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 libc_freeres_ptr(static char *ahostbuf);
 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                 free (ahostbuf);
 157                 ahostbuf = strdup (res->ai_canonname);
 158                 if (ahostbuf == NULL) {
 159 #ifdef USE_IN_LIBIO
 160                         if (_IO_fwide (stderr, 0) > 0)
 161                                 __fwprintf(stderr, L"%s",
 162                                            _("rcmd: Cannot allocate memory\n"));
 163                         else
 164 #endif
 165                                 fputs(_("rcmd: Cannot allocate memory\n"),
 166                                       stderr);
 167                         return (-1);
 168                 }
 169                 *ahost = ahostbuf;
 170         } else
 171                 *ahost = NULL;
 172         ai = res;
 173         refused = 0;
 174         oldmask = __sigblock(sigmask(SIGURG));
 175         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 176                 char errbuf[200];
 177
 178                 s = rresvport_af(&lport, ai->ai_family);
 179                 if (s < 0) {
 180                         if (errno == EAGAIN) {
 181 #ifdef USE_IN_LIBIO
 182                                 if (_IO_fwide (stderr, 0) > 0)
 183                                         __fwprintf(stderr, L"%s",
 184                                                    _("rcmd: socket: All ports in use\n"));
 185                                 else
 186 #endif
 187                                         fputs(_("rcmd: socket: All ports in use\n"),
 188                                               stderr);
 189                         } else {
 190 #ifdef USE_IN_LIBIO
 191                                 if (_IO_fwide (stderr, 0) > 0)
 192                                         __fwprintf(stderr,
 193                                                    L"rcmd: socket: %m\n");
 194                                 else
 195 #endif
 196                                         fprintf(stderr, "rcmd: socket: %m\n");
 197                         }
 198                         __sigsetmask(oldmask);
 199                         freeaddrinfo(res);
 200                         return -1;
 201                 }
 202                 __fcntl(s, F_SETOWN, pid);
 203                 if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 204                         break;
 205                 (void)__close(s);
 206                 if (errno == EADDRINUSE) {
 207                         lport--;
 208                         continue;
 209                 }
 210                 if (errno == ECONNREFUSED)
 211                         refused = 1;
 212                 if (ai->ai_next != NULL) {
 213                         int oerrno = errno;
 214                         char *buf = NULL;
 215
 216                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 217                                     paddr, sizeof(paddr),
 218                                     NULL, 0,
 219                                     NI_NUMERICHOST);
 220
 221                         if (__asprintf (&buf, _("connect to address %s: "),
 222                                         paddr) >= 0)
 223                           {
 224 #ifdef USE_IN_LIBIO
 225                             if (_IO_fwide (stderr, 0) > 0)
 226                               __fwprintf(stderr, L"%s", buf);
 227                             else
 228 #endif
 229                               fputs (buf, stderr);
 230                             free (buf);
 231                           }
 232                         __set_errno (oerrno);
 233                         perror(0);
 234                         ai = ai->ai_next;
 235                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 236                                     paddr, sizeof(paddr),
 237                                     NULL, 0,
 238                                     NI_NUMERICHOST);
 239                         if (__asprintf (&buf, _("Trying %s...\n"), paddr) >= 0)
 240                           {
 241 #ifdef USE_IN_LIBIO
 242                             if (_IO_fwide (stderr, 0) > 0)
 243                               __fwprintf (stderr, L"%s", buf);
 244                             else
 245 #endif
 246                               fputs (buf, stderr);
 247                             free (buf);
 248                           }
 249                         continue;
 250                 }
 251                 if (refused && timo <= 16) {
 252                         (void)__sleep(timo);
 253                         timo *= 2;
 254                         ai = res;
 255                         refused = 0;
 256                         continue;
 257                 }
 258                 freeaddrinfo(res);
 259 #ifdef USE_IN_LIBIO
 260                 if (_IO_fwide (stderr, 0) > 0)
 261                         (void)__fwprintf(stderr, L"%s: %s\n", *ahost,
 262                                          __strerror_r(errno,
 263                                                       errbuf, sizeof (errbuf)));
 264                 else
 265 #endif
 266                         (void)fprintf(stderr, "%s: %s\n", *ahost,
 267                                       __strerror_r(errno,
 268                                                    errbuf, sizeof (errbuf)));
 269                 __sigsetmask(oldmask);
 270                 return -1;
 271         }
 272         lport--;
 273         if (fd2p == 0) {
 274                 __write(s, "", 1);
 275                 lport = 0;
 276         } else {
 277                 char num[8];
 278                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 279                 socklen_t len = ai->ai_addrlen;
 280
 281                 if (s2 < 0)
 282                         goto bad;
 283                 __listen(s2, 1);
 284                 (void)__snprintf(num, sizeof(num), "%d", lport);
 285                 if (__write(s, num, strlen(num)+1) != (ssize_t)strlen(num)+1) {
 286                         char *buf = NULL;
 287
 288                         if (__asprintf (&buf, _("\
 289 rcmd: write (setting up stderr): %m\n")) >= 0)
 290                           {
 291 #ifdef USE_IN_LIBIO
 292                             if (_IO_fwide (stderr, 0) > 0)
 293                               __fwprintf(stderr, L"%s", buf);
 294                             else
 295 #endif
 296                               fputs (buf, stderr);
 297                             free (buf);
 298                           }
 299                         (void)__close(s2);
 300                         goto bad;
 301                 }
 302                 pfd[0].fd = s;
 303                 pfd[1].fd = s2;
 304                 __set_errno (0);
 305                 if (__poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
 306                         char *buf = NULL;
 307
 308                         if ((errno != 0
 309                              && __asprintf(&buf, _("\
 310 rcmd: poll (setting up stderr): %m\n")) >= 0)
 311                             || (errno == 0
 312                                 && __asprintf(&buf, _("\
 313 poll: protocol failure in circuit setup\n")) >= 0))
 314                           {
 315 #ifdef USE_IN_LIBIO
 316                             if (_IO_fwide (stderr, 0) > 0)
 317                               __fwprintf (stderr, L"%s", buf);
 318                             else
 319 #endif
 320                               fputs (buf, stderr);
 321                             free  (buf);
 322                           }
 323                         (void)__close(s2);
 324                         goto bad;
 325                 }
 326                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 327                 switch (from.ss_family) {
 328                 case AF_INET:
 329                         rport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 330                         break;
 331                 case AF_INET6:
 332                         rport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 333                         break;
 334                 default:
 335                         rport = 0;
 336                         break;
 337                 }
 338                 (void)__close(s2);
 339                 if (s3 < 0) {
 340 #ifdef USE_IN_LIBIO
 341                         if (_IO_fwide (stderr, 0) > 0)
 342                                 (void)__fwprintf(stderr,
 343                                                  L"rcmd: accept: %m\n");
 344                         else
 345 #endif
 346                                 (void)fprintf(stderr,
 347                                               "rcmd: accept: %m\n");
 348                         lport = 0;
 349                         goto bad;
 350                 }
 351                 *fd2p = s3;
 352
 353                 if (rport >= IPPORT_RESERVED || rport < IPPORT_RESERVED / 2){
 354                         char *buf = NULL;
 355
 356                         if (__asprintf(&buf, _("\
 357 socket: protocol failure in circuit setup\n")) >= 0)
 358                           {
 359 #ifdef USE_IN_LIBIO
 360                             if (_IO_fwide (stderr, 0) > 0)
 361                               __fwprintf (stderr, L"%s", buf);
 362                             else
 363 #endif
 364                               fputs (buf, stderr);
 365                             free (buf);
 366                           }
 367                         goto bad2;
 368                 }
 369         }
 370         (void)__write(s, locuser, strlen(locuser)+1);
 371         (void)__write(s, remuser, strlen(remuser)+1);
 372         (void)__write(s, cmd, strlen(cmd)+1);
 373         n = __read(s, &c, 1);
 374         if (n != 1) {
 375                 char *buf = NULL;
 376
 377                 if ((n == 0
 378                      && __asprintf(&buf, _("rcmd: %s: short read"),
 379                                    *ahost) >= 0)
 380                     || (n != 0
 381                         && __asprintf(&buf, "rcmd: %s: %m\n", *ahost) >= 0))
 382                   {
 383 #ifdef USE_IN_LIBIO
 384                     if (_IO_fwide (stderr, 0) > 0)
 385                       __fwprintf (stderr, L"%s", buf);
 386                     else
 387 #endif
 388                       fputs (buf, stderr);
 389                     free (buf);
 390                   }
 391                 goto bad2;
 392         }
 393         if (c != 0) {
 394                 while (__read(s, &c, 1) == 1) {
 395                         (void)__write(STDERR_FILENO, &c, 1);
 396                         if (c == '\n')
 397                                 break;
 398                 }
 399                 goto bad2;
 400         }
 401         __sigsetmask(oldmask);
 402         freeaddrinfo(res);
 403         return s;
 404 bad2:
 405         if (lport)
 406                 (void)__close(*fd2p);
 407 bad:
 408         (void)__close(s);
 409         __sigsetmask(oldmask);
 410         freeaddrinfo(res);
 411         return -1;
 412 }
 413 libc_hidden_def (rcmd_af)
 414
 415 int
 416 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 417         char **ahost;
 418         u_short rport;
 419         const char *locuser, *remuser, *cmd;
 420         int *fd2p;
 421 {
 422   return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 423 }
 424
 425 int
 426 rresvport_af(alport, family)
 427         int *alport;
 428         sa_family_t family;
 429 {
 430         struct sockaddr_storage ss;
 431         int s;
 432         size_t len;
 433         uint16_t *sport;
 434
 435         switch(family){
 436         case AF_INET:
 437                 len = sizeof(struct sockaddr_in);
 438                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 439                 break;
 440         case AF_INET6:
 441                 len = sizeof(struct sockaddr_in6);
 442                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 443                 break;
 444         default:
 445                 __set_errno (EAFNOSUPPORT);
 446                 return -1;
 447         }
 448         s = __socket(family, SOCK_STREAM, 0);
 449         if (s < 0)
 450                 return -1;
 451
 452         memset (&ss, '\0', sizeof(ss));
 453 #ifdef SALEN
 454         ss.__ss_len = len;
 455 #endif
 456         ss.ss_family = family;
 457
 458         for (;;) {
 459                 *sport = htons((uint16_t) *alport);
 460                 if (__bind(s, (struct sockaddr *)&ss, len) >= 0)
 461                         return s;
 462                 if (errno != EADDRINUSE) {
 463                         (void)__close(s);
 464                         return -1;
 465                 }
 466                 (*alport)--;
 467                 if (*alport == IPPORT_RESERVED/2)
 468                         break;
 469         }
 470         (void)__close(s);
 471         __set_errno (EAGAIN);
 472         return -1;
 473 }
 474 libc_hidden_def (rresvport_af)
 475
 476 int
 477 rresvport(alport)
 478         int *alport;
 479 {
 480         return rresvport_af(alport, AF_INET);
 481 }
 482
 483 int     __check_rhosts_file = 1;
 484 char    *__rcmd_errstr;
 485
 486 int
 487 ruserok_af(rhost, superuser, ruser, luser, af)
 488         const char *rhost, *ruser, *luser;
 489         int superuser;
 490         sa_family_t af;
 491 {
 492         struct addrinfo hints, *res, *res0;
 493         int gai;
 494         int ret;
 495
 496         memset (&hints, '\0', sizeof(hints));
 497         hints.ai_family = af;
 498         gai = getaddrinfo(rhost, NULL, &hints, &res0);
 499         if (gai)
 500                 return -1;
 501         ret = -1;
 502         for (res=res0; res; res=res->ai_next)
 503                 if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
 504                                 superuser, ruser, luser, rhost) == 0){
 505                         ret = 0;
 506                         break;
 507                 }
 508         freeaddrinfo(res0);
 509         return (ret);
 510 }
 511 libc_hidden_def (ruserok_af)
 512
 513 int
 514 ruserok(rhost, superuser, ruser, luser)
 515         const char *rhost, *ruser, *luser;
 516         int superuser;
 517 {
 518         return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
 519 }
 520
 521 /* Extremely paranoid file open function. */
 522 static FILE *
 523 iruserfopen (const char *file, uid_t okuser)
 524 {
 525   struct stat64 st;
 526   char *cp = NULL;
 527   FILE *res = NULL;
 528
 529   /* If not a regular file, if owned by someone other than user or
 530      root, if writeable by anyone but the owner, or if hardlinked
 531      anywhere, quit.  */
 532   cp = NULL;
 533   if (__lxstat64 (_STAT_VER, file, &st))
 534     cp = _("lstat failed");
 535   else if (!S_ISREG (st.st_mode))
 536     cp = _("not regular file");
 537   else
 538     {
 539       res = fopen (file, "r");
 540       if (!res)
 541         cp = _("cannot open");
 542       else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
 543         cp = _("fstat failed");
 544       else if (st.st_uid && st.st_uid != okuser)
 545         cp = _("bad owner");
 546       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 547         cp = _("writeable by other than owner");
 548       else if (st.st_nlink > 1)
 549         cp = _("hard linked somewhere");
 550     }
 551
 552   /* If there were any problems, quit.  */
 553   if (cp != NULL)
 554     {
 555       __rcmd_errstr = cp;
 556       if (res)
 557         fclose (res);
 558       return NULL;
 559     }
 560
 561   /* No threads use this stream.  */
 562   __fsetlocking (res, FSETLOCKING_BYCALLER);
 563
 564   return res;
 565 }
 566
 567 /*
 568  * New .rhosts strategy: We are passed an ip address. We spin through
 569  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 570  * has ip addresses, we don't have to trust a nameserver.  When it
 571  * contains hostnames, we spin through the list of addresses the nameserver
 572  * gives us and look for a match.
 573  *
 574  * Returns 0 if ok, -1 if not ok.
 575  */
 576 static int
 577 ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
 578      struct sockaddr *ra;
 579      size_t ralen;
 580      int superuser;
 581      const char *ruser, *luser, *rhost;
 582 {
 583   FILE *hostf = NULL;
 584   int isbad = -1;
 585
 586   if (!superuser)
 587     hostf = iruserfopen (_PATH_HEQUIV, 0);
 588
 589   if (hostf)
 590     {
 591       isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 592       fclose (hostf);
 593
 594       if (!isbad)
 595         return 0;
 596     }
 597
 598   if (__check_rhosts_file || superuser)
 599     {
 600       char *pbuf;
 601       struct passwd pwdbuf, *pwd;
 602       size_t dirlen;
 603       size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
 604       char *buffer = __alloca (buflen);
 605       uid_t uid;
 606
 607       if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
 608           || pwd == NULL)
 609         return -1;
 610
 611       dirlen = strlen (pwd->pw_dir);
 612       pbuf = alloca (dirlen + sizeof "/.rhosts");
 613       __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
 614                  "/.rhosts", sizeof "/.rhosts");
 615
 616        /* Change effective uid while reading .rhosts.  If root and
 617           reading an NFS mounted file system, can't read files that
 618           are protected read/write owner only.  */
 619        uid = __geteuid ();
 620        seteuid (pwd->pw_uid);
 621        hostf = iruserfopen (pbuf, pwd->pw_uid);
 622
 623        if (hostf != NULL)
 624          {
 625            isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 626            fclose (hostf);
 627          }
 628
 629        seteuid (uid);
 630        return isbad;
 631     }
 632   return -1;
 633 }
 634 /*
 635  * ruserok_sa() is now discussed on ipng, so
 636  * currently disabled for external use
 637  */
 638 static int ruserok_sa(ra, ralen, superuser, ruser, luser)
 639      struct sockaddr *ra;
 640      size_t ralen;
 641      int superuser;
 642      const char *ruser, *luser;
 643 {
 644   return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
 645 }
 646
 647 /* This is the exported version.  */
 648 int
 649 iruserok_af (raddr, superuser, ruser, luser, af)
 650      const void *raddr;
 651      int superuser;
 652      const char *ruser, *luser;
 653      sa_family_t af;
 654 {
 655   struct sockaddr_storage ra;
 656   size_t ralen;
 657
 658   memset (&ra, '\0', sizeof(ra));
 659   switch (af){
 660   case AF_INET:
 661     ((struct sockaddr_in *)&ra)->sin_family = AF_INET;
 662     memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr,
 663             sizeof(struct in_addr));
 664     ralen = sizeof(struct sockaddr_in);
 665     break;
 666   case AF_INET6:
 667     ((struct sockaddr_in6 *)&ra)->sin6_family = AF_INET6;
 668     memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr,
 669             sizeof(struct in6_addr));
 670     ralen = sizeof(struct sockaddr_in6);
 671     break;
 672   default:
 673     return 0;
 674   }
 675   return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser);
 676 }
 677 libc_hidden_def (iruserok_af)
 678
 679 int
 680 iruserok (raddr, superuser, ruser, luser)
 681      u_int32_t raddr;
 682      int superuser;
 683      const char *ruser, *luser;
 684 {
 685   return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
 686 }
 687
 688 /*
 689  * XXX
 690  * Don't make static, used by lpd(8).
 691  *
 692  * This function is not used anymore. It is only present because lpd(8)
 693  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 694  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 695  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 696  * or PAM.
 697  * Returns 0 if ok, -1 if not ok.
 698  */
 699 int
 700 __ivaliduser(hostf, raddr, luser, ruser)
 701         FILE *hostf;
 702         u_int32_t raddr;
 703         const char *luser, *ruser;
 704 {
 705         struct sockaddr_in ra;
 706         memset(&ra, '\0', sizeof(ra));
 707         ra.sin_family = AF_INET;
 708         ra.sin_addr.s_addr = raddr;
 709         return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
 710                                luser, ruser, "-");
 711 }
 712
 713
 714 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 715 static int
 716 internal_function
 717 __checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
 718                 const char *rhost)
 719 {
 720         struct addrinfo hints, *res0, *res;
 721         char raddr[INET6_ADDRSTRLEN];
 722         int match;
 723         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 724
 725         /* Check nis netgroup.  */
 726         if (strncmp ("+@", lhost, 2) == 0)
 727                 return innetgr (&lhost[2], rhost, NULL, NULL);
 728
 729         if (strncmp ("-@", lhost, 2) == 0)
 730                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 731
 732         /* -host */
 733         if (strncmp ("-", lhost,1) == 0) {
 734                 negate = -1;
 735                 lhost++;
 736         } else if (strcmp ("+",lhost) == 0) {
 737                 return 1;                    /* asking for trouble, but ok.. */
 738         }
 739
 740         /* Try for raw ip address first. */
 741         /* XXX */
 742         if (getnameinfo(ra, ralen,
 743                         raddr, sizeof(raddr), NULL, 0,
 744                         NI_NUMERICHOST) == 0
 745             && strcmp(raddr, lhost) == 0)
 746                 return negate;
 747
 748         /* Better be a hostname. */
 749         match = 0;
 750         memset(&hints, '\0', sizeof(hints));
 751         hints.ai_family = ra->sa_family;
 752         if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
 753                 /* Spin through ip addresses. */
 754                 for (res = res0; res; res = res->ai_next)
 755                   {
 756                     if (res->ai_family == ra->sa_family
 757                         && !memcmp(res->ai_addr, ra, res->ai_addrlen))
 758                       {
 759                         match = 1;
 760                         break;
 761                       }
 762                   }
 763                 freeaddrinfo (res0);
 764         }
 765         return negate * match;
 766 }
 767
 768 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 769 static int
 770 internal_function
 771 __icheckuser (const char *luser, const char *ruser)
 772 {
 773     /*
 774       luser is user entry from .rhosts/hosts.equiv file
 775       ruser is user id on remote host
 776       */
 777
 778     /* [-+]@netgroup */
 779     if (strncmp ("+@", luser, 2) == 0)
 780         return innetgr (&luser[2], NULL, ruser, NULL);
 781
 782     if (strncmp ("-@", luser,2) == 0)
 783         return -innetgr (&luser[2], NULL, ruser, NULL);
 784
 785     /* -user */
 786     if (strncmp ("-", luser, 1) == 0)
 787         return -(strcmp (&luser[1], ruser) == 0);
 788
 789     /* + */
 790     if (strcmp ("+", luser) == 0)
 791         return 1;
 792
 793     /* simple string match */
 794     return strcmp (ruser, luser) == 0;
 795 }
 796
 797 /*
 798  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 799  */
 800 static int
 801 __isempty (char *p)
 802 {
 803     while (*p && isspace (*p)) {
 804         ++p;
 805     }
 806
 807     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 808 }
 809
 810 /*
 811  * Returns 0 if positive match, -1 if _not_ ok.
 812  */
 813 static int
 814 __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
 815         FILE *hostf;
 816         struct sockaddr *ra;
 817         size_t ralen;
 818         const char *luser, *ruser, *rhost;
 819 {
 820     register const char *user;
 821     register char *p;
 822     int hcheck, ucheck;
 823     char *buf = NULL;
 824     size_t bufsize = 0;
 825     int retval = -1;
 826
 827     while (__getline (&buf, &bufsize, hostf) > 0) {
 828         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 829         p = buf;
 830
 831         /* Skip empty or comment lines */
 832         if (__isempty (p)) {
 833             continue;
 834         }
 835
 836         /* Skip lines that are too long. */
 837         if (strchr (p, '\n') == NULL) {
 838             int ch = getc_unlocked (hostf);
 839
 840             while (ch != '\n' && ch != EOF)
 841                 ch = getc_unlocked (hostf);
 842             continue;
 843         }
 844
 845         for (;*p && !isspace(*p); ++p) {
 846             *p = _tolower (*p);
 847         }
 848
 849         /* Next we want to find the permitted name for the remote user.  */
 850         if (*p == ' ' || *p == '\t') {
 851             /* <nul> terminate hostname and skip spaces */
 852             for (*p++='\0'; *p && isspace (*p); ++p);
 853
 854             user = p;                   /* this is the user's name */
 855             while (*p && !isspace (*p))
 856                 ++p;                    /* find end of user's name */
 857         } else
 858             user = p;
 859
 860         *p = '\0';              /* <nul> terminate username (+host?) */
 861
 862         /* buf -> host(?) ; user -> username(?) */
 863
 864         /* First check host part */
 865         hcheck = __checkhost_sa (ra, ralen, buf, rhost);
 866
 867         if (hcheck < 0)
 868             break;
 869
 870         if (hcheck) {
 871             /* Then check user part */
 872             if (! (*user))
 873                 user = luser;
 874
 875             ucheck = __icheckuser (user, ruser);
 876
 877             /* Positive 'host user' match? */
 878             if (ucheck > 0) {
 879                 retval = 0;
 880                 break;
 881             }
 882
 883             /* Negative 'host -user' match? */
 884             if (ucheck < 0)
 885                 break;
 886
 887             /* Neither, go on looking for match */
 888         }
 889     }
 890
 891     if (buf != NULL)
 892       free (buf);
 893
 894     return retval;
 895 }