171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kip.h"
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RCSID("$Id: kip.c,v 1.18 1999/12/02 16:58:31 joda Exp $");
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static void
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usage(void)
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{
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fprintf (stderr, "Usage: %s host\n",
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__progname);
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exit (1);
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}
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/*
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* Establish authenticated connection
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*/
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static int
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connect_host (char *host, des_cblock *key, des_key_schedule schedule)
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{
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CREDENTIALS cred;
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KTEXT_ST text;
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MSG_DAT msg;
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int status;
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struct sockaddr_in thisaddr, thataddr;
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int addrlen;
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struct hostent *hostent;
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int s;
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u_char b;
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char **p;
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hostent = gethostbyname (host);
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if (hostent == NULL) {
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warnx ("gethostbyname '%s': %s", host,
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hstrerror(h_errno));
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return -1;
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}
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memset (&thataddr, 0, sizeof(thataddr));
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thataddr.sin_family = AF_INET;
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thataddr.sin_port = k_getportbyname ("kip", "tcp", htons(KIPPORT));
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for(p = hostent->h_addr_list; *p; ++p) {
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memcpy (&thataddr.sin_addr, *p, sizeof(thataddr.sin_addr));
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s = socket (AF_INET, SOCK_STREAM, 0);
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if (s < 0) {
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warn ("socket");
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return -1;
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}
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#if defined(TCP_NODELAY) && defined(HAVE_SETSOCKOPT)
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{
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int one = 1;
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setsockopt (s, IPPROTO_TCP, TCP_NODELAY,
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(void *)&one, sizeof(one));
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}
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#endif
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if (connect (s, (struct sockaddr *)&thataddr, sizeof(thataddr)) < 0) {
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warn ("connect(%s)", host);
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close (s);
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continue;
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} else {
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break;
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}
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}
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if (*p == NULL)
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return -1;
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addrlen = sizeof(thisaddr);
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if (getsockname (s, (struct sockaddr *)&thisaddr, &addrlen) < 0 ||
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addrlen != sizeof(thisaddr)) {
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warn ("getsockname(%s)", host);
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return -1;
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}
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status = krb_sendauth (KOPT_DO_MUTUAL, s, &text, "rcmd",
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host, krb_realmofhost (host),
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getpid(), &msg, &cred, schedule,
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&thisaddr, &thataddr, KIP_VERSION);
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if (status != KSUCCESS) {
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warnx("%s: %s", host,
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krb_get_err_text(status));
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return -1;
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}
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if (read (s, &b, sizeof(b)) != sizeof(b)) {
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warn ("read");
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return -1;
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}
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if (b) {
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char buf[BUFSIZ];
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read (s, buf, sizeof(buf));
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buf[BUFSIZ - 1] = '\0';
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warnx ("%s: %s", host, buf);
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return -1;
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}
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memcpy(key, &cred.session, sizeof(des_cblock));
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return s;
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}
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/*
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* Connect to the given host.
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*/
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static int
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doit (char *host)
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{
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des_key_schedule schedule;
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des_cblock iv;
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int other, this;
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other = connect_host (host, &iv, schedule);
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if (other < 0)
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return 1;
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this = tunnel_open ();
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if (this < 0)
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return 1;
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return copy_packets (this, other, TUNMTU, &iv, schedule);
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}
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/*
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* kip - forward IP packets over a kerberos-encrypted channel.
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*
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*/
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int
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main(int argc, char **argv)
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{
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set_progname (argv[0]);
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if (argc != 2)
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usage ();
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return doit (argv[1]);
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}
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