1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 2010, DirecTV, Contact: Eric Hu, <ehu@directv.com>.
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9 | * Copyright (C) 2010 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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10 | *
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11 | * This software is licensed as described in the file COPYING, which
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12 | * you should have received as part of this distribution. The terms
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13 | * are also available at https://curl.haxx.se/docs/copyright.html.
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14 | *
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15 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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16 | * copies of the Software, and permit persons to whom the Software is
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17 | * furnished to do so, under the terms of the COPYING file.
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18 | *
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19 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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20 | * KIND, either express or implied.
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21 | *
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22 | ***************************************************************************/
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23 |
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24 | /*
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25 | * Source file for all axTLS-specific code for the TLS/SSL layer. No code
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26 | * but vtls.c should ever call or use these functions.
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27 | */
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28 |
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29 | #include "curl_setup.h"
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30 |
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31 | #ifdef USE_AXTLS
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32 | #include <axTLS/config.h>
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33 | #include <axTLS/ssl.h>
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34 | #include "axtls.h"
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35 |
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36 | #include "sendf.h"
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37 | #include "inet_pton.h"
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38 | #include "vtls.h"
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39 | #include "parsedate.h"
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40 | #include "connect.h" /* for the connect timeout */
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41 | #include "select.h"
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42 | #include "curl_printf.h"
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43 | #include "hostcheck.h"
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44 | #include <unistd.h>
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45 |
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46 | /* The last #include files should be: */
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47 | #include "curl_memory.h"
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48 | #include "memdebug.h"
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49 |
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50 | struct ssl_backend_data {
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51 | SSL_CTX* ssl_ctx;
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52 | SSL* ssl;
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53 | };
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54 |
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55 | #define BACKEND connssl->backend
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56 |
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57 | static CURLcode map_error_to_curl(int axtls_err)
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58 | {
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59 | switch(axtls_err) {
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60 | case SSL_ERROR_NOT_SUPPORTED:
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61 | case SSL_ERROR_INVALID_VERSION:
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62 | case -70: /* protocol version alert from server */
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63 | return CURLE_UNSUPPORTED_PROTOCOL;
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64 | break;
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65 | case SSL_ERROR_NO_CIPHER:
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66 | return CURLE_SSL_CIPHER;
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67 | break;
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68 | case SSL_ERROR_BAD_CERTIFICATE: /* this may be bad server cert too */
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69 | case SSL_ERROR_NO_CERT_DEFINED:
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70 | case -42: /* bad certificate alert from server */
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71 | case -43: /* unsupported cert alert from server */
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72 | case -44: /* cert revoked alert from server */
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73 | case -45: /* cert expired alert from server */
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74 | case -46: /* cert unknown alert from server */
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75 | return CURLE_SSL_CERTPROBLEM;
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76 | break;
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77 | case SSL_X509_ERROR(X509_NOT_OK):
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78 | case SSL_X509_ERROR(X509_VFY_ERROR_NO_TRUSTED_CERT):
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79 | case SSL_X509_ERROR(X509_VFY_ERROR_BAD_SIGNATURE):
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80 | case SSL_X509_ERROR(X509_VFY_ERROR_NOT_YET_VALID):
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81 | case SSL_X509_ERROR(X509_VFY_ERROR_EXPIRED):
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82 | case SSL_X509_ERROR(X509_VFY_ERROR_SELF_SIGNED):
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83 | case SSL_X509_ERROR(X509_VFY_ERROR_INVALID_CHAIN):
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84 | case SSL_X509_ERROR(X509_VFY_ERROR_UNSUPPORTED_DIGEST):
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85 | case SSL_X509_ERROR(X509_INVALID_PRIV_KEY):
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86 | return CURLE_PEER_FAILED_VERIFICATION;
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87 | break;
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88 | case -48: /* unknown ca alert from server */
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89 | return CURLE_SSL_CACERT;
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90 | break;
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91 | case -49: /* access denied alert from server */
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92 | return CURLE_REMOTE_ACCESS_DENIED;
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93 | break;
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94 | case SSL_ERROR_CONN_LOST:
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95 | case SSL_ERROR_SOCK_SETUP_FAILURE:
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96 | case SSL_ERROR_INVALID_HANDSHAKE:
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97 | case SSL_ERROR_INVALID_PROT_MSG:
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98 | case SSL_ERROR_INVALID_HMAC:
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99 | case SSL_ERROR_INVALID_SESSION:
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100 | case SSL_ERROR_INVALID_KEY: /* it's too bad this doesn't map better */
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101 | case SSL_ERROR_FINISHED_INVALID:
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102 | case SSL_ERROR_NO_CLIENT_RENOG:
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103 | default:
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104 | return CURLE_SSL_CONNECT_ERROR;
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105 | break;
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106 | }
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107 | }
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108 |
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109 | static Curl_recv axtls_recv;
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110 | static Curl_send axtls_send;
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111 |
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112 | static void free_ssl_structs(struct ssl_connect_data *connssl)
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113 | {
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114 | if(BACKEND->ssl) {
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115 | ssl_free(BACKEND->ssl);
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116 | BACKEND->ssl = NULL;
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117 | }
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118 | if(BACKEND->ssl_ctx) {
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119 | ssl_ctx_free(BACKEND->ssl_ctx);
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120 | BACKEND->ssl_ctx = NULL;
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121 | }
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122 | }
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123 |
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124 | /*
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125 | * For both blocking and non-blocking connects, this function sets up the
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126 | * ssl context and state. This function is called after the TCP connect
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127 | * has completed.
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128 | */
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129 | static CURLcode connect_prep(struct connectdata *conn, int sockindex)
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130 | {
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131 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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132 | struct Curl_easy *data = conn->data;
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133 | SSL_CTX *ssl_ctx;
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134 | SSL *ssl = NULL;
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135 | int cert_types[] = {SSL_OBJ_X509_CERT, SSL_OBJ_PKCS12, 0};
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136 | int key_types[] = {SSL_OBJ_RSA_KEY, SSL_OBJ_PKCS8, SSL_OBJ_PKCS12, 0};
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137 | int i, ssl_fcn_return;
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138 |
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139 | /* Assuming users will not compile in custom key/cert to axTLS.
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140 | * Also, even for blocking connects, use axTLS non-blocking feature.
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141 | */
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142 | uint32_t client_option = SSL_NO_DEFAULT_KEY |
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143 | SSL_SERVER_VERIFY_LATER |
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144 | SSL_CONNECT_IN_PARTS;
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145 |
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146 | if(connssl->state == ssl_connection_complete)
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147 | /* to make us tolerant against being called more than once for the
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148 | same connection */
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149 | return CURLE_OK;
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150 |
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151 | if(SSL_CONN_CONFIG(version_max) != CURL_SSLVERSION_MAX_NONE) {
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152 | failf(data, "axtls does not support CURL_SSLVERSION_MAX");
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153 | return CURLE_SSL_CONNECT_ERROR;
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154 | }
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155 |
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156 |
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157 | /* axTLS only supports TLSv1 */
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158 | /* check to see if we've been told to use an explicit SSL/TLS version */
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159 | switch(SSL_CONN_CONFIG(version)) {
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160 | case CURL_SSLVERSION_DEFAULT:
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161 | case CURL_SSLVERSION_TLSv1:
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162 | break;
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163 | default:
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164 | failf(data, "axTLS only supports TLS 1.0 and 1.1, "
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165 | "and it cannot be specified which one to use");
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166 | return CURLE_SSL_CONNECT_ERROR;
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167 | }
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168 |
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169 | #ifdef AXTLSDEBUG
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170 | client_option |= SSL_DISPLAY_STATES | SSL_DISPLAY_RSA | SSL_DISPLAY_CERTS;
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171 | #endif /* AXTLSDEBUG */
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172 |
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173 | /* Allocate an SSL_CTX struct */
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174 | ssl_ctx = ssl_ctx_new(client_option, SSL_DEFAULT_CLNT_SESS);
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175 | if(ssl_ctx == NULL) {
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176 | failf(data, "unable to create client SSL context");
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177 | return CURLE_SSL_CONNECT_ERROR;
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178 | }
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179 |
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180 | BACKEND->ssl_ctx = ssl_ctx;
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181 | BACKEND->ssl = NULL;
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182 |
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183 | /* Load the trusted CA cert bundle file */
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184 | if(SSL_CONN_CONFIG(CAfile)) {
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185 | if(ssl_obj_load(ssl_ctx, SSL_OBJ_X509_CACERT,
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186 | SSL_CONN_CONFIG(CAfile), NULL) != SSL_OK) {
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187 | infof(data, "error reading ca cert file %s \n",
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188 | SSL_CONN_CONFIG(CAfile));
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189 | if(SSL_CONN_CONFIG(verifypeer)) {
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190 | return CURLE_SSL_CACERT_BADFILE;
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191 | }
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192 | }
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193 | else
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194 | infof(data, "found certificates in %s\n", SSL_CONN_CONFIG(CAfile));
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195 | }
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196 |
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197 | /* gtls.c tasks we're skipping for now:
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198 | * 1) certificate revocation list checking
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199 | * 2) dns name assignment to host
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200 | * 3) set protocol priority. axTLS is TLSv1 only, so can probably ignore
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201 | * 4) set certificate priority. axTLS ignores type and sends certs in
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202 | * order added. can probably ignore this.
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203 | */
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204 |
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205 | /* Load client certificate */
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206 | if(SSL_SET_OPTION(cert)) {
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207 | i = 0;
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208 | /* Instead of trying to analyze cert type here, let axTLS try them all. */
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209 | while(cert_types[i] != 0) {
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210 | ssl_fcn_return = ssl_obj_load(ssl_ctx, cert_types[i],
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211 | SSL_SET_OPTION(cert), NULL);
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212 | if(ssl_fcn_return == SSL_OK) {
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213 | infof(data, "successfully read cert file %s \n",
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214 | SSL_SET_OPTION(cert));
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215 | break;
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216 | }
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217 | i++;
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218 | }
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219 | /* Tried all cert types, none worked. */
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220 | if(cert_types[i] == 0) {
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221 | failf(data, "%s is not x509 or pkcs12 format",
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222 | SSL_SET_OPTION(cert));
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223 | return CURLE_SSL_CERTPROBLEM;
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224 | }
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225 | }
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226 |
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227 | /* Load client key.
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228 | If a pkcs12 file successfully loaded a cert, then there's nothing to do
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229 | because the key has already been loaded. */
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230 | if(SSL_SET_OPTION(key) && cert_types[i] != SSL_OBJ_PKCS12) {
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231 | i = 0;
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232 | /* Instead of trying to analyze key type here, let axTLS try them all. */
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233 | while(key_types[i] != 0) {
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234 | ssl_fcn_return = ssl_obj_load(ssl_ctx, key_types[i],
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235 | SSL_SET_OPTION(key), NULL);
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236 | if(ssl_fcn_return == SSL_OK) {
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237 | infof(data, "successfully read key file %s \n",
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238 | SSL_SET_OPTION(key));
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239 | break;
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240 | }
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241 | i++;
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242 | }
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243 | /* Tried all key types, none worked. */
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244 | if(key_types[i] == 0) {
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245 | failf(data, "Failure: %s is not a supported key file",
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246 | SSL_SET_OPTION(key));
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247 | return CURLE_SSL_CONNECT_ERROR;
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248 | }
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249 | }
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250 |
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251 | /* gtls.c does more here that is being left out for now
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252 | * 1) set session credentials. can probably ignore since axtls puts this
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253 | * info in the ssl_ctx struct
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254 | * 2) setting up callbacks. these seem gnutls specific
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255 | */
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256 |
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257 | if(SSL_SET_OPTION(primary.sessionid)) {
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258 | const uint8_t *ssl_sessionid;
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259 | size_t ssl_idsize;
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260 |
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261 | /* In axTLS, handshaking happens inside ssl_client_new. */
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262 | Curl_ssl_sessionid_lock(conn);
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263 | if(!Curl_ssl_getsessionid(conn, (void **) &ssl_sessionid, &ssl_idsize,
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264 | sockindex)) {
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265 | /* we got a session id, use it! */
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266 | infof(data, "SSL re-using session ID\n");
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267 | ssl = ssl_client_new(ssl_ctx, conn->sock[sockindex],
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268 | ssl_sessionid, (uint8_t)ssl_idsize, NULL);
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269 | }
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270 | Curl_ssl_sessionid_unlock(conn);
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271 | }
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272 |
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273 | if(!ssl)
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274 | ssl = ssl_client_new(ssl_ctx, conn->sock[sockindex], NULL, 0, NULL);
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275 |
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276 | BACKEND->ssl = ssl;
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277 | return CURLE_OK;
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278 | }
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279 |
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280 | static void Curl_axtls_close(struct connectdata *conn, int sockindex)
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281 | {
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282 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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283 |
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284 | infof(conn->data, " Curl_axtls_close\n");
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285 |
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286 | /* line from openssl.c: (void)SSL_shutdown(BACKEND->ssl);
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287 | axTLS compat layer does nothing for SSL_shutdown */
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288 |
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289 | /* The following line is from openssl.c. There seems to be no axTLS
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290 | equivalent. ssl_free and ssl_ctx_free close things.
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291 | SSL_set_connect_state(connssl->handle); */
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292 |
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293 | free_ssl_structs(connssl);
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294 | }
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295 |
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296 | /*
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297 | * For both blocking and non-blocking connects, this function finalizes the
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298 | * SSL connection.
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299 | */
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300 | static CURLcode connect_finish(struct connectdata *conn, int sockindex)
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301 | {
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302 | struct Curl_easy *data = conn->data;
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303 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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304 | SSL *ssl = BACKEND->ssl;
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305 | const char *peer_CN;
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306 | uint32_t dns_altname_index;
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307 | const char *dns_altname;
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308 | int8_t found_subject_alt_names = 0;
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309 | int8_t found_subject_alt_name_matching_conn = 0;
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310 | const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
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311 | conn->host.name;
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312 | const char * const dispname = SSL_IS_PROXY() ?
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313 | conn->http_proxy.host.dispname : conn->host.dispname;
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314 |
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315 | /* Here, gtls.c gets the peer certificates and fails out depending on
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316 | * settings in "data." axTLS api doesn't have get cert chain fcn, so omit?
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317 | */
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318 |
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319 | /* Verify server's certificate */
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320 | if(SSL_CONN_CONFIG(verifypeer)) {
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321 | if(ssl_verify_cert(ssl) != SSL_OK) {
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322 | Curl_axtls_close(conn, sockindex);
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323 | failf(data, "server cert verify failed");
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324 | return CURLE_PEER_FAILED_VERIFICATION;
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325 | }
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326 | }
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327 | else
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328 | infof(data, "\t server certificate verification SKIPPED\n");
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329 |
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330 | /* Here, gtls.c does issuer verification. axTLS has no straightforward
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331 | * equivalent, so omitting for now.*/
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332 |
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333 | /* Here, gtls.c does the following
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334 | * 1) x509 hostname checking per RFC2818. axTLS doesn't support this, but
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335 | * it seems useful. This is now implemented, by Oscar Koeroo
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336 | * 2) checks cert validity based on time. axTLS does this in ssl_verify_cert
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337 | * 3) displays a bunch of cert information. axTLS doesn't support most of
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338 | * this, but a couple fields are available.
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339 | */
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340 |
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341 | /* There is no (DNS) Altnames count in the version 1.4.8 API. There is a
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342 | risk of an inifite loop */
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343 | for(dns_altname_index = 0; ; dns_altname_index++) {
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344 | dns_altname = ssl_get_cert_subject_alt_dnsname(ssl, dns_altname_index);
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345 | if(dns_altname == NULL) {
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346 | break;
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347 | }
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348 | found_subject_alt_names = 1;
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349 |
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350 | infof(data, "\tComparing subject alt name DNS with hostname: %s <-> %s\n",
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351 | dns_altname, hostname);
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352 | if(Curl_cert_hostcheck(dns_altname, hostname)) {
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353 | found_subject_alt_name_matching_conn = 1;
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354 | break;
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355 | }
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356 | }
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357 |
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358 | /* RFC2818 checks */
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359 | if(found_subject_alt_names && !found_subject_alt_name_matching_conn) {
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360 | if(SSL_CONN_CONFIG(verifyhost)) {
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361 | /* Break connection ! */
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362 | Curl_axtls_close(conn, sockindex);
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363 | failf(data, "\tsubjectAltName(s) do not match %s\n", dispname);
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364 | return CURLE_PEER_FAILED_VERIFICATION;
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365 | }
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366 | else
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367 | infof(data, "\tsubjectAltName(s) do not match %s\n", dispname);
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368 | }
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369 | else if(found_subject_alt_names == 0) {
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370 | /* Per RFC2818, when no Subject Alt Names were available, examine the peer
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371 | CN as a legacy fallback */
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372 | peer_CN = ssl_get_cert_dn(ssl, SSL_X509_CERT_COMMON_NAME);
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373 | if(peer_CN == NULL) {
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374 | if(SSL_CONN_CONFIG(verifyhost)) {
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375 | Curl_axtls_close(conn, sockindex);
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376 | failf(data, "unable to obtain common name from peer certificate");
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377 | return CURLE_PEER_FAILED_VERIFICATION;
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378 | }
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379 | else
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380 | infof(data, "unable to obtain common name from peer certificate");
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381 | }
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382 | else {
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383 | if(!Curl_cert_hostcheck((const char *)peer_CN, hostname)) {
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384 | if(SSL_CONN_CONFIG(verifyhost)) {
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385 | /* Break connection ! */
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386 | Curl_axtls_close(conn, sockindex);
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387 | failf(data, "\tcommon name \"%s\" does not match \"%s\"\n",
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388 | peer_CN, dispname);
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389 | return CURLE_PEER_FAILED_VERIFICATION;
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390 | }
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391 | else
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392 | infof(data, "\tcommon name \"%s\" does not match \"%s\"\n",
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393 | peer_CN, dispname);
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394 | }
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395 | }
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396 | }
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397 |
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398 | /* General housekeeping */
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399 | connssl->state = ssl_connection_complete;
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400 | conn->recv[sockindex] = axtls_recv;
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401 | conn->send[sockindex] = axtls_send;
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402 |
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403 | /* Put our freshly minted SSL session in cache */
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404 | if(SSL_SET_OPTION(primary.sessionid)) {
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405 | const uint8_t *ssl_sessionid = ssl_get_session_id(ssl);
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406 | size_t ssl_idsize = ssl_get_session_id_size(ssl);
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407 | Curl_ssl_sessionid_lock(conn);
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408 | if(Curl_ssl_addsessionid(conn, (void *) ssl_sessionid, ssl_idsize,
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409 | sockindex) != CURLE_OK)
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410 | infof(data, "failed to add session to cache\n");
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411 | Curl_ssl_sessionid_unlock(conn);
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412 | }
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413 |
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414 | return CURLE_OK;
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415 | }
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416 |
|
---|
417 | /*
|
---|
418 | * Use axTLS's non-blocking connection feature to open an SSL connection.
|
---|
419 | * This is called after a TCP connection is already established.
|
---|
420 | */
|
---|
421 | static CURLcode Curl_axtls_connect_nonblocking(struct connectdata *conn,
|
---|
422 | int sockindex, bool *done)
|
---|
423 | {
|
---|
424 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
425 | CURLcode conn_step;
|
---|
426 | int ssl_fcn_return;
|
---|
427 | int i;
|
---|
428 |
|
---|
429 | *done = FALSE;
|
---|
430 | /* connectdata is calloc'd and connecting_state is only changed in this
|
---|
431 | function, so this is safe, as the state is effectively initialized. */
|
---|
432 | if(connssl->connecting_state == ssl_connect_1) {
|
---|
433 | conn_step = connect_prep(conn, sockindex);
|
---|
434 | if(conn_step != CURLE_OK) {
|
---|
435 | Curl_axtls_close(conn, sockindex);
|
---|
436 | return conn_step;
|
---|
437 | }
|
---|
438 | connssl->connecting_state = ssl_connect_2;
|
---|
439 | }
|
---|
440 |
|
---|
441 | if(connssl->connecting_state == ssl_connect_2) {
|
---|
442 | /* Check to make sure handshake was ok. */
|
---|
443 | if(ssl_handshake_status(BACKEND->ssl) != SSL_OK) {
|
---|
444 | /* Loop to perform more work in between sleeps. This is work around the
|
---|
445 | fact that axtls does not expose any knowledge about when work needs
|
---|
446 | to be performed. This can save ~25% of time on SSL handshakes. */
|
---|
447 | for(i = 0; i<5; i++) {
|
---|
448 | ssl_fcn_return = ssl_read(BACKEND->ssl, NULL);
|
---|
449 | if(ssl_fcn_return < 0) {
|
---|
450 | Curl_axtls_close(conn, sockindex);
|
---|
451 | ssl_display_error(ssl_fcn_return); /* goes to stdout. */
|
---|
452 | return map_error_to_curl(ssl_fcn_return);
|
---|
453 | }
|
---|
454 | return CURLE_OK;
|
---|
455 | }
|
---|
456 | }
|
---|
457 | infof(conn->data, "handshake completed successfully\n");
|
---|
458 | connssl->connecting_state = ssl_connect_3;
|
---|
459 | }
|
---|
460 |
|
---|
461 | if(connssl->connecting_state == ssl_connect_3) {
|
---|
462 | conn_step = connect_finish(conn, sockindex);
|
---|
463 | if(conn_step != CURLE_OK) {
|
---|
464 | Curl_axtls_close(conn, sockindex);
|
---|
465 | return conn_step;
|
---|
466 | }
|
---|
467 |
|
---|
468 | /* Reset connect state */
|
---|
469 | connssl->connecting_state = ssl_connect_1;
|
---|
470 |
|
---|
471 | *done = TRUE;
|
---|
472 | return CURLE_OK;
|
---|
473 | }
|
---|
474 |
|
---|
475 | /* Unrecognized state. Things are very bad. */
|
---|
476 | connssl->state = ssl_connection_none;
|
---|
477 | connssl->connecting_state = ssl_connect_1;
|
---|
478 | /* Return value perhaps not strictly correct, but distinguishes the issue.*/
|
---|
479 | return CURLE_BAD_FUNCTION_ARGUMENT;
|
---|
480 | }
|
---|
481 |
|
---|
482 |
|
---|
483 | /*
|
---|
484 | * This function is called after the TCP connect has completed. Setup the TLS
|
---|
485 | * layer and do all necessary magic for a blocking connect.
|
---|
486 | */
|
---|
487 | static CURLcode Curl_axtls_connect(struct connectdata *conn, int sockindex)
|
---|
488 | {
|
---|
489 | struct Curl_easy *data = conn->data;
|
---|
490 | CURLcode conn_step = connect_prep(conn, sockindex);
|
---|
491 | int ssl_fcn_return;
|
---|
492 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
493 | SSL *ssl = BACKEND->ssl;
|
---|
494 | long timeout_ms;
|
---|
495 |
|
---|
496 | if(conn_step != CURLE_OK) {
|
---|
497 | Curl_axtls_close(conn, sockindex);
|
---|
498 | return conn_step;
|
---|
499 | }
|
---|
500 |
|
---|
501 | /* Check to make sure handshake was ok. */
|
---|
502 | while(ssl_handshake_status(ssl) != SSL_OK) {
|
---|
503 | /* check allowed time left */
|
---|
504 | timeout_ms = Curl_timeleft(data, NULL, TRUE);
|
---|
505 |
|
---|
506 | if(timeout_ms < 0) {
|
---|
507 | /* no need to continue if time already is up */
|
---|
508 | failf(data, "SSL connection timeout");
|
---|
509 | return CURLE_OPERATION_TIMEDOUT;
|
---|
510 | }
|
---|
511 |
|
---|
512 | ssl_fcn_return = ssl_read(ssl, NULL);
|
---|
513 | if(ssl_fcn_return < 0) {
|
---|
514 | Curl_axtls_close(conn, sockindex);
|
---|
515 | ssl_display_error(ssl_fcn_return); /* goes to stdout. */
|
---|
516 | return map_error_to_curl(ssl_fcn_return);
|
---|
517 | }
|
---|
518 | /* TODO: avoid polling */
|
---|
519 | Curl_wait_ms(10);
|
---|
520 | }
|
---|
521 | infof(conn->data, "handshake completed successfully\n");
|
---|
522 |
|
---|
523 | conn_step = connect_finish(conn, sockindex);
|
---|
524 | if(conn_step != CURLE_OK) {
|
---|
525 | Curl_axtls_close(conn, sockindex);
|
---|
526 | return conn_step;
|
---|
527 | }
|
---|
528 |
|
---|
529 | return CURLE_OK;
|
---|
530 | }
|
---|
531 |
|
---|
532 | /* return number of sent (non-SSL) bytes */
|
---|
533 | static ssize_t axtls_send(struct connectdata *conn,
|
---|
534 | int sockindex,
|
---|
535 | const void *mem,
|
---|
536 | size_t len,
|
---|
537 | CURLcode *err)
|
---|
538 | {
|
---|
539 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
540 | /* ssl_write() returns 'int' while write() and send() returns 'size_t' */
|
---|
541 | int rc = ssl_write(BACKEND->ssl, mem, (int)len);
|
---|
542 |
|
---|
543 | infof(conn->data, " axtls_send\n");
|
---|
544 |
|
---|
545 | if(rc < 0) {
|
---|
546 | *err = map_error_to_curl(rc);
|
---|
547 | rc = -1; /* generic error code for send failure */
|
---|
548 | }
|
---|
549 |
|
---|
550 | *err = CURLE_OK;
|
---|
551 | return rc;
|
---|
552 | }
|
---|
553 |
|
---|
554 | /*
|
---|
555 | * This function is called to shut down the SSL layer but keep the
|
---|
556 | * socket open (CCC - Clear Command Channel)
|
---|
557 | */
|
---|
558 | static int Curl_axtls_shutdown(struct connectdata *conn, int sockindex)
|
---|
559 | {
|
---|
560 | /* Outline taken from openssl.c since functions are in axTLS compat layer.
|
---|
561 | axTLS's error set is much smaller, so a lot of error-handling was removed.
|
---|
562 | */
|
---|
563 | int retval = 0;
|
---|
564 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
565 | struct Curl_easy *data = conn->data;
|
---|
566 | uint8_t *buf;
|
---|
567 | ssize_t nread;
|
---|
568 |
|
---|
569 | infof(conn->data, " Curl_axtls_shutdown\n");
|
---|
570 |
|
---|
571 | /* This has only been tested on the proftpd server, and the mod_tls code
|
---|
572 | sends a close notify alert without waiting for a close notify alert in
|
---|
573 | response. Thus we wait for a close notify alert from the server, but
|
---|
574 | we do not send one. Let's hope other servers do the same... */
|
---|
575 |
|
---|
576 | /* axTLS compat layer does nothing for SSL_shutdown, so we do nothing too
|
---|
577 | if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
|
---|
578 | (void)SSL_shutdown(BACKEND->ssl);
|
---|
579 | */
|
---|
580 |
|
---|
581 | if(BACKEND->ssl) {
|
---|
582 | int what = SOCKET_READABLE(conn->sock[sockindex], SSL_SHUTDOWN_TIMEOUT);
|
---|
583 | if(what > 0) {
|
---|
584 | /* Something to read, let's do it and hope that it is the close
|
---|
585 | notify alert from the server. buf is managed internally by
|
---|
586 | axTLS and will be released upon calling ssl_free via
|
---|
587 | free_ssl_structs. */
|
---|
588 | nread = (ssize_t)ssl_read(BACKEND->ssl, &buf);
|
---|
589 |
|
---|
590 | if(nread < SSL_OK) {
|
---|
591 | failf(data, "close notify alert not received during shutdown");
|
---|
592 | retval = -1;
|
---|
593 | }
|
---|
594 | }
|
---|
595 | else if(0 == what) {
|
---|
596 | /* timeout */
|
---|
597 | failf(data, "SSL shutdown timeout");
|
---|
598 | }
|
---|
599 | else {
|
---|
600 | /* anything that gets here is fatally bad */
|
---|
601 | failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
|
---|
602 | retval = -1;
|
---|
603 | }
|
---|
604 |
|
---|
605 | free_ssl_structs(connssl);
|
---|
606 | }
|
---|
607 | return retval;
|
---|
608 | }
|
---|
609 |
|
---|
610 | static ssize_t axtls_recv(struct connectdata *conn, /* connection data */
|
---|
611 | int num, /* socketindex */
|
---|
612 | char *buf, /* store read data here */
|
---|
613 | size_t buffersize, /* max amount to read */
|
---|
614 | CURLcode *err)
|
---|
615 | {
|
---|
616 | struct ssl_connect_data *connssl = &conn->ssl[num];
|
---|
617 | ssize_t ret = 0;
|
---|
618 | uint8_t *read_buf;
|
---|
619 |
|
---|
620 | infof(conn->data, " axtls_recv\n");
|
---|
621 |
|
---|
622 | *err = CURLE_OK;
|
---|
623 | if(connssl) {
|
---|
624 | ret = ssl_read(BACKEND->ssl, &read_buf);
|
---|
625 | if(ret > SSL_OK) {
|
---|
626 | /* ssl_read returns SSL_OK if there is more data to read, so if it is
|
---|
627 | larger, then all data has been read already. */
|
---|
628 | memcpy(buf, read_buf,
|
---|
629 | (size_t)ret > buffersize ? buffersize : (size_t)ret);
|
---|
630 | }
|
---|
631 | else if(ret == SSL_OK) {
|
---|
632 | /* more data to be read, signal caller to call again */
|
---|
633 | *err = CURLE_AGAIN;
|
---|
634 | ret = -1;
|
---|
635 | }
|
---|
636 | else if(ret == -3) {
|
---|
637 | /* With patched axTLS, SSL_CLOSE_NOTIFY=-3. Hard-coding until axTLS
|
---|
638 | team approves proposed fix. */
|
---|
639 | Curl_axtls_close(conn, num);
|
---|
640 | }
|
---|
641 | else {
|
---|
642 | failf(conn->data, "axTLS recv error (%d)", ret);
|
---|
643 | *err = map_error_to_curl((int) ret);
|
---|
644 | ret = -1;
|
---|
645 | }
|
---|
646 | }
|
---|
647 |
|
---|
648 | return ret;
|
---|
649 | }
|
---|
650 |
|
---|
651 | /*
|
---|
652 | * Return codes:
|
---|
653 | * 1 means the connection is still in place
|
---|
654 | * 0 means the connection has been closed
|
---|
655 | * -1 means the connection status is unknown
|
---|
656 | */
|
---|
657 | static int Curl_axtls_check_cxn(struct connectdata *conn)
|
---|
658 | {
|
---|
659 | /* openssl.c line:
|
---|
660 | rc = SSL_peek(conn->ssl[FIRSTSOCKET].backend->ssl, (void*)&buf, 1);
|
---|
661 | axTLS compat layer always returns the last argument, so connection is
|
---|
662 | always alive? */
|
---|
663 |
|
---|
664 | infof(conn->data, " Curl_axtls_check_cxn\n");
|
---|
665 | return 1; /* connection still in place */
|
---|
666 | }
|
---|
667 |
|
---|
668 | static void Curl_axtls_session_free(void *ptr)
|
---|
669 | {
|
---|
670 | (void)ptr;
|
---|
671 | /* free the ID */
|
---|
672 | /* both openssl.c and gtls.c do something here, but axTLS's OpenSSL
|
---|
673 | compatibility layer does nothing, so we do nothing too. */
|
---|
674 | }
|
---|
675 |
|
---|
676 | static size_t Curl_axtls_version(char *buffer, size_t size)
|
---|
677 | {
|
---|
678 | return snprintf(buffer, size, "axTLS/%s", ssl_version());
|
---|
679 | }
|
---|
680 |
|
---|
681 | static CURLcode Curl_axtls_random(struct Curl_easy *data,
|
---|
682 | unsigned char *entropy, size_t length)
|
---|
683 | {
|
---|
684 | static bool ssl_seeded = FALSE;
|
---|
685 | (void)data;
|
---|
686 | if(!ssl_seeded) {
|
---|
687 | ssl_seeded = TRUE;
|
---|
688 | /* Initialize the seed if not already done. This call is not exactly thread
|
---|
689 | * safe (and neither is the ssl_seeded check), but the worst effect of a
|
---|
690 | * race condition is that some global resources will leak. */
|
---|
691 | RNG_initialize();
|
---|
692 | }
|
---|
693 | get_random((int)length, entropy);
|
---|
694 | return CURLE_OK;
|
---|
695 | }
|
---|
696 |
|
---|
697 | static void *Curl_axtls_get_internals(struct ssl_connect_data *connssl,
|
---|
698 | CURLINFO info UNUSED_PARAM)
|
---|
699 | {
|
---|
700 | (void)info;
|
---|
701 | return BACKEND->ssl;
|
---|
702 | }
|
---|
703 |
|
---|
704 | const struct Curl_ssl Curl_ssl_axtls = {
|
---|
705 | { CURLSSLBACKEND_AXTLS, "axtls" }, /* info */
|
---|
706 |
|
---|
707 | 0, /* have_ca_path */
|
---|
708 | 0, /* have_certinfo */
|
---|
709 | 0, /* have_pinnedpubkey */
|
---|
710 | 0, /* have_ssl_ctx */
|
---|
711 | 0, /* support_https_proxy */
|
---|
712 |
|
---|
713 | sizeof(struct ssl_backend_data),
|
---|
714 |
|
---|
715 | /*
|
---|
716 | * axTLS has no global init. Everything is done through SSL and SSL_CTX
|
---|
717 | * structs stored in connectdata structure.
|
---|
718 | */
|
---|
719 | Curl_none_init, /* init */
|
---|
720 | /* axTLS has no global cleanup. */
|
---|
721 | Curl_none_cleanup, /* cleanup */
|
---|
722 | Curl_axtls_version, /* version */
|
---|
723 | Curl_axtls_check_cxn, /* check_cxn */
|
---|
724 | Curl_axtls_shutdown, /* shutdown */
|
---|
725 | Curl_none_data_pending, /* data_pending */
|
---|
726 | Curl_axtls_random, /* random */
|
---|
727 | Curl_none_cert_status_request, /* cert_status_request */
|
---|
728 | Curl_axtls_connect, /* connect */
|
---|
729 | Curl_axtls_connect_nonblocking, /* connect_nonblocking */
|
---|
730 | Curl_axtls_get_internals, /* get_internals */
|
---|
731 | Curl_axtls_close, /* close_one */
|
---|
732 | Curl_none_close_all, /* close_all */
|
---|
733 | Curl_axtls_session_free, /* session_free */
|
---|
734 | Curl_none_set_engine, /* set_engine */
|
---|
735 | Curl_none_set_engine_default, /* set_engine_default */
|
---|
736 | Curl_none_engines_list, /* engines_list */
|
---|
737 | Curl_none_false_start, /* false_start */
|
---|
738 | Curl_none_md5sum, /* md5sum */
|
---|
739 | NULL /* sha256sum */
|
---|
740 | };
|
---|
741 |
|
---|
742 | #endif /* USE_AXTLS */
|
---|