fix rootless port forwarding with network dis-/connect

The rootlessport forwarder requires a child IP to be set. This must be a
valid ip in the container network namespace. The problem is that after a
network disconnect and connect the eth0 ip changed. Therefore the
packages are dropped since the source ip does no longer exists in the
netns.
One solution is to set the child IP to 127.0.0.1, however this is a
security problem. [1]

To fix this we have to recreate the ports after network connect and
disconnect. To make this work the rootlessport process exposes a socket
where podman network connect/disconnect connect to and send to new child
IP to rootlessport. The rootlessport process will remove all ports and
recreate them with the new correct child IP.

Also bump rootlesskit to v0.14.3 to fix a race with RemovePort().

Fixes #10052

[1] https://nvd.nist.gov/vuln/detail/CVE-2021-20199

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

4 files changed, 16 insertions, 6 deletions

diff --git a/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/parent.go b/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/parent.go
index 2895a8f07..abd2c5e2c 100644
--- a/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/parent.go
+++ b/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/parent.go
@@ -12,6 +12,7 @@ import (
 	"strings"
 	"sync"
 	"syscall"
+	"time"
 
 	"github.com/pkg/errors"
 
@@ -140,8 +141,13 @@ func (d *driver) AddPort(ctx context.Context, spec port.Spec) (*port.Status, err
 	}
 	routineStopCh := make(chan struct{})
 	routineStop := func() error {
-		close(routineStopCh)
-		return nil // FIXME
+		routineStopCh <- struct{}{}
+		select {
+		case <-routineStopCh:
+		case <-time.After(5 * time.Second):
+			return errors.New("stop timeout after 5 seconds")
+		}
+		return nil
 	}
 	switch spec.Proto {
 	case "tcp", "tcp4", "tcp6":
diff --git a/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/tcp/tcp.go b/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/tcp/tcp.go
index 7a7a167f1..dcc1068f0 100644
--- a/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/tcp/tcp.go
+++ b/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/tcp/tcp.go
@@ -12,7 +12,7 @@ import (
 	"github.com/rootless-containers/rootlesskit/pkg/port/builtin/msg"
 )
 
-func Run(socketPath string, spec port.Spec, stopCh <-chan struct{}, logWriter io.Writer) error {
+func Run(socketPath string, spec port.Spec, stopCh chan struct{}, logWriter io.Writer) error {
 	ln, err := net.Listen(spec.Proto, net.JoinHostPort(spec.ParentIP, strconv.Itoa(spec.ParentPort)))
 	if err != nil {
 		fmt.Fprintf(logWriter, "listen: %v\n", err)
@@ -31,7 +31,10 @@ func Run(socketPath string, spec port.Spec, stopCh <-chan struct{}, logWriter io
 		}
 	}()
 	go func() {
-		defer ln.Close()
+		defer func() {
+			ln.Close()
+			close(stopCh)
+		}()
 		for {
 			select {
 			case c, ok := <-newConns:
diff --git a/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/udp/udp.go b/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/udp/udp.go
index 0080dd22c..f20721bcc 100644
--- a/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/udp/udp.go
+++ b/vendor/github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/udp/udp.go
@@ -13,7 +13,7 @@ import (
 	"github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/udp/udpproxy"
 )
 
-func Run(socketPath string, spec port.Spec, stopCh <-chan struct{}, logWriter io.Writer) error {
+func Run(socketPath string, spec port.Spec, stopCh chan struct{}, logWriter io.Writer) error {
 	addr, err := net.ResolveUDPAddr(spec.Proto, net.JoinHostPort(spec.ParentIP, strconv.Itoa(spec.ParentPort)))
 	if err != nil {
 		return err
@@ -51,6 +51,7 @@ func Run(socketPath string, spec port.Spec, stopCh <-chan struct{}, logWriter io
 			case <-stopCh:
 				// udpp.Close closes ln as well
 				udpp.Close()
+				close(stopCh)
 				return
 			}
 		}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index c89582328..ee4f9f25e 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -558,7 +558,7 @@ github.com/prometheus/procfs/internal/fs
 github.com/prometheus/procfs/internal/util
 # github.com/rivo/uniseg v0.2.0
 github.com/rivo/uniseg
-# github.com/rootless-containers/rootlesskit v0.14.2
+# github.com/rootless-containers/rootlesskit v0.14.3
 github.com/rootless-containers/rootlesskit/pkg/api
 github.com/rootless-containers/rootlesskit/pkg/msgutil
 github.com/rootless-containers/rootlesskit/pkg/port