cac.c

   1 /* cac.c - crypt and compare
   2  *
   3  * author: hackbard
   4  *
   5  */
   6
   7 #include <stdio.h>
   8 #include <crypt.h>
   9 #include <string.h>
  10
  11 int main(int argc, char *argv[]) {
  12
  13         FILE *shadow_h, *passwd_h;
  14         char temp[256];
  15         char temp2[30];
  16
  17         if(argc!=3) {
  18                 printf("usage: %s <shadow-file> <password-file>\n",argv[0]);
  19                 return 0;
  20         }
  21
  22         shadow_h=fopen(argv[1],"r");
  23         if(shadow_h==NULL) {
  24                 printf("error: cant open %s for reading\n",argv[1]);
  25                 return 0;
  26         } else {
  27                 printf("reading %s\n",argv[1]);
  28         }
  29         passwd_h=fopen(argv[2],"r");
  30         if(passwd_h==NULL) {
  31                 printf("error: cant open %s for reading\n",argv[2]);
  32                 return 0;
  33         } else {
  34                 printf("using %s as passwd library\n",argv[2]);
  35         }
  36
  37         while(fgets(temp,256,shadow_h)) {
  38                 if(strstr(temp,"root")) {
  39                         /* none md5 way ... */
  40                         if(temp[4]==':') {
  41                         while(fgets(temp2,30,passwd_h)) {
  42                         int mylen=strlen(temp2);
  43                         if((mylen>=1) && (temp2[mylen-1]=='\n')) {
  44                                 if((mylen>=2) && (temp2[mylen-2]==0x0d)) {
  45                                         mylen-=2;
  46                                         temp2[mylen]=0;
  47                                         printf("dosfile!\n");
  48                                 }
  49                                 else
  50                                         temp2[--mylen]=0;
  51                         }
  52                         if(mylen>=1) {
  53                         if(strncmp(crypt(temp2,(temp+5)),(temp+5),13)==0) {
  54                                 printf("succes: %s\n",argv[2]);
  55                                 return 0;
  56                         }
  57                         }
  58                         }
  59                         }
  60                 }
  61         }
  62         return 0;
  63 }