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 #include <sys/uio.h>
  87
  88
  89 int __ivaliduser (FILE *, u_int32_t, const char *, const char *);
  90 static int __validuser2_sa (FILE *, struct sockaddr *, size_t,
  91                             const char *, const char *, const char *);
  92 static int ruserok2_sa (struct sockaddr *ra, size_t ralen,
  93                         int superuser, const char *ruser,
  94                         const char *luser, const char *rhost);
  95 static int ruserok_sa (struct sockaddr *ra, size_t ralen,
  96                         int superuser, const char *ruser,
  97                         const char *luser);
  98 int iruserok_af (const void *raddr, int superuser, const char *ruser,
  99                  const char *luser, sa_family_t af);
 100 int iruserok (u_int32_t raddr, int superuser, const char *ruser,
 101               const char *luser);
 102
 103 libc_hidden_proto (iruserok_af)
 104
 105 libc_freeres_ptr(static char *ahostbuf);
 106
 107 int
 108 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
 109         char **ahost;
 110         u_short rport;
 111         const char *locuser, *remuser, *cmd;
 112         int *fd2p;
 113         sa_family_t af;
 114 {
 115         char paddr[INET6_ADDRSTRLEN];
 116         struct addrinfo hints, *res, *ai;
 117         struct sockaddr_storage from;
 118         struct pollfd pfd[2];
 119         int32_t oldmask;
 120         pid_t pid;
 121         int s, lport, timo, error;
 122         char c;
 123         int refused;
 124         char num[8];
 125         ssize_t n;
 126
 127         if (af != AF_INET && af != AF_INET6 && af != AF_UNSPEC)
 128           {
 129             __set_errno (EAFNOSUPPORT);
 130             return -1;
 131           }
 132
 133         pid = __getpid();
 134
 135         memset(&hints, '\0', sizeof(hints));
 136         hints.ai_flags = AI_CANONNAME;
 137         hints.ai_family = af;
 138         hints.ai_socktype = SOCK_STREAM;
 139         (void)__snprintf(num, sizeof(num), "%d", ntohs(rport));
 140         error = getaddrinfo(*ahost, num, &hints, &res);
 141         if (error) {
 142 #ifdef USE_IN_LIBIO
 143                 if (_IO_fwide (stderr, 0) > 0)
 144                         __fwprintf(stderr, L"rcmd: getaddrinfo: %s\n",
 145                                    gai_strerror(error));
 146                 else
 147 #endif
 148                         fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 149                                 gai_strerror(error));
 150                 return (-1);
 151         }
 152
 153         pfd[0].events = POLLIN;
 154         pfd[1].events = POLLIN;
 155
 156         if (res->ai_canonname){
 157                 free (ahostbuf);
 158                 ahostbuf = strdup (res->ai_canonname);
 159                 if (ahostbuf == NULL) {
 160 #ifdef USE_IN_LIBIO
 161                         if (_IO_fwide (stderr, 0) > 0)
 162                                 __fwprintf(stderr, L"%s",
 163                                            _("rcmd: Cannot allocate memory\n"));
 164                         else
 165 #endif
 166                                 fputs(_("rcmd: Cannot allocate memory\n"),
 167                                       stderr);
 168                         return (-1);
 169                 }
 170                 *ahost = ahostbuf;
 171         } else
 172                 *ahost = NULL;
 173         ai = res;
 174         refused = 0;
 175         oldmask = __sigblock(sigmask(SIGURG));
 176         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 177                 char errbuf[200];
 178
 179                 s = rresvport_af(&lport, ai->ai_family);
 180                 if (s < 0) {
 181                         if (errno == EAGAIN) {
 182 #ifdef USE_IN_LIBIO
 183                                 if (_IO_fwide (stderr, 0) > 0)
 184                                         __fwprintf(stderr, L"%s",
 185                                                    _("rcmd: socket: All ports in use\n"));
 186                                 else
 187 #endif
 188                                         fputs(_("rcmd: socket: All ports in use\n"),
 189                                               stderr);
 190                         } else {
 191 #ifdef USE_IN_LIBIO
 192                                 if (_IO_fwide (stderr, 0) > 0)
 193                                         __fwprintf(stderr,
 194                                                    L"rcmd: socket: %m\n");
 195                                 else
 196 #endif
 197                                         fprintf(stderr, "rcmd: socket: %m\n");
 198                         }
 199                         __sigsetmask(oldmask);
 200                         freeaddrinfo(res);
 201                         return -1;
 202                 }
 203                 __fcntl(s, F_SETOWN, pid);
 204                 if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 205                         break;
 206                 (void)__close(s);
 207                 if (errno == EADDRINUSE) {
 208                         lport--;
 209                         continue;
 210                 }
 211                 if (errno == ECONNREFUSED)
 212                         refused = 1;
 213                 if (ai->ai_next != NULL) {
 214                         int oerrno = errno;
 215                         char *buf = NULL;
 216
 217                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 218                                     paddr, sizeof(paddr),
 219                                     NULL, 0,
 220                                     NI_NUMERICHOST);
 221
 222                         if (__asprintf (&buf, _("connect to address %s: "),
 223                                         paddr) >= 0)
 224                           {
 225 #ifdef USE_IN_LIBIO
 226                             if (_IO_fwide (stderr, 0) > 0)
 227                               __fwprintf(stderr, L"%s", buf);
 228                             else
 229 #endif
 230                               fputs (buf, stderr);
 231                             free (buf);
 232                           }
 233                         __set_errno (oerrno);
 234                         perror(0);
 235                         ai = ai->ai_next;
 236                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 237                                     paddr, sizeof(paddr),
 238                                     NULL, 0,
 239                                     NI_NUMERICHOST);
 240                         if (__asprintf (&buf, _("Trying %s...\n"), paddr) >= 0)
 241                           {
 242 #ifdef USE_IN_LIBIO
 243                             if (_IO_fwide (stderr, 0) > 0)
 244                               __fwprintf (stderr, L"%s", buf);
 245                             else
 246 #endif
 247                               fputs (buf, stderr);
 248                             free (buf);
 249                           }
 250                         continue;
 251                 }
 252                 if (refused && timo <= 16) {
 253                         (void)__sleep(timo);
 254                         timo *= 2;
 255                         ai = res;
 256                         refused = 0;
 257                         continue;
 258                 }
 259                 freeaddrinfo(res);
 260 #ifdef USE_IN_LIBIO
 261                 if (_IO_fwide (stderr, 0) > 0)
 262                         (void)__fwprintf(stderr, L"%s: %s\n", *ahost,
 263                                          __strerror_r(errno,
 264                                                       errbuf, sizeof (errbuf)));
 265                 else
 266 #endif
 267                         (void)fprintf(stderr, "%s: %s\n", *ahost,
 268                                       __strerror_r(errno,
 269                                                    errbuf, sizeof (errbuf)));
 270                 __sigsetmask(oldmask);
 271                 return -1;
 272         }
 273         lport--;
 274         if (fd2p == 0) {
 275                 __write(s, "", 1);
 276                 lport = 0;
 277         } else {
 278                 char num[8];
 279                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 280                 socklen_t len = ai->ai_addrlen;
 281
 282                 if (s2 < 0)
 283                         goto bad;
 284                 __listen(s2, 1);
 285                 (void)__snprintf(num, sizeof(num), "%d", lport);
 286                 if (__write(s, num, strlen(num)+1) != (ssize_t)strlen(num)+1) {
 287                         char *buf = NULL;
 288
 289                         if (__asprintf (&buf, _("\
 290 rcmd: write (setting up stderr): %m\n")) >= 0)
 291                           {
 292 #ifdef USE_IN_LIBIO
 293                             if (_IO_fwide (stderr, 0) > 0)
 294                               __fwprintf(stderr, L"%s", buf);
 295                             else
 296 #endif
 297                               fputs (buf, stderr);
 298                             free (buf);
 299                           }
 300                         (void)__close(s2);
 301                         goto bad;
 302                 }
 303                 pfd[0].fd = s;
 304                 pfd[1].fd = s2;
 305                 __set_errno (0);
 306                 if (__poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
 307                         char *buf = NULL;
 308
 309                         if ((errno != 0
 310                              && __asprintf(&buf, _("\
 311 rcmd: poll (setting up stderr): %m\n")) >= 0)
 312                             || (errno == 0
 313                                 && __asprintf(&buf, _("\
 314 poll: protocol failure in circuit setup\n")) >= 0))
 315                           {
 316 #ifdef USE_IN_LIBIO
 317                             if (_IO_fwide (stderr, 0) > 0)
 318                               __fwprintf (stderr, L"%s", buf);
 319                             else
 320 #endif
 321                               fputs (buf, stderr);
 322                             free  (buf);
 323                           }
 324                         (void)__close(s2);
 325                         goto bad;
 326                 }
 327                 s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from,
 328                                                 &len));
 329                 switch (from.ss_family) {
 330                 case AF_INET:
 331                         rport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 332                         break;
 333                 case AF_INET6:
 334                         rport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 335                         break;
 336                 default:
 337                         rport = 0;
 338                         break;
 339                 }
 340                 (void)__close(s2);
 341                 if (s3 < 0) {
 342 #ifdef USE_IN_LIBIO
 343                         if (_IO_fwide (stderr, 0) > 0)
 344                                 (void)__fwprintf(stderr,
 345                                                  L"rcmd: accept: %m\n");
 346                         else
 347 #endif
 348                                 (void)fprintf(stderr,
 349                                               "rcmd: accept: %m\n");
 350                         lport = 0;
 351                         goto bad;
 352                 }
 353                 *fd2p = s3;
 354
 355                 if (rport >= IPPORT_RESERVED || rport < IPPORT_RESERVED / 2){
 356                         char *buf = NULL;
 357
 358                         if (__asprintf(&buf, _("\
 359 socket: protocol failure in circuit setup\n")) >= 0)
 360                           {
 361 #ifdef USE_IN_LIBIO
 362                             if (_IO_fwide (stderr, 0) > 0)
 363                               __fwprintf (stderr, L"%s", buf);
 364                             else
 365 #endif
 366                               fputs (buf, stderr);
 367                             free (buf);
 368                           }
 369                         goto bad2;
 370                 }
 371         }
 372         struct iovec iov[3] =
 373           {
 374             [0] = { .iov_base = (void *) locuser,
 375                     .iov_len = strlen (locuser) + 1 },
 376             [1] = { .iov_base = (void *) remuser,
 377                     .iov_len = strlen (remuser) + 1 },
 378             [2] = { .iov_base = (void *) cmd,
 379                     .iov_len = strlen (cmd) + 1 }
 380           };
 381         (void) TEMP_FAILURE_RETRY (__writev (s, iov, 3));
 382         n = TEMP_FAILURE_RETRY (__read(s, &c, 1));
 383         if (n != 1) {
 384                 char *buf = NULL;
 385
 386                 if ((n == 0
 387                      && __asprintf(&buf, _("rcmd: %s: short read"),
 388                                    *ahost) >= 0)
 389                     || (n != 0
 390                         && __asprintf(&buf, "rcmd: %s: %m\n", *ahost) >= 0))
 391                   {
 392 #ifdef USE_IN_LIBIO
 393                     if (_IO_fwide (stderr, 0) > 0)
 394                       __fwprintf (stderr, L"%s", buf);
 395                     else
 396 #endif
 397                       fputs (buf, stderr);
 398                     free (buf);
 399                   }
 400                 goto bad2;
 401         }
 402         if (c != 0) {
 403                 while (__read(s, &c, 1) == 1) {
 404                         (void)__write(STDERR_FILENO, &c, 1);
 405                         if (c == '\n')
 406                                 break;
 407                 }
 408                 goto bad2;
 409         }
 410         __sigsetmask(oldmask);
 411         freeaddrinfo(res);
 412         return s;
 413 bad2:
 414         if (lport)
 415                 (void)__close(*fd2p);
 416 bad:
 417         (void)__close(s);
 418         __sigsetmask(oldmask);
 419         freeaddrinfo(res);
 420         return -1;
 421 }
 422 libc_hidden_def (rcmd_af)
 423
 424 int
 425 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 426         char **ahost;
 427         u_short rport;
 428         const char *locuser, *remuser, *cmd;
 429         int *fd2p;
 430 {
 431   return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 432 }
 433
 434 int
 435 rresvport_af(alport, family)
 436         int *alport;
 437         sa_family_t family;
 438 {
 439         struct sockaddr_storage ss;
 440         int s;
 441         size_t len;
 442         uint16_t *sport;
 443
 444         switch(family){
 445         case AF_INET:
 446                 len = sizeof(struct sockaddr_in);
 447                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 448                 break;
 449         case AF_INET6:
 450                 len = sizeof(struct sockaddr_in6);
 451                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 452                 break;
 453         default:
 454                 __set_errno (EAFNOSUPPORT);
 455                 return -1;
 456         }
 457         s = __socket(family, SOCK_STREAM, 0);
 458         if (s < 0)
 459                 return -1;
 460
 461         memset (&ss, '\0', sizeof(ss));
 462 #ifdef SALEN
 463         ss.__ss_len = len;
 464 #endif
 465         ss.ss_family = family;
 466
 467         /* Ignore invalid values.  */
 468         if (*alport < IPPORT_RESERVED / 2)
 469                 *alport = IPPORT_RESERVED / 2;
 470         else if (*alport >= IPPORT_RESERVED)
 471                 *alport = IPPORT_RESERVED - 1;
 472
 473         int start = *alport;
 474         do {
 475                 *sport = htons((uint16_t) *alport);
 476                 if (__bind(s, (struct sockaddr *)&ss, len) >= 0)
 477                         return s;
 478                 if (errno != EADDRINUSE) {
 479                         (void)__close(s);
 480                         return -1;
 481                 }
 482                 if ((*alport)-- == IPPORT_RESERVED/2)
 483                         *alport = IPPORT_RESERVED - 1;
 484         } while (*alport != start);
 485         (void)__close(s);
 486         __set_errno (EAGAIN);
 487         return -1;
 488 }
 489 libc_hidden_def (rresvport_af)
 490
 491 int
 492 rresvport(alport)
 493         int *alport;
 494 {
 495         return rresvport_af(alport, AF_INET);
 496 }
 497
 498 int     __check_rhosts_file = 1;
 499 char    *__rcmd_errstr;
 500
 501 int
 502 ruserok_af(rhost, superuser, ruser, luser, af)
 503         const char *rhost, *ruser, *luser;
 504         int superuser;
 505         sa_family_t af;
 506 {
 507         struct addrinfo hints, *res, *res0;
 508         int gai;
 509         int ret;
 510
 511         memset (&hints, '\0', sizeof(hints));
 512         hints.ai_family = af;
 513         gai = getaddrinfo(rhost, NULL, &hints, &res0);
 514         if (gai)
 515                 return -1;
 516         ret = -1;
 517         for (res=res0; res; res=res->ai_next)
 518                 if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
 519                                 superuser, ruser, luser, rhost) == 0){
 520                         ret = 0;
 521                         break;
 522                 }
 523         freeaddrinfo(res0);
 524         return (ret);
 525 }
 526 libc_hidden_def (ruserok_af)
 527
 528 int
 529 ruserok(rhost, superuser, ruser, luser)
 530         const char *rhost, *ruser, *luser;
 531         int superuser;
 532 {
 533         return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
 534 }
 535
 536 /* Extremely paranoid file open function. */
 537 static FILE *
 538 iruserfopen (const char *file, uid_t okuser)
 539 {
 540   struct stat64 st;
 541   char *cp = NULL;
 542   FILE *res = NULL;
 543
 544   /* If not a regular file, if owned by someone other than user or
 545      root, if writeable by anyone but the owner, or if hardlinked
 546      anywhere, quit.  */
 547   cp = NULL;
 548   if (__lxstat64 (_STAT_VER, file, &st))
 549     cp = _("lstat failed");
 550   else if (!S_ISREG (st.st_mode))
 551     cp = _("not regular file");
 552   else
 553     {
 554       res = fopen (file, "r");
 555       if (!res)
 556         cp = _("cannot open");
 557       else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
 558         cp = _("fstat failed");
 559       else if (st.st_uid && st.st_uid != okuser)
 560         cp = _("bad owner");
 561       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 562         cp = _("writeable by other than owner");
 563       else if (st.st_nlink > 1)
 564         cp = _("hard linked somewhere");
 565     }
 566
 567   /* If there were any problems, quit.  */
 568   if (cp != NULL)
 569     {
 570       __rcmd_errstr = cp;
 571       if (res)
 572         fclose (res);
 573       return NULL;
 574     }
 575
 576   /* No threads use this stream.  */
 577   __fsetlocking (res, FSETLOCKING_BYCALLER);
 578
 579   return res;
 580 }
 581
 582 /*
 583  * New .rhosts strategy: We are passed an ip address. We spin through
 584  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 585  * has ip addresses, we don't have to trust a nameserver.  When it
 586  * contains hostnames, we spin through the list of addresses the nameserver
 587  * gives us and look for a match.
 588  *
 589  * Returns 0 if ok, -1 if not ok.
 590  */
 591 static int
 592 ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
 593      struct sockaddr *ra;
 594      size_t ralen;
 595      int superuser;
 596      const char *ruser, *luser, *rhost;
 597 {
 598   FILE *hostf = NULL;
 599   int isbad = -1;
 600
 601   if (!superuser)
 602     hostf = iruserfopen (_PATH_HEQUIV, 0);
 603
 604   if (hostf)
 605     {
 606       isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 607       fclose (hostf);
 608
 609       if (!isbad)
 610         return 0;
 611     }
 612
 613   if (__check_rhosts_file || superuser)
 614     {
 615       char *pbuf;
 616       struct passwd pwdbuf, *pwd;
 617       size_t dirlen;
 618       size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
 619       char *buffer = __alloca (buflen);
 620       uid_t uid;
 621
 622       if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
 623           || pwd == NULL)
 624         return -1;
 625
 626       dirlen = strlen (pwd->pw_dir);
 627       pbuf = alloca (dirlen + sizeof "/.rhosts");
 628       __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
 629                  "/.rhosts", sizeof "/.rhosts");
 630
 631        /* Change effective uid while reading .rhosts.  If root and
 632           reading an NFS mounted file system, can't read files that
 633           are protected read/write owner only.  */
 634        uid = __geteuid ();
 635        seteuid (pwd->pw_uid);
 636        hostf = iruserfopen (pbuf, pwd->pw_uid);
 637
 638        if (hostf != NULL)
 639          {
 640            isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 641            fclose (hostf);
 642          }
 643
 644        seteuid (uid);
 645        return isbad;
 646     }
 647   return -1;
 648 }
 649 /*
 650  * ruserok_sa() is now discussed on ipng, so
 651  * currently disabled for external use
 652  */
 653 static int ruserok_sa(ra, ralen, superuser, ruser, luser)
 654      struct sockaddr *ra;
 655      size_t ralen;
 656      int superuser;
 657      const char *ruser, *luser;
 658 {
 659   return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
 660 }
 661
 662 /* This is the exported version.  */
 663 int
 664 iruserok_af (raddr, superuser, ruser, luser, af)
 665      const void *raddr;
 666      int superuser;
 667      const char *ruser, *luser;
 668      sa_family_t af;
 669 {
 670   struct sockaddr_storage ra;
 671   size_t ralen;
 672
 673   memset (&ra, '\0', sizeof(ra));
 674   switch (af){
 675   case AF_INET:
 676     ((struct sockaddr_in *)&ra)->sin_family = AF_INET;
 677     memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr,
 678             sizeof(struct in_addr));
 679     ralen = sizeof(struct sockaddr_in);
 680     break;
 681   case AF_INET6:
 682     ((struct sockaddr_in6 *)&ra)->sin6_family = AF_INET6;
 683     memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr,
 684             sizeof(struct in6_addr));
 685     ralen = sizeof(struct sockaddr_in6);
 686     break;
 687   default:
 688     return 0;
 689   }
 690   return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser);
 691 }
 692 libc_hidden_def (iruserok_af)
 693
 694 int
 695 iruserok (raddr, superuser, ruser, luser)
 696      u_int32_t raddr;
 697      int superuser;
 698      const char *ruser, *luser;
 699 {
 700   return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
 701 }
 702
 703 /*
 704  * XXX
 705  * Don't make static, used by lpd(8).
 706  *
 707  * This function is not used anymore. It is only present because lpd(8)
 708  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 709  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 710  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 711  * or PAM.
 712  * Returns 0 if ok, -1 if not ok.
 713  */
 714 int
 715 __ivaliduser(hostf, raddr, luser, ruser)
 716         FILE *hostf;
 717         u_int32_t raddr;
 718         const char *luser, *ruser;
 719 {
 720         struct sockaddr_in ra;
 721         memset(&ra, '\0', sizeof(ra));
 722         ra.sin_family = AF_INET;
 723         ra.sin_addr.s_addr = raddr;
 724         return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
 725                                luser, ruser, "-");
 726 }
 727
 728
 729 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 730 static int
 731 internal_function
 732 __checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
 733                 const char *rhost)
 734 {
 735         struct addrinfo hints, *res0, *res;
 736         char raddr[INET6_ADDRSTRLEN];
 737         int match;
 738         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 739
 740         /* Check nis netgroup.  */
 741         if (strncmp ("+@", lhost, 2) == 0)
 742                 return innetgr (&lhost[2], rhost, NULL, NULL);
 743
 744         if (strncmp ("-@", lhost, 2) == 0)
 745                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 746
 747         /* -host */
 748         if (strncmp ("-", lhost,1) == 0) {
 749                 negate = -1;
 750                 lhost++;
 751         } else if (strcmp ("+",lhost) == 0) {
 752                 return 1;                    /* asking for trouble, but ok.. */
 753         }
 754
 755         /* Try for raw ip address first. */
 756         /* XXX */
 757         if (getnameinfo(ra, ralen,
 758                         raddr, sizeof(raddr), NULL, 0,
 759                         NI_NUMERICHOST) == 0
 760             && strcmp(raddr, lhost) == 0)
 761                 return negate;
 762
 763         /* Better be a hostname. */
 764         match = 0;
 765         memset(&hints, '\0', sizeof(hints));
 766         hints.ai_family = ra->sa_family;
 767         if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
 768                 /* Spin through ip addresses. */
 769                 for (res = res0; res; res = res->ai_next)
 770                   {
 771                     if (res->ai_family == ra->sa_family
 772                         && !memcmp(res->ai_addr, ra, res->ai_addrlen))
 773                       {
 774                         match = 1;
 775                         break;
 776                       }
 777                   }
 778                 freeaddrinfo (res0);
 779         }
 780         return negate * match;
 781 }
 782
 783 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 784 static int
 785 internal_function
 786 __icheckuser (const char *luser, const char *ruser)
 787 {
 788     /*
 789       luser is user entry from .rhosts/hosts.equiv file
 790       ruser is user id on remote host
 791       */
 792
 793     /* [-+]@netgroup */
 794     if (strncmp ("+@", luser, 2) == 0)
 795         return innetgr (&luser[2], NULL, ruser, NULL);
 796
 797     if (strncmp ("-@", luser,2) == 0)
 798         return -innetgr (&luser[2], NULL, ruser, NULL);
 799
 800     /* -user */
 801     if (strncmp ("-", luser, 1) == 0)
 802         return -(strcmp (&luser[1], ruser) == 0);
 803
 804     /* + */
 805     if (strcmp ("+", luser) == 0)
 806         return 1;
 807
 808     /* simple string match */
 809     return strcmp (ruser, luser) == 0;
 810 }
 811
 812 /*
 813  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 814  */
 815 static int
 816 __isempty (char *p)
 817 {
 818     while (*p && isspace (*p)) {
 819         ++p;
 820     }
 821
 822     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 823 }
 824
 825 /*
 826  * Returns 0 if positive match, -1 if _not_ ok.
 827  */
 828 static int
 829 __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
 830         FILE *hostf;
 831         struct sockaddr *ra;
 832         size_t ralen;
 833         const char *luser, *ruser, *rhost;
 834 {
 835     register const char *user;
 836     register char *p;
 837     int hcheck, ucheck;
 838     char *buf = NULL;
 839     size_t bufsize = 0;
 840     int retval = -1;
 841
 842     while (__getline (&buf, &bufsize, hostf) > 0) {
 843         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 844         p = buf;
 845
 846         /* Skip empty or comment lines */
 847         if (__isempty (p)) {
 848             continue;
 849         }
 850
 851         /* Skip lines that are too long. */
 852         if (strchr (p, '\n') == NULL) {
 853             int ch = getc_unlocked (hostf);
 854
 855             while (ch != '\n' && ch != EOF)
 856                 ch = getc_unlocked (hostf);
 857             continue;
 858         }
 859
 860         for (;*p && !isspace(*p); ++p) {
 861             *p = _tolower (*p);
 862         }
 863
 864         /* Next we want to find the permitted name for the remote user.  */
 865         if (*p == ' ' || *p == '\t') {
 866             /* <nul> terminate hostname and skip spaces */
 867             for (*p++='\0'; *p && isspace (*p); ++p);
 868
 869             user = p;                   /* this is the user's name */
 870             while (*p && !isspace (*p))
 871                 ++p;                    /* find end of user's name */
 872         } else
 873             user = p;
 874
 875         *p = '\0';              /* <nul> terminate username (+host?) */
 876
 877         /* buf -> host(?) ; user -> username(?) */
 878
 879         /* First check host part */
 880         hcheck = __checkhost_sa (ra, ralen, buf, rhost);
 881
 882         if (hcheck < 0)
 883             break;
 884
 885         if (hcheck) {
 886             /* Then check user part */
 887             if (! (*user))
 888                 user = luser;
 889
 890             ucheck = __icheckuser (user, ruser);
 891
 892             /* Positive 'host user' match? */
 893             if (ucheck > 0) {
 894                 retval = 0;
 895                 break;
 896             }
 897
 898             /* Negative 'host -user' match? */
 899             if (ucheck < 0)
 900                 break;
 901
 902             /* Neither, go on looking for match */
 903         }
 904     }
 905
 906     if (buf != NULL)
 907       free (buf);
 908
 909     return retval;
 910 }