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85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
// Copyright (c) 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/cert/known_roots_mac.h"
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#include <Security/Security.h>
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#include <algorithm>
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#include <vector>
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#include "base/lazy_instance.h"
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#include "crypto/mac_security_services_lock.h"
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#include "net/cert/x509_util_mac.h"
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using base::ScopedCFTypeRef;
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namespace net {
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namespace {
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// Helper class for managing the set of OS X Known Roots. This is only safe
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// to initialize while the crypto::GetMacSecurityServicesLock() is held, due
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// to calling into Security.framework functions; however, once initialized,
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// it can be called at any time.
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// In practice, due to lazy initialization, it's best to just always guard
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// accesses with the lock.
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class OSXKnownRootHelper {
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public:
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bool IsKnownRoot(SecCertificateRef cert) {
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// If there are no known roots, then an API failure occurred. For safety,
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// assume that all certificates are issued by known roots.
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if (known_roots_.empty())
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return true;
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HashValue hash(x509_util::CalculateFingerprint256(cert));
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return IsSHA256HashInSortedArray(hash, known_roots_);
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}
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private:
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friend struct base::LazyInstanceTraitsBase<OSXKnownRootHelper>;
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OSXKnownRootHelper() {
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crypto::GetMacSecurityServicesLock().AssertAcquired();
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CFArrayRef cert_array = NULL;
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OSStatus rv = SecTrustSettingsCopyCertificates(
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kSecTrustSettingsDomainSystem, &cert_array);
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if (rv != noErr) {
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LOG(ERROR) << "Unable to determine trusted roots; assuming all roots are "
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<< "trusted! Error " << rv;
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return;
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}
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base::ScopedCFTypeRef<CFArrayRef> scoped_array(cert_array);
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known_roots_.reserve(CFArrayGetCount(cert_array));
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for (CFIndex i = 0, size = CFArrayGetCount(cert_array); i < size; ++i) {
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SecCertificateRef cert = reinterpret_cast<SecCertificateRef>(
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const_cast<void*>(CFArrayGetValueAtIndex(cert_array, i)));
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known_roots_.push_back(x509_util::CalculateFingerprint256(cert));
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}
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std::sort(known_roots_.begin(), known_roots_.end());
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}
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~OSXKnownRootHelper() {}
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std::vector<SHA256HashValue> known_roots_;
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};
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base::LazyInstance<OSXKnownRootHelper>::Leaky g_known_roots =
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LAZY_INSTANCE_INITIALIZER;
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} // namespace
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bool IsKnownRoot(SecCertificateRef cert) {
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return g_known_roots.Get().IsKnownRoot(cert);
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}
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void InitializeKnownRoots() {
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base::AutoLock lock(crypto::GetMacSecurityServicesLock());
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g_known_roots.Get();
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}
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} // namespace net
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