[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/rand.h>
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| 13 | #include <openssl/objects.h>
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| 14 | #include <openssl/x509.h>
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| 15 | #include <openssl/x509v3.h>
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| 16 | #include <openssl/err.h>
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| 17 |
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| 18 | static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
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| 19 | void *value);
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| 20 | static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
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| 21 |
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| 22 | static int PKCS7_type_is_other(PKCS7 *p7)
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| 23 | {
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| 24 | int isOther = 1;
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| 25 |
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| 26 | int nid = OBJ_obj2nid(p7->type);
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| 27 |
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| 28 | switch (nid) {
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| 29 | case NID_pkcs7_data:
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| 30 | case NID_pkcs7_signed:
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| 31 | case NID_pkcs7_enveloped:
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| 32 | case NID_pkcs7_signedAndEnveloped:
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| 33 | case NID_pkcs7_digest:
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| 34 | case NID_pkcs7_encrypted:
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| 35 | isOther = 0;
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| 36 | break;
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| 37 | default:
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| 38 | isOther = 1;
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| 39 | }
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| 40 |
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| 41 | return isOther;
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| 42 |
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| 43 | }
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| 44 |
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| 45 | static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
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| 46 | {
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| 47 | if (PKCS7_type_is_data(p7))
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| 48 | return p7->d.data;
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| 49 | if (PKCS7_type_is_other(p7) && p7->d.other
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| 50 | && (p7->d.other->type == V_ASN1_OCTET_STRING))
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| 51 | return p7->d.other->value.octet_string;
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| 52 | return NULL;
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| 53 | }
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| 54 |
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| 55 | static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
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| 56 | {
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| 57 | BIO *btmp;
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| 58 | const EVP_MD *md;
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| 59 | if ((btmp = BIO_new(BIO_f_md())) == NULL) {
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| 60 | PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
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| 61 | goto err;
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| 62 | }
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| 63 |
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| 64 | md = EVP_get_digestbyobj(alg->algorithm);
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| 65 | if (md == NULL) {
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| 66 | PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
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| 67 | goto err;
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| 68 | }
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| 69 |
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| 70 | BIO_set_md(btmp, md);
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| 71 | if (*pbio == NULL)
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| 72 | *pbio = btmp;
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| 73 | else if (!BIO_push(*pbio, btmp)) {
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| 74 | PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
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| 75 | goto err;
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| 76 | }
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| 77 | btmp = NULL;
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| 78 |
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| 79 | return 1;
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| 80 |
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| 81 | err:
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| 82 | BIO_free(btmp);
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| 83 | return 0;
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| 84 |
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| 85 | }
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| 86 |
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| 87 | static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
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| 88 | unsigned char *key, int keylen)
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| 89 | {
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| 90 | EVP_PKEY_CTX *pctx = NULL;
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| 91 | EVP_PKEY *pkey = NULL;
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| 92 | unsigned char *ek = NULL;
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| 93 | int ret = 0;
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| 94 | size_t eklen;
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| 95 |
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| 96 | pkey = X509_get0_pubkey(ri->cert);
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| 97 |
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| 98 | if (!pkey)
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| 99 | return 0;
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| 100 |
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| 101 | pctx = EVP_PKEY_CTX_new(pkey, NULL);
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| 102 | if (!pctx)
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| 103 | return 0;
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| 104 |
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| 105 | if (EVP_PKEY_encrypt_init(pctx) <= 0)
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| 106 | goto err;
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| 107 |
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| 108 | if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
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| 109 | EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
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| 110 | PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
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| 111 | goto err;
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| 112 | }
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| 113 |
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| 114 | if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
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| 115 | goto err;
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| 116 |
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| 117 | ek = OPENSSL_malloc(eklen);
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| 118 |
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| 119 | if (ek == NULL) {
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| 120 | PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
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| 121 | goto err;
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| 122 | }
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| 123 |
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| 124 | if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
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| 125 | goto err;
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| 126 |
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| 127 | ASN1_STRING_set0(ri->enc_key, ek, eklen);
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| 128 | ek = NULL;
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| 129 |
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| 130 | ret = 1;
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| 131 |
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| 132 | err:
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| 133 | EVP_PKEY_CTX_free(pctx);
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| 134 | OPENSSL_free(ek);
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| 135 | return ret;
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| 136 |
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| 137 | }
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| 138 |
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| 139 | static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
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| 140 | PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
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| 141 | {
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| 142 | EVP_PKEY_CTX *pctx = NULL;
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| 143 | unsigned char *ek = NULL;
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| 144 | size_t eklen;
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| 145 |
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| 146 | int ret = -1;
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| 147 |
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| 148 | pctx = EVP_PKEY_CTX_new(pkey, NULL);
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| 149 | if (!pctx)
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| 150 | return -1;
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| 151 |
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| 152 | if (EVP_PKEY_decrypt_init(pctx) <= 0)
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| 153 | goto err;
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| 154 |
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| 155 | if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
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| 156 | EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
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| 157 | PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
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| 158 | goto err;
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| 159 | }
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| 160 |
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| 161 | if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
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| 162 | ri->enc_key->data, ri->enc_key->length) <= 0)
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| 163 | goto err;
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| 164 |
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| 165 | ek = OPENSSL_malloc(eklen);
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| 166 |
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| 167 | if (ek == NULL) {
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| 168 | PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
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| 169 | goto err;
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| 170 | }
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| 171 |
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| 172 | if (EVP_PKEY_decrypt(pctx, ek, &eklen,
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| 173 | ri->enc_key->data, ri->enc_key->length) <= 0) {
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| 174 | ret = 0;
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| 175 | PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
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| 176 | goto err;
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| 177 | }
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| 178 |
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| 179 | ret = 1;
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| 180 |
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| 181 | OPENSSL_clear_free(*pek, *peklen);
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| 182 | *pek = ek;
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| 183 | *peklen = eklen;
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| 184 |
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| 185 | err:
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| 186 | EVP_PKEY_CTX_free(pctx);
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| 187 | if (!ret)
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| 188 | OPENSSL_free(ek);
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| 189 |
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| 190 | return ret;
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| 191 | }
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| 192 |
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| 193 | BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
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| 194 | {
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| 195 | int i;
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| 196 | BIO *out = NULL, *btmp = NULL;
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| 197 | X509_ALGOR *xa = NULL;
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| 198 | const EVP_CIPHER *evp_cipher = NULL;
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| 199 | STACK_OF(X509_ALGOR) *md_sk = NULL;
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| 200 | STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
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| 201 | X509_ALGOR *xalg = NULL;
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| 202 | PKCS7_RECIP_INFO *ri = NULL;
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| 203 | ASN1_OCTET_STRING *os = NULL;
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| 204 |
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| 205 | if (p7 == NULL) {
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| 206 | PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
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| 207 | return NULL;
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| 208 | }
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| 209 | /*
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| 210 | * The content field in the PKCS7 ContentInfo is optional, but that really
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| 211 | * only applies to inner content (precisely, detached signatures).
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| 212 | *
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| 213 | * When reading content, missing outer content is therefore treated as an
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| 214 | * error.
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| 215 | *
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| 216 | * When creating content, PKCS7_content_new() must be called before
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| 217 | * calling this method, so a NULL p7->d is always an error.
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| 218 | */
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| 219 | if (p7->d.ptr == NULL) {
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| 220 | PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
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| 221 | return NULL;
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| 222 | }
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| 223 |
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| 224 | i = OBJ_obj2nid(p7->type);
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| 225 | p7->state = PKCS7_S_HEADER;
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| 226 |
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| 227 | switch (i) {
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| 228 | case NID_pkcs7_signed:
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| 229 | md_sk = p7->d.sign->md_algs;
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| 230 | os = PKCS7_get_octet_string(p7->d.sign->contents);
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| 231 | break;
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| 232 | case NID_pkcs7_signedAndEnveloped:
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| 233 | rsk = p7->d.signed_and_enveloped->recipientinfo;
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| 234 | md_sk = p7->d.signed_and_enveloped->md_algs;
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| 235 | xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
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| 236 | evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
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| 237 | if (evp_cipher == NULL) {
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| 238 | PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
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| 239 | goto err;
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| 240 | }
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| 241 | break;
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| 242 | case NID_pkcs7_enveloped:
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| 243 | rsk = p7->d.enveloped->recipientinfo;
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| 244 | xalg = p7->d.enveloped->enc_data->algorithm;
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| 245 | evp_cipher = p7->d.enveloped->enc_data->cipher;
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| 246 | if (evp_cipher == NULL) {
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| 247 | PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
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| 248 | goto err;
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| 249 | }
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| 250 | break;
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| 251 | case NID_pkcs7_digest:
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| 252 | xa = p7->d.digest->md;
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| 253 | os = PKCS7_get_octet_string(p7->d.digest->contents);
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| 254 | break;
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| 255 | case NID_pkcs7_data:
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| 256 | break;
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| 257 | default:
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| 258 | PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
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| 259 | goto err;
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| 260 | }
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| 261 |
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| 262 | for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
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| 263 | if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
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| 264 | goto err;
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| 265 |
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| 266 | if (xa && !PKCS7_bio_add_digest(&out, xa))
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| 267 | goto err;
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| 268 |
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| 269 | if (evp_cipher != NULL) {
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| 270 | unsigned char key[EVP_MAX_KEY_LENGTH];
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| 271 | unsigned char iv[EVP_MAX_IV_LENGTH];
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| 272 | int keylen, ivlen;
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| 273 | EVP_CIPHER_CTX *ctx;
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| 274 |
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| 275 | if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
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| 276 | PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
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| 277 | goto err;
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| 278 | }
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| 279 | BIO_get_cipher_ctx(btmp, &ctx);
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| 280 | keylen = EVP_CIPHER_key_length(evp_cipher);
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| 281 | ivlen = EVP_CIPHER_iv_length(evp_cipher);
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| 282 | xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
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| 283 | if (ivlen > 0)
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| 284 | if (RAND_bytes(iv, ivlen) <= 0)
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| 285 | goto err;
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| 286 | if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
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| 287 | goto err;
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| 288 | if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
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| 289 | goto err;
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| 290 | if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
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| 291 | goto err;
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| 292 |
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| 293 | if (ivlen > 0) {
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| 294 | if (xalg->parameter == NULL) {
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| 295 | xalg->parameter = ASN1_TYPE_new();
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| 296 | if (xalg->parameter == NULL)
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| 297 | goto err;
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| 298 | }
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| 299 | if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
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| 300 | goto err;
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| 301 | }
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| 302 |
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| 303 | /* Lets do the pub key stuff :-) */
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| 304 | for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
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| 305 | ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
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| 306 | if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
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| 307 | goto err;
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| 308 | }
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| 309 | OPENSSL_cleanse(key, keylen);
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| 310 |
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| 311 | if (out == NULL)
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| 312 | out = btmp;
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| 313 | else
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| 314 | BIO_push(out, btmp);
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| 315 | btmp = NULL;
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| 316 | }
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| 317 |
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| 318 | if (bio == NULL) {
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| 319 | if (PKCS7_is_detached(p7))
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| 320 | bio = BIO_new(BIO_s_null());
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| 321 | else if (os && os->length > 0)
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| 322 | bio = BIO_new_mem_buf(os->data, os->length);
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| 323 | if (bio == NULL) {
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| 324 | bio = BIO_new(BIO_s_mem());
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| 325 | if (bio == NULL)
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| 326 | goto err;
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| 327 | BIO_set_mem_eof_return(bio, 0);
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| 328 | }
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| 329 | }
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| 330 | if (out)
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| 331 | BIO_push(out, bio);
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| 332 | else
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| 333 | out = bio;
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| 334 | return out;
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| 335 |
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| 336 | err:
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| 337 | BIO_free_all(out);
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| 338 | BIO_free_all(btmp);
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| 339 | return NULL;
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| 340 | }
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| 341 |
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| 342 | static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
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| 343 | {
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| 344 | int ret;
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| 345 | ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
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| 346 | X509_get_issuer_name(pcert));
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| 347 | if (ret)
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| 348 | return ret;
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| 349 | return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
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| 350 | ri->issuer_and_serial->serial);
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| 351 | }
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| 352 |
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| 353 | /* int */
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| 354 | BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
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| 355 | {
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| 356 | int i, j;
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| 357 | BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
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| 358 | X509_ALGOR *xa;
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| 359 | ASN1_OCTET_STRING *data_body = NULL;
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| 360 | const EVP_MD *evp_md;
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| 361 | const EVP_CIPHER *evp_cipher = NULL;
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| 362 | EVP_CIPHER_CTX *evp_ctx = NULL;
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| 363 | X509_ALGOR *enc_alg = NULL;
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| 364 | STACK_OF(X509_ALGOR) *md_sk = NULL;
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| 365 | STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
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| 366 | PKCS7_RECIP_INFO *ri = NULL;
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| 367 | unsigned char *ek = NULL, *tkey = NULL;
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| 368 | int eklen = 0, tkeylen = 0;
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| 369 |
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| 370 | if (p7 == NULL) {
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| 371 | PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
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| 372 | return NULL;
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| 373 | }
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| 374 |
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| 375 | if (p7->d.ptr == NULL) {
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| 376 | PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
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| 377 | return NULL;
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| 378 | }
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| 379 |
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| 380 | i = OBJ_obj2nid(p7->type);
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| 381 | p7->state = PKCS7_S_HEADER;
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| 382 |
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| 383 | switch (i) {
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| 384 | case NID_pkcs7_signed:
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| 385 | /*
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| 386 | * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
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| 387 | * field and optional content.
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| 388 | * data_body is NULL if that structure has no (=detached) content
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| 389 | * or if the contentType is wrong (i.e., not "data").
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| 390 | */
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| 391 | data_body = PKCS7_get_octet_string(p7->d.sign->contents);
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| 392 | if (!PKCS7_is_detached(p7) && data_body == NULL) {
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| 393 | PKCS7err(PKCS7_F_PKCS7_DATADECODE,
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| 394 | PKCS7_R_INVALID_SIGNED_DATA_TYPE);
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| 395 | goto err;
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| 396 | }
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| 397 | md_sk = p7->d.sign->md_algs;
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| 398 | break;
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| 399 | case NID_pkcs7_signedAndEnveloped:
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| 400 | rsk = p7->d.signed_and_enveloped->recipientinfo;
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| 401 | md_sk = p7->d.signed_and_enveloped->md_algs;
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| 402 | /* data_body is NULL if the optional EncryptedContent is missing. */
|
---|
| 403 | data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
|
---|
| 404 | enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
|
---|
| 405 | evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
|
---|
| 406 | if (evp_cipher == NULL) {
|
---|
| 407 | PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
---|
| 408 | PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
|
---|
| 409 | goto err;
|
---|
| 410 | }
|
---|
| 411 | break;
|
---|
| 412 | case NID_pkcs7_enveloped:
|
---|
| 413 | rsk = p7->d.enveloped->recipientinfo;
|
---|
| 414 | enc_alg = p7->d.enveloped->enc_data->algorithm;
|
---|
| 415 | /* data_body is NULL if the optional EncryptedContent is missing. */
|
---|
| 416 | data_body = p7->d.enveloped->enc_data->enc_data;
|
---|
| 417 | evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
|
---|
| 418 | if (evp_cipher == NULL) {
|
---|
| 419 | PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
---|
| 420 | PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
|
---|
| 421 | goto err;
|
---|
| 422 | }
|
---|
| 423 | break;
|
---|
| 424 | default:
|
---|
| 425 | PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
|
---|
| 426 | goto err;
|
---|
| 427 | }
|
---|
| 428 |
|
---|
| 429 | /* Detached content must be supplied via in_bio instead. */
|
---|
| 430 | if (data_body == NULL && in_bio == NULL) {
|
---|
| 431 | PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
|
---|
| 432 | goto err;
|
---|
| 433 | }
|
---|
| 434 |
|
---|
| 435 | /* We will be checking the signature */
|
---|
| 436 | if (md_sk != NULL) {
|
---|
| 437 | for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
|
---|
| 438 | xa = sk_X509_ALGOR_value(md_sk, i);
|
---|
| 439 | if ((btmp = BIO_new(BIO_f_md())) == NULL) {
|
---|
| 440 | PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
|
---|
| 441 | goto err;
|
---|
| 442 | }
|
---|
| 443 |
|
---|
| 444 | j = OBJ_obj2nid(xa->algorithm);
|
---|
| 445 | evp_md = EVP_get_digestbynid(j);
|
---|
| 446 | if (evp_md == NULL) {
|
---|
| 447 | PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
---|
| 448 | PKCS7_R_UNKNOWN_DIGEST_TYPE);
|
---|
| 449 | goto err;
|
---|
| 450 | }
|
---|
| 451 |
|
---|
| 452 | BIO_set_md(btmp, evp_md);
|
---|
| 453 | if (out == NULL)
|
---|
| 454 | out = btmp;
|
---|
| 455 | else
|
---|
| 456 | BIO_push(out, btmp);
|
---|
| 457 | btmp = NULL;
|
---|
| 458 | }
|
---|
| 459 | }
|
---|
| 460 |
|
---|
| 461 | if (evp_cipher != NULL) {
|
---|
| 462 | if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
|
---|
| 463 | PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
|
---|
| 464 | goto err;
|
---|
| 465 | }
|
---|
| 466 |
|
---|
| 467 | /*
|
---|
| 468 | * It was encrypted, we need to decrypt the secret key with the
|
---|
| 469 | * private key
|
---|
| 470 | */
|
---|
| 471 |
|
---|
| 472 | /*
|
---|
| 473 | * Find the recipientInfo which matches the passed certificate (if
|
---|
| 474 | * any)
|
---|
| 475 | */
|
---|
| 476 |
|
---|
| 477 | if (pcert) {
|
---|
| 478 | for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
|
---|
| 479 | ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
|
---|
| 480 | if (!pkcs7_cmp_ri(ri, pcert))
|
---|
| 481 | break;
|
---|
| 482 | ri = NULL;
|
---|
| 483 | }
|
---|
| 484 | if (ri == NULL) {
|
---|
| 485 | PKCS7err(PKCS7_F_PKCS7_DATADECODE,
|
---|
| 486 | PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
|
---|
| 487 | goto err;
|
---|
| 488 | }
|
---|
| 489 | }
|
---|
| 490 |
|
---|
| 491 | /* If we haven't got a certificate try each ri in turn */
|
---|
| 492 | if (pcert == NULL) {
|
---|
| 493 | /*
|
---|
| 494 | * Always attempt to decrypt all rinfo even after success as a
|
---|
| 495 | * defence against MMA timing attacks.
|
---|
| 496 | */
|
---|
| 497 | for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
|
---|
| 498 | ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
|
---|
| 499 |
|
---|
| 500 | if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
|
---|
| 501 | goto err;
|
---|
| 502 | ERR_clear_error();
|
---|
| 503 | }
|
---|
| 504 | } else {
|
---|
| 505 | /* Only exit on fatal errors, not decrypt failure */
|
---|
| 506 | if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
|
---|
| 507 | goto err;
|
---|
| 508 | ERR_clear_error();
|
---|
| 509 | }
|
---|
| 510 |
|
---|
| 511 | evp_ctx = NULL;
|
---|
| 512 | BIO_get_cipher_ctx(etmp, &evp_ctx);
|
---|
| 513 | if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
|
---|
| 514 | goto err;
|
---|
| 515 | if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
|
---|
| 516 | goto err;
|
---|
| 517 | /* Generate random key as MMA defence */
|
---|
| 518 | tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
|
---|
| 519 | tkey = OPENSSL_malloc(tkeylen);
|
---|
| 520 | if (tkey == NULL)
|
---|
| 521 | goto err;
|
---|
| 522 | if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
|
---|
| 523 | goto err;
|
---|
| 524 | if (ek == NULL) {
|
---|
| 525 | ek = tkey;
|
---|
| 526 | eklen = tkeylen;
|
---|
| 527 | tkey = NULL;
|
---|
| 528 | }
|
---|
| 529 |
|
---|
| 530 | if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
|
---|
| 531 | /*
|
---|
| 532 | * Some S/MIME clients don't use the same key and effective key
|
---|
| 533 | * length. The key length is determined by the size of the
|
---|
| 534 | * decrypted RSA key.
|
---|
| 535 | */
|
---|
| 536 | if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
|
---|
| 537 | /* Use random key as MMA defence */
|
---|
| 538 | OPENSSL_clear_free(ek, eklen);
|
---|
| 539 | ek = tkey;
|
---|
| 540 | eklen = tkeylen;
|
---|
| 541 | tkey = NULL;
|
---|
| 542 | }
|
---|
| 543 | }
|
---|
| 544 | /* Clear errors so we don't leak information useful in MMA */
|
---|
| 545 | ERR_clear_error();
|
---|
| 546 | if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
|
---|
| 547 | goto err;
|
---|
| 548 |
|
---|
| 549 | OPENSSL_clear_free(ek, eklen);
|
---|
| 550 | ek = NULL;
|
---|
| 551 | OPENSSL_clear_free(tkey, tkeylen);
|
---|
| 552 | tkey = NULL;
|
---|
| 553 |
|
---|
| 554 | if (out == NULL)
|
---|
| 555 | out = etmp;
|
---|
| 556 | else
|
---|
| 557 | BIO_push(out, etmp);
|
---|
| 558 | etmp = NULL;
|
---|
| 559 | }
|
---|
| 560 | if (in_bio != NULL) {
|
---|
| 561 | bio = in_bio;
|
---|
| 562 | } else {
|
---|
| 563 | if (data_body->length > 0)
|
---|
| 564 | bio = BIO_new_mem_buf(data_body->data, data_body->length);
|
---|
| 565 | else {
|
---|
| 566 | bio = BIO_new(BIO_s_mem());
|
---|
| 567 | if (bio == NULL)
|
---|
| 568 | goto err;
|
---|
| 569 | BIO_set_mem_eof_return(bio, 0);
|
---|
| 570 | }
|
---|
| 571 | if (bio == NULL)
|
---|
| 572 | goto err;
|
---|
| 573 | }
|
---|
| 574 | BIO_push(out, bio);
|
---|
| 575 | bio = NULL;
|
---|
| 576 | return out;
|
---|
| 577 |
|
---|
| 578 | err:
|
---|
| 579 | OPENSSL_clear_free(ek, eklen);
|
---|
| 580 | OPENSSL_clear_free(tkey, tkeylen);
|
---|
| 581 | BIO_free_all(out);
|
---|
| 582 | BIO_free_all(btmp);
|
---|
| 583 | BIO_free_all(etmp);
|
---|
| 584 | BIO_free_all(bio);
|
---|
| 585 | return NULL;
|
---|
| 586 | }
|
---|
| 587 |
|
---|
| 588 | static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
|
---|
| 589 | {
|
---|
| 590 | for (;;) {
|
---|
| 591 | bio = BIO_find_type(bio, BIO_TYPE_MD);
|
---|
| 592 | if (bio == NULL) {
|
---|
| 593 | PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
|
---|
| 594 | PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
|
---|
| 595 | return NULL;
|
---|
| 596 | }
|
---|
| 597 | BIO_get_md_ctx(bio, pmd);
|
---|
| 598 | if (*pmd == NULL) {
|
---|
| 599 | PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
|
---|
| 600 | return NULL;
|
---|
| 601 | }
|
---|
| 602 | if (EVP_MD_CTX_type(*pmd) == nid)
|
---|
| 603 | return bio;
|
---|
| 604 | bio = BIO_next(bio);
|
---|
| 605 | }
|
---|
| 606 | return NULL;
|
---|
| 607 | }
|
---|
| 608 |
|
---|
| 609 | static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
|
---|
| 610 | {
|
---|
| 611 | unsigned char md_data[EVP_MAX_MD_SIZE];
|
---|
| 612 | unsigned int md_len;
|
---|
| 613 |
|
---|
| 614 | /* Add signing time if not already present */
|
---|
| 615 | if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
|
---|
| 616 | if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
|
---|
| 617 | PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
|
---|
| 618 | return 0;
|
---|
| 619 | }
|
---|
| 620 | }
|
---|
| 621 |
|
---|
| 622 | /* Add digest */
|
---|
| 623 | if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
|
---|
| 624 | PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
|
---|
| 625 | return 0;
|
---|
| 626 | }
|
---|
| 627 | if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
|
---|
| 628 | PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
|
---|
| 629 | return 0;
|
---|
| 630 | }
|
---|
| 631 |
|
---|
| 632 | /* Now sign the attributes */
|
---|
| 633 | if (!PKCS7_SIGNER_INFO_sign(si))
|
---|
| 634 | return 0;
|
---|
| 635 |
|
---|
| 636 | return 1;
|
---|
| 637 | }
|
---|
| 638 |
|
---|
| 639 | int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
|
---|
| 640 | {
|
---|
| 641 | int ret = 0;
|
---|
| 642 | int i, j;
|
---|
| 643 | BIO *btmp;
|
---|
| 644 | PKCS7_SIGNER_INFO *si;
|
---|
| 645 | EVP_MD_CTX *mdc, *ctx_tmp;
|
---|
| 646 | STACK_OF(X509_ATTRIBUTE) *sk;
|
---|
| 647 | STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
|
---|
| 648 | ASN1_OCTET_STRING *os = NULL;
|
---|
| 649 |
|
---|
| 650 | if (p7 == NULL) {
|
---|
| 651 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
|
---|
| 652 | return 0;
|
---|
| 653 | }
|
---|
| 654 |
|
---|
| 655 | if (p7->d.ptr == NULL) {
|
---|
| 656 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
|
---|
| 657 | return 0;
|
---|
| 658 | }
|
---|
| 659 |
|
---|
| 660 | ctx_tmp = EVP_MD_CTX_new();
|
---|
| 661 | if (ctx_tmp == NULL) {
|
---|
| 662 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
|
---|
| 663 | return 0;
|
---|
| 664 | }
|
---|
| 665 |
|
---|
| 666 | i = OBJ_obj2nid(p7->type);
|
---|
| 667 | p7->state = PKCS7_S_HEADER;
|
---|
| 668 |
|
---|
| 669 | switch (i) {
|
---|
| 670 | case NID_pkcs7_data:
|
---|
| 671 | os = p7->d.data;
|
---|
| 672 | break;
|
---|
| 673 | case NID_pkcs7_signedAndEnveloped:
|
---|
| 674 | /* XXXXXXXXXXXXXXXX */
|
---|
| 675 | si_sk = p7->d.signed_and_enveloped->signer_info;
|
---|
| 676 | os = p7->d.signed_and_enveloped->enc_data->enc_data;
|
---|
| 677 | if (os == NULL) {
|
---|
| 678 | os = ASN1_OCTET_STRING_new();
|
---|
| 679 | if (os == NULL) {
|
---|
| 680 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
|
---|
| 681 | goto err;
|
---|
| 682 | }
|
---|
| 683 | p7->d.signed_and_enveloped->enc_data->enc_data = os;
|
---|
| 684 | }
|
---|
| 685 | break;
|
---|
| 686 | case NID_pkcs7_enveloped:
|
---|
| 687 | /* XXXXXXXXXXXXXXXX */
|
---|
| 688 | os = p7->d.enveloped->enc_data->enc_data;
|
---|
| 689 | if (os == NULL) {
|
---|
| 690 | os = ASN1_OCTET_STRING_new();
|
---|
| 691 | if (os == NULL) {
|
---|
| 692 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
|
---|
| 693 | goto err;
|
---|
| 694 | }
|
---|
| 695 | p7->d.enveloped->enc_data->enc_data = os;
|
---|
| 696 | }
|
---|
| 697 | break;
|
---|
| 698 | case NID_pkcs7_signed:
|
---|
| 699 | si_sk = p7->d.sign->signer_info;
|
---|
| 700 | os = PKCS7_get_octet_string(p7->d.sign->contents);
|
---|
| 701 | /* If detached data then the content is excluded */
|
---|
| 702 | if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
|
---|
| 703 | ASN1_OCTET_STRING_free(os);
|
---|
| 704 | os = NULL;
|
---|
| 705 | p7->d.sign->contents->d.data = NULL;
|
---|
| 706 | }
|
---|
| 707 | break;
|
---|
| 708 |
|
---|
| 709 | case NID_pkcs7_digest:
|
---|
| 710 | os = PKCS7_get_octet_string(p7->d.digest->contents);
|
---|
| 711 | /* If detached data then the content is excluded */
|
---|
| 712 | if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
|
---|
| 713 | ASN1_OCTET_STRING_free(os);
|
---|
| 714 | os = NULL;
|
---|
| 715 | p7->d.digest->contents->d.data = NULL;
|
---|
| 716 | }
|
---|
| 717 | break;
|
---|
| 718 |
|
---|
| 719 | default:
|
---|
| 720 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
|
---|
| 721 | goto err;
|
---|
| 722 | }
|
---|
| 723 |
|
---|
| 724 | if (si_sk != NULL) {
|
---|
| 725 | for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
|
---|
| 726 | si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
|
---|
| 727 | if (si->pkey == NULL)
|
---|
| 728 | continue;
|
---|
| 729 |
|
---|
| 730 | j = OBJ_obj2nid(si->digest_alg->algorithm);
|
---|
| 731 |
|
---|
| 732 | btmp = bio;
|
---|
| 733 |
|
---|
| 734 | btmp = PKCS7_find_digest(&mdc, btmp, j);
|
---|
| 735 |
|
---|
| 736 | if (btmp == NULL)
|
---|
| 737 | goto err;
|
---|
| 738 |
|
---|
| 739 | /*
|
---|
| 740 | * We now have the EVP_MD_CTX, lets do the signing.
|
---|
| 741 | */
|
---|
| 742 | if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
|
---|
| 743 | goto err;
|
---|
| 744 |
|
---|
| 745 | sk = si->auth_attr;
|
---|
| 746 |
|
---|
| 747 | /*
|
---|
| 748 | * If there are attributes, we add the digest attribute and only
|
---|
| 749 | * sign the attributes
|
---|
| 750 | */
|
---|
| 751 | if (sk_X509_ATTRIBUTE_num(sk) > 0) {
|
---|
| 752 | if (!do_pkcs7_signed_attrib(si, ctx_tmp))
|
---|
| 753 | goto err;
|
---|
| 754 | } else {
|
---|
| 755 | unsigned char *abuf = NULL;
|
---|
| 756 | unsigned int abuflen;
|
---|
| 757 | abuflen = EVP_PKEY_size(si->pkey);
|
---|
| 758 | abuf = OPENSSL_malloc(abuflen);
|
---|
| 759 | if (abuf == NULL)
|
---|
| 760 | goto err;
|
---|
| 761 |
|
---|
| 762 | if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
|
---|
| 763 | OPENSSL_free(abuf);
|
---|
| 764 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
|
---|
| 765 | goto err;
|
---|
| 766 | }
|
---|
| 767 | ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
|
---|
| 768 | }
|
---|
| 769 | }
|
---|
| 770 | } else if (i == NID_pkcs7_digest) {
|
---|
| 771 | unsigned char md_data[EVP_MAX_MD_SIZE];
|
---|
| 772 | unsigned int md_len;
|
---|
| 773 | if (!PKCS7_find_digest(&mdc, bio,
|
---|
| 774 | OBJ_obj2nid(p7->d.digest->md->algorithm)))
|
---|
| 775 | goto err;
|
---|
| 776 | if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
|
---|
| 777 | goto err;
|
---|
| 778 | if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
|
---|
| 779 | goto err;
|
---|
| 780 | }
|
---|
| 781 |
|
---|
| 782 | if (!PKCS7_is_detached(p7)) {
|
---|
| 783 | /*
|
---|
| 784 | * NOTE(emilia): I think we only reach os == NULL here because detached
|
---|
| 785 | * digested data support is broken.
|
---|
| 786 | */
|
---|
| 787 | if (os == NULL)
|
---|
| 788 | goto err;
|
---|
| 789 | if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
|
---|
| 790 | char *cont;
|
---|
| 791 | long contlen;
|
---|
| 792 | btmp = BIO_find_type(bio, BIO_TYPE_MEM);
|
---|
| 793 | if (btmp == NULL) {
|
---|
| 794 | PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
|
---|
| 795 | goto err;
|
---|
| 796 | }
|
---|
| 797 | contlen = BIO_get_mem_data(btmp, &cont);
|
---|
| 798 | /*
|
---|
| 799 | * Mark the BIO read only then we can use its copy of the data
|
---|
| 800 | * instead of making an extra copy.
|
---|
| 801 | */
|
---|
| 802 | BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
|
---|
| 803 | BIO_set_mem_eof_return(btmp, 0);
|
---|
| 804 | ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
|
---|
| 805 | }
|
---|
| 806 | }
|
---|
| 807 | ret = 1;
|
---|
| 808 | err:
|
---|
| 809 | EVP_MD_CTX_free(ctx_tmp);
|
---|
| 810 | return (ret);
|
---|
| 811 | }
|
---|
| 812 |
|
---|
| 813 | int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
|
---|
| 814 | {
|
---|
| 815 | EVP_MD_CTX *mctx;
|
---|
| 816 | EVP_PKEY_CTX *pctx;
|
---|
| 817 | unsigned char *abuf = NULL;
|
---|
| 818 | int alen;
|
---|
| 819 | size_t siglen;
|
---|
| 820 | const EVP_MD *md = NULL;
|
---|
| 821 |
|
---|
| 822 | md = EVP_get_digestbyobj(si->digest_alg->algorithm);
|
---|
| 823 | if (md == NULL)
|
---|
| 824 | return 0;
|
---|
| 825 |
|
---|
| 826 | mctx = EVP_MD_CTX_new();
|
---|
| 827 | if (mctx == NULL) {
|
---|
| 828 | PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
|
---|
| 829 | goto err;
|
---|
| 830 | }
|
---|
| 831 |
|
---|
| 832 | if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
|
---|
| 833 | goto err;
|
---|
| 834 |
|
---|
| 835 | if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
|
---|
| 836 | EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
|
---|
| 837 | PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
|
---|
| 838 | goto err;
|
---|
| 839 | }
|
---|
| 840 |
|
---|
| 841 | alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
|
---|
| 842 | ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
|
---|
| 843 | if (!abuf)
|
---|
| 844 | goto err;
|
---|
| 845 | if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
|
---|
| 846 | goto err;
|
---|
| 847 | OPENSSL_free(abuf);
|
---|
| 848 | abuf = NULL;
|
---|
| 849 | if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
|
---|
| 850 | goto err;
|
---|
| 851 | abuf = OPENSSL_malloc(siglen);
|
---|
| 852 | if (abuf == NULL)
|
---|
| 853 | goto err;
|
---|
| 854 | if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
|
---|
| 855 | goto err;
|
---|
| 856 |
|
---|
| 857 | if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
|
---|
| 858 | EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
|
---|
| 859 | PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
|
---|
| 860 | goto err;
|
---|
| 861 | }
|
---|
| 862 |
|
---|
| 863 | EVP_MD_CTX_free(mctx);
|
---|
| 864 |
|
---|
| 865 | ASN1_STRING_set0(si->enc_digest, abuf, siglen);
|
---|
| 866 |
|
---|
| 867 | return 1;
|
---|
| 868 |
|
---|
| 869 | err:
|
---|
| 870 | OPENSSL_free(abuf);
|
---|
| 871 | EVP_MD_CTX_free(mctx);
|
---|
| 872 | return 0;
|
---|
| 873 |
|
---|
| 874 | }
|
---|
| 875 |
|
---|
| 876 | int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
|
---|
| 877 | PKCS7 *p7, PKCS7_SIGNER_INFO *si)
|
---|
| 878 | {
|
---|
| 879 | PKCS7_ISSUER_AND_SERIAL *ias;
|
---|
| 880 | int ret = 0, i;
|
---|
| 881 | STACK_OF(X509) *cert;
|
---|
| 882 | X509 *x509;
|
---|
| 883 |
|
---|
| 884 | if (p7 == NULL) {
|
---|
| 885 | PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
|
---|
| 886 | return 0;
|
---|
| 887 | }
|
---|
| 888 |
|
---|
| 889 | if (p7->d.ptr == NULL) {
|
---|
| 890 | PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
|
---|
| 891 | return 0;
|
---|
| 892 | }
|
---|
| 893 |
|
---|
| 894 | if (PKCS7_type_is_signed(p7)) {
|
---|
| 895 | cert = p7->d.sign->cert;
|
---|
| 896 | } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
|
---|
| 897 | cert = p7->d.signed_and_enveloped->cert;
|
---|
| 898 | } else {
|
---|
| 899 | PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
|
---|
| 900 | goto err;
|
---|
| 901 | }
|
---|
| 902 | /* XXXXXXXXXXXXXXXXXXXXXXX */
|
---|
| 903 | ias = si->issuer_and_serial;
|
---|
| 904 |
|
---|
| 905 | x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
|
---|
| 906 |
|
---|
| 907 | /* were we able to find the cert in passed to us */
|
---|
| 908 | if (x509 == NULL) {
|
---|
| 909 | PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
|
---|
| 910 | PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
|
---|
| 911 | goto err;
|
---|
| 912 | }
|
---|
| 913 |
|
---|
| 914 | /* Lets verify */
|
---|
| 915 | if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
|
---|
| 916 | PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
|
---|
| 917 | goto err;
|
---|
| 918 | }
|
---|
| 919 | X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
|
---|
| 920 | i = X509_verify_cert(ctx);
|
---|
| 921 | if (i <= 0) {
|
---|
| 922 | PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
|
---|
| 923 | X509_STORE_CTX_cleanup(ctx);
|
---|
| 924 | goto err;
|
---|
| 925 | }
|
---|
| 926 | X509_STORE_CTX_cleanup(ctx);
|
---|
| 927 |
|
---|
| 928 | return PKCS7_signatureVerify(bio, p7, si, x509);
|
---|
| 929 | err:
|
---|
| 930 | return ret;
|
---|
| 931 | }
|
---|
| 932 |
|
---|
| 933 | int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
|
---|
| 934 | X509 *x509)
|
---|
| 935 | {
|
---|
| 936 | ASN1_OCTET_STRING *os;
|
---|
| 937 | EVP_MD_CTX *mdc_tmp, *mdc;
|
---|
| 938 | int ret = 0, i;
|
---|
| 939 | int md_type;
|
---|
| 940 | STACK_OF(X509_ATTRIBUTE) *sk;
|
---|
| 941 | BIO *btmp;
|
---|
| 942 | EVP_PKEY *pkey;
|
---|
| 943 |
|
---|
| 944 | mdc_tmp = EVP_MD_CTX_new();
|
---|
| 945 | if (mdc_tmp == NULL) {
|
---|
| 946 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
|
---|
| 947 | goto err;
|
---|
| 948 | }
|
---|
| 949 |
|
---|
| 950 | if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
|
---|
| 951 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
|
---|
| 952 | goto err;
|
---|
| 953 | }
|
---|
| 954 |
|
---|
| 955 | md_type = OBJ_obj2nid(si->digest_alg->algorithm);
|
---|
| 956 |
|
---|
| 957 | btmp = bio;
|
---|
| 958 | for (;;) {
|
---|
| 959 | if ((btmp == NULL) ||
|
---|
| 960 | ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
|
---|
| 961 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
|
---|
| 962 | PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
|
---|
| 963 | goto err;
|
---|
| 964 | }
|
---|
| 965 | BIO_get_md_ctx(btmp, &mdc);
|
---|
| 966 | if (mdc == NULL) {
|
---|
| 967 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
|
---|
| 968 | goto err;
|
---|
| 969 | }
|
---|
| 970 | if (EVP_MD_CTX_type(mdc) == md_type)
|
---|
| 971 | break;
|
---|
| 972 | /*
|
---|
| 973 | * Workaround for some broken clients that put the signature OID
|
---|
| 974 | * instead of the digest OID in digest_alg->algorithm
|
---|
| 975 | */
|
---|
| 976 | if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
|
---|
| 977 | break;
|
---|
| 978 | btmp = BIO_next(btmp);
|
---|
| 979 | }
|
---|
| 980 |
|
---|
| 981 | /*
|
---|
| 982 | * mdc is the digest ctx that we want, unless there are attributes, in
|
---|
| 983 | * which case the digest is the signed attributes
|
---|
| 984 | */
|
---|
| 985 | if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
|
---|
| 986 | goto err;
|
---|
| 987 |
|
---|
| 988 | sk = si->auth_attr;
|
---|
| 989 | if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
|
---|
| 990 | unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
|
---|
| 991 | unsigned int md_len;
|
---|
| 992 | int alen;
|
---|
| 993 | ASN1_OCTET_STRING *message_digest;
|
---|
| 994 |
|
---|
| 995 | if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
|
---|
| 996 | goto err;
|
---|
| 997 | message_digest = PKCS7_digest_from_attributes(sk);
|
---|
| 998 | if (!message_digest) {
|
---|
| 999 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
|
---|
| 1000 | PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
|
---|
| 1001 | goto err;
|
---|
| 1002 | }
|
---|
| 1003 | if ((message_digest->length != (int)md_len) ||
|
---|
| 1004 | (memcmp(message_digest->data, md_dat, md_len))) {
|
---|
| 1005 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
|
---|
| 1006 | ret = -1;
|
---|
| 1007 | goto err;
|
---|
| 1008 | }
|
---|
| 1009 |
|
---|
| 1010 | if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
|
---|
| 1011 | goto err;
|
---|
| 1012 |
|
---|
| 1013 | alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
|
---|
| 1014 | ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
|
---|
| 1015 | if (alen <= 0) {
|
---|
| 1016 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
|
---|
| 1017 | ret = -1;
|
---|
| 1018 | goto err;
|
---|
| 1019 | }
|
---|
| 1020 | if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
|
---|
| 1021 | goto err;
|
---|
| 1022 |
|
---|
| 1023 | OPENSSL_free(abuf);
|
---|
| 1024 | }
|
---|
| 1025 |
|
---|
| 1026 | os = si->enc_digest;
|
---|
| 1027 | pkey = X509_get0_pubkey(x509);
|
---|
| 1028 | if (!pkey) {
|
---|
| 1029 | ret = -1;
|
---|
| 1030 | goto err;
|
---|
| 1031 | }
|
---|
| 1032 |
|
---|
| 1033 | i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
|
---|
| 1034 | if (i <= 0) {
|
---|
| 1035 | PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
|
---|
| 1036 | ret = -1;
|
---|
| 1037 | goto err;
|
---|
| 1038 | }
|
---|
| 1039 | ret = 1;
|
---|
| 1040 | err:
|
---|
| 1041 | EVP_MD_CTX_free(mdc_tmp);
|
---|
| 1042 | return (ret);
|
---|
| 1043 | }
|
---|
| 1044 |
|
---|
| 1045 | PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
|
---|
| 1046 | {
|
---|
| 1047 | STACK_OF(PKCS7_RECIP_INFO) *rsk;
|
---|
| 1048 | PKCS7_RECIP_INFO *ri;
|
---|
| 1049 | int i;
|
---|
| 1050 |
|
---|
| 1051 | i = OBJ_obj2nid(p7->type);
|
---|
| 1052 | if (i != NID_pkcs7_signedAndEnveloped)
|
---|
| 1053 | return NULL;
|
---|
| 1054 | if (p7->d.signed_and_enveloped == NULL)
|
---|
| 1055 | return NULL;
|
---|
| 1056 | rsk = p7->d.signed_and_enveloped->recipientinfo;
|
---|
| 1057 | if (rsk == NULL)
|
---|
| 1058 | return NULL;
|
---|
| 1059 | if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
|
---|
| 1060 | return (NULL);
|
---|
| 1061 | ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
|
---|
| 1062 | return (ri->issuer_and_serial);
|
---|
| 1063 | }
|
---|
| 1064 |
|
---|
| 1065 | ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
|
---|
| 1066 | {
|
---|
| 1067 | return (get_attribute(si->auth_attr, nid));
|
---|
| 1068 | }
|
---|
| 1069 |
|
---|
| 1070 | ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
|
---|
| 1071 | {
|
---|
| 1072 | return (get_attribute(si->unauth_attr, nid));
|
---|
| 1073 | }
|
---|
| 1074 |
|
---|
| 1075 | static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
|
---|
| 1076 | {
|
---|
| 1077 | int idx;
|
---|
| 1078 | X509_ATTRIBUTE *xa;
|
---|
| 1079 | idx = X509at_get_attr_by_NID(sk, nid, -1);
|
---|
| 1080 | xa = X509at_get_attr(sk, idx);
|
---|
| 1081 | return X509_ATTRIBUTE_get0_type(xa, 0);
|
---|
| 1082 | }
|
---|
| 1083 |
|
---|
| 1084 | ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
|
---|
| 1085 | {
|
---|
| 1086 | ASN1_TYPE *astype;
|
---|
| 1087 | if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
|
---|
| 1088 | return NULL;
|
---|
| 1089 | return astype->value.octet_string;
|
---|
| 1090 | }
|
---|
| 1091 |
|
---|
| 1092 | int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
|
---|
| 1093 | STACK_OF(X509_ATTRIBUTE) *sk)
|
---|
| 1094 | {
|
---|
| 1095 | int i;
|
---|
| 1096 |
|
---|
| 1097 | sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
|
---|
| 1098 | p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
|
---|
| 1099 | if (p7si->auth_attr == NULL)
|
---|
| 1100 | return 0;
|
---|
| 1101 | for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
|
---|
| 1102 | if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
|
---|
| 1103 | X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
|
---|
| 1104 | (sk, i))))
|
---|
| 1105 | == NULL)
|
---|
| 1106 | return (0);
|
---|
| 1107 | }
|
---|
| 1108 | return (1);
|
---|
| 1109 | }
|
---|
| 1110 |
|
---|
| 1111 | int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
|
---|
| 1112 | STACK_OF(X509_ATTRIBUTE) *sk)
|
---|
| 1113 | {
|
---|
| 1114 | int i;
|
---|
| 1115 |
|
---|
| 1116 | sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
|
---|
| 1117 | p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
|
---|
| 1118 | if (p7si->unauth_attr == NULL)
|
---|
| 1119 | return 0;
|
---|
| 1120 | for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
|
---|
| 1121 | if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
|
---|
| 1122 | X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
|
---|
| 1123 | (sk, i))))
|
---|
| 1124 | == NULL)
|
---|
| 1125 | return (0);
|
---|
| 1126 | }
|
---|
| 1127 | return (1);
|
---|
| 1128 | }
|
---|
| 1129 |
|
---|
| 1130 | int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
|
---|
| 1131 | void *value)
|
---|
| 1132 | {
|
---|
| 1133 | return (add_attribute(&(p7si->auth_attr), nid, atrtype, value));
|
---|
| 1134 | }
|
---|
| 1135 |
|
---|
| 1136 | int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
|
---|
| 1137 | void *value)
|
---|
| 1138 | {
|
---|
| 1139 | return (add_attribute(&(p7si->unauth_attr), nid, atrtype, value));
|
---|
| 1140 | }
|
---|
| 1141 |
|
---|
| 1142 | static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
|
---|
| 1143 | void *value)
|
---|
| 1144 | {
|
---|
| 1145 | X509_ATTRIBUTE *attr = NULL;
|
---|
| 1146 |
|
---|
| 1147 | if (*sk == NULL) {
|
---|
| 1148 | if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
|
---|
| 1149 | return 0;
|
---|
| 1150 | new_attrib:
|
---|
| 1151 | if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
|
---|
| 1152 | return 0;
|
---|
| 1153 | if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
|
---|
| 1154 | X509_ATTRIBUTE_free(attr);
|
---|
| 1155 | return 0;
|
---|
| 1156 | }
|
---|
| 1157 | } else {
|
---|
| 1158 | int i;
|
---|
| 1159 |
|
---|
| 1160 | for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
|
---|
| 1161 | attr = sk_X509_ATTRIBUTE_value(*sk, i);
|
---|
| 1162 | if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
|
---|
| 1163 | X509_ATTRIBUTE_free(attr);
|
---|
| 1164 | attr = X509_ATTRIBUTE_create(nid, atrtype, value);
|
---|
| 1165 | if (attr == NULL)
|
---|
| 1166 | return 0;
|
---|
| 1167 | if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
|
---|
| 1168 | X509_ATTRIBUTE_free(attr);
|
---|
| 1169 | return 0;
|
---|
| 1170 | }
|
---|
| 1171 | goto end;
|
---|
| 1172 | }
|
---|
| 1173 | }
|
---|
| 1174 | goto new_attrib;
|
---|
| 1175 | }
|
---|
| 1176 | end:
|
---|
| 1177 | return (1);
|
---|
| 1178 | }
|
---|