3f6cad44f8546760f9185725c1f8284815c90f0e
[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 *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_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                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
119 #endif
120 #ifndef NO_RC2
121                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
122                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
123                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
124 #endif
125                 PKCS7_add_attrib_smimecap (si, smcap);
126                 sk_pop_free(smcap, X509_ALGOR_free);
127         }
128
129         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
130
131         if (!PKCS7_dataFinal(p7,p7bio)) {
132                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
133                 return NULL;
134         }
135
136         BIO_free_all(p7bio);
137         return p7;
138 }
139
140 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
141                                         BIO *indata, BIO *out, int flags)
142 {
143         STACK_OF(X509) *signers;
144         X509 *signer;
145         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
146         PKCS7_SIGNER_INFO *si;
147         X509_STORE_CTX cert_ctx;
148         char buf[4096];
149         int i, j=0;
150         BIO *p7bio;
151         BIO *tmpout;
152
153         if(!PKCS7_type_is_signed(p7)) {
154                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
155                 return 0;
156         }
157
158         /* Check for no data and no content: no data to verify signature */
159         if(PKCS7_get_detached(p7) && !indata) {
160                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
161                 return 0;
162         }
163
164         /* Check for data and content: two sets of data */
165         if(!PKCS7_get_detached(p7) && indata) {
166                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
167                 return 0;
168         }
169
170         sinfos = PKCS7_get_signer_info(p7);
171
172         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
173                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
174                 return 0;
175         }
176
177
178         signers = PKCS7_iget_signers(p7, certs, flags);
179
180         if(!signers) return 0;
181
182         /* Now verify the certificates */
183
184         if (!(flags & PKCS7_NOVERIFY)) for (i = 0; i < sk_X509_num(signers); i++) {
185                 signer = sk_X509_value (signers, i);
186                 if (!(flags & PKCS7_NOCHAIN)) {
187                         X509_STORE_CTX_init(&cert_ctx, store, signer,
188                                                         p7->d.sign->cert);
189                         X509_STORE_CTX_set_purpose(&cert_ctx,
190                                                 X509_PURPOSE_SMIME_SIGN);
191                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
192                 i = X509_verify_cert(&cert_ctx);
193                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
194                 X509_STORE_CTX_cleanup(&cert_ctx);
195                 if (i <= 0) {
196                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
197                         ERR_add_error_data(2, "Verify error:",
198                                          X509_verify_cert_error_string(j));
199                         sk_X509_free(signers);
200                         return 0;
201                 }
202                 /* Check for revocation status here */
203         }
204
205         p7bio=PKCS7_dataInit(p7,indata);
206
207         if(flags & PKCS7_TEXT) {
208                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
209                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
210                         goto err;
211                 }
212         } else tmpout = out;
213
214         /* We now have to 'read' from p7bio to calculate digests etc. */
215         for (;;)
216         {
217                 i=BIO_read(p7bio,buf,sizeof(buf));
218                 if (i <= 0) break;
219                 if (tmpout) BIO_write(tmpout, buf, i);
220         }
221
222         if(flags & PKCS7_TEXT) {
223                 if(!SMIME_text(tmpout, out)) {
224                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
225                         BIO_free(tmpout);
226                         goto err;
227                 }
228                 BIO_free(tmpout);
229         }
230
231         /* Now Verify All Signatures */
232         if (!(flags & PKCS7_NOSIGS))
233             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
234                 {
235                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
236                 signer = sk_X509_value (signers, i);
237                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
238                 if (j <= 0) {
239                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
240                         goto err;
241                 }
242         }
243
244         sk_X509_free(signers);
245         if(indata) BIO_pop(p7bio);
246         BIO_free_all(p7bio);
247
248         return 1;
249
250         err:
251
252         sk_X509_free(signers);
253         BIO_free(p7bio);
254
255         return 0;
256 }
257
258 STACK_OF(X509) *PKCS7_iget_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
259 {
260         STACK_OF(X509) *signers;
261         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
262         PKCS7_SIGNER_INFO *si;
263         PKCS7_ISSUER_AND_SERIAL *ias;
264         X509 *signer;
265         int i;
266
267         if(!PKCS7_type_is_signed(p7)) {
268                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
269                 return NULL;
270         }
271         if(!(signers = sk_X509_new(NULL))) {
272                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,ERR_R_MALLOC_FAILURE);
273                 return NULL;
274         }
275
276         /* Collect all the signers together */
277
278         sinfos = PKCS7_get_signer_info(p7);
279
280         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
281                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_NO_SIGNERS);
282                 return 0;
283         }
284
285         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
286         {
287             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
288             ias = si->issuer_and_serial;
289             signer = NULL;
290                 /* If any certificates passed they take priority */
291             if (certs) signer = X509_find_by_issuer_and_serial (certs,
292                                                 ias->issuer, ias->serial);
293             if (!signer && !(flags & PKCS7_NOINTERN)
294                         && p7->d.sign->cert) signer =
295                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
296                                                 ias->issuer, ias->serial);
297             if (!signer) {
298                         PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
299                         sk_X509_free(signers);
300                         return 0;
301             }
302
303             sk_X509_push(signers, signer);
304         }
305         return signers;
306 }
307
308
309 /* Build a complete PKCS#7 enveloped data */
310
311 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
312                                                                 int flags)
313 {
314         PKCS7 *p7;
315         BIO *p7bio = NULL;
316         int i;
317         X509 *x509;
318         char inbuf[4096];
319         static char txthdr[] = "Content-type: text/plain\r\n\r\n";
320         if(!(p7 = PKCS7_new())) {
321                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
322                 return NULL;
323         }
324
325         PKCS7_set_type(p7, NID_pkcs7_enveloped);
326         if(!PKCS7_set_cipher(p7, cipher)) {
327                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
328                 goto err;
329         }
330
331         for(i = 0; i < sk_X509_num(certs); i++) {
332                 x509 = sk_X509_value(certs, i);
333                 if(!PKCS7_add_recipient(p7, x509)) {
334                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
335                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
336                         goto err;
337                 }
338         }
339
340         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
341                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
342                 goto err;
343         }
344
345         if(flags & PKCS7_TEXT) {
346                 if(BIO_write(p7bio, txthdr, sizeof(txthdr) - 1) < 0) {
347                         goto err;
348                 }
349         }
350
351         for (;;) {
352                 i = BIO_read(in, inbuf, sizeof(inbuf));
353                 if (i <= 0) break;
354                 BIO_write(p7bio, inbuf, i);
355         }
356         BIO_flush(p7bio);
357
358         if (!PKCS7_dataFinal(p7,p7bio)) {
359                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
360                 goto err;
361         }
362         BIO_free_all(p7bio);
363
364         return p7;
365
366         err:
367
368         BIO_free(p7bio);
369         PKCS7_free(p7);
370         return NULL;
371
372 }
373
374 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
375 {
376         BIO *tmpmem;
377         int ret, i;
378         char buf[4096];
379         if(!PKCS7_type_is_enveloped(p7)) {
380                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
381                 return 0;
382         }
383         if(!X509_check_private_key(cert, pkey)) {
384                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
385                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
386                 return 0;
387         }
388
389         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
390                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
391                 return 0;
392         }
393
394         if (flags & PKCS7_TEXT) {
395                 BIO *tmpbuf, *bread;
396                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
397                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
398                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
399                         return 0;
400                 }
401                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
402                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
403                         return 0;
404                 }
405                 ret = SMIME_text(bread, data);
406                 BIO_free_all(bread);
407                 return ret;
408         } else {
409                 for(;;) {
410                         i = BIO_read(tmpmem, buf, sizeof(buf));
411                         if(i <= 0) break;
412                         BIO_write(data, buf, i);
413                 }
414                 BIO_free_all(tmpmem);
415                 return 1;
416         }
417 }