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/*
* Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#ifdef __TANDEM
# include <floss.h>
#endif
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#ifdef HAVE_SYS_BSDTYPES_H
# include <sys/bsdtypes.h>
#endif /* HAVE_SYS_BSDTYPES_H */
#include <sys/time.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
# include <memory.h>
# endif
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.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 lint
__unused static const char rcsid[] = "$Sudo: tgetpass.c,v 1.111.2.6 2008/01/16 18:03:24 millert Exp $";
#endif /* lint */
#ifndef TCSASOFT
# define TCSASOFT 0
#endif
#ifndef ECHONL
# define ECHONL 0
#endif
#ifndef _POSIX_VDISABLE
# ifdef VDISABLE
# define _POSIX_VDISABLE VDISABLE
# else
# define _POSIX_VDISABLE 0
# endif
#endif
/*
* QNX 6 (at least) has issues with TCSAFLUSH.
*/
#ifdef __QNX__
#undef TCSAFLUSH
#define TCSAFLUSH TCSADRAIN
#endif
/*
* Compat macros for non-termios systems.
*/
#ifndef HAVE_TERMIOS_H
# ifdef HAVE_TERMIO_H
# undef termios
# define termios termio
# define tcgetattr(f, t) ioctl(f, TCGETA, t)
# define tcsetattr(f, a, t) ioctl(f, a, t)
# undef TCSAFLUSH
# define TCSAFLUSH TCSETAF
# else
# undef termios
# define termios sgttyb
# define c_lflag sg_flags
# define tcgetattr(f, t) ioctl(f, TIOCGETP, t)
# define tcsetattr(f, a, t) ioctl(f, a, t)
# undef TCSAFLUSH
# define TCSAFLUSH TIOCSETP
# endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
static volatile sig_atomic_t signo;
static void handler __P((int));
static char *getln __P((int, char *, size_t));
/*
* Like getpass(3) but with timeout and echo flags.
*/
char *
tgetpass(prompt, timeout, flags)
const char *prompt;
int timeout;
int flags;
{
sigaction_t sa, savealrm, saveint, savehup, savequit, saveterm;
sigaction_t savetstp, savettin, savettou;
struct termios term, oterm;
char *pass;
static char buf[SUDO_PASS_MAX + 1];
int input, output, save_errno;
(void) fflush(stdout);
restart:
signo = 0;
pass = NULL;
save_errno = 0;
/* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
if (ISSET(flags, TGP_STDIN) ||
(input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
input = STDIN_FILENO;
output = STDERR_FILENO;
}
/*
* Catch signals that would otherwise cause the user to end
* up with echo turned off in the shell.
*/
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_INTERRUPT; /* don't restart system calls */
sa.sa_handler = handler;
(void) sigaction(SIGALRM, &sa, &savealrm);
(void) sigaction(SIGINT, &sa, &saveint);
(void) sigaction(SIGHUP, &sa, &savehup);
(void) sigaction(SIGQUIT, &sa, &savequit);
(void) sigaction(SIGTERM, &sa, &saveterm);
(void) sigaction(SIGTSTP, &sa, &savetstp);
(void) sigaction(SIGTTIN, &sa, &savettin);
(void) sigaction(SIGTTOU, &sa, &savettou);
/* Turn echo off/on as specified by flags. */
if (tcgetattr(input, &oterm) == 0) {
(void) memcpy(&term, &oterm, sizeof(term));
if (!ISSET(flags, TGP_ECHO))
CLR(term.c_lflag, ECHO|ECHONL);
#ifdef VSTATUS
term.c_cc[VSTATUS] = _POSIX_VDISABLE;
#endif
(void) tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
} else {
memset(&term, 0, sizeof(term));
memset(&oterm, 0, sizeof(oterm));
}
/* No output if we are already backgrounded. */
if (signo != SIGTTOU && signo != SIGTTIN) {
if (prompt)
(void) write(output, prompt, strlen(prompt));
if (timeout > 0)
alarm(timeout);
pass = getln(input, buf, sizeof(buf));
alarm(0);
save_errno = errno;
if (!ISSET(term.c_lflag, ECHO))
(void) write(output, "\n", 1);
}
/* Restore old tty settings and signals. */
if (memcmp(&term, &oterm, sizeof(term)) != 0) {
while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
errno == EINTR)
continue;
}
(void) sigaction(SIGALRM, &savealrm, NULL);
(void) sigaction(SIGINT, &saveint, NULL);
(void) sigaction(SIGHUP, &savehup, NULL);
(void) sigaction(SIGQUIT, &savequit, NULL);
(void) sigaction(SIGTERM, &saveterm, NULL);
(void) sigaction(SIGTSTP, &savetstp, NULL);
(void) sigaction(SIGTTIN, &savettin, NULL);
(void) sigaction(SIGTTOU, &savettou, NULL);
if (input != STDIN_FILENO)
(void) close(input);
/*
* If we were interrupted by a signal, resend it to ourselves
* now that we have restored the signal handlers.
*/
if (signo) {
kill(getpid(), signo);
switch (signo) {
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
goto restart;
}
}
if (save_errno)
errno = save_errno;
return(pass);
}
static char *
getln(fd, buf, bufsiz)
int fd;
char *buf;
size_t bufsiz;
{
char c, *cp;
ssize_t nr;
if (bufsiz == 0) {
errno = EINVAL;
return(NULL); /* sanity */
}
cp = buf;
nr = -1;
while (--bufsiz && (nr = read(fd, &c, 1)) == 1 && c != '\n' && c != '\r')
*cp++ = c;
*cp = '\0';
return(nr == -1 ? NULL : buf);
}
static void
handler(s)
int s;
{
if (s != SIGALRM)
signo = s;
}
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