65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
|
package ntlmssp
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"encoding/binary"
|
||
|
|
"errors"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
const expMsgBodyLen = 40
|
||
|
|
|
||
|
|
type negotiateMessageFields struct {
|
||
|
|
messageHeader
|
||
|
|
NegotiateFlags negotiateFlags
|
||
|
|
|
||
|
|
Domain varField
|
||
|
|
Workstation varField
|
||
|
|
|
||
|
|
Version
|
||
|
|
}
|
||
|
|
|
||
|
|
var defaultFlags = negotiateFlagNTLMSSPNEGOTIATETARGETINFO |
|
||
|
|
negotiateFlagNTLMSSPNEGOTIATE56 |
|
||
|
|
negotiateFlagNTLMSSPNEGOTIATE128 |
|
||
|
|
negotiateFlagNTLMSSPNEGOTIATEUNICODE |
|
||
|
|
negotiateFlagNTLMSSPNEGOTIATEEXTENDEDSESSIONSECURITY
|
||
|
|
|
||
|
|
//NewNegotiateMessage creates a new NEGOTIATE message with the
|
||
|
|
//flags that this package supports.
|
||
|
|
func NewNegotiateMessage(domainName, workstationName string) ([]byte, error) {
|
||
|
|
payloadOffset := expMsgBodyLen
|
||
|
|
flags := defaultFlags
|
||
|
|
|
||
|
|
if domainName != "" {
|
||
|
|
flags |= negotiateFlagNTLMSSPNEGOTIATEOEMDOMAINSUPPLIED
|
||
|
|
}
|
||
|
|
|
||
|
|
if workstationName != "" {
|
||
|
|
flags |= negotiateFlagNTLMSSPNEGOTIATEOEMWORKSTATIONSUPPLIED
|
||
|
|
}
|
||
|
|
|
||
|
|
msg := negotiateMessageFields{
|
||
|
|
messageHeader: newMessageHeader(1),
|
||
|
|
NegotiateFlags: flags,
|
||
|
|
Domain: newVarField(&payloadOffset, len(domainName)),
|
||
|
|
Workstation: newVarField(&payloadOffset, len(workstationName)),
|
||
|
|
Version: DefaultVersion(),
|
||
|
|
}
|
||
|
|
|
||
|
|
b := bytes.Buffer{}
|
||
|
|
if err := binary.Write(&b, binary.LittleEndian, &msg); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if b.Len() != expMsgBodyLen {
|
||
|
|
return nil, errors.New("incorrect body length")
|
||
|
|
}
|
||
|
|
|
||
|
|
payload := strings.ToUpper(domainName + workstationName)
|
||
|
|
if _, err := b.WriteString(payload); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return b.Bytes(), nil
|
||
|
|
}
|