get mxge to build, stage 29/many
[dragonfly.git] / sys / kern / kern_acl.c
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1 /*-
2 * Copyright (c) 1999, 2000 Robert N. M. Watson
3 * All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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
24 * SUCH DAMAGE.
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>
41 #include <sys/lock.h>
42 #include <sys/proc.h>
43 #include <sys/nlookup.h>
44 #include <sys/file.h>
45 #include <sys/sysent.h>
46 #include <sys/errno.h>
47 #include <sys/stat.h>
48 #include <sys/acl.h>
50 static int vacl_set_acl(struct vnode *vp, acl_type_t type, struct acl *aclp);
51 static int vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp);
52 static int vacl_aclcheck(struct vnode *vp, acl_type_t type, struct acl *aclp);
55 * These calls wrap the real vnode operations, and are called by the
56 * syscall code once the syscall has converted the path or file
57 * descriptor to a vnode (unlocked). The aclp pointer is assumed
58 * still to point to userland, so this should not be consumed within
59 * the kernel except by syscall code. Other code should directly
60 * invoke VOP_{SET,GET}ACL.
64 * Given a vnode, set its ACL.
66 static int
67 vacl_set_acl(struct vnode *vp, acl_type_t type, struct acl *aclp)
69 struct thread *td = curthread;
70 struct acl inkernacl;
71 struct ucred *ucred;
72 int error;
74 error = copyin(aclp, &inkernacl, sizeof(struct acl));
75 if (error)
76 return(error);
77 KKASSERT(td->td_proc);
78 ucred = td->td_proc->p_ucred;
80 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
81 error = VOP_SETACL(vp, type, &inkernacl, ucred);
82 vn_unlock(vp);
83 return(error);
87 * Given a vnode, get its ACL.
89 static int
90 vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp)
92 struct thread *td = curthread;
93 struct acl inkernelacl;
94 struct ucred *ucred;
95 int error;
97 KKASSERT(td->td_proc);
98 ucred = td->td_proc->p_ucred;
99 error = VOP_GETACL(vp, type, &inkernelacl, ucred);
100 if (error == 0)
101 error = copyout(&inkernelacl, aclp, sizeof(struct acl));
102 return (error);
106 * Given a vnode, delete its ACL.
108 static int
109 vacl_delete(struct vnode *vp, acl_type_t type)
111 struct thread *td = curthread;
112 struct ucred *ucred;
113 int error;
115 KKASSERT(td->td_proc);
116 ucred = td->td_proc->p_ucred;
117 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
118 error = VOP_SETACL(vp, ACL_TYPE_DEFAULT, 0, ucred);
119 vn_unlock(vp);
120 return (error);
124 * Given a vnode, check whether an ACL is appropriate for it
126 static int
127 vacl_aclcheck(struct vnode *vp, acl_type_t type, struct acl *aclp)
129 struct thread *td = curthread;
130 struct ucred *ucred;
131 struct acl inkernelacl;
132 int error;
134 KKASSERT(td->td_proc);
135 ucred = td->td_proc->p_ucred;
136 error = copyin(aclp, &inkernelacl, sizeof(struct acl));
137 if (error)
138 return(error);
139 error = VOP_ACLCHECK(vp, type, &inkernelacl, ucred);
140 return (error);
144 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever.
145 * Don't need to lock, as the vacl_ code will get/release any locks
146 * required.
150 * Given a file path, get an ACL for it
153 sys___acl_get_file(struct __acl_get_file_args *uap)
155 struct nlookupdata nd;
156 struct vnode *vp;
157 int error;
159 vp = NULL;
160 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
161 if (error == 0)
162 error = nlookup(&nd);
163 if (error == 0)
164 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
165 nlookup_done(&nd);
166 if (error == 0) {
167 error = vacl_get_acl(vp, uap->type, uap->aclp);
168 vrele(vp);
170 return (error);
174 * Given a file path, set an ACL for it
177 sys___acl_set_file(struct __acl_set_file_args *uap)
179 struct nlookupdata nd;
180 struct vnode *vp;
181 int error;
183 vp = NULL;
184 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
185 if (error == 0)
186 error = nlookup(&nd);
187 if (error == 0)
188 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
189 nlookup_done(&nd);
190 if (error == 0) {
191 error = vacl_set_acl(vp, uap->type, uap->aclp);
192 vrele(vp);
194 return (error);
198 * Given a file descriptor, get an ACL for it
201 sys___acl_get_fd(struct __acl_get_fd_args *uap)
203 struct thread *td = curthread;
204 struct file *fp;
205 int error;
207 KKASSERT(td->td_proc);
208 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
209 return(error);
210 error = vacl_get_acl((struct vnode *)fp->f_data, uap->type, uap->aclp);
211 fdrop(fp);
212 return (error);
216 * Given a file descriptor, set an ACL for it
219 sys___acl_set_fd(struct __acl_set_fd_args *uap)
221 struct thread *td = curthread;
222 struct file *fp;
223 int error;
225 KKASSERT(td->td_proc);
226 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
227 return(error);
228 error = vacl_set_acl((struct vnode *)fp->f_data, uap->type, uap->aclp);
229 fdrop(fp);
230 return (error);
234 * Given a file path, delete an ACL from it.
237 sys___acl_delete_file(struct __acl_delete_file_args *uap)
239 struct nlookupdata nd;
240 struct vnode *vp;
241 int error;
243 vp = NULL;
244 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
245 if (error == 0)
246 error = nlookup(&nd);
247 if (error == 0)
248 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
249 nlookup_done(&nd);
251 if (error == 0) {
252 error = vacl_delete(vp, uap->type);
253 vrele(vp);
255 return (error);
259 * Given a file path, delete an ACL from it.
262 sys___acl_delete_fd(struct __acl_delete_fd_args *uap)
264 struct thread *td = curthread;
265 struct file *fp;
266 int error;
268 KKASSERT(td->td_proc);
269 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
270 return(error);
271 error = vacl_delete((struct vnode *)fp->f_data, uap->type);
272 fdrop(fp);
273 return (error);
277 * Given a file path, check an ACL for it
280 sys___acl_aclcheck_file(struct __acl_aclcheck_file_args *uap)
282 struct nlookupdata nd;
283 struct vnode *vp;
284 int error;
286 vp = NULL;
287 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
288 if (error == 0)
289 error = nlookup(&nd);
290 if (error == 0)
291 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
292 nlookup_done(&nd);
294 if (error == 0) {
295 error = vacl_aclcheck(vp, uap->type, uap->aclp);
296 vrele(vp);
298 return (error);
302 * Given a file descriptor, check an ACL for it
305 sys___acl_aclcheck_fd(struct __acl_aclcheck_fd_args *uap)
307 struct thread *td = curthread;
308 struct file *fp;
309 int error;
311 KKASSERT(td->td_proc);
312 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
313 return(error);
314 error = vacl_aclcheck((struct vnode *)fp->f_data, uap->type, uap->aclp);
315 fdrop(fp);
316 return (error);