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NetBSD/usr.sbin/portmap/portmap.c

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/* $NetBSD: portmap.c,v 1.15 1999/01/13 01:01:26 mjacob Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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 <sys/cdefs.h>
#ifndef lint
__COPYRIGHT(
"@(#) Copyright (c) 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)portmap.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: portmap.c,v 1.15 1999/01/13 01:01:26 mjacob Exp $");
#endif
#endif /* not lint */
/*
@(#)portmap.c 2.3 88/08/11 4.0 RPCSRC
static char sccsid[] = "@(#)portmap.c 1.32 87/08/06 Copyr 1984 Sun Micro";
*/
/*
* portmap.c, Implements the program,version to port number mapping for
* rpc.
*/
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/* who to suid to if -s is given */
#define RUN_AS "daemon"
#include <sys/types.h>
#include <sys/time.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#ifdef LIBWRAP
# include <tcpd.h>
#ifndef LIBWRAP_ALLOW_FACILITY
# define LIBWRAP_ALLOW_FACILITY LOG_AUTH
#endif
#ifndef LIBWRAP_ALLOW_SEVERITY
# define LIBWRAP_ALLOW_SEVERITY LOG_INFO
#endif
#ifndef LIBWRAP_DENY_FACILITY
# define LIBWRAP_DENY_FACILITY LOG_AUTH
#endif
#ifndef LIBWRAP_DENY_SEVERITY
# define LIBWRAP_DENY_SEVERITY LOG_WARNING
#endif
int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
#endif
struct encap_parms {
u_int arglen;
char *args;
};
struct rmtcallargs {
u_long rmt_prog;
u_long rmt_vers;
u_long rmt_port;
u_long rmt_proc;
struct encap_parms rmt_args;
};
static void callit __P((struct svc_req *, SVCXPRT *));
static struct pmaplist *find_service __P((u_long, u_long, u_long));
int main __P((int, char *[]));
void reap __P((int));
void toggle_verboselog __P((int));
void reg_service __P((struct svc_req *, SVCXPRT *));
static bool_t xdr_encap_parms __P((XDR *, struct encap_parms *));
static bool_t xdr_len_opaque_parms __P((XDR *, struct rmtcallargs *));
static bool_t xdr_opaque_parms __P((XDR *, struct rmtcallargs *));
static bool_t xdr_rmtcall_args __P((XDR *, struct rmtcallargs *));
static bool_t xdr_rmtcall_result __P((XDR *, struct rmtcallargs *));
void logit __P((int, struct sockaddr_in *, u_long, u_long, char *));
int check_access __P((struct sockaddr_in *, u_long, u_long));
int is_loopback __P((struct sockaddr_in *));
struct pmaplist *pmaplist;
int debugging = 0;
int runasdaemon = 0;
int verboselog = 0;
int
main(argc, argv)
int argc;
char **argv;
{
SVCXPRT *xprt;
int sock, c;
struct sockaddr_in addr;
int len = sizeof(struct sockaddr_in);
struct pmaplist *pml;
while ((c = getopt(argc, argv, "dls")) != -1) {
switch (c) {
case 'd':
debugging = 1;
break;
case 'l':
verboselog = 1;
break;
case 's':
runasdaemon = 1;
break;
default:
(void) fprintf(stderr, "usage: %s [-d]\n", argv[0]);
exit(1);
}
}
if (!debugging && daemon(0, 0)) {
(void) fprintf(stderr, "portmap: fork: %s", strerror(errno));
exit(1);
}
openlog("portmap", debugging ? LOG_PID | LOG_PERROR : LOG_PID,
LOG_DAEMON);
if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
syslog(LOG_ERR, "cannot create udp socket: %m");
exit(1);
}
memset((char *)&addr, 0, sizeof addr);
addr.sin_addr.s_addr = 0;
addr.sin_family = AF_INET;
addr.sin_port = htons(PMAPPORT);
if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
syslog(LOG_ERR, "cannot bind udp: %m");
exit(1);
}
if ((xprt = svcudp_create(sock)) == (SVCXPRT *)NULL) {
syslog(LOG_ERR, "couldn't do udp_create");
exit(1);
}
/* make an entry for ourself */
pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
pml->pml_next = 0;
pml->pml_map.pm_prog = PMAPPROG;
pml->pml_map.pm_vers = PMAPVERS;
pml->pml_map.pm_prot = IPPROTO_UDP;
pml->pml_map.pm_port = PMAPPORT;
pmaplist = pml;
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
syslog(LOG_ERR, "cannot create tcp socket: %m");
exit(1);
}
if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
syslog(LOG_ERR, "cannot bind udp: %m");
exit(1);
}
if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE))
== (SVCXPRT *)NULL) {
syslog(LOG_ERR, "couldn't do tcp_create");
exit(1);
}
/* make an entry for ourself */
pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
pml->pml_map.pm_prog = PMAPPROG;
pml->pml_map.pm_vers = PMAPVERS;
pml->pml_map.pm_prot = IPPROTO_TCP;
pml->pml_map.pm_port = PMAPPORT;
pml->pml_next = pmaplist;
pmaplist = pml;
(void)svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE);
(void)signal(SIGCHLD, reap);
(void) signal(SIGUSR1, toggle_verboselog);
if (runasdaemon) {
struct passwd *p;
if((p = getpwnam(RUN_AS)) == NULL) {
syslog(LOG_ERR, "cannot get uid of daemon: %m");
exit(1);
}
if (setuid(p->pw_uid) == -1) {
syslog(LOG_ERR, "setuid to daemon failed: %m");
exit(1);
}
}
svc_run();
syslog(LOG_ERR, "svc_run returned unexpectedly");
abort();
}
static struct pmaplist *
find_service(prog, vers, prot)
u_long prog, vers, prot;
{
struct pmaplist *hit = NULL;
struct pmaplist *pml;
for (pml = pmaplist; pml != NULL; pml = pml->pml_next) {
if ((pml->pml_map.pm_prog != prog) ||
(pml->pml_map.pm_prot != prot))
continue;
hit = pml;
if (pml->pml_map.pm_vers == vers)
break;
}
return (hit);
}
void
reg_service(rqstp, xprt)
struct svc_req *rqstp;
SVCXPRT *xprt;
{
struct pmap reg;
struct pmaplist *pml, *prevpml, *fnd;
long ans, port;
caddr_t t;
if (debugging)
(void) fprintf(stderr, "server: about to do a switch\n");
switch (rqstp->rq_proc) {
case PMAPPROC_NULL:
/*
* Null proc call
*/
check_access(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
if (!svc_sendreply(xprt, xdr_void, (caddr_t)0) && debugging) {
abort();
}
break;
case PMAPPROC_SET:
/*
* Set a program,version to port mapping
*/
if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg))
svcerr_decode(xprt);
else {
if (verboselog)
logit(allow_severity, svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, "");
if(!is_loopback(svc_getcaller(xprt))) {
ans = 0;
goto done;
}
/*
* check to see if already used
* find_service returns a hit even if
* the versions don't match, so check for it
*/
fnd = find_service(reg.pm_prog, reg.pm_vers,
reg.pm_prot);
if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) {
if (fnd->pml_map.pm_port == reg.pm_port) {
ans = 1;
goto done;
}
else {
ans = 0;
goto done;
}
} else {
/*
* add to END of list
*/
pml = (struct pmaplist *)
malloc((u_int)sizeof(struct pmaplist));
pml->pml_map = reg;
pml->pml_next = 0;
if (pmaplist == 0) {
pmaplist = pml;
} else {
for (fnd= pmaplist; fnd->pml_next != 0;
fnd = fnd->pml_next);
fnd->pml_next = pml;
}
ans = 1;
}
done:
if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
debugging) {
(void) fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_UNSET:
/*
* Remove a program,version to port mapping.
*/
if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg))
svcerr_decode(xprt);
else {
ans = 0;
if (verboselog)
logit(allow_severity, svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, "");
if(!is_loopback(svc_getcaller(xprt))) {
goto done;
}
for (prevpml = NULL, pml = pmaplist; pml != NULL; ) {
if ((pml->pml_map.pm_prog != reg.pm_prog) ||
(pml->pml_map.pm_vers != reg.pm_vers)) {
/* both pml & prevpml move forwards */
prevpml = pml;
pml = pml->pml_next;
continue;
}
/* found it; pml moves forward, prevpml stays */
ans = 1;
t = (caddr_t)pml;
pml = pml->pml_next;
if (prevpml == NULL)
pmaplist = pml;
else
prevpml->pml_next = pml;
free(t);
}
if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
debugging) {
(void) fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_GETPORT:
/*
* Lookup the mapping for a program,version and return its port
*/
if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg))
svcerr_decode(xprt);
else {
if (!check_access(svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog)) {
ans = 0;
/* this is a little bogus -- done is up above, under another case */
goto done;
}
fnd = find_service(reg.pm_prog, reg.pm_vers,
reg.pm_prot);
if (fnd)
port = fnd->pml_map.pm_port;
else
port = 0;
if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) && debugging) {
(void) fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_DUMP:
/*
* Return the current set of mapped program,version
*/
if (!svc_getargs(xprt, xdr_void, NULL))
svcerr_decode(xprt);
else {
struct pmaplist *p;
if (!check_access(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0)) {
p = 0; /* send empty list */
} else {
p = pmaplist;
}
if ((!svc_sendreply(xprt, xdr_pmaplist, (caddr_t)&p)) && debugging) {
(void) fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_CALLIT:
/*
* Calls a procedure on the local machine. If the requested
* procedure is not registered this procedure does not return
* error information!!
* This procedure is only supported on rpc/udp and calls via
* rpc/udp. It passes null authentication parameters.
*/
callit(rqstp, xprt);
break;
default:
check_access(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
svcerr_noproc(xprt);
break;
}
}
/*
* Stuff for the rmtcall service
*/
#define ARGSIZE 9000
static bool_t
xdr_encap_parms(xdrs, epp)
XDR *xdrs;
struct encap_parms *epp;
{
return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
}
static bool_t
xdr_rmtcall_args(xdrs, cap)
XDR *xdrs;
struct rmtcallargs *cap;
{
/* does not get a port number */
if (xdr_u_long(xdrs, &(cap->rmt_prog)) &&
xdr_u_long(xdrs, &(cap->rmt_vers)) &&
xdr_u_long(xdrs, &(cap->rmt_proc))) {
return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
}
return (FALSE);
}
static bool_t
xdr_rmtcall_result(xdrs, cap)
XDR *xdrs;
struct rmtcallargs *cap;
{
if (xdr_u_long(xdrs, &(cap->rmt_port)))
return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
return (FALSE);
}
/*
* only worries about the struct encap_parms part of struct rmtcallargs.
* The arglen must already be set!!
*/
static bool_t
xdr_opaque_parms(xdrs, cap)
XDR *xdrs;
struct rmtcallargs *cap;
{
return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen));
}
/*
* This routine finds and sets the length of incoming opaque parameters
* and then calls xdr_opaque_parms.
*/
static bool_t
xdr_len_opaque_parms(xdrs, cap)
XDR *xdrs;
struct rmtcallargs *cap;
{
u_int beginpos, lowpos, highpos, currpos, pos;
beginpos = lowpos = pos = xdr_getpos(xdrs);
highpos = lowpos + ARGSIZE;
while ((int)(highpos - lowpos) >= 0) {
currpos = (lowpos + highpos) / 2;
if (xdr_setpos(xdrs, currpos)) {
pos = currpos;
lowpos = currpos + 1;
} else {
highpos = currpos - 1;
}
}
xdr_setpos(xdrs, beginpos);
cap->rmt_args.arglen = pos - beginpos;
return (xdr_opaque_parms(xdrs, cap));
}
/*
* Call a remote procedure service
* This procedure is very quiet when things go wrong.
* The proc is written to support broadcast rpc. In the broadcast case,
* a machine should shut-up instead of complain, less the requestor be
* overrun with complaints at the expense of not hearing a valid reply ...
*
* This now forks so that the program & process that it calls can call
* back to the portmapper.
*/
static void
callit(rqstp, xprt)
struct svc_req *rqstp;
SVCXPRT *xprt;
{
struct rmtcallargs a;
struct pmaplist *pml;
u_short port;
struct sockaddr_in me;
int pid, so = -1, dontblock = 1;
CLIENT *client;
struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred;
struct timeval timeout;
char buf[ARGSIZE];
timeout.tv_sec = 5;
timeout.tv_usec = 0;
a.rmt_args.args = buf;
if (!svc_getargs(xprt, xdr_rmtcall_args, (caddr_t)&a))
return;
/* host and service access control */
if (!check_access(svc_getcaller(xprt), rqstp->rq_proc, a.rmt_prog))
return;
if ((pml = find_service(a.rmt_prog, a.rmt_vers,
(u_long)IPPROTO_UDP)) == NULL)
return;
/*
* fork a child to do the work. Parent immediately returns.
* Child exits upon completion.
*/
if ((pid = fork()) != 0) {
if (pid == -1)
syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m",
a.rmt_prog);
return;
}
port = pml->pml_map.pm_port;
get_myaddress(&me);
me.sin_port = htons(port);
/* Avoid implicit binding to reserved port by clntudp_create() */
so = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (so == -1)
exit(1);
if (ioctl(so, FIONBIO, &dontblock) == -1)
exit(1);
client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &so);
if (client != (CLIENT *)NULL) {
if (rqstp->rq_cred.oa_flavor == AUTH_UNIX) {
client->cl_auth = authunix_create(au->aup_machname,
au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids);
}
a.rmt_port = (u_long)port;
if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a,
xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS) {
svc_sendreply(xprt, xdr_rmtcall_result, (caddr_t)&a);
}
AUTH_DESTROY(client->cl_auth);
clnt_destroy(client);
}
(void)close(so);
exit(0);
}
void
reap(dummy)
int dummy;
{
int save_errno = errno;
while (wait3(NULL, WNOHANG, NULL) > 0)
;
errno = save_errno;
}
void
toggle_verboselog(dummy)
int dummy;
{
verboselog = !verboselog;
}
int
check_access(addr, proc, prog)
struct sockaddr_in *addr;
u_long proc;
u_long prog;
{
#ifdef LIBWRAP
struct request_info req;
#endif
#ifdef LIBWRAP
request_init(&req, RQ_DAEMON, "portmap", RQ_CLIENT_SIN, addr, 0);
fromhost(&req);
if(!hosts_access(&req)) {
logit(deny_severity, addr, proc, prog, ": request from unauthorized host");
return 0;
}
#endif
if (verboselog)
logit(allow_severity, addr, proc, prog, "");
return 1;
}
int
is_loopback(addr)
struct sockaddr_in *addr;
{
if (addr->sin_addr.s_addr != INADDR_LOOPBACK)
return 1;
return 0;
}
/* logit - report events of interest via the syslog daemon */
void
logit(severity, addr, procnum, prognum, text)
int severity;
struct sockaddr_in *addr;
u_long procnum;
u_long prognum;
char *text;
{
char *procname;
char procbuf[4 * sizeof(u_long)];
char *progname;
char progbuf[4 * sizeof(u_long)];
struct rpcent *rpc;
struct proc_map {
u_long code;
char *proc;
};
struct proc_map *procp;
static struct proc_map procmap[] = {
{PMAPPROC_CALLIT, "callit"},
{PMAPPROC_DUMP, "dump"},
{PMAPPROC_GETPORT, "getport"},
{PMAPPROC_NULL, "null"},
{PMAPPROC_SET, "set"},
{PMAPPROC_UNSET, "unset"},
{0, 0}
};
/*
* Fork off a process or the portmap daemon might hang while
* getrpcbynumber() or syslog() does its thing.
*/
if (fork() == 0) {
/* Try to map program number to name. */
if (prognum == 0) {
progname = "";
} else if ((rpc = getrpcbynumber((int) prognum))) {
progname = rpc->r_name;
} else {
snprintf(progname = progbuf, sizeof(progbuf), "%lu", prognum);
}
/* Try to map procedure number to name. */
for (procp = procmap; procp->proc && procp->code != procnum; procp++)
/* void */ ;
if ((procname = procp->proc) == 0)
snprintf(procname = procbuf, sizeof(procbuf), "%lu", (u_long) procnum);
/* Write syslog record. */
syslog(severity, "connect from %s to %s(%s)%s",
inet_ntoa(addr->sin_addr), procname, progname, text);
exit(0);
}
}
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