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authorKim Alvefur <zash@zash.se>2017-10-07 22:00:50 +0200
committerKim Alvefur <zash@zash.se>2017-10-07 22:00:50 +0200
commitd00ffdb2495a6ae9f61c9deacb6ad1bba3d9c7f5 (patch)
tree757d4e6c25935145f72c63c6ea76f4d66e64af18
parentd3bdcaeda0e621f05abaa6c8a86b52dc20a02859 (diff)
downloadprosody-d00ffdb2495a6ae9f61c9deacb6ad1bba3d9c7f5.tar.gz
prosody-d00ffdb2495a6ae9f61c9deacb6ad1bba3d9c7f5.zip
mod_register: Split into mod_register_ibr and mod_user_account_management (#723)
- mod_register_ibr handles in-band registration - mod_user_account_management handles password change and user deletion
-rw-r--r--plugins/mod_register.lua301
-rw-r--r--plugins/mod_register_ibr.lua239
-rw-r--r--plugins/mod_user_account_management.lua86
3 files changed, 328 insertions, 298 deletions
diff --git a/plugins/mod_register.lua b/plugins/mod_register.lua
index c17a1fcd..763e2fd9 100644
--- a/plugins/mod_register.lua
+++ b/plugins/mod_register.lua
@@ -7,305 +7,10 @@
--
-local st = require "util.stanza";
-local dataform_new = require "util.dataforms".new;
-local usermanager_user_exists = require "core.usermanager".user_exists;
-local usermanager_create_user = require "core.usermanager".create_user;
-local usermanager_set_password = require "core.usermanager".set_password;
-local usermanager_delete_user = require "core.usermanager".delete_user;
-local nodeprep = require "util.encodings".stringprep.nodeprep;
-local jid_bare = require "util.jid".bare;
-local create_throttle = require "util.throttle".create;
-local new_cache = require "util.cache".new;
-local ip_util = require "util.ip";
-local new_ip = ip_util.new_ip;
-local match_ip = ip_util.match;
-local parse_cidr = ip_util.parse_cidr;
-
-local compat = module:get_option_boolean("registration_compat", true);
local allow_registration = module:get_option_boolean("allow_registration", false);
-local additional_fields = module:get_option("additional_registration_fields", {});
-local require_encryption = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
-
-local account_details = module:open_store("account_details");
-
-local field_map = {
- username = { name = "username", type = "text-single", label = "Username", required = true };
- password = { name = "password", type = "text-private", label = "Password", required = true };
- nick = { name = "nick", type = "text-single", label = "Nickname" };
- name = { name = "name", type = "text-single", label = "Full Name" };
- first = { name = "first", type = "text-single", label = "Given Name" };
- last = { name = "last", type = "text-single", label = "Family Name" };
- email = { name = "email", type = "text-single", label = "Email" };
- address = { name = "address", type = "text-single", label = "Street" };
- city = { name = "city", type = "text-single", label = "City" };
- state = { name = "state", type = "text-single", label = "State" };
- zip = { name = "zip", type = "text-single", label = "Postal code" };
- phone = { name = "phone", type = "text-single", label = "Telephone number" };
- url = { name = "url", type = "text-single", label = "Webpage" };
- date = { name = "date", type = "text-single", label = "Birth date" };
-};
-
-local title = module:get_option_string("registration_title",
- "Creating a new account");
-local instructions = module:get_option_string("registration_instructions",
- "Choose a username and password for use with this service.");
-
-local registration_form = dataform_new{
- title = title;
- instructions = instructions;
-
- field_map.username;
- field_map.password;
-};
-
-local registration_query = st.stanza("query", {xmlns = "jabber:iq:register"})
- :tag("instructions"):text(instructions):up()
- :tag("username"):up()
- :tag("password"):up();
-
-for _, field in ipairs(additional_fields) do
- if type(field) == "table" then
- registration_form[#registration_form + 1] = field;
- elseif field_map[field] or field_map[field:sub(1, -2)] then
- if field:match("%+$") then
- field = field:sub(1, -2);
- field_map[field].required = true;
- end
- registration_form[#registration_form + 1] = field_map[field];
- registration_query:tag(field):up();
- else
- module:log("error", "Unknown field %q", field);
- end
+if allow_registration then
+ module:depends("register_ibr");
end
-registration_query:add_child(registration_form:form());
-
-module:add_feature("jabber:iq:register");
-
-local register_stream_feature = st.stanza("register", {xmlns="http://jabber.org/features/iq-register"}):up();
-module:hook("stream-features", function(event)
- local session, features = event.origin, event.features;
-
- -- Advertise registration to unauthorized clients only.
- if not(allow_registration) or session.type ~= "c2s_unauthed" or (require_encryption and not session.secure) then
- return
- end
-
- features:add_child(register_stream_feature);
-end);
-
--- Password change and account deletion handler
-local function handle_registration_stanza(event)
- local session, stanza = event.origin, event.stanza;
- local log = session.log or module._log;
-
- local query = stanza.tags[1];
- if stanza.attr.type == "get" then
- local reply = st.reply(stanza);
- reply:tag("query", {xmlns = "jabber:iq:register"})
- :tag("registered"):up()
- :tag("username"):text(session.username):up()
- :tag("password"):up();
- session.send(reply);
- else -- stanza.attr.type == "set"
- if query.tags[1] and query.tags[1].name == "remove" then
- local username, host = session.username, session.host;
-
- -- This one weird trick sends a reply to this stanza before the user is deleted
- local old_session_close = session.close;
- session.close = function(self, ...)
- self.send(st.reply(stanza));
- return old_session_close(self, ...);
- end
-
- local ok, err = usermanager_delete_user(username, host);
-
- if not ok then
- log("debug", "Removing user account %s@%s failed: %s", username, host, err);
- session.close = old_session_close;
- session.send(st.error_reply(stanza, "cancel", "service-unavailable", err));
- return true;
- end
-
- log("info", "User removed their account: %s@%s", username, host);
- module:fire_event("user-deregistered", { username = username, host = host, source = "mod_register", session = session });
- else
- local username = nodeprep(query:get_child_text("username"));
- local password = query:get_child_text("password");
- if username and password then
- if username == session.username then
- if usermanager_set_password(username, password, session.host, session.resource) then
- session.send(st.reply(stanza));
- else
- -- TODO unable to write file, file may be locked, etc, what's the correct error?
- session.send(st.error_reply(stanza, "wait", "internal-server-error"));
- end
- else
- session.send(st.error_reply(stanza, "modify", "bad-request"));
- end
- else
- session.send(st.error_reply(stanza, "modify", "bad-request"));
- end
- end
- end
- return true;
-end
-
-module:hook("iq/self/jabber:iq:register:query", handle_registration_stanza);
-if compat then
- module:hook("iq/host/jabber:iq:register:query", function (event)
- local session, stanza = event.origin, event.stanza;
- if session.type == "c2s" and jid_bare(stanza.attr.to) == session.host then
- return handle_registration_stanza(event);
- end
- end);
-end
-
-local function parse_response(query)
- local form = query:get_child("x", "jabber:x:data");
- if form then
- return registration_form:data(form);
- else
- local data = {};
- local errors = {};
- for _, field in ipairs(registration_form) do
- local name, required = field.name, field.required;
- if field_map[name] then
- data[name] = query:get_child_text(name);
- if (not data[name] or #data[name] == 0) and required then
- errors[name] = "Required value missing";
- end
- end
- end
- if next(errors) then
- return data, errors;
- end
- return data;
- end
-end
-
-local min_seconds_between_registrations = module:get_option_number("min_seconds_between_registrations");
-local whitelist_only = module:get_option_boolean("whitelist_registration_only");
-local whitelisted_ips = module:get_option_set("registration_whitelist", { "127.0.0.1", "::1" })._items;
-local blacklisted_ips = module:get_option_set("registration_blacklist", {})._items;
-
-local throttle_max = module:get_option_number("registration_throttle_max", min_seconds_between_registrations and 1);
-local throttle_period = module:get_option_number("registration_throttle_period", min_seconds_between_registrations);
-local throttle_cache_size = module:get_option_number("registration_throttle_cache_size", 100);
-local blacklist_overflow = module:get_option_boolean("blacklist_on_registration_throttle_overload", false);
-
-local throttle_cache = new_cache(throttle_cache_size, blacklist_overflow and function (ip, throttle)
- if not throttle:peek() then
- module:log("info", "Adding ip %s to registration blacklist", ip);
- blacklisted_ips[ip] = true;
- end
-end or nil);
-
-local function check_throttle(ip)
- if not throttle_max then return true end
- local throttle = throttle_cache:get(ip);
- if not throttle then
- throttle = create_throttle(throttle_max, throttle_period);
- end
- throttle_cache:set(ip, throttle);
- return throttle:poll(1);
-end
-
-local function ip_in_set(set, ip)
- if set[ip] then
- return true;
- end
- ip = new_ip(ip);
- for in_set in pairs(set) do
- if match_ip(ip, parse_cidr(in_set)) then
- return true;
- end
- end
- return false;
-end
-
--- In-band registration
-module:hook("stanza/iq/jabber:iq:register:query", function(event)
- local session, stanza = event.origin, event.stanza;
- local log = session.log or module._log;
- if not(allow_registration) or session.type ~= "c2s_unauthed" then
- log("debug", "Attempted registration when disabled or already authenticated");
- session.send(st.error_reply(stanza, "cancel", "service-unavailable"));
- elseif require_encryption and not session.secure then
- session.send(st.error_reply(stanza, "modify", "policy-violation", "Encryption is required"));
- else
- local query = stanza.tags[1];
- if stanza.attr.type == "get" then
- local reply = st.reply(stanza);
- reply:add_child(registration_query);
- session.send(reply);
- elseif stanza.attr.type == "set" then
- if query.tags[1] and query.tags[1].name == "remove" then
- session.send(st.error_reply(stanza, "auth", "registration-required"));
- else
- local data, errors = parse_response(query);
- if errors then
- log("debug", "Error parsing registration form:");
- for field, err in pairs(errors) do
- log("debug", "Field %q: %s", field, err);
- end
- session.send(st.error_reply(stanza, "modify", "not-acceptable"));
- else
- -- Check that the user is not blacklisted or registering too often
- if not session.ip then
- log("debug", "User's IP not known; can't apply blacklist/whitelist");
- elseif ip_in_set(blacklisted_ips, session.ip) or (whitelist_only and not ip_in_set(whitelisted_ips, session.ip)) then
- session.send(st.error_reply(stanza, "cancel", "not-acceptable", "You are not allowed to register an account."));
- return true;
- elseif throttle_max and not ip_in_set(whitelisted_ips, session.ip) then
- if not check_throttle(session.ip) then
- log("debug", "Registrations over limit for ip %s", session.ip or "?");
- session.send(st.error_reply(stanza, "wait", "not-acceptable"));
- return true;
- end
- end
- local username, password = nodeprep(data.username), data.password;
- data.username, data.password = nil, nil;
- local host = module.host;
- if not username or username == "" then
- log("debug", "The requested username is invalid.");
- session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is invalid."));
- return true;
- end
- local user = { username = username , host = host, additional = data, ip = session.ip, session = session, allowed = true }
- module:fire_event("user-registering", user);
- if not user.allowed then
- log("debug", "Registration disallowed by module");
- session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is forbidden."));
- elseif usermanager_user_exists(username, host) then
- log("debug", "Attempt to register with existing username");
- session.send(st.error_reply(stanza, "cancel", "conflict", "The requested username already exists."));
- else
- -- TODO unable to write file, file may be locked, etc, what's the correct error?
- local error_reply = st.error_reply(stanza, "wait", "internal-server-error", "Failed to write data to disk.");
- if usermanager_create_user(username, password, host) then
- data.registered = os.time();
- if not account_details:set(username, data) then
- log("debug", "Could not store extra details");
- usermanager_delete_user(username, host);
- session.send(error_reply);
- return true;
- end
- session.send(st.reply(stanza)); -- user created!
- log("info", "User account created: %s@%s", username, host);
- module:fire_event("user-registered", {
- username = username, host = host, source = "mod_register",
- session = session });
- else
- log("debug", "Could not create user");
- session.send(error_reply);
- end
- end
- end
- end
- end
- end
- return true;
-end);
+module:depends("user_account_management");
diff --git a/plugins/mod_register_ibr.lua b/plugins/mod_register_ibr.lua
new file mode 100644
index 00000000..b545d09b
--- /dev/null
+++ b/plugins/mod_register_ibr.lua
@@ -0,0 +1,239 @@
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+
+local st = require "util.stanza";
+local dataform_new = require "util.dataforms".new;
+local usermanager_user_exists = require "core.usermanager".user_exists;
+local usermanager_create_user = require "core.usermanager".create_user;
+local usermanager_delete_user = require "core.usermanager".delete_user;
+local nodeprep = require "util.encodings".stringprep.nodeprep;
+local create_throttle = require "util.throttle".create;
+local new_cache = require "util.cache".new;
+local ip_util = require "util.ip";
+local new_ip = ip_util.new_ip;
+local match_ip = ip_util.match;
+local parse_cidr = ip_util.parse_cidr;
+
+local additional_fields = module:get_option("additional_registration_fields", {});
+local require_encryption = module:get_option_boolean("c2s_require_encryption",
+ module:get_option_boolean("require_encryption", false));
+
+local account_details = module:open_store("account_details");
+
+local field_map = {
+ username = { name = "username", type = "text-single", label = "Username", required = true };
+ password = { name = "password", type = "text-private", label = "Password", required = true };
+ nick = { name = "nick", type = "text-single", label = "Nickname" };
+ name = { name = "name", type = "text-single", label = "Full Name" };
+ first = { name = "first", type = "text-single", label = "Given Name" };
+ last = { name = "last", type = "text-single", label = "Family Name" };
+ email = { name = "email", type = "text-single", label = "Email" };
+ address = { name = "address", type = "text-single", label = "Street" };
+ city = { name = "city", type = "text-single", label = "City" };
+ state = { name = "state", type = "text-single", label = "State" };
+ zip = { name = "zip", type = "text-single", label = "Postal code" };
+ phone = { name = "phone", type = "text-single", label = "Telephone number" };
+ url = { name = "url", type = "text-single", label = "Webpage" };
+ date = { name = "date", type = "text-single", label = "Birth date" };
+};
+
+local title = module:get_option_string("registration_title",
+ "Creating a new account");
+local instructions = module:get_option_string("registration_instructions",
+ "Choose a username and password for use with this service.");
+
+local registration_form = dataform_new{
+ title = title;
+ instructions = instructions;
+
+ field_map.username;
+ field_map.password;
+};
+
+local registration_query = st.stanza("query", {xmlns = "jabber:iq:register"})
+ :tag("instructions"):text(instructions):up()
+ :tag("username"):up()
+ :tag("password"):up();
+
+for _, field in ipairs(additional_fields) do
+ if type(field) == "table" then
+ registration_form[#registration_form + 1] = field;
+ elseif field_map[field] or field_map[field:sub(1, -2)] then
+ if field:match("%+$") then
+ field = field:sub(1, -2);
+ field_map[field].required = true;
+ end
+
+ registration_form[#registration_form + 1] = field_map[field];
+ registration_query:tag(field):up();
+ else
+ module:log("error", "Unknown field %q", field);
+ end
+end
+registration_query:add_child(registration_form:form());
+
+local register_stream_feature = st.stanza("register", {xmlns="http://jabber.org/features/iq-register"}):up();
+module:hook("stream-features", function(event)
+ local session, features = event.origin, event.features;
+
+ -- Advertise registration to unauthorized clients only.
+ if session.type ~= "c2s_unauthed" or (require_encryption and not session.secure) then
+ return
+ end
+
+ features:add_child(register_stream_feature);
+end);
+
+local function parse_response(query)
+ local form = query:get_child("x", "jabber:x:data");
+ if form then
+ return registration_form:data(form);
+ else
+ local data = {};
+ local errors = {};
+ for _, field in ipairs(registration_form) do
+ local name, required = field.name, field.required;
+ if field_map[name] then
+ data[name] = query:get_child_text(name);
+ if (not data[name] or #data[name] == 0) and required then
+ errors[name] = "Required value missing";
+ end
+ end
+ end
+ if next(errors) then
+ return data, errors;
+ end
+ return data;
+ end
+end
+
+local min_seconds_between_registrations = module:get_option_number("min_seconds_between_registrations");
+local whitelist_only = module:get_option_boolean("whitelist_registration_only");
+local whitelisted_ips = module:get_option_set("registration_whitelist", { "127.0.0.1", "::1" })._items;
+local blacklisted_ips = module:get_option_set("registration_blacklist", {})._items;
+
+local throttle_max = module:get_option_number("registration_throttle_max", min_seconds_between_registrations and 1);
+local throttle_period = module:get_option_number("registration_throttle_period", min_seconds_between_registrations);
+local throttle_cache_size = module:get_option_number("registration_throttle_cache_size", 100);
+local blacklist_overflow = module:get_option_boolean("blacklist_on_registration_throttle_overload", false);
+
+local throttle_cache = new_cache(throttle_cache_size, blacklist_overflow and function (ip, throttle)
+ if not throttle:peek() then
+ module:log("info", "Adding ip %s to registration blacklist", ip);
+ blacklisted_ips[ip] = true;
+ end
+end or nil);
+
+local function check_throttle(ip)
+ if not throttle_max then return true end
+ local throttle = throttle_cache:get(ip);
+ if not throttle then
+ throttle = create_throttle(throttle_max, throttle_period);
+ end
+ throttle_cache:set(ip, throttle);
+ return throttle:poll(1);
+end
+
+local function ip_in_set(set, ip)
+ if set[ip] then
+ return true;
+ end
+ ip = new_ip(ip);
+ for in_set in pairs(set) do
+ if match_ip(ip, parse_cidr(in_set)) then
+ return true;
+ end
+ end
+ return false;
+end
+
+-- In-band registration
+module:hook("stanza/iq/jabber:iq:register:query", function(event)
+ local session, stanza = event.origin, event.stanza;
+ local log = session.log or module._log;
+
+ if session.type ~= "c2s_unauthed" then
+ log("debug", "Attempted registration when disabled or already authenticated");
+ session.send(st.error_reply(stanza, "cancel", "service-unavailable"));
+ elseif require_encryption and not session.secure then
+ session.send(st.error_reply(stanza, "modify", "policy-violation", "Encryption is required"));
+ else
+ local query = stanza.tags[1];
+ if stanza.attr.type == "get" then
+ local reply = st.reply(stanza);
+ reply:add_child(registration_query);
+ session.send(reply);
+ elseif stanza.attr.type == "set" then
+ if query.tags[1] and query.tags[1].name == "remove" then
+ session.send(st.error_reply(stanza, "auth", "registration-required"));
+ else
+ local data, errors = parse_response(query);
+ if errors then
+ log("debug", "Error parsing registration form:");
+ for field, err in pairs(errors) do
+ log("debug", "Field %q: %s", field, err);
+ end
+ session.send(st.error_reply(stanza, "modify", "not-acceptable"));
+ else
+ -- Check that the user is not blacklisted or registering too often
+ if not session.ip then
+ log("debug", "User's IP not known; can't apply blacklist/whitelist");
+ elseif ip_in_set(blacklisted_ips, session.ip) or (whitelist_only and not ip_in_set(whitelisted_ips, session.ip)) then
+ session.send(st.error_reply(stanza, "cancel", "not-acceptable", "You are not allowed to register an account."));
+ return true;
+ elseif throttle_max and not ip_in_set(whitelisted_ips, session.ip) then
+ if not check_throttle(session.ip) then
+ log("debug", "Registrations over limit for ip %s", session.ip or "?");
+ session.send(st.error_reply(stanza, "wait", "not-acceptable"));
+ return true;
+ end
+ end
+ local username, password = nodeprep(data.username), data.password;
+ data.username, data.password = nil, nil;
+ local host = module.host;
+ if not username or username == "" then
+ log("debug", "The requested username is invalid.");
+ session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is invalid."));
+ return true;
+ end
+ local user = { username = username , host = host, additional = data, ip = session.ip, session = session, allowed = true }
+ module:fire_event("user-registering", user);
+ if not user.allowed then
+ log("debug", "Registration disallowed by module");
+ session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is forbidden."));
+ elseif usermanager_user_exists(username, host) then
+ log("debug", "Attempt to register with existing username");
+ session.send(st.error_reply(stanza, "cancel", "conflict", "The requested username already exists."));
+ else
+ -- TODO unable to write file, file may be locked, etc, what's the correct error?
+ local error_reply = st.error_reply(stanza, "wait", "internal-server-error", "Failed to write data to disk.");
+ if usermanager_create_user(username, password, host) then
+ data.registered = os.time();
+ if not account_details:set(username, data) then
+ log("debug", "Could not store extra details");
+ usermanager_delete_user(username, host);
+ session.send(error_reply);
+ return true;
+ end
+ session.send(st.reply(stanza)); -- user created!
+ log("info", "User account created: %s@%s", username, host);
+ module:fire_event("user-registered", {
+ username = username, host = host, source = "mod_register",
+ session = session });
+ else
+ log("debug", "Could not create user");
+ session.send(error_reply);
+ end
+ end
+ end
+ end
+ end
+ end
+ return true;
+end);
diff --git a/plugins/mod_user_account_management.lua b/plugins/mod_user_account_management.lua
new file mode 100644
index 00000000..615c1ed6
--- /dev/null
+++ b/plugins/mod_user_account_management.lua
@@ -0,0 +1,86 @@
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+
+local st = require "util.stanza";
+local usermanager_set_password = require "core.usermanager".set_password;
+local usermanager_delete_user = require "core.usermanager".delete_user;
+local nodeprep = require "util.encodings".stringprep.nodeprep;
+local jid_bare = require "util.jid".bare;
+
+local compat = module:get_option_boolean("registration_compat", true);
+
+module:add_feature("jabber:iq:register");
+
+-- Password change and account deletion handler
+local function handle_registration_stanza(event)
+ local session, stanza = event.origin, event.stanza;
+ local log = session.log or module._log;
+
+ local query = stanza.tags[1];
+ if stanza.attr.type == "get" then
+ local reply = st.reply(stanza);
+ reply:tag("query", {xmlns = "jabber:iq:register"})
+ :tag("registered"):up()
+ :tag("username"):text(session.username):up()
+ :tag("password"):up();
+ session.send(reply);
+ else -- stanza.attr.type == "set"
+ if query.tags[1] and query.tags[1].name == "remove" then
+ local username, host = session.username, session.host;
+
+ -- This one weird trick sends a reply to this stanza before the user is deleted
+ local old_session_close = session.close;
+ session.close = function(self, ...)
+ self.send(st.reply(stanza));
+ return old_session_close(self, ...);
+ end
+
+ local ok, err = usermanager_delete_user(username, host);
+
+ if not ok then
+ log("debug", "Removing user account %s@%s failed: %s", username, host, err);
+ session.close = old_session_close;
+ session.send(st.error_reply(stanza, "cancel", "service-unavailable", err));
+ return true;
+ end
+
+ log("info", "User removed their account: %s@%s", username, host);
+ module:fire_event("user-deregistered", { username = username, host = host, source = "mod_register", session = session });
+ else
+ local username = nodeprep(query:get_child_text("username"));
+ local password = query:get_child_text("password");
+ if username and password then
+ if username == session.username then
+ if usermanager_set_password(username, password, session.host, session.resource) then
+ session.send(st.reply(stanza));
+ else
+ -- TODO unable to write file, file may be locked, etc, what's the correct error?
+ session.send(st.error_reply(stanza, "wait", "internal-server-error"));
+ end
+ else
+ session.send(st.error_reply(stanza, "modify", "bad-request"));
+ end
+ else
+ session.send(st.error_reply(stanza, "modify", "bad-request"));
+ end
+ end
+ end
+ return true;
+end
+
+module:hook("iq/self/jabber:iq:register:query", handle_registration_stanza);
+if compat then
+ module:hook("iq/host/jabber:iq:register:query", function (event)
+ local session, stanza = event.origin, event.stanza;
+ if session.type == "c2s" and jid_bare(stanza.attr.to) == session.host then
+ return handle_registration_stanza(event);
+ end
+ end);
+end
+