1 /*
2 * Copyright (c) 2009, Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 * @(#)pmap_svc.c 1.14 93/07/05 SMI; 1.23 89/04/05 Copyr 1984 Sun Micro
29 * $NetBSD: pmap_svc.c,v 1.2 2000/10/20 11:49:40 fvdl Exp $
30 * $FreeBSD: src/usr.sbin/rpcbind/pmap_svc.c,v 1.5 2007/11/07 10:53:39 kevlo Exp $
31 */
32 /*
33 * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
34 */
35
36 /*
37 * pmap_svc.c
38 * The server procedure for the version 2 portmaper.
39 * All the portmapper related interface from the portmap side.
40 */
41
42 #ifdef PORTMAP
43 #include <sys/types.h>
44 #include <sys/socket.h>
45 #include <stdio.h>
46 #include <rpc/rpc.h>
47 #include <rpc/pmap_prot.h>
48 #include <rpc/rpcb_prot.h>
49 #ifdef RPCBIND_DEBUG
50 #include <stdlib.h>
51 #endif
52 #include "rpcbind.h"
53
54 static struct pmaplist *find_service_pmap(rpcprog_t, rpcvers_t, rpcprot_t);
55 static bool_t pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
56 static bool_t pmapproc_getport(struct svc_req *, SVCXPRT *);
57 static bool_t pmapproc_dump(struct svc_req *, SVCXPRT *);
58
59 /*
60 * Called for all the version 2 inquiries.
61 */
62 void
pmap_service(struct svc_req * rqstp,SVCXPRT * xprt)63 pmap_service(struct svc_req *rqstp, SVCXPRT *xprt)
64 {
65 rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
66 switch (rqstp->rq_proc) {
67 case PMAPPROC_NULL:
68 /*
69 * Null proc call
70 */
71 #ifdef RPCBIND_DEBUG
72 if (debugging)
73 fprintf(stderr, "PMAPPROC_NULL\n");
74 #endif
75 check_access(xprt, rqstp->rq_proc, NULL, PMAPVERS);
76 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_void, NULL)) &&
77 debugging) {
78 if (doabort) {
79 rpcbind_abort();
80 }
81 }
82 break;
83
84 case PMAPPROC_SET:
85 /*
86 * Set a program, version to port mapping
87 */
88 pmapproc_change(rqstp, xprt, rqstp->rq_proc);
89 break;
90
91 case PMAPPROC_UNSET:
92 /*
93 * Remove a program, version to port mapping.
94 */
95 pmapproc_change(rqstp, xprt, rqstp->rq_proc);
96 break;
97
98 case PMAPPROC_GETPORT:
99 /*
100 * Lookup the mapping for a program, version and return its
101 * port number.
102 */
103 pmapproc_getport(rqstp, xprt);
104 break;
105
106 case PMAPPROC_DUMP:
107 /*
108 * Return the current set of mapped program, version
109 */
110 #ifdef RPCBIND_DEBUG
111 if (debugging)
112 fprintf(stderr, "PMAPPROC_DUMP\n");
113 #endif
114 pmapproc_dump(rqstp, xprt);
115 break;
116
117 case PMAPPROC_CALLIT:
118 /*
119 * Calls a procedure on the local machine. If the requested
120 * procedure is not registered this procedure does not return
121 * error information!!
122 * This procedure is only supported on rpc/udp and calls via
123 * rpc/udp. It passes null authentication parameters.
124 */
125 rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
126 break;
127
128 default:
129 svcerr_noproc(xprt);
130 break;
131 }
132 }
133
134 /*
135 * returns the item with the given program, version number. If that version
136 * number is not found, it returns the item with that program number, so that
137 * the port number is now returned to the caller. The caller when makes a
138 * call to this program, version number, the call will fail and it will
139 * return with PROGVERS_MISMATCH. The user can then determine the highest
140 * and the lowest version number for this program using clnt_geterr() and
141 * use those program version numbers.
142 */
143 static struct pmaplist *
find_service_pmap(rpcprog_t prog,rpcvers_t vers,rpcprot_t prot)144 find_service_pmap(rpcprog_t prog, rpcvers_t vers, rpcprot_t prot)
145 {
146 struct pmaplist *hit = NULL;
147 struct pmaplist *pml;
148
149 for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
150 if ((pml->pml_map.pm_prog != prog) ||
151 (pml->pml_map.pm_prot != prot))
152 continue;
153 hit = pml;
154 if (pml->pml_map.pm_vers == vers)
155 break;
156 }
157 return (hit);
158 }
159
160 static bool_t
pmapproc_change(struct svc_req * rqstp __unused,SVCXPRT * xprt,unsigned long op)161 pmapproc_change(struct svc_req *rqstp __unused, SVCXPRT *xprt, unsigned long op)
162 {
163 struct pmap reg;
164 RPCB rpcbreg;
165 long ans;
166 struct sockaddr_in *who;
167 uid_t uid;
168 char uidbuf[32];
169
170 #ifdef RPCBIND_DEBUG
171 if (debugging)
172 fprintf(stderr, "%s request for (%lu, %lu) : ",
173 op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
174 reg.pm_prog, reg.pm_vers);
175 #endif
176
177 if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
178 svcerr_decode(xprt);
179 return (FALSE);
180 }
181
182 if (!check_access(xprt, op, ®, PMAPVERS)) {
183 svcerr_weakauth(xprt);
184 return FALSE;
185 }
186
187 who = svc_getcaller(xprt);
188
189 /*
190 * Can't use getpwnam here. We might end up calling ourselves
191 * and looping.
192 */
193 if (__rpc_get_local_uid(xprt, &uid) < 0)
194 rpcbreg.r_owner = "unknown";
195 else if (uid == 0)
196 rpcbreg.r_owner = "superuser";
197 else {
198 /* r_owner will be strdup-ed later */
199 snprintf(uidbuf, sizeof uidbuf, "%d", uid);
200 rpcbreg.r_owner = uidbuf;
201 }
202
203 rpcbreg.r_prog = reg.pm_prog;
204 rpcbreg.r_vers = reg.pm_vers;
205
206 if (op == PMAPPROC_SET) {
207 char buf[32];
208
209 snprintf(buf, sizeof buf, "0.0.0.0.%d.%d",
210 (int)((reg.pm_port >> 8) & 0xff),
211 (int)(reg.pm_port & 0xff));
212 rpcbreg.r_addr = buf;
213 if (reg.pm_prot == IPPROTO_UDP) {
214 rpcbreg.r_netid = udptrans;
215 } else if (reg.pm_prot == IPPROTO_TCP) {
216 rpcbreg.r_netid = tcptrans;
217 } else {
218 ans = FALSE;
219 goto done_change;
220 }
221 ans = map_set(&rpcbreg, rpcbreg.r_owner);
222 } else if (op == PMAPPROC_UNSET) {
223 bool_t ans1, ans2;
224
225 rpcbreg.r_addr = NULL;
226 rpcbreg.r_netid = tcptrans;
227 ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
228 rpcbreg.r_netid = udptrans;
229 ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
230 ans = ans1 || ans2;
231 } else {
232 ans = FALSE;
233 }
234 done_change:
235 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t) &ans)) &&
236 debugging) {
237 fprintf(stderr, "portmap: svc_sendreply\n");
238 if (doabort) {
239 rpcbind_abort();
240 }
241 }
242 #ifdef RPCBIND_DEBUG
243 if (debugging)
244 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
245 #endif
246 if (op == PMAPPROC_SET)
247 rpcbs_set(RPCBVERS_2_STAT, ans);
248 else
249 rpcbs_unset(RPCBVERS_2_STAT, ans);
250 return (TRUE);
251 }
252
253 /* ARGSUSED */
254 static bool_t
pmapproc_getport(struct svc_req * rqstp __unused,SVCXPRT * xprt)255 pmapproc_getport(struct svc_req *rqstp __unused, SVCXPRT *xprt)
256 {
257 struct pmap reg;
258 long lport;
259 int port = 0;
260 struct pmaplist *fnd;
261 #ifdef RPCBIND_DEBUG
262 char *uaddr;
263 #endif
264
265 if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
266 svcerr_decode(xprt);
267 return (FALSE);
268 }
269
270 if (!check_access(xprt, PMAPPROC_GETPORT, ®, PMAPVERS)) {
271 svcerr_weakauth(xprt);
272 return FALSE;
273 }
274
275 #ifdef RPCBIND_DEBUG
276 if (debugging) {
277 uaddr = taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
278 svc_getrpccaller(xprt));
279 fprintf(stderr, "PMAP_GETPORT req for (%lu, %lu, %s) from %s :",
280 reg.pm_prog, reg.pm_vers,
281 reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
282 free(uaddr);
283 }
284 #endif
285 fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
286 if (fnd) {
287 char serveuaddr[32], *ua;
288 int h1, h2, h3, h4, p1, p2;
289 char *netid;
290
291 if (reg.pm_prot == IPPROTO_UDP) {
292 ua = udp_uaddr;
293 netid = udptrans;
294 } else {
295 ua = tcp_uaddr; /* To get the len */
296 netid = tcptrans;
297 }
298 if (ua == NULL) {
299 goto sendreply;
300 }
301 if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
302 &h4, &p1, &p2) == 6) {
303 p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
304 p2 = (fnd->pml_map.pm_port) & 0xff;
305 snprintf(serveuaddr, sizeof serveuaddr,
306 "%d.%d.%d.%d.%d.%d", h1, h2, h3, h4, p1, p2);
307 if (is_bound(netid, serveuaddr)) {
308 port = fnd->pml_map.pm_port;
309 } else { /* this service is dead; delete it */
310 delete_prog(reg.pm_prog);
311 }
312 }
313 }
314 sendreply:
315 lport = port;
316 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t)&lport)) &&
317 debugging) {
318 fprintf(stderr, "portmap: svc_sendreply\n");
319 if (doabort) {
320 rpcbind_abort();
321 }
322 }
323 #ifdef RPCBIND_DEBUG
324 if (debugging)
325 fprintf(stderr, "port = %d\n", port);
326 #endif
327 rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
328 reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
329 port ? udptrans : "");
330
331 return (TRUE);
332 }
333
334 /* ARGSUSED */
335 static bool_t
pmapproc_dump(struct svc_req * rqstp __unused,SVCXPRT * xprt)336 pmapproc_dump(struct svc_req *rqstp __unused, SVCXPRT *xprt)
337 {
338 if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
339 svcerr_decode(xprt);
340 return (FALSE);
341 }
342
343 if (!check_access(xprt, PMAPPROC_DUMP, NULL, PMAPVERS)) {
344 svcerr_weakauth(xprt);
345 return FALSE;
346 }
347
348 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
349 (caddr_t)&list_pml)) && debugging) {
350 if (debugging)
351 fprintf(stderr, "portmap: svc_sendreply\n");
352 if (doabort) {
353 rpcbind_abort();
354 }
355 }
356 return (TRUE);
357 }
358
359 #endif /* PORTMAP */
360