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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/parsed_certificate.h"
#include "net/cert/internal/name_constraints.h"
#include "net/cert/internal/signature_algorithm.h"
#include "net/cert/internal/verify_name_match.h"
#include "net/der/parser.h"
#include "third_party/boringssl/src/include/openssl/pool.h"
namespace net {
namespace {
WARN_UNUSED_RESULT bool GetSequenceValue(const der::Input& tlv,
der::Input* value) {
der::Parser parser(tlv);
return parser.ReadTag(der::kSequence, value) && !parser.HasMore();
}
} // namespace
ParsedCertificate::ParsedCertificate() {}
ParsedCertificate::~ParsedCertificate() {}
// static
scoped_refptr<ParsedCertificate> ParsedCertificate::Create(
bssl::UniquePtr<CRYPTO_BUFFER> cert_data,
const ParseCertificateOptions& options,
CertErrors* errors) {
return CreateInternal(std::move(cert_data), der::Input(), options, errors);
}
// static
bool ParsedCertificate::CreateAndAddToVector(
bssl::UniquePtr<CRYPTO_BUFFER> cert_data,
const ParseCertificateOptions& options,
std::vector<scoped_refptr<net::ParsedCertificate>>* chain,
CertErrors* errors) {
scoped_refptr<ParsedCertificate> cert(
Create(std::move(cert_data), options, errors));
if (!cert)
return false;
chain->push_back(std::move(cert));
return true;
}
// static
scoped_refptr<ParsedCertificate> ParsedCertificate::CreateWithoutCopyingUnsafe(
const uint8_t* data,
size_t length,
const ParseCertificateOptions& options,
CertErrors* errors) {
return CreateInternal(nullptr, der::Input(data, length), options, errors);
}
// static
scoped_refptr<ParsedCertificate> ParsedCertificate::CreateInternal(
bssl::UniquePtr<CRYPTO_BUFFER> backing_data,
der::Input static_data,
const ParseCertificateOptions& options,
CertErrors* errors) {
// TODO(crbug.com/634443): Add errors
scoped_refptr<ParsedCertificate> result(new ParsedCertificate);
if (backing_data) {
result->cert_data_ = std::move(backing_data);
result->cert_ = der::Input(CRYPTO_BUFFER_data(result->cert_data_.get()),
CRYPTO_BUFFER_len(result->cert_data_.get()));
} else {
result->cert_ = static_data;
}
if (!ParseCertificate(result->cert_, &result->tbs_certificate_tlv_,
&result->signature_algorithm_tlv_,
&result->signature_value_, errors)) {
return nullptr;
}
if (!ParseTbsCertificate(result->tbs_certificate_tlv_, options, &result->tbs_,
errors)) {
return nullptr;
}
// Attempt to parse the signature algorithm contained in the Certificate.
// Do not give up on failure here, since SignatureAlgorithm::Create
// will fail on valid but unsupported signature algorithms.
// TODO(mattm): should distinguish between unsupported algorithms and parsing
// errors.
result->signature_algorithm_ =
SignatureAlgorithm::Create(result->signature_algorithm_tlv_, errors);
der::Input subject_value;
if (!GetSequenceValue(result->tbs_.subject_tlv, &subject_value) ||
!NormalizeName(subject_value, &result->normalized_subject_)) {
return nullptr;
}
der::Input issuer_value;
if (!GetSequenceValue(result->tbs_.issuer_tlv, &issuer_value) ||
!NormalizeName(issuer_value, &result->normalized_issuer_)) {
return nullptr;
}
// Parse the standard X.509 extensions and remove them from
// |unparsed_extensions|.
if (result->tbs_.has_extensions) {
// ParseExtensions() ensures there are no duplicates, and maps the (unique)
// OID to the extension value.
if (!ParseExtensions(result->tbs_.extensions_tlv,
&result->unparsed_extensions_)) {
return nullptr;
}
ParsedExtension extension;
// Basic constraints.
if (ConsumeExtension(BasicConstraintsOid(), &result->unparsed_extensions_,
&extension)) {
result->has_basic_constraints_ = true;
if (!ParseBasicConstraints(extension.value, &result->basic_constraints_))
return nullptr;
}
// KeyUsage.
if (ConsumeExtension(KeyUsageOid(), &result->unparsed_extensions_,
&extension)) {
result->has_key_usage_ = true;
if (!ParseKeyUsage(extension.value, &result->key_usage_))
return nullptr;
}
// Subject alternative name.
if (ConsumeExtension(SubjectAltNameOid(), &result->unparsed_extensions_,
&result->subject_alt_names_extension_)) {
// RFC 5280 section 4.2.1.6:
// SubjectAltName ::= GeneralNames
result->subject_alt_names_ =
GeneralNames::Create(result->subject_alt_names_extension_.value);
if (!result->subject_alt_names_)
return nullptr;
// RFC 5280 section 4.1.2.6:
// If subject naming information is present only in the subjectAltName
// extension (e.g., a key bound only to an email address or URI), then the
// subject name MUST be an empty sequence and the subjectAltName extension
// MUST be critical.
if (subject_value.Length() == 0 &&
!result->subject_alt_names_extension_.critical) {
return nullptr;
}
}
// Name constraints.
if (ConsumeExtension(NameConstraintsOid(), &result->unparsed_extensions_,
&extension)) {
result->name_constraints_ =
NameConstraints::Create(extension.value, extension.critical);
if (!result->name_constraints_)
return nullptr;
}
// Authority information access.
if (ConsumeExtension(AuthorityInfoAccessOid(),
&result->unparsed_extensions_,
&result->authority_info_access_extension_)) {
result->has_authority_info_access_ = true;
if (!ParseAuthorityInfoAccess(
result->authority_info_access_extension_.value,
&result->ca_issuers_uris_, &result->ocsp_uris_))
return nullptr;
}
// NOTE: if additional extensions are consumed here, the verification code
// must be updated to process those extensions, since the
// VerifyNoUnconsumedCriticalExtensions uses the unparsed_extensions_
// variable to tell which extensions were processed.
}
return result;
}
} // namespace net
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