2 * Copyright (c) 1999, 2000 Robert N. M. Watson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/kern/kern_acl.c,v 1.2.2.1 2000/07/28 18:48:16 rwatson Exp $
27 * $DragonFly: src/sys/kern/kern_acl.c,v 1.17 2007/02/19 00:51:54 swildner Exp $
31 * Generic routines to support file system ACLs, at a syntactic level
32 * Semantics are the responsibility of the underlying file system
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/sysproto.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
40 #include <sys/vnode.h>
43 #include <sys/nlookup.h>
45 #include <sys/sysent.h>
46 #include <sys/errno.h>
50 #include <sys/mplock2.h>
52 static int vacl_set_acl(struct vnode
*vp
, acl_type_t type
, struct acl
*aclp
);
53 static int vacl_get_acl(struct vnode
*vp
, acl_type_t type
, struct acl
*aclp
);
54 static int vacl_aclcheck(struct vnode
*vp
, acl_type_t type
, struct acl
*aclp
);
57 * These calls wrap the real vnode operations, and are called by the
58 * syscall code once the syscall has converted the path or file
59 * descriptor to a vnode (unlocked). The aclp pointer is assumed
60 * still to point to userland, so this should not be consumed within
61 * the kernel except by syscall code. Other code should directly
62 * invoke VOP_{SET,GET}ACL.
66 * Given a vnode, set its ACL.
69 vacl_set_acl(struct vnode
*vp
, acl_type_t type
, struct acl
*aclp
)
71 struct thread
*td
= curthread
;
76 error
= copyin(aclp
, &inkernacl
, sizeof(struct acl
));
81 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
82 error
= VOP_SETACL(vp
, type
, &inkernacl
, ucred
);
88 * Given a vnode, get its ACL.
91 vacl_get_acl(struct vnode
*vp
, acl_type_t type
, struct acl
*aclp
)
93 struct thread
*td
= curthread
;
94 struct acl inkernelacl
;
99 error
= VOP_GETACL(vp
, type
, &inkernelacl
, ucred
);
101 error
= copyout(&inkernelacl
, aclp
, sizeof(struct acl
));
106 * Given a vnode, delete its ACL.
109 vacl_delete(struct vnode
*vp
, acl_type_t type
)
111 struct thread
*td
= curthread
;
115 ucred
= td
->td_ucred
;
116 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
117 error
= VOP_SETACL(vp
, ACL_TYPE_DEFAULT
, 0, ucred
);
123 * Given a vnode, check whether an ACL is appropriate for it
126 vacl_aclcheck(struct vnode
*vp
, acl_type_t type
, struct acl
*aclp
)
128 struct thread
*td
= curthread
;
130 struct acl inkernelacl
;
133 ucred
= td
->td_ucred
;
134 error
= copyin(aclp
, &inkernelacl
, sizeof(struct acl
));
137 error
= VOP_ACLCHECK(vp
, type
, &inkernelacl
, ucred
);
142 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever.
143 * Don't need to lock, as the vacl_ code will get/release any locks
148 * Given a file path, get an ACL for it
151 sys___acl_get_file(struct __acl_get_file_args
*uap
)
153 struct nlookupdata nd
;
158 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
160 error
= nlookup(&nd
);
162 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
165 error
= vacl_get_acl(vp
, uap
->type
, uap
->aclp
);
172 * Given a file path, set an ACL for it
175 sys___acl_set_file(struct __acl_set_file_args
*uap
)
177 struct nlookupdata nd
;
182 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
184 error
= nlookup(&nd
);
186 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
189 error
= vacl_set_acl(vp
, uap
->type
, uap
->aclp
);
196 * Given a file descriptor, get an ACL for it
199 sys___acl_get_fd(struct __acl_get_fd_args
*uap
)
201 struct thread
*td
= curthread
;
205 KKASSERT(td
->td_proc
);
206 if ((error
= holdvnode(td
->td_proc
->p_fd
, uap
->filedes
, &fp
)) != 0)
208 error
= vacl_get_acl((struct vnode
*)fp
->f_data
, uap
->type
, uap
->aclp
);
215 * Given a file descriptor, set an ACL for it
218 sys___acl_set_fd(struct __acl_set_fd_args
*uap
)
220 struct thread
*td
= curthread
;
224 KKASSERT(td
->td_proc
);
225 if ((error
= holdvnode(td
->td_proc
->p_fd
, uap
->filedes
, &fp
)) != 0)
227 error
= vacl_set_acl((struct vnode
*)fp
->f_data
, uap
->type
, uap
->aclp
);
233 * Given a file path, delete an ACL from it.
236 sys___acl_delete_file(struct __acl_delete_file_args
*uap
)
238 struct nlookupdata nd
;
243 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
245 error
= nlookup(&nd
);
247 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
251 error
= vacl_delete(vp
, uap
->type
);
258 * Given a file path, delete an ACL from it.
261 sys___acl_delete_fd(struct __acl_delete_fd_args
*uap
)
263 struct thread
*td
= curthread
;
267 KKASSERT(td
->td_proc
);
268 if ((error
= holdvnode(td
->td_proc
->p_fd
, uap
->filedes
, &fp
)) != 0)
270 error
= vacl_delete((struct vnode
*)fp
->f_data
, uap
->type
);
276 * Given a file path, check an ACL for it
279 sys___acl_aclcheck_file(struct __acl_aclcheck_file_args
*uap
)
281 struct nlookupdata nd
;
286 error
= nlookup_init(&nd
, uap
->path
, UIO_USERSPACE
, NLC_FOLLOW
);
288 error
= nlookup(&nd
);
290 error
= cache_vref(&nd
.nl_nch
, nd
.nl_cred
, &vp
);
294 error
= vacl_aclcheck(vp
, uap
->type
, uap
->aclp
);
301 * Given a file descriptor, check an ACL for it
304 sys___acl_aclcheck_fd(struct __acl_aclcheck_fd_args
*uap
)
306 struct thread
*td
= curthread
;
310 KKASSERT(td
->td_proc
);
311 if ((error
= holdvnode(td
->td_proc
->p_fd
, uap
->filedes
, &fp
)) != 0)
313 error
= vacl_aclcheck((struct vnode
*)fp
->f_data
, uap
->type
, uap
->aclp
);