diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/changepasswddata.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/changepasswddata.go
new file mode 100644
index 0000000..a3e2efd
--- /dev/null
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/changepasswddata.go
@@ -0,0 +1,23 @@
+package kadmin
+
+import (
+	"github.com/jcmturner/gofork/encoding/asn1"
+	"gopkg.in/jcmturner/gokrb5.v7/types"
+)
+
+// ChangePasswdData is the payload to a password change message.
+type ChangePasswdData struct {
+	NewPasswd []byte              `asn1:"explicit,tag:0"`
+	TargName  types.PrincipalName `asn1:"explicit,optional,tag:1"`
+	TargRealm string              `asn1:"generalstring,optional,explicit,tag:2"`
+}
+
+// Marshal ChangePasswdData into a byte slice.
+func (c *ChangePasswdData) Marshal() ([]byte, error) {
+	b, err := asn1.Marshal(*c)
+	if err != nil {
+		return []byte{}, err
+	}
+	//b = asn1tools.AddASNAppTag(b, asnAppTag.)
+	return b, nil
+}
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/message.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/message.go
new file mode 100644
index 0000000..157fcad
--- /dev/null
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/message.go
@@ -0,0 +1,114 @@
+package kadmin
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"math"
+
+	"gopkg.in/jcmturner/gokrb5.v7/messages"
+	"gopkg.in/jcmturner/gokrb5.v7/types"
+)
+
+const (
+	verisonHex = "ff80"
+)
+
+// Request message for changing password.
+type Request struct {
+	APREQ   messages.APReq
+	KRBPriv messages.KRBPriv
+}
+
+// Reply message for a password change.
+type Reply struct {
+	MessageLength int
+	Version       int
+	APREPLength   int
+	APREP         messages.APRep
+	KRBPriv       messages.KRBPriv
+	KRBError      messages.KRBError
+	IsKRBError    bool
+	ResultCode    uint16
+	Result        string
+}
+
+// Marshal a Request into a byte slice.
+func (m *Request) Marshal() (b []byte, err error) {
+	b = []byte{255, 128} // protocol version number: contains the hex constant 0xff80 (big-endian integer).
+	ab, e := m.APREQ.Marshal()
+	if e != nil {
+		err = fmt.Errorf("error marshaling AP_REQ: %v", e)
+		return
+	}
+	if len(ab) > math.MaxUint16 {
+		err = errors.New("length of AP_REQ greater then max Uint16 size")
+		return
+	}
+	al := make([]byte, 2)
+	binary.BigEndian.PutUint16(al, uint16(len(ab)))
+	b = append(b, al...)
+	b = append(b, ab...)
+	pb, e := m.KRBPriv.Marshal()
+	if e != nil {
+		err = fmt.Errorf("error marshaling KRB_Priv: %v", e)
+		return
+	}
+	b = append(b, pb...)
+	if len(b)+2 > math.MaxUint16 {
+		err = errors.New("length of message greater then max Uint16 size")
+		return
+	}
+	ml := make([]byte, 2)
+	binary.BigEndian.PutUint16(ml, uint16(len(b)+2))
+	b = append(ml, b...)
+	return
+}
+
+// Unmarshal a byte slice into a Reply.
+func (m *Reply) Unmarshal(b []byte) error {
+	m.MessageLength = int(binary.BigEndian.Uint16(b[0:2]))
+	m.Version = int(binary.BigEndian.Uint16(b[2:4]))
+	if m.Version != 1 {
+		return fmt.Errorf("kadmin reply has incorrect protocol version number: %d", m.Version)
+	}
+	m.APREPLength = int(binary.BigEndian.Uint16(b[4:6]))
+	if m.APREPLength != 0 {
+		err := m.APREP.Unmarshal(b[6 : 6+m.APREPLength])
+		if err != nil {
+			return err
+		}
+		err = m.KRBPriv.Unmarshal(b[6+m.APREPLength : m.MessageLength])
+		if err != nil {
+			return err
+		}
+	} else {
+		m.IsKRBError = true
+		m.KRBError.Unmarshal(b[6:m.MessageLength])
+		m.ResultCode, m.Result = parseResponse(m.KRBError.EData)
+	}
+	return nil
+}
+
+func parseResponse(b []byte) (c uint16, s string) {
+	c = binary.BigEndian.Uint16(b[0:2])
+	buf := bytes.NewBuffer(b[2:])
+	m := make([]byte, len(b)-2)
+	binary.Read(buf, binary.BigEndian, &m)
+	s = string(m)
+	return
+}
+
+// Decrypt the encrypted part of the KRBError within the change password Reply.
+func (m *Reply) Decrypt(key types.EncryptionKey) error {
+	if m.IsKRBError {
+		return m.KRBError
+	}
+	err := m.KRBPriv.DecryptEncPart(key)
+	if err != nil {
+		return err
+	}
+	m.ResultCode, m.Result = parseResponse(m.KRBPriv.DecryptedEncPart.UserData)
+	return nil
+}
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/passwd.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/passwd.go
new file mode 100644
index 0000000..2a7491a
--- /dev/null
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/kadmin/passwd.go
@@ -0,0 +1,68 @@
+// Package kadmin provides Kerberos administration capabilities.
+package kadmin
+
+import (
+	"gopkg.in/jcmturner/gokrb5.v7/crypto"
+	"gopkg.in/jcmturner/gokrb5.v7/krberror"
+	"gopkg.in/jcmturner/gokrb5.v7/messages"
+	"gopkg.in/jcmturner/gokrb5.v7/types"
+)
+
+// ChangePasswdMsg generate a change password request and also return the key needed to decrypt the reply.
+func ChangePasswdMsg(cname types.PrincipalName, realm, password string, tkt messages.Ticket, sessionKey types.EncryptionKey) (r Request, k types.EncryptionKey, err error) {
+	// Create change password data struct and marshal to bytes
+	chgpasswd := ChangePasswdData{
+		NewPasswd: []byte(password),
+		TargName:  cname,
+		TargRealm: realm,
+	}
+	chpwdb, err := chgpasswd.Marshal()
+	if err != nil {
+		err = krberror.Errorf(err, krberror.KRBMsgError, "error marshaling change passwd data")
+		return
+	}
+
+	// Generate authenticator
+	auth, err := types.NewAuthenticator(realm, cname)
+	if err != nil {
+		err = krberror.Errorf(err, krberror.KRBMsgError, "error generating new authenticator")
+		return
+	}
+	etype, err := crypto.GetEtype(sessionKey.KeyType)
+	if err != nil {
+		err = krberror.Errorf(err, krberror.KRBMsgError, "error generating subkey etype")
+		return
+	}
+	err = auth.GenerateSeqNumberAndSubKey(etype.GetETypeID(), etype.GetKeyByteSize())
+	if err != nil {
+		err = krberror.Errorf(err, krberror.KRBMsgError, "error generating subkey")
+		return
+	}
+	k = auth.SubKey
+
+	// Generate AP_REQ
+	APreq, err := messages.NewAPReq(tkt, sessionKey, auth)
+	if err != nil {
+		return
+	}
+
+	// Form the KRBPriv encpart data
+	kp := messages.EncKrbPrivPart{
+		UserData:       chpwdb,
+		Timestamp:      auth.CTime,
+		Usec:           auth.Cusec,
+		SequenceNumber: auth.SeqNumber,
+	}
+	kpriv := messages.NewKRBPriv(kp)
+	err = kpriv.EncryptEncPart(k)
+	if err != nil {
+		err = krberror.Errorf(err, krberror.EncryptingError, "error encrypting change passwd data")
+		return
+	}
+
+	r = Request{
+		APREQ:   APreq,
+		KRBPriv: kpriv,
+	}
+	return
+}