1 /* crypto/ts/ts_resp_sign.c */
2 /*
3 * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
4 * 2002.
5 */
6 /* ====================================================================
7 * Copyright (c) 2006-2018 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60 #include "cryptlib.h"
61 #include "o_time.h"
62
63 #if defined(OPENSSL_SYS_UNIX)
64 # include <sys/time.h>
65 #endif
66
67 #include <openssl/objects.h>
68 #include <openssl/ts.h>
69 #include <openssl/pkcs7.h>
70
71 /* Private function declarations. */
72
73 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
74 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
75 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
76
77 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
78 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
79 static int TS_RESP_check_request(TS_RESP_CTX *ctx);
80 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
81 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
82 ASN1_OBJECT *policy);
83 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
84 static int TS_RESP_sign(TS_RESP_CTX *ctx);
85
86 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
87 STACK_OF(X509) *certs);
88 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
89 static int TS_TST_INFO_content_new(PKCS7 *p7);
90 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
91
92 static ASN1_GENERALIZEDTIME
93 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
94 unsigned);
95
96 /* Default callbacks for response generation. */
97
def_serial_cb(struct TS_resp_ctx * ctx,void * data)98 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
99 {
100 ASN1_INTEGER *serial = ASN1_INTEGER_new();
101 if (!serial)
102 goto err;
103 if (!ASN1_INTEGER_set(serial, 1))
104 goto err;
105 return serial;
106 err:
107 TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
108 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
109 "Error during serial number generation.");
110 return NULL;
111 }
112
113 #if defined(OPENSSL_SYS_UNIX)
114
115 /* Use the gettimeofday function call. */
def_time_cb(struct TS_resp_ctx * ctx,void * data,long * sec,long * usec)116 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
117 long *sec, long *usec)
118 {
119 struct timeval tv;
120 if (gettimeofday(&tv, NULL) != 0) {
121 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
122 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
123 "Time is not available.");
124 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
125 return 0;
126 }
127 /* Return time to caller. */
128 *sec = tv.tv_sec;
129 *usec = tv.tv_usec;
130
131 return 1;
132 }
133
134 #else
135
136 /* Use the time function call that provides only seconds precision. */
def_time_cb(struct TS_resp_ctx * ctx,void * data,long * sec,long * usec)137 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
138 long *sec, long *usec)
139 {
140 time_t t;
141 if (time(&t) == (time_t)-1) {
142 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
143 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
144 "Time is not available.");
145 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
146 return 0;
147 }
148 /* Return time to caller, only second precision. */
149 *sec = (long)t;
150 *usec = 0;
151
152 return 1;
153 }
154
155 #endif
156
def_extension_cb(struct TS_resp_ctx * ctx,X509_EXTENSION * ext,void * data)157 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
158 void *data)
159 {
160 /* No extensions are processed here. */
161 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
162 "Unsupported extension.");
163 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
164 return 0;
165 }
166
167 /* TS_RESP_CTX management functions. */
168
TS_RESP_CTX_new()169 TS_RESP_CTX *TS_RESP_CTX_new()
170 {
171 TS_RESP_CTX *ctx;
172
173 if (!(ctx = (TS_RESP_CTX *)OPENSSL_malloc(sizeof(TS_RESP_CTX)))) {
174 TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
175 return NULL;
176 }
177 memset(ctx, 0, sizeof(TS_RESP_CTX));
178
179 /* Setting default callbacks. */
180 ctx->serial_cb = def_serial_cb;
181 ctx->time_cb = def_time_cb;
182 ctx->extension_cb = def_extension_cb;
183
184 return ctx;
185 }
186
TS_RESP_CTX_free(TS_RESP_CTX * ctx)187 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
188 {
189 if (!ctx)
190 return;
191
192 X509_free(ctx->signer_cert);
193 EVP_PKEY_free(ctx->signer_key);
194 sk_X509_pop_free(ctx->certs, X509_free);
195 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
196 ASN1_OBJECT_free(ctx->default_policy);
197 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */
198 ASN1_INTEGER_free(ctx->seconds);
199 ASN1_INTEGER_free(ctx->millis);
200 ASN1_INTEGER_free(ctx->micros);
201 OPENSSL_free(ctx);
202 }
203
TS_RESP_CTX_set_signer_cert(TS_RESP_CTX * ctx,X509 * signer)204 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
205 {
206 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
207 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
208 TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
209 return 0;
210 }
211 if (ctx->signer_cert)
212 X509_free(ctx->signer_cert);
213 ctx->signer_cert = signer;
214 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
215 return 1;
216 }
217
TS_RESP_CTX_set_signer_key(TS_RESP_CTX * ctx,EVP_PKEY * key)218 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
219 {
220 if (ctx->signer_key)
221 EVP_PKEY_free(ctx->signer_key);
222 ctx->signer_key = key;
223 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
224
225 return 1;
226 }
227
TS_RESP_CTX_set_def_policy(TS_RESP_CTX * ctx,ASN1_OBJECT * def_policy)228 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
229 {
230 if (ctx->default_policy)
231 ASN1_OBJECT_free(ctx->default_policy);
232 if (!(ctx->default_policy = OBJ_dup(def_policy)))
233 goto err;
234 return 1;
235 err:
236 TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
237 return 0;
238 }
239
TS_RESP_CTX_set_certs(TS_RESP_CTX * ctx,STACK_OF (X509)* certs)240 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
241 {
242
243 if (ctx->certs) {
244 sk_X509_pop_free(ctx->certs, X509_free);
245 ctx->certs = NULL;
246 }
247 if (!certs)
248 return 1;
249 if (!(ctx->certs = X509_chain_up_ref(certs))) {
250 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
251 return 0;
252 }
253
254 return 1;
255 }
256
TS_RESP_CTX_add_policy(TS_RESP_CTX * ctx,ASN1_OBJECT * policy)257 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
258 {
259 ASN1_OBJECT *copy = NULL;
260
261 /* Create new policy stack if necessary. */
262 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null()))
263 goto err;
264 if (!(copy = OBJ_dup(policy)))
265 goto err;
266 if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
267 goto err;
268
269 return 1;
270 err:
271 TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
272 ASN1_OBJECT_free(copy);
273 return 0;
274 }
275
TS_RESP_CTX_add_md(TS_RESP_CTX * ctx,const EVP_MD * md)276 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
277 {
278 /* Create new md stack if necessary. */
279 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null()))
280 goto err;
281 /* Add the shared md, no copy needed. */
282 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md))
283 goto err;
284
285 return 1;
286 err:
287 TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
288 return 0;
289 }
290
291 #define TS_RESP_CTX_accuracy_free(ctx) \
292 ASN1_INTEGER_free(ctx->seconds); \
293 ctx->seconds = NULL; \
294 ASN1_INTEGER_free(ctx->millis); \
295 ctx->millis = NULL; \
296 ASN1_INTEGER_free(ctx->micros); \
297 ctx->micros = NULL;
298
TS_RESP_CTX_set_accuracy(TS_RESP_CTX * ctx,int secs,int millis,int micros)299 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
300 int secs, int millis, int micros)
301 {
302
303 TS_RESP_CTX_accuracy_free(ctx);
304 if (secs && (!(ctx->seconds = ASN1_INTEGER_new())
305 || !ASN1_INTEGER_set(ctx->seconds, secs)))
306 goto err;
307 if (millis && (!(ctx->millis = ASN1_INTEGER_new())
308 || !ASN1_INTEGER_set(ctx->millis, millis)))
309 goto err;
310 if (micros && (!(ctx->micros = ASN1_INTEGER_new())
311 || !ASN1_INTEGER_set(ctx->micros, micros)))
312 goto err;
313
314 return 1;
315 err:
316 TS_RESP_CTX_accuracy_free(ctx);
317 TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
318 return 0;
319 }
320
TS_RESP_CTX_add_flags(TS_RESP_CTX * ctx,int flags)321 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
322 {
323 ctx->flags |= flags;
324 }
325
TS_RESP_CTX_set_serial_cb(TS_RESP_CTX * ctx,TS_serial_cb cb,void * data)326 void 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
TS_RESP_CTX_set_time_cb(TS_RESP_CTX * ctx,TS_time_cb cb,void * data)332 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
333 {
334 ctx->time_cb = cb;
335 ctx->time_cb_data = data;
336 }
337
TS_RESP_CTX_set_extension_cb(TS_RESP_CTX * ctx,TS_extension_cb cb,void * data)338 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
339 TS_extension_cb cb, void *data)
340 {
341 ctx->extension_cb = cb;
342 ctx->extension_cb_data = data;
343 }
344
TS_RESP_CTX_set_status_info(TS_RESP_CTX * ctx,int status,const char * text)345 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
346 int status, const char *text)
347 {
348 TS_STATUS_INFO *si = NULL;
349 ASN1_UTF8STRING *utf8_text = NULL;
350 int ret = 0;
351
352 if (!(si = TS_STATUS_INFO_new()))
353 goto err;
354 if (!ASN1_INTEGER_set(si->status, status))
355 goto err;
356 if (text) {
357 if (!(utf8_text = ASN1_UTF8STRING_new())
358 || !ASN1_STRING_set(utf8_text, text, strlen(text)))
359 goto err;
360 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
361 goto err;
362 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
363 goto err;
364 utf8_text = NULL; /* Ownership is lost. */
365 }
366 if (!TS_RESP_set_status_info(ctx->response, si))
367 goto err;
368 ret = 1;
369 err:
370 if (!ret)
371 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
372 TS_STATUS_INFO_free(si);
373 ASN1_UTF8STRING_free(utf8_text);
374 return ret;
375 }
376
TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX * ctx,int status,const char * text)377 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
378 int status, const char *text)
379 {
380 int ret = 1;
381 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
382
383 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
384 /* Status has not been set, set it now. */
385 ret = TS_RESP_CTX_set_status_info(ctx, status, text);
386 }
387 return ret;
388 }
389
TS_RESP_CTX_add_failure_info(TS_RESP_CTX * ctx,int failure)390 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
391 {
392 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
393 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
394 goto err;
395 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
396 goto err;
397 return 1;
398 err:
399 TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
400 return 0;
401 }
402
TS_RESP_CTX_get_request(TS_RESP_CTX * ctx)403 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
404 {
405 return ctx->request;
406 }
407
TS_RESP_CTX_get_tst_info(TS_RESP_CTX * ctx)408 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
409 {
410 return ctx->tst_info;
411 }
412
TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX * ctx,unsigned precision)413 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
414 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. */
TS_RESP_create_response(TS_RESP_CTX * ctx,BIO * req_bio)423 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
424 {
425 ASN1_OBJECT *policy;
426 TS_RESP *response;
427 int result = 0;
428
429 TS_RESP_CTX_init(ctx);
430
431 /* Creating the response object. */
432 if (!(ctx->response = TS_RESP_new())) {
433 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
434 goto end;
435 }
436
437 /* Parsing DER request. */
438 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) {
439 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
440 "Bad request format or " "system error.");
441 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
442 goto end;
443 }
444
445 /* Setting default status info. */
446 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
447 goto end;
448
449 /* Checking the request format. */
450 if (!TS_RESP_check_request(ctx))
451 goto end;
452
453 /* Checking acceptable policies. */
454 if (!(policy = TS_RESP_get_policy(ctx)))
455 goto end;
456
457 /* Creating the TS_TST_INFO object. */
458 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
459 goto end;
460
461 /* Processing extensions. */
462 if (!TS_RESP_process_extensions(ctx))
463 goto end;
464
465 /* Generating the signature. */
466 if (!TS_RESP_sign(ctx))
467 goto end;
468
469 /* Everything was successful. */
470 result = 1;
471 end:
472 if (!result) {
473 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
474 if (ctx->response != NULL) {
475 if (TS_RESP_CTX_set_status_info_cond(ctx,
476 TS_STATUS_REJECTION,
477 "Error during response "
478 "generation.") == 0) {
479 TS_RESP_free(ctx->response);
480 ctx->response = NULL;
481 }
482 }
483 }
484 response = ctx->response;
485 ctx->response = NULL; /* Ownership will be returned to caller. */
486 TS_RESP_CTX_cleanup(ctx);
487 return response;
488 }
489
490 /* Initializes the variable part of the context. */
TS_RESP_CTX_init(TS_RESP_CTX * ctx)491 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx)
492 {
493 ctx->request = NULL;
494 ctx->response = NULL;
495 ctx->tst_info = NULL;
496 }
497
498 /* Cleans up the variable part of the context. */
TS_RESP_CTX_cleanup(TS_RESP_CTX * ctx)499 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
500 {
501 TS_REQ_free(ctx->request);
502 ctx->request = NULL;
503 TS_RESP_free(ctx->response);
504 ctx->response = NULL;
505 TS_TST_INFO_free(ctx->tst_info);
506 ctx->tst_info = NULL;
507 }
508
509 /* Checks the format and content of the request. */
TS_RESP_check_request(TS_RESP_CTX * ctx)510 static int TS_RESP_check_request(TS_RESP_CTX *ctx)
511 {
512 TS_REQ *request = ctx->request;
513 TS_MSG_IMPRINT *msg_imprint;
514 X509_ALGOR *md_alg;
515 int md_alg_id;
516 const ASN1_OCTET_STRING *digest;
517 EVP_MD *md = NULL;
518 int i;
519
520 /* Checking request version. */
521 if (TS_REQ_get_version(request) != 1) {
522 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
523 "Bad request version.");
524 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
525 return 0;
526 }
527
528 /* Checking message digest algorithm. */
529 msg_imprint = TS_REQ_get_msg_imprint(request);
530 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
531 md_alg_id = OBJ_obj2nid(md_alg->algorithm);
532 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
533 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
534 if (md_alg_id == EVP_MD_type(current_md))
535 md = current_md;
536 }
537 if (!md) {
538 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
539 "Message digest algorithm is "
540 "not supported.");
541 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
542 return 0;
543 }
544
545 /* No message digest takes parameter. */
546 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
547 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
548 "Superfluous message digest "
549 "parameter.");
550 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
551 return 0;
552 }
553 /* Checking message digest size. */
554 digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
555 if (digest->length != EVP_MD_size(md)) {
556 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
557 "Bad message digest.");
558 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
559 return 0;
560 }
561
562 return 1;
563 }
564
565 /* Returns the TSA policy based on the requested and acceptable policies. */
TS_RESP_get_policy(TS_RESP_CTX * ctx)566 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx)
567 {
568 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
569 ASN1_OBJECT *policy = NULL;
570 int i;
571
572 if (ctx->default_policy == NULL) {
573 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
574 return NULL;
575 }
576 /*
577 * Return the default policy if none is requested or the default is
578 * requested.
579 */
580 if (!requested || !OBJ_cmp(requested, ctx->default_policy))
581 policy = ctx->default_policy;
582
583 /* Check if the policy is acceptable. */
584 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
585 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
586 if (!OBJ_cmp(requested, current))
587 policy = current;
588 }
589 if (!policy) {
590 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
591 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
592 "Requested policy is not " "supported.");
593 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
594 }
595 return policy;
596 }
597
598 /* Creates the TS_TST_INFO object based on the settings of the context. */
TS_RESP_create_tst_info(TS_RESP_CTX * ctx,ASN1_OBJECT * policy)599 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
600 ASN1_OBJECT *policy)
601 {
602 int result = 0;
603 TS_TST_INFO *tst_info = NULL;
604 ASN1_INTEGER *serial = NULL;
605 ASN1_GENERALIZEDTIME *asn1_time = NULL;
606 long sec, usec;
607 TS_ACCURACY *accuracy = NULL;
608 const ASN1_INTEGER *nonce;
609 GENERAL_NAME *tsa_name = NULL;
610
611 if (!(tst_info = TS_TST_INFO_new()))
612 goto end;
613 if (!TS_TST_INFO_set_version(tst_info, 1))
614 goto end;
615 if (!TS_TST_INFO_set_policy_id(tst_info, policy))
616 goto end;
617 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
618 goto end;
619 if (!(serial = (*ctx->serial_cb) (ctx, ctx->serial_cb_data))
620 || !TS_TST_INFO_set_serial(tst_info, serial))
621 goto end;
622 if (!(*ctx->time_cb) (ctx, ctx->time_cb_data, &sec, &usec)
623 || !(asn1_time = TS_RESP_set_genTime_with_precision(NULL,
624 sec, usec,
625 ctx->clock_precision_digits))
626 || !TS_TST_INFO_set_time(tst_info, asn1_time))
627 goto end;
628
629 /* Setting accuracy if needed. */
630 if ((ctx->seconds || ctx->millis || ctx->micros)
631 && !(accuracy = TS_ACCURACY_new()))
632 goto end;
633
634 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
635 goto end;
636 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
637 goto end;
638 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
639 goto end;
640 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
641 goto end;
642
643 /* Setting ordering. */
644 if ((ctx->flags & TS_ORDERING)
645 && !TS_TST_INFO_set_ordering(tst_info, 1))
646 goto end;
647
648 /* Setting nonce if needed. */
649 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL
650 && !TS_TST_INFO_set_nonce(tst_info, nonce))
651 goto end;
652
653 /* Setting TSA name to subject of signer certificate. */
654 if (ctx->flags & TS_TSA_NAME) {
655 if (!(tsa_name = GENERAL_NAME_new()))
656 goto end;
657 tsa_name->type = GEN_DIRNAME;
658 tsa_name->d.dirn =
659 X509_NAME_dup(ctx->signer_cert->cert_info->subject);
660 if (!tsa_name->d.dirn)
661 goto end;
662 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
663 goto end;
664 }
665
666 result = 1;
667 end:
668 if (!result) {
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. */
TS_RESP_process_extensions(TS_RESP_CTX * ctx)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 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
693 /*
694 * XXXXX The last argument was previously (void *)ctx->extension_cb,
695 * but ISO C doesn't permit converting a function pointer to void *.
696 * For lack of better information, I'm placing a NULL there instead.
697 * The callback can pick its own address out from the ctx anyway...
698 */
699 ok = (*ctx->extension_cb) (ctx, ext, NULL);
700 }
701
702 return ok;
703 }
704
705 /* Functions for signing the TS_TST_INFO structure of the context. */
TS_RESP_sign(TS_RESP_CTX * ctx)706 static int TS_RESP_sign(TS_RESP_CTX *ctx)
707 {
708 int ret = 0;
709 PKCS7 *p7 = NULL;
710 PKCS7_SIGNER_INFO *si;
711 STACK_OF(X509) *certs; /* Certificates to include in sc. */
712 ESS_SIGNING_CERT *sc = NULL;
713 ASN1_OBJECT *oid;
714 BIO *p7bio = NULL;
715 int i;
716
717 /* Check if signcert and pkey match. */
718 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
719 TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
720 goto err;
721 }
722
723 /* Create a new PKCS7 signed object. */
724 if (!(p7 = PKCS7_new())) {
725 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
726 goto err;
727 }
728 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
729 goto err;
730
731 /* Force SignedData version to be 3 instead of the default 1. */
732 if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
733 goto err;
734
735 /* Add signer certificate and optional certificate chain. */
736 if (TS_REQ_get_cert_req(ctx->request)) {
737 PKCS7_add_certificate(p7, ctx->signer_cert);
738 if (ctx->certs) {
739 for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
740 X509 *cert = sk_X509_value(ctx->certs, i);
741 PKCS7_add_certificate(p7, cert);
742 }
743 }
744 }
745
746 /* Add a new signer info. */
747 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert,
748 ctx->signer_key, EVP_sha1()))) {
749 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
750 goto err;
751 }
752
753 /* Add content type signed attribute to the signer info. */
754 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
755 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
756 V_ASN1_OBJECT, oid)) {
757 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
758 goto err;
759 }
760
761 /*
762 * Create the ESS SigningCertificate attribute which contains the signer
763 * certificate id and optionally the certificate chain.
764 */
765 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
766 if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
767 goto err;
768
769 /* Add SigningCertificate signed attribute to the signer info. */
770 if (!ESS_add_signing_cert(si, sc)) {
771 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
772 goto err;
773 }
774
775 /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
776 if (!TS_TST_INFO_content_new(p7))
777 goto err;
778
779 /* Add the DER encoded tst_info to the PKCS7 structure. */
780 if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
781 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
782 goto err;
783 }
784
785 /* Convert tst_info to DER. */
786 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
787 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
788 goto err;
789 }
790
791 /* Create the signature and add it to the signer info. */
792 if (!PKCS7_dataFinal(p7, p7bio)) {
793 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
794 goto err;
795 }
796
797 /* Set new PKCS7 and TST_INFO objects. */
798 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
799 p7 = NULL; /* Ownership is lost. */
800 ctx->tst_info = NULL; /* Ownership is lost. */
801
802 ret = 1;
803 err:
804 if (!ret)
805 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
806 "Error during signature "
807 "generation.");
808 BIO_free_all(p7bio);
809 ESS_SIGNING_CERT_free(sc);
810 PKCS7_free(p7);
811 return ret;
812 }
813
ESS_SIGNING_CERT_new_init(X509 * signcert,STACK_OF (X509)* certs)814 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
815 STACK_OF(X509) *certs)
816 {
817 ESS_CERT_ID *cid;
818 ESS_SIGNING_CERT *sc = NULL;
819 int i;
820
821 /* Creating the ESS_CERT_ID stack. */
822 if (!(sc = ESS_SIGNING_CERT_new()))
823 goto err;
824 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
825 goto err;
826
827 /* Adding the signing certificate id. */
828 if (!(cid = ESS_CERT_ID_new_init(signcert, 0))
829 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
830 goto err;
831 /* Adding the certificate chain ids. */
832 for (i = 0; i < sk_X509_num(certs); ++i) {
833 X509 *cert = sk_X509_value(certs, i);
834 if (!(cid = ESS_CERT_ID_new_init(cert, 1))
835 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
836 goto err;
837 }
838
839 return sc;
840 err:
841 ESS_SIGNING_CERT_free(sc);
842 TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
843 return NULL;
844 }
845
ESS_CERT_ID_new_init(X509 * cert,int issuer_needed)846 static ESS_CERT_ID *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 err:
884 GENERAL_NAME_free(name);
885 ESS_CERT_ID_free(cid);
886 TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
887 return NULL;
888 }
889
TS_TST_INFO_content_new(PKCS7 * p7)890 static int TS_TST_INFO_content_new(PKCS7 *p7)
891 {
892 PKCS7 *ret = NULL;
893 ASN1_OCTET_STRING *octet_string = NULL;
894
895 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
896 if (!(ret = PKCS7_new()))
897 goto err;
898 if (!(ret->d.other = ASN1_TYPE_new()))
899 goto err;
900 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
901 if (!(octet_string = ASN1_OCTET_STRING_new()))
902 goto err;
903 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
904 octet_string = NULL;
905
906 /* Add encapsulated content to signed PKCS7 structure. */
907 if (!PKCS7_set_content(p7, ret))
908 goto err;
909
910 return 1;
911 err:
912 ASN1_OCTET_STRING_free(octet_string);
913 PKCS7_free(ret);
914 return 0;
915 }
916
ESS_add_signing_cert(PKCS7_SIGNER_INFO * si,ESS_SIGNING_CERT * sc)917 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
918 {
919 ASN1_STRING *seq = NULL;
920 unsigned char *p, *pp = NULL;
921 int len;
922
923 len = i2d_ESS_SIGNING_CERT(sc, NULL);
924 if (!(pp = (unsigned char *)OPENSSL_malloc(len))) {
925 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
926 goto err;
927 }
928 p = pp;
929 i2d_ESS_SIGNING_CERT(sc, &p);
930 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
931 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
932 goto err;
933 }
934 OPENSSL_free(pp);
935 pp = NULL;
936 return PKCS7_add_signed_attribute(si,
937 NID_id_smime_aa_signingCertificate,
938 V_ASN1_SEQUENCE, seq);
939 err:
940 ASN1_STRING_free(seq);
941 OPENSSL_free(pp);
942
943 return 0;
944 }
945
946 static ASN1_GENERALIZEDTIME
TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME * asn1_time,long sec,long usec,unsigned precision)947 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time,
948 long sec, long usec, unsigned precision)
949 {
950 time_t time_sec = (time_t)sec;
951 struct tm *tm = NULL;
952 struct tm result = {0};
953 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
954 char *p = genTime_str;
955 char *p_end = genTime_str + sizeof(genTime_str);
956
957 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
958 goto err;
959
960 if (!(tm = OPENSSL_gmtime(&time_sec, &result)))
961 goto err;
962
963 /*
964 * Put "genTime_str" in GeneralizedTime format. We work around the
965 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
966 * NOT include fractional seconds") and OpenSSL related functions to
967 * meet the rfc3161 requirement: "GeneralizedTime syntax can include
968 * fraction-of-second details".
969 */
970 p += BIO_snprintf(p, p_end - p,
971 "%04d%02d%02d%02d%02d%02d",
972 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
973 tm->tm_hour, tm->tm_min, tm->tm_sec);
974 if (precision > 0) {
975 /* Add fraction of seconds (leave space for dot and null). */
976 BIO_snprintf(p, 2 + precision, ".%06ld", usec);
977 /*
978 * We cannot use the snprintf return value, because it might have
979 * been truncated.
980 */
981 p += strlen(p);
982
983 /*
984 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
985 * following restrictions for a DER-encoding, which OpenSSL
986 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
987 * support: "The encoding MUST terminate with a "Z" (which means
988 * "Zulu" time). The decimal point element, if present, MUST be the
989 * point option ".". The fractional-seconds elements, if present,
990 * MUST omit all trailing 0's; if the elements correspond to 0, they
991 * MUST be wholly omitted, and the decimal point element also MUST be
992 * omitted."
993 */
994 /*
995 * Remove trailing zeros. The dot guarantees the exit condition of
996 * this loop even if all the digits are zero.
997 */
998 while (*--p == '0')
999 /*
1000 * empty
1001 */ ;
1002 /* p points to either the dot or the last non-zero digit. */
1003 if (*p != '.')
1004 ++p;
1005 }
1006 /* Add the trailing Z and the terminating null. */
1007 *p++ = 'Z';
1008 *p++ = '\0';
1009
1010 /* Now call OpenSSL to check and set our genTime value */
1011 if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new()))
1012 goto err;
1013 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
1014 ASN1_GENERALIZEDTIME_free(asn1_time);
1015 goto err;
1016 }
1017
1018 return asn1_time;
1019 err:
1020 TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
1021 return NULL;
1022 }
1023