Mercurial > go > multipass

annotate auth/auth.go @ 0:c18bc7b9d1d9

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Basic binaries. checkpassword doesn't yet work.
author Paul Fisher <paul@pfish.zone>
date Sat, 24 Oct 2015 21:32:03 -0400
parents
children 1c194fa9bbf4
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0
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1 // Package auth contains data structures for authenticating users.
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2
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3 package auth
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4
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5 import (
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6 "crypto/rand"
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7 "encoding/base64"
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8 "errors"
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9 "math/big"
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10 "strconv"
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11 "strings"
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12
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13 "golang.org/x/crypto/bcrypt"
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14 )
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15
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16 const (
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17 // default cost stolen from python bcrypt
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18 bcryptCost = 12
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19 // we only generate passwords from lowercases for non-ambiguity
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20 lowercases = "abcdefghijklmnopqrstuvwxyz"
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21 template = "____-____-____-____"
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22 )
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23
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24 var (
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25 lowercaseLen *big.Int = big.NewInt(int64(len(lowercases)))
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26 maxID = big.NewInt(0)
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27 )
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28
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29 var (
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30 ShortEntryError error = errors.New("multipass/auth: password entry must have 3 or more fields")
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31 BadIDError = errors.New("multipass/auth: ID field invalid")
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32 Base64Error = errors.New("multipass/auth: can't decode base64 data")
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33 LongDescriptionError = errors.New("multipass/auth: description must be less than 255 bytes")
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34 )
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35
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36 func init() {
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37 one := big.NewInt(1)
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38 maxID.Lsh(one, 64)
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39 }
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40
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41 // Entry represents a single entry in the a multipass file.
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42 type Entry struct {
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43 id uint64
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44 hash string
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45 description string
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46 rest []string
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47 }
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48
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49 // EntryFromShadow creates a new entry from a line in a multipass shadow file.
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50 // The line should not end in a newline.
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51 func EntryFromShadow(shadow string) (*Entry, error) {
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52 segments := strings.Split(shadow, ":")
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53 if len(segments) < 2 {
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54 return nil, ShortEntryError
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55 }
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56 entry := new(Entry)
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57 id, err := strconv.ParseUint(segments[0], 10, 64)
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58 if err != nil {
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59 return nil, BadIDError
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60 }
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61 entry.id = id
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62 entry.hash = segments[1]
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63 if len(segments) > 2 {
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64 description, err := base64.StdEncoding.DecodeString(segments[2])
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65 if err != nil {
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66 return nil, Base64Error
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67 }
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68 entry.description = string(description)
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69 entry.rest = segments[3:]
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70 }
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71 return entry, nil
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72 }
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73
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74 // NewEntry creates an Entry for the given description.
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75 // It returns the Entry itself and a generated password.
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76 func NewEntry(description string) (entry *Entry, password string, err error) {
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77 if len(description) > 255 {
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78 return nil, "", LongDescriptionError
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79 }
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80 passBytes := genPassword()
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81 password = string(passBytes)
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82 hashBytes, err := bcrypt.GenerateFromPassword(passBytes, bcryptCost)
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83 if err != nil {
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84 // This is very unexpected.
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85 return nil, "", err
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86 }
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87 e := new(Entry)
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88 e.id = newID()
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89 e.hash = string(hashBytes)
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90 e.description = description
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91 return e, password, nil
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92 }
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93
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94 // ID is a unique 64-bit integer which identifies the entry.
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95 func (e *Entry) ID() uint64 {
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96 return e.id
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97 }
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98
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99 // Description is the user's description of their password.
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100 func (e *Entry) Description() string {
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101 return e.description
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102 }
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103
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104 // Authenticate tests whether the password is correct.
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105 func (e *Entry) Authenticate(password string) bool {
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106 err := bcrypt.CompareHashAndPassword([]byte(e.hash), []byte(password))
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107 return err == nil
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108 }
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109
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110 // Encode encodes this Entry to a bytestring for writing to a multipass shadow file.
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111 func (e *Entry) Encode() string {
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112 segments := []string{
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113 strconv.FormatUint(e.id, 10),
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114 e.hash,
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115 base64.StdEncoding.EncodeToString([]byte(e.description)),
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116 }
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117 segments = append(segments, e.rest...)
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118 return strings.Join(segments, ":")
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119 }
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120
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121 func genPassword() []byte {
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122 password := []byte(template)
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123 for group := 0; group < 4; group++ {
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124 base := group * 5
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125 for chr := 0; chr < 4; chr++ {
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126 password[base+chr] = randChr()
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127 }
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128 }
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129 return password
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130 }
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131
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132 func randChr() byte {
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133 bigIdx, err := rand.Int(rand.Reader, lowercaseLen)
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134 if err != nil {
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135 panic("multipass/auth: can't get a random number")
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136 }
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137 idx := bigIdx.Int64()
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138 return byte(lowercases[idx])
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139 }
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140
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141 func newID() uint64 {
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142 bigID, err := rand.Int(rand.Reader, maxID)
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143 if err != nil {
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144 panic("multipass/auth: can't get a random number")
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145 }
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146 return bigID.Uint64()
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147 }