1 /* crypto/ts/ts_resp_sign.c */
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 "cryptlib.h"
60
61 #if defined(OPENSSL_SYS_UNIX)
62 #include <sys/time.h>
63 #endif
64
65 #include <openssl/objects.h>
66 #include <openssl/ts.h>
67 #include <openssl/pkcs7.h>
68
69 /* Private function declarations. */
70
71 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
72 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
73 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
74
75 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
76 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
77 static int TS_RESP_check_request(TS_RESP_CTX *ctx);
78 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
79 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
80 ASN1_OBJECT *policy);
81 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
82 static int TS_RESP_sign(TS_RESP_CTX *ctx);
83
84 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
85 STACK_OF(X509) *certs);
86 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
87 static int TS_TST_INFO_content_new(PKCS7 *p7);
88 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
89
90 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
91 ASN1_GENERALIZEDTIME *, long, long, unsigned);
92
93 /* Default callbacks for response generation. */
94
95 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
96 {
97 ASN1_INTEGER *serial = ASN1_INTEGER_new();
98 if (!serial) goto err;
99 if (!ASN1_INTEGER_set(serial, 1)) goto err;
100 return serial;
101 err:
102 TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
103 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
104 "Error during serial number generation.");
105 return NULL;
106 }
107
108 #if defined(OPENSSL_SYS_UNIX)
109
110 /* Use the gettimeofday function call. */
111 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
112 long *sec, long *usec)
113 {
114 struct timeval tv;
115 if (gettimeofday(&tv, NULL) != 0)
116 {
117 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
118 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
119 "Time is not available.");
120 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
121 return 0;
122 }
123 /* Return time to caller. */
124 *sec = tv.tv_sec;
125 *usec = tv.tv_usec;
126
127 return 1;
128 }
129
130 #else
131
132 /* Use the time function call that provides only seconds precision. */
133 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
134 long *sec, long *usec)
135 {
136 time_t t;
137 if (time(&t) == (time_t) -1)
138 {
139 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
140 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
141 "Time is not available.");
142 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
143 return 0;
144 }
145 /* Return time to caller, only second precision. */
146 *sec = (long) t;
147 *usec = 0;
148
149 return 1;
150 }
151
152 #endif
153
154 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
155 void *data)
156 {
157 /* No extensions are processed here. */
158 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
159 "Unsupported extension.");
160 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
161 return 0;
162 }
163
164 /* TS_RESP_CTX management functions. */
165
166 TS_RESP_CTX *TS_RESP_CTX_new()
167 {
168 TS_RESP_CTX *ctx;
169
170 if (!(ctx = (TS_RESP_CTX *) OPENSSL_malloc(sizeof(TS_RESP_CTX))))
171 {
172 TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
173 return NULL;
174 }
175 memset(ctx, 0, sizeof(TS_RESP_CTX));
176
177 /* Setting default callbacks. */
178 ctx->serial_cb = def_serial_cb;
179 ctx->time_cb = def_time_cb;
180 ctx->extension_cb = def_extension_cb;
181
182 return ctx;
183 }
184
185 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
186 {
187 if (!ctx) return;
188
189 X509_free(ctx->signer_cert);
190 EVP_PKEY_free(ctx->signer_key);
191 sk_X509_pop_free(ctx->certs, X509_free);
192 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
193 ASN1_OBJECT_free(ctx->default_policy);
194 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */
195 ASN1_INTEGER_free(ctx->seconds);
196 ASN1_INTEGER_free(ctx->millis);
197 ASN1_INTEGER_free(ctx->micros);
198 OPENSSL_free(ctx);
199 }
200
201 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
202 {
203 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1)
204 {
205 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
206 TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
207 return 0;
208 }
209 if (ctx->signer_cert) X509_free(ctx->signer_cert);
210 ctx->signer_cert = signer;
211 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
212 return 1;
213 }
214
215 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
216 {
217 if (ctx->signer_key) EVP_PKEY_free(ctx->signer_key);
218 ctx->signer_key = key;
219 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
220
221 return 1;
222 }
223
224 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
225 {
226 if (ctx->default_policy) ASN1_OBJECT_free(ctx->default_policy);
227 if (!(ctx->default_policy = OBJ_dup(def_policy))) goto err;
228 return 1;
229 err:
230 TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
231 return 0;
232 }
233
234 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
235 {
236 int i;
237
238 if (ctx->certs)
239 {
240 sk_X509_pop_free(ctx->certs, X509_free);
241 ctx->certs = NULL;
242 }
243 if (!certs) return 1;
244 if (!(ctx->certs = sk_X509_dup(certs)))
245 {
246 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
247 return 0;
248 }
249 for (i = 0; i < sk_X509_num(ctx->certs); ++i)
250 {
251 X509 *cert = sk_X509_value(ctx->certs, i);
252 CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509);
253 }
254
255 return 1;
256 }
257
258 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
259 {
260 ASN1_OBJECT *copy = NULL;
261
262 /* Create new policy stack if necessary. */
263 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null()))
264 goto err;
265 if (!(copy = OBJ_dup(policy))) goto err;
266 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) goto err;
267
268 return 1;
269 err:
270 TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
271 ASN1_OBJECT_free(copy);
272 return 0;
273 }
274
275 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
276 {
277 /* Create new md stack if necessary. */
278 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null()))
279 goto err;
280 /* Add the shared md, no copy needed. */
281 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) goto err;
282
283 return 1;
284 err:
285 TSerr(TS_F_TS_RESP_CTX_ADD_MD, 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,
298 int secs, int millis, int micros)
299 {
300
301 TS_RESP_CTX_accuracy_free(ctx);
302 if (secs && (!(ctx->seconds = ASN1_INTEGER_new())
303 || !ASN1_INTEGER_set(ctx->seconds, secs)))
304 goto err;
305 if (millis && (!(ctx->millis = ASN1_INTEGER_new())
306 || !ASN1_INTEGER_set(ctx->millis, millis)))
307 goto err;
308 if (micros && (!(ctx->micros = ASN1_INTEGER_new())
309 || !ASN1_INTEGER_set(ctx->micros, micros)))
310 goto err;
311
312 return 1;
313 err:
314 TS_RESP_CTX_accuracy_free(ctx);
315 TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
316 return 0;
317 }
318
319 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
320 {
321 ctx->flags |= flags;
322 }
323
324 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
325 {
326 ctx->serial_cb = cb;
327 ctx->serial_cb_data = data;
328 }
329
330 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
331 {
332 ctx->time_cb = cb;
333 ctx->time_cb_data = data;
334 }
335
336 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
337 TS_extension_cb cb, void *data)
338 {
339 ctx->extension_cb = cb;
340 ctx->extension_cb_data = data;
341 }
342
343 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
344 int status, const char *text)
345 {
346 TS_STATUS_INFO *si = NULL;
347 ASN1_UTF8STRING *utf8_text = NULL;
348 int ret = 0;
349
350 if (!(si = TS_STATUS_INFO_new())) goto err;
351 if (!ASN1_INTEGER_set(si->status, status)) goto err;
352 if (text)
353 {
354 if (!(utf8_text = ASN1_UTF8STRING_new())
355 || !ASN1_STRING_set(utf8_text, text, strlen(text)))
356 goto err;
357 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
358 goto err;
359 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) goto err;
360 utf8_text = NULL; /* Ownership is lost. */
361 }
362 if (!TS_RESP_set_status_info(ctx->response, si)) goto err;
363 ret = 1;
364 err:
365 if (!ret)
366 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, 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,
373 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 {
380 /* Status has not been set, set it now. */
381 ret = TS_RESP_CTX_set_status_info(ctx, status, text);
382 }
383 return ret;
384 }
385
386 int 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 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
390 goto err;
391 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
392 goto err;
393 return 1;
394 err:
395 TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
396 return 0;
397 }
398
399 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
400 {
401 return ctx->request;
402 }
403
404 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
405 {
406 return ctx->tst_info;
407 }
408
409 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision)
410 {
411 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
412 return 0;
413 ctx->clock_precision_digits = precision;
414 return 1;
415 }
416
417 /* Main entry method of the response generation. */
418 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
419 {
420 ASN1_OBJECT *policy;
421 TS_RESP *response;
422 int result = 0;
423
424 TS_RESP_CTX_init(ctx);
425
426 /* Creating the response object. */
427 if (!(ctx->response = TS_RESP_new()))
428 {
429 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
430 goto end;
431 }
432
433 /* Parsing DER request. */
434 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL)))
435 {
436 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
437 "Bad request format or "
438 "system error.");
439 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
440 goto end;
441 }
442
443 /* Setting default status info. */
444 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
445 goto end;
446
447 /* Checking the request format. */
448 if (!TS_RESP_check_request(ctx)) goto end;
449
450 /* Checking acceptable policies. */
451 if (!(policy = TS_RESP_get_policy(ctx))) goto end;
452
453 /* Creating the TS_TST_INFO object. */
454 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
455 goto end;
456
457 /* Processing extensions. */
458 if (!TS_RESP_process_extensions(ctx)) goto end;
459
460 /* Generating the signature. */
461 if (!TS_RESP_sign(ctx)) goto end;
462
463 /* Everything was successful. */
464 result = 1;
465 end:
466 if (!result)
467 {
468 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
469 if (ctx->response != NULL)
470 {
471 if (TS_RESP_CTX_set_status_info_cond(ctx,
472 TS_STATUS_REJECTION, "Error during response "
473 "generation.") == 0)
474 {
475 TS_RESP_free(ctx->response);
476 ctx->response = NULL;
477 }
478 }
479 }
480 response = ctx->response;
481 ctx->response = NULL; /* Ownership will be returned to caller. */
482 TS_RESP_CTX_cleanup(ctx);
483 return response;
484 }
485
486 /* Initializes the variable part of the context. */
487 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx)
488 {
489 ctx->request = NULL;
490 ctx->response = NULL;
491 ctx->tst_info = NULL;
492 }
493
494 /* Cleans up the variable part of the context. */
495 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
496 {
497 TS_REQ_free(ctx->request);
498 ctx->request = NULL;
499 TS_RESP_free(ctx->response);
500 ctx->response = NULL;
501 TS_TST_INFO_free(ctx->tst_info);
502 ctx->tst_info = NULL;
503 }
504
505 /* Checks the format and content of the request. */
506 static int TS_RESP_check_request(TS_RESP_CTX *ctx)
507 {
508 TS_REQ *request = ctx->request;
509 TS_MSG_IMPRINT *msg_imprint;
510 X509_ALGOR *md_alg;
511 int md_alg_id;
512 const ASN1_OCTET_STRING *digest;
513 EVP_MD *md = NULL;
514 int i;
515
516 /* Checking request version. */
517 if (TS_REQ_get_version(request) != 1)
518 {
519 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
520 "Bad request version.");
521 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
522 return 0;
523 }
524
525 /* Checking message digest algorithm. */
526 msg_imprint = TS_REQ_get_msg_imprint(request);
527 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
528 md_alg_id = OBJ_obj2nid(md_alg->algorithm);
529 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i)
530 {
531 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
532 if (md_alg_id == EVP_MD_type(current_md))
533 md = current_md;
534 }
535 if (!md)
536 {
537 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
538 "Message digest algorithm is "
539 "not supported.");
540 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
541 return 0;
542 }
543
544 /* No message digest takes parameter. */
545 if (md_alg->parameter
546 && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL)
547 {
548 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
549 "Superfluous message digest "
550 "parameter.");
551 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
552 return 0;
553 }
554 /* Checking message digest size. */
555 digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
556 if (digest->length != EVP_MD_size(md))
557 {
558 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
559 "Bad message digest.");
560 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
561 return 0;
562 }
563
564 return 1;
565 }
566
567 /* Returns the TSA policy based on the requested and acceptable policies. */
568 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx)
569 {
570 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
571 ASN1_OBJECT *policy = NULL;
572 int i;
573
574 if (ctx->default_policy == NULL)
575 {
576 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
577 return NULL;
578 }
579 /* Return the default policy if none is requested or the default is
580 requested. */
581 if (!requested || !OBJ_cmp(requested, ctx->default_policy))
582 policy = ctx->default_policy;
583
584 /* Check if the policy is acceptable. */
585 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i)
586 {
587 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
588 if (!OBJ_cmp(requested, current))
589 policy = current;
590 }
591 if (!policy)
592 {
593 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
594 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
595 "Requested policy is not "
596 "supported.");
597 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
598 }
599 return policy;
600 }
601
602 /* Creates the TS_TST_INFO object based on the settings of the context. */
603 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
604 ASN1_OBJECT *policy)
605 {
606 int result = 0;
607 TS_TST_INFO *tst_info = NULL;
608 ASN1_INTEGER *serial = NULL;
609 ASN1_GENERALIZEDTIME *asn1_time = NULL;
610 long sec, usec;
611 TS_ACCURACY *accuracy = NULL;
612 const ASN1_INTEGER *nonce;
613 GENERAL_NAME *tsa_name = NULL;
614
615 if (!(tst_info = TS_TST_INFO_new())) goto end;
616 if (!TS_TST_INFO_set_version(tst_info, 1)) goto end;
617 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) goto end;
618 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
619 goto end;
620 if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data))
621 || !TS_TST_INFO_set_serial(tst_info, serial))
622 goto end;
623 if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec)
624 || !(asn1_time = TS_RESP_set_genTime_with_precision(NULL,
625 sec, usec,
626 ctx->clock_precision_digits))
627 || !TS_TST_INFO_set_time(tst_info, asn1_time))
628 goto end;
629
630 /* Setting accuracy if needed. */
631 if ((ctx->seconds || ctx->millis || ctx->micros)
632 && !(accuracy = TS_ACCURACY_new()))
633 goto end;
634
635 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
636 goto end;
637 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
638 goto end;
639 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
640 goto end;
641 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
642 goto end;
643
644 /* Setting ordering. */
645 if ((ctx->flags & TS_ORDERING)
646 && !TS_TST_INFO_set_ordering(tst_info, 1))
647 goto end;
648
649 /* Setting nonce if needed. */
650 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL
651 && !TS_TST_INFO_set_nonce(tst_info, nonce))
652 goto end;
653
654 /* Setting TSA name to subject of signer certificate. */
655 if (ctx->flags & TS_TSA_NAME)
656 {
657 if (!(tsa_name = GENERAL_NAME_new())) goto end;
658 tsa_name->type = GEN_DIRNAME;
659 tsa_name->d.dirn =
660 X509_NAME_dup(ctx->signer_cert->cert_info->subject);
661 if (!tsa_name->d.dirn) goto end;
662 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) goto end;
663 }
664
665 result = 1;
666 end:
667 if (!result)
668 {
669 TS_TST_INFO_free(tst_info);
670 tst_info = NULL;
671 TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
672 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
673 "Error during TSTInfo "
674 "generation.");
675 }
676 GENERAL_NAME_free(tsa_name);
677 TS_ACCURACY_free(accuracy);
678 ASN1_GENERALIZEDTIME_free(asn1_time);
679 ASN1_INTEGER_free(serial);
680
681 return tst_info;
682 }
683
684 /* Processing the extensions of the request. */
685 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx)
686 {
687 STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
688 int i;
689 int ok = 1;
690
691 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i)
692 {
693 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
694 /* XXXXX The last argument was previously
695 (void *)ctx->extension_cb, but ISO C doesn't permit
696 converting a function pointer to void *. For lack of
697 better information, I'm placing a NULL there instead.
698 The callback can pick its own address out from the ctx
699 anyway...
700 */
701 ok = (*ctx->extension_cb)(ctx, ext, NULL);
702 }
703
704 return ok;
705 }
706
707 /* Functions for signing the TS_TST_INFO structure of the context. */
708 static int TS_RESP_sign(TS_RESP_CTX *ctx)
709 {
710 int ret = 0;
711 PKCS7 *p7 = NULL;
712 PKCS7_SIGNER_INFO *si;
713 STACK_OF(X509) *certs; /* Certificates to include in sc. */
714 ESS_SIGNING_CERT *sc = NULL;
715 ASN1_OBJECT *oid;
716 BIO *p7bio = NULL;
717 int i;
718
719 /* Check if signcert and pkey match. */
720 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
721 TSerr(TS_F_TS_RESP_SIGN,
722 TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
723 goto err;
724 }
725
726 /* Create a new PKCS7 signed object. */
727 if (!(p7 = PKCS7_new())) {
728 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
729 goto err;
730 }
731 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) goto err;
732
733 /* Force SignedData version to be 3 instead of the default 1. */
734 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) goto err;
735
736 /* Add signer certificate and optional certificate chain. */
737 if (TS_REQ_get_cert_req(ctx->request))
738 {
739 PKCS7_add_certificate(p7, ctx->signer_cert);
740 if (ctx->certs)
741 {
742 for(i = 0; i < sk_X509_num(ctx->certs); ++i)
743 {
744 X509 *cert = sk_X509_value(ctx->certs, i);
745 PKCS7_add_certificate(p7, cert);
746 }
747 }
748 }
749
750 /* Add a new signer info. */
751 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert,
752 ctx->signer_key, EVP_sha1())))
753 {
754 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
755 goto err;
756 }
757
758 /* Add content type signed attribute to the signer info. */
759 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
760 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
761 V_ASN1_OBJECT, oid))
762 {
763 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
764 goto err;
765 }
766
767 /* Create the ESS SigningCertificate attribute which contains
768 the signer certificate id and optionally the certificate chain. */
769 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
770 if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
771 goto err;
772
773 /* Add SigningCertificate signed attribute to the signer info. */
774 if (!ESS_add_signing_cert(si, sc))
775 {
776 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
777 goto err;
778 }
779
780 /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
781 if (!TS_TST_INFO_content_new(p7)) goto err;
782
783 /* Add the DER encoded tst_info to the PKCS7 structure. */
784 if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
785 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
786 goto err;
787 }
788
789 /* Convert tst_info to DER. */
790 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info))
791 {
792 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
793 goto err;
794 }
795
796 /* Create the signature and add it to the signer info. */
797 if (!PKCS7_dataFinal(p7, p7bio))
798 {
799 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
800 goto err;
801 }
802
803 /* Set new PKCS7 and TST_INFO objects. */
804 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
805 p7 = NULL; /* Ownership is lost. */
806 ctx->tst_info = NULL; /* Ownership is lost. */
807
808 ret = 1;
809 err:
810 if (!ret)
811 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
812 "Error during signature "
813 "generation.");
814 BIO_free_all(p7bio);
815 ESS_SIGNING_CERT_free(sc);
816 PKCS7_free(p7);
817 return ret;
818 }
819
820 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
821 STACK_OF(X509) *certs)
822 {
823 ESS_CERT_ID *cid;
824 ESS_SIGNING_CERT *sc = NULL;
825 int i;
826
827 /* Creating the ESS_CERT_ID stack. */
828 if (!(sc = ESS_SIGNING_CERT_new())) goto err;
829 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
830 goto err;
831
832 /* Adding the signing certificate id. */
833 if (!(cid = ESS_CERT_ID_new_init(signcert, 0))
834 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
835 goto err;
836 /* Adding the certificate chain ids. */
837 for (i = 0; i < sk_X509_num(certs); ++i)
838 {
839 X509 *cert = sk_X509_value(certs, i);
840 if (!(cid = ESS_CERT_ID_new_init(cert, 1))
841 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
842 goto err;
843 }
844
845 return sc;
846 err:
847 ESS_SIGNING_CERT_free(sc);
848 TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
849 return NULL;
850 }
851
852 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
853 {
854 ESS_CERT_ID *cid = NULL;
855 GENERAL_NAME *name = NULL;
856
857 /* Recompute SHA1 hash of certificate if necessary (side effect). */
858 X509_check_purpose(cert, -1, 0);
859
860 if (!(cid = ESS_CERT_ID_new())) goto err;
861 if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash,
862 sizeof(cert->sha1_hash)))
863 goto err;
864
865 /* Setting the issuer/serial if requested. */
866 if (issuer_needed)
867 {
868 /* Creating issuer/serial structure. */
869 if (!cid->issuer_serial
870 && !(cid->issuer_serial = ESS_ISSUER_SERIAL_new()))
871 goto err;
872 /* Creating general name from the certificate issuer. */
873 if (!(name = GENERAL_NAME_new())) goto err;
874 name->type = GEN_DIRNAME;
875 if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer)))
876 goto err;
877 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
878 goto err;
879 name = NULL; /* Ownership is lost. */
880 /* Setting the serial number. */
881 ASN1_INTEGER_free(cid->issuer_serial->serial);
882 if (!(cid->issuer_serial->serial =
883 ASN1_INTEGER_dup(cert->cert_info->serialNumber)))
884 goto err;
885 }
886
887 return cid;
888 err:
889 GENERAL_NAME_free(name);
890 ESS_CERT_ID_free(cid);
891 TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
892 return NULL;
893 }
894
895 static int TS_TST_INFO_content_new(PKCS7 *p7)
896 {
897 PKCS7 *ret = NULL;
898 ASN1_OCTET_STRING *octet_string = NULL;
899
900 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
901 if (!(ret = PKCS7_new())) goto err;
902 if (!(ret->d.other = ASN1_TYPE_new())) goto err;
903 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
904 if (!(octet_string = ASN1_OCTET_STRING_new())) 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)) goto err;
910
911 return 1;
912 err:
913 ASN1_OCTET_STRING_free(octet_string);
914 PKCS7_free(ret);
915 return 0;
916 }
917
918 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
919 {
920 ASN1_STRING *seq = NULL;
921 unsigned char *p, *pp = NULL;
922 int len;
923
924 len = i2d_ESS_SIGNING_CERT(sc, NULL);
925 if (!(pp = (unsigned char *) OPENSSL_malloc(len)))
926 {
927 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
928 goto err;
929 }
930 p = pp;
931 i2d_ESS_SIGNING_CERT(sc, &p);
932 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
933 {
934 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
935 goto err;
936 }
937 OPENSSL_free(pp); pp = NULL;
938 return PKCS7_add_signed_attribute(si,
939 NID_id_smime_aa_signingCertificate,
940 V_ASN1_SEQUENCE, seq);
941 err:
942 ASN1_STRING_free(seq);
943 OPENSSL_free(pp);
944
945 return 0;
946 }
947
948
949 static ASN1_GENERALIZEDTIME *
950 TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time,
951 long sec, long usec, unsigned precision)
952 {
953 time_t time_sec = (time_t) sec;
954 struct tm *tm = NULL;
955 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
956 char *p = genTime_str;
957 char *p_end = genTime_str + sizeof(genTime_str);
958
959 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
960 goto err;
961
962
963 if (!(tm = gmtime(&time_sec)))
964 goto err;
965
966 /*
967 * Put "genTime_str" in GeneralizedTime format. We work around the
968 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
969 * NOT include fractional seconds") and OpenSSL related functions to
970 * meet the rfc3161 requirement: "GeneralizedTime syntax can include
971 * fraction-of-second details".
972 */
973 p += BIO_snprintf(p, p_end - p,
974 "%04d%02d%02d%02d%02d%02d",
975 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
976 tm->tm_hour, tm->tm_min, tm->tm_sec);
977 if (precision > 0)
978 {
979 /* Add fraction of seconds (leave space for dot and null). */
980 BIO_snprintf(p, 2 + precision, ".%ld", usec);
981 /* We cannot use the snprintf return value,
982 because it might have been truncated. */
983 p += strlen(p);
984
985 /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides
986 the following restrictions for a DER-encoding, which OpenSSL
987 (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
988 support:
989 "The encoding MUST terminate with a "Z" (which means "Zulu"
990 time). The decimal point element, if present, MUST be the
991 point option ".". The fractional-seconds elements,
992 if present, MUST omit all trailing 0's;
993 if the elements correspond to 0, they MUST be wholly
994 omitted, and the decimal point element also MUST be
995 omitted." */
996 /* Remove trailing zeros. The dot guarantees the exit
997 condition of this loop even if all the digits are zero. */
998 while (*--p == '0')
999 /* empty */;
1000 /* p points to either the dot or the last non-zero digit. */
1001 if (*p != '.') ++p;
1002 }
1003 /* Add the trailing Z and the terminating null. */
1004 *p++ = 'Z';
1005 *p++ = '\0';
1006
1007 /* Now call OpenSSL to check and set our genTime value */
1008 if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new()))
1009 goto err;
1010 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str))
1011 {
1012 ASN1_GENERALIZEDTIME_free(asn1_time);
1013 goto err;
1014 }
1015
1016 return asn1_time;
1017 err:
1018 TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
1019 return NULL;
1020 }