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|
use std::mem;
use std::sync::mpsc::Receiver;
use std::sync::{Arc, Weak};
use futures::sync::oneshot;
use futures::*;
use log::debug;
use ring::aead::{Aad, LessSafeKey, Nonce, UnboundKey, CHACHA20_POLY1305};
use zerocopy::{AsBytes, LayoutVerified};
use super::device::DecryptionState;
use super::device::DeviceInner;
use super::messages::TransportHeader;
use super::peer::PeerInner;
use super::types::Callbacks;
use super::super::types::{Bind, Tun};
#[derive(PartialEq, Debug)]
pub enum Operation {
Encryption,
Decryption,
}
pub struct JobBuffer {
pub msg: Vec<u8>, // message buffer (nonce and receiver id set)
pub key: [u8; 32], // chacha20poly1305 key
pub okay: bool, // state of the job
pub op: Operation, // should be buffer be encrypted / decrypted?
}
pub type JobParallel = (oneshot::Sender<JobBuffer>, JobBuffer);
pub type JobInbound<C, T, B> = (Weak<DecryptionState<C, T, B>>, oneshot::Receiver<JobBuffer>);
pub type JobOutbound = oneshot::Receiver<JobBuffer>;
pub fn worker_inbound<C: Callbacks, T: Tun, B: Bind>(
device: Arc<DeviceInner<C, T, B>>, // related device
peer: Arc<PeerInner<C, T, B>>, // related peer
receiver: Receiver<JobInbound<C, T, B>>,
) {
/*
fn inner<C: Callbacks, T: Tun, B: Bind>(
device: &Arc<DeviceInner<C, T, B>>,
peer: &Arc<PeerInner<C, T, B>>,
) {
// wait for job to complete
loop {
match buf.try_lock() {
None => (),
Some(buf) => match buf.status {
Status::Fault => break (),
Status::Done => {
// parse / cast
let (header, packet) = match LayoutVerified::new_from_prefix(&buf.msg[..]) {
Some(v) => v,
None => continue,
};
let header: LayoutVerified<&[u8], TransportHeader> = header;
// obtain strong reference to decryption state
let state = if let Some(state) = state.upgrade() {
state
} else {
break;
};
// check for replay
if !state.protector.lock().update(header.f_counter.get()) {
break;
}
// check for confirms key
if !state.confirmed.swap(true, Ordering::SeqCst) {
peer.confirm_key(state.keypair.clone());
}
// update endpoint, TODO
// write packet to TUN device, TODO
// trigger callback
debug_assert!(
packet.len() >= CHACHA20_POLY1305.nonce_len(),
"this should be checked earlier in the pipeline"
);
(device.call_recv)(
&peer.opaque,
packet.len() > CHACHA20_POLY1305.nonce_len(),
true,
);
break;
}
_ => (),
},
};
// default is to park
thread::park()
}
}
*/
}
pub fn worker_outbound<C: Callbacks, T: Tun, B: Bind>(
device: Arc<DeviceInner<C, T, B>>, // related device
peer: Arc<PeerInner<C, T, B>>, // related peer
receiver: Receiver<JobOutbound>,
) {
loop {
// fetch job
let rx = match receiver.recv() {
Ok(v) => v,
_ => {
return;
}
};
// wait for job to complete
let _ = rx
.map(|buf| {
if buf.okay {
// write to UDP device, TODO
let xmit = false;
// trigger callback
(device.call_send)(
&peer.opaque,
buf.msg.len()
> CHACHA20_POLY1305.nonce_len() + mem::size_of::<TransportHeader>(),
xmit,
);
}
})
.wait();
}
}
pub fn worker_parallel(receiver: Receiver<JobParallel>) {
loop {
// fetch next job
let (tx, mut buf) = match receiver.recv() {
Err(_) => {
return;
}
Ok(val) => val,
};
// cast and check size of packet
let (header, packet) = match LayoutVerified::new_from_prefix(&buf.msg[..]) {
Some(v) => v,
None => continue,
};
if packet.len() < CHACHA20_POLY1305.nonce_len() {
continue;
}
let header: LayoutVerified<&[u8], TransportHeader> = header;
// do the weird ring AEAD dance
let key = LessSafeKey::new(UnboundKey::new(&CHACHA20_POLY1305, &buf.key[..]).unwrap());
// create a nonce object
let mut nonce = [0u8; 12];
debug_assert_eq!(nonce.len(), CHACHA20_POLY1305.nonce_len());
nonce[4..].copy_from_slice(header.f_counter.as_bytes());
let nonce = Nonce::assume_unique_for_key(nonce);
match buf.op {
Operation::Encryption => {
debug!("worker, process encryption");
// note: extends the vector to accommodate the tag
key.seal_in_place_append_tag(nonce, Aad::empty(), &mut buf.msg)
.unwrap();
buf.okay = true;
}
Operation::Decryption => {
debug!("worker, process decryption");
// opening failure is signaled by fault state
buf.okay = match key.open_in_place(nonce, Aad::empty(), &mut buf.msg) {
Ok(_) => true,
Err(_) => false,
};
}
}
// pass ownership to consumer
let _ = tx.send(buf);
}
}
|
