src/modules/m_sslmodes.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2020 Matt Schatz <genius3000@g3k.solutions>
   5  *   Copyright (C) 2013, 2017-2020 Sadie Powell <sadie@witchery.services>
   6  *   Copyright (C) 2013 Shawn Smith <ShawnSmith0828@gmail.com>
   7  *   Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
   8  *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
   9  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
  10  *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
  11  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
  12  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  13  *   Copyright (C) 2006-2007, 2010 Craig Edwards <brain@inspircd.org>
  14  *
  15  * This file is part of InspIRCd.  InspIRCd is free software: you can
  16  * redistribute it and/or modify it under the terms of the GNU General Public
  17  * License as published by the Free Software Foundation, version 2.
  18  *
  19  * This program is distributed in the hope that it will be useful, but WITHOUT
  20  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  21  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  22  * details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28
  29 #include "inspircd.h"
  30 #include "modules/ctctags.h"
  31 #include "modules/ssl.h"
  32
  33 enum
  34 {
  35         // From UnrealIRCd.
  36         ERR_SECUREONLYCHAN = 489,
  37         ERR_ALLMUSTSSL = 490
  38 };
  39
  40 /** Handle channel mode +z
  41  */
  42 class SSLMode : public ModeHandler
  43 {
  44  private:
  45         UserCertificateAPI& API;
  46
  47  public:
  48         SSLMode(Module* Creator, UserCertificateAPI& api)
  49                 : ModeHandler(Creator, "sslonly", 'z', PARAM_NONE, MODETYPE_CHANNEL)
  50                 , API(api)
  51         {
  52         }
  53
  54         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string& parameter, bool adding) CXX11_OVERRIDE
  55         {
  56                 if (adding)
  57                 {
  58                         if (!channel->IsModeSet(this))
  59                         {
  60                                 if (IS_LOCAL(source))
  61                                 {
  62                                         if (!API)
  63                                         {
  64                                                 source->WriteNumeric(ERR_ALLMUSTSSL, channel->name, "Unable to determine whether all members of the channel are connected via TLS (SSL)");
  65                                                 return MODEACTION_DENY;
  66                                         }
  67
  68                                         unsigned long nonssl = 0;
  69                                         const Channel::MemberMap& userlist = channel->GetUsers();
  70                                         for (Channel::MemberMap::const_iterator i = userlist.begin(); i != userlist.end(); ++i)
  71                                         {
  72                                                 ssl_cert* cert = API->GetCertificate(i->first);
  73                                                 if (!cert && !i->first->server->IsULine())
  74                                                         nonssl++;
  75                                         }
  76
  77                                         if (nonssl)
  78                                         {
  79                                                 source->WriteNumeric(ERR_ALLMUSTSSL, channel->name, InspIRCd::Format("All members of the channel must be connected via TLS (SSL) (%lu/%lu are non-TLS (SSL))",
  80                                                         nonssl, static_cast<unsigned long>(userlist.size())));
  81                                                 return MODEACTION_DENY;
  82                                         }
  83                                 }
  84                                 channel->SetMode(this, true);
  85                                 return MODEACTION_ALLOW;
  86                         }
  87                         else
  88                         {
  89                                 return MODEACTION_DENY;
  90                         }
  91                 }
  92                 else
  93                 {
  94                         if (channel->IsModeSet(this))
  95                         {
  96                                 channel->SetMode(this, false);
  97                                 return MODEACTION_ALLOW;
  98                         }
  99
 100                         return MODEACTION_DENY;
 101                 }
 102         }
 103 };
 104
 105 /** Handle user mode +z
 106 */
 107 class SSLModeUser : public ModeHandler
 108 {
 109  private:
 110         UserCertificateAPI& API;
 111
 112  public:
 113         SSLModeUser(Module* Creator, UserCertificateAPI& api)
 114                 : ModeHandler(Creator, "sslqueries", 'z', PARAM_NONE, MODETYPE_USER)
 115                 , API(api)
 116         {
 117                 if (!ServerInstance->Config->ConfValue("sslmodes")->getBool("enableumode"))
 118                         DisableAutoRegister();
 119         }
 120
 121         ModeAction OnModeChange(User* user, User* dest, Channel* channel, std::string& parameter, bool adding) CXX11_OVERRIDE
 122         {
 123                 if (adding)
 124                 {
 125                         if (!dest->IsModeSet(this))
 126                         {
 127                                 if (!API || !API->GetCertificate(user))
 128                                         return MODEACTION_DENY;
 129
 130                                 dest->SetMode(this, true);
 131                                 return MODEACTION_ALLOW;
 132                         }
 133                 }
 134                 else
 135                 {
 136                         if (dest->IsModeSet(this))
 137                         {
 138                                 dest->SetMode(this, false);
 139                                 return MODEACTION_ALLOW;
 140                         }
 141                 }
 142
 143                 return MODEACTION_DENY;
 144         }
 145 };
 146
 147 class ModuleSSLModes
 148         : public Module
 149         , public CTCTags::EventListener
 150 {
 151  private:
 152         UserCertificateAPI api;
 153         SSLMode sslm;
 154         SSLModeUser sslquery;
 155
 156  public:
 157         ModuleSSLModes()
 158                 : CTCTags::EventListener(this)
 159                 , api(this)
 160                 , sslm(this, api)
 161                 , sslquery(this, api)
 162         {
 163         }
 164
 165         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
 166         {
 167                 if(chan && chan->IsModeSet(sslm))
 168                 {
 169                         if (!api)
 170                         {
 171                                 user->WriteNumeric(ERR_SECUREONLYCHAN, cname, "Cannot join channel; unable to determine if you are a TLS (SSL) user (+z is set)");
 172                                 return MOD_RES_DENY;
 173                         }
 174
 175                         if (!api->GetCertificate(user))
 176                         {
 177                                 user->WriteNumeric(ERR_SECUREONLYCHAN, cname, "Cannot join channel; TLS (SSL) users only (+z is set)");
 178                                 return MOD_RES_DENY;
 179                         }
 180                 }
 181
 182                 return MOD_RES_PASSTHRU;
 183         }
 184
 185         ModResult HandleMessage(User* user, const MessageTarget& msgtarget)
 186         {
 187                 if (msgtarget.type != MessageTarget::TYPE_USER)
 188                         return MOD_RES_PASSTHRU;
 189
 190                 User* target = msgtarget.Get<User>();
 191
 192                 /* If one or more of the parties involved is a ulined service, we won't stop it. */
 193                 if (user->server->IsULine() || target->server->IsULine())
 194                         return MOD_RES_PASSTHRU;
 195
 196                 /* If the target is +z */
 197                 if (target->IsModeSet(sslquery))
 198                 {
 199                         if (!api || !api->GetCertificate(user))
 200                         {
 201                                 /* The sending user is not on an SSL connection */
 202                                 user->WriteNumeric(Numerics::CannotSendTo(target, "messages", &sslquery));
 203                                 return MOD_RES_DENY;
 204                         }
 205                 }
 206                 /* If the user is +z */
 207                 else if (user->IsModeSet(sslquery))
 208                 {
 209                         if (!api || !api->GetCertificate(target))
 210                         {
 211                                 user->WriteNumeric(Numerics::CannotSendTo(target, "messages", &sslquery, true));
 212                                 return MOD_RES_DENY;
 213                         }
 214                 }
 215
 216                 return MOD_RES_PASSTHRU;
 217         }
 218
 219         ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
 220         {
 221                 return HandleMessage(user, target);
 222         }
 223
 224         ModResult OnUserPreTagMessage(User* user, const MessageTarget& target, CTCTags::TagMessageDetails& details) CXX11_OVERRIDE
 225         {
 226                 return HandleMessage(user, target);
 227         }
 228
 229         ModResult OnCheckBan(User *user, Channel *c, const std::string& mask) CXX11_OVERRIDE
 230         {
 231                 if ((mask.length() > 2) && (mask[0] == 'z') && (mask[1] == ':'))
 232                 {
 233                         const std::string fp = api ? api->GetFingerprint(user) : "";
 234                         if (!fp.empty() && InspIRCd::Match(fp, mask.substr(2)))
 235                                 return MOD_RES_DENY;
 236                 }
 237                 return MOD_RES_PASSTHRU;
 238         }
 239
 240         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
 241         {
 242                 tokens["EXTBAN"].push_back('z');
 243         }
 244
 245         Version GetVersion() CXX11_OVERRIDE
 246         {
 247                 return Version("Adds channel mode z (sslonly) which prevents users who are not connecting using TLS (SSL) from joining the channel and user mode z (sslqueries) to prevent messages from non-TLS (SSL) users.", VF_VENDOR);
 248         }
 249 };
 250
 251 MODULE_INIT(ModuleSSLModes)