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Monorepo for Tangled tangled.org
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218use std::collections::{HashMap, HashSet};use std::net::{IpAddr, SocketAddr};use std::sync::Arc;
use knot_runtime::{Clock, HttpTransport};use knot_types::{OfferedKey, OwnerRef};use russh::keys::ssh_key;use russh::server::{Auth, Handler, Msg, Server, Session};use russh::{Channel, ChannelId};use tokio_util::task::TaskTracker;
use crate::SshState;use crate::exec::run_exec;use crate::identity::{self, Asserted, Credential, Verdict};
pub(crate) struct KnotSshServer<H, C> { pub(crate) state: Arc<SshState<H, C>>, pub(crate) tracker: TaskTracker,}
impl<H: HttpTransport, C: Clock> Server for KnotSshServer<H, C> { type Handler = KnotSession<H, C>;
fn new_client(&mut self, peer: Option<SocketAddr>) -> Self::Handler { KnotSession::new( Arc::clone(&self.state), self.tracker.clone(), peer.map(|addr| addr.ip()), ) }}
pub(crate) struct KnotSession<H, C> { state: Arc<SshState<H, C>>, tracker: TaskTracker, credential: Option<Credential>, asserted: Option<Asserted>, channels: HashMap<ChannelId, Channel<Msg>>, protocols: HashSet<ChannelId>, peer: Option<IpAddr>,}
fn reject() -> Auth { Auth::Reject { proceed_with_methods: None, partial_success: false, }}
impl<H, C> KnotSession<H, C> { fn new(state: Arc<SshState<H, C>>, tracker: TaskTracker, peer: Option<IpAddr>) -> Self { Self { state, tracker, credential: None, asserted: None, channels: HashMap::new(), protocols: HashSet::new(), peer, } }}
impl<H: HttpTransport, C: Clock> KnotSession<H, C> { async fn decide( &mut self, user: &str, public_key: &ssh_key::PublicKey, ) -> Option<(Verdict, OfferedKey)> { let key = OfferedKey::from_bytes(public_key.to_bytes().ok()?); let verdict = identity::verify( &self.state, OwnerRef::parse(user), &key, self.peer, &mut self.asserted, ) .await; Some((verdict, key)) }}
impl<H: HttpTransport, C: Clock> Handler for KnotSession<H, C> { type Error = russh::Error;
async fn auth_publickey_offered( &mut self, user: &str, public_key: &ssh_key::PublicKey, ) -> Result<Auth, Self::Error> { match self.decide(user, public_key).await { Some((Verdict::Refused, _)) | None => Ok(reject()), Some(_) => Ok(Auth::Accept), } }
async fn auth_publickey( &mut self, user: &str, public_key: &ssh_key::PublicKey, ) -> Result<Auth, Self::Error> { match self.decide(user, public_key).await { Some((Verdict::Identified(did), _)) => { self.credential = Some(Credential::Identified(did)); Ok(Auth::Accept) } Some((Verdict::Offered, key)) => { self.credential = Some(Credential::Offered(key)); Ok(Auth::Accept) } Some((Verdict::Refused, _)) | None => Ok(reject()), } }
async fn channel_open_session( &mut self, channel: Channel<Msg>, _session: &mut Session, ) -> Result<bool, Self::Error> { self.channels.insert(channel.id(), channel); Ok(true) }
async fn env_request( &mut self, channel: ChannelId, variable_name: &str, variable_value: &str, _session: &mut Session, ) -> Result<(), Self::Error> { if variable_name == "GIT_PROTOCOL" && variable_value .split(':') .any(|token| token.trim() == "version=2") { self.protocols.insert(channel); } Ok(()) }
async fn channel_eof( &mut self, channel: ChannelId, _session: &mut Session, ) -> Result<(), Self::Error> { self.protocols.remove(&channel); Ok(()) }
async fn channel_close( &mut self, channel: ChannelId, _session: &mut Session, ) -> Result<(), Self::Error> { self.channels.remove(&channel); self.protocols.remove(&channel); Ok(()) }
#[allow(clippy::too_many_arguments)] async fn pty_request( &mut self, channel: ChannelId, _term: &str, _col_width: u32, _row_height: u32, _pix_width: u32, _pix_height: u32, _modes: &[(russh::Pty, u32)], session: &mut Session, ) -> Result<(), Self::Error> { session.channel_success(channel)?; Ok(()) }
async fn shell_request( &mut self, channel: ChannelId, session: &mut Session, ) -> Result<(), Self::Error> { let (Some(handle), Some(credential)) = (self.channels.remove(&channel), self.credential.clone()) else { session.channel_failure(channel)?; return Ok(()); }; session.channel_success(channel)?; let state = Arc::clone(&self.state); self.tracker.spawn(async move { crate::exec::run_greeting(state, credential, handle).await; }); Ok(()) }
async fn exec_request( &mut self, channel: ChannelId, data: &[u8], session: &mut Session, ) -> Result<(), Self::Error> { let (Some(handle), Some(credential)) = (self.channels.remove(&channel), self.credential.clone()) else { session.channel_failure(channel)?; return Ok(()); }; session.channel_success(channel)?; let protocol_v2 = self.protocols.remove(&channel); let state = Arc::clone(&self.state); let peer = self.peer; let command = data.to_vec(); self.tracker.spawn(async move { run_exec(state, credential, handle, &command, protocol_v2, peer).await; }); Ok(()) }}