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

1 files changed, 239 insertions, 0 deletions

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);