Import compat_readpassphrase.c from oconfigure
At 5d08070de6aadd979e3752263d2ec1e709bf037e.master
June McEnroe
parent
397b4ce6bd
commit
6013ae1513
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/*
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* Original: readpassphrase.c in OpenSSH portable
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*/
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/*
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* Copyright (c) 2000-2002, 2007, 2010
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* Todd C. Miller <millert@openbsd.org>
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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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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <pwd.h>
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#include <signal.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#if !defined(_NSIG) && defined(NSIG)
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# define _NSIG NSIG
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#endif
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static volatile sig_atomic_t readpassphrase_signo[_NSIG];
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static void
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readpassphrase_handler(int s)
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{
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readpassphrase_signo[s] = 1;
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}
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char *
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readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
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{
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ssize_t nr;
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int input, output, save_errno, i, need_restart;
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char ch, *p, *end;
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struct termios term, oterm;
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struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
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struct sigaction savetstp, savettin, savettou, savepipe;
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/* If we don't have TCSASOFT define it so that ORing it it below is a no-op. */
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#ifndef TCSASOFT
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const int tcasoft = 0;
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#else
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const int tcasoft = TCSASOFT;
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#endif
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/* I suppose we could alloc on demand in this case (XXX). */
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if (bufsiz == 0) {
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errno = EINVAL;
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return(NULL);
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}
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restart:
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for (i = 0; i < _NSIG; i++)
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readpassphrase_signo[i] = 0;
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nr = -1;
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save_errno = 0;
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need_restart = 0;
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/*
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* Read and write to /dev/tty if available. If not, read from
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* stdin and write to stderr unless a tty is required.
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*/
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if ((flags & RPP_STDIN) ||
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(input = output = open(_PATH_TTY, O_RDWR)) == -1) {
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if (flags & RPP_REQUIRE_TTY) {
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errno = ENOTTY;
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return(NULL);
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}
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input = STDIN_FILENO;
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output = STDERR_FILENO;
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}
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/*
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* Turn off echo if possible.
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* If we are using a tty but are not the foreground pgrp this will
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* generate SIGTTOU, so do it *before* installing the signal handlers.
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*/
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if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
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memcpy(&term, &oterm, sizeof(term));
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if (!(flags & RPP_ECHO_ON))
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term.c_lflag &= ~(ECHO | ECHONL);
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#ifdef VSTATUS
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if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
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term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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#endif
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(void)tcsetattr(input, TCSAFLUSH|tcasoft, &term);
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} else {
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memset(&term, 0, sizeof(term));
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term.c_lflag |= ECHO;
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memset(&oterm, 0, sizeof(oterm));
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oterm.c_lflag |= ECHO;
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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 SIGXCPU and SIGVTALRM 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 = readpassphrase_handler;
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(void)sigaction(SIGALRM, &sa, &savealrm);
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(void)sigaction(SIGHUP, &sa, &savehup);
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(void)sigaction(SIGINT, &sa, &saveint);
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(void)sigaction(SIGPIPE, &sa, &savepipe);
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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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if (!(flags & RPP_STDIN))
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(void)write(output, prompt, strlen(prompt));
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end = buf + bufsiz - 1;
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p = buf;
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while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
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if (p < end) {
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if ((flags & RPP_SEVENBIT))
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ch &= 0x7f;
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if (isalpha((unsigned char)ch)) {
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if ((flags & RPP_FORCELOWER))
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ch = (char)tolower((unsigned char)ch);
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if ((flags & RPP_FORCEUPPER))
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ch = (char)toupper((unsigned char)ch);
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}
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*p++ = ch;
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}
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}
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*p = '\0';
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save_errno = errno;
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if (!(term.c_lflag & ECHO))
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(void)write(output, "\n", 1);
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/* Restore old terminal settings and signals. */
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if (memcmp(&term, &oterm, sizeof(term)) != 0) {
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const int sigttou = readpassphrase_signo[SIGTTOU];
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/* Ignore SIGTTOU generated when we are not the fg pgrp. */
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while (tcsetattr(input, TCSAFLUSH|tcasoft, &oterm) == -1 &&
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errno == EINTR && !readpassphrase_signo[SIGTTOU])
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continue;
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readpassphrase_signo[SIGTTOU] = sigttou;
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}
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(void)sigaction(SIGALRM, &savealrm, NULL);
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(void)sigaction(SIGHUP, &savehup, NULL);
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(void)sigaction(SIGINT, &saveint, NULL);
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(void)sigaction(SIGQUIT, &savequit, NULL);
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(void)sigaction(SIGPIPE, &savepipe, 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_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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for (i = 0; i < _NSIG; i++) {
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if (readpassphrase_signo[i]) {
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kill(getpid(), i);
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switch (i) {
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case SIGTSTP:
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case SIGTTIN:
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case SIGTTOU:
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need_restart = 1;
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}
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}
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}
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if (need_restart)
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goto restart;
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if (save_errno)
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errno = save_errno;
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return(nr == -1 ? NULL : buf);
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}
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