telebit/vendor/github.com/jcmturner/gokrb5/v8/client/passwd.go

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2020-06-03 06:18:04 +00:00
package client
import (
"fmt"
"net"
"github.com/jcmturner/gokrb5/v8/kadmin"
"github.com/jcmturner/gokrb5/v8/messages"
)
// Kpasswd server response codes.
const (
KRB5_KPASSWD_SUCCESS = 0
KRB5_KPASSWD_MALFORMED = 1
KRB5_KPASSWD_HARDERROR = 2
KRB5_KPASSWD_AUTHERROR = 3
KRB5_KPASSWD_SOFTERROR = 4
KRB5_KPASSWD_ACCESSDENIED = 5
KRB5_KPASSWD_BAD_VERSION = 6
KRB5_KPASSWD_INITIAL_FLAG_NEEDED = 7
)
// ChangePasswd changes the password of the client to the value provided.
func (cl *Client) ChangePasswd(newPasswd string) (bool, error) {
ASReq, err := messages.NewASReqForChgPasswd(cl.Credentials.Domain(), cl.Config, cl.Credentials.CName())
if err != nil {
return false, err
}
ASRep, err := cl.ASExchange(cl.Credentials.Domain(), ASReq, 0)
if err != nil {
return false, err
}
msg, key, err := kadmin.ChangePasswdMsg(cl.Credentials.CName(), cl.Credentials.Domain(), newPasswd, ASRep.Ticket, ASRep.DecryptedEncPart.Key)
if err != nil {
return false, err
}
r, err := cl.sendToKPasswd(msg)
if err != nil {
return false, err
}
err = r.Decrypt(key)
if err != nil {
return false, err
}
if r.ResultCode != KRB5_KPASSWD_SUCCESS {
return false, fmt.Errorf("error response from kadmin: code: %d; result: %s; krberror: %v", r.ResultCode, r.Result, r.KRBError)
}
cl.Credentials.WithPassword(newPasswd)
return true, nil
}
func (cl *Client) sendToKPasswd(msg kadmin.Request) (r kadmin.Reply, err error) {
_, kps, err := cl.Config.GetKpasswdServers(cl.Credentials.Domain(), true)
if err != nil {
return
}
addr := kps[1]
b, err := msg.Marshal()
if err != nil {
return
}
if len(b) <= cl.Config.LibDefaults.UDPPreferenceLimit {
return cl.sendKPasswdUDP(b, addr)
}
return cl.sendKPasswdTCP(b, addr)
}
func (cl *Client) sendKPasswdTCP(b []byte, kadmindAddr string) (r kadmin.Reply, err error) {
tcpAddr, err := net.ResolveTCPAddr("tcp", kadmindAddr)
if err != nil {
return
}
conn, err := net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
return
}
rb, err := cl.sendTCP(conn, b)
err = r.Unmarshal(rb)
return
}
func (cl *Client) sendKPasswdUDP(b []byte, kadmindAddr string) (r kadmin.Reply, err error) {
udpAddr, err := net.ResolveUDPAddr("udp", kadmindAddr)
if err != nil {
return
}
conn, err := net.DialUDP("udp", nil, udpAddr)
if err != nil {
return
}
rb, err := cl.sendUDP(conn, b)
err = r.Unmarshal(rb)
return
}