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