src/modules/m_sslmodes.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2013, 2017-2019 Sadie Powell <sadie@witchery.services>
   5  *   Copyright (C) 2013 Shawn Smith <ShawnSmith0828@gmail.com>
   6  *   Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
   7  *   Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
   8  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   9  *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
  10  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
  11  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  12  *   Copyright (C) 2006-2007, 2010 Craig Edwards <brain@inspircd.org>
  13  *
  14  * This file is part of InspIRCd.  InspIRCd is free software: you can
  15  * redistribute it and/or modify it under the terms of the GNU General Public
  16  * License as published by the Free Software Foundation, version 2.
  17  *
  18  * This program is distributed in the hope that it will be useful, but WITHOUT
  19  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  20  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  21  * details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25  */
  26
  27
  28 #include "inspircd.h"
  29 #include "modules/ctctags.h"
  30 #include "modules/ssl.h"
  31
  32 enum
  33 {
  34         // From UnrealIRCd.
  35         ERR_SECUREONLYCHAN = 489,
  36         ERR_ALLMUSTSSL = 490
  37 };
  38
  39 /** Handle channel mode +z
  40  */
  41 class SSLMode : public ModeHandler
  42 {
  43  private:
  44         UserCertificateAPI& API;
  45
  46  public:
  47         SSLMode(Module* Creator, UserCertificateAPI& api)
  48                 : ModeHandler(Creator, "sslonly", 'z', PARAM_NONE, MODETYPE_CHANNEL)
  49                 , API(api)
  50         {
  51         }
  52
  53         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string& parameter, bool adding) CXX11_OVERRIDE
  54         {
  55                 if (adding)
  56                 {
  57                         if (!channel->IsModeSet(this))
  58                         {
  59                                 if (IS_LOCAL(source))
  60                                 {
  61                                         if (!API)
  62                                         {
  63                                                 source->WriteNumeric(ERR_ALLMUSTSSL, channel->name, "Unable to determine whether all members of the channel are connected via SSL");
  64                                                 return MODEACTION_DENY;
  65                                         }
  66
  67                                         unsigned long nonssl = 0;
  68                                         const Channel::MemberMap& userlist = channel->GetUsers();
  69                                         for (Channel::MemberMap::const_iterator i = userlist.begin(); i != userlist.end(); ++i)
  70                                         {
  71                                                 ssl_cert* cert = API->GetCertificate(i->first);
  72                                                 if (!cert && !i->first->server->IsULine())
  73                                                         nonssl++;
  74                                         }
  75
  76                                         if (nonssl)
  77                                         {
  78                                                 source->WriteNumeric(ERR_ALLMUSTSSL, channel->name, InspIRCd::Format("All members of the channel must be connected via SSL (%lu/%lu are non-SSL)",
  79                                                         nonssl, static_cast<unsigned long>(userlist.size())));
  80                                                 return MODEACTION_DENY;
  81                                         }
  82                                 }
  83                                 channel->SetMode(this, true);
  84                                 return MODEACTION_ALLOW;
  85                         }
  86                         else
  87                         {
  88                                 return MODEACTION_DENY;
  89                         }
  90                 }
  91                 else
  92                 {
  93                         if (channel->IsModeSet(this))
  94                         {
  95                                 channel->SetMode(this, false);
  96                                 return MODEACTION_ALLOW;
  97                         }
  98
  99                         return MODEACTION_DENY;
 100                 }
 101         }
 102 };
 103
 104 /** Handle user mode +z
 105 */
 106 class SSLModeUser : public ModeHandler
 107 {
 108  private:
 109         UserCertificateAPI& API;
 110
 111  public:
 112         SSLModeUser(Module* Creator, UserCertificateAPI& api)
 113                 : ModeHandler(Creator, "sslqueries", 'z', PARAM_NONE, MODETYPE_USER)
 114                 , API(api)
 115         {
 116                 if (!ServerInstance->Config->ConfValue("sslmodes")->getBool("enableumode"))
 117                         DisableAutoRegister();
 118         }
 119
 120         ModeAction OnModeChange(User* user, User* dest, Channel* channel, std::string& parameter, bool adding) CXX11_OVERRIDE
 121         {
 122                 if (adding)
 123                 {
 124                         if (!dest->IsModeSet(this))
 125                         {
 126                                 if (!API || !API->GetCertificate(user))
 127                                         return MODEACTION_DENY;
 128
 129                                 dest->SetMode(this, true);
 130                                 return MODEACTION_ALLOW;
 131                         }
 132                 }
 133                 else
 134                 {
 135                         if (dest->IsModeSet(this))
 136                         {
 137                                 dest->SetMode(this, false);
 138                                 return MODEACTION_ALLOW;
 139                         }
 140                 }
 141
 142                 return MODEACTION_DENY;
 143         }
 144 };
 145
 146 class ModuleSSLModes
 147         : public Module
 148         , public CTCTags::EventListener
 149 {
 150  private:
 151         UserCertificateAPI api;
 152         SSLMode sslm;
 153         SSLModeUser sslquery;
 154
 155  public:
 156         ModuleSSLModes()
 157                 : CTCTags::EventListener(this)
 158                 , api(this)
 159                 , sslm(this, api)
 160                 , sslquery(this, api)
 161         {
 162         }
 163
 164         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
 165         {
 166                 if(chan && chan->IsModeSet(sslm))
 167                 {
 168                         if (!api)
 169                         {
 170                                 user->WriteNumeric(ERR_SECUREONLYCHAN, cname, "Cannot join channel; unable to determine if you are an SSL user (+z is set)");
 171                                 return MOD_RES_DENY;
 172                         }
 173
 174                         if (!api->GetCertificate(user))
 175                         {
 176                                 user->WriteNumeric(ERR_SECUREONLYCHAN, cname, "Cannot join channel; SSL users only (+z is set)");
 177                                 return MOD_RES_DENY;
 178                         }
 179                 }
 180
 181                 return MOD_RES_PASSTHRU;
 182         }
 183
 184         ModResult HandleMessage(User* user, const MessageTarget& msgtarget)
 185         {
 186                 if (msgtarget.type != MessageTarget::TYPE_USER)
 187                         return MOD_RES_PASSTHRU;
 188
 189                 User* target = msgtarget.Get<User>();
 190
 191                 /* If one or more of the parties involved is a ulined service, we wont stop it. */
 192                 if (user->server->IsULine() || target->server->IsULine())
 193                         return MOD_RES_PASSTHRU;
 194
 195                 /* If the target is +z */
 196                 if (target->IsModeSet(sslquery))
 197                 {
 198                         if (!api || !api->GetCertificate(user))
 199                         {
 200                                 /* The sending user is not on an SSL connection */
 201                                 user->WriteNumeric(Numerics::CannotSendTo(target, "messages", &sslquery));
 202                                 return MOD_RES_DENY;
 203                         }
 204                 }
 205                 /* If the user is +z */
 206                 else if (user->IsModeSet(sslquery))
 207                 {
 208                         if (!api || !api->GetCertificate(target))
 209                         {
 210                                 user->WriteNumeric(Numerics::CannotSendTo(target, "messages", &sslquery, true));
 211                                 return MOD_RES_DENY;
 212                         }
 213                 }
 214
 215                 return MOD_RES_PASSTHRU;
 216         }
 217
 218         ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
 219         {
 220                 return HandleMessage(user, target);
 221         }
 222
 223         ModResult OnUserPreTagMessage(User* user, const MessageTarget& target, CTCTags::TagMessageDetails& details) CXX11_OVERRIDE
 224         {
 225                 return HandleMessage(user, target);
 226         }
 227
 228         ModResult OnCheckBan(User *user, Channel *c, const std::string& mask) CXX11_OVERRIDE
 229         {
 230                 if ((mask.length() > 2) && (mask[0] == 'z') && (mask[1] == ':'))
 231                 {
 232                         const std::string fp = api ? api->GetFingerprint(user) : "";
 233                         if (!fp.empty() && InspIRCd::Match(fp, mask.substr(2)))
 234                                 return MOD_RES_DENY;
 235                 }
 236                 return MOD_RES_PASSTHRU;
 237         }
 238
 239         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
 240         {
 241                 tokens["EXTBAN"].push_back('z');
 242         }
 243
 244         Version GetVersion() CXX11_OVERRIDE
 245         {
 246                 return Version("Adds channel mode z (sslonly) which prevents users who are not connecting using SSL from joining the channel and user mode z (sslqueries) to prevent messages from non-SSL users.", VF_VENDOR);
 247         }
 248 };
 249
 250 MODULE_INIT(ModuleSSLModes)