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