prosody-modules
e7b9bc629ecc
mod_sasl2/mod_sasl2.lua

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mod_sasl2/mod_sasl2.lua @ 4941:e7b9bc629ecc

mod_rest: Add special handling to catch MAM results from remote hosts Makes MAM queries to remote hosts works. As the comment says, MAM results from users' local archives or local MUCs are returned via origin.send() which is provided in the event and thus already worked. Results from remote hosts go via normal stanza routing and events, which need this extra handling to catch. This pattern of iq-set, message+, iq-result is generally limited to MAM. Closest similar thing might be MUC join, but to really handle that you would need the webhook callback mechanism.
author Kim Alvefur <zash@zash.se>
date Mon, 16 May 2022 19:47:09 +0200
parent 4796:9c7635911c56
child 5018:ed2a9a4c4f01
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3905
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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
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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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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);