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         union {
 378                 struct sockaddr generic;
 379                 struct sockaddr_in in;
 380                 struct sockaddr_in6 in6;
 381         } ss;
 382         int s;
 383         size_t len;
 384         uint16_t *sport;
 385
 386         switch(family){
 387         case AF_INET:
 388                 len = sizeof(struct sockaddr_in);
 389                 sport = &ss.in.sin_port;
 390                 break;
 391         case AF_INET6:
 392                 len = sizeof(struct sockaddr_in6);
 393                 sport = &ss.in6.sin6_port;
 394                 break;
 395         default:
 396                 __set_errno (EAFNOSUPPORT);
 397                 return -1;
 398         }
 399         s = __socket(family, SOCK_STREAM, 0);
 400         if (s < 0)
 401                 return -1;
 402
 403         memset (&ss, '\0', sizeof(ss));
 404 #ifdef SALEN
 405         ss.generic.__ss_len = len;
 406 #endif
 407         ss.generic.sa_family = family;
 408
 409         /* Ignore invalid values.  */
 410         if (*alport < IPPORT_RESERVED / 2)
 411                 *alport = IPPORT_RESERVED / 2;
 412         else if (*alport >= IPPORT_RESERVED)
 413                 *alport = IPPORT_RESERVED - 1;
 414
 415         int start = *alport;
 416         do {
 417                 *sport = htons((uint16_t) *alport);
 418                 if (__bind(s, &ss.generic, len) >= 0)
 419                         return s;
 420                 if (errno != EADDRINUSE) {
 421                         (void)__close(s);
 422                         return -1;
 423                 }
 424                 if ((*alport)-- == IPPORT_RESERVED/2)
 425                         *alport = IPPORT_RESERVED - 1;
 426         } while (*alport != start);
 427         (void)__close(s);
 428         __set_errno (EAGAIN);
 429         return -1;
 430 }
 431 libc_hidden_def (rresvport_af)
 432
 433 int
 434 rresvport(alport)
 435         int *alport;
 436 {
 437         return rresvport_af(alport, AF_INET);
 438 }
 439
 440 int     __check_rhosts_file = 1;
 441 char    *__rcmd_errstr;
 442
 443 int
 444 ruserok_af(rhost, superuser, ruser, luser, af)
 445         const char *rhost, *ruser, *luser;
 446         int superuser;
 447         sa_family_t af;
 448 {
 449         struct addrinfo hints, *res, *res0;
 450         int gai;
 451         int ret;
 452
 453         memset (&hints, '\0', sizeof(hints));
 454         hints.ai_family = af;
 455         gai = getaddrinfo(rhost, NULL, &hints, &res0);
 456         if (gai)
 457                 return -1;
 458         ret = -1;
 459         for (res=res0; res; res=res->ai_next)
 460                 if (ruserok2_sa(res->ai_addr, res->ai_addrlen,
 461                                 superuser, ruser, luser, rhost) == 0){
 462                         ret = 0;
 463                         break;
 464                 }
 465         freeaddrinfo(res0);
 466         return (ret);
 467 }
 468 libc_hidden_def (ruserok_af)
 469
 470 int
 471 ruserok(rhost, superuser, ruser, luser)
 472         const char *rhost, *ruser, *luser;
 473         int superuser;
 474 {
 475         return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
 476 }
 477
 478 /* Extremely paranoid file open function. */
 479 static FILE *
 480 iruserfopen (const char *file, uid_t okuser)
 481 {
 482   struct stat64 st;
 483   char *cp = NULL;
 484   FILE *res = NULL;
 485
 486   /* If not a regular file, if owned by someone other than user or
 487      root, if writeable by anyone but the owner, or if hardlinked
 488      anywhere, quit.  */
 489   if (__lxstat64 (_STAT_VER, file, &st))
 490     cp = _("lstat failed");
 491   else if (!S_ISREG (st.st_mode))
 492     cp = _("not regular file");
 493   else
 494     {
 495       res = fopen (file, "rce");
 496       if (!res)
 497         cp = _("cannot open");
 498       else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)
 499         cp = _("fstat failed");
 500       else if (st.st_uid && st.st_uid != okuser)
 501         cp = _("bad owner");
 502       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 503         cp = _("writeable by other than owner");
 504       else if (st.st_nlink > 1)
 505         cp = _("hard linked somewhere");
 506     }
 507
 508   /* If there were any problems, quit.  */
 509   if (cp != NULL)
 510     {
 511       __rcmd_errstr = cp;
 512       if (res)
 513         fclose (res);
 514       return NULL;
 515     }
 516
 517   /* No threads use this stream.  */
 518   __fsetlocking (res, FSETLOCKING_BYCALLER);
 519
 520   return res;
 521 }
 522
 523 /*
 524  * New .rhosts strategy: We are passed an ip address. We spin through
 525  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 526  * has ip addresses, we don't have to trust a nameserver.  When it
 527  * contains hostnames, we spin through the list of addresses the nameserver
 528  * gives us and look for a match.
 529  *
 530  * Returns 0 if ok, -1 if not ok.
 531  */
 532 static int
 533 ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)
 534      struct sockaddr *ra;
 535      size_t ralen;
 536      int superuser;
 537      const char *ruser, *luser, *rhost;
 538 {
 539   FILE *hostf = NULL;
 540   int isbad = -1;
 541
 542   if (!superuser)
 543     hostf = iruserfopen (_PATH_HEQUIV, 0);
 544
 545   if (hostf)
 546     {
 547       isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 548       fclose (hostf);
 549
 550       if (!isbad)
 551         return 0;
 552     }
 553
 554   if (__check_rhosts_file || superuser)
 555     {
 556       char *pbuf;
 557       struct passwd pwdbuf, *pwd;
 558       size_t dirlen;
 559       size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
 560       char *buffer = __alloca (buflen);
 561       uid_t uid;
 562
 563       if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0
 564           || pwd == NULL)
 565         return -1;
 566
 567       dirlen = strlen (pwd->pw_dir);
 568       pbuf = alloca (dirlen + sizeof "/.rhosts");
 569       __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),
 570                  "/.rhosts", sizeof "/.rhosts");
 571
 572        /* Change effective uid while reading .rhosts.  If root and
 573           reading an NFS mounted file system, can't read files that
 574           are protected read/write owner only.  */
 575        uid = __geteuid ();
 576        seteuid (pwd->pw_uid);
 577        hostf = iruserfopen (pbuf, pwd->pw_uid);
 578
 579        if (hostf != NULL)
 580          {
 581            isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);
 582            fclose (hostf);
 583          }
 584
 585        seteuid (uid);
 586        return isbad;
 587     }
 588   return -1;
 589 }
 590 /*
 591  * ruserok_sa() is now discussed on ipng, so
 592  * currently disabled for external use
 593  */
 594 static int ruserok_sa(ra, ralen, superuser, ruser, luser)
 595      struct sockaddr *ra;
 596      size_t ralen;
 597      int superuser;
 598      const char *ruser, *luser;
 599 {
 600   return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-");
 601 }
 602
 603 /* This is the exported version.  */
 604 int
 605 iruserok_af (raddr, superuser, ruser, luser, af)
 606      const void *raddr;
 607      int superuser;
 608      const char *ruser, *luser;
 609      sa_family_t af;
 610 {
 611   union {
 612     struct sockaddr generic;
 613     struct sockaddr_in in;
 614     struct sockaddr_in6 in6;
 615   } ra;
 616   size_t ralen;
 617
 618   memset (&ra, '\0', sizeof(ra));
 619   switch (af){
 620   case AF_INET:
 621     ra.in.sin_family = AF_INET;
 622     memcpy (&ra.in.sin_addr, raddr, sizeof(struct in_addr));
 623     ralen = sizeof(struct sockaddr_in);
 624     break;
 625   case AF_INET6:
 626     ra.in6.sin6_family = AF_INET6;
 627     memcpy (&ra.in6.sin6_addr, raddr, sizeof(struct in6_addr));
 628     ralen = sizeof(struct sockaddr_in6);
 629     break;
 630   default:
 631     return 0;
 632   }
 633   return ruserok_sa (&ra.generic, ralen, superuser, ruser, luser);
 634 }
 635 libc_hidden_def (iruserok_af)
 636
 637 int
 638 iruserok (raddr, superuser, ruser, luser)
 639      u_int32_t raddr;
 640      int superuser;
 641      const char *ruser, *luser;
 642 {
 643   return iruserok_af (&raddr, superuser, ruser, luser, AF_INET);
 644 }
 645
 646 /*
 647  * XXX
 648  * Don't make static, used by lpd(8).
 649  *
 650  * This function is not used anymore. It is only present because lpd(8)
 651  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 652  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 653  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 654  * or PAM.
 655  * Returns 0 if ok, -1 if not ok.
 656  */
 657 int
 658 __ivaliduser(hostf, raddr, luser, ruser)
 659         FILE *hostf;
 660         u_int32_t raddr;
 661         const char *luser, *ruser;
 662 {
 663         struct sockaddr_in ra;
 664         memset(&ra, '\0', sizeof(ra));
 665         ra.sin_family = AF_INET;
 666         ra.sin_addr.s_addr = raddr;
 667         return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra),
 668                                luser, ruser, "-");
 669 }
 670
 671
 672 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 673 static int
 674 internal_function
 675 __checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost,
 676                 const char *rhost)
 677 {
 678         struct addrinfo hints, *res0, *res;
 679         char raddr[INET6_ADDRSTRLEN];
 680         int match;
 681         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 682
 683         /* Check nis netgroup.  */
 684         if (strncmp ("+@", lhost, 2) == 0)
 685                 return innetgr (&lhost[2], rhost, NULL, NULL);
 686
 687         if (strncmp ("-@", lhost, 2) == 0)
 688                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 689
 690         /* -host */
 691         if (strncmp ("-", lhost,1) == 0) {
 692                 negate = -1;
 693                 lhost++;
 694         } else if (strcmp ("+",lhost) == 0) {
 695                 return 1;                    /* asking for trouble, but ok.. */
 696         }
 697
 698         /* Try for raw ip address first. */
 699         /* XXX */
 700         if (getnameinfo(ra, ralen,
 701                         raddr, sizeof(raddr), NULL, 0,
 702                         NI_NUMERICHOST) == 0
 703             && strcmp(raddr, lhost) == 0)
 704                 return negate;
 705
 706         /* Better be a hostname. */
 707         match = 0;
 708         memset(&hints, '\0', sizeof(hints));
 709         hints.ai_family = ra->sa_family;
 710         if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){
 711                 /* Spin through ip addresses. */
 712                 for (res = res0; res; res = res->ai_next)
 713                   {
 714                     if (res->ai_family == ra->sa_family
 715                         && !memcmp(res->ai_addr, ra, res->ai_addrlen))
 716                       {
 717                         match = 1;
 718                         break;
 719                       }
 720                   }
 721                 freeaddrinfo (res0);
 722         }
 723         return negate * match;
 724 }
 725
 726 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 727 static int
 728 internal_function
 729 __icheckuser (const char *luser, const char *ruser)
 730 {
 731     /*
 732       luser is user entry from .rhosts/hosts.equiv file
 733       ruser is user id on remote host
 734       */
 735
 736     /* [-+]@netgroup */
 737     if (strncmp ("+@", luser, 2) == 0)
 738         return innetgr (&luser[2], NULL, ruser, NULL);
 739
 740     if (strncmp ("-@", luser,2) == 0)
 741         return -innetgr (&luser[2], NULL, ruser, NULL);
 742
 743     /* -user */
 744     if (strncmp ("-", luser, 1) == 0)
 745         return -(strcmp (&luser[1], ruser) == 0);
 746
 747     /* + */
 748     if (strcmp ("+", luser) == 0)
 749         return 1;
 750
 751     /* simple string match */
 752     return strcmp (ruser, luser) == 0;
 753 }
 754
 755 /*
 756  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 757  */
 758 static int
 759 __isempty (char *p)
 760 {
 761     while (*p && isspace (*p)) {
 762         ++p;
 763     }
 764
 765     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 766 }
 767
 768 /*
 769  * Returns 0 if positive match, -1 if _not_ ok.
 770  */
 771 static int
 772 __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
 773         FILE *hostf;
 774         struct sockaddr *ra;
 775         size_t ralen;
 776         const char *luser, *ruser, *rhost;
 777 {
 778     const char *user;
 779     char *p;
 780     int hcheck, ucheck;
 781     char *buf = NULL;
 782     size_t bufsize = 0;
 783     int retval = -1;
 784
 785     while (__getline (&buf, &bufsize, hostf) > 0) {
 786         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 787         p = buf;
 788
 789         /* Skip empty or comment lines */
 790         if (__isempty (p)) {
 791             continue;
 792         }
 793
 794         for (;*p && !isspace(*p); ++p) {
 795             *p = _tolower (*p);
 796         }
 797
 798         /* Next we want to find the permitted name for the remote user.  */
 799         if (*p == ' ' || *p == '\t') {
 800             /* <nul> terminate hostname and skip spaces */
 801             for (*p++='\0'; *p && isspace (*p); ++p);
 802
 803             user = p;                   /* this is the user's name */
 804             while (*p && !isspace (*p))
 805                 ++p;                    /* find end of user's name */
 806         } else
 807             user = p;
 808
 809         *p = '\0';              /* <nul> terminate username (+host?) */
 810
 811         /* buf -> host(?) ; user -> username(?) */
 812
 813         /* First check host part */
 814         hcheck = __checkhost_sa (ra, ralen, buf, rhost);
 815
 816         if (hcheck < 0)
 817             break;
 818
 819         if (hcheck) {
 820             /* Then check user part */
 821             if (! (*user))
 822                 user = luser;
 823
 824             ucheck = __icheckuser (user, ruser);
 825
 826             /* Positive 'host user' match? */
 827             if (ucheck > 0) {
 828                 retval = 0;
 829                 break;
 830             }
 831
 832             /* Negative 'host -user' match? */
 833             if (ucheck < 0)
 834                 break;
 835
 836             /* Neither, go on looking for match */
 837         }
 838     }
 839
 840     free (buf);
 841
 842     return retval;
 843 }