2 * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* Simple PKCS#7 processing functions */
13 #include "internal/cryptlib.h"
14 #include <openssl/x509.h>
15 #include <openssl/x509v3.h>
16 #include "pk7_local.h"
18 #define BUFFERSIZE 4096
20 DEFINE_STACK_OF(X509_ALGOR
)
21 DEFINE_STACK_OF(PKCS7_SIGNER_INFO
)
23 static int pkcs7_copy_existing_digest(PKCS7
*p7
, PKCS7_SIGNER_INFO
*si
);
25 PKCS7
*PKCS7_sign_with_libctx(X509
*signcert
, EVP_PKEY
*pkey
,
26 STACK_OF(X509
) *certs
, BIO
*data
, int flags
,
27 OPENSSL_CTX
*libctx
, const char *propq
)
32 if ((p7
= PKCS7_new_with_libctx(libctx
, propq
)) == NULL
) {
33 PKCS7err(0, ERR_R_MALLOC_FAILURE
);
37 if (!PKCS7_set_type(p7
, NID_pkcs7_signed
))
40 if (!PKCS7_content_new(p7
, NID_pkcs7_data
))
43 if (pkey
&& !PKCS7_sign_add_signer(p7
, signcert
, pkey
, NULL
, flags
)) {
44 PKCS7err(0, PKCS7_R_PKCS7_ADD_SIGNER_ERROR
);
48 if (!(flags
& PKCS7_NOCERTS
)) {
49 for (i
= 0; i
< sk_X509_num(certs
); i
++) {
50 if (!PKCS7_add_certificate(p7
, sk_X509_value(certs
, i
)))
55 if (flags
& PKCS7_DETACHED
)
56 PKCS7_set_detached(p7
, 1);
58 if (flags
& (PKCS7_STREAM
| PKCS7_PARTIAL
))
61 if (PKCS7_final(p7
, data
, flags
))
69 PKCS7
*PKCS7_sign(X509
*signcert
, EVP_PKEY
*pkey
, STACK_OF(X509
) *certs
,
72 return PKCS7_sign_with_libctx(signcert
, pkey
, certs
, data
, flags
, NULL
, NULL
);
76 int PKCS7_final(PKCS7
*p7
, BIO
*data
, int flags
)
81 if ((p7bio
= PKCS7_dataInit(p7
, NULL
)) == NULL
) {
82 PKCS7err(PKCS7_F_PKCS7_FINAL
, ERR_R_MALLOC_FAILURE
);
86 SMIME_crlf_copy(data
, p7bio
, flags
);
88 (void)BIO_flush(p7bio
);
90 if (!PKCS7_dataFinal(p7
, p7bio
)) {
91 PKCS7err(PKCS7_F_PKCS7_FINAL
, PKCS7_R_PKCS7_DATASIGN
);
102 /* Check to see if a cipher exists and if so add S/MIME capabilities */
104 static int add_cipher_smcap(STACK_OF(X509_ALGOR
) *sk
, int nid
, int arg
)
106 if (EVP_get_cipherbynid(nid
))
107 return PKCS7_simple_smimecap(sk
, nid
, arg
);
111 static int add_digest_smcap(STACK_OF(X509_ALGOR
) *sk
, int nid
, int arg
)
113 if (EVP_get_digestbynid(nid
))
114 return PKCS7_simple_smimecap(sk
, nid
, arg
);
118 PKCS7_SIGNER_INFO
*PKCS7_sign_add_signer(PKCS7
*p7
, X509
*signcert
,
119 EVP_PKEY
*pkey
, const EVP_MD
*md
,
122 PKCS7_SIGNER_INFO
*si
= NULL
;
123 STACK_OF(X509_ALGOR
) *smcap
= NULL
;
125 if (!X509_check_private_key(signcert
, pkey
)) {
126 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER
,
127 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE
);
131 if ((si
= PKCS7_add_signature(p7
, signcert
, pkey
, md
)) == NULL
) {
132 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER
,
133 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR
);
137 si
->ctx
= pkcs7_get0_ctx(p7
);
138 if (!(flags
& PKCS7_NOCERTS
)) {
139 if (!PKCS7_add_certificate(p7
, signcert
))
143 if (!(flags
& PKCS7_NOATTR
)) {
144 if (!PKCS7_add_attrib_content_type(si
, NULL
))
146 /* Add SMIMECapabilities */
147 if (!(flags
& PKCS7_NOSMIMECAP
)) {
148 if ((smcap
= sk_X509_ALGOR_new_null()) == NULL
) {
149 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER
, ERR_R_MALLOC_FAILURE
);
152 if (!add_cipher_smcap(smcap
, NID_aes_256_cbc
, -1)
153 || !add_digest_smcap(smcap
, NID_id_GostR3411_2012_256
, -1)
154 || !add_digest_smcap(smcap
, NID_id_GostR3411_2012_512
, -1)
155 || !add_digest_smcap(smcap
, NID_id_GostR3411_94
, -1)
156 || !add_cipher_smcap(smcap
, NID_id_Gost28147_89
, -1)
157 || !add_cipher_smcap(smcap
, NID_aes_192_cbc
, -1)
158 || !add_cipher_smcap(smcap
, NID_aes_128_cbc
, -1)
159 || !add_cipher_smcap(smcap
, NID_des_ede3_cbc
, -1)
160 || !add_cipher_smcap(smcap
, NID_rc2_cbc
, 128)
161 || !add_cipher_smcap(smcap
, NID_rc2_cbc
, 64)
162 || !add_cipher_smcap(smcap
, NID_des_cbc
, -1)
163 || !add_cipher_smcap(smcap
, NID_rc2_cbc
, 40)
164 || !PKCS7_add_attrib_smimecap(si
, smcap
))
166 sk_X509_ALGOR_pop_free(smcap
, X509_ALGOR_free
);
169 if (flags
& PKCS7_REUSE_DIGEST
) {
170 if (!pkcs7_copy_existing_digest(p7
, si
))
172 if (!(flags
& PKCS7_PARTIAL
)
173 && !PKCS7_SIGNER_INFO_sign(si
))
179 sk_X509_ALGOR_pop_free(smcap
, X509_ALGOR_free
);
184 * Search for a digest matching SignerInfo digest type and if found copy
188 static int pkcs7_copy_existing_digest(PKCS7
*p7
, PKCS7_SIGNER_INFO
*si
)
191 STACK_OF(PKCS7_SIGNER_INFO
) *sinfos
;
192 PKCS7_SIGNER_INFO
*sitmp
;
193 ASN1_OCTET_STRING
*osdig
= NULL
;
194 sinfos
= PKCS7_get_signer_info(p7
);
195 for (i
= 0; i
< sk_PKCS7_SIGNER_INFO_num(sinfos
); i
++) {
196 sitmp
= sk_PKCS7_SIGNER_INFO_value(sinfos
, i
);
199 if (sk_X509_ATTRIBUTE_num(sitmp
->auth_attr
) <= 0)
201 if (!OBJ_cmp(si
->digest_alg
->algorithm
, sitmp
->digest_alg
->algorithm
)) {
202 osdig
= PKCS7_digest_from_attributes(sitmp
->auth_attr
);
209 return PKCS7_add1_attrib_digest(si
, osdig
->data
, osdig
->length
);
211 PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST
,
212 PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND
);
216 int PKCS7_verify(PKCS7
*p7
, STACK_OF(X509
) *certs
, X509_STORE
*store
,
217 BIO
*indata
, BIO
*out
, int flags
)
219 STACK_OF(X509
) *signers
;
221 STACK_OF(PKCS7_SIGNER_INFO
) *sinfos
;
222 PKCS7_SIGNER_INFO
*si
;
223 X509_STORE_CTX
*cert_ctx
= NULL
;
225 int i
, j
= 0, k
, ret
= 0;
227 BIO
*tmpin
= NULL
, *tmpout
= NULL
;
228 const PKCS7_CTX
*p7_ctx
;
231 PKCS7err(0, PKCS7_R_INVALID_NULL_POINTER
);
235 if (!PKCS7_type_is_signed(p7
)) {
236 PKCS7err(0, PKCS7_R_WRONG_CONTENT_TYPE
);
240 /* Check for no data and no content: no data to verify signature */
241 if (PKCS7_get_detached(p7
) && !indata
) {
242 PKCS7err(0, PKCS7_R_NO_CONTENT
);
246 if (flags
& PKCS7_NO_DUAL_CONTENT
) {
248 * This was originally "#if 0" because we thought that only old broken
249 * Netscape did this. It turns out that Authenticode uses this kind
250 * of "extended" PKCS7 format, and things like UEFI secure boot and
251 * tools like osslsigncode need it. In Authenticode the verification
252 * process is different, but the existing PKCs7 verification works.
254 if (!PKCS7_get_detached(p7
) && indata
) {
255 PKCS7err(0, PKCS7_R_CONTENT_AND_DATA_PRESENT
);
260 sinfos
= PKCS7_get_signer_info(p7
);
262 if (!sinfos
|| !sk_PKCS7_SIGNER_INFO_num(sinfos
)) {
263 PKCS7err(0, PKCS7_R_NO_SIGNATURES_ON_DATA
);
267 signers
= PKCS7_get0_signers(p7
, certs
, flags
);
271 /* Now verify the certificates */
272 p7_ctx
= pkcs7_get0_ctx(p7
);
273 cert_ctx
= X509_STORE_CTX_new_with_libctx(p7_ctx
->libctx
, p7_ctx
->propq
);
274 if (cert_ctx
== NULL
)
276 if (!(flags
& PKCS7_NOVERIFY
))
277 for (k
= 0; k
< sk_X509_num(signers
); k
++) {
278 signer
= sk_X509_value(signers
, k
);
279 if (!(flags
& PKCS7_NOCHAIN
)) {
280 if (!X509_STORE_CTX_init(cert_ctx
, store
, signer
,
282 PKCS7err(0, ERR_R_X509_LIB
);
285 X509_STORE_CTX_set_default(cert_ctx
, "smime_sign");
286 } else if (!X509_STORE_CTX_init(cert_ctx
, store
, signer
, NULL
)) {
287 PKCS7err(0, ERR_R_X509_LIB
);
290 if (!(flags
& PKCS7_NOCRL
))
291 X509_STORE_CTX_set0_crls(cert_ctx
, p7
->d
.sign
->crl
);
292 i
= X509_verify_cert(cert_ctx
);
294 j
= X509_STORE_CTX_get_error(cert_ctx
);
295 X509_STORE_CTX_cleanup(cert_ctx
);
297 PKCS7err(0, PKCS7_R_CERTIFICATE_VERIFY_ERROR
);
298 ERR_add_error_data(2, "Verify error:",
299 X509_verify_cert_error_string(j
));
302 /* Check for revocation status here */
306 * Performance optimization: if the content is a memory BIO then store
307 * its contents in a temporary read only memory BIO. This avoids
308 * potentially large numbers of slow copies of data which will occur when
309 * reading from a read write memory BIO when signatures are calculated.
312 if (indata
&& (BIO_method_type(indata
) == BIO_TYPE_MEM
)) {
315 len
= BIO_get_mem_data(indata
, &ptr
);
316 tmpin
= BIO_new_mem_buf(ptr
, len
);
318 PKCS7err(0, ERR_R_MALLOC_FAILURE
);
324 if ((p7bio
= PKCS7_dataInit(p7
, tmpin
)) == NULL
)
327 if (flags
& PKCS7_TEXT
) {
328 if ((tmpout
= BIO_new(BIO_s_mem())) == NULL
) {
329 PKCS7err(0, ERR_R_MALLOC_FAILURE
);
332 BIO_set_mem_eof_return(tmpout
, 0);
336 /* We now have to 'read' from p7bio to calculate digests etc. */
337 if ((buf
= OPENSSL_malloc(BUFFERSIZE
)) == NULL
) {
338 PKCS7err(0, ERR_R_MALLOC_FAILURE
);
342 i
= BIO_read(p7bio
, buf
, BUFFERSIZE
);
346 BIO_write(tmpout
, buf
, i
);
349 if (flags
& PKCS7_TEXT
) {
350 if (!SMIME_text(tmpout
, out
)) {
351 PKCS7err(0, PKCS7_R_SMIME_TEXT_ERROR
);
358 /* Now Verify All Signatures */
359 if (!(flags
& PKCS7_NOSIGS
))
360 for (i
= 0; i
< sk_PKCS7_SIGNER_INFO_num(sinfos
); i
++) {
361 si
= sk_PKCS7_SIGNER_INFO_value(sinfos
, i
);
362 signer
= sk_X509_value(signers
, i
);
363 j
= PKCS7_signatureVerify(p7bio
, p7
, si
, signer
);
365 PKCS7err(0, PKCS7_R_SIGNATURE_FAILURE
);
373 X509_STORE_CTX_free(cert_ctx
);
375 if (tmpin
== indata
) {
380 sk_X509_free(signers
);
384 STACK_OF(X509
) *PKCS7_get0_signers(PKCS7
*p7
, STACK_OF(X509
) *certs
,
387 STACK_OF(X509
) *signers
;
388 STACK_OF(PKCS7_SIGNER_INFO
) *sinfos
;
389 PKCS7_SIGNER_INFO
*si
;
390 PKCS7_ISSUER_AND_SERIAL
*ias
;
395 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS
, PKCS7_R_INVALID_NULL_POINTER
);
399 if (!PKCS7_type_is_signed(p7
)) {
400 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS
, PKCS7_R_WRONG_CONTENT_TYPE
);
404 /* Collect all the signers together */
406 sinfos
= PKCS7_get_signer_info(p7
);
408 if (sk_PKCS7_SIGNER_INFO_num(sinfos
) <= 0) {
409 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS
, PKCS7_R_NO_SIGNERS
);
413 if ((signers
= sk_X509_new_null()) == NULL
) {
414 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS
, ERR_R_MALLOC_FAILURE
);
418 for (i
= 0; i
< sk_PKCS7_SIGNER_INFO_num(sinfos
); i
++) {
419 si
= sk_PKCS7_SIGNER_INFO_value(sinfos
, i
);
420 ias
= si
->issuer_and_serial
;
422 /* If any certificates passed they take priority */
424 signer
= X509_find_by_issuer_and_serial(certs
,
425 ias
->issuer
, ias
->serial
);
426 if (!signer
&& !(flags
& PKCS7_NOINTERN
)
429 X509_find_by_issuer_and_serial(p7
->d
.sign
->cert
,
430 ias
->issuer
, ias
->serial
);
432 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS
,
433 PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND
);
434 sk_X509_free(signers
);
438 if (!sk_X509_push(signers
, signer
)) {
439 sk_X509_free(signers
);
446 /* Build a complete PKCS#7 enveloped data */
448 PKCS7
*PKCS7_encrypt_with_libctx(STACK_OF(X509
) *certs
, BIO
*in
,
449 const EVP_CIPHER
*cipher
, int flags
,
450 OPENSSL_CTX
*libctx
, const char *propq
)
457 if ((p7
= PKCS7_new_with_libctx(libctx
, propq
)) == NULL
) {
458 PKCS7err(0, ERR_R_MALLOC_FAILURE
);
462 if (!PKCS7_set_type(p7
, NID_pkcs7_enveloped
))
464 if (!PKCS7_set_cipher(p7
, cipher
)) {
465 PKCS7err(0, PKCS7_R_ERROR_SETTING_CIPHER
);
469 for (i
= 0; i
< sk_X509_num(certs
); i
++) {
470 x509
= sk_X509_value(certs
, i
);
471 if (!PKCS7_add_recipient(p7
, x509
)) {
472 PKCS7err(0, PKCS7_R_ERROR_ADDING_RECIPIENT
);
477 if (flags
& PKCS7_STREAM
)
480 if (PKCS7_final(p7
, in
, flags
))
491 PKCS7
*PKCS7_encrypt(STACK_OF(X509
) *certs
, BIO
*in
, const EVP_CIPHER
*cipher
,
494 return PKCS7_encrypt_with_libctx(certs
, in
, cipher
, flags
, NULL
, NULL
);
498 int PKCS7_decrypt(PKCS7
*p7
, EVP_PKEY
*pkey
, X509
*cert
, BIO
*data
, int flags
)
505 PKCS7err(PKCS7_F_PKCS7_DECRYPT
, PKCS7_R_INVALID_NULL_POINTER
);
509 if (!PKCS7_type_is_enveloped(p7
)) {
510 PKCS7err(PKCS7_F_PKCS7_DECRYPT
, PKCS7_R_WRONG_CONTENT_TYPE
);
514 if (cert
&& !X509_check_private_key(cert
, pkey
)) {
515 PKCS7err(PKCS7_F_PKCS7_DECRYPT
,
516 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE
);
520 if ((tmpmem
= PKCS7_dataDecode(p7
, pkey
, NULL
, cert
)) == NULL
) {
521 PKCS7err(PKCS7_F_PKCS7_DECRYPT
, PKCS7_R_DECRYPT_ERROR
);
525 if (flags
& PKCS7_TEXT
) {
527 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
528 if ((tmpbuf
= BIO_new(BIO_f_buffer())) == NULL
) {
529 PKCS7err(PKCS7_F_PKCS7_DECRYPT
, ERR_R_MALLOC_FAILURE
);
530 BIO_free_all(tmpmem
);
533 if ((bread
= BIO_push(tmpbuf
, tmpmem
)) == NULL
) {
534 PKCS7err(PKCS7_F_PKCS7_DECRYPT
, ERR_R_MALLOC_FAILURE
);
535 BIO_free_all(tmpbuf
);
536 BIO_free_all(tmpmem
);
539 ret
= SMIME_text(bread
, data
);
540 if (ret
> 0 && BIO_method_type(tmpmem
) == BIO_TYPE_CIPHER
) {
541 if (!BIO_get_cipher_status(tmpmem
))
547 if ((buf
= OPENSSL_malloc(BUFFERSIZE
)) == NULL
) {
548 PKCS7err(PKCS7_F_PKCS7_DECRYPT
, ERR_R_MALLOC_FAILURE
);
552 i
= BIO_read(tmpmem
, buf
, BUFFERSIZE
);
555 if (BIO_method_type(tmpmem
) == BIO_TYPE_CIPHER
) {
556 if (!BIO_get_cipher_status(tmpmem
))
562 if (BIO_write(data
, buf
, i
) != i
) {
568 BIO_free_all(tmpmem
);