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Copy pathcredentials.go
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258 lines (223 loc) · 7.47 KB
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/*
* MinIO Cloud Storage, (C) 2015, 2016, 2017, 2018 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 auth
import (
"crypto/rand"
"crypto/subtle"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"strconv"
"strings"
"time"
jwtgo "github.com/dgrijalva/jwt-go"
)
const (
// Minimum length for MinIO access key.
accessKeyMinLen = 3
// 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 = fmt.Errorf("access key must be minimum %v or more characters long", accessKeyMinLen)
ErrInvalidSecretKeyLength = fmt.Errorf("secret key must be minimum %v or more characters long", secretKeyMinLen)
)
// 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
}
// Default access and secret keys.
const (
DefaultAccessKey = "minioadmin"
DefaultSecretKey = "minioadmin"
)
// Default access credentials
var (
DefaultCredentials = Credentials{
AccessKey: DefaultAccessKey,
SecretKey: DefaultSecretKey,
}
)
// Credentials holds access and secret keys.
type Credentials struct {
AccessKey string `xml:"AccessKeyId" json:"accessKey,omitempty"`
SecretKey string `xml:"SecretAccessKey" json:"secretKey,omitempty"`
Expiration time.Time `xml:"Expiration" json:"expiration,omitempty"`
SessionToken string `xml:"SessionToken" json:"sessionToken,omitempty"`
Status string `xml:"-" json:"status,omitempty"`
ParentUser string `xml:"-" json:"parentUser,omitempty"`
Groups []string `xml:"-" json:"groups,omitempty"`
}
func (cred Credentials) String() string {
var s strings.Builder
s.WriteString(cred.AccessKey)
s.WriteString(":")
s.WriteString(cred.SecretKey)
if cred.SessionToken != "" {
s.WriteString("\n")
s.WriteString(cred.SessionToken)
}
if !cred.Expiration.IsZero() && !cred.Expiration.Equal(timeSentinel) {
s.WriteString("\n")
s.WriteString(cred.Expiration.String())
}
return s.String()
}
// IsExpired - returns whether Credential is expired or not.
func (cred Credentials) IsExpired() bool {
if cred.Expiration.IsZero() || cred.Expiration.Equal(timeSentinel) {
return false
}
return cred.Expiration.Before(time.Now().UTC())
}
// IsTemp - returns whether credential is temporary or not.
func (cred Credentials) IsTemp() bool {
return cred.SessionToken != "" && !cred.Expiration.IsZero() && !cred.Expiration.Equal(timeSentinel)
}
// IsServiceAccount - returns whether credential is a service account or not
func (cred Credentials) IsServiceAccount() bool {
return cred.ParentUser != "" && (cred.Expiration.IsZero() || cred.Expiration.Equal(timeSentinel))
}
// IsValid - returns whether credential is valid or not.
func (cred Credentials) IsValid() bool {
// Verify credentials if its enabled or not set.
if cred.Status == "off" {
return false
}
return IsAccessKeyValid(cred.AccessKey) && IsSecretKeyValid(cred.SecretKey) && !cred.IsExpired()
}
// Equal - returns whether two credentials are equal or not.
func (cred Credentials) Equal(ccred Credentials) bool {
if !ccred.IsValid() {
return false
}
return (cred.AccessKey == ccred.AccessKey && subtle.ConstantTimeCompare([]byte(cred.SecretKey), []byte(ccred.SecretKey)) == 1 &&
subtle.ConstantTimeCompare([]byte(cred.SessionToken), []byte(ccred.SessionToken)) == 1)
}
var timeSentinel = time.Unix(0, 0).UTC()
// ErrInvalidDuration invalid token expiry
var ErrInvalidDuration = errors.New("invalid token expiry")
// ExpToInt64 - convert input interface value to int64.
func ExpToInt64(expI interface{}) (expAt int64, err error) {
switch exp := expI.(type) {
case string:
expAt, err = strconv.ParseInt(exp, 10, 64)
case float64:
expAt, err = int64(exp), nil
case int64:
expAt, err = exp, nil
case int:
expAt, err = int64(exp), nil
case uint64:
expAt, err = int64(exp), nil
case uint:
expAt, err = int64(exp), nil
case json.Number:
expAt, err = exp.Int64()
case time.Duration:
expAt, err = time.Now().UTC().Add(exp).Unix(), nil
case nil:
expAt, err = 0, nil
default:
expAt, err = 0, ErrInvalidDuration
}
if expAt < 0 {
return 0, ErrInvalidDuration
}
return expAt, err
}
// GetNewCredentialsWithMetadata generates and returns new credential with expiry.
func GetNewCredentialsWithMetadata(m map[string]interface{}, tokenSecret string) (cred Credentials, err error) {
readBytes := func(size int) (data []byte, err error) {
data = make([]byte, size)
var n int
if n, err = rand.Read(data); err != nil {
return nil, err
} else if n != size {
return nil, fmt.Errorf("Not enough data. Expected to read: %v bytes, got: %v bytes", size, n)
}
return data, nil
}
// Generate access key.
keyBytes, err := readBytes(accessKeyMaxLen)
if err != nil {
return cred, err
}
for i := 0; i < accessKeyMaxLen; i++ {
keyBytes[i] = alphaNumericTable[keyBytes[i]%alphaNumericTableLen]
}
cred.AccessKey = string(keyBytes)
// Generate secret key.
keyBytes, err = readBytes(secretKeyMaxLen)
if err != nil {
return cred, err
}
cred.SecretKey = strings.Replace(string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyMaxLen]),
"/", "+", -1)
cred.Status = "on"
if tokenSecret == "" {
cred.Expiration = timeSentinel
return cred, nil
}
expiry, err := ExpToInt64(m["exp"])
if err != nil {
return cred, err
}
m["accessKey"] = cred.AccessKey
jwt := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, jwtgo.MapClaims(m))
cred.Expiration = time.Unix(expiry, 0).UTC()
cred.SessionToken, err = jwt.SignedString([]byte(tokenSecret))
if err != nil {
return cred, err
}
return cred, nil
}
// GetNewCredentials generates and returns new credential.
func GetNewCredentials() (cred Credentials, err error) {
return GetNewCredentialsWithMetadata(map[string]interface{}{}, "")
}
// CreateCredentials returns new credential with the given access key and secret key.
// Error is returned if given access key or secret key are invalid length.
func CreateCredentials(accessKey, secretKey string) (cred Credentials, err error) {
if !IsAccessKeyValid(accessKey) {
return cred, ErrInvalidAccessKeyLength
}
if !IsSecretKeyValid(secretKey) {
return cred, ErrInvalidSecretKeyLength
}
cred.AccessKey = accessKey
cred.SecretKey = secretKey
cred.Expiration = timeSentinel
cred.Status = "on"
return cred, nil
}