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1 | /* | |
2 | * Copyright 2006-2022 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | #include "internal/e_os.h" | |
11 | ||
12 | #include <openssl/objects.h> | |
13 | #include <openssl/ts.h> | |
14 | #include <openssl/pkcs7.h> | |
15 | #include <openssl/crypto.h> | |
16 | #include "internal/cryptlib.h" | |
17 | #include "internal/sizes.h" | |
18 | #include "internal/time.h" | |
19 | #include "crypto/ess.h" | |
20 | #include "ts_local.h" | |
21 | ||
22 | DEFINE_STACK_OF_CONST(EVP_MD) | |
23 | ||
24 | static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *); | |
25 | static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec); | |
26 | static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *); | |
27 | ||
28 | static void ts_RESP_CTX_init(TS_RESP_CTX *ctx); | |
29 | static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx); | |
30 | static int ts_RESP_check_request(TS_RESP_CTX *ctx); | |
31 | static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx); | |
32 | static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx, | |
33 | ASN1_OBJECT *policy); | |
34 | static int ts_RESP_process_extensions(TS_RESP_CTX *ctx); | |
35 | static int ts_RESP_sign(TS_RESP_CTX *ctx); | |
36 | ||
37 | static int ts_TST_INFO_content_new(PKCS7 *p7); | |
38 | ||
39 | static ASN1_GENERALIZEDTIME | |
40 | *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long, | |
41 | unsigned); | |
42 | ||
43 | /* Default callback for response generation. */ | |
44 | static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data) | |
45 | { | |
46 | ASN1_INTEGER *serial = ASN1_INTEGER_new(); | |
47 | ||
48 | if (serial == NULL) | |
49 | goto err; | |
50 | if (!ASN1_INTEGER_set(serial, 1)) | |
51 | goto err; | |
52 | return serial; | |
53 | ||
54 | err: | |
55 | ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB); | |
56 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
57 | "Error during serial number generation."); | |
58 | ASN1_INTEGER_free(serial); | |
59 | return NULL; | |
60 | } | |
61 | ||
62 | static int def_time_cb(struct TS_resp_ctx *ctx, void *data, | |
63 | long *sec, long *usec) | |
64 | { | |
65 | OSSL_TIME t; | |
66 | struct timeval tv; | |
67 | ||
68 | t = ossl_time_now(); | |
69 | if (ossl_time_is_zero(t)) { | |
70 | ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR); | |
71 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
72 | "Time is not available."); | |
73 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); | |
74 | return 0; | |
75 | } | |
76 | tv = ossl_time_to_timeval(t); | |
77 | *sec = (long int)tv.tv_sec; | |
78 | *usec = (long int)tv.tv_usec; | |
79 | ||
80 | return 1; | |
81 | } | |
82 | ||
83 | static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, | |
84 | void *data) | |
85 | { | |
86 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
87 | "Unsupported extension."); | |
88 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /* TS_RESP_CTX management functions. */ | |
93 | ||
94 | TS_RESP_CTX *TS_RESP_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq) | |
95 | { | |
96 | TS_RESP_CTX *ctx; | |
97 | ||
98 | if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) | |
99 | return NULL; | |
100 | ||
101 | if (propq != NULL) { | |
102 | ctx->propq = OPENSSL_strdup(propq); | |
103 | if (ctx->propq == NULL) { | |
104 | OPENSSL_free(ctx); | |
105 | return NULL; | |
106 | } | |
107 | } | |
108 | ctx->libctx = libctx; | |
109 | ctx->serial_cb = def_serial_cb; | |
110 | ctx->time_cb = def_time_cb; | |
111 | ctx->extension_cb = def_extension_cb; | |
112 | ||
113 | return ctx; | |
114 | } | |
115 | ||
116 | TS_RESP_CTX *TS_RESP_CTX_new(void) | |
117 | { | |
118 | return TS_RESP_CTX_new_ex(NULL, NULL); | |
119 | } | |
120 | ||
121 | void TS_RESP_CTX_free(TS_RESP_CTX *ctx) | |
122 | { | |
123 | if (!ctx) | |
124 | return; | |
125 | ||
126 | OPENSSL_free(ctx->propq); | |
127 | X509_free(ctx->signer_cert); | |
128 | EVP_PKEY_free(ctx->signer_key); | |
129 | OSSL_STACK_OF_X509_free(ctx->certs); | |
130 | sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); | |
131 | ASN1_OBJECT_free(ctx->default_policy); | |
132 | sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ | |
133 | ASN1_INTEGER_free(ctx->seconds); | |
134 | ASN1_INTEGER_free(ctx->millis); | |
135 | ASN1_INTEGER_free(ctx->micros); | |
136 | OPENSSL_free(ctx); | |
137 | } | |
138 | ||
139 | int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) | |
140 | { | |
141 | if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { | |
142 | ERR_raise(ERR_LIB_TS, TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); | |
143 | return 0; | |
144 | } | |
145 | X509_free(ctx->signer_cert); | |
146 | ctx->signer_cert = signer; | |
147 | X509_up_ref(ctx->signer_cert); | |
148 | return 1; | |
149 | } | |
150 | ||
151 | int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) | |
152 | { | |
153 | EVP_PKEY_free(ctx->signer_key); | |
154 | ctx->signer_key = key; | |
155 | EVP_PKEY_up_ref(ctx->signer_key); | |
156 | ||
157 | return 1; | |
158 | } | |
159 | ||
160 | int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md) | |
161 | { | |
162 | ctx->signer_md = md; | |
163 | return 1; | |
164 | } | |
165 | ||
166 | int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy) | |
167 | { | |
168 | ASN1_OBJECT_free(ctx->default_policy); | |
169 | if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL) | |
170 | goto err; | |
171 | return 1; | |
172 | err: | |
173 | ERR_raise(ERR_LIB_TS, ERR_R_OBJ_LIB); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) | |
178 | { | |
179 | OSSL_STACK_OF_X509_free(ctx->certs); | |
180 | ctx->certs = NULL; | |
181 | ||
182 | return certs == NULL || (ctx->certs = X509_chain_up_ref(certs)) != NULL; | |
183 | } | |
184 | ||
185 | int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy) | |
186 | { | |
187 | ASN1_OBJECT *copy = NULL; | |
188 | ||
189 | if (ctx->policies == NULL | |
190 | && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL) { | |
191 | ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB); | |
192 | goto err; | |
193 | } | |
194 | if ((copy = OBJ_dup(policy)) == NULL) { | |
195 | ERR_raise(ERR_LIB_TS, ERR_R_OBJ_LIB); | |
196 | goto err; | |
197 | } | |
198 | if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) { | |
199 | ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB); | |
200 | goto err; | |
201 | } | |
202 | ||
203 | return 1; | |
204 | err: | |
205 | ASN1_OBJECT_free(copy); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) | |
210 | { | |
211 | if (ctx->mds == NULL | |
212 | && (ctx->mds = sk_EVP_MD_new_null()) == NULL) | |
213 | goto err; | |
214 | if (!sk_EVP_MD_push(ctx->mds, md)) | |
215 | goto err; | |
216 | ||
217 | return 1; | |
218 | err: | |
219 | ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | #define TS_RESP_CTX_accuracy_free(ctx) \ | |
224 | ASN1_INTEGER_free(ctx->seconds); \ | |
225 | ctx->seconds = NULL; \ | |
226 | ASN1_INTEGER_free(ctx->millis); \ | |
227 | ctx->millis = NULL; \ | |
228 | ASN1_INTEGER_free(ctx->micros); \ | |
229 | ctx->micros = NULL; | |
230 | ||
231 | int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, | |
232 | int secs, int millis, int micros) | |
233 | { | |
234 | ||
235 | TS_RESP_CTX_accuracy_free(ctx); | |
236 | if (secs | |
237 | && ((ctx->seconds = ASN1_INTEGER_new()) == NULL | |
238 | || !ASN1_INTEGER_set(ctx->seconds, secs))) | |
239 | goto err; | |
240 | if (millis | |
241 | && ((ctx->millis = ASN1_INTEGER_new()) == NULL | |
242 | || !ASN1_INTEGER_set(ctx->millis, millis))) | |
243 | goto err; | |
244 | if (micros | |
245 | && ((ctx->micros = ASN1_INTEGER_new()) == NULL | |
246 | || !ASN1_INTEGER_set(ctx->micros, micros))) | |
247 | goto err; | |
248 | ||
249 | return 1; | |
250 | err: | |
251 | TS_RESP_CTX_accuracy_free(ctx); | |
252 | ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) | |
257 | { | |
258 | ctx->flags |= flags; | |
259 | } | |
260 | ||
261 | void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) | |
262 | { | |
263 | ctx->serial_cb = cb; | |
264 | ctx->serial_cb_data = data; | |
265 | } | |
266 | ||
267 | void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data) | |
268 | { | |
269 | ctx->time_cb = cb; | |
270 | ctx->time_cb_data = data; | |
271 | } | |
272 | ||
273 | void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, | |
274 | TS_extension_cb cb, void *data) | |
275 | { | |
276 | ctx->extension_cb = cb; | |
277 | ctx->extension_cb_data = data; | |
278 | } | |
279 | ||
280 | int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, | |
281 | int status, const char *text) | |
282 | { | |
283 | TS_STATUS_INFO *si = NULL; | |
284 | ASN1_UTF8STRING *utf8_text = NULL; | |
285 | int ret = 0; | |
286 | ||
287 | if ((si = TS_STATUS_INFO_new()) == NULL) { | |
288 | ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB); | |
289 | goto err; | |
290 | } | |
291 | if (!ASN1_INTEGER_set(si->status, status)) { | |
292 | ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB); | |
293 | goto err; | |
294 | } | |
295 | if (text) { | |
296 | if ((utf8_text = ASN1_UTF8STRING_new()) == NULL | |
297 | || !ASN1_STRING_set(utf8_text, text, strlen(text))) { | |
298 | ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB); | |
299 | goto err; | |
300 | } | |
301 | if (si->text == NULL | |
302 | && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL) { | |
303 | ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB); | |
304 | goto err; | |
305 | } | |
306 | if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) { | |
307 | ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB); | |
308 | goto err; | |
309 | } | |
310 | utf8_text = NULL; /* Ownership is lost. */ | |
311 | } | |
312 | if (!TS_RESP_set_status_info(ctx->response, si)) { | |
313 | ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB); | |
314 | goto err; | |
315 | } | |
316 | ret = 1; | |
317 | err: | |
318 | TS_STATUS_INFO_free(si); | |
319 | ASN1_UTF8STRING_free(utf8_text); | |
320 | return ret; | |
321 | } | |
322 | ||
323 | int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, | |
324 | int status, const char *text) | |
325 | { | |
326 | int ret = 1; | |
327 | TS_STATUS_INFO *si = ctx->response->status_info; | |
328 | ||
329 | if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { | |
330 | ret = TS_RESP_CTX_set_status_info(ctx, status, text); | |
331 | } | |
332 | return ret; | |
333 | } | |
334 | ||
335 | int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) | |
336 | { | |
337 | TS_STATUS_INFO *si = ctx->response->status_info; | |
338 | if (si->failure_info == NULL | |
339 | && (si->failure_info = ASN1_BIT_STRING_new()) == NULL) | |
340 | goto err; | |
341 | if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) | |
342 | goto err; | |
343 | return 1; | |
344 | err: | |
345 | ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB); | |
346 | return 0; | |
347 | } | |
348 | ||
349 | TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) | |
350 | { | |
351 | return ctx->request; | |
352 | } | |
353 | ||
354 | TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) | |
355 | { | |
356 | return ctx->tst_info; | |
357 | } | |
358 | ||
359 | int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, | |
360 | unsigned precision) | |
361 | { | |
362 | if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) | |
363 | return 0; | |
364 | ctx->clock_precision_digits = precision; | |
365 | return 1; | |
366 | } | |
367 | ||
368 | /* Main entry method of the response generation. */ | |
369 | TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) | |
370 | { | |
371 | ASN1_OBJECT *policy; | |
372 | TS_RESP *response; | |
373 | int result = 0; | |
374 | ||
375 | ts_RESP_CTX_init(ctx); | |
376 | ||
377 | if ((ctx->response = TS_RESP_new()) == NULL) { | |
378 | ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB); | |
379 | goto end; | |
380 | } | |
381 | if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) { | |
382 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
383 | "Bad request format or system error."); | |
384 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); | |
385 | goto end; | |
386 | } | |
387 | if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) | |
388 | goto end; | |
389 | if (!ts_RESP_check_request(ctx)) | |
390 | goto end; | |
391 | if ((policy = ts_RESP_get_policy(ctx)) == NULL) | |
392 | goto end; | |
393 | if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL) | |
394 | goto end; | |
395 | if (!ts_RESP_process_extensions(ctx)) | |
396 | goto end; | |
397 | if (!ts_RESP_sign(ctx)) | |
398 | goto end; | |
399 | result = 1; | |
400 | ||
401 | end: | |
402 | if (!result) { | |
403 | ERR_raise(ERR_LIB_TS, TS_R_RESPONSE_SETUP_ERROR); | |
404 | if (ctx->response != NULL) { | |
405 | if (TS_RESP_CTX_set_status_info_cond(ctx, | |
406 | TS_STATUS_REJECTION, | |
407 | "Error during response " | |
408 | "generation.") == 0) { | |
409 | TS_RESP_free(ctx->response); | |
410 | ctx->response = NULL; | |
411 | } | |
412 | } | |
413 | } | |
414 | response = ctx->response; | |
415 | ctx->response = NULL; /* Ownership will be returned to caller. */ | |
416 | ts_RESP_CTX_cleanup(ctx); | |
417 | return response; | |
418 | } | |
419 | ||
420 | /* Initializes the variable part of the context. */ | |
421 | static void ts_RESP_CTX_init(TS_RESP_CTX *ctx) | |
422 | { | |
423 | ctx->request = NULL; | |
424 | ctx->response = NULL; | |
425 | ctx->tst_info = NULL; | |
426 | } | |
427 | ||
428 | /* Cleans up the variable part of the context. */ | |
429 | static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx) | |
430 | { | |
431 | TS_REQ_free(ctx->request); | |
432 | ctx->request = NULL; | |
433 | TS_RESP_free(ctx->response); | |
434 | ctx->response = NULL; | |
435 | TS_TST_INFO_free(ctx->tst_info); | |
436 | ctx->tst_info = NULL; | |
437 | } | |
438 | ||
439 | /* Checks the format and content of the request. */ | |
440 | static int ts_RESP_check_request(TS_RESP_CTX *ctx) | |
441 | { | |
442 | TS_REQ *request = ctx->request; | |
443 | TS_MSG_IMPRINT *msg_imprint; | |
444 | X509_ALGOR *md_alg; | |
445 | char md_alg_name[OSSL_MAX_NAME_SIZE]; | |
446 | const ASN1_OCTET_STRING *digest; | |
447 | const EVP_MD *md = NULL; | |
448 | int i; | |
449 | ||
450 | if (TS_REQ_get_version(request) != 1) { | |
451 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
452 | "Bad request version."); | |
453 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); | |
454 | return 0; | |
455 | } | |
456 | ||
457 | msg_imprint = request->msg_imprint; | |
458 | md_alg = msg_imprint->hash_algo; | |
459 | OBJ_obj2txt(md_alg_name, sizeof(md_alg_name), md_alg->algorithm, 0); | |
460 | for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { | |
461 | const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); | |
462 | if (EVP_MD_is_a(current_md, md_alg_name)) | |
463 | md = current_md; | |
464 | } | |
465 | if (!md) { | |
466 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
467 | "Message digest algorithm is " | |
468 | "not supported."); | |
469 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { | |
474 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
475 | "Superfluous message digest " | |
476 | "parameter."); | |
477 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); | |
478 | return 0; | |
479 | } | |
480 | digest = msg_imprint->hashed_msg; | |
481 | if (digest->length != EVP_MD_get_size(md)) { | |
482 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
483 | "Bad message digest."); | |
484 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); | |
485 | return 0; | |
486 | } | |
487 | ||
488 | return 1; | |
489 | } | |
490 | ||
491 | /* Returns the TSA policy based on the requested and acceptable policies. */ | |
492 | static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx) | |
493 | { | |
494 | ASN1_OBJECT *requested = ctx->request->policy_id; | |
495 | ASN1_OBJECT *policy = NULL; | |
496 | int i; | |
497 | ||
498 | if (ctx->default_policy == NULL) { | |
499 | ERR_raise(ERR_LIB_TS, TS_R_INVALID_NULL_POINTER); | |
500 | return NULL; | |
501 | } | |
502 | if (!requested || !OBJ_cmp(requested, ctx->default_policy)) | |
503 | policy = ctx->default_policy; | |
504 | ||
505 | /* Check if the policy is acceptable. */ | |
506 | for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { | |
507 | ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); | |
508 | if (!OBJ_cmp(requested, current)) | |
509 | policy = current; | |
510 | } | |
511 | if (policy == NULL) { | |
512 | ERR_raise(ERR_LIB_TS, TS_R_UNACCEPTABLE_POLICY); | |
513 | TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, | |
514 | "Requested policy is not " "supported."); | |
515 | TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); | |
516 | } | |
517 | return policy; | |
518 | } | |
519 | ||
520 | /* Creates the TS_TST_INFO object based on the settings of the context. */ | |
521 | static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx, | |
522 | ASN1_OBJECT *policy) | |
523 | { | |
524 | int result = 0; | |
525 | TS_TST_INFO *tst_info = NULL; | |
526 | ASN1_INTEGER *serial = NULL; | |
527 | ASN1_GENERALIZEDTIME *asn1_time = NULL; | |
528 | long sec, usec; | |
529 | TS_ACCURACY *accuracy = NULL; | |
530 | const ASN1_INTEGER *nonce; | |
531 | GENERAL_NAME *tsa_name = NULL; | |
532 | ||
533 | if ((tst_info = TS_TST_INFO_new()) == NULL) | |
534 | goto end; | |
535 | if (!TS_TST_INFO_set_version(tst_info, 1)) | |
536 | goto end; | |
537 | if (!TS_TST_INFO_set_policy_id(tst_info, policy)) | |
538 | goto end; | |
539 | if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) | |
540 | goto end; | |
541 | if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL | |
542 | || !TS_TST_INFO_set_serial(tst_info, serial)) | |
543 | goto end; | |
544 | if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec) | |
545 | || (asn1_time = | |
546 | TS_RESP_set_genTime_with_precision(NULL, sec, usec, | |
547 | ctx->clock_precision_digits)) == NULL | |
548 | || !TS_TST_INFO_set_time(tst_info, asn1_time)) | |
549 | goto end; | |
550 | ||
551 | if ((ctx->seconds || ctx->millis || ctx->micros) | |
552 | && (accuracy = TS_ACCURACY_new()) == NULL) | |
553 | goto end; | |
554 | if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) | |
555 | goto end; | |
556 | if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) | |
557 | goto end; | |
558 | if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) | |
559 | goto end; | |
560 | if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) | |
561 | goto end; | |
562 | ||
563 | if ((ctx->flags & TS_ORDERING) | |
564 | && !TS_TST_INFO_set_ordering(tst_info, 1)) | |
565 | goto end; | |
566 | ||
567 | if ((nonce = ctx->request->nonce) != NULL | |
568 | && !TS_TST_INFO_set_nonce(tst_info, nonce)) | |
569 | goto end; | |
570 | ||
571 | if (ctx->flags & TS_TSA_NAME) { | |
572 | if ((tsa_name = GENERAL_NAME_new()) == NULL) | |
573 | goto end; | |
574 | tsa_name->type = GEN_DIRNAME; | |
575 | tsa_name->d.dirn = | |
576 | X509_NAME_dup(X509_get_subject_name(ctx->signer_cert)); | |
577 | if (!tsa_name->d.dirn) | |
578 | goto end; | |
579 | if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) | |
580 | goto end; | |
581 | } | |
582 | ||
583 | result = 1; | |
584 | end: | |
585 | if (!result) { | |
586 | TS_TST_INFO_free(tst_info); | |
587 | tst_info = NULL; | |
588 | ERR_raise(ERR_LIB_TS, TS_R_TST_INFO_SETUP_ERROR); | |
589 | TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, | |
590 | "Error during TSTInfo " | |
591 | "generation."); | |
592 | } | |
593 | GENERAL_NAME_free(tsa_name); | |
594 | TS_ACCURACY_free(accuracy); | |
595 | ASN1_GENERALIZEDTIME_free(asn1_time); | |
596 | ASN1_INTEGER_free(serial); | |
597 | ||
598 | return tst_info; | |
599 | } | |
600 | ||
601 | /* Processing the extensions of the request. */ | |
602 | static int ts_RESP_process_extensions(TS_RESP_CTX *ctx) | |
603 | { | |
604 | STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions; | |
605 | int i; | |
606 | int ok = 1; | |
607 | ||
608 | for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { | |
609 | X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); | |
610 | /* | |
611 | * The last argument was previously (void *)ctx->extension_cb, | |
612 | * but ISO C doesn't permit converting a function pointer to void *. | |
613 | * For lack of better information, I'm placing a NULL there instead. | |
614 | * The callback can pick its own address out from the ctx anyway... | |
615 | */ | |
616 | ok = (*ctx->extension_cb) (ctx, ext, NULL); | |
617 | } | |
618 | ||
619 | return ok; | |
620 | } | |
621 | ||
622 | /* Functions for signing the TS_TST_INFO structure of the context. */ | |
623 | static int ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO *si, | |
624 | const ESS_SIGNING_CERT *sc) | |
625 | { | |
626 | ASN1_STRING *seq = NULL; | |
627 | int len = i2d_ESS_SIGNING_CERT(sc, NULL); | |
628 | unsigned char *p, *pp = OPENSSL_malloc(len); | |
629 | ||
630 | if (pp == NULL) | |
631 | return 0; | |
632 | ||
633 | p = pp; | |
634 | i2d_ESS_SIGNING_CERT(sc, &p); | |
635 | if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { | |
636 | ASN1_STRING_free(seq); | |
637 | OPENSSL_free(pp); | |
638 | return 0; | |
639 | } | |
640 | ||
641 | OPENSSL_free(pp); | |
642 | return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificate, | |
643 | V_ASN1_SEQUENCE, seq); | |
644 | } | |
645 | ||
646 | static int ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO *si, | |
647 | const ESS_SIGNING_CERT_V2 *sc) | |
648 | { | |
649 | ASN1_STRING *seq = NULL; | |
650 | int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL); | |
651 | unsigned char *p, *pp = OPENSSL_malloc(len); | |
652 | ||
653 | if (pp == NULL) | |
654 | return 0; | |
655 | ||
656 | p = pp; | |
657 | i2d_ESS_SIGNING_CERT_V2(sc, &p); | |
658 | if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { | |
659 | ASN1_STRING_free(seq); | |
660 | OPENSSL_free(pp); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | OPENSSL_free(pp); | |
665 | return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificateV2, | |
666 | V_ASN1_SEQUENCE, seq); | |
667 | } | |
668 | ||
669 | static int ts_RESP_sign(TS_RESP_CTX *ctx) | |
670 | { | |
671 | int ret = 0; | |
672 | PKCS7 *p7 = NULL; | |
673 | PKCS7_SIGNER_INFO *si; | |
674 | STACK_OF(X509) *certs; /* Certificates to include in sc. */ | |
675 | ESS_SIGNING_CERT_V2 *sc2 = NULL; | |
676 | ESS_SIGNING_CERT *sc = NULL; | |
677 | ASN1_OBJECT *oid; | |
678 | BIO *p7bio = NULL; | |
679 | int i; | |
680 | EVP_MD *signer_md = NULL; | |
681 | ||
682 | if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) { | |
683 | ERR_raise(ERR_LIB_TS, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); | |
684 | goto err; | |
685 | } | |
686 | ||
687 | if ((p7 = PKCS7_new_ex(ctx->libctx, ctx->propq)) == NULL) { | |
688 | ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB); | |
689 | goto err; | |
690 | } | |
691 | if (!PKCS7_set_type(p7, NID_pkcs7_signed)) | |
692 | goto err; | |
693 | if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) | |
694 | goto err; | |
695 | ||
696 | if (ctx->request->cert_req) { | |
697 | PKCS7_add_certificate(p7, ctx->signer_cert); | |
698 | if (ctx->certs) { | |
699 | for (i = 0; i < sk_X509_num(ctx->certs); ++i) { | |
700 | X509 *cert = sk_X509_value(ctx->certs, i); | |
701 | PKCS7_add_certificate(p7, cert); | |
702 | } | |
703 | } | |
704 | } | |
705 | ||
706 | if (ctx->signer_md == NULL) | |
707 | signer_md = EVP_MD_fetch(ctx->libctx, "SHA256", ctx->propq); | |
708 | else if (EVP_MD_get0_provider(ctx->signer_md) == NULL) | |
709 | signer_md = EVP_MD_fetch(ctx->libctx, EVP_MD_get0_name(ctx->signer_md), | |
710 | ctx->propq); | |
711 | else | |
712 | signer_md = (EVP_MD *)ctx->signer_md; | |
713 | ||
714 | if ((si = PKCS7_add_signature(p7, ctx->signer_cert, | |
715 | ctx->signer_key, signer_md)) == NULL) { | |
716 | ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNATURE_ERROR); | |
717 | goto err; | |
718 | } | |
719 | ||
720 | oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); | |
721 | if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, | |
722 | V_ASN1_OBJECT, oid)) { | |
723 | ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); | |
724 | goto err; | |
725 | } | |
726 | ||
727 | certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL; | |
728 | if (ctx->ess_cert_id_digest == NULL | |
729 | || EVP_MD_is_a(ctx->ess_cert_id_digest, SN_sha1)) { | |
730 | if ((sc = OSSL_ESS_signing_cert_new_init(ctx->signer_cert, | |
731 | certs, 0)) == NULL) | |
732 | goto err; | |
733 | ||
734 | if (!ossl_ess_add1_signing_cert(si, sc)) { | |
735 | ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_ERROR); | |
736 | goto err; | |
737 | } | |
738 | } else { | |
739 | sc2 = OSSL_ESS_signing_cert_v2_new_init(ctx->ess_cert_id_digest, | |
740 | ctx->signer_cert, certs, 0); | |
741 | if (sc2 == NULL) | |
742 | goto err; | |
743 | ||
744 | if (!ossl_ess_add1_signing_cert_v2(si, sc2)) { | |
745 | ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR); | |
746 | goto err; | |
747 | } | |
748 | } | |
749 | ||
750 | if (!ts_TST_INFO_content_new(p7)) | |
751 | goto err; | |
752 | if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) { | |
753 | ERR_raise(ERR_LIB_TS, ERR_R_PKCS7_LIB); | |
754 | goto err; | |
755 | } | |
756 | if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) { | |
757 | ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN); | |
758 | goto err; | |
759 | } | |
760 | if (!PKCS7_dataFinal(p7, p7bio)) { | |
761 | ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN); | |
762 | goto err; | |
763 | } | |
764 | TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info); | |
765 | p7 = NULL; /* Ownership is lost. */ | |
766 | ctx->tst_info = NULL; /* Ownership is lost. */ | |
767 | ||
768 | ret = 1; | |
769 | err: | |
770 | if (signer_md != ctx->signer_md) | |
771 | EVP_MD_free(signer_md); | |
772 | ||
773 | if (!ret) | |
774 | TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, | |
775 | "Error during signature " | |
776 | "generation."); | |
777 | BIO_free_all(p7bio); | |
778 | ESS_SIGNING_CERT_V2_free(sc2); | |
779 | ESS_SIGNING_CERT_free(sc); | |
780 | PKCS7_free(p7); | |
781 | return ret; | |
782 | } | |
783 | ||
784 | static int ts_TST_INFO_content_new(PKCS7 *p7) | |
785 | { | |
786 | PKCS7 *ret = NULL; | |
787 | ASN1_OCTET_STRING *octet_string = NULL; | |
788 | ||
789 | /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ | |
790 | if ((ret = PKCS7_new()) == NULL) | |
791 | goto err; | |
792 | if ((ret->d.other = ASN1_TYPE_new()) == NULL) | |
793 | goto err; | |
794 | ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); | |
795 | if ((octet_string = ASN1_OCTET_STRING_new()) == NULL) | |
796 | goto err; | |
797 | ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); | |
798 | octet_string = NULL; | |
799 | ||
800 | /* Add encapsulated content to signed PKCS7 structure. */ | |
801 | if (!PKCS7_set_content(p7, ret)) | |
802 | goto err; | |
803 | ||
804 | return 1; | |
805 | err: | |
806 | ASN1_OCTET_STRING_free(octet_string); | |
807 | PKCS7_free(ret); | |
808 | return 0; | |
809 | } | |
810 | ||
811 | static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision( | |
812 | ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec, | |
813 | unsigned precision) | |
814 | { | |
815 | time_t time_sec = (time_t)sec; | |
816 | struct tm *tm = NULL, tm_result; | |
817 | char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; | |
818 | char *p = genTime_str; | |
819 | char *p_end = genTime_str + sizeof(genTime_str); | |
820 | ||
821 | if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) | |
822 | goto err; | |
823 | ||
824 | if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL) | |
825 | goto err; | |
826 | ||
827 | /* | |
828 | * Put "genTime_str" in GeneralizedTime format. We work around the | |
829 | * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST | |
830 | * NOT include fractional seconds") and OpenSSL related functions to | |
831 | * meet the rfc3161 requirement: "GeneralizedTime syntax can include | |
832 | * fraction-of-second details". | |
833 | */ | |
834 | p += BIO_snprintf(p, p_end - p, | |
835 | "%04d%02d%02d%02d%02d%02d", | |
836 | tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, | |
837 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
838 | if (precision > 0) { | |
839 | BIO_snprintf(p, 2 + precision, ".%06ld", usec); | |
840 | p += strlen(p); | |
841 | ||
842 | /* | |
843 | * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the | |
844 | * following restrictions for a DER-encoding, which OpenSSL | |
845 | * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't | |
846 | * support: "The encoding MUST terminate with a "Z" (which means | |
847 | * "Zulu" time). The decimal point element, if present, MUST be the | |
848 | * point option ".". The fractional-seconds elements, if present, | |
849 | * MUST omit all trailing 0's; if the elements correspond to 0, they | |
850 | * MUST be wholly omitted, and the decimal point element also MUST be | |
851 | * omitted." | |
852 | */ | |
853 | /* | |
854 | * Remove trailing zeros. The dot guarantees the exit condition of | |
855 | * this loop even if all the digits are zero. | |
856 | */ | |
857 | while (*--p == '0') | |
858 | continue; | |
859 | if (*p != '.') | |
860 | ++p; | |
861 | } | |
862 | *p++ = 'Z'; | |
863 | *p++ = '\0'; | |
864 | ||
865 | if (asn1_time == NULL | |
866 | && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL) | |
867 | goto err; | |
868 | if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { | |
869 | ASN1_GENERALIZEDTIME_free(asn1_time); | |
870 | goto err; | |
871 | } | |
872 | return asn1_time; | |
873 | ||
874 | err: | |
875 | ERR_raise(ERR_LIB_TS, TS_R_COULD_NOT_SET_TIME); | |
876 | return NULL; | |
877 | } | |
878 | ||
879 | int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md) | |
880 | { | |
881 | ctx->ess_cert_id_digest = md; | |
882 | return 1; | |
883 | } |