GNUnet  0.11.x
plugin_reclaim_attestation_jwt.c
Go to the documentation of this file.
1 /*
2  This file is part of GNUnet
3  Copyright (C) 2013, 2014, 2016 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
29 #include "platform.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_reclaim_plugin.h"
32 #include <inttypes.h>
33 #include <jansson.h>
34 
44 static char *
46  uint32_t type,
47  const void *data,
48  size_t data_size)
49 {
50  switch (type)
51  {
53  return GNUNET_strndup (data, data_size);
54 
55  default:
56  return NULL;
57  }
58 }
59 
60 
72 static int
74  uint32_t type,
75  const char *s,
76  void **data,
77  size_t *data_size)
78 {
79  if (NULL == s)
80  return GNUNET_SYSERR;
81  switch (type)
82  {
84  *data = GNUNET_strdup (s);
85  *data_size = strlen (s);
86  return GNUNET_OK;
87 
88  default:
89  return GNUNET_SYSERR;
90  }
91 }
92 
93 
98 static struct
99 {
100  const char *name;
101  uint32_t number;
103  { NULL, UINT32_MAX } };
104 
112 static uint32_t
113 jwt_typename_to_number (void *cls, const char *jwt_typename)
114 {
115  unsigned int i;
116 
117  i = 0;
118  while ((NULL != jwt_attest_name_map[i].name) &&
119  (0 != strcasecmp (jwt_typename, jwt_attest_name_map[i].name)))
120  i++;
121  return jwt_attest_name_map[i].number;
122 }
123 
124 
132 static const char *
133 jwt_number_to_typename (void *cls, uint32_t type)
134 {
135  unsigned int i;
136 
137  i = 0;
138  while ((NULL != jwt_attest_name_map[i].name) && (type !=
140  number))
141  i++;
142  return jwt_attest_name_map[i].name;
143 }
144 
145 
155  const struct GNUNET_RECLAIM_Attestation *attest)
156 {
157  char *jwt_string;
158  struct GNUNET_RECLAIM_AttributeList *attrs;
159  char delim[] = ".";
160  char *val_str = NULL;
161  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Parsing JWT attributes.\n");
162  char *decoded_jwt;
163  json_t *json_val;
164  json_error_t *json_err = NULL;
165 
166  /* GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "%s\n", attest->data); (not OK: 'data' is not defined as 0-terminated text, but binary) */
168  return NULL;
169  attrs = GNUNET_new (struct GNUNET_RECLAIM_AttributeList);
170 
171  jwt_string = GNUNET_strdup (attest->data);
172  const char *jwt_body = strtok (jwt_string, delim);
173  jwt_body = strtok (NULL, delim);
174  GNUNET_STRINGS_base64url_decode (jwt_body, strlen (jwt_body),
175  (void **) &decoded_jwt);
176  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "%s\n", decoded_jwt);
177  GNUNET_assert (NULL != decoded_jwt);
178  json_val = json_loads (decoded_jwt, JSON_DECODE_ANY, json_err);
179  const char *key;
180  json_t *value;
181  json_object_foreach (json_val, key, value) {
182  if (0 == strcmp ("iss", key))
183  continue;
184  if (0 == strcmp ("exp", key))
185  continue;
186  if (0 == strcmp ("iat", key))
187  continue;
188  if (0 == strcmp ("nbf", key))
189  continue;
190  if (0 == strcmp ("aud", key))
191  continue;
192  val_str = json_dumps (value, JSON_ENCODE_ANY);
194  key,
195  NULL,
197  val_str,
198  strlen (val_str));
199  GNUNET_free (val_str);
200  }
201  GNUNET_free (jwt_string);
202  return attrs;
203 }
204 
205 
213 char *
214 jwt_get_issuer (void *cls,
215  const struct GNUNET_RECLAIM_Attestation *attest)
216 {
217  const char *jwt_body;
218  char *jwt_string;
219  char delim[] = ".";
220  char *issuer = NULL;
221  char *decoded_jwt;
222  json_t *issuer_json;
223  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Parsing JWT attributes.\n");
224  json_t *json_val;
225  json_error_t *json_err = NULL;
226 
228  return NULL;
229  jwt_string = GNUNET_strdup (attest->data);
230  jwt_body = strtok (jwt_string, delim);
231  jwt_body = strtok (NULL, delim);
232  GNUNET_STRINGS_base64url_decode (jwt_body, strlen (jwt_body),
233  (void **) &decoded_jwt);
234  json_val = json_loads (decoded_jwt, JSON_DECODE_ANY, json_err);
235  issuer_json = json_object_get (json_val, "iss");
236  if ((NULL == issuer_json) || (! json_is_string (issuer_json)))
237  return NULL;
238  issuer = GNUNET_strdup (json_string_value (issuer_json));
239  GNUNET_free (jwt_string);
240  return issuer;
241 }
242 
243 
251 int
253  const struct GNUNET_RECLAIM_Attestation *attest,
254  struct GNUNET_TIME_Absolute *exp)
255 {
256  const char *jwt_body;
257  char *jwt_string;
258  char delim[] = ".";
259  char *decoded_jwt;
260  json_t *exp_json;
261  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Parsing JWT attributes.\n");
262  json_t *json_val;
263  json_error_t *json_err = NULL;
264 
266  return GNUNET_NO;
267  jwt_string = GNUNET_strdup (attest->data);
268  jwt_body = strtok (jwt_string, delim);
269  jwt_body = strtok (NULL, delim);
270  GNUNET_STRINGS_base64url_decode (jwt_body, strlen (jwt_body),
271  (void **) &decoded_jwt);
272  json_val = json_loads (decoded_jwt, JSON_DECODE_ANY, json_err);
273  exp_json = json_object_get (json_val, "exp");
274  if ((NULL == exp_json) || (! json_is_integer (exp_json)))
275  return GNUNET_SYSERR;
276  exp->abs_value_us = json_integer_value (exp_json) * 1000 * 1000;
277  GNUNET_free (jwt_string);
278  return GNUNET_OK;
279 }
280 
281 
288 void *
290 {
292 
299  api->get_issuer = &jwt_get_issuer;
301  return api;
302 }
303 
304 
311 void *
313 {
315 
316  GNUNET_free (api);
317  return NULL;
318 }
319 
320 
321 /* end of plugin_reclaim_attestation_type_gnuid.c */
static char * jwt_value_to_string(void *cls, uint32_t type, const void *data, size_t data_size)
Convert the &#39;value&#39; of an attestation to a string.
void * cls
Closure for all of the callbacks.
static const char * jwt_number_to_typename(void *cls, uint32_t type)
Convert a type number (i.e.
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void * cls
Closure for all of the callbacks.
static uint32_t jwt_typename_to_number(void *cls, const char *jwt_typename)
Convert a type name to the corresponding number.
struct GNUNET_RECLAIM_AttributeList * jwt_parse_attributes(void *cls, const struct GNUNET_RECLAIM_Attestation *attest)
Parse a JWT and return the respective claim value as Attribute.
A list of GNUNET_RECLAIM_Attribute structures.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
GNUNET_RECLAIM_AttestationTypenameToNumberFunction typename_to_number
Typename to number.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
uint64_t abs_value_us
The actual value.
void GNUNET_RECLAIM_attribute_list_add(struct GNUNET_RECLAIM_AttributeList *attrs, const char *attr_name, const struct GNUNET_RECLAIM_Identifier *attestation, uint32_t type, const void *data, size_t data_size)
Add a new attribute to a claim list.
const char * name
static char * value
Value of the record to add/remove.
Each plugin is required to return a pointer to a struct of this type as the return value from its ent...
#define GNUNET_RECLAIM_ATTRIBUTE_TYPE_STRING
String attribute.
void * libgnunet_plugin_reclaim_attestation_jwt_init(void *cls)
Entry point for the plugin.
GNUNET_RECLAIM_AttestationGetIssuerFunction get_issuer
Attesation issuer.
GNUNET_RECLAIM_AttestationStringToValueFunction string_to_value
Conversion to binary.
static struct @65 jwt_attest_name_map[]
Mapping of attestation type numbers to human-readable attestation type names.
GNUNET_RECLAIM_AttestationGetAttributesFunction get_attributes
Attesation attributes.
static int jwt_string_to_value(void *cls, uint32_t type, const char *s, void **data, size_t *data_size)
Convert human-readable version of a &#39;value&#39; of an attestation to the binary representation.
uint32_t type
Type/Format of Claim.
#define GNUNET_RECLAIM_ATTESTATION_TYPE_JWT
A JSON Web Token attestation.
struct GNUNET_HashCode key
The key used in the DHT.
char * jwt_get_issuer(void *cls, const struct GNUNET_RECLAIM_Attestation *attest)
Parse a JWT and return the issuer.
const void * data
Binary value stored as attribute value.
#define GNUNET_strndup(a, length)
Wrapper around GNUNET_xstrndup_.
GNUNET_RECLAIM_AttestationNumberToTypenameFunction number_to_typename
Number to typename.
GNUNET_RECLAIM_AttestationGetExpirationFunction get_expiration
Expiration.
#define GNUNET_log(kind,...)
int jwt_get_expiration(void *cls, const struct GNUNET_RECLAIM_Attestation *attest, struct GNUNET_TIME_Absolute *exp)
Parse a JWT and return the expiration.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
Time for absolute times used by GNUnet, in microseconds.
GNUNET_RECLAIM_AttestationValueToStringFunction value_to_string
Conversion to string.
uint32_t data
The data value.
size_t GNUNET_STRINGS_base64url_decode(const char *data, size_t len, void **out)
Decode from Base64url.
Definition: strings.c:2048
void * libgnunet_plugin_reclaim_attestation_jwt_done(void *cls)
Exit point from the plugin.
#define GNUNET_free(ptr)
Wrapper around free.