mirror of https://github.com/minio/minio.git
124 lines
3.7 KiB
Go
124 lines
3.7 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015, 2016, 2017 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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"errors"
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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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secretKeyMaxLenAmazon = 40
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alphaNumericTable = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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alphaNumericTableLen = byte(len(alphaNumericTable))
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)
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var (
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errInvalidAccessKeyLength = errors.New("Invalid access key, access key should be 5 to 20 characters in length")
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errInvalidSecretKeyLength = errors.New("Invalid secret key, secret key should be 8 to 40 characters in length")
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)
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var secretKeyMaxLen = secretKeyMaxLenAmazon
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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
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}
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// IsValid - returns whether credential is valid or not.
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func (cred credential) IsValid() bool {
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return isAccessKeyValid(cred.AccessKey) && isSecretKeyValid(cred.SecretKey)
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}
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// Equals - returns whether two credentials are equal or not.
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func (cred credential) Equal(ccred credential) bool {
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if !ccred.IsValid() {
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return false
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}
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if cred.secretKeyHash == nil {
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secretKeyHash, err := bcrypt.GenerateFromPassword([]byte(cred.SecretKey), bcrypt.DefaultCost)
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if err != nil {
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errorIf(err, "Unable to generate hash of given password")
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return false
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}
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cred.secretKeyHash = secretKeyHash
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}
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return (cred.AccessKey == ccred.AccessKey &&
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bcrypt.CompareHashAndPassword(cred.secretKeyHash, []byte(ccred.SecretKey)) == nil)
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}
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func createCredential(accessKey, secretKey string) (cred credential, err error) {
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if !isAccessKeyValid(accessKey) {
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err = errInvalidAccessKeyLength
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} else if !isSecretKeyValid(secretKey) {
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err = errInvalidSecretKeyLength
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} else {
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var secretKeyHash []byte
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secretKeyHash, err = bcrypt.GenerateFromPassword([]byte(secretKey), bcrypt.DefaultCost)
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if err == nil {
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cred.AccessKey = accessKey
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cred.SecretKey = secretKey
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cred.secretKeyHash = secretKeyHash
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}
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}
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return cred, err
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}
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// Initialize a new credential object
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func mustGetNewCredential() credential {
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// Generate access key.
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keyBytes := make([]byte, accessKeyMaxLen)
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_, err := rand.Read(keyBytes)
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fatalIf(err, "Unable to generate access key.")
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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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accessKey := string(keyBytes)
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// Generate secret key.
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keyBytes = make([]byte, secretKeyMaxLen)
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_, err = rand.Read(keyBytes)
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fatalIf(err, "Unable to generate secret key.")
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secretKey := string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyMaxLen])
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cred, err := createCredential(accessKey, secretKey)
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fatalIf(err, "Unable to generate new credential.")
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return cred
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}
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