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/* Module for providing Argon2 hashing
*
* (C) 2003-2024 Anope Team
* Contact us at team@anope.org
*
* This program is free but copyrighted software; see the file COPYING for
* details.
*
*/
/* RequiredLibraries: argon2 */
/* RequiredWindowsLibraries: argon2 */
#include <climits>
#include <random>
#include <argon2.h>
#include "module.h"
#include "modules/encryption.h"
class Argon2Context final
: public Encryption::Context
{
private:
Anope::string buffer;
argon2_type type;
Anope::string GenerateSalt()
{
static std::random_device device;
static std::mt19937 engine(device());
static std::uniform_int_distribution<int> dist(CHAR_MIN, CHAR_MAX);
Anope::string saltbuf(this->salt_length, ' ');
for (size_t i = 0; i < this->salt_length; ++i)
saltbuf[i] = static_cast<char>(dist(engine));
return saltbuf;
}
public:
static uint32_t memory_cost;
static uint32_t time_cost;
static uint32_t parallelism;
static uint32_t hash_length;
static uint32_t salt_length;
Argon2Context(argon2_type at)
: type(at)
{
}
void Update(const unsigned char *data, size_t len) override
{
buffer.append(reinterpret_cast<const char *>(data), len);
}
Anope::string Finalize() override
{
auto salt = GenerateSalt();
// Calculate the size of and allocate the output buffer.
auto length = argon2_encodedlen(this->time_cost, this->memory_cost, this->parallelism,
this->salt_length, this->hash_length, this->type);
std::vector<char> digest(length);
auto result = argon2_hash(this->time_cost, this->memory_cost, this->parallelism,
buffer.c_str(), buffer.length(), salt.c_str(), salt.length(), nullptr,
this->hash_length, digest.data(), digest.size(), this->type,
ARGON2_VERSION_NUMBER);
if (result == ARGON2_OK)
return Anope::string(digest.data(), digest.size());
Log(LOG_DEBUG_2) << "Argon2 error: " << argon2_error_message(result);
return {};
}
};
uint32_t Argon2Context::memory_cost;
uint32_t Argon2Context::time_cost;
uint32_t Argon2Context::parallelism;
uint32_t Argon2Context::hash_length;
uint32_t Argon2Context::salt_length;
class Argon2Provider final
: public Encryption::Provider
{
private:
argon2_type type;
public:
Argon2Provider(Module *creator, argon2_type at)
: Encryption::Provider(creator, argon2_type2string(at, 0), 0, 0)
, type(at)
{
}
bool Compare(const Anope::string &hash, const Anope::string &plain) override
{
return argon2_verify(hash.c_str(), plain.c_str(), plain.length(), this->type) == ARGON2_OK;
}
std::unique_ptr<Encryption::Context> CreateContext() override
{
return std::make_unique<Argon2Context>(this->type);
}
Anope::string ToPrintable(const Anope::string &hash) override
{
// We have no way to make this printable without the creating context
// so we always return the printed form.
return hash;
}
};
class EArgon2 final
: public Module
{
private:
Encryption::Provider *defaultprovider = nullptr;
Argon2Provider argon2dprovider;
Argon2Provider argon2iprovider;
Argon2Provider argon2idprovider;
Encryption::Provider *GetAlgorithm(const Anope::string &algorithm)
{
if (algorithm == "argon2d")
return &argon2dprovider;
if (algorithm == "argon2i")
return &argon2iprovider;
if (algorithm == "argon2id")
return &argon2idprovider;
return nullptr;
}
public:
EArgon2(const Anope::string &modname, const Anope::string &creator)
: Module(modname, creator, ENCRYPTION | VENDOR)
, argon2dprovider(this, Argon2_d)
, argon2iprovider(this, Argon2_i)
, argon2idprovider(this, Argon2_id)
{
}
void OnReload(Configuration::Conf *conf) override
{
const auto *block = Config->GetModule(this);
this->defaultprovider = GetAlgorithm(block->Get<const Anope::string>("algorithm", "argon2id"));
Argon2Context::memory_cost = block->Get<uint32_t>("memory_cost", "131072");
Argon2Context::time_cost = block->Get<uint32_t>("time_cost", "3");
Argon2Context::parallelism = block->Get<uint32_t>("parallelism", "1");
Argon2Context::hash_length = block->Get<uint32_t>("hash_length", "32");
Argon2Context::salt_length = block->Get<uint32_t>("salt_length", "32");
}
EventReturn OnEncrypt(const Anope::string &src, Anope::string &dest) override
{
if (!defaultprovider)
return EVENT_CONTINUE;
auto hash = defaultprovider->Encrypt(src);
auto enc = defaultprovider->name + ":" + hash;
Log(LOG_DEBUG_2) << "(enc_argon2) hashed password from [" << src << "] to [" << enc << "]";
dest = enc;
return EVENT_ALLOW;
}
void OnCheckAuthentication(User *, IdentifyRequest *req) override
{
const auto *na = NickAlias::Find(req->GetAccount());
if (!na)
return;
NickCore *nc = na->nc;
auto pos = nc->pass.find(':');
if (pos == Anope::string::npos)
return;
Anope::string hash_method(nc->pass.begin(), nc->pass.begin() + pos);
auto provider = GetAlgorithm(hash_method);
if (!provider)
return; // Not a hash for this module.
Anope::string hash_value(nc->pass.begin() + pos + 1, nc->pass.end());
if (provider->Compare(hash_value, req->GetPassword()))
{
// If we are NOT the first encryption module or the algorithm is
// different we want to re-encrypt the password with the primary
// encryption method.
if (ModuleManager::FindFirstOf(ENCRYPTION) != this || provider != defaultprovider)
Anope::Encrypt(req->GetPassword(), nc->pass);
req->Success(this);
}
}
};
MODULE_INIT(EArgon2)
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