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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/srv_dec_tkt.c */
/*
* Copyright 2006, 2008 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.
*/
/*
* Server decrypt ticket via keytab or keyblock.
*
* Different from krb5_rd_req_decoded. (krb5/src/lib/krb5/krb/rd_req_dec.c)
* - No krb5_principal_compare or KRB5KRB_AP_ERR_BADMATCH error.
* - No replay cache processing.
* - No skew checking or KRB5KRB_AP_ERR_SKEW error.
* - No address checking or KRB5KRB_AP_ERR_BADADDR error.
* - No time validation.
* - No permitted enctype validation or KRB5_NOPERM_ETYPE error.
* - Does not free ticket->enc_part2 on error.
*/
#include <k5-int.h>
#ifndef LEAN_CLIENT
static krb5_error_code
decrypt_ticket_keyblock(krb5_context context, const krb5_keyblock *key,
krb5_ticket *ticket)
{
krb5_error_code retval;
krb5_data *realm;
krb5_transited *trans;
retval = krb5_decrypt_tkt_part(context, key, ticket);
if (retval)
goto done;
trans = &ticket->enc_part2->transited;
realm = &ticket->enc_part2->client->realm;
if (trans->tr_contents.data && *trans->tr_contents.data) {
retval = krb5_check_transited_list(context, &trans->tr_contents,
realm, &ticket->server->realm);
goto done;
}
if (ticket->enc_part2->flags & TKT_FLG_INVALID) { /* ie, KDC_OPT_POSTDATED */
retval = KRB5KRB_AP_ERR_TKT_INVALID;
goto done;
}
done:
return retval;
}
krb5_error_code KRB5_CALLCONV
krb5_server_decrypt_ticket_keytab(krb5_context context,
const krb5_keytab keytab,
krb5_ticket *ticket)
{
krb5_error_code retval;
krb5_keytab_entry ktent;
if (keytab->ops->start_seq_get == NULL) {
retval = krb5_kt_get_entry(context, keytab,
ticket->server,
ticket->enc_part.kvno,
ticket->enc_part.enctype, &ktent);
if (retval == 0) {
retval = decrypt_ticket_keyblock(context, &ktent.key, ticket);
(void) krb5_free_keytab_entry_contents(context, &ktent);
}
} else {
krb5_error_code code;
krb5_kt_cursor cursor;
retval = krb5_kt_start_seq_get(context, keytab, &cursor);
if (retval != 0)
goto map_error;
retval = KRB5_KT_NOTFOUND;
while ((code = krb5_kt_next_entry(context, keytab,
&ktent, &cursor)) == 0) {
if (ktent.key.enctype != ticket->enc_part.enctype)
continue;
retval = decrypt_ticket_keyblock(context, &ktent.key, ticket);
if (retval == 0) {
krb5_principal tmp;
retval = krb5_copy_principal(context, ktent.principal, &tmp);
if (retval == 0) {
krb5_free_principal(context, ticket->server);
ticket->server = tmp;
}
(void) krb5_free_keytab_entry_contents(context, &ktent);
break;
}
(void) krb5_free_keytab_entry_contents(context, &ktent);
}
code = krb5_kt_end_seq_get(context, keytab, &cursor);
if (code != 0)
retval = code;
}
map_error:
switch (retval) {
case KRB5_KT_KVNONOTFOUND:
case KRB5_KT_NOTFOUND:
case KRB5KRB_AP_ERR_BAD_INTEGRITY:
retval = KRB5KRB_AP_WRONG_PRINC;
break;
default:
break;
}
return retval;
}
#endif /* LEAN_CLIENT */
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