plugins/mod_register.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10 local st = require "util.stanza";
  11 local dataform_new = require "util.dataforms".new;
  12 local usermanager_user_exists = require "core.usermanager".user_exists;
  13 local usermanager_create_user = require "core.usermanager".create_user;
  14 local usermanager_set_password = require "core.usermanager".set_password;
  15 local usermanager_delete_user = require "core.usermanager".delete_user;
  16 local nodeprep = require "util.encodings".stringprep.nodeprep;
  17 local jid_bare = require "util.jid".bare;
  18 local create_throttle = require "util.throttle".create;
  19
  20 local compat = module:get_option_boolean("registration_compat", true);
  21 local allow_registration = module:get_option_boolean("allow_registration", false);
  22 local additional_fields = module:get_option("additional_registration_fields", {});
  23
  24 local account_details = module:open_store("account_details");
  25
  26 local field_map = {
  27         username = { name = "username", type = "text-single", label = "Username", required = true };
  28         password = { name = "password", type = "text-private", label = "Password", required = true };
  29         nick = { name = "nick", type = "text-single", label = "Nickname" };
  30         name = { name = "name", type = "text-single", label = "Full Name" };
  31         first = { name = "first", type = "text-single", label = "Given Name" };
  32         last = { name = "last", type = "text-single", label = "Family Name" };
  33         email = { name = "email", type = "text-single", label = "Email" };
  34         address = { name = "address", type = "text-single", label = "Street" };
  35         city = { name = "city", type = "text-single", label = "City" };
  36         state = { name = "state", type = "text-single", label = "State" };
  37         zip = { name = "zip", type = "text-single", label = "Postal code" };
  38         phone = { name = "phone", type = "text-single", label = "Telephone number" };
  39         url = { name = "url", type = "text-single", label = "Webpage" };
  40         date = { name = "date", type = "text-single", label = "Birth date" };
  41 };
  42
  43 local registration_form = dataform_new{
  44         title = "Creating a new account";
  45         instructions = "Choose a username and password for use with this service.";
  46
  47         field_map.username;
  48         field_map.password;
  49 };
  50
  51 local registration_query = st.stanza("query", {xmlns = "jabber:iq:register"})
  52         :tag("instructions"):text("Choose a username and password for use with this service."):up()
  53         :tag("username"):up()
  54         :tag("password"):up();
  55
  56 for _, field in ipairs(additional_fields) do
  57         if type(field) == "table" then
  58                 registration_form[#registration_form + 1] = field;
  59         else
  60                 if field:match("%+$") then
  61                         field = field:sub(1, #field - 1);
  62                         field_map[field].required = true;
  63                 end
  64
  65                 registration_form[#registration_form + 1] = field_map[field];
  66                 registration_query:tag(field):up();
  67         end
  68 end
  69 registration_query:add_child(registration_form:form());
  70
  71 module:add_feature("jabber:iq:register");
  72
  73 local register_stream_feature = st.stanza("register", {xmlns="http://jabber.org/features/iq-register"}):up();
  74 module:hook("stream-features", function(event)
  75         local session, features = event.origin, event.features;
  76
  77         -- Advertise registration to unauthorized clients only.
  78         if not(allow_registration) or session.type ~= "c2s_unauthed" then
  79                 return
  80         end
  81
  82         features:add_child(register_stream_feature);
  83 end);
  84
  85 local function handle_registration_stanza(event)
  86         local session, stanza = event.origin, event.stanza;
  87         local log = session.log or module._log;
  88
  89         local query = stanza.tags[1];
  90         if stanza.attr.type == "get" then
  91                 local reply = st.reply(stanza);
  92                 reply:tag("query", {xmlns = "jabber:iq:register"})
  93                         :tag("registered"):up()
  94                         :tag("username"):text(session.username):up()
  95                         :tag("password"):up();
  96                 session.send(reply);
  97         else -- stanza.attr.type == "set"
  98                 if query.tags[1] and query.tags[1].name == "remove" then
  99                         local username, host = session.username, session.host;
 100
 101                         -- This one weird trick sends a reply to this stanza before the user is deleted
 102                         local old_session_close = session.close;
 103                         session.close = function(session, ...)
 104                                 session.send(st.reply(stanza));
 105                                 return old_session_close(session, ...);
 106                         end
 107
 108                         local ok, err = usermanager_delete_user(username, host);
 109
 110                         if not ok then
 111                                 log("debug", "Removing user account %s@%s failed: %s", username, host, err);
 112                                 session.close = old_session_close;
 113                                 session.send(st.error_reply(stanza, "cancel", "service-unavailable", err));
 114                                 return true;
 115                         end
 116
 117                         log("info", "User removed their account: %s@%s", username, host);
 118                         module:fire_event("user-deregistered", { username = username, host = host, source = "mod_register", session = session });
 119                 else
 120                         local username = nodeprep(query:get_child_text("username"));
 121                         local password = query:get_child_text("password");
 122                         if username and password then
 123                                 if username == session.username then
 124                                         if usermanager_set_password(username, password, session.host) then
 125                                                 session.send(st.reply(stanza));
 126                                         else
 127                                                 -- TODO unable to write file, file may be locked, etc, what's the correct error?
 128                                                 session.send(st.error_reply(stanza, "wait", "internal-server-error"));
 129                                         end
 130                                 else
 131                                         session.send(st.error_reply(stanza, "modify", "bad-request"));
 132                                 end
 133                         else
 134                                 session.send(st.error_reply(stanza, "modify", "bad-request"));
 135                         end
 136                 end
 137         end
 138         return true;
 139 end
 140
 141 module:hook("iq/self/jabber:iq:register:query", handle_registration_stanza);
 142 if compat then
 143         module:hook("iq/host/jabber:iq:register:query", function (event)
 144                 local session, stanza = event.origin, event.stanza;
 145                 if session.type == "c2s" and jid_bare(stanza.attr.to) == session.host then
 146                         return handle_registration_stanza(event);
 147                 end
 148         end);
 149 end
 150
 151 local function parse_response(query)
 152         local form = query:get_child("x", "jabber:x:data");
 153         if form then
 154                 return registration_form:data(form);
 155         else
 156                 local data = {};
 157                 local errors = {};
 158                 for _, field in ipairs(registration_form) do
 159                         local name, required = field.name, field.required;
 160                         if field_map[name] then
 161                                 data[name] = query:get_child_text(name);
 162                                 if (not data[name] or #data[name] == 0) and required then
 163                                         errors[name] = "Required value missing";
 164                                 end
 165                         end
 166                 end
 167                 if next(errors) then
 168                         return data, errors;
 169                 end
 170                 return data;
 171         end
 172 end
 173
 174 local recent_ips = {};
 175 local min_seconds_between_registrations = module:get_option_number("min_seconds_between_registrations");
 176 local whitelist_only = module:get_option_boolean("whitelist_registration_only");
 177 local whitelisted_ips = module:get_option_set("registration_whitelist", { "127.0.0.1" })._items;
 178 local blacklisted_ips = module:get_option_set("registration_blacklist", {})._items;
 179
 180 local throttle_max = module:get_option_number("registration_throttle_max", min_seconds_between_registrations and 1);
 181 local throttle_period = module:get_option_number("registration_throttle_period", min_seconds_between_registrations);
 182
 183 local function check_throttle(ip)
 184         if not throttle_max then return true end
 185         local throttle = recent_ips[ip];
 186         if not throttle then
 187                 throttle = create_throttle(throttle_max, throttle_period);
 188                 recent_ips[ip] = throttle;
 189         end
 190         return throttle:poll(1);
 191 end
 192
 193 module:hook("stanza/iq/jabber:iq:register:query", function(event)
 194         local session, stanza = event.origin, event.stanza;
 195         local log = session.log or module._log;
 196
 197         if not(allow_registration) or session.type ~= "c2s_unauthed" then
 198                 session.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 199         else
 200                 local query = stanza.tags[1];
 201                 if stanza.attr.type == "get" then
 202                         local reply = st.reply(stanza);
 203                         reply:add_child(registration_query);
 204                         session.send(reply);
 205                 elseif stanza.attr.type == "set" then
 206                         if query.tags[1] and query.tags[1].name == "remove" then
 207                                 session.send(st.error_reply(stanza, "auth", "registration-required"));
 208                         else
 209                                 local data, errors = parse_response(query);
 210                                 if errors then
 211                                         session.send(st.error_reply(stanza, "modify", "not-acceptable"));
 212                                 else
 213                                         -- Check that the user is not blacklisted or registering too often
 214                                         if not session.ip then
 215                                                 log("debug", "User's IP not known; can't apply blacklist/whitelist");
 216                                         elseif blacklisted_ips[session.ip] or (whitelist_only and not whitelisted_ips[session.ip]) then
 217                                                 session.send(st.error_reply(stanza, "cancel", "not-acceptable", "You are not allowed to register an account."));
 218                                                 return true;
 219                                         elseif min_seconds_between_registrations and not whitelisted_ips[session.ip] then
 220                                                 if check_throttle(session.ip) then
 221                                                         session.send(st.error_reply(stanza, "wait", "not-acceptable"));
 222                                                         return true;
 223                                                 end
 224                                         end
 225                                         local username, password = nodeprep(data.username), data.password;
 226                                         data.username, data.password = nil, nil;
 227                                         local host = module.host;
 228                                         if not username or username == "" then
 229                                                 session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is invalid."));
 230                                                 return true;
 231                                         end
 232                                         local user = { username = username , host = host, allowed = true }
 233                                         module:fire_event("user-registering", user);
 234                                         if not user.allowed then
 235                                                 session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is forbidden."));
 236                                         elseif usermanager_user_exists(username, host) then
 237                                                 session.send(st.error_reply(stanza, "cancel", "conflict", "The requested username already exists."));
 238                                         else
 239                                                 -- TODO unable to write file, file may be locked, etc, what's the correct error?
 240                                                 local error_reply = st.error_reply(stanza, "wait", "internal-server-error", "Failed to write data to disk.");
 241                                                 if usermanager_create_user(username, password, host) then
 242                                                         if next(data) and not account_details:set(username, data) then
 243                                                                 usermanager_delete_user(username, host);
 244                                                                 session.send(error_reply);
 245                                                                 return true;
 246                                                         end
 247                                                         session.send(st.reply(stanza)); -- user created!
 248                                                         log("info", "User account created: %s@%s", username, host);
 249                                                         module:fire_event("user-registered", {
 250                                                                 username = username, host = host, source = "mod_register",
 251                                                                 session = session });
 252                                                 else
 253                                                         session.send(error_reply);
 254                                                 end
 255                                         end
 256                                 end
 257                         end
 258                 end
 259         end
 260         return true;
 261 end);