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annotate mod_sasl2/mod_sasl2.lua @ 4961:18774cc621d6

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mod_pubsub_post/README: Update references to trunk with release numbers
author Kim Alvefur <zash@zash.se>
date Tue, 14 Jun 2022 19:08:57 +0200
parents 9c7635911c56
children ed2a9a4c4f01
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3905
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 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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38 if sasl_handler.add_cb_handler then -- luacheck: ignore 542
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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);