GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/ts/ts_rsp_sign.c Lines: 228 394 57.9 %
Date: 2017-11-13 Branches: 111 309 35.9 %

Line Branch Exec Source
1
/* $OpenBSD: ts_rsp_sign.c,v 1.21 2017/01/29 17:49:23 beck 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 *
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
114
def_time_cb(struct TS_resp_ctx *ctx, void *data, time_t *sec, long *usec)
115
{
116
4
	struct timeval tv;
117
118
2
	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
2
	*sec = tv.tv_sec;
127
2
	*usec = tv.tv_usec;
128
129
2
	return 1;
130
2
}
131
132
static int
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 *
145
TS_RESP_CTX_new(void)
146
{
147
	TS_RESP_CTX *ctx;
148
149
4
	if (!(ctx = calloc(1, sizeof(TS_RESP_CTX)))) {
150
		TSerror(ERR_R_MALLOC_FAILURE);
151
		return NULL;
152
	}
153
154
	/* Setting default callbacks. */
155
2
	ctx->serial_cb = def_serial_cb;
156
2
	ctx->time_cb = def_time_cb;
157
2
	ctx->extension_cb = def_extension_cb;
158
159
2
	return ctx;
160
2
}
161
162
void
163
TS_RESP_CTX_free(TS_RESP_CTX *ctx)
164
{
165
4
	if (!ctx)
166
		return;
167
168
2
	X509_free(ctx->signer_cert);
169
2
	EVP_PKEY_free(ctx->signer_key);
170
2
	sk_X509_pop_free(ctx->certs, X509_free);
171
2
	sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
172
2
	ASN1_OBJECT_free(ctx->default_policy);
173
2
	sk_EVP_MD_free(ctx->mds);	/* No EVP_MD_free method exists. */
174
2
	ASN1_INTEGER_free(ctx->seconds);
175
2
	ASN1_INTEGER_free(ctx->millis);
176
2
	ASN1_INTEGER_free(ctx->micros);
177
2
	free(ctx);
178
4
}
179
180
int
181
TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
182
{
183
4
	if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
184
		TSerror(TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
185
		return 0;
186
	}
187
2
	X509_free(ctx->signer_cert);
188
2
	ctx->signer_cert = signer;
189
2
	CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
190
2
	return 1;
191
2
}
192
193
int
194
TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
195
{
196
4
	EVP_PKEY_free(ctx->signer_key);
197
2
	ctx->signer_key = key;
198
2
	CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
199
200
2
	return 1;
201
}
202
203
int
204
TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
205
{
206
4
	if (ctx->default_policy)
207
		ASN1_OBJECT_free(ctx->default_policy);
208
2
	if (!(ctx->default_policy = OBJ_dup(def_policy)))
209
		goto err;
210
2
	return 1;
211
212
err:
213
	TSerror(ERR_R_MALLOC_FAILURE);
214
	return 0;
215
2
}
216
217
int
218
TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
219
{
220
	int i;
221
222
4
	if (ctx->certs) {
223
		sk_X509_pop_free(ctx->certs, X509_free);
224
		ctx->certs = NULL;
225
	}
226
2
	if (!certs)
227
		return 1;
228
2
	if (!(ctx->certs = sk_X509_dup(certs))) {
229
		TSerror(ERR_R_MALLOC_FAILURE);
230
		return 0;
231
	}
232
8
	for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
233
2
		X509 *cert = sk_X509_value(ctx->certs, i);
234
2
		CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509);
235
	}
236
237
2
	return 1;
238
2
}
239
240
int
241
TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
242
{
243
	ASN1_OBJECT *copy = NULL;
244
245
	/* Create new policy stack if necessary. */
246

10
	if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null()))
247
		goto err;
248
4
	if (!(copy = OBJ_dup(policy)))
249
		goto err;
250
4
	if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
251
		goto err;
252
253
4
	return 1;
254
255
err:
256
	TSerror(ERR_R_MALLOC_FAILURE);
257
	ASN1_OBJECT_free(copy);
258
	return 0;
259
4
}
260
261
int
262
TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
263
{
264
	/* Create new md stack if necessary. */
265

18
	if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null()))
266
		goto err;
267
	/* Add the shared md, no copy needed. */
268
8
	if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md))
269
		goto err;
270
271
8
	return 1;
272
273
err:
274
	TSerror(ERR_R_MALLOC_FAILURE);
275
	return 0;
276
8
}
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
287
TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, int secs, int millis, int micros)
288
{
289
4
	TS_RESP_CTX_accuracy_free(ctx);
290

2
	if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) ||
291
	    !ASN1_INTEGER_set(ctx->seconds, secs)))
292
		goto err;
293

2
	if (millis && (!(ctx->millis = ASN1_INTEGER_new()) ||
294
	    !ASN1_INTEGER_set(ctx->millis, millis)))
295
		goto err;
296

2
	if (micros && (!(ctx->micros = ASN1_INTEGER_new()) ||
297
	    !ASN1_INTEGER_set(ctx->micros, micros)))
298
		goto err;
299
300
2
	return 1;
301
302
err:
303
	TS_RESP_CTX_accuracy_free(ctx);
304
	TSerror(ERR_R_MALLOC_FAILURE);
305
	return 0;
306
2
}
307
308
void
309
TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
310
{
311
	ctx->flags |= flags;
312
}
313
314
void
315
TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
316
{
317
4
	ctx->serial_cb = cb;
318
2
	ctx->serial_cb_data = data;
319
2
}
320
321
void
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
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
4
	if (!(si = TS_STATUS_INFO_new()))
336
		goto err;
337
2
	if (!ASN1_INTEGER_set(si->status, status))
338
		goto err;
339
2
	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
2
	if (!TS_RESP_set_status_info(ctx->response, si))
350
		goto err;
351
2
	ret = 1;
352
353
err:
354
2
	if (!ret)
355
		TSerror(ERR_R_MALLOC_FAILURE);
356
2
	TS_STATUS_INFO_free(si);
357
2
	ASN1_UTF8STRING_free(utf8_text);
358
2
	return ret;
359
}
360
361
int
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
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 *
391
TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
392
{
393
	return ctx->request;
394
}
395
396
TS_TST_INFO *
397
TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
398
{
399
	return ctx->tst_info;
400
}
401
402
int
403
TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision)
404
{
405
4
	if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
406
		return 0;
407
2
	ctx->clock_precision_digits = precision;
408
2
	return 1;
409
2
}
410
411
/* Main entry method of the response generation. */
412
TS_RESP *
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
4
	TS_RESP_CTX_init(ctx);
420
421
	/* Creating the response object. */
422
2
	if (!(ctx->response = TS_RESP_new())) {
423
		TSerror(ERR_R_MALLOC_FAILURE);
424
		goto end;
425
	}
426
427
	/* Parsing DER request. */
428
2
	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
2
	if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
438
		goto end;
439
440
	/* Checking the request format. */
441
2
	if (!TS_RESP_check_request(ctx))
442
		goto end;
443
444
	/* Checking acceptable policies. */
445
2
	if (!(policy = TS_RESP_get_policy(ctx)))
446
		goto end;
447
448
	/* Creating the TS_TST_INFO object. */
449
2
	if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
450
		goto end;
451
452
	/* Processing extensions. */
453
2
	if (!TS_RESP_process_extensions(ctx))
454
		goto end;
455
456
	/* Generating the signature. */
457
2
	if (!TS_RESP_sign(ctx))
458
		goto end;
459
460
	/* Everything was successful. */
461
2
	result = 1;
462
463
end:
464
2
	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
2
	response = ctx->response;
476
2
	ctx->response = NULL;	/* Ownership will be returned to caller. */
477
2
	TS_RESP_CTX_cleanup(ctx);
478
2
	return response;
479
}
480
481
/* Initializes the variable part of the context. */
482
static void
483
TS_RESP_CTX_init(TS_RESP_CTX *ctx)
484
{
485
4
	ctx->request = NULL;
486
2
	ctx->response = NULL;
487
2
	ctx->tst_info = NULL;
488
2
}
489
490
/* Cleans up the variable part of the context. */
491
static void
492
TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
493
{
494
4
	TS_REQ_free(ctx->request);
495
2
	ctx->request = NULL;
496
2
	TS_RESP_free(ctx->response);
497
2
	ctx->response = NULL;
498
2
	TS_TST_INFO_free(ctx->tst_info);
499
2
	ctx->tst_info = NULL;
500
2
}
501
502
/* Checks the format and content of the request. */
503
static int
504
TS_RESP_check_request(TS_RESP_CTX *ctx)
505
{
506
4
	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
2
	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
2
	msg_imprint = TS_REQ_get_msg_imprint(request);
524
2
	md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
525
2
	md_alg_id = OBJ_obj2nid(md_alg->algorithm);
526

10
	for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
527
2
		EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
528
2
		if (md_alg_id == EVP_MD_type(current_md))
529
2
			md = current_md;
530
	}
531
2
	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

4
	if (md_alg->parameter &&
541
2
	    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
2
	digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
550
2
	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
2
	return 1;
558
2
}
559
560
/* Returns the TSA policy based on the requested and acceptable policies. */
561
static ASN1_OBJECT *
562
TS_RESP_get_policy(TS_RESP_CTX *ctx)
563
{
564
4
	ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
565
	ASN1_OBJECT *policy = NULL;
566
	int i;
567
568
2
	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

2
	if (!requested || !OBJ_cmp(requested, ctx->default_policy))
575
2
		policy = ctx->default_policy;
576
577
	/* Check if the policy is acceptable. */
578

4
	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
2
	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
2
	return policy;
591
2
}
592
593
/* Creates the TS_TST_INFO object based on the settings of the context. */
594
static TS_TST_INFO *
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
4
	time_t sec;
602
2
	long usec;
603
	TS_ACCURACY *accuracy = NULL;
604
	const ASN1_INTEGER *nonce;
605
	GENERAL_NAME *tsa_name = NULL;
606
607
2
	if (!(tst_info = TS_TST_INFO_new()))
608
		goto end;
609
2
	if (!TS_TST_INFO_set_version(tst_info, 1))
610
		goto end;
611
2
	if (!TS_TST_INFO_set_policy_id(tst_info, policy))
612
		goto end;
613
2
	if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
614
		goto end;
615

4
	if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data)) ||
616
2
	    !TS_TST_INFO_set_serial(tst_info, serial))
617
		goto end;
618

4
	if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec) ||
619
4
	    !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, sec, usec,
620
4
	    ctx->clock_precision_digits)) ||
621
2
	    !TS_TST_INFO_set_time(tst_info, asn1_time))
622
		goto end;
623
624
	/* Setting accuracy if needed. */
625


6
	if ((ctx->seconds || ctx->millis || ctx->micros) &&
626
	    !(accuracy = TS_ACCURACY_new()))
627
		goto end;
628
629

2
	if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
630
		goto end;
631

2
	if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
632
		goto end;
633

2
	if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
634
		goto end;
635

2
	if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
636
		goto end;
637
638
	/* Setting ordering. */
639

2
	if ((ctx->flags & TS_ORDERING) &&
640
	    !TS_TST_INFO_set_ordering(tst_info, 1))
641
		goto end;
642
643
	/* Setting nonce if needed. */
644

2
	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
2
	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
2
	result = 1;
662
663
end:
664
2
	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
2
	GENERAL_NAME_free(tsa_name);
673
2
	TS_ACCURACY_free(accuracy);
674
2
	ASN1_GENERALIZEDTIME_free(asn1_time);
675
2
	ASN1_INTEGER_free(serial);
676
677
2
	return tst_info;
678
2
}
679
680
/* Processing the extensions of the request. */
681
static int
682
TS_RESP_process_extensions(TS_RESP_CTX *ctx)
683
{
684
4
	STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
685
	int i;
686
	int ok = 1;
687
688

6
	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
2
	return ok;
701
}
702
703
/* Functions for signing the TS_TST_INFO structure of the context. */
704
static int
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
4
	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
2
	if (!(p7 = PKCS7_new())) {
724
		TSerror(ERR_R_MALLOC_FAILURE);
725
		goto err;
726
	}
727
2
	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
2
	if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
732
		goto err;
733
734
	/* Add signer certificate and optional certificate chain. */
735
2
	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
4
	if (!(si = PKCS7_add_signature(p7, ctx->signer_cert,
747
2
	    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
2
	oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
754
2
	if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
755
2
	    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
4
	certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
763
2
	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
2
	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
2
	if (!TS_TST_INFO_content_new(p7))
774
		goto err;
775
776
	/* Add the DER encoded tst_info to the PKCS7 structure. */
777
2
	if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
778
		TSerror(ERR_R_MALLOC_FAILURE);
779
		goto err;
780
	}
781
782
	/* Convert tst_info to DER. */
783
2
	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
2
	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
2
	TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
796
	p7 = NULL;		/* Ownership is lost. */
797
2
	ctx->tst_info = NULL;	/* Ownership is lost. */
798
799
2
	ret = 1;
800
801
err:
802
2
	if (!ret)
803
		TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
804
	    "Error during signature "
805
	    "generation.");
806
2
	BIO_free_all(p7bio);
807
2
	ESS_SIGNING_CERT_free(sc);
808
2
	PKCS7_free(p7);
809
2
	return ret;
810
}
811
812
static ESS_SIGNING_CERT *
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
4
	if (!(sc = ESS_SIGNING_CERT_new()))
821
		goto err;
822

2
	if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
823
		goto err;
824
825
	/* Adding the signing certificate id. */
826

4
	if (!(cid = ESS_CERT_ID_new_init(signcert, 0)) ||
827
2
	    !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
828
		goto err;
829
	/* Adding the certificate chain ids. */
830
4
	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
2
	return sc;
838
839
err:
840
	ESS_SIGNING_CERT_free(sc);
841
	TSerror(ERR_R_MALLOC_FAILURE);
842
	return NULL;
843
2
}
844
845
static ESS_CERT_ID *
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
4
	X509_check_purpose(cert, -1, 0);
853
854
2
	if (!(cid = ESS_CERT_ID_new()))
855
		goto err;
856
2
	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
2
	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
2
	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
2
}
890
891
static int
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
4
	if (!(ret = PKCS7_new()))
899
		goto err;
900
2
	if (!(ret->d.other = ASN1_TYPE_new()))
901
		goto err;
902
2
	ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
903
2
	if (!(octet_string = ASN1_OCTET_STRING_new()))
904
		goto err;
905
2
	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
2
	if (!PKCS7_set_content(p7, ret))
910
		goto err;
911
912
2
	return 1;
913
914
err:
915
	ASN1_OCTET_STRING_free(octet_string);
916
	PKCS7_free(ret);
917
	return 0;
918
2
}
919
920
static int
921
ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
922
{
923
	ASN1_STRING *seq = NULL;
924
4
	unsigned char *p, *pp = NULL;
925
	int len;
926
927
2
	len = i2d_ESS_SIGNING_CERT(sc, NULL);
928
2
	if (!(pp = malloc(len))) {
929
		TSerror(ERR_R_MALLOC_FAILURE);
930
		goto err;
931
	}
932
2
	p = pp;
933
2
	i2d_ESS_SIGNING_CERT(sc, &p);
934

4
	if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
935
		TSerror(ERR_R_MALLOC_FAILURE);
936
		goto err;
937
	}
938
2
	free(pp);
939
	pp = NULL;
940
2
	return PKCS7_add_signed_attribute(si,
941
2
	    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
2
}
949
950
951
static ASN1_GENERALIZEDTIME *
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
2
	char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
957
2
	char usecstr[TS_MAX_CLOCK_PRECISION_DIGITS + 2];
958
	char *p;
959
	int rv;
960
961
2
	if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
962
		goto err;
963
964
2
	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
2
	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
2
		usecstr[0] = '\0';
999
	}
1000
6
	rv = snprintf(genTime_str, sizeof(genTime_str),
1001
	    "%04d%02d%02d%02d%02d%02d%sZ",
1002
2
	    tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1003
2
	    tm->tm_hour, tm->tm_min, tm->tm_sec, usecstr);
1004

4
	if (rv == -1 || rv >= sizeof(genTime_str))
1005
		goto err;
1006
1007
	/* Now call OpenSSL to check and set our genTime value */
1008

4
	if (!asn1_time && !(asn1_time = ASN1_GENERALIZEDTIME_new()))
1009
		goto err;
1010
2
	if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
1011
		ASN1_GENERALIZEDTIME_free(asn1_time);
1012
		goto err;
1013
	}
1014
1015
2
	return asn1_time;
1016
1017
err:
1018
	TSerror(TS_R_COULD_NOT_SET_TIME);
1019
	return NULL;
1020
2
}