prosody
663f75dd7b42
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 938:663f75dd7b42

Fixed: Some nil access bugs
author Waqas Hussain <waqas20@gmail.com>
date Mon, 30 Mar 2009 05:26:10 +0500
parent 935:efe3eaaeff34
child 1042:a3d77353c18a
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rev   line source
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2c0b9e3c11c3 0.3->0.4
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1 -- Prosody IM v0.4
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90ce865eebd8 Update copyright notices for 2009
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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 local config = require "core.configmanager";
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21
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22 local log = require "util.logger".init("mod_saslauth");
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23
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24 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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25 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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26 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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27
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28 local new_sasl = require "util.sasl".new;
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29
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30 local function build_reply(status, ret, err_msg)
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31 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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32 if status == "challenge" then
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33 log("debug", ret or "");
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34 reply:text(base64.encode(ret or ""));
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35 elseif status == "failure" then
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36 reply:tag(ret):up();
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37 if err_msg then reply:tag("text"):text(err_msg); end
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38 elseif status == "success" then
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39 log("debug", ret or "");
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40 reply:text(base64.encode(ret or ""));
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41 else
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42 error("Unknown sasl status: "..status);
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43 end
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44 return reply;
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45 end
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46
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47 local function handle_status(session, status)
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48 if status == "failure" then
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49 session.sasl_handler = nil;
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50 elseif status == "success" then
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51 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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52 sessionmanager.make_authenticated(session, session.sasl_handler.username);
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53 session.sasl_handler = nil;
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54 session:reset_stream();
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55 end
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56 end
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57
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58 local function password_callback(node, host, mechanism, decoder)
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59 local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords
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60 local func = function(x) return x; end;
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61 if password then
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62 if mechanism == "PLAIN" then
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63 return func, password;
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64 elseif mechanism == "DIGEST-MD5" then
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65 if decoder then node, host, password = decoder(node), decoder(host), decoder(password); end
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66 return func, md5(node..":"..host..":"..password);
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67 end
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68 end
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69 return func, nil;
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70 end
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71
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72 local function sasl_handler(session, stanza)
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73 if stanza.name == "auth" then
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74 -- FIXME ignoring duplicates because ejabberd does
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75 if config.get(session.host or "*", "core", "anonymous_login") and stanza.attr.mechanism ~= "ANONYMOUS" then
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76 return session.send(build_reply("failure", "invalid-mechanism"));
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77 elseif stanza.attr.mechanism == "ANONYMOUS" then
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78 return session.send(build_reply("failure", "mechanism-too-weak"));
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79 end
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80 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
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81 if not session.sasl_handler then
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82 return session.send(build_reply("failure", "invalid-mechanism"));
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83 end
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84 elseif not session.sasl_handler then
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85 return; -- FIXME ignoring out of order stanzas because ejabberd does
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86 end
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87 local text = stanza[1];
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88 if text then
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89 text = base64.decode(text);
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90 log("debug", text);
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91 if not text then
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92 session.sasl_handler = nil;
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93 session.send(build_reply("failure", "incorrect-encoding"));
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94 return;
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95 end
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96 end
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97 local status, ret, err_msg = session.sasl_handler:feed(text);
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98 handle_status(session, status);
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99 local s = build_reply(status, ret, err_msg);
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100 log("debug", "sasl reply: "..tostring(s));
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101 session.send(s);
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102 end
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103
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104 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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105 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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106 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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107
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108 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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109 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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110 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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111 module:add_event_hook("stream-features",
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112 function (session, features)
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113 if not session.username then
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114 features:tag("mechanisms", mechanisms_attr);
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115 -- 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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116 if config.get(session.host or "*", "core", "anonymous_login") then
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117 features:tag("mechanism"):text("ANONYMOUS"):up();
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118 else
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119 features:tag("mechanism"):text("DIGEST-MD5"):up();
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120 features:tag("mechanism"):text("PLAIN"):up();
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121 end
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122 features:up();
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123 else
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124 features:tag("bind", bind_attr):tag("required"):up():up();
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125 features:tag("session", xmpp_session_attr):up();
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126 end
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127 end);
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128
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129 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
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130 function (session, stanza)
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131 log("debug", "Client tried to bind to a resource");
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132 local resource;
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133 if stanza.attr.type == "set" then
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134 local bind = stanza.tags[1];
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135 if bind and bind.attr.xmlns == xmlns_bind then
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136 resource = bind:child_with_name("resource");
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137 if resource then
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138 resource = resource[1];
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139 end
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140 end
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141 end
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142 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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143 if not success then
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144 session.send(st.error_reply(stanza, err_type, err, err_msg));
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145 else
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146 session.send(st.reply(stanza)
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147 :tag("bind", { xmlns = xmlns_bind})
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148 :tag("jid"):text(session.full_jid));
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149 end
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150 end);
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151
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152 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
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153 function (session, stanza)
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154 log("debug", "Client tried to bind to a resource");
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155 session.send(st.reply(stanza));
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156 end);