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Refuse to dial addresses via Tor that are almost certainly not reachable

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For now, this just concerns loopback addresses.
This commit is contained in:
Thomas Eizinger 2021-06-30 18:19:43 +10:00
parent ec59184e85
commit 92ed8d9c04
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GPG Key ID: 651AC83A6C6C8B96
1 changed files with 25 additions and 7 deletions
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32
swap/src/network/tor_transport.rs
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@ -35,17 +35,19 @@ impl Transport for TorDialOnlyTransport {
}
fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
let tor_compatible_address = TorCompatibleAddress::from_multiaddr(Cow::Borrowed(&addr))?;
let address = TorCompatibleAddress::from_multiaddr(Cow::Borrowed(&addr))?;
if address.is_certainly_not_reachable_via_tor_daemon() {
return Err(TransportError::MultiaddrNotSupported(addr));
}
let dial_future = async move {
tracing::trace!("Connecting through Tor proxy to address: {}", addr);
let stream = Socks5Stream::connect(
(Ipv4Addr::LOCALHOST, self.socks_port),
tor_compatible_address.to_string(),
)
.await
.map_err(|e| io::Error::new(io::ErrorKind::ConnectionRefused, e))?;
let stream =
Socks5Stream::connect((Ipv4Addr::LOCALHOST, self.socks_port), address.to_string())
.await
.map_err(|e| io::Error::new(io::ErrorKind::ConnectionRefused, e))?;
tracing::trace!("Connection through Tor established");
@ -99,6 +101,22 @@ impl TorCompatibleAddress {
_ => Err(TransportError::MultiaddrNotSupported(multi.into_owned())),
}
}
/// Checks if the address is reachable via the Tor daemon.
///
/// The Tor daemon can dial onion addresses, resolve DNS names and dial
/// IP4/IP6 addresses reachable via the public Internet.
/// We can't guarantee that an address is reachable via the Internet but we
/// can say that some addresses are almost certainly not reachable, for
/// example, loopback addresses.
fn is_certainly_not_reachable_via_tor_daemon(&self) -> bool {
match self {
TorCompatibleAddress::Onion3 { .. } => false,
TorCompatibleAddress::Dns { address, .. } => address == "localhost",
TorCompatibleAddress::Ip4 { address, .. } => address.is_loopback(),
TorCompatibleAddress::Ip6 { address, .. } => address.is_loopback(),
}
}
}
impl fmt::Display for TorCompatibleAddress {