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. 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 * $FreeBSD: src/lib/libc/net/rcmd.c,v 1.23.2.7 2002/08/26 16:17:49 jdp Exp $ 30 * $DragonFly: src/lib/libc/net/rcmd.c,v 1.7 2005/11/13 02:04:47 swildner Exp $ 31 * 32 * @(#)rcmd.c 8.3 (Berkeley) 3/26/94 33 */ 34 35 #include "namespace.h" 36 #include <sys/param.h> 37 #include <sys/socket.h> 38 #include <sys/stat.h> 39 40 #include <netinet/in.h> 41 #include <arpa/inet.h> 42 43 #include <signal.h> 44 #include <fcntl.h> 45 #include <netdb.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 #include <pwd.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include <ctype.h> 52 #include <string.h> 53 #ifdef YP 54 #include <rpc/rpc.h> 55 #include <rpcsvc/yp_prot.h> 56 #include <rpcsvc/ypclnt.h> 57 #endif 58 #include <arpa/nameser.h> 59 #include "un-namespace.h" 60 61 /* wrapper for KAME-special getnameinfo() */ 62 #ifndef NI_WITHSCOPEID 63 #define NI_WITHSCOPEID 0 64 #endif 65 66 extern int innetgr ( const char *, const char *, const char *, const char * ); 67 68 #define max(a, b) ((a > b) ? a : b) 69 70 int __ivaliduser (FILE *, u_int32_t, const char *, const char *); 71 int __ivaliduser_af (FILE *,const void *, const char *, const char *, 72 int, int); 73 int __ivaliduser_sa (FILE *, const struct sockaddr *, socklen_t, 74 const char *,const char *); 75 static int __icheckhost (const struct sockaddr *, socklen_t, 76 const char *); 77 78 char paddr[NI_MAXHOST]; 79 80 int 81 rcmd(char **ahost, int rport, const char *locuser, const char *remuser, 82 const char *cmd, int *fd2p) 83 { 84 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 85 } 86 87 int 88 rcmd_af(char **ahost, int rport, const char *locuser, const char *remuser, 89 const char *cmd, int *fd2p, int af) 90 { 91 struct addrinfo hints, *res, *ai; 92 struct sockaddr_storage from; 93 fd_set reads; 94 sigset_t oldmask, newmask; 95 pid_t pid; 96 int s, aport, lport, timo, error; 97 char c, *p; 98 int refused, nres; 99 char num[8]; 100 static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 101 102 /* call rcmdsh() with specified remote shell if appropriate. */ 103 if (!issetugid() && (p = getenv("RSH"))) { 104 struct servent *sp = getservbyname("shell", "tcp"); 105 106 if (sp && sp->s_port == rport) 107 return (rcmdsh(ahost, rport, locuser, remuser, 108 cmd, p)); 109 } 110 111 /* use rsh(1) if non-root and remote port is shell. */ 112 if (geteuid()) { 113 struct servent *sp = getservbyname("shell", "tcp"); 114 115 if (sp && sp->s_port == rport) 116 return (rcmdsh(ahost, rport, locuser, remuser, 117 cmd, NULL)); 118 } 119 120 pid = getpid(); 121 122 memset(&hints, 0, sizeof(hints)); 123 hints.ai_flags = AI_CANONNAME; 124 hints.ai_family = af; 125 hints.ai_socktype = SOCK_STREAM; 126 hints.ai_protocol = 0; 127 snprintf(num, sizeof(num), "%d", ntohs(rport)); 128 error = getaddrinfo(*ahost, num, &hints, &res); 129 if (error) { 130 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 131 gai_strerror(error)); 132 if (error == EAI_SYSTEM) 133 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 134 strerror(errno)); 135 return (-1); 136 } 137 138 if (res->ai_canonname 139 && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 140 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 141 *ahost = canonnamebuf; 142 } 143 nres = 0; 144 for (ai = res; ai; ai = ai->ai_next) 145 nres++; 146 ai = res; 147 refused = 0; 148 sigemptyset(&newmask); 149 sigaddset(&newmask, SIGURG); 150 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 151 for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 152 s = rresvport_af(&lport, ai->ai_family); 153 if (s < 0) { 154 if (errno != EAGAIN && ai->ai_next) { 155 ai = ai->ai_next; 156 continue; 157 } 158 if (errno == EAGAIN) 159 fprintf(stderr, 160 "rcmd: socket: All ports in use\n"); 161 else 162 fprintf(stderr, "rcmd: socket: %s\n", 163 strerror(errno)); 164 freeaddrinfo(res); 165 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 166 NULL); 167 return (-1); 168 } 169 _fcntl(s, F_SETOWN, pid); 170 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 171 break; 172 _close(s); 173 if (errno == EADDRINUSE) { 174 lport--; 175 continue; 176 } 177 if (errno == ECONNREFUSED) 178 refused = 1; 179 if (ai->ai_next == NULL && (!refused || timo > 16)) { 180 fprintf(stderr, "%s: %s\n", *ahost, strerror(errno)); 181 freeaddrinfo(res); 182 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 183 NULL); 184 return (-1); 185 } 186 if (nres > 1) { 187 int oerrno = errno; 188 189 getnameinfo(ai->ai_addr, ai->ai_addrlen, 190 paddr, sizeof(paddr), 191 NULL, 0, 192 NI_NUMERICHOST|NI_WITHSCOPEID); 193 fprintf(stderr, "connect to address %s: ", paddr); 194 errno = oerrno; 195 perror(0); 196 } 197 if ((ai = ai->ai_next) == NULL) { 198 /* refused && timo <= 16 */ 199 struct timespec time_to_sleep, time_remaining; 200 201 time_to_sleep.tv_sec = timo; 202 time_to_sleep.tv_nsec = 0; 203 _nanosleep(&time_to_sleep, &time_remaining); 204 timo *= 2; 205 ai = res; 206 refused = 0; 207 } 208 if (nres > 1) { 209 getnameinfo(ai->ai_addr, ai->ai_addrlen, 210 paddr, sizeof(paddr), 211 NULL, 0, 212 NI_NUMERICHOST|NI_WITHSCOPEID); 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 char num[8]; 222 int s2 = rresvport_af(&lport, ai->ai_family), s3; 223 int len = ai->ai_addrlen; 224 int nfds; 225 226 if (s2 < 0) 227 goto bad; 228 _listen(s2, 1); 229 snprintf(num, sizeof(num), "%d", lport); 230 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 231 fprintf(stderr, 232 "rcmd: write (setting up stderr): %s\n", 233 strerror(errno)); 234 _close(s2); 235 goto bad; 236 } 237 nfds = max(s, s2)+1; 238 if(nfds > FD_SETSIZE) { 239 fprintf(stderr, "rcmd: too many files\n"); 240 _close(s2); 241 goto bad; 242 } 243 again: 244 FD_ZERO(&reads); 245 FD_SET(s, &reads); 246 FD_SET(s2, &reads); 247 errno = 0; 248 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 249 if (errno != 0) 250 fprintf(stderr, 251 "rcmd: select (setting up stderr): %s\n", 252 strerror(errno)); 253 else 254 fprintf(stderr, 255 "select: protocol failure in circuit setup\n"); 256 _close(s2); 257 goto bad; 258 } 259 s3 = _accept(s2, (struct sockaddr *)&from, &len); 260 switch (from.ss_family) { 261 case AF_INET: 262 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 263 break; 264 #ifdef INET6 265 case AF_INET6: 266 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 267 break; 268 #endif 269 default: 270 aport = 0; /* error */ 271 break; 272 } 273 /* 274 * XXX careful for ftp bounce attacks. If discovered, shut them 275 * down and check for the real auxiliary channel to connect. 276 */ 277 if (aport == 20) { 278 _close(s3); 279 goto again; 280 } 281 _close(s2); 282 if (s3 < 0) { 283 fprintf(stderr, 284 "rcmd: accept: %s\n", strerror(errno)); 285 lport = 0; 286 goto bad; 287 } 288 *fd2p = s3; 289 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 290 fprintf(stderr, 291 "socket: protocol failure in circuit setup.\n"); 292 goto bad2; 293 } 294 } 295 _write(s, locuser, strlen(locuser)+1); 296 _write(s, remuser, strlen(remuser)+1); 297 _write(s, cmd, strlen(cmd)+1); 298 if (_read(s, &c, 1) != 1) { 299 fprintf(stderr, 300 "rcmd: %s: %s\n", *ahost, strerror(errno)); 301 goto bad2; 302 } 303 if (c != 0) { 304 while (_read(s, &c, 1) == 1) { 305 _write(STDERR_FILENO, &c, 1); 306 if (c == '\n') 307 break; 308 } 309 goto bad2; 310 } 311 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 312 freeaddrinfo(res); 313 return (s); 314 bad2: 315 if (lport) 316 _close(*fd2p); 317 bad: 318 _close(s); 319 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 320 freeaddrinfo(res); 321 return (-1); 322 } 323 324 int 325 rresvport(int *port) 326 { 327 return rresvport_af(port, AF_INET); 328 } 329 330 int 331 rresvport_af(int *alport, int family) 332 { 333 int s; 334 struct sockaddr_storage ss; 335 u_short *sport; 336 337 memset(&ss, 0, sizeof(ss)); 338 ss.ss_family = family; 339 switch (family) { 340 case AF_INET: 341 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 342 sport = &((struct sockaddr_in *)&ss)->sin_port; 343 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 344 break; 345 #ifdef INET6 346 case AF_INET6: 347 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 348 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 349 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 350 break; 351 #endif 352 default: 353 errno = EAFNOSUPPORT; 354 return -1; 355 } 356 357 s = _socket(ss.ss_family, SOCK_STREAM, 0); 358 if (s < 0) 359 return (-1); 360 #if 0 /* compat_exact_traditional_rresvport_semantics */ 361 sin.sin_port = htons((u_short)*alport); 362 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 363 return (s); 364 if (errno != EADDRINUSE) { 365 _close(s); 366 return (-1); 367 } 368 #endif 369 *sport = 0; 370 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 371 _close(s); 372 return (-1); 373 } 374 *alport = (int)ntohs(*sport); 375 return (s); 376 } 377 378 int __check_rhosts_file = 1; 379 char *__rcmd_errstr; 380 381 int 382 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser) 383 { 384 struct addrinfo hints, *res, *r; 385 int error; 386 387 memset(&hints, 0, sizeof(hints)); 388 hints.ai_family = PF_UNSPEC; 389 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 390 error = getaddrinfo(rhost, "0", &hints, &res); 391 if (error) 392 return (-1); 393 394 for (r = res; r; r = r->ai_next) { 395 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 396 luser) == 0) { 397 freeaddrinfo(res); 398 return (0); 399 } 400 } 401 freeaddrinfo(res); 402 return (-1); 403 } 404 405 /* 406 * New .rhosts strategy: We are passed an ip address. We spin through 407 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 408 * has ip addresses, we don't have to trust a nameserver. When it 409 * contains hostnames, we spin through the list of addresses the nameserver 410 * gives us and look for a match. 411 * 412 * Returns 0 if ok, -1 if not ok. 413 */ 414 int 415 iruserok(unsigned long raddr, int superuser, const char *ruser, 416 const char *luser) 417 { 418 struct sockaddr_in sin; 419 420 memset(&sin, 0, sizeof(sin)); 421 sin.sin_family = AF_INET; 422 sin.sin_len = sizeof(struct sockaddr_in); 423 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 424 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 425 ruser, luser); 426 } 427 428 /* 429 * AF independent extension of iruserok. 430 * 431 * Returns 0 if ok, -1 if not ok. 432 */ 433 int 434 iruserok_sa(const void *ra, int rlen, int superuser, const char *ruser, 435 const char *luser) 436 { 437 char *cp; 438 struct stat sbuf; 439 struct passwd *pwd; 440 FILE *hostf; 441 uid_t uid; 442 int first; 443 char pbuf[MAXPATHLEN]; 444 const struct sockaddr *raddr; 445 struct sockaddr_storage ss; 446 447 /* avoid alignment issue */ 448 if (rlen > sizeof(ss)) 449 return(-1); 450 memcpy(&ss, ra, rlen); 451 raddr = (struct sockaddr *)&ss; 452 453 first = 1; 454 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 455 again: 456 if (hostf) { 457 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 458 fclose(hostf); 459 return (0); 460 } 461 fclose(hostf); 462 } 463 if (first == 1 && (__check_rhosts_file || superuser)) { 464 first = 0; 465 if ((pwd = getpwnam(luser)) == NULL) 466 return (-1); 467 strcpy(pbuf, pwd->pw_dir); 468 strcat(pbuf, "/.rhosts"); 469 470 /* 471 * Change effective uid while opening .rhosts. If root and 472 * reading an NFS mounted file system, can't read files that 473 * are protected read/write owner only. 474 */ 475 uid = geteuid(); 476 seteuid(pwd->pw_uid); 477 hostf = fopen(pbuf, "r"); 478 seteuid(uid); 479 480 if (hostf == NULL) 481 return (-1); 482 /* 483 * If not a regular file, or is owned by someone other than 484 * user or root or if writeable by anyone but the owner, quit. 485 */ 486 cp = NULL; 487 if (lstat(pbuf, &sbuf) < 0) 488 cp = ".rhosts lstat failed"; 489 else if (!S_ISREG(sbuf.st_mode)) 490 cp = ".rhosts not regular file"; 491 else if (_fstat(fileno(hostf), &sbuf) < 0) 492 cp = ".rhosts fstat failed"; 493 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 494 cp = "bad .rhosts owner"; 495 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 496 cp = ".rhosts writeable by other than owner"; 497 /* If there were any problems, quit. */ 498 if (cp) { 499 __rcmd_errstr = cp; 500 fclose(hostf); 501 return (-1); 502 } 503 goto again; 504 } 505 return (-1); 506 } 507 508 /* 509 * XXX 510 * Don't make static, used by lpd(8). 511 * 512 * Returns 0 if ok, -1 if not ok. 513 */ 514 int 515 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser) 516 { 517 struct sockaddr_in sin; 518 519 memset(&sin, 0, sizeof(sin)); 520 sin.sin_family = AF_INET; 521 sin.sin_len = sizeof(struct sockaddr_in); 522 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 523 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 524 luser, ruser); 525 } 526 527 /* 528 * Returns 0 if ok, -1 if not ok. 529 * 530 * XXX obsolete API. 531 */ 532 int 533 __ivaliduser_af(FILE *hostf, const void *raddr, const char *luser, 534 const char *ruser, int af, int len) 535 { 536 struct sockaddr *sa = NULL; 537 struct sockaddr_in *sin = NULL; 538 #ifdef INET6 539 struct sockaddr_in6 *sin6 = NULL; 540 #endif 541 struct sockaddr_storage ss; 542 543 memset(&ss, 0, sizeof(ss)); 544 switch (af) { 545 case AF_INET: 546 if (len != sizeof(sin->sin_addr)) 547 return -1; 548 sin = (struct sockaddr_in *)&ss; 549 sin->sin_family = AF_INET; 550 sin->sin_len = sizeof(struct sockaddr_in); 551 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 552 break; 553 #ifdef INET6 554 case AF_INET6: 555 if (len != sizeof(sin6->sin6_addr)) 556 return -1; 557 /* you will lose scope info */ 558 sin6 = (struct sockaddr_in6 *)&ss; 559 sin6->sin6_family = AF_INET6; 560 sin6->sin6_len = sizeof(struct sockaddr_in6); 561 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 562 break; 563 #endif 564 default: 565 return -1; 566 } 567 568 sa = (struct sockaddr *)&ss; 569 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 570 } 571 572 /* 573 * Returns 0 if ok, -1 if not ok. 574 */ 575 int 576 __ivaliduser_sa(FILE *hostf, const struct sockaddr *raddr, socklen_t salen, 577 const char *luser, const char *ruser) 578 { 579 char *user, *p; 580 int ch; 581 char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 582 char hname[MAXHOSTNAMELEN]; 583 /* Presumed guilty until proven innocent. */ 584 int userok = 0, hostok = 0; 585 #ifdef YP 586 char *ypdomain; 587 588 if (yp_get_default_domain(&ypdomain)) 589 ypdomain = NULL; 590 #else 591 #define ypdomain NULL 592 #endif 593 /* We need to get the damn hostname back for netgroup matching. */ 594 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 595 NI_NAMEREQD) != 0) 596 hname[0] = '\0'; 597 598 while (fgets(buf, sizeof(buf), hostf)) { 599 p = buf; 600 /* Skip lines that are too long. */ 601 if (strchr(p, '\n') == NULL) { 602 while ((ch = getc(hostf)) != '\n' && ch != EOF); 603 continue; 604 } 605 if (*p == '\n' || *p == '#') { 606 /* comment... */ 607 continue; 608 } 609 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 610 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 611 p++; 612 } 613 if (*p == ' ' || *p == '\t') { 614 *p++ = '\0'; 615 while (*p == ' ' || *p == '\t') 616 p++; 617 user = p; 618 while (*p != '\n' && *p != ' ' && 619 *p != '\t' && *p != '\0') 620 p++; 621 } else 622 user = p; 623 *p = '\0'; 624 /* 625 * Do +/- and +@/-@ checking. This looks really nasty, 626 * but it matches SunOS's behavior so far as I can tell. 627 */ 628 switch(buf[0]) { 629 case '+': 630 if (!buf[1]) { /* '+' matches all hosts */ 631 hostok = 1; 632 break; 633 } 634 if (buf[1] == '@') /* match a host by netgroup */ 635 hostok = hname[0] != '\0' && 636 innetgr(&buf[2], hname, NULL, ypdomain); 637 else /* match a host by addr */ 638 hostok = __icheckhost(raddr, salen, 639 (char *)&buf[1]); 640 break; 641 case '-': /* reject '-' hosts and all their users */ 642 if (buf[1] == '@') { 643 if (hname[0] == '\0' || 644 innetgr(&buf[2], hname, NULL, ypdomain)) 645 return(-1); 646 } else { 647 if (__icheckhost(raddr, salen, 648 (char *)&buf[1])) 649 return(-1); 650 } 651 break; 652 default: /* if no '+' or '-', do a simple match */ 653 hostok = __icheckhost(raddr, salen, buf); 654 break; 655 } 656 switch(*user) { 657 case '+': 658 if (!*(user+1)) { /* '+' matches all users */ 659 userok = 1; 660 break; 661 } 662 if (*(user+1) == '@') /* match a user by netgroup */ 663 userok = innetgr(user+2, NULL, ruser, ypdomain); 664 else /* match a user by direct specification */ 665 userok = !(strcmp(ruser, user+1)); 666 break; 667 case '-': /* if we matched a hostname, */ 668 if (hostok) { /* check for user field rejections */ 669 if (!*(user+1)) 670 return(-1); 671 if (*(user+1) == '@') { 672 if (innetgr(user+2, NULL, 673 ruser, ypdomain)) 674 return(-1); 675 } else { 676 if (!strcmp(ruser, user+1)) 677 return(-1); 678 } 679 } 680 break; 681 default: /* no rejections: try to match the user */ 682 if (hostok) 683 userok = !(strcmp(ruser,*user ? user : luser)); 684 break; 685 } 686 if (hostok && userok) 687 return(0); 688 } 689 return (-1); 690 } 691 692 /* 693 * Returns "true" if match, 0 if no match. 694 * 695 * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion 696 * if af == AF_INET6. 697 */ 698 static int 699 __icheckhost(const struct sockaddr *raddr, socklen_t salen, const char *lhost) 700 { 701 struct sockaddr_in sin; 702 struct sockaddr_in6 *sin6; 703 struct addrinfo hints, *res, *r; 704 int error; 705 char h1[NI_MAXHOST], h2[NI_MAXHOST]; 706 707 if (raddr->sa_family == AF_INET6) { 708 sin6 = (struct sockaddr_in6 *)raddr; 709 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 710 memset(&sin, 0, sizeof(sin)); 711 sin.sin_family = AF_INET; 712 sin.sin_len = sizeof(struct sockaddr_in); 713 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 714 sizeof(sin.sin_addr)); 715 raddr = (struct sockaddr *)&sin; 716 salen = sin.sin_len; 717 } 718 } 719 720 h1[0] = '\0'; 721 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 722 NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 723 return (0); 724 725 /* Resolve laddr into sockaddr */ 726 memset(&hints, 0, sizeof(hints)); 727 hints.ai_family = raddr->sa_family; 728 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 729 res = NULL; 730 error = getaddrinfo(lhost, "0", &hints, &res); 731 if (error) 732 return (0); 733 734 for (r = res; r ; r = r->ai_next) { 735 h2[0] = '\0'; 736 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 737 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 738 continue; 739 if (strcmp(h1, h2) == 0) { 740 freeaddrinfo(res); 741 return (1); 742 } 743 } 744 745 /* No match. */ 746 freeaddrinfo(res); 747 return (0); 748 } 749