annotate pkg/auth/session.go @ 1323:3c914bc670a2

Avoid copying session data while deserializing from store. This involed copying a mutex which would technical be not correct if the mutex would be used at this time, which it is not. go vet was not happy about this even if its not a problem. Not copying the data makes it a bit faster, though.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 24 Nov 2018 17:08:56 +0100
parents 176c42053562
children ea2143adc6d3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1017
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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 n uint32
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94 rd := misc.BinReader{Reader: r, Err: nil}
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95 rd.ReadBin(&s.ExpiresAt)
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96 rd.ReadString(&s.User)
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97 rd.ReadBin(&n)
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98 s.Roles = make(Roles, n)
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99
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100 for i := uint32(0); n > 0 && i < n; i++ {
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101 rd.ReadString(&s.Roles[i])
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102 }
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103
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104 if rd.Err != nil {
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105 return rd.Err
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106 }
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107
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108 var l uint32
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109 rd.ReadBin(&l)
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110 access := make([]byte, l)
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111 rd.ReadBin(access)
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112
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113 if rd.Err != nil {
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114 return rd.Err
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115 }
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116
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117 var t time.Time
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118 if err := t.UnmarshalText(access); err != nil {
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119 return err
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120 }
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121
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122 s.access = t
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123
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124 return nil
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125 }
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126
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127 func (c *Session) touch() {
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128 c.mu.Lock()
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129 c.access = time.Now()
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130 c.mu.Unlock()
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131 }
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132
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133 func (c *Session) last() time.Time {
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134 c.mu.Lock()
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135 access := c.access
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136 c.mu.Unlock()
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137 return access
193
1585c334e8a7 More on persisting sessions.
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138 }
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139
134
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140 func GenerateSessionKey() string {
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33b59c848771 Factored out some miscellaneous code into own package.
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141 return base64.URLEncoding.EncodeToString(
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ac23905e64b1 Improve WFS proxy a lot. It now generates signed re-writings.
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142 common.GenerateRandomKey(sessionKeyLength))
119
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143 }
124
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144
447
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145 var ErrInvalidRole = errors.New("Invalid role")
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146
134
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147 func GenerateSession(user, password string) (string, *Session, error) {
124
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148 roles, err := AllOtherRoles(user, password)
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149 if err != nil {
134
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150 return "", nil, err
124
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151 }
447
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152 if !roles.HasAny("sys_admin", "waterway_admin", "waterway_user") {
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153 return "", nil, ErrInvalidRole
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154 }
134
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155 token := GenerateSessionKey()
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156 session := NewSession(user, password, roles)
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8a0737aa6ab6 The connection pool is now only a session store.
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157 Sessions.Add(token, session)
134
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158 return token, session, nil
124
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159 }