openid_plugin.c File Reference

#include "platform.h"
#include <inttypes.h>
#include <jansson.h>
#include <jose/jose.h>
#include "gnunet_util_lib.h"
#include "gnunet_gns_service.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_identity_service.h"
#include "gnunet_reclaim_lib.h"
#include "gnunet_reclaim_service.h"
#include "gnunet_rest_lib.h"
#include "gnunet_rest_plugin.h"
#include "microhttpd.h"
#include "oidc_helper.h"
#include "openid_plugin.h"

Include dependency graph for openid_plugin.c:

Go to the source code of this file.

Data Structures
struct	Plugin
	Handle for a plugin. More...
struct	OIDC_Variables
	OIDC needed variables. More...
struct	EgoEntry
	The default namestore ego. More...
struct	RequestHandle
	The request handle. More...

Macros
#define	GNUNET_REST_API_NS_OIDC   "/openid"
	REST root namespace.
#define	GNUNET_REST_API_NS_OIDC_CONFIG   "/.well-known/openid-configuration"
	OIDC config.
#define	GNUNET_REST_API_NS_AUTHORIZE   "/openid/authorize"
	Authorize endpoint.
#define	GNUNET_REST_API_NS_TOKEN   "/openid/token"
	Token endpoint.
#define	GNUNET_REST_API_JWKS   "/jwks.json"
	JSON Web Keys endpoint.
#define	GNUNET_REST_API_NS_USERINFO   "/openid/userinfo"
	UserInfo endpoint.
#define	GNUNET_REST_API_NS_LOGIN   "/openid/login"
	Login namespace.
#define	ID_REST_STATE_INIT   0
	State while collecting all egos.
#define	ID_REST_STATE_POST_INIT   1
	Done collecting egos.
#define	OIDC_GRANT_TYPE_KEY   "grant_type"
	OIDC grant_type key.
#define	OIDC_GRANT_TYPE_VALUE   "authorization_code"
	OIDC grant_type key.
#define	OIDC_CODE_KEY   "code"
	OIDC code key.
#define	OIDC_RESPONSE_TYPE_KEY   "response_type"
	OIDC response_type key.
#define	OIDC_CLIENT_ID_KEY   "client_id"
	OIDC client_id key.
#define	OIDC_SCOPE_KEY   "scope"
	OIDC scope key.
#define	OIDC_REDIRECT_URI_KEY   "redirect_uri"
	OIDC redirect_uri key.
#define	OIDC_STATE_KEY   "state"
	OIDC state key.
#define	OIDC_NONCE_KEY   "nonce"
	OIDC nonce key.
#define	OIDC_CLAIMS_KEY   "claims"
	OIDC claims key.
#define	OIDC_CODE_CHALLENGE_KEY   "code_challenge"
	OIDC PKCE code challenge.
#define	OIDC_CODE_VERIFIER_KEY   "code_verifier"
	OIDC PKCE code verifier.
#define	OIDC_COOKIE_EXPIRATION   3
	OIDC cookie expiration (in seconds)
#define	OIDC_COOKIE_HEADER_KEY   "cookie"
	OIDC cookie header key.
#define	OIDC_AUTHORIZATION_HEADER_KEY   "authorization"
	OIDC cookie header information key.
#define	OIDC_COOKIE_HEADER_INFORMATION_KEY   "Identity="
	OIDC cookie header information key.
#define	OIDC_COOKIE_HEADER_ACCESS_DENIED   "Identity=Denied"
	OIDC cookie header if user cancelled.
#define	OIDC_EXPECTED_AUTHORIZATION_RESPONSE_TYPE   "code"
	OIDC expected response_type while authorizing.
#define	OIDC_EXPECTED_AUTHORIZATION_SCOPE   "openid"
	OIDC expected scope part while authorizing.
#define	OIDC_ERROR_KEY_INVALID_CLIENT   "invalid_client"
	OIDC error key for invalid client.
#define	OIDC_ERROR_KEY_INVALID_SCOPE   "invalid_scope"
	OIDC error key for invalid scopes.
#define	OIDC_ERROR_KEY_INVALID_REQUEST   "invalid_request"
	OIDC error key for invalid requests.
#define	OIDC_ERROR_KEY_INVALID_TOKEN   "invalid_token"
	OIDC error key for invalid tokens.
#define	OIDC_ERROR_KEY_INVALID_COOKIE   "invalid_cookie"
	OIDC error key for invalid cookies.
#define	OIDC_ERROR_KEY_SERVER_ERROR   "server_error"
	OIDC error key for generic server errors.
#define	OIDC_ERROR_KEY_UNSUPPORTED_GRANT_TYPE   "unsupported_grant_type"
	OIDC error key for unsupported grants.
#define	OIDC_ERROR_KEY_UNSUPPORTED_RESPONSE_TYPE   "unsupported_response_type"
	OIDC error key for unsupported response types.
#define	OIDC_ERROR_KEY_UNAUTHORIZED_CLIENT   "unauthorized_client"
	OIDC error key for unauthorized clients.
#define	OIDC_ERROR_KEY_ACCESS_DENIED   "access_denied"
	OIDC error key for denied access.
#define	OIDC_JWK_RSA_FILENAME   "jwk_rsa.json"
	OIDC key store file name.
#define	CONSUME_TIMEOUT
	How long to wait for a consume in userinfo endpoint.

Functions
static void	cleanup_handle (struct RequestHandle *handle)
	Cleanup lookup handle.
static void	do_error (void *cls)
	Task run on error, sends error message.
static void	do_userinfo_error (void *cls)
	Task run on error in userinfo endpoint, sends error header.
static void	do_redirect_error (void *cls)
	Task run on error, sends error message and redirects.
static void	do_timeout (void *cls)
	Task run on timeout, sends error message.
static void	options_cont (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
	Respond to OPTIONS request.
static void	cookie_identity_interpretation (struct RequestHandle *handle)
	Interprets cookie header and pass its identity keystring to handle.
static json_t *	read_jwk_from_file (const char *filename)
	Read the the JSON Web Key in the given file and return it.
static int	write_jwk_to_file (const char *filename, json_t *jwk)
	Write the JWK to file.
static json_t *	generate_jwk ()
	Generate a new RSA JSON Web Key.
static char *	get_oidc_dir_path (void *cls)
	Return the path to the oidc directory path.
static char *	get_oidc_jwk_path (void *cls)
	Return the path to the RSA JWK key file.
static void	login_redirect (void *cls)
	Redirects to login page stored in configuration file.
static void	oidc_iteration_error (void *cls)
	Does internal server error when iteration failed.
static void	oidc_ticket_issue_cb (void *cls, const struct GNUNET_RECLAIM_Ticket *ticket, const struct GNUNET_RECLAIM_PresentationList *presentation)
	Issues ticket and redirects to relying party with the authorization code as parameter.
static struct GNUNET_RECLAIM_AttributeList *	attribute_list_merge (struct GNUNET_RECLAIM_AttributeList *list_a, struct GNUNET_RECLAIM_AttributeList *list_b)
static void	oidc_cred_collect_finished_cb (void *cls)
static void	oidc_cred_collect (void *cls, const struct GNUNET_CRYPTO_BlindablePublicKey *identity, const struct GNUNET_RECLAIM_Credential *cred)
	Collects all attributes for an ego if in scope parameter.
static void	oidc_attr_collect_finished_cb (void *cls)
static int	attr_in_claims_request (struct RequestHandle *handle, const char *attr_name, const char *claims_parameter)
static int	attr_in_idtoken_request (struct RequestHandle *handle, const char *attr_name)
static int	attr_in_userinfo_request (struct RequestHandle *handle, const char *attr_name)
static void	oidc_attr_collect (void *cls, const struct GNUNET_CRYPTO_BlindablePublicKey *identity, const struct GNUNET_RECLAIM_Attribute *attr)
	Collects all attributes for an ego if in scope parameter.
static void	code_redirect (void *cls)
	Checks time and cookie and redirects accordingly.
static void	build_redirect (void *cls)
static void	lookup_redirect_uri_result (void *cls, uint32_t rd_count, const struct GNUNET_GNSRECORD_Data *rd)
static void	client_redirect (void *cls)
	Initiate redirect back to client.
static char *	get_url_parameter_copy (const struct RequestHandle *handle, const char *key)
static void	build_authz_response (void *cls)
	Iteration over all results finished, build final response.
static void	tld_iter (void *cls, const char *section, const char *option, const char *value)
	Iterate over tlds in config.
static void	authorize_endpoint (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
	Responds to authorization GET and url-encoded POST request.
static void	login_cont (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
	Combines an identity with a login time and responds OK to login request.
static int	parse_credentials_basic_auth (struct RequestHandle *handle, char **client_id, char **client_secret)
static int	parse_credentials_post_body (struct RequestHandle *handle, char **client_id, char **client_secret)
static int	check_authorization (struct RequestHandle *handle, struct GNUNET_CRYPTO_BlindablePublicKey *cid)
static const struct EgoEntry *	find_ego (struct RequestHandle *handle, struct GNUNET_CRYPTO_BlindablePublicKey *test_key)
static void	token_endpoint (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
	Responds to token url-encoded POST request.
static void	consume_ticket (void *cls, const struct GNUNET_CRYPTO_BlindablePublicKey *identity, const struct GNUNET_RECLAIM_Attribute *attr, const struct GNUNET_RECLAIM_Presentation *presentation)
	Collects claims and stores them in handle.
static void	consume_fail (void *cls)
static void	userinfo_endpoint (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
	Responds to userinfo GET and url-encoded POST request.
static void	jwks_endpoint (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
	Responds to /jwks.json.
static void	list_ego (void *cls, struct GNUNET_IDENTITY_Ego *ego, void **ctx, const char *identifier)
	If listing is enabled, prints information about the egos.
static void	oidc_config_endpoint (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
static void	oidc_config_cors (struct GNUNET_REST_RequestHandle *con_handle, const char *url, void *cls)
	Respond to OPTIONS request.
enum GNUNET_GenericReturnValue	REST_openid_process_request (void *plugin, struct GNUNET_REST_RequestHandle *rest_handle, GNUNET_REST_ResultProcessor proc, void *proc_cls)
	Function processing the REST call.
void *	REST_openid_init (const struct GNUNET_CONFIGURATION_Handle *c)
	Entry point for the plugin.
static int	cleanup_hashmap (void *cls, const struct GNUNET_HashCode *key, void *value)
void	REST_openid_done (struct GNUNET_REST_Plugin *api)
	Exit point from the plugin.

Variables
static const char *	OIDC_ignored_parameter_array []
	OIDC ignored parameter array.
struct GNUNET_CONTAINER_MultiHashMap *	oidc_code_cache
	OIDC hashmap for cached access tokens and codes.
struct GNUNET_CONTAINER_MultiHashMap *	OIDC_cookie_jar_map
	OIDC hashmap that keeps track of issued cookies.
const struct GNUNET_CONFIGURATION_Handle *	oid_cfg
	The configuration handle.
static char *	allow_methods
	HTTP methods allows for this plugin.
static struct EgoEntry *	ego_head
	Ego list.
static struct EgoEntry *	ego_tail
	Ego list.
static int	state
	The processing state.
static struct GNUNET_IDENTITY_Handle *	identity_handle
	Handle to Identity service.
static struct GNUNET_GNS_Handle *	gns_handle
	GNS handle.
static struct GNUNET_RECLAIM_Handle *	idp
	Identity Provider.
static struct GNUNET_TIME_Relative	consume_timeout
	Timeout for consume call on userinfo.
json_t *	oidc_jwk
	The RSA key used by the oidc endpoint.
static struct RequestHandle *	requests_head
	DLL.
static struct RequestHandle *	requests_tail
	DLL.

Macro Definition Documentation

GNUNET_REST_API_NS_OIDC

#define GNUNET_REST_API_NS_OIDC   "/openid"

REST root namespace.

Definition at line 48 of file openid_plugin.c.

GNUNET_REST_API_NS_OIDC_CONFIG

#define GNUNET_REST_API_NS_OIDC_CONFIG   "/.well-known/openid-configuration"

OIDC config.

Definition at line 53 of file openid_plugin.c.

GNUNET_REST_API_NS_AUTHORIZE

#define GNUNET_REST_API_NS_AUTHORIZE   "/openid/authorize"

Authorize endpoint.

Definition at line 58 of file openid_plugin.c.

GNUNET_REST_API_NS_TOKEN

#define GNUNET_REST_API_NS_TOKEN   "/openid/token"

Token endpoint.

Definition at line 63 of file openid_plugin.c.

GNUNET_REST_API_JWKS

#define GNUNET_REST_API_JWKS   "/jwks.json"

JSON Web Keys endpoint.

Definition at line 68 of file openid_plugin.c.

GNUNET_REST_API_NS_USERINFO

#define GNUNET_REST_API_NS_USERINFO   "/openid/userinfo"

UserInfo endpoint.

Definition at line 73 of file openid_plugin.c.

GNUNET_REST_API_NS_LOGIN

#define GNUNET_REST_API_NS_LOGIN   "/openid/login"

Login namespace.

Definition at line 78 of file openid_plugin.c.

ID_REST_STATE_INIT

#define ID_REST_STATE_INIT   0

State while collecting all egos.

Definition at line 83 of file openid_plugin.c.

ID_REST_STATE_POST_INIT

#define ID_REST_STATE_POST_INIT   1

Done collecting egos.

Definition at line 88 of file openid_plugin.c.

OIDC_GRANT_TYPE_KEY

#define OIDC_GRANT_TYPE_KEY   "grant_type"

OIDC grant_type key.

Definition at line 93 of file openid_plugin.c.

OIDC_GRANT_TYPE_VALUE

#define OIDC_GRANT_TYPE_VALUE   "authorization_code"

OIDC grant_type key.

Definition at line 98 of file openid_plugin.c.

OIDC_CODE_KEY

#define OIDC_CODE_KEY   "code"

OIDC code key.

Definition at line 103 of file openid_plugin.c.

OIDC_RESPONSE_TYPE_KEY

#define OIDC_RESPONSE_TYPE_KEY   "response_type"

OIDC response_type key.

Definition at line 108 of file openid_plugin.c.

OIDC_CLIENT_ID_KEY

#define OIDC_CLIENT_ID_KEY   "client_id"

OIDC client_id key.

Definition at line 113 of file openid_plugin.c.

OIDC_SCOPE_KEY

#define OIDC_SCOPE_KEY   "scope"

OIDC scope key.

Definition at line 118 of file openid_plugin.c.

OIDC_REDIRECT_URI_KEY

#define OIDC_REDIRECT_URI_KEY   "redirect_uri"

OIDC redirect_uri key.

Definition at line 123 of file openid_plugin.c.

OIDC_STATE_KEY

#define OIDC_STATE_KEY   "state"

OIDC state key.

Definition at line 128 of file openid_plugin.c.

OIDC_NONCE_KEY

#define OIDC_NONCE_KEY   "nonce"

OIDC nonce key.

Definition at line 133 of file openid_plugin.c.

OIDC_CLAIMS_KEY

#define OIDC_CLAIMS_KEY   "claims"

OIDC claims key.

Definition at line 138 of file openid_plugin.c.

OIDC_CODE_CHALLENGE_KEY

#define OIDC_CODE_CHALLENGE_KEY   "code_challenge"

OIDC PKCE code challenge.

Definition at line 143 of file openid_plugin.c.

OIDC_CODE_VERIFIER_KEY

#define OIDC_CODE_VERIFIER_KEY   "code_verifier"

OIDC PKCE code verifier.

Definition at line 148 of file openid_plugin.c.

OIDC_COOKIE_EXPIRATION

#define OIDC_COOKIE_EXPIRATION   3

OIDC cookie expiration (in seconds)

Definition at line 153 of file openid_plugin.c.

OIDC_COOKIE_HEADER_KEY

#define OIDC_COOKIE_HEADER_KEY   "cookie"

OIDC cookie header key.

Definition at line 158 of file openid_plugin.c.

OIDC_AUTHORIZATION_HEADER_KEY

#define OIDC_AUTHORIZATION_HEADER_KEY   "authorization"

OIDC cookie header information key.

Definition at line 163 of file openid_plugin.c.

OIDC_COOKIE_HEADER_INFORMATION_KEY

#define OIDC_COOKIE_HEADER_INFORMATION_KEY   "Identity="

OIDC cookie header information key.

Definition at line 168 of file openid_plugin.c.

OIDC_COOKIE_HEADER_ACCESS_DENIED

#define OIDC_COOKIE_HEADER_ACCESS_DENIED   "Identity=Denied"

OIDC cookie header if user cancelled.

Definition at line 173 of file openid_plugin.c.

OIDC_EXPECTED_AUTHORIZATION_RESPONSE_TYPE

#define OIDC_EXPECTED_AUTHORIZATION_RESPONSE_TYPE   "code"

OIDC expected response_type while authorizing.

Definition at line 178 of file openid_plugin.c.

OIDC_EXPECTED_AUTHORIZATION_SCOPE

#define OIDC_EXPECTED_AUTHORIZATION_SCOPE   "openid"

OIDC expected scope part while authorizing.

Definition at line 183 of file openid_plugin.c.

OIDC_ERROR_KEY_INVALID_CLIENT

#define OIDC_ERROR_KEY_INVALID_CLIENT   "invalid_client"

OIDC error key for invalid client.

Definition at line 188 of file openid_plugin.c.

OIDC_ERROR_KEY_INVALID_SCOPE

#define OIDC_ERROR_KEY_INVALID_SCOPE   "invalid_scope"

OIDC error key for invalid scopes.

Definition at line 193 of file openid_plugin.c.

OIDC_ERROR_KEY_INVALID_REQUEST

#define OIDC_ERROR_KEY_INVALID_REQUEST   "invalid_request"

OIDC error key for invalid requests.

Definition at line 198 of file openid_plugin.c.

OIDC_ERROR_KEY_INVALID_TOKEN

#define OIDC_ERROR_KEY_INVALID_TOKEN   "invalid_token"

OIDC error key for invalid tokens.

Definition at line 203 of file openid_plugin.c.

OIDC_ERROR_KEY_INVALID_COOKIE

#define OIDC_ERROR_KEY_INVALID_COOKIE   "invalid_cookie"

OIDC error key for invalid cookies.

Definition at line 208 of file openid_plugin.c.

OIDC_ERROR_KEY_SERVER_ERROR

#define OIDC_ERROR_KEY_SERVER_ERROR   "server_error"

OIDC error key for generic server errors.

Definition at line 213 of file openid_plugin.c.

OIDC_ERROR_KEY_UNSUPPORTED_GRANT_TYPE

#define OIDC_ERROR_KEY_UNSUPPORTED_GRANT_TYPE   "unsupported_grant_type"

OIDC error key for unsupported grants.

Definition at line 218 of file openid_plugin.c.

OIDC_ERROR_KEY_UNSUPPORTED_RESPONSE_TYPE

#define OIDC_ERROR_KEY_UNSUPPORTED_RESPONSE_TYPE   "unsupported_response_type"

OIDC error key for unsupported response types.

Definition at line 223 of file openid_plugin.c.

OIDC_ERROR_KEY_UNAUTHORIZED_CLIENT

#define OIDC_ERROR_KEY_UNAUTHORIZED_CLIENT   "unauthorized_client"

OIDC error key for unauthorized clients.

Definition at line 228 of file openid_plugin.c.

OIDC_ERROR_KEY_ACCESS_DENIED

#define OIDC_ERROR_KEY_ACCESS_DENIED   "access_denied"

OIDC error key for denied access.

Definition at line 233 of file openid_plugin.c.

OIDC_JWK_RSA_FILENAME

#define OIDC_JWK_RSA_FILENAME   "jwk_rsa.json"

OIDC key store file name.

Definition at line 238 of file openid_plugin.c.

CONSUME_TIMEOUT

#define CONSUME_TIMEOUT

Value:

          GNUNET_TIME_relative_multiply ( \
          GNUNET_TIME_UNIT_SECONDS,2)

How long to wait for a consume in userinfo endpoint.

Definition at line 243 of file openid_plugin.c.

                                                    { "display",
                                                      "prompt",
                                                      "ui_locales",
                                                      "response_mode",
                                                      "id_token_hint",
                                                      "login_hint",
                                                      "acr_values" };
 
struct GNUNET_CONTAINER_MultiHashMap *oidc_code_cache;
 
struct GNUNET_CONTAINER_MultiHashMap *OIDC_cookie_jar_map;
 
const struct GNUNET_CONFIGURATION_Handle *oid_cfg;
 
static char *allow_methods;
 
static struct EgoEntry *ego_head;
 
static struct EgoEntry *ego_tail;
 
static int state;
 
static struct GNUNET_IDENTITY_Handle *identity_handle;
 
static struct GNUNET_GNS_Handle *gns_handle;
 
static struct GNUNET_RECLAIM_Handle *idp;
 
static struct GNUNET_TIME_Relative consume_timeout;
 
struct Plugin
{
  const struct GNUNET_CONFIGURATION_Handle *cfg;
};
 
json_t *oidc_jwk;
 
struct OIDC_Variables
{
  struct GNUNET_CRYPTO_BlindablePublicKey client_pkey;
 
  char *client_id;
 
  char *redirect_uri;
 
  char *scope;
 
  char *state;
 
  char *nonce;
 
  char *claims;
 
  char *response_type;
 
  char *login_identity;
 
  int user_cancelled;
 
  char *code_challenge;
 
  char *code_verifier;
 
};
 
struct EgoEntry
{
  struct EgoEntry *next;
 
  struct EgoEntry *prev;
 
  char *identifier;
 
  char *keystring;
 
  struct GNUNET_IDENTITY_Ego *ego;
};
 
 
struct RequestHandle
{
  struct RequestHandle *next;
 
  struct RequestHandle *prev;
 
  struct EgoEntry *ego_entry;
 
  struct GNUNET_CRYPTO_BlindablePrivateKey priv_key;
 
  struct OIDC_Variables *oidc;
 
  struct GNUNET_GNS_LookupRequest *gns_op;
 
  struct GNUNET_REST_RequestHandle *rest_handle;
 
  struct GNUNET_RECLAIM_AttributeList *attr_idtoken_list;
 
  struct GNUNET_RECLAIM_AttributeList *attr_userinfo_list;
 
  struct GNUNET_RECLAIM_CredentialList *credentials;
 
  struct GNUNET_RECLAIM_PresentationList *presentations;
 
  struct GNUNET_IDENTITY_Operation *op;
 
 
  struct GNUNET_RECLAIM_Operation *idp_op;
 
  struct GNUNET_SCHEDULER_Task *consume_timeout_op;
 
  struct GNUNET_RECLAIM_AttributeIterator *attr_it;
 
  struct GNUNET_RECLAIM_CredentialIterator *cred_it;
 
 
  struct GNUNET_RECLAIM_TicketIterator *ticket_it;
 
  struct GNUNET_RECLAIM_Ticket ticket;
 
  struct GNUNET_TIME_Relative timeout;
 
  struct GNUNET_SCHEDULER_Task *timeout_task;
 
  GNUNET_REST_ResultProcessor proc;
 
  void *proc_cls;
 
  char *url;
 
  char *access_token;
 
  char *tld;
 
  char *redirect_prefix;
 
  char *redirect_suffix;
 
  char *emsg;
 
  char *edesc;
 
  int response_code;
 
  int public_client;
};
 
static struct RequestHandle *requests_head;
 
static struct RequestHandle *requests_tail;
 
 
static void
cleanup_handle (struct RequestHandle *handle)
{
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Cleaning up\n");
  if (NULL != handle->timeout_task)
    GNUNET_SCHEDULER_cancel (handle->timeout_task);
  if (NULL != handle->attr_it)
    GNUNET_RECLAIM_get_attributes_stop (handle->attr_it);
  if (NULL != handle->cred_it)
    GNUNET_RECLAIM_get_credentials_stop (handle->cred_it);
  if (NULL != handle->ticket_it)
    GNUNET_RECLAIM_ticket_iteration_stop (handle->ticket_it);
  if (NULL != handle->idp_op)
    GNUNET_RECLAIM_cancel (handle->idp_op);
  if (NULL != handle->consume_timeout_op)
    GNUNET_SCHEDULER_cancel (handle->consume_timeout_op);
  GNUNET_free (handle->url);
  GNUNET_free (handle->tld);
  GNUNET_free (handle->redirect_prefix);
  GNUNET_free (handle->redirect_suffix);
  GNUNET_free (handle->emsg);
  GNUNET_free (handle->edesc);
  if (NULL != handle->gns_op)
    GNUNET_GNS_lookup_cancel (handle->gns_op);
  if (NULL != handle->oidc)
  {
    GNUNET_free (handle->oidc->client_id);
    GNUNET_free (handle->oidc->login_identity);
    GNUNET_free (handle->oidc->nonce);
    GNUNET_free (handle->oidc->redirect_uri);
    GNUNET_free (handle->oidc->response_type);
    GNUNET_free (handle->oidc->scope);
    GNUNET_free (handle->oidc->state);
    if (NULL != handle->oidc->claims)
      GNUNET_free (handle->oidc->claims);
    if (NULL != handle->oidc->code_challenge)
      GNUNET_free (handle->oidc->code_challenge);
    GNUNET_free (handle->oidc);
  }
  if (NULL!=handle->attr_idtoken_list)
    GNUNET_RECLAIM_attribute_list_destroy (handle->attr_idtoken_list);
  if (NULL!=handle->attr_userinfo_list)
    GNUNET_RECLAIM_attribute_list_destroy (handle->attr_userinfo_list);
  if (NULL!=handle->credentials)
    GNUNET_RECLAIM_credential_list_destroy (handle->credentials);
  if (NULL!=handle->presentations)
    GNUNET_RECLAIM_presentation_list_destroy (handle->presentations);
  GNUNET_CONTAINER_DLL_remove (requests_head,
                               requests_tail,
                               handle);
  if (NULL != handle->access_token)
    GNUNET_free (handle->access_token);
  GNUNET_free (handle);
}
 
 
static void
do_error (void *cls)
{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *json_error;
 
  GNUNET_asprintf (&json_error,
                   "{ \"error\" : \"%s\", \"error_description\" : \"%s\"%s%s%s}",
                   handle->emsg,
                   (NULL != handle->edesc) ? handle->edesc : "",
                   (NULL != handle->oidc->state) ? ", \"state\":\"" : "",
                   (NULL != handle->oidc->state) ? handle->oidc->state : "",
                   (NULL != handle->oidc->state) ? "\"" : "");
  if (0 == handle->response_code)
    handle->response_code = MHD_HTTP_BAD_REQUEST;
  resp = GNUNET_REST_create_response (json_error);
  if (MHD_HTTP_UNAUTHORIZED == handle->response_code)
    GNUNET_assert (MHD_NO !=
                   MHD_add_response_header (resp,
                                            MHD_HTTP_HEADER_WWW_AUTHENTICATE,
                                            "Basic"));
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    MHD_HTTP_HEADER_CONTENT_TYPE,
                                                    "application/json"));
  handle->proc (handle->proc_cls, resp, handle->response_code);
  cleanup_handle (handle);
  GNUNET_free (json_error);
}
 
 
static void
do_userinfo_error (void *cls)
{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *error;
 
  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
              "Error: %s\n", handle->edesc);
  GNUNET_asprintf (&error,
                   "error=\"%s\", error_description=\"%s\"",
                   handle->emsg,
                   (NULL != handle->edesc) ? handle->edesc : "");
  resp = GNUNET_REST_create_response ("");
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          MHD_HTTP_HEADER_WWW_AUTHENTICATE,
                                          "Bearer"));
  handle->proc (handle->proc_cls, resp, handle->response_code);
  cleanup_handle (handle);
  GNUNET_free (error);
}
 
 
static void
do_redirect_error (void *cls)
{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *redirect;
 
  GNUNET_asprintf (&redirect,
                   "%s?error=%s&error_description=%s%s%s",
                   handle->oidc->redirect_uri,
                   handle->emsg,
                   handle->edesc,
                   (NULL != handle->oidc->state) ? "&state=" : "",
                   (NULL != handle->oidc->state) ? handle->oidc->state : "");
  resp = GNUNET_REST_create_response ("");
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Location", redirect));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
  cleanup_handle (handle);
  GNUNET_free (redirect);
}
 
 
static void
do_timeout (void *cls)
{
  struct RequestHandle *handle = cls;
 
  handle->timeout_task = NULL;
  do_error (handle);
}
 
 
static void
options_cont (struct GNUNET_REST_RequestHandle *con_handle,
              const char *url,
              void *cls)
{
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  // For now, independent of path return all options
  resp = GNUNET_REST_create_response (NULL);
  MHD_add_response_header (resp, "Access-Control-Allow-Methods", allow_methods);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  cleanup_handle (handle);
  return;
}
 
 
static void
cookie_identity_interpretation (struct RequestHandle *handle)
{
  struct GNUNET_HashCode cache_key;
  char *cookies;
  struct GNUNET_TIME_Absolute current_time, *relog_time;
  char delimiter[] = "; ";
  char *tmp_cookies;
  char *token;
  char *value;
 
  // gets identity of login try with cookie
  GNUNET_CRYPTO_hash (OIDC_COOKIE_HEADER_KEY,
                      strlen (OIDC_COOKIE_HEADER_KEY),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->header_param_map,
                                                           &cache_key))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No cookie found\n");
    return;
  }
  // splits cookies and find 'Identity' cookie
  tmp_cookies =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->header_param_map,
                                       &cache_key);
  cookies = GNUNET_strdup (tmp_cookies);
  token = strtok (cookies, delimiter);
  handle->oidc->user_cancelled = GNUNET_NO;
  handle->oidc->login_identity = NULL;
  if (NULL == token)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unable to parse cookie: %s\n",
                cookies);
    GNUNET_free (cookies);
    return;
  }
 
  while (NULL != token)
  {
    if (0 == strcmp (token, OIDC_COOKIE_HEADER_ACCESS_DENIED))
    {
      handle->oidc->user_cancelled = GNUNET_YES;
      GNUNET_free (cookies);
      return;
    }
    if (NULL != strstr (token, OIDC_COOKIE_HEADER_INFORMATION_KEY))
      break;
    token = strtok (NULL, delimiter);
  }
  if (NULL == token)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "No cookie value to process: %s\n",
                cookies);
    GNUNET_free (cookies);
    return;
  }
  GNUNET_CRYPTO_hash (token, strlen (token), &cache_key);
  if (GNUNET_NO ==
      GNUNET_CONTAINER_multihashmap_contains (OIDC_cookie_jar_map, &cache_key))
  {
    GNUNET_log (
      GNUNET_ERROR_TYPE_WARNING,
      "Found cookie `%s', but no corresponding expiration entry present...\n",
      token);
    GNUNET_free (cookies);
    return;
  }
  relog_time =
    GNUNET_CONTAINER_multihashmap_get (OIDC_cookie_jar_map, &cache_key);
  current_time = GNUNET_TIME_absolute_get ();
  // 30 min after old login -> redirect to login
  if (current_time.abs_value_us > relog_time->abs_value_us)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Found cookie `%s', but it is expired.\n",
                token);
    GNUNET_free (cookies);
    return;
  }
  value = strtok (token, OIDC_COOKIE_HEADER_INFORMATION_KEY);
  GNUNET_assert (NULL != value);
  handle->oidc->login_identity = GNUNET_strdup (value);
  GNUNET_free (cookies);
}
 
 
static json_t *
read_jwk_from_file (const char *filename)
{
  json_t *jwk;
  json_error_t error;
 
  jwk = json_load_file (filename, JSON_DECODE_ANY, &error);
 
  if (! jwk)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                ("Could not read OIDC RSA key from config file; %s\n"),
                error.text);
  }
 
  return jwk;
}
 
 
static int
write_jwk_to_file (const char *filename,
                   json_t *jwk)
{
  if (json_dump_file (jwk, filename, JSON_INDENT (2)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                ("Could not write OIDC RSA key to file %s\n"),
                filename);
    return GNUNET_ERROR_TYPE_WARNING;
  }
  else
    return GNUNET_OK;
}
 
 
static json_t *
generate_jwk ()
{
  json_t *jwk;
  jwk = json_pack ("{s:s,s:i}", "kty", "RSA", "bits", 2048);
  jose_jwk_gen (NULL, jwk);
  json_incref (jwk);
  return jwk;
}
 
 
static char *
get_oidc_dir_path (void *cls)
{
  char *oidc_directory;
  struct RequestHandle *handle = cls;
 
  // Read OIDC directory from config
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (oid_cfg,
                                                            "reclaim-rest-plugin",
                                                            "oidc_dir",
                                                            &oidc_directory))
  {
    // Could not read Config file
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return NULL;
  }
 
  return oidc_directory;
}
 
 
static char *
get_oidc_jwk_path (void *cls)
{
  char *oidc_directory;
  char *oidc_jwk_path;
 
  oidc_directory = get_oidc_dir_path (cls);
 
  // Create path to file
  GNUNET_asprintf (&oidc_jwk_path, "%s/%s", oidc_directory,
                   OIDC_JWK_RSA_FILENAME);
 
  return oidc_jwk_path;
}
 
 
static void
login_redirect (void *cls)
{
  char *login_base_url;
  char *new_redirect;
  char *tmp;
  struct MHD_Response *resp;
  struct GNUNET_Buffer buf = { 0 };
  struct RequestHandle *handle = cls;
 
  if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                          "reclaim-rest-plugin",
                                                          "address",
                                                          &login_base_url))
  {
    GNUNET_buffer_write_str (&buf, login_base_url);
    GNUNET_buffer_write_fstr (&buf,
                              "?%s=%s",
                              OIDC_RESPONSE_TYPE_KEY,
                              handle->oidc->response_type);
    GNUNET_buffer_write_fstr (&buf,
                              "&%s=%s",
                              OIDC_CLIENT_ID_KEY,
                              handle->oidc->client_id);
    GNUNET_STRINGS_urlencode (strlen (handle->oidc->redirect_uri),
                              handle->oidc->redirect_uri,
                              &tmp);
    GNUNET_buffer_write_fstr (&buf,
                              "&%s=%s",
                              OIDC_REDIRECT_URI_KEY,
                              tmp);
    GNUNET_free (tmp);
    GNUNET_STRINGS_urlencode (strlen (handle->oidc->scope),
                              handle->oidc->scope,
                              &tmp);
    GNUNET_buffer_write_fstr (&buf,
                              "&%s=%s",
                              OIDC_SCOPE_KEY,
                              tmp);
    GNUNET_free (tmp);
    if (NULL != handle->oidc->state)
    {
      GNUNET_STRINGS_urlencode (strlen (handle->oidc->state),
                                handle->oidc->state,
                                &tmp);
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_STATE_KEY,
                                handle->oidc->state);
      GNUNET_free (tmp);
    }
    if (NULL != handle->oidc->code_challenge)
    {
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_CODE_CHALLENGE_KEY,
                                handle->oidc->code_challenge);
    }
    if (NULL != handle->oidc->nonce)
    {
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_NONCE_KEY,
                                handle->oidc->nonce);
    }
    if (NULL != handle->oidc->claims)
    {
      GNUNET_STRINGS_urlencode (strlen (handle->oidc->claims),
                                handle->oidc->claims,
                                &tmp);
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_CLAIMS_KEY,
                                tmp);
      GNUNET_free (tmp);
    }
    new_redirect = GNUNET_buffer_reap_str (&buf);
    resp = GNUNET_REST_create_response ("");
    MHD_add_response_header (resp, "Location", new_redirect);
    GNUNET_free (login_base_url);
  }
  else
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
  GNUNET_free (new_redirect);
  cleanup_handle (handle);
}
 
 
static void
oidc_iteration_error (void *cls)
{
  struct RequestHandle *handle = cls;
 
  handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
  handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
  GNUNET_SCHEDULER_add_now (&do_error, handle);
}
 
 
static void
oidc_ticket_issue_cb (void *cls,
                      const struct GNUNET_RECLAIM_Ticket *ticket,
                      const struct
                      GNUNET_RECLAIM_PresentationList *presentation)
{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *ticket_str;
  char *redirect_uri;
  char *code_string;
 
  handle->idp_op = NULL;
  if (NULL == ticket)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("Server cannot generate ticket.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
  handle->ticket = *ticket;
  ticket_str =
    GNUNET_STRINGS_data_to_string_alloc (&handle->ticket,
                                         sizeof(struct GNUNET_RECLAIM_Ticket));
  code_string = OIDC_build_authz_code (&handle->priv_key,
                                       &handle->ticket,
                                       handle->attr_idtoken_list,
                                       presentation,
                                       handle->oidc->nonce,
                                       handle->oidc->code_challenge);
  if ((NULL != handle->redirect_prefix) && (NULL != handle->redirect_suffix) &&
      (NULL != handle->tld))
  {
    GNUNET_asprintf (&redirect_uri,
                     "%s.%s/%s%s%s=%s&state=%s",
                     handle->redirect_prefix,
                     handle->tld,
                     handle->redirect_suffix,
                     (NULL == strchr (handle->redirect_suffix, '?') ? "?" :
                      "&"),
                     handle->oidc->response_type,
                     code_string,
                     handle->oidc->state);
  }
  else
  {
    GNUNET_asprintf (&redirect_uri,
                     "%s%s%s=%s&state=%s",
                     handle->oidc->redirect_uri,
                     (NULL == strchr (handle->oidc->redirect_uri, '?') ? "?" :
                      "&"),
                     handle->oidc->response_type,
                     code_string,
                     handle->oidc->state);
  }
  resp = GNUNET_REST_create_response ("");
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Location", redirect_uri));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
  cleanup_handle (handle);
  GNUNET_free (redirect_uri);
  GNUNET_free (ticket_str);
  GNUNET_free (code_string);
}
 
 
static struct GNUNET_RECLAIM_AttributeList*
attribute_list_merge (struct GNUNET_RECLAIM_AttributeList *list_a,
                      struct GNUNET_RECLAIM_AttributeList *list_b)
{
  struct GNUNET_RECLAIM_AttributeList *merged_list;
  struct GNUNET_RECLAIM_AttributeListEntry *le_a;
  struct GNUNET_RECLAIM_AttributeListEntry *le_b;
  struct GNUNET_RECLAIM_AttributeListEntry *le_m;
 
  merged_list = GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
  for (le_a = list_a->list_head; NULL != le_a; le_a = le_a->next)
  {
    le_m = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le_m->attribute = GNUNET_RECLAIM_attribute_new (le_a->attribute->name,
                                                    &le_a->attribute->
                                                    credential,
                                                    le_a->attribute->type,
                                                    le_a->attribute->data,
                                                    le_a->attribute->data_size);
    le_m->attribute->id = le_a->attribute->id;
    le_m->attribute->flag = le_a->attribute->flag;
    le_m->attribute->credential = le_a->attribute->credential;
    GNUNET_CONTAINER_DLL_insert (merged_list->list_head,
                                 merged_list->list_tail,
                                 le_m);
  }
  le_m = NULL;
  for (le_b = list_b->list_head; NULL != le_b; le_b = le_b->next)
  {
    for (le_m = merged_list->list_head; NULL != le_m; le_m = le_m->next)
    {
      if (GNUNET_YES == GNUNET_RECLAIM_id_is_equal (&le_m->attribute->id,
                                                    &le_b->attribute->id))
        break; 
    }
    if (NULL != le_m)
      continue; 
    le_m = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le_m->attribute = GNUNET_RECLAIM_attribute_new (le_b->attribute->name,
                                                    &le_b->attribute->
                                                    credential,
                                                    le_b->attribute->type,
                                                    le_b->attribute->data,
                                                    le_b->attribute->data_size);
    le_m->attribute->id = le_b->attribute->id;
    le_m->attribute->flag = le_b->attribute->flag;
    le_m->attribute->credential = le_b->attribute->credential;
    GNUNET_CONTAINER_DLL_insert (merged_list->list_head,
                                 merged_list->list_tail,
                                 le_m);
  }
  return merged_list;
}
 
 
static void
oidc_cred_collect_finished_cb (void *cls)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeList *merged_list;
  struct GNUNET_RECLAIM_AttributeListEntry *le_m;
 
  handle->cred_it = NULL;
  merged_list = attribute_list_merge (handle->attr_idtoken_list,
                                      handle->attr_userinfo_list);
  for (le_m = merged_list->list_head; NULL != le_m; le_m = le_m->next)
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "List Attribute in ticket to issue: %s\n",
                le_m->attribute->name);
  handle->idp_op = GNUNET_RECLAIM_ticket_issue (idp,
                                                &handle->priv_key,
                                                handle->oidc->client_id,
                                                merged_list,
                                                &oidc_ticket_issue_cb,
                                                handle);
  GNUNET_RECLAIM_attribute_list_destroy (merged_list);
}
 
 
static void
oidc_cred_collect (void *cls,
                   const struct GNUNET_CRYPTO_BlindablePublicKey *identity,
                   const struct GNUNET_RECLAIM_Credential *cred)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeListEntry *le;
  struct GNUNET_RECLAIM_CredentialListEntry *ale;
 
  for (ale = handle->credentials->list_head; NULL != ale; ale = ale->next)
  {
    if (GNUNET_NO == GNUNET_RECLAIM_id_is_equal (&ale->credential->id,
                                                 &cred->id))
      continue;
    GNUNET_RECLAIM_get_credentials_next (handle->cred_it);
    return;
  }
 
  for (le = handle->attr_idtoken_list->list_head; NULL != le; le = le->next)
  {
    if (GNUNET_NO == GNUNET_RECLAIM_id_is_equal (&le->attribute->credential,
                                                 &cred->id))
      continue;
    ale = GNUNET_new (struct GNUNET_RECLAIM_CredentialListEntry);
    ale->credential = GNUNET_RECLAIM_credential_new (cred->name,
                                                     cred->type,
                                                     cred->data,
                                                     cred->data_size);
    GNUNET_CONTAINER_DLL_insert (handle->credentials->list_head,
                                 handle->credentials->list_tail,
                                 ale);
  }
  GNUNET_RECLAIM_get_credentials_next (handle->cred_it);
}
 
 
static void
oidc_attr_collect_finished_cb (void *cls)
{
  struct RequestHandle *handle = cls;
 
  handle->attr_it = NULL;
  handle->ticket_it = NULL;
  if (NULL == handle->attr_idtoken_list->list_head)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_SCOPE);
    handle->edesc = GNUNET_strdup ("The requested scope is not available.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
  handle->credentials = GNUNET_new (struct GNUNET_RECLAIM_CredentialList);
  handle->cred_it =
    GNUNET_RECLAIM_get_credentials_start (idp,
                                          &handle->priv_key,
                                          &oidc_iteration_error,
                                          handle,
                                          &oidc_cred_collect,
                                          handle,
                                          &oidc_cred_collect_finished_cb,
                                          handle);
 
}
 
 
static int
attr_in_claims_request (struct RequestHandle *handle,
                        const char *attr_name,
                        const char *claims_parameter)
{
  int ret = GNUNET_NO;
  json_t *root;
  json_error_t error;
  json_t *claims_j;
  const char *key;
  json_t *value;
 
  if (GNUNET_YES == OIDC_check_scopes_for_claim_request (handle->oidc->scope,
                                                         attr_name))
    return GNUNET_YES;
 
  if (NULL != handle->oidc->claims)
  {
    root = json_loads (handle->oidc->claims, JSON_DECODE_ANY, &error);
    claims_j = json_object_get (root, claims_parameter);
    /* obj is a JSON object */
    if (NULL != claims_j)
    {
      json_object_foreach (claims_j, key, value) {
        if (0 != strcmp (attr_name, key))
          continue;
        ret = GNUNET_YES;
        break;
      }
    }
    json_decref (root);
  }
  return ret;
}
 
 
static int
attr_in_idtoken_request (struct RequestHandle *handle,
                         const char *attr_name)
{
  return attr_in_claims_request (handle, attr_name, "id_token");
}
 
 
static int
attr_in_userinfo_request (struct RequestHandle *handle,
                          const char *attr_name)
{
  return attr_in_claims_request (handle, attr_name, "userinfo");
}
 
 
static void
oidc_attr_collect (void *cls,
                   const struct GNUNET_CRYPTO_BlindablePublicKey *identity,
                   const struct GNUNET_RECLAIM_Attribute *attr)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeListEntry *le;
  if (GNUNET_YES == attr_in_idtoken_request (handle, attr->name))
  {
    le = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le->attribute = GNUNET_RECLAIM_attribute_new (attr->name,
                                                  &attr->credential,
                                                  attr->type,
                                                  attr->data,
                                                  attr->data_size);
    le->attribute->id = attr->id;
    le->attribute->flag = attr->flag;
    le->attribute->credential = attr->credential;
    GNUNET_CONTAINER_DLL_insert (handle->attr_idtoken_list->list_head,
                                 handle->attr_idtoken_list->list_tail,
                                 le);
  }
  if (GNUNET_YES == attr_in_userinfo_request (handle, attr->name))
  {
    le = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le->attribute = GNUNET_RECLAIM_attribute_new (attr->name,
                                                  &attr->credential,
                                                  attr->type,
                                                  attr->data,
                                                  attr->data_size);
    le->attribute->id = attr->id;
    le->attribute->flag = attr->flag;
    le->attribute->credential = attr->credential;
    GNUNET_CONTAINER_DLL_insert (handle->attr_userinfo_list->list_head,
                                 handle->attr_userinfo_list->list_tail,
                                 le);
  }
 
  GNUNET_RECLAIM_get_attributes_next (handle->attr_it);
}
 
 
static void
code_redirect (void *cls)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_TIME_Absolute current_time;
  struct GNUNET_TIME_Absolute *relog_time;
  struct GNUNET_CRYPTO_BlindablePublicKey pubkey;
  struct GNUNET_CRYPTO_BlindablePublicKey ego_pkey;
  struct GNUNET_HashCode cache_key;
  char *identity_cookie;
 
  GNUNET_asprintf (&identity_cookie,
                   "Identity=%s",
                   handle->oidc->login_identity);
  GNUNET_CRYPTO_hash (identity_cookie, strlen (identity_cookie), &cache_key);
  GNUNET_free (identity_cookie);
  // No login time for identity -> redirect to login
  if (GNUNET_YES ==
      GNUNET_CONTAINER_multihashmap_contains (OIDC_cookie_jar_map, &cache_key))
  {
    relog_time =
      GNUNET_CONTAINER_multihashmap_get (OIDC_cookie_jar_map, &cache_key);
    current_time = GNUNET_TIME_absolute_get ();
    // 30 min after old login -> redirect to login
    if (current_time.abs_value_us <= relog_time->abs_value_us)
    {
      if (GNUNET_OK !=
          GNUNET_CRYPTO_blindable_public_key_from_string (handle->oidc
                                                          ->login_identity,
                                                          &pubkey))
      {
        handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_COOKIE);
        handle->edesc =
          GNUNET_strdup ("The cookie of a login identity is not valid");
        GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
        return;
      }
      // iterate over egos and compare their public key
      for (handle->ego_entry = ego_head; NULL != handle->ego_entry;
           handle->ego_entry = handle->ego_entry->next)
      {
        GNUNET_IDENTITY_ego_get_public_key (handle->ego_entry->ego, &ego_pkey);
        if (0 == GNUNET_memcmp (&ego_pkey, &pubkey))
        {
          handle->priv_key =
            *GNUNET_IDENTITY_ego_get_private_key (handle->ego_entry->ego);
          handle->attr_idtoken_list =
            GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
          handle->attr_userinfo_list =
            GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
          handle->attr_it =
            GNUNET_RECLAIM_get_attributes_start (idp,
                                                 &handle->priv_key,
                                                 &oidc_iteration_error,
                                                 handle,
                                                 &oidc_attr_collect,
                                                 handle,
                                                 &oidc_attr_collect_finished_cb,
                                                 handle);
          return;
        }
      }
      GNUNET_SCHEDULER_add_now (&login_redirect, handle);
      return;
    }
  }
}
 
 
static void
build_redirect (void *cls)
{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *redirect_uri;
 
  if (GNUNET_YES == handle->oidc->user_cancelled)
  {
    if ((NULL != handle->redirect_prefix) &&
        (NULL != handle->redirect_suffix) && (NULL != handle->tld))
    {
      GNUNET_asprintf (&redirect_uri,
                       "%s.%s/%s?error=%s&error_description=%s&state=%s",
                       handle->redirect_prefix,
                       handle->tld,
                       handle->redirect_suffix,
                       "access_denied",
                       "User denied access",
                       handle->oidc->state);
    }
    else
    {
      GNUNET_asprintf (&redirect_uri,
                       "%s?error=%s&error_description=%s&state=%s",
                       handle->oidc->redirect_uri,
                       "access_denied",
                       "User denied access",
                       handle->oidc->state);
    }
    resp = GNUNET_REST_create_response ("");
    GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                      "Location",
                                                      redirect_uri));
    handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
    cleanup_handle (handle);
    GNUNET_free (redirect_uri);
    return;
  }
  GNUNET_SCHEDULER_add_now (&code_redirect, handle);
}
 
 
static void
lookup_redirect_uri_result (void *cls,
                            uint32_t rd_count,
                            const struct GNUNET_GNSRECORD_Data *rd)
{
  struct RequestHandle *handle = cls;
  char *tmp;
  char *tmp_key_str;
  char *pos;
  struct GNUNET_CRYPTO_BlindablePublicKey redirect_zone;
 
  handle->gns_op = NULL;
  if (0 == rd_count)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc =
      GNUNET_strdup ("Server cannot generate ticket, redirect uri not found.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
  for (int i = 0; i < rd_count; i++)
  {
    if (GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_REDIRECT != rd[i].record_type)
      continue;
    if (0 != strncmp (rd[i].data, handle->oidc->redirect_uri, rd[i].data_size))
      continue;
    tmp = GNUNET_strndup (rd[i].data, rd[i].data_size);
    if (NULL == strstr (tmp, handle->oidc->client_id))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Redirect uri %s does not contain client_id %s\n",
                  tmp,
                  handle->oidc->client_id);
    }
    else
    {
      pos = strrchr (tmp, (unsigned char) '.');
      if (NULL == pos)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Redirect uri %s contains client_id but is malformed\n",
                    tmp);
        GNUNET_free (tmp);
        continue;
      }
      *pos = '\0';
      handle->redirect_prefix = GNUNET_strdup (tmp);
      tmp_key_str = pos + 1;
      pos = strchr (tmp_key_str, (unsigned char) '/');
      if (NULL == pos)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Redirect uri %s contains client_id but is malformed\n",
                    tmp);
        GNUNET_free (tmp);
        continue;
      }
      *pos = '\0';
      handle->redirect_suffix = GNUNET_strdup (pos + 1);
 
      GNUNET_STRINGS_string_to_data (tmp_key_str,
                                     strlen (tmp_key_str),
                                     &redirect_zone,
                                     sizeof(redirect_zone));
    }
    GNUNET_SCHEDULER_add_now (&build_redirect, handle);
    GNUNET_free (tmp);
    return;
  }
  handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
  handle->edesc =
    GNUNET_strdup ("Server cannot generate ticket, redirect uri not found.");
  GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
}
 
 
static void
client_redirect (void *cls)
{
  struct RequestHandle *handle = cls;
 
  /* Lookup client redirect uri to verify request */
  handle->gns_op =
    GNUNET_GNS_lookup (gns_handle,
                       GNUNET_GNS_EMPTY_LABEL_AT,
                       &handle->oidc->client_pkey,
                       GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_REDIRECT,
                       GNUNET_GNS_LO_DEFAULT,
                       &lookup_redirect_uri_result,
                       handle);
}
 
 
static char *
get_url_parameter_copy (const struct RequestHandle *handle, const char *key)
{
  struct GNUNET_HashCode hc;
  char *value;
  char *res;
 
  GNUNET_CRYPTO_hash (key, strlen (key), &hc);
  if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                            ->url_param_map,
                                                            &hc))
    return NULL;
  value =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->url_param_map, &hc);
  if (NULL == value)
    return NULL;
  GNUNET_STRINGS_urldecode (value, strlen (value), &res);
  return res;
}
 
 
static void
build_authz_response (void *cls)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_HashCode cache_key;
 
  char *expected_scope;
  char delimiter[] = " ";
  char *test;
  int number_of_ignored_parameter, iterator;
 
 
  // REQUIRED value: redirect_uri
  handle->oidc->redirect_uri =
    get_url_parameter_copy (handle, OIDC_REDIRECT_URI_KEY);
  if (NULL == handle->oidc->redirect_uri)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter redirect_uri");
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // REQUIRED value: response_type
  handle->oidc->response_type =
    get_url_parameter_copy (handle, OIDC_RESPONSE_TYPE_KEY);
  if (NULL == handle->oidc->response_type)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter response_type");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
 
  // REQUIRED value: scope
  handle->oidc->scope = get_url_parameter_copy (handle, OIDC_SCOPE_KEY);
  if (NULL == handle->oidc->scope)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_SCOPE);
    handle->edesc = GNUNET_strdup ("missing parameter scope");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
 
  // OPTIONAL value: nonce
  handle->oidc->nonce = get_url_parameter_copy (handle, OIDC_NONCE_KEY);
 
  // OPTIONAL value: claims
  handle->oidc->claims = get_url_parameter_copy (handle, OIDC_CLAIMS_KEY);
 
  // TODO check other values if needed
  number_of_ignored_parameter =
    sizeof(OIDC_ignored_parameter_array) / sizeof(char *);
  for (iterator = 0; iterator < number_of_ignored_parameter; iterator++)
  {
    GNUNET_CRYPTO_hash (OIDC_ignored_parameter_array[iterator],
                        strlen (OIDC_ignored_parameter_array[iterator]),
                        &cache_key);
    if (GNUNET_YES ==
        GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                ->url_param_map,
                                                &cache_key))
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_ACCESS_DENIED);
      GNUNET_asprintf (&handle->edesc,
                       "Server will not handle parameter: %s",
                       OIDC_ignored_parameter_array[iterator]);
      GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
      return;
    }
  }
 
  // We only support authorization code flows.
  if (0 != strcmp (handle->oidc->response_type,
                   OIDC_EXPECTED_AUTHORIZATION_RESPONSE_TYPE))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_UNSUPPORTED_RESPONSE_TYPE);
    handle->edesc = GNUNET_strdup ("The authorization server does not support "
                                   "obtaining this authorization code.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
 
  // Checks if scope contains 'openid'
  expected_scope = GNUNET_strdup (handle->oidc->scope);
  test = strtok (expected_scope, delimiter);
  while (NULL != test)
  {
    if (0 == strcmp (OIDC_EXPECTED_AUTHORIZATION_SCOPE, expected_scope))
      break;
    test = strtok (NULL, delimiter);
  }
  if (NULL == test)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_SCOPE);
    handle->edesc =
      GNUNET_strdup ("The requested scope is invalid, unknown, or malformed.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    GNUNET_free (expected_scope);
    return;
  }
 
  GNUNET_free (expected_scope);
  if ((NULL == handle->oidc->login_identity) &&
      (GNUNET_NO == handle->oidc->user_cancelled))
    GNUNET_SCHEDULER_add_now (&login_redirect, handle);
  else
    GNUNET_SCHEDULER_add_now (&client_redirect, handle);
}
 
 
static void
tld_iter (void *cls, const char *section, const char *option, const char *value)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_CRYPTO_BlindablePublicKey pkey;
 
  if (GNUNET_OK !=
      GNUNET_CRYPTO_blindable_public_key_from_string (value, &pkey))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Skipping non key %s\n", value);
    return;
  }
  if (0 == GNUNET_memcmp (&pkey, &handle->oidc->client_pkey))
    handle->tld = GNUNET_strdup (option + 1);
}
 
 
static void
authorize_endpoint (struct GNUNET_REST_RequestHandle *con_handle,
                    const char *url,
                    void *cls)
{
  struct RequestHandle *handle = cls;
  struct EgoEntry *tmp_ego;
  const struct GNUNET_CRYPTO_BlindablePrivateKey *priv_key;
  struct GNUNET_CRYPTO_BlindablePublicKey pkey;
 
  cookie_identity_interpretation (handle);
 
  // RECOMMENDED value: state - REQUIRED for answers
  handle->oidc->state = get_url_parameter_copy (handle, OIDC_STATE_KEY);
 
  // REQUIRED value: client_id
  handle->oidc->client_id = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
  if (NULL == handle->oidc->client_id)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter client_id");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // OPTIONAL value: code_challenge
  handle->oidc->code_challenge = get_url_parameter_copy (handle,
                                                         OIDC_CODE_CHALLENGE_KEY);
  if (NULL == handle->oidc->code_challenge)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "OAuth authorization request does not contain PKCE parameters!\n");
  }
 
  if (GNUNET_OK !=
      GNUNET_CRYPTO_blindable_public_key_from_string (handle->oidc->client_id,
                                                      &handle->oidc->client_pkey
                                                      ))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_UNAUTHORIZED_CLIENT);
    handle->edesc = GNUNET_strdup ("The client is not authorized to request an "
                                   "authorization code using this method.");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // If we know this identity, translated the corresponding TLD
  // TODO: We might want to have a reverse lookup functionality for TLDs?
  for (tmp_ego = ego_head; NULL != tmp_ego; tmp_ego = tmp_ego->next)
  {
    priv_key = GNUNET_IDENTITY_ego_get_private_key (tmp_ego->ego);
    GNUNET_CRYPTO_blindable_key_get_public (priv_key, &pkey);
    if (0 == GNUNET_memcmp (&pkey, &handle->oidc->client_pkey))
    {
      handle->tld = GNUNET_strdup (tmp_ego->identifier);
      handle->ego_entry = ego_tail;
    }
  }
  if (NULL == handle->tld)
    GNUNET_CONFIGURATION_iterate_section_values (oid_cfg, "gns", tld_iter,
                                                 handle);
  if (NULL == handle->tld)
    handle->tld = GNUNET_strdup (handle->oidc->client_id);
  GNUNET_SCHEDULER_add_now (&build_authz_response, handle);
}
 
 
static void
login_cont (struct GNUNET_REST_RequestHandle *con_handle,
            const char *url,
            void *cls)
{
  struct MHD_Response *resp = GNUNET_REST_create_response ("");
  struct RequestHandle *handle = cls;
  struct GNUNET_HashCode cache_key;
  struct GNUNET_TIME_Absolute *current_time;
  struct GNUNET_TIME_Absolute *last_time;
  char *cookie;
  char *header_val;
  json_t *root;
  json_error_t error;
  json_t *identity;
  char term_data[handle->rest_handle->data_size + 1];
 
  term_data[handle->rest_handle->data_size] = '\0';
  GNUNET_memcpy (term_data,
                 handle->rest_handle->data,
                 handle->rest_handle->data_size);
  root = json_loads (term_data, JSON_DECODE_ANY, &error);
  identity = json_object_get (root, "identity");
  if (! json_is_string (identity))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Error parsing json string from %s\n",
                term_data);
    handle->proc (handle->proc_cls, resp, MHD_HTTP_BAD_REQUEST);
    json_decref (root);
    cleanup_handle (handle);
    return;
  }
  GNUNET_asprintf (&cookie, "Identity=%s", json_string_value (identity));
  GNUNET_asprintf (&header_val,
                   "%s;Max-Age=%d",
                   cookie,
                   OIDC_COOKIE_EXPIRATION);
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Set-Cookie", header_val));
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          "Access-Control-Allow-Methods",
                                          "POST"));
  GNUNET_CRYPTO_hash (cookie, strlen (cookie), &cache_key);
 
  if (0 != strcmp (json_string_value (identity), "Denied"))
  {
    current_time = GNUNET_new (struct GNUNET_TIME_Absolute);
    *current_time = GNUNET_TIME_relative_to_absolute (
      GNUNET_TIME_relative_multiply (GNUNET_TIME_relative_get_second_ (),
                                     OIDC_COOKIE_EXPIRATION));
    last_time =
      GNUNET_CONTAINER_multihashmap_get (OIDC_cookie_jar_map, &cache_key);
    GNUNET_free (last_time);
    GNUNET_CONTAINER_multihashmap_put (OIDC_cookie_jar_map,
                                       &cache_key,
                                       current_time,
                                       GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
  }
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  GNUNET_free (cookie);
  GNUNET_free (header_val);
  json_decref (root);
  cleanup_handle (handle);
}
 
 
static int
parse_credentials_basic_auth (struct RequestHandle *handle,
                              char **client_id,
                              char **client_secret)
{
  struct GNUNET_HashCode cache_key;
  char *authorization;
  char *credentials;
  char *basic_authorization;
  char *client_id_tmp;
  char *pass;
 
  GNUNET_CRYPTO_hash (OIDC_AUTHORIZATION_HEADER_KEY,
                      strlen (OIDC_AUTHORIZATION_HEADER_KEY),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->header_param_map,
                                                           &cache_key))
    return GNUNET_SYSERR;
  authorization =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->header_param_map,
                                       &cache_key);
 
  // split header in "Basic" and [content]
  credentials = strtok (authorization, " ");
  if ((NULL == credentials) || (0 != strcmp ("Basic", credentials)))
    return GNUNET_SYSERR;
  credentials = strtok (NULL, " ");
  if (NULL == credentials)
    return GNUNET_SYSERR;
  GNUNET_STRINGS_base64_decode (credentials,
                                strlen (credentials),
                                (void **) &basic_authorization);
 
  if (NULL == basic_authorization)
    return GNUNET_SYSERR;
  client_id_tmp = strtok (basic_authorization, ":");
  if (NULL == client_id_tmp)
  {
    GNUNET_free (basic_authorization);
    return GNUNET_SYSERR;
  }
  pass = strtok (NULL, ":");
  if (NULL == pass)
  {
    GNUNET_free (basic_authorization);
    return GNUNET_SYSERR;
  }
  *client_id = strdup (client_id_tmp);
  *client_secret = strdup (pass);
  GNUNET_free (basic_authorization);
  return GNUNET_OK;
}
 
 
static int
parse_credentials_post_body (struct RequestHandle *handle,
                             char **client_id,
                             char **client_secret)
{
  struct GNUNET_HashCode cache_key;
  char *client_id_tmp;
  char *pass;
 
  GNUNET_CRYPTO_hash ("client_id",
                      strlen ("client_id"),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->url_param_map,
                                                           &cache_key))
    return GNUNET_SYSERR;
  client_id_tmp = GNUNET_CONTAINER_multihashmap_get (
    handle->rest_handle->url_param_map,
    &cache_key);
  if (NULL == client_id_tmp)
    return GNUNET_SYSERR;
  *client_id = strdup (client_id_tmp);
  GNUNET_CRYPTO_hash ("client_secret",
                      strlen ("client_secret"),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->url_param_map,
                                                           &cache_key))
  {
    GNUNET_free (*client_id);
    *client_id = NULL;
    return GNUNET_SYSERR;
  }
  pass = GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->url_param_map,
                                            &cache_key);
  if (NULL == pass)
  {
    GNUNET_free (*client_id);
    *client_id = NULL;
    return GNUNET_SYSERR;
  }
  *client_secret = strdup (pass);
  return GNUNET_OK;
}
 
 
static int
check_authorization (struct RequestHandle *handle,
                     struct GNUNET_CRYPTO_BlindablePublicKey *cid)
{
  char *expected_pass;
  char *received_cid;
  char *received_cpw;
  char *pkce_cv;
 
  if (GNUNET_OK == parse_credentials_basic_auth (handle,
                                                 &received_cid,
                                                 &received_cpw))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Received client credentials in HTTP AuthZ header\n");
  }
  else if (GNUNET_OK == parse_credentials_post_body (handle,
                                                     &received_cid,
                                                     &received_cpw))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Received client credentials in POST body\n");
  }
  else
  {
    pkce_cv = get_url_parameter_copy (handle, OIDC_CODE_VERIFIER_KEY);
    if (NULL == pkce_cv)
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_CLIENT);
      handle->response_code = MHD_HTTP_UNAUTHORIZED;
      return GNUNET_SYSERR;
    }
    handle->public_client = GNUNET_YES;
    GNUNET_free (pkce_cv);
    received_cid = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
    GNUNET_STRINGS_string_to_data (received_cid,
                                   strlen (received_cid),
                                   cid,
                                   sizeof(struct
                                          GNUNET_CRYPTO_BlindablePublicKey));
    GNUNET_free (received_cid);
    return GNUNET_OK;
 
  }
 
  // check client password
  if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                          "reclaim-rest-plugin",
                                                          "OIDC_CLIENT_HMAC_SECRET",
                                                          &expected_pass))
  {
    if (0 != strcmp (expected_pass, received_cpw))
    {
      GNUNET_free (expected_pass);
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_CLIENT);
      handle->response_code = MHD_HTTP_UNAUTHORIZED;
      GNUNET_free (received_cpw);
      GNUNET_free (received_cid);
      return GNUNET_SYSERR;
    }
    GNUNET_free (expected_pass);
  }
  else
  {
    GNUNET_free (received_cpw);
    GNUNET_free (received_cid);
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    return GNUNET_SYSERR;
  }
  // check client_id
  for (handle->ego_entry = ego_head; NULL != handle->ego_entry;
       handle->ego_entry = handle->ego_entry->next)
  {
    if (0 == strcmp (handle->ego_entry->keystring, received_cid))
      break;
  }
  if (NULL == handle->ego_entry)
  {
    GNUNET_free (received_cpw);
    GNUNET_free (received_cid);
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_CLIENT);
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    return GNUNET_SYSERR;
  }
  GNUNET_STRINGS_string_to_data (received_cid,
                                 strlen (received_cid),
                                 cid,
                                 sizeof(struct GNUNET_CRYPTO_BlindablePublicKey)
                                 );
 
  GNUNET_free (received_cpw);
  GNUNET_free (received_cid);
  return GNUNET_OK;
}
 
 
static const struct EgoEntry *
find_ego (struct RequestHandle *handle,
          struct GNUNET_CRYPTO_BlindablePublicKey *test_key)
{
  struct EgoEntry *ego_entry;
  struct GNUNET_CRYPTO_BlindablePublicKey pub_key;
 
  for (ego_entry = ego_head; NULL != ego_entry;
       ego_entry = ego_entry->next)
  {
    GNUNET_IDENTITY_ego_get_public_key (ego_entry->ego, &pub_key);
    if (0 == GNUNET_memcmp (&pub_key, test_key))
      return ego_entry;
  }
  return NULL;
}
 
 
static void
token_endpoint (struct GNUNET_REST_RequestHandle *con_handle,
                const char *url,
                void *cls)
{
  struct RequestHandle *handle = cls;
  const struct EgoEntry *ego_entry = NULL;
  struct GNUNET_TIME_Relative expiration_time;
  struct GNUNET_RECLAIM_AttributeList *cl = NULL;
  struct GNUNET_RECLAIM_PresentationList *pl = NULL;
  struct GNUNET_RECLAIM_Ticket ticket;
  struct GNUNET_CRYPTO_BlindablePublicKey cid;
  struct GNUNET_HashCode cache_key;
  struct MHD_Response *resp = NULL;
  struct GNUNET_CRYPTO_BlindablePublicKey issuer;
  char *grant_type = NULL;
  char *code = NULL;
  char *json_response = NULL;
  char *id_token = NULL;
  char *access_token = NULL;
  char *jwa = NULL;
  char *jwt_secret = NULL;
  char *nonce = NULL;
  char *code_verifier = NULL;
  json_t *oidc_jwk_tmp = NULL;
  char *oidc_jwk_path = NULL;
  char *oidc_directory = NULL;
  char *tmp_at = NULL;
  char *received_cid = NULL;
  char *emsg = NULL;
 
  /*
   * Check Authorization
   */
  if (GNUNET_SYSERR == check_authorization (handle, &cid))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "OIDC authorization for token endpoint failed\n");
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  received_cid = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
 
  /*
   * Check parameter
   */
 
  // TODO Do not allow multiple equal parameter names
  // REQUIRED grant_type
  GNUNET_CRYPTO_hash (OIDC_GRANT_TYPE_KEY,
                      strlen (OIDC_GRANT_TYPE_KEY),
                      &cache_key);
  grant_type = get_url_parameter_copy (handle, OIDC_GRANT_TYPE_KEY);
  if (NULL == grant_type)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter grant_type");
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // Check parameter grant_type == "authorization_code"
  if (0 != strcmp (OIDC_GRANT_TYPE_VALUE, grant_type))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_UNSUPPORTED_GRANT_TYPE);
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (grant_type);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  GNUNET_free (grant_type);
  // REQUIRED code
  code = get_url_parameter_copy (handle, OIDC_CODE_KEY);
  if (NULL == code)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter code");
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  ego_entry = find_ego (handle, &cid);
  if (NULL == ego_entry)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("Unknown client");
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (code);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // REQUIRED code verifier
  code_verifier = get_url_parameter_copy (handle, OIDC_CODE_VERIFIER_KEY);
  if (NULL == code_verifier)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "OAuth authorization request does not contain PKCE parameters!\n");
 
  }
 
  // decode code
  if (GNUNET_OK != OIDC_parse_authz_code (received_cid, &cid, code,
                                          code_verifier,
                                          &ticket,
                                          &cl, &pl, &nonce,
                                          OIDC_VERIFICATION_DEFAULT,
                                          &emsg))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = emsg;
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (code);
    if (NULL != code_verifier)
      GNUNET_free (code_verifier);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  if (NULL != code_verifier)
    GNUNET_free (code_verifier);
 
  // create jwt
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (oid_cfg,
                                                        "reclaim-rest-plugin",
                                                        "expiration_time",
                                                        &expiration_time))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_free (code);
    if (NULL != nonce)
      GNUNET_free (nonce);
    GNUNET_RECLAIM_attribute_list_destroy (cl);
    GNUNET_RECLAIM_presentation_list_destroy (pl);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // Check if HMAC or RSA should be used
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                          "reclaim-rest-plugin",
                                                          "oidc_json_web_algorithm",
                                                          &jwa))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Could not read OIDC JSON Web Algorithm config attribute."
                "Defaulting to RS256.");
    jwa = GNUNET_strdup (JWT_ALG_VALUE_RSA);
  }
 
  GNUNET_GNS_parse_ztld (ticket.gns_name, &issuer);
 
  if (! strcmp (jwa, JWT_ALG_VALUE_RSA))
  {
    // Replace for now
    oidc_jwk_path = get_oidc_jwk_path (cls);
    oidc_jwk_tmp = read_jwk_from_file (oidc_jwk_path);
 
    // Check if secret JWK exists
    if (! oidc_jwk_tmp)
    {
      // Generate and save a new key
      oidc_jwk_tmp = generate_jwk ();
      oidc_directory = get_oidc_dir_path (cls);
 
      // Create new oidc directory
      if (GNUNET_OK != GNUNET_DISK_directory_create (oidc_directory))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    ("Failed to create directory `%s' for storing oidc data\n"),
                    oidc_directory);
      }
      else
      {
        write_jwk_to_file (oidc_jwk_path, oidc_jwk_tmp);
      }
    }
 
    // Generate oidc token
    id_token = OIDC_generate_id_token_rsa (received_cid,
                                           &issuer,
                                           cl,
                                           pl,
                                           &expiration_time,
                                           (NULL != nonce) ? nonce : NULL,
                                           oidc_jwk_tmp);
  }
  else if (! strcmp (jwa, JWT_ALG_VALUE_HMAC))
  {
    // TODO OPTIONAL acr,amr,azp
    if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                            "reclaim-rest-plugin",
                                                            "jwt_secret",
                                                            &jwt_secret))
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
      handle->edesc = GNUNET_strdup ("No signing secret configured!");
      handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
      GNUNET_free (code);
      GNUNET_RECLAIM_attribute_list_destroy (cl);
      GNUNET_RECLAIM_presentation_list_destroy (pl);
      if (NULL != nonce)
        GNUNET_free (nonce);
      GNUNET_free (jwa);
      GNUNET_SCHEDULER_add_now (&do_error, handle);
      return;
    }
 
    id_token = OIDC_generate_id_token_hmac (received_cid,
                                            &issuer,
                                            cl,
                                            pl,
                                            &expiration_time,
                                            (NULL != nonce) ? nonce : NULL,
                                            jwt_secret);
 
    GNUNET_free (jwt_secret);
  }
  else
  {
    // TODO: OPTION NOT FOUND ERROR
  }
  GNUNET_free (jwa);
 
  if (NULL != nonce)
    GNUNET_free (nonce);
  access_token = OIDC_access_token_new (&ticket, handle->oidc->redirect_uri);
  GNUNET_CRYPTO_hash (access_token,
                      strlen (access_token),
                      &cache_key);
  tmp_at = GNUNET_CONTAINER_multihashmap_get (oidc_code_cache,
                                              &cache_key);
  GNUNET_CONTAINER_multihashmap_put (oidc_code_cache,
                                     &cache_key,
                                     code,
                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
  /* If there was a previous code in there, free the old value */
  if (NULL != tmp_at)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "OIDC access token already issued. Cleanup.\n");
    GNUNET_free (tmp_at);
  }
 
  OIDC_build_token_response (access_token,
                             id_token,
                             &expiration_time,
                             &json_response);
 
  resp = GNUNET_REST_create_response (json_response);
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Cache-Control",
                                                    "no-store"));
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Pragma", "no-cache"));
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Content-Type",
                                                    "application/json"));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  GNUNET_RECLAIM_attribute_list_destroy (cl);
  GNUNET_RECLAIM_presentation_list_destroy (pl);
  GNUNET_free (access_token);
  GNUNET_free (json_response);
  GNUNET_free (id_token);
  cleanup_handle (handle);
}
 
 
static void
consume_ticket (void *cls,
                const struct GNUNET_CRYPTO_BlindablePublicKey *identity,
                const struct GNUNET_RECLAIM_Attribute *attr,
                const struct GNUNET_RECLAIM_Presentation *presentation)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeListEntry *ale;
  struct GNUNET_RECLAIM_PresentationListEntry *atle;
  struct MHD_Response *resp;
  struct GNUNET_HashCode cache_key;
  char *result_str;
  char *cached_code;
 
  if (NULL != handle->consume_timeout_op)
    GNUNET_SCHEDULER_cancel (handle->consume_timeout_op);
  handle->consume_timeout_op = NULL;
  handle->idp_op = NULL;
 
  GNUNET_CRYPTO_hash (handle->access_token,
                      strlen (handle->access_token),
                      &cache_key);
  cached_code = GNUNET_CONTAINER_multihashmap_get (oidc_code_cache,
                                                   &cache_key);
  if (NULL != cached_code)
  {
    GNUNET_assert (GNUNET_YES ==
                   GNUNET_CONTAINER_multihashmap_remove (oidc_code_cache,
                                                         &cache_key,
                                                         cached_code));
    GNUNET_free (cached_code);
  }
 
 
  if (NULL == identity)
  {
    struct GNUNET_CRYPTO_BlindablePublicKey issuer;
    char *key;
    char *tmp = GNUNET_strdup (handle->ticket.gns_name);
    GNUNET_assert (NULL != strtok (tmp, "."));
    key = strtok (NULL, ".");
    GNUNET_assert (NULL != key);
    GNUNET_assert (GNUNET_OK ==
                   GNUNET_CRYPTO_blindable_public_key_from_string (key, &issuer)
                   );
    GNUNET_free (tmp);
    result_str = OIDC_generate_userinfo (&issuer,
                                         handle->attr_userinfo_list,
                                         handle->presentations);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Userinfo: %s\n", result_str);
    resp = GNUNET_REST_create_response (result_str);
    handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
    GNUNET_free (result_str);
    cleanup_handle (handle);
    return;
  }
  ale = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
  ale->attribute = GNUNET_RECLAIM_attribute_new (attr->name,
                                                 &attr->credential,
                                                 attr->type,
                                                 attr->data,
                                                 attr->data_size);
  ale->attribute->id = attr->id;
  ale->attribute->flag = attr->flag;
  ale->attribute->credential = attr->credential;
  GNUNET_CONTAINER_DLL_insert (handle->attr_userinfo_list->list_head,
                               handle->attr_userinfo_list->list_tail,
                               ale);
  if (NULL == presentation)
    return;
  for (atle = handle->presentations->list_head;
       NULL != atle; atle = atle->next)
  {
    if (GNUNET_NO == GNUNET_RECLAIM_id_is_equal (
          &atle->presentation->credential_id,
          &presentation->credential_id))
      continue;
    break; 
  }
  if (NULL == atle)
  {
    atle = GNUNET_new (struct GNUNET_RECLAIM_PresentationListEntry);
    atle->presentation = GNUNET_RECLAIM_presentation_new (presentation->type,
                                                          presentation->data,
                                                          presentation->
                                                          data_size);
    atle->presentation->credential_id = presentation->credential_id;
    GNUNET_CONTAINER_DLL_insert (handle->presentations->list_head,
                                 handle->presentations->list_tail,
                                 atle);
  }
}
 
 
static void
consume_fail (void *cls)
{
  struct RequestHandle *handle = cls;
  struct GNUNET_HashCode cache_key;
  struct GNUNET_RECLAIM_AttributeList *cl = NULL;
  struct GNUNET_RECLAIM_PresentationList *pl = NULL;
  struct GNUNET_RECLAIM_Ticket ticket;
  struct GNUNET_CRYPTO_BlindablePublicKey cid;
  struct MHD_Response *resp;
  struct GNUNET_CRYPTO_BlindablePublicKey issuer;
  char *nonce;
  char *cached_code;
  char *result_str;
  char *received_cid;
  char *emsg;
  char *tmp;
  char *key;
 
  handle->consume_timeout_op = NULL;
  if (NULL != handle->idp_op)
    GNUNET_RECLAIM_cancel (handle->idp_op);
  handle->idp_op = NULL;
 
  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              "Ticket consumptioned timed out. Using cache...\n");
  GNUNET_CRYPTO_hash (handle->access_token,
                      strlen (handle->access_token),
                      &cache_key);
  cached_code = GNUNET_CONTAINER_multihashmap_get (oidc_code_cache,
                                                   &cache_key);
  if (NULL == cached_code)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("No Access Token in cache!");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    return;
  }
  GNUNET_assert (GNUNET_YES ==
                 GNUNET_CONTAINER_multihashmap_remove (oidc_code_cache,
                                                       &cache_key,
                                                       cached_code));
  received_cid = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
  GNUNET_STRINGS_string_to_data (received_cid,
                                 strlen (received_cid),
                                 &cid,
                                 sizeof(struct GNUNET_CRYPTO_BlindablePublicKey)
                                 );
 
  // decode code
  if (GNUNET_OK != OIDC_parse_authz_code (received_cid, &cid,
                                          cached_code, NULL, &ticket,
                                          &cl, &pl, &nonce,
                                          OIDC_VERIFICATION_NO_CODE_VERIFIER, &
                                          emsg))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = emsg;
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (cached_code);
    if (NULL != nonce)
      GNUNET_free (nonce);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  GNUNET_free (cached_code);
 
  tmp = GNUNET_strdup (handle->ticket.gns_name);
  GNUNET_assert (NULL != strtok (tmp, "."));
  key = strtok (NULL, ".");
  GNUNET_assert (NULL != key);
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CRYPTO_blindable_public_key_from_string (key, &issuer));
  GNUNET_free (tmp);
  result_str = OIDC_generate_userinfo (&issuer,
                                       cl,
                                       pl);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Userinfo: %s\n", result_str);
  resp = GNUNET_REST_create_response (result_str);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  GNUNET_free (result_str);
  GNUNET_free (nonce);
  GNUNET_RECLAIM_attribute_list_destroy (cl);
  GNUNET_RECLAIM_presentation_list_destroy (pl);
  cleanup_handle (handle);
}
 
 
static void
userinfo_endpoint (struct GNUNET_REST_RequestHandle *con_handle,
                   const char *url,
                   void *cls)
{
  // TODO expiration time
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_Ticket *ticket;
  char delimiter[] = " ";
  struct GNUNET_HashCode cache_key;
  char *authorization;
  char *authorization_type;
  char *authorization_access_token;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Getting userinfo\n");
  GNUNET_CRYPTO_hash (OIDC_AUTHORIZATION_HEADER_KEY,
                      strlen (OIDC_AUTHORIZATION_HEADER_KEY),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->header_param_map,
                                                           &cache_key))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("No Access Token");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    return;
  }
  authorization =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->header_param_map,
                                       &cache_key);
 
  // split header in "Bearer" and access_token
  authorization = GNUNET_strdup (authorization);
  authorization_type = strtok (authorization, delimiter);
  if ((NULL == authorization_type) ||
      (0 != strcmp ("Bearer", authorization_type)))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("No Access Token");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    GNUNET_free (authorization);
    return;
  }
  authorization_access_token = strtok (NULL, delimiter);
  if (NULL == authorization_access_token)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("Access token missing");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    GNUNET_free (authorization);
    return;
  }
 
  {
    char *rp_uri;
    if (GNUNET_OK != OIDC_access_token_parse (authorization_access_token,
                                              &ticket, &rp_uri))
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
      handle->edesc = GNUNET_strdup ("The access token is invalid");
      handle->response_code = MHD_HTTP_UNAUTHORIZED;
      GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
      GNUNET_free (authorization);
      return;
 
    }
    GNUNET_assert (NULL != ticket);
    handle->ticket = *ticket;
    GNUNET_free (ticket);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Consuming ticket\n");
    handle->attr_userinfo_list =
      GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
    handle->presentations =
      GNUNET_new (struct GNUNET_RECLAIM_PresentationList);
 
    /* If the consume takes too long, we use values from the cache */
    handle->access_token = GNUNET_strdup (authorization_access_token);
    handle->consume_timeout_op = GNUNET_SCHEDULER_add_delayed (consume_timeout,
                                                               &consume_fail,
                                                               handle);
    handle->idp_op = GNUNET_RECLAIM_ticket_consume (idp,
                                                    &handle->ticket,
                                                    rp_uri,
                                                    &consume_ticket,
                                                    handle);
    GNUNET_free (authorization);
    GNUNET_free (rp_uri);
  }
}
 
 
static void
jwks_endpoint (struct GNUNET_REST_RequestHandle *con_handle,
               const char *url,
               void *cls)
{
  char *oidc_directory;
  char *oidc_jwk_path;
  char *oidc_jwk_pub_str;
  json_t *oidc_jwk_tmp;
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  oidc_jwk_path = get_oidc_jwk_path (cls);
  oidc_jwk_tmp = read_jwk_from_file (oidc_jwk_path);
 
  // Check if secret JWK exists
  if (! oidc_jwk_tmp)
  {
    // Generate and save a new key
    oidc_jwk_tmp = generate_jwk ();
    oidc_directory = get_oidc_dir_path (cls);
 
    // Create new oidc directory
    if (GNUNET_OK != GNUNET_DISK_directory_create (oidc_directory))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  ("Failed to create directory `%s' for storing oidc data\n"),
                  oidc_directory);
    }
    else
    {
      write_jwk_to_file (oidc_jwk_path, oidc_jwk_tmp);
    }
  }
 
  // Convert secret JWK to public JWK
  jose_jwk_pub (NULL, oidc_jwk_tmp);
 
  // Encode JWK as string and return to API endpoint
  oidc_jwk_pub_str = json_dumps (oidc_jwk_tmp, JSON_INDENT (1));
  resp = GNUNET_REST_create_response (oidc_jwk_pub_str);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  json_decref (oidc_jwk_tmp);
  GNUNET_free (oidc_jwk_pub_str);
  GNUNET_free (oidc_jwk_pub_str);
  cleanup_handle (handle);
}
 
 
static void
list_ego (void *cls,
          struct GNUNET_IDENTITY_Ego *ego,
          void **ctx,
          const char *identifier)
{
  struct EgoEntry *ego_entry;
  struct GNUNET_CRYPTO_BlindablePublicKey pk;
 
  if (NULL == ego)
  {
    state = ID_REST_STATE_POST_INIT;
    return;
  }
  if (ID_REST_STATE_INIT == state)
 
  {
    ego_entry = GNUNET_new (struct EgoEntry);
    GNUNET_IDENTITY_ego_get_public_key (ego, &pk);
    ego_entry->keystring = GNUNET_CRYPTO_blindable_public_key_to_string (&pk);
    ego_entry->ego = ego;
    ego_entry->identifier = GNUNET_strdup (identifier);
    GNUNET_CONTAINER_DLL_insert_tail (ego_head,
                                      ego_tail,
                                      ego_entry);
    return;
  }
  /* Ego renamed or added */
  if (identifier != NULL)
  {
    for (ego_entry = ego_head; NULL != ego_entry;
         ego_entry = ego_entry->next)
    {
      if (ego_entry->ego == ego)
      {
        /* Rename */
        GNUNET_free (ego_entry->identifier);
        ego_entry->identifier = GNUNET_strdup (identifier);
        break;
      }
    }
    if (NULL == ego_entry)
    {
      /* Add */
      ego_entry = GNUNET_new (struct EgoEntry);
      GNUNET_IDENTITY_ego_get_public_key (ego, &pk);
      ego_entry->keystring = GNUNET_CRYPTO_blindable_public_key_to_string (&pk);
      ego_entry->ego = ego;
      ego_entry->identifier = GNUNET_strdup (identifier);
      GNUNET_CONTAINER_DLL_insert_tail (ego_head,
                                        ego_tail,
                                        ego_entry);
    }
  }
  else
  {
    /* Delete */
    for (ego_entry = ego_head; NULL != ego_entry;
         ego_entry = ego_entry->next)
    {
      if (ego_entry->ego == ego)
        break;
    }
    if (NULL == ego_entry)
      return; /* Not found */
 
    GNUNET_CONTAINER_DLL_remove (ego_head,
                                 ego_tail,
                                 ego_entry);
    GNUNET_free (ego_entry->identifier);
    GNUNET_free (ego_entry->keystring);
    GNUNET_free (ego_entry);
    return;
  }
}
 
 
static void
oidc_config_endpoint (struct GNUNET_REST_RequestHandle *con_handle,
                      const char *url,
                      void *cls)
{
  json_t *oidc_config;
  json_t *auth_methods;
  json_t *sig_algs;
  json_t *scopes;
  json_t *response_types;
  json_t *sub_types;
  json_t *claim_types;
  char *oidc_config_str;
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  oidc_config = json_object ();
  // FIXME get from config?
  json_object_set_new (oidc_config,
                       "issuer", json_string ("http://localhost:7776"));
  json_object_set_new (oidc_config,
                       "authorization_endpoint",
                       json_string ("https://api.reclaim/openid/authorize"));
  json_object_set_new (oidc_config,
                       "token_endpoint",
                       json_string ("http://localhost:7776/openid/token"));
  auth_methods = json_array ();
  json_array_append_new (auth_methods,
                         json_string ("client_secret_basic"));
  json_array_append_new (auth_methods,
                         json_string ("client_secret_post"));
  json_object_set_new (oidc_config,
                       "token_endpoint_auth_methods_supported",
                       auth_methods);
  sig_algs = json_array ();
  json_array_append_new (sig_algs,
                         json_string ("HS512"));
  json_array_append_new (sig_algs,
                         json_string ("RS256"));
  json_object_set_new (oidc_config,
                       "id_token_signing_alg_values_supported",
                       sig_algs);
  json_object_set_new (oidc_config,
                       "jwks_uri",
                       json_string ("http://localhost:7776/jwks.json"));
  json_object_set_new (oidc_config,
                       "userinfo_endpoint",
                       json_string ("http://localhost:7776/openid/userinfo"));
  scopes = json_array ();
  json_array_append_new (scopes,
                         json_string ("openid"));
  json_array_append_new (scopes,
                         json_string ("profile"));
  json_array_append_new (scopes,
                         json_string ("email"));
  json_array_append_new (scopes,
                         json_string ("address"));
  json_array_append_new (scopes,
                         json_string ("phone"));
  json_object_set_new (oidc_config,
                       "scopes_supported",
                       scopes);
  response_types = json_array ();
  json_array_append_new (response_types,
                         json_string ("code"));
  json_object_set_new (oidc_config,
                       "response_types_supported",
                       response_types);
  sub_types = json_array ();
  json_array_append_new (sub_types,
                         json_string ("public"));  /* no pairwise support */
  json_object_set_new (oidc_config,
                       "subject_types_supported",
                       sub_types);
  claim_types = json_array ();
  json_array_append_new (claim_types,
                         json_string ("normal"));
  json_array_append_new (claim_types,
                         json_string ("aggregated"));
  json_object_set_new (oidc_config,
                       "claim_types_supported",
                       claim_types);
  json_object_set_new (oidc_config,
                       "claims_parameter_supported",
                       json_boolean (1));
  oidc_config_str = json_dumps (oidc_config, JSON_INDENT (1));
  resp = GNUNET_REST_create_response (oidc_config_str);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  json_decref (oidc_config);
  GNUNET_free (oidc_config_str);
  cleanup_handle (handle);
}
 
 
static void
oidc_config_cors (struct GNUNET_REST_RequestHandle *con_handle,
                  const char *url,
                  void *cls)
{
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  // For now, independent of path return all options
  resp = GNUNET_REST_create_response (NULL);
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          "Access-Control-Allow-Methods",
                                          allow_methods));
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          "Access-Control-Allow-Origin",
                                          "*"));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  cleanup_handle (handle);
  return;
}
 
 
enum GNUNET_GenericReturnValue
REST_openid_process_request (void *plugin,
                             struct GNUNET_REST_RequestHandle *rest_handle,
                             GNUNET_REST_ResultProcessor proc,
                             void *proc_cls)
{
  struct RequestHandle *handle = GNUNET_new (struct RequestHandle);
  struct GNUNET_REST_RequestHandlerError err;
  static const struct GNUNET_REST_RequestHandler handlers[] =
  { { MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_AUTHORIZE, &authorize_endpoint },
    { MHD_HTTP_METHOD_POST,
      GNUNET_REST_API_NS_AUTHORIZE, &authorize_endpoint },   // url-encoded
    { MHD_HTTP_METHOD_POST, GNUNET_REST_API_NS_LOGIN, &login_cont },
    { MHD_HTTP_METHOD_POST, GNUNET_REST_API_NS_TOKEN, &token_endpoint },
    { MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_USERINFO, &userinfo_endpoint },
    { MHD_HTTP_METHOD_POST, GNUNET_REST_API_NS_USERINFO, &userinfo_endpoint },
    { MHD_HTTP_METHOD_GET, GNUNET_REST_API_JWKS, &jwks_endpoint },
    { MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_OIDC_CONFIG,
      &oidc_config_endpoint },
    { MHD_HTTP_METHOD_OPTIONS, GNUNET_REST_API_NS_OIDC_CONFIG,
      &oidc_config_cors },
    { MHD_HTTP_METHOD_OPTIONS, GNUNET_REST_API_NS_OIDC, &options_cont },
    GNUNET_REST_HANDLER_END };
 
  handle->oidc = GNUNET_new (struct OIDC_Variables);
  if (NULL == OIDC_cookie_jar_map)
    OIDC_cookie_jar_map = GNUNET_CONTAINER_multihashmap_create (10,
                                                                GNUNET_NO);
  if (NULL == oidc_code_cache)
    oidc_code_cache = GNUNET_CONTAINER_multihashmap_create (10,
                                                            GNUNET_NO);
 
  handle->response_code = 0;
  handle->timeout = GNUNET_TIME_UNIT_FOREVER_REL;
  handle->proc_cls = proc_cls;
  handle->proc = proc;
  handle->rest_handle = rest_handle;
  handle->url = GNUNET_strdup (rest_handle->url);
  handle->timeout_task =
    GNUNET_SCHEDULER_add_delayed (handle->timeout, &do_timeout, handle);
  GNUNET_CONTAINER_DLL_insert (requests_head,
                               requests_tail,
                               handle);
  if (handle->url[strlen (handle->url) - 1] == '/')
    handle->url[strlen (handle->url) - 1] = '\0';
  if (GNUNET_NO ==
      GNUNET_REST_handle_request (handle->rest_handle, handlers, &err, handle))
    return GNUNET_NO;
 
  return GNUNET_YES;
}
 
 
void *
REST_openid_init (const struct GNUNET_CONFIGURATION_Handle *c)
{
  static struct Plugin plugin;
  struct GNUNET_REST_Plugin *api;
 
  oid_cfg = c;
  if (NULL != plugin.cfg)
    return NULL;     /* can only initialize once! */
  memset (&plugin, 0, sizeof(struct Plugin));
  plugin.cfg = oid_cfg;
  api = GNUNET_new (struct GNUNET_REST_Plugin);
  api->cls = &plugin;
  api->name = GNUNET_REST_API_NS_OIDC;
  identity_handle = GNUNET_IDENTITY_connect (oid_cfg, &list_ego, NULL);
  gns_handle = GNUNET_GNS_connect (oid_cfg);
  idp = GNUNET_RECLAIM_connect (oid_cfg);
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (oid_cfg,
                                                        "reclaim-rest-plugin",
                                                        "OIDC_USERINFO_CONSUME_TIMEOUT",
                                                        &consume_timeout))
  {
    consume_timeout = CONSUME_TIMEOUT;
  }
 
 
  state = ID_REST_STATE_INIT;
  GNUNET_asprintf (&allow_methods,
                   "%s, %s, %s, %s, %s",
                   MHD_HTTP_METHOD_GET,
                   MHD_HTTP_METHOD_POST,
                   MHD_HTTP_METHOD_PUT,
                   MHD_HTTP_METHOD_DELETE,
                   MHD_HTTP_METHOD_OPTIONS);
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              _ ("OpenID Connect REST API initialized\n"));
  return api;
}
 
 
static int
cleanup_hashmap (void *cls, const struct GNUNET_HashCode *key, void *value)
{
  GNUNET_free (value);
  return GNUNET_YES;
}
 
 
void
REST_openid_done (struct GNUNET_REST_Plugin *api)
{
  struct Plugin *plugin = api->cls;
  struct EgoEntry *ego_entry;
 
  plugin->cfg = NULL;
  while (NULL != requests_head)
    cleanup_handle (requests_head);
  if (NULL != OIDC_cookie_jar_map)
  {
    GNUNET_CONTAINER_multihashmap_iterate (OIDC_cookie_jar_map,
                                           &cleanup_hashmap,
                                           NULL);
    GNUNET_CONTAINER_multihashmap_destroy (OIDC_cookie_jar_map);
  }
  if (NULL != oidc_code_cache)
  {
    GNUNET_CONTAINER_multihashmap_iterate (oidc_code_cache,
                                           &cleanup_hashmap,
                                           NULL);
    GNUNET_CONTAINER_multihashmap_destroy (oidc_code_cache);
  }
 
  GNUNET_free (allow_methods);
  if (NULL != gns_handle)
    GNUNET_GNS_disconnect (gns_handle);
  if (NULL != identity_handle)
    GNUNET_IDENTITY_disconnect (identity_handle);
  if (NULL != idp)
    GNUNET_RECLAIM_disconnect (idp);
  while (NULL != (ego_entry = ego_head))
  {
    GNUNET_CONTAINER_DLL_remove (ego_head,
                                 ego_tail,
                                 ego_entry);
    GNUNET_free (ego_entry->identifier);
    GNUNET_free (ego_entry->keystring);
    GNUNET_free (ego_entry);
  }
  GNUNET_free (api);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "OpenID Connect REST plugin is finished\n");
}
 
 
/* end of plugin_rest_openid_connect.c */

Function Documentation

cleanup_handle()

static void cleanup_handle ( struct RequestHandle *  handle )

static

Cleanup lookup handle.

Parameters

handle

Handle to clean up

Definition at line 600 of file openid_plugin.c.

{
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Cleaning up\n");
  if (NULL != handle->timeout_task)
    GNUNET_SCHEDULER_cancel (handle->timeout_task);
  if (NULL != handle->attr_it)
    GNUNET_RECLAIM_get_attributes_stop (handle->attr_it);
  if (NULL != handle->cred_it)
    GNUNET_RECLAIM_get_credentials_stop (handle->cred_it);
  if (NULL != handle->ticket_it)
    GNUNET_RECLAIM_ticket_iteration_stop (handle->ticket_it);
  if (NULL != handle->idp_op)
    GNUNET_RECLAIM_cancel (handle->idp_op);
  if (NULL != handle->consume_timeout_op)
    GNUNET_SCHEDULER_cancel (handle->consume_timeout_op);
  GNUNET_free (handle->url);
  GNUNET_free (handle->tld);
  GNUNET_free (handle->redirect_prefix);
  GNUNET_free (handle->redirect_suffix);
  GNUNET_free (handle->emsg);
  GNUNET_free (handle->edesc);
  if (NULL != handle->gns_op)
    GNUNET_GNS_lookup_cancel (handle->gns_op);
  if (NULL != handle->oidc)
  {
    GNUNET_free (handle->oidc->client_id);
    GNUNET_free (handle->oidc->login_identity);
    GNUNET_free (handle->oidc->nonce);
    GNUNET_free (handle->oidc->redirect_uri);
    GNUNET_free (handle->oidc->response_type);
    GNUNET_free (handle->oidc->scope);
    GNUNET_free (handle->oidc->state);
    if (NULL != handle->oidc->claims)
      GNUNET_free (handle->oidc->claims);
    if (NULL != handle->oidc->code_challenge)
      GNUNET_free (handle->oidc->code_challenge);
    GNUNET_free (handle->oidc);
  }
  if (NULL!=handle->attr_idtoken_list)
    GNUNET_RECLAIM_attribute_list_destroy (handle->attr_idtoken_list);
  if (NULL!=handle->attr_userinfo_list)
    GNUNET_RECLAIM_attribute_list_destroy (handle->attr_userinfo_list);
  if (NULL!=handle->credentials)
    GNUNET_RECLAIM_credential_list_destroy (handle->credentials);
  if (NULL!=handle->presentations)
    GNUNET_RECLAIM_presentation_list_destroy (handle->presentations);
  GNUNET_CONTAINER_DLL_remove (requests_head,
                               requests_tail,
                               handle);
  if (NULL != handle->access_token)
    GNUNET_free (handle->access_token);
  GNUNET_free (handle);
}

References GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_GNS_lookup_cancel(), GNUNET_log, GNUNET_RECLAIM_attribute_list_destroy(), GNUNET_RECLAIM_cancel(), GNUNET_RECLAIM_credential_list_destroy(), GNUNET_RECLAIM_get_attributes_stop(), GNUNET_RECLAIM_get_credentials_stop(), GNUNET_RECLAIM_presentation_list_destroy(), GNUNET_RECLAIM_ticket_iteration_stop(), GNUNET_SCHEDULER_cancel(), handle, requests_head, and requests_tail.

Referenced by build_redirect(), consume_fail(), consume_ticket(), do_error(), do_redirect_error(), do_userinfo_error(), jwks_endpoint(), login_cont(), login_redirect(), oidc_config_cors(), oidc_config_endpoint(), oidc_ticket_issue_cb(), options_cont(), REST_openid_done(), and token_endpoint().

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do_error()

static void do_error ( void *  cls )

static

Task run on error, sends error message.

Cleans up everything.

Parameters

cls	the struct RequestHandle

Definition at line 662 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *json_error;
 
  GNUNET_asprintf (&json_error,
                   "{ \"error\" : \"%s\", \"error_description\" : \"%s\"%s%s%s}",
                   handle->emsg,
                   (NULL != handle->edesc) ? handle->edesc : "",
                   (NULL != handle->oidc->state) ? ", \"state\":\"" : "",
                   (NULL != handle->oidc->state) ? handle->oidc->state : "",
                   (NULL != handle->oidc->state) ? "\"" : "");
  if (0 == handle->response_code)
    handle->response_code = MHD_HTTP_BAD_REQUEST;
  resp = GNUNET_REST_create_response (json_error);
  if (MHD_HTTP_UNAUTHORIZED == handle->response_code)
    GNUNET_assert (MHD_NO !=
                   MHD_add_response_header (resp,
                                            MHD_HTTP_HEADER_WWW_AUTHENTICATE,
                                            "Basic"));
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    MHD_HTTP_HEADER_CONTENT_TYPE,
                                                    "application/json"));
  handle->proc (handle->proc_cls, resp, handle->response_code);
  cleanup_handle (handle);
  GNUNET_free (json_error);
}

References cleanup_handle(), GNUNET_asprintf(), GNUNET_assert, GNUNET_free, GNUNET_REST_create_response(), and handle.

Referenced by authorize_endpoint(), build_authz_response(), consume_fail(), do_timeout(), get_oidc_dir_path(), login_redirect(), oidc_iteration_error(), and token_endpoint().

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do_userinfo_error()

static void do_userinfo_error ( void *  cls )

static

Task run on error in userinfo endpoint, sends error header.

Cleans up everything

Parameters

cls	the struct RequestHandle

Definition at line 699 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *error;
 
  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
              "Error: %s\n", handle->edesc);
  GNUNET_asprintf (&error,
                   "error=\"%s\", error_description=\"%s\"",
                   handle->emsg,
                   (NULL != handle->edesc) ? handle->edesc : "");
  resp = GNUNET_REST_create_response ("");
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          MHD_HTTP_HEADER_WWW_AUTHENTICATE,
                                          "Bearer"));
  handle->proc (handle->proc_cls, resp, handle->response_code);
  cleanup_handle (handle);
  GNUNET_free (error);
}

References cleanup_handle(), GNUNET_asprintf(), GNUNET_assert, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_REST_create_response(), and handle.

Referenced by consume_fail(), and userinfo_endpoint().

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do_redirect_error()

static void do_redirect_error ( void *  cls )

static

Task run on error, sends error message and redirects.

Cleans up everything.

Parameters

cls	the struct RequestHandle

Definition at line 728 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *redirect;
 
  GNUNET_asprintf (&redirect,
                   "%s?error=%s&error_description=%s%s%s",
                   handle->oidc->redirect_uri,
                   handle->emsg,
                   handle->edesc,
                   (NULL != handle->oidc->state) ? "&state=" : "",
                   (NULL != handle->oidc->state) ? handle->oidc->state : "");
  resp = GNUNET_REST_create_response ("");
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Location", redirect));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
  cleanup_handle (handle);
  GNUNET_free (redirect);
}

References cleanup_handle(), GNUNET_asprintf(), GNUNET_assert, GNUNET_free, GNUNET_REST_create_response(), and handle.

Referenced by build_authz_response(), code_redirect(), lookup_redirect_uri_result(), oidc_attr_collect_finished_cb(), and oidc_ticket_issue_cb().

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do_timeout()

static void do_timeout ( void *  cls )

static

Task run on timeout, sends error message.

Cleans up everything.

Parameters

cls	the struct RequestHandle

Definition at line 756 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
 
  handle->timeout_task = NULL;
  do_error (handle);
}

References do_error(), and handle.

Referenced by REST_openid_process_request().

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options_cont()

static void options_cont ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Respond to OPTIONS request.

Parameters

con_handle	the connection handle
url	the url
cls	the RequestHandle

Definition at line 773 of file openid_plugin.c.

{
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  // For now, independent of path return all options
  resp = GNUNET_REST_create_response (NULL);
  MHD_add_response_header (resp, "Access-Control-Allow-Methods", allow_methods);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  cleanup_handle (handle);
  return;
}

References allow_methods, cleanup_handle(), GNUNET_REST_create_response(), and handle.

Referenced by REST_openid_process_request().

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cookie_identity_interpretation()

static void cookie_identity_interpretation ( struct RequestHandle *  handle )

static

Interprets cookie header and pass its identity keystring to handle.

Definition at line 793 of file openid_plugin.c.

{
  struct GNUNET_HashCode cache_key;
  char *cookies;
  struct GNUNET_TIME_Absolute current_time, *relog_time;
  char delimiter[] = "; ";
  char *tmp_cookies;
  char *token;
  char *value;
 
  // gets identity of login try with cookie
  GNUNET_CRYPTO_hash (OIDC_COOKIE_HEADER_KEY,
                      strlen (OIDC_COOKIE_HEADER_KEY),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->header_param_map,
                                                           &cache_key))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No cookie found\n");
    return;
  }
  // splits cookies and find 'Identity' cookie
  tmp_cookies =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->header_param_map,
                                       &cache_key);
  cookies = GNUNET_strdup (tmp_cookies);
  token = strtok (cookies, delimiter);
  handle->oidc->user_cancelled = GNUNET_NO;
  handle->oidc->login_identity = NULL;
  if (NULL == token)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unable to parse cookie: %s\n",
                cookies);
    GNUNET_free (cookies);
    return;
  }
 
  while (NULL != token)
  {
    if (0 == strcmp (token, OIDC_COOKIE_HEADER_ACCESS_DENIED))
    {
      handle->oidc->user_cancelled = GNUNET_YES;
      GNUNET_free (cookies);
      return;
    }
    if (NULL != strstr (token, OIDC_COOKIE_HEADER_INFORMATION_KEY))
      break;
    token = strtok (NULL, delimiter);
  }
  if (NULL == token)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "No cookie value to process: %s\n",
                cookies);
    GNUNET_free (cookies);
    return;
  }
  GNUNET_CRYPTO_hash (token, strlen (token), &cache_key);
  if (GNUNET_NO ==
      GNUNET_CONTAINER_multihashmap_contains (OIDC_cookie_jar_map, &cache_key))
  {
    GNUNET_log (
      GNUNET_ERROR_TYPE_WARNING,
      "Found cookie `%s', but no corresponding expiration entry present...\n",
      token);
    GNUNET_free (cookies);
    return;
  }
  relog_time =
    GNUNET_CONTAINER_multihashmap_get (OIDC_cookie_jar_map, &cache_key);
  current_time = GNUNET_TIME_absolute_get ();
  // 30 min after old login -> redirect to login
  if (current_time.abs_value_us > relog_time->abs_value_us)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Found cookie `%s', but it is expired.\n",
                token);
    GNUNET_free (cookies);
    return;
  }
  value = strtok (token, OIDC_COOKIE_HEADER_INFORMATION_KEY);
  GNUNET_assert (NULL != value);
  handle->oidc->login_identity = GNUNET_strdup (value);
  GNUNET_free (cookies);
}

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_assert, GNUNET_CONTAINER_multihashmap_contains(), GNUNET_CONTAINER_multihashmap_get(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_NO, GNUNET_strdup, GNUNET_TIME_absolute_get(), GNUNET_YES, handle, OIDC_COOKIE_HEADER_ACCESS_DENIED, OIDC_COOKIE_HEADER_INFORMATION_KEY, OIDC_COOKIE_HEADER_KEY, OIDC_cookie_jar_map, and value.

Referenced by authorize_endpoint().

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read_jwk_from_file()

static json_t * read_jwk_from_file ( const char *  filename )

static

Read the the JSON Web Key in the given file and return it.

Return NULL and emit warning if JSON can not be decoded or the key is invalid

Parameters

filename

the file to read the JWK from

Returns

json_t* the reed JWK

Definition at line 890 of file openid_plugin.c.

{
  json_t *jwk;
  json_error_t error;
 
  jwk = json_load_file (filename, JSON_DECODE_ANY, &error);
 
  if (! jwk)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                ("Could not read OIDC RSA key from config file; %s\n"),
                error.text);
  }
 
  return jwk;
}

References filename, GNUNET_ERROR_TYPE_WARNING, and GNUNET_log.

Referenced by jwks_endpoint(), and token_endpoint().

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write_jwk_to_file()

static int write_jwk_to_file ( const char *  filename, json_t *  jwk  )

static

Write the JWK to file.

If unsuccessful emit warning

Parameters

filename	the name of the file the JWK is written to
jwk	the JWK that is going to be written

Returns

int Return GNUNET_OK if write is successful

Definition at line 916 of file openid_plugin.c.

{
  if (json_dump_file (jwk, filename, JSON_INDENT (2)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                ("Could not write OIDC RSA key to file %s\n"),
                filename);
    return GNUNET_ERROR_TYPE_WARNING;
  }
  else
    return GNUNET_OK;
}

References filename, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, and GNUNET_OK.

Referenced by jwks_endpoint(), and token_endpoint().

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generate_jwk()

static json_t * generate_jwk ( )

static

Generate a new RSA JSON Web Key.

Returns

json_t* the generated JWK

Definition at line 937 of file openid_plugin.c.

{
  json_t *jwk;
  jwk = json_pack ("{s:s,s:i}", "kty", "RSA", "bits", 2048);
  jose_jwk_gen (NULL, jwk);
  json_incref (jwk);
  return jwk;
}

Referenced by jwks_endpoint(), and token_endpoint().

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get_oidc_dir_path()

static char * get_oidc_dir_path ( void *  cls )

static

Return the path to the oidc directory path.

Parameters

cls	the RequestHandle

Definition at line 953 of file openid_plugin.c.

{
  char *oidc_directory;
  struct RequestHandle *handle = cls;
 
  // Read OIDC directory from config
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (oid_cfg,
                                                            "reclaim-rest-plugin",
                                                            "oidc_dir",
                                                            &oidc_directory))
  {
    // Could not read Config file
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return NULL;
  }
 
  return oidc_directory;
}

References do_error(), GNUNET_CONFIGURATION_get_value_filename(), GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, handle, oid_cfg, and OIDC_ERROR_KEY_SERVER_ERROR.

Referenced by get_oidc_jwk_path(), jwks_endpoint(), and token_endpoint().

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get_oidc_jwk_path()

static char * get_oidc_jwk_path ( void *  cls )

static

Return the path to the RSA JWK key file.

Parameters

cls	the RequestHandle

Definition at line 982 of file openid_plugin.c.

{
  char *oidc_directory;
  char *oidc_jwk_path;
 
  oidc_directory = get_oidc_dir_path (cls);
 
  // Create path to file
  GNUNET_asprintf (&oidc_jwk_path, "%s/%s", oidc_directory,
                   OIDC_JWK_RSA_FILENAME);
 
  return oidc_jwk_path;
}

References get_oidc_dir_path(), GNUNET_asprintf(), and OIDC_JWK_RSA_FILENAME.

Referenced by jwks_endpoint(), and token_endpoint().

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login_redirect()

static void login_redirect ( void *  cls )

static

Redirects to login page stored in configuration file.

Definition at line 1001 of file openid_plugin.c.

{
  char *login_base_url;
  char *new_redirect;
  char *tmp;
  struct MHD_Response *resp;
  struct GNUNET_Buffer buf = { 0 };
  struct RequestHandle *handle = cls;
 
  if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                          "reclaim-rest-plugin",
                                                          "address",
                                                          &login_base_url))
  {
    GNUNET_buffer_write_str (&buf, login_base_url);
    GNUNET_buffer_write_fstr (&buf,
                              "?%s=%s",
                              OIDC_RESPONSE_TYPE_KEY,
                              handle->oidc->response_type);
    GNUNET_buffer_write_fstr (&buf,
                              "&%s=%s",
                              OIDC_CLIENT_ID_KEY,
                              handle->oidc->client_id);
    GNUNET_STRINGS_urlencode (strlen (handle->oidc->redirect_uri),
                              handle->oidc->redirect_uri,
                              &tmp);
    GNUNET_buffer_write_fstr (&buf,
                              "&%s=%s",
                              OIDC_REDIRECT_URI_KEY,
                              tmp);
    GNUNET_free (tmp);
    GNUNET_STRINGS_urlencode (strlen (handle->oidc->scope),
                              handle->oidc->scope,
                              &tmp);
    GNUNET_buffer_write_fstr (&buf,
                              "&%s=%s",
                              OIDC_SCOPE_KEY,
                              tmp);
    GNUNET_free (tmp);
    if (NULL != handle->oidc->state)
    {
      GNUNET_STRINGS_urlencode (strlen (handle->oidc->state),
                                handle->oidc->state,
                                &tmp);
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_STATE_KEY,
                                handle->oidc->state);
      GNUNET_free (tmp);
    }
    if (NULL != handle->oidc->code_challenge)
    {
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_CODE_CHALLENGE_KEY,
                                handle->oidc->code_challenge);
    }
    if (NULL != handle->oidc->nonce)
    {
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_NONCE_KEY,
                                handle->oidc->nonce);
    }
    if (NULL != handle->oidc->claims)
    {
      GNUNET_STRINGS_urlencode (strlen (handle->oidc->claims),
                                handle->oidc->claims,
                                &tmp);
      GNUNET_buffer_write_fstr (&buf,
                                "&%s=%s",
                                OIDC_CLAIMS_KEY,
                                tmp);
      GNUNET_free (tmp);
    }
    new_redirect = GNUNET_buffer_reap_str (&buf);
    resp = GNUNET_REST_create_response ("");
    MHD_add_response_header (resp, "Location", new_redirect);
    GNUNET_free (login_base_url);
  }
  else
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
  GNUNET_free (new_redirect);
  cleanup_handle (handle);
}

References cleanup_handle(), do_error(), GNUNET_buffer_reap_str(), GNUNET_buffer_write_fstr(), GNUNET_buffer_write_str(), GNUNET_CONFIGURATION_get_value_string(), GNUNET_free, GNUNET_OK, GNUNET_REST_create_response(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_STRINGS_urlencode(), handle, oid_cfg, OIDC_CLAIMS_KEY, OIDC_CLIENT_ID_KEY, OIDC_CODE_CHALLENGE_KEY, OIDC_ERROR_KEY_SERVER_ERROR, OIDC_NONCE_KEY, OIDC_REDIRECT_URI_KEY, OIDC_RESPONSE_TYPE_KEY, OIDC_SCOPE_KEY, and OIDC_STATE_KEY.

Referenced by build_authz_response(), and code_redirect().

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oidc_iteration_error()

static void oidc_iteration_error ( void *  cls )

static

Does internal server error when iteration failed.

Definition at line 1099 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
 
  handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
  handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
  GNUNET_SCHEDULER_add_now (&do_error, handle);
}

References do_error(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, handle, and OIDC_ERROR_KEY_SERVER_ERROR.

Referenced by code_redirect(), and oidc_attr_collect_finished_cb().

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oidc_ticket_issue_cb()

static void oidc_ticket_issue_cb ( void *  cls, const struct GNUNET_RECLAIM_Ticket *  ticket, const struct GNUNET_RECLAIM_PresentationList *  presentation  )

static

Issues ticket and redirects to relying party with the authorization code as parameter.

Otherwise redirects with error

Definition at line 1114 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *ticket_str;
  char *redirect_uri;
  char *code_string;
 
  handle->idp_op = NULL;
  if (NULL == ticket)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("Server cannot generate ticket.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
  handle->ticket = *ticket;
  ticket_str =
    GNUNET_STRINGS_data_to_string_alloc (&handle->ticket,
                                         sizeof(struct GNUNET_RECLAIM_Ticket));
  code_string = OIDC_build_authz_code (&handle->priv_key,
                                       &handle->ticket,
                                       handle->attr_idtoken_list,
                                       presentation,
                                       handle->oidc->nonce,
                                       handle->oidc->code_challenge);
  if ((NULL != handle->redirect_prefix) && (NULL != handle->redirect_suffix) &&
      (NULL != handle->tld))
  {
    GNUNET_asprintf (&redirect_uri,
                     "%s.%s/%s%s%s=%s&state=%s",
                     handle->redirect_prefix,
                     handle->tld,
                     handle->redirect_suffix,
                     (NULL == strchr (handle->redirect_suffix, '?') ? "?" :
                      "&"),
                     handle->oidc->response_type,
                     code_string,
                     handle->oidc->state);
  }
  else
  {
    GNUNET_asprintf (&redirect_uri,
                     "%s%s%s=%s&state=%s",
                     handle->oidc->redirect_uri,
                     (NULL == strchr (handle->oidc->redirect_uri, '?') ? "?" :
                      "&"),
                     handle->oidc->response_type,
                     code_string,
                     handle->oidc->state);
  }
  resp = GNUNET_REST_create_response ("");
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Location", redirect_uri));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
  cleanup_handle (handle);
  GNUNET_free (redirect_uri);
  GNUNET_free (ticket_str);
  GNUNET_free (code_string);
}

References cleanup_handle(), do_redirect_error(), GNUNET_asprintf(), GNUNET_assert, GNUNET_free, GNUNET_REST_create_response(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_STRINGS_data_to_string_alloc(), handle, OIDC_build_authz_code(), OIDC_ERROR_KEY_SERVER_ERROR, and ticket.

Referenced by oidc_cred_collect_finished_cb().

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attribute_list_merge()

static struct GNUNET_RECLAIM_AttributeList * attribute_list_merge ( struct GNUNET_RECLAIM_AttributeList *  list_a, struct GNUNET_RECLAIM_AttributeList *  list_b  )

static

Attribute already in list

Attribute already in list

Definition at line 1180 of file openid_plugin.c.

{
  struct GNUNET_RECLAIM_AttributeList *merged_list;
  struct GNUNET_RECLAIM_AttributeListEntry *le_a;
  struct GNUNET_RECLAIM_AttributeListEntry *le_b;
  struct GNUNET_RECLAIM_AttributeListEntry *le_m;
 
  merged_list = GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
  for (le_a = list_a->list_head; NULL != le_a; le_a = le_a->next)
  {
    le_m = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le_m->attribute = GNUNET_RECLAIM_attribute_new (le_a->attribute->name,
                                                    &le_a->attribute->
                                                    credential,
                                                    le_a->attribute->type,
                                                    le_a->attribute->data,
                                                    le_a->attribute->data_size);
    le_m->attribute->id = le_a->attribute->id;
    le_m->attribute->flag = le_a->attribute->flag;
    le_m->attribute->credential = le_a->attribute->credential;
    GNUNET_CONTAINER_DLL_insert (merged_list->list_head,
                                 merged_list->list_tail,
                                 le_m);
  }
  le_m = NULL;
  for (le_b = list_b->list_head; NULL != le_b; le_b = le_b->next)
  {
    for (le_m = merged_list->list_head; NULL != le_m; le_m = le_m->next)
    {
      if (GNUNET_YES == GNUNET_RECLAIM_id_is_equal (&le_m->attribute->id,
                                                    &le_b->attribute->id))
        break; 
    }
    if (NULL != le_m)
      continue; 
    le_m = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le_m->attribute = GNUNET_RECLAIM_attribute_new (le_b->attribute->name,
                                                    &le_b->attribute->
                                                    credential,
                                                    le_b->attribute->type,
                                                    le_b->attribute->data,
                                                    le_b->attribute->data_size);
    le_m->attribute->id = le_b->attribute->id;
    le_m->attribute->flag = le_b->attribute->flag;
    le_m->attribute->credential = le_b->attribute->credential;
    GNUNET_CONTAINER_DLL_insert (merged_list->list_head,
                                 merged_list->list_tail,
                                 le_m);
  }
  return merged_list;
}

References GNUNET_RECLAIM_AttributeListEntry::attribute, credential, GNUNET_RECLAIM_Attribute::credential, GNUNET_RECLAIM_Attribute::data, GNUNET_RECLAIM_Attribute::data_size, GNUNET_RECLAIM_Attribute::flag, GNUNET_CONTAINER_DLL_insert, GNUNET_new, GNUNET_RECLAIM_attribute_new(), GNUNET_RECLAIM_id_is_equal, GNUNET_YES, GNUNET_RECLAIM_Attribute::id, GNUNET_RECLAIM_AttributeList::list_head, GNUNET_RECLAIM_AttributeList::list_tail, GNUNET_RECLAIM_Attribute::name, GNUNET_RECLAIM_AttributeListEntry::next, and GNUNET_RECLAIM_Attribute::type.

Referenced by oidc_cred_collect_finished_cb().

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oidc_cred_collect_finished_cb()

static void oidc_cred_collect_finished_cb ( void *  cls )

static

Definition at line 1235 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeList *merged_list;
  struct GNUNET_RECLAIM_AttributeListEntry *le_m;
 
  handle->cred_it = NULL;
  merged_list = attribute_list_merge (handle->attr_idtoken_list,
                                      handle->attr_userinfo_list);
  for (le_m = merged_list->list_head; NULL != le_m; le_m = le_m->next)
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "List Attribute in ticket to issue: %s\n",
                le_m->attribute->name);
  handle->idp_op = GNUNET_RECLAIM_ticket_issue (idp,
                                                &handle->priv_key,
                                                handle->oidc->client_id,
                                                merged_list,
                                                &oidc_ticket_issue_cb,
                                                handle);
  GNUNET_RECLAIM_attribute_list_destroy (merged_list);
}

References GNUNET_RECLAIM_AttributeListEntry::attribute, attribute_list_merge(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_RECLAIM_attribute_list_destroy(), GNUNET_RECLAIM_ticket_issue(), handle, idp, GNUNET_RECLAIM_AttributeList::list_head, GNUNET_RECLAIM_Attribute::name, GNUNET_RECLAIM_AttributeListEntry::next, and oidc_ticket_issue_cb().

Referenced by oidc_attr_collect_finished_cb().

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oidc_cred_collect()

static void oidc_cred_collect ( void *  cls, const struct GNUNET_CRYPTO_BlindablePublicKey *  identity, const struct GNUNET_RECLAIM_Credential *  cred  )

static

Collects all attributes for an ego if in scope parameter.

Credential already in list

Credential matches for attribute, add

Definition at line 1262 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeListEntry *le;
  struct GNUNET_RECLAIM_CredentialListEntry *ale;
 
  for (ale = handle->credentials->list_head; NULL != ale; ale = ale->next)
  {
    if (GNUNET_NO == GNUNET_RECLAIM_id_is_equal (&ale->credential->id,
                                                 &cred->id))
      continue;
    GNUNET_RECLAIM_get_credentials_next (handle->cred_it);
    return;
  }
 
  for (le = handle->attr_idtoken_list->list_head; NULL != le; le = le->next)
  {
    if (GNUNET_NO == GNUNET_RECLAIM_id_is_equal (&le->attribute->credential,
                                                 &cred->id))
      continue;
    ale = GNUNET_new (struct GNUNET_RECLAIM_CredentialListEntry);
    ale->credential = GNUNET_RECLAIM_credential_new (cred->name,
                                                     cred->type,
                                                     cred->data,
                                                     cred->data_size);
    GNUNET_CONTAINER_DLL_insert (handle->credentials->list_head,
                                 handle->credentials->list_tail,
                                 ale);
  }
  GNUNET_RECLAIM_get_credentials_next (handle->cred_it);
}

References GNUNET_RECLAIM_AttributeListEntry::attribute, cred, GNUNET_RECLAIM_Attribute::credential, GNUNET_RECLAIM_CredentialListEntry::credential, GNUNET_CONTAINER_DLL_insert, GNUNET_new, GNUNET_NO, GNUNET_RECLAIM_credential_new(), GNUNET_RECLAIM_get_credentials_next(), GNUNET_RECLAIM_id_is_equal, handle, GNUNET_RECLAIM_Identifier::id, GNUNET_RECLAIM_Credential::id, GNUNET_RECLAIM_AttributeListEntry::next, and GNUNET_RECLAIM_CredentialListEntry::next.

Referenced by oidc_attr_collect_finished_cb().

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oidc_attr_collect_finished_cb()

static void oidc_attr_collect_finished_cb ( void *  cls )

static

Definition at line 1300 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
 
  handle->attr_it = NULL;
  handle->ticket_it = NULL;
  if (NULL == handle->attr_idtoken_list->list_head)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_SCOPE);
    handle->edesc = GNUNET_strdup ("The requested scope is not available.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
  handle->credentials = GNUNET_new (struct GNUNET_RECLAIM_CredentialList);
  handle->cred_it =
    GNUNET_RECLAIM_get_credentials_start (idp,
                                          &handle->priv_key,
                                          &oidc_iteration_error,
                                          handle,
                                          &oidc_cred_collect,
                                          handle,
                                          &oidc_cred_collect_finished_cb,
                                          handle);
 
}

References do_redirect_error(), GNUNET_new, GNUNET_RECLAIM_get_credentials_start(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, handle, idp, oidc_cred_collect(), oidc_cred_collect_finished_cb(), OIDC_ERROR_KEY_INVALID_SCOPE, and oidc_iteration_error().

Referenced by code_redirect().

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attr_in_claims_request()

static int attr_in_claims_request ( struct RequestHandle *  handle, const char *  attr_name, const char *  claims_parameter  )

static

Check if attribute is requested through a scope

Try claims parameter if not in scope

Definition at line 1328 of file openid_plugin.c.

{
  int ret = GNUNET_NO;
  json_t *root;
  json_error_t error;
  json_t *claims_j;
  const char *key;
  json_t *value;
 
  if (GNUNET_YES == OIDC_check_scopes_for_claim_request (handle->oidc->scope,
                                                         attr_name))
    return GNUNET_YES;
 
  if (NULL != handle->oidc->claims)
  {
    root = json_loads (handle->oidc->claims, JSON_DECODE_ANY, &error);
    claims_j = json_object_get (root, claims_parameter);
    /* obj is a JSON object */
    if (NULL != claims_j)
    {
      json_object_foreach (claims_j, key, value) {
        if (0 != strcmp (attr_name, key))
          continue;
        ret = GNUNET_YES;
        break;
      }
    }
    json_decref (root);
  }
  return ret;
}

References attr_name, GNUNET_NO, GNUNET_YES, handle, key, OIDC_check_scopes_for_claim_request(), ret, and value.

Referenced by attr_in_idtoken_request(), and attr_in_userinfo_request().

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attr_in_idtoken_request()

static int attr_in_idtoken_request ( struct RequestHandle *  handle, const char *  attr_name  )

static

Definition at line 1366 of file openid_plugin.c.

{
  return attr_in_claims_request (handle, attr_name, "id_token");
}

References attr_in_claims_request(), attr_name, and handle.

Referenced by oidc_attr_collect().

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attr_in_userinfo_request()

static int attr_in_userinfo_request ( struct RequestHandle *  handle, const char *  attr_name  )

static

Definition at line 1374 of file openid_plugin.c.

{
  return attr_in_claims_request (handle, attr_name, "userinfo");
}

References attr_in_claims_request(), attr_name, and handle.

Referenced by oidc_attr_collect().

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oidc_attr_collect()

static void oidc_attr_collect ( void *  cls, const struct GNUNET_CRYPTO_BlindablePublicKey *  identity, const struct GNUNET_RECLAIM_Attribute *  attr  )

static

Collects all attributes for an ego if in scope parameter.

Definition at line 1385 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeListEntry *le;
  if (GNUNET_YES == attr_in_idtoken_request (handle, attr->name))
  {
    le = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le->attribute = GNUNET_RECLAIM_attribute_new (attr->name,
                                                  &attr->credential,
                                                  attr->type,
                                                  attr->data,
                                                  attr->data_size);
    le->attribute->id = attr->id;
    le->attribute->flag = attr->flag;
    le->attribute->credential = attr->credential;
    GNUNET_CONTAINER_DLL_insert (handle->attr_idtoken_list->list_head,
                                 handle->attr_idtoken_list->list_tail,
                                 le);
  }
  if (GNUNET_YES == attr_in_userinfo_request (handle, attr->name))
  {
    le = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
    le->attribute = GNUNET_RECLAIM_attribute_new (attr->name,
                                                  &attr->credential,
                                                  attr->type,
                                                  attr->data,
                                                  attr->data_size);
    le->attribute->id = attr->id;
    le->attribute->flag = attr->flag;
    le->attribute->credential = attr->credential;
    GNUNET_CONTAINER_DLL_insert (handle->attr_userinfo_list->list_head,
                                 handle->attr_userinfo_list->list_tail,
                                 le);
  }
 
  GNUNET_RECLAIM_get_attributes_next (handle->attr_it);
}

References attr_in_idtoken_request(), attr_in_userinfo_request(), GNUNET_RECLAIM_AttributeListEntry::attribute, GNUNET_RECLAIM_Attribute::credential, GNUNET_RECLAIM_Attribute::data, GNUNET_RECLAIM_Attribute::data_size, GNUNET_RECLAIM_Attribute::flag, GNUNET_CONTAINER_DLL_insert, GNUNET_new, GNUNET_RECLAIM_attribute_new(), GNUNET_RECLAIM_get_attributes_next(), GNUNET_YES, handle, GNUNET_RECLAIM_Attribute::id, GNUNET_RECLAIM_Attribute::name, and GNUNET_RECLAIM_Attribute::type.

Referenced by code_redirect().

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code_redirect()

static void code_redirect ( void *  cls )

static

Checks time and cookie and redirects accordingly.

Definition at line 1430 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_TIME_Absolute current_time;
  struct GNUNET_TIME_Absolute *relog_time;
  struct GNUNET_CRYPTO_BlindablePublicKey pubkey;
  struct GNUNET_CRYPTO_BlindablePublicKey ego_pkey;
  struct GNUNET_HashCode cache_key;
  char *identity_cookie;
 
  GNUNET_asprintf (&identity_cookie,
                   "Identity=%s",
                   handle->oidc->login_identity);
  GNUNET_CRYPTO_hash (identity_cookie, strlen (identity_cookie), &cache_key);
  GNUNET_free (identity_cookie);
  // No login time for identity -> redirect to login
  if (GNUNET_YES ==
      GNUNET_CONTAINER_multihashmap_contains (OIDC_cookie_jar_map, &cache_key))
  {
    relog_time =
      GNUNET_CONTAINER_multihashmap_get (OIDC_cookie_jar_map, &cache_key);
    current_time = GNUNET_TIME_absolute_get ();
    // 30 min after old login -> redirect to login
    if (current_time.abs_value_us <= relog_time->abs_value_us)
    {
      if (GNUNET_OK !=
          GNUNET_CRYPTO_blindable_public_key_from_string (handle->oidc
                                                          ->login_identity,
                                                          &pubkey))
      {
        handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_COOKIE);
        handle->edesc =
          GNUNET_strdup ("The cookie of a login identity is not valid");
        GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
        return;
      }
      // iterate over egos and compare their public key
      for (handle->ego_entry = ego_head; NULL != handle->ego_entry;
           handle->ego_entry = handle->ego_entry->next)
      {
        GNUNET_IDENTITY_ego_get_public_key (handle->ego_entry->ego, &ego_pkey);
        if (0 == GNUNET_memcmp (&ego_pkey, &pubkey))
        {
          handle->priv_key =
            *GNUNET_IDENTITY_ego_get_private_key (handle->ego_entry->ego);
          handle->attr_idtoken_list =
            GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
          handle->attr_userinfo_list =
            GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
          handle->attr_it =
            GNUNET_RECLAIM_get_attributes_start (idp,
                                                 &handle->priv_key,
                                                 &oidc_iteration_error,
                                                 handle,
                                                 &oidc_attr_collect,
                                                 handle,
                                                 &oidc_attr_collect_finished_cb,
                                                 handle);
          return;
        }
      }
      GNUNET_SCHEDULER_add_now (&login_redirect, handle);
      return;
    }
  }
}

References GNUNET_TIME_Absolute::abs_value_us, do_redirect_error(), ego_head, GNUNET_asprintf(), GNUNET_CONTAINER_multihashmap_contains(), GNUNET_CONTAINER_multihashmap_get(), GNUNET_CRYPTO_blindable_public_key_from_string(), GNUNET_CRYPTO_hash(), GNUNET_free, GNUNET_IDENTITY_ego_get_private_key(), GNUNET_IDENTITY_ego_get_public_key(), GNUNET_memcmp, GNUNET_new, GNUNET_OK, GNUNET_RECLAIM_get_attributes_start(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_TIME_absolute_get(), GNUNET_YES, handle, idp, login_redirect(), oidc_attr_collect(), oidc_attr_collect_finished_cb(), OIDC_cookie_jar_map, OIDC_ERROR_KEY_INVALID_COOKIE, oidc_iteration_error(), and pubkey.

Referenced by build_redirect().

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build_redirect()

static void build_redirect ( void *  cls )

static

Definition at line 1499 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct MHD_Response *resp;
  char *redirect_uri;
 
  if (GNUNET_YES == handle->oidc->user_cancelled)
  {
    if ((NULL != handle->redirect_prefix) &&
        (NULL != handle->redirect_suffix) && (NULL != handle->tld))
    {
      GNUNET_asprintf (&redirect_uri,
                       "%s.%s/%s?error=%s&error_description=%s&state=%s",
                       handle->redirect_prefix,
                       handle->tld,
                       handle->redirect_suffix,
                       "access_denied",
                       "User denied access",
                       handle->oidc->state);
    }
    else
    {
      GNUNET_asprintf (&redirect_uri,
                       "%s?error=%s&error_description=%s&state=%s",
                       handle->oidc->redirect_uri,
                       "access_denied",
                       "User denied access",
                       handle->oidc->state);
    }
    resp = GNUNET_REST_create_response ("");
    GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                      "Location",
                                                      redirect_uri));
    handle->proc (handle->proc_cls, resp, MHD_HTTP_FOUND);
    cleanup_handle (handle);
    GNUNET_free (redirect_uri);
    return;
  }
  GNUNET_SCHEDULER_add_now (&code_redirect, handle);
}

References cleanup_handle(), code_redirect(), GNUNET_asprintf(), GNUNET_assert, GNUNET_free, GNUNET_REST_create_response(), GNUNET_SCHEDULER_add_now(), GNUNET_YES, and handle.

Referenced by lookup_redirect_uri_result().

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lookup_redirect_uri_result()

static void lookup_redirect_uri_result ( void *  cls, uint32_t  rd_count, const struct GNUNET_GNSRECORD_Data *  rd  )

static

Definition at line 1542 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  char *tmp;
  char *tmp_key_str;
  char *pos;
  struct GNUNET_CRYPTO_BlindablePublicKey redirect_zone;
 
  handle->gns_op = NULL;
  if (0 == rd_count)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc =
      GNUNET_strdup ("Server cannot generate ticket, redirect uri not found.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
  for (int i = 0; i < rd_count; i++)
  {
    if (GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_REDIRECT != rd[i].record_type)
      continue;
    if (0 != strncmp (rd[i].data, handle->oidc->redirect_uri, rd[i].data_size))
      continue;
    tmp = GNUNET_strndup (rd[i].data, rd[i].data_size);
    if (NULL == strstr (tmp, handle->oidc->client_id))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Redirect uri %s does not contain client_id %s\n",
                  tmp,
                  handle->oidc->client_id);
    }
    else
    {
      pos = strrchr (tmp, (unsigned char) '.');
      if (NULL == pos)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Redirect uri %s contains client_id but is malformed\n",
                    tmp);
        GNUNET_free (tmp);
        continue;
      }
      *pos = '\0';
      handle->redirect_prefix = GNUNET_strdup (tmp);
      tmp_key_str = pos + 1;
      pos = strchr (tmp_key_str, (unsigned char) '/');
      if (NULL == pos)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Redirect uri %s contains client_id but is malformed\n",
                    tmp);
        GNUNET_free (tmp);
        continue;
      }
      *pos = '\0';
      handle->redirect_suffix = GNUNET_strdup (pos + 1);
 
      GNUNET_STRINGS_string_to_data (tmp_key_str,
                                     strlen (tmp_key_str),
                                     &redirect_zone,
                                     sizeof(redirect_zone));
    }
    GNUNET_SCHEDULER_add_now (&build_redirect, handle);
    GNUNET_free (tmp);
    return;
  }
  handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
  handle->edesc =
    GNUNET_strdup ("Server cannot generate ticket, redirect uri not found.");
  GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
}

References build_redirect(), data, data_size, GNUNET_GNSRECORD_Data::data_size, do_redirect_error(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_REDIRECT, GNUNET_log, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_STRINGS_string_to_data(), GNUNET_strndup, handle, OIDC_ERROR_KEY_SERVER_ERROR, rd, and rd_count.

Referenced by client_redirect().

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client_redirect()

static void client_redirect ( void *  cls )

static

Initiate redirect back to client.

Definition at line 1621 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
 
  /* Lookup client redirect uri to verify request */
  handle->gns_op =
    GNUNET_GNS_lookup (gns_handle,
                       GNUNET_GNS_EMPTY_LABEL_AT,
                       &handle->oidc->client_pkey,
                       GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_REDIRECT,
                       GNUNET_GNS_LO_DEFAULT,
                       &lookup_redirect_uri_result,
                       handle);
}

References gns_handle, GNUNET_GNS_EMPTY_LABEL_AT, GNUNET_GNS_LO_DEFAULT, GNUNET_GNS_lookup(), GNUNET_GNSRECORD_TYPE_RECLAIM_OIDC_REDIRECT, handle, and lookup_redirect_uri_result().

Referenced by build_authz_response().

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get_url_parameter_copy()

static char * get_url_parameter_copy ( const struct RequestHandle *  handle, const char *  key  )

static

Definition at line 1638 of file openid_plugin.c.

{
  struct GNUNET_HashCode hc;
  char *value;
  char *res;
 
  GNUNET_CRYPTO_hash (key, strlen (key), &hc);
  if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                            ->url_param_map,
                                                            &hc))
    return NULL;
  value =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->url_param_map, &hc);
  if (NULL == value)
    return NULL;
  GNUNET_STRINGS_urldecode (value, strlen (value), &res);
  return res;
}

References GNUNET_CONTAINER_multihashmap_contains(), GNUNET_CONTAINER_multihashmap_get(), GNUNET_CRYPTO_hash(), GNUNET_STRINGS_urldecode(), GNUNET_YES, handle, key, res, and value.

Referenced by authorize_endpoint(), build_authz_response(), check_authorization(), consume_fail(), and token_endpoint().

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build_authz_response()

static void build_authz_response ( void *  cls )

static

Iteration over all results finished, build final response.

Parameters

cls	the struct RequestHandle

Definition at line 1665 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_HashCode cache_key;
 
  char *expected_scope;
  char delimiter[] = " ";
  char *test;
  int number_of_ignored_parameter, iterator;
 
 
  // REQUIRED value: redirect_uri
  handle->oidc->redirect_uri =
    get_url_parameter_copy (handle, OIDC_REDIRECT_URI_KEY);
  if (NULL == handle->oidc->redirect_uri)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter redirect_uri");
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // REQUIRED value: response_type
  handle->oidc->response_type =
    get_url_parameter_copy (handle, OIDC_RESPONSE_TYPE_KEY);
  if (NULL == handle->oidc->response_type)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter response_type");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
 
  // REQUIRED value: scope
  handle->oidc->scope = get_url_parameter_copy (handle, OIDC_SCOPE_KEY);
  if (NULL == handle->oidc->scope)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_SCOPE);
    handle->edesc = GNUNET_strdup ("missing parameter scope");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
 
  // OPTIONAL value: nonce
  handle->oidc->nonce = get_url_parameter_copy (handle, OIDC_NONCE_KEY);
 
  // OPTIONAL value: claims
  handle->oidc->claims = get_url_parameter_copy (handle, OIDC_CLAIMS_KEY);
 
  // TODO check other values if needed
  number_of_ignored_parameter =
    sizeof(OIDC_ignored_parameter_array) / sizeof(char *);
  for (iterator = 0; iterator < number_of_ignored_parameter; iterator++)
  {
    GNUNET_CRYPTO_hash (OIDC_ignored_parameter_array[iterator],
                        strlen (OIDC_ignored_parameter_array[iterator]),
                        &cache_key);
    if (GNUNET_YES ==
        GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                ->url_param_map,
                                                &cache_key))
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_ACCESS_DENIED);
      GNUNET_asprintf (&handle->edesc,
                       "Server will not handle parameter: %s",
                       OIDC_ignored_parameter_array[iterator]);
      GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
      return;
    }
  }
 
  // We only support authorization code flows.
  if (0 != strcmp (handle->oidc->response_type,
                   OIDC_EXPECTED_AUTHORIZATION_RESPONSE_TYPE))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_UNSUPPORTED_RESPONSE_TYPE);
    handle->edesc = GNUNET_strdup ("The authorization server does not support "
                                   "obtaining this authorization code.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    return;
  }
 
  // Checks if scope contains 'openid'
  expected_scope = GNUNET_strdup (handle->oidc->scope);
  test = strtok (expected_scope, delimiter);
  while (NULL != test)
  {
    if (0 == strcmp (OIDC_EXPECTED_AUTHORIZATION_SCOPE, expected_scope))
      break;
    test = strtok (NULL, delimiter);
  }
  if (NULL == test)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_SCOPE);
    handle->edesc =
      GNUNET_strdup ("The requested scope is invalid, unknown, or malformed.");
    GNUNET_SCHEDULER_add_now (&do_redirect_error, handle);
    GNUNET_free (expected_scope);
    return;
  }
 
  GNUNET_free (expected_scope);
  if ((NULL == handle->oidc->login_identity) &&
      (GNUNET_NO == handle->oidc->user_cancelled))
    GNUNET_SCHEDULER_add_now (&login_redirect, handle);
  else
    GNUNET_SCHEDULER_add_now (&client_redirect, handle);
}

References client_redirect(), do_error(), do_redirect_error(), get_url_parameter_copy(), GNUNET_asprintf(), GNUNET_CONTAINER_multihashmap_contains(), GNUNET_CRYPTO_hash(), GNUNET_free, GNUNET_NO, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_YES, handle, login_redirect(), OIDC_CLAIMS_KEY, OIDC_ERROR_KEY_ACCESS_DENIED, OIDC_ERROR_KEY_INVALID_REQUEST, OIDC_ERROR_KEY_INVALID_SCOPE, OIDC_ERROR_KEY_UNSUPPORTED_RESPONSE_TYPE, OIDC_EXPECTED_AUTHORIZATION_RESPONSE_TYPE, OIDC_EXPECTED_AUTHORIZATION_SCOPE, OIDC_ignored_parameter_array, OIDC_NONCE_KEY, OIDC_REDIRECT_URI_KEY, OIDC_RESPONSE_TYPE_KEY, and OIDC_SCOPE_KEY.

Referenced by authorize_endpoint().

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tld_iter()

static void tld_iter ( void *  cls, const char *  section, const char *  option, const char *  value  )

static

Iterate over tlds in config.

Definition at line 1779 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_CRYPTO_BlindablePublicKey pkey;
 
  if (GNUNET_OK !=
      GNUNET_CRYPTO_blindable_public_key_from_string (value, &pkey))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Skipping non key %s\n", value);
    return;
  }
  if (0 == GNUNET_memcmp (&pkey, &handle->oidc->client_pkey))
    handle->tld = GNUNET_strdup (option + 1);
}

References GNUNET_CRYPTO_blindable_public_key_from_string(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcmp, GNUNET_OK, GNUNET_strdup, handle, pkey, and value.

Referenced by authorize_endpoint().

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authorize_endpoint()

static void authorize_endpoint ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Responds to authorization GET and url-encoded POST request.

Parameters

con_handle	the connection handle
url	the url
cls	the RequestHandle

Definition at line 1803 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct EgoEntry *tmp_ego;
  const struct GNUNET_CRYPTO_BlindablePrivateKey *priv_key;
  struct GNUNET_CRYPTO_BlindablePublicKey pkey;
 
  cookie_identity_interpretation (handle);
 
  // RECOMMENDED value: state - REQUIRED for answers
  handle->oidc->state = get_url_parameter_copy (handle, OIDC_STATE_KEY);
 
  // REQUIRED value: client_id
  handle->oidc->client_id = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
  if (NULL == handle->oidc->client_id)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter client_id");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // OPTIONAL value: code_challenge
  handle->oidc->code_challenge = get_url_parameter_copy (handle,
                                                         OIDC_CODE_CHALLENGE_KEY);
  if (NULL == handle->oidc->code_challenge)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "OAuth authorization request does not contain PKCE parameters!\n");
  }
 
  if (GNUNET_OK !=
      GNUNET_CRYPTO_blindable_public_key_from_string (handle->oidc->client_id,
                                                      &handle->oidc->client_pkey
                                                      ))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_UNAUTHORIZED_CLIENT);
    handle->edesc = GNUNET_strdup ("The client is not authorized to request an "
                                   "authorization code using this method.");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // If we know this identity, translated the corresponding TLD
  // TODO: We might want to have a reverse lookup functionality for TLDs?
  for (tmp_ego = ego_head; NULL != tmp_ego; tmp_ego = tmp_ego->next)
  {
    priv_key = GNUNET_IDENTITY_ego_get_private_key (tmp_ego->ego);
    GNUNET_CRYPTO_blindable_key_get_public (priv_key, &pkey);
    if (0 == GNUNET_memcmp (&pkey, &handle->oidc->client_pkey))
    {
      handle->tld = GNUNET_strdup (tmp_ego->identifier);
      handle->ego_entry = ego_tail;
    }
  }
  if (NULL == handle->tld)
    GNUNET_CONFIGURATION_iterate_section_values (oid_cfg, "gns", tld_iter,
                                                 handle);
  if (NULL == handle->tld)
    handle->tld = GNUNET_strdup (handle->oidc->client_id);
  GNUNET_SCHEDULER_add_now (&build_authz_response, handle);
}

References build_authz_response(), cookie_identity_interpretation(), do_error(), EgoEntry::ego, ego_head, ego_tail, get_url_parameter_copy(), GNUNET_CONFIGURATION_iterate_section_values(), GNUNET_CRYPTO_blindable_key_get_public(), GNUNET_CRYPTO_blindable_public_key_from_string(), GNUNET_ERROR_TYPE_WARNING, GNUNET_IDENTITY_ego_get_private_key(), GNUNET_log, GNUNET_memcmp, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_strdup, handle, EgoEntry::identifier, EgoEntry::next, oid_cfg, OIDC_CLIENT_ID_KEY, OIDC_CODE_CHALLENGE_KEY, OIDC_ERROR_KEY_INVALID_REQUEST, OIDC_ERROR_KEY_UNAUTHORIZED_CLIENT, OIDC_STATE_KEY, pkey, and tld_iter().

Referenced by REST_openid_process_request().

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login_cont()

static void login_cont ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Combines an identity with a login time and responds OK to login request.

Parameters

con_handle	the connection handle
url	the url
cls	the RequestHandle

Definition at line 1879 of file openid_plugin.c.

{
  struct MHD_Response *resp = GNUNET_REST_create_response ("");
  struct RequestHandle *handle = cls;
  struct GNUNET_HashCode cache_key;
  struct GNUNET_TIME_Absolute *current_time;
  struct GNUNET_TIME_Absolute *last_time;
  char *cookie;
  char *header_val;
  json_t *root;
  json_error_t error;
  json_t *identity;
  char term_data[handle->rest_handle->data_size + 1];
 
  term_data[handle->rest_handle->data_size] = '\0';
  GNUNET_memcpy (term_data,
                 handle->rest_handle->data,
                 handle->rest_handle->data_size);
  root = json_loads (term_data, JSON_DECODE_ANY, &error);
  identity = json_object_get (root, "identity");
  if (! json_is_string (identity))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Error parsing json string from %s\n",
                term_data);
    handle->proc (handle->proc_cls, resp, MHD_HTTP_BAD_REQUEST);
    json_decref (root);
    cleanup_handle (handle);
    return;
  }
  GNUNET_asprintf (&cookie, "Identity=%s", json_string_value (identity));
  GNUNET_asprintf (&header_val,
                   "%s;Max-Age=%d",
                   cookie,
                   OIDC_COOKIE_EXPIRATION);
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Set-Cookie", header_val));
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          "Access-Control-Allow-Methods",
                                          "POST"));
  GNUNET_CRYPTO_hash (cookie, strlen (cookie), &cache_key);
 
  if (0 != strcmp (json_string_value (identity), "Denied"))
  {
    current_time = GNUNET_new (struct GNUNET_TIME_Absolute);
    *current_time = GNUNET_TIME_relative_to_absolute (
      GNUNET_TIME_relative_multiply (GNUNET_TIME_relative_get_second_ (),
                                     OIDC_COOKIE_EXPIRATION));
    last_time =
      GNUNET_CONTAINER_multihashmap_get (OIDC_cookie_jar_map, &cache_key);
    GNUNET_free (last_time);
    GNUNET_CONTAINER_multihashmap_put (OIDC_cookie_jar_map,
                                       &cache_key,
                                       current_time,
                                       GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
  }
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  GNUNET_free (cookie);
  GNUNET_free (header_val);
  json_decref (root);
  cleanup_handle (handle);
}

References cleanup_handle(), GNUNET_asprintf(), GNUNET_assert, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE, GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_memcpy, GNUNET_new, GNUNET_REST_create_response(), GNUNET_TIME_relative_get_second_(), GNUNET_TIME_relative_multiply(), GNUNET_TIME_relative_to_absolute(), handle, identity, OIDC_COOKIE_EXPIRATION, and OIDC_cookie_jar_map.

Referenced by REST_openid_process_request().

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parse_credentials_basic_auth()

static int parse_credentials_basic_auth ( struct RequestHandle *  handle, char **  client_id, char **  client_secret  )

static

Definition at line 1947 of file openid_plugin.c.

{
  struct GNUNET_HashCode cache_key;
  char *authorization;
  char *credentials;
  char *basic_authorization;
  char *client_id_tmp;
  char *pass;
 
  GNUNET_CRYPTO_hash (OIDC_AUTHORIZATION_HEADER_KEY,
                      strlen (OIDC_AUTHORIZATION_HEADER_KEY),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->header_param_map,
                                                           &cache_key))
    return GNUNET_SYSERR;
  authorization =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->header_param_map,
                                       &cache_key);
 
  // split header in "Basic" and [content]
  credentials = strtok (authorization, " ");
  if ((NULL == credentials) || (0 != strcmp ("Basic", credentials)))
    return GNUNET_SYSERR;
  credentials = strtok (NULL, " ");
  if (NULL == credentials)
    return GNUNET_SYSERR;
  GNUNET_STRINGS_base64_decode (credentials,
                                strlen (credentials),
                                (void **) &basic_authorization);
 
  if (NULL == basic_authorization)
    return GNUNET_SYSERR;
  client_id_tmp = strtok (basic_authorization, ":");
  if (NULL == client_id_tmp)
  {
    GNUNET_free (basic_authorization);
    return GNUNET_SYSERR;
  }
  pass = strtok (NULL, ":");
  if (NULL == pass)
  {
    GNUNET_free (basic_authorization);
    return GNUNET_SYSERR;
  }
  *client_id = strdup (client_id_tmp);
  *client_secret = strdup (pass);
  GNUNET_free (basic_authorization);
  return GNUNET_OK;
}

References GNUNET_CONTAINER_multihashmap_contains(), GNUNET_CONTAINER_multihashmap_get(), GNUNET_CRYPTO_hash(), GNUNET_free, GNUNET_NO, GNUNET_OK, GNUNET_STRINGS_base64_decode(), GNUNET_SYSERR, handle, and OIDC_AUTHORIZATION_HEADER_KEY.

Referenced by check_authorization().

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parse_credentials_post_body()

static int parse_credentials_post_body ( struct RequestHandle *  handle, char **  client_id, char **  client_secret  )

static

Definition at line 2002 of file openid_plugin.c.

{
  struct GNUNET_HashCode cache_key;
  char *client_id_tmp;
  char *pass;
 
  GNUNET_CRYPTO_hash ("client_id",
                      strlen ("client_id"),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->url_param_map,
                                                           &cache_key))
    return GNUNET_SYSERR;
  client_id_tmp = GNUNET_CONTAINER_multihashmap_get (
    handle->rest_handle->url_param_map,
    &cache_key);
  if (NULL == client_id_tmp)
    return GNUNET_SYSERR;
  *client_id = strdup (client_id_tmp);
  GNUNET_CRYPTO_hash ("client_secret",
                      strlen ("client_secret"),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->url_param_map,
                                                           &cache_key))
  {
    GNUNET_free (*client_id);
    *client_id = NULL;
    return GNUNET_SYSERR;
  }
  pass = GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->url_param_map,
                                            &cache_key);
  if (NULL == pass)
  {
    GNUNET_free (*client_id);
    *client_id = NULL;
    return GNUNET_SYSERR;
  }
  *client_secret = strdup (pass);
  return GNUNET_OK;
}

References GNUNET_CONTAINER_multihashmap_contains(), GNUNET_CONTAINER_multihashmap_get(), GNUNET_CRYPTO_hash(), GNUNET_free, GNUNET_NO, GNUNET_OK, GNUNET_SYSERR, and handle.

Referenced by check_authorization().

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check_authorization()

static int check_authorization ( struct RequestHandle *  handle, struct GNUNET_CRYPTO_BlindablePublicKey *  cid  )

static

Allow public clients with PKCE

Definition at line 2048 of file openid_plugin.c.

{
  char *expected_pass;
  char *received_cid;
  char *received_cpw;
  char *pkce_cv;
 
  if (GNUNET_OK == parse_credentials_basic_auth (handle,
                                                 &received_cid,
                                                 &received_cpw))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Received client credentials in HTTP AuthZ header\n");
  }
  else if (GNUNET_OK == parse_credentials_post_body (handle,
                                                     &received_cid,
                                                     &received_cpw))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Received client credentials in POST body\n");
  }
  else
  {
    pkce_cv = get_url_parameter_copy (handle, OIDC_CODE_VERIFIER_KEY);
    if (NULL == pkce_cv)
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_CLIENT);
      handle->response_code = MHD_HTTP_UNAUTHORIZED;
      return GNUNET_SYSERR;
    }
    handle->public_client = GNUNET_YES;
    GNUNET_free (pkce_cv);
    received_cid = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
    GNUNET_STRINGS_string_to_data (received_cid,
                                   strlen (received_cid),
                                   cid,
                                   sizeof(struct
                                          GNUNET_CRYPTO_BlindablePublicKey));
    GNUNET_free (received_cid);
    return GNUNET_OK;
 
  }
 
  // check client password
  if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                          "reclaim-rest-plugin",
                                                          "OIDC_CLIENT_HMAC_SECRET",
                                                          &expected_pass))
  {
    if (0 != strcmp (expected_pass, received_cpw))
    {
      GNUNET_free (expected_pass);
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_CLIENT);
      handle->response_code = MHD_HTTP_UNAUTHORIZED;
      GNUNET_free (received_cpw);
      GNUNET_free (received_cid);
      return GNUNET_SYSERR;
    }
    GNUNET_free (expected_pass);
  }
  else
  {
    GNUNET_free (received_cpw);
    GNUNET_free (received_cid);
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    return GNUNET_SYSERR;
  }
  // check client_id
  for (handle->ego_entry = ego_head; NULL != handle->ego_entry;
       handle->ego_entry = handle->ego_entry->next)
  {
    if (0 == strcmp (handle->ego_entry->keystring, received_cid))
      break;
  }
  if (NULL == handle->ego_entry)
  {
    GNUNET_free (received_cpw);
    GNUNET_free (received_cid);
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_CLIENT);
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    return GNUNET_SYSERR;
  }
  GNUNET_STRINGS_string_to_data (received_cid,
                                 strlen (received_cid),
                                 cid,
                                 sizeof(struct GNUNET_CRYPTO_BlindablePublicKey)
                                 );
 
  GNUNET_free (received_cpw);
  GNUNET_free (received_cid);
  return GNUNET_OK;
}

References ego_head, get_url_parameter_copy(), GNUNET_CONFIGURATION_get_value_string(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_OK, GNUNET_strdup, GNUNET_STRINGS_string_to_data(), GNUNET_SYSERR, GNUNET_YES, handle, oid_cfg, OIDC_CLIENT_ID_KEY, OIDC_CODE_VERIFIER_KEY, OIDC_ERROR_KEY_INVALID_CLIENT, OIDC_ERROR_KEY_SERVER_ERROR, parse_credentials_basic_auth(), and parse_credentials_post_body().

Referenced by token_endpoint().

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find_ego()

static const struct EgoEntry * find_ego ( struct RequestHandle *  handle, struct GNUNET_CRYPTO_BlindablePublicKey *  test_key  )

static

Definition at line 2147 of file openid_plugin.c.

{
  struct EgoEntry *ego_entry;
  struct GNUNET_CRYPTO_BlindablePublicKey pub_key;
 
  for (ego_entry = ego_head; NULL != ego_entry;
       ego_entry = ego_entry->next)
  {
    GNUNET_IDENTITY_ego_get_public_key (ego_entry->ego, &pub_key);
    if (0 == GNUNET_memcmp (&pub_key, test_key))
      return ego_entry;
  }
  return NULL;
}

References EgoEntry::ego, ego_head, GNUNET_IDENTITY_ego_get_public_key(), GNUNET_memcmp, and EgoEntry::next.

Referenced by token_endpoint().

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token_endpoint()

static void token_endpoint ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Responds to token url-encoded POST request.

Parameters

con_handle	the connection handle
url	the url
cls	the RequestHandle

Store mapping from access token to code so we can later fall back on the provided attributes in userinfo one time.

Note to future self: This cache has the following purpose: Some OIDC plugins call the userendpoint right after receiving an ID token and access token. There are reasons why this would make sense. Others not so much. In any case, in order to smoothen out the user experience upon login (authorization), we speculatively cache the next userinfo response in case the actual resolution through reclaim/GNS takes too long.

Definition at line 2172 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  const struct EgoEntry *ego_entry = NULL;
  struct GNUNET_TIME_Relative expiration_time;
  struct GNUNET_RECLAIM_AttributeList *cl = NULL;
  struct GNUNET_RECLAIM_PresentationList *pl = NULL;
  struct GNUNET_RECLAIM_Ticket ticket;
  struct GNUNET_CRYPTO_BlindablePublicKey cid;
  struct GNUNET_HashCode cache_key;
  struct MHD_Response *resp = NULL;
  struct GNUNET_CRYPTO_BlindablePublicKey issuer;
  char *grant_type = NULL;
  char *code = NULL;
  char *json_response = NULL;
  char *id_token = NULL;
  char *access_token = NULL;
  char *jwa = NULL;
  char *jwt_secret = NULL;
  char *nonce = NULL;
  char *code_verifier = NULL;
  json_t *oidc_jwk_tmp = NULL;
  char *oidc_jwk_path = NULL;
  char *oidc_directory = NULL;
  char *tmp_at = NULL;
  char *received_cid = NULL;
  char *emsg = NULL;
 
  /*
   * Check Authorization
   */
  if (GNUNET_SYSERR == check_authorization (handle, &cid))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "OIDC authorization for token endpoint failed\n");
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  received_cid = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
 
  /*
   * Check parameter
   */
 
  // TODO Do not allow multiple equal parameter names
  // REQUIRED grant_type
  GNUNET_CRYPTO_hash (OIDC_GRANT_TYPE_KEY,
                      strlen (OIDC_GRANT_TYPE_KEY),
                      &cache_key);
  grant_type = get_url_parameter_copy (handle, OIDC_GRANT_TYPE_KEY);
  if (NULL == grant_type)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter grant_type");
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // Check parameter grant_type == "authorization_code"
  if (0 != strcmp (OIDC_GRANT_TYPE_VALUE, grant_type))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_UNSUPPORTED_GRANT_TYPE);
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (grant_type);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  GNUNET_free (grant_type);
  // REQUIRED code
  code = get_url_parameter_copy (handle, OIDC_CODE_KEY);
  if (NULL == code)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("missing parameter code");
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  ego_entry = find_ego (handle, &cid);
  if (NULL == ego_entry)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = GNUNET_strdup ("Unknown client");
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (code);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // REQUIRED code verifier
  code_verifier = get_url_parameter_copy (handle, OIDC_CODE_VERIFIER_KEY);
  if (NULL == code_verifier)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "OAuth authorization request does not contain PKCE parameters!\n");
 
  }
 
  // decode code
  if (GNUNET_OK != OIDC_parse_authz_code (received_cid, &cid, code,
                                          code_verifier,
                                          &ticket,
                                          &cl, &pl, &nonce,
                                          OIDC_VERIFICATION_DEFAULT,
                                          &emsg))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = emsg;
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (code);
    if (NULL != code_verifier)
      GNUNET_free (code_verifier);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
  if (NULL != code_verifier)
    GNUNET_free (code_verifier);
 
  // create jwt
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (oid_cfg,
                                                        "reclaim-rest-plugin",
                                                        "expiration_time",
                                                        &expiration_time))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_SERVER_ERROR);
    handle->edesc = GNUNET_strdup ("gnunet configuration failed");
    handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
    GNUNET_free (code);
    if (NULL != nonce)
      GNUNET_free (nonce);
    GNUNET_RECLAIM_attribute_list_destroy (cl);
    GNUNET_RECLAIM_presentation_list_destroy (pl);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  // Check if HMAC or RSA should be used
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                          "reclaim-rest-plugin",
                                                          "oidc_json_web_algorithm",
                                                          &jwa))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Could not read OIDC JSON Web Algorithm config attribute."
                "Defaulting to RS256.");
    jwa = GNUNET_strdup (JWT_ALG_VALUE_RSA);
  }
 
  GNUNET_GNS_parse_ztld (ticket.gns_name, &issuer);
 
  if (! strcmp (jwa, JWT_ALG_VALUE_RSA))
  {
    // Replace for now
    oidc_jwk_path = get_oidc_jwk_path (cls);
    oidc_jwk_tmp = read_jwk_from_file (oidc_jwk_path);
 
    // Check if secret JWK exists
    if (! oidc_jwk_tmp)
    {
      // Generate and save a new key
      oidc_jwk_tmp = generate_jwk ();
      oidc_directory = get_oidc_dir_path (cls);
 
      // Create new oidc directory
      if (GNUNET_OK != GNUNET_DISK_directory_create (oidc_directory))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    ("Failed to create directory `%s' for storing oidc data\n"),
                    oidc_directory);
      }
      else
      {
        write_jwk_to_file (oidc_jwk_path, oidc_jwk_tmp);
      }
    }
 
    // Generate oidc token
    id_token = OIDC_generate_id_token_rsa (received_cid,
                                           &issuer,
                                           cl,
                                           pl,
                                           &expiration_time,
                                           (NULL != nonce) ? nonce : NULL,
                                           oidc_jwk_tmp);
  }
  else if (! strcmp (jwa, JWT_ALG_VALUE_HMAC))
  {
    // TODO OPTIONAL acr,amr,azp
    if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (oid_cfg,
                                                            "reclaim-rest-plugin",
                                                            "jwt_secret",
                                                            &jwt_secret))
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
      handle->edesc = GNUNET_strdup ("No signing secret configured!");
      handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
      GNUNET_free (code);
      GNUNET_RECLAIM_attribute_list_destroy (cl);
      GNUNET_RECLAIM_presentation_list_destroy (pl);
      if (NULL != nonce)
        GNUNET_free (nonce);
      GNUNET_free (jwa);
      GNUNET_SCHEDULER_add_now (&do_error, handle);
      return;
    }
 
    id_token = OIDC_generate_id_token_hmac (received_cid,
                                            &issuer,
                                            cl,
                                            pl,
                                            &expiration_time,
                                            (NULL != nonce) ? nonce : NULL,
                                            jwt_secret);
 
    GNUNET_free (jwt_secret);
  }
  else
  {
    // TODO: OPTION NOT FOUND ERROR
  }
  GNUNET_free (jwa);
 
  if (NULL != nonce)
    GNUNET_free (nonce);
  access_token = OIDC_access_token_new (&ticket, handle->oidc->redirect_uri);
  GNUNET_CRYPTO_hash (access_token,
                      strlen (access_token),
                      &cache_key);
  tmp_at = GNUNET_CONTAINER_multihashmap_get (oidc_code_cache,
                                              &cache_key);
  GNUNET_CONTAINER_multihashmap_put (oidc_code_cache,
                                     &cache_key,
                                     code,
                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
  /* If there was a previous code in there, free the old value */
  if (NULL != tmp_at)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "OIDC access token already issued. Cleanup.\n");
    GNUNET_free (tmp_at);
  }
 
  OIDC_build_token_response (access_token,
                             id_token,
                             &expiration_time,
                             &json_response);
 
  resp = GNUNET_REST_create_response (json_response);
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Cache-Control",
                                                    "no-store"));
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Pragma", "no-cache"));
  GNUNET_assert (MHD_NO != MHD_add_response_header (resp,
                                                    "Content-Type",
                                                    "application/json"));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  GNUNET_RECLAIM_attribute_list_destroy (cl);
  GNUNET_RECLAIM_presentation_list_destroy (pl);
  GNUNET_free (access_token);
  GNUNET_free (json_response);
  GNUNET_free (id_token);
  cleanup_handle (handle);
}

References check_authorization(), cleanup_handle(), do_error(), find_ego(), generate_jwk(), get_oidc_dir_path(), get_oidc_jwk_path(), get_url_parameter_copy(), GNUNET_RECLAIM_Ticket::gns_name, GNUNET_assert, GNUNET_CONFIGURATION_get_value_string(), GNUNET_CONFIGURATION_get_value_time(), GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE, GNUNET_CRYPTO_hash(), GNUNET_DISK_directory_create(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNS_parse_ztld(), GNUNET_log, GNUNET_OK, GNUNET_RECLAIM_attribute_list_destroy(), GNUNET_RECLAIM_presentation_list_destroy(), GNUNET_REST_create_response(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_SYSERR, handle, JWT_ALG_VALUE_HMAC, JWT_ALG_VALUE_RSA, oid_cfg, OIDC_access_token_new(), OIDC_build_token_response(), OIDC_CLIENT_ID_KEY, oidc_code_cache, OIDC_CODE_KEY, OIDC_CODE_VERIFIER_KEY, OIDC_ERROR_KEY_INVALID_REQUEST, OIDC_ERROR_KEY_SERVER_ERROR, OIDC_ERROR_KEY_UNSUPPORTED_GRANT_TYPE, OIDC_generate_id_token_hmac(), OIDC_generate_id_token_rsa(), OIDC_GRANT_TYPE_KEY, OIDC_GRANT_TYPE_VALUE, OIDC_parse_authz_code(), OIDC_VERIFICATION_DEFAULT, read_jwk_from_file(), ticket, and write_jwk_to_file().

Referenced by REST_openid_process_request().

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consume_ticket()

static void consume_ticket ( void *  cls, const struct GNUNET_CRYPTO_BlindablePublicKey *  identity, const struct GNUNET_RECLAIM_Attribute *  attr, const struct GNUNET_RECLAIM_Presentation *  presentation  )

static

Collects claims and stores them in handle.

We received a reply. In any case clear the cache.

already in list

Credential matches for attribute, add

Definition at line 2459 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_AttributeListEntry *ale;
  struct GNUNET_RECLAIM_PresentationListEntry *atle;
  struct MHD_Response *resp;
  struct GNUNET_HashCode cache_key;
  char *result_str;
  char *cached_code;
 
  if (NULL != handle->consume_timeout_op)
    GNUNET_SCHEDULER_cancel (handle->consume_timeout_op);
  handle->consume_timeout_op = NULL;
  handle->idp_op = NULL;
 
  GNUNET_CRYPTO_hash (handle->access_token,
                      strlen (handle->access_token),
                      &cache_key);
  cached_code = GNUNET_CONTAINER_multihashmap_get (oidc_code_cache,
                                                   &cache_key);
  if (NULL != cached_code)
  {
    GNUNET_assert (GNUNET_YES ==
                   GNUNET_CONTAINER_multihashmap_remove (oidc_code_cache,
                                                         &cache_key,
                                                         cached_code));
    GNUNET_free (cached_code);
  }
 
 
  if (NULL == identity)
  {
    struct GNUNET_CRYPTO_BlindablePublicKey issuer;
    char *key;
    char *tmp = GNUNET_strdup (handle->ticket.gns_name);
    GNUNET_assert (NULL != strtok (tmp, "."));
    key = strtok (NULL, ".");
    GNUNET_assert (NULL != key);
    GNUNET_assert (GNUNET_OK ==
                   GNUNET_CRYPTO_blindable_public_key_from_string (key, &issuer)
                   );
    GNUNET_free (tmp);
    result_str = OIDC_generate_userinfo (&issuer,
                                         handle->attr_userinfo_list,
                                         handle->presentations);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Userinfo: %s\n", result_str);
    resp = GNUNET_REST_create_response (result_str);
    handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
    GNUNET_free (result_str);
    cleanup_handle (handle);
    return;
  }
  ale = GNUNET_new (struct GNUNET_RECLAIM_AttributeListEntry);
  ale->attribute = GNUNET_RECLAIM_attribute_new (attr->name,
                                                 &attr->credential,
                                                 attr->type,
                                                 attr->data,
                                                 attr->data_size);
  ale->attribute->id = attr->id;
  ale->attribute->flag = attr->flag;
  ale->attribute->credential = attr->credential;
  GNUNET_CONTAINER_DLL_insert (handle->attr_userinfo_list->list_head,
                               handle->attr_userinfo_list->list_tail,
                               ale);
  if (NULL == presentation)
    return;
  for (atle = handle->presentations->list_head;
       NULL != atle; atle = atle->next)
  {
    if (GNUNET_NO == GNUNET_RECLAIM_id_is_equal (
          &atle->presentation->credential_id,
          &presentation->credential_id))
      continue;
    break; 
  }
  if (NULL == atle)
  {
    atle = GNUNET_new (struct GNUNET_RECLAIM_PresentationListEntry);
    atle->presentation = GNUNET_RECLAIM_presentation_new (presentation->type,
                                                          presentation->data,
                                                          presentation->
                                                          data_size);
    atle->presentation->credential_id = presentation->credential_id;
    GNUNET_CONTAINER_DLL_insert (handle->presentations->list_head,
                                 handle->presentations->list_tail,
                                 atle);
  }
}

References GNUNET_RECLAIM_AttributeListEntry::attribute, cleanup_handle(), GNUNET_RECLAIM_Attribute::credential, GNUNET_RECLAIM_Presentation::credential_id, GNUNET_RECLAIM_Attribute::data, GNUNET_RECLAIM_Presentation::data, data_size, GNUNET_RECLAIM_Attribute::data_size, GNUNET_RECLAIM_Attribute::flag, GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_remove(), GNUNET_CRYPTO_blindable_public_key_from_string(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_RECLAIM_attribute_new(), GNUNET_RECLAIM_id_is_equal, GNUNET_RECLAIM_presentation_new(), GNUNET_REST_create_response(), GNUNET_SCHEDULER_cancel(), GNUNET_strdup, GNUNET_YES, handle, GNUNET_RECLAIM_Attribute::id, identity, key, GNUNET_RECLAIM_Attribute::name, GNUNET_RECLAIM_PresentationListEntry::next, oidc_code_cache, OIDC_generate_userinfo(), GNUNET_RECLAIM_PresentationListEntry::presentation, GNUNET_RECLAIM_Attribute::type, and GNUNET_RECLAIM_Presentation::type.

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consume_fail()

static void consume_fail ( void *  cls )

static

Remove the cached item

Definition at line 2557 of file openid_plugin.c.

{
  struct RequestHandle *handle = cls;
  struct GNUNET_HashCode cache_key;
  struct GNUNET_RECLAIM_AttributeList *cl = NULL;
  struct GNUNET_RECLAIM_PresentationList *pl = NULL;
  struct GNUNET_RECLAIM_Ticket ticket;
  struct GNUNET_CRYPTO_BlindablePublicKey cid;
  struct MHD_Response *resp;
  struct GNUNET_CRYPTO_BlindablePublicKey issuer;
  char *nonce;
  char *cached_code;
  char *result_str;
  char *received_cid;
  char *emsg;
  char *tmp;
  char *key;
 
  handle->consume_timeout_op = NULL;
  if (NULL != handle->idp_op)
    GNUNET_RECLAIM_cancel (handle->idp_op);
  handle->idp_op = NULL;
 
  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              "Ticket consumptioned timed out. Using cache...\n");
  GNUNET_CRYPTO_hash (handle->access_token,
                      strlen (handle->access_token),
                      &cache_key);
  cached_code = GNUNET_CONTAINER_multihashmap_get (oidc_code_cache,
                                                   &cache_key);
  if (NULL == cached_code)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("No Access Token in cache!");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    return;
  }
  GNUNET_assert (GNUNET_YES ==
                 GNUNET_CONTAINER_multihashmap_remove (oidc_code_cache,
                                                       &cache_key,
                                                       cached_code));
  received_cid = get_url_parameter_copy (handle, OIDC_CLIENT_ID_KEY);
  GNUNET_STRINGS_string_to_data (received_cid,
                                 strlen (received_cid),
                                 &cid,
                                 sizeof(struct GNUNET_CRYPTO_BlindablePublicKey)
                                 );
 
  // decode code
  if (GNUNET_OK != OIDC_parse_authz_code (received_cid, &cid,
                                          cached_code, NULL, &ticket,
                                          &cl, &pl, &nonce,
                                          OIDC_VERIFICATION_NO_CODE_VERIFIER, &
                                          emsg))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_REQUEST);
    handle->edesc = emsg;
    handle->response_code = MHD_HTTP_BAD_REQUEST;
    GNUNET_free (cached_code);
    if (NULL != nonce)
      GNUNET_free (nonce);
    GNUNET_SCHEDULER_add_now (&do_error, handle);
    return;
  }
 
  GNUNET_free (cached_code);
 
  tmp = GNUNET_strdup (handle->ticket.gns_name);
  GNUNET_assert (NULL != strtok (tmp, "."));
  key = strtok (NULL, ".");
  GNUNET_assert (NULL != key);
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CRYPTO_blindable_public_key_from_string (key, &issuer));
  GNUNET_free (tmp);
  result_str = OIDC_generate_userinfo (&issuer,
                                       cl,
                                       pl);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Userinfo: %s\n", result_str);
  resp = GNUNET_REST_create_response (result_str);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  GNUNET_free (result_str);
  GNUNET_free (nonce);
  GNUNET_RECLAIM_attribute_list_destroy (cl);
  GNUNET_RECLAIM_presentation_list_destroy (pl);
  cleanup_handle (handle);
}

References cleanup_handle(), do_error(), do_userinfo_error(), get_url_parameter_copy(), GNUNET_assert, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_remove(), GNUNET_CRYPTO_blindable_public_key_from_string(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_OK, GNUNET_RECLAIM_attribute_list_destroy(), GNUNET_RECLAIM_cancel(), GNUNET_RECLAIM_presentation_list_destroy(), GNUNET_REST_create_response(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, GNUNET_STRINGS_string_to_data(), GNUNET_YES, handle, key, OIDC_CLIENT_ID_KEY, oidc_code_cache, OIDC_ERROR_KEY_INVALID_REQUEST, OIDC_ERROR_KEY_INVALID_TOKEN, OIDC_generate_userinfo(), OIDC_parse_authz_code(), OIDC_VERIFICATION_NO_CODE_VERIFIER, and ticket.

Referenced by userinfo_endpoint().

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userinfo_endpoint()

static void userinfo_endpoint ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Responds to userinfo GET and url-encoded POST request.

Parameters

con_handle	the connection handle
url	the url
cls	the RequestHandle

Definition at line 2657 of file openid_plugin.c.

{
  // TODO expiration time
  struct RequestHandle *handle = cls;
  struct GNUNET_RECLAIM_Ticket *ticket;
  char delimiter[] = " ";
  struct GNUNET_HashCode cache_key;
  char *authorization;
  char *authorization_type;
  char *authorization_access_token;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Getting userinfo\n");
  GNUNET_CRYPTO_hash (OIDC_AUTHORIZATION_HEADER_KEY,
                      strlen (OIDC_AUTHORIZATION_HEADER_KEY),
                      &cache_key);
  if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (handle->rest_handle
                                                           ->header_param_map,
                                                           &cache_key))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("No Access Token");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    return;
  }
  authorization =
    GNUNET_CONTAINER_multihashmap_get (handle->rest_handle->header_param_map,
                                       &cache_key);
 
  // split header in "Bearer" and access_token
  authorization = GNUNET_strdup (authorization);
  authorization_type = strtok (authorization, delimiter);
  if ((NULL == authorization_type) ||
      (0 != strcmp ("Bearer", authorization_type)))
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("No Access Token");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    GNUNET_free (authorization);
    return;
  }
  authorization_access_token = strtok (NULL, delimiter);
  if (NULL == authorization_access_token)
  {
    handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
    handle->edesc = GNUNET_strdup ("Access token missing");
    handle->response_code = MHD_HTTP_UNAUTHORIZED;
    GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
    GNUNET_free (authorization);
    return;
  }
 
  {
    char *rp_uri;
    if (GNUNET_OK != OIDC_access_token_parse (authorization_access_token,
                                              &ticket, &rp_uri))
    {
      handle->emsg = GNUNET_strdup (OIDC_ERROR_KEY_INVALID_TOKEN);
      handle->edesc = GNUNET_strdup ("The access token is invalid");
      handle->response_code = MHD_HTTP_UNAUTHORIZED;
      GNUNET_SCHEDULER_add_now (&do_userinfo_error, handle);
      GNUNET_free (authorization);
      return;
 
    }
    GNUNET_assert (NULL != ticket);
    handle->ticket = *ticket;
    GNUNET_free (ticket);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Consuming ticket\n");
    handle->attr_userinfo_list =
      GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
    handle->presentations =
      GNUNET_new (struct GNUNET_RECLAIM_PresentationList);
 
    /* If the consume takes too long, we use values from the cache */
    handle->access_token = GNUNET_strdup (authorization_access_token);
    handle->consume_timeout_op = GNUNET_SCHEDULER_add_delayed (consume_timeout,
                                                               &consume_fail,
                                                               handle);
    handle->idp_op = GNUNET_RECLAIM_ticket_consume (idp,
                                                    &handle->ticket,
                                                    rp_uri,
                                                    &consume_ticket,
                                                    handle);
    GNUNET_free (authorization);
    GNUNET_free (rp_uri);
  }
}

References consume_fail(), consume_ticket, consume_timeout, do_userinfo_error(), GNUNET_assert, GNUNET_CONTAINER_multihashmap_contains(), GNUNET_CONTAINER_multihashmap_get(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_RECLAIM_ticket_consume(), GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_add_now(), GNUNET_strdup, handle, idp, OIDC_access_token_parse(), OIDC_AUTHORIZATION_HEADER_KEY, OIDC_ERROR_KEY_INVALID_TOKEN, and ticket.

Referenced by REST_openid_process_request().

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jwks_endpoint()

static void jwks_endpoint ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Responds to /jwks.json.

Parameters

con_handle	the connection handle
url	the url
cls	the RequestHandle

Definition at line 2758 of file openid_plugin.c.

{
  char *oidc_directory;
  char *oidc_jwk_path;
  char *oidc_jwk_pub_str;
  json_t *oidc_jwk_tmp;
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  oidc_jwk_path = get_oidc_jwk_path (cls);
  oidc_jwk_tmp = read_jwk_from_file (oidc_jwk_path);
 
  // Check if secret JWK exists
  if (! oidc_jwk_tmp)
  {
    // Generate and save a new key
    oidc_jwk_tmp = generate_jwk ();
    oidc_directory = get_oidc_dir_path (cls);
 
    // Create new oidc directory
    if (GNUNET_OK != GNUNET_DISK_directory_create (oidc_directory))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  ("Failed to create directory `%s' for storing oidc data\n"),
                  oidc_directory);
    }
    else
    {
      write_jwk_to_file (oidc_jwk_path, oidc_jwk_tmp);
    }
  }
 
  // Convert secret JWK to public JWK
  jose_jwk_pub (NULL, oidc_jwk_tmp);
 
  // Encode JWK as string and return to API endpoint
  oidc_jwk_pub_str = json_dumps (oidc_jwk_tmp, JSON_INDENT (1));
  resp = GNUNET_REST_create_response (oidc_jwk_pub_str);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  json_decref (oidc_jwk_tmp);
  GNUNET_free (oidc_jwk_pub_str);
  GNUNET_free (oidc_jwk_pub_str);
  cleanup_handle (handle);
}

References cleanup_handle(), generate_jwk(), get_oidc_dir_path(), get_oidc_jwk_path(), GNUNET_DISK_directory_create(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_OK, GNUNET_REST_create_response(), handle, read_jwk_from_file(), and write_jwk_to_file().

Referenced by REST_openid_process_request().

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list_ego()

static void list_ego ( void *  cls, struct GNUNET_IDENTITY_Ego *  ego, void **  ctx, const char *  identifier  )

static

If listing is enabled, prints information about the egos.

This function is initially called for all egos and then again whenever a ego's identifier changes or if it is deleted. At the end of the initial pass over all egos, the function is once called with 'NULL' for 'ego'. That does NOT mean that the callback won't be invoked in the future or that there was an error.

When used with 'GNUNET_IDENTITY_create', this function is only called ONCE, and 'NULL' being passed in 'ego' does indicate an error (for example because name is taken or no default value is known). If 'ego' is non-NULL and if '*ctx' is set in those callbacks, the value WILL be passed to a subsequent call to the identity callback of 'GNUNET_IDENTITY_connect' (if that one was not NULL).

When an identity is renamed, this function is called with the (known) ego but the NEW identifier.

When an identity is deleted, this function is called with the (known) ego and "NULL" for the 'identifier'. In this case, the 'ego' is henceforth invalid (and the 'ctx' should also be cleaned up).

Parameters

cls	closure
ego	ego handle
ctx	context for application to store data for this ego (during the lifetime of this process, initially NULL)
identifier	identifier assigned by the user for this ego, NULL if the user just deleted the ego and it must thus no longer be used

Definition at line 2839 of file openid_plugin.c.

{
  struct EgoEntry *ego_entry;
  struct GNUNET_CRYPTO_BlindablePublicKey pk;
 
  if (NULL == ego)
  {
    state = ID_REST_STATE_POST_INIT;
    return;
  }
  if (ID_REST_STATE_INIT == state)
 
  {
    ego_entry = GNUNET_new (struct EgoEntry);
    GNUNET_IDENTITY_ego_get_public_key (ego, &pk);
    ego_entry->keystring = GNUNET_CRYPTO_blindable_public_key_to_string (&pk);
    ego_entry->ego = ego;
    ego_entry->identifier = GNUNET_strdup (identifier);
    GNUNET_CONTAINER_DLL_insert_tail (ego_head,
                                      ego_tail,
                                      ego_entry);
    return;
  }
  /* Ego renamed or added */
  if (identifier != NULL)
  {
    for (ego_entry = ego_head; NULL != ego_entry;
         ego_entry = ego_entry->next)
    {
      if (ego_entry->ego == ego)
      {
        /* Rename */
        GNUNET_free (ego_entry->identifier);
        ego_entry->identifier = GNUNET_strdup (identifier);
        break;
      }
    }
    if (NULL == ego_entry)
    {
      /* Add */
      ego_entry = GNUNET_new (struct EgoEntry);
      GNUNET_IDENTITY_ego_get_public_key (ego, &pk);
      ego_entry->keystring = GNUNET_CRYPTO_blindable_public_key_to_string (&pk);
      ego_entry->ego = ego;
      ego_entry->identifier = GNUNET_strdup (identifier);
      GNUNET_CONTAINER_DLL_insert_tail (ego_head,
                                        ego_tail,
                                        ego_entry);
    }
  }
  else
  {
    /* Delete */
    for (ego_entry = ego_head; NULL != ego_entry;
         ego_entry = ego_entry->next)
    {
      if (ego_entry->ego == ego)
        break;
    }
    if (NULL == ego_entry)
      return; /* Not found */
 
    GNUNET_CONTAINER_DLL_remove (ego_head,
                                 ego_tail,
                                 ego_entry);
    GNUNET_free (ego_entry->identifier);
    GNUNET_free (ego_entry->keystring);
    GNUNET_free (ego_entry);
    return;
  }
}

References EgoEntry::ego, ego_head, ego_tail, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_CONTAINER_DLL_remove, GNUNET_CRYPTO_blindable_public_key_to_string(), GNUNET_free, GNUNET_IDENTITY_ego_get_public_key(), GNUNET_new, GNUNET_strdup, ID_REST_STATE_INIT, ID_REST_STATE_POST_INIT, EgoEntry::identifier, EgoEntry::keystring, EgoEntry::next, pk, and state.

Referenced by REST_openid_init().

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oidc_config_endpoint()

static void oidc_config_endpoint ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Definition at line 2916 of file openid_plugin.c.

{
  json_t *oidc_config;
  json_t *auth_methods;
  json_t *sig_algs;
  json_t *scopes;
  json_t *response_types;
  json_t *sub_types;
  json_t *claim_types;
  char *oidc_config_str;
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  oidc_config = json_object ();
  // FIXME get from config?
  json_object_set_new (oidc_config,
                       "issuer", json_string ("http://localhost:7776"));
  json_object_set_new (oidc_config,
                       "authorization_endpoint",
                       json_string ("https://api.reclaim/openid/authorize"));
  json_object_set_new (oidc_config,
                       "token_endpoint",
                       json_string ("http://localhost:7776/openid/token"));
  auth_methods = json_array ();
  json_array_append_new (auth_methods,
                         json_string ("client_secret_basic"));
  json_array_append_new (auth_methods,
                         json_string ("client_secret_post"));
  json_object_set_new (oidc_config,
                       "token_endpoint_auth_methods_supported",
                       auth_methods);
  sig_algs = json_array ();
  json_array_append_new (sig_algs,
                         json_string ("HS512"));
  json_array_append_new (sig_algs,
                         json_string ("RS256"));
  json_object_set_new (oidc_config,
                       "id_token_signing_alg_values_supported",
                       sig_algs);
  json_object_set_new (oidc_config,
                       "jwks_uri",
                       json_string ("http://localhost:7776/jwks.json"));
  json_object_set_new (oidc_config,
                       "userinfo_endpoint",
                       json_string ("http://localhost:7776/openid/userinfo"));
  scopes = json_array ();
  json_array_append_new (scopes,
                         json_string ("openid"));
  json_array_append_new (scopes,
                         json_string ("profile"));
  json_array_append_new (scopes,
                         json_string ("email"));
  json_array_append_new (scopes,
                         json_string ("address"));
  json_array_append_new (scopes,
                         json_string ("phone"));
  json_object_set_new (oidc_config,
                       "scopes_supported",
                       scopes);
  response_types = json_array ();
  json_array_append_new (response_types,
                         json_string ("code"));
  json_object_set_new (oidc_config,
                       "response_types_supported",
                       response_types);
  sub_types = json_array ();
  json_array_append_new (sub_types,
                         json_string ("public"));  /* no pairwise support */
  json_object_set_new (oidc_config,
                       "subject_types_supported",
                       sub_types);
  claim_types = json_array ();
  json_array_append_new (claim_types,
                         json_string ("normal"));
  json_array_append_new (claim_types,
                         json_string ("aggregated"));
  json_object_set_new (oidc_config,
                       "claim_types_supported",
                       claim_types);
  json_object_set_new (oidc_config,
                       "claims_parameter_supported",
                       json_boolean (1));
  oidc_config_str = json_dumps (oidc_config, JSON_INDENT (1));
  resp = GNUNET_REST_create_response (oidc_config_str);
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  json_decref (oidc_config);
  GNUNET_free (oidc_config_str);
  cleanup_handle (handle);
}

References cleanup_handle(), GNUNET_free, GNUNET_REST_create_response(), and handle.

Referenced by REST_openid_process_request().

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oidc_config_cors()

static void oidc_config_cors ( struct GNUNET_REST_RequestHandle *  con_handle, const char *  url, void *  cls  )

static

Respond to OPTIONS request.

Parameters

con_handle	the connection handle
url	the url
cls	the RequestHandle

Definition at line 3017 of file openid_plugin.c.

{
  struct MHD_Response *resp;
  struct RequestHandle *handle = cls;
 
  // For now, independent of path return all options
  resp = GNUNET_REST_create_response (NULL);
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          "Access-Control-Allow-Methods",
                                          allow_methods));
  GNUNET_assert (MHD_NO !=
                 MHD_add_response_header (resp,
                                          "Access-Control-Allow-Origin",
                                          "*"));
  handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
  cleanup_handle (handle);
  return;
}

References allow_methods, cleanup_handle(), GNUNET_assert, GNUNET_REST_create_response(), and handle.

Referenced by REST_openid_process_request().

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REST_openid_process_request()

enum GNUNET_GenericReturnValue REST_openid_process_request	(	void *	plugin,
		struct GNUNET_REST_RequestHandle *	conndata_handle,
		GNUNET_REST_ResultProcessor	proc,
		void *	proc_cls
	)

Function processing the REST call.

Parameters

method	HTTP method
url	URL of the HTTP request
data	body of the HTTP request (optional)
data_size	length of the body
proc	callback function for the result
proc_cls	closure for proc

Returns

GNUNET_OK if request accepted

Definition at line 3041 of file openid_plugin.c.

{
  struct RequestHandle *handle = GNUNET_new (struct RequestHandle);
  struct GNUNET_REST_RequestHandlerError err;
  static const struct GNUNET_REST_RequestHandler handlers[] =
  { { MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_AUTHORIZE, &authorize_endpoint },
    { MHD_HTTP_METHOD_POST,
      GNUNET_REST_API_NS_AUTHORIZE, &authorize_endpoint },   // url-encoded
    { MHD_HTTP_METHOD_POST, GNUNET_REST_API_NS_LOGIN, &login_cont },
    { MHD_HTTP_METHOD_POST, GNUNET_REST_API_NS_TOKEN, &token_endpoint },
    { MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_USERINFO, &userinfo_endpoint },
    { MHD_HTTP_METHOD_POST, GNUNET_REST_API_NS_USERINFO, &userinfo_endpoint },
    { MHD_HTTP_METHOD_GET, GNUNET_REST_API_JWKS, &jwks_endpoint },
    { MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_OIDC_CONFIG,
      &oidc_config_endpoint },
    { MHD_HTTP_METHOD_OPTIONS, GNUNET_REST_API_NS_OIDC_CONFIG,
      &oidc_config_cors },
    { MHD_HTTP_METHOD_OPTIONS, GNUNET_REST_API_NS_OIDC, &options_cont },
    GNUNET_REST_HANDLER_END };
 
  handle->oidc = GNUNET_new (struct OIDC_Variables);
  if (NULL == OIDC_cookie_jar_map)
    OIDC_cookie_jar_map = GNUNET_CONTAINER_multihashmap_create (10,
                                                                GNUNET_NO);
  if (NULL == oidc_code_cache)
    oidc_code_cache = GNUNET_CONTAINER_multihashmap_create (10,
                                                            GNUNET_NO);
 
  handle->response_code = 0;
  handle->timeout = GNUNET_TIME_UNIT_FOREVER_REL;
  handle->proc_cls = proc_cls;
  handle->proc = proc;
  handle->rest_handle = rest_handle;
  handle->url = GNUNET_strdup (rest_handle->url);
  handle->timeout_task =
    GNUNET_SCHEDULER_add_delayed (handle->timeout, &do_timeout, handle);
  GNUNET_CONTAINER_DLL_insert (requests_head,
                               requests_tail,
                               handle);
  if (handle->url[strlen (handle->url) - 1] == '/')
    handle->url[strlen (handle->url) - 1] = '\0';
  if (GNUNET_NO ==
      GNUNET_REST_handle_request (handle->rest_handle, handlers, &err, handle))
    return GNUNET_NO;
 
  return GNUNET_YES;
}

References authorize_endpoint(), do_timeout(), GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_multihashmap_create(), GNUNET_new, GNUNET_NO, GNUNET_REST_API_JWKS, GNUNET_REST_API_NS_AUTHORIZE, GNUNET_REST_API_NS_LOGIN, GNUNET_REST_API_NS_OIDC, GNUNET_REST_API_NS_OIDC_CONFIG, GNUNET_REST_API_NS_TOKEN, GNUNET_REST_API_NS_USERINFO, GNUNET_REST_handle_request(), GNUNET_REST_HANDLER_END, GNUNET_SCHEDULER_add_delayed(), GNUNET_strdup, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, handle, handlers, jwks_endpoint(), login_cont(), oidc_code_cache, oidc_config_cors(), oidc_config_endpoint(), OIDC_cookie_jar_map, options_cont(), GNUNET_REST_RequestHandler::proc, requests_head, requests_tail, token_endpoint(), GNUNET_REST_RequestHandle::url, and userinfo_endpoint().

Referenced by run().

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REST_openid_init()

void * REST_openid_init

(

const struct GNUNET_CONFIGURATION_Handle *

c

)

Entry point for the plugin.

Parameters

cls	Config info

Returns

NULL on error, otherwise the plugin context

Definition at line 3100 of file openid_plugin.c.

{
  static struct Plugin plugin;
  struct GNUNET_REST_Plugin *api;
 
  oid_cfg = c;
  if (NULL != plugin.cfg)
    return NULL;     /* can only initialize once! */
  memset (&plugin, 0, sizeof(struct Plugin));
  plugin.cfg = oid_cfg;
  api = GNUNET_new (struct GNUNET_REST_Plugin);
  api->cls = &plugin;
  api->name = GNUNET_REST_API_NS_OIDC;
  identity_handle = GNUNET_IDENTITY_connect (oid_cfg, &list_ego, NULL);
  gns_handle = GNUNET_GNS_connect (oid_cfg);
  idp = GNUNET_RECLAIM_connect (oid_cfg);
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (oid_cfg,
                                                        "reclaim-rest-plugin",
                                                        "OIDC_USERINFO_CONSUME_TIMEOUT",
                                                        &consume_timeout))
  {
    consume_timeout = CONSUME_TIMEOUT;
  }
 
 
  state = ID_REST_STATE_INIT;
  GNUNET_asprintf (&allow_methods,
                   "%s, %s, %s, %s, %s",
                   MHD_HTTP_METHOD_GET,
                   MHD_HTTP_METHOD_POST,
                   MHD_HTTP_METHOD_PUT,
                   MHD_HTTP_METHOD_DELETE,
                   MHD_HTTP_METHOD_OPTIONS);
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              _ ("OpenID Connect REST API initialized\n"));
  return api;
}

References _, allow_methods, GNUNET_REST_Plugin::cls, CONSUME_TIMEOUT, consume_timeout, gns_handle, GNUNET_asprintf(), GNUNET_CONFIGURATION_get_value_time(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_GNS_connect(), GNUNET_IDENTITY_connect(), GNUNET_log, GNUNET_new, GNUNET_OK, GNUNET_RECLAIM_connect(), GNUNET_REST_API_NS_OIDC, ID_REST_STATE_INIT, identity_handle, idp, list_ego(), GNUNET_REST_Plugin::name, oid_cfg, plugin, and state.

Referenced by run().

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cleanup_hashmap()

static int cleanup_hashmap ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Definition at line 3141 of file openid_plugin.c.

{
  GNUNET_free (value);
  return GNUNET_YES;
}

References GNUNET_free, GNUNET_YES, and value.

Referenced by REST_openid_done().

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REST_openid_done()

void REST_openid_done

(

struct GNUNET_REST_Plugin *

api

)

Exit point from the plugin.

Parameters

cls	the plugin context (as returned by "init")

Returns

always NULL

Definition at line 3149 of file openid_plugin.c.

{
  struct Plugin *plugin = api->cls;
  struct EgoEntry *ego_entry;
 
  plugin->cfg = NULL;
  while (NULL != requests_head)
    cleanup_handle (requests_head);
  if (NULL != OIDC_cookie_jar_map)
  {
    GNUNET_CONTAINER_multihashmap_iterate (OIDC_cookie_jar_map,
                                           &cleanup_hashmap,
                                           NULL);
    GNUNET_CONTAINER_multihashmap_destroy (OIDC_cookie_jar_map);
  }
  if (NULL != oidc_code_cache)
  {
    GNUNET_CONTAINER_multihashmap_iterate (oidc_code_cache,
                                           &cleanup_hashmap,
                                           NULL);
    GNUNET_CONTAINER_multihashmap_destroy (oidc_code_cache);
  }
 
  GNUNET_free (allow_methods);
  if (NULL != gns_handle)
    GNUNET_GNS_disconnect (gns_handle);
  if (NULL != identity_handle)
    GNUNET_IDENTITY_disconnect (identity_handle);
  if (NULL != idp)
    GNUNET_RECLAIM_disconnect (idp);
  while (NULL != (ego_entry = ego_head))
  {
    GNUNET_CONTAINER_DLL_remove (ego_head,
                                 ego_tail,
                                 ego_entry);
    GNUNET_free (ego_entry->identifier);
    GNUNET_free (ego_entry->keystring);
    GNUNET_free (ego_entry);
  }
  GNUNET_free (api);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "OpenID Connect REST plugin is finished\n");
}

References allow_methods, Plugin::api, cleanup_handle(), cleanup_hashmap(), GNUNET_BLOCK_PluginFunctions::cls, ego_head, ego_tail, gns_handle, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_GNS_disconnect(), GNUNET_IDENTITY_disconnect(), GNUNET_log, GNUNET_RECLAIM_disconnect(), EgoEntry::identifier, identity_handle, idp, EgoEntry::keystring, oidc_code_cache, OIDC_cookie_jar_map, plugin, and requests_head.

Referenced by do_shutdown().

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Variable Documentation

OIDC_ignored_parameter_array

const char* OIDC_ignored_parameter_array[]

static

Initial value:

= { "display",
                                                      "prompt",
                                                      "ui_locales",
                                                      "response_mode",
                                                      "id_token_hint",
                                                      "login_hint",
                                                      "acr_values" }

OIDC ignored parameter array.

Definition at line 249 of file openid_plugin.c.

                                                    { "display",
                                                      "prompt",
                                                      "ui_locales",
                                                      "response_mode",
                                                      "id_token_hint",
                                                      "login_hint",
                                                      "acr_values" };

Referenced by build_authz_response().

oidc_code_cache

struct GNUNET_CONTAINER_MultiHashMap* oidc_code_cache

OIDC hashmap for cached access tokens and codes.

Definition at line 260 of file openid_plugin.c.

Referenced by consume_fail(), consume_ticket(), REST_openid_done(), REST_openid_process_request(), and token_endpoint().

OIDC_cookie_jar_map

struct GNUNET_CONTAINER_MultiHashMap* OIDC_cookie_jar_map

OIDC hashmap that keeps track of issued cookies.

Definition at line 265 of file openid_plugin.c.

Referenced by code_redirect(), cookie_identity_interpretation(), login_cont(), REST_openid_done(), and REST_openid_process_request().

oid_cfg

const struct GNUNET_CONFIGURATION_Handle* oid_cfg

The configuration handle.

Definition at line 270 of file openid_plugin.c.

Referenced by authorize_endpoint(), check_authorization(), get_oidc_dir_path(), login_redirect(), REST_openid_init(), and token_endpoint().

allow_methods

char* allow_methods

static

HTTP methods allows for this plugin.

Definition at line 275 of file openid_plugin.c.

Referenced by oidc_config_cors(), options_cont(), REST_openid_done(), and REST_openid_init().

ego_head

struct EgoEntry* ego_head

static

Ego list.

Definition at line 280 of file openid_plugin.c.

Referenced by authorize_endpoint(), check_authorization(), code_redirect(), find_ego(), list_ego(), and REST_openid_done().

ego_tail

struct EgoEntry* ego_tail

static

Ego list.

Definition at line 285 of file openid_plugin.c.

Referenced by authorize_endpoint(), list_ego(), and REST_openid_done().

state

int state

static

The processing state.

Definition at line 290 of file openid_plugin.c.

Referenced by list_ego(), and REST_openid_init().

identity_handle

struct GNUNET_IDENTITY_Handle* identity_handle

static

Handle to Identity service.

Definition at line 295 of file openid_plugin.c.

Referenced by REST_openid_done(), and REST_openid_init().

gns_handle

struct GNUNET_GNS_Handle* gns_handle

static

GNS handle.

Definition at line 300 of file openid_plugin.c.

Referenced by client_redirect(), REST_openid_done(), and REST_openid_init().

idp

struct GNUNET_RECLAIM_Handle* idp

static

Identity Provider.

Definition at line 305 of file openid_plugin.c.

Referenced by cleanup_client(), client_connect_cb(), client_disconnect_cb(), code_redirect(), handle_attribute_delete_message(), handle_attribute_store_message(), handle_consume_ticket_message(), handle_credential_delete_message(), handle_credential_iteration_next(), handle_credential_iteration_start(), handle_credential_iteration_stop(), handle_credential_store_message(), handle_issue_ticket_message(), handle_iteration_next(), handle_iteration_start(), handle_iteration_stop(), handle_revoke_ticket_message(), oidc_attr_collect_finished_cb(), oidc_cred_collect_finished_cb(), REST_openid_done(), REST_openid_init(), and userinfo_endpoint().

consume_timeout

struct GNUNET_TIME_Relative consume_timeout

static

Timeout for consume call on userinfo.

Definition at line 310 of file openid_plugin.c.

Referenced by REST_openid_init(), and userinfo_endpoint().

oidc_jwk

json_t* oidc_jwk

The RSA key used by the oidc endpoint.

Definition at line 323 of file openid_plugin.c.

requests_head

struct RequestHandle* requests_head

static

DLL.

Definition at line 587 of file openid_plugin.c.

Referenced by cleanup_handle(), REST_openid_done(), and REST_openid_process_request().

requests_tail

struct RequestHandle* requests_tail

static

DLL.

Definition at line 592 of file openid_plugin.c.

Referenced by cleanup_handle(), and REST_openid_process_request().