233 lines
6.9 KiB
C
233 lines
6.9 KiB
C
|
/*
|
||
|
|
* 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
|
||
|
|
static char sccsid[] = "@(#)mount_umap.c 8.3 (Berkeley) 3/27/94";
|
||
|
|
#endif /* not lint */
|
||
|
|
|
||
|
|
#include <sys/param.h>
|
||
|
|
#include <sys/mount.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
|
||
|
|
#include <miscfs/umapfs/umap.h>
|
||
|
|
|
||
|
|
#include <err.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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
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;
|
||
|
|
u_long gmapdata[GMAPFILEENTRIES][2], mapdata[MAPFILEENTRIES][2];
|
||
|
|
int ch, count, gnentries, mntflags, nentries;
|
||
|
|
char *gmapfile, *mapfile, *source, *target, buf[20];
|
||
|
|
|
||
|
|
mntflags = 0;
|
||
|
|
mapfile = gmapfile = NULL;
|
||
|
|
while ((ch = getopt(argc, argv, "g:o:u:")) != EOF)
|
||
|
|
switch (ch) {
|
||
|
|
case 'g':
|
||
|
|
gmapfile = optarg;
|
||
|
|
break;
|
||
|
|
case 'o':
|
||
|
|
getmntopts(optarg, mopts, &mntflags);
|
||
|
|
break;
|
||
|
|
case 'u':
|
||
|
|
mapfile = optarg;
|
||
|
|
break;
|
||
|
|
case '?':
|
||
|
|
default:
|
||
|
|
usage();
|
||
|
|
}
|
||
|
|
argc -= optind;
|
||
|
|
argv += optind;
|
||
|
|
|
||
|
|
if (argc != 2 || mapfile == NULL || gmapfile == NULL)
|
||
|
|
usage();
|
||
|
|
|
||
|
|
source = argv[0];
|
||
|
|
target = argv[1];
|
||
|
|
|
||
|
|
/* Read in uid mapping data. */
|
||
|
|
if ((fp = fopen(mapfile, "r")) == NULL)
|
||
|
|
err(1, "%s%s", mapfile, not);
|
||
|
|
|
||
|
|
#ifdef MAPSECURITY
|
||
|
|
/*
|
||
|
|
* Check that group and other don't have write permissions on
|
||
|
|
* this mapfile, and that the mapfile belongs to root.
|
||
|
|
*/
|
||
|
|
if (fstat(fileno(fp), &statbuf))
|
||
|
|
err(1, "%s%s", mapfile, 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",
|
||
|
|
mapfile, buf, not);
|
||
|
|
}
|
||
|
|
if (statbuf.st_uid != ROOTUSER)
|
||
|
|
errx(1, "%s does not belong to root%s", mapfile, not);
|
||
|
|
#endif /* MAPSECURITY */
|
||
|
|
|
||
|
|
if ((fscanf(fp, "%d\n", &nentries)) != 1)
|
||
|
|
errx(1, "%s: nentries not found%s", mapfile, not);
|
||
|
|
if (nentries > MAPFILEENTRIES)
|
||
|
|
errx(1,
|
||
|
|
"maximum number of entries is %d%s", MAPFILEENTRIES, not);
|
||
|
|
#if 0
|
||
|
|
(void)printf("reading %d entries\n", nentries);
|
||
|
|
#endif
|
||
|
|
for (count = 0; count < nentries; ++count) {
|
||
|
|
if ((fscanf(fp, "%lu %lu\n",
|
||
|
|
&(mapdata[count][0]), &(mapdata[count][1]))) != 2) {
|
||
|
|
if (ferror(fp))
|
||
|
|
err(1, "%s%s", mapfile, not);
|
||
|
|
if (feof(fp))
|
||
|
|
errx(1, "%s: unexpected end-of-file%s",
|
||
|
|
mapfile, not);
|
||
|
|
errx(1, "%s: illegal format (line %d)%s",
|
||
|
|
mapfile, count + 2, not);
|
||
|
|
}
|
||
|
|
#if 0
|
||
|
|
/* Fix a security hole. */
|
||
|
|
if (mapdata[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(fp, "%d\n", &gnentries)) != 1)
|
||
|
|
errx(1, "nentries not found%s", gmapfile, not);
|
||
|
|
if (gnentries > MAPFILEENTRIES)
|
||
|
|
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(fp, "%lu %lu\n",
|
||
|
|
&(gmapdata[count][0]), &(gmapdata[count][1]))) != 2) {
|
||
|
|
if (ferror(fp))
|
||
|
|
err(1, "%s%s", gmapfile, not);
|
||
|
|
if (feof(fp))
|
||
|
|
errx(1, "%s: unexpected end-of-file%s",
|
||
|
|
gmapfile, not);
|
||
|
|
errx(1, "%s: illegal format (line %d)%s",
|
||
|
|
gmapfile, count + 2, not);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Setup mount call args. */
|
||
|
|
args.target = source;
|
||
|
|
args.nentries = nentries;
|
||
|
|
args.mapdata = mapdata;
|
||
|
|
args.gnentries = gnentries;
|
||
|
|
args.gmapdata = gmapdata;
|
||
|
|
|
||
|
|
if (mount(MOUNT_UMAP, argv[1], mntflags, &args))
|
||
|
|
err(1, NULL);
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
usage()
|
||
|
|
{
|
||
|
|
(void)fprintf(stderr,
|
||
|
|
"usage: mount_umap [-o options] -u usermap -g groupmap target_fs mount_point\n");
|
||
|
|
exit(1);
|
||
|
|
}
|