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|
use mt_net::{CltSender, SenderExt, ToCltPkt, ToSrvPkt};
use rand::RngCore;
use sha2::Sha256;
use srp::{client::SrpClient, groups::G_2048};
use std::time::Duration;
use tokio::time::{interval, Interval};
enum AuthState {
Init(ToSrvPkt, Interval),
Verify(Vec<u8>, SrpClient<'static, Sha256>),
Done(bool),
}
pub struct Auth {
tx: CltSender,
state: AuthState,
username: String,
password: String,
lang: String,
}
impl Auth {
pub fn new(
tx: CltSender,
username: impl Into<String>,
password: impl Into<String>,
lang: impl Into<String>,
) -> Self {
let username = username.into();
Self {
tx,
state: AuthState::Init(
ToSrvPkt::Init {
serialize_version: 29,
proto_version: 40..=40,
player_name: username.clone(),
send_full_item_meta: false,
},
interval(Duration::from_millis(100)),
),
username,
password: password.into(),
lang: lang.into(),
}
}
pub fn username(&self) -> &str {
&self.username
}
pub fn password(&self) -> &str {
&self.password
}
pub fn lang(&self) -> &str {
&self.lang
}
pub fn mut_init_pkt(&mut self) -> Option<&mut ToSrvPkt> {
if let AuthState::Init(pkt, _) = &mut self.state {
Some(pkt)
} else {
None
}
}
pub async fn poll(&mut self) {
match &mut self.state {
AuthState::Init(pkt, interval) => {
loop {
// cancel safety: since init pkt is unreliable, cancelation is not an issue
self.tx.send(pkt).await.unwrap();
interval.tick().await;
}
}
AuthState::Verify(_, _) | AuthState::Done(false) => futures::future::pending().await,
AuthState::Done(unconsumed) => {
*unconsumed = false;
}
}
}
pub async fn handle_pkt(&mut self, pkt: &ToCltPkt) {
use ToCltPkt::*;
match pkt {
Hello {
auth_methods,
username: name,
..
} => {
use mt_net::AuthMethod;
if !matches!(self.state, AuthState::Init(_, _)) {
return;
}
let srp = SrpClient::<Sha256>::new(&G_2048);
let mut rand_bytes = vec![0; 32];
rand::thread_rng().fill_bytes(&mut rand_bytes);
if &self.username != name {
panic!("username changed");
}
if auth_methods.contains(AuthMethod::FirstSrp) {
let verifier = srp.compute_verifier(
self.username.to_lowercase().as_bytes(),
self.password.as_bytes(),
&rand_bytes,
);
self.tx
.send(&ToSrvPkt::FirstSrp {
salt: rand_bytes,
verifier,
empty_passwd: self.password.is_empty(),
})
.await
.unwrap();
self.state = AuthState::Done(false);
} else if auth_methods.contains(AuthMethod::Srp) {
let a = srp.compute_public_ephemeral(&rand_bytes);
self.tx
.send(&ToSrvPkt::SrpBytesA { a, no_sha1: true })
.await
.unwrap();
self.state = AuthState::Verify(rand_bytes, srp);
} else {
panic!("unsupported auth methods: {auth_methods:?}");
}
}
SrpBytesSaltB { salt, b } => {
if let AuthState::Verify(a, srp) = &self.state {
let m = srp
.process_reply(
a,
self.username.to_lowercase().as_bytes(),
self.password.as_bytes(),
salt,
b,
)
.unwrap()
.proof()
.into();
self.tx.send(&ToSrvPkt::SrpBytesM { m }).await.unwrap();
self.state = AuthState::Done(false);
}
}
AcceptAuth { .. } => {
self.tx
.send(&ToSrvPkt::Init2 {
lang: self.lang.clone(),
})
.await
.unwrap();
self.state = AuthState::Done(true);
}
_ => {}
}
}
}
|
