1 /* 2 * Copyright (c) 1983, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/lib/libc/net/rcmd.c,v 1.23.2.7 2002/08/26 16:17:49 jdp Exp $ 34 * $DragonFly: src/lib/libc/net/rcmd.c,v 1.4 2004/10/25 19:38:01 drhodus Exp $ 35 * 36 * @(#)rcmd.c 8.3 (Berkeley) 3/26/94 37 */ 38 39 #include <sys/param.h> 40 #include <sys/socket.h> 41 #include <sys/stat.h> 42 43 #include <netinet/in.h> 44 #include <arpa/inet.h> 45 46 #include <signal.h> 47 #include <fcntl.h> 48 #include <netdb.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #include <pwd.h> 52 #include <errno.h> 53 #include <stdio.h> 54 #include <ctype.h> 55 #include <string.h> 56 #ifdef YP 57 #include <rpc/rpc.h> 58 #include <rpcsvc/yp_prot.h> 59 #include <rpcsvc/ypclnt.h> 60 #endif 61 #include <arpa/nameser.h> 62 63 /* wrapper for KAME-special getnameinfo() */ 64 #ifndef NI_WITHSCOPEID 65 #define NI_WITHSCOPEID 0 66 #endif 67 68 extern int innetgr ( const char *, const char *, const char *, const char * ); 69 70 #define max(a, b) ((a > b) ? a : b) 71 72 int __ivaliduser (FILE *, u_int32_t, const char *, const char *); 73 int __ivaliduser_af (FILE *,const void *, const char *, const char *, 74 int, int); 75 int __ivaliduser_sa (FILE *, const struct sockaddr *, socklen_t, 76 const char *,const char *); 77 static int __icheckhost (const struct sockaddr *, socklen_t, 78 const char *); 79 80 char paddr[NI_MAXHOST]; 81 82 int 83 rcmd(ahost, rport, locuser, remuser, cmd, fd2p) 84 char **ahost; 85 u_short rport; 86 const char *locuser, *remuser, *cmd; 87 int *fd2p; 88 { 89 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 90 } 91 92 int 93 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) 94 char **ahost; 95 u_short rport; 96 const char *locuser, *remuser, *cmd; 97 int *fd2p; 98 int af; 99 { 100 struct addrinfo hints, *res, *ai; 101 struct sockaddr_storage from; 102 fd_set reads; 103 long oldmask; 104 pid_t pid; 105 int s, aport, lport, timo, error; 106 char c, *p; 107 int refused, nres; 108 char num[8]; 109 static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 110 111 /* call rcmdsh() with specified remote shell if appropriate. */ 112 if (!issetugid() && (p = getenv("RSH"))) { 113 struct servent *sp = getservbyname("shell", "tcp"); 114 115 if (sp && sp->s_port == rport) 116 return (rcmdsh(ahost, rport, locuser, remuser, 117 cmd, p)); 118 } 119 120 /* use rsh(1) if non-root and remote port is shell. */ 121 if (geteuid()) { 122 struct servent *sp = getservbyname("shell", "tcp"); 123 124 if (sp && sp->s_port == rport) 125 return (rcmdsh(ahost, rport, locuser, remuser, 126 cmd, NULL)); 127 } 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 lport--; 224 if (fd2p == 0) { 225 _write(s, "", 1); 226 lport = 0; 227 } else { 228 char num[8]; 229 int s2 = rresvport_af(&lport, ai->ai_family), s3; 230 int len = ai->ai_addrlen; 231 int nfds; 232 233 if (s2 < 0) 234 goto bad; 235 listen(s2, 1); 236 (void)snprintf(num, sizeof(num), "%d", lport); 237 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 238 (void)fprintf(stderr, 239 "rcmd: write (setting up stderr): %s\n", 240 strerror(errno)); 241 (void)_close(s2); 242 goto bad; 243 } 244 nfds = max(s, s2)+1; 245 if(nfds > FD_SETSIZE) { 246 fprintf(stderr, "rcmd: too many files\n"); 247 (void)_close(s2); 248 goto bad; 249 } 250 again: 251 FD_ZERO(&reads); 252 FD_SET(s, &reads); 253 FD_SET(s2, &reads); 254 errno = 0; 255 if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 256 if (errno != 0) 257 (void)fprintf(stderr, 258 "rcmd: select (setting up stderr): %s\n", 259 strerror(errno)); 260 else 261 (void)fprintf(stderr, 262 "select: protocol failure in circuit setup\n"); 263 (void)_close(s2); 264 goto bad; 265 } 266 s3 = accept(s2, (struct sockaddr *)&from, &len); 267 switch (from.ss_family) { 268 case AF_INET: 269 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 270 break; 271 #ifdef INET6 272 case AF_INET6: 273 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 274 break; 275 #endif 276 default: 277 aport = 0; /* error */ 278 break; 279 } 280 /* 281 * XXX careful for ftp bounce attacks. If discovered, shut them 282 * down and check for the real auxiliary channel to connect. 283 */ 284 if (aport == 20) { 285 _close(s3); 286 goto again; 287 } 288 (void)_close(s2); 289 if (s3 < 0) { 290 (void)fprintf(stderr, 291 "rcmd: accept: %s\n", strerror(errno)); 292 lport = 0; 293 goto bad; 294 } 295 *fd2p = s3; 296 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 297 (void)fprintf(stderr, 298 "socket: protocol failure in circuit setup.\n"); 299 goto bad2; 300 } 301 } 302 (void)_write(s, locuser, strlen(locuser)+1); 303 (void)_write(s, remuser, strlen(remuser)+1); 304 (void)_write(s, cmd, strlen(cmd)+1); 305 if (_read(s, &c, 1) != 1) { 306 (void)fprintf(stderr, 307 "rcmd: %s: %s\n", *ahost, strerror(errno)); 308 goto bad2; 309 } 310 if (c != 0) { 311 while (_read(s, &c, 1) == 1) { 312 (void)_write(STDERR_FILENO, &c, 1); 313 if (c == '\n') 314 break; 315 } 316 goto bad2; 317 } 318 sigsetmask(oldmask); 319 freeaddrinfo(res); 320 return (s); 321 bad2: 322 if (lport) 323 (void)_close(*fd2p); 324 bad: 325 (void)_close(s); 326 sigsetmask(oldmask); 327 freeaddrinfo(res); 328 return (-1); 329 } 330 331 int 332 rresvport(port) 333 int *port; 334 { 335 return rresvport_af(port, AF_INET); 336 } 337 338 int 339 rresvport_af(alport, family) 340 int *alport, family; 341 { 342 int i, s, len, err; 343 struct sockaddr_storage ss; 344 u_short *sport; 345 346 memset(&ss, 0, sizeof(ss)); 347 ss.ss_family = family; 348 switch (family) { 349 case AF_INET: 350 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 351 sport = &((struct sockaddr_in *)&ss)->sin_port; 352 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 353 break; 354 #ifdef INET6 355 case AF_INET6: 356 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 357 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 358 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 359 break; 360 #endif 361 default: 362 errno = EAFNOSUPPORT; 363 return -1; 364 } 365 366 s = socket(ss.ss_family, SOCK_STREAM, 0); 367 if (s < 0) 368 return (-1); 369 #if 0 /* compat_exact_traditional_rresvport_semantics */ 370 sin.sin_port = htons((u_short)*alport); 371 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 372 return (s); 373 if (errno != EADDRINUSE) { 374 (void)_close(s); 375 return (-1); 376 } 377 #endif 378 *sport = 0; 379 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 380 (void)_close(s); 381 return (-1); 382 } 383 *alport = (int)ntohs(*sport); 384 return (s); 385 } 386 387 int __check_rhosts_file = 1; 388 char *__rcmd_errstr; 389 390 int 391 ruserok(rhost, superuser, ruser, luser) 392 const char *rhost, *ruser, *luser; 393 int superuser; 394 { 395 struct addrinfo hints, *res, *r; 396 int error; 397 398 memset(&hints, 0, sizeof(hints)); 399 hints.ai_family = PF_UNSPEC; 400 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 401 error = getaddrinfo(rhost, "0", &hints, &res); 402 if (error) 403 return (-1); 404 405 for (r = res; r; r = r->ai_next) { 406 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 407 luser) == 0) { 408 freeaddrinfo(res); 409 return (0); 410 } 411 } 412 freeaddrinfo(res); 413 return (-1); 414 } 415 416 /* 417 * New .rhosts strategy: We are passed an ip address. We spin through 418 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 419 * has ip addresses, we don't have to trust a nameserver. When it 420 * contains hostnames, we spin through the list of addresses the nameserver 421 * gives us and look for a match. 422 * 423 * Returns 0 if ok, -1 if not ok. 424 */ 425 int 426 iruserok(raddr, superuser, ruser, luser) 427 unsigned long raddr; 428 int superuser; 429 const char *ruser, *luser; 430 { 431 struct sockaddr_in sin; 432 433 memset(&sin, 0, sizeof(sin)); 434 sin.sin_family = AF_INET; 435 sin.sin_len = sizeof(struct sockaddr_in); 436 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 437 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 438 ruser, luser); 439 } 440 441 /* 442 * AF independent extension of iruserok. 443 * 444 * Returns 0 if ok, -1 if not ok. 445 */ 446 int 447 iruserok_sa(ra, rlen, superuser, ruser, luser) 448 const void *ra; 449 int rlen; 450 int superuser; 451 const char *ruser, *luser; 452 { 453 char *cp; 454 struct stat sbuf; 455 struct passwd *pwd; 456 FILE *hostf; 457 uid_t uid; 458 int first; 459 char pbuf[MAXPATHLEN]; 460 const struct sockaddr *raddr; 461 struct sockaddr_storage ss; 462 463 /* avoid alignment issue */ 464 if (rlen > sizeof(ss)) 465 return(-1); 466 memcpy(&ss, ra, rlen); 467 raddr = (struct sockaddr *)&ss; 468 469 first = 1; 470 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 471 again: 472 if (hostf) { 473 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 474 (void)fclose(hostf); 475 return (0); 476 } 477 (void)fclose(hostf); 478 } 479 if (first == 1 && (__check_rhosts_file || superuser)) { 480 first = 0; 481 if ((pwd = getpwnam(luser)) == NULL) 482 return (-1); 483 (void)strcpy(pbuf, pwd->pw_dir); 484 (void)strcat(pbuf, "/.rhosts"); 485 486 /* 487 * Change effective uid while opening .rhosts. If root and 488 * reading an NFS mounted file system, can't read files that 489 * are protected read/write owner only. 490 */ 491 uid = geteuid(); 492 (void)seteuid(pwd->pw_uid); 493 hostf = fopen(pbuf, "r"); 494 (void)seteuid(uid); 495 496 if (hostf == NULL) 497 return (-1); 498 /* 499 * If not a regular file, or is owned by someone other than 500 * user or root or if writeable by anyone but the owner, quit. 501 */ 502 cp = NULL; 503 if (lstat(pbuf, &sbuf) < 0) 504 cp = ".rhosts lstat failed"; 505 else if (!S_ISREG(sbuf.st_mode)) 506 cp = ".rhosts not regular file"; 507 else if (fstat(fileno(hostf), &sbuf) < 0) 508 cp = ".rhosts fstat failed"; 509 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 510 cp = "bad .rhosts owner"; 511 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 512 cp = ".rhosts writeable by other than owner"; 513 /* If there were any problems, quit. */ 514 if (cp) { 515 __rcmd_errstr = cp; 516 (void)fclose(hostf); 517 return (-1); 518 } 519 goto again; 520 } 521 return (-1); 522 } 523 524 /* 525 * XXX 526 * Don't make static, used by lpd(8). 527 * 528 * Returns 0 if ok, -1 if not ok. 529 */ 530 int 531 __ivaliduser(hostf, raddr, luser, ruser) 532 FILE *hostf; 533 u_int32_t raddr; 534 const char *luser, *ruser; 535 { 536 struct sockaddr_in sin; 537 538 memset(&sin, 0, sizeof(sin)); 539 sin.sin_family = AF_INET; 540 sin.sin_len = sizeof(struct sockaddr_in); 541 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 542 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 543 luser, ruser); 544 } 545 546 /* 547 * Returns 0 if ok, -1 if not ok. 548 * 549 * XXX obsolete API. 550 */ 551 int 552 __ivaliduser_af(hostf, raddr, luser, ruser, af, len) 553 FILE *hostf; 554 const void *raddr; 555 const char *luser, *ruser; 556 int af, len; 557 { 558 struct sockaddr *sa = NULL; 559 struct sockaddr_in *sin = NULL; 560 #ifdef INET6 561 struct sockaddr_in6 *sin6 = NULL; 562 #endif 563 struct sockaddr_storage ss; 564 565 memset(&ss, 0, sizeof(ss)); 566 switch (af) { 567 case AF_INET: 568 if (len != sizeof(sin->sin_addr)) 569 return -1; 570 sin = (struct sockaddr_in *)&ss; 571 sin->sin_family = AF_INET; 572 sin->sin_len = sizeof(struct sockaddr_in); 573 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 574 break; 575 #ifdef INET6 576 case AF_INET6: 577 if (len != sizeof(sin6->sin6_addr)) 578 return -1; 579 /* you will lose scope info */ 580 sin6 = (struct sockaddr_in6 *)&ss; 581 sin6->sin6_family = AF_INET6; 582 sin6->sin6_len = sizeof(struct sockaddr_in6); 583 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 584 break; 585 #endif 586 default: 587 return -1; 588 } 589 590 sa = (struct sockaddr *)&ss; 591 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 592 } 593 594 /* 595 * Returns 0 if ok, -1 if not ok. 596 */ 597 int 598 __ivaliduser_sa(hostf, raddr, salen, luser, ruser) 599 FILE *hostf; 600 const struct sockaddr *raddr; 601 socklen_t salen; 602 const char *luser, *ruser; 603 { 604 char *user, *p; 605 int ch; 606 char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 607 char hname[MAXHOSTNAMELEN]; 608 /* Presumed guilty until proven innocent. */ 609 int userok = 0, hostok = 0; 610 int h_error; 611 #ifdef YP 612 char *ypdomain; 613 614 if (yp_get_default_domain(&ypdomain)) 615 ypdomain = NULL; 616 #else 617 #define ypdomain NULL 618 #endif 619 /* We need to get the damn hostname back for netgroup matching. */ 620 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 621 NI_NAMEREQD) != 0) 622 hname[0] = '\0'; 623 624 while (fgets(buf, sizeof(buf), hostf)) { 625 p = buf; 626 /* Skip lines that are too long. */ 627 if (strchr(p, '\n') == NULL) { 628 while ((ch = getc(hostf)) != '\n' && ch != EOF); 629 continue; 630 } 631 if (*p == '\n' || *p == '#') { 632 /* comment... */ 633 continue; 634 } 635 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 636 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 637 p++; 638 } 639 if (*p == ' ' || *p == '\t') { 640 *p++ = '\0'; 641 while (*p == ' ' || *p == '\t') 642 p++; 643 user = p; 644 while (*p != '\n' && *p != ' ' && 645 *p != '\t' && *p != '\0') 646 p++; 647 } else 648 user = p; 649 *p = '\0'; 650 /* 651 * Do +/- and +@/-@ checking. This looks really nasty, 652 * but it matches SunOS's behavior so far as I can tell. 653 */ 654 switch(buf[0]) { 655 case '+': 656 if (!buf[1]) { /* '+' matches all hosts */ 657 hostok = 1; 658 break; 659 } 660 if (buf[1] == '@') /* match a host by netgroup */ 661 hostok = hname[0] != '\0' && 662 innetgr(&buf[2], hname, NULL, ypdomain); 663 else /* match a host by addr */ 664 hostok = __icheckhost(raddr, salen, 665 (char *)&buf[1]); 666 break; 667 case '-': /* reject '-' hosts and all their users */ 668 if (buf[1] == '@') { 669 if (hname[0] == '\0' || 670 innetgr(&buf[2], hname, NULL, ypdomain)) 671 return(-1); 672 } else { 673 if (__icheckhost(raddr, salen, 674 (char *)&buf[1])) 675 return(-1); 676 } 677 break; 678 default: /* if no '+' or '-', do a simple match */ 679 hostok = __icheckhost(raddr, salen, buf); 680 break; 681 } 682 switch(*user) { 683 case '+': 684 if (!*(user+1)) { /* '+' matches all users */ 685 userok = 1; 686 break; 687 } 688 if (*(user+1) == '@') /* match a user by netgroup */ 689 userok = innetgr(user+2, NULL, ruser, ypdomain); 690 else /* match a user by direct specification */ 691 userok = !(strcmp(ruser, user+1)); 692 break; 693 case '-': /* if we matched a hostname, */ 694 if (hostok) { /* check for user field rejections */ 695 if (!*(user+1)) 696 return(-1); 697 if (*(user+1) == '@') { 698 if (innetgr(user+2, NULL, 699 ruser, ypdomain)) 700 return(-1); 701 } else { 702 if (!strcmp(ruser, user+1)) 703 return(-1); 704 } 705 } 706 break; 707 default: /* no rejections: try to match the user */ 708 if (hostok) 709 userok = !(strcmp(ruser,*user ? user : luser)); 710 break; 711 } 712 if (hostok && userok) 713 return(0); 714 } 715 return (-1); 716 } 717 718 /* 719 * Returns "true" if match, 0 if no match. 720 * 721 * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion 722 * if af == AF_INET6. 723 */ 724 static int 725 __icheckhost(raddr, salen, lhost) 726 const struct sockaddr *raddr; 727 socklen_t salen; 728 const char *lhost; 729 { 730 struct sockaddr_in sin; 731 struct sockaddr_in6 *sin6; 732 struct addrinfo hints, *res, *r; 733 int error; 734 char h1[NI_MAXHOST], h2[NI_MAXHOST]; 735 736 if (raddr->sa_family == AF_INET6) { 737 sin6 = (struct sockaddr_in6 *)raddr; 738 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 739 memset(&sin, 0, sizeof(sin)); 740 sin.sin_family = AF_INET; 741 sin.sin_len = sizeof(struct sockaddr_in); 742 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 743 sizeof(sin.sin_addr)); 744 raddr = (struct sockaddr *)&sin; 745 salen = sin.sin_len; 746 } 747 } 748 749 h1[0] = '\0'; 750 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 751 NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 752 return (0); 753 754 /* Resolve laddr into sockaddr */ 755 memset(&hints, 0, sizeof(hints)); 756 hints.ai_family = raddr->sa_family; 757 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 758 res = NULL; 759 error = getaddrinfo(lhost, "0", &hints, &res); 760 if (error) 761 return (0); 762 763 for (r = res; r ; r = r->ai_next) { 764 h2[0] = '\0'; 765 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 766 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 767 continue; 768 if (strcmp(h1, h2) == 0) { 769 freeaddrinfo(res); 770 return (1); 771 } 772 } 773 774 /* No match. */ 775 freeaddrinfo(res); 776 return (0); 777 } 778