Merge pull request #1541 from nybidari:iptables

PiperOrigin-RevId: 290273561

6 files changed, 323 insertions, 1 deletions

diff --git a/test/iptables/BUILD b/test/iptables/BUILD
index fa833c3b2..372ba7abf 100644
--- a/test/iptables/BUILD
+++ b/test/iptables/BUILD
@@ -6,8 +6,10 @@ go_library(
     name = "iptables",
     srcs = [
         "filter_input.go",
+        "filter_output.go",
         "iptables.go",
         "iptables_util.go",
+        "nat.go",
     ],
     importpath = "gvisor.dev/gvisor/test/iptables",
     visibility = ["//test/iptables:__subpackages__"],
diff --git a/test/iptables/filter_input.go b/test/iptables/filter_input.go
index 923f44e68..4b8bbb093 100644
--- a/test/iptables/filter_input.go
+++ b/test/iptables/filter_input.go
@@ -31,6 +31,8 @@ func init() {
 	RegisterTestCase(FilterInputDropUDP{})
 	RegisterTestCase(FilterInputDropUDPPort{})
 	RegisterTestCase(FilterInputDropDifferentUDPPort{})
+	RegisterTestCase(FilterInputDropTCPDestPort{})
+	RegisterTestCase(FilterInputDropTCPSrcPort{})
 }
 
 // FilterInputDropUDP tests that we can drop UDP traffic.
@@ -122,3 +124,65 @@ func (FilterInputDropDifferentUDPPort) ContainerAction(ip net.IP) error {
 func (FilterInputDropDifferentUDPPort) LocalAction(ip net.IP) error {
 	return sendUDPLoop(ip, acceptPort, sendloopDuration)
 }
+
+// FilterInputDropTCPDestPort tests that connections are not accepted on specified source ports.
+type FilterInputDropTCPDestPort struct{}
+
+// Name implements TestCase.Name.
+func (FilterInputDropTCPDestPort) Name() string {
+	return "FilterInputDropTCPDestPort"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterInputDropTCPDestPort) ContainerAction(ip net.IP) error {
+	if err := filterTable("-A", "INPUT", "-p", "tcp", "-m", "tcp", "--dport", fmt.Sprintf("%d", dropPort), "-j", "DROP"); err != nil {
+		return err
+	}
+
+	// Listen for TCP packets on drop port.
+	if err := listenTCP(dropPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection on port %d should not be accepted, but got accepted", dropPort)
+	}
+
+	return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterInputDropTCPDestPort) LocalAction(ip net.IP) error {
+	if err := connectTCP(ip, dropPort, acceptPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection destined to port %d should not be accepted, but got accepted", dropPort)
+	}
+
+	return nil
+}
+
+// FilterInputDropTCPSrcPort tests that connections are not accepted on specified source ports.
+type FilterInputDropTCPSrcPort struct{}
+
+// Name implements TestCase.Name.
+func (FilterInputDropTCPSrcPort) Name() string {
+	return "FilterInputDropTCPSrcPort"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterInputDropTCPSrcPort) ContainerAction(ip net.IP) error {
+	if err := filterTable("-A", "INPUT", "-p", "tcp", "-m", "tcp", "--sport", fmt.Sprintf("%d", dropPort), "-j", "DROP"); err != nil {
+		return err
+	}
+
+	// Listen for TCP packets on accept port.
+	if err := listenTCP(acceptPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection destined to port %d should not be accepted, but got accepted", dropPort)
+	}
+
+	return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterInputDropTCPSrcPort) LocalAction(ip net.IP) error {
+	if err := connectTCP(ip, acceptPort, dropPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection on port %d should not be acceptedi, but got accepted", dropPort)
+	}
+
+	return nil
+}
diff --git a/test/iptables/filter_output.go b/test/iptables/filter_output.go
new file mode 100644
index 000000000..ee2c49f9a
--- /dev/null
+++ b/test/iptables/filter_output.go
@@ -0,0 +1,87 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package iptables
+
+import (
+	"fmt"
+	"net"
+)
+
+func init() {
+	RegisterTestCase(FilterOutputDropTCPDestPort{})
+	RegisterTestCase(FilterOutputDropTCPSrcPort{})
+}
+
+// FilterOutputDropTCPDestPort tests that connections are not accepted on specified source ports.
+type FilterOutputDropTCPDestPort struct{}
+
+// Name implements TestCase.Name.
+func (FilterOutputDropTCPDestPort) Name() string {
+	return "FilterOutputDropTCPDestPort"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterOutputDropTCPDestPort) ContainerAction(ip net.IP) error {
+	if err := filterTable("-A", "OUTPUT", "-p", "tcp", "-m", "tcp", "--dport", fmt.Sprintf("%d", dropPort), "-j", "DROP"); err != nil {
+		return err
+	}
+
+	// Listen for TCP packets on accept port.
+	if err := listenTCP(acceptPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection destined to port %d should not be accepted, but got accepted", dropPort)
+	}
+
+	return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterOutputDropTCPDestPort) LocalAction(ip net.IP) error {
+	if err := connectTCP(ip, acceptPort, dropPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection on port %d should not be accepted, but got accepted", dropPort)
+	}
+
+	return nil
+}
+
+// FilterOutputDropTCPSrcPort tests that connections are not accepted on specified source ports.
+type FilterOutputDropTCPSrcPort struct{}
+
+// Name implements TestCase.Name.
+func (FilterOutputDropTCPSrcPort) Name() string {
+	return "FilterOutputDropTCPSrcPort"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterOutputDropTCPSrcPort) ContainerAction(ip net.IP) error {
+	if err := filterTable("-A", "OUTPUT", "-p", "tcp", "-m", "tcp", "--sport", fmt.Sprintf("%d", dropPort), "-j", "DROP"); err != nil {
+		return err
+	}
+
+	// Listen for TCP packets on drop port.
+	if err := listenTCP(dropPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection on port %d should not be accepted, but got accepted", dropPort)
+	}
+
+	return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterOutputDropTCPSrcPort) LocalAction(ip net.IP) error {
+	if err := connectTCP(ip, dropPort, acceptPort, sendloopDuration); err == nil {
+		return fmt.Errorf("connection destined to port %d should not be accepted, but got accepted", dropPort)
+	}
+
+	return nil
+}
diff --git a/test/iptables/iptables_test.go b/test/iptables/iptables_test.go
index bfbf1bb87..d268ea9b4 100644
--- a/test/iptables/iptables_test.go
+++ b/test/iptables/iptables_test.go
@@ -28,7 +28,7 @@ import (
 	"gvisor.dev/gvisor/runsc/testutil"
 )
 
-const timeout time.Duration = 10 * time.Second
+const timeout = 18 * time.Second
 
 var image = flag.String("image", "bazel/test/iptables/runner:runner", "image to run tests in")
 
@@ -177,3 +177,39 @@ func TestFilterInputDropDifferentUDPPort(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func TestNATRedirectUDPPort(t *testing.T) {
+	if err := singleTest(NATRedirectUDPPort{}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestNATDropUDP(t *testing.T) {
+	if err := singleTest(NATDropUDP{}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestFilterInputDropTCPDestPort(t *testing.T) {
+	if err := singleTest(FilterInputDropTCPDestPort{}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestFilterInputDropTCPSrcPort(t *testing.T) {
+	if err := singleTest(FilterInputDropTCPSrcPort{}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestFilterOutputDropTCPDestPort(t *testing.T) {
+	if err := singleTest(FilterOutputDropTCPDestPort{}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestFilterOutputDropTCPSrcPort(t *testing.T) {
+	if err := singleTest(FilterOutputDropTCPSrcPort{}); err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/test/iptables/iptables_util.go b/test/iptables/iptables_util.go
index 3a4d11f1a..1c4f4f665 100644
--- a/test/iptables/iptables_util.go
+++ b/test/iptables/iptables_util.go
@@ -80,3 +80,56 @@ func sendUDPLoop(ip net.IP, port int, duration time.Duration) error {
 
 	return nil
 }
+
+// listenTCP listens for connections on a TCP port.
+func listenTCP(port int, timeout time.Duration) error {
+	localAddr := net.TCPAddr{
+		Port: port,
+	}
+
+	// Starts listening on port.
+	lConn, err := net.ListenTCP("tcp4", &localAddr)
+	if err != nil {
+		return err
+	}
+	defer lConn.Close()
+
+	// Accept connections on port.
+	lConn.SetDeadline(time.Now().Add(timeout))
+	conn, err := lConn.AcceptTCP()
+	if err != nil {
+		return err
+	}
+	conn.Close()
+	return nil
+}
+
+// connectTCP connects the TCP server over specified local port, server IP and remote/server port.
+func connectTCP(ip net.IP, remotePort, localPort int, duration time.Duration) error {
+	remote := net.TCPAddr{
+		IP:   ip,
+		Port: remotePort,
+	}
+
+	local := net.TCPAddr{
+		Port: localPort,
+	}
+
+	// Container may not be up. Retry DialTCP over a duration.
+	to := time.After(duration)
+	for {
+		conn, err := net.DialTCP("tcp4", &local, &remote)
+		if err == nil {
+			conn.Close()
+			return nil
+		}
+		select {
+		// Timed out waiting for connection to be accepted.
+		case <-to:
+			return err
+		default:
+			time.Sleep(200 * time.Millisecond)
+		}
+	}
+	return fmt.Errorf("Failed to establish connection on port %d", localPort)
+}
diff --git a/test/iptables/nat.go b/test/iptables/nat.go
new file mode 100644
index 000000000..b5c6f927e
--- /dev/null
+++ b/test/iptables/nat.go
@@ -0,0 +1,80 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package iptables
+
+import (
+	"fmt"
+	"net"
+)
+
+const (
+	redirectPort = 42
+)
+
+func init() {
+	RegisterTestCase(NATRedirectUDPPort{})
+	RegisterTestCase(NATDropUDP{})
+}
+
+// NATRedirectUDPPort tests that packets are redirected to different port.
+type NATRedirectUDPPort struct{}
+
+// Name implements TestCase.Name.
+func (NATRedirectUDPPort) Name() string {
+	return "NATRedirectUDPPort"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATRedirectUDPPort) ContainerAction(ip net.IP) error {
+	if err := filterTable("-t", "nat", "-A", "PREROUTING", "-p", "udp", "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", redirectPort)); err != nil {
+		return err
+	}
+
+	if err := listenUDP(redirectPort, sendloopDuration); err != nil {
+		return fmt.Errorf("packets on port %d should be allowed, but encountered an error: %v", redirectPort, err)
+	}
+	return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATRedirectUDPPort) LocalAction(ip net.IP) error {
+	return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}
+
+// NATDropUDP tests that packets are not received in ports other than redirect port.
+type NATDropUDP struct{}
+
+// Name implements TestCase.Name.
+func (NATDropUDP) Name() string {
+	return "NATDropUDP"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATDropUDP) ContainerAction(ip net.IP) error {
+	if err := filterTable("-t", "nat", "-A", "PREROUTING", "-p", "udp", "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", redirectPort)); err != nil {
+		return err
+	}
+
+	if err := listenUDP(acceptPort, sendloopDuration); err == nil {
+		return fmt.Errorf("packets on port %d should have been redirected to port %d", acceptPort, redirectPort)
+	}
+
+	return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATDropUDP) LocalAction(ip net.IP) error {
+	return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}