1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Process version 3 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 /*
17 * NULL call.
18 */
19 static __be32
nfsd3_proc_null(struct svc_rqst * rqstp)20 nfsd3_proc_null(struct svc_rqst *rqstp)
21 {
22 return rpc_success;
23 }
24
25 /*
26 * Get the Access and/or Default ACL of a file.
27 */
nfsd3_proc_getacl(struct svc_rqst * rqstp)28 static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp)
29 {
30 struct nfsd3_getaclargs *argp = rqstp->rq_argp;
31 struct nfsd3_getaclres *resp = rqstp->rq_resp;
32 struct posix_acl *acl;
33 struct inode *inode;
34 svc_fh *fh;
35
36 fh = fh_copy(&resp->fh, &argp->fh);
37 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
38 if (resp->status != nfs_ok)
39 goto out;
40
41 inode = d_inode(fh->fh_dentry);
42
43 if (argp->mask & ~NFS_ACL_MASK) {
44 resp->status = nfserr_inval;
45 goto out;
46 }
47 resp->mask = argp->mask;
48
49 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
50 acl = get_acl(inode, ACL_TYPE_ACCESS);
51 if (acl == NULL) {
52 /* Solaris returns the inode's minimum ACL. */
53 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
54 }
55 if (IS_ERR(acl)) {
56 resp->status = nfserrno(PTR_ERR(acl));
57 goto fail;
58 }
59 resp->acl_access = acl;
60 }
61 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
62 /* Check how Solaris handles requests for the Default ACL
63 of a non-directory! */
64 acl = get_acl(inode, ACL_TYPE_DEFAULT);
65 if (IS_ERR(acl)) {
66 resp->status = nfserrno(PTR_ERR(acl));
67 goto fail;
68 }
69 resp->acl_default = acl;
70 }
71
72 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
73 out:
74 return rpc_success;
75
76 fail:
77 posix_acl_release(resp->acl_access);
78 posix_acl_release(resp->acl_default);
79 goto out;
80 }
81
82 /*
83 * Set the Access and/or Default ACL of a file.
84 */
nfsd3_proc_setacl(struct svc_rqst * rqstp)85 static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
86 {
87 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
88 struct nfsd3_attrstat *resp = rqstp->rq_resp;
89 struct inode *inode;
90 svc_fh *fh;
91 int error;
92
93 fh = fh_copy(&resp->fh, &argp->fh);
94 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
95 if (resp->status != nfs_ok)
96 goto out;
97
98 inode = d_inode(fh->fh_dentry);
99
100 error = fh_want_write(fh);
101 if (error)
102 goto out_errno;
103
104 fh_lock(fh);
105
106 error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS,
107 argp->acl_access);
108 if (error)
109 goto out_drop_lock;
110 error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT,
111 argp->acl_default);
112
113 out_drop_lock:
114 fh_unlock(fh);
115 fh_drop_write(fh);
116 out_errno:
117 resp->status = nfserrno(error);
118 out:
119 /* argp->acl_{access,default} may have been allocated in
120 nfs3svc_decode_setaclargs. */
121 posix_acl_release(argp->acl_access);
122 posix_acl_release(argp->acl_default);
123 return rpc_success;
124 }
125
126 /*
127 * XDR decode functions
128 */
129
nfs3svc_decode_getaclargs(struct svc_rqst * rqstp,__be32 * p)130 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
131 {
132 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
133 struct nfsd3_getaclargs *args = rqstp->rq_argp;
134
135 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
136 return 0;
137 if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
138 return 0;
139
140 return 1;
141 }
142
nfs3svc_decode_setaclargs(struct svc_rqst * rqstp,__be32 * p)143 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
144 {
145 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
146 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
147
148 if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
149 return 0;
150 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
151 return 0;
152 if (argp->mask & ~NFS_ACL_MASK)
153 return 0;
154 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
155 &argp->acl_access : NULL))
156 return 0;
157 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
158 &argp->acl_default : NULL))
159 return 0;
160
161 return 1;
162 }
163
164 /*
165 * XDR encode functions
166 */
167
168 /* GETACL */
nfs3svc_encode_getaclres(struct svc_rqst * rqstp,__be32 * p)169 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
170 {
171 struct xdr_stream *xdr = &rqstp->rq_res_stream;
172 struct nfsd3_getaclres *resp = rqstp->rq_resp;
173 struct dentry *dentry = resp->fh.fh_dentry;
174 struct kvec *head = rqstp->rq_res.head;
175 struct inode *inode;
176 unsigned int base;
177 int n;
178 int w;
179
180 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
181 return 0;
182 switch (resp->status) {
183 case nfs_ok:
184 inode = d_inode(dentry);
185 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
186 return 0;
187 if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
188 return 0;
189
190 base = (char *)xdr->p - (char *)head->iov_base;
191
192 rqstp->rq_res.page_len = w = nfsacl_size(
193 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
194 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
195 while (w > 0) {
196 if (!*(rqstp->rq_next_page++))
197 return 0;
198 w -= PAGE_SIZE;
199 }
200
201 n = nfsacl_encode(&rqstp->rq_res, base, inode,
202 resp->acl_access,
203 resp->mask & NFS_ACL, 0);
204 if (n > 0)
205 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
206 resp->acl_default,
207 resp->mask & NFS_DFACL,
208 NFS_ACL_DEFAULT);
209 if (n <= 0)
210 return 0;
211 break;
212 default:
213 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
214 return 0;
215 }
216
217 return 1;
218 }
219
220 /* SETACL */
nfs3svc_encode_setaclres(struct svc_rqst * rqstp,__be32 * p)221 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p)
222 {
223 struct xdr_stream *xdr = &rqstp->rq_res_stream;
224 struct nfsd3_attrstat *resp = rqstp->rq_resp;
225
226 return svcxdr_encode_nfsstat3(xdr, resp->status) &&
227 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
228 }
229
230 /*
231 * XDR release functions
232 */
nfs3svc_release_getacl(struct svc_rqst * rqstp)233 static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
234 {
235 struct nfsd3_getaclres *resp = rqstp->rq_resp;
236
237 fh_put(&resp->fh);
238 posix_acl_release(resp->acl_access);
239 posix_acl_release(resp->acl_default);
240 }
241
242 struct nfsd3_voidargs { int dummy; };
243
244 #define ST 1 /* status*/
245 #define AT 21 /* attributes */
246 #define pAT (1+AT) /* post attributes - conditional */
247 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
248
249 static const struct svc_procedure nfsd_acl_procedures3[3] = {
250 [ACLPROC3_NULL] = {
251 .pc_func = nfsd3_proc_null,
252 .pc_decode = nfssvc_decode_voidarg,
253 .pc_encode = nfssvc_encode_voidres,
254 .pc_argsize = sizeof(struct nfsd_voidargs),
255 .pc_ressize = sizeof(struct nfsd_voidres),
256 .pc_cachetype = RC_NOCACHE,
257 .pc_xdrressize = ST,
258 .pc_name = "NULL",
259 },
260 [ACLPROC3_GETACL] = {
261 .pc_func = nfsd3_proc_getacl,
262 .pc_decode = nfs3svc_decode_getaclargs,
263 .pc_encode = nfs3svc_encode_getaclres,
264 .pc_release = nfs3svc_release_getacl,
265 .pc_argsize = sizeof(struct nfsd3_getaclargs),
266 .pc_ressize = sizeof(struct nfsd3_getaclres),
267 .pc_cachetype = RC_NOCACHE,
268 .pc_xdrressize = ST+1+2*(1+ACL),
269 .pc_name = "GETACL",
270 },
271 [ACLPROC3_SETACL] = {
272 .pc_func = nfsd3_proc_setacl,
273 .pc_decode = nfs3svc_decode_setaclargs,
274 .pc_encode = nfs3svc_encode_setaclres,
275 .pc_release = nfs3svc_release_fhandle,
276 .pc_argsize = sizeof(struct nfsd3_setaclargs),
277 .pc_ressize = sizeof(struct nfsd3_attrstat),
278 .pc_cachetype = RC_NOCACHE,
279 .pc_xdrressize = ST+pAT,
280 .pc_name = "SETACL",
281 },
282 };
283
284 static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
285 const struct svc_version nfsd_acl_version3 = {
286 .vs_vers = 3,
287 .vs_nproc = 3,
288 .vs_proc = nfsd_acl_procedures3,
289 .vs_count = nfsd_acl_count3,
290 .vs_dispatch = nfsd_dispatch,
291 .vs_xdrsize = NFS3_SVC_XDRSIZE,
292 };
293
294
