1 /* 2 * Copyright (c) 1983, 1991, 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 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 /* 50 * Inetd - Internet super-server 51 * 52 * This program invokes all internet services as needed. Connection-oriented 53 * services are invoked each time a connection is made, by creating a process. 54 * This process is passed the connection as file descriptor 0 and is expected 55 * to do a getpeername to find out the source host and port. 56 * 57 * Datagram oriented services are invoked when a datagram 58 * arrives; a process is created and passed a pending message 59 * on file descriptor 0. Datagram servers may either connect 60 * to their peer, freeing up the original socket for inetd 61 * to receive further messages on, or ``take over the socket'', 62 * processing all arriving datagrams and, eventually, timing 63 * out. The first type of server is said to be ``multi-threaded''; 64 * the second type of server ``single-threaded''. 65 * 66 * Inetd uses a configuration file which is read at startup 67 * and, possibly, at some later time in response to a hangup signal. 68 * The configuration file is ``free format'' with fields given in the 69 * order shown below. Continuation lines for an entry must begin with 70 * a space or tab. All fields must be present in each entry. 71 * 72 * service name must be in /etc/services 73 * or name a tcpmux service 74 * or specify a unix domain socket 75 * socket type stream/dgram/raw/rdm/seqpacket 76 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix 77 * wait/nowait single-threaded/multi-threaded 78 * user user to run daemon as 79 * server program full path name 80 * server program arguments maximum of MAXARGS (20) 81 * 82 * TCP services without official port numbers are handled with the 83 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 84 * requests. When a connection is made from a foreign host, the service 85 * requested is passed to tcpmux, which looks it up in the servtab list 86 * and returns the proper entry for the service. Tcpmux returns a 87 * negative reply if the service doesn't exist, otherwise the invoked 88 * server is expected to return the positive reply if the service type in 89 * inetd.conf file has the prefix "tcpmux/". If the service type has the 90 * prefix "tcpmux/+", tcpmux will return the positive reply for the 91 * process; this is for compatibility with older server code, and also 92 * allows you to invoke programs that use stdin/stdout without putting any 93 * special server code in them. Services that use tcpmux are "nowait" 94 * because they do not have a well-known port and hence cannot listen 95 * for new requests. 96 * 97 * For RPC services 98 * service name/version must be in /etc/rpc 99 * socket type stream/dgram/raw/rdm/seqpacket 100 * protocol rpc/tcp[4][6], rpc/udp[4][6] 101 * wait/nowait single-threaded/multi-threaded 102 * user user to run daemon as 103 * server program full path name 104 * server program arguments maximum of MAXARGS 105 * 106 * Comment lines are indicated by a `#' in column 1. 107 * 108 * #ifdef IPSEC 109 * Comment lines that start with "#@" denote IPsec policy string, as described 110 * in ipsec_set_policy(3). This will affect all the following items in 111 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 112 * there's no IPsec policy. 113 * #endif 114 */ 115 #include <sys/param.h> 116 #include <sys/ioctl.h> 117 #include <sys/wait.h> 118 #include <sys/time.h> 119 #include <sys/resource.h> 120 #include <sys/stat.h> 121 #include <sys/un.h> 122 123 #include <netinet/in.h> 124 #include <netinet/tcp.h> 125 #include <arpa/inet.h> 126 #include <rpc/rpc.h> 127 #include <rpc/pmap_clnt.h> 128 129 #include <ctype.h> 130 #include <errno.h> 131 #include <err.h> 132 #include <fcntl.h> 133 #include <grp.h> 134 #include <libutil.h> 135 #include <limits.h> 136 #include <netdb.h> 137 #include <pwd.h> 138 #include <signal.h> 139 #include <stdio.h> 140 #include <stdlib.h> 141 #include <string.h> 142 #include <sysexits.h> 143 #include <syslog.h> 144 #include <tcpd.h> 145 #include <unistd.h> 146 147 #include "inetd.h" 148 #include "pathnames.h" 149 150 #ifdef IPSEC 151 #include <netinet6/ipsec.h> 152 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 153 #undef IPSEC 154 #endif 155 #endif 156 157 /* wrapper for KAME-special getnameinfo() */ 158 #ifndef NI_WITHSCOPEID 159 #define NI_WITHSCOPEID 0 160 #endif 161 162 #ifndef LIBWRAP_ALLOW_FACILITY 163 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 164 #endif 165 #ifndef LIBWRAP_ALLOW_SEVERITY 166 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 167 #endif 168 #ifndef LIBWRAP_DENY_FACILITY 169 # define LIBWRAP_DENY_FACILITY LOG_AUTH 170 #endif 171 #ifndef LIBWRAP_DENY_SEVERITY 172 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 173 #endif 174 175 #define ISWRAP(sep) \ 176 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 177 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 178 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 179 || (sep)->se_socktype == SOCK_DGRAM)) 180 181 #ifdef LOGIN_CAP 182 #include <login_cap.h> 183 184 /* see init.c */ 185 #define RESOURCE_RC "daemon" 186 187 #endif 188 189 #ifndef MAXCHILD 190 #define MAXCHILD -1 /* maximum number of this service 191 < 0 = no limit */ 192 #endif 193 194 #ifndef MAXCPM 195 #define MAXCPM -1 /* rate limit invocations from a 196 single remote address, 197 < 0 = no limit */ 198 #endif 199 200 #ifndef MAXPERIP 201 #define MAXPERIP -1 /* maximum number of this service 202 from a single remote address, 203 < 0 = no limit */ 204 #endif 205 206 #ifndef TOOMANY 207 #define TOOMANY 256 /* don't start more than TOOMANY */ 208 #endif 209 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 210 #define RETRYTIME (60*10) /* retry after bind or server fail */ 211 #define MAX_MAXCHLD 32767 /* max allowable max children */ 212 213 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 214 215 void close_sep(struct servtab *); 216 void flag_signal(int); 217 void flag_config(int); 218 void config(void); 219 int cpmip(const struct servtab *, int); 220 void endconfig(void); 221 struct servtab *enter(struct servtab *); 222 void freeconfig(struct servtab *); 223 struct servtab *getconfigent(void); 224 int matchservent(const char *, const char *, const char *); 225 char *nextline(FILE *); 226 void addchild(struct servtab *, int); 227 void flag_reapchild(int); 228 void reapchild(void); 229 void enable(struct servtab *); 230 void disable(struct servtab *); 231 void flag_retry(int); 232 void retry(void); 233 int setconfig(void); 234 void setup(struct servtab *); 235 #ifdef IPSEC 236 void ipsecsetup(struct servtab *); 237 #endif 238 void unregisterrpc(register struct servtab *sep); 239 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 240 static int room_conn(struct servtab *sep, struct conninfo *conn); 241 static void addchild_conn(struct conninfo *conn, pid_t pid); 242 static void reapchild_conn(pid_t pid); 243 static void free_conn(struct conninfo *conn); 244 static void resize_conn(struct servtab *sep, int maxperip); 245 static void free_connlist(struct servtab *sep); 246 static void free_proc(struct procinfo *); 247 static struct procinfo *search_proc(pid_t pid, int add); 248 static int hashval(char *p, int len); 249 250 int allow_severity; 251 int deny_severity; 252 int wrap_ex = 0; 253 int wrap_bi = 0; 254 int debug = 0; 255 int log = 0; 256 int maxsock; /* highest-numbered descriptor */ 257 fd_set allsock; 258 int options; 259 int timingout; 260 int toomany = TOOMANY; 261 int maxchild = MAXCHILD; 262 int maxcpm = MAXCPM; 263 int maxperip = MAXPERIP; 264 struct servent *sp; 265 struct rpcent *rpc; 266 char *hostname = NULL; 267 struct sockaddr_in *bind_sa4; 268 int v4bind_ok = 0; 269 #ifdef INET6 270 struct sockaddr_in6 *bind_sa6; 271 int v6bind_ok = 0; 272 #endif 273 int signalpipe[2]; 274 #ifdef SANITY_CHECK 275 int nsock; 276 #endif 277 uid_t euid; 278 gid_t egid; 279 mode_t mask; 280 281 struct servtab *servtab; 282 283 extern struct biltin biltins[]; 284 285 const char *CONFIG = _PATH_INETDCONF; 286 const char *pid_file = _PATH_INETDPID; 287 288 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 289 290 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 291 292 int 293 getvalue(const char *arg, int *value, const char *whine) 294 { 295 int tmp; 296 char *p; 297 298 tmp = strtol(arg, &p, 0); 299 if (tmp < 0 || *p) { 300 syslog(LOG_ERR, whine, arg); 301 return 1; /* failure */ 302 } 303 *value = tmp; 304 return 0; /* success */ 305 } 306 307 int 308 main(int argc, char **argv) 309 { 310 struct servtab *sep; 311 struct passwd *pwd; 312 struct group *grp; 313 struct sigaction sa, saalrm, sachld, sahup, sapipe; 314 int tmpint, ch, dofork; 315 pid_t pid; 316 char buf[50]; 317 #ifdef LOGIN_CAP 318 login_cap_t *lc = NULL; 319 #endif 320 struct request_info req; 321 int denied; 322 char *service = NULL; 323 union { 324 struct sockaddr peer_un; 325 struct sockaddr_in peer_un4; 326 struct sockaddr_in6 peer_un6; 327 struct sockaddr_storage peer_max; 328 } p_un; 329 #define peer p_un.peer_un 330 #define peer4 p_un.peer_un4 331 #define peer6 p_un.peer_un6 332 #define peermax p_un.peer_max 333 int i; 334 struct addrinfo hints, *res; 335 const char *servname; 336 int error; 337 struct conninfo *conn; 338 339 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 340 341 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 342 switch(ch) { 343 case 'd': 344 debug = 1; 345 options |= SO_DEBUG; 346 break; 347 case 'l': 348 log = 1; 349 break; 350 case 'R': 351 getvalue(optarg, &toomany, 352 "-R %s: bad value for service invocation rate"); 353 break; 354 case 'c': 355 getvalue(optarg, &maxchild, 356 "-c %s: bad value for maximum children"); 357 break; 358 case 'C': 359 getvalue(optarg, &maxcpm, 360 "-C %s: bad value for maximum children/minute"); 361 break; 362 case 'a': 363 hostname = optarg; 364 break; 365 case 'p': 366 pid_file = optarg; 367 break; 368 case 's': 369 getvalue(optarg, &maxperip, 370 "-s %s: bad value for maximum children per source address"); 371 break; 372 case 'w': 373 wrap_ex++; 374 break; 375 case 'W': 376 wrap_bi++; 377 break; 378 case '?': 379 default: 380 syslog(LOG_ERR, 381 "usage: inetd [-dlwW] [-a address] [-R rate]" 382 " [-c maximum] [-C rate]" 383 " [-p pidfile] [conf-file]"); 384 exit(EX_USAGE); 385 } 386 /* 387 * Initialize Bind Addrs. 388 * When hostname is NULL, wild card bind addrs are obtained from 389 * getaddrinfo(). But getaddrinfo() requires at least one of 390 * hostname or servname is non NULL. 391 * So when hostname is NULL, set dummy value to servname. 392 */ 393 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL; 394 395 bzero(&hints, sizeof(struct addrinfo)); 396 hints.ai_flags = AI_PASSIVE; 397 hints.ai_family = AF_UNSPEC; 398 error = getaddrinfo(hostname, servname, &hints, &res); 399 if (error != 0) { 400 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 401 if (error == EAI_SYSTEM) 402 syslog(LOG_ERR, "%s", strerror(errno)); 403 exit(EX_USAGE); 404 } 405 do { 406 if (res->ai_addr == NULL) { 407 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 408 exit(EX_USAGE); 409 } 410 switch (res->ai_addr->sa_family) { 411 case AF_INET: 412 if (v4bind_ok) 413 continue; 414 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 415 /* init port num in case servname is dummy */ 416 bind_sa4->sin_port = 0; 417 v4bind_ok = 1; 418 continue; 419 #ifdef INET6 420 case AF_INET6: 421 if (v6bind_ok) 422 continue; 423 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 424 /* init port num in case servname is dummy */ 425 bind_sa6->sin6_port = 0; 426 v6bind_ok = 1; 427 continue; 428 #endif 429 } 430 if (v4bind_ok 431 #ifdef INET6 432 && v6bind_ok 433 #endif 434 ) 435 break; 436 } while ((res = res->ai_next) != NULL); 437 if (!v4bind_ok 438 #ifdef INET6 439 && !v6bind_ok 440 #endif 441 ) { 442 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 443 exit(EX_USAGE); 444 } 445 446 euid = geteuid(); 447 egid = getegid(); 448 umask(mask = umask(0777)); 449 450 argc -= optind; 451 argv += optind; 452 453 if (argc > 0) 454 CONFIG = argv[0]; 455 if (debug == 0) { 456 FILE *fp; 457 if (daemon(0, 0) < 0) { 458 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 459 } 460 /* From now on we don't want syslog messages going to stderr. */ 461 closelog(); 462 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 463 /* 464 * In case somebody has started inetd manually, we need to 465 * clear the logname, so that old servers run as root do not 466 * get the user's logname.. 467 */ 468 if (setlogin("") < 0) { 469 syslog(LOG_WARNING, "cannot clear logname: %m"); 470 /* no big deal if it fails.. */ 471 } 472 pid = getpid(); 473 fp = fopen(pid_file, "w"); 474 if (fp) { 475 fprintf(fp, "%ld\n", (long)pid); 476 fclose(fp); 477 } else { 478 syslog(LOG_WARNING, "%s: %m", pid_file); 479 } 480 } 481 482 for (i = 0; i < PERIPSIZE; ++i) 483 LIST_INIT(&proctable[i]); 484 485 if (v4bind_ok) { 486 udpconf = getnetconfigent("udp"); 487 tcpconf = getnetconfigent("tcp"); 488 if (udpconf == NULL || tcpconf == NULL) { 489 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 490 exit(EX_USAGE); 491 } 492 } 493 #ifdef INET6 494 if (v6bind_ok) { 495 udp6conf = getnetconfigent("udp6"); 496 tcp6conf = getnetconfigent("tcp6"); 497 if (udp6conf == NULL || tcp6conf == NULL) { 498 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 499 exit(EX_USAGE); 500 } 501 } 502 #endif 503 504 sa.sa_flags = 0; 505 sigemptyset(&sa.sa_mask); 506 sigaddset(&sa.sa_mask, SIGALRM); 507 sigaddset(&sa.sa_mask, SIGCHLD); 508 sigaddset(&sa.sa_mask, SIGHUP); 509 sa.sa_handler = flag_retry; 510 sigaction(SIGALRM, &sa, &saalrm); 511 config(); 512 sa.sa_handler = flag_config; 513 sigaction(SIGHUP, &sa, &sahup); 514 sa.sa_handler = flag_reapchild; 515 sigaction(SIGCHLD, &sa, &sachld); 516 sa.sa_handler = SIG_IGN; 517 sigaction(SIGPIPE, &sa, &sapipe); 518 519 { 520 /* space for daemons to overwrite environment for ps */ 521 #define DUMMYSIZE 100 522 char dummy[DUMMYSIZE]; 523 524 (void)memset(dummy, 'x', DUMMYSIZE - 1); 525 dummy[DUMMYSIZE - 1] = '\0'; 526 (void)setenv("inetd_dummy", dummy, 1); 527 } 528 529 if (pipe(signalpipe) != 0) { 530 syslog(LOG_ERR, "pipe: %m"); 531 exit(EX_OSERR); 532 } 533 FD_SET(signalpipe[0], &allsock); 534 #ifdef SANITY_CHECK 535 nsock++; 536 #endif 537 if (signalpipe[0] > maxsock) 538 maxsock = signalpipe[0]; 539 if (signalpipe[1] > maxsock) 540 maxsock = signalpipe[1]; 541 542 for (;;) { 543 int n, ctrl; 544 fd_set readable; 545 546 #ifdef SANITY_CHECK 547 if (nsock == 0) { 548 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); 549 exit(EX_SOFTWARE); 550 } 551 #endif 552 readable = allsock; 553 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 554 (fd_set *)0, (struct timeval *)0)) <= 0) { 555 if (n < 0 && errno != EINTR) { 556 syslog(LOG_WARNING, "select: %m"); 557 sleep(1); 558 } 559 continue; 560 } 561 /* handle any queued signal flags */ 562 if (FD_ISSET(signalpipe[0], &readable)) { 563 int nsig; 564 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 565 syslog(LOG_ERR, "ioctl: %m"); 566 exit(EX_OSERR); 567 } 568 while (--nsig >= 0) { 569 char c; 570 if (read(signalpipe[0], &c, 1) != 1) { 571 syslog(LOG_ERR, "read: %m"); 572 exit(EX_OSERR); 573 } 574 if (debug) 575 warnx("handling signal flag %c", c); 576 switch(c) { 577 case 'A': /* sigalrm */ 578 retry(); 579 break; 580 case 'C': /* sigchld */ 581 reapchild(); 582 break; 583 case 'H': /* sighup */ 584 config(); 585 break; 586 } 587 } 588 } 589 for (sep = servtab; n && sep; sep = sep->se_next) 590 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 591 n--; 592 if (debug) 593 warnx("someone wants %s", sep->se_service); 594 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 595 conn = NULL; 596 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 597 i = 1; 598 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 599 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 600 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 601 (socklen_t *)0); 602 if (debug) 603 warnx("accept, ctrl %d", ctrl); 604 if (ctrl < 0) { 605 if (errno != EINTR) 606 syslog(LOG_WARNING, 607 "accept (for %s): %m", 608 sep->se_service); 609 if (sep->se_accept && 610 sep->se_socktype == SOCK_STREAM) 611 close(ctrl); 612 continue; 613 } 614 i = 0; 615 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 616 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 617 if (ioctl(ctrl, FIONBIO, &i) < 0) 618 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 619 if (cpmip(sep, ctrl) < 0) { 620 close(ctrl); 621 continue; 622 } 623 if (dofork && 624 (conn = search_conn(sep, ctrl)) != NULL && 625 !room_conn(sep, conn)) { 626 close(ctrl); 627 continue; 628 } 629 } else 630 ctrl = sep->se_fd; 631 if (log && !ISWRAP(sep)) { 632 char pname[INET6_ADDRSTRLEN] = "unknown"; 633 socklen_t sl; 634 sl = sizeof peermax; 635 if (getpeername(ctrl, (struct sockaddr *) 636 &peermax, &sl)) { 637 sl = sizeof peermax; 638 if (recvfrom(ctrl, buf, sizeof(buf), 639 MSG_PEEK, 640 (struct sockaddr *)&peermax, 641 &sl) >= 0) { 642 getnameinfo((struct sockaddr *)&peermax, 643 peer.sa_len, 644 pname, sizeof(pname), 645 NULL, 0, 646 NI_NUMERICHOST| 647 NI_WITHSCOPEID); 648 } 649 } else { 650 getnameinfo((struct sockaddr *)&peermax, 651 peer.sa_len, 652 pname, sizeof(pname), 653 NULL, 0, 654 NI_NUMERICHOST| 655 NI_WITHSCOPEID); 656 } 657 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 658 } 659 (void) sigblock(SIGBLOCK); 660 pid = 0; 661 /* 662 * Fork for all external services, builtins which need to 663 * fork and anything we're wrapping (as wrapping might 664 * block or use hosts_options(5) twist). 665 */ 666 if (dofork) { 667 if (sep->se_count++ == 0) 668 (void)gettimeofday(&sep->se_time, (struct timezone *)NULL); 669 else if (toomany > 0 && sep->se_count >= toomany) { 670 struct timeval now; 671 672 (void)gettimeofday(&now, (struct timezone *)NULL); 673 if (now.tv_sec - sep->se_time.tv_sec > 674 CNT_INTVL) { 675 sep->se_time = now; 676 sep->se_count = 1; 677 } else { 678 syslog(LOG_ERR, 679 "%s/%s server failing (looping), service terminated", 680 sep->se_service, sep->se_proto); 681 if (sep->se_accept && 682 sep->se_socktype == SOCK_STREAM) 683 close(ctrl); 684 close_sep(sep); 685 free_conn(conn); 686 sigsetmask(0L); 687 if (!timingout) { 688 timingout = 1; 689 alarm(RETRYTIME); 690 } 691 continue; 692 } 693 } 694 pid = fork(); 695 } 696 if (pid < 0) { 697 syslog(LOG_ERR, "fork: %m"); 698 if (sep->se_accept && 699 sep->se_socktype == SOCK_STREAM) 700 close(ctrl); 701 free_conn(conn); 702 sigsetmask(0L); 703 sleep(1); 704 continue; 705 } 706 if (pid) { 707 addchild_conn(conn, pid); 708 addchild(sep, pid); 709 } 710 sigsetmask(0L); 711 if (pid == 0) { 712 if (dofork) { 713 if (debug) 714 warnx("+ closing from %d", maxsock); 715 for (tmpint = maxsock; tmpint > 2; tmpint--) 716 if (tmpint != ctrl) 717 (void) close(tmpint); 718 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 719 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 720 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 721 /* SIGPIPE reset before exec */ 722 } 723 /* 724 * Call tcpmux to find the real service to exec. 725 */ 726 if (sep->se_bi && 727 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 728 sep = tcpmux(ctrl); 729 if (sep == NULL) { 730 close(ctrl); 731 _exit(0); 732 } 733 } 734 if (ISWRAP(sep)) { 735 inetd_setproctitle("wrapping", ctrl); 736 service = sep->se_server_name ? 737 sep->se_server_name : sep->se_service; 738 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL); 739 fromhost(&req); 740 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 741 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 742 denied = !hosts_access(&req); 743 if (denied) { 744 syslog(deny_severity, 745 "refused connection from %.500s, service %s (%s%s)", 746 eval_client(&req), service, sep->se_proto, 747 (((struct sockaddr *)req.client->sin)->sa_family == AF_INET6 && !IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)req.client->sin)->sin6_addr)) ? "6" : ""); 748 if (sep->se_socktype != SOCK_STREAM) 749 recv(ctrl, buf, sizeof (buf), 0); 750 if (dofork) { 751 sleep(1); 752 _exit(0); 753 } 754 } 755 if (log) { 756 syslog(allow_severity, 757 "connection from %.500s, service %s (%s%s)", 758 eval_client(&req), service, sep->se_proto, 759 (((struct sockaddr *)req.client->sin)->sa_family == AF_INET6 && !IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)req.client->sin)->sin6_addr)) ? "6" : ""); 760 } 761 } 762 if (sep->se_bi) { 763 (*sep->se_bi->bi_fn)(ctrl, sep); 764 } else { 765 if (debug) 766 warnx("%d execl %s", 767 getpid(), sep->se_server); 768 dup2(ctrl, 0); 769 close(ctrl); 770 dup2(0, 1); 771 dup2(0, 2); 772 if ((pwd = getpwnam(sep->se_user)) == NULL) { 773 syslog(LOG_ERR, 774 "%s/%s: %s: no such user", 775 sep->se_service, sep->se_proto, 776 sep->se_user); 777 if (sep->se_socktype != SOCK_STREAM) 778 recv(0, buf, sizeof (buf), 0); 779 _exit(EX_NOUSER); 780 } 781 grp = NULL; 782 if ( sep->se_group != NULL 783 && (grp = getgrnam(sep->se_group)) == NULL 784 ) { 785 syslog(LOG_ERR, 786 "%s/%s: %s: no such group", 787 sep->se_service, sep->se_proto, 788 sep->se_group); 789 if (sep->se_socktype != SOCK_STREAM) 790 recv(0, buf, sizeof (buf), 0); 791 _exit(EX_NOUSER); 792 } 793 if (grp != NULL) 794 pwd->pw_gid = grp->gr_gid; 795 #ifdef LOGIN_CAP 796 if ((lc = login_getclass(sep->se_class)) == NULL) { 797 /* error syslogged by getclass */ 798 syslog(LOG_ERR, 799 "%s/%s: %s: login class error", 800 sep->se_service, sep->se_proto, 801 sep->se_class); 802 if (sep->se_socktype != SOCK_STREAM) 803 recv(0, buf, sizeof (buf), 0); 804 _exit(EX_NOUSER); 805 } 806 #endif 807 if (setsid() < 0) { 808 syslog(LOG_ERR, 809 "%s: can't setsid(): %m", 810 sep->se_service); 811 /* _exit(EX_OSERR); not fatal yet */ 812 } 813 #ifdef LOGIN_CAP 814 if (setusercontext(lc, pwd, pwd->pw_uid, 815 LOGIN_SETALL) != 0) { 816 syslog(LOG_ERR, 817 "%s: can't setusercontext(..%s..): %m", 818 sep->se_service, sep->se_user); 819 _exit(EX_OSERR); 820 } 821 #else 822 if (pwd->pw_uid) { 823 if (setlogin(sep->se_user) < 0) { 824 syslog(LOG_ERR, 825 "%s: can't setlogin(%s): %m", 826 sep->se_service, sep->se_user); 827 /* _exit(EX_OSERR); not yet */ 828 } 829 if (setgid(pwd->pw_gid) < 0) { 830 syslog(LOG_ERR, 831 "%s: can't set gid %d: %m", 832 sep->se_service, pwd->pw_gid); 833 _exit(EX_OSERR); 834 } 835 (void) initgroups(pwd->pw_name, 836 pwd->pw_gid); 837 if (setuid(pwd->pw_uid) < 0) { 838 syslog(LOG_ERR, 839 "%s: can't set uid %d: %m", 840 sep->se_service, pwd->pw_uid); 841 _exit(EX_OSERR); 842 } 843 } 844 #endif 845 sigaction(SIGPIPE, &sapipe, 846 (struct sigaction *)0); 847 execv(sep->se_server, sep->se_argv); 848 syslog(LOG_ERR, 849 "cannot execute %s: %m", sep->se_server); 850 if (sep->se_socktype != SOCK_STREAM) 851 recv(0, buf, sizeof (buf), 0); 852 } 853 if (dofork) 854 _exit(0); 855 } 856 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 857 close(ctrl); 858 } 859 } 860 } 861 862 /* 863 * Add a signal flag to the signal flag queue for later handling 864 */ 865 866 void 867 flag_signal(int c) 868 { 869 char ch = c; 870 871 if (write(signalpipe[1], &ch, 1) != 1) { 872 syslog(LOG_ERR, "write: %m"); 873 _exit(EX_OSERR); 874 } 875 } 876 877 /* 878 * Record a new child pid for this service. If we've reached the 879 * limit on children, then stop accepting incoming requests. 880 */ 881 882 void 883 addchild(struct servtab *sep, pid_t pid) 884 { 885 if (sep->se_maxchild <= 0) 886 return; 887 #ifdef SANITY_CHECK 888 if (sep->se_numchild >= sep->se_maxchild) { 889 syslog(LOG_ERR, "%s: %d >= %d", 890 __FUNCTION__, sep->se_numchild, sep->se_maxchild); 891 exit(EX_SOFTWARE); 892 } 893 #endif 894 sep->se_pids[sep->se_numchild++] = pid; 895 if (sep->se_numchild == sep->se_maxchild) 896 disable(sep); 897 } 898 899 /* 900 * Some child process has exited. See if it's on somebody's list. 901 */ 902 903 void 904 flag_reapchild(int signo __unused) 905 { 906 flag_signal('C'); 907 } 908 909 void 910 reapchild(void) 911 { 912 int k, status; 913 pid_t pid; 914 struct servtab *sep; 915 916 for (;;) { 917 pid = wait3(&status, WNOHANG, (struct rusage *)0); 918 if (pid <= 0) 919 break; 920 if (debug) 921 warnx("%d reaped, %s %u", pid, 922 WIFEXITED(status) ? "status" : "signal", 923 WIFEXITED(status) ? WEXITSTATUS(status) 924 : WTERMSIG(status)); 925 for (sep = servtab; sep; sep = sep->se_next) { 926 for (k = 0; k < sep->se_numchild; k++) 927 if (sep->se_pids[k] == pid) 928 break; 929 if (k == sep->se_numchild) 930 continue; 931 if (sep->se_numchild == sep->se_maxchild) 932 enable(sep); 933 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 934 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 935 syslog(LOG_WARNING, 936 "%s[%d]: exited, %s %u", 937 sep->se_server, pid, 938 WIFEXITED(status) ? "status" : "signal", 939 WIFEXITED(status) ? WEXITSTATUS(status) 940 : WTERMSIG(status)); 941 break; 942 } 943 reapchild_conn(pid); 944 } 945 } 946 947 void 948 flag_config(int signo __unused) 949 { 950 flag_signal('H'); 951 } 952 953 void 954 config(void) 955 { 956 struct servtab *sep, *new, **sepp; 957 long omask; 958 int new_nomapped; 959 960 if (!setconfig()) { 961 syslog(LOG_ERR, "%s: %m", CONFIG); 962 return; 963 } 964 for (sep = servtab; sep; sep = sep->se_next) 965 sep->se_checked = 0; 966 while ((new = getconfigent())) { 967 if (getpwnam(new->se_user) == NULL) { 968 syslog(LOG_ERR, 969 "%s/%s: no such user '%s', service ignored", 970 new->se_service, new->se_proto, new->se_user); 971 continue; 972 } 973 if (new->se_group && getgrnam(new->se_group) == NULL) { 974 syslog(LOG_ERR, 975 "%s/%s: no such group '%s', service ignored", 976 new->se_service, new->se_proto, new->se_group); 977 continue; 978 } 979 #ifdef LOGIN_CAP 980 if (login_getclass(new->se_class) == NULL) { 981 /* error syslogged by getclass */ 982 syslog(LOG_ERR, 983 "%s/%s: %s: login class error, service ignored", 984 new->se_service, new->se_proto, new->se_class); 985 continue; 986 } 987 #endif 988 new_nomapped = new->se_nomapped; 989 for (sep = servtab; sep; sep = sep->se_next) 990 if (strcmp(sep->se_service, new->se_service) == 0 && 991 strcmp(sep->se_proto, new->se_proto) == 0 && 992 sep->se_rpc == new->se_rpc && 993 sep->se_socktype == new->se_socktype && 994 sep->se_family == new->se_family) 995 break; 996 if (sep != 0) { 997 int i; 998 999 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 1000 omask = sigblock(SIGBLOCK); 1001 if (sep->se_nomapped != new->se_nomapped) { 1002 /* for rpc keep old nommaped till unregister */ 1003 if (!sep->se_rpc) 1004 sep->se_nomapped = new->se_nomapped; 1005 sep->se_reset = 1; 1006 } 1007 /* copy over outstanding child pids */ 1008 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1009 new->se_numchild = sep->se_numchild; 1010 if (new->se_numchild > new->se_maxchild) 1011 new->se_numchild = new->se_maxchild; 1012 memcpy(new->se_pids, sep->se_pids, 1013 new->se_numchild * sizeof(*new->se_pids)); 1014 } 1015 SWAP(pid_t *, sep->se_pids, new->se_pids); 1016 sep->se_maxchild = new->se_maxchild; 1017 sep->se_numchild = new->se_numchild; 1018 sep->se_maxcpm = new->se_maxcpm; 1019 resize_conn(sep, new->se_maxperip); 1020 sep->se_maxperip = new->se_maxperip; 1021 sep->se_bi = new->se_bi; 1022 /* might need to turn on or off service now */ 1023 if (sep->se_fd >= 0) { 1024 if (sep->se_maxchild > 0 1025 && sep->se_numchild == sep->se_maxchild) { 1026 if (FD_ISSET(sep->se_fd, &allsock)) 1027 disable(sep); 1028 } else { 1029 if (!FD_ISSET(sep->se_fd, &allsock)) 1030 enable(sep); 1031 } 1032 } 1033 sep->se_accept = new->se_accept; 1034 SWAP(char *, sep->se_user, new->se_user); 1035 SWAP(char *, sep->se_group, new->se_group); 1036 #ifdef LOGIN_CAP 1037 SWAP(char *, sep->se_class, new->se_class); 1038 #endif 1039 SWAP(char *, sep->se_server, new->se_server); 1040 SWAP(char *, sep->se_server_name, new->se_server_name); 1041 for (i = 0; i < MAXARGV; i++) 1042 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1043 #ifdef IPSEC 1044 SWAP(char *, sep->se_policy, new->se_policy); 1045 ipsecsetup(sep); 1046 #endif 1047 sigsetmask(omask); 1048 freeconfig(new); 1049 if (debug) 1050 print_service("REDO", sep); 1051 } else { 1052 sep = enter(new); 1053 if (debug) 1054 print_service("ADD ", sep); 1055 } 1056 sep->se_checked = 1; 1057 if (ISMUX(sep)) { 1058 sep->se_fd = -1; 1059 continue; 1060 } 1061 switch (sep->se_family) { 1062 case AF_INET: 1063 if (!v4bind_ok) { 1064 sep->se_fd = -1; 1065 continue; 1066 } 1067 break; 1068 #ifdef INET6 1069 case AF_INET6: 1070 if (!v6bind_ok) { 1071 sep->se_fd = -1; 1072 continue; 1073 } 1074 break; 1075 #endif 1076 } 1077 if (!sep->se_rpc) { 1078 if (sep->se_family != AF_UNIX) { 1079 sp = getservbyname(sep->se_service, sep->se_proto); 1080 if (sp == 0) { 1081 syslog(LOG_ERR, "%s/%s: unknown service", 1082 sep->se_service, sep->se_proto); 1083 sep->se_checked = 0; 1084 continue; 1085 } 1086 } 1087 switch (sep->se_family) { 1088 case AF_INET: 1089 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1090 sep->se_ctrladdr4.sin_port = 1091 sp->s_port; 1092 sep->se_reset = 1; 1093 } 1094 break; 1095 #ifdef INET6 1096 case AF_INET6: 1097 if (sp->s_port != 1098 sep->se_ctrladdr6.sin6_port) { 1099 sep->se_ctrladdr6.sin6_port = 1100 sp->s_port; 1101 sep->se_reset = 1; 1102 } 1103 break; 1104 #endif 1105 } 1106 if (sep->se_reset != 0 && sep->se_fd >= 0) 1107 close_sep(sep); 1108 } else { 1109 rpc = getrpcbyname(sep->se_service); 1110 if (rpc == 0) { 1111 syslog(LOG_ERR, "%s/%s unknown RPC service", 1112 sep->se_service, sep->se_proto); 1113 if (sep->se_fd != -1) 1114 (void) close(sep->se_fd); 1115 sep->se_fd = -1; 1116 continue; 1117 } 1118 if (sep->se_reset != 0 || 1119 rpc->r_number != sep->se_rpc_prog) { 1120 if (sep->se_rpc_prog) 1121 unregisterrpc(sep); 1122 sep->se_rpc_prog = rpc->r_number; 1123 if (sep->se_fd != -1) 1124 (void) close(sep->se_fd); 1125 sep->se_fd = -1; 1126 } 1127 sep->se_nomapped = new_nomapped; 1128 } 1129 sep->se_reset = 0; 1130 if (sep->se_fd == -1) 1131 setup(sep); 1132 } 1133 endconfig(); 1134 /* 1135 * Purge anything not looked at above. 1136 */ 1137 omask = sigblock(SIGBLOCK); 1138 sepp = &servtab; 1139 while ((sep = *sepp)) { 1140 if (sep->se_checked) { 1141 sepp = &sep->se_next; 1142 continue; 1143 } 1144 *sepp = sep->se_next; 1145 if (sep->se_fd >= 0) 1146 close_sep(sep); 1147 if (debug) 1148 print_service("FREE", sep); 1149 if (sep->se_rpc && sep->se_rpc_prog > 0) 1150 unregisterrpc(sep); 1151 freeconfig(sep); 1152 free(sep); 1153 } 1154 (void) sigsetmask(omask); 1155 } 1156 1157 void 1158 unregisterrpc(struct servtab *sep) 1159 { 1160 u_int i; 1161 struct servtab *sepp; 1162 long omask; 1163 struct netconfig *netid4, *netid6; 1164 1165 omask = sigblock(SIGBLOCK); 1166 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1167 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1168 if (sep->se_family == AF_INET) 1169 netid6 = NULL; 1170 else if (sep->se_nomapped) 1171 netid4 = NULL; 1172 /* 1173 * Conflict if same prog and protocol - In that case one should look 1174 * to versions, but it is not interesting: having separate servers for 1175 * different versions does not work well. 1176 * Therefore one do not unregister if there is a conflict. 1177 * There is also transport conflict if destroying INET when INET46 1178 * exists, or destroying INET46 when INET exists 1179 */ 1180 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1181 if (sepp == sep) 1182 continue; 1183 if (sepp->se_checked == 0 || 1184 !sepp->se_rpc || 1185 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1186 sep->se_rpc_prog != sepp->se_rpc_prog) 1187 continue; 1188 if (sepp->se_family == AF_INET) 1189 netid4 = NULL; 1190 if (sepp->se_family == AF_INET6) { 1191 netid6 = NULL; 1192 if (!sep->se_nomapped) 1193 netid4 = NULL; 1194 } 1195 if (netid4 == NULL && netid6 == NULL) 1196 return; 1197 } 1198 if (debug) 1199 print_service("UNREG", sep); 1200 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1201 if (netid4) 1202 rpcb_unset(sep->se_rpc_prog, i, netid4); 1203 if (netid6) 1204 rpcb_unset(sep->se_rpc_prog, i, netid6); 1205 } 1206 if (sep->se_fd != -1) 1207 (void) close(sep->se_fd); 1208 sep->se_fd = -1; 1209 (void) sigsetmask(omask); 1210 } 1211 1212 void 1213 flag_retry(int signo __unused) 1214 { 1215 flag_signal('A'); 1216 } 1217 1218 void 1219 retry(void) 1220 { 1221 struct servtab *sep; 1222 1223 timingout = 0; 1224 for (sep = servtab; sep; sep = sep->se_next) 1225 if (sep->se_fd == -1 && !ISMUX(sep)) 1226 setup(sep); 1227 } 1228 1229 void 1230 setup(struct servtab *sep) 1231 { 1232 int on = 1; 1233 1234 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1235 if (debug) 1236 warn("socket failed on %s/%s", 1237 sep->se_service, sep->se_proto); 1238 syslog(LOG_ERR, "%s/%s: socket: %m", 1239 sep->se_service, sep->se_proto); 1240 return; 1241 } 1242 #define turnon(fd, opt) \ 1243 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1244 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1245 turnon(sep->se_fd, SO_DEBUG) < 0) 1246 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1247 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1248 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1249 #ifdef SO_PRIVSTATE 1250 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1251 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1252 #endif 1253 /* tftpd opens a new connection then needs more infos */ 1254 if ((sep->se_family == AF_INET6) && 1255 (strcmp(sep->se_proto, "udp") == 0) && 1256 (sep->se_accept == 0) && 1257 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO, 1258 (char *)&on, sizeof (on)) < 0)) 1259 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1260 if (sep->se_family == AF_INET6) { 1261 int flag = sep->se_nomapped ? 1 : 0; 1262 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1263 (char *)&flag, sizeof (flag)) < 0) 1264 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1265 } 1266 #undef turnon 1267 if (sep->se_type == TTCP_TYPE) 1268 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, 1269 (char *)&on, sizeof (on)) < 0) 1270 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); 1271 #ifdef IPV6_FAITH 1272 if (sep->se_type == FAITH_TYPE) { 1273 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1274 sizeof(on)) < 0) { 1275 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1276 } 1277 } 1278 #endif 1279 #ifdef IPSEC 1280 ipsecsetup(sep); 1281 #endif 1282 if (sep->se_family == AF_UNIX) { 1283 (void) unlink(sep->se_ctrladdr_un.sun_path); 1284 umask(0777); /* Make socket with conservative permissions */ 1285 } 1286 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1287 sep->se_ctrladdr_size) < 0) { 1288 if (debug) 1289 warn("bind failed on %s/%s", 1290 sep->se_service, sep->se_proto); 1291 syslog(LOG_ERR, "%s/%s: bind: %m", 1292 sep->se_service, sep->se_proto); 1293 (void) close(sep->se_fd); 1294 sep->se_fd = -1; 1295 if (!timingout) { 1296 timingout = 1; 1297 alarm(RETRYTIME); 1298 } 1299 if (sep->se_family == AF_UNIX) 1300 umask(mask); 1301 return; 1302 } 1303 if (sep->se_family == AF_UNIX) { 1304 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1305 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1306 syslog(LOG_ERR, "chown socket: %m"); 1307 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1308 syslog(LOG_ERR, "chmod socket: %m"); 1309 umask(mask); 1310 } 1311 if (sep->se_rpc) { 1312 u_int i; 1313 socklen_t len = sep->se_ctrladdr_size; 1314 struct netconfig *netid, *netid2 = NULL; 1315 struct sockaddr_in sock; 1316 struct netbuf nbuf, nbuf2; 1317 1318 if (getsockname(sep->se_fd, 1319 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1320 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1321 sep->se_service, sep->se_proto); 1322 (void) close(sep->se_fd); 1323 sep->se_fd = -1; 1324 return; 1325 } 1326 nbuf.buf = &sep->se_ctrladdr; 1327 nbuf.len = sep->se_ctrladdr.sa_len; 1328 if (sep->se_family == AF_INET) 1329 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1330 else { 1331 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1332 if (!sep->se_nomapped) { /* INET and INET6 */ 1333 netid2 = netid==udp6conf? udpconf:tcpconf; 1334 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1335 nbuf2.buf = &sock; 1336 nbuf2.len = sock.sin_len = sizeof sock; 1337 sock.sin_family = AF_INET; 1338 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1339 } 1340 } 1341 if (debug) 1342 print_service("REG ", sep); 1343 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1344 rpcb_unset(sep->se_rpc_prog, i, netid); 1345 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1346 if (netid2) { 1347 rpcb_unset(sep->se_rpc_prog, i, netid2); 1348 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1349 } 1350 } 1351 } 1352 if (sep->se_socktype == SOCK_STREAM) 1353 listen(sep->se_fd, 64); 1354 enable(sep); 1355 if (debug) { 1356 warnx("registered %s on %d", 1357 sep->se_server, sep->se_fd); 1358 } 1359 } 1360 1361 #ifdef IPSEC 1362 void 1363 ipsecsetup(sep) 1364 struct servtab *sep; 1365 { 1366 char *buf; 1367 char *policy_in = NULL; 1368 char *policy_out = NULL; 1369 int level; 1370 int opt; 1371 1372 switch (sep->se_family) { 1373 case AF_INET: 1374 level = IPPROTO_IP; 1375 opt = IP_IPSEC_POLICY; 1376 break; 1377 #ifdef INET6 1378 case AF_INET6: 1379 level = IPPROTO_IPV6; 1380 opt = IPV6_IPSEC_POLICY; 1381 break; 1382 #endif 1383 default: 1384 return; 1385 } 1386 1387 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1388 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1389 policy_in = def_in; 1390 policy_out = def_out; 1391 } else { 1392 if (!strncmp("in", sep->se_policy, 2)) 1393 policy_in = sep->se_policy; 1394 else if (!strncmp("out", sep->se_policy, 3)) 1395 policy_out = sep->se_policy; 1396 else { 1397 syslog(LOG_ERR, "invalid security policy \"%s\"", 1398 sep->se_policy); 1399 return; 1400 } 1401 } 1402 1403 if (policy_in != NULL) { 1404 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1405 if (buf != NULL) { 1406 if (setsockopt(sep->se_fd, level, opt, 1407 buf, ipsec_get_policylen(buf)) < 0 && 1408 debug != 0) 1409 warnx("%s/%s: ipsec initialization failed; %s", 1410 sep->se_service, sep->se_proto, 1411 policy_in); 1412 free(buf); 1413 } else 1414 syslog(LOG_ERR, "invalid security policy \"%s\"", 1415 policy_in); 1416 } 1417 if (policy_out != NULL) { 1418 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1419 if (buf != NULL) { 1420 if (setsockopt(sep->se_fd, level, opt, 1421 buf, ipsec_get_policylen(buf)) < 0 && 1422 debug != 0) 1423 warnx("%s/%s: ipsec initialization failed; %s", 1424 sep->se_service, sep->se_proto, 1425 policy_out); 1426 free(buf); 1427 } else 1428 syslog(LOG_ERR, "invalid security policy \"%s\"", 1429 policy_out); 1430 } 1431 } 1432 #endif 1433 1434 /* 1435 * Finish with a service and its socket. 1436 */ 1437 void 1438 close_sep(struct servtab *sep) 1439 { 1440 if (sep->se_fd >= 0) { 1441 if (FD_ISSET(sep->se_fd, &allsock)) 1442 disable(sep); 1443 (void) close(sep->se_fd); 1444 sep->se_fd = -1; 1445 } 1446 sep->se_count = 0; 1447 sep->se_numchild = 0; /* forget about any existing children */ 1448 } 1449 1450 int 1451 matchservent(const char *name1, const char *name2, const char *proto) 1452 { 1453 char **alias, *p; 1454 struct servent *se; 1455 1456 if (strcmp(proto, "unix") == 0) { 1457 if ((p = strrchr(name1, '/')) != NULL) 1458 name1 = p + 1; 1459 if ((p = strrchr(name2, '/')) != NULL) 1460 name2 = p + 1; 1461 } 1462 if (strcmp(name1, name2) == 0) 1463 return(1); 1464 if ((se = getservbyname(name1, proto)) != NULL) { 1465 if (strcmp(name2, se->s_name) == 0) 1466 return(1); 1467 for (alias = se->s_aliases; *alias; alias++) 1468 if (strcmp(name2, *alias) == 0) 1469 return(1); 1470 } 1471 return(0); 1472 } 1473 1474 struct servtab * 1475 enter(struct servtab *cp) 1476 { 1477 struct servtab *sep; 1478 long omask; 1479 1480 sep = (struct servtab *)malloc(sizeof (*sep)); 1481 if (sep == (struct servtab *)0) { 1482 syslog(LOG_ERR, "malloc: %m"); 1483 exit(EX_OSERR); 1484 } 1485 *sep = *cp; 1486 sep->se_fd = -1; 1487 omask = sigblock(SIGBLOCK); 1488 sep->se_next = servtab; 1489 servtab = sep; 1490 sigsetmask(omask); 1491 return (sep); 1492 } 1493 1494 void 1495 enable(struct servtab *sep) 1496 { 1497 if (debug) 1498 warnx( 1499 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1500 #ifdef SANITY_CHECK 1501 if (sep->se_fd < 0) { 1502 syslog(LOG_ERR, 1503 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 1504 exit(EX_SOFTWARE); 1505 } 1506 if (ISMUX(sep)) { 1507 syslog(LOG_ERR, 1508 "%s: %s: is mux", __FUNCTION__, sep->se_service); 1509 exit(EX_SOFTWARE); 1510 } 1511 if (FD_ISSET(sep->se_fd, &allsock)) { 1512 syslog(LOG_ERR, 1513 "%s: %s: not off", __FUNCTION__, sep->se_service); 1514 exit(EX_SOFTWARE); 1515 } 1516 nsock++; 1517 #endif 1518 FD_SET(sep->se_fd, &allsock); 1519 if (sep->se_fd > maxsock) 1520 maxsock = sep->se_fd; 1521 } 1522 1523 void 1524 disable(struct servtab *sep) 1525 { 1526 if (debug) 1527 warnx( 1528 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1529 #ifdef SANITY_CHECK 1530 if (sep->se_fd < 0) { 1531 syslog(LOG_ERR, 1532 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 1533 exit(EX_SOFTWARE); 1534 } 1535 if (ISMUX(sep)) { 1536 syslog(LOG_ERR, 1537 "%s: %s: is mux", __FUNCTION__, sep->se_service); 1538 exit(EX_SOFTWARE); 1539 } 1540 if (!FD_ISSET(sep->se_fd, &allsock)) { 1541 syslog(LOG_ERR, 1542 "%s: %s: not on", __FUNCTION__, sep->se_service); 1543 exit(EX_SOFTWARE); 1544 } 1545 if (nsock == 0) { 1546 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); 1547 exit(EX_SOFTWARE); 1548 } 1549 nsock--; 1550 #endif 1551 FD_CLR(sep->se_fd, &allsock); 1552 if (sep->se_fd == maxsock) 1553 maxsock--; 1554 } 1555 1556 FILE *fconfig = NULL; 1557 struct servtab serv; 1558 char line[LINE_MAX]; 1559 1560 int 1561 setconfig(void) 1562 { 1563 1564 if (fconfig != NULL) { 1565 fseek(fconfig, 0L, SEEK_SET); 1566 return (1); 1567 } 1568 fconfig = fopen(CONFIG, "r"); 1569 return (fconfig != NULL); 1570 } 1571 1572 void 1573 endconfig(void) 1574 { 1575 if (fconfig) { 1576 (void) fclose(fconfig); 1577 fconfig = NULL; 1578 } 1579 } 1580 1581 struct servtab * 1582 getconfigent(void) 1583 { 1584 struct servtab *sep = &serv; 1585 int argc; 1586 char *cp, *arg, *s; 1587 char *versp; 1588 static char TCPMUX_TOKEN[] = "tcpmux/"; 1589 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1590 #ifdef IPSEC 1591 char *policy; 1592 #endif 1593 int v4bind; 1594 #ifdef INET6 1595 int v6bind; 1596 #endif 1597 int i; 1598 1599 #ifdef IPSEC 1600 policy = NULL; 1601 #endif 1602 more: 1603 v4bind = 0; 1604 #ifdef INET6 1605 v6bind = 0; 1606 #endif 1607 while ((cp = nextline(fconfig)) != NULL) { 1608 #ifdef IPSEC 1609 /* lines starting with #@ is not a comment, but the policy */ 1610 if (cp[0] == '#' && cp[1] == '@') { 1611 char *p; 1612 for (p = cp + 2; p && *p && isspace(*p); p++) 1613 ; 1614 if (*p == '\0') { 1615 if (policy) 1616 free(policy); 1617 policy = NULL; 1618 } else if (ipsec_get_policylen(p) >= 0) { 1619 if (policy) 1620 free(policy); 1621 policy = newstr(p); 1622 } else { 1623 syslog(LOG_ERR, 1624 "%s: invalid ipsec policy \"%s\"", 1625 CONFIG, p); 1626 exit(EX_CONFIG); 1627 } 1628 } 1629 #endif 1630 if (*cp == '#' || *cp == '\0') 1631 continue; 1632 break; 1633 } 1634 if (cp == NULL) 1635 return ((struct servtab *)0); 1636 /* 1637 * clear the static buffer, since some fields (se_ctrladdr, 1638 * for example) don't get initialized here. 1639 */ 1640 memset(sep, 0, sizeof *sep); 1641 arg = skip(&cp); 1642 if (cp == NULL) { 1643 /* got an empty line containing just blanks/tabs. */ 1644 goto more; 1645 } 1646 if (arg[0] == ':') { /* :user:group:perm: */ 1647 char *user, *group, *perm; 1648 struct passwd *pw; 1649 struct group *gr; 1650 user = arg+1; 1651 if ((group = strchr(user, ':')) == NULL) { 1652 syslog(LOG_ERR, "no group after user '%s'", user); 1653 goto more; 1654 } 1655 *group++ = '\0'; 1656 if ((perm = strchr(group, ':')) == NULL) { 1657 syslog(LOG_ERR, "no mode after group '%s'", group); 1658 goto more; 1659 } 1660 *perm++ = '\0'; 1661 if ((pw = getpwnam(user)) == NULL) { 1662 syslog(LOG_ERR, "no such user '%s'", user); 1663 goto more; 1664 } 1665 sep->se_sockuid = pw->pw_uid; 1666 if ((gr = getgrnam(group)) == NULL) { 1667 syslog(LOG_ERR, "no such user '%s'", group); 1668 goto more; 1669 } 1670 sep->se_sockgid = gr->gr_gid; 1671 sep->se_sockmode = strtol(perm, &arg, 8); 1672 if (*arg != ':') { 1673 syslog(LOG_ERR, "bad mode '%s'", perm); 1674 goto more; 1675 } 1676 *arg++ = '\0'; 1677 } else { 1678 sep->se_sockuid = euid; 1679 sep->se_sockgid = egid; 1680 sep->se_sockmode = 0200; 1681 } 1682 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1683 char *c = arg + MUX_LEN; 1684 if (*c == '+') { 1685 sep->se_type = MUXPLUS_TYPE; 1686 c++; 1687 } else 1688 sep->se_type = MUX_TYPE; 1689 sep->se_service = newstr(c); 1690 } else { 1691 sep->se_service = newstr(arg); 1692 sep->se_type = NORM_TYPE; 1693 } 1694 arg = sskip(&cp); 1695 if (strcmp(arg, "stream") == 0) 1696 sep->se_socktype = SOCK_STREAM; 1697 else if (strcmp(arg, "dgram") == 0) 1698 sep->se_socktype = SOCK_DGRAM; 1699 else if (strcmp(arg, "rdm") == 0) 1700 sep->se_socktype = SOCK_RDM; 1701 else if (strcmp(arg, "seqpacket") == 0) 1702 sep->se_socktype = SOCK_SEQPACKET; 1703 else if (strcmp(arg, "raw") == 0) 1704 sep->se_socktype = SOCK_RAW; 1705 else 1706 sep->se_socktype = -1; 1707 1708 arg = sskip(&cp); 1709 if (strncmp(arg, "tcp", 3) == 0) { 1710 sep->se_proto = newstr(strsep(&arg, "/")); 1711 if (arg != NULL) { 1712 if (strcmp(arg, "ttcp") == 0) 1713 sep->se_type = TTCP_TYPE; 1714 else if (strcmp(arg, "faith") == 0) 1715 sep->se_type = FAITH_TYPE; 1716 } 1717 } else { 1718 if (sep->se_type == NORM_TYPE && 1719 strncmp(arg, "faith/", 6) == 0) { 1720 arg += 6; 1721 sep->se_type = FAITH_TYPE; 1722 } 1723 sep->se_proto = newstr(arg); 1724 } 1725 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1726 memmove(sep->se_proto, sep->se_proto + 4, 1727 strlen(sep->se_proto) + 1 - 4); 1728 sep->se_rpc = 1; 1729 sep->se_rpc_prog = sep->se_rpc_lowvers = 1730 sep->se_rpc_lowvers = 0; 1731 memcpy(&sep->se_ctrladdr4, bind_sa4, 1732 sizeof(sep->se_ctrladdr4)); 1733 if ((versp = rindex(sep->se_service, '/'))) { 1734 *versp++ = '\0'; 1735 switch (sscanf(versp, "%u-%u", 1736 &sep->se_rpc_lowvers, 1737 &sep->se_rpc_highvers)) { 1738 case 2: 1739 break; 1740 case 1: 1741 sep->se_rpc_highvers = 1742 sep->se_rpc_lowvers; 1743 break; 1744 default: 1745 syslog(LOG_ERR, 1746 "bad RPC version specifier; %s", 1747 sep->se_service); 1748 freeconfig(sep); 1749 goto more; 1750 } 1751 } 1752 else { 1753 sep->se_rpc_lowvers = 1754 sep->se_rpc_highvers = 1; 1755 } 1756 } 1757 sep->se_nomapped = 0; 1758 if (strcmp(sep->se_proto, "unix") == 0) { 1759 sep->se_family = AF_UNIX; 1760 } else { 1761 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1762 #ifdef INET6 1763 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1764 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1765 v6bind = 1; 1766 continue; 1767 } 1768 #endif 1769 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1770 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1771 v4bind = 1; 1772 continue; 1773 } 1774 /* illegal version num */ 1775 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1776 freeconfig(sep); 1777 goto more; 1778 } 1779 #ifdef INET6 1780 if (v6bind && !v6bind_ok) { 1781 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1782 sep->se_service); 1783 if (v4bind && v4bind_ok) 1784 v6bind = 0; 1785 else { 1786 freeconfig(sep); 1787 goto more; 1788 } 1789 } 1790 if (v6bind) { 1791 sep->se_family = AF_INET6; 1792 if (!v4bind || !v4bind_ok) 1793 sep->se_nomapped = 1; 1794 } else 1795 #endif 1796 { /* default to v4 bind if not v6 bind */ 1797 if (!v4bind_ok) { 1798 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1799 sep->se_service); 1800 freeconfig(sep); 1801 goto more; 1802 } 1803 sep->se_family = AF_INET; 1804 } 1805 } 1806 /* init ctladdr */ 1807 switch(sep->se_family) { 1808 case AF_INET: 1809 memcpy(&sep->se_ctrladdr4, bind_sa4, 1810 sizeof(sep->se_ctrladdr4)); 1811 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1812 break; 1813 #ifdef INET6 1814 case AF_INET6: 1815 memcpy(&sep->se_ctrladdr6, bind_sa6, 1816 sizeof(sep->se_ctrladdr6)); 1817 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1818 break; 1819 #endif 1820 case AF_UNIX: 1821 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1822 syslog(LOG_ERR, 1823 "domain socket pathname too long for service %s", 1824 sep->se_service); 1825 goto more; 1826 } 1827 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1828 sep->se_ctrladdr_un.sun_family = sep->se_family; 1829 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1830 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1831 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1832 } 1833 arg = sskip(&cp); 1834 if (!strncmp(arg, "wait", 4)) 1835 sep->se_accept = 0; 1836 else if (!strncmp(arg, "nowait", 6)) 1837 sep->se_accept = 1; 1838 else { 1839 syslog(LOG_ERR, 1840 "%s: bad wait/nowait for service %s", 1841 CONFIG, sep->se_service); 1842 goto more; 1843 } 1844 sep->se_maxchild = -1; 1845 sep->se_maxcpm = -1; 1846 sep->se_maxperip = -1; 1847 if ((s = strchr(arg, '/')) != NULL) { 1848 char *eptr; 1849 u_long val; 1850 1851 val = strtoul(s + 1, &eptr, 10); 1852 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1853 syslog(LOG_ERR, 1854 "%s: bad max-child for service %s", 1855 CONFIG, sep->se_service); 1856 goto more; 1857 } 1858 if (debug) 1859 if (!sep->se_accept && val != 1) 1860 warnx("maxchild=%lu for wait service %s" 1861 " not recommended", val, sep->se_service); 1862 sep->se_maxchild = val; 1863 if (*eptr == '/') 1864 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1865 if (*eptr == '/') 1866 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1867 /* 1868 * explicitly do not check for \0 for future expansion / 1869 * backwards compatibility 1870 */ 1871 } 1872 if (ISMUX(sep)) { 1873 /* 1874 * Silently enforce "nowait" mode for TCPMUX services 1875 * since they don't have an assigned port to listen on. 1876 */ 1877 sep->se_accept = 1; 1878 if (strcmp(sep->se_proto, "tcp")) { 1879 syslog(LOG_ERR, 1880 "%s: bad protocol for tcpmux service %s", 1881 CONFIG, sep->se_service); 1882 goto more; 1883 } 1884 if (sep->se_socktype != SOCK_STREAM) { 1885 syslog(LOG_ERR, 1886 "%s: bad socket type for tcpmux service %s", 1887 CONFIG, sep->se_service); 1888 goto more; 1889 } 1890 } 1891 sep->se_user = newstr(sskip(&cp)); 1892 #ifdef LOGIN_CAP 1893 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1894 *s = '\0'; 1895 sep->se_class = newstr(s + 1); 1896 } else 1897 sep->se_class = newstr(RESOURCE_RC); 1898 #endif 1899 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1900 *s = '\0'; 1901 sep->se_group = newstr(s + 1); 1902 } else 1903 sep->se_group = NULL; 1904 sep->se_server = newstr(sskip(&cp)); 1905 if ((sep->se_server_name = rindex(sep->se_server, '/'))) 1906 sep->se_server_name++; 1907 if (strcmp(sep->se_server, "internal") == 0) { 1908 struct biltin *bi; 1909 1910 for (bi = biltins; bi->bi_service; bi++) 1911 if (bi->bi_socktype == sep->se_socktype && 1912 matchservent(bi->bi_service, sep->se_service, 1913 sep->se_proto)) 1914 break; 1915 if (bi->bi_service == 0) { 1916 syslog(LOG_ERR, "internal service %s unknown", 1917 sep->se_service); 1918 goto more; 1919 } 1920 sep->se_accept = 1; /* force accept mode for built-ins */ 1921 sep->se_bi = bi; 1922 } else 1923 sep->se_bi = NULL; 1924 if (sep->se_maxperip < 0) 1925 sep->se_maxperip = maxperip; 1926 if (sep->se_maxcpm < 0) 1927 sep->se_maxcpm = maxcpm; 1928 if (sep->se_maxchild < 0) { /* apply default max-children */ 1929 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1930 sep->se_maxchild = sep->se_bi->bi_maxchild; 1931 else if (sep->se_accept) 1932 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1933 else 1934 sep->se_maxchild = 1; 1935 } 1936 if (sep->se_maxchild > 0) { 1937 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1938 if (sep->se_pids == NULL) { 1939 syslog(LOG_ERR, "malloc: %m"); 1940 exit(EX_OSERR); 1941 } 1942 } 1943 argc = 0; 1944 for (arg = skip(&cp); cp; arg = skip(&cp)) 1945 if (argc < MAXARGV) { 1946 sep->se_argv[argc++] = newstr(arg); 1947 } else { 1948 syslog(LOG_ERR, 1949 "%s: too many arguments for service %s", 1950 CONFIG, sep->se_service); 1951 goto more; 1952 } 1953 while (argc <= MAXARGV) 1954 sep->se_argv[argc++] = NULL; 1955 for (i = 0; i < PERIPSIZE; ++i) 1956 LIST_INIT(&sep->se_conn[i]); 1957 #ifdef IPSEC 1958 sep->se_policy = policy ? newstr(policy) : NULL; 1959 #endif 1960 return (sep); 1961 } 1962 1963 void 1964 freeconfig(struct servtab *cp) 1965 { 1966 int i; 1967 1968 if (cp->se_service) 1969 free(cp->se_service); 1970 if (cp->se_proto) 1971 free(cp->se_proto); 1972 if (cp->se_user) 1973 free(cp->se_user); 1974 if (cp->se_group) 1975 free(cp->se_group); 1976 #ifdef LOGIN_CAP 1977 if (cp->se_class) 1978 free(cp->se_class); 1979 #endif 1980 if (cp->se_server) 1981 free(cp->se_server); 1982 if (cp->se_pids) 1983 free(cp->se_pids); 1984 for (i = 0; i < MAXARGV; i++) 1985 if (cp->se_argv[i]) 1986 free(cp->se_argv[i]); 1987 free_connlist(cp); 1988 #ifdef IPSEC 1989 if (cp->se_policy) 1990 free(cp->se_policy); 1991 #endif 1992 } 1993 1994 1995 /* 1996 * Safe skip - if skip returns null, log a syntax error in the 1997 * configuration file and exit. 1998 */ 1999 char * 2000 sskip(char **cpp) 2001 { 2002 char *cp; 2003 2004 cp = skip(cpp); 2005 if (cp == NULL) { 2006 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2007 exit(EX_DATAERR); 2008 } 2009 return (cp); 2010 } 2011 2012 char * 2013 skip(char **cpp) 2014 { 2015 char *cp = *cpp; 2016 char *start; 2017 char quote = '\0'; 2018 2019 again: 2020 while (*cp == ' ' || *cp == '\t') 2021 cp++; 2022 if (*cp == '\0') { 2023 int c; 2024 2025 c = getc(fconfig); 2026 (void) ungetc(c, fconfig); 2027 if (c == ' ' || c == '\t') 2028 if ((cp = nextline(fconfig))) 2029 goto again; 2030 *cpp = (char *)0; 2031 return ((char *)0); 2032 } 2033 if (*cp == '"' || *cp == '\'') 2034 quote = *cp++; 2035 start = cp; 2036 if (quote) 2037 while (*cp && *cp != quote) 2038 cp++; 2039 else 2040 while (*cp && *cp != ' ' && *cp != '\t') 2041 cp++; 2042 if (*cp != '\0') 2043 *cp++ = '\0'; 2044 *cpp = cp; 2045 return (start); 2046 } 2047 2048 char * 2049 nextline(FILE *fd) 2050 { 2051 char *cp; 2052 2053 if (fgets(line, sizeof (line), fd) == NULL) 2054 return ((char *)0); 2055 cp = strchr(line, '\n'); 2056 if (cp) 2057 *cp = '\0'; 2058 return (line); 2059 } 2060 2061 char * 2062 newstr(const char *cp) 2063 { 2064 char *cr; 2065 2066 if ((cr = strdup(cp != NULL ? cp : ""))) 2067 return (cr); 2068 syslog(LOG_ERR, "strdup: %m"); 2069 exit(EX_OSERR); 2070 } 2071 2072 void 2073 inetd_setproctitle(const char *a, int s) 2074 { 2075 socklen_t size; 2076 struct sockaddr_storage ss; 2077 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2078 2079 size = sizeof(ss); 2080 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2081 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2082 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); 2083 (void) sprintf(buf, "%s [%s]", a, pbuf); 2084 } else 2085 (void) sprintf(buf, "%s", a); 2086 setproctitle("%s", buf); 2087 } 2088 2089 int 2090 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2091 { 2092 struct servtab *se2; 2093 char pname[INET6_ADDRSTRLEN]; 2094 2095 for (se2 = servtab; se2; se2 = se2->se_next) { 2096 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2097 continue; 2098 2099 switch (se2->se_family) { 2100 case AF_INET: 2101 if (((const struct sockaddr_in *)sa)->sin_port == 2102 se2->se_ctrladdr4.sin_port) 2103 goto isloop; 2104 continue; 2105 #ifdef INET6 2106 case AF_INET6: 2107 if (((const struct sockaddr_in *)sa)->sin_port == 2108 se2->se_ctrladdr4.sin_port) 2109 goto isloop; 2110 continue; 2111 #endif 2112 default: 2113 continue; 2114 } 2115 isloop: 2116 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2117 NI_NUMERICHOST|NI_WITHSCOPEID); 2118 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2119 sep->se_service, sep->se_proto, 2120 se2->se_service, se2->se_proto, 2121 pname); 2122 return 1; 2123 } 2124 return 0; 2125 } 2126 2127 /* 2128 * print_service: 2129 * Dump relevant information to stderr 2130 */ 2131 void 2132 print_service(const char *action, const struct servtab *sep) 2133 { 2134 fprintf(stderr, 2135 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2136 #ifdef LOGIN_CAP 2137 "class=%s" 2138 #endif 2139 " builtin=%p server=%s" 2140 #ifdef IPSEC 2141 " policy=\"%s\"" 2142 #endif 2143 "\n", 2144 action, sep->se_service, sep->se_proto, 2145 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2146 #ifdef LOGIN_CAP 2147 sep->se_class, 2148 #endif 2149 (void *) sep->se_bi, sep->se_server 2150 #ifdef IPSEC 2151 , (sep->se_policy ? sep->se_policy : "") 2152 #endif 2153 ); 2154 } 2155 2156 #define CPMHSIZE 256 2157 #define CPMHMASK (CPMHSIZE-1) 2158 #define CHTGRAN 10 2159 #define CHTSIZE 6 2160 2161 typedef struct CTime { 2162 unsigned long ct_Ticks; 2163 int ct_Count; 2164 } CTime; 2165 2166 typedef struct CHash { 2167 union { 2168 struct in_addr c4_Addr; 2169 struct in6_addr c6_Addr; 2170 } cu_Addr; 2171 #define ch_Addr4 cu_Addr.c4_Addr 2172 #define ch_Addr6 cu_Addr.c6_Addr 2173 int ch_Family; 2174 time_t ch_LTime; 2175 char *ch_Service; 2176 CTime ch_Times[CHTSIZE]; 2177 } CHash; 2178 2179 CHash CHashAry[CPMHSIZE]; 2180 2181 int 2182 cpmip(const struct servtab *sep, int ctrl) 2183 { 2184 struct sockaddr_storage rss; 2185 socklen_t rssLen = sizeof(rss); 2186 int r = 0; 2187 2188 /* 2189 * If getpeername() fails, just let it through (if logging is 2190 * enabled the condition is caught elsewhere) 2191 */ 2192 2193 if (sep->se_maxcpm > 0 && 2194 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2195 time_t t = time(NULL); 2196 int hv = 0xABC3D20F; 2197 int i; 2198 int cnt = 0; 2199 CHash *chBest = NULL; 2200 unsigned int ticks = t / CHTGRAN; 2201 struct sockaddr_in *sin4; 2202 #ifdef INET6 2203 struct sockaddr_in6 *sin6; 2204 #endif 2205 2206 sin4 = (struct sockaddr_in *)&rss; 2207 #ifdef INET6 2208 sin6 = (struct sockaddr_in6 *)&rss; 2209 #endif 2210 { 2211 char *p; 2212 int addrlen; 2213 2214 switch (rss.ss_family) { 2215 case AF_INET: 2216 p = (char *)&sin4->sin_addr; 2217 addrlen = sizeof(struct in_addr); 2218 break; 2219 #ifdef INET6 2220 case AF_INET6: 2221 p = (char *)&sin6->sin6_addr; 2222 addrlen = sizeof(struct in6_addr); 2223 break; 2224 #endif 2225 default: 2226 /* should not happen */ 2227 return -1; 2228 } 2229 2230 for (i = 0; i < addrlen; ++i, ++p) { 2231 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2232 } 2233 hv = (hv ^ (hv >> 16)); 2234 } 2235 for (i = 0; i < 5; ++i) { 2236 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2237 2238 if (rss.ss_family == AF_INET && 2239 ch->ch_Family == AF_INET && 2240 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2241 ch->ch_Service && strcmp(sep->se_service, 2242 ch->ch_Service) == 0) { 2243 chBest = ch; 2244 break; 2245 } 2246 #ifdef INET6 2247 if (rss.ss_family == AF_INET6 && 2248 ch->ch_Family == AF_INET6 && 2249 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2250 &ch->ch_Addr6) != 0 && 2251 ch->ch_Service && strcmp(sep->se_service, 2252 ch->ch_Service) == 0) { 2253 chBest = ch; 2254 break; 2255 } 2256 #endif 2257 if (chBest == NULL || ch->ch_LTime == 0 || 2258 ch->ch_LTime < chBest->ch_LTime) { 2259 chBest = ch; 2260 } 2261 } 2262 if ((rss.ss_family == AF_INET && 2263 (chBest->ch_Family != AF_INET || 2264 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2265 chBest->ch_Service == NULL || 2266 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2267 chBest->ch_Family = sin4->sin_family; 2268 chBest->ch_Addr4 = sin4->sin_addr; 2269 if (chBest->ch_Service) 2270 free(chBest->ch_Service); 2271 chBest->ch_Service = strdup(sep->se_service); 2272 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2273 } 2274 #ifdef INET6 2275 if ((rss.ss_family == AF_INET6 && 2276 (chBest->ch_Family != AF_INET6 || 2277 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2278 &chBest->ch_Addr6) == 0)) || 2279 chBest->ch_Service == NULL || 2280 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2281 chBest->ch_Family = sin6->sin6_family; 2282 chBest->ch_Addr6 = sin6->sin6_addr; 2283 if (chBest->ch_Service) 2284 free(chBest->ch_Service); 2285 chBest->ch_Service = strdup(sep->se_service); 2286 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2287 } 2288 #endif 2289 chBest->ch_LTime = t; 2290 { 2291 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2292 if (ct->ct_Ticks != ticks) { 2293 ct->ct_Ticks = ticks; 2294 ct->ct_Count = 0; 2295 } 2296 ++ct->ct_Count; 2297 } 2298 for (i = 0; i < CHTSIZE; ++i) { 2299 CTime *ct = &chBest->ch_Times[i]; 2300 if (ct->ct_Ticks <= ticks && 2301 ct->ct_Ticks >= ticks - CHTSIZE) { 2302 cnt += ct->ct_Count; 2303 } 2304 } 2305 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) { 2306 char pname[INET6_ADDRSTRLEN]; 2307 2308 getnameinfo((struct sockaddr *)&rss, 2309 ((struct sockaddr *)&rss)->sa_len, 2310 pname, sizeof(pname), NULL, 0, 2311 NI_NUMERICHOST|NI_WITHSCOPEID); 2312 r = -1; 2313 syslog(LOG_ERR, 2314 "%s from %s exceeded counts/min (limit %d/min)", 2315 sep->se_service, pname, 2316 sep->se_maxcpm); 2317 } 2318 } 2319 return(r); 2320 } 2321 2322 static struct conninfo * 2323 search_conn(struct servtab *sep, int ctrl) 2324 { 2325 struct sockaddr_storage ss; 2326 socklen_t sslen = sizeof(ss); 2327 struct conninfo *conn; 2328 int hv; 2329 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2330 2331 if (sep->se_maxperip <= 0) 2332 return NULL; 2333 2334 /* 2335 * If getpeername() fails, just let it through (if logging is 2336 * enabled the condition is caught elsewhere) 2337 */ 2338 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2339 return NULL; 2340 2341 switch (ss.ss_family) { 2342 case AF_INET: 2343 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2344 sizeof(struct in_addr)); 2345 break; 2346 #ifdef INET6 2347 case AF_INET6: 2348 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2349 sizeof(struct in6_addr)); 2350 break; 2351 #endif 2352 default: 2353 /* 2354 * Since we only support AF_INET and AF_INET6, just 2355 * let other than AF_INET and AF_INET6 through. 2356 */ 2357 return NULL; 2358 } 2359 2360 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2361 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 2362 return NULL; 2363 2364 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2365 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2366 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2367 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 && 2368 strcmp(pname, pname2) == 0) 2369 break; 2370 } 2371 2372 if (conn == NULL) { 2373 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2374 syslog(LOG_ERR, "malloc: %m"); 2375 exit(EX_OSERR); 2376 } 2377 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2378 if (conn->co_proc == NULL) { 2379 syslog(LOG_ERR, "malloc: %m"); 2380 exit(EX_OSERR); 2381 } 2382 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2383 conn->co_numchild = 0; 2384 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2385 } 2386 2387 /* 2388 * Since a child process is not invoked yet, we cannot 2389 * determine a pid of a child. So, co_proc and co_numchild 2390 * should be filled leter. 2391 */ 2392 2393 return conn; 2394 } 2395 2396 static int 2397 room_conn(struct servtab *sep, struct conninfo *conn) 2398 { 2399 char pname[NI_MAXHOST]; 2400 2401 if (conn->co_numchild >= sep->se_maxperip) { 2402 getnameinfo((struct sockaddr *)&conn->co_addr, 2403 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2404 NI_NUMERICHOST | NI_WITHSCOPEID); 2405 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2406 sep->se_service, pname, sep->se_maxperip); 2407 return 0; 2408 } 2409 return 1; 2410 } 2411 2412 static void 2413 addchild_conn(struct conninfo *conn, pid_t pid) 2414 { 2415 struct procinfo *proc; 2416 2417 if (conn == NULL) 2418 return; 2419 2420 if ((proc = search_proc(pid, 1)) != NULL) { 2421 if (proc->pr_conn != NULL) { 2422 syslog(LOG_ERR, 2423 "addchild_conn: child already on process list"); 2424 exit(EX_OSERR); 2425 } 2426 proc->pr_conn = conn; 2427 } 2428 2429 conn->co_proc[conn->co_numchild++] = proc; 2430 } 2431 2432 static void 2433 reapchild_conn(pid_t pid) 2434 { 2435 struct procinfo *proc; 2436 struct conninfo *conn; 2437 int i; 2438 2439 if ((proc = search_proc(pid, 0)) == NULL) 2440 return; 2441 if ((conn = proc->pr_conn) == NULL) 2442 return; 2443 for (i = 0; i < conn->co_numchild; ++i) 2444 if (conn->co_proc[i] == proc) { 2445 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2446 break; 2447 } 2448 free_proc(proc); 2449 free_conn(conn); 2450 } 2451 2452 static void 2453 resize_conn(struct servtab *sep, int maxpip) 2454 { 2455 struct conninfo *conn; 2456 int i, j; 2457 2458 if (sep->se_maxperip <= 0) 2459 return; 2460 if (maxpip <= 0) { 2461 free_connlist(sep); 2462 return; 2463 } 2464 for (i = 0; i < PERIPSIZE; ++i) { 2465 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2466 for (j = maxpip; j < conn->co_numchild; ++j) 2467 free_proc(conn->co_proc[j]); 2468 conn->co_proc = realloc(conn->co_proc, 2469 maxpip * sizeof(*conn->co_proc)); 2470 if (conn->co_proc == NULL) { 2471 syslog(LOG_ERR, "realloc: %m"); 2472 exit(EX_OSERR); 2473 } 2474 if (conn->co_numchild > maxpip) 2475 conn->co_numchild = maxpip; 2476 } 2477 } 2478 } 2479 2480 static void 2481 free_connlist(struct servtab *sep) 2482 { 2483 struct conninfo *conn; 2484 int i, j; 2485 2486 for (i = 0; i < PERIPSIZE; ++i) { 2487 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2488 for (j = 0; j < conn->co_numchild; ++j) 2489 free_proc(conn->co_proc[j]); 2490 conn->co_numchild = 0; 2491 free_conn(conn); 2492 } 2493 } 2494 } 2495 2496 static void 2497 free_conn(struct conninfo *conn) 2498 { 2499 if (conn == NULL) 2500 return; 2501 if (conn->co_numchild <= 0) { 2502 LIST_REMOVE(conn, co_link); 2503 free(conn->co_proc); 2504 free(conn); 2505 } 2506 } 2507 2508 static struct procinfo * 2509 search_proc(pid_t pid, int add) 2510 { 2511 struct procinfo *proc; 2512 int hv; 2513 2514 hv = hashval((char *)&pid, sizeof(pid)); 2515 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2516 if (proc->pr_pid == pid) 2517 break; 2518 } 2519 if (proc == NULL && add) { 2520 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2521 syslog(LOG_ERR, "malloc: %m"); 2522 exit(EX_OSERR); 2523 } 2524 proc->pr_pid = pid; 2525 proc->pr_conn = NULL; 2526 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2527 } 2528 return proc; 2529 } 2530 2531 static void 2532 free_proc(struct procinfo *proc) 2533 { 2534 if (proc == NULL) 2535 return; 2536 LIST_REMOVE(proc, pr_link); 2537 free(proc); 2538 } 2539 2540 static int 2541 hashval(char *p, int len) 2542 { 2543 int i, hv = 0xABC3D20F; 2544 2545 for (i = 0; i < len; ++i, ++p) 2546 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2547 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2548 return hv; 2549 } 2550