1 | /* |
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2 | * Family 0x0017 - Authentication. |
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3 | * |
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4 | * Deals with the authorizer for SNAC-based login, and also old-style |
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5 | * non-SNAC login. |
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6 | * |
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7 | */ |
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8 | |
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9 | #define FAIM_INTERNAL |
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10 | #include <aim.h> |
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11 | |
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12 | #include "md5.h" |
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13 | |
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14 | static int aim_encode_password(const char *password, fu8_t *encoded); |
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15 | |
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16 | /* |
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17 | * This just pushes the passed cookie onto the passed connection, without |
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18 | * the SNAC header or any of that. |
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19 | * |
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20 | * Very commonly used, as every connection except auth will require this to |
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21 | * be the first thing you send. |
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22 | * |
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23 | */ |
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24 | faim_export int aim_sendcookie(aim_session_t *sess, aim_conn_t *conn, const fu16_t length, const fu8_t *chipsahoy) |
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25 | { |
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26 | aim_frame_t *fr; |
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27 | aim_tlvlist_t *tl = NULL; |
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28 | |
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29 | if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x0001, 4+2+2+length))) |
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30 | return -ENOMEM; |
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31 | |
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32 | aimbs_put32(&fr->data, 0x00000001); |
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33 | aim_addtlvtochain_raw(&tl, 0x0006, length, chipsahoy); |
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34 | aim_writetlvchain(&fr->data, &tl); |
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35 | aim_freetlvchain(&tl); |
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36 | |
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37 | aim_tx_enqueue(sess, fr); |
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38 | |
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39 | return 0; |
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40 | } |
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41 | |
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42 | /* |
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43 | * Normally the FLAP version is sent as the first few bytes of the cookie, |
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44 | * meaning you generally never call this. |
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45 | * |
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46 | * But there are times when something might want it seperate. Specifically, |
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47 | * libfaim sends this internally when doing SNAC login. |
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48 | * |
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49 | */ |
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50 | faim_export int aim_sendflapver(aim_session_t *sess, aim_conn_t *conn) |
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51 | { |
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52 | aim_frame_t *fr; |
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53 | |
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54 | if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x01, 4))) |
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55 | return -ENOMEM; |
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56 | |
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57 | aimbs_put32(&fr->data, 0x00000001); |
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58 | |
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59 | aim_tx_enqueue(sess, fr); |
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60 | |
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61 | return 0; |
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62 | } |
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63 | |
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64 | /* |
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65 | * This is a bit confusing. |
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66 | * |
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67 | * Normal SNAC login goes like this: |
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68 | * - connect |
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69 | * - server sends flap version |
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70 | * - client sends flap version |
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71 | * - client sends screen name (17/6) |
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72 | * - server sends hash key (17/7) |
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73 | * - client sends auth request (17/2 -- aim_send_login) |
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74 | * - server yells |
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75 | * |
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76 | * XOR login (for ICQ) goes like this: |
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77 | * - connect |
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78 | * - server sends flap version |
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79 | * - client sends auth request which contains flap version (aim_send_login) |
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80 | * - server yells |
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81 | * |
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82 | * For the client API, we make them implement the most complicated version, |
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83 | * and for the simpler version, we fake it and make it look like the more |
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84 | * complicated process. |
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85 | * |
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86 | * This is done by giving the client a faked key, just so we can convince |
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87 | * them to call aim_send_login right away, which will detect the session |
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88 | * flag that says this is XOR login and ignore the key, sending an ICQ |
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89 | * login request instead of the normal SNAC one. |
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90 | * |
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91 | * As soon as AOL makes ICQ log in the same way as AIM, this is /gone/. |
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92 | * |
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93 | * XXX This may cause problems if the client relies on callbacks only |
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94 | * being called from the context of aim_rxdispatch()... |
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95 | * |
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96 | */ |
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97 | static int goddamnicq(aim_session_t *sess, aim_conn_t *conn, const char *sn) |
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98 | { |
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99 | aim_frame_t fr; |
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100 | aim_rxcallback_t userfunc; |
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101 | |
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102 | sess->flags &= ~AIM_SESS_FLAGS_SNACLOGIN; |
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103 | sess->flags |= AIM_SESS_FLAGS_XORLOGIN; |
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104 | |
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105 | fr.conn = conn; |
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106 | |
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107 | if ((userfunc = aim_callhandler(sess, conn, 0x0017, 0x0007))) |
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108 | userfunc(sess, &fr, ""); |
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109 | |
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110 | return 0; |
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111 | } |
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112 | |
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113 | /* |
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114 | * In AIM 3.5 protocol, the first stage of login is to request login from the |
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115 | * Authorizer, passing it the screen name for verification. If the name is |
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116 | * invalid, a 0017/0003 is spit back, with the standard error contents. If |
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117 | * valid, a 0017/0007 comes back, which is the signal to send it the main |
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118 | * login command (0017/0002). |
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119 | * |
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120 | */ |
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121 | faim_export int aim_request_login(aim_session_t *sess, aim_conn_t *conn, const char *sn) |
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122 | { |
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123 | aim_frame_t *fr; |
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124 | aim_snacid_t snacid; |
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125 | aim_tlvlist_t *tl = NULL; |
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126 | |
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127 | if (!sess || !conn || !sn) |
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128 | return -EINVAL; |
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129 | |
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130 | if ((sn[0] >= '0') && (sn[0] <= '9')) |
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131 | return goddamnicq(sess, conn, sn); |
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132 | |
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133 | sess->flags |= AIM_SESS_FLAGS_SNACLOGIN; |
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134 | |
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135 | aim_sendflapver(sess, conn); |
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136 | |
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137 | if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+2+2+strlen(sn)))) |
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138 | return -ENOMEM; |
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139 | |
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140 | snacid = aim_cachesnac(sess, 0x0017, 0x0006, 0x0000, NULL, 0); |
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141 | aim_putsnac(&fr->data, 0x0017, 0x0006, 0x0000, snacid); |
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142 | |
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143 | aim_addtlvtochain_raw(&tl, 0x0001, strlen(sn), sn); |
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144 | aim_writetlvchain(&fr->data, &tl); |
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145 | aim_freetlvchain(&tl); |
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146 | |
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147 | aim_tx_enqueue(sess, fr); |
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148 | |
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149 | return 0; |
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150 | } |
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151 | |
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152 | /* |
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153 | * Part two of the ICQ hack. Note the ignoring of the key. |
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154 | */ |
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155 | static int goddamnicq2(aim_session_t *sess, aim_conn_t *conn, const char *sn, const char *password, struct client_info_s *ci) |
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156 | { |
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157 | aim_frame_t *fr; |
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158 | aim_tlvlist_t *tl = NULL; |
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159 | int passwdlen; |
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160 | fu8_t *password_encoded; |
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161 | |
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162 | passwdlen = strlen(password); |
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163 | if (!(password_encoded = (char *)malloc(passwdlen+1))) |
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164 | return -ENOMEM; |
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165 | if (passwdlen > MAXICQPASSLEN) |
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166 | passwdlen = MAXICQPASSLEN; |
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167 | |
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168 | if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x01, 1152))) { |
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169 | free(password_encoded); |
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170 | return -ENOMEM; |
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171 | } |
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172 | |
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173 | aim_encode_password(password, password_encoded); |
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174 | |
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175 | aimbs_put32(&fr->data, 0x00000001); /* FLAP Version */ |
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176 | aim_addtlvtochain_raw(&tl, 0x0001, strlen(sn), sn); |
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177 | aim_addtlvtochain_raw(&tl, 0x0002, passwdlen, password_encoded); |
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178 | |
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179 | if (ci->clientstring) |
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180 | aim_addtlvtochain_raw(&tl, 0x0003, strlen(ci->clientstring), ci->clientstring); |
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181 | aim_addtlvtochain16(&tl, 0x0016, (fu16_t)ci->clientid); |
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182 | aim_addtlvtochain16(&tl, 0x0017, (fu16_t)ci->major); |
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183 | aim_addtlvtochain16(&tl, 0x0018, (fu16_t)ci->minor); |
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184 | aim_addtlvtochain16(&tl, 0x0019, (fu16_t)ci->point); |
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185 | aim_addtlvtochain16(&tl, 0x001a, (fu16_t)ci->build); |
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186 | aim_addtlvtochain32(&tl, 0x0014, (fu32_t)ci->distrib); /* distribution chan */ |
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187 | aim_addtlvtochain_raw(&tl, 0x000f, strlen(ci->lang), ci->lang); |
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188 | aim_addtlvtochain_raw(&tl, 0x000e, strlen(ci->country), ci->country); |
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189 | |
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190 | aim_writetlvchain(&fr->data, &tl); |
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191 | |
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192 | free(password_encoded); |
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193 | aim_freetlvchain(&tl); |
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194 | |
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195 | aim_tx_enqueue(sess, fr); |
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196 | |
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197 | return 0; |
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198 | } |
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199 | |
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200 | /* |
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201 | * send_login(int socket, char *sn, char *password) |
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202 | * |
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203 | * This is the initial login request packet. |
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204 | * |
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205 | * NOTE!! If you want/need to make use of the aim_sendmemblock() function, |
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206 | * then the client information you send here must exactly match the |
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207 | * executable that you're pulling the data from. |
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208 | * |
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209 | * Java AIM 1.1.19: |
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210 | * clientstring = "AOL Instant Messenger (TM) version 1.1.19 for Java built 03/24/98, freeMem 215871 totalMem 1048567, i686, Linus, #2 SMP Sun Feb 11 03:41:17 UTC 2001 2.4.1-ac9, IBM Corporation, 1.1.8, 45.3, Tue Mar 27 12:09:17 PST 2001" |
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211 | * clientid = 0x0001 |
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212 | * major = 0x0001 |
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213 | * minor = 0x0001 |
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214 | * point = (not sent) |
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215 | * build = 0x0013 |
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216 | * unknown= (not sent) |
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217 | * |
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218 | * AIM for Linux 1.1.112: |
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219 | * clientstring = "AOL Instant Messenger (SM)" |
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220 | * clientid = 0x1d09 |
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221 | * major = 0x0001 |
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222 | * minor = 0x0001 |
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223 | * point = 0x0001 |
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224 | * build = 0x0070 |
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225 | * unknown= 0x0000008b |
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226 | * serverstore = 0x01 |
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227 | * |
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228 | */ |
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229 | faim_export int aim_send_login(aim_session_t *sess, aim_conn_t *conn, const char *sn, const char *password, struct client_info_s *ci, const char *key) |
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230 | { |
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231 | aim_frame_t *fr; |
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232 | aim_tlvlist_t *tl = NULL; |
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233 | fu8_t digest[16]; |
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234 | aim_snacid_t snacid; |
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235 | |
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236 | if (!ci || !sn || !password) |
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237 | return -EINVAL; |
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238 | |
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239 | /* |
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240 | * What the XORLOGIN flag _really_ means is that its an ICQ login, |
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241 | * which is really stupid and painful, so its not done here. |
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242 | * |
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243 | */ |
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244 | if (sess->flags & AIM_SESS_FLAGS_XORLOGIN) |
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245 | return goddamnicq2(sess, conn, sn, password, ci); |
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246 | |
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247 | |
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248 | if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 1152))) |
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249 | return -ENOMEM; |
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250 | |
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251 | snacid = aim_cachesnac(sess, 0x0017, 0x0002, 0x0000, NULL, 0); |
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252 | aim_putsnac(&fr->data, 0x0017, 0x0002, 0x0000, snacid); |
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253 | |
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254 | aim_addtlvtochain_raw(&tl, 0x0001, strlen(sn), sn); |
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255 | |
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256 | aim_encode_password_md5(password, key, digest); |
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257 | aim_addtlvtochain_raw(&tl, 0x0025, 16, digest); |
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258 | |
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259 | /* |
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260 | * Newer versions of winaim have an empty type x004c TLV here. |
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261 | */ |
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262 | |
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263 | if (ci->clientstring) |
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264 | aim_addtlvtochain_raw(&tl, 0x0003, strlen(ci->clientstring), ci->clientstring); |
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265 | aim_addtlvtochain16(&tl, 0x0016, (fu16_t)ci->clientid); |
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266 | aim_addtlvtochain16(&tl, 0x0017, (fu16_t)ci->major); |
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267 | aim_addtlvtochain16(&tl, 0x0018, (fu16_t)ci->minor); |
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268 | aim_addtlvtochain16(&tl, 0x0019, (fu16_t)ci->point); |
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269 | aim_addtlvtochain16(&tl, 0x001a, (fu16_t)ci->build); |
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270 | aim_addtlvtochain32(&tl, 0x0014, (fu32_t)ci->distrib); |
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271 | aim_addtlvtochain_raw(&tl, 0x000e, strlen(ci->country), ci->country); |
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272 | aim_addtlvtochain_raw(&tl, 0x000f, strlen(ci->lang), ci->lang); |
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273 | |
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274 | #ifndef NOSSI |
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275 | /* |
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276 | * If set, old-fashioned buddy lists will not work. You will need |
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277 | * to use SSI. |
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278 | */ |
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279 | aim_addtlvtochain8(&tl, 0x004a, 0x01); |
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280 | #endif |
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281 | |
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282 | aim_writetlvchain(&fr->data, &tl); |
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283 | |
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284 | aim_freetlvchain(&tl); |
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285 | |
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286 | aim_tx_enqueue(sess, fr); |
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287 | |
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288 | return 0; |
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289 | } |
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290 | |
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291 | faim_export int aim_encode_password_md5(const char *password, const char *key, fu8_t *digest) |
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292 | { |
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293 | md5_state_t state; |
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294 | |
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295 | md5_init(&state); |
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296 | md5_append(&state, (const md5_byte_t *)key, strlen(key)); |
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297 | md5_append(&state, (const md5_byte_t *)password, strlen(password)); |
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298 | md5_append(&state, (const md5_byte_t *)AIM_MD5_STRING, strlen(AIM_MD5_STRING)); |
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299 | md5_finish(&state, (md5_byte_t *)digest); |
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300 | |
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301 | return 0; |
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302 | } |
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303 | |
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304 | /** |
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305 | * aim_encode_password - Encode a password using old XOR method |
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306 | * @password: incoming password |
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307 | * @encoded: buffer to put encoded password |
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308 | * |
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309 | * This takes a const pointer to a (null terminated) string |
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310 | * containing the unencoded password. It also gets passed |
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311 | * an already allocated buffer to store the encoded password. |
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312 | * This buffer should be the exact length of the password without |
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313 | * the null. The encoded password buffer /is not %NULL terminated/. |
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314 | * |
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315 | * The encoding_table seems to be a fixed set of values. We'll |
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316 | * hope it doesn't change over time! |
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317 | * |
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318 | * This is only used for the XOR method, not the better MD5 method. |
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319 | * |
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320 | */ |
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321 | static int aim_encode_password(const char *password, fu8_t *encoded) |
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322 | { |
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323 | fu8_t encoding_table[] = { |
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324 | #if 0 /* old v1 table */ |
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325 | 0xf3, 0xb3, 0x6c, 0x99, |
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326 | 0x95, 0x3f, 0xac, 0xb6, |
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327 | 0xc5, 0xfa, 0x6b, 0x63, |
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328 | 0x69, 0x6c, 0xc3, 0x9f |
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329 | #else /* v2.1 table, also works for ICQ */ |
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330 | 0xf3, 0x26, 0x81, 0xc4, |
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331 | 0x39, 0x86, 0xdb, 0x92, |
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332 | 0x71, 0xa3, 0xb9, 0xe6, |
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333 | 0x53, 0x7a, 0x95, 0x7c |
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334 | #endif |
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335 | }; |
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336 | int i; |
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337 | |
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338 | for (i = 0; i < strlen(password); i++) |
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339 | encoded[i] = (password[i] ^ encoding_table[i]); |
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340 | |
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341 | return 0; |
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342 | } |
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343 | |
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344 | /* |
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345 | * This is sent back as a general response to the login command. |
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346 | * It can be either an error or a success, depending on the |
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347 | * precense of certain TLVs. |
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348 | * |
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349 | * The client should check the value passed as errorcode. If |
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350 | * its nonzero, there was an error. |
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351 | * |
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352 | */ |
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353 | static int parse(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs) |
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354 | { |
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355 | aim_tlvlist_t *tlvlist; |
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356 | aim_rxcallback_t userfunc; |
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357 | struct aim_authresp_info *info; |
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358 | int ret = 0; |
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359 | |
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360 | info = (struct aim_authresp_info *)malloc(sizeof(struct aim_authresp_info)); |
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361 | memset(info, 0, sizeof(struct aim_authresp_info)); |
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362 | |
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363 | /* |
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364 | * Read block of TLVs. All further data is derived |
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365 | * from what is parsed here. |
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366 | */ |
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367 | tlvlist = aim_readtlvchain(bs); |
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368 | |
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369 | /* |
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370 | * No matter what, we should have a screen name. |
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371 | */ |
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372 | memset(sess->sn, 0, sizeof(sess->sn)); |
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373 | if (aim_gettlv(tlvlist, 0x0001, 1)) { |
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374 | info->sn = aim_gettlv_str(tlvlist, 0x0001, 1); |
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375 | strncpy(sess->sn, info->sn, sizeof(sess->sn)); |
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376 | } |
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377 | |
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378 | /* |
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379 | * Check for an error code. If so, we should also |
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380 | * have an error url. |
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381 | */ |
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382 | if (aim_gettlv(tlvlist, 0x0008, 1)) |
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383 | info->errorcode = aim_gettlv16(tlvlist, 0x0008, 1); |
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384 | if (aim_gettlv(tlvlist, 0x0004, 1)) |
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385 | info->errorurl = aim_gettlv_str(tlvlist, 0x0004, 1); |
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386 | |
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387 | /* |
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388 | * BOS server address. |
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389 | */ |
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390 | if (aim_gettlv(tlvlist, 0x0005, 1)) |
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391 | info->bosip = aim_gettlv_str(tlvlist, 0x0005, 1); |
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392 | |
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393 | /* |
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394 | * Authorization cookie. |
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395 | */ |
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396 | if (aim_gettlv(tlvlist, 0x0006, 1)) { |
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397 | aim_tlv_t *tmptlv; |
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398 | |
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399 | tmptlv = aim_gettlv(tlvlist, 0x0006, 1); |
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400 | |
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401 | info->cookielen = tmptlv->length; |
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402 | info->cookie = tmptlv->value; |
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403 | } |
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404 | |
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405 | /* |
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406 | * The email address attached to this account |
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407 | * Not available for ICQ or @mac.com logins. |
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408 | * If you receive this TLV, then you are allowed to use |
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409 | * family 0x0018 to check the status of your email. |
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410 | * XXX - Not really true! |
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411 | */ |
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412 | if (aim_gettlv(tlvlist, 0x0011, 1)) |
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413 | info->email = aim_gettlv_str(tlvlist, 0x0011, 1); |
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414 | |
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415 | /* |
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416 | * The registration status. (Not real sure what it means.) |
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417 | * Not available for ICQ or @mac.com logins. |
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418 | * |
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419 | * 1 = No disclosure |
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420 | * 2 = Limited disclosure |
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421 | * 3 = Full disclosure |
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422 | * |
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423 | * This has to do with whether your email address is available |
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424 | * to other users or not. AFAIK, this feature is no longer used. |
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425 | * |
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426 | * Means you can use the admin family? (0x0007) |
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427 | * |
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428 | */ |
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429 | if (aim_gettlv(tlvlist, 0x0013, 1)) |
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430 | info->regstatus = aim_gettlv16(tlvlist, 0x0013, 1); |
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431 | |
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432 | if (aim_gettlv(tlvlist, 0x0040, 1)) |
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433 | info->latestbeta.build = aim_gettlv32(tlvlist, 0x0040, 1); |
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434 | if (aim_gettlv(tlvlist, 0x0041, 1)) |
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435 | info->latestbeta.url = aim_gettlv_str(tlvlist, 0x0041, 1); |
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436 | if (aim_gettlv(tlvlist, 0x0042, 1)) |
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437 | info->latestbeta.info = aim_gettlv_str(tlvlist, 0x0042, 1); |
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438 | if (aim_gettlv(tlvlist, 0x0043, 1)) |
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439 | info->latestbeta.name = aim_gettlv_str(tlvlist, 0x0043, 1); |
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440 | if (aim_gettlv(tlvlist, 0x0048, 1)) |
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441 | ; /* no idea what this is */ |
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442 | |
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443 | if (aim_gettlv(tlvlist, 0x0044, 1)) |
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444 | info->latestrelease.build = aim_gettlv32(tlvlist, 0x0044, 1); |
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445 | if (aim_gettlv(tlvlist, 0x0045, 1)) |
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446 | info->latestrelease.url = aim_gettlv_str(tlvlist, 0x0045, 1); |
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447 | if (aim_gettlv(tlvlist, 0x0046, 1)) |
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448 | info->latestrelease.info = aim_gettlv_str(tlvlist, 0x0046, 1); |
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449 | if (aim_gettlv(tlvlist, 0x0047, 1)) |
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450 | info->latestrelease.name = aim_gettlv_str(tlvlist, 0x0047, 1); |
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451 | if (aim_gettlv(tlvlist, 0x0049, 1)) |
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452 | ; /* no idea what this is */ |
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453 | |
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454 | /* |
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455 | * URL to change password. |
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456 | */ |
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457 | if (aim_gettlv(tlvlist, 0x0054, 1)) |
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458 | info->chpassurl = aim_gettlv_str(tlvlist, 0x0054, 1); |
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459 | |
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460 | /* |
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461 | * Unknown. Seen on an @mac.com screen name with value of 0x003f |
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462 | */ |
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463 | if (aim_gettlv(tlvlist, 0x0055, 1)) |
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464 | ; |
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465 | |
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466 | sess->authinfo = info; |
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467 | |
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468 | if ((userfunc = aim_callhandler(sess, rx->conn, snac ? snac->family : 0x0017, snac ? snac->subtype : 0x0003))) |
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469 | ret = userfunc(sess, rx, info); |
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470 | |
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471 | aim_freetlvchain(&tlvlist); |
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472 | |
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473 | return ret; |
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474 | } |
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475 | |
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476 | /* |
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477 | * Middle handler for 0017/0007 SNACs. Contains the auth key prefixed |
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478 | * by only its length in a two byte word. |
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479 | * |
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480 | * Calls the client, which should then use the value to call aim_send_login. |
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481 | * |
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482 | */ |
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483 | static int keyparse(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs) |
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484 | { |
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485 | int keylen, ret = 1; |
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486 | aim_rxcallback_t userfunc; |
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487 | char *keystr; |
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488 | |
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489 | keylen = aimbs_get16(bs); |
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490 | keystr = aimbs_getstr(bs, keylen); |
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491 | |
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492 | /* XXX - When GiantGrayPanda signed on AIM I got a thing asking me to register |
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493 | * for the netscape network. This SNAC had a type 0x0058 TLV with length 10. |
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494 | * Data is 0x0007 0004 3e19 ae1e 0006 0004 0000 0005 */ |
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495 | |
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496 | if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) |
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497 | ret = userfunc(sess, rx, keystr); |
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498 | |
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499 | free(keystr); |
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500 | |
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501 | return ret; |
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502 | } |
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503 | |
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504 | static void auth_shutdown(aim_session_t *sess, aim_module_t *mod) |
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505 | { |
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506 | if (sess->authinfo) { |
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507 | free(sess->authinfo->sn); |
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508 | free(sess->authinfo->bosip); |
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509 | free(sess->authinfo->errorurl); |
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510 | free(sess->authinfo->email); |
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511 | free(sess->authinfo->chpassurl); |
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512 | free(sess->authinfo->latestrelease.name); |
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513 | free(sess->authinfo->latestrelease.url); |
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514 | free(sess->authinfo->latestrelease.info); |
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515 | free(sess->authinfo->latestbeta.name); |
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516 | free(sess->authinfo->latestbeta.url); |
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517 | free(sess->authinfo->latestbeta.info); |
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518 | free(sess->authinfo); |
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519 | } |
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520 | } |
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521 | |
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522 | static int snachandler(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs) |
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523 | { |
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524 | |
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525 | if (snac->subtype == 0x0003) |
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526 | return parse(sess, mod, rx, snac, bs); |
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527 | else if (snac->subtype == 0x0007) |
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528 | return keyparse(sess, mod, rx, snac, bs); |
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529 | |
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530 | return 0; |
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531 | } |
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532 | |
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533 | faim_internal int auth_modfirst(aim_session_t *sess, aim_module_t *mod) |
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534 | { |
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535 | |
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536 | mod->family = 0x0017; |
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537 | mod->version = 0x0000; |
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538 | mod->flags = 0; |
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539 | strncpy(mod->name, "auth", sizeof(mod->name)); |
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540 | mod->snachandler = snachandler; |
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541 | mod->shutdown = auth_shutdown; |
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542 | |
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543 | return 0; |
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544 | } |
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