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_inode_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_inode_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 resp->acl_access = NULL;
80 resp->acl_default = NULL;
81 goto out;
82 }
83
84 /*
85 * Set the Access and/or Default ACL of a file.
86 */
nfsd3_proc_setacl(struct svc_rqst * rqstp)87 static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
88 {
89 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
90 struct nfsd3_attrstat *resp = rqstp->rq_resp;
91 struct inode *inode;
92 svc_fh *fh;
93 int error;
94
95 fh = fh_copy(&resp->fh, &argp->fh);
96 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
97 if (resp->status != nfs_ok)
98 goto out;
99
100 inode = d_inode(fh->fh_dentry);
101
102 error = fh_want_write(fh);
103 if (error)
104 goto out_errno;
105
106 inode_lock(inode);
107
108 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_ACCESS,
109 argp->acl_access);
110 if (error)
111 goto out_drop_lock;
112 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_DEFAULT,
113 argp->acl_default);
114
115 out_drop_lock:
116 inode_unlock(inode);
117 fh_drop_write(fh);
118 out_errno:
119 resp->status = nfserrno(error);
120 out:
121 /* argp->acl_{access,default} may have been allocated in
122 nfs3svc_decode_setaclargs. */
123 posix_acl_release(argp->acl_access);
124 posix_acl_release(argp->acl_default);
125 return rpc_success;
126 }
127
128 /*
129 * XDR decode functions
130 */
131
132 static bool
nfs3svc_decode_getaclargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)133 nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
134 {
135 struct nfsd3_getaclargs *args = rqstp->rq_argp;
136
137 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
138 return false;
139 if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
140 return false;
141
142 return true;
143 }
144
145 static bool
nfs3svc_decode_setaclargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)146 nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
147 {
148 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
149
150 if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
151 return false;
152 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
153 return false;
154 if (argp->mask & ~NFS_ACL_MASK)
155 return false;
156 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
157 &argp->acl_access : NULL))
158 return false;
159 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
160 &argp->acl_default : NULL))
161 return false;
162
163 return true;
164 }
165
166 /*
167 * XDR encode functions
168 */
169
170 /* GETACL */
171 static bool
nfs3svc_encode_getaclres(struct svc_rqst * rqstp,struct xdr_stream * xdr)172 nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
173 {
174 struct nfsd3_getaclres *resp = rqstp->rq_resp;
175 struct dentry *dentry = resp->fh.fh_dentry;
176 struct inode *inode;
177
178 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
179 return false;
180 switch (resp->status) {
181 case nfs_ok:
182 inode = d_inode(dentry);
183 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
184 return false;
185 if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
186 return false;
187
188 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access,
189 resp->mask & NFS_ACL, 0))
190 return false;
191 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default,
192 resp->mask & NFS_DFACL,
193 NFS_ACL_DEFAULT))
194 return false;
195 break;
196 default:
197 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
198 return false;
199 }
200
201 return true;
202 }
203
204 /* SETACL */
205 static bool
nfs3svc_encode_setaclres(struct svc_rqst * rqstp,struct xdr_stream * xdr)206 nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
207 {
208 struct nfsd3_attrstat *resp = rqstp->rq_resp;
209
210 return svcxdr_encode_nfsstat3(xdr, resp->status) &&
211 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
212 }
213
214 /*
215 * XDR release functions
216 */
nfs3svc_release_getacl(struct svc_rqst * rqstp)217 static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
218 {
219 struct nfsd3_getaclres *resp = rqstp->rq_resp;
220
221 fh_put(&resp->fh);
222 posix_acl_release(resp->acl_access);
223 posix_acl_release(resp->acl_default);
224 }
225
226 #define ST 1 /* status*/
227 #define AT 21 /* attributes */
228 #define pAT (1+AT) /* post attributes - conditional */
229 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
230
231 static const struct svc_procedure nfsd_acl_procedures3[3] = {
232 [ACLPROC3_NULL] = {
233 .pc_func = nfsd3_proc_null,
234 .pc_decode = nfssvc_decode_voidarg,
235 .pc_encode = nfssvc_encode_voidres,
236 .pc_argsize = sizeof(struct nfsd_voidargs),
237 .pc_argzero = sizeof(struct nfsd_voidargs),
238 .pc_ressize = sizeof(struct nfsd_voidres),
239 .pc_cachetype = RC_NOCACHE,
240 .pc_xdrressize = ST,
241 .pc_name = "NULL",
242 },
243 [ACLPROC3_GETACL] = {
244 .pc_func = nfsd3_proc_getacl,
245 .pc_decode = nfs3svc_decode_getaclargs,
246 .pc_encode = nfs3svc_encode_getaclres,
247 .pc_release = nfs3svc_release_getacl,
248 .pc_argsize = sizeof(struct nfsd3_getaclargs),
249 .pc_argzero = sizeof(struct nfsd3_getaclargs),
250 .pc_ressize = sizeof(struct nfsd3_getaclres),
251 .pc_cachetype = RC_NOCACHE,
252 .pc_xdrressize = ST+1+2*(1+ACL),
253 .pc_name = "GETACL",
254 },
255 [ACLPROC3_SETACL] = {
256 .pc_func = nfsd3_proc_setacl,
257 .pc_decode = nfs3svc_decode_setaclargs,
258 .pc_encode = nfs3svc_encode_setaclres,
259 .pc_release = nfs3svc_release_fhandle,
260 .pc_argsize = sizeof(struct nfsd3_setaclargs),
261 .pc_argzero = sizeof(struct nfsd3_setaclargs),
262 .pc_ressize = sizeof(struct nfsd3_attrstat),
263 .pc_cachetype = RC_NOCACHE,
264 .pc_xdrressize = ST+pAT,
265 .pc_name = "SETACL",
266 },
267 };
268
269 static DEFINE_PER_CPU_ALIGNED(unsigned long,
270 nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]);
271 const struct svc_version nfsd_acl_version3 = {
272 .vs_vers = 3,
273 .vs_nproc = ARRAY_SIZE(nfsd_acl_procedures3),
274 .vs_proc = nfsd_acl_procedures3,
275 .vs_count = nfsd_acl_count3,
276 .vs_dispatch = nfsd_dispatch,
277 .vs_xdrsize = NFS3_SVC_XDRSIZE,
278 };
279
280