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
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 */
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_inode_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_inode_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 */
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 inode_lock(inode);
115
116 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_ACCESS,
117 argp->acl_access);
118 if (error)
119 goto out_drop_lock;
120 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_DEFAULT,
121 argp->acl_default);
122 if (error)
123 goto out_drop_lock;
124
125 inode_unlock(inode);
126
127 fh_drop_write(fh);
128
129 resp->status = fh_getattr(fh, &resp->stat);
130
131 out:
132 /* argp->acl_{access,default} may have been allocated in
133 nfssvc_decode_setaclargs. */
134 posix_acl_release(argp->acl_access);
135 posix_acl_release(argp->acl_default);
136 return rpc_success;
137
138 out_drop_lock:
139 inode_unlock(inode);
140 fh_drop_write(fh);
141 out_errno:
142 resp->status = nfserrno(error);
143 goto out;
144 }
145
146 /*
147 * Check file attributes
148 */
149 static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)
150 {
151 struct nfsd_fhandle *argp = rqstp->rq_argp;
152 struct nfsd_attrstat *resp = rqstp->rq_resp;
153
154 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
155
156 fh_copy(&resp->fh, &argp->fh);
157 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
158 if (resp->status != nfs_ok)
159 goto out;
160 resp->status = fh_getattr(&resp->fh, &resp->stat);
161 out:
162 return rpc_success;
163 }
164
165 /*
166 * Check file access
167 */
168 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
169 {
170 struct nfsd3_accessargs *argp = rqstp->rq_argp;
171 struct nfsd3_accessres *resp = rqstp->rq_resp;
172
173 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
174 SVCFH_fmt(&argp->fh),
175 argp->access);
176
177 fh_copy(&resp->fh, &argp->fh);
178 resp->access = argp->access;
179 resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
180 if (resp->status != nfs_ok)
181 goto out;
182 resp->status = fh_getattr(&resp->fh, &resp->stat);
183 out:
184 return rpc_success;
185 }
186
187 /*
188 * XDR decode functions
189 */
190
191 static bool
192 nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
193 {
194 struct nfsd3_getaclargs *argp = rqstp->rq_argp;
195
196 if (!svcxdr_decode_fhandle(xdr, &argp->fh))
197 return false;
198 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
199 return false;
200
201 return true;
202 }
203
204 static bool
205 nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
206 {
207 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
208
209 if (!svcxdr_decode_fhandle(xdr, &argp->fh))
210 return false;
211 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
212 return false;
213 if (argp->mask & ~NFS_ACL_MASK)
214 return false;
215 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
216 &argp->acl_access : NULL))
217 return false;
218 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
219 &argp->acl_default : NULL))
220 return false;
221
222 return true;
223 }
224
225 static bool
226 nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
227 {
228 struct nfsd3_accessargs *args = rqstp->rq_argp;
229
230 if (!svcxdr_decode_fhandle(xdr, &args->fh))
231 return false;
232 if (xdr_stream_decode_u32(xdr, &args->access) < 0)
233 return false;
234
235 return true;
236 }
237
238 /*
239 * XDR encode functions
240 */
241
242 /* GETACL */
243 static bool
244 nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
245 {
246 struct nfsd3_getaclres *resp = rqstp->rq_resp;
247 struct dentry *dentry = resp->fh.fh_dentry;
248 struct inode *inode;
249
250 if (!svcxdr_encode_stat(xdr, resp->status))
251 return false;
252
253 if (dentry == NULL || d_really_is_negative(dentry))
254 return true;
255 inode = d_inode(dentry);
256
257 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
258 return false;
259 if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
260 return false;
261
262 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access,
263 resp->mask & NFS_ACL, 0))
264 return false;
265 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default,
266 resp->mask & NFS_DFACL, NFS_ACL_DEFAULT))
267 return false;
268
269 return true;
270 }
271
272 /* ACCESS */
273 static bool
274 nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
275 {
276 struct nfsd3_accessres *resp = rqstp->rq_resp;
277
278 if (!svcxdr_encode_stat(xdr, resp->status))
279 return false;
280 switch (resp->status) {
281 case nfs_ok:
282 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
283 return false;
284 if (xdr_stream_encode_u32(xdr, resp->access) < 0)
285 return false;
286 break;
287 }
288
289 return true;
290 }
291
292 /*
293 * XDR release functions
294 */
295 static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp)
296 {
297 struct nfsd3_getaclres *resp = rqstp->rq_resp;
298
299 fh_put(&resp->fh);
300 posix_acl_release(resp->acl_access);
301 posix_acl_release(resp->acl_default);
302 }
303
304 static void nfsaclsvc_release_access(struct svc_rqst *rqstp)
305 {
306 struct nfsd3_accessres *resp = rqstp->rq_resp;
307
308 fh_put(&resp->fh);
309 }
310
311 #define ST 1 /* status*/
312 #define AT 21 /* attributes */
313 #define pAT (1+AT) /* post attributes - conditional */
314 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
315
316 static const struct svc_procedure nfsd_acl_procedures2[5] = {
317 [ACLPROC2_NULL] = {
318 .pc_func = nfsacld_proc_null,
319 .pc_decode = nfssvc_decode_voidarg,
320 .pc_encode = nfssvc_encode_voidres,
321 .pc_argsize = sizeof(struct nfsd_voidargs),
322 .pc_argzero = sizeof(struct nfsd_voidargs),
323 .pc_ressize = sizeof(struct nfsd_voidres),
324 .pc_cachetype = RC_NOCACHE,
325 .pc_xdrressize = ST,
326 .pc_name = "NULL",
327 },
328 [ACLPROC2_GETACL] = {
329 .pc_func = nfsacld_proc_getacl,
330 .pc_decode = nfsaclsvc_decode_getaclargs,
331 .pc_encode = nfsaclsvc_encode_getaclres,
332 .pc_release = nfsaclsvc_release_getacl,
333 .pc_argsize = sizeof(struct nfsd3_getaclargs),
334 .pc_argzero = sizeof(struct nfsd3_getaclargs),
335 .pc_ressize = sizeof(struct nfsd3_getaclres),
336 .pc_cachetype = RC_NOCACHE,
337 .pc_xdrressize = ST+1+2*(1+ACL),
338 .pc_name = "GETACL",
339 },
340 [ACLPROC2_SETACL] = {
341 .pc_func = nfsacld_proc_setacl,
342 .pc_decode = nfsaclsvc_decode_setaclargs,
343 .pc_encode = nfssvc_encode_attrstatres,
344 .pc_release = nfssvc_release_attrstat,
345 .pc_argsize = sizeof(struct nfsd3_setaclargs),
346 .pc_argzero = sizeof(struct nfsd3_setaclargs),
347 .pc_ressize = sizeof(struct nfsd_attrstat),
348 .pc_cachetype = RC_NOCACHE,
349 .pc_xdrressize = ST+AT,
350 .pc_name = "SETACL",
351 },
352 [ACLPROC2_GETATTR] = {
353 .pc_func = nfsacld_proc_getattr,
354 .pc_decode = nfssvc_decode_fhandleargs,
355 .pc_encode = nfssvc_encode_attrstatres,
356 .pc_release = nfssvc_release_attrstat,
357 .pc_argsize = sizeof(struct nfsd_fhandle),
358 .pc_argzero = sizeof(struct nfsd_fhandle),
359 .pc_ressize = sizeof(struct nfsd_attrstat),
360 .pc_cachetype = RC_NOCACHE,
361 .pc_xdrressize = ST+AT,
362 .pc_name = "GETATTR",
363 },
364 [ACLPROC2_ACCESS] = {
365 .pc_func = nfsacld_proc_access,
366 .pc_decode = nfsaclsvc_decode_accessargs,
367 .pc_encode = nfsaclsvc_encode_accessres,
368 .pc_release = nfsaclsvc_release_access,
369 .pc_argsize = sizeof(struct nfsd3_accessargs),
370 .pc_argzero = sizeof(struct nfsd3_accessargs),
371 .pc_ressize = sizeof(struct nfsd3_accessres),
372 .pc_cachetype = RC_NOCACHE,
373 .pc_xdrressize = ST+AT+1,
374 .pc_name = "SETATTR",
375 },
376 };
377
378 static DEFINE_PER_CPU_ALIGNED(unsigned long,
379 nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)]);
380 const struct svc_version nfsd_acl_version2 = {
381 .vs_vers = 2,
382 .vs_nproc = ARRAY_SIZE(nfsd_acl_procedures2),
383 .vs_proc = nfsd_acl_procedures2,
384 .vs_count = nfsd_acl_count2,
385 .vs_dispatch = nfsd_dispatch,
386 .vs_xdrsize = NFS3_SVC_XDRSIZE,
387 };
388
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.