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freebsd/sys/kgssapi/gss_pname_to_uid.c
Rick Macklem 13870d5d7b Piete.Brooks at cl.cam.ac.uk reported via email a crash which was
caused by use of an invalid kgss_gssd_handle during an upcall to
the gssd daemon when it has exited. This patch seems to avoid the
crashes by holding a reference count on the kgss_gssd_handle until
the upcall is done. It also adds a new mutex kgss_gssd_lock used to
make manipulation of kgss_gssd_handle SMP safe.

Tested by:	Illias A. Marinos, Herbert Poeckl
Reviewed by:	jhb
MFC after:	2 weeks
2012-12-18 00:25:48 +00:00

131 lines
3.4 KiB
C

/*-
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
#include "kgss_if.h"
OM_uint32
gss_pname_to_uid(OM_uint32 *minor_status, const gss_name_t pname,
const gss_OID mech, uid_t *uidp)
{
struct pname_to_uid_res res;
struct pname_to_uid_args args;
enum clnt_stat stat;
CLIENT *cl;
*minor_status = 0;
if (pname == GSS_C_NO_NAME)
return (GSS_S_BAD_NAME);
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.pname = pname->handle;
args.mech = mech;
bzero(&res, sizeof(res));
stat = gssd_pname_to_uid_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
}
if (res.major_status != GSS_S_COMPLETE) {
*minor_status = res.minor_status;
return (res.major_status);
}
*uidp = res.uid;
return (GSS_S_COMPLETE);
}
OM_uint32
gss_pname_to_unix_cred(OM_uint32 *minor_status, const gss_name_t pname,
const gss_OID mech, uid_t *uidp, gid_t *gidp,
int *numgroups, gid_t *groups)
{
struct pname_to_uid_res res;
struct pname_to_uid_args args;
enum clnt_stat stat;
int i, n;
CLIENT *cl;
*minor_status = 0;
if (pname == GSS_C_NO_NAME)
return (GSS_S_BAD_NAME);
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.pname = pname->handle;
args.mech = mech;
bzero(&res, sizeof(res));
stat = gssd_pname_to_uid_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
}
if (res.major_status != GSS_S_COMPLETE) {
*minor_status = res.minor_status;
return (res.major_status);
}
*uidp = res.uid;
*gidp = res.gid;
n = res.gidlist.gidlist_len;
if (n > *numgroups)
n = *numgroups;
for (i = 0; i < n; i++)
groups[i] = res.gidlist.gidlist_val[i];
*numgroups = n;
xdr_free((xdrproc_t) xdr_pname_to_uid_res, &res);
return (GSS_S_COMPLETE);
}