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annotate mod_sasl2/mod_sasl2.lua @ 5171:1682166171ff

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author Stephen Paul Weber <singpolyma@singpolyma.net>
date Mon, 20 Feb 2023 13:41:46 -0500
parents e9cf361982d5
children 828e5e443613
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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 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:2";
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20
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21 local secure_auth_only = module:get_option_boolean("c2s_require_encryption", module:get_option_boolean("require_encryption", true));
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22 local allow_unencrypted_plain_auth = module:get_option_boolean("allow_unencrypted_plain_auth", false)
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23 local insecure_mechanisms = module:get_option_set("insecure_sasl_mechanisms", allow_unencrypted_plain_auth and {} or {"PLAIN", "LOGIN"});
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24 local disabled_mechanisms = module:get_option_set("disable_sasl_mechanisms", { "DIGEST-MD5" });
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25
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26 local host = module.host;
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27
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28 local function tls_unique(self)
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29 return self.userdata["tls-unique"]:ssl_peerfinished();
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30 end
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31
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32 local function tls_exporter(conn)
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33 if not conn.ssl_exportkeyingmaterial then return end
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34 return conn:ssl_exportkeyingmaterial("EXPORTER-Channel-Binding", 32, "");
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35 end
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36
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37 local function sasl_tls_exporter(self)
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38 return tls_exporter(self.userdata["tls-exporter"]);
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39 end
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40
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41 module:hook("stream-features", function(event)
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42 local origin, features = event.origin, event.features;
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43 local log = origin.log or module._log;
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44
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45 if origin.type ~= "c2s_unauthed" then
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46 log("debug", "Already authenticated");
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47 return
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48 elseif secure_auth_only and not origin.secure then
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49 log("debug", "Not offering authentication on insecure connection");
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50 return;
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51 end
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52
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53 local sasl_handler = usermanager_get_sasl_handler(host, origin)
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54 origin.sasl_handler = sasl_handler;
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55
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56 local channel_bindings = set.new()
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57 if origin.encrypted then
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58 -- check whether LuaSec has the nifty binding to the function needed for tls-unique
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59 -- FIXME: would be nice to have this check only once and not for every socket
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60 if sasl_handler.add_cb_handler then
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61 local info = origin.conn:ssl_info();
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62 if info and info.protocol == "TLSv1.3" then
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63 log("debug", "Channel binding 'tls-unique' undefined in context of TLS 1.3");
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64 if tls_exporter(origin.conn) then
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65 log("debug", "Channel binding 'tls-exporter' supported");
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66 sasl_handler:add_cb_handler("tls-exporter", sasl_tls_exporter);
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67 channel_bindings:add("tls-exporter");
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68 end
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69 elseif origin.conn.ssl_peerfinished and origin.conn:ssl_peerfinished() then
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70 log("debug", "Channel binding 'tls-unique' supported");
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71 sasl_handler:add_cb_handler("tls-unique", tls_unique);
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72 channel_bindings:add("tls-unique");
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73 else
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74 log("debug", "Channel binding 'tls-unique' not supported (by LuaSec?)");
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75 end
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76 sasl_handler["userdata"] = {
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77 ["tls-unique"] = origin.conn;
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78 ["tls-exporter"] = origin.conn;
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79 };
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80 else
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81 log("debug", "Channel binding not supported by SASL handler");
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82 end
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83 end
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84
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85 local mechanisms = st.stanza("authentication", { xmlns = xmlns_sasl2 });
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86
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87 local available_mechanisms = sasl_handler:mechanisms()
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88 for mechanism in pairs(available_mechanisms) do
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89 if disabled_mechanisms:contains(mechanism) then
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90 log("debug", "Not offering disabled mechanism %s", mechanism);
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91 elseif not origin.secure and insecure_mechanisms:contains(mechanism) then
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92 log("debug", "Not offering mechanism %s on insecure connection", mechanism);
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93 else
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94 log("debug", "Offering mechanism %s", mechanism);
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95 mechanisms:text_tag("mechanism", mechanism);
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96 end
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97 end
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98
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99 features:add_direct_child(mechanisms);
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100
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101 local inline = st.stanza("inline");
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102 module:fire_event("advertise-sasl-features", { origin = origin, features = inline, stream = event.stream });
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103 mechanisms:add_direct_child(inline);
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104 end, 1);
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105
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106 local function handle_status(session, status, ret, err_msg)
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107 local err = nil;
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108 if status == "error" then
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109 ret, err = nil, ret;
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110 if not errors.is_err(err) then
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111 err = errors.new({ condition = err, text = err_msg }, { session = session });
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112 end
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113 end
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114
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115 return module:fire_event("sasl2/"..session.base_type.."/"..status, {
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116 session = session,
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117 message = ret;
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118 error = err;
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119 error_text = err_msg;
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120 });
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121 end
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122
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123 module:hook("sasl2/c2s/failure", function (event)
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124 local session, condition, text = event.session, event.message, event.error_text;
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125 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 })
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126 :tag(condition, { xmlns = "urn:ietf:params:xml:ns:xmpp-sasl" }):up();
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127 if text then
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128 failure:text_tag("text", text);
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129 end
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130 session.send(failure);
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131 return true;
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132 end);
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133
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134 module:hook("sasl2/c2s/error", function (event)
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135 local session = event.session
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136 session.send(st.stanza("failure", { xmlns = xmlns_sasl2 })
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137 :tag(event.error and event.error.condition));
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138 return true;
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139 end);
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140
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141 module:hook("sasl2/c2s/challenge", function (event)
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142 local session = event.session;
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143 session.send(st.stanza("challenge", { xmlns = xmlns_sasl2 })
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144 :text(base64.encode(event.message)));
5020
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145 return true;
3905
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146 end);
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147
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148 module:hook("sasl2/c2s/success", function (event)
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149 local session = event.session
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150 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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151 if not ok then
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152 handle_status(session, "failure", err);
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153 return true;
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154 end
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155 event.success = st.stanza("success", { xmlns = xmlns_sasl2 });
5023
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156 if event.message then
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157 event.success:text_tag("additional-data", base64.encode(event.message));
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158 end
3905
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159 end, 1000);
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parents:
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160
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161 module:hook("sasl2/c2s/success", function (event)
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parents:
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162 local session = event.session
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diff changeset
163 event.success:text_tag("authorization-identifier", jid_join(session.username, session.host, session.resource));
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Kim Alvefur <zash@zash.se>
parents:
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164 session.send(event.success);
5049
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Matthew Wild <mwild1@gmail.com>
parents: 5048
diff changeset
165 end, -1000);
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parents: 5048
diff changeset
166
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parents: 5048
diff changeset
167 module:hook("sasl2/c2s/success", function (event)
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diff changeset
168 local session = event.session;
3905
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parents:
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169 local features = st.stanza("stream:features");
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parents:
diff changeset
170 module:fire_event("stream-features", { origin = session, features = features });
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
171 session.send(features);
5049
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parents: 5048
diff changeset
172 end, -1500);
3905
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parents:
diff changeset
173
5021
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parents: 5020
diff changeset
174 -- The gap here is to allow modules to do stuff to the stream after the stanza
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parents: 5020
diff changeset
175 -- is sent, but before we proceed with anything else. This is expected to be
f62b091b1c81 mod_sasl2: Eventually return true from success handler
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parents: 5020
diff changeset
176 -- a common pattern with SASL2, which allows atomic negotiation of a bunch of
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parents: 5020
diff changeset
177 -- stream features.
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diff changeset
178 module:hook("sasl2/c2s/success", function (event) --luacheck: ignore 212/event
5063
53145c6b6b0b mod_sasl2: Clear sasl_handler on final success
Matthew Wild <mwild1@gmail.com>
parents: 5049
diff changeset
179 event.session.sasl_handler = nil;
5021
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diff changeset
180 return true;
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Matthew Wild <mwild1@gmail.com>
parents: 5020
diff changeset
181 end, -2000);
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parents: 5020
diff changeset
182
3905
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parents:
diff changeset
183 local function process_cdata(session, cdata)
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parents:
diff changeset
184 if cdata then
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
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parents:
diff changeset
185 cdata = base64.decode(cdata);
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parents:
diff changeset
186 if not cdata then
5025
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parents: 5023
diff changeset
187 return handle_status(session, "failure", "incorrect-encoding");
3905
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188 end
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Kim Alvefur <zash@zash.se>
parents:
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189 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
190 return handle_status(session, session.sasl_handler:process(cdata));
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parents:
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191 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
192
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
193 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
5088
e9cf361982d5 mod_sasl2: Honour (c2s_)require_encryption config option
Matthew Wild <mwild1@gmail.com>
parents: 5067
diff changeset
194 if secure_auth_only and not session.secure then
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parents: 5067
diff changeset
195 return handle_status(session, "failure", "encryption-required");
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parents: 5067
diff changeset
196 end
3905
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parents:
diff changeset
197 local sasl_handler = session.sasl_handler;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
198 if not sasl_handler then
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parents:
diff changeset
199 sasl_handler = usermanager_get_sasl_handler(host, session);
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parents:
diff changeset
200 session.sasl_handler = sasl_handler;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
202 local mechanism = assert(auth.attr.mechanism);
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
203 if not sasl_handler:select(mechanism) then
5025
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parents: 5023
diff changeset
204 return handle_status(session, "failure", "invalid-mechanism");
3905
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205 end
5048
3697d19d5fd9 mod_sasl2: Store client id if provided
Matthew Wild <mwild1@gmail.com>
parents: 5044
diff changeset
206 local user_agent = auth:get_child("user-agent");
3697d19d5fd9 mod_sasl2: Store client id if provided
Matthew Wild <mwild1@gmail.com>
parents: 5044
diff changeset
207 if user_agent then
3697d19d5fd9 mod_sasl2: Store client id if provided
Matthew Wild <mwild1@gmail.com>
parents: 5044
diff changeset
208 session.client_id = user_agent.attr.id;
3697d19d5fd9 mod_sasl2: Store client id if provided
Matthew Wild <mwild1@gmail.com>
parents: 5044
diff changeset
209 end
3905
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210 local initial = auth:get_child_text("initial-response");
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
211 return process_cdata(session, initial);
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 end);
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214 module:hook_tag(xmlns_sasl2, "response", function (session, response)
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
215 local sasl_handler = session.sasl_handler;
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 if not sasl_handler or not sasl_handler.selected then
5025
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Matthew Wild <mwild1@gmail.com>
parents: 5023
diff changeset
217 return handle_status(session, "failure", "invalid-mechanism");
3905
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
219 return process_cdata(session, response:get_text());
5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 end);