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1184 lines
34 KiB
C
1184 lines
34 KiB
C
/*
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* Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/rand.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/err.h>
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static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
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void *value);
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static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
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static int PKCS7_type_is_other(PKCS7 *p7)
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{
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int isOther = 1;
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int nid = OBJ_obj2nid(p7->type);
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switch (nid) {
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case NID_pkcs7_data:
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case NID_pkcs7_signed:
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case NID_pkcs7_enveloped:
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case NID_pkcs7_signedAndEnveloped:
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case NID_pkcs7_digest:
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case NID_pkcs7_encrypted:
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isOther = 0;
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break;
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default:
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isOther = 1;
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}
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return isOther;
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}
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static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
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{
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if (PKCS7_type_is_data(p7))
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return p7->d.data;
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if (PKCS7_type_is_other(p7) && p7->d.other
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&& (p7->d.other->type == V_ASN1_OCTET_STRING))
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return p7->d.other->value.octet_string;
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return NULL;
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}
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static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
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{
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BIO *btmp;
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const EVP_MD *md;
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if ((btmp = BIO_new(BIO_f_md())) == NULL) {
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PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
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goto err;
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}
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md = EVP_get_digestbyobj(alg->algorithm);
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if (md == NULL) {
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PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
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goto err;
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}
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BIO_set_md(btmp, md);
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if (*pbio == NULL)
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*pbio = btmp;
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else if (!BIO_push(*pbio, btmp)) {
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PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
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goto err;
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}
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btmp = NULL;
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return 1;
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err:
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BIO_free(btmp);
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return 0;
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}
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static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
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unsigned char *key, int keylen)
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{
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EVP_PKEY_CTX *pctx = NULL;
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EVP_PKEY *pkey = NULL;
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unsigned char *ek = NULL;
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int ret = 0;
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size_t eklen;
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pkey = X509_get0_pubkey(ri->cert);
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if (!pkey)
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return 0;
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pctx = EVP_PKEY_CTX_new(pkey, NULL);
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if (!pctx)
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return 0;
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if (EVP_PKEY_encrypt_init(pctx) <= 0)
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goto err;
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if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
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EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
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PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
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goto err;
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}
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if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
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goto err;
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ek = OPENSSL_malloc(eklen);
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if (ek == NULL) {
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PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
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goto err;
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ASN1_STRING_set0(ri->enc_key, ek, eklen);
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ek = NULL;
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ret = 1;
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err:
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EVP_PKEY_CTX_free(pctx);
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OPENSSL_free(ek);
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return ret;
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}
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static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
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PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
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size_t fixlen)
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{
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EVP_PKEY_CTX *pctx = NULL;
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unsigned char *ek = NULL;
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size_t eklen;
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int ret = -1;
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pctx = EVP_PKEY_CTX_new(pkey, NULL);
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if (!pctx)
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return -1;
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if (EVP_PKEY_decrypt_init(pctx) <= 0)
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goto err;
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if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
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EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
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PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
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goto err;
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}
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if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
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ri->enc_key->data, ri->enc_key->length) <= 0)
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goto err;
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ek = OPENSSL_malloc(eklen);
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if (ek == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_PKEY_decrypt(pctx, ek, &eklen,
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ri->enc_key->data, ri->enc_key->length) <= 0
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|| eklen == 0
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|| (fixlen != 0 && eklen != fixlen)) {
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ret = 0;
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PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
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goto err;
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}
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ret = 1;
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OPENSSL_clear_free(*pek, *peklen);
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*pek = ek;
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*peklen = eklen;
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err:
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EVP_PKEY_CTX_free(pctx);
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if (!ret)
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OPENSSL_free(ek);
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return ret;
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}
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BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
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{
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int i;
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BIO *out = NULL, *btmp = NULL;
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X509_ALGOR *xa = NULL;
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const EVP_CIPHER *evp_cipher = NULL;
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STACK_OF(X509_ALGOR) *md_sk = NULL;
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STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
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X509_ALGOR *xalg = NULL;
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PKCS7_RECIP_INFO *ri = NULL;
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ASN1_OCTET_STRING *os = NULL;
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if (p7 == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
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return NULL;
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}
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/*
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* The content field in the PKCS7 ContentInfo is optional, but that really
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* only applies to inner content (precisely, detached signatures).
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*
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* When reading content, missing outer content is therefore treated as an
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* error.
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*
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* When creating content, PKCS7_content_new() must be called before
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* calling this method, so a NULL p7->d is always an error.
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*/
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if (p7->d.ptr == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
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return NULL;
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}
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i = OBJ_obj2nid(p7->type);
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p7->state = PKCS7_S_HEADER;
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switch (i) {
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case NID_pkcs7_signed:
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md_sk = p7->d.sign->md_algs;
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os = PKCS7_get_octet_string(p7->d.sign->contents);
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break;
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case NID_pkcs7_signedAndEnveloped:
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rsk = p7->d.signed_and_enveloped->recipientinfo;
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md_sk = p7->d.signed_and_enveloped->md_algs;
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xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
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evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
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if (evp_cipher == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
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goto err;
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}
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break;
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case NID_pkcs7_enveloped:
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rsk = p7->d.enveloped->recipientinfo;
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xalg = p7->d.enveloped->enc_data->algorithm;
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evp_cipher = p7->d.enveloped->enc_data->cipher;
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if (evp_cipher == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
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goto err;
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}
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break;
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case NID_pkcs7_digest:
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xa = p7->d.digest->md;
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os = PKCS7_get_octet_string(p7->d.digest->contents);
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break;
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case NID_pkcs7_data:
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break;
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default:
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PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
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goto err;
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}
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for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
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if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
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goto err;
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if (xa && !PKCS7_bio_add_digest(&out, xa))
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goto err;
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if (evp_cipher != NULL) {
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unsigned char key[EVP_MAX_KEY_LENGTH];
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unsigned char iv[EVP_MAX_IV_LENGTH];
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int keylen, ivlen;
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EVP_CIPHER_CTX *ctx;
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if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
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goto err;
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}
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BIO_get_cipher_ctx(btmp, &ctx);
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keylen = EVP_CIPHER_key_length(evp_cipher);
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ivlen = EVP_CIPHER_iv_length(evp_cipher);
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xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
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if (ivlen > 0)
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if (RAND_bytes(iv, ivlen) <= 0)
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goto err;
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if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
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goto err;
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if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
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goto err;
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if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
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goto err;
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if (ivlen > 0) {
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if (xalg->parameter == NULL) {
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xalg->parameter = ASN1_TYPE_new();
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if (xalg->parameter == NULL)
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goto err;
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}
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if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
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goto err;
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}
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/* Lets do the pub key stuff :-) */
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for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
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ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
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if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
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goto err;
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}
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OPENSSL_cleanse(key, keylen);
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if (out == NULL)
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out = btmp;
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else
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BIO_push(out, btmp);
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btmp = NULL;
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}
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if (bio == NULL) {
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if (PKCS7_is_detached(p7)) {
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bio = BIO_new(BIO_s_null());
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} else if (os && os->length > 0) {
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bio = BIO_new_mem_buf(os->data, os->length);
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} else {
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bio = BIO_new(BIO_s_mem());
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if (bio == NULL)
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goto err;
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BIO_set_mem_eof_return(bio, 0);
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}
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if (bio == NULL)
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goto err;
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}
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if (out)
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BIO_push(out, bio);
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else
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out = bio;
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return out;
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err:
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BIO_free_all(out);
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BIO_free_all(btmp);
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return NULL;
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}
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static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
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{
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int ret;
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ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
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X509_get_issuer_name(pcert));
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if (ret)
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return ret;
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return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
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ri->issuer_and_serial->serial);
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}
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/* int */
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BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
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{
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int i, j;
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BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
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X509_ALGOR *xa;
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ASN1_OCTET_STRING *data_body = NULL;
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const EVP_MD *evp_md;
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const EVP_CIPHER *evp_cipher = NULL;
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EVP_CIPHER_CTX *evp_ctx = NULL;
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X509_ALGOR *enc_alg = NULL;
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STACK_OF(X509_ALGOR) *md_sk = NULL;
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STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
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PKCS7_RECIP_INFO *ri = NULL;
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unsigned char *ek = NULL, *tkey = NULL;
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int eklen = 0, tkeylen = 0;
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if (p7 == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
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return NULL;
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}
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if (p7->d.ptr == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
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return NULL;
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}
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|
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i = OBJ_obj2nid(p7->type);
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p7->state = PKCS7_S_HEADER;
|
|
|
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switch (i) {
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case NID_pkcs7_signed:
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/*
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* p7->d.sign->contents is a PKCS7 structure consisting of a contentType
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* field and optional content.
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* data_body is NULL if that structure has no (=detached) content
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* or if the contentType is wrong (i.e., not "data").
|
|
*/
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data_body = PKCS7_get_octet_string(p7->d.sign->contents);
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if (!PKCS7_is_detached(p7) && data_body == NULL) {
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PKCS7err(PKCS7_F_PKCS7_DATADECODE,
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PKCS7_R_INVALID_SIGNED_DATA_TYPE);
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goto err;
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}
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md_sk = p7->d.sign->md_algs;
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break;
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case NID_pkcs7_signedAndEnveloped:
|
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rsk = p7->d.signed_and_enveloped->recipientinfo;
|
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md_sk = p7->d.signed_and_enveloped->md_algs;
|
|
/* data_body is NULL if the optional EncryptedContent is missing. */
|
|
data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
|
|
enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
|
|
evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
|
|
if (evp_cipher == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
|
PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
|
|
goto err;
|
|
}
|
|
break;
|
|
case NID_pkcs7_enveloped:
|
|
rsk = p7->d.enveloped->recipientinfo;
|
|
enc_alg = p7->d.enveloped->enc_data->algorithm;
|
|
/* data_body is NULL if the optional EncryptedContent is missing. */
|
|
data_body = p7->d.enveloped->enc_data->enc_data;
|
|
evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
|
|
if (evp_cipher == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
|
PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
|
|
goto err;
|
|
}
|
|
break;
|
|
default:
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
|
|
goto err;
|
|
}
|
|
|
|
/* Detached content must be supplied via in_bio instead. */
|
|
if (data_body == NULL && in_bio == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
|
|
goto err;
|
|
}
|
|
|
|
/* We will be checking the signature */
|
|
if (md_sk != NULL) {
|
|
for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
|
|
xa = sk_X509_ALGOR_value(md_sk, i);
|
|
if ((btmp = BIO_new(BIO_f_md())) == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
|
|
goto err;
|
|
}
|
|
|
|
j = OBJ_obj2nid(xa->algorithm);
|
|
evp_md = EVP_get_digestbynid(j);
|
|
if (evp_md == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
|
PKCS7_R_UNKNOWN_DIGEST_TYPE);
|
|
goto err;
|
|
}
|
|
|
|
BIO_set_md(btmp, evp_md);
|
|
if (out == NULL)
|
|
out = btmp;
|
|
else
|
|
BIO_push(out, btmp);
|
|
btmp = NULL;
|
|
}
|
|
}
|
|
|
|
if (evp_cipher != NULL) {
|
|
if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* It was encrypted, we need to decrypt the secret key with the
|
|
* private key
|
|
*/
|
|
|
|
/*
|
|
* Find the recipientInfo which matches the passed certificate (if
|
|
* any)
|
|
*/
|
|
|
|
if (pcert) {
|
|
for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
|
|
ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
|
|
if (!pkcs7_cmp_ri(ri, pcert))
|
|
break;
|
|
ri = NULL;
|
|
}
|
|
if (ri == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
|
PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
/* If we haven't got a certificate try each ri in turn */
|
|
if (pcert == NULL) {
|
|
/*
|
|
* Always attempt to decrypt all rinfo even after success as a
|
|
* defence against MMA timing attacks.
|
|
*/
|
|
for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
|
|
ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
|
|
|
|
if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
|
|
EVP_CIPHER_key_length(evp_cipher)) < 0)
|
|
goto err;
|
|
ERR_clear_error();
|
|
}
|
|
} else {
|
|
/* Only exit on fatal errors, not decrypt failure */
|
|
if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
|
|
goto err;
|
|
ERR_clear_error();
|
|
}
|
|
|
|
evp_ctx = NULL;
|
|
BIO_get_cipher_ctx(etmp, &evp_ctx);
|
|
if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
|
|
goto err;
|
|
if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
|
|
goto err;
|
|
/* Generate random key as MMA defence */
|
|
tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
|
|
tkey = OPENSSL_malloc(tkeylen);
|
|
if (tkey == NULL)
|
|
goto err;
|
|
if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
|
|
goto err;
|
|
if (ek == NULL) {
|
|
ek = tkey;
|
|
eklen = tkeylen;
|
|
tkey = NULL;
|
|
}
|
|
|
|
if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
|
|
/*
|
|
* Some S/MIME clients don't use the same key and effective key
|
|
* length. The key length is determined by the size of the
|
|
* decrypted RSA key.
|
|
*/
|
|
if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
|
|
/* Use random key as MMA defence */
|
|
OPENSSL_clear_free(ek, eklen);
|
|
ek = tkey;
|
|
eklen = tkeylen;
|
|
tkey = NULL;
|
|
}
|
|
}
|
|
/* Clear errors so we don't leak information useful in MMA */
|
|
ERR_clear_error();
|
|
if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
|
|
goto err;
|
|
|
|
OPENSSL_clear_free(ek, eklen);
|
|
ek = NULL;
|
|
OPENSSL_clear_free(tkey, tkeylen);
|
|
tkey = NULL;
|
|
|
|
if (out == NULL)
|
|
out = etmp;
|
|
else
|
|
BIO_push(out, etmp);
|
|
etmp = NULL;
|
|
}
|
|
if (in_bio != NULL) {
|
|
bio = in_bio;
|
|
} else {
|
|
if (data_body->length > 0)
|
|
bio = BIO_new_mem_buf(data_body->data, data_body->length);
|
|
else {
|
|
bio = BIO_new(BIO_s_mem());
|
|
if (bio == NULL)
|
|
goto err;
|
|
BIO_set_mem_eof_return(bio, 0);
|
|
}
|
|
if (bio == NULL)
|
|
goto err;
|
|
}
|
|
BIO_push(out, bio);
|
|
bio = NULL;
|
|
return out;
|
|
|
|
err:
|
|
OPENSSL_clear_free(ek, eklen);
|
|
OPENSSL_clear_free(tkey, tkeylen);
|
|
BIO_free_all(out);
|
|
BIO_free_all(btmp);
|
|
BIO_free_all(etmp);
|
|
BIO_free_all(bio);
|
|
return NULL;
|
|
}
|
|
|
|
static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
|
|
{
|
|
for (;;) {
|
|
bio = BIO_find_type(bio, BIO_TYPE_MD);
|
|
if (bio == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
|
|
PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
|
|
return NULL;
|
|
}
|
|
BIO_get_md_ctx(bio, pmd);
|
|
if (*pmd == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
|
|
return NULL;
|
|
}
|
|
if (EVP_MD_CTX_type(*pmd) == nid)
|
|
return bio;
|
|
bio = BIO_next(bio);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
|
|
{
|
|
unsigned char md_data[EVP_MAX_MD_SIZE];
|
|
unsigned int md_len;
|
|
|
|
/* Add signing time if not already present */
|
|
if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
|
|
if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
|
|
PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Add digest */
|
|
if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
|
|
PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
|
|
return 0;
|
|
}
|
|
if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
|
|
PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
|
|
/* Now sign the attributes */
|
|
if (!PKCS7_SIGNER_INFO_sign(si))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
|
|
{
|
|
int ret = 0;
|
|
int i, j;
|
|
BIO *btmp;
|
|
PKCS7_SIGNER_INFO *si;
|
|
EVP_MD_CTX *mdc, *ctx_tmp;
|
|
STACK_OF(X509_ATTRIBUTE) *sk;
|
|
STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
|
|
ASN1_OCTET_STRING *os = NULL;
|
|
|
|
if (p7 == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
|
|
return 0;
|
|
}
|
|
|
|
if (p7->d.ptr == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
|
|
return 0;
|
|
}
|
|
|
|
ctx_tmp = EVP_MD_CTX_new();
|
|
if (ctx_tmp == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
|
|
i = OBJ_obj2nid(p7->type);
|
|
p7->state = PKCS7_S_HEADER;
|
|
|
|
switch (i) {
|
|
case NID_pkcs7_data:
|
|
os = p7->d.data;
|
|
break;
|
|
case NID_pkcs7_signedAndEnveloped:
|
|
/* XXXXXXXXXXXXXXXX */
|
|
si_sk = p7->d.signed_and_enveloped->signer_info;
|
|
os = p7->d.signed_and_enveloped->enc_data->enc_data;
|
|
if (os == NULL) {
|
|
os = ASN1_OCTET_STRING_new();
|
|
if (os == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
p7->d.signed_and_enveloped->enc_data->enc_data = os;
|
|
}
|
|
break;
|
|
case NID_pkcs7_enveloped:
|
|
/* XXXXXXXXXXXXXXXX */
|
|
os = p7->d.enveloped->enc_data->enc_data;
|
|
if (os == NULL) {
|
|
os = ASN1_OCTET_STRING_new();
|
|
if (os == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
p7->d.enveloped->enc_data->enc_data = os;
|
|
}
|
|
break;
|
|
case NID_pkcs7_signed:
|
|
si_sk = p7->d.sign->signer_info;
|
|
os = PKCS7_get_octet_string(p7->d.sign->contents);
|
|
/* If detached data then the content is excluded */
|
|
if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
|
|
ASN1_OCTET_STRING_free(os);
|
|
os = NULL;
|
|
p7->d.sign->contents->d.data = NULL;
|
|
}
|
|
break;
|
|
|
|
case NID_pkcs7_digest:
|
|
os = PKCS7_get_octet_string(p7->d.digest->contents);
|
|
/* If detached data then the content is excluded */
|
|
if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
|
|
ASN1_OCTET_STRING_free(os);
|
|
os = NULL;
|
|
p7->d.digest->contents->d.data = NULL;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
|
|
goto err;
|
|
}
|
|
|
|
if (si_sk != NULL) {
|
|
for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
|
|
si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
|
|
if (si->pkey == NULL)
|
|
continue;
|
|
|
|
j = OBJ_obj2nid(si->digest_alg->algorithm);
|
|
|
|
btmp = bio;
|
|
|
|
btmp = PKCS7_find_digest(&mdc, btmp, j);
|
|
|
|
if (btmp == NULL)
|
|
goto err;
|
|
|
|
/*
|
|
* We now have the EVP_MD_CTX, lets do the signing.
|
|
*/
|
|
if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
|
|
goto err;
|
|
|
|
sk = si->auth_attr;
|
|
|
|
/*
|
|
* If there are attributes, we add the digest attribute and only
|
|
* sign the attributes
|
|
*/
|
|
if (sk_X509_ATTRIBUTE_num(sk) > 0) {
|
|
if (!do_pkcs7_signed_attrib(si, ctx_tmp))
|
|
goto err;
|
|
} else {
|
|
unsigned char *abuf = NULL;
|
|
unsigned int abuflen;
|
|
abuflen = EVP_PKEY_size(si->pkey);
|
|
abuf = OPENSSL_malloc(abuflen);
|
|
if (abuf == NULL)
|
|
goto err;
|
|
|
|
if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
|
|
OPENSSL_free(abuf);
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
|
|
goto err;
|
|
}
|
|
ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
|
|
}
|
|
}
|
|
} else if (i == NID_pkcs7_digest) {
|
|
unsigned char md_data[EVP_MAX_MD_SIZE];
|
|
unsigned int md_len;
|
|
if (!PKCS7_find_digest(&mdc, bio,
|
|
OBJ_obj2nid(p7->d.digest->md->algorithm)))
|
|
goto err;
|
|
if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
|
|
goto err;
|
|
if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
|
|
goto err;
|
|
}
|
|
|
|
if (!PKCS7_is_detached(p7)) {
|
|
/*
|
|
* NOTE(emilia): I think we only reach os == NULL here because detached
|
|
* digested data support is broken.
|
|
*/
|
|
if (os == NULL)
|
|
goto err;
|
|
if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
|
|
char *cont;
|
|
long contlen;
|
|
btmp = BIO_find_type(bio, BIO_TYPE_MEM);
|
|
if (btmp == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
|
|
goto err;
|
|
}
|
|
contlen = BIO_get_mem_data(btmp, &cont);
|
|
/*
|
|
* Mark the BIO read only then we can use its copy of the data
|
|
* instead of making an extra copy.
|
|
*/
|
|
BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
|
|
BIO_set_mem_eof_return(btmp, 0);
|
|
ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
|
|
}
|
|
}
|
|
ret = 1;
|
|
err:
|
|
EVP_MD_CTX_free(ctx_tmp);
|
|
return ret;
|
|
}
|
|
|
|
int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
|
|
{
|
|
EVP_MD_CTX *mctx;
|
|
EVP_PKEY_CTX *pctx = NULL;
|
|
unsigned char *abuf = NULL;
|
|
int alen;
|
|
size_t siglen;
|
|
const EVP_MD *md = NULL;
|
|
|
|
md = EVP_get_digestbyobj(si->digest_alg->algorithm);
|
|
if (md == NULL)
|
|
return 0;
|
|
|
|
mctx = EVP_MD_CTX_new();
|
|
if (mctx == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
|
|
goto err;
|
|
|
|
if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
|
|
EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
|
|
ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
|
|
if (!abuf)
|
|
goto err;
|
|
if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
|
|
goto err;
|
|
OPENSSL_free(abuf);
|
|
abuf = NULL;
|
|
if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
|
|
goto err;
|
|
abuf = OPENSSL_malloc(siglen);
|
|
if (abuf == NULL)
|
|
goto err;
|
|
if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
|
|
goto err;
|
|
|
|
if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
|
|
EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
|
|
goto err;
|
|
}
|
|
|
|
EVP_MD_CTX_free(mctx);
|
|
|
|
ASN1_STRING_set0(si->enc_digest, abuf, siglen);
|
|
|
|
return 1;
|
|
|
|
err:
|
|
OPENSSL_free(abuf);
|
|
EVP_MD_CTX_free(mctx);
|
|
return 0;
|
|
|
|
}
|
|
|
|
int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
|
|
PKCS7 *p7, PKCS7_SIGNER_INFO *si)
|
|
{
|
|
PKCS7_ISSUER_AND_SERIAL *ias;
|
|
int ret = 0, i;
|
|
STACK_OF(X509) *cert;
|
|
X509 *x509;
|
|
|
|
if (p7 == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
|
|
return 0;
|
|
}
|
|
|
|
if (p7->d.ptr == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
|
|
return 0;
|
|
}
|
|
|
|
if (PKCS7_type_is_signed(p7)) {
|
|
cert = p7->d.sign->cert;
|
|
} else if (PKCS7_type_is_signedAndEnveloped(p7)) {
|
|
cert = p7->d.signed_and_enveloped->cert;
|
|
} else {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
|
|
goto err;
|
|
}
|
|
/* XXXXXXXXXXXXXXXXXXXXXXX */
|
|
ias = si->issuer_and_serial;
|
|
|
|
x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
|
|
|
|
/* were we able to find the cert in passed to us */
|
|
if (x509 == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
|
|
PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
|
|
goto err;
|
|
}
|
|
|
|
/* Lets verify */
|
|
if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
|
|
goto err;
|
|
}
|
|
X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
|
|
i = X509_verify_cert(ctx);
|
|
if (i <= 0) {
|
|
PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
|
|
X509_STORE_CTX_cleanup(ctx);
|
|
goto err;
|
|
}
|
|
X509_STORE_CTX_cleanup(ctx);
|
|
|
|
return PKCS7_signatureVerify(bio, p7, si, x509);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
|
|
X509 *x509)
|
|
{
|
|
ASN1_OCTET_STRING *os;
|
|
EVP_MD_CTX *mdc_tmp, *mdc;
|
|
int ret = 0, i;
|
|
int md_type;
|
|
STACK_OF(X509_ATTRIBUTE) *sk;
|
|
BIO *btmp;
|
|
EVP_PKEY *pkey;
|
|
|
|
mdc_tmp = EVP_MD_CTX_new();
|
|
if (mdc_tmp == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
|
|
goto err;
|
|
}
|
|
|
|
md_type = OBJ_obj2nid(si->digest_alg->algorithm);
|
|
|
|
btmp = bio;
|
|
for (;;) {
|
|
if ((btmp == NULL) ||
|
|
((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
|
|
PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
|
|
goto err;
|
|
}
|
|
BIO_get_md_ctx(btmp, &mdc);
|
|
if (mdc == NULL) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
if (EVP_MD_CTX_type(mdc) == md_type)
|
|
break;
|
|
/*
|
|
* Workaround for some broken clients that put the signature OID
|
|
* instead of the digest OID in digest_alg->algorithm
|
|
*/
|
|
if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
|
|
break;
|
|
btmp = BIO_next(btmp);
|
|
}
|
|
|
|
/*
|
|
* mdc is the digest ctx that we want, unless there are attributes, in
|
|
* which case the digest is the signed attributes
|
|
*/
|
|
if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
|
|
goto err;
|
|
|
|
sk = si->auth_attr;
|
|
if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
|
|
unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
|
|
unsigned int md_len;
|
|
int alen;
|
|
ASN1_OCTET_STRING *message_digest;
|
|
|
|
if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
|
|
goto err;
|
|
message_digest = PKCS7_digest_from_attributes(sk);
|
|
if (!message_digest) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
|
|
PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
|
|
goto err;
|
|
}
|
|
if ((message_digest->length != (int)md_len) ||
|
|
(memcmp(message_digest->data, md_dat, md_len))) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
|
|
ret = -1;
|
|
goto err;
|
|
}
|
|
|
|
if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
|
|
goto err;
|
|
|
|
alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
|
|
ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
|
|
if (alen <= 0) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
|
|
ret = -1;
|
|
goto err;
|
|
}
|
|
if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
|
|
goto err;
|
|
|
|
OPENSSL_free(abuf);
|
|
}
|
|
|
|
os = si->enc_digest;
|
|
pkey = X509_get0_pubkey(x509);
|
|
if (!pkey) {
|
|
ret = -1;
|
|
goto err;
|
|
}
|
|
|
|
i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
|
|
if (i <= 0) {
|
|
PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
|
|
ret = -1;
|
|
goto err;
|
|
}
|
|
ret = 1;
|
|
err:
|
|
EVP_MD_CTX_free(mdc_tmp);
|
|
return ret;
|
|
}
|
|
|
|
PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
|
|
{
|
|
STACK_OF(PKCS7_RECIP_INFO) *rsk;
|
|
PKCS7_RECIP_INFO *ri;
|
|
int i;
|
|
|
|
i = OBJ_obj2nid(p7->type);
|
|
if (i != NID_pkcs7_signedAndEnveloped)
|
|
return NULL;
|
|
if (p7->d.signed_and_enveloped == NULL)
|
|
return NULL;
|
|
rsk = p7->d.signed_and_enveloped->recipientinfo;
|
|
if (rsk == NULL)
|
|
return NULL;
|
|
if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
|
|
return NULL;
|
|
ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
|
|
return ri->issuer_and_serial;
|
|
}
|
|
|
|
ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
|
|
{
|
|
return get_attribute(si->auth_attr, nid);
|
|
}
|
|
|
|
ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
|
|
{
|
|
return get_attribute(si->unauth_attr, nid);
|
|
}
|
|
|
|
static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
|
|
{
|
|
int idx;
|
|
X509_ATTRIBUTE *xa;
|
|
idx = X509at_get_attr_by_NID(sk, nid, -1);
|
|
xa = X509at_get_attr(sk, idx);
|
|
return X509_ATTRIBUTE_get0_type(xa, 0);
|
|
}
|
|
|
|
ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
|
|
{
|
|
ASN1_TYPE *astype;
|
|
if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
|
|
return NULL;
|
|
return astype->value.octet_string;
|
|
}
|
|
|
|
int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
|
|
STACK_OF(X509_ATTRIBUTE) *sk)
|
|
{
|
|
int i;
|
|
|
|
sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
|
|
p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
|
|
if (p7si->auth_attr == NULL)
|
|
return 0;
|
|
for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
|
|
if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
|
|
X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
|
|
(sk, i))))
|
|
== NULL)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
|
|
STACK_OF(X509_ATTRIBUTE) *sk)
|
|
{
|
|
int i;
|
|
|
|
sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
|
|
p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
|
|
if (p7si->unauth_attr == NULL)
|
|
return 0;
|
|
for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
|
|
if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
|
|
X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
|
|
(sk, i))))
|
|
== NULL)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
|
|
void *value)
|
|
{
|
|
return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
|
|
}
|
|
|
|
int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
|
|
void *value)
|
|
{
|
|
return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
|
|
}
|
|
|
|
static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
|
|
void *value)
|
|
{
|
|
X509_ATTRIBUTE *attr = NULL;
|
|
|
|
if (*sk == NULL) {
|
|
if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
|
|
return 0;
|
|
new_attrib:
|
|
if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
|
|
return 0;
|
|
if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
|
|
X509_ATTRIBUTE_free(attr);
|
|
return 0;
|
|
}
|
|
} else {
|
|
int i;
|
|
|
|
for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
|
|
attr = sk_X509_ATTRIBUTE_value(*sk, i);
|
|
if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
|
|
X509_ATTRIBUTE_free(attr);
|
|
attr = X509_ATTRIBUTE_create(nid, atrtype, value);
|
|
if (attr == NULL)
|
|
return 0;
|
|
if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
|
|
X509_ATTRIBUTE_free(attr);
|
|
return 0;
|
|
}
|
|
goto end;
|
|
}
|
|
}
|
|
goto new_attrib;
|
|
}
|
|
end:
|
|
return 1;
|
|
}
|