1 /*
2 * Copyright 2006-2025 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. */
def_serial_cb(struct TS_resp_ctx * ctx,void * data)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
def_time_cb(struct TS_resp_ctx * ctx,void * data,long * sec,long * usec)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
def_extension_cb(struct TS_resp_ctx * ctx,X509_EXTENSION * ext,void * data)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
TS_RESP_CTX_new_ex(OSSL_LIB_CTX * libctx,const char * propq)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
TS_RESP_CTX_new(void)116 TS_RESP_CTX *TS_RESP_CTX_new(void)
117 {
118 return TS_RESP_CTX_new_ex(NULL, NULL);
119 }
120
TS_RESP_CTX_free(TS_RESP_CTX * ctx)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
TS_RESP_CTX_set_signer_cert(TS_RESP_CTX * ctx,X509 * signer)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 if (!X509_up_ref(signer))
146 return 0;
147
148 X509_free(ctx->signer_cert);
149 ctx->signer_cert = signer;
150
151 return 1;
152 }
153
TS_RESP_CTX_set_signer_key(TS_RESP_CTX * ctx,EVP_PKEY * key)154 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
155 {
156 if (!EVP_PKEY_up_ref(key))
157 return 0;
158
159 EVP_PKEY_free(ctx->signer_key);
160 ctx->signer_key = key;
161
162 return 1;
163 }
164
TS_RESP_CTX_set_signer_digest(TS_RESP_CTX * ctx,const EVP_MD * md)165 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
166 {
167 ctx->signer_md = md;
168 return 1;
169 }
170
TS_RESP_CTX_set_def_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * def_policy)171 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
172 {
173 ASN1_OBJECT_free(ctx->default_policy);
174 if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
175 goto err;
176 return 1;
177 err:
178 ERR_raise(ERR_LIB_TS, ERR_R_OBJ_LIB);
179 return 0;
180 }
181
TS_RESP_CTX_set_certs(TS_RESP_CTX * ctx,STACK_OF (X509)* certs)182 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
183 {
184 OSSL_STACK_OF_X509_free(ctx->certs);
185 ctx->certs = NULL;
186
187 return certs == NULL || (ctx->certs = X509_chain_up_ref(certs)) != NULL;
188 }
189
TS_RESP_CTX_add_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * policy)190 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
191 {
192 ASN1_OBJECT *copy = NULL;
193
194 if (ctx->policies == NULL
195 && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL) {
196 ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
197 goto err;
198 }
199 if ((copy = OBJ_dup(policy)) == NULL) {
200 ERR_raise(ERR_LIB_TS, ERR_R_OBJ_LIB);
201 goto err;
202 }
203 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) {
204 ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
205 goto err;
206 }
207
208 return 1;
209 err:
210 ASN1_OBJECT_free(copy);
211 return 0;
212 }
213
TS_RESP_CTX_add_md(TS_RESP_CTX * ctx,const EVP_MD * md)214 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
215 {
216 if (ctx->mds == NULL
217 && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
218 goto err;
219 if (!sk_EVP_MD_push(ctx->mds, md))
220 goto err;
221
222 return 1;
223 err:
224 ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
225 return 0;
226 }
227
228 #define TS_RESP_CTX_accuracy_free(ctx) \
229 ASN1_INTEGER_free(ctx->seconds); \
230 ctx->seconds = NULL; \
231 ASN1_INTEGER_free(ctx->millis); \
232 ctx->millis = NULL; \
233 ASN1_INTEGER_free(ctx->micros); \
234 ctx->micros = NULL;
235
TS_RESP_CTX_set_accuracy(TS_RESP_CTX * ctx,int secs,int millis,int micros)236 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
237 int secs, int millis, int micros)
238 {
239
240 TS_RESP_CTX_accuracy_free(ctx);
241 if (secs
242 && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
243 || !ASN1_INTEGER_set(ctx->seconds, secs)))
244 goto err;
245 if (millis
246 && ((ctx->millis = ASN1_INTEGER_new()) == NULL
247 || !ASN1_INTEGER_set(ctx->millis, millis)))
248 goto err;
249 if (micros
250 && ((ctx->micros = ASN1_INTEGER_new()) == NULL
251 || !ASN1_INTEGER_set(ctx->micros, micros)))
252 goto err;
253
254 return 1;
255 err:
256 TS_RESP_CTX_accuracy_free(ctx);
257 ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
258 return 0;
259 }
260
TS_RESP_CTX_add_flags(TS_RESP_CTX * ctx,int flags)261 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
262 {
263 ctx->flags |= flags;
264 }
265
TS_RESP_CTX_set_serial_cb(TS_RESP_CTX * ctx,TS_serial_cb cb,void * data)266 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
267 {
268 ctx->serial_cb = cb;
269 ctx->serial_cb_data = data;
270 }
271
TS_RESP_CTX_set_time_cb(TS_RESP_CTX * ctx,TS_time_cb cb,void * data)272 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
273 {
274 ctx->time_cb = cb;
275 ctx->time_cb_data = data;
276 }
277
TS_RESP_CTX_set_extension_cb(TS_RESP_CTX * ctx,TS_extension_cb cb,void * data)278 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
279 TS_extension_cb cb, void *data)
280 {
281 ctx->extension_cb = cb;
282 ctx->extension_cb_data = data;
283 }
284
TS_RESP_CTX_set_status_info(TS_RESP_CTX * ctx,int status,const char * text)285 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
286 int status, const char *text)
287 {
288 TS_STATUS_INFO *si = NULL;
289 ASN1_UTF8STRING *utf8_text = NULL;
290 int ret = 0;
291
292 if ((si = TS_STATUS_INFO_new()) == NULL) {
293 ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB);
294 goto err;
295 }
296 if (!ASN1_INTEGER_set(si->status, status)) {
297 ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
298 goto err;
299 }
300 if (text) {
301 if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
302 || !ASN1_STRING_set(utf8_text, text, strlen(text))) {
303 ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
304 goto err;
305 }
306 if (si->text == NULL
307 && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL) {
308 ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
309 goto err;
310 }
311 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) {
312 ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
313 goto err;
314 }
315 utf8_text = NULL; /* Ownership is lost. */
316 }
317 if (!TS_RESP_set_status_info(ctx->response, si)) {
318 ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB);
319 goto err;
320 }
321 ret = 1;
322 err:
323 TS_STATUS_INFO_free(si);
324 ASN1_UTF8STRING_free(utf8_text);
325 return ret;
326 }
327
TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX * ctx,int status,const char * text)328 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
329 int status, const char *text)
330 {
331 int ret = 1;
332 TS_STATUS_INFO *si = ctx->response->status_info;
333
334 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
335 ret = TS_RESP_CTX_set_status_info(ctx, status, text);
336 }
337 return ret;
338 }
339
TS_RESP_CTX_add_failure_info(TS_RESP_CTX * ctx,int failure)340 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
341 {
342 TS_STATUS_INFO *si = ctx->response->status_info;
343 if (si->failure_info == NULL
344 && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
345 goto err;
346 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
347 goto err;
348 return 1;
349 err:
350 ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
351 return 0;
352 }
353
TS_RESP_CTX_get_request(TS_RESP_CTX * ctx)354 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
355 {
356 return ctx->request;
357 }
358
TS_RESP_CTX_get_tst_info(TS_RESP_CTX * ctx)359 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
360 {
361 return ctx->tst_info;
362 }
363
TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX * ctx,unsigned precision)364 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
365 unsigned precision)
366 {
367 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
368 return 0;
369 ctx->clock_precision_digits = precision;
370 return 1;
371 }
372
373 /* Main entry method of the response generation. */
TS_RESP_create_response(TS_RESP_CTX * ctx,BIO * req_bio)374 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
375 {
376 ASN1_OBJECT *policy;
377 TS_RESP *response;
378 int result = 0;
379
380 ts_RESP_CTX_init(ctx);
381
382 if ((ctx->response = TS_RESP_new()) == NULL) {
383 ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB);
384 goto end;
385 }
386 if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
387 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
388 "Bad request format or system error.");
389 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
390 goto end;
391 }
392 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
393 goto end;
394 if (!ts_RESP_check_request(ctx))
395 goto end;
396 if ((policy = ts_RESP_get_policy(ctx)) == NULL)
397 goto end;
398 if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
399 goto end;
400 if (!ts_RESP_process_extensions(ctx))
401 goto end;
402 if (!ts_RESP_sign(ctx))
403 goto end;
404 result = 1;
405
406 end:
407 if (!result) {
408 ERR_raise(ERR_LIB_TS, TS_R_RESPONSE_SETUP_ERROR);
409 if (ctx->response != NULL) {
410 if (TS_RESP_CTX_set_status_info_cond(ctx,
411 TS_STATUS_REJECTION,
412 "Error during response "
413 "generation.") == 0) {
414 TS_RESP_free(ctx->response);
415 ctx->response = NULL;
416 }
417 }
418 }
419 response = ctx->response;
420 ctx->response = NULL; /* Ownership will be returned to caller. */
421 ts_RESP_CTX_cleanup(ctx);
422 return response;
423 }
424
425 /* Initializes the variable part of the context. */
ts_RESP_CTX_init(TS_RESP_CTX * ctx)426 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
427 {
428 ctx->request = NULL;
429 ctx->response = NULL;
430 ctx->tst_info = NULL;
431 }
432
433 /* Cleans up the variable part of the context. */
ts_RESP_CTX_cleanup(TS_RESP_CTX * ctx)434 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
435 {
436 TS_REQ_free(ctx->request);
437 ctx->request = NULL;
438 TS_RESP_free(ctx->response);
439 ctx->response = NULL;
440 TS_TST_INFO_free(ctx->tst_info);
441 ctx->tst_info = NULL;
442 }
443
444 /* Checks the format and content of the request. */
ts_RESP_check_request(TS_RESP_CTX * ctx)445 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
446 {
447 TS_REQ *request = ctx->request;
448 TS_MSG_IMPRINT *msg_imprint;
449 X509_ALGOR *md_alg;
450 char md_alg_name[OSSL_MAX_NAME_SIZE];
451 const ASN1_OCTET_STRING *digest;
452 const EVP_MD *md = NULL;
453 int i, md_size;
454
455 if (TS_REQ_get_version(request) != 1) {
456 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
457 "Bad request version.");
458 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
459 return 0;
460 }
461
462 msg_imprint = request->msg_imprint;
463 md_alg = msg_imprint->hash_algo;
464 OBJ_obj2txt(md_alg_name, sizeof(md_alg_name), md_alg->algorithm, 0);
465 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
466 const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
467 if (EVP_MD_is_a(current_md, md_alg_name))
468 md = current_md;
469 }
470 if (!md) {
471 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
472 "Message digest algorithm is "
473 "not supported.");
474 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
475 return 0;
476 }
477
478 md_size = EVP_MD_get_size(md);
479 if (md_size <= 0)
480 return 0;
481
482 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
483 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
484 "Superfluous message digest "
485 "parameter.");
486 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
487 return 0;
488 }
489 digest = msg_imprint->hashed_msg;
490 if (digest->length != md_size) {
491 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
492 "Bad message digest.");
493 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
494 return 0;
495 }
496
497 return 1;
498 }
499
500 /* Returns the TSA policy based on the requested and acceptable policies. */
ts_RESP_get_policy(TS_RESP_CTX * ctx)501 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
502 {
503 ASN1_OBJECT *requested = ctx->request->policy_id;
504 ASN1_OBJECT *policy = NULL;
505 int i;
506
507 if (ctx->default_policy == NULL) {
508 ERR_raise(ERR_LIB_TS, TS_R_INVALID_NULL_POINTER);
509 return NULL;
510 }
511 if (!requested || !OBJ_cmp(requested, ctx->default_policy))
512 policy = ctx->default_policy;
513
514 /* Check if the policy is acceptable. */
515 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
516 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
517 if (!OBJ_cmp(requested, current))
518 policy = current;
519 }
520 if (policy == NULL) {
521 ERR_raise(ERR_LIB_TS, TS_R_UNACCEPTABLE_POLICY);
522 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
523 "Requested policy is not " "supported.");
524 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
525 }
526 return policy;
527 }
528
529 /* Creates the TS_TST_INFO object based on the settings of the context. */
ts_RESP_create_tst_info(TS_RESP_CTX * ctx,ASN1_OBJECT * policy)530 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
531 ASN1_OBJECT *policy)
532 {
533 int result = 0;
534 TS_TST_INFO *tst_info = NULL;
535 ASN1_INTEGER *serial = NULL;
536 ASN1_GENERALIZEDTIME *asn1_time = NULL;
537 long sec, usec;
538 TS_ACCURACY *accuracy = NULL;
539 const ASN1_INTEGER *nonce;
540 GENERAL_NAME *tsa_name = NULL;
541
542 if ((tst_info = TS_TST_INFO_new()) == NULL)
543 goto end;
544 if (!TS_TST_INFO_set_version(tst_info, 1))
545 goto end;
546 if (!TS_TST_INFO_set_policy_id(tst_info, policy))
547 goto end;
548 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
549 goto end;
550 if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
551 || !TS_TST_INFO_set_serial(tst_info, serial))
552 goto end;
553 if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
554 || (asn1_time =
555 TS_RESP_set_genTime_with_precision(NULL, sec, usec,
556 ctx->clock_precision_digits)) == NULL
557 || !TS_TST_INFO_set_time(tst_info, asn1_time))
558 goto end;
559
560 if ((ctx->seconds || ctx->millis || ctx->micros)
561 && (accuracy = TS_ACCURACY_new()) == NULL)
562 goto end;
563 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
564 goto end;
565 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
566 goto end;
567 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
568 goto end;
569 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
570 goto end;
571
572 if ((ctx->flags & TS_ORDERING)
573 && !TS_TST_INFO_set_ordering(tst_info, 1))
574 goto end;
575
576 if ((nonce = ctx->request->nonce) != NULL
577 && !TS_TST_INFO_set_nonce(tst_info, nonce))
578 goto end;
579
580 if (ctx->flags & TS_TSA_NAME) {
581 if ((tsa_name = GENERAL_NAME_new()) == NULL)
582 goto end;
583 tsa_name->type = GEN_DIRNAME;
584 tsa_name->d.dirn =
585 X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
586 if (!tsa_name->d.dirn)
587 goto end;
588 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
589 goto end;
590 }
591
592 result = 1;
593 end:
594 if (!result) {
595 TS_TST_INFO_free(tst_info);
596 tst_info = NULL;
597 ERR_raise(ERR_LIB_TS, TS_R_TST_INFO_SETUP_ERROR);
598 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
599 "Error during TSTInfo "
600 "generation.");
601 }
602 GENERAL_NAME_free(tsa_name);
603 TS_ACCURACY_free(accuracy);
604 ASN1_GENERALIZEDTIME_free(asn1_time);
605 ASN1_INTEGER_free(serial);
606
607 return tst_info;
608 }
609
610 /* Processing the extensions of the request. */
ts_RESP_process_extensions(TS_RESP_CTX * ctx)611 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
612 {
613 STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
614 int i;
615 int ok = 1;
616
617 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
618 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
619 /*
620 * The last argument was previously (void *)ctx->extension_cb,
621 * but ISO C doesn't permit converting a function pointer to void *.
622 * For lack of better information, I'm placing a NULL there instead.
623 * The callback can pick its own address out from the ctx anyway...
624 */
625 ok = (*ctx->extension_cb) (ctx, ext, NULL);
626 }
627
628 return ok;
629 }
630
631 /* Functions for signing the TS_TST_INFO structure of the context. */
ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO * si,const ESS_SIGNING_CERT * sc)632 static int ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO *si,
633 const ESS_SIGNING_CERT *sc)
634 {
635 ASN1_STRING *seq = NULL;
636 int len = i2d_ESS_SIGNING_CERT(sc, NULL);
637 unsigned char *p, *pp = OPENSSL_malloc(len);
638
639 if (pp == NULL)
640 return 0;
641
642 p = pp;
643 i2d_ESS_SIGNING_CERT(sc, &p);
644 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
645 ASN1_STRING_free(seq);
646 OPENSSL_free(pp);
647 return 0;
648 }
649
650 OPENSSL_free(pp);
651 if (!PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificate,
652 V_ASN1_SEQUENCE, seq)) {
653 ASN1_STRING_free(seq);
654 return 0;
655 }
656 return 1;
657 }
658
ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO * si,const ESS_SIGNING_CERT_V2 * sc)659 static int ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO *si,
660 const ESS_SIGNING_CERT_V2 *sc)
661 {
662 ASN1_STRING *seq = NULL;
663 int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
664 unsigned char *p, *pp = OPENSSL_malloc(len);
665
666 if (pp == NULL)
667 return 0;
668
669 p = pp;
670 i2d_ESS_SIGNING_CERT_V2(sc, &p);
671 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
672 ASN1_STRING_free(seq);
673 OPENSSL_free(pp);
674 return 0;
675 }
676
677 OPENSSL_free(pp);
678 if (!PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificateV2,
679 V_ASN1_SEQUENCE, seq)) {
680 ASN1_STRING_free(seq);
681 return 0;
682 }
683 return 1;
684 }
685
ts_RESP_sign(TS_RESP_CTX * ctx)686 static int ts_RESP_sign(TS_RESP_CTX *ctx)
687 {
688 int ret = 0;
689 PKCS7 *p7 = NULL;
690 PKCS7_SIGNER_INFO *si;
691 STACK_OF(X509) *certs; /* Certificates to include in sc. */
692 ESS_SIGNING_CERT_V2 *sc2 = NULL;
693 ESS_SIGNING_CERT *sc = NULL;
694 ASN1_OBJECT *oid;
695 BIO *p7bio = NULL;
696 int i;
697 EVP_MD *signer_md = NULL;
698
699 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
700 ERR_raise(ERR_LIB_TS, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
701 goto err;
702 }
703
704 if ((p7 = PKCS7_new_ex(ctx->libctx, ctx->propq)) == NULL) {
705 ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
706 goto err;
707 }
708 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
709 goto err;
710 if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
711 goto err;
712
713 if (ctx->request->cert_req) {
714 PKCS7_add_certificate(p7, ctx->signer_cert);
715 if (ctx->certs) {
716 for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
717 X509 *cert = sk_X509_value(ctx->certs, i);
718 PKCS7_add_certificate(p7, cert);
719 }
720 }
721 }
722
723 if (ctx->signer_md == NULL)
724 signer_md = EVP_MD_fetch(ctx->libctx, "SHA256", ctx->propq);
725 else if (EVP_MD_get0_provider(ctx->signer_md) == NULL)
726 signer_md = EVP_MD_fetch(ctx->libctx, EVP_MD_get0_name(ctx->signer_md),
727 ctx->propq);
728 else
729 signer_md = (EVP_MD *)ctx->signer_md;
730
731 if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
732 ctx->signer_key, signer_md)) == NULL) {
733 ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
734 goto err;
735 }
736
737 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
738 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
739 V_ASN1_OBJECT, oid)) {
740 ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
741 goto err;
742 }
743
744 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
745 if (ctx->ess_cert_id_digest == NULL
746 || EVP_MD_is_a(ctx->ess_cert_id_digest, SN_sha1)) {
747 if ((sc = OSSL_ESS_signing_cert_new_init(ctx->signer_cert,
748 certs, 0)) == NULL)
749 goto err;
750
751 if (!ossl_ess_add1_signing_cert(si, sc)) {
752 ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
753 goto err;
754 }
755 } else {
756 sc2 = OSSL_ESS_signing_cert_v2_new_init(ctx->ess_cert_id_digest,
757 ctx->signer_cert, certs, 0);
758 if (sc2 == NULL)
759 goto err;
760
761 if (!ossl_ess_add1_signing_cert_v2(si, sc2)) {
762 ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR);
763 goto err;
764 }
765 }
766
767 if (!ts_TST_INFO_content_new(p7))
768 goto err;
769 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
770 ERR_raise(ERR_LIB_TS, ERR_R_PKCS7_LIB);
771 goto err;
772 }
773 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
774 ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
775 goto err;
776 }
777 if (!PKCS7_dataFinal(p7, p7bio)) {
778 ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
779 goto err;
780 }
781 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
782 p7 = NULL; /* Ownership is lost. */
783 ctx->tst_info = NULL; /* Ownership is lost. */
784
785 ret = 1;
786 err:
787 if (signer_md != ctx->signer_md)
788 EVP_MD_free(signer_md);
789
790 if (!ret)
791 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
792 "Error during signature "
793 "generation.");
794 BIO_free_all(p7bio);
795 ESS_SIGNING_CERT_V2_free(sc2);
796 ESS_SIGNING_CERT_free(sc);
797 PKCS7_free(p7);
798 return ret;
799 }
800
ts_TST_INFO_content_new(PKCS7 * p7)801 static int ts_TST_INFO_content_new(PKCS7 *p7)
802 {
803 PKCS7 *ret = NULL;
804 ASN1_OCTET_STRING *octet_string = NULL;
805
806 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
807 if ((ret = PKCS7_new()) == NULL)
808 goto err;
809 if ((ret->d.other = ASN1_TYPE_new()) == NULL)
810 goto err;
811 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
812 if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
813 goto err;
814 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
815 octet_string = NULL;
816
817 /* Add encapsulated content to signed PKCS7 structure. */
818 if (!PKCS7_set_content(p7, ret))
819 goto err;
820
821 return 1;
822 err:
823 ASN1_OCTET_STRING_free(octet_string);
824 PKCS7_free(ret);
825 return 0;
826 }
827
TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME * asn1_time,long sec,long usec,unsigned precision)828 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
829 ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec,
830 unsigned precision)
831 {
832 time_t time_sec = (time_t)sec;
833 struct tm *tm = NULL, tm_result;
834 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
835 char *p = genTime_str;
836 char *p_end = genTime_str + sizeof(genTime_str);
837
838 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
839 goto err;
840
841 if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL)
842 goto err;
843
844 /*
845 * Put "genTime_str" in GeneralizedTime format. We work around the
846 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
847 * NOT include fractional seconds") and OpenSSL related functions to
848 * meet the rfc3161 requirement: "GeneralizedTime syntax can include
849 * fraction-of-second details".
850 */
851 p += BIO_snprintf(p, p_end - p,
852 "%04d%02d%02d%02d%02d%02d",
853 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
854 tm->tm_hour, tm->tm_min, tm->tm_sec);
855 if (precision > 0) {
856 BIO_snprintf(p, 2 + precision, ".%06ld", usec);
857 p += strlen(p);
858
859 /*
860 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
861 * following restrictions for a DER-encoding, which OpenSSL
862 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
863 * support: "The encoding MUST terminate with a "Z" (which means
864 * "Zulu" time). The decimal point element, if present, MUST be the
865 * point option ".". The fractional-seconds elements, if present,
866 * MUST omit all trailing 0's; if the elements correspond to 0, they
867 * MUST be wholly omitted, and the decimal point element also MUST be
868 * omitted."
869 */
870 /*
871 * Remove trailing zeros. The dot guarantees the exit condition of
872 * this loop even if all the digits are zero.
873 */
874 while (*--p == '0')
875 continue;
876 if (*p != '.')
877 ++p;
878 }
879 *p++ = 'Z';
880 *p++ = '\0';
881
882 if (asn1_time == NULL
883 && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
884 goto err;
885 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
886 ASN1_GENERALIZEDTIME_free(asn1_time);
887 goto err;
888 }
889 return asn1_time;
890
891 err:
892 ERR_raise(ERR_LIB_TS, TS_R_COULD_NOT_SET_TIME);
893 return NULL;
894 }
895
TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX * ctx,const EVP_MD * md)896 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
897 {
898 ctx->ess_cert_id_digest = md;
899 return 1;
900 }
901