annotate mod_auth_dovecot/mod_auth_dovecot.lua @ 268:cfcd4efb0fa4

mod_auth_dovecot: Remove asserts (use logger) and refactor socket code
author Javier Torres <javitonino@gmail.com>
date Sat, 30 Oct 2010 23:38:39 +0200
parents 76f3310ec113
children 74846ec9c29f
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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 log = require "util.logger".init("auth_internal_plain");
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11 local new_sasl = require "util.sasl".new;
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12 local nodeprep = require "util.encodings".stringprep.nodeprep;
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13 local base64 = require "util.encodings".base64;
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14 local pposix = require "util.pposix";
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15
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16 local prosody = _G.prosody;
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17
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18 function new_default_provider(host)
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19 local provider = { name = "dovecot", c = nil };
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20 log("debug", "initializing dovecot authentication provider for host '%s'", host);
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21
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22 -- The following connects to a new socket and send the handshake
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23 function provider.connect(self)
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24 -- Destroy old socket
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25 if (provider.c ~= nil) then
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26 provider.c:close();
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27 end
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28
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29 provider.c = socket.unix();
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30
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31 -- Create a connection to dovecot socket
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32 local socket = "/var/run/dovecot/auth-login";
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33 local r, e = provider.c:connect(socket);
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34 if (not r) then
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35 log("warn", "error connecting to dovecot socket at '%s'. error was '%s'. check permissions", socket, e);
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36 return false;
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37 end
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38
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39 -- Send our handshake
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40 local pid = pposix.getpid();
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41 if not provider:send("VERSION\t1\t1\n") then
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42 return false
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43 end
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44 if (not provider:send("CPID\t" .. pid .. "\n")) then
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45 return false
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46 end
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47
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48 -- Parse Dovecot's handshake
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49 local done = false;
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50 while (not done) do
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51 local l = provider:receive();
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52 if (not l) then
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53 return false;
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54 end
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55
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56 parts = string.gmatch(l, "[^\t]+");
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57 first = parts();
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58 if (first == "VERSION") then
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59 -- Version should be 1.1
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60 local v1 = parts();
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61 local v2 = parts();
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62
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63 if (not (v1 == "1" and v2 == "1")) then
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64 log("warn", "server version is not 1.1. it is %s.%s", v1, v2);
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65 return false;
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66 end
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67 elseif (first == "MECH") then
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68 -- Mechanisms should include PLAIN
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69 local ok = false;
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70 for p in parts do
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71 if p == "PLAIN" then
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72 ok = true;
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73 end
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74 end
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75 if (not ok) then
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76 log("warn", "server doesn't support PLAIN mechanism. It supports '%s'", l);
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77 return false;
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78 end
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79 elseif (first == "DONE") then
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80 done = true;
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81 end
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82 end
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83 return true;
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84 end
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85
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86 function provider.send(self, data)
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87 local r, e = provider.c:send(data);
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88 if (not r) then
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89 log("warn", "error sending '%s' to dovecot. error was '%s'", data, e);
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90 return false;
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91 end
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92 return true;
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93 end
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94
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95 function provider.receive(self)
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96 local r, e = provider.c:receive();
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97 if (not r) then
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98 log("warn", "error receiving data from dovecot. error was '%s'", socket, e);
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99 return false;
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100 end
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101 return r;
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102 end
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103
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104 function provider.test_password(username, password)
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105 log("debug", "test password '%s' for user %s at host %s", password, username, module.host);
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106
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107 if (not provider:connect()) then
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108 return nil, "Auth failed. Dovecot communications error";
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109 end
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110
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111 -- Send auth data
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112 username = username .. "@" .. module.host; -- FIXME: this is actually a hack for my server
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113 local b64 = base64.encode(username .. "\0" .. username .. "\0" .. password);
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114 local id = "54321"; -- FIXME: probably can just be a fixed value if making one request per connection
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115 if (not provider:send("AUTH\t" .. id .. "\tPLAIN\tservice=XMPP\tresp=" .. b64 .. "\n")) then
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116 return nil, "Auth failed. Dovecot communications error";
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117 end
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118
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119 -- Get response
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120 local l = provider:receive();
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121 if (not l) then
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122 return nil, "Auth failed. Dovecot communications error";
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123 end
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124 local parts = string.gmatch(l, "[^\t]+");
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125
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126 -- Check response
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127 if (parts() == "OK") then
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128 return true;
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129 else
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130 return nil, "Auth failed. Invalid username or password.";
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131 end
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132 end
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133
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134 function provider.get_password(username)
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135 return nil, "Cannot get_password in dovecot backend.";
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136 end
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137
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138 function provider.set_password(username, password)
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139 return nil, "Cannot set_password in dovecot backend.";
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140 end
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141
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142 function provider.user_exists(username)
268
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143 --TODO: Send an auth request. If it returns FAIL <id> user=<user> then user exists.
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144 return nil, "user_exists not yet implemented in dovecot backend.";
261
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145 end
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146
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147 function provider.create_user(username, password)
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148 return nil, "Cannot create_user in dovecot backend.";
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149 end
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150
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151 function provider.get_sasl_handler()
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152 local realm = module:get_option("sasl_realm") or module.host;
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153 local getpass_authentication_profile = {
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154 plain_test = function(username, password, realm)
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155 local prepped_username = nodeprep(username);
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156 if not prepped_username then
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157 log("debug", "NODEprep failed on username: %s", username);
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158 return "", nil;
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159 end
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160 return usermanager.test_password(prepped_username, realm, password), true;
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161 end
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162 };
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163 return new_sasl(realm, getpass_authentication_profile);
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164 end
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165
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166 return provider;
261
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167 end
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168
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169 module:add_item("auth-provider", new_default_provider(module.host));
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170