oidc_helper.c File Reference

#include <inttypes.h>
#include <jansson.h>
#include <jose/jose.h>
#include "gnunet_gns_service.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_util_lib.h"
#include "gnunet_reclaim_lib.h"
#include "gnunet_reclaim_service.h"
#include "gnunet_signatures.h"
#include "oidc_helper.h"
#include <gcrypt.h>

Include dependency graph for oidc_helper.c:

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Data Structures
struct	OIDC_Parameters
	The signature used to generate the authorization code. More...

Functions
static enum GNUNET_GenericReturnValue	is_claim_in_address_scope (const char *claim)
static char *	create_jwt_hmac_header (void)
static void	replace_char (char *str, char find, char replace)
static void	fix_base64 (char *str)
static json_t *	generate_userinfo_json (const struct GNUNET_CRYPTO_PublicKey *sub_key, const struct GNUNET_RECLAIM_AttributeList *attrs, const struct GNUNET_RECLAIM_PresentationList *presentations)
char *	OIDC_generate_userinfo (const struct GNUNET_CRYPTO_PublicKey *sub_key, const struct GNUNET_RECLAIM_AttributeList *attrs, const struct GNUNET_RECLAIM_PresentationList *presentations)
	Generate userinfo JSON as string. More...
char *	generate_id_token_body (const char *rp_uri, const struct GNUNET_CRYPTO_PublicKey *sub_key, const struct GNUNET_RECLAIM_AttributeList *attrs, const struct GNUNET_RECLAIM_PresentationList *presentations, const struct GNUNET_TIME_Relative *expiration_time, const char *nonce)
char *	OIDC_generate_id_token_rsa (const char *rp_uri, const struct GNUNET_CRYPTO_PublicKey *sub_key, const struct GNUNET_RECLAIM_AttributeList *attrs, const struct GNUNET_RECLAIM_PresentationList *presentations, const struct GNUNET_TIME_Relative *expiration_time, const char *nonce, const json_t *secret_rsa_key)
	Create a JWT using RSA256 algorithm from attributes. More...
char *	OIDC_generate_id_token_hmac (const char *rp_uri, const struct GNUNET_CRYPTO_PublicKey *sub_key, const struct GNUNET_RECLAIM_AttributeList *attrs, const struct GNUNET_RECLAIM_PresentationList *presentations, const struct GNUNET_TIME_Relative *expiration_time, const char *nonce, const char *secret_key)
	Create a JWT using HMAC (HS256) from attributes. More...
char *	OIDC_build_authz_code (const struct GNUNET_CRYPTO_PrivateKey *issuer, const struct GNUNET_RECLAIM_Ticket *ticket, const struct GNUNET_RECLAIM_AttributeList *attrs, const struct GNUNET_RECLAIM_PresentationList *presentations, const char *nonce_str, const char *code_challenge)
	Builds an OIDC authorization code including a reclaim ticket and nonce. More...
enum GNUNET_GenericReturnValue	check_code_challenge (const char *code_challenge, uint32_t code_challenge_len, const char *code_verifier)
int	OIDC_parse_authz_code (const char *rp_uri, const struct GNUNET_CRYPTO_PublicKey *cid, const char *code, const char *code_verifier, struct GNUNET_RECLAIM_Ticket *ticket, struct GNUNET_RECLAIM_AttributeList **attrs, struct GNUNET_RECLAIM_PresentationList **presentations, char **nonce_str, enum OIDC_VerificationOptions opts, char **emsg)
	Parse reclaim ticket and nonce from authorization code. More...
void	OIDC_build_token_response (const char *access_token, const char *id_token, const struct GNUNET_TIME_Relative *expiration_time, char **token_response)
	Build a token response for a token request TODO: Maybe we should add the scope here? More...
char *	OIDC_access_token_new (const struct GNUNET_RECLAIM_Ticket *ticket, const char *rp_uri)
	Generate a new access token. More...
int	OIDC_access_token_parse (const char *token, struct GNUNET_RECLAIM_Ticket **ticket, char **rp_uri)
	Parse an access token. More...
enum GNUNET_GenericReturnValue	OIDC_check_scopes_for_claim_request (const char *scopes, const char *attr)
	Checks if a claim is implicitly requested through standard scope(s) or explicitly through non-standard scope. More...

Variables
static GNUNET_NETWORK_STRUCT_END char	OIDC_profile_claims [14][32]
	Standard claims represented by the "profile" scope in OIDC. More...
static char	OIDC_email_claims [2][16]
	Standard claims represented by the "email" scope in OIDC. More...
static char	OIDC_phone_claims [2][32]
	Standard claims represented by the "phone" scope in OIDC. More...
static char	OIDC_address_claims [5][32]
	Standard claims represented by the "address" scope in OIDC. More...

Function Documentation

is_claim_in_address_scope()

static enum GNUNET_GenericReturnValue is_claim_in_address_scope ( const char *  claim )

static

Definition at line 106 of file oidc_helper.c.

{
  int i;
  for (i = 0; i < 5; i++)
  {
    if (0 == strcmp (claim, OIDC_address_claims[i]))
    {
      return GNUNET_YES;
    }
  }
  return GNUNET_NO;
}

References claim, GNUNET_NO, GNUNET_YES, and OIDC_address_claims.

Referenced by generate_userinfo_json().

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create_jwt_hmac_header()

static char * create_jwt_hmac_header ( void  )

static

Definition at line 121 of file oidc_helper.c.

{
  json_t *root;
  char *json_str;
 
  root = json_object ();
  json_object_set_new (root, JWT_ALG, json_string (JWT_ALG_VALUE_HMAC));
  json_object_set_new (root, JWT_TYP, json_string (JWT_TYP_VALUE));
 
  json_str = json_dumps (root, JSON_INDENT (0) | JSON_COMPACT);
  json_decref (root);
  return json_str;
}

References JWT_ALG, JWT_ALG_VALUE_HMAC, JWT_TYP, and JWT_TYP_VALUE.

Referenced by OIDC_generate_id_token_hmac().

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replace_char()

static void replace_char ( char *  str, char  find, char  replace  )

static

Definition at line 137 of file oidc_helper.c.

{
  char *current_pos = strchr (str, find);
 
  while (current_pos)
  {
    *current_pos = replace;
    current_pos = strchr (current_pos, find);
  }
}

References replace.

Referenced by fix_base64().

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fix_base64()

static void fix_base64 ( char *  str )

static

Definition at line 151 of file oidc_helper.c.

{
  // Replace + with -
  replace_char (str, '+', '-');
 
  // Replace / with _
  replace_char (str, '/', '_');
}

References replace_char().

Referenced by OIDC_generate_id_token_hmac().

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generate_userinfo_json()

static json_t * generate_userinfo_json ( const struct GNUNET_CRYPTO_PublicKey *  sub_key, const struct GNUNET_RECLAIM_AttributeList *  attrs, const struct GNUNET_RECLAIM_PresentationList *  presentations  )

static

There is this weird quirk that the individual address claim(s) must be inside a JSON object of the "address" claim.

There is this weird quirk that the individual address claim(s) must be inside a JSON object of the "address" claim.

This is/can only be set once!

Definition at line 162 of file oidc_helper.c.

{
  struct GNUNET_RECLAIM_AttributeListEntry *le;
  struct GNUNET_RECLAIM_PresentationListEntry *ple;
  char *subject;
  char *source_name;
  char *attr_val_str;
  char *pres_val_str;
  json_t *body;
  json_t *aggr_names;
  json_t *aggr_sources;
  json_t *aggr_sources_jwt;
  json_t *addr_claim = NULL;
  int num_presentations = 0;
  for (le = attrs->list_head; NULL != le; le = le->next)
  {
    if (GNUNET_NO == GNUNET_RECLAIM_id_is_zero (&le->attribute->credential))
      num_presentations++;
  }
 
  subject =
    GNUNET_STRINGS_data_to_string_alloc (sub_key,
                                         sizeof(struct
                                                GNUNET_CRYPTO_PublicKey));
  body = json_object ();
  aggr_names = json_object ();
  aggr_sources = json_object ();
 
  // iss REQUIRED case sensitive server uri with https
  // The issuer is the local reclaim instance (e.g.
  // https://reclaim.id/api/openid)
  json_object_set_new (body, "iss", json_string (SERVER_ADDRESS));
  // sub REQUIRED public key identity, not exceed 255 ASCII  length
  json_object_set_new (body, "sub", json_string (subject));
  GNUNET_free (subject);
  pres_val_str = NULL;
  source_name = NULL;
  int i = 0;
  for (ple = presentations->list_head; NULL != ple; ple = ple->next)
  {
    // New presentation
    GNUNET_asprintf (&source_name,
                     "src%d",
                     i);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Adding new presentation source #%d\n", i);
    aggr_sources_jwt = json_object ();
    pres_val_str =
      GNUNET_RECLAIM_presentation_value_to_string (ple->presentation->type,
                                                   ple->presentation->data,
                                                   ple->presentation->data_size)
    ;
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Presentation is: %s\n", pres_val_str);
    json_object_set_new (aggr_sources_jwt,
                         GNUNET_RECLAIM_presentation_number_to_typename (
                           ple->presentation->type),
                         json_string (pres_val_str) );
    json_object_set_new (aggr_sources, source_name, aggr_sources_jwt);
    GNUNET_free (pres_val_str);
    GNUNET_free (source_name);
    source_name = NULL;
    i++;
  }
 
  int addr_is_aggregated = GNUNET_NO;
  int addr_is_normal = GNUNET_NO;
  for (le = attrs->list_head; NULL != le; le = le->next)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Processing %s for userinfo body\n",
                le->attribute->name);
    if (GNUNET_YES == GNUNET_RECLAIM_id_is_zero (&le->attribute->credential))
    {
      attr_val_str =
        GNUNET_RECLAIM_attribute_value_to_string (le->attribute->type,
                                                  le->attribute->data,
                                                  le->attribute->data_size);
      if (GNUNET_YES == is_claim_in_address_scope (le->attribute->name))
      {
        if (GNUNET_YES == addr_is_aggregated)
        {
          GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                      "Address is set as aggregated claim. Skipping self-issued value...\n");
          GNUNET_free (attr_val_str);
          continue;
        }
        addr_is_normal = GNUNET_YES;
 
        if (NULL == addr_claim)
        {
          addr_claim = json_object ();
          json_object_set_new (body, "address", addr_claim);
        }
        json_object_set_new (addr_claim, le->attribute->name,
                             json_string (attr_val_str));
 
      }
      else
      {
        json_object_set_new (body, le->attribute->name,
                             json_string (attr_val_str));
      }
      GNUNET_free (attr_val_str);
    }
    else
    {
      // Check if presentation is there
      int j = 0;
      for (ple = presentations->list_head; NULL != ple; ple = ple->next)
      {
        if (GNUNET_YES ==
            GNUNET_RECLAIM_id_is_equal (&ple->presentation->credential_id,
                                        &le->attribute->credential))
          break;
        j++;
      }
      if (NULL == ple)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Presentation for `%s' missing...\n",
                    le->attribute->name);
        continue;
      }
      if (GNUNET_YES == is_claim_in_address_scope (le->attribute->name))
      {
        if (GNUNET_YES == addr_is_normal)
        {
          GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                      "Address is already set as normal claim. Skipping attested value...\n");
          continue;
        }
        addr_is_aggregated = GNUNET_YES;
        if (NULL != addr_claim)
          continue;
        addr_claim = json_object ();
        GNUNET_asprintf (&source_name,
                         "src%d",
                         j);
        json_object_set_new (aggr_names, "address",
                             json_string (source_name));
        GNUNET_free (source_name);
      }
      else
      {
        // Presentation exists, hence take the respective source str
        GNUNET_asprintf (&source_name,
                         "src%d",
                         j);
        json_object_set_new (aggr_names, le->attribute->name,
                             json_string (source_name));
        GNUNET_free (source_name);
      }
    }
  }
  if (0 != i)
  {
    json_object_set_new (body, "_claim_names", aggr_names);
    json_object_set_new (body, "_claim_sources", aggr_sources);
  }
 
  return body;
}

References GNUNET_RECLAIM_AttributeListEntry::attribute, GNUNET_RECLAIM_Attribute::credential, GNUNET_RECLAIM_Presentation::credential_id, GNUNET_RECLAIM_Attribute::data, GNUNET_RECLAIM_Presentation::data, GNUNET_RECLAIM_Attribute::data_size, GNUNET_RECLAIM_Presentation::data_size, GNUNET_asprintf(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_NO, GNUNET_RECLAIM_attribute_value_to_string(), GNUNET_RECLAIM_id_is_equal, GNUNET_RECLAIM_id_is_zero, GNUNET_RECLAIM_presentation_number_to_typename(), GNUNET_RECLAIM_presentation_value_to_string(), GNUNET_STRINGS_data_to_string_alloc(), GNUNET_YES, is_claim_in_address_scope(), GNUNET_RECLAIM_AttributeList::list_head, GNUNET_RECLAIM_PresentationList::list_head, GNUNET_RECLAIM_Attribute::name, GNUNET_RECLAIM_AttributeListEntry::next, GNUNET_RECLAIM_PresentationListEntry::next, GNUNET_RECLAIM_PresentationListEntry::presentation, SERVER_ADDRESS, subject, GNUNET_RECLAIM_Attribute::type, and GNUNET_RECLAIM_Presentation::type.

Referenced by generate_id_token_body(), and OIDC_generate_userinfo().

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OIDC_generate_userinfo()

char * OIDC_generate_userinfo	(	const struct GNUNET_CRYPTO_PublicKey *	sub_key,
		const struct GNUNET_RECLAIM_AttributeList *	attrs,
		const struct GNUNET_RECLAIM_PresentationList *	presentations
	)

Generate userinfo JSON as string.

Parameters

sub_key	the subject (user)
attrs	user attribute list
presentations	credential presentation list (may be empty)

Returns

Userinfo JSON

Definition at line 348 of file oidc_helper.c.

{
  char *body_str;
  json_t*body = generate_userinfo_json (sub_key,
                                        attrs,
                                        presentations);
  body_str = json_dumps (body, JSON_INDENT (0) | JSON_COMPACT);
  json_decref (body);
  return body_str;
}

References generate_userinfo_json().

Referenced by consume_fail(), and consume_ticket().

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generate_id_token_body()

char * generate_id_token_body	(	const char *	rp_uri,
		const struct GNUNET_CRYPTO_PublicKey *	sub_key,
		const struct GNUNET_RECLAIM_AttributeList *	attrs,
		const struct GNUNET_RECLAIM_PresentationList *	presentations,
		const struct GNUNET_TIME_Relative *	expiration_time,
		const char *	nonce
	)

Definition at line 364 of file oidc_helper.c.

{
  struct GNUNET_TIME_Absolute exp_time;
  struct GNUNET_TIME_Absolute time_now;
  json_t *body;
  char *subject;
  char *body_str;
 
  body = generate_userinfo_json (sub_key,
                                 attrs,
                                 presentations);
  // iat REQUIRED time now
  time_now = GNUNET_TIME_absolute_get ();
  // exp REQUIRED time expired from config
  exp_time = GNUNET_TIME_absolute_add (time_now, *expiration_time);
  // auth_time only if max_age
  // nonce only if nonce
  // OPTIONAL acr,amr,azp
  subject =
    GNUNET_STRINGS_data_to_string_alloc (sub_key,
                                         sizeof(struct
                                                GNUNET_CRYPTO_PublicKey));
 
  // aud REQUIRED public key client_id must be there
  json_object_set_new (body, "aud", json_string (rp_uri));
  // iat
  json_object_set_new (body,
                       "iat",
                       json_integer (time_now.abs_value_us / (1000 * 1000)));
  // exp
  json_object_set_new (body,
                       "exp",
                       json_integer (exp_time.abs_value_us / (1000 * 1000)));
  // nbf
  json_object_set_new (body,
                       "nbf",
                       json_integer (time_now.abs_value_us / (1000 * 1000)));
  // nonce
  if (NULL != nonce)
    json_object_set_new (body, "nonce", json_string (nonce));
 
  // Error checking
  body_str = json_dumps (body, JSON_INDENT (2) | JSON_COMPACT);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"ID-Token: %s\n", body_str);
 
  json_decref (body);
  GNUNET_free (subject);
 
  return body_str;
}

References GNUNET_TIME_Absolute::abs_value_us, generate_userinfo_json(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_STRINGS_data_to_string_alloc(), GNUNET_TIME_absolute_add(), GNUNET_TIME_absolute_get(), and subject.

Referenced by OIDC_generate_id_token_hmac(), and OIDC_generate_id_token_rsa().

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OIDC_generate_id_token_rsa()

char * OIDC_generate_id_token_rsa	(	const char *	rp_uri,
		const struct GNUNET_CRYPTO_PublicKey *	sub_key,
		const struct GNUNET_RECLAIM_AttributeList *	attrs,
		const struct GNUNET_RECLAIM_PresentationList *	presentations,
		const struct GNUNET_TIME_Relative *	expiration_time,
		const char *	nonce,
		const json_t *	secret_rsa_key
	)

Create a JWT using RSA256 algorithm from attributes.

Parameters

rp_uri	the RP URI
sub_key	the public key of the subject
attrs	the attribute list
presentations	credential presentation list (may be empty)
expiration_time	the validity of the token
secret_rsa_key	the key used to sign the JWT

Returns

a new base64-encoded JWT string.

Definition at line 423 of file oidc_helper.c.

{
  json_t *jws;
  char *body_str;
  char *result;
 
  // Generate the body of the JSON Web Signature
  body_str = generate_id_token_body (rp_uri,
                                     sub_key,
                                     attrs,
                                     presentations,
                                     expiration_time,
                                     nonce);
 
  if (NULL == body_str)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Body for the JWS could not be generated\n");
    return NULL;
  }
 
  // Creating the JSON Web Signature.
  jws = json_pack ("{s:o}", "payload",
                   jose_b64_enc (body_str, strlen (body_str)));
  GNUNET_free (body_str);
 
  if (! jose_jws_sig (NULL, jws, NULL, secret_rsa_key))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Signature generation failed\n");
    return NULL;
  }
 
  // Encoding JSON as compact JSON Web Signature
  GNUNET_asprintf (&result, "%s.%s.%s",
                   json_string_value (json_object_get (jws, "protected")),
                   json_string_value (json_object_get (jws, "payload")),
                   json_string_value (json_object_get (jws, "signature")) );
 
  json_decref (jws);
  return result;
}

References generate_id_token_body(), GNUNET_asprintf(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, and result.

Referenced by token_endpoint().

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OIDC_generate_id_token_hmac()

char * OIDC_generate_id_token_hmac	(	const char *	rp_uri,
		const struct GNUNET_CRYPTO_PublicKey *	sub_key,
		const struct GNUNET_RECLAIM_AttributeList *	attrs,
		const struct GNUNET_RECLAIM_PresentationList *	presentations,
		const struct GNUNET_TIME_Relative *	expiration_time,
		const char *	nonce,
		const char *	secret_key
	)

Create a JWT using HMAC (HS256) from attributes.

Parameters

rp_uri	the RP URI
sub_key	the public key of the subject
attrs	the attribute list
presentations	credential presentation list (may be empty)
expiration_time	the validity of the token
secret_key	the key used to sign the JWT

Returns

a new base64-encoded JWT string.

Creating the JWT signature. This might not be standards compliant, check.

Definition at line 475 of file oidc_helper.c.

{
  struct GNUNET_HashCode signature;
  char *header;
  char *header_base64;
  char *body_str;
  char *body_base64;
  char *signature_target;
  char *signature_base64;
  char *result;
 
  // Generate and encode Header
  header = create_jwt_hmac_header ();
  if (NULL == header)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Header for the JWS could not be generated\n");
    return NULL;
  }
  GNUNET_STRINGS_base64url_encode (header, strlen (header), &header_base64);
  GNUNET_free (header);
  fix_base64 (header_base64);
 
  // Generate and encode the body of the JSON Web Signature
  body_str = generate_id_token_body (rp_uri,
                                     sub_key,
                                     attrs,
                                     presentations,
                                     expiration_time,
                                     nonce);
 
  if (NULL == body_str)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Body for the JWS could not be generated\n");
    GNUNET_free (header_base64);
    return NULL;
  }
 
  GNUNET_STRINGS_base64url_encode (body_str, strlen (body_str), &body_base64);
  fix_base64 (body_base64);
 
  GNUNET_asprintf (&signature_target, "%s.%s", header_base64, body_base64);
  GNUNET_CRYPTO_hmac_raw (secret_key,
                          strlen (secret_key),
                          signature_target,
                          strlen (signature_target),
                          &signature);
  GNUNET_STRINGS_base64url_encode ((const char *) &signature,
                                   sizeof(struct GNUNET_HashCode),
                                   &signature_base64);
  fix_base64 (signature_base64);
 
  GNUNET_asprintf (&result,
                   "%s.%s.%s",
                   header_base64,
                   body_base64,
                   signature_base64);
 
  GNUNET_free (header_base64);
  GNUNET_free (body_str);
  GNUNET_free (body_base64);
  GNUNET_free (signature_target);
  GNUNET_free (signature_base64);
  return result;
}

References create_jwt_hmac_header(), fix_base64(), generate_id_token_body(), GNUNET_asprintf(), GNUNET_CRYPTO_hmac_raw(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_STRINGS_base64url_encode(), and result.

Referenced by token_endpoint().

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OIDC_build_authz_code()

char * OIDC_build_authz_code	(	const struct GNUNET_CRYPTO_PrivateKey *	issuer,
		const struct GNUNET_RECLAIM_Ticket *	ticket,
		const struct GNUNET_RECLAIM_AttributeList *	attrs,
		const struct GNUNET_RECLAIM_PresentationList *	presentations,
		const char *	nonce_str,
		const char *	code_challenge
	)

Builds an OIDC authorization code including a reclaim ticket and nonce.

Parameters

issuer	the issuer of the ticket, used to sign the ticket and nonce
ticket	the ticket to include in the code
attrs	list of attributes which are shared
presentations	credential presentation list (may be empty)
nonce	the nonce to include in the code
code_challenge	PKCE code challenge

Returns

a new authorization code (caller must free)

PLAINTEXT

END

Definition at line 567 of file oidc_helper.c.

{
  struct OIDC_Parameters params;
  char *code_payload;
  char *payload;
  char *tmp;
  char *code_str;
  char *buf_ptr = NULL;
  size_t payload_len;
  size_t code_payload_len;
  size_t attr_list_len = 0;
  size_t pres_list_len = 0;
  size_t code_challenge_len = 0;
  uint32_t nonce_len = 0;
  struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
 
  // Assign ticket
  memset (&params, 0, sizeof(params));
  memcpy (params.ticket.gns_name, ticket->gns_name, strlen (ticket->gns_name)
          + 1);
  // Assign nonce
  payload_len = sizeof(struct OIDC_Parameters);
  if ((NULL != nonce_str) && (strcmp ("", nonce_str) != 0))
  {
    nonce_len = strlen (nonce_str);
    payload_len += nonce_len;
  }
  params.nonce_len = htonl (nonce_len);
  // Assign code challenge
  if (NULL != code_challenge)
    code_challenge_len = strlen (code_challenge);
  payload_len += code_challenge_len;
  params.code_challenge_len = htonl (code_challenge_len);
  // Assign attributes
  if (NULL != attrs)
  {
    // Get length
    attr_list_len = GNUNET_RECLAIM_attribute_list_serialize_get_size (attrs);
    params.attr_list_len = htonl (attr_list_len);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Length of serialized attributes: %lu\n",
                attr_list_len);
    // Get serialized attributes
    payload_len += attr_list_len;
  }
  if (NULL != presentations)
  {
    // Get length
    // FIXME only add presentations relevant for attribute list!!!
    // This is important because of the distinction between id_token and
    // userinfo in OIDC
    pres_list_len =
      GNUNET_RECLAIM_presentation_list_serialize_get_size (presentations);
    params.pres_list_len = htonl (pres_list_len);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Length of serialized presentations: %lu\n",
                pres_list_len);
    // Get serialized attributes
    payload_len += pres_list_len;
  }
 
  // Get plaintext length
  payload = GNUNET_malloc (payload_len);
  memcpy (payload, &params, sizeof(params));
  tmp = payload + sizeof(params);
  if (0 < code_challenge_len)
  {
    memcpy (tmp, code_challenge, code_challenge_len);
    tmp += code_challenge_len;
  }
  if (0 < nonce_len)
  {
    memcpy (tmp, nonce_str, nonce_len);
    tmp += nonce_len;
  }
  if (0 < attr_list_len)
    GNUNET_RECLAIM_attribute_list_serialize (attrs, tmp);
  tmp += attr_list_len;
  if (0 < pres_list_len)
    GNUNET_RECLAIM_presentation_list_serialize (presentations, tmp);
  tmp += pres_list_len;
 
  // Get length
  code_payload_len = sizeof(struct GNUNET_CRYPTO_EccSignaturePurpose)
                     + payload_len + sizeof(struct
                                            GNUNET_CRYPTO_Signature);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Length of data to encode: %lu\n",
              code_payload_len);
 
  // Initialize code payload
  code_payload = GNUNET_malloc (code_payload_len);
  GNUNET_assert (NULL != code_payload);
  purpose = (struct GNUNET_CRYPTO_EccSignaturePurpose *) code_payload;
  purpose->size = htonl (sizeof(struct GNUNET_CRYPTO_EccSignaturePurpose)
                         + payload_len);
  purpose->purpose = htonl (GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN);
  // Store pubkey
  buf_ptr = (char *) &purpose[1];
  memcpy (buf_ptr, payload, payload_len);
  GNUNET_free (payload);
  buf_ptr += payload_len;
  // Sign and store signature
  if (GNUNET_SYSERR ==
      GNUNET_CRYPTO_sign_ (issuer,
                           purpose,
                           (struct GNUNET_CRYPTO_Signature *)
                           buf_ptr))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unable to sign code\n");
    GNUNET_free (code_payload);
    return NULL;
  }
  GNUNET_STRINGS_base64url_encode (code_payload, code_payload_len, &code_str);
  GNUNET_free (code_payload);
  return code_str;
}

References OIDC_Parameters::attr_list_len, OIDC_Parameters::code_challenge_len, GNUNET_RECLAIM_Ticket::gns_name, GNUNET_assert, GNUNET_break, GNUNET_CRYPTO_sign_(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_RECLAIM_attribute_list_serialize(), GNUNET_RECLAIM_attribute_list_serialize_get_size(), GNUNET_RECLAIM_presentation_list_serialize(), GNUNET_RECLAIM_presentation_list_serialize_get_size(), GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN, GNUNET_STRINGS_base64url_encode(), GNUNET_SYSERR, OIDC_Parameters::nonce_len, payload, OIDC_Parameters::pres_list_len, GNUNET_CRYPTO_EccSignaturePurpose::purpose, ticket, and OIDC_Parameters::ticket.

Referenced by oidc_ticket_issue_cb().

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check_code_challenge()

enum GNUNET_GenericReturnValue check_code_challenge	(	const char *	code_challenge,
		uint32_t	code_challenge_len,
		const char *	code_verifier
	)

Definition at line 697 of file oidc_helper.c.

{
  char *code_verifier_hash;
  char *expected_code_challenge;
 
  if (0 == code_challenge_len) /* Only check if this code requires a CV */
    return GNUNET_OK;
  if (NULL == code_verifier)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Expected code verifier!\n");
    return GNUNET_SYSERR;
  }
  code_verifier_hash = GNUNET_malloc (256 / 8);
  // hash code verifier
  gcry_md_hash_buffer (GCRY_MD_SHA256,
                       code_verifier_hash,
                       code_verifier,
                       strlen (code_verifier));
  // encode code verifier
  GNUNET_STRINGS_base64url_encode (code_verifier_hash, 256 / 8,
                                   &expected_code_challenge);
  GNUNET_free (code_verifier_hash);
  if (0 !=
      strncmp (expected_code_challenge, code_challenge, code_challenge_len))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Invalid code verifier! Expected: %s, Got: %.*s\n",
                expected_code_challenge,
                code_challenge_len,
                code_challenge);
    GNUNET_free (expected_code_challenge);
    return GNUNET_SYSERR;
  }
  GNUNET_free (expected_code_challenge);
  return GNUNET_OK;
}

References GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_OK, GNUNET_STRINGS_base64url_encode(), and GNUNET_SYSERR.

Referenced by OIDC_parse_authz_code().

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OIDC_parse_authz_code()

int OIDC_parse_authz_code	(	const char *	rp_uri,
		const struct GNUNET_CRYPTO_PublicKey *	cid,
		const char *	code,
		const char *	code_verifier,
		struct GNUNET_RECLAIM_Ticket *	ticket,
		struct GNUNET_RECLAIM_AttributeList **	attrs,
		struct GNUNET_RECLAIM_PresentationList **	presentations,
		char **	nonce_str,
		enum OIDC_VerificationOptions	opts,
		char **	emsg
	)

Parse reclaim ticket and nonce from authorization code.

This also verifies the signature in the code.

Parameters

audience	the expected audience of the code
code	the string representation of the code
code_verfier	PKCE code verifier. Optional, must be provided if used in request.
ticket	where to store the ticket
attrs	the attributes in the code
presentations	credential presentation list
nonce_str	where to store the nonce (if contained)

Returns

GNUNET_OK if successful, else GNUNET_SYSERR

Definition at line 754 of file oidc_helper.c.

{
  char *code_payload;
  char *ptr;
  char *plaintext;
  char *attrs_ser;
  char *presentations_ser;
  char *code_challenge;
  struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
  struct GNUNET_CRYPTO_Signature *signature;
  struct GNUNET_CRYPTO_PublicKey iss;
  uint32_t code_challenge_len;
  uint32_t attrs_ser_len;
  uint32_t pres_ser_len;
  size_t plaintext_len;
  size_t code_payload_len;
  uint32_t nonce_len = 0;
  struct OIDC_Parameters *params;
 
 
  GNUNET_GNS_parse_ztld (ticket->gns_name, &iss);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to decode `%s'\n", code);
  code_payload = NULL;
  code_payload_len =
    GNUNET_STRINGS_base64url_decode (code, strlen (code),
                                     (void **) &code_payload);
  if (code_payload_len < sizeof(struct GNUNET_CRYPTO_EccSignaturePurpose)
      + sizeof(struct OIDC_Parameters)
      + sizeof(struct GNUNET_CRYPTO_Signature))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Authorization code malformed\n");
    GNUNET_free (code_payload);
    return GNUNET_SYSERR;
  }
 
  purpose = (struct GNUNET_CRYPTO_EccSignaturePurpose *) code_payload;
  plaintext_len = code_payload_len;
  plaintext_len -= sizeof(struct GNUNET_CRYPTO_EccSignaturePurpose);
  ptr = (char *) &purpose[1];
  plaintext_len -= sizeof(struct GNUNET_CRYPTO_Signature);
  plaintext = ptr;
  ptr += plaintext_len;
  signature = (struct GNUNET_CRYPTO_Signature *) ptr;
  params = (struct OIDC_Parameters *) plaintext;
 
  // cmp code_challenge code_verifier
  code_challenge_len = ntohl (params->code_challenge_len);
  code_challenge = ((char *) &params[1]);
  if (! (opts & OIDC_VERIFICATION_NO_CODE_VERIFIER))
  {
    if (GNUNET_OK != check_code_challenge (code_challenge,
                                           code_challenge_len,
                                           code_verifier))
    {
      GNUNET_asprintf (emsg, "Code verifier `%s' invalid for challenge `%s'",
                       code_verifier, code_challenge);
      GNUNET_free (code_payload);
      return GNUNET_SYSERR;
    }
  }
  nonce_len = ntohl (params->nonce_len);
  if (0 != nonce_len)
  {
    *nonce_str = GNUNET_strndup (code_challenge + code_challenge_len,
                                 nonce_len);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got nonce: %s\n", *nonce_str);
  }
 
  // Ticket
  memcpy (ticket, &params->ticket, sizeof(params->ticket));
  // Signature
  // GNUNET_CRYPTO_ecdsa_key_get_public (ecdsa_priv, &ecdsa_pub);
  if (GNUNET_OK !=
      GNUNET_CRYPTO_signature_verify_ (
        GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN,
        purpose,
        signature,
        &iss))
  {
    GNUNET_free (code_payload);
    if (NULL != *nonce_str)
      GNUNET_free (*nonce_str);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Signature of AuthZ code invalid!\n");
    *emsg = GNUNET_strdup ("Signature verification failed");
    return GNUNET_SYSERR;
  }
  // Attributes
  attrs_ser = ((char *) &params[1]) + code_challenge_len + nonce_len;
  attrs_ser_len = ntohl (params->attr_list_len);
  *attrs = GNUNET_RECLAIM_attribute_list_deserialize (attrs_ser, attrs_ser_len);
  presentations_ser = ((char*) attrs_ser) + attrs_ser_len;
  pres_ser_len = ntohl (params->pres_list_len);
  *presentations =
    GNUNET_RECLAIM_presentation_list_deserialize (presentations_ser,
                                                  pres_ser_len);
 
  GNUNET_free (code_payload);
  return GNUNET_OK;
}

References OIDC_Parameters::attr_list_len, check_code_challenge(), OIDC_Parameters::code_challenge_len, GNUNET_RECLAIM_Ticket::gns_name, GNUNET_asprintf(), GNUNET_CRYPTO_signature_verify_(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_GNS_parse_ztld(), GNUNET_log, GNUNET_OK, GNUNET_RECLAIM_attribute_list_deserialize(), GNUNET_RECLAIM_presentation_list_deserialize(), GNUNET_SIGNATURE_PURPOSE_RECLAIM_CODE_SIGN, GNUNET_strdup, GNUNET_STRINGS_base64url_decode(), GNUNET_strndup, GNUNET_SYSERR, OIDC_Parameters::nonce_len, OIDC_VERIFICATION_NO_CODE_VERIFIER, gnunet-chk::opts, OIDC_Parameters::pres_list_len, GNUNET_CRYPTO_EccSignaturePurpose::purpose, ticket, and OIDC_Parameters::ticket.

Referenced by consume_fail(), and token_endpoint().

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OIDC_build_token_response()

void OIDC_build_token_response	(	const char *	access_token,
		const char *	id_token,
		const struct GNUNET_TIME_Relative *	expiration_time,
		char **	token_response
	)

Build a token response for a token request TODO: Maybe we should add the scope here?

Parameters

access_token	the access token to include
id_token	the id_token to include
expiration_time	the expiration time of the token(s)
token_response	where to store the response

Definition at line 873 of file oidc_helper.c.

{
  json_t *root_json;
 
  root_json = json_object ();
 
  GNUNET_assert (NULL != access_token);
  GNUNET_assert (NULL != id_token);
  GNUNET_assert (NULL != expiration_time);
  json_object_set_new (root_json, "access_token", json_string (access_token));
  json_object_set_new (root_json, "token_type", json_string ("Bearer"));
  json_object_set_new (root_json,
                       "expires_in",
                       json_integer (expiration_time->rel_value_us
                                     / (1000 * 1000)));
  json_object_set_new (root_json, "id_token", json_string (id_token));
  *token_response = json_dumps (root_json, JSON_INDENT (0) | JSON_COMPACT);
  json_decref (root_json);
}

References GNUNET_assert, and GNUNET_TIME_Relative::rel_value_us.

Referenced by token_endpoint().

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OIDC_access_token_new()

char * OIDC_access_token_new	(	const struct GNUNET_RECLAIM_Ticket *	ticket,
		const char *	rp_uri
	)

Generate a new access token.

Definition at line 901 of file oidc_helper.c.

{
  char *access_token;
  char *tkt_b64;
 
  GNUNET_STRINGS_base64_encode (ticket,
                                sizeof(*ticket),
                                &tkt_b64);
  GNUNET_asprintf (&access_token, "%s-%s", tkt_b64, rp_uri);
  GNUNET_free (tkt_b64);
  return access_token;
}

References GNUNET_asprintf(), GNUNET_free, GNUNET_STRINGS_base64_encode(), and ticket.

Referenced by token_endpoint().

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OIDC_access_token_parse()

int OIDC_access_token_parse	(	const char *	token,
		struct GNUNET_RECLAIM_Ticket **	ticket,
		char **	rp_uri
	)

Parse an access token.

Definition at line 920 of file oidc_helper.c.

{
  size_t sret;
  char *decoded;
  char *tmp;
  char *tkt_str;
  char *rp_uri_str;
  tmp = GNUNET_strdup (token);
  tkt_str = strtok (tmp, "-");
  GNUNET_assert (NULL != tkt_str); // FIXME handle
  rp_uri_str = strtok (NULL, "-");
  GNUNET_assert (NULL != rp_uri_str); // FIXME handle
  sret = GNUNET_STRINGS_base64_decode (tkt_str,
                                       strlen (tkt_str),
                                       (void**) &decoded);
  if (sizeof (struct GNUNET_RECLAIM_Ticket) != sret)
  {
    GNUNET_free (decoded);
    GNUNET_free (tmp);
    return GNUNET_SYSERR;
  }
  *ticket = (struct GNUNET_RECLAIM_Ticket *) decoded;
  *rp_uri = GNUNET_strdup (rp_uri_str);
  GNUNET_free (tmp);
  return GNUNET_OK;
}

References GNUNET_assert, GNUNET_free, GNUNET_OK, GNUNET_strdup, GNUNET_STRINGS_base64_decode(), GNUNET_SYSERR, and ticket.

Referenced by userinfo_endpoint().

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OIDC_check_scopes_for_claim_request()

enum GNUNET_GenericReturnValue OIDC_check_scopes_for_claim_request	(	const char *	scopes,
		const char *	attr
	)

Checks if a claim is implicitly requested through standard scope(s) or explicitly through non-standard scope.

Checks if a claim is implicitly requested through standard scope(s)

Parameters

scopes	the scopes which have been requested
attr	the attribute name to check

Returns

GNUNET_YES if attribute is implicitly requested

attribute matches requested scope

Definition at line 959 of file oidc_helper.c.

{
  char *scope_variables;
  char *scope_variable;
  char delimiter[] = " ";
  int i;
 
  scope_variables = GNUNET_strdup (scopes);
  scope_variable = strtok (scope_variables, delimiter);
  while (NULL != scope_variable)
  {
    if (0 == strcmp ("profile", scope_variable))
    {
      for (i = 0; i < 14; i++)
      {
        if (0 == strcmp (attr, OIDC_profile_claims[i]))
        {
          GNUNET_free (scope_variables);
          return GNUNET_YES;
        }
      }
    }
    else if (0 == strcmp ("address", scope_variable))
    {
      for (i = 0; i < 5; i++)
      {
        if (0 == strcmp (attr, OIDC_address_claims[i]))
        {
          GNUNET_free (scope_variables);
          return GNUNET_YES;
        }
      }
    }
    else if (0 == strcmp ("email", scope_variable))
    {
      for (i = 0; i < 2; i++)
      {
        if (0 == strcmp (attr, OIDC_email_claims[i]))
        {
          GNUNET_free (scope_variables);
          return GNUNET_YES;
        }
      }
    }
    else if (0 == strcmp ("phone", scope_variable))
    {
      for (i = 0; i < 2; i++)
      {
        if (0 == strcmp (attr, OIDC_phone_claims[i]))
        {
          GNUNET_free (scope_variables);
          return GNUNET_YES;
        }
      }
 
    }
    else if (0 == strcmp (attr, scope_variable))
    {
      GNUNET_free (scope_variables);
      return GNUNET_YES;
    }
    scope_variable = strtok (NULL, delimiter);
  }
  GNUNET_free (scope_variables);
  return GNUNET_NO;
 
}

References GNUNET_free, GNUNET_NO, GNUNET_strdup, GNUNET_YES, OIDC_address_claims, OIDC_email_claims, OIDC_phone_claims, and OIDC_profile_claims.

Referenced by attr_in_claims_request().

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Variable Documentation

OIDC_profile_claims

GNUNET_NETWORK_STRUCT_END char OIDC_profile_claims[14][32]

static

Initial value:

= {
  "name", "family_name", "given_name", "middle_name", "nickname",
  "preferred_username", "profile", "picture", "website", "gender", "birthdate",
  "zoneinfo", "locale", "updated_at"
}

Standard claims represented by the "profile" scope in OIDC.

Definition at line 78 of file oidc_helper.c.

Referenced by OIDC_check_scopes_for_claim_request().

OIDC_email_claims

char OIDC_email_claims[2][16]

static

Initial value:

= {
  "email", "email_verified"
}

Standard claims represented by the "email" scope in OIDC.

Definition at line 87 of file oidc_helper.c.

Referenced by OIDC_check_scopes_for_claim_request().

OIDC_phone_claims

char OIDC_phone_claims[2][32]

static

Initial value:

= {
  "phone_number", "phone_number_verified"
}

Standard claims represented by the "phone" scope in OIDC.

Definition at line 94 of file oidc_helper.c.

Referenced by OIDC_check_scopes_for_claim_request().

OIDC_address_claims

char OIDC_address_claims[5][32]

static

Initial value:

= {
  "street_address", "locality", "region", "postal_code", "country"
}

Standard claims represented by the "address" scope in OIDC.

Definition at line 101 of file oidc_helper.c.

Referenced by is_claim_in_address_scope(), and OIDC_check_scopes_for_claim_request().