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feat: implement ingress firewall rules
Fixes siderolabs#4421 See documentation for details on how to use the feature. With `talosctl cluster create`, firewall can be easily test with `--with-firewall=accept|block` (default mode). Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
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191 changes: 191 additions & 0 deletions
191
cmd/talosctl/cmd/mgmt/cluster/internal/firewallpatch/firewallpatch.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
|
||
| // Package firewallpatch provides a set of default config patches to enable firewall. | ||
| package firewallpatch | ||
|
|
||
| import ( | ||
| "net/netip" | ||
|
|
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| "github.com/siderolabs/gen/xslices" | ||
|
|
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| "github.com/siderolabs/talos/pkg/machinery/config/configpatcher" | ||
| "github.com/siderolabs/talos/pkg/machinery/config/container" | ||
| "github.com/siderolabs/talos/pkg/machinery/config/types/network" | ||
| "github.com/siderolabs/talos/pkg/machinery/constants" | ||
| "github.com/siderolabs/talos/pkg/machinery/nethelpers" | ||
| ) | ||
|
|
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| func ingressRuleWithinCluster(cidrs []netip.Prefix, gateways []netip.Addr) []network.IngressRule { | ||
| rules := make([]network.IngressRule, 0, len(cidrs)) | ||
|
|
||
| for i := range cidrs { | ||
| rules = append(rules, | ||
| network.IngressRule{ | ||
| Subnet: cidrs[i], | ||
| Except: netip.PrefixFrom(gateways[i], gateways[i].BitLen()), | ||
| }, | ||
| ) | ||
| } | ||
|
|
||
| return rules | ||
| } | ||
|
|
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| func ingressRuleWideOpen() []network.IngressRule { | ||
| return []network.IngressRule{ | ||
| { | ||
| Subnet: netip.MustParsePrefix("0.0.0.0/0"), | ||
| }, | ||
| { | ||
| Subnet: netip.MustParsePrefix("::/0"), | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func ingressOnly(ips []netip.Addr) []network.IngressRule { | ||
| return xslices.Map(ips, func(ip netip.Addr) network.IngressRule { | ||
| return network.IngressRule{ | ||
| Subnet: netip.PrefixFrom(ip, ip.BitLen()), | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| // ControlPlane generates a default firewall for a controlplane node. | ||
| // | ||
| // Kubelet and Trustd are only available within the cluster. | ||
| // Apid & Kubernetes API is wide open. | ||
| // Etcd is only available within the controlplanes. | ||
| func ControlPlane(defaultAction nethelpers.DefaultAction, cidrs []netip.Prefix, gateways []netip.Addr, controlplanes []netip.Addr) configpatcher.Patch { | ||
| def := network.NewDefaultActionConfigV1Alpha1() | ||
| def.Ingress = defaultAction | ||
|
|
||
| kubeletRule := network.NewRuleConfigV1Alpha1() | ||
| kubeletRule.MetaName = "kubelet-ingress" | ||
| kubeletRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: constants.KubeletPort, | ||
| Hi: constants.KubeletPort, | ||
| }, | ||
| } | ||
| kubeletRule.PortSelector.Protocol = nethelpers.ProtocolTCP | ||
| kubeletRule.Ingress = ingressRuleWithinCluster(cidrs, gateways) | ||
|
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| apidRule := network.NewRuleConfigV1Alpha1() | ||
| apidRule.MetaName = "apid-ingress" | ||
| apidRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: constants.ApidPort, | ||
| Hi: constants.ApidPort, | ||
| }, | ||
| } | ||
| apidRule.PortSelector.Protocol = nethelpers.ProtocolTCP | ||
| apidRule.Ingress = ingressRuleWideOpen() | ||
|
|
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| trustdRule := network.NewRuleConfigV1Alpha1() | ||
| trustdRule.MetaName = "trustd-ingress" | ||
| trustdRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: constants.TrustdPort, | ||
| Hi: constants.TrustdPort, | ||
| }, | ||
| } | ||
| trustdRule.PortSelector.Protocol = nethelpers.ProtocolTCP | ||
| trustdRule.Ingress = ingressRuleWithinCluster(cidrs, gateways) | ||
|
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| kubeAPIRule := network.NewRuleConfigV1Alpha1() | ||
| kubeAPIRule.MetaName = "kubernetes-api-ingress" | ||
| kubeAPIRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: constants.DefaultControlPlanePort, | ||
| Hi: constants.DefaultControlPlanePort, | ||
| }, | ||
| } | ||
| kubeAPIRule.PortSelector.Protocol = nethelpers.ProtocolTCP | ||
| kubeAPIRule.Ingress = ingressRuleWideOpen() | ||
|
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| etcdRule := network.NewRuleConfigV1Alpha1() | ||
| etcdRule.MetaName = "etcd-ingress" | ||
| etcdRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: constants.EtcdClientPort, | ||
| Hi: constants.EtcdPeerPort, | ||
| }, | ||
| } | ||
| etcdRule.PortSelector.Protocol = nethelpers.ProtocolTCP | ||
| etcdRule.Ingress = ingressOnly(controlplanes) | ||
|
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||
| vxlanRule := network.NewRuleConfigV1Alpha1() | ||
| vxlanRule.MetaName = "cni-vxlan" | ||
| vxlanRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: 4789, // Flannel, Calico VXLAN | ||
| Hi: 4789, | ||
| }, | ||
| { | ||
| Lo: 8472, // Cilium VXLAN | ||
| Hi: 8472, | ||
| }, | ||
| } | ||
| vxlanRule.PortSelector.Protocol = nethelpers.ProtocolUDP | ||
| vxlanRule.Ingress = ingressRuleWithinCluster(cidrs, gateways) | ||
|
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||
| provider, err := container.New(def, kubeletRule, apidRule, trustdRule, kubeAPIRule, etcdRule, vxlanRule) | ||
| if err != nil { // should not fail | ||
| panic(err) | ||
| } | ||
|
|
||
| return configpatcher.StrategicMergePatch{Provider: provider} | ||
| } | ||
|
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||
| // Worker generates a default firewall for a worker node. | ||
| // | ||
| // Kubelet & apid are only available within the cluster. | ||
| func Worker(defaultAction nethelpers.DefaultAction, cidrs []netip.Prefix, gateways []netip.Addr) configpatcher.Patch { | ||
| def := network.NewDefaultActionConfigV1Alpha1() | ||
| def.Ingress = defaultAction | ||
|
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| kubeletRule := network.NewRuleConfigV1Alpha1() | ||
| kubeletRule.MetaName = "kubelet-ingress" | ||
| kubeletRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: constants.KubeletPort, | ||
| Hi: constants.KubeletPort, | ||
| }, | ||
| } | ||
| kubeletRule.PortSelector.Protocol = nethelpers.ProtocolTCP | ||
| kubeletRule.Ingress = ingressRuleWithinCluster(cidrs, gateways) | ||
|
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||
| apidRule := network.NewRuleConfigV1Alpha1() | ||
| apidRule.MetaName = "apid-ingress" | ||
| apidRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: constants.ApidPort, | ||
| Hi: constants.ApidPort, | ||
| }, | ||
| } | ||
| apidRule.PortSelector.Protocol = nethelpers.ProtocolTCP | ||
| apidRule.Ingress = ingressRuleWithinCluster(cidrs, gateways) | ||
|
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||
| vxlanRule := network.NewRuleConfigV1Alpha1() | ||
| vxlanRule.MetaName = "cni-vxlan" | ||
| vxlanRule.PortSelector.Ports = []network.PortRange{ | ||
| { | ||
| Lo: 4789, // Flannel, Calico VXLAN | ||
| Hi: 4789, | ||
| }, | ||
| { | ||
| Lo: 8472, // Cilium VXLAN | ||
| Hi: 8472, | ||
| }, | ||
| } | ||
| vxlanRule.PortSelector.Protocol = nethelpers.ProtocolUDP | ||
| vxlanRule.Ingress = ingressRuleWithinCluster(cidrs, gateways) | ||
|
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| provider, err := container.New(def, kubeletRule, apidRule, vxlanRule) | ||
| if err != nil { // should not fail | ||
| panic(err) | ||
| } | ||
|
|
||
| return configpatcher.StrategicMergePatch{Provider: provider} | ||
| } |
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