]> git.ipfire.org Git - thirdparty/openssl.git/blame - crypto/pkcs7/pk7_doit.c
Fix safestack issues in pkcs7.h
[thirdparty/openssl.git] / crypto / pkcs7 / pk7_doit.c
CommitLineData
62867571 1/*
454afd98 2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
d02b48c6 3 *
b7617a3a 4 * Licensed under the Apache License 2.0 (the "License"). You may not use
62867571
RS
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
d02b48c6
RE
8 */
9
10#include <stdio.h>
b39fc560 11#include "internal/cryptlib.h"
ec577822
BM
12#include <openssl/rand.h>
13#include <openssl/objects.h>
14#include <openssl/x509.h>
5a9a4b29 15#include <openssl/x509v3.h>
8f2e4fdf 16#include <openssl/err.h>
90a1f2d7 17#include "pk7_local.h"
d02b48c6 18
b6436ff2 19static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
0f113f3e 20 void *value);
b6436ff2 21static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
dfeab068 22
0f113f3e
MC
23static int PKCS7_type_is_other(PKCS7 *p7)
24{
25 int isOther = 1;
26
27 int nid = OBJ_obj2nid(p7->type);
28
29 switch (nid) {
30 case NID_pkcs7_data:
31 case NID_pkcs7_signed:
32 case NID_pkcs7_enveloped:
33 case NID_pkcs7_signedAndEnveloped:
34 case NID_pkcs7_digest:
35 case NID_pkcs7_encrypted:
36 isOther = 0;
37 break;
38 default:
39 isOther = 1;
40 }
41
42 return isOther;
43
44}
67fec850 45
caf044cb 46static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
0f113f3e
MC
47{
48 if (PKCS7_type_is_data(p7))
49 return p7->d.data;
50 if (PKCS7_type_is_other(p7) && p7->d.other
51 && (p7->d.other->type == V_ASN1_OCTET_STRING))
52 return p7->d.other->value.octet_string;
53 return NULL;
54}
67fec850 55
90a1f2d7
SL
56static int pkcs7_bio_add_digest(BIO **pbio, X509_ALGOR *alg,
57 const PKCS7_CTX *ctx)
0f113f3e
MC
58{
59 BIO *btmp;
90a1f2d7
SL
60 const char *name;
61 EVP_MD *fetched = NULL;
bd1bbbfe 62 const EVP_MD *md;
90a1f2d7 63
0f113f3e
MC
64 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
65 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
66 goto err;
67 }
68
90a1f2d7 69 name = OBJ_nid2sn(OBJ_obj2nid(alg->algorithm));
bd1bbbfe
DB
70
71 (void)ERR_set_mark();
90a1f2d7 72 fetched = EVP_MD_fetch(ctx->libctx, name, ctx->propq);
bd1bbbfe
DB
73 if (fetched != NULL)
74 md = fetched;
75 else
76 md = EVP_get_digestbyname(name);
77
78 if (md == NULL) {
79 (void)ERR_clear_last_mark();
0f113f3e
MC
80 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
81 goto err;
82 }
bd1bbbfe 83 (void)ERR_pop_to_mark();
0f113f3e 84
bd1bbbfe 85 BIO_set_md(btmp, md);
90a1f2d7 86 EVP_MD_free(fetched);
0f113f3e
MC
87 if (*pbio == NULL)
88 *pbio = btmp;
89 else if (!BIO_push(*pbio, btmp)) {
90 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
91 goto err;
92 }
93 btmp = NULL;
94
95 return 1;
96
97 err:
ca3a82c3 98 BIO_free(btmp);
0f113f3e 99 return 0;
0f113f3e 100}
399a6f0b 101
0f113f3e
MC
102static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
103 unsigned char *key, int keylen)
104{
105 EVP_PKEY_CTX *pctx = NULL;
106 EVP_PKEY *pkey = NULL;
107 unsigned char *ek = NULL;
108 int ret = 0;
109 size_t eklen;
90a1f2d7 110 const PKCS7_CTX *ctx = ri->ctx;
399a6f0b 111
8382fd3a 112 pkey = X509_get0_pubkey(ri->cert);
12a765a5 113 if (pkey == NULL)
0f113f3e 114 return 0;
399a6f0b 115
90a1f2d7 116 pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, pkey, ctx->propq);
12a765a5 117 if (pctx == NULL)
0f113f3e 118 return 0;
399a6f0b 119
0f113f3e
MC
120 if (EVP_PKEY_encrypt_init(pctx) <= 0)
121 goto err;
399a6f0b 122
0f113f3e
MC
123 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
124 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
125 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
126 goto err;
127 }
399a6f0b 128
0f113f3e
MC
129 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
130 goto err;
399a6f0b 131
0f113f3e 132 ek = OPENSSL_malloc(eklen);
399a6f0b 133
0f113f3e
MC
134 if (ek == NULL) {
135 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
136 goto err;
137 }
399a6f0b 138
0f113f3e
MC
139 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
140 goto err;
399a6f0b 141
0f113f3e
MC
142 ASN1_STRING_set0(ri->enc_key, ek, eklen);
143 ek = NULL;
399a6f0b 144
0f113f3e 145 ret = 1;
399a6f0b 146
0f113f3e 147 err:
c5ba2d99 148 EVP_PKEY_CTX_free(pctx);
b548a1f1 149 OPENSSL_free(ek);
0f113f3e 150 return ret;
399a6f0b 151
0f113f3e 152}
399a6f0b 153
777c47ac 154static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
5840ed0c
BE
155 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
156 size_t fixlen)
0f113f3e
MC
157{
158 EVP_PKEY_CTX *pctx = NULL;
159 unsigned char *ek = NULL;
160 size_t eklen;
0f113f3e 161 int ret = -1;
90a1f2d7 162 const PKCS7_CTX *ctx = ri->ctx;
0f113f3e 163
90a1f2d7 164 pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, pkey, ctx->propq);
12a765a5 165 if (pctx == NULL)
0f113f3e
MC
166 return -1;
167
168 if (EVP_PKEY_decrypt_init(pctx) <= 0)
169 goto err;
170
171 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
172 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
173 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
174 goto err;
175 }
176
177 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
178 ri->enc_key->data, ri->enc_key->length) <= 0)
179 goto err;
180
181 ek = OPENSSL_malloc(eklen);
182
183 if (ek == NULL) {
184 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
185 goto err;
186 }
187
188 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
5840ed0c
BE
189 ri->enc_key->data, ri->enc_key->length) <= 0
190 || eklen == 0
191 || (fixlen != 0 && eklen != fixlen)) {
0f113f3e
MC
192 ret = 0;
193 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
194 goto err;
195 }
196
197 ret = 1;
198
4b45c6e5 199 OPENSSL_clear_free(*pek, *peklen);
0f113f3e
MC
200 *pek = ek;
201 *peklen = eklen;
202
203 err:
c5ba2d99 204 EVP_PKEY_CTX_free(pctx);
b548a1f1 205 if (!ret)
0f113f3e
MC
206 OPENSSL_free(ek);
207
208 return ret;
209}
399a6f0b 210
6b691a5c 211BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
0f113f3e
MC
212{
213 int i;
214 BIO *out = NULL, *btmp = NULL;
215 X509_ALGOR *xa = NULL;
90a1f2d7 216 EVP_CIPHER *fetched_cipher = NULL;
835b2900 217 const EVP_CIPHER *cipher;
0f113f3e
MC
218 const EVP_CIPHER *evp_cipher = NULL;
219 STACK_OF(X509_ALGOR) *md_sk = NULL;
220 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
221 X509_ALGOR *xalg = NULL;
222 PKCS7_RECIP_INFO *ri = NULL;
223 ASN1_OCTET_STRING *os = NULL;
90a1f2d7 224 const PKCS7_CTX *p7_ctx;
0f113f3e 225
c225c3cf
EK
226 if (p7 == NULL) {
227 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
228 return NULL;
229 }
90a1f2d7
SL
230 p7_ctx = pkcs7_get0_ctx(p7);
231
c225c3cf
EK
232 /*
233 * The content field in the PKCS7 ContentInfo is optional, but that really
234 * only applies to inner content (precisely, detached signatures).
235 *
236 * When reading content, missing outer content is therefore treated as an
237 * error.
238 *
239 * When creating content, PKCS7_content_new() must be called before
240 * calling this method, so a NULL p7->d is always an error.
241 */
242 if (p7->d.ptr == NULL) {
243 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
244 return NULL;
245 }
246
0f113f3e
MC
247 i = OBJ_obj2nid(p7->type);
248 p7->state = PKCS7_S_HEADER;
249
250 switch (i) {
251 case NID_pkcs7_signed:
252 md_sk = p7->d.sign->md_algs;
253 os = PKCS7_get_octet_string(p7->d.sign->contents);
254 break;
255 case NID_pkcs7_signedAndEnveloped:
256 rsk = p7->d.signed_and_enveloped->recipientinfo;
257 md_sk = p7->d.signed_and_enveloped->md_algs;
258 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
259 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
260 if (evp_cipher == NULL) {
261 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
262 goto err;
263 }
264 break;
265 case NID_pkcs7_enveloped:
266 rsk = p7->d.enveloped->recipientinfo;
267 xalg = p7->d.enveloped->enc_data->algorithm;
268 evp_cipher = p7->d.enveloped->enc_data->cipher;
269 if (evp_cipher == NULL) {
270 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
271 goto err;
272 }
273 break;
274 case NID_pkcs7_digest:
275 xa = p7->d.digest->md;
276 os = PKCS7_get_octet_string(p7->d.digest->contents);
277 break;
278 case NID_pkcs7_data:
279 break;
280 default:
281 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
282 goto err;
283 }
284
285 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
90a1f2d7 286 if (!pkcs7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i), p7_ctx))
0f113f3e
MC
287 goto err;
288
90a1f2d7 289 if (xa && !pkcs7_bio_add_digest(&out, xa, p7_ctx))
0f113f3e
MC
290 goto err;
291
292 if (evp_cipher != NULL) {
293 unsigned char key[EVP_MAX_KEY_LENGTH];
294 unsigned char iv[EVP_MAX_IV_LENGTH];
295 int keylen, ivlen;
296 EVP_CIPHER_CTX *ctx;
297
298 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
299 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
300 goto err;
301 }
302 BIO_get_cipher_ctx(btmp, &ctx);
303 keylen = EVP_CIPHER_key_length(evp_cipher);
304 ivlen = EVP_CIPHER_iv_length(evp_cipher);
305 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
306 if (ivlen > 0)
90a1f2d7 307 if (RAND_bytes_ex(p7_ctx->libctx, iv, ivlen) <= 0)
0f113f3e 308 goto err;
90a1f2d7 309
835b2900 310 (void)ERR_set_mark();
90a1f2d7
SL
311 fetched_cipher = EVP_CIPHER_fetch(p7_ctx->libctx,
312 EVP_CIPHER_name(evp_cipher),
313 p7_ctx->propq);
0f0b7dfb 314 (void)ERR_pop_to_mark();
835b2900
DB
315 if (fetched_cipher != NULL)
316 cipher = fetched_cipher;
317 else
318 cipher = evp_cipher;
319
835b2900 320 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, 1) <= 0)
90a1f2d7
SL
321 goto err;
322
323 EVP_CIPHER_free(fetched_cipher);
324 fetched_cipher = NULL;
325
0f113f3e
MC
326 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
327 goto err;
328 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
329 goto err;
330
331 if (ivlen > 0) {
332 if (xalg->parameter == NULL) {
333 xalg->parameter = ASN1_TYPE_new();
334 if (xalg->parameter == NULL)
335 goto err;
336 }
337 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
338 goto err;
339 }
340
341 /* Lets do the pub key stuff :-) */
342 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
343 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
344 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
345 goto err;
346 }
347 OPENSSL_cleanse(key, keylen);
348
349 if (out == NULL)
350 out = btmp;
351 else
352 BIO_push(out, btmp);
353 btmp = NULL;
354 }
355
356 if (bio == NULL) {
4718f449 357 if (PKCS7_is_detached(p7)) {
0f113f3e 358 bio = BIO_new(BIO_s_null());
4718f449 359 } else if (os && os->length > 0) {
0f113f3e 360 bio = BIO_new_mem_buf(os->data, os->length);
4718f449 361 } else {
0f113f3e
MC
362 bio = BIO_new(BIO_s_mem());
363 if (bio == NULL)
364 goto err;
365 BIO_set_mem_eof_return(bio, 0);
366 }
4718f449
MC
367 if (bio == NULL)
368 goto err;
0f113f3e
MC
369 }
370 if (out)
371 BIO_push(out, bio);
372 else
373 out = bio;
ca3a82c3
RS
374 return out;
375
0f113f3e 376 err:
90a1f2d7 377 EVP_CIPHER_free(fetched_cipher);
ca3a82c3
RS
378 BIO_free_all(out);
379 BIO_free_all(btmp);
380 return NULL;
0f113f3e 381}
dfeab068 382
8f2e4fdf 383static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
0f113f3e
MC
384{
385 int ret;
386 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
a8d8e06b 387 X509_get_issuer_name(pcert));
0f113f3e
MC
388 if (ret)
389 return ret;
1337a3a9 390 return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
a8d8e06b 391 ri->issuer_and_serial->serial);
0f113f3e 392}
8f2e4fdf 393
dfeab068 394/* int */
84fa704c 395BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
0f113f3e 396{
90a1f2d7 397 int i, len;
0f113f3e
MC
398 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
399 X509_ALGOR *xa;
400 ASN1_OCTET_STRING *data_body = NULL;
90a1f2d7 401 EVP_MD *evp_md = NULL;
bd1bbbfe 402 const EVP_MD *md;
90a1f2d7 403 EVP_CIPHER *evp_cipher = NULL;
835b2900 404 const EVP_CIPHER *cipher = NULL;
0f113f3e
MC
405 EVP_CIPHER_CTX *evp_ctx = NULL;
406 X509_ALGOR *enc_alg = NULL;
407 STACK_OF(X509_ALGOR) *md_sk = NULL;
408 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
409 PKCS7_RECIP_INFO *ri = NULL;
410 unsigned char *ek = NULL, *tkey = NULL;
411 int eklen = 0, tkeylen = 0;
90a1f2d7
SL
412 const char *name;
413 const PKCS7_CTX *p7_ctx;
0f113f3e 414
c225c3cf
EK
415 if (p7 == NULL) {
416 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
417 return NULL;
418 }
419
90a1f2d7
SL
420 p7_ctx = pkcs7_get0_ctx(p7);
421
c225c3cf
EK
422 if (p7->d.ptr == NULL) {
423 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
424 return NULL;
425 }
426
0f113f3e
MC
427 i = OBJ_obj2nid(p7->type);
428 p7->state = PKCS7_S_HEADER;
429
430 switch (i) {
431 case NID_pkcs7_signed:
59302b60
EK
432 /*
433 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
434 * field and optional content.
435 * data_body is NULL if that structure has no (=detached) content
436 * or if the contentType is wrong (i.e., not "data").
437 */
0f113f3e
MC
438 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
439 if (!PKCS7_is_detached(p7) && data_body == NULL) {
440 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
441 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
442 goto err;
443 }
444 md_sk = p7->d.sign->md_algs;
445 break;
446 case NID_pkcs7_signedAndEnveloped:
447 rsk = p7->d.signed_and_enveloped->recipientinfo;
448 md_sk = p7->d.signed_and_enveloped->md_algs;
59302b60 449 /* data_body is NULL if the optional EncryptedContent is missing. */
0f113f3e
MC
450 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
451 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
90a1f2d7
SL
452
453 name = OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm));
835b2900
DB
454
455 (void)ERR_set_mark();
90a1f2d7 456 evp_cipher = EVP_CIPHER_fetch(p7_ctx->libctx, name, p7_ctx->propq);
835b2900
DB
457 if (evp_cipher != NULL)
458 cipher = evp_cipher;
459 else
460 cipher = EVP_get_cipherbyname(name);
461
462 if (cipher == NULL) {
463 (void)ERR_clear_last_mark();
0f113f3e
MC
464 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
465 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
466 goto err;
467 }
835b2900 468 (void)ERR_pop_to_mark();
0f113f3e
MC
469 break;
470 case NID_pkcs7_enveloped:
471 rsk = p7->d.enveloped->recipientinfo;
472 enc_alg = p7->d.enveloped->enc_data->algorithm;
59302b60 473 /* data_body is NULL if the optional EncryptedContent is missing. */
0f113f3e 474 data_body = p7->d.enveloped->enc_data->enc_data;
90a1f2d7 475 name = OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm));
835b2900
DB
476
477 (void)ERR_set_mark();
90a1f2d7 478 evp_cipher = EVP_CIPHER_fetch(p7_ctx->libctx, name, p7_ctx->propq);
835b2900
DB
479 if (evp_cipher != NULL)
480 cipher = evp_cipher;
481 else
482 cipher = EVP_get_cipherbyname(name);
483
484 if (cipher == NULL) {
485 (void)ERR_clear_last_mark();
0f113f3e
MC
486 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
487 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
488 goto err;
489 }
835b2900 490 (void)ERR_pop_to_mark();
0f113f3e
MC
491 break;
492 default:
493 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
494 goto err;
495 }
496
59302b60
EK
497 /* Detached content must be supplied via in_bio instead. */
498 if (data_body == NULL && in_bio == NULL) {
499 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
500 goto err;
501 }
502
0f113f3e
MC
503 /* We will be checking the signature */
504 if (md_sk != NULL) {
505 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
506 xa = sk_X509_ALGOR_value(md_sk, i);
507 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
508 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
509 goto err;
510 }
511
90a1f2d7 512 name = OBJ_nid2sn(OBJ_obj2nid(xa->algorithm));
bd1bbbfe
DB
513
514 (void)ERR_set_mark();
90a1f2d7 515 evp_md = EVP_MD_fetch(p7_ctx->libctx, name, p7_ctx->propq);
bd1bbbfe
DB
516 if (evp_md != NULL)
517 md = evp_md;
518 else
519 md = EVP_get_digestbyname(name);
520
521 if (md == NULL) {
522 (void)ERR_clear_last_mark();
0f113f3e
MC
523 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
524 PKCS7_R_UNKNOWN_DIGEST_TYPE);
525 goto err;
526 }
bd1bbbfe 527 (void)ERR_pop_to_mark();
0f113f3e 528
bd1bbbfe 529 BIO_set_md(btmp, md);
90a1f2d7 530 EVP_MD_free(evp_md);
0f113f3e
MC
531 if (out == NULL)
532 out = btmp;
533 else
534 BIO_push(out, btmp);
535 btmp = NULL;
536 }
537 }
538
835b2900 539 if (cipher != NULL) {
0f113f3e
MC
540 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
541 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
542 goto err;
543 }
544
545 /*
546 * It was encrypted, we need to decrypt the secret key with the
547 * private key
548 */
549
550 /*
551 * Find the recipientInfo which matches the passed certificate (if
552 * any)
553 */
554
555 if (pcert) {
556 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
557 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
558 if (!pkcs7_cmp_ri(ri, pcert))
559 break;
560 ri = NULL;
561 }
562 if (ri == NULL) {
563 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
564 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
565 goto err;
566 }
567 }
568
569 /* If we haven't got a certificate try each ri in turn */
570 if (pcert == NULL) {
571 /*
572 * Always attempt to decrypt all rinfo even after success as a
573 * defence against MMA timing attacks.
574 */
575 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
576 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
90a1f2d7 577 ri->ctx = p7_ctx;
5840ed0c 578 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
835b2900 579 EVP_CIPHER_key_length(cipher)) < 0)
0f113f3e
MC
580 goto err;
581 ERR_clear_error();
582 }
583 } else {
90a1f2d7 584 ri->ctx = p7_ctx;
0f113f3e 585 /* Only exit on fatal errors, not decrypt failure */
5840ed0c 586 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
0f113f3e
MC
587 goto err;
588 ERR_clear_error();
589 }
590
591 evp_ctx = NULL;
592 BIO_get_cipher_ctx(etmp, &evp_ctx);
835b2900 593 if (EVP_CipherInit_ex(evp_ctx, cipher, NULL, NULL, NULL, 0) <= 0)
0f113f3e
MC
594 goto err;
595 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
596 goto err;
597 /* Generate random key as MMA defence */
eae4a008
SL
598 len = EVP_CIPHER_CTX_key_length(evp_ctx);
599 if (len <= 0)
600 goto err;
601 tkeylen = (size_t)len;
0f113f3e 602 tkey = OPENSSL_malloc(tkeylen);
90945fa3 603 if (tkey == NULL)
0f113f3e
MC
604 goto err;
605 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
606 goto err;
607 if (ek == NULL) {
608 ek = tkey;
609 eklen = tkeylen;
610 tkey = NULL;
611 }
612
613 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
614 /*
615 * Some S/MIME clients don't use the same key and effective key
616 * length. The key length is determined by the size of the
617 * decrypted RSA key.
618 */
619 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
620 /* Use random key as MMA defence */
4b45c6e5 621 OPENSSL_clear_free(ek, eklen);
0f113f3e
MC
622 ek = tkey;
623 eklen = tkeylen;
624 tkey = NULL;
625 }
626 }
627 /* Clear errors so we don't leak information useful in MMA */
628 ERR_clear_error();
629 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
630 goto err;
631
4b45c6e5
RS
632 OPENSSL_clear_free(ek, eklen);
633 ek = NULL;
634 OPENSSL_clear_free(tkey, tkeylen);
635 tkey = NULL;
0f113f3e
MC
636
637 if (out == NULL)
638 out = etmp;
639 else
640 BIO_push(out, etmp);
641 etmp = NULL;
642 }
59302b60 643 if (in_bio != NULL) {
0f113f3e
MC
644 bio = in_bio;
645 } else {
0f113f3e
MC
646 if (data_body->length > 0)
647 bio = BIO_new_mem_buf(data_body->data, data_body->length);
648 else {
649 bio = BIO_new(BIO_s_mem());
90945fa3
MC
650 if (bio == NULL)
651 goto err;
0f113f3e
MC
652 BIO_set_mem_eof_return(bio, 0);
653 }
654 if (bio == NULL)
655 goto err;
0f113f3e
MC
656 }
657 BIO_push(out, bio);
658 bio = NULL;
90a1f2d7 659 EVP_CIPHER_free(evp_cipher);
4b45c6e5
RS
660 return out;
661
0f113f3e 662 err:
90a1f2d7 663 EVP_CIPHER_free(evp_cipher);
4b45c6e5
RS
664 OPENSSL_clear_free(ek, eklen);
665 OPENSSL_clear_free(tkey, tkeylen);
666 BIO_free_all(out);
667 BIO_free_all(btmp);
668 BIO_free_all(etmp);
669 BIO_free_all(bio);
02e112a8 670 return NULL;
0f113f3e 671}
d02b48c6 672
c5a55463 673static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
0f113f3e
MC
674{
675 for (;;) {
676 bio = BIO_find_type(bio, BIO_TYPE_MD);
677 if (bio == NULL) {
678 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
679 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
680 return NULL;
681 }
682 BIO_get_md_ctx(bio, pmd);
683 if (*pmd == NULL) {
684 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
685 return NULL;
686 }
687 if (EVP_MD_CTX_type(*pmd) == nid)
688 return bio;
689 bio = BIO_next(bio);
690 }
691 return NULL;
692}
c5a55463 693
76fa8f18 694static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
0f113f3e
MC
695{
696 unsigned char md_data[EVP_MAX_MD_SIZE];
697 unsigned int md_len;
698
699 /* Add signing time if not already present */
700 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
701 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
702 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
703 return 0;
704 }
705 }
706
707 /* Add digest */
708 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
709 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
710 return 0;
711 }
712 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
713 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
714 return 0;
715 }
716
717 /* Now sign the attributes */
718 if (!PKCS7_SIGNER_INFO_sign(si))
719 return 0;
720
721 return 1;
722}
723
6b691a5c 724int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
0f113f3e
MC
725{
726 int ret = 0;
727 int i, j;
728 BIO *btmp;
729 PKCS7_SIGNER_INFO *si;
6e59a892 730 EVP_MD_CTX *mdc, *ctx_tmp;
0f113f3e
MC
731 STACK_OF(X509_ATTRIBUTE) *sk;
732 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
733 ASN1_OCTET_STRING *os = NULL;
90a1f2d7 734 const PKCS7_CTX *p7_ctx;
0f113f3e 735
c225c3cf
EK
736 if (p7 == NULL) {
737 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
738 return 0;
739 }
740
90a1f2d7
SL
741 p7_ctx = pkcs7_get0_ctx(p7);
742
c225c3cf
EK
743 if (p7->d.ptr == NULL) {
744 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
745 return 0;
746 }
747
bfb0641f 748 ctx_tmp = EVP_MD_CTX_new();
6e59a892
RL
749 if (ctx_tmp == NULL) {
750 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
751 return 0;
752 }
753
0f113f3e
MC
754 i = OBJ_obj2nid(p7->type);
755 p7->state = PKCS7_S_HEADER;
756
757 switch (i) {
758 case NID_pkcs7_data:
759 os = p7->d.data;
760 break;
761 case NID_pkcs7_signedAndEnveloped:
762 /* XXXXXXXXXXXXXXXX */
763 si_sk = p7->d.signed_and_enveloped->signer_info;
764 os = p7->d.signed_and_enveloped->enc_data->enc_data;
90945fa3 765 if (os == NULL) {
f422a514 766 os = ASN1_OCTET_STRING_new();
90945fa3 767 if (os == NULL) {
0f113f3e
MC
768 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
769 goto err;
770 }
771 p7->d.signed_and_enveloped->enc_data->enc_data = os;
772 }
773 break;
774 case NID_pkcs7_enveloped:
775 /* XXXXXXXXXXXXXXXX */
776 os = p7->d.enveloped->enc_data->enc_data;
90945fa3 777 if (os == NULL) {
f422a514 778 os = ASN1_OCTET_STRING_new();
90945fa3 779 if (os == NULL) {
0f113f3e
MC
780 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
781 goto err;
782 }
783 p7->d.enveloped->enc_data->enc_data = os;
784 }
785 break;
786 case NID_pkcs7_signed:
787 si_sk = p7->d.sign->signer_info;
788 os = PKCS7_get_octet_string(p7->d.sign->contents);
789 /* If detached data then the content is excluded */
790 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
f422a514 791 ASN1_OCTET_STRING_free(os);
c225c3cf 792 os = NULL;
0f113f3e
MC
793 p7->d.sign->contents->d.data = NULL;
794 }
795 break;
796
797 case NID_pkcs7_digest:
798 os = PKCS7_get_octet_string(p7->d.digest->contents);
799 /* If detached data then the content is excluded */
800 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
f422a514 801 ASN1_OCTET_STRING_free(os);
c225c3cf 802 os = NULL;
0f113f3e
MC
803 p7->d.digest->contents->d.data = NULL;
804 }
805 break;
806
807 default:
808 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
809 goto err;
810 }
811
812 if (si_sk != NULL) {
813 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
814 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
815 if (si->pkey == NULL)
816 continue;
817
818 j = OBJ_obj2nid(si->digest_alg->algorithm);
819
820 btmp = bio;
821
822 btmp = PKCS7_find_digest(&mdc, btmp, j);
823
824 if (btmp == NULL)
825 goto err;
826
827 /*
828 * We now have the EVP_MD_CTX, lets do the signing.
829 */
6e59a892 830 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
0f113f3e
MC
831 goto err;
832
833 sk = si->auth_attr;
834
835 /*
836 * If there are attributes, we add the digest attribute and only
837 * sign the attributes
838 */
839 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
6e59a892 840 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
0f113f3e
MC
841 goto err;
842 } else {
843 unsigned char *abuf = NULL;
844 unsigned int abuflen;
845 abuflen = EVP_PKEY_size(si->pkey);
846 abuf = OPENSSL_malloc(abuflen);
90945fa3 847 if (abuf == NULL)
0f113f3e
MC
848 goto err;
849
90a1f2d7
SL
850 if (!EVP_SignFinal_with_libctx(ctx_tmp, abuf, &abuflen, si->pkey,
851 p7_ctx->libctx, p7_ctx->propq)) {
d54ac5c4 852 OPENSSL_free(abuf);
0f113f3e
MC
853 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
854 goto err;
855 }
856 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
857 }
858 }
859 } else if (i == NID_pkcs7_digest) {
860 unsigned char md_data[EVP_MAX_MD_SIZE];
861 unsigned int md_len;
862 if (!PKCS7_find_digest(&mdc, bio,
863 OBJ_obj2nid(p7->d.digest->md->algorithm)))
864 goto err;
865 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
866 goto err;
d356dc56
MC
867 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
868 goto err;
0f113f3e
MC
869 }
870
c225c3cf 871 if (!PKCS7_is_detached(p7)) {
0f113f3e 872 /*
c225c3cf
EK
873 * NOTE(emilia): I think we only reach os == NULL here because detached
874 * digested data support is broken.
0f113f3e 875 */
c225c3cf
EK
876 if (os == NULL)
877 goto err;
878 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
879 char *cont;
880 long contlen;
881 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
882 if (btmp == NULL) {
883 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
884 goto err;
885 }
886 contlen = BIO_get_mem_data(btmp, &cont);
887 /*
888 * Mark the BIO read only then we can use its copy of the data
889 * instead of making an extra copy.
890 */
891 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
892 BIO_set_mem_eof_return(btmp, 0);
893 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
894 }
0f113f3e
MC
895 }
896 ret = 1;
897 err:
bfb0641f 898 EVP_MD_CTX_free(ctx_tmp);
26a7d938 899 return ret;
0f113f3e 900}
d02b48c6 901
76fa8f18 902int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
0f113f3e 903{
6e59a892 904 EVP_MD_CTX *mctx;
e6803117 905 EVP_PKEY_CTX *pctx = NULL;
0f113f3e
MC
906 unsigned char *abuf = NULL;
907 int alen;
908 size_t siglen;
909 const EVP_MD *md = NULL;
90a1f2d7 910 const PKCS7_CTX *ctx = si->ctx;
0f113f3e
MC
911
912 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
913 if (md == NULL)
914 return 0;
915
bfb0641f 916 mctx = EVP_MD_CTX_new();
6e59a892 917 if (mctx == NULL) {
90a1f2d7 918 PKCS7err(0, ERR_R_MALLOC_FAILURE);
6e59a892
RL
919 goto err;
920 }
921
90a1f2d7
SL
922 if (EVP_DigestSignInit_with_libctx(mctx, &pctx,
923 EVP_MD_name(md), ctx->libctx, ctx->propq,
924 si->pkey) <= 0)
0f113f3e
MC
925 goto err;
926
dfcb5d29
MC
927 /*
928 * TODO(3.0): This causes problems when providers are in use, so disabled
929 * for now. Can we get rid of this completely? AFAICT this ctrl has never
930 * been used since it was first put in. All internal implementations just
931 * return 1 and ignore this ctrl and have always done so by the looks of
932 * things. To fix this we could convert this ctrl into a param, which would
933 * require us to send all the signer info data as a set of params...but that
934 * is non-trivial and since this isn't used by anything it may be better
935 * just to remove it. The original commit that added it had this
936 * justification in CHANGES:
937 *
938 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
939 * EVP_PKEY_METHOD before and after signing via the
940 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
941 * before and/or after signing if necessary."
942 */
943#if 0
0f113f3e
MC
944 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
945 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
90a1f2d7 946 PKCS7err(0, PKCS7_R_CTRL_ERROR);
0f113f3e
MC
947 goto err;
948 }
dfcb5d29 949#endif
0f113f3e
MC
950
951 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
952 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
953 if (!abuf)
954 goto err;
6e59a892 955 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
0f113f3e
MC
956 goto err;
957 OPENSSL_free(abuf);
958 abuf = NULL;
6e59a892 959 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
0f113f3e
MC
960 goto err;
961 abuf = OPENSSL_malloc(siglen);
90945fa3 962 if (abuf == NULL)
0f113f3e 963 goto err;
6e59a892 964 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
0f113f3e
MC
965 goto err;
966
dfcb5d29
MC
967 /*
968 * TODO(3.0): This causes problems when providers are in use, so disabled
969 * for now. Can we get rid of this completely? AFAICT this ctrl has never
970 * been used since it was first put in. All internal implementations just
971 * return 1 and ignore this ctrl and have always done so by the looks of
972 * things. To fix this we could convert this ctrl into a param, which would
973 * require us to send all the signer info data as a set of params...but that
974 * is non-trivial and since this isn't used by anything it may be better
975 * just to remove it. The original commit that added it had this
976 * justification in CHANGES:
977 *
978 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
979 * EVP_PKEY_METHOD before and after signing via the
980 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
981 * before and/or after signing if necessary."
982 */
983#if 0
0f113f3e
MC
984 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
985 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
90a1f2d7 986 PKCS7err(0, PKCS7_R_CTRL_ERROR);
0f113f3e
MC
987 goto err;
988 }
dfcb5d29 989#endif
0f113f3e 990
bfb0641f 991 EVP_MD_CTX_free(mctx);
0f113f3e
MC
992
993 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
994
995 return 1;
996
997 err:
b548a1f1 998 OPENSSL_free(abuf);
bfb0641f 999 EVP_MD_CTX_free(mctx);
0f113f3e 1000 return 0;
0f113f3e 1001}
76fa8f18 1002
6b691a5c 1003int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
0f113f3e
MC
1004 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
1005{
1006 PKCS7_ISSUER_AND_SERIAL *ias;
1007 int ret = 0, i;
1008 STACK_OF(X509) *cert;
1009 X509 *x509;
1010
c225c3cf
EK
1011 if (p7 == NULL) {
1012 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
1013 return 0;
1014 }
1015
1016 if (p7->d.ptr == NULL) {
1017 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
1018 return 0;
1019 }
1020
0f113f3e
MC
1021 if (PKCS7_type_is_signed(p7)) {
1022 cert = p7->d.sign->cert;
1023 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
1024 cert = p7->d.signed_and_enveloped->cert;
1025 } else {
1026 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1027 goto err;
1028 }
1029 /* XXXXXXXXXXXXXXXXXXXXXXX */
1030 ias = si->issuer_and_serial;
1031
1032 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
1033
1034 /* were we able to find the cert in passed to us */
1035 if (x509 == NULL) {
1036 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
1037 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
1038 goto err;
1039 }
1040
1041 /* Lets verify */
1042 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
1043 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1044 goto err;
1045 }
1046 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1047 i = X509_verify_cert(ctx);
1048 if (i <= 0) {
1049 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1050 X509_STORE_CTX_cleanup(ctx);
1051 goto err;
1052 }
1053 X509_STORE_CTX_cleanup(ctx);
1054
1055 return PKCS7_signatureVerify(bio, p7, si, x509);
1056 err:
1057 return ret;
1058}
170afce5
DSH
1059
1060int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
0f113f3e 1061 X509 *x509)
dfeab068 1062{
0f113f3e 1063 ASN1_OCTET_STRING *os;
6e59a892 1064 EVP_MD_CTX *mdc_tmp, *mdc;
bd1bbbfe 1065 const EVP_MD *md;
90a1f2d7 1066 EVP_MD *fetched_md = NULL;
0f113f3e
MC
1067 int ret = 0, i;
1068 int md_type;
1069 STACK_OF(X509_ATTRIBUTE) *sk;
1070 BIO *btmp;
1071 EVP_PKEY *pkey;
90a1f2d7 1072 const PKCS7_CTX *ctx = pkcs7_get0_ctx(p7);
0f113f3e 1073
bfb0641f 1074 mdc_tmp = EVP_MD_CTX_new();
6e59a892
RL
1075 if (mdc_tmp == NULL) {
1076 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
1077 goto err;
1078 }
0f113f3e
MC
1079
1080 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1081 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1082 goto err;
1083 }
1084
1085 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1086
1087 btmp = bio;
1088 for (;;) {
1089 if ((btmp == NULL) ||
1090 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1091 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1092 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1093 goto err;
1094 }
1095 BIO_get_md_ctx(btmp, &mdc);
1096 if (mdc == NULL) {
1097 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1098 goto err;
1099 }
1100 if (EVP_MD_CTX_type(mdc) == md_type)
1101 break;
1102 /*
1103 * Workaround for some broken clients that put the signature OID
1104 * instead of the digest OID in digest_alg->algorithm
1105 */
1106 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1107 break;
1108 btmp = BIO_next(btmp);
1109 }
1110
1111 /*
1112 * mdc is the digest ctx that we want, unless there are attributes, in
1113 * which case the digest is the signed attributes
1114 */
6e59a892 1115 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
0f113f3e
MC
1116 goto err;
1117
1118 sk = si->auth_attr;
1119 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1120 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1121 unsigned int md_len;
1122 int alen;
1123 ASN1_OCTET_STRING *message_digest;
1124
6e59a892 1125 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
0f113f3e
MC
1126 goto err;
1127 message_digest = PKCS7_digest_from_attributes(sk);
1128 if (!message_digest) {
1129 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1130 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1131 goto err;
1132 }
1133 if ((message_digest->length != (int)md_len) ||
1134 (memcmp(message_digest->data, md_dat, md_len))) {
0f113f3e
MC
1135 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1136 ret = -1;
1137 goto err;
1138 }
1139
bd1bbbfe 1140 (void)ERR_set_mark();
90a1f2d7 1141 fetched_md = EVP_MD_fetch(ctx->libctx, OBJ_nid2sn(md_type), ctx->propq);
bd1bbbfe
DB
1142
1143 if (fetched_md != NULL)
1144 md = fetched_md;
1145 else
1146 md = EVP_get_digestbynid(md_type);
1147
1148 if (md == NULL || !EVP_VerifyInit_ex(mdc_tmp, md, NULL)) {
1149 (void)ERR_clear_last_mark();
0f113f3e 1150 goto err;
bd1bbbfe
DB
1151 }
1152 (void)ERR_pop_to_mark();
0f113f3e
MC
1153
1154 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1155 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1156 if (alen <= 0) {
1157 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1158 ret = -1;
1159 goto err;
1160 }
6e59a892 1161 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
0f113f3e
MC
1162 goto err;
1163
1164 OPENSSL_free(abuf);
1165 }
1166
1167 os = si->enc_digest;
8382fd3a 1168 pkey = X509_get0_pubkey(x509);
12a765a5 1169 if (pkey == NULL) {
0f113f3e
MC
1170 ret = -1;
1171 goto err;
1172 }
1173
90a1f2d7
SL
1174 i = EVP_VerifyFinal_with_libctx(mdc_tmp, os->data, os->length, pkey,
1175 ctx->libctx, ctx->propq);
0f113f3e
MC
1176 if (i <= 0) {
1177 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1178 ret = -1;
1179 goto err;
c5ba2d99
RS
1180 }
1181 ret = 1;
0f113f3e 1182 err:
bfb0641f 1183 EVP_MD_CTX_free(mdc_tmp);
90a1f2d7 1184 EVP_MD_free(fetched_md);
26a7d938 1185 return ret;
0f113f3e 1186}
d02b48c6 1187
6b691a5c 1188PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
0f113f3e
MC
1189{
1190 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1191 PKCS7_RECIP_INFO *ri;
1192 int i;
1193
1194 i = OBJ_obj2nid(p7->type);
1195 if (i != NID_pkcs7_signedAndEnveloped)
1196 return NULL;
1197 if (p7->d.signed_and_enveloped == NULL)
1198 return NULL;
1199 rsk = p7->d.signed_and_enveloped->recipientinfo;
1200 if (rsk == NULL)
1201 return NULL;
0f113f3e 1202 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
26a7d938 1203 return NULL;
0f113f3e 1204 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
26a7d938 1205 return ri->issuer_and_serial;
0f113f3e 1206}
dfeab068 1207
6b691a5c 1208ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
0f113f3e 1209{
26a7d938 1210 return get_attribute(si->auth_attr, nid);
0f113f3e 1211}
dfeab068 1212
6b691a5c 1213ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
0f113f3e 1214{
26a7d938 1215 return get_attribute(si->unauth_attr, nid);
0f113f3e 1216}
dfeab068 1217
b6436ff2 1218static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
0f113f3e 1219{
9b0a4531 1220 int idx;
0f113f3e 1221 X509_ATTRIBUTE *xa;
9b0a4531
DSH
1222 idx = X509at_get_attr_by_NID(sk, nid, -1);
1223 xa = X509at_get_attr(sk, idx);
1224 return X509_ATTRIBUTE_get0_type(xa, 0);
0f113f3e 1225}
dfeab068 1226
b6436ff2 1227ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
10243d97 1228{
0f113f3e 1229 ASN1_TYPE *astype;
75ebbd9a 1230 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
0f113f3e
MC
1231 return NULL;
1232 return astype->value.octet_string;
10243d97 1233}
dfeab068 1234
b6436ff2 1235int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
0f113f3e
MC
1236 STACK_OF(X509_ATTRIBUTE) *sk)
1237{
1238 int i;
1239
222561fe 1240 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
0f113f3e
MC
1241 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1242 if (p7si->auth_attr == NULL)
1243 return 0;
1244 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1245 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1246 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1247 (sk, i))))
1248 == NULL)
26a7d938 1249 return 0;
0f113f3e 1250 }
208fb891 1251 return 1;
0f113f3e
MC
1252}
1253
1254int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1255 STACK_OF(X509_ATTRIBUTE) *sk)
1256{
1257 int i;
1258
222561fe 1259 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
0f113f3e
MC
1260 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1261 if (p7si->unauth_attr == NULL)
1262 return 0;
1263 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1264 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1265 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1266 (sk, i))))
1267 == NULL)
26a7d938 1268 return 0;
0f113f3e 1269 }
208fb891 1270 return 1;
0f113f3e 1271}
dfeab068 1272
6b691a5c 1273int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
0f113f3e
MC
1274 void *value)
1275{
26a7d938 1276 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
0f113f3e 1277}
dfeab068 1278
6b691a5c 1279int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
0f113f3e
MC
1280 void *value)
1281{
26a7d938 1282 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
0f113f3e 1283}
dfeab068 1284
b6436ff2 1285static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
0f113f3e
MC
1286 void *value)
1287{
1288 X509_ATTRIBUTE *attr = NULL;
1289
1290 if (*sk == NULL) {
75ebbd9a 1291 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
0f113f3e
MC
1292 return 0;
1293 new_attrib:
75ebbd9a 1294 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
0f113f3e
MC
1295 return 0;
1296 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1297 X509_ATTRIBUTE_free(attr);
1298 return 0;
1299 }
1300 } else {
1301 int i;
1302
1303 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1304 attr = sk_X509_ATTRIBUTE_value(*sk, i);
9b0a4531 1305 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
0f113f3e
MC
1306 X509_ATTRIBUTE_free(attr);
1307 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1308 if (attr == NULL)
1309 return 0;
1310 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1311 X509_ATTRIBUTE_free(attr);
1312 return 0;
1313 }
1314 goto end;
1315 }
1316 }
1317 goto new_attrib;
1318 }
1319 end:
208fb891 1320 return 1;
0f113f3e 1321}