1/*
2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
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
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/rand.h>
13#include <openssl/objects.h>
14#include <openssl/x509.h>
15#include <openssl/x509v3.h>
16#include <openssl/err.h>
17
18static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
19 void *value);
20static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
21
22static int PKCS7_type_is_other(PKCS7 *p7)
23{
24 int isOther = 1;
25
26 int nid = OBJ_obj2nid(p7->type);
27
28 switch (nid) {
29 case NID_pkcs7_data:
30 case NID_pkcs7_signed:
31 case NID_pkcs7_enveloped:
32 case NID_pkcs7_signedAndEnveloped:
33 case NID_pkcs7_digest:
34 case NID_pkcs7_encrypted:
35 isOther = 0;
36 break;
37 default:
38 isOther = 1;
39 }
40
41 return isOther;
42
43}
44
45static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
46{
47 if (PKCS7_type_is_data(p7))
48 return p7->d.data;
49 if (PKCS7_type_is_other(p7) && p7->d.other
50 && (p7->d.other->type == V_ASN1_OCTET_STRING))
51 return p7->d.other->value.octet_string;
52 return NULL;
53}
54
55static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
56{
57 BIO *btmp;
58 const EVP_MD *md;
59 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
60 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
61 goto err;
62 }
63
64 md = EVP_get_digestbyobj(alg->algorithm);
65 if (md == NULL) {
66 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
67 goto err;
68 }
69
70 BIO_set_md(btmp, md);
71 if (*pbio == NULL)
72 *pbio = btmp;
73 else if (!BIO_push(*pbio, btmp)) {
74 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
75 goto err;
76 }
77 btmp = NULL;
78
79 return 1;
80
81 err:
82 BIO_free(btmp);
83 return 0;
84
85}
86
87static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
88 unsigned char *key, int keylen)
89{
90 EVP_PKEY_CTX *pctx = NULL;
91 EVP_PKEY *pkey = NULL;
92 unsigned char *ek = NULL;
93 int ret = 0;
94 size_t eklen;
95
96 pkey = X509_get0_pubkey(ri->cert);
97 if (pkey == NULL)
98 return 0;
99
100 pctx = EVP_PKEY_CTX_new(pkey, NULL);
101 if (pctx == NULL)
102 return 0;
103
104 if (EVP_PKEY_encrypt_init(pctx) <= 0)
105 goto err;
106
107 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
108 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
109 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
110 goto err;
111 }
112
113 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
114 goto err;
115
116 ek = OPENSSL_malloc(eklen);
117
118 if (ek == NULL) {
119 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
120 goto err;
121 }
122
123 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
124 goto err;
125
126 ASN1_STRING_set0(ri->enc_key, ek, eklen);
127 ek = NULL;
128
129 ret = 1;
130
131 err:
132 EVP_PKEY_CTX_free(pctx);
133 OPENSSL_free(ek);
134 return ret;
135
136}
137
138static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
139 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
140 size_t fixlen)
141{
142 EVP_PKEY_CTX *pctx = NULL;
143 unsigned char *ek = NULL;
144 size_t eklen;
145 int ret = -1;
146
147 pctx = EVP_PKEY_CTX_new(pkey, NULL);
148 if (pctx == NULL)
149 return -1;
150
151 if (EVP_PKEY_decrypt_init(pctx) <= 0)
152 goto err;
153
154 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
155 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
156 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
157 goto err;
158 }
159
160 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
161 ri->enc_key->data, ri->enc_key->length) <= 0)
162 goto err;
163
164 ek = OPENSSL_malloc(eklen);
165
166 if (ek == NULL) {
167 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
168 goto err;
169 }
170
171 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
172 ri->enc_key->data, ri->enc_key->length) <= 0
173 || eklen == 0
174 || (fixlen != 0 && eklen != fixlen)) {
175 ret = 0;
176 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
177 goto err;
178 }
179
180 ret = 1;
181
182 OPENSSL_clear_free(*pek, *peklen);
183 *pek = ek;
184 *peklen = eklen;
185
186 err:
187 EVP_PKEY_CTX_free(pctx);
188 if (!ret)
189 OPENSSL_free(ek);
190
191 return ret;
192}
193
194BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
195{
196 int i;
197 BIO *out = NULL, *btmp = NULL;
198 X509_ALGOR *xa = NULL;
199 const EVP_CIPHER *evp_cipher = NULL;
200 STACK_OF(X509_ALGOR) *md_sk = NULL;
201 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
202 X509_ALGOR *xalg = NULL;
203 PKCS7_RECIP_INFO *ri = NULL;
204 ASN1_OCTET_STRING *os = NULL;
205
206 if (p7 == NULL) {
207 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
208 return NULL;
209 }
210 /*
211 * The content field in the PKCS7 ContentInfo is optional, but that really
212 * only applies to inner content (precisely, detached signatures).
213 *
214 * When reading content, missing outer content is therefore treated as an
215 * error.
216 *
217 * When creating content, PKCS7_content_new() must be called before
218 * calling this method, so a NULL p7->d is always an error.
219 */
220 if (p7->d.ptr == NULL) {
221 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
222 return NULL;
223 }
224
225 i = OBJ_obj2nid(p7->type);
226 p7->state = PKCS7_S_HEADER;
227
228 switch (i) {
229 case NID_pkcs7_signed:
230 md_sk = p7->d.sign->md_algs;
231 os = PKCS7_get_octet_string(p7->d.sign->contents);
232 break;
233 case NID_pkcs7_signedAndEnveloped:
234 rsk = p7->d.signed_and_enveloped->recipientinfo;
235 md_sk = p7->d.signed_and_enveloped->md_algs;
236 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
237 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
238 if (evp_cipher == NULL) {
239 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
240 goto err;
241 }
242 break;
243 case NID_pkcs7_enveloped:
244 rsk = p7->d.enveloped->recipientinfo;
245 xalg = p7->d.enveloped->enc_data->algorithm;
246 evp_cipher = p7->d.enveloped->enc_data->cipher;
247 if (evp_cipher == NULL) {
248 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
249 goto err;
250 }
251 break;
252 case NID_pkcs7_digest:
253 xa = p7->d.digest->md;
254 os = PKCS7_get_octet_string(p7->d.digest->contents);
255 break;
256 case NID_pkcs7_data:
257 break;
258 default:
259 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
260 goto err;
261 }
262
263 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
264 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
265 goto err;
266
267 if (xa && !PKCS7_bio_add_digest(&out, xa))
268 goto err;
269
270 if (evp_cipher != NULL) {
271 unsigned char key[EVP_MAX_KEY_LENGTH];
272 unsigned char iv[EVP_MAX_IV_LENGTH];
273 int keylen, ivlen;
274 EVP_CIPHER_CTX *ctx;
275
276 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
277 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
278 goto err;
279 }
280 BIO_get_cipher_ctx(btmp, &ctx);
281 keylen = EVP_CIPHER_key_length(evp_cipher);
282 ivlen = EVP_CIPHER_iv_length(evp_cipher);
283 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
284 if (ivlen > 0)
285 if (RAND_bytes(iv, ivlen) <= 0)
286 goto err;
287 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
288 goto err;
289 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
290 goto err;
291 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
292 goto err;
293
294 if (ivlen > 0) {
295 if (xalg->parameter == NULL) {
296 xalg->parameter = ASN1_TYPE_new();
297 if (xalg->parameter == NULL)
298 goto err;
299 }
300 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
301 goto err;
302 }
303
304 /* Lets do the pub key stuff :-) */
305 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
306 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
307 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
308 goto err;
309 }
310 OPENSSL_cleanse(key, keylen);
311
312 if (out == NULL)
313 out = btmp;
314 else
315 BIO_push(out, btmp);
316 btmp = NULL;
317 }
318
319 if (bio == NULL) {
320 if (PKCS7_is_detached(p7)) {
321 bio = BIO_new(BIO_s_null());
322 } else if (os && os->length > 0) {
323 bio = BIO_new_mem_buf(os->data, os->length);
324 } else {
325 bio = BIO_new(BIO_s_mem());
326 if (bio == NULL)
327 goto err;
328 BIO_set_mem_eof_return(bio, 0);
329 }
330 if (bio == NULL)
331 goto err;
332 }
333 if (out)
334 BIO_push(out, bio);
335 else
336 out = bio;
337 return out;
338
339 err:
340 BIO_free_all(out);
341 BIO_free_all(btmp);
342 return NULL;
343}
344
345static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
346{
347 int ret;
348 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
349 X509_get_issuer_name(pcert));
350 if (ret)
351 return ret;
352 return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
353 ri->issuer_and_serial->serial);
354}
355
356/* int */
357BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
358{
359 int i, j;
360 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
361 X509_ALGOR *xa;
362 ASN1_OCTET_STRING *data_body = NULL;
363 const EVP_MD *evp_md;
364 const EVP_CIPHER *evp_cipher = NULL;
365 EVP_CIPHER_CTX *evp_ctx = NULL;
366 X509_ALGOR *enc_alg = NULL;
367 STACK_OF(X509_ALGOR) *md_sk = NULL;
368 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
369 PKCS7_RECIP_INFO *ri = NULL;
370 unsigned char *ek = NULL, *tkey = NULL;
371 int eklen = 0, tkeylen = 0;
372
373 if (p7 == NULL) {
374 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
375 return NULL;
376 }
377
378 if (p7->d.ptr == NULL) {
379 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
380 return NULL;
381 }
382
383 i = OBJ_obj2nid(p7->type);
384 p7->state = PKCS7_S_HEADER;
385
386 switch (i) {
387 case NID_pkcs7_signed:
388 /*
389 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
390 * field and optional content.
391 * data_body is NULL if that structure has no (=detached) content
392 * or if the contentType is wrong (i.e., not "data").
393 */
394 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
395 if (!PKCS7_is_detached(p7) && data_body == NULL) {
396 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
397 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
398 goto err;
399 }
400 md_sk = p7->d.sign->md_algs;
401 break;
402 case NID_pkcs7_signedAndEnveloped:
403 rsk = p7->d.signed_and_enveloped->recipientinfo;
404 md_sk = p7->d.signed_and_enveloped->md_algs;
405 /* data_body is NULL if the optional EncryptedContent is missing. */
406 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
407 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
408 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
409 if (evp_cipher == NULL) {
410 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
411 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
412 goto err;
413 }
414 break;
415 case NID_pkcs7_enveloped:
416 rsk = p7->d.enveloped->recipientinfo;
417 enc_alg = p7->d.enveloped->enc_data->algorithm;
418 /* data_body is NULL if the optional EncryptedContent is missing. */
419 data_body = p7->d.enveloped->enc_data->enc_data;
420 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
421 if (evp_cipher == NULL) {
422 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
423 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
424 goto err;
425 }
426 break;
427 default:
428 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
429 goto err;
430 }
431
432 /* Detached content must be supplied via in_bio instead. */
433 if (data_body == NULL && in_bio == NULL) {
434 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
435 goto err;
436 }
437
438 /* We will be checking the signature */
439 if (md_sk != NULL) {
440 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
441 xa = sk_X509_ALGOR_value(md_sk, i);
442 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
443 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
444 goto err;
445 }
446
447 j = OBJ_obj2nid(xa->algorithm);
448 evp_md = EVP_get_digestbynid(j);
449 if (evp_md == NULL) {
450 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
451 PKCS7_R_UNKNOWN_DIGEST_TYPE);
452 goto err;
453 }
454
455 BIO_set_md(btmp, evp_md);
456 if (out == NULL)
457 out = btmp;
458 else
459 BIO_push(out, btmp);
460 btmp = NULL;
461 }
462 }
463
464 if (evp_cipher != NULL) {
465 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
466 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
467 goto err;
468 }
469
470 /*
471 * It was encrypted, we need to decrypt the secret key with the
472 * private key
473 */
474
475 /*
476 * Find the recipientInfo which matches the passed certificate (if
477 * any)
478 */
479
480 if (pcert) {
481 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
482 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
483 if (!pkcs7_cmp_ri(ri, pcert))
484 break;
485 ri = NULL;
486 }
487 if (ri == NULL) {
488 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
489 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
490 goto err;
491 }
492 }
493
494 /* If we haven't got a certificate try each ri in turn */
495 if (pcert == NULL) {
496 /*
497 * Always attempt to decrypt all rinfo even after success as a
498 * defence against MMA timing attacks.
499 */
500 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
501 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
502
503 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
504 EVP_CIPHER_key_length(evp_cipher)) < 0)
505 goto err;
506 ERR_clear_error();
507 }
508 } else {
509 /* Only exit on fatal errors, not decrypt failure */
510 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
511 goto err;
512 ERR_clear_error();
513 }
514
515 evp_ctx = NULL;
516 BIO_get_cipher_ctx(etmp, &evp_ctx);
517 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
518 goto err;
519 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
520 goto err;
521 /* Generate random key as MMA defence */
522 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
523 tkey = OPENSSL_malloc(tkeylen);
524 if (tkey == NULL)
525 goto err;
526 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
527 goto err;
528 if (ek == NULL) {
529 ek = tkey;
530 eklen = tkeylen;
531 tkey = NULL;
532 }
533
534 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
535 /*
536 * Some S/MIME clients don't use the same key and effective key
537 * length. The key length is determined by the size of the
538 * decrypted RSA key.
539 */
540 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
541 /* Use random key as MMA defence */
542 OPENSSL_clear_free(ek, eklen);
543 ek = tkey;
544 eklen = tkeylen;
545 tkey = NULL;
546 }
547 }
548 /* Clear errors so we don't leak information useful in MMA */
549 ERR_clear_error();
550 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
551 goto err;
552
553 OPENSSL_clear_free(ek, eklen);
554 ek = NULL;
555 OPENSSL_clear_free(tkey, tkeylen);
556 tkey = NULL;
557
558 if (out == NULL)
559 out = etmp;
560 else
561 BIO_push(out, etmp);
562 etmp = NULL;
563 }
564 if (in_bio != NULL) {
565 bio = in_bio;
566 } else {
567 if (data_body->length > 0)
568 bio = BIO_new_mem_buf(data_body->data, data_body->length);
569 else {
570 bio = BIO_new(BIO_s_mem());
571 if (bio == NULL)
572 goto err;
573 BIO_set_mem_eof_return(bio, 0);
574 }
575 if (bio == NULL)
576 goto err;
577 }
578 BIO_push(out, bio);
579 bio = NULL;
580 return out;
581
582 err:
583 OPENSSL_clear_free(ek, eklen);
584 OPENSSL_clear_free(tkey, tkeylen);
585 BIO_free_all(out);
586 BIO_free_all(btmp);
587 BIO_free_all(etmp);
588 BIO_free_all(bio);
589 return NULL;
590}
591
592static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
593{
594 for (;;) {
595 bio = BIO_find_type(bio, BIO_TYPE_MD);
596 if (bio == NULL) {
597 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
598 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
599 return NULL;
600 }
601 BIO_get_md_ctx(bio, pmd);
602 if (*pmd == NULL) {
603 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
604 return NULL;
605 }
606 if (EVP_MD_CTX_type(*pmd) == nid)
607 return bio;
608 bio = BIO_next(bio);
609 }
610 return NULL;
611}
612
613static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
614{
615 unsigned char md_data[EVP_MAX_MD_SIZE];
616 unsigned int md_len;
617
618 /* Add signing time if not already present */
619 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
620 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
621 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
622 return 0;
623 }
624 }
625
626 /* Add digest */
627 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
628 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
629 return 0;
630 }
631 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
632 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
633 return 0;
634 }
635
636 /* Now sign the attributes */
637 if (!PKCS7_SIGNER_INFO_sign(si))
638 return 0;
639
640 return 1;
641}
642
643int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
644{
645 int ret = 0;
646 int i, j;
647 BIO *btmp;
648 PKCS7_SIGNER_INFO *si;
649 EVP_MD_CTX *mdc, *ctx_tmp;
650 STACK_OF(X509_ATTRIBUTE) *sk;
651 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
652 ASN1_OCTET_STRING *os = NULL;
653
654 if (p7 == NULL) {
655 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
656 return 0;
657 }
658
659 if (p7->d.ptr == NULL) {
660 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
661 return 0;
662 }
663
664 ctx_tmp = EVP_MD_CTX_new();
665 if (ctx_tmp == NULL) {
666 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
667 return 0;
668 }
669
670 i = OBJ_obj2nid(p7->type);
671 p7->state = PKCS7_S_HEADER;
672
673 switch (i) {
674 case NID_pkcs7_data:
675 os = p7->d.data;
676 break;
677 case NID_pkcs7_signedAndEnveloped:
678 /* XXXXXXXXXXXXXXXX */
679 si_sk = p7->d.signed_and_enveloped->signer_info;
680 os = p7->d.signed_and_enveloped->enc_data->enc_data;
681 if (os == NULL) {
682 os = ASN1_OCTET_STRING_new();
683 if (os == NULL) {
684 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
685 goto err;
686 }
687 p7->d.signed_and_enveloped->enc_data->enc_data = os;
688 }
689 break;
690 case NID_pkcs7_enveloped:
691 /* XXXXXXXXXXXXXXXX */
692 os = p7->d.enveloped->enc_data->enc_data;
693 if (os == NULL) {
694 os = ASN1_OCTET_STRING_new();
695 if (os == NULL) {
696 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
697 goto err;
698 }
699 p7->d.enveloped->enc_data->enc_data = os;
700 }
701 break;
702 case NID_pkcs7_signed:
703 si_sk = p7->d.sign->signer_info;
704 os = PKCS7_get_octet_string(p7->d.sign->contents);
705 /* If detached data then the content is excluded */
706 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
707 ASN1_OCTET_STRING_free(os);
708 os = NULL;
709 p7->d.sign->contents->d.data = NULL;
710 }
711 break;
712
713 case NID_pkcs7_digest:
714 os = PKCS7_get_octet_string(p7->d.digest->contents);
715 /* If detached data then the content is excluded */
716 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
717 ASN1_OCTET_STRING_free(os);
718 os = NULL;
719 p7->d.digest->contents->d.data = NULL;
720 }
721 break;
722
723 default:
724 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
725 goto err;
726 }
727
728 if (si_sk != NULL) {
729 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
730 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
731 if (si->pkey == NULL)
732 continue;
733
734 j = OBJ_obj2nid(si->digest_alg->algorithm);
735
736 btmp = bio;
737
738 btmp = PKCS7_find_digest(&mdc, btmp, j);
739
740 if (btmp == NULL)
741 goto err;
742
743 /*
744 * We now have the EVP_MD_CTX, lets do the signing.
745 */
746 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
747 goto err;
748
749 sk = si->auth_attr;
750
751 /*
752 * If there are attributes, we add the digest attribute and only
753 * sign the attributes
754 */
755 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
756 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
757 goto err;
758 } else {
759 unsigned char *abuf = NULL;
760 unsigned int abuflen;
761 abuflen = EVP_PKEY_size(si->pkey);
762 abuf = OPENSSL_malloc(abuflen);
763 if (abuf == NULL)
764 goto err;
765
766 if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
767 OPENSSL_free(abuf);
768 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
769 goto err;
770 }
771 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
772 }
773 }
774 } else if (i == NID_pkcs7_digest) {
775 unsigned char md_data[EVP_MAX_MD_SIZE];
776 unsigned int md_len;
777 if (!PKCS7_find_digest(&mdc, bio,
778 OBJ_obj2nid(p7->d.digest->md->algorithm)))
779 goto err;
780 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
781 goto err;
782 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
783 goto err;
784 }
785
786 if (!PKCS7_is_detached(p7)) {
787 /*
788 * NOTE(emilia): I think we only reach os == NULL here because detached
789 * digested data support is broken.
790 */
791 if (os == NULL)
792 goto err;
793 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
794 char *cont;
795 long contlen;
796 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
797 if (btmp == NULL) {
798 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
799 goto err;
800 }
801 contlen = BIO_get_mem_data(btmp, &cont);
802 /*
803 * Mark the BIO read only then we can use its copy of the data
804 * instead of making an extra copy.
805 */
806 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
807 BIO_set_mem_eof_return(btmp, 0);
808 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
809 }
810 }
811 ret = 1;
812 err:
813 EVP_MD_CTX_free(ctx_tmp);
814 return ret;
815}
816
817int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
818{
819 EVP_MD_CTX *mctx;
820 EVP_PKEY_CTX *pctx = NULL;
821 unsigned char *abuf = NULL;
822 int alen;
823 size_t siglen;
824 const EVP_MD *md = NULL;
825
826 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
827 if (md == NULL)
828 return 0;
829
830 mctx = EVP_MD_CTX_new();
831 if (mctx == NULL) {
832 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
833 goto err;
834 }
835
836 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
837 goto err;
838
839 /*
840 * TODO(3.0): This causes problems when providers are in use, so disabled
841 * for now. Can we get rid of this completely? AFAICT this ctrl has never
842 * been used since it was first put in. All internal implementations just
843 * return 1 and ignore this ctrl and have always done so by the looks of
844 * things. To fix this we could convert this ctrl into a param, which would
845 * require us to send all the signer info data as a set of params...but that
846 * is non-trivial and since this isn't used by anything it may be better
847 * just to remove it. The original commit that added it had this
848 * justification in CHANGES:
849 *
850 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
851 * EVP_PKEY_METHOD before and after signing via the
852 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
853 * before and/or after signing if necessary."
854 */
855#if 0
856 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
857 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
858 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
859 goto err;
860 }
861#endif
862
863 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
864 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
865 if (!abuf)
866 goto err;
867 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
868 goto err;
869 OPENSSL_free(abuf);
870 abuf = NULL;
871 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
872 goto err;
873 abuf = OPENSSL_malloc(siglen);
874 if (abuf == NULL)
875 goto err;
876 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
877 goto err;
878
879 /*
880 * TODO(3.0): This causes problems when providers are in use, so disabled
881 * for now. Can we get rid of this completely? AFAICT this ctrl has never
882 * been used since it was first put in. All internal implementations just
883 * return 1 and ignore this ctrl and have always done so by the looks of
884 * things. To fix this we could convert this ctrl into a param, which would
885 * require us to send all the signer info data as a set of params...but that
886 * is non-trivial and since this isn't used by anything it may be better
887 * just to remove it. The original commit that added it had this
888 * justification in CHANGES:
889 *
890 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
891 * EVP_PKEY_METHOD before and after signing via the
892 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
893 * before and/or after signing if necessary."
894 */
895#if 0
896 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
897 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
898 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
899 goto err;
900 }
901#endif
902
903 EVP_MD_CTX_free(mctx);
904
905 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
906
907 return 1;
908
909 err:
910 OPENSSL_free(abuf);
911 EVP_MD_CTX_free(mctx);
912 return 0;
913
914}
915
916int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
917 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
918{
919 PKCS7_ISSUER_AND_SERIAL *ias;
920 int ret = 0, i;
921 STACK_OF(X509) *cert;
922 X509 *x509;
923
924 if (p7 == NULL) {
925 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
926 return 0;
927 }
928
929 if (p7->d.ptr == NULL) {
930 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
931 return 0;
932 }
933
934 if (PKCS7_type_is_signed(p7)) {
935 cert = p7->d.sign->cert;
936 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
937 cert = p7->d.signed_and_enveloped->cert;
938 } else {
939 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
940 goto err;
941 }
942 /* XXXXXXXXXXXXXXXXXXXXXXX */
943 ias = si->issuer_and_serial;
944
945 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
946
947 /* were we able to find the cert in passed to us */
948 if (x509 == NULL) {
949 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
950 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
951 goto err;
952 }
953
954 /* Lets verify */
955 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
956 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
957 goto err;
958 }
959 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
960 i = X509_verify_cert(ctx);
961 if (i <= 0) {
962 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
963 X509_STORE_CTX_cleanup(ctx);
964 goto err;
965 }
966 X509_STORE_CTX_cleanup(ctx);
967
968 return PKCS7_signatureVerify(bio, p7, si, x509);
969 err:
970 return ret;
971}
972
973int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
974 X509 *x509)
975{
976 ASN1_OCTET_STRING *os;
977 EVP_MD_CTX *mdc_tmp, *mdc;
978 int ret = 0, i;
979 int md_type;
980 STACK_OF(X509_ATTRIBUTE) *sk;
981 BIO *btmp;
982 EVP_PKEY *pkey;
983
984 mdc_tmp = EVP_MD_CTX_new();
985 if (mdc_tmp == NULL) {
986 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
987 goto err;
988 }
989
990 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
991 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
992 goto err;
993 }
994
995 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
996
997 btmp = bio;
998 for (;;) {
999 if ((btmp == NULL) ||
1000 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1001 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1002 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1003 goto err;
1004 }
1005 BIO_get_md_ctx(btmp, &mdc);
1006 if (mdc == NULL) {
1007 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1008 goto err;
1009 }
1010 if (EVP_MD_CTX_type(mdc) == md_type)
1011 break;
1012 /*
1013 * Workaround for some broken clients that put the signature OID
1014 * instead of the digest OID in digest_alg->algorithm
1015 */
1016 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1017 break;
1018 btmp = BIO_next(btmp);
1019 }
1020
1021 /*
1022 * mdc is the digest ctx that we want, unless there are attributes, in
1023 * which case the digest is the signed attributes
1024 */
1025 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1026 goto err;
1027
1028 sk = si->auth_attr;
1029 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1030 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1031 unsigned int md_len;
1032 int alen;
1033 ASN1_OCTET_STRING *message_digest;
1034
1035 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1036 goto err;
1037 message_digest = PKCS7_digest_from_attributes(sk);
1038 if (!message_digest) {
1039 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1040 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1041 goto err;
1042 }
1043 if ((message_digest->length != (int)md_len) ||
1044 (memcmp(message_digest->data, md_dat, md_len))) {
1045 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1046 ret = -1;
1047 goto err;
1048 }
1049
1050 if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1051 goto err;
1052
1053 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1054 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1055 if (alen <= 0) {
1056 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1057 ret = -1;
1058 goto err;
1059 }
1060 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1061 goto err;
1062
1063 OPENSSL_free(abuf);
1064 }
1065
1066 os = si->enc_digest;
1067 pkey = X509_get0_pubkey(x509);
1068 if (pkey == NULL) {
1069 ret = -1;
1070 goto err;
1071 }
1072
1073 i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
1074 if (i <= 0) {
1075 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1076 ret = -1;
1077 goto err;
1078 }
1079 ret = 1;
1080 err:
1081 EVP_MD_CTX_free(mdc_tmp);
1082 return ret;
1083}
1084
1085PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1086{
1087 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1088 PKCS7_RECIP_INFO *ri;
1089 int i;
1090
1091 i = OBJ_obj2nid(p7->type);
1092 if (i != NID_pkcs7_signedAndEnveloped)
1093 return NULL;
1094 if (p7->d.signed_and_enveloped == NULL)
1095 return NULL;
1096 rsk = p7->d.signed_and_enveloped->recipientinfo;
1097 if (rsk == NULL)
1098 return NULL;
1099 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1100 return NULL;
1101 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1102 return ri->issuer_and_serial;
1103}
1104
1105ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1106{
1107 return get_attribute(si->auth_attr, nid);
1108}
1109
1110ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1111{
1112 return get_attribute(si->unauth_attr, nid);
1113}
1114
1115static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1116{
1117 int idx;
1118 X509_ATTRIBUTE *xa;
1119 idx = X509at_get_attr_by_NID(sk, nid, -1);
1120 xa = X509at_get_attr(sk, idx);
1121 return X509_ATTRIBUTE_get0_type(xa, 0);
1122}
1123
1124ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1125{
1126 ASN1_TYPE *astype;
1127 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1128 return NULL;
1129 return astype->value.octet_string;
1130}
1131
1132int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1133 STACK_OF(X509_ATTRIBUTE) *sk)
1134{
1135 int i;
1136
1137 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1138 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1139 if (p7si->auth_attr == NULL)
1140 return 0;
1141 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1142 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1143 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1144 (sk, i))))
1145 == NULL)
1146 return 0;
1147 }
1148 return 1;
1149}
1150
1151int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1152 STACK_OF(X509_ATTRIBUTE) *sk)
1153{
1154 int i;
1155
1156 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1157 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1158 if (p7si->unauth_attr == NULL)
1159 return 0;
1160 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1161 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1162 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1163 (sk, i))))
1164 == NULL)
1165 return 0;
1166 }
1167 return 1;
1168}
1169
1170int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1171 void *value)
1172{
1173 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1174}
1175
1176int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1177 void *value)
1178{
1179 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1180}
1181
1182static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1183 void *value)
1184{
1185 X509_ATTRIBUTE *attr = NULL;
1186
1187 if (*sk == NULL) {
1188 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1189 return 0;
1190 new_attrib:
1191 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1192 return 0;
1193 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1194 X509_ATTRIBUTE_free(attr);
1195 return 0;
1196 }
1197 } else {
1198 int i;
1199
1200 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1201 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1202 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1203 X509_ATTRIBUTE_free(attr);
1204 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1205 if (attr == NULL)
1206 return 0;
1207 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1208 X509_ATTRIBUTE_free(attr);
1209 return 0;
1210 }
1211 goto end;
1212 }
1213 }
1214 goto new_attrib;
1215 }
1216 end:
1217 return 1;
1218}
1219