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258 lines
8.5 KiB
C++
258 lines
8.5 KiB
C++
/*- *- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This code is made available to you under your choice of the following sets
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* of licensing terms:
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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/* Copyright 2013 Mozilla Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "pkix/pkixnss.h"
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#include <limits>
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#include "cert.h"
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#include "cryptohi.h"
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#include "keyhi.h"
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#include "pk11pub.h"
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#include "pkix/pkix.h"
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#include "pkix/ScopedPtr.h"
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#include "secerr.h"
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#include "sslerr.h"
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namespace mozilla { namespace pkix {
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typedef ScopedPtr<SECKEYPublicKey, SECKEY_DestroyPublicKey> ScopedSECKeyPublicKey;
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Result
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CheckPublicKeySize(Input subjectPublicKeyInfo, unsigned int minimumNonECCBits,
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/*out*/ ScopedSECKeyPublicKey& publicKey)
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{
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SECItem subjectPublicKeyInfoSECItem =
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UnsafeMapInputToSECItem(subjectPublicKeyInfo);
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ScopedPtr<CERTSubjectPublicKeyInfo, SECKEY_DestroySubjectPublicKeyInfo>
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spki(SECKEY_DecodeDERSubjectPublicKeyInfo(&subjectPublicKeyInfoSECItem));
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if (!spki) {
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return MapPRErrorCodeToResult(PR_GetError());
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}
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publicKey = SECKEY_ExtractPublicKey(spki.get());
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if (!publicKey) {
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return MapPRErrorCodeToResult(PR_GetError());
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}
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switch (publicKey.get()->keyType) {
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case ecKey:
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// TODO(bug 1077790): We should check which curve.
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return Success;
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case rsaKey:
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if (SECKEY_PublicKeyStrengthInBits(publicKey.get()) < minimumNonECCBits) {
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return Result::ERROR_INADEQUATE_KEY_SIZE;
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}
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break;
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case dsaKey: // fall through
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case nullKey: // fall through
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case fortezzaKey: // fall through
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case dhKey: // fall through
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case keaKey: // fall through
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case rsaPssKey: // fall through
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case rsaOaepKey: // fall through
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default:
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return Result::ERROR_UNSUPPORTED_KEYALG;
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}
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return Success;
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}
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Result
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CheckPublicKey(Input subjectPublicKeyInfo, unsigned int minimumNonECCBits)
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{
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ScopedSECKeyPublicKey unused;
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return CheckPublicKeySize(subjectPublicKeyInfo, minimumNonECCBits, unused);
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}
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Result
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VerifySignedData(const SignedDataWithSignature& sd,
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Input subjectPublicKeyInfo, unsigned int minimumNonECCBits,
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void* pkcs11PinArg)
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{
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SECOidTag pubKeyAlg;
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SECOidTag digestAlg;
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switch (sd.algorithm) {
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case SignatureAlgorithm::ecdsa_with_sha512:
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pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
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digestAlg = SEC_OID_SHA512;
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break;
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case SignatureAlgorithm::ecdsa_with_sha384:
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pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
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digestAlg = SEC_OID_SHA384;
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break;
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case SignatureAlgorithm::ecdsa_with_sha256:
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pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
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digestAlg = SEC_OID_SHA256;
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break;
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case SignatureAlgorithm::ecdsa_with_sha1:
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pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
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digestAlg = SEC_OID_SHA1;
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break;
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case SignatureAlgorithm::rsa_pkcs1_with_sha512:
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pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
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digestAlg = SEC_OID_SHA512;
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break;
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case SignatureAlgorithm::rsa_pkcs1_with_sha384:
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pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
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digestAlg = SEC_OID_SHA384;
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break;
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case SignatureAlgorithm::rsa_pkcs1_with_sha256:
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pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
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digestAlg = SEC_OID_SHA256;
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break;
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case SignatureAlgorithm::rsa_pkcs1_with_sha1:
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pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
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digestAlg = SEC_OID_SHA1;
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break;
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case SignatureAlgorithm::unsupported_algorithm:
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default:
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PR_NOT_REACHED("unknown signature algorithm");
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return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
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}
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Result rv;
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ScopedSECKeyPublicKey pubKey;
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rv = CheckPublicKeySize(subjectPublicKeyInfo, minimumNonECCBits, pubKey);
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if (rv != Success) {
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return rv;
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}
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// The static_cast is safe as long as the length of the data in sd.data can
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// fit in an int. Right now that length is stored as a uint16_t, so this
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// works. In the future this may change, hence the assertion.
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// See also bug 921585.
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static_assert(sizeof(decltype(sd.data.GetLength())) < sizeof(int),
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"sd.data.GetLength() must fit in an int");
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SECItem dataSECItem(UnsafeMapInputToSECItem(sd.data));
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SECItem signatureSECItem(UnsafeMapInputToSECItem(sd.signature));
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SECStatus srv = VFY_VerifyDataDirect(dataSECItem.data,
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static_cast<int>(dataSECItem.len),
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pubKey.get(), &signatureSECItem,
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pubKeyAlg, digestAlg, nullptr,
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pkcs11PinArg);
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if (srv != SECSuccess) {
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return MapPRErrorCodeToResult(PR_GetError());
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}
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return Success;
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}
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Result
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DigestBuf(Input item, /*out*/ uint8_t* digestBuf, size_t digestBufLen)
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{
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static_assert(TrustDomain::DIGEST_LENGTH == SHA1_LENGTH,
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"TrustDomain::DIGEST_LENGTH must be 20 (SHA-1 digest length)");
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if (digestBufLen != TrustDomain::DIGEST_LENGTH) {
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PR_NOT_REACHED("invalid hash length");
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return Result::FATAL_ERROR_INVALID_ARGS;
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}
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SECItem itemSECItem = UnsafeMapInputToSECItem(item);
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if (itemSECItem.len >
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static_cast<decltype(itemSECItem.len)>(
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std::numeric_limits<int32_t>::max())) {
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PR_NOT_REACHED("large items should not be possible here");
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return Result::FATAL_ERROR_INVALID_ARGS;
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}
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SECStatus srv = PK11_HashBuf(SEC_OID_SHA1, digestBuf, itemSECItem.data,
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static_cast<int32_t>(itemSECItem.len));
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if (srv != SECSuccess) {
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return MapPRErrorCodeToResult(PR_GetError());
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}
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return Success;
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}
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Result
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MapPRErrorCodeToResult(PRErrorCode error)
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{
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switch (error)
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{
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#define MOZILLA_PKIX_MAP(mozilla_pkix_result, value, nss_result) \
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case nss_result: return Result::mozilla_pkix_result;
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MOZILLA_PKIX_MAP_LIST
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#undef MOZILLA_PKIX_MAP
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default:
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return Result::ERROR_UNKNOWN_ERROR;
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}
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}
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PRErrorCode
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MapResultToPRErrorCode(Result result)
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{
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switch (result)
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{
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#define MOZILLA_PKIX_MAP(mozilla_pkix_result, value, nss_result) \
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case Result::mozilla_pkix_result: return nss_result;
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MOZILLA_PKIX_MAP_LIST
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#undef MOZILLA_PKIX_MAP
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default:
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PR_NOT_REACHED("Unknown error code in MapResultToPRErrorCode");
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return SEC_ERROR_LIBRARY_FAILURE;
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}
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}
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void
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RegisterErrorTable()
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{
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// Note that these error strings are not localizable.
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// When these strings change, update the localization information too.
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static const struct PRErrorMessage ErrorTableText[] = {
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{ "MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE",
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"The server uses key pinning (HPKP) but no trusted certificate chain "
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"could be constructed that matches the pinset. Key pinning violations "
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"cannot be overridden." },
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{ "MOZILLA_PKIX_ERROR_CA_CERT_USED_AS_END_ENTITY",
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"The server uses a certificate with a basic constraints extension "
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"identifying it as a certificate authority. For a properly-issued "
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"certificate, this should not be the case." },
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{ "MOZILLA_PKIX_ERROR_INADEQUATE_KEY_SIZE",
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"The server presented a certificate with a key size that is too small "
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"to establish a secure connection." },
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{ "MOZILLA_PKIX_ERROR_V1_CERT_USED_AS_CA",
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"An X.509 version 1 certificate that is not a trust anchor was used to "
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"issue the server's certificate. X.509 version 1 certificates are "
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"deprecated and should not be used to sign other certificates." },
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{ "MOZILLA_PKIX_ERROR_NO_RFC822NAME_MATCH",
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"The certificate is not valid for the given email address." },
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};
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// Note that these error strings are not localizable.
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// When these strings change, update the localization information too.
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static const struct PRErrorTable ErrorTable = {
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ErrorTableText,
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"pkixerrors",
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ERROR_BASE,
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PR_ARRAY_SIZE(ErrorTableText)
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};
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(void) PR_ErrorInstallTable(&ErrorTable);
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}
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} } // namespace mozilla::pkix
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