03656ac1b0
the "core" Kerberos functionality. The rest of the userland will get their own changes later.
129 lines
4.0 KiB
C
129 lines
4.0 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. 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: kipd.c,v 1.13 1997/05/18 20:38:01 assar Exp $");
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static int
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fatal (int fd, char *s)
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{
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u_char err = 1;
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write (fd, &err, sizeof(err));
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write (fd, s, strlen(s)+1);
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syslog(LOG_ERR, s);
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return err;
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}
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static int
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recv_conn (int sock, des_cblock *key, des_key_schedule schedule,
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struct sockaddr_in *retaddr)
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{
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int status;
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KTEXT_ST ticket;
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AUTH_DAT auth;
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char instance[INST_SZ + 1];
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struct sockaddr_in thisaddr, thataddr;
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int addrlen;
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char version[KRB_SENDAUTH_VLEN + 1];
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u_char ok = 0;
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struct passwd *passwd;
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addrlen = sizeof(thisaddr);
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if (getsockname (sock, (struct sockaddr *)&thisaddr, &addrlen) < 0 ||
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addrlen != sizeof(thisaddr)) {
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return 1;
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}
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addrlen = sizeof(thataddr);
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if (getpeername (sock, (struct sockaddr *)&thataddr, &addrlen) < 0 ||
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addrlen != sizeof(thataddr)) {
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return 1;
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}
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k_getsockinst (sock, instance, sizeof(instance));
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status = krb_recvauth (KOPT_DO_MUTUAL, sock, &ticket, "rcmd", instance,
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&thataddr, &thisaddr, &auth, "", schedule,
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version);
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if (status != KSUCCESS ||
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strncmp(version, KIP_VERSION, KRB_SENDAUTH_VLEN) != 0) {
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return 1;
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}
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passwd = k_getpwnam ("root");
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if (passwd == NULL)
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return fatal (sock, "Cannot find root");
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if (kuserok(&auth, "root") != 0)
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return fatal (sock, "Permission denied");
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if (write (sock, &ok, sizeof(ok)) != sizeof(ok))
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return 1;
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memcpy(key, &auth.session, sizeof(des_cblock));
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*retaddr = thataddr;
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return 0;
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}
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static int
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doit(int sock)
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{
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struct sockaddr_in thataddr;
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des_key_schedule schedule;
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des_cblock key;
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int this;
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if (recv_conn (sock, &key, schedule, &thataddr))
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return 1;
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this = tunnel_open ();
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if (this < 0)
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fatal (sock, "Cannot open " _PATH_DEV TUNDEV);
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return copy_packets (this, sock, TUNMTU, &key, schedule);
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}
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/*
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* kipd - receive forwarded IP
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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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openlog(__progname, LOG_PID|LOG_CONS, LOG_DAEMON);
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signal (SIGCHLD, childhandler);
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return doit(0);
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}
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