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/*
* Copyright (c) 2020, Ali Mohammad Pur <mpfard@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <AK/Endian.h>
#include <AK/Random.h>
#include <LibCore/Timer.h>
#include <LibCrypto/ASN1/DER.h>
#include <LibCrypto/PK/Code/EMSA_PSS.h>
#include <LibTLS/TLSv12.h>
namespace TLS {
ssize_t TLSv12::handle_certificate(ReadonlyBytes buffer)
{
ssize_t res = 0;
if (buffer.size() < 3) {
dbgln_if(TLS_DEBUG, "not enough certificate header data");
return (i8)Error::NeedMoreData;
}
u32 certificate_total_length = buffer[0] * 0x10000 + buffer[1] * 0x100 + buffer[2];
dbgln_if(TLS_DEBUG, "total length: {}", certificate_total_length);
if (certificate_total_length <= 4)
return 3 * certificate_total_length;
res += 3;
if (certificate_total_length > buffer.size() - res) {
dbgln_if(TLS_DEBUG, "not enough data for claimed total cert length");
return (i8)Error::NeedMoreData;
}
size_t size = certificate_total_length;
size_t index = 0;
bool valid_certificate = false;
while (size > 0) {
++index;
if (buffer.size() - res < 3) {
dbgln_if(TLS_DEBUG, "not enough data for certificate length");
return (i8)Error::NeedMoreData;
}
size_t certificate_size = buffer[res] * 0x10000 + buffer[res + 1] * 0x100 + buffer[res + 2];
res += 3;
if (buffer.size() - res < certificate_size) {
dbgln_if(TLS_DEBUG, "not enough data for certificate body");
return (i8)Error::NeedMoreData;
}
auto res_cert = res;
auto remaining = certificate_size;
size_t certificates_in_chain = 0;
do {
if (remaining <= 3) {
dbgln("Ran out of data");
break;
}
++certificates_in_chain;
if (buffer.size() < (size_t)res_cert + 3) {
dbgln("not enough data to read cert size ({} < {})", buffer.size(), res_cert + 3);
break;
}
size_t certificate_size_specific = buffer[res_cert] * 0x10000 + buffer[res_cert + 1] * 0x100 + buffer[res_cert + 2];
res_cert += 3;
remaining -= 3;
if (certificate_size_specific > remaining) {
dbgln("invalid certificate size (expected {} but got {})", remaining, certificate_size_specific);
break;
}
remaining -= certificate_size_specific;
auto certificate = Certificate::parse_asn1(buffer.slice(res_cert, certificate_size_specific), false);
if (certificate.has_value()) {
if (certificate.value().is_valid()) {
m_context.certificates.append(certificate.value());
valid_certificate = true;
}
}
res_cert += certificate_size_specific;
} while (remaining > 0);
if (remaining) {
dbgln("extraneous {} bytes left over after parsing certificates", remaining);
}
size -= certificate_size + 3;
res += certificate_size;
}
if (!valid_certificate)
return (i8)Error::UnsupportedCertificate;
if ((size_t)res != buffer.size())
dbgln("some data left unread: {} bytes out of {}", res, buffer.size());
return res;
}
ssize_t TLSv12::handle_certificate_verify(ReadonlyBytes)
{
dbgln("FIXME: parse_verify");
return 0;
}
}
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