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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::io;
use std::sync::mpsc::{channel, RecvTimeoutError, Sender};
use std::time::Duration;
use crate::authenticatorservice::AuthenticatorTransport;
use crate::consts::PARAMETER_SIZE;
use crate::errors::*;
use crate::statecallback::StateCallback;
use crate::statemachine::StateMachine;
use runloop::RunLoop;
enum QueueAction {
Register {
flags: crate::RegisterFlags,
timeout: u64,
challenge: Vec<u8>,
application: crate::AppId,
key_handles: Vec<crate::KeyHandle>,
status: Sender<crate::StatusUpdate>,
callback: StateCallback<crate::Result<crate::RegisterResult>>,
},
Sign {
flags: crate::SignFlags,
timeout: u64,
challenge: Vec<u8>,
app_ids: Vec<crate::AppId>,
key_handles: Vec<crate::KeyHandle>,
status: Sender<crate::StatusUpdate>,
callback: StateCallback<crate::Result<crate::SignResult>>,
},
Cancel,
}
pub struct U2FManager {
queue: RunLoop,
tx: Sender<QueueAction>,
}
impl U2FManager {
pub fn new() -> io::Result<Self> {
let (tx, rx) = channel();
// Start a new work queue thread.
let queue = RunLoop::new(move |alive| {
let mut sm = StateMachine::new();
while alive() {
match rx.recv_timeout(Duration::from_millis(50)) {
Ok(QueueAction::Register {
flags,
timeout,
challenge,
application,
key_handles,
status,
callback,
}) => {
// This must not block, otherwise we can't cancel.
sm.register(
flags,
timeout,
challenge,
application,
key_handles,
status,
callback,
);
}
Ok(QueueAction::Sign {
flags,
timeout,
challenge,
app_ids,
key_handles,
status,
callback,
}) => {
// This must not block, otherwise we can't cancel.
sm.sign(
flags,
timeout,
challenge,
app_ids,
key_handles,
status,
callback,
);
}
Ok(QueueAction::Cancel) => {
// Cancelling must block so that we don't start a new
// polling thread before the old one has shut down.
sm.cancel();
}
Err(RecvTimeoutError::Disconnected) => {
break;
}
_ => { /* continue */ }
}
}
// Cancel any ongoing activity.
sm.cancel();
})?;
Ok(Self { queue, tx })
}
}
impl AuthenticatorTransport for U2FManager {
fn register(
&mut self,
flags: crate::RegisterFlags,
timeout: u64,
challenge: Vec<u8>,
application: crate::AppId,
key_handles: Vec<crate::KeyHandle>,
status: Sender<crate::StatusUpdate>,
callback: StateCallback<crate::Result<crate::RegisterResult>>,
) -> crate::Result<()> {
if challenge.len() != PARAMETER_SIZE || application.len() != PARAMETER_SIZE {
return Err(AuthenticatorError::InvalidRelyingPartyInput);
}
for key_handle in &key_handles {
if key_handle.credential.len() > 256 {
return Err(AuthenticatorError::InvalidRelyingPartyInput);
}
}
let action = QueueAction::Register {
flags,
timeout,
challenge,
application,
key_handles,
status,
callback,
};
Ok(self.tx.send(action)?)
}
fn sign(
&mut self,
flags: crate::SignFlags,
timeout: u64,
challenge: Vec<u8>,
app_ids: Vec<crate::AppId>,
key_handles: Vec<crate::KeyHandle>,
status: Sender<crate::StatusUpdate>,
callback: StateCallback<crate::Result<crate::SignResult>>,
) -> crate::Result<()> {
if challenge.len() != PARAMETER_SIZE {
return Err(AuthenticatorError::InvalidRelyingPartyInput);
}
if app_ids.is_empty() {
return Err(AuthenticatorError::InvalidRelyingPartyInput);
}
for app_id in &app_ids {
if app_id.len() != PARAMETER_SIZE {
return Err(AuthenticatorError::InvalidRelyingPartyInput);
}
}
for key_handle in &key_handles {
if key_handle.credential.len() > 256 {
return Err(AuthenticatorError::InvalidRelyingPartyInput);
}
}
let action = QueueAction::Sign {
flags,
timeout,
challenge,
app_ids,
key_handles,
status,
callback,
};
Ok(self.tx.send(action)?)
}
fn cancel(&mut self) -> crate::Result<()> {
Ok(self.tx.send(QueueAction::Cancel)?)
}
}
impl Drop for U2FManager {
fn drop(&mut self) {
self.queue.cancel();
}
}
|
