BSD 4_4_Lite1 development

[unix-history] / usr / src / kerberosIV / des / read_password.c

/*
* $Source: /usr/src/kerberosIV/des/RCS/read_password.c,v $
* $Author: kfall $
*
* Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
* of Technology.
*
* For copying and distribution information, please see the file
* <mit-copyright.h>.
*
* This routine prints the supplied string to standard
* output as a prompt, and reads a password string without
* echoing.
*/

#ifndef lint
static char rcsid_read_password_c[] =
"$Header: /usr/src/kerberosIV/des/RCS/read_password.c,v 4.13 90/06/23 03:09:35 kfall Exp $";
#endif  lint

#include <sys/param.h>
#include <stdio.h>
#include <string.h>
#include <setjmp.h>
#include <pwd.h>
#include <mit-copyright.h>
#include <des.h>
#include "conf.h"

extern char     *getpass();

#ifdef  BSDUNIX
static jmp_buf env;
#endif

int
des_read_password(k, prompt, verify)
       des_cblock *k;
       char *prompt;
       int verify;
{
       int ok;
       char key_string[_PASSWORD_LEN];

#ifdef BSDUNIX
       if (setjmp(env)) {
               ok = -1;
               goto lose;
       }
#endif

       ok = des_read_pw_string(key_string, _PASSWORD_LEN, prompt, verify);
       if (ok == 0)
               des_string_to_key(key_string, k);

lose:
       bzero(key_string, sizeof (key_string));
       return ok;
}

/*
* This version just returns the string, doesn't map to key.
*
* Returns 0 on success, non-zero on failure.
*/

int
des_read_pw_string(s, max, prompt, verify)
       char *s;
       int max;
       char *prompt;
       int verify;
{
       register int len = MIN(_PASSWORD_LEN, max);
       char    *ptr = getpass(prompt);

       (void)strncpy(s, ptr, len);
       if (verify) {
               while (strncmp(getpass(prompt), s, len) != 0) {
                       printf("\n\07\07Mismatch - try again\n");
                       (void)fflush(stdout);
                       continue;
               }
       }
       s[len-1] = '\0';        /* just in case */
       return 0;
}