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mod_auth_dovecot/auth_dovecot/sasl_dovecot.lib.lua @ 1204:fc42f8484451
mod_s2s_keysize_policy: Add note about required LuaSec patch
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 29 Sep 2013 19:11:29 +0200 |
parent | 838:c9e2beec4ef6 |
child | 1324:853a382c9bd6 |
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 |
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36 --module "sasl_dovecot" |
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37 local _M = {}; |
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38 |
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39 local request_id = 0; |
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40 local method = {}; |
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41 method.__index = method; |
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42 local conn, supported_mechs, pid; |
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43 |
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44 local function connect(socket_info) |
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45 --log("debug", "connect(%q)", socket_path); |
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46 if conn then conn:close(); pid = nil; end |
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47 |
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48 local socket_type = (type(socket_info) == "string") and "UNIX" or "TCP"; |
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49 |
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50 local ok, err, socket_path; |
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51 if socket_type == "TCP" then |
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52 local socket_host, socket_port = unpack(socket_info); |
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53 conn = socket.tcp(); |
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54 ok, err = conn:connect(socket_host, socket_port); |
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55 socket_path = ("%s:%d"):format(socket_host, socket_port); |
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56 elseif socket.unix then |
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57 socket_path = socket_info; |
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58 conn = socket.unix(); |
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59 ok, err = conn:connect(socket_path); |
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60 else |
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61 err = "luasocket was not compiled with UNIX sockets support"; |
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62 end |
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63 |
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64 if not ok then |
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65 return false, "error connecting to dovecot "..tostring(socket_type).." socket at '" |
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66 ..tostring(socket_path or socket_info).."'. error was '"..tostring(err).."'"; |
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67 end |
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68 |
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69 -- Send our handshake |
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70 pid = tonumber(tostring(conn):match("0x%x*$")); |
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71 log("debug", "sending handshake to dovecot. version 1.1, cpid '%d'", pid); |
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72 local success,err = conn:send("VERSION\t1\t1\n"); |
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73 if not success then |
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74 return false, "Unable to send version data to socket: "..tostring(err); |
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75 end |
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76 local success,err = conn:send("CPID\t" .. pid .. "\n"); |
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77 if not success then |
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78 return false, "Unable to send PID to socket: "..tostring(err); |
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79 end |
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80 |
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81 -- Parse Dovecot's handshake |
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82 local done = false; |
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83 supported_mechs = {}; |
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84 while (not done) do |
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85 local line, err = conn:receive(); |
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86 if not line then |
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87 return false, "No data read from socket: "..tostring(err); |
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88 end |
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89 |
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90 --log("debug", "dovecot handshake: '%s'", line); |
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91 local parts = line:gmatch("[^\t]+"); |
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92 local first = parts(); |
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93 if first == "VERSION" then |
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94 -- Version should be 1.1 |
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95 local major_version = parts(); |
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96 |
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97 if major_version ~= "1" then |
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98 conn:close(); |
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99 return false, "dovecot server version is not 1.x. it is "..tostring(major_version)..".x"; |
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100 end |
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101 elseif first == "MECH" then |
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102 local mech = parts(); |
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103 supported_mechs[mech] = true; |
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104 elseif first == "DONE" then |
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105 done = true; |
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106 end |
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107 end |
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108 return conn, supported_mechs; |
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109 end |
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110 |
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111 -- create a new SASL object which can be used to authenticate clients |
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112 function _M.new(realm, service_name, socket_info, config) |
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113 --log("debug", "new(%q, %q, %q)", realm or "", service_name or "", socket_info or ""); |
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114 local sasl_i = { realm = realm, service_name = service_name, socket_info = socket_info, config = config or {} }; |
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115 |
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116 request_id = request_id + 1; |
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117 sasl_i.request_id = request_id; |
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118 local conn, mechs = conn, supported_mechs; |
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119 if not conn then |
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120 conn, mechs = connect(socket_info); |
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121 if not conn then |
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122 return nil, "Dovecot connection failure: "..tostring(mechs); |
474
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123 end |
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124 end |
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125 sasl_i.conn, sasl_i.mechs = conn, mechs; |
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126 return setmetatable(sasl_i, method); |
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127 end |
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128 |
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129 -- [[ |
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130 function method:send(...) |
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131 local msg = t_concat({...}, "\t"); |
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132 if msg:sub(-1) ~= "\n" then |
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133 msg = msg .. "\n" |
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134 end |
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135 module:log("debug", "sending %q", msg:sub(1,-2)); |
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136 local ok, err = self.conn:send(msg); |
474
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137 if not ok then |
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138 log("error", "Could not write to socket: %s", err); |
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139 if err == "closed" then |
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140 conn = nil; |
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141 end |
474
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142 return nil, err; |
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143 end |
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144 return true; |
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145 end |
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146 |
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147 function method:recv() |
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148 --log("debug", "Sent %d bytes to socket", ok); |
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149 local line, err = self.conn:receive(); |
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150 if not line then |
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151 log("error", "Could not read from socket: %s", err); |
708
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152 if err == "closed" then |
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153 conn = nil; |
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154 end |
474
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155 return nil, err; |
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156 end |
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157 module:log("debug", "received %q", line); |
474
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158 return line; |
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159 end |
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160 -- ]] |
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161 |
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162 function method:plain_test(username, password, realm) |
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163 if self:select("PLAIN") then |
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164 return self:process(("\0%s\0%s"):format(username, password)); |
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165 end |
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166 end |
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167 |
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168 -- get a fresh clone with the same realm and service name |
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169 function method:clean_clone() |
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170 --log("debug", "method:clean_clone()"); |
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171 return _M.new(self.realm, self.service_name, self.socket_info, self.config) |
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172 end |
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173 |
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174 -- get a list of possible SASL mechanims to use |
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175 function method:mechanisms() |
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176 --log("debug", "method:mechanisms()"); |
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177 return self.mechs; |
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178 end |
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179 |
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180 -- select a mechanism to use |
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181 function method:select(mechanism) |
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182 --log("debug", "method:select(%q)", mechanism); |
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183 if not self.selected and self.mechs[mechanism] then |
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184 self.selected = mechanism; |
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185 return true; |
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186 end |
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187 end |
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188 |
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189 -- feed new messages to process into the library |
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190 function method:process(message) |
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191 --log("debug", "method:process"..(message and "(%q)" or "()"), message); |
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192 --if not message then |
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193 --return "challenge"; |
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194 --return "failure", "malformed-request"; |
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195 --end |
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196 local request_id = self.request_id; |
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197 local authmsg; |
700
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198 local ok, err; |
474
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199 if not self.started then |
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200 self.started = true; |
700
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201 ok, err = self:send( |
474
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202 "AUTH", |
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|
203 request_id, |
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|
204 self.selected, |
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205 "service="..self.service_name, |
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|
206 "resp="..(message and b64(message) or "=") |
700
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diff
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|
207 ); |
474
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208 else |
700
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|
209 ok, err = self:send( |
474
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210 "CONT", |
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|
211 request_id, |
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212 (message and b64(message) or "=") |
700
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|
213 ); |
474
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214 end |
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215 --log("debug", "Sending %d bytes: %q", #authmsg, authmsg); |
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216 if not ok then |
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217 log("error", "Could not write to socket: %s", err); |
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218 return "failure", "internal-server-error", err |
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219 end |
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220 --log("debug", "Sent %d bytes to socket", ok); |
700
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|
221 local line, err = self:recv(); |
474
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222 if not line then |
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223 log("error", "Could not read from socket: %s", err); |
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224 return "failure", "internal-server-error", err |
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225 end |
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226 --log("debug", "Received %d bytes from socket: %s", #line, line); |
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|
227 |
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228 local parts = line:gmatch("[^\t]+"); |
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229 local resp = parts(); |
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230 local id = tonumber(parts()); |
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|
231 |
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232 if id ~= request_id then |
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233 return "failure", "internal-server-error", "Unexpected request id" |
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234 end |
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235 |
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236 local data = {}; |
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237 for param in parts do |
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238 data[#data+1]=param; |
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239 local k,v = param:match("^([^=]*)=?(.*)$"); |
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240 if k and #k>0 then |
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241 data[k]=v or true; |
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242 end |
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243 end |
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244 |
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245 if data.user then |
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246 local handle_domain = self.config.handle_domain; |
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247 local validate_domain = self.config.validate_domain; |
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248 if handle_domain == "split" then |
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249 local domain; |
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250 self.username, domain = prepped_split(data.user); |
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251 if validate_domain and domain ~= self.realm then |
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252 return "failure", "not-authorized", "Domain mismatch"; |
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253 end |
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254 elseif handle_domain == "escape" then |
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255 self.username = nodeprep(jid_escape(data.user)); |
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256 else |
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257 self.username = nodeprep(data.user); |
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258 end |
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259 if not self.username then |
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260 return "failure", "not-authorized", "Username failed NODEprep" |
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261 end |
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262 end |
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263 |
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264 if resp == "FAIL" then |
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265 if data.temp then |
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266 return "failure", "temporary-auth-failure", data.reason; |
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267 elseif data.authz then |
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268 return "failure", "invalid-authzid", data.reason; |
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269 else |
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270 return "failure", "not-authorized", data.reason; |
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271 end |
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272 elseif resp == "CONT" then |
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273 return "challenge", unb64(data[1]); |
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274 elseif resp == "OK" then |
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275 return "success", data.resp and unb64(data.resp) or nil; |
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276 end |
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277 end |
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278 |
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279 return _M; |