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#include <Access/Authentication.h>
#include <Access/AuthenticationData.h>
#include <Access/Credentials.h>
#include <Access/ExternalAuthenticators.h>
#include <Access/LDAPClient.h>
#include <Access/GSSAcceptor.h>
#include <Common/Exception.h>
#include <Poco/SHA1Engine.h>
#include <Common/typeid_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
}
namespace
{
using Digest = AuthenticationData::Digest;
using Util = AuthenticationData::Util;
bool checkPasswordPlainText(const String & password, const Digest & password_plaintext)
{
return (Util::stringToDigest(password) == password_plaintext);
}
bool checkPasswordDoubleSHA1(std::string_view password, const Digest & password_double_sha1)
{
return (Util::encodeDoubleSHA1(password) == password_double_sha1);
}
bool checkPasswordBcrypt(std::string_view password, const Digest & password_bcrypt)
{
return Util::checkPasswordBcrypt(password, password_bcrypt);
}
bool checkPasswordSHA256(std::string_view password, const Digest & password_sha256, const String & salt)
{
return Util::encodeSHA256(String(password).append(salt)) == password_sha256;
}
bool checkPasswordDoubleSHA1MySQL(std::string_view scramble, std::string_view scrambled_password, const Digest & password_double_sha1)
{
/// scrambled_password = SHA1(password) XOR SHA1(scramble <concat> SHA1(SHA1(password)))
constexpr size_t scramble_length = 20;
constexpr size_t sha1_size = Poco::SHA1Engine::DIGEST_SIZE;
if ((scramble.size() < scramble_length) || (scramble.size() > scramble_length + 1)
|| ((scramble.size() == scramble_length + 1) && (scramble[scramble_length] != 0))
|| (scrambled_password.size() != sha1_size) || (password_double_sha1.size() != sha1_size))
return false;
Poco::SHA1Engine engine;
engine.update(scramble.data(), scramble_length);
engine.update(password_double_sha1.data(), sha1_size);
const Poco::SHA1Engine::Digest & digest = engine.digest();
Poco::SHA1Engine::Digest calculated_password_sha1(sha1_size);
for (size_t i = 0; i < sha1_size; ++i)
calculated_password_sha1[i] = scrambled_password[i] ^ digest[i];
auto calculated_password_double_sha1 = Util::encodeSHA1(calculated_password_sha1);
return calculated_password_double_sha1 == password_double_sha1;
}
bool checkPasswordPlainTextMySQL(std::string_view scramble, std::string_view scrambled_password, const Digest & password_plaintext)
{
return checkPasswordDoubleSHA1MySQL(scramble, scrambled_password, Util::encodeDoubleSHA1(password_plaintext));
}
}
bool Authentication::areCredentialsValid(const Credentials & credentials, const AuthenticationData & auth_data, const ExternalAuthenticators & external_authenticators)
{
if (!credentials.isReady())
return false;
if (const auto * gss_acceptor_context = typeid_cast<const GSSAcceptorContext *>(&credentials))
{
switch (auth_data.getType())
{
case AuthenticationType::NO_PASSWORD:
case AuthenticationType::PLAINTEXT_PASSWORD:
case AuthenticationType::SHA256_PASSWORD:
case AuthenticationType::DOUBLE_SHA1_PASSWORD:
case AuthenticationType::BCRYPT_PASSWORD:
case AuthenticationType::LDAP:
throw Authentication::Require<BasicCredentials>("ClickHouse Basic Authentication");
case AuthenticationType::KERBEROS:
return external_authenticators.checkKerberosCredentials(auth_data.getKerberosRealm(), *gss_acceptor_context);
case AuthenticationType::SSL_CERTIFICATE:
throw Authentication::Require<BasicCredentials>("ClickHouse X.509 Authentication");
case AuthenticationType::MAX:
break;
}
}
if (const auto * mysql_credentials = typeid_cast<const MySQLNative41Credentials *>(&credentials))
{
switch (auth_data.getType())
{
case AuthenticationType::NO_PASSWORD:
return true; // N.B. even if the password is not empty!
case AuthenticationType::PLAINTEXT_PASSWORD:
return checkPasswordPlainTextMySQL(mysql_credentials->getScramble(), mysql_credentials->getScrambledPassword(), auth_data.getPasswordHashBinary());
case AuthenticationType::DOUBLE_SHA1_PASSWORD:
return checkPasswordDoubleSHA1MySQL(mysql_credentials->getScramble(), mysql_credentials->getScrambledPassword(), auth_data.getPasswordHashBinary());
case AuthenticationType::SHA256_PASSWORD:
case AuthenticationType::BCRYPT_PASSWORD:
case AuthenticationType::LDAP:
case AuthenticationType::KERBEROS:
throw Authentication::Require<BasicCredentials>("ClickHouse Basic Authentication");
case AuthenticationType::SSL_CERTIFICATE:
throw Authentication::Require<BasicCredentials>("ClickHouse X.509 Authentication");
case AuthenticationType::MAX:
break;
}
}
if (const auto * basic_credentials = typeid_cast<const BasicCredentials *>(&credentials))
{
switch (auth_data.getType())
{
case AuthenticationType::NO_PASSWORD:
return true; // N.B. even if the password is not empty!
case AuthenticationType::PLAINTEXT_PASSWORD:
return checkPasswordPlainText(basic_credentials->getPassword(), auth_data.getPasswordHashBinary());
case AuthenticationType::SHA256_PASSWORD:
return checkPasswordSHA256(basic_credentials->getPassword(), auth_data.getPasswordHashBinary(), auth_data.getSalt());
case AuthenticationType::DOUBLE_SHA1_PASSWORD:
return checkPasswordDoubleSHA1(basic_credentials->getPassword(), auth_data.getPasswordHashBinary());
case AuthenticationType::LDAP:
return external_authenticators.checkLDAPCredentials(auth_data.getLDAPServerName(), *basic_credentials);
case AuthenticationType::KERBEROS:
throw Authentication::Require<GSSAcceptorContext>(auth_data.getKerberosRealm());
case AuthenticationType::SSL_CERTIFICATE:
throw Authentication::Require<BasicCredentials>("ClickHouse X.509 Authentication");
case AuthenticationType::BCRYPT_PASSWORD:
return checkPasswordBcrypt(basic_credentials->getPassword(), auth_data.getPasswordHashBinary());
case AuthenticationType::MAX:
break;
}
}
if (const auto * ssl_certificate_credentials = typeid_cast<const SSLCertificateCredentials *>(&credentials))
{
switch (auth_data.getType())
{
case AuthenticationType::NO_PASSWORD:
case AuthenticationType::PLAINTEXT_PASSWORD:
case AuthenticationType::SHA256_PASSWORD:
case AuthenticationType::DOUBLE_SHA1_PASSWORD:
case AuthenticationType::BCRYPT_PASSWORD:
case AuthenticationType::LDAP:
throw Authentication::Require<BasicCredentials>("ClickHouse Basic Authentication");
case AuthenticationType::KERBEROS:
throw Authentication::Require<GSSAcceptorContext>(auth_data.getKerberosRealm());
case AuthenticationType::SSL_CERTIFICATE:
return auth_data.getSSLCertificateCommonNames().contains(ssl_certificate_credentials->getCommonName());
case AuthenticationType::MAX:
break;
}
}
if ([[maybe_unused]] const auto * always_allow_credentials = typeid_cast<const AlwaysAllowCredentials *>(&credentials))
return true;
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "areCredentialsValid(): authentication type {} not supported", toString(auth_data.getType()));
}
}
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