+/* $OpenBSD: readpassphrase.c,v 1.18 2005/08/08 08:05:34 espie Exp $ */
+
/*
- * Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
+ * Copyright (c) 2000-2002 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.
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
+ * 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.
*
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 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.
*/
-#if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.5 2001/06/27 13:23:30 djm Exp $";
-#endif /* LIBC_SCCS and not lint */
+/* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
#include "includes.h"
#ifndef HAVE_READPASSPHRASE
#include <termios.h>
+#include <signal.h>
+#include <ctype.h>
+#include <fcntl.h>
#include <readpassphrase.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
#ifdef TCSASOFT
# define _T_FLUSH (TCSAFLUSH|TCSASOFT)
# define _T_FLUSH (TCSAFLUSH)
#endif
+/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
+#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
+# define _POSIX_VDISABLE VDISABLE
+#endif
+
+static volatile sig_atomic_t signo;
+
+static void handler(int);
+
char *
-readpassphrase(prompt, buf, bufsiz, flags)
- const char *prompt;
- char *buf;
- size_t bufsiz;
- int flags;
+readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
{
- struct termios term;
+ ssize_t nr;
+ int input, output, save_errno;
char ch, *p, *end;
- u_char status;
- int echo, input, output;
- sigset_t oset, nset;
+ 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) {
return(NULL);
}
+restart:
+ signo = 0;
/*
* Read and write to /dev/tty if available. If not, read from
* stdin and write to stderr unless a tty is required.
*/
- if ((input = output = open(_PATH_TTY, O_RDWR)) == -1) {
+ if ((flags & RPP_STDIN) ||
+ (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
if (flags & RPP_REQUIRE_TTY) {
errno = ENOTTY;
return(NULL);
}
/*
- * We block SIGINT and SIGTSTP so the terminal is not left
- * in an inconsistent state (ie: no echo). It would probably
- * be better to simply catch these though.
+ * 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(&nset);
- sigaddset(&nset, SIGINT);
- sigaddset(&nset, SIGTSTP);
- (void)sigprocmask(SIG_BLOCK, &nset, &oset);
+ 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);
/* Turn off echo if possible. */
- echo = 0;
- status = _POSIX_VDISABLE;
- if (tcgetattr(input, &term) == 0) {
- if (!(flags & RPP_ECHO_ON) && (term.c_lflag & ECHO)) {
- echo = 1;
- term.c_lflag &= ~ECHO;
- }
+ 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) {
- status = term.c_cc[VSTATUS];
+ if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
term.c_cc[VSTATUS] = _POSIX_VDISABLE;
- }
#endif
(void)tcsetattr(input, _T_FLUSH, &term);
- }
- if (!(flags & RPP_ECHO_ON)) {
- if (tcgetattr(input, &term) == 0 && (term.c_lflag & ECHO)) {
- echo = 1;
- term.c_lflag &= ~ECHO;
- (void)tcsetattr(input, _T_FLUSH, &term);
- }
+ } else {
+ memset(&term, 0, sizeof(term));
+ term.c_lflag |= ECHO;
+ memset(&oterm, 0, sizeof(oterm));
+ oterm.c_lflag |= ECHO;
}
- (void)write(output, prompt, strlen(prompt));
+ if (!(flags & RPP_STDIN))
+ (void)write(output, prompt, strlen(prompt));
end = buf + bufsiz - 1;
- for (p = buf; read(input, &ch, 1) == 1 && ch != '\n' && ch != '\r';) {
+ for (p = buf; (nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) {
if (p < end) {
if ((flags & RPP_SEVENBIT))
ch &= 0x7f;
}
}
*p = '\0';
- if (echo || status != _POSIX_VDISABLE) {
- if (echo) {
- (void)write(output, "\n", 1);
- term.c_lflag |= ECHO;
- }
-#ifdef VSTATUS
- if (status != _POSIX_VDISABLE)
- term.c_cc[VSTATUS] = status;
-#endif
- (void)tcsetattr(input, _T_FLUSH, &term);
+ 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) {
+ while (tcsetattr(input, _T_FLUSH, &oterm) == -1 &&
+ errno == EINTR)
+ continue;
}
- (void)sigprocmask(SIG_SETMASK, &oset, NULL);
+ (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);
- return(buf);
+
+ /*
+ * 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;
+ }
+ }
+
+ errno = save_errno;
+ return(nr == -1 ? NULL : buf);
}
-#endif /* HAVE_READPASSPHRASE */
#if 0
char *
-getpass(prompt)
- const char *prompt;
+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;
+}
+#endif /* HAVE_READPASSPHRASE */
andersk / openssh.git / blobdiff