Backport: Remove anyuid SCC requirement for OpenShift (#3813) (#3851)

Remove anyuid SCC requirement for OpenShift (#3813)

Remove SCC requirement for anyuid for OpenShift

.changelog/3813.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+control-plane: Remove anyuid Security Context Constraints (SCC) requirement in OpenShift.
+```

acceptance/tests/fixtures/bases/multiport-app/kustomization.yaml

@@ -7,5 +7,4 @@ resources:
   - secret.yaml
   - serviceaccount.yaml
   - psp-rolebinding.yaml
-  - anyuid-scc-rolebinding.yaml
-  - privileged-scc-rolebinding.yaml
+  - privileged-scc-rolebinding.yaml

acceptance/tests/fixtures/bases/static-client/kustomization.yaml

@@ -6,5 +6,4 @@ resources:
   - service.yaml
   - serviceaccount.yaml
   - psp-rolebinding.yaml
-  - anyuid-scc-rolebinding.yaml
-  - privileged-scc-rolebinding.yaml
+  - privileged-scc-rolebinding.yaml

acceptance/tests/fixtures/bases/static-server-https/kustomization.yaml

@@ -7,5 +7,4 @@ resources:
   - service.yaml
   - serviceaccount.yaml
   - psp-rolebinding.yaml
-  - anyuid-scc-rolebinding.yaml
-  - privileged-scc-rolebinding.yaml
+  - privileged-scc-rolebinding.yaml

acceptance/tests/fixtures/bases/static-server-tcp/kustomization.yaml

@@ -7,5 +7,4 @@ resources:
   - serviceaccount.yaml
   - servicedefaults.yaml
   - psp-rolebinding.yaml
-  - anyuid-scc-rolebinding.yaml
-  - privileged-scc-rolebinding.yaml
+  - privileged-scc-rolebinding.yaml

acceptance/tests/fixtures/bases/static-server/kustomization.yaml

@@ -6,5 +6,4 @@ resources:
   - service.yaml
   - serviceaccount.yaml
   - psp-rolebinding.yaml
-  - anyuid-scc-rolebinding.yaml
-  - privileged-scc-rolebinding.yaml
+  - privileged-scc-rolebinding.yaml

control-plane/connect-inject/common/openshift.go

@@ -0,0 +1,130 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+// Function copied from:
+// https://github.com/openshift/apiserver-library-go/blob/release-4.17/pkg/securitycontextconstraints/sccmatching/matcher.go
+// Apache 2.0 license: https://github.com/openshift/apiserver-library-go/blob/release-4.17/LICENSE
+
+// A namespace in OpenShift has the following annotations:
+// Annotations:  openshift.io/sa.scc.mcs: s0:c27,c4
+//               openshift.io/sa.scc.uid-range: 1000710000/10000
+//               openshift.io/sa.scc.supplemental-groups: 1000710000/10000
+//
+// Note: Even though the annotation is named 'range', it is not a range but the ID you should use. All pods in a
+// namespace should use the same UID/GID. (1000710000/1000710000 above)
+
+package common
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/hashicorp/consul-k8s/control-plane/connect-inject/constants"
+	corev1 "k8s.io/api/core/v1"
+)
+
+// GetOpenShiftUID gets the user id from the OpenShift annotation 'openshift.io/sa.scc.uid-range'.
+func GetOpenShiftUID(ns *corev1.Namespace) (int64, error) {
+	annotation, ok := ns.Annotations[constants.AnnotationOpenShiftUIDRange]
+	if !ok {
+		return 0, fmt.Errorf("unable to find annotation %s", constants.AnnotationOpenShiftUIDRange)
+	}
+	if len(annotation) == 0 {
+		return 0, fmt.Errorf("found annotation %s but it was empty", constants.AnnotationOpenShiftUIDRange)
+	}
+
+	uid, err := parseOpenShiftUID(annotation)
+	if err != nil {
+		return 0, err
+	}
+
+	return uid, nil
+}
+
+// parseOpenShiftUID parses the UID "range" from the annotation string. The annotation can either have a '/' or '-'
+// as a separator. '-' is the old style of UID from when it used to be an actual range.
+// Example annotation value: "1000700000/100000".
+func parseOpenShiftUID(val string) (int64, error) {
+	var uid int64
+	var err error
+	if strings.Contains(val, "/") {
+		str := strings.Split(val, "/")
+		uid, err = strconv.ParseInt(str[0], 10, 64)
+		if err != nil {
+			return 0, err
+		}
+	}
+	if strings.Contains(val, "-") {
+		str := strings.Split(val, "-")
+		uid, err = strconv.ParseInt(str[0], 10, 64)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	if !strings.Contains(val, "/") && !strings.Contains(val, "-") {
+		return 0, fmt.Errorf(
+			"annotation %s contains an invalid format for value %s",
+			constants.AnnotationOpenShiftUIDRange,
+			val,
+		)
+	}
+
+	return uid, nil
+}
+
+// GetOpenShiftGroup gets the group from OpenShift annotation 'openshift.io/sa.scc.supplemental-groups'
+// Fall back to the UID annotation if the group annotation does not exist. The values should
+// be the same.
+func GetOpenShiftGroup(ns *corev1.Namespace) (int64, error) {
+	annotation, ok := ns.Annotations[constants.AnnotationOpenShiftGroups]
+	if !ok {
+		// fall back to UID annotation
+		annotation, ok = ns.Annotations[constants.AnnotationOpenShiftUIDRange]
+		if !ok {
+			return 0, fmt.Errorf(
+				"unable to find annotation %s or %s",
+				constants.AnnotationOpenShiftGroups,
+				constants.AnnotationOpenShiftUIDRange,
+			)
+		}
+	}
+	if len(annotation) == 0 {
+		return 0, fmt.Errorf("found annotation %s but it was empty", constants.AnnotationOpenShiftGroups)
+	}
+
+	uid, err := parseOpenShiftGroup(annotation)
+	if err != nil {
+		return 0, err
+	}
+
+	return uid, nil
+}
+
+// parseOpenShiftGroup parses the group from the annotation string. The annotation can either have a '/' or ','
+// as a separator. ',' is the old style of UID from when it used to be an actual range.
+func parseOpenShiftGroup(val string) (int64, error) {
+	var group int64
+	var err error
+	if strings.Contains(val, "/") {
+		str := strings.Split(val, "/")
+		group, err = strconv.ParseInt(str[0], 10, 64)
+		if err != nil {
+			return 0, err
+		}
+	}
+	if strings.Contains(val, ",") {
+		str := strings.Split(val, ",")
+		group, err = strconv.ParseInt(str[0], 10, 64)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	if !strings.Contains(val, "/") && !strings.Contains(val, ",") {
+		return 0, fmt.Errorf("annotation %s contains an invalid format for value %s", constants.AnnotationOpenShiftGroups, val)
+	}
+
+	return group, nil
+}