115 lines
2.7 KiB
Go
115 lines
2.7 KiB
Go
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package kadmin
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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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"fmt"
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"math"
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"github.com/jcmturner/gokrb5/v8/messages"
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"github.com/jcmturner/gokrb5/v8/types"
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)
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const (
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verisonHex = "ff80"
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)
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// Request message for changing password.
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type Request struct {
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APREQ messages.APReq
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KRBPriv messages.KRBPriv
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}
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// Reply message for a password change.
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type Reply struct {
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MessageLength int
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Version int
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APREPLength int
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APREP messages.APRep
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KRBPriv messages.KRBPriv
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KRBError messages.KRBError
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IsKRBError bool
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ResultCode uint16
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Result string
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}
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// Marshal a Request into a byte slice.
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func (m *Request) Marshal() (b []byte, err error) {
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b = []byte{255, 128} // protocol version number: contains the hex constant 0xff80 (big-endian integer).
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ab, e := m.APREQ.Marshal()
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if e != nil {
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err = fmt.Errorf("error marshaling AP_REQ: %v", e)
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return
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}
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if len(ab) > math.MaxUint16 {
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err = errors.New("length of AP_REQ greater then max Uint16 size")
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return
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}
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al := make([]byte, 2)
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binary.BigEndian.PutUint16(al, uint16(len(ab)))
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b = append(b, al...)
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b = append(b, ab...)
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pb, e := m.KRBPriv.Marshal()
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if e != nil {
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err = fmt.Errorf("error marshaling KRB_Priv: %v", e)
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return
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}
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b = append(b, pb...)
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if len(b)+2 > math.MaxUint16 {
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err = errors.New("length of message greater then max Uint16 size")
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return
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}
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ml := make([]byte, 2)
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binary.BigEndian.PutUint16(ml, uint16(len(b)+2))
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b = append(ml, b...)
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return
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}
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// Unmarshal a byte slice into a Reply.
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func (m *Reply) Unmarshal(b []byte) error {
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m.MessageLength = int(binary.BigEndian.Uint16(b[0:2]))
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m.Version = int(binary.BigEndian.Uint16(b[2:4]))
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if m.Version != 1 {
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return fmt.Errorf("kadmin reply has incorrect protocol version number: %d", m.Version)
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}
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m.APREPLength = int(binary.BigEndian.Uint16(b[4:6]))
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if m.APREPLength != 0 {
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err := m.APREP.Unmarshal(b[6 : 6+m.APREPLength])
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if err != nil {
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return err
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}
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err = m.KRBPriv.Unmarshal(b[6+m.APREPLength : m.MessageLength])
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if err != nil {
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return err
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}
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} else {
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m.IsKRBError = true
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m.KRBError.Unmarshal(b[6:m.MessageLength])
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m.ResultCode, m.Result = parseResponse(m.KRBError.EData)
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}
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return nil
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}
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func parseResponse(b []byte) (c uint16, s string) {
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c = binary.BigEndian.Uint16(b[0:2])
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buf := bytes.NewBuffer(b[2:])
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m := make([]byte, len(b)-2)
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binary.Read(buf, binary.BigEndian, &m)
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s = string(m)
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return
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}
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// Decrypt the encrypted part of the KRBError within the change password Reply.
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func (m *Reply) Decrypt(key types.EncryptionKey) error {
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if m.IsKRBError {
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return m.KRBError
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}
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err := m.KRBPriv.DecryptEncPart(key)
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if err != nil {
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return err
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}
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m.ResultCode, m.Result = parseResponse(m.KRBPriv.DecryptedEncPart.UserData)
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return nil
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}
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