inet/rcmd.c

   1 /*
   2  * Copyright (C) 1998 WIDE Project.
   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
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 /*
  30  * Copyright (c) 1983, 1993, 1994
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #if defined(LIBC_SCCS) && !defined(lint)
  59 static char sccsid[] = "@(#)rcmd.c      8.3 (Berkeley) 3/26/94";
  60 #endif /* LIBC_SCCS and not lint */
  61
  62 #include <sys/param.h>
  63 #include <sys/poll.h>
  64 #include <sys/socket.h>
  65 #include <sys/stat.h>
  66
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69
  70 #include <alloca.h>
  71 #include <signal.h>
  72 #include <fcntl.h>
  73 #include <netdb.h>
  74 #include <unistd.h>
  75 #include <pwd.h>
  76 #include <errno.h>
  77 #include <stdio.h>
  78 #include <stdio_ext.h>
  79 #include <ctype.h>
  80 #include <string.h>
  81 #include <libintl.h>
  82 #include <stdlib.h>
  83 #ifdef USE_IN_LIBIO
  84 # include <wchar.h>
  85 #endif
  86
  87
  88 int __ivaliduser (FILE *, u_int32_t, const char *, const char *);
  89 static int __validuser2_sa (FILE *, struct sockaddr *, size_t,
  90                             const char *, const char *, const char *);
  91 static int ruserok2_sa (struct sockaddr *ra, size_t ralen,
  92                         int superuser, const char *ruser,
  93                         const char *luser, const char *rhost);
  94 static int ruserok_sa (struct sockaddr *ra, size_t ralen,
  95                         int superuser, const char *ruser,
  96                         const char *luser);
  97 int iruserok_af (const void *raddr, int superuser, const char *ruser,
  98                  const char *luser, sa_family_t af);
  99 int iruserok (u_int32_t raddr, int superuser, const char *ruser,
 100               const char *luser);
 101
 102 libc_hidden_proto (iruserok_af)
 103
 104 static char ahostbuf[NI_MAXHOST];
 105
 106 int
 107 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
 108         char **ahost;
 109         u_short rport;
 110         const char *locuser, *remuser, *cmd;
 111         int *fd2p;
 112         sa_family_t af;
 113 {
 114         char paddr[INET6_ADDRSTRLEN];
 115         struct addrinfo hints, *res, *ai;
 116         struct sockaddr_storage from;
 117         struct pollfd pfd[2];
 118         int32_t oldmask;
 119         pid_t pid;
 120         int s, lport, timo, error;
 121         char c;
 122         int refused;
 123         char num[8];
 124         ssize_t n;
 125
 126         if (af != AF_INET && af != AF_INET6 && af != AF_UNSPEC)
 127           {
 128             __set_errno (EAFNOSUPPORT);
 129             return -1;
 130           }
 131
 132         pid = __getpid();
 133
 134         memset(&hints, '\0', sizeof(hints));
 135         hints.ai_flags = AI_CANONNAME;
 136         hints.ai_family = af;
 137         hints.ai_socktype = SOCK_STREAM;
 138         (void)__snprintf(num, sizeof(num), "%d", ntohs(rport));
 139         error = getaddrinfo(*ahost, num, &hints, &res);
 140         if (error) {
 141 #ifdef USE_IN_LIBIO
 142                 if (_IO_fwide (stderr, 0) > 0)
 143                         __fwprintf(stderr, L"rcmd: getaddrinfo: %s\n",
 144                                    gai_strerror(error));
 145                 else
 146 #endif
 147                         fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 148                                 gai_strerror(error));
 149                 return (-1);
 150         }
 151
 152         pfd[0].events = POLLIN;
 153         pfd[1].events = POLLIN;
 154
 155         if (res->ai_canonname){
 156                 strncpy(ahostbuf, res->ai_canonname, sizeof(ahostbuf));
 157                 ahostbuf[sizeof(ahostbuf)-1] = '\0';
 158                 *ahost = ahostbuf;
 159         }
 160         else
 161                 *ahost = NULL;
 162         ai = res;
 163         refused = 0;
 164         oldmask = __sigblock(sigmask(SIGURG));
 165         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 166                 char errbuf[200];
 167
 168                 s = rresvport_af(&lport, ai->ai_family);
 169                 if (s < 0) {
 170                         if (errno == EAGAIN) {
 171 #ifdef USE_IN_LIBIO
 172                                 if (_IO_fwide (stderr, 0) > 0)
 173                                         __fwprintf(stderr, L"%s",
 174                                                    _("rcmd: socket: All ports in use\n"));
 175                                 else
 176 #endif
 177                                         fputs(_("rcmd: socket: All ports in use\n"),
 178                                               stderr);
 179                         } else {
 180 #ifdef USE_IN_LIBIO
 181                                 if (_IO_fwide (stderr, 0) > 0)
 182                                         __fwprintf(stderr,
 183                                                    L"rcmd: socket: %m\n");
 184                                 else
 185 #endif
 186                                         fprintf(stderr, "rcmd: socket: %m\n");
 187                         }
 188                         __sigsetmask(oldmask);
 189                         freeaddrinfo(res);
 190                         return -1;
 191                 }
 192                 __fcntl(s, F_SETOWN, pid);
 193                 if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 194                         break;
 195                 (void)__close(s);
 196                 if (errno == EADDRINUSE) {
 197                         lport--;
 198                         continue;
 199                 }
 200                 if (errno == ECONNREFUSED)
 201                         refused = 1;
 202                 if (ai->ai_next != NULL) {
 203                         int oerrno = errno;
 204                         char *buf = NULL;
 205
 206                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 207                                     paddr, sizeof(paddr),
 208                                     NULL, 0,
 209                                     NI_NUMERICHOST);
 210
 211                         if (__asprintf (&buf, _("connect to address %s: "),
 212                                         paddr) >= 0)
 213                           {
 214 #ifdef USE_IN_LIBIO
 215                             if (_IO_fwide (stderr, 0) > 0)
 216                               __fwprintf(stderr, L"%s", buf);
 217                             else
 218 #endif
 219                               fputs (buf, stderr);
 220                             free (buf);
 221                           }
 222                         __set_errno (oerrno);
 223                         perror(0);
 224                         ai = ai->ai_next;
 225                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 226                                     paddr, sizeof(paddr),
 227                                     NULL, 0,
 228                                     NI_NUMERICHOST);
 229                         if (__asprintf (&buf, _("Trying %s...\n"), paddr) >= 0)
 230                           {
 231 #ifdef USE_IN_LIBIO
 232                             if (_IO_fwide (stderr, 0) > 0)
 233                               __fwprintf (stderr, L"%s", buf);
 234                             else
 235 #endif
 236                               fputs (buf, stderr);
 237                             free (buf);
 238                           }
 239                         continue;
 240                 }
 241                 if (refused && timo <= 16) {
 242                         (void)__sleep(timo);
 243                         timo *= 2;
 244                         ai = res;
 245                         refused = 0;
 246                         continue;
 247                 }
 248                 freeaddrinfo(res);
 249 #ifdef USE_IN_LIBIO
 250                 if (_IO_fwide (stderr, 0) > 0)
 251                         (void)__fwprintf(stderr, L"%s: %s\n", *ahost,
 252                                          __strerror_r(errno,
 253                                                       errbuf, sizeof (errbuf)));
 254                 else
 255 #endif
 256                         (void)fprintf(stderr, "%s: %s\n", *ahost,
 257                                       __strerror_r(errno,
 258                                                    errbuf, sizeof (errbuf)));
 259                 __sigsetmask(oldmask);
 260                 return -1;
 261         }
 262         lport--;
 263         if (fd2p == 0) {
 264                 __write(s, "", 1);
 265                 lport = 0;
 266         } else {
 267                 char num[8];
 268                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 269                 socklen_t len = ai->ai_addrlen;
 270
 271                 if (s2 < 0)
 272                         goto bad;
 273                 __listen(s2, 1);
 274                 (void)__snprintf(num, sizeof(num), "%d", lport);
 275                 if (__write(s, num, strlen(num)+1) != (ssize_t)strlen(num)+1) {
 276                         char *buf = NULL;
 277
 278                         if (__asprintf (&buf, _("\
 279 rcmd: write (setting up stderr): %m\n")) >= 0)
 280                           {
 281 #ifdef USE_IN_LIBIO
 282                             if (_IO_fwide (stderr, 0) > 0)
 283                               __fwprintf(stderr, L"%s", buf);
 284                             else
 285 #endif
 286                               fputs (buf, stderr);
 287                             free (buf);
 288                           }
 289                         (void)__close(s2);
 290                         goto bad;
 291                 }
 292                 pfd[0].fd = s;
 293                 pfd[1].fd = s2;
 294                 __set_errno (0);
 295                 if (__poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
 296                         char *buf = NULL;
 297
 298                         if ((errno != 0
 299                              && __asprintf(&buf, _("\
 300 rcmd: poll (setting up stderr): %m\n")) >= 0)
 301                             || (errno == 0
 302                                 && __asprintf(&buf, _("\
 303 poll: protocol failure in circuit setup\n")) >= 0))
 304                           {
 305 #ifdef USE_IN_LIBIO
 306                             if (_IO_fwide (stderr, 0) > 0)
 307                               __fwprintf (stderr, L"%s", buf);
 308                             else
 309 #endif
 310                               fputs (buf, stderr);
 311                             free  (buf);
 312                           }
 313                         (void)__close(s2);
 314                         goto bad;
 315                 }
 316                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 317                 switch (from.ss_family) {
 318                 case AF_INET:
 319                         rport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 320                         break;
 321                 case AF_INET6:
 322                         rport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 323                         break;
 324                 default:
 325                         rport = 0;
 326                         break;
 327                 }
 328                 (void)__close(s2);
 329                 if (s3 < 0) {
 330 #ifdef USE_IN_LIBIO
 331                         if (_IO_fwide (stderr, 0) > 0)
 332                                 (void)__fwprintf(stderr,
 333                                                  L"rcmd: accept: %m\n");
 334                         else
 335 #endif
 336                                 (void)fprintf(stderr,
 337                                               "rcmd: accept: %m\n");
 338                         lport = 0;
 339                         goto bad;
 340                 }
 341                 *fd2p = s3;
 342
 343                 if (rport >= IPPORT_RESERVED || rport < IPPORT_RESERVED / 2){
 344                         char *buf = NULL;
 345
 346                         if (__asprintf(&buf, _("\
 347 socket: protocol failure in circuit setup\n")) >= 0)
 348                           {
 349 #ifdef USE_IN_LIBIO
 350                             if (_IO_fwide (stderr, 0) > 0)
 351                               __fwprintf (stderr, L"%s", buf);
 352                             else
 353 #endif
 354                               fputs (buf, stderr);
 355                             free (buf);
 356                           }
 357                         goto bad2;
 358                 }
 359         }
 360         (void)__write(s, locuser, strlen(locuser)+1);
 361         (void)__write(s, remuser, strlen(remuser)+1);
 362         (void)__write(s, cmd, strlen(cmd)+1);
 363         n = __read(s, &c, 1);
 364         if (n != 1) {
 365                 char *buf = NULL;
 366
 367                 if ((n == 0
 368                      && __asprintf(&buf, _("rcmd: %s: short read"),
 369                                    *ahost) >= 0)
 370                     || (n != 0
 371                         && __asprintf(&buf, "rcmd: %s: %m\n", *ahost) >= 0))
 372                   {
 373 #ifdef USE_IN_LIBIO
 374                     if (_IO_fwide (stderr, 0) > 0)
 375                       __fwprintf (stderr, L"%s", buf);
 376                     else
 377 #endif
 378                       fputs (buf, stderr);
 379                     free (buf);
 380                   }
 381                 goto bad2;
 382         }
 383         if (c != 0) {
 384                 while (__read(s, &c, 1) == 1) {
 385                         (void)__write(STDERR_FILENO, &c, 1);
 386                         if (c == '\n')
 387                                 break;
 388                 }
 389                 goto bad2;
 390         }
 391         __sigsetmask(oldmask);
 392         freeaddrinfo(res);
 393         return s;
 394 bad2:
 395         if (lport)
 396                 (void)__close(*fd2p);
 397 bad:
 398         (void)__close(s);
 399         __sigsetmask(oldmask);
 400         freeaddrinfo(res);
 401         return -1;
 402 }
 403 libc_hidden_def (rcmd_af)
 404
 405 int
 406 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 407         char **ahost;
 408         u_short rport;
 409         const char *locuser, *remuser, *cmd;
 410         int *fd2p;
 411 {
 412   return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 413 }
 414
 415 int
 416 rresvport_af(alport, family)
 417         int *alport;
 418         sa_family_t family;
 419 {
 420         struct sockaddr_storage ss;
 421         int s;
 422         size_t len;
 423         uint16_t *sport;
 424
 425         switch(family){
 426         case AF_INET:
 427                 len = sizeof(struct sockaddr_in);
 428                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 429                 break;
 430         case AF_INET6:
 431                 len = sizeof(struct sockaddr_in6);
 432                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 433                 break;
 434         default:
 435                 __set_errno (EAFNOSUPPORT);
 436                 return -1;
 437         }
 438         s = __socket(family, SOCK_STREAM, 0);
 439         if (s < 0)
 440                 return -1;
 441
 442         memset (&ss, '\0', sizeof(ss));
 443 #ifdef SALEN
 444         ss.__ss_len = len;
 445 #endif
 446         ss.ss_family = family;
 447
 448         for (;;) {
 449                 *sport = htons((uint16_t) *alport);
 450                 if (__bind(s, (struct sockaddr *)&ss, len) >= 0)
 451                         return s;
 452                 if (errno != EADDRINUSE) {
 453                         (void)__close(s);
 454                         return -1;
 455                 }
 456                 (*alport)--;
 457                 if (*alport == IPPORT_RESERVED/2)
 458                         break;
 459         }
 460         (void)__close(s);
 461         __set_errno (EAGAIN);
 462         return -1;
 463 }
 464 libc_hidden_def (rresvport_af)
 465
 466 int
 467 rresvport(alport)
 468         int *alport;
 469 {
 470         return rresvport_af(alport, AF_INET);
 471 }
 472
 473 int     __check_rhosts_file = 1;
 474 char    *__rcmd_errstr;
 475
 476 int
 477 ruserok_af(rhost, superuser, ruser, luser, af)
 478         const char *rhost, *ruser, *luser;
 479         int superuser;
 480         sa_family_t af;
 481 {
 482         struct addrinfo hints, *res, *res0;
 483         int gai;
 484         int ret;
 485
 486         memset (&hints, '\0', sizeof(hints));
 487         hints.ai_family = af;
 488         gai = getaddrinfo(rhost, NULL, &hints, &res0);
 489         if (gai)
 490                 return -1;
 491         ret = -1;
 492         for (res=res0; res; res=res->ai_next)
 493                 if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
 494                                 superuser, ruser, luser, rhost) == 0){
 495                         ret = 0;
 496                         break;
 497                 }
 498         freeaddrinfo(res0);
 499         return (ret);
 500 }
 501 libc_hidden_def (ruserok_af)
 502
 503 int
 504 ruserok(rhost, superuser, ruser, luser)
 505         const char *rhost, *ruser, *luser;
 506         int superuser;
 507 {
 508         return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
 509 }
 510
 511 /* Extremely paranoid file open function. */
 512 static FILE *
 513 iruserfopen (const char *file, uid_t okuser)
 514 {
 515   struct stat64 st;
 516   char *cp = NULL;
 517   FILE *res = NULL;
 518
 519   /* If not a regular file, if owned by someone other than user or
 520      root, if writeable by anyone but the owner, or if hardlinked
 521      anywhere, quit.  */
 522   cp = NULL;
 523   if (__lxstat64 (_STAT_VER, file, &st))
 524     cp = _("lstat failed");
 525   else if (!S_ISREG (st.st_mode))
 526     cp = _("not regular file");
 527   else
 528     {
 529       res = fopen (file, "r");
 530       if (!res)
 531         cp = _("cannot open");
 532       else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
 533         cp = _("fstat failed");
 534       else if (st.st_uid && st.st_uid != okuser)
 535         cp = _("bad owner");
 536       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 537         cp = _("writeable by other than owner");
 538       else if (st.st_nlink > 1)
 539         cp = _("hard linked somewhere");
 540     }
 541
 542   /* If there were any problems, quit.  */
 543   if (cp != NULL)
 544     {
 545       __rcmd_errstr = cp;
 546       if (res)
 547         fclose (res);
 548       return NULL;
 549     }
 550
 551   /* No threads use this stream.  */
 552   __fsetlocking (res, FSETLOCKING_BYCALLER);
 553
 554   return res;
 555 }
 556
 557 /*
 558  * New .rhosts strategy: We are passed an ip address. We spin through
 559  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 560  * has ip addresses, we don't have to trust a nameserver.  When it
 561  * contains hostnames, we spin through the list of addresses the nameserver
 562  * gives us and look for a match.
 563  *
 564  * Returns 0 if ok, -1 if not ok.
 565  */
 566 static int
 567 ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
 568      struct sockaddr *ra;
 569      size_t ralen;
 570      int superuser;
 571      const char *ruser, *luser, *rhost;
 572 {
 573   FILE *hostf = NULL;
 574   int isbad = -1;
 575
 576   if (!superuser)
 577     hostf = iruserfopen (_PATH_HEQUIV, 0);
 578
 579   if (hostf)
 580     {
 581       isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 582       fclose (hostf);
 583
 584       if (!isbad)
 585         return 0;
 586     }
 587
 588   if (__check_rhosts_file || superuser)
 589     {
 590       char *pbuf;
 591       struct passwd pwdbuf, *pwd;
 592       size_t dirlen;
 593       size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
 594       char *buffer = __alloca (buflen);
 595       uid_t uid;
 596
 597       if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
 598           || pwd == NULL)
 599         return -1;
 600
 601       dirlen = strlen (pwd->pw_dir);
 602       pbuf = alloca (dirlen + sizeof "/.rhosts");
 603       __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
 604                  "/.rhosts", sizeof "/.rhosts");
 605
 606        /* Change effective uid while reading .rhosts.  If root and
 607           reading an NFS mounted file system, can't read files that
 608           are protected read/write owner only.  */
 609        uid = __geteuid ();
 610        seteuid (pwd->pw_uid);
 611        hostf = iruserfopen (pbuf, pwd->pw_uid);
 612
 613        if (hostf != NULL)
 614          {
 615            isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 616            fclose (hostf);
 617          }
 618
 619        seteuid (uid);
 620        return isbad;
 621     }
 622   return -1;
 623 }
 624 /*
 625  * ruserok_sa() is now discussed on ipng, so
 626  * currently disabled for external use
 627  */
 628 static int ruserok_sa(ra, ralen, superuser, ruser, luser)
 629      struct sockaddr *ra;
 630      size_t ralen;
 631      int superuser;
 632      const char *ruser, *luser;
 633 {
 634   return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
 635 }
 636
 637 /* This is the exported version.  */
 638 int
 639 iruserok_af (raddr, superuser, ruser, luser, af)
 640      const void *raddr;
 641      int superuser;
 642      const char *ruser, *luser;
 643      sa_family_t af;
 644 {
 645   struct sockaddr_storage ra;
 646   size_t ralen;
 647
 648   memset (&ra, '\0', sizeof(ra));
 649   switch (af){
 650   case AF_INET:
 651     ((struct sockaddr_in *)&ra)->sin_family = AF_INET;
 652     memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr,
 653             sizeof(struct in_addr));
 654     ralen = sizeof(struct sockaddr_in);
 655     break;
 656   case AF_INET6:
 657     ((struct sockaddr_in6 *)&ra)->sin6_family = AF_INET6;
 658     memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr,
 659             sizeof(struct in6_addr));
 660     ralen = sizeof(struct sockaddr_in6);
 661     break;
 662   default:
 663     return 0;
 664   }
 665   return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser);
 666 }
 667 libc_hidden_def (iruserok_af)
 668
 669 int
 670 iruserok (raddr, superuser, ruser, luser)
 671      u_int32_t raddr;
 672      int superuser;
 673      const char *ruser, *luser;
 674 {
 675   return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
 676 }
 677
 678 /*
 679  * XXX
 680  * Don't make static, used by lpd(8).
 681  *
 682  * This function is not used anymore. It is only present because lpd(8)
 683  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 684  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 685  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 686  * or PAM.
 687  * Returns 0 if ok, -1 if not ok.
 688  */
 689 int
 690 __ivaliduser(hostf, raddr, luser, ruser)
 691         FILE *hostf;
 692         u_int32_t raddr;
 693         const char *luser, *ruser;
 694 {
 695         struct sockaddr_in ra;
 696         memset(&ra, '\0', sizeof(ra));
 697         ra.sin_family = AF_INET;
 698         ra.sin_addr.s_addr = raddr;
 699         return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
 700                                luser, ruser, "-");
 701 }
 702
 703
 704 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 705 static int
 706 internal_function
 707 __checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
 708                 const char *rhost)
 709 {
 710         struct addrinfo hints, *res0, *res;
 711         char raddr[INET6_ADDRSTRLEN];
 712         int match;
 713         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 714
 715         /* Check nis netgroup.  */
 716         if (strncmp ("+@", lhost, 2) == 0)
 717                 return innetgr (&lhost[2], rhost, NULL, NULL);
 718
 719         if (strncmp ("-@", lhost, 2) == 0)
 720                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 721
 722         /* -host */
 723         if (strncmp ("-", lhost,1) == 0) {
 724                 negate = -1;
 725                 lhost++;
 726         } else if (strcmp ("+",lhost) == 0) {
 727                 return 1;                    /* asking for trouble, but ok.. */
 728         }
 729
 730         /* Try for raw ip address first. */
 731         /* XXX */
 732         if (getnameinfo(ra, ralen,
 733                         raddr, sizeof(raddr), NULL, 0,
 734                         NI_NUMERICHOST) == 0
 735             && strcmp(raddr, lhost) == 0)
 736                 return negate;
 737
 738         /* Better be a hostname. */
 739         match = 0;
 740         memset(&hints, '\0', sizeof(hints));
 741         hints.ai_family = ra->sa_family;
 742         if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
 743                 /* Spin through ip addresses. */
 744                 for (res = res0; res; res = res->ai_next)
 745                   {
 746                     if (res->ai_family == ra->sa_family
 747                         && !memcmp(res->ai_addr, ra, res->ai_addrlen))
 748                       {
 749                         match = 1;
 750                         break;
 751                       }
 752                   }
 753                 freeaddrinfo (res0);
 754         }
 755         return negate * match;
 756 }
 757
 758 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 759 static int
 760 internal_function
 761 __icheckuser (const char *luser, const char *ruser)
 762 {
 763     /*
 764       luser is user entry from .rhosts/hosts.equiv file
 765       ruser is user id on remote host
 766       */
 767
 768     /* [-+]@netgroup */
 769     if (strncmp ("+@", luser, 2) == 0)
 770         return innetgr (&luser[2], NULL, ruser, NULL);
 771
 772     if (strncmp ("-@", luser,2) == 0)
 773         return -innetgr (&luser[2], NULL, ruser, NULL);
 774
 775     /* -user */
 776     if (strncmp ("-", luser, 1) == 0)
 777         return -(strcmp (&luser[1], ruser) == 0);
 778
 779     /* + */
 780     if (strcmp ("+", luser) == 0)
 781         return 1;
 782
 783     /* simple string match */
 784     return strcmp (ruser, luser) == 0;
 785 }
 786
 787 /*
 788  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 789  */
 790 static int
 791 __isempty (char *p)
 792 {
 793     while (*p && isspace (*p)) {
 794         ++p;
 795     }
 796
 797     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 798 }
 799
 800 /*
 801  * Returns 0 if positive match, -1 if _not_ ok.
 802  */
 803 static int
 804 __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
 805         FILE *hostf;
 806         struct sockaddr *ra;
 807         size_t ralen;
 808         const char *luser, *ruser, *rhost;
 809 {
 810     register const char *user;
 811     register char *p;
 812     int hcheck, ucheck;
 813     char *buf = NULL;
 814     size_t bufsize = 0;
 815     int retval = -1;
 816
 817     while (__getline (&buf, &bufsize, hostf) > 0) {
 818         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 819         p = buf;
 820
 821         /* Skip empty or comment lines */
 822         if (__isempty (p)) {
 823             continue;
 824         }
 825
 826         /* Skip lines that are too long. */
 827         if (strchr (p, '\n') == NULL) {
 828             int ch = getc_unlocked (hostf);
 829
 830             while (ch != '\n' && ch != EOF)
 831                 ch = getc_unlocked (hostf);
 832             continue;
 833         }
 834
 835         for (;*p && !isspace(*p); ++p) {
 836             *p = _tolower (*p);
 837         }
 838
 839         /* Next we want to find the permitted name for the remote user.  */
 840         if (*p == ' ' || *p == '\t') {
 841             /* <nul> terminate hostname and skip spaces */
 842             for (*p++='\0'; *p && isspace (*p); ++p);
 843
 844             user = p;                   /* this is the user's name */
 845             while (*p && !isspace (*p))
 846                 ++p;                    /* find end of user's name */
 847         } else
 848             user = p;
 849
 850         *p = '\0';              /* <nul> terminate username (+host?) */
 851
 852         /* buf -> host(?) ; user -> username(?) */
 853
 854         /* First check host part */
 855         hcheck = __checkhost_sa (ra, ralen, buf, rhost);
 856
 857         if (hcheck < 0)
 858             break;
 859
 860         if (hcheck) {
 861             /* Then check user part */
 862             if (! (*user))
 863                 user = luser;
 864
 865             ucheck = __icheckuser (user, ruser);
 866
 867             /* Positive 'host user' match? */
 868             if (ucheck > 0) {
 869                 retval = 0;
 870                 break;
 871             }
 872
 873             /* Negative 'host -user' match? */
 874             if (ucheck < 0)
 875                 break;
 876
 877             /* Neither, go on looking for match */
 878         }
 879     }
 880
 881     if (buf != NULL)
 882       free (buf);
 883
 884     return retval;
 885 }