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author | Martin Schanzenbach <mschanzenbach@posteo.de> | 2016-11-10 20:35:04 +0100 |
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committer | Martin Schanzenbach <mschanzenbach@posteo.de> | 2016-11-10 20:45:55 +0100 |
commit | 39981eee3163a1795026e8670ac5b669426f268b (patch) | |
tree | 8807df6deb2ed969ec951f77927b1b27d139d17f /src/credential/plugin_gnsrecord_credential.c | |
parent | 60585eacf2735c86b40effaed8614eff2643d6f9 (diff) | |
download | gnunet-39981eee3163a1795026e8670ac5b669426f268b.tar.gz gnunet-39981eee3163a1795026e8670ac5b669426f268b.zip |
add credential
Diffstat (limited to 'src/credential/plugin_gnsrecord_credential.c')
-rw-r--r-- | src/credential/plugin_gnsrecord_credential.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/src/credential/plugin_gnsrecord_credential.c b/src/credential/plugin_gnsrecord_credential.c new file mode 100644 index 000000000..6ae3b8980 --- /dev/null +++ b/src/credential/plugin_gnsrecord_credential.c | |||
@@ -0,0 +1,257 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2013 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as published | ||
7 | by the Free Software Foundation; either version 3, or (at your | ||
8 | 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 | General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License | ||
16 | along with GNUnet; see the file COPYING. If not, write to the | ||
17 | Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | ||
18 | Boston, MA 02110-1301, USA. | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file credential/plugin_gnsrecord_credential.c | ||
23 | * @brief gnsrecord plugin to provide the API for CREDENTIAL records | ||
24 | * @author Adnan Husain | ||
25 | */ | ||
26 | |||
27 | #include "platform.h" | ||
28 | #include "gnunet_util_lib.h" | ||
29 | #include "gnunet_gnsrecord_lib.h" | ||
30 | #include "gnunet_credential_service.h" | ||
31 | #include "gnunet_gnsrecord_plugin.h" | ||
32 | |||
33 | |||
34 | /** | ||
35 | * Convert the 'value' of a record to a string. | ||
36 | * | ||
37 | * @param cls closure, unused | ||
38 | * @param type type of the record | ||
39 | * @param data value in binary encoding | ||
40 | * @param data_size number of bytes in @a data | ||
41 | * @return NULL on error, otherwise human-readable representation of the value | ||
42 | */ | ||
43 | static char * | ||
44 | credential_value_to_string (void *cls, | ||
45 | uint32_t type, | ||
46 | const void *data, | ||
47 | size_t data_size) | ||
48 | { | ||
49 | |||
50 | const char *cdata; | ||
51 | |||
52 | switch (type) | ||
53 | { | ||
54 | case GNUNET_GNSRECORD_TYPE_CREDENTIAL: | ||
55 | { | ||
56 | struct GNUNET_CREDENTIAL_RecordData cred; | ||
57 | char *cred_str; | ||
58 | char *subject_pkey; | ||
59 | char *issuer_pkey; | ||
60 | uint32_t cf; // Credential flags | ||
61 | uint32_t mdd; // Max delegation depth | ||
62 | if (data_size < sizeof (struct GNUNET_CREDENTIAL_RecordData)) | ||
63 | return NULL; /* malformed */ | ||
64 | memcpy (&cred, | ||
65 | data, | ||
66 | sizeof (cred)); | ||
67 | cdata = data; | ||
68 | subject_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred.subject_key); | ||
69 | issuer_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred.issuer_key); | ||
70 | cf = ntohl (cred.credential_flags); | ||
71 | mdd = ntohl (cred.max_delegation_depth); | ||
72 | |||
73 | GNUNET_asprintf (&cred_str, | ||
74 | "%s %s %u %u %s", | ||
75 | subject_pkey, | ||
76 | issuer_pkey, | ||
77 | (unsigned int) cf, | ||
78 | (unsigned int) mdd, | ||
79 | &cdata[sizeof (cred)]); | ||
80 | GNUNET_free (subject_pkey); | ||
81 | GNUNET_free (issuer_pkey); | ||
82 | |||
83 | |||
84 | |||
85 | return cred_str; | ||
86 | } | ||
87 | default: | ||
88 | return NULL; | ||
89 | } | ||
90 | } | ||
91 | |||
92 | |||
93 | /** | ||
94 | * Convert human-readable version of a 'value' of a record to the binary | ||
95 | * representation. | ||
96 | * | ||
97 | * @param cls closure, unused | ||
98 | * @param type type of the record | ||
99 | * @param s human-readable string | ||
100 | * @param data set to value in binary encoding (will be allocated) | ||
101 | * @param data_size set to number of bytes in @a data | ||
102 | * @return #GNUNET_OK on success | ||
103 | */ | ||
104 | static int | ||
105 | credential_string_to_value (void *cls, | ||
106 | uint32_t type, | ||
107 | const char *s, | ||
108 | void **data, | ||
109 | size_t *data_size) | ||
110 | { | ||
111 | if (NULL == s) | ||
112 | return GNUNET_SYSERR; | ||
113 | switch (type) | ||
114 | { | ||
115 | case GNUNET_GNSRECORD_TYPE_CREDENTIAL: | ||
116 | { | ||
117 | struct GNUNET_CREDENTIAL_RecordData *cred; | ||
118 | unsigned int cf; // credential flags | ||
119 | unsigned int mdd; // max delegation depth | ||
120 | |||
121 | size_t enclen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8; | ||
122 | if (enclen % 5 > 0) | ||
123 | enclen += 5 - enclen % 5; | ||
124 | enclen /= 5; /* 260/5 = 52 */ | ||
125 | char subject_pkey[enclen + 1]; | ||
126 | char issuer_pkey[enclen + 1]; | ||
127 | char name[253 + 1]; | ||
128 | |||
129 | if (5 != SSCANF (s, | ||
130 | "%52s %52s %u %u %253s", | ||
131 | subject_pkey, | ||
132 | issuer_pkey, | ||
133 | &cf, | ||
134 | &mdd, | ||
135 | name)) | ||
136 | { | ||
137 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
138 | _("Unable to parse CRED record string `%s'\n"), | ||
139 | s); | ||
140 | return GNUNET_SYSERR; | ||
141 | } | ||
142 | *data_size = sizeof (struct GNUNET_CREDENTIAL_RecordData) + strlen (name) + 1; | ||
143 | *data = cred = GNUNET_malloc (*data_size); | ||
144 | GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_pkey, | ||
145 | strlen (subject_pkey), | ||
146 | &cred->subject_key); | ||
147 | GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_pkey, | ||
148 | strlen (issuer_pkey), | ||
149 | &cred->issuer_key); | ||
150 | cred->credential_flags = htonl (cf); | ||
151 | cred->max_delegation_depth = htonl (mdd); | ||
152 | GNUNET_memcpy (&cred[1], | ||
153 | name, | ||
154 | strlen (name)); | ||
155 | |||
156 | |||
157 | *data = GNUNET_strdup (s); | ||
158 | *data_size = strlen (s); | ||
159 | return GNUNET_OK; | ||
160 | } | ||
161 | default: | ||
162 | return GNUNET_SYSERR; | ||
163 | } | ||
164 | } | ||
165 | |||
166 | |||
167 | /** | ||
168 | * Mapping of record type numbers to human-readable | ||
169 | * record type names. | ||
170 | */ | ||
171 | static struct { | ||
172 | const char *name; | ||
173 | uint32_t number; | ||
174 | } name_map[] = { | ||
175 | { "CRED", GNUNET_GNSRECORD_TYPE_CREDENTIAL }, | ||
176 | { NULL, UINT32_MAX } | ||
177 | }; | ||
178 | |||
179 | |||
180 | /** | ||
181 | * Convert a type name (i.e. "AAAA") to the corresponding number. | ||
182 | * | ||
183 | * @param cls closure, unused | ||
184 | * @param gns_typename name to convert | ||
185 | * @return corresponding number, UINT32_MAX on error | ||
186 | */ | ||
187 | static uint32_t | ||
188 | credential_typename_to_number (void *cls, | ||
189 | const char *gns_typename) | ||
190 | { | ||
191 | unsigned int i; | ||
192 | |||
193 | i=0; | ||
194 | while ( (name_map[i].name != NULL) && | ||
195 | (0 != strcasecmp (gns_typename, name_map[i].name)) ) | ||
196 | i++; | ||
197 | return name_map[i].number; | ||
198 | } | ||
199 | |||
200 | |||
201 | /** | ||
202 | * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A") | ||
203 | * | ||
204 | * @param cls closure, unused | ||
205 | * @param type number of a type to convert | ||
206 | * @return corresponding typestring, NULL on error | ||
207 | */ | ||
208 | static const char * | ||
209 | credential_number_to_typename (void *cls, | ||
210 | uint32_t type) | ||
211 | { | ||
212 | unsigned int i; | ||
213 | |||
214 | i=0; | ||
215 | while ( (name_map[i].name != NULL) && | ||
216 | (type != name_map[i].number) ) | ||
217 | i++; | ||
218 | return name_map[i].name; | ||
219 | } | ||
220 | |||
221 | |||
222 | /** | ||
223 | * Entry point for the plugin. | ||
224 | * | ||
225 | * @param cls NULL | ||
226 | * @return the exported block API | ||
227 | */ | ||
228 | void * | ||
229 | libgnunet_plugin_gnsrecord_credential_init (void *cls) | ||
230 | { | ||
231 | struct GNUNET_GNSRECORD_PluginFunctions *api; | ||
232 | |||
233 | api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions); | ||
234 | api->value_to_string = &credential_value_to_string; | ||
235 | api->string_to_value = &credential_string_to_value; | ||
236 | api->typename_to_number = &credential_typename_to_number; | ||
237 | api->number_to_typename = &credential_number_to_typename; | ||
238 | return api; | ||
239 | } | ||
240 | |||
241 | |||
242 | /** | ||
243 | * Exit point from the plugin. | ||
244 | * | ||
245 | * @param cls the return value from #libgnunet_plugin_block_test_init | ||
246 | * @return NULL | ||
247 | */ | ||
248 | void * | ||
249 | libgnunet_plugin_gnsrecord_credential_done (void *cls) | ||
250 | { | ||
251 | struct GNUNET_GNSRECORD_PluginFunctions *api = cls; | ||
252 | |||
253 | GNUNET_free (api); | ||
254 | return NULL; | ||
255 | } | ||
256 | |||
257 | /* end of plugin_gnsrecord_credential.c */ | ||