Fix possible memory leak.
[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) 1999-2004 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 /* 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_STREAM)
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 *tmpin, *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                 if (!(flags & PKCS7_NOCRL))
221                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
222                 i = X509_verify_cert(&cert_ctx);
223                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
224                 X509_STORE_CTX_cleanup(&cert_ctx);
225                 if (i <= 0) {
226                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
227                         ERR_add_error_data(2, "Verify error:",
228                                          X509_verify_cert_error_string(j));
229                         sk_X509_free(signers);
230                         return 0;
231                 }
232                 /* Check for revocation status here */
233         }
234
235         /* Performance optimization: if the content is a memory BIO then
236          * store its contents in a temporary read only memory BIO. This
237          * avoids potentially large numbers of slow copies of data which will
238          * occur when reading from a read write memory BIO when signatures
239          * are calculated.
240          */
241
242         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
243                 {
244                 char *ptr;
245                 long len;
246                 len = BIO_get_mem_data(indata, &ptr);
247                 tmpin = BIO_new_mem_buf(ptr, len);
248                 if (tmpin == NULL)
249                         {
250                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
251                         return 0;
252                         }
253                 }
254         else
255                 tmpin = indata;
256                 
257
258         p7bio=PKCS7_dataInit(p7,tmpin);
259
260         if(flags & PKCS7_TEXT) {
261                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
262                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
263                         goto err;
264                 }
265         } else tmpout = out;
266
267         /* We now have to 'read' from p7bio to calculate digests etc. */
268         for (;;)
269         {
270                 i=BIO_read(p7bio,buf,sizeof(buf));
271                 if (i <= 0) break;
272                 if (tmpout) BIO_write(tmpout, buf, i);
273         }
274
275         if(flags & PKCS7_TEXT) {
276                 if(!SMIME_text(tmpout, out)) {
277                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
278                         BIO_free(tmpout);
279                         goto err;
280                 }
281                 BIO_free(tmpout);
282         }
283
284         /* Now Verify All Signatures */
285         if (!(flags & PKCS7_NOSIGS))
286             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
287                 {
288                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
289                 signer = sk_X509_value (signers, i);
290                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
291                 if (j <= 0) {
292                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
293                         goto err;
294                 }
295         }
296
297         ret = 1;
298
299         err:
300         
301         if (tmpin == indata)
302                 {
303                 if(indata) BIO_pop(p7bio);
304                 BIO_free_all(p7bio);
305                 }
306         else
307                 BIO_free_all(tmpin);
308
309         sk_X509_free(signers);
310
311         return ret;
312 }
313
314 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
315 {
316         STACK_OF(X509) *signers;
317         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
318         PKCS7_SIGNER_INFO *si;
319         PKCS7_ISSUER_AND_SERIAL *ias;
320         X509 *signer;
321         int i;
322
323         if(!p7) {
324                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
325                 return NULL;
326         }
327
328         if(!PKCS7_type_is_signed(p7)) {
329                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
330                 return NULL;
331         }
332
333         /* Collect all the signers together */
334
335         sinfos = PKCS7_get_signer_info(p7);
336
337         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
338                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
339                 return 0;
340         }
341
342         if(!(signers = sk_X509_new_null())) {
343                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
344                 return NULL;
345         }
346
347         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
348         {
349             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
350             ias = si->issuer_and_serial;
351             signer = NULL;
352                 /* If any certificates passed they take priority */
353             if (certs) signer = X509_find_by_issuer_and_serial (certs,
354                                                 ias->issuer, ias->serial);
355             if (!signer && !(flags & PKCS7_NOINTERN)
356                         && p7->d.sign->cert) signer =
357                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
358                                                 ias->issuer, ias->serial);
359             if (!signer) {
360                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
361                         sk_X509_free(signers);
362                         return 0;
363             }
364
365             sk_X509_push(signers, signer);
366         }
367         return signers;
368 }
369
370
371 /* Build a complete PKCS#7 enveloped data */
372
373 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
374                                                                 int flags)
375 {
376         PKCS7 *p7;
377         BIO *p7bio = NULL;
378         int i;
379         X509 *x509;
380         if(!(p7 = PKCS7_new())) {
381                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
382                 return NULL;
383         }
384
385         PKCS7_set_type(p7, NID_pkcs7_enveloped);
386         if(!PKCS7_set_cipher(p7, cipher)) {
387                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
388                 goto err;
389         }
390
391         for(i = 0; i < sk_X509_num(certs); i++) {
392                 x509 = sk_X509_value(certs, i);
393                 if(!PKCS7_add_recipient(p7, x509)) {
394                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
395                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
396                         goto err;
397                 }
398         }
399
400         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
401                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
402                 goto err;
403         }
404
405         SMIME_crlf_copy(in, p7bio, flags);
406
407         BIO_flush(p7bio);
408
409         if (!PKCS7_dataFinal(p7,p7bio)) {
410                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
411                 goto err;
412         }
413         BIO_free_all(p7bio);
414
415         return p7;
416
417         err:
418
419         BIO_free(p7bio);
420         PKCS7_free(p7);
421         return NULL;
422
423 }
424
425 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
426 {
427         BIO *tmpmem;
428         int ret, i;
429         char buf[4096];
430
431         if(!p7) {
432                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
433                 return 0;
434         }
435
436         if(!PKCS7_type_is_enveloped(p7)) {
437                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
438                 return 0;
439         }
440
441         if(!X509_check_private_key(cert, pkey)) {
442                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
443                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
444                 return 0;
445         }
446
447         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
448                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
449                 return 0;
450         }
451
452         if (flags & PKCS7_TEXT) {
453                 BIO *tmpbuf, *bread;
454                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
455                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
456                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
457                         return 0;
458                 }
459                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
460                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
461                         return 0;
462                 }
463                 ret = SMIME_text(bread, data);
464                 BIO_free_all(bread);
465                 return ret;
466         } else {
467                 for(;;) {
468                         i = BIO_read(tmpmem, buf, sizeof(buf));
469                         if(i <= 0) break;
470                         BIO_write(data, buf, i);
471                 }
472                 BIO_free_all(tmpmem);
473                 return 1;
474         }
475 }