Mercurial > go > multipass

annotate file/auth.go @ 20:ef2ef22ca4b1 default tip

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Add pfish.zone/go/multipass/file import directive to 'file' package.
author Paul Fisher <paul@pfish.zone>
date Sun, 01 Nov 2015 13:00:54 -0500
parents 00d30c67b56d
children
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18
00d30c67b56d Put all the library stuff into multipass/file.
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1 package file
0
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2
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3 import (
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4 "crypto/rand"
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5 "encoding/base64"
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6 "errors"
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7 "math/big"
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8 "strconv"
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9 "strings"
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10
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11 "golang.org/x/crypto/bcrypt"
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12 )
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13
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14 const (
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15 // default cost stolen from python bcrypt
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16 bcryptCost = 12
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17 // we only generate passwords from lowercases for non-ambiguity
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18 lowercases = "abcdefghijklmnopqrstuvwxyz"
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19 template = "????-????-????-????"
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20 )
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21
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22 var (
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23 lowercaseLen *big.Int = big.NewInt(int64(len(lowercases)))
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24 maxID = big.NewInt(0)
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25 )
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26
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27 var (
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28 WrongLengthError error = errors.New("multipass/auth: password entry must have 3 fields")
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29 BadIDError = errors.New("multipass/auth: ID field invalid")
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30 Base64Error = errors.New("multipass/auth: can't decode base64 data")
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31 LongDescriptionError = errors.New("multipass/auth: description must be less than 255 bytes")
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32 )
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33
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34 func init() {
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35 one := big.NewInt(1)
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36 maxID.Lsh(one, 64)
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37 }
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38
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39 // Entry represents a single entry in the a multipass file.
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40 type Entry struct {
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41 id uint64
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42 hash string
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43 description string
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44 }
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45
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46 // EntryFromShadow creates a new entry from a line in a multipass shadow file.
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47 // The line should not end in a newline.
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48 func EntryFromShadow(shadow string) (*Entry, error) {
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49 segments := strings.Split(shadow, ":")
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50 if len(segments) != 3 {
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51 return nil, WrongLengthError
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52 }
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53 entry := new(Entry)
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54 id, err := strconv.ParseUint(segments[0], 10, 64)
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55 if err != nil {
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56 return nil, BadIDError
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57 }
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58 entry.id = id
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59 entry.hash = segments[1]
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60 description, err := base64.StdEncoding.DecodeString(segments[2])
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61 if err != nil {
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62 return nil, Base64Error
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63 }
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64 entry.description = string(description)
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65 return entry, nil
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66 }
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67
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68 // NewEntry creates an Entry for the given description.
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69 // It returns the Entry itself and a generated password.
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70 func NewEntry(description string) (entry *Entry, password string, err error) {
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71 if len(description) > 255 {
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72 return nil, "", LongDescriptionError
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73 }
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74 passBytes := genPassword()
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75 password = string(passBytes)
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76 hashBytes, err := bcrypt.GenerateFromPassword(passBytes, bcryptCost)
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77 if err != nil {
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78 // This is very unexpected.
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79 return nil, "", err
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80 }
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81 e := new(Entry)
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82 e.id = newID()
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83 e.hash = string(hashBytes)
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84 e.description = description
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85 return e, password, nil
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86 }
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87
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88 // ID is a unique 64-bit integer which identifies the entry.
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89 func (e *Entry) ID() uint64 {
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90 return e.id
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91 }
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92
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93 // Description is the user's description of their password.
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94 func (e *Entry) Description() string {
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95 return e.description
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96 }
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97
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98 // Authenticate tests whether the password is correct.
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99 func (e *Entry) Authenticate(password string) bool {
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100 err := bcrypt.CompareHashAndPassword([]byte(e.hash), []byte(password))
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101 return err == nil
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102 }
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103
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104 // Encode encodes this Entry to a bytestring for writing to a multipass shadow file.
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105 func (e *Entry) Encode() string {
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106 segments := []string{
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107 strconv.FormatUint(e.id, 10),
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108 e.hash,
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109 base64.StdEncoding.EncodeToString([]byte(e.description)),
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110 }
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111 return strings.Join(segments, ":")
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112 }
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113
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114 func genPassword() []byte {
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115 password := []byte(template)
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116 for i, chr := range password {
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117 if chr == '?' {
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118 password[i] = randChr()
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119 }
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120 }
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121 return password
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122 }
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123
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124 func randChr() byte {
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125 bigIdx, err := rand.Int(rand.Reader, lowercaseLen)
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126 if err != nil {
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127 panic("multipass/auth: can't get a random number")
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128 }
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129 idx := bigIdx.Int64()
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130 return byte(lowercases[idx])
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131 }
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132
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133 func newID() uint64 {
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134 bigID, err := rand.Int(rand.Reader, maxID)
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135 if err != nil {
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136 panic("multipass/auth: can't get a random number")
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137 }
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138 return bigID.Uint64()
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139 }