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 */ 21 static __be32 22 nfsacld_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 */ 30 static __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_inval; 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_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_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. */ 81 out: 82 return rpc_success; 83 84 fail: 85 posix_acl_release(resp->acl_access); 86 posix_acl_release(resp->acl_default); 87 goto out; 88 } 89 90 /* 91 * Set the Access and/or Default ACL of a file. 92 */ 93 static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp) 94 { 95 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 96 struct nfsd_attrstat *resp = rqstp->rq_resp; 97 struct inode *inode; 98 svc_fh *fh; 99 int error; 100 101 dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); 102 103 fh = fh_copy(&resp->fh, &argp->fh); 104 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); 105 if (resp->status != nfs_ok) 106 goto out; 107 108 inode = d_inode(fh->fh_dentry); 109 110 error = fh_want_write(fh); 111 if (error) 112 goto out_errno; 113 114 fh_lock(fh); 115 116 error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access); 117 if (error) 118 goto out_drop_lock; 119 error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default); 120 if (error) 121 goto out_drop_lock; 122 123 fh_unlock(fh); 124 125 fh_drop_write(fh); 126 127 resp->status = fh_getattr(fh, &resp->stat); 128 129 out: 130 /* argp->acl_{access,default} may have been allocated in 131 nfssvc_decode_setaclargs. */ 132 posix_acl_release(argp->acl_access); 133 posix_acl_release(argp->acl_default); 134 return rpc_success; 135 136 out_drop_lock: 137 fh_unlock(fh); 138 fh_drop_write(fh); 139 out_errno: 140 resp->status = nfserrno(error); 141 goto out; 142 } 143 144 /* 145 * Check file attributes 146 */ 147 static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp) 148 { 149 struct nfsd_fhandle *argp = rqstp->rq_argp; 150 struct nfsd_attrstat *resp = rqstp->rq_resp; 151 152 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); 153 154 fh_copy(&resp->fh, &argp->fh); 155 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 156 if (resp->status != nfs_ok) 157 goto out; 158 resp->status = fh_getattr(&resp->fh, &resp->stat); 159 out: 160 return rpc_success; 161 } 162 163 /* 164 * Check file access 165 */ 166 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp) 167 { 168 struct nfsd3_accessargs *argp = rqstp->rq_argp; 169 struct nfsd3_accessres *resp = rqstp->rq_resp; 170 171 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n", 172 SVCFH_fmt(&argp->fh), 173 argp->access); 174 175 fh_copy(&resp->fh, &argp->fh); 176 resp->access = argp->access; 177 resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL); 178 if (resp->status != nfs_ok) 179 goto out; 180 resp->status = fh_getattr(&resp->fh, &resp->stat); 181 out: 182 return rpc_success; 183 } 184 185 /* 186 * XDR decode functions 187 */ 188 189 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p) 190 { 191 struct nfsd3_getaclargs *argp = rqstp->rq_argp; 192 193 p = nfs2svc_decode_fh(p, &argp->fh); 194 if (!p) 195 return 0; 196 argp->mask = ntohl(*p); p++; 197 198 return xdr_argsize_check(rqstp, p); 199 } 200 201 202 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p) 203 { 204 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 205 struct kvec *head = rqstp->rq_arg.head; 206 unsigned int base; 207 int n; 208 209 p = nfs2svc_decode_fh(p, &argp->fh); 210 if (!p) 211 return 0; 212 argp->mask = ntohl(*p++); 213 if (argp->mask & ~NFS_ACL_MASK || 214 !xdr_argsize_check(rqstp, p)) 215 return 0; 216 217 base = (char *)p - (char *)head->iov_base; 218 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 219 (argp->mask & NFS_ACL) ? 220 &argp->acl_access : NULL); 221 if (n > 0) 222 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 223 (argp->mask & NFS_DFACL) ? 224 &argp->acl_default : NULL); 225 return (n > 0); 226 } 227 228 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) 229 { 230 struct nfsd_fhandle *argp = rqstp->rq_argp; 231 232 p = nfs2svc_decode_fh(p, &argp->fh); 233 if (!p) 234 return 0; 235 return xdr_argsize_check(rqstp, p); 236 } 237 238 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p) 239 { 240 struct nfsd3_accessargs *argp = rqstp->rq_argp; 241 242 p = nfs2svc_decode_fh(p, &argp->fh); 243 if (!p) 244 return 0; 245 argp->access = ntohl(*p++); 246 247 return xdr_argsize_check(rqstp, p); 248 } 249 250 /* 251 * XDR encode functions 252 */ 253 254 /* GETACL */ 255 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p) 256 { 257 struct nfsd3_getaclres *resp = rqstp->rq_resp; 258 struct dentry *dentry = resp->fh.fh_dentry; 259 struct inode *inode; 260 struct kvec *head = rqstp->rq_res.head; 261 unsigned int base; 262 int n; 263 int w; 264 265 *p++ = resp->status; 266 if (resp->status != nfs_ok) 267 return xdr_ressize_check(rqstp, p); 268 269 /* 270 * Since this is version 2, the check for nfserr in 271 * nfsd_dispatch actually ensures the following cannot happen. 272 * However, it seems fragile to depend on that. 273 */ 274 if (dentry == NULL || d_really_is_negative(dentry)) 275 return 0; 276 inode = d_inode(dentry); 277 278 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 279 *p++ = htonl(resp->mask); 280 if (!xdr_ressize_check(rqstp, p)) 281 return 0; 282 base = (char *)p - (char *)head->iov_base; 283 284 rqstp->rq_res.page_len = w = nfsacl_size( 285 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 286 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 287 while (w > 0) { 288 if (!*(rqstp->rq_next_page++)) 289 return 0; 290 w -= PAGE_SIZE; 291 } 292 293 n = nfsacl_encode(&rqstp->rq_res, base, inode, 294 resp->acl_access, 295 resp->mask & NFS_ACL, 0); 296 if (n > 0) 297 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 298 resp->acl_default, 299 resp->mask & NFS_DFACL, 300 NFS_ACL_DEFAULT); 301 return (n > 0); 302 } 303 304 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p) 305 { 306 struct nfsd_attrstat *resp = rqstp->rq_resp; 307 308 *p++ = resp->status; 309 if (resp->status != nfs_ok) 310 goto out; 311 312 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 313 out: 314 return xdr_ressize_check(rqstp, p); 315 } 316 317 /* ACCESS */ 318 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p) 319 { 320 struct nfsd3_accessres *resp = rqstp->rq_resp; 321 322 *p++ = resp->status; 323 if (resp->status != nfs_ok) 324 goto out; 325 326 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 327 *p++ = htonl(resp->access); 328 out: 329 return xdr_ressize_check(rqstp, p); 330 } 331 332 /* 333 * XDR release functions 334 */ 335 static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp) 336 { 337 struct nfsd3_getaclres *resp = rqstp->rq_resp; 338 339 fh_put(&resp->fh); 340 posix_acl_release(resp->acl_access); 341 posix_acl_release(resp->acl_default); 342 } 343 344 static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp) 345 { 346 struct nfsd_attrstat *resp = rqstp->rq_resp; 347 348 fh_put(&resp->fh); 349 } 350 351 static void nfsaclsvc_release_access(struct svc_rqst *rqstp) 352 { 353 struct nfsd3_accessres *resp = rqstp->rq_resp; 354 355 fh_put(&resp->fh); 356 } 357 358 struct nfsd3_voidargs { int dummy; }; 359 360 #define ST 1 /* status*/ 361 #define AT 21 /* attributes */ 362 #define pAT (1+AT) /* post attributes - conditional */ 363 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 364 365 static const struct svc_procedure nfsd_acl_procedures2[5] = { 366 [ACLPROC2_NULL] = { 367 .pc_func = nfsacld_proc_null, 368 .pc_decode = nfssvc_decode_voidarg, 369 .pc_encode = nfssvc_encode_voidres, 370 .pc_argsize = sizeof(struct nfsd_voidargs), 371 .pc_ressize = sizeof(struct nfsd_voidres), 372 .pc_cachetype = RC_NOCACHE, 373 .pc_xdrressize = ST, 374 }, 375 [ACLPROC2_GETACL] = { 376 .pc_func = nfsacld_proc_getacl, 377 .pc_decode = nfsaclsvc_decode_getaclargs, 378 .pc_encode = nfsaclsvc_encode_getaclres, 379 .pc_release = nfsaclsvc_release_getacl, 380 .pc_argsize = sizeof(struct nfsd3_getaclargs), 381 .pc_ressize = sizeof(struct nfsd3_getaclres), 382 .pc_cachetype = RC_NOCACHE, 383 .pc_xdrressize = ST+1+2*(1+ACL), 384 }, 385 [ACLPROC2_SETACL] = { 386 .pc_func = nfsacld_proc_setacl, 387 .pc_decode = nfsaclsvc_decode_setaclargs, 388 .pc_encode = nfsaclsvc_encode_attrstatres, 389 .pc_release = nfsaclsvc_release_attrstat, 390 .pc_argsize = sizeof(struct nfsd3_setaclargs), 391 .pc_ressize = sizeof(struct nfsd_attrstat), 392 .pc_cachetype = RC_NOCACHE, 393 .pc_xdrressize = ST+AT, 394 }, 395 [ACLPROC2_GETATTR] = { 396 .pc_func = nfsacld_proc_getattr, 397 .pc_decode = nfsaclsvc_decode_fhandleargs, 398 .pc_encode = nfsaclsvc_encode_attrstatres, 399 .pc_release = nfsaclsvc_release_attrstat, 400 .pc_argsize = sizeof(struct nfsd_fhandle), 401 .pc_ressize = sizeof(struct nfsd_attrstat), 402 .pc_cachetype = RC_NOCACHE, 403 .pc_xdrressize = ST+AT, 404 }, 405 [ACLPROC2_ACCESS] = { 406 .pc_func = nfsacld_proc_access, 407 .pc_decode = nfsaclsvc_decode_accessargs, 408 .pc_encode = nfsaclsvc_encode_accessres, 409 .pc_release = nfsaclsvc_release_access, 410 .pc_argsize = sizeof(struct nfsd3_accessargs), 411 .pc_ressize = sizeof(struct nfsd3_accessres), 412 .pc_cachetype = RC_NOCACHE, 413 .pc_xdrressize = ST+AT+1, 414 }, 415 }; 416 417 static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)]; 418 const struct svc_version nfsd_acl_version2 = { 419 .vs_vers = 2, 420 .vs_nproc = 5, 421 .vs_proc = nfsd_acl_procedures2, 422 .vs_count = nfsd_acl_count2, 423 .vs_dispatch = nfsd_dispatch, 424 .vs_xdrsize = NFS3_SVC_XDRSIZE, 425 }; 426