prosody
33175ad2f682
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 292:33175ad2f682

Started using realm in password hashing, and added support for error message replies from sasl
author Waqas Hussain <waqas20@gmail.com>
date Sun, 16 Nov 2008 01:54:14 +0500
parent 291:5672d2be1bf3
child 293:b446de4e258e
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1
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2 local st = require "util.stanza";
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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
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7 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
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8 local t_concat, t_insert = table.concat, table.insert;
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9 local tostring = tostring;
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10 local jid_split = require "util.jid".split
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11
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12 local log = require "util.logger".init("mod_saslauth");
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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';
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18 local new_sasl = require "util.sasl".new;
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19
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20 local function build_reply(status, ret, err_msg)
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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 if err_msg then reply:tag("text"); end
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27 elseif status == "success" then
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28 reply:text(ret or "");
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29 else
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30 error("Unknown sasl status: "..status);
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31 end
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32 return reply;
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33 end
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34
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35 local function handle_status(session, status)
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36 if status == "failure" then
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37 session.sasl_handler = nil;
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38 elseif status == "success" then
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39 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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40 sessionmanager.make_authenticated(session, session.sasl_handler.username);
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41 session.sasl_handler = nil;
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42 session:reset_stream();
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43 end
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44 end
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45
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46 local function password_callback(node, host, mechanism)
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47 local password = (datamanager.load(node, host, "accounts") or {}).password; -- FIXME handle hashed passwords
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48 local func = function(x) return x; end;
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49 if password then
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50 if mechanism == "PLAIN" then
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51 return func, password;
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52 elseif mechanism == "DIGEST-MD5" then
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53 return func, require "hashes".md5(node..":"..host..":"..password);
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54 end
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55 end
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56 return func, nil;
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57 end
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58
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59 function do_sasl(session, stanza)
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60 local text = stanza[1];
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61 if text then
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62 text = base64.decode(text);
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63 if not text then
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64 session.sasl_handler = nil;
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65 session.send(build_reply("failure", "incorrect-encoding"));
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66 return;
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67 end
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68 end
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69 local status, ret, err_msg = session.sasl_handler:feed(text);
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70 handle_status(session, status);
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71 local s = build_reply(status, ret, err_msg);
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72 log("debug", "sasl reply: "..tostring(s));
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73 session.send(s);
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74 end
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75
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76 add_handler("c2s_unauthed", "auth", xmlns_sasl,
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77 function (session, stanza)
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78 if not session.sasl_handler then
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79 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, password_callback);
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80 do_sasl(session, stanza);
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81 else
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82 error("Client tried to negotiate SASL again", 0);
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83 end
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84 end);
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85
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86 add_handler("c2s_unauthed", "abort", xmlns_sasl,
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87 function(session, stanza)
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88 if not session.sasl_handler then error("Attempt to abort when sasl has not started"); end
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89 do_sasl(session, stanza);
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90 end);
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91
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92 add_handler("c2s_unauthed", "response", xmlns_sasl,
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93 function(session, stanza)
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94 if not session.sasl_handler then error("Attempt to respond when sasl has not started"); end
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95 do_sasl(session, stanza);
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96 end);
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97
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98 add_event_hook("stream-features",
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99 function (session, features)
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100 if not session.username then
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101 t_insert(features, "<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>");
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102 -- 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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103 t_insert(features, "<mechanism>PLAIN</mechanism>");
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104 -- t_insert(features, "<mechanism>DIGEST-MD5</mechanism>");
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105 t_insert(features, "</mechanisms>");
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106 else
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107 t_insert(features, "<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><required/></bind>");
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108 t_insert(features, "<session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>");
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109 end
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110 --send [[<register xmlns="http://jabber.org/features/iq-register"/> ]]
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111 end);
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112
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113 add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
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114 function (session, stanza)
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115 log("debug", "Client tried to bind to a resource");
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116 local resource;
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117 if stanza.attr.type == "set" then
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118 local bind = stanza.tags[1];
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119
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120 if bind and bind.attr.xmlns == xmlns_bind then
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121 resource = bind:child_with_name("resource");
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122 if resource then
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123 resource = resource[1];
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124 end
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125 end
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126 end
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127 local success, err = sm_bind_resource(session, resource);
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128 if not success then
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129 local reply = st.reply(stanza);
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130 reply.attr.type = "error";
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131 if err == "conflict" then
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132 reply:tag("error", { type = "modify" })
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133 :tag("conflict", { xmlns = xmlns_stanzas });
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134 elseif err == "constraint" then
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135 reply:tag("error", { type = "cancel" })
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136 :tag("resource-constraint", { xmlns = xmlns_stanzas });
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137 elseif err == "auth" then
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138 reply:tag("error", { type = "cancel" })
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139 :tag("not-allowed", { xmlns = xmlns_stanzas });
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140 end
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141 send(session, reply);
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142 else
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143 local reply = st.reply(stanza);
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144 reply:tag("bind", { xmlns = xmlns_bind})
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145 :tag("jid"):text(session.full_jid);
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146 send(session, reply);
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147 end
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148 end);
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149
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150 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 send(session, st.reply(stanza));
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154 end);