mirror of https://github.com/grpc/grpc-go.git
113 lines
3.6 KiB
Go
113 lines
3.6 KiB
Go
/*
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*
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* Copyright 2020 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 local implements local transport credentials.
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// Local credentials reports the security level based on the type
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// of connetion. If the connection is local TCP, NoSecurity will be
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// reported, and if the connection is UDS, PrivacyAndIntegrity will be
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// reported. If local credentials is not used in local connections
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// (local TCP or UDS), it will fail.
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//
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// # Experimental
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//
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// Notice: This package is EXPERIMENTAL and may be changed or removed in a
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// later release.
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package local
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import (
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"context"
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"fmt"
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"net"
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"strings"
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"google.golang.org/grpc/credentials"
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)
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// info contains the auth information for a local connection.
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// It implements the AuthInfo interface.
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type info struct {
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credentials.CommonAuthInfo
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}
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// AuthType returns the type of info as a string.
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func (info) AuthType() string {
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return "local"
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}
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// localTC is the credentials required to establish a local connection.
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type localTC struct {
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info credentials.ProtocolInfo
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}
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func (c *localTC) Info() credentials.ProtocolInfo {
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return c.info
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}
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// getSecurityLevel returns the security level for a local connection.
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// It returns an error if a connection is not local.
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func getSecurityLevel(network, addr string) (credentials.SecurityLevel, error) {
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switch {
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// Local TCP connection
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case strings.HasPrefix(addr, "127."), strings.HasPrefix(addr, "[::1]:"):
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return credentials.NoSecurity, nil
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// UDS connection
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case network == "unix":
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return credentials.PrivacyAndIntegrity, nil
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// Not a local connection and should fail
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default:
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return credentials.InvalidSecurityLevel, fmt.Errorf("local credentials rejected connection to non-local address %q", addr)
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}
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}
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func (*localTC) ClientHandshake(ctx context.Context, authority string, conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
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secLevel, err := getSecurityLevel(conn.RemoteAddr().Network(), conn.RemoteAddr().String())
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if err != nil {
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return nil, nil, err
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}
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return conn, info{credentials.CommonAuthInfo{SecurityLevel: secLevel}}, nil
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}
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func (*localTC) ServerHandshake(conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
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secLevel, err := getSecurityLevel(conn.RemoteAddr().Network(), conn.RemoteAddr().String())
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if err != nil {
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return nil, nil, err
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}
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return conn, info{credentials.CommonAuthInfo{SecurityLevel: secLevel}}, nil
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}
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// NewCredentials returns a local credential implementing credentials.TransportCredentials.
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func NewCredentials() credentials.TransportCredentials {
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return &localTC{
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info: credentials.ProtocolInfo{
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SecurityProtocol: "local",
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},
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}
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}
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// Clone makes a copy of Local credentials.
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func (c *localTC) Clone() credentials.TransportCredentials {
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return &localTC{info: c.info}
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}
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// OverrideServerName overrides the server name used to verify the hostname on the returned certificates from the server.
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// Since this feature is specific to TLS (SNI + hostname verification check), it does not take any effet for local credentials.
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func (c *localTC) OverrideServerName(serverNameOverride string) error {
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c.info.ServerName = serverNameOverride
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return nil
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}
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