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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/certificate_provider/thread_safe_certificate_map.h"
#include <string>
#include <string_view>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/synchronization/lock.h"
#include "chromeos/components/certificate_provider/certificate_info.h"
#include "net/base/hash_value.h"
#include "net/cert/asn1_util.h"
#include "net/cert/x509_certificate.h"
#include "net/cert/x509_util.h"
namespace chromeos {
namespace certificate_provider {
namespace {
std::string GetSubjectPublicKeyInfo(const net::X509Certificate& certificate) {
std::string_view spki_bytes;
if (!net::asn1::ExtractSPKIFromDERCert(
net::x509_util::CryptoBufferAsStringPiece(certificate.cert_buffer()),
&spki_bytes)) {
return {};
}
return std::string(spki_bytes);
}
} // namespace
ThreadSafeCertificateMap::ThreadSafeCertificateMap() = default;
ThreadSafeCertificateMap::~ThreadSafeCertificateMap() = default;
void ThreadSafeCertificateMap::UpdateCertificatesForExtension(
const std::string& extension_id,
const CertificateInfoList& certificates) {
base::AutoLock auto_lock(lock_);
RemoveCertificatesProvidedByExtension(extension_id);
for (const CertificateInfo& cert_info : certificates) {
const net::SHA256HashValue fingerprint =
net::X509Certificate::CalculateFingerprint256(
cert_info.certificate->cert_buffer());
fingerprint_to_extension_and_cert_[fingerprint][extension_id] = cert_info;
const std::string spki = GetSubjectPublicKeyInfo(*cert_info.certificate);
spki_to_extension_and_cert_[spki][extension_id] = cert_info;
}
}
std::vector<scoped_refptr<net::X509Certificate>>
ThreadSafeCertificateMap::GetCertificates() {
base::AutoLock auto_lock(lock_);
std::vector<scoped_refptr<net::X509Certificate>> certificates;
for (const auto& fingerprint_entry : fingerprint_to_extension_and_cert_) {
const ExtensionToCertificateMap* extension_to_certificate_map =
&fingerprint_entry.second;
if (!extension_to_certificate_map->empty()) {
// If there are multiple entries with the same fingerprint, they are the
// same certificate as SHA256 should not have collisions.
// Since we need each certificate only once, we can return any entry.
certificates.push_back(
extension_to_certificate_map->begin()->second.certificate);
}
}
return certificates;
}
bool ThreadSafeCertificateMap::LookUpCertificate(
const net::X509Certificate& cert,
bool* is_currently_provided,
CertificateInfo* info,
std::string* extension_id) {
*is_currently_provided = false;
const net::SHA256HashValue fingerprint =
net::X509Certificate::CalculateFingerprint256(cert.cert_buffer());
base::AutoLock auto_lock(lock_);
const auto it = fingerprint_to_extension_and_cert_.find(fingerprint);
if (it == fingerprint_to_extension_and_cert_.end())
return false;
ExtensionToCertificateMap* const map = &it->second;
if (!map->empty()) {
// If multiple entries are found, it is unspecified which is returned.
const auto map_entry = map->begin();
*is_currently_provided = true;
*info = map_entry->second;
*extension_id = map_entry->first;
}
return true;
}
bool ThreadSafeCertificateMap::LookUpCertificateBySpki(
const std::string& subject_public_key_info,
bool* is_currently_provided,
CertificateInfo* info,
std::string* extension_id) {
*is_currently_provided = false;
base::AutoLock auto_lock(lock_);
const auto it = spki_to_extension_and_cert_.find(subject_public_key_info);
if (it == spki_to_extension_and_cert_.end())
return false;
ExtensionToCertificateMap* const map = &it->second;
if (!map->empty()) {
// If multiple entries are found, it is unspecified which is returned.
const auto map_entry = map->begin();
*is_currently_provided = true;
*info = map_entry->second;
*extension_id = map_entry->first;
}
return true;
}
void ThreadSafeCertificateMap::RemoveExtension(
const std::string& extension_id) {
base::AutoLock auto_lock(lock_);
RemoveCertificatesProvidedByExtension(extension_id);
}
void ThreadSafeCertificateMap::RemoveCertificatesProvidedByExtension(
const std::string& extension_id) {
for (auto& entry : fingerprint_to_extension_and_cert_) {
ExtensionToCertificateMap* map = &entry.second;
map->erase(extension_id);
}
for (auto& entry : spki_to_extension_and_cert_) {
ExtensionToCertificateMap* map = &entry.second;
map->erase(extension_id);
}
}
} // namespace certificate_provider
} // namespace chromeos
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