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LibTLS+Base: Rework default system certificate parser

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Change the default system certificate parser from our arbitrary
INI format to well-known PEM format.
This commit is contained in:
Fabian Dellwing 2023-03-14 14:14:01 +01:00 • committed by Ali Mohammad Pur
parent da6130a6d8
commit 12cd74495a
3 changed files with 38 additions and 264 deletions
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2
Userland/Libraries/LibTLS/Certificate.h
View file

@ -132,7 +132,7 @@ public:
Vector<Certificate> const& certificates() const { return m_ca_certificates; }
void reload_certificates(Core::ConfigFile&);
void reload_certificates(ByteBuffer&);
static DefaultRootCACertificates& the() { return s_the; }

63
Userland/Libraries/LibTLS/TLSv12.cpp
View file

@ -9,11 +9,13 @@
#include <AK/Endian.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/DateTime.h>
#include <LibCore/File.h>
#include <LibCore/Timer.h>
#include <LibCrypto/ASN1/ASN1.h>
#include <LibCrypto/ASN1/PEM.h>
#include <LibCrypto/PK/Code/EMSA_PKCS1_V1_5.h>
#include <LibCrypto/PK/Code/EMSA_PSS.h>
#include <LibTLS/Certificate.h>
#include <LibTLS/TLSv12.h>
#include <errno.h>
@ -468,40 +470,49 @@ Vector<Certificate> TLSv12::parse_pem_certificate(ReadonlyBytes certificate_pem_
Singleton<DefaultRootCACertificates> DefaultRootCACertificates::s_the;
DefaultRootCACertificates::DefaultRootCACertificates()
{
// FIXME: This might not be the best format, find a better way to represent CA certificates.
auto config_result = Core::ConfigFile::open_for_system("ca_certs");
if (config_result.is_error()) {
dbgln("Failed to load CA Certificates: {}", config_result.error());
auto cacert_result = Core::File::open("/etc/cacert.pem"sv, Core::File::OpenMode::Read);
if (cacert_result.is_error()) {
dbgln("Failed to load CA Certificates: {}", cacert_result.error());
return;
}
auto config = config_result.release_value();
reload_certificates(config);
auto cacert_file = cacert_result.release_value();
auto data_result = cacert_file->read_until_eof();
if (data_result.is_error()) {
dbgln("Failed to load CA Certificates: {}", data_result.error());
return;
}
auto data = data_result.release_value();
reload_certificates(data);
}
void DefaultRootCACertificates::reload_certificates(Core::ConfigFile& config)
void DefaultRootCACertificates::reload_certificates(ByteBuffer& data)
{
auto decode_result = Crypto::decode_pems(data);
if (decode_result.is_error()) {
dbgln("Failed to load CA Certificates: {}", decode_result.error());
return;
}
m_ca_certificates.clear();
for (auto& entity : config.groups()) {
for (auto& subject : config.keys(entity)) {
auto certificate_base64 = config.read_entry(entity, subject);
auto certificate_data_result = decode_base64(certificate_base64);
if (certificate_data_result.is_error()) {
dbgln("Skipping CA Certificate {} {}: out of memory", entity, subject);
continue;
}
auto certificate_data = certificate_data_result.release_value();
auto certificate_result = Certificate::parse_asn1(certificate_data.bytes());
// If the certificate does not parse it is likely using elliptic curve keys/signatures, which are not
// supported right now. Currently, ca_certs.ini should only contain certificates with RSA keys/signatures.
if (!certificate_result.has_value()) {
dbgln("Skipping CA Certificate {} {}: unable to parse", entity, subject);
continue;
}
auto certificate = certificate_result.release_value();
m_ca_certificates.append(move(certificate));
auto certs = decode_result.release_value();
for (auto& cert : certs) {
auto certificate_result = Certificate::parse_asn1(cert.bytes());
// If the certificate does not parse it is likely using elliptic curve keys/signatures, which are not
// supported right now. It might make sense to cleanup cacert.pem before adding it to the system.
if (!certificate_result.has_value()) {
// FIXME: It would be nice to have more informations about the certificate we failed to parse.
// Like: Issuer, Algorithm, CN, etc
continue;
}
auto certificate = certificate_result.release_value();
// FIXME: We might want to check additional things here to make sure we only load root CAs:
// - Root certificates are self-signed
// - Either it has matched Authority Key Identifier with Subject Key Identifier,
// - in some cases there is no Authority Key identifier, then Issuer string should match with Subject string
if (certificate.is_certificate_authority)
m_ca_certificates.append(move(certificate));
}
dbgln("Loaded {} CA Certificates", m_ca_certificates.size());
dbgln("Loaded {} of {} ({:.2}%) provided CA Certificates", m_ca_certificates.size(), certs.size(), (m_ca_certificates.size() * 100.0) / certs.size());
}
}