auth_overflow2.c


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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int check_authentication(const char *password)
{
  char password_buffer[16];
  int auth_flag = 0;

  strcpy(password_buffer, password);

  if (strcmp(password_buffer, "brillig") == 0)
    auth_flag = 1;
  if (strcmp(password_buffer, "outgrabe") == 0)
    auth_flag = 1;

  return auth_flag;
}

int main(int argc, const char *argv[])
{
  if (argc < 2) {
    printf("Usage: %s <password>\n", argv[0]);
    exit(0);
  }
  if (check_authentication(argv[1])) {
    printf("\n-=-=-=-=-=-=-=-=-=-=-=\n");
    printf("         Access Granted.\n");
    printf("-=-=-=-=-=-=-=-=-=-=-=\n");
  } else {
    printf("\nAccess Denied.\n");
  }
  return 0;
}