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 libc_hidden_def (rcmd_af)
 402
 403 int
 404 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 405         char **ahost;
 406         u_short rport;
 407         const char *locuser, *remuser, *cmd;
 408         int *fd2p;
 409 {
 410   return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 411 }
 412
 413 int
 414 rresvport_af(alport, family)
 415         int *alport;
 416         sa_family_t family;
 417 {
 418         struct sockaddr_storage ss;
 419         int s;
 420         size_t len;
 421         uint16_t *sport;
 422
 423         switch(family){
 424         case AF_INET:
 425                 len = sizeof(struct sockaddr_in);
 426                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 427                 break;
 428         case AF_INET6:
 429                 len = sizeof(struct sockaddr_in6);
 430                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 431                 break;
 432         default:
 433                 __set_errno (EAFNOSUPPORT);
 434                 return -1;
 435         }
 436         s = __socket(family, SOCK_STREAM, 0);
 437         if (s < 0)
 438                 return -1;
 439
 440         memset (&ss, '\0', sizeof(ss));
 441 #ifdef SALEN
 442         ss.__ss_len = len;
 443 #endif
 444         ss.ss_family = family;
 445
 446         for (;;) {
 447                 *sport = htons((uint16_t) *alport);
 448                 if (__bind(s, (struct sockaddr *)&ss, len) >= 0)
 449                         return s;
 450                 if (errno != EADDRINUSE) {
 451                         (void)__close(s);
 452                         return -1;
 453                 }
 454                 (*alport)--;
 455                 if (*alport == IPPORT_RESERVED/2)
 456                         break;
 457         }
 458         (void)__close(s);
 459         __set_errno (EAGAIN);
 460         return -1;
 461 }
 462 libc_hidden_def (rresvport_af)
 463
 464 int
 465 rresvport(alport)
 466         int *alport;
 467 {
 468         return rresvport_af(alport, AF_INET);
 469 }
 470
 471 int     __check_rhosts_file = 1;
 472 char    *__rcmd_errstr;
 473
 474 int
 475 ruserok_af(rhost, superuser, ruser, luser, af)
 476         const char *rhost, *ruser, *luser;
 477         int superuser;
 478         sa_family_t af;
 479 {
 480         struct addrinfo hints, *res, *res0;
 481         int gai;
 482         int ret;
 483
 484         memset (&hints, '\0', sizeof(hints));
 485         hints.ai_family = af;
 486         gai = getaddrinfo(rhost, NULL, &hints, &res0);
 487         if (gai)
 488                 return -1;
 489         ret = -1;
 490         for (res=res0; res; res=res->ai_next)
 491                 if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
 492                                 superuser, ruser, luser, rhost) == 0){
 493                         ret = 0;
 494                         break;
 495                 }
 496         freeaddrinfo(res0);
 497         return (ret);
 498 }
 499 libc_hidden_def (ruserok_af)
 500
 501 int
 502 ruserok(rhost, superuser, ruser, luser)
 503         const char *rhost, *ruser, *luser;
 504         int superuser;
 505 {
 506         return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
 507 }
 508
 509 /* Extremely paranoid file open function. */
 510 static FILE *
 511 iruserfopen (const char *file, uid_t okuser)
 512 {
 513   struct stat64 st;
 514   char *cp = NULL;
 515   FILE *res = NULL;
 516
 517   /* If not a regular file, if owned by someone other than user or
 518      root, if writeable by anyone but the owner, or if hardlinked
 519      anywhere, quit.  */
 520   cp = NULL;
 521   if (__lxstat64 (_STAT_VER, file, &st))
 522     cp = _("lstat failed");
 523   else if (!S_ISREG (st.st_mode))
 524     cp = _("not regular file");
 525   else
 526     {
 527       res = fopen (file, "r");
 528       if (!res)
 529         cp = _("cannot open");
 530       else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
 531         cp = _("fstat failed");
 532       else if (st.st_uid && st.st_uid != okuser)
 533         cp = _("bad owner");
 534       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 535         cp = _("writeable by other than owner");
 536       else if (st.st_nlink > 1)
 537         cp = _("hard linked somewhere");
 538     }
 539
 540   /* If there were any problems, quit.  */
 541   if (cp != NULL)
 542     {
 543       __rcmd_errstr = cp;
 544       if (res)
 545         fclose (res);
 546       return NULL;
 547     }
 548
 549   /* No threads use this stream.  */
 550   __fsetlocking (res, FSETLOCKING_BYCALLER);
 551
 552   return res;
 553 }
 554
 555 /*
 556  * New .rhosts strategy: We are passed an ip address. We spin through
 557  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 558  * has ip addresses, we don't have to trust a nameserver.  When it
 559  * contains hostnames, we spin through the list of addresses the nameserver
 560  * gives us and look for a match.
 561  *
 562  * Returns 0 if ok, -1 if not ok.
 563  */
 564 static int
 565 ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
 566      struct sockaddr *ra;
 567      size_t ralen;
 568      int superuser;
 569      const char *ruser, *luser, *rhost;
 570 {
 571   FILE *hostf = NULL;
 572   int isbad = -1;
 573
 574   if (!superuser)
 575     hostf = iruserfopen (_PATH_HEQUIV, 0);
 576
 577   if (hostf)
 578     {
 579       isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 580       fclose (hostf);
 581
 582       if (!isbad)
 583         return 0;
 584     }
 585
 586   if (__check_rhosts_file || superuser)
 587     {
 588       char *pbuf;
 589       struct passwd pwdbuf, *pwd;
 590       size_t dirlen;
 591       size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
 592       char *buffer = __alloca (buflen);
 593       uid_t uid;
 594
 595       if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
 596           || pwd == NULL)
 597         return -1;
 598
 599       dirlen = strlen (pwd->pw_dir);
 600       pbuf = alloca (dirlen + sizeof "/.rhosts");
 601       __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
 602                  "/.rhosts", sizeof "/.rhosts");
 603
 604        /* Change effective uid while reading .rhosts.  If root and
 605           reading an NFS mounted file system, can't read files that
 606           are protected read/write owner only.  */
 607        uid = __geteuid ();
 608        seteuid (pwd->pw_uid);
 609        hostf = iruserfopen (pbuf, pwd->pw_uid);
 610
 611        if (hostf != NULL)
 612          {
 613            isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 614            fclose (hostf);
 615          }
 616
 617        seteuid (uid);
 618        return isbad;
 619     }
 620   return -1;
 621 }
 622 /*
 623  * ruserok_sa() is now discussed on ipng, so
 624  * currently disabled for external use
 625  */
 626 static int ruserok_sa(ra, ralen, superuser, ruser, luser)
 627      struct sockaddr *ra;
 628      size_t ralen;
 629      int superuser;
 630      const char *ruser, *luser;
 631 {
 632   return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
 633 }
 634
 635 /* This is the exported version.  */
 636 int
 637 iruserok_af (raddr, superuser, ruser, luser, af)
 638      const void *raddr;
 639      int superuser;
 640      const char *ruser, *luser;
 641      sa_family_t af;
 642 {
 643   struct sockaddr_storage ra;
 644   size_t ralen;
 645
 646   memset (&ra, '\0', sizeof(ra));
 647   switch (af){
 648   case AF_INET:
 649     ((struct sockaddr_in *)&ra)->sin_family = AF_INET;
 650     memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr,
 651             sizeof(struct in_addr));
 652     ralen = sizeof(struct sockaddr_in);
 653     break;
 654   case AF_INET6:
 655     ((struct sockaddr_in6 *)&ra)->sin6_family = AF_INET6;
 656     memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr,
 657             sizeof(struct in6_addr));
 658     ralen = sizeof(struct sockaddr_in6);
 659     break;
 660   default:
 661     return 0;
 662   }
 663   return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser);
 664 }
 665 int
 666 iruserok (raddr, superuser, ruser, luser)
 667      u_int32_t raddr;
 668      int superuser;
 669      const char *ruser, *luser;
 670 {
 671   return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
 672 }
 673
 674 /*
 675  * XXX
 676  * Don't make static, used by lpd(8).
 677  *
 678  * This function is not used anymore. It is only present because lpd(8)
 679  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 680  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 681  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 682  * or PAM.
 683  * Returns 0 if ok, -1 if not ok.
 684  */
 685 int
 686 __ivaliduser(hostf, raddr, luser, ruser)
 687         FILE *hostf;
 688         u_int32_t raddr;
 689         const char *luser, *ruser;
 690 {
 691         struct sockaddr_in ra;
 692         memset(&ra, '\0', sizeof(ra));
 693         ra.sin_family = AF_INET;
 694         ra.sin_addr.s_addr = raddr;
 695         return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
 696                                luser, ruser, "-");
 697 }
 698
 699
 700 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 701 static int
 702 internal_function
 703 __checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
 704                 const char *rhost)
 705 {
 706         struct addrinfo hints, *res0, *res;
 707         char raddr[INET6_ADDRSTRLEN];
 708         int match;
 709         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 710
 711         /* Check nis netgroup.  */
 712         if (strncmp ("+@", lhost, 2) == 0)
 713                 return innetgr (&lhost[2], rhost, NULL, NULL);
 714
 715         if (strncmp ("-@", lhost, 2) == 0)
 716                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 717
 718         /* -host */
 719         if (strncmp ("-", lhost,1) == 0) {
 720                 negate = -1;
 721                 lhost++;
 722         } else if (strcmp ("+",lhost) == 0) {
 723                 return 1;                    /* asking for trouble, but ok.. */
 724         }
 725
 726         /* Try for raw ip address first. */
 727         /* XXX */
 728         if (getnameinfo(ra, ralen,
 729                         raddr, sizeof(raddr), NULL, 0,
 730                         NI_NUMERICHOST) == 0
 731             && strcmp(raddr, lhost) == 0)
 732                 return negate;
 733
 734         /* Better be a hostname. */
 735         match = 0;
 736         memset(&hints, '\0', sizeof(hints));
 737         hints.ai_family = ra->sa_family;
 738         if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
 739                 /* Spin through ip addresses. */
 740                 for (res = res0; res; res = res->ai_next)
 741                   {
 742                     if (res->ai_family == ra->sa_family
 743                         && !memcmp(res->ai_addr, ra, res->ai_addrlen))
 744                       {
 745                         match = 1;
 746                         break;
 747                       }
 748                   }
 749                 freeaddrinfo (res0);
 750         }
 751         return negate * match;
 752 }
 753
 754 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 755 static int
 756 internal_function
 757 __icheckuser (const char *luser, const char *ruser)
 758 {
 759     /*
 760       luser is user entry from .rhosts/hosts.equiv file
 761       ruser is user id on remote host
 762       */
 763
 764     /* [-+]@netgroup */
 765     if (strncmp ("+@", luser, 2) == 0)
 766         return innetgr (&luser[2], NULL, ruser, NULL);
 767
 768     if (strncmp ("-@", luser,2) == 0)
 769         return -innetgr (&luser[2], NULL, ruser, NULL);
 770
 771     /* -user */
 772     if (strncmp ("-", luser, 1) == 0)
 773         return -(strcmp (&luser[1], ruser) == 0);
 774
 775     /* + */
 776     if (strcmp ("+", luser) == 0)
 777         return 1;
 778
 779     /* simple string match */
 780     return strcmp (ruser, luser) == 0;
 781 }
 782
 783 /*
 784  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 785  */
 786 static int
 787 __isempty (char *p)
 788 {
 789     while (*p && isspace (*p)) {
 790         ++p;
 791     }
 792
 793     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 794 }
 795
 796 /*
 797  * Returns 0 if positive match, -1 if _not_ ok.
 798  */
 799 static int
 800 __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
 801         FILE *hostf;
 802         struct sockaddr *ra;
 803         size_t ralen;
 804         const char *luser, *ruser, *rhost;
 805 {
 806     register const char *user;
 807     register char *p;
 808     int hcheck, ucheck;
 809     char *buf = NULL;
 810     size_t bufsize = 0;
 811     int retval = -1;
 812
 813     while (__getline (&buf, &bufsize, hostf) > 0) {
 814         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 815         p = buf;
 816
 817         /* Skip empty or comment lines */
 818         if (__isempty (p)) {
 819             continue;
 820         }
 821
 822         /* Skip lines that are too long. */
 823         if (strchr (p, '\n') == NULL) {
 824             int ch = getc_unlocked (hostf);
 825
 826             while (ch != '\n' && ch != EOF)
 827                 ch = getc_unlocked (hostf);
 828             continue;
 829         }
 830
 831         for (;*p && !isspace(*p); ++p) {
 832             *p = _tolower (*p);
 833         }
 834
 835         /* Next we want to find the permitted name for the remote user.  */
 836         if (*p == ' ' || *p == '\t') {
 837             /* <nul> terminate hostname and skip spaces */
 838             for (*p++='\0'; *p && isspace (*p); ++p);
 839
 840             user = p;                   /* this is the user's name */
 841             while (*p && !isspace (*p))
 842                 ++p;                    /* find end of user's name */
 843         } else
 844             user = p;
 845
 846         *p = '\0';              /* <nul> terminate username (+host?) */
 847
 848         /* buf -> host(?) ; user -> username(?) */
 849
 850         /* First check host part */
 851         hcheck = __checkhost_sa (ra, ralen, buf, rhost);
 852
 853         if (hcheck < 0)
 854             break;
 855
 856         if (hcheck) {
 857             /* Then check user part */
 858             if (! (*user))
 859                 user = luser;
 860
 861             ucheck = __icheckuser (user, ruser);
 862
 863             /* Positive 'host user' match? */
 864             if (ucheck > 0) {
 865                 retval = 0;
 866                 break;
 867             }
 868
 869             /* Negative 'host -user' match? */
 870             if (ucheck < 0)
 871                 break;
 872
 873             /* Neither, go on looking for match */
 874         }
 875     }
 876
 877     if (buf != NULL)
 878       free (buf);
 879
 880     return retval;
 881 }