Thu, 22 Jan 2009 14:29:29 +0000
util.dependencies: Show useful messages when our own libraries are not found, too
615 | 1 | -- Prosody IM v0.2 |
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2 | -- Copyright (C) 2008 Matthew Wild |
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3 | -- Copyright (C) 2008 Waqas Hussain |
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4 | -- |
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5 | -- This program is free software; you can redistribute it and/or |
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6 | -- modify it under the terms of the GNU General Public License |
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7 | -- as published by the Free Software Foundation; either version 2 |
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8 | -- of the License, or (at your option) any later version. |
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9 | -- |
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10 | -- This program is distributed in the hope that it will be useful, |
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11 | -- but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | -- GNU General Public License for more details. |
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14 | -- |
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15 | -- You should have received a copy of the GNU General Public License |
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16 | -- along with this program; if not, write to the Free Software |
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17 | -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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18 | -- |
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19 | |
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20 | |
38 | 21 | |
22 | local st = require "util.stanza"; | |
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23 | local sm_bind_resource = require "core.sessionmanager".bind_resource; |
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24 | local base64 = require "util.encodings".base64; |
38 | 25 | |
26 | local usermanager_validate_credentials = require "core.usermanager".validate_credentials; | |
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27 | local t_concat, t_insert = table.concat, table.insert; |
38 | 28 | local tostring = tostring; |
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29 | local jid_split = require "util.jid".split |
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30 | local md5 = require "util.hashes".md5; |
38 | 31 | |
32 | local log = require "util.logger".init("mod_saslauth"); | |
33 | ||
34 | local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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35 | local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
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36 | local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; |
38 | 37 | |
38 | local new_sasl = require "util.sasl".new; | |
39 | ||
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40 | local function build_reply(status, ret, err_msg) |
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41 | local reply = st.stanza(status, {xmlns = xmlns_sasl}); |
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42 | if status == "challenge" then |
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43 | log("debug", ret or ""); |
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44 | reply:text(base64.encode(ret or "")); |
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45 | elseif status == "failure" then |
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46 | reply:tag(ret):up(); |
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47 | if err_msg then reply:tag("text"):text(err_msg); end |
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48 | elseif status == "success" then |
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49 | log("debug", ret or ""); |
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50 | reply:text(base64.encode(ret or "")); |
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51 | else |
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52 | error("Unknown sasl status: "..status); |
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53 | end |
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54 | return reply; |
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55 | end |
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56 | |
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57 | local function handle_status(session, status) |
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58 | if status == "failure" then |
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59 | session.sasl_handler = nil; |
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60 | elseif status == "success" then |
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61 | 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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62 | sessionmanager.make_authenticated(session, session.sasl_handler.username); |
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63 | session.sasl_handler = nil; |
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64 | session:reset_stream(); |
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65 | end |
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66 | end |
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67 | |
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68 | local function password_callback(node, host, mechanism, decoder) |
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69 | local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords |
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70 | local func = function(x) return x; end; |
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71 | if password then |
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72 | if mechanism == "PLAIN" then |
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73 | return func, password; |
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74 | elseif mechanism == "DIGEST-MD5" then |
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75 | if decoder then node, host, password = decoder(node), decoder(host), decoder(password); end |
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76 | return func, md5(node..":"..host..":"..password); |
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77 | end |
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78 | end |
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79 | return func, nil; |
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80 | end |
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81 | |
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82 | local function sasl_handler(session, stanza) |
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83 | if stanza.name == "auth" then |
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84 | -- FIXME ignoring duplicates because ejabberd does |
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85 | session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback); |
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86 | elseif not session.sasl_handler then |
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87 | return; -- FIXME ignoring out of order stanzas because ejabberd does |
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88 | end |
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89 | local text = stanza[1]; |
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90 | if text then |
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91 | text = base64.decode(text); |
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92 | log("debug", text); |
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93 | if not text then |
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94 | session.sasl_handler = nil; |
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95 | session.send(build_reply("failure", "incorrect-encoding")); |
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96 | return; |
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97 | end |
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98 | end |
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99 | local status, ret, err_msg = session.sasl_handler:feed(text); |
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100 | handle_status(session, status); |
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101 | local s = build_reply(status, ret, err_msg); |
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102 | log("debug", "sasl reply: "..tostring(s)); |
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103 | session.send(s); |
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104 | end |
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105 | |
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106 | module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler); |
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107 | module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler); |
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108 | module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler); |
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109 | |
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110 | local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
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111 | local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
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112 | local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
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113 | module:add_event_hook("stream-features", |
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114 | function (session, features) |
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115 | if not session.username then |
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116 | features:tag("mechanisms", mechanisms_attr); |
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117 | -- 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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118 | features:tag("mechanism"):text("PLAIN"):up(); |
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119 | features:tag("mechanism"):text("DIGEST-MD5"):up(); |
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120 | features:up(); |
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121 | else |
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122 | features:tag("bind", bind_attr):tag("required"):up():up(); |
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123 | features:tag("session", xmpp_session_attr):up(); |
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124 | end |
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125 | end); |
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126 | |
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127 | module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", |
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128 | function (session, stanza) |
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129 | log("debug", "Client tried to bind to a resource"); |
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130 | local resource; |
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131 | if stanza.attr.type == "set" then |
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132 | local bind = stanza.tags[1]; |
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133 | if bind and bind.attr.xmlns == xmlns_bind then |
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134 | resource = bind:child_with_name("resource"); |
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135 | if resource then |
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136 | resource = resource[1]; |
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137 | end |
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138 | end |
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139 | end |
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140 | local success, err_type, err, err_msg = sm_bind_resource(session, resource); |
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141 | if not success then |
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142 | session.send(st.error_reply(stanza, err_type, err, err_msg)); |
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143 | else |
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144 | session.send(st.reply(stanza) |
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145 | :tag("bind", { xmlns = xmlns_bind}) |
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146 | :tag("jid"):text(session.full_jid)); |
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147 | end |
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148 | end); |
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149 | |
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150 | module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", |
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151 | function (session, stanza) |
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152 | log("debug", "Client tried to bind to a resource"); |
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153 | session.send(st.reply(stanza)); |
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154 | end); |