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 | #include "curl_setup.h"
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24 |
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25 | #ifdef USE_WINDOWS_SSPI
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26 |
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27 | #if !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
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28 |
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29 | #include "urldata.h"
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30 | #include "sendf.h"
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31 | #include "rawstr.h"
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32 | #include "warnless.h"
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33 | #include "curl_base64.h"
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34 | #include "curl_sasl.h"
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35 | #include "http_negotiate.h"
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36 | #include "curl_multibyte.h"
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37 | #include "curl_printf.h"
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38 |
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39 | /* The last #include files should be: */
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40 | #include "curl_memory.h"
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41 | #include "memdebug.h"
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42 |
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43 | CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
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44 | const char *header)
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45 | {
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46 | struct SessionHandle *data = conn->data;
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47 | BYTE *input_token = NULL;
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48 | SecBufferDesc out_buff_desc;
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49 | SecBuffer out_sec_buff;
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50 | SecBufferDesc in_buff_desc;
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51 | SecBuffer in_sec_buff;
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52 | SECURITY_STATUS status;
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53 | unsigned long attrs;
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54 | TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
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55 | size_t len = 0, input_token_len = 0;
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56 | CURLcode result;
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57 |
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58 | /* Point to the username and password */
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59 | const char *userp;
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60 | const char *passwdp;
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61 |
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62 | /* Point to the correct struct with this */
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63 | struct negotiatedata *neg_ctx;
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64 |
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65 | if(proxy) {
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66 | userp = conn->proxyuser;
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67 | passwdp = conn->proxypasswd;
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68 | neg_ctx = &data->state.proxyneg;
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69 | }
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70 | else {
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71 | userp = conn->user;
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72 | passwdp = conn->passwd;
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73 | neg_ctx = &data->state.negotiate;
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74 | }
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75 |
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76 | /* Not set means empty */
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77 | if(!userp)
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78 | userp = "";
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79 |
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80 | if(!passwdp)
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81 | passwdp = "";
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82 |
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83 | if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
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84 | /* We finished successfully our part of authentication, but server
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85 | * rejected it (since we're again here). Exit with an error since we
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86 | * can't invent anything better */
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87 | Curl_cleanup_negotiate(data);
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88 | return CURLE_LOGIN_DENIED;
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89 | }
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90 |
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91 | if(!neg_ctx->server_name) {
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92 | /* Check proxy auth requested but no given proxy name */
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93 | if(proxy && !conn->proxy.name)
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94 | return CURLE_BAD_FUNCTION_ARGUMENT;
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95 |
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96 | /* Generate our SPN */
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97 | neg_ctx->server_name = Curl_sasl_build_spn(
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98 | proxy ? data->set.str[STRING_PROXY_SERVICE_NAME] :
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99 | data->set.str[STRING_SERVICE_NAME],
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100 | proxy ? conn->proxy.name : conn->host.name);
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101 | if(!neg_ctx->server_name)
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102 | return CURLE_OUT_OF_MEMORY;
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103 | }
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104 |
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105 | if(!neg_ctx->output_token) {
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106 | PSecPkgInfo SecurityPackage;
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107 | status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
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108 | TEXT(SP_NAME_NEGOTIATE),
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109 | &SecurityPackage);
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110 | if(status != SEC_E_OK)
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111 | return CURLE_NOT_BUILT_IN;
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112 |
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113 | /* Allocate input and output buffers according to the max token size
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114 | as indicated by the security package */
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115 | neg_ctx->token_max = SecurityPackage->cbMaxToken;
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116 | neg_ctx->output_token = malloc(neg_ctx->token_max);
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117 | s_pSecFn->FreeContextBuffer(SecurityPackage);
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118 | }
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119 |
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120 | /* Obtain the input token, if any */
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121 | header += strlen("Negotiate");
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122 | while(*header && ISSPACE(*header))
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123 | header++;
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124 |
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125 | len = strlen(header);
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126 | if(!len) {
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127 | /* Is this the first call in a new negotiation? */
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128 | if(neg_ctx->context) {
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129 | /* The server rejected our authentication and hasn't suppled any more
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130 | negotiation mechanisms */
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131 | return CURLE_LOGIN_DENIED;
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132 | }
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133 |
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134 | /* We have to acquire credentials and allocate memory for the context */
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135 | neg_ctx->credentials = malloc(sizeof(CredHandle));
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136 | neg_ctx->context = malloc(sizeof(CtxtHandle));
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137 |
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138 | if(!neg_ctx->credentials || !neg_ctx->context)
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139 | return CURLE_OUT_OF_MEMORY;
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140 |
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141 | if(userp && *userp) {
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142 | /* Populate our identity structure */
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143 | result = Curl_create_sspi_identity(userp, passwdp, &neg_ctx->identity);
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144 | if(result)
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145 | return result;
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146 |
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147 | /* Allow proper cleanup of the identity structure */
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148 | neg_ctx->p_identity = &neg_ctx->identity;
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149 | }
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150 | else
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151 | /* Use the current Windows user */
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152 | neg_ctx->p_identity = NULL;
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153 |
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154 | /* Acquire our credientials handle */
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155 | neg_ctx->status =
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156 | s_pSecFn->AcquireCredentialsHandle(NULL,
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157 | (TCHAR *) TEXT(SP_NAME_NEGOTIATE),
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158 | SECPKG_CRED_OUTBOUND, NULL,
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159 | neg_ctx->p_identity, NULL, NULL,
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160 | neg_ctx->credentials, &expiry);
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161 | if(neg_ctx->status != SEC_E_OK)
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162 | return CURLE_LOGIN_DENIED;
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163 | }
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164 | else {
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165 | result = Curl_base64_decode(header,
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166 | (unsigned char **)&input_token,
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167 | &input_token_len);
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168 | if(result)
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169 | return result;
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170 |
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171 | if(!input_token_len) {
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172 | infof(data,
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173 | "Negotiate handshake failure (empty challenge message)\n");
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174 |
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175 | return CURLE_BAD_CONTENT_ENCODING;
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176 | }
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177 | }
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178 |
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179 | /* Setup the "output" security buffer */
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180 | out_buff_desc.ulVersion = SECBUFFER_VERSION;
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181 | out_buff_desc.cBuffers = 1;
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182 | out_buff_desc.pBuffers = &out_sec_buff;
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183 | out_sec_buff.BufferType = SECBUFFER_TOKEN;
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184 | out_sec_buff.pvBuffer = neg_ctx->output_token;
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185 | out_sec_buff.cbBuffer = curlx_uztoul(neg_ctx->token_max);
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186 |
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187 | /* Setup the "input" security buffer if present */
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188 | if(input_token) {
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189 | in_buff_desc.ulVersion = SECBUFFER_VERSION;
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190 | in_buff_desc.cBuffers = 1;
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191 | in_buff_desc.pBuffers = &in_sec_buff;
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192 | in_sec_buff.BufferType = SECBUFFER_TOKEN;
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193 | in_sec_buff.pvBuffer = input_token;
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194 | in_sec_buff.cbBuffer = curlx_uztoul(input_token_len);
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195 | }
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196 |
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197 | /* Generate our message */
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198 | neg_ctx->status = s_pSecFn->InitializeSecurityContext(
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199 | neg_ctx->credentials,
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200 | input_token ? neg_ctx->context : NULL,
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201 | neg_ctx->server_name,
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202 | ISC_REQ_CONFIDENTIALITY,
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203 | 0,
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204 | SECURITY_NATIVE_DREP,
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205 | input_token ? &in_buff_desc : NULL,
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206 | 0,
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207 | neg_ctx->context,
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208 | &out_buff_desc,
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209 | &attrs,
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210 | &expiry);
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211 |
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212 | free(input_token);
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213 |
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214 | if(GSS_ERROR(neg_ctx->status))
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215 | return CURLE_OUT_OF_MEMORY;
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216 |
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217 | if(neg_ctx->status == SEC_I_COMPLETE_NEEDED ||
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218 | neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE) {
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219 | neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context,
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220 | &out_buff_desc);
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221 | if(GSS_ERROR(neg_ctx->status))
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222 | return CURLE_RECV_ERROR;
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223 | }
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224 |
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225 | neg_ctx->output_token_length = out_sec_buff.cbBuffer;
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226 |
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227 | return CURLE_OK;
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228 | }
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229 |
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230 | CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
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231 | {
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232 | struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
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233 | &conn->data->state.negotiate;
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234 | char *encoded = NULL;
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235 | size_t len = 0;
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236 | char *userp;
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237 | CURLcode error;
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238 |
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239 | error = Curl_base64_encode(conn->data,
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240 | (const char*)neg_ctx->output_token,
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241 | neg_ctx->output_token_length,
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242 | &encoded, &len);
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243 | if(error)
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244 | return error;
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245 |
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246 | if(!len)
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247 | return CURLE_REMOTE_ACCESS_DENIED;
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248 |
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249 | userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
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250 | encoded);
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251 |
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252 | if(proxy) {
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253 | Curl_safefree(conn->allocptr.proxyuserpwd);
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254 | conn->allocptr.proxyuserpwd = userp;
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255 | }
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256 | else {
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257 | Curl_safefree(conn->allocptr.userpwd);
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258 | conn->allocptr.userpwd = userp;
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259 | }
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260 | free(encoded);
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261 | return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
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262 | }
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263 |
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264 | static void cleanup(struct negotiatedata *neg_ctx)
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265 | {
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266 | /* Free our security context */
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267 | if(neg_ctx->context) {
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268 | s_pSecFn->DeleteSecurityContext(neg_ctx->context);
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269 | free(neg_ctx->context);
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270 | neg_ctx->context = NULL;
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271 | }
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272 |
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273 | /* Free our credentials handle */
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274 | if(neg_ctx->credentials) {
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275 | s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
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276 | free(neg_ctx->credentials);
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277 | neg_ctx->credentials = NULL;
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278 | }
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279 |
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280 | /* Free our identity */
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281 | Curl_sspi_free_identity(neg_ctx->p_identity);
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282 | neg_ctx->p_identity = NULL;
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283 |
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284 | /* Free the SPN and output token */
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285 | Curl_safefree(neg_ctx->server_name);
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286 | Curl_safefree(neg_ctx->output_token);
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287 |
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288 | /* Reset any variables */
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289 | neg_ctx->token_max = 0;
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290 | }
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291 |
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292 | void Curl_cleanup_negotiate(struct SessionHandle *data)
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293 | {
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294 | cleanup(&data->state.negotiate);
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295 | cleanup(&data->state.proxyneg);
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296 | }
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297 |
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298 | #endif /* !CURL_DISABLE_HTTP && USE_SPNEGO */
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299 |
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300 | #endif /* USE_WINDOWS_SSPI */
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