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/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZCheckAuthentication function.
*
* Created by: Robert French
*
* Copyright (c) 1987,1991 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include "internal.h"
/* Check authentication of the notice.
If it looks authentic but fails the Kerberos check, return -1.
If it looks authentic and passes the Kerberos check, return 1.
If it doesn't look authentic, return 0
When not using Kerberos, return true if the notice claims to be authentic.
Only used by clients; the server uses its own routine.
*/
Code_t ZCheckAuthentication(notice, from)
ZNotice_t *notice;
struct sockaddr_in *from;
{
#ifdef ZEPHYR_USES_KERBEROS
int result;
ZChecksum_t our_checksum;
CREDENTIALS cred;
/* If the value is already known, return it. */
if (notice->z_checked_auth != ZAUTH_UNSET)
return (notice->z_checked_auth);
if (!notice->z_auth)
return (ZAUTH_NO);
if ((result = krb_get_cred(SERVER_SERVICE, SERVER_INSTANCE,
__Zephyr_realm, &cred)) != 0)
return (ZAUTH_NO);
#ifdef NOENCRYPTION
our_checksum = 0;
#else
our_checksum = des_quad_cksum(notice->z_packet, NULL,
notice->z_default_format+
strlen(notice->z_default_format)+1-
notice->z_packet, 0, (C_Block *)cred.session);
#endif
/* if mismatched checksum, then the packet was corrupted */
return ((our_checksum == notice->z_checksum) ? ZAUTH_YES : ZAUTH_FAILED);
#else
return (notice->z_auth ? ZAUTH_YES : ZAUTH_NO);
#endif
}
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