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/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/mount.h>
46 #include <sys/vnode.h>
48 #include <sys/mutex.h>
49 #include <sys/namei.h>
51 #include <sys/filedesc.h>
53 #include <sys/sysent.h>
56 #include <security/mac/mac_framework.h>
61 static int vacl_set_acl(struct thread *td, struct vnode *vp,
62 acl_type_t type, struct acl *aclp);
63 static int vacl_get_acl(struct thread *td, struct vnode *vp,
64 acl_type_t type, struct acl *aclp);
65 static int vacl_aclcheck(struct thread *td, struct vnode *vp,
66 acl_type_t type, struct acl *aclp);
69 * These calls wrap the real vnode operations, and are called by the syscall
70 * code once the syscall has converted the path or file descriptor to a vnode
71 * (unlocked). The aclp pointer is assumed still to point to userland, so
72 * this should not be consumed within the kernel except by syscall code.
73 * Other code should directly invoke VOP_{SET,GET}ACL.
77 * Given a vnode, set its ACL.
80 vacl_set_acl(struct thread *td, struct vnode *vp, acl_type_t type,
87 error = copyin(aclp, &inkernacl, sizeof(struct acl));
90 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
93 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
94 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
96 error = mac_check_vnode_setacl(td->td_ucred, vp, type, &inkernacl);
100 error = VOP_SETACL(vp, type, &inkernacl, td->td_ucred, td);
104 VOP_UNLOCK(vp, 0, td);
105 vn_finished_write(mp);
110 * Given a vnode, get its ACL.
113 vacl_get_acl(struct thread *td, struct vnode *vp, acl_type_t type,
116 struct acl inkernelacl;
119 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
120 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
122 error = mac_check_vnode_getacl(td->td_ucred, vp, type);
126 error = VOP_GETACL(vp, type, &inkernelacl, td->td_ucred, td);
130 VOP_UNLOCK(vp, 0, td);
132 error = copyout(&inkernelacl, aclp, sizeof(struct acl));
137 * Given a vnode, delete its ACL.
140 vacl_delete(struct thread *td, struct vnode *vp, acl_type_t type)
145 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
148 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
149 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
151 error = mac_check_vnode_deleteacl(td->td_ucred, vp, type);
155 error = VOP_SETACL(vp, type, 0, td->td_ucred, td);
159 VOP_UNLOCK(vp, 0, td);
160 vn_finished_write(mp);
165 * Given a vnode, check whether an ACL is appropriate for it
168 vacl_aclcheck(struct thread *td, struct vnode *vp, acl_type_t type,
171 struct acl inkernelacl;
174 error = copyin(aclp, &inkernelacl, sizeof(struct acl));
177 error = VOP_ACLCHECK(vp, type, &inkernelacl, td->td_ucred, td);
182 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever. Don't
183 * need to lock, as the vacl_ code will get/release any locks required.
187 * Given a file path, get an ACL for it
190 __acl_get_file(struct thread *td, struct __acl_get_file_args *uap)
193 int vfslocked, error;
195 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
197 vfslocked = NDHASGIANT(&nd);
199 error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
202 VFS_UNLOCK_GIANT(vfslocked);
207 * Given a file path, get an ACL for it; don't follow links.
210 __acl_get_link(struct thread *td, struct __acl_get_link_args *uap)
213 int vfslocked, error;
215 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
217 vfslocked = NDHASGIANT(&nd);
219 error = vacl_get_acl(td, nd.ni_vp, uap->type, uap->aclp);
222 VFS_UNLOCK_GIANT(vfslocked);
227 * Given a file path, set an ACL for it.
230 __acl_set_file(struct thread *td, struct __acl_set_file_args *uap)
233 int vfslocked, error;
235 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
237 vfslocked = NDHASGIANT(&nd);
239 error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
242 VFS_UNLOCK_GIANT(vfslocked);
247 * Given a file path, set an ACL for it; don't follow links.
250 __acl_set_link(struct thread *td, struct __acl_set_link_args *uap)
253 int vfslocked, error;
255 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
257 vfslocked = NDHASGIANT(&nd);
259 error = vacl_set_acl(td, nd.ni_vp, uap->type, uap->aclp);
262 VFS_UNLOCK_GIANT(vfslocked);
267 * Given a file descriptor, get an ACL for it.
270 __acl_get_fd(struct thread *td, struct __acl_get_fd_args *uap)
273 int vfslocked, error;
275 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
277 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
278 error = vacl_get_acl(td, fp->f_vnode, uap->type, uap->aclp);
280 VFS_UNLOCK_GIANT(vfslocked);
286 * Given a file descriptor, set an ACL for it.
289 __acl_set_fd(struct thread *td, struct __acl_set_fd_args *uap)
292 int vfslocked, error;
294 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
296 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
297 error = vacl_set_acl(td, fp->f_vnode, uap->type, uap->aclp);
299 VFS_UNLOCK_GIANT(vfslocked);
305 * Given a file path, delete an ACL from it.
308 __acl_delete_file(struct thread *td, struct __acl_delete_file_args *uap)
311 int vfslocked, error;
313 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
315 vfslocked = NDHASGIANT(&nd);
317 error = vacl_delete(td, nd.ni_vp, uap->type);
320 VFS_UNLOCK_GIANT(vfslocked);
325 * Given a file path, delete an ACL from it; don't follow links.
328 __acl_delete_link(struct thread *td, struct __acl_delete_link_args *uap)
331 int vfslocked, error;
333 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
335 vfslocked = NDHASGIANT(&nd);
337 error = vacl_delete(td, nd.ni_vp, uap->type);
340 VFS_UNLOCK_GIANT(vfslocked);
345 * Given a file path, delete an ACL from it.
348 __acl_delete_fd(struct thread *td, struct __acl_delete_fd_args *uap)
351 int vfslocked, error;
353 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
355 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
356 error = vacl_delete(td, fp->f_vnode, uap->type);
358 VFS_UNLOCK_GIANT(vfslocked);
364 * Given a file path, check an ACL for it.
367 __acl_aclcheck_file(struct thread *td, struct __acl_aclcheck_file_args *uap)
370 int vfslocked, error;
372 NDINIT(&nd, LOOKUP, MPSAFE|FOLLOW, UIO_USERSPACE, uap->path, td);
374 vfslocked = NDHASGIANT(&nd);
376 error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
379 VFS_UNLOCK_GIANT(vfslocked);
384 * Given a file path, check an ACL for it; don't follow links.
387 __acl_aclcheck_link(struct thread *td, struct __acl_aclcheck_link_args *uap)
390 int vfslocked, error;
392 NDINIT(&nd, LOOKUP, MPSAFE|NOFOLLOW, UIO_USERSPACE, uap->path, td);
394 vfslocked = NDHASGIANT(&nd);
396 error = vacl_aclcheck(td, nd.ni_vp, uap->type, uap->aclp);
399 VFS_UNLOCK_GIANT(vfslocked);
404 * Given a file descriptor, check an ACL for it.
407 __acl_aclcheck_fd(struct thread *td, struct __acl_aclcheck_fd_args *uap)
410 int vfslocked, error;
412 error = getvnode(td->td_proc->p_fd, uap->filedes, &fp);
414 vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount);
415 error = vacl_aclcheck(td, fp->f_vnode, uap->type, uap->aclp);
417 VFS_UNLOCK_GIANT(vfslocked);
425 aclinit(void *dummy __unused)
428 acl_zone = uma_zcreate("ACL UMA zone", sizeof(struct acl),
429 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
431 SYSINIT(acls, SI_SUB_ACL, SI_ORDER_FIRST, aclinit, NULL);