1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <stdio.h> 11 #include <time.h> 12 #include <sys/types.h> 13 14 #include "internal/cryptlib.h" 15 16 #include <openssl/bn.h> 17 #include <openssl/x509.h> 18 #include <openssl/objects.h> 19 #include <openssl/buffer.h> 20 #include <openssl/evp.h> 21 #include "crypto/asn1.h" 22 #include "crypto/evp.h" 23 24 #ifndef NO_ASN1_OLD 25 26 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature, 27 char *data, EVP_PKEY *pkey) 28 { 29 EVP_MD_CTX *ctx = EVP_MD_CTX_new(); 30 const EVP_MD *type; 31 unsigned char *p, *buf_in = NULL; 32 int ret = -1, i, inl; 33 34 if (ctx == NULL) { 35 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE); 36 goto err; 37 } 38 i = OBJ_obj2nid(a->algorithm); 39 type = EVP_get_digestbyname(OBJ_nid2sn(i)); 40 if (type == NULL) { 41 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 42 goto err; 43 } 44 45 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { 46 ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 47 goto err; 48 } 49 50 inl = i2d(data, NULL); 51 if (inl <= 0) { 52 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_INTERNAL_ERROR); 53 goto err; 54 } 55 buf_in = OPENSSL_malloc((unsigned int)inl); 56 if (buf_in == NULL) { 57 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE); 58 goto err; 59 } 60 p = buf_in; 61 62 i2d(data, &p); 63 ret = EVP_VerifyInit_ex(ctx, type, NULL) 64 && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl); 65 66 OPENSSL_clear_free(buf_in, (unsigned int)inl); 67 68 if (!ret) { 69 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 70 goto err; 71 } 72 ret = -1; 73 74 if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data, 75 (unsigned int)signature->length, pkey) <= 0) { 76 ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); 77 ret = 0; 78 goto err; 79 } 80 ret = 1; 81 err: 82 EVP_MD_CTX_free(ctx); 83 return ret; 84 } 85 86 #endif 87 88 int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, 89 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) 90 { 91 EVP_MD_CTX *ctx = NULL; 92 unsigned char *buf_in = NULL; 93 int ret = -1, inl = 0; 94 int mdnid, pknid; 95 size_t inll = 0; 96 97 if (!pkey) { 98 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); 99 return -1; 100 } 101 102 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { 103 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); 104 return -1; 105 } 106 107 ctx = EVP_MD_CTX_new(); 108 if (ctx == NULL) { 109 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE); 110 goto err; 111 } 112 113 /* Convert signature OID into digest and public key OIDs */ 114 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) { 115 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 116 goto err; 117 } 118 if (mdnid == NID_undef) { 119 if (!pkey->ameth || !pkey->ameth->item_verify) { 120 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, 121 ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); 122 goto err; 123 } 124 ret = pkey->ameth->item_verify(ctx, it, asn, a, signature, pkey); 125 /* 126 * Return value of 2 means carry on, anything else means we exit 127 * straight away: either a fatal error of the underlying verification 128 * routine handles all verification. 129 */ 130 if (ret != 2) 131 goto err; 132 ret = -1; 133 } else { 134 const EVP_MD *type = EVP_get_digestbynid(mdnid); 135 136 if (type == NULL) { 137 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, 138 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); 139 goto err; 140 } 141 142 /* Check public key OID matches public key type */ 143 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) { 144 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE); 145 goto err; 146 } 147 148 if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) { 149 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 150 ret = 0; 151 goto err; 152 } 153 154 } 155 156 inl = ASN1_item_i2d(asn, &buf_in, it); 157 if (inl <= 0) { 158 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_INTERNAL_ERROR); 159 goto err; 160 } 161 if (buf_in == NULL) { 162 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE); 163 goto err; 164 } 165 inll = inl; 166 167 ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length, 168 buf_in, inl); 169 if (ret <= 0) { 170 ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); 171 goto err; 172 } 173 ret = 1; 174 err: 175 OPENSSL_clear_free(buf_in, inll); 176 EVP_MD_CTX_free(ctx); 177 return ret; 178 } 179