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-rw-r--r--test/iptables/filter_input.go65
-rw-r--r--test/iptables/filter_output.go56
-rw-r--r--test/iptables/iptables_test.go66
-rw-r--r--test/iptables/iptables_util.go25
-rw-r--r--test/iptables/nat.go201
5 files changed, 411 insertions, 2 deletions
diff --git a/test/iptables/filter_input.go b/test/iptables/filter_input.go
index b2fb6401a..0d3350d8a 100644
--- a/test/iptables/filter_input.go
+++ b/test/iptables/filter_input.go
@@ -47,6 +47,8 @@ func init() {
RegisterTestCase(FilterInputJumpReturnDrop{})
RegisterTestCase(FilterInputJumpBuiltin{})
RegisterTestCase(FilterInputJumpTwice{})
+ RegisterTestCase(FilterInputDestination{})
+ RegisterTestCase(FilterInputInvertDestination{})
}
// FilterInputDropUDP tests that we can drop UDP traffic.
@@ -595,3 +597,66 @@ func (FilterInputJumpTwice) ContainerAction(ip net.IP) error {
func (FilterInputJumpTwice) LocalAction(ip net.IP) error {
return sendUDPLoop(ip, acceptPort, sendloopDuration)
}
+
+// FilterInputDestination verifies that we can filter packets via `-d
+// <ipaddr>`.
+type FilterInputDestination struct{}
+
+// Name implements TestCase.Name.
+func (FilterInputDestination) Name() string {
+ return "FilterInputDestination"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterInputDestination) ContainerAction(ip net.IP) error {
+ addrs, err := localAddrs()
+ if err != nil {
+ return err
+ }
+
+ // Make INPUT's default action DROP, then ACCEPT all packets bound for
+ // this machine.
+ rules := [][]string{{"-P", "INPUT", "DROP"}}
+ for _, addr := range addrs {
+ rules = append(rules, []string{"-A", "INPUT", "-d", addr, "-j", "ACCEPT"})
+ }
+ if err := filterTableRules(rules); err != nil {
+ return err
+ }
+
+ return listenUDP(acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterInputDestination) LocalAction(ip net.IP) error {
+ return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}
+
+// FilterInputDestination verifies that we can filter packets via `! -d
+// <ipaddr>`.
+type FilterInputInvertDestination struct{}
+
+// Name implements TestCase.Name.
+func (FilterInputInvertDestination) Name() string {
+ return "FilterInputInvertDestination"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterInputInvertDestination) ContainerAction(ip net.IP) error {
+ // Make INPUT's default action DROP, then ACCEPT all packets not bound
+ // for 127.0.0.1.
+ rules := [][]string{
+ {"-P", "INPUT", "DROP"},
+ {"-A", "INPUT", "!", "-d", localIP, "-j", "ACCEPT"},
+ }
+ if err := filterTableRules(rules); err != nil {
+ return err
+ }
+
+ return listenUDP(acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterInputInvertDestination) LocalAction(ip net.IP) error {
+ return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}
diff --git a/test/iptables/filter_output.go b/test/iptables/filter_output.go
index ee2c49f9a..39e648e32 100644
--- a/test/iptables/filter_output.go
+++ b/test/iptables/filter_output.go
@@ -22,6 +22,8 @@ import (
func init() {
RegisterTestCase(FilterOutputDropTCPDestPort{})
RegisterTestCase(FilterOutputDropTCPSrcPort{})
+ RegisterTestCase(FilterOutputDestination{})
+ RegisterTestCase(FilterOutputInvertDestination{})
}
// FilterOutputDropTCPDestPort tests that connections are not accepted on specified source ports.
@@ -85,3 +87,57 @@ func (FilterOutputDropTCPSrcPort) LocalAction(ip net.IP) error {
return nil
}
+
+// FilterOutputDestination tests that we can selectively allow packets to
+// certain destinations.
+type FilterOutputDestination struct{}
+
+// Name implements TestCase.Name.
+func (FilterOutputDestination) Name() string {
+ return "FilterOutputDestination"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterOutputDestination) ContainerAction(ip net.IP) error {
+ rules := [][]string{
+ {"-A", "OUTPUT", "-d", ip.String(), "-j", "ACCEPT"},
+ {"-P", "OUTPUT", "DROP"},
+ }
+ if err := filterTableRules(rules); err != nil {
+ return err
+ }
+
+ return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterOutputDestination) LocalAction(ip net.IP) error {
+ return listenUDP(acceptPort, sendloopDuration)
+}
+
+// FilterOutputInvertDestination tests that we can selectively allow packets
+// not headed for a particular destination.
+type FilterOutputInvertDestination struct{}
+
+// Name implements TestCase.Name.
+func (FilterOutputInvertDestination) Name() string {
+ return "FilterOutputInvertDestination"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterOutputInvertDestination) ContainerAction(ip net.IP) error {
+ rules := [][]string{
+ {"-A", "OUTPUT", "!", "-d", localIP, "-j", "ACCEPT"},
+ {"-P", "OUTPUT", "DROP"},
+ }
+ if err := filterTableRules(rules); err != nil {
+ return err
+ }
+
+ return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterOutputInvertDestination) LocalAction(ip net.IP) error {
+ return listenUDP(acceptPort, sendloopDuration)
+}
diff --git a/test/iptables/iptables_test.go b/test/iptables/iptables_test.go
index 0621861eb..5eabd2461 100644
--- a/test/iptables/iptables_test.go
+++ b/test/iptables/iptables_test.go
@@ -285,3 +285,69 @@ func TestJumpTwice(t *testing.T) {
t.Fatal(err)
}
}
+
+func TestInputDestination(t *testing.T) {
+ if err := singleTest(FilterInputDestination{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestInputInvertDestination(t *testing.T) {
+ if err := singleTest(FilterInputInvertDestination{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestOutputDestination(t *testing.T) {
+ if err := singleTest(FilterOutputDestination{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestOutputInvertDestination(t *testing.T) {
+ if err := singleTest(FilterOutputInvertDestination{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestNATOutRedirectIP(t *testing.T) {
+ if err := singleTest(NATOutRedirectIP{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestNATOutDontRedirectIP(t *testing.T) {
+ if err := singleTest(NATOutDontRedirectIP{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestNATOutRedirectInvert(t *testing.T) {
+ if err := singleTest(NATOutRedirectInvert{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestNATPreRedirectIP(t *testing.T) {
+ if err := singleTest(NATPreRedirectIP{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestNATPreDontRedirectIP(t *testing.T) {
+ if err := singleTest(NATPreDontRedirectIP{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestNATPreRedirectInvert(t *testing.T) {
+ if err := singleTest(NATPreRedirectInvert{}); err != nil {
+ t.Fatal(err)
+ }
+}
+
+func TestNATRedirectRequiresProtocol(t *testing.T) {
+ if err := singleTest(NATRedirectRequiresProtocol{}); err != nil {
+ t.Fatal(err)
+ }
+}
diff --git a/test/iptables/iptables_util.go b/test/iptables/iptables_util.go
index 32cf5a417..178a662e1 100644
--- a/test/iptables/iptables_util.go
+++ b/test/iptables/iptables_util.go
@@ -24,6 +24,7 @@ import (
)
const iptablesBinary = "iptables"
+const localIP = "127.0.0.1"
// filterTable calls `iptables -t filter` with the given args.
func filterTable(args ...string) error {
@@ -46,8 +47,17 @@ func tableCmd(table string, args []string) error {
// filterTableRules is like filterTable, but runs multiple iptables commands.
func filterTableRules(argsList [][]string) error {
+ return tableRules("filter", argsList)
+}
+
+// natTableRules is like natTable, but runs multiple iptables commands.
+func natTableRules(argsList [][]string) error {
+ return tableRules("nat", argsList)
+}
+
+func tableRules(table string, argsList [][]string) error {
for _, args := range argsList {
- if err := filterTable(args...); err != nil {
+ if err := tableCmd(table, args); err != nil {
return err
}
}
@@ -149,3 +159,16 @@ func connectTCP(ip net.IP, remotePort, localPort int, timeout time.Duration) err
return nil
}
+
+// localAddrs returns a list of local network interface addresses.
+func localAddrs() ([]string, error) {
+ addrs, err := net.InterfaceAddrs()
+ if err != nil {
+ return nil, err
+ }
+ addrStrs := make([]string, 0, len(addrs))
+ for _, addr := range addrs {
+ addrStrs = append(addrStrs, addr.String())
+ }
+ return addrStrs, nil
+}
diff --git a/test/iptables/nat.go b/test/iptables/nat.go
index a01117ec8..020c862ad 100644
--- a/test/iptables/nat.go
+++ b/test/iptables/nat.go
@@ -15,8 +15,10 @@
package iptables
import (
+ "errors"
"fmt"
"net"
+ "time"
)
const (
@@ -26,6 +28,13 @@ const (
func init() {
RegisterTestCase(NATRedirectUDPPort{})
RegisterTestCase(NATDropUDP{})
+ RegisterTestCase(NATPreRedirectIP{})
+ RegisterTestCase(NATPreDontRedirectIP{})
+ RegisterTestCase(NATPreRedirectInvert{})
+ RegisterTestCase(NATOutRedirectIP{})
+ RegisterTestCase(NATOutDontRedirectIP{})
+ RegisterTestCase(NATOutRedirectInvert{})
+ RegisterTestCase(NATRedirectRequiresProtocol{})
}
// NATRedirectUDPPort tests that packets are redirected to different port.
@@ -53,7 +62,8 @@ 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.
+// NATDropUDP tests that packets are not received in ports other than redirect
+// port.
type NATDropUDP struct{}
// Name implements TestCase.Name.
@@ -78,3 +88,192 @@ func (NATDropUDP) ContainerAction(ip net.IP) error {
func (NATDropUDP) LocalAction(ip net.IP) error {
return sendUDPLoop(ip, acceptPort, sendloopDuration)
}
+
+// NATOutRedirectIP uses iptables to select packets based on destination IP and
+// redirects them.
+type NATOutRedirectIP struct{}
+
+// Name implements TestCase.Name.
+func (NATOutRedirectIP) Name() string {
+ return "NATOutRedirectIP"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATOutRedirectIP) ContainerAction(ip net.IP) error {
+ // Redirect OUTPUT packets to a listening localhost port.
+ dest := net.IP([]byte{200, 0, 0, 2})
+ return loopbackTest(dest, "-A", "OUTPUT", "-d", dest.String(), "-p", "udp", "-j", "REDIRECT", "--to-port", fmt.Sprintf("%d", acceptPort))
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATOutRedirectIP) LocalAction(ip net.IP) error {
+ // No-op.
+ return nil
+}
+
+// NATOutDontRedirectIP tests that iptables matching with "-d" does not match
+// packets it shouldn't.
+type NATOutDontRedirectIP struct{}
+
+// Name implements TestCase.Name.
+func (NATOutDontRedirectIP) Name() string {
+ return "NATOutDontRedirectIP"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATOutDontRedirectIP) ContainerAction(ip net.IP) error {
+ if err := natTable("-A", "OUTPUT", "-d", localIP, "-p", "udp", "-j", "REDIRECT", "--to-port", fmt.Sprintf("%d", dropPort)); err != nil {
+ return err
+ }
+ return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATOutDontRedirectIP) LocalAction(ip net.IP) error {
+ return listenUDP(acceptPort, sendloopDuration)
+}
+
+// NATOutRedirectInvert tests that iptables can match with "! -d".
+type NATOutRedirectInvert struct{}
+
+// Name implements TestCase.Name.
+func (NATOutRedirectInvert) Name() string {
+ return "NATOutRedirectInvert"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATOutRedirectInvert) ContainerAction(ip net.IP) error {
+ // Redirect OUTPUT packets to a listening localhost port.
+ dest := []byte{200, 0, 0, 3}
+ destStr := "200.0.0.2"
+ return loopbackTest(dest, "-A", "OUTPUT", "!", "-d", destStr, "-p", "udp", "-j", "REDIRECT", "--to-port", fmt.Sprintf("%d", acceptPort))
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATOutRedirectInvert) LocalAction(ip net.IP) error {
+ // No-op.
+ return nil
+}
+
+// NATPreRedirectIP tests that we can use iptables to select packets based on
+// destination IP and redirect them.
+type NATPreRedirectIP struct{}
+
+// Name implements TestCase.Name.
+func (NATPreRedirectIP) Name() string {
+ return "NATPreRedirectIP"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATPreRedirectIP) ContainerAction(ip net.IP) error {
+ addrs, err := localAddrs()
+ if err != nil {
+ return err
+ }
+
+ var rules [][]string
+ for _, addr := range addrs {
+ rules = append(rules, []string{"-A", "PREROUTING", "-p", "udp", "-d", addr, "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", acceptPort)})
+ }
+ if err := natTableRules(rules); err != nil {
+ return err
+ }
+ return listenUDP(acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATPreRedirectIP) LocalAction(ip net.IP) error {
+ return sendUDPLoop(ip, dropPort, sendloopDuration)
+}
+
+// NATPreDontRedirectIP tests that iptables matching with "-d" does not match
+// packets it shouldn't.
+type NATPreDontRedirectIP struct{}
+
+// Name implements TestCase.Name.
+func (NATPreDontRedirectIP) Name() string {
+ return "NATPreDontRedirectIP"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATPreDontRedirectIP) ContainerAction(ip net.IP) error {
+ if err := natTable("-A", "PREROUTING", "-p", "udp", "-d", localIP, "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", dropPort)); err != nil {
+ return err
+ }
+ return listenUDP(acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATPreDontRedirectIP) LocalAction(ip net.IP) error {
+ return sendUDPLoop(ip, acceptPort, sendloopDuration)
+}
+
+// NATPreRedirectInvert tests that iptables can match with "! -d".
+type NATPreRedirectInvert struct{}
+
+// Name implements TestCase.Name.
+func (NATPreRedirectInvert) Name() string {
+ return "NATPreRedirectInvert"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATPreRedirectInvert) ContainerAction(ip net.IP) error {
+ if err := natTable("-A", "PREROUTING", "-p", "udp", "!", "-d", localIP, "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", acceptPort)); err != nil {
+ return err
+ }
+ return listenUDP(acceptPort, sendloopDuration)
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATPreRedirectInvert) LocalAction(ip net.IP) error {
+ return sendUDPLoop(ip, dropPort, sendloopDuration)
+}
+
+// NATRedirectRequiresProtocol tests that use of the --to-ports flag requires a
+// protocol to be specified with -p.
+type NATRedirectRequiresProtocol struct{}
+
+// Name implements TestCase.Name.
+func (NATRedirectRequiresProtocol) Name() string {
+ return "NATRedirectRequiresProtocol"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (NATRedirectRequiresProtocol) ContainerAction(ip net.IP) error {
+ if err := natTable("-A", "PREROUTING", "-d", localIP, "-j", "REDIRECT", "--to-ports", fmt.Sprintf("%d", acceptPort)); err == nil {
+ return errors.New("expected an error using REDIRECT --to-ports without a protocol")
+ }
+ return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (NATRedirectRequiresProtocol) LocalAction(ip net.IP) error {
+ // No-op.
+ return nil
+}
+
+// loopbackTests runs an iptables rule and ensures that packets sent to
+// dest:dropPort are received by localhost:acceptPort.
+func loopbackTest(dest net.IP, args ...string) error {
+ if err := natTable(args...); err != nil {
+ return err
+ }
+ sendCh := make(chan error)
+ listenCh := make(chan error)
+ go func() {
+ sendCh <- sendUDPLoop(dest, dropPort, sendloopDuration)
+ }()
+ go func() {
+ listenCh <- listenUDP(acceptPort, sendloopDuration)
+ }()
+ select {
+ case err := <-listenCh:
+ if err != nil {
+ return err
+ }
+ case <-time.After(sendloopDuration):
+ return errors.New("timed out")
+ }
+ // sendCh will always take the full sendloop time.
+ return <-sendCh
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 10:18:55 +0000