| /* |
| * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /* Simple PKCS#7 processing functions */ |
| |
| #include <stdio.h> |
| #include "internal/cryptlib.h" |
| #include <openssl/x509.h> |
| #include <openssl/x509v3.h> |
| #include "pk7_local.h" |
| |
| #define BUFFERSIZE 4096 |
| |
| |
| static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si); |
| |
| PKCS7 *PKCS7_sign_ex(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, |
| BIO *data, int flags, OSSL_LIB_CTX *libctx, |
| const char *propq) |
| { |
| PKCS7 *p7; |
| int i; |
| |
| if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| |
| if (!PKCS7_set_type(p7, NID_pkcs7_signed)) |
| goto err; |
| |
| if (!PKCS7_content_new(p7, NID_pkcs7_data)) |
| goto err; |
| |
| if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNER_ERROR); |
| goto err; |
| } |
| |
| if (!(flags & PKCS7_NOCERTS)) { |
| for (i = 0; i < sk_X509_num(certs); i++) { |
| if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i))) |
| goto err; |
| } |
| } |
| |
| if (flags & PKCS7_DETACHED) |
| PKCS7_set_detached(p7, 1); |
| |
| if (flags & (PKCS7_STREAM | PKCS7_PARTIAL)) |
| return p7; |
| |
| if (PKCS7_final(p7, data, flags)) |
| return p7; |
| |
| err: |
| PKCS7_free(p7); |
| return NULL; |
| } |
| |
| PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, |
| BIO *data, int flags) |
| { |
| return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL); |
| } |
| |
| |
| int PKCS7_final(PKCS7 *p7, BIO *data, int flags) |
| { |
| BIO *p7bio; |
| int ret = 0; |
| |
| if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| |
| SMIME_crlf_copy(data, p7bio, flags); |
| |
| (void)BIO_flush(p7bio); |
| |
| if (!PKCS7_dataFinal(p7, p7bio)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_DATASIGN); |
| goto err; |
| } |
| ret = 1; |
| err: |
| BIO_free_all(p7bio); |
| |
| return ret; |
| |
| } |
| |
| /* Check to see if a cipher exists and if so add S/MIME capabilities */ |
| |
| static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) |
| { |
| if (EVP_get_cipherbynid(nid)) |
| return PKCS7_simple_smimecap(sk, nid, arg); |
| return 1; |
| } |
| |
| static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) |
| { |
| if (EVP_get_digestbynid(nid)) |
| return PKCS7_simple_smimecap(sk, nid, arg); |
| return 1; |
| } |
| |
| PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, |
| EVP_PKEY *pkey, const EVP_MD *md, |
| int flags) |
| { |
| PKCS7_SIGNER_INFO *si = NULL; |
| STACK_OF(X509_ALGOR) *smcap = NULL; |
| |
| if (!X509_check_private_key(signcert, pkey)) { |
| ERR_raise(ERR_LIB_PKCS7, |
| PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); |
| return NULL; |
| } |
| |
| if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR); |
| return NULL; |
| } |
| |
| si->ctx = ossl_pkcs7_get0_ctx(p7); |
| if (!(flags & PKCS7_NOCERTS)) { |
| if (!PKCS7_add_certificate(p7, signcert)) |
| goto err; |
| } |
| |
| if (!(flags & PKCS7_NOATTR)) { |
| if (!PKCS7_add_attrib_content_type(si, NULL)) |
| goto err; |
| /* Add SMIMECapabilities */ |
| if (!(flags & PKCS7_NOSMIMECAP)) { |
| if ((smcap = sk_X509_ALGOR_new_null()) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1) |
| || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1) |
| || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1) |
| || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1) |
| || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1) |
| || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1) |
| || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1) |
| || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) |
| || !add_cipher_smcap(smcap, NID_rc2_cbc, 128) |
| || !add_cipher_smcap(smcap, NID_rc2_cbc, 64) |
| || !add_cipher_smcap(smcap, NID_des_cbc, -1) |
| || !add_cipher_smcap(smcap, NID_rc2_cbc, 40) |
| || !PKCS7_add_attrib_smimecap(si, smcap)) |
| goto err; |
| sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); |
| smcap = NULL; |
| } |
| if (flags & PKCS7_REUSE_DIGEST) { |
| if (!pkcs7_copy_existing_digest(p7, si)) |
| goto err; |
| if (!(flags & PKCS7_PARTIAL) |
| && !PKCS7_SIGNER_INFO_sign(si)) |
| goto err; |
| } |
| } |
| return si; |
| err: |
| sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); |
| return NULL; |
| } |
| |
| /* |
| * Search for a digest matching SignerInfo digest type and if found copy |
| * across. |
| */ |
| |
| static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si) |
| { |
| int i; |
| STACK_OF(PKCS7_SIGNER_INFO) *sinfos; |
| PKCS7_SIGNER_INFO *sitmp; |
| ASN1_OCTET_STRING *osdig = NULL; |
| sinfos = PKCS7_get_signer_info(p7); |
| for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) { |
| sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i); |
| if (si == sitmp) |
| break; |
| if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0) |
| continue; |
| if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) { |
| osdig = PKCS7_digest_from_attributes(sitmp->auth_attr); |
| break; |
| } |
| |
| } |
| |
| if (osdig != NULL) |
| return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length); |
| |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND); |
| return 0; |
| } |
| |
| int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, |
| BIO *indata, BIO *out, int flags) |
| { |
| STACK_OF(X509) *signers; |
| X509 *signer; |
| STACK_OF(PKCS7_SIGNER_INFO) *sinfos; |
| PKCS7_SIGNER_INFO *si; |
| X509_STORE_CTX *cert_ctx = NULL; |
| char *buf = NULL; |
| int i, j = 0, k, ret = 0; |
| BIO *p7bio = NULL; |
| BIO *tmpin = NULL, *tmpout = NULL; |
| const PKCS7_CTX *p7_ctx; |
| |
| if (p7 == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER); |
| return 0; |
| } |
| |
| if (!PKCS7_type_is_signed(p7)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE); |
| return 0; |
| } |
| |
| /* Check for no data and no content: no data to verify signature */ |
| if (PKCS7_get_detached(p7) && !indata) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT); |
| return 0; |
| } |
| |
| if (flags & PKCS7_NO_DUAL_CONTENT) { |
| /* |
| * This was originally "#if 0" because we thought that only old broken |
| * Netscape did this. It turns out that Authenticode uses this kind |
| * of "extended" PKCS7 format, and things like UEFI secure boot and |
| * tools like osslsigncode need it. In Authenticode the verification |
| * process is different, but the existing PKCs7 verification works. |
| */ |
| if (!PKCS7_get_detached(p7) && indata) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CONTENT_AND_DATA_PRESENT); |
| return 0; |
| } |
| } |
| |
| sinfos = PKCS7_get_signer_info(p7); |
| |
| if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNATURES_ON_DATA); |
| return 0; |
| } |
| |
| signers = PKCS7_get0_signers(p7, certs, flags); |
| if (signers == NULL) |
| return 0; |
| |
| /* Now verify the certificates */ |
| p7_ctx = ossl_pkcs7_get0_ctx(p7); |
| cert_ctx = X509_STORE_CTX_new_ex(ossl_pkcs7_ctx_get0_libctx(p7_ctx), |
| ossl_pkcs7_ctx_get0_propq(p7_ctx)); |
| if (cert_ctx == NULL) |
| goto err; |
| if (!(flags & PKCS7_NOVERIFY)) |
| for (k = 0; k < sk_X509_num(signers); k++) { |
| signer = sk_X509_value(signers, k); |
| if (!(flags & PKCS7_NOCHAIN)) { |
| if (!X509_STORE_CTX_init(cert_ctx, store, signer, |
| p7->d.sign->cert)) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB); |
| goto err; |
| } |
| X509_STORE_CTX_set_default(cert_ctx, "smime_sign"); |
| } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB); |
| goto err; |
| } |
| if (!(flags & PKCS7_NOCRL)) |
| X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl); |
| i = X509_verify_cert(cert_ctx); |
| if (i <= 0) |
| j = X509_STORE_CTX_get_error(cert_ctx); |
| if (i <= 0) { |
| ERR_raise_data(ERR_LIB_PKCS7, PKCS7_R_CERTIFICATE_VERIFY_ERROR, |
| "Verify error: %s", |
| X509_verify_cert_error_string(j)); |
| goto err; |
| } |
| /* Check for revocation status here */ |
| } |
| |
| /* |
| * Performance optimization: if the content is a memory BIO then store |
| * its contents in a temporary read only memory BIO. This avoids |
| * potentially large numbers of slow copies of data which will occur when |
| * reading from a read write memory BIO when signatures are calculated. |
| */ |
| |
| if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) { |
| char *ptr; |
| long len; |
| len = BIO_get_mem_data(indata, &ptr); |
| tmpin = (len == 0) ? indata : BIO_new_mem_buf(ptr, len); |
| if (tmpin == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| } else |
| tmpin = indata; |
| |
| if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL) |
| goto err; |
| |
| if (flags & PKCS7_TEXT) { |
| if ((tmpout = BIO_new(BIO_s_mem())) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| BIO_set_mem_eof_return(tmpout, 0); |
| } else |
| tmpout = out; |
| |
| /* We now have to 'read' from p7bio to calculate digests etc. */ |
| if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| for (;;) { |
| i = BIO_read(p7bio, buf, BUFFERSIZE); |
| if (i <= 0) |
| break; |
| if (tmpout) |
| BIO_write(tmpout, buf, i); |
| } |
| |
| if (flags & PKCS7_TEXT) { |
| if (!SMIME_text(tmpout, out)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SMIME_TEXT_ERROR); |
| BIO_free(tmpout); |
| goto err; |
| } |
| BIO_free(tmpout); |
| } |
| |
| /* Now Verify All Signatures */ |
| if (!(flags & PKCS7_NOSIGS)) |
| for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) { |
| si = sk_PKCS7_SIGNER_INFO_value(sinfos, i); |
| signer = sk_X509_value(signers, i); |
| j = PKCS7_signatureVerify(p7bio, p7, si, signer); |
| if (j <= 0) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE); |
| goto err; |
| } |
| } |
| |
| ret = 1; |
| |
| err: |
| X509_STORE_CTX_free(cert_ctx); |
| OPENSSL_free(buf); |
| if (tmpin == indata) { |
| if (indata) |
| BIO_pop(p7bio); |
| } |
| BIO_free_all(p7bio); |
| sk_X509_free(signers); |
| return ret; |
| } |
| |
| STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, |
| int flags) |
| { |
| STACK_OF(X509) *signers; |
| STACK_OF(PKCS7_SIGNER_INFO) *sinfos; |
| PKCS7_SIGNER_INFO *si; |
| PKCS7_ISSUER_AND_SERIAL *ias; |
| X509 *signer; |
| int i; |
| |
| if (p7 == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER); |
| return NULL; |
| } |
| |
| if (!PKCS7_type_is_signed(p7)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE); |
| return NULL; |
| } |
| |
| /* Collect all the signers together */ |
| |
| sinfos = PKCS7_get_signer_info(p7); |
| |
| if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNERS); |
| return 0; |
| } |
| |
| if ((signers = sk_X509_new_null()) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| |
| for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) { |
| si = sk_PKCS7_SIGNER_INFO_value(sinfos, i); |
| ias = si->issuer_and_serial; |
| signer = NULL; |
| /* If any certificates passed they take priority */ |
| if (certs) |
| signer = X509_find_by_issuer_and_serial(certs, |
| ias->issuer, ias->serial); |
| if (!signer && !(flags & PKCS7_NOINTERN) |
| && p7->d.sign->cert) |
| signer = |
| X509_find_by_issuer_and_serial(p7->d.sign->cert, |
| ias->issuer, ias->serial); |
| if (!signer) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND); |
| sk_X509_free(signers); |
| return 0; |
| } |
| |
| if (!sk_X509_push(signers, signer)) { |
| sk_X509_free(signers); |
| return NULL; |
| } |
| } |
| return signers; |
| } |
| |
| /* Build a complete PKCS#7 enveloped data */ |
| |
| PKCS7 *PKCS7_encrypt_ex(STACK_OF(X509) *certs, BIO *in, |
| const EVP_CIPHER *cipher, int flags, |
| OSSL_LIB_CTX *libctx, const char *propq) |
| { |
| PKCS7 *p7; |
| BIO *p7bio = NULL; |
| int i; |
| X509 *x509; |
| |
| if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| |
| if (!PKCS7_set_type(p7, NID_pkcs7_enveloped)) |
| goto err; |
| if (!PKCS7_set_cipher(p7, cipher)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_SETTING_CIPHER); |
| goto err; |
| } |
| |
| for (i = 0; i < sk_X509_num(certs); i++) { |
| x509 = sk_X509_value(certs, i); |
| if (!PKCS7_add_recipient(p7, x509)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_ADDING_RECIPIENT); |
| goto err; |
| } |
| } |
| |
| if (flags & PKCS7_STREAM) |
| return p7; |
| |
| if (PKCS7_final(p7, in, flags)) |
| return p7; |
| |
| err: |
| |
| BIO_free_all(p7bio); |
| PKCS7_free(p7); |
| return NULL; |
| |
| } |
| |
| PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, |
| int flags) |
| { |
| return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL); |
| } |
| |
| |
| int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags) |
| { |
| BIO *tmpmem; |
| int ret = 0, i; |
| char *buf = NULL; |
| |
| if (p7 == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER); |
| return 0; |
| } |
| |
| if (!PKCS7_type_is_enveloped(p7)) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE); |
| return 0; |
| } |
| |
| if (cert && !X509_check_private_key(cert, pkey)) { |
| ERR_raise(ERR_LIB_PKCS7, |
| PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); |
| return 0; |
| } |
| |
| if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DECRYPT_ERROR); |
| return 0; |
| } |
| |
| if (flags & PKCS7_TEXT) { |
| BIO *tmpbuf, *bread; |
| /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */ |
| if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| BIO_free_all(tmpmem); |
| return 0; |
| } |
| if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| BIO_free_all(tmpbuf); |
| BIO_free_all(tmpmem); |
| return 0; |
| } |
| ret = SMIME_text(bread, data); |
| if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) { |
| if (!BIO_get_cipher_status(tmpmem)) |
| ret = 0; |
| } |
| BIO_free_all(bread); |
| return ret; |
| } |
| if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) { |
| ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| for (;;) { |
| i = BIO_read(tmpmem, buf, BUFFERSIZE); |
| if (i <= 0) { |
| ret = 1; |
| if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) { |
| if (!BIO_get_cipher_status(tmpmem)) |
| ret = 0; |
| } |
| |
| break; |
| } |
| if (BIO_write(data, buf, i) != i) { |
| break; |
| } |
| } |
| err: |
| OPENSSL_free(buf); |
| BIO_free_all(tmpmem); |
| return ret; |
| } |
