Add test for remote custom SOCKS5 bridge

Author: dlon

test/test-manager/src/tests/tunnel.rs

@@ -6,11 +6,15 @@ use crate::network_monitor::{start_packet_monitor, MonitorOptions};
 
 use mullvad_management_interface::MullvadProxyClient;
 use mullvad_types::relay_constraints::{
-    self, BridgeSettings, Constraint, OpenVpnConstraints, RelayConstraints, RelaySettings,
-    SelectedObfuscation, TransportPort, Udp2TcpObfuscationSettings, WireguardConstraints,
+    self, BridgeConstraints, BridgeSettings, BridgeType, Constraint, OpenVpnConstraints,
+    RelayConstraints, RelaySettings, SelectedObfuscation, TransportPort,
+    Udp2TcpObfuscationSettings, WireguardConstraints,
 };
 use mullvad_types::wireguard;
-use talpid_types::net::{TransportProtocol, TunnelType};
+use talpid_types::net::{
+    proxy::{CustomProxy, Socks5Remote},
+    TransportProtocol, TunnelType,
+};
 use test_macro::test_function;
 use test_rpc::meta::Os;
 use test_rpc::mullvad_daemon::ServiceStatus;
@@ -571,3 +575,94 @@ pub async fn test_quantum_resistant_multihop_udp2tcp_tunnel(
 
     Ok(())
 }
+
+/// Try to connect to an OpenVPN relay via a remote, passwordless SOCKS5 server.
+/// * No outgoing traffic to the bridge/entry relay is observed from the SUT.
+/// * The conncheck reports an unexpected exit relay.
+#[test_function]
+pub async fn test_remote_socks_bridge(
+    _: TestContext,
+    rpc: ServiceClient,
+    mut mullvad_client: MullvadProxyClient,
+) -> Result<(), Error> {
+    mullvad_client
+        .set_bridge_state(relay_constraints::BridgeState::On)
+        .await
+        .expect("failed to enable bridge mode");
+
+    mullvad_client
+        .set_bridge_settings(BridgeSettings {
+            bridge_type: BridgeType::Custom,
+            normal: BridgeConstraints::default(),
+            custom: Some(CustomProxy::Socks5Remote(Socks5Remote::new((
+                crate::vm::network::NON_TUN_GATEWAY,
+                crate::vm::network::SOCKS5_PORT,
+            )))),
+        })
+        .await
+        .expect("failed to update bridge settings");
+
+    set_relay_settings(
+        &mut mullvad_client,
+        RelaySettings::Normal(RelayConstraints {
+            tunnel_protocol: Constraint::Only(TunnelType::OpenVpn),
+            ..Default::default()
+        }),
+    )
+    .await
+    .expect("failed to update relay settings");
+
+    //
+    // Connect to VPN
+    //
+
+    connect_and_wait(&mut mullvad_client).await?;
+
+    let (entry, exit) = match mullvad_client.get_tunnel_state().await? {
+        mullvad_types::states::TunnelState::Connected { endpoint, .. } => {
+            (endpoint.proxy.unwrap().endpoint, endpoint.endpoint)
+        }
+        actual => {
+            panic!("unexpected tunnel state. Expected `TunnelState::Connected` but got {actual:?}")
+        }
+    };
+
+    log::info!(
+        "Selected entry bridge {entry_addr} & exit relay {exit_addr}",
+        entry_addr = entry.address,
+        exit_addr = exit.address
+    );
+
+    // Start recording outgoing packets. Their destination will be verified
+    // against the bridge's IP address later.
+    let monitor = start_packet_monitor(
+        move |packet| packet.destination.ip() == entry.address.ip(),
+        MonitorOptions::default(),
+    )
+    .await;
+
+    //
+    // Verify exit IP
+    //
+
+    log::info!("Verifying exit server");
+
+    assert!(
+        helpers::using_mullvad_exit(&rpc).await,
+        "expected Mullvad exit IP"
+    );
+
+    //
+    // Verify entry IP
+    //
+
+    log::info!("Verifying entry server");
+
+    let monitor_result = monitor.into_result().await.unwrap();
+    assert!(
+        !monitor_result.packets.is_empty(),
+        "detected no traffic to entry server",
+    );
+
+    Ok(())
+}