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) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | /* This file is for implementing all "generic" SSL functions that all libcurl
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24 | internals should use. It is then responsible for calling the proper
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25 | "backend" function.
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26 |
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27 | SSL-functions in libcurl should call functions in this source file, and not
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28 | to any specific SSL-layer.
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29 |
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30 | Curl_ssl_ - prefix for generic ones
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31 | Curl_ossl_ - prefix for OpenSSL ones
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32 | Curl_gtls_ - prefix for GnuTLS ones
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33 | Curl_nss_ - prefix for NSS ones
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34 | Curl_gskit_ - prefix for GSKit ones
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35 | Curl_polarssl_ - prefix for PolarSSL ones
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36 | Curl_cyassl_ - prefix for CyaSSL ones
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37 | Curl_schannel_ - prefix for Schannel SSPI ones
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38 | Curl_darwinssl_ - prefix for SecureTransport (Darwin) ones
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39 |
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40 | Note that this source code uses curlssl_* functions, and they are all
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41 | defines/macros #defined by the lib-specific header files.
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42 |
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43 | "SSL/TLS Strong Encryption: An Introduction"
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44 | https://httpd.apache.org/docs/2.0/ssl/ssl_intro.html
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45 | */
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46 |
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47 | #include "curl_setup.h"
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48 |
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49 | #ifdef HAVE_SYS_TYPES_H
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50 | #include <sys/types.h>
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51 | #endif
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52 | #ifdef HAVE_SYS_STAT_H
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53 | #include <sys/stat.h>
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54 | #endif
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55 | #ifdef HAVE_FCNTL_H
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56 | #include <fcntl.h>
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57 | #endif
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58 |
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59 | #include "urldata.h"
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60 |
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61 | #include "vtls.h" /* generic SSL protos etc */
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62 | #include "slist.h"
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63 | #include "sendf.h"
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64 | #include "rawstr.h"
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65 | #include "url.h"
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66 | #include "progress.h"
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67 | #include "share.h"
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68 | #include "timeval.h"
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69 | #include "curl_md5.h"
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70 | #include "warnless.h"
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71 | #include "curl_base64.h"
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72 | #include "curl_printf.h"
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73 |
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74 | /* The last #include files should be: */
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75 | #include "curl_memory.h"
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76 | #include "memdebug.h"
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77 |
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78 | /* convenience macro to check if this handle is using a shared SSL session */
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79 | #define SSLSESSION_SHARED(data) (data->share && \
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80 | (data->share->specifier & \
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81 | (1<<CURL_LOCK_DATA_SSL_SESSION)))
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82 |
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83 | static bool safe_strequal(char* str1, char* str2)
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84 | {
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85 | if(str1 && str2)
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86 | /* both pointers point to something then compare them */
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87 | return (0 != Curl_raw_equal(str1, str2)) ? TRUE : FALSE;
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88 | else
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89 | /* if both pointers are NULL then treat them as equal */
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90 | return (!str1 && !str2) ? TRUE : FALSE;
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91 | }
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92 |
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93 | bool
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94 | Curl_ssl_config_matches(struct ssl_config_data* data,
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95 | struct ssl_config_data* needle)
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96 | {
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97 | if((data->version == needle->version) &&
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98 | (data->verifypeer == needle->verifypeer) &&
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99 | (data->verifyhost == needle->verifyhost) &&
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100 | safe_strequal(data->CApath, needle->CApath) &&
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101 | safe_strequal(data->CAfile, needle->CAfile) &&
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102 | safe_strequal(data->random_file, needle->random_file) &&
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103 | safe_strequal(data->egdsocket, needle->egdsocket) &&
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104 | safe_strequal(data->cipher_list, needle->cipher_list))
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105 | return TRUE;
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106 |
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107 | return FALSE;
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108 | }
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109 |
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110 | bool
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111 | Curl_clone_ssl_config(struct ssl_config_data *source,
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112 | struct ssl_config_data *dest)
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113 | {
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114 | dest->sessionid = source->sessionid;
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115 | dest->verifyhost = source->verifyhost;
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116 | dest->verifypeer = source->verifypeer;
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117 | dest->version = source->version;
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118 |
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119 | if(source->CAfile) {
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120 | dest->CAfile = strdup(source->CAfile);
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121 | if(!dest->CAfile)
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122 | return FALSE;
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123 | }
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124 | else
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125 | dest->CAfile = NULL;
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126 |
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127 | if(source->CApath) {
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128 | dest->CApath = strdup(source->CApath);
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129 | if(!dest->CApath)
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130 | return FALSE;
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131 | }
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132 | else
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133 | dest->CApath = NULL;
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134 |
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135 | if(source->cipher_list) {
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136 | dest->cipher_list = strdup(source->cipher_list);
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137 | if(!dest->cipher_list)
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138 | return FALSE;
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139 | }
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140 | else
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141 | dest->cipher_list = NULL;
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142 |
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143 | if(source->egdsocket) {
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144 | dest->egdsocket = strdup(source->egdsocket);
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145 | if(!dest->egdsocket)
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146 | return FALSE;
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147 | }
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148 | else
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149 | dest->egdsocket = NULL;
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150 |
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151 | if(source->random_file) {
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152 | dest->random_file = strdup(source->random_file);
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153 | if(!dest->random_file)
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154 | return FALSE;
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155 | }
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156 | else
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157 | dest->random_file = NULL;
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158 |
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159 | return TRUE;
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160 | }
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161 |
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162 | void Curl_free_ssl_config(struct ssl_config_data* sslc)
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163 | {
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164 | Curl_safefree(sslc->CAfile);
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165 | Curl_safefree(sslc->CApath);
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166 | Curl_safefree(sslc->cipher_list);
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167 | Curl_safefree(sslc->egdsocket);
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168 | Curl_safefree(sslc->random_file);
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169 | }
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170 |
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171 |
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172 | /*
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173 | * Curl_rand() returns a random unsigned integer, 32bit.
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174 | *
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175 | * This non-SSL function is put here only because this file is the only one
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176 | * with knowledge of what the underlying SSL libraries provide in terms of
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177 | * randomizers.
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178 | *
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179 | * NOTE: 'data' may be passed in as NULL when coming from external API without
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180 | * easy handle!
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181 | *
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182 | */
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183 |
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184 | unsigned int Curl_rand(struct SessionHandle *data)
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185 | {
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186 | unsigned int r = 0;
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187 | static unsigned int randseed;
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188 | static bool seeded = FALSE;
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189 |
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190 | #ifdef CURLDEBUG
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191 | char *force_entropy = getenv("CURL_ENTROPY");
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192 | if(force_entropy) {
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193 | if(!seeded) {
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194 | size_t elen = strlen(force_entropy);
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195 | size_t clen = sizeof(randseed);
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196 | size_t min = elen < clen ? elen : clen;
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197 | memcpy((char *)&randseed, force_entropy, min);
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198 | seeded = TRUE;
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199 | }
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200 | else
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201 | randseed++;
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202 | return randseed;
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203 | }
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204 | #endif
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205 |
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206 | /* data may be NULL! */
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207 | if(!Curl_ssl_random(data, (unsigned char *)&r, sizeof(r)))
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208 | return r;
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209 |
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210 | /* If Curl_ssl_random() returns non-zero it couldn't offer randomness and we
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211 | instead perform a "best effort" */
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212 |
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213 | #ifdef RANDOM_FILE
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214 | if(!seeded) {
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215 | /* if there's a random file to read a seed from, use it */
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216 | int fd = open(RANDOM_FILE, O_RDONLY);
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217 | if(fd > -1) {
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218 | /* read random data into the randseed variable */
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219 | ssize_t nread = read(fd, &randseed, sizeof(randseed));
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220 | if(nread == sizeof(randseed))
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221 | seeded = TRUE;
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222 | close(fd);
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223 | }
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224 | }
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225 | #endif
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226 |
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227 | if(!seeded) {
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228 | struct timeval now = curlx_tvnow();
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229 | infof(data, "WARNING: Using weak random seed\n");
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230 | randseed += (unsigned int)now.tv_usec + (unsigned int)now.tv_sec;
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231 | randseed = randseed * 1103515245 + 12345;
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232 | randseed = randseed * 1103515245 + 12345;
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233 | randseed = randseed * 1103515245 + 12345;
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234 | seeded = TRUE;
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235 | }
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236 |
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237 | /* Return an unsigned 32-bit pseudo-random number. */
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238 | r = randseed = randseed * 1103515245 + 12345;
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239 | return (r << 16) | ((r >> 16) & 0xFFFF);
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240 | }
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241 |
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242 | int Curl_ssl_backend(void)
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243 | {
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244 | return (int)CURL_SSL_BACKEND;
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245 | }
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246 |
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247 | #ifdef USE_SSL
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248 |
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249 | /* "global" init done? */
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250 | static bool init_ssl=FALSE;
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251 |
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252 | /**
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253 | * Global SSL init
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254 | *
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255 | * @retval 0 error initializing SSL
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256 | * @retval 1 SSL initialized successfully
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257 | */
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258 | int Curl_ssl_init(void)
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259 | {
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260 | /* make sure this is only done once */
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261 | if(init_ssl)
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262 | return 1;
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263 | init_ssl = TRUE; /* never again */
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264 |
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265 | return curlssl_init();
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266 | }
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267 |
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268 |
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269 | /* Global cleanup */
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270 | void Curl_ssl_cleanup(void)
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271 | {
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272 | if(init_ssl) {
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273 | /* only cleanup if we did a previous init */
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274 | curlssl_cleanup();
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275 | init_ssl = FALSE;
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276 | }
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277 | }
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278 |
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279 | static bool ssl_prefs_check(struct SessionHandle *data)
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280 | {
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281 | /* check for CURLOPT_SSLVERSION invalid parameter value */
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282 | if((data->set.ssl.version < 0)
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283 | || (data->set.ssl.version >= CURL_SSLVERSION_LAST)) {
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284 | failf(data, "Unrecognized parameter value passed via CURLOPT_SSLVERSION");
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285 | return FALSE;
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286 | }
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287 | return TRUE;
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288 | }
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289 |
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290 | CURLcode
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291 | Curl_ssl_connect(struct connectdata *conn, int sockindex)
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292 | {
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293 | CURLcode result;
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294 |
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295 | if(!ssl_prefs_check(conn->data))
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296 | return CURLE_SSL_CONNECT_ERROR;
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297 |
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298 | /* mark this is being ssl-enabled from here on. */
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299 | conn->ssl[sockindex].use = TRUE;
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300 | conn->ssl[sockindex].state = ssl_connection_negotiating;
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301 |
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302 | result = curlssl_connect(conn, sockindex);
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303 |
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304 | if(!result)
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305 | Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
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306 |
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307 | return result;
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308 | }
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309 |
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310 | CURLcode
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311 | Curl_ssl_connect_nonblocking(struct connectdata *conn, int sockindex,
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312 | bool *done)
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313 | {
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314 | CURLcode result;
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315 |
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316 | if(!ssl_prefs_check(conn->data))
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317 | return CURLE_SSL_CONNECT_ERROR;
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318 |
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319 | /* mark this is being ssl requested from here on. */
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320 | conn->ssl[sockindex].use = TRUE;
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321 | #ifdef curlssl_connect_nonblocking
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322 | result = curlssl_connect_nonblocking(conn, sockindex, done);
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323 | #else
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324 | *done = TRUE; /* fallback to BLOCKING */
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325 | result = curlssl_connect(conn, sockindex);
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326 | #endif /* non-blocking connect support */
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327 | if(!result && *done)
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328 | Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
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329 | return result;
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330 | }
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331 |
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332 | /*
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333 | * Check if there's a session ID for the given connection in the cache, and if
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334 | * there's one suitable, it is provided. Returns TRUE when no entry matched.
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335 | */
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336 | bool Curl_ssl_getsessionid(struct connectdata *conn,
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337 | void **ssl_sessionid,
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338 | size_t *idsize) /* set 0 if unknown */
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339 | {
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340 | struct curl_ssl_session *check;
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341 | struct SessionHandle *data = conn->data;
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342 | size_t i;
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343 | long *general_age;
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344 | bool no_match = TRUE;
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345 |
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346 | *ssl_sessionid = NULL;
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347 |
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348 | if(!conn->ssl_config.sessionid)
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349 | /* session ID re-use is disabled */
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350 | return TRUE;
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351 |
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352 | /* Lock if shared */
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353 | if(SSLSESSION_SHARED(data)) {
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354 | Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
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355 | general_age = &data->share->sessionage;
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356 | }
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357 | else
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358 | general_age = &data->state.sessionage;
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359 |
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360 | for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) {
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361 | check = &data->state.session[i];
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362 | if(!check->sessionid)
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363 | /* not session ID means blank entry */
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364 | continue;
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365 | if(Curl_raw_equal(conn->host.name, check->name) &&
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366 | (conn->remote_port == check->remote_port) &&
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367 | Curl_ssl_config_matches(&conn->ssl_config, &check->ssl_config)) {
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368 | /* yes, we have a session ID! */
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369 | (*general_age)++; /* increase general age */
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370 | check->age = *general_age; /* set this as used in this age */
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371 | *ssl_sessionid = check->sessionid;
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372 | if(idsize)
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373 | *idsize = check->idsize;
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374 | no_match = FALSE;
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375 | break;
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376 | }
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377 | }
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378 |
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379 | /* Unlock */
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380 | if(SSLSESSION_SHARED(data))
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381 | Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION);
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382 |
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383 | return no_match;
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384 | }
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385 |
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386 | /*
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387 | * Kill a single session ID entry in the cache.
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388 | */
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389 | void Curl_ssl_kill_session(struct curl_ssl_session *session)
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390 | {
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391 | if(session->sessionid) {
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392 | /* defensive check */
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393 |
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394 | /* free the ID the SSL-layer specific way */
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395 | curlssl_session_free(session->sessionid);
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396 |
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397 | session->sessionid = NULL;
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398 | session->age = 0; /* fresh */
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399 |
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400 | Curl_free_ssl_config(&session->ssl_config);
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401 |
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402 | Curl_safefree(session->name);
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403 | }
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404 | }
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405 |
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406 | /*
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407 | * Delete the given session ID from the cache.
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408 | */
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409 | void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid)
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410 | {
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411 | size_t i;
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412 | struct SessionHandle *data=conn->data;
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413 |
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414 | if(SSLSESSION_SHARED(data))
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415 | Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
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416 |
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417 | for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) {
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418 | struct curl_ssl_session *check = &data->state.session[i];
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419 |
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420 | if(check->sessionid == ssl_sessionid) {
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421 | Curl_ssl_kill_session(check);
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422 | break;
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423 | }
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424 | }
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425 |
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426 | if(SSLSESSION_SHARED(data))
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427 | Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION);
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428 | }
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429 |
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430 | /*
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431 | * Store session id in the session cache. The ID passed on to this function
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432 | * must already have been extracted and allocated the proper way for the SSL
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433 | * layer. Curl_XXXX_session_free() will be called to free/kill the session ID
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434 | * later on.
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435 | */
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436 | CURLcode Curl_ssl_addsessionid(struct connectdata *conn,
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437 | void *ssl_sessionid,
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438 | size_t idsize)
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439 | {
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440 | size_t i;
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441 | struct SessionHandle *data=conn->data; /* the mother of all structs */
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442 | struct curl_ssl_session *store = &data->state.session[0];
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443 | long oldest_age=data->state.session[0].age; /* zero if unused */
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444 | char *clone_host;
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445 | long *general_age;
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446 |
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447 | /* Even though session ID re-use might be disabled, that only disables USING
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448 | IT. We still store it here in case the re-using is again enabled for an
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449 | upcoming transfer */
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450 |
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451 | clone_host = strdup(conn->host.name);
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452 | if(!clone_host)
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453 | return CURLE_OUT_OF_MEMORY; /* bail out */
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454 |
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455 | /* Now we should add the session ID and the host name to the cache, (remove
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456 | the oldest if necessary) */
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457 |
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458 | /* If using shared SSL session, lock! */
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459 | if(SSLSESSION_SHARED(data)) {
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460 | Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE);
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461 | general_age = &data->share->sessionage;
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462 | }
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463 | else {
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464 | general_age = &data->state.sessionage;
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465 | }
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466 |
|
---|
467 | /* find an empty slot for us, or find the oldest */
|
---|
468 | for(i = 1; (i < data->set.ssl.max_ssl_sessions) &&
|
---|
469 | data->state.session[i].sessionid; i++) {
|
---|
470 | if(data->state.session[i].age < oldest_age) {
|
---|
471 | oldest_age = data->state.session[i].age;
|
---|
472 | store = &data->state.session[i];
|
---|
473 | }
|
---|
474 | }
|
---|
475 | if(i == data->set.ssl.max_ssl_sessions)
|
---|
476 | /* cache is full, we must "kill" the oldest entry! */
|
---|
477 | Curl_ssl_kill_session(store);
|
---|
478 | else
|
---|
479 | store = &data->state.session[i]; /* use this slot */
|
---|
480 |
|
---|
481 | /* now init the session struct wisely */
|
---|
482 | store->sessionid = ssl_sessionid;
|
---|
483 | store->idsize = idsize;
|
---|
484 | store->age = *general_age; /* set current age */
|
---|
485 | /* free it if there's one already present */
|
---|
486 | free(store->name);
|
---|
487 | store->name = clone_host; /* clone host name */
|
---|
488 | store->remote_port = conn->remote_port; /* port number */
|
---|
489 |
|
---|
490 |
|
---|
491 | /* Unlock */
|
---|
492 | if(SSLSESSION_SHARED(data))
|
---|
493 | Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION);
|
---|
494 |
|
---|
495 | if(!Curl_clone_ssl_config(&conn->ssl_config, &store->ssl_config)) {
|
---|
496 | store->sessionid = NULL; /* let caller free sessionid */
|
---|
497 | free(clone_host);
|
---|
498 | return CURLE_OUT_OF_MEMORY;
|
---|
499 | }
|
---|
500 |
|
---|
501 | return CURLE_OK;
|
---|
502 | }
|
---|
503 |
|
---|
504 |
|
---|
505 | void Curl_ssl_close_all(struct SessionHandle *data)
|
---|
506 | {
|
---|
507 | size_t i;
|
---|
508 | /* kill the session ID cache if not shared */
|
---|
509 | if(data->state.session && !SSLSESSION_SHARED(data)) {
|
---|
510 | for(i = 0; i < data->set.ssl.max_ssl_sessions; i++)
|
---|
511 | /* the single-killer function handles empty table slots */
|
---|
512 | Curl_ssl_kill_session(&data->state.session[i]);
|
---|
513 |
|
---|
514 | /* free the cache data */
|
---|
515 | Curl_safefree(data->state.session);
|
---|
516 | }
|
---|
517 |
|
---|
518 | curlssl_close_all(data);
|
---|
519 | }
|
---|
520 |
|
---|
521 | void Curl_ssl_close(struct connectdata *conn, int sockindex)
|
---|
522 | {
|
---|
523 | DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
|
---|
524 | curlssl_close(conn, sockindex);
|
---|
525 | }
|
---|
526 |
|
---|
527 | CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex)
|
---|
528 | {
|
---|
529 | if(curlssl_shutdown(conn, sockindex))
|
---|
530 | return CURLE_SSL_SHUTDOWN_FAILED;
|
---|
531 |
|
---|
532 | conn->ssl[sockindex].use = FALSE; /* get back to ordinary socket usage */
|
---|
533 | conn->ssl[sockindex].state = ssl_connection_none;
|
---|
534 |
|
---|
535 | conn->recv[sockindex] = Curl_recv_plain;
|
---|
536 | conn->send[sockindex] = Curl_send_plain;
|
---|
537 |
|
---|
538 | return CURLE_OK;
|
---|
539 | }
|
---|
540 |
|
---|
541 | /* Selects an SSL crypto engine
|
---|
542 | */
|
---|
543 | CURLcode Curl_ssl_set_engine(struct SessionHandle *data, const char *engine)
|
---|
544 | {
|
---|
545 | return curlssl_set_engine(data, engine);
|
---|
546 | }
|
---|
547 |
|
---|
548 | /* Selects the default SSL crypto engine
|
---|
549 | */
|
---|
550 | CURLcode Curl_ssl_set_engine_default(struct SessionHandle *data)
|
---|
551 | {
|
---|
552 | return curlssl_set_engine_default(data);
|
---|
553 | }
|
---|
554 |
|
---|
555 | /* Return list of OpenSSL crypto engine names. */
|
---|
556 | struct curl_slist *Curl_ssl_engines_list(struct SessionHandle *data)
|
---|
557 | {
|
---|
558 | return curlssl_engines_list(data);
|
---|
559 | }
|
---|
560 |
|
---|
561 | /*
|
---|
562 | * This sets up a session ID cache to the specified size. Make sure this code
|
---|
563 | * is agnostic to what underlying SSL technology we use.
|
---|
564 | */
|
---|
565 | CURLcode Curl_ssl_initsessions(struct SessionHandle *data, size_t amount)
|
---|
566 | {
|
---|
567 | struct curl_ssl_session *session;
|
---|
568 |
|
---|
569 | if(data->state.session)
|
---|
570 | /* this is just a precaution to prevent multiple inits */
|
---|
571 | return CURLE_OK;
|
---|
572 |
|
---|
573 | session = calloc(amount, sizeof(struct curl_ssl_session));
|
---|
574 | if(!session)
|
---|
575 | return CURLE_OUT_OF_MEMORY;
|
---|
576 |
|
---|
577 | /* store the info in the SSL section */
|
---|
578 | data->set.ssl.max_ssl_sessions = amount;
|
---|
579 | data->state.session = session;
|
---|
580 | data->state.sessionage = 1; /* this is brand new */
|
---|
581 | return CURLE_OK;
|
---|
582 | }
|
---|
583 |
|
---|
584 | size_t Curl_ssl_version(char *buffer, size_t size)
|
---|
585 | {
|
---|
586 | return curlssl_version(buffer, size);
|
---|
587 | }
|
---|
588 |
|
---|
589 | /*
|
---|
590 | * This function tries to determine connection status.
|
---|
591 | *
|
---|
592 | * Return codes:
|
---|
593 | * 1 means the connection is still in place
|
---|
594 | * 0 means the connection has been closed
|
---|
595 | * -1 means the connection status is unknown
|
---|
596 | */
|
---|
597 | int Curl_ssl_check_cxn(struct connectdata *conn)
|
---|
598 | {
|
---|
599 | return curlssl_check_cxn(conn);
|
---|
600 | }
|
---|
601 |
|
---|
602 | bool Curl_ssl_data_pending(const struct connectdata *conn,
|
---|
603 | int connindex)
|
---|
604 | {
|
---|
605 | return curlssl_data_pending(conn, connindex);
|
---|
606 | }
|
---|
607 |
|
---|
608 | void Curl_ssl_free_certinfo(struct SessionHandle *data)
|
---|
609 | {
|
---|
610 | int i;
|
---|
611 | struct curl_certinfo *ci = &data->info.certs;
|
---|
612 |
|
---|
613 | if(ci->num_of_certs) {
|
---|
614 | /* free all individual lists used */
|
---|
615 | for(i=0; i<ci->num_of_certs; i++) {
|
---|
616 | curl_slist_free_all(ci->certinfo[i]);
|
---|
617 | ci->certinfo[i] = NULL;
|
---|
618 | }
|
---|
619 |
|
---|
620 | free(ci->certinfo); /* free the actual array too */
|
---|
621 | ci->certinfo = NULL;
|
---|
622 | ci->num_of_certs = 0;
|
---|
623 | }
|
---|
624 | }
|
---|
625 |
|
---|
626 | CURLcode Curl_ssl_init_certinfo(struct SessionHandle *data, int num)
|
---|
627 | {
|
---|
628 | struct curl_certinfo *ci = &data->info.certs;
|
---|
629 | struct curl_slist **table;
|
---|
630 |
|
---|
631 | /* Free any previous certificate information structures */
|
---|
632 | Curl_ssl_free_certinfo(data);
|
---|
633 |
|
---|
634 | /* Allocate the required certificate information structures */
|
---|
635 | table = calloc((size_t) num, sizeof(struct curl_slist *));
|
---|
636 | if(!table)
|
---|
637 | return CURLE_OUT_OF_MEMORY;
|
---|
638 |
|
---|
639 | ci->num_of_certs = num;
|
---|
640 | ci->certinfo = table;
|
---|
641 |
|
---|
642 | return CURLE_OK;
|
---|
643 | }
|
---|
644 |
|
---|
645 | /*
|
---|
646 | * 'value' is NOT a zero terminated string
|
---|
647 | */
|
---|
648 | CURLcode Curl_ssl_push_certinfo_len(struct SessionHandle *data,
|
---|
649 | int certnum,
|
---|
650 | const char *label,
|
---|
651 | const char *value,
|
---|
652 | size_t valuelen)
|
---|
653 | {
|
---|
654 | struct curl_certinfo * ci = &data->info.certs;
|
---|
655 | char * output;
|
---|
656 | struct curl_slist * nl;
|
---|
657 | CURLcode result = CURLE_OK;
|
---|
658 | size_t labellen = strlen(label);
|
---|
659 | size_t outlen = labellen + 1 + valuelen + 1; /* label:value\0 */
|
---|
660 |
|
---|
661 | output = malloc(outlen);
|
---|
662 | if(!output)
|
---|
663 | return CURLE_OUT_OF_MEMORY;
|
---|
664 |
|
---|
665 | /* sprintf the label and colon */
|
---|
666 | snprintf(output, outlen, "%s:", label);
|
---|
667 |
|
---|
668 | /* memcpy the value (it might not be zero terminated) */
|
---|
669 | memcpy(&output[labellen+1], value, valuelen);
|
---|
670 |
|
---|
671 | /* zero terminate the output */
|
---|
672 | output[labellen + 1 + valuelen] = 0;
|
---|
673 |
|
---|
674 | nl = Curl_slist_append_nodup(ci->certinfo[certnum], output);
|
---|
675 | if(!nl) {
|
---|
676 | free(output);
|
---|
677 | curl_slist_free_all(ci->certinfo[certnum]);
|
---|
678 | result = CURLE_OUT_OF_MEMORY;
|
---|
679 | }
|
---|
680 |
|
---|
681 | ci->certinfo[certnum] = nl;
|
---|
682 | return result;
|
---|
683 | }
|
---|
684 |
|
---|
685 | /*
|
---|
686 | * This is a convenience function for push_certinfo_len that takes a zero
|
---|
687 | * terminated value.
|
---|
688 | */
|
---|
689 | CURLcode Curl_ssl_push_certinfo(struct SessionHandle *data,
|
---|
690 | int certnum,
|
---|
691 | const char *label,
|
---|
692 | const char *value)
|
---|
693 | {
|
---|
694 | size_t valuelen = strlen(value);
|
---|
695 |
|
---|
696 | return Curl_ssl_push_certinfo_len(data, certnum, label, value, valuelen);
|
---|
697 | }
|
---|
698 |
|
---|
699 | int Curl_ssl_random(struct SessionHandle *data,
|
---|
700 | unsigned char *entropy,
|
---|
701 | size_t length)
|
---|
702 | {
|
---|
703 | return curlssl_random(data, entropy, length);
|
---|
704 | }
|
---|
705 |
|
---|
706 | /*
|
---|
707 | * Public key pem to der conversion
|
---|
708 | */
|
---|
709 |
|
---|
710 | static CURLcode pubkey_pem_to_der(const char *pem,
|
---|
711 | unsigned char **der, size_t *der_len)
|
---|
712 | {
|
---|
713 | char *stripped_pem, *begin_pos, *end_pos;
|
---|
714 | size_t pem_count, stripped_pem_count = 0, pem_len;
|
---|
715 | CURLcode result;
|
---|
716 |
|
---|
717 | /* if no pem, exit. */
|
---|
718 | if(!pem)
|
---|
719 | return CURLE_BAD_CONTENT_ENCODING;
|
---|
720 |
|
---|
721 | begin_pos = strstr(pem, "-----BEGIN PUBLIC KEY-----");
|
---|
722 | if(!begin_pos)
|
---|
723 | return CURLE_BAD_CONTENT_ENCODING;
|
---|
724 |
|
---|
725 | pem_count = begin_pos - pem;
|
---|
726 | /* Invalid if not at beginning AND not directly following \n */
|
---|
727 | if(0 != pem_count && '\n' != pem[pem_count - 1])
|
---|
728 | return CURLE_BAD_CONTENT_ENCODING;
|
---|
729 |
|
---|
730 | /* 26 is length of "-----BEGIN PUBLIC KEY-----" */
|
---|
731 | pem_count += 26;
|
---|
732 |
|
---|
733 | /* Invalid if not directly following \n */
|
---|
734 | end_pos = strstr(pem + pem_count, "\n-----END PUBLIC KEY-----");
|
---|
735 | if(!end_pos)
|
---|
736 | return CURLE_BAD_CONTENT_ENCODING;
|
---|
737 |
|
---|
738 | pem_len = end_pos - pem;
|
---|
739 |
|
---|
740 | stripped_pem = malloc(pem_len - pem_count + 1);
|
---|
741 | if(!stripped_pem)
|
---|
742 | return CURLE_OUT_OF_MEMORY;
|
---|
743 |
|
---|
744 | /*
|
---|
745 | * Here we loop through the pem array one character at a time between the
|
---|
746 | * correct indices, and place each character that is not '\n' or '\r'
|
---|
747 | * into the stripped_pem array, which should represent the raw base64 string
|
---|
748 | */
|
---|
749 | while(pem_count < pem_len) {
|
---|
750 | if('\n' != pem[pem_count] && '\r' != pem[pem_count])
|
---|
751 | stripped_pem[stripped_pem_count++] = pem[pem_count];
|
---|
752 | ++pem_count;
|
---|
753 | }
|
---|
754 | /* Place the null terminator in the correct place */
|
---|
755 | stripped_pem[stripped_pem_count] = '\0';
|
---|
756 |
|
---|
757 | result = Curl_base64_decode(stripped_pem, der, der_len);
|
---|
758 |
|
---|
759 | Curl_safefree(stripped_pem);
|
---|
760 |
|
---|
761 | return result;
|
---|
762 | }
|
---|
763 |
|
---|
764 | /*
|
---|
765 | * Generic pinned public key check.
|
---|
766 | */
|
---|
767 |
|
---|
768 | CURLcode Curl_pin_peer_pubkey(struct SessionHandle *data,
|
---|
769 | const char *pinnedpubkey,
|
---|
770 | const unsigned char *pubkey, size_t pubkeylen)
|
---|
771 | {
|
---|
772 | FILE *fp;
|
---|
773 | unsigned char *buf = NULL, *pem_ptr = NULL;
|
---|
774 | long filesize;
|
---|
775 | size_t size, pem_len;
|
---|
776 | CURLcode pem_read;
|
---|
777 | CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
|
---|
778 | #ifdef curlssl_sha256sum
|
---|
779 | CURLcode encode;
|
---|
780 | size_t encodedlen, pinkeylen;
|
---|
781 | char *encoded, *pinkeycopy, *begin_pos, *end_pos;
|
---|
782 | unsigned char *sha256sumdigest = NULL;
|
---|
783 | #endif
|
---|
784 |
|
---|
785 | /* if a path wasn't specified, don't pin */
|
---|
786 | if(!pinnedpubkey)
|
---|
787 | return CURLE_OK;
|
---|
788 | if(!pubkey || !pubkeylen)
|
---|
789 | return result;
|
---|
790 |
|
---|
791 | #ifdef curlssl_sha256sum
|
---|
792 | /* only do this if pinnedpubkey starts with "sha256//", length 8 */
|
---|
793 | if(strncmp(pinnedpubkey, "sha256//", 8) == 0) {
|
---|
794 | /* compute sha256sum of public key */
|
---|
795 | sha256sumdigest = malloc(SHA256_DIGEST_LENGTH);
|
---|
796 | if(!sha256sumdigest)
|
---|
797 | return CURLE_OUT_OF_MEMORY;
|
---|
798 | curlssl_sha256sum(pubkey, pubkeylen,
|
---|
799 | sha256sumdigest, SHA256_DIGEST_LENGTH);
|
---|
800 | encode = Curl_base64_encode(data, (char *)sha256sumdigest,
|
---|
801 | SHA256_DIGEST_LENGTH, &encoded, &encodedlen);
|
---|
802 | Curl_safefree(sha256sumdigest);
|
---|
803 |
|
---|
804 | if(encode)
|
---|
805 | return encode;
|
---|
806 |
|
---|
807 | infof(data, "\t public key hash: sha256//%s\n", encoded);
|
---|
808 |
|
---|
809 | /* it starts with sha256//, copy so we can modify it */
|
---|
810 | pinkeylen = strlen(pinnedpubkey) + 1;
|
---|
811 | pinkeycopy = malloc(pinkeylen);
|
---|
812 | if(!pinkeycopy) {
|
---|
813 | Curl_safefree(encoded);
|
---|
814 | return CURLE_OUT_OF_MEMORY;
|
---|
815 | }
|
---|
816 | memcpy(pinkeycopy, pinnedpubkey, pinkeylen);
|
---|
817 | /* point begin_pos to the copy, and start extracting keys */
|
---|
818 | begin_pos = pinkeycopy;
|
---|
819 | do {
|
---|
820 | end_pos = strstr(begin_pos, ";sha256//");
|
---|
821 | /*
|
---|
822 | * if there is an end_pos, null terminate,
|
---|
823 | * otherwise it'll go to the end of the original string
|
---|
824 | */
|
---|
825 | if(end_pos)
|
---|
826 | end_pos[0] = '\0';
|
---|
827 |
|
---|
828 | /* compare base64 sha256 digests, 8 is the length of "sha256//" */
|
---|
829 | if(encodedlen == strlen(begin_pos + 8) &&
|
---|
830 | !memcmp(encoded, begin_pos + 8, encodedlen)) {
|
---|
831 | result = CURLE_OK;
|
---|
832 | break;
|
---|
833 | }
|
---|
834 |
|
---|
835 | /*
|
---|
836 | * change back the null-terminator we changed earlier,
|
---|
837 | * and look for next begin
|
---|
838 | */
|
---|
839 | if(end_pos) {
|
---|
840 | end_pos[0] = ';';
|
---|
841 | begin_pos = strstr(end_pos, "sha256//");
|
---|
842 | }
|
---|
843 | } while(end_pos && begin_pos);
|
---|
844 | Curl_safefree(encoded);
|
---|
845 | Curl_safefree(pinkeycopy);
|
---|
846 | return result;
|
---|
847 | }
|
---|
848 | #else
|
---|
849 | (void)data;
|
---|
850 | #endif
|
---|
851 |
|
---|
852 | fp = fopen(pinnedpubkey, "rb");
|
---|
853 | if(!fp)
|
---|
854 | return result;
|
---|
855 |
|
---|
856 | do {
|
---|
857 | /* Determine the file's size */
|
---|
858 | if(fseek(fp, 0, SEEK_END))
|
---|
859 | break;
|
---|
860 | filesize = ftell(fp);
|
---|
861 | if(fseek(fp, 0, SEEK_SET))
|
---|
862 | break;
|
---|
863 | if(filesize < 0 || filesize > MAX_PINNED_PUBKEY_SIZE)
|
---|
864 | break;
|
---|
865 |
|
---|
866 | /*
|
---|
867 | * if the size of our certificate is bigger than the file
|
---|
868 | * size then it can't match
|
---|
869 | */
|
---|
870 | size = curlx_sotouz((curl_off_t) filesize);
|
---|
871 | if(pubkeylen > size)
|
---|
872 | break;
|
---|
873 |
|
---|
874 | /*
|
---|
875 | * Allocate buffer for the pinned key
|
---|
876 | * With 1 additional byte for null terminator in case of PEM key
|
---|
877 | */
|
---|
878 | buf = malloc(size + 1);
|
---|
879 | if(!buf)
|
---|
880 | break;
|
---|
881 |
|
---|
882 | /* Returns number of elements read, which should be 1 */
|
---|
883 | if((int) fread(buf, size, 1, fp) != 1)
|
---|
884 | break;
|
---|
885 |
|
---|
886 | /* If the sizes are the same, it can't be base64 encoded, must be der */
|
---|
887 | if(pubkeylen == size) {
|
---|
888 | if(!memcmp(pubkey, buf, pubkeylen))
|
---|
889 | result = CURLE_OK;
|
---|
890 | break;
|
---|
891 | }
|
---|
892 |
|
---|
893 | /*
|
---|
894 | * Otherwise we will assume it's PEM and try to decode it
|
---|
895 | * after placing null terminator
|
---|
896 | */
|
---|
897 | buf[size] = '\0';
|
---|
898 | pem_read = pubkey_pem_to_der((const char *)buf, &pem_ptr, &pem_len);
|
---|
899 | /* if it wasn't read successfully, exit */
|
---|
900 | if(pem_read)
|
---|
901 | break;
|
---|
902 |
|
---|
903 | /*
|
---|
904 | * if the size of our certificate doesn't match the size of
|
---|
905 | * the decoded file, they can't be the same, otherwise compare
|
---|
906 | */
|
---|
907 | if(pubkeylen == pem_len && !memcmp(pubkey, pem_ptr, pubkeylen))
|
---|
908 | result = CURLE_OK;
|
---|
909 | } while(0);
|
---|
910 |
|
---|
911 | Curl_safefree(buf);
|
---|
912 | Curl_safefree(pem_ptr);
|
---|
913 | fclose(fp);
|
---|
914 |
|
---|
915 | return result;
|
---|
916 | }
|
---|
917 |
|
---|
918 | #ifndef CURL_DISABLE_CRYPTO_AUTH
|
---|
919 | CURLcode Curl_ssl_md5sum(unsigned char *tmp, /* input */
|
---|
920 | size_t tmplen,
|
---|
921 | unsigned char *md5sum, /* output */
|
---|
922 | size_t md5len)
|
---|
923 | {
|
---|
924 | #ifdef curlssl_md5sum
|
---|
925 | curlssl_md5sum(tmp, tmplen, md5sum, md5len);
|
---|
926 | #else
|
---|
927 | MD5_context *MD5pw;
|
---|
928 |
|
---|
929 | (void) md5len;
|
---|
930 |
|
---|
931 | MD5pw = Curl_MD5_init(Curl_DIGEST_MD5);
|
---|
932 | if(!MD5pw)
|
---|
933 | return CURLE_OUT_OF_MEMORY;
|
---|
934 | Curl_MD5_update(MD5pw, tmp, curlx_uztoui(tmplen));
|
---|
935 | Curl_MD5_final(MD5pw, md5sum);
|
---|
936 | #endif
|
---|
937 | return CURLE_OK;
|
---|
938 | }
|
---|
939 | #endif
|
---|
940 |
|
---|
941 | /*
|
---|
942 | * Check whether the SSL backend supports the status_request extension.
|
---|
943 | */
|
---|
944 | bool Curl_ssl_cert_status_request(void)
|
---|
945 | {
|
---|
946 | #ifdef curlssl_cert_status_request
|
---|
947 | return curlssl_cert_status_request();
|
---|
948 | #else
|
---|
949 | return FALSE;
|
---|
950 | #endif
|
---|
951 | }
|
---|
952 |
|
---|
953 | /*
|
---|
954 | * Check whether the SSL backend supports false start.
|
---|
955 | */
|
---|
956 | bool Curl_ssl_false_start(void)
|
---|
957 | {
|
---|
958 | #ifdef curlssl_false_start
|
---|
959 | return curlssl_false_start();
|
---|
960 | #else
|
---|
961 | return FALSE;
|
---|
962 | #endif
|
---|
963 | }
|
---|
964 |
|
---|
965 | #endif /* USE_SSL */
|
---|