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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2020 Matt Schatz <genius3000@g3k.solutions>
* Copyright (C) 2013, 2017-2021 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013 Shawn Smith <ShawnSmith0828@gmail.com>
* Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006-2007 Craig Edwards <brain@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "modules/ctctags.h"
#include "modules/extban.h"
#include "modules/ssl.h"
#include "numerichelper.h"
enum
{
// From UnrealIRCd.
ERR_SECUREONLYCHAN = 489,
// InspIRCd-specific.
ERR_ALLMUSTSSL = 490
};
class SSLFPExtBan final
: public ExtBan::MatchingBase
{
private:
UserCertificateAPI& sslapi;
public:
SSLFPExtBan(Module* Creator, UserCertificateAPI& api)
: ExtBan::MatchingBase(Creator, "sslfp", 'z')
, sslapi(api)
{
}
bool IsMatch(User* user, Channel* channel, const std::string& text) override
{
const std::string fp = sslapi ? sslapi->GetFingerprint(user) : "";
return !fp.empty() && InspIRCd::Match(fp, text);
}
};
/** Handle channel mode +z
*/
class SSLMode final
: public ModeHandler
{
private:
UserCertificateAPI& API;
public:
SSLMode(Module* Creator, UserCertificateAPI& api)
: ModeHandler(Creator, "sslonly", 'z', PARAM_NONE, MODETYPE_CHANNEL)
, API(api)
{
}
bool OnModeChange(User* source, User* dest, Channel* channel, Modes::Change& change) override
{
if (change.adding)
{
if (!channel->IsModeSet(this))
{
if (IS_LOCAL(source))
{
if (!API)
{
source->WriteNumeric(ERR_ALLMUSTSSL, channel->name, "Unable to determine whether all members of the channel are connected via TLS");
return false;
}
size_t nonssl = 0;
for (const auto& [u, _] : channel->GetUsers())
{
if (!API->IsSecure(u) && !u->server->IsService())
nonssl++;
}
if (nonssl)
{
source->WriteNumeric(ERR_ALLMUSTSSL, channel->name, INSP_FORMAT("All members of the channel must be connected via TLS ({}/{} are non-TLS)",
nonssl, channel->GetUsers().size()));
return false;
}
}
channel->SetMode(this, true);
return true;
}
else
{
return false;
}
}
else
{
if (channel->IsModeSet(this))
{
channel->SetMode(this, false);
return true;
}
return false;
}
}
};
/** Handle user mode +z
*/
class SSLModeUser final
: public ModeHandler
{
private:
UserCertificateAPI& API;
public:
SSLModeUser(Module* Creator, UserCertificateAPI& api)
: ModeHandler(Creator, "sslqueries", 'z', PARAM_NONE, MODETYPE_USER)
, API(api)
{
}
bool OnModeChange(User* user, User* dest, Channel* channel, Modes::Change& change) override
{
if (change.adding == dest->IsModeSet(this))
return false;
if (change.adding && IS_LOCAL(user) && (!API || !API->IsSecure(user)))
return false;
dest->SetMode(this, change.adding);
return true;
}
};
class ModuleSSLModes final
: public Module
, public CTCTags::EventListener
{
private:
UserCertificateAPI api;
SSLMode sslm;
SSLModeUser sslquery;
SSLFPExtBan sslfp;
public:
ModuleSSLModes()
: Module(VF_VENDOR, "Adds channel mode z (sslonly) which prevents users who are not connecting using TLS from joining the channel and user mode z (sslqueries) to prevent messages from non-TLS users.")
, CTCTags::EventListener(this)
, api(this)
, sslm(this, api)
, sslquery(this, api)
, sslfp(this, api)
{
}
ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven, bool override) override
{
if (!override && chan && chan->IsModeSet(sslm))
{
if (!api)
{
user->WriteNumeric(ERR_SECUREONLYCHAN, cname, "Cannot join channel; unable to determine if you are a TLS user (+z is set)");
return MOD_RES_DENY;
}
if (!api->IsSecure(user))
{
user->WriteNumeric(ERR_SECUREONLYCHAN, cname, "Cannot join channel; TLS users only (+z is set)");
return MOD_RES_DENY;
}
}
return MOD_RES_PASSTHRU;
}
ModResult HandleMessage(User* user, const MessageTarget& msgtarget)
{
if (msgtarget.type != MessageTarget::TYPE_USER)
return MOD_RES_PASSTHRU;
User* target = msgtarget.Get<User>();
/* If one or more of the parties involved is a services user, we won't stop it. */
if (user->server->IsService() || target->server->IsService())
return MOD_RES_PASSTHRU;
/* If the target is +z */
if (target->IsModeSet(sslquery))
{
if (!api || !api->IsSecure(user))
{
/* The sending user is not on an TLS connection */
user->WriteNumeric(Numerics::CannotSendTo(target, "messages", &sslquery));
return MOD_RES_DENY;
}
}
/* If the user is +z */
else if (user->IsModeSet(sslquery))
{
if (!api || !api->IsSecure(target))
{
user->WriteNumeric(Numerics::CannotSendTo(target, "messages", &sslquery, true));
return MOD_RES_DENY;
}
}
return MOD_RES_PASSTHRU;
}
ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) override
{
return HandleMessage(user, target);
}
ModResult OnUserPreTagMessage(User* user, const MessageTarget& target, CTCTags::TagMessageDetails& details) override
{
return HandleMessage(user, target);
}
};
MODULE_INIT(ModuleSSLModes)
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