1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 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(char **ahost, int rport, const char *locuser, const char *remuser, 77 const char *cmd, int *fd2p) 78 { 79 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 80 } 81 82 int 83 rcmd_af(char **ahost, int rport, const char *locuser, const char *remuser, 84 const char *cmd, int *fd2p, int af) 85 { 86 struct addrinfo hints, *res, *ai; 87 struct sockaddr_storage from; 88 fd_set reads; 89 sigset_t oldmask, newmask; 90 pid_t pid; 91 int s, aport, lport, timo, error; 92 char c, *p; 93 int refused, nres; 94 char num[8]; 95 static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 96 97 /* call rcmdsh() with specified remote shell if appropriate. */ 98 if ((p = secure_getenv("RSH")) != NULL) { 99 struct servent *sp = getservbyname("shell", "tcp"); 100 101 if (sp && sp->s_port == rport) 102 return (rcmdsh(ahost, rport, locuser, remuser, 103 cmd, p)); 104 } 105 106 /* use rsh(1) if non-root and remote port is shell. */ 107 if (geteuid()) { 108 struct servent *sp = getservbyname("shell", "tcp"); 109 110 if (sp && sp->s_port == rport) 111 return (rcmdsh(ahost, rport, locuser, remuser, 112 cmd, NULL)); 113 } 114 115 pid = getpid(); 116 117 memset(&hints, 0, sizeof(hints)); 118 hints.ai_flags = AI_CANONNAME; 119 hints.ai_family = af; 120 hints.ai_socktype = SOCK_STREAM; 121 hints.ai_protocol = 0; 122 (void)snprintf(num, sizeof(num), "%d", ntohs(rport)); 123 error = getaddrinfo(*ahost, num, &hints, &res); 124 if (error) { 125 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 126 gai_strerror(error)); 127 if (error == EAI_SYSTEM) 128 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 129 strerror(errno)); 130 return (-1); 131 } 132 133 if (res->ai_canonname 134 && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 135 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 136 *ahost = canonnamebuf; 137 } 138 nres = 0; 139 for (ai = res; ai; ai = ai->ai_next) 140 nres++; 141 ai = res; 142 refused = 0; 143 sigemptyset(&newmask); 144 sigaddset(&newmask, SIGURG); 145 __libc_sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 146 for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 147 s = rresvport_af(&lport, ai->ai_family); 148 if (s < 0) { 149 if (errno != EAGAIN && ai->ai_next) { 150 ai = ai->ai_next; 151 continue; 152 } 153 if (errno == EAGAIN) 154 (void)fprintf(stderr, 155 "rcmd: socket: All ports in use\n"); 156 else 157 (void)fprintf(stderr, "rcmd: socket: %s\n", 158 strerror(errno)); 159 freeaddrinfo(res); 160 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 161 NULL); 162 return (-1); 163 } 164 _fcntl(s, F_SETOWN, pid); 165 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 166 break; 167 (void)_close(s); 168 if (errno == EADDRINUSE) { 169 lport--; 170 continue; 171 } 172 if (errno == ECONNREFUSED) 173 refused = 1; 174 if (ai->ai_next == NULL && (!refused || timo > 16)) { 175 (void)fprintf(stderr, "%s: %s\n", 176 *ahost, strerror(errno)); 177 freeaddrinfo(res); 178 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 179 NULL); 180 return (-1); 181 } 182 if (nres > 1) { 183 int oerrno = errno; 184 185 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr, 186 sizeof(paddr), NULL, 0, NI_NUMERICHOST); 187 (void)fprintf(stderr, "connect to address %s: ", 188 paddr); 189 errno = oerrno; 190 perror(0); 191 } 192 if ((ai = ai->ai_next) == NULL) { 193 /* refused && timo <= 16 */ 194 struct timespec time_to_sleep, time_remaining; 195 196 time_to_sleep.tv_sec = timo; 197 time_to_sleep.tv_nsec = 0; 198 (void)_nanosleep(&time_to_sleep, &time_remaining); 199 timo *= 2; 200 ai = res; 201 refused = 0; 202 } 203 if (nres > 1) { 204 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr, 205 sizeof(paddr), NULL, 0, NI_NUMERICHOST); 206 fprintf(stderr, "Trying %s...\n", paddr); 207 } 208 } 209 lport--; 210 if (fd2p == NULL) { 211 _write(s, "", 1); 212 lport = 0; 213 } else { 214 int s2 = rresvport_af(&lport, ai->ai_family), s3; 215 socklen_t len = ai->ai_addrlen; 216 int nfds; 217 218 if (s2 < 0) 219 goto bad; 220 _listen(s2, 1); 221 (void)snprintf(num, sizeof(num), "%d", lport); 222 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 223 (void)fprintf(stderr, 224 "rcmd: write (setting up stderr): %s\n", 225 strerror(errno)); 226 (void)_close(s2); 227 goto bad; 228 } 229 nfds = max(s, s2)+1; 230 if(nfds > FD_SETSIZE) { 231 fprintf(stderr, "rcmd: too many files\n"); 232 (void)_close(s2); 233 goto bad; 234 } 235 again: 236 FD_ZERO(&reads); 237 FD_SET(s, &reads); 238 FD_SET(s2, &reads); 239 errno = 0; 240 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 241 if (errno != 0) 242 (void)fprintf(stderr, 243 "rcmd: select (setting up stderr): %s\n", 244 strerror(errno)); 245 else 246 (void)fprintf(stderr, 247 "select: protocol failure in circuit setup\n"); 248 (void)_close(s2); 249 goto bad; 250 } 251 s3 = _accept(s2, (struct sockaddr *)&from, &len); 252 switch (from.ss_family) { 253 case AF_INET: 254 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 255 break; 256 #ifdef INET6 257 case AF_INET6: 258 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 259 break; 260 #endif 261 default: 262 aport = 0; /* error */ 263 break; 264 } 265 /* 266 * XXX careful for ftp bounce attacks. If discovered, shut them 267 * down and check for the real auxiliary channel to connect. 268 */ 269 if (aport == 20) { 270 _close(s3); 271 goto again; 272 } 273 (void)_close(s2); 274 if (s3 < 0) { 275 (void)fprintf(stderr, 276 "rcmd: accept: %s\n", strerror(errno)); 277 lport = 0; 278 goto bad; 279 } 280 *fd2p = s3; 281 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 282 (void)fprintf(stderr, 283 "socket: protocol failure in circuit setup.\n"); 284 goto bad2; 285 } 286 } 287 (void)_write(s, locuser, strlen(locuser)+1); 288 (void)_write(s, remuser, strlen(remuser)+1); 289 (void)_write(s, cmd, strlen(cmd)+1); 290 if (_read(s, &c, 1) != 1) { 291 (void)fprintf(stderr, 292 "rcmd: %s: %s\n", *ahost, strerror(errno)); 293 goto bad2; 294 } 295 if (c != 0) { 296 while (_read(s, &c, 1) == 1) { 297 (void)_write(STDERR_FILENO, &c, 1); 298 if (c == '\n') 299 break; 300 } 301 goto bad2; 302 } 303 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 304 freeaddrinfo(res); 305 return (s); 306 bad2: 307 if (lport) 308 (void)_close(*fd2p); 309 bad: 310 (void)_close(s); 311 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 312 freeaddrinfo(res); 313 return (-1); 314 } 315 316 int 317 rresvport(int *port) 318 { 319 return rresvport_af(port, AF_INET); 320 } 321 322 int 323 rresvport_af(int *alport, int family) 324 { 325 int s; 326 struct sockaddr_storage ss; 327 u_short *sport; 328 329 memset(&ss, 0, sizeof(ss)); 330 ss.ss_family = family; 331 switch (family) { 332 case AF_INET: 333 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 334 sport = &((struct sockaddr_in *)&ss)->sin_port; 335 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 336 break; 337 #ifdef INET6 338 case AF_INET6: 339 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 340 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 341 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 342 break; 343 #endif 344 default: 345 errno = EAFNOSUPPORT; 346 return -1; 347 } 348 349 s = _socket(ss.ss_family, SOCK_STREAM, 0); 350 if (s < 0) 351 return (-1); 352 #if 0 /* compat_exact_traditional_rresvport_semantics */ 353 sin.sin_port = htons((u_short)*alport); 354 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 355 return (s); 356 if (errno != EADDRINUSE) { 357 (void)_close(s); 358 return (-1); 359 } 360 #endif 361 *sport = 0; 362 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 363 (void)_close(s); 364 return (-1); 365 } 366 *alport = (int)ntohs(*sport); 367 return (s); 368 } 369 370 int __check_rhosts_file = 1; 371 char *__rcmd_errstr; 372 373 int 374 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser) 375 { 376 struct addrinfo hints, *res, *r; 377 int error; 378 379 memset(&hints, 0, sizeof(hints)); 380 hints.ai_family = PF_UNSPEC; 381 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 382 error = getaddrinfo(rhost, "0", &hints, &res); 383 if (error) 384 return (-1); 385 386 for (r = res; r; r = r->ai_next) { 387 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 388 luser) == 0) { 389 freeaddrinfo(res); 390 return (0); 391 } 392 } 393 freeaddrinfo(res); 394 return (-1); 395 } 396 397 /* 398 * New .rhosts strategy: We are passed an ip address. We spin through 399 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 400 * has ip addresses, we don't have to trust a nameserver. When it 401 * contains hostnames, we spin through the list of addresses the nameserver 402 * gives us and look for a match. 403 * 404 * Returns 0 if ok, -1 if not ok. 405 */ 406 int 407 iruserok(unsigned long raddr, int superuser, const char *ruser, const char *luser) 408 { 409 struct sockaddr_in sin; 410 411 memset(&sin, 0, sizeof(sin)); 412 sin.sin_family = AF_INET; 413 sin.sin_len = sizeof(struct sockaddr_in); 414 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 415 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 416 ruser, luser); 417 } 418 419 /* 420 * AF independent extension of iruserok. 421 * 422 * Returns 0 if ok, -1 if not ok. 423 */ 424 int 425 iruserok_sa(const void *ra, int rlen, int superuser, const char *ruser, 426 const char *luser) 427 { 428 char *cp; 429 struct stat sbuf; 430 struct passwd *pwd; 431 FILE *hostf; 432 uid_t uid; 433 int first; 434 char pbuf[MAXPATHLEN]; 435 const struct sockaddr *raddr; 436 struct sockaddr_storage ss; 437 438 /* avoid alignment issue */ 439 if (rlen <= 0 || rlen > sizeof(ss)) 440 return (-1); 441 memcpy(&ss, ra, rlen); 442 raddr = (struct sockaddr *)&ss; 443 444 first = 1; 445 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "re"); 446 again: 447 if (hostf) { 448 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 449 (void)fclose(hostf); 450 return (0); 451 } 452 (void)fclose(hostf); 453 } 454 if (first == 1 && (__check_rhosts_file || superuser)) { 455 first = 0; 456 if ((pwd = getpwnam(luser)) == NULL) 457 return (-1); 458 (void)strlcpy(pbuf, pwd->pw_dir, sizeof(pbuf)); 459 (void)strlcat(pbuf, "/.rhosts", sizeof(pbuf)); 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, "re"); 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 /* 500 * XXX 501 * Don't make static, used by lpd(8). 502 * 503 * Returns 0 if ok, -1 if not ok. 504 */ 505 int 506 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser) 507 { 508 struct sockaddr_in sin; 509 510 memset(&sin, 0, sizeof(sin)); 511 sin.sin_family = AF_INET; 512 sin.sin_len = sizeof(struct sockaddr_in); 513 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 514 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 515 luser, ruser); 516 } 517 518 /* 519 * Returns 0 if ok, -1 if not ok. 520 * 521 * XXX obsolete API. 522 */ 523 int 524 __ivaliduser_af(FILE *hostf, const void *raddr, const char *luser, 525 const char *ruser, int af, int len) 526 { 527 struct sockaddr *sa = NULL; 528 struct sockaddr_in *sin = NULL; 529 #ifdef INET6 530 struct sockaddr_in6 *sin6 = NULL; 531 #endif 532 struct sockaddr_storage ss; 533 534 memset(&ss, 0, sizeof(ss)); 535 switch (af) { 536 case AF_INET: 537 if (len != sizeof(sin->sin_addr)) 538 return -1; 539 sin = (struct sockaddr_in *)&ss; 540 sin->sin_family = AF_INET; 541 sin->sin_len = sizeof(struct sockaddr_in); 542 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 543 break; 544 #ifdef INET6 545 case AF_INET6: 546 if (len != sizeof(sin6->sin6_addr)) 547 return -1; 548 /* you will lose scope info */ 549 sin6 = (struct sockaddr_in6 *)&ss; 550 sin6->sin6_family = AF_INET6; 551 sin6->sin6_len = sizeof(struct sockaddr_in6); 552 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 553 break; 554 #endif 555 default: 556 return -1; 557 } 558 559 sa = (struct sockaddr *)&ss; 560 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 561 } 562 563 int 564 __ivaliduser_sa(FILE *hostf, const struct sockaddr *raddr, socklen_t salen, 565 const char *luser, const char *ruser) 566 { 567 char *user, *p; 568 int ch; 569 char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 570 char hname[MAXHOSTNAMELEN]; 571 /* Presumed guilty until proven innocent. */ 572 int userok = 0, hostok = 0; 573 #ifdef YP 574 char *ypdomain; 575 576 if (yp_get_default_domain(&ypdomain)) 577 ypdomain = NULL; 578 #else 579 #define ypdomain NULL 580 #endif 581 /* We need to get the damn hostname back for netgroup matching. */ 582 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 583 NI_NAMEREQD) != 0) 584 hname[0] = '\0'; 585 586 while (fgets(buf, sizeof(buf), hostf)) { 587 p = buf; 588 /* Skip lines that are too long. */ 589 if (strchr(p, '\n') == NULL) { 590 while ((ch = getc(hostf)) != '\n' && ch != EOF); 591 continue; 592 } 593 if (*p == '\n' || *p == '#') { 594 /* comment... */ 595 continue; 596 } 597 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 598 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 599 p++; 600 } 601 if (*p == ' ' || *p == '\t') { 602 *p++ = '\0'; 603 while (*p == ' ' || *p == '\t') 604 p++; 605 user = p; 606 while (*p != '\n' && *p != ' ' && 607 *p != '\t' && *p != '\0') 608 p++; 609 } else 610 user = p; 611 *p = '\0'; 612 /* 613 * Do +/- and +@/-@ checking. This looks really nasty, 614 * but it matches SunOS's behavior so far as I can tell. 615 */ 616 switch(buf[0]) { 617 case '+': 618 if (!buf[1]) { /* '+' matches all hosts */ 619 hostok = 1; 620 break; 621 } 622 if (buf[1] == '@') /* match a host by netgroup */ 623 hostok = hname[0] != '\0' && 624 innetgr(&buf[2], hname, NULL, ypdomain); 625 else /* match a host by addr */ 626 hostok = __icheckhost(raddr, salen, 627 (char *)&buf[1]); 628 break; 629 case '-': /* reject '-' hosts and all their users */ 630 if (buf[1] == '@') { 631 if (hname[0] == '\0' || 632 innetgr(&buf[2], hname, NULL, ypdomain)) 633 return(-1); 634 } else { 635 if (__icheckhost(raddr, salen, 636 (char *)&buf[1])) 637 return(-1); 638 } 639 break; 640 default: /* if no '+' or '-', do a simple match */ 641 hostok = __icheckhost(raddr, salen, buf); 642 break; 643 } 644 switch(*user) { 645 case '+': 646 if (!*(user+1)) { /* '+' matches all users */ 647 userok = 1; 648 break; 649 } 650 if (*(user+1) == '@') /* match a user by netgroup */ 651 userok = innetgr(user+2, NULL, ruser, ypdomain); 652 else /* match a user by direct specification */ 653 userok = !(strcmp(ruser, user+1)); 654 break; 655 case '-': /* if we matched a hostname, */ 656 if (hostok) { /* check for user field rejections */ 657 if (!*(user+1)) 658 return(-1); 659 if (*(user+1) == '@') { 660 if (innetgr(user+2, NULL, 661 ruser, ypdomain)) 662 return(-1); 663 } else { 664 if (!strcmp(ruser, user+1)) 665 return(-1); 666 } 667 } 668 break; 669 default: /* no rejections: try to match the user */ 670 if (hostok) 671 userok = !(strcmp(ruser,*user ? user : luser)); 672 break; 673 } 674 if (hostok && userok) 675 return(0); 676 } 677 return (-1); 678 } 679 680 /* 681 * Returns "true" if match, 0 if no match. 682 */ 683 static int 684 __icheckhost(const struct sockaddr *raddr, socklen_t salen, const char *lhost) 685 { 686 struct sockaddr_in sin; 687 struct sockaddr_in6 *sin6; 688 struct addrinfo hints, *res, *r; 689 int error; 690 char h1[NI_MAXHOST], h2[NI_MAXHOST]; 691 692 if (raddr->sa_family == AF_INET6) { 693 sin6 = (struct sockaddr_in6 *)raddr; 694 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 695 memset(&sin, 0, sizeof(sin)); 696 sin.sin_family = AF_INET; 697 sin.sin_len = sizeof(struct sockaddr_in); 698 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 699 sizeof(sin.sin_addr)); 700 raddr = (struct sockaddr *)&sin; 701 salen = sin.sin_len; 702 } 703 } 704 705 h1[0] = '\0'; 706 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 707 NI_NUMERICHOST) != 0) 708 return (0); 709 710 /* Resolve laddr into sockaddr */ 711 memset(&hints, 0, sizeof(hints)); 712 hints.ai_family = raddr->sa_family; 713 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 714 res = NULL; 715 error = getaddrinfo(lhost, "0", &hints, &res); 716 if (error) 717 return (0); 718 719 for (r = res; r ; r = r->ai_next) { 720 h2[0] = '\0'; 721 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 722 NULL, 0, NI_NUMERICHOST) != 0) 723 continue; 724 if (strcmp(h1, h2) == 0) { 725 freeaddrinfo(res); 726 return (1); 727 } 728 } 729 730 /* No match. */ 731 freeaddrinfo(res); 732 return (0); 733 } 734