examples/auth/crackcheck/crackcheck.c

   1 #include <memory.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <ctype.h>
   6 #include <crack.h>
   7 #include <unistd.h>
   8
   9 void usage(char *command) {
  10         char *c, *comm;
  11
  12         comm = command;
  13         while ((c = strrchr(comm, '/')) != NULL) {
  14                 comm = c + 1;
  15         }
  16
  17         fprintf(stderr, "Usage: %s [-c] [-s] [-d <dictionary>]\n\n", comm);
  18         fprintf(stderr, "     -c    enables NT like complexity checks\n");
  19         fprintf(stderr, "     -d <dictionary file>    for cracklib\n");
  20         fprintf(stderr, "     -s    simple check use NT like checks ONLY\n\n");
  21         fprintf(stderr, "The password is read via stdin.\n\n");
  22         exit(-1);
  23 }
  24
  25 int complexity(char* passwd)
  26 {
  27         /* TG 26.10.2005
  28          * check password for complexity like MS Windows NT
  29          */
  30
  31         int c_upper = 0;
  32         int c_lower = 0;
  33         int c_digit = 0;
  34         int c_punct = 0;
  35         int c_tot = 0;
  36         int i, len;
  37
  38         if (!passwd) goto fail;
  39         len = strlen(passwd);
  40
  41         for (i = 0; i < len; i++) {
  42
  43                 if (c_tot >= 3) break;
  44
  45                 if (isupper(passwd[i])) {
  46                         if (!c_upper) {
  47                                 c_upper = 1;
  48                                 c_tot += 1;
  49                         }
  50                         continue;
  51                 }
  52                 if (islower(passwd[i])) {
  53                         if (!c_lower) {
  54                                 c_lower = 1;
  55                                 c_tot += 1;
  56                         }
  57                         continue;
  58                 }
  59                 if (isdigit(passwd[i])) {
  60                         if (!c_digit) {
  61                                 c_digit = 1;
  62                                 c_tot += 1;
  63                         }
  64                         continue;
  65                 }
  66                 if (ispunct(passwd[i])) {
  67                         if (!c_punct) {
  68                                 c_punct = 1;
  69                                 c_tot += 1;
  70                         }
  71                         continue;
  72                 }
  73         }
  74
  75         if ((c_tot) < 3) goto fail;
  76         return 0;
  77
  78 fail:
  79         fprintf(stderr, "ERR Complexity check failed\n\n");
  80         return -4;
  81 }
  82
  83 int main(int argc, char **argv) {
  84         extern char *optarg;
  85         int c, ret, complex_check = 0, simplex_check = 0;
  86
  87         char f[256];
  88         char *dictionary = NULL;
  89         char *password;
  90         const char *reply;
  91
  92         while ( (c = getopt(argc, argv, "d:cs")) != EOF){
  93                 switch(c) {
  94                 case 'd':
  95                         dictionary = strdup(optarg);
  96                         break;
  97                 case 'c':
  98                         complex_check = 1;
  99                         break;
 100                 case 's':
 101                         complex_check = 1;
 102                         simplex_check = 1;
 103                         break;
 104                 default:
 105                         usage(argv[0]);
 106                 }
 107         }
 108
 109         if (!simplex_check && dictionary == NULL) {
 110                 fprintf(stderr, "ERR - Missing cracklib dictionary\n\n");
 111                 usage(argv[0]);
 112         }
 113
 114         fflush(stdin);
 115         password = fgets(f, sizeof(f), stdin);
 116
 117         if (password == NULL) {
 118                 fprintf(stderr, "ERR - Failed to read password\n\n");
 119                 exit(-2);
 120         }
 121
 122         if (complex_check) {
 123                 ret = complexity(password);
 124                 if (ret) {
 125                         exit(ret);
 126                 }
 127         }
 128
 129         if (simplex_check) {
 130                 exit(0);
 131         }
 132
 133         reply = FascistCheck(password, dictionary);
 134         if (reply != NULL) {
 135                 fprintf(stderr, "ERR - %s\n\n", reply);
 136                 exit(-3);
 137         }
 138
 139         exit(0);
 140 }
 141