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111 lines
3.1 KiB
111 lines
3.1 KiB
/*
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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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"time"
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"github.com/minio/dsync"
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)
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// Allow any RPC call request time should be no more/less than 3 seconds.
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// 3 seconds is chosen arbitrarily.
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const rpcSkewTimeAllowed = 3 * time.Second
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func isRequestTimeAllowed(requestTime time.Time) bool {
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// Check whether request time is within acceptable skew time.
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utcNow := time.Now().UTC()
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return !(requestTime.Sub(utcNow) > rpcSkewTimeAllowed ||
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utcNow.Sub(requestTime) > rpcSkewTimeAllowed)
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}
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// AuthRPCArgs represents minimum required arguments to make any authenticated RPC call.
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type AuthRPCArgs struct {
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// Authentication token to be verified by the server for every RPC call.
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AuthToken string
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// Request time to be verified by the server for every RPC call.
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// This is an addition check over Authentication token for time drifting.
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RequestTime time.Time
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}
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// SetAuthToken - sets the token to the supplied value.
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func (args *AuthRPCArgs) SetAuthToken(authToken string) {
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args.AuthToken = authToken
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}
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// SetRequestTime - sets the requestTime to the supplied value.
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func (args *AuthRPCArgs) SetRequestTime(requestTime time.Time) {
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args.RequestTime = requestTime
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}
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// IsAuthenticated - validated whether this auth RPC args are already authenticated or not.
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func (args AuthRPCArgs) IsAuthenticated() error {
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// Check whether the token is valid
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if !isAuthTokenValid(args.AuthToken) {
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return errInvalidToken
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}
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// Check if the request time is within the allowed skew limit.
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if !isRequestTimeAllowed(args.RequestTime) {
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return errServerTimeMismatch
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}
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// Good to go.
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return nil
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}
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// AuthRPCReply represents minimum required reply for any authenticated RPC call.
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type AuthRPCReply struct{}
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// LoginRPCArgs - login username and password for RPC.
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type LoginRPCArgs struct {
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Username string
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Password string
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Version string
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RequestTime time.Time
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}
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// IsValid - validates whether this LoginRPCArgs are valid for authentication.
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func (args LoginRPCArgs) IsValid() error {
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// Check if version matches.
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if args.Version != Version {
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return errServerVersionMismatch
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}
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if !isRequestTimeAllowed(args.RequestTime) {
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return errServerTimeMismatch
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}
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return nil
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}
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// LoginRPCReply - login reply provides generated token to be used
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// with subsequent requests.
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type LoginRPCReply struct {
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AuthToken string
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}
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// LockArgs represents arguments for any authenticated lock RPC call.
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type LockArgs struct {
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AuthRPCArgs
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LockArgs dsync.LockArgs
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}
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func newLockArgs(args dsync.LockArgs) LockArgs {
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return LockArgs{LockArgs: args}
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}
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