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// Copyright 2016 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/internal/trust_store_nss.h"
#include <cert.h>
#include <certdb.h>
#include "crypto/nss_util.h"
#include "net/cert/internal/cert_errors.h"
#include "net/cert/internal/parsed_certificate.h"
#include "net/cert/scoped_nss_types.h"
#include "net/cert/test_root_certs.h"
#include "net/cert/x509_util.h"
#include "net/cert/x509_util_nss.h"
namespace net {
TrustStoreNSS::TrustStoreNSS(SECTrustType trust_type)
: trust_type_(trust_type), filter_trusted_certs_by_slot_(false) {}
TrustStoreNSS::TrustStoreNSS(SECTrustType trust_type,
crypto::ScopedPK11Slot user_slot)
: trust_type_(trust_type),
filter_trusted_certs_by_slot_(true),
user_slot_(std::move(user_slot)) {
DCHECK(user_slot_);
}
TrustStoreNSS::TrustStoreNSS(
SECTrustType trust_type,
DisallowTrustForCertsOnUserSlots disallow_trust_for_certs_on_user_slots)
: trust_type_(trust_type), filter_trusted_certs_by_slot_(true) {}
TrustStoreNSS::~TrustStoreNSS() = default;
void TrustStoreNSS::SyncGetIssuersOf(const ParsedCertificate* cert,
ParsedCertificateList* issuers) {
crypto::EnsureNSSInit();
SECItem name;
// Use the original issuer value instead of the normalized version. NSS does a
// less extensive normalization in its Name comparisons, so our normalized
// version may not match the unnormalized version.
name.len = cert->tbs().issuer_tlv.Length();
name.data = const_cast<uint8_t*>(cert->tbs().issuer_tlv.UnsafeData());
// |validOnly| in CERT_CreateSubjectCertList controls whether to return only
// certs that are valid at |sorttime|. Expiration isn't meaningful for trust
// anchors, so request all the matches.
CERTCertList* found_certs = CERT_CreateSubjectCertList(
nullptr /* certList */, CERT_GetDefaultCertDB(), &name,
PR_Now() /* sorttime */, PR_FALSE /* validOnly */);
if (!found_certs)
return;
for (CERTCertListNode* node = CERT_LIST_HEAD(found_certs);
!CERT_LIST_END(node, found_certs); node = CERT_LIST_NEXT(node)) {
CertErrors parse_errors;
scoped_refptr<ParsedCertificate> cur_cert = ParsedCertificate::Create(
x509_util::CreateCryptoBuffer(node->cert->derCert.data,
node->cert->derCert.len),
{}, &parse_errors);
if (!cur_cert) {
// TODO(crbug.com/634443): return errors better.
LOG(ERROR) << "Error parsing issuer certificate:\n"
<< parse_errors.ToDebugString();
continue;
}
issuers->push_back(std::move(cur_cert));
}
CERT_DestroyCertList(found_certs);
}
void TrustStoreNSS::GetTrust(const scoped_refptr<ParsedCertificate>& cert,
CertificateTrust* out_trust,
base::SupportsUserData* debug_data) const {
crypto::EnsureNSSInit();
// TODO(eroman): Inefficient -- path building will convert between
// CERTCertificate and ParsedCertificate representations multiple times
// (when getting the issuers, and again here).
// Note that trust records in NSS are keyed on issuer + serial, and there
// exist builtin distrust records for which a matching certificate is not
// included in the builtin cert list. Therefore, create a temp NSS cert even
// if no existing cert matches. (Eg, this uses CERT_NewTempCertificate, not
// CERT_FindCertByDERCert.)
ScopedCERTCertificate nss_cert(x509_util::CreateCERTCertificateFromBytes(
cert->der_cert().UnsafeData(), cert->der_cert().Length()));
if (!nss_cert) {
*out_trust = CertificateTrust::ForUnspecified();
return;
}
if (!IsCertAllowedForTrust(nss_cert.get())) {
*out_trust = CertificateTrust::ForUnspecified();
return;
}
// Determine the trustedness of the matched certificate.
CERTCertTrust trust;
if (CERT_GetCertTrust(nss_cert.get(), &trust) != SECSuccess) {
*out_trust = CertificateTrust::ForUnspecified();
return;
}
int trust_flags = SEC_GET_TRUST_FLAGS(&trust, trust_type_);
// Determine if the certificate is distrusted.
if ((trust_flags & (CERTDB_TERMINAL_RECORD | CERTDB_TRUSTED_CA |
CERTDB_TRUSTED)) == CERTDB_TERMINAL_RECORD) {
*out_trust = CertificateTrust::ForDistrusted();
return;
}
// Determine if the certificate is a trust anchor.
if ((trust_flags & CERTDB_TRUSTED_CA) == CERTDB_TRUSTED_CA) {
*out_trust = CertificateTrust::ForTrustAnchor();
return;
}
// Trusted server certs (CERTDB_TERMINAL_RECORD + CERTDB_TRUSTED) are
// intentionally treated as unspecified. See https://crbug.com/814994.
*out_trust = CertificateTrust::ForUnspecified();
return;
}
bool TrustStoreNSS::IsCertAllowedForTrust(CERTCertificate* cert) const {
// If |filter_trusted_certs_by_slot_| is false, allow trust for any
// certificate, no matter which slot it is stored on.
if (!filter_trusted_certs_by_slot_)
return true;
crypto::ScopedPK11SlotList slots_for_cert(
PK11_GetAllSlotsForCert(cert, nullptr));
if (!slots_for_cert)
return false;
for (PK11SlotListElement* slot_element =
PK11_GetFirstSafe(slots_for_cert.get());
slot_element;
slot_element = PK11_GetNextSafe(slots_for_cert.get(), slot_element,
/*restart=*/PR_FALSE)) {
PK11SlotInfo* slot = slot_element->slot;
bool allow_slot =
// Allow the root certs module.
PK11_HasRootCerts(slot) ||
// Allow read-only internal slots.
(PK11_IsInternal(slot) && !PK11_IsRemovable(slot)) ||
// Allow |user_slot_| if specified.
(user_slot_ && slot == user_slot_.get());
if (allow_slot) {
PK11_FreeSlotListElement(slots_for_cert.get(), slot_element);
return true;
}
}
return false;
}
} // namespace net
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