Mercurial > prosody-modules
annotate mod_auth_dovecot/auth_dovecot/sasl_dovecot.lib.lua @ 3735:06b640473cda
mod_log_json: Add a README
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 03 Nov 2019 14:45:23 +0100 |
parents | afeb06e4cdea |
children | 7406039021d8 |
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 |
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30 local unix_success, unix = pcall(require, "socket.unix"); |
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31 if unix_success and unix and not socket.unix then |
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32 -- COMPAT map new luasocket API to old |
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33 socket.unix = unix.stream or unix.tcp; |
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34 end |
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35 |
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36 local base64 = require "util.encodings".base64; |
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37 local b64, unb64 = base64.encode, base64.decode; |
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38 local jid_escape = require "util.jid".escape; |
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39 local prepped_split = require "util.jid".prepped_split; |
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40 local nodeprep = require "util.encodings".stringprep.nodeprep; |
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41 local pposix = require "util.pposix"; |
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42 |
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43 --module "sasl_dovecot" |
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44 local _M = {}; |
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45 |
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46 local request_id = 0; |
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47 local method = {}; |
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48 method.__index = method; |
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49 local conn, supported_mechs, pid; |
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50 |
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51 local function connect(socket_info) |
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52 --log("debug", "connect(%q)", socket_path); |
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53 if conn then conn:close(); pid = nil; end |
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54 |
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55 local socket_type = (type(socket_info) == "string") and "UNIX" or "TCP"; |
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56 |
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57 local ok, err, socket_path; |
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58 if socket_type == "TCP" then |
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59 local socket_host, socket_port = unpack(socket_info); |
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60 conn = socket.tcp(); |
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61 ok, err = conn:connect(socket_host, socket_port); |
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62 socket_path = ("%s:%d"):format(socket_host, socket_port); |
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63 elseif socket.unix then |
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64 socket_path = socket_info; |
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65 conn = socket.unix(); |
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66 ok, err = conn:connect(socket_path); |
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67 else |
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68 err = "luasocket was not compiled with UNIX sockets support"; |
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69 end |
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70 |
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71 if not ok then |
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72 return false, "error connecting to dovecot "..tostring(socket_type).." socket at '" |
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73 ..tostring(socket_path or socket_info).."'. error was '"..tostring(err).."'"; |
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74 end |
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75 |
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76 -- Send our handshake |
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77 pid = pposix.getpid(); |
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78 log("debug", "sending handshake to dovecot. version 1.1, cpid '%d'", pid); |
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79 local success,err = conn:send("VERSION\t1\t1\n"); |
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80 if not success then |
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81 return false, "Unable to send version data to socket: "..tostring(err); |
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82 end |
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83 local success,err = conn:send("CPID\t" .. pid .. "\n"); |
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84 if not success then |
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85 return false, "Unable to send PID to socket: "..tostring(err); |
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86 end |
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87 |
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88 -- Parse Dovecot's handshake |
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89 local done = false; |
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90 supported_mechs = {}; |
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91 while (not done) do |
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92 local line, err = conn:receive(); |
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93 if not line then |
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94 return false, "No data read from socket: "..tostring(err); |
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95 end |
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96 |
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97 --log("debug", "dovecot handshake: '%s'", line); |
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98 local parts = line:gmatch("[^\t]+"); |
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99 local first = parts(); |
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100 if first == "VERSION" then |
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101 -- Version should be 1.1 |
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102 local major_version = parts(); |
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103 |
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104 if major_version ~= "1" then |
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105 conn:close(); |
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106 return false, "dovecot server version is not 1.x. it is "..tostring(major_version)..".x"; |
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107 end |
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108 elseif first == "MECH" then |
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109 local mech = parts(); |
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110 supported_mechs[mech] = true; |
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111 elseif first == "DONE" then |
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112 done = true; |
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113 end |
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114 end |
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115 return conn, supported_mechs; |
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116 end |
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117 |
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118 -- create a new SASL object which can be used to authenticate clients |
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119 function _M.new(realm, service_name, socket_info, config) |
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120 --log("debug", "new(%q, %q, %q)", realm or "", service_name or "", socket_info or ""); |
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121 local sasl_i = { realm = realm, service_name = service_name, socket_info = socket_info, config = config or {} }; |
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122 |
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123 request_id = request_id + 1; |
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124 sasl_i.request_id = request_id; |
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125 local conn, mechs = conn, supported_mechs; |
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126 if not conn then |
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127 conn, mechs = connect(socket_info); |
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128 if not conn then |
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129 return nil, "Dovecot connection failure: "..tostring(mechs); |
474
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130 end |
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131 end |
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132 sasl_i.conn, sasl_i.mechs = conn, mechs; |
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133 return setmetatable(sasl_i, method); |
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134 end |
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135 |
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136 -- [[ |
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137 function method:send(...) |
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138 local msg = t_concat({...}, "\t"); |
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139 if msg:sub(-1) ~= "\n" then |
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140 msg = msg .. "\n" |
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141 end |
2861
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Kim Alvefur <zash@zash.se>
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142 -- module:log("debug", "sending %q", msg:sub(1,-2)); |
700
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143 local ok, err = self.conn:send(msg); |
474
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144 if not ok then |
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145 log("error", "Could not write to socket: %s", err); |
708
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146 if err == "closed" then |
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147 conn = nil; |
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148 end |
474
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149 return nil, err; |
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150 end |
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151 return true; |
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152 end |
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153 |
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154 function method:recv() |
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155 --log("debug", "Sent %d bytes to socket", ok); |
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156 local line, err = self.conn:receive(); |
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157 if not line then |
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158 log("error", "Could not read from socket: %s", err); |
708
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700
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159 if err == "closed" then |
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160 conn = nil; |
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161 end |
474
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162 return nil, err; |
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163 end |
700
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164 module:log("debug", "received %q", line); |
474
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165 return line; |
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166 end |
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|
167 -- ]] |
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|
168 |
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169 function method:plain_test(username, password, realm) |
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170 if self:select("PLAIN") then |
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171 return self:process(("\0%s\0%s"):format(username, password)); |
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172 end |
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173 end |
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174 |
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175 -- get a fresh clone with the same realm and service name |
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|
176 function method:clean_clone() |
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177 --log("debug", "method:clean_clone()"); |
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178 return _M.new(self.realm, self.service_name, self.socket_info, self.config) |
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179 end |
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180 |
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181 -- get a list of possible SASL mechanims to use |
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|
182 function method:mechanisms() |
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183 --log("debug", "method:mechanisms()"); |
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184 return self.mechs; |
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diff
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185 end |
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186 |
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187 -- select a mechanism to use |
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188 function method:select(mechanism) |
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189 --log("debug", "method:select(%q)", mechanism); |
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Kim Alvefur <zash@zash.se>
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190 if not self.selected and self.mechs[mechanism] then |
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191 self.selected = mechanism; |
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192 return true; |
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193 end |
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194 end |
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195 |
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196 -- feed new messages to process into the library |
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197 function method:process(message) |
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198 --log("debug", "method:process"..(message and "(%q)" or "()"), message); |
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199 --if not message then |
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200 --return "challenge"; |
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201 --return "failure", "malformed-request"; |
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202 --end |
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203 local request_id = self.request_id; |
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|
204 local authmsg; |
700
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474
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205 local ok, err; |
474
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206 if not self.started then |
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207 self.started = true; |
700
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|
208 ok, err = self:send( |
474
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|
209 "AUTH", |
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|
210 request_id, |
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|
211 self.selected, |
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Kim Alvefur <zash@zash.se>
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|
212 "service="..self.service_name, |
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|
213 "resp="..(message and b64(message) or "=") |
700
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parents:
474
diff
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|
214 ); |
474
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215 else |
700
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diff
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|
216 ok, err = self:send( |
474
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|
217 "CONT", |
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|
218 request_id, |
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219 (message and b64(message) or "=") |
700
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diff
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|
220 ); |
474
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221 end |
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222 --log("debug", "Sending %d bytes: %q", #authmsg, authmsg); |
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|
223 if not ok then |
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224 log("error", "Could not write to 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", "Sent %d bytes to socket", ok); |
700
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parents:
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|
228 local line, err = self:recv(); |
474
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229 if not line then |
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230 log("error", "Could not read from socket: %s", err); |
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231 return "failure", "internal-server-error", err |
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232 end |
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233 --log("debug", "Received %d bytes from socket: %s", #line, line); |
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234 |
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235 local parts = line:gmatch("[^\t]+"); |
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236 local resp = parts(); |
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237 local id = tonumber(parts()); |
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238 |
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239 if id ~= request_id then |
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240 return "failure", "internal-server-error", "Unexpected request id" |
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241 end |
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242 |
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243 local data = {}; |
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244 for param in parts do |
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245 data[#data+1]=param; |
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246 local k,v = param:match("^([^=]*)=?(.*)$"); |
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247 if k and #k>0 then |
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248 data[k]=v or true; |
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249 end |
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250 end |
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251 |
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252 if data.user then |
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253 local handle_domain = self.config.handle_domain; |
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254 local validate_domain = self.config.validate_domain; |
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255 if handle_domain == "split" then |
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256 local domain; |
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257 self.username, domain = prepped_split(data.user); |
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258 if validate_domain and domain ~= self.realm then |
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259 return "failure", "not-authorized", "Domain mismatch"; |
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260 end |
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261 elseif handle_domain == "escape" then |
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262 self.username = nodeprep(jid_escape(data.user)); |
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263 else |
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264 self.username = nodeprep(data.user); |
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265 end |
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266 if not self.username then |
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267 return "failure", "not-authorized", "Username failed NODEprep" |
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268 end |
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269 end |
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270 |
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271 if resp == "FAIL" then |
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272 if data.temp then |
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273 return "failure", "temporary-auth-failure", data.reason; |
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274 elseif data.authz then |
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275 return "failure", "invalid-authzid", data.reason; |
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276 else |
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277 return "failure", "not-authorized", data.reason; |
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278 end |
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279 elseif resp == "CONT" then |
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280 return "challenge", unb64(data[1]); |
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281 elseif resp == "OK" then |
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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282 return "success", data.resp and unb64(data.resp) or nil; |
474
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283 end |
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284 end |
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285 |
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286 return _M; |