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 1.5 2005/01/31 22:29:33 dillon Exp $ 35 * 36 * @(#)rcmd.c 8.3 (Berkeley) 3/26/94 37 */ 38 39 #include "namespace.h" 40 #include <sys/param.h> 41 #include <sys/socket.h> 42 #include <sys/stat.h> 43 44 #include <netinet/in.h> 45 #include <arpa/inet.h> 46 47 #include <signal.h> 48 #include <fcntl.h> 49 #include <netdb.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <pwd.h> 53 #include <errno.h> 54 #include <stdio.h> 55 #include <ctype.h> 56 #include <string.h> 57 #ifdef YP 58 #include <rpc/rpc.h> 59 #include <rpcsvc/yp_prot.h> 60 #include <rpcsvc/ypclnt.h> 61 #endif 62 #include <arpa/nameser.h> 63 #include "un-namespace.h" 64 65 /* wrapper for KAME-special getnameinfo() */ 66 #ifndef NI_WITHSCOPEID 67 #define NI_WITHSCOPEID 0 68 #endif 69 70 extern int innetgr ( const char *, const char *, const char *, const char * ); 71 72 #define max(a, b) ((a > b) ? a : b) 73 74 int __ivaliduser (FILE *, u_int32_t, const char *, const char *); 75 int __ivaliduser_af (FILE *,const void *, const char *, const char *, 76 int, int); 77 int __ivaliduser_sa (FILE *, const struct sockaddr *, socklen_t, 78 const char *,const char *); 79 static int __icheckhost (const struct sockaddr *, socklen_t, 80 const char *); 81 82 char paddr[NI_MAXHOST]; 83 84 int 85 rcmd(ahost, rport, locuser, remuser, cmd, fd2p) 86 char **ahost; 87 u_short rport; 88 const char *locuser, *remuser, *cmd; 89 int *fd2p; 90 { 91 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 92 } 93 94 int 95 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) 96 char **ahost; 97 u_short rport; 98 const char *locuser, *remuser, *cmd; 99 int *fd2p; 100 int af; 101 { 102 struct addrinfo hints, *res, *ai; 103 struct sockaddr_storage from; 104 fd_set reads; 105 sigset_t oldmask, newmask; 106 pid_t pid; 107 int s, aport, lport, timo, error; 108 char c, *p; 109 int refused, nres; 110 char num[8]; 111 static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 112 113 /* call rcmdsh() with specified remote shell if appropriate. */ 114 if (!issetugid() && (p = getenv("RSH"))) { 115 struct servent *sp = getservbyname("shell", "tcp"); 116 117 if (sp && sp->s_port == rport) 118 return (rcmdsh(ahost, rport, locuser, remuser, 119 cmd, p)); 120 } 121 122 /* use rsh(1) if non-root and remote port is shell. */ 123 if (geteuid()) { 124 struct servent *sp = getservbyname("shell", "tcp"); 125 126 if (sp && sp->s_port == rport) 127 return (rcmdsh(ahost, rport, locuser, remuser, 128 cmd, NULL)); 129 } 130 131 pid = getpid(); 132 133 memset(&hints, 0, sizeof(hints)); 134 hints.ai_flags = AI_CANONNAME; 135 hints.ai_family = af; 136 hints.ai_socktype = SOCK_STREAM; 137 hints.ai_protocol = 0; 138 (void)snprintf(num, sizeof(num), "%d", ntohs(rport)); 139 error = getaddrinfo(*ahost, num, &hints, &res); 140 if (error) { 141 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 142 gai_strerror(error)); 143 if (error == EAI_SYSTEM) 144 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 145 strerror(errno)); 146 return (-1); 147 } 148 149 if (res->ai_canonname 150 && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 151 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 152 *ahost = canonnamebuf; 153 } 154 nres = 0; 155 for (ai = res; ai; ai = ai->ai_next) 156 nres++; 157 ai = res; 158 refused = 0; 159 sigemptyset(&newmask); 160 sigaddset(&newmask, SIGURG); 161 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 162 for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 163 s = rresvport_af(&lport, ai->ai_family); 164 if (s < 0) { 165 if (errno != EAGAIN && ai->ai_next) { 166 ai = ai->ai_next; 167 continue; 168 } 169 if (errno == EAGAIN) 170 (void)fprintf(stderr, 171 "rcmd: socket: All ports in use\n"); 172 else 173 (void)fprintf(stderr, "rcmd: socket: %s\n", 174 strerror(errno)); 175 freeaddrinfo(res); 176 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 177 NULL); 178 return (-1); 179 } 180 _fcntl(s, F_SETOWN, pid); 181 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 182 break; 183 (void)_close(s); 184 if (errno == EADDRINUSE) { 185 lport--; 186 continue; 187 } 188 if (errno == ECONNREFUSED) 189 refused = 1; 190 if (ai->ai_next == NULL && (!refused || timo > 16)) { 191 (void)fprintf(stderr, "%s: %s\n", 192 *ahost, strerror(errno)); 193 freeaddrinfo(res); 194 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 195 NULL); 196 return (-1); 197 } 198 if (nres > 1) { 199 int oerrno = errno; 200 201 getnameinfo(ai->ai_addr, ai->ai_addrlen, 202 paddr, sizeof(paddr), 203 NULL, 0, 204 NI_NUMERICHOST|NI_WITHSCOPEID); 205 (void)fprintf(stderr, "connect to address %s: ", 206 paddr); 207 errno = oerrno; 208 perror(0); 209 } 210 if ((ai = ai->ai_next) == NULL) { 211 /* refused && timo <= 16 */ 212 struct timespec time_to_sleep, time_remaining; 213 214 time_to_sleep.tv_sec = timo; 215 time_to_sleep.tv_nsec = 0; 216 (void)_nanosleep(&time_to_sleep, &time_remaining); 217 timo *= 2; 218 ai = res; 219 refused = 0; 220 } 221 if (nres > 1) { 222 getnameinfo(ai->ai_addr, ai->ai_addrlen, 223 paddr, sizeof(paddr), 224 NULL, 0, 225 NI_NUMERICHOST|NI_WITHSCOPEID); 226 fprintf(stderr, "Trying %s...\n", paddr); 227 } 228 } 229 lport--; 230 if (fd2p == 0) { 231 _write(s, "", 1); 232 lport = 0; 233 } else { 234 char num[8]; 235 int s2 = rresvport_af(&lport, ai->ai_family), s3; 236 int len = ai->ai_addrlen; 237 int nfds; 238 239 if (s2 < 0) 240 goto bad; 241 _listen(s2, 1); 242 (void)snprintf(num, sizeof(num), "%d", lport); 243 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 244 (void)fprintf(stderr, 245 "rcmd: write (setting up stderr): %s\n", 246 strerror(errno)); 247 (void)_close(s2); 248 goto bad; 249 } 250 nfds = max(s, s2)+1; 251 if(nfds > FD_SETSIZE) { 252 fprintf(stderr, "rcmd: too many files\n"); 253 (void)_close(s2); 254 goto bad; 255 } 256 again: 257 FD_ZERO(&reads); 258 FD_SET(s, &reads); 259 FD_SET(s2, &reads); 260 errno = 0; 261 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 262 if (errno != 0) 263 (void)fprintf(stderr, 264 "rcmd: select (setting up stderr): %s\n", 265 strerror(errno)); 266 else 267 (void)fprintf(stderr, 268 "select: protocol failure in circuit setup\n"); 269 (void)_close(s2); 270 goto bad; 271 } 272 s3 = _accept(s2, (struct sockaddr *)&from, &len); 273 switch (from.ss_family) { 274 case AF_INET: 275 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 276 break; 277 #ifdef INET6 278 case AF_INET6: 279 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 280 break; 281 #endif 282 default: 283 aport = 0; /* error */ 284 break; 285 } 286 /* 287 * XXX careful for ftp bounce attacks. If discovered, shut them 288 * down and check for the real auxiliary channel to connect. 289 */ 290 if (aport == 20) { 291 _close(s3); 292 goto again; 293 } 294 (void)_close(s2); 295 if (s3 < 0) { 296 (void)fprintf(stderr, 297 "rcmd: accept: %s\n", strerror(errno)); 298 lport = 0; 299 goto bad; 300 } 301 *fd2p = s3; 302 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 303 (void)fprintf(stderr, 304 "socket: protocol failure in circuit setup.\n"); 305 goto bad2; 306 } 307 } 308 (void)_write(s, locuser, strlen(locuser)+1); 309 (void)_write(s, remuser, strlen(remuser)+1); 310 (void)_write(s, cmd, strlen(cmd)+1); 311 if (_read(s, &c, 1) != 1) { 312 (void)fprintf(stderr, 313 "rcmd: %s: %s\n", *ahost, strerror(errno)); 314 goto bad2; 315 } 316 if (c != 0) { 317 while (_read(s, &c, 1) == 1) { 318 (void)_write(STDERR_FILENO, &c, 1); 319 if (c == '\n') 320 break; 321 } 322 goto bad2; 323 } 324 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 325 freeaddrinfo(res); 326 return (s); 327 bad2: 328 if (lport) 329 (void)_close(*fd2p); 330 bad: 331 (void)_close(s); 332 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 333 freeaddrinfo(res); 334 return (-1); 335 } 336 337 int 338 rresvport(port) 339 int *port; 340 { 341 return rresvport_af(port, AF_INET); 342 } 343 344 int 345 rresvport_af(alport, family) 346 int *alport, family; 347 { 348 int i, s, len, err; 349 struct sockaddr_storage ss; 350 u_short *sport; 351 352 memset(&ss, 0, sizeof(ss)); 353 ss.ss_family = family; 354 switch (family) { 355 case AF_INET: 356 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 357 sport = &((struct sockaddr_in *)&ss)->sin_port; 358 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 359 break; 360 #ifdef INET6 361 case AF_INET6: 362 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 363 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 364 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 365 break; 366 #endif 367 default: 368 errno = EAFNOSUPPORT; 369 return -1; 370 } 371 372 s = _socket(ss.ss_family, SOCK_STREAM, 0); 373 if (s < 0) 374 return (-1); 375 #if 0 /* compat_exact_traditional_rresvport_semantics */ 376 sin.sin_port = htons((u_short)*alport); 377 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 378 return (s); 379 if (errno != EADDRINUSE) { 380 (void)_close(s); 381 return (-1); 382 } 383 #endif 384 *sport = 0; 385 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 386 (void)_close(s); 387 return (-1); 388 } 389 *alport = (int)ntohs(*sport); 390 return (s); 391 } 392 393 int __check_rhosts_file = 1; 394 char *__rcmd_errstr; 395 396 int 397 ruserok(rhost, superuser, ruser, luser) 398 const char *rhost, *ruser, *luser; 399 int superuser; 400 { 401 struct addrinfo hints, *res, *r; 402 int error; 403 404 memset(&hints, 0, sizeof(hints)); 405 hints.ai_family = PF_UNSPEC; 406 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 407 error = getaddrinfo(rhost, "0", &hints, &res); 408 if (error) 409 return (-1); 410 411 for (r = res; r; r = r->ai_next) { 412 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 413 luser) == 0) { 414 freeaddrinfo(res); 415 return (0); 416 } 417 } 418 freeaddrinfo(res); 419 return (-1); 420 } 421 422 /* 423 * New .rhosts strategy: We are passed an ip address. We spin through 424 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 425 * has ip addresses, we don't have to trust a nameserver. When it 426 * contains hostnames, we spin through the list of addresses the nameserver 427 * gives us and look for a match. 428 * 429 * Returns 0 if ok, -1 if not ok. 430 */ 431 int 432 iruserok(raddr, superuser, ruser, luser) 433 unsigned long raddr; 434 int superuser; 435 const char *ruser, *luser; 436 { 437 struct sockaddr_in sin; 438 439 memset(&sin, 0, sizeof(sin)); 440 sin.sin_family = AF_INET; 441 sin.sin_len = sizeof(struct sockaddr_in); 442 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 443 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 444 ruser, luser); 445 } 446 447 /* 448 * AF independent extension of iruserok. 449 * 450 * Returns 0 if ok, -1 if not ok. 451 */ 452 int 453 iruserok_sa(ra, rlen, superuser, ruser, luser) 454 const void *ra; 455 int rlen; 456 int superuser; 457 const char *ruser, *luser; 458 { 459 char *cp; 460 struct stat sbuf; 461 struct passwd *pwd; 462 FILE *hostf; 463 uid_t uid; 464 int first; 465 char pbuf[MAXPATHLEN]; 466 const struct sockaddr *raddr; 467 struct sockaddr_storage ss; 468 469 /* avoid alignment issue */ 470 if (rlen > sizeof(ss)) 471 return(-1); 472 memcpy(&ss, ra, rlen); 473 raddr = (struct sockaddr *)&ss; 474 475 first = 1; 476 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 477 again: 478 if (hostf) { 479 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 480 (void)fclose(hostf); 481 return (0); 482 } 483 (void)fclose(hostf); 484 } 485 if (first == 1 && (__check_rhosts_file || superuser)) { 486 first = 0; 487 if ((pwd = getpwnam(luser)) == NULL) 488 return (-1); 489 (void)strcpy(pbuf, pwd->pw_dir); 490 (void)strcat(pbuf, "/.rhosts"); 491 492 /* 493 * Change effective uid while opening .rhosts. If root and 494 * reading an NFS mounted file system, can't read files that 495 * are protected read/write owner only. 496 */ 497 uid = geteuid(); 498 (void)seteuid(pwd->pw_uid); 499 hostf = fopen(pbuf, "r"); 500 (void)seteuid(uid); 501 502 if (hostf == NULL) 503 return (-1); 504 /* 505 * If not a regular file, or is owned by someone other than 506 * user or root or if writeable by anyone but the owner, quit. 507 */ 508 cp = NULL; 509 if (lstat(pbuf, &sbuf) < 0) 510 cp = ".rhosts lstat failed"; 511 else if (!S_ISREG(sbuf.st_mode)) 512 cp = ".rhosts not regular file"; 513 else if (_fstat(fileno(hostf), &sbuf) < 0) 514 cp = ".rhosts fstat failed"; 515 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 516 cp = "bad .rhosts owner"; 517 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 518 cp = ".rhosts writeable by other than owner"; 519 /* If there were any problems, quit. */ 520 if (cp) { 521 __rcmd_errstr = cp; 522 (void)fclose(hostf); 523 return (-1); 524 } 525 goto again; 526 } 527 return (-1); 528 } 529 530 /* 531 * XXX 532 * Don't make static, used by lpd(8). 533 * 534 * Returns 0 if ok, -1 if not ok. 535 */ 536 int 537 __ivaliduser(hostf, raddr, luser, ruser) 538 FILE *hostf; 539 u_int32_t raddr; 540 const char *luser, *ruser; 541 { 542 struct sockaddr_in sin; 543 544 memset(&sin, 0, sizeof(sin)); 545 sin.sin_family = AF_INET; 546 sin.sin_len = sizeof(struct sockaddr_in); 547 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 548 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 549 luser, ruser); 550 } 551 552 /* 553 * Returns 0 if ok, -1 if not ok. 554 * 555 * XXX obsolete API. 556 */ 557 int 558 __ivaliduser_af(hostf, raddr, luser, ruser, af, len) 559 FILE *hostf; 560 const void *raddr; 561 const char *luser, *ruser; 562 int af, len; 563 { 564 struct sockaddr *sa = NULL; 565 struct sockaddr_in *sin = NULL; 566 #ifdef INET6 567 struct sockaddr_in6 *sin6 = NULL; 568 #endif 569 struct sockaddr_storage ss; 570 571 memset(&ss, 0, sizeof(ss)); 572 switch (af) { 573 case AF_INET: 574 if (len != sizeof(sin->sin_addr)) 575 return -1; 576 sin = (struct sockaddr_in *)&ss; 577 sin->sin_family = AF_INET; 578 sin->sin_len = sizeof(struct sockaddr_in); 579 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 580 break; 581 #ifdef INET6 582 case AF_INET6: 583 if (len != sizeof(sin6->sin6_addr)) 584 return -1; 585 /* you will lose scope info */ 586 sin6 = (struct sockaddr_in6 *)&ss; 587 sin6->sin6_family = AF_INET6; 588 sin6->sin6_len = sizeof(struct sockaddr_in6); 589 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 590 break; 591 #endif 592 default: 593 return -1; 594 } 595 596 sa = (struct sockaddr *)&ss; 597 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 598 } 599 600 /* 601 * Returns 0 if ok, -1 if not ok. 602 */ 603 int 604 __ivaliduser_sa(hostf, raddr, salen, luser, ruser) 605 FILE *hostf; 606 const struct sockaddr *raddr; 607 socklen_t salen; 608 const char *luser, *ruser; 609 { 610 char *user, *p; 611 int ch; 612 char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 613 char hname[MAXHOSTNAMELEN]; 614 /* Presumed guilty until proven innocent. */ 615 int userok = 0, hostok = 0; 616 int h_error; 617 #ifdef YP 618 char *ypdomain; 619 620 if (yp_get_default_domain(&ypdomain)) 621 ypdomain = NULL; 622 #else 623 #define ypdomain NULL 624 #endif 625 /* We need to get the damn hostname back for netgroup matching. */ 626 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 627 NI_NAMEREQD) != 0) 628 hname[0] = '\0'; 629 630 while (fgets(buf, sizeof(buf), hostf)) { 631 p = buf; 632 /* Skip lines that are too long. */ 633 if (strchr(p, '\n') == NULL) { 634 while ((ch = getc(hostf)) != '\n' && ch != EOF); 635 continue; 636 } 637 if (*p == '\n' || *p == '#') { 638 /* comment... */ 639 continue; 640 } 641 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 642 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 643 p++; 644 } 645 if (*p == ' ' || *p == '\t') { 646 *p++ = '\0'; 647 while (*p == ' ' || *p == '\t') 648 p++; 649 user = p; 650 while (*p != '\n' && *p != ' ' && 651 *p != '\t' && *p != '\0') 652 p++; 653 } else 654 user = p; 655 *p = '\0'; 656 /* 657 * Do +/- and +@/-@ checking. This looks really nasty, 658 * but it matches SunOS's behavior so far as I can tell. 659 */ 660 switch(buf[0]) { 661 case '+': 662 if (!buf[1]) { /* '+' matches all hosts */ 663 hostok = 1; 664 break; 665 } 666 if (buf[1] == '@') /* match a host by netgroup */ 667 hostok = hname[0] != '\0' && 668 innetgr(&buf[2], hname, NULL, ypdomain); 669 else /* match a host by addr */ 670 hostok = __icheckhost(raddr, salen, 671 (char *)&buf[1]); 672 break; 673 case '-': /* reject '-' hosts and all their users */ 674 if (buf[1] == '@') { 675 if (hname[0] == '\0' || 676 innetgr(&buf[2], hname, NULL, ypdomain)) 677 return(-1); 678 } else { 679 if (__icheckhost(raddr, salen, 680 (char *)&buf[1])) 681 return(-1); 682 } 683 break; 684 default: /* if no '+' or '-', do a simple match */ 685 hostok = __icheckhost(raddr, salen, buf); 686 break; 687 } 688 switch(*user) { 689 case '+': 690 if (!*(user+1)) { /* '+' matches all users */ 691 userok = 1; 692 break; 693 } 694 if (*(user+1) == '@') /* match a user by netgroup */ 695 userok = innetgr(user+2, NULL, ruser, ypdomain); 696 else /* match a user by direct specification */ 697 userok = !(strcmp(ruser, user+1)); 698 break; 699 case '-': /* if we matched a hostname, */ 700 if (hostok) { /* check for user field rejections */ 701 if (!*(user+1)) 702 return(-1); 703 if (*(user+1) == '@') { 704 if (innetgr(user+2, NULL, 705 ruser, ypdomain)) 706 return(-1); 707 } else { 708 if (!strcmp(ruser, user+1)) 709 return(-1); 710 } 711 } 712 break; 713 default: /* no rejections: try to match the user */ 714 if (hostok) 715 userok = !(strcmp(ruser,*user ? user : luser)); 716 break; 717 } 718 if (hostok && userok) 719 return(0); 720 } 721 return (-1); 722 } 723 724 /* 725 * Returns "true" if match, 0 if no match. 726 * 727 * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion 728 * if af == AF_INET6. 729 */ 730 static int 731 __icheckhost(raddr, salen, lhost) 732 const struct sockaddr *raddr; 733 socklen_t salen; 734 const char *lhost; 735 { 736 struct sockaddr_in sin; 737 struct sockaddr_in6 *sin6; 738 struct addrinfo hints, *res, *r; 739 int error; 740 char h1[NI_MAXHOST], h2[NI_MAXHOST]; 741 742 if (raddr->sa_family == AF_INET6) { 743 sin6 = (struct sockaddr_in6 *)raddr; 744 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 745 memset(&sin, 0, sizeof(sin)); 746 sin.sin_family = AF_INET; 747 sin.sin_len = sizeof(struct sockaddr_in); 748 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 749 sizeof(sin.sin_addr)); 750 raddr = (struct sockaddr *)&sin; 751 salen = sin.sin_len; 752 } 753 } 754 755 h1[0] = '\0'; 756 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 757 NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 758 return (0); 759 760 /* Resolve laddr into sockaddr */ 761 memset(&hints, 0, sizeof(hints)); 762 hints.ai_family = raddr->sa_family; 763 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 764 res = NULL; 765 error = getaddrinfo(lhost, "0", &hints, &res); 766 if (error) 767 return (0); 768 769 for (r = res; r ; r = r->ai_next) { 770 h2[0] = '\0'; 771 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 772 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 773 continue; 774 if (strcmp(h1, h2) == 0) { 775 freeaddrinfo(res); 776 return (1); 777 } 778 } 779 780 /* No match. */ 781 freeaddrinfo(res); 782 return (0); 783 } 784