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annotate mod_sasl2/mod_sasl2.lua @ 4537:53ee391ca689

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mod_smacks: Fix traceback due to session being destroyed in send() Sending something can cause the OS to notice that the connection is dead and then the connection can be dead at this point. More likely if opportunistic_writes is enabled.
author Kim Alvefur <zash@zash.se>
date Thu, 01 Apr 2021 11:35:26 +0200
parents 5ae2e865eea0
children 9d57aa79c5d9
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5ae2e865eea0 mod_sasl2: Experimental implementation of XEP-0388
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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);