telnetd/libtelnet/read_password.c

150 lines
4.3 KiB
C
Raw Normal View History

/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)read_password.c 8.3 (Berkeley) 5/30/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
/*
* $Source: /mit/kerberos/src/lib/des/RCS/read_password.c,v $
* $Author: jon $
*
* 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.
*/
#if defined(RSA_ENCPWD) || defined(KRB4_ENCPWD)
#include <stdio.h>
#include <strings.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <setjmp.h>
static jmp_buf env;
/*** Routines ****************************************************** */
/*
* This version just returns the string, doesn't map to key.
*
* Returns 0 on success, non-zero on failure.
*/
int
local_des_read_pw_string(s,max,prompt,verify)
char *s;
int max;
char *prompt;
int verify;
{
int ok = 0;
char *ptr;
jmp_buf old_env;
struct sgttyb tty_state;
char key_string[BUFSIZ];
if (max > BUFSIZ) {
return -1;
}
/* XXX assume jmp_buf is typedef'ed to an array */
memmove((char *)env, (char *)old_env, sizeof(env));
if (setjmp(env))
goto lose;
/* save terminal state*/
if (ioctl(0,TIOCGETP,(char *)&tty_state) == -1)
return -1;
/*
push_signals();
*/
/* Turn off echo */
tty_state.sg_flags &= ~ECHO;
if (ioctl(0,TIOCSETP,(char *)&tty_state) == -1)
return -1;
while (!ok) {
(void) printf("%s", prompt);
(void) fflush(stdout);
while (!fgets(s, max, stdin));
if ((ptr = strchr(s, '\n')))
*ptr = '\0';
if (verify) {
printf("\nVerifying, please re-enter %s",prompt);
(void) fflush(stdout);
if (!fgets(key_string, sizeof(key_string), stdin)) {
clearerr(stdin);
continue;
}
if ((ptr = strchr(key_string, '\n')))
*ptr = '\0';
if (strcmp(s,key_string)) {
printf("\n\07\07Mismatch - try again\n");
(void) fflush(stdout);
continue;
}
}
ok = 1;
}
lose:
if (!ok)
memset(s, 0, max);
printf("\n");
/* turn echo back on */
tty_state.sg_flags |= ECHO;
if (ioctl(0,TIOCSETP,(char *)&tty_state))
ok = 0;
/*
pop_signals();
*/
memmove((char *)old_env, (char *)env, sizeof(env));
if (verify)
memset(key_string, 0, sizeof (key_string));
s[max-1] = 0; /* force termination */
return !ok; /* return nonzero if not okay */
}
#endif /* defined(RSA_ENCPWD) || defined(KRB4_ENCPWD) */