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Sync with OpenBSD, primarily better signal and terminal handling.

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Obtained from:	OpenBSD
MFC after:	2 weeks
This commit is contained in:
Xin LI 2010-11-13 10:38:06 +00:00
parent e04c378683
commit f29af3b2ac
3 changed files with 148 additions and 148 deletions
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40
include/readpassphrase.h
View File

@ -1,31 +1,24 @@
/* $OpenBSD: /usr/local/www/cvsroot/OpenBSD/src/include/readpassphrase.h,v 1.2 2002/02/16 21:27:17 millert Exp $ */
/* $OpenBSD: readpassphrase.h,v 1.5 2003/06/17 21:56:23 millert Exp $ */
/* $FreeBSD$ */
/*
* Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
* Copyright (c) 2000, 2002 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
* 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.
*
* 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.
* 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.
*/
#ifndef _READPASSPHRASE_H_
@ -37,6 +30,7 @@
#define RPP_FORCELOWER 0x04 /* Force input to lower case. */
#define RPP_FORCEUPPER 0x08 /* Force input to upper case. */
#define RPP_SEVENBIT 0x10 /* Strip the high bit from input. */
#define RPP_STDIN 0x20 /* Read from stdin, not /dev/tty */
#include <sys/cdefs.h>
#include <sys/_types.h>

112
lib/libc/gen/readpassphrase.3
View File

@ -1,33 +1,26 @@
.\" $OpenBSD: readpassphrase.3,v 1.7 2001/12/15 15:37:51 millert Exp $
.\" $OpenBSD: readpassphrase.3,v 1.17 2007/05/31 19:19:28 jmc 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>
.\"
.\" 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.
.\" 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.
.\"
.\" 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.
.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd December 7, 2001
.Dd May 31, 2007
.Dt READPASSPHRASE 3
.Os
.Sh NAME
@ -79,6 +72,8 @@ force input to lower case
force input to upper case
.It Dv RPP_SEVENBIT
strip the high bit from input
.It Dv RPP_STDIN
force read of passphrase from stdin
.El
.Pp
The calling process should zero the passphrase as soon as possible to
@ -87,7 +82,7 @@ space.
.Sh RETURN VALUES
Upon successful completion,
.Fn readpassphrase
returns a pointer to the null-terminated passphrase.
returns a pointer to the NUL-terminated passphrase.
If an error is encountered, the terminal state is restored and
a
.Dv NULL
@ -117,40 +112,6 @@ if (compare(transform(passbuf), epass) != 0)
memset(passbuf, 0, sizeof(passbuf));
.Ed
.Sh SIGNALS
The
.Fn readpassphrase
function
will catch the following signals:
.Pp
.Bl -tag -compact
.It Dv SIGINT
.It Dv SIGHUP
.It Dv SIGQUIT
.It Dv SIGTERM
.It Dv SIGTSTP
.It Dv SIGTTIN
.It Dv SIGTTOU
.El
.Pp
When one of the above signals is intercepted, terminal echo will
be restored if it had previously been turned off.
If a signal handler was installed for the signal when
.Fn readpassphrase
was called that handler is then executed.
If no handler was previously installed for the signal then the
default action is taken as per
.Xr sigaction 2 .
.Pp
The
.Dv SIGTSTP , SIGTTIN ,
and
.Dv SIGTTOU
signals (stop signal generated from keyboard or due to terminal I/O
from a background process) are treated specially.
When the process is resumed after it has been stopped,
.Fn readpassphrase
will reprint the prompt and the user may then enter a passphrase.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EINTR
@ -159,14 +120,14 @@ The
function was interrupted by a signal.
.It Bq Er EINVAL
The
.Fa bufsiz
.Ar bufsiz
argument was zero.
.It Bq Er EIO
The process is a member of a background process attempting to read
from its controlling terminal, the process is ignoring or blocking
the
.Dv SIGTTIN
signal or the process group is orphaned.
signal, or the process group is orphaned.
.It Bq Er EMFILE
The process has already reached its limit for open file descriptors.
.It Bq Er ENFILE
@ -176,6 +137,35 @@ There is no controlling terminal and the
.Dv RPP_REQUIRE_TTY
flag was specified.
.El
.Sh SIGNALS
The
.Fn readpassphrase
function
will catch the following signals:
.Bd -literal -offset indent
SIGALRM SIGHUP SIGINT
SIGPIPE SIGQUIT SIGTERM
SIGTSTP SIGTTIN SIGTTOU
.Ed
.Pp
When one of the above signals is intercepted, terminal echo will
be restored if it had previously been turned off.
If a signal handler was installed for the signal when
.Fn readpassphrase
was called, that handler is then executed.
If no handler was previously installed for the signal then the
default action is taken as per
.Xr sigaction 2 .
.Pp
The
.Dv SIGTSTP , SIGTTIN
and
.Dv SIGTTOU
signals (stop signals generated from keyboard or due to terminal I/O
from a background process) are treated specially.
When the process is resumed after it has been stopped,
.Fn readpassphrase
will reprint the prompt and the user may then enter a passphrase.
.Sh SEE ALSO
.Xr sigaction 2 ,
.Xr getpass 3

136
lib/libc/gen/readpassphrase.c
View File

@ -1,35 +1,26 @@
/* $OpenBSD: readpassphrase.c,v 1.12 2001/12/15 05:41:00 millert Exp $ */
/* $OpenBSD: readpassphrase.c,v 1.23 2010/05/14 13:30:34 millert Exp $ */
/*
* Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
* Copyright (c) 2000-2002, 2007, 2010
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
* 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.
*
* 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.
* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.12 2001/12/15 05:41:00 millert Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
@ -46,7 +37,7 @@ __FBSDID("$FreeBSD$");
#include <readpassphrase.h>
#include "un-namespace.h"
static volatile sig_atomic_t signo;
static volatile sig_atomic_t signo[NSIG];
static void handler(int);
@ -54,11 +45,11 @@ char *
readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
{
ssize_t nr;
int input, output, save_errno;
int input, output, save_errno, i, need_restart;
char ch, *p, *end;
struct termios term, oterm;
struct sigaction sa, saveint, savehup, savequit, saveterm;
struct sigaction savetstp, savettin, savettou;
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) {
@ -67,11 +58,17 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
}
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 ((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);
@ -81,23 +78,11 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
}
/*
* Catch signals that would otherwise cause the user to end
* up with echo turned off in the shell. Don't worry about
* things like SIGALRM and SIGPIPE for now.
* 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.
*/
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0; /* don't restart system calls */
sa.sa_handler = handler;
(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 off echo if possible. */
if (tcgetattr(input, &oterm) == 0) {
if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
memcpy(&term, &oterm, sizeof(term));
if (!(flags & RPP_ECHO_ON))
term.c_lflag &= ~(ECHO | ECHONL);
@ -106,20 +91,42 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
(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;
for (p = buf; (nr = _read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) {
p = buf;
while ((nr = _read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
if (p < end) {
if ((flags & RPP_SEVENBIT))
ch &= 0x7f;
if (isalpha(ch)) {
if ((flags & RPP_FORCELOWER))
ch = tolower(ch);
ch = (char)tolower(ch);
if ((flags & RPP_FORCEUPPER))
ch = toupper(ch);
ch = (char)toupper(ch);
}
*p++ = ch;
}
@ -130,11 +137,16 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
(void)_write(output, "\n", 1);
/* Restore old terminal settings and signals. */
if (memcmp(&term, &oterm, sizeof(term)) != 0)
(void)tcsetattr(input, TCSANOW|TCSASOFT, &oterm);
(void)_sigaction(SIGINT, &saveint, NULL);
if (memcmp(&term, &oterm, sizeof(term)) != 0) {
while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
errno == EINTR && !signo[SIGTTOU])
continue;
}
(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);
@ -146,17 +158,21 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
* 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) {
for (i = 0; i < NSIG; i++) {
if (signo[i]) {
kill(getpid(), i);
switch (i) {
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
signo = 0;
need_restart = 1;
}
}
}
if (need_restart)
goto restart;
}
}
if (save_errno)
errno = save_errno;
return(nr == -1 ? NULL : buf);
}
@ -174,5 +190,5 @@ getpass(const char *prompt)
static void handler(int s)
{
signo = s;
signo[s] = 1;
}