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