prosody
fdb43fc1bafc
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 1846:fdb43fc1bafc

mod_saslauth: Prep username used for authenticating a session
author Matthew Wild <mwild1@gmail.com>
date Tue, 29 Sep 2009 19:54:31 +0100
parent 1721:1dcfb2c64302
child 1847:1842da566c7d
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1 -- Prosody IM
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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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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 local nodeprep = require "util.encodings".stringprep.nodeprep;
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16 local datamanager_load = require "util.datamanager".load;
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17 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
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18 local t_concat, t_insert = table.concat, table.insert;
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19 local tostring = tostring;
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20 local jid_split = require "util.jid".split
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21 local md5 = require "util.hashes".md5;
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22 local config = require "core.configmanager";
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23
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24 local secure_auth_only = config.get(module:get_host(), "core", "require_encryption");
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26 local log = module._log;
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27
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28 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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29 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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30 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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32 local new_sasl = require "util.sasl".new;
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33
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34 local function build_reply(status, ret, err_msg)
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35 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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36 if status == "challenge" then
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37 log("debug", "%s", ret or "");
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38 reply:text(base64.encode(ret or ""));
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39 elseif status == "failure" then
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40 reply:tag(ret):up();
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41 if err_msg then reply:tag("text"):text(err_msg); end
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42 elseif status == "success" then
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43 log("debug", "%s", ret or "");
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44 reply:text(base64.encode(ret or ""));
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45 else
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46 module:log("error", "Unknown sasl status: %s", status);
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47 end
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48 return reply;
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49 end
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50
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51 local function handle_status(session, status)
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52 if status == "failure" then
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53 session.sasl_handler = nil;
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54 elseif status == "success" then
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55 local username = nodeprep(session.sasl_handler.username);
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56 session.sasl_handler = nil;
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57 if not username then -- TODO move this to sessionmanager
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58 module:log("warn", "SASL succeeded but we didn't get a username!");
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59 session:reset_stream();
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60 return;
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61 end
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62 sm_make_authenticated(session, username);
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63 session:reset_stream();
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64 end
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65 end
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66
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67 local function password_callback(node, hostname, realm, mechanism, decoder)
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68 local func = function(x) return x; end;
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69 local node = nodeprep(node);
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70 if not node then
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71 return func, nil;
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72 end
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73 local password = (datamanager_load(node, hostname, "accounts") or {}).password; -- FIXME handle hashed passwords
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74 if password then
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75 if mechanism == "PLAIN" then
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76 return func, password;
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77 elseif mechanism == "DIGEST-MD5" then
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78 if decoder then node, realm, password = decoder(node), decoder(realm), decoder(password); end
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79 return func, md5(node..":"..realm..":"..password);
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80 end
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81 end
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82 return func, nil;
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83 end
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84
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85 local function sasl_handler(session, stanza)
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86 if stanza.name == "auth" then
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87 -- FIXME ignoring duplicates because ejabberd does
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88 if config.get(session.host or "*", "core", "anonymous_login") then
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89 if stanza.attr.mechanism ~= "ANONYMOUS" then
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90 return session.send(build_reply("failure", "invalid-mechanism"));
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91 end
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92 elseif stanza.attr.mechanism == "ANONYMOUS" then
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93 return session.send(build_reply("failure", "mechanism-too-weak"));
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94 end
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95 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
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96 if not session.sasl_handler then
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97 return session.send(build_reply("failure", "invalid-mechanism"));
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98 end
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99 elseif not session.sasl_handler then
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100 return; -- FIXME ignoring out of order stanzas because ejabberd does
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101 end
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102 local text = stanza[1];
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103 if text then
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104 text = base64.decode(text);
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105 log("debug", "%s", text);
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106 if not text then
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107 session.sasl_handler = nil;
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108 session.send(build_reply("failure", "incorrect-encoding"));
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109 return;
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110 end
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111 end
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112 local status, ret, err_msg = session.sasl_handler:feed(text);
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113 handle_status(session, status);
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114 local s = build_reply(status, ret, err_msg);
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115 log("debug", "sasl reply: %s", tostring(s));
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116 session.send(s);
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117 end
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118
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119 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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120 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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121 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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122
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123 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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124 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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125 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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126 module:add_event_hook("stream-features",
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Waqas Hussain <waqas20@gmail.com>
parents: 615
diff changeset
127 function (session, features)
1217
844ef764ef0e mod_saslauth: Don't offer bind/session when they aren't authenticated yet :) [thanks albert, again...]
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parents: 1216
diff changeset
128 if not session.username then
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parents: 1216
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129 if secure_auth_only and not session.secure then
844ef764ef0e mod_saslauth: Don't offer bind/session when they aren't authenticated yet :) [thanks albert, again...]
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parents: 1216
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130 return;
844ef764ef0e mod_saslauth: Don't offer bind/session when they aren't authenticated yet :) [thanks albert, again...]
Matthew Wild <mwild1@gmail.com>
parents: 1216
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131 end
705
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parents: 615
diff changeset
132 features:tag("mechanisms", mechanisms_attr);
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133 -- 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.
934
0bda9b5b6a06 Fixed: mod_saslauth: Changed anonymous host option from "sasl_anonymous" to "anonymous_login"
Waqas Hussain <waqas20@gmail.com>
parents: 896
diff changeset
134 if config.get(session.host or "*", "core", "anonymous_login") then
887
eef21d7bbe04 mod_saslauth: Disable SASL ANONYMOUS unless explicitly enabled with sasl_anonymous = true
Matthew Wild <mwild1@gmail.com>
parents: 799
diff changeset
135 features:tag("mechanism"):text("ANONYMOUS"):up();
935
efe3eaaeff34 Fixed: mod_saslauth: "anonymous_login" currently makes SASL ANONYMOUS an exclusive mechanism. Corrected advertised mechanisms and error replies.
Waqas Hussain <waqas20@gmail.com>
parents: 934
diff changeset
136 else
efe3eaaeff34 Fixed: mod_saslauth: "anonymous_login" currently makes SASL ANONYMOUS an exclusive mechanism. Corrected advertised mechanisms and error replies.
Waqas Hussain <waqas20@gmail.com>
parents: 934
diff changeset
137 features:tag("mechanism"):text("DIGEST-MD5"):up();
efe3eaaeff34 Fixed: mod_saslauth: "anonymous_login" currently makes SASL ANONYMOUS an exclusive mechanism. Corrected advertised mechanisms and error replies.
Waqas Hussain <waqas20@gmail.com>
parents: 934
diff changeset
138 features:tag("mechanism"):text("PLAIN"):up();
887
eef21d7bbe04 mod_saslauth: Disable SASL ANONYMOUS unless explicitly enabled with sasl_anonymous = true
Matthew Wild <mwild1@gmail.com>
parents: 799
diff changeset
139 end
705
11afa1d88c55 mod_saslauth, mod_tls: minor code cleanup
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parents: 615
diff changeset
140 features:up();
11afa1d88c55 mod_saslauth, mod_tls: minor code cleanup
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parents: 615
diff changeset
141 else
11afa1d88c55 mod_saslauth, mod_tls: minor code cleanup
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parents: 615
diff changeset
142 features:tag("bind", bind_attr):tag("required"):up():up();
11afa1d88c55 mod_saslauth, mod_tls: minor code cleanup
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parents: 615
diff changeset
143 features:tag("session", xmpp_session_attr):up();
11afa1d88c55 mod_saslauth, mod_tls: minor code cleanup
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parents: 615
diff changeset
144 end
11afa1d88c55 mod_saslauth, mod_tls: minor code cleanup
Waqas Hussain <waqas20@gmail.com>
parents: 615
diff changeset
145 end);
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
146
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
147 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
148 function (session, stanza)
1072
c7967004b5d0 mod_saslauth: Various logging fixes
Matthew Wild <mwild1@gmail.com>
parents: 1071
diff changeset
149 log("debug", "Client requesting a resource bind");
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
150 local resource;
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
151 if stanza.attr.type == "set" then
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
152 local bind = stanza.tags[1];
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
153 if bind and bind.attr.xmlns == xmlns_bind then
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
154 resource = bind:child_with_name("resource");
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
155 if resource then
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
156 resource = resource[1];
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
157 end
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
158 end
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
159 end
304
7b28fa8bbfe5 Code cleanup for resource binding
Waqas Hussain <waqas20@gmail.com>
parents: 297
diff changeset
160 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
46
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parents: 38
diff changeset
161 if not success then
304
7b28fa8bbfe5 Code cleanup for resource binding
Waqas Hussain <waqas20@gmail.com>
parents: 297
diff changeset
162 session.send(st.error_reply(stanza, err_type, err, err_msg));
46
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Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
163 else
304
7b28fa8bbfe5 Code cleanup for resource binding
Waqas Hussain <waqas20@gmail.com>
parents: 297
diff changeset
164 session.send(st.reply(stanza)
7b28fa8bbfe5 Code cleanup for resource binding
Waqas Hussain <waqas20@gmail.com>
parents: 297
diff changeset
165 :tag("bind", { xmlns = xmlns_bind})
7b28fa8bbfe5 Code cleanup for resource binding
Waqas Hussain <waqas20@gmail.com>
parents: 297
diff changeset
166 :tag("jid"):text(session.full_jid));
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
167 end
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
168 end);
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
169
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
170 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
171 function (session, stanza)
1072
c7967004b5d0 mod_saslauth: Various logging fixes
Matthew Wild <mwild1@gmail.com>
parents: 1071
diff changeset
172 log("debug", "Client requesting a session");
313
a273f3a7b8f8 Fixed mod_saslauth to use session.send for sending stanzas
Waqas Hussain <waqas20@gmail.com>
parents: 304
diff changeset
173 session.send(st.reply(stanza));
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
174 end);