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plugins/mod_saslauth.lua @ 288:dc53343af9ac
Set username in a SASL object.
author | Tobias Markmann <tm@ayena.de> |
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date | Sat, 15 Nov 2008 20:28:09 +0100 (2008-11-15) |
parent | 286:7e4908d4bdf6 |
child | 289:3c8a28c1f331 |
rev | line source |
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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; |
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10 local jid_split = require "util.jid".split |
38 | 11 |
12 local log = require "util.logger".init("mod_saslauth"); | |
13 | |
14 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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15 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
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16 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; |
38 | 17 |
18 local new_sasl = require "util.sasl".new; | |
19 | |
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20 local function build_reply(status, ret) |
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21 local reply = st.stanza(status, {xmlns = xmlns_sasl}); |
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22 if status == "challenge" then |
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23 reply:text(ret or ""); |
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24 elseif status == "failure" then |
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25 reply:tag(ret):up(); |
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26 elseif status == "success" then |
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27 reply:text(ret or ""); |
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28 else |
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29 error("Unknown sasl status: "..status); |
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30 end |
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31 return reply; |
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32 end |
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33 |
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34 local function handle_status(session, status) |
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35 if status == "failure" then |
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36 session.sasl_handler = nil; |
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37 elseif status == "success" then |
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38 session.sasl_handler = nil; |
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39 session:reset_stream(); |
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40 end |
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41 end |
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42 |
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43 local function password_callback(jid, mechanism) |
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44 local node, host = jid_split(jid); |
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45 local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords |
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46 local func = function(x) return x; end; |
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47 if password then |
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48 if mechanism == "PLAIN" then |
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49 return func, password; |
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50 elseif mechanism == "DIGEST-MD5" then |
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51 return func, require "hashes".md5(node.."::"..password); |
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52 end |
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53 end |
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54 return func, nil; |
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55 end |
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56 |
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57 function do_sasl(session, stanza) |
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58 local text = stanza[1]; |
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59 if text then |
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60 text = base64.decode(text); |
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61 if not text then |
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62 session.sasl_handler = nil; |
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63 session.send(build_reply("failure", "incorrect-encoding")); |
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64 return; |
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65 end |
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66 end |
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67 local status, ret = session.sasl_handler:feed(text); |
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68 handle_status(session, status); |
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69 local s = build_reply(status, ret); |
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70 log("debug", "sasl reply: "..tostring(s)); |
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71 session.send(s); |
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72 end |
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73 |
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74 add_handler("c2s_unauthed", "auth", xmlns_sasl, |
38 | 75 function (session, stanza) |
76 if not session.sasl_handler then | |
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77 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback); |
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78 do_sasl(session, stanza); |
38 | 79 else |
80 error("Client tried to negotiate SASL again", 0); | |
81 end | |
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82 end); |
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83 |
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84 add_handler("c2s_unauthed", "abort", xmlns_sasl, |
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85 function(session, stanza) |
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86 if not session.sasl_handler then error("Attempt to abort when sasl has not started"); end |
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87 do_sasl(session, stanza); |
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88 end); |
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89 |
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90 add_handler("c2s_unauthed", "response", xmlns_sasl, |
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91 function(session, stanza) |
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92 if not session.sasl_handler then error("Attempt to respond when sasl has not started"); end |
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93 do_sasl(session, stanza); |
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94 end); |
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95 |
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96 add_event_hook("stream-features", |
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97 function (session, features) |
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98 if not session.username then |
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99 t_insert(features, "<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>"); |
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100 -- 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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101 t_insert(features, "<mechanism>PLAIN</mechanism>"); |
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102 t_insert(features, "<mechanism>DIGEST-MD5</mechanism>"); |
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103 t_insert(features, "</mechanisms>"); |
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104 else |
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105 t_insert(features, "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><required/></bind>"); |
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106 t_insert(features, "<session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>"); |
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107 end |
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108 --send [[<register xmlns="http://jabber.org/features/iq-register"/> ]] |
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109 end); |
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110 |
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111 add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", |
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112 function (session, stanza) |
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113 log("debug", "Client tried to bind to a resource"); |
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114 local resource; |
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115 if stanza.attr.type == "set" then |
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116 local bind = stanza.tags[1]; |
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117 |
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118 if bind and bind.attr.xmlns == xmlns_bind then |
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119 resource = bind:child_with_name("resource"); |
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120 if resource then |
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121 resource = resource[1]; |
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122 end |
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123 end |
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124 end |
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125 local success, err = sm_bind_resource(session, resource); |
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126 if not success then |
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127 local reply = st.reply(stanza); |
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128 reply.attr.type = "error"; |
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129 if err == "conflict" then |
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130 reply:tag("error", { type = "modify" }) |
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131 :tag("conflict", { xmlns = xmlns_stanzas }); |
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132 elseif err == "constraint" then |
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133 reply:tag("error", { type = "cancel" }) |
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134 :tag("resource-constraint", { xmlns = xmlns_stanzas }); |
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135 elseif err == "auth" then |
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136 reply:tag("error", { type = "cancel" }) |
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137 :tag("not-allowed", { xmlns = xmlns_stanzas }); |
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138 end |
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139 send(session, reply); |
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140 else |
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141 local reply = st.reply(stanza); |
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142 reply:tag("bind", { xmlns = xmlns_bind}) |
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143 :tag("jid"):text(session.full_jid); |
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144 send(session, reply); |
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145 end |
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146 end); |
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147 |
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148 add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", |
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149 function (session, stanza) |
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150 log("debug", "Client tried to bind to a resource"); |
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151 send(session, st.reply(stanza)); |
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152 end); |