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
|
package ldap
import (
"errors"
"fmt"
"gopkg.in/asn1-ber.v1"
)
// SimpleBindRequest represents a username/password bind operation
type SimpleBindRequest struct {
// Username is the name of the Directory object that the client wishes to bind as
Username string
// Password is the credentials to bind with
Password string
// Controls are optional controls to send with the bind request
Controls []Control
// AllowEmptyPassword sets whether the client allows binding with an empty password
// (normally used for unauthenticated bind).
AllowEmptyPassword bool
}
// SimpleBindResult contains the response from the server
type SimpleBindResult struct {
Controls []Control
}
// NewSimpleBindRequest returns a bind request
func NewSimpleBindRequest(username string, password string, controls []Control) *SimpleBindRequest {
return &SimpleBindRequest{
Username: username,
Password: password,
Controls: controls,
AllowEmptyPassword: false,
}
}
func (bindRequest *SimpleBindRequest) encode() *ber.Packet {
request := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationBindRequest, nil, "Bind Request")
request.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, 3, "Version"))
request.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, bindRequest.Username, "User Name"))
request.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, 0, bindRequest.Password, "Password"))
return request
}
// SimpleBind performs the simple bind operation defined in the given request
func (l *Conn) SimpleBind(simpleBindRequest *SimpleBindRequest) (*SimpleBindResult, error) {
if simpleBindRequest.Password == "" && !simpleBindRequest.AllowEmptyPassword {
return nil, NewError(ErrorEmptyPassword, errors.New("ldap: empty password not allowed by the client"))
}
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
encodedBindRequest := simpleBindRequest.encode()
packet.AppendChild(encodedBindRequest)
if len(simpleBindRequest.Controls) > 0 {
packet.AppendChild(encodeControls(simpleBindRequest.Controls))
}
if l.Debug {
ber.PrintPacket(packet)
}
msgCtx, err := l.sendMessage(packet)
if err != nil {
return nil, err
}
defer l.finishMessage(msgCtx)
packetResponse, ok := <-msgCtx.responses
if !ok {
return nil, NewError(ErrorNetwork, errors.New("ldap: response channel closed"))
}
packet, err = packetResponse.ReadPacket()
l.Debug.Printf("%d: got response %p", msgCtx.id, packet)
if err != nil {
return nil, err
}
if l.Debug {
if err = addLDAPDescriptions(packet); err != nil {
return nil, err
}
ber.PrintPacket(packet)
}
result := &SimpleBindResult{
Controls: make([]Control, 0),
}
if len(packet.Children) == 3 {
for _, child := range packet.Children[2].Children {
decodedChild, decodeErr := DecodeControl(child)
if decodeErr != nil {
return nil, fmt.Errorf("failed to decode child control: %s", decodeErr)
}
result.Controls = append(result.Controls, decodedChild)
}
}
err = GetLDAPError(packet)
return result, err
}
// Bind performs a bind with the given username and password.
//
// It does not allow unauthenticated bind (i.e. empty password). Use the UnauthenticatedBind method
// for that.
func (l *Conn) Bind(username, password string) error {
req := &SimpleBindRequest{
Username: username,
Password: password,
AllowEmptyPassword: false,
}
_, err := l.SimpleBind(req)
return err
}
// UnauthenticatedBind performs an unauthenticated bind.
//
// A username may be provided for trace (e.g. logging) purpose only, but it is normally not
// authenticated or otherwise validated by the LDAP server.
//
// See https://tools.ietf.org/html/rfc4513#section-5.1.2 .
// See https://tools.ietf.org/html/rfc4513#section-6.3.1 .
func (l *Conn) UnauthenticatedBind(username string) error {
req := &SimpleBindRequest{
Username: username,
Password: "",
AllowEmptyPassword: true,
}
_, err := l.SimpleBind(req)
return err
}
|
