GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/gen/readpassphrase.c Lines: 0 83 0.0 %
Date: 2017-11-13 Branches: 0 60 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: readpassphrase.c,v 1.26 2016/10/18 12:47:18 millert Exp $	*/
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/*
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 * Copyright (c) 2000-2002, 2007, 2010
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 *	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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#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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#include <readpassphrase.h>
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static volatile sig_atomic_t signo[_NSIG];
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static void handler(int);
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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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	/* 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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		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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		if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
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			term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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		(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &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 = 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 = signo[SIGTTOU];
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		/* Ignore SIGTTOU generated when we are not the fg pgrp. */
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		while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
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		    errno == EINTR && !signo[SIGTTOU])
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			continue;
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		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 (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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DEF_WEAK(readpassphrase);
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char *
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getpass(const char *prompt)
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{
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	static char buf[_PASSWORD_LEN + 1];
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	return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
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}
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static void handler(int s)
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{
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	signo[s] = 1;
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}