prosody
0.3.0
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 767:13ae298c67d7 0.3.0

Update COPYING file... probably the worst thing I could forget to commit in this release :)
author Matthew Wild <mwild1@gmail.com>
date Mon, 02 Feb 2009 18:04:13 +0000
parent 760:90ce865eebd8
child 799:b7ea802f3527
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1 -- Prosody IM v0.3
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10
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11 local st = require "util.stanza";
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12 local sm_bind_resource = require "core.sessionmanager".bind_resource;
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13 local base64 = require "util.encodings".base64;
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14
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15 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
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16 local t_concat, t_insert = table.concat, table.insert;
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17 local tostring = tostring;
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18 local jid_split = require "util.jid".split
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19 local md5 = require "util.hashes".md5;
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20
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21 local log = require "util.logger".init("mod_saslauth");
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22
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23 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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24 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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25 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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27 local new_sasl = require "util.sasl".new;
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29 local function build_reply(status, ret, err_msg)
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30 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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31 if status == "challenge" then
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32 log("debug", ret or "");
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33 reply:text(base64.encode(ret or ""));
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34 elseif status == "failure" then
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35 reply:tag(ret):up();
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36 if err_msg then reply:tag("text"):text(err_msg); end
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37 elseif status == "success" then
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38 log("debug", ret or "");
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39 reply:text(base64.encode(ret or ""));
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40 else
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41 error("Unknown sasl status: "..status);
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42 end
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43 return reply;
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44 end
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45
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46 local function handle_status(session, status)
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47 if status == "failure" then
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48 session.sasl_handler = nil;
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49 elseif status == "success" then
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50 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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51 sessionmanager.make_authenticated(session, session.sasl_handler.username);
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52 session.sasl_handler = nil;
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53 session:reset_stream();
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54 end
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55 end
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56
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57 local function password_callback(node, host, mechanism, decoder)
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58 local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords
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59 local func = function(x) return x; end;
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60 if password then
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61 if mechanism == "PLAIN" then
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62 return func, password;
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63 elseif mechanism == "DIGEST-MD5" then
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64 if decoder then node, host, password = decoder(node), decoder(host), decoder(password); end
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65 return func, md5(node..":"..host..":"..password);
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66 end
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67 end
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68 return func, nil;
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69 end
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70
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71 local function sasl_handler(session, stanza)
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72 if stanza.name == "auth" then
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73 -- FIXME ignoring duplicates because ejabberd does
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74 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
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75 elseif not session.sasl_handler then
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76 return; -- FIXME ignoring out of order stanzas because ejabberd does
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77 end
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78 local text = stanza[1];
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79 if text then
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80 text = base64.decode(text);
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81 log("debug", text);
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82 if not text then
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83 session.sasl_handler = nil;
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84 session.send(build_reply("failure", "incorrect-encoding"));
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85 return;
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86 end
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87 end
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88 local status, ret, err_msg = session.sasl_handler:feed(text);
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89 handle_status(session, status);
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90 local s = build_reply(status, ret, err_msg);
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91 log("debug", "sasl reply: "..tostring(s));
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92 session.send(s);
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93 end
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94
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95 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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96 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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97 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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98
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99 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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100 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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101 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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102 module:add_event_hook("stream-features",
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103 function (session, features)
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104 if not session.username then
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105 features:tag("mechanisms", mechanisms_attr);
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106 -- 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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107 features:tag("mechanism"):text("PLAIN"):up();
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108 features:tag("mechanism"):text("DIGEST-MD5"):up();
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109 features:up();
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110 else
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111 features:tag("bind", bind_attr):tag("required"):up():up();
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112 features:tag("session", xmpp_session_attr):up();
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113 end
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114 end);
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115
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116 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
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117 function (session, stanza)
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118 log("debug", "Client tried to bind to a resource");
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119 local resource;
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120 if stanza.attr.type == "set" then
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121 local bind = stanza.tags[1];
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122 if bind and bind.attr.xmlns == xmlns_bind then
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123 resource = bind:child_with_name("resource");
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124 if resource then
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125 resource = resource[1];
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126 end
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127 end
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128 end
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129 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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130 if not success then
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131 session.send(st.error_reply(stanza, err_type, err, err_msg));
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132 else
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133 session.send(st.reply(stanza)
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134 :tag("bind", { xmlns = xmlns_bind})
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135 :tag("jid"):text(session.full_jid));
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136 end
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137 end);
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138
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139 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
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140 function (session, stanza)
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141 log("debug", "Client tried to bind to a resource");
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142 session.send(st.reply(stanza));
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143 end);