b170fe285d48920be2a8bbc0c66717c830b2d2b5
[openssl.git] / crypto / pkcs7 / pk7_smime.c
1 /* pk7_smime.c */
2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3  * project.
4  */
5 /* ====================================================================
6  * Copyright (c) 1999-2003 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 /* Simple PKCS#7 processing functions */
60
61 #include <stdio.h>
62 #include "cryptlib.h"
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.h>
65
66 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
67                   BIO *data, int flags)
68 {
69         PKCS7 *p7;
70         PKCS7_SIGNER_INFO *si;
71         BIO *p7bio;
72         STACK_OF(X509_ALGOR) *smcap;
73         int i;
74
75         if(!X509_check_private_key(signcert, pkey)) {
76                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
77                 return NULL;
78         }
79
80         if(!(p7 = PKCS7_new())) {
81                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
82                 return NULL;
83         }
84
85         PKCS7_set_type(p7, NID_pkcs7_signed);
86
87         PKCS7_content_new(p7, NID_pkcs7_data);
88
89         if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) {
90                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
91                 return NULL;
92         }
93
94         if(!(flags & PKCS7_NOCERTS)) {
95                 PKCS7_add_certificate(p7, signcert);
96                 if(certs) for(i = 0; i < sk_X509_num(certs); i++)
97                         PKCS7_add_certificate(p7, sk_X509_value(certs, i));
98         }
99
100         if(!(flags & PKCS7_NOATTR)) {
101                 PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
102                                 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data));
103                 /* Add SMIMECapabilities */
104                 if(!(flags & PKCS7_NOSMIMECAP))
105                 {
106                 if(!(smcap = sk_X509_ALGOR_new_null())) {
107                         PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
108                         return NULL;
109                 }
110 #ifndef OPENSSL_NO_DES
111                 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1);
112 #endif
113 #ifndef OPENSSL_NO_RC2
114                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
115                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
116 #endif
117 #ifndef OPENSSL_NO_DES
118                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
119 #endif
120 #ifndef OPENSSL_NO_RC2
121                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
122 #endif
123                 PKCS7_add_attrib_smimecap (si, smcap);
124                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
125                 }
126         }
127
128         if (flags & PKCS7_PARTSIGN)
129                 return p7;
130
131         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
132                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
133                 return NULL;
134         }
135
136         SMIME_crlf_copy(data, p7bio, flags);
137
138         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
139
140         if (!PKCS7_dataFinal(p7,p7bio)) {
141                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
142                 return NULL;
143         }
144
145         BIO_free_all(p7bio);
146         return p7;
147 }
148
149 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
150                                         BIO *indata, BIO *out, int flags)
151 {
152         STACK_OF(X509) *signers;
153         X509 *signer;
154         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
155         PKCS7_SIGNER_INFO *si;
156         X509_STORE_CTX cert_ctx;
157         char buf[4096];
158         int i, j=0, k, ret = 0;
159         BIO *p7bio;
160         BIO *tmpout;
161
162         if(!p7) {
163                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
164                 return 0;
165         }
166
167         if(!PKCS7_type_is_signed(p7)) {
168                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
169                 return 0;
170         }
171
172         /* Check for no data and no content: no data to verify signature */
173         if(PKCS7_get_detached(p7) && !indata) {
174                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
175                 return 0;
176         }
177 #if 0
178         /* NB: this test commented out because some versions of Netscape
179          * illegally include zero length content when signing data.
180          */
181
182         /* Check for data and content: two sets of data */
183         if(!PKCS7_get_detached(p7) && indata) {
184                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
185                 return 0;
186         }
187 #endif
188
189         sinfos = PKCS7_get_signer_info(p7);
190
191         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
192                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
193                 return 0;
194         }
195
196
197         signers = PKCS7_get0_signers(p7, certs, flags);
198
199         if(!signers) return 0;
200
201         /* Now verify the certificates */
202
203         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
204                 signer = sk_X509_value (signers, k);
205                 if (!(flags & PKCS7_NOCHAIN)) {
206                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
207                                                         p7->d.sign->cert))
208                                 {
209                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
210                                 sk_X509_free(signers);
211                                 return 0;
212                                 }
213                         X509_STORE_CTX_set_purpose(&cert_ctx,
214                                                 X509_PURPOSE_SMIME_SIGN);
215                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
216                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
217                         sk_X509_free(signers);
218                         return 0;
219                 }
220                 i = X509_verify_cert(&cert_ctx);
221                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
222                 X509_STORE_CTX_cleanup(&cert_ctx);
223                 if (i <= 0) {
224                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
225                         ERR_add_error_data(2, "Verify error:",
226                                          X509_verify_cert_error_string(j));
227                         sk_X509_free(signers);
228                         return 0;
229                 }
230                 /* Check for revocation status here */
231         }
232
233         p7bio=PKCS7_dataInit(p7,indata);
234
235         if(flags & PKCS7_TEXT) {
236                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
237                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
238                         goto err;
239                 }
240         } else tmpout = out;
241
242         /* We now have to 'read' from p7bio to calculate digests etc. */
243         for (;;)
244         {
245                 i=BIO_read(p7bio,buf,sizeof(buf));
246                 if (i <= 0) break;
247                 if (tmpout) BIO_write(tmpout, buf, i);
248         }
249
250         if(flags & PKCS7_TEXT) {
251                 if(!SMIME_text(tmpout, out)) {
252                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
253                         BIO_free(tmpout);
254                         goto err;
255                 }
256                 BIO_free(tmpout);
257         }
258
259         /* Now Verify All Signatures */
260         if (!(flags & PKCS7_NOSIGS))
261             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
262                 {
263                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
264                 signer = sk_X509_value (signers, i);
265                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
266                 if (j <= 0) {
267                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
268                         goto err;
269                 }
270         }
271
272         ret = 1;
273
274         err:
275
276         if(indata) BIO_pop(p7bio);
277         BIO_free_all(p7bio);
278         sk_X509_free(signers);
279
280         return ret;
281 }
282
283 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
284 {
285         STACK_OF(X509) *signers;
286         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
287         PKCS7_SIGNER_INFO *si;
288         PKCS7_ISSUER_AND_SERIAL *ias;
289         X509 *signer;
290         int i;
291
292         if(!p7) {
293                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
294                 return NULL;
295         }
296
297         if(!PKCS7_type_is_signed(p7)) {
298                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
299                 return NULL;
300         }
301         if(!(signers = sk_X509_new_null())) {
302                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
303                 return NULL;
304         }
305
306         /* Collect all the signers together */
307
308         sinfos = PKCS7_get_signer_info(p7);
309
310         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
311                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
312                 return 0;
313         }
314
315         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
316         {
317             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
318             ias = si->issuer_and_serial;
319             signer = NULL;
320                 /* If any certificates passed they take priority */
321             if (certs) signer = X509_find_by_issuer_and_serial (certs,
322                                                 ias->issuer, ias->serial);
323             if (!signer && !(flags & PKCS7_NOINTERN)
324                         && p7->d.sign->cert) signer =
325                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
326                                                 ias->issuer, ias->serial);
327             if (!signer) {
328                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
329                         sk_X509_free(signers);
330                         return 0;
331             }
332
333             sk_X509_push(signers, signer);
334         }
335         return signers;
336 }
337
338
339 /* Build a complete PKCS#7 enveloped data */
340
341 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
342                                                                 int flags)
343 {
344         PKCS7 *p7;
345         BIO *p7bio = NULL;
346         int i;
347         X509 *x509;
348         if(!(p7 = PKCS7_new())) {
349                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
350                 return NULL;
351         }
352
353         PKCS7_set_type(p7, NID_pkcs7_enveloped);
354         if(!PKCS7_set_cipher(p7, cipher)) {
355                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
356                 goto err;
357         }
358
359         for(i = 0; i < sk_X509_num(certs); i++) {
360                 x509 = sk_X509_value(certs, i);
361                 if(!PKCS7_add_recipient(p7, x509)) {
362                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
363                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
364                         goto err;
365                 }
366         }
367
368         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
369                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
370                 goto err;
371         }
372
373         SMIME_crlf_copy(in, p7bio, flags);
374
375         BIO_flush(p7bio);
376
377         if (!PKCS7_dataFinal(p7,p7bio)) {
378                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
379                 goto err;
380         }
381         BIO_free_all(p7bio);
382
383         return p7;
384
385         err:
386
387         BIO_free(p7bio);
388         PKCS7_free(p7);
389         return NULL;
390
391 }
392
393 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
394 {
395         BIO *tmpmem;
396         int ret, i;
397         char buf[4096];
398
399         if(!p7) {
400                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
401                 return 0;
402         }
403
404         if(!PKCS7_type_is_enveloped(p7)) {
405                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
406                 return 0;
407         }
408
409         if(!X509_check_private_key(cert, pkey)) {
410                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
411                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
412                 return 0;
413         }
414
415         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
416                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
417                 return 0;
418         }
419
420         if (flags & PKCS7_TEXT) {
421                 BIO *tmpbuf, *bread;
422                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
423                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
424                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
425                         return 0;
426                 }
427                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
428                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
429                         return 0;
430                 }
431                 ret = SMIME_text(bread, data);
432                 BIO_free_all(bread);
433                 return ret;
434         } else {
435                 for(;;) {
436                         i = BIO_read(tmpmem, buf, sizeof(buf));
437                         if(i <= 0) break;
438                         BIO_write(data, buf, i);
439                 }
440                 BIO_free_all(tmpmem);
441                 return 1;
442         }
443 }