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); 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; 225 struct kvec *head = rqstp->rq_res.head; 226 unsigned int base; 227 int n; 228 int w; 229 230 /* 231 * Since this is version 2, the check for nfserr in 232 * nfsd_dispatch actually ensures the following cannot happen. 233 * However, it seems fragile to depend on that. 234 */ 235 if (dentry == NULL || dentry->d_inode == NULL) 236 return 0; 237 inode = dentry->d_inode; 238 239 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh); 240 *p++ = htonl(resp->mask); 241 if (!xdr_ressize_check(rqstp, p)) 242 return 0; 243 base = (char *)p - (char *)head->iov_base; 244 245 rqstp->rq_res.page_len = w = nfsacl_size( 246 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 247 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 248 while (w > 0) { 249 if (!rqstp->rq_respages[rqstp->rq_resused++]) 250 return 0; 251 w -= PAGE_SIZE; 252 } 253 254 n = nfsacl_encode(&rqstp->rq_res, base, inode, 255 resp->acl_access, 256 resp->mask & NFS_ACL, 0); 257 if (n > 0) 258 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 259 resp->acl_default, 260 resp->mask & NFS_DFACL, 261 NFS_ACL_DEFAULT); 262 if (n <= 0) 263 return 0; 264 return 1; 265 } 266 267 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p, 268 struct nfsd_attrstat *resp) 269 { 270 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh); 271 return xdr_ressize_check(rqstp, p); 272 } 273 274 /* ACCESS */ 275 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, 276 struct nfsd3_accessres *resp) 277 { 278 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh); 279 *p++ = htonl(resp->access); 280 return xdr_ressize_check(rqstp, p); 281 } 282 283 /* 284 * XDR release functions 285 */ 286 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p, 287 struct nfsd3_getaclres *resp) 288 { 289 fh_put(&resp->fh); 290 posix_acl_release(resp->acl_access); 291 posix_acl_release(resp->acl_default); 292 return 1; 293 } 294 295 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p, 296 struct nfsd_attrstat *resp) 297 { 298 fh_put(&resp->fh); 299 return 1; 300 } 301 302 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p, 303 struct nfsd3_accessres *resp) 304 { 305 fh_put(&resp->fh); 306 return 1; 307 } 308 309 #define nfsaclsvc_decode_voidargs NULL 310 #define nfsaclsvc_encode_voidres NULL 311 #define nfsaclsvc_release_void NULL 312 #define nfsd3_fhandleargs nfsd_fhandle 313 #define nfsd3_attrstatres nfsd_attrstat 314 #define nfsd3_voidres nfsd3_voidargs 315 struct nfsd3_voidargs { int dummy; }; 316 317 #define PROC(name, argt, rest, relt, cache, respsize) \ 318 { (svc_procfunc) nfsacld_proc_##name, \ 319 (kxdrproc_t) nfsaclsvc_decode_##argt##args, \ 320 (kxdrproc_t) nfsaclsvc_encode_##rest##res, \ 321 (kxdrproc_t) nfsaclsvc_release_##relt, \ 322 sizeof(struct nfsd3_##argt##args), \ 323 sizeof(struct nfsd3_##rest##res), \ 324 0, \ 325 cache, \ 326 respsize, \ 327 } 328 329 #define ST 1 /* status*/ 330 #define AT 21 /* attributes */ 331 #define pAT (1+AT) /* post attributes - conditional */ 332 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 333 334 static struct svc_procedure nfsd_acl_procedures2[] = { 335 PROC(null, void, void, void, RC_NOCACHE, ST), 336 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), 337 PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT), 338 PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT), 339 PROC(access, access, access, access, RC_NOCACHE, ST+AT+1), 340 }; 341 342 struct svc_version nfsd_acl_version2 = { 343 .vs_vers = 2, 344 .vs_nproc = 5, 345 .vs_proc = nfsd_acl_procedures2, 346 .vs_dispatch = nfsd_dispatch, 347 .vs_xdrsize = NFS3_SVC_XDRSIZE, 348 .vs_hidden = 1, 349 }; 350