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/**
* Copyright (C) 2022-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/crypto/jws_validator.h"
#include "mongo/crypto/jwt_types_gen.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/net/ssl_manager.h"
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000fL)
namespace {
// Copies of OpenSSL 1.1.0 and later define new EVP digest routines. We must
// polyfill used definitions to interact with older OpenSSL versions.
EVP_MD_CTX* EVP_MD_CTX_new() {
return EVP_MD_CTX_create();
}
void EVP_MD_CTX_free(EVP_MD_CTX* ctx) {
EVP_MD_CTX_destroy(ctx);
}
int RSA_set0_key(RSA* r, BIGNUM* n, BIGNUM* e, BIGNUM* d) {
/* If the fields n and e in r are NULL, the corresponding input
* parameters MUST be non-NULL for n and e. d may be
* left NULL (in case only the public key is used).
*/
if ((r->n == NULL && n == NULL) || (r->e == NULL && e == NULL))
return 0;
if (n != NULL) {
BN_free(r->n);
r->n = n;
}
if (e != NULL) {
BN_free(r->e);
r->e = e;
}
if (d != NULL) {
BN_free(r->d);
r->d = d;
}
return 1;
}
} // namespace
#endif
namespace mongo::crypto {
namespace {
using UniqueRSA = std::unique_ptr<RSA, OpenSSLDeleter<decltype(RSA_free), RSA_free>>;
using UniqueEVPPKey =
std::unique_ptr<EVP_PKEY, OpenSSLDeleter<decltype(EVP_PKEY_free), EVP_PKEY_free>>;
using UniqueEVPMDCtx =
std::unique_ptr<EVP_MD_CTX, OpenSSLDeleter<decltype(EVP_MD_CTX_free), ::EVP_MD_CTX_free>>;
using UniqueBIGNUM = std::unique_ptr<BIGNUM, OpenSSLDeleter<decltype(BN_free), BN_free>>;
class JWSValidatorOpenSSLRSA : public JWSValidator {
public:
JWSValidatorOpenSSLRSA(StringData algorithm, const BSONObj& key) : _key(EVP_PKEY_new()) {
uassert(7095402, "Unknown hashing algorithm", algorithm == "RSA");
auto RSAKey = JWKRSA::parse(IDLParserContext("JWKRSA"), key);
const auto* pubKeyNData =
reinterpret_cast<const unsigned char*>(RSAKey.getModulus().rawData());
UniqueBIGNUM n(BN_bin2bn(pubKeyNData, RSAKey.getModulus().size(), nullptr));
uassertOpenSSL("Failed creating modulus", n.get() != nullptr);
const auto* pubKeyEData =
reinterpret_cast<const unsigned char*>(RSAKey.getPublicExponent().rawData());
UniqueBIGNUM e(BN_bin2bn(pubKeyEData, RSAKey.getPublicExponent().size(), nullptr));
uassertOpenSSL("Failed creating exponent", e.get() != nullptr);
UniqueRSA rsa(RSA_new());
uassertOpenSSL("Failed creating RSAKey", rsa.get() != nullptr);
uassertOpenSSL("RSA key setup failed",
RSA_set0_key(rsa.get(), n.get(), e.get(), nullptr) == 1);
n.release(); // Now owned by rsa
e.release(); // Now owned by rsa
uassertOpenSSL("Failed creating EVP_PKey", _key.get() != nullptr);
uassertOpenSSL("EVP_PKEY assignment failed",
EVP_PKEY_assign_RSA(_key.get(), rsa.get()) == 1);
rsa.release(); // Now owned by _key
}
Status validate(StringData algorithm, StringData payload, StringData signature) const final {
const EVP_MD* alg = getHashingAlg(algorithm);
uassert(7095403, str::stream() << "Unknown hashing algorithm: '" << algorithm << "'", alg);
UniqueEVPMDCtx ctx(EVP_MD_CTX_new());
uassertOpenSSL("DigestVerifyInit failed",
EVP_DigestVerifyInit(ctx.get(), nullptr, alg, nullptr, _key.get()) == 1);
uassertOpenSSL(
"DigestVerifyUpdate failed",
EVP_DigestVerifyUpdate(ctx.get(),
reinterpret_cast<const unsigned char*>(payload.rawData()),
payload.size()) == 1);
int verifyRes = EVP_DigestVerifyFinal(
ctx.get(),
const_cast<unsigned char*>(reinterpret_cast<const unsigned char*>(signature.rawData())),
signature.size());
if (verifyRes == 0) {
return {ErrorCodes::InvalidSignature, "OpenSSL: Signature is invalid"};
} else if (verifyRes != 1) {
return {ErrorCodes::UnknownError,
SSLManagerInterface::getSSLErrorMessage(ERR_get_error())};
}
return Status::OK();
}
private:
static constexpr auto kRS256 = "RS256"_sd;
static constexpr auto kRS384 = "RS384"_sd;
static constexpr auto kRS512 = "RS512"_sd;
static const EVP_MD* getHashingAlg(StringData alg) {
if (alg == kRS256) {
return EVP_sha256();
}
if (alg == kRS384) {
return EVP_sha384();
}
if (alg == kRS512) {
return EVP_sha512();
}
return nullptr;
}
static void uassertOpenSSL(StringData context, bool success) {
uassert(ErrorCodes::OperationFailed,
str::stream() << context << ": "
<< SSLManagerInterface::getSSLErrorMessage(ERR_get_error()),
success);
}
UniqueEVPPKey _key;
};
} // namespace
StatusWith<std::unique_ptr<JWSValidator>> JWSValidator::create(StringData algorithm,
const BSONObj& key) try {
return std::make_unique<JWSValidatorOpenSSLRSA>(algorithm, key);
} catch (const DBException& e) {
return e.toStatus();
}
} // namespace mongo::crypto
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