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feat: implement ingress firewall rules
Fixes siderolabs#4421 Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
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187 changes: 187 additions & 0 deletions
187
internal/app/machined/pkg/controllers/network/nftables_chain_config.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,187 @@ | ||
| // 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/. | ||
|
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| package network | ||
|
|
||
| import ( | ||
| "cmp" | ||
| "context" | ||
| "fmt" | ||
| "slices" | ||
|
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| "github.com/cosi-project/runtime/pkg/controller" | ||
| "github.com/cosi-project/runtime/pkg/safe" | ||
| "github.com/cosi-project/runtime/pkg/state" | ||
| "github.com/siderolabs/gen/optional" | ||
| "github.com/siderolabs/gen/xslices" | ||
| "github.com/siderolabs/go-pointer" | ||
| "go.uber.org/zap" | ||
|
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| v1alpha1runtime "github.com/siderolabs/talos/internal/app/machined/pkg/runtime" | ||
| "github.com/siderolabs/talos/pkg/machinery/constants" | ||
| "github.com/siderolabs/talos/pkg/machinery/nethelpers" | ||
| "github.com/siderolabs/talos/pkg/machinery/resources/config" | ||
| "github.com/siderolabs/talos/pkg/machinery/resources/network" | ||
| ) | ||
|
|
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| // NfTablesChainConfigController generates configuration for kmsg log delivery. | ||
| type NfTablesChainConfigController struct { | ||
| V1Alpha1Mode v1alpha1runtime.Mode | ||
| } | ||
|
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| // Name implements controller.Controller interface. | ||
| func (ctrl *NfTablesChainConfigController) Name() string { | ||
| return "network.NfTablesChainConfigController" | ||
| } | ||
|
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| // Inputs implements controller.Controller interface. | ||
| func (ctrl *NfTablesChainConfigController) Inputs() []controller.Input { | ||
| return []controller.Input{ | ||
| { | ||
| Namespace: config.NamespaceName, | ||
| Type: config.MachineConfigType, | ||
| ID: optional.Some(config.V1Alpha1ID), | ||
| Kind: controller.InputWeak, | ||
| }, | ||
| } | ||
| } | ||
|
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| // Outputs implements controller.Controller interface. | ||
| func (ctrl *NfTablesChainConfigController) Outputs() []controller.Output { | ||
| return []controller.Output{ | ||
| { | ||
| Type: network.NfTablesChainType, | ||
| Kind: controller.OutputShared, | ||
| }, | ||
| } | ||
| } | ||
|
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| // Run implements controller.Controller interface. | ||
| // | ||
| //nolint:gocyclo | ||
| func (ctrl *NfTablesChainConfigController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) (err error) { | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return nil | ||
| case <-r.EventCh(): | ||
| } | ||
|
|
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| cfg, err := safe.ReaderGetByID[*config.MachineConfig](ctx, r, config.V1Alpha1ID) | ||
| if err != nil && !state.IsNotFoundError(err) { | ||
| return fmt.Errorf("error getting machine config: %w", err) | ||
| } | ||
|
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| r.StartTrackingOutputs() | ||
|
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| if cfg != nil { | ||
| if err = safe.WriterModify(ctx, r, network.NewNfTablesChain(network.NamespaceName, "ingress"), | ||
| func(chain *network.NfTablesChain) error { | ||
| spec := chain.TypedSpec() | ||
|
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| spec.Type = nethelpers.ChainTypeFilter | ||
| spec.Hook = nethelpers.ChainHookInput | ||
| spec.Priority = nethelpers.ChainPriorityFilter | ||
|
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| // preamble | ||
| spec.Rules = []network.NfTablesRule{ | ||
| // trusted interfaces: loopback, siderolink and kubespan | ||
| { | ||
| MatchIIfName: &network.NfTablesIfNameMatch{ | ||
| InterfaceName: "lo", | ||
| Operator: nethelpers.OperatorEqual, | ||
| }, | ||
| Verdict: pointer.To(nethelpers.VerdictAccept), | ||
| }, | ||
| { | ||
| MatchIIfName: &network.NfTablesIfNameMatch{ | ||
| InterfaceName: constants.SideroLinkName, | ||
| Operator: nethelpers.OperatorEqual, | ||
| }, | ||
| Verdict: pointer.To(nethelpers.VerdictAccept), | ||
| }, | ||
| { | ||
| MatchIIfName: &network.NfTablesIfNameMatch{ | ||
| InterfaceName: constants.KubeSpanLinkName, | ||
| Operator: nethelpers.OperatorEqual, | ||
| }, | ||
| Verdict: pointer.To(nethelpers.VerdictAccept), | ||
| }, | ||
| } | ||
|
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| defaultAction := cfg.Config().NetworkRules().DefaultAction() | ||
|
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| if defaultAction == nethelpers.DefaultActionBlock { | ||
| // allow ICMP and ICMPv6 explicitly | ||
| spec.Rules = append(spec.Rules, | ||
| network.NfTablesRule{ | ||
| MatchLayer4: &network.NfTablesLayer4Match{ | ||
| Protocol: nethelpers.ProtocolICMP, | ||
| }, | ||
| Verdict: pointer.To(nethelpers.VerdictAccept), | ||
| }, | ||
| network.NfTablesRule{ | ||
| MatchLayer4: &network.NfTablesLayer4Match{ | ||
| Protocol: nethelpers.ProtocolICMPv6, | ||
| }, | ||
| Verdict: pointer.To(nethelpers.VerdictAccept), | ||
| }, | ||
| ) | ||
| } | ||
|
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| for _, rule := range cfg.Config().NetworkRules().Rules() { | ||
| portRanges := rule.PortRanges() | ||
|
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| // sort port ranges, machine config validation ensures that there are no overlaps | ||
| slices.SortFunc(portRanges, func(a, b [2]uint16) int { | ||
| return cmp.Compare(a[0], b[0]) | ||
| }) | ||
|
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| // if default accept, drop anything that doesn't match the rule | ||
| verdict := nethelpers.VerdictDrop | ||
|
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| if defaultAction == nethelpers.DefaultActionBlock { | ||
| verdict = nethelpers.VerdictAccept | ||
| } | ||
|
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| spec.Rules = append(spec.Rules, | ||
| network.NfTablesRule{ | ||
| MatchSourceAddress: &network.NfTablesAddressMatch{ | ||
| IncludeSubnets: rule.Subnets(), | ||
| ExcludeSubnets: rule.ExceptSubnets(), | ||
| Invert: defaultAction == nethelpers.DefaultActionAccept, | ||
| }, | ||
| MatchLayer4: &network.NfTablesLayer4Match{ | ||
| Protocol: rule.Protocol(), | ||
| MatchDestinationPort: &network.NfTablesPortMatch{ | ||
| Ranges: xslices.Map(portRanges, func(pr [2]uint16) network.PortRange { | ||
| return network.PortRange{Lo: pr[0], Hi: pr[1]} | ||
| }), | ||
| }, | ||
| }, | ||
| Verdict: pointer.To(verdict), | ||
| }, | ||
| ) | ||
| } | ||
|
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| if defaultAction == nethelpers.DefaultActionBlock { | ||
| // drop everything else | ||
| spec.Rules = append(spec.Rules, | ||
| network.NfTablesRule{ | ||
| Verdict: pointer.To(nethelpers.VerdictDrop), | ||
| }, | ||
| ) | ||
| } | ||
|
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| return nil | ||
| }); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
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| if err = safe.CleanupOutputs[*network.NfTablesChain](ctx, r); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } |
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