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- // Copyright (c) 2017 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "net/cert/known_roots_nss.h"
- #include <cert.h>
- #include <dlfcn.h>
- #include <pk11pub.h>
- #include <secmod.h>
- #include <memory>
- #include "base/compiler_specific.h"
- #include "crypto/nss_util_internal.h"
- #include "net/base/hash_value.h"
- #include "net/cert/x509_util_nss.h"
- namespace net {
- namespace {
- // This can be removed once the minimum NSS version to build is >= 3.30.
- #if !defined(CKA_NSS_MOZILLA_CA_POLICY)
- #define CKA_NSS_MOZILLA_CA_POLICY (CKA_NSS + 34)
- #endif
- using PK11HasAttributeSetFunction = CK_BBOOL (*)(PK11SlotInfo* slot,
- CK_OBJECT_HANDLE id,
- CK_ATTRIBUTE_TYPE type,
- PRBool haslock);
- } // namespace
- // IsKnownRoot returns true if the given certificate is one that we believe
- // is a standard (as opposed to user-installed) root.
- NO_SANITIZE("cfi-icall")
- bool IsKnownRoot(CERTCertificate* root) {
- if (!root || !root->slot)
- return false;
- static PK11HasAttributeSetFunction pk11_has_attribute_set =
- reinterpret_cast<PK11HasAttributeSetFunction>(
- dlsym(RTLD_DEFAULT, "PK11_HasAttributeSet"));
- if (pk11_has_attribute_set) {
- // Historically, the set of root certs was determined based on whether or
- // not it was part of nssckbi.[so,dll], the read-only PKCS#11 module that
- // exported the certs with trust settings. However, some distributions,
- // notably those in the Red Hat family, replace nssckbi with a redirect to
- // their own store, such as from p11-kit, which can support more robust
- // trust settings, like per-system trust, admin-defined, and user-defined
- // trust.
- //
- // As a given certificate may exist in multiple modules and slots, scan
- // through all of the available modules, all of the (connected) slots on
- // those modules, and check to see if it has the CKA_NSS_MOZILLA_CA_POLICY
- // attribute set. This attribute indicates it's from the upstream Mozilla
- // trust store, and these distributions preserve the attribute as a flag.
- crypto::AutoSECMODListReadLock lock_id;
- for (const SECMODModuleList* item = SECMOD_GetDefaultModuleList();
- item != nullptr; item = item->next) {
- for (int i = 0; i < item->module->slotCount; ++i) {
- PK11SlotInfo* slot = item->module->slots[i];
- if (PK11_IsPresent(slot) && PK11_HasRootCerts(slot)) {
- CK_OBJECT_HANDLE handle = PK11_FindCertInSlot(slot, root, nullptr);
- if (handle != CK_INVALID_HANDLE &&
- pk11_has_attribute_set(slot, handle, CKA_NSS_MOZILLA_CA_POLICY,
- PR_FALSE) == CK_TRUE) {
- return true;
- }
- }
- }
- }
- return false;
- }
- // This magic name is taken from
- // http://bonsai.mozilla.org/cvsblame.cgi?file=mozilla/security/nss/lib/ckfw/builtins/constants.c&rev=1.13&mark=86,89#79
- return 0 == strcmp(PK11_GetSlotName(root->slot), "NSS Builtin Objects");
- }
- } // namespace net
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