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106 lines
3.0 KiB
106 lines
3.0 KiB
/*
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* Minio Cloud Storage, (C) 2015, 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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"crypto/rand"
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"encoding/base64"
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"golang.org/x/crypto/bcrypt"
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)
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const (
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accessKeyMinLen = 5
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accessKeyMaxLen = 20
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secretKeyMinLen = 8
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secretKeyMaxLen = 40
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alphaNumericTable = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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alphaNumericTableLen = byte(len(alphaNumericTable))
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)
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func mustGetAccessKey() string {
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keyBytes := make([]byte, accessKeyMaxLen)
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if _, err := rand.Read(keyBytes); err != nil {
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panic(err)
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}
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for i := 0; i < accessKeyMaxLen; i++ {
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keyBytes[i] = alphaNumericTable[keyBytes[i]%alphaNumericTableLen]
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}
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return string(keyBytes)
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}
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func mustGetSecretKey() string {
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keyBytes := make([]byte, secretKeyMaxLen)
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if _, err := rand.Read(keyBytes); err != nil {
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panic(err)
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}
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return string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyMaxLen])
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}
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// isAccessKeyValid - validate access key for right length.
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func isAccessKeyValid(accessKey string) bool {
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return len(accessKey) >= accessKeyMinLen && len(accessKey) <= accessKeyMaxLen
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}
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// isSecretKeyValid - validate secret key for right length.
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func isSecretKeyValid(secretKey string) bool {
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return len(secretKey) >= secretKeyMinLen && len(secretKey) <= secretKeyMaxLen
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}
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// credential container for access and secret keys.
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type credential struct {
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AccessKey string `json:"accessKey,omitempty"`
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SecretKey string `json:"secretKey,omitempty"`
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SecretKeyHash []byte `json:"secretKeyHash,omitempty"`
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}
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// Generate a bcrypt hashed key for input secret key.
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func mustGetHashedSecretKey(secretKey string) []byte {
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hashedSecretKey, err := bcrypt.GenerateFromPassword([]byte(secretKey), bcrypt.DefaultCost)
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if err != nil {
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panic(err)
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}
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return hashedSecretKey
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}
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// Initialize a new credential object.
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func newCredential() credential {
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secretKey := mustGetSecretKey()
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accessKey := mustGetAccessKey()
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secretHash := mustGetHashedSecretKey(secretKey)
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return credential{accessKey, secretKey, secretHash}
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}
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// Converts accessKey and secretKeys into credential object which
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// contains bcrypt secret key hash for future validation.
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func getCredential(accessKey, secretKey string) (credential, error) {
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if !isAccessKeyValid(accessKey) {
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return credential{}, errInvalidAccessKeyLength
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}
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if !isSecretKeyValid(secretKey) {
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return credential{}, errInvalidSecretKeyLength
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}
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secretHash := mustGetHashedSecretKey(secretKey)
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return credential{accessKey, secretKey, secretHash}, nil
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}
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