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add secure ciphersuites for TLS config #1244

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merged 9 commits into from
Nov 26, 2022
Merged

add secure ciphersuites for TLS config #1244

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383e57c
add secure ciphersuites for TLS config
kangsheng89 Nov 11, 2022
0b2076c
Merge branch 'main' into safeciphersuites
kangsheng89 Nov 14, 2022
20268ba
add comment for the secureCipherSuite function
kangsheng89 Nov 14, 2022
05d3020
Merge branch 'main' into safeciphersuites
kangsheng89 Nov 16, 2022
7d84568
provide more descriptive comments on secureCipherSuite function
kangsheng89 Nov 16, 2022
b74d2de
ciphersuites and tls version setting can be configurable
kangsheng89 Nov 17, 2022
37fd215
add description for the function tlsConfigSetting
kangsheng89 Nov 21, 2022
914c205
Merge branch 'main' into safeciphersuites
kangsheng89 Nov 21, 2022
d424a23
Merge branch 'main' into safeciphersuites
kangsheng89 Nov 22, 2022
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4 changes: 3 additions & 1 deletion go.mod
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ require (
k8s.io/api v0.25.4
k8s.io/apimachinery v0.25.4
k8s.io/client-go v0.25.4
k8s.io/component-base v0.25.4
k8s.io/kubectl v0.25.4
sigs.k8s.io/controller-runtime v0.13.1
)
Expand Down Expand Up @@ -78,6 +79,7 @@ require (
github.com/hashicorp/serf v0.9.5 // indirect
github.com/hetznercloud/hcloud-go v1.26.2 // indirect
github.com/imdario/mergo v0.3.12 // indirect
github.com/inconshreveable/mousetrap v1.0.0 // indirect
github.com/jmespath/go-jmespath v0.4.0 // indirect
github.com/josharian/intern v1.0.0 // indirect
github.com/jpillora/backoff v1.0.0 // indirect
Expand All @@ -103,6 +105,7 @@ require (
github.com/prometheus/procfs v0.7.3 // indirect
github.com/scaleway/scaleway-sdk-go v1.0.0-beta.7.0.20210223165440-c65ae3540d44 // indirect
github.com/sirupsen/logrus v1.8.1 // indirect
github.com/spf13/cobra v1.4.0 // indirect
go.opencensus.io v0.23.0 // indirect
go.opentelemetry.io/otel/trace v1.11.1 // indirect
go.uber.org/atomic v1.8.0 // indirect
Expand All @@ -125,7 +128,6 @@ require (
gopkg.in/inf.v0 v0.9.1 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
k8s.io/apiextensions-apiserver v0.25.0 // indirect
k8s.io/component-base v0.25.4 // indirect
k8s.io/klog/v2 v2.70.1 // indirect
k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect
k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed // indirect
Expand Down
5 changes: 5 additions & 0 deletions go.sum
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,7 @@ github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
Expand Down Expand Up @@ -632,6 +633,7 @@ github.com/imdario/mergo v0.3.4/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJ
github.com/imdario/mergo v0.3.5/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
github.com/influxdata/flux v0.65.0/go.mod h1:BwN2XG2lMszOoquQaFdPET8FRQfrXiZsWmcMO9rkaVY=
github.com/influxdata/flux v0.113.0/go.mod h1:3TJtvbm/Kwuo5/PEo5P6HUzwVg4bXWkb2wPQHPtQdlU=
Expand Down Expand Up @@ -915,6 +917,7 @@ github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFR
github.com/rs/cors v1.6.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
github.com/rs/cors v1.7.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
github.com/ryanuber/columnize v2.1.0+incompatible/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da/go.mod h1:gi+0XIa01GRL2eRQVjQkKGqKF3SF9vZR/HnPullcV2E=
Expand Down Expand Up @@ -947,6 +950,8 @@ github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasO
github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
github.com/spf13/cobra v1.4.0 h1:y+wJpx64xcgO1V+RcnwW0LEHxTKRi2ZDPSBjWnrg88Q=
github.com/spf13/cobra v1.4.0/go.mod h1:Wo4iy3BUC+X2Fybo0PDqwJIv3dNRiZLHQymsfxlB84g=
github.com/spf13/pflag v0.0.0-20170130214245-9ff6c6923cff/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
Expand Down
34 changes: 27 additions & 7 deletions main.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ import (
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
"k8s.io/client-go/tools/record"
k8sapiflag "k8s.io/component-base/cli/flag"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/healthz"
Expand All @@ -51,15 +52,16 @@ import (
// +kubebuilder:scaffold:imports
)

// We should avoid that users unknowingly use a vulnerable TLS version.
// The defaults should be a safe configuration.
const defaultMinTLSVersion = tls.VersionTLS12

var (
scheme = k8sruntime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
)

type tlsConfig struct {
minVersion string
cipherSuites []string
}

func init() {
utilruntime.Must(clientgoscheme.AddToScheme(scheme))

Expand Down Expand Up @@ -88,6 +90,7 @@ func main() {
autoInstrumentationDotNet string
labelsFilter []string
webhookPort int
tlsOpt tlsConfig
)

pflag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
Expand All @@ -103,6 +106,8 @@ func main() {
pflag.StringVar(&autoInstrumentationDotNet, "auto-instrumentation-dotnet-image", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-dotnet:%s", v.AutoInstrumentationDotNet), "The default OpenTelemetry DotNet instrumentation image. This image is used when no image is specified in the CustomResource.")
pflag.StringArrayVar(&labelsFilter, "labels", []string{}, "Labels to filter away from propagating onto deploys")
pflag.IntVar(&webhookPort, "webhook-port", 9443, "The port the webhook endpoint binds to.")
pflag.StringVar(&tlsOpt.minVersion, "tls-min-version", "VersionTLS12", "Minimum TLS version supported. Value must match version names from https://golang.org/pkg/crypto/tls/#pkg-constants.")
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pflag.StringSliceVar(&tlsOpt.cipherSuites, "tls-cipher-suites", nil, "Comma-separated list of cipher suites for the server. Values are from tls package constants (https://golang.org/pkg/crypto/tls/#pkg-constants). If omitted, the default Go cipher suites will be used")
pflag.Parse()

logger := zap.New(zap.UseFlagOptions(&opts))
Expand Down Expand Up @@ -158,7 +163,7 @@ func main() {
retryPeriod := time.Second * 26

optionsTlSOptsFuncs := []func(*tls.Config){
func(config *tls.Config) { minTlsDefault(config) },
func(config *tls.Config) { tlsConfigSetting(config, tlsOpt) },
}

mgrOptions := ctrl.Options{
Expand Down Expand Up @@ -289,6 +294,21 @@ func addDependencies(_ context.Context, mgr ctrl.Manager, cfg config.Config, v v
return nil
}

func minTlsDefault(cfg *tls.Config) {
cfg.MinVersion = defaultMinTLSVersion
// This function get the option from command argument (tlsConfig), check the validity through k8sapiflag
// and set the config for webhook server.
// refer to https://pkg.go.dev/k8s.io/component-base/cli/flag
func tlsConfigSetting(cfg *tls.Config, tlsOpt tlsConfig) {
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// TLSVersion helper function returns the TLS Version ID for the version name passed.
version, err := k8sapiflag.TLSVersion(tlsOpt.minVersion)
if err != nil {
setupLog.Error(err, "TLS version invalid")
}
cfg.MinVersion = version

// TLSCipherSuites helper function returns a list of cipher suite IDs from the cipher suite names passed.
cipherSuiteIDs, err := k8sapiflag.TLSCipherSuites(tlsOpt.cipherSuites)
if err != nil {
setupLog.Error(err, "Failed to convert TLS cipher suite name to ID")
}
cfg.CipherSuites = cipherSuiteIDs
}