343 lines
9.0 KiB
C
343 lines
9.0 KiB
C
/* opiekey.c: Stand-alone program for computing responses to OTP challenges.
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Takes a sequence number and seed (presumably from an OPIE challenge)
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as command line arguments, prompts for the user's secret pass phrase,
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and outputs a response.
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%%% portions-copyright-cmetz-96
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Portions of this software are Copyright 1996-1997 by Craig Metz, All Rights
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Reserved. The Inner Net License Version 2 applies to these portions of
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the software.
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You should have received a copy of the license with this software. If
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you didn't get a copy, you may request one from <license@inner.net>.
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Portions of this software are Copyright 1995 by Randall Atkinson and Dan
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McDonald, All Rights Reserved. All Rights under this copyright are assigned
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to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
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License Agreement applies to this software.
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History:
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Modified by cmetz for OPIE 2.31. Renamed "init" and RESPONSE_INIT
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to "init-hex" and RESPONSE_INIT_HEX. Removed active attack
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protection support.
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Modified by cmetz for OPIE 2.3. OPIE_PASS_MAX changed to
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OPIE_SECRET_MAX. Added extended responses, which created
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lots of changes. Eliminated extra variable. Added -x and
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-t to help. Added -f flag. Added SHA support.
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Modified by cmetz for OPIE 2.22. Print newline after seed too long
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message. Check for minimum seed length. Correct a grammar
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error.
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Modified at NRL for OPIE 2.2. Check opiereadpass() return.
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Change opiereadpass() calls to add echo arg. Use FUNCTION
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definition et al. Check seed length here, too. Added back
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hex output. Reworked final output function.
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Modified at NRL for OPIE 2.0.
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Written at Bellcore for the S/Key Version 1 software distribution
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(skey.c).
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*/
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#include "opie_cfg.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "opie.h"
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#ifdef __MSDOS__
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#include <dos.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif /* HAVE_FCNTL_H */
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extern char *optarg;
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extern int optind, opterr;
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int aflag = 0;
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char *algnames[] = { NULL, NULL, NULL, "SHA-1", "MD4", "MD5" };
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char *algids[] = { NULL, NULL, NULL, "sha1", "md4", "md5" };
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/******** Begin real source code ***************/
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static VOIDRET usage FUNCTION((s), char *s)
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{
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fprintf(stderr, "usage: %s [-v] [-h] [-f] [-x] [-t type] [-4 | -5 | -s] [-a] [-n count] sequence_number seed\n", s);
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exit(1);
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}
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#define RESPONSE_STANDARD 0
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#define RESPONSE_WORD 1
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#define RESPONSE_HEX 2
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#define RESPONSE_INIT_HEX 3
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#define RESPONSE_INIT_WORD 4
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#define RESPONSE_UNKNOWN 5
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struct _rtrans {
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int type;
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char *name;
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};
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static struct _rtrans rtrans[] = {
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{ RESPONSE_WORD, "word" },
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{ RESPONSE_HEX, "hex" },
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{ RESPONSE_INIT_HEX, "init-hex" },
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{ RESPONSE_INIT_WORD, "init-word" },
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{ RESPONSE_STANDARD, "" },
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{ RESPONSE_STANDARD, "standard" },
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{ RESPONSE_STANDARD, "otp" },
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{ RESPONSE_UNKNOWN, NULL }
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};
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static void getsecret FUNCTION((secret, promptextra, retype), char *secret AND char *promptextra AND int flags)
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{
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fprintf(stderr, "Enter %ssecret pass phrase: ", promptextra);
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if (!opiereadpass(secret, OPIE_SECRET_MAX, 0)) {
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fprintf(stderr, "Error reading %ssecret pass phrase!\n", promptextra);
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exit(1);
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}
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if (secret[0] && (flags & 1)) {
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char verify[OPIE_SECRET_MAX + 1];
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fprintf(stderr, "Again %ssecret pass phrase: ", promptextra);
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if (!opiereadpass(verify, OPIE_SECRET_MAX, 0)) {
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fprintf(stderr, "Error reading %ssecret pass phrase!\n", promptextra);
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memset(verify, 0, sizeof(verify));
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memset(secret, 0, sizeof(secret));
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exit(1);
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}
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if (verify[0] && strcmp(verify, secret)) {
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fprintf(stderr, "They don't match. Try again.\n");
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memset(verify, 0, sizeof(verify));
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memset(secret, 0, sizeof(secret));
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exit(1);
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}
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memset(verify, 0, sizeof(verify));
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}
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if (!(flags & 2) && opiepasscheck(secret)) {
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memset(secret, 0, sizeof(secret));
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fprintf(stderr, "Secret pass phrases must be between %d and %d characters long.\n", OPIE_SECRET_MIN, OPIE_SECRET_MAX);
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exit(1);
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};
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}
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int main FUNCTION((argc, argv), int argc AND char *argv[])
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{
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/* variable declarations */
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unsigned algorithm = MDX; /* default algorithm per Makefile's MDX
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symbol */
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int keynum = 0;
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int i;
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int count = 1;
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char secret[OPIE_SECRET_MAX + 1], newsecret[OPIE_SECRET_MAX + 1];
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char key[8], newkey[8];
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char *seed, newseed[OPIE_SEED_MAX + 1];
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char response[OPIE_RESPONSE_MAX + 1];
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char *slash;
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int hex = 0;
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int type = RESPONSE_STANDARD;
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int force;
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if (slash = strchr(argv[0], '/'))
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slash++;
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else
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slash = argv[0];
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if (!strcmp(slash, "key") || strstr(slash, "md4"))
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algorithm = 4;
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if (strstr(slash, "md5"))
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algorithm = 5;
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if (strstr(slash, "sha"))
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algorithm = 3;
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while ((i = getopt(argc, argv, "fhvn:x45at:s")) != EOF) {
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switch (i) {
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case 'v':
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opieversion();
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case 'n':
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count = atoi(optarg);
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break;
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case 'x':
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hex = 1;
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break;
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case 'f':
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#if INSECURE_OVERRIDE
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force = 1;
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#else /* INSECURE_OVERRIDE */
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fprintf(stderr, "Sorry, but the -f option is not supported by this build of OPIE.\n");
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#endif /* INSECURE_OVERRIDE */
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break;
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case '4':
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/* use MD4 algorithm */
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algorithm = 4;
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break;
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case '5':
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/* use MD5 algorithm */
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algorithm = 5;
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break;
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case 'a':
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aflag = 1;
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break;
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case 't':
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{
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struct _rtrans *r;
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for (r = rtrans; r->name && strcmp(r->name, optarg); r++);
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if (!r->name) {
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fprintf(stderr, "%s: %s: unknown response type.\n", argv[0], optarg);
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exit(1);
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}
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type = r->type;
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}
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break;
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case 's':
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algorithm = 3;
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break;
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default:
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usage(argv[0]);
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}
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}
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if ((argc - optind) < 2)
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usage(argv[0]);
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fprintf(stderr, "Using the %s algorithm to compute response.\n", algnames[algorithm]);
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/* get sequence number, which is next-to-last parameter */
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keynum = atoi(argv[optind]);
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if (keynum < 1) {
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fprintf(stderr, "Sequence number %s is not positive.\n", argv[optind]);
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exit(1);
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}
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/* get seed string, which is last parameter */
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seed = argv[optind + 1];
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{
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i = strlen(seed);
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if (i > OPIE_SEED_MAX) {
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fprintf(stderr, "Seeds must be less than %d characters long.\n", OPIE_SEED_MAX);
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exit(1);
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}
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if (i < OPIE_SEED_MIN) {
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fprintf(stderr, "Seeds must be greater than %d characters long.\n", OPIE_SEED_MIN);
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exit(1);
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}
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}
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fprintf(stderr, "Reminder: Don't use opiekey from telnet or dial-in sessions.\n");
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if (opieinsecure()) {
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fprintf(stderr, "Sorry, but you don't seem to be on the console or a secure terminal.\n");
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#if INSECURE_OVERRIDE
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if (force)
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fprintf(stderr, "Warning: Continuing could disclose your secret pass phrase to an attacker!\n");
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else
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#endif /* INSECURE_OVERRIDE */
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exit(1);
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}
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if ((type == RESPONSE_INIT_HEX) || (type == RESPONSE_INIT_WORD)) {
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#if RETYPE
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getsecret(secret, "old ", 1);
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#else /* RETYPE */
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getsecret(secret, "old ", 0);
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#endif /* RETYPE */
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getsecret(newsecret, "new ", 1);
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if (!newsecret[0])
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strcpy(newsecret, secret);
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if (opienewseed(strcpy(newseed, seed)) < 0) {
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fprintf(stderr, "Error updating seed.\n");
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goto error;
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}
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if (opiekeycrunch(algorithm, newkey, newseed, newsecret)) {
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fprintf(stderr, "%s: key crunch failed (1)\n", argv[0]);
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goto error;
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}
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for (i = 0; i < 499; i++)
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opiehash(newkey, algorithm);
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} else
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#if RETYPE
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getsecret(secret, "", 1);
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#else /* RETYPE */
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getsecret(secret, "", 0);
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#endif /* RETYPE */
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/* Crunch seed and secret password into starting key normally */
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if (opiekeycrunch(algorithm, key, seed, secret)) {
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fprintf(stderr, "%s: key crunch failed\n", argv[0]);
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goto error;
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}
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for (i = 0; i <= (keynum - count); i++)
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opiehash(key, algorithm);
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{
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char buf[OPIE_SEED_MAX + 48 + 1];
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char *c;
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for (; i <= keynum; i++) {
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if (count > 1)
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printf("%d: %s", i, (type == RESPONSE_STANDARD) ? "" : "\n");
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switch(type) {
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case RESPONSE_STANDARD:
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if (hex)
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opiebtoh(response, key);
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else
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opiebtoe(response, key);
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break;
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case RESPONSE_WORD:
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strcpy(response, "word:");
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strcat(response, opiebtoe(buf, key));
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break;
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case RESPONSE_HEX:
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strcpy(response, "hex:");
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strcat(response, opiebtoh(buf, key));
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break;
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case RESPONSE_INIT_HEX:
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case RESPONSE_INIT_WORD:
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if (type == RESPONSE_INIT_HEX) {
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strcpy(response, "init:");
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strcat(response, opiebtoh(buf, key));
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sprintf(buf, ":%s 499 %s:", algids[algorithm], newseed);
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strcat(response, buf);
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strcat(response, opiebtoh(buf, newkey));
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} else {
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strcpy(response, "init-word:");
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strcat(response, opiebtoe(buf, key));
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sprintf(buf, ":%s 499 %s:", algids[algorithm], newseed);
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strcat(response, buf);
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strcat(response, opiebtoe(buf, newkey));
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}
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break;
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}
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puts(response);
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opiehash(key, algorithm);
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}
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}
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memset(secret, 0, sizeof(secret));
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memset(newsecret, 0, sizeof(newsecret));
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return 0;
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error:
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memset(secret, 0, sizeof(secret));
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memset(newsecret, 0, sizeof(newsecret));
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return 1;
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}
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