usr.sbin/rpcbind/pmap_svc.c

   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
  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 *
 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
 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 *)&reg)) {
 178                 svcerr_decode(xprt);
 179                 return (FALSE);
 180         }
 181
 182         if (!check_access(xprt, op, &reg, 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
 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 *)&reg)) {
 266                 svcerr_decode(xprt);
 267                 return (FALSE);
 268         }
 269
 270         if (!check_access(xprt, PMAPPROC_GETPORT, &reg, 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
 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 */