230 lines
8.5 KiB
Go
230 lines
8.5 KiB
Go
/*
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*
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* Copyright 2014, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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// Package credentials implements various credentials supported by gRPC library,
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// which encapsulate all the state needed by a client to authenticate with a
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// server and make various assertions, e.g., about the client's identity, role,
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// or whether it is authorized to make a particular call.
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package credentials
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import (
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"crypto/tls"
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"crypto/x509"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"strings"
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"golang.org/x/net/context"
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)
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var (
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// alpnProtoStr are the specified application level protocols for gRPC.
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alpnProtoStr = []string{"h2"}
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)
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// PerRPCCredentials defines the common interface for the credentials which need to
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// attach security information to every RPC (e.g., oauth2).
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type PerRPCCredentials interface {
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// GetRequestMetadata gets the current request metadata, refreshing
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// tokens if required. This should be called by the transport layer on
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// each request, and the data should be populated in headers or other
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// context. uri is the URI of the entry point for the request. When
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// supported by the underlying implementation, ctx can be used for
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// timeout and cancellation.
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// TODO(zhaoq): Define the set of the qualified keys instead of leaving
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// it as an arbitrary string.
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GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error)
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// RequireTransportSecurity indicates whether the credentials requires
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// transport security.
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RequireTransportSecurity() bool
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}
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// ProtocolInfo provides information regarding the gRPC wire protocol version,
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// security protocol, security protocol version in use, server name, etc.
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type ProtocolInfo struct {
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// ProtocolVersion is the gRPC wire protocol version.
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ProtocolVersion string
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// SecurityProtocol is the security protocol in use.
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SecurityProtocol string
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// SecurityVersion is the security protocol version.
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SecurityVersion string
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// ServerName is the user-configured server name.
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ServerName string
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}
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// AuthInfo defines the common interface for the auth information the users are interested in.
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type AuthInfo interface {
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AuthType() string
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}
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var (
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// ErrConnDispatched indicates that rawConn has been dispatched out of gRPC
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// and the caller should not close rawConn.
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ErrConnDispatched = errors.New("credentials: rawConn is dispatched out of gRPC")
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)
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// TransportCredentials defines the common interface for all the live gRPC wire
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// protocols and supported transport security protocols (e.g., TLS, SSL).
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type TransportCredentials interface {
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// ClientHandshake does the authentication handshake specified by the corresponding
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// authentication protocol on rawConn for clients. It returns the authenticated
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// connection and the corresponding auth information about the connection.
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// Implementations must use the provided context to implement timely cancellation.
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ClientHandshake(context.Context, string, net.Conn) (net.Conn, AuthInfo, error)
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// ServerHandshake does the authentication handshake for servers. It returns
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// the authenticated connection and the corresponding auth information about
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// the connection.
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ServerHandshake(net.Conn) (net.Conn, AuthInfo, error)
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// Info provides the ProtocolInfo of this TransportCredentials.
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Info() ProtocolInfo
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// Clone makes a copy of this TransportCredentials.
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Clone() TransportCredentials
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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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// gRPC internals also use it to override the virtual hosting name if it is set.
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// It must be called before dialing. Currently, this is only used by grpclb.
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OverrideServerName(string) error
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}
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// TLSInfo contains the auth information for a TLS authenticated connection.
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// It implements the AuthInfo interface.
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type TLSInfo struct {
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State tls.ConnectionState
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}
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// AuthType returns the type of TLSInfo as a string.
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func (t TLSInfo) AuthType() string {
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return "tls"
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}
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// tlsCreds is the credentials required for authenticating a connection using TLS.
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type tlsCreds struct {
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// TLS configuration
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config *tls.Config
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}
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func (c tlsCreds) Info() ProtocolInfo {
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return ProtocolInfo{
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SecurityProtocol: "tls",
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SecurityVersion: "1.2",
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ServerName: c.config.ServerName,
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}
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}
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func (c *tlsCreds) ClientHandshake(ctx context.Context, addr string, rawConn net.Conn) (_ net.Conn, _ AuthInfo, err error) {
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// use local cfg to avoid clobbering ServerName if using multiple endpoints
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cfg := cloneTLSConfig(c.config)
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if cfg.ServerName == "" {
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colonPos := strings.LastIndex(addr, ":")
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if colonPos == -1 {
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colonPos = len(addr)
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}
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cfg.ServerName = addr[:colonPos]
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}
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conn := tls.Client(rawConn, cfg)
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errChannel := make(chan error, 1)
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go func() {
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errChannel <- conn.Handshake()
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}()
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select {
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case err := <-errChannel:
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if err != nil {
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return nil, nil, err
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}
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case <-ctx.Done():
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return nil, nil, ctx.Err()
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}
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return conn, TLSInfo{conn.ConnectionState()}, nil
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}
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func (c *tlsCreds) ServerHandshake(rawConn net.Conn) (net.Conn, AuthInfo, error) {
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conn := tls.Server(rawConn, c.config)
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if err := conn.Handshake(); err != nil {
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return nil, nil, err
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}
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return conn, TLSInfo{conn.ConnectionState()}, nil
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}
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func (c *tlsCreds) Clone() TransportCredentials {
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return NewTLS(c.config)
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}
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func (c *tlsCreds) OverrideServerName(serverNameOverride string) error {
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c.config.ServerName = serverNameOverride
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return nil
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}
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// NewTLS uses c to construct a TransportCredentials based on TLS.
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func NewTLS(c *tls.Config) TransportCredentials {
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tc := &tlsCreds{cloneTLSConfig(c)}
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tc.config.NextProtos = alpnProtoStr
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return tc
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}
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// NewClientTLSFromCert constructs a TLS from the input certificate for client.
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// serverNameOverride is for testing only. If set to a non empty string,
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// it will override the virtual host name of authority (e.g. :authority header field) in requests.
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func NewClientTLSFromCert(cp *x509.CertPool, serverNameOverride string) TransportCredentials {
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return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp})
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}
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// NewClientTLSFromFile constructs a TLS from the input certificate file for client.
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// serverNameOverride is for testing only. If set to a non empty string,
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// it will override the virtual host name of authority (e.g. :authority header field) in requests.
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func NewClientTLSFromFile(certFile, serverNameOverride string) (TransportCredentials, error) {
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b, err := ioutil.ReadFile(certFile)
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if err != nil {
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return nil, err
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}
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cp := x509.NewCertPool()
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if !cp.AppendCertsFromPEM(b) {
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return nil, fmt.Errorf("credentials: failed to append certificates")
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}
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return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp}), nil
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}
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// NewServerTLSFromCert constructs a TLS from the input certificate for server.
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func NewServerTLSFromCert(cert *tls.Certificate) TransportCredentials {
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return NewTLS(&tls.Config{Certificates: []tls.Certificate{*cert}})
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}
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// NewServerTLSFromFile constructs a TLS from the input certificate file and key
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// file for server.
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func NewServerTLSFromFile(certFile, keyFile string) (TransportCredentials, error) {
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cert, err := tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return nil, err
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}
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return NewTLS(&tls.Config{Certificates: []tls.Certificate{cert}}), nil
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}
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