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