266 lines
7.7 KiB
C
266 lines
7.7 KiB
C
/* $NetBSD: mount_umap.c,v 1.23 2011/08/29 14:35:03 joerg Exp $ */
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/*
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mount_umap.c 8.5 (Berkeley) 4/26/95";
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#else
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__RCSID("$NetBSD: mount_umap.c,v 1.23 2011/08/29 14:35:03 joerg Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <miscfs/umapfs/umap.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <mntopts.h>
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#define ROOTUSER 0
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/*
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* This define controls whether any user but the superuser can own and
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* write mapfiles. If other users can, system security can be gravely
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* compromised. If this is not a concern, undefine SECURITY.
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*/
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#define MAPSECURITY 1
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/*
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* This routine provides the user interface to mounting a umap layer.
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* It takes 4 mandatory parameters. The mandatory arguments are the place
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* where the next lower level is mounted, the place where the umap layer is to
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* be mounted, the name of the user mapfile, and the name of the group
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* mapfile. The routine checks the ownerships and permissions on the
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* mapfiles, then opens and reads them. Then it calls mount(), which
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* will, in turn, call the umap version of mount.
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*/
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static const struct mntopt mopts[] = {
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MOPT_STDOPTS,
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MOPT_NULL,
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};
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int mount_umap(int argc, char **argv);
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__dead static void usage(void);
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#ifndef MOUNT_NOMAIN
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int
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main(int argc, char **argv)
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{
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return mount_umap(argc, argv);
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}
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#endif
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int
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mount_umap(int argc, char *argv[])
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{
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static char not[] = "; not mounted.";
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struct stat statbuf;
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struct umap_args args;
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FILE *fp, *gfp;
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long d1, d2;
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u_long mapdata[MAPFILEENTRIES][2];
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u_long gmapdata[GMAPFILEENTRIES][2];
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int ch, count, gnentries, mntflags, nentries;
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char *gmapfile, *mapfile, buf[20];
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char source[MAXPATHLEN], target[MAXPATHLEN];
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mntoptparse_t mp;
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mntflags = 0;
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mapfile = gmapfile = NULL;
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while ((ch = getopt(argc, argv, "g:o:u:")) != -1)
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switch (ch) {
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case 'g':
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gmapfile = optarg;
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break;
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case 'o':
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mp = getmntopts(optarg, mopts, &mntflags, 0);
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if (mp == NULL)
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err(1, "getmntopts");
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freemntopts(mp);
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break;
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case 'u':
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mapfile = optarg;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 2 || mapfile == NULL || gmapfile == NULL)
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usage();
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if (realpath(argv[0], source) == NULL) /* Check source path */
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err(1, "realpath %s", argv[0]);
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if (strncmp(argv[0], source, MAXPATHLEN)) {
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warnx("\"%s\" is a relative path.", argv[0]);
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warnx("using \"%s\" instead.", source);
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}
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if (realpath(argv[1], target) == NULL) /* Check mounton path */
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err(1, "realpath %s", argv[1]);
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if (strncmp(argv[1], target, MAXPATHLEN)) {
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warnx("\"%s\" is a relative path.", argv[1]);
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warnx("using \"%s\" instead.", target);
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}
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/* Read in uid mapping data. */
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if ((fp = fopen(mapfile, "r")) == NULL)
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err(1, "%s%s", mapfile, not);
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#ifdef MAPSECURITY
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/*
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* Check that group and other don't have write permissions on
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* this mapfile, and that the mapfile belongs to root.
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*/
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if (fstat(fileno(fp), &statbuf))
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err(1, "%s%s", mapfile, not);
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if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
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strmode(statbuf.st_mode, buf);
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err(1, "%s: improper write permissions (%s)%s",
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mapfile, buf, not);
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}
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if (statbuf.st_uid != ROOTUSER)
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errx(1, "%s does not belong to root%s", mapfile, not);
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#endif /* MAPSECURITY */
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if ((fscanf(fp, "%d\n", &nentries)) != 1)
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errx(1, "%s: nentries not found%s", mapfile, not);
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if (nentries > MAPFILEENTRIES)
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errx(1,
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"maximum number of entries is %d%s", MAPFILEENTRIES, not);
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#if 0
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(void)printf("reading %d entries\n", nentries);
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#endif
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for (count = 0; count < nentries; ++count) {
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if ((fscanf(fp, "%lu %lu\n", &d1, &d2)) != 2) {
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if (ferror(fp))
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err(1, "%s%s", mapfile, not);
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if (feof(fp))
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errx(1, "%s: unexpected end-of-file%s",
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mapfile, not);
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errx(1, "%s: illegal format (line %d)%s",
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mapfile, count + 2, not);
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}
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mapdata[count][0] = d1;
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mapdata[count][1] = d2;
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#if 0
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/* Fix a security hole. */
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if (mapdata[count][1] == 0)
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errx(1, "mapping id 0 not permitted (line %d)%s",
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count + 2, not);
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#endif
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}
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/* Read in gid mapping data. */
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if ((gfp = fopen(gmapfile, "r")) == NULL)
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err(1, "%s%s", gmapfile, not);
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#ifdef MAPSECURITY
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/*
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* Check that group and other don't have write permissions on
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* this group mapfile, and that the file belongs to root.
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*/
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if (fstat(fileno(gfp), &statbuf))
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err(1, "%s%s", gmapfile, not);
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if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
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strmode(statbuf.st_mode, buf);
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err(1, "%s: improper write permissions (%s)%s",
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gmapfile, buf, not);
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}
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if (statbuf.st_uid != ROOTUSER)
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errx(1, "%s does not belong to root%s", gmapfile, not);
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#endif /* MAPSECURITY */
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if ((fscanf(gfp, "%d\n", &gnentries)) != 1)
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errx(1, "nentries not found%s", not);
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if (gnentries > MAPFILEENTRIES)
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errx(1,
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"maximum number of entries is %d%s", GMAPFILEENTRIES, not);
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#if 0
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(void)printf("reading %d group entries\n", gnentries);
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#endif
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for (count = 0; count < gnentries; ++count) {
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if ((fscanf(gfp, "%lu %lu\n",
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&(gmapdata[count][0]), &(gmapdata[count][1]))) != 2) {
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if (ferror(gfp))
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err(1, "%s%s", gmapfile, not);
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if (feof(gfp))
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errx(1, "%s: unexpected end-of-file%s",
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gmapfile, not);
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errx(1, "%s: illegal format (line %d)%s",
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gmapfile, count + 2, not);
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}
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}
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/* Setup mount call args. */
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args.la.target = source;
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args.nentries = nentries;
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args.mapdata = mapdata;
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args.gnentries = gnentries;
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args.gmapdata = gmapdata;
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if (mount(MOUNT_UMAP, target, mntflags, &args, sizeof args) == -1)
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err(1, "%s on %s", source, target);
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if (mntflags & MNT_GETARGS) {
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printf("nentries=%d, gnentries=%d\n", args.nentries,
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args.gnentries);
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}
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: mount_umap [-o options] -g groupmap -u usermap target_fs mount_point\n");
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exit(1);
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}
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