kernel - use new td_ucred in numerous places
[dragonfly.git] / sys / kern / kern_acl.c
CommitLineData
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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 $
31e4e90f 27 * $DragonFly: src/sys/kern/kern_acl.c,v 1.17 2007/02/19 00:51:54 swildner 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>
fad57d0e 43#include <sys/nlookup.h>
984263bc 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
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50static int vacl_set_acl(struct vnode *vp, acl_type_t type, struct acl *aclp);
51static int vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp);
52static int vacl_aclcheck(struct vnode *vp, acl_type_t type, struct acl *aclp);
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53
54/*
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.
61 */
62
63/*
64 * Given a vnode, set its ACL.
65 */
66static int
41c20dac 67vacl_set_acl(struct vnode *vp, acl_type_t type, struct acl *aclp)
984263bc 68{
dadab5e9 69 struct thread *td = curthread;
984263bc 70 struct acl inkernacl;
dadab5e9 71 struct ucred *ucred;
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72 int error;
73
74 error = copyin(aclp, &inkernacl, sizeof(struct acl));
75 if (error)
76 return(error);
9910d07b 77 ucred = td->td_ucred;
dadab5e9 78
ca466bae 79 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
87de5057 80 error = VOP_SETACL(vp, type, &inkernacl, ucred);
a11aaa81 81 vn_unlock(vp);
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82 return(error);
83}
84
85/*
86 * Given a vnode, get its ACL.
87 */
88static int
41c20dac 89vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp)
984263bc 90{
dadab5e9 91 struct thread *td = curthread;
984263bc 92 struct acl inkernelacl;
dadab5e9 93 struct ucred *ucred;
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94 int error;
95
9910d07b 96 ucred = td->td_ucred;
87de5057 97 error = VOP_GETACL(vp, type, &inkernelacl, ucred);
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98 if (error == 0)
99 error = copyout(&inkernelacl, aclp, sizeof(struct acl));
100 return (error);
101}
102
103/*
104 * Given a vnode, delete its ACL.
105 */
106static int
41c20dac 107vacl_delete(struct vnode *vp, acl_type_t type)
984263bc 108{
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109 struct thread *td = curthread;
110 struct ucred *ucred;
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111 int error;
112
9910d07b 113 ucred = td->td_ucred;
ca466bae 114 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
87de5057 115 error = VOP_SETACL(vp, ACL_TYPE_DEFAULT, 0, ucred);
a11aaa81 116 vn_unlock(vp);
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117 return (error);
118}
119
120/*
121 * Given a vnode, check whether an ACL is appropriate for it
122 */
123static int
41c20dac 124vacl_aclcheck(struct vnode *vp, acl_type_t type, struct acl *aclp)
984263bc 125{
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126 struct thread *td = curthread;
127 struct ucred *ucred;
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128 struct acl inkernelacl;
129 int error;
130
9910d07b 131 ucred = td->td_ucred;
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132 error = copyin(aclp, &inkernelacl, sizeof(struct acl));
133 if (error)
134 return(error);
87de5057 135 error = VOP_ACLCHECK(vp, type, &inkernelacl, ucred);
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136 return (error);
137}
138
139/*
140 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever.
141 * Don't need to lock, as the vacl_ code will get/release any locks
142 * required.
143 */
144
145/*
146 * Given a file path, get an ACL for it
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147 *
148 * MPALMOSTSAFE
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149 */
150int
753fd850 151sys___acl_get_file(struct __acl_get_file_args *uap)
984263bc 152{
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153 struct nlookupdata nd;
154 struct vnode *vp;
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155 int error;
156
fad57d0e 157 vp = NULL;
3919ced0 158 get_mplock();
ab2eb4eb 159 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
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160 if (error == 0)
161 error = nlookup(&nd);
162 if (error == 0)
28623bf9 163 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
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164 nlookup_done(&nd);
165 if (error == 0) {
ab2eb4eb 166 error = vacl_get_acl(vp, uap->type, uap->aclp);
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167 vrele(vp);
168 }
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169 rel_mplock();
170
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171 return (error);
172}
173
174/*
175 * Given a file path, set an ACL for it
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176 *
177 * MPALMOSTSAFE
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178 */
179int
753fd850 180sys___acl_set_file(struct __acl_set_file_args *uap)
984263bc 181{
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182 struct nlookupdata nd;
183 struct vnode *vp;
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184 int error;
185
fad57d0e 186 vp = NULL;
3919ced0 187 get_mplock();
ab2eb4eb 188 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
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189 if (error == 0)
190 error = nlookup(&nd);
191 if (error == 0)
28623bf9 192 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
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193 nlookup_done(&nd);
194 if (error == 0) {
ab2eb4eb 195 error = vacl_set_acl(vp, uap->type, uap->aclp);
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196 vrele(vp);
197 }
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198 rel_mplock();
199
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200 return (error);
201}
202
203/*
204 * Given a file descriptor, get an ACL for it
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205 *
206 * MPALMOSTSAFE
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207 */
208int
753fd850 209sys___acl_get_fd(struct __acl_get_fd_args *uap)
984263bc 210{
dadab5e9 211 struct thread *td = curthread;
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212 struct file *fp;
213 int error;
214
dadab5e9 215 KKASSERT(td->td_proc);
5b287bba 216 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
984263bc 217 return(error);
3919ced0 218 get_mplock();
5b287bba 219 error = vacl_get_acl((struct vnode *)fp->f_data, uap->type, uap->aclp);
3919ced0 220 rel_mplock();
5b287bba 221 fdrop(fp);
3919ced0 222
5b287bba 223 return (error);
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224}
225
226/*
227 * Given a file descriptor, set an ACL for it
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228 *
229 * MPALMOSTSAFE
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230 */
231int
753fd850 232sys___acl_set_fd(struct __acl_set_fd_args *uap)
984263bc 233{
dadab5e9 234 struct thread *td = curthread;
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235 struct file *fp;
236 int error;
237
dadab5e9 238 KKASSERT(td->td_proc);
5b287bba 239 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
984263bc 240 return(error);
3919ced0 241 get_mplock();
5b287bba 242 error = vacl_set_acl((struct vnode *)fp->f_data, uap->type, uap->aclp);
3919ced0 243 rel_mplock();
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244 fdrop(fp);
245 return (error);
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246}
247
248/*
249 * Given a file path, delete an ACL from it.
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250 *
251 * MPALMOSTSAFE
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252 */
253int
753fd850 254sys___acl_delete_file(struct __acl_delete_file_args *uap)
984263bc 255{
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256 struct nlookupdata nd;
257 struct vnode *vp;
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258 int error;
259
fad57d0e 260 vp = NULL;
3919ced0 261 get_mplock();
ab2eb4eb 262 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
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263 if (error == 0)
264 error = nlookup(&nd);
265 if (error == 0)
28623bf9 266 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
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267 nlookup_done(&nd);
268
269 if (error == 0) {
ab2eb4eb 270 error = vacl_delete(vp, uap->type);
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271 vrele(vp);
272 }
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273 rel_mplock();
274
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275 return (error);
276}
277
278/*
279 * Given a file path, delete an ACL from it.
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280 *
281 * MPALMOSTSAFE
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282 */
283int
753fd850 284sys___acl_delete_fd(struct __acl_delete_fd_args *uap)
984263bc 285{
dadab5e9 286 struct thread *td = curthread;
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287 struct file *fp;
288 int error;
289
dadab5e9 290 KKASSERT(td->td_proc);
5b287bba 291 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
984263bc 292 return(error);
3919ced0 293 get_mplock();
ab2eb4eb 294 error = vacl_delete((struct vnode *)fp->f_data, uap->type);
3919ced0 295 rel_mplock();
5b287bba 296 fdrop(fp);
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297 return (error);
298}
299
300/*
301 * Given a file path, check an ACL for it
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302 *
303 * MPALMOSTSAFE
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304 */
305int
753fd850 306sys___acl_aclcheck_file(struct __acl_aclcheck_file_args *uap)
984263bc 307{
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308 struct nlookupdata nd;
309 struct vnode *vp;
310 int error;
984263bc 311
fad57d0e 312 vp = NULL;
3919ced0 313 get_mplock();
ab2eb4eb 314 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
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315 if (error == 0)
316 error = nlookup(&nd);
317 if (error == 0)
28623bf9 318 error = cache_vref(&nd.nl_nch, nd.nl_cred, &vp);
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319 nlookup_done(&nd);
320
321 if (error == 0) {
ab2eb4eb 322 error = vacl_aclcheck(vp, uap->type, uap->aclp);
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323 vrele(vp);
324 }
3919ced0 325 rel_mplock();
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326 return (error);
327}
328
329/*
330 * Given a file descriptor, check an ACL for it
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331 *
332 * MPALMOSTSAFE
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333 */
334int
753fd850 335sys___acl_aclcheck_fd(struct __acl_aclcheck_fd_args *uap)
984263bc 336{
dadab5e9 337 struct thread *td = curthread;
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338 struct file *fp;
339 int error;
340
dadab5e9 341 KKASSERT(td->td_proc);
5b287bba 342 if ((error = holdvnode(td->td_proc->p_fd, uap->filedes, &fp)) != 0)
984263bc 343 return(error);
3919ced0 344 get_mplock();
5b287bba 345 error = vacl_aclcheck((struct vnode *)fp->f_data, uap->type, uap->aclp);
3919ced0 346 rel_mplock();
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347 fdrop(fp);
348 return (error);
984263bc 349}
5b287bba 350