mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
e4256d1e8d
subr_acl_posix1e.c, leaving kern_acl.c containing only ACL system calls and utility routines common across ACL types. Add subr_acl_posix1e.c to the build. Obtained from: TrustedBSD Project
457 lines
11 KiB
C
457 lines
11 KiB
C
/*-
|
|
* Copyright (c) 1999-2006 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.
|
|
*/
|
|
/*
|
|
* Developed by the TrustedBSD Project.
|
|
*
|
|
* ACL system calls and other functions common across different ACL types.
|
|
* Type-specific routines go into subr_acl_<type>.c.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#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/mount.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/file.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/acl.h>
|
|
|
|
#include <vm/uma.h>
|
|
|
|
uma_zone_t acl_zone;
|
|
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);
|
|
|
|
/*
|
|
* 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 vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file path, get an ACL for it; don't follow links.
|
|
*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
__acl_get_link(struct thread *td, struct __acl_get_link_args *uap)
|
|
{
|
|
struct nameidata nd;
|
|
int vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
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 vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file path, set an ACL for it; don't follow links.
|
|
*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
__acl_set_link(struct thread *td, struct __acl_set_link_args *uap)
|
|
{
|
|
struct nameidata nd;
|
|
int vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
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 vfslocked, error;
|
|
|
|
error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
|
|
if (error == 0) {
|
|
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
|
|
error = vacl_get_acl(td, fp->f_vnode, uap->type, uap->aclp);
|
|
fdrop(fp, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
}
|
|
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 vfslocked, error;
|
|
|
|
error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
|
|
if (error == 0) {
|
|
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
|
|
error = vacl_set_acl(td, fp->f_vnode, uap->type, uap->aclp);
|
|
fdrop(fp, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
}
|
|
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 vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_delete(td, nd.ni_vp, uap->type);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file path, delete an ACL from it; don't follow links.
|
|
*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
__acl_delete_link(struct thread *td, struct __acl_delete_link_args *uap)
|
|
{
|
|
struct nameidata nd;
|
|
int vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_delete(td, nd.ni_vp, uap->type);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
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 vfslocked, error;
|
|
|
|
error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
|
|
if (error == 0) {
|
|
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
|
|
error = vacl_delete(td, fp->f_vnode, uap->type);
|
|
fdrop(fp, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
}
|
|
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 vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Given a file path, check an ACL for it; don't follow links.
|
|
*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
__acl_aclcheck_link(struct thread *td, struct __acl_aclcheck_link_args *uap)
|
|
{
|
|
struct nameidata nd;
|
|
int vfslocked, error;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
|
|
NDFREE(&nd, 0);
|
|
}
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
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 vfslocked, error;
|
|
|
|
error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
|
|
if (error == 0) {
|
|
vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
|
|
error = vacl_aclcheck(td, fp->f_vnode, uap->type, uap->aclp);
|
|
fdrop(fp, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/* ARGUSED */
|
|
|
|
static void
|
|
aclinit(void *dummy __unused)
|
|
{
|
|
|
|
acl_zone = uma_zcreate("ACL UMA zone", sizeof(struct acl),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
}
|
|
SYSINIT(acls, SI_SUB_ACL, SI_ORDER_FIRST, aclinit, NULL)
|