prosody
064efb684aff
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 2646:064efb684aff

mod_saslauth: Correct syntax for gracefully handling a missing cyrussasl library
author Matthew Wild <mwild1@gmail.com>
date Mon, 15 Feb 2010 22:56:15 +0000
parent 2642:333d7e2033b2
child 2647:0ddb3c4dc9d1
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rev   line source
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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
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16 local nodeprep = require "util.encodings".stringprep.nodeprep;
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17 local datamanager_load = require "util.datamanager".load;
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18 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
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19 local usermanager_get_supported_methods = require "core.usermanager".get_supported_methods;
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20 local usermanager_user_exists = require "core.usermanager".user_exists;
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21 local usermanager_get_password = require "core.usermanager".get_password;
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22 local t_concat, t_insert = table.concat, table.insert;
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23 local tostring = tostring;
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24 local jid_split = require "util.jid".split;
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25 local md5 = require "util.hashes".md5;
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26 local config = require "core.configmanager";
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28 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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29 local sasl_backend = module:get_option("sasl_backend") or "builtin";
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31 local log = module._log;
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32
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33 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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34 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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35 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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37 local new_sasl;
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38 if sasl_backend == "cyrus" then
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39 local ok, cyrus = pcall(require, "util.sasl_cyrus");
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40 if ok then
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41 local cyrus_new = cyrus.new;
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42 new_sasl = function(realm)
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43 return cyrus_new(realm, module:get_option("cyrus_service_name") or "xmpp");
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44 end
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45 else
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46 sasl_backend = "builtin";
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47 module:log("warn", "Failed to load Cyrus SASL, falling back to builtin auth mechanisms");
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48 end
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49 end
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50 if not new_sasl then
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51 if sasl_backend ~= "builtin" then module:log("warn", "Unknown SASL backend %s", sasl_backend); end;
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52 new_sasl = require "util.sasl".new;
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53 end
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54
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55 local default_authentication_profile = {
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56 plain = function(username, realm)
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57 local prepped_username = nodeprep(username);
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58 if not prepped_username then
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59 log("debug", "NODEprep failed on username: %s", username);
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60 return "", nil;
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61 end
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62 local password = usermanager_get_password(prepped_username, realm);
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63 if not password then
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64 return "", nil;
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65 end
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66 return password, true;
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67 end
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68 };
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69
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70 local anonymous_authentication_profile = {
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71 anonymous = function(username, realm)
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72 return true; -- for normal usage you should always return true here
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73 end
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74 };
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75
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76 local function build_reply(status, ret, err_msg)
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77 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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78 if status == "challenge" then
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79 --log("debug", "CHALLENGE: %s", ret or "");
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80 reply:text(base64.encode(ret or ""));
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81 elseif status == "failure" then
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82 reply:tag(ret):up();
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83 if err_msg then reply:tag("text"):text(err_msg); end
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84 elseif status == "success" then
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85 --log("debug", "SUCCESS: %s", ret or "");
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86 reply:text(base64.encode(ret or ""));
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87 else
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88 module:log("error", "Unknown sasl status: %s", status);
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89 end
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90 return reply;
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91 end
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92
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93 local function handle_status(session, status)
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94 if status == "failure" then
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95 session.sasl_handler = session.sasl_handler:clean_clone();
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96 elseif status == "success" then
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97 local username = nodeprep(session.sasl_handler.username);
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98 if not username then -- TODO move this to sessionmanager
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99 module:log("warn", "SASL succeeded but we didn't get a username!");
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100 session.sasl_handler = nil;
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101 session:reset_stream();
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102 return;
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103 end
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104 sm_make_authenticated(session, session.sasl_handler.username);
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105 session.sasl_handler = nil;
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106 session:reset_stream();
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107 end
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108 end
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109
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110 local function sasl_handler(session, stanza)
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111 if stanza.name == "auth" then
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112 -- FIXME ignoring duplicates because ejabberd does
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113 if config.get(session.host or "*", "core", "anonymous_login") then
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114 if stanza.attr.mechanism ~= "ANONYMOUS" then
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115 return session.send(build_reply("failure", "invalid-mechanism"));
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116 end
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117 elseif stanza.attr.mechanism == "ANONYMOUS" then
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118 return session.send(build_reply("failure", "mechanism-too-weak"));
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119 end
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120 local valid_mechanism = session.sasl_handler:select(stanza.attr.mechanism);
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121 if not valid_mechanism then
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122 return session.send(build_reply("failure", "invalid-mechanism"));
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123 end
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124 if secure_auth_only and not session.secure then
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parents: 2251
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125 return session.send(build_reply("failure", "encryption-required"));
4768879d3591 mod_saslauth: Requiring c2s encryption means requiring c2s encryption... thanks Flo
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parents: 2251
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126 end
295
bb078eb1f1de mod_saslauth: Code cleanup
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127 elseif not session.sasl_handler then
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128 return; -- FIXME ignoring out of order stanzas because ejabberd does
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129 end
284
4f540755260c mod_saslauth: Added base64 decoding, encoding check, and cleaned the code up.
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130 local text = stanza[1];
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131 if text then
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132 text = base64.decode(text);
2634
e486aca8c5d1 mod_saslauth: Don't print raw SASL data to avoid logging passwords unnecessarily
Matthew Wild <mwild1@gmail.com>
parents: 2612
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133 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
284
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134 if not text then
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135 session.sasl_handler = nil;
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136 session.send(build_reply("failure", "incorrect-encoding"));
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137 return;
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parents: 281
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138 end
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139 end
2179
c985536d5452 Making mod_saslauth use the new SASL API.
Tobias Markmann <tm@ayena.de>
parents: 1639
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140 local status, ret, err_msg = session.sasl_handler:process(text);
284
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parents: 281
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141 handle_status(session, status);
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ffe8a9296e04 mod_saslauth, usermanager: Fetch list of mechanisms from usermanager
Nick Thomas
parents: 1523
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142 local s = build_reply(status, ret, err_msg);
1072
c7967004b5d0 mod_saslauth: Various logging fixes
Matthew Wild <mwild1@gmail.com>
parents: 1071
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143 log("debug", "sasl reply: %s", tostring(s));
288
dc53343af9ac Set username in a SASL object.
Tobias Markmann <tm@ayena.de>
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144 session.send(s);
284
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145 end
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parents: 281
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_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.
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parents: 357
diff changeset
148 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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parents: 357
diff changeset
149 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
284
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parents: 281
diff changeset
150
357
17bcecb06420 Use a stanza for c2s stream features instead of an array of strings. Removes a FIXME.
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parents: 313
diff changeset
151 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.
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parents: 313
diff changeset
152 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.
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parents: 313
diff changeset
153 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
2612
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parents: 2451
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154 module:hook("stream-features", function(event)
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155 local origin, features = event.origin, event.features;
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156 if not origin.username then
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parents: 2451
diff changeset
157 if secure_auth_only and not origin.secure then
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diff changeset
158 return;
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parents: 2450
diff changeset
159 end
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
160 if module:get_option("anonymous_login") then
2612
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Waqas Hussain <waqas20@gmail.com>
parents: 2451
diff changeset
161 origin.sasl_handler = new_sasl(origin.host, anonymous_authentication_profile);
2451
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parents: 2450
diff changeset
162 else
2612
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Waqas Hussain <waqas20@gmail.com>
parents: 2451
diff changeset
163 origin.sasl_handler = new_sasl(origin.host, default_authentication_profile);
475552b04151 mod_saslauth: Hook stream-features event using new events API.
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parents: 2451
diff changeset
164 if not (module:get_option("allow_unencrypted_plain_auth")) and not origin.secure then
475552b04151 mod_saslauth: Hook stream-features event using new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2451
diff changeset
165 origin.sasl_handler:forbidden({"PLAIN"});
705
11afa1d88c55 mod_saslauth, mod_tls: minor code cleanup
Waqas Hussain <waqas20@gmail.com>
parents: 615
diff changeset
166 end
2451
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parents: 2450
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167 end
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
168 features:tag("mechanisms", mechanisms_attr);
2612
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parents: 2451
diff changeset
169 for k, v in pairs(origin.sasl_handler:mechanisms()) do
2451
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parents: 2450
diff changeset
170 features:tag("mechanism"):text(v):up();
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parents: 2450
diff changeset
171 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
172 features:up();
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
173 else
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
174 features:tag("bind", bind_attr):tag("required"):up():up();
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parents: 2450
diff changeset
175 features:tag("session", xmpp_session_attr):tag("optional"):up():up();
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parents: 2450
diff changeset
176 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
177 end);
1584
ffe8a9296e04 mod_saslauth, usermanager: Fetch list of mechanisms from usermanager
Nick Thomas
parents: 1523
diff changeset
178
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parents: 2450
diff changeset
179 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", function(session, stanza)
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parents: 2450
diff changeset
180 log("debug", "Client requesting a resource bind");
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parents: 2450
diff changeset
181 local resource;
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
182 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
183 local bind = stanza.tags[1];
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
184 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
185 resource = bind:child_with_name("resource");
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
186 if resource then
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
187 resource = resource[1];
46
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
Matthew Wild <mwild1@gmail.com>
parents: 38
diff changeset
188 end
2451
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parents: 2450
diff changeset
189 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
190 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
191 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
192 if not success then
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
193 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
194 else
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
195 session.send(st.reply(stanza)
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
196 :tag("bind", { xmlns = xmlns_bind})
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Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
197 :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
198 end
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
199 end);
1584
ffe8a9296e04 mod_saslauth, usermanager: Fetch list of mechanisms from usermanager
Nick Thomas
parents: 1523
diff changeset
200
2451
d2f747920eaf mod_saslauth: Fixed some indentation and added some semi-colons.
Waqas Hussain <waqas20@gmail.com>
parents: 2450
diff changeset
201 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
202 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
203 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
204 end);