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- /*
- * Copyright 1999-2016 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>
- #define BUFFERSIZE 4096
- static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
- PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
- BIO *data, int flags)
- {
- PKCS7 *p7;
- int i;
- if ((p7 = PKCS7_new()) == NULL) {
- PKCS7err(PKCS7_F_PKCS7_SIGN, 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)) {
- PKCS7err(PKCS7_F_PKCS7_SIGN, 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;
- }
- int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
- {
- BIO *p7bio;
- int ret = 0;
- if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
- PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- SMIME_crlf_copy(data, p7bio, flags);
- (void)BIO_flush(p7bio);
- if (!PKCS7_dataFinal(p7, p7bio)) {
- PKCS7err(PKCS7_F_PKCS7_FINAL, 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)) {
- PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
- PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
- return NULL;
- }
- if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
- PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
- PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
- return NULL;
- }
- 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) {
- PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, 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)
- return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
- PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
- 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;
- if (p7 == NULL) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
- return 0;
- }
- if (!PKCS7_type_is_signed(p7)) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
- return 0;
- }
- }
- sinfos = PKCS7_get_signer_info(p7);
- if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_SIGNATURES_ON_DATA);
- return 0;
- }
- signers = PKCS7_get0_signers(p7, certs, flags);
- if (!signers)
- return 0;
- /* Now verify the certificates */
- cert_ctx = X509_STORE_CTX_new();
- 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)) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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)) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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);
- X509_STORE_CTX_cleanup(cert_ctx);
- if (i <= 0) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY,
- PKCS7_R_CERTIFICATE_VERIFY_ERROR);
- ERR_add_error_data(2, "Verify error:",
- 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 = BIO_new_mem_buf(ptr, len);
- if (tmpin == NULL) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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)) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
- PKCS7err(PKCS7_F_PKCS7_VERIFY, 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) {
- PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
- return NULL;
- }
- if (!PKCS7_type_is_signed(p7)) {
- PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, 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) {
- PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
- return 0;
- }
- if ((signers = sk_X509_new_null()) == NULL) {
- PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, 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) {
- PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
- 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(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
- int flags)
- {
- PKCS7 *p7;
- BIO *p7bio = NULL;
- int i;
- X509 *x509;
- if ((p7 = PKCS7_new()) == NULL) {
- PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
- return NULL;
- }
- if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
- goto err;
- if (!PKCS7_set_cipher(p7, cipher)) {
- PKCS7err(PKCS7_F_PKCS7_ENCRYPT, 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)) {
- PKCS7err(PKCS7_F_PKCS7_ENCRYPT, 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;
- }
- 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) {
- PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
- return 0;
- }
- if (!PKCS7_type_is_enveloped(p7)) {
- PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
- return 0;
- }
- if (cert && !X509_check_private_key(cert, pkey)) {
- PKCS7err(PKCS7_F_PKCS7_DECRYPT,
- PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
- return 0;
- }
- if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
- PKCS7err(PKCS7_F_PKCS7_DECRYPT, 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) {
- PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
- BIO_free_all(tmpmem);
- return 0;
- }
- if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
- PKCS7err(PKCS7_F_PKCS7_DECRYPT, 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) {
- PKCS7err(PKCS7_F_PKCS7_DECRYPT, 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;
- }
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