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freebsd/sys/kern/kern_acl.c
Robert Watson c86ca022eb Introduce support for Mandatory Access Control and extensible 
kernel access control.

Instrument the kernel ACL retrieval and modification system calls
to invoke MAC framework entry points to authorize these operations.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs
2002-08-01 01:04:16 +00:00

858 lines
21 KiB
C
Raw Blame History

/*-
* Copyright (c) 1999-2001 Robert N. M. Watson
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* 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.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
* Support for POSIX.1e access control lists.
*/
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/kernel.h>
#include <sys/mac.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/sysent.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/acl.h>
MALLOC_DEFINE(M_ACL, "acl", "access control list");
static int vacl_set_acl(struct thread *td, struct vnode *vp,
acl_type_t type, struct acl *aclp);
static int vacl_get_acl(struct thread *td, struct vnode *vp,
acl_type_t type, struct acl *aclp);
static int vacl_aclcheck(struct thread *td, struct vnode *vp,
acl_type_t type, struct acl *aclp);
/*
* Implement a version of vaccess() that understands POSIX.1e ACL semantics.
* Return 0 on success, else an errno value. Should be merged into
* vaccess() eventually.
*/
int
vaccess_acl_posix1e(enum vtype type, uid_t file_uid, gid_t file_gid,
struct acl *acl, mode_t acc_mode, struct ucred *cred, int *privused)
{
struct acl_entry *acl_other, *acl_mask;
mode_t dac_granted;
mode_t cap_granted;
mode_t acl_mask_granted;
int group_matched, i;
/*
* Look for a normal, non-privileged way to access the file/directory
* as requested. If it exists, go with that. Otherwise, attempt
* to use privileges granted via cap_granted. In some cases,
* which privileges to use may be ambiguous due to "best match",
* in which case fall back on first match for the time being.
*/
if (privused != NULL)
*privused = 0;
/*
* Determine privileges now, but don't apply until we've found
* a DAC entry that matches but has failed to allow access.
*/
#ifndef CAPABILITIES
if (suser_cred(cred, PRISON_ROOT) == 0)
cap_granted = VALLPERM;
else
cap_granted = 0;
#else
cap_granted = 0;
if (type == VDIR) {
if ((acc_mode & VEXEC) && !cap_check(cred, NULL,
CAP_DAC_READ_SEARCH, PRISON_ROOT))
cap_granted |= VEXEC;
} else {
if ((acc_mode & VEXEC) && !cap_check(cred, NULL,
CAP_DAC_EXECUTE, PRISON_ROOT))
cap_granted |= VEXEC;
}
if ((acc_mode & VREAD) && !cap_check(cred, NULL, CAP_DAC_READ_SEARCH,
PRISON_ROOT))
cap_granted |= VREAD;
if (((acc_mode & VWRITE) || (acc_mode & VAPPEND)) &&
!cap_check(cred, NULL, CAP_DAC_WRITE, PRISON_ROOT))
cap_granted |= (VWRITE | VAPPEND);
if ((acc_mode & VADMIN) && !cap_check(cred, NULL, CAP_FOWNER,
PRISON_ROOT))
cap_granted |= VADMIN;
#endif /* CAPABILITIES */
/*
* The owner matches if the effective uid associated with the
* credential matches that of the ACL_USER_OBJ entry. While we're
* doing the first scan, also cache the location of the ACL_MASK
* and ACL_OTHER entries, preventing some future iterations.
*/
acl_mask = acl_other = NULL;
for (i = 0; i < acl->acl_cnt; i++) {
switch (acl->acl_entry[i].ae_tag) {
case ACL_USER_OBJ:
if (file_uid != cred->cr_uid)
break;
dac_granted = 0;
dac_granted |= VADMIN;
if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
dac_granted |= VEXEC;
if (acl->acl_entry[i].ae_perm & ACL_READ)
dac_granted |= VREAD;
if (acl->acl_entry[i].ae_perm & ACL_WRITE)
dac_granted |= (VWRITE | VAPPEND);
if ((acc_mode & dac_granted) == acc_mode)
return (0);
if ((acc_mode & (dac_granted | cap_granted)) ==
acc_mode) {
if (privused != NULL)
*privused = 1;
return (0);
}
goto error;
case ACL_MASK:
acl_mask = &acl->acl_entry[i];
break;
case ACL_OTHER:
acl_other = &acl->acl_entry[i];
break;
default:
break;
}
}
/*
* An ACL_OTHER entry should always exist in a valid access
* ACL. If it doesn't, then generate a serious failure. For now,
* this means a debugging message and EPERM, but in the future
* should probably be a panic.
*/
if (acl_other == NULL) {
/*
* XXX This should never happen
*/
printf("vaccess_acl_posix1e: ACL_OTHER missing\n");
return (EPERM);
}
/*
* Checks against ACL_USER, ACL_GROUP_OBJ, and ACL_GROUP fields
* are masked by an ACL_MASK entry, if any. As such, first identify
* the ACL_MASK field, then iterate through identifying potential
* user matches, then group matches. If there is no ACL_MASK,
* assume that the mask allows all requests to succeed.
*/
if (acl_mask != NULL) {
acl_mask_granted = 0;
if (acl_mask->ae_perm & ACL_EXECUTE)
acl_mask_granted |= VEXEC;
if (acl_mask->ae_perm & ACL_READ)
acl_mask_granted |= VREAD;
if (acl_mask->ae_perm & ACL_WRITE)
acl_mask_granted |= (VWRITE | VAPPEND);
} else
acl_mask_granted = VEXEC | VREAD | VWRITE | VAPPEND;
/*
* Iterate through user ACL entries. Do checks twice, first
* without privilege, and then if a match is found but failed,
* a second time with privilege.
*/
/*
* Check ACL_USER ACL entries.
*/
for (i = 0; i < acl->acl_cnt; i++) {
switch (acl->acl_entry[i].ae_tag) {
case ACL_USER:
if (acl->acl_entry[i].ae_id != cred->cr_uid)
break;
dac_granted = 0;
if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
dac_granted |= VEXEC;
if (acl->acl_entry[i].ae_perm & ACL_READ)
dac_granted |= VREAD;
if (acl->acl_entry[i].ae_perm & ACL_WRITE)
dac_granted |= (VWRITE | VAPPEND);
dac_granted &= acl_mask_granted;
if ((acc_mode & dac_granted) == acc_mode)
return (0);
if ((acc_mode & (dac_granted | cap_granted)) !=
acc_mode)
goto error;
if (privused != NULL)
*privused = 1;
return (0);
}
}
/*
* Group match is best-match, not first-match, so find a
* "best" match. Iterate across, testing each potential group
* match. Make sure we keep track of whether we found a match
* or not, so that we know if we should try again with any
* available privilege, or if we should move on to ACL_OTHER.
*/
group_matched = 0;
for (i = 0; i < acl->acl_cnt; i++) {
switch (acl->acl_entry[i].ae_tag) {
case ACL_GROUP_OBJ:
if (!groupmember(file_gid, cred))
break;
dac_granted = 0;
if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
dac_granted |= VEXEC;
if (acl->acl_entry[i].ae_perm & ACL_READ)
dac_granted |= VREAD;
if (acl->acl_entry[i].ae_perm & ACL_WRITE)
dac_granted |= (VWRITE | VAPPEND);
dac_granted &= acl_mask_granted;
if ((acc_mode & dac_granted) == acc_mode)
return (0);
group_matched = 1;
break;
case ACL_GROUP:
if (!groupmember(acl->acl_entry[i].ae_id, cred))
break;
dac_granted = 0;
if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
dac_granted |= VEXEC;
if (acl->acl_entry[i].ae_perm & ACL_READ)
dac_granted |= VREAD;
if (acl->acl_entry[i].ae_perm & ACL_WRITE)
dac_granted |= (VWRITE | VAPPEND);
dac_granted &= acl_mask_granted;
if ((acc_mode & dac_granted) == acc_mode)
return (0);
group_matched = 1;
break;
default:
break;
}
}
if (group_matched == 1) {
/*
* There was a match, but it did not grant rights via
* pure DAC. Try again, this time with privilege.
*/
for (i = 0; i < acl->acl_cnt; i++) {
switch (acl->acl_entry[i].ae_tag) {
case ACL_GROUP_OBJ:
if (!groupmember(file_gid, cred))
break;
dac_granted = 0;
if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
dac_granted |= VEXEC;
if (acl->acl_entry[i].ae_perm & ACL_READ)
dac_granted |= VREAD;
if (acl->acl_entry[i].ae_perm & ACL_WRITE)
dac_granted |= (VWRITE | VAPPEND);
dac_granted &= acl_mask_granted;
if ((acc_mode & (dac_granted | cap_granted)) !=
acc_mode)
break;
if (privused != NULL)
*privused = 1;
return (0);
case ACL_GROUP:
if (!groupmember(acl->acl_entry[i].ae_id,
cred))
break;
dac_granted = 0;
if (acl->acl_entry[i].ae_perm & ACL_EXECUTE)
dac_granted |= VEXEC;
if (acl->acl_entry[i].ae_perm & ACL_READ)
dac_granted |= VREAD;
if (acl->acl_entry[i].ae_perm & ACL_WRITE)
dac_granted |= (VWRITE | VAPPEND);
dac_granted &= acl_mask_granted;
if ((acc_mode & (dac_granted | cap_granted)) !=
acc_mode)
break;
if (privused != NULL)
*privused = 1;
return (0);
default:
break;
}
}
/*
* Even with privilege, group membership was not sufficient.
* Return failure.
*/
goto error;
}
/*
* Fall back on ACL_OTHER. ACL_MASK is not applied to ACL_OTHER.
*/
dac_granted = 0;
if (acl_other->ae_perm & ACL_EXECUTE)
dac_granted |= VEXEC;
if (acl_other->ae_perm & ACL_READ)
dac_granted |= VREAD;
if (acl_other->ae_perm & ACL_WRITE)
dac_granted |= (VWRITE | VAPPEND);
if ((acc_mode & dac_granted) == acc_mode)
return (0);
if ((acc_mode & (dac_granted | cap_granted)) == acc_mode) {
if (privused != NULL)
*privused = 1;
return (0);
}
error:
return ((acc_mode & VADMIN) ? EPERM : EACCES);
}
/*
* For the purposes of filesystems maintaining the _OBJ entries in an
* inode with a mode_t field, this routine converts a mode_t entry
* to an acl_perm_t.
*/
acl_perm_t
acl_posix1e_mode_to_perm(acl_tag_t tag, mode_t mode)
{
acl_perm_t perm = 0;
switch(tag) {
case ACL_USER_OBJ:
if (mode & S_IXUSR)
perm |= ACL_EXECUTE;
if (mode & S_IRUSR)
perm |= ACL_READ;
if (mode & S_IWUSR)
perm |= ACL_WRITE;
return (perm);
case ACL_GROUP_OBJ:
if (mode & S_IXGRP)
perm |= ACL_EXECUTE;
if (mode & S_IRGRP)
perm |= ACL_READ;
if (mode & S_IWGRP)
perm |= ACL_WRITE;
return (perm);
case ACL_OTHER:
if (mode & S_IXOTH)
perm |= ACL_EXECUTE;
if (mode & S_IROTH)
perm |= ACL_READ;
if (mode & S_IWOTH)
perm |= ACL_WRITE;
return (perm);
default:
printf("acl_posix1e_mode_to_perm: invalid tag (%d)\n", tag);
return (0);
}
}
/*
* Given inode information (uid, gid, mode), return an acl entry of the
* appropriate type.
*/
struct acl_entry
acl_posix1e_mode_to_entry(acl_tag_t tag, uid_t uid, gid_t gid, mode_t mode)
{
struct acl_entry acl_entry;
acl_entry.ae_tag = tag;
acl_entry.ae_perm = acl_posix1e_mode_to_perm(tag, mode);
switch(tag) {
case ACL_USER_OBJ:
acl_entry.ae_id = uid;
break;
case ACL_GROUP_OBJ:
acl_entry.ae_id = gid;
break;
case ACL_OTHER:
acl_entry.ae_id = ACL_UNDEFINED_ID;
break;
default:
acl_entry.ae_id = ACL_UNDEFINED_ID;
printf("acl_posix1e_mode_to_entry: invalid tag (%d)\n", tag);
}
return (acl_entry);
}
/*
* Utility function to generate a file mode given appropriate ACL entries.
*/
mode_t
acl_posix1e_perms_to_mode(struct acl_entry *acl_user_obj_entry,
struct acl_entry *acl_group_obj_entry, struct acl_entry *acl_other_entry)
{
mode_t mode;
mode = 0;
if (acl_user_obj_entry->ae_perm & ACL_EXECUTE)
mode |= S_IXUSR;
if (acl_user_obj_entry->ae_perm & ACL_READ)
mode |= S_IRUSR;
if (acl_user_obj_entry->ae_perm & ACL_WRITE)
mode |= S_IWUSR;
if (acl_group_obj_entry->ae_perm & ACL_EXECUTE)
mode |= S_IXGRP;
if (acl_group_obj_entry->ae_perm & ACL_READ)
mode |= S_IRGRP;
if (acl_group_obj_entry->ae_perm & ACL_WRITE)
mode |= S_IWGRP;
if (acl_other_entry->ae_perm & ACL_EXECUTE)
mode |= S_IXOTH;
if (acl_other_entry->ae_perm & ACL_READ)
mode |= S_IROTH;
if (acl_other_entry->ae_perm & ACL_WRITE)
mode |= S_IWOTH;
return (mode);
}
/*
* Perform a syntactic check of the ACL, sufficient to allow an
* implementing filesystem to determine if it should accept this and
* rely on the POSIX.1e ACL properties.
*/
int
acl_posix1e_check(struct acl *acl)
{
int num_acl_user_obj, num_acl_user, num_acl_group_obj, num_acl_group;
int num_acl_mask, num_acl_other, i;
/*
* Verify that the number of entries does not exceed the maximum
* defined for acl_t.
* Verify that the correct number of various sorts of ae_tags are
* present:
* Exactly one ACL_USER_OBJ
* Exactly one ACL_GROUP_OBJ
* Exactly one ACL_OTHER
* If any ACL_USER or ACL_GROUP entries appear, then exactly one
* ACL_MASK entry must also appear.
* Verify that all ae_perm entries are in ACL_PERM_BITS.
* Verify all ae_tag entries are understood by this implementation.
* Note: Does not check for uniqueness of qualifier (ae_id) field.
*/
num_acl_user_obj = num_acl_user = num_acl_group_obj = num_acl_group =
num_acl_mask = num_acl_other = 0;
if (acl->acl_cnt > ACL_MAX_ENTRIES || acl->acl_cnt < 0)
return (EINVAL);
for (i = 0; i < acl->acl_cnt; i++) {
/*
* Check for a valid tag.
*/
switch(acl->acl_entry[i].ae_tag) {
case ACL_USER_OBJ:
acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
return (EINVAL);
num_acl_user_obj++;
break;
case ACL_GROUP_OBJ:
acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
return (EINVAL);
num_acl_group_obj++;
break;
case ACL_USER:
if (acl->acl_entry[i].ae_id == ACL_UNDEFINED_ID)
return (EINVAL);
num_acl_user++;
break;
case ACL_GROUP:
if (acl->acl_entry[i].ae_id == ACL_UNDEFINED_ID)
return (EINVAL);
num_acl_group++;
break;
case ACL_OTHER:
acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
return (EINVAL);
num_acl_other++;
break;
case ACL_MASK:
acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */
if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID)
return (EINVAL);
num_acl_mask++;
break;
default:
return (EINVAL);
}
/*
* Check for valid perm entries.
*/
if ((acl->acl_entry[i].ae_perm | ACL_PERM_BITS) !=
ACL_PERM_BITS)
return (EINVAL);
}
if ((num_acl_user_obj != 1) || (num_acl_group_obj != 1) ||
(num_acl_other != 1) || (num_acl_mask != 0 && num_acl_mask != 1))
return (EINVAL);
if (((num_acl_group != 0) || (num_acl_user != 0)) &&
(num_acl_mask != 1))
return (EINVAL);
return (0);
}
/*
* These calls wrap the real vnode operations, and are called by the
* syscall code once the syscall has converted the path or file
* descriptor to a vnode (unlocked). The aclp pointer is assumed
* still to point to userland, so this should not be consumed within
* the kernel except by syscall code. Other code should directly
* invoke VOP_{SET,GET}ACL.
*/
/*
* Given a vnode, set its ACL.
*/
static int
vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type,
struct acl *aclp)
{
struct acl inkernacl;
struct mount *mp;
int error;
error = copyin(aclp, &inkernacl, sizeof(struct acl));
if (error)
return(error);
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error != 0)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
#ifdef MAC
error = mac_check_vnode_setacl(td->td_ucred, vp, type, &inkernacl);
if (error != 0)
goto out;
#endif
error = VOP_SETACL(vp, type, &inkernacl, td->td_ucred, td);
#ifdef MAC
out:
#endif
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return(error);
}
/*
* Given a vnode, get its ACL.
*/
static int
vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type,
struct acl *aclp)
{
struct acl inkernelacl;
int error;
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
#ifdef MAC
error = mac_check_vnode_getacl(td->td_ucred, vp, type);
if (error != 0)
goto out;
#endif
error = VOP_GETACL(vp, type, &inkernelacl, td->td_ucred, td);
#ifdef MAC
out:
#endif
VOP_UNLOCK(vp, 0, td);
if (error == 0)
error = copyout(&inkernelacl, aclp, sizeof(struct acl));
return (error);
}
/*
* Given a vnode, delete its ACL.
*/
static int
vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type)
{
struct mount *mp;
int error;
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error)
return (error);
VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
#ifdef MAC
error = mac_check_vnode_deleteacl(td->td_ucred, vp, type);
if (error)
goto out;
#endif
error = VOP_SETACL(vp, type, 0, td->td_ucred, td);
#ifdef MAC
out:
#endif
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
return (error);
}
/*
* Given a vnode, check whether an ACL is appropriate for it
*/
static int
vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type,
struct acl *aclp)
{
struct acl inkernelacl;
int error;
error = copyin(aclp, &inkernelacl, sizeof(struct acl));
if (error)
return(error);
error = VOP_ACLCHECK(vp, type, &inkernelacl, td->td_ucred, td);
return (error);
}
/*
* syscalls -- convert the path/fd to a vnode, and call vacl_whatever.
* Don't need to lock, as the vacl_ code will get/release any locks
* required.
*/
/*
* Given a file path, get an ACL for it
*
* MPSAFE
*/
int
__acl_get_file(struct thread *td, struct __acl_get_file_args *uap)
{
struct nameidata nd;
int error;
mtx_lock(&Giant);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
error = namei(&nd);
if (error == 0) {
error = vacl_get_acl(td, nd.ni_vp, SCARG(uap, type),
SCARG(uap, aclp));
NDFREE(&nd, 0);
}
mtx_unlock(&Giant);
return (error);
}
/*
* Given a file path, set an ACL for it
*
* MPSAFE
*/
int
__acl_set_file(struct thread *td, struct __acl_set_file_args *uap)
{
struct nameidata nd;
int error;
mtx_lock(&Giant);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
error = namei(&nd);
if (error == 0) {
error = vacl_set_acl(td, nd.ni_vp, SCARG(uap, type),
SCARG(uap, aclp));
NDFREE(&nd, 0);
}
mtx_unlock(&Giant);
return (error);
}
/*
* Given a file descriptor, get an ACL for it
*
* MPSAFE
*/
int
__acl_get_fd(struct thread *td, struct __acl_get_fd_args *uap)
{
struct file *fp;
int error;
mtx_lock(&Giant);
error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
if (error == 0) {
error = vacl_get_acl(td, (struct vnode *)fp->f_data,
SCARG(uap, type), SCARG(uap, aclp));
fdrop(fp, td);
}
mtx_unlock(&Giant);
return (error);
}
/*
* Given a file descriptor, set an ACL for it
*
* MPSAFE
*/
int
__acl_set_fd(struct thread *td, struct __acl_set_fd_args *uap)
{
struct file *fp;
int error;
mtx_lock(&Giant);
error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
if (error == 0) {
error = vacl_set_acl(td, (struct vnode *)fp->f_data,
SCARG(uap, type), SCARG(uap, aclp));
fdrop(fp, td);
}
mtx_unlock(&Giant);
return (error);
}
/*
* Given a file path, delete an ACL from it.
*
* MPSAFE
*/
int
__acl_delete_file(struct thread *td, struct __acl_delete_file_args *uap)
{
struct nameidata nd;
int error;
mtx_lock(&Giant);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
error = namei(&nd);
if (error == 0) {
error = vacl_delete(td, nd.ni_vp, SCARG(uap, type));
NDFREE(&nd, 0);
}
mtx_unlock(&Giant);
return (error);
}
/*
* Given a file path, delete an ACL from it.
*
* MPSAFE
*/
int
__acl_delete_fd(struct thread *td, struct __acl_delete_fd_args *uap)
{
struct file *fp;
int error;
mtx_lock(&Giant);
error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
if (error == 0) {
error = vacl_delete(td, (struct vnode *)fp->f_data,
SCARG(uap, type));
fdrop(fp, td);
}
mtx_unlock(&Giant);
return (error);
}
/*
* Given a file path, check an ACL for it
*
* MPSAFE
*/
int
__acl_aclcheck_file(struct thread *td, struct __acl_aclcheck_file_args *uap)
{
struct nameidata nd;
int error;
mtx_lock(&Giant);
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td);
error = namei(&nd);
if (error == 0) {
error = vacl_aclcheck(td, nd.ni_vp, SCARG(uap, type),
SCARG(uap, aclp));
NDFREE(&nd, 0);
}
mtx_unlock(&Giant);
return (error);
}
/*
* Given a file descriptor, check an ACL for it
*
* MPSAFE
*/
int
__acl_aclcheck_fd(struct thread *td, struct __acl_aclcheck_fd_args *uap)
{
struct file *fp;
int error;
mtx_lock(&Giant);
error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
if (error == 0) {
error = vacl_aclcheck(td, (struct vnode *)fp->f_data,
SCARG(uap, type), SCARG(uap, aclp));
fdrop(fp, td);
}
mtx_unlock(&Giant);
return (error);
}
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