#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
#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
#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
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#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
#endif
#include "sudo.h"
#ifndef lint
__unused static const char rcsid[] = "$Sudo: tgetpass.c,v 1.126 2008/12/09 20:55:49 millert Exp $";
#endif
#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
#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
#endif
static volatile sig_atomic_t signo;
static void handler __P((int));
static char *getln __P((int, char *, size_t));
static char *sudo_askpass __P((const char *));
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);
if (ISSET(flags, TGP_ASKPASS) && user_askpass)
return(sudo_askpass(prompt));
restart:
signo = 0;
pass = NULL;
save_errno = 0;
if (ISSET(flags, TGP_STDIN) ||
(input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
input = STDIN_FILENO;
output = STDERR_FILENO;
}
zero_bytes(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_INTERRUPT;
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);
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 {
zero_bytes(&term, sizeof(term));
zero_bytes(&oterm, sizeof(oterm));
}
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);
}
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 (signo) {
kill(getpid(), signo);
switch (signo) {
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
goto restart;
}
}
if (save_errno)
errno = save_errno;
return(pass);
}
static char *
sudo_askpass(prompt)
const char *prompt;
{
static char buf[SUDO_PASS_MAX + 1], *pass;
sigaction_t sa, saved_sa_pipe;
int pfd[2];
pid_t pid;
if (pipe(pfd) == -1)
error(1, "unable to create pipe");
if ((pid = fork()) == -1)
error(1, "unable to fork");
if (pid == 0) {
(void) dup2(pfd[1], STDOUT_FILENO);
set_perms(PERM_FULL_USER);
closefrom(STDERR_FILENO + 1);
execl(user_askpass, user_askpass, prompt, (char *)NULL);
warning("unable to run %s", user_askpass);
_exit(255);
}
zero_bytes(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = SIG_IGN;
(void) sigaction(SIGPIPE, &sa, &saved_sa_pipe);
(void) close(pfd[1]);
pass = getln(pfd[0], buf, sizeof(buf));
(void) close(pfd[0]);
(void) sigaction(SIGPIPE, &saved_sa_pipe, NULL);
return(pass);
}
static char *
getln(fd, buf, bufsiz)
int fd;
char *buf;
size_t bufsiz;
{
ssize_t nr = -1;
char *cp = buf;
char c = '\0';
if (bufsiz == 0) {
errno = EINVAL;
return(NULL);
}
while (--bufsiz) {
nr = read(fd, &c, 1);
if (nr != 1 || c == '\n' || c == '\r')
break;
*cp++ = c;
}
*cp = '\0';
return(nr == 1 ? buf : NULL);
}
static void
handler(s)
int s;
{
if (s != SIGALRM)
signo = s;
}
int
tty_present()
{
int fd;
if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) != -1)
close(fd);
return(fd != -1);
}