69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
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// Package kadmin provides Kerberos administration capabilities.
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package kadmin
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import (
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"github.com/jcmturner/gokrb5/v8/crypto"
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"github.com/jcmturner/gokrb5/v8/krberror"
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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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// ChangePasswdMsg generate a change password request and also return the key needed to decrypt the reply.
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func ChangePasswdMsg(cname types.PrincipalName, realm, password string, tkt messages.Ticket, sessionKey types.EncryptionKey) (r Request, k types.EncryptionKey, err error) {
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// Create change password data struct and marshal to bytes
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chgpasswd := ChangePasswdData{
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NewPasswd: []byte(password),
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TargName: cname,
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TargRealm: realm,
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}
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chpwdb, err := chgpasswd.Marshal()
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if err != nil {
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err = krberror.Errorf(err, krberror.KRBMsgError, "error marshaling change passwd data")
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return
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}
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// Generate authenticator
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auth, err := types.NewAuthenticator(realm, cname)
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if err != nil {
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err = krberror.Errorf(err, krberror.KRBMsgError, "error generating new authenticator")
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return
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}
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etype, err := crypto.GetEtype(sessionKey.KeyType)
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if err != nil {
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err = krberror.Errorf(err, krberror.KRBMsgError, "error generating subkey etype")
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return
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}
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err = auth.GenerateSeqNumberAndSubKey(etype.GetETypeID(), etype.GetKeyByteSize())
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if err != nil {
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err = krberror.Errorf(err, krberror.KRBMsgError, "error generating subkey")
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return
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}
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k = auth.SubKey
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// Generate AP_REQ
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APreq, err := messages.NewAPReq(tkt, sessionKey, auth)
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if err != nil {
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return
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}
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// Form the KRBPriv encpart data
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kp := messages.EncKrbPrivPart{
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UserData: chpwdb,
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Timestamp: auth.CTime,
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Usec: auth.Cusec,
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SequenceNumber: auth.SeqNumber,
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}
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kpriv := messages.NewKRBPriv(kp)
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err = kpriv.EncryptEncPart(k)
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if err != nil {
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err = krberror.Errorf(err, krberror.EncryptingError, "error encrypting change passwd data")
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return
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}
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r = Request{
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APREQ: APreq,
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KRBPriv: kpriv,
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}
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return
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}
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