1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Process version 2 NFSACL requests.
4 *
5 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
6 */
7
8 #include "nfsd.h"
9 /* FIXME: nfsacl.h is a broken header */
10 #include <linux/nfsacl.h>
11 #include <linux/gfp.h>
12 #include "cache.h"
13 #include "xdr3.h"
14 #include "vfs.h"
15
16 #define NFSDDBG_FACILITY NFSDDBG_PROC
17
18 /*
19 * NULL call.
20 */
21 static __be32
nfsacld_proc_null(struct svc_rqst * rqstp)22 nfsacld_proc_null(struct svc_rqst *rqstp)
23 {
24 return rpc_success;
25 }
26
27 /*
28 * Get the Access and/or Default ACL of a file.
29 */
nfsacld_proc_getacl(struct svc_rqst * rqstp)30 static __be32 nfsacld_proc_getacl(struct svc_rqst *rqstp)
31 {
32 struct nfsd3_getaclargs *argp = rqstp->rq_argp;
33 struct nfsd3_getaclres *resp = rqstp->rq_resp;
34 struct posix_acl *acl;
35 struct inode *inode;
36 svc_fh *fh;
37
38 dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
39
40 fh = fh_copy(&resp->fh, &argp->fh);
41 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
42 if (resp->status != nfs_ok)
43 goto out;
44
45 inode = d_inode(fh->fh_dentry);
46
47 if (argp->mask & ~NFS_ACL_MASK) {
48 resp->status = nfserr_inval;
49 goto out;
50 }
51 resp->mask = argp->mask;
52
53 resp->status = fh_getattr(fh, &resp->stat);
54 if (resp->status != nfs_ok)
55 goto out;
56
57 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
58 acl = get_acl(inode, ACL_TYPE_ACCESS);
59 if (acl == NULL) {
60 /* Solaris returns the inode's minimum ACL. */
61 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
62 }
63 if (IS_ERR(acl)) {
64 resp->status = nfserrno(PTR_ERR(acl));
65 goto fail;
66 }
67 resp->acl_access = acl;
68 }
69 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
70 /* Check how Solaris handles requests for the Default ACL
71 of a non-directory! */
72 acl = get_acl(inode, ACL_TYPE_DEFAULT);
73 if (IS_ERR(acl)) {
74 resp->status = nfserrno(PTR_ERR(acl));
75 goto fail;
76 }
77 resp->acl_default = acl;
78 }
79
80 /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
81 out:
82 return rpc_success;
83
84 fail:
85 posix_acl_release(resp->acl_access);
86 posix_acl_release(resp->acl_default);
87 goto out;
88 }
89
90 /*
91 * Set the Access and/or Default ACL of a file.
92 */
nfsacld_proc_setacl(struct svc_rqst * rqstp)93 static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp)
94 {
95 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
96 struct nfsd_attrstat *resp = rqstp->rq_resp;
97 struct inode *inode;
98 svc_fh *fh;
99 int error;
100
101 dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
102
103 fh = fh_copy(&resp->fh, &argp->fh);
104 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
105 if (resp->status != nfs_ok)
106 goto out;
107
108 inode = d_inode(fh->fh_dentry);
109
110 error = fh_want_write(fh);
111 if (error)
112 goto out_errno;
113
114 fh_lock(fh);
115
116 error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
117 if (error)
118 goto out_drop_lock;
119 error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
120 if (error)
121 goto out_drop_lock;
122
123 fh_unlock(fh);
124
125 fh_drop_write(fh);
126
127 resp->status = fh_getattr(fh, &resp->stat);
128
129 out:
130 /* argp->acl_{access,default} may have been allocated in
131 nfssvc_decode_setaclargs. */
132 posix_acl_release(argp->acl_access);
133 posix_acl_release(argp->acl_default);
134 return rpc_success;
135
136 out_drop_lock:
137 fh_unlock(fh);
138 fh_drop_write(fh);
139 out_errno:
140 resp->status = nfserrno(error);
141 goto out;
142 }
143
144 /*
145 * Check file attributes
146 */
nfsacld_proc_getattr(struct svc_rqst * rqstp)147 static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)
148 {
149 struct nfsd_fhandle *argp = rqstp->rq_argp;
150 struct nfsd_attrstat *resp = rqstp->rq_resp;
151
152 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
153
154 fh_copy(&resp->fh, &argp->fh);
155 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
156 if (resp->status != nfs_ok)
157 goto out;
158 resp->status = fh_getattr(&resp->fh, &resp->stat);
159 out:
160 return rpc_success;
161 }
162
163 /*
164 * Check file access
165 */
nfsacld_proc_access(struct svc_rqst * rqstp)166 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
167 {
168 struct nfsd3_accessargs *argp = rqstp->rq_argp;
169 struct nfsd3_accessres *resp = rqstp->rq_resp;
170
171 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
172 SVCFH_fmt(&argp->fh),
173 argp->access);
174
175 fh_copy(&resp->fh, &argp->fh);
176 resp->access = argp->access;
177 resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
178 if (resp->status != nfs_ok)
179 goto out;
180 resp->status = fh_getattr(&resp->fh, &resp->stat);
181 out:
182 return rpc_success;
183 }
184
185 /*
186 * XDR decode functions
187 */
nfsaclsvc_decode_voidarg(struct svc_rqst * rqstp,__be32 * p)188 static int nfsaclsvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
189 {
190 return 1;
191 }
192
nfsaclsvc_decode_getaclargs(struct svc_rqst * rqstp,__be32 * p)193 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
194 {
195 struct nfsd3_getaclargs *argp = rqstp->rq_argp;
196
197 p = nfs2svc_decode_fh(p, &argp->fh);
198 if (!p)
199 return 0;
200 argp->mask = ntohl(*p); p++;
201
202 return xdr_argsize_check(rqstp, p);
203 }
204
205
nfsaclsvc_decode_setaclargs(struct svc_rqst * rqstp,__be32 * p)206 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
207 {
208 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
209 struct kvec *head = rqstp->rq_arg.head;
210 unsigned int base;
211 int n;
212
213 p = nfs2svc_decode_fh(p, &argp->fh);
214 if (!p)
215 return 0;
216 argp->mask = ntohl(*p++);
217 if (argp->mask & ~NFS_ACL_MASK ||
218 !xdr_argsize_check(rqstp, p))
219 return 0;
220
221 base = (char *)p - (char *)head->iov_base;
222 n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
223 (argp->mask & NFS_ACL) ?
224 &argp->acl_access : NULL);
225 if (n > 0)
226 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
227 (argp->mask & NFS_DFACL) ?
228 &argp->acl_default : NULL);
229 return (n > 0);
230 }
231
nfsaclsvc_decode_fhandleargs(struct svc_rqst * rqstp,__be32 * p)232 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
233 {
234 struct nfsd_fhandle *argp = rqstp->rq_argp;
235
236 p = nfs2svc_decode_fh(p, &argp->fh);
237 if (!p)
238 return 0;
239 return xdr_argsize_check(rqstp, p);
240 }
241
nfsaclsvc_decode_accessargs(struct svc_rqst * rqstp,__be32 * p)242 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
243 {
244 struct nfsd3_accessargs *argp = rqstp->rq_argp;
245
246 p = nfs2svc_decode_fh(p, &argp->fh);
247 if (!p)
248 return 0;
249 argp->access = ntohl(*p++);
250
251 return xdr_argsize_check(rqstp, p);
252 }
253
254 /*
255 * XDR encode functions
256 */
257
258 /*
259 * There must be an encoding function for void results so svc_process
260 * will work properly.
261 */
nfsaclsvc_encode_voidres(struct svc_rqst * rqstp,__be32 * p)262 static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
263 {
264 return xdr_ressize_check(rqstp, p);
265 }
266
267 /* GETACL */
nfsaclsvc_encode_getaclres(struct svc_rqst * rqstp,__be32 * p)268 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
269 {
270 struct nfsd3_getaclres *resp = rqstp->rq_resp;
271 struct dentry *dentry = resp->fh.fh_dentry;
272 struct inode *inode;
273 struct kvec *head = rqstp->rq_res.head;
274 unsigned int base;
275 int n;
276 int w;
277
278 *p++ = resp->status;
279 if (resp->status != nfs_ok)
280 return xdr_ressize_check(rqstp, p);
281
282 /*
283 * Since this is version 2, the check for nfserr in
284 * nfsd_dispatch actually ensures the following cannot happen.
285 * However, it seems fragile to depend on that.
286 */
287 if (dentry == NULL || d_really_is_negative(dentry))
288 return 0;
289 inode = d_inode(dentry);
290
291 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
292 *p++ = htonl(resp->mask);
293 if (!xdr_ressize_check(rqstp, p))
294 return 0;
295 base = (char *)p - (char *)head->iov_base;
296
297 rqstp->rq_res.page_len = w = nfsacl_size(
298 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
299 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
300 while (w > 0) {
301 if (!*(rqstp->rq_next_page++))
302 return 0;
303 w -= PAGE_SIZE;
304 }
305
306 n = nfsacl_encode(&rqstp->rq_res, base, inode,
307 resp->acl_access,
308 resp->mask & NFS_ACL, 0);
309 if (n > 0)
310 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
311 resp->acl_default,
312 resp->mask & NFS_DFACL,
313 NFS_ACL_DEFAULT);
314 return (n > 0);
315 }
316
nfsaclsvc_encode_attrstatres(struct svc_rqst * rqstp,__be32 * p)317 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
318 {
319 struct nfsd_attrstat *resp = rqstp->rq_resp;
320
321 *p++ = resp->status;
322 if (resp->status != nfs_ok)
323 goto out;
324
325 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
326 out:
327 return xdr_ressize_check(rqstp, p);
328 }
329
330 /* ACCESS */
nfsaclsvc_encode_accessres(struct svc_rqst * rqstp,__be32 * p)331 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
332 {
333 struct nfsd3_accessres *resp = rqstp->rq_resp;
334
335 *p++ = resp->status;
336 if (resp->status != nfs_ok)
337 goto out;
338
339 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
340 *p++ = htonl(resp->access);
341 out:
342 return xdr_ressize_check(rqstp, p);
343 }
344
345 /*
346 * XDR release functions
347 */
nfsaclsvc_release_getacl(struct svc_rqst * rqstp)348 static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp)
349 {
350 struct nfsd3_getaclres *resp = rqstp->rq_resp;
351
352 fh_put(&resp->fh);
353 posix_acl_release(resp->acl_access);
354 posix_acl_release(resp->acl_default);
355 }
356
nfsaclsvc_release_attrstat(struct svc_rqst * rqstp)357 static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp)
358 {
359 struct nfsd_attrstat *resp = rqstp->rq_resp;
360
361 fh_put(&resp->fh);
362 }
363
nfsaclsvc_release_access(struct svc_rqst * rqstp)364 static void nfsaclsvc_release_access(struct svc_rqst *rqstp)
365 {
366 struct nfsd3_accessres *resp = rqstp->rq_resp;
367
368 fh_put(&resp->fh);
369 }
370
371 struct nfsd3_voidargs { int dummy; };
372
373 #define ST 1 /* status*/
374 #define AT 21 /* attributes */
375 #define pAT (1+AT) /* post attributes - conditional */
376 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
377
378 static const struct svc_procedure nfsd_acl_procedures2[5] = {
379 [ACLPROC2_NULL] = {
380 .pc_func = nfsacld_proc_null,
381 .pc_decode = nfsaclsvc_decode_voidarg,
382 .pc_encode = nfsaclsvc_encode_voidres,
383 .pc_argsize = sizeof(struct nfsd3_voidargs),
384 .pc_ressize = sizeof(struct nfsd3_voidargs),
385 .pc_cachetype = RC_NOCACHE,
386 .pc_xdrressize = ST,
387 },
388 [ACLPROC2_GETACL] = {
389 .pc_func = nfsacld_proc_getacl,
390 .pc_decode = nfsaclsvc_decode_getaclargs,
391 .pc_encode = nfsaclsvc_encode_getaclres,
392 .pc_release = nfsaclsvc_release_getacl,
393 .pc_argsize = sizeof(struct nfsd3_getaclargs),
394 .pc_ressize = sizeof(struct nfsd3_getaclres),
395 .pc_cachetype = RC_NOCACHE,
396 .pc_xdrressize = ST+1+2*(1+ACL),
397 },
398 [ACLPROC2_SETACL] = {
399 .pc_func = nfsacld_proc_setacl,
400 .pc_decode = nfsaclsvc_decode_setaclargs,
401 .pc_encode = nfsaclsvc_encode_attrstatres,
402 .pc_release = nfsaclsvc_release_attrstat,
403 .pc_argsize = sizeof(struct nfsd3_setaclargs),
404 .pc_ressize = sizeof(struct nfsd_attrstat),
405 .pc_cachetype = RC_NOCACHE,
406 .pc_xdrressize = ST+AT,
407 },
408 [ACLPROC2_GETATTR] = {
409 .pc_func = nfsacld_proc_getattr,
410 .pc_decode = nfsaclsvc_decode_fhandleargs,
411 .pc_encode = nfsaclsvc_encode_attrstatres,
412 .pc_release = nfsaclsvc_release_attrstat,
413 .pc_argsize = sizeof(struct nfsd_fhandle),
414 .pc_ressize = sizeof(struct nfsd_attrstat),
415 .pc_cachetype = RC_NOCACHE,
416 .pc_xdrressize = ST+AT,
417 },
418 [ACLPROC2_ACCESS] = {
419 .pc_func = nfsacld_proc_access,
420 .pc_decode = nfsaclsvc_decode_accessargs,
421 .pc_encode = nfsaclsvc_encode_accessres,
422 .pc_release = nfsaclsvc_release_access,
423 .pc_argsize = sizeof(struct nfsd3_accessargs),
424 .pc_ressize = sizeof(struct nfsd3_accessres),
425 .pc_cachetype = RC_NOCACHE,
426 .pc_xdrressize = ST+AT+1,
427 },
428 };
429
430 static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)];
431 const struct svc_version nfsd_acl_version2 = {
432 .vs_vers = 2,
433 .vs_nproc = 5,
434 .vs_proc = nfsd_acl_procedures2,
435 .vs_count = nfsd_acl_count2,
436 .vs_dispatch = nfsd_dispatch,
437 .vs_xdrsize = NFS3_SVC_XDRSIZE,
438 };
439