Various fixes...
[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 1999.
4  */
5 /* ====================================================================
6  * Copyright (c) 1999 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(!(p7bio = PKCS7_dataInit(p7, NULL))) {
101                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
102                 return NULL;
103         }
104
105
106         SMIME_crlf_copy(data, p7bio, flags);
107
108         if(!(flags & PKCS7_NOATTR)) {
109                 PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
110                                 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data));
111                 /* Add SMIMECapabilities */
112                 if(!(smcap = sk_X509_ALGOR_new(NULL))) {
113                         PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
114                         return NULL;
115                 }
116 #ifndef NO_DES
117                 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1);
118 #endif
119 #ifndef NO_RC2
120                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
121                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
122 #endif
123 #ifndef NO_DES
124                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
125 #endif
126 #ifndef NO_RC2
127                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
128 #endif
129                 PKCS7_add_attrib_smimecap (si, smcap);
130                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
131         }
132
133         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
134
135         if (!PKCS7_dataFinal(p7,p7bio)) {
136                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
137                 return NULL;
138         }
139
140         BIO_free_all(p7bio);
141         return p7;
142 }
143
144 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
145                                         BIO *indata, BIO *out, int flags)
146 {
147         STACK_OF(X509) *signers;
148         X509 *signer;
149         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
150         PKCS7_SIGNER_INFO *si;
151         X509_STORE_CTX cert_ctx;
152         char buf[4096];
153         int i, j=0;
154         BIO *p7bio;
155         BIO *tmpout;
156
157         if(!p7) {
158                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
159                 return 0;
160         }
161
162         if(!PKCS7_type_is_signed(p7)) {
163                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
164                 return 0;
165         }
166
167         /* Check for no data and no content: no data to verify signature */
168         if(PKCS7_get_detached(p7) && !indata) {
169                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
170                 return 0;
171         }
172
173         /* Check for data and content: two sets of data */
174         if(!PKCS7_get_detached(p7) && indata) {
175                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
176                 return 0;
177         }
178
179         sinfos = PKCS7_get_signer_info(p7);
180
181         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
182                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
183                 return 0;
184         }
185
186
187         signers = PKCS7_get0_signers(p7, certs, flags);
188
189         if(!signers) return 0;
190
191         /* Now verify the certificates */
192
193         if (!(flags & PKCS7_NOVERIFY)) for (i = 0; i < sk_X509_num(signers); i++) {
194                 signer = sk_X509_value (signers, i);
195                 if (!(flags & PKCS7_NOCHAIN)) {
196                         X509_STORE_CTX_init(&cert_ctx, store, signer,
197                                                         p7->d.sign->cert);
198                         X509_STORE_CTX_set_purpose(&cert_ctx,
199                                                 X509_PURPOSE_SMIME_SIGN);
200                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
201                 i = X509_verify_cert(&cert_ctx);
202                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
203                 X509_STORE_CTX_cleanup(&cert_ctx);
204                 if (i <= 0) {
205                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
206                         ERR_add_error_data(2, "Verify error:",
207                                          X509_verify_cert_error_string(j));
208                         sk_X509_free(signers);
209                         return 0;
210                 }
211                 /* Check for revocation status here */
212         }
213
214         p7bio=PKCS7_dataInit(p7,indata);
215
216         if(flags & PKCS7_TEXT) {
217                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
218                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
219                         goto err;
220                 }
221         } else tmpout = out;
222
223         /* We now have to 'read' from p7bio to calculate digests etc. */
224         for (;;)
225         {
226                 i=BIO_read(p7bio,buf,sizeof(buf));
227                 if (i <= 0) break;
228                 if (tmpout) BIO_write(tmpout, buf, i);
229         }
230
231         if(flags & PKCS7_TEXT) {
232                 if(!SMIME_text(tmpout, out)) {
233                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
234                         BIO_free(tmpout);
235                         goto err;
236                 }
237                 BIO_free(tmpout);
238         }
239
240         /* Now Verify All Signatures */
241         if (!(flags & PKCS7_NOSIGS))
242             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
243                 {
244                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
245                 signer = sk_X509_value (signers, i);
246                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
247                 if (j <= 0) {
248                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
249                         goto err;
250                 }
251         }
252
253         sk_X509_free(signers);
254         if(indata) BIO_pop(p7bio);
255         BIO_free_all(p7bio);
256
257         return 1;
258
259         err:
260
261         sk_X509_free(signers);
262         BIO_free(p7bio);
263
264         return 0;
265 }
266
267 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
268 {
269         STACK_OF(X509) *signers;
270         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
271         PKCS7_SIGNER_INFO *si;
272         PKCS7_ISSUER_AND_SERIAL *ias;
273         X509 *signer;
274         int i;
275
276         if(!p7) {
277                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
278                 return NULL;
279         }
280
281         if(!PKCS7_type_is_signed(p7)) {
282                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
283                 return NULL;
284         }
285         if(!(signers = sk_X509_new(NULL))) {
286                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
287                 return NULL;
288         }
289
290         /* Collect all the signers together */
291
292         sinfos = PKCS7_get_signer_info(p7);
293
294         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
295                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
296                 return 0;
297         }
298
299         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
300         {
301             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
302             ias = si->issuer_and_serial;
303             signer = NULL;
304                 /* If any certificates passed they take priority */
305             if (certs) signer = X509_find_by_issuer_and_serial (certs,
306                                                 ias->issuer, ias->serial);
307             if (!signer && !(flags & PKCS7_NOINTERN)
308                         && p7->d.sign->cert) signer =
309                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
310                                                 ias->issuer, ias->serial);
311             if (!signer) {
312                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
313                         sk_X509_free(signers);
314                         return 0;
315             }
316
317             sk_X509_push(signers, signer);
318         }
319         return signers;
320 }
321
322
323 /* Build a complete PKCS#7 enveloped data */
324
325 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
326                                                                 int flags)
327 {
328         PKCS7 *p7;
329         BIO *p7bio = NULL;
330         int i;
331         X509 *x509;
332         if(!(p7 = PKCS7_new())) {
333                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
334                 return NULL;
335         }
336
337         PKCS7_set_type(p7, NID_pkcs7_enveloped);
338         if(!PKCS7_set_cipher(p7, cipher)) {
339                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
340                 goto err;
341         }
342
343         for(i = 0; i < sk_X509_num(certs); i++) {
344                 x509 = sk_X509_value(certs, i);
345                 if(!PKCS7_add_recipient(p7, x509)) {
346                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
347                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
348                         goto err;
349                 }
350         }
351
352         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
353                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
354                 goto err;
355         }
356
357         SMIME_crlf_copy(in, p7bio, flags);
358
359         BIO_flush(p7bio);
360
361         if (!PKCS7_dataFinal(p7,p7bio)) {
362                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
363                 goto err;
364         }
365         BIO_free_all(p7bio);
366
367         return p7;
368
369         err:
370
371         BIO_free(p7bio);
372         PKCS7_free(p7);
373         return NULL;
374
375 }
376
377 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
378 {
379         BIO *tmpmem;
380         int ret, i;
381         char buf[4096];
382
383         if(!p7) {
384                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
385                 return 0;
386         }
387
388         if(!PKCS7_type_is_enveloped(p7)) {
389                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
390                 return 0;
391         }
392
393         if(!X509_check_private_key(cert, pkey)) {
394                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
395                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
396                 return 0;
397         }
398
399         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
400                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
401                 return 0;
402         }
403
404         if (flags & PKCS7_TEXT) {
405                 BIO *tmpbuf, *bread;
406                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
407                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
408                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
409                         return 0;
410                 }
411                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
412                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
413                         return 0;
414                 }
415                 ret = SMIME_text(bread, data);
416                 BIO_free_all(bread);
417                 return ret;
418         } else {
419                 for(;;) {
420                         i = BIO_read(tmpmem, buf, sizeof(buf));
421                         if(i <= 0) break;
422                         BIO_write(data, buf, i);
423                 }
424                 BIO_free_all(tmpmem);
425                 return 1;
426         }
427 }