util.subproj/rcmd.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, 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 <sys/param.h>
  66 #include <sys/socket.h>
  67 #include <sys/stat.h>
  68
  69 #include <arpa/inet.h>
  70
  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 <ctype.h>
  79 #include <string.h>
  80 #include <time.h>
  81 #ifdef YP
  82 #include <rpc/rpc.h>
  83 #include <rpcsvc/yp_prot.h>
  84 #include <rpcsvc/ypclnt.h>
  85 #endif
  86 #include <arpa/nameser8_compat.h>
  87
  88 /* wrapper for KAME-special getnameinfo() */
  89 #ifndef NI_WITHSCOPEID
  90 #define NI_WITHSCOPEID  0
  91 #endif
  92
  93 #ifndef socklen_t
  94 #define socklen_t int
  95 #endif
  96
  97 extern int innetgr __P(( const char *, const char *, const char *, const char * ));
  98 extern int bindresvport_sa(int, struct sockaddr *);
  99
 100 #define max(a, b)       ((a > b) ? a : b)
 101
 102 int     __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
 103 int __ivaliduser_af __P((FILE *,const void *, const char *, const char *,
 104         int, int));
 105 int __ivaliduser_sa __P((FILE *, const struct sockaddr *, socklen_t,
 106         const char *,const char *));
 107 static int __icheckhost __P((const struct sockaddr *, socklen_t,
 108         const char *));
 109
 110 int
 111 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
 112         char **ahost;
 113         u_short rport;
 114         const char *locuser, *remuser, *cmd;
 115         int *fd2p;
 116         int af;
 117 {
 118         struct addrinfo hints, *res, *ai;
 119         struct sockaddr_storage from;
 120         fd_set reads;
 121         long oldmask;
 122         pid_t pid;
 123         int s, aport, lport, timo, error;
 124         char c;
 125         int refused, nres;
 126         char num[8], paddr[NI_MAXHOST];
 127         static char canonnamebuf[MAXDNAME];     /* is it proper here? */
 128
 129         pid = getpid();
 130
 131         memset(&hints, 0, sizeof(hints));
 132         hints.ai_flags = AI_CANONNAME;
 133         hints.ai_family = af;
 134         hints.ai_socktype = SOCK_STREAM;
 135         hints.ai_protocol = 0;
 136         (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
 137         error = getaddrinfo(*ahost, num, &hints, &res);
 138         if (error) {
 139                 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 140                         gai_strerror(error));
 141                 if (error == EAI_SYSTEM)
 142                         fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 143                                 strerror(errno));
 144                 return (-1);
 145         }
 146
 147         if (res->ai_canonname
 148          && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
 149                 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
 150                 *ahost = canonnamebuf;
 151         }
 152         nres = 0;
 153         for (ai = res; ai; ai = ai->ai_next)
 154                 nres++;
 155         ai = res;
 156         refused = 0;
 157         oldmask = sigblock(sigmask(SIGURG));
 158         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 159                 s = rresvport_af(&lport, ai->ai_family);
 160                 if (s < 0) {
 161                         if (errno != EAGAIN && ai->ai_next) {
 162                                 ai = ai->ai_next;
 163                                 continue;
 164                         }
 165                         if (errno == EAGAIN)
 166                                 (void)fprintf(stderr,
 167                                     "rcmd: socket: All ports in use\n");
 168                         else
 169                                 (void)fprintf(stderr, "rcmd: socket: %s\n",
 170                                     strerror(errno));
 171                         freeaddrinfo(res);
 172                         sigsetmask(oldmask);
 173                         return (-1);
 174                 }
 175                 fcntl(s, F_SETOWN, pid);
 176                 if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 177                         break;
 178                 (void)close(s);
 179                 if (errno == EADDRINUSE) {
 180                         lport--;
 181                         continue;
 182                 }
 183                 if (errno == ECONNREFUSED)
 184                         refused = 1;
 185                 if (ai->ai_next == NULL && (!refused || timo > 16)) {
 186                         (void)fprintf(stderr, "%s: %s\n",
 187                                       *ahost, strerror(errno));
 188                         freeaddrinfo(res);
 189                         sigsetmask(oldmask);
 190                         return (-1);
 191                 }
 192                 if (nres > 1) {
 193                         int oerrno = errno;
 194
 195                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 196                                     paddr, sizeof(paddr),
 197                                     NULL, 0,
 198                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 199                         (void)fprintf(stderr, "connect to address %s: ",
 200                                       paddr);
 201                         errno = oerrno;
 202                         perror(0);
 203                 }
 204                 if ((ai = ai->ai_next) == NULL) {
 205                         /* refused && timo <= 16 */
 206                         struct timespec time_to_sleep, time_remaining;
 207
 208                         time_to_sleep.tv_sec = timo;
 209                         time_to_sleep.tv_nsec = 0;
 210                         (void)nanosleep(&time_to_sleep, &time_remaining);
 211                         timo *= 2;
 212                         ai = res;
 213                         refused = 0;
 214                 }
 215                 if (nres > 1) {
 216                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 217                                     paddr, sizeof(paddr),
 218                                     NULL, 0,
 219                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 220                         fprintf(stderr, "Trying %s...\n", paddr);
 221                 }
 222         }
 223 #if 0
 224         /*
 225          * try to rresvport() to the same port. This will make rresvport()
 226          * fail it's first bind, resulting in it choosing a random port.
 227          */
 228         lport--;
 229 #endif
 230         if (fd2p == 0) {
 231                 write(s, "", 1);
 232                 lport = 0;
 233         } else {
 234                 char num[8];
 235                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 236                 unsigned int len = ai->ai_addrlen;
 237                 int nfds;
 238
 239                 if (s2 < 0)
 240                         goto bad;
 241                 listen(s2, 1);
 242                 (void)snprintf(num, sizeof(num), "%d", lport);
 243                 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
 244                         (void)fprintf(stderr,
 245                             "rcmd: write (setting up stderr): %s\n",
 246                             strerror(errno));
 247                         (void)close(s2);
 248                         goto bad;
 249                 }
 250                 nfds = max(s, s2)+1;
 251                 if(nfds > FD_SETSIZE) {
 252                         fprintf(stderr, "rcmd: too many files\n");
 253                         (void)close(s2);
 254                         goto bad;
 255                 }
 256 again:
 257                 FD_ZERO(&reads);
 258                 FD_SET(s, &reads);
 259                 FD_SET(s2, &reads);
 260                 errno = 0;
 261                 if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
 262                         if (errno != 0)
 263                                 (void)fprintf(stderr,
 264                                     "rcmd: select (setting up stderr): %s\n",
 265                                     strerror(errno));
 266                         else
 267                                 (void)fprintf(stderr,
 268                                 "select: protocol failure in circuit setup\n");
 269                         (void)close(s2);
 270                         goto bad;
 271                 }
 272                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 273                 switch (from.ss_family) {
 274                 case AF_INET:
 275                         aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 276                         break;
 277 #ifdef INET6
 278                 case AF_INET6:
 279                         aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 280                         break;
 281 #endif
 282                 default:
 283                         aport = 0;      /* error */
 284                         break;
 285                 }
 286                 /*
 287                  * XXX careful for ftp bounce attacks. If discovered, shut them
 288                  * down and check for the real auxiliary channel to connect.
 289                  */
 290                 if (aport == 20) {
 291                         close(s3);
 292                         goto again;
 293                 }
 294                 (void)close(s2);
 295                 if (s3 < 0) {
 296                         (void)fprintf(stderr,
 297                             "rcmd: accept: %s\n", strerror(errno));
 298                         lport = 0;
 299                         goto bad;
 300                 }
 301                 *fd2p = s3;
 302                 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
 303                         (void)fprintf(stderr,
 304                             "socket: protocol failure in circuit setup.\n");
 305                         goto bad2;
 306                 }
 307         }
 308         (void)write(s, locuser, strlen(locuser)+1);
 309         (void)write(s, remuser, strlen(remuser)+1);
 310         (void)write(s, cmd, strlen(cmd)+1);
 311         if (read(s, &c, 1) != 1) {
 312                 (void)fprintf(stderr,
 313                     "rcmd: %s: %s\n", *ahost, strerror(errno));
 314                 goto bad2;
 315         }
 316         if (c != 0) {
 317                 while (read(s, &c, 1) == 1) {
 318                         (void)write(STDERR_FILENO, &c, 1);
 319                         if (c == '\n')
 320                                 break;
 321                 }
 322                 goto bad2;
 323         }
 324         sigsetmask(oldmask);
 325         freeaddrinfo(res);
 326         return (s);
 327 bad2:
 328         if (lport)
 329                 (void)close(*fd2p);
 330 bad:
 331         (void)close(s);
 332         sigsetmask(oldmask);
 333         freeaddrinfo(res);
 334         return (-1);
 335 }
 336
 337 int
 338 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 339         char **ahost;
 340         in_port_t rport;
 341         const char *locuser, *remuser, *cmd;
 342         int *fd2p;
 343 {
 344         return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 345 }
 346
 347 int
 348 rresvport(port)
 349         int *port;
 350 {
 351         return rresvport_af(port, AF_INET);
 352 }
 353
 354 int
 355 rresvport_af(alport, family)
 356         int *alport, family;
 357 {
 358         int s;
 359         struct sockaddr_storage ss;
 360         u_short *sport;
 361
 362         memset(&ss, 0, sizeof(ss));
 363         ss.ss_family = family;
 364         switch (family) {
 365         case AF_INET:
 366                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
 367                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 368                 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
 369                 break;
 370 #ifdef INET6
 371         case AF_INET6:
 372                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
 373                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 374                 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
 375                 break;
 376 #endif
 377         default:
 378                 errno = EAFNOSUPPORT;
 379                 return -1;
 380         }
 381
 382         s = socket(ss.ss_family, SOCK_STREAM, 0);
 383         if (s < 0)
 384                 return (-1);
 385 #if 0 /* compat_exact_traditional_rresvport_semantics */
 386         sin.sin_port = htons((u_short)*alport);
 387         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
 388                 return (s);
 389         if (errno != EADDRINUSE) {
 390                 (void)close(s);
 391                 return (-1);
 392         }
 393 #endif
 394         *sport = 0;
 395         if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
 396                 (void)close(s);
 397                 return (-1);
 398         }
 399         *alport = (int)ntohs(*sport);
 400         return (s);
 401 }
 402
 403 int     __check_rhosts_file = 1;
 404 char    *__rcmd_errstr;
 405
 406 /*  Guess at the size of a password buffer for getpwnam_r (see lookup.subproj/lu_group.c) */
 407 #define MAXPWBUF (MAXLOGNAME + 1 + _PASSWORD_LEN + 1 + MAXPATHLEN + 1 + MAXPATHLEN + 1 + 4098)
 408
 409 /*
 410  * AF independent extension of iruserok.
 411  *
 412  * Returns 0 if ok, -1 if not ok.
 413  */
 414 int
 415 iruserok_sa(ra, rlen, superuser, ruser, luser)
 416         const void *ra;
 417         int rlen;
 418         int superuser;
 419         const char *ruser, *luser;
 420 {
 421         register char *cp;
 422         struct stat sbuf;
 423         struct passwd p, *pwd;
 424         FILE *hostf;
 425         uid_t uid;
 426         int first, status;
 427         char pbuf[MAXPATHLEN];
 428         const struct sockaddr *raddr;
 429         struct sockaddr_storage ss;
 430         char pwbuf[MAXPWBUF];
 431
 432         /* avoid alignment issue */
 433         if (rlen > sizeof(ss))
 434                 return(-1);
 435         memcpy(&ss, ra, rlen);
 436         raddr = (struct sockaddr *)&ss;
 437
 438         first = 1;
 439         hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
 440 again:
 441         if (hostf) {
 442                 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
 443                         (void)fclose(hostf);
 444                         return (0);
 445                 }
 446                 (void)fclose(hostf);
 447         }
 448         if (first == 1 && (__check_rhosts_file || superuser)) {
 449                 first = 0;
 450
 451                 memset(&p, 0, sizeof(struct passwd));
 452                 memset(pwbuf, 0, sizeof(pwbuf));
 453                 pwd = NULL;
 454
 455                 status = getpwnam_r(luser, &p, pwbuf, MAXPWBUF, &pwd);
 456                 if (status != 0) return -1;
 457
 458                 (void)strcpy(pbuf, pwd->pw_dir);
 459                 (void)strcat(pbuf, "/.rhosts");
 460
 461                 /*
 462                  * Change effective uid while opening .rhosts.  If root and
 463                  * reading an NFS mounted file system, can't read files that
 464                  * are protected read/write owner only.
 465                  */
 466                 uid = geteuid();
 467                 (void)seteuid(pwd->pw_uid);
 468                 hostf = fopen(pbuf, "r");
 469                 (void)seteuid(uid);
 470
 471                 if (hostf == NULL)
 472                         return (-1);
 473                 /*
 474                  * If not a regular file, or is owned by someone other than
 475                  * user or root or if writeable by anyone but the owner, quit.
 476                  */
 477                 cp = NULL;
 478                 if (lstat(pbuf, &sbuf) < 0)
 479                         cp = ".rhosts lstat failed";
 480                 else if (!S_ISREG(sbuf.st_mode))
 481                         cp = ".rhosts not regular file";
 482                 else if (fstat(fileno(hostf), &sbuf) < 0)
 483                         cp = ".rhosts fstat failed";
 484                 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
 485                         cp = "bad .rhosts owner";
 486                 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
 487                         cp = ".rhosts writeable by other than owner";
 488                 /* If there were any problems, quit. */
 489                 if (cp) {
 490                         __rcmd_errstr = cp;
 491                         (void)fclose(hostf);
 492                         return (-1);
 493                 }
 494                 goto again;
 495         }
 496         return (-1);
 497 }
 498
 499 int
 500 ruserok(rhost, superuser, ruser, luser)
 501         const char *rhost, *ruser, *luser;
 502         int superuser;
 503 {
 504         struct addrinfo hints, *res, *r;
 505         int error;
 506
 507         memset(&hints, 0, sizeof(hints));
 508         hints.ai_family = PF_UNSPEC;
 509         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 510         error = getaddrinfo(rhost, "0", &hints, &res);
 511         if (error)
 512                 return (-1);
 513
 514         for (r = res; r; r = r->ai_next) {
 515                 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
 516                     luser) == 0) {
 517                         freeaddrinfo(res);
 518                         return (0);
 519                 }
 520         }
 521         freeaddrinfo(res);
 522         return (-1);
 523 }
 524
 525 /*
 526  * New .rhosts strategy: We are passed an ip address. We spin through
 527  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 528  * has ip addresses, we don't have to trust a nameserver.  When it
 529  * contains hostnames, we spin through the list of addresses the nameserver
 530  * gives us and look for a match.
 531  *
 532  * Returns 0 if ok, -1 if not ok.
 533  */
 534 int
 535 iruserok(raddr, superuser, ruser, luser)
 536         unsigned long raddr;
 537         int superuser;
 538         const char *ruser, *luser;
 539 {
 540         struct sockaddr_in sin;
 541
 542         memset(&sin, 0, sizeof(sin));
 543         sin.sin_family = AF_INET;
 544         sin.sin_len = sizeof(struct sockaddr_in);
 545         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 546         return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
 547                 ruser, luser);
 548 }
 549
 550 /*
 551  * XXX
 552  * Don't make static, used by lpd(8).
 553  *
 554  * Returns 0 if ok, -1 if not ok.
 555  */
 556 int
 557 __ivaliduser(hostf, raddr, luser, ruser)
 558         FILE *hostf;
 559         u_int32_t raddr;
 560         const char *luser, *ruser;
 561 {
 562         struct sockaddr_in sin;
 563
 564         memset(&sin, 0, sizeof(sin));
 565         sin.sin_family = AF_INET;
 566         sin.sin_len = sizeof(struct sockaddr_in);
 567         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 568         return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
 569                 luser, ruser);
 570 }
 571
 572 /*
 573  * Returns 0 if ok, -1 if not ok.
 574  *
 575  * XXX obsolete API.
 576  */
 577 int
 578 __ivaliduser_af(hostf, raddr, luser, ruser, af, len)
 579         FILE *hostf;
 580         const void *raddr;
 581         const char *luser, *ruser;
 582         int af, len;
 583 {
 584         struct sockaddr *sa = NULL;
 585         struct sockaddr_in *sin = NULL;
 586 #ifdef INET6
 587         struct sockaddr_in6 *sin6 = NULL;
 588 #endif
 589         struct sockaddr_storage ss;
 590
 591         memset(&ss, 0, sizeof(ss));
 592         switch (af) {
 593         case AF_INET:
 594                 if (len != sizeof(sin->sin_addr))
 595                         return -1;
 596                 sin = (struct sockaddr_in *)&ss;
 597                 sin->sin_family = AF_INET;
 598                 sin->sin_len = sizeof(struct sockaddr_in);
 599                 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
 600                 break;
 601 #ifdef INET6
 602         case AF_INET6:
 603                 if (len != sizeof(sin6->sin6_addr))
 604                         return -1;
 605                 /* you will lose scope info */
 606                 sin6 = (struct sockaddr_in6 *)&ss;
 607                 sin6->sin6_family = AF_INET6;
 608                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 609                 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
 610                 break;
 611 #endif
 612         default:
 613                 return -1;
 614         }
 615
 616         sa = (struct sockaddr *)&ss;
 617         return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
 618 }
 619
 620 /*
 621  * Returns 0 if ok, -1 if not ok.
 622  */
 623 int
 624 __ivaliduser_sa(hostf, raddr, salen, luser, ruser)
 625         FILE *hostf;
 626         const struct sockaddr *raddr;
 627         socklen_t salen;
 628         const char *luser, *ruser;
 629 {
 630         register char *user, *p;
 631         int ch;
 632         char buf[MAXHOSTNAMELEN + 128];         /* host + login */
 633         char hname[MAXHOSTNAMELEN];
 634         /* Presumed guilty until proven innocent. */
 635         int userok = 0, hostok = 0;
 636 #ifdef YP
 637         char *ypdomain;
 638
 639         if (yp_get_default_domain(&ypdomain))
 640                 ypdomain = NULL;
 641 #else
 642 #define ypdomain NULL
 643 #endif
 644         /*
 645          * We try to get the hostname back for netgroup matching.
 646          * However, the .rosts file may contain IP addresses as well
 647          * as names, so a name is not always required.
 648          */
 649         getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, NI_NAMEREQD);
 650
 651         while (fgets(buf, sizeof(buf), hostf)) {
 652                 p = buf;
 653                 /* Skip lines that are too long. */
 654                 if (strchr(p, '\n') == NULL) {
 655                         while ((ch = getc(hostf)) != '\n' && ch != EOF);
 656                         continue;
 657                 }
 658                 if (*p == '\n' || *p == '#') {
 659                         /* comment... */
 660                         continue;
 661                 }
 662                 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
 663                         *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
 664                         p++;
 665                 }
 666                 if (*p == ' ' || *p == '\t') {
 667                         *p++ = '\0';
 668                         while (*p == ' ' || *p == '\t')
 669                                 p++;
 670                         user = p;
 671                         while (*p != '\n' && *p != ' ' &&
 672                             *p != '\t' && *p != '\0')
 673                                 p++;
 674                 } else
 675                         user = p;
 676                 *p = '\0';
 677                 /*
 678                  * Do +/- and +@/-@ checking. This looks really nasty,
 679                  * but it matches SunOS's behavior so far as I can tell.
 680                  */
 681                 switch(buf[0]) {
 682                 case '+':
 683                         if (!buf[1]) {     /* '+' matches all hosts */
 684                                 hostok = 1;
 685                                 break;
 686                         }
 687                         if (buf[1] == '@')  /* match a host by netgroup */
 688                                 hostok = innetgr((char *)&buf[2],
 689                                         (char *)&hname, NULL, ypdomain);
 690                         else            /* match a host by addr */
 691                                 hostok = __icheckhost(raddr, salen,
 692                                                       (char *)&buf[1]);
 693                         break;
 694                 case '-':     /* reject '-' hosts and all their users */
 695                         if (buf[1] == '@') {
 696                                 if (innetgr((char *)&buf[2],
 697                                               (char *)&hname, NULL, ypdomain))
 698                                         return(-1);
 699                         } else {
 700                                 if (__icheckhost(raddr, salen,
 701                                                  (char *)&buf[1]))
 702                                         return(-1);
 703                         }
 704                         break;
 705                 default:  /* if no '+' or '-', do a simple match */
 706                         hostok = __icheckhost(raddr, salen, buf);
 707                         break;
 708                 }
 709                 switch(*user) {
 710                 case '+':
 711                         if (!*(user+1)) {      /* '+' matches all users */
 712                                 userok = 1;
 713                                 break;
 714                         }
 715                         if (*(user+1) == '@')  /* match a user by netgroup */
 716                                 userok = innetgr(user+2, NULL, ruser, ypdomain);
 717                         else       /* match a user by direct specification */
 718                                 userok = !(strcmp(ruser, user+1));
 719                         break;
 720                 case '-':               /* if we matched a hostname, */
 721                         if (hostok) {   /* check for user field rejections */
 722                                 if (!*(user+1))
 723                                         return(-1);
 724                                 if (*(user+1) == '@') {
 725                                         if (innetgr(user+2, NULL,
 726                                                         ruser, ypdomain))
 727                                                 return(-1);
 728                                 } else {
 729                                         if (!strcmp(ruser, user+1))
 730                                                 return(-1);
 731                                 }
 732                         }
 733                         break;
 734                 default:        /* no rejections: try to match the user */
 735                         if (hostok)
 736                                 userok = !(strcmp(ruser,*user ? user : luser));
 737                         break;
 738                 }
 739                 if (hostok && userok)
 740                         return(0);
 741         }
 742         return (-1);
 743 }
 744
 745 /*
 746  * Returns "true" if match, 0 if no match.
 747  *
 748  * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion
 749  * if af == AF_INET6.
 750  */
 751 static int
 752 __icheckhost(raddr, salen, lhost)
 753         const struct sockaddr *raddr;
 754         socklen_t salen;
 755         const char *lhost;
 756 {
 757         struct sockaddr_in sin;
 758         struct sockaddr_in6 *sin6;
 759         struct addrinfo hints, *res, *r;
 760         int error;
 761         char h1[NI_MAXHOST], h2[NI_MAXHOST];
 762
 763         if (raddr->sa_family == AF_INET6) {
 764                 sin6 = (struct sockaddr_in6 *)raddr;
 765                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 766                         memset(&sin, 0, sizeof(sin));
 767                         sin.sin_family = AF_INET;
 768                         sin.sin_len = sizeof(struct sockaddr_in);
 769                         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 770                                sizeof(sin.sin_addr));
 771                         raddr = (struct sockaddr *)&sin;
 772                         salen = sin.sin_len;
 773                 }
 774         }
 775
 776         h1[0] = '\0';
 777         if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
 778                         NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 779                 return (0);
 780
 781         /* Resolve laddr into sockaddr */
 782         memset(&hints, 0, sizeof(hints));
 783         hints.ai_family = raddr->sa_family;
 784         hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
 785         res = NULL;
 786         error = getaddrinfo(lhost, "0", &hints, &res);
 787         if (error)
 788                 return (0);
 789
 790         for (r = res; r ; r = r->ai_next) {
 791                 h2[0] = '\0';
 792                 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
 793                                 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 794                         continue;
 795                 if (strcmp(h1, h2) == 0) {
 796                         freeaddrinfo(res);
 797                         return (1);
 798                 }
 799         }
 800
 801         /* No match. */
 802         freeaddrinfo(res);
 803         return (0);
 804 }