src/modules/m_jumpserver.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
   5  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   6  *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
   7  *
   8  * This file is part of InspIRCd.  InspIRCd is free software: you can
   9  * redistribute it and/or modify it under the terms of the GNU General Public
  10  * License as published by the Free Software Foundation, version 2.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  15  * details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21
  22 #include "inspircd.h"
  23 #include "modules/ssl.h"
  24
  25 enum
  26 {
  27         // From ircd-ratbox.
  28         RPL_REDIR = 10
  29 };
  30
  31 /** Handle /JUMPSERVER
  32  */
  33 class CommandJumpserver : public Command
  34 {
  35  public:
  36         bool redirect_new_users;
  37         std::string redirect_to;
  38         std::string reason;
  39         int port;
  40         int sslport;
  41
  42         CommandJumpserver(Module* Creator) : Command(Creator, "JUMPSERVER", 0, 4)
  43         {
  44                 flags_needed = 'o';
  45                 syntax = "[<server> <port>[:<sslport>] <+/-an> <reason>]";
  46                 port = 0;
  47                 sslport = 0;
  48                 redirect_new_users = false;
  49         }
  50
  51         CmdResult Handle(const std::vector<std::string>& parameters, User* user) CXX11_OVERRIDE
  52         {
  53                 int n_done = 0;
  54                 reason = (parameters.size() < 4) ? "Please use this server/port instead" : parameters[3];
  55                 bool redirect_all_immediately = false;
  56                 redirect_new_users = true;
  57                 bool direction = true;
  58                 std::string n_done_s;
  59
  60                 /* No parameters: jumpserver disabled */
  61                 if (parameters.empty())
  62                 {
  63                         if (port)
  64                                 user->WriteNotice("*** Disabled jumpserver (previously set to '" + redirect_to + ":" + ConvToStr(port) + "')");
  65                         else
  66                                 user->WriteNotice("*** Jumpserver was not enabled.");
  67
  68                         port = 0;
  69                         sslport = 0;
  70                         redirect_to.clear();
  71                         return CMD_SUCCESS;
  72                 }
  73
  74                 port = 0;
  75                 redirect_to.clear();
  76
  77                 if (parameters.size() >= 3)
  78                 {
  79                         for (std::string::const_iterator n = parameters[2].begin(); n != parameters[2].end(); ++n)
  80                         {
  81                                 switch (*n)
  82                                 {
  83                                         case '+':
  84                                                 direction = true;
  85                                         break;
  86                                         case '-':
  87                                                 direction = false;
  88                                         break;
  89                                         case 'a':
  90                                                 redirect_all_immediately = direction;
  91                                         break;
  92                                         case 'n':
  93                                                 redirect_new_users = direction;
  94                                         break;
  95                                         default:
  96                                                 user->WriteNotice("*** Invalid JUMPSERVER flag: " + ConvToStr(*n));
  97                                                 return CMD_FAILURE;
  98                                         break;
  99                                 }
 100                         }
 101
 102                         size_t delimpos = parameters[1].find(':');
 103                         port = ConvToInt(parameters[1].substr(0, delimpos ? delimpos : std::string::npos));
 104                         sslport = (delimpos == std::string::npos ? 0 : ConvToInt(parameters[1].substr(delimpos + 1)));
 105
 106                         if (parameters[1].find_first_not_of("0123456789:") != std::string::npos
 107                                 || parameters[1].rfind(':') != delimpos
 108                                 || port > 65535 || sslport > 65535)
 109                         {
 110                                 user->WriteNotice("*** Invalid port number");
 111                                 return CMD_FAILURE;
 112                         }
 113
 114                         if (redirect_all_immediately)
 115                         {
 116                                 /* Redirect everyone but the oper sending the command */
 117                                 const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
 118                                 for (UserManager::LocalList::const_iterator i = list.begin(); i != list.end(); )
 119                                 {
 120                                         // Quitting the user removes it from the list
 121                                         LocalUser* t = *i;
 122                                         ++i;
 123                                         if (!t->IsOper())
 124                                         {
 125                                                 t->WriteNumeric(RPL_REDIR, parameters[0], GetPort(t), "Please use this Server/Port instead");
 126                                                 ServerInstance->Users->QuitUser(t, reason);
 127                                                 n_done++;
 128                                         }
 129                                 }
 130                                 if (n_done)
 131                                 {
 132                                         n_done_s = ConvToStr(n_done);
 133                                 }
 134                         }
 135
 136                         if (redirect_new_users)
 137                                 redirect_to = parameters[0];
 138
 139                         user->WriteNotice("*** Set jumpserver to server '" + parameters[0] + "' port '" + (port ? ConvToStr(port) : "Auto") + ", SSL " + (sslport ? ConvToStr(sslport) : "Auto") + "', flags '+" +
 140                                 (redirect_all_immediately ? "a" : "") + (redirect_new_users ? "n'" : "'") +
 141                                 (n_done ? " (" + n_done_s + "user(s) redirected): " : ": ") + reason);
 142                 }
 143
 144                 return CMD_SUCCESS;
 145         }
 146
 147         int GetPort(LocalUser* user)
 148         {
 149                 int p = (SSLIOHook::IsSSL(&user->eh) ? sslport : port);
 150                 if (p == 0)
 151                         p = user->GetServerPort();
 152                 return p;
 153         }
 154 };
 155
 156 class ModuleJumpServer : public Module
 157 {
 158         CommandJumpserver js;
 159  public:
 160         ModuleJumpServer() : js(this)
 161         {
 162         }
 163
 164         ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE
 165         {
 166                 if (js.redirect_new_users)
 167                 {
 168                         int port = js.GetPort(user);
 169                         user->WriteNumeric(RPL_REDIR, js.redirect_to, port, "Please use this Server/Port instead");
 170                         ServerInstance->Users->QuitUser(user, js.reason);
 171                         return MOD_RES_DENY;
 172                 }
 173                 return MOD_RES_PASSTHRU;
 174         }
 175
 176         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 177         {
 178                 // Emergency way to unlock
 179                 if (!status.srcuser)
 180                         js.redirect_new_users = false;
 181         }
 182
 183         Version GetVersion() CXX11_OVERRIDE
 184         {
 185                 return Version("Provides support for the RPL_REDIR numeric and the /JUMPSERVER command.", VF_VENDOR);
 186         }
 187 };
 188
 189 MODULE_INIT(ModuleJumpServer)