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CP/DP Split: Openshift support (#3278)
Problem: Now that we have additional pods in the new architecture, we need the proper SecurityContextConstraints for running in Openshift. Solution: Create an SCC for the cert-generator and an SCC for nginx data plane pods on startup. A Role and RoleBinding are created when deploying nginx to link to the SCC.
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22 files changed

+720
-33
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‎charts/nginx-gateway-fabric/README.md‎

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@@ -115,12 +115,6 @@ To use a NodePort Service instead:
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helm install ngf oci://ghcr.io/nginx/charts/nginx-gateway-fabric --create-namespace -n nginx-gateway --set nginx.service.type=NodePort
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```
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To disable the creation of a Service:
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```shell
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helm install ngf oci://ghcr.io/nginx/charts/nginx-gateway-fabric --create-namespace -n nginx-gateway --set nginx.service.create=false
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```
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## Upgrading the Chart
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> [!NOTE]

‎charts/nginx-gateway-fabric/README.md.gotmpl‎

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@@ -113,12 +113,6 @@ To use a NodePort Service instead:
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helm install ngf oci://ghcr.io/nginx/charts/nginx-gateway-fabric --create-namespace -n nginx-gateway --set nginx.service.type=NodePort
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```
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To disable the creation of a Service:
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```shell
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helm install ngf oci://ghcr.io/nginx/charts/nginx-gateway-fabric --create-namespace -n nginx-gateway --set nginx.service.create=false
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```
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## Upgrading the Chart
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> [!NOTE]

‎charts/nginx-gateway-fabric/templates/certs-job.yaml‎

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@@ -56,6 +56,50 @@ subjects:
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name: {{ include "nginx-gateway.fullname" . }}-cert-generator
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namespace: {{ .Release.Namespace }}
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---
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{{- if .Capabilities.APIVersions.Has "security.openshift.io/v1/SecurityContextConstraints" }}
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kind: SecurityContextConstraints
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apiVersion: security.openshift.io/v1
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metadata:
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name: {{ include "nginx-gateway.scc-name" . }}-cert-generator
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labels:
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{{- include "nginx-gateway.labels" . | nindent 4 }}
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annotations:
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"helm.sh/hook-weight": "-1"
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"helm.sh/hook": pre-install
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allowPrivilegeEscalation: false
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allowHostDirVolumePlugin: false
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allowHostIPC: false
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allowHostNetwork: false
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allowHostPID: false
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allowHostPorts: false
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allowPrivilegedContainer: false
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readOnlyRootFilesystem: true
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runAsUser:
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type: MustRunAsRange
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uidRangeMin: 101
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uidRangeMax: 101
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fsGroup:
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type: MustRunAs
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ranges:
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- min: 1001
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max: 1001
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supplementalGroups:
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type: MustRunAs
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ranges:
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- min: 1001
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max: 1001
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seLinuxContext:
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type: MustRunAs
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seccompProfiles:
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- runtime/default
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users:
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- {{ printf "system:serviceaccount:%s:%s-cert-generator" .Release.Namespace (include "nginx-gateway.fullname" .) }}
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requiredDropCapabilities:
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- ALL
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volumes:
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- projected
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---
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{{- end }}
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apiVersion: batch/v1
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kind: Job
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metadata:

‎charts/nginx-gateway-fabric/templates/clusterrole.yaml‎

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@@ -150,8 +150,19 @@ rules:
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- securitycontextconstraints
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resourceNames:
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- {{ include "nginx-gateway.scc-name" . }}
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- {{ include "nginx-gateway.scc-name" . }}-nginx
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verbs:
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- use
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- apiGroups:
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- rbac.authorization.k8s.io
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resources:
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- roles
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- rolebindings
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verbs:
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- create
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- update
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- delete
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- list
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- get
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- watch
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{{- end }}

‎charts/nginx-gateway-fabric/templates/deployment.yaml‎

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@@ -99,6 +99,9 @@ spec:
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{{- if .Values.nginxGateway.snippetsFilters.enable }}
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- --snippets-filters
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{{- end }}
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{{- if .Capabilities.APIVersions.Has "security.openshift.io/v1/SecurityContextConstraints" }}
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- --nginx-scc={{ include "nginx-gateway.scc-name" . }}-nginx
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{{- end}}
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env:
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- name: POD_NAMESPACE
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valueFrom:

‎charts/nginx-gateway-fabric/templates/scc.yaml‎

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@@ -1,9 +1,10 @@
1-
# TODO(sberman): will need an SCC for nginx ServiceAccounts as well.
21
{{- if .Capabilities.APIVersions.Has "security.openshift.io/v1/SecurityContextConstraints" }}
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kind: SecurityContextConstraints
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apiVersion: security.openshift.io/v1
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metadata:
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name: {{ include "nginx-gateway.scc-name" . }}
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labels:
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{{- include "nginx-gateway.labels" . | nindent 4 }}
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allowPrivilegeEscalation: false
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allowHostDirVolumePlugin: false
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allowHostIPC: false
@@ -36,4 +37,45 @@ requiredDropCapabilities:
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- ALL
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volumes:
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- secret
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---
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kind: SecurityContextConstraints
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apiVersion: security.openshift.io/v1
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metadata:
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name: {{ include "nginx-gateway.scc-name" . }}-nginx
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labels:
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{{- include "nginx-gateway.labels" . | nindent 4 }}
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allowHostDirVolumePlugin: false
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allowHostIPC: false
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allowHostNetwork: false
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allowHostPID: false
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allowHostPorts: false
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allowPrivilegedContainer: false
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readOnlyRootFilesystem: true
54+
runAsUser:
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type: MustRunAsRange
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uidRangeMin: 101
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uidRangeMax: 101
58+
fsGroup:
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type: MustRunAs
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ranges:
61+
- min: 1001
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max: 1001
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supplementalGroups:
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type: MustRunAs
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ranges:
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- min: 1001
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max: 1001
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seLinuxContext:
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type: MustRunAs
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seccompProfiles:
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- runtime/default
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allowedCapabilities:
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- NET_BIND_SERVICE
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requiredDropCapabilities:
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- ALL
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volumes:
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- emptyDir
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- secret
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- configMap
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- projected
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{{- end }}

‎cmd/gateway/commands.go‎

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@@ -81,6 +81,7 @@ func createControllerCommand() *cobra.Command {
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usageReportClientSSLSecretFlag = "usage-report-client-ssl-secret" //nolint:gosec // not credentials
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usageReportCASecretFlag = "usage-report-ca-secret" //nolint:gosec // not credentials
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snippetsFiltersFlag = "snippets-filters"
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nginxSCCFlag = "nginx-scc"
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)
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8687
// flag values
@@ -105,6 +106,9 @@ func createControllerCommand() *cobra.Command {
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validator: validateResourceName,
106107
value: agentTLSSecret,
107108
}
109+
nginxSCCName = stringValidatingValue{
110+
validator: validateResourceName,
111+
}
108112
disableMetrics bool
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metricsSecure bool
110114
metricsListenPort = intValidatingValue{
@@ -264,6 +268,7 @@ func createControllerCommand() *cobra.Command {
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SnippetsFilters: snippetsFilters,
265269
NginxDockerSecretNames: nginxDockerSecrets.values,
266270
AgentTLSSecretName: agentTLSSecretName.value,
271+
NGINXSCCName: nginxSCCName.value,
267272
}
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269274
if err := static.StartManager(conf); err != nil {
@@ -457,6 +462,13 @@ func createControllerCommand() *cobra.Command {
457462
"generated NGINX config for HTTPRoute and GRPCRoute resources.",
458463
)
459464

465+
cmd.Flags().Var(
466+
&nginxSCCName,
467+
nginxSCCFlag,
468+
`The name of the SecurityContextConstraints to be used with the NGINX data plane Pods.`+
469+
` Only applicable in OpenShift.`,
470+
)
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return cmd
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}
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‎cmd/gateway/commands_test.go‎

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@@ -158,6 +158,7 @@ func TestControllerCmdFlagValidation(t *testing.T) {
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"--usage-report-ca-secret=ca-secret",
159159
"--usage-report-client-ssl-secret=client-secret",
160160
"--snippets-filters",
161+
"--nginx-scc=nginx-sscc-name",
161162
},
162163
wantErr: false,
163164
},
@@ -445,6 +446,22 @@ func TestControllerCmdFlagValidation(t *testing.T) {
445446
},
446447
wantErr: true,
447448
},
449+
{
450+
name: "nginx-scc is set to empty string",
451+
args: []string{
452+
"--nginx-scc=",
453+
},
454+
wantErr: true,
455+
expectedErrPrefix: `invalid argument "" for "--nginx-scc" flag: must be set`,
456+
},
457+
{
458+
name: "nginx-scc is invalid",
459+
args: []string{
460+
"--nginx-scc=!@#$",
461+
},
462+
wantErr: true,
463+
expectedErrPrefix: `invalid argument "!@#$" for "--nginx-scc" flag: invalid format: `,
464+
},
448465
}
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450467
// common flags validation is tested separately

‎deploy/openshift/deploy.yaml‎

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@@ -175,11 +175,22 @@ rules:
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- security.openshift.io
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resourceNames:
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- nginx-gateway-scc
178+
- nginx-gateway-scc-nginx
178179
resources:
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- securitycontextconstraints
180181
verbs:
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- use
183+
- apiGroups:
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- rbac.authorization.k8s.io
185+
resources:
186+
- roles
187+
- rolebindings
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verbs:
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- create
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- update
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- delete
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- list
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- get
183194
- watch
184195
---
185196
apiVersion: rbac.authorization.k8s.io/v1
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272283
- --metrics-port=9113
273284
- --health-port=8081
274285
- --leader-election-lock-name=nginx-gateway-leader-election
286+
- --nginx-scc=nginx-gateway-scc-nginx
275287
env:
276288
- name: POD_NAMESPACE
277289
valueFrom:
@@ -442,6 +454,10 @@ fsGroup:
442454
type: MustRunAs
443455
kind: SecurityContextConstraints
444456
metadata:
457+
labels:
458+
app.kubernetes.io/instance: nginx-gateway
459+
app.kubernetes.io/name: nginx-gateway
460+
app.kubernetes.io/version: edge
445461
name: nginx-gateway-scc
446462
readOnlyRootFilesystem: true
447463
requiredDropCapabilities:
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463479
- system:serviceaccount:nginx-gateway:nginx-gateway
464480
volumes:
465481
- secret
482+
---
483+
allowHostDirVolumePlugin: false
484+
allowHostIPC: false
485+
allowHostNetwork: false
486+
allowHostPID: false
487+
allowHostPorts: false
488+
allowPrivilegeEscalation: false
489+
allowPrivilegedContainer: false
490+
apiVersion: security.openshift.io/v1
491+
fsGroup:
492+
ranges:
493+
- max: 1001
494+
min: 1001
495+
type: MustRunAs
496+
kind: SecurityContextConstraints
497+
metadata:
498+
labels:
499+
app.kubernetes.io/instance: nginx-gateway
500+
app.kubernetes.io/name: nginx-gateway
501+
app.kubernetes.io/version: edge
502+
name: nginx-gateway-scc-cert-generator
503+
readOnlyRootFilesystem: true
504+
requiredDropCapabilities:
505+
- ALL
506+
runAsUser:
507+
type: MustRunAsRange
508+
uidRangeMax: 101
509+
uidRangeMin: 101
510+
seLinuxContext:
511+
type: MustRunAs
512+
seccompProfiles:
513+
- runtime/default
514+
supplementalGroups:
515+
ranges:
516+
- max: 1001
517+
min: 1001
518+
type: MustRunAs
519+
users:
520+
- system:serviceaccount:nginx-gateway:nginx-gateway-cert-generator
521+
volumes:
522+
- projected
523+
---
524+
allowHostDirVolumePlugin: false
525+
allowHostIPC: false
526+
allowHostNetwork: false
527+
allowHostPID: false
528+
allowHostPorts: false
529+
allowPrivilegedContainer: false
530+
allowedCapabilities:
531+
- NET_BIND_SERVICE
532+
apiVersion: security.openshift.io/v1
533+
fsGroup:
534+
ranges:
535+
- max: 1001
536+
min: 1001
537+
type: MustRunAs
538+
kind: SecurityContextConstraints
539+
metadata:
540+
labels:
541+
app.kubernetes.io/instance: nginx-gateway
542+
app.kubernetes.io/name: nginx-gateway
543+
app.kubernetes.io/version: edge
544+
name: nginx-gateway-scc-nginx
545+
readOnlyRootFilesystem: true
546+
requiredDropCapabilities:
547+
- ALL
548+
runAsUser:
549+
type: MustRunAsRange
550+
uidRangeMax: 101
551+
uidRangeMin: 101
552+
seLinuxContext:
553+
type: MustRunAs
554+
seccompProfiles:
555+
- runtime/default
556+
supplementalGroups:
557+
ranges:
558+
- max: 1001
559+
min: 1001
560+
type: MustRunAs
561+
volumes:
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- emptyDir
563+
- secret
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- configMap
565+
- projected

‎internal/mode/static/config/config.go‎

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@@ -34,6 +34,8 @@ type Config struct {
3434
GatewayClassName string
3535
// AgentTLSSecretName is the name of the TLS Secret used by NGINX Agent to communicate with the control plane.
3636
AgentTLSSecretName string
37+
// NGINXSCCName is the name of the SecurityContextConstraints for the NGINX Pods. Only applicable in OpenShift.
38+
NGINXSCCName string
3739
// NginxDockerSecretNames are the names of any Docker registry Secrets for the NGINX container.
3840
NginxDockerSecretNames []string
3941
// LeaderElection contains the configuration for leader election.

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