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/*
* lib/krb5/krb/mk_rep.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_mk_rep()
*/
#include "k5-int.h"
#include "auth_con.h"
/*
Formats a KRB_AP_REP message into outbuf.
The outbuf buffer storage is allocated, and should be freed by the
caller when finished.
returns system errors
*/
krb5_error_code KRB5_CALLCONV
krb5_mk_rep(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf)
{
krb5_error_code retval;
krb5_ap_rep_enc_part repl;
krb5_ap_rep reply;
krb5_data * scratch;
krb5_data * toutbuf;
/* Make the reply */
if (((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
(auth_context->local_seq_number == 0)) {
if ((retval = krb5_generate_seq_number(context, auth_context->keyblock,
&auth_context->local_seq_number)))
return(retval);
}
repl.ctime = auth_context->authentp->ctime;
repl.cusec = auth_context->authentp->cusec;
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {
retval = krb5int_generate_and_save_subkey (context, auth_context,
auth_context->keyblock);
if (retval)
return retval;
repl.subkey = auth_context->send_subkey;
} else
repl.subkey = auth_context->authentp->subkey;
repl.seq_number = auth_context->local_seq_number;
/* encode it before encrypting */
if ((retval = encode_krb5_ap_rep_enc_part(&repl, &scratch)))
return retval;
if ((retval = krb5_encrypt_helper(context, auth_context->keyblock,
KRB5_KEYUSAGE_AP_REP_ENCPART,
scratch, &reply.enc_part)))
goto cleanup_scratch;
if (!(retval = encode_krb5_ap_rep(&reply, &toutbuf))) {
*outbuf = *toutbuf;
krb5_xfree(toutbuf);
}
memset(reply.enc_part.ciphertext.data, 0, reply.enc_part.ciphertext.length);
free(reply.enc_part.ciphertext.data);
reply.enc_part.ciphertext.length = 0;
reply.enc_part.ciphertext.data = 0;
cleanup_scratch:
memset(scratch->data, 0, scratch->length);
krb5_free_data(context, scratch);
return retval;
}
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