432 lines
12 KiB
C
432 lines
12 KiB
C
/* opiepasswd.c: Add/change an OTP password in the key database.
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%%% portions-copyright-cmetz-96
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Portions of this software are Copyright 1996-1998 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 2.32. Use OPIE_SEED_MAX instead of
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hard coding the length. Unlock user on failed lookup.
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Modified by cmetz for OPIE 2.3. Got of some variables and made some
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local to where they're used. Split out the finishing code. Use
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opielookup() instead of opiechallenge() to find user. Three
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strikes on prompts. Use opiepasswd()'s new calling
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convention. Changed OPIE_PASS_{MAX,MIN} to
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OPIE_SECRET_{MAX,MIN}. Handle automatic reinits happenning
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below us. Got rid of unneeded headers. Use new opieatob8()
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return value convention. Added -f flag. Added SHA support.
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Modified by cmetz for OPIE 2.22. Finally got rid of the lock
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filename kluge by implementing refcounts for locks.
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Use opiepasswd() to update key file. Error if we can't
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write to the key file. Check for minimum seed length.
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Modified at NRL for OPIE 2.2. Changed opiestrip_crlf to
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opiestripcrlf. Check opiereadpass() return value.
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Minor optimization. Change calls to opiereadpass() to
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use echo arg. Use opiereadpass() where we can.
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Make everything static. Ifdef around some headers.
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Changed use of gethostname() to uname(). Got rid of
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the need for buf[]. Properly check return value of
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opieatob8. Check seed length. Always generate proper-
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length seeds.
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Modified at NRL for OPIE 2.1. Minor autoconf changes.
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Modified heavily 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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(skeyinit.c).
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*/
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#include "opie_cfg.h"
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#if HAVE_PWD_H
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#include <pwd.h>
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#endif /* HAVE_PWD_H */
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#include <stdio.h>
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#if HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#include <stdio.h>
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#include <sys/types.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#if HAVE_STDLIB_H
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#include <stdlib.h>
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#endif /* HAVE_STDLIB_H */
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#include "opie.h"
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#define MODE_DEFAULT 0
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#define MODE_CONSOLE 1
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#define MODE_DISABLE 2
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extern int optind;
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extern char *optarg;
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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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static VOIDRET usage FUNCTION((myname), char *myname)
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{
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fprintf(stderr, "usage: %s [-v] [-h] [-c|-d] [-f] [-n initial_sequence_number]\n [-s seed] [username]\n", myname);
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exit(1);
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}
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static VOIDRET finish FUNCTION((name), char *name)
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{
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struct opie opie;
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char buf[OPIE_RESPONSE_MAX + 1];
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if (name) {
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if (opiechallenge(&opie, name, buf)) {
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fprintf(stderr, "Error verifying database.\n");
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finish(NULL);
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}
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printf("\nID %s ", opie.opie_principal);
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if (opie.opie_val && (opie.opie_val[0] == '*')) {
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printf("is disabled.\n");
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finish(NULL);
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}
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printf("OTP key is %d %s\n", opie.opie_n, opie.opie_seed);
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{
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char key[8];
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if (!opieatob8(key, opie.opie_val)) {
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fprintf(stderr, "Error verifying key -- possible database corruption.\n");
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finish(NULL);
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}
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printf("%s\n", opiebtoe(buf, key));
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}
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}
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while(!opieunlock());
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exit(name ? 0 : 1);
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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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struct opie opie;
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int rval, n = 499, i, mode = MODE_DEFAULT, force = 0;
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char seed[OPIE_SEED_MAX+1];
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struct passwd *pp;
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memset(seed, 0, sizeof(seed));
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if (!(pp = getpwuid(getuid()))) {
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fprintf(stderr, "Who are you?");
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return 1;
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}
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while ((i = getopt(argc, argv, "fhvcn:s:d")) != EOF) {
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switch (i) {
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case 'v':
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opieversion();
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case 'f':
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#if INSECURE_OVERRIDE
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force = OPIEPASSWD_FORCE;
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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 'c':
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mode = MODE_CONSOLE;
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break;
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case 'd':
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mode = MODE_DISABLE;
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break;
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case 'n':
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i = atoi(optarg);
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if (!(i > 0 && i < 10000)) {
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printf("Sequence numbers must be > 0 and < 10000\n");
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finish(NULL);
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}
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n = i;
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break;
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case 's':
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i = strlen(optarg);
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if ((i > OPIE_SEED_MAX) || (i < OPIE_SEED_MIN)) {
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printf("Seeds must be between %d and %d characters long.\n",
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OPIE_SEED_MIN, OPIE_SEED_MAX);
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finish(NULL);
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}
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strncpy(seed, optarg, sizeof(seed));
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seed[sizeof(seed) - 1] = 0;
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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 >= 1) {
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if (strcmp(argv[optind], pp->pw_name)) {
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if (getuid()) {
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printf("Only root can change others' passwords.\n");
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exit(1);
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}
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if ((pp = getpwnam(argv[optind])) == NULL) {
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printf("%s: user unknown.\n", argv[optind]);
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exit(1);
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}
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}
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}
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opielock(pp->pw_name);
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rval = opielookup(&opie, pp->pw_name);
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switch (rval) {
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case 0:
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printf("Updating %s:\n", pp->pw_name);
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break;
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case 1:
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printf("Adding %s:\n", pp->pw_name);
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break;
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case 2:
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fprintf(stderr, "Error: Can't update key database.\n");
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finish(NULL);
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default:
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fprintf(stderr, "Error reading key database\n");
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finish(NULL);
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}
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if (seed[0]) {
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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.", OPIE_SEED_MAX);
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finish(NULL);
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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.", OPIE_SEED_MIN);
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finish(NULL);
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}
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} else {
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if (!rval)
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strcpy(seed, opie.opie_seed);
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if (opienewseed(seed) < 0) {
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fprintf(stderr, "Error updating seed.\n");
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finish(NULL);
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}
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}
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if (opie.opie_seed && opie.opie_seed[0] && !strcmp(opie.opie_seed, seed)) {
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fprintf(stderr, "You must use a different seed for the new OTP sequence.\n");
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finish(NULL);
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}
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switch(mode) {
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case MODE_DEFAULT:
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{
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char tmp[OPIE_RESPONSE_MAX + 2];
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printf("You need the response from an OTP generator.\n");
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#if DEBUG
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if (!rval) {
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#else /* DEBUG */
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if (!rval && getuid()) {
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#endif /* DEBUG */
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char oseed[OPIE_SEED_MAX + 1];
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int on;
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if (opiechallenge(&opie, pp->pw_name, tmp)) {
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fprintf(stderr, "Error issuing challenge.\n");
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finish(NULL);
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}
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on = opiegetsequence(&opie);
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{
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char *c;
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if (c = strrchr(tmp, ' '))
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strncpy(oseed, c + 1, sizeof(oseed));
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else {
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#if DEBUG
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fprintf(stderr, "opiepasswd: bogus challenge\n");
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#endif /* DEBUG */
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finish(NULL);
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}
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}
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printf("Old secret pass phrase:\n\t%s\n\tResponse: ", tmp);
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if (!opiereadpass(tmp, sizeof(tmp), 1))
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tmp[0] = 0;
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i = opieverify(&opie, tmp);
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if (!tmp[0]) {
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fprintf(stderr, "Error reading response.\n");
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finish(NULL);
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}
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if (i) {
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fprintf(stderr, "Error verifying response.\n");
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#if DEBUG
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fprintf(stderr, "opiepasswd: opieverify() returned %d\n", i);
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#endif /* DEBUG */
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finish(NULL);
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}
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{
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char nseed[OPIE_SEED_MAX + 1];
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int nn;
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if (opiechallenge(&opie, pp->pw_name, tmp)) {
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fprintf(stderr, "Error verifying database.\n");
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finish(NULL);
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}
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nn = opiegetsequence(&opie);
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{
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char *c;
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if (c = strrchr(tmp, ' '))
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strncpy(nseed, c + 1, sizeof(nseed));
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else {
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#if DEBUG
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fprintf(stderr, "opiepasswd: bogus challenge\n");
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#endif /* DEBUG */
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finish(NULL);
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}
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}
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opieverify(&opie, "");
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nn++;
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if ((nn != on) || strcmp(oseed, nseed))
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finish(pp->pw_name);
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}
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}
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printf("New secret pass phrase:");
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for (i = 0;; i++) {
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if (i > 2)
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finish(NULL);
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printf("\n\totp-%s %d %s\n\tResponse: ", algids[MDX], n, seed);
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if (!opiereadpass(tmp, sizeof(tmp), 1)) {
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fprintf(stderr, "Error reading response.\n");
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finish(NULL);
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}
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if (tmp[0] == '?') {
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printf("Enter the response from your OTP calculator: \n");
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continue;
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}
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if (tmp[0] == '\0') {
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fprintf(stderr, "Secret pass phrase unchanged.\n");
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finish(NULL);
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}
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if (!(rval = opiepasswd(&opie, force, pp->pw_name, n, seed, tmp)))
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finish(pp->pw_name);
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if (rval < 0) {
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fprintf(stderr, "Error updating key database.\n");
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finish(NULL);
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}
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printf("\tThat is not a valid OTP response.\n");
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}
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}
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break;
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case MODE_CONSOLE:
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{
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char passwd[OPIE_SECRET_MAX + 1], passwd2[OPIE_SECRET_MAX + 1];
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/* Get user's secret password */
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fprintf(stderr, "Only use this method from the console; NEVER from remote. If you are using\n");
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fprintf(stderr, "telnet, xterm, or a dial-in, type ^C now or exit with no password.\n");
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fprintf(stderr, "Then run opiepasswd without the -c parameter.\n");
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if (opieinsecure() && !force) {
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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 (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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finish(NULL);
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};
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printf("Using %s to compute responses.\n", algnames[MDX]);
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if (!rval && getuid()) {
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printf("Enter old secret pass phrase: ");
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if (!opiereadpass(passwd, sizeof(passwd), 0)) {
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fprintf(stderr, "Error reading secret pass phrase!\n");
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finish(NULL);
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}
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if (!passwd[0]) {
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fprintf(stderr, "Secret pass phrase unchanged.\n");
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finish(NULL);
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}
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{
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char key[8];
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char tbuf[OPIE_RESPONSE_MAX + 1];
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if (opiekeycrunch(MDX, key, opie.opie_seed, passwd) != 0) {
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fprintf(stderr, "%s: key crunch failed. Secret pass phrase unchanged\n", argv[0]);
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finish(NULL);
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}
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memset(passwd, 0, sizeof(passwd));
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i = opie.opie_n - 1;
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while (i-- != 0)
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opiehash(key, MDX);
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opiebtoe(tbuf, key);
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if (opieverify(&opie, tbuf)) {
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fprintf(stderr, "Sorry.\n");
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finish(NULL);
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}
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}
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}
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for (i = 0;; i++) {
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if (i > 2)
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finish(NULL);
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printf("Enter new secret pass phrase: ");
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if (!opiereadpass(passwd, sizeof(passwd), 0)) {
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fprintf(stderr, "Error reading secret pass phrase.\n");
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finish(NULL);
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}
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if (!passwd[0] || feof(stdin)) {
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fprintf(stderr, "Secret pass phrase unchanged.\n");
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finish(NULL);
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}
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if (opiepasscheck(passwd)) {
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memset(passwd, 0, sizeof(passwd));
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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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continue;
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}
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printf("Again new secret pass phrase: ");
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if (!opiereadpass(passwd2, sizeof(passwd2), 0)) {
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fprintf(stderr, "Error reading secret pass phrase.\n");
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finish(NULL);
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}
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if (feof(stdin)) {
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fprintf(stderr, "Secret pass phrase unchanged.\n");
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finish(NULL);
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}
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if (!passwd[0] || !strcmp(passwd, passwd2))
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break;
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fprintf(stderr, "Sorry, no match.\n");
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}
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memset(passwd2, 0, sizeof(passwd2));
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if (opiepasswd(&opie, 1 | force, pp->pw_name, n, seed, passwd)) {
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fprintf(stderr, "Error updating key database.\n");
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finish(NULL);
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}
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finish(pp->pw_name);
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}
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case MODE_DISABLE:
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{
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char tmp[4];
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int i;
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for (i = 0;; i++) {
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if (i > 2)
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finish(NULL);
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printf("Disable %s's OTP access? (yes or no) ", pp->pw_name);
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if (!opiereadpass(tmp, sizeof(tmp), 1)) {
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fprintf(stderr, "Error reading entry.\n");
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finish(NULL);
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}
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if (!strcmp(tmp, "no"))
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finish(NULL);
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if (!strcmp(tmp, "yes")) {
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if (opiepasswd(&opie, 0, pp->pw_name, n, seed, NULL)) {
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fprintf(stderr, "Error updating key database.\n");
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finish(NULL);
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}
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finish(pp->pw_name);
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}
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}
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}
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}
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}
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