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