/* $NetBSD: portmap.c,v 1.24 2000/04/10 20:26:31 tron 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 #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 1.24 2000/04/10 20:26:31 tron 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef LIBWRAP # include #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 #ifndef PORTMAP_LOG_FACILITY # define PORTMAP_LOG_FACILITY LOG_AUTH #endif #ifndef PORTMAP_LOG_SEVERITY # define PORTMAP_LOG_SEVERITY LOG_INFO #endif int log_severity = PORTMAP_LOG_FACILITY|PORTMAP_LOG_SEVERITY; 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 insecure = 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; extern char *__progname; while ((c = getopt(argc, argv, "dils")) != -1) { switch (c) { case 'd': debugging = 1; break; case 'i': insecure = 1; break; case 'l': verboselog = 1; break; case 's': runasdaemon = 1; break; default: (void)fprintf(stderr, "Usage: %s [-dils]\n", __progname); exit(1); } } if (!debugging && daemon(0, 0)) err(1, "fork failed"); pidfile(NULL); openlog(__progname, 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 tcp: %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)®)) svcerr_decode(xprt); else { if (!insecure && !is_loopback(svc_getcaller(xprt))) { if (verboselog) logit(log_severity, svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, " declined (non-loopback sender)"); ans = 0; goto done; } if (verboselog) logit(log_severity, svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, ""); /* * 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)®)) svcerr_decode(xprt); else { ans = 0; if (!insecure && !is_loopback(svc_getcaller(xprt))) { if (verboselog) logit(log_severity, svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, " declined (non-loopback sender)"); goto done; } if (verboselog) logit(log_severity, svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, ""); 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)®)) 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; } setproctitle("callit: %s", inet_ntoa(svc_getcaller(xprt)->sin_addr)); 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); sock_methods(&req); if(!hosts_access(&req)) { if (verboselog) logit(deny_severity, addr, proc, prog, ": request from unauthorized host"); return 0; } #endif if (verboselog) logit(log_severity, addr, proc, prog, ""); return 1; } int is_loopback(addr) struct sockaddr_in *addr; { if (addr->sin_addr.s_addr == htonl(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) { setproctitle("logit"); /* 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); } }