Mercurial > prosody-modules
annotate mod_auth_dovecot/auth_dovecot/sasl_dovecot.lib.lua @ 2418:ef95853cf900
mod_firewall: More semicolons
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 16 Dec 2016 03:30:46 +0100 |
parents | a573d64968e9 |
children | e9ca7fd4ad06 |
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) 2008-2009 Tobias Markmann |
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4 -- Copyright (C) 2010 Javier Torres |
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5 -- Copyright (C) 2010-2011 Matthew Wild |
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6 -- Copyright (C) 2010-2011 Waqas Hussain |
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7 -- Copyright (C) 2011 Kim Alvefur |
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8 -- |
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9 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: |
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10 -- |
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11 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. |
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12 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. |
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13 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. |
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14 -- |
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15 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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16 |
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17 -- This code is based on util.sasl_cyrus and the old mod_auth_dovecot |
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18 |
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19 local log = require "util.logger".init("sasl_dovecot"); |
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20 |
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21 local setmetatable = setmetatable; |
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22 |
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23 local s_match, s_gmatch = string.match, string.gmatch |
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24 local t_concat = table.concat; |
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25 local m_random = math.random; |
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26 local tostring, tonumber = tostring, tonumber; |
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27 |
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28 local socket = require "socket" |
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29 pcall(require, "socket.unix"); |
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30 local base64 = require "util.encodings".base64; |
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31 local b64, unb64 = base64.encode, base64.decode; |
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32 local jid_escape = require "util.jid".escape; |
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33 local prepped_split = require "util.jid".prepped_split; |
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34 local nodeprep = require "util.encodings".stringprep.nodeprep; |
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35 local pposix = require "util.pposix"; |
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36 |
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37 --module "sasl_dovecot" |
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38 local _M = {}; |
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39 |
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40 local request_id = 0; |
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41 local method = {}; |
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42 method.__index = method; |
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43 local conn, supported_mechs, pid; |
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44 |
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45 local function connect(socket_info) |
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46 --log("debug", "connect(%q)", socket_path); |
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47 if conn then conn:close(); pid = nil; end |
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48 |
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49 local socket_type = (type(socket_info) == "string") and "UNIX" or "TCP"; |
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50 |
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51 local ok, err, socket_path; |
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52 if socket_type == "TCP" then |
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53 local socket_host, socket_port = unpack(socket_info); |
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54 conn = socket.tcp(); |
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55 ok, err = conn:connect(socket_host, socket_port); |
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56 socket_path = ("%s:%d"):format(socket_host, socket_port); |
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57 elseif socket.unix then |
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58 socket_path = socket_info; |
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59 conn = socket.unix(); |
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60 ok, err = conn:connect(socket_path); |
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61 else |
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62 err = "luasocket was not compiled with UNIX sockets support"; |
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63 end |
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64 |
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65 if not ok then |
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66 return false, "error connecting to dovecot "..tostring(socket_type).." socket at '" |
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67 ..tostring(socket_path or socket_info).."'. error was '"..tostring(err).."'"; |
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68 end |
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69 |
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70 -- Send our handshake |
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71 pid = pposix.getpid(); |
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72 log("debug", "sending handshake to dovecot. version 1.1, cpid '%d'", pid); |
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73 local success,err = conn:send("VERSION\t1\t1\n"); |
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74 if not success then |
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75 return false, "Unable to send version data to socket: "..tostring(err); |
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76 end |
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77 local success,err = conn:send("CPID\t" .. pid .. "\n"); |
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78 if not success then |
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79 return false, "Unable to send PID to socket: "..tostring(err); |
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80 end |
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81 |
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82 -- Parse Dovecot's handshake |
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83 local done = false; |
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84 supported_mechs = {}; |
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85 while (not done) do |
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86 local line, err = conn:receive(); |
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87 if not line then |
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88 return false, "No data read from socket: "..tostring(err); |
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89 end |
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90 |
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91 --log("debug", "dovecot handshake: '%s'", line); |
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92 local parts = line:gmatch("[^\t]+"); |
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93 local first = parts(); |
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94 if first == "VERSION" then |
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95 -- Version should be 1.1 |
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96 local major_version = parts(); |
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97 |
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98 if major_version ~= "1" then |
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99 conn:close(); |
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100 return false, "dovecot server version is not 1.x. it is "..tostring(major_version)..".x"; |
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101 end |
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102 elseif first == "MECH" then |
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103 local mech = parts(); |
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104 supported_mechs[mech] = true; |
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105 elseif first == "DONE" then |
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106 done = true; |
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107 end |
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108 end |
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109 return conn, supported_mechs; |
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110 end |
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111 |
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112 -- create a new SASL object which can be used to authenticate clients |
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113 function _M.new(realm, service_name, socket_info, config) |
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114 --log("debug", "new(%q, %q, %q)", realm or "", service_name or "", socket_info or ""); |
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115 local sasl_i = { realm = realm, service_name = service_name, socket_info = socket_info, config = config or {} }; |
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116 |
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117 request_id = request_id + 1; |
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118 sasl_i.request_id = request_id; |
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119 local conn, mechs = conn, supported_mechs; |
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120 if not conn then |
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121 conn, mechs = connect(socket_info); |
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122 if not conn then |
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123 return nil, "Dovecot connection failure: "..tostring(mechs); |
474
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124 end |
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125 end |
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126 sasl_i.conn, sasl_i.mechs = conn, mechs; |
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127 return setmetatable(sasl_i, method); |
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128 end |
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129 |
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130 -- [[ |
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131 function method:send(...) |
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132 local msg = t_concat({...}, "\t"); |
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133 if msg:sub(-1) ~= "\n" then |
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134 msg = msg .. "\n" |
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135 end |
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136 module:log("debug", "sending %q", msg:sub(1,-2)); |
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137 local ok, err = self.conn:send(msg); |
474
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138 if not ok then |
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139 log("error", "Could not write to socket: %s", err); |
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140 if err == "closed" then |
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141 conn = nil; |
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142 end |
474
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143 return nil, err; |
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144 end |
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145 return true; |
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146 end |
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147 |
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148 function method:recv() |
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149 --log("debug", "Sent %d bytes to socket", ok); |
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150 local line, err = self.conn:receive(); |
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151 if not line then |
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152 log("error", "Could not read from socket: %s", err); |
708
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153 if err == "closed" then |
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154 conn = nil; |
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155 end |
474
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156 return nil, err; |
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157 end |
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158 module:log("debug", "received %q", line); |
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159 return line; |
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160 end |
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161 -- ]] |
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162 |
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163 function method:plain_test(username, password, realm) |
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164 if self:select("PLAIN") then |
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165 return self:process(("\0%s\0%s"):format(username, password)); |
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166 end |
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167 end |
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168 |
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169 -- get a fresh clone with the same realm and service name |
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170 function method:clean_clone() |
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171 --log("debug", "method:clean_clone()"); |
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172 return _M.new(self.realm, self.service_name, self.socket_info, self.config) |
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173 end |
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174 |
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175 -- get a list of possible SASL mechanims to use |
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176 function method:mechanisms() |
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177 --log("debug", "method:mechanisms()"); |
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178 return self.mechs; |
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179 end |
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180 |
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181 -- select a mechanism to use |
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182 function method:select(mechanism) |
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183 --log("debug", "method:select(%q)", mechanism); |
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184 if not self.selected and self.mechs[mechanism] then |
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185 self.selected = mechanism; |
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186 return true; |
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187 end |
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188 end |
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189 |
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190 -- feed new messages to process into the library |
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191 function method:process(message) |
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192 --log("debug", "method:process"..(message and "(%q)" or "()"), message); |
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193 --if not message then |
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194 --return "challenge"; |
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195 --return "failure", "malformed-request"; |
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196 --end |
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197 local request_id = self.request_id; |
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198 local authmsg; |
700
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199 local ok, err; |
474
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200 if not self.started then |
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201 self.started = true; |
700
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202 ok, err = self:send( |
474
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203 "AUTH", |
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204 request_id, |
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205 self.selected, |
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206 "service="..self.service_name, |
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207 "resp="..(message and b64(message) or "=") |
700
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|
208 ); |
474
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209 else |
700
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210 ok, err = self:send( |
474
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211 "CONT", |
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|
212 request_id, |
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213 (message and b64(message) or "=") |
700
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|
214 ); |
474
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215 end |
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216 --log("debug", "Sending %d bytes: %q", #authmsg, authmsg); |
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217 if not ok then |
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218 log("error", "Could not write to socket: %s", err); |
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219 return "failure", "internal-server-error", err |
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220 end |
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221 --log("debug", "Sent %d bytes to socket", ok); |
700
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|
222 local line, err = self:recv(); |
474
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223 if not line then |
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224 log("error", "Could not read from socket: %s", err); |
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225 return "failure", "internal-server-error", err |
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226 end |
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227 --log("debug", "Received %d bytes from socket: %s", #line, line); |
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|
228 |
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229 local parts = line:gmatch("[^\t]+"); |
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230 local resp = parts(); |
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231 local id = tonumber(parts()); |
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232 |
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233 if id ~= request_id then |
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234 return "failure", "internal-server-error", "Unexpected request id" |
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235 end |
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236 |
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237 local data = {}; |
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238 for param in parts do |
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239 data[#data+1]=param; |
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240 local k,v = param:match("^([^=]*)=?(.*)$"); |
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241 if k and #k>0 then |
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242 data[k]=v or true; |
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243 end |
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244 end |
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245 |
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246 if data.user then |
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247 local handle_domain = self.config.handle_domain; |
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248 local validate_domain = self.config.validate_domain; |
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249 if handle_domain == "split" then |
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250 local domain; |
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251 self.username, domain = prepped_split(data.user); |
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252 if validate_domain and domain ~= self.realm then |
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253 return "failure", "not-authorized", "Domain mismatch"; |
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254 end |
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255 elseif handle_domain == "escape" then |
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256 self.username = nodeprep(jid_escape(data.user)); |
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257 else |
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258 self.username = nodeprep(data.user); |
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259 end |
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260 if not self.username then |
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261 return "failure", "not-authorized", "Username failed NODEprep" |
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262 end |
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263 end |
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264 |
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265 if resp == "FAIL" then |
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266 if data.temp then |
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267 return "failure", "temporary-auth-failure", data.reason; |
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268 elseif data.authz then |
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269 return "failure", "invalid-authzid", data.reason; |
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270 else |
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271 return "failure", "not-authorized", data.reason; |
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272 end |
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273 elseif resp == "CONT" then |
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274 return "challenge", unb64(data[1]); |
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275 elseif resp == "OK" then |
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276 return "success", data.resp and unb64(data.resp) or nil; |
474
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277 end |
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278 end |
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279 |
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280 return _M; |