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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2025 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/>.
*/
/// BEGIN CMAKE
/// target_link_libraries(${TARGET} PRIVATE "vendored_bcrypt")
/// END CMAKE
#include "inspircd.h"
#include "modules/hash.h"
extern "C"
{
#include <bcrypt/crypt_blowfish.h>
}
class BCryptContext final
: public Hash::Context
{
private:
std::string buffer;
std::string GenerateSalt()
{
char entropy[16];
ServerInstance->GenRandom(entropy, std::size(entropy));
char salt[32];
if (!_crypt_gensalt_blowfish_rn("$2a$", rounds, entropy, sizeof(entropy), salt, sizeof(salt)))
{
ServerInstance->Logs.Debug("HASH", "Unable to generate a bcrypt salt: {}", strerror(errno));
return {};
}
return salt;
}
public:
static unsigned long rounds;
static std::string Hash(const std::string& data, const std::string& salt)
{
char hash[64];
if (!_crypt_blowfish_rn(data.c_str(), salt.c_str(), hash, sizeof(hash)))
{
ServerInstance->Logs.Debug("HASH", "Unable to generate a bcrypt hash: {}", strerror(errno));
return {};
}
return hash;
}
void Update(const unsigned char* data, size_t len) override
{
buffer.append(reinterpret_cast<const char *>(data), len);
}
std::string Finalize() override
{
auto salt = GenerateSalt();
if (salt.empty())
return {};
return Hash(this->buffer, salt);
}
};
unsigned long BCryptContext::rounds = 10;
class BCryptProvider final
: public Hash::Provider
{
public:
BCryptProvider(const WeakModulePtr& mod)
: Hash::Provider(mod, "bcrypt", 60)
{
}
bool Compare(const std::string& hash, const std::string& plain) override
{
auto newhash = BCryptContext::Hash(plain, hash);
return !newhash.empty() && InspIRCd::TimingSafeCompare(hash, newhash);
}
std::unique_ptr<Hash::Context> CreateContext() override
{
return std::make_unique<BCryptContext>();
}
std::string ToPrintable(const std::string& hash) override
{
// The crypt_blowfish library does not expose a raw form.
return hash;
}
};
class ModuleHashBCrypt final
: public Module
{
private:
BCryptProvider bcryptalgo;
public:
ModuleHashBCrypt()
: Module(VF_VENDOR, "Allows other modules to generate bcrypt hashes.")
, bcryptalgo(weak_from_this())
{
}
void init() override
{
bcryptalgo.Check({
{ "$2a$10$c9lUAuJmTYXEfNuLOiyIp.lZTMM.Rw5qsSAyZhvGT9EC3JevkUuOu", "" },
{ "$2a$10$YV4jDSGs0ZtQbpL6IHtNO.lt5Q.uzghIohCcnERQVBGyw7QJMfyhe", "The quick brown fox jumps over the lazy dog" },
});
}
void ReadConfig(ConfigStatus& status) override
{
const auto& conf = ServerInstance->Config->ConfValue("bcrypt");
BCryptContext::rounds = conf->getNum<unsigned long>("rounds", 10, 1);
}
};
MODULE_INIT(ModuleHashBCrypt)
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