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