Mercurial > prosody-modules

annotate mod_auth_dovecot/mod_auth_dovecot.lua @ 338:6560fd0b77f5

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mod_auth_dovecot: One mechanism per MECH command.
author Kim Alvefur <zash@zash.se>
date Sun, 13 Feb 2011 23:29:05 +0100
parents 31deafcbf623
children 5aa8229e8815
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1 -- Dovecot authentication backend for Prosody
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2 --
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3 -- Copyright (C) 2010 Javier Torres
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4 -- Copyright (C) 2008-2010 Matthew Wild
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5 -- Copyright (C) 2008-2010 Waqas Hussain
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6 --
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7
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8 local socket_unix = require "socket.unix";
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9 local datamanager = require "util.datamanager";
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10 local usermanager = require "core.usermanager";
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11 local log = require "util.logger".init("auth_dovecot");
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12 local new_sasl = require "util.sasl".new;
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13 local nodeprep = require "util.encodings".stringprep.nodeprep;
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14 local base64 = require "util.encodings".base64;
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15 local pposix = require "util.pposix";
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16
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17 local prosody = prosody;
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18 local socket_path = module:get_option_string("dovecot_auth_socket", "/var/run/dovecot/auth-login");
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19
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20 function new_provider(host)
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21 local provider = { name = "dovecot", request_id = 0 };
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22 log("debug", "initializing dovecot authentication provider for host '%s'", host);
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23
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24 local conn;
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25
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26 -- Closes the socket
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27 function provider.close(self)
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28 if conn then
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29 conn:close();
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30 conn = nil;
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31 end
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32 end
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33
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34 -- The following connects to a new socket and send the handshake
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35 function provider.connect(self)
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36 -- Destroy old socket
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37 provider:close();
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38
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39 conn = socket.unix();
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40
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41 -- Create a connection to dovecot socket
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42 log("debug", "connecting to dovecot socket at '%s'", socket_path);
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43 local ok, err = conn:connect(socket_path);
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44 if not ok then
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45 log("error", "error connecting to dovecot socket at '%s'. error was '%s'. check permissions", socket_path, err);
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46 provider:close();
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47 return false;
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48 end
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49
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50 -- Send our handshake
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51 local pid = pposix.getpid();
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52 log("debug", "sending handshake to dovecot. version 1.1, cpid '%d'", pid);
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53 if not provider:send("VERSION\t1\t1\n") then
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54 return false
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55 end
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56 if not provider:send("CPID\t" .. pid .. "\n") then
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57 return false
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58 end
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59
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60 -- Parse Dovecot's handshake
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61 local done = false;
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62 while (not done) do
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63 local line = provider:receive();
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64 if not line then
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65 return false;
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66 end
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67
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68 log("debug", "dovecot handshake: '%s'", line);
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69 local parts = line:gmatch("[^\t]+");
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70 local first = parts();
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71 if first == "VERSION" then
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72 -- Version should be 1.1
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73 local major_version = parts();
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74
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75 if major_version ~= "1" then
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76 log("error", "dovecot server version is not 1.x. it is %s.x", major_version);
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77 provider:close();
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78 return false;
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79 end
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80 elseif first == "MECH" then
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81 local mech = parts();
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82 supported_mechs[mech] = true;
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83 elseif first == "DONE" then
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84 -- We need PLAIN
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85 if not supported_mechs.PLAIN then
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86 log("warn", "server doesn't support PLAIN mechanism.");
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87 provider:close();
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88 return false;
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89 end
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90 done = true;
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91 end
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92 end
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93 return true;
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94 end
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95
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96 -- Wrapper for send(). Handles errors
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97 function provider.send(self, data)
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98 local ok, err = conn:send(data);
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99 if not ok then
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100 log("error", "error sending '%s' to dovecot. error was '%s'", data, err);
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101 provider:close();
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102 return false;
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103 end
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104 return true;
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105 end
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106
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107 -- Wrapper for receive(). Handles errors
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108 function provider.receive(self)
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109 local line, err = conn:receive();
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110 if not line then
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111 log("error", "error receiving data from dovecot. error was '%s'", err);
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112 provider:close();
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113 return false;
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114 end
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115 return line;
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116 end
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117
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118 function provider.send_auth_request(self, username, password)
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119 if not conn then
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120 if not provider:connect() then
269
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121 return nil, "Auth failed. Dovecot communications error";
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122 end
268
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123 end
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124
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125 -- Send auth data
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126 username = username .. "@" .. module.host; -- FIXME: this is actually a hack for my server
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127 local b64 = base64.encode(username .. "\0" .. username .. "\0" .. password);
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128 provider.request_id = provider.request_id + 1 % 4294967296
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129
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130 local msg = "AUTH\t" .. provider.request_id .. "\tPLAIN\tservice=XMPP\tresp=" .. b64;
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131 log("debug", "sending auth request for '%s' with password '%s': '%s'", username, password, msg);
312
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132 if not provider:send(msg .. "\n") then
268
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133 return nil, "Auth failed. Dovecot communications error";
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134 end
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135
272
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136
268
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137 -- Get response
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138 local line = provider:receive();
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139 log("debug", "got auth response: '%s'", line);
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140 if not line then
268
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141 return nil, "Auth failed. Dovecot communications error";
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142 end
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143 local parts = line:gmatch("[^\t]+");
268
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144
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145 -- Check response
273
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146 local status = parts();
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147 local resp_id = tonumber(parts());
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148
312
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149 if resp_id ~= provider.request_id then
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150 log("warn", "dovecot response_id(%s) doesn't match request_id(%s)", resp_id, provider.request_id);
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151 provider:close();
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152 return nil, "Auth failed. Dovecot communications error";
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153 end
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154
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155 return status, parts;
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156 end
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157
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158 function provider.test_password(username, password)
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159 log("debug", "test password '%s' for user %s at host %s", password, username, module.host);
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160
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161 local status, extra = provider:send_auth_request(username, password);
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162
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163 if status == "OK" then
273
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164 log("info", "login ok for '%s'", username);
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165 return true;
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166 else
273
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167 log("info", "login failed for '%s'", username);
261
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168 return nil, "Auth failed. Invalid username or password.";
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169 end
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170 end
269
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171
261
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172 function provider.get_password(username)
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173 return nil, "Cannot get_password in dovecot backend.";
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174 end
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175
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176 function provider.set_password(username, password)
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177 return nil, "Cannot set_password in dovecot backend.";
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178 end
269
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179
261
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180 function provider.user_exists(username)
274
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181 log("debug", "user_exists for user %s at host %s", username, module.host);
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182
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183 -- Send a request. If the response (FAIL) contains an extra
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184 -- parameter like user=<username> then it exists.
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diff changeset
185 local status, extra = provider:send_auth_request(username, "");
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186
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187 local param = extra();
312
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188 while param do
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189 local parts = param:gmatch("[^=]+");
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diff changeset
190 local name = parts();
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191 local value = parts();
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192 if name == "user" then
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193 log("debug", "user '%s' exists", username);
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194 return true;
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195 end
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196
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197 param = extra();
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198 end
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199
312
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diff changeset
200 log("debug", "user '%s' does not exists (or dovecot didn't send user=<username> parameter)", username);
274
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diff changeset
201 return false;
261
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202 end
269
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diff changeset
203
261
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204 function provider.create_user(username, password)
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205 return nil, "Cannot create_user in dovecot backend.";
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206 end
269
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diff changeset
207
261
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208 function provider.get_sasl_handler()
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209 local realm = module:get_option("sasl_realm") or module.host;
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diff changeset
210 local getpass_authentication_profile = {
305
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diff changeset
211 plain_test = function(sasl, username, password, realm)
268
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diff changeset
212 local prepped_username = nodeprep(username);
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diff changeset
213 if not prepped_username then
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diff changeset
214 log("debug", "NODEprep failed on username: %s", username);
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diff changeset
215 return "", nil;
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diff changeset
216 end
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diff changeset
217 return usermanager.test_password(prepped_username, realm, password), true;
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diff changeset
218 end
269
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diff changeset
219 };
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diff changeset
220 return new_sasl(realm, getpass_authentication_profile);
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diff changeset
221 end
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diff changeset
222
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diff changeset
223 return provider;
261
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224 end
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diff changeset
225
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diff changeset
226 module:add_item("auth-provider", new_provider(module.host));