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 1.17 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
153 sys___acl_get_file(struct __acl_get_file_args *uap)
155 struct nlookupdata nd;
161 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
163 error = nlookup(&nd);
165 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
168 error = vacl_get_acl(vp, uap->type, uap->aclp);
177 * Given a file path, set an ACL for it
182 sys___acl_set_file(struct __acl_set_file_args *uap)
184 struct nlookupdata nd;
190 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
192 error = nlookup(&nd);
194 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
197 error = vacl_set_acl(vp, uap->type, uap->aclp);
206 * Given a file descriptor, get an ACL for it
211 sys___acl_get_fd(struct __acl_get_fd_args *uap)
213 struct thread *td = curthread;
217 KKASSERT(td->td_proc);
218 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
221 error = vacl_get_acl((struct vnode *)fp->f_data, uap->type, uap->aclp);
229 * Given a file descriptor, set an ACL for it
234 sys___acl_set_fd(struct __acl_set_fd_args *uap)
236 struct thread *td = curthread;
240 KKASSERT(td->td_proc);
241 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
244 error = vacl_set_acl((struct vnode *)fp->f_data, uap->type, uap->aclp);
251 * Given a file path, delete an ACL from it.
256 sys___acl_delete_file(struct __acl_delete_file_args *uap)
258 struct nlookupdata nd;
264 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
266 error = nlookup(&nd);
268 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
272 error = vacl_delete(vp, uap->type);
281 * Given a file path, delete an ACL from it.
286 sys___acl_delete_fd(struct __acl_delete_fd_args *uap)
288 struct thread *td = curthread;
292 KKASSERT(td->td_proc);
293 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
296 error = vacl_delete((struct vnode *)fp->f_data, uap->type);
303 * Given a file path, check an ACL for it
308 sys___acl_aclcheck_file(struct __acl_aclcheck_file_args *uap)
310 struct nlookupdata nd;
316 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
318 error = nlookup(&nd);
320 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
324 error = vacl_aclcheck(vp, uap->type, uap->aclp);
332 * Given a file descriptor, check an ACL for it
337 sys___acl_aclcheck_fd(struct __acl_aclcheck_fd_args *uap)
339 struct thread *td = curthread;
343 KKASSERT(td->td_proc);
344 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
347 error = vacl_aclcheck((struct vnode *)fp->f_data, uap->type, uap->aclp);