prosody-modules
77ca0947647b
mod_auth_dovecot/mod_auth_dovecot.lua

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mod_auth_dovecot/mod_auth_dovecot.lua @ 395:77ca0947647b

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author leonbogaert@gmail.com
date Tue, 26 Jul 2011 13:19:09 +0000
parent 342:8e9e5c7d97ff
child 410:abac17cb5032
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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 sha1 = require "util.hashes".sha1;
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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 -- Generate an id for this connection (must be a 31-bit number, unique per process)
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26 local pid = tonumber(sha1(host, true):sub(1, 6), 16);
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27
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28 -- Closes the socket
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29 function provider.close(self)
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30 if conn then
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31 conn:close();
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32 conn = nil;
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33 end
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34 end
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35
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36 -- The following connects to a new socket and send the handshake
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37 function provider.connect(self)
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38 -- Destroy old socket
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39 provider:close();
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40
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41 conn = socket.unix();
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42
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43 -- Create a connection to dovecot socket
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44 log("debug", "connecting to dovecot socket at '%s'", socket_path);
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45 local ok, err = conn:connect(socket_path);
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46 if not ok then
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47 log("error", "error connecting to dovecot socket at '%s'. error was '%s'. check permissions", socket_path, err);
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48 provider:close();
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49 return false;
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50 end
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51
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52 -- Send our handshake
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53 log("debug", "sending handshake to dovecot. version 1.1, cpid '%d'", pid);
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54 if not provider:send("VERSION\t1\t1\n") then
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55 return false
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56 end
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57 if not provider:send("CPID\t" .. pid .. "\n") then
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58 return false
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59 end
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60
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61 -- Parse Dovecot's handshake
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62 local done = false;
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63 local supported_mechs = {};
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64 while (not done) do
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65 local line = provider:receive();
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66 if not line then
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67 return false;
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68 end
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69
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70 log("debug", "dovecot handshake: '%s'", line);
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71 local parts = line:gmatch("[^\t]+");
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72 local first = parts();
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73 if first == "VERSION" then
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74 -- Version should be 1.1
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75 local major_version = parts();
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76
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77 if major_version ~= "1" then
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78 log("error", "dovecot server version is not 1.x. it is %s.x", major_version);
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79 provider:close();
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80 return false;
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81 end
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82 elseif first == "MECH" then
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83 local mech = parts();
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84 supported_mechs[mech] = true;
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85 elseif first == "DONE" then
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86 -- We need PLAIN
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87 if not supported_mechs.PLAIN then
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88 log("warn", "server doesn't support PLAIN mechanism.");
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89 provider:close();
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90 return false;
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91 end
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92 done = true;
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93 end
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94 end
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95 return true;
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96 end
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97
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98 -- Wrapper for send(). Handles errors
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99 function provider.send(self, data)
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100 local ok, err = conn:send(data);
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101 if not ok then
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102 log("error", "error sending '%s' to dovecot. error was '%s'", data, err);
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103 provider:close();
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104 return false;
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105 end
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106 return true;
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107 end
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108
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109 -- Wrapper for receive(). Handles errors
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110 function provider.receive(self)
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111 local line, err = conn:receive();
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112 if not line then
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113 log("error", "error receiving data from dovecot. error was '%s'", err);
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114 provider:close();
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115 return false;
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116 end
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117 return line;
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118 end
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119
274
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120 function provider.send_auth_request(self, username, password)
310
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121 if not conn then
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122 if not provider:connect() then
269
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123 return nil, "Auth failed. Dovecot communications error";
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124 end
268
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125 end
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126
261
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127 -- Send auth data
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128 username = username .. "@" .. module.host; -- FIXME: this is actually a hack for my server
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129 local b64 = base64.encode(username .. "\0" .. username .. "\0" .. password);
273
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130 provider.request_id = provider.request_id + 1 % 4294967296
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131
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132 local msg = "AUTH\t" .. provider.request_id .. "\tPLAIN\tservice=XMPP\tresp=" .. b64;
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133 log("debug", "sending auth request for '%s' with password '%s': '%s'", username, password, msg);
312
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134 if not provider:send(msg .. "\n") then
268
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135 return nil, "Auth failed. Dovecot communications error";
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136 end
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137
272
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138
268
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139 -- Get response
312
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140 local line = provider:receive();
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141 log("debug", "got auth response: '%s'", line);
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142 if not line then
268
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143 return nil, "Auth failed. Dovecot communications error";
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144 end
312
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145 local parts = line:gmatch("[^\t]+");
268
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146
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147 -- Check response
273
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148 local status = parts();
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149 local resp_id = tonumber(parts());
274
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150
312
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151 if resp_id ~= provider.request_id then
273
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152 log("warn", "dovecot response_id(%s) doesn't match request_id(%s)", resp_id, provider.request_id);
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153 provider:close();
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154 return nil, "Auth failed. Dovecot communications error";
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155 end
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156
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157 return status, parts;
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158 end
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159
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160 function provider.test_password(username, password)
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161 log("debug", "test password '%s' for user %s at host %s", password, username, module.host);
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162
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163 local status, extra = provider:send_auth_request(username, password);
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164
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165 if status == "OK" then
273
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166 log("info", "login ok for '%s'", username);
261
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167 return true;
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168 else
273
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169 log("info", "login failed for '%s'", username);
261
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170 return nil, "Auth failed. Invalid username or password.";
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171 end
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172 end
269
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173
261
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174 function provider.get_password(username)
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175 return nil, "Cannot get_password in dovecot backend.";
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176 end
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177
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178 function provider.set_password(username, password)
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179 return nil, "Cannot set_password in dovecot backend.";
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180 end
269
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diff changeset
181
261
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182 function provider.user_exists(username)
274
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diff changeset
183 log("debug", "user_exists for user %s at host %s", username, module.host);
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184
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diff changeset
185 -- Send a request. If the response (FAIL) contains an extra
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186 -- parameter like user=<username> then it exists.
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187 local status, extra = provider:send_auth_request(username, "");
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188
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diff changeset
189 local param = extra();
312
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diff changeset
190 while param do
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191 local parts = param:gmatch("[^=]+");
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diff changeset
192 local name = parts();
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diff changeset
193 local value = parts();
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diff changeset
194 if name == "user" then
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diff changeset
195 log("debug", "user '%s' exists", username);
274
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196 return true;
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diff changeset
197 end
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198
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diff changeset
199 param = extra();
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200 end
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diff changeset
201
312
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diff changeset
202 log("debug", "user '%s' does not exists (or dovecot didn't send user=<username> parameter)", username);
274
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diff changeset
203 return false;
261
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204 end
269
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diff changeset
205
261
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diff changeset
206 function provider.create_user(username, password)
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207 return nil, "Cannot create_user in dovecot backend.";
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208 end
269
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diff changeset
209
261
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210 function provider.get_sasl_handler()
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diff changeset
211 local getpass_authentication_profile = {
305
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diff changeset
212 plain_test = function(sasl, username, password, realm)
268
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diff changeset
213 local prepped_username = nodeprep(username);
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diff changeset
214 if not prepped_username then
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diff changeset
215 log("debug", "NODEprep failed on username: %s", username);
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diff changeset
216 return "", nil;
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diff changeset
217 end
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diff changeset
218 return usermanager.test_password(prepped_username, realm, password), true;
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diff changeset
219 end
269
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diff changeset
220 };
342
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parents: 340
diff changeset
221 return new_sasl(module.host, getpass_authentication_profile);
269
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diff changeset
222 end
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diff changeset
223
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diff changeset
224 return provider;
261
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diff changeset
225 end
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226
312
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diff changeset
227 module:add_item("auth-provider", new_provider(module.host));