| File: | src/sbin/mount_vnd/mount_vnd.c |
| Warning: | line 78, column 4 Value stored to 'mntopts' is never read |
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| 1 | /* $OpenBSD: mount_vnd.c,v 1.22 2019/06/28 13:32:45 deraadt 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 | */ |
| 35 | |
| 36 | #include <sys/param.h> /* DEV_BSIZE */ |
| 37 | #include <sys/ioctl.h> |
| 38 | #include <sys/mount.h> |
| 39 | #include <sys/stat.h> |
| 40 | #include <sys/disklabel.h> |
| 41 | |
| 42 | #include <dev/vndioctl.h> |
| 43 | |
| 44 | #include <blf.h> |
| 45 | #include <err.h> |
| 46 | #include <errno(*__errno()).h> |
| 47 | #include <fcntl.h> |
| 48 | #include <readpassphrase.h> |
| 49 | #include <stdio.h> |
| 50 | #include <stdlib.h> |
| 51 | #include <string.h> |
| 52 | #include <unistd.h> |
| 53 | #include <limits.h> |
| 54 | #include <util.h> |
| 55 | |
| 56 | __dead__attribute__((__noreturn__)) void usage(void); |
| 57 | int config(char *, char *, struct disklabel *, char *, size_t); |
| 58 | char *get_pkcs_key(char *, char *); |
| 59 | |
| 60 | int |
| 61 | main(int argc, char **argv) |
| 62 | { |
| 63 | int ch, rv, opt_k = 0, opt_K = 0; |
| 64 | char *key = NULL((void *)0), *mntopts = NULL((void *)0), *rounds = NULL((void *)0), *saltopt = NULL((void *)0); |
| 65 | size_t keylen = 0; |
| 66 | struct disklabel *dp = NULL((void *)0); |
| 67 | |
| 68 | while ((ch = getopt(argc, argv, "kK:o:S:t:")) != -1) { |
| 69 | switch (ch) { |
| 70 | case 'k': |
| 71 | opt_k = 1; |
| 72 | break; |
| 73 | case 'K': |
| 74 | opt_K = 1; |
| 75 | rounds = optarg; |
| 76 | break; |
| 77 | case 'o': |
| 78 | mntopts = optarg; |
Value stored to 'mntopts' is never read | |
| 79 | break; |
| 80 | case 'S': |
| 81 | saltopt = optarg; |
| 82 | break; |
| 83 | case 't': |
| 84 | dp = getdiskbyname(optarg); |
| 85 | if (dp == NULL((void *)0)) |
| 86 | errx(1, "unknown disk type: %s", optarg); |
| 87 | break; |
| 88 | default: |
| 89 | usage(); |
| 90 | /* NOTREACHED */ |
| 91 | } |
| 92 | } |
| 93 | argc -= optind; |
| 94 | argv += optind; |
| 95 | |
| 96 | if (saltopt && !opt_K) |
| 97 | errx(1, "-S only makes sense when used with -K"); |
| 98 | |
| 99 | if (argc != 2) |
| 100 | usage(); |
| 101 | |
| 102 | if (opt_k || opt_K) |
| 103 | fprintf(stderr(&__sF[2]), "WARNING: Consider using softraid crypto.\n"); |
| 104 | if (opt_k) { |
| 105 | if (opt_K) |
| 106 | errx(1, "-k and -K are mutually exclusive"); |
| 107 | key = getpass("Encryption key: "); |
| 108 | if (key == NULL((void *)0) || (keylen = strlen(key)) == 0) |
| 109 | errx(1, "Need an encryption key"); |
| 110 | } else if (opt_K) { |
| 111 | key = get_pkcs_key(rounds, saltopt); |
| 112 | keylen = BLF_MAXUTILIZED((16 +2)*4); |
| 113 | } |
| 114 | rv = config(argv[1], argv[0], dp, key, keylen); |
| 115 | |
| 116 | exit(rv); |
| 117 | } |
| 118 | |
| 119 | char * |
| 120 | get_pkcs_key(char *arg, char *saltopt) |
| 121 | { |
| 122 | char passphrase[128] = {'\0'}; |
| 123 | char saltbuf[128] = {'\0'}, saltfilebuf[PATH_MAX1024]; |
| 124 | char *key = NULL((void *)0); |
| 125 | char *saltfile; |
| 126 | const char *errstr; |
| 127 | int rounds; |
| 128 | |
| 129 | rounds = strtonum(arg, 1000, INT_MAX2147483647, &errstr); |
| 130 | if (errstr) |
| 131 | err(1, "rounds: %s", errstr); |
| 132 | if (readpassphrase("Encryption key: ", passphrase, sizeof(passphrase), |
| 133 | RPP_REQUIRE_TTY0x02) == NULL((void *)0)) |
| 134 | errx(1, "Unable to read passphrase"); |
| 135 | if (saltopt) |
| 136 | saltfile = saltopt; |
| 137 | else { |
| 138 | printf("Salt file: "); |
| 139 | fflush(stdout(&__sF[1])); |
| 140 | saltfile = fgets(saltfilebuf, sizeof(saltfilebuf), stdin(&__sF[0])); |
| 141 | if (saltfile) |
| 142 | saltfile[strcspn(saltfile, "\n")] = '\0'; |
| 143 | } |
| 144 | if (!saltfile || saltfile[0] == '\0') |
| 145 | warnx("Skipping salt file, insecure"); |
| 146 | else { |
| 147 | int fd; |
| 148 | |
| 149 | fd = open(saltfile, O_RDONLY0x0000); |
| 150 | if (fd == -1) { |
| 151 | int *s; |
| 152 | |
| 153 | fprintf(stderr(&__sF[2]), "Salt file not found, attempting to " |
| 154 | "create one\n"); |
| 155 | fd = open(saltfile, O_RDWR0x0002|O_CREAT0x0200|O_EXCL0x0800, 0600); |
| 156 | if (fd == -1) |
| 157 | err(1, "Unable to create salt file: '%s'", |
| 158 | saltfile); |
| 159 | for (s = (int *)saltbuf; |
| 160 | s < (int *)(saltbuf + sizeof(saltbuf)); s++) |
| 161 | *s = arc4random(); |
| 162 | if (write(fd, saltbuf, sizeof(saltbuf)) |
| 163 | != sizeof(saltbuf)) |
| 164 | err(1, "Unable to write salt file: '%s'", |
| 165 | saltfile); |
| 166 | fprintf(stderr(&__sF[2]), "Salt file created as '%s'\n", |
| 167 | saltfile); |
| 168 | } else { |
| 169 | if (read(fd, saltbuf, sizeof(saltbuf)) |
| 170 | != sizeof(saltbuf)) |
| 171 | err(1, "Unable to read salt file: '%s'", |
| 172 | saltfile); |
| 173 | } |
| 174 | close(fd); |
| 175 | } |
| 176 | if ((key = calloc(1, BLF_MAXUTILIZED((16 +2)*4))) == NULL((void *)0)) |
| 177 | err(1, NULL((void *)0)); |
| 178 | if (pkcs5_pbkdf2(passphrase, sizeof(passphrase), saltbuf, |
| 179 | sizeof (saltbuf), key, BLF_MAXUTILIZED((16 +2)*4), rounds)) |
| 180 | errx(1, "pkcs5_pbkdf2 failed"); |
| 181 | explicit_bzero(passphrase, sizeof(passphrase)); |
| 182 | |
| 183 | return (key); |
| 184 | } |
| 185 | |
| 186 | int |
| 187 | config(char *dev, char *file, struct disklabel *dp, char *key, size_t keylen) |
| 188 | { |
| 189 | struct vnd_ioctl vndio; |
| 190 | char *rdev; |
| 191 | int fd, rv = -1; |
| 192 | |
| 193 | if ((fd = opendev(dev, O_RDONLY0x0000, OPENDEV_PART0x01, &rdev)) == -1) { |
| 194 | err(4, "%s", rdev); |
| 195 | goto out; |
| 196 | } |
| 197 | |
| 198 | vndio.vnd_file = file; |
| 199 | vndio.vnd_secsize = (dp && dp->d_secsize) ? dp->d_secsize : DEV_BSIZE(1 << 9); |
| 200 | vndio.vnd_nsectors = (dp && dp->d_nsectors) ? dp->d_nsectors : 100; |
| 201 | vndio.vnd_ntracks = (dp && dp->d_ntracks) ? dp->d_ntracks : 1; |
| 202 | vndio.vnd_key = (u_char *)key; |
| 203 | vndio.vnd_keylen = keylen; |
| 204 | |
| 205 | /* |
| 206 | * Configure the device |
| 207 | */ |
| 208 | rv = ioctl(fd, VNDIOCSET(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct vnd_ioctl) & 0x1fff) << 16) | ((('F')) << 8) | ((0))), &vndio); |
| 209 | if (rv) |
| 210 | warn("VNDIOCSET"); |
| 211 | |
| 212 | close(fd); |
| 213 | fflush(stdout(&__sF[1])); |
| 214 | out: |
| 215 | if (key) |
| 216 | explicit_bzero(key, keylen); |
| 217 | return (rv < 0); |
| 218 | } |
| 219 | |
| 220 | __dead__attribute__((__noreturn__)) void |
| 221 | usage(void) |
| 222 | { |
| 223 | (void)fprintf(stderr(&__sF[2]), |
| 224 | "usage: mount_vnd [-k] [-K rounds] [-o options] " |
| 225 | "[-S saltfile] [-t disktype]\n" |
| 226 | "\t\t image vnd_dev\n"); |
| 227 | exit(1); |
| 228 | } |