switch rbac to external

pkg/apis/rbac/v1/evaluation_helpers.go

@@ -0,0 +1,179 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1
+
+import (
+	"fmt"
+	"strings"
+
+	rbacv1 "k8s.io/api/rbac/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func RoleRefGroupKind(roleRef rbacv1.RoleRef) schema.GroupKind {
+	return schema.GroupKind{Group: roleRef.APIGroup, Kind: roleRef.Kind}
+}
+
+func VerbMatches(rule *rbacv1.PolicyRule, requestedVerb string) bool {
+	for _, ruleVerb := range rule.Verbs {
+		if ruleVerb == rbacv1.VerbAll {
+			return true
+		}
+		if ruleVerb == requestedVerb {
+			return true
+		}
+	}
+
+	return false
+}
+
+func APIGroupMatches(rule *rbacv1.PolicyRule, requestedGroup string) bool {
+	for _, ruleGroup := range rule.APIGroups {
+		if ruleGroup == rbacv1.APIGroupAll {
+			return true
+		}
+		if ruleGroup == requestedGroup {
+			return true
+		}
+	}
+
+	return false
+}
+
+func ResourceMatches(rule *rbacv1.PolicyRule, combinedRequestedResource, requestedSubresource string) bool {
+	for _, ruleResource := range rule.Resources {
+		// if everything is allowed, we match
+		if ruleResource == rbacv1.ResourceAll {
+			return true
+		}
+		// if we have an exact match, we match
+		if ruleResource == combinedRequestedResource {
+			return true
+		}
+
+		// We can also match a */subresource.
+		// if there isn't a subresource, then continue
+		if len(requestedSubresource) == 0 {
+			continue
+		}
+		// if the rule isn't in the format */subresource, then we don't match, continue
+		if len(ruleResource) == len(requestedSubresource)+2 &&
+			strings.HasPrefix(ruleResource, "*/") &&
+			strings.HasSuffix(ruleResource, requestedSubresource) {
+			return true
+
+		}
+	}
+
+	return false
+}
+
+func ResourceNameMatches(rule *rbacv1.PolicyRule, requestedName string) bool {
+	if len(rule.ResourceNames) == 0 {
+		return true
+	}
+
+	for _, ruleName := range rule.ResourceNames {
+		if ruleName == requestedName {
+			return true
+		}
+	}
+
+	return false
+}
+
+func NonResourceURLMatches(rule *rbacv1.PolicyRule, requestedURL string) bool {
+	for _, ruleURL := range rule.NonResourceURLs {
+		if ruleURL == rbacv1.NonResourceAll {
+			return true
+		}
+		if ruleURL == requestedURL {
+			return true
+		}
+		if strings.HasSuffix(ruleURL, "*") && strings.HasPrefix(requestedURL, strings.TrimRight(ruleURL, "*")) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// subjectsStrings returns users, groups, serviceaccounts, unknown for display purposes.
+func SubjectsStrings(subjects []rbacv1.Subject) ([]string, []string, []string, []string) {
+	users := []string{}
+	groups := []string{}
+	sas := []string{}
+	others := []string{}
+
+	for _, subject := range subjects {
+		switch subject.Kind {
+		case rbacv1.ServiceAccountKind:
+			sas = append(sas, fmt.Sprintf("%s/%s", subject.Namespace, subject.Name))
+
+		case rbacv1.UserKind:
+			users = append(users, subject.Name)
+
+		case rbacv1.GroupKind:
+			groups = append(groups, subject.Name)
+
+		default:
+			others = append(others, fmt.Sprintf("%s/%s/%s", subject.Kind, subject.Namespace, subject.Name))
+		}
+	}
+
+	return users, groups, sas, others
+}
+
+func String(r rbacv1.PolicyRule) string {
+	return "PolicyRule" + CompactString(r)
+}
+
+// CompactString exposes a compact string representation for use in escalation error messages
+func CompactString(r rbacv1.PolicyRule) string {
+	formatStringParts := []string{}
+	formatArgs := []interface{}{}
+	if len(r.APIGroups) > 0 {
+		formatStringParts = append(formatStringParts, "APIGroups:%q")
+		formatArgs = append(formatArgs, r.APIGroups)
+	}
+	if len(r.Resources) > 0 {
+		formatStringParts = append(formatStringParts, "Resources:%q")
+		formatArgs = append(formatArgs, r.Resources)
+	}
+	if len(r.NonResourceURLs) > 0 {
+		formatStringParts = append(formatStringParts, "NonResourceURLs:%q")
+		formatArgs = append(formatArgs, r.NonResourceURLs)
+	}
+	if len(r.ResourceNames) > 0 {
+		formatStringParts = append(formatStringParts, "ResourceNames:%q")
+		formatArgs = append(formatArgs, r.ResourceNames)
+	}
+	if len(r.Verbs) > 0 {
+		formatStringParts = append(formatStringParts, "Verbs:%q")
+		formatArgs = append(formatArgs, r.Verbs)
+	}
+	formatString := "{" + strings.Join(formatStringParts, ", ") + "}"
+	return fmt.Sprintf(formatString, formatArgs...)
+}
+
+type SortableRuleSlice []rbacv1.PolicyRule
+
+func (s SortableRuleSlice) Len() int      { return len(s) }
+func (s SortableRuleSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+func (s SortableRuleSlice) Less(i, j int) bool {
+	return strings.Compare(s[i].String(), s[j].String()) < 0
+}