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387 lines
8.5 KiB
C
387 lines
8.5 KiB
C
/* opieauto.c: The opieauto program.
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%%% copyright-cmetz-96
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This software is Copyright 1996-2001 by Craig Metz, All Rights Reserved.
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The Inner Net License Version 3 applies to this 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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History:
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Created by cmetz for OPIE 2.4 based on previously released
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test code. Use opiestrncpy().
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*/
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#include "opie_cfg.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#if HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif /* HAVE_SYS_TIME_H */
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#include <stdio.h>
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#include <errno.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 <getopt.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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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <sys/stat.h>
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#include "opie.h"
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#ifndef max
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#define max(x, y) (((x) > (y)) ? (x) : (y))
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#endif /* max */
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int window = 10;
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char *myname = NULL;
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uid_t myuid = 0;
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#define MAXCLIENTS 2
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int parents, s[MAXCLIENTS + 1];
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char cmd[1+1+1+1+4+1+OPIE_SEED_MAX+1+4+1+4+1+4+1+4+1];
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struct cachedotp {
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struct cachedotp *next;
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int algorithm, base, current;
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struct opie_otpkey basekey;
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char seed[OPIE_SEED_MAX+1];
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};
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struct cachedotp *head = NULL;
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char *algids[] = { NULL, NULL, NULL, "sha1", "md4", "md5" };
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void baile(x) {
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fprintf(stderr, "%s: %s: %s(%d)\n", myname, x, strerror(errno), errno);
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exit(1);
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}
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void bail(x) {
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fprintf(stderr, "%s: %s\n", myname, x);
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exit(1);
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}
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void zerocache(void)
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{
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struct cachedotp *c = head, *c2;
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while(c) {
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c2 = c->next;
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memset(c, 0, sizeof(struct cachedotp));
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c = c2;
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};
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};
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int doreq(int fd)
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{
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int algorithm, sequence, i;
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char *seed = NULL, *response = NULL;
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if (((cmd[0] != 'S') && (cmd[0] != 's')) || (cmd[1] != '=') || (cmd[2] != ' ')) {
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#if DEBUG
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fprintf(stderr, "%s: got bogus command: %s\n", myname, cmd);
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#endif /* DEBUG */
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goto error;
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};
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{
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char *c;
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if (((algorithm = strtoul(&cmd[3], &c, 10)) < 3) || (algorithm > 5) || (*c != ' ')) {
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#if DEBUG
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fprintf(stderr, "%s: got bogus algorithm: %s\n", myname, cmd);
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#endif /* DEBUG */
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goto error;
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};
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if (((sequence = strtoul(c + 1, &c, 10)) <= OPIE_SEQUENCE_RESTRICT) || (sequence > OPIE_SEQUENCE_MAX)) {
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#if DEBUG
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fprintf(stderr, "%s: got bogus sequence: %s\n", myname, cmd);
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#endif /* DEBUG */
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goto error;
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};
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if (cmd[0] == 'S') {
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if (!(c = strchr(seed = c + 1, ' '))) {
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#if DEBUG
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fprintf(stderr, "%s: got bogus seed: %s\n", myname, cmd);
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#endif /* DEBUG */
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goto error;
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};
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*c = 0;
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if (!(c = strchr(response = c + 1, '\n'))) {
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#if DEBUG
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fprintf(stderr, "%s: got bogus response: %s\n", myname, cmd);
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#endif /* DEBUG */
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goto error;
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};
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*c = 0;
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} else {
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if (!(c = strchr(seed = c + 1, '\n'))) {
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#if DEBUG
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fprintf(stderr, "%s: got bogus seed: %s\n", myname, cmd);
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#endif /* DEBUG */
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goto error;
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};
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*c = 0;
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};
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};
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#if DEBUG
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fprintf(stderr, "got cmd=%c, algorithm=%d sequence=%d seed=+%s+ response=+%s+ on fd %d\n", cmd[0], algorithm, sequence, seed, response, fd);
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#endif /* DEBUG */
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seed = strdup(seed);
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if (sequence < 10) {
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#if DEBUG
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fprintf(stderr, "sequence < 10; can't do it\n");
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#endif /* DEBUG */
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sprintf(cmd, "%c- %d %d %s\n", cmd[0], algorithm, sequence, seed);
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};
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{
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struct cachedotp **c;
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for (c = &head; *c && (strcmp((*c)->seed, seed) || ((*c)->algorithm != algorithm)); c = &((*c)->next));
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if (!(*c)) {
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if (cmd[0] == 's') {
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#if DEBUG
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fprintf(stderr, "(seed, algorithm) not found for s command\n");
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#endif /* DEBUG */
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sprintf(cmd, "s- %d %d %s\n", algorithm, sequence, seed);
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goto out;
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}
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if (!(*c = malloc(sizeof(struct cachedotp))))
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baile("malloc");
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memset(*c, 0, sizeof(struct cachedotp));
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(*c)->algorithm = algorithm;
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opiestrncpy((*c)->seed, seed, OPIE_SEED_MAX);
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};
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if (cmd[0] == 'S') {
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(*c)->base = max(sequence - window + 1, OPIE_SEQUENCE_RESTRICT);
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(*c)->current = sequence;
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if (!opieatob8(&(*c)->basekey, response))
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goto error;
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sprintf(cmd, "S+ %d %d %s\n", algorithm, sequence, (*c)->seed);
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} else {
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if (sequence != ((*c)->current - 1)) {
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#if DEBUG
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fprintf(stderr, "out of sequence: sequence=%d, base=%d, current=%d\n", sequence, (*c)->base, (*c)->current);
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#endif /* DEBUG */
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sprintf(cmd, "s- %d %d %s\n", algorithm, sequence, (*c)->seed);
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goto out;
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};
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if (sequence < (*c)->base) {
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#if DEBUG
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fprintf(stderr, "attempt to generate below base: sequence=%d, base=%d, current=%d\n", sequence, (*c)->base, (*c)->current);
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#endif /* DEBUG */
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sprintf(cmd, "s- %d %d %s\n", algorithm, sequence, (*c)->seed);
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goto out;
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};
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(*c)->current = sequence;
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i = sequence - (*c)->base;
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{
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struct opie_otpkey key;
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char buffer[16+1];
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key = (*c)->basekey;
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while(i--)
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opiehash(&key, algorithm);
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opiebtoa8(buffer, &key);
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sprintf(cmd, "s+ %d %d %s %s\n", algorithm, sequence, (*c)->seed, buffer);
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};
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};
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printf("%c otp-%s %d %s (%d/%d)\n", cmd[0], algids[algorithm], sequence, (*c)->seed, sequence - (*c)->base, window);
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fflush(stdout);
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if (sequence == (*c)->base) {
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struct cachedotp *c2 = *c;
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*c = (*c)->next;
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memset(c2, 0, sizeof(struct cachedotp));
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free(c2);
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};
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};
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out:
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write(fd, cmd, i = strlen(cmd));
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free(seed);
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return 0;
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error:
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fprintf(stderr, "Invalid command on fd %d\n", fd);
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if (seed)
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free(seed);
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return -1;
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}
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static void usage()
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{
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fprintf(stderr, "usage: %s [-v] [-h] [-q] [-n <number of OTPs>]\n", myname);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int i;
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struct stat st;
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char *sockpath;
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if (myname = strrchr(argv[0], '/'))
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myname++;
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else
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myname = argv[0];
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while((i = getopt(argc, argv, "w:hv")) != EOF) {
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switch(i) {
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case 'v':
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opieversion();
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case 'w':
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if (!(window = atoi(optarg))) {
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fprintf(stderr, "%s: invalid number of OTPs: %s\n", myname, optarg);
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exit(1);
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};
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break;
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default:
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usage();
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}
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};
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{
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uid_t myeuid;
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if (!(myuid = getuid()) || !(myeuid = geteuid()) || (myuid != myeuid))
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bail("this program must not be run with superuser priveleges or setuid.");
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};
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if (atexit(zerocache) < 0)
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baile("atexit");
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{
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struct sockaddr_un sun;
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memset(&sun, 0, sizeof(struct sockaddr_un));
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sun.sun_family = AF_UNIX;
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{
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char *c;
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char *c2 = "/.opieauto";
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if (!(c = getenv("HOME")))
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bail("getenv(HOME) failed -- no HOME variable?");
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if (strlen(c) > (sizeof(sun.sun_path) - strlen(c2) - 1))
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bail("your HOME is too long");
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strcpy(sun.sun_path, c);
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strcat(sun.sun_path, c2);
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sockpath = strdup(sun.sun_path);
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};
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if ((parents = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
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baile("socket");
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if (unlink(sockpath) && (errno != ENOENT))
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baile("unlink");
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if (umask(0177) < 0)
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baile("umask");
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if (bind(parents, (struct sockaddr *)&sun, sizeof(struct sockaddr_un)))
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baile("bind");
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if (stat(sockpath, &st) < 0)
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baile("stat");
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if ((st.st_uid != myuid) || (!S_ISSOCK(st.st_mode)) || ((st.st_mode & 07777) != 0600))
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bail("socket permissions and/or ownership were not correctly created.");
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if (listen(parents, 1) < 0)
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baile("listen");
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};
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{
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fd_set fds, rfds, efds;
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int maxfd = parents;
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int i, j;
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FD_ZERO(&fds);
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FD_SET(parents, &fds);
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while(1) {
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memcpy(&rfds, &fds, sizeof(fd_set));
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if (select(maxfd + 1, &rfds, NULL, NULL, NULL) < 0)
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baile("select");
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for (i = 0; s[i]; i++) {
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if (!FD_ISSET(s[i], &rfds))
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continue;
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if (((j = read(s[i], cmd, sizeof(cmd)-1)) <= 0) || ((cmd[j] = 0) || doreq(s[i]))) {
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close(s[i]);
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FD_CLR(s[i], &fds);
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if (s[i] == maxfd)
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maxfd--;
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for (j = i; s[j]; s[j] = s[j + 1], j++);
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FD_SET(parents, &fds);
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i--;
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continue;
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};
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};
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if (FD_ISSET(parents, &rfds)) {
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for (i = 0; s[i]; i++)
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if (i > MAXCLIENTS)
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bail("this message never printed");
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if (stat(sockpath, &st) < 0)
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baile("stat");
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if ((st.st_uid != myuid) || (!S_ISSOCK(st.st_mode)) || ((st.st_mode & 07777) != 0600))
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bail("socket permissions and/or ownership has been messed with.");
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if ((s[i] = accept(parents, NULL, 0)) < 0)
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baile("accept");
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FD_SET(s[i], &fds);
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if (s[i] > maxfd)
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maxfd = s[i];
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sprintf(cmd, "C+ %d\n", window);
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if (write(s[i], cmd, j = strlen(cmd)) != j)
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baile("write");
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if (++i == MAXCLIENTS)
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FD_CLR(parents, &fds);
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}
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}
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}
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}
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