2016-08-22 20:01:21 +02:00
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/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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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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package cmd
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import (
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2016-08-24 19:14:14 +02:00
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"fmt"
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2016-08-24 01:26:42 +02:00
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"net/rpc"
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2016-08-22 20:01:21 +02:00
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"time"
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2016-08-24 19:14:14 +02:00
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jwtgo "github.com/dgrijalva/jwt-go"
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2016-08-22 20:01:21 +02:00
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)
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2016-08-24 19:14:14 +02:00
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// GenericReply represents any generic RPC reply.
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type GenericReply struct{}
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// GenericArgs represents any generic RPC arguments.
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type GenericArgs struct {
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Token string // Used to authenticate every RPC call.
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// Used to verify if the RPC call was issued between
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// the same Login() and disconnect event pair.
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Timestamp time.Time
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// Indicates if args should be sent to remote peers as well.
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Remote bool
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}
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// SetToken - sets the token to the supplied value.
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func (ga *GenericArgs) SetToken(token string) {
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ga.Token = token
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}
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// SetTimestamp - sets the timestamp to the supplied value.
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func (ga *GenericArgs) SetTimestamp(tstamp time.Time) {
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ga.Timestamp = tstamp
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}
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// RPCLoginArgs - login username and password for RPC.
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type RPCLoginArgs struct {
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Username string
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Password string
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}
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// RPCLoginReply - login reply provides generated token to be used
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// with subsequent requests.
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type RPCLoginReply struct {
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Token string
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Timestamp time.Time
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ServerVersion string
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}
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// Validates if incoming token is valid.
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func isRPCTokenValid(tokenStr string) bool {
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2016-10-05 19:18:55 +02:00
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jwt, err := newJWT(defaultInterNodeJWTExpiry)
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if err != nil {
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errorIf(err, "Unable to initialize JWT")
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return false
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}
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token, err := jwtgo.Parse(tokenStr, func(token *jwtgo.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwtgo.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
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}
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return []byte(jwt.SecretAccessKey), nil
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})
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if err != nil {
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errorIf(err, "Unable to parse JWT token string")
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return false
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}
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// Return if token is valid.
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return token.Valid
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}
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// Auth config represents authentication credentials and Login method name to be used
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// for fetching JWT tokens from the RPC server.
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type authConfig struct {
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accessKey string // Username for the server.
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secretKey string // Password for the server.
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secureConn bool // Ask for a secured connection
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address string // Network address path of RPC server.
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path string // Network path for HTTP dial.
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loginMethod string // RPC service name for authenticating using JWT
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}
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// AuthRPCClient is a wrapper type for RPCClient which provides JWT based authentication across reconnects.
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type AuthRPCClient struct {
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config *authConfig
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rpc *RPCClient // reconnect'able rpc client built on top of net/rpc Client
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isLoggedIn bool // Indicates if the auth client has been logged in and token is valid.
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token string // JWT based token
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serverVersion string // Server version exchanged by the RPC.
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}
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// newAuthClient - returns a jwt based authenticated (go) rpc client, which does automatic reconnect.
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func newAuthClient(cfg *authConfig) *AuthRPCClient {
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return &AuthRPCClient{
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// Save the config.
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config: cfg,
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// Initialize a new reconnectable rpc client.
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rpc: newClient(cfg.address, cfg.path, cfg.secureConn),
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// Allocated auth client not logged in yet.
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isLoggedIn: false,
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}
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}
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// Close - closes underlying rpc connection.
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func (authClient *AuthRPCClient) Close() error {
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// reset token on closing a connection
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authClient.isLoggedIn = false
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return authClient.rpc.Close()
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}
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// Login - a jwt based authentication is performed with rpc server.
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func (authClient *AuthRPCClient) Login() error {
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// Return if already logged in.
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if authClient.isLoggedIn {
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return nil
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}
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reply := RPCLoginReply{}
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if err := authClient.rpc.Call(authClient.config.loginMethod, RPCLoginArgs{
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Username: authClient.config.accessKey,
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Password: authClient.config.secretKey,
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}, &reply); err != nil {
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return err
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}
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// Validate if version do indeed match.
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if reply.ServerVersion != Version {
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return errServerVersionMismatch
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}
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2016-10-07 20:15:55 +02:00
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curTime := time.Now().UTC()
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if curTime.Sub(reply.Timestamp) > globalMaxSkewTime {
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return errServerTimeMismatch
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}
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// Set token, time stamp as received from a successful login call.
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authClient.token = reply.Token
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authClient.serverVersion = reply.ServerVersion
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authClient.isLoggedIn = true
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return nil
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}
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// Call - If rpc connection isn't established yet since previous disconnect,
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// connection is established, a jwt authenticated login is performed and then
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// the call is performed.
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func (authClient *AuthRPCClient) Call(serviceMethod string, args interface {
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SetToken(token string)
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SetTimestamp(tstamp time.Time)
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}, reply interface{}) (err error) {
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// On successful login, attempt the call.
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if err = authClient.Login(); err == nil {
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// Set token and timestamp before the rpc call.
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args.SetToken(authClient.token)
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args.SetTimestamp(time.Now().UTC())
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// Call the underlying rpc.
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err = authClient.rpc.Call(serviceMethod, args, reply)
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// Invalidate token to mark for re-login on subsequent reconnect.
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if err != nil {
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if err.Error() == rpc.ErrShutdown.Error() {
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authClient.isLoggedIn = false
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}
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}
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}
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return err
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}
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// Node returns the node (network address) of the connection
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func (authClient *AuthRPCClient) Node() string {
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if authClient.rpc != nil {
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return authClient.rpc.node
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}
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return ""
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}
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// RPCPath returns the RPC path of the connection
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func (authClient *AuthRPCClient) RPCPath() string {
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if authClient.rpc != nil {
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return authClient.rpc.rpcPath
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}
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return ""
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}
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