/* * Copyright (c) 1996, 1998-2005 Todd C. Miller * * 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 #endif #include #include #include #ifdef HAVE_SYS_BSDTYPES_H # include #endif /* HAVE_SYS_BSDTYPES_H */ #include #include #ifdef STDC_HEADERS # include # include #else # ifdef HAVE_STDLIB_H # include # endif #endif /* STDC_HEADERS */ #ifdef HAVE_STRING_H # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS) # include # endif # include #else # ifdef HAVE_STRINGS_H # include # endif #endif /* HAVE_STRING_H */ #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #include #include #include #include #ifdef HAVE_TERMIOS_H # include #else # ifdef HAVE_TERMIO_H # include # else # include # include # 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; }