prosody-modules
5ae2e865eea0
mod_sasl2/mod_sasl2.lua

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mod_sasl2/mod_sasl2.lua @ 3905:5ae2e865eea0

mod_sasl2: Experimental implementation of XEP-0388
author Kim Alvefur <zash@zash.se>
date Sat, 28 Sep 2019 00:16:13 +0200
child 4792:9d57aa79c5d9
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3905
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
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1 -- Prosody IM
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2 -- Copyright (C) 2019 Kim Alvefur
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7 -- XEP-0388: Extensible SASL Profile
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8 --
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9
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10 local st = require "util.stanza";
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11 local errors = require "util.error";
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12 local base64 = require "util.encodings".base64;
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13 local jid_join = require "util.jid".join;
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14
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15 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
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16 local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
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17
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18 local xmlns_sasl2 = "urn:xmpp:sasl:1";
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19
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20 local allow_unencrypted_plain_auth = module:get_option_boolean("allow_unencrypted_plain_auth", false)
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21 local insecure_mechanisms = module:get_option_set("insecure_sasl_mechanisms", allow_unencrypted_plain_auth and {} or {"PLAIN", "LOGIN"});
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22 local disabled_mechanisms = module:get_option_set("disable_sasl_mechanisms", { "DIGEST-MD5" });
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23
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24 local host = module.host;
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25
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26 local function tls_unique(self)
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27 return self.userdata["tls-unique"]:getpeerfinished();
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28 end
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29
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30 module:hook("stream-features", function(event)
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31 local origin, features = event.origin, event.features;
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32 local log = origin.log or module._log;
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33
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34 if origin.type ~= "c2s_unauthed" then
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35 log("debug", "Already authenticated");
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36 return
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37 end
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38
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39 local sasl_handler = usermanager_get_sasl_handler(host, origin)
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40 origin.sasl_handler = sasl_handler;
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41
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42 if sasl_handler.add_cb_handler then
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43 local socket = origin.conn:socket();
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44 if socket.getpeerfinished then
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45 sasl_handler:add_cb_handler("tls-unique", tls_unique);
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46 end
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47 sasl_handler["userdata"] = {
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48 ["tls-unique"] = socket;
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49 };
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50 end
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51
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52 local mechanisms = st.stanza("mechanisms", { xmlns = xmlns_sasl2 });
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53
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54 local available_mechanisms = sasl_handler:mechanisms()
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55 for mechanism in pairs(available_mechanisms) do
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56 if disabled_mechanisms:contains(mechanism) then
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57 log("debug", "Not offering disabled mechanism %s", mechanism);
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58 elseif not origin.secure and insecure_mechanisms:contains(mechanism) then
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59 log("debug", "Not offering mechanism %s on insecure connection", mechanism);
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60 else
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61 log("debug", "Offering mechanism %s", mechanism);
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62 mechanisms:text_tag("mechanism", mechanism);
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63 end
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64 end
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65
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66 features:add_direct_child(mechanisms);
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67 end, 1);
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68
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69 local function handle_status(session, status, ret, err_msg)
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70 local err = nil;
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71 if status == "error" then
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72 ret, err = nil, ret;
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73 if not errors.is_err(err) then
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74 err = errors.new({ condition = err, text = err_msg }, { session = session });
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75 end
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76 end
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77
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78 module:fire_event("sasl2/"..session.base_type.."/"..status, {
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79 session = session,
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80 message = ret;
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81 error = err;
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82 });
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83 end
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84
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85 module:hook("sasl2/c2s/failure", function (event)
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86 local session = event.session
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87 session.send(st.stanza("failure", { xmlns = xmlns_sasl2 })
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88 :tag(event.error.condition));
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89 return true;
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90 end);
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91
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92 module:hook("sasl2/c2s/challenge", function (event)
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93 local session = event.session;
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94 session.send(st.stanza("challenge", { xmlns = xmlns_sasl2 })
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95 :text_tag(event.message));
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96 end);
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97
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98 module:hook("sasl2/c2s/success", function (event)
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99 local session = event.session
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100 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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101 if not ok then
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102 handle_status(session, "failure", err);
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103 return true;
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104 end
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105 event.success = st.stanza("success", { xmlns = xmlns_sasl2 });
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106 end, 1000);
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107
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108 module:hook("sasl2/c2s/success", function (event)
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109 local session = event.session
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110 event.success:text_tag("authorization-identifier", jid_join(session.username, session.host, session.resource));
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111 session.send(event.success);
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112 local features = st.stanza("stream:features");
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113 module:fire_event("stream-features", { origin = session, features = features });
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114 session.send(features);
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115 end, -1000);
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116
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117 local function process_cdata(session, cdata)
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118 if cdata then
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119 cdata = base64.decode(cdata);
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120 if not cdata then
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121 return handle_status(session, "failure");
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122 end
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123 end
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124 return handle_status(session, session.sasl_handler:process(cdata));
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125 end
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126
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127 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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128 local sasl_handler = session.sasl_handler;
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129 if not sasl_handler then
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130 sasl_handler = usermanager_get_sasl_handler(host, session);
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131 session.sasl_handler = sasl_handler;
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132 end
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133 local mechanism = assert(auth.attr.mechanism);
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134 if not sasl_handler:select(mechanism) then
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135 return handle_status(session, "failure");
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136 end
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137 local initial = auth:get_child_text("initial-response");
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138 return process_cdata(session, initial);
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139 end);
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140
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141 module:hook_tag(xmlns_sasl2, "response", function (session, response)
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142 local sasl_handler = session.sasl_handler;
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143 if not sasl_handler or not sasl_handler.selected then
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144 return handle_status(session, "failure");
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145 end
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146 return process_cdata(session, response:get_text());
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147 end);