92 lines
3.1 KiB
Go
92 lines
3.1 KiB
Go
/*
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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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"net/rpc"
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"time"
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"github.com/minio/dsync"
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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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rpc *RPCClient // reconnect'able rpc client built on top of net/rpc Client
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cred credential // AccessKey and SecretKey
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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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tstamp time.Time // Timestamp as received on Login RPC.
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loginMethod string // RPC service name for authenticating using JWT
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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(node, rpcPath string, cred credential, loginMethod string) *AuthRPCClient {
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return &AuthRPCClient{
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rpc: newClient(node, rpcPath),
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cred: cred,
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isLoggedIn: false, // Not logged in yet.
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loginMethod: loginMethod,
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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.loginMethod, RPCLoginArgs{
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Username: authClient.cred.AccessKeyID,
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Password: authClient.cred.SecretAccessKey,
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}, &reply); err != nil {
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return err
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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.tstamp = reply.Timestamp
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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 dsync.TokenSetter, 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(authClient.tstamp)
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// ..
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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 && err == rpc.ErrShutdown {
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authClient.isLoggedIn = false
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}
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}
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return err
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}
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