143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/* $NetBSD: readpass.c,v 1.12 2003/07/10 01:09:46 lukem Exp $ */
|
|
/*
|
|
* Copyright (c) 2001 Markus Friedl. 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
RCSID("$OpenBSD: readpass.c,v 1.28 2003/01/23 13:50:27 markus Exp $");
|
|
__RCSID("$NetBSD: readpass.c,v 1.12 2003/07/10 01:09:46 lukem Exp $");
|
|
|
|
#include <readpassphrase.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "readpass.h"
|
|
#include "pathnames.h"
|
|
#include "log.h"
|
|
#include "ssh.h"
|
|
|
|
static char *
|
|
ssh_askpass(char *askpass, const char *msg)
|
|
{
|
|
pid_t pid;
|
|
size_t len;
|
|
char *pass;
|
|
int p[2], status, ret;
|
|
char buf[1024];
|
|
|
|
if (fflush(stdout) != 0)
|
|
error("ssh_askpass: fflush: %s", strerror(errno));
|
|
if (askpass == NULL)
|
|
fatal("internal error: askpass undefined");
|
|
if (pipe(p) < 0) {
|
|
error("ssh_askpass: pipe: %s", strerror(errno));
|
|
return NULL;
|
|
}
|
|
if ((pid = fork()) < 0) {
|
|
error("ssh_askpass: fork: %s", strerror(errno));
|
|
return NULL;
|
|
}
|
|
if (pid == 0) {
|
|
seteuid(getuid());
|
|
setuid(getuid());
|
|
close(p[0]);
|
|
if (dup2(p[1], STDOUT_FILENO) < 0)
|
|
fatal("ssh_askpass: dup2: %s", strerror(errno));
|
|
execlp(askpass, askpass, msg, (char *) 0);
|
|
fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
|
|
}
|
|
close(p[1]);
|
|
|
|
len = ret = 0;
|
|
do {
|
|
ret = read(p[0], buf + len, sizeof(buf) - 1 - len);
|
|
if (ret == -1 && errno == EINTR)
|
|
continue;
|
|
if (ret <= 0)
|
|
break;
|
|
len += ret;
|
|
} while (sizeof(buf) - 1 - len > 0);
|
|
buf[len] = '\0';
|
|
|
|
close(p[0]);
|
|
while (waitpid(pid, &status, 0) < 0)
|
|
if (errno != EINTR)
|
|
break;
|
|
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
|
memset(buf, 0, sizeof(buf));
|
|
return NULL;
|
|
}
|
|
|
|
buf[strcspn(buf, "\r\n")] = '\0';
|
|
pass = xstrdup(buf);
|
|
memset(buf, 0, sizeof(buf));
|
|
return pass;
|
|
}
|
|
|
|
/*
|
|
* Reads a passphrase from /dev/tty with echo turned off/on. Returns the
|
|
* passphrase (allocated with xmalloc). Exits if EOF is encountered. If
|
|
* RP_ALLOW_STDIN is set, the passphrase will be read from stdin if no
|
|
* tty is available
|
|
*/
|
|
char *
|
|
read_passphrase(const char *prompt, int flags)
|
|
{
|
|
char *askpass = NULL, *ret, buf[1024];
|
|
int rppflags, use_askpass = 0, ttyfd;
|
|
|
|
rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF;
|
|
if (flags & RP_ALLOW_STDIN) {
|
|
if (!isatty(STDIN_FILENO))
|
|
use_askpass = 1;
|
|
} else {
|
|
rppflags |= RPP_REQUIRE_TTY;
|
|
ttyfd = open(_PATH_TTY, O_RDWR);
|
|
if (ttyfd >= 0)
|
|
close(ttyfd);
|
|
else
|
|
use_askpass = 1;
|
|
}
|
|
|
|
if (use_askpass && getenv("DISPLAY")) {
|
|
if (getenv(SSH_ASKPASS_ENV))
|
|
askpass = getenv(SSH_ASKPASS_ENV);
|
|
else
|
|
askpass = _PATH_SSH_ASKPASS_DEFAULT;
|
|
if ((ret = ssh_askpass(askpass, prompt)) == NULL)
|
|
if (!(flags & RP_ALLOW_EOF))
|
|
return xstrdup("");
|
|
return ret;
|
|
}
|
|
|
|
if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) {
|
|
if (flags & RP_ALLOW_EOF)
|
|
return NULL;
|
|
return xstrdup("");
|
|
}
|
|
|
|
ret = xstrdup(buf);
|
|
memset(buf, 'x', sizeof buf);
|
|
return ret;
|
|
}
|