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annotate mod_sasl2/mod_sasl2.lua @ 4895:2542fd80cd15

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mod_turn_external: Fix type of config option (thanks mirux) There was a separate boolean option to enable TLS before, but it was merged with the port number option and it seems the typed API interface got confused. Backport of trunk rev aa7a8aa64d3f
author Kim Alvefur <zash@zash.se>
date Tue, 15 Feb 2022 21:51:52 +0100
parents 9c7635911c56
children ed2a9a4c4f01
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3905
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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 module:hook("stream-features", function(event)
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27 local origin, features = event.origin, event.features;
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28 local log = origin.log or module._log;
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29
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30 if origin.type ~= "c2s_unauthed" then
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31 log("debug", "Already authenticated");
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32 return
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33 end
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34
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35 local sasl_handler = usermanager_get_sasl_handler(host, origin)
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36 origin.sasl_handler = sasl_handler;
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37
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9c7635911c56 mod_sasl2: Silence [luacheck] warning
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38 if sasl_handler.add_cb_handler then -- luacheck: ignore 542
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9d57aa79c5d9 mod_sasl2: Remove channel binding
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39 -- FIXME bring back channel binding
3905
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40 end
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41
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42 local mechanisms = st.stanza("mechanisms", { xmlns = xmlns_sasl2 });
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43
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44 local available_mechanisms = sasl_handler:mechanisms()
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45 for mechanism in pairs(available_mechanisms) do
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46 if disabled_mechanisms:contains(mechanism) then
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47 log("debug", "Not offering disabled mechanism %s", mechanism);
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48 elseif not origin.secure and insecure_mechanisms:contains(mechanism) then
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49 log("debug", "Not offering mechanism %s on insecure connection", mechanism);
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50 else
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51 log("debug", "Offering mechanism %s", mechanism);
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52 mechanisms:text_tag("mechanism", mechanism);
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53 end
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54 end
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55
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56 features:add_direct_child(mechanisms);
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57 end, 1);
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58
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59 local function handle_status(session, status, ret, err_msg)
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60 local err = nil;
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61 if status == "error" then
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62 ret, err = nil, ret;
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63 if not errors.is_err(err) then
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64 err = errors.new({ condition = err, text = err_msg }, { session = session });
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65 end
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66 end
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67
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68 module:fire_event("sasl2/"..session.base_type.."/"..status, {
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69 session = session,
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70 message = ret;
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71 error = err;
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72 });
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73 end
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74
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75 module:hook("sasl2/c2s/failure", function (event)
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76 local session = event.session
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77 session.send(st.stanza("failure", { xmlns = xmlns_sasl2 })
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78 :tag(event.error.condition));
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79 return true;
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80 end);
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81
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82 module:hook("sasl2/c2s/challenge", function (event)
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83 local session = event.session;
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84 session.send(st.stanza("challenge", { xmlns = xmlns_sasl2 })
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85 :text_tag(event.message));
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86 end);
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87
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88 module:hook("sasl2/c2s/success", function (event)
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89 local session = event.session
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90 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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91 if not ok then
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92 handle_status(session, "failure", err);
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93 return true;
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94 end
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95 event.success = st.stanza("success", { xmlns = xmlns_sasl2 });
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96 end, 1000);
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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 event.success:text_tag("authorization-identifier", jid_join(session.username, session.host, session.resource));
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101 session.send(event.success);
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102 local features = st.stanza("stream:features");
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103 module:fire_event("stream-features", { origin = session, features = features });
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104 session.send(features);
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105 end, -1000);
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106
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107 local function process_cdata(session, cdata)
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108 if cdata then
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109 cdata = base64.decode(cdata);
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110 if not cdata then
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111 return handle_status(session, "failure");
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112 end
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113 end
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114 return handle_status(session, session.sasl_handler:process(cdata));
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115 end
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116
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117 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth)
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118 local sasl_handler = session.sasl_handler;
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119 if not sasl_handler then
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120 sasl_handler = usermanager_get_sasl_handler(host, session);
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121 session.sasl_handler = sasl_handler;
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122 end
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123 local mechanism = assert(auth.attr.mechanism);
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124 if not sasl_handler:select(mechanism) then
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125 return handle_status(session, "failure");
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126 end
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127 local initial = auth:get_child_text("initial-response");
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128 return process_cdata(session, initial);
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129 end);
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130
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131 module:hook_tag(xmlns_sasl2, "response", function (session, response)
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132 local sasl_handler = session.sasl_handler;
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133 if not sasl_handler or not sasl_handler.selected then
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134 return handle_status(session, "failure");
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135 end
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136 return process_cdata(session, response:get_text());
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137 end);