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ns_client.go
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/
ns_client.go
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// Copyright (c) 2022-2023 Cisco and/or its affiliates.
//
// SPDX-License-Identifier: Apache-2.0
//
// 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 authorize provides authz checks for incoming or returning connections.
package authorize
import (
"context"
"github.com/edwarnicke/genericsync"
"github.com/golang/protobuf/ptypes/empty"
"github.com/pkg/errors"
"google.golang.org/grpc"
"google.golang.org/grpc/peer"
"github.com/networkservicemesh/api/pkg/api/registry"
"github.com/networkservicemesh/sdk/pkg/registry/common/grpcmetadata"
"github.com/networkservicemesh/sdk/pkg/registry/core/next"
"github.com/networkservicemesh/sdk/pkg/tools/postpone"
)
type authorizeNSClient struct {
policies policiesList
nsPathIdsMap *genericsync.Map[string, []string]
}
// NewNetworkServiceRegistryClient - returns a new authorization registry.NetworkServiceRegistryClient
// Authorize registry client checks spiffeID of NS.
func NewNetworkServiceRegistryClient(opts ...Option) registry.NetworkServiceRegistryClient {
o := &options{
resourcePathIdsMap: new(genericsync.Map[string, []string]),
}
for _, opt := range opts {
opt(o)
}
return &authorizeNSClient{
policies: o.policies,
nsPathIdsMap: o.resourcePathIdsMap,
}
}
func (c *authorizeNSClient) Register(ctx context.Context, ns *registry.NetworkService, opts ...grpc.CallOption) (*registry.NetworkService, error) {
if len(c.policies) == 0 {
return next.NetworkServiceRegistryClient(ctx).Register(ctx, ns, opts...)
}
path := grpcmetadata.PathFromContext(ctx)
ctx = grpcmetadata.PathWithContext(ctx, path)
var p peer.Peer
opts = append(opts, grpc.Peer(&p))
postponeCtxFunc := postpone.ContextWithValues(ctx)
resp, err := next.NetworkServiceRegistryClient(ctx).Register(ctx, ns, opts...)
if err != nil {
return nil, err
}
if p != (peer.Peer{}) {
ctx = peer.NewContext(ctx, &p)
}
path = grpcmetadata.PathFromContext(ctx)
spiffeID := getSpiffeIDFromPath(ctx, path)
rawMap := getRawMap(c.nsPathIdsMap)
input := RegistryOpaInput{
ResourceID: spiffeID.String(),
ResourceName: resp.Name,
ResourcePathIdsMap: rawMap,
PathSegments: path.PathSegments,
Index: path.Index,
}
if err := c.policies.check(ctx, input); err != nil {
if _, load := c.nsPathIdsMap.Load(resp.Name); !load {
unregisterCtx, cancelUnregister := postponeCtxFunc()
defer cancelUnregister()
if _, unregisterErr := next.NetworkServiceRegistryClient(ctx).Unregister(unregisterCtx, resp, opts...); unregisterErr != nil {
err = errors.Wrapf(err, "nse unregistered with error: %s", unregisterErr.Error())
}
}
return nil, err
}
c.nsPathIdsMap.Store(resp.Name, resp.PathIds)
return resp, nil
}
func (c *authorizeNSClient) Find(ctx context.Context, query *registry.NetworkServiceQuery, opts ...grpc.CallOption) (registry.NetworkServiceRegistry_FindClient, error) {
return next.NetworkServiceRegistryClient(ctx).Find(ctx, query, opts...)
}
func (c *authorizeNSClient) Unregister(ctx context.Context, ns *registry.NetworkService, opts ...grpc.CallOption) (*empty.Empty, error) {
if len(c.policies) == 0 {
return next.NetworkServiceRegistryClient(ctx).Unregister(ctx, ns, opts...)
}
path := grpcmetadata.PathFromContext(ctx)
ctx = grpcmetadata.PathWithContext(ctx, path)
var p peer.Peer
opts = append(opts, grpc.Peer(&p))
resp, err := next.NetworkServiceRegistryClient(ctx).Unregister(ctx, ns, opts...)
if err != nil {
return nil, err
}
if p != (peer.Peer{}) {
ctx = peer.NewContext(ctx, &p)
}
spiffeID := getSpiffeIDFromPath(ctx, path)
rawMap := getRawMap(c.nsPathIdsMap)
input := RegistryOpaInput{
ResourceID: spiffeID.String(),
ResourceName: ns.Name,
ResourcePathIdsMap: rawMap,
PathSegments: path.PathSegments,
Index: path.Index,
}
if err := c.policies.check(ctx, input); err != nil {
return nil, err
}
c.nsPathIdsMap.Delete(ns.Name)
return resp, nil
}