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
  87 #include <arpa/nameser_compat.h>
  88 #include <nameser.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                 unsigned 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 /*  Guess at the size of a password buffer for getpwnam_r (see lookup.subproj/lu_group.c) */
 409 #define MAXPWBUF (MAXLOGNAME + 1 + _PASSWORD_LEN + 1 + MAXPATHLEN + 1 + MAXPATHLEN + 1 + 4098)
 410
 411 /*
 412  * AF independent extension of iruserok.
 413  *
 414  * Returns 0 if ok, -1 if not ok.
 415  */
 416 int
 417 iruserok_sa(ra, rlen, superuser, ruser, luser)
 418         const void *ra;
 419         int rlen;
 420         int superuser;
 421         const char *ruser, *luser;
 422 {
 423         register char *cp;
 424         struct stat sbuf;
 425         struct passwd p, *pwd;
 426         FILE *hostf;
 427         uid_t uid;
 428         int first, status;
 429         char pbuf[MAXPATHLEN];
 430         const struct sockaddr *raddr;
 431         struct sockaddr_storage ss;
 432         char pwbuf[MAXPWBUF];
 433
 434         /* avoid alignment issue */
 435         if (rlen > sizeof(ss))
 436                 return(-1);
 437         memcpy(&ss, ra, rlen);
 438         raddr = (struct sockaddr *)&ss;
 439
 440         first = 1;
 441         hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
 442 again:
 443         if (hostf) {
 444                 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
 445                         (void)fclose(hostf);
 446                         return (0);
 447                 }
 448                 (void)fclose(hostf);
 449         }
 450         if (first == 1 && (__check_rhosts_file || superuser)) {
 451                 first = 0;
 452
 453                 memset(&p, 0, sizeof(struct passwd));
 454                 memset(pwbuf, 0, sizeof(pwbuf));
 455                 pwd = NULL;
 456
 457                 status = getpwnam_r(luser, &p, pwbuf, MAXPWBUF, &pwd);
 458                 if (status != 0) return -1;
 459
 460                 (void)strcpy(pbuf, pwd->pw_dir);
 461                 (void)strcat(pbuf, "/.rhosts");
 462
 463                 /*
 464                  * Change effective uid while opening .rhosts.  If root and
 465                  * reading an NFS mounted file system, can't read files that
 466                  * are protected read/write owner only.
 467                  */
 468                 uid = geteuid();
 469                 (void)seteuid(pwd->pw_uid);
 470                 hostf = fopen(pbuf, "r");
 471                 (void)seteuid(uid);
 472
 473                 if (hostf == NULL)
 474                         return (-1);
 475                 /*
 476                  * If not a regular file, or is owned by someone other than
 477                  * user or root or if writeable by anyone but the owner, quit.
 478                  */
 479                 cp = NULL;
 480                 if (lstat(pbuf, &sbuf) < 0)
 481                         cp = ".rhosts lstat failed";
 482                 else if (!S_ISREG(sbuf.st_mode))
 483                         cp = ".rhosts not regular file";
 484                 else if (fstat(fileno(hostf), &sbuf) < 0)
 485                         cp = ".rhosts fstat failed";
 486                 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
 487                         cp = "bad .rhosts owner";
 488                 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
 489                         cp = ".rhosts writeable by other than owner";
 490                 /* If there were any problems, quit. */
 491                 if (cp) {
 492                         __rcmd_errstr = cp;
 493                         (void)fclose(hostf);
 494                         return (-1);
 495                 }
 496                 goto again;
 497         }
 498         return (-1);
 499 }
 500
 501 int
 502 ruserok(rhost, superuser, ruser, luser)
 503         const char *rhost, *ruser, *luser;
 504         int superuser;
 505 {
 506         struct addrinfo hints, *res, *r;
 507         int error;
 508
 509         memset(&hints, 0, sizeof(hints));
 510         hints.ai_family = PF_UNSPEC;
 511         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 512         error = getaddrinfo(rhost, "0", &hints, &res);
 513         if (error)
 514                 return (-1);
 515
 516         for (r = res; r; r = r->ai_next) {
 517                 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
 518                     luser) == 0) {
 519                         freeaddrinfo(res);
 520                         return (0);
 521                 }
 522         }
 523         freeaddrinfo(res);
 524         return (-1);
 525 }
 526
 527 /*
 528  * New .rhosts strategy: We are passed an ip address. We spin through
 529  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 530  * has ip addresses, we don't have to trust a nameserver.  When it
 531  * contains hostnames, we spin through the list of addresses the nameserver
 532  * gives us and look for a match.
 533  *
 534  * Returns 0 if ok, -1 if not ok.
 535  */
 536 int
 537 iruserok(raddr, superuser, ruser, luser)
 538         unsigned long raddr;
 539         int superuser;
 540         const char *ruser, *luser;
 541 {
 542         struct sockaddr_in sin;
 543
 544         memset(&sin, 0, sizeof(sin));
 545         sin.sin_family = AF_INET;
 546         sin.sin_len = sizeof(struct sockaddr_in);
 547         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 548         return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
 549                 ruser, luser);
 550 }
 551
 552 /*
 553  * XXX
 554  * Don't make static, used by lpd(8).
 555  *
 556  * Returns 0 if ok, -1 if not ok.
 557  */
 558 int
 559 __ivaliduser(hostf, raddr, luser, ruser)
 560         FILE *hostf;
 561         u_int32_t raddr;
 562         const char *luser, *ruser;
 563 {
 564         struct sockaddr_in sin;
 565
 566         memset(&sin, 0, sizeof(sin));
 567         sin.sin_family = AF_INET;
 568         sin.sin_len = sizeof(struct sockaddr_in);
 569         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 570         return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
 571                 luser, ruser);
 572 }
 573
 574 /*
 575  * Returns 0 if ok, -1 if not ok.
 576  *
 577  * XXX obsolete API.
 578  */
 579 int
 580 __ivaliduser_af(hostf, raddr, luser, ruser, af, len)
 581         FILE *hostf;
 582         const void *raddr;
 583         const char *luser, *ruser;
 584         int af, len;
 585 {
 586         struct sockaddr *sa = NULL;
 587         struct sockaddr_in *sin = NULL;
 588 #ifdef INET6
 589         struct sockaddr_in6 *sin6 = NULL;
 590 #endif
 591         struct sockaddr_storage ss;
 592
 593         memset(&ss, 0, sizeof(ss));
 594         switch (af) {
 595         case AF_INET:
 596                 if (len != sizeof(sin->sin_addr))
 597                         return -1;
 598                 sin = (struct sockaddr_in *)&ss;
 599                 sin->sin_family = AF_INET;
 600                 sin->sin_len = sizeof(struct sockaddr_in);
 601                 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
 602                 break;
 603 #ifdef INET6
 604         case AF_INET6:
 605                 if (len != sizeof(sin6->sin6_addr))
 606                         return -1;
 607                 /* you will lose scope info */
 608                 sin6 = (struct sockaddr_in6 *)&ss;
 609                 sin6->sin6_family = AF_INET6;
 610                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 611                 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
 612                 break;
 613 #endif
 614         default:
 615                 return -1;
 616         }
 617
 618         sa = (struct sockaddr *)&ss;
 619         return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
 620 }
 621
 622 /*
 623  * Returns 0 if ok, -1 if not ok.
 624  */
 625 int
 626 __ivaliduser_sa(hostf, raddr, salen, luser, ruser)
 627         FILE *hostf;
 628         const struct sockaddr *raddr;
 629         socklen_t salen;
 630         const char *luser, *ruser;
 631 {
 632         register char *user, *p;
 633         int ch;
 634         char buf[MAXHOSTNAMELEN + 128];         /* host + login */
 635         char hname[MAXHOSTNAMELEN];
 636         /* Presumed guilty until proven innocent. */
 637         int userok = 0, hostok = 0;
 638 #ifdef YP
 639         char *ypdomain;
 640
 641         if (yp_get_default_domain(&ypdomain))
 642                 ypdomain = NULL;
 643 #else
 644 #define ypdomain NULL
 645 #endif
 646         /*
 647          * We try to get the hostname back for netgroup matching.
 648          * However, the .rosts file may contain IP addresses as well
 649          * as names, so a name is not always required.
 650          */
 651         getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, NI_NAMEREQD);
 652
 653         while (fgets(buf, sizeof(buf), hostf)) {
 654                 p = buf;
 655                 /* Skip lines that are too long. */
 656                 if (strchr(p, '\n') == NULL) {
 657                         while ((ch = getc(hostf)) != '\n' && ch != EOF);
 658                         continue;
 659                 }
 660                 if (*p == '\n' || *p == '#') {
 661                         /* comment... */
 662                         continue;
 663                 }
 664                 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
 665                         *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
 666                         p++;
 667                 }
 668                 if (*p == ' ' || *p == '\t') {
 669                         *p++ = '\0';
 670                         while (*p == ' ' || *p == '\t')
 671                                 p++;
 672                         user = p;
 673                         while (*p != '\n' && *p != ' ' &&
 674                             *p != '\t' && *p != '\0')
 675                                 p++;
 676                 } else
 677                         user = p;
 678                 *p = '\0';
 679                 /*
 680                  * Do +/- and +@/-@ checking. This looks really nasty,
 681                  * but it matches SunOS's behavior so far as I can tell.
 682                  */
 683                 switch(buf[0]) {
 684                 case '+':
 685                         if (!buf[1]) {     /* '+' matches all hosts */
 686                                 hostok = 1;
 687                                 break;
 688                         }
 689                         if (buf[1] == '@')  /* match a host by netgroup */
 690                                 hostok = innetgr((char *)&buf[2],
 691                                         (char *)&hname, NULL, ypdomain);
 692                         else            /* match a host by addr */
 693                                 hostok = __icheckhost(raddr, salen,
 694                                                       (char *)&buf[1]);
 695                         break;
 696                 case '-':     /* reject '-' hosts and all their users */
 697                         if (buf[1] == '@') {
 698                                 if (innetgr((char *)&buf[2],
 699                                               (char *)&hname, NULL, ypdomain))
 700                                         return(-1);
 701                         } else {
 702                                 if (__icheckhost(raddr, salen,
 703                                                  (char *)&buf[1]))
 704                                         return(-1);
 705                         }
 706                         break;
 707                 default:  /* if no '+' or '-', do a simple match */
 708                         hostok = __icheckhost(raddr, salen, buf);
 709                         break;
 710                 }
 711                 switch(*user) {
 712                 case '+':
 713                         if (!*(user+1)) {      /* '+' matches all users */
 714                                 userok = 1;
 715                                 break;
 716                         }
 717                         if (*(user+1) == '@')  /* match a user by netgroup */
 718                                 userok = innetgr(user+2, NULL, ruser, ypdomain);
 719                         else       /* match a user by direct specification */
 720                                 userok = !(strcmp(ruser, user+1));
 721                         break;
 722                 case '-':               /* if we matched a hostname, */
 723                         if (hostok) {   /* check for user field rejections */
 724                                 if (!*(user+1))
 725                                         return(-1);
 726                                 if (*(user+1) == '@') {
 727                                         if (innetgr(user+2, NULL,
 728                                                         ruser, ypdomain))
 729                                                 return(-1);
 730                                 } else {
 731                                         if (!strcmp(ruser, user+1))
 732                                                 return(-1);
 733                                 }
 734                         }
 735                         break;
 736                 default:        /* no rejections: try to match the user */
 737                         if (hostok)
 738                                 userok = !(strcmp(ruser,*user ? user : luser));
 739                         break;
 740                 }
 741                 if (hostok && userok)
 742                         return(0);
 743         }
 744         return (-1);
 745 }
 746
 747 /*
 748  * Returns "true" if match, 0 if no match.
 749  *
 750  * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion
 751  * if af == AF_INET6.
 752  */
 753 static int
 754 __icheckhost(raddr, salen, lhost)
 755         const struct sockaddr *raddr;
 756         socklen_t salen;
 757         const char *lhost;
 758 {
 759         struct sockaddr_in sin;
 760         struct sockaddr_in6 *sin6;
 761         struct addrinfo hints, *res, *r;
 762         int error;
 763         char h1[NI_MAXHOST], h2[NI_MAXHOST];
 764
 765         if (raddr->sa_family == AF_INET6) {
 766                 sin6 = (struct sockaddr_in6 *)raddr;
 767                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 768                         memset(&sin, 0, sizeof(sin));
 769                         sin.sin_family = AF_INET;
 770                         sin.sin_len = sizeof(struct sockaddr_in);
 771                         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 772                                sizeof(sin.sin_addr));
 773                         raddr = (struct sockaddr *)&sin;
 774                         salen = sin.sin_len;
 775                 }
 776         }
 777
 778         h1[0] = '\0';
 779         if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
 780                         NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 781                 return (0);
 782
 783         /* Resolve laddr into sockaddr */
 784         memset(&hints, 0, sizeof(hints));
 785         hints.ai_family = raddr->sa_family;
 786         hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
 787         res = NULL;
 788         error = getaddrinfo(lhost, "0", &hints, &res);
 789         if (error)
 790                 return (0);
 791
 792         for (r = res; r ; r = r->ai_next) {
 793                 h2[0] = '\0';
 794                 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
 795                                 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 796                         continue;
 797                 if (strcmp(h1, h2) == 0) {
 798                         freeaddrinfo(res);
 799                         return (1);
 800                 }
 801         }
 802
 803         /* No match. */
 804         freeaddrinfo(res);
 805         return (0);
 806 }