1 /* $NetBSD: pmap_svc.c,v 1.10 2021/03/07 00:23:06 christos Exp $ */
2 /* $FreeBSD: head/usr.sbin/rpcbind/pmap_svc.c 258564 2013-11-25 16:44:02Z hrs $ */
3
4 /*-
5 * Copyright (c) 2009, Sun Microsystems, Inc.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 * - Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 * - Neither the name of Sun Microsystems, Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 /*
32 * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
33 */
34
35 /* #ident "@(#)pmap_svc.c 1.14 93/07/05 SMI" */
36
37 #if 0
38 #ifndef lint
39 static char sccsid[] = "@(#)pmap_svc.c 1.23 89/04/05 Copyr 1984 Sun Micro";
40 #endif
41 #endif
42
43 /*
44 * pmap_svc.c
45 * The server procedure for the version 2 portmapper.
46 * All the portmapper related interface from the portmap side.
47 */
48
49 #ifdef PORTMAP
50 #include <sys/types.h>
51 #include <sys/socket.h>
52 #include <stdio.h>
53 #include <rpc/rpc.h>
54 #include <rpc/pmap_prot.h>
55 #include <rpc/rpcb_prot.h>
56 #ifdef RPCBIND_DEBUG
57 #include <stdlib.h>
58 #endif
59 #include "rpcbind.h"
60
61 static struct pmaplist *find_service_pmap(rpcprog_t, rpcvers_t, rpcprot_t);
62 static bool_t pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
63 static bool_t pmapproc_getport(struct svc_req *, SVCXPRT *);
64 static bool_t pmapproc_dump(struct svc_req *, SVCXPRT *);
65
66 /*
67 * Called for all the version 2 inquiries.
68 */
69 void
pmap_service(struct svc_req * rqstp,SVCXPRT * xprt)70 pmap_service(struct svc_req *rqstp, SVCXPRT *xprt)
71 {
72 rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
73 switch (rqstp->rq_proc) {
74 case PMAPPROC_NULL:
75 /*
76 * Null proc call
77 */
78 #ifdef RPCBIND_DEBUG
79 if (debugging)
80 fprintf(stderr, "PMAPPROC_NULL\n");
81 #endif
82 check_access(xprt, rqstp->rq_proc, NULL, PMAPVERS);
83 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_void, NULL)) &&
84 debugging) {
85 if (doabort) {
86 rpcbind_abort();
87 }
88 }
89 break;
90
91 case PMAPPROC_SET:
92 /*
93 * Set a program, version to port mapping
94 */
95 pmapproc_change(rqstp, xprt, rqstp->rq_proc);
96 break;
97
98 case PMAPPROC_UNSET:
99 /*
100 * Remove a program, version to port mapping.
101 */
102 pmapproc_change(rqstp, xprt, rqstp->rq_proc);
103 break;
104
105 case PMAPPROC_GETPORT:
106 /*
107 * Lookup the mapping for a program, version and return its
108 * port number.
109 */
110 pmapproc_getport(rqstp, xprt);
111 break;
112
113 case PMAPPROC_DUMP:
114 /*
115 * Return the current set of mapped program, version
116 */
117 #ifdef RPCBIND_DEBUG
118 if (debugging)
119 fprintf(stderr, "PMAPPROC_DUMP\n");
120 #endif
121 pmapproc_dump(rqstp, xprt);
122 break;
123
124 case PMAPPROC_CALLIT:
125 /*
126 * Calls a procedure on the local machine. If the requested
127 * procedure is not registered this procedure does not return
128 * error information!!
129 * This procedure is only supported on rpc/udp and calls via
130 * rpc/udp. It passes null authentication parameters.
131 */
132 rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
133 break;
134
135 default:
136 svcerr_noproc(xprt);
137 break;
138 }
139 }
140
141 /*
142 * returns the item with the given program, version number. If that version
143 * number is not found, it returns the item with that program number, so that
144 * the port number is now returned to the caller. The caller when makes a
145 * call to this program, version number, the call will fail and it will
146 * return with PROGVERS_MISMATCH. The user can then determine the highest
147 * and the lowest version number for this program using clnt_geterr() and
148 * use those program version numbers.
149 */
150 static struct pmaplist *
find_service_pmap(rpcprog_t prog,rpcvers_t vers,rpcprot_t prot)151 find_service_pmap(rpcprog_t prog, rpcvers_t vers, rpcprot_t prot)
152 {
153 register struct pmaplist *hit = NULL;
154 register struct pmaplist *pml;
155
156 for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
157 if ((pml->pml_map.pm_prog != prog) ||
158 (pml->pml_map.pm_prot != prot))
159 continue;
160 hit = pml;
161 if (pml->pml_map.pm_vers == vers)
162 break;
163 }
164 return (hit);
165 }
166
167 static bool_t
pmapproc_change(struct svc_req * rqstp __unused,SVCXPRT * xprt,unsigned long op)168 pmapproc_change(struct svc_req *rqstp __unused, SVCXPRT *xprt, unsigned long op)
169 {
170 struct pmap reg;
171 RPCB rpcbreg;
172 long ans;
173 struct sockcred *sc;
174 char uidbuf[32];
175
176 if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
177 svcerr_decode(xprt);
178 return (FALSE);
179 }
180
181 #ifdef RPCBIND_DEBUG
182 if (debugging)
183 fprintf(stderr, "%s request for (%lu, %lu) : ",
184 op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
185 reg.pm_prog, reg.pm_vers);
186 #endif
187
188 if (!check_access(xprt, op, ®, PMAPVERS)) {
189 svcerr_weakauth(xprt);
190 return FALSE;
191 }
192
193 (void)svc_getcaller(xprt);
194 sc = __svc_getcallercreds(xprt);
195
196 /*
197 * Can't use getpwnam here. We might end up calling ourselves
198 * and looping.
199 */
200 if (sc == NULL)
201 rpcbreg.r_owner = __UNCONST(rpcbind_unknown);
202 else if (sc->sc_uid == 0)
203 rpcbreg.r_owner = __UNCONST(rpcbind_superuser);
204 else {
205 /* r_owner will be strdup-ed later */
206 snprintf(uidbuf, sizeof uidbuf, "%d", sc->sc_uid);
207 rpcbreg.r_owner = uidbuf;
208 }
209
210 rpcbreg.r_prog = reg.pm_prog;
211 rpcbreg.r_vers = reg.pm_vers;
212
213 if (op == PMAPPROC_SET) {
214 char buf[32];
215
216 snprintf(buf, sizeof(buf), "0.0.0.0.%d.%d",
217 (int)((reg.pm_port >> 8) & 0xff),
218 (int)(reg.pm_port & 0xff));
219 rpcbreg.r_addr = buf;
220 if (reg.pm_prot == IPPROTO_UDP) {
221 rpcbreg.r_netid = __UNCONST(udptrans);
222 } else if (reg.pm_prot == IPPROTO_TCP) {
223 rpcbreg.r_netid = __UNCONST(tcptrans);
224 } else {
225 ans = FALSE;
226 goto done_change;
227 }
228 ans = map_set(&rpcbreg, rpcbreg.r_owner);
229 } else if (op == PMAPPROC_UNSET) {
230 bool_t ans1, ans2;
231
232 rpcbreg.r_addr = NULL;
233 rpcbreg.r_netid = __UNCONST(tcptrans);
234 ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
235 rpcbreg.r_netid = __UNCONST(udptrans);
236 ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
237 ans = ans1 || ans2;
238 } else {
239 ans = FALSE;
240 }
241 done_change:
242 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t) &ans)) &&
243 debugging) {
244 fprintf(stderr, "portmap: svc_sendreply\n");
245 if (doabort) {
246 rpcbind_abort();
247 }
248 }
249 #ifdef RPCBIND_DEBUG
250 if (debugging)
251 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
252 #endif
253 if (op == PMAPPROC_SET)
254 rpcbs_set(RPCBVERS_2_STAT, ans);
255 else
256 rpcbs_unset(RPCBVERS_2_STAT, ans);
257 return (TRUE);
258 }
259
260 /* ARGSUSED */
261 static bool_t
pmapproc_getport(struct svc_req * rqstp __unused,SVCXPRT * xprt)262 pmapproc_getport(struct svc_req *rqstp __unused, SVCXPRT *xprt)
263 {
264 struct pmap reg;
265 long lport;
266 int port = 0;
267 struct pmaplist *fnd;
268 #ifdef RPCBIND_DEBUG
269 char *uaddr;
270 #endif
271
272 if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
273 svcerr_decode(xprt);
274 return (FALSE);
275 }
276
277 if (!check_access(xprt, PMAPPROC_GETPORT, ®, PMAPVERS)) {
278 svcerr_weakauth(xprt);
279 return FALSE;
280 }
281
282 #ifdef RPCBIND_DEBUG
283 if (debugging) {
284 uaddr = taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
285 svc_getrpccaller(xprt));
286 fprintf(stderr, "PMAP_GETPORT req for (%lu, %lu, %s) from %s :",
287 reg.pm_prog, reg.pm_vers,
288 reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
289 free(uaddr);
290 }
291 #endif
292 fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
293 if (fnd) {
294 char serveuaddr[32];
295 int h1, h2, h3, h4, p1, p2;
296 const char *netid, *ua;
297
298 if (reg.pm_prot == IPPROTO_UDP) {
299 ua = udp_uaddr;
300 netid = udptrans;
301 } else {
302 ua = tcp_uaddr; /* To get the len */
303 netid = tcptrans;
304 }
305 if (ua == NULL) {
306 goto sendreply;
307 }
308 if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
309 &h4, &p1, &p2) == 6) {
310 p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
311 p2 = (fnd->pml_map.pm_port) & 0xff;
312 snprintf(serveuaddr, sizeof(serveuaddr),
313 "%d.%d.%d.%d.%d.%d", h1, h2, h3, h4, p1, p2);
314 if (is_bound(netid, serveuaddr)) {
315 port = fnd->pml_map.pm_port;
316 } else { /* this service is dead; delete it */
317 delete_prog(reg.pm_prog);
318 }
319 }
320 }
321 sendreply:
322 lport = port;
323 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t)&lport)) &&
324 debugging) {
325 (void) fprintf(stderr, "portmap: svc_sendreply\n");
326 if (doabort) {
327 rpcbind_abort();
328 }
329 }
330 #ifdef RPCBIND_DEBUG
331 if (debugging)
332 fprintf(stderr, "port = %d\n", port);
333 #endif
334 rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
335 reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
336 port ? udptrans : "");
337
338 return (TRUE);
339 }
340
341 /* ARGSUSED */
342 static bool_t
pmapproc_dump(struct svc_req * rqstp __unused,SVCXPRT * xprt)343 pmapproc_dump(struct svc_req *rqstp __unused, SVCXPRT *xprt)
344 {
345 if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
346 svcerr_decode(xprt);
347 return (FALSE);
348 }
349
350 if (!check_access(xprt, PMAPPROC_DUMP, NULL, PMAPVERS)) {
351 svcerr_weakauth(xprt);
352 return FALSE;
353 }
354
355 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
356 (caddr_t)&list_pml)) && debugging) {
357 if (debugging)
358 (void) fprintf(stderr, "portmap: svc_sendreply\n");
359 if (doabort) {
360 rpcbind_abort();
361 }
362 }
363 return (TRUE);
364 }
365
366 #endif /* PORTMAP */
367