-
Notifications
You must be signed in to change notification settings - Fork 113
/
password.go
83 lines (71 loc) · 2.68 KB
/
password.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
// Copyright 2018-2020 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package credentials
import (
"strings"
"github.com/pkg/errors"
"golang.org/x/crypto/bcrypt"
)
// Password holds a hash password alongside its salt value.
type Password struct {
Value string `json:"value"`
}
const (
passwordMinLength = 8
)
// Set sets a new password by hashing the plaintext version using bcrypt.
func (password *Password) Set(pwd string) error {
if err := VerifyPassword(pwd); err != nil {
return errors.Wrap(err, "invalid password")
}
pwdData, err := bcrypt.GenerateFromPassword([]byte(pwd), bcrypt.DefaultCost)
if err != nil {
return errors.Wrap(err, "unable to generate password hash")
}
password.Value = string(pwdData)
return nil
}
// Compare checks whether the given password string equals the stored one.
func (password *Password) Compare(pwd string) bool {
return bcrypt.CompareHashAndPassword([]byte(password.Value), []byte(pwd)) == nil
}
// IsValid checks whether the password is valid.
func (password *Password) IsValid() bool {
// bcrypt hashes are in the form of $[version]$[cost]$[22 character salt][31 character hash], so they have a minimum length of 58
return len(password.Value) > 58 && strings.Count(password.Value, "$") >= 3
}
// Clear resets the password.
func (password *Password) Clear() {
password.Value = ""
}
// VerifyPassword checks whether the given password abides to the enforced password strength.
func VerifyPassword(pwd string) error {
if len(pwd) < passwordMinLength {
return errors.Errorf("the password must be at least 8 characters long")
}
if !strings.ContainsAny(pwd, "abcdefghijklmnopqrstuvwxyz") {
return errors.Errorf("the password must contain at least one lowercase letter")
}
if !strings.ContainsAny(pwd, "ABCDEFGHIJKLMNOPQRSTUVWXYZ") {
return errors.Errorf("the password must contain at least one uppercase letter")
}
if !strings.ContainsAny(pwd, "0123456789") {
return errors.Errorf("the password must contain at least one digit")
}
return nil
}