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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2023 Sadie Powell <sadie@witchery.services>
*
* 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/account.h"
#include "modules/cloak.h"
class UserMethod
: public Cloak::Method
{
protected:
// The characters which are valid in a hostname.
const CharState& hostmap;
// The prefix for cloaks (e.g. users.).
const std::string prefix;
// Whether to strip non-host characters from the cloak.
const bool sanitize;
// The suffix for IP cloaks (e.g. .example.org).
const std::string suffix;
UserMethod(const Cloak::Engine* engine, const std::shared_ptr<ConfigTag>& tag, const CharState& hm) ATTR_NOT_NULL(2)
: Cloak::Method(engine, tag)
, hostmap(hm)
, prefix(tag->getString("prefix"))
, sanitize(tag->getBool("sanitize", true))
, suffix(tag->getString("suffix"))
{
}
// Retrieves the middle segment of the cloak.
virtual std::string GetMiddle(LocalUser* user) = 0;
public:
std::string Generate(LocalUser* user) override ATTR_NOT_NULL(2)
{
if (!MatchesUser(user))
return {}; // We shouldn't cloak this user.
const std::string middle = GetMiddle(user);
if (middle.empty())
return {}; // No middle cloak.
std::string safemiddle;
safemiddle.reserve(middle.length());
for (const auto chr : middle)
{
if (!hostmap.test(static_cast<unsigned char>(chr)))
{
if (!sanitize)
return {}; // Contains invalid characters.
continue;
}
safemiddle.push_back(chr);
}
if (safemiddle.empty())
return {}; // No cloak.
return prefix + safemiddle + suffix;
}
std::string Generate(const std::string& hostip) override
{
// We can't generate account cloaks without a user.
return {};
}
void GetLinkData(Module::LinkData& data, std::string& compatdata) override
{
data["prefix"] = prefix;
data["sanitize"] = sanitize ? "yes" : "no";
data["suffix"] = suffix;
}
};
class AccountMethod final
: public UserMethod
{
private:
// Dynamic reference to the account api.
Account::API accountapi;
// Retrieves the middle segment of the cloak.
std::string GetMiddle(LocalUser* user) override
{
const std::string* accountname = accountapi ? accountapi->GetAccountName(user) : nullptr;
return accountname ? *accountname : "";
}
public:
AccountMethod(const Cloak::Engine* engine, const std::shared_ptr<ConfigTag>& tag, const CharState& hm) ATTR_NOT_NULL(2)
: UserMethod(engine, tag, hm)
, accountapi(engine->creator)
{
}
};
class AccountIdMethod final
: public UserMethod
{
private:
// Dynamic reference to the account api.
Account::API accountapi;
// Retrieves the middle segment of the cloak.
std::string GetMiddle(LocalUser* user) override
{
const std::string* accountid = accountapi ? accountapi->GetAccountId(user) : nullptr;
return accountid ? *accountid : "";
}
public:
AccountIdMethod(const Cloak::Engine* engine, const std::shared_ptr<ConfigTag>& tag, const CharState& hm) ATTR_NOT_NULL(2)
: UserMethod(engine, tag, hm)
, accountapi(engine->creator)
{
}
};
class NickMethod final
: public UserMethod
{
private:
// Retrieves the middle segment of the cloak.
std::string GetMiddle(LocalUser* user) override
{
return user->nick;
}
public:
NickMethod(const Cloak::Engine* engine, const std::shared_ptr<ConfigTag>& tag, const CharState& hm) ATTR_NOT_NULL(2)
: UserMethod(engine, tag, hm)
{
}
};
template <typename Method>
class UserEngine final
: public Cloak::Engine
{
private:
// The characters which are valid in a hostname.
const CharState& hostmap;
public:
UserEngine(Module* Creator, const std::string& Name, const CharState& hm)
: Cloak::Engine(Creator, Name)
, hostmap(hm)
{
}
Cloak::MethodPtr Create(const std::shared_ptr<ConfigTag>& tag, bool primary) override
{
return std::make_shared<Method>(this, tag, hostmap);
}
};
class ModuleCloakUser final
: public Module
, public Account::EventListener
{
private:
UserEngine<AccountMethod> accountcloak;
UserEngine<AccountIdMethod> accountidcloak;
UserEngine<NickMethod> nickcloak;
Cloak::API cloakapi;
CharState hostmap;
public:
ModuleCloakUser()
: Module(VF_VENDOR, "Adds the account, account-id, nick cloaking methods for use with the cloak module.")
, Account::EventListener(this)
, accountcloak(this, "account", hostmap)
, accountidcloak(this, "account-id", hostmap)
, nickcloak(this, "nick", hostmap)
, cloakapi(this)
{
}
void ReadConfig(ConfigStatus& status) override
{
CharState newhostmap;
const auto& tag = ServerInstance->Config->ConfValue("hostname");
for (const auto chr : tag->getString("charmap", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.-_/0123456789", 1))
{
// A hostname can not contain NUL, LF, CR, or SPACE.
if (chr == 0x00 || chr == 0x0A || chr == 0x0D || chr == 0x20)
throw ModuleException(this, INSP_FORMAT("<hostname:charmap> can not contain character 0x{:02X} ({})", chr, chr));
newhostmap.set(static_cast<unsigned char>(chr));
}
std::swap(newhostmap, hostmap);
}
void OnAccountChange(User* user, const std::string& newaccount) override
{
LocalUser* luser = IS_LOCAL(user);
if (!luser || !cloakapi)
return;
if (cloakapi->IsActiveCloak(accountcloak) || cloakapi->IsActiveCloak(accountidcloak))
cloakapi->ResetCloaks(luser, true);
}
void OnUserPostNick(User* user, const std::string& oldnick) override
{
LocalUser* luser = IS_LOCAL(user);
if (luser && cloakapi && cloakapi->IsActiveCloak(nickcloak))
cloakapi->ResetCloaks(luser, true);
}
};
MODULE_INIT(ModuleCloakUser)
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