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builder.go
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builder.go
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// Copyright Istio 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 builder
import (
"context"
"fmt"
"google.golang.org/protobuf/types/known/anypb"
dubborulepb "github.com/aeraki-framework/aeraki/api/dubbo/v1alpha1"
dubboapi "github.com/aeraki-framework/aeraki/client-go/pkg/apis/dubbo/v1alpha1"
dubboclient "github.com/aeraki-framework/aeraki/client-go/pkg/clientset/versioned/typed/dubbo/v1alpha1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
authzmodel "github.com/aeraki-framework/aeraki/plugin/dubbo/authz/model"
rbacpb "github.com/envoyproxy/go-control-plane/envoy/config/rbac/v3"
dubbopb "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/dubbo_proxy/v3"
rbacdubbopb "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/rbac/v3"
"istio.io/istio/pilot/pkg/security/trustdomain"
"istio.io/pkg/log"
)
var (
authzLog = log.RegisterScope("authorization", "Aeraki Dubbo Authorization Policy", 0)
)
// Builder builds Istio authorization policy to Envoy RBAC filter.
type Builder struct {
trustDomainBundle trustdomain.Bundle
denyPolicies []dubboapi.DubboAuthorizationPolicy
allowPolicies []dubboapi.DubboAuthorizationPolicy
}
// New returns a new builder for the given workload with the authorization policy.
// Returns nil if none of the authorization policies are enabled for the workload.
func New(trustDomainBundle trustdomain.Bundle, namespace string,
client dubboclient.DubboV1alpha1Interface) *Builder {
allowPolicies := make([]dubboapi.DubboAuthorizationPolicy, 0)
denyPolicies := make([]dubboapi.DubboAuthorizationPolicy, 0)
dubboAuthorizationPolicyList, err := client.DubboAuthorizationPolicies(namespace).List(context.TODO(),
v1.ListOptions{})
if err != nil {
authzLog.Errorf("failed to list DubboAuthorizationPolicy: %v", err)
} else {
for _, config := range dubboAuthorizationPolicyList.Items {
switch config.Spec.GetAction() {
case dubborulepb.DubboAuthorizationPolicy_ALLOW:
allowPolicies = append(allowPolicies, config)
case dubborulepb.DubboAuthorizationPolicy_DENY:
denyPolicies = append(denyPolicies, config)
default:
log.Errorf("ignored authorization policy %s.%s with unsupported action: %s",
config.Namespace, config.Name, config.Spec.GetAction())
}
}
}
return &Builder{
trustDomainBundle: trustDomainBundle,
denyPolicies: denyPolicies,
allowPolicies: allowPolicies,
}
}
// BuildDubboFilter returns the RBAC TCP filters built from the authorization policy.
func (b Builder) BuildDubboFilter() []*dubbopb.DubboFilter {
filters := make([]*dubbopb.DubboFilter, 0)
if denyConfig := build(b.denyPolicies, b.trustDomainBundle, rbacpb.RBAC_DENY); denyConfig != nil {
filters = append(filters, createDubboRBACFilter(denyConfig))
}
if allowConfig := build(b.allowPolicies, b.trustDomainBundle, rbacpb.RBAC_ALLOW); allowConfig != nil {
filters = append(filters, createDubboRBACFilter(allowConfig))
}
return filters
}
func build(policies []dubboapi.DubboAuthorizationPolicy, tdBundle trustdomain.Bundle,
action rbacpb.RBAC_Action) *rbacpb.RBAC {
if len(policies) == 0 {
return nil
}
rules := &rbacpb.RBAC{
Action: action,
Policies: map[string]*rbacpb.Policy{},
}
for _, policy := range policies {
for i, rule := range policy.Spec.Rules {
name := fmt.Sprintf("ns[%s]-policy[%s]-rule[%d]", policy.Namespace, policy.Name, i)
if rule == nil {
authzLog.Errorf("skipped nil rule %s", name)
continue
}
m, err := authzmodel.New(rule)
if err != nil {
authzLog.Errorf("skipped rule %s: %v", name, err)
continue
}
m.MigrateTrustDomain(tdBundle)
generated, err := m.Generate(action)
if err != nil {
authzLog.Errorf("skipped rule %s: %v", name, err)
continue
}
if generated != nil {
rules.Policies[name] = generated
authzLog.Debugf("rule %s generated policy: %+v", name, generated)
}
}
}
return rules
}
func createDubboRBACFilter(config *rbacpb.RBAC) *dubbopb.DubboFilter {
if config == nil {
return nil
}
rbacConfig := &rbacdubbopb.RBAC{
Rules: config,
StatPrefix: authzmodel.RBACDubboFilterStatPrefix,
}
rbacPolicyInAny, _ := anypb.New(rbacConfig)
return &dubbopb.DubboFilter{
Name: authzmodel.RBACDUBBOFilterName,
Config: rbacPolicyInAny,
}
}