1 /* $OpenBSD: ts.c,v 1.24 2022/09/11 18:08:17 tb Exp $ */
2 /* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
3 * project 2002.
4 */
5 /* ====================================================================
6 * Copyright (c) 2001 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 <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62
63 #include "apps.h"
64
65 #include <openssl/bio.h>
66 #include <openssl/bn.h>
67 #include <openssl/err.h>
68 #include <openssl/pem.h>
69 #include <openssl/ts.h>
70
71 /* Length of the nonce of the request in bits (must be a multiple of 8). */
72 #define NONCE_LENGTH 64
73
74 /* Macro definitions for the configuration file. */
75 #define ENV_OID_FILE "oid_file"
76
77 /* Local function declarations. */
78
79 static ASN1_OBJECT *txt2obj(const char *oid);
80 static CONF *load_config_file(const char *configfile);
81
82 /* Query related functions. */
83 static int query_command(const char *data, char *digest, const EVP_MD *md,
84 const char *policy, int no_nonce, int cert, const char *in, const char *out,
85 int text);
86 static BIO *BIO_open_with_default(const char *file, const char *mode,
87 FILE *default_fp);
88 static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
89 const char *policy, int no_nonce, int cert);
90 static int create_digest(BIO *input, char *digest, const EVP_MD *md,
91 unsigned char **md_value);
92 static ASN1_INTEGER *create_nonce(int bits);
93
94 /* Reply related functions. */
95 static int reply_command(CONF *conf, char *section, char *queryfile,
96 char *passin, char *inkey, char *signer, char *chain, const char *policy,
97 char *in, int token_in, char *out, int token_out, int text);
98 static TS_RESP *read_PKCS7(BIO *in_bio);
99 static TS_RESP *create_response(CONF *conf, const char *section,
100 char *queryfile, char *passin, char *inkey, char *signer, char *chain,
101 const char *policy);
102 static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data);
103 static ASN1_INTEGER *next_serial(const char *serialfile);
104 static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial);
105
106 /* Verify related functions. */
107 static int verify_command(char *data, char *digest, char *queryfile, char *in,
108 int token_in, char *ca_path, char *ca_file, char *untrusted);
109 static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest,
110 char *queryfile, char *ca_path, char *ca_file, char *untrusted);
111 static X509_STORE *create_cert_store(char *ca_path, char *ca_file);
112 static int verify_cb(int ok, X509_STORE_CTX *ctx);
113
114 enum mode {
115 CMD_NONE, CMD_QUERY, CMD_REPLY, CMD_VERIFY
116 };
117
118 static struct {
119 char *ca_file;
120 char *ca_path;
121 int cert;
122 char *chain;
123 char *configfile;
124 char *data;
125 char *digest;
126 char *in;
127 char *inkey;
128 const EVP_MD *md;
129 int mode;
130 int no_nonce;
131 char *out;
132 char *passin;
133 char *policy;
134 char *queryfile;
135 char *section;
136 char *signer;
137 int text;
138 int token_in;
139 int token_out;
140 char *untrusted;
141 } ts_config;
142
143 static int
ts_opt_md(int argc,char ** argv,int * argsused)144 ts_opt_md(int argc, char **argv, int *argsused)
145 {
146 char *name = argv[0];
147
148 if (*name++ != '-')
149 return (1);
150
151 if ((ts_config.md = EVP_get_digestbyname(name)) == NULL)
152 return (1);
153
154 *argsused = 1;
155 return (0);
156 }
157
158 static int
ts_opt_query(void)159 ts_opt_query(void)
160 {
161 if (ts_config.mode != CMD_NONE)
162 return (1);
163 ts_config.mode = CMD_QUERY;
164 return (0);
165 }
166
167 static int
ts_opt_reply(void)168 ts_opt_reply(void)
169 {
170 if (ts_config.mode != CMD_NONE)
171 return (1);
172 ts_config.mode = CMD_REPLY;
173 return (0);
174 }
175
176 static int
ts_opt_verify(void)177 ts_opt_verify(void)
178 {
179 if (ts_config.mode != CMD_NONE)
180 return (1);
181 ts_config.mode = CMD_VERIFY;
182 return (0);
183 }
184
185 static const struct option ts_options[] = {
186 {
187 .name = "CAfile",
188 .argname = "file",
189 .desc = "Certificate Authority file",
190 .type = OPTION_ARG,
191 .opt.arg = &ts_config.ca_file,
192 },
193 {
194 .name = "CApath",
195 .argname = "path",
196 .desc = "Certificate Authority path",
197 .type = OPTION_ARG,
198 .opt.arg = &ts_config.ca_path,
199 },
200 {
201 .name = "cert",
202 .desc = "Include signing certificate in the response",
203 .type = OPTION_FLAG,
204 .opt.flag = &ts_config.cert,
205 },
206 {
207 .name = "chain",
208 .argname = "file",
209 .desc = "PEM certificates that will be included in the response",
210 .type = OPTION_ARG,
211 .opt.arg = &ts_config.chain,
212 },
213 {
214 .name = "config",
215 .argname = "file",
216 .desc = "Specify an alternative configuration file",
217 .type = OPTION_ARG,
218 .opt.arg = &ts_config.configfile,
219 },
220 {
221 .name = "data",
222 .argname = "file",
223 .desc = "Data file for which the time stamp request needs to be created",
224 .type = OPTION_ARG,
225 .opt.arg = &ts_config.data,
226 },
227 {
228 .name = "digest",
229 .argname = "arg",
230 .desc = "Specify the message imprint explicitly without the data file",
231 .type = OPTION_ARG,
232 .opt.arg = &ts_config.digest,
233 },
234 {
235 .name = "in",
236 .argname = "file",
237 .desc = "Input file",
238 .type = OPTION_ARG,
239 .opt.arg = &ts_config.in,
240 },
241 {
242 .name = "inkey",
243 .argname = "file",
244 .desc = "Input key file",
245 .type = OPTION_ARG,
246 .opt.arg = &ts_config.inkey,
247 },
248 {
249 .name = "no_nonce",
250 .desc = "Specify no nonce in the request",
251 .type = OPTION_FLAG,
252 .opt.flag = &ts_config.no_nonce,
253 },
254 {
255 .name = "out",
256 .argname = "file",
257 .desc = "Output file",
258 .type = OPTION_ARG,
259 .opt.arg = &ts_config.out,
260 },
261 {
262 .name = "passin",
263 .argname = "src",
264 .desc = "Private key password source",
265 .type = OPTION_ARG,
266 .opt.arg = &ts_config.passin,
267 },
268 {
269 .name = "policy",
270 .argname = "object_id",
271 .desc = "Policy for the TSA to use when creating the time stamp token",
272 .type = OPTION_ARG,
273 .opt.arg = &ts_config.policy,
274 },
275 {
276 .name = "query",
277 .desc = "Create and print a time stamp request",
278 .type = OPTION_FUNC,
279 .opt.func = ts_opt_query,
280 },
281 {
282 .name = "queryfile",
283 .argname = "file",
284 .desc = "File containing a DER-encoded time stamp request",
285 .type = OPTION_ARG,
286 .opt.arg = &ts_config.queryfile,
287 },
288 {
289 .name = "reply",
290 .desc = "Create a time stamp response",
291 .type = OPTION_FUNC,
292 .opt.func = ts_opt_reply,
293 },
294 {
295 .name = "section",
296 .argname = "arg",
297 .desc = "TSA section containing the settings for response generation",
298 .type = OPTION_ARG,
299 .opt.arg = &ts_config.section,
300 },
301 {
302 .name = "signer",
303 .argname = "file",
304 .desc = "Signer certificate file",
305 .type = OPTION_ARG,
306 .opt.arg = &ts_config.signer,
307 },
308 {
309 .name = "text",
310 .desc = "Output in human-readable text format",
311 .type = OPTION_FLAG,
312 .opt.flag = &ts_config.text,
313 },
314 {
315 .name = "token_in",
316 .desc = "Input is a DER-encoded time stamp token",
317 .type = OPTION_FLAG,
318 .opt.flag = &ts_config.token_in,
319 },
320 {
321 .name = "token_out",
322 .desc = "Output is a DER-encoded time stamp token",
323 .type = OPTION_FLAG,
324 .opt.flag = &ts_config.token_out,
325 },
326 {
327 .name = "untrusted",
328 .argname = "file",
329 .desc = "File containing untrusted certificates",
330 .type = OPTION_ARG,
331 .opt.arg = &ts_config.untrusted,
332 },
333 {
334 .name = "verify",
335 .desc = "Verify a time stamp response",
336 .type = OPTION_FUNC,
337 .opt.func = ts_opt_verify,
338 },
339 {
340 .name = NULL,
341 .desc = "",
342 .type = OPTION_ARGV_FUNC,
343 .opt.argvfunc = ts_opt_md,
344 },
345 { NULL },
346 };
347
348 static void
ts_usage(void)349 ts_usage(void)
350 {
351 fprintf(stderr, "usage:\n"
352 "ts -query [-md4 | -md5 | -ripemd160 | -sha1] [-cert]\n"
353 " [-config configfile] [-data file_to_hash]\n"
354 " [-digest digest_bytes] [-in request.tsq] [-no_nonce]\n"
355 " [-out request.tsq] [-policy object_id] [-text]\n");
356 fprintf(stderr, "\n"
357 "ts -reply [-chain certs_file.pem] [-config configfile]\n"
358 " [-in response.tsr] [-inkey private.pem] [-out response.tsr]\n"
359 " [-passin arg] [-policy object_id] [-queryfile request.tsq]\n"
360 " [-section tsa_section] [-signer tsa_cert.pem] [-text]\n"
361 " [-token_in] [-token_out]\n");
362 fprintf(stderr, "\n"
363 "ts -verify [-CAfile trusted_certs.pem]\n"
364 " [-CApath trusted_cert_path] [-data file_to_hash]\n"
365 " [-digest digest_bytes] [-in response.tsr]\n"
366 " [-queryfile request.tsq] [-token_in]\n"
367 " [-untrusted cert_file.pem]\n");
368 fprintf(stderr, "\n");
369 options_usage(ts_options);
370 fprintf(stderr, "\n");
371 }
372
373 int
ts_main(int argc,char ** argv)374 ts_main(int argc, char **argv)
375 {
376 int ret = 1;
377 CONF *conf = NULL;
378 char *password = NULL; /* Password itself. */
379
380 if (single_execution) {
381 if (pledge("stdio cpath wpath rpath tty", NULL) == -1) {
382 perror("pledge");
383 exit(1);
384 }
385 }
386
387 memset(&ts_config, 0, sizeof(ts_config));
388 ts_config.mode = CMD_NONE;
389
390 if (options_parse(argc, argv, ts_options, NULL, NULL) != 0)
391 goto usage;
392
393 /* Get the password if required. */
394 if (ts_config.mode == CMD_REPLY && ts_config.passin != NULL &&
395 !app_passwd(bio_err, ts_config.passin, NULL, &password, NULL)) {
396 BIO_printf(bio_err, "Error getting password.\n");
397 goto cleanup;
398 }
399 /*
400 * Check consistency of parameters and execute the appropriate
401 * function.
402 */
403 switch (ts_config.mode) {
404 case CMD_NONE:
405 goto usage;
406 case CMD_QUERY:
407 /*
408 * Data file and message imprint cannot be specified at the
409 * same time.
410 */
411 ret = ts_config.data != NULL && ts_config.digest != NULL;
412 if (ret)
413 goto usage;
414 /* Load the config file for possible policy OIDs. */
415 conf = load_config_file(ts_config.configfile);
416 ret = !query_command(ts_config.data, ts_config.digest,
417 ts_config.md, ts_config.policy, ts_config.no_nonce,
418 ts_config.cert, ts_config.in, ts_config.out,
419 ts_config.text);
420 break;
421 case CMD_REPLY:
422 conf = load_config_file(ts_config.configfile);
423 if (ts_config.in == NULL) {
424 ret = !(ts_config.queryfile != NULL && conf != NULL &&
425 !ts_config.token_in);
426 if (ret)
427 goto usage;
428 } else {
429 /* 'in' and 'queryfile' are exclusive. */
430 ret = !(ts_config.queryfile == NULL);
431 if (ret)
432 goto usage;
433 }
434
435 ret = !reply_command(conf, ts_config.section,
436 ts_config.queryfile, password, ts_config.inkey,
437 ts_config.signer, ts_config.chain, ts_config.policy,
438 ts_config.in, ts_config.token_in, ts_config.out,
439 ts_config.token_out, ts_config.text);
440 break;
441 case CMD_VERIFY:
442 ret = !(((ts_config.queryfile != NULL && ts_config.data == NULL &&
443 ts_config.digest == NULL) ||
444 (ts_config.queryfile == NULL && ts_config.data != NULL &&
445 ts_config.digest == NULL) ||
446 (ts_config.queryfile == NULL && ts_config.data == NULL &&
447 ts_config.digest != NULL)) &&
448 ts_config.in != NULL);
449 if (ret)
450 goto usage;
451
452 ret = !verify_command(ts_config.data, ts_config.digest,
453 ts_config.queryfile, ts_config.in, ts_config.token_in,
454 ts_config.ca_path, ts_config.ca_file, ts_config.untrusted);
455 }
456
457 goto cleanup;
458
459 usage:
460 ts_usage();
461
462 cleanup:
463 /* Clean up. */
464 NCONF_free(conf);
465 free(password);
466 OBJ_cleanup();
467
468 return (ret);
469 }
470
471 /*
472 * Configuration file-related function definitions.
473 */
474
475 static ASN1_OBJECT *
txt2obj(const char * oid)476 txt2obj(const char *oid)
477 {
478 ASN1_OBJECT *oid_obj = NULL;
479
480 if ((oid_obj = OBJ_txt2obj(oid, 0)) == NULL)
481 BIO_printf(bio_err, "cannot convert %s to OID\n", oid);
482
483 return oid_obj;
484 }
485
486 static CONF *
load_config_file(const char * configfile)487 load_config_file(const char *configfile)
488 {
489 CONF *conf = NULL;
490 long errorline = -1;
491
492 if (configfile == NULL)
493 configfile = getenv("OPENSSL_CONF");
494
495 if (configfile != NULL &&
496 ((conf = NCONF_new(NULL)) == NULL ||
497 NCONF_load(conf, configfile, &errorline) <= 0)) {
498 if (errorline <= 0)
499 BIO_printf(bio_err, "error loading the config file "
500 "'%s'\n", configfile);
501 else
502 BIO_printf(bio_err, "error on line %ld of config file "
503 "'%s'\n", errorline, configfile);
504 }
505 if (conf != NULL) {
506 const char *p;
507
508 BIO_printf(bio_err, "Using configuration from %s\n",
509 configfile);
510 p = NCONF_get_string(conf, NULL, ENV_OID_FILE);
511 if (p != NULL) {
512 BIO *oid_bio = BIO_new_file(p, "r");
513 if (oid_bio == NULL)
514 ERR_print_errors(bio_err);
515 else {
516 OBJ_create_objects(oid_bio);
517 BIO_free_all(oid_bio);
518 }
519 } else
520 ERR_clear_error();
521 if (!add_oid_section(bio_err, conf))
522 ERR_print_errors(bio_err);
523 }
524 return conf;
525 }
526
527 /*
528 * Query-related method definitions.
529 */
530
531 static int
query_command(const char * data,char * digest,const EVP_MD * md,const char * policy,int no_nonce,int cert,const char * in,const char * out,int text)532 query_command(const char *data, char *digest, const EVP_MD *md,
533 const char *policy, int no_nonce, int cert, const char *in, const char *out,
534 int text)
535 {
536 int ret = 0;
537 TS_REQ *query = NULL;
538 BIO *in_bio = NULL;
539 BIO *data_bio = NULL;
540 BIO *out_bio = NULL;
541
542 /* Build query object either from file or from scratch. */
543 if (in != NULL) {
544 if ((in_bio = BIO_new_file(in, "rb")) == NULL)
545 goto end;
546 query = d2i_TS_REQ_bio(in_bio, NULL);
547 } else {
548 /* Open the file if no explicit digest bytes were specified. */
549 if (digest == NULL &&
550 (data_bio = BIO_open_with_default(data, "rb", stdin)) == NULL)
551 goto end;
552 /* Creating the query object. */
553 query = create_query(data_bio, digest, md,
554 policy, no_nonce, cert);
555 /* Saving the random number generator state. */
556 }
557 if (query == NULL)
558 goto end;
559
560 /* Write query either in ASN.1 or in text format. */
561 if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL)
562 goto end;
563 if (text) {
564 /* Text output. */
565 if (!TS_REQ_print_bio(out_bio, query))
566 goto end;
567 } else {
568 /* ASN.1 output. */
569 if (!i2d_TS_REQ_bio(out_bio, query))
570 goto end;
571 }
572
573 ret = 1;
574
575 end:
576 ERR_print_errors(bio_err);
577
578 /* Clean up. */
579 BIO_free_all(in_bio);
580 BIO_free_all(data_bio);
581 BIO_free_all(out_bio);
582 TS_REQ_free(query);
583
584 return ret;
585 }
586
587 static BIO *
BIO_open_with_default(const char * file,const char * mode,FILE * default_fp)588 BIO_open_with_default(const char *file, const char *mode, FILE *default_fp)
589 {
590 return file == NULL ? BIO_new_fp(default_fp, BIO_NOCLOSE) :
591 BIO_new_file(file, mode);
592 }
593
594 static TS_REQ *
create_query(BIO * data_bio,char * digest,const EVP_MD * md,const char * policy,int no_nonce,int cert)595 create_query(BIO *data_bio, char *digest, const EVP_MD *md, const char *policy,
596 int no_nonce, int cert)
597 {
598 int ret = 0;
599 TS_REQ *ts_req = NULL;
600 int len;
601 TS_MSG_IMPRINT *msg_imprint = NULL;
602 X509_ALGOR *algo = NULL;
603 unsigned char *data = NULL;
604 ASN1_OBJECT *policy_obj = NULL;
605 ASN1_INTEGER *nonce_asn1 = NULL;
606
607 /* Setting default message digest. */
608 if (md == NULL && (md = EVP_get_digestbyname("sha1")) == NULL)
609 goto err;
610
611 /* Creating request object. */
612 if ((ts_req = TS_REQ_new()) == NULL)
613 goto err;
614
615 /* Setting version. */
616 if (!TS_REQ_set_version(ts_req, 1))
617 goto err;
618
619 /* Creating and adding MSG_IMPRINT object. */
620 if ((msg_imprint = TS_MSG_IMPRINT_new()) == NULL)
621 goto err;
622
623 /* Adding algorithm. */
624 if ((algo = X509_ALGOR_new()) == NULL)
625 goto err;
626 if ((algo->algorithm = OBJ_nid2obj(EVP_MD_type(md))) == NULL)
627 goto err;
628 if ((algo->parameter = ASN1_TYPE_new()) == NULL)
629 goto err;
630 algo->parameter->type = V_ASN1_NULL;
631 if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo))
632 goto err;
633
634 /* Adding message digest. */
635 if ((len = create_digest(data_bio, digest, md, &data)) == 0)
636 goto err;
637 if (!TS_MSG_IMPRINT_set_msg(msg_imprint, data, len))
638 goto err;
639
640 if (!TS_REQ_set_msg_imprint(ts_req, msg_imprint))
641 goto err;
642
643 /* Setting policy if requested. */
644 if (policy != NULL && (policy_obj = txt2obj(policy)) == NULL)
645 goto err;
646 if (policy_obj != NULL && !TS_REQ_set_policy_id(ts_req, policy_obj))
647 goto err;
648
649 /* Setting nonce if requested. */
650 if (!no_nonce && (nonce_asn1 = create_nonce(NONCE_LENGTH)) == NULL)
651 goto err;
652 if (nonce_asn1 != NULL && !TS_REQ_set_nonce(ts_req, nonce_asn1))
653 goto err;
654
655 /* Setting certificate request flag if requested. */
656 if (!TS_REQ_set_cert_req(ts_req, cert))
657 goto err;
658
659 ret = 1;
660
661 err:
662 if (!ret) {
663 TS_REQ_free(ts_req);
664 ts_req = NULL;
665 BIO_printf(bio_err, "could not create query\n");
666 }
667 TS_MSG_IMPRINT_free(msg_imprint);
668 X509_ALGOR_free(algo);
669 free(data);
670 ASN1_OBJECT_free(policy_obj);
671 ASN1_INTEGER_free(nonce_asn1);
672
673 return ts_req;
674 }
675
676 static int
create_digest(BIO * input,char * digest,const EVP_MD * md,unsigned char ** md_value)677 create_digest(BIO *input, char *digest, const EVP_MD *md,
678 unsigned char **md_value)
679 {
680 int md_value_len;
681 EVP_MD_CTX *md_ctx = NULL;
682
683 md_value_len = EVP_MD_size(md);
684 if (md_value_len < 0)
685 goto err;
686
687 if (input != NULL) {
688 /* Digest must be computed from an input file. */
689 unsigned char buffer[4096];
690 int length;
691
692 *md_value = malloc(md_value_len);
693 if (*md_value == NULL)
694 goto err;
695
696 if ((md_ctx = EVP_MD_CTX_new()) == NULL)
697 goto err;
698
699 if (!EVP_DigestInit(md_ctx, md))
700 goto err;
701
702 while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) {
703 if (!EVP_DigestUpdate(md_ctx, buffer, length))
704 goto err;
705 }
706
707 if (!EVP_DigestFinal(md_ctx, *md_value, NULL))
708 goto err;
709
710 EVP_MD_CTX_free(md_ctx);
711 md_ctx = NULL;
712
713 } else {
714 /* Digest bytes are specified with digest. */
715 long digest_len;
716
717 *md_value = string_to_hex(digest, &digest_len);
718 if (*md_value == NULL || md_value_len != digest_len) {
719 free(*md_value);
720 *md_value = NULL;
721 BIO_printf(bio_err, "bad digest, %d bytes "
722 "must be specified\n", md_value_len);
723 goto err;
724 }
725 }
726
727 return md_value_len;
728
729 err:
730 EVP_MD_CTX_free(md_ctx);
731 return 0;
732 }
733
734 static ASN1_INTEGER *
create_nonce(int bits)735 create_nonce(int bits)
736 {
737 unsigned char buf[20];
738 ASN1_INTEGER *nonce = NULL;
739 int len = (bits - 1) / 8 + 1;
740 int i;
741
742 /* Generating random byte sequence. */
743 if (len > (int) sizeof(buf))
744 goto err;
745 arc4random_buf(buf, len);
746
747 /* Find the first non-zero byte and creating ASN1_INTEGER object. */
748 for (i = 0; i < len && !buf[i]; ++i)
749 ;
750 if ((nonce = ASN1_INTEGER_new()) == NULL)
751 goto err;
752 free(nonce->data);
753 /* Allocate at least one byte. */
754 nonce->length = len - i;
755 if ((nonce->data = malloc(nonce->length + 1)) == NULL)
756 goto err;
757 memcpy(nonce->data, buf + i, nonce->length);
758
759 return nonce;
760
761 err:
762 BIO_printf(bio_err, "could not create nonce\n");
763 ASN1_INTEGER_free(nonce);
764 return NULL;
765 }
766
767 /*
768 * Reply-related method definitions.
769 */
770
771 static int
reply_command(CONF * conf,char * section,char * queryfile,char * passin,char * inkey,char * signer,char * chain,const char * policy,char * in,int token_in,char * out,int token_out,int text)772 reply_command(CONF *conf, char *section, char *queryfile, char *passin,
773 char *inkey, char *signer, char *chain, const char *policy, char *in,
774 int token_in, char *out, int token_out, int text)
775 {
776 int ret = 0;
777 TS_RESP *response = NULL;
778 BIO *in_bio = NULL;
779 BIO *query_bio = NULL;
780 BIO *inkey_bio = NULL;
781 BIO *signer_bio = NULL;
782 BIO *out_bio = NULL;
783
784 /* Build response object either from response or query. */
785 if (in != NULL) {
786 if ((in_bio = BIO_new_file(in, "rb")) == NULL)
787 goto end;
788 if (token_in) {
789 /*
790 * We have a ContentInfo (PKCS7) object, add
791 * 'granted' status info around it.
792 */
793 response = read_PKCS7(in_bio);
794 } else {
795 /* We have a ready-made TS_RESP object. */
796 response = d2i_TS_RESP_bio(in_bio, NULL);
797 }
798 } else {
799 response = create_response(conf, section, queryfile, passin,
800 inkey, signer, chain, policy);
801 if (response != NULL)
802 BIO_printf(bio_err, "Response has been generated.\n");
803 else
804 BIO_printf(bio_err, "Response is not generated.\n");
805 }
806 if (response == NULL)
807 goto end;
808
809 /* Write response either in ASN.1 or text format. */
810 if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL)
811 goto end;
812 if (text) {
813 /* Text output. */
814 if (token_out) {
815 TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
816 if (!TS_TST_INFO_print_bio(out_bio, tst_info))
817 goto end;
818 } else {
819 if (!TS_RESP_print_bio(out_bio, response))
820 goto end;
821 }
822 } else {
823 /* ASN.1 DER output. */
824 if (token_out) {
825 PKCS7 *token = TS_RESP_get_token(response);
826 if (!i2d_PKCS7_bio(out_bio, token))
827 goto end;
828 } else {
829 if (!i2d_TS_RESP_bio(out_bio, response))
830 goto end;
831 }
832 }
833
834 ret = 1;
835
836 end:
837 ERR_print_errors(bio_err);
838
839 /* Clean up. */
840 BIO_free_all(in_bio);
841 BIO_free_all(query_bio);
842 BIO_free_all(inkey_bio);
843 BIO_free_all(signer_bio);
844 BIO_free_all(out_bio);
845 TS_RESP_free(response);
846
847 return ret;
848 }
849
850 /* Reads a PKCS7 token and adds default 'granted' status info to it. */
851 static TS_RESP *
read_PKCS7(BIO * in_bio)852 read_PKCS7(BIO *in_bio)
853 {
854 int ret = 0;
855 PKCS7 *token = NULL;
856 TS_TST_INFO *tst_info = NULL;
857 TS_RESP *resp = NULL;
858 TS_STATUS_INFO *si = NULL;
859
860 /* Read PKCS7 object and extract the signed time stamp info. */
861 if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)
862 goto end;
863 if ((tst_info = PKCS7_to_TS_TST_INFO(token)) == NULL)
864 goto end;
865
866 /* Creating response object. */
867 if ((resp = TS_RESP_new()) == NULL)
868 goto end;
869
870 /* Create granted status info. */
871 if ((si = TS_STATUS_INFO_new()) == NULL)
872 goto end;
873 if (!TS_STATUS_INFO_set_status(si, TS_STATUS_GRANTED))
874 goto end;
875 if (!TS_RESP_set_status_info(resp, si))
876 goto end;
877
878 /* Setting encapsulated token. */
879 TS_RESP_set_tst_info(resp, token, tst_info);
880 token = NULL; /* Ownership is lost. */
881 tst_info = NULL; /* Ownership is lost. */
882
883 ret = 1;
884 end:
885 PKCS7_free(token);
886 TS_TST_INFO_free(tst_info);
887 if (!ret) {
888 TS_RESP_free(resp);
889 resp = NULL;
890 }
891 TS_STATUS_INFO_free(si);
892 return resp;
893 }
894
895 static TS_RESP *
create_response(CONF * conf,const char * section,char * queryfile,char * passin,char * inkey,char * signer,char * chain,const char * policy)896 create_response(CONF *conf, const char *section, char *queryfile, char *passin,
897 char *inkey, char *signer, char *chain, const char *policy)
898 {
899 int ret = 0;
900 TS_RESP *response = NULL;
901 BIO *query_bio = NULL;
902 TS_RESP_CTX *resp_ctx = NULL;
903
904 if ((query_bio = BIO_new_file(queryfile, "rb")) == NULL)
905 goto end;
906
907 /* Getting TSA configuration section. */
908 if ((section = TS_CONF_get_tsa_section(conf, section)) == NULL)
909 goto end;
910
911 /* Setting up response generation context. */
912 if ((resp_ctx = TS_RESP_CTX_new()) == NULL)
913 goto end;
914
915 /* Setting serial number provider callback. */
916 if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx))
917 goto end;
918
919 /* Setting TSA signer certificate. */
920 if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx))
921 goto end;
922
923 /* Setting TSA signer certificate chain. */
924 if (!TS_CONF_set_certs(conf, section, chain, resp_ctx))
925 goto end;
926
927 /* Setting TSA signer private key. */
928 if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx))
929 goto end;
930
931 /* Setting default policy OID. */
932 if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx))
933 goto end;
934
935 /* Setting acceptable policy OIDs. */
936 if (!TS_CONF_set_policies(conf, section, resp_ctx))
937 goto end;
938
939 /* Setting the acceptable one-way hash algorithms. */
940 if (!TS_CONF_set_digests(conf, section, resp_ctx))
941 goto end;
942
943 /* Setting guaranteed time stamp accuracy. */
944 if (!TS_CONF_set_accuracy(conf, section, resp_ctx))
945 goto end;
946
947 /* Setting the precision of the time. */
948 if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx))
949 goto end;
950
951 /* Setting the ordering flaf if requested. */
952 if (!TS_CONF_set_ordering(conf, section, resp_ctx))
953 goto end;
954
955 /* Setting the TSA name required flag if requested. */
956 if (!TS_CONF_set_tsa_name(conf, section, resp_ctx))
957 goto end;
958
959 /* Setting the ESS cert id chain flag if requested. */
960 if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx))
961 goto end;
962
963 /* Creating the response. */
964 if ((response = TS_RESP_create_response(resp_ctx, query_bio)) == NULL)
965 goto end;
966
967 ret = 1;
968 end:
969 if (!ret) {
970 TS_RESP_free(response);
971 response = NULL;
972 }
973 TS_RESP_CTX_free(resp_ctx);
974 BIO_free_all(query_bio);
975
976 return response;
977 }
978
979 static ASN1_INTEGER *
serial_cb(TS_RESP_CTX * ctx,void * data)980 serial_cb(TS_RESP_CTX *ctx, void *data)
981 {
982 const char *serial_file = (const char *) data;
983 ASN1_INTEGER *serial = next_serial(serial_file);
984
985 if (serial == NULL) {
986 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
987 "Error during serial number "
988 "generation.");
989 TS_RESP_CTX_add_failure_info(ctx,
990 TS_INFO_ADD_INFO_NOT_AVAILABLE);
991 } else
992 save_ts_serial(serial_file, serial);
993
994 return serial;
995 }
996
997 static ASN1_INTEGER *
next_serial(const char * serialfile)998 next_serial(const char *serialfile)
999 {
1000 int ret = 0;
1001 BIO *in = NULL;
1002 ASN1_INTEGER *serial = NULL;
1003 BIGNUM *bn = NULL;
1004
1005 if ((serial = ASN1_INTEGER_new()) == NULL)
1006 goto err;
1007
1008 if ((in = BIO_new_file(serialfile, "r")) == NULL) {
1009 ERR_clear_error();
1010 BIO_printf(bio_err, "Warning: could not open file %s for "
1011 "reading, using serial number: 1\n", serialfile);
1012 if (!ASN1_INTEGER_set(serial, 1))
1013 goto err;
1014 } else {
1015 char buf[1024];
1016 if (!a2i_ASN1_INTEGER(in, serial, buf, sizeof(buf))) {
1017 BIO_printf(bio_err, "unable to load number from %s\n",
1018 serialfile);
1019 goto err;
1020 }
1021 if ((bn = ASN1_INTEGER_to_BN(serial, NULL)) == NULL)
1022 goto err;
1023 ASN1_INTEGER_free(serial);
1024 serial = NULL;
1025 if (!BN_add_word(bn, 1))
1026 goto err;
1027 if ((serial = BN_to_ASN1_INTEGER(bn, NULL)) == NULL)
1028 goto err;
1029 }
1030 ret = 1;
1031 err:
1032 if (!ret) {
1033 ASN1_INTEGER_free(serial);
1034 serial = NULL;
1035 }
1036 BIO_free_all(in);
1037 BN_free(bn);
1038 return serial;
1039 }
1040
1041 static int
save_ts_serial(const char * serialfile,ASN1_INTEGER * serial)1042 save_ts_serial(const char *serialfile, ASN1_INTEGER *serial)
1043 {
1044 int ret = 0;
1045 BIO *out = NULL;
1046
1047 if ((out = BIO_new_file(serialfile, "w")) == NULL)
1048 goto err;
1049 if (i2a_ASN1_INTEGER(out, serial) <= 0)
1050 goto err;
1051 if (BIO_puts(out, "\n") <= 0)
1052 goto err;
1053 ret = 1;
1054 err:
1055 if (!ret)
1056 BIO_printf(bio_err, "could not save serial number to %s\n",
1057 serialfile);
1058 BIO_free_all(out);
1059 return ret;
1060 }
1061
1062 /*
1063 * Verify-related method definitions.
1064 */
1065
1066 static int
verify_command(char * data,char * digest,char * queryfile,char * in,int token_in,char * ca_path,char * ca_file,char * untrusted)1067 verify_command(char *data, char *digest, char *queryfile, char *in,
1068 int token_in, char *ca_path, char *ca_file, char *untrusted)
1069 {
1070 BIO *in_bio = NULL;
1071 PKCS7 *token = NULL;
1072 TS_RESP *response = NULL;
1073 TS_VERIFY_CTX *verify_ctx = NULL;
1074 int ret = 0;
1075
1076 /* Decode the token (PKCS7) or response (TS_RESP) files. */
1077 if ((in_bio = BIO_new_file(in, "rb")) == NULL)
1078 goto end;
1079 if (token_in) {
1080 if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)
1081 goto end;
1082 } else {
1083 if ((response = d2i_TS_RESP_bio(in_bio, NULL)) == NULL)
1084 goto end;
1085 }
1086
1087 if ((verify_ctx = create_verify_ctx(data, digest, queryfile,
1088 ca_path, ca_file, untrusted)) == NULL)
1089 goto end;
1090
1091 /* Checking the token or response against the request. */
1092 ret = token_in ?
1093 TS_RESP_verify_token(verify_ctx, token) :
1094 TS_RESP_verify_response(verify_ctx, response);
1095
1096 end:
1097 printf("Verification: ");
1098 if (ret)
1099 printf("OK\n");
1100 else {
1101 printf("FAILED\n");
1102 /* Print errors, if there are any. */
1103 ERR_print_errors(bio_err);
1104 }
1105
1106 /* Clean up. */
1107 BIO_free_all(in_bio);
1108 PKCS7_free(token);
1109 TS_RESP_free(response);
1110 TS_VERIFY_CTX_free(verify_ctx);
1111 return ret;
1112 }
1113
1114 static TS_VERIFY_CTX *
create_verify_ctx(char * data,char * digest,char * queryfile,char * ca_path,char * ca_file,char * untrusted)1115 create_verify_ctx(char *data, char *digest, char *queryfile, char *ca_path,
1116 char *ca_file, char *untrusted)
1117 {
1118 TS_VERIFY_CTX *ctx = NULL;
1119 BIO *input = NULL;
1120 TS_REQ *request = NULL;
1121 X509_STORE *store;
1122 STACK_OF(X509) *certs;
1123 int ret = 0;
1124
1125 if (data != NULL || digest != NULL) {
1126 if ((ctx = TS_VERIFY_CTX_new()) == NULL)
1127 goto err;
1128 TS_VERIFY_CTX_set_flags(ctx, TS_VFY_VERSION | TS_VFY_SIGNER);
1129 if (data != NULL) {
1130 BIO *data_bio;
1131
1132 TS_VERIFY_CTX_add_flags(ctx, TS_VFY_DATA);
1133 if ((data_bio = BIO_new_file(data, "rb")) == NULL)
1134 goto err;
1135 TS_VERIFY_CTX_set_data(ctx, data_bio);
1136 } else if (digest != NULL) {
1137 unsigned char *imprint;
1138 long imprint_len;
1139
1140 TS_VERIFY_CTX_add_flags(ctx, TS_VFY_IMPRINT);
1141 if ((imprint = string_to_hex(digest,
1142 &imprint_len)) == NULL) {
1143 BIO_printf(bio_err, "invalid digest string\n");
1144 goto err;
1145 }
1146 TS_VERIFY_CTX_set_imprint(ctx, imprint, imprint_len);
1147 }
1148 } else if (queryfile != NULL) {
1149 /*
1150 * The request has just to be read, decoded and converted to
1151 * a verify context object.
1152 */
1153 if ((input = BIO_new_file(queryfile, "rb")) == NULL)
1154 goto err;
1155 if ((request = d2i_TS_REQ_bio(input, NULL)) == NULL)
1156 goto err;
1157 if ((ctx = TS_REQ_to_TS_VERIFY_CTX(request, NULL)) == NULL)
1158 goto err;
1159 } else
1160 return NULL;
1161
1162 /* Add the signature verification flag and arguments. */
1163 TS_VERIFY_CTX_add_flags(ctx, TS_VFY_SIGNATURE);
1164
1165 /* Initialising the X509_STORE object. */
1166 if ((store = create_cert_store(ca_path, ca_file)) == NULL)
1167 goto err;
1168 TS_VERIFY_CTX_set_store(ctx, store);
1169
1170 /* Loading untrusted certificates. */
1171 if (untrusted != NULL) {
1172 if ((certs = TS_CONF_load_certs(untrusted)) == NULL)
1173 goto err;
1174 TS_VERIFY_CTX_set_certs(ctx, certs);
1175 }
1176
1177 ret = 1;
1178 err:
1179 if (!ret) {
1180 TS_VERIFY_CTX_free(ctx);
1181 ctx = NULL;
1182 }
1183 BIO_free_all(input);
1184 TS_REQ_free(request);
1185 return ctx;
1186 }
1187
1188 static X509_STORE *
create_cert_store(char * ca_path,char * ca_file)1189 create_cert_store(char *ca_path, char *ca_file)
1190 {
1191 X509_STORE *cert_ctx = NULL;
1192 X509_LOOKUP *lookup = NULL;
1193 int i;
1194
1195 /* Creating the X509_STORE object. */
1196 if ((cert_ctx = X509_STORE_new()) == NULL)
1197 goto err;
1198
1199 /* Setting the callback for certificate chain verification. */
1200 X509_STORE_set_verify_cb(cert_ctx, verify_cb);
1201
1202 /* Adding a trusted certificate directory source. */
1203 if (ca_path != NULL) {
1204 lookup = X509_STORE_add_lookup(cert_ctx,
1205 X509_LOOKUP_hash_dir());
1206 if (lookup == NULL) {
1207 BIO_printf(bio_err, "memory allocation failure\n");
1208 goto err;
1209 }
1210 i = X509_LOOKUP_add_dir(lookup, ca_path, X509_FILETYPE_PEM);
1211 if (!i) {
1212 BIO_printf(bio_err, "Error loading directory %s\n",
1213 ca_path);
1214 goto err;
1215 }
1216 }
1217 /* Adding a trusted certificate file source. */
1218 if (ca_file != NULL) {
1219 lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
1220 if (lookup == NULL) {
1221 BIO_printf(bio_err, "memory allocation failure\n");
1222 goto err;
1223 }
1224 i = X509_LOOKUP_load_file(lookup, ca_file, X509_FILETYPE_PEM);
1225 if (!i) {
1226 BIO_printf(bio_err, "Error loading file %s\n", ca_file);
1227 goto err;
1228 }
1229 }
1230 return cert_ctx;
1231 err:
1232 X509_STORE_free(cert_ctx);
1233 return NULL;
1234 }
1235
1236 static int
verify_cb(int ok,X509_STORE_CTX * ctx)1237 verify_cb(int ok, X509_STORE_CTX *ctx)
1238 {
1239 /*
1240 char buf[256];
1241
1242 if (!ok)
1243 {
1244 X509_NAME_oneline(X509_get_subject_name(ctx->current_cert),
1245 buf, sizeof(buf));
1246 printf("%s\n", buf);
1247 printf("error %d at %d depth lookup: %s\n",
1248 ctx->error, ctx->error_depth,
1249 X509_verify_cert_error_string(ctx->error));
1250 }
1251 */
1252
1253 return ok;
1254 }
1255