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