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[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.
4 *
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.
13 *
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.
25 *
26 * $FreeBSD: src/sys/kern/kern_acl.c,v 1.2.2.1 2000/07/28 18:48:16 rwatson Exp $
5fd012e0 27 * $DragonFly: src/sys/kern/kern_acl.c,v 1.7 2004/10/12 19:20:46 dillon Exp $
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28 */
29
30/*
31 * Generic routines to support file system ACLs, at a syntactic level
32 * Semantics are the responsibility of the underlying file system
33 */
34
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>
dadab5e9 42#include <sys/proc.h>
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43#include <sys/namei.h>
44#include <sys/file.h>
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45#include <sys/sysent.h>
46#include <sys/errno.h>
47#include <sys/stat.h>
48#include <sys/acl.h>
49
50static MALLOC_DEFINE(M_ACL, "acl", "access control list");
51
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52static int vacl_set_acl(struct vnode *vp, acl_type_t type, struct acl *aclp);
53static int vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp);
54static int vacl_aclcheck(struct vnode *vp, acl_type_t type, struct acl *aclp);
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55
56/*
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.
63 */
64
65/*
66 * Given a vnode, set its ACL.
67 */
68static int
41c20dac 69vacl_set_acl(struct vnode *vp, acl_type_t type, struct acl *aclp)
984263bc 70{
dadab5e9 71 struct thread *td = curthread;
984263bc 72 struct acl inkernacl;
dadab5e9 73 struct ucred *ucred;
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74 int error;
75
76 error = copyin(aclp, &inkernacl, sizeof(struct acl));
77 if (error)
78 return(error);
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79 KKASSERT(td->td_proc);
80 ucred = td->td_proc->p_ucred;
81
82 VOP_LEASE(vp, td, ucred, LEASE_WRITE);
5fd012e0 83 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
dadab5e9 84 error = VOP_SETACL(vp, type, &inkernacl, ucred, td);
5fd012e0 85 VOP_UNLOCK(vp, 0, td);
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86 return(error);
87}
88
89/*
90 * Given a vnode, get its ACL.
91 */
92static int
41c20dac 93vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp)
984263bc 94{
dadab5e9 95 struct thread *td = curthread;
984263bc 96 struct acl inkernelacl;
dadab5e9 97 struct ucred *ucred;
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98 int error;
99
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100 KKASSERT(td->td_proc);
101 ucred = td->td_proc->p_ucred;
102 error = VOP_GETACL(vp, type, &inkernelacl, ucred, td);
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103 if (error == 0)
104 error = copyout(&inkernelacl, aclp, sizeof(struct acl));
105 return (error);
106}
107
108/*
109 * Given a vnode, delete its ACL.
110 */
111static int
41c20dac 112vacl_delete(struct vnode *vp, acl_type_t type)
984263bc 113{
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114 struct thread *td = curthread;
115 struct ucred *ucred;
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116 int error;
117
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118 KKASSERT(td->td_proc);
119 ucred = td->td_proc->p_ucred;
120 VOP_LEASE(vp, td, ucred, LEASE_WRITE);
5fd012e0 121 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
dadab5e9 122 error = VOP_SETACL(vp, ACL_TYPE_DEFAULT, 0, ucred, td);
5fd012e0 123 VOP_UNLOCK(vp, 0, td);
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124 return (error);
125}
126
127/*
128 * Given a vnode, check whether an ACL is appropriate for it
129 */
130static int
41c20dac 131vacl_aclcheck(struct vnode *vp, acl_type_t type, struct acl *aclp)
984263bc 132{
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133 struct thread *td = curthread;
134 struct ucred *ucred;
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135 struct acl inkernelacl;
136 int error;
137
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138 KKASSERT(td->td_proc);
139 ucred = td->td_proc->p_ucred;
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140 error = copyin(aclp, &inkernelacl, sizeof(struct acl));
141 if (error)
142 return(error);
dadab5e9 143 error = VOP_ACLCHECK(vp, type, &inkernelacl, ucred, td);
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144 return (error);
145}
146
147/*
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
150 * required.
151 */
152
153/*
154 * Given a file path, get an ACL for it
155 */
156int
41c20dac 157__acl_get_file(struct __acl_get_file_args *uap)
984263bc 158{
dadab5e9 159 struct thread *td = curthread;
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160 struct nameidata nd;
161 int error;
162
163 /* what flags are required here -- possible not LOCKLEAF? */
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164 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
165 UIO_USERSPACE, SCARG(uap, path), td);
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166 error = namei(&nd);
167 if (error)
168 return(error);
41c20dac 169 error = vacl_get_acl(nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
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170 NDFREE(&nd, 0);
171 return (error);
172}
173
174/*
175 * Given a file path, set an ACL for it
176 */
177int
41c20dac 178__acl_set_file(struct __acl_set_file_args *uap)
984263bc 179{
dadab5e9 180 struct thread *td = curthread;
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181 struct nameidata nd;
182 int error;
183
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184 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
185 UIO_USERSPACE, SCARG(uap, path), td);
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186 error = namei(&nd);
187 if (error)
188 return(error);
41c20dac 189 error = vacl_set_acl(nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
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190 NDFREE(&nd, 0);
191 return (error);
192}
193
194/*
195 * Given a file descriptor, get an ACL for it
196 */
197int
41c20dac 198__acl_get_fd(struct __acl_get_fd_args *uap)
984263bc 199{
dadab5e9 200 struct thread *td = curthread;
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201 struct file *fp;
202 int error;
203
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204 KKASSERT(td->td_proc);
205 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
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206 if (error)
207 return(error);
41c20dac 208 return vacl_get_acl((struct vnode *)fp->f_data, SCARG(uap, type),
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209 SCARG(uap, aclp));
210}
211
212/*
213 * Given a file descriptor, set an ACL for it
214 */
215int
41c20dac 216__acl_set_fd(struct __acl_set_fd_args *uap)
984263bc 217{
dadab5e9 218 struct thread *td = curthread;
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219 struct file *fp;
220 int error;
221
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222 KKASSERT(td->td_proc);
223 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
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224 if (error)
225 return(error);
41c20dac 226 return vacl_set_acl((struct vnode *)fp->f_data, SCARG(uap, type),
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227 SCARG(uap, aclp));
228}
229
230/*
231 * Given a file path, delete an ACL from it.
232 */
233int
41c20dac 234__acl_delete_file(struct __acl_delete_file_args *uap)
984263bc 235{
dadab5e9 236 struct thread *td = curthread;
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237 struct nameidata nd;
238 int error;
239
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240 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
241 UIO_USERSPACE, SCARG(uap, path), td);
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242 error = namei(&nd);
243 if (error)
244 return(error);
41c20dac 245 error = vacl_delete(nd.ni_vp, SCARG(uap, type));
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246 NDFREE(&nd, 0);
247 return (error);
248}
249
250/*
251 * Given a file path, delete an ACL from it.
252 */
253int
41c20dac 254__acl_delete_fd(struct __acl_delete_fd_args *uap)
984263bc 255{
dadab5e9 256 struct thread *td = curthread;
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257 struct file *fp;
258 int error;
259
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260 KKASSERT(td->td_proc);
261 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
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262 if (error)
263 return(error);
41c20dac 264 error = vacl_delete((struct vnode *)fp->f_data, SCARG(uap, type));
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265 return (error);
266}
267
268/*
269 * Given a file path, check an ACL for it
270 */
271int
41c20dac 272__acl_aclcheck_file(struct __acl_aclcheck_file_args *uap)
984263bc 273{
dadab5e9 274 struct thread *td = curthread;
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275 struct nameidata nd;
276 int error;
277
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278 NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW,
279 UIO_USERSPACE, SCARG(uap, path), td);
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280 error = namei(&nd);
281 if (error)
282 return(error);
41c20dac 283 error = vacl_aclcheck(nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp));
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284 NDFREE(&nd, 0);
285 return (error);
286}
287
288/*
289 * Given a file descriptor, check an ACL for it
290 */
291int
41c20dac 292__acl_aclcheck_fd(struct __acl_aclcheck_fd_args *uap)
984263bc 293{
dadab5e9 294 struct thread *td = curthread;
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295 struct file *fp;
296 int error;
297
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298 KKASSERT(td->td_proc);
299 error = getvnode(td->td_proc->p_fd, SCARG(uap, filedes), &fp);
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300 if (error)
301 return(error);
41c20dac 302 return vacl_aclcheck((struct vnode *)fp->f_data, SCARG(uap, type),
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303 SCARG(uap, aclp));
304}