mirror of https://github.com/minio/minio.git
129 lines
3.9 KiB
Go
129 lines
3.9 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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"crypto/subtle"
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"encoding/base64"
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"errors"
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)
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const (
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// Minimum length for Minio access key.
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accessKeyMinLen = 5
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// Maximum length for Minio access key.
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// There is no max length enforcement for access keys
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accessKeyMaxLen = 20
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// Minimum length for Minio secret key for both server and gateway mode.
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secretKeyMinLen = 8
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// Maximum secret key length for Minio, this
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// is used when autogenerating new credentials.
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// There is no max length enforcement for secret keys
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secretKeyMaxLen = 40
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// Alpha numeric table used for generating access keys.
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alphaNumericTable = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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// Total length of the alpha numeric table.
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alphaNumericTableLen = byte(len(alphaNumericTable))
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)
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// Common errors generated for access and secret key validation.
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var (
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errInvalidAccessKeyLength = errors.New("Invalid access key, access key should be minimum 5 characters in length")
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errInvalidSecretKeyLength = errors.New("Invalid secret key, secret key should be minimum 8 characters in length")
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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
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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
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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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}
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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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return cred.AccessKey == ccred.AccessKey && subtle.ConstantTimeCompare([]byte(cred.SecretKey), []byte(ccred.SecretKey)) == 1
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}
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// createCredential returns new credentials from the given access key and secret key.
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// It returns an error if the access key or secret key are too long or short.
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func createCredential(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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return credential{
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AccessKey: accessKey,
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SecretKey: secretKey,
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}, nil
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}
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// Initialize a new credential object
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func getNewCredential(accessKeyLen, secretKeyLen int) (cred credential, err error) {
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keyBytes := make([]byte, accessKeyLen)
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_, err = rand.Read(keyBytes)
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if err != nil {
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return cred, err
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}
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for i := 0; i < accessKeyLen; 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, secretKeyLen)
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_, err = rand.Read(keyBytes)
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if err != nil {
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return cred, err
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}
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secretKey := string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyLen])
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cred, err = createCredential(accessKey, secretKey)
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return cred, err
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}
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func mustGetNewCredential() credential {
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// Generate Minio credentials with Minio key max lengths.
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cred, err := getNewCredential(accessKeyMaxLen, secretKeyMaxLen)
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fatalIf(err, "Unable to generate new credentials.")
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return cred
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}
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