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 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 | #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 | uint8_t hash[SHA1_HASH_SIZE]; |
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41 | GString *payload = g_string_new(""); |
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42 | char *key; |
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43 | char *s; |
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44 | |
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45 | key = g_strdup_printf("%s&%s", oi->sp->consumer_secret, oi->token_secret ? oi->token_secret : ""); |
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46 | |
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47 | g_string_append_printf(payload, "%s&", method); |
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48 | |
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49 | s = g_new0(char, strlen(url) * 3 + 1); |
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50 | strcpy(s, url); |
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51 | http_encode(s); |
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52 | g_string_append_printf(payload, "%s&", s); |
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53 | g_free(s); |
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54 | |
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55 | s = g_new0(char, strlen(params) * 3 + 1); |
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56 | strcpy(s, params); |
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57 | http_encode(s); |
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58 | g_string_append(payload, s); |
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59 | g_free(s); |
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60 | |
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61 | sha1_hmac(key, 0, payload->str, 0, hash); |
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62 | |
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63 | g_free(key); |
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64 | g_string_free(payload, TRUE); |
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65 | |
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66 | /* base64_encode + HTTP escape it (both consumers |
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67 | need it that away) and we're done. */ |
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68 | s = base64_encode(hash, SHA1_HASH_SIZE); |
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69 | s = g_realloc(s, strlen(s) * 3 + 1); |
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70 | http_encode(s); |
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71 | |
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72 | return s; |
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73 | } |
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74 | |
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75 | static char *oauth_nonce() |
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76 | { |
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77 | unsigned char bytes[21]; |
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78 | |
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79 | random_bytes(bytes, sizeof(bytes)); |
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80 | return base64_encode(bytes, sizeof(bytes)); |
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81 | } |
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82 | |
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83 | void oauth_params_add(GSList **params, const char *key, const char *value) |
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84 | { |
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85 | char *item; |
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86 | |
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87 | if (!key || !value) { |
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88 | return; |
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89 | } |
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90 | |
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91 | item = g_strdup_printf("%s=%s", key, value); |
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92 | *params = g_slist_insert_sorted(*params, item, (GCompareFunc) strcmp); |
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93 | } |
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94 | |
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95 | void oauth_params_del(GSList **params, const char *key) |
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96 | { |
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97 | int key_len = strlen(key); |
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98 | GSList *l, *n; |
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99 | |
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100 | if (params == NULL) { |
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101 | return; |
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102 | } |
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103 | |
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104 | for (l = *params; l; l = n) { |
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105 | n = l->next; |
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106 | |
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107 | if (strncmp((char *) l->data, key, key_len) == 0 && |
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108 | ((char *) l->data)[key_len] == '=') { |
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109 | g_free(l->data); |
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110 | *params = g_slist_remove(*params, l->data); |
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111 | } |
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112 | } |
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113 | } |
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114 | |
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115 | void oauth_params_set(GSList **params, const char *key, const char *value) |
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116 | { |
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117 | oauth_params_del(params, key); |
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118 | oauth_params_add(params, key, value); |
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119 | } |
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120 | |
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121 | const char *oauth_params_get(GSList **params, const char *key) |
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122 | { |
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123 | int key_len = strlen(key); |
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124 | GSList *l; |
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125 | |
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126 | if (params == NULL) { |
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127 | return NULL; |
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128 | } |
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129 | |
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130 | for (l = *params; l; l = l->next) { |
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131 | if (strncmp((char *) l->data, key, key_len) == 0 && |
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132 | ((char *) l->data)[key_len] == '=') { |
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133 | return (const char *) l->data + key_len + 1; |
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134 | } |
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135 | } |
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136 | |
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137 | return NULL; |
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138 | } |
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139 | |
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140 | void oauth_params_parse(GSList **params, char *in) |
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141 | { |
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142 | char *amp, *eq, *s; |
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143 | |
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144 | while (in && *in) { |
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145 | eq = strchr(in, '='); |
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146 | if (!eq) { |
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147 | break; |
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148 | } |
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149 | |
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150 | *eq = '\0'; |
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151 | if ((amp = strchr(eq + 1, '&'))) { |
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152 | *amp = '\0'; |
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153 | } |
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154 | |
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155 | s = g_strdup(eq + 1); |
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156 | http_decode(s); |
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157 | oauth_params_add(params, in, s); |
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158 | g_free(s); |
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159 | |
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160 | *eq = '='; |
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161 | if (amp == NULL) { |
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162 | break; |
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163 | } |
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164 | |
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165 | *amp = '&'; |
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166 | in = amp + 1; |
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167 | } |
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168 | } |
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169 | |
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170 | void oauth_params_free(GSList **params) |
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171 | { |
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172 | while (params && *params) { |
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173 | g_free((*params)->data); |
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174 | *params = g_slist_remove(*params, (*params)->data); |
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175 | } |
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176 | } |
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177 | |
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178 | char *oauth_params_string(GSList *params) |
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179 | { |
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180 | GSList *l; |
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181 | GString *str = g_string_new(""); |
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182 | |
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183 | for (l = params; l; l = l->next) { |
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184 | char *s, *eq; |
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185 | |
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186 | s = g_malloc(strlen(l->data) * 3 + 1); |
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187 | strcpy(s, l->data); |
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188 | if ((eq = strchr(s, '='))) { |
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189 | http_encode(eq + 1); |
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190 | } |
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191 | g_string_append(str, s); |
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192 | g_free(s); |
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193 | |
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194 | if (l->next) { |
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195 | g_string_append_c(str, '&'); |
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196 | } |
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197 | } |
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198 | |
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199 | return g_string_free(str, FALSE); |
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200 | } |
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201 | |
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202 | void oauth_info_free(struct oauth_info *info) |
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203 | { |
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204 | if (info) { |
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205 | g_free(info->auth_url); |
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206 | g_free(info->request_token); |
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207 | g_free(info->token); |
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208 | g_free(info->token_secret); |
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209 | oauth_params_free(&info->params); |
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210 | g_free(info); |
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211 | } |
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212 | } |
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213 | |
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214 | static void oauth_add_default_params(GSList **params, const struct oauth_service *sp) |
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215 | { |
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216 | char *s; |
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217 | |
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218 | oauth_params_set(params, "oauth_consumer_key", sp->consumer_key); |
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219 | oauth_params_set(params, "oauth_signature_method", "HMAC-SHA1"); |
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220 | |
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221 | s = g_strdup_printf("%d", (int) time(NULL)); |
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222 | oauth_params_set(params, "oauth_timestamp", s); |
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223 | g_free(s); |
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224 | |
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225 | s = oauth_nonce(); |
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226 | oauth_params_set(params, "oauth_nonce", s); |
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227 | g_free(s); |
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228 | |
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229 | oauth_params_set(params, "oauth_version", "1.0"); |
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230 | } |
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231 | |
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232 | static void *oauth_post_request(const char *url, GSList **params_, http_input_function func, struct oauth_info *oi) |
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233 | { |
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234 | GSList *params = NULL; |
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235 | char *s, *params_s, *post; |
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236 | void *req; |
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237 | url_t url_p; |
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238 | |
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239 | if (!url_set(&url_p, url)) { |
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240 | oauth_params_free(params_); |
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241 | return NULL; |
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242 | } |
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243 | |
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244 | if (params_) { |
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245 | params = *params_; |
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246 | } |
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247 | |
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248 | oauth_add_default_params(¶ms, oi->sp); |
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249 | |
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250 | params_s = oauth_params_string(params); |
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251 | oauth_params_free(¶ms); |
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252 | |
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253 | s = oauth_sign("POST", url, params_s, oi); |
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254 | post = g_strdup_printf("%s&oauth_signature=%s", params_s, s); |
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255 | g_free(params_s); |
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256 | g_free(s); |
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257 | |
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258 | s = g_strdup_printf("POST %s HTTP/1.0\r\n" |
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259 | "Host: %s\r\n" |
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260 | "Content-Type: application/x-www-form-urlencoded\r\n" |
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261 | "Content-Length: %zd\r\n" |
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262 | "\r\n" |
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263 | "%s", url_p.file, url_p.host, strlen(post), post); |
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264 | g_free(post); |
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265 | |
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266 | req = http_dorequest(url_p.host, url_p.port, url_p.proto == PROTO_HTTPS, |
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267 | s, func, oi); |
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268 | g_free(s); |
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269 | |
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270 | return req; |
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271 | } |
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272 | |
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273 | static void oauth_request_token_done(struct http_request *req); |
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274 | |
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275 | struct oauth_info *oauth_request_token(const struct oauth_service *sp, oauth_cb func, void *data) |
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276 | { |
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277 | struct oauth_info *st = g_new0(struct oauth_info, 1); |
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278 | GSList *params = NULL; |
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279 | |
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280 | st->func = func; |
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281 | st->data = data; |
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282 | st->sp = sp; |
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283 | |
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284 | oauth_params_add(¶ms, "oauth_callback", "oob"); |
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285 | |
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286 | if (!oauth_post_request(sp->url_request_token, ¶ms, oauth_request_token_done, st)) { |
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287 | oauth_info_free(st); |
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288 | return NULL; |
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289 | } |
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290 | |
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291 | return st; |
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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 *st = req->data; |
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297 | |
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298 | st->http = req; |
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299 | |
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300 | if (req->status_code == 200) { |
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301 | GSList *params = NULL; |
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302 | |
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303 | st->auth_url = g_strdup_printf("%s?%s", st->sp->url_authorize, req->reply_body); |
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304 | oauth_params_parse(¶ms, req->reply_body); |
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305 | st->request_token = g_strdup(oauth_params_get(¶ms, "oauth_token")); |
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306 | st->token_secret = g_strdup(oauth_params_get(¶ms, "oauth_token_secret")); |
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307 | oauth_params_free(¶ms); |
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308 | } |
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309 | |
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310 | st->stage = OAUTH_REQUEST_TOKEN; |
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311 | st->func(st); |
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312 | } |
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313 | |
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314 | static void oauth_access_token_done(struct http_request *req); |
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315 | |
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316 | gboolean oauth_access_token(const char *pin, struct oauth_info *st) |
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317 | { |
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318 | GSList *params = NULL; |
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319 | |
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320 | oauth_params_add(¶ms, "oauth_token", st->request_token); |
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321 | oauth_params_add(¶ms, "oauth_verifier", pin); |
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322 | |
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323 | return oauth_post_request(st->sp->url_access_token, ¶ms, oauth_access_token_done, st) != NULL; |
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324 | } |
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325 | |
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326 | static void oauth_access_token_done(struct http_request *req) |
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327 | { |
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328 | struct oauth_info *st = req->data; |
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329 | |
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330 | st->http = req; |
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331 | |
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332 | if (req->status_code == 200) { |
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333 | oauth_params_parse(&st->params, req->reply_body); |
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334 | st->token = g_strdup(oauth_params_get(&st->params, "oauth_token")); |
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335 | g_free(st->token_secret); |
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336 | st->token_secret = g_strdup(oauth_params_get(&st->params, "oauth_token_secret")); |
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337 | } |
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338 | |
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339 | st->stage = OAUTH_ACCESS_TOKEN; |
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340 | if (st->func(st)) { |
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341 | /* Don't need these anymore, but keep the rest. */ |
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342 | g_free(st->auth_url); |
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343 | st->auth_url = NULL; |
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344 | g_free(st->request_token); |
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345 | st->request_token = NULL; |
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346 | oauth_params_free(&st->params); |
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347 | } |
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348 | } |
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349 | |
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350 | char *oauth_http_header(struct oauth_info *oi, const char *method, const char *url, char *args) |
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351 | { |
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352 | GSList *params = NULL, *l; |
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353 | char *sig = NULL, *params_s, *s; |
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354 | GString *ret = NULL; |
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355 | |
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356 | oauth_params_add(¶ms, "oauth_token", oi->token); |
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357 | oauth_add_default_params(¶ms, oi->sp); |
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358 | |
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359 | /* Start building the OAuth header. 'key="value", '... */ |
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360 | ret = g_string_new("OAuth "); |
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361 | for (l = params; l; l = l->next) { |
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362 | char *kv = l->data; |
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363 | char *eq = strchr(kv, '='); |
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364 | char esc[strlen(kv) * 3 + 1]; |
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365 | |
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366 | if (eq == NULL) { |
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367 | break; /* WTF */ |
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368 | |
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369 | } |
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370 | strcpy(esc, eq + 1); |
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371 | http_encode(esc); |
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372 | |
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373 | g_string_append_len(ret, kv, eq - kv + 1); |
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374 | g_string_append_c(ret, '"'); |
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375 | g_string_append(ret, esc); |
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376 | g_string_append(ret, "\", "); |
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377 | } |
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378 | |
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379 | /* Now, before generating the signature, add GET/POST arguments to params |
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380 | since they should be included in the base signature string (but not in |
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381 | the HTTP header). */ |
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382 | if (args) { |
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383 | oauth_params_parse(¶ms, args); |
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384 | } |
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385 | if ((s = strchr(url, '?'))) { |
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386 | s = g_strdup(s + 1); |
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387 | oauth_params_parse(¶ms, s); |
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388 | g_free(s); |
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389 | } |
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390 | |
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391 | /* Append the signature and we're done! */ |
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392 | params_s = oauth_params_string(params); |
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393 | sig = oauth_sign(method, url, params_s, oi); |
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394 | g_string_append_printf(ret, "oauth_signature=\"%s\"", sig); |
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395 | g_free(params_s); |
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396 | |
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397 | oauth_params_free(¶ms); |
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398 | g_free(sig); |
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399 | |
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400 | return ret ? g_string_free(ret, FALSE) : NULL; |
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401 | } |
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402 | |
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403 | char *oauth_to_string(struct oauth_info *oi) |
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404 | { |
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405 | GSList *params = NULL; |
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406 | char *ret; |
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407 | |
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408 | oauth_params_add(¶ms, "oauth_token", oi->token); |
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409 | oauth_params_add(¶ms, "oauth_token_secret", oi->token_secret); |
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410 | ret = oauth_params_string(params); |
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411 | oauth_params_free(¶ms); |
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412 | |
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413 | return ret; |
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414 | } |
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415 | |
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416 | struct oauth_info *oauth_from_string(char *in, const struct oauth_service *sp) |
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417 | { |
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418 | struct oauth_info *oi = g_new0(struct oauth_info, 1); |
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419 | GSList *params = NULL; |
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420 | |
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421 | oauth_params_parse(¶ms, in); |
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422 | oi->token = g_strdup(oauth_params_get(¶ms, "oauth_token")); |
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423 | oi->token_secret = g_strdup(oauth_params_get(¶ms, "oauth_token_secret")); |
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424 | oauth_params_free(¶ms); |
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425 | oi->sp = sp; |
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426 | |
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427 | return oi; |
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428 | } |
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