xref: /openbmc/linux/fs/nfsd/nfs2acl.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
1 /*
2  * linux/fs/nfsd/nfs2acl.c
3  *
4  * Process version 2 NFSACL requests.
5  *
6  * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
7  */
8 
9 #include <linux/sunrpc/svc.h>
10 #include <linux/nfs.h>
11 #include <linux/nfsd/nfsd.h>
12 #include <linux/nfsd/cache.h>
13 #include <linux/nfsd/xdr.h>
14 #include <linux/nfsd/xdr3.h>
15 #include <linux/posix_acl.h>
16 #include <linux/nfsacl.h>
17 
18 #define NFSDDBG_FACILITY		NFSDDBG_PROC
19 #define RETURN_STATUS(st)	{ resp->status = (st); return (st); }
20 
21 /*
22  * NULL call.
23  */
24 static __be32
25 nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
26 {
27 	return nfs_ok;
28 }
29 
30 /*
31  * Get the Access and/or Default ACL of a file.
32  */
33 static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
34 		struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
35 {
36 	svc_fh *fh;
37 	struct posix_acl *acl;
38 	__be32 nfserr = 0;
39 
40 	dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
41 
42 	fh = fh_copy(&resp->fh, &argp->fh);
43 	if ((nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP)))
44 		RETURN_STATUS(nfserr_inval);
45 
46 	if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
47 		RETURN_STATUS(nfserr_inval);
48 	resp->mask = argp->mask;
49 
50 	if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
51 		acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
52 		if (IS_ERR(acl)) {
53 			int err = PTR_ERR(acl);
54 
55 			if (err == -ENODATA || err == -EOPNOTSUPP)
56 				acl = NULL;
57 			else {
58 				nfserr = nfserrno(err);
59 				goto fail;
60 			}
61 		}
62 		if (acl == NULL) {
63 			/* Solaris returns the inode's minimum ACL. */
64 
65 			struct inode *inode = fh->fh_dentry->d_inode;
66 			acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
67 		}
68 		resp->acl_access = acl;
69 	}
70 	if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
71 		/* Check how Solaris handles requests for the Default ACL
72 		   of a non-directory! */
73 
74 		acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
75 		if (IS_ERR(acl)) {
76 			int err = PTR_ERR(acl);
77 
78 			if (err == -ENODATA || err == -EOPNOTSUPP)
79 				acl = NULL;
80 			else {
81 				nfserr = nfserrno(err);
82 				goto fail;
83 			}
84 		}
85 		resp->acl_default = acl;
86 	}
87 
88 	/* resp->acl_{access,default} are released in nfssvc_release_getacl. */
89 	RETURN_STATUS(0);
90 
91 fail:
92 	posix_acl_release(resp->acl_access);
93 	posix_acl_release(resp->acl_default);
94 	RETURN_STATUS(nfserr);
95 }
96 
97 /*
98  * Set the Access and/or Default ACL of a file.
99  */
100 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
101 		struct nfsd3_setaclargs *argp,
102 		struct nfsd_attrstat *resp)
103 {
104 	svc_fh *fh;
105 	__be32 nfserr = 0;
106 
107 	dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
108 
109 	fh = fh_copy(&resp->fh, &argp->fh);
110 	nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_SATTR);
111 
112 	if (!nfserr) {
113 		nfserr = nfserrno( nfsd_set_posix_acl(
114 			fh, ACL_TYPE_ACCESS, argp->acl_access) );
115 	}
116 	if (!nfserr) {
117 		nfserr = nfserrno( nfsd_set_posix_acl(
118 			fh, ACL_TYPE_DEFAULT, argp->acl_default) );
119 	}
120 
121 	/* argp->acl_{access,default} may have been allocated in
122 	   nfssvc_decode_setaclargs. */
123 	posix_acl_release(argp->acl_access);
124 	posix_acl_release(argp->acl_default);
125 	return nfserr;
126 }
127 
128 /*
129  * Check file attributes
130  */
131 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
132 		struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
133 {
134 	dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
135 
136 	fh_copy(&resp->fh, &argp->fh);
137 	return fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
138 }
139 
140 /*
141  * Check file access
142  */
143 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
144 		struct nfsd3_accessres *resp)
145 {
146 	__be32 nfserr;
147 
148 	dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
149 			SVCFH_fmt(&argp->fh),
150 			argp->access);
151 
152 	fh_copy(&resp->fh, &argp->fh);
153 	resp->access = argp->access;
154 	nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
155 	return nfserr;
156 }
157 
158 /*
159  * XDR decode functions
160  */
161 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
162 		struct nfsd3_getaclargs *argp)
163 {
164 	if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
165 		return 0;
166 	argp->mask = ntohl(*p); p++;
167 
168 	return xdr_argsize_check(rqstp, p);
169 }
170 
171 
172 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
173 		struct nfsd3_setaclargs *argp)
174 {
175 	struct kvec *head = rqstp->rq_arg.head;
176 	unsigned int base;
177 	int n;
178 
179 	if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
180 		return 0;
181 	argp->mask = ntohl(*p++);
182 	if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
183 	    !xdr_argsize_check(rqstp, p))
184 		return 0;
185 
186 	base = (char *)p - (char *)head->iov_base;
187 	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
188 			  (argp->mask & NFS_ACL) ?
189 			  &argp->acl_access : NULL);
190 	if (n > 0)
191 		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
192 				  (argp->mask & NFS_DFACL) ?
193 				  &argp->acl_default : NULL);
194 	return (n > 0);
195 }
196 
197 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
198 		struct nfsd_fhandle *argp)
199 {
200 	if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
201 		return 0;
202 	return xdr_argsize_check(rqstp, p);
203 }
204 
205 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
206 		struct nfsd3_accessargs *argp)
207 {
208 	if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
209 		return 0;
210 	argp->access = ntohl(*p++);
211 
212 	return xdr_argsize_check(rqstp, p);
213 }
214 
215 /*
216  * XDR encode functions
217  */
218 
219 /* GETACL */
220 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
221 		struct nfsd3_getaclres *resp)
222 {
223 	struct dentry *dentry = resp->fh.fh_dentry;
224 	struct inode *inode = dentry->d_inode;
225 	struct kvec *head = rqstp->rq_res.head;
226 	unsigned int base;
227 	int n;
228 	int w;
229 
230 	if (dentry == NULL || dentry->d_inode == NULL)
231 		return 0;
232 	inode = dentry->d_inode;
233 
234 	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
235 	*p++ = htonl(resp->mask);
236 	if (!xdr_ressize_check(rqstp, p))
237 		return 0;
238 	base = (char *)p - (char *)head->iov_base;
239 
240 	rqstp->rq_res.page_len = w = nfsacl_size(
241 		(resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
242 		(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
243 	while (w > 0) {
244 		if (!rqstp->rq_respages[rqstp->rq_resused++])
245 			return 0;
246 		w -= PAGE_SIZE;
247 	}
248 
249 	n = nfsacl_encode(&rqstp->rq_res, base, inode,
250 			  resp->acl_access,
251 			  resp->mask & NFS_ACL, 0);
252 	if (n > 0)
253 		n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
254 				  resp->acl_default,
255 				  resp->mask & NFS_DFACL,
256 				  NFS_ACL_DEFAULT);
257 	if (n <= 0)
258 		return 0;
259 	return 1;
260 }
261 
262 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
263 		struct nfsd_attrstat *resp)
264 {
265 	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
266 	return xdr_ressize_check(rqstp, p);
267 }
268 
269 /* ACCESS */
270 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
271 		struct nfsd3_accessres *resp)
272 {
273 	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
274 	*p++ = htonl(resp->access);
275 	return xdr_ressize_check(rqstp, p);
276 }
277 
278 /*
279  * XDR release functions
280  */
281 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
282 		struct nfsd3_getaclres *resp)
283 {
284 	fh_put(&resp->fh);
285 	posix_acl_release(resp->acl_access);
286 	posix_acl_release(resp->acl_default);
287 	return 1;
288 }
289 
290 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
291 		struct nfsd_attrstat *resp)
292 {
293 	fh_put(&resp->fh);
294 	return 1;
295 }
296 
297 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
298                struct nfsd3_accessres *resp)
299 {
300        fh_put(&resp->fh);
301        return 1;
302 }
303 
304 #define nfsaclsvc_decode_voidargs	NULL
305 #define nfsaclsvc_encode_voidres	NULL
306 #define nfsaclsvc_release_void		NULL
307 #define nfsd3_fhandleargs	nfsd_fhandle
308 #define nfsd3_attrstatres	nfsd_attrstat
309 #define nfsd3_voidres		nfsd3_voidargs
310 struct nfsd3_voidargs { int dummy; };
311 
312 #define PROC(name, argt, rest, relt, cache, respsize)	\
313  { (svc_procfunc) nfsacld_proc_##name,		\
314    (kxdrproc_t) nfsaclsvc_decode_##argt##args,	\
315    (kxdrproc_t) nfsaclsvc_encode_##rest##res,	\
316    (kxdrproc_t) nfsaclsvc_release_##relt,		\
317    sizeof(struct nfsd3_##argt##args),		\
318    sizeof(struct nfsd3_##rest##res),		\
319    0,						\
320    cache,					\
321    respsize,					\
322  }
323 
324 #define ST 1		/* status*/
325 #define AT 21		/* attributes */
326 #define pAT (1+AT)	/* post attributes - conditional */
327 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
328 
329 static struct svc_procedure		nfsd_acl_procedures2[] = {
330   PROC(null,	void,		void,		void,	  RC_NOCACHE, ST),
331   PROC(getacl,	getacl,		getacl,		getacl,	  RC_NOCACHE, ST+1+2*(1+ACL)),
332   PROC(setacl,	setacl,		attrstat,	attrstat, RC_NOCACHE, ST+AT),
333   PROC(getattr, fhandle,	attrstat,	attrstat, RC_NOCACHE, ST+AT),
334   PROC(access,	access,		access,		access,   RC_NOCACHE, ST+AT+1),
335 };
336 
337 struct svc_version	nfsd_acl_version2 = {
338 		.vs_vers	= 2,
339 		.vs_nproc	= 5,
340 		.vs_proc	= nfsd_acl_procedures2,
341 		.vs_dispatch	= nfsd_dispatch,
342 		.vs_xdrsize	= NFS3_SVC_XDRSIZE,
343 		.vs_hidden	= 1,
344 };
345