prosody
30655c5cc531
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 599:30655c5cc531

Latin1 support for SASL DIGEST-MD5 (second, and possibly final commit)
author Waqas Hussain <waqas20@gmail.com>
date Mon, 08 Dec 2008 00:18:01 +0500
parent 595:08ed4fa2f89d
child 615:4ae3e81513f3
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1 -- Prosody IM v0.1
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
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5 -- This program is free software; you can redistribute it and/or
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6 -- modify it under the terms of the GNU General Public License
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7 -- as published by the Free Software Foundation; either version 2
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8 -- of the License, or (at your option) any later version.
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9 --
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10 -- This program is distributed in the hope that it will be useful,
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 -- GNU General Public License for more details.
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14 --
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15 -- You should have received a copy of the GNU General Public License
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16 -- along with this program; if not, write to the Free Software
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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18 --
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19
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20
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21
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22 local st = require "util.stanza";
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23 local sm_bind_resource = require "core.sessionmanager".bind_resource;
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24 local jid
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25 local base64 = require "util.encodings".base64;
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26
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27 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
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28 local t_concat, t_insert = table.concat, table.insert;
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29 local tostring = tostring;
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30 local jid_split = require "util.jid".split
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31 local md5 = require "util.hashes".md5;
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33 local log = require "util.logger".init("mod_saslauth");
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34
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35 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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36 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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37 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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39 local new_sasl = require "util.sasl".new;
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40
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41 local function build_reply(status, ret, err_msg)
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42 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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43 if status == "challenge" then
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44 log("challenge", ret or "");
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45 reply:text(base64.encode(ret or ""));
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46 elseif status == "failure" then
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47 reply:tag(ret):up();
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48 if err_msg then reply:tag("text"):text(err_msg); end
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49 elseif status == "success" then
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50 log("success", ret or "");
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51 reply:text(base64.encode(ret or ""));
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52 else
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53 error("Unknown sasl status: "..status);
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54 end
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55 return reply;
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56 end
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57
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58 local function handle_status(session, status)
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59 if status == "failure" then
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60 session.sasl_handler = nil;
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61 elseif status == "success" then
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62 if not session.sasl_handler.username then error("SASL succeeded but we didn't get a username!"); end -- TODO move this to sessionmanager
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63 sessionmanager.make_authenticated(session, session.sasl_handler.username);
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64 session.sasl_handler = nil;
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65 session:reset_stream();
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66 end
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67 end
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68
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69 local function password_callback(node, host, mechanism, decoder)
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70 local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords
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71 local func = function(x) return x; end;
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72 if password then
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73 if mechanism == "PLAIN" then
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74 return func, password;
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75 elseif mechanism == "DIGEST-MD5" then
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76 if decoder then node, host, password = decoder(node), decoder(host), decoder(password); end
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77 return func, md5(node..":"..host..":"..password);
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78 end
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79 end
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80 return func, nil;
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81 end
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82
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83 function sasl_handler(session, stanza)
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84 if stanza.name == "auth" then
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85 -- FIXME ignoring duplicates because ejabberd does
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86 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
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87 elseif not session.sasl_handler then
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88 return; -- FIXME ignoring out of order stanzas because ejabberd does
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89 end
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90 local text = stanza[1];
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91 if text then
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92 text = base64.decode(text);
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93 log("recieved", text);
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94 if not text then
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95 session.sasl_handler = nil;
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96 session.send(build_reply("failure", "incorrect-encoding"));
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97 return;
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98 end
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99 end
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100 local status, ret, err_msg = session.sasl_handler:feed(text);
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101 handle_status(session, status);
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102 local s = build_reply(status, ret, err_msg);
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103 log("debug", "sasl reply: "..tostring(s));
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104 session.send(s);
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105 end
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106
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107 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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108 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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109 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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110
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111 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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112 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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113 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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114 module:add_event_hook("stream-features",
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115 function (session, features)
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116 if not session.username then
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117 features:tag("mechanisms", mechanisms_attr);
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118 -- TODO: Provide PLAIN only if TLS is active, this is a SHOULD from the introduction of RFC 4616. This behavior could be overridden via configuration but will issuing a warning or so.
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119 features:tag("mechanism"):text("PLAIN"):up();
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120 features:tag("mechanism"):text("DIGEST-MD5"):up();
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121 features:up();
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122 else
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123 features:tag("bind", bind_attr):tag("required"):up():up();
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124 features:tag("session", xmpp_session_attr):up();
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125 end
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126 end);
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127
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128 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
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129 function (session, stanza)
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130 log("debug", "Client tried to bind to a resource");
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131 local resource;
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132 if stanza.attr.type == "set" then
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133 local bind = stanza.tags[1];
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134 if bind and bind.attr.xmlns == xmlns_bind then
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135 resource = bind:child_with_name("resource");
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136 if resource then
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137 resource = resource[1];
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138 end
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139 end
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140 end
304
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141 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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142 if not success then
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143 session.send(st.error_reply(stanza, err_type, err, err_msg));
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144 else
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145 session.send(st.reply(stanza)
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146 :tag("bind", { xmlns = xmlns_bind})
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147 :tag("jid"):text(session.full_jid));
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148 end
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149 end);
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150
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151 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
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152 function (session, stanza)
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153 log("debug", "Client tried to bind to a resource");
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154 session.send(st.reply(stanza));
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155 end);