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annotate mod_sasl2/mod_sasl2.lua @ 5038:88980b2dd986

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mod_sasl2: Hacky support for channel binding We should work out how to share this code properly between here and mod_saslauth.
author Matthew Wild <mwild1@gmail.com>
date Tue, 06 Sep 2022 16:01:12 +0100
parents 1f2d2bfd29dd
children c0d243b27e64
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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 local set = require "util.set";
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15
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16 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
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17 local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
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18
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19 local xmlns_sasl2 = "urn:xmpp:sasl:1";
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20
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21 local allow_unencrypted_plain_auth = module:get_option_boolean("allow_unencrypted_plain_auth", false)
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22 local insecure_mechanisms = module:get_option_set("insecure_sasl_mechanisms", allow_unencrypted_plain_auth and {} or {"PLAIN", "LOGIN"});
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23 local disabled_mechanisms = module:get_option_set("disable_sasl_mechanisms", { "DIGEST-MD5" });
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24
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25 local host = module.host;
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26
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27 local function tls_unique(self)
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28 return self.userdata["tls-unique"]:ssl_peerfinished();
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29 end
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30
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31 local function tls_exporter(conn)
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32 if not conn.ssl_exportkeyingmaterial then return end
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33 return conn:ssl_exportkeyingmaterial("EXPORTER-Channel-Binding", 32, "");
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34 end
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35
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36 local function sasl_tls_exporter(self)
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37 return tls_exporter(self.userdata["tls-exporter"]);
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38 end
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39
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40 module:hook("stream-features", function(event)
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41 local origin, features = event.origin, event.features;
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42 local log = origin.log or module._log;
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43
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44 if origin.type ~= "c2s_unauthed" then
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45 log("debug", "Already authenticated");
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46 return
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47 end
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48
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49 local sasl_handler = usermanager_get_sasl_handler(host, origin)
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50 origin.sasl_handler = sasl_handler;
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51
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52 local channel_bindings = set.new()
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53 if origin.encrypted then
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54 -- check whether LuaSec has the nifty binding to the function needed for tls-unique
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55 -- FIXME: would be nice to have this check only once and not for every socket
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56 if sasl_handler.add_cb_handler then
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57 local info = origin.conn:ssl_info();
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58 if info and info.protocol == "TLSv1.3" then
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59 log("debug", "Channel binding 'tls-unique' undefined in context of TLS 1.3");
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60 if tls_exporter(origin.conn) then
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61 log("debug", "Channel binding 'tls-exporter' supported");
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62 sasl_handler:add_cb_handler("tls-exporter", sasl_tls_exporter);
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63 channel_bindings:add("tls-exporter");
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64 end
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65 elseif origin.conn.ssl_peerfinished and origin.conn:ssl_peerfinished() then
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66 log("debug", "Channel binding 'tls-unique' supported");
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67 sasl_handler:add_cb_handler("tls-unique", tls_unique);
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68 channel_bindings:add("tls-unique");
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69 else
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70 log("debug", "Channel binding 'tls-unique' not supported (by LuaSec?)");
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71 end
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72 sasl_handler["userdata"] = {
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73 ["tls-unique"] = origin.conn;
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74 ["tls-exporter"] = origin.conn;
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75 };
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76 else
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77 log("debug", "Channel binding not supported by SASL handler");
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78 end
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79 end
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80
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81 local mechanisms = st.stanza("mechanisms", { xmlns = xmlns_sasl2 });
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82
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83 local available_mechanisms = sasl_handler:mechanisms()
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84 for mechanism in pairs(available_mechanisms) do
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85 if disabled_mechanisms:contains(mechanism) then
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86 log("debug", "Not offering disabled mechanism %s", mechanism);
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87 elseif not origin.secure and insecure_mechanisms:contains(mechanism) then
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88 log("debug", "Not offering mechanism %s on insecure connection", mechanism);
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89 else
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90 log("debug", "Offering mechanism %s", mechanism);
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91 mechanisms:text_tag("mechanism", mechanism);
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92 end
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93 end
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94
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95 features:add_direct_child(mechanisms);
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96
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97 local inline = st.stanza("inline", { xmlns = xmlns_sasl2 });
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98 module:fire_event("advertise-sasl-features", { session = origin, features = inline });
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99 features:add_direct_child(inline);
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100 end, 1);
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101
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102 local function handle_status(session, status, ret, err_msg)
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103 local err = nil;
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104 if status == "error" then
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105 ret, err = nil, ret;
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106 if not errors.is_err(err) then
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107 err = errors.new({ condition = err, text = err_msg }, { session = session });
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108 end
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109 end
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110
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111 return module:fire_event("sasl2/"..session.base_type.."/"..status, {
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112 session = session,
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113 message = ret;
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114 error = err;
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115 error_text = err_msg;
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116 });
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117 end
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118
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119 module:hook("sasl2/c2s/failure", function (event)
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120 local session, condition, text = event.session, event.message, event.error_text;
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121 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 })
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122 :tag(condition):up();
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123 if text then
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124 failure:text_tag("text", text);
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125 end
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126 session.send(failure);
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127 return true;
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128 end);
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129
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130 module:hook("sasl2/c2s/error", function (event)
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131 local session = event.session
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132 session.send(st.stanza("failure", { xmlns = xmlns_sasl2 })
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133 :tag(event.error and event.error.condition));
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134 return true;
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135 end);
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136
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137 module:hook("sasl2/c2s/challenge", function (event)
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138 local session = event.session;
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139 session.send(st.stanza("challenge", { xmlns = xmlns_sasl2 })
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140 :text(base64.encode(event.message)));
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141 return true;
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142 end);
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143
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144 module:hook("sasl2/c2s/success", function (event)
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145 local session = event.session
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146 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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147 if not ok then
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148 handle_status(session, "failure", err);
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149 return true;
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150 end
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151 event.success = st.stanza("success", { xmlns = xmlns_sasl2 });
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152 if event.message then
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153 event.success:text_tag("additional-data", base64.encode(event.message));
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154 end
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155 end, 1000);
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156
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157 module:hook("sasl2/c2s/success", function (event)
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158 local session = event.session
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159 event.success:text_tag("authorization-identifier", jid_join(session.username, session.host, session.resource));
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160 session.send(event.success);
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161 local features = st.stanza("stream:features");
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162 module:fire_event("stream-features", { origin = session, features = features });
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163 session.send(features);
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164 end, -1000);
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165
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166 -- The gap here is to allow modules to do stuff to the stream after the stanza
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167 -- is sent, but before we proceed with anything else. This is expected to be
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168 -- a common pattern with SASL2, which allows atomic negotiation of a bunch of
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169 -- stream features.
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170 module:hook("sasl2/c2s/success", function (event) --luacheck: ignore 212/event
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171 return true;
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172 end, -2000);
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173
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174 local function process_cdata(session, cdata)
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175 if cdata then
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176 cdata = base64.decode(cdata);
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177 if not cdata then
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178 return handle_status(session, "failure", "incorrect-encoding");
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179 end
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180 end
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181 return handle_status(session, session.sasl_handler:process(cdata));
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182 end
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183
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184 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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185 local sasl_handler = session.sasl_handler;
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186 if not sasl_handler then
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187 sasl_handler = usermanager_get_sasl_handler(host, session);
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188 session.sasl_handler = sasl_handler;
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189 end
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190 local mechanism = assert(auth.attr.mechanism);
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191 if not sasl_handler:select(mechanism) then
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192 return handle_status(session, "failure", "invalid-mechanism");
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193 end
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194 local initial = auth:get_child_text("initial-response");
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195 return process_cdata(session, initial);
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196 end);
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197
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198 module:hook_tag(xmlns_sasl2, "response", function (session, response)
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199 local sasl_handler = session.sasl_handler;
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200 if not sasl_handler or not sasl_handler.selected then
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201 return handle_status(session, "failure", "invalid-mechanism");
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202 end
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203 return process_cdata(session, response:get_text());
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204 end);