Mercurial > gemma

annotate pkg/auth/session.go @ 1322:176c42053562

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Use more keyed initializers to make 'go vet' happier.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 24 Nov 2018 16:55:40 +0100
parents a244b18cb916
children 3c914bc670a2
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rev   line source
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package auth
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15
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16 import (
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17 "encoding/base64"
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18 "errors"
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19 "io"
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20 "sync"
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21 "time"
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22
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23 "gemma.intevation.de/gemma/pkg/common"
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24 "gemma.intevation.de/gemma/pkg/misc"
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25 )
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26
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27 type Roles []string
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28
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29 type Session struct {
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30 ExpiresAt int64 `json:"expires"`
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31 User string `json:"user"`
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32 Roles Roles `json:"roles"`
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33
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34 // private fields for managing expiration.
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35 access time.Time
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36 mu sync.Mutex
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37 }
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38
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39 func (r Roles) Has(role string) bool {
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40 for _, x := range r {
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41 if x == role {
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42 return true
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43 }
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44 }
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45 return false
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46 }
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47
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48 func (r Roles) HasAny(roles ...string) bool {
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49 for _, y := range roles {
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50 if r.Has(y) {
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51 return true
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52 }
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53 }
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54 return false
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55 }
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56
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57 const (
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58 sessionKeyLength = 20
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59 maxTokenValid = time.Hour * 3
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60 )
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61
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62 func NewSession(user, password string, roles Roles) *Session {
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63
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64 // Create the Claims
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65 return &Session{
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66 ExpiresAt: time.Now().Add(maxTokenValid).Unix(),
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67 User: user,
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68 Roles: roles,
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69 }
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70 }
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71
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72 func (s *Session) serialize(w io.Writer) error {
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73
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74 access, err := s.last().MarshalText()
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75 if err != nil {
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76 return err
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77 }
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78
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79 wr := misc.BinWriter{Writer: w, Err: nil}
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80 wr.WriteBin(s.ExpiresAt)
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81 wr.WriteString(s.User)
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82 wr.WriteBin(uint32(len(s.Roles)))
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83 for _, role := range s.Roles {
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84 wr.WriteString(role)
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85 }
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86 wr.WriteBin(uint32(len(access)))
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87 wr.WriteBin(access)
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88 return wr.Err
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89 }
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90
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91 func (s *Session) deserialize(r io.Reader) error {
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92
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93 var session Session
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94
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95 var n uint32
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96 rd := misc.BinReader{Reader: r, Err: nil}
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97 rd.ReadBin(&session.ExpiresAt)
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98 rd.ReadString(&session.User)
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99 rd.ReadBin(&n)
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100 session.Roles = make(Roles, n)
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101
193
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102 for i := uint32(0); n > 0 && i < n; i++ {
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103 rd.ReadString(&session.Roles[i])
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104 }
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105
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106 if rd.Err != nil {
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107 return rd.Err
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108 }
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109
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110 var l uint32
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111 rd.ReadBin(&l)
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112 access := make([]byte, l)
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113 rd.ReadBin(access)
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114
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115 if rd.Err != nil {
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116 return rd.Err
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117 }
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118
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119 var t time.Time
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120 if err := t.UnmarshalText(access); err != nil {
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121 return err
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122 }
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123
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124 session.access = t
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125
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126 *s = session
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127
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128 return nil
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129 }
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130
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131 func (c *Session) touch() {
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132 c.mu.Lock()
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133 c.access = time.Now()
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134 c.mu.Unlock()
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135 }
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136
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137 func (c *Session) last() time.Time {
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138 c.mu.Lock()
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139 access := c.access
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140 c.mu.Unlock()
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141 return access
193
1585c334e8a7 More on persisting sessions.
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142 }
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143
134
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144 func GenerateSessionKey() string {
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33b59c848771 Factored out some miscellaneous code into own package.
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145 return base64.URLEncoding.EncodeToString(
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ac23905e64b1 Improve WFS proxy a lot. It now generates signed re-writings.
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146 common.GenerateRandomKey(sessionKeyLength))
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147 }
124
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148
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149 var ErrInvalidRole = errors.New("Invalid role")
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150
134
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151 func GenerateSession(user, password string) (string, *Session, error) {
124
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152 roles, err := AllOtherRoles(user, password)
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153 if err != nil {
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154 return "", nil, err
124
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155 }
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156 if !roles.HasAny("sys_admin", "waterway_admin", "waterway_user") {
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157 return "", nil, ErrInvalidRole
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158 }
134
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159 token := GenerateSessionKey()
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160 session := NewSession(user, password, roles)
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161 Sessions.Add(token, session)
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162 return token, session, nil
124
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163 }