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_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 resp->acl_access = NULL;
88 resp->acl_default = NULL;
89 goto out;
90 }
91
92 /*
93 * Set the Access and/or Default ACL of a file.
94 */
nfsacld_proc_setacl(struct svc_rqst * rqstp)95 static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp)
96 {
97 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
98 struct nfsd_attrstat *resp = rqstp->rq_resp;
99 struct inode *inode;
100 svc_fh *fh;
101 int error;
102
103 dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
104
105 fh = fh_copy(&resp->fh, &argp->fh);
106 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
107 if (resp->status != nfs_ok)
108 goto out;
109
110 inode = d_inode(fh->fh_dentry);
111
112 error = fh_want_write(fh);
113 if (error)
114 goto out_errno;
115
116 inode_lock(inode);
117
118 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_ACCESS,
119 argp->acl_access);
120 if (error)
121 goto out_drop_lock;
122 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_DEFAULT,
123 argp->acl_default);
124 if (error)
125 goto out_drop_lock;
126
127 inode_unlock(inode);
128
129 fh_drop_write(fh);
130
131 resp->status = fh_getattr(fh, &resp->stat);
132
133 out:
134 /* argp->acl_{access,default} may have been allocated in
135 nfssvc_decode_setaclargs. */
136 posix_acl_release(argp->acl_access);
137 posix_acl_release(argp->acl_default);
138 return rpc_success;
139
140 out_drop_lock:
141 inode_unlock(inode);
142 fh_drop_write(fh);
143 out_errno:
144 resp->status = nfserrno(error);
145 goto out;
146 }
147
148 /*
149 * Check file attributes
150 */
nfsacld_proc_getattr(struct svc_rqst * rqstp)151 static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)
152 {
153 struct nfsd_fhandle *argp = rqstp->rq_argp;
154 struct nfsd_attrstat *resp = rqstp->rq_resp;
155
156 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
157
158 fh_copy(&resp->fh, &argp->fh);
159 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
160 if (resp->status != nfs_ok)
161 goto out;
162 resp->status = fh_getattr(&resp->fh, &resp->stat);
163 out:
164 return rpc_success;
165 }
166
167 /*
168 * Check file access
169 */
nfsacld_proc_access(struct svc_rqst * rqstp)170 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
171 {
172 struct nfsd3_accessargs *argp = rqstp->rq_argp;
173 struct nfsd3_accessres *resp = rqstp->rq_resp;
174
175 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
176 SVCFH_fmt(&argp->fh),
177 argp->access);
178
179 fh_copy(&resp->fh, &argp->fh);
180 resp->access = argp->access;
181 resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
182 if (resp->status != nfs_ok)
183 goto out;
184 resp->status = fh_getattr(&resp->fh, &resp->stat);
185 out:
186 return rpc_success;
187 }
188
189 /*
190 * XDR decode functions
191 */
192
193 static bool
nfsaclsvc_decode_getaclargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)194 nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
195 {
196 struct nfsd3_getaclargs *argp = rqstp->rq_argp;
197
198 if (!svcxdr_decode_fhandle(xdr, &argp->fh))
199 return false;
200 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
201 return false;
202
203 return true;
204 }
205
206 static bool
nfsaclsvc_decode_setaclargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)207 nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
208 {
209 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
210
211 if (!svcxdr_decode_fhandle(xdr, &argp->fh))
212 return false;
213 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
214 return false;
215 if (argp->mask & ~NFS_ACL_MASK)
216 return false;
217 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
218 &argp->acl_access : NULL))
219 return false;
220 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
221 &argp->acl_default : NULL))
222 return false;
223
224 return true;
225 }
226
227 static bool
nfsaclsvc_decode_accessargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)228 nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
229 {
230 struct nfsd3_accessargs *args = rqstp->rq_argp;
231
232 if (!svcxdr_decode_fhandle(xdr, &args->fh))
233 return false;
234 if (xdr_stream_decode_u32(xdr, &args->access) < 0)
235 return false;
236
237 return true;
238 }
239
240 /*
241 * XDR encode functions
242 */
243
244 /* GETACL */
245 static bool
nfsaclsvc_encode_getaclres(struct svc_rqst * rqstp,struct xdr_stream * xdr)246 nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
247 {
248 struct nfsd3_getaclres *resp = rqstp->rq_resp;
249 struct dentry *dentry = resp->fh.fh_dentry;
250 struct inode *inode;
251
252 if (!svcxdr_encode_stat(xdr, resp->status))
253 return false;
254
255 if (dentry == NULL || d_really_is_negative(dentry))
256 return true;
257 inode = d_inode(dentry);
258
259 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
260 return false;
261 if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
262 return false;
263
264 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access,
265 resp->mask & NFS_ACL, 0))
266 return false;
267 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default,
268 resp->mask & NFS_DFACL, NFS_ACL_DEFAULT))
269 return false;
270
271 return true;
272 }
273
274 /* ACCESS */
275 static bool
nfsaclsvc_encode_accessres(struct svc_rqst * rqstp,struct xdr_stream * xdr)276 nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
277 {
278 struct nfsd3_accessres *resp = rqstp->rq_resp;
279
280 if (!svcxdr_encode_stat(xdr, resp->status))
281 return false;
282 switch (resp->status) {
283 case nfs_ok:
284 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
285 return false;
286 if (xdr_stream_encode_u32(xdr, resp->access) < 0)
287 return false;
288 break;
289 }
290
291 return true;
292 }
293
294 /*
295 * XDR release functions
296 */
nfsaclsvc_release_getacl(struct svc_rqst * rqstp)297 static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp)
298 {
299 struct nfsd3_getaclres *resp = rqstp->rq_resp;
300
301 fh_put(&resp->fh);
302 posix_acl_release(resp->acl_access);
303 posix_acl_release(resp->acl_default);
304 }
305
nfsaclsvc_release_access(struct svc_rqst * rqstp)306 static void nfsaclsvc_release_access(struct svc_rqst *rqstp)
307 {
308 struct nfsd3_accessres *resp = rqstp->rq_resp;
309
310 fh_put(&resp->fh);
311 }
312
313 #define ST 1 /* status*/
314 #define AT 21 /* attributes */
315 #define pAT (1+AT) /* post attributes - conditional */
316 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
317
318 static const struct svc_procedure nfsd_acl_procedures2[5] = {
319 [ACLPROC2_NULL] = {
320 .pc_func = nfsacld_proc_null,
321 .pc_decode = nfssvc_decode_voidarg,
322 .pc_encode = nfssvc_encode_voidres,
323 .pc_argsize = sizeof(struct nfsd_voidargs),
324 .pc_argzero = sizeof(struct nfsd_voidargs),
325 .pc_ressize = sizeof(struct nfsd_voidres),
326 .pc_cachetype = RC_NOCACHE,
327 .pc_xdrressize = ST,
328 .pc_name = "NULL",
329 },
330 [ACLPROC2_GETACL] = {
331 .pc_func = nfsacld_proc_getacl,
332 .pc_decode = nfsaclsvc_decode_getaclargs,
333 .pc_encode = nfsaclsvc_encode_getaclres,
334 .pc_release = nfsaclsvc_release_getacl,
335 .pc_argsize = sizeof(struct nfsd3_getaclargs),
336 .pc_argzero = sizeof(struct nfsd3_getaclargs),
337 .pc_ressize = sizeof(struct nfsd3_getaclres),
338 .pc_cachetype = RC_NOCACHE,
339 .pc_xdrressize = ST+1+2*(1+ACL),
340 .pc_name = "GETACL",
341 },
342 [ACLPROC2_SETACL] = {
343 .pc_func = nfsacld_proc_setacl,
344 .pc_decode = nfsaclsvc_decode_setaclargs,
345 .pc_encode = nfssvc_encode_attrstatres,
346 .pc_release = nfssvc_release_attrstat,
347 .pc_argsize = sizeof(struct nfsd3_setaclargs),
348 .pc_argzero = sizeof(struct nfsd3_setaclargs),
349 .pc_ressize = sizeof(struct nfsd_attrstat),
350 .pc_cachetype = RC_NOCACHE,
351 .pc_xdrressize = ST+AT,
352 .pc_name = "SETACL",
353 },
354 [ACLPROC2_GETATTR] = {
355 .pc_func = nfsacld_proc_getattr,
356 .pc_decode = nfssvc_decode_fhandleargs,
357 .pc_encode = nfssvc_encode_attrstatres,
358 .pc_release = nfssvc_release_attrstat,
359 .pc_argsize = sizeof(struct nfsd_fhandle),
360 .pc_argzero = sizeof(struct nfsd_fhandle),
361 .pc_ressize = sizeof(struct nfsd_attrstat),
362 .pc_cachetype = RC_NOCACHE,
363 .pc_xdrressize = ST+AT,
364 .pc_name = "GETATTR",
365 },
366 [ACLPROC2_ACCESS] = {
367 .pc_func = nfsacld_proc_access,
368 .pc_decode = nfsaclsvc_decode_accessargs,
369 .pc_encode = nfsaclsvc_encode_accessres,
370 .pc_release = nfsaclsvc_release_access,
371 .pc_argsize = sizeof(struct nfsd3_accessargs),
372 .pc_argzero = sizeof(struct nfsd3_accessargs),
373 .pc_ressize = sizeof(struct nfsd3_accessres),
374 .pc_cachetype = RC_NOCACHE,
375 .pc_xdrressize = ST+AT+1,
376 .pc_name = "SETATTR",
377 },
378 };
379
380 static DEFINE_PER_CPU_ALIGNED(unsigned long,
381 nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)]);
382 const struct svc_version nfsd_acl_version2 = {
383 .vs_vers = 2,
384 .vs_nproc = ARRAY_SIZE(nfsd_acl_procedures2),
385 .vs_proc = nfsd_acl_procedures2,
386 .vs_count = nfsd_acl_count2,
387 .vs_dispatch = nfsd_dispatch,
388 .vs_xdrsize = NFS3_SVC_XDRSIZE,
389 };
390