cosmopolitan/libc/stdio/readpassphrase.c

/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:2;tab-width:8;coding:utf-8   -*-│
│ vi: set noet ft=c ts=2 sts=2 sw=2 fenc=utf-8                             :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ $OpenBSD: readpassphrase.c,v 1.26 2016/10/18 12:47:18 millert Exp $          │
│                                                                              │
│ Copyright (c) 2000-2002, 2007, 2010                                          │
│   Todd C. Miller <Todd.Miller@courtesan.com>                                 │
│                                                                              │
│ 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.             │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/stdio/readpassphrase.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/termios.h"
#include "libc/errno.h"
#include "libc/paths.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/consts/termios.h"
#include "libc/unistd.h"

__notice(readpassphrase_notice, "\
libbsd readpassphrase (ISC)\n\
Copyright (c) 2000-2002, 2007, 2010 Todd C. Miller <Todd.Miller@courtesan.com>");
// clang-format off

#ifndef TCSASOFT
#define TCSASOFT 0
#endif

#ifndef _NSIG
#if defined(NSIG)
#define _NSIG NSIG
#else
/* The SIGRTMAX define might be set to a function such as sysconf(). */
#define _NSIG (SIGRTMAX + 1)
#endif
#endif

static volatile sig_atomic_t signo[_NSIG];

static void handler(int);

char *
readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
{
	ssize_t nr;
	int input, output, save_errno, i, need_restart;
	char ch, *p, *end;
	struct termios term, oterm;
	struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
	struct sigaction savetstp, savettin, savettou, savepipe;

	/* I suppose we could alloc on demand in this case (XXX). */
	if (bufsiz == 0) {
		errno = EINVAL;
		return(NULL);
	}

restart:
	for (i = 0; i < _NSIG; i++)
		signo[i] = 0;
	nr = -1;
	save_errno = 0;
	need_restart = 0;
	/*
	 * Read and write to /dev/tty if available.  If not, read from
	 * stdin and write to stderr unless a tty is required.
	 */
	if ((flags & RPP_STDIN) ||
	    (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
		if (flags & RPP_REQUIRE_TTY) {
			errno = ENOTTY;
			return(NULL);
		}
		input = STDIN_FILENO;
		output = STDERR_FILENO;
	}

	/*
	 * Turn off echo if possible.
	 * If we are using a tty but are not the foreground pgrp this will
	 * generate SIGTTOU, so do it *before* installing the signal handlers.
	 */
	if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
		memcpy(&term, &oterm, sizeof(term));
		if (!(flags & RPP_ECHO_ON))
			term.c_lflag &= ~(ECHO | ECHONL);
#ifdef VSTATUS
		if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
			term.c_cc[VSTATUS] = _POSIX_VDISABLE;
#endif
		(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
	} else {
		memset(&term, 0, sizeof(term));
		term.c_lflag |= ECHO;
		memset(&oterm, 0, sizeof(oterm));
		oterm.c_lflag |= ECHO;
	}

	/*
	 * Catch signals that would otherwise cause the user to end
	 * up with echo turned off in the shell.  Don't worry about
	 * things like SIGXCPU and SIGVTALRM for now.
	 */
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = 0;		/* don't restart system calls */
	sa.sa_handler = handler;
	(void)sigaction(SIGALRM, &sa, &savealrm);
	(void)sigaction(SIGHUP, &sa, &savehup);
	(void)sigaction(SIGINT, &sa, &saveint);
	(void)sigaction(SIGPIPE, &sa, &savepipe);
	(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 (!(flags & RPP_STDIN))
		(void)write(output, prompt, strlen(prompt));
	end = buf + bufsiz - 1;
	p = buf;
	while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
		if (p < end) {
			if ((flags & RPP_SEVENBIT))
				ch &= 0x7f;
			if (isalpha((unsigned char)ch)) {
				if ((flags & RPP_FORCELOWER))
					ch = (char)tolower((unsigned char)ch);
				if ((flags & RPP_FORCEUPPER))
					ch = (char)toupper((unsigned char)ch);
			}
			*p++ = ch;
		}
	}
	*p = '\0';
	save_errno = errno;
	if (!(term.c_lflag & ECHO))
		(void)write(output, "\n", 1);

	/* Restore old terminal settings and signals. */
	if (memcmp(&term, &oterm, sizeof(term)) != 0) {
		const int sigttou = signo[SIGTTOU];

		/* Ignore SIGTTOU generated when we are not the fg pgrp. */
		while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
		    errno == EINTR && !signo[SIGTTOU])
			continue;
		signo[SIGTTOU] = sigttou;
	}
	(void)sigaction(SIGALRM, &savealrm, NULL);
	(void)sigaction(SIGHUP, &savehup, NULL);
	(void)sigaction(SIGINT, &saveint, NULL);
	(void)sigaction(SIGQUIT, &savequit, NULL);
	(void)sigaction(SIGPIPE, &savepipe, 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.
	 */
	for (i = 0; i < _NSIG; i++) {
		if (signo[i]) {
			kill(getpid(), i);
			if (i == SIGTSTP || i == SIGTTIN || i == SIGTTOU) {
				need_restart = 1;
			}
		}
	}
	if (need_restart)
		goto restart;

	if (save_errno)
		errno = save_errno;
	return(nr == -1 ? NULL : buf);
}

#if 0
char *
getpass(const char *prompt)
{
	static char buf[_PASSWORD_LEN + 1];

	return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
}
#endif

static void handler(int s)
{
	signo[s] = 1;
}