usr.sbin/rpcbind/pmap_svc.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)pmap_svc.c       1.14    93/07/05 SMI; 1.23 89/04/05 Copyr 1984 Sun Micro
  30  * $NetBSD: pmap_svc.c,v 1.2 2000/10/20 11:49:40 fvdl Exp $
  31  * $FreeBSD: src/usr.sbin/rpcbind/pmap_svc.c,v 1.5 2007/11/07 10:53:39 kevlo Exp $
  32  * $DragonFly$
  33  */
  34 /*
  35  * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
  36  */
  37
  38 /*
  39  * pmap_svc.c
  40  * The server procedure for the version 2 portmaper.
  41  * All the portmapper related interface from the portmap side.
  42  */
  43
  44 #ifdef PORTMAP
  45 #include <sys/types.h>
  46 #include <sys/socket.h>
  47 #include <stdio.h>
  48 #include <rpc/rpc.h>
  49 #include <rpc/pmap_prot.h>
  50 #include <rpc/rpcb_prot.h>
  51 #ifdef RPCBIND_DEBUG
  52 #include <stdlib.h>
  53 #endif
  54 #include "rpcbind.h"
  55
  56 static struct pmaplist  *find_service_pmap(rpcprog_t, rpcvers_t, rpcprot_t);
  57 static bool_t           pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
  58 static bool_t           pmapproc_getport(struct svc_req *, SVCXPRT *);
  59 static bool_t           pmapproc_dump(struct svc_req *, SVCXPRT *);
  60
  61 /*
  62  * Called for all the version 2 inquiries.
  63  */
  64 void
  65 pmap_service(struct svc_req *rqstp, SVCXPRT *xprt)
  66 {
  67         rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
  68         switch (rqstp->rq_proc) {
  69         case PMAPPROC_NULL:
  70                 /*
  71                  * Null proc call
  72                  */
  73 #ifdef RPCBIND_DEBUG
  74                 if (debugging)
  75                         fprintf(stderr, "PMAPPROC_NULL\n");
  76 #endif
  77                 check_access(xprt, rqstp->rq_proc, NULL, PMAPVERS);
  78                 if ((!svc_sendreply(xprt, (xdrproc_t) xdr_void, NULL)) &&
  79                         debugging) {
  80                         if (doabort) {
  81                                 rpcbind_abort();
  82                         }
  83                 }
  84                 break;
  85
  86         case PMAPPROC_SET:
  87                 /*
  88                  * Set a program, version to port mapping
  89                  */
  90                 pmapproc_change(rqstp, xprt, rqstp->rq_proc);
  91                 break;
  92
  93         case PMAPPROC_UNSET:
  94                 /*
  95                  * Remove a program, version to port mapping.
  96                  */
  97                 pmapproc_change(rqstp, xprt, rqstp->rq_proc);
  98                 break;
  99
 100         case PMAPPROC_GETPORT:
 101                 /*
 102                  * Lookup the mapping for a program, version and return its
 103                  * port number.
 104                  */
 105                 pmapproc_getport(rqstp, xprt);
 106                 break;
 107
 108         case PMAPPROC_DUMP:
 109                 /*
 110                  * Return the current set of mapped program, version
 111                  */
 112 #ifdef RPCBIND_DEBUG
 113                 if (debugging)
 114                         fprintf(stderr, "PMAPPROC_DUMP\n");
 115 #endif
 116                 pmapproc_dump(rqstp, xprt);
 117                 break;
 118
 119         case PMAPPROC_CALLIT:
 120                 /*
 121                  * Calls a procedure on the local machine. If the requested
 122                  * procedure is not registered this procedure does not return
 123                  * error information!!
 124                  * This procedure is only supported on rpc/udp and calls via
 125                  * rpc/udp. It passes null authentication parameters.
 126                  */
 127                 rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
 128                 break;
 129
 130         default:
 131                 svcerr_noproc(xprt);
 132                 break;
 133         }
 134 }
 135
 136 /*
 137  * returns the item with the given program, version number. If that version
 138  * number is not found, it returns the item with that program number, so that
 139  * the port number is now returned to the caller. The caller when makes a
 140  * call to this program, version number, the call will fail and it will
 141  * return with PROGVERS_MISMATCH. The user can then determine the highest
 142  * and the lowest version number for this program using clnt_geterr() and
 143  * use those program version numbers.
 144  */
 145 static struct pmaplist *
 146 find_service_pmap(rpcprog_t prog, rpcvers_t vers, rpcprot_t prot)
 147 {
 148         struct pmaplist *hit = NULL;
 149         struct pmaplist *pml;
 150
 151         for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
 152                 if ((pml->pml_map.pm_prog != prog) ||
 153                         (pml->pml_map.pm_prot != prot))
 154                         continue;
 155                 hit = pml;
 156                 if (pml->pml_map.pm_vers == vers)
 157                         break;
 158         }
 159         return (hit);
 160 }
 161
 162 static bool_t
 163 pmapproc_change(struct svc_req *rqstp __unused, SVCXPRT *xprt, unsigned long op)
 164 {
 165         struct pmap reg;
 166         RPCB rpcbreg;
 167         long ans;
 168         struct sockaddr_in *who;
 169         uid_t uid;
 170         char uidbuf[32];
 171
 172 #ifdef RPCBIND_DEBUG
 173         if (debugging)
 174                 fprintf(stderr, "%s request for (%lu, %lu) : ",
 175                     op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
 176                     reg.pm_prog, reg.pm_vers);
 177 #endif
 178
 179         if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
 180                 svcerr_decode(xprt);
 181                 return (FALSE);
 182         }
 183
 184         if (!check_access(xprt, op, &reg, PMAPVERS)) {
 185                 svcerr_weakauth(xprt);
 186                 return FALSE;
 187         }
 188
 189         who = svc_getcaller(xprt);
 190
 191         /*
 192          * Can't use getpwnam here. We might end up calling ourselves
 193          * and looping.
 194          */
 195         if (__rpc_get_local_uid(xprt, &uid) < 0)
 196                 rpcbreg.r_owner = "unknown";
 197         else if (uid == 0)
 198                 rpcbreg.r_owner = "superuser";
 199         else {
 200                 /* r_owner will be strdup-ed later */
 201                 snprintf(uidbuf, sizeof uidbuf, "%d", uid);
 202                 rpcbreg.r_owner = uidbuf;
 203         }
 204
 205         rpcbreg.r_prog = reg.pm_prog;
 206         rpcbreg.r_vers = reg.pm_vers;
 207
 208         if (op == PMAPPROC_SET) {
 209                 char buf[32];
 210
 211                 snprintf(buf, sizeof buf, "0.0.0.0.%d.%d",
 212                     (int)((reg.pm_port >> 8) & 0xff),
 213                     (int)(reg.pm_port & 0xff));
 214                 rpcbreg.r_addr = buf;
 215                 if (reg.pm_prot == IPPROTO_UDP) {
 216                         rpcbreg.r_netid = udptrans;
 217                 } else if (reg.pm_prot == IPPROTO_TCP) {
 218                         rpcbreg.r_netid = tcptrans;
 219                 } else {
 220                         ans = FALSE;
 221                         goto done_change;
 222                 }
 223                 ans = map_set(&rpcbreg, rpcbreg.r_owner);
 224         } else if (op == PMAPPROC_UNSET) {
 225                 bool_t ans1, ans2;
 226
 227                 rpcbreg.r_addr = NULL;
 228                 rpcbreg.r_netid = tcptrans;
 229                 ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
 230                 rpcbreg.r_netid = udptrans;
 231                 ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
 232                 ans = ans1 || ans2;
 233         } else {
 234                 ans = FALSE;
 235         }
 236 done_change:
 237         if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t) &ans)) &&
 238             debugging) {
 239                 fprintf(stderr, "portmap: svc_sendreply\n");
 240                 if (doabort) {
 241                         rpcbind_abort();
 242                 }
 243         }
 244 #ifdef RPCBIND_DEBUG
 245         if (debugging)
 246                 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
 247 #endif
 248         if (op == PMAPPROC_SET)
 249                 rpcbs_set(RPCBVERS_2_STAT, ans);
 250         else
 251                 rpcbs_unset(RPCBVERS_2_STAT, ans);
 252         return (TRUE);
 253 }
 254
 255 /* ARGSUSED */
 256 static bool_t
 257 pmapproc_getport(struct svc_req *rqstp __unused, SVCXPRT *xprt)
 258 {
 259         struct pmap reg;
 260         long lport;
 261         int port = 0;
 262         struct pmaplist *fnd;
 263 #ifdef RPCBIND_DEBUG
 264         char *uaddr;
 265 #endif
 266
 267         if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
 268                 svcerr_decode(xprt);
 269                 return (FALSE);
 270         }
 271
 272         if (!check_access(xprt, PMAPPROC_GETPORT, &reg, PMAPVERS)) {
 273                 svcerr_weakauth(xprt);
 274                 return FALSE;
 275         }
 276
 277 #ifdef RPCBIND_DEBUG
 278         if (debugging) {
 279                 uaddr =  taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
 280                             svc_getrpccaller(xprt));
 281                 fprintf(stderr, "PMAP_GETPORT req for (%lu, %lu, %s) from %s :",
 282                         reg.pm_prog, reg.pm_vers,
 283                         reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
 284                 free(uaddr);
 285         }
 286 #endif
 287         fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
 288         if (fnd) {
 289                 char serveuaddr[32], *ua;
 290                 int h1, h2, h3, h4, p1, p2;
 291                 char *netid;
 292
 293                 if (reg.pm_prot == IPPROTO_UDP) {
 294                         ua = udp_uaddr;
 295                         netid = udptrans;
 296                 } else {
 297                         ua = tcp_uaddr; /* To get the len */
 298                         netid = tcptrans;
 299                 }
 300                 if (ua == NULL) {
 301                         goto sendreply;
 302                 }
 303                 if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
 304                                 &h4, &p1, &p2) == 6) {
 305                         p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
 306                         p2 = (fnd->pml_map.pm_port) & 0xff;
 307                         snprintf(serveuaddr, sizeof serveuaddr,
 308                             "%d.%d.%d.%d.%d.%d", h1, h2, h3, h4, p1, p2);
 309                         if (is_bound(netid, serveuaddr)) {
 310                                 port = fnd->pml_map.pm_port;
 311                         } else { /* this service is dead; delete it */
 312                                 delete_prog(reg.pm_prog);
 313                         }
 314                 }
 315         }
 316 sendreply:
 317         lport = port;
 318         if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t)&lport)) &&
 319                         debugging) {
 320                 fprintf(stderr, "portmap: svc_sendreply\n");
 321                 if (doabort) {
 322                         rpcbind_abort();
 323                 }
 324         }
 325 #ifdef RPCBIND_DEBUG
 326         if (debugging)
 327                 fprintf(stderr, "port = %d\n", port);
 328 #endif
 329         rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
 330                 reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
 331                 port ? udptrans : "");
 332
 333         return (TRUE);
 334 }
 335
 336 /* ARGSUSED */
 337 static bool_t
 338 pmapproc_dump(struct svc_req *rqstp __unused, SVCXPRT *xprt)
 339 {
 340         if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
 341                 svcerr_decode(xprt);
 342                 return (FALSE);
 343         }
 344
 345         if (!check_access(xprt, PMAPPROC_DUMP, NULL, PMAPVERS)) {
 346                 svcerr_weakauth(xprt);
 347                 return FALSE;
 348         }
 349
 350         if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
 351                         (caddr_t)&list_pml)) && debugging) {
 352                 if (debugging)
 353                         fprintf(stderr, "portmap: svc_sendreply\n");
 354                 if (doabort) {
 355                         rpcbind_abort();
 356                 }
 357         }
 358         return (TRUE);
 359 }
 360
 361 #endif /* PORTMAP */