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 */ 21static __be32 22nfsacld_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 */ 30static __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. */ 81out: 82 return rpc_success; 83 84fail: 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 */ 93static __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 129out: 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 136out_drop_lock: 137 fh_unlock(fh); 138 fh_drop_write(fh); 139out_errno: 140 resp->status = nfserrno(error); 141 goto out; 142} 143 144/* 145 * Check file attributes 146 */ 147static __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); 159out: 160 return rpc_success; 161} 162 163/* 164 * Check file access 165 */ 166static __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); 181out: 182 return rpc_success; 183} 184 185/* 186 * XDR decode functions 187 */ 188static int nfsaclsvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p) 189{ 190 return 1; 191} 192 193static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p) 194{ 195 struct nfsd3_getaclargs *argp = rqstp->rq_argp; 196 197 p = nfs2svc_decode_fh(p, &argp->fh); 198 if (!p) 199 return 0; 200 argp->mask = ntohl(*p); p++; 201 202 return xdr_argsize_check(rqstp, p); 203} 204 205 206static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p) 207{ 208 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 209 struct kvec *head = rqstp->rq_arg.head; 210 unsigned int base; 211 int n; 212 213 p = nfs2svc_decode_fh(p, &argp->fh); 214 if (!p) 215 return 0; 216 argp->mask = ntohl(*p++); 217 if (argp->mask & ~NFS_ACL_MASK || 218 !xdr_argsize_check(rqstp, p)) 219 return 0; 220 221 base = (char *)p - (char *)head->iov_base; 222 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 223 (argp->mask & NFS_ACL) ? 224 &argp->acl_access : NULL); 225 if (n > 0) 226 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 227 (argp->mask & NFS_DFACL) ? 228 &argp->acl_default : NULL); 229 return (n > 0); 230} 231 232static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) 233{ 234 struct nfsd_fhandle *argp = rqstp->rq_argp; 235 236 p = nfs2svc_decode_fh(p, &argp->fh); 237 if (!p) 238 return 0; 239 return xdr_argsize_check(rqstp, p); 240} 241 242static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p) 243{ 244 struct nfsd3_accessargs *argp = rqstp->rq_argp; 245 246 p = nfs2svc_decode_fh(p, &argp->fh); 247 if (!p) 248 return 0; 249 argp->access = ntohl(*p++); 250 251 return xdr_argsize_check(rqstp, p); 252} 253 254/* 255 * XDR encode functions 256 */ 257 258/* 259 * There must be an encoding function for void results so svc_process 260 * will work properly. 261 */ 262static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) 263{ 264 return xdr_ressize_check(rqstp, p); 265} 266 267/* GETACL */ 268static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p) 269{ 270 struct nfsd3_getaclres *resp = rqstp->rq_resp; 271 struct dentry *dentry = resp->fh.fh_dentry; 272 struct inode *inode; 273 struct kvec *head = rqstp->rq_res.head; 274 unsigned int base; 275 int n; 276 int w; 277 278 *p++ = resp->status; 279 if (resp->status != nfs_ok) 280 return xdr_ressize_check(rqstp, p); 281 282 /* 283 * Since this is version 2, the check for nfserr in 284 * nfsd_dispatch actually ensures the following cannot happen. 285 * However, it seems fragile to depend on that. 286 */ 287 if (dentry == NULL || d_really_is_negative(dentry)) 288 return 0; 289 inode = d_inode(dentry); 290 291 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 292 *p++ = htonl(resp->mask); 293 if (!xdr_ressize_check(rqstp, p)) 294 return 0; 295 base = (char *)p - (char *)head->iov_base; 296 297 rqstp->rq_res.page_len = w = nfsacl_size( 298 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 299 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 300 while (w > 0) { 301 if (!*(rqstp->rq_next_page++)) 302 return 0; 303 w -= PAGE_SIZE; 304 } 305 306 n = nfsacl_encode(&rqstp->rq_res, base, inode, 307 resp->acl_access, 308 resp->mask & NFS_ACL, 0); 309 if (n > 0) 310 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 311 resp->acl_default, 312 resp->mask & NFS_DFACL, 313 NFS_ACL_DEFAULT); 314 return (n > 0); 315} 316 317static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p) 318{ 319 struct nfsd_attrstat *resp = rqstp->rq_resp; 320 321 *p++ = resp->status; 322 if (resp->status != nfs_ok) 323 goto out; 324 325 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 326out: 327 return xdr_ressize_check(rqstp, p); 328} 329 330/* ACCESS */ 331static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p) 332{ 333 struct nfsd3_accessres *resp = rqstp->rq_resp; 334 335 *p++ = resp->status; 336 if (resp->status != nfs_ok) 337 goto out; 338 339 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 340 *p++ = htonl(resp->access); 341out: 342 return xdr_ressize_check(rqstp, p); 343} 344 345/* 346 * XDR release functions 347 */ 348static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp) 349{ 350 struct nfsd3_getaclres *resp = rqstp->rq_resp; 351 352 fh_put(&resp->fh); 353 posix_acl_release(resp->acl_access); 354 posix_acl_release(resp->acl_default); 355} 356 357static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp) 358{ 359 struct nfsd_attrstat *resp = rqstp->rq_resp; 360 361 fh_put(&resp->fh); 362} 363 364static void nfsaclsvc_release_access(struct svc_rqst *rqstp) 365{ 366 struct nfsd3_accessres *resp = rqstp->rq_resp; 367 368 fh_put(&resp->fh); 369} 370 371struct nfsd3_voidargs { int dummy; }; 372 373#define ST 1 /* status*/ 374#define AT 21 /* attributes */ 375#define pAT (1+AT) /* post attributes - conditional */ 376#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 377 378static const struct svc_procedure nfsd_acl_procedures2[5] = { 379 [ACLPROC2_NULL] = { 380 .pc_func = nfsacld_proc_null, 381 .pc_decode = nfsaclsvc_decode_voidarg, 382 .pc_encode = nfsaclsvc_encode_voidres, 383 .pc_argsize = sizeof(struct nfsd3_voidargs), 384 .pc_ressize = sizeof(struct nfsd3_voidargs), 385 .pc_cachetype = RC_NOCACHE, 386 .pc_xdrressize = ST, 387 }, 388 [ACLPROC2_GETACL] = { 389 .pc_func = nfsacld_proc_getacl, 390 .pc_decode = nfsaclsvc_decode_getaclargs, 391 .pc_encode = nfsaclsvc_encode_getaclres, 392 .pc_release = nfsaclsvc_release_getacl, 393 .pc_argsize = sizeof(struct nfsd3_getaclargs), 394 .pc_ressize = sizeof(struct nfsd3_getaclres), 395 .pc_cachetype = RC_NOCACHE, 396 .pc_xdrressize = ST+1+2*(1+ACL), 397 }, 398 [ACLPROC2_SETACL] = { 399 .pc_func = nfsacld_proc_setacl, 400 .pc_decode = nfsaclsvc_decode_setaclargs, 401 .pc_encode = nfsaclsvc_encode_attrstatres, 402 .pc_release = nfsaclsvc_release_attrstat, 403 .pc_argsize = sizeof(struct nfsd3_setaclargs), 404 .pc_ressize = sizeof(struct nfsd_attrstat), 405 .pc_cachetype = RC_NOCACHE, 406 .pc_xdrressize = ST+AT, 407 }, 408 [ACLPROC2_GETATTR] = { 409 .pc_func = nfsacld_proc_getattr, 410 .pc_decode = nfsaclsvc_decode_fhandleargs, 411 .pc_encode = nfsaclsvc_encode_attrstatres, 412 .pc_release = nfsaclsvc_release_attrstat, 413 .pc_argsize = sizeof(struct nfsd_fhandle), 414 .pc_ressize = sizeof(struct nfsd_attrstat), 415 .pc_cachetype = RC_NOCACHE, 416 .pc_xdrressize = ST+AT, 417 }, 418 [ACLPROC2_ACCESS] = { 419 .pc_func = nfsacld_proc_access, 420 .pc_decode = nfsaclsvc_decode_accessargs, 421 .pc_encode = nfsaclsvc_encode_accessres, 422 .pc_release = nfsaclsvc_release_access, 423 .pc_argsize = sizeof(struct nfsd3_accessargs), 424 .pc_ressize = sizeof(struct nfsd3_accessres), 425 .pc_cachetype = RC_NOCACHE, 426 .pc_xdrressize = ST+AT+1, 427 }, 428}; 429 430static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)]; 431const struct svc_version nfsd_acl_version2 = { 432 .vs_vers = 2, 433 .vs_nproc = 5, 434 .vs_proc = nfsd_acl_procedures2, 435 .vs_count = nfsd_acl_count2, 436 .vs_dispatch = nfsd_dispatch, 437 .vs_xdrsize = NFS3_SVC_XDRSIZE, 438}; 439