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 HMAC_BLOCK_SIZE 64 |
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36 | |
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37 | static char *oauth_sign( const char *method, const char *url, |
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38 | const char *params, struct oauth_info *oi ) |
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39 | { |
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40 | sha1_state_t sha1; |
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41 | uint8_t hash[sha1_hash_size]; |
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42 | uint8_t key[HMAC_BLOCK_SIZE+1]; |
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43 | char *s; |
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44 | int i; |
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45 | |
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46 | /* Create K. If our current key is >64 chars we have to hash it, |
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47 | otherwise just pad. */ |
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48 | memset( key, 0, HMAC_BLOCK_SIZE ); |
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49 | i = strlen( oi->sp->consumer_secret ) + 1 + ( oi->token_secret ? strlen( oi->token_secret ) : 0 ); |
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50 | if( i > HMAC_BLOCK_SIZE ) |
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51 | { |
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52 | sha1_init( &sha1 ); |
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53 | sha1_append( &sha1, (uint8_t*) oi->sp->consumer_secret, strlen( oi->sp->consumer_secret ) ); |
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54 | sha1_append( &sha1, (uint8_t*) "&", 1 ); |
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55 | if( oi->token_secret ) |
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56 | sha1_append( &sha1, (uint8_t*) oi->token_secret, strlen( oi->token_secret ) ); |
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57 | sha1_finish( &sha1, key ); |
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58 | } |
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59 | else |
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60 | { |
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61 | g_snprintf( (gchar*) key, HMAC_BLOCK_SIZE + 1, "%s&%s", |
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62 | oi->sp->consumer_secret, oi->token_secret ? oi->token_secret : "" ); |
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63 | } |
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64 | |
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65 | /* Inner part: H(K XOR 0x36, text) */ |
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66 | sha1_init( &sha1 ); |
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67 | |
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68 | for( i = 0; i < HMAC_BLOCK_SIZE; i ++ ) |
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69 | key[i] ^= 0x36; |
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70 | sha1_append( &sha1, key, HMAC_BLOCK_SIZE ); |
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71 | |
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72 | /* OAuth: text = method&url¶ms, all http_encoded. */ |
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73 | sha1_append( &sha1, (const uint8_t*) method, strlen( method ) ); |
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74 | sha1_append( &sha1, (const uint8_t*) "&", 1 ); |
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75 | |
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76 | s = g_new0( char, strlen( url ) * 3 + 1 ); |
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77 | strcpy( s, url ); |
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78 | http_encode( s ); |
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79 | sha1_append( &sha1, (const uint8_t*) s, strlen( s ) ); |
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80 | sha1_append( &sha1, (const uint8_t*) "&", 1 ); |
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81 | g_free( s ); |
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82 | |
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83 | s = g_new0( char, strlen( params ) * 3 + 1 ); |
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84 | strcpy( s, params ); |
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85 | http_encode( s ); |
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86 | sha1_append( &sha1, (const uint8_t*) s, strlen( s ) ); |
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87 | g_free( s ); |
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88 | |
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89 | sha1_finish( &sha1, hash ); |
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90 | |
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91 | /* Final result: H(K XOR 0x5C, inner stuff) */ |
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92 | sha1_init( &sha1 ); |
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93 | for( i = 0; i < HMAC_BLOCK_SIZE; i ++ ) |
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94 | key[i] ^= 0x36 ^ 0x5c; |
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95 | sha1_append( &sha1, key, HMAC_BLOCK_SIZE ); |
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96 | sha1_append( &sha1, hash, sha1_hash_size ); |
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97 | sha1_finish( &sha1, hash ); |
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98 | |
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99 | /* base64_encode + HTTP escape it (both consumers |
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100 | need it that away) and we're done. */ |
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101 | s = base64_encode( hash, sha1_hash_size ); |
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102 | s = g_realloc( s, strlen( s ) * 3 + 1 ); |
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103 | http_encode( s ); |
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104 | |
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105 | return s; |
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106 | } |
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107 | |
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108 | static char *oauth_nonce() |
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109 | { |
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110 | unsigned char bytes[9]; |
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111 | |
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112 | random_bytes( bytes, sizeof( bytes ) ); |
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113 | return base64_encode( bytes, sizeof( bytes ) ); |
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114 | } |
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115 | |
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116 | void oauth_params_add( GSList **params, const char *key, const char *value ) |
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117 | { |
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118 | char *item; |
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119 | |
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120 | item = g_strdup_printf( "%s=%s", key, value ); |
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121 | *params = g_slist_insert_sorted( *params, item, (GCompareFunc) strcmp ); |
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122 | } |
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123 | |
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124 | void oauth_params_del( GSList **params, const char *key ) |
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125 | { |
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126 | int key_len = strlen( key ); |
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127 | GSList *l, *n; |
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128 | |
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129 | for( l = *params; l; l = n ) |
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130 | { |
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131 | n = l->next; |
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132 | |
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133 | if( strncmp( (char*) l->data, key, key_len ) == 0 && |
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134 | ((char*)l->data)[key_len] == '=' ) |
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135 | { |
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136 | g_free( l->data ); |
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137 | *params = g_slist_remove( *params, l->data ); |
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138 | } |
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139 | } |
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140 | } |
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141 | |
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142 | void oauth_params_set( GSList **params, const char *key, const char *value ) |
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143 | { |
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144 | oauth_params_del( params, key ); |
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145 | oauth_params_add( params, key, value ); |
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146 | } |
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147 | |
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148 | const char *oauth_params_get( GSList **params, const char *key ) |
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149 | { |
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150 | int key_len = strlen( key ); |
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151 | GSList *l; |
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152 | |
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153 | for( l = *params; l; l = l->next ) |
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154 | { |
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155 | if( strncmp( (char*) l->data, key, key_len ) == 0 && |
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156 | ((char*)l->data)[key_len] == '=' ) |
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157 | return (const char*) l->data + key_len + 1; |
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158 | } |
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159 | |
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160 | return NULL; |
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161 | } |
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162 | |
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163 | static void oauth_params_parse( GSList **params, char *in ) |
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164 | { |
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165 | char *amp, *eq, *s; |
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166 | |
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167 | while( in && *in ) |
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168 | { |
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169 | eq = strchr( in, '=' ); |
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170 | if( !eq ) |
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171 | break; |
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172 | |
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173 | *eq = '\0'; |
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174 | if( ( amp = strchr( eq + 1, '&' ) ) ) |
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175 | *amp = '\0'; |
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176 | |
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177 | s = g_strdup( eq + 1 ); |
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178 | http_decode( s ); |
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179 | oauth_params_add( params, in, s ); |
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180 | g_free( s ); |
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181 | |
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182 | *eq = '='; |
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183 | if( amp == NULL ) |
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184 | break; |
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185 | |
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186 | *amp = '&'; |
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187 | in = amp + 1; |
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188 | } |
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189 | } |
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190 | |
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191 | void oauth_params_free( GSList **params ) |
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192 | { |
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193 | while( params && *params ) |
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194 | { |
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195 | g_free( (*params)->data ); |
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196 | *params = g_slist_remove( *params, (*params)->data ); |
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197 | } |
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198 | } |
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199 | |
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200 | char *oauth_params_string( GSList *params ) |
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201 | { |
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202 | GSList *l; |
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203 | GString *str = g_string_new( "" ); |
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204 | |
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205 | for( l = params; l; l = l->next ) |
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206 | { |
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207 | char *s, *eq; |
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208 | |
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209 | s = g_malloc( strlen( l->data ) * 3 + 1 ); |
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210 | strcpy( s, l->data ); |
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211 | if( ( eq = strchr( s, '=' ) ) ) |
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212 | http_encode( eq + 1 ); |
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213 | g_string_append( str, s ); |
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214 | g_free( s ); |
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215 | |
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216 | if( l->next ) |
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217 | g_string_append_c( str, '&' ); |
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218 | } |
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219 | |
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220 | return g_string_free( str, FALSE ); |
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221 | } |
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222 | |
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223 | void oauth_info_free( struct oauth_info *info ) |
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224 | { |
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225 | if( info ) |
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226 | { |
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227 | g_free( info->auth_url ); |
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228 | g_free( info->request_token ); |
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229 | g_free( info->token ); |
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230 | g_free( info->token_secret ); |
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231 | g_free( info ); |
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232 | } |
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233 | } |
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234 | |
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235 | static void oauth_add_default_params( GSList **params, const struct oauth_service *sp ) |
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236 | { |
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237 | char *s; |
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238 | |
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239 | oauth_params_set( params, "oauth_consumer_key", sp->consumer_key ); |
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240 | oauth_params_set( params, "oauth_signature_method", "HMAC-SHA1" ); |
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241 | |
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242 | s = g_strdup_printf( "%d", (int) time( NULL ) ); |
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243 | oauth_params_set( params, "oauth_timestamp", s ); |
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244 | g_free( s ); |
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245 | |
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246 | s = oauth_nonce(); |
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247 | oauth_params_set( params, "oauth_nonce", s ); |
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248 | g_free( s ); |
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249 | |
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250 | oauth_params_set( params, "oauth_version", "1.0" ); |
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251 | } |
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252 | |
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253 | static void *oauth_post_request( const char *url, GSList **params_, http_input_function func, struct oauth_info *oi ) |
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254 | { |
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255 | GSList *params = NULL; |
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256 | char *s, *params_s, *post; |
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257 | void *req; |
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258 | url_t url_p; |
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259 | |
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260 | if( !url_set( &url_p, url ) ) |
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261 | { |
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262 | oauth_params_free( params_ ); |
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263 | return NULL; |
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264 | } |
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265 | |
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266 | if( params_ ) |
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267 | params = *params_; |
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268 | |
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269 | oauth_add_default_params( ¶ms, oi->sp ); |
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270 | |
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271 | params_s = oauth_params_string( params ); |
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272 | oauth_params_free( ¶ms ); |
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273 | |
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274 | s = oauth_sign( "POST", url, params_s, oi ); |
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275 | post = g_strdup_printf( "%s&oauth_signature=%s", params_s, s ); |
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276 | g_free( params_s ); |
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277 | g_free( s ); |
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278 | |
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279 | s = g_strdup_printf( "POST %s HTTP/1.0\r\n" |
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280 | "Host: %s\r\n" |
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281 | "Content-Type: application/x-www-form-urlencoded\r\n" |
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282 | "Content-Length: %zd\r\n" |
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283 | "\r\n" |
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284 | "%s", url_p.file, url_p.host, strlen( post ), post ); |
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285 | g_free( post ); |
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286 | |
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287 | req = http_dorequest( url_p.host, url_p.port, url_p.proto == PROTO_HTTPS, |
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288 | s, func, oi ); |
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289 | g_free( s ); |
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290 | |
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291 | return req; |
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292 | } |
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293 | |
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294 | static void oauth_request_token_done( struct http_request *req ); |
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295 | |
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296 | struct oauth_info *oauth_request_token( const struct oauth_service *sp, oauth_cb func, void *data ) |
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297 | { |
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298 | struct oauth_info *st = g_new0( struct oauth_info, 1 ); |
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299 | GSList *params = NULL; |
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300 | |
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301 | st->func = func; |
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302 | st->data = data; |
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303 | st->sp = sp; |
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304 | |
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305 | oauth_params_add( ¶ms, "oauth_callback", "oob" ); |
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306 | |
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307 | if( !oauth_post_request( sp->url_request_token, ¶ms, oauth_request_token_done, st ) ) |
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308 | { |
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309 | oauth_info_free( st ); |
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310 | return NULL; |
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311 | } |
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312 | |
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313 | return st; |
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314 | } |
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315 | |
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316 | static void oauth_request_token_done( struct http_request *req ) |
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317 | { |
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318 | struct oauth_info *st = req->data; |
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319 | |
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320 | st->http = req; |
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321 | |
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322 | if( req->status_code == 200 ) |
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323 | { |
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324 | GSList *params = NULL; |
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325 | |
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326 | st->auth_url = g_strdup_printf( "%s?%s", st->sp->url_authorize, req->reply_body ); |
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327 | oauth_params_parse( ¶ms, req->reply_body ); |
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328 | st->request_token = g_strdup( oauth_params_get( ¶ms, "oauth_token" ) ); |
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329 | oauth_params_free( ¶ms ); |
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330 | } |
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331 | |
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332 | st->stage = OAUTH_REQUEST_TOKEN; |
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333 | st->func( st ); |
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334 | } |
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335 | |
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336 | static void oauth_access_token_done( struct http_request *req ); |
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337 | |
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338 | gboolean oauth_access_token( const char *pin, struct oauth_info *st ) |
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339 | { |
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340 | GSList *params = NULL; |
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341 | |
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342 | oauth_params_add( ¶ms, "oauth_token", st->request_token ); |
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343 | oauth_params_add( ¶ms, "oauth_verifier", pin ); |
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344 | |
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345 | return oauth_post_request( st->sp->url_access_token, ¶ms, oauth_access_token_done, st ) != NULL; |
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346 | } |
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347 | |
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348 | static void oauth_access_token_done( struct http_request *req ) |
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349 | { |
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350 | struct oauth_info *st = req->data; |
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351 | |
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352 | st->http = req; |
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353 | |
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354 | if( req->status_code == 200 ) |
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355 | { |
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356 | GSList *params = NULL; |
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357 | |
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358 | oauth_params_parse( ¶ms, req->reply_body ); |
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359 | st->token = g_strdup( oauth_params_get( ¶ms, "oauth_token" ) ); |
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360 | st->token_secret = g_strdup( oauth_params_get( ¶ms, "oauth_token_secret" ) ); |
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361 | oauth_params_free( ¶ms ); |
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362 | } |
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363 | |
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364 | st->stage = OAUTH_ACCESS_TOKEN; |
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365 | if( st->func( st ) ) |
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366 | { |
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367 | /* Don't need these anymore, but keep the rest. */ |
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368 | g_free( st->auth_url ); |
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369 | st->auth_url = NULL; |
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370 | g_free( st->request_token ); |
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371 | st->request_token = NULL; |
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372 | } |
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373 | } |
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374 | |
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375 | char *oauth_http_header( struct oauth_info *oi, const char *method, const char *url, char *args ) |
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376 | { |
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377 | GSList *params = NULL, *l; |
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378 | char *sig = NULL, *params_s, *s; |
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379 | GString *ret = NULL; |
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380 | |
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381 | oauth_params_add( ¶ms, "oauth_token", oi->token ); |
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382 | oauth_add_default_params( ¶ms, oi->sp ); |
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383 | |
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384 | /* Start building the OAuth header. 'key="value", '... */ |
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385 | ret = g_string_new( "OAuth " ); |
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386 | for( l = params; l; l = l->next ) |
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387 | { |
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388 | char *kv = l->data; |
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389 | char *eq = strchr( kv, '=' ); |
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390 | char esc[strlen(kv)*3+1]; |
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391 | |
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392 | if( eq == NULL ) |
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393 | break; /* WTF */ |
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394 | |
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395 | strcpy( esc, eq + 1 ); |
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396 | http_encode( esc ); |
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397 | |
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398 | g_string_append_len( ret, kv, eq - kv + 1 ); |
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399 | g_string_append_c( ret, '"' ); |
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400 | g_string_append( ret, esc ); |
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401 | g_string_append( ret, "\", " ); |
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402 | } |
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403 | |
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404 | /* Now, before generating the signature, add GET/POST arguments to params |
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405 | since they should be included in the base signature string (but not in |
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406 | the HTTP header). */ |
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407 | if( args ) |
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408 | oauth_params_parse( ¶ms, args ); |
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409 | if( ( s = strchr( url, '?' ) ) ) |
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410 | { |
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411 | s = g_strdup( s + 1 ); |
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412 | oauth_params_parse( ¶ms, s ); |
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413 | g_free( s ); |
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414 | } |
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415 | |
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416 | /* Append the signature and we're done! */ |
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417 | params_s = oauth_params_string( params ); |
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418 | sig = oauth_sign( method, url, params_s, oi ); |
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419 | g_string_append_printf( ret, "oauth_signature=\"%s\"", sig ); |
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420 | g_free( params_s ); |
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421 | |
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422 | oauth_params_free( ¶ms ); |
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423 | g_free( sig ); |
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424 | |
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425 | return ret ? g_string_free( ret, FALSE ) : NULL; |
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426 | } |
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427 | |
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428 | char *oauth_to_string( struct oauth_info *oi ) |
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429 | { |
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430 | GSList *params = NULL; |
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431 | char *ret; |
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432 | |
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433 | oauth_params_add( ¶ms, "oauth_token", oi->token ); |
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434 | oauth_params_add( ¶ms, "oauth_token_secret", oi->token_secret ); |
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435 | ret = oauth_params_string( params ); |
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436 | oauth_params_free( ¶ms ); |
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437 | |
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438 | return ret; |
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439 | } |
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440 | |
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441 | struct oauth_info *oauth_from_string( char *in, const struct oauth_service *sp ) |
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442 | { |
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443 | struct oauth_info *oi = g_new0( struct oauth_info, 1 ); |
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444 | GSList *params = NULL; |
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445 | |
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446 | oauth_params_parse( ¶ms, in ); |
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447 | oi->token = g_strdup( oauth_params_get( ¶ms, "oauth_token" ) ); |
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448 | oi->token_secret = g_strdup( oauth_params_get( ¶ms, "oauth_token_secret" ) ); |
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449 | oauth_params_free( ¶ms ); |
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450 | oi->sp = sp; |
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451 | |
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452 | return oi; |
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453 | } |
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