1 /* $OpenBSD: vnconfig.c,v 1.13 2023/05/14 18:34:02 krw Exp $ */
2 /*
3 * Copyright (c) 1993 University of Utah.
4 * Copyright (c) 1990, 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 * the Systems Programming Group of the University of Utah Computer
9 * Science Department.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 e */
35
36 #include <sys/param.h> /* DEV_BSIZE */
37 #include <sys/ioctl.h>
38 #include <sys/stat.h>
39 #include <sys/disklabel.h>
40
41 #include <dev/vndioctl.h>
42
43 #include <blf.h>
44 #include <err.h>
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <readpassphrase.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <limits.h>
53 #include <util.h>
54
55 #define DEFAULT_VND "vnd0"
56
57 #define VND_CONFIG 1
58 #define VND_UNCONFIG 2
59 #define VND_GETINFO 3
60
61 int verbose = 0;
62
63 __dead void usage(void);
64 int config(char *, char *, struct disklabel *, char *, size_t);
65 int unconfig(char *);
66 int getinfo(const char *, int *availp);
67 char *get_pkcs_key(char *, char *);
68
69 int
main(int argc,char ** argv)70 main(int argc, char **argv)
71 {
72 int ch, rv, action, opt_k = 0, opt_K = 0, opt_l = 0, opt_u = 0;
73 char *key = NULL, *rounds = NULL, *saltopt = NULL;
74 char *file, *vnd;
75 size_t keylen = 0;
76 extern char *__progname;
77 struct disklabel *dp = NULL;
78
79 action = VND_CONFIG;
80
81 while ((ch = getopt(argc, argv, "kK:lo:S:t:uv")) != -1) {
82 switch (ch) {
83 case 'k':
84 opt_k = 1;
85 break;
86 case 'K':
87 opt_K = 1;
88 rounds = optarg;
89 break;
90 case 'l':
91 opt_l = 1;
92 break;
93 case 'S':
94 saltopt = optarg;
95 break;
96 case 't':
97 dp = getdiskbyname(optarg);
98 if (dp == NULL)
99 errx(1, "unknown disk type: %s", optarg);
100 break;
101 case 'u':
102 opt_u = 1;
103 break;
104 case 'v':
105 verbose = 1;
106 break;
107 default:
108 usage();
109 /* NOTREACHED */
110 }
111 }
112 argc -= optind;
113 argv += optind;
114
115 if (opt_l + opt_u > 1)
116 errx(1, "-l and -u are mutually exclusive options");
117
118 if (opt_l)
119 action = VND_GETINFO;
120 else if (opt_u)
121 action = VND_UNCONFIG;
122
123 if (saltopt && (!opt_K))
124 errx(1, "-S only makes sense when used with -K");
125
126 if (action == VND_CONFIG) {
127 if (argc == 1) {
128 file = argv[0];
129 vnd = NULL;
130 } else if (argc == 2) {
131 vnd = argv[0];
132 file = argv[1];
133 } else
134 usage();
135
136 if (opt_k || opt_K)
137 fprintf(stderr, "WARNING: Consider using softraid crypto.\n");
138 if (opt_k) {
139 if (opt_K)
140 errx(1, "-k and -K are mutually exclusive");
141 key = getpass("Encryption key: ");
142 if (key == NULL || (keylen = strlen(key)) == 0)
143 errx(1, "Need an encryption key");
144 } else if (opt_K) {
145 key = get_pkcs_key(rounds, saltopt);
146 keylen = BLF_MAXUTILIZED;
147 }
148 rv = config(file, vnd, dp, key, keylen);
149 } else if (action == VND_UNCONFIG && argc == 1)
150 rv = unconfig(argv[0]);
151 else if (action == VND_GETINFO)
152 rv = getinfo(argc ? argv[0] : NULL, NULL);
153 else
154 usage();
155
156 exit(rv);
157 }
158
159 char *
get_pkcs_key(char * arg,char * saltopt)160 get_pkcs_key(char *arg, char *saltopt)
161 {
162 char passphrase[128] = {'\0'};
163 char saltbuf[128] = {'\0'}, saltfilebuf[PATH_MAX];
164 char *key = NULL;
165 char *saltfile;
166 const char *errstr;
167 int rounds;
168
169 rounds = strtonum(arg, 1000, INT_MAX, &errstr);
170 if (errstr)
171 err(1, "rounds: %s", errstr);
172 if (readpassphrase("Encryption key: ", passphrase, sizeof(passphrase),
173 RPP_REQUIRE_TTY) == NULL)
174 errx(1, "Unable to read passphrase");
175 if (saltopt)
176 saltfile = saltopt;
177 else {
178 printf("Salt file: ");
179 fflush(stdout);
180 saltfile = fgets(saltfilebuf, sizeof(saltfilebuf), stdin);
181 if (saltfile)
182 saltfile[strcspn(saltfile, "\n")] = '\0';
183 }
184 if (!saltfile || saltfile[0] == '\0')
185 warnx("Skipping salt file, insecure");
186 else {
187 int fd;
188
189 fd = open(saltfile, O_RDONLY);
190 if (fd == -1) {
191 int *s;
192
193 fprintf(stderr, "Salt file not found, attempting to "
194 "create one\n");
195 fd = open(saltfile, O_RDWR|O_CREAT|O_EXCL, 0600);
196 if (fd == -1)
197 err(1, "Unable to create salt file: '%s'",
198 saltfile);
199 for (s = (int *)saltbuf;
200 s < (int *)(saltbuf + sizeof(saltbuf)); s++)
201 *s = arc4random();
202 if (write(fd, saltbuf, sizeof(saltbuf))
203 != sizeof(saltbuf))
204 err(1, "Unable to write salt file: '%s'",
205 saltfile);
206 fprintf(stderr, "Salt file created as '%s'\n",
207 saltfile);
208 } else {
209 if (read(fd, saltbuf, sizeof(saltbuf))
210 != sizeof(saltbuf))
211 err(1, "Unable to read salt file: '%s'",
212 saltfile);
213 }
214 close(fd);
215 }
216 if ((key = calloc(1, BLF_MAXUTILIZED)) == NULL)
217 err(1, NULL);
218 if (pkcs5_pbkdf2(passphrase, sizeof(passphrase), saltbuf,
219 sizeof (saltbuf), key, BLF_MAXUTILIZED, rounds))
220 errx(1, "pkcs5_pbkdf2 failed");
221 explicit_bzero(passphrase, sizeof(passphrase));
222
223 return (key);
224 }
225
226 int
getinfo(const char * vname,int * availp)227 getinfo(const char *vname, int *availp)
228 {
229 int vd, print_all = 0;
230 struct vnd_user vnu;
231
232 if (vname == NULL) {
233 vname = DEFAULT_VND;
234 print_all = 1;
235 }
236
237 vd = opendev(vname, O_RDONLY, OPENDEV_PART, NULL);
238 if (vd == -1)
239 err(1, "open: %s", vname);
240
241 vnu.vnu_unit = -1;
242
243 query:
244 if (ioctl(vd, VNDIOCGET, &vnu) == -1) {
245 if (print_all && errno == ENXIO && vnu.vnu_unit > 0)
246 goto end;
247 err(1, "ioctl: %s", vname);
248 }
249
250 if (availp) {
251 if (!vnu.vnu_ino) {
252 *availp = vnu.vnu_unit;
253 close(vd);
254 return (0);
255 }
256 vnu.vnu_unit++;
257 goto query;
258 }
259
260 fprintf(stdout, "vnd%d: ", vnu.vnu_unit);
261
262 if (!vnu.vnu_ino)
263 fprintf(stdout, "not in use\n");
264 else
265 fprintf(stdout, "covering %s on %s, inode %llu\n",
266 vnu.vnu_file, devname(vnu.vnu_dev, S_IFBLK),
267 (unsigned long long)vnu.vnu_ino);
268
269 if (print_all) {
270 vnu.vnu_unit++;
271 goto query;
272 }
273
274 end:
275 close(vd);
276 if (availp)
277 return (-1);
278 return (0);
279 }
280
281 int
config(char * file,char * dev,struct disklabel * dp,char * key,size_t keylen)282 config(char *file, char *dev, struct disklabel *dp, char *key, size_t keylen)
283 {
284 struct vnd_ioctl vndio;
285 char *rdev;
286 int fd, rv = -1;
287 int unit, print_dev = 0;
288
289 if (dev == NULL) {
290 if (getinfo(NULL, &unit) == -1)
291 err(1, "no devices available");
292 print_dev = 1;
293 asprintf(&dev, "vnd%d", unit);
294 }
295
296 if ((fd = opendev(dev, O_RDONLY, OPENDEV_PART, &rdev)) == -1) {
297 err(4, "%s", rdev);
298 goto out;
299 }
300
301 memset(&vndio, 0, sizeof vndio);
302 vndio.vnd_file = file;
303 vndio.vnd_type = (dp && dp->d_type) ? dp->d_type : DTYPE_VND;
304 vndio.vnd_secsize = (dp && dp->d_secsize) ? dp->d_secsize : DEV_BSIZE;
305 vndio.vnd_nsectors = (dp && dp->d_nsectors) ? dp->d_nsectors : 100;
306 vndio.vnd_ntracks = (dp && dp->d_ntracks) ? dp->d_ntracks : 1;
307 vndio.vnd_key = (u_char *)key;
308 vndio.vnd_keylen = keylen;
309
310 /*
311 * Configure the device
312 */
313 rv = ioctl(fd, VNDIOCSET, &vndio);
314 if (rv)
315 warn("VNDIOCSET");
316 else {
317 if (print_dev)
318 printf("%s\n", dev);
319 if (verbose)
320 fprintf(stderr, "%s: %llu bytes on %s\n", dev,
321 vndio.vnd_size, file);
322 }
323
324 close(fd);
325 fflush(stdout);
326 out:
327 if (key)
328 explicit_bzero(key, keylen);
329 explicit_bzero(&vndio.vnd_keylen, sizeof vndio.vnd_keylen);
330 return (rv == -1);
331 }
332
333 int
unconfig(char * vnd)334 unconfig(char *vnd)
335 {
336 struct vnd_ioctl vndio;
337 int fd, rv = -1;
338 char *rdev;
339
340 if ((fd = opendev(vnd, O_RDONLY, OPENDEV_PART, &rdev)) == -1)
341 err(4, "%s", rdev);
342
343 memset(&vndio, 0, sizeof vndio);
344 vndio.vnd_file = vnd;
345
346 /*
347 * Clear (un-configure) the device
348 */
349 rv = ioctl(fd, VNDIOCCLR, &vndio);
350 if (rv)
351 warn("VNDIOCCLR");
352 else if (verbose)
353 fprintf(stderr, "%s: cleared\n", vnd);
354
355 close(fd);
356 fflush(stdout);
357 return (rv == -1);
358 }
359
360 __dead void
usage(void)361 usage(void)
362 {
363 fprintf(stderr,
364 "usage: vnconfig [-v] [-k | -K rounds [-S saltfile]] "
365 "[-t disktype] [vnd_dev] image\n"
366 " vnconfig -l [vnd_dev]\n"
367 " vnconfig -u [-v] vnd_dev\n");
368 exit(1);
369 }
370