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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <unistd.h>
#include <dlfcn.h>
#include "k5-int.h"
#define KRB5_UID "app_krb5_user_uid"
/*
* mech_krb5 makes various calls to getuid(). When employed by gssd(8) and
* ktkt_warnd(8), app_krb5_user_uid() is used to select a given user's
* credential cache, rather than the id of the process.
*/
uid_t
krb5_getuid()
{
static uid_t (*gptr)() = NULL;
void *handle;
if (gptr == NULL) {
/*
* Specifically look for app_krb5_user_uid() in the application,
* and don't fall into an exhaustive search through all of the
* process dependencies. This interface is suplied from
* gssd(8) and ktkt_warnd(8).
*/
if (((handle = dlopen(0, (RTLD_LAZY | RTLD_FIRST))) == NULL) ||
((gptr = (uid_t (*)())dlsym(handle, KRB5_UID)) == NULL)) {
/*
* Fall back to the default getuid(), which is probably
* libc.
*/
gptr = &getuid;
}
}
/*
* Return the appropriate uid. Note, if a default getuid() couldn't
* be found, the getuid assignment would have failed to relocate, and
* hence this module would fail to load.
*/
return ((*gptr)());
}
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