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/*
* $Source$
* $Author$
*
* 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[] =
"$Id$";
#endif
#include <mit-copyright.h>
#include <des.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <setjmp.h>
#ifdef POSIX
#include <termios.h>
#else
#include <sys/ioctl.h>
#endif
#ifdef POSIX
typedef void sigtype;
static sigjmp_buf env;
#else
typedef int sigtype;
static jmp_buf env;
#endif
static sigtype sig_restore();
static push_signals(), pop_signals();
int des_read_pw_string();
/*** Routines ****************************************************** */
int
des_read_password(k,prompt,verify)
des_cblock *k;
char *prompt;
int verify;
{
int ok;
char key_string[BUFSIZ];
#ifdef POSIX
if (sigsetjmp(env, 1)) {
ok = -1;
goto lose;
}
#else
if (setjmp(env)) {
ok = -1;
goto lose;
}
#endif
ok = des_read_pw_string(key_string, BUFSIZ, prompt, verify);
if (ok == 0)
des_string_to_key(key_string, k);
lose:
memset(key_string, 0, 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;
{
int ok = 0;
char *ptr;
char key_string[BUFSIZ];
#ifdef POSIX
sigjmp_buf old_env;
struct termios tty_state;
#else
jmp_buf old_env;
struct sgttyb tty_state;
#endif
if (max > BUFSIZ) {
return -1;
}
#ifdef POSIX
/* save terminal state */
if (tcgetattr(0, &tty_state) == -1)
return -1;
/* Turn off echo */
tty_state.c_lflag &= ~ECHO;
if (tcsetattr(0, TCSANOW, &tty_state) == -1)
return -1;
memcpy((char *)env, (char *)old_env, sizeof(env));
if (sigsetjmp(env, 1))
goto lose;
#else
/* save terminal state*/
if (ioctl(0,TIOCGETP,(char *)&tty_state) == -1)
return -1;
/* Turn off echo */
tty_state.sg_flags &= ~ECHO;
if (ioctl(0,TIOCSETP,(char *)&tty_state) == -1)
return -1;
memcpy((char *)env, (char *)old_env, sizeof(env));
if (setjmp(env))
goto lose;
#endif
push_signals();
while (!ok) {
(void) printf(prompt);
(void) fflush(stdout);
#ifdef CROSSMSDOS
h19line(s,sizeof(s),0);
if (!strlen(s))
continue;
#else
if (!fgets(s, max, stdin)) {
clearerr(stdin);
continue;
}
if ((ptr = strchr(s, '\n')))
*ptr = '\0';
#endif
if (verify) {
printf("\nVerifying, please re-enter %s",prompt);
(void) fflush(stdout);
#ifdef CROSSMSDOS
h19line(key_string,sizeof(key_string),0);
if (!strlen(key_string))
continue;
#else
if (!fgets(key_string, sizeof(key_string), stdin)) {
clearerr(stdin);
continue;
}
if ((ptr = strchr(key_string, '\n')))
*ptr = '\0';
#endif
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");
#ifdef POSIX
/* turn echo back on */
tty_state.c_lflag |= ECHO;
if (tcsetattr(0, TCSANOW, &tty_state))
ok = 0;
#else
/* turn echo back on */
tty_state.sg_flags |= ECHO;
if (ioctl(0,TIOCSETP,(char *)&tty_state))
ok = 0;
#endif
pop_signals();
memcpy((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 */
}
#ifdef POSIX
/* This can be static since we should never have more than one set saved... */
static struct sigaction osa[NSIG];
static push_signals()
{
register int i;
struct sigaction nsa;
sigemptyset(&nsa.sa_mask);
nsa.sa_flags = 0;
nsa.sa_handler = sig_restore;
for (i=0; i<NSIG; i++)
sigaction(i, &nsa, &osa[i]);
}
static pop_signals()
{
register int i;
for (i=0; i<NSIG; i++)
sigaction(i, &osa[i], (struct sigaction *)0);
}
static sigtype sig_restore()
{
siglongjmp(env, 1);
}
#else /* !POSIX */
/* This can be static since we should never have more than one set saved... */
static sigtype (*old_sigfunc[NSIG])();
static push_signals()
{
register int i;
for (i = 0; i < NSIG; i++)
old_sigfunc[i] = signal(i,sig_restore);
}
static pop_signals()
{
register int i;
for (i = 0; i < NSIG; i++)
(void) signal(i,old_sigfunc[i]);
}
static sigtype
sig_restore()
{
longjmp(env,1);
}
#endif /* POSIX */
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