2 * Copyright (c) 1999-2006 Robert N. M. Watson
5 * This software was developed by Robert Watson for the TrustedBSD Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * Developed by the TrustedBSD Project.
31 * ACL system calls and other functions common across different ACL types.
32 * Type-specific routines go into subr_acl_<type>.c.
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/sysproto.h>
43 #include <sys/fcntl.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
46 #include <sys/mount.h>
47 #include <sys/vnode.h>
49 #include <sys/mutex.h>
50 #include <sys/namei.h>
52 #include <sys/filedesc.h>
54 #include <sys/sysent.h>
57 #include <security/mac/mac_framework.h>
62 static int vacl_set_acl(struct thread *td, struct vnode *vp,
63 acl_type_t type, struct acl *aclp);
64 static int vacl_get_acl(struct thread *td, struct vnode *vp,
65 acl_type_t type, struct acl *aclp);
66 static int vacl_aclcheck(struct thread *td, struct vnode *vp,
67 acl_type_t type, struct acl *aclp);
70 * These calls wrap the real vnode operations, and are called by the syscall
71 * code once the syscall has converted the path or file descriptor to a vnode
72 * (unlocked). The aclp pointer is assumed still to point to userland, so
73 * this should not be consumed within the kernel except by syscall code.
74 * Other code should directly invoke VOP_{SET,GET}ACL.
78 * Given a vnode, set its ACL.
81 vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type,
88 error = copyin(aclp, &inkernacl, sizeof(struct acl));
91 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
94 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
95 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
97 error = mac_vnode_check_setacl(td->td_ucred, vp, type, &inkernacl);
101 error = VOP_SETACL(vp, type, &inkernacl, td->td_ucred, td);
106 vn_finished_write(mp);
111 * Given a vnode, get its ACL.
114 vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type,
117 struct acl inkernelacl;
120 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
121 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
123 error = mac_vnode_check_getacl(td->td_ucred, vp, type);
127 error = VOP_GETACL(vp, type, &inkernelacl, td->td_ucred, td);
133 error = copyout(&inkernelacl, aclp, sizeof(struct acl));
138 * Given a vnode, delete its ACL.
141 vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type)
146 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
149 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
150 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
152 error = mac_vnode_check_deleteacl(td->td_ucred, vp, type);
156 error = VOP_SETACL(vp, type, 0, td->td_ucred, td);
161 vn_finished_write(mp);
166 * Given a vnode, check whether an ACL is appropriate for it
169 vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type,
172 struct acl inkernelacl;
175 error = copyin(aclp, &inkernelacl, sizeof(struct acl));
178 error = VOP_ACLCHECK(vp, type, &inkernelacl, td->td_ucred, td);
183 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever. Don't
184 * need to lock, as the vacl_ code will get/release any locks required.
188 * Given a file path, get an ACL for it
191 __acl_get_file(struct thread *td, struct __acl_get_file_args *uap)
194 int vfslocked, error;
196 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
198 vfslocked = NDHASGIANT(&nd);
200 error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
203 VFS_UNLOCK_GIANT(vfslocked);
208 * Given a file path, get an ACL for it; don't follow links.
211 __acl_get_link(struct thread *td, struct __acl_get_link_args *uap)
214 int vfslocked, error;
216 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
218 vfslocked = NDHASGIANT(&nd);
220 error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
223 VFS_UNLOCK_GIANT(vfslocked);
228 * Given a file path, set an ACL for it.
231 __acl_set_file(struct thread *td, struct __acl_set_file_args *uap)
234 int vfslocked, error;
236 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
238 vfslocked = NDHASGIANT(&nd);
240 error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
243 VFS_UNLOCK_GIANT(vfslocked);
248 * Given a file path, set an ACL for it; don't follow links.
251 __acl_set_link(struct thread *td, struct __acl_set_link_args *uap)
254 int vfslocked, error;
256 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
258 vfslocked = NDHASGIANT(&nd);
260 error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
263 VFS_UNLOCK_GIANT(vfslocked);
268 * Given a file descriptor, get an ACL for it.
271 __acl_get_fd(struct thread *td, struct __acl_get_fd_args *uap)
274 int vfslocked, error;
276 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
278 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
279 error = vacl_get_acl(td, fp->f_vnode, uap->type, uap->aclp);
281 VFS_UNLOCK_GIANT(vfslocked);
287 * Given a file descriptor, set an ACL for it.
290 __acl_set_fd(struct thread *td, struct __acl_set_fd_args *uap)
293 int vfslocked, error;
295 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
297 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
298 error = vacl_set_acl(td, fp->f_vnode, uap->type, uap->aclp);
300 VFS_UNLOCK_GIANT(vfslocked);
306 * Given a file path, delete an ACL from it.
309 __acl_delete_file(struct thread *td, struct __acl_delete_file_args *uap)
312 int vfslocked, error;
314 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
316 vfslocked = NDHASGIANT(&nd);
318 error = vacl_delete(td, nd.ni_vp, uap->type);
321 VFS_UNLOCK_GIANT(vfslocked);
326 * Given a file path, delete an ACL from it; don't follow links.
329 __acl_delete_link(struct thread *td, struct __acl_delete_link_args *uap)
332 int vfslocked, error;
334 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
336 vfslocked = NDHASGIANT(&nd);
338 error = vacl_delete(td, nd.ni_vp, uap->type);
341 VFS_UNLOCK_GIANT(vfslocked);
346 * Given a file path, delete an ACL from it.
349 __acl_delete_fd(struct thread *td, struct __acl_delete_fd_args *uap)
352 int vfslocked, error;
354 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
356 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
357 error = vacl_delete(td, fp->f_vnode, uap->type);
359 VFS_UNLOCK_GIANT(vfslocked);
365 * Given a file path, check an ACL for it.
368 __acl_aclcheck_file(struct thread *td, struct __acl_aclcheck_file_args *uap)
371 int vfslocked, error;
373 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
375 vfslocked = NDHASGIANT(&nd);
377 error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
380 VFS_UNLOCK_GIANT(vfslocked);
385 * Given a file path, check an ACL for it; don't follow links.
388 __acl_aclcheck_link(struct thread *td, struct __acl_aclcheck_link_args *uap)
391 int vfslocked, error;
393 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
395 vfslocked = NDHASGIANT(&nd);
397 error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
400 VFS_UNLOCK_GIANT(vfslocked);
405 * Given a file descriptor, check an ACL for it.
408 __acl_aclcheck_fd(struct thread *td, struct __acl_aclcheck_fd_args *uap)
411 int vfslocked, error;
413 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
415 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
416 error = vacl_aclcheck(td, fp->f_vnode, uap->type, uap->aclp);
418 VFS_UNLOCK_GIANT(vfslocked);
426 aclinit(void *dummy __unused)
429 acl_zone = uma_zcreate("ACL UMA zone", sizeof(struct acl),
430 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
432 SYSINIT(acls, SI_SUB_ACL, SI_ORDER_FIRST, aclinit, NULL);