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enhance: enable iptables modify nat output chain to redirect outbound traffic by init container #36

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Apr 19, 2024
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enhance: enable iptables modify nat output chain to redirect outbound traffic by init container #36

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84 changes: 42 additions & 42 deletions artifacts/scripts/proxy-init.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -14,27 +14,27 @@ if [ ! -f "${SA_DIR}/token" ]; then
fi

# Remove the old chains, to generate new configs.
iptables -t nat -D PREROUTING -p tcp -j ctrlmesh_PROXY_INBOUND 2>/dev/null
iptables -t mangle -D PREROUTING -p tcp -j ctrlmesh_PROXY_INBOUND 2>/dev/null
iptables -t nat -D OUTPUT -p tcp -j ctrlmesh_PROXY_OUTPUT 2>/dev/null
iptables -t nat -D PREROUTING -p tcp -j CTRLMESH_INBOUND 2>/dev/null
iptables -t mangle -D PREROUTING -p tcp -j CTRLMESH_INBOUND 2>/dev/null
iptables -t nat -D OUTPUT -p tcp -j CTRLMESH_OUTPUT 2>/dev/null

# Flush and delete the ctrlmesh chains.
iptables -t nat -F ctrlmesh_PROXY_OUTPUT 2>/dev/null
iptables -t nat -X ctrlmesh_PROXY_OUTPUT 2>/dev/null
iptables -t nat -F ctrlmesh_PROXY_INBOUND 2>/dev/null
iptables -t nat -X ctrlmesh_PROXY_INBOUND 2>/dev/null
iptables -t mangle -F ctrlmesh_PROXY_INBOUND 2>/dev/null
iptables -t mangle -X ctrlmesh_PROXY_INBOUND 2>/dev/null
iptables -t mangle -F ctrlmesh_PROXY_DIVERT 2>/dev/null
iptables -t mangle -X ctrlmesh_PROXY_DIVERT 2>/dev/null
iptables -t mangle -F ctrlmesh_PROXY_TPROXY 2>/dev/null
iptables -t mangle -X ctrlmesh_PROXY_TPROXY 2>/dev/null
iptables -t nat -F CTRLMESH_OUTPUT 2>/dev/null
iptables -t nat -X CTRLMESH_OUTPUT 2>/dev/null
iptables -t nat -F CTRLMESH_INBOUND 2>/dev/null
iptables -t nat -X CTRLMESH_INBOUND 2>/dev/null
iptables -t mangle -F CTRLMESH_INBOUND 2>/dev/null
iptables -t mangle -X CTRLMESH_INBOUND 2>/dev/null
iptables -t mangle -F CTRLMESH_DIVERT 2>/dev/null
iptables -t mangle -X CTRLMESH_DIVERT 2>/dev/null
iptables -t mangle -F CTRLMESH_TPROXY 2>/dev/null
iptables -t mangle -X CTRLMESH_TPROXY 2>/dev/null

# Must be last, the others refer to it
iptables -t nat -F ctrlmesh_PROXY_REDIRECT 2>/dev/null
iptables -t nat -X ctrlmesh_PROXY_REDIRECT 2>/dev/null
iptables -t nat -F ctrlmesh_PROXY_IN_REDIRECT 2>/dev/null
iptables -t nat -X ctrlmesh_PROXY_IN_REDIRECT 2>/dev/null
iptables -t nat -F CTRLMESH_REDIRECT 2>/dev/null
iptables -t nat -X CTRLMESH_REDIRECT 2>/dev/null
iptables -t nat -F CTRLMESH_IN_REDIRECT 2>/dev/null
iptables -t nat -X CTRLMESH_IN_REDIRECT 2>/dev/null

if [ "${1:-}" = "clean" ]; then
echo "Only cleaning, no new rules added"
Expand Down Expand Up @@ -70,13 +70,13 @@ set -o pipefail
set -x # echo on

# Create a new chain for redirecting outbound traffic to the apiserver port.
# In both chains, '-j RETURN' bypasses Proxy and '-j ctrlmesh_PROXY_REDIRECT' redirects to Proxy.
iptables -t nat -N ctrlmesh_PROXY_REDIRECT
iptables -t nat -A ctrlmesh_PROXY_REDIRECT -p tcp -j REDIRECT --to-port "${PROXY_APISERVER_PORT}"
# In both chains, '-j RETURN' bypasses Proxy and '-j CTRLMESH_REDIRECT' redirects to Proxy.
iptables -t nat -N CTRLMESH_REDIRECT
iptables -t nat -A CTRLMESH_REDIRECT -p tcp -j REDIRECT --to-port "${PROXY_APISERVER_PORT}"

# Use this chain also for redirecting inbound traffic to the webhook port when not using TPROXY.
iptables -t nat -N ctrlmesh_PROXY_IN_REDIRECT
iptables -t nat -A ctrlmesh_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port "${PROXY_WEBHOOK_PORT}"
iptables -t nat -N CTRLMESH_IN_REDIRECT
iptables -t nat -A CTRLMESH_IN_REDIRECT -p tcp -j REDIRECT --to-port "${PROXY_WEBHOOK_PORT}"

# Handling of inbound ports. Traffic will be redirected to Proxy, which will process and forward
# to the local webhook. If not set, no inbound port will be intercepted by the iptables.
Expand All @@ -85,56 +85,56 @@ if [ -n "${INBOUND_WEBHOOK_PORT}" ]; then
# When using TPROXY, create a new chain for routing all inbound traffic to
# Proxy. Any packet entering this chain gets marked with the ${INBOUND_TPROXY_MARK} mark,
# so that they get routed to the loopback interface in order to get redirected to Proxy.
# In the ctrlmesh_PROXY_INBOUND chain, '-j ctrlmesh_PROXY_DIVERT' reroutes to the loopback
# In the CTRLMESH_INBOUND chain, '-j CTRLMESH_DIVERT' reroutes to the loopback
# interface.
# Mark all inbound packets.
iptables -t mangle -N ctrlmesh_PROXY_DIVERT
iptables -t mangle -A ctrlmesh_PROXY_DIVERT -j MARK --set-mark "${INBOUND_TPROXY_MARK}"
iptables -t mangle -A ctrlmesh_PROXY_DIVERT -j ACCEPT
iptables -t mangle -N CTRLMESH_DIVERT
iptables -t mangle -A CTRLMESH_DIVERT -j MARK --set-mark "${INBOUND_TPROXY_MARK}"
iptables -t mangle -A CTRLMESH_DIVERT -j ACCEPT

# Route all packets marked in chain ctrlmesh_PROXY_DIVERT using routing table ${INBOUND_TPROXY_ROUTE_TABLE}.
# Route all packets marked in chain CTRLMESH_DIVERT using routing table ${INBOUND_TPROXY_ROUTE_TABLE}.
ip -f inet rule add fwmark "${INBOUND_TPROXY_MARK}" lookup "${INBOUND_TPROXY_ROUTE_TABLE}"
# In routing table ${INBOUND_TPROXY_ROUTE_TABLE}, create a single default rule to route all traffic to
# the loopback interface.
ip -f inet route add local default dev lo table "${INBOUND_TPROXY_ROUTE_TABLE}" || ip route show table all

# Create a new chain for redirecting inbound traffic to the common Envoy
# port.
# In the ctrlmesh_PROXY_INBOUND chain, '-j RETURN' bypasses Envoy and
# '-j ctrlmesh_PROXY_TPROXY' redirects to Envoy.
iptables -t mangle -N ctrlmesh_PROXY_TPROXY
iptables -t mangle -A ctrlmesh_PROXY_TPROXY ! -d 127.0.0.1/32 -p tcp -j TPROXY --tproxy-mark "${INBOUND_TPROXY_MARK}"/0xffffffff --on-port "${PROXY_PORT}"
# In the CTRLMESH_INBOUND chain, '-j RETURN' bypasses Envoy and
# '-j CTRLMESH_TPROXY' redirects to Envoy.
iptables -t mangle -N CTRLMESH_TPROXY
iptables -t mangle -A CTRLMESH_TPROXY ! -d 127.0.0.1/32 -p tcp -j TPROXY --tproxy-mark "${INBOUND_TPROXY_MARK}"/0xffffffff --on-port "${PROXY_PORT}"

table=mangle
else
table=nat
fi
iptables -t "${table}" -N ctrlmesh_PROXY_INBOUND
iptables -t "${table}" -A PREROUTING -p tcp -j ctrlmesh_PROXY_INBOUND
iptables -t "${table}" -N CTRLMESH_INBOUND
iptables -t "${table}" -A PREROUTING -p tcp -j CTRLMESH_INBOUND

if [ "${INBOUND_INTERCEPTION_MODE}" = "TPROXY" ]; then
iptables -t mangle -A ctrlmesh_PROXY_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -m socket -j ctrlmesh_PROXY_DIVERT || echo "No socket match support"
iptables -t mangle -A ctrlmesh_PROXY_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -m socket -j ctrlmesh_PROXY_DIVERT || echo "No socket match support"
iptables -t mangle -A ctrlmesh_PROXY_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -j ctrlmesh_PROXY_TPROXY
iptables -t mangle -A CTRLMESH_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -m socket -j CTRLMESH_DIVERT || echo "No socket match support"
iptables -t mangle -A CTRLMESH_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -m socket -j CTRLMESH_DIVERT || echo "No socket match support"
iptables -t mangle -A CTRLMESH_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -j CTRLMESH_TPROXY
else
iptables -t nat -A ctrlmesh_PROXY_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -j ctrlmesh_PROXY_IN_REDIRECT
iptables -t nat -A CTRLMESH_INBOUND -p tcp --dport "${INBOUND_WEBHOOK_PORT}" -j CTRLMESH_IN_REDIRECT
fi
fi

# Create a new chain for selectively redirecting outbound packets to Proxy.
iptables -t nat -N ctrlmesh_PROXY_OUTPUT
iptables -t nat -N CTRLMESH_OUTPUT

# Jump to the ctrlmesh_PROXY_OUTPUT chain from OUTPUT chain for all tcp traffic.
iptables -t nat -A OUTPUT -p tcp -j ctrlmesh_PROXY_OUTPUT
# Jump to the CTRLMESH_OUTPUT chain from OUTPUT chain for all tcp traffic.
iptables -t nat -A OUTPUT -p tcp -j CTRLMESH_OUTPUT

for uid in ${PROXY_UID}; do
# Avoid infinite loops. Don't redirect Proxy traffic directly back to
# Proxy for non-loopback traffic.
iptables -t nat -A ctrlmesh_PROXY_OUTPUT -m owner --uid-owner "${uid}" -j RETURN
iptables -t nat -A CTRLMESH_OUTPUT -m owner --uid-owner "${uid}" -j RETURN
done

# Redirect all apiserver outbound traffic to Proxy.
iptables -t nat -A ctrlmesh_PROXY_OUTPUT -d "${KUBERNETES_SERVICE_HOST}" -j ctrlmesh_PROXY_REDIRECT
iptables -t nat -A CTRLMESH_OUTPUT -d "${KUBERNETES_SERVICE_HOST}" -j CTRLMESH_REDIRECT

# Generate certs
mount -o remount,rw "${SA_DIR}"
Expand Down
12 changes: 7 additions & 5 deletions pkg/apis/ctrlmesh/types.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,11 +31,13 @@ const (

// Labels
const (
CtrlmeshControlPrefix = "ctrlmesh.kusionstack.io/"
CtrlmeshIgnoreWebhookLabel = "ctrlmesh.kusionstack.io/ignore-webhook"
CtrlmeshIgnoreValidateLabel = "ctrlmesh.kusionstack.io/ignore-validate"
CtrlmeshDefaultReplicasLabel = "ctrlmesh.kusionstack.io/default-replicas"
CtrlmeshEnableProxyLabel = "ctrlmesh.kusionstack.io/enable-proxy"
CtrlmeshControlPrefix = "ctrlmesh.kusionstack.io/"
CtrlmeshIgnoreWebhookLabel = "ctrlmesh.kusionstack.io/ignore-webhook"
CtrlmeshIgnoreValidateLabel = "ctrlmesh.kusionstack.io/ignore-validate"
CtrlmeshDefaultReplicasLabel = "ctrlmesh.kusionstack.io/default-replicas"
CtrlmeshEnableProxyLabel = "ctrlmesh.kusionstack.io/enable-proxy"
CtrlmeshEnableIptableMode = "ctrlmesh.kusionstack.io/enable-iptables"

CtrlmeshAutoShardingRootLabel = "ctrlmesh.kusionstack.io/auto-sharding-root"
CtrlmeshInRollingLabel = "ctrlmesh.kusionstack.io/rolling"
CtrlmeshDisableFakeKubeconfigArgLabel = "ctrlmesh.kusionstack.io/disable-fake-kubeconfig-arg"
Expand Down
53 changes: 51 additions & 2 deletions pkg/cmd/proxy/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,6 @@ import (

"github.com/KusionStack/controller-mesh/pkg/apis/ctrlmesh/constants"
"github.com/KusionStack/controller-mesh/pkg/client"

proxyapiserver "github.com/KusionStack/controller-mesh/pkg/proxy/apiserver"
proxycache "github.com/KusionStack/controller-mesh/pkg/proxy/cache"
"github.com/KusionStack/controller-mesh/pkg/proxy/circuitbreaker"
Expand All @@ -56,6 +55,8 @@ var (
webhookCertDir = flag.String(constants.ProxyWebhookCertDirFlag, "", "The directory where the webhook certs generated or mounted.")

proxyIptablePort = flag.Int(constants.ProxyIptablesFlag, constants.ProxyIptablesPort, "port that http-tproxy listens on")

enableIpTable = os.Getenv(constants.EnvIPTable) == "true"
)

func main() {
Expand All @@ -66,7 +67,17 @@ func main() {
klog.Fatalf("Environment %s=%s %s=%s not exist.",
constants.EnvPodNamespace, os.Getenv(constants.EnvPodNamespace), constants.EnvPodName, os.Getenv(constants.EnvPodName))
}
cfg := ctrl.GetConfigOrDie()
var cfg *rest.Config

if enableIpTable {
var err error
cfg, err = getRestConfig()
if err != nil {
klog.Fatalf("Failed to get rest config: %v", err)
}
} else {
cfg = ctrl.GetConfigOrDie()
}
cfg.UserAgent = "ctrlmesh"
if err := client.NewRegistry(cfg); err != nil {
klog.Fatalf("Failed to new client registry: %v", err)
Expand Down Expand Up @@ -165,3 +176,41 @@ func serveHTTP(ctx context.Context, readyHandler *healthz.Handler) {
klog.Fatalf("Serve HTTP shutting down on :%d: %v", *metricsHealthPort, err)
}
}

func getRestConfig() (*rest.Config, error) {
const (
tokenFile = "/var/run/secrets/kubernetes.io/serviceaccount/token"
//rootCAFile = "/var/run/secrets/kubernetes.io/serviceaccount/..data/ca.crt"
)
host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
if len(host) == 0 || len(port) == 0 {
return nil, rest.ErrNotInCluster
}

token, err := os.ReadFile(tokenFile)
if err != nil {
return nil, err
}

tlsClientConfig := rest.TLSClientConfig{Insecure: true}

//if _, err := certutil.NewPool(rootCAFile); err != nil {
// klog.Errorf("Expected to load root CA config from %s, but got err: %v", rootCAFile, err)
//} else {
// tlsClientConfig.CAFile = rootCAFile
//}

cfg := &rest.Config{
// TODO: switch to using cluster DNS.
Host: "https://" + net.JoinHostPort(host, port),
TLSClientConfig: tlsClientConfig,
BearerToken: string(token),
BearerTokenFile: tokenFile,

Burst: 3000,
QPS: 2000.0,
}
klog.V(3).Infof("Starting with rest config: %v", utils.DumpJSON(cfg))

return cfg, nil
}
20 changes: 9 additions & 11 deletions pkg/webhook/pod/injector.go
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,7 @@ func (h *MutatingHandler) injectByShardingConfig(ctx context.Context, pod *v1.Po
if *proxyImage == "" {
return fmt.Errorf("the images for ControllerMesh init or proxy container have not set in args")
}

enableIpTable := pod.Labels[ctrlmesh.CtrlmeshEnableIptableMode] == "true"
imagePullPolicy := v1.PullAlways
if *proxyImagePullPolicy == string(v1.PullIfNotPresent) {
imagePullPolicy = v1.PullIfNotPresent
Expand Down Expand Up @@ -177,6 +177,13 @@ func (h *MutatingHandler) injectByShardingConfig(ctx context.Context, pod *v1.Po
},
}

if enableIpTable {
proxyContainer.Env = append(proxyContainer.Env, v1.EnvVar{
Name: constants.EnvIPTable,
Value: "true",
})
}

if val, ok := pod.Annotations[ctrlmesh.CtrlmeshProxyContainerResourceAnno]; ok {
req := &v1.ResourceRequirements{}
if err := json.Unmarshal([]byte(val), req); err != nil {
Expand Down Expand Up @@ -213,15 +220,6 @@ func (h *MutatingHandler) injectByShardingConfig(ctx context.Context, pod *v1.Po
proxyContainer.Env = append(proxyContainer.Env, apiserverHostPortEnvs...)
}

ipTableEnvs := getEnv(pod, constants.EnvIPTable)
enableIpTable := false
if len(ipTableEnvs) > 0 {
initContainer.Env = append(initContainer.Env, ipTableEnvs...)
//proxyContainer.Env = append(proxyContainer.Env, ipTableEnvs...)
if ipTableEnvs[0].Value == "true" {
enableIpTable = true
}
}
if !enableIpTable {
if err := h.applyFakeConfigMap(pod); err != nil {
return err
Expand Down Expand Up @@ -271,7 +269,7 @@ func (h *MutatingHandler) injectByShardingConfig(ctx context.Context, pod *v1.Po
proxyContainer.VolumeMounts = append(proxyContainer.VolumeMounts, certVolumeMounts[0])
}
}
if *initImage != "" {
if enableIpTable && *initImage != "" {
pod.Spec.InitContainers = append([]v1.Container{*initContainer}, pod.Spec.InitContainers...)
}
if pod.Labels == nil {
Expand Down
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