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95 lines
3.7 KiB
C++
95 lines
3.7 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_nss.h"
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#include <cert.h>
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#include <dlfcn.h>
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#include <pk11pub.h>
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#include <secmod.h>
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#include <memory>
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#include "base/memory/protected_memory.h"
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#include "base/memory/protected_memory_cfi.h"
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#include "crypto/nss_util_internal.h"
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#include "net/base/hash_value.h"
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#include "net/cert/x509_util_nss.h"
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namespace net {
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namespace {
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// This can be removed once the minimum NSS version to build is >= 3.30.
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#if !defined(CKA_NSS_MOZILLA_CA_POLICY)
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#define CKA_NSS_MOZILLA_CA_POLICY (CKA_NSS + 34)
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#endif
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using PK11HasAttributeSetFunction = CK_BBOOL (*)(PK11SlotInfo* slot,
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CK_OBJECT_HANDLE id,
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CK_ATTRIBUTE_TYPE type,
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PRBool haslock);
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static PROTECTED_MEMORY_SECTION
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base::ProtectedMemory<PK11HasAttributeSetFunction>
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g_pk11_has_attribute_set;
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// The function pointer for PK11_HasAttributeSet is saved to read-only memory
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// after being dynamically resolved as a security mitigation to prevent the
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// pointer from being tampered with. See https://crbug.com/771365 for details.
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const base::ProtectedMemory<PK11HasAttributeSetFunction>&
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ResolvePK11HasAttributeSet() {
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static base::ProtectedMemory<PK11HasAttributeSetFunction>::Initializer init(
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&g_pk11_has_attribute_set,
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reinterpret_cast<PK11HasAttributeSetFunction>(
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dlsym(RTLD_DEFAULT, "PK11_HasAttributeSet")));
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return g_pk11_has_attribute_set;
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}
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} // namespace
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// IsKnownRoot returns true if the given certificate is one that we believe
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// is a standard (as opposed to user-installed) root.
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bool IsKnownRoot(CERTCertificate* root) {
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if (!root || !root->slot)
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return false;
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if (*ResolvePK11HasAttributeSet() != nullptr) {
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// Historically, the set of root certs was determined based on whether or
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// not it was part of nssckbi.[so,dll], the read-only PKCS#11 module that
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// exported the certs with trust settings. However, some distributions,
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// notably those in the Red Hat family, replace nssckbi with a redirect to
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// their own store, such as from p11-kit, which can support more robust
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// trust settings, like per-system trust, admin-defined, and user-defined
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// trust.
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//
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// As a given certificate may exist in multiple modules and slots, scan
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// through all of the available modules, all of the (connected) slots on
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// those modules, and check to see if it has the CKA_NSS_MOZILLA_CA_POLICY
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// attribute set. This attribute indicates it's from the upstream Mozilla
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// trust store, and these distributions preserve the attribute as a flag.
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crypto::AutoSECMODListReadLock lock_id;
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for (const SECMODModuleList* item = SECMOD_GetDefaultModuleList();
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item != nullptr; item = item->next) {
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for (int i = 0; i < item->module->slotCount; ++i) {
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PK11SlotInfo* slot = item->module->slots[i];
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if (PK11_IsPresent(slot) && PK11_HasRootCerts(slot)) {
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CK_OBJECT_HANDLE handle = PK11_FindCertInSlot(slot, root, nullptr);
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if (handle != CK_INVALID_HANDLE &&
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UnsanitizedCfiCall(ResolvePK11HasAttributeSet())(
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root->slot, handle, CKA_NSS_MOZILLA_CA_POLICY, PR_FALSE) ==
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CK_TRUE) {
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return true;
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}
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}
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}
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}
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}
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// This magic name is taken from
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// http://bonsai.mozilla.org/cvsblame.cgi?file=mozilla/security/nss/lib/ckfw/builtins/constants.c&rev=1.13&mark=86,89#79
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return 0 == strcmp(PK11_GetSlotName(root->slot), "NSS Builtin Objects");
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}
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} // namespace net
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