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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "parsed_certificate.h"
#include "cert_errors.h"
#include "certificate_policies.h"
#include "extended_key_usage.h"
#include "name_constraints.h"
#include "signature_algorithm.h"
#include "verify_name_match.h"
#include "parser.h"
#include <openssl/pool.h>
namespace bssl {
namespace {
DEFINE_CERT_ERROR_ID(kFailedParsingCertificate, "Failed parsing Certificate");
DEFINE_CERT_ERROR_ID(kFailedParsingTbsCertificate,
"Failed parsing TBSCertificate");
DEFINE_CERT_ERROR_ID(kFailedReadingIssuerOrSubject,
"Failed reading issuer or subject");
DEFINE_CERT_ERROR_ID(kFailedNormalizingSubject, "Failed normalizing subject");
DEFINE_CERT_ERROR_ID(kFailedNormalizingIssuer, "Failed normalizing issuer");
DEFINE_CERT_ERROR_ID(kFailedParsingExtensions, "Failed parsing extensions");
DEFINE_CERT_ERROR_ID(kFailedParsingBasicConstraints,
"Failed parsing basic constraints");
DEFINE_CERT_ERROR_ID(kFailedParsingKeyUsage, "Failed parsing key usage");
DEFINE_CERT_ERROR_ID(kFailedParsingEku, "Failed parsing extended key usage");
DEFINE_CERT_ERROR_ID(kFailedParsingSubjectAltName,
"Failed parsing subjectAltName");
DEFINE_CERT_ERROR_ID(kSubjectAltNameNotCritical,
"Empty subject and subjectAltName is not critical");
DEFINE_CERT_ERROR_ID(kFailedParsingNameConstraints,
"Failed parsing name constraints");
DEFINE_CERT_ERROR_ID(kFailedParsingAia, "Failed parsing authority info access");
DEFINE_CERT_ERROR_ID(kFailedParsingPolicies,
"Failed parsing certificate policies");
DEFINE_CERT_ERROR_ID(kFailedParsingPolicyConstraints,
"Failed parsing policy constraints");
DEFINE_CERT_ERROR_ID(kFailedParsingPolicyMappings,
"Failed parsing policy mappings");
DEFINE_CERT_ERROR_ID(kFailedParsingInhibitAnyPolicy,
"Failed parsing inhibit any policy");
DEFINE_CERT_ERROR_ID(kFailedParsingAuthorityKeyIdentifier,
"Failed parsing authority key identifier");
DEFINE_CERT_ERROR_ID(kFailedParsingSubjectKeyIdentifier,
"Failed parsing subject key identifier");
[[nodiscard]] bool GetSequenceValue(const der::Input& tlv, der::Input* value) {
der::Parser parser(tlv);
return parser.ReadTag(der::kSequence, value) && !parser.HasMore();
}
} // namespace
bool ParsedCertificate::GetExtension(const der::Input& extension_oid,
ParsedExtension* parsed_extension) const {
if (!tbs_.extensions_tlv)
return false;
auto it = extensions_.find(extension_oid);
if (it == extensions_.end()) {
*parsed_extension = ParsedExtension();
return false;
}
*parsed_extension = it->second;
return true;
}
ParsedCertificate::ParsedCertificate(PrivateConstructor) {}
ParsedCertificate::~ParsedCertificate() = default;
// static
std::shared_ptr<const ParsedCertificate> ParsedCertificate::Create(
bssl::UniquePtr<CRYPTO_BUFFER> backing_data,
const ParseCertificateOptions& options,
CertErrors* errors) {
// |errors| is an optional parameter, but to keep the code simpler, use a
// dummy object when one wasn't provided.
CertErrors unused_errors;
if (!errors)
errors = &unused_errors;
auto result = std::make_shared<ParsedCertificate>(PrivateConstructor{});
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()));
if (!ParseCertificate(result->cert_, &result->tbs_certificate_tlv_,
&result->signature_algorithm_tlv_,
&result->signature_value_, errors)) {
errors->AddError(kFailedParsingCertificate);
return nullptr;
}
if (!ParseTbsCertificate(result->tbs_certificate_tlv_, options, &result->tbs_,
errors)) {
errors->AddError(kFailedParsingTbsCertificate);
return nullptr;
}
// Attempt to parse the signature algorithm contained in the Certificate.
result->signature_algorithm_ =
ParseSignatureAlgorithm(result->signature_algorithm_tlv_);
der::Input subject_value;
if (!GetSequenceValue(result->tbs_.subject_tlv, &subject_value)) {
errors->AddError(kFailedReadingIssuerOrSubject);
return nullptr;
}
if (!NormalizeName(subject_value, &result->normalized_subject_, errors)) {
errors->AddError(kFailedNormalizingSubject);
return nullptr;
}
der::Input issuer_value;
if (!GetSequenceValue(result->tbs_.issuer_tlv, &issuer_value)) {
errors->AddError(kFailedReadingIssuerOrSubject);
return nullptr;
}
if (!NormalizeName(issuer_value, &result->normalized_issuer_, errors)) {
errors->AddError(kFailedNormalizingIssuer);
return nullptr;
}
// Parse the standard X.509 extensions.
if (result->tbs_.extensions_tlv) {
// ParseExtensions() ensures there are no duplicates, and maps the (unique)
// OID to the extension value.
if (!ParseExtensions(result->tbs_.extensions_tlv.value(),
&result->extensions_)) {
errors->AddError(kFailedParsingExtensions);
return nullptr;
}
ParsedExtension extension;
// Basic constraints.
if (result->GetExtension(der::Input(kBasicConstraintsOid), &extension)) {
result->has_basic_constraints_ = true;
if (!ParseBasicConstraints(extension.value,
&result->basic_constraints_)) {
errors->AddError(kFailedParsingBasicConstraints);
return nullptr;
}
}
// Key Usage.
if (result->GetExtension(der::Input(kKeyUsageOid), &extension)) {
result->has_key_usage_ = true;
if (!ParseKeyUsage(extension.value, &result->key_usage_)) {
errors->AddError(kFailedParsingKeyUsage);
return nullptr;
}
}
// Extended Key Usage.
if (result->GetExtension(der::Input(kExtKeyUsageOid), &extension)) {
result->has_extended_key_usage_ = true;
if (!ParseEKUExtension(extension.value, &result->extended_key_usage_)) {
errors->AddError(kFailedParsingEku);
return nullptr;
}
}
// Subject alternative name.
if (result->GetExtension(der::Input(kSubjectAltNameOid),
&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, errors);
if (!result->subject_alt_names_) {
errors->AddError(kFailedParsingSubjectAltName);
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) {
errors->AddError(kSubjectAltNameNotCritical);
return nullptr;
}
}
// Name constraints.
if (result->GetExtension(der::Input(kNameConstraintsOid), &extension)) {
result->name_constraints_ =
NameConstraints::Create(extension.value, extension.critical, errors);
if (!result->name_constraints_) {
errors->AddError(kFailedParsingNameConstraints);
return nullptr;
}
}
// Authority information access.
if (result->GetExtension(der::Input(kAuthorityInfoAccessOid),
&result->authority_info_access_extension_)) {
result->has_authority_info_access_ = true;
if (!ParseAuthorityInfoAccessURIs(
result->authority_info_access_extension_.value,
&result->ca_issuers_uris_, &result->ocsp_uris_)) {
errors->AddError(kFailedParsingAia);
return nullptr;
}
}
// Policies.
if (result->GetExtension(der::Input(kCertificatePoliciesOid), &extension)) {
result->has_policy_oids_ = true;
if (!ParseCertificatePoliciesExtensionOids(
extension.value, false /*fail_parsing_unknown_qualifier_oids*/,
&result->policy_oids_, errors)) {
errors->AddError(kFailedParsingPolicies);
return nullptr;
}
}
// Policy constraints.
if (result->GetExtension(der::Input(kPolicyConstraintsOid), &extension)) {
result->has_policy_constraints_ = true;
if (!ParsePolicyConstraints(extension.value,
&result->policy_constraints_)) {
errors->AddError(kFailedParsingPolicyConstraints);
return nullptr;
}
}
// Policy mappings.
if (result->GetExtension(der::Input(kPolicyMappingsOid), &extension)) {
result->has_policy_mappings_ = true;
if (!ParsePolicyMappings(extension.value, &result->policy_mappings_)) {
errors->AddError(kFailedParsingPolicyMappings);
return nullptr;
}
}
// Inhibit Any Policy.
if (result->GetExtension(der::Input(kInhibitAnyPolicyOid), &extension)) {
result->has_inhibit_any_policy_ = true;
if (!ParseInhibitAnyPolicy(extension.value,
&result->inhibit_any_policy_)) {
errors->AddError(kFailedParsingInhibitAnyPolicy);
return nullptr;
}
}
// Subject Key Identifier.
if (result->GetExtension(der::Input(kSubjectKeyIdentifierOid),
&extension)) {
result->subject_key_identifier_ = std::make_optional<der::Input>();
if (!ParseSubjectKeyIdentifier(
extension.value, &result->subject_key_identifier_.value())) {
errors->AddError(kFailedParsingSubjectKeyIdentifier);
return nullptr;
}
}
// Authority Key Identifier.
if (result->GetExtension(der::Input(kAuthorityKeyIdentifierOid),
&extension)) {
result->authority_key_identifier_ =
std::make_optional<ParsedAuthorityKeyIdentifier>();
if (!ParseAuthorityKeyIdentifier(
extension.value, &result->authority_key_identifier_.value())) {
errors->AddError(kFailedParsingAuthorityKeyIdentifier);
return nullptr;
}
}
}
return result;
}
// static
bool ParsedCertificate::CreateAndAddToVector(
bssl::UniquePtr<CRYPTO_BUFFER> cert_data,
const ParseCertificateOptions& options,
std::vector<std::shared_ptr<const bssl::ParsedCertificate>>* chain,
CertErrors* errors) {
std::shared_ptr<const ParsedCertificate> cert(
Create(std::move(cert_data), options, errors));
if (!cert)
return false;
chain->push_back(std::move(cert));
return true;
}
} // namespace net