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/* $OpenBSD: mount_umap.c,v 1.6 1997/08/20 05:10:27 millert Exp $ */
/* $NetBSD: mount_umap.c,v 1.5 1996/04/13 01:32:05 jtc Exp $ */
/*
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1992, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)mount_umap.c 8.3 (Berkeley) 3/27/94";
#else
static char rcsid[] = "$OpenBSD: mount_umap.c,v 1.6 1997/08/20 05:10:27 millert Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <miscfs/umapfs/umap.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mntopts.h"
#define ROOTUSER 0
/*
* This define controls whether any user but the superuser can own and
* write mapfiles. If other users can, system security can be gravely
* compromised. If this is not a concern, undefine SECURITY.
*/
#define MAPSECURITY 1
/*
* This routine provides the user interface to mounting a umap layer.
* It takes 4 mandatory parameters. The mandatory arguments are the place
* where the next lower level is mounted, the place where the umap layer is to
* be mounted, the name of the user mapfile, and the name of the group
* mapfile. The routine checks the ownerships and permissions on the
* mapfiles, then opens and reads them. Then it calls mount(), which
* will, in turn, call the umap version of mount.
*/
const struct mntopt mopts[] = {
MOPT_STDOPTS,
{ NULL }
};
void usage __P((void));
int
main(argc, argv)
int argc;
char *argv[];
{
static char not[] = "; not mounted.";
struct stat statbuf;
struct umap_args args;
FILE *fp, *gfp;
long d1, d2;
id_t umapdata[UMAPFILEENTRIES][2];
id_t gmapdata[GMAPFILEENTRIES][2];
int ch, count, gnentries, mntflags, unentries;
char *gmapfile, *umapfile, *source, *target, buf[20];
mntflags = 0;
umapfile = gmapfile = NULL;
while ((ch = getopt(argc, argv, "g:o:u:")) != -1)
switch (ch) {
case 'g':
gmapfile = optarg;
break;
case 'o':
getmntopts(optarg, mopts, &mntflags);
break;
case 'u':
umapfile = optarg;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 2 || umapfile == NULL || gmapfile == NULL)
usage();
source = argv[0];
target = argv[1];
/* Read in uid mapping data. */
if ((fp = fopen(umapfile, "r")) == NULL)
err(1, "%s%s", umapfile, not);
#ifdef MAPSECURITY
/*
* Check that group and other don't have write permissions on
* this umapfile, and that the umapfile belongs to root.
*/
if (fstat(fileno(fp), &statbuf))
err(1, "%s%s", umapfile, not);
if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
strmode(statbuf.st_mode, buf);
err(1, "%s: improper write permissions (%s)%s",
umapfile, buf, not);
}
if (statbuf.st_uid != ROOTUSER)
errx(1, "%s does not belong to root%s", umapfile, not);
#endif /* MAPSECURITY */
if ((fscanf(fp, "%d\n", &unentries)) != 1)
errx(1, "%s: nentries not found%s", umapfile, not);
if (unentries > UMAPFILEENTRIES)
errx(1,
"maximum number of entries is %d%s", UMAPFILEENTRIES, not);
#if 0
(void)printf("reading %d entries\n", unentries);
#endif
for (count = 0; count < unentries; ++count) {
if ((fscanf(fp, "%lu %lu\n", &d1, &d2)) != 2) {
if (ferror(fp))
err(1, "%s%s", umapfile, not);
if (feof(fp))
errx(1, "%s: unexpected end-of-file%s",
umapfile, not);
errx(1, "%s: illegal format (line %d)%s",
umapfile, count + 2, not);
}
umapdata[count][0] = d1;
umapdata[count][1] = d2;
#if 0
/* Fix a security hole. */
if (umapdata[count][1] == 0)
errx(1, "mapping id 0 not permitted (line %d)%s",
count + 2, not);
#endif
}
/* Read in gid mapping data. */
if ((gfp = fopen(gmapfile, "r")) == NULL)
err(1, "%s%s", gmapfile, not);
#ifdef MAPSECURITY
/*
* Check that group and other don't have write permissions on
* this group mapfile, and that the file belongs to root.
*/
if (fstat(fileno(gfp), &statbuf))
err(1, "%s%s", gmapfile, not);
if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
strmode(statbuf.st_mode, buf);
err(1, "%s: improper write permissions (%s)%s",
gmapfile, buf, not);
}
if (statbuf.st_uid != ROOTUSER)
errx(1, "%s does not belong to root%s", gmapfile, not);
#endif /* MAPSECURITY */
if ((fscanf(gfp, "%d\n", &gnentries)) != 1)
errx(1, "nentries not found%s", gmapfile, not);
if (gnentries > GMAPFILEENTRIES)
errx(1,
"maximum number of entries is %d%s", GMAPFILEENTRIES, not);
#if 0
(void)printf("reading %d group entries\n", gnentries);
#endif
for (count = 0; count < gnentries; ++count) {
if ((fscanf(gfp, "%lu %lu\n", &d1, &d2)) != 2) {
if (ferror(gfp))
err(1, "%s%s", gmapfile, not);
if (feof(gfp))
errx(1, "%s: unexpected end-of-file%s",
gmapfile, not);
errx(1, "%s: illegal format (line %d)%s",
gmapfile, count + 2, not);
}
gmapdata[count][0] = d1;
gmapdata[count][1] = d2;
}
/* Setup mount call args. */
args.target = source;
args.unentries = unentries;
args.umapdata = umapdata;
args.gnentries = gnentries;
args.gmapdata = gmapdata;
if (mount(MOUNT_UMAP, argv[1], mntflags, &args)) {
if (errno == EOPNOTSUPP)
errx(1, "%s: Filesystem not supported by kernel",
argv[1]);
else
err(1, argv[1]);
}
exit(0);
}
void
usage()
{
(void)fprintf(stderr,
"usage: mount_umap [-o options] -u usermap -g groupmap target_fs mount_point\n");
exit(1);
}
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