1 | /***************************************************************************\ |
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2 | * * |
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3 | * BitlBee - An IRC to IM gateway * |
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4 | * Simple OAuth2 client (consumer) implementation. * |
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5 | * * |
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6 | * Copyright 2010-2013 Wilmer van der Gaast <wilmer@gaast.net> * |
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7 | * * |
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8 | * This program is free software; you can redistribute it and/or modify * |
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9 | * it under the terms of the GNU General Public License as published by * |
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10 | * the Free Software Foundation; either version 2 of the License, or * |
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11 | * (at your option) any later version. * |
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12 | * * |
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13 | * This program is distributed in the hope that it will be useful, * |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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16 | * GNU General Public License for more details. * |
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17 | * * |
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18 | * You should have received a copy of the GNU General Public License along * |
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19 | * with this program; if not, write to the Free Software Foundation, Inc., * |
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20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * |
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21 | * * |
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22 | \***************************************************************************/ |
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23 | |
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24 | /* Out of protest, I should rename this file. OAuth2 is a pathetic joke, and |
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25 | of all things, DEFINITELY NOT A STANDARD. The only thing various OAuth2 |
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26 | implementations have in common is that name, wrongfully stolen from |
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27 | a pretty nice standard called OAuth 1.0a. That, and the fact that they |
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28 | use JSON. Wait, no, Facebook's version doesn't use JSON. For some of its |
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29 | responses. |
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30 | |
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31 | Apparently too many people were too retarded to comprehend the elementary |
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32 | bits of crypto in OAuth 1.0a (took me one afternoon to implement) so |
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33 | the standard was replaced with what comes down to a complicated scheme |
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34 | around what's really just application-specific passwords. |
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35 | |
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36 | And then a bunch of mostly incompatible implementations. Great work, guys. |
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37 | |
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38 | http://hueniverse.com/2012/07/oauth-2-0-and-the-road-to-hell/ */ |
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39 | |
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40 | #include <glib.h> |
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41 | #include "http_client.h" |
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42 | #include "oauth2.h" |
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43 | #include "oauth.h" |
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44 | #include "json.h" |
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45 | #include "json_util.h" |
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46 | #include "url.h" |
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47 | |
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48 | char *oauth2_url( const struct oauth2_service *sp ) |
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49 | { |
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50 | return g_strconcat( sp->auth_url, |
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51 | "?scope=", sp->scope, |
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52 | "&response_type=code" |
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53 | "&redirect_uri=", sp->redirect_url, |
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54 | "&client_id=", sp->consumer_key, |
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55 | NULL ); |
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56 | } |
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57 | |
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58 | struct oauth2_access_token_data |
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59 | { |
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60 | oauth2_token_callback func; |
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61 | gpointer data; |
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62 | }; |
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63 | |
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64 | static void oauth2_access_token_done( struct http_request *req ); |
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65 | |
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66 | int oauth2_access_token( const struct oauth2_service *sp, |
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67 | const char *auth_type, const char *auth, |
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68 | oauth2_token_callback func, gpointer data ) |
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69 | { |
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70 | GSList *args = NULL; |
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71 | char *args_s, *s; |
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72 | url_t url_p; |
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73 | struct http_request *req; |
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74 | struct oauth2_access_token_data *cb_data; |
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75 | |
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76 | if( !url_set( &url_p, sp->token_url ) ) |
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77 | return 0; |
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78 | |
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79 | oauth_params_add( &args, "client_id", sp->consumer_key ); |
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80 | oauth_params_add( &args, "client_secret", sp->consumer_secret ); |
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81 | oauth_params_add( &args, "grant_type", auth_type ); |
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82 | if( strcmp( auth_type, OAUTH2_AUTH_CODE ) == 0 ) |
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83 | { |
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84 | oauth_params_add( &args, "redirect_uri", sp->redirect_url ); |
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85 | oauth_params_add( &args, "code", auth ); |
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86 | } |
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87 | else |
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88 | { |
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89 | oauth_params_add( &args, "refresh_token", auth ); |
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90 | } |
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91 | args_s = oauth_params_string( args ); |
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92 | oauth_params_free( &args ); |
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93 | |
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94 | s = g_strdup_printf( "POST %s HTTP/1.0\r\n" |
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95 | "Host: %s\r\n" |
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96 | "Content-Type: application/x-www-form-urlencoded\r\n" |
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97 | "Content-Length: %zd\r\n" |
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98 | "\r\n" |
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99 | "%s", url_p.file, url_p.host, strlen( args_s ), args_s ); |
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100 | g_free( args_s ); |
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101 | |
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102 | cb_data = g_new0( struct oauth2_access_token_data, 1 ); |
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103 | cb_data->func = func; |
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104 | cb_data->data = data; |
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105 | |
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106 | req = http_dorequest( url_p.host, url_p.port, url_p.proto == PROTO_HTTPS, |
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107 | s, oauth2_access_token_done, cb_data ); |
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108 | |
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109 | g_free( s ); |
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110 | |
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111 | if( req == NULL ) |
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112 | g_free( cb_data ); |
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113 | |
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114 | return req != NULL; |
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115 | } |
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116 | |
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117 | static char* oauth2_parse_error( json_value *e ) |
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118 | { |
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119 | /* This does a reasonable job with some of the flavours of error |
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120 | responses I've seen. Because apparently it's not standardised. */ |
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121 | |
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122 | if( e->type == json_object ) |
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123 | { |
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124 | /* Facebook style */ |
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125 | const char *msg = json_o_str( e, "message" ); |
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126 | const char *type = json_o_str( e, "type" ); |
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127 | json_value *code_o = json_o_get( e, "code" ); |
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128 | int code = 0; |
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129 | |
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130 | if( code_o && code_o->type == json_integer ) |
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131 | code = code_o->u.integer; |
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132 | |
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133 | return g_strdup_printf( "Error %d: %s", code, msg ? msg : type ? type : "Unknown error" ); |
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134 | } |
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135 | else if( e->type == json_string ) |
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136 | { |
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137 | return g_strdup( e->u.string.ptr ); |
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138 | } |
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139 | return NULL; |
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140 | } |
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141 | |
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142 | static void oauth2_access_token_done( struct http_request *req ) |
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143 | { |
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144 | struct oauth2_access_token_data *cb_data = req->data; |
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145 | char *atoken = NULL, *rtoken = NULL, *error = NULL; |
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146 | char *content_type; |
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147 | |
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148 | if( getenv( "BITLBEE_DEBUG" ) && req->reply_body ) |
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149 | printf( "%s\n", req->reply_body ); |
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150 | |
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151 | content_type = get_rfc822_header( req->reply_headers, "Content-Type", 0 ); |
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152 | |
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153 | if( content_type && ( strstr( content_type, "application/json" ) || |
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154 | strstr( content_type, "text/javascript" ) ) ) |
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155 | { |
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156 | json_value *js = json_parse( req->reply_body ); |
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157 | if( js && js->type == json_object ) |
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158 | { |
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159 | JSON_O_FOREACH( js, k, v ) |
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160 | { |
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161 | if( strcmp( k, "error" ) == 0 ) |
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162 | error = oauth2_parse_error( v ); |
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163 | if( v->type != json_string ) |
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164 | continue; |
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165 | if( strcmp( k, "access_token" ) == 0 ) |
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166 | atoken = g_strdup( v->u.string.ptr ); |
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167 | if( strcmp( k, "refresh_token" ) == 0 ) |
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168 | rtoken = g_strdup( v->u.string.ptr ); |
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169 | } |
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170 | } |
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171 | json_value_free( js ); |
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172 | } |
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173 | else |
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174 | { |
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175 | /* Facebook use their own odd format here, seems to be URL-encoded. */ |
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176 | GSList *p_in = NULL; |
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177 | |
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178 | oauth_params_parse( &p_in, req->reply_body ); |
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179 | atoken = g_strdup( oauth_params_get( &p_in, "access_token" ) ); |
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180 | rtoken = g_strdup( oauth_params_get( &p_in, "refresh_token" ) ); |
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181 | oauth_params_free( &p_in ); |
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182 | } |
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183 | if( getenv( "BITLBEE_DEBUG" ) ) |
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184 | printf( "Extracted atoken=%s rtoken=%s\n", atoken, rtoken ); |
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185 | if( !atoken && !rtoken && !error ) |
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186 | error = g_strdup( "Unusuable response" ); |
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187 | |
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188 | cb_data->func( cb_data->data, atoken, rtoken, error ); |
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189 | g_free( content_type ); |
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190 | g_free( atoken ); |
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191 | g_free( rtoken ); |
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192 | g_free( error ); |
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193 | g_free( cb_data ); |
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194 | } |
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