130 lines
2.4 KiB
C
130 lines
2.4 KiB
C
/* Stand-alone program for computing responses to S/Key challenges.
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* Takes the iteration count and seed as command line args, prompts
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* for the user's key, and produces both word and hex format responses.
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*
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* Usage example:
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* >skey 88 ka9q2
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* Enter password:
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* OMEN US HORN OMIT BACK AHOY
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* C848 666B 6435 0A93
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* >
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef __MSDOS__
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#include <dos.h>
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#else /* Assume BSD unix */
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#include <fcntl.h>
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#endif
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#include <skey.h>
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char *readpass();
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void usage();
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int getopt();
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extern int optind;
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extern char *optarg;
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int
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main(argc,argv)
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int argc;
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char *argv[];
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{
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int n,cnt,i;
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char passwd[256],passwd2[256];
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char key[8];
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char *seed;
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char buf[33];
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char *slash;
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cnt = 1;
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while((i = getopt(argc,argv,"n:")) != -1){
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switch(i){
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case 'n':
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cnt = atoi(optarg);
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break;
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}
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}
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/* could be in the form <number>/<seed> */
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if(argc <= optind + 1){
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/*look for / in it */
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if(argc <= optind){
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usage(argv[0]);
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return 1;
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}
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slash = strchr(argv[optind], '/');
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if(slash == NULL){
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usage(argv[0]);
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return 1;
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}
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*slash++ = '\0';
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seed = slash;
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if((n = atoi(argv[optind])) < 0){
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fprintf(stderr,"%s not positive\n",argv[optind]);
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usage(argv[0]);
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return 1;
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}
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}
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else {
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if((n = atoi(argv[optind])) < 0){
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fprintf(stderr,"%s not positive\n",argv[optind]);
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usage(argv[0]);
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return 1;
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}
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seed = argv[++optind];
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}
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fprintf(stderr,"Reminder - Do not use this program while logged in via telnet or rlogin.\n");
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/* Get user's secret password */
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for(;;){
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fprintf(stderr,"Enter secret password: ");
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readpass(passwd,sizeof(passwd));
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break;
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/************
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fprintf(stderr,"Again secret password: ");
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readpass(passwd2,sizeof(passwd));
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if(strcmp(passwd,passwd2) == 0) break;
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fprintf(stderr, "Sorry no match\n");
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**************/
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}
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/* Crunch seed and password into starting key */
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if(keycrunch(key,seed,passwd) != 0){
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fprintf(stderr,"%s: key crunch failed\n",argv[0]);
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return 1;
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}
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if(cnt == 1){
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while(n-- != 0)
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f(key);
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printf("%s\n",btoe(buf,key));
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#ifdef HEXIN
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printf("%s\n",put8(buf,key));
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#endif
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} else {
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for(i=0;i<=n-cnt;i++)
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f(key);
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for(;i<=n;i++){
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#ifdef HEXIN
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printf("%d: %-29s %s\n",i,btoe(buf,key),put8(buf,key));
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#else
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printf("%d: %-29s\n",i,btoe(buf,key));
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#endif
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f(key);
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}
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}
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return 0;
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}
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void
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usage(s)
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char *s;
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{
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fprintf(stderr,"Usage: %s [-n count] <sequence #>[/] <key> \n",s);
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}
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