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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.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/cred.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/pathname.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/mode.h>
#include <sys/uio.h>
#include <sys/kmem.h>
#include <sys/filio.h>
#include <sys/acl.h>
#include <sys/cmn_err.h>
#include <acl/acl_common.h>
#include <sys/unistd.h>
#include <sys/debug.h>
#include <fs/fs_subr.h>
static int cacl(int cmd, int nentries, void *aclbufp,
vnode_t *vp, int *rv);
/*
* Get/Set ACL of a file.
*/
int
acl(const char *fname, int cmd, int nentries, void *aclbufp)
{
struct vnode *vp;
int error;
int rv = 0;
int estale_retry = 0;
/* Sanity check arguments */
if (fname == NULL)
return (set_errno(EINVAL));
lookup:
error = lookupname((char *)fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp);
if (error) {
if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
goto lookup;
return (set_errno(error));
}
error = cacl(cmd, nentries, aclbufp, vp, &rv);
VN_RELE(vp);
if (error) {
if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
goto lookup;
return (set_errno(error));
}
return (rv);
}
/*
* Get/Set ACL of a file with facl system call.
*/
int
facl(int fdes, int cmd, int nentries, void *aclbufp)
{
file_t *fp;
int error;
int rv = 0;
if ((fp = getf(fdes)) == NULL)
return (set_errno(EBADF));
if (fp->f_flag & FREVOKED) {
releasef(fdes);
return (set_errno(EBADF));
}
error = cacl(cmd, nentries, aclbufp, fp->f_vnode, &rv);
releasef(fdes);
if (error)
return (set_errno(error));
return (rv);
}
/*
* Common code for acl() and facl().
*/
static int
cacl(int cmd, int nentries, void *aclbufp, vnode_t *vp, int *rv)
{
int error;
int aclbsize; /* size of acl list in bytes */
int dfaclbsize; /* size of default acl list in bytes */
int numacls;
caddr_t uaddrp;
aclent_t *aclp, *aaclp;
vsecattr_t vsecattr;
size_t entry_size;
ASSERT(vp);
bzero(&vsecattr, sizeof (vsecattr_t));
dfaclbsize = 0;
switch (cmd) {
case ACE_GETACLCNT:
case GETACLCNT:
if (cmd == GETACLCNT) {
entry_size = sizeof (aclent_t);
vsecattr.vsa_mask = VSA_ACLCNT | VSA_DFACLCNT;
} else {
entry_size = sizeof (ace_t);
vsecattr.vsa_mask = VSA_ACECNT;
}
if (error = VOP_GETSECATTR(vp, &vsecattr, 0, CRED(), NULL))
return (error);
*rv = vsecattr.vsa_aclcnt + vsecattr.vsa_dfaclcnt;
if (vsecattr.vsa_aclcnt && vsecattr.vsa_aclentp) {
kmem_free(vsecattr.vsa_aclentp,
vsecattr.vsa_aclcnt * entry_size);
}
if (vsecattr.vsa_dfaclcnt && vsecattr.vsa_dfaclentp) {
kmem_free(vsecattr.vsa_dfaclentp,
vsecattr.vsa_dfaclcnt * entry_size);
}
break;
case GETACL:
/*
* Minimum ACL size is three entries so might as well
* bail out here.
*/
if (nentries < 3)
return (EINVAL);
/*
* NULL output buffer is also a pretty easy bail out.
*/
if (aclbufp == NULL)
return (EFAULT);
vsecattr.vsa_mask = VSA_ACL | VSA_ACLCNT | VSA_DFACL |
VSA_DFACLCNT;
if (error = VOP_GETSECATTR(vp, &vsecattr, 0, CRED(), NULL))
return (error);
/* Check user's buffer is big enough */
numacls = vsecattr.vsa_aclcnt + vsecattr.vsa_dfaclcnt;
aclbsize = vsecattr.vsa_aclcnt * sizeof (aclent_t);
dfaclbsize = vsecattr.vsa_dfaclcnt * sizeof (aclent_t);
if (numacls > nentries) {
error = ENOSPC;
goto errout;
}
/* Sort the acl & default acl lists */
if (vsecattr.vsa_aclcnt > 1)
ksort((caddr_t)vsecattr.vsa_aclentp,
vsecattr.vsa_aclcnt, sizeof (aclent_t), cmp2acls);
if (vsecattr.vsa_dfaclcnt > 1)
ksort((caddr_t)vsecattr.vsa_dfaclentp,
vsecattr.vsa_dfaclcnt, sizeof (aclent_t), cmp2acls);
/* Copy out acl's */
uaddrp = (caddr_t)aclbufp;
if (aclbsize > 0) { /* bug #1262490 */
if (copyout(vsecattr.vsa_aclentp, uaddrp, aclbsize)) {
error = EFAULT;
goto errout;
}
}
/* Copy out default acl's */
if (dfaclbsize > 0) {
uaddrp += aclbsize;
if (copyout(vsecattr.vsa_dfaclentp,
uaddrp, dfaclbsize)) {
error = EFAULT;
goto errout;
}
}
*rv = numacls;
if (vsecattr.vsa_aclcnt) {
kmem_free(vsecattr.vsa_aclentp,
vsecattr.vsa_aclcnt * sizeof (aclent_t));
}
if (vsecattr.vsa_dfaclcnt) {
kmem_free(vsecattr.vsa_dfaclentp,
vsecattr.vsa_dfaclcnt * sizeof (aclent_t));
}
break;
case ACE_GETACL:
if (aclbufp == NULL)
return (EFAULT);
vsecattr.vsa_mask = VSA_ACE | VSA_ACECNT;
if (error = VOP_GETSECATTR(vp, &vsecattr, 0, CRED(), NULL))
return (error);
aclbsize = vsecattr.vsa_aclcnt * sizeof (ace_t);
if (vsecattr.vsa_aclcnt > nentries) {
error = ENOSPC;
goto errout;
}
if (aclbsize > 0) {
if ((error = copyout(vsecattr.vsa_aclentp,
aclbufp, aclbsize)) != 0) {
goto errout;
}
}
*rv = vsecattr.vsa_aclcnt;
if (vsecattr.vsa_aclcnt) {
kmem_free(vsecattr.vsa_aclentp, vsecattr.vsa_aclentsz);
}
break;
case SETACL:
/*
* Minimum ACL size is three entries so might as well
* bail out here. Also limit request size to prevent user
* from allocating too much kernel memory. Maximum size
* is MAX_ACL_ENTRIES for the ACL part and MAX_ACL_ENTRIES
* for the default ACL part. (bug 4058667)
*/
if (nentries < 3 || nentries > (MAX_ACL_ENTRIES * 2))
return (EINVAL);
/*
* NULL output buffer is also an easy bail out.
*/
if (aclbufp == NULL)
return (EFAULT);
vsecattr.vsa_mask = VSA_ACL;
aclbsize = nentries * sizeof (aclent_t);
vsecattr.vsa_aclentp = kmem_alloc(aclbsize, KM_SLEEP);
aaclp = vsecattr.vsa_aclentp;
vsecattr.vsa_aclcnt = nentries;
uaddrp = (caddr_t)aclbufp;
if (copyin(uaddrp, vsecattr.vsa_aclentp, aclbsize)) {
kmem_free(aaclp, aclbsize);
return (EFAULT);
}
/* Sort the acl list */
ksort((caddr_t)vsecattr.vsa_aclentp,
vsecattr.vsa_aclcnt, sizeof (aclent_t), cmp2acls);
/* Break into acl and default acl lists */
for (numacls = 0, aclp = vsecattr.vsa_aclentp;
numacls < vsecattr.vsa_aclcnt;
aclp++, numacls++) {
if (aclp->a_type & ACL_DEFAULT)
break;
}
/* Find where defaults start (if any) */
if (numacls < vsecattr.vsa_aclcnt) {
vsecattr.vsa_mask |= VSA_DFACL;
vsecattr.vsa_dfaclcnt = nentries - numacls;
vsecattr.vsa_dfaclentp = aclp;
vsecattr.vsa_aclcnt = numacls;
}
/* Adjust if they're all defaults */
if (vsecattr.vsa_aclcnt == 0) {
vsecattr.vsa_mask &= ~VSA_ACL;
vsecattr.vsa_aclentp = NULL;
}
/* Only directories can have defaults */
if (vsecattr.vsa_dfaclcnt && vp->v_type != VDIR) {
kmem_free(aaclp, aclbsize);
return (ENOTDIR);
}
(void) VOP_RWLOCK(vp, V_WRITELOCK_TRUE, NULL);
if (error = VOP_SETSECATTR(vp, &vsecattr, 0, CRED(), NULL)) {
kmem_free(aaclp, aclbsize);
VOP_RWUNLOCK(vp, V_WRITELOCK_TRUE, NULL);
return (error);
}
/*
* Should return 0 upon success according to the man page
* and SVR4 semantics. (Bug #1214399: SETACL returns wrong rc)
*/
*rv = 0;
kmem_free(aaclp, aclbsize);
VOP_RWUNLOCK(vp, V_WRITELOCK_TRUE, NULL);
break;
case ACE_SETACL:
if (nentries < 1 || nentries > MAX_ACL_ENTRIES)
return (EINVAL);
if (aclbufp == NULL)
return (EFAULT);
vsecattr.vsa_mask = VSA_ACE;
aclbsize = nentries * sizeof (ace_t);
vsecattr.vsa_aclentp = kmem_alloc(aclbsize, KM_SLEEP);
aaclp = vsecattr.vsa_aclentp;
vsecattr.vsa_aclcnt = nentries;
vsecattr.vsa_aclentsz = aclbsize;
uaddrp = (caddr_t)aclbufp;
if (copyin(uaddrp, vsecattr.vsa_aclentp, aclbsize)) {
kmem_free(aaclp, aclbsize);
return (EFAULT);
}
(void) VOP_RWLOCK(vp, V_WRITELOCK_TRUE, NULL);
if (error = VOP_SETSECATTR(vp, &vsecattr, 0, CRED(), NULL)) {
kmem_free(aaclp, aclbsize);
VOP_RWUNLOCK(vp, V_WRITELOCK_TRUE, NULL);
return (error);
}
*rv = 0;
kmem_free(aaclp, aclbsize);
VOP_RWUNLOCK(vp, V_WRITELOCK_TRUE, NULL);
break;
default:
return (EINVAL);
}
return (0);
errout:
if (aclbsize && vsecattr.vsa_aclentp)
kmem_free(vsecattr.vsa_aclentp, aclbsize);
if (dfaclbsize && vsecattr.vsa_dfaclentp)
kmem_free(vsecattr.vsa_dfaclentp, dfaclbsize);
return (error);
}
|
