1 /* $OpenBSD: ts_rsp_sign.c,v 1.29 2022/07/24 20:02:04 tb Exp $ */
2 /* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
3 * project 2002.
4 */
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59 #include <sys/time.h>
60
61 #include <string.h>
62
63 #include <openssl/err.h>
64 #include <openssl/objects.h>
65 #include <openssl/pkcs7.h>
66 #include <openssl/ts.h>
67
68 #include "evp_locl.h"
69 #include "ts_local.h"
70 #include "x509_lcl.h"
71
72 /* Private function declarations. */
73
74 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
75 static int def_time_cb(struct TS_resp_ctx *, void *, time_t *sec, long *usec);
76 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
77
78 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
79 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
80 static int TS_RESP_check_request(TS_RESP_CTX *ctx);
81 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
82 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
83 ASN1_OBJECT *policy);
84 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
85 static int TS_RESP_sign(TS_RESP_CTX *ctx);
86
87 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
88 STACK_OF(X509) *certs);
89 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
90 static int TS_TST_INFO_content_new(PKCS7 *p7);
91 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
92
93 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
94 ASN1_GENERALIZEDTIME *, time_t, long, unsigned);
95
96 /* Default callbacks for response generation. */
97
98 static ASN1_INTEGER *
def_serial_cb(struct TS_resp_ctx * ctx,void * data)99 def_serial_cb(struct TS_resp_ctx *ctx, void *data)
100 {
101 ASN1_INTEGER *serial = ASN1_INTEGER_new();
102
103 if (!serial)
104 goto err;
105 if (!ASN1_INTEGER_set(serial, 1))
106 goto err;
107 return serial;
108
109 err:
110 TSerror(ERR_R_MALLOC_FAILURE);
111 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
112 "Error during serial number generation.");
113 return NULL;
114 }
115
116 /* Use the gettimeofday function call. */
117 static int
def_time_cb(struct TS_resp_ctx * ctx,void * data,time_t * sec,long * usec)118 def_time_cb(struct TS_resp_ctx *ctx, void *data, time_t *sec, long *usec)
119 {
120 struct timeval tv;
121
122 if (gettimeofday(&tv, NULL) != 0) {
123 TSerror(TS_R_TIME_SYSCALL_ERROR);
124 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
125 "Time is not available.");
126 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
127 return 0;
128 }
129 /* Return time to caller. */
130 *sec = tv.tv_sec;
131 *usec = tv.tv_usec;
132
133 return 1;
134 }
135
136 static int
def_extension_cb(struct TS_resp_ctx * ctx,X509_EXTENSION * ext,void * data)137 def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, void *data)
138 {
139 /* No extensions are processed here. */
140 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
141 "Unsupported extension.");
142 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
143 return 0;
144 }
145
146 void
TS_RESP_CTX_set_time_cb(TS_RESP_CTX * ctx,TS_time_cb cb,void * data)147 TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
148 {
149 ctx->time_cb = cb;
150 ctx->time_cb_data = data;
151 }
152
153 /* TS_RESP_CTX management functions. */
154
155 TS_RESP_CTX *
TS_RESP_CTX_new(void)156 TS_RESP_CTX_new(void)
157 {
158 TS_RESP_CTX *ctx;
159
160 if (!(ctx = calloc(1, sizeof(TS_RESP_CTX)))) {
161 TSerror(ERR_R_MALLOC_FAILURE);
162 return NULL;
163 }
164
165 /* Setting default callbacks. */
166 ctx->serial_cb = def_serial_cb;
167 ctx->time_cb = def_time_cb;
168 ctx->extension_cb = def_extension_cb;
169
170 return ctx;
171 }
172
173 void
TS_RESP_CTX_free(TS_RESP_CTX * ctx)174 TS_RESP_CTX_free(TS_RESP_CTX *ctx)
175 {
176 if (!ctx)
177 return;
178
179 X509_free(ctx->signer_cert);
180 EVP_PKEY_free(ctx->signer_key);
181 sk_X509_pop_free(ctx->certs, X509_free);
182 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
183 ASN1_OBJECT_free(ctx->default_policy);
184 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */
185 ASN1_INTEGER_free(ctx->seconds);
186 ASN1_INTEGER_free(ctx->millis);
187 ASN1_INTEGER_free(ctx->micros);
188 free(ctx);
189 }
190
191 int
TS_RESP_CTX_set_signer_cert(TS_RESP_CTX * ctx,X509 * signer)192 TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
193 {
194 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
195 TSerror(TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
196 return 0;
197 }
198 X509_free(ctx->signer_cert);
199 ctx->signer_cert = signer;
200 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
201 return 1;
202 }
203
204 int
TS_RESP_CTX_set_signer_key(TS_RESP_CTX * ctx,EVP_PKEY * key)205 TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
206 {
207 EVP_PKEY_free(ctx->signer_key);
208 ctx->signer_key = key;
209 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
210
211 return 1;
212 }
213
214 int
TS_RESP_CTX_set_def_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * def_policy)215 TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
216 {
217 if (ctx->default_policy)
218 ASN1_OBJECT_free(ctx->default_policy);
219 if (!(ctx->default_policy = OBJ_dup(def_policy)))
220 goto err;
221 return 1;
222
223 err:
224 TSerror(ERR_R_MALLOC_FAILURE);
225 return 0;
226 }
227
228 int
TS_RESP_CTX_set_certs(TS_RESP_CTX * ctx,STACK_OF (X509)* certs)229 TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
230 {
231 int i;
232
233 if (ctx->certs) {
234 sk_X509_pop_free(ctx->certs, X509_free);
235 ctx->certs = NULL;
236 }
237 if (!certs)
238 return 1;
239 if (!(ctx->certs = sk_X509_dup(certs))) {
240 TSerror(ERR_R_MALLOC_FAILURE);
241 return 0;
242 }
243 for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
244 X509 *cert = sk_X509_value(ctx->certs, i);
245 CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509);
246 }
247
248 return 1;
249 }
250
251 int
TS_RESP_CTX_add_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * policy)252 TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
253 {
254 ASN1_OBJECT *copy = NULL;
255
256 /* Create new policy stack if necessary. */
257 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null()))
258 goto err;
259 if (!(copy = OBJ_dup(policy)))
260 goto err;
261 if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
262 goto err;
263
264 return 1;
265
266 err:
267 TSerror(ERR_R_MALLOC_FAILURE);
268 ASN1_OBJECT_free(copy);
269 return 0;
270 }
271
272 int
TS_RESP_CTX_add_md(TS_RESP_CTX * ctx,const EVP_MD * md)273 TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
274 {
275 /* Create new md stack if necessary. */
276 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null()))
277 goto err;
278 /* Add the shared md, no copy needed. */
279 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md))
280 goto err;
281
282 return 1;
283
284 err:
285 TSerror(ERR_R_MALLOC_FAILURE);
286 return 0;
287 }
288
289 #define TS_RESP_CTX_accuracy_free(ctx) \
290 ASN1_INTEGER_free(ctx->seconds); \
291 ctx->seconds = NULL; \
292 ASN1_INTEGER_free(ctx->millis); \
293 ctx->millis = NULL; \
294 ASN1_INTEGER_free(ctx->micros); \
295 ctx->micros = NULL;
296
297 int
TS_RESP_CTX_set_accuracy(TS_RESP_CTX * ctx,int secs,int millis,int micros)298 TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, int secs, int millis, int micros)
299 {
300 TS_RESP_CTX_accuracy_free(ctx);
301 if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) ||
302 !ASN1_INTEGER_set(ctx->seconds, secs)))
303 goto err;
304 if (millis && (!(ctx->millis = ASN1_INTEGER_new()) ||
305 !ASN1_INTEGER_set(ctx->millis, millis)))
306 goto err;
307 if (micros && (!(ctx->micros = ASN1_INTEGER_new()) ||
308 !ASN1_INTEGER_set(ctx->micros, micros)))
309 goto err;
310
311 return 1;
312
313 err:
314 TS_RESP_CTX_accuracy_free(ctx);
315 TSerror(ERR_R_MALLOC_FAILURE);
316 return 0;
317 }
318
319 void
TS_RESP_CTX_add_flags(TS_RESP_CTX * ctx,int flags)320 TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
321 {
322 ctx->flags |= flags;
323 }
324
325 void
TS_RESP_CTX_set_serial_cb(TS_RESP_CTX * ctx,TS_serial_cb cb,void * data)326 TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
327 {
328 ctx->serial_cb = cb;
329 ctx->serial_cb_data = data;
330 }
331
332 void
TS_RESP_CTX_set_extension_cb(TS_RESP_CTX * ctx,TS_extension_cb cb,void * data)333 TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, TS_extension_cb cb, void *data)
334 {
335 ctx->extension_cb = cb;
336 ctx->extension_cb_data = data;
337 }
338
339 int
TS_RESP_CTX_set_status_info(TS_RESP_CTX * ctx,int status,const char * text)340 TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, int status, const char *text)
341 {
342 TS_STATUS_INFO *si = NULL;
343 ASN1_UTF8STRING *utf8_text = NULL;
344 int ret = 0;
345
346 if (!(si = TS_STATUS_INFO_new()))
347 goto err;
348 if (!ASN1_INTEGER_set(si->status, status))
349 goto err;
350 if (text) {
351 if (!(utf8_text = ASN1_UTF8STRING_new()) ||
352 !ASN1_STRING_set(utf8_text, text, strlen(text)))
353 goto err;
354 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
355 goto err;
356 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
357 goto err;
358 utf8_text = NULL; /* Ownership is lost. */
359 }
360 if (!TS_RESP_set_status_info(ctx->response, si))
361 goto err;
362 ret = 1;
363
364 err:
365 if (!ret)
366 TSerror(ERR_R_MALLOC_FAILURE);
367 TS_STATUS_INFO_free(si);
368 ASN1_UTF8STRING_free(utf8_text);
369 return ret;
370 }
371
372 int
TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX * ctx,int status,const char * text)373 TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, int status, const char *text)
374 {
375 int ret = 1;
376 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
377
378 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
379 /* Status has not been set, set it now. */
380 ret = TS_RESP_CTX_set_status_info(ctx, status, text);
381 }
382 return ret;
383 }
384
385 int
TS_RESP_CTX_add_failure_info(TS_RESP_CTX * ctx,int failure)386 TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
387 {
388 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
389
390 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
391 goto err;
392 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
393 goto err;
394 return 1;
395
396 err:
397 TSerror(ERR_R_MALLOC_FAILURE);
398 return 0;
399 }
400
401 TS_REQ *
TS_RESP_CTX_get_request(TS_RESP_CTX * ctx)402 TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
403 {
404 return ctx->request;
405 }
406
407 TS_TST_INFO *
TS_RESP_CTX_get_tst_info(TS_RESP_CTX * ctx)408 TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
409 {
410 return ctx->tst_info;
411 }
412
413 int
TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX * ctx,unsigned precision)414 TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision)
415 {
416 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
417 return 0;
418 ctx->clock_precision_digits = precision;
419 return 1;
420 }
421
422 /* Main entry method of the response generation. */
423 TS_RESP *
TS_RESP_create_response(TS_RESP_CTX * ctx,BIO * req_bio)424 TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
425 {
426 ASN1_OBJECT *policy;
427 TS_RESP *response;
428 int result = 0;
429
430 TS_RESP_CTX_init(ctx);
431
432 /* Creating the response object. */
433 if (!(ctx->response = TS_RESP_new())) {
434 TSerror(ERR_R_MALLOC_FAILURE);
435 goto end;
436 }
437
438 /* Parsing DER request. */
439 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) {
440 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
441 "Bad request format or "
442 "system error.");
443 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
444 goto end;
445 }
446
447 /* Setting default status info. */
448 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
449 goto end;
450
451 /* Checking the request format. */
452 if (!TS_RESP_check_request(ctx))
453 goto end;
454
455 /* Checking acceptable policies. */
456 if (!(policy = TS_RESP_get_policy(ctx)))
457 goto end;
458
459 /* Creating the TS_TST_INFO object. */
460 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
461 goto end;
462
463 /* Processing extensions. */
464 if (!TS_RESP_process_extensions(ctx))
465 goto end;
466
467 /* Generating the signature. */
468 if (!TS_RESP_sign(ctx))
469 goto end;
470
471 /* Everything was successful. */
472 result = 1;
473
474 end:
475 if (!result) {
476 TSerror(TS_R_RESPONSE_SETUP_ERROR);
477 if (ctx->response != NULL) {
478 if (TS_RESP_CTX_set_status_info_cond(ctx,
479 TS_STATUS_REJECTION, "Error during response "
480 "generation.") == 0) {
481 TS_RESP_free(ctx->response);
482 ctx->response = NULL;
483 }
484 }
485 }
486 response = ctx->response;
487 ctx->response = NULL; /* Ownership will be returned to caller. */
488 TS_RESP_CTX_cleanup(ctx);
489 return response;
490 }
491
492 /* Initializes the variable part of the context. */
493 static void
TS_RESP_CTX_init(TS_RESP_CTX * ctx)494 TS_RESP_CTX_init(TS_RESP_CTX *ctx)
495 {
496 ctx->request = NULL;
497 ctx->response = NULL;
498 ctx->tst_info = NULL;
499 }
500
501 /* Cleans up the variable part of the context. */
502 static void
TS_RESP_CTX_cleanup(TS_RESP_CTX * ctx)503 TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
504 {
505 TS_REQ_free(ctx->request);
506 ctx->request = NULL;
507 TS_RESP_free(ctx->response);
508 ctx->response = NULL;
509 TS_TST_INFO_free(ctx->tst_info);
510 ctx->tst_info = NULL;
511 }
512
513 /* Checks the format and content of the request. */
514 static int
TS_RESP_check_request(TS_RESP_CTX * ctx)515 TS_RESP_check_request(TS_RESP_CTX *ctx)
516 {
517 TS_REQ *request = ctx->request;
518 TS_MSG_IMPRINT *msg_imprint;
519 X509_ALGOR *md_alg;
520 int md_alg_id;
521 const ASN1_OCTET_STRING *digest;
522 EVP_MD *md = NULL;
523 int i;
524
525 /* Checking request version. */
526 if (TS_REQ_get_version(request) != 1) {
527 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
528 "Bad request version.");
529 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
530 return 0;
531 }
532
533 /* Checking message digest algorithm. */
534 msg_imprint = TS_REQ_get_msg_imprint(request);
535 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
536 md_alg_id = OBJ_obj2nid(md_alg->algorithm);
537 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
538 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
539 if (md_alg_id == EVP_MD_type(current_md))
540 md = current_md;
541 }
542 if (!md) {
543 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
544 "Message digest algorithm is "
545 "not supported.");
546 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
547 return 0;
548 }
549
550 /* No message digest takes parameter. */
551 if (md_alg->parameter &&
552 ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
553 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
554 "Superfluous message digest "
555 "parameter.");
556 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
557 return 0;
558 }
559 /* Checking message digest size. */
560 digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
561 if (digest->length != EVP_MD_size(md)) {
562 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
563 "Bad message digest.");
564 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
565 return 0;
566 }
567
568 return 1;
569 }
570
571 /* Returns the TSA policy based on the requested and acceptable policies. */
572 static ASN1_OBJECT *
TS_RESP_get_policy(TS_RESP_CTX * ctx)573 TS_RESP_get_policy(TS_RESP_CTX *ctx)
574 {
575 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
576 ASN1_OBJECT *policy = NULL;
577 int i;
578
579 if (ctx->default_policy == NULL) {
580 TSerror(TS_R_INVALID_NULL_POINTER);
581 return NULL;
582 }
583 /* Return the default policy if none is requested or the default is
584 requested. */
585 if (!requested || !OBJ_cmp(requested, ctx->default_policy))
586 policy = ctx->default_policy;
587
588 /* Check if the policy is acceptable. */
589 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
590 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
591 if (!OBJ_cmp(requested, current))
592 policy = current;
593 }
594 if (!policy) {
595 TSerror(TS_R_UNACCEPTABLE_POLICY);
596 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
597 "Requested policy is not "
598 "supported.");
599 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
600 }
601 return policy;
602 }
603
604 /* Creates the TS_TST_INFO object based on the settings of the context. */
605 static TS_TST_INFO *
TS_RESP_create_tst_info(TS_RESP_CTX * ctx,ASN1_OBJECT * policy)606 TS_RESP_create_tst_info(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
607 {
608 int result = 0;
609 TS_TST_INFO *tst_info = NULL;
610 ASN1_INTEGER *serial = NULL;
611 ASN1_GENERALIZEDTIME *asn1_time = NULL;
612 time_t sec;
613 long usec;
614 TS_ACCURACY *accuracy = NULL;
615 const ASN1_INTEGER *nonce;
616 GENERAL_NAME *tsa_name = NULL;
617
618 if (!(tst_info = TS_TST_INFO_new()))
619 goto end;
620 if (!TS_TST_INFO_set_version(tst_info, 1))
621 goto end;
622 if (!TS_TST_INFO_set_policy_id(tst_info, policy))
623 goto end;
624 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
625 goto end;
626 if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data)) ||
627 !TS_TST_INFO_set_serial(tst_info, serial))
628 goto end;
629 if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec) ||
630 !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, sec, usec,
631 ctx->clock_precision_digits)) ||
632 !TS_TST_INFO_set_time(tst_info, asn1_time))
633 goto end;
634
635 /* Setting accuracy if needed. */
636 if ((ctx->seconds || ctx->millis || ctx->micros) &&
637 !(accuracy = TS_ACCURACY_new()))
638 goto end;
639
640 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
641 goto end;
642 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
643 goto end;
644 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
645 goto end;
646 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
647 goto end;
648
649 /* Setting ordering. */
650 if ((ctx->flags & TS_ORDERING) &&
651 !TS_TST_INFO_set_ordering(tst_info, 1))
652 goto end;
653
654 /* Setting nonce if needed. */
655 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL &&
656 !TS_TST_INFO_set_nonce(tst_info, nonce))
657 goto end;
658
659 /* Setting TSA name to subject of signer certificate. */
660 if (ctx->flags & TS_TSA_NAME) {
661 if (!(tsa_name = GENERAL_NAME_new()))
662 goto end;
663 tsa_name->type = GEN_DIRNAME;
664 tsa_name->d.dirn =
665 X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
666 if (!tsa_name->d.dirn)
667 goto end;
668 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
669 goto end;
670 }
671
672 result = 1;
673
674 end:
675 if (!result) {
676 TS_TST_INFO_free(tst_info);
677 tst_info = NULL;
678 TSerror(TS_R_TST_INFO_SETUP_ERROR);
679 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
680 "Error during TSTInfo "
681 "generation.");
682 }
683 GENERAL_NAME_free(tsa_name);
684 TS_ACCURACY_free(accuracy);
685 ASN1_GENERALIZEDTIME_free(asn1_time);
686 ASN1_INTEGER_free(serial);
687
688 return tst_info;
689 }
690
691 /* Processing the extensions of the request. */
692 static int
TS_RESP_process_extensions(TS_RESP_CTX * ctx)693 TS_RESP_process_extensions(TS_RESP_CTX *ctx)
694 {
695 STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
696 int i;
697 int ok = 1;
698
699 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
700 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
701 /* XXXXX The last argument was previously
702 (void *)ctx->extension_cb, but ISO C doesn't permit
703 converting a function pointer to void *. For lack of
704 better information, I'm placing a NULL there instead.
705 The callback can pick its own address out from the ctx
706 anyway...
707 */
708 ok = (*ctx->extension_cb)(ctx, ext, NULL);
709 }
710
711 return ok;
712 }
713
714 /* Functions for signing the TS_TST_INFO structure of the context. */
715 static int
TS_RESP_sign(TS_RESP_CTX * ctx)716 TS_RESP_sign(TS_RESP_CTX *ctx)
717 {
718 int ret = 0;
719 PKCS7 *p7 = NULL;
720 PKCS7_SIGNER_INFO *si;
721 STACK_OF(X509) *certs; /* Certificates to include in sc. */
722 ESS_SIGNING_CERT *sc = NULL;
723 ASN1_OBJECT *oid;
724 BIO *p7bio = NULL;
725 int i;
726
727 /* Check if signcert and pkey match. */
728 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
729 TSerror(TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
730 goto err;
731 }
732
733 /* Create a new PKCS7 signed object. */
734 if (!(p7 = PKCS7_new())) {
735 TSerror(ERR_R_MALLOC_FAILURE);
736 goto err;
737 }
738 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
739 goto err;
740
741 /* Force SignedData version to be 3 instead of the default 1. */
742 if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
743 goto err;
744
745 /* Add signer certificate and optional certificate chain. */
746 if (TS_REQ_get_cert_req(ctx->request)) {
747 PKCS7_add_certificate(p7, ctx->signer_cert);
748 if (ctx->certs) {
749 for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
750 X509 *cert = sk_X509_value(ctx->certs, i);
751 PKCS7_add_certificate(p7, cert);
752 }
753 }
754 }
755
756 /* Add a new signer info. */
757 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert,
758 ctx->signer_key, EVP_sha1()))) {
759 TSerror(TS_R_PKCS7_ADD_SIGNATURE_ERROR);
760 goto err;
761 }
762
763 /* Add content type signed attribute to the signer info. */
764 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
765 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
766 V_ASN1_OBJECT, oid)) {
767 TSerror(TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
768 goto err;
769 }
770
771 /* Create the ESS SigningCertificate attribute which contains
772 the signer certificate id and optionally the certificate chain. */
773 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
774 if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
775 goto err;
776
777 /* Add SigningCertificate signed attribute to the signer info. */
778 if (!ESS_add_signing_cert(si, sc)) {
779 TSerror(TS_R_ESS_ADD_SIGNING_CERT_ERROR);
780 goto err;
781 }
782
783 /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
784 if (!TS_TST_INFO_content_new(p7))
785 goto err;
786
787 /* Add the DER encoded tst_info to the PKCS7 structure. */
788 if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
789 TSerror(ERR_R_MALLOC_FAILURE);
790 goto err;
791 }
792
793 /* Convert tst_info to DER. */
794 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
795 TSerror(TS_R_TS_DATASIGN);
796 goto err;
797 }
798
799 /* Create the signature and add it to the signer info. */
800 if (!PKCS7_dataFinal(p7, p7bio)) {
801 TSerror(TS_R_TS_DATASIGN);
802 goto err;
803 }
804
805 /* Set new PKCS7 and TST_INFO objects. */
806 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
807 p7 = NULL; /* Ownership is lost. */
808 ctx->tst_info = NULL; /* Ownership is lost. */
809
810 ret = 1;
811
812 err:
813 if (!ret)
814 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
815 "Error during signature "
816 "generation.");
817 BIO_free_all(p7bio);
818 ESS_SIGNING_CERT_free(sc);
819 PKCS7_free(p7);
820 return ret;
821 }
822
823 static ESS_SIGNING_CERT *
ESS_SIGNING_CERT_new_init(X509 * signcert,STACK_OF (X509)* certs)824 ESS_SIGNING_CERT_new_init(X509 *signcert, STACK_OF(X509) *certs)
825 {
826 ESS_CERT_ID *cid;
827 ESS_SIGNING_CERT *sc = NULL;
828 int i;
829
830 /* Creating the ESS_CERT_ID stack. */
831 if (!(sc = ESS_SIGNING_CERT_new()))
832 goto err;
833 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
834 goto err;
835
836 /* Adding the signing certificate id. */
837 if (!(cid = ESS_CERT_ID_new_init(signcert, 0)) ||
838 !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
839 goto err;
840 /* Adding the certificate chain ids. */
841 for (i = 0; i < sk_X509_num(certs); ++i) {
842 X509 *cert = sk_X509_value(certs, i);
843 if (!(cid = ESS_CERT_ID_new_init(cert, 1)) ||
844 !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
845 goto err;
846 }
847
848 return sc;
849
850 err:
851 ESS_SIGNING_CERT_free(sc);
852 TSerror(ERR_R_MALLOC_FAILURE);
853 return NULL;
854 }
855
856 static ESS_CERT_ID *
ESS_CERT_ID_new_init(X509 * cert,int issuer_needed)857 ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
858 {
859 ESS_CERT_ID *cid = NULL;
860 GENERAL_NAME *name = NULL;
861 unsigned char cert_hash[TS_HASH_LEN];
862
863 /* Recompute SHA1 hash of certificate if necessary (side effect). */
864 X509_check_purpose(cert, -1, 0);
865
866 if (!(cid = ESS_CERT_ID_new()))
867 goto err;
868
869 if (!X509_digest(cert, TS_HASH_EVP, cert_hash, NULL))
870 goto err;
871
872 if (!ASN1_OCTET_STRING_set(cid->hash, cert_hash, sizeof(cert_hash)))
873 goto err;
874
875 /* Setting the issuer/serial if requested. */
876 if (issuer_needed) {
877 /* Creating issuer/serial structure. */
878 if (!cid->issuer_serial &&
879 !(cid->issuer_serial = ESS_ISSUER_SERIAL_new()))
880 goto err;
881 /* Creating general name from the certificate issuer. */
882 if (!(name = GENERAL_NAME_new()))
883 goto err;
884 name->type = GEN_DIRNAME;
885 if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
886 goto err;
887 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
888 goto err;
889 name = NULL; /* Ownership is lost. */
890 /* Setting the serial number. */
891 ASN1_INTEGER_free(cid->issuer_serial->serial);
892 if (!(cid->issuer_serial->serial =
893 ASN1_INTEGER_dup(X509_get_serialNumber(cert))))
894 goto err;
895 }
896
897 return cid;
898
899 err:
900 GENERAL_NAME_free(name);
901 ESS_CERT_ID_free(cid);
902 TSerror(ERR_R_MALLOC_FAILURE);
903 return NULL;
904 }
905
906 static int
TS_TST_INFO_content_new(PKCS7 * p7)907 TS_TST_INFO_content_new(PKCS7 *p7)
908 {
909 PKCS7 *ret = NULL;
910 ASN1_OCTET_STRING *octet_string = NULL;
911
912 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
913 if (!(ret = PKCS7_new()))
914 goto err;
915 if (!(ret->d.other = ASN1_TYPE_new()))
916 goto err;
917 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
918 if (!(octet_string = ASN1_OCTET_STRING_new()))
919 goto err;
920 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
921 octet_string = NULL;
922
923 /* Add encapsulated content to signed PKCS7 structure. */
924 if (!PKCS7_set_content(p7, ret))
925 goto err;
926
927 return 1;
928
929 err:
930 ASN1_OCTET_STRING_free(octet_string);
931 PKCS7_free(ret);
932 return 0;
933 }
934
935 static int
ESS_add_signing_cert(PKCS7_SIGNER_INFO * si,ESS_SIGNING_CERT * sc)936 ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
937 {
938 ASN1_STRING *seq = NULL;
939 unsigned char *p, *pp = NULL;
940 int len;
941
942 len = i2d_ESS_SIGNING_CERT(sc, NULL);
943 if (!(pp = malloc(len))) {
944 TSerror(ERR_R_MALLOC_FAILURE);
945 goto err;
946 }
947 p = pp;
948 i2d_ESS_SIGNING_CERT(sc, &p);
949 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
950 TSerror(ERR_R_MALLOC_FAILURE);
951 goto err;
952 }
953 free(pp);
954 pp = NULL;
955 return PKCS7_add_signed_attribute(si,
956 NID_id_smime_aa_signingCertificate, V_ASN1_SEQUENCE, seq);
957
958 err:
959 ASN1_STRING_free(seq);
960 free(pp);
961
962 return 0;
963 }
964
965
966 static ASN1_GENERALIZEDTIME *
TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME * asn1_time,time_t sec,long usec,unsigned precision)967 TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time,
968 time_t sec, long usec, unsigned precision)
969 {
970 struct tm *tm = NULL;
971 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
972 char usecstr[TS_MAX_CLOCK_PRECISION_DIGITS + 2];
973 char *p;
974 int rv;
975
976 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
977 goto err;
978
979 if (!(tm = gmtime(&sec)))
980 goto err;
981
982 /*
983 * Put "genTime_str" in GeneralizedTime format. We work around the
984 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
985 * NOT include fractional seconds") and OpenSSL related functions to
986 * meet the rfc3161 requirement: "GeneralizedTime syntax can include
987 * fraction-of-second details".
988 */
989 if (precision > 0) {
990 /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides
991 the following restrictions for a DER-encoding, which OpenSSL
992 (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
993 support:
994 "The encoding MUST terminate with a "Z" (which means "Zulu"
995 time). The decimal point element, if present, MUST be the
996 point option ".". The fractional-seconds elements,
997 if present, MUST omit all trailing 0's;
998 if the elements correspond to 0, they MUST be wholly
999 omitted, and the decimal point element also MUST be
1000 omitted." */
1001 (void) snprintf(usecstr, sizeof(usecstr), ".%06ld", usec);
1002 /* truncate and trim trailing 0 */
1003 usecstr[precision + 1] = '\0';
1004 p = usecstr + strlen(usecstr) - 1;
1005 while (p > usecstr && *p == '0')
1006 *p-- = '\0';
1007 /* if we've reached the beginning, delete the . too */
1008 if (p == usecstr)
1009 *p = '\0';
1010
1011 } else {
1012 /* empty */
1013 usecstr[0] = '\0';
1014 }
1015 rv = snprintf(genTime_str, sizeof(genTime_str),
1016 "%04d%02d%02d%02d%02d%02d%sZ",
1017 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1018 tm->tm_hour, tm->tm_min, tm->tm_sec, usecstr);
1019 if (rv < 0 || rv >= sizeof(genTime_str))
1020 goto err;
1021
1022 /* Now call OpenSSL to check and set our genTime value */
1023 if (!asn1_time && !(asn1_time = ASN1_GENERALIZEDTIME_new()))
1024 goto err;
1025 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
1026 ASN1_GENERALIZEDTIME_free(asn1_time);
1027 goto err;
1028 }
1029
1030 return asn1_time;
1031
1032 err:
1033 TSerror(TS_R_COULD_NOT_SET_TIME);
1034 return NULL;
1035 }
1036