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 */
21static __be32
22nfsacld_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 */
30static __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. */
81out:
82	return rpc_success;
83
84fail:
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 */
93static __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
131out:
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
138out_drop_lock:
139	inode_unlock(inode);
140	fh_drop_write(fh);
141out_errno:
142	resp->status = nfserrno(error);
143	goto out;
144}
145
146/*
147 * Check file attributes
148 */
149static __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);
161out:
162	return rpc_success;
163}
164
165/*
166 * Check file access
167 */
168static __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);
183out:
184	return rpc_success;
185}
186
187/*
188 * XDR decode functions
189 */
190
191static bool
192nfsaclsvc_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
204static bool
205nfsaclsvc_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
225static bool
226nfsaclsvc_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 */
243static bool
244nfsaclsvc_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 */
273static bool
274nfsaclsvc_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 */
295static 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
304static 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
311struct nfsd3_voidargs { int dummy; };
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
318static 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
380static DEFINE_PER_CPU_ALIGNED(unsigned long,
381			      nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)]);
382const 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