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
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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 1.5 2003/09/23 05:03:51 dillon 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/namei.h>
45 #include <sys/sysent.h>
46 #include <sys/errno.h>
50 static MALLOC_DEFINE(M_ACL, "acl", "access control list");
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));
79 KKASSERT(td->td_proc);
80 ucred = td->td_proc->p_ucred;
82 VOP_LEASE(vp, td, ucred, LEASE_WRITE);
83 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
84 error = VOP_SETACL(vp, type, &inkernacl, ucred, td);
85 VOP_UNLOCK(vp, 0, td);
90 * Given a vnode, get its ACL.
93 vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp)
95 struct thread *td = curthread;
96 struct acl inkernelacl;
100 KKASSERT(td->td_proc);
101 ucred = td->td_proc->p_ucred;
102 error = VOP_GETACL(vp, type, &inkernelacl, ucred, td);
104 error = copyout(&inkernelacl, aclp, sizeof(struct acl));
109 * Given a vnode, delete its ACL.
112 vacl_delete(struct vnode *vp, acl_type_t type)
114 struct thread *td = curthread;
118 KKASSERT(td->td_proc);
119 ucred = td->td_proc->p_ucred;
120 VOP_LEASE(vp, td, ucred, LEASE_WRITE);
121 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
122 error = VOP_SETACL(vp, ACL_TYPE_DEFAULT, 0, ucred, td);
123 VOP_UNLOCK(vp, 0, td);
128 * Given a vnode, check whether an ACL is appropriate for it
131 vacl_aclcheck(struct vnode *vp, acl_type_t type, struct acl *aclp)
133 struct thread *td = curthread;
135 struct acl inkernelacl;
138 KKASSERT(td->td_proc);
139 ucred = td->td_proc->p_ucred;
140 error = copyin(aclp, &inkernelacl, sizeof(struct acl));
143 error = VOP_ACLCHECK(vp, type, &inkernelacl, ucred, td);
148 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever.
149 * Don't need to lock, as the vacl_ code will get/release any locks
154 * Given a file path, get an ACL for it
157 __acl_get_file(struct __acl_get_file_args *uap)
159 struct thread *td = curthread;
163 /* what flags are required here -- possible not LOCKLEAF? */
164 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
165 UIO_USERSPACE, SCARG(uap, path), td);
169 error = vacl_get_acl(nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
175 * Given a file path, set an ACL for it
178 __acl_set_file(struct __acl_set_file_args *uap)
180 struct thread *td = curthread;
184 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
185 UIO_USERSPACE, SCARG(uap, path), td);
189 error = vacl_set_acl(nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
195 * Given a file descriptor, get an ACL for it
198 __acl_get_fd(struct __acl_get_fd_args *uap)
200 struct thread *td = curthread;
204 KKASSERT(td->td_proc);
205 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
208 return vacl_get_acl((struct vnode *)fp->f_data, SCARG(uap, type),
213 * Given a file descriptor, set an ACL for it
216 __acl_set_fd(struct __acl_set_fd_args *uap)
218 struct thread *td = curthread;
222 KKASSERT(td->td_proc);
223 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
226 return vacl_set_acl((struct vnode *)fp->f_data, SCARG(uap, type),
231 * Given a file path, delete an ACL from it.
234 __acl_delete_file(struct __acl_delete_file_args *uap)
236 struct thread *td = curthread;
240 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
241 UIO_USERSPACE, SCARG(uap, path), td);
245 error = vacl_delete(nd.ni_vp, SCARG(uap, type));
251 * Given a file path, delete an ACL from it.
254 __acl_delete_fd(struct __acl_delete_fd_args *uap)
256 struct thread *td = curthread;
260 KKASSERT(td->td_proc);
261 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
264 error = vacl_delete((struct vnode *)fp->f_data, SCARG(uap, type));
269 * Given a file path, check an ACL for it
272 __acl_aclcheck_file(struct __acl_aclcheck_file_args *uap)
274 struct thread *td = curthread;
278 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
279 UIO_USERSPACE, SCARG(uap, path), td);
283 error = vacl_aclcheck(nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
289 * Given a file descriptor, check an ACL for it
292 __acl_aclcheck_fd(struct __acl_aclcheck_fd_args *uap)
294 struct thread *td = curthread;
298 KKASSERT(td->td_proc);
299 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
302 return vacl_aclcheck((struct vnode *)fp->f_data, SCARG(uap, type),