nfs_srvsubs.c revision 1.5
1 /* $NetBSD: nfs_srvsubs.c,v 1.5 2009/09/27 17:23:54 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95 35 */ 36 37 /* 38 * Copyright 2000 Wasabi Systems, Inc. 39 * All rights reserved. 40 * 41 * Written by Frank van der Linden for Wasabi Systems, Inc. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed for the NetBSD Project by 54 * Wasabi Systems, Inc. 55 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 56 * or promote products derived from this software without specific prior 57 * written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 61 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 62 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 63 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 64 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 65 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 66 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 67 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 68 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 69 * POSSIBILITY OF SUCH DAMAGE. 70 */ 71 72 #include <sys/cdefs.h> 73 __KERNEL_RCSID(0, "$NetBSD: nfs_srvsubs.c,v 1.5 2009/09/27 17:23:54 dholland Exp $"); 74 75 #include <sys/param.h> 76 #include <sys/proc.h> 77 #include <sys/systm.h> 78 #include <sys/kernel.h> 79 #include <sys/kmem.h> 80 #include <sys/mount.h> 81 #include <sys/vnode.h> 82 #include <sys/namei.h> 83 #include <sys/mbuf.h> 84 #include <sys/socket.h> 85 #include <sys/stat.h> 86 #include <sys/filedesc.h> 87 #include <sys/time.h> 88 #include <sys/dirent.h> 89 #include <sys/once.h> 90 #include <sys/kauth.h> 91 #include <sys/atomic.h> 92 93 #include <uvm/uvm_extern.h> 94 95 #include <nfs/rpcv2.h> 96 #include <nfs/nfsproto.h> 97 #include <nfs/nfsnode.h> 98 #include <nfs/nfs.h> 99 #include <nfs/xdr_subs.h> 100 #include <nfs/nfsm_subs.h> 101 #include <nfs/nfsmount.h> 102 #include <nfs/nfsrtt.h> 103 #include <nfs/nfs_var.h> 104 105 #include <miscfs/specfs/specdev.h> 106 107 #include <netinet/in.h> 108 109 /* 110 * Set up nameidata for a lookup() call and do it. 111 * 112 * If pubflag is set, this call is done for a lookup operation on the 113 * public filehandle. In that case we allow crossing mountpoints and 114 * absolute pathnames. However, the caller is expected to check that 115 * the lookup result is within the public fs, and deny access if 116 * it is not. 117 */ 118 int 119 nfs_namei(struct nameidata *ndp, nfsrvfh_t *nsfh, uint32_t len, struct nfssvc_sock *slp, struct mbuf *nam, struct mbuf **mdp, char **dposp, struct vnode **retdirp, struct lwp *l, int kerbflag, int pubflag) 120 { 121 int i, rem; 122 struct mbuf *md; 123 char *fromcp, *tocp, *cp; 124 struct vnode *dp; 125 int error, rdonly; 126 int neverfollow; 127 struct componentname *cnp = &ndp->ni_cnd; 128 129 *retdirp = NULL; 130 131 if ((len + 1) > MAXPATHLEN) 132 return (ENAMETOOLONG); 133 if (len == 0) 134 return (EACCES); 135 cnp->cn_pnbuf = PNBUF_GET(); 136 137 /* 138 * Copy the name from the mbuf list to ndp->ni_pnbuf 139 * and set the various ndp fields appropriately. 140 */ 141 fromcp = *dposp; 142 tocp = cnp->cn_pnbuf; 143 md = *mdp; 144 rem = mtod(md, char *) + md->m_len - fromcp; 145 for (i = 0; i < len; i++) { 146 while (rem == 0) { 147 md = md->m_next; 148 if (md == NULL) { 149 error = EBADRPC; 150 goto out; 151 } 152 fromcp = mtod(md, void *); 153 rem = md->m_len; 154 } 155 if (*fromcp == '\0' || (!pubflag && *fromcp == '/')) { 156 error = EACCES; 157 goto out; 158 } 159 *tocp++ = *fromcp++; 160 rem--; 161 } 162 *tocp = '\0'; 163 *mdp = md; 164 *dposp = fromcp; 165 len = nfsm_rndup(len)-len; 166 if (len > 0) { 167 if (rem >= len) 168 *dposp += len; 169 else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0) 170 goto out; 171 } 172 173 /* 174 * Extract and set starting directory. 175 */ 176 error = nfsrv_fhtovp(nsfh, false, &dp, ndp->ni_cnd.cn_cred, slp, 177 nam, &rdonly, kerbflag, pubflag); 178 if (error) 179 goto out; 180 if (dp->v_type != VDIR) { 181 vrele(dp); 182 error = ENOTDIR; 183 goto out; 184 } 185 186 if (rdonly) 187 cnp->cn_flags |= RDONLY; 188 189 *retdirp = dp; 190 191 if (pubflag) { 192 /* 193 * Oh joy. For WebNFS, handle those pesky '%' escapes, 194 * and the 'native path' indicator. 195 */ 196 cp = PNBUF_GET(); 197 fromcp = cnp->cn_pnbuf; 198 tocp = cp; 199 if ((unsigned char)*fromcp >= WEBNFS_SPECCHAR_START) { 200 switch ((unsigned char)*fromcp) { 201 case WEBNFS_NATIVE_CHAR: 202 /* 203 * 'Native' path for us is the same 204 * as a path according to the NFS spec, 205 * just skip the escape char. 206 */ 207 fromcp++; 208 break; 209 /* 210 * More may be added in the future, range 0x80-0xff 211 */ 212 default: 213 error = EIO; 214 vrele(dp); 215 PNBUF_PUT(cp); 216 goto out; 217 } 218 } 219 /* 220 * Translate the '%' escapes, URL-style. 221 */ 222 while (*fromcp != '\0') { 223 if (*fromcp == WEBNFS_ESC_CHAR) { 224 if (fromcp[1] != '\0' && fromcp[2] != '\0') { 225 fromcp++; 226 *tocp++ = HEXSTRTOI(fromcp); 227 fromcp += 2; 228 continue; 229 } else { 230 error = ENOENT; 231 vrele(dp); 232 PNBUF_PUT(cp); 233 goto out; 234 } 235 } else 236 *tocp++ = *fromcp++; 237 } 238 *tocp = '\0'; 239 PNBUF_PUT(cnp->cn_pnbuf); 240 cnp->cn_pnbuf = cp; 241 } 242 243 ndp->ni_pathlen = (tocp - cnp->cn_pnbuf) + 1; 244 ndp->ni_segflg = UIO_SYSSPACE; 245 ndp->ni_rootdir = rootvnode; 246 ndp->ni_erootdir = NULL; 247 248 if (pubflag) { 249 ndp->ni_loopcnt = 0; 250 if (cnp->cn_pnbuf[0] == '/') 251 dp = rootvnode; 252 } else { 253 cnp->cn_flags |= NOCROSSMOUNT; 254 } 255 256 neverfollow = !pubflag; 257 258 /* 259 * And call lookup() to do the real work 260 */ 261 error = lookup_for_nfsd(ndp, dp, neverfollow); 262 if (error) { 263 return (error); 264 } 265 return 0; 266 267 out: 268 PNBUF_PUT(cnp->cn_pnbuf); 269 return (error); 270 } 271 272 /* 273 * nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked) 274 * - look up fsid in mount list (if not found ret error) 275 * - get vp and export rights by calling VFS_FHTOVP() 276 * - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon 277 * - if not lockflag unlock it with VOP_UNLOCK() 278 */ 279 int 280 nfsrv_fhtovp(nfsrvfh_t *nsfh, int lockflag, struct vnode **vpp, 281 kauth_cred_t cred, struct nfssvc_sock *slp, struct mbuf *nam, int *rdonlyp, 282 int kerbflag, int pubflag) 283 { 284 struct mount *mp; 285 kauth_cred_t credanon; 286 int error, exflags; 287 struct sockaddr_in *saddr; 288 fhandle_t *fhp; 289 290 fhp = NFSRVFH_FHANDLE(nsfh); 291 *vpp = (struct vnode *)0; 292 293 if (nfs_ispublicfh(nsfh)) { 294 if (!pubflag || !nfs_pub.np_valid) 295 return (ESTALE); 296 fhp = nfs_pub.np_handle; 297 } 298 299 error = netexport_check(&fhp->fh_fsid, nam, &mp, &exflags, &credanon); 300 if (error) { 301 return error; 302 } 303 304 error = VFS_FHTOVP(mp, &fhp->fh_fid, vpp); 305 if (error) 306 return (error); 307 308 if (!(exflags & (MNT_EXNORESPORT|MNT_EXPUBLIC))) { 309 saddr = mtod(nam, struct sockaddr_in *); 310 if ((saddr->sin_family == AF_INET) && 311 ntohs(saddr->sin_port) >= IPPORT_RESERVED) { 312 vput(*vpp); 313 return (NFSERR_AUTHERR | AUTH_TOOWEAK); 314 } 315 if ((saddr->sin_family == AF_INET6) && 316 ntohs(saddr->sin_port) >= IPV6PORT_RESERVED) { 317 vput(*vpp); 318 return (NFSERR_AUTHERR | AUTH_TOOWEAK); 319 } 320 } 321 /* 322 * Check/setup credentials. 323 */ 324 if (exflags & MNT_EXKERB) { 325 if (!kerbflag) { 326 vput(*vpp); 327 return (NFSERR_AUTHERR | AUTH_TOOWEAK); 328 } 329 } else if (kerbflag) { 330 vput(*vpp); 331 return (NFSERR_AUTHERR | AUTH_TOOWEAK); 332 } else if (kauth_cred_geteuid(cred) == 0 || /* NFS maproot, see below */ 333 (exflags & MNT_EXPORTANON)) { 334 /* 335 * This is used by the NFS maproot option. While we can change 336 * the secmodel on our own host, we can't change it on the 337 * clients. As means of least surprise, we're doing the 338 * traditional thing here. 339 * Should look into adding a "mapprivileged" or similar where 340 * the users can be explicitly specified... 341 * [elad, yamt 2008-03-05] 342 */ 343 kauth_cred_clone(credanon, cred); 344 } 345 if (exflags & MNT_EXRDONLY) 346 *rdonlyp = 1; 347 else 348 *rdonlyp = 0; 349 if (!lockflag) 350 VOP_UNLOCK(*vpp, 0); 351 return (0); 352 } 353 354 /* 355 * WebNFS: check if a filehandle is a public filehandle. For v3, this 356 * means a length of 0, for v2 it means all zeroes. 357 */ 358 int 359 nfs_ispublicfh(const nfsrvfh_t *nsfh) 360 { 361 const char *cp = (const void *)(NFSRVFH_DATA(nsfh)); 362 int i; 363 364 if (NFSRVFH_SIZE(nsfh) == 0) { 365 return true; 366 } 367 if (NFSRVFH_SIZE(nsfh) != NFSX_V2FH) { 368 return false; 369 } 370 for (i = 0; i < NFSX_V2FH; i++) 371 if (*cp++ != 0) 372 return false; 373 return true; 374 } 375 376 int 377 nfsrv_composefh(struct vnode *vp, nfsrvfh_t *nsfh, bool v3) 378 { 379 int error; 380 size_t fhsize; 381 382 fhsize = NFSD_MAXFHSIZE; 383 error = vfs_composefh(vp, (void *)NFSRVFH_DATA(nsfh), &fhsize); 384 if (NFSX_FHTOOBIG_P(fhsize, v3)) { 385 error = EOPNOTSUPP; 386 } 387 if (error != 0) { 388 return error; 389 } 390 if (!v3 && fhsize < NFSX_V2FH) { 391 memset((char *)NFSRVFH_DATA(nsfh) + fhsize, 0, 392 NFSX_V2FH - fhsize); 393 fhsize = NFSX_V2FH; 394 } 395 if ((fhsize % NFSX_UNSIGNED) != 0) { 396 return EOPNOTSUPP; 397 } 398 nsfh->nsfh_size = fhsize; 399 return 0; 400 } 401 402 int 403 nfsrv_comparefh(const nfsrvfh_t *fh1, const nfsrvfh_t *fh2) 404 { 405 406 if (NFSRVFH_SIZE(fh1) != NFSRVFH_SIZE(fh2)) { 407 return NFSRVFH_SIZE(fh2) - NFSRVFH_SIZE(fh1); 408 } 409 return memcmp(NFSRVFH_DATA(fh1), NFSRVFH_DATA(fh2), NFSRVFH_SIZE(fh1)); 410 } 411 412 void 413 nfsrv_copyfh(nfsrvfh_t *fh1, const nfsrvfh_t *fh2) 414 { 415 size_t size; 416 417 fh1->nsfh_size = size = NFSRVFH_SIZE(fh2); 418 memcpy(NFSRVFH_DATA(fh1), NFSRVFH_DATA(fh2), size); 419 } 420
Indexes created Tue Sep 23 07:09:52 GMT 2025