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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
257 lines
8.6 KiB
C++
257 lines
8.6 KiB
C++
/*
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* Copyright (c) 2020, Ali Mohammad Pur <ali.mpfard@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Debug.h>
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#include <LibCore/DateTime.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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Optional<ByteBuffer> TLSv12::read()
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{
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if (m_context.application_buffer.size()) {
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auto buf = m_context.application_buffer.slice(0, m_context.application_buffer.size());
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m_context.application_buffer.clear();
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return buf;
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}
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return {};
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}
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ByteBuffer TLSv12::read(size_t max_size)
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{
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if (m_context.application_buffer.size()) {
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auto length = min(m_context.application_buffer.size(), max_size);
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auto buf = m_context.application_buffer.slice(0, length);
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m_context.application_buffer = m_context.application_buffer.slice(length, m_context.application_buffer.size() - length);
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return buf;
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}
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return {};
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}
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String TLSv12::read_line(size_t max_size)
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{
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if (!can_read_line())
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return {};
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auto* start = m_context.application_buffer.data();
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auto* newline = (u8*)memchr(m_context.application_buffer.data(), '\n', m_context.application_buffer.size());
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VERIFY(newline);
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size_t offset = newline - start;
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if (offset > max_size)
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return {};
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auto buffer = ByteBuffer::copy(start, offset);
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m_context.application_buffer = m_context.application_buffer.slice(offset + 1, m_context.application_buffer.size() - offset - 1);
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return String::copy(buffer, Chomp);
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}
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bool TLSv12::write(ReadonlyBytes buffer)
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{
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if (m_context.connection_status != ConnectionStatus::Established) {
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#if TLS_DEBUG
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dbgln("write request while not connected");
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#endif
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return false;
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}
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PacketBuilder builder { MessageType::ApplicationData, m_context.version, buffer.size() };
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builder.append(buffer);
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auto packet = builder.build();
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update_packet(packet);
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write_packet(packet);
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return true;
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}
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bool TLSv12::connect(const String& hostname, int port)
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{
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set_sni(hostname);
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return Core::Socket::connect(hostname, port);
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}
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bool TLSv12::common_connect(const struct sockaddr* saddr, socklen_t length)
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{
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if (m_context.critical_error)
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return false;
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if (Core::Socket::is_connected()) {
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if (is_established()) {
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VERIFY_NOT_REACHED();
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} else {
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Core::Socket::close(); // reuse?
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}
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}
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Core::Socket::on_connected = [this] {
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Core::Socket::on_ready_to_read = [this] {
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read_from_socket();
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};
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auto packet = build_hello();
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write_packet(packet);
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deferred_invoke([&](auto&) {
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m_handshake_timeout_timer = Core::Timer::create_single_shot(
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m_max_wait_time_for_handshake_in_seconds * 1000, [&] {
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auto timeout_diff = Core::DateTime::now().timestamp() - m_context.handshake_initiation_timestamp;
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// If the timeout duration was actually within the max wait time (with a margin of error),
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// we're not operating slow, so the server timed out.
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// otherwise, it's our fault that the negotiation is taking too long, so extend the timer :P
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if (timeout_diff < m_max_wait_time_for_handshake_in_seconds + 1) {
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// The server did not respond fast enough,
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// time the connection out.
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alert(AlertLevel::Critical, AlertDescription::UserCanceled);
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m_context.connection_finished = true;
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m_context.tls_buffer.clear();
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m_context.error_code = Error::TimedOut;
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m_context.critical_error = (u8)Error::TimedOut;
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check_connection_state(false); // Notify the client.
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} else {
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// Extend the timer, we are too slow.
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m_handshake_timeout_timer->restart(m_max_wait_time_for_handshake_in_seconds * 1000);
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}
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},
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this);
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write_into_socket();
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m_handshake_timeout_timer->start();
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m_context.handshake_initiation_timestamp = Core::DateTime::now().timestamp();
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});
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m_has_scheduled_write_flush = true;
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if (on_tls_connected)
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on_tls_connected();
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};
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bool success = Core::Socket::common_connect(saddr, length);
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if (!success)
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return false;
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return true;
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}
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void TLSv12::read_from_socket()
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{
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if (m_context.application_buffer.size() > 0) {
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deferred_invoke([&](auto&) { read_from_socket(); });
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if (on_tls_ready_to_read)
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on_tls_ready_to_read(*this);
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}
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if (!check_connection_state(true))
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return;
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consume(Core::Socket::read(4096));
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}
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void TLSv12::write_into_socket()
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{
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dbgln_if(TLS_DEBUG, "Flushing cached records: {} established? {}", m_context.tls_buffer.size(), is_established());
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m_has_scheduled_write_flush = false;
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if (!check_connection_state(false))
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return;
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flush();
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if (!is_established())
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return;
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if (!m_context.application_buffer.size()) // hey client, you still have stuff to read...
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if (on_tls_ready_to_write)
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on_tls_ready_to_write(*this);
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}
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bool TLSv12::check_connection_state(bool read)
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{
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if (!Core::Socket::is_open() || !Core::Socket::is_connected() || Core::Socket::eof()) {
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// an abrupt closure (the server is a jerk)
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#if TLS_DEBUG
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dbgln("Socket not open, assuming abrupt closure");
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#endif
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m_context.connection_finished = true;
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}
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if (m_context.critical_error) {
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dbgln_if(TLS_DEBUG, "CRITICAL ERROR {} :(", m_context.critical_error);
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if (on_tls_error)
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on_tls_error((AlertDescription)m_context.critical_error);
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return false;
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}
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if (((read && m_context.application_buffer.size() == 0) || !read) && m_context.connection_finished) {
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if (m_context.application_buffer.size() == 0) {
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if (on_tls_finished)
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on_tls_finished();
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}
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if (m_context.tls_buffer.size()) {
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dbgln_if(TLS_DEBUG, "connection closed without finishing data transfer, {} bytes still in buffer and {} bytes in application buffer",
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m_context.tls_buffer.size(),
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m_context.application_buffer.size());
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} else {
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m_context.connection_finished = false;
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#if TLS_DEBUG
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dbgln("FINISHED");
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#endif
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}
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if (!m_context.application_buffer.size()) {
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m_context.connection_status = ConnectionStatus::Disconnected;
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return false;
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}
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}
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return true;
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}
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bool TLSv12::flush()
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{
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auto out_buffer = write_buffer().data();
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size_t out_buffer_index { 0 };
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size_t out_buffer_length = write_buffer().size();
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if (out_buffer_length == 0)
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return true;
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#if TLS_DEBUG
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dbgln("SENDING...");
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print_buffer(out_buffer, out_buffer_length);
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#endif
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if (Core::Socket::write(&out_buffer[out_buffer_index], out_buffer_length)) {
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write_buffer().clear();
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return true;
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}
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if (m_context.send_retries++ == 10) {
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// drop the records, we can't send
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dbgln_if(TLS_DEBUG, "Dropping {} bytes worth of TLS records as max retries has been reached", write_buffer().size());
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write_buffer().clear();
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m_context.send_retries = 0;
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}
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return false;
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}
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}
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