aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_register.lua
blob: 832dd991c06476dae55e723cec1496887b3b9e5c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
-- 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_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 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
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);

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

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 blacklisted_ips[session.ip] or (whitelist_only and not 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 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, 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);