Make the PKCS#7 S/MIME functions check for passed NULL pointers.
[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)
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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(!p7) {
154                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
155                 return NULL;
156         }
157
158         if(!PKCS7_type_is_signed(p7)) {
159                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
160                 return 0;
161         }
162
163         /* Check for no data and no content: no data to verify signature */
164         if(PKCS7_get_detached(p7) && !indata) {
165                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
166                 return 0;
167         }
168
169         /* Check for data and content: two sets of data */
170         if(!PKCS7_get_detached(p7) && indata) {
171                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
172                 return 0;
173         }
174
175         sinfos = PKCS7_get_signer_info(p7);
176
177         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
178                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
179                 return 0;
180         }
181
182
183         signers = PKCS7_iget_signers(p7, certs, flags);
184
185         if(!signers) return 0;
186
187         /* Now verify the certificates */
188
189         if (!(flags & PKCS7_NOVERIFY)) for (i = 0; i < sk_X509_num(signers); i++) {
190                 signer = sk_X509_value (signers, i);
191                 if (!(flags & PKCS7_NOCHAIN)) {
192                         X509_STORE_CTX_init(&cert_ctx, store, signer,
193                                                         p7->d.sign->cert);
194                         X509_STORE_CTX_set_purpose(&cert_ctx,
195                                                 X509_PURPOSE_SMIME_SIGN);
196                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
197                 i = X509_verify_cert(&cert_ctx);
198                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
199                 X509_STORE_CTX_cleanup(&cert_ctx);
200                 if (i <= 0) {
201                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
202                         ERR_add_error_data(2, "Verify error:",
203                                          X509_verify_cert_error_string(j));
204                         sk_X509_free(signers);
205                         return 0;
206                 }
207                 /* Check for revocation status here */
208         }
209
210         p7bio=PKCS7_dataInit(p7,indata);
211
212         if(flags & PKCS7_TEXT) {
213                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
214                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
215                         goto err;
216                 }
217         } else tmpout = out;
218
219         /* We now have to 'read' from p7bio to calculate digests etc. */
220         for (;;)
221         {
222                 i=BIO_read(p7bio,buf,sizeof(buf));
223                 if (i <= 0) break;
224                 if (tmpout) BIO_write(tmpout, buf, i);
225         }
226
227         if(flags & PKCS7_TEXT) {
228                 if(!SMIME_text(tmpout, out)) {
229                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
230                         BIO_free(tmpout);
231                         goto err;
232                 }
233                 BIO_free(tmpout);
234         }
235
236         /* Now Verify All Signatures */
237         if (!(flags & PKCS7_NOSIGS))
238             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
239                 {
240                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
241                 signer = sk_X509_value (signers, i);
242                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
243                 if (j <= 0) {
244                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
245                         goto err;
246                 }
247         }
248
249         sk_X509_free(signers);
250         if(indata) BIO_pop(p7bio);
251         BIO_free_all(p7bio);
252
253         return 1;
254
255         err:
256
257         sk_X509_free(signers);
258         BIO_free(p7bio);
259
260         return 0;
261 }
262
263 STACK_OF(X509) *PKCS7_iget_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
264 {
265         STACK_OF(X509) *signers;
266         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
267         PKCS7_SIGNER_INFO *si;
268         PKCS7_ISSUER_AND_SERIAL *ias;
269         X509 *signer;
270         int i;
271
272         if(!p7) {
273                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
274                 return NULL;
275         }
276
277         if(!PKCS7_type_is_signed(p7)) {
278                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
279                 return NULL;
280         }
281         if(!(signers = sk_X509_new(NULL))) {
282                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,ERR_R_MALLOC_FAILURE);
283                 return NULL;
284         }
285
286         /* Collect all the signers together */
287
288         sinfos = PKCS7_get_signer_info(p7);
289
290         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
291                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_NO_SIGNERS);
292                 return 0;
293         }
294
295         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
296         {
297             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
298             ias = si->issuer_and_serial;
299             signer = NULL;
300                 /* If any certificates passed they take priority */
301             if (certs) signer = X509_find_by_issuer_and_serial (certs,
302                                                 ias->issuer, ias->serial);
303             if (!signer && !(flags & PKCS7_NOINTERN)
304                         && p7->d.sign->cert) signer =
305                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
306                                                 ias->issuer, ias->serial);
307             if (!signer) {
308                         PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
309                         sk_X509_free(signers);
310                         return 0;
311             }
312
313             sk_X509_push(signers, signer);
314         }
315         return signers;
316 }
317
318
319 /* Build a complete PKCS#7 enveloped data */
320
321 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
322                                                                 int flags)
323 {
324         PKCS7 *p7;
325         BIO *p7bio = NULL;
326         int i;
327         X509 *x509;
328         char inbuf[4096];
329         static char txthdr[] = "Content-type: text/plain\r\n\r\n";
330         if(!(p7 = PKCS7_new())) {
331                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
332                 return NULL;
333         }
334
335         PKCS7_set_type(p7, NID_pkcs7_enveloped);
336         if(!PKCS7_set_cipher(p7, cipher)) {
337                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
338                 goto err;
339         }
340
341         for(i = 0; i < sk_X509_num(certs); i++) {
342                 x509 = sk_X509_value(certs, i);
343                 if(!PKCS7_add_recipient(p7, x509)) {
344                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
345                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
346                         goto err;
347                 }
348         }
349
350         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
351                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
352                 goto err;
353         }
354
355         if(flags & PKCS7_TEXT) {
356                 if(BIO_write(p7bio, txthdr, sizeof(txthdr) - 1) < 0) {
357                         goto err;
358                 }
359         }
360
361         for (;;) {
362                 i = BIO_read(in, inbuf, sizeof(inbuf));
363                 if (i <= 0) break;
364                 BIO_write(p7bio, inbuf, i);
365         }
366         BIO_flush(p7bio);
367
368         if (!PKCS7_dataFinal(p7,p7bio)) {
369                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
370                 goto err;
371         }
372         BIO_free_all(p7bio);
373
374         return p7;
375
376         err:
377
378         BIO_free(p7bio);
379         PKCS7_free(p7);
380         return NULL;
381
382 }
383
384 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
385 {
386         BIO *tmpmem;
387         int ret, i;
388         char buf[4096];
389
390         if(!p7) {
391                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
392                 return 0;
393         }
394
395         if(!PKCS7_type_is_enveloped(p7)) {
396                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
397                 return 0;
398         }
399
400         if(!X509_check_private_key(cert, pkey)) {
401                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
402                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
403                 return 0;
404         }
405
406         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
407                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
408                 return 0;
409         }
410
411         if (flags & PKCS7_TEXT) {
412                 BIO *tmpbuf, *bread;
413                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
414                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
415                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
416                         return 0;
417                 }
418                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
419                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
420                         return 0;
421                 }
422                 ret = SMIME_text(bread, data);
423                 BIO_free_all(bread);
424                 return ret;
425         } else {
426                 for(;;) {
427                         i = BIO_read(tmpmem, buf, sizeof(buf));
428                         if(i <= 0) break;
429                         BIO_write(data, buf, i);
430                 }
431                 BIO_free_all(tmpmem);
432                 return 1;
433         }
434 }