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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "async_crypto_socket.h"
#include <vespa/vespalib/net/tls/protocol_snooping.h>
#include <vespa/vespalib/net/tls/tls_crypto_engine.h>
#include <vespa/vespalib/net/tls/crypto_codec.h>
#include <vespa/vespalib/data/smart_buffer.h>
namespace vespalib::coro {
namespace {
using net::tls::CryptoCodec;
using net::tls::HandshakeResult;
using net::tls::EncodeResult;
using net::tls::DecodeResult;
struct InvalidSocket : AsyncCryptoSocket {
Lazy<ssize_t> read(char *, size_t) override { co_return -EINVAL; }
Lazy<ssize_t> write(const char *, size_t) override { co_return -EINVAL; }
};
struct RawSocket : AsyncCryptoSocket {
AsyncIo::SP async;
SocketHandle handle;
RawSocket(AsyncIo &async_in, SocketHandle handle_in)
: async(async_in.shared_from_this()), handle(std::move(handle_in)) {}
RawSocket(RawSocket &&) noexcept;
~RawSocket() override;
Lazy<ssize_t> read(char *buf, size_t len) override {
return async->read(handle, buf, len);
}
Lazy<ssize_t> write(const char *buf, size_t len) override {
return async->write(handle, buf, len);
}
};
RawSocket::~RawSocket() = default;
struct SnoopedRawSocket : AsyncCryptoSocket {
AsyncIo::SP async;
SocketHandle handle;
SmartBuffer data;
SnoopedRawSocket(AsyncIo &async_in, SocketHandle handle_in)
: async(async_in.shared_from_this()), handle(std::move(handle_in)), data(0) {}
SnoopedRawSocket(SnoopedRawSocket &&) noexcept;
~SnoopedRawSocket() override;
void inject_data(const char *buf, size_t len) {
if (len > 0) {
auto dst = data.reserve(len);
memcpy(dst.data, buf, len);
data.commit(len);
}
}
Lazy<ssize_t> read_from_buffer(char *buf, size_t len) {
auto src = data.obtain();
size_t frame = std::min(len, src.size);
if (frame > 0) {
memcpy(buf, src.data, frame);
data.evict(frame);
data.drop_if_empty();
}
co_return frame;
}
Lazy<ssize_t> read(char *buf, size_t len) override {
if (data.empty()) {
return async->read(handle, buf, len);
} else {
return read_from_buffer(buf, len);
}
}
Lazy<ssize_t> write(const char *buf, size_t len) override {
return async->write(handle, buf, len);
}
};
SnoopedRawSocket::~SnoopedRawSocket() = default;
struct TlsSocket : AsyncCryptoSocket {
AsyncIo::SP async;
SocketHandle handle;
std::unique_ptr<CryptoCodec> codec;
SmartBuffer app_input;
SmartBuffer enc_input;
SmartBuffer enc_output;
TlsSocket(AsyncIo &async_in, SocketHandle handle_in, std::unique_ptr<CryptoCodec> codec_in)
: async(async_in.shared_from_this()), handle(std::move(handle_in)), codec(std::move(codec_in)),
app_input(0), enc_input(0), enc_output(0) {}
TlsSocket(TlsSocket &&) noexcept;
~TlsSocket() override;
void inject_enc_input(const char *buf, size_t len) {
if (len > 0) {
auto dst = enc_input.reserve(len);
memcpy(dst.data, buf, len);
enc_input.commit(len);
}
}
Lazy<bool> flush_enc_output() {
while (!enc_output.empty()) {
auto pending = enc_output.obtain();
auto res = co_await async->write(handle, pending.data, pending.size);
if (res > 0) {
enc_output.evict(res);
} else {
co_return false;
}
}
co_return true;
}
Lazy<bool> fill_enc_input() {
auto dst = enc_input.reserve(codec->min_encode_buffer_size());
ssize_t res = co_await async->read(handle, dst.data, dst.size);
if (res > 0) {
enc_input.commit(res);
co_return true;
} else {
co_return false;
}
}
Lazy<bool> handshake() {
for (;;) {
auto in = enc_input.obtain();
auto out = enc_output.reserve(codec->min_encode_buffer_size());
auto hs_res = codec->handshake(in.data, in.size, out.data, out.size);
enc_input.evict(hs_res.bytes_consumed);
enc_output.commit(hs_res.bytes_produced);
switch (hs_res.state) {
case ::vespalib::net::tls::HandshakeResult::State::Failed: co_return false;
case ::vespalib::net::tls::HandshakeResult::State::Done: co_return co_await flush_enc_output();
case ::vespalib::net::tls::HandshakeResult::State::NeedsWork:
codec->do_handshake_work();
break;
case ::vespalib::net::tls::HandshakeResult::State::NeedsMorePeerData:
bool flush_ok = co_await flush_enc_output();
if (!flush_ok) {
co_return false;
}
bool fill_ok = co_await fill_enc_input();
if (!fill_ok) {
co_return false;
}
}
}
}
Lazy<ssize_t> read(char *buf, size_t len) override {
while (app_input.empty()) {
auto src = enc_input.obtain();
auto dst = app_input.reserve(codec->min_decode_buffer_size());
auto res = codec->decode(src.data, src.size, dst.data, dst.size);
app_input.commit(res.bytes_produced);
enc_input.evict(res.bytes_consumed);
if (res.failed()) {
co_return -EIO;
}
if (res.closed()) {
co_return 0;
}
if (app_input.empty()) {
bool fill_ok = co_await fill_enc_input();
if (!fill_ok) {
co_return -EIO;
}
}
}
auto src = app_input.obtain();
size_t frame = std::min(len, src.size);
if (frame > 0) {
memcpy(buf, src.data, frame);
app_input.evict(frame);
}
co_return frame;
}
Lazy<ssize_t> write(const char *buf, size_t len) override {
auto dst = enc_output.reserve(codec->min_encode_buffer_size());
auto res = codec->encode(buf, len, dst.data, dst.size);
if (res.failed) {
co_return -EIO;
}
enc_output.commit(res.bytes_produced);
bool flush_ok = co_await flush_enc_output();
if (!flush_ok) {
co_return -EIO;
}
co_return res.bytes_consumed;
}
};
TlsSocket::~TlsSocket() = default;
Lazy<AsyncCryptoSocket::UP> try_handshake(std::unique_ptr<TlsSocket> tls_socket) {
bool hs_ok = co_await tls_socket->handshake();
if (hs_ok) {
co_return std::move(tls_socket);
} else {
co_return std::make_unique<InvalidSocket>();
}
}
Lazy<AsyncCryptoSocket::UP> accept_tls(AsyncIo &async, AbstractTlsCryptoEngine &crypto, SocketHandle handle) {
auto tls_codec = crypto.create_tls_server_crypto_codec(handle);
auto tls_socket = std::make_unique<TlsSocket>(async, std::move(handle), std::move(tls_codec));
co_return co_await try_handshake(std::move(tls_socket));
}
Lazy<AsyncCryptoSocket::UP> accept_maybe_tls(AsyncIo &async, AbstractTlsCryptoEngine &crypto, SocketHandle handle) {
char buf[net::tls::snooping::min_header_bytes_to_observe()];
memset(buf, 0, sizeof(buf));
size_t snooped = 0;
while (snooped < sizeof(buf)) {
auto res = co_await async.read(handle, buf + snooped, sizeof(buf) - snooped);
if (res <= 0) {
co_return std::make_unique<InvalidSocket>();
}
snooped += res;
}
if (net::tls::snooping::snoop_client_hello_header(buf) == net::tls::snooping::TlsSnoopingResult::ProbablyTls) {
auto tls_codec = crypto.create_tls_server_crypto_codec(handle);
auto tls_socket = std::make_unique<TlsSocket>(async, std::move(handle), std::move(tls_codec));
tls_socket->inject_enc_input(buf, snooped);
co_return co_await try_handshake(std::move(tls_socket));
} else {
auto plain_socket = std::make_unique<SnoopedRawSocket>(async, std::move(handle));
plain_socket->inject_data(buf, snooped);
co_return plain_socket;
}
}
Lazy<AsyncCryptoSocket::UP> connect_tls(AsyncIo &async, AbstractTlsCryptoEngine &crypto, SocketHandle handle, SocketSpec spec) {
auto tls_codec = crypto.create_tls_client_crypto_codec(handle, spec);
auto tls_socket = std::make_unique<TlsSocket>(async, std::move(handle), std::move(tls_codec));
co_return co_await try_handshake(std::move(tls_socket));
}
}
AsyncCryptoSocket::~AsyncCryptoSocket() = default;
Lazy<AsyncCryptoSocket::UP>
AsyncCryptoSocket::accept(AsyncIo &async, CryptoEngine &crypto,
SocketHandle handle)
{
if (dynamic_cast<NullCryptoEngine*>(&crypto)) {
co_return std::make_unique<RawSocket>(async, std::move(handle));
}
if (auto *tls_engine = dynamic_cast<AbstractTlsCryptoEngine*>(&crypto)) {
if (tls_engine->always_use_tls_when_server()) {
co_return co_await accept_tls(async, *tls_engine, std::move(handle));
} else {
co_return co_await accept_maybe_tls(async, *tls_engine, std::move(handle));
}
}
co_return std::make_unique<InvalidSocket>();
}
Lazy<AsyncCryptoSocket::UP>
AsyncCryptoSocket::connect(AsyncIo &async, CryptoEngine &crypto,
SocketHandle handle, SocketSpec spec)
{
if (dynamic_cast<NullCryptoEngine*>(&crypto)) {
(void) spec; // no SNI for plaintext sockets
co_return std::make_unique<RawSocket>(async, std::move(handle));
}
if (auto *tls_engine = dynamic_cast<AbstractTlsCryptoEngine*>(&crypto)) {
if (tls_engine->use_tls_when_client()) {
co_return co_await connect_tls(async, *tls_engine, std::move(handle), spec);
} else {
co_return std::make_unique<RawSocket>(async, std::move(handle));
}
}
co_return std::make_unique<InvalidSocket>();
}
}
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