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Introduce readpassphrase(3), a superset of getpass(3). This

Browse Source 
comes originally from Todd Miller.

Obtained from:	OpenBSD
This commit is contained in:
Brian Feldman 2001-11-20 15:15:42 +00:00
parent 6eb9bd2d1f
commit 13d98e8c66
7 changed files with 304 additions and 102 deletions
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2
include/Makefile
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@ -16,7 +16,7 @@ FILES= a.out.h ar.h assert.h bitstring.h complex.h ctype.h db.h \
libgen.h limits.h link.h locale.h malloc.h memory.h monetary.h mpool.h \
ndbm.h netconfig.h netdb.h nl_types.h nlist.h nsswitch.h objformat.h \
paths.h pthread.h pthread_np.h pwd.h \
ranlib.h regex.h regexp.h resolv.h rune.h runetype.h \
ranlib.h readpassphrase.h regex.h regexp.h resolv.h rune.h runetype.h \
search.h setjmp.h sgtty.h \
signal.h stab.h stdbool.h stddef.h stdio.h stdlib.h strhash.h \
string.h stringlist.h strings.h sysexits.h tar.h time.h timers.h \

47
include/readpassphrase.h Normal file
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@ -0,0 +1,47 @@
/* $OpenBSD: readpassphrase.h,v 1.1 2000/11/21 00:48:38 millert Exp $ */
/* $FreeBSD$ */
/*
* Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* 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.
*
* 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.
*/
#ifndef _READPASSPHRASE_H_
#define _READPASSPHRASE_H_
#define RPP_ECHO_OFF 0x00 /* Turn off echo (default). */
#define RPP_ECHO_ON 0x01 /* Leave echo on. */
#define RPP_REQUIRE_TTY 0x02 /* Fail if there is no tty. */
#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. */
#include <sys/cdefs.h>
__BEGIN_DECLS
char * readpassphrase __P((const char *, char *, size_t, int));
__END_DECLS
#endif /* !_READPASSPHRASE_H_ */

5
lib/libc/gen/Makefile.inc
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@ -13,7 +13,7 @@ SRCS+= __xuname.c _pthread_stubs.c _rand48.c _spinlock_stub.c _thread_init.c \
getcap.c getcwd.c getdomainname.c getgrent.c getgrouplist.c \
gethostname.c getloadavg.c getlogin.c getmntinfo.c getnetgrent.c \
getobjformat.c getosreldate.c getpagesize.c \
getpass.c getpeereid.c getprogname.c getpwent.c getttyent.c \
getpeereid.c getprogname.c getpwent.c getttyent.c \
getusershell.c getvfsbyname.c getvfsent.c glob.c \
initgroups.c isatty.c jrand48.c lcong48.c \
lockf.c lrand48.c mrand48.c msgctl.c \
@ -21,6 +21,7 @@ SRCS+= __xuname.c _pthread_stubs.c _rand48.c _spinlock_stub.c _thread_init.c \
nlist.c nrand48.c ntp_gettime.c opendir.c \
pause.c popen.c psignal.c pw_scan.c pwcache.c raise.c readdir.c rewinddir.c \
posixshm.c \
readpassphrase.c \
scandir.c seed48.c seekdir.c semconfig.c semctl.c semget.c semop.c \
setdomainname.c sethostname.c setjmperr.c setmode.c setprogname.c \
setproctitle.c \
@ -51,7 +52,7 @@ MAN+= alarm.3 arc4random.3 clock.3 \
glob.3 initgroups.3 isinf.3 \
ldexp.3 lockf.3 modf.3 msgctl.3 msgget.3 msgrcv.3 msgsnd.3 \
nice.3 nlist.3 pause.3 popen.3 psignal.3 pwcache.3 \
raise.3 rand48.3 rfork_thread.3 \
raise.3 rand48.3 readpassphrase.3 rfork_thread.3 \
scandir.3 setjmp.3 setmode.3 setproctitle.3 shm_open.3 \
siginterrupt.3 signal.3 sigsetops.3 sleep.3 stringlist.3 \
strtofflags.3 sysconf.3 sysctl.3 syslog.3 tcgetpgrp.3 \

1
lib/libc/gen/getpass.3
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@ -73,6 +73,7 @@ function returns a pointer to the null terminated password.
.El
.Sh SEE ALSO
.Xr crypt 3
.Xr readpassphrase 3
.Sh HISTORY
A
.Fn getpass

99
lib/libc/gen/getpass.c
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@ -1,99 +0,0 @@
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/termios.h>
#include <signal.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
#include "un-namespace.h"
static struct termios oterm, term;
static FILE *fp;
char *
getpass(prompt)
const char *prompt;
{
register int ch;
register char *p;
FILE *outfp;
static char buf[_PASSWORD_LEN + 1];
sigset_t oset, nset;
/*
* read and write to /dev/tty if possible; else read from
* stdin and write to stderr.
*/
if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
outfp = stderr;
fp = stdin;
}
/*
* note - blocking signals isn't necessarily the
* right thing, but we leave it for now.
*/
sigemptyset(&nset);
sigaddset(&nset, SIGINT);
sigaddset(&nset, SIGTSTP);
(void)_sigprocmask(SIG_BLOCK, &nset, &oset);
(void)tcgetattr(fileno(fp), &oterm);
term = oterm;
term.c_lflag &= ~ECHO;
(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
(void)fputs(prompt, outfp);
rewind(outfp); /* implied flush */
for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
if (p < buf + _PASSWORD_LEN)
*p++ = ch;
*p = '\0';
(void)_write(fileno(outfp), "\n", 1);
(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm);
(void)_sigprocmask(SIG_SETMASK, &oset, NULL);
if (fp != stdin)
(void)fclose(fp);
return(buf);
}

118
lib/libc/gen/readpassphrase.3 Normal file
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@ -0,0 +1,118 @@
.\" $OpenBSD: readpassphrase.3,v 1.3 2001/08/06 10:42:25 mpech Exp $
.\" $FreeBSD$
.\"
.\" Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
.\" All rights reserved.
.\"
.\" 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.
.\"
.\" 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.
.\"
.Dd November 20, 2000
.Dt READPASSPHRASE 3
.Os
.Sh NAME
.Nm readpassphrase
.Nd get a passphrase from the user
.Sh SYNOPSIS
.Fd #include <readpassphrase.h>
.Ft char *
.Fn readpassphrase "const char *prompt" "char *buf" "size_t bufsiz" "int flags"
.Sh DESCRIPTION
The
.Fn readpassphrase
function displays a prompt to, and reads in a passphrase from,
.Pa /dev/tty .
If this file is inaccessible
and the
.Dv RPP_REQUIRE_TTY
flag is not set,
.Fn readpassphrase
displays the prompt on the standard error output and reads from the standard
input.
In this case it is generally not possible to turn off echo.
.Pp
Up to
.Fa bufsiz
- 1 characters (one is for the NUL) are read into the provided buffer
.Fa buf .
Any additional
characters and the terminating newline (or return) character are discarded.
.Pp
.Fn readpassphrase
takes the following optional
.Fa flags :
.Pp
.Bd -literal -offset indent -compact
RPP_ECHO_OFF turn off echo (default behavior)
RPP_ECHO_ON leave echo on
RPP_REQUIRE_TTY fail if there is no tty
RPP_FORCELOWER force input to lower case
RPP_FORCEUPPER force input to upper case
RPP_SEVENBIT strip the high bit from input
.Ed
.Pp
The calling process should zero the passphrase as soon as possible to
avoid leaving the cleartext passphrase visible in the process's address
space.
.Sh RETURN VALUES
On success,
.Fn readpassphrase
returns a pointer to the null-terminated passphrase.
If the
.Dv RPP_REQUIRE_TTY
flag is set and
.Pa /dev/tty
is inaccessible,
.Fn readpassphrase
returns a null pointer.
.Sh EXAMPLES
The following code fragment will read a passphrase from
.Pa /dev/tty
into the buffer
.Fa passbuf.
.Bd -literal -offset indent
char passbuf[1024];
\&...
if (readpassphrase("Response: ", passbuf, sizeof(passbuf),
RPP_REQUIRE_TTY) == NULL)
errx(1, "unable to read passphrase");
if (compare(transform(passbuf), epass) != 0)
errx(1, "bad passphrase");
\&...
memset(passbuf, 0, sizeof(passbuf));
.Ed
.Sh FILES
.Bl -tag -width /dev/tty -compact
.It Pa /dev/tty
.El
.Sh SEE ALSO
.Xr getpass 3
.Sh HISTORY
The
.Fn readpassphrase
function first appeared in
.Ox 2.9 .

134
lib/libc/gen/readpassphrase.c Normal file
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@ -0,0 +1,134 @@
/*
* Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* 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.
*
* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.7 2001/08/07 19:34:11 millert Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <readpassphrase.h>
char *
readpassphrase(prompt, buf, bufsiz, flags)
const char *prompt;
char *buf;
size_t bufsiz;
int flags;
{
struct termios term, oterm;
char ch, *p, *end;
int input, output;
sigset_t oset, nset;
/* I suppose we could alloc on demand in this case (XXX). */
if (bufsiz == 0) {
errno = EINVAL;
return(NULL);
}
/*
* 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_REQUIRE_TTY) {
errno = ENOTTY;
return(NULL);
}
input = STDIN_FILENO;
output = STDERR_FILENO;
}
/*
* 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.
*/
sigemptyset(&nset);
sigaddset(&nset, SIGINT);
sigaddset(&nset, SIGTSTP);
(void)sigprocmask(SIG_BLOCK, &nset, &oset);
/* Turn off echo if possible. */
if (tcgetattr(input, &oterm) == 0) {
memcpy(&term, &oterm, sizeof(term));
if (!(flags & RPP_ECHO_ON) && (term.c_lflag & ECHO))
term.c_lflag &= ~ECHO;
if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
term.c_cc[VSTATUS] = _POSIX_VDISABLE;
(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
} else {
memset(&term, 0, sizeof(term));
memset(&oterm, 0, sizeof(oterm));
}
(void)write(output, prompt, strlen(prompt));
end = buf + bufsiz - 1;
for (p = buf; 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);
if ((flags & RPP_FORCEUPPER))
ch = toupper(ch);
}
*p++ = ch;
}
}
*p = '\0';
if (!(term.c_lflag & ECHO))
(void)write(output, "\n", 1);
/* Restore old terminal settings and signal mask. */
if (memcmp(&term, &oterm, sizeof(term)) != 0)
(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm);
(void)sigprocmask(SIG_SETMASK, &oset, NULL);
if (input != STDIN_FILENO)
(void)close(input);
return(buf);
}
char *
getpass(prompt)
const char *prompt;
{
static char buf[_PASSWORD_LEN + 1];
return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
}