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/*
* CU sudo version 1.6
* Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Please send bugs, changes, problems to sudo-bugs@courtesan.com
*
*******************************************************************
*
* This module contains tgetpass(), getpass(3) with a timeout.
* It should work on any OS that supports sgtty (4BSD), termio (SYSV),
* or termios (POSIX) line disciplines.
*
* Todd C. Miller Sun Jun 5 17:22:31 MDT 1994
*/
#include "config.h"
#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <limits.h>
#include <pwd.h>
#include <sys/param.h>
#include <sys/types.h>
#ifdef HAVE_SYS_BSDTYPES_H
#include <sys/bsdtypes.h>
#endif /* HAVE_SYS_BSDTYPES_H */
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#include <sys/time.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#else
#ifdef HAVE_TERMIO_H
#include <termio.h>
#else
#include <sgtty.h>
#include <sys/ioctl.h>
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
#include "sudo.h"
#ifndef TCSASOFT
#define TCSASOFT 0
#endif /* TCSASOFT */
#ifndef lint
static const char rcsid[] = "$Sudo$";
#endif /* lint */
/******************************************************************
*
* tgetpass()
*
* this function prints a prompt and gets a password from /dev/tty
* or stdin. Echo is turned off (if possible) during password entry
* and input will time out based on the value of timeout.
*/
char *
tgetpass(prompt, timeout)
const char *prompt;
int timeout;
{
#ifdef HAVE_TERMIOS_H
struct termios term;
#else
#ifdef HAVE_TERMIO_H
struct termio term;
#else
struct sgttyb ttyb;
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
#ifdef POSIX_SIGNALS
sigset_t oldmask;
sigset_t mask;
#else
int oldmask;
#endif /* POSIX_SIGNALS */
int n, echo, input, output;
static char buf[SUDO_PASS_MAX + 1];
fd_set *readfds;
struct timeval tv;
/*
* mask out SIGINT and SIGTSTP, should probably just catch and deal.
*/
#ifdef POSIX_SIGNALS
(void) sigemptyset(&mask);
(void) sigaddset(&mask, SIGINT);
(void) sigaddset(&mask, SIGTSTP);
(void) sigprocmask(SIG_BLOCK, &mask, &oldmask);
#else
oldmask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP));
#endif
/*
* open /dev/tty for reading/writing if possible or use
* stdin and stderr instead.
*/
if ((input = output = open(_PATH_TTY, O_RDWR)) == -1) {
input = STDIN_FILENO;
output = STDERR_FILENO;
}
/* print the prompt */
if (prompt)
(void) write(output, prompt, strlen(prompt) + 1);
/*
* turn off echo
*/
#ifdef HAVE_TERMIOS_H
(void) tcgetattr(input, &term);
if ((echo = (term.c_lflag & ECHO))) {
term.c_lflag &= ~ECHO;
(void) tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
}
#else
#ifdef HAVE_TERMIO_H
(void) ioctl(input, TCGETA, &term);
if ((echo = (term.c_lflag & ECHO))) {
term.c_lflag &= ~ECHO;
(void) ioctl(input, TCSETA, &term);
}
#else
(void) ioctl(input, TIOCGETP, &ttyb);
if ((echo = (ttyb.sg_flags & ECHO))) {
ttyb.sg_flags &= ~ECHO;
(void) ioctl(input, TIOCSETP, &ttyb);
}
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
/*
* Timeout of <= 0 means no timeout
*/
if (timeout > 0) {
/* setup for select(2) */
n = howmany(input + 1, NFDBITS) * sizeof(fd_mask);
readfds = (fd_set *) emalloc(n);
(void) memset((VOID *)readfds, 0, n);
FD_SET(input, readfds);
/* set timeout for select */
tv.tv_sec = timeout;
tv.tv_usec = 0;
/*
* get password or return empty string if nothing to read by timeout
*/
buf[0] = '\0';
while ((n = select(input + 1, readfds, 0, 0, &tv)) == -1 &&
errno == EINTR)
;
if (n != 0 && (n = read(input, buf, sizeof(buf) - 1)) > 0) {
if (buf[n - 1] == '\n')
n--;
buf[n] = '\0';
}
free(readfds);
} else {
buf[0] = '\0';
if ((n = read(input, buf, sizeof(buf) - 1)) > 0) {
if (buf[n - 1] == '\n')
n--;
buf[n] = '\0';
}
}
/* turn on echo */
#ifdef HAVE_TERMIOS_H
if (echo) {
term.c_lflag |= ECHO;
(void) tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
}
#else
#ifdef HAVE_TERMIO_H
if (echo) {
term.c_lflag |= ECHO;
(void) ioctl(input, TCSETA, &term);
}
#else
if (echo) {
ttyb.sg_flags |= ECHO;
(void) ioctl(input, TIOCSETP, &ttyb);
}
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
/* print a newline since echo is turned off */
(void) write(output, "\n", 1);
/* restore old signal mask */
#ifdef POSIX_SIGNALS
(void) sigprocmask(SIG_SETMASK, &oldmask, NULL);
#else
(void) sigsetmask(oldmask);
#endif
/* close /dev/tty if that's what we opened */
if (input != STDIN_FILENO)
(void) close(input);
return(buf);
}
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