GC !__DragonFly__ section.
[dragonfly.git] / sbin / mount_umap / mount_umap.c
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1/*
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved.
37 * @(#)mount_umap.c 8.5 (Berkeley) 4/26/95
38 * $FreeBSD: src/sbin/mount_umap/mount_umap.c,v 1.15 1999/10/09 11:54:13 phk Exp $
7cee7052 39 * $DragonFly: src/sbin/mount_umap/Attic/mount_umap.c,v 1.7 2004/12/18 21:43:39 swildner Exp $
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40 */
41
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42#include <sys/param.h>
43#include <sys/mount.h>
44#include <sys/stat.h>
45
38a690d7 46#include <vfs/umapfs/umap.h>
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47
48#include <err.h>
49#include <stdio.h>
8af0d623 50#include <stdlib.h>
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51#include <string.h>
52#include <sysexits.h>
53#include <unistd.h>
54
55#include "mntopts.h"
56
57#define ROOTUSER 0
58/*
59 * This define controls whether any user but the superuser can own and
60 * write mapfiles. If other users can, system security can be gravely
61 * compromised. If this is not a concern, undefine SECURITY.
62 */
63#define MAPSECURITY 1
64
65/*
66 * This routine provides the user interface to mounting a umap layer.
67 * It takes 4 mandatory parameters. The mandatory arguments are the place
68 * where the next lower level is mounted, the place where the umap layer is to
69 * be mounted, the name of the user mapfile, and the name of the group
70 * mapfile. The routine checks the ownerships and permissions on the
71 * mapfiles, then opens and reads them. Then it calls mount(), which
72 * will, in turn, call the umap version of mount.
73 */
74
75static struct mntopt mopts[] = {
76 MOPT_STDOPTS,
77 { NULL }
78};
79
9a76cd75 80static void usage(void) __dead2;
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81
82int
b5744197 83main(int argc, char **argv)
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84{
85 static char not[] = "; not mounted";
86 struct stat statbuf;
87 struct umap_args args;
88 FILE *fp, *gfp;
89 u_long gmapdata[GMAPFILEENTRIES][2], mapdata[MAPFILEENTRIES][2];
90 int ch, count, gnentries, mntflags, nentries;
91 char *gmapfile, *mapfile, buf[20];
92 char source[MAXPATHLEN], target[MAXPATHLEN];
93 struct vfsconf vfc;
94 int error;
95
96 mntflags = 0;
97 mapfile = gmapfile = NULL;
98 while ((ch = getopt(argc, argv, "g:o:u:")) != -1)
99 switch (ch) {
100 case 'g':
101 gmapfile = optarg;
102 break;
103 case 'o':
104 getmntopts(optarg, mopts, &mntflags, 0);
105 break;
106 case 'u':
107 mapfile = optarg;
108 break;
109 case '?':
110 default:
111 usage();
112 }
113 argc -= optind;
114 argv += optind;
115
116 if (argc != 2 || mapfile == NULL || gmapfile == NULL)
117 usage();
118
119 /* resolve both target and source with realpath(3) */
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120 checkpath(argv[0], source);
121 checkpath(argv[1], target);
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122
123 /* Read in uid mapping data. */
124 if ((fp = fopen(mapfile, "r")) == NULL)
125 err(EX_NOINPUT, "%s%s", mapfile, not);
126
127#ifdef MAPSECURITY
128 /*
129 * Check that group and other don't have write permissions on
130 * this mapfile, and that the mapfile belongs to root.
131 */
132 if (fstat(fileno(fp), &statbuf))
133 err(EX_OSERR, "%s%s", mapfile, not);
134 if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
135 strmode(statbuf.st_mode, buf);
136 err(EX_NOPERM, "%s: improper write permissions (%s)%s",
137 mapfile, buf, not);
138 }
139 if (statbuf.st_uid != ROOTUSER)
140 errx(EX_NOPERM, "%s does not belong to root%s", mapfile, not);
141#endif /* MAPSECURITY */
142
143 if ((fscanf(fp, "%d\n", &nentries)) != 1)
144 errx(EX_DATAERR, "%s: nentries not found%s", mapfile, not);
145 if (nentries > MAPFILEENTRIES)
146 errx(EX_DATAERR,
147 "maximum number of entries is %d%s", MAPFILEENTRIES, not);
148#if 0
7cee7052 149 printf("reading %d entries\n", nentries);
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150#endif
151 for (count = 0; count < nentries; ++count) {
152 if ((fscanf(fp, "%lu %lu\n",
153 &(mapdata[count][0]), &(mapdata[count][1]))) != 2) {
154 if (ferror(fp))
155 err(EX_OSERR, "%s%s", mapfile, not);
156 if (feof(fp))
157 errx(EX_DATAERR, "%s: unexpected end-of-file%s",
158 mapfile, not);
159 errx(EX_DATAERR, "%s: illegal format (line %d)%s",
160 mapfile, count + 2, not);
161 }
162#if 0
163 /* Fix a security hole. */
164 if (mapdata[count][1] == 0)
165 errx(1, "mapping id 0 not permitted (line %d)%s",
166 count + 2, not);
167#endif
168 }
169
170 /* Read in gid mapping data. */
171 if ((gfp = fopen(gmapfile, "r")) == NULL)
172 err(EX_NOINPUT, "%s%s", gmapfile, not);
173
174#ifdef MAPSECURITY
175 /*
176 * Check that group and other don't have write permissions on
177 * this group mapfile, and that the file belongs to root.
178 */
179 if (fstat(fileno(gfp), &statbuf))
180 err(EX_OSERR, "%s%s", gmapfile, not);
181 if (statbuf.st_mode & S_IWGRP || statbuf.st_mode & S_IWOTH) {
182 strmode(statbuf.st_mode, buf);
183 err(EX_NOPERM, "%s: improper write permissions (%s)%s",
184 gmapfile, buf, not);
185 }
186 if (statbuf.st_uid != ROOTUSER)
187 errx(EX_NOPERM, "%s does not belong to root%s", gmapfile, not);
188#endif /* MAPSECURITY */
189
190 if ((fscanf(gfp, "%d\n", &gnentries)) != 1)
191 errx(EX_DATAERR, "%s: nentries not found%s", gmapfile, not);
192 if (gnentries > MAPFILEENTRIES)
193 errx(EX_DATAERR,
194 "maximum number of entries is %d%s", GMAPFILEENTRIES, not);
195#if 0
7cee7052 196 printf("reading %d group entries\n", gnentries);
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197#endif
198
199 for (count = 0; count < gnentries; ++count)
200 if ((fscanf(gfp, "%lu %lu\n",
201 &(gmapdata[count][0]), &(gmapdata[count][1]))) != 2) {
202 if (ferror(gfp))
203 err(EX_OSERR, "%s%s", gmapfile, not);
204 if (feof(gfp))
205 errx(EX_DATAERR, "%s: unexpected end-of-file%s",
206 gmapfile, not);
207 errx(EX_DATAERR, "%s: illegal format (line %d)%s",
208 gmapfile, count + 2, not);
209 }
210
211
212 /* Setup mount call args. */
213 args.target = source;
214 args.nentries = nentries;
215 args.mapdata = mapdata;
216 args.gnentries = gnentries;
217 args.gmapdata = gmapdata;
218
219 error = getvfsbyname("umap", &vfc);
220 if (error && vfsisloadable("umap")) {
221 if(vfsload("umap"))
222 err(1, "vfsload(umap)");
223 endvfsent();
224 error = getvfsbyname("umap", &vfc);
225 }
226 if (error)
227 errx(1, "umap filesystem is not available");
228
229 if (mount(vfc.vfc_name, argv[1], mntflags, &args))
230 err(1, NULL);
231 exit(0);
232}
233
234void
b5744197 235usage(void)
984263bc 236{
7cee7052 237 fprintf(stderr,
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238"usage: mount_umap [-o options] -u usermap -g groupmap target_fs mount_point\n");
239 exit(EX_USAGE);
240}