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
21 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
23 PKCS7 *PKCS7_sign_ex(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
24 BIO *data, int flags, OSSL_LIB_CTX *libctx,
30 if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
31 PKCS7err(0, ERR_R_MALLOC_FAILURE);
35 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
38 if (!PKCS7_content_new(p7, NID_pkcs7_data))
41 if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
42 PKCS7err(0, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
46 if (!(flags & PKCS7_NOCERTS)) {
47 for (i = 0; i < sk_X509_num(certs); i++) {
48 if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
53 if (flags & PKCS7_DETACHED)
54 PKCS7_set_detached(p7, 1);
56 if (flags & (PKCS7_STREAM | PKCS7_PARTIAL))
59 if (PKCS7_final(p7, data, flags))
67 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
70 return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
74 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
79 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
80 PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
84 SMIME_crlf_copy(data, p7bio, flags);
86 (void)BIO_flush(p7bio);
88 if (!PKCS7_dataFinal(p7, p7bio)) {
89 PKCS7err(PKCS7_F_PKCS7_FINAL, PKCS7_R_PKCS7_DATASIGN);
100 /* Check to see if a cipher exists and if so add S/MIME capabilities */
102 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
104 if (EVP_get_cipherbynid(nid))
105 return PKCS7_simple_smimecap(sk, nid, arg);
109 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
111 if (EVP_get_digestbynid(nid))
112 return PKCS7_simple_smimecap(sk, nid, arg);
116 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
117 EVP_PKEY *pkey, const EVP_MD *md,
120 PKCS7_SIGNER_INFO *si = NULL;
121 STACK_OF(X509_ALGOR) *smcap = NULL;
123 if (!X509_check_private_key(signcert, pkey)) {
124 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
125 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
129 if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
130 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
131 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
135 si->ctx = pkcs7_get0_ctx(p7);
136 if (!(flags & PKCS7_NOCERTS)) {
137 if (!PKCS7_add_certificate(p7, signcert))
141 if (!(flags & PKCS7_NOATTR)) {
142 if (!PKCS7_add_attrib_content_type(si, NULL))
144 /* Add SMIMECapabilities */
145 if (!(flags & PKCS7_NOSMIMECAP)) {
146 if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
147 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
150 if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
151 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
152 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
153 || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
154 || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
155 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
156 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
157 || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
158 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
159 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
160 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
161 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
162 || !PKCS7_add_attrib_smimecap(si, smcap))
164 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
167 if (flags & PKCS7_REUSE_DIGEST) {
168 if (!pkcs7_copy_existing_digest(p7, si))
170 if (!(flags & PKCS7_PARTIAL)
171 && !PKCS7_SIGNER_INFO_sign(si))
177 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
182 * Search for a digest matching SignerInfo digest type and if found copy
186 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
189 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
190 PKCS7_SIGNER_INFO *sitmp;
191 ASN1_OCTET_STRING *osdig = NULL;
192 sinfos = PKCS7_get_signer_info(p7);
193 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
194 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
197 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
199 if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
200 osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
207 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
209 PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
210 PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
214 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
215 BIO *indata, BIO *out, int flags)
217 STACK_OF(X509) *signers;
219 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
220 PKCS7_SIGNER_INFO *si;
221 X509_STORE_CTX *cert_ctx = NULL;
223 int i, j = 0, k, ret = 0;
225 BIO *tmpin = NULL, *tmpout = NULL;
226 const PKCS7_CTX *p7_ctx;
229 PKCS7err(0, PKCS7_R_INVALID_NULL_POINTER);
233 if (!PKCS7_type_is_signed(p7)) {
234 PKCS7err(0, PKCS7_R_WRONG_CONTENT_TYPE);
238 /* Check for no data and no content: no data to verify signature */
239 if (PKCS7_get_detached(p7) && !indata) {
240 PKCS7err(0, PKCS7_R_NO_CONTENT);
244 if (flags & PKCS7_NO_DUAL_CONTENT) {
246 * This was originally "#if 0" because we thought that only old broken
247 * Netscape did this. It turns out that Authenticode uses this kind
248 * of "extended" PKCS7 format, and things like UEFI secure boot and
249 * tools like osslsigncode need it. In Authenticode the verification
250 * process is different, but the existing PKCs7 verification works.
252 if (!PKCS7_get_detached(p7) && indata) {
253 PKCS7err(0, PKCS7_R_CONTENT_AND_DATA_PRESENT);
258 sinfos = PKCS7_get_signer_info(p7);
260 if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
261 PKCS7err(0, PKCS7_R_NO_SIGNATURES_ON_DATA);
265 signers = PKCS7_get0_signers(p7, certs, flags);
269 /* Now verify the certificates */
270 p7_ctx = pkcs7_get0_ctx(p7);
271 cert_ctx = X509_STORE_CTX_new_ex(p7_ctx->libctx, p7_ctx->propq);
272 if (cert_ctx == NULL)
274 if (!(flags & PKCS7_NOVERIFY))
275 for (k = 0; k < sk_X509_num(signers); k++) {
276 signer = sk_X509_value(signers, k);
277 if (!(flags & PKCS7_NOCHAIN)) {
278 if (!X509_STORE_CTX_init(cert_ctx, store, signer,
280 PKCS7err(0, ERR_R_X509_LIB);
283 X509_STORE_CTX_set_default(cert_ctx, "smime_sign");
284 } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
285 PKCS7err(0, ERR_R_X509_LIB);
288 if (!(flags & PKCS7_NOCRL))
289 X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
290 i = X509_verify_cert(cert_ctx);
292 j = X509_STORE_CTX_get_error(cert_ctx);
293 X509_STORE_CTX_cleanup(cert_ctx);
295 PKCS7err(0, PKCS7_R_CERTIFICATE_VERIFY_ERROR);
296 ERR_add_error_data(2, "Verify error:",
297 X509_verify_cert_error_string(j));
300 /* Check for revocation status here */
304 * Performance optimization: if the content is a memory BIO then store
305 * its contents in a temporary read only memory BIO. This avoids
306 * potentially large numbers of slow copies of data which will occur when
307 * reading from a read write memory BIO when signatures are calculated.
310 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
313 len = BIO_get_mem_data(indata, &ptr);
314 tmpin = (len == 0) ? indata : BIO_new_mem_buf(ptr, len);
316 PKCS7err(0, ERR_R_MALLOC_FAILURE);
322 if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL)
325 if (flags & PKCS7_TEXT) {
326 if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
327 PKCS7err(0, ERR_R_MALLOC_FAILURE);
330 BIO_set_mem_eof_return(tmpout, 0);
334 /* We now have to 'read' from p7bio to calculate digests etc. */
335 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
336 PKCS7err(0, ERR_R_MALLOC_FAILURE);
340 i = BIO_read(p7bio, buf, BUFFERSIZE);
344 BIO_write(tmpout, buf, i);
347 if (flags & PKCS7_TEXT) {
348 if (!SMIME_text(tmpout, out)) {
349 PKCS7err(0, PKCS7_R_SMIME_TEXT_ERROR);
356 /* Now Verify All Signatures */
357 if (!(flags & PKCS7_NOSIGS))
358 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
359 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
360 signer = sk_X509_value(signers, i);
361 j = PKCS7_signatureVerify(p7bio, p7, si, signer);
363 PKCS7err(0, PKCS7_R_SIGNATURE_FAILURE);
371 X509_STORE_CTX_free(cert_ctx);
373 if (tmpin == indata) {
378 sk_X509_free(signers);
382 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
385 STACK_OF(X509) *signers;
386 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
387 PKCS7_SIGNER_INFO *si;
388 PKCS7_ISSUER_AND_SERIAL *ias;
393 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
397 if (!PKCS7_type_is_signed(p7)) {
398 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_WRONG_CONTENT_TYPE);
402 /* Collect all the signers together */
404 sinfos = PKCS7_get_signer_info(p7);
406 if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
407 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
411 if ((signers = sk_X509_new_null()) == NULL) {
412 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
416 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
417 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
418 ias = si->issuer_and_serial;
420 /* If any certificates passed they take priority */
422 signer = X509_find_by_issuer_and_serial(certs,
423 ias->issuer, ias->serial);
424 if (!signer && !(flags & PKCS7_NOINTERN)
427 X509_find_by_issuer_and_serial(p7->d.sign->cert,
428 ias->issuer, ias->serial);
430 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
431 PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
432 sk_X509_free(signers);
436 if (!sk_X509_push(signers, signer)) {
437 sk_X509_free(signers);
444 /* Build a complete PKCS#7 enveloped data */
446 PKCS7 *PKCS7_encrypt_ex(STACK_OF(X509) *certs, BIO *in,
447 const EVP_CIPHER *cipher, int flags,
448 OSSL_LIB_CTX *libctx, const char *propq)
455 if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
456 PKCS7err(0, ERR_R_MALLOC_FAILURE);
460 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
462 if (!PKCS7_set_cipher(p7, cipher)) {
463 PKCS7err(0, PKCS7_R_ERROR_SETTING_CIPHER);
467 for (i = 0; i < sk_X509_num(certs); i++) {
468 x509 = sk_X509_value(certs, i);
469 if (!PKCS7_add_recipient(p7, x509)) {
470 PKCS7err(0, PKCS7_R_ERROR_ADDING_RECIPIENT);
475 if (flags & PKCS7_STREAM)
478 if (PKCS7_final(p7, in, flags))
489 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
492 return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL);
496 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
503 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
507 if (!PKCS7_type_is_enveloped(p7)) {
508 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
512 if (cert && !X509_check_private_key(cert, pkey)) {
513 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
514 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
518 if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
519 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
523 if (flags & PKCS7_TEXT) {
525 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
526 if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
527 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
528 BIO_free_all(tmpmem);
531 if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
532 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
533 BIO_free_all(tmpbuf);
534 BIO_free_all(tmpmem);
537 ret = SMIME_text(bread, data);
538 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
539 if (!BIO_get_cipher_status(tmpmem))
545 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
546 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
550 i = BIO_read(tmpmem, buf, BUFFERSIZE);
553 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
554 if (!BIO_get_cipher_status(tmpmem))
560 if (BIO_write(data, buf, i) != i) {
566 BIO_free_all(tmpmem);