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