forked from TrueCloudLab/distribution
71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
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/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package alts
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import (
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"context"
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"errors"
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"strings"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/peer"
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"google.golang.org/grpc/status"
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)
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// AuthInfoFromContext extracts the alts.AuthInfo object from the given context,
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// if it exists. This API should be used by gRPC server RPC handlers to get
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// information about the communicating peer. For client-side, use grpc.Peer()
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// CallOption.
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func AuthInfoFromContext(ctx context.Context) (AuthInfo, error) {
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p, ok := peer.FromContext(ctx)
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if !ok {
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return nil, errors.New("no Peer found in Context")
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}
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return AuthInfoFromPeer(p)
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}
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// AuthInfoFromPeer extracts the alts.AuthInfo object from the given peer, if it
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// exists. This API should be used by gRPC clients after obtaining a peer object
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// using the grpc.Peer() CallOption.
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func AuthInfoFromPeer(p *peer.Peer) (AuthInfo, error) {
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altsAuthInfo, ok := p.AuthInfo.(AuthInfo)
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if !ok {
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return nil, errors.New("no alts.AuthInfo found in Peer")
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}
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return altsAuthInfo, nil
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}
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// ClientAuthorizationCheck checks whether the client is authorized to access
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// the requested resources based on the given expected client service accounts.
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// This API should be used by gRPC server RPC handlers. This API should not be
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// used by clients.
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func ClientAuthorizationCheck(ctx context.Context, expectedServiceAccounts []string) error {
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authInfo, err := AuthInfoFromContext(ctx)
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if err != nil {
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return status.Errorf(codes.PermissionDenied, "The context is not an ALTS-compatible context: %v", err)
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}
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peer := authInfo.PeerServiceAccount()
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for _, sa := range expectedServiceAccounts {
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if strings.EqualFold(peer, sa) {
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return nil
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}
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}
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return status.Errorf(codes.PermissionDenied, "Client %v is not authorized", peer)
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}
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