nfs2acl.c

  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_io;
 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	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 */
 95static __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
133out:
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
140out_drop_lock:
141	inode_unlock(inode);
142	fh_drop_write(fh);
143out_errno:
144	resp->status = nfserrno(error);
145	goto out;
146}
147
148/*
149 * Check file attributes
150 */
151static __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);
163out:
164	return rpc_success;
165}
166
167/*
168 * Check file access
169 */
170static __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);
185out:
186	return rpc_success;
187}
188
189/*
190 * XDR decode functions
191 */
192
193static bool
194nfsaclsvc_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
206static bool
207nfsaclsvc_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
227static bool
228nfsaclsvc_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 */
245static bool
246nfsaclsvc_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 */
275static bool
276nfsaclsvc_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 */
297static 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
306static 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
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};