238 lines
6.0 KiB
C
238 lines
6.0 KiB
C
/*
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* Copyright (c) 1996, 1998-2004 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#ifdef __TANDEM
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# include <floss.h>
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#endif
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#include "config.h"
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#include <sys/types.h>
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#include <sys/param.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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#include <sys/time.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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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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# include <memory.h>
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# endif
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_H */
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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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#include <pwd.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, TCSETAF, 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 volatile sig_atomic_t signo;
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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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sigaction_t sa, savealrm, saveint, savehup, savequit, saveterm;
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sigaction_t savetstp, savettin, savettou;
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FILE *input, *output;
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struct TERM term, oterm;
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char *pass, *ep;
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static char buf[SUDO_PASS_MAX + 1];
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int fd, save_errno;
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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 (ISSET(flags, TGP_STDIN) ||
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(fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1 ||
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(input = output = fdopen(fd, "r+")) == NULL) {
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input = stdin;
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output = stderr;
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(void) fflush(output);
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}
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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(SIGALRM, &sa, &savealrm);
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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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(void) sigaction(SIGTTIN, &sa, &savettin);
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(void) sigaction(SIGTTOU, &sa, &savettou);
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/* Turn echo off/on as specified by flags. */
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if (term_getattr(fileno(input), &oterm) == 0) {
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(void) memcpy(&term, &oterm, sizeof(term));
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if (!ISSET(flags, TGP_ECHO))
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CLR(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(fileno(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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if (prompt) {
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(void) fputs(prompt, output);
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(void) fflush(output);
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if (input == output)
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(void) rewind(input);
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}
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if (timeout > 0)
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alarm(timeout);
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pass = fgets(buf, sizeof(buf), input);
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alarm(0);
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if (pass != NULL) {
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ep = pass + strlen(pass);
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while (ep > pass && (*--ep == '\n' || *ep == '\r'))
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*ep = '\0';
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}
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save_errno = errno;
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if (!ISSET(term.tflags, ECHO))
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fputc('\n', output);
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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(fileno(input), &oterm);
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(void) sigaction(SIGALRM, &savealrm, NULL);
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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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(void) sigaction(SIGTTIN, &savettin, NULL);
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(void) sigaction(SIGTTOU, &savettou, NULL);
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if (input != stdin)
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(void) fclose(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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switch (signo) {
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case SIGTSTP:
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case SIGTTIN:
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case SIGTTOU:
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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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static void
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handler(s)
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int s;
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{
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if (s != SIGALRM)
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signo = s;
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}
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