prosody
1644ab13a4ca
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 3463:1644ab13a4ca

mod_saslauth: Get rid of most Cyrus SASL related code (use authentication='cyrus' instead).
author Waqas Hussain <waqas20@gmail.com>
date Mon, 23 Aug 2010 16:22:58 +0500
parent 3418:e75af8e6af54
child 3464:72cd7a785014
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rev   line source
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diff changeset
1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 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 sm_make_authenticated = require "core.sessionmanager".make_authenticated;
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14 local base64 = require "util.encodings".base64;
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15
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16 local nodeprep = require "util.encodings".stringprep.nodeprep;
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17 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
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18 local usermanager_user_exists = require "core.usermanager".user_exists;
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19 local t_concat, t_insert = table.concat, table.insert;
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20 local tostring = tostring;
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21
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22 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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23 local sasl_backend = module:get_option("sasl_backend") or "builtin";
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24 local anonymous_login = module:get_option("anonymous_login");
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25 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth")
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27 -- Cyrus config options
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28 local require_provisioning = module:get_option("cyrus_require_provisioning") or false;
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29
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30 local log = module._log;
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31
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32 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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33 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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34 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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36 local new_sasl = require "util.sasl".new;
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37 if sasl_backend ~= "builtin" then
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38 module:log("error", "Unknown SASL backend: %s", sasl_backend);
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39 error("Unknown SASL backend");
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40 end
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42 local anonymous_authentication_profile = {
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43 anonymous = function(username, realm)
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44 return true; -- for normal usage you should always return true here
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45 end
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46 };
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47
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48 local function build_reply(status, ret, err_msg)
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49 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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50 if status == "challenge" then
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51 --log("debug", "CHALLENGE: %s", ret or "");
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52 reply:text(base64.encode(ret or ""));
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53 elseif status == "failure" then
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54 reply:tag(ret):up();
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55 if err_msg then reply:tag("text"):text(err_msg); end
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56 elseif status == "success" then
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57 --log("debug", "SUCCESS: %s", ret or "");
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58 reply:text(base64.encode(ret or ""));
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59 else
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60 module:log("error", "Unknown sasl status: %s", status);
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61 end
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62 return reply;
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63 end
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64
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65 local function handle_status(session, status, ret, err_msg)
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66 if status == "failure" then
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67 session.sasl_handler = session.sasl_handler:clean_clone();
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68 elseif status == "success" then
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69 local username = nodeprep(session.sasl_handler.username);
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70
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71 if not(require_provisioning) or usermanager_user_exists(username, session.host) then
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72 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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73 if ok then
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74 session.sasl_handler = nil;
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75 session:reset_stream();
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76 else
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77 module:log("warn", "SASL succeeded but username was invalid");
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78 session.sasl_handler = session.sasl_handler:clean_clone();
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79 return "failure", "not-authorized", "User authenticated successfully, but username was invalid";
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80 end
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81 else
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82 module:log("warn", "SASL succeeded but we don't have an account provisioned for %s", username);
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83 session.sasl_handler = session.sasl_handler:clean_clone();
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84 return "failure", "not-authorized", "User authenticated successfully, but not provisioned for XMPP";
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85 end
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86 end
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87 return status, ret, err_msg;
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88 end
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89
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90 local function sasl_handler(session, stanza)
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91 if stanza.name == "auth" then
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92 -- FIXME ignoring duplicates because ejabberd does
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93 local mechanism = stanza.attr.mechanism;
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94 if anonymous_login then
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95 if mechanism ~= "ANONYMOUS" then
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96 return session.send(build_reply("failure", "invalid-mechanism"));
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97 end
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98 elseif mechanism == "ANONYMOUS" then
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99 return session.send(build_reply("failure", "mechanism-too-weak"));
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100 end
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101 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then
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102 return session.send(build_reply("failure", "encryption-required"));
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103 end
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104 local valid_mechanism = session.sasl_handler:select(mechanism);
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105 if not valid_mechanism then
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106 return session.send(build_reply("failure", "invalid-mechanism"));
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107 end
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108 elseif not session.sasl_handler then
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109 return; -- FIXME ignoring out of order stanzas because ejabberd does
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110 end
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111 local text = stanza[1];
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112 if text then
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113 text = base64.decode(text);
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114 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
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115 if not text then
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116 session.sasl_handler = nil;
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117 session.send(build_reply("failure", "incorrect-encoding"));
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118 return;
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119 end
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120 end
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121 local status, ret, err_msg = session.sasl_handler:process(text);
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892c49869293 mod_saslauth: Add return value and error message to the Cyrus SASL handle_status callback
Matthew Wild <mwild1@gmail.com>
parents: 3061
diff changeset
122 status, ret, err_msg = handle_status(session, status, ret, err_msg);
1584
ffe8a9296e04 mod_saslauth, usermanager: Fetch list of mechanisms from usermanager
Nick Thomas
parents: 1523
diff changeset
123 local s = build_reply(status, ret, err_msg);
1072
c7967004b5d0 mod_saslauth: Various logging fixes
Matthew Wild <mwild1@gmail.com>
parents: 1071
diff changeset
124 log("debug", "sasl reply: %s", tostring(s));
288
dc53343af9ac Set username in a SASL object.
Tobias Markmann <tm@ayena.de>
parents: 286
diff changeset
125 session.send(s);
284
4f540755260c mod_saslauth: Added base64 decoding, encoding check, and cleaned the code up.
Waqas Hussain <waqas20@gmail.com>
parents: 281
diff changeset
126 end
4f540755260c mod_saslauth: Added base64 decoding, encoding check, and cleaned the code up.
Waqas Hussain <waqas20@gmail.com>
parents: 281
diff changeset
127
438
193f9dd64f17 Bumper commit for the new modulemanager API \o/ Updates all the modules, though some more changes may be in store.
Matthew Wild <mwild1@gmail.com>
parents: 357
diff changeset
128 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
193f9dd64f17 Bumper commit for the new modulemanager API \o/ Updates all the modules, though some more changes may be in store.
Matthew Wild <mwild1@gmail.com>
parents: 357
diff changeset
129 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
193f9dd64f17 Bumper commit for the new modulemanager API \o/ Updates all the modules, though some more changes may be in store.
Matthew Wild <mwild1@gmail.com>
parents: 357
diff changeset
130 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
284
4f540755260c mod_saslauth: Added base64 decoding, encoding check, and cleaned the code up.
Waqas Hussain <waqas20@gmail.com>
parents: 281
diff changeset
131
357
17bcecb06420 Use a stanza for c2s stream features instead of an array of strings. Removes a FIXME.
Matthew Wild <mwild1@gmail.com>
parents: 313
diff changeset
132 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
17bcecb06420 Use a stanza for c2s stream features instead of an array of strings. Removes a FIXME.
Matthew Wild <mwild1@gmail.com>
parents: 313
diff changeset
133 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
17bcecb06420 Use a stanza for c2s stream features instead of an array of strings. Removes a FIXME.
Matthew Wild <mwild1@gmail.com>
parents: 313
diff changeset
134 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
2612
475552b04151 mod_saslauth: Hook stream-features event using new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2451
diff changeset
135 module:hook("stream-features", function(event)
475552b04151 mod_saslauth: Hook stream-features event using new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2451
diff changeset
136 local origin, features = event.origin, event.features;
475552b04151 mod_saslauth: Hook stream-features event using new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2451
diff changeset
137 if not origin.username then
475552b04151 mod_saslauth: Hook stream-features event using new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2451
diff changeset
138 if secure_auth_only and not origin.secure then
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
139 return;
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
140 end
3385
192ffdaef491 mod_saslauth: A little cleanup for anonymous_login.
Waqas Hussain <waqas20@gmail.com>
parents: 3363
diff changeset
141 if anonymous_login then
3391
8ac3f60af3c4 mod_saslauth: Got rid of undocumented and useless 'sasl_realm' config option (was only used for anonymous auth, and that didn't make sense).
Waqas Hussain <waqas20@gmail.com>
parents: 3386
diff changeset
142 origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile);
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
143 else
3188
c690e3c5105c mod_saslauth: Updated to use usermanager.get_sasl_handler.
Waqas Hussain <waqas20@gmail.com>
parents: 3178
diff changeset
144 origin.sasl_handler = usermanager_get_sasl_handler(module.host);
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
145 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
146 features:tag("mechanisms", mechanisms_attr);
3417
53e854b52110 mod_saslauth: Check for unencrypted PLAIN auth in mod_saslauth instead of the SASL handler (makes it work for Cyrus SASL).
Waqas Hussain <waqas20@gmail.com>
parents: 3416
diff changeset
147 for mechanism in pairs(origin.sasl_handler:mechanisms()) do
53e854b52110 mod_saslauth: Check for unencrypted PLAIN auth in mod_saslauth instead of the SASL handler (makes it work for Cyrus SASL).
Waqas Hussain <waqas20@gmail.com>
parents: 3416
diff changeset
148 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then
53e854b52110 mod_saslauth: Check for unencrypted PLAIN auth in mod_saslauth instead of the SASL handler (makes it work for Cyrus SASL).
Waqas Hussain <waqas20@gmail.com>
parents: 3416
diff changeset
149 features:tag("mechanism"):text(mechanism):up();
53e854b52110 mod_saslauth: Check for unencrypted PLAIN auth in mod_saslauth instead of the SASL handler (makes it work for Cyrus SASL).
Waqas Hussain <waqas20@gmail.com>
parents: 3416
diff changeset
150 end
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
151 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
152 features:up();
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
153 else
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
154 features:tag("bind", bind_attr):tag("required"):up():up();
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
155 features:tag("session", xmpp_session_attr):tag("optional"):up():up();
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
156 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
157 end);
1584
ffe8a9296e04 mod_saslauth, usermanager: Fetch list of mechanisms from usermanager
Nick Thomas
parents: 1523
diff changeset
158
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
159 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", function(session, stanza)
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
160 log("debug", "Client requesting a resource bind");
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
161 local resource;
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
162 if stanza.attr.type == "set" then
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
163 local bind = stanza.tags[1];
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
164 if bind and bind.attr.xmlns == xmlns_bind then
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
165 resource = bind:child_with_name("resource");
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
166 if resource then
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
167 resource = resource[1];
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
168 end
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
169 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
170 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
171 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
172 if not success then
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
173 session.send(st.error_reply(stanza, err_type, err, err_msg));
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
174 else
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
175 session.send(st.reply(stanza)
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
176 :tag("bind", { xmlns = xmlns_bind})
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
177 :tag("jid"):text(session.full_jid));
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
178 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
179 end);
1584
ffe8a9296e04 mod_saslauth, usermanager: Fetch list of mechanisms from usermanager
Nick Thomas
parents: 1523
diff changeset
180
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
181 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", function(session, stanza)
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
182 log("debug", "Client requesting a session");
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
183 session.send(st.reply(stanza));
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
184 end);