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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
package authentication
import (
"fmt"
"strings"
"github.com/clems4ever/authelia/internal/configuration/schema"
"gopkg.in/ldap.v3"
)
// LDAPUserProvider is a provider using a LDAP or AD as a user database.
type LDAPUserProvider struct {
configuration schema.LDAPAuthenticationBackendConfiguration
}
func (p *LDAPUserProvider) connect(userDN string, password string) (*ldap.Conn, error) {
conn, err := ldap.Dial("tcp", p.configuration.URL)
if err != nil {
return nil, err
}
err = conn.Bind(userDN, password)
if err != nil {
return nil, err
}
return conn, nil
}
// NewLDAPUserProvider creates a new instance of LDAPUserProvider.
func NewLDAPUserProvider(configuration schema.LDAPAuthenticationBackendConfiguration) *LDAPUserProvider {
return &LDAPUserProvider{configuration}
}
// CheckUserPassword checks if provided password matches for the given user.
func (p *LDAPUserProvider) CheckUserPassword(username string, password string) (bool, error) {
adminClient, err := p.connect(p.configuration.User, p.configuration.Password)
if err != nil {
return false, err
}
defer adminClient.Close()
userDN, err := p.getUserDN(adminClient, username)
if err != nil {
return false, err
}
conn, err := p.connect(userDN, password)
if err != nil {
return false, fmt.Errorf("Authentication of user %s failed. Cause: %s", username, err)
}
defer conn.Close()
return true, nil
}
func (p *LDAPUserProvider) getUserAttribute(conn *ldap.Conn, username string, attribute string) ([]string, error) {
client, err := p.connect(p.configuration.User, p.configuration.Password)
if err != nil {
return nil, err
}
defer client.Close()
userFilter := strings.Replace(p.configuration.UsersFilter, "{0}", username, -1)
baseDN := p.configuration.AdditionalUsersDN + "," + p.configuration.BaseDN
// Search for the given username
searchRequest := ldap.NewSearchRequest(
baseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
1, 0, false, userFilter, []string{attribute}, nil,
)
sr, err := client.Search(searchRequest)
if err != nil {
return nil, fmt.Errorf("Cannot find user DN of user %s. Cause: %s", username, err)
}
if len(sr.Entries) != 1 {
return nil, fmt.Errorf("No %s found for user %s", attribute, username)
}
if attribute == "dn" {
return []string{sr.Entries[0].DN}, nil
}
return sr.Entries[0].Attributes[0].Values, nil
}
func (p *LDAPUserProvider) getUserDN(conn *ldap.Conn, username string) (string, error) {
values, err := p.getUserAttribute(conn, username, "dn")
if err != nil {
return "", err
}
if len(values) != 1 {
return "", fmt.Errorf("DN attribute of user %s must be set", username)
}
return values[0], nil
}
func (p *LDAPUserProvider) getUserUID(conn *ldap.Conn, username string) (string, error) {
values, err := p.getUserAttribute(conn, username, "uid")
if err != nil {
return "", err
}
if len(values) != 1 {
return "", fmt.Errorf("UID attribute of user %s must be set", username)
}
return values[0], nil
}
func (p *LDAPUserProvider) createGroupsFilter(conn *ldap.Conn, username string) (string, error) {
if strings.Index(p.configuration.GroupsFilter, "{0}") >= 0 {
return strings.Replace(p.configuration.GroupsFilter, "{0}", username, -1), nil
} else if strings.Index(p.configuration.GroupsFilter, "{dn}") >= 0 {
userDN, err := p.getUserDN(conn, username)
if err != nil {
return "", err
}
return strings.Replace(p.configuration.GroupsFilter, "{dn}", userDN, -1), nil
} else if strings.Index(p.configuration.GroupsFilter, "{uid}") >= 0 {
userUID, err := p.getUserUID(conn, username)
if err != nil {
return "", err
}
return strings.Replace(p.configuration.GroupsFilter, "{uid}", userUID, -1), nil
}
return p.configuration.GroupsFilter, nil
}
// GetDetails retrieve the groups a user belongs to.
func (p *LDAPUserProvider) GetDetails(username string) (*UserDetails, error) {
conn, err := p.connect(p.configuration.User, p.configuration.Password)
if err != nil {
return nil, err
}
defer conn.Close()
groupsFilter, err := p.createGroupsFilter(conn, username)
if err != nil {
return nil, fmt.Errorf("Unable to create group filter for user %s. Cause: %s", username, err)
}
groupBaseDN := fmt.Sprintf("%s,%s", p.configuration.AdditionalGroupsDN, p.configuration.BaseDN)
// Search for the given username
searchGroupRequest := ldap.NewSearchRequest(
groupBaseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
0, 0, false, groupsFilter, []string{p.configuration.GroupNameAttribute}, nil,
)
sr, err := conn.Search(searchGroupRequest)
if err != nil {
return nil, fmt.Errorf("Unable to retrieve groups of user %s. Cause: %s", username, err)
}
groups := make([]string, 0)
for _, res := range sr.Entries {
// append all values of the document. Normally there should be only one per document.
groups = append(groups, res.Attributes[0].Values...)
}
userDN, err := p.getUserDN(conn, username)
if err != nil {
return nil, err
}
searchEmailRequest := ldap.NewSearchRequest(
userDN, ldap.ScopeBaseObject, ldap.NeverDerefAliases,
0, 0, false, "(cn=*)", []string{p.configuration.MailAttribute}, nil,
)
sr, err = conn.Search(searchEmailRequest)
if err != nil {
return nil, fmt.Errorf("Unable to retrieve email of user %s. Cause: %s", username, err)
}
emails := make([]string, 0)
for _, res := range sr.Entries {
// append all values of the document. Normally there should be only one per document.
emails = append(emails, res.Attributes[0].Values...)
}
return &UserDetails{
Emails: emails,
Groups: groups,
}, nil
}
// UpdatePassword update the password of the given user.
func (p *LDAPUserProvider) UpdatePassword(username string, newPassword string) error {
client, err := p.connect(p.configuration.User, p.configuration.Password)
if err != nil {
return fmt.Errorf("Unable to update password. Cause: %s", err)
}
userDN, err := p.getUserDN(client, username)
if err != nil {
return fmt.Errorf("Unable to update password. Cause: %s", err)
}
modifyRequest := ldap.NewModifyRequest(userDN, nil)
modifyRequest.Replace("userPassword", []string{newPassword})
err = client.Modify(modifyRequest)
if err != nil {
return fmt.Errorf("Unable to update password. Cause: %s", err)
}
return nil
}
|
