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Diffstat (limited to 'src/abd/abd_serialization.c')
-rw-r--r-- | src/abd/abd_serialization.c | 508 |
1 files changed, 508 insertions, 0 deletions
diff --git a/src/abd/abd_serialization.c b/src/abd/abd_serialization.c new file mode 100644 index 000000000..d2bc15166 --- /dev/null +++ b/src/abd/abd_serialization.c | |||
@@ -0,0 +1,508 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2009-2013, 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 | |||
21 | |||
22 | /** | ||
23 | * @file abd/abd_serialization.c | ||
24 | * @brief API to serialize and deserialize delegation chains | ||
25 | * and abds | ||
26 | * @author Martin Schanzenbach | ||
27 | */ | ||
28 | #include "platform.h" | ||
29 | #include "gnunet_util_lib.h" | ||
30 | #include "gnunet_constants.h" | ||
31 | #include "gnunet_abd_service.h" | ||
32 | #include "gnunet_signatures.h" | ||
33 | #include "abd.h" | ||
34 | |||
35 | /** | ||
36 | * Calculate how many bytes we will need to serialize | ||
37 | * the given delegation chain | ||
38 | * | ||
39 | * @param ds_count number of delegation chain entries | ||
40 | * @param dsr array of #GNUNET_ABD_DelegationSet | ||
41 | * @return the required size to serialize | ||
42 | */ | ||
43 | size_t | ||
44 | GNUNET_ABD_delegation_set_get_size ( | ||
45 | unsigned int ds_count, | ||
46 | const struct GNUNET_ABD_DelegationSet *dsr) | ||
47 | { | ||
48 | unsigned int i; | ||
49 | size_t ret; | ||
50 | |||
51 | ret = sizeof (struct DelegationRecordData) * (ds_count); | ||
52 | |||
53 | for (i = 0; i < ds_count; i++) | ||
54 | { | ||
55 | GNUNET_assert ((ret + dsr[i].subject_attribute_len) >= ret); | ||
56 | ret += dsr[i].subject_attribute_len; | ||
57 | } | ||
58 | return ret; | ||
59 | } | ||
60 | |||
61 | /** | ||
62 | * Serizalize the given delegation chain entries and abd | ||
63 | * | ||
64 | * @param d_count number of delegation chain entries | ||
65 | * @param dsr array of #GNUNET_ABD_DelegationSet | ||
66 | * @param dest_size size of the destination | ||
67 | * @param dest where to store the result | ||
68 | * @return the size of the data, -1 on failure | ||
69 | */ | ||
70 | ssize_t | ||
71 | GNUNET_ABD_delegation_set_serialize ( | ||
72 | unsigned int d_count, | ||
73 | const struct GNUNET_ABD_DelegationSet *dsr, | ||
74 | size_t dest_size, | ||
75 | char *dest) | ||
76 | { | ||
77 | struct DelegationRecordData rec; | ||
78 | unsigned int i; | ||
79 | size_t off; | ||
80 | |||
81 | off = 0; | ||
82 | for (i = 0; i < d_count; i++) | ||
83 | { | ||
84 | rec.subject_attribute_len = htonl ((uint32_t) dsr[i].subject_attribute_len); | ||
85 | rec.subject_key = dsr[i].subject_key; | ||
86 | if (off + sizeof (rec) > dest_size) | ||
87 | return -1; | ||
88 | GNUNET_memcpy (&dest[off], &rec, sizeof (rec)); | ||
89 | off += sizeof (rec); | ||
90 | if (0 == dsr[i].subject_attribute_len) | ||
91 | continue; | ||
92 | if (off + dsr[i].subject_attribute_len > dest_size) | ||
93 | return -1; | ||
94 | GNUNET_memcpy (&dest[off], | ||
95 | dsr[i].subject_attribute, | ||
96 | dsr[i].subject_attribute_len); | ||
97 | off += dsr[i].subject_attribute_len; | ||
98 | } | ||
99 | return off; | ||
100 | } | ||
101 | |||
102 | |||
103 | /** | ||
104 | * Deserialize the given destination | ||
105 | * | ||
106 | * @param len size of the serialized delegation chain and cred | ||
107 | * @param src the serialized data | ||
108 | * @param d_count the number of delegation chain entries | ||
109 | * @param dsr where to put the delegation chain entries | ||
110 | * @return #GNUNET_OK on success, #GNUNET_SYSERR on error | ||
111 | */ | ||
112 | int | ||
113 | GNUNET_ABD_delegation_set_deserialize ( | ||
114 | size_t len, | ||
115 | const char *src, | ||
116 | unsigned int d_count, | ||
117 | struct GNUNET_ABD_DelegationSet *dsr) | ||
118 | { | ||
119 | struct DelegationRecordData rec; | ||
120 | unsigned int i; | ||
121 | size_t off; | ||
122 | |||
123 | off = 0; | ||
124 | for (i = 0; i < d_count; i++) | ||
125 | { | ||
126 | if (off + sizeof (rec) > len) | ||
127 | return GNUNET_SYSERR; | ||
128 | GNUNET_memcpy (&rec, &src[off], sizeof (rec)); | ||
129 | dsr[i].subject_key = rec.subject_key; | ||
130 | off += sizeof (rec); | ||
131 | dsr[i].subject_attribute_len = ntohl ((uint32_t) rec.subject_attribute_len); | ||
132 | if (off + dsr[i].subject_attribute_len > len) | ||
133 | return GNUNET_SYSERR; | ||
134 | dsr[i].subject_attribute = (char *) &src[off]; | ||
135 | off += dsr[i].subject_attribute_len; | ||
136 | } | ||
137 | return GNUNET_OK; | ||
138 | } | ||
139 | |||
140 | |||
141 | /** | ||
142 | * Calculate how many bytes we will need to serialize | ||
143 | * the abds | ||
144 | * | ||
145 | * @param c_count number of abd entries | ||
146 | * @param cd a #GNUNET_ABD_Credential | ||
147 | * @return the required size to serialize | ||
148 | */ | ||
149 | size_t | ||
150 | GNUNET_ABD_delegates_get_size ( | ||
151 | unsigned int c_count, | ||
152 | const struct GNUNET_ABD_Delegate *cd) | ||
153 | { | ||
154 | unsigned int i; | ||
155 | size_t ret; | ||
156 | |||
157 | ret = sizeof (struct DelegateEntry) * (c_count); | ||
158 | |||
159 | for (i = 0; i < c_count; i++) | ||
160 | { | ||
161 | GNUNET_assert ((ret + cd[i].issuer_attribute_len + cd[i].subject_attribute_len) >= ret); | ||
162 | // subject_attribute_len should be 0 | ||
163 | ret += cd[i].issuer_attribute_len + cd[i].subject_attribute_len; | ||
164 | } | ||
165 | return ret; | ||
166 | } | ||
167 | /** | ||
168 | * Serizalize the given abds | ||
169 | * | ||
170 | * @param c_count number of abd entries | ||
171 | * @param cd a #GNUNET_ABD_Credential | ||
172 | * @param dest_size size of the destination | ||
173 | * @param dest where to store the result | ||
174 | * @return the size of the data, -1 on failure | ||
175 | */ | ||
176 | ssize_t | ||
177 | GNUNET_ABD_delegates_serialize ( | ||
178 | unsigned int c_count, | ||
179 | const struct GNUNET_ABD_Delegate *cd, | ||
180 | size_t dest_size, | ||
181 | char *dest) | ||
182 | { | ||
183 | struct DelegateEntry c_rec; | ||
184 | unsigned int i; | ||
185 | size_t off; | ||
186 | |||
187 | off = 0; | ||
188 | for (i = 0; i < c_count; i++) | ||
189 | { | ||
190 | //c_rec.subject_attribute_len = htonl ((uint32_t) cd[i].subject_attribute_len); | ||
191 | c_rec.issuer_attribute_len = htonl ((uint32_t) cd[i].issuer_attribute_len); | ||
192 | c_rec.issuer_key = cd[i].issuer_key; | ||
193 | c_rec.subject_key = cd[i].subject_key; | ||
194 | c_rec.signature = cd[i].signature; | ||
195 | c_rec.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_DELEGATE); | ||
196 | c_rec.purpose.size = | ||
197 | htonl ((sizeof (struct DelegateEntry) + cd[i].issuer_attribute_len) - | ||
198 | sizeof (struct GNUNET_CRYPTO_EcdsaSignature)); | ||
199 | c_rec.expiration = GNUNET_htonll (cd[i].expiration.abs_value_us); | ||
200 | if (off + sizeof (c_rec) > dest_size) | ||
201 | return -1; | ||
202 | GNUNET_memcpy (&dest[off], &c_rec, sizeof (c_rec)); | ||
203 | off += sizeof (c_rec); | ||
204 | if (off + cd[i].issuer_attribute_len > dest_size) | ||
205 | return -1; | ||
206 | GNUNET_memcpy (&dest[off], | ||
207 | cd[i].issuer_attribute, | ||
208 | cd[i].issuer_attribute_len); | ||
209 | off += cd[i].issuer_attribute_len; | ||
210 | } | ||
211 | |||
212 | return off; | ||
213 | } | ||
214 | |||
215 | |||
216 | /** | ||
217 | * Deserialize the given destination | ||
218 | * | ||
219 | * @param len size of the serialized creds | ||
220 | * @param src the serialized data | ||
221 | * @param c_count the number of abd entries | ||
222 | * @param cd where to put the abd data | ||
223 | * @return #GNUNET_OK on success, #GNUNET_SYSERR on error | ||
224 | */ | ||
225 | int | ||
226 | GNUNET_ABD_delegates_deserialize (size_t len, | ||
227 | const char *src, | ||
228 | unsigned int c_count, | ||
229 | struct GNUNET_ABD_Delegate *cd) | ||
230 | { | ||
231 | struct DelegateEntry c_rec; | ||
232 | unsigned int i; | ||
233 | size_t off; | ||
234 | |||
235 | off = 0; | ||
236 | for (i = 0; i < c_count; i++) | ||
237 | { | ||
238 | if (off + sizeof (c_rec) > len) | ||
239 | return GNUNET_SYSERR; | ||
240 | GNUNET_memcpy (&c_rec, &src[off], sizeof (c_rec)); | ||
241 | cd[i].issuer_attribute_len = ntohl ((uint32_t) c_rec.issuer_attribute_len); | ||
242 | cd[i].issuer_key = c_rec.issuer_key; | ||
243 | cd[i].subject_key = c_rec.subject_key; | ||
244 | cd[i].signature = c_rec.signature; | ||
245 | cd[i].expiration.abs_value_us = GNUNET_ntohll (c_rec.expiration); | ||
246 | off += sizeof (c_rec); | ||
247 | if (off + cd[i].issuer_attribute_len > len) | ||
248 | return GNUNET_SYSERR; | ||
249 | cd[i].issuer_attribute = &src[off]; | ||
250 | off += cd[i].issuer_attribute_len; | ||
251 | cd[i].subject_attribute_len = 0; | ||
252 | } | ||
253 | return GNUNET_OK; | ||
254 | } | ||
255 | |||
256 | |||
257 | /** | ||
258 | * Calculate how many bytes we will need to serialize | ||
259 | * the given delegation chain and abd | ||
260 | * | ||
261 | * @param d_count number of delegation chain entries | ||
262 | * @param dd array of #GNUNET_ABD_Delegation | ||
263 | * @param c_count number of abd entries | ||
264 | * @param cd a #GNUNET_ABD_Credential | ||
265 | * @return the required size to serialize | ||
266 | */ | ||
267 | size_t | ||
268 | GNUNET_ABD_delegation_chain_get_size ( | ||
269 | unsigned int d_count, | ||
270 | const struct GNUNET_ABD_Delegation *dd, | ||
271 | unsigned int c_count, | ||
272 | const struct GNUNET_ABD_Delegate *cd) | ||
273 | { | ||
274 | unsigned int i; | ||
275 | size_t ret; | ||
276 | |||
277 | ret = sizeof (struct ChainEntry) * (d_count); | ||
278 | |||
279 | for (i = 0; i < d_count; i++) | ||
280 | { | ||
281 | GNUNET_assert ( | ||
282 | (ret + dd[i].issuer_attribute_len + dd[i].subject_attribute_len) >= ret); | ||
283 | ret += dd[i].issuer_attribute_len + dd[i].subject_attribute_len; | ||
284 | } | ||
285 | return ret + GNUNET_ABD_delegates_get_size (c_count, cd); | ||
286 | } | ||
287 | |||
288 | /** | ||
289 | * Serizalize the given delegation chain entries and abd | ||
290 | * | ||
291 | * @param d_count number of delegation chain entries | ||
292 | * @param dd array of #GNUNET_ABD_Delegation | ||
293 | * @param c_count number of abd entries | ||
294 | * @param cd a #GNUNET_ABD_Credential | ||
295 | * @param dest_size size of the destination | ||
296 | * @param dest where to store the result | ||
297 | * @return the size of the data, -1 on failure | ||
298 | */ | ||
299 | ssize_t | ||
300 | GNUNET_ABD_delegation_chain_serialize ( | ||
301 | unsigned int d_count, | ||
302 | const struct GNUNET_ABD_Delegation *dd, | ||
303 | unsigned int c_count, | ||
304 | const struct GNUNET_ABD_Delegate *cd, | ||
305 | size_t dest_size, | ||
306 | char *dest) | ||
307 | { | ||
308 | struct ChainEntry rec; | ||
309 | unsigned int i; | ||
310 | size_t off; | ||
311 | |||
312 | off = 0; | ||
313 | for (i = 0; i < d_count; i++) | ||
314 | { | ||
315 | rec.issuer_attribute_len = htonl ((uint32_t) dd[i].issuer_attribute_len); | ||
316 | rec.subject_attribute_len = htonl ((uint32_t) dd[i].subject_attribute_len); | ||
317 | rec.issuer_key = dd[i].issuer_key; | ||
318 | rec.subject_key = dd[i].subject_key; | ||
319 | if (off + sizeof (rec) > dest_size) | ||
320 | return -1; | ||
321 | GNUNET_memcpy (&dest[off], &rec, sizeof (rec)); | ||
322 | off += sizeof (rec); | ||
323 | if (off + dd[i].issuer_attribute_len > dest_size) | ||
324 | return -1; | ||
325 | GNUNET_memcpy (&dest[off], | ||
326 | dd[i].issuer_attribute, | ||
327 | dd[i].issuer_attribute_len); | ||
328 | off += dd[i].issuer_attribute_len; | ||
329 | if (0 == dd[i].subject_attribute_len) | ||
330 | continue; | ||
331 | if (off + dd[i].subject_attribute_len > dest_size) | ||
332 | return -1; | ||
333 | GNUNET_memcpy (&dest[off], | ||
334 | dd[i].subject_attribute, | ||
335 | dd[i].subject_attribute_len); | ||
336 | off += dd[i].subject_attribute_len; | ||
337 | } | ||
338 | return off + GNUNET_ABD_delegates_serialize (c_count, | ||
339 | cd, | ||
340 | dest_size - off, | ||
341 | &dest[off]); | ||
342 | } | ||
343 | |||
344 | |||
345 | /** | ||
346 | * Deserialize the given destination | ||
347 | * | ||
348 | * @param len size of the serialized delegation chain and cred | ||
349 | * @param src the serialized data | ||
350 | * @param d_count the number of delegation chain entries | ||
351 | * @param dd where to put the delegation chain entries | ||
352 | * @param c_count the number of abd entries | ||
353 | * @param cd where to put the abd data | ||
354 | * @return #GNUNET_OK on success, #GNUNET_SYSERR on error | ||
355 | */ | ||
356 | int | ||
357 | GNUNET_ABD_delegation_chain_deserialize ( | ||
358 | size_t len, | ||
359 | const char *src, | ||
360 | unsigned int d_count, | ||
361 | struct GNUNET_ABD_Delegation *dd, | ||
362 | unsigned int c_count, | ||
363 | struct GNUNET_ABD_Delegate *cd) | ||
364 | { | ||
365 | struct ChainEntry rec; | ||
366 | unsigned int i; | ||
367 | size_t off; | ||
368 | |||
369 | off = 0; | ||
370 | for (i = 0; i < d_count; i++) | ||
371 | { | ||
372 | if (off + sizeof (rec) > len) | ||
373 | return GNUNET_SYSERR; | ||
374 | GNUNET_memcpy (&rec, &src[off], sizeof (rec)); | ||
375 | dd[i].issuer_attribute_len = ntohl ((uint32_t) rec.issuer_attribute_len); | ||
376 | dd[i].issuer_key = rec.issuer_key; | ||
377 | dd[i].subject_key = rec.subject_key; | ||
378 | off += sizeof (rec); | ||
379 | if (off + dd[i].issuer_attribute_len > len) | ||
380 | return GNUNET_SYSERR; | ||
381 | dd[i].issuer_attribute = &src[off]; | ||
382 | off += dd[i].issuer_attribute_len; | ||
383 | dd[i].subject_attribute_len = ntohl ((uint32_t) rec.subject_attribute_len); | ||
384 | if (off + dd[i].subject_attribute_len > len) | ||
385 | return GNUNET_SYSERR; | ||
386 | dd[i].subject_attribute = &src[off]; | ||
387 | off += dd[i].subject_attribute_len; | ||
388 | } | ||
389 | return GNUNET_ABD_delegates_deserialize (len - off, | ||
390 | &src[off], | ||
391 | c_count, | ||
392 | cd); | ||
393 | } | ||
394 | |||
395 | int | ||
396 | GNUNET_ABD_delegate_serialize (struct GNUNET_ABD_Delegate *dele, | ||
397 | char **data) | ||
398 | { | ||
399 | size_t size; | ||
400 | struct DelegateEntry *cdata; | ||
401 | int attr_len; | ||
402 | |||
403 | // +1 for \0 | ||
404 | if (0 == dele->subject_attribute_len) | ||
405 | { | ||
406 | attr_len = dele->issuer_attribute_len + 1; | ||
407 | } | ||
408 | else | ||
409 | { | ||
410 | attr_len = dele->issuer_attribute_len + dele->subject_attribute_len + 2; | ||
411 | } | ||
412 | size = sizeof (struct DelegateEntry) + attr_len; | ||
413 | |||
414 | char tmp_str[attr_len]; | ||
415 | GNUNET_memcpy (tmp_str, dele->issuer_attribute, dele->issuer_attribute_len); | ||
416 | if (0 != dele->subject_attribute_len) | ||
417 | { | ||
418 | tmp_str[dele->issuer_attribute_len] = '\0'; | ||
419 | GNUNET_memcpy (tmp_str + dele->issuer_attribute_len + 1, | ||
420 | dele->subject_attribute, | ||
421 | dele->subject_attribute_len); | ||
422 | } | ||
423 | tmp_str[attr_len - 1] = '\0'; | ||
424 | |||
425 | *data = GNUNET_malloc (size); | ||
426 | cdata = (struct DelegateEntry *) *data; | ||
427 | cdata->subject_key = dele->subject_key; | ||
428 | cdata->issuer_key = dele->issuer_key; | ||
429 | cdata->expiration = GNUNET_htonll (dele->expiration.abs_value_us); | ||
430 | cdata->signature = dele->signature; | ||
431 | cdata->issuer_attribute_len = htonl (dele->issuer_attribute_len + 1); | ||
432 | if (0 == dele->subject_attribute_len) | ||
433 | { | ||
434 | cdata->subject_attribute_len = htonl (0); | ||
435 | } | ||
436 | else | ||
437 | { | ||
438 | cdata->subject_attribute_len = htonl (dele->subject_attribute_len + 1); | ||
439 | } | ||
440 | cdata->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_DELEGATE); | ||
441 | cdata->purpose.size = | ||
442 | htonl (size - sizeof (struct GNUNET_CRYPTO_EcdsaSignature)); | ||
443 | |||
444 | GNUNET_memcpy (&cdata[1], tmp_str, attr_len); | ||
445 | |||
446 | if (GNUNET_OK != | ||
447 | GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_DELEGATE, | ||
448 | &cdata->purpose, | ||
449 | &cdata->signature, | ||
450 | &cdata->issuer_key)) | ||
451 | { | ||
452 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Serialize: Invalid delegate\n"); | ||
453 | return 0; | ||
454 | } | ||
455 | return size; | ||
456 | } | ||
457 | |||
458 | struct GNUNET_ABD_Delegate * | ||
459 | GNUNET_ABD_delegate_deserialize (const char *data, size_t data_size) | ||
460 | { | ||
461 | struct GNUNET_ABD_Delegate *dele; | ||
462 | struct DelegateEntry *cdata; | ||
463 | char *attr_combo_str; | ||
464 | |||
465 | if (data_size < sizeof (struct DelegateEntry)) | ||
466 | return NULL; | ||
467 | cdata = (struct DelegateEntry *) data; | ||
468 | if (GNUNET_OK != | ||
469 | GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_DELEGATE, | ||
470 | &cdata->purpose, | ||
471 | &cdata->signature, | ||
472 | &cdata->issuer_key)) | ||
473 | { | ||
474 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Deserialize: Invalid delegate\n"); | ||
475 | return NULL; | ||
476 | } | ||
477 | attr_combo_str = (char *) &cdata[1]; | ||
478 | int iss_len = ntohl (cdata->issuer_attribute_len); | ||
479 | int sub_len = ntohl (cdata->subject_attribute_len); | ||
480 | int attr_combo_len = iss_len + sub_len; | ||
481 | |||
482 | dele = | ||
483 | GNUNET_malloc (sizeof (struct GNUNET_ABD_Delegate) + attr_combo_len); | ||
484 | |||
485 | dele->issuer_key = cdata->issuer_key; | ||
486 | dele->subject_key = cdata->subject_key; | ||
487 | GNUNET_memcpy (&dele[1], attr_combo_str, attr_combo_len); | ||
488 | dele->signature = cdata->signature; | ||
489 | |||
490 | // Set the pointers for the attributes | ||
491 | dele->issuer_attribute = (char *) &dele[1]; | ||
492 | dele->issuer_attribute_len = iss_len; | ||
493 | dele->subject_attribute_len = sub_len; | ||
494 | if (0 == sub_len) | ||
495 | { | ||
496 | dele->subject_attribute = NULL; | ||
497 | } | ||
498 | else | ||
499 | { | ||
500 | dele->subject_attribute = (char *) &dele[1] + iss_len; | ||
501 | } | ||
502 | |||
503 | dele->expiration.abs_value_us = GNUNET_ntohll (cdata->expiration); | ||
504 | |||
505 | return dele; | ||
506 | } | ||
507 | |||
508 | /* end of abd_serialization.c */ | ||