1 /* $OpenBSD: ts_rsp_sign.c,v 1.23 2019/07/03 03:24:04 deraadt 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 /* Private function declarations. */
69
70 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
71 static int def_time_cb(struct TS_resp_ctx *, void *, time_t *sec, long *usec);
72 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
73
74 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
75 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
76 static int TS_RESP_check_request(TS_RESP_CTX *ctx);
77 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
78 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
79 ASN1_OBJECT *policy);
80 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
81 static int TS_RESP_sign(TS_RESP_CTX *ctx);
82
83 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
84 STACK_OF(X509) *certs);
85 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
86 static int TS_TST_INFO_content_new(PKCS7 *p7);
87 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
88
89 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
90 ASN1_GENERALIZEDTIME *, time_t, long, unsigned);
91
92 /* Default callbacks for response generation. */
93
94 static ASN1_INTEGER *
def_serial_cb(struct TS_resp_ctx * ctx,void * data)95 def_serial_cb(struct TS_resp_ctx *ctx, void *data)
96 {
97 ASN1_INTEGER *serial = ASN1_INTEGER_new();
98
99 if (!serial)
100 goto err;
101 if (!ASN1_INTEGER_set(serial, 1))
102 goto err;
103 return serial;
104
105 err:
106 TSerror(ERR_R_MALLOC_FAILURE);
107 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
108 "Error during serial number generation.");
109 return NULL;
110 }
111
112 /* Use the gettimeofday function call. */
113 static int
def_time_cb(struct TS_resp_ctx * ctx,void * data,time_t * sec,long * usec)114 def_time_cb(struct TS_resp_ctx *ctx, void *data, time_t *sec, long *usec)
115 {
116 struct timeval tv;
117
118 if (gettimeofday(&tv, NULL) != 0) {
119 TSerror(TS_R_TIME_SYSCALL_ERROR);
120 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
121 "Time is not available.");
122 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
123 return 0;
124 }
125 /* Return time to caller. */
126 *sec = tv.tv_sec;
127 *usec = tv.tv_usec;
128
129 return 1;
130 }
131
132 static int
def_extension_cb(struct TS_resp_ctx * ctx,X509_EXTENSION * ext,void * data)133 def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, void *data)
134 {
135 /* No extensions are processed here. */
136 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
137 "Unsupported extension.");
138 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
139 return 0;
140 }
141
142 /* TS_RESP_CTX management functions. */
143
144 TS_RESP_CTX *
TS_RESP_CTX_new(void)145 TS_RESP_CTX_new(void)
146 {
147 TS_RESP_CTX *ctx;
148
149 if (!(ctx = calloc(1, sizeof(TS_RESP_CTX)))) {
150 TSerror(ERR_R_MALLOC_FAILURE);
151 return NULL;
152 }
153
154 /* Setting default callbacks. */
155 ctx->serial_cb = def_serial_cb;
156 ctx->time_cb = def_time_cb;
157 ctx->extension_cb = def_extension_cb;
158
159 return ctx;
160 }
161
162 void
TS_RESP_CTX_free(TS_RESP_CTX * ctx)163 TS_RESP_CTX_free(TS_RESP_CTX *ctx)
164 {
165 if (!ctx)
166 return;
167
168 X509_free(ctx->signer_cert);
169 EVP_PKEY_free(ctx->signer_key);
170 sk_X509_pop_free(ctx->certs, X509_free);
171 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
172 ASN1_OBJECT_free(ctx->default_policy);
173 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */
174 ASN1_INTEGER_free(ctx->seconds);
175 ASN1_INTEGER_free(ctx->millis);
176 ASN1_INTEGER_free(ctx->micros);
177 free(ctx);
178 }
179
180 int
TS_RESP_CTX_set_signer_cert(TS_RESP_CTX * ctx,X509 * signer)181 TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
182 {
183 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
184 TSerror(TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
185 return 0;
186 }
187 X509_free(ctx->signer_cert);
188 ctx->signer_cert = signer;
189 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
190 return 1;
191 }
192
193 int
TS_RESP_CTX_set_signer_key(TS_RESP_CTX * ctx,EVP_PKEY * key)194 TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
195 {
196 EVP_PKEY_free(ctx->signer_key);
197 ctx->signer_key = key;
198 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
199
200 return 1;
201 }
202
203 int
TS_RESP_CTX_set_def_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * def_policy)204 TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
205 {
206 if (ctx->default_policy)
207 ASN1_OBJECT_free(ctx->default_policy);
208 if (!(ctx->default_policy = OBJ_dup(def_policy)))
209 goto err;
210 return 1;
211
212 err:
213 TSerror(ERR_R_MALLOC_FAILURE);
214 return 0;
215 }
216
217 int
TS_RESP_CTX_set_certs(TS_RESP_CTX * ctx,STACK_OF (X509)* certs)218 TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
219 {
220 int i;
221
222 if (ctx->certs) {
223 sk_X509_pop_free(ctx->certs, X509_free);
224 ctx->certs = NULL;
225 }
226 if (!certs)
227 return 1;
228 if (!(ctx->certs = sk_X509_dup(certs))) {
229 TSerror(ERR_R_MALLOC_FAILURE);
230 return 0;
231 }
232 for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
233 X509 *cert = sk_X509_value(ctx->certs, i);
234 CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509);
235 }
236
237 return 1;
238 }
239
240 int
TS_RESP_CTX_add_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * policy)241 TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
242 {
243 ASN1_OBJECT *copy = NULL;
244
245 /* Create new policy stack if necessary. */
246 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null()))
247 goto err;
248 if (!(copy = OBJ_dup(policy)))
249 goto err;
250 if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
251 goto err;
252
253 return 1;
254
255 err:
256 TSerror(ERR_R_MALLOC_FAILURE);
257 ASN1_OBJECT_free(copy);
258 return 0;
259 }
260
261 int
TS_RESP_CTX_add_md(TS_RESP_CTX * ctx,const EVP_MD * md)262 TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
263 {
264 /* Create new md stack if necessary. */
265 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null()))
266 goto err;
267 /* Add the shared md, no copy needed. */
268 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md))
269 goto err;
270
271 return 1;
272
273 err:
274 TSerror(ERR_R_MALLOC_FAILURE);
275 return 0;
276 }
277
278 #define TS_RESP_CTX_accuracy_free(ctx) \
279 ASN1_INTEGER_free(ctx->seconds); \
280 ctx->seconds = NULL; \
281 ASN1_INTEGER_free(ctx->millis); \
282 ctx->millis = NULL; \
283 ASN1_INTEGER_free(ctx->micros); \
284 ctx->micros = NULL;
285
286 int
TS_RESP_CTX_set_accuracy(TS_RESP_CTX * ctx,int secs,int millis,int micros)287 TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, int secs, int millis, int micros)
288 {
289 TS_RESP_CTX_accuracy_free(ctx);
290 if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) ||
291 !ASN1_INTEGER_set(ctx->seconds, secs)))
292 goto err;
293 if (millis && (!(ctx->millis = ASN1_INTEGER_new()) ||
294 !ASN1_INTEGER_set(ctx->millis, millis)))
295 goto err;
296 if (micros && (!(ctx->micros = ASN1_INTEGER_new()) ||
297 !ASN1_INTEGER_set(ctx->micros, micros)))
298 goto err;
299
300 return 1;
301
302 err:
303 TS_RESP_CTX_accuracy_free(ctx);
304 TSerror(ERR_R_MALLOC_FAILURE);
305 return 0;
306 }
307
308 void
TS_RESP_CTX_add_flags(TS_RESP_CTX * ctx,int flags)309 TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
310 {
311 ctx->flags |= flags;
312 }
313
314 void
TS_RESP_CTX_set_serial_cb(TS_RESP_CTX * ctx,TS_serial_cb cb,void * data)315 TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
316 {
317 ctx->serial_cb = cb;
318 ctx->serial_cb_data = data;
319 }
320
321 void
TS_RESP_CTX_set_extension_cb(TS_RESP_CTX * ctx,TS_extension_cb cb,void * data)322 TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, TS_extension_cb cb, void *data)
323 {
324 ctx->extension_cb = cb;
325 ctx->extension_cb_data = data;
326 }
327
328 int
TS_RESP_CTX_set_status_info(TS_RESP_CTX * ctx,int status,const char * text)329 TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, int status, const char *text)
330 {
331 TS_STATUS_INFO *si = NULL;
332 ASN1_UTF8STRING *utf8_text = NULL;
333 int ret = 0;
334
335 if (!(si = TS_STATUS_INFO_new()))
336 goto err;
337 if (!ASN1_INTEGER_set(si->status, status))
338 goto err;
339 if (text) {
340 if (!(utf8_text = ASN1_UTF8STRING_new()) ||
341 !ASN1_STRING_set(utf8_text, text, strlen(text)))
342 goto err;
343 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
344 goto err;
345 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
346 goto err;
347 utf8_text = NULL; /* Ownership is lost. */
348 }
349 if (!TS_RESP_set_status_info(ctx->response, si))
350 goto err;
351 ret = 1;
352
353 err:
354 if (!ret)
355 TSerror(ERR_R_MALLOC_FAILURE);
356 TS_STATUS_INFO_free(si);
357 ASN1_UTF8STRING_free(utf8_text);
358 return ret;
359 }
360
361 int
TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX * ctx,int status,const char * text)362 TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, int status, const char *text)
363 {
364 int ret = 1;
365 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
366
367 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
368 /* Status has not been set, set it now. */
369 ret = TS_RESP_CTX_set_status_info(ctx, status, text);
370 }
371 return ret;
372 }
373
374 int
TS_RESP_CTX_add_failure_info(TS_RESP_CTX * ctx,int failure)375 TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
376 {
377 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
378
379 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
380 goto err;
381 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
382 goto err;
383 return 1;
384
385 err:
386 TSerror(ERR_R_MALLOC_FAILURE);
387 return 0;
388 }
389
390 TS_REQ *
TS_RESP_CTX_get_request(TS_RESP_CTX * ctx)391 TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
392 {
393 return ctx->request;
394 }
395
396 TS_TST_INFO *
TS_RESP_CTX_get_tst_info(TS_RESP_CTX * ctx)397 TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
398 {
399 return ctx->tst_info;
400 }
401
402 int
TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX * ctx,unsigned precision)403 TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision)
404 {
405 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
406 return 0;
407 ctx->clock_precision_digits = precision;
408 return 1;
409 }
410
411 /* Main entry method of the response generation. */
412 TS_RESP *
TS_RESP_create_response(TS_RESP_CTX * ctx,BIO * req_bio)413 TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
414 {
415 ASN1_OBJECT *policy;
416 TS_RESP *response;
417 int result = 0;
418
419 TS_RESP_CTX_init(ctx);
420
421 /* Creating the response object. */
422 if (!(ctx->response = TS_RESP_new())) {
423 TSerror(ERR_R_MALLOC_FAILURE);
424 goto end;
425 }
426
427 /* Parsing DER request. */
428 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) {
429 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
430 "Bad request format or "
431 "system error.");
432 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
433 goto end;
434 }
435
436 /* Setting default status info. */
437 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
438 goto end;
439
440 /* Checking the request format. */
441 if (!TS_RESP_check_request(ctx))
442 goto end;
443
444 /* Checking acceptable policies. */
445 if (!(policy = TS_RESP_get_policy(ctx)))
446 goto end;
447
448 /* Creating the TS_TST_INFO object. */
449 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
450 goto end;
451
452 /* Processing extensions. */
453 if (!TS_RESP_process_extensions(ctx))
454 goto end;
455
456 /* Generating the signature. */
457 if (!TS_RESP_sign(ctx))
458 goto end;
459
460 /* Everything was successful. */
461 result = 1;
462
463 end:
464 if (!result) {
465 TSerror(TS_R_RESPONSE_SETUP_ERROR);
466 if (ctx->response != NULL) {
467 if (TS_RESP_CTX_set_status_info_cond(ctx,
468 TS_STATUS_REJECTION, "Error during response "
469 "generation.") == 0) {
470 TS_RESP_free(ctx->response);
471 ctx->response = NULL;
472 }
473 }
474 }
475 response = ctx->response;
476 ctx->response = NULL; /* Ownership will be returned to caller. */
477 TS_RESP_CTX_cleanup(ctx);
478 return response;
479 }
480
481 /* Initializes the variable part of the context. */
482 static void
TS_RESP_CTX_init(TS_RESP_CTX * ctx)483 TS_RESP_CTX_init(TS_RESP_CTX *ctx)
484 {
485 ctx->request = NULL;
486 ctx->response = NULL;
487 ctx->tst_info = NULL;
488 }
489
490 /* Cleans up the variable part of the context. */
491 static void
TS_RESP_CTX_cleanup(TS_RESP_CTX * ctx)492 TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
493 {
494 TS_REQ_free(ctx->request);
495 ctx->request = NULL;
496 TS_RESP_free(ctx->response);
497 ctx->response = NULL;
498 TS_TST_INFO_free(ctx->tst_info);
499 ctx->tst_info = NULL;
500 }
501
502 /* Checks the format and content of the request. */
503 static int
TS_RESP_check_request(TS_RESP_CTX * ctx)504 TS_RESP_check_request(TS_RESP_CTX *ctx)
505 {
506 TS_REQ *request = ctx->request;
507 TS_MSG_IMPRINT *msg_imprint;
508 X509_ALGOR *md_alg;
509 int md_alg_id;
510 const ASN1_OCTET_STRING *digest;
511 EVP_MD *md = NULL;
512 int i;
513
514 /* Checking request version. */
515 if (TS_REQ_get_version(request) != 1) {
516 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
517 "Bad request version.");
518 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
519 return 0;
520 }
521
522 /* Checking message digest algorithm. */
523 msg_imprint = TS_REQ_get_msg_imprint(request);
524 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
525 md_alg_id = OBJ_obj2nid(md_alg->algorithm);
526 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
527 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
528 if (md_alg_id == EVP_MD_type(current_md))
529 md = current_md;
530 }
531 if (!md) {
532 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
533 "Message digest algorithm is "
534 "not supported.");
535 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
536 return 0;
537 }
538
539 /* No message digest takes parameter. */
540 if (md_alg->parameter &&
541 ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
542 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
543 "Superfluous message digest "
544 "parameter.");
545 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
546 return 0;
547 }
548 /* Checking message digest size. */
549 digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
550 if (digest->length != EVP_MD_size(md)) {
551 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
552 "Bad message digest.");
553 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
554 return 0;
555 }
556
557 return 1;
558 }
559
560 /* Returns the TSA policy based on the requested and acceptable policies. */
561 static ASN1_OBJECT *
TS_RESP_get_policy(TS_RESP_CTX * ctx)562 TS_RESP_get_policy(TS_RESP_CTX *ctx)
563 {
564 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
565 ASN1_OBJECT *policy = NULL;
566 int i;
567
568 if (ctx->default_policy == NULL) {
569 TSerror(TS_R_INVALID_NULL_POINTER);
570 return NULL;
571 }
572 /* Return the default policy if none is requested or the default is
573 requested. */
574 if (!requested || !OBJ_cmp(requested, ctx->default_policy))
575 policy = ctx->default_policy;
576
577 /* Check if the policy is acceptable. */
578 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
579 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
580 if (!OBJ_cmp(requested, current))
581 policy = current;
582 }
583 if (!policy) {
584 TSerror(TS_R_UNACCEPTABLE_POLICY);
585 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
586 "Requested policy is not "
587 "supported.");
588 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
589 }
590 return policy;
591 }
592
593 /* Creates the TS_TST_INFO object based on the settings of the context. */
594 static TS_TST_INFO *
TS_RESP_create_tst_info(TS_RESP_CTX * ctx,ASN1_OBJECT * policy)595 TS_RESP_create_tst_info(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
596 {
597 int result = 0;
598 TS_TST_INFO *tst_info = NULL;
599 ASN1_INTEGER *serial = NULL;
600 ASN1_GENERALIZEDTIME *asn1_time = NULL;
601 time_t sec;
602 long usec;
603 TS_ACCURACY *accuracy = NULL;
604 const ASN1_INTEGER *nonce;
605 GENERAL_NAME *tsa_name = NULL;
606
607 if (!(tst_info = TS_TST_INFO_new()))
608 goto end;
609 if (!TS_TST_INFO_set_version(tst_info, 1))
610 goto end;
611 if (!TS_TST_INFO_set_policy_id(tst_info, policy))
612 goto end;
613 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
614 goto end;
615 if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data)) ||
616 !TS_TST_INFO_set_serial(tst_info, serial))
617 goto end;
618 if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec) ||
619 !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, sec, usec,
620 ctx->clock_precision_digits)) ||
621 !TS_TST_INFO_set_time(tst_info, asn1_time))
622 goto end;
623
624 /* Setting accuracy if needed. */
625 if ((ctx->seconds || ctx->millis || ctx->micros) &&
626 !(accuracy = TS_ACCURACY_new()))
627 goto end;
628
629 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
630 goto end;
631 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
632 goto end;
633 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
634 goto end;
635 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
636 goto end;
637
638 /* Setting ordering. */
639 if ((ctx->flags & TS_ORDERING) &&
640 !TS_TST_INFO_set_ordering(tst_info, 1))
641 goto end;
642
643 /* Setting nonce if needed. */
644 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL &&
645 !TS_TST_INFO_set_nonce(tst_info, nonce))
646 goto end;
647
648 /* Setting TSA name to subject of signer certificate. */
649 if (ctx->flags & TS_TSA_NAME) {
650 if (!(tsa_name = GENERAL_NAME_new()))
651 goto end;
652 tsa_name->type = GEN_DIRNAME;
653 tsa_name->d.dirn =
654 X509_NAME_dup(ctx->signer_cert->cert_info->subject);
655 if (!tsa_name->d.dirn)
656 goto end;
657 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
658 goto end;
659 }
660
661 result = 1;
662
663 end:
664 if (!result) {
665 TS_TST_INFO_free(tst_info);
666 tst_info = NULL;
667 TSerror(TS_R_TST_INFO_SETUP_ERROR);
668 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
669 "Error during TSTInfo "
670 "generation.");
671 }
672 GENERAL_NAME_free(tsa_name);
673 TS_ACCURACY_free(accuracy);
674 ASN1_GENERALIZEDTIME_free(asn1_time);
675 ASN1_INTEGER_free(serial);
676
677 return tst_info;
678 }
679
680 /* Processing the extensions of the request. */
681 static int
TS_RESP_process_extensions(TS_RESP_CTX * ctx)682 TS_RESP_process_extensions(TS_RESP_CTX *ctx)
683 {
684 STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
685 int i;
686 int ok = 1;
687
688 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
689 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
690 /* XXXXX The last argument was previously
691 (void *)ctx->extension_cb, but ISO C doesn't permit
692 converting a function pointer to void *. For lack of
693 better information, I'm placing a NULL there instead.
694 The callback can pick its own address out from the ctx
695 anyway...
696 */
697 ok = (*ctx->extension_cb)(ctx, ext, NULL);
698 }
699
700 return ok;
701 }
702
703 /* Functions for signing the TS_TST_INFO structure of the context. */
704 static int
TS_RESP_sign(TS_RESP_CTX * ctx)705 TS_RESP_sign(TS_RESP_CTX *ctx)
706 {
707 int ret = 0;
708 PKCS7 *p7 = NULL;
709 PKCS7_SIGNER_INFO *si;
710 STACK_OF(X509) *certs; /* Certificates to include in sc. */
711 ESS_SIGNING_CERT *sc = NULL;
712 ASN1_OBJECT *oid;
713 BIO *p7bio = NULL;
714 int i;
715
716 /* Check if signcert and pkey match. */
717 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
718 TSerror(TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
719 goto err;
720 }
721
722 /* Create a new PKCS7 signed object. */
723 if (!(p7 = PKCS7_new())) {
724 TSerror(ERR_R_MALLOC_FAILURE);
725 goto err;
726 }
727 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
728 goto err;
729
730 /* Force SignedData version to be 3 instead of the default 1. */
731 if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
732 goto err;
733
734 /* Add signer certificate and optional certificate chain. */
735 if (TS_REQ_get_cert_req(ctx->request)) {
736 PKCS7_add_certificate(p7, ctx->signer_cert);
737 if (ctx->certs) {
738 for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
739 X509 *cert = sk_X509_value(ctx->certs, i);
740 PKCS7_add_certificate(p7, cert);
741 }
742 }
743 }
744
745 /* Add a new signer info. */
746 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert,
747 ctx->signer_key, EVP_sha1()))) {
748 TSerror(TS_R_PKCS7_ADD_SIGNATURE_ERROR);
749 goto err;
750 }
751
752 /* Add content type signed attribute to the signer info. */
753 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
754 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
755 V_ASN1_OBJECT, oid)) {
756 TSerror(TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
757 goto err;
758 }
759
760 /* Create the ESS SigningCertificate attribute which contains
761 the signer certificate id and optionally the certificate chain. */
762 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
763 if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
764 goto err;
765
766 /* Add SigningCertificate signed attribute to the signer info. */
767 if (!ESS_add_signing_cert(si, sc)) {
768 TSerror(TS_R_ESS_ADD_SIGNING_CERT_ERROR);
769 goto err;
770 }
771
772 /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
773 if (!TS_TST_INFO_content_new(p7))
774 goto err;
775
776 /* Add the DER encoded tst_info to the PKCS7 structure. */
777 if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
778 TSerror(ERR_R_MALLOC_FAILURE);
779 goto err;
780 }
781
782 /* Convert tst_info to DER. */
783 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
784 TSerror(TS_R_TS_DATASIGN);
785 goto err;
786 }
787
788 /* Create the signature and add it to the signer info. */
789 if (!PKCS7_dataFinal(p7, p7bio)) {
790 TSerror(TS_R_TS_DATASIGN);
791 goto err;
792 }
793
794 /* Set new PKCS7 and TST_INFO objects. */
795 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
796 p7 = NULL; /* Ownership is lost. */
797 ctx->tst_info = NULL; /* Ownership is lost. */
798
799 ret = 1;
800
801 err:
802 if (!ret)
803 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
804 "Error during signature "
805 "generation.");
806 BIO_free_all(p7bio);
807 ESS_SIGNING_CERT_free(sc);
808 PKCS7_free(p7);
809 return ret;
810 }
811
812 static ESS_SIGNING_CERT *
ESS_SIGNING_CERT_new_init(X509 * signcert,STACK_OF (X509)* certs)813 ESS_SIGNING_CERT_new_init(X509 *signcert, STACK_OF(X509) *certs)
814 {
815 ESS_CERT_ID *cid;
816 ESS_SIGNING_CERT *sc = NULL;
817 int i;
818
819 /* Creating the ESS_CERT_ID stack. */
820 if (!(sc = ESS_SIGNING_CERT_new()))
821 goto err;
822 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
823 goto err;
824
825 /* Adding the signing certificate id. */
826 if (!(cid = ESS_CERT_ID_new_init(signcert, 0)) ||
827 !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
828 goto err;
829 /* Adding the certificate chain ids. */
830 for (i = 0; i < sk_X509_num(certs); ++i) {
831 X509 *cert = sk_X509_value(certs, i);
832 if (!(cid = ESS_CERT_ID_new_init(cert, 1)) ||
833 !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
834 goto err;
835 }
836
837 return sc;
838
839 err:
840 ESS_SIGNING_CERT_free(sc);
841 TSerror(ERR_R_MALLOC_FAILURE);
842 return NULL;
843 }
844
845 static ESS_CERT_ID *
ESS_CERT_ID_new_init(X509 * cert,int issuer_needed)846 ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
847 {
848 ESS_CERT_ID *cid = NULL;
849 GENERAL_NAME *name = NULL;
850
851 /* Recompute SHA1 hash of certificate if necessary (side effect). */
852 X509_check_purpose(cert, -1, 0);
853
854 if (!(cid = ESS_CERT_ID_new()))
855 goto err;
856 if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash,
857 sizeof(cert->sha1_hash)))
858 goto err;
859
860 /* Setting the issuer/serial if requested. */
861 if (issuer_needed) {
862 /* Creating issuer/serial structure. */
863 if (!cid->issuer_serial &&
864 !(cid->issuer_serial = ESS_ISSUER_SERIAL_new()))
865 goto err;
866 /* Creating general name from the certificate issuer. */
867 if (!(name = GENERAL_NAME_new()))
868 goto err;
869 name->type = GEN_DIRNAME;
870 if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer)))
871 goto err;
872 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
873 goto err;
874 name = NULL; /* Ownership is lost. */
875 /* Setting the serial number. */
876 ASN1_INTEGER_free(cid->issuer_serial->serial);
877 if (!(cid->issuer_serial->serial =
878 ASN1_INTEGER_dup(cert->cert_info->serialNumber)))
879 goto err;
880 }
881
882 return cid;
883
884 err:
885 GENERAL_NAME_free(name);
886 ESS_CERT_ID_free(cid);
887 TSerror(ERR_R_MALLOC_FAILURE);
888 return NULL;
889 }
890
891 static int
TS_TST_INFO_content_new(PKCS7 * p7)892 TS_TST_INFO_content_new(PKCS7 *p7)
893 {
894 PKCS7 *ret = NULL;
895 ASN1_OCTET_STRING *octet_string = NULL;
896
897 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
898 if (!(ret = PKCS7_new()))
899 goto err;
900 if (!(ret->d.other = ASN1_TYPE_new()))
901 goto err;
902 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
903 if (!(octet_string = ASN1_OCTET_STRING_new()))
904 goto err;
905 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
906 octet_string = NULL;
907
908 /* Add encapsulated content to signed PKCS7 structure. */
909 if (!PKCS7_set_content(p7, ret))
910 goto err;
911
912 return 1;
913
914 err:
915 ASN1_OCTET_STRING_free(octet_string);
916 PKCS7_free(ret);
917 return 0;
918 }
919
920 static int
ESS_add_signing_cert(PKCS7_SIGNER_INFO * si,ESS_SIGNING_CERT * sc)921 ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
922 {
923 ASN1_STRING *seq = NULL;
924 unsigned char *p, *pp = NULL;
925 int len;
926
927 len = i2d_ESS_SIGNING_CERT(sc, NULL);
928 if (!(pp = malloc(len))) {
929 TSerror(ERR_R_MALLOC_FAILURE);
930 goto err;
931 }
932 p = pp;
933 i2d_ESS_SIGNING_CERT(sc, &p);
934 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
935 TSerror(ERR_R_MALLOC_FAILURE);
936 goto err;
937 }
938 free(pp);
939 pp = NULL;
940 return PKCS7_add_signed_attribute(si,
941 NID_id_smime_aa_signingCertificate, V_ASN1_SEQUENCE, seq);
942
943 err:
944 ASN1_STRING_free(seq);
945 free(pp);
946
947 return 0;
948 }
949
950
951 static ASN1_GENERALIZEDTIME *
TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME * asn1_time,time_t sec,long usec,unsigned precision)952 TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time,
953 time_t sec, long usec, unsigned precision)
954 {
955 struct tm *tm = NULL;
956 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
957 char usecstr[TS_MAX_CLOCK_PRECISION_DIGITS + 2];
958 char *p;
959 int rv;
960
961 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
962 goto err;
963
964 if (!(tm = gmtime(&sec)))
965 goto err;
966
967 /*
968 * Put "genTime_str" in GeneralizedTime format. We work around the
969 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
970 * NOT include fractional seconds") and OpenSSL related functions to
971 * meet the rfc3161 requirement: "GeneralizedTime syntax can include
972 * fraction-of-second details".
973 */
974 if (precision > 0) {
975 /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides
976 the following restrictions for a DER-encoding, which OpenSSL
977 (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
978 support:
979 "The encoding MUST terminate with a "Z" (which means "Zulu"
980 time). The decimal point element, if present, MUST be the
981 point option ".". The fractional-seconds elements,
982 if present, MUST omit all trailing 0's;
983 if the elements correspond to 0, they MUST be wholly
984 omitted, and the decimal point element also MUST be
985 omitted." */
986 (void) snprintf(usecstr, sizeof(usecstr), ".%06ld", usec);
987 /* truncate and trim trailing 0 */
988 usecstr[precision + 1] = '\0';
989 p = usecstr + strlen(usecstr) - 1;
990 while (p > usecstr && *p == '0')
991 *p-- = '\0';
992 /* if we've reached the beginning, delete the . too */
993 if (p == usecstr)
994 *p = '\0';
995
996 } else {
997 /* empty */
998 usecstr[0] = '\0';
999 }
1000 rv = snprintf(genTime_str, sizeof(genTime_str),
1001 "%04d%02d%02d%02d%02d%02d%sZ",
1002 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1003 tm->tm_hour, tm->tm_min, tm->tm_sec, usecstr);
1004 if (rv < 0 || rv >= sizeof(genTime_str))
1005 goto err;
1006
1007 /* Now call OpenSSL to check and set our genTime value */
1008 if (!asn1_time && !(asn1_time = ASN1_GENERALIZEDTIME_new()))
1009 goto err;
1010 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
1011 ASN1_GENERALIZEDTIME_free(asn1_time);
1012 goto err;
1013 }
1014
1015 return asn1_time;
1016
1017 err:
1018 TSerror(TS_R_COULD_NOT_SET_TIME);
1019 return NULL;
1020 }
1021