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 * $FreeBSD$ 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94"; 38 #endif /* LIBC_SCCS and not lint */ 39 40 #include "namespace.h" 41 #include <sys/param.h> 42 #include <sys/socket.h> 43 #include <sys/stat.h> 44 45 #include <netinet/in.h> 46 #include <arpa/inet.h> 47 48 #include <signal.h> 49 #include <fcntl.h> 50 #include <netdb.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 #include <pwd.h> 54 #include <errno.h> 55 #include <stdio.h> 56 #include <ctype.h> 57 #include <string.h> 58 #ifdef YP 59 #include <rpc/rpc.h> 60 #include <rpcsvc/yp_prot.h> 61 #include <rpcsvc/ypclnt.h> 62 #endif 63 #include <arpa/nameser.h> 64 #include "un-namespace.h" 65 66 /* wrapper for KAME-special getnameinfo() */ 67 #ifndef NI_WITHSCOPEID 68 #define NI_WITHSCOPEID 0 69 #endif 70 71 extern int innetgr __P(( const char *, const char *, const char *, const char * )); 72 73 #define max(a, b) ((a > b) ? a : b) 74 75 int __ivaliduser __P((FILE *, u_int32_t, const char *, const char *)); 76 int __ivaliduser_af __P((FILE *,const void *, const char *, const char *, 77 int, int)); 78 int __ivaliduser_sa __P((FILE *, const struct sockaddr *, socklen_t, 79 const char *,const char *)); 80 static int __icheckhost __P((const struct sockaddr *, socklen_t, 81 const char *)); 82 83 char paddr[NI_MAXHOST]; 84 85 int 86 rcmd(ahost, rport, locuser, remuser, cmd, fd2p) 87 char **ahost; 88 u_short rport; 89 const char *locuser, *remuser, *cmd; 90 int *fd2p; 91 { 92 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); 93 } 94 95 int 96 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) 97 char **ahost; 98 u_short rport; 99 const char *locuser, *remuser, *cmd; 100 int *fd2p; 101 int af; 102 { 103 struct addrinfo hints, *res, *ai; 104 struct sockaddr_storage from; 105 fd_set reads; 106 sigset_t oldmask, newmask; 107 pid_t pid; 108 int s, aport, lport, timo, error; 109 char c, *p; 110 int refused, nres; 111 char num[8]; 112 static char canonnamebuf[MAXDNAME]; /* is it proper here? */ 113 114 /* call rcmdsh() with specified remote shell if appropriate. */ 115 if (!issetugid() && (p = getenv("RSH"))) { 116 struct servent *sp = getservbyname("shell", "tcp"); 117 118 if (sp && sp->s_port == rport) 119 return (rcmdsh(ahost, rport, locuser, remuser, 120 cmd, p)); 121 } 122 123 /* use rsh(1) if non-root and remote port is shell. */ 124 if (geteuid()) { 125 struct servent *sp = getservbyname("shell", "tcp"); 126 127 if (sp && sp->s_port == rport) 128 return (rcmdsh(ahost, rport, locuser, remuser, 129 cmd, NULL)); 130 } 131 132 pid = getpid(); 133 134 memset(&hints, 0, sizeof(hints)); 135 hints.ai_flags = AI_CANONNAME; 136 hints.ai_family = af; 137 hints.ai_socktype = SOCK_STREAM; 138 hints.ai_protocol = 0; 139 (void)snprintf(num, sizeof(num), "%d", ntohs(rport)); 140 error = getaddrinfo(*ahost, num, &hints, &res); 141 if (error) { 142 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 143 gai_strerror(error)); 144 if (error == EAI_SYSTEM) 145 fprintf(stderr, "rcmd: getaddrinfo: %s\n", 146 strerror(errno)); 147 return (-1); 148 } 149 150 if (res->ai_canonname 151 && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { 152 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); 153 *ahost = canonnamebuf; 154 } 155 nres = 0; 156 for (ai = res; ai; ai = ai->ai_next) 157 nres++; 158 ai = res; 159 refused = 0; 160 sigemptyset(&newmask); 161 sigaddset(&newmask, SIGURG); 162 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 163 for (timo = 1, lport = IPPORT_RESERVED - 1;;) { 164 s = rresvport_af(&lport, ai->ai_family); 165 if (s < 0) { 166 if (errno != EAGAIN && ai->ai_next) { 167 ai = ai->ai_next; 168 continue; 169 } 170 if (errno == EAGAIN) 171 (void)fprintf(stderr, 172 "rcmd: socket: All ports in use\n"); 173 else 174 (void)fprintf(stderr, "rcmd: socket: %s\n", 175 strerror(errno)); 176 freeaddrinfo(res); 177 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 178 NULL); 179 return (-1); 180 } 181 _fcntl(s, F_SETOWN, pid); 182 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) 183 break; 184 (void)_close(s); 185 if (errno == EADDRINUSE) { 186 lport--; 187 continue; 188 } 189 if (errno == ECONNREFUSED) 190 refused = 1; 191 if (ai->ai_next == NULL && (!refused || timo > 16)) { 192 (void)fprintf(stderr, "%s: %s\n", 193 *ahost, strerror(errno)); 194 freeaddrinfo(res); 195 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, 196 NULL); 197 return (-1); 198 } 199 if (nres > 1) { 200 int oerrno = errno; 201 202 getnameinfo(ai->ai_addr, ai->ai_addrlen, 203 paddr, sizeof(paddr), 204 NULL, 0, 205 NI_NUMERICHOST|NI_WITHSCOPEID); 206 (void)fprintf(stderr, "connect to address %s: ", 207 paddr); 208 errno = oerrno; 209 perror(0); 210 } 211 if ((ai = ai->ai_next) == NULL) { 212 /* refused && timo <= 16 */ 213 struct timespec time_to_sleep, time_remaining; 214 215 time_to_sleep.tv_sec = timo; 216 time_to_sleep.tv_nsec = 0; 217 (void)_nanosleep(&time_to_sleep, &time_remaining); 218 timo *= 2; 219 ai = res; 220 refused = 0; 221 } 222 if (nres > 1) { 223 getnameinfo(ai->ai_addr, ai->ai_addrlen, 224 paddr, sizeof(paddr), 225 NULL, 0, 226 NI_NUMERICHOST|NI_WITHSCOPEID); 227 fprintf(stderr, "Trying %s...\n", paddr); 228 } 229 } 230 lport--; 231 if (fd2p == 0) { 232 _write(s, "", 1); 233 lport = 0; 234 } else { 235 char num[8]; 236 int s2 = rresvport_af(&lport, ai->ai_family), s3; 237 int len = ai->ai_addrlen; 238 int nfds; 239 240 if (s2 < 0) 241 goto bad; 242 _listen(s2, 1); 243 (void)snprintf(num, sizeof(num), "%d", lport); 244 if (_write(s, num, strlen(num)+1) != strlen(num)+1) { 245 (void)fprintf(stderr, 246 "rcmd: write (setting up stderr): %s\n", 247 strerror(errno)); 248 (void)_close(s2); 249 goto bad; 250 } 251 nfds = max(s, s2)+1; 252 if(nfds > FD_SETSIZE) { 253 fprintf(stderr, "rcmd: too many files\n"); 254 (void)_close(s2); 255 goto bad; 256 } 257 again: 258 FD_ZERO(&reads); 259 FD_SET(s, &reads); 260 FD_SET(s2, &reads); 261 errno = 0; 262 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ 263 if (errno != 0) 264 (void)fprintf(stderr, 265 "rcmd: select (setting up stderr): %s\n", 266 strerror(errno)); 267 else 268 (void)fprintf(stderr, 269 "select: protocol failure in circuit setup\n"); 270 (void)_close(s2); 271 goto bad; 272 } 273 s3 = _accept(s2, (struct sockaddr *)&from, &len); 274 switch (from.ss_family) { 275 case AF_INET: 276 aport = ntohs(((struct sockaddr_in *)&from)->sin_port); 277 break; 278 #ifdef INET6 279 case AF_INET6: 280 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); 281 break; 282 #endif 283 default: 284 aport = 0; /* error */ 285 break; 286 } 287 /* 288 * XXX careful for ftp bounce attacks. If discovered, shut them 289 * down and check for the real auxiliary channel to connect. 290 */ 291 if (aport == 20) { 292 _close(s3); 293 goto again; 294 } 295 (void)_close(s2); 296 if (s3 < 0) { 297 (void)fprintf(stderr, 298 "rcmd: accept: %s\n", strerror(errno)); 299 lport = 0; 300 goto bad; 301 } 302 *fd2p = s3; 303 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { 304 (void)fprintf(stderr, 305 "socket: protocol failure in circuit setup.\n"); 306 goto bad2; 307 } 308 } 309 (void)_write(s, locuser, strlen(locuser)+1); 310 (void)_write(s, remuser, strlen(remuser)+1); 311 (void)_write(s, cmd, strlen(cmd)+1); 312 if (_read(s, &c, 1) != 1) { 313 (void)fprintf(stderr, 314 "rcmd: %s: %s\n", *ahost, strerror(errno)); 315 goto bad2; 316 } 317 if (c != 0) { 318 while (_read(s, &c, 1) == 1) { 319 (void)_write(STDERR_FILENO, &c, 1); 320 if (c == '\n') 321 break; 322 } 323 goto bad2; 324 } 325 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 326 freeaddrinfo(res); 327 return (s); 328 bad2: 329 if (lport) 330 (void)_close(*fd2p); 331 bad: 332 (void)_close(s); 333 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); 334 freeaddrinfo(res); 335 return (-1); 336 } 337 338 int 339 rresvport(port) 340 int *port; 341 { 342 return rresvport_af(port, AF_INET); 343 } 344 345 int 346 rresvport_af(alport, family) 347 int *alport, family; 348 { 349 int i, s, len, err; 350 struct sockaddr_storage ss; 351 u_short *sport; 352 353 memset(&ss, 0, sizeof(ss)); 354 ss.ss_family = family; 355 switch (family) { 356 case AF_INET: 357 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in); 358 sport = &((struct sockaddr_in *)&ss)->sin_port; 359 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; 360 break; 361 #ifdef INET6 362 case AF_INET6: 363 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6); 364 sport = &((struct sockaddr_in6 *)&ss)->sin6_port; 365 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; 366 break; 367 #endif 368 default: 369 errno = EAFNOSUPPORT; 370 return -1; 371 } 372 373 s = _socket(ss.ss_family, SOCK_STREAM, 0); 374 if (s < 0) 375 return (-1); 376 #if 0 /* compat_exact_traditional_rresvport_semantics */ 377 sin.sin_port = htons((u_short)*alport); 378 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 379 return (s); 380 if (errno != EADDRINUSE) { 381 (void)_close(s); 382 return (-1); 383 } 384 #endif 385 *sport = 0; 386 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { 387 (void)_close(s); 388 return (-1); 389 } 390 *alport = (int)ntohs(*sport); 391 return (s); 392 } 393 394 int __check_rhosts_file = 1; 395 char *__rcmd_errstr; 396 397 int 398 ruserok(rhost, superuser, ruser, luser) 399 const char *rhost, *ruser, *luser; 400 int superuser; 401 { 402 struct addrinfo hints, *res, *r; 403 int error; 404 405 memset(&hints, 0, sizeof(hints)); 406 hints.ai_family = PF_UNSPEC; 407 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 408 error = getaddrinfo(rhost, "0", &hints, &res); 409 if (error) 410 return (-1); 411 412 for (r = res; r; r = r->ai_next) { 413 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, 414 luser) == 0) { 415 freeaddrinfo(res); 416 return (0); 417 } 418 } 419 freeaddrinfo(res); 420 return (-1); 421 } 422 423 /* 424 * New .rhosts strategy: We are passed an ip address. We spin through 425 * hosts.equiv and .rhosts looking for a match. When the .rhosts only 426 * has ip addresses, we don't have to trust a nameserver. When it 427 * contains hostnames, we spin through the list of addresses the nameserver 428 * gives us and look for a match. 429 * 430 * Returns 0 if ok, -1 if not ok. 431 */ 432 int 433 iruserok(raddr, superuser, ruser, luser) 434 unsigned long raddr; 435 int superuser; 436 const char *ruser, *luser; 437 { 438 struct sockaddr_in sin; 439 440 memset(&sin, 0, sizeof(sin)); 441 sin.sin_family = AF_INET; 442 sin.sin_len = sizeof(struct sockaddr_in); 443 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 444 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser, 445 ruser, luser); 446 } 447 448 /* 449 * AF independent extension of iruserok. 450 * 451 * Returns 0 if ok, -1 if not ok. 452 */ 453 int 454 iruserok_sa(ra, rlen, superuser, ruser, luser) 455 const void *ra; 456 int rlen; 457 int superuser; 458 const char *ruser, *luser; 459 { 460 register char *cp; 461 struct stat sbuf; 462 struct passwd *pwd; 463 FILE *hostf; 464 uid_t uid; 465 int first; 466 char pbuf[MAXPATHLEN]; 467 const struct sockaddr *raddr; 468 struct sockaddr_storage ss; 469 470 /* avoid alignment issue */ 471 if (rlen > sizeof(ss)) 472 return(-1); 473 memcpy(&ss, ra, rlen); 474 raddr = (struct sockaddr *)&ss; 475 476 first = 1; 477 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); 478 again: 479 if (hostf) { 480 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { 481 (void)fclose(hostf); 482 return (0); 483 } 484 (void)fclose(hostf); 485 } 486 if (first == 1 && (__check_rhosts_file || superuser)) { 487 first = 0; 488 if ((pwd = getpwnam(luser)) == NULL) 489 return (-1); 490 (void)strcpy(pbuf, pwd->pw_dir); 491 (void)strcat(pbuf, "/.rhosts"); 492 493 /* 494 * Change effective uid while opening .rhosts. If root and 495 * reading an NFS mounted file system, can't read files that 496 * are protected read/write owner only. 497 */ 498 uid = geteuid(); 499 (void)seteuid(pwd->pw_uid); 500 hostf = fopen(pbuf, "r"); 501 (void)seteuid(uid); 502 503 if (hostf == NULL) 504 return (-1); 505 /* 506 * If not a regular file, or is owned by someone other than 507 * user or root or if writeable by anyone but the owner, quit. 508 */ 509 cp = NULL; 510 if (lstat(pbuf, &sbuf) < 0) 511 cp = ".rhosts lstat failed"; 512 else if (!S_ISREG(sbuf.st_mode)) 513 cp = ".rhosts not regular file"; 514 else if (_fstat(fileno(hostf), &sbuf) < 0) 515 cp = ".rhosts fstat failed"; 516 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) 517 cp = "bad .rhosts owner"; 518 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) 519 cp = ".rhosts writeable by other than owner"; 520 /* If there were any problems, quit. */ 521 if (cp) { 522 __rcmd_errstr = cp; 523 (void)fclose(hostf); 524 return (-1); 525 } 526 goto again; 527 } 528 return (-1); 529 } 530 531 /* 532 * XXX 533 * Don't make static, used by lpd(8). 534 * 535 * Returns 0 if ok, -1 if not ok. 536 */ 537 int 538 __ivaliduser(hostf, raddr, luser, ruser) 539 FILE *hostf; 540 u_int32_t raddr; 541 const char *luser, *ruser; 542 { 543 struct sockaddr_in sin; 544 545 memset(&sin, 0, sizeof(sin)); 546 sin.sin_family = AF_INET; 547 sin.sin_len = sizeof(struct sockaddr_in); 548 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); 549 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len, 550 luser, ruser); 551 } 552 553 /* 554 * Returns 0 if ok, -1 if not ok. 555 * 556 * XXX obsolete API. 557 */ 558 int 559 __ivaliduser_af(hostf, raddr, luser, ruser, af, len) 560 FILE *hostf; 561 const void *raddr; 562 const char *luser, *ruser; 563 int af, len; 564 { 565 struct sockaddr *sa = NULL; 566 struct sockaddr_in *sin = NULL; 567 #ifdef INET6 568 struct sockaddr_in6 *sin6 = NULL; 569 #endif 570 struct sockaddr_storage ss; 571 572 memset(&ss, 0, sizeof(ss)); 573 switch (af) { 574 case AF_INET: 575 if (len != sizeof(sin->sin_addr)) 576 return -1; 577 sin = (struct sockaddr_in *)&ss; 578 sin->sin_family = AF_INET; 579 sin->sin_len = sizeof(struct sockaddr_in); 580 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); 581 break; 582 #ifdef INET6 583 case AF_INET6: 584 if (len != sizeof(sin6->sin6_addr)) 585 return -1; 586 /* you will lose scope info */ 587 sin6 = (struct sockaddr_in6 *)&ss; 588 sin6->sin6_family = AF_INET6; 589 sin6->sin6_len = sizeof(struct sockaddr_in6); 590 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); 591 break; 592 #endif 593 default: 594 return -1; 595 } 596 597 sa = (struct sockaddr *)&ss; 598 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser); 599 } 600 601 int 602 __ivaliduser_sa(hostf, raddr, salen, luser, ruser) 603 FILE *hostf; 604 const struct sockaddr *raddr; 605 socklen_t salen; 606 const char *luser, *ruser; 607 { 608 register char *user, *p; 609 int ch; 610 char buf[MAXHOSTNAMELEN + 128]; /* host + login */ 611 char hname[MAXHOSTNAMELEN]; 612 /* Presumed guilty until proven innocent. */ 613 int userok = 0, hostok = 0; 614 int h_error; 615 #ifdef YP 616 char *ypdomain; 617 618 if (yp_get_default_domain(&ypdomain)) 619 ypdomain = NULL; 620 #else 621 #define ypdomain NULL 622 #endif 623 /* We need to get the damn hostname back for netgroup matching. */ 624 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, 625 NI_NAMEREQD) != 0) 626 return (-1); 627 628 while (fgets(buf, sizeof(buf), hostf)) { 629 p = buf; 630 /* Skip lines that are too long. */ 631 if (strchr(p, '\n') == NULL) { 632 while ((ch = getc(hostf)) != '\n' && ch != EOF); 633 continue; 634 } 635 if (*p == '\n' || *p == '#') { 636 /* comment... */ 637 continue; 638 } 639 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { 640 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p; 641 p++; 642 } 643 if (*p == ' ' || *p == '\t') { 644 *p++ = '\0'; 645 while (*p == ' ' || *p == '\t') 646 p++; 647 user = p; 648 while (*p != '\n' && *p != ' ' && 649 *p != '\t' && *p != '\0') 650 p++; 651 } else 652 user = p; 653 *p = '\0'; 654 /* 655 * Do +/- and +@/-@ checking. This looks really nasty, 656 * but it matches SunOS's behavior so far as I can tell. 657 */ 658 switch(buf[0]) { 659 case '+': 660 if (!buf[1]) { /* '+' matches all hosts */ 661 hostok = 1; 662 break; 663 } 664 if (buf[1] == '@') /* match a host by netgroup */ 665 hostok = innetgr((char *)&buf[2], 666 (char *)&hname, NULL, ypdomain); 667 else /* match a host by addr */ 668 hostok = __icheckhost(raddr, salen, 669 (char *)&buf[1]); 670 break; 671 case '-': /* reject '-' hosts and all their users */ 672 if (buf[1] == '@') { 673 if (innetgr((char *)&buf[2], 674 (char *)&hname, NULL, ypdomain)) 675 return(-1); 676 } else { 677 if (__icheckhost(raddr, salen, 678 (char *)&buf[1])) 679 return(-1); 680 } 681 break; 682 default: /* if no '+' or '-', do a simple match */ 683 hostok = __icheckhost(raddr, salen, buf); 684 break; 685 } 686 switch(*user) { 687 case '+': 688 if (!*(user+1)) { /* '+' matches all users */ 689 userok = 1; 690 break; 691 } 692 if (*(user+1) == '@') /* match a user by netgroup */ 693 userok = innetgr(user+2, NULL, ruser, ypdomain); 694 else /* match a user by direct specification */ 695 userok = !(strcmp(ruser, user+1)); 696 break; 697 case '-': /* if we matched a hostname, */ 698 if (hostok) { /* check for user field rejections */ 699 if (!*(user+1)) 700 return(-1); 701 if (*(user+1) == '@') { 702 if (innetgr(user+2, NULL, 703 ruser, ypdomain)) 704 return(-1); 705 } else { 706 if (!strcmp(ruser, user+1)) 707 return(-1); 708 } 709 } 710 break; 711 default: /* no rejections: try to match the user */ 712 if (hostok) 713 userok = !(strcmp(ruser,*user ? user : luser)); 714 break; 715 } 716 if (hostok && userok) 717 return(0); 718 } 719 return (-1); 720 } 721 722 /* 723 * Returns "true" if match, 0 if no match. 724 * 725 * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion 726 * if af == AF_INET6. 727 */ 728 static int 729 __icheckhost(raddr, salen, lhost) 730 const struct sockaddr *raddr; 731 socklen_t salen; 732 const char *lhost; 733 { 734 struct sockaddr_in sin; 735 struct sockaddr_in6 *sin6; 736 struct addrinfo hints, *res, *r; 737 int error; 738 char h1[NI_MAXHOST], h2[NI_MAXHOST]; 739 740 if (raddr->sa_family == AF_INET6) { 741 sin6 = (struct sockaddr_in6 *)raddr; 742 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 743 memset(&sin, 0, sizeof(sin)); 744 sin.sin_family = AF_INET; 745 sin.sin_len = sizeof(struct sockaddr_in); 746 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 747 sizeof(sin.sin_addr)); 748 raddr = (struct sockaddr *)&sin; 749 salen = sin.sin_len; 750 } 751 } 752 753 h1[0] = '\0'; 754 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, 755 NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 756 return (0); 757 758 /* Resolve laddr into sockaddr */ 759 memset(&hints, 0, sizeof(hints)); 760 hints.ai_family = raddr->sa_family; 761 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ 762 res = NULL; 763 error = getaddrinfo(lhost, "0", &hints, &res); 764 if (error) 765 return (0); 766 767 for (r = res; r ; r = r->ai_next) { 768 h2[0] = '\0'; 769 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), 770 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 771 continue; 772 if (strcmp(h1, h2) == 0) { 773 freeaddrinfo(res); 774 return (1); 775 } 776 } 777 778 /* No match. */ 779 freeaddrinfo(res); 780 return (0); 781 } 782