126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* $FreeBSD$ */
|
|
|
|
/*
|
|
* Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* 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. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
|
|
*/
|
|
|
|
#include "kip.h"
|
|
|
|
RCSID("$Id: kipd.c,v 1.16 1999/12/02 16:58:31 joda Exp $");
|
|
|
|
static int
|
|
fatal (int fd, char *s)
|
|
{
|
|
u_char err = 1;
|
|
|
|
write (fd, &err, sizeof(err));
|
|
write (fd, s, strlen(s)+1);
|
|
syslog(LOG_ERR, "%s", s);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
recv_conn (int sock, des_cblock *key, des_key_schedule schedule,
|
|
struct sockaddr_in *retaddr)
|
|
{
|
|
int status;
|
|
KTEXT_ST ticket;
|
|
AUTH_DAT auth;
|
|
char instance[INST_SZ];
|
|
struct sockaddr_in thisaddr, thataddr;
|
|
int addrlen;
|
|
char version[KRB_SENDAUTH_VLEN + 1];
|
|
u_char ok = 0;
|
|
struct passwd *passwd;
|
|
|
|
addrlen = sizeof(thisaddr);
|
|
if (getsockname (sock, (struct sockaddr *)&thisaddr, &addrlen) < 0 ||
|
|
addrlen != sizeof(thisaddr)) {
|
|
return 1;
|
|
}
|
|
addrlen = sizeof(thataddr);
|
|
if (getpeername (sock, (struct sockaddr *)&thataddr, &addrlen) < 0 ||
|
|
addrlen != sizeof(thataddr)) {
|
|
return 1;
|
|
}
|
|
|
|
k_getsockinst (sock, instance, sizeof(instance));
|
|
status = krb_recvauth (KOPT_DO_MUTUAL, sock, &ticket, "rcmd", instance,
|
|
&thataddr, &thisaddr, &auth, "", schedule,
|
|
version);
|
|
if (status != KSUCCESS ||
|
|
strncmp(version, KIP_VERSION, KRB_SENDAUTH_VLEN) != 0) {
|
|
return 1;
|
|
}
|
|
passwd = k_getpwnam ("root");
|
|
if (passwd == NULL)
|
|
return fatal (sock, "Cannot find root");
|
|
if (kuserok(&auth, "root") != 0)
|
|
return fatal (sock, "Permission denied");
|
|
if (write (sock, &ok, sizeof(ok)) != sizeof(ok))
|
|
return 1;
|
|
|
|
memcpy(key, &auth.session, sizeof(des_cblock));
|
|
*retaddr = thataddr;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
doit(int sock)
|
|
{
|
|
struct sockaddr_in thataddr;
|
|
des_key_schedule schedule;
|
|
des_cblock key;
|
|
int this;
|
|
|
|
if (recv_conn (sock, &key, schedule, &thataddr))
|
|
return 1;
|
|
this = tunnel_open ();
|
|
if (this < 0)
|
|
fatal (sock, "Cannot open " _PATH_DEV TUNDEV);
|
|
return copy_packets (this, sock, TUNMTU, &key, schedule);
|
|
}
|
|
|
|
/*
|
|
* kipd - receive forwarded IP
|
|
*/
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
set_progname (argv[0]);
|
|
|
|
roken_openlog(__progname, LOG_PID|LOG_CONS, LOG_DAEMON);
|
|
signal (SIGCHLD, childhandler);
|
|
return doit(0);
|
|
}
|