Mercurial > prosody-modules
annotate mod_auth_dovecot/auth_dovecot/sasl_dovecot.lib.lua @ 5549:01a0b67a9afd
mod_http_oauth2: Add TODO about disabling password grant
Per recommendation in draft-ietf-oauth-security-topics-23 it should at
the very least be disabled by default.
However since this is used by the Snikket web portal some care needs to
be taken not to break this, unless it's already broken by other changes
to this module.
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 16 Jun 2023 00:06:53 +0200 |
parents | 7406039021d8 |
children |
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 local unpack = table.unpack or unpack; |
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28 |
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29 local socket = require "socket" |
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30 |
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31 local unix_success, unix = pcall(require, "socket.unix"); |
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32 if unix_success and unix and not socket.unix then |
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33 -- COMPAT map new luasocket API to old |
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34 socket.unix = unix.stream or unix.tcp; |
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35 end |
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36 |
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37 local base64 = require "util.encodings".base64; |
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38 local b64, unb64 = base64.encode, base64.decode; |
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39 local jid_escape = require "util.jid".escape; |
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40 local prepped_split = require "util.jid".prepped_split; |
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41 local nodeprep = require "util.encodings".stringprep.nodeprep; |
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42 local pposix = require "util.pposix"; |
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43 |
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44 --module "sasl_dovecot" |
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45 local _M = {}; |
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46 |
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47 local request_id = 0; |
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48 local method = {}; |
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49 method.__index = method; |
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50 local conn, supported_mechs, pid; |
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51 |
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52 local function connect(socket_info) |
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53 --log("debug", "connect(%q)", socket_path); |
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54 if conn then conn:close(); pid = nil; end |
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55 |
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56 local socket_type = (type(socket_info) == "string") and "UNIX" or "TCP"; |
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57 |
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58 local ok, err, socket_path; |
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59 if socket_type == "TCP" then |
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60 local socket_host, socket_port = unpack(socket_info); |
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61 conn = socket.tcp(); |
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62 ok, err = conn:connect(socket_host, socket_port); |
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63 socket_path = ("%s:%d"):format(socket_host, socket_port); |
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64 elseif socket.unix then |
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65 socket_path = socket_info; |
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66 conn = socket.unix(); |
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67 ok, err = conn:connect(socket_path); |
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68 else |
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69 err = "luasocket was not compiled with UNIX sockets support"; |
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70 end |
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71 |
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72 if not ok then |
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73 return false, "error connecting to dovecot "..tostring(socket_type).." socket at '" |
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74 ..tostring(socket_path or socket_info).."'. error was '"..tostring(err).."'"; |
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75 end |
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76 |
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77 -- Send our handshake |
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78 pid = pposix.getpid(); |
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79 log("debug", "sending handshake to dovecot. version 1.1, cpid '%d'", pid); |
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80 local success,err = conn:send("VERSION\t1\t1\n"); |
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81 if not success then |
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82 return false, "Unable to send version data to socket: "..tostring(err); |
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83 end |
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84 local success,err = conn:send("CPID\t" .. pid .. "\n"); |
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85 if not success then |
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86 return false, "Unable to send PID to socket: "..tostring(err); |
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87 end |
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88 |
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89 -- Parse Dovecot's handshake |
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90 local done = false; |
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91 supported_mechs = {}; |
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92 while (not done) do |
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93 local line, err = conn:receive(); |
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94 if not line then |
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95 return false, "No data read from socket: "..tostring(err); |
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96 end |
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97 |
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98 --log("debug", "dovecot handshake: '%s'", line); |
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99 local parts = line:gmatch("[^\t]+"); |
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100 local first = parts(); |
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101 if first == "VERSION" then |
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102 -- Version should be 1.1 |
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103 local major_version = parts(); |
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104 |
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105 if major_version ~= "1" then |
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106 conn:close(); |
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107 return false, "dovecot server version is not 1.x. it is "..tostring(major_version)..".x"; |
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108 end |
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109 elseif first == "MECH" then |
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110 local mech = parts(); |
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111 supported_mechs[mech] = true; |
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112 elseif first == "DONE" then |
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113 done = true; |
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114 end |
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115 end |
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116 return conn, supported_mechs; |
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117 end |
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118 |
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119 -- create a new SASL object which can be used to authenticate clients |
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120 function _M.new(realm, service_name, socket_info, config) |
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121 --log("debug", "new(%q, %q, %q)", realm or "", service_name or "", socket_info or ""); |
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122 local sasl_i = { realm = realm, service_name = service_name, socket_info = socket_info, config = config or {} }; |
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123 |
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124 request_id = request_id + 1; |
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125 sasl_i.request_id = request_id; |
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126 local conn, mechs = conn, supported_mechs; |
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127 if not conn then |
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128 conn, mechs = connect(socket_info); |
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129 if not conn then |
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130 return nil, "Dovecot connection failure: "..tostring(mechs); |
474
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131 end |
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132 end |
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133 sasl_i.conn, sasl_i.mechs = conn, mechs; |
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134 return setmetatable(sasl_i, method); |
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135 end |
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136 |
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137 -- [[ |
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138 function method:send(...) |
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139 local msg = t_concat({...}, "\t"); |
700
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140 if msg:sub(-1) ~= "\n" then |
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141 msg = msg .. "\n" |
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142 end |
2861
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Kim Alvefur <zash@zash.se>
parents:
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143 -- module:log("debug", "sending %q", msg:sub(1,-2)); |
700
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144 local ok, err = self.conn:send(msg); |
474
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145 if not ok then |
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146 log("error", "Could not write to socket: %s", err); |
708
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Kim Alvefur <zash@zash.se>
parents:
700
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147 if err == "closed" then |
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Kim Alvefur <zash@zash.se>
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700
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148 conn = nil; |
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149 end |
474
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150 return nil, err; |
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151 end |
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152 return true; |
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153 end |
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154 |
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155 function method:recv() |
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156 --log("debug", "Sent %d bytes to socket", ok); |
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157 local line, err = self.conn:receive(); |
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158 if not line then |
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159 log("error", "Could not read from socket: %s", err); |
708
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Kim Alvefur <zash@zash.se>
parents:
700
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|
160 if err == "closed" then |
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Kim Alvefur <zash@zash.se>
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700
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161 conn = nil; |
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700
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|
162 end |
474
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163 return nil, err; |
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164 end |
700
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parents:
474
diff
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|
165 module:log("debug", "received %q", line); |
474
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166 return line; |
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167 end |
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|
168 -- ]] |
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|
169 |
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|
170 function method:plain_test(username, password, realm) |
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Kim Alvefur <zash@zash.se>
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|
171 if self:select("PLAIN") then |
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172 return self:process(("\0%s\0%s"):format(username, password)); |
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173 end |
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parents:
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174 end |
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parents:
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|
175 |
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|
176 -- get a fresh clone with the same realm and service name |
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Kim Alvefur <zash@zash.se>
parents:
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|
177 function method:clean_clone() |
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|
178 --log("debug", "method:clean_clone()"); |
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|
179 return _M.new(self.realm, self.service_name, self.socket_info, self.config) |
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diff
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180 end |
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181 |
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|
182 -- get a list of possible SASL mechanims to use |
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Kim Alvefur <zash@zash.se>
parents:
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|
183 function method:mechanisms() |
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|
184 --log("debug", "method:mechanisms()"); |
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185 return self.mechs; |
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|
186 end |
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187 |
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188 -- select a mechanism to use |
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189 function method:select(mechanism) |
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190 --log("debug", "method:select(%q)", mechanism); |
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Kim Alvefur <zash@zash.se>
parents:
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191 if not self.selected and self.mechs[mechanism] then |
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192 self.selected = mechanism; |
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193 return true; |
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194 end |
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195 end |
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196 |
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197 -- feed new messages to process into the library |
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198 function method:process(message) |
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199 --log("debug", "method:process"..(message and "(%q)" or "()"), message); |
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|
200 --if not message then |
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|
201 --return "challenge"; |
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|
202 --return "failure", "malformed-request"; |
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203 --end |
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|
204 local request_id = self.request_id; |
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diff
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|
205 local authmsg; |
700
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474
diff
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|
206 local ok, err; |
474
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|
207 if not self.started then |
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|
208 self.started = true; |
700
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parents:
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diff
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|
209 ok, err = self:send( |
474
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diff
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|
210 "AUTH", |
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parents:
diff
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|
211 request_id, |
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Kim Alvefur <zash@zash.se>
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diff
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|
212 self.selected, |
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Kim Alvefur <zash@zash.se>
parents:
diff
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|
213 "service="..self.service_name, |
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parents:
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|
214 "resp="..(message and b64(message) or "=") |
700
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parents:
474
diff
changeset
|
215 ); |
474
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|
216 else |
700
0c130c45b7c1
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parents:
474
diff
changeset
|
217 ok, err = self:send( |
474
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diff
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|
218 "CONT", |
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|
219 request_id, |
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|
220 (message and b64(message) or "=") |
700
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parents:
474
diff
changeset
|
221 ); |
474
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222 end |
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223 --log("debug", "Sending %d bytes: %q", #authmsg, authmsg); |
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parents:
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|
224 if not ok then |
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|
225 log("error", "Could not write to socket: %s", err); |
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parents:
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|
226 return "failure", "internal-server-error", err |
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Kim Alvefur <zash@zash.se>
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227 end |
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228 --log("debug", "Sent %d bytes to socket", ok); |
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229 local line, err = self:recv(); |
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230 if not line then |
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231 log("error", "Could not read from socket: %s", err); |
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232 return "failure", "internal-server-error", err |
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233 end |
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234 --log("debug", "Received %d bytes from socket: %s", #line, line); |
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235 |
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236 local parts = line:gmatch("[^\t]+"); |
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237 local resp = parts(); |
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238 local id = tonumber(parts()); |
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239 |
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240 if id ~= request_id then |
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241 return "failure", "internal-server-error", "Unexpected request id" |
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242 end |
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243 |
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244 local data = {}; |
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245 for param in parts do |
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246 data[#data+1]=param; |
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247 local k,v = param:match("^([^=]*)=?(.*)$"); |
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248 if k and #k>0 then |
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249 data[k]=v or true; |
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250 end |
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251 end |
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252 |
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253 if data.user then |
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254 local handle_domain = self.config.handle_domain; |
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255 local validate_domain = self.config.validate_domain; |
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256 if handle_domain == "split" then |
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257 local domain; |
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258 self.username, domain = prepped_split(data.user); |
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259 if validate_domain and domain ~= self.realm then |
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260 return "failure", "not-authorized", "Domain mismatch"; |
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261 end |
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262 elseif handle_domain == "escape" then |
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263 self.username = nodeprep(jid_escape(data.user)); |
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264 else |
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265 self.username = nodeprep(data.user); |
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266 end |
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267 if not self.username then |
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268 return "failure", "not-authorized", "Username failed NODEprep" |
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269 end |
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270 end |
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271 |
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272 if resp == "FAIL" then |
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273 if data.temp then |
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274 return "failure", "temporary-auth-failure", data.reason; |
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275 elseif data.authz then |
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276 return "failure", "invalid-authzid", data.reason; |
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277 else |
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278 return "failure", "not-authorized", data.reason; |
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279 end |
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280 elseif resp == "CONT" then |
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281 return "challenge", unb64(data[1]); |
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282 elseif resp == "OK" then |
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283 return "success", data.resp and unb64(data.resp) or nil; |
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284 end |
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285 end |
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286 |
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287 return _M; |