prosody-modules
7040d0772758
mod_muc_http_auth/mod_muc_http_auth.lua

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mod_muc_http_auth/mod_muc_http_auth.lua @ 5596:7040d0772758

mod_http_oauth2: Implement RFC 8628 Device Authorization Grant Meant for devices without easy access to a web browser, such as refrigerators and toasters, which definitely need to be running OAuth-enabled XMPP clients! Could be used for CLI tools that might have trouble running a http server needed for the authorization code flow.
author Kim Alvefur <zash@zash.se>
date Mon, 10 Jul 2023 07:16:54 +0200
parent 4724:b125db92bac6
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1 local http = require "net.http";
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2 local jid_bare = require "util.jid".bare;
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3 local jid_host = require "util.jid".host;
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4 local jid_node = require "util.jid".node;
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5 local jid_resource = require "util.jid".resource;
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6 local json = require "util.json";
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7 local set = require "util.set";
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8 local st = require "util.stanza";
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9 local urlencode = require "util.http".urlencode;
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10 local wait_for = require "util.async".wait_for;
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11
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12 local authorization_url = module:get_option("muc_http_auth_url", "")
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13 local enabled_for = module:get_option("muc_http_auth_enabled_for", nil)
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14 local disabled_for = module:get_option("muc_http_auth_disabled_for", nil)
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15 local insecure = module:get_option("muc_http_auth_insecure", false) --For development purposes
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16 local authorize_registration = module:get_option("muc_http_auth_authorize_registration", false)
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17 local authorization_header = module:get_option("muc_http_auth_authorization_header", nil)
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18
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19 local options = {method="GET", insecure=insecure}
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20 if authorization_header then
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21 options.headers = {["Authorization"] = authorization_header};
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22 end
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23
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24 local verbs = {presence='join', iq='register'};
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25
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26 local function must_be_authorized(room_node, user_host)
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27 -- If none of these is set, all rooms need authorization
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28 if not enabled_for and not disabled_for then return true; end
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29
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30 if enabled_for then
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31 local enabled_for_host = set.new(enabled_for[user_host] or {});
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32 local enabled_for_all = set.new(enabled_for['all'] or {});
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33 return enabled_for_host:contains(room_node) or enabled_for_all:contains(room_node);
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34
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35 end
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36 if disabled_for then
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37 local disabled_for_host = set.new(disabled_for[user_host] or {});
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38 local disabled_for_all = set.new(disabled_for['all'] or {});
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39 return not disabled_for_host:contains(room_node) and not disabled_for_all:contains(room_node);
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40 end
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41 end
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42
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43 local function handle_success(response)
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44 local body = json.decode(response.body or "") or {}
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45 response = {
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46 err = body.error,
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47 allowed = body.allowed,
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48 code = response.code
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49 }
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50 return {response=response, err=response.err};
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51 end
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52
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53 local function handle_error(err)
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54 return {err=err};
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55 end
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56
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57 local function handle_presence(event)
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58 local stanza = event.stanza;
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59 if stanza.name ~= "iq" and stanza.name ~= "presence" or stanza.attr.type == "unavailable" then return; end
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60
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61 local room, origin = event.room, event.origin;
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62 if (not room) or (not origin) then return; end
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63
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64 local user_bare_jid = jid_bare(stanza.attr.from)
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65 if not must_be_authorized(jid_node(room.jid), jid_host(user_bare_jid)) then
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66 module:log("debug", "Authorization not required for "..jid_node(room.jid).." and "..jid_host(user_bare_jid))
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67 return;
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68 end
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69
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70 local user_nickname = jid_resource(stanza.attr.to);
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71
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72 -- Nickname is mandatory to enter a MUC
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73 if not user_nickname then return; end
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74
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75 local url = authorization_url .. "?userJID=" .. urlencode(user_bare_jid) .."&mucJID=" .. urlencode(room.jid) .. "&nickname=" .. urlencode(user_nickname);
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76
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77 local result = wait_for(http.request(url, options):next(handle_success, handle_error));
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78 local response, err = result.response, result.err;
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79
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80 local verb = verbs[stanza.name];
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81 if not (response and response.allowed) then
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82 -- User is not authorized to join this room
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83 err = (response or {}).err or err
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84 module:log("debug", user_bare_jid .. " is not authorized to " ..verb.. ": " .. room.jid .. " Error: " .. tostring(err));
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85 origin.send(st.error_reply(stanza, "auth", "not-authorized", nil, module.host));
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86 return true;
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87 end
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88
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89 module:log("debug", user_bare_jid .. " is authorized to " .. verb .. ": " .. room.jid);
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90 return;
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91 end
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92
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93 if authorize_registration then
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94 module:hook("muc-register-iq", handle_presence);
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95 end
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96
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97 module:hook("muc-occupant-pre-join", handle_presence);