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         union
 116         {
 117           struct sockaddr sa;
 118           struct sockaddr_storage ss;
 119           struct sockaddr_in sin;
 120           struct sockaddr_in6 sin6;
 121         } from;
 122         struct pollfd pfd[2];
 123         int32_t oldmask;
 124         pid_t pid;
 125         int s, lport, timo, error;
 126         char c;
 127         int refused;
 128         char num[8];
 129         ssize_t n;
 130
 131         if (af != AF_INET && af != AF_INET6 && af != AF_UNSPEC)
 132           {
 133             __set_errno (EAFNOSUPPORT);
 134             return -1;
 135           }
 136
 137         pid = __getpid();
 138
 139         memset(&hints, '\0', sizeof(hints));
 140         hints.ai_flags = AI_CANONNAME;
 141         hints.ai_family = af;
 142         hints.ai_socktype = SOCK_STREAM;
 143         (void)__snprintf(num, sizeof(num), "%d", ntohs(rport));
 144         error = getaddrinfo(*ahost, num, &hints, &res);
 145         if (error) {
 146                 if (error == EAI_NONAME && *ahost != NULL)
 147                         __fxprintf(NULL, "%s: Unknown host\n", *ahost);
 148                 else
 149                         __fxprintf(NULL, "rcmd: getaddrinfo: %s\n",
 150                                    gai_strerror(error));
 151
 152                 return -1;
 153         }
 154
 155         pfd[0].events = POLLIN;
 156         pfd[1].events = POLLIN;
 157
 158         if (res->ai_canonname){
 159                 free (ahostbuf);
 160                 ahostbuf = strdup (res->ai_canonname);
 161                 if (ahostbuf == NULL) {
 162                         __fxprintf(NULL, "%s",
 163                                    _("rcmd: Cannot allocate memory\n"));
 164                         return -1;
 165                 }
 166                 *ahost = ahostbuf;
 167         } else
 168                 *ahost = NULL;
 169         ai = res;
 170         refused = 0;
 171         oldmask = __sigblock(sigmask(SIGURG));
 172         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 173                 char errbuf[200];
 174
 175                 s = rresvport_af(&lport, ai->ai_family);
 176                 if (s < 0) {
 177                         if (errno == EAGAIN)
 178                                 __fxprintf(NULL, "%s", _("\
 179 rcmd: socket: All ports in use\n"));
 180                         else
 181                                 __fxprintf(NULL, "rcmd: socket: %m\n");
 182
 183                         __sigsetmask(oldmask);
 184                         freeaddrinfo(res);
 185                         return -1;
 186                 }
 187                 __fcntl(s, F_SETOWN, pid);
 188                 if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 189                         break;
 190                 (void)__close(s);
 191                 if (errno == EADDRINUSE) {
 192                         lport--;
 193                         continue;
 194                 }
 195                 if (errno == ECONNREFUSED)
 196                         refused = 1;
 197                 if (ai->ai_next != NULL) {
 198                         int oerrno = errno;
 199                         char *buf = NULL;
 200
 201                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 202                                     paddr, sizeof(paddr),
 203                                     NULL, 0,
 204                                     NI_NUMERICHOST);
 205
 206                         if (__asprintf (&buf, _("connect to address %s: "),
 207                                         paddr) >= 0)
 208                           {
 209                             __fxprintf(NULL, "%s", buf);
 210                             free (buf);
 211                           }
 212                         __set_errno (oerrno);
 213                         perror(0);
 214                         ai = ai->ai_next;
 215                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 216                                     paddr, sizeof(paddr),
 217                                     NULL, 0,
 218                                     NI_NUMERICHOST);
 219                         if (__asprintf (&buf, _("Trying %s...\n"), paddr) >= 0)
 220                           {
 221                             __fxprintf (NULL, "%s", buf);
 222                             free (buf);
 223                           }
 224                         continue;
 225                 }
 226                 if (refused && timo <= 16) {
 227                         (void)__sleep(timo);
 228                         timo *= 2;
 229                         ai = res;
 230                         refused = 0;
 231                         continue;
 232                 }
 233                 freeaddrinfo(res);
 234                 (void)__fxprintf(NULL, "%s: %s\n", *ahost,
 235                                  __strerror_r(errno, errbuf, sizeof (errbuf)));
 236                 __sigsetmask(oldmask);
 237                 return -1;
 238         }
 239         lport--;
 240         if (fd2p == 0) {
 241                 __write(s, "", 1);
 242                 lport = 0;
 243         } else {
 244                 char num[8];
 245                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 246                 socklen_t len = ai->ai_addrlen;
 247
 248                 if (s2 < 0)
 249                         goto bad;
 250                 __listen(s2, 1);
 251                 (void)__snprintf(num, sizeof(num), "%d", lport);
 252                 if (__write(s, num, strlen(num)+1) != (ssize_t)strlen(num)+1) {
 253                         char *buf = NULL;
 254
 255                         if (__asprintf (&buf, _("\
 256 rcmd: write (setting up stderr): %m\n")) >= 0)
 257                           {
 258                             __fxprintf(NULL, "%s", buf);
 259                             free (buf);
 260                           }
 261                         (void)__close(s2);
 262                         goto bad;
 263                 }
 264                 pfd[0].fd = s;
 265                 pfd[1].fd = s2;
 266                 __set_errno (0);
 267                 if (__poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
 268                         char *buf = NULL;
 269
 270                         if ((errno != 0
 271                              && __asprintf(&buf, _("\
 272 rcmd: poll (setting up stderr): %m\n")) >= 0)
 273                             || (errno == 0
 274                                 && __asprintf(&buf, _("\
 275 poll: protocol failure in circuit setup\n")) >= 0))
 276                           {
 277                             __fxprintf (NULL, "%s", buf);
 278                             free  (buf);
 279                           }
 280                         (void)__close(s2);
 281                         goto bad;
 282                 }
 283                 s3 = TEMP_FAILURE_RETRY (accept(s2, &from.sa, &len));
 284                 switch (from.sa.sa_family) {
 285                 case AF_INET:
 286                         rport = ntohs(from.sin.sin_port);
 287                         break;
 288                 case AF_INET6:
 289                         rport = ntohs(from.sin6.sin6_port);
 290                         break;
 291                 default:
 292                         rport = 0;
 293                         break;
 294                 }
 295                 (void)__close(s2);
 296                 if (s3 < 0) {
 297                         (void)__fxprintf(NULL, "rcmd: accept: %m\n");
 298                         lport = 0;
 299                         goto bad;
 300                 }
 301                 *fd2p = s3;
 302
 303                 if (rport >= IPPORT_RESERVED || rport < IPPORT_RESERVED / 2){
 304                         char *buf = NULL;
 305
 306                         if (__asprintf(&buf, _("\
 307 socket: protocol failure in circuit setup\n")) >= 0)
 308                           {
 309                             __fxprintf (NULL, "%s", buf);
 310                             free (buf);
 311                           }
 312                         goto bad2;
 313                 }
 314         }
 315         struct iovec iov[3] =
 316           {
 317             [0] = { .iov_base = (void *) locuser,
 318                     .iov_len = strlen (locuser) + 1 },
 319             [1] = { .iov_base = (void *) remuser,
 320                     .iov_len = strlen (remuser) + 1 },
 321             [2] = { .iov_base = (void *) cmd,
 322                     .iov_len = strlen (cmd) + 1 }
 323           };
 324         (void) TEMP_FAILURE_RETRY (__writev (s, iov, 3));
 325         n = TEMP_FAILURE_RETRY (__read(s, &c, 1));
 326         if (n != 1) {
 327                 char *buf = NULL;
 328
 329                 if ((n == 0
 330                      && __asprintf(&buf, _("rcmd: %s: short read"),
 331                                    *ahost) >= 0)
 332                     || (n != 0
 333                         && __asprintf(&buf, "rcmd: %s: %m\n", *ahost) >= 0))
 334                   {
 335                     __fxprintf (NULL, "%s", buf);
 336                     free (buf);
 337                   }
 338                 goto bad2;
 339         }
 340         if (c != 0) {
 341                 while (__read(s, &c, 1) == 1) {
 342                         (void)__write(STDERR_FILENO, &c, 1);
 343                         if (c == '\n')
 344                                 break;
 345                 }
 346                 goto bad2;
 347         }
 348         __sigsetmask(oldmask);
 349         freeaddrinfo(res);
 350         return s;
 351 bad2:
 352         if (lport)
 353                 (void)__close(*fd2p);
 354 bad:
 355         (void)__close(s);
 356         __sigsetmask(oldmask);
 357         freeaddrinfo(res);
 358         return -1;
 359 }
 360 libc_hidden_def (rcmd_af)
 361
 362 int
 363 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 364         char **ahost;
 365         u_short rport;
 366         const char *locuser, *remuser, *cmd;
 367         int *fd2p;
 368 {
 369   return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 370 }
 371
 372 int
 373 rresvport_af(alport, family)
 374         int *alport;
 375         sa_family_t family;
 376 {
 377         struct sockaddr_storage ss;
 378         int s;
 379         size_t len;
 380         uint16_t *sport;
 381
 382         switch(family){
 383         case AF_INET:
 384                 len = sizeof(struct sockaddr_in);
 385                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 386                 break;
 387         case AF_INET6:
 388                 len = sizeof(struct sockaddr_in6);
 389                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 390                 break;
 391         default:
 392                 __set_errno (EAFNOSUPPORT);
 393                 return -1;
 394         }
 395         s = __socket(family, SOCK_STREAM, 0);
 396         if (s < 0)
 397                 return -1;
 398
 399         memset (&ss, '\0', sizeof(ss));
 400 #ifdef SALEN
 401         ss.__ss_len = len;
 402 #endif
 403         ss.ss_family = family;
 404
 405         /* Ignore invalid values.  */
 406         if (*alport < IPPORT_RESERVED / 2)
 407                 *alport = IPPORT_RESERVED / 2;
 408         else if (*alport >= IPPORT_RESERVED)
 409                 *alport = IPPORT_RESERVED - 1;
 410
 411         int start = *alport;
 412         do {
 413                 *sport = htons((uint16_t) *alport);
 414                 if (__bind(s, (struct sockaddr *)&ss, len) >= 0)
 415                         return s;
 416                 if (errno != EADDRINUSE) {
 417                         (void)__close(s);
 418                         return -1;
 419                 }
 420                 if ((*alport)-- == IPPORT_RESERVED/2)
 421                         *alport = IPPORT_RESERVED - 1;
 422         } while (*alport != start);
 423         (void)__close(s);
 424         __set_errno (EAGAIN);
 425         return -1;
 426 }
 427 libc_hidden_def (rresvport_af)
 428
 429 int
 430 rresvport(alport)
 431         int *alport;
 432 {
 433         return rresvport_af(alport, AF_INET);
 434 }
 435
 436 int     __check_rhosts_file = 1;
 437 char    *__rcmd_errstr;
 438
 439 int
 440 ruserok_af(rhost, superuser, ruser, luser, af)
 441         const char *rhost, *ruser, *luser;
 442         int superuser;
 443         sa_family_t af;
 444 {
 445         struct addrinfo hints, *res, *res0;
 446         int gai;
 447         int ret;
 448
 449         memset (&hints, '\0', sizeof(hints));
 450         hints.ai_family = af;
 451         gai = getaddrinfo(rhost, NULL, &hints, &res0);
 452         if (gai)
 453                 return -1;
 454         ret = -1;
 455         for (res=res0; res; res=res->ai_next)
 456                 if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
 457                                 superuser, ruser, luser, rhost) == 0){
 458                         ret = 0;
 459                         break;
 460                 }
 461         freeaddrinfo(res0);
 462         return (ret);
 463 }
 464 libc_hidden_def (ruserok_af)
 465
 466 int
 467 ruserok(rhost, superuser, ruser, luser)
 468         const char *rhost, *ruser, *luser;
 469         int superuser;
 470 {
 471         return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
 472 }
 473
 474 /* Extremely paranoid file open function. */
 475 static FILE *
 476 iruserfopen (const char *file, uid_t okuser)
 477 {
 478   struct stat64 st;
 479   char *cp = NULL;
 480   FILE *res = NULL;
 481
 482   /* If not a regular file, if owned by someone other than user or
 483      root, if writeable by anyone but the owner, or if hardlinked
 484      anywhere, quit.  */
 485   if (__lxstat64 (_STAT_VER, file, &st))
 486     cp = _("lstat failed");
 487   else if (!S_ISREG (st.st_mode))
 488     cp = _("not regular file");
 489   else
 490     {
 491       res = fopen (file, "rce");
 492       if (!res)
 493         cp = _("cannot open");
 494       else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
 495         cp = _("fstat failed");
 496       else if (st.st_uid && st.st_uid != okuser)
 497         cp = _("bad owner");
 498       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 499         cp = _("writeable by other than owner");
 500       else if (st.st_nlink > 1)
 501         cp = _("hard linked somewhere");
 502     }
 503
 504   /* If there were any problems, quit.  */
 505   if (cp != NULL)
 506     {
 507       __rcmd_errstr = cp;
 508       if (res)
 509         fclose (res);
 510       return NULL;
 511     }
 512
 513   /* No threads use this stream.  */
 514   __fsetlocking (res, FSETLOCKING_BYCALLER);
 515
 516   return res;
 517 }
 518
 519 /*
 520  * New .rhosts strategy: We are passed an ip address. We spin through
 521  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 522  * has ip addresses, we don't have to trust a nameserver.  When it
 523  * contains hostnames, we spin through the list of addresses the nameserver
 524  * gives us and look for a match.
 525  *
 526  * Returns 0 if ok, -1 if not ok.
 527  */
 528 static int
 529 ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
 530      struct sockaddr *ra;
 531      size_t ralen;
 532      int superuser;
 533      const char *ruser, *luser, *rhost;
 534 {
 535   FILE *hostf = NULL;
 536   int isbad = -1;
 537
 538   if (!superuser)
 539     hostf = iruserfopen (_PATH_HEQUIV, 0);
 540
 541   if (hostf)
 542     {
 543       isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 544       fclose (hostf);
 545
 546       if (!isbad)
 547         return 0;
 548     }
 549
 550   if (__check_rhosts_file || superuser)
 551     {
 552       char *pbuf;
 553       struct passwd pwdbuf, *pwd;
 554       size_t dirlen;
 555       size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
 556       char *buffer = __alloca (buflen);
 557       uid_t uid;
 558
 559       if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
 560           || pwd == NULL)
 561         return -1;
 562
 563       dirlen = strlen (pwd->pw_dir);
 564       pbuf = alloca (dirlen + sizeof "/.rhosts");
 565       __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
 566                  "/.rhosts", sizeof "/.rhosts");
 567
 568        /* Change effective uid while reading .rhosts.  If root and
 569           reading an NFS mounted file system, can't read files that
 570           are protected read/write owner only.  */
 571        uid = __geteuid ();
 572        seteuid (pwd->pw_uid);
 573        hostf = iruserfopen (pbuf, pwd->pw_uid);
 574
 575        if (hostf != NULL)
 576          {
 577            isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 578            fclose (hostf);
 579          }
 580
 581        seteuid (uid);
 582        return isbad;
 583     }
 584   return -1;
 585 }
 586 /*
 587  * ruserok_sa() is now discussed on ipng, so
 588  * currently disabled for external use
 589  */
 590 static int ruserok_sa(ra, ralen, superuser, ruser, luser)
 591      struct sockaddr *ra;
 592      size_t ralen;
 593      int superuser;
 594      const char *ruser, *luser;
 595 {
 596   return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
 597 }
 598
 599 /* This is the exported version.  */
 600 int
 601 iruserok_af (raddr, superuser, ruser, luser, af)
 602      const void *raddr;
 603      int superuser;
 604      const char *ruser, *luser;
 605      sa_family_t af;
 606 {
 607   struct sockaddr_storage ra;
 608   size_t ralen;
 609
 610   memset (&ra, '\0', sizeof(ra));
 611   switch (af){
 612   case AF_INET:
 613     ra.ss_family = AF_INET;
 614     memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr,
 615             sizeof(struct in_addr));
 616     ralen = sizeof(struct sockaddr_in);
 617     break;
 618   case AF_INET6:
 619     ra.ss_family = AF_INET6;
 620     memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr,
 621             sizeof(struct in6_addr));
 622     ralen = sizeof(struct sockaddr_in6);
 623     break;
 624   default:
 625     return 0;
 626   }
 627   return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser);
 628 }
 629 libc_hidden_def (iruserok_af)
 630
 631 int
 632 iruserok (raddr, superuser, ruser, luser)
 633      u_int32_t raddr;
 634      int superuser;
 635      const char *ruser, *luser;
 636 {
 637   return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
 638 }
 639
 640 /*
 641  * XXX
 642  * Don't make static, used by lpd(8).
 643  *
 644  * This function is not used anymore. It is only present because lpd(8)
 645  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 646  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 647  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 648  * or PAM.
 649  * Returns 0 if ok, -1 if not ok.
 650  */
 651 int
 652 __ivaliduser(hostf, raddr, luser, ruser)
 653         FILE *hostf;
 654         u_int32_t raddr;
 655         const char *luser, *ruser;
 656 {
 657         struct sockaddr_in ra;
 658         memset(&ra, '\0', sizeof(ra));
 659         ra.sin_family = AF_INET;
 660         ra.sin_addr.s_addr = raddr;
 661         return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
 662                                luser, ruser, "-");
 663 }
 664
 665
 666 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 667 static int
 668 internal_function
 669 __checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
 670                 const char *rhost)
 671 {
 672         struct addrinfo hints, *res0, *res;
 673         char raddr[INET6_ADDRSTRLEN];
 674         int match;
 675         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 676
 677         /* Check nis netgroup.  */
 678         if (strncmp ("+@", lhost, 2) == 0)
 679                 return innetgr (&lhost[2], rhost, NULL, NULL);
 680
 681         if (strncmp ("-@", lhost, 2) == 0)
 682                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 683
 684         /* -host */
 685         if (strncmp ("-", lhost,1) == 0) {
 686                 negate = -1;
 687                 lhost++;
 688         } else if (strcmp ("+",lhost) == 0) {
 689                 return 1;                    /* asking for trouble, but ok.. */
 690         }
 691
 692         /* Try for raw ip address first. */
 693         /* XXX */
 694         if (getnameinfo(ra, ralen,
 695                         raddr, sizeof(raddr), NULL, 0,
 696                         NI_NUMERICHOST) == 0
 697             && strcmp(raddr, lhost) == 0)
 698                 return negate;
 699
 700         /* Better be a hostname. */
 701         match = 0;
 702         memset(&hints, '\0', sizeof(hints));
 703         hints.ai_family = ra->sa_family;
 704         if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
 705                 /* Spin through ip addresses. */
 706                 for (res = res0; res; res = res->ai_next)
 707                   {
 708                     if (res->ai_family == ra->sa_family
 709                         && !memcmp(res->ai_addr, ra, res->ai_addrlen))
 710                       {
 711                         match = 1;
 712                         break;
 713                       }
 714                   }
 715                 freeaddrinfo (res0);
 716         }
 717         return negate * match;
 718 }
 719
 720 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 721 static int
 722 internal_function
 723 __icheckuser (const char *luser, const char *ruser)
 724 {
 725     /*
 726       luser is user entry from .rhosts/hosts.equiv file
 727       ruser is user id on remote host
 728       */
 729
 730     /* [-+]@netgroup */
 731     if (strncmp ("+@", luser, 2) == 0)
 732         return innetgr (&luser[2], NULL, ruser, NULL);
 733
 734     if (strncmp ("-@", luser,2) == 0)
 735         return -innetgr (&luser[2], NULL, ruser, NULL);
 736
 737     /* -user */
 738     if (strncmp ("-", luser, 1) == 0)
 739         return -(strcmp (&luser[1], ruser) == 0);
 740
 741     /* + */
 742     if (strcmp ("+", luser) == 0)
 743         return 1;
 744
 745     /* simple string match */
 746     return strcmp (ruser, luser) == 0;
 747 }
 748
 749 /*
 750  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 751  */
 752 static int
 753 __isempty (char *p)
 754 {
 755     while (*p && isspace (*p)) {
 756         ++p;
 757     }
 758
 759     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 760 }
 761
 762 /*
 763  * Returns 0 if positive match, -1 if _not_ ok.
 764  */
 765 static int
 766 __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
 767         FILE *hostf;
 768         struct sockaddr *ra;
 769         size_t ralen;
 770         const char *luser, *ruser, *rhost;
 771 {
 772     register const char *user;
 773     register char *p;
 774     int hcheck, ucheck;
 775     char *buf = NULL;
 776     size_t bufsize = 0;
 777     int retval = -1;
 778
 779     while (__getline (&buf, &bufsize, hostf) > 0) {
 780         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 781         p = buf;
 782
 783         /* Skip empty or comment lines */
 784         if (__isempty (p)) {
 785             continue;
 786         }
 787
 788         for (;*p && !isspace(*p); ++p) {
 789             *p = _tolower (*p);
 790         }
 791
 792         /* Next we want to find the permitted name for the remote user.  */
 793         if (*p == ' ' || *p == '\t') {
 794             /* <nul> terminate hostname and skip spaces */
 795             for (*p++='\0'; *p && isspace (*p); ++p);
 796
 797             user = p;                   /* this is the user's name */
 798             while (*p && !isspace (*p))
 799                 ++p;                    /* find end of user's name */
 800         } else
 801             user = p;
 802
 803         *p = '\0';              /* <nul> terminate username (+host?) */
 804
 805         /* buf -> host(?) ; user -> username(?) */
 806
 807         /* First check host part */
 808         hcheck = __checkhost_sa (ra, ralen, buf, rhost);
 809
 810         if (hcheck < 0)
 811             break;
 812
 813         if (hcheck) {
 814             /* Then check user part */
 815             if (! (*user))
 816                 user = luser;
 817
 818             ucheck = __icheckuser (user, ruser);
 819
 820             /* Positive 'host user' match? */
 821             if (ucheck > 0) {
 822                 retval = 0;
 823                 break;
 824             }
 825
 826             /* Negative 'host -user' match? */
 827             if (ucheck < 0)
 828                 break;
 829
 830             /* Neither, go on looking for match */
 831         }
 832     }
 833
 834     free (buf);
 835
 836     return retval;
 837 }