146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/* $OpenBSD: rusersd.c,v 1.24 2023/03/08 04:43:06 guenther Exp $ */
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/*-
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* Copyright (c) 1993 John Brezak
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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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* 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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* 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/rusers.h> /* New version */
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#include <rpcsvc/rnusers.h> /* Old version */
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#include <rpc/pmap_clnt.h>
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#include <utmp.h>
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extern void rusers_service(struct svc_req *, SVCXPRT *);
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int from_inetd = 1;
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int utmp_fd;
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static void
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cleanup(int signo)
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{
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_3); /* XXX signal races */
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_IDLE);
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_ORIG);
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_exit(0);
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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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int sock = 0, proto = 0;
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socklen_t fromlen;
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struct sockaddr_storage from;
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struct passwd *pw;
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SVCXPRT *transp;
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if ((utmp_fd = open(_PATH_UTMP, O_RDONLY)) == -1) {
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syslog(LOG_ERR, "cannot open %s", _PATH_UTMP);
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exit(1);
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}
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openlog("rpc.rusersd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON);
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pw = getpwnam("_rusersd");
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if (!pw) {
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syslog(LOG_ERR, "no such user _rusersd");
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exit(1);
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}
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if (unveil("/dev", "r") == -1) {
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syslog(LOG_ERR, "unveil /dev");
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exit(1);
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}
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if (unveil(NULL, NULL) == -1) {
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syslog(LOG_ERR, "unveil");
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exit(1);
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}
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setgroups(1, &pw->pw_gid);
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setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid);
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setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
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/*
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* See if inetd started us
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*/
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fromlen = sizeof(from);
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if (getsockname(0, (struct sockaddr *)&from, &fromlen) == -1) {
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from_inetd = 0;
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sock = RPC_ANYSOCK;
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proto = IPPROTO_UDP;
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}
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if (!from_inetd) {
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daemon(0, 0);
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_3);
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_IDLE);
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_ORIG);
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(void) signal(SIGINT, cleanup);
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(void) signal(SIGTERM, cleanup);
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(void) signal(SIGHUP, cleanup);
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}
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transp = svcudp_create(sock);
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if (transp == NULL) {
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syslog(LOG_ERR, "cannot create udp service.");
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exit(1);
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}
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if (!svc_register(transp, RUSERSPROG, RUSERSVERS_3, rusers_service, proto)) {
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syslog(LOG_ERR,
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"unable to register (RUSERSPROG, RUSERSVERS_3, %s).",
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proto ? "udp" : "(inetd)");
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exit(1);
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}
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if (!svc_register(transp, RUSERSPROG, RUSERSVERS_IDLE, rusers_service, proto)) {
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syslog(LOG_ERR,
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"unable to register (RUSERSPROG, RUSERSVERS_IDLE, %s).",
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proto ? "udp" : "(inetd)");
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exit(1);
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}
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if (!svc_register(transp, RUSERSPROG, RUSERSVERS_ORIG, rusers_service, proto)) {
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syslog(LOG_ERR,
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"unable to register (RUSERSPROG, RUSERSVERS_ORIG, %s).",
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proto ? "udp" : "(inetd)");
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exit(1);
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}
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svc_run();
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syslog(LOG_ERR, "svc_run returned");
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exit(1);
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}
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