mirror of https://github.com/kubernetes/kops.git
96 lines
3.1 KiB
Go
96 lines
3.1 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package model
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import (
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"k8s.io/klog/v2"
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"k8s.io/kops/pkg/systemd"
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"k8s.io/kops/upup/pkg/fi"
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"k8s.io/kops/upup/pkg/fi/nodeup/nodetasks"
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)
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// FirewallBuilder configures the firewall (iptables)
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type FirewallBuilder struct {
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*NodeupModelContext
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}
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var _ fi.NodeupModelBuilder = &FirewallBuilder{}
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// Build is responsible for generating any node firewall rules
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func (b *FirewallBuilder) Build(c *fi.NodeupModelBuilderContext) error {
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// We need forwarding enabled (https://github.com/kubernetes/kubernetes/issues/40182)
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c.AddTask(b.buildFirewallScript())
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c.AddTask(b.buildSystemdService())
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return nil
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}
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func (b *FirewallBuilder) buildSystemdService() *nodetasks.Service {
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manifest := &systemd.Manifest{}
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manifest.Set("Unit", "Description", "Configure iptables for kubernetes")
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manifest.Set("Unit", "Documentation", "https://github.com/kubernetes/kops")
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manifest.Set("Unit", "Before", "network.target")
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manifest.Set("Service", "Type", "oneshot")
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manifest.Set("Service", "RemainAfterExit", "yes")
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manifest.Set("Service", "ExecStart", "/opt/kops/bin/iptables-setup")
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manifest.Set("Install", "WantedBy", "basic.target")
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manifestString := manifest.Render()
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klog.V(8).Infof("Built service manifest %q\n%s", "kubernetes-iptables-setup", manifestString)
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service := &nodetasks.Service{
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Name: "kubernetes-iptables-setup.service",
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Definition: s(manifestString),
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}
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service.InitDefaults()
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return service
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}
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func (b *FirewallBuilder) buildFirewallScript() *nodetasks.File {
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// TODO: Do we want to rely on running nodeup on every boot, or do we want to install systemd units?
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// TODO: The if statement in the script doesn't make it idempotent
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// This is borrowed from gce/gci/configure-helper.sh
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script := `#!/bin/bash
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# Built by kops - do not edit
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# The GCI image has host firewall which drop most inbound/forwarded packets.
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# We need to add rules to accept all TCP/UDP/ICMP packets.
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if iptables -w -L INPUT | grep "Chain INPUT (policy DROP)" > /dev/null; then
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echo "Add rules to accept all inbound TCP/UDP/ICMP packets"
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iptables -A INPUT -w -p TCP -j ACCEPT
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iptables -A INPUT -w -p UDP -j ACCEPT
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iptables -A INPUT -w -p ICMP -j ACCEPT
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fi
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if iptables -w -L FORWARD | grep "Chain FORWARD (policy DROP)" > /dev/null; then
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echo "Add rules to accept all forwarded TCP/UDP/ICMP packets"
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iptables -A FORWARD -w -p TCP -j ACCEPT
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iptables -A FORWARD -w -p UDP -j ACCEPT
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iptables -A FORWARD -w -p ICMP -j ACCEPT
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fi
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`
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return &nodetasks.File{
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Path: "/opt/kops/bin/iptables-setup",
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Contents: fi.NewStringResource(script),
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Type: nodetasks.FileType_File,
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Mode: s("0755"),
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}
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}
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