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src/protocols/zephyr/ZCkAuth.c@cabd145237d8

src/protocols/zephyr/ZCkAuth.c

Thu, 07 Apr 2005 14:55:02 +0000

author

Richard Laager <rlaager@pidgin.im>

date

Thu, 07 Apr 2005 14:55:02 +0000

changeset 10789

cabd145237d8

parent 8791

655f64e6d1e2

child 11105

842fa517e08c

permissions

-rw-r--r--

[gaim-migrate @ 12431]
" The following log snippets should explain it: " --rlaager

(20:24:00) rlaager: Regarding the signal handling
conversation the other day... I've written a patch to stop
calling signal handlers and return as soon as we find one
signal handler that returns TRUE to indicate that it's
handled the signal. Is this the right approach?

(20:24:22) Ethan Blanton (Paco-Paco): the trouble is that it's
documented to behave exactly the way it does
(20:24:31) Ethan Blanton (Paco-Paco): so changing it is
notbackwards compatible
(20:24:31) rlaager: I'm talking for HEAD.
(20:24:41) Ethan Blanton (Paco-Paco): oh, I think that's a
good approach, yes
(20:24:53) rlaager: The way I've described is how I
*expected* it to work, having not read the documentation.
(20:25:09) Ethan Blanton (Paco-Paco): I'm convinced
(20:27:04) Stu Tomlinson (nosnilmot): rlaager: this, I
assume, breaks the generic-ness of signals, by assuming
that any that return values return booleans?
(20:27:26) Ethan Blanton (Paco-Paco): please break it
(20:27:33) Ethan Blanton (Paco-Paco): we already have
out-parameters
(20:27:42) rlaager: nosnilmot: from what I can see, the
return type is handled as a (void *)... so I'm checking that
ret_value != NULL
(20:27:57) rlaager: nosnilmot: that's the correct way to do it,
right?
...
(20:29:01) Ethan Blanton (Paco-Paco): allowing a
meaningful return value is an over-engineering
(20:30:07) rlaager: even after this patch, you should be able
to return meaningful return values
(20:30:15) rlaager: it'll just short-circuit on the first handler
that does

committer: Luke Schierer <lschiere@pidgin.im>

/* This file is part of the Project Athena Zephyr Notification System.
 * It contains source for the ZCheckAuthentication function.
 *
 *	Created by:	Robert French
 *
 *	$Source$
 *	$Author: chipx86 $
 *
 *	Copyright (c) 1987,1991 by the Massachusetts Institute of Technology.
 *	For copying and distribution information, see the file
 *	"mit-copyright.h". 
 */
/* $Header$ */

#ifndef lint
static char rcsid_ZCheckAuthentication_c[] =
    "$Zephyr: /mit/zephyr/src/lib/RCS/ZCheckAuthentication.c,v 1.14 89/03/24 14:17:38 jtkohl Exp Locker: raeburn $";
#endif

#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
}