usr.sbin/rpcbind/pmap_svc.c

   1 /*      $NetBSD: pmap_svc.c,v 1.5 2007/05/13 20:03:47 christos Exp $    */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  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
  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 *
 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
 168 pmapproc_change(struct svc_req *rqstp, SVCXPRT *xprt, unsigned long op)
 169 {
 170         struct pmap reg;
 171         RPCB rpcbreg;
 172         long ans;
 173         struct sockaddr_in *who;
 174         struct sockcred *sc;
 175         char uidbuf[32];
 176
 177 #ifdef RPCBIND_DEBUG
 178         if (debugging)
 179                 fprintf(stderr, "%s request for (%lu, %lu) : ",
 180                     op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
 181                     reg.pm_prog, reg.pm_vers);
 182 #endif
 183
 184         if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
 185                 svcerr_decode(xprt);
 186                 return (FALSE);
 187         }
 188
 189         if (!check_access(xprt, op, &reg, PMAPVERS)) {
 190                 svcerr_weakauth(xprt);
 191                 return FALSE;
 192         }
 193
 194         who = svc_getcaller(xprt);
 195         sc = __svc_getcallercreds(xprt);
 196
 197         /*
 198          * Can't use getpwnam here. We might end up calling ourselves
 199          * and looping.
 200          */
 201         if (sc == NULL)
 202                 rpcbreg.r_owner = __UNCONST(rpcbind_unknown);
 203         else if (sc->sc_uid == 0)
 204                 rpcbreg.r_owner = __UNCONST(rpcbind_superuser);
 205         else {
 206                 /* r_owner will be strdup-ed later */
 207                 snprintf(uidbuf, sizeof uidbuf, "%d", sc->sc_uid);
 208                 rpcbreg.r_owner = uidbuf;
 209         }
 210
 211         rpcbreg.r_prog = reg.pm_prog;
 212         rpcbreg.r_vers = reg.pm_vers;
 213
 214         if (op == PMAPPROC_SET) {
 215                 char buf[32];
 216
 217                 snprintf(buf, sizeof(buf), "0.0.0.0.%d.%d",
 218                     (int)((reg.pm_port >> 8) & 0xff),
 219                     (int)(reg.pm_port & 0xff));
 220                 rpcbreg.r_addr = buf;
 221                 if (reg.pm_prot == IPPROTO_UDP) {
 222                         rpcbreg.r_netid = __UNCONST(udptrans);
 223                 } else if (reg.pm_prot == IPPROTO_TCP) {
 224                         rpcbreg.r_netid = __UNCONST(tcptrans);
 225                 } else {
 226                         ans = FALSE;
 227                         goto done_change;
 228                 }
 229                 ans = map_set(&rpcbreg, rpcbreg.r_owner);
 230         } else if (op == PMAPPROC_UNSET) {
 231                 bool_t ans1, ans2;
 232
 233                 rpcbreg.r_addr = NULL;
 234                 rpcbreg.r_netid = __UNCONST(tcptrans);
 235                 ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
 236                 rpcbreg.r_netid = __UNCONST(udptrans);
 237                 ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
 238                 ans = ans1 || ans2;
 239         } else {
 240                 ans = FALSE;
 241         }
 242 done_change:
 243         if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t) &ans)) &&
 244             debugging) {
 245                 fprintf(stderr, "portmap: svc_sendreply\n");
 246                 if (doabort) {
 247                         rpcbind_abort();
 248                 }
 249         }
 250 #ifdef RPCBIND_DEBUG
 251         if (debugging)
 252                 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
 253 #endif
 254         if (op == PMAPPROC_SET)
 255                 rpcbs_set(RPCBVERS_2_STAT, ans);
 256         else
 257                 rpcbs_unset(RPCBVERS_2_STAT, ans);
 258         return (TRUE);
 259 }
 260
 261 /* ARGSUSED */
 262 static bool_t
 263 pmapproc_getport(struct svc_req *rqstp, SVCXPRT *xprt)
 264 {
 265         struct pmap reg;
 266         long lport;
 267         int port = 0;
 268         struct pmaplist *fnd;
 269 #ifdef RPCBIND_DEBUG
 270         char *uaddr;
 271 #endif
 272
 273         if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
 274                 svcerr_decode(xprt);
 275                 return (FALSE);
 276         }
 277
 278         if (!check_access(xprt, PMAPPROC_GETPORT, &reg, PMAPVERS)) {
 279                 svcerr_weakauth(xprt);
 280                 return FALSE;
 281         }
 282
 283 #ifdef RPCBIND_DEBUG
 284         if (debugging) {
 285                 uaddr =  taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
 286                             svc_getrpccaller(xprt));
 287                 fprintf(stderr, "PMAP_GETPORT req for (%lu, %lu, %s) from %s :",
 288                         reg.pm_prog, reg.pm_vers,
 289                         reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
 290                 free(uaddr);
 291         }
 292 #endif
 293         fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
 294         if (fnd) {
 295                 char serveuaddr[32];
 296                 int h1, h2, h3, h4, p1, p2;
 297                 const char *netid, *ua;
 298
 299                 if (reg.pm_prot == IPPROTO_UDP) {
 300                         ua = udp_uaddr;
 301                         netid = udptrans;
 302                 } else {
 303                         ua = tcp_uaddr; /* To get the len */
 304                         netid = tcptrans;
 305                 }
 306                 if (ua == NULL) {
 307                         goto sendreply;
 308                 }
 309                 if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
 310                                 &h4, &p1, &p2) == 6) {
 311                         p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
 312                         p2 = (fnd->pml_map.pm_port) & 0xff;
 313                         snprintf(serveuaddr, sizeof(serveuaddr),
 314                             "%d.%d.%d.%d.%d.%d", h1, h2, h3, h4, p1, p2);
 315                         if (is_bound(netid, serveuaddr)) {
 316                                 port = fnd->pml_map.pm_port;
 317                         } else { /* this service is dead; delete it */
 318                                 delete_prog(reg.pm_prog);
 319                         }
 320                 }
 321         }
 322 sendreply:
 323         lport = port;
 324         if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t)&lport)) &&
 325                         debugging) {
 326                 (void) fprintf(stderr, "portmap: svc_sendreply\n");
 327                 if (doabort) {
 328                         rpcbind_abort();
 329                 }
 330         }
 331 #ifdef RPCBIND_DEBUG
 332         if (debugging)
 333                 fprintf(stderr, "port = %d\n", port);
 334 #endif
 335         rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
 336                 reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
 337                 port ? udptrans : "");
 338
 339         return (TRUE);
 340 }
 341
 342 /* ARGSUSED */
 343 static bool_t
 344 pmapproc_dump(struct svc_req *rqstp, SVCXPRT *xprt)
 345 {
 346         if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
 347                 svcerr_decode(xprt);
 348                 return (FALSE);
 349         }
 350
 351         if (!check_access(xprt, PMAPPROC_DUMP, NULL, PMAPVERS)) {
 352                 svcerr_weakauth(xprt);
 353                 return FALSE;
 354         }
 355
 356         if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
 357                         (caddr_t)&list_pml)) && debugging) {
 358                 if (debugging)
 359                         (void) fprintf(stderr, "portmap: svc_sendreply\n");
 360                 if (doabort) {
 361                         rpcbind_abort();
 362                 }
 363         }
 364         return (TRUE);
 365 }
 366
 367 #endif /* PORTMAP */