346 lines
9.0 KiB
C
346 lines
9.0 KiB
C
/* opiekey.c: Stand-alone program for computing responses to OTP challenges.
|
|
|
|
Takes a sequence number and seed (presumably from an OPIE challenge)
|
|
as command line arguments, prompts for the user's secret pass phrase,
|
|
and outputs a response.
|
|
|
|
%%% portions-copyright-cmetz-96
|
|
Portions of this software are Copyright 1996-1998 by Craig Metz, All Rights
|
|
Reserved. The Inner Net License Version 2 applies to these portions of
|
|
the software.
|
|
You should have received a copy of the license with this software. If
|
|
you didn't get a copy, you may request one from <license@inner.net>.
|
|
|
|
Portions of this software are Copyright 1995 by Randall Atkinson and Dan
|
|
McDonald, All Rights Reserved. All Rights under this copyright are assigned
|
|
to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
|
|
License Agreement applies to this software.
|
|
|
|
History:
|
|
|
|
Modified by cmetz for OPIE 2.31. Renamed "init" and RESPONSE_INIT
|
|
to "init-hex" and RESPONSE_INIT_HEX. Removed active attack
|
|
protection support.
|
|
Modified by cmetz for OPIE 2.3. OPIE_PASS_MAX changed to
|
|
OPIE_SECRET_MAX. Added extended responses, which created
|
|
lots of changes. Eliminated extra variable. Added -x and
|
|
-t to help. Added -f flag. Added SHA support.
|
|
Modified by cmetz for OPIE 2.22. Print newline after seed too long
|
|
message. Check for minimum seed length. Correct a grammar
|
|
error.
|
|
Modified at NRL for OPIE 2.2. Check opiereadpass() return.
|
|
Change opiereadpass() calls to add echo arg. Use FUNCTION
|
|
definition et al. Check seed length here, too. Added back
|
|
hex output. Reworked final output function.
|
|
Modified at NRL for OPIE 2.0.
|
|
Written at Bellcore for the S/Key Version 1 software distribution
|
|
(skey.c).
|
|
|
|
$FreeBSD$
|
|
|
|
*/
|
|
#include "opie_cfg.h"
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "opie.h"
|
|
|
|
#ifdef __MSDOS__
|
|
#include <dos.h>
|
|
#endif
|
|
|
|
#if HAVE_FCNTL_H
|
|
#include <fcntl.h>
|
|
#endif /* HAVE_FCNTL_H */
|
|
|
|
extern char *optarg;
|
|
extern int optind, opterr;
|
|
|
|
int aflag = 0;
|
|
|
|
char *algnames[] = { NULL, NULL, NULL, "SHA-1", "MD4", "MD5" };
|
|
char *algids[] = { NULL, NULL, NULL, "sha1", "md4", "md5" };
|
|
|
|
/******** Begin real source code ***************/
|
|
|
|
static VOIDRET usage FUNCTION((s), char *s)
|
|
{
|
|
fprintf(stderr, "usage: %s [-v] [-h] [-f] [-x] [-t type] [-4 | -5 | -s] [-a] [-n count] sequence_number seed\n", s);
|
|
exit(1);
|
|
}
|
|
|
|
#define RESPONSE_STANDARD 0
|
|
#define RESPONSE_WORD 1
|
|
#define RESPONSE_HEX 2
|
|
#define RESPONSE_INIT_HEX 3
|
|
#define RESPONSE_INIT_WORD 4
|
|
#define RESPONSE_UNKNOWN 5
|
|
|
|
struct _rtrans {
|
|
int type;
|
|
char *name;
|
|
};
|
|
|
|
static struct _rtrans rtrans[] = {
|
|
{ RESPONSE_WORD, "word" },
|
|
{ RESPONSE_HEX, "hex" },
|
|
{ RESPONSE_INIT_HEX, "init-hex" },
|
|
{ RESPONSE_INIT_WORD, "init-word" },
|
|
{ RESPONSE_STANDARD, "" },
|
|
{ RESPONSE_STANDARD, "standard" },
|
|
{ RESPONSE_STANDARD, "otp" },
|
|
{ RESPONSE_UNKNOWN, NULL }
|
|
};
|
|
|
|
static void getsecret FUNCTION((secret, promptextra, retype), char *secret AND char *promptextra AND int flags)
|
|
{
|
|
fprintf(stderr, "Enter %ssecret pass phrase: ", promptextra);
|
|
if (!opiereadpass(secret, OPIE_SECRET_MAX, 0)) {
|
|
fprintf(stderr, "Error reading %ssecret pass phrase!\n", promptextra);
|
|
exit(1);
|
|
}
|
|
if (secret[0] && (flags & 1)) {
|
|
char verify[OPIE_SECRET_MAX + 1];
|
|
|
|
fprintf(stderr, "Again %ssecret pass phrase: ", promptextra);
|
|
if (!opiereadpass(verify, OPIE_SECRET_MAX, 0)) {
|
|
fprintf(stderr, "Error reading %ssecret pass phrase!\n", promptextra);
|
|
memset(verify, 0, sizeof(verify));
|
|
memset(secret, 0, sizeof(secret));
|
|
exit(1);
|
|
}
|
|
if (verify[0] && strcmp(verify, secret)) {
|
|
fprintf(stderr, "They don't match. Try again.\n");
|
|
memset(verify, 0, sizeof(verify));
|
|
memset(secret, 0, sizeof(secret));
|
|
exit(1);
|
|
}
|
|
memset(verify, 0, sizeof(verify));
|
|
}
|
|
if (!(flags & 2) && !aflag && opiepasscheck(secret)) {
|
|
memset(secret, 0, sizeof(secret));
|
|
fprintf(stderr, "Secret pass phrases must be between %d and %d characters long.\n", OPIE_SECRET_MIN, OPIE_SECRET_MAX);
|
|
exit(1);
|
|
};
|
|
}
|
|
|
|
int main FUNCTION((argc, argv), int argc AND char *argv[])
|
|
{
|
|
/* variable declarations */
|
|
unsigned algorithm = MDX; /* default algorithm per Makefile's MDX
|
|
symbol */
|
|
int keynum = 0;
|
|
int i;
|
|
int count = 1;
|
|
char secret[OPIE_SECRET_MAX + 1], newsecret[OPIE_SECRET_MAX + 1];
|
|
char key[8], newkey[8];
|
|
char *seed, newseed[OPIE_SEED_MAX + 1];
|
|
char response[OPIE_RESPONSE_MAX + 1];
|
|
char *slash;
|
|
int hex = 0;
|
|
int type = RESPONSE_STANDARD;
|
|
int force = 0;
|
|
|
|
if (slash = strchr(argv[0], '/'))
|
|
slash++;
|
|
else
|
|
slash = argv[0];
|
|
|
|
if (!strcmp(slash, "key") || strstr(slash, "md4"))
|
|
algorithm = 4;
|
|
|
|
if (strstr(slash, "md5"))
|
|
algorithm = 5;
|
|
|
|
if (strstr(slash, "sha"))
|
|
algorithm = 3;
|
|
|
|
while ((i = getopt(argc, argv, "fhvn:x45at:s")) != EOF) {
|
|
switch (i) {
|
|
case 'v':
|
|
opieversion();
|
|
|
|
case 'n':
|
|
count = atoi(optarg);
|
|
break;
|
|
|
|
case 'x':
|
|
hex = 1;
|
|
break;
|
|
|
|
case 'f':
|
|
#if INSECURE_OVERRIDE
|
|
force = 1;
|
|
#else /* INSECURE_OVERRIDE */
|
|
fprintf(stderr, "Sorry, but the -f option is not supported by this build of OPIE.\n");
|
|
#endif /* INSECURE_OVERRIDE */
|
|
break;
|
|
|
|
case '4':
|
|
/* use MD4 algorithm */
|
|
algorithm = 4;
|
|
break;
|
|
|
|
case '5':
|
|
/* use MD5 algorithm */
|
|
algorithm = 5;
|
|
break;
|
|
|
|
case 'a':
|
|
aflag = 1;
|
|
break;
|
|
|
|
case 't':
|
|
{
|
|
struct _rtrans *r;
|
|
for (r = rtrans; r->name && strcmp(r->name, optarg); r++);
|
|
if (!r->name) {
|
|
fprintf(stderr, "%s: %s: unknown response type.\n", argv[0], optarg);
|
|
exit(1);
|
|
}
|
|
type = r->type;
|
|
}
|
|
break;
|
|
|
|
case 's':
|
|
algorithm = 3;
|
|
break;
|
|
|
|
default:
|
|
usage(argv[0]);
|
|
}
|
|
}
|
|
|
|
if ((argc - optind) < 2)
|
|
usage(argv[0]);
|
|
|
|
fprintf(stderr, "Using the %s algorithm to compute response.\n", algnames[algorithm]);
|
|
|
|
/* get sequence number, which is next-to-last parameter */
|
|
keynum = atoi(argv[optind]);
|
|
if (keynum < 1) {
|
|
fprintf(stderr, "Sequence number %s is not positive.\n", argv[optind]);
|
|
exit(1);
|
|
}
|
|
/* get seed string, which is last parameter */
|
|
seed = argv[optind + 1];
|
|
{
|
|
i = strlen(seed);
|
|
|
|
if (i > OPIE_SEED_MAX) {
|
|
fprintf(stderr, "Seeds must be less than %d characters long.\n", OPIE_SEED_MAX);
|
|
exit(1);
|
|
}
|
|
if (i < OPIE_SEED_MIN) {
|
|
fprintf(stderr, "Seeds must be greater than %d characters long.\n", OPIE_SEED_MIN);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
fprintf(stderr, "Reminder: Don't use opiekey from telnet or dial-in sessions.\n");
|
|
|
|
if (opieinsecure()) {
|
|
fprintf(stderr, "Sorry, but you don't seem to be on the console or a secure terminal.\n");
|
|
#if INSECURE_OVERRIDE
|
|
if (force)
|
|
fprintf(stderr, "Warning: Continuing could disclose your secret pass phrase to an attacker!\n");
|
|
else
|
|
#endif /* INSECURE_OVERRIDE */
|
|
exit(1);
|
|
}
|
|
|
|
if ((type == RESPONSE_INIT_HEX) || (type == RESPONSE_INIT_WORD)) {
|
|
#if RETYPE
|
|
getsecret(secret, "old ", 1);
|
|
#else /* RETYPE */
|
|
getsecret(secret, "old ", 0);
|
|
#endif /* RETYPE */
|
|
getsecret(newsecret, "new ", 1);
|
|
if (!newsecret[0])
|
|
strcpy(newsecret, secret);
|
|
|
|
if (opienewseed(strcpy(newseed, seed)) < 0) {
|
|
fprintf(stderr, "Error updating seed.\n");
|
|
goto error;
|
|
}
|
|
|
|
if (opiekeycrunch(algorithm, newkey, newseed, newsecret)) {
|
|
fprintf(stderr, "%s: key crunch failed (1)\n", argv[0]);
|
|
goto error;
|
|
}
|
|
|
|
for (i = 0; i < 499; i++)
|
|
opiehash(newkey, algorithm);
|
|
} else
|
|
#if RETYPE
|
|
getsecret(secret, "", 1);
|
|
#else /* RETYPE */
|
|
getsecret(secret, "", 0);
|
|
#endif /* RETYPE */
|
|
|
|
/* Crunch seed and secret password into starting key normally */
|
|
if (opiekeycrunch(algorithm, key, seed, secret)) {
|
|
fprintf(stderr, "%s: key crunch failed\n", argv[0]);
|
|
goto error;
|
|
}
|
|
|
|
for (i = 0; i <= (keynum - count); i++)
|
|
opiehash(key, algorithm);
|
|
|
|
{
|
|
char buf[OPIE_SEED_MAX + 48 + 1];
|
|
char *c;
|
|
|
|
for (; i <= keynum; i++) {
|
|
if (count > 1)
|
|
printf("%d: %s", i, (type == RESPONSE_STANDARD) ? "" : "\n");
|
|
|
|
switch(type) {
|
|
case RESPONSE_STANDARD:
|
|
if (hex)
|
|
opiebtoh(response, key);
|
|
else
|
|
opiebtoe(response, key);
|
|
break;
|
|
case RESPONSE_WORD:
|
|
strcpy(response, "word:");
|
|
strcat(response, opiebtoe(buf, key));
|
|
break;
|
|
case RESPONSE_HEX:
|
|
strcpy(response, "hex:");
|
|
strcat(response, opiebtoh(buf, key));
|
|
break;
|
|
case RESPONSE_INIT_HEX:
|
|
case RESPONSE_INIT_WORD:
|
|
if (type == RESPONSE_INIT_HEX) {
|
|
strcpy(response, "init-hex:");
|
|
strcat(response, opiebtoh(buf, key));
|
|
sprintf(buf, ":%s 499 %s:", algids[algorithm], newseed);
|
|
strcat(response, buf);
|
|
strcat(response, opiebtoh(buf, newkey));
|
|
} else {
|
|
strcpy(response, "init-word:");
|
|
strcat(response, opiebtoe(buf, key));
|
|
sprintf(buf, ":%s 499 %s:", algids[algorithm], newseed);
|
|
strcat(response, buf);
|
|
strcat(response, opiebtoe(buf, newkey));
|
|
}
|
|
break;
|
|
}
|
|
puts(response);
|
|
opiehash(key, algorithm);
|
|
}
|
|
}
|
|
|
|
memset(secret, 0, sizeof(secret));
|
|
memset(newsecret, 0, sizeof(newsecret));
|
|
return 0;
|
|
|
|
error:
|
|
memset(secret, 0, sizeof(secret));
|
|
memset(newsecret, 0, sizeof(newsecret));
|
|
return 1;
|
|
}
|