Sat, 15 Nov 2008 19:12:05 +0100
Adding some TODO for some security issue.
38 | 1 | |
2 | local st = require "util.stanza"; | |
3 | local send = require "core.sessionmanager".send_to_session; | |
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4 | local sm_bind_resource = require "core.sessionmanager".bind_resource; |
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5 | local jid |
38 | 6 | |
7 | local usermanager_validate_credentials = require "core.usermanager".validate_credentials; | |
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8 | local t_concat, t_insert = table.concat, table.insert; |
38 | 9 | local tostring = tostring; |
10 | ||
11 | local log = require "util.logger".init("mod_saslauth"); | |
12 | ||
13 | local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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14 | local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
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15 | local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; |
38 | 16 | |
17 | local new_sasl = require "util.sasl".new; | |
18 | ||
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19 | local function build_reply(status, ret) |
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20 | local reply = st.stanza(status, {xmlns = xmlns_sasl}); |
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21 | if status == "challenge" then |
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22 | reply:text(ret or ""); |
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23 | elseif status == "failure" then |
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24 | reply:tag(ret):up(); |
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25 | elseif status == "success" then |
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26 | reply:text(ret or ""); |
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27 | else |
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28 | error("Unknown sasl status: "..status); |
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29 | end |
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30 | return reply; |
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31 | end |
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32 | |
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33 | local function handle_status(session, status) |
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34 | if status == "failure" then |
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35 | session.sasl_handler = nil; |
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36 | elseif status == "success" then |
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37 | session.sasl_handler = nil; |
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38 | session:reset_stream(); |
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39 | end |
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40 | end |
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41 | |
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42 | local function password_callback(jid, mechanism) |
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43 | local node, host = jid_split(jid); |
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44 | local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords |
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45 | local func = function(x) return x; end; |
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46 | if password then |
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47 | if mechanism == "PLAIN" then |
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48 | return func, password; |
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49 | elseif mechanism == "DIGEST-MD5" then |
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50 | return func, require "hashes".md5(node.."::"..password); |
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51 | end |
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52 | end |
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53 | return func, nil; |
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54 | end |
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55 | |
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56 | add_handler("c2s_unauthed", "auth", xmlns_sasl, |
38 | 57 | function (session, stanza) |
58 | if not session.sasl_handler then | |
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59 | session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback); |
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60 | local status, ret = session.sasl_handler:feed(stanza[1]); |
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61 | handle_status(session, status); |
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62 | session.send(build_reply(status, ret)); |
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63 | --[[session.sasl_handler = new_sasl(stanza.attr.mechanism, |
38 | 64 | function (username, password) |
65 | -- onAuth | |
66 | require "core.usermanager" | |
67 | if usermanager_validate_credentials(session.host, username, password) then | |
68 | return true; | |
69 | end | |
70 | return false; | |
71 | end, | |
72 | function (username) | |
73 | -- onSuccess | |
74 | local success, err = sessionmanager.make_authenticated(session, username); | |
75 | if not success then | |
76 | sessionmanager.destroy_session(session); | |
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77 | return; |
38 | 78 | end |
79 | session.sasl_handler = nil; | |
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80 | session:reset_stream(); |
38 | 81 | end, |
82 | function (reason) | |
83 | -- onFail | |
84 | log("debug", "SASL failure, reason: %s", reason); | |
85 | end, | |
86 | function (stanza) | |
87 | -- onWrite | |
88 | log("debug", "SASL writes: %s", tostring(stanza)); | |
89 | send(session, stanza); | |
90 | end | |
91 | ); | |
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92 | session.sasl_handler:feed(stanza); ]] |
38 | 93 | else |
94 | error("Client tried to negotiate SASL again", 0); | |
95 | end | |
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96 | end); |
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97 | |
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98 | add_handler("c2s_unauthed", "abort", xmlns_sasl, |
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99 | function(session, stanza) |
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100 | if not session.sasl_handler then error("Attempt to abort when sasl has not started"); end |
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101 | local status, ret = session.sasl_handler:feed(stanza[1]); |
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102 | handle_status(session, status); |
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103 | session.send(build_reply(status, ret)); |
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104 | end); |
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105 | |
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106 | add_handler("c2s_unauthed", "response", xmlns_sasl, |
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107 | function(session, stanza) |
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108 | if not session.sasl_handler then error("Attempt to respond when sasl has not started"); end |
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109 | local status, ret = session.sasl_handler:feed(stanza[1]); |
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110 | handle_status(session, status); |
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111 | session.send(build_reply(status, ret)); |
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112 | end); |
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113 | |
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114 | 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 | t_insert(features, "<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>"); |
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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 | t_insert(features, "<mechanism>PLAIN</mechanism>"); |
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120 | t_insert(features, "<mechanism>DIGEST-MD5</mechanism>"); |
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121 | t_insert(features, "</mechanisms>"); |
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122 | else |
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123 | t_insert(features, "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><required/></bind>"); |
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124 | t_insert(features, "<session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>"); |
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125 | end |
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126 | --send [[<register xmlns="http://jabber.org/features/iq-register"/> ]] |
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127 | end); |
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128 | |
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129 | 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 | |
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136 | if bind and bind.attr.xmlns == xmlns_bind then |
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137 | resource = bind:child_with_name("resource"); |
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138 | if resource then |
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139 | resource = resource[1]; |
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140 | end |
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141 | end |
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142 | end |
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143 | local success, err = sm_bind_resource(session, resource); |
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144 | if not success then |
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145 | local reply = st.reply(stanza); |
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146 | reply.attr.type = "error"; |
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147 | if err == "conflict" then |
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148 | reply:tag("error", { type = "modify" }) |
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149 | :tag("conflict", { xmlns = xmlns_stanzas }); |
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150 | elseif err == "constraint" then |
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151 | reply:tag("error", { type = "cancel" }) |
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152 | :tag("resource-constraint", { xmlns = xmlns_stanzas }); |
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153 | elseif err == "auth" then |
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154 | reply:tag("error", { type = "cancel" }) |
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155 | :tag("not-allowed", { xmlns = xmlns_stanzas }); |
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156 | end |
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157 | send(session, reply); |
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158 | else |
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159 | local reply = st.reply(stanza); |
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160 | reply:tag("bind", { xmlns = xmlns_bind}) |
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161 | :tag("jid"):text(session.full_jid); |
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162 | send(session, reply); |
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163 | end |
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164 | end); |
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165 | |
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166 | add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", |
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167 | function (session, stanza) |
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168 | log("debug", "Client tried to bind to a resource"); |
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169 | send(session, st.reply(stanza)); |
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170 | end); |