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