1 /*
2 * Copyright 2006-2021 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 "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 "crypto/ess.h"
19 #include "ts_local.h"
20
21 DEFINE_STACK_OF_CONST(EVP_MD)
22
23 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
24 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
25 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
26
27 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx);
28 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
29 static int ts_RESP_check_request(TS_RESP_CTX *ctx);
30 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx);
31 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
32 ASN1_OBJECT *policy);
33 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
34 static int ts_RESP_sign(TS_RESP_CTX *ctx);
35
36 static int ts_TST_INFO_content_new(PKCS7 *p7);
37
38 static ASN1_GENERALIZEDTIME
39 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
40 unsigned);
41
42 /* Default callback for response generation. */
def_serial_cb(struct TS_resp_ctx * ctx,void * data)43 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
44 {
45 ASN1_INTEGER *serial = ASN1_INTEGER_new();
46
47 if (serial == NULL)
48 goto err;
49 if (!ASN1_INTEGER_set(serial, 1))
50 goto err;
51 return serial;
52
53 err:
54 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
55 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
56 "Error during serial number generation.");
57 ASN1_INTEGER_free(serial);
58 return NULL;
59 }
60
61 #if defined(OPENSSL_SYS_UNIX)
62
def_time_cb(struct TS_resp_ctx * ctx,void * data,long * sec,long * usec)63 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
64 long *sec, long *usec)
65 {
66 struct timeval tv;
67 if (gettimeofday(&tv, NULL) != 0) {
68 ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR);
69 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
70 "Time is not available.");
71 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
72 return 0;
73 }
74 *sec = tv.tv_sec;
75 *usec = tv.tv_usec;
76
77 return 1;
78 }
79
80 #else
81
def_time_cb(struct TS_resp_ctx * ctx,void * data,long * sec,long * usec)82 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
83 long *sec, long *usec)
84 {
85 time_t t;
86 if (time(&t) == (time_t)-1) {
87 ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR);
88 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
89 "Time is not available.");
90 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
91 return 0;
92 }
93 *sec = (long)t;
94 *usec = 0;
95
96 return 1;
97 }
98
99 #endif
100
def_extension_cb(struct TS_resp_ctx * ctx,X509_EXTENSION * ext,void * data)101 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
102 void *data)
103 {
104 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
105 "Unsupported extension.");
106 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
107 return 0;
108 }
109
110 /* TS_RESP_CTX management functions. */
111
TS_RESP_CTX_new_ex(OSSL_LIB_CTX * libctx,const char * propq)112 TS_RESP_CTX *TS_RESP_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
113 {
114 TS_RESP_CTX *ctx;
115
116 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
117 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
118 return NULL;
119 }
120
121 if (propq != NULL) {
122 ctx->propq = OPENSSL_strdup(propq);
123 if (ctx->propq == NULL) {
124 OPENSSL_free(ctx);
125 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
126 return NULL;
127 }
128 }
129 ctx->libctx = libctx;
130 ctx->serial_cb = def_serial_cb;
131 ctx->time_cb = def_time_cb;
132 ctx->extension_cb = def_extension_cb;
133
134 return ctx;
135 }
136
TS_RESP_CTX_new(void)137 TS_RESP_CTX *TS_RESP_CTX_new(void)
138 {
139 return TS_RESP_CTX_new_ex(NULL, NULL);
140 }
141
TS_RESP_CTX_free(TS_RESP_CTX * ctx)142 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
143 {
144 if (!ctx)
145 return;
146
147 OPENSSL_free(ctx->propq);
148 X509_free(ctx->signer_cert);
149 EVP_PKEY_free(ctx->signer_key);
150 sk_X509_pop_free(ctx->certs, X509_free);
151 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
152 ASN1_OBJECT_free(ctx->default_policy);
153 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */
154 ASN1_INTEGER_free(ctx->seconds);
155 ASN1_INTEGER_free(ctx->millis);
156 ASN1_INTEGER_free(ctx->micros);
157 OPENSSL_free(ctx);
158 }
159
TS_RESP_CTX_set_signer_cert(TS_RESP_CTX * ctx,X509 * signer)160 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
161 {
162 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
163 ERR_raise(ERR_LIB_TS, TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
164 return 0;
165 }
166 X509_free(ctx->signer_cert);
167 ctx->signer_cert = signer;
168 X509_up_ref(ctx->signer_cert);
169 return 1;
170 }
171
TS_RESP_CTX_set_signer_key(TS_RESP_CTX * ctx,EVP_PKEY * key)172 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
173 {
174 EVP_PKEY_free(ctx->signer_key);
175 ctx->signer_key = key;
176 EVP_PKEY_up_ref(ctx->signer_key);
177
178 return 1;
179 }
180
TS_RESP_CTX_set_signer_digest(TS_RESP_CTX * ctx,const EVP_MD * md)181 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
182 {
183 ctx->signer_md = md;
184 return 1;
185 }
186
TS_RESP_CTX_set_def_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * def_policy)187 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
188 {
189 ASN1_OBJECT_free(ctx->default_policy);
190 if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
191 goto err;
192 return 1;
193 err:
194 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
195 return 0;
196 }
197
TS_RESP_CTX_set_certs(TS_RESP_CTX * ctx,STACK_OF (X509)* certs)198 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
199 {
200 sk_X509_pop_free(ctx->certs, X509_free);
201 ctx->certs = NULL;
202
203 return certs == NULL || (ctx->certs = X509_chain_up_ref(certs)) != NULL;
204 }
205
TS_RESP_CTX_add_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * policy)206 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
207 {
208 ASN1_OBJECT *copy = NULL;
209
210 if (ctx->policies == NULL
211 && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL)
212 goto err;
213 if ((copy = OBJ_dup(policy)) == NULL)
214 goto err;
215 if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
216 goto err;
217
218 return 1;
219 err:
220 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
221 ASN1_OBJECT_free(copy);
222 return 0;
223 }
224
TS_RESP_CTX_add_md(TS_RESP_CTX * ctx,const EVP_MD * md)225 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
226 {
227 if (ctx->mds == NULL
228 && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
229 goto err;
230 if (!sk_EVP_MD_push(ctx->mds, md))
231 goto err;
232
233 return 1;
234 err:
235 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
236 return 0;
237 }
238
239 #define TS_RESP_CTX_accuracy_free(ctx) \
240 ASN1_INTEGER_free(ctx->seconds); \
241 ctx->seconds = NULL; \
242 ASN1_INTEGER_free(ctx->millis); \
243 ctx->millis = NULL; \
244 ASN1_INTEGER_free(ctx->micros); \
245 ctx->micros = NULL;
246
TS_RESP_CTX_set_accuracy(TS_RESP_CTX * ctx,int secs,int millis,int micros)247 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
248 int secs, int millis, int micros)
249 {
250
251 TS_RESP_CTX_accuracy_free(ctx);
252 if (secs
253 && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
254 || !ASN1_INTEGER_set(ctx->seconds, secs)))
255 goto err;
256 if (millis
257 && ((ctx->millis = ASN1_INTEGER_new()) == NULL
258 || !ASN1_INTEGER_set(ctx->millis, millis)))
259 goto err;
260 if (micros
261 && ((ctx->micros = ASN1_INTEGER_new()) == NULL
262 || !ASN1_INTEGER_set(ctx->micros, micros)))
263 goto err;
264
265 return 1;
266 err:
267 TS_RESP_CTX_accuracy_free(ctx);
268 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
269 return 0;
270 }
271
TS_RESP_CTX_add_flags(TS_RESP_CTX * ctx,int flags)272 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
273 {
274 ctx->flags |= flags;
275 }
276
TS_RESP_CTX_set_serial_cb(TS_RESP_CTX * ctx,TS_serial_cb cb,void * data)277 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
278 {
279 ctx->serial_cb = cb;
280 ctx->serial_cb_data = data;
281 }
282
TS_RESP_CTX_set_time_cb(TS_RESP_CTX * ctx,TS_time_cb cb,void * data)283 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
284 {
285 ctx->time_cb = cb;
286 ctx->time_cb_data = data;
287 }
288
TS_RESP_CTX_set_extension_cb(TS_RESP_CTX * ctx,TS_extension_cb cb,void * data)289 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
290 TS_extension_cb cb, void *data)
291 {
292 ctx->extension_cb = cb;
293 ctx->extension_cb_data = data;
294 }
295
TS_RESP_CTX_set_status_info(TS_RESP_CTX * ctx,int status,const char * text)296 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
297 int status, const char *text)
298 {
299 TS_STATUS_INFO *si = NULL;
300 ASN1_UTF8STRING *utf8_text = NULL;
301 int ret = 0;
302
303 if ((si = TS_STATUS_INFO_new()) == NULL)
304 goto err;
305 if (!ASN1_INTEGER_set(si->status, status))
306 goto err;
307 if (text) {
308 if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
309 || !ASN1_STRING_set(utf8_text, text, strlen(text)))
310 goto err;
311 if (si->text == NULL
312 && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL)
313 goto err;
314 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
315 goto err;
316 utf8_text = NULL; /* Ownership is lost. */
317 }
318 if (!TS_RESP_set_status_info(ctx->response, si))
319 goto err;
320 ret = 1;
321 err:
322 if (!ret)
323 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
324 TS_STATUS_INFO_free(si);
325 ASN1_UTF8STRING_free(utf8_text);
326 return ret;
327 }
328
TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX * ctx,int status,const char * text)329 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
330 int status, const char *text)
331 {
332 int ret = 1;
333 TS_STATUS_INFO *si = ctx->response->status_info;
334
335 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
336 ret = TS_RESP_CTX_set_status_info(ctx, status, text);
337 }
338 return ret;
339 }
340
TS_RESP_CTX_add_failure_info(TS_RESP_CTX * ctx,int failure)341 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
342 {
343 TS_STATUS_INFO *si = ctx->response->status_info;
344 if (si->failure_info == NULL
345 && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
346 goto err;
347 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
348 goto err;
349 return 1;
350 err:
351 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
352 return 0;
353 }
354
TS_RESP_CTX_get_request(TS_RESP_CTX * ctx)355 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
356 {
357 return ctx->request;
358 }
359
TS_RESP_CTX_get_tst_info(TS_RESP_CTX * ctx)360 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
361 {
362 return ctx->tst_info;
363 }
364
TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX * ctx,unsigned precision)365 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
366 unsigned precision)
367 {
368 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
369 return 0;
370 ctx->clock_precision_digits = precision;
371 return 1;
372 }
373
374 /* Main entry method of the response generation. */
TS_RESP_create_response(TS_RESP_CTX * ctx,BIO * req_bio)375 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
376 {
377 ASN1_OBJECT *policy;
378 TS_RESP *response;
379 int result = 0;
380
381 ts_RESP_CTX_init(ctx);
382
383 if ((ctx->response = TS_RESP_new()) == NULL) {
384 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
385 goto end;
386 }
387 if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
388 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
389 "Bad request format or system error.");
390 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
391 goto end;
392 }
393 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
394 goto end;
395 if (!ts_RESP_check_request(ctx))
396 goto end;
397 if ((policy = ts_RESP_get_policy(ctx)) == NULL)
398 goto end;
399 if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
400 goto end;
401 if (!ts_RESP_process_extensions(ctx))
402 goto end;
403 if (!ts_RESP_sign(ctx))
404 goto end;
405 result = 1;
406
407 end:
408 if (!result) {
409 ERR_raise(ERR_LIB_TS, TS_R_RESPONSE_SETUP_ERROR);
410 if (ctx->response != NULL) {
411 if (TS_RESP_CTX_set_status_info_cond(ctx,
412 TS_STATUS_REJECTION,
413 "Error during response "
414 "generation.") == 0) {
415 TS_RESP_free(ctx->response);
416 ctx->response = NULL;
417 }
418 }
419 }
420 response = ctx->response;
421 ctx->response = NULL; /* Ownership will be returned to caller. */
422 ts_RESP_CTX_cleanup(ctx);
423 return response;
424 }
425
426 /* Initializes the variable part of the context. */
ts_RESP_CTX_init(TS_RESP_CTX * ctx)427 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
428 {
429 ctx->request = NULL;
430 ctx->response = NULL;
431 ctx->tst_info = NULL;
432 }
433
434 /* Cleans up the variable part of the context. */
ts_RESP_CTX_cleanup(TS_RESP_CTX * ctx)435 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
436 {
437 TS_REQ_free(ctx->request);
438 ctx->request = NULL;
439 TS_RESP_free(ctx->response);
440 ctx->response = NULL;
441 TS_TST_INFO_free(ctx->tst_info);
442 ctx->tst_info = NULL;
443 }
444
445 /* Checks the format and content of the request. */
ts_RESP_check_request(TS_RESP_CTX * ctx)446 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
447 {
448 TS_REQ *request = ctx->request;
449 TS_MSG_IMPRINT *msg_imprint;
450 X509_ALGOR *md_alg;
451 char md_alg_name[OSSL_MAX_NAME_SIZE];
452 const ASN1_OCTET_STRING *digest;
453 const EVP_MD *md = NULL;
454 int i;
455
456 if (TS_REQ_get_version(request) != 1) {
457 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
458 "Bad request version.");
459 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
460 return 0;
461 }
462
463 msg_imprint = request->msg_imprint;
464 md_alg = msg_imprint->hash_algo;
465 OBJ_obj2txt(md_alg_name, sizeof(md_alg_name), md_alg->algorithm, 0);
466 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
467 const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
468 if (EVP_MD_is_a(current_md, md_alg_name))
469 md = current_md;
470 }
471 if (!md) {
472 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
473 "Message digest algorithm is "
474 "not supported.");
475 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
476 return 0;
477 }
478
479 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
480 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
481 "Superfluous message digest "
482 "parameter.");
483 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
484 return 0;
485 }
486 digest = msg_imprint->hashed_msg;
487 if (digest->length != EVP_MD_get_size(md)) {
488 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
489 "Bad message digest.");
490 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
491 return 0;
492 }
493
494 return 1;
495 }
496
497 /* Returns the TSA policy based on the requested and acceptable policies. */
ts_RESP_get_policy(TS_RESP_CTX * ctx)498 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
499 {
500 ASN1_OBJECT *requested = ctx->request->policy_id;
501 ASN1_OBJECT *policy = NULL;
502 int i;
503
504 if (ctx->default_policy == NULL) {
505 ERR_raise(ERR_LIB_TS, TS_R_INVALID_NULL_POINTER);
506 return NULL;
507 }
508 if (!requested || !OBJ_cmp(requested, ctx->default_policy))
509 policy = ctx->default_policy;
510
511 /* Check if the policy is acceptable. */
512 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
513 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
514 if (!OBJ_cmp(requested, current))
515 policy = current;
516 }
517 if (policy == NULL) {
518 ERR_raise(ERR_LIB_TS, TS_R_UNACCEPTABLE_POLICY);
519 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
520 "Requested policy is not " "supported.");
521 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
522 }
523 return policy;
524 }
525
526 /* 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)527 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
528 ASN1_OBJECT *policy)
529 {
530 int result = 0;
531 TS_TST_INFO *tst_info = NULL;
532 ASN1_INTEGER *serial = NULL;
533 ASN1_GENERALIZEDTIME *asn1_time = NULL;
534 long sec, usec;
535 TS_ACCURACY *accuracy = NULL;
536 const ASN1_INTEGER *nonce;
537 GENERAL_NAME *tsa_name = NULL;
538
539 if ((tst_info = TS_TST_INFO_new()) == NULL)
540 goto end;
541 if (!TS_TST_INFO_set_version(tst_info, 1))
542 goto end;
543 if (!TS_TST_INFO_set_policy_id(tst_info, policy))
544 goto end;
545 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
546 goto end;
547 if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
548 || !TS_TST_INFO_set_serial(tst_info, serial))
549 goto end;
550 if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
551 || (asn1_time =
552 TS_RESP_set_genTime_with_precision(NULL, sec, usec,
553 ctx->clock_precision_digits)) == NULL
554 || !TS_TST_INFO_set_time(tst_info, asn1_time))
555 goto end;
556
557 if ((ctx->seconds || ctx->millis || ctx->micros)
558 && (accuracy = TS_ACCURACY_new()) == NULL)
559 goto end;
560 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
561 goto end;
562 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
563 goto end;
564 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
565 goto end;
566 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
567 goto end;
568
569 if ((ctx->flags & TS_ORDERING)
570 && !TS_TST_INFO_set_ordering(tst_info, 1))
571 goto end;
572
573 if ((nonce = ctx->request->nonce) != NULL
574 && !TS_TST_INFO_set_nonce(tst_info, nonce))
575 goto end;
576
577 if (ctx->flags & TS_TSA_NAME) {
578 if ((tsa_name = GENERAL_NAME_new()) == NULL)
579 goto end;
580 tsa_name->type = GEN_DIRNAME;
581 tsa_name->d.dirn =
582 X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
583 if (!tsa_name->d.dirn)
584 goto end;
585 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
586 goto end;
587 }
588
589 result = 1;
590 end:
591 if (!result) {
592 TS_TST_INFO_free(tst_info);
593 tst_info = NULL;
594 ERR_raise(ERR_LIB_TS, TS_R_TST_INFO_SETUP_ERROR);
595 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
596 "Error during TSTInfo "
597 "generation.");
598 }
599 GENERAL_NAME_free(tsa_name);
600 TS_ACCURACY_free(accuracy);
601 ASN1_GENERALIZEDTIME_free(asn1_time);
602 ASN1_INTEGER_free(serial);
603
604 return tst_info;
605 }
606
607 /* Processing the extensions of the request. */
ts_RESP_process_extensions(TS_RESP_CTX * ctx)608 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
609 {
610 STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
611 int i;
612 int ok = 1;
613
614 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
615 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
616 /*
617 * The last argument was previously (void *)ctx->extension_cb,
618 * but ISO C doesn't permit converting a function pointer to void *.
619 * For lack of better information, I'm placing a NULL there instead.
620 * The callback can pick its own address out from the ctx anyway...
621 */
622 ok = (*ctx->extension_cb) (ctx, ext, NULL);
623 }
624
625 return ok;
626 }
627
628 /* 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)629 static int ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO *si,
630 const ESS_SIGNING_CERT *sc)
631 {
632 ASN1_STRING *seq = NULL;
633 int len = i2d_ESS_SIGNING_CERT(sc, NULL);
634 unsigned char *p, *pp = OPENSSL_malloc(len);
635
636 if (pp == NULL)
637 return 0;
638
639 p = pp;
640 i2d_ESS_SIGNING_CERT(sc, &p);
641 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
642 ASN1_STRING_free(seq);
643 OPENSSL_free(pp);
644 return 0;
645 }
646
647 OPENSSL_free(pp);
648 if (!PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificate,
649 V_ASN1_SEQUENCE, seq)) {
650 ASN1_STRING_free(seq);
651 return 0;
652 }
653 return 1;
654 }
655
ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO * si,const ESS_SIGNING_CERT_V2 * sc)656 static int ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO *si,
657 const ESS_SIGNING_CERT_V2 *sc)
658 {
659 ASN1_STRING *seq = NULL;
660 int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
661 unsigned char *p, *pp = OPENSSL_malloc(len);
662
663 if (pp == NULL)
664 return 0;
665
666 p = pp;
667 i2d_ESS_SIGNING_CERT_V2(sc, &p);
668 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
669 ASN1_STRING_free(seq);
670 OPENSSL_free(pp);
671 return 0;
672 }
673
674 OPENSSL_free(pp);
675 if (!PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificateV2,
676 V_ASN1_SEQUENCE, seq)) {
677 ASN1_STRING_free(seq);
678 return 0;
679 }
680 return 1;
681 }
682
ts_RESP_sign(TS_RESP_CTX * ctx)683 static int ts_RESP_sign(TS_RESP_CTX *ctx)
684 {
685 int ret = 0;
686 PKCS7 *p7 = NULL;
687 PKCS7_SIGNER_INFO *si;
688 STACK_OF(X509) *certs; /* Certificates to include in sc. */
689 ESS_SIGNING_CERT_V2 *sc2 = NULL;
690 ESS_SIGNING_CERT *sc = NULL;
691 ASN1_OBJECT *oid;
692 BIO *p7bio = NULL;
693 int i;
694 EVP_MD *signer_md = NULL;
695
696 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
697 ERR_raise(ERR_LIB_TS, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
698 goto err;
699 }
700
701 if ((p7 = PKCS7_new_ex(ctx->libctx, ctx->propq)) == NULL) {
702 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
703 goto err;
704 }
705 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
706 goto err;
707 if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
708 goto err;
709
710 if (ctx->request->cert_req) {
711 PKCS7_add_certificate(p7, ctx->signer_cert);
712 if (ctx->certs) {
713 for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
714 X509 *cert = sk_X509_value(ctx->certs, i);
715 PKCS7_add_certificate(p7, cert);
716 }
717 }
718 }
719
720 if (ctx->signer_md == NULL)
721 signer_md = EVP_MD_fetch(ctx->libctx, "SHA256", ctx->propq);
722 else if (EVP_MD_get0_provider(ctx->signer_md) == NULL)
723 signer_md = EVP_MD_fetch(ctx->libctx, EVP_MD_get0_name(ctx->signer_md),
724 ctx->propq);
725 else
726 signer_md = (EVP_MD *)ctx->signer_md;
727
728 if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
729 ctx->signer_key, signer_md)) == NULL) {
730 ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
731 goto err;
732 }
733
734 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
735 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
736 V_ASN1_OBJECT, oid)) {
737 ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
738 goto err;
739 }
740
741 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
742 if (ctx->ess_cert_id_digest == NULL
743 || EVP_MD_is_a(ctx->ess_cert_id_digest, SN_sha1)) {
744 if ((sc = OSSL_ESS_signing_cert_new_init(ctx->signer_cert,
745 certs, 0)) == NULL)
746 goto err;
747
748 if (!ossl_ess_add1_signing_cert(si, sc)) {
749 ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
750 goto err;
751 }
752 } else {
753 sc2 = OSSL_ESS_signing_cert_v2_new_init(ctx->ess_cert_id_digest,
754 ctx->signer_cert, certs, 0);
755 if (sc2 == NULL)
756 goto err;
757
758 if (!ossl_ess_add1_signing_cert_v2(si, sc2)) {
759 ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR);
760 goto err;
761 }
762 }
763
764 if (!ts_TST_INFO_content_new(p7))
765 goto err;
766 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
767 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
768 goto err;
769 }
770 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
771 ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
772 goto err;
773 }
774 if (!PKCS7_dataFinal(p7, p7bio)) {
775 ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
776 goto err;
777 }
778 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
779 p7 = NULL; /* Ownership is lost. */
780 ctx->tst_info = NULL; /* Ownership is lost. */
781
782 ret = 1;
783 err:
784 if (signer_md != ctx->signer_md)
785 EVP_MD_free(signer_md);
786
787 if (!ret)
788 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
789 "Error during signature "
790 "generation.");
791 BIO_free_all(p7bio);
792 ESS_SIGNING_CERT_V2_free(sc2);
793 ESS_SIGNING_CERT_free(sc);
794 PKCS7_free(p7);
795 return ret;
796 }
797
ts_TST_INFO_content_new(PKCS7 * p7)798 static int ts_TST_INFO_content_new(PKCS7 *p7)
799 {
800 PKCS7 *ret = NULL;
801 ASN1_OCTET_STRING *octet_string = NULL;
802
803 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
804 if ((ret = PKCS7_new()) == NULL)
805 goto err;
806 if ((ret->d.other = ASN1_TYPE_new()) == NULL)
807 goto err;
808 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
809 if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
810 goto err;
811 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
812 octet_string = NULL;
813
814 /* Add encapsulated content to signed PKCS7 structure. */
815 if (!PKCS7_set_content(p7, ret))
816 goto err;
817
818 return 1;
819 err:
820 ASN1_OCTET_STRING_free(octet_string);
821 PKCS7_free(ret);
822 return 0;
823 }
824
TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME * asn1_time,long sec,long usec,unsigned precision)825 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
826 ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec,
827 unsigned precision)
828 {
829 time_t time_sec = (time_t)sec;
830 struct tm *tm = NULL, tm_result;
831 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
832 char *p = genTime_str;
833 char *p_end = genTime_str + sizeof(genTime_str);
834
835 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
836 goto err;
837
838 if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL)
839 goto err;
840
841 /*
842 * Put "genTime_str" in GeneralizedTime format. We work around the
843 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
844 * NOT include fractional seconds") and OpenSSL related functions to
845 * meet the rfc3161 requirement: "GeneralizedTime syntax can include
846 * fraction-of-second details".
847 */
848 p += BIO_snprintf(p, p_end - p,
849 "%04d%02d%02d%02d%02d%02d",
850 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
851 tm->tm_hour, tm->tm_min, tm->tm_sec);
852 if (precision > 0) {
853 BIO_snprintf(p, 2 + precision, ".%06ld", usec);
854 p += strlen(p);
855
856 /*
857 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
858 * following restrictions for a DER-encoding, which OpenSSL
859 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
860 * support: "The encoding MUST terminate with a "Z" (which means
861 * "Zulu" time). The decimal point element, if present, MUST be the
862 * point option ".". The fractional-seconds elements, if present,
863 * MUST omit all trailing 0's; if the elements correspond to 0, they
864 * MUST be wholly omitted, and the decimal point element also MUST be
865 * omitted."
866 */
867 /*
868 * Remove trailing zeros. The dot guarantees the exit condition of
869 * this loop even if all the digits are zero.
870 */
871 while (*--p == '0')
872 continue;
873 if (*p != '.')
874 ++p;
875 }
876 *p++ = 'Z';
877 *p++ = '\0';
878
879 if (asn1_time == NULL
880 && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
881 goto err;
882 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
883 ASN1_GENERALIZEDTIME_free(asn1_time);
884 goto err;
885 }
886 return asn1_time;
887
888 err:
889 ERR_raise(ERR_LIB_TS, TS_R_COULD_NOT_SET_TIME);
890 return NULL;
891 }
892
TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX * ctx,const EVP_MD * md)893 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
894 {
895 ctx->ess_cert_id_digest = md;
896 return 1;
897 }
898