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XXX: ESock doesn"t work! :/ The first encrypted write/read succeeds, but any subsequent calls to write/read produce garbage...

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Fortune for rsh's current commit: Future blessing − 末吉
master
Avril 3 years ago
parent 20bf0f1649
commit e5fce0a045
Signed by: flanchan
GPG Key ID: 284488987C31F630
1 changed files with 299 additions and 50 deletions
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349
src/sock/enc.rs
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@ -210,7 +210,7 @@ impl<W: AsyncWrite, R: AsyncRead> ESock<W, R>
}
/// Is the Write + Read operation encrypted? Tuple is `(Tx, Rx)`.
pub fn is_encrypted(&self) -> (bool, bool)
#[inline] pub fn is_encrypted(&self) -> (bool, bool)
{
(self.state.encw, self.state.encr)
}
@ -254,10 +254,10 @@ impl<W: AsyncWrite, R: AsyncRead> ESock<W, R>
/// It is also more efficient to `set_encrypted_write/read(true)` on `ESock` than it is on the halves, but changinc encryption modes on halves is still possible.
pub fn split(self) -> (ESockWriteHalf<W>, ESockReadHalf<R>)
{
let arced = Arc::new((self.info, RwLock::new(self.state)));
let arced = Arc::new(self.info);
(ESockWriteHalf(Arc::clone(&arced), self.tx),
ESockReadHalf(arced, self.rx))
(ESockWriteHalf(Arc::clone(&arced), self.tx, self.state.encw),
ESockReadHalf(arced, self.rx, self.state.encr))
}
/// Merge a previously split `ESock` into a single one again.
@ -270,7 +270,7 @@ impl<W: AsyncWrite, R: AsyncRead> ESock<W, R>
#[inline(never)]
fn _panic_ptr_ineq() -> !
{
panic!("Cannot merge halves of different sockets")
panic!("Cannot merge halves split from different sources")
}
if !Arc::ptr_eq(&txh.0, &rxh.0) {
_panic_ptr_ineq();
@ -278,17 +278,63 @@ impl<W: AsyncWrite, R: AsyncRead> ESock<W, R>
let tx = txh.1;
drop(txh.0);
let (info, lstate) = Arc::try_unwrap(rxh.0).unwrap();
let info = Arc::try_unwrap(rxh.0).unwrap();
let rx = rxh.1;
Self {
state: lstate.into_inner(),
state: ESockState {
encw: txh.2,
encr: rxh.2,
},
info,
tx, rx
}
}
}
async fn set_encrypted_write_for<T: AsyncWrite + Unpin>(info: &ESockInfo, tx: &mut AsyncSink<T>) -> eyre::Result<()>
{
use tokio::prelude::*;
let session_key = ESockSessionKey::generate();
let data = {
let them = info.them.as_ref().expect("Cannot set encrypted write when keys have not been exchanged");
session_key.to_ciphertext(them)
.wrap_err(eyre!("Failed to encrypt session key with foreign endpoint's key"))
.with_section(|| session_key.to_string().header("Session key was"))
.with_section(|| them.to_string().header("Foreign pubkey was"))?
};
let crypter = session_key.to_encrypter()
.wrap_err(eyre!("Failed to create encryption device from session key for Tx"))
.with_section(|| session_key.to_string().header("Session key was"))?;
// Send rsa `data` over unencrypted endpoint
tx.inner_mut().write_all(&data[..]).await
.wrap_err(eyre!("Failed to write ciphertext to endpoint"))
.with_section(|| data.to_base64_string().header("Ciphertext of session key was"))?;
// Set crypter of `tx` to `session_key`.
*tx.crypter_mut() = crypter;
Ok(())
}
async fn set_encrypted_read_for<T: AsyncRead + Unpin>(info: &ESockInfo, rx: &mut AsyncSource<T>) -> eyre::Result<()>
{
use tokio::prelude::*;
let mut data = [0u8; RSA_CIPHERTEXT_SIZE];
// Read `data` from unencrypted endpoint
rx.inner_mut().read_exact(&mut data[..]).await
.wrap_err(eyre!("Failed to read ciphertext from endpoint"))?;
// Decrypt `data`
let session_key = ESockSessionKey::from_ciphertext(&data, &info.us)
.wrap_err(eyre!("Failed to decrypt session key from ciphertext"))
.with_section(|| data.to_base64_string().header("Ciphertext was"))
.with_section(|| info.us.to_string().header("Our RSA key is"))?;
// Set crypter of `rx` to `session_key`.
*rx.crypter_mut() = session_key.to_decrypter()
.wrap_err(eyre!("Failed to create decryption device from session key for Rx"))
.with_section(|| session_key.to_string().header("Decrypted session key was"))?;
Ok(())
}
impl<W: AsyncWrite+ Unpin, R: AsyncRead + Unpin> ESock<W, R>
{
/// Get the Tx and Rx of the stream.
@ -308,28 +354,10 @@ impl<W: AsyncWrite+ Unpin, R: AsyncRead + Unpin> ESock<W, R>
})
}
/// Enable write encryption
//TODO: Implement this also for write half
pub async fn set_encrypted_write(&mut self, set: bool) -> eyre::Result<()>
{
use tokio::prelude::*;
if set {
let session_key = ESockSessionKey::generate();
let data = {
let them = self.info.them.as_ref().expect("Cannot set encrypted write when keys have not been exchanged");
session_key.to_ciphertext(them)
.wrap_err(eyre!("Failed to encrypt session key with foreign endpoint's key"))
.with_section(|| session_key.to_string().header("Session key was"))
.with_section(|| them.to_string().header("Foreign pubkey was"))?
};
let crypter = session_key.to_encrypter()
.wrap_err(eyre!("Failed to create encryption device from session key for Tx"))
.with_section(|| session_key.to_string().header("Session key was"))?;
// Send rsa `data` over unencrypted endpoint
self.unencrypted().0.write_all(&data[..]).await
.wrap_err(eyre!("Failed to write ciphertext to endpoint"))
.with_section(|| data.to_base64_string().header("Ciphertext of session key was"))?;
// Set crypter of `tx` to `session_key`.
*self.tx.crypter_mut() = crypter;
set_encrypted_write_for(&self.info, &mut self.tx).await?;
// Set `encw` to true
self.state.encw = true;
Ok(())
@ -342,29 +370,14 @@ impl<W: AsyncWrite+ Unpin, R: AsyncRead + Unpin> ESock<W, R>
/// Enable read encryption
///
/// The other endpoint must have sent a `set_encrypted_write()`
//TODO: Implement this also for read half
pub async fn set_encrypted_read(&mut self, set: bool) -> eyre::Result<()>
{
use tokio::prelude::*;
if set {
let mut data = [0u8; RSA_CIPHERTEXT_SIZE];
// Read `data` from unencrypted endpoint
self.unencrypted().1.read_exact(&mut data[..]).await
.wrap_err(eyre!("Failed to read ciphertext from endpoint"))?;
// Decrypt `data`
let session_key = ESockSessionKey::from_ciphertext(&data, &self.info.us)
.wrap_err(eyre!("Failed to decrypt session key from ciphertext"))
.with_section(|| data.to_base64_string().header("Ciphertext was"))
.with_section(|| self.info.us.to_string().header("Our RSA key is"))?;
// Set crypter of `rx` to `session_key`.
*self.rx.crypter_mut() = session_key.to_decrypter()
.wrap_err(eyre!("Failed to create decryption device from session key for Rx"))
.with_section(|| session_key.to_string().header("Decrypted session key was"))?;
set_encrypted_read_for(&self.info, &mut self.rx).await?;
// Set `encr` to true
self.state.encr = true;
Ok(())
} else {
self.state.encr = false;
Ok(())
}
@ -448,11 +461,13 @@ impl<W: AsyncWrite+ Unpin, R: AsyncRead + Unpin> ESock<W, R>
}
}
//XXXXXXX: This isn't working. The first write to the socket succeeds. Any subsequent writes/reads produce garbage. Why?
impl<W, R> AsyncWrite for ESock<W, R>
where W: AsyncWrite
{
fn poll_write(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8]) -> Poll<Result<usize, io::Error>> {
//XXX: If the encryption state of the socket is changed between polls, this breaks. Idk if we can do anything about that tho.
//XXX: If the encryption state of the socket is changed between polls, this breaks. Idk if we can do anything about that tho.
if self.state.encw {
self.project().tx.poll_write(cx, buf)
} else {
@ -489,16 +504,160 @@ where R: AsyncRead
/// Write half for `ESock`.
#[pin_project]
#[derive(Debug)]
pub struct ESockWriteHalf<W>(Arc<(ESockInfo, RwLock<ESockState>)>, #[pin] AsyncSink<W>);
pub struct ESockWriteHalf<W>(Arc<ESockInfo>, #[pin] AsyncSink<W>, bool);
/// Read half for `ESock`.
#[pin_project]
#[derive(Debug)]
pub struct ESockReadHalf<R>(Arc<(ESockInfo, RwLock<ESockState>)>, #[pin] AsyncSource<R>);
pub struct ESockReadHalf<R>(Arc<ESockInfo>, #[pin] AsyncSource<R>, bool);
//Impl AsyncRead/Write + set_encrypted_read/write for ESockRead/WriteHalf.
impl<W: AsyncWrite> ESockWriteHalf<W>
{
/// Does this write half have a live corresponding read half?
///
/// It's not required to have one, however, exchange is not possible without since it requires sticking the halves back together.
pub fn is_bidirectional(&self) -> bool
{
Arc::strong_count(&self.0) > 1
}
/// Is write encrypted on this half?
#[inline(always)] pub fn is_encrypted(&self) -> bool
{
self.2
}
/// The local RSA private key
#[inline] pub fn local_key(&self) -> &RsaPrivateKey
{
&self.0.us
}
/// THe remote RSA public key (if exchange has happened.)
#[inline] pub fn foreign_key(&self) -> Option<&RsaPublicKey>
{
self.0.them.as_ref()
}
/// End an encrypted session syncronously.
///
/// Same as calling `set_encryption(false).now_or_never()`, but more efficient.
pub fn clear_encryption(&mut self)
{
self.2 = false;
}
}
impl<R: AsyncRead> ESockReadHalf<R>
{
/// Does this read half have a live corresponding write half?
///
/// It's not required to have one, however, exchange is not possible without since it requires sticking the halves back together.
pub fn is_bidirectional(&self) -> bool
{
Arc::strong_count(&self.0) > 1
}
/// Is write encrypted on this half?
#[inline(always)] pub fn is_encrypted(&self) -> bool
{
self.2
}
/// The local RSA private key
#[inline] pub fn local_key(&self) -> &RsaPrivateKey
{
&self.0.us
}
/// THe remote RSA public key (if exchange has happened.)
#[inline] pub fn foreign_key(&self) -> Option<&RsaPublicKey>
{
self.0.them.as_ref()
}
/// End an encrypted session syncronously.
///
/// Same as calling `set_encryption(false).now_or_never()`, but more efficient.
pub fn clear_encryption(&mut self)
{
self.2 = false;
}
}
impl<W: AsyncWrite + Unpin> ESockWriteHalf<W>
{
/// Begin or end an encrypted writing session
pub async fn set_encryption(&mut self, set: bool) -> eyre::Result<()>
{
if set {
set_encrypted_write_for(&self.0, &mut self.1).await?;
self.2 = true;
} else {
self.2 = false;
}
Ok(())
}
}
impl<R: AsyncRead + Unpin> ESockReadHalf<R>
{
/// Begin or end an encrypted reading session
pub async fn set_encryption(&mut self, set: bool) -> eyre::Result<()>
{
if set {
set_encrypted_read_for(&self.0, &mut self.1).await?;
self.2 = true;
} else {
self.2 = false;
}
Ok(())
}
}
impl<W: AsyncWrite> AsyncWrite for ESockWriteHalf<W>
{
fn poll_write(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8]) -> Poll<Result<usize, io::Error>> {
if self.2 {
// Encrypted
self.project().1.poll_write(cx, buf)
} else {
// Unencrypted
// SAFETY: Uhh... well I think this is fine? Because we can project the container.
// TODO: Can we project the `tx`? Or maybe add a method in `AsyncSink` to map a pinned sink to a `Pin<&mut W>`?
unsafe { self.map_unchecked_mut(|this| this.1.inner_mut()).poll_write(cx, buf)}
}
}
#[inline(always)] fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
self.project().1.poll_flush(cx)
}
#[inline(always)] fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
self.project().1.poll_flush(cx)
}
}
impl<R: AsyncRead> AsyncRead for ESockReadHalf<R>
{
fn poll_read(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut [u8]) -> Poll<io::Result<usize>> {
if self.2 {
// Encrypted
self.project().1.poll_read(cx, buf)
} else {
// Unencrypted
// SAFETY: Uhh... well I think this is fine? Because we can project the container.
// TODO: Can we project the `tx`? Or maybe add a method in `AsyncSink` to map a pinned sink to a `Pin<&mut W>`?
unsafe { self.map_unchecked_mut(|this| this.1.inner_mut()).poll_read(cx, buf)}
}
}
}
#[cfg(test)]
mod tests
{
use super::ESock;
#[test]
fn rsa_ciphertext_len() -> crate::eyre::Result<()>
{
@ -539,6 +698,16 @@ mod tests
Ok(())
}
fn gen_duplex_esock(bufsz: usize) -> crate::eyre::Result<(ESock<tokio::io::DuplexStream, tokio::io::DuplexStream>, ESock<tokio::io::DuplexStream, tokio::io::DuplexStream>)>
{
use crate::*;
let (atx, brx) = tokio::io::duplex(bufsz);
let (btx, arx) = tokio::io::duplex(bufsz);
let tx = ESock::new(atx, arx).wrap_err(eyre!("Failed to create TX"))?;
let rx = ESock::new(btx, brx).wrap_err(eyre!("Failed to create RX"))?;
Ok((tx, rx))
}
#[tokio::test]
async fn esock_exchange() -> crate::eyre::Result<()>
{
@ -546,10 +715,9 @@ mod tests
const VALUE: &'static [u8] = b"Hello world!";
let (atx, brx) = tokio::io::duplex(super::TRANS_KEY_MAX_SIZE * 4);
let (btx, arx) = tokio::io::duplex(super::TRANS_KEY_MAX_SIZE * 4);
let mut tx = super::ESock::new(atx, arx)?;
let mut rx = super::ESock::new(btx, brx)?;
// The duplex buffer size here is smaller than an RSA ciphertext block. So, writing the session key must be buffered with a buffer size this small (should return Pending at least once.)
// Using a low buffer size to make sure the test passes even when the entire buffer cannot be written at once.
let (mut tx, mut rx) = gen_duplex_esock(256).wrap_err(eyre!("Failed to weave socks"))?;
let writer = tokio::spawn(async move {
use tokio::prelude::*;
@ -560,7 +728,9 @@ mod tests
tx.set_encrypted_write(true).await?;
assert_eq!((true, false), tx.is_encrypted());
tx.write_all(VALUE).await?;
tx.write_all(&VALUE[0..2]).await?;
tx.write_all(&VALUE[2..6]).await?;
tx.write_all(&VALUE[6..]).await?;
// Check resp
tx.set_encrypted_read(true).await?;
@ -616,4 +786,83 @@ mod tests
assert_eq!(&val, VALUE);
Ok(())
}
#[tokio::test]
async fn esock_split() -> crate::eyre::Result<()>
{
use super::*;
const SLICES: &'static [&'static [u8]] = &[
&[1,5,3,7,6,9,100,0],
&[7,6,2,90],
&[3,6,1,0],
&[5,1,3,3],
];
let result = SLICES.iter().map(|&slice| slice.iter().map(|&b| u64::from(b)).sum::<u64>()).sum::<u64>();
println!("Result: {}", result);
let (mut tx, mut rx) = gen_duplex_esock(super::TRANS_KEY_MAX_SIZE * 4).wrap_err(eyre!("Failed to weave socks"))?;
let (writer, reader) = {
use tokio::prelude::*;
let writer = tokio::spawn(async move {
tx.exchange().await?;
let (mut tx, mut rx) = tx.split();
//tx.set_encryption(true).await?;
let slices = &SLICES[1..];
for &slice in slices.iter()
{
println!("Writing slice: {:?}", slice);
tx.write_all(slice).await?;
}
//let mut tx = ESock::unsplit(tx, rx);
tx.write_all(SLICES[0]).await?;
Result::<_, eyre::Report>::Ok(())
});
let reader = tokio::spawn(async move {
rx.exchange().await?;
let (mut tx, mut rx) = rx.split();
//rx.set_encryption(true).await?;
let (mut mtx, mut mrx) = tokio::sync::mpsc::channel::<Vec<u8>>(16);
let sorter = tokio::spawn(async move {
let mut done = 0u64;
while let Some(buf) = mrx.recv().await
{
//buf.sort();
done += buf.iter().map(|&b| u64::from(b)).sum::<u64>();
println!("Got buffer: {:?}", buf);
tx.write_all(&buf).await?;
}
Result::<_, eyre::Report>::Ok(done)
});
let mut buffer = [0u8; 16];
while let Ok(read) = rx.read(&mut buffer[..]).await
{
if read == 0 {
break;
}
mtx.send(Vec::from(&buffer[..read])).await?;
}
drop(mtx);
let sum = sorter.await.expect("(reader) Sorter task panic")?;
Result::<_, eyre::Report>::Ok(sum)
});
let (writer, reader) = tokio::join![writer, reader];
(writer.expect("Writer task panic"),
reader.expect("Reader task panic"))
};
writer?;
assert_eq!(result, reader?);
Ok(())
}
}

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