Add basic SSL/TLS listener
This commit adds a basic SSL/TLS listener using `openssl`. The `SslListener` object can accept a connection and get a decrypted stream. Signed-off-by: Sayan Nandan <nandansayan@outlook.com>next
Sayan Nandan
4 years ago
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5d17e0a89d
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/*
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* Created on Fri Dec 18 2020
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*
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* This file is a part of TerrabaseDB
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* Copyright (c) 2020, Sayan Nandan <ohsayan at outlook dot com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#[allow(dead_code)] // TODO: Don't keep clippy quiet!
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// use crate::dbnet::CHandler;
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// use crate::dbnet::Terminator;
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// use crate::protocol::Connection;
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use crate::CoreDB;
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use libtdb::TResult;
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use openssl::ssl::{SslAcceptor, SslFiletype, SslMethod};
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// use std::net::ToSocketAddrs;
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use std::sync::Arc;
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// use tokio::io::{AsyncReadExt, AsyncWrite, AsyncWriteExt};
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use tokio::net::TcpListener;
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use tokio::net::TcpStream;
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use tokio::sync::Semaphore;
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use tokio::sync::{broadcast, mpsc};
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use tokio::time::{self, Duration};
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use tokio_openssl_vendored::SslStream;
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pub struct SslListener {
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/// An atomic reference to the coretable
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db: CoreDB,
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/// The incoming connection listener (binding)
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listener: TcpListener,
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/// The maximum number of connections
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climit: Arc<Semaphore>,
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/// The shutdown broadcaster
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signal: broadcast::Sender<()>,
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// When all `Sender`s are dropped - the `Receiver` gets a `None` value
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// We send a clone of `terminate_tx` to each `CHandler`
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terminate_tx: mpsc::Sender<()>,
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terminate_rx: mpsc::Receiver<()>,
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acceptor: Arc<SslAcceptor>,
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}
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impl SslListener {
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pub fn new_pem_based_ssl_connection(
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key_file: String,
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chain_file: String,
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db: CoreDB,
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listener: TcpListener,
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climit: Arc<Semaphore>,
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signal: broadcast::Sender<()>,
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terminate_tx: mpsc::Sender<()>,
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terminate_rx: mpsc::Receiver<()>,
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) -> TResult<Self> {
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let mut acceptor = SslAcceptor::mozilla_intermediate(SslMethod::tls())?;
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acceptor.set_private_key_file(key_file, SslFiletype::PEM)?;
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acceptor.set_certificate_chain_file(chain_file)?;
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let acceptor = Arc::new(acceptor.build());
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Ok(SslListener {
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db,
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listener,
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climit,
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signal,
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terminate_tx,
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terminate_rx,
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acceptor,
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})
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}
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async fn accept(&mut self) -> TResult<SslStream<TcpStream>> {
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let mut backoff = 1;
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loop {
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match self.listener.accept().await {
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// We don't need the bindaddr
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// We get the encrypted stream which we need to decrypt
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// by using the acceptor
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Ok((encrypted_stream, _)) => {
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let decrypted_stream =
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tokio_openssl_vendored::accept(&self.acceptor, encrypted_stream).await?;
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return Ok(decrypted_stream);
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}
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Err(e) => {
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if backoff > 64 {
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// Too many retries, goodbye user
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return Err(e.into());
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}
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}
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}
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// Wait for the `backoff` duration
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time::sleep(Duration::from_secs(backoff)).await;
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// We're using exponential backoff
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backoff *= 2;
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}
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}
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}
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