229 lines
6.1 KiB
C
229 lines
6.1 KiB
C
/* $OpenBSD: mount_vnd.c,v 1.22 2019/06/28 13:32:45 deraadt Exp $ */
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/*
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* Copyright (c) 1993 University of Utah.
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* Copyright (c) 1990, 1993
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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 contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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/param.h> /* DEV_BSIZE */
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/disklabel.h>
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#include <dev/vndioctl.h>
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#include <blf.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <readpassphrase.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 <limits.h>
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#include <util.h>
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__dead void usage(void);
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int config(char *, char *, struct disklabel *, char *, size_t);
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char *get_pkcs_key(char *, char *);
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int
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main(int argc, char **argv)
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{
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int ch, rv, opt_k = 0, opt_K = 0;
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char *key = NULL, *mntopts = NULL, *rounds = NULL, *saltopt = NULL;
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size_t keylen = 0;
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struct disklabel *dp = NULL;
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while ((ch = getopt(argc, argv, "kK:o:S:t:")) != -1) {
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switch (ch) {
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case 'k':
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opt_k = 1;
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break;
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case 'K':
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opt_K = 1;
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rounds = optarg;
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break;
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case 'o':
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mntopts = optarg;
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break;
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case 'S':
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saltopt = optarg;
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break;
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case 't':
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dp = getdiskbyname(optarg);
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if (dp == NULL)
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errx(1, "unknown disk type: %s", optarg);
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (saltopt && !opt_K)
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errx(1, "-S only makes sense when used with -K");
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if (argc != 2)
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usage();
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if (opt_k || opt_K)
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fprintf(stderr, "WARNING: Consider using softraid crypto.\n");
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if (opt_k) {
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if (opt_K)
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errx(1, "-k and -K are mutually exclusive");
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key = getpass("Encryption key: ");
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if (key == NULL || (keylen = strlen(key)) == 0)
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errx(1, "Need an encryption key");
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} else if (opt_K) {
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key = get_pkcs_key(rounds, saltopt);
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keylen = BLF_MAXUTILIZED;
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}
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rv = config(argv[1], argv[0], dp, key, keylen);
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exit(rv);
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}
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char *
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get_pkcs_key(char *arg, char *saltopt)
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{
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char passphrase[128] = {'\0'};
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char saltbuf[128] = {'\0'}, saltfilebuf[PATH_MAX];
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char *key = NULL;
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char *saltfile;
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const char *errstr;
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int rounds;
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rounds = strtonum(arg, 1000, INT_MAX, &errstr);
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if (errstr)
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err(1, "rounds: %s", errstr);
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if (readpassphrase("Encryption key: ", passphrase, sizeof(passphrase),
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RPP_REQUIRE_TTY) == NULL)
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errx(1, "Unable to read passphrase");
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if (saltopt)
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saltfile = saltopt;
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else {
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printf("Salt file: ");
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fflush(stdout);
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saltfile = fgets(saltfilebuf, sizeof(saltfilebuf), stdin);
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if (saltfile)
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saltfile[strcspn(saltfile, "\n")] = '\0';
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}
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if (!saltfile || saltfile[0] == '\0')
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warnx("Skipping salt file, insecure");
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else {
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int fd;
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fd = open(saltfile, O_RDONLY);
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if (fd == -1) {
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int *s;
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fprintf(stderr, "Salt file not found, attempting to "
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"create one\n");
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fd = open(saltfile, O_RDWR|O_CREAT|O_EXCL, 0600);
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if (fd == -1)
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err(1, "Unable to create salt file: '%s'",
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saltfile);
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for (s = (int *)saltbuf;
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s < (int *)(saltbuf + sizeof(saltbuf)); s++)
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*s = arc4random();
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if (write(fd, saltbuf, sizeof(saltbuf))
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!= sizeof(saltbuf))
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err(1, "Unable to write salt file: '%s'",
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saltfile);
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fprintf(stderr, "Salt file created as '%s'\n",
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saltfile);
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} else {
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if (read(fd, saltbuf, sizeof(saltbuf))
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!= sizeof(saltbuf))
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err(1, "Unable to read salt file: '%s'",
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saltfile);
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}
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close(fd);
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}
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if ((key = calloc(1, BLF_MAXUTILIZED)) == NULL)
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err(1, NULL);
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if (pkcs5_pbkdf2(passphrase, sizeof(passphrase), saltbuf,
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sizeof (saltbuf), key, BLF_MAXUTILIZED, rounds))
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errx(1, "pkcs5_pbkdf2 failed");
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explicit_bzero(passphrase, sizeof(passphrase));
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return (key);
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}
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int
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config(char *dev, char *file, struct disklabel *dp, char *key, size_t keylen)
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{
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struct vnd_ioctl vndio;
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char *rdev;
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int fd, rv = -1;
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if ((fd = opendev(dev, O_RDONLY, OPENDEV_PART, &rdev)) == -1) {
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err(4, "%s", rdev);
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goto out;
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}
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vndio.vnd_file = file;
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vndio.vnd_secsize = (dp && dp->d_secsize) ? dp->d_secsize : DEV_BSIZE;
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vndio.vnd_nsectors = (dp && dp->d_nsectors) ? dp->d_nsectors : 100;
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vndio.vnd_ntracks = (dp && dp->d_ntracks) ? dp->d_ntracks : 1;
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vndio.vnd_key = (u_char *)key;
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vndio.vnd_keylen = keylen;
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/*
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* Configure the device
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*/
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rv = ioctl(fd, VNDIOCSET, &vndio);
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if (rv)
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warn("VNDIOCSET");
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close(fd);
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fflush(stdout);
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out:
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if (key)
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explicit_bzero(key, keylen);
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return (rv < 0);
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}
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__dead void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: mount_vnd [-k] [-K rounds] [-o options] "
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"[-S saltfile] [-t disktype]\n"
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"\t\t image vnd_dev\n");
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exit(1);
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}
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