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freebsd-dev/sbin/gbde/gbde.c
Poul-Henning Kamp 1e90b74683 Solve another bug in the mapping code: correctly skip lock sectors. 
Make sure sector zero is protected if it contains metadata.

Lower WARNS for gbde to 3 on non-i386 archs.  rijndael-fst is evil
but appearntly does the right thing and passes the test-vectors.

MFC Candidate.
2002-12-18 22:11:54 +00:00

813 lines
19 KiB
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/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/mutex.h>
#include <md5.h>
#include <readpassphrase.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <paths.h>
#include <strings.h>
#include <stdlib.h>
#include <err.h>
#include <stdio.h>
#include <libutil.h>
#include <sys/errno.h>
#include <sys/disk.h>
#include <sys/stat.h>
#include <crypto/rijndael/rijndael.h>
#include <crypto/sha2/sha2.h>
#define KASSERT(foo, bar) do { if(!(foo)) { warn bar ; exit (1); } } while (0)
#include <geom/geom.h>
#include <geom/bde/g_bde.h>
extern const char template[];
#if 0
static void
g_hexdump(void *ptr, int length)
{
int i, j, k;
unsigned char *cp;
cp = ptr;
for (i = 0; i < length; i+= 16) {
printf("%04x ", i);
for (j = 0; j < 16; j++) {
k = i + j;
if (k < length)
printf(" %02x", cp[k]);
else
printf(" ");
}
printf(" |");
for (j = 0; j < 16; j++) {
k = i + j;
if (k >= length)
printf(" ");
else if (cp[k] >= ' ' && cp[k] <= '~')
printf("%c", cp[k]);
else
printf(".");
}
printf("|\n");
}
}
#endif
static void __dead2
usage(const char *reason)
{
const char *p;
p = getprogname();
fprintf(stderr, "Usage error: %s", reason);
fprintf(stderr, "Usage:\n");
fprintf(stderr, "\t%s attach dest [-l lockfile]\n", p);
fprintf(stderr, "\t%s detach dest\n", p);
fprintf(stderr, "\t%s init /dev/dest [-i] [-f filename] [-L lockfile]\n", p);
fprintf(stderr, "\t%s setkey dest [-n key] [-l lockfile] [-L lockfile]\n", p);
fprintf(stderr, "\t%s destroy dest [-n key] [-l lockfile] [-L lockfile]\n", p);
exit (1);
}
void *
g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error)
{
void *p;
int fd, i;
off_t o2;
p = malloc(length);
if (p == NULL)
err(1, "malloc");
fd = *(int *)cp;
o2 = lseek(fd, offset, SEEK_SET);
if (o2 != offset)
err(1, "lseek");
i = read(fd, p, length);
if (i != length)
err(1, "read");
if (error != NULL)
error = 0;
return (p);
}
static void
random_bits(void *p, u_int len)
{
static int fdr = -1;
int i;
if (fdr < 0) {
fdr = open("/dev/urandom", O_RDONLY);
if (fdr < 0)
err(1, "/dev/urandom");
}
i = read(fdr, p, len);
if (i != (int)len)
err(1, "read from /dev/urandom");
}
/* XXX: not nice */
static u_char sha2[SHA512_DIGEST_LENGTH];
static void
reset_passphrase(struct g_bde_softc *sc)
{
memcpy(sc->sha2, sha2, SHA512_DIGEST_LENGTH);
}
static void
setup_passphrase(struct g_bde_softc *sc, int sure, const char *input)
{
char buf1[BUFSIZ], buf2[BUFSIZ], *p;
if (input != NULL) {
g_bde_hash_pass(sc, input, strlen(input));
memcpy(sha2, sc->sha2, SHA512_DIGEST_LENGTH);
return;
}
for (;;) {
p = readpassphrase(
sure ? "Enter new passphrase:" : "Enter passphrase: ",
buf1, sizeof buf1,
RPP_ECHO_OFF | RPP_REQUIRE_TTY);
if (p == NULL)
err(1, "readpassphrase");
if (sure) {
p = readpassphrase("Reenter new passphrase: ",
buf2, sizeof buf2,
RPP_ECHO_OFF | RPP_REQUIRE_TTY);
if (p == NULL)
err(1, "readpassphrase");
if (strcmp(buf1, buf2)) {
printf("They didn't match.\n");
continue;
}
}
if (strlen(buf1) < 3) {
printf("Too short passphrase.\n");
continue;
}
break;
}
g_bde_hash_pass(sc, buf1, strlen(buf1));
memcpy(sha2, sc->sha2, SHA512_DIGEST_LENGTH);
}
static void
encrypt_sector(void *d, int len, int klen, void *key)
{
keyInstance ki;
cipherInstance ci;
int error;
error = rijndael_cipherInit(&ci, MODE_CBC, NULL);
if (error <= 0)
errx(1, "rijndael_cipherInit=%d", error);
error = rijndael_makeKey(&ki, DIR_ENCRYPT, klen, key);
if (error <= 0)
errx(1, "rijndael_makeKeY=%d", error);
error = rijndael_blockEncrypt(&ci, &ki, d, len * 8, d);
if (error <= 0)
errx(1, "rijndael_blockEncrypt=%d", error);
}
static void
cmd_attach(const struct g_bde_softc *sc, const char *dest, const char *lfile)
{
int gfd, i, ffd;
struct geomconfiggeom gcg;
u_char buf[256 + 16];
gfd = open("/dev/geom.ctl", O_RDWR);
if (gfd < 0)
err(1, "/dev/geom.ctl");
memset(&gcg, 0, sizeof gcg);
gcg.class.u.name = "BDE";
gcg.class.len = strlen(gcg.class.u.name);
gcg.provider.u.name = dest;
gcg.provider.len = strlen(gcg.provider.u.name);
gcg.flag = GCFG_CREATE;
gcg.len = sizeof buf;
gcg.ptr = buf;
if (lfile != NULL) {
ffd = open(lfile, O_RDONLY, 0);
if (ffd < 0)
err(1, lfile);
read(ffd, buf + sizeof(sc->sha2), 16);
close(ffd);
} else {
memset(buf + sizeof(sc->sha2), 0, 16);
}
memcpy(buf, sc->sha2, sizeof(sc->sha2));
i = ioctl(gfd, GEOMCONFIGGEOM, &gcg);
if (i != 0)
err(1, "ioctl(GEOMCONFIGGEOM)");
exit (0);
}
static void
cmd_detach(const char *dest)
{
int i, gfd;
struct geomconfiggeom gcg;
gfd = open("/dev/geom.ctl", O_RDWR);
if (gfd < 0)
err(1, "/dev/geom.ctl");
memset(&gcg, 0, sizeof gcg);
gcg.class.u.name = "BDE";
gcg.class.len = strlen(gcg.class.u.name);
gcg.provider.u.name = dest;
gcg.provider.len = strlen(gcg.provider.u.name);
gcg.flag = GCFG_DISMANTLE;
i = ioctl(gfd, GEOMCONFIGGEOM, &gcg);
if (i != 0)
err(1, "ioctl(GEOMCONFIGGEOM)");
exit (0);
}
static void
cmd_open(struct g_bde_softc *sc, int dfd , const char *l_opt, u_int *nkey)
{
int error;
int ffd;
u_char keyloc[16];
u_int sectorsize;
off_t mediasize;
struct stat st;
error = ioctl(dfd, DIOCGSECTORSIZE, &sectorsize);
if (error)
sectorsize = 512;
error = ioctl(dfd, DIOCGMEDIASIZE, &mediasize);
if (error) {
error = fstat(dfd, &st);
if (error == 0 && S_ISREG(st.st_mode))
mediasize = st.st_size;
else
error = ENOENT;
}
if (error)
mediasize = (off_t)-1;
if (l_opt != NULL) {
ffd = open(l_opt, O_RDONLY, 0);
if (ffd < 0)
err(1, l_opt);
read(ffd, keyloc, sizeof keyloc);
close(ffd);
} else {
memset(keyloc, 0, sizeof keyloc);
}
error = g_bde_decrypt_lock(sc, sc->sha2, keyloc, mediasize,
sectorsize, nkey);
if (error == ENOENT)
errx(1, "Lock was destroyed.");
if (error == ESRCH)
errx(1, "Lock was nuked.");
if (error == ENOTDIR)
errx(1, "Lock not found");
if (error != 0)
errx(1, "Error %d decrypting lock", error);
if (nkey)
printf("Opened with key %u\n", *nkey);
return;
}
static void
cmd_nuke(struct g_bde_key *gl, int dfd , int key)
{
int i;
u_char *sbuf;
off_t offset, offset2;
sbuf = malloc(gl->sectorsize);
memset(sbuf, 0, gl->sectorsize);
offset = (gl->lsector[key] & ~(gl->sectorsize - 1));
offset2 = lseek(dfd, offset, SEEK_SET);
if (offset2 != offset)
err(1, "lseek");
i = write(dfd, sbuf, gl->sectorsize);
if (i != (int)gl->sectorsize)
err(1, "write");
printf("Nuked key %d\n", key);
}
static void
cmd_write(struct g_bde_key *gl, struct g_bde_softc *sc, int dfd , int key, const char *l_opt)
{
int i, ffd;
uint64_t off[2];
u_char keyloc[16];
u_char *sbuf, *q;
off_t offset, offset2;
sbuf = malloc(gl->sectorsize);
/*
* Find the byte-offset in the lock sector where we will put the lock
* data structure. We can put it any random place as long as the
* structure fits.
*/
for(;;) {
random_bits(off, sizeof off);
off[0] &= (gl->sectorsize - 1);
if (off[0] + G_BDE_LOCKSIZE > gl->sectorsize)
continue;
break;
}
/* Add the sector offset in bytes */
off[0] += (gl->lsector[key] & ~(gl->sectorsize - 1));
gl->lsector[key] = off[0];
i = g_bde_keyloc_encrypt(sc, off, keyloc);
if (i)
errx(1, "g_bde_keyloc_encrypt()");
if (l_opt != NULL) {
ffd = open(l_opt, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (ffd < 0)
err(1, l_opt);
write(ffd, keyloc, sizeof keyloc);
close(ffd);
} else if (gl->flags & 1) {
offset2 = lseek(dfd, 0, SEEK_SET);
if (offset2 != 0)
err(1, "lseek");
i = read(dfd, sbuf, gl->sectorsize);
if (i != (int)gl->sectorsize)
err(1, "read");
memcpy(sbuf + key * 16, keyloc, sizeof keyloc);
offset2 = lseek(dfd, 0, SEEK_SET);
if (offset2 != 0)
err(1, "lseek");
i = write(dfd, sbuf, gl->sectorsize);
if (i != (int)gl->sectorsize)
err(1, "write");
} else {
errx(1, "No -L option and no space in sector 0 for lockfile");
}
/* Allocate a sectorbuffer and fill it with random junk */
if (sbuf == NULL)
err(1, "malloc");
random_bits(sbuf, gl->sectorsize);
/* Fill random bits in the spare field */
random_bits(gl->spare, sizeof(gl->spare));
/* Encode the structure where we want it */
q = sbuf + (off[0] % gl->sectorsize);
i = g_bde_encode_lock(sc, gl, q);
if (i < 0)
errx(1, "programming error encoding lock");
encrypt_sector(q, G_BDE_LOCKSIZE, 256, sc->sha2 + 16);
offset = gl->lsector[key] & ~(gl->sectorsize - 1);
offset2 = lseek(dfd, offset, SEEK_SET);
if (offset2 != offset)
err(1, "lseek");
i = write(dfd, sbuf, gl->sectorsize);
if (i != (int)gl->sectorsize)
err(1, "write");
printf("Wrote key %d at %jd\n", key, (intmax_t)offset);
#if 0
printf("s0 = %jd\n", (intmax_t)gl->sector0);
printf("sN = %jd\n", (intmax_t)gl->sectorN);
printf("l[0] = %jd\n", (intmax_t)gl->lsector[0]);
printf("l[1] = %jd\n", (intmax_t)gl->lsector[1]);
printf("l[2] = %jd\n", (intmax_t)gl->lsector[2]);
printf("l[3] = %jd\n", (intmax_t)gl->lsector[3]);
printf("k = %jd\n", (intmax_t)gl->keyoffset);
printf("ss = %jd\n", (intmax_t)gl->sectorsize);
#endif
}
static void
cmd_destroy(struct g_bde_key *gl, int nkey)
{
int i;
bzero(&gl->sector0, sizeof gl->sector0);
bzero(&gl->sectorN, sizeof gl->sectorN);
bzero(&gl->keyoffset, sizeof gl->keyoffset);
bzero(&gl->flags, sizeof gl->flags);
bzero(gl->mkey, sizeof gl->mkey);
for (i = 0; i < G_BDE_MAXKEYS; i++)
if (i != nkey)
gl->lsector[i] = ~0;
}
static int
sorthelp(const void *a, const void *b)
{
const off_t *oa, *ob;
oa = a;
ob = b;
return (*oa - *ob);
}
static void
cmd_init(struct g_bde_key *gl, int dfd, const char *f_opt, int i_opt, const char *l_opt)
{
int i;
u_char *buf;
unsigned sector_size;
uint64_t first_sector;
uint64_t last_sector;
uint64_t total_sectors;
off_t off, off2;
unsigned nkeys;
const char *p;
char *q, cbuf[BUFSIZ];
unsigned u, u2;
uint64_t o;
properties params;
bzero(gl, sizeof *gl);
if (f_opt != NULL) {
i = open(f_opt, O_RDONLY);
if (i < 0)
err(1, f_opt);
params = properties_read(i);
close (i);
} else {
/* XXX: Polish */
q = strdup("/tmp/temp.XXXXXXXXXX");
i = mkstemp(q);
if (i < 0)
err(1, q);
write(i, template, strlen(template));
close (i);
if (i_opt) {
p = getenv("EDITOR");
if (p == NULL)
p = "vi";
sprintf(cbuf, "%s %s\n", p, q);
system(cbuf);
}
i = open(q, O_RDONLY);
if (i < 0)
err(1, f_opt);
params = properties_read(i);
close (i);
unlink(q);
}
/* <sector_size> */
p = property_find(params, "sector_size");
i = ioctl(dfd, DIOCGSECTORSIZE, &u);
if (p != NULL) {
sector_size = strtoul(p, &q, 0);
if (!*p || *q)
errx(1, "sector_size not a proper number");
} else if (i == 0) {
sector_size = u;
} else {
errx(1, "Missing sector_size property");
}
if (sector_size & (sector_size - 1))
errx(1, "sector_size not a power of 2");
if (sector_size < 512)
errx(1, "sector_size is smaller than 512");
buf = malloc(sector_size);
if (buf == NULL)
err(1, "Failed to malloc sector buffer");
gl->sectorsize = sector_size;
i = ioctl(dfd, DIOCGMEDIASIZE, &off);
if (i == 0) {
first_sector = 0;
total_sectors = off / sector_size;
last_sector = total_sectors - 1;
} else {
first_sector = 0;
last_sector = 0;
total_sectors = 0;
}
/* <first_sector> */
p = property_find(params, "first_sector");
if (p != NULL) {
first_sector = strtoul(p, &q, 0);
if (!*p || *q)
errx(1, "first_sector not a proper number");
}
/* <last_sector> */
p = property_find(params, "last_sector");
if (p != NULL) {
last_sector = strtoul(p, &q, 0);
if (!*p || *q)
errx(1, "last_sector not a proper number");
if (last_sector <= first_sector)
errx(1, "last_sector not larger than first_sector");
total_sectors = last_sector + 1;
}
/* <total_sectors> */
p = property_find(params, "total_sectors");
if (p != NULL) {
total_sectors = strtoul(p, &q, 0);
if (!*p || *q)
errx(1, "total_sectors not a proper number");
if (last_sector == 0)
last_sector = first_sector + total_sectors - 1;
}
if (l_opt == NULL && first_sector != 0)
errx(1, "No -L new-lockfile argument and first_sector != 0");
else if (l_opt == NULL) {
first_sector++;
total_sectors--;
gl->flags |= 1;
}
gl->sector0 = first_sector * gl->sectorsize;
if (total_sectors != (last_sector - first_sector) + 1)
errx(1, "total_sectors disagree with first_sector and last_sector");
if (total_sectors == 0)
errx(1, "missing last_sector or total_sectors");
gl->sectorN = (last_sector + 1) * gl->sectorsize;
/* Find a random keyoffset */
random_bits(&o, sizeof o);
o %= (gl->sectorN - gl->sector0);
o &= ~(gl->sectorsize - 1);
gl->keyoffset = o;
/* <number_of_keys> */
p = property_find(params, "number_of_keys");
if (p == NULL)
errx(1, "Missing number_of_keys property");
nkeys = strtoul(p, &q, 0);
if (!*p || *q)
errx(1, "number_of_keys not a proper number");
if (nkeys < 1 || nkeys > G_BDE_MAXKEYS)
errx(1, "number_of_keys out of range");
for (u = 0; u < nkeys; u++) {
for(;;) {
do {
random_bits(&o, sizeof o);
o %= gl->sectorN;
o &= ~(gl->sectorsize - 1);
} while(o < gl->sector0);
for (u2 = 0; u2 < u; u2++)
if (o == gl->lsector[u2])
break;
if (u2 < u)
continue;
break;
}
gl->lsector[u] = o;
}
for (; u < G_BDE_MAXKEYS; u++) {
do
random_bits(&o, sizeof o);
while (o < gl->sectorN);
gl->lsector[u] = o;
}
qsort(gl->lsector, G_BDE_MAXKEYS, sizeof gl->lsector[0], sorthelp);
/* Flush sector zero if we use it for lockfile data */
if (gl->flags & 1) {
off2 = lseek(dfd, 0, SEEK_SET);
if (off2 != 0)
err(1, "lseek(2) to sector 0");
random_bits(buf, sector_size);
i = write(dfd, buf, sector_size);
if (i != (int)sector_size)
err(1, "write sector 0");
}
/* <random_flush> */
p = property_find(params, "random_flush");
if (p != NULL) {
off = first_sector * sector_size;
off2 = lseek(dfd, off, SEEK_SET);
if (off2 != off)
err(1, "lseek(2) to first_sector");
off2 = last_sector * sector_size;
while (off <= off2) {
random_bits(buf, sector_size);
i = write(dfd, buf, sector_size);
if (i != (int)sector_size)
err(1, "write to $device_name");
off += sector_size;
}
}
random_bits(gl->mkey, sizeof gl->mkey);
random_bits(gl->salt, sizeof gl->salt);
return;
}
static enum action {
ACT_HUH,
ACT_ATTACH, ACT_DETACH,
ACT_INIT, ACT_SETKEY, ACT_DESTROY, ACT_NUKE
} action;
int
main(int argc, char **argv)
{
const char *opts;
const char *l_opt, *L_opt;
const char *p_opt, *P_opt;
const char *f_opt;
char *dest;
int i_opt, n_opt, ch, dfd, doopen;
u_int nkey;
int i;
char *q, buf[BUFSIZ];
struct g_bde_key *gl;
struct g_bde_softc sc;
if (argc < 3)
usage("Too few arguments\n");
doopen = 0;
if (!strcmp(argv[1], "attach")) {
action = ACT_ATTACH;
opts = "l:p:";
} else if (!strcmp(argv[1], "detach")) {
action = ACT_DETACH;
opts = "";
} else if (!strcmp(argv[1], "init")) {
action = ACT_INIT;
doopen = 1;
opts = "f:iL:P:";
} else if (!strcmp(argv[1], "setkey")) {
action = ACT_SETKEY;
doopen = 1;
opts = "n:l:L:p:P:";
} else if (!strcmp(argv[1], "destroy")) {
action = ACT_DESTROY;
doopen = 1;
opts = "l:p:";
} else if (!strcmp(argv[1], "nuke")) {
action = ACT_NUKE;
doopen = 1;
opts = "l:p:n:";
} else {
usage("Unknown sub command\n");
}
argc--;
argv++;
dest = strdup(argv[1]);
argc--;
argv++;
p_opt = NULL;
P_opt = NULL;
l_opt = NULL;
L_opt = NULL;
f_opt = NULL;
n_opt = 0;
i_opt = 0;
while((ch = getopt(argc, argv, opts)) != -1)
switch (ch) {
case 'f':
f_opt = optarg;
break;
case 'i':
i_opt = !i_opt;
case 'l':
l_opt = optarg;
break;
case 'L':
L_opt = optarg;
break;
case 'p':
p_opt = optarg;
break;
case 'P':
P_opt = optarg;
break;
case 'n':
n_opt = strtoul(optarg, &q, 0);
if (!*optarg || *q)
usage("-n argument not numeric\n");
if (n_opt < -1 || n_opt > G_BDE_MAXKEYS)
usage("-n argument out of range\n"); break;
default:
usage("Invalid option\n");
}
if (doopen) {
dfd = open(dest, O_RDWR | O_CREAT, 0644);
if (dfd < 0) {
sprintf(buf, "%s%s", _PATH_DEV, dest);
dfd = open(buf, O_RDWR | O_CREAT, 0644);
}
if (dfd < 0)
err(1, dest);
} else {
if (!memcmp(dest, _PATH_DEV, strlen(_PATH_DEV)))
strcpy(dest, dest + strlen(_PATH_DEV));
if (strchr(dest, '/'))
usage("\"dest\" argument must be geom-name\n");
}
memset(&sc, 0, sizeof sc);
sc.consumer = (void *)&dfd;
gl = &sc.key;
switch(action) {
case ACT_ATTACH:
setup_passphrase(&sc, 0, p_opt);
cmd_attach(&sc, dest, l_opt);
break;
case ACT_DETACH:
cmd_detach(dest);
break;
case ACT_INIT:
cmd_init(gl, dfd, f_opt, i_opt, L_opt);
setup_passphrase(&sc, 1, P_opt);
cmd_write(gl, &sc, dfd, 0, L_opt);
break;
case ACT_SETKEY:
setup_passphrase(&sc, 0, p_opt);
cmd_open(&sc, dfd, l_opt, &nkey);
if (n_opt == 0)
n_opt = nkey + 1;
setup_passphrase(&sc, 1, P_opt);
cmd_write(gl, &sc, dfd, n_opt - 1, L_opt);
break;
case ACT_DESTROY:
setup_passphrase(&sc, 0, p_opt);
cmd_open(&sc, dfd, l_opt, &nkey);
cmd_destroy(gl, nkey);
reset_passphrase(&sc);
cmd_write(gl, &sc, dfd, nkey, l_opt);
break;
case ACT_NUKE:
setup_passphrase(&sc, 0, p_opt);
cmd_open(&sc, dfd, l_opt, &nkey);
if (n_opt == 0)
n_opt = nkey + 1;
if (n_opt == -1) {
for(i = 0; i < G_BDE_MAXKEYS; i++)
cmd_nuke(gl, dfd, i);
} else {
cmd_nuke(gl, dfd, n_opt - 1);
}
break;
default:
usage("Internal error\n");
}
return(0);
}
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