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  * $FreeBSD: src/usr.bin/key/skey.c,v 1.6.6.1 2001/03/04 08:35:48 kris Exp $
  13  * $DragonFly: src/usr.bin/key/skey.c,v 1.2 2003/06/17 04:29:27 dillon Exp $
  14  */
  15
  16 #include <err.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21
  22 #ifdef  __MSDOS__
  23 #include <dos.h>
  24 #else   /* Assume BSD Unix */
  25 #include <fcntl.h>
  26 #endif
  27
  28 #include <skey.h>
  29
  30 static void usage __P((void));
  31
  32 int
  33 main(argc,argv)
  34 int argc;
  35 char *argv[];
  36 {
  37         int n,cnt,i;
  38         char passwd[256] /* ,passwd2[256] */;
  39         char key[8];
  40         char *seed;
  41         char buf[33];
  42         char *slash;
  43
  44         cnt = 1;
  45         while((i = getopt(argc,argv,"n:")) != -1){
  46                 switch(i){
  47                 case 'n':
  48                         cnt = atoi(optarg);
  49                         break;
  50                 }
  51         }
  52         /* could be in the form <number>/<seed> */
  53         if(argc <= optind + 1){
  54                 /*look for / in it */
  55                 if(argc <= optind)
  56                         usage();
  57
  58                 slash = strchr(argv[optind], '/');
  59                 if(slash == NULL)
  60                         usage();
  61                 *slash++ = '\0';
  62                 seed = slash;
  63
  64                 if((n = atoi(argv[optind])) < 0){
  65                         warnx("%s not positive",argv[optind]);
  66                         usage();
  67                 }
  68         }
  69         else {
  70
  71                 if((n = atoi(argv[optind])) < 0){
  72                         warnx("%s not positive",argv[optind]);
  73                         usage();
  74                 }
  75                 seed = argv[++optind];
  76         }
  77         fprintf(stderr,"Reminder - Do not use this program while logged in via telnet or rlogin.\n");
  78
  79         /* Get user's secret password */
  80         for(;;){
  81                 fprintf(stderr,"Enter secret password: ");
  82                 readpass(passwd,sizeof(passwd));
  83                 break;
  84         /************
  85                 fprintf(stderr,"Again secret password: ");
  86                 readpass(passwd2,sizeof(passwd));
  87                 if(strcmp(passwd,passwd2) == 0) break;
  88                 fprintf(stderr, "Sorry no match\n");
  89         **************/
  90
  91         }
  92
  93         /* Crunch seed and password into starting key */
  94         if(keycrunch(key,seed,passwd) != 0)
  95                 errx(1, "key crunch failed");
  96         if(cnt == 1){
  97                 while(n-- != 0)
  98                         f(key);
  99                 printf("%s\n",btoe(buf,key));
 100 #ifdef  HEXIN
 101                 printf("%s\n",put8(buf,key));
 102 #endif
 103         } else {
 104                 for(i=0;i<=n-cnt;i++)
 105                         f(key);
 106                 for(;i<=n;i++){
 107 #ifdef  HEXIN
 108                         printf("%d: %-29s  %s\n",i,btoe(buf,key),put8(buf,key));
 109 #else
 110                         printf("%d: %-29s\n",i,btoe(buf,key));
 111 #endif
 112                         f(key);
 113                 }
 114         }
 115         return 0;
 116 }
 117
 118 static void
 119 usage()
 120 {
 121         fprintf(stderr,"usage: key [-n count] <sequence #>[/] <key>\n");
 122         exit(1);
 123 }