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