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request.go
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request.go
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package ldap
import (
"errors"
ber "github.com/go-asn1-ber/asn1-ber"
)
var (
errRespChanClosed = errors.New("ldap: response channel closed")
errCouldNotRetMsg = errors.New("ldap: could not retrieve message")
// ErrNilConnection is returned if doRequest is called with a nil connection.
ErrNilConnection = errors.New("ldap: conn is nil, expected net.Conn")
)
type request interface {
appendTo(*ber.Packet) error
}
type requestFunc func(*ber.Packet) error
func (f requestFunc) appendTo(p *ber.Packet) error {
return f(p)
}
func (l *Conn) doRequest(req request) (*messageContext, error) {
if l == nil || l.conn == nil {
return nil, ErrNilConnection
}
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"))
if err := req.appendTo(packet); err != nil {
return nil, err
}
if l.Debug {
l.Debug.PrintPacket(packet)
}
msgCtx, err := l.sendMessage(packet)
if err != nil {
return nil, err
}
l.Debug.Printf("%d: returning", msgCtx.id)
return msgCtx, nil
}
func (l *Conn) readPacket(msgCtx *messageContext) (*ber.Packet, error) {
l.Debug.Printf("%d: waiting for response", msgCtx.id)
packetResponse, ok := <-msgCtx.responses
if !ok {
return nil, NewError(ErrorNetwork, errRespChanClosed)
}
packet, err := packetResponse.ReadPacket()
l.Debug.Printf("%d: got response %p", msgCtx.id, packet)
if err != nil {
return nil, err
}
if packet == nil {
return nil, NewError(ErrorNetwork, errCouldNotRetMsg)
}
if l.Debug {
if err = addLDAPDescriptions(packet); err != nil {
return nil, err
}
l.Debug.PrintPacket(packet)
}
return packet, nil
}
func getReferral(err error, packet *ber.Packet) (referral string) {
if !IsErrorWithCode(err, LDAPResultReferral) {
return ""
}
if len(packet.Children) < 2 {
return ""
}
// The packet Tag itself (of child 2) is generally a ber.TagObjectDescriptor with referrals however OpenLDAP
// seemingly returns a ber.Tag.GeneralizedTime. Every currently tested LDAP server which returns referrals returns
// an ASN.1 BER packet with the Type of ber.TypeConstructed and Class of ber.ClassApplication however. Thus this
// check expressly checks these fields instead.
//
// Related Issues:
// - https://github.com/authelia/authelia/issues/4199 (downstream)
if len(packet.Children[1].Children) == 0 || (packet.Children[1].TagType != ber.TypeConstructed || packet.Children[1].ClassType != ber.ClassApplication) {
return ""
}
var ok bool
for _, child := range packet.Children[1].Children {
// The referral URI itself should be contained within a child which has a Tag of ber.BitString or
// ber.TagPrintableString, and the Type of ber.TypeConstructed and the Class of ClassContext. As soon as any of
// these conditions is not true we can skip this child.
if (child.Tag != ber.TagBitString && child.Tag != ber.TagPrintableString) || child.TagType != ber.TypeConstructed || child.ClassType != ber.ClassContext {
continue
}
if referral, ok = child.Children[0].Value.(string); ok {
return referral
}
}
return ""
}