283 lines
7.3 KiB
C
283 lines
7.3 KiB
C
/*
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* Copyright (c) 1996, 1998-2000 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* 4. Products derived from this software may not be called "Sudo" nor
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* may "Sudo" appear in their names without specific prior written
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* permission from the author.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <stdio.h>
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#ifdef STDC_HEADERS
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#include <stdlib.h>
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#endif /* STDC_HEADERS */
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <pwd.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_BSDTYPES_H
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#include <sys/bsdtypes.h>
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#endif /* HAVE_SYS_BSDTYPES_H */
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif /* HAVE_SYS_SELECT_H */
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#include <sys/time.h>
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#ifdef HAVE_TERMIOS_H
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#include <termios.h>
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#else
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#ifdef HAVE_TERMIO_H
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#include <termio.h>
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#else
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#include <sgtty.h>
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#include <sys/ioctl.h>
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#endif /* HAVE_TERMIO_H */
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#endif /* HAVE_TERMIOS_H */
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#include "sudo.h"
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#ifndef lint
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static const char rcsid[] = "$Sudo$";
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#endif /* lint */
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#ifndef TCSASOFT
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# define TCSASOFT 0
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#endif
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#ifndef ECHONL
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# define ECHONL 0
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#endif
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#ifndef _POSIX_VDISABLE
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# ifdef VDISABLE
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# define _POSIX_VDISABLE VDISABLE
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# else
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# define _POSIX_VDISABLE 0
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# endif
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#endif
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/*
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* Abstract method of getting at the term flags.
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*/
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#undef TERM
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#undef tflags
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#ifdef HAVE_TERMIOS_H
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# define TERM termios
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# define tflags c_lflag
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# define term_getattr(f, t) tcgetattr(f, t)
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# define term_setattr(f, t) tcsetattr(f, TCSAFLUSH|TCSASOFT, t)
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#else
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# ifdef HAVE_TERMIO_H
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# define TERM termio
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# define tflags c_lflag
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# define term_getattr(f, t) ioctl(f, TCGETA, t)
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# define term_setattr(f, t) ioctl(f, TCSETA, t)
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# else
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# define TERM sgttyb
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# define tflags sg_flags
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# define term_getattr(f, t) ioctl(f, TIOCGETP, t)
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# define term_setattr(f, t) ioctl(f, TIOCSETP, t)
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# endif /* HAVE_TERMIO_H */
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#endif /* HAVE_TERMIOS_H */
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static int signo; /* XXX - should be volatile sig_atomic_t */
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static char *tgetline __P((int, char *, size_t, int));
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static void handler __P((int));
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/*
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* Like getpass(3) but with timeout and echo flags.
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*/
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char *
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tgetpass(prompt, timeout, flags)
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const char *prompt;
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int timeout;
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int flags;
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{
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struct sigaction sa, saveint, savehup, savequit, saveterm, savetstp;
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static char buf[SUDO_PASS_MAX + 1];
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int input, output, save_errno;
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struct TERM term, oterm;
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char *pass;
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restart:
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/* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
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if ((flags & TGP_STDIN) ||
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(input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
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input = STDIN_FILENO;
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output = STDERR_FILENO;
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}
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if (prompt)
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(void) write(output, prompt, strlen(prompt));
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/*
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* Catch signals that would otherwise cause the user to end
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* up with echo turned off in the shell. Don't worry about
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* things like SIGALRM and SIGPIPE for now.
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*/
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0; /* don't restart system calls */
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sa.sa_handler = handler;
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(void)sigaction(SIGINT, &sa, &saveint);
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(void)sigaction(SIGHUP, &sa, &savehup);
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(void)sigaction(SIGQUIT, &sa, &savequit);
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(void)sigaction(SIGTERM, &sa, &saveterm);
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(void)sigaction(SIGTSTP, &sa, &savetstp);
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/* Turn echo off/on as specified by flags. */
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if (term_getattr(input, &oterm) == 0) {
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(void) memcpy(&term, &oterm, sizeof(term));
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if (!(flags & TGP_ECHO))
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term.tflags &= ~(ECHO | ECHONL);
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#ifdef VSTATUS
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term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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#endif
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(void) term_setattr(input, &term);
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} else {
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memset(&term, 0, sizeof(term));
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memset(&oterm, 0, sizeof(oterm));
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}
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pass = tgetline(input, buf, sizeof(buf), timeout);
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save_errno = errno;
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if (!(term.tflags & ECHO))
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(void) write(output, "\n", 1);
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/* Restore old tty settings and signals. */
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if (memcmp(&term, &oterm, sizeof(term)) != 0)
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(void) term_setattr(input, &oterm);
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(void) sigaction(SIGINT, &saveint, NULL);
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(void) sigaction(SIGHUP, &savehup, NULL);
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(void) sigaction(SIGQUIT, &savequit, NULL);
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(void) sigaction(SIGTERM, &saveterm, NULL);
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(void) sigaction(SIGTSTP, &savetstp, NULL);
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if (input != STDIN_FILENO)
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(void) close(input);
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/*
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* If we were interrupted by a signal, resend it to ourselves
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* now that we have restored the signal handlers.
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*/
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if (signo) {
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kill(getpid(), signo);
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if (signo == SIGTSTP) {
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signo = 0;
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goto restart;
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}
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}
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errno = save_errno;
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return(pass);
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}
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/*
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* Get a line of input (optionally timing out) and place it in buf.
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*/
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static char *
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tgetline(fd, buf, bufsiz, timeout)
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int fd;
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char *buf;
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size_t bufsiz;
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int timeout;
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{
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fd_set *readfds = NULL;
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struct timeval tv;
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size_t left;
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char *cp;
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char c;
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int n;
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if (bufsiz == 0) {
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errno = EINVAL;
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return(NULL); /* sanity */
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}
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cp = buf;
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left = bufsiz;
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/*
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* Timeout of <= 0 means no timeout.
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*/
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if (timeout > 0) {
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/* Setup for select(2) */
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n = howmany(fd + 1, NFDBITS) * sizeof(fd_mask);
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readfds = (fd_set *) emalloc(n);
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(void) memset((VOID *)readfds, 0, n);
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/* Set timeout for select */
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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while (--left) {
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FD_SET(fd, readfds);
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/* Make sure there is something to read (or timeout) */
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while ((n = select(fd + 1, readfds, 0, 0, &tv)) == -1 &&
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errno == EAGAIN)
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;
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if (n <= 0) {
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free(readfds);
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return(NULL); /* timeout or interrupt */
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}
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/* Read a character, exit loop on error, EOF or EOL */
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n = read(fd, &c, 1);
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if (n != 1 || c == '\n' || c == '\r')
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break;
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*cp++ = c;
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}
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free(readfds);
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} else {
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/* Keep reading until out of space, EOF, error, or newline */
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while (--left && (n = read(fd, &c, 1)) == 1 && c != '\n' && c != '\r')
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*cp++ = c;
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}
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*cp = '\0';
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return(n == -1 ? NULL : buf);
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}
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static void handler(s)
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int s;
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{
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signo = s;
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}
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