usr.bin/key/skey.c

   1 /* Stand-alone program for computing responses to S/Key challenges.
   2  * Takes the iteration count and seed as command line args, prompts
   3  * for the user's key, and produces both word and hex format responses.
   4  *
   5  * Usage example:
   6  *      >skey 88 ka9q2
   7  *      Enter password:
   8  *      OMEN US HORN OMIT BACK AHOY
   9  *      C848 666B 6435 0A93
  10  *      >
  11  */
  12
  13 #ifndef lint
  14 static const char rcsid[] =
  15   "$FreeBSD: src/usr.bin/key/skey.c,v 1.6.6.1 2001/03/04 08:35:48 kris Exp $";
  16 #endif /* not lint */
  17
  18 #include <err.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23
  24 #ifdef  __MSDOS__
  25 #include <dos.h>
  26 #else   /* Assume BSD Unix */
  27 #include <fcntl.h>
  28 #endif
  29
  30 #include <skey.h>
  31
  32 static void usage __P((void));
  33
  34 int
  35 main(argc,argv)
  36 int argc;
  37 char *argv[];
  38 {
  39         int n,cnt,i;
  40         char passwd[256] /* ,passwd2[256] */;
  41         char key[8];
  42         char *seed;
  43         char buf[33];
  44         char *slash;
  45
  46         cnt = 1;
  47         while((i = getopt(argc,argv,"n:")) != -1){
  48                 switch(i){
  49                 case 'n':
  50                         cnt = atoi(optarg);
  51                         break;
  52                 }
  53         }
  54         /* could be in the form <number>/<seed> */
  55         if(argc <= optind + 1){
  56                 /*look for / in it */
  57                 if(argc <= optind)
  58                         usage();
  59
  60                 slash = strchr(argv[optind], '/');
  61                 if(slash == NULL)
  62                         usage();
  63                 *slash++ = '\0';
  64                 seed = slash;
  65
  66                 if((n = atoi(argv[optind])) < 0){
  67                         warnx("%s not positive",argv[optind]);
  68                         usage();
  69                 }
  70         }
  71         else {
  72
  73                 if((n = atoi(argv[optind])) < 0){
  74                         warnx("%s not positive",argv[optind]);
  75                         usage();
  76                 }
  77                 seed = argv[++optind];
  78         }
  79         fprintf(stderr,"Reminder - Do not use this program while logged in via telnet or rlogin.\n");
  80
  81         /* Get user's secret password */
  82         for(;;){
  83                 fprintf(stderr,"Enter secret password: ");
  84                 readpass(passwd,sizeof(passwd));
  85                 break;
  86         /************
  87                 fprintf(stderr,"Again secret password: ");
  88                 readpass(passwd2,sizeof(passwd));
  89                 if(strcmp(passwd,passwd2) == 0) break;
  90                 fprintf(stderr, "Sorry no match\n");
  91         **************/
  92
  93         }
  94
  95         /* Crunch seed and password into starting key */
  96         if(keycrunch(key,seed,passwd) != 0)
  97                 errx(1, "key crunch failed");
  98         if(cnt == 1){
  99                 while(n-- != 0)
 100                         f(key);
 101                 printf("%s\n",btoe(buf,key));
 102 #ifdef  HEXIN
 103                 printf("%s\n",put8(buf,key));
 104 #endif
 105         } else {
 106                 for(i=0;i<=n-cnt;i++)
 107                         f(key);
 108                 for(;i<=n;i++){
 109 #ifdef  HEXIN
 110                         printf("%d: %-29s  %s\n",i,btoe(buf,key),put8(buf,key));
 111 #else
 112                         printf("%d: %-29s\n",i,btoe(buf,key));
 113 #endif
 114                         f(key);
 115                 }
 116         }
 117         return 0;
 118 }
 119
 120 static void
 121 usage()
 122 {
 123         fprintf(stderr,"usage: key [-n count] <sequence #>[/] <key>\n");
 124         exit(1);
 125 }