util.subproj/rcmd.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1995, 1996, 1998 Theo de Raadt.  All rights reserved.
  27  * Copyright (c) 1983, 1993, 1994
  28  *      The Regents of the University of California.  All rights reserved.
  29  *
  30  * Redistribution and use in source and binary forms, with or without
  31  * modification, are permitted provided that the following conditions
  32  * are met:
  33  * 1. Redistributions of source code must retain the above copyright
  34  *    notice, this list of conditions and the following disclaimer.
  35  * 2. Redistributions in binary form must reproduce the above copyright
  36  *    notice, this list of conditions and the following disclaimer in the
  37  *    documentation and/or other materials provided with the distribution.
  38  * 3. All advertising materials mentioning features or use of this software
  39  *    must display the following acknowledgement:
  40  *      This product includes software developed by the University of
  41  *      California, Berkeley and its contributors.
  42  *      This product includes software developed by Theo de Raadt.
  43  * 4. Neither the name of the University nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  *
  59  * $FreeBSD: src/lib/libc/net/rcmd.c,v 1.23.2.5 2001/03/05 10:47:11 obrien Exp $
  60  */
  61
  62 #if defined(LIBC_SCCS) && !defined(lint)
  63 static char sccsid[] = "@(#)rcmd.c      8.3 (Berkeley) 3/26/94";
  64 #endif /* LIBC_SCCS and not lint */
  65
  66 #include <sys/param.h>
  67 #include <sys/socket.h>
  68 #include <sys/stat.h>
  69
  70 #include <netinet/in.h>
  71 #include <arpa/inet.h>
  72 #include <netinfo/ni_util.h>
  73
  74 #include <signal.h>
  75 #include <fcntl.h>
  76 #include <netdb.h>
  77 #include <unistd.h>
  78 #include <pwd.h>
  79 #include <errno.h>
  80 #include <stdio.h>
  81 #include <ctype.h>
  82 #include <string.h>
  83 #ifdef YP
  84 #include <rpc/rpc.h>
  85 #include <rpcsvc/yp_prot.h>
  86 #include <rpcsvc/ypclnt.h>
  87 #endif
  88 #include <arpa/nameser8_compat.h>
  89
  90 /* wrapper for KAME-special getnameinfo() */
  91 #ifndef NI_WITHSCOPEID
  92 #define NI_WITHSCOPEID  0
  93 #endif
  94
  95 #ifndef socklen_t
  96 #define socklen_t int
  97 #endif
  98
  99 extern int innetgr __P(( const char *, const char *, const char *, const char * ));
 100 extern int bindresvport_sa(int, struct sockaddr *);
 101
 102 #define max(a, b)       ((a > b) ? a : b)
 103
 104 int     __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
 105 int __ivaliduser_af __P((FILE *,const void *, const char *, const char *,
 106         int, int));
 107 int __ivaliduser_sa __P((FILE *, const struct sockaddr *, socklen_t,
 108         const char *,const char *));
 109 static int __icheckhost __P((const struct sockaddr *, socklen_t,
 110         const char *));
 111
 112 int
 113 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
 114         char **ahost;
 115         u_short rport;
 116         const char *locuser, *remuser, *cmd;
 117         int *fd2p;
 118         int af;
 119 {
 120         struct addrinfo hints, *res, *ai;
 121         struct sockaddr_storage from;
 122         fd_set reads;
 123         long oldmask;
 124         pid_t pid;
 125         int s, aport, lport, timo, error;
 126         char c;
 127         int refused, nres;
 128         char num[8], paddr[NI_MAXHOST];
 129         static char canonnamebuf[MAXDNAME];     /* is it proper here? */
 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         hints.ai_protocol = 0;
 138         (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
 139         error = getaddrinfo(*ahost, num, &hints, &res);
 140         if (error) {
 141                 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 142                         gai_strerror(error));
 143                 if (error == EAI_SYSTEM)
 144                         fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 145                                 strerror(errno));
 146                 return (-1);
 147         }
 148
 149         if (res->ai_canonname
 150          && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
 151                 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
 152                 *ahost = canonnamebuf;
 153         }
 154         nres = 0;
 155         for (ai = res; ai; ai = ai->ai_next)
 156                 nres++;
 157         ai = res;
 158         refused = 0;
 159         oldmask = sigblock(sigmask(SIGURG));
 160         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 161                 s = rresvport_af(&lport, ai->ai_family);
 162                 if (s < 0) {
 163                         if (errno != EAGAIN && ai->ai_next) {
 164                                 ai = ai->ai_next;
 165                                 continue;
 166                         }
 167                         if (errno == EAGAIN)
 168                                 (void)fprintf(stderr,
 169                                     "rcmd: socket: All ports in use\n");
 170                         else
 171                                 (void)fprintf(stderr, "rcmd: socket: %s\n",
 172                                     strerror(errno));
 173                         freeaddrinfo(res);
 174                         sigsetmask(oldmask);
 175                         return (-1);
 176                 }
 177                 fcntl(s, F_SETOWN, pid);
 178                 if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 179                         break;
 180                 (void)close(s);
 181                 if (errno == EADDRINUSE) {
 182                         lport--;
 183                         continue;
 184                 }
 185                 if (errno == ECONNREFUSED)
 186                         refused = 1;
 187                 if (ai->ai_next == NULL && (!refused || timo > 16)) {
 188                         (void)fprintf(stderr, "%s: %s\n",
 189                                       *ahost, strerror(errno));
 190                         freeaddrinfo(res);
 191                         sigsetmask(oldmask);
 192                         return (-1);
 193                 }
 194                 if (nres > 1) {
 195                         int oerrno = errno;
 196
 197                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 198                                     paddr, sizeof(paddr),
 199                                     NULL, 0,
 200                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 201                         (void)fprintf(stderr, "connect to address %s: ",
 202                                       paddr);
 203                         errno = oerrno;
 204                         perror(0);
 205                 }
 206                 if ((ai = ai->ai_next) == NULL) {
 207                         /* refused && timo <= 16 */
 208                         struct timespec time_to_sleep, time_remaining;
 209
 210                         time_to_sleep.tv_sec = timo;
 211                         time_to_sleep.tv_nsec = 0;
 212                         (void)nanosleep(&time_to_sleep, &time_remaining);
 213                         timo *= 2;
 214                         ai = res;
 215                         refused = 0;
 216                 }
 217                 if (nres > 1) {
 218                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 219                                     paddr, sizeof(paddr),
 220                                     NULL, 0,
 221                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 222                         fprintf(stderr, "Trying %s...\n", paddr);
 223                 }
 224         }
 225 #if 0
 226         /*
 227          * try to rresvport() to the same port. This will make rresvport()
 228          * fail it's first bind, resulting in it choosing a random port.
 229          */
 230         lport--;
 231 #endif
 232         if (fd2p == 0) {
 233                 write(s, "", 1);
 234                 lport = 0;
 235         } else {
 236                 char num[8];
 237                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 238                 int len = ai->ai_addrlen;
 239                 int nfds;
 240
 241                 if (s2 < 0)
 242                         goto bad;
 243                 listen(s2, 1);
 244                 (void)snprintf(num, sizeof(num), "%d", lport);
 245                 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
 246                         (void)fprintf(stderr,
 247                             "rcmd: write (setting up stderr): %s\n",
 248                             strerror(errno));
 249                         (void)close(s2);
 250                         goto bad;
 251                 }
 252                 nfds = max(s, s2)+1;
 253                 if(nfds > FD_SETSIZE) {
 254                         fprintf(stderr, "rcmd: too many files\n");
 255                         (void)close(s2);
 256                         goto bad;
 257                 }
 258 again:
 259                 FD_ZERO(&reads);
 260                 FD_SET(s, &reads);
 261                 FD_SET(s2, &reads);
 262                 errno = 0;
 263                 if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
 264                         if (errno != 0)
 265                                 (void)fprintf(stderr,
 266                                     "rcmd: select (setting up stderr): %s\n",
 267                                     strerror(errno));
 268                         else
 269                                 (void)fprintf(stderr,
 270                                 "select: protocol failure in circuit setup\n");
 271                         (void)close(s2);
 272                         goto bad;
 273                 }
 274                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 275                 switch (from.ss_family) {
 276                 case AF_INET:
 277                         aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 278                         break;
 279 #ifdef INET6
 280                 case AF_INET6:
 281                         aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 282                         break;
 283 #endif
 284                 default:
 285                         aport = 0;      /* error */
 286                         break;
 287                 }
 288                 /*
 289                  * XXX careful for ftp bounce attacks. If discovered, shut them
 290                  * down and check for the real auxiliary channel to connect.
 291                  */
 292                 if (aport == 20) {
 293                         close(s3);
 294                         goto again;
 295                 }
 296                 (void)close(s2);
 297                 if (s3 < 0) {
 298                         (void)fprintf(stderr,
 299                             "rcmd: accept: %s\n", strerror(errno));
 300                         lport = 0;
 301                         goto bad;
 302                 }
 303                 *fd2p = s3;
 304                 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
 305                         (void)fprintf(stderr,
 306                             "socket: protocol failure in circuit setup.\n");
 307                         goto bad2;
 308                 }
 309         }
 310         (void)write(s, locuser, strlen(locuser)+1);
 311         (void)write(s, remuser, strlen(remuser)+1);
 312         (void)write(s, cmd, strlen(cmd)+1);
 313         if (read(s, &c, 1) != 1) {
 314                 (void)fprintf(stderr,
 315                     "rcmd: %s: %s\n", *ahost, strerror(errno));
 316                 goto bad2;
 317         }
 318         if (c != 0) {
 319                 while (read(s, &c, 1) == 1) {
 320                         (void)write(STDERR_FILENO, &c, 1);
 321                         if (c == '\n')
 322                                 break;
 323                 }
 324                 goto bad2;
 325         }
 326         sigsetmask(oldmask);
 327         freeaddrinfo(res);
 328         return (s);
 329 bad2:
 330         if (lport)
 331                 (void)close(*fd2p);
 332 bad:
 333         (void)close(s);
 334         sigsetmask(oldmask);
 335         freeaddrinfo(res);
 336         return (-1);
 337 }
 338
 339 int
 340 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 341         char **ahost;
 342         in_port_t rport;
 343         const char *locuser, *remuser, *cmd;
 344         int *fd2p;
 345 {
 346         return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 347 }
 348
 349 int
 350 rresvport(port)
 351         int *port;
 352 {
 353         return rresvport_af(port, AF_INET);
 354 }
 355
 356 int
 357 rresvport_af(alport, family)
 358         int *alport, family;
 359 {
 360         int s;
 361         struct sockaddr_storage ss;
 362         u_short *sport;
 363
 364         memset(&ss, 0, sizeof(ss));
 365         ss.ss_family = family;
 366         switch (family) {
 367         case AF_INET:
 368                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
 369                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 370                 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
 371                 break;
 372 #ifdef INET6
 373         case AF_INET6:
 374                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
 375                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 376                 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
 377                 break;
 378 #endif
 379         default:
 380                 errno = EAFNOSUPPORT;
 381                 return -1;
 382         }
 383
 384         s = socket(ss.ss_family, SOCK_STREAM, 0);
 385         if (s < 0)
 386                 return (-1);
 387 #if 0 /* compat_exact_traditional_rresvport_semantics */
 388         sin.sin_port = htons((u_short)*alport);
 389         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
 390                 return (s);
 391         if (errno != EADDRINUSE) {
 392                 (void)close(s);
 393                 return (-1);
 394         }
 395 #endif
 396         *sport = 0;
 397         if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
 398                 (void)close(s);
 399                 return (-1);
 400         }
 401         *alport = (int)ntohs(*sport);
 402         return (s);
 403 }
 404
 405 int     __check_rhosts_file = 1;
 406 char    *__rcmd_errstr;
 407
 408 /*
 409  * AF independent extension of iruserok.
 410  *
 411  * Returns 0 if ok, -1 if not ok.
 412  */
 413 int
 414 iruserok_sa(ra, rlen, superuser, ruser, luser)
 415         const void *ra;
 416         int rlen;
 417         int superuser;
 418         const char *ruser, *luser;
 419 {
 420         register char *cp;
 421         struct stat sbuf;
 422         struct passwd *pwd;
 423         FILE *hostf;
 424         uid_t uid;
 425         int first;
 426         char pbuf[MAXPATHLEN];
 427         const struct sockaddr *raddr;
 428         struct sockaddr_storage ss;
 429
 430         /* avoid alignment issue */
 431         if (rlen > sizeof(ss))
 432                 return(-1);
 433         memcpy(&ss, ra, rlen);
 434         raddr = (struct sockaddr *)&ss;
 435
 436         first = 1;
 437         hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
 438 again:
 439         if (hostf) {
 440                 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
 441                         (void)fclose(hostf);
 442                         return (0);
 443                 }
 444                 (void)fclose(hostf);
 445         }
 446         if (first == 1 && (__check_rhosts_file || superuser)) {
 447                 first = 0;
 448                 if ((pwd = getpwnam(luser)) == NULL)
 449                         return (-1);
 450                 (void)strcpy(pbuf, pwd->pw_dir);
 451                 (void)strcat(pbuf, "/.rhosts");
 452
 453                 /*
 454                  * Change effective uid while opening .rhosts.  If root and
 455                  * reading an NFS mounted file system, can't read files that
 456                  * are protected read/write owner only.
 457                  */
 458                 uid = geteuid();
 459                 (void)seteuid(pwd->pw_uid);
 460                 hostf = fopen(pbuf, "r");
 461                 (void)seteuid(uid);
 462
 463                 if (hostf == NULL)
 464                         return (-1);
 465                 /*
 466                  * If not a regular file, or is owned by someone other than
 467                  * user or root or if writeable by anyone but the owner, quit.
 468                  */
 469                 cp = NULL;
 470                 if (lstat(pbuf, &sbuf) < 0)
 471                         cp = ".rhosts lstat failed";
 472                 else if (!S_ISREG(sbuf.st_mode))
 473                         cp = ".rhosts not regular file";
 474                 else if (fstat(fileno(hostf), &sbuf) < 0)
 475                         cp = ".rhosts fstat failed";
 476                 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
 477                         cp = "bad .rhosts owner";
 478                 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
 479                         cp = ".rhosts writeable by other than owner";
 480                 /* If there were any problems, quit. */
 481                 if (cp) {
 482                         __rcmd_errstr = cp;
 483                         (void)fclose(hostf);
 484                         return (-1);
 485                 }
 486                 goto again;
 487         }
 488         return (-1);
 489 }
 490
 491 int
 492 ruserok(rhost, superuser, ruser, luser)
 493         const char *rhost, *ruser, *luser;
 494         int superuser;
 495 {
 496         struct addrinfo hints, *res, *r;
 497         int error;
 498
 499         memset(&hints, 0, sizeof(hints));
 500         hints.ai_family = PF_UNSPEC;
 501         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 502         error = getaddrinfo(rhost, "0", &hints, &res);
 503         if (error)
 504                 return (-1);
 505
 506         for (r = res; r; r = r->ai_next) {
 507                 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
 508                     luser) == 0) {
 509                         freeaddrinfo(res);
 510                         return (0);
 511                 }
 512         }
 513         freeaddrinfo(res);
 514         return (-1);
 515 }
 516
 517 /*
 518  * New .rhosts strategy: We are passed an ip address. We spin through
 519  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 520  * has ip addresses, we don't have to trust a nameserver.  When it
 521  * contains hostnames, we spin through the list of addresses the nameserver
 522  * gives us and look for a match.
 523  *
 524  * Returns 0 if ok, -1 if not ok.
 525  */
 526 int
 527 iruserok(raddr, superuser, ruser, luser)
 528         unsigned long raddr;
 529         int superuser;
 530         const char *ruser, *luser;
 531 {
 532         struct sockaddr_in sin;
 533
 534         memset(&sin, 0, sizeof(sin));
 535         sin.sin_family = AF_INET;
 536         sin.sin_len = sizeof(struct sockaddr_in);
 537         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 538         return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
 539                 ruser, luser);
 540 }
 541
 542 /*
 543  * XXX
 544  * Don't make static, used by lpd(8).
 545  *
 546  * Returns 0 if ok, -1 if not ok.
 547  */
 548 int
 549 __ivaliduser(hostf, raddr, luser, ruser)
 550         FILE *hostf;
 551         u_int32_t raddr;
 552         const char *luser, *ruser;
 553 {
 554         struct sockaddr_in sin;
 555
 556         memset(&sin, 0, sizeof(sin));
 557         sin.sin_family = AF_INET;
 558         sin.sin_len = sizeof(struct sockaddr_in);
 559         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 560         return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
 561                 luser, ruser);
 562 }
 563
 564 /*
 565  * Returns 0 if ok, -1 if not ok.
 566  *
 567  * XXX obsolete API.
 568  */
 569 int
 570 __ivaliduser_af(hostf, raddr, luser, ruser, af, len)
 571         FILE *hostf;
 572         const void *raddr;
 573         const char *luser, *ruser;
 574         int af, len;
 575 {
 576         struct sockaddr *sa = NULL;
 577         struct sockaddr_in *sin = NULL;
 578 #ifdef INET6
 579         struct sockaddr_in6 *sin6 = NULL;
 580 #endif
 581         struct sockaddr_storage ss;
 582
 583         memset(&ss, 0, sizeof(ss));
 584         switch (af) {
 585         case AF_INET:
 586                 if (len != sizeof(sin->sin_addr))
 587                         return -1;
 588                 sin = (struct sockaddr_in *)&ss;
 589                 sin->sin_family = AF_INET;
 590                 sin->sin_len = sizeof(struct sockaddr_in);
 591                 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
 592                 break;
 593 #ifdef INET6
 594         case AF_INET6:
 595                 if (len != sizeof(sin6->sin6_addr))
 596                         return -1;
 597                 /* you will lose scope info */
 598                 sin6 = (struct sockaddr_in6 *)&ss;
 599                 sin6->sin6_family = AF_INET6;
 600                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 601                 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
 602                 break;
 603 #endif
 604         default:
 605                 return -1;
 606         }
 607
 608         sa = (struct sockaddr *)&ss;
 609         return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
 610 }
 611
 612 /*
 613  * Returns 0 if ok, -1 if not ok.
 614  */
 615 int
 616 __ivaliduser_sa(hostf, raddr, salen, luser, ruser)
 617         FILE *hostf;
 618         const struct sockaddr *raddr;
 619         socklen_t salen;
 620         const char *luser, *ruser;
 621 {
 622         register char *user, *p;
 623         int ch;
 624         char buf[MAXHOSTNAMELEN + 128];         /* host + login */
 625         char hname[MAXHOSTNAMELEN];
 626         /* Presumed guilty until proven innocent. */
 627         int userok = 0, hostok = 0;
 628 #ifdef YP
 629         char *ypdomain;
 630
 631         if (yp_get_default_domain(&ypdomain))
 632                 ypdomain = NULL;
 633 #else
 634 #define ypdomain NULL
 635 #endif
 636         /*
 637          * We try to get the hostname back for netgroup matching.
 638          * However, the .rosts file may contain IP addresses as well
 639          * as names, so a name is not always required.
 640          */
 641         getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, NI_NAMEREQD);
 642
 643         while (fgets(buf, sizeof(buf), hostf)) {
 644                 p = buf;
 645                 /* Skip lines that are too long. */
 646                 if (strchr(p, '\n') == NULL) {
 647                         while ((ch = getc(hostf)) != '\n' && ch != EOF);
 648                         continue;
 649                 }
 650                 if (*p == '\n' || *p == '#') {
 651                         /* comment... */
 652                         continue;
 653                 }
 654                 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
 655                         *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
 656                         p++;
 657                 }
 658                 if (*p == ' ' || *p == '\t') {
 659                         *p++ = '\0';
 660                         while (*p == ' ' || *p == '\t')
 661                                 p++;
 662                         user = p;
 663                         while (*p != '\n' && *p != ' ' &&
 664                             *p != '\t' && *p != '\0')
 665                                 p++;
 666                 } else
 667                         user = p;
 668                 *p = '\0';
 669                 /*
 670                  * Do +/- and +@/-@ checking. This looks really nasty,
 671                  * but it matches SunOS's behavior so far as I can tell.
 672                  */
 673                 switch(buf[0]) {
 674                 case '+':
 675                         if (!buf[1]) {     /* '+' matches all hosts */
 676                                 hostok = 1;
 677                                 break;
 678                         }
 679                         if (buf[1] == '@')  /* match a host by netgroup */
 680                                 hostok = innetgr((char *)&buf[2],
 681                                         (char *)&hname, NULL, ypdomain);
 682                         else            /* match a host by addr */
 683                                 hostok = __icheckhost(raddr, salen,
 684                                                       (char *)&buf[1]);
 685                         break;
 686                 case '-':     /* reject '-' hosts and all their users */
 687                         if (buf[1] == '@') {
 688                                 if (innetgr((char *)&buf[2],
 689                                               (char *)&hname, NULL, ypdomain))
 690                                         return(-1);
 691                         } else {
 692                                 if (__icheckhost(raddr, salen,
 693                                                  (char *)&buf[1]))
 694                                         return(-1);
 695                         }
 696                         break;
 697                 default:  /* if no '+' or '-', do a simple match */
 698                         hostok = __icheckhost(raddr, salen, buf);
 699                         break;
 700                 }
 701                 switch(*user) {
 702                 case '+':
 703                         if (!*(user+1)) {      /* '+' matches all users */
 704                                 userok = 1;
 705                                 break;
 706                         }
 707                         if (*(user+1) == '@')  /* match a user by netgroup */
 708                                 userok = innetgr(user+2, NULL, ruser, ypdomain);
 709                         else       /* match a user by direct specification */
 710                                 userok = !(strcmp(ruser, user+1));
 711                         break;
 712                 case '-':               /* if we matched a hostname, */
 713                         if (hostok) {   /* check for user field rejections */
 714                                 if (!*(user+1))
 715                                         return(-1);
 716                                 if (*(user+1) == '@') {
 717                                         if (innetgr(user+2, NULL,
 718                                                         ruser, ypdomain))
 719                                                 return(-1);
 720                                 } else {
 721                                         if (!strcmp(ruser, user+1))
 722                                                 return(-1);
 723                                 }
 724                         }
 725                         break;
 726                 default:        /* no rejections: try to match the user */
 727                         if (hostok)
 728                                 userok = !(strcmp(ruser,*user ? user : luser));
 729                         break;
 730                 }
 731                 if (hostok && userok)
 732                         return(0);
 733         }
 734         return (-1);
 735 }
 736
 737 /*
 738  * Returns "true" if match, 0 if no match.
 739  *
 740  * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion
 741  * if af == AF_INET6.
 742  */
 743 static int
 744 __icheckhost(raddr, salen, lhost)
 745         const struct sockaddr *raddr;
 746         socklen_t salen;
 747         const char *lhost;
 748 {
 749         struct sockaddr_in sin;
 750         struct sockaddr_in6 *sin6;
 751         struct addrinfo hints, *res, *r;
 752         int error;
 753         char h1[NI_MAXHOST], h2[NI_MAXHOST];
 754
 755         if (raddr->sa_family == AF_INET6) {
 756                 sin6 = (struct sockaddr_in6 *)raddr;
 757                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 758                         memset(&sin, 0, sizeof(sin));
 759                         sin.sin_family = AF_INET;
 760                         sin.sin_len = sizeof(struct sockaddr_in);
 761                         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 762                                sizeof(sin.sin_addr));
 763                         raddr = (struct sockaddr *)&sin;
 764                         salen = sin.sin_len;
 765                 }
 766         }
 767
 768         h1[0] = '\0';
 769         if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
 770                         NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 771                 return (0);
 772
 773         /* Resolve laddr into sockaddr */
 774         memset(&hints, 0, sizeof(hints));
 775         hints.ai_family = raddr->sa_family;
 776         hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
 777         res = NULL;
 778         error = getaddrinfo(lhost, "0", &hints, &res);
 779         if (error)
 780                 return (0);
 781
 782         for (r = res; r ; r = r->ai_next) {
 783                 h2[0] = '\0';
 784                 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
 785                                 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 786                         continue;
 787                 if (strcmp(h1, h2) == 0) {
 788                         freeaddrinfo(res);
 789                         return (1);
 790                 }
 791         }
 792
 793         /* No match. */
 794         freeaddrinfo(res);
 795         return (0);
 796 }