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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This code is made available to you under your choice of the following sets
+ * of licensing terms:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+/* Copyright 2013 Mozilla Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef mozilla_pkix_pkixutil_h
+#define mozilla_pkix_pkixutil_h
+
+#include "mozpkix/pkixder.h"
+
+namespace mozilla {
+namespace pkix {
+
+// During path building and verification, we build a linked list of BackCerts
+// from the current cert toward the end-entity certificate. The linked list
+// is used to verify properties that aren't local to the current certificate
+// and/or the direct link between the current certificate and its issuer,
+// such as name constraints.
+//
+// Each BackCert contains pointers to all the given certificate's extensions
+// so that we can parse the extension block once and then process the
+// extensions in an order that may be different than they appear in the cert.
+class BackCert final {
+ public:
+ // certDER and childCert must be valid for the lifetime of BackCert.
+ BackCert(Input aCertDER, EndEntityOrCA aEndEntityOrCA,
+ const BackCert* aChildCert)
+ : der(aCertDER),
+ endEntityOrCA(aEndEntityOrCA),
+ childCert(aChildCert),
+ version(der::Version::Uninitialized) {}
+
+ Result Init();
+
+ const Input GetDER() const { return der; }
+ const der::SignedDataWithSignature& GetSignedData() const {
+ return signedData;
+ }
+
+ der::Version GetVersion() const { return version; }
+ const Input GetSerialNumber() const { return serialNumber; }
+ const Input GetSignature() const { return signature; }
+ const Input GetIssuer() const { return issuer; }
+ // XXX: "validity" is a horrible name for the structure that holds
+ // notBefore & notAfter, but that is the name used in RFC 5280 and we use the
+ // RFC 5280 names for everything.
+ const Input GetValidity() const { return validity; }
+ const Input GetSubject() const { return subject; }
+ const Input GetSubjectPublicKeyInfo() const { return subjectPublicKeyInfo; }
+ const Input* GetAuthorityInfoAccess() const {
+ return MaybeInput(authorityInfoAccess);
+ }
+ const Input* GetBasicConstraints() const {
+ return MaybeInput(basicConstraints);
+ }
+ const Input* GetCertificatePolicies() const {
+ return MaybeInput(certificatePolicies);
+ }
+ const Input* GetExtKeyUsage() const { return MaybeInput(extKeyUsage); }
+ const Input* GetKeyUsage() const { return MaybeInput(keyUsage); }
+ const Input* GetInhibitAnyPolicy() const {
+ return MaybeInput(inhibitAnyPolicy);
+ }
+ const Input* GetNameConstraints() const {
+ return MaybeInput(nameConstraints);
+ }
+ const Input* GetSubjectAltName() const { return MaybeInput(subjectAltName); }
+ const Input* GetRequiredTLSFeatures() const {
+ return MaybeInput(requiredTLSFeatures);
+ }
+ const Input* GetSignedCertificateTimestamps() const {
+ return MaybeInput(signedCertificateTimestamps);
+ }
+
+ private:
+ const Input der;
+
+ public:
+ const EndEntityOrCA endEntityOrCA;
+ BackCert const* const childCert;
+
+ private:
+ // When parsing certificates in BackCert::Init, we don't accept empty
+ // extensions. Consequently, we don't have to store a distinction between
+ // empty extensions and extensions that weren't included. However, when
+ // *processing* extensions, we distinguish between whether an extension was
+ // included or not based on whetehr the GetXXX function for the extension
+ // returns nullptr.
+ static inline const Input* MaybeInput(const Input& item) {
+ return item.GetLength() > 0 ? &item : nullptr;
+ }
+
+ der::SignedDataWithSignature signedData;
+
+ der::Version version;
+ Input serialNumber;
+ Input signature;
+ Input issuer;
+ // XXX: "validity" is a horrible name for the structure that holds
+ // notBefore & notAfter, but that is the name used in RFC 5280 and we use the
+ // RFC 5280 names for everything.
+ Input validity;
+ Input subject;
+ Input subjectPublicKeyInfo;
+
+ Input authorityInfoAccess;
+ Input basicConstraints;
+ Input certificatePolicies;
+ Input extKeyUsage;
+ Input inhibitAnyPolicy;
+ Input keyUsage;
+ Input nameConstraints;
+ Input subjectAltName;
+ Input criticalNetscapeCertificateType;
+ Input requiredTLSFeatures;
+ Input signedCertificateTimestamps; // RFC 6962 (Certificate Transparency)
+
+ Result RememberExtension(Reader& extnID, Input extnValue, bool critical,
+ /*out*/ bool& understood);
+
+ BackCert(const BackCert&) = delete;
+ void operator=(const BackCert&) = delete;
+};
+
+class NonOwningDERArray final : public DERArray {
+ public:
+ NonOwningDERArray() : numItems(0) {
+ // we don't need to initialize the items array because we always check
+ // numItems before accessing i.
+ }
+
+ size_t GetLength() const override { return numItems; }
+
+ const Input* GetDER(size_t i) const override {
+ return i < numItems ? &items[i] : nullptr;
+ }
+
+ Result Append(Input der) {
+ if (numItems >= MAX_LENGTH) {
+ return Result::FATAL_ERROR_INVALID_ARGS;
+ }
+ Result rv = items[numItems].Init(der); // structure assignment
+ if (rv != Success) {
+ return rv;
+ }
+ ++numItems;
+ return Success;
+ }
+
+ // Public so we can static_assert on this. Keep in sync with MAX_SUBCA_COUNT.
+ static const size_t MAX_LENGTH = 8;
+
+ private:
+ Input items[MAX_LENGTH]; // avoids any heap allocations
+ size_t numItems;
+
+ NonOwningDERArray(const NonOwningDERArray&) = delete;
+ void operator=(const NonOwningDERArray&) = delete;
+};
+
+// Extracts the SignedCertificateTimestampList structure which is encoded as an
+// OCTET STRING within the X.509v3 / OCSP extensions (see RFC 6962 section 3.3).
+Result ExtractSignedCertificateTimestampListFromExtension(Input extnValue,
+ Input& sctList);
+
+inline unsigned int DaysBeforeYear(unsigned int year) {
+ assert(year <= 9999);
+ return ((year - 1u) * 365u) +
+ ((year - 1u) / 4u) // leap years are every 4 years,
+ - ((year - 1u) / 100u) // except years divisible by 100,
+ + ((year - 1u) / 400u); // except years divisible by 400.
+}
+
+static const size_t MAX_DIGEST_SIZE_IN_BYTES = 512 / 8; // sha-512
+
+Result DigestSignedData(TrustDomain& trustDomain,
+ const der::SignedDataWithSignature& signedData,
+ /*out*/ uint8_t (&digestBuf)[MAX_DIGEST_SIZE_IN_BYTES],
+ /*out*/ der::PublicKeyAlgorithm& publicKeyAlg,
+ /*out*/ SignedDigest& signedDigest);
+
+Result VerifySignedDigest(TrustDomain& trustDomain,
+ der::PublicKeyAlgorithm publicKeyAlg,
+ const SignedDigest& signedDigest,
+ Input signerSubjectPublicKeyInfo);
+
+// Combines DigestSignedData and VerifySignedDigest
+Result VerifySignedData(TrustDomain& trustDomain,
+ const der::SignedDataWithSignature& signedData,
+ Input signerSubjectPublicKeyInfo);
+
+// Extracts the key parameters from |subjectPublicKeyInfo|, invoking
+// the relevant methods of |trustDomain|.
+Result CheckSubjectPublicKeyInfo(Input subjectPublicKeyInfo,
+ TrustDomain& trustDomain,
+ EndEntityOrCA endEntityOrCA);
+
+// In a switch over an enum, sometimes some compilers are not satisfied that
+// all control flow paths have been considered unless there is a default case.
+// However, in our code, such a default case is almost always unreachable dead
+// code. That can be particularly problematic when the compiler wants the code
+// to choose a value, such as a return value, for the default case, but there's
+// no appropriate "impossible case" value to choose.
+//
+// MOZILLA_PKIX_UNREACHABLE_DEFAULT_ENUM accounts for this. Example:
+//
+// // In xy.cpp
+// #include "xt.h"
+//
+// enum class XY { X, Y };
+//
+// int func(XY xy) {
+// switch (xy) {
+// case XY::X: return 1;
+// case XY::Y; return 2;
+// MOZILLA_PKIX_UNREACHABLE_DEFAULT_ENUM
+// }
+// }
+#if defined(__clang__)
+// Clang will warn if not all cases are covered (-Wswitch-enum) AND it will
+// warn if a switch statement that covers every enum label has a default case
+// (-W-covered-switch-default). Versions prior to 3.5 warned about unreachable
+// code in such default cases (-Wunreachable-code) even when
+// -W-covered-switch-default was disabled, but that changed in Clang 3.5.
+#define MOZILLA_PKIX_UNREACHABLE_DEFAULT_ENUM // empty
+#elif defined(__GNUC__)
+// GCC will warn if not all cases are covered (-Wswitch-enum). It does not
+// assume that the default case is unreachable.
+#define MOZILLA_PKIX_UNREACHABLE_DEFAULT_ENUM \
+ default: \
+ assert(false); \
+ __builtin_unreachable();
+#elif defined(_MSC_VER)
+// MSVC will warn if not all cases are covered (C4061, level 4). It does not
+// assume that the default case is unreachable.
+#define MOZILLA_PKIX_UNREACHABLE_DEFAULT_ENUM \
+ default: \
+ assert(false); \
+ __assume(0);
+#else
+#error Unsupported compiler for MOZILLA_PKIX_UNREACHABLE_DEFAULT.
+#endif
+}
+} // namespace mozilla::pkix
+
+#endif // mozilla_pkix_pkixutil_h