[331] | 1 | /*
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| 2 | * Copyright 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 | #ifdef OPENSSL_NO_CT
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| 11 | # error "CT disabled"
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| 12 | #endif
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| 13 |
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| 14 | #include <openssl/ct.h>
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| 15 | #include <openssl/err.h>
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| 16 | #include <openssl/evp.h>
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| 17 | #include <openssl/tls1.h>
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| 18 | #include <openssl/x509.h>
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| 19 |
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| 20 | #include "ct_locl.h"
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| 21 |
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| 22 | SCT *SCT_new(void)
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| 23 | {
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| 24 | SCT *sct = OPENSSL_zalloc(sizeof(*sct));
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| 25 |
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| 26 | if (sct == NULL) {
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| 27 | CTerr(CT_F_SCT_NEW, ERR_R_MALLOC_FAILURE);
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| 28 | return NULL;
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| 29 | }
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| 30 |
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| 31 | sct->entry_type = CT_LOG_ENTRY_TYPE_NOT_SET;
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| 32 | sct->version = SCT_VERSION_NOT_SET;
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| 33 | return sct;
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| 34 | }
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| 35 |
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| 36 | void SCT_free(SCT *sct)
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| 37 | {
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| 38 | if (sct == NULL)
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| 39 | return;
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| 40 |
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| 41 | OPENSSL_free(sct->log_id);
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| 42 | OPENSSL_free(sct->ext);
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| 43 | OPENSSL_free(sct->sig);
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| 44 | OPENSSL_free(sct->sct);
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| 45 | OPENSSL_free(sct);
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| 46 | }
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| 47 |
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| 48 | void SCT_LIST_free(STACK_OF(SCT) *a)
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| 49 | {
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| 50 | sk_SCT_pop_free(a, SCT_free);
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| 51 | }
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| 52 |
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| 53 | int SCT_set_version(SCT *sct, sct_version_t version)
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| 54 | {
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| 55 | if (version != SCT_VERSION_V1) {
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| 56 | CTerr(CT_F_SCT_SET_VERSION, CT_R_UNSUPPORTED_VERSION);
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| 57 | return 0;
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| 58 | }
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| 59 | sct->version = version;
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| 60 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 61 | return 1;
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| 62 | }
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| 63 |
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| 64 | int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type)
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| 65 | {
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| 66 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 67 |
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| 68 | switch (entry_type) {
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| 69 | case CT_LOG_ENTRY_TYPE_X509:
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| 70 | case CT_LOG_ENTRY_TYPE_PRECERT:
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| 71 | sct->entry_type = entry_type;
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| 72 | return 1;
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| 73 | default:
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| 74 | CTerr(CT_F_SCT_SET_LOG_ENTRY_TYPE, CT_R_UNSUPPORTED_ENTRY_TYPE);
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| 75 | return 0;
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len)
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| 80 | {
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| 81 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) {
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| 82 | CTerr(CT_F_SCT_SET0_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH);
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| 83 | return 0;
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| 84 | }
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| 85 |
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| 86 | OPENSSL_free(sct->log_id);
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| 87 | sct->log_id = log_id;
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| 88 | sct->log_id_len = log_id_len;
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| 89 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 90 | return 1;
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| 91 | }
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| 92 |
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| 93 | int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len)
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| 94 | {
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| 95 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) {
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| 96 | CTerr(CT_F_SCT_SET1_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH);
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| 97 | return 0;
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| 98 | }
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| 99 |
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| 100 | OPENSSL_free(sct->log_id);
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| 101 | sct->log_id = NULL;
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| 102 | sct->log_id_len = 0;
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| 103 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 104 |
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| 105 | if (log_id != NULL && log_id_len > 0) {
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| 106 | sct->log_id = OPENSSL_memdup(log_id, log_id_len);
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| 107 | if (sct->log_id == NULL) {
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| 108 | CTerr(CT_F_SCT_SET1_LOG_ID, ERR_R_MALLOC_FAILURE);
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| 109 | return 0;
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| 110 | }
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| 111 | sct->log_id_len = log_id_len;
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| 112 | }
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| 113 | return 1;
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| 114 | }
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| 115 |
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| 116 |
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| 117 | void SCT_set_timestamp(SCT *sct, uint64_t timestamp)
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| 118 | {
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| 119 | sct->timestamp = timestamp;
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| 120 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 121 | }
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| 122 |
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| 123 | int SCT_set_signature_nid(SCT *sct, int nid)
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| 124 | {
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| 125 | switch (nid) {
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| 126 | case NID_sha256WithRSAEncryption:
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| 127 | sct->hash_alg = TLSEXT_hash_sha256;
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| 128 | sct->sig_alg = TLSEXT_signature_rsa;
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| 129 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 130 | return 1;
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| 131 | case NID_ecdsa_with_SHA256:
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| 132 | sct->hash_alg = TLSEXT_hash_sha256;
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| 133 | sct->sig_alg = TLSEXT_signature_ecdsa;
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| 134 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 135 | return 1;
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| 136 | default:
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| 137 | CTerr(CT_F_SCT_SET_SIGNATURE_NID, CT_R_UNRECOGNIZED_SIGNATURE_NID);
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| 138 | return 0;
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| 139 | }
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| 140 | }
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| 141 |
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| 142 | void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len)
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| 143 | {
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| 144 | OPENSSL_free(sct->ext);
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| 145 | sct->ext = ext;
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| 146 | sct->ext_len = ext_len;
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| 147 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 148 | }
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| 149 |
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| 150 | int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len)
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| 151 | {
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| 152 | OPENSSL_free(sct->ext);
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| 153 | sct->ext = NULL;
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| 154 | sct->ext_len = 0;
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| 155 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 156 |
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| 157 | if (ext != NULL && ext_len > 0) {
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| 158 | sct->ext = OPENSSL_memdup(ext, ext_len);
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| 159 | if (sct->ext == NULL) {
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| 160 | CTerr(CT_F_SCT_SET1_EXTENSIONS, ERR_R_MALLOC_FAILURE);
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| 161 | return 0;
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| 162 | }
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| 163 | sct->ext_len = ext_len;
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| 164 | }
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| 165 | return 1;
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| 166 | }
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| 167 |
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| 168 | void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len)
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| 169 | {
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| 170 | OPENSSL_free(sct->sig);
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| 171 | sct->sig = sig;
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| 172 | sct->sig_len = sig_len;
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| 173 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 174 | }
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| 175 |
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| 176 | int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len)
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| 177 | {
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| 178 | OPENSSL_free(sct->sig);
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| 179 | sct->sig = NULL;
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| 180 | sct->sig_len = 0;
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| 181 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 182 |
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| 183 | if (sig != NULL && sig_len > 0) {
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| 184 | sct->sig = OPENSSL_memdup(sig, sig_len);
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| 185 | if (sct->sig == NULL) {
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| 186 | CTerr(CT_F_SCT_SET1_SIGNATURE, ERR_R_MALLOC_FAILURE);
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| 187 | return 0;
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| 188 | }
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| 189 | sct->sig_len = sig_len;
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| 190 | }
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| 191 | return 1;
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| 192 | }
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| 193 |
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| 194 | sct_version_t SCT_get_version(const SCT *sct)
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| 195 | {
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| 196 | return sct->version;
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| 197 | }
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| 198 |
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| 199 | ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct)
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| 200 | {
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| 201 | return sct->entry_type;
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| 202 | }
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| 203 |
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| 204 | size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id)
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| 205 | {
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| 206 | *log_id = sct->log_id;
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| 207 | return sct->log_id_len;
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| 208 | }
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| 209 |
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| 210 | uint64_t SCT_get_timestamp(const SCT *sct)
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| 211 | {
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| 212 | return sct->timestamp;
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| 213 | }
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| 214 |
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| 215 | int SCT_get_signature_nid(const SCT *sct)
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| 216 | {
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| 217 | if (sct->version == SCT_VERSION_V1) {
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| 218 | if (sct->hash_alg == TLSEXT_hash_sha256) {
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| 219 | switch (sct->sig_alg) {
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| 220 | case TLSEXT_signature_ecdsa:
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| 221 | return NID_ecdsa_with_SHA256;
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| 222 | case TLSEXT_signature_rsa:
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| 223 | return NID_sha256WithRSAEncryption;
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| 224 | default:
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| 225 | return NID_undef;
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| 226 | }
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| 227 | }
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| 228 | }
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| 229 | return NID_undef;
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| 230 | }
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| 231 |
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| 232 | size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext)
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| 233 | {
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| 234 | *ext = sct->ext;
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| 235 | return sct->ext_len;
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| 236 | }
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| 237 |
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| 238 | size_t SCT_get0_signature(const SCT *sct, unsigned char **sig)
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| 239 | {
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| 240 | *sig = sct->sig;
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| 241 | return sct->sig_len;
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| 242 | }
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| 243 |
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| 244 | int SCT_is_complete(const SCT *sct)
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| 245 | {
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| 246 | switch (sct->version) {
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| 247 | case SCT_VERSION_NOT_SET:
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| 248 | return 0;
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| 249 | case SCT_VERSION_V1:
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| 250 | return sct->log_id != NULL && SCT_signature_is_complete(sct);
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| 251 | default:
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| 252 | return sct->sct != NULL; /* Just need cached encoding */
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| 253 | }
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| 254 | }
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| 255 |
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| 256 | int SCT_signature_is_complete(const SCT *sct)
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| 257 | {
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| 258 | return SCT_get_signature_nid(sct) != NID_undef &&
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| 259 | sct->sig != NULL && sct->sig_len > 0;
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| 260 | }
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| 261 |
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| 262 | sct_source_t SCT_get_source(const SCT *sct)
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| 263 | {
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| 264 | return sct->source;
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| 265 | }
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| 266 |
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| 267 | int SCT_set_source(SCT *sct, sct_source_t source)
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| 268 | {
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| 269 | sct->source = source;
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| 270 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
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| 271 | switch (source) {
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| 272 | case SCT_SOURCE_TLS_EXTENSION:
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| 273 | case SCT_SOURCE_OCSP_STAPLED_RESPONSE:
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| 274 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_X509);
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| 275 | case SCT_SOURCE_X509V3_EXTENSION:
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| 276 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_PRECERT);
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| 277 | default: /* if we aren't sure, leave the log entry type alone */
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| 278 | return 1;
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| 279 | }
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| 280 | }
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| 281 |
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| 282 | sct_validation_status_t SCT_get_validation_status(const SCT *sct)
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| 283 | {
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| 284 | return sct->validation_status;
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| 285 | }
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| 286 |
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| 287 | int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx)
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| 288 | {
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| 289 | int is_sct_valid = -1;
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| 290 | SCT_CTX *sctx = NULL;
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| 291 | X509_PUBKEY *pub = NULL, *log_pkey = NULL;
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| 292 | const CTLOG *log;
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| 293 |
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| 294 | /*
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| 295 | * With an unrecognized SCT version we don't know what such an SCT means,
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| 296 | * let alone validate one. So we return validation failure (0).
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| 297 | */
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| 298 | if (sct->version != SCT_VERSION_V1) {
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| 299 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_VERSION;
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| 300 | return 0;
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| 301 | }
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| 302 |
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| 303 | log = CTLOG_STORE_get0_log_by_id(ctx->log_store,
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| 304 | sct->log_id, sct->log_id_len);
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| 305 |
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| 306 | /* Similarly, an SCT from an unknown log also cannot be validated. */
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| 307 | if (log == NULL) {
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| 308 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_LOG;
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| 309 | return 0;
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| 310 | }
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| 311 |
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| 312 | sctx = SCT_CTX_new();
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| 313 | if (sctx == NULL)
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| 314 | goto err;
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| 315 |
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| 316 | if (X509_PUBKEY_set(&log_pkey, CTLOG_get0_public_key(log)) != 1)
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| 317 | goto err;
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| 318 | if (SCT_CTX_set1_pubkey(sctx, log_pkey) != 1)
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| 319 | goto err;
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| 320 |
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| 321 | if (SCT_get_log_entry_type(sct) == CT_LOG_ENTRY_TYPE_PRECERT) {
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| 322 | EVP_PKEY *issuer_pkey;
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| 323 |
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| 324 | if (ctx->issuer == NULL) {
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| 325 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED;
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| 326 | goto end;
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| 327 | }
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| 328 |
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| 329 | issuer_pkey = X509_get0_pubkey(ctx->issuer);
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| 330 |
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| 331 | if (X509_PUBKEY_set(&pub, issuer_pkey) != 1)
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| 332 | goto err;
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| 333 | if (SCT_CTX_set1_issuer_pubkey(sctx, pub) != 1)
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| 334 | goto err;
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| 335 | }
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| 336 |
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| 337 | SCT_CTX_set_time(sctx, ctx->epoch_time_in_ms);
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| 338 |
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| 339 | /*
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| 340 | * XXX: Potential for optimization. This repeats some idempotent heavy
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| 341 | * lifting on the certificate for each candidate SCT, and appears to not
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| 342 | * use any information in the SCT itself, only the certificate is
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| 343 | * processed. So it may make more sense to to do this just once, perhaps
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| 344 | * associated with the shared (by all SCTs) policy eval ctx.
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| 345 | *
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| 346 | * XXX: Failure here is global (SCT independent) and represents either an
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| 347 | * issue with the certificate (e.g. duplicate extensions) or an out of
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| 348 | * memory condition. When the certificate is incompatible with CT, we just
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| 349 | * mark the SCTs invalid, rather than report a failure to determine the
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| 350 | * validation status. That way, callbacks that want to do "soft" SCT
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| 351 | * processing will not abort handshakes with false positive internal
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| 352 | * errors. Since the function does not distinguish between certificate
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| 353 | * issues (peer's fault) and internal problems (out fault) the safe thing
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| 354 | * to do is to report a validation failure and let the callback or
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| 355 | * application decide what to do.
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| 356 | */
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| 357 | if (SCT_CTX_set1_cert(sctx, ctx->cert, NULL) != 1)
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| 358 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED;
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| 359 | else
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| 360 | sct->validation_status = SCT_CTX_verify(sctx, sct) == 1 ?
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| 361 | SCT_VALIDATION_STATUS_VALID : SCT_VALIDATION_STATUS_INVALID;
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| 362 |
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| 363 | end:
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| 364 | is_sct_valid = sct->validation_status == SCT_VALIDATION_STATUS_VALID;
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| 365 | err:
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| 366 | X509_PUBKEY_free(pub);
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| 367 | X509_PUBKEY_free(log_pkey);
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| 368 | SCT_CTX_free(sctx);
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| 369 |
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| 370 | return is_sct_valid;
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| 371 | }
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| 372 |
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| 373 | int SCT_LIST_validate(const STACK_OF(SCT) *scts, CT_POLICY_EVAL_CTX *ctx)
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| 374 | {
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| 375 | int are_scts_valid = 1;
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| 376 | int sct_count = scts != NULL ? sk_SCT_num(scts) : 0;
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| 377 | int i;
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| 378 |
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| 379 | for (i = 0; i < sct_count; ++i) {
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| 380 | int is_sct_valid = -1;
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| 381 | SCT *sct = sk_SCT_value(scts, i);
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| 382 |
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| 383 | if (sct == NULL)
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| 384 | continue;
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| 385 |
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| 386 | is_sct_valid = SCT_validate(sct, ctx);
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| 387 | if (is_sct_valid < 0)
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| 388 | return is_sct_valid;
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| 389 | are_scts_valid &= is_sct_valid;
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| 390 | }
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| 391 |
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| 392 | return are_scts_valid;
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| 393 | }
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