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ssl_session.cc
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ssl_session.cc
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/*
* Copyright (c) 2015 Juniper Networks, Inc. All rights reserved.
*/
#include "io/ssl_session.h"
#include <string>
#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include "io/io_log.h"
#include "io/io_utils.h"
using boost::asio::async_write;
using boost::asio::buffer;
using boost::asio::buffer_cast;
using boost::asio::mutable_buffer;
using boost::asio::mutable_buffers_1;
using boost::asio::null_buffers;
using boost::asio::placeholders::error;
using boost::asio::ssl::stream_base;
using boost::bind;
using boost::function;
using boost::system::error_code;
using std::size_t;
using std::srand;
using std::string;
using std::time;
class SslSession::SslReader : public Task {
public:
typedef function<void(Buffer)> ReadHandler;
SslReader(int task_id, SslSessionPtr session, ReadHandler read_fn,
Buffer buffer)
: Task(task_id, session->GetSessionInstance()),
session_(session), read_fn_(read_fn), buffer_(buffer) {
}
virtual bool Run() {
if (session_->IsEstablished()) {
read_fn_(buffer_);
if (session_->IsSslDisabled()) {
session_->AsyncReadStart();
} else if (!session_->IsSslHandShakeInProgress()) {
session_->AsyncReadStart();
}
}
return true;
}
string Description() const { return "SslSession::SslReader"; }
private:
SslSessionPtr session_;
ReadHandler read_fn_;
Buffer buffer_;
};
SslSession::SslSession(SslServer *server, SslSocket *ssl_socket,
bool async_read_ready)
: TcpSession(server, NULL, async_read_ready),
ssl_socket_(ssl_socket),
ssl_handshake_in_progress_(false),
ssl_handshake_success_(false),
ssl_enabled_(true),
ssl_handshake_delayed_(false) {
if (server) {
ssl_enabled_ = server->ssl_enabled_;
ssl_handshake_delayed_ = server->ssl_handshake_delayed_;
}
}
SslSession::~SslSession() {
}
Task* SslSession::CreateReaderTask(mutable_buffer buffer,
size_t bytes_transferred) {
Buffer rdbuf(buffer_cast<const uint8_t *>(buffer), bytes_transferred);
SslReader *task = new SslReader(this->reader_task_id(),
SslSessionPtr(this), bind(&SslSession::OnRead, this, _1), rdbuf);
return (task);
}
TcpSession::Socket *SslSession::socket() const {
// return tcp socket
return &ssl_socket_->next_layer();
}
// Register for data read notification from the tcp socket or from the ssl
// socket, as appropriate.
void SslSession::AsyncReadSome() {
assert(!ssl_handshake_in_progress_);
if (!IsSslHandShakeSuccessLocked()) {
TcpSession::AsyncReadSome();
return;
}
if (established()) {
socket()->async_read_some(null_buffers(),
bind(&TcpSession::AsyncReadHandler, TcpSessionPtr(this)));
}
}
// Tests with large data have consistently shown 16K as the maximum read data
// size even though when a lot more data was available in the underlying socket.
// Also, there is no available() api for the ssl socket.
size_t SslSession::GetReadBufferSize() const {
return kDefaultBufferSize;
}
size_t SslSession::ReadSome(mutable_buffer buffer, error_code *error) {
// Read data from the tcp socket or from the ssl socket, as appropriate.
assert(!ssl_handshake_in_progress_);
if (!IsSslHandShakeSuccessLocked())
return TcpSession::ReadSome(buffer, error);
// do ssl read here in IO context, ignore errors
return ssl_socket_->read_some(mutable_buffers_1(buffer), *error);
}
size_t SslSession::WriteSome(const uint8_t *data, size_t len,
error_code *error) {
if (IsSslHandShakeSuccessLocked()) {
return ssl_socket_->write_some(buffer(data, len), *error);
} else {
return (TcpSession::WriteSome(data, len, error));
}
}
void SslSession::AsyncWrite(const u_int8_t *data, size_t size) {
if (IsSslHandShakeSuccessLocked()) {
async_write(*ssl_socket_.get(), buffer(data, size),
bind(&TcpSession::AsyncWriteHandler,
TcpSessionPtr(this), error));
} else {
return (TcpSession::AsyncWrite(data, size));
}
}
void SslSession::SslHandShakeCallback(SslHandShakeCallbackHandler cb,
SslSessionPtr session,
const error_code &error) {
session->ssl_handshake_in_progress_ = false;
if (!error) {
session->SetSslHandShakeSuccess();
} else {
session->SetSslHandShakeFailure();
}
if (session->socket() != NULL && !(session->IsClosed())) {
cb(session, error);
}
}
void SslSession::TriggerSslHandShakeInternal(
SslSessionPtr session, SslHandShakeCallbackHandler cb) {
srand(time(0));
error_code ec;
session->ssl_handshake_in_progress_ = true;
if (session->IsServerSession()) {
session->ssl_socket_->async_handshake(stream_base::server,
bind(&SslSession::SslHandShakeCallback, cb, session,
error));
} else {
session->ssl_socket_->async_handshake(stream_base::client,
bind(&SslSession::SslHandShakeCallback, cb, session,
error));
}
}
void SslSession::TriggerSslHandShake(SslHandShakeCallbackHandler cb) {
server()->event_manager()->io_service()->post(
bind(&TriggerSslHandShakeInternal, SslSessionPtr(this), cb));
}