1 | /***************************************************************************\ |
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2 | * * |
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3 | * BitlBee - An IRC to IM gateway * |
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4 | * Simple OAuth client (consumer) implementation. * |
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5 | * * |
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6 | * Copyright 2010 Wilmer van der Gaast <wilmer@gaast.net> * |
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7 | * * |
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8 | * This library is free software; you can redistribute it and/or * |
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9 | * modify it under the terms of the GNU Lesser General Public * |
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10 | * License as published by the Free Software Foundation, version * |
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11 | * 2.1. * |
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12 | * * |
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13 | * This library 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 GNU * |
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16 | * Lesser 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 Lesser General Public License * |
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19 | * along with this library; if not, write to the Free Software Foundation, * |
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20 | * Inc., 51 Franklin St, 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 | #include <glib.h> |
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25 | #include <gmodule.h> |
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26 | #include <stdlib.h> |
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27 | #include <string.h> |
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28 | #include "http_client.h" |
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29 | #include "base64.h" |
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30 | #include "misc.h" |
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31 | #include "sha1.h" |
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32 | #include "url.h" |
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33 | #include "oauth.h" |
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34 | |
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35 | #define CONSUMER_KEY "xsDNKJuNZYkZyMcu914uEA" |
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36 | #define CONSUMER_SECRET "FCxqcr0pXKzsF9ajmP57S3VQ8V6Drk4o2QYtqMcOszo" |
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37 | /* How can it be a secret if it's right here in the source code? No clue... */ |
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38 | |
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39 | #define HMAC_BLOCK_SIZE 64 |
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40 | |
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41 | static char *oauth_sign( const char *method, const char *url, |
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42 | const char *params, const char *token_secret ) |
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43 | { |
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44 | sha1_state_t sha1; |
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45 | uint8_t hash[sha1_hash_size]; |
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46 | uint8_t key[HMAC_BLOCK_SIZE+1]; |
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47 | char *s; |
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48 | int i; |
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49 | |
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50 | /* Create K. If our current key is >64 chars we have to hash it, |
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51 | otherwise just pad. */ |
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52 | memset( key, 0, HMAC_BLOCK_SIZE ); |
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53 | i = strlen( CONSUMER_SECRET ) + 1 + ( token_secret ? strlen( token_secret ) : 0 ); |
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54 | if( i > HMAC_BLOCK_SIZE ) |
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55 | { |
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56 | sha1_init( &sha1 ); |
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57 | sha1_append( &sha1, (uint8_t*) CONSUMER_SECRET, strlen( CONSUMER_SECRET ) ); |
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58 | sha1_append( &sha1, (uint8_t*) "&", 1 ); |
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59 | if( token_secret ) |
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60 | sha1_append( &sha1, (uint8_t*) token_secret, strlen( token_secret ) ); |
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61 | sha1_finish( &sha1, key ); |
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62 | } |
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63 | else |
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64 | { |
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65 | g_snprintf( (gchar*) key, HMAC_BLOCK_SIZE + 1, "%s&%s", |
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66 | CONSUMER_SECRET, token_secret ? : "" ); |
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67 | } |
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68 | |
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69 | /* Inner part: H(K XOR 0x36, text) */ |
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70 | sha1_init( &sha1 ); |
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71 | |
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72 | for( i = 0; i < HMAC_BLOCK_SIZE; i ++ ) |
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73 | key[i] ^= 0x36; |
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74 | sha1_append( &sha1, key, HMAC_BLOCK_SIZE ); |
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75 | |
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76 | /* OAuth: text = method&url¶ms, all http_encoded. */ |
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77 | sha1_append( &sha1, (const uint8_t*) method, strlen( method ) ); |
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78 | sha1_append( &sha1, (const uint8_t*) "&", 1 ); |
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79 | |
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80 | s = g_new0( char, strlen( url ) * 3 + 1 ); |
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81 | strcpy( s, url ); |
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82 | http_encode( s ); |
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83 | sha1_append( &sha1, (const uint8_t*) s, strlen( s ) ); |
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84 | sha1_append( &sha1, (const uint8_t*) "&", 1 ); |
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85 | g_free( s ); |
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86 | |
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87 | s = g_new0( char, strlen( params ) * 3 + 1 ); |
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88 | strcpy( s, params ); |
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89 | http_encode( s ); |
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90 | sha1_append( &sha1, (const uint8_t*) s, strlen( s ) ); |
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91 | g_free( s ); |
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92 | |
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93 | sha1_finish( &sha1, hash ); |
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94 | |
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95 | /* Final result: H(K XOR 0x5C, inner stuff) */ |
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96 | sha1_init( &sha1 ); |
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97 | for( i = 0; i < HMAC_BLOCK_SIZE; i ++ ) |
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98 | key[i] ^= 0x36 ^ 0x5c; |
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99 | sha1_append( &sha1, key, HMAC_BLOCK_SIZE ); |
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100 | sha1_append( &sha1, hash, sha1_hash_size ); |
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101 | sha1_finish( &sha1, hash ); |
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102 | |
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103 | /* base64_encode + HTTP escape it (both consumers |
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104 | need it that away) and we're done. */ |
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105 | s = base64_encode( hash, sha1_hash_size ); |
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106 | s = g_realloc( s, strlen( s ) * 3 + 1 ); |
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107 | http_encode( s ); |
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108 | |
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109 | return s; |
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110 | } |
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111 | |
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112 | static char *oauth_nonce() |
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113 | { |
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114 | unsigned char bytes[9]; |
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115 | |
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116 | random_bytes( bytes, sizeof( bytes ) ); |
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117 | return base64_encode( bytes, sizeof( bytes ) ); |
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118 | } |
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119 | |
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120 | void oauth_params_add( GSList **params, const char *key, const char *value ) |
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121 | { |
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122 | char *item; |
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123 | |
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124 | item = g_strdup_printf( "%s=%s", key, value ); |
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125 | *params = g_slist_insert_sorted( *params, item, (GCompareFunc) strcmp ); |
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126 | } |
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127 | |
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128 | void oauth_params_del( GSList **params, const char *key ) |
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129 | { |
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130 | int key_len = strlen( key ); |
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131 | GSList *l, *n; |
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132 | |
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133 | for( l = *params; l; l = n ) |
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134 | { |
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135 | n = l->next; |
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136 | |
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137 | if( strncmp( (char*) l->data, key, key_len ) == 0 && |
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138 | ((char*)l->data)[key_len] == '=' ) |
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139 | { |
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140 | g_free( l->data ); |
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141 | *params = g_slist_remove( *params, l->data ); |
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142 | } |
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143 | } |
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144 | } |
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145 | |
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146 | void oauth_params_set( GSList **params, const char *key, const char *value ) |
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147 | { |
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148 | oauth_params_del( params, key ); |
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149 | oauth_params_add( params, key, value ); |
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150 | } |
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151 | |
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152 | const char *oauth_params_get( GSList **params, const char *key ) |
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153 | { |
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154 | int key_len = strlen( key ); |
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155 | GSList *l; |
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156 | |
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157 | for( l = *params; l; l = l->next ) |
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158 | { |
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159 | if( strncmp( (char*) l->data, key, key_len ) == 0 && |
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160 | ((char*)l->data)[key_len] == '=' ) |
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161 | return (const char*) l->data + key_len + 1; |
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162 | } |
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163 | |
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164 | return NULL; |
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165 | } |
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166 | |
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167 | static void oauth_params_parse( GSList **params, char *in ) |
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168 | { |
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169 | char *amp, *eq, *s; |
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170 | |
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171 | while( in && *in ) |
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172 | { |
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173 | eq = strchr( in, '=' ); |
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174 | if( !eq ) |
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175 | break; |
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176 | |
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177 | *eq = '\0'; |
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178 | if( ( amp = strchr( eq + 1, '&' ) ) ) |
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179 | *amp = '\0'; |
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180 | |
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181 | s = g_strdup( eq + 1 ); |
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182 | http_decode( s ); |
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183 | oauth_params_add( params, in, s ); |
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184 | g_free( s ); |
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185 | |
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186 | *eq = '='; |
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187 | if( amp == NULL ) |
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188 | break; |
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189 | |
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190 | *amp = '&'; |
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191 | in = amp + 1; |
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192 | } |
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193 | } |
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194 | |
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195 | void oauth_params_free( GSList **params ) |
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196 | { |
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197 | while( params && *params ) |
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198 | { |
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199 | g_free( (*params)->data ); |
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200 | *params = g_slist_remove( *params, (*params)->data ); |
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201 | } |
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202 | } |
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203 | |
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204 | char *oauth_params_string( GSList *params ) |
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205 | { |
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206 | GSList *l; |
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207 | GString *str = g_string_new( "" ); |
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208 | |
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209 | for( l = params; l; l = l->next ) |
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210 | { |
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211 | char *s, *eq; |
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212 | |
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213 | s = g_malloc( strlen( l->data ) * 3 + 1 ); |
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214 | strcpy( s, l->data ); |
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215 | if( ( eq = strchr( s, '=' ) ) ) |
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216 | http_encode( eq + 1 ); |
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217 | g_string_append( str, s ); |
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218 | g_free( s ); |
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219 | |
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220 | if( l->next ) |
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221 | g_string_append_c( str, '&' ); |
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222 | } |
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223 | |
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224 | return g_string_free( str, FALSE ); |
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225 | } |
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226 | |
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227 | void oauth_info_free( struct oauth_info *info ) |
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228 | { |
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229 | if( info ) |
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230 | { |
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231 | g_free( info->auth_params ); |
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232 | g_free( info->request_token ); |
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233 | g_free( info->access_token ); |
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234 | g_free( info ); |
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235 | } |
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236 | } |
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237 | |
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238 | static void oauth_add_default_params( GSList **params ) |
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239 | { |
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240 | char *s; |
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241 | |
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242 | oauth_params_set( params, "oauth_consumer_key", CONSUMER_KEY ); |
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243 | oauth_params_set( params, "oauth_signature_method", "HMAC-SHA1" ); |
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244 | |
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245 | s = g_strdup_printf( "%d", (int) time( NULL ) ); |
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246 | oauth_params_set( params, "oauth_timestamp", s ); |
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247 | g_free( s ); |
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248 | |
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249 | s = oauth_nonce(); |
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250 | oauth_params_set( params, "oauth_nonce", s ); |
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251 | g_free( s ); |
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252 | |
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253 | oauth_params_set( params, "oauth_version", "1.0" ); |
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254 | } |
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255 | |
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256 | static void *oauth_post_request( const char *url, GSList **params_, http_input_function func, void *data ) |
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257 | { |
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258 | GSList *params = NULL; |
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259 | char *s, *params_s, *post; |
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260 | void *req; |
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261 | url_t url_p; |
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262 | |
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263 | if( !url_set( &url_p, url ) ) |
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264 | { |
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265 | oauth_params_free( params_ ); |
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266 | return NULL; |
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267 | } |
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268 | |
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269 | if( params_ ) |
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270 | params = *params_; |
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271 | |
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272 | oauth_add_default_params( ¶ms ); |
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273 | |
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274 | params_s = oauth_params_string( params ); |
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275 | oauth_params_free( params_ ); |
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276 | |
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277 | s = oauth_sign( "POST", url, params_s, NULL ); |
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278 | post = g_strdup_printf( "%s&oauth_signature=%s", params_s, s ); |
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279 | g_free( params_s ); |
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280 | g_free( s ); |
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281 | |
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282 | s = g_strdup_printf( "POST %s HTTP/1.0\r\n" |
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283 | "Host: %s\r\n" |
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284 | "Content-Type: application/x-www-form-urlencoded\r\n" |
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285 | "Content-Length: %zd\r\n" |
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286 | "\r\n" |
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287 | "%s", url_p.file, url_p.host, strlen( post ), post ); |
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288 | g_free( post ); |
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289 | |
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290 | req = http_dorequest( url_p.host, url_p.port, url_p.proto == PROTO_HTTPS, |
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291 | s, func, data ); |
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292 | g_free( s ); |
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293 | |
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294 | return req; |
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295 | } |
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296 | |
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297 | static void oauth_request_token_done( struct http_request *req ); |
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298 | |
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299 | struct oauth_info *oauth_request_token( const char *url, oauth_cb func, void *data ) |
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300 | { |
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301 | struct oauth_info *st = g_new0( struct oauth_info, 1 ); |
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302 | GSList *params = NULL; |
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303 | |
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304 | st->func = func; |
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305 | st->data = data; |
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306 | |
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307 | oauth_params_add( ¶ms, "oauth_callback", "oob" ); |
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308 | |
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309 | if( !oauth_post_request( url, ¶ms, oauth_request_token_done, st ) ) |
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310 | { |
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311 | oauth_info_free( st ); |
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312 | return NULL; |
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313 | } |
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314 | |
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315 | return st; |
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316 | } |
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317 | |
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318 | static void oauth_request_token_done( struct http_request *req ) |
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319 | { |
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320 | struct oauth_info *st = req->data; |
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321 | |
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322 | st->http = req; |
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323 | |
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324 | if( req->status_code == 200 ) |
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325 | { |
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326 | GSList *params = NULL; |
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327 | |
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328 | st->auth_params = g_strdup( req->reply_body ); |
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329 | oauth_params_parse( ¶ms, st->auth_params ); |
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330 | st->request_token = g_strdup( oauth_params_get( ¶ms, "oauth_token" ) ); |
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331 | oauth_params_free( ¶ms ); |
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332 | } |
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333 | |
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334 | st->stage = OAUTH_REQUEST_TOKEN; |
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335 | if( !st->func( st ) ) |
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336 | oauth_info_free( st ); |
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337 | } |
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338 | |
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339 | static void oauth_access_token_done( struct http_request *req ); |
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340 | |
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341 | void oauth_access_token( const char *url, const char *pin, struct oauth_info *st ) |
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342 | { |
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343 | GSList *params = NULL; |
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344 | |
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345 | oauth_params_add( ¶ms, "oauth_token", st->request_token ); |
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346 | oauth_params_add( ¶ms, "oauth_verifier", pin ); |
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347 | |
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348 | if( !oauth_post_request( url, ¶ms, oauth_access_token_done, st ) ) |
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349 | oauth_info_free( st ); |
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350 | } |
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351 | |
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352 | static void oauth_access_token_done( struct http_request *req ) |
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353 | { |
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354 | struct oauth_info *st = req->data; |
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355 | |
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356 | if( req->status_code == 200 ) |
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357 | { |
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358 | GSList *params = NULL; |
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359 | const char *token, *token_secret; |
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360 | |
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361 | oauth_params_parse( ¶ms, req->reply_body ); |
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362 | token = oauth_params_get( ¶ms, "oauth_token" ); |
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363 | token_secret = oauth_params_get( ¶ms, "oauth_token_secret" ); |
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364 | st->access_token = g_strdup_printf( |
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365 | "oauth_token=%s&oauth_token_secret=%s", token, token_secret ); |
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366 | oauth_params_free( ¶ms ); |
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367 | } |
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368 | |
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369 | st->stage = OAUTH_ACCESS_TOKEN; |
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370 | st->func( st ); |
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371 | oauth_info_free( st ); |
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372 | } |
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373 | |
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374 | char *oauth_http_header( char *access_token, const char *method, const char *url, char *args ) |
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375 | { |
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376 | GSList *params = NULL, *l; |
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377 | char *token_secret, *sig, *params_s, *s; |
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378 | GString *ret = NULL; |
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379 | |
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380 | /* First, get the two pieces of info from the access token that we need. */ |
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381 | oauth_params_parse( ¶ms, access_token ); |
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382 | if( params == NULL ) |
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383 | goto err; |
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384 | |
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385 | /* Pick out the token secret, we shouldn't include it but use it for signing. */ |
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386 | token_secret = g_strdup( oauth_params_get( ¶ms, "oauth_token_secret" ) ); |
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387 | if( token_secret == NULL ) |
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388 | goto err; |
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389 | oauth_params_del( ¶ms, "oauth_token_secret" ); |
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390 | |
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391 | oauth_add_default_params( ¶ms ); |
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392 | |
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393 | /* Start building the OAuth header. 'key="value", '... */ |
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394 | ret = g_string_new( "OAuth " ); |
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395 | for( l = params; l; l = l->next ) |
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396 | { |
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397 | char *kv = l->data; |
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398 | char *eq = strchr( kv, '=' ); |
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399 | char esc[strlen(kv)*3+1]; |
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400 | |
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401 | if( eq == NULL ) |
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402 | break; /* WTF */ |
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403 | |
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404 | strcpy( esc, eq + 1 ); |
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405 | http_encode( esc ); |
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406 | |
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407 | g_string_append_len( ret, kv, eq - kv + 1 ); |
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408 | g_string_append_c( ret, '"' ); |
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409 | g_string_append( ret, esc ); |
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410 | g_string_append( ret, "\", " ); |
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411 | } |
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412 | |
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413 | /* Now, before generating the signature, add GET/POST arguments to params |
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414 | since they should be included in the base signature string (but not in |
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415 | the HTTP header). */ |
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416 | if( args ) |
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417 | oauth_params_parse( ¶ms, args ); |
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418 | if( ( s = strchr( url, '?' ) ) ) |
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419 | { |
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420 | s = g_strdup( s + 1 ); |
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421 | oauth_params_parse( ¶ms, s + 1 ); |
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422 | g_free( s ); |
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423 | } |
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424 | |
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425 | /* Append the signature and we're done! */ |
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426 | params_s = oauth_params_string( params ); |
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427 | sig = oauth_sign( method, url, params_s, token_secret ); |
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428 | g_string_append_printf( ret, "oauth_signature=\"%s\"", sig ); |
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429 | g_free( params_s ); |
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430 | |
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431 | err: |
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432 | oauth_params_free( ¶ms ); |
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433 | g_free( sig ); |
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434 | g_free( token_secret ); |
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435 | |
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436 | return ret ? g_string_free( ret, FALSE ) : NULL; |
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437 | } |
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