prosody-modules
56f1c29ee7f1
mod_auth_dovecot/mod_auth_dovecot.lua

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mod_auth_dovecot/mod_auth_dovecot.lua @ 446:56f1c29ee7f1

mod_pastebin: Some experimental summary changes
author Matthew Wild <mwild1@gmail.com>
date Fri, 23 Sep 2011 21:15:24 +0100
parent 431:fb7898826026
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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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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
268
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diff changeset
117 function provider.send(self, data)
312
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diff changeset
118 local ok, err = conn:send(data);
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diff changeset
119 if not ok then
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diff changeset
120 log("error", "error sending '%s' to dovecot. error was '%s'", data, err);
269
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diff changeset
121 provider:close();
268
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diff changeset
122 return false;
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diff changeset
123 end
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diff changeset
124 return true;
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diff changeset
125 end
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diff changeset
126
269
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diff changeset
127 -- Wrapper for receive(). Handles errors
268
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diff changeset
128 function provider.receive(self)
312
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diff changeset
129 local line, err = conn:receive();
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diff changeset
130 if not line then
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diff changeset
131 log("error", "error receiving data from dovecot. error was '%s'", err);
269
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diff changeset
132 provider:close();
268
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diff changeset
133 return false;
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diff changeset
134 end
312
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diff changeset
135 return line;
268
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diff changeset
136 end
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diff changeset
137
274
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diff changeset
138 function provider.send_auth_request(self, username, password)
310
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diff changeset
139 if not conn then
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diff changeset
140 if not provider:connect() then
269
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diff changeset
141 return nil, "Auth failed. Dovecot communications error";
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diff changeset
142 end
268
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diff changeset
143 end
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144
261
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diff changeset
145 -- Send auth data
410
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Kim Alvefur <zash@zash.se>
parents: 342
diff changeset
146 if append_host then
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Kim Alvefur <zash@zash.se>
parents: 342
diff changeset
147 username = username .. "@" .. module.host;
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parents: 342
diff changeset
148 end
261
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diff changeset
149 local b64 = base64.encode(username .. "\0" .. username .. "\0" .. password);
273
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diff changeset
150 provider.request_id = provider.request_id + 1 % 4294967296
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diff changeset
151
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diff changeset
152 local msg = "AUTH\t" .. provider.request_id .. "\tPLAIN\tservice=XMPP\tresp=" .. b64;
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diff changeset
153 log("debug", "sending auth request for '%s' with password '%s': '%s'", username, password, msg);
312
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diff changeset
154 if not provider:send(msg .. "\n") then
268
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diff changeset
155 return nil, "Auth failed. Dovecot communications error";
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diff changeset
156 end
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diff changeset
157
272
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diff changeset
158
268
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diff changeset
159 -- Get response
312
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diff changeset
160 local line = provider:receive();
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diff changeset
161 log("debug", "got auth response: '%s'", line);
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diff changeset
162 if not line then
268
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diff changeset
163 return nil, "Auth failed. Dovecot communications error";
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diff changeset
164 end
312
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diff changeset
165 local parts = line:gmatch("[^\t]+");
268
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diff changeset
166
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diff changeset
167 -- Check response
273
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diff changeset
168 local status = parts();
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diff changeset
169 local resp_id = tonumber(parts());
274
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diff changeset
170
312
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diff changeset
171 if resp_id ~= provider.request_id then
273
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diff changeset
172 log("warn", "dovecot response_id(%s) doesn't match request_id(%s)", resp_id, provider.request_id);
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diff changeset
173 provider:close();
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diff changeset
174 return nil, "Auth failed. Dovecot communications error";
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diff changeset
175 end
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diff changeset
176
274
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diff changeset
177 return status, parts;
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diff changeset
178 end
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diff changeset
179
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diff changeset
180 function provider.test_password(username, password)
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diff changeset
181 log("debug", "test password '%s' for user %s at host %s", password, username, module.host);
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diff changeset
182
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diff changeset
183 local status, extra = provider:send_auth_request(username, password);
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diff changeset
184
312
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diff changeset
185 if status == "OK" then
273
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diff changeset
186 log("info", "login ok for '%s'", username);
261
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diff changeset
187 return true;
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parents:
diff changeset
188 else
273
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diff changeset
189 log("info", "login failed for '%s'", username);
261
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parents:
diff changeset
190 return nil, "Auth failed. Invalid username or password.";
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parents:
diff changeset
191 end
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parents:
diff changeset
192 end
269
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diff changeset
193
261
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parents:
diff changeset
194 function provider.get_password(username)
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parents:
diff changeset
195 return nil, "Cannot get_password in dovecot backend.";
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parents:
diff changeset
196 end
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parents:
diff changeset
197
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parents:
diff changeset
198 function provider.set_password(username, password)
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parents:
diff changeset
199 return nil, "Cannot set_password in dovecot backend.";
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parents:
diff changeset
200 end
269
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diff changeset
201
261
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parents:
diff changeset
202 function provider.user_exists(username)
274
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diff changeset
203 log("debug", "user_exists for user %s at host %s", username, module.host);
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parents: 273
diff changeset
204
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parents: 273
diff changeset
205 -- Send a request. If the response (FAIL) contains an extra
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parents: 273
diff changeset
206 -- parameter like user=<username> then it exists.
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diff changeset
207 local status, extra = provider:send_auth_request(username, "");
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diff changeset
208
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diff changeset
209 local param = extra();
312
31deafcbf623 mod_auth_dovecot: Fix various global variable sets/gets, log levels, unclear variable names and change coding style to match more closely the rest of the Prosody code.
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parents: 311
diff changeset
210 while param do
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parents: 311
diff changeset
211 local parts = param:gmatch("[^=]+");
31deafcbf623 mod_auth_dovecot: Fix various global variable sets/gets, log levels, unclear variable names and change coding style to match more closely the rest of the Prosody code.
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parents: 311
diff changeset
212 local name = parts();
31deafcbf623 mod_auth_dovecot: Fix various global variable sets/gets, log levels, unclear variable names and change coding style to match more closely the rest of the Prosody code.
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parents: 311
diff changeset
213 local value = parts();
31deafcbf623 mod_auth_dovecot: Fix various global variable sets/gets, log levels, unclear variable names and change coding style to match more closely the rest of the Prosody code.
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parents: 311
diff changeset
214 if name == "user" then
31deafcbf623 mod_auth_dovecot: Fix various global variable sets/gets, log levels, unclear variable names and change coding style to match more closely the rest of the Prosody code.
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parents: 311
diff changeset
215 log("debug", "user '%s' exists", username);
274
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diff changeset
216 return true;
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diff changeset
217 end
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diff changeset
218
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diff changeset
219 param = extra();
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diff changeset
220 end
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diff changeset
221
312
31deafcbf623 mod_auth_dovecot: Fix various global variable sets/gets, log levels, unclear variable names and change coding style to match more closely the rest of the Prosody code.
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parents: 311
diff changeset
222 log("debug", "user '%s' does not exists (or dovecot didn't send user=<username> parameter)", username);
274
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diff changeset
223 return false;
261
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parents:
diff changeset
224 end
269
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diff changeset
225
261
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parents:
diff changeset
226 function provider.create_user(username, password)
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parents:
diff changeset
227 return nil, "Cannot create_user in dovecot backend.";
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parents:
diff changeset
228 end
269
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diff changeset
229
261
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parents:
diff changeset
230 function provider.get_sasl_handler()
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parents:
diff changeset
231 local getpass_authentication_profile = {
305
4c3abf1a9b5a mod_auth_*, mod_saslauth_muc: Update SASL callbacks to take SASL handler as first argument.
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parents: 274
diff changeset
232 plain_test = function(sasl, username, password, realm)
268
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parents: 267
diff changeset
233 local prepped_username = nodeprep(username);
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parents: 267
diff changeset
234 if not prepped_username then
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parents: 267
diff changeset
235 log("debug", "NODEprep failed on username: %s", username);
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diff changeset
236 return "", nil;
cfcd4efb0fa4 mod_auth_dovecot: Remove asserts (use logger) and refactor socket code
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parents: 267
diff changeset
237 end
cfcd4efb0fa4 mod_auth_dovecot: Remove asserts (use logger) and refactor socket code
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diff changeset
238 return usermanager.test_password(prepped_username, realm, password), true;
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diff changeset
239 end
269
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diff changeset
240 };
342
8e9e5c7d97ff mod_auth_*: Get rid of undocumented and broken 'sasl_realm' config option.
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parents: 340
diff changeset
241 return new_sasl(module.host, getpass_authentication_profile);
269
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Javier Torres <javitonino@gmail.com>
parents: 268
diff changeset
242 end
74846ec9c29f mod_auth_dovecot: Close socket on error
Javier Torres <javitonino@gmail.com>
parents: 268
diff changeset
243
74846ec9c29f mod_auth_dovecot: Close socket on error
Javier Torres <javitonino@gmail.com>
parents: 268
diff changeset
244 return provider;
261
0f46fb2dbc79 mod_auth_dovecot: Initial commit of Dovecot authentication backend by Javier Torres
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
245 end
0f46fb2dbc79 mod_auth_dovecot: Initial commit of Dovecot authentication backend by Javier Torres
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
246
312
31deafcbf623 mod_auth_dovecot: Fix various global variable sets/gets, log levels, unclear variable names and change coding style to match more closely the rest of the Prosody code.
Matthew Wild <mwild1@gmail.com>
parents: 311
diff changeset
247 module:add_item("auth-provider", new_provider(module.host));