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 | #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
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26 |
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27 | #include "urldata.h"
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28 | #include "rawstr.h"
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29 | #include "curl_sasl.h"
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30 | #include "http_digest.h"
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31 | #include "curl_printf.h"
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32 |
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33 | /* The last #include files should be: */
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34 | #include "curl_memory.h"
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35 | #include "memdebug.h"
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36 |
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37 | /* Test example headers:
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38 |
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39 | WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
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40 | Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"
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41 |
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42 | */
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43 |
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44 | CURLcode Curl_input_digest(struct connectdata *conn,
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45 | bool proxy,
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46 | const char *header) /* rest of the *-authenticate:
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47 | header */
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48 | {
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49 | struct SessionHandle *data = conn->data;
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50 |
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51 | /* Point to the correct struct with this */
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52 | struct digestdata *digest;
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53 |
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54 | if(proxy) {
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55 | digest = &data->state.proxydigest;
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56 | }
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57 | else {
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58 | digest = &data->state.digest;
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59 | }
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60 |
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61 | if(!checkprefix("Digest", header))
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62 | return CURLE_BAD_CONTENT_ENCODING;
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63 |
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64 | header += strlen("Digest");
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65 | while(*header && ISSPACE(*header))
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66 | header++;
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67 |
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68 | return Curl_sasl_decode_digest_http_message(header, digest);
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69 | }
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70 |
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71 | CURLcode Curl_output_digest(struct connectdata *conn,
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72 | bool proxy,
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73 | const unsigned char *request,
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74 | const unsigned char *uripath)
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75 | {
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76 | CURLcode result;
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77 | struct SessionHandle *data = conn->data;
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78 | unsigned char *path;
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79 | char *tmp;
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80 | char *response;
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81 | size_t len;
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82 | bool have_chlg;
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83 |
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84 | /* Point to the address of the pointer that holds the string to send to the
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85 | server, which is for a plain host or for a HTTP proxy */
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86 | char **allocuserpwd;
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87 |
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88 | /* Point to the name and password for this */
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89 | const char *userp;
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90 | const char *passwdp;
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91 |
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92 | /* Point to the correct struct with this */
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93 | struct digestdata *digest;
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94 | struct auth *authp;
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95 |
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96 | if(proxy) {
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97 | digest = &data->state.proxydigest;
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98 | allocuserpwd = &conn->allocptr.proxyuserpwd;
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99 | userp = conn->proxyuser;
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100 | passwdp = conn->proxypasswd;
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101 | authp = &data->state.authproxy;
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102 | }
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103 | else {
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104 | digest = &data->state.digest;
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105 | allocuserpwd = &conn->allocptr.userpwd;
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106 | userp = conn->user;
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107 | passwdp = conn->passwd;
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108 | authp = &data->state.authhost;
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109 | }
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110 |
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111 | Curl_safefree(*allocuserpwd);
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112 |
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113 | /* not set means empty */
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114 | if(!userp)
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115 | userp = "";
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116 |
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117 | if(!passwdp)
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118 | passwdp = "";
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119 |
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120 | #if defined(USE_WINDOWS_SSPI)
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121 | have_chlg = digest->input_token ? TRUE : FALSE;
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122 | #else
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123 | have_chlg = digest->nonce ? TRUE : FALSE;
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124 | #endif
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125 |
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126 | if(!have_chlg) {
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127 | authp->done = FALSE;
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128 | return CURLE_OK;
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129 | }
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130 |
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131 | /* So IE browsers < v7 cut off the URI part at the query part when they
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132 | evaluate the MD5 and some (IIS?) servers work with them so we may need to
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133 | do the Digest IE-style. Note that the different ways cause different MD5
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134 | sums to get sent.
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135 |
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136 | Apache servers can be set to do the Digest IE-style automatically using
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137 | the BrowserMatch feature:
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138 | https://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie
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139 |
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140 | Further details on Digest implementation differences:
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141 | http://www.fngtps.com/2006/09/http-authentication
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142 | */
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143 |
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144 | if(authp->iestyle && ((tmp = strchr((char *)uripath, '?')) != NULL)) {
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145 | size_t urilen = tmp - (char *)uripath;
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146 |
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147 | path = (unsigned char *) aprintf("%.*s", urilen, uripath);
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148 | }
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149 | else
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150 | path = (unsigned char *) strdup((char *) uripath);
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151 |
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152 | if(!path)
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153 | return CURLE_OUT_OF_MEMORY;
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154 |
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155 | result = Curl_sasl_create_digest_http_message(data, userp, passwdp, request,
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156 | path, digest, &response, &len);
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157 | free(path);
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158 | if(result)
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159 | return result;
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160 |
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161 | *allocuserpwd = aprintf("%sAuthorization: Digest %s\r\n",
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162 | proxy ? "Proxy-" : "",
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163 | response);
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164 | free(response);
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165 | if(!*allocuserpwd)
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166 | return CURLE_OUT_OF_MEMORY;
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167 |
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168 | authp->done = TRUE;
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169 |
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170 | return CURLE_OK;
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171 | }
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172 |
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173 | void Curl_digest_cleanup(struct SessionHandle *data)
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174 | {
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175 | Curl_sasl_digest_cleanup(&data->state.digest);
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176 | Curl_sasl_digest_cleanup(&data->state.proxydigest);
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177 | }
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178 |
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179 | #endif
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