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Session split

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This commit is contained in:
Matéo Duparc 2021-05-05 12:30:37 +02:00
parent a42f5a2e87
commit a988c537e2
Signed by: hardcoresushi
GPG Key ID: 007F84120107191E
2 changed files with 174 additions and 106 deletions
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35
src/session_manager/mod.rs
View File

@ -12,6 +12,8 @@ use platform_dirs::UserDirs;
use crate::{constants, crypto, discovery, identity::{Contact, Identity}, print_error, utils::{get_unix_timestamp, get_not_used_path}};
use crate::ui_interface::UiConnection;
use self::session::SessionWrite;
#[derive(Display, Debug, PartialEq, Eq)]
pub enum SessionError {
ConnectionReset,
@ -173,8 +175,8 @@ impl SessionManager {
self.not_seen.write().unwrap().retain(|x| x != session_id);
}
async fn send_msg(&self, session_id: usize, session: &mut Session, buff: &[u8], aborted: &mut bool, file_ack_sender: Option<&Sender<bool>>) -> Result<(), SessionError> {
session.encrypt_and_send(&buff).await?;
async fn send_msg(&self, session_id: usize, session_write: &mut SessionWrite, buff: &[u8], aborted: &mut bool, file_ack_sender: Option<&Sender<bool>>) -> Result<(), SessionError> {
session_write.encrypt_and_send(&buff).await?;
if buff[0] == protocol::Headers::ACCEPT_LARGE_FILE {
self.sessions.write().unwrap().get_mut(&session_id).unwrap().file_download.as_mut().unwrap().state = FileState::ACCEPTED;
} else if buff[0] == protocol::Headers::ABORT_FILE_TRANSFER {
@ -192,7 +194,7 @@ impl SessionManager {
Ok(())
}
async fn session_worker(&self, session_id: usize, mut receiver: Receiver<SessionCommand>, mut session: Session) {
async fn session_worker(&self, session_id: usize, mut receiver: Receiver<SessionCommand>, session: Session) {
//used when we receive large file
let mut local_file_path = None;
let mut local_file_handle = None;
@ -201,18 +203,23 @@ impl SessionManager {
let mut file_ack_sender: Option<Sender<bool>> = None;
let mut msg_queue = Vec::new();
let mut aborted = false;
let (session_read, mut session_write) = session.into_spit().unwrap();
let receiving = session_read.receive_and_decrypt();
tokio::pin!(receiving);
loop {
tokio::select! {
buffer = session.receive_and_decrypt() => {
match buffer {
Ok(buffer) => {
result = &mut receiving => {
match result {
Ok((session_read, buffer)) => {
receiving.set(session_read.receive_and_decrypt());
match buffer[0] {
protocol::Headers::ASK_NAME => {
let name = {
self.identity.read().unwrap().as_ref().and_then(|identity| Some(identity.name.clone()))
};
if name.is_some() { //can be None if we log out just before locking the identity mutex
if let Err(e) = session.encrypt_and_send(&protocol::tell_name(&name.unwrap())).await {
if let Err(e) = session_write.encrypt_and_send(&protocol::tell_name(&name.unwrap())).await {
print_error!(e);
break;
}
@ -254,7 +261,7 @@ impl SessionManager {
ui_connection.on_ask_large_file(&session_id, file_size, &file_name, download_dir.to_str().unwrap());
})
}
} else if let Err(e) = session.encrypt_and_send(&[protocol::Headers::ABORT_FILE_TRANSFER]).await {
} else if let Err(e) = session_write.encrypt_and_send(&[protocol::Headers::ABORT_FILE_TRANSFER]).await {
print_error!(e);
break;
}
@ -303,7 +310,7 @@ impl SessionManager {
local_file_handle = None;
}
}
if let Err(e) = session.encrypt_and_send(&[protocol::Headers::ACK_CHUNK]).await {
if let Err(e) = session_write.encrypt_and_send(&[protocol::Headers::ACK_CHUNK]).await {
print_error!(e);
break;
}
@ -319,7 +326,7 @@ impl SessionManager {
self.sessions.write().unwrap().get_mut(&session_id).unwrap().file_download = None;
local_file_path = None;
local_file_handle = None;
if let Err(e) = session.encrypt_and_send(&[protocol::Headers::ABORT_FILE_TRANSFER]).await {
if let Err(e) = session_write.encrypt_and_send(&[protocol::Headers::ABORT_FILE_TRANSFER]).await {
print_error!(e);
break;
}
@ -405,7 +412,7 @@ impl SessionManager {
SessionCommand::Send { buff } => {
//don't send msg if we already encrypted a file chunk (keep PSEC nonces synchronized)
if next_chunk.is_none() || aborted {
if let Err(e) = self.send_msg(session_id, &mut session, &buff, &mut aborted, file_ack_sender.as_ref()).await {
if let Err(e) = self.send_msg(session_id, &mut session_write, &buff, &mut aborted, file_ack_sender.as_ref()).await {
print_error!(e);
break;
}
@ -413,16 +420,16 @@ impl SessionManager {
msg_queue.push(buff);
}
}
SessionCommand::EncryptFileChunk { plain_text } => next_chunk = Some(session.encrypt(&plain_text)),
SessionCommand::EncryptFileChunk { plain_text } => next_chunk = Some(session_write.encrypt(&plain_text)),
SessionCommand::SendEncryptedFileChunk { sender } => {
if let Some(chunk) = next_chunk.as_ref() {
match session.socket_write(chunk).await {
match session_write.socket_write(chunk).await {
Ok(_) => {
file_ack_sender = Some(sender);
//once the pre-encrypted chunk is sent, we can send the pending messages
while msg_queue.len() > 0 {
let msg = msg_queue.remove(0);
if let Err(e) = self.send_msg(session_id, &mut session, &msg, &mut aborted, file_ack_sender.as_ref()).await {
if let Err(e) = self.send_msg(session_id, &mut session_write, &msg, &mut aborted, file_ack_sender.as_ref()).await {
print_error!(e);
break;
}

243
src/session_manager/session.rs
View File

@ -1,5 +1,5 @@
use std::{convert::TryInto, io::ErrorKind, net::IpAddr};
use tokio::{net::TcpStream, io::{AsyncReadExt, AsyncWriteExt}};
use tokio::{io::{AsyncReadExt, AsyncWriteExt}, net::{TcpStream, tcp::{OwnedReadHalf, OwnedWriteHalf}}};
use ed25519_dalek;
use ed25519_dalek::{ed25519::signature::Signature, Verifier, PUBLIC_KEY_LENGTH, SIGNATURE_LENGTH};
use x25519_dalek;
@ -16,6 +16,135 @@ const RANDOM_LEN: usize = 64;
const MESSAGE_LEN_LEN: usize = 4;
type MessageLenType = u32;
async fn socket_read<T: AsyncReadExt + Unpin>(reader: &mut T, buff: &mut [u8]) -> Result<usize, SessionError> {
match reader.read(buff).await {
Ok(read) => {
if read > 0 {
Ok(read)
} else {
Err(SessionError::BrokenPipe)
}
}
Err(e) => {
match e.kind() {
ErrorKind::ConnectionReset => Err(SessionError::ConnectionReset),
_ => {
print_error!("Receive error ({:?}): {}", e.kind(), e);
Err(SessionError::Unknown)
}
}
}
}
}
async fn socket_write<T: AsyncWriteExt + Unpin>(writer: &mut T, buff: &[u8]) -> Result<(), SessionError> {
match writer.write_all(buff).await {
Ok(_) => Ok(()),
Err(e) => Err(match e.kind() {
ErrorKind::BrokenPipe => SessionError::BrokenPipe,
ErrorKind::ConnectionReset => SessionError::ConnectionReset,
_ => {
print_error!("Send error ({:?}): {}", e.kind(), e);
SessionError::Unknown
}
})
}
}
fn pad(plain_text: &[u8]) -> Vec<u8> {
let encoded_msg_len = (plain_text.len() as MessageLenType).to_be_bytes();
let msg_len = plain_text.len()+encoded_msg_len.len();
let mut len = 1000;
while len < msg_len {
len *= 2;
}
let mut output = Vec::from(encoded_msg_len);
output.reserve(len);
output.extend(plain_text);
output.resize(len, 0);
OsRng.fill_bytes(&mut output[msg_len..]);
output
}
fn unpad(input: Vec<u8>) -> Vec<u8> {
let msg_len = MessageLenType::from_be_bytes(input[0..MESSAGE_LEN_LEN].try_into().unwrap()) as usize;
Vec::from(&input[MESSAGE_LEN_LEN..MESSAGE_LEN_LEN+msg_len])
}
fn encrypt(local_cipher: &Aes128Gcm, local_iv: &[u8], local_counter: &mut usize, plain_text: &[u8]) -> Vec<u8> {
let padded_msg = pad(plain_text);
let cipher_len = (padded_msg.len() as MessageLenType).to_be_bytes();
let payload = Payload {
msg: &padded_msg,
aad: &cipher_len
};
let nonce = iv_to_nonce(local_iv, local_counter);
let cipher_text = local_cipher.encrypt(Nonce::from_slice(&nonce), payload).unwrap();
[&cipher_len, cipher_text.as_slice()].concat()
}
pub async fn encrypt_and_send<T: AsyncWriteExt + Unpin>(writer: &mut T, local_cipher: &Aes128Gcm, local_iv: &[u8], local_counter: &mut usize, plain_text: &[u8]) -> Result<(), SessionError> {
let cipher_text = encrypt(local_cipher, local_iv, local_counter, plain_text);
socket_write(writer, &cipher_text).await
}
pub struct SessionRead {
read_half: OwnedReadHalf,
peer_cipher: Aes128Gcm,
peer_iv: [u8; IV_LEN],
peer_counter: usize,
}
impl SessionRead {
async fn socket_read(&mut self, buff: &mut [u8]) -> Result<usize, SessionError> {
socket_read(&mut self.read_half, buff).await
}
pub async fn receive_and_decrypt(mut self) -> Result<(SessionRead, Vec<u8>), SessionError> {
let mut message_len = [0; MESSAGE_LEN_LEN];
self.socket_read(&mut message_len).await?;
let recv_len = MessageLenType::from_be_bytes(message_len) as usize + AES_TAG_LEN;
if recv_len <= Session::MAX_RECV_SIZE {
let mut cipher_text = vec![0; recv_len];
let mut read = 0;
while read < recv_len {
read += self.socket_read(&mut cipher_text[read..]).await?;
}
let peer_nonce = iv_to_nonce(&self.peer_iv, &mut self.peer_counter);
let payload = Payload {
msg: &cipher_text,
aad: &message_len
};
match self.peer_cipher.decrypt(Nonce::from_slice(&peer_nonce), payload) {
Ok(plain_text) => Ok((self, unpad(plain_text))),
Err(_) => Err(SessionError::TransmissionCorrupted)
}
} else {
print_error!("Buffer too large: {} B", recv_len);
Err(SessionError::BufferTooLarge)
}
}
}
pub struct SessionWrite {
write_half: OwnedWriteHalf,
local_cipher: Aes128Gcm,
local_iv: [u8; IV_LEN],
local_counter: usize,
}
impl SessionWrite {
pub async fn encrypt_and_send(&mut self, plain_text: &[u8]) -> Result<(), SessionError> {
encrypt_and_send(&mut self.write_half, &self.local_cipher, &self.local_iv, &mut self.local_counter, plain_text).await
}
pub fn encrypt(&mut self, plain_text: &[u8]) -> Vec<u8> {
encrypt(&self.local_cipher, &self.local_iv, &mut self.local_counter, plain_text)
}
pub async fn socket_write(&mut self, cipher_text: &[u8]) -> Result<(), SessionError> {
socket_write(&mut self.write_half, cipher_text).await
}
}
pub struct Session {
stream: TcpStream,
handshake_sent_buff: Vec<u8>,
@ -48,43 +177,34 @@ impl Session {
}
}
pub fn into_spit(self) -> Option<(SessionRead, SessionWrite)> {
let (read_half, write_half) = self.stream.into_split();
Some((
SessionRead {
read_half,
peer_cipher: self.peer_cipher?,
peer_iv: self.peer_iv?,
peer_counter: self.peer_counter,
},
SessionWrite {
write_half,
local_cipher: self.local_cipher?,
local_iv: self.local_iv?,
local_counter: self.local_counter,
}
))
}
pub fn get_ip(&self) -> IpAddr {
self.stream.peer_addr().unwrap().ip()
}
async fn socket_read(&mut self, buff: &mut [u8]) -> Result<usize, SessionError> {
match self.stream.read(buff).await {
Ok(read) => {
if read > 0 {
Ok(read)
} else {
Err(SessionError::BrokenPipe)
}
}
Err(e) => {
match e.kind() {
ErrorKind::ConnectionReset => Err(SessionError::ConnectionReset),
_ => {
print_error!("Receive error ({:?}): {}", e.kind(), e);
Err(SessionError::Unknown)
}
}
}
}
socket_read(&mut self.stream, buff).await
}
pub async fn socket_write(&mut self, buff: &[u8]) -> Result<(), SessionError> {
match self.stream.write_all(buff).await {
Ok(_) => Ok(()),
Err(e) => Err(match e.kind() {
ErrorKind::BrokenPipe => SessionError::BrokenPipe,
ErrorKind::ConnectionReset => SessionError::ConnectionReset,
_ => {
print_error!("Send error ({:?}): {}", e.kind(), e);
SessionError::Unknown
}
})
}
socket_write(&mut self.stream, buff).await
}
async fn handshake_read(&mut self, buff: &mut [u8]) -> Result<(), SessionError> {
@ -194,66 +314,7 @@ impl Session {
Err(SessionError::TransmissionCorrupted)
}
fn random_pad(message: &[u8]) -> Vec<u8> {
let encoded_msg_len = (message.len() as MessageLenType).to_be_bytes();
let msg_len = message.len()+encoded_msg_len.len();
let mut len = 1000;
while len < msg_len {
len *= 2;
}
let mut output = Vec::from(encoded_msg_len);
output.reserve(len);
output.extend(message);
output.resize(len, 0);
OsRng.fill_bytes(&mut output[msg_len..]);
output
}
fn unpad(input: Vec<u8>) -> Vec<u8> {
let msg_len = MessageLenType::from_be_bytes(input[0..MESSAGE_LEN_LEN].try_into().unwrap()) as usize;
Vec::from(&input[MESSAGE_LEN_LEN..MESSAGE_LEN_LEN+msg_len])
}
pub fn encrypt(&mut self, message: &[u8]) -> Vec<u8> {
let padded_msg = Session::random_pad(message);
let cipher_len = (padded_msg.len() as MessageLenType).to_be_bytes();
let payload = Payload {
msg: &padded_msg,
aad: &cipher_len
};
let nonce = iv_to_nonce(&self.local_iv.unwrap(), &mut self.local_counter);
let cipher_text = self.local_cipher.as_ref().unwrap().encrypt(Nonce::from_slice(&nonce), payload).unwrap();
[&cipher_len, cipher_text.as_slice()].concat()
}
pub async fn encrypt_and_send(&mut self, message: &[u8]) -> Result<(), SessionError> {
let cipher_text = self.encrypt(message);
self.socket_write(&cipher_text).await
}
pub async fn receive_and_decrypt(&mut self) -> Result<Vec<u8>, SessionError> {
let mut message_len = [0; MESSAGE_LEN_LEN];
self.socket_read(&mut message_len).await?;
let recv_len = MessageLenType::from_be_bytes(message_len) as usize + AES_TAG_LEN;
if recv_len <= Session::MAX_RECV_SIZE {
let mut cipher_text = vec![0; recv_len];
let mut read = 0;
while read < recv_len {
read += self.socket_read(&mut cipher_text[read..]).await?;
}
let peer_nonce = iv_to_nonce(&self.peer_iv.unwrap(), &mut self.peer_counter);
let peer_cipher = self.peer_cipher.as_ref().unwrap();
let payload = Payload {
msg: &cipher_text,
aad: &message_len
};
match peer_cipher.decrypt(Nonce::from_slice(&peer_nonce), payload) {
Ok(plain_text) => Ok(Session::unpad(plain_text)),
Err(_) => Err(SessionError::TransmissionCorrupted)
}
} else {
print_error!("Buffer too large: {} B", recv_len);
Err(SessionError::BufferTooLarge)
}
pub async fn encrypt_and_send(&mut self, plain_text: &[u8]) -> Result<(), SessionError> {
encrypt_and_send(&mut self.stream, self.local_cipher.as_ref().unwrap(), self.local_iv.as_ref().unwrap(), &mut self.local_counter, plain_text).await
}
}