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minio/cmd/credential.go

148 lines
4.3 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016, 2017 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"crypto/rand"
"encoding/base64"
"errors"
"golang.org/x/crypto/bcrypt"
)
const (
// Minimum length for Minio access key.
accessKeyMinLen = 5
// Maximum length for Minio access key.
// There is no max length enforcement for access keys
accessKeyMaxLen = 20
// Minimum length for Minio secret key for both server and gateway mode.
secretKeyMinLen = 8
// Maximum secret key length for Minio, this
// is used when autogenerating new credentials.
// There is no max length enforcement for secret keys
secretKeyMaxLen = 40
// Alpha numeric table used for generating access keys.
alphaNumericTable = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// Total length of the alpha numeric table.
alphaNumericTableLen = byte(len(alphaNumericTable))
)
// Common errors generated for access and secret key validation.
var (
errInvalidAccessKeyLength = errors.New("Invalid access key, access key should be minimum 5 characters in length")
errInvalidSecretKeyLength = errors.New("Invalid secret key, secret key should be minimum 8 characters in length")
)
// isAccessKeyValid - validate access key for right length.
func isAccessKeyValid(accessKey string) bool {
return len(accessKey) >= accessKeyMinLen
}
// isSecretKeyValid - validate secret key for right length.
func isSecretKeyValid(secretKey string) bool {
return len(secretKey) >= secretKeyMinLen
}
// credential container for access and secret keys.
type credential struct {
AccessKey string `json:"accessKey,omitempty"`
SecretKey string `json:"secretKey,omitempty"`
secretKeyHash []byte
}
// IsValid - returns whether credential is valid or not.
func (cred credential) IsValid() bool {
return isAccessKeyValid(cred.AccessKey) && isSecretKeyValid(cred.SecretKey)
}
// Equals - returns whether two credentials are equal or not.
func (cred credential) Equal(ccred credential) bool {
if !ccred.IsValid() {
return false
}
if cred.secretKeyHash == nil {
secretKeyHash, err := bcrypt.GenerateFromPassword([]byte(cred.SecretKey), bcrypt.DefaultCost)
if err != nil {
errorIf(err, "Unable to generate hash of given password")
return false
}
cred.secretKeyHash = secretKeyHash
}
return (cred.AccessKey == ccred.AccessKey &&
bcrypt.CompareHashAndPassword(cred.secretKeyHash, []byte(ccred.SecretKey)) == nil)
}
func createCredential(accessKey, secretKey string) (cred credential, err error) {
if !isAccessKeyValid(accessKey) {
err = errInvalidAccessKeyLength
} else if !isSecretKeyValid(secretKey) {
err = errInvalidSecretKeyLength
} else {
var secretKeyHash []byte
secretKeyHash, err = bcrypt.GenerateFromPassword([]byte(secretKey), bcrypt.DefaultCost)
if err == nil {
cred.AccessKey = accessKey
cred.SecretKey = secretKey
cred.secretKeyHash = secretKeyHash
}
}
return cred, err
}
// Initialize a new credential object
func getNewCredential(accessKeyLen, secretKeyLen int) (cred credential, err error) {
// Generate access key.
keyBytes := make([]byte, accessKeyLen)
_, err = rand.Read(keyBytes)
if err != nil {
return cred, err
}
for i := 0; i < accessKeyLen; i++ {
keyBytes[i] = alphaNumericTable[keyBytes[i]%alphaNumericTableLen]
}
accessKey := string(keyBytes)
// Generate secret key.
keyBytes = make([]byte, secretKeyLen)
_, err = rand.Read(keyBytes)
if err != nil {
return cred, err
}
secretKey := string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyLen])
cred, err = createCredential(accessKey, secretKey)
return cred, err
}
func mustGetNewCredential() credential {
// Generate Minio credentials with Minio key max lengths.
cred, err := getNewCredential(accessKeyMaxLen, secretKeyMaxLen)
fatalIf(err, "Unable to generate new credentials.")
return cred
}