util.subproj/rcmd.c

   1 /*
   2  * Copyright (c) 1999-2018 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1995, 1996, 1998 Theo de Raadt.  All rights reserved.
  26  * Copyright (c) 1983, 1993, 1994
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  *      This product includes software developed by Theo de Raadt.
  42  * 4. Neither the name of the University nor the names of its contributors
  43  *    may be used to endorse or promote products derived from this software
  44  *    without specific prior written permission.
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  *
  58  * $FreeBSD: src/lib/libc/net/rcmd.c,v 1.23.2.5 2001/03/05 10:47:11 obrien Exp $
  59  */
  60
  61 #if defined(LIBC_SCCS) && !defined(lint)
  62 static char sccsid[] = "@(#)rcmd.c      8.3 (Berkeley) 3/26/94";
  63 #endif /* LIBC_SCCS and not lint */
  64
  65 #include "libinfo_common.h"
  66
  67 #include <sys/param.h>
  68 #include <sys/socket.h>
  69 #include <sys/stat.h>
  70
  71 #include <arpa/inet.h>
  72
  73 #include <signal.h>
  74 #include <fcntl.h>
  75 #include <netdb.h>
  76 #include <unistd.h>
  77 #include <pwd.h>
  78 #include <errno.h>
  79 #include <stdio.h>
  80 #include <ctype.h>
  81 #include <string.h>
  82 #include <time.h>
  83 #ifdef YP
  84 #include <rpc/rpc.h>
  85 #include <rpcsvc/yp_prot.h>
  86 #include <rpcsvc/ypclnt.h>
  87 #endif
  88
  89 #include <arpa/nameser_compat.h>
  90 #include <nameser.h>
  91
  92 /* wrapper for KAME-special getnameinfo() */
  93 #ifndef NI_WITHSCOPEID
  94 #define NI_WITHSCOPEID  0
  95 #endif
  96
  97 #ifndef socklen_t
  98 #define socklen_t int
  99 #endif
 100
 101 extern int innetgr __P(( const char *, const char *, const char *, const char * ));
 102 extern int bindresvport_sa(int, struct sockaddr *);
 103
 104 #define max(a, b)       ((a > b) ? a : b)
 105
 106 int     __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
 107 int __ivaliduser_af __P((FILE *,const void *, const char *, const char *,
 108         int, int));
 109 int __ivaliduser_sa __P((FILE *, const struct sockaddr *, socklen_t,
 110         const char *,const char *));
 111 static int __icheckhost __P((const struct sockaddr *, socklen_t,
 112         const char *));
 113
 114 LIBINFO_EXPORT
 115 int
 116 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
 117         char **ahost;
 118         u_short rport;
 119         const char *locuser, *remuser, *cmd;
 120         int *fd2p;
 121         int af;
 122 {
 123         struct addrinfo hints, *res, *ai;
 124         struct sockaddr_storage from;
 125         fd_set reads;
 126         long oldmask;
 127         pid_t pid;
 128         int s, aport, lport, timo, error;
 129         char c;
 130         int refused, nres;
 131         char num[8], paddr[NI_MAXHOST];
 132         static char canonnamebuf[MAXDNAME];     /* is it proper here? */
 133
 134         pid = getpid();
 135
 136         memset(&hints, 0, sizeof(hints));
 137         hints.ai_flags = AI_CANONNAME;
 138         hints.ai_family = af;
 139         hints.ai_socktype = SOCK_STREAM;
 140         hints.ai_protocol = 0;
 141         (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
 142         error = getaddrinfo(*ahost, num, &hints, &res);
 143         if (error) {
 144                 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 145                         gai_strerror(error));
 146                 if (error == EAI_SYSTEM)
 147                         fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 148                                 strerror(errno));
 149                 return (-1);
 150         }
 151
 152         if (res->ai_canonname
 153          && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
 154                 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
 155                 *ahost = canonnamebuf;
 156         }
 157         nres = 0;
 158         for (ai = res; ai; ai = ai->ai_next)
 159                 nres++;
 160         ai = res;
 161         refused = 0;
 162         oldmask = sigblock(sigmask(SIGURG));
 163         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 164                 s = rresvport_af(&lport, ai->ai_family);
 165                 if (s < 0) {
 166                         if (errno != EAGAIN && ai->ai_next) {
 167                                 ai = ai->ai_next;
 168                                 continue;
 169                         }
 170                         if (errno == EAGAIN)
 171                                 (void)fprintf(stderr,
 172                                     "rcmd: socket: All ports in use\n");
 173                         else
 174                                 (void)fprintf(stderr, "rcmd: socket: %s\n",
 175                                     strerror(errno));
 176                         freeaddrinfo(res);
 177                         sigsetmask(oldmask);
 178                         return (-1);
 179                 }
 180                 fcntl(s, F_SETOWN, pid);
 181                 if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 182                         break;
 183                 (void)close(s);
 184                 if (errno == EADDRINUSE) {
 185                         lport--;
 186                         continue;
 187                 }
 188                 if (errno == ECONNREFUSED)
 189                         refused = 1;
 190                 if (ai->ai_next == NULL && (!refused || timo > 16)) {
 191                         (void)fprintf(stderr, "%s: %s\n",
 192                                       *ahost, strerror(errno));
 193                         freeaddrinfo(res);
 194                         sigsetmask(oldmask);
 195                         return (-1);
 196                 }
 197                 if (nres > 1) {
 198                         int oerrno = errno;
 199
 200                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 201                                     paddr, sizeof(paddr),
 202                                     NULL, 0,
 203                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 204                         (void)fprintf(stderr, "connect to address %s: ",
 205                                       paddr);
 206                         errno = oerrno;
 207                         perror(0);
 208                 }
 209                 if ((ai = ai->ai_next) == NULL) {
 210                         /* refused && timo <= 16 */
 211                         struct timespec time_to_sleep, time_remaining;
 212
 213                         time_to_sleep.tv_sec = timo;
 214                         time_to_sleep.tv_nsec = 0;
 215                         (void)nanosleep(&time_to_sleep, &time_remaining);
 216                         timo *= 2;
 217                         ai = res;
 218                         refused = 0;
 219                 }
 220                 if (nres > 1) {
 221                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 222                                     paddr, sizeof(paddr),
 223                                     NULL, 0,
 224                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 225                         fprintf(stderr, "Trying %s...\n", paddr);
 226                 }
 227         }
 228 #if 0
 229         /*
 230          * try to rresvport() to the same port. This will make rresvport()
 231          * fail it's first bind, resulting in it choosing a random port.
 232          */
 233         lport--;
 234 #endif
 235         if (fd2p == 0) {
 236                 write(s, "", 1);
 237                 lport = 0;
 238         } else {
 239                 char num[8];
 240                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 241                 unsigned int len = ai->ai_addrlen;
 242                 int nfds;
 243
 244                 if (s2 < 0)
 245                         goto bad;
 246                 listen(s2, 1);
 247                 (void)snprintf(num, sizeof(num), "%d", lport);
 248                 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
 249                         (void)fprintf(stderr,
 250                             "rcmd: write (setting up stderr): %s\n",
 251                             strerror(errno));
 252                         (void)close(s2);
 253                         goto bad;
 254                 }
 255                 nfds = max(s, s2)+1;
 256                 if(nfds > FD_SETSIZE) {
 257                         fprintf(stderr, "rcmd: too many files\n");
 258                         (void)close(s2);
 259                         goto bad;
 260                 }
 261 again:
 262                 FD_ZERO(&reads);
 263                 FD_SET(s, &reads);
 264                 FD_SET(s2, &reads);
 265                 errno = 0;
 266                 if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
 267                         if (errno != 0)
 268                                 (void)fprintf(stderr,
 269                                     "rcmd: select (setting up stderr): %s\n",
 270                                     strerror(errno));
 271                         else
 272                                 (void)fprintf(stderr,
 273                                 "select: protocol failure in circuit setup\n");
 274                         (void)close(s2);
 275                         goto bad;
 276                 }
 277                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 278                 switch (from.ss_family) {
 279                 case AF_INET:
 280                         aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 281                         break;
 282 #ifdef INET6
 283                 case AF_INET6:
 284                         aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 285                         break;
 286 #endif
 287                 default:
 288                         aport = 0;      /* error */
 289                         break;
 290                 }
 291                 /*
 292                  * XXX careful for ftp bounce attacks. If discovered, shut them
 293                  * down and check for the real auxiliary channel to connect.
 294                  */
 295                 if (aport == 20) {
 296                         close(s3);
 297                         goto again;
 298                 }
 299                 (void)close(s2);
 300                 if (s3 < 0) {
 301                         (void)fprintf(stderr,
 302                             "rcmd: accept: %s\n", strerror(errno));
 303                         lport = 0;
 304                         goto bad;
 305                 }
 306                 *fd2p = s3;
 307                 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
 308                         (void)fprintf(stderr,
 309                             "socket: protocol failure in circuit setup.\n");
 310                         goto bad2;
 311                 }
 312         }
 313         (void)write(s, locuser, strlen(locuser)+1);
 314         (void)write(s, remuser, strlen(remuser)+1);
 315         (void)write(s, cmd, strlen(cmd)+1);
 316         if (read(s, &c, 1) != 1) {
 317                 (void)fprintf(stderr,
 318                     "rcmd: %s: %s\n", *ahost, strerror(errno));
 319                 goto bad2;
 320         }
 321         if (c != 0) {
 322                 while (read(s, &c, 1) == 1) {
 323                         (void)write(STDERR_FILENO, &c, 1);
 324                         if (c == '\n')
 325                                 break;
 326                 }
 327                 goto bad2;
 328         }
 329         sigsetmask(oldmask);
 330         freeaddrinfo(res);
 331         return (s);
 332 bad2:
 333         if (lport)
 334                 (void)close(*fd2p);
 335 bad:
 336         (void)close(s);
 337         sigsetmask(oldmask);
 338         freeaddrinfo(res);
 339         return (-1);
 340 }
 341
 342 LIBINFO_EXPORT
 343 int
 344 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 345         char **ahost;
 346         in_port_t rport;
 347         const char *locuser, *remuser, *cmd;
 348         int *fd2p;
 349 {
 350         return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 351 }
 352
 353 LIBINFO_EXPORT
 354 int
 355 rresvport(port)
 356         int *port;
 357 {
 358         return rresvport_af(port, AF_INET);
 359 }
 360
 361 LIBINFO_EXPORT
 362 int
 363 rresvport_af(alport, family)
 364         int *alport, family;
 365 {
 366         int s;
 367         struct sockaddr_storage ss;
 368         u_short *sport;
 369
 370         memset(&ss, 0, sizeof(ss));
 371         ss.ss_family = family;
 372         switch (family) {
 373         case AF_INET:
 374                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
 375                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 376                 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
 377                 break;
 378 #ifdef INET6
 379         case AF_INET6:
 380                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
 381                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 382                 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
 383                 break;
 384 #endif
 385         default:
 386                 errno = EAFNOSUPPORT;
 387                 return -1;
 388         }
 389
 390         s = socket(ss.ss_family, SOCK_STREAM, 0);
 391         if (s < 0)
 392                 return (-1);
 393 #if 0 /* compat_exact_traditional_rresvport_semantics */
 394         sin.sin_port = htons((u_short)*alport);
 395         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
 396                 return (s);
 397         if (errno != EADDRINUSE) {
 398                 (void)close(s);
 399                 return (-1);
 400         }
 401 #endif
 402         *sport = 0;
 403         if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
 404                 (void)close(s);
 405                 return (-1);
 406         }
 407         *alport = (int)ntohs(*sport);
 408         return (s);
 409 }
 410
 411 int     __check_rhosts_file = 1;
 412 char    *__rcmd_errstr;
 413
 414 /*  Guess at the size of a password buffer for getpwnam_r (see lookup.subproj/lu_group.c) */
 415 #define MAXPWBUF (MAXLOGNAME + 1 + _PASSWORD_LEN + 1 + MAXPATHLEN + 1 + MAXPATHLEN + 1 + 4098)
 416
 417 /*
 418  * AF independent extension of iruserok.
 419  *
 420  * Returns 0 if ok, -1 if not ok.
 421  */
 422 LIBINFO_EXPORT
 423 int
 424 iruserok_sa(ra, rlen, superuser, ruser, luser)
 425         const void *ra;
 426         int rlen;
 427         int superuser;
 428         const char *ruser, *luser;
 429 {
 430         register char *cp;
 431         struct stat sbuf;
 432         struct passwd p, *pwd;
 433         FILE *hostf;
 434         uid_t uid;
 435         int first, status;
 436         char pbuf[MAXPATHLEN];
 437         const struct sockaddr *raddr;
 438         struct sockaddr_storage ss;
 439         char pwbuf[MAXPWBUF];
 440
 441         /* avoid alignment issue */
 442         if (rlen > sizeof(ss))
 443                 return(-1);
 444         memcpy(&ss, ra, rlen);
 445         raddr = (struct sockaddr *)&ss;
 446
 447         first = 1;
 448         hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
 449 again:
 450         if (hostf) {
 451                 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
 452                         (void)fclose(hostf);
 453                         return (0);
 454                 }
 455                 (void)fclose(hostf);
 456         }
 457         if (first == 1 && (__check_rhosts_file || superuser)) {
 458                 first = 0;
 459
 460                 memset(&p, 0, sizeof(struct passwd));
 461                 memset(pwbuf, 0, sizeof(pwbuf));
 462                 pwd = NULL;
 463
 464                 status = getpwnam_r(luser, &p, pwbuf, MAXPWBUF, &pwd);
 465                 if (status != 0) return -1;
 466
 467                 (void)strcpy(pbuf, pwd->pw_dir);
 468                 (void)strcat(pbuf, "/.rhosts");
 469
 470                 /*
 471                  * Change effective uid while opening .rhosts.  If root and
 472                  * reading an NFS mounted file system, can't read files that
 473                  * are protected read/write owner only.
 474                  */
 475                 uid = geteuid();
 476                 (void)seteuid(pwd->pw_uid);
 477                 hostf = fopen(pbuf, "r");
 478                 (void)seteuid(uid);
 479
 480                 if (hostf == NULL)
 481                         return (-1);
 482                 /*
 483                  * If not a regular file, or is owned by someone other than
 484                  * user or root or if writeable by anyone but the owner, quit.
 485                  */
 486                 cp = NULL;
 487                 if (lstat(pbuf, &sbuf) < 0)
 488                         cp = ".rhosts lstat failed";
 489                 else if (!S_ISREG(sbuf.st_mode))
 490                         cp = ".rhosts not regular file";
 491                 else if (fstat(fileno(hostf), &sbuf) < 0)
 492                         cp = ".rhosts fstat failed";
 493                 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
 494                         cp = "bad .rhosts owner";
 495                 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
 496                         cp = ".rhosts writeable by other than owner";
 497                 /* If there were any problems, quit. */
 498                 if (cp) {
 499                         __rcmd_errstr = cp;
 500                         (void)fclose(hostf);
 501                         return (-1);
 502                 }
 503                 goto again;
 504         }
 505         return (-1);
 506 }
 507
 508 LIBINFO_EXPORT
 509 int
 510 ruserok(rhost, superuser, ruser, luser)
 511         const char *rhost, *ruser, *luser;
 512         int superuser;
 513 {
 514         struct addrinfo hints, *res, *r;
 515         int error;
 516
 517         memset(&hints, 0, sizeof(hints));
 518         hints.ai_family = PF_UNSPEC;
 519         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 520         error = getaddrinfo(rhost, "0", &hints, &res);
 521         if (error)
 522                 return (-1);
 523
 524         for (r = res; r; r = r->ai_next) {
 525                 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
 526                     luser) == 0) {
 527                         freeaddrinfo(res);
 528                         return (0);
 529                 }
 530         }
 531         freeaddrinfo(res);
 532         return (-1);
 533 }
 534
 535 /*
 536  * New .rhosts strategy: We are passed an ip address. We spin through
 537  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 538  * has ip addresses, we don't have to trust a nameserver.  When it
 539  * contains hostnames, we spin through the list of addresses the nameserver
 540  * gives us and look for a match.
 541  *
 542  * Returns 0 if ok, -1 if not ok.
 543  */
 544 LIBINFO_EXPORT
 545 int
 546 iruserok(raddr, superuser, ruser, luser)
 547         unsigned long raddr;
 548         int superuser;
 549         const char *ruser, *luser;
 550 {
 551         struct sockaddr_in sin;
 552
 553         memset(&sin, 0, sizeof(sin));
 554         sin.sin_family = AF_INET;
 555         sin.sin_len = sizeof(struct sockaddr_in);
 556         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 557         return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
 558                 ruser, luser);
 559 }
 560
 561 /*
 562  * XXX
 563  * Don't make static, used by lpd(8).
 564  *
 565  * Returns 0 if ok, -1 if not ok.
 566  */
 567 int
 568 __ivaliduser(hostf, raddr, luser, ruser)
 569         FILE *hostf;
 570         u_int32_t raddr;
 571         const char *luser, *ruser;
 572 {
 573         struct sockaddr_in sin;
 574
 575         memset(&sin, 0, sizeof(sin));
 576         sin.sin_family = AF_INET;
 577         sin.sin_len = sizeof(struct sockaddr_in);
 578         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 579         return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
 580                 luser, ruser);
 581 }
 582
 583 /*
 584  * Returns 0 if ok, -1 if not ok.
 585  *
 586  * XXX obsolete API.
 587  */
 588 int
 589 __ivaliduser_af(hostf, raddr, luser, ruser, af, len)
 590         FILE *hostf;
 591         const void *raddr;
 592         const char *luser, *ruser;
 593         int af, len;
 594 {
 595         struct sockaddr *sa = NULL;
 596         struct sockaddr_in *sin = NULL;
 597 #ifdef INET6
 598         struct sockaddr_in6 *sin6 = NULL;
 599 #endif
 600         struct sockaddr_storage ss;
 601
 602         memset(&ss, 0, sizeof(ss));
 603         switch (af) {
 604         case AF_INET:
 605                 if (len != sizeof(sin->sin_addr))
 606                         return -1;
 607                 sin = (struct sockaddr_in *)&ss;
 608                 sin->sin_family = AF_INET;
 609                 sin->sin_len = sizeof(struct sockaddr_in);
 610                 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
 611                 break;
 612 #ifdef INET6
 613         case AF_INET6:
 614                 if (len != sizeof(sin6->sin6_addr))
 615                         return -1;
 616                 /* you will lose scope info */
 617                 sin6 = (struct sockaddr_in6 *)&ss;
 618                 sin6->sin6_family = AF_INET6;
 619                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 620                 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
 621                 break;
 622 #endif
 623         default:
 624                 return -1;
 625         }
 626
 627         sa = (struct sockaddr *)&ss;
 628         return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
 629 }
 630
 631 /*
 632  * Returns 0 if ok, -1 if not ok.
 633  */
 634 int
 635 __ivaliduser_sa(hostf, raddr, salen, luser, ruser)
 636         FILE *hostf;
 637         const struct sockaddr *raddr;
 638         socklen_t salen;
 639         const char *luser, *ruser;
 640 {
 641         register char *user, *p;
 642         int ch;
 643         char buf[MAXHOSTNAMELEN + 128];         /* host + login */
 644         char hname[MAXHOSTNAMELEN];
 645         /* Presumed guilty until proven innocent. */
 646         int userok = 0, hostok = 0;
 647 #ifdef YP
 648         char *ypdomain;
 649
 650         if (yp_get_default_domain(&ypdomain))
 651                 ypdomain = NULL;
 652 #else
 653 #define ypdomain NULL
 654 #endif
 655         /*
 656          * We try to get the hostname back for netgroup matching.
 657          * However, the .rosts file may contain IP addresses as well
 658          * as names, so a name is not always required.
 659          */
 660         getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, NI_NAMEREQD);
 661
 662         while (fgets(buf, sizeof(buf), hostf)) {
 663                 p = buf;
 664                 /* Skip lines that are too long. */
 665                 if (strchr(p, '\n') == NULL) {
 666                         while ((ch = getc(hostf)) != '\n' && ch != EOF);
 667                         continue;
 668                 }
 669                 if (*p == '\n' || *p == '#') {
 670                         /* comment... */
 671                         continue;
 672                 }
 673                 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
 674                         *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
 675                         p++;
 676                 }
 677                 if (*p == ' ' || *p == '\t') {
 678                         *p++ = '\0';
 679                         while (*p == ' ' || *p == '\t')
 680                                 p++;
 681                         user = p;
 682                         while (*p != '\n' && *p != ' ' &&
 683                             *p != '\t' && *p != '\0')
 684                                 p++;
 685                 } else
 686                         user = p;
 687                 *p = '\0';
 688                 /*
 689                  * Do +/- and +@/-@ checking. This looks really nasty,
 690                  * but it matches SunOS's behavior so far as I can tell.
 691                  */
 692                 switch(buf[0]) {
 693                 case '+':
 694                         if (!buf[1]) {     /* '+' matches all hosts */
 695                                 hostok = 1;
 696                                 break;
 697                         }
 698                         if (buf[1] == '@')  /* match a host by netgroup */
 699                                 hostok = innetgr((char *)&buf[2],
 700                                         (char *)&hname, NULL, ypdomain);
 701                         else            /* match a host by addr */
 702                                 hostok = __icheckhost(raddr, salen,
 703                                                       (char *)&buf[1]);
 704                         break;
 705                 case '-':     /* reject '-' hosts and all their users */
 706                         if (buf[1] == '@') {
 707                                 if (innetgr((char *)&buf[2],
 708                                               (char *)&hname, NULL, ypdomain))
 709                                         return(-1);
 710                         } else {
 711                                 if (__icheckhost(raddr, salen,
 712                                                  (char *)&buf[1]))
 713                                         return(-1);
 714                         }
 715                         break;
 716                 default:  /* if no '+' or '-', do a simple match */
 717                         hostok = __icheckhost(raddr, salen, buf);
 718                         break;
 719                 }
 720                 switch(*user) {
 721                 case '+':
 722                         if (!*(user+1)) {      /* '+' matches all users */
 723                                 userok = 1;
 724                                 break;
 725                         }
 726                         if (*(user+1) == '@')  /* match a user by netgroup */
 727                                 userok = innetgr(user+2, NULL, ruser, ypdomain);
 728                         else       /* match a user by direct specification */
 729                                 userok = !(strcmp(ruser, user+1));
 730                         break;
 731                 case '-':               /* if we matched a hostname, */
 732                         if (hostok) {   /* check for user field rejections */
 733                                 if (!*(user+1))
 734                                         return(-1);
 735                                 if (*(user+1) == '@') {
 736                                         if (innetgr(user+2, NULL,
 737                                                         ruser, ypdomain))
 738                                                 return(-1);
 739                                 } else {
 740                                         if (!strcmp(ruser, user+1))
 741                                                 return(-1);
 742                                 }
 743                         }
 744                         break;
 745                 default:        /* no rejections: try to match the user */
 746                         if (hostok)
 747                                 userok = !(strcmp(ruser,*user ? user : luser));
 748                         break;
 749                 }
 750                 if (hostok && userok)
 751                         return(0);
 752         }
 753         return (-1);
 754 }
 755
 756 /*
 757  * Returns "true" if match, 0 if no match.
 758  *
 759  * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion
 760  * if af == AF_INET6.
 761  */
 762 static int
 763 __icheckhost(raddr, salen, lhost)
 764         const struct sockaddr *raddr;
 765         socklen_t salen;
 766         const char *lhost;
 767 {
 768         struct sockaddr_in sin;
 769         struct sockaddr_in6 *sin6;
 770         struct addrinfo hints, *res, *r;
 771         int error;
 772         char h1[NI_MAXHOST], h2[NI_MAXHOST];
 773
 774         if (raddr->sa_family == AF_INET6) {
 775                 sin6 = (struct sockaddr_in6 *)raddr;
 776                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 777                         memset(&sin, 0, sizeof(sin));
 778                         sin.sin_family = AF_INET;
 779                         sin.sin_len = sizeof(struct sockaddr_in);
 780                         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 781                                sizeof(sin.sin_addr));
 782                         raddr = (struct sockaddr *)&sin;
 783                         salen = sin.sin_len;
 784                 }
 785         }
 786
 787         h1[0] = '\0';
 788         if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
 789                         NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 790                 return (0);
 791
 792         /* Resolve laddr into sockaddr */
 793         memset(&hints, 0, sizeof(hints));
 794         hints.ai_family = raddr->sa_family;
 795         hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
 796         res = NULL;
 797         error = getaddrinfo(lhost, "0", &hints, &res);
 798         if (error)
 799                 return (0);
 800
 801         for (r = res; r ; r = r->ai_next) {
 802                 h2[0] = '\0';
 803                 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
 804                                 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 805                         continue;
 806                 if (strcmp(h1, h2) == 0) {
 807                         freeaddrinfo(res);
 808                         return (1);
 809                 }
 810         }
 811
 812         /* No match. */
 813         freeaddrinfo(res);
 814         return (0);
 815 }