69ce28039a7be863d29661e4ef171e6f1a02ab84
[openssl.git] / apps / smime.c
1 /* smime.c */
2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3  * project.
4  */
5 /* ====================================================================
6  * Copyright (c) 1999-2004 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 /* S/MIME utility function */
60
61 #include <stdio.h>
62 #include <string.h>
63 #include "apps.h"
64 #include <openssl/crypto.h>
65 #include <openssl/pem.h>
66 #include <openssl/err.h>
67 #include <openssl/x509_vfy.h>
68 #include <openssl/x509v3.h>
69
70 #undef PROG
71 #define PROG smime_main
72 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
73 static int smime_cb(int ok, X509_STORE_CTX *ctx);
74
75 #define SMIME_OP        0x10
76 #define SMIME_IP        0x20
77 #define SMIME_SIGNERS   0x40
78 #define SMIME_ENCRYPT   (1 | SMIME_OP)
79 #define SMIME_DECRYPT   (2 | SMIME_IP)
80 #define SMIME_SIGN      (3 | SMIME_OP | SMIME_SIGNERS)
81 #define SMIME_VERIFY    (4 | SMIME_IP)
82 #define SMIME_PK7OUT    (5 | SMIME_IP | SMIME_OP)
83 #define SMIME_RESIGN    (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
84
85 int MAIN(int, char **);
86
87 int MAIN(int argc, char **argv)
88         {
89         ENGINE *e = NULL;
90         int operation = 0;
91         int ret = 0;
92         char **args;
93         const char *inmode = "r", *outmode = "w";
94         char *infile = NULL, *outfile = NULL;
95         char *signerfile = NULL, *recipfile = NULL;
96         STACK *sksigners = NULL, *skkeys = NULL;
97         char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
98         const EVP_CIPHER *cipher = NULL;
99         PKCS7 *p7 = NULL;
100         X509_STORE *store = NULL;
101         X509 *cert = NULL, *recip = NULL, *signer = NULL;
102         EVP_PKEY *key = NULL;
103         STACK_OF(X509) *encerts = NULL, *other = NULL;
104         BIO *in = NULL, *out = NULL, *indata = NULL;
105         int badarg = 0;
106         int flags = PKCS7_DETACHED;
107         char *to = NULL, *from = NULL, *subject = NULL;
108         char *CAfile = NULL, *CApath = NULL;
109         char *passargin = NULL, *passin = NULL;
110         char *inrand = NULL;
111         int need_rand = 0;
112         const EVP_MD *sign_md = NULL;
113         int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
114         int keyform = FORMAT_PEM;
115 #ifndef OPENSSL_NO_ENGINE
116         char *engine=NULL;
117 #endif
118
119         X509_VERIFY_PARAM *vpm = NULL;
120
121         args = argv + 1;
122         ret = 1;
123
124         apps_startup();
125
126         if (bio_err == NULL)
127                 {
128                 if ((bio_err = BIO_new(BIO_s_file())) != NULL)
129                         BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
130                 }
131
132         if (!load_config(bio_err, NULL))
133                 goto end;
134
135         while (!badarg && *args && *args[0] == '-')
136                 {
137                 if (!strcmp (*args, "-encrypt"))
138                         operation = SMIME_ENCRYPT;
139                 else if (!strcmp (*args, "-decrypt"))
140                         operation = SMIME_DECRYPT;
141                 else if (!strcmp (*args, "-sign"))
142                         operation = SMIME_SIGN;
143                 else if (!strcmp (*args, "-resign"))
144                         operation = SMIME_RESIGN;
145                 else if (!strcmp (*args, "-verify"))
146                         operation = SMIME_VERIFY;
147                 else if (!strcmp (*args, "-pk7out"))
148                         operation = SMIME_PK7OUT;
149 #ifndef OPENSSL_NO_DES
150                 else if (!strcmp (*args, "-des3")) 
151                                 cipher = EVP_des_ede3_cbc();
152                 else if (!strcmp (*args, "-des")) 
153                                 cipher = EVP_des_cbc();
154 #endif
155 #ifndef OPENSSL_NO_RC2
156                 else if (!strcmp (*args, "-rc2-40")) 
157                                 cipher = EVP_rc2_40_cbc();
158                 else if (!strcmp (*args, "-rc2-128")) 
159                                 cipher = EVP_rc2_cbc();
160                 else if (!strcmp (*args, "-rc2-64")) 
161                                 cipher = EVP_rc2_64_cbc();
162 #endif
163 #ifndef OPENSSL_NO_AES
164                 else if (!strcmp(*args,"-aes128"))
165                                 cipher = EVP_aes_128_cbc();
166                 else if (!strcmp(*args,"-aes192"))
167                                 cipher = EVP_aes_192_cbc();
168                 else if (!strcmp(*args,"-aes256"))
169                                 cipher = EVP_aes_256_cbc();
170 #endif
171 #ifndef OPENSSL_NO_CAMELLIA
172                 else if (!strcmp(*args,"-camellia128"))
173                                 cipher = EVP_camellia_128_cbc();
174                 else if (!strcmp(*args,"-camellia192"))
175                                 cipher = EVP_camellia_192_cbc();
176                 else if (!strcmp(*args,"-camellia256"))
177                                 cipher = EVP_camellia_256_cbc();
178 #endif
179                 else if (!strcmp (*args, "-text")) 
180                                 flags |= PKCS7_TEXT;
181                 else if (!strcmp (*args, "-nointern")) 
182                                 flags |= PKCS7_NOINTERN;
183                 else if (!strcmp (*args, "-noverify")) 
184                                 flags |= PKCS7_NOVERIFY;
185                 else if (!strcmp (*args, "-nochain")) 
186                                 flags |= PKCS7_NOCHAIN;
187                 else if (!strcmp (*args, "-nocerts")) 
188                                 flags |= PKCS7_NOCERTS;
189                 else if (!strcmp (*args, "-noattr")) 
190                                 flags |= PKCS7_NOATTR;
191                 else if (!strcmp (*args, "-nodetach")) 
192                                 flags &= ~PKCS7_DETACHED;
193                 else if (!strcmp (*args, "-nosmimecap"))
194                                 flags |= PKCS7_NOSMIMECAP;
195                 else if (!strcmp (*args, "-binary"))
196                                 flags |= PKCS7_BINARY;
197                 else if (!strcmp (*args, "-nosigs"))
198                                 flags |= PKCS7_NOSIGS;
199                 else if (!strcmp (*args, "-nooldmime"))
200                                 flags |= PKCS7_NOOLDMIMETYPE;
201                 else if (!strcmp (*args, "-crlfeol"))
202                                 flags |= PKCS7_CRLFEOL;
203                 else if (!strcmp(*args,"-rand"))
204                         {
205                         if (!args[1])
206                                 goto argerr;
207                         args++;
208                         inrand = *args;
209                         need_rand = 1;
210                         }
211 #ifndef OPENSSL_NO_ENGINE
212                 else if (!strcmp(*args,"-engine"))
213                         {
214                         if (!args[1])
215                                 goto argerr;
216                         engine = *++args;
217                         }
218 #endif
219                 else if (!strcmp(*args,"-passin"))
220                         {
221                         if (!args[1])
222                                 goto argerr;
223                         passargin = *++args;
224                         }
225                 else if (!strcmp (*args, "-to"))
226                         {
227                         if (!args[1])
228                                 goto argerr;
229                         to = *++args;
230                         }
231                 else if (!strcmp (*args, "-from"))
232                         {
233                         if (!args[1])
234                                 goto argerr;
235                         from = *++args;
236                         }
237                 else if (!strcmp (*args, "-subject"))
238                         {
239                         if (!args[1])
240                                 goto argerr;
241                         subject = *++args;
242                         }
243                 else if (!strcmp (*args, "-signer"))
244                         {
245                         if (!args[1])
246                                 goto argerr;
247                         /* If previous -signer argument add signer to list */
248
249                         if (signerfile)
250                                 {
251                                 if (!sksigners)
252                                         sksigners = sk_new_null();
253                                 sk_push(sksigners, signerfile);
254                                 if (!keyfile)
255                                         keyfile = signerfile;
256                                 if (!skkeys)
257                                         skkeys = sk_new_null();
258                                 sk_push(skkeys, keyfile);
259                                 keyfile = NULL;
260                                 }
261                         signerfile = *++args;
262                         }
263                 else if (!strcmp (*args, "-recip"))
264                         {
265                         if (!args[1])
266                                 goto argerr;
267                         recipfile = *++args;
268                         }
269                 else if (!strcmp (*args, "-md"))
270                         {
271                         if (!args[1])
272                                 goto argerr;
273                         sign_md = EVP_get_digestbyname(*++args);
274                         if (sign_md == NULL)
275                                 {
276                                 BIO_printf(bio_err, "Unknown digest %s\n",
277                                                         *args);
278                                 goto argerr;
279                                 }
280                         }
281                 else if (!strcmp (*args, "-inkey"))
282                         {
283                         if (!args[1])   
284                                 goto argerr;
285                         /* If previous -inkey arument add signer to list */
286                         if (keyfile)
287                                 {
288                                 if (!signerfile)
289                                         {
290                                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
291                                         goto argerr;
292                                         }
293                                 if (!sksigners)
294                                         sksigners = sk_new_null();
295                                 sk_push(sksigners, signerfile);
296                                 signerfile = NULL;
297                                 if (!skkeys)
298                                         skkeys = sk_new_null();
299                                 sk_push(skkeys, keyfile);
300                                 }
301                         keyfile = *++args;
302                         }
303                 else if (!strcmp (*args, "-keyform"))
304                         {
305                         if (!args[1])
306                                 goto argerr;
307                         keyform = str2fmt(*++args);
308                         }
309                 else if (!strcmp (*args, "-certfile"))
310                         {
311                         if (!args[1])
312                                 goto argerr;
313                         certfile = *++args;
314                         }
315                 else if (!strcmp (*args, "-CAfile"))
316                         {
317                         if (!args[1])
318                                 goto argerr;
319                         CAfile = *++args;
320                         }
321                 else if (!strcmp (*args, "-CApath"))
322                         {
323                         if (!args[1])
324                                 goto argerr;
325                         CApath = *++args;
326                         }
327                 else if (!strcmp (*args, "-in"))
328                         {
329                         if (!args[1])
330                                 goto argerr;
331                         infile = *++args;
332                         }
333                 else if (!strcmp (*args, "-inform"))
334                         {
335                         if (!args[1])
336                                 goto argerr;
337                         informat = str2fmt(*++args);
338                         }
339                 else if (!strcmp (*args, "-outform"))
340                         {
341                         if (!args[1])
342                                 goto argerr;
343                         outformat = str2fmt(*++args);
344                         }
345                 else if (!strcmp (*args, "-out"))
346                         {
347                         if (!args[1])
348                                 goto argerr;
349                         outfile = *++args;
350                         }
351                 else if (!strcmp (*args, "-content"))
352                         {
353                         if (!args[1])
354                                 goto argerr;
355                         contfile = *++args;
356                         }
357                 else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
358                         continue;
359                 else if ((cipher = EVP_get_cipherbyname(*args + 1)) == NULL)
360                         badarg = 1;
361                 args++;
362                 }
363
364         if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners))
365                 {
366                 BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
367                 goto argerr;
368                 }
369
370         if (operation & SMIME_SIGNERS)
371                 {
372                 /* Check to see if any final signer needs to be appended */
373                 if (keyfile && !signerfile)
374                         {
375                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
376                         goto argerr;
377                         }
378                 if (signerfile)
379                         {
380                         if (!sksigners)
381                                 sksigners = sk_new_null();
382                         sk_push(sksigners, signerfile);
383                         if (!skkeys)
384                                 skkeys = sk_new_null();
385                         if (!keyfile)
386                                 keyfile = signerfile;
387                         sk_push(skkeys, keyfile);
388                         }
389                 if (!sksigners)
390                         {
391                         BIO_printf(bio_err, "No signer certificate specified\n");
392                         badarg = 1;
393                         }
394                 signerfile = NULL;
395                 keyfile = NULL;
396                 need_rand = 1;
397                 }
398         else if (operation == SMIME_DECRYPT)
399                 {
400                 if (!recipfile && !keyfile)
401                         {
402                         BIO_printf(bio_err, "No recipient certificate or key specified\n");
403                         badarg = 1;
404                         }
405                 }
406         else if (operation == SMIME_ENCRYPT)
407                 {
408                 if (!*args)
409                         {
410                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
411                         badarg = 1;
412                         }
413                 need_rand = 1;
414                 }
415         else if (!operation)
416                 badarg = 1;
417
418         if (badarg)
419                 {
420                 argerr:
421                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
422                 BIO_printf (bio_err, "where options are\n");
423                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
424                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
425                 BIO_printf (bio_err, "-sign          sign message\n");
426                 BIO_printf (bio_err, "-verify        verify signed message\n");
427                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
428 #ifndef OPENSSL_NO_DES
429                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
430                 BIO_printf (bio_err, "-des           encrypt with DES\n");
431 #endif
432 #ifndef OPENSSL_NO_RC2
433                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
434                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
435                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
436 #endif
437 #ifndef OPENSSL_NO_AES
438                 BIO_printf (bio_err, "-aes128, -aes192, -aes256\n");
439                 BIO_printf (bio_err, "               encrypt PEM output with cbc aes\n");
440 #endif
441 #ifndef OPENSSL_NO_CAMELLIA
442                 BIO_printf (bio_err, "-camellia128, -camellia192, -camellia256\n");
443                 BIO_printf (bio_err, "               encrypt PEM output with cbc camellia\n");
444 #endif
445                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
446                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
447                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
448                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
449                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
450                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
451                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
452                 BIO_printf (bio_err, "-certfile file other certificates file\n");
453                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
454                 BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
455                 BIO_printf (bio_err, "-in file       input file\n");
456                 BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
457                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
458                 BIO_printf (bio_err, "-keyform arg   input private key format (PEM or ENGINE)\n");
459                 BIO_printf (bio_err, "-out file      output file\n");
460                 BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
461                 BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
462                 BIO_printf (bio_err, "-to addr       to address\n");
463                 BIO_printf (bio_err, "-from ad       from address\n");
464                 BIO_printf (bio_err, "-subject s     subject\n");
465                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
466                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
467                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
468                 BIO_printf (bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
469                 BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
470 #ifndef OPENSSL_NO_ENGINE
471                 BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
472 #endif
473                 BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
474                 BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
475                 BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
476                 BIO_printf(bio_err,  "               the random number generator\n");
477                 BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
478                 goto end;
479                 }
480
481 #ifndef OPENSSL_NO_ENGINE
482         e = setup_engine(bio_err, engine, 0);
483 #endif
484
485         if (!app_passwd(bio_err, passargin, NULL, &passin, NULL))
486                 {
487                 BIO_printf(bio_err, "Error getting password\n");
488                 goto end;
489                 }
490
491         if (need_rand)
492                 {
493                 app_RAND_load_file(NULL, bio_err, (inrand != NULL));
494                 if (inrand != NULL)
495                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
496                                 app_RAND_load_files(inrand));
497                 }
498
499         ret = 2;
500
501         if (!(operation & SMIME_SIGNERS))
502                 flags &= ~PKCS7_DETACHED;
503
504         if (operation & SMIME_OP)
505                 {
506                 if (outformat == FORMAT_ASN1)
507                         outmode = "wb";
508                 }
509         else
510                 {
511                 if (flags & PKCS7_BINARY)
512                         outmode = "wb";
513                 }
514
515         if (operation & SMIME_IP)
516                 {
517                 if (informat == FORMAT_ASN1)
518                         inmode = "rb";
519                 }
520         else
521                 {
522                 if (flags & PKCS7_BINARY)
523                         inmode = "rb";
524                 }
525
526         if (operation == SMIME_ENCRYPT)
527                 {
528                 if (!cipher)
529                         {
530 #ifndef OPENSSL_NO_RC2                  
531                         cipher = EVP_rc2_40_cbc();
532 #else
533                         BIO_printf(bio_err, "No cipher selected\n");
534                         goto end;
535 #endif
536                         }
537                 encerts = sk_X509_new_null();
538                 while (*args)
539                         {
540                         if (!(cert = load_cert(bio_err,*args,FORMAT_PEM,
541                                 NULL, e, "recipient certificate file")))
542                                 {
543 #if 0                           /* An appropriate message is already printed */
544                                 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
545 #endif
546                                 goto end;
547                                 }
548                         sk_X509_push(encerts, cert);
549                         cert = NULL;
550                         args++;
551                         }
552                 }
553
554         if (certfile)
555                 {
556                 if (!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL,
557                         e, "certificate file")))
558                         {
559                         ERR_print_errors(bio_err);
560                         goto end;
561                         }
562                 }
563
564         if (recipfile && (operation == SMIME_DECRYPT))
565                 {
566                 if (!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL,
567                         e, "recipient certificate file")))
568                         {
569                         ERR_print_errors(bio_err);
570                         goto end;
571                         }
572                 }
573
574         if (operation == SMIME_DECRYPT)
575                 {
576                 if (!keyfile)
577                         keyfile = recipfile;
578                 }
579         else if (operation == SMIME_SIGN)
580                 {
581                 if (!keyfile)
582                         keyfile = signerfile;
583                 }
584         else keyfile = NULL;
585
586         if (keyfile)
587                 {
588                 key = load_key(bio_err, keyfile, keyform, 0, passin, e,
589                                "signing key file");
590                 if (!key)
591                         goto end;
592                 }
593
594         if (infile)
595                 {
596                 if (!(in = BIO_new_file(infile, inmode)))
597                         {
598                         BIO_printf (bio_err,
599                                  "Can't open input file %s\n", infile);
600                         goto end;
601                         }
602                 }
603         else
604                 in = BIO_new_fp(stdin, BIO_NOCLOSE);
605
606         if (operation & SMIME_IP)
607                 {
608                 if (informat == FORMAT_SMIME) 
609                         p7 = SMIME_read_PKCS7(in, &indata);
610                 else if (informat == FORMAT_PEM) 
611                         p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
612                 else if (informat == FORMAT_ASN1) 
613                         p7 = d2i_PKCS7_bio(in, NULL);
614                 else
615                         {
616                         BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
617                         goto end;
618                         }
619
620                 if (!p7)
621                         {
622                         BIO_printf(bio_err, "Error reading S/MIME message\n");
623                         goto end;
624                         }
625                 if (contfile)
626                         {
627                         BIO_free(indata);
628                         if (!(indata = BIO_new_file(contfile, "rb")))
629                                 {
630                                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
631                                 goto end;
632                                 }
633                         }
634                 }
635
636         if (outfile)
637                 {
638                 if (!(out = BIO_new_file(outfile, outmode)))
639                         {
640                         BIO_printf (bio_err,
641                                  "Can't open output file %s\n", outfile);
642                         goto end;
643                         }
644                 }
645         else
646                 {
647                 out = BIO_new_fp(stdout, BIO_NOCLOSE);
648 #ifdef OPENSSL_SYS_VMS
649                 {
650                     BIO *tmpbio = BIO_new(BIO_f_linebuffer());
651                     out = BIO_push(tmpbio, out);
652                 }
653 #endif
654                 }
655
656         if (operation == SMIME_VERIFY)
657                 {
658                 if (!(store = setup_verify(bio_err, CAfile, CApath)))
659                         goto end;
660                 X509_STORE_set_verify_cb_func(store, smime_cb);
661                 if (vpm)
662                         X509_STORE_set1_param(store, vpm);
663                 }
664
665
666         ret = 3;
667
668         if (operation == SMIME_ENCRYPT)
669                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
670         else if (operation & SMIME_SIGNERS)
671                 {
672                 int i;
673                 /* If detached data and SMIME output enable partial
674                  * signing.
675                  */
676                 if (operation == SMIME_SIGN)
677                         {
678                         if ((flags & PKCS7_DETACHED)
679                                 && (outformat == FORMAT_SMIME))
680                                 flags |= PKCS7_STREAM;
681                         flags |= PKCS7_PARTIAL;
682                         p7 = PKCS7_sign(NULL, NULL, other, in, flags);
683                         }
684                 else
685                         flags |= PKCS7_REUSE_DIGEST;
686                 for (i = 0; i < sk_num(sksigners); i++)
687                         {
688                         signerfile = sk_value(sksigners, i);
689                         keyfile = sk_value(skkeys, i);
690                         signer = load_cert(bio_err, signerfile,FORMAT_PEM, NULL,
691                                         e, "signer certificate");
692                         if (!signer)
693                                 goto end;
694                         key = load_key(bio_err, keyfile, keyform, 0, passin, e,
695                                "signing key file");
696                         if (!key)
697                                 goto end;
698                         if (!PKCS7_sign_add_signer(p7, signer, key,
699                                                 sign_md, flags))
700                                 goto end;
701                         X509_free(signer);
702                         signer = NULL;
703                         EVP_PKEY_free(key);
704                         key = NULL;
705                         }
706                 /* If not streaming or resigning finalize structure */
707                 if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM))
708                         {
709                         if (!PKCS7_final(p7, in, flags))
710                                 goto end;
711                         if (BIO_reset(in) != 0)
712                                 {
713                                 BIO_puts(bio_err, "Can't rewind input file\n");
714                                 goto end;
715                                 }
716                         }
717                 }
718
719         if (!p7)
720                 {
721                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
722                 goto end;
723                 }
724
725         ret = 4;
726         if (operation == SMIME_DECRYPT)
727                 {
728                 if (!PKCS7_decrypt(p7, key, recip, out, flags))
729                         {
730                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
731                         goto end;
732                         }
733                 }
734         else if (operation == SMIME_VERIFY)
735                 {
736                 STACK_OF(X509) *signers;
737                 if (PKCS7_verify(p7, other, store, indata, out, flags))
738                         BIO_printf(bio_err, "Verification successful\n");
739                 else
740                         {
741                         BIO_printf(bio_err, "Verification failure\n");
742                         goto end;
743                         }
744                 signers = PKCS7_get0_signers(p7, other, flags);
745                 if (!save_certs(signerfile, signers))
746                         {
747                         BIO_printf(bio_err, "Error writing signers to %s\n",
748                                                                 signerfile);
749                         ret = 5;
750                         goto end;
751                         }
752                 sk_X509_free(signers);
753                 }
754         else if (operation == SMIME_PK7OUT)
755                 PEM_write_bio_PKCS7(out, p7);
756         else
757                 {
758                 if (to)
759                         BIO_printf(out, "To: %s\n", to);
760                 if (from)
761                         BIO_printf(out, "From: %s\n", from);
762                 if (subject)
763                         BIO_printf(out, "Subject: %s\n", subject);
764                 if (outformat == FORMAT_SMIME) 
765                         {
766                         if (operation == SMIME_RESIGN)
767                                 SMIME_write_PKCS7(out, p7, indata, flags);
768                         else
769                                 SMIME_write_PKCS7(out, p7, in, flags);
770                         }
771                 else if (outformat == FORMAT_PEM) 
772                         PEM_write_bio_PKCS7(out,p7);
773                 else if (outformat == FORMAT_ASN1) 
774                         i2d_PKCS7_bio(out,p7);
775                 else
776                         {
777                         BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
778                         goto end;
779                         }
780                 }
781         ret = 0;
782 end:
783         if (need_rand)
784                 app_RAND_write_file(NULL, bio_err);
785         if (ret) ERR_print_errors(bio_err);
786         sk_X509_pop_free(encerts, X509_free);
787         sk_X509_pop_free(other, X509_free);
788         if (vpm)
789                 X509_VERIFY_PARAM_free(vpm);
790         if (sksigners)
791                 sk_free(sksigners);
792         if (skkeys)
793                 sk_free(skkeys);
794         X509_STORE_free(store);
795         X509_free(cert);
796         X509_free(recip);
797         X509_free(signer);
798         EVP_PKEY_free(key);
799         PKCS7_free(p7);
800         BIO_free(in);
801         BIO_free(indata);
802         BIO_free_all(out);
803         if (passin) OPENSSL_free(passin);
804         return (ret);
805 }
806
807 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
808         {
809         int i;
810         BIO *tmp;
811         if (!signerfile)
812                 return 1;
813         tmp = BIO_new_file(signerfile, "w");
814         if (!tmp) return 0;
815         for(i = 0; i < sk_X509_num(signers); i++)
816                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
817         BIO_free(tmp);
818         return 1;
819         }
820         
821
822 /* Minimal callback just to output policy info (if any) */
823
824 static int smime_cb(int ok, X509_STORE_CTX *ctx)
825         {
826         int error;
827
828         error = X509_STORE_CTX_get_error(ctx);
829
830         if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
831                 && ((error != X509_V_OK) || (ok != 2)))
832                 return ok;
833
834         policies_print(NULL, ctx);
835
836         return ok;
837
838         }