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mod_auth_dovecot/mod_auth_dovecot.lua @ 469:ff03a325aa41
mod_ircd: ignore JOIN without channel
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 01 Nov 2011 19:46:07 +0100 |
parent | 431:fb7898826026 |
rev | line source |
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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) 2010-2011 Matthew Wild |
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5 -- Copyright (C) 2010-2011 Waqas Hussain |
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6 -- Copyright (C) 2011 Kim Alvefur |
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7 -- |
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8 |
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9 pcall(require, "socket.unix"); |
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10 local datamanager = require "util.datamanager"; |
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11 local usermanager = require "core.usermanager"; |
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12 local log = require "util.logger".init("auth_dovecot"); |
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13 local new_sasl = require "util.sasl".new; |
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14 local nodeprep = require "util.encodings".stringprep.nodeprep; |
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15 local base64 = require "util.encodings".base64; |
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16 local sha1 = require "util.hashes".sha1; |
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17 |
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18 local prosody = prosody; |
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19 local socket_path = module:get_option_string("dovecot_auth_socket", "/var/run/dovecot/auth-login"); |
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20 local socket_host = module:get_option_string("dovecot_auth_host", "127.0.0.1"); |
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21 local socket_port = module:get_option_string("dovecot_auth_port"); |
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22 local append_host = module:get_option_boolean("auth_append_host", false); |
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23 if not socket_port and not socket.unix then |
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24 error("LuaSocket was not compiled with UNIX socket support. Try using Dovecot 2.x with inet_listener support, or recompile LuaSocket with UNIX socket support."); |
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25 end |
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26 |
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27 function new_provider(host) |
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28 local provider = { name = "dovecot", request_id = 0 }; |
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29 log("debug", "initializing dovecot authentication provider for host '%s'", host); |
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30 |
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31 local conn; |
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32 -- Generate an id for this connection (must be a 31-bit number, unique per process) |
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33 local pid = tonumber(sha1(host, true):sub(1, 6), 16); |
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34 |
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35 -- Closes the socket |
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36 function provider.close(self) |
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37 if conn then |
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38 conn:close(); |
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39 conn = nil; |
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40 end |
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41 end |
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42 |
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43 -- The following connects to a new socket and send the handshake |
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44 function provider.connect(self) |
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45 -- Destroy old socket |
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46 provider:close(); |
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47 |
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48 local ok, err; |
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49 if socket_port then |
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50 log("debug", "connecting to dovecot TCP socket at '%s':'%s'", socket_host, socket_port); |
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51 conn = socket.tcp(); |
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52 ok, err = conn:connect(socket_host, socket_port); |
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53 elseif socket.unix then |
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54 log("debug", "connecting to dovecot UNIX socket at '%s'", socket_path); |
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55 conn = socket.unix(); |
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56 ok, err = conn:connect(socket_path); |
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57 else |
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58 err = "luasocket was not compiled with UNIX sockets support"; |
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59 end |
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60 if not ok then |
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61 if socket_port then |
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62 log("error", "error connecting to dovecot TCP socket at '%s':'%s'. error was '%s'. check permissions", socket_host, socket_port, err); |
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63 else |
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64 log("error", "error connecting to dovecot UNIX socket at '%s'. error was '%s'. check permissions", socket_path, err); |
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65 end |
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66 provider:close(); |
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67 return false; |
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68 end |
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69 |
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70 -- Send our handshake |
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71 log("debug", "sending handshake to dovecot. version 1.1, cpid '%d'", pid); |
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72 if not provider:send("VERSION\t1\t1\n") then |
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73 return false |
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74 end |
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75 if not provider:send("CPID\t" .. pid .. "\n") then |
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76 return false |
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77 end |
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78 |
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79 -- Parse Dovecot's handshake |
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80 local done = false; |
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81 local supported_mechs = {}; |
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82 while (not done) do |
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83 local line = provider:receive(); |
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84 if not line then |
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85 return false; |
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86 end |
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87 |
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88 log("debug", "dovecot handshake: '%s'", line); |
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89 local parts = line:gmatch("[^\t]+"); |
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90 local first = parts(); |
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91 if first == "VERSION" then |
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92 -- Version should be 1.1 |
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93 local major_version = parts(); |
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94 |
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95 if major_version ~= "1" then |
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96 log("error", "dovecot server version is not 1.x. it is %s.x", major_version); |
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97 provider:close(); |
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98 return false; |
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99 end |
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100 elseif first == "MECH" then |
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101 local mech = parts(); |
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102 supported_mechs[mech] = true; |
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103 elseif first == "DONE" then |
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104 -- We need PLAIN |
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105 if not supported_mechs.PLAIN then |
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106 log("warn", "server doesn't support PLAIN mechanism."); |
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107 provider:close(); |
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108 return false; |
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109 end |
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110 done = true; |
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111 end |
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112 end |
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113 return true; |
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114 end |
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115 |
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116 -- Wrapper for send(). Handles errors |
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117 function provider.send(self, data) |
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118 local ok, err = conn:send(data); |
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119 if not ok then |
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120 log("error", "error sending '%s' to dovecot. error was '%s'", data, err); |
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121 provider:close(); |
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122 return false; |
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123 end |
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124 return true; |
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125 end |
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126 |
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127 -- Wrapper for receive(). Handles errors |
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128 function provider.receive(self) |
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129 local line, err = conn:receive(); |
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130 if not line then |
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131 log("error", "error receiving data from dovecot. error was '%s'", err); |
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132 provider:close(); |
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133 return false; |
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134 end |
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135 return line; |
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136 end |
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137 |
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138 function provider.send_auth_request(self, username, password) |
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139 if not conn then |
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140 if not provider:connect() then |
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141 return nil, "Auth failed. Dovecot communications error"; |
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142 end |
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143 end |
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144 |
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145 -- Send auth data |
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146 if append_host then |
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147 username = username .. "@" .. module.host; |
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148 end |
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149 local b64 = base64.encode(username .. "\0" .. username .. "\0" .. password); |
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150 provider.request_id = provider.request_id + 1 % 4294967296 |
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151 |
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152 local msg = "AUTH\t" .. provider.request_id .. "\tPLAIN\tservice=XMPP\tresp=" .. b64; |
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153 log("debug", "sending auth request for '%s' with password '%s': '%s'", username, password, msg); |
312
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154 if not provider:send(msg .. "\n") then |
268
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155 return nil, "Auth failed. Dovecot communications error"; |
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156 end |
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157 |
272
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158 |
268
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159 -- Get response |
312
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160 local line = provider:receive(); |
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|
161 log("debug", "got auth response: '%s'", line); |
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162 if not line then |
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163 return nil, "Auth failed. Dovecot communications error"; |
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164 end |
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165 local parts = line:gmatch("[^\t]+"); |
268
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166 |
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167 -- Check response |
273
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168 local status = parts(); |
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169 local resp_id = tonumber(parts()); |
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170 |
312
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171 if resp_id ~= provider.request_id then |
273
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172 log("warn", "dovecot response_id(%s) doesn't match request_id(%s)", resp_id, provider.request_id); |
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173 provider:close(); |
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174 return nil, "Auth failed. Dovecot communications error"; |
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175 end |
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176 |
274
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177 return status, parts; |
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178 end |
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179 |
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180 function provider.test_password(username, password) |
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181 log("debug", "test password '%s' for user %s at host %s", password, username, module.host); |
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182 |
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183 local status, extra = provider:send_auth_request(username, password); |
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184 |
312
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185 if status == "OK" then |
273
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186 log("info", "login ok for '%s'", username); |
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187 return true; |
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|
188 else |
273
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189 log("info", "login failed for '%s'", username); |
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190 return nil, "Auth failed. Invalid username or password."; |
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191 end |
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192 end |
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193 |
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194 function provider.get_password(username) |
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195 return nil, "Cannot get_password in dovecot backend."; |
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196 end |
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197 |
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198 function provider.set_password(username, password) |
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199 return nil, "Cannot set_password in dovecot backend."; |
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200 end |
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201 |
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202 function provider.user_exists(username) |
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203 log("debug", "user_exists for user %s at host %s", username, module.host); |
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204 |
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205 -- Send a request. If the response (FAIL) contains an extra |
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206 -- parameter like user=<username> then it exists. |
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207 local status, extra = provider:send_auth_request(username, ""); |
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208 |
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209 local param = extra(); |
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210 while param do |
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|
211 local parts = param:gmatch("[^=]+"); |
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212 local name = parts(); |
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213 local value = parts(); |
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214 if name == "user" then |
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215 log("debug", "user '%s' exists", username); |
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216 return true; |
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217 end |
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218 |
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219 param = extra(); |
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220 end |
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221 |
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222 log("debug", "user '%s' does not exists (or dovecot didn't send user=<username> parameter)", username); |
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223 return false; |
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224 end |
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225 |
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226 function provider.create_user(username, password) |
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227 return nil, "Cannot create_user in dovecot backend."; |
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228 end |
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229 |
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230 function provider.get_sasl_handler() |
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231 local getpass_authentication_profile = { |
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232 plain_test = function(sasl, username, password, realm) |
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233 local prepped_username = nodeprep(username); |
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234 if not prepped_username then |
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235 log("debug", "NODEprep failed on username: %s", username); |
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236 return "", nil; |
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237 end |
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238 return usermanager.test_password(prepped_username, realm, password), true; |
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239 end |
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240 }; |
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241 return new_sasl(module.host, getpass_authentication_profile); |
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242 end |
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243 |
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244 return provider; |
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245 end |
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246 |
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247 module:add_item("auth-provider", new_provider(module.host)); |