1 /*
2 * Copyright 1999-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /* S/MIME utility function */
11
12 #include <stdio.h>
13 #include <string.h>
14 #include "apps.h"
15 #include "progs.h"
16 #include <openssl/crypto.h>
17 #include <openssl/pem.h>
18 #include <openssl/err.h>
19 #include <openssl/x509_vfy.h>
20 #include <openssl/x509v3.h>
21
22 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
23 static int smime_cb(int ok, X509_STORE_CTX *ctx);
24
25 #define SMIME_OP 0x10
26 #define SMIME_IP 0x20
27 #define SMIME_SIGNERS 0x40
28 #define SMIME_ENCRYPT (1 | SMIME_OP)
29 #define SMIME_DECRYPT (2 | SMIME_IP)
30 #define SMIME_SIGN (3 | SMIME_OP | SMIME_SIGNERS)
31 #define SMIME_RESIGN (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
32 #define SMIME_VERIFY (4 | SMIME_IP)
33 #define SMIME_PK7OUT (5 | SMIME_IP | SMIME_OP)
34
35 typedef enum OPTION_choice {
36 OPT_COMMON,
37 OPT_ENCRYPT, OPT_DECRYPT, OPT_SIGN, OPT_RESIGN, OPT_VERIFY,
38 OPT_PK7OUT, OPT_TEXT, OPT_NOINTERN, OPT_NOVERIFY, OPT_NOCHAIN,
39 OPT_NOCERTS, OPT_NOATTR, OPT_NODETACH, OPT_NOSMIMECAP,
40 OPT_BINARY, OPT_NOSIGS, OPT_STREAM, OPT_INDEF, OPT_NOINDEF,
41 OPT_CRLFEOL, OPT_ENGINE, OPT_PASSIN,
42 OPT_TO, OPT_FROM, OPT_SUBJECT, OPT_SIGNER, OPT_RECIP, OPT_MD,
43 OPT_CIPHER, OPT_INKEY, OPT_KEYFORM, OPT_CERTFILE, OPT_CAFILE,
44 OPT_CAPATH, OPT_CASTORE, OPT_NOCAFILE, OPT_NOCAPATH, OPT_NOCASTORE,
45 OPT_R_ENUM, OPT_PROV_ENUM, OPT_CONFIG,
46 OPT_V_ENUM,
47 OPT_IN, OPT_INFORM, OPT_OUT,
48 OPT_OUTFORM, OPT_CONTENT
49 } OPTION_CHOICE;
50
51 const OPTIONS smime_options[] = {
52 {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert...]\n"},
53
54 OPT_SECTION("General"),
55 {"help", OPT_HELP, '-', "Display this summary"},
56 {"in", OPT_IN, '<', "Input file"},
57 {"inform", OPT_INFORM, 'c', "Input format SMIME (default), PEM or DER"},
58 {"out", OPT_OUT, '>', "Output file"},
59 {"outform", OPT_OUTFORM, 'c',
60 "Output format SMIME (default), PEM or DER"},
61 {"inkey", OPT_INKEY, 's',
62 "Input private key (if not signer or recipient)"},
63 {"keyform", OPT_KEYFORM, 'f', "Input private key format (ENGINE, other values ignored)"},
64 #ifndef OPENSSL_NO_ENGINE
65 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
66 #endif
67 {"stream", OPT_STREAM, '-', "Enable CMS streaming" },
68 {"indef", OPT_INDEF, '-', "Same as -stream" },
69 {"noindef", OPT_NOINDEF, '-', "Disable CMS streaming"},
70 OPT_CONFIG_OPTION,
71
72 OPT_SECTION("Action"),
73 {"encrypt", OPT_ENCRYPT, '-', "Encrypt message"},
74 {"decrypt", OPT_DECRYPT, '-', "Decrypt encrypted message"},
75 {"sign", OPT_SIGN, '-', "Sign message"},
76 {"resign", OPT_RESIGN, '-', "Resign a signed message"},
77 {"verify", OPT_VERIFY, '-', "Verify signed message"},
78 {"pk7out", OPT_PK7OUT, '-', "Output PKCS#7 structure"},
79
80 OPT_SECTION("Signing/Encryption"),
81 {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
82 {"md", OPT_MD, 's', "Digest algorithm to use when signing or resigning"},
83 {"", OPT_CIPHER, '-', "Any supported cipher"},
84 {"nointern", OPT_NOINTERN, '-',
85 "Don't search certificates in message for signer"},
86 {"nodetach", OPT_NODETACH, '-', "Use opaque signing"},
87 {"noattr", OPT_NOATTR, '-', "Don't include any signed attributes"},
88 {"binary", OPT_BINARY, '-', "Don't translate message to text"},
89 {"signer", OPT_SIGNER, 's', "Signer certificate file"},
90 {"content", OPT_CONTENT, '<',
91 "Supply or override content for detached signature"},
92 {"nocerts", OPT_NOCERTS, '-',
93 "Don't include signers certificate when signing"},
94
95 OPT_SECTION("Verification/Decryption"),
96 {"nosigs", OPT_NOSIGS, '-', "Don't verify message signature"},
97 {"noverify", OPT_NOVERIFY, '-', "Don't verify signers certificate"},
98
99 {"certfile", OPT_CERTFILE, '<',
100 "Extra signer and intermediate CA certificates to include when signing"},
101 {OPT_MORE_STR, 0, 0,
102 "or to use as preferred signer certs and for chain building when verifying"},
103 {"recip", OPT_RECIP, '<', "Recipient certificate file for decryption"},
104
105 OPT_SECTION("Email"),
106 {"to", OPT_TO, 's', "To address"},
107 {"from", OPT_FROM, 's', "From address"},
108 {"subject", OPT_SUBJECT, 's', "Subject"},
109 {"text", OPT_TEXT, '-', "Include or delete text MIME headers"},
110 {"nosmimecap", OPT_NOSMIMECAP, '-', "Omit the SMIMECapabilities attribute"},
111
112 OPT_SECTION("Certificate chain"),
113 {"CApath", OPT_CAPATH, '/', "Trusted certificates directory"},
114 {"CAfile", OPT_CAFILE, '<', "Trusted certificates file"},
115 {"CAstore", OPT_CASTORE, ':', "Trusted certificates store URI"},
116 {"no-CAfile", OPT_NOCAFILE, '-',
117 "Do not load the default certificates file"},
118 {"no-CApath", OPT_NOCAPATH, '-',
119 "Do not load certificates from the default certificates directory"},
120 {"no-CAstore", OPT_NOCASTORE, '-',
121 "Do not load certificates from the default certificates store"},
122 {"nochain", OPT_NOCHAIN, '-',
123 "set PKCS7_NOCHAIN so certificates contained in the message are not used as untrusted CAs" },
124 {"crlfeol", OPT_CRLFEOL, '-', "Use CRLF as EOL termination instead of LF only"},
125
126 OPT_R_OPTIONS,
127 OPT_V_OPTIONS,
128 OPT_PROV_OPTIONS,
129
130 OPT_PARAMETERS(),
131 {"cert", 0, 0, "Recipient certs, used when encrypting"},
132 {NULL}
133 };
134
operation_name(int operation)135 static const char *operation_name(int operation)
136 {
137 switch (operation) {
138 case SMIME_ENCRYPT:
139 return "encrypt";
140 case SMIME_DECRYPT:
141 return "decrypt";
142 case SMIME_SIGN:
143 return "sign";
144 case SMIME_RESIGN:
145 return "resign";
146 case SMIME_VERIFY:
147 return "verify";
148 case SMIME_PK7OUT:
149 return "pk7out";
150 default:
151 return "(invalid operation)";
152 }
153 }
154
155 #define SET_OPERATION(op) \
156 ((operation != 0 && (operation != (op))) \
157 ? 0 * BIO_printf(bio_err, "%s: Cannot use -%s together with -%s\n", \
158 prog, operation_name(op), operation_name(operation)) \
159 : (operation = (op)))
160
smime_main(int argc,char ** argv)161 int smime_main(int argc, char **argv)
162 {
163 CONF *conf = NULL;
164 BIO *in = NULL, *out = NULL, *indata = NULL;
165 EVP_PKEY *key = NULL;
166 PKCS7 *p7 = NULL;
167 STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
168 STACK_OF(X509) *encerts = NULL, *other = NULL;
169 X509 *cert = NULL, *recip = NULL, *signer = NULL;
170 X509_STORE *store = NULL;
171 X509_VERIFY_PARAM *vpm = NULL;
172 EVP_CIPHER *cipher = NULL;
173 EVP_MD *sign_md = NULL;
174 const char *CAfile = NULL, *CApath = NULL, *CAstore = NULL, *prog = NULL;
175 char *certfile = NULL, *keyfile = NULL, *contfile = NULL;
176 char *infile = NULL, *outfile = NULL, *signerfile = NULL, *recipfile = NULL;
177 char *passinarg = NULL, *passin = NULL, *to = NULL, *from = NULL;
178 char *subject = NULL, *digestname = NULL, *ciphername = NULL;
179 OPTION_CHOICE o;
180 int noCApath = 0, noCAfile = 0, noCAstore = 0;
181 int flags = PKCS7_DETACHED, operation = 0, ret = 0, indef = 0;
182 int informat = FORMAT_SMIME, outformat = FORMAT_SMIME, keyform =
183 FORMAT_UNDEF;
184 int vpmtouched = 0, rv = 0;
185 ENGINE *e = NULL;
186 const char *mime_eol = "\n";
187 OSSL_LIB_CTX *libctx = app_get0_libctx();
188
189 if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
190 return 1;
191
192 opt_set_unknown_name("cipher");
193 prog = opt_init(argc, argv, smime_options);
194 while ((o = opt_next()) != OPT_EOF) {
195 switch (o) {
196 case OPT_EOF:
197 case OPT_ERR:
198 opthelp:
199 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
200 goto end;
201 case OPT_HELP:
202 opt_help(smime_options);
203 ret = 0;
204 goto end;
205 case OPT_INFORM:
206 if (!opt_format(opt_arg(), OPT_FMT_PDS, &informat))
207 goto opthelp;
208 break;
209 case OPT_IN:
210 infile = opt_arg();
211 break;
212 case OPT_OUTFORM:
213 if (!opt_format(opt_arg(), OPT_FMT_PDS, &outformat))
214 goto opthelp;
215 break;
216 case OPT_OUT:
217 outfile = opt_arg();
218 break;
219 case OPT_ENCRYPT:
220 if (!SET_OPERATION(SMIME_ENCRYPT))
221 goto end;
222 break;
223 case OPT_DECRYPT:
224 if (!SET_OPERATION(SMIME_DECRYPT))
225 goto end;
226 break;
227 case OPT_SIGN:
228 if (!SET_OPERATION(SMIME_SIGN))
229 goto end;
230 break;
231 case OPT_RESIGN:
232 if (!SET_OPERATION(SMIME_RESIGN))
233 goto end;
234 break;
235 case OPT_VERIFY:
236 if (!SET_OPERATION(SMIME_VERIFY))
237 goto end;
238 break;
239 case OPT_PK7OUT:
240 if (!SET_OPERATION(SMIME_PK7OUT))
241 goto end;
242 break;
243 case OPT_TEXT:
244 flags |= PKCS7_TEXT;
245 break;
246 case OPT_NOINTERN:
247 flags |= PKCS7_NOINTERN;
248 break;
249 case OPT_NOVERIFY:
250 flags |= PKCS7_NOVERIFY;
251 break;
252 case OPT_NOCHAIN:
253 flags |= PKCS7_NOCHAIN;
254 break;
255 case OPT_NOCERTS:
256 flags |= PKCS7_NOCERTS;
257 break;
258 case OPT_NOATTR:
259 flags |= PKCS7_NOATTR;
260 break;
261 case OPT_NODETACH:
262 flags &= ~PKCS7_DETACHED;
263 break;
264 case OPT_NOSMIMECAP:
265 flags |= PKCS7_NOSMIMECAP;
266 break;
267 case OPT_BINARY:
268 flags |= PKCS7_BINARY;
269 break;
270 case OPT_NOSIGS:
271 flags |= PKCS7_NOSIGS;
272 break;
273 case OPT_STREAM:
274 case OPT_INDEF:
275 indef = 1;
276 break;
277 case OPT_NOINDEF:
278 indef = 0;
279 break;
280 case OPT_CRLFEOL:
281 flags |= PKCS7_CRLFEOL;
282 mime_eol = "\r\n";
283 break;
284 case OPT_R_CASES:
285 if (!opt_rand(o))
286 goto end;
287 break;
288 case OPT_PROV_CASES:
289 if (!opt_provider(o))
290 goto end;
291 break;
292 case OPT_CONFIG:
293 conf = app_load_config_modules(opt_arg());
294 if (conf == NULL)
295 goto end;
296 break;
297 case OPT_ENGINE:
298 e = setup_engine(opt_arg(), 0);
299 break;
300 case OPT_PASSIN:
301 passinarg = opt_arg();
302 break;
303 case OPT_TO:
304 to = opt_arg();
305 break;
306 case OPT_FROM:
307 from = opt_arg();
308 break;
309 case OPT_SUBJECT:
310 subject = opt_arg();
311 break;
312 case OPT_SIGNER:
313 /* If previous -signer argument add signer to list */
314 if (signerfile != NULL) {
315 if (sksigners == NULL
316 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
317 goto end;
318 sk_OPENSSL_STRING_push(sksigners, signerfile);
319 if (keyfile == NULL)
320 keyfile = signerfile;
321 if (skkeys == NULL
322 && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
323 goto end;
324 sk_OPENSSL_STRING_push(skkeys, keyfile);
325 keyfile = NULL;
326 }
327 signerfile = opt_arg();
328 break;
329 case OPT_RECIP:
330 recipfile = opt_arg();
331 break;
332 case OPT_MD:
333 digestname = opt_arg();
334 break;
335 case OPT_CIPHER:
336 ciphername = opt_unknown();
337 break;
338 case OPT_INKEY:
339 /* If previous -inkey argument add signer to list */
340 if (keyfile != NULL) {
341 if (signerfile == NULL) {
342 BIO_printf(bio_err,
343 "%s: Must have -signer before -inkey\n", prog);
344 goto opthelp;
345 }
346 if (sksigners == NULL
347 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
348 goto end;
349 sk_OPENSSL_STRING_push(sksigners, signerfile);
350 signerfile = NULL;
351 if (skkeys == NULL
352 && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
353 goto end;
354 sk_OPENSSL_STRING_push(skkeys, keyfile);
355 }
356 keyfile = opt_arg();
357 break;
358 case OPT_KEYFORM:
359 if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
360 goto opthelp;
361 break;
362 case OPT_CERTFILE:
363 certfile = opt_arg();
364 break;
365 case OPT_CAFILE:
366 CAfile = opt_arg();
367 break;
368 case OPT_CAPATH:
369 CApath = opt_arg();
370 break;
371 case OPT_CASTORE:
372 CAstore = opt_arg();
373 break;
374 case OPT_NOCAFILE:
375 noCAfile = 1;
376 break;
377 case OPT_NOCAPATH:
378 noCApath = 1;
379 break;
380 case OPT_NOCASTORE:
381 noCAstore = 1;
382 break;
383 case OPT_CONTENT:
384 contfile = opt_arg();
385 break;
386 case OPT_V_CASES:
387 if (!opt_verify(o, vpm))
388 goto opthelp;
389 vpmtouched++;
390 break;
391 }
392 }
393
394 /* Extra arguments are files with recipient keys. */
395 argc = opt_num_rest();
396 argv = opt_rest();
397
398 if (!app_RAND_load())
399 goto end;
400
401 if (digestname != NULL) {
402 if (!opt_md(digestname, &sign_md))
403 goto opthelp;
404 }
405 if (!opt_cipher_any(ciphername, &cipher))
406 goto opthelp;
407 if (!(operation & SMIME_SIGNERS) && (skkeys != NULL || sksigners != NULL)) {
408 BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
409 goto opthelp;
410 }
411 if (!operation) {
412 BIO_puts(bio_err,
413 "No operation (-encrypt|-sign|...) specified\n");
414 goto opthelp;
415 }
416
417 if (operation & SMIME_SIGNERS) {
418 /* Check to see if any final signer needs to be appended */
419 if (keyfile && !signerfile) {
420 BIO_puts(bio_err, "Illegal -inkey without -signer\n");
421 goto opthelp;
422 }
423 if (signerfile != NULL) {
424 if (sksigners == NULL
425 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
426 goto end;
427 sk_OPENSSL_STRING_push(sksigners, signerfile);
428 if (!skkeys && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
429 goto end;
430 if (!keyfile)
431 keyfile = signerfile;
432 sk_OPENSSL_STRING_push(skkeys, keyfile);
433 }
434 if (sksigners == NULL) {
435 BIO_printf(bio_err, "No signer certificate specified\n");
436 goto opthelp;
437 }
438 signerfile = NULL;
439 keyfile = NULL;
440 } else if (operation == SMIME_DECRYPT) {
441 if (recipfile == NULL && keyfile == NULL) {
442 BIO_printf(bio_err,
443 "No recipient certificate or key specified\n");
444 goto opthelp;
445 }
446 } else if (operation == SMIME_ENCRYPT) {
447 if (argc == 0) {
448 BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
449 goto opthelp;
450 }
451 }
452
453 if (!app_passwd(passinarg, NULL, &passin, NULL)) {
454 BIO_printf(bio_err, "Error getting password\n");
455 goto end;
456 }
457
458 ret = 2;
459
460 if (!(operation & SMIME_SIGNERS))
461 flags &= ~PKCS7_DETACHED;
462
463 if (!(operation & SMIME_OP)) {
464 if (flags & PKCS7_BINARY)
465 outformat = FORMAT_BINARY;
466 }
467
468 if (!(operation & SMIME_IP)) {
469 if (flags & PKCS7_BINARY)
470 informat = FORMAT_BINARY;
471 }
472
473 if (operation == SMIME_ENCRYPT) {
474 if (cipher == NULL)
475 cipher = (EVP_CIPHER *)EVP_aes_256_cbc();
476 encerts = sk_X509_new_null();
477 if (encerts == NULL)
478 goto end;
479 while (*argv != NULL) {
480 cert = load_cert(*argv, FORMAT_UNDEF,
481 "recipient certificate file");
482 if (cert == NULL)
483 goto end;
484 if (!sk_X509_push(encerts, cert))
485 goto end;
486 cert = NULL;
487 argv++;
488 }
489 }
490
491 if (certfile != NULL) {
492 if (!load_certs(certfile, 0, &other, NULL, "certificates")) {
493 ERR_print_errors(bio_err);
494 goto end;
495 }
496 }
497
498 if (recipfile != NULL && (operation == SMIME_DECRYPT)) {
499 if ((recip = load_cert(recipfile, FORMAT_UNDEF,
500 "recipient certificate file")) == NULL) {
501 ERR_print_errors(bio_err);
502 goto end;
503 }
504 }
505
506 if (operation == SMIME_DECRYPT) {
507 if (keyfile == NULL)
508 keyfile = recipfile;
509 } else if (operation == SMIME_SIGN) {
510 if (keyfile == NULL)
511 keyfile = signerfile;
512 } else {
513 keyfile = NULL;
514 }
515
516 if (keyfile != NULL) {
517 key = load_key(keyfile, keyform, 0, passin, e, "signing key");
518 if (key == NULL)
519 goto end;
520 }
521
522 in = bio_open_default(infile, 'r', informat);
523 if (in == NULL)
524 goto end;
525
526 if (operation & SMIME_IP) {
527 PKCS7 *p7_in = NULL;
528
529 p7 = PKCS7_new_ex(libctx, app_get0_propq());
530 if (p7 == NULL) {
531 BIO_printf(bio_err, "Error allocating PKCS7 object\n");
532 goto end;
533 }
534 if (informat == FORMAT_SMIME) {
535 p7_in = SMIME_read_PKCS7_ex(in, &indata, &p7);
536 } else if (informat == FORMAT_PEM) {
537 p7_in = PEM_read_bio_PKCS7(in, &p7, NULL, NULL);
538 } else if (informat == FORMAT_ASN1) {
539 p7_in = d2i_PKCS7_bio(in, &p7);
540 } else {
541 BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
542 goto end;
543 }
544
545 if (p7_in == NULL) {
546 BIO_printf(bio_err, "Error reading S/MIME message\n");
547 goto end;
548 }
549 if (contfile != NULL) {
550 BIO_free(indata);
551 if ((indata = BIO_new_file(contfile, "rb")) == NULL) {
552 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
553 goto end;
554 }
555 }
556 }
557
558 out = bio_open_default(outfile, 'w', outformat);
559 if (out == NULL)
560 goto end;
561
562 if (operation == SMIME_VERIFY) {
563 if ((store = setup_verify(CAfile, noCAfile, CApath, noCApath,
564 CAstore, noCAstore)) == NULL)
565 goto end;
566 X509_STORE_set_verify_cb(store, smime_cb);
567 if (vpmtouched)
568 X509_STORE_set1_param(store, vpm);
569 }
570
571 ret = 3;
572
573 if (operation == SMIME_ENCRYPT) {
574 if (indef)
575 flags |= PKCS7_STREAM;
576 p7 = PKCS7_encrypt_ex(encerts, in, cipher, flags, libctx, app_get0_propq());
577 } else if (operation & SMIME_SIGNERS) {
578 int i;
579 /*
580 * If detached data content we only enable streaming if S/MIME output
581 * format.
582 */
583 if (operation == SMIME_SIGN) {
584 if (flags & PKCS7_DETACHED) {
585 if (outformat == FORMAT_SMIME)
586 flags |= PKCS7_STREAM;
587 } else if (indef) {
588 flags |= PKCS7_STREAM;
589 }
590 flags |= PKCS7_PARTIAL;
591 p7 = PKCS7_sign_ex(NULL, NULL, other, in, flags, libctx, app_get0_propq());
592 if (p7 == NULL)
593 goto end;
594 if (flags & PKCS7_NOCERTS) {
595 for (i = 0; i < sk_X509_num(other); i++) {
596 X509 *x = sk_X509_value(other, i);
597 PKCS7_add_certificate(p7, x);
598 }
599 }
600 } else {
601 flags |= PKCS7_REUSE_DIGEST;
602 }
603 for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
604 signerfile = sk_OPENSSL_STRING_value(sksigners, i);
605 keyfile = sk_OPENSSL_STRING_value(skkeys, i);
606 signer = load_cert(signerfile, FORMAT_UNDEF, "signer certificate");
607 if (signer == NULL)
608 goto end;
609 key = load_key(keyfile, keyform, 0, passin, e, "signing key");
610 if (key == NULL)
611 goto end;
612
613 if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
614 goto end;
615 X509_free(signer);
616 signer = NULL;
617 EVP_PKEY_free(key);
618 key = NULL;
619 }
620 /* If not streaming or resigning finalize structure */
621 if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
622 if (!PKCS7_final(p7, in, flags))
623 goto end;
624 }
625 }
626
627 if (p7 == NULL) {
628 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
629 goto end;
630 }
631
632 ret = 4;
633 if (operation == SMIME_DECRYPT) {
634 if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
635 BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
636 goto end;
637 }
638 } else if (operation == SMIME_VERIFY) {
639 STACK_OF(X509) *signers;
640 if (PKCS7_verify(p7, other, store, indata, out, flags))
641 BIO_printf(bio_err, "Verification successful\n");
642 else {
643 BIO_printf(bio_err, "Verification failure\n");
644 goto end;
645 }
646 signers = PKCS7_get0_signers(p7, other, flags);
647 if (!save_certs(signerfile, signers)) {
648 BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
649 ret = 5;
650 goto end;
651 }
652 sk_X509_free(signers);
653 } else if (operation == SMIME_PK7OUT) {
654 PEM_write_bio_PKCS7(out, p7);
655 } else {
656 if (to)
657 BIO_printf(out, "To: %s%s", to, mime_eol);
658 if (from)
659 BIO_printf(out, "From: %s%s", from, mime_eol);
660 if (subject)
661 BIO_printf(out, "Subject: %s%s", subject, mime_eol);
662 if (outformat == FORMAT_SMIME) {
663 if (operation == SMIME_RESIGN)
664 rv = SMIME_write_PKCS7(out, p7, indata, flags);
665 else
666 rv = SMIME_write_PKCS7(out, p7, in, flags);
667 } else if (outformat == FORMAT_PEM) {
668 rv = PEM_write_bio_PKCS7_stream(out, p7, in, flags);
669 } else if (outformat == FORMAT_ASN1) {
670 rv = i2d_PKCS7_bio_stream(out, p7, in, flags);
671 } else {
672 BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
673 goto end;
674 }
675 if (rv == 0) {
676 BIO_printf(bio_err, "Error writing output\n");
677 ret = 3;
678 goto end;
679 }
680 }
681 ret = 0;
682 end:
683 if (ret)
684 ERR_print_errors(bio_err);
685 OSSL_STACK_OF_X509_free(encerts);
686 OSSL_STACK_OF_X509_free(other);
687 X509_VERIFY_PARAM_free(vpm);
688 sk_OPENSSL_STRING_free(sksigners);
689 sk_OPENSSL_STRING_free(skkeys);
690 X509_STORE_free(store);
691 X509_free(cert);
692 X509_free(recip);
693 X509_free(signer);
694 EVP_PKEY_free(key);
695 EVP_MD_free(sign_md);
696 EVP_CIPHER_free(cipher);
697 PKCS7_free(p7);
698 release_engine(e);
699 BIO_free(in);
700 BIO_free(indata);
701 BIO_free_all(out);
702 OPENSSL_free(passin);
703 NCONF_free(conf);
704 return ret;
705 }
706
save_certs(char * signerfile,STACK_OF (X509)* signers)707 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
708 {
709 int i;
710 BIO *tmp;
711
712 if (signerfile == NULL)
713 return 1;
714 tmp = BIO_new_file(signerfile, "w");
715 if (tmp == NULL)
716 return 0;
717 for (i = 0; i < sk_X509_num(signers); i++)
718 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
719 BIO_free(tmp);
720 return 1;
721 }
722
723 /* Minimal callback just to output policy info (if any) */
724
smime_cb(int ok,X509_STORE_CTX * ctx)725 static int smime_cb(int ok, X509_STORE_CTX *ctx)
726 {
727 int error;
728
729 error = X509_STORE_CTX_get_error(ctx);
730
731 if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
732 && ((error != X509_V_OK) || (ok != 2)))
733 return ok;
734
735 policies_print(ctx);
736
737 return ok;
738 }
739
