inetd.c revision 288048
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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#ifndef lint 31static const char copyright[] = 32"@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34#endif /* not lint */ 35 36#ifndef lint 37#if 0 38static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; 39#endif 40#endif /* not lint */ 41 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: stable/10/usr.sbin/inetd/inetd.c 288048 2015-09-20 22:27:19Z hrs $"); 44 45/* 46 * Inetd - Internet super-server 47 * 48 * This program invokes all internet services as needed. Connection-oriented 49 * services are invoked each time a connection is made, by creating a process. 50 * This process is passed the connection as file descriptor 0 and is expected 51 * to do a getpeername to find out the source host and port. 52 * 53 * Datagram oriented services are invoked when a datagram 54 * arrives; a process is created and passed a pending message 55 * on file descriptor 0. Datagram servers may either connect 56 * to their peer, freeing up the original socket for inetd 57 * to receive further messages on, or ``take over the socket'', 58 * processing all arriving datagrams and, eventually, timing 59 * out. The first type of server is said to be ``multi-threaded''; 60 * the second type of server ``single-threaded''. 61 * 62 * Inetd uses a configuration file which is read at startup 63 * and, possibly, at some later time in response to a hangup signal. 64 * The configuration file is ``free format'' with fields given in the 65 * order shown below. Continuation lines for an entry must begin with 66 * a space or tab. All fields must be present in each entry. 67 * 68 * service name must be in /etc/services 69 * or name a tcpmux service 70 * or specify a unix domain socket 71 * socket type stream/dgram/raw/rdm/seqpacket 72 * protocol tcp[4][6][/faith], udp[4][6], unix 73 * wait/nowait single-threaded/multi-threaded 74 * user[:group][/login-class] user/group/login-class to run daemon as 75 * server program full path name 76 * server program arguments maximum of MAXARGS (20) 77 * 78 * TCP services without official port numbers are handled with the 79 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 80 * requests. When a connection is made from a foreign host, the service 81 * requested is passed to tcpmux, which looks it up in the servtab list 82 * and returns the proper entry for the service. Tcpmux returns a 83 * negative reply if the service doesn't exist, otherwise the invoked 84 * server is expected to return the positive reply if the service type in 85 * inetd.conf file has the prefix "tcpmux/". If the service type has the 86 * prefix "tcpmux/+", tcpmux will return the positive reply for the 87 * process; this is for compatibility with older server code, and also 88 * allows you to invoke programs that use stdin/stdout without putting any 89 * special server code in them. Services that use tcpmux are "nowait" 90 * because they do not have a well-known port and hence cannot listen 91 * for new requests. 92 * 93 * For RPC services 94 * service name/version must be in /etc/rpc 95 * socket type stream/dgram/raw/rdm/seqpacket 96 * protocol rpc/tcp[4][6], rpc/udp[4][6] 97 * wait/nowait single-threaded/multi-threaded 98 * user[:group][/login-class] user/group/login-class to run daemon as 99 * server program full path name 100 * server program arguments maximum of MAXARGS 101 * 102 * Comment lines are indicated by a `#' in column 1. 103 * 104 * #ifdef IPSEC 105 * Comment lines that start with "#@" denote IPsec policy string, as described 106 * in ipsec_set_policy(3). This will affect all the following items in 107 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 108 * there's no IPsec policy. 109 * #endif 110 */ 111#include <sys/param.h> 112#include <sys/ioctl.h> 113#include <sys/mman.h> 114#include <sys/wait.h> 115#include <sys/time.h> 116#include <sys/resource.h> 117#include <sys/stat.h> 118#include <sys/un.h> 119 120#include <netinet/in.h> 121#include <netinet/tcp.h> 122#include <arpa/inet.h> 123#include <rpc/rpc.h> 124#include <rpc/pmap_clnt.h> 125 126#include <ctype.h> 127#include <errno.h> 128#include <err.h> 129#include <fcntl.h> 130#include <grp.h> 131#include <libutil.h> 132#include <limits.h> 133#include <netdb.h> 134#include <pwd.h> 135#include <signal.h> 136#include <stdio.h> 137#include <stdlib.h> 138#include <string.h> 139#include <sysexits.h> 140#include <syslog.h> 141#include <tcpd.h> 142#include <unistd.h> 143 144#include "inetd.h" 145#include "pathnames.h" 146 147#ifdef IPSEC 148#include <netipsec/ipsec.h> 149#ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 150#undef IPSEC 151#endif 152#endif 153 154#ifndef LIBWRAP_ALLOW_FACILITY 155# define LIBWRAP_ALLOW_FACILITY LOG_AUTH 156#endif 157#ifndef LIBWRAP_ALLOW_SEVERITY 158# define LIBWRAP_ALLOW_SEVERITY LOG_INFO 159#endif 160#ifndef LIBWRAP_DENY_FACILITY 161# define LIBWRAP_DENY_FACILITY LOG_AUTH 162#endif 163#ifndef LIBWRAP_DENY_SEVERITY 164# define LIBWRAP_DENY_SEVERITY LOG_WARNING 165#endif 166 167#define ISWRAP(sep) \ 168 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 169 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 170 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 171 || (sep)->se_socktype == SOCK_DGRAM)) 172 173#ifdef LOGIN_CAP 174#include <login_cap.h> 175 176/* see init.c */ 177#define RESOURCE_RC "daemon" 178 179#endif 180 181#ifndef MAXCHILD 182#define MAXCHILD -1 /* maximum number of this service 183 < 0 = no limit */ 184#endif 185 186#ifndef MAXCPM 187#define MAXCPM -1 /* rate limit invocations from a 188 single remote address, 189 < 0 = no limit */ 190#endif 191 192#ifndef MAXPERIP 193#define MAXPERIP -1 /* maximum number of this service 194 from a single remote address, 195 < 0 = no limit */ 196#endif 197 198#ifndef TOOMANY 199#define TOOMANY 256 /* don't start more than TOOMANY */ 200#endif 201#define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 202#define RETRYTIME (60*10) /* retry after bind or server fail */ 203#define MAX_MAXCHLD 32767 /* max allowable max children */ 204 205#define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 206 207void close_sep(struct servtab *); 208void flag_signal(int); 209void flag_config(int); 210void config(void); 211int cpmip(const struct servtab *, int); 212void endconfig(void); 213struct servtab *enter(struct servtab *); 214void freeconfig(struct servtab *); 215struct servtab *getconfigent(void); 216int matchservent(const char *, const char *, const char *); 217char *nextline(FILE *); 218void addchild(struct servtab *, int); 219void flag_reapchild(int); 220void reapchild(void); 221void enable(struct servtab *); 222void disable(struct servtab *); 223void flag_retry(int); 224void retry(void); 225int setconfig(void); 226void setup(struct servtab *); 227#ifdef IPSEC 228void ipsecsetup(struct servtab *); 229#endif 230void unregisterrpc(register struct servtab *sep); 231static struct conninfo *search_conn(struct servtab *sep, int ctrl); 232static int room_conn(struct servtab *sep, struct conninfo *conn); 233static void addchild_conn(struct conninfo *conn, pid_t pid); 234static void reapchild_conn(pid_t pid); 235static void free_conn(struct conninfo *conn); 236static void resize_conn(struct servtab *sep, int maxperip); 237static void free_connlist(struct servtab *sep); 238static void free_proc(struct procinfo *); 239static struct procinfo *search_proc(pid_t pid, int add); 240static int hashval(char *p, int len); 241 242int allow_severity; 243int deny_severity; 244int wrap_ex = 0; 245int wrap_bi = 0; 246int debug = 0; 247int dolog = 0; 248int maxsock; /* highest-numbered descriptor */ 249fd_set allsock; 250int options; 251int timingout; 252int toomany = TOOMANY; 253int maxchild = MAXCHILD; 254int maxcpm = MAXCPM; 255int maxperip = MAXPERIP; 256struct servent *sp; 257struct rpcent *rpc; 258char *hostname = NULL; 259struct sockaddr_in *bind_sa4; 260int v4bind_ok = 0; 261#ifdef INET6 262struct sockaddr_in6 *bind_sa6; 263int v6bind_ok = 0; 264#endif 265int signalpipe[2]; 266#ifdef SANITY_CHECK 267int nsock; 268#endif 269uid_t euid; 270gid_t egid; 271mode_t mask; 272 273struct servtab *servtab; 274 275extern struct biltin biltins[]; 276 277const char *CONFIG = _PATH_INETDCONF; 278const char *pid_file = _PATH_INETDPID; 279struct pidfh *pfh = NULL; 280 281struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 282 283static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 284 285int 286getvalue(const char *arg, int *value, const char *whine) 287{ 288 int tmp; 289 char *p; 290 291 tmp = strtol(arg, &p, 0); 292 if (tmp < 0 || *p) { 293 syslog(LOG_ERR, whine, arg); 294 return 1; /* failure */ 295 } 296 *value = tmp; 297 return 0; /* success */ 298} 299 300static sa_family_t 301whichaf(struct request_info *req) 302{ 303 struct sockaddr *sa; 304 305 sa = (struct sockaddr *)req->client->sin; 306 if (sa == NULL) 307 return AF_UNSPEC; 308 if (sa->sa_family == AF_INET6 && 309 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr)) 310 return AF_INET; 311 return sa->sa_family; 312} 313 314int 315main(int argc, char **argv) 316{ 317 struct servtab *sep; 318 struct passwd *pwd; 319 struct group *grp; 320 struct sigaction sa, saalrm, sachld, sahup, sapipe; 321 int ch, dofork; 322 pid_t pid; 323 char buf[50]; 324#ifdef LOGIN_CAP 325 login_cap_t *lc = NULL; 326#endif 327 struct request_info req; 328 int denied; 329 char *service = NULL; 330 struct sockaddr_storage peer; 331 int i; 332 struct addrinfo hints, *res; 333 const char *servname; 334 int error; 335 struct conninfo *conn; 336 337 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 338 339 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 340 switch(ch) { 341 case 'd': 342 debug = 1; 343 options |= SO_DEBUG; 344 break; 345 case 'l': 346 dolog = 1; 347 break; 348 case 'R': 349 getvalue(optarg, &toomany, 350 "-R %s: bad value for service invocation rate"); 351 break; 352 case 'c': 353 getvalue(optarg, &maxchild, 354 "-c %s: bad value for maximum children"); 355 break; 356 case 'C': 357 getvalue(optarg, &maxcpm, 358 "-C %s: bad value for maximum children/minute"); 359 break; 360 case 'a': 361 hostname = optarg; 362 break; 363 case 'p': 364 pid_file = optarg; 365 break; 366 case 's': 367 getvalue(optarg, &maxperip, 368 "-s %s: bad value for maximum children per source address"); 369 break; 370 case 'w': 371 wrap_ex++; 372 break; 373 case 'W': 374 wrap_bi++; 375 break; 376 case '?': 377 default: 378 syslog(LOG_ERR, 379 "usage: inetd [-dlwW] [-a address] [-R rate]" 380 " [-c maximum] [-C rate]" 381 " [-p pidfile] [conf-file]"); 382 exit(EX_USAGE); 383 } 384 /* 385 * Initialize Bind Addrs. 386 * When hostname is NULL, wild card bind addrs are obtained from 387 * getaddrinfo(). But getaddrinfo() requires at least one of 388 * hostname or servname is non NULL. 389 * So when hostname is NULL, set dummy value to servname. 390 * Since getaddrinfo() doesn't accept numeric servname, and 391 * we doesn't use ai_socktype of struct addrinfo returned 392 * from getaddrinfo(), we set dummy value to ai_socktype. 393 */ 394 servname = (hostname == NULL) ? "0" /* dummy */ : NULL; 395 396 bzero(&hints, sizeof(struct addrinfo)); 397 hints.ai_flags = AI_PASSIVE; 398 hints.ai_family = AF_UNSPEC; 399 hints.ai_socktype = SOCK_STREAM; /* dummy */ 400 error = getaddrinfo(hostname, servname, &hints, &res); 401 if (error != 0) { 402 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 403 if (error == EAI_SYSTEM) 404 syslog(LOG_ERR, "%s", strerror(errno)); 405 exit(EX_USAGE); 406 } 407 do { 408 if (res->ai_addr == NULL) { 409 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 410 exit(EX_USAGE); 411 } 412 switch (res->ai_addr->sa_family) { 413 case AF_INET: 414 if (v4bind_ok) 415 continue; 416 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 417 /* init port num in case servname is dummy */ 418 bind_sa4->sin_port = 0; 419 v4bind_ok = 1; 420 continue; 421#ifdef INET6 422 case AF_INET6: 423 if (v6bind_ok) 424 continue; 425 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 426 /* init port num in case servname is dummy */ 427 bind_sa6->sin6_port = 0; 428 v6bind_ok = 1; 429 continue; 430#endif 431 } 432 if (v4bind_ok 433#ifdef INET6 434 && v6bind_ok 435#endif 436 ) 437 break; 438 } while ((res = res->ai_next) != NULL); 439 if (!v4bind_ok 440#ifdef INET6 441 && !v6bind_ok 442#endif 443 ) { 444 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 445 exit(EX_USAGE); 446 } 447 448 euid = geteuid(); 449 egid = getegid(); 450 umask(mask = umask(0777)); 451 452 argc -= optind; 453 argv += optind; 454 455 if (argc > 0) 456 CONFIG = argv[0]; 457 if (access(CONFIG, R_OK) < 0) 458 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG); 459 if (debug == 0) { 460 pid_t otherpid; 461 462 pfh = pidfile_open(pid_file, 0600, &otherpid); 463 if (pfh == NULL) { 464 if (errno == EEXIST) { 465 syslog(LOG_ERR, "%s already running, pid: %d", 466 getprogname(), otherpid); 467 exit(EX_OSERR); 468 } 469 syslog(LOG_WARNING, "pidfile_open() failed: %m"); 470 } 471 472 if (daemon(0, 0) < 0) { 473 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 474 } 475 /* From now on we don't want syslog messages going to stderr. */ 476 closelog(); 477 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 478 /* 479 * In case somebody has started inetd manually, we need to 480 * clear the logname, so that old servers run as root do not 481 * get the user's logname.. 482 */ 483 if (setlogin("") < 0) { 484 syslog(LOG_WARNING, "cannot clear logname: %m"); 485 /* no big deal if it fails.. */ 486 } 487 if (pfh != NULL && pidfile_write(pfh) == -1) { 488 syslog(LOG_WARNING, "pidfile_write(): %m"); 489 } 490 } 491 492 if (madvise(NULL, 0, MADV_PROTECT) != 0) 493 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno)); 494 495 for (i = 0; i < PERIPSIZE; ++i) 496 LIST_INIT(&proctable[i]); 497 498 if (v4bind_ok) { 499 udpconf = getnetconfigent("udp"); 500 tcpconf = getnetconfigent("tcp"); 501 if (udpconf == NULL || tcpconf == NULL) { 502 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 503 exit(EX_USAGE); 504 } 505 } 506#ifdef INET6 507 if (v6bind_ok) { 508 udp6conf = getnetconfigent("udp6"); 509 tcp6conf = getnetconfigent("tcp6"); 510 if (udp6conf == NULL || tcp6conf == NULL) { 511 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 512 exit(EX_USAGE); 513 } 514 } 515#endif 516 517 sa.sa_flags = 0; 518 sigemptyset(&sa.sa_mask); 519 sigaddset(&sa.sa_mask, SIGALRM); 520 sigaddset(&sa.sa_mask, SIGCHLD); 521 sigaddset(&sa.sa_mask, SIGHUP); 522 sa.sa_handler = flag_retry; 523 sigaction(SIGALRM, &sa, &saalrm); 524 config(); 525 sa.sa_handler = flag_config; 526 sigaction(SIGHUP, &sa, &sahup); 527 sa.sa_handler = flag_reapchild; 528 sigaction(SIGCHLD, &sa, &sachld); 529 sa.sa_handler = SIG_IGN; 530 sigaction(SIGPIPE, &sa, &sapipe); 531 532 { 533 /* space for daemons to overwrite environment for ps */ 534#define DUMMYSIZE 100 535 char dummy[DUMMYSIZE]; 536 537 (void)memset(dummy, 'x', DUMMYSIZE - 1); 538 dummy[DUMMYSIZE - 1] = '\0'; 539 (void)setenv("inetd_dummy", dummy, 1); 540 } 541 542 if (pipe(signalpipe) != 0) { 543 syslog(LOG_ERR, "pipe: %m"); 544 exit(EX_OSERR); 545 } 546 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 || 547 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) { 548 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m"); 549 exit(EX_OSERR); 550 } 551 FD_SET(signalpipe[0], &allsock); 552#ifdef SANITY_CHECK 553 nsock++; 554#endif 555 if (signalpipe[0] > maxsock) 556 maxsock = signalpipe[0]; 557 if (signalpipe[1] > maxsock) 558 maxsock = signalpipe[1]; 559 560 for (;;) { 561 int n, ctrl; 562 fd_set readable; 563 564#ifdef SANITY_CHECK 565 if (nsock == 0) { 566 syslog(LOG_ERR, "%s: nsock=0", __func__); 567 exit(EX_SOFTWARE); 568 } 569#endif 570 readable = allsock; 571 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 572 (fd_set *)0, (struct timeval *)0)) <= 0) { 573 if (n < 0 && errno != EINTR) { 574 syslog(LOG_WARNING, "select: %m"); 575 sleep(1); 576 } 577 continue; 578 } 579 /* handle any queued signal flags */ 580 if (FD_ISSET(signalpipe[0], &readable)) { 581 int nsig; 582 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 583 syslog(LOG_ERR, "ioctl: %m"); 584 exit(EX_OSERR); 585 } 586 while (--nsig >= 0) { 587 char c; 588 if (read(signalpipe[0], &c, 1) != 1) { 589 syslog(LOG_ERR, "read: %m"); 590 exit(EX_OSERR); 591 } 592 if (debug) 593 warnx("handling signal flag %c", c); 594 switch(c) { 595 case 'A': /* sigalrm */ 596 retry(); 597 break; 598 case 'C': /* sigchld */ 599 reapchild(); 600 break; 601 case 'H': /* sighup */ 602 config(); 603 break; 604 } 605 } 606 } 607 for (sep = servtab; n && sep; sep = sep->se_next) 608 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 609 n--; 610 if (debug) 611 warnx("someone wants %s", sep->se_service); 612 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 613 conn = NULL; 614 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 615 i = 1; 616 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 617 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 618 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 619 (socklen_t *)0); 620 if (debug) 621 warnx("accept, ctrl %d", ctrl); 622 if (ctrl < 0) { 623 if (errno != EINTR) 624 syslog(LOG_WARNING, 625 "accept (for %s): %m", 626 sep->se_service); 627 if (sep->se_accept && 628 sep->se_socktype == SOCK_STREAM) 629 close(ctrl); 630 continue; 631 } 632 i = 0; 633 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 634 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 635 if (ioctl(ctrl, FIONBIO, &i) < 0) 636 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 637 if (cpmip(sep, ctrl) < 0) { 638 close(ctrl); 639 continue; 640 } 641 if (dofork && 642 (conn = search_conn(sep, ctrl)) != NULL && 643 !room_conn(sep, conn)) { 644 close(ctrl); 645 continue; 646 } 647 } else 648 ctrl = sep->se_fd; 649 if (dolog && !ISWRAP(sep)) { 650 char pname[NI_MAXHOST] = "unknown"; 651 socklen_t sl; 652 sl = sizeof(peer); 653 if (getpeername(ctrl, (struct sockaddr *) 654 &peer, &sl)) { 655 sl = sizeof(peer); 656 if (recvfrom(ctrl, buf, sizeof(buf), 657 MSG_PEEK, 658 (struct sockaddr *)&peer, 659 &sl) >= 0) { 660 getnameinfo((struct sockaddr *)&peer, 661 peer.ss_len, 662 pname, sizeof(pname), 663 NULL, 0, NI_NUMERICHOST); 664 } 665 } else { 666 getnameinfo((struct sockaddr *)&peer, 667 peer.ss_len, 668 pname, sizeof(pname), 669 NULL, 0, NI_NUMERICHOST); 670 } 671 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 672 } 673 (void) sigblock(SIGBLOCK); 674 pid = 0; 675 /* 676 * Fork for all external services, builtins which need to 677 * fork and anything we're wrapping (as wrapping might 678 * block or use hosts_options(5) twist). 679 */ 680 if (dofork) { 681 if (sep->se_count++ == 0) 682 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time); 683 else if (toomany > 0 && sep->se_count >= toomany) { 684 struct timespec now; 685 686 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now); 687 if (now.tv_sec - sep->se_time.tv_sec > 688 CNT_INTVL) { 689 sep->se_time = now; 690 sep->se_count = 1; 691 } else { 692 syslog(LOG_ERR, 693 "%s/%s server failing (looping), service terminated", 694 sep->se_service, sep->se_proto); 695 if (sep->se_accept && 696 sep->se_socktype == SOCK_STREAM) 697 close(ctrl); 698 close_sep(sep); 699 free_conn(conn); 700 sigsetmask(0L); 701 if (!timingout) { 702 timingout = 1; 703 alarm(RETRYTIME); 704 } 705 continue; 706 } 707 } 708 pid = fork(); 709 } 710 if (pid < 0) { 711 syslog(LOG_ERR, "fork: %m"); 712 if (sep->se_accept && 713 sep->se_socktype == SOCK_STREAM) 714 close(ctrl); 715 free_conn(conn); 716 sigsetmask(0L); 717 sleep(1); 718 continue; 719 } 720 if (pid) { 721 addchild_conn(conn, pid); 722 addchild(sep, pid); 723 } 724 sigsetmask(0L); 725 if (pid == 0) { 726 pidfile_close(pfh); 727 if (dofork) { 728 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 729 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 730 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 731 /* SIGPIPE reset before exec */ 732 } 733 /* 734 * Call tcpmux to find the real service to exec. 735 */ 736 if (sep->se_bi && 737 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 738 sep = tcpmux(ctrl); 739 if (sep == NULL) { 740 close(ctrl); 741 _exit(0); 742 } 743 } 744 if (ISWRAP(sep)) { 745 inetd_setproctitle("wrapping", ctrl); 746 service = sep->se_server_name ? 747 sep->se_server_name : sep->se_service; 748 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0); 749 fromhost(&req); 750 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 751 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 752 denied = !hosts_access(&req); 753 if (denied) { 754 syslog(deny_severity, 755 "refused connection from %.500s, service %s (%s%s)", 756 eval_client(&req), service, sep->se_proto, 757 (whichaf(&req) == AF_INET6) ? "6" : ""); 758 if (sep->se_socktype != SOCK_STREAM) 759 recv(ctrl, buf, sizeof (buf), 0); 760 if (dofork) { 761 sleep(1); 762 _exit(0); 763 } 764 } 765 if (dolog) { 766 syslog(allow_severity, 767 "connection from %.500s, service %s (%s%s)", 768 eval_client(&req), service, sep->se_proto, 769 (whichaf(&req) == AF_INET6) ? "6" : ""); 770 } 771 } 772 if (sep->se_bi) { 773 (*sep->se_bi->bi_fn)(ctrl, sep); 774 } else { 775 if (debug) 776 warnx("%d execl %s", 777 getpid(), sep->se_server); 778 /* Clear close-on-exec. */ 779 if (fcntl(ctrl, F_SETFD, 0) < 0) { 780 syslog(LOG_ERR, 781 "%s/%s: fcntl (F_SETFD, 0): %m", 782 sep->se_service, sep->se_proto); 783 _exit(EX_OSERR); 784 } 785 if (ctrl != 0) { 786 dup2(ctrl, 0); 787 close(ctrl); 788 } 789 dup2(0, 1); 790 dup2(0, 2); 791 if ((pwd = getpwnam(sep->se_user)) == NULL) { 792 syslog(LOG_ERR, 793 "%s/%s: %s: no such user", 794 sep->se_service, sep->se_proto, 795 sep->se_user); 796 if (sep->se_socktype != SOCK_STREAM) 797 recv(0, buf, sizeof (buf), 0); 798 _exit(EX_NOUSER); 799 } 800 grp = NULL; 801 if ( sep->se_group != NULL 802 && (grp = getgrnam(sep->se_group)) == NULL 803 ) { 804 syslog(LOG_ERR, 805 "%s/%s: %s: no such group", 806 sep->se_service, sep->se_proto, 807 sep->se_group); 808 if (sep->se_socktype != SOCK_STREAM) 809 recv(0, buf, sizeof (buf), 0); 810 _exit(EX_NOUSER); 811 } 812 if (grp != NULL) 813 pwd->pw_gid = grp->gr_gid; 814#ifdef LOGIN_CAP 815 if ((lc = login_getclass(sep->se_class)) == NULL) { 816 /* error syslogged by getclass */ 817 syslog(LOG_ERR, 818 "%s/%s: %s: login class error", 819 sep->se_service, sep->se_proto, 820 sep->se_class); 821 if (sep->se_socktype != SOCK_STREAM) 822 recv(0, buf, sizeof (buf), 0); 823 _exit(EX_NOUSER); 824 } 825#endif 826 if (setsid() < 0) { 827 syslog(LOG_ERR, 828 "%s: can't setsid(): %m", 829 sep->se_service); 830 /* _exit(EX_OSERR); not fatal yet */ 831 } 832#ifdef LOGIN_CAP 833 if (setusercontext(lc, pwd, pwd->pw_uid, 834 LOGIN_SETALL & ~LOGIN_SETMAC) 835 != 0) { 836 syslog(LOG_ERR, 837 "%s: can't setusercontext(..%s..): %m", 838 sep->se_service, sep->se_user); 839 _exit(EX_OSERR); 840 } 841 login_close(lc); 842#else 843 if (pwd->pw_uid) { 844 if (setlogin(sep->se_user) < 0) { 845 syslog(LOG_ERR, 846 "%s: can't setlogin(%s): %m", 847 sep->se_service, sep->se_user); 848 /* _exit(EX_OSERR); not yet */ 849 } 850 if (setgid(pwd->pw_gid) < 0) { 851 syslog(LOG_ERR, 852 "%s: can't set gid %d: %m", 853 sep->se_service, pwd->pw_gid); 854 _exit(EX_OSERR); 855 } 856 (void) initgroups(pwd->pw_name, 857 pwd->pw_gid); 858 if (setuid(pwd->pw_uid) < 0) { 859 syslog(LOG_ERR, 860 "%s: can't set uid %d: %m", 861 sep->se_service, pwd->pw_uid); 862 _exit(EX_OSERR); 863 } 864 } 865#endif 866 sigaction(SIGPIPE, &sapipe, 867 (struct sigaction *)0); 868 execv(sep->se_server, sep->se_argv); 869 syslog(LOG_ERR, 870 "cannot execute %s: %m", sep->se_server); 871 if (sep->se_socktype != SOCK_STREAM) 872 recv(0, buf, sizeof (buf), 0); 873 } 874 if (dofork) 875 _exit(0); 876 } 877 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 878 close(ctrl); 879 } 880 } 881} 882 883/* 884 * Add a signal flag to the signal flag queue for later handling 885 */ 886 887void 888flag_signal(int c) 889{ 890 char ch = c; 891 892 if (write(signalpipe[1], &ch, 1) != 1) { 893 syslog(LOG_ERR, "write: %m"); 894 _exit(EX_OSERR); 895 } 896} 897 898/* 899 * Record a new child pid for this service. If we've reached the 900 * limit on children, then stop accepting incoming requests. 901 */ 902 903void 904addchild(struct servtab *sep, pid_t pid) 905{ 906 if (sep->se_maxchild <= 0) 907 return; 908#ifdef SANITY_CHECK 909 if (sep->se_numchild >= sep->se_maxchild) { 910 syslog(LOG_ERR, "%s: %d >= %d", 911 __func__, sep->se_numchild, sep->se_maxchild); 912 exit(EX_SOFTWARE); 913 } 914#endif 915 sep->se_pids[sep->se_numchild++] = pid; 916 if (sep->se_numchild == sep->se_maxchild) 917 disable(sep); 918} 919 920/* 921 * Some child process has exited. See if it's on somebody's list. 922 */ 923 924void 925flag_reapchild(int signo __unused) 926{ 927 flag_signal('C'); 928} 929 930void 931reapchild(void) 932{ 933 int k, status; 934 pid_t pid; 935 struct servtab *sep; 936 937 for (;;) { 938 pid = wait3(&status, WNOHANG, (struct rusage *)0); 939 if (pid <= 0) 940 break; 941 if (debug) 942 warnx("%d reaped, %s %u", pid, 943 WIFEXITED(status) ? "status" : "signal", 944 WIFEXITED(status) ? WEXITSTATUS(status) 945 : WTERMSIG(status)); 946 for (sep = servtab; sep; sep = sep->se_next) { 947 for (k = 0; k < sep->se_numchild; k++) 948 if (sep->se_pids[k] == pid) 949 break; 950 if (k == sep->se_numchild) 951 continue; 952 if (sep->se_numchild == sep->se_maxchild) 953 enable(sep); 954 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 955 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 956 syslog(LOG_WARNING, 957 "%s[%d]: exited, %s %u", 958 sep->se_server, pid, 959 WIFEXITED(status) ? "status" : "signal", 960 WIFEXITED(status) ? WEXITSTATUS(status) 961 : WTERMSIG(status)); 962 break; 963 } 964 reapchild_conn(pid); 965 } 966} 967 968void 969flag_config(int signo __unused) 970{ 971 flag_signal('H'); 972} 973 974void 975config(void) 976{ 977 struct servtab *sep, *new, **sepp; 978 long omask; 979 int new_nomapped; 980#ifdef LOGIN_CAP 981 login_cap_t *lc = NULL; 982#endif 983 984 if (!setconfig()) { 985 syslog(LOG_ERR, "%s: %m", CONFIG); 986 return; 987 } 988 for (sep = servtab; sep; sep = sep->se_next) 989 sep->se_checked = 0; 990 while ((new = getconfigent())) { 991 if (getpwnam(new->se_user) == NULL) { 992 syslog(LOG_ERR, 993 "%s/%s: no such user '%s', service ignored", 994 new->se_service, new->se_proto, new->se_user); 995 continue; 996 } 997 if (new->se_group && getgrnam(new->se_group) == NULL) { 998 syslog(LOG_ERR, 999 "%s/%s: no such group '%s', service ignored", 1000 new->se_service, new->se_proto, new->se_group); 1001 continue; 1002 } 1003#ifdef LOGIN_CAP 1004 if ((lc = login_getclass(new->se_class)) == NULL) { 1005 /* error syslogged by getclass */ 1006 syslog(LOG_ERR, 1007 "%s/%s: %s: login class error, service ignored", 1008 new->se_service, new->se_proto, new->se_class); 1009 continue; 1010 } 1011 login_close(lc); 1012#endif 1013 new_nomapped = new->se_nomapped; 1014 for (sep = servtab; sep; sep = sep->se_next) 1015 if (strcmp(sep->se_service, new->se_service) == 0 && 1016 strcmp(sep->se_proto, new->se_proto) == 0 && 1017 sep->se_rpc == new->se_rpc && 1018 sep->se_socktype == new->se_socktype && 1019 sep->se_family == new->se_family) 1020 break; 1021 if (sep != 0) { 1022 int i; 1023 1024#define SWAP(t,a, b) { t c = a; a = b; b = c; } 1025 omask = sigblock(SIGBLOCK); 1026 if (sep->se_nomapped != new->se_nomapped) { 1027 /* for rpc keep old nommaped till unregister */ 1028 if (!sep->se_rpc) 1029 sep->se_nomapped = new->se_nomapped; 1030 sep->se_reset = 1; 1031 } 1032 /* copy over outstanding child pids */ 1033 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1034 new->se_numchild = sep->se_numchild; 1035 if (new->se_numchild > new->se_maxchild) 1036 new->se_numchild = new->se_maxchild; 1037 memcpy(new->se_pids, sep->se_pids, 1038 new->se_numchild * sizeof(*new->se_pids)); 1039 } 1040 SWAP(pid_t *, sep->se_pids, new->se_pids); 1041 sep->se_maxchild = new->se_maxchild; 1042 sep->se_numchild = new->se_numchild; 1043 sep->se_maxcpm = new->se_maxcpm; 1044 resize_conn(sep, new->se_maxperip); 1045 sep->se_maxperip = new->se_maxperip; 1046 sep->se_bi = new->se_bi; 1047 /* might need to turn on or off service now */ 1048 if (sep->se_fd >= 0) { 1049 if (sep->se_maxchild > 0 1050 && sep->se_numchild == sep->se_maxchild) { 1051 if (FD_ISSET(sep->se_fd, &allsock)) 1052 disable(sep); 1053 } else { 1054 if (!FD_ISSET(sep->se_fd, &allsock)) 1055 enable(sep); 1056 } 1057 } 1058 sep->se_accept = new->se_accept; 1059 SWAP(char *, sep->se_user, new->se_user); 1060 SWAP(char *, sep->se_group, new->se_group); 1061#ifdef LOGIN_CAP 1062 SWAP(char *, sep->se_class, new->se_class); 1063#endif 1064 SWAP(char *, sep->se_server, new->se_server); 1065 SWAP(char *, sep->se_server_name, new->se_server_name); 1066 for (i = 0; i < MAXARGV; i++) 1067 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1068#ifdef IPSEC 1069 SWAP(char *, sep->se_policy, new->se_policy); 1070 ipsecsetup(sep); 1071#endif 1072 sigsetmask(omask); 1073 freeconfig(new); 1074 if (debug) 1075 print_service("REDO", sep); 1076 } else { 1077 sep = enter(new); 1078 if (debug) 1079 print_service("ADD ", sep); 1080 } 1081 sep->se_checked = 1; 1082 if (ISMUX(sep)) { 1083 sep->se_fd = -1; 1084 continue; 1085 } 1086 switch (sep->se_family) { 1087 case AF_INET: 1088 if (!v4bind_ok) { 1089 sep->se_fd = -1; 1090 continue; 1091 } 1092 break; 1093#ifdef INET6 1094 case AF_INET6: 1095 if (!v6bind_ok) { 1096 sep->se_fd = -1; 1097 continue; 1098 } 1099 break; 1100#endif 1101 } 1102 if (!sep->se_rpc) { 1103 if (sep->se_family != AF_UNIX) { 1104 sp = getservbyname(sep->se_service, sep->se_proto); 1105 if (sp == 0) { 1106 syslog(LOG_ERR, "%s/%s: unknown service", 1107 sep->se_service, sep->se_proto); 1108 sep->se_checked = 0; 1109 continue; 1110 } 1111 } 1112 switch (sep->se_family) { 1113 case AF_INET: 1114 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1115 sep->se_ctrladdr4.sin_port = 1116 sp->s_port; 1117 sep->se_reset = 1; 1118 } 1119 break; 1120#ifdef INET6 1121 case AF_INET6: 1122 if (sp->s_port != 1123 sep->se_ctrladdr6.sin6_port) { 1124 sep->se_ctrladdr6.sin6_port = 1125 sp->s_port; 1126 sep->se_reset = 1; 1127 } 1128 break; 1129#endif 1130 } 1131 if (sep->se_reset != 0 && sep->se_fd >= 0) 1132 close_sep(sep); 1133 } else { 1134 rpc = getrpcbyname(sep->se_service); 1135 if (rpc == 0) { 1136 syslog(LOG_ERR, "%s/%s unknown RPC service", 1137 sep->se_service, sep->se_proto); 1138 if (sep->se_fd != -1) 1139 (void) close(sep->se_fd); 1140 sep->se_fd = -1; 1141 continue; 1142 } 1143 if (sep->se_reset != 0 || 1144 rpc->r_number != sep->se_rpc_prog) { 1145 if (sep->se_rpc_prog) 1146 unregisterrpc(sep); 1147 sep->se_rpc_prog = rpc->r_number; 1148 if (sep->se_fd != -1) 1149 (void) close(sep->se_fd); 1150 sep->se_fd = -1; 1151 } 1152 sep->se_nomapped = new_nomapped; 1153 } 1154 sep->se_reset = 0; 1155 if (sep->se_fd == -1) 1156 setup(sep); 1157 } 1158 endconfig(); 1159 /* 1160 * Purge anything not looked at above. 1161 */ 1162 omask = sigblock(SIGBLOCK); 1163 sepp = &servtab; 1164 while ((sep = *sepp)) { 1165 if (sep->se_checked) { 1166 sepp = &sep->se_next; 1167 continue; 1168 } 1169 *sepp = sep->se_next; 1170 if (sep->se_fd >= 0) 1171 close_sep(sep); 1172 if (debug) 1173 print_service("FREE", sep); 1174 if (sep->se_rpc && sep->se_rpc_prog > 0) 1175 unregisterrpc(sep); 1176 freeconfig(sep); 1177 free(sep); 1178 } 1179 (void) sigsetmask(omask); 1180} 1181 1182void 1183unregisterrpc(struct servtab *sep) 1184{ 1185 u_int i; 1186 struct servtab *sepp; 1187 long omask; 1188 struct netconfig *netid4, *netid6; 1189 1190 omask = sigblock(SIGBLOCK); 1191 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1192 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1193 if (sep->se_family == AF_INET) 1194 netid6 = NULL; 1195 else if (sep->se_nomapped) 1196 netid4 = NULL; 1197 /* 1198 * Conflict if same prog and protocol - In that case one should look 1199 * to versions, but it is not interesting: having separate servers for 1200 * different versions does not work well. 1201 * Therefore one do not unregister if there is a conflict. 1202 * There is also transport conflict if destroying INET when INET46 1203 * exists, or destroying INET46 when INET exists 1204 */ 1205 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1206 if (sepp == sep) 1207 continue; 1208 if (sepp->se_checked == 0 || 1209 !sepp->se_rpc || 1210 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1211 sep->se_rpc_prog != sepp->se_rpc_prog) 1212 continue; 1213 if (sepp->se_family == AF_INET) 1214 netid4 = NULL; 1215 if (sepp->se_family == AF_INET6) { 1216 netid6 = NULL; 1217 if (!sep->se_nomapped) 1218 netid4 = NULL; 1219 } 1220 if (netid4 == NULL && netid6 == NULL) 1221 return; 1222 } 1223 if (debug) 1224 print_service("UNREG", sep); 1225 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1226 if (netid4) 1227 rpcb_unset(sep->se_rpc_prog, i, netid4); 1228 if (netid6) 1229 rpcb_unset(sep->se_rpc_prog, i, netid6); 1230 } 1231 if (sep->se_fd != -1) 1232 (void) close(sep->se_fd); 1233 sep->se_fd = -1; 1234 (void) sigsetmask(omask); 1235} 1236 1237void 1238flag_retry(int signo __unused) 1239{ 1240 flag_signal('A'); 1241} 1242 1243void 1244retry(void) 1245{ 1246 struct servtab *sep; 1247 1248 timingout = 0; 1249 for (sep = servtab; sep; sep = sep->se_next) 1250 if (sep->se_fd == -1 && !ISMUX(sep)) 1251 setup(sep); 1252} 1253 1254void 1255setup(struct servtab *sep) 1256{ 1257 int on = 1; 1258 1259 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1260 if (debug) 1261 warn("socket failed on %s/%s", 1262 sep->se_service, sep->se_proto); 1263 syslog(LOG_ERR, "%s/%s: socket: %m", 1264 sep->se_service, sep->se_proto); 1265 return; 1266 } 1267 /* Set all listening sockets to close-on-exec. */ 1268 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1269 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m", 1270 sep->se_service, sep->se_proto); 1271 close(sep->se_fd); 1272 return; 1273 } 1274#define turnon(fd, opt) \ 1275setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1276 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1277 turnon(sep->se_fd, SO_DEBUG) < 0) 1278 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1279 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1280 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1281#ifdef SO_PRIVSTATE 1282 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1283 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1284#endif 1285 /* tftpd opens a new connection then needs more infos */ 1286 if ((sep->se_family == AF_INET6) && 1287 (strcmp(sep->se_proto, "udp") == 0) && 1288 (sep->se_accept == 0) && 1289 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1290 (char *)&on, sizeof (on)) < 0)) 1291 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1292 if (sep->se_family == AF_INET6) { 1293 int flag = sep->se_nomapped ? 1 : 0; 1294 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1295 (char *)&flag, sizeof (flag)) < 0) 1296 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1297 } 1298#undef turnon 1299#ifdef IPV6_FAITH 1300 if (sep->se_type == FAITH_TYPE) { 1301 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1302 sizeof(on)) < 0) { 1303 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1304 } 1305 } 1306#endif 1307#ifdef IPSEC 1308 ipsecsetup(sep); 1309#endif 1310 if (sep->se_family == AF_UNIX) { 1311 (void) unlink(sep->se_ctrladdr_un.sun_path); 1312 umask(0777); /* Make socket with conservative permissions */ 1313 } 1314 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1315 sep->se_ctrladdr_size) < 0) { 1316 if (debug) 1317 warn("bind failed on %s/%s", 1318 sep->se_service, sep->se_proto); 1319 syslog(LOG_ERR, "%s/%s: bind: %m", 1320 sep->se_service, sep->se_proto); 1321 (void) close(sep->se_fd); 1322 sep->se_fd = -1; 1323 if (!timingout) { 1324 timingout = 1; 1325 alarm(RETRYTIME); 1326 } 1327 if (sep->se_family == AF_UNIX) 1328 umask(mask); 1329 return; 1330 } 1331 if (sep->se_family == AF_UNIX) { 1332 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1333 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1334 syslog(LOG_ERR, "chown socket: %m"); 1335 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1336 syslog(LOG_ERR, "chmod socket: %m"); 1337 umask(mask); 1338 } 1339 if (sep->se_rpc) { 1340 u_int i; 1341 socklen_t len = sep->se_ctrladdr_size; 1342 struct netconfig *netid, *netid2 = NULL; 1343 struct sockaddr_in sock; 1344 struct netbuf nbuf, nbuf2; 1345 1346 if (getsockname(sep->se_fd, 1347 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1348 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1349 sep->se_service, sep->se_proto); 1350 (void) close(sep->se_fd); 1351 sep->se_fd = -1; 1352 return; 1353 } 1354 nbuf.buf = &sep->se_ctrladdr; 1355 nbuf.len = sep->se_ctrladdr.sa_len; 1356 if (sep->se_family == AF_INET) 1357 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1358 else { 1359 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1360 if (!sep->se_nomapped) { /* INET and INET6 */ 1361 netid2 = netid==udp6conf? udpconf:tcpconf; 1362 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1363 nbuf2.buf = &sock; 1364 nbuf2.len = sock.sin_len = sizeof sock; 1365 sock.sin_family = AF_INET; 1366 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1367 } 1368 } 1369 if (debug) 1370 print_service("REG ", sep); 1371 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1372 rpcb_unset(sep->se_rpc_prog, i, netid); 1373 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1374 if (netid2) { 1375 rpcb_unset(sep->se_rpc_prog, i, netid2); 1376 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1377 } 1378 } 1379 } 1380 if (sep->se_socktype == SOCK_STREAM) 1381 listen(sep->se_fd, -1); 1382 enable(sep); 1383 if (debug) { 1384 warnx("registered %s on %d", 1385 sep->se_server, sep->se_fd); 1386 } 1387} 1388 1389#ifdef IPSEC 1390void 1391ipsecsetup(struct servtab *sep) 1392{ 1393 char *buf; 1394 char *policy_in = NULL; 1395 char *policy_out = NULL; 1396 int level; 1397 int opt; 1398 1399 switch (sep->se_family) { 1400 case AF_INET: 1401 level = IPPROTO_IP; 1402 opt = IP_IPSEC_POLICY; 1403 break; 1404#ifdef INET6 1405 case AF_INET6: 1406 level = IPPROTO_IPV6; 1407 opt = IPV6_IPSEC_POLICY; 1408 break; 1409#endif 1410 default: 1411 return; 1412 } 1413 1414 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1415 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1416 policy_in = def_in; 1417 policy_out = def_out; 1418 } else { 1419 if (!strncmp("in", sep->se_policy, 2)) 1420 policy_in = sep->se_policy; 1421 else if (!strncmp("out", sep->se_policy, 3)) 1422 policy_out = sep->se_policy; 1423 else { 1424 syslog(LOG_ERR, "invalid security policy \"%s\"", 1425 sep->se_policy); 1426 return; 1427 } 1428 } 1429 1430 if (policy_in != NULL) { 1431 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1432 if (buf != NULL) { 1433 if (setsockopt(sep->se_fd, level, opt, 1434 buf, ipsec_get_policylen(buf)) < 0 && 1435 debug != 0) 1436 warnx("%s/%s: ipsec initialization failed; %s", 1437 sep->se_service, sep->se_proto, 1438 policy_in); 1439 free(buf); 1440 } else 1441 syslog(LOG_ERR, "invalid security policy \"%s\"", 1442 policy_in); 1443 } 1444 if (policy_out != NULL) { 1445 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1446 if (buf != NULL) { 1447 if (setsockopt(sep->se_fd, level, opt, 1448 buf, ipsec_get_policylen(buf)) < 0 && 1449 debug != 0) 1450 warnx("%s/%s: ipsec initialization failed; %s", 1451 sep->se_service, sep->se_proto, 1452 policy_out); 1453 free(buf); 1454 } else 1455 syslog(LOG_ERR, "invalid security policy \"%s\"", 1456 policy_out); 1457 } 1458} 1459#endif 1460 1461/* 1462 * Finish with a service and its socket. 1463 */ 1464void 1465close_sep(struct servtab *sep) 1466{ 1467 if (sep->se_fd >= 0) { 1468 if (FD_ISSET(sep->se_fd, &allsock)) 1469 disable(sep); 1470 (void) close(sep->se_fd); 1471 sep->se_fd = -1; 1472 } 1473 sep->se_count = 0; 1474 sep->se_numchild = 0; /* forget about any existing children */ 1475} 1476 1477int 1478matchservent(const char *name1, const char *name2, const char *proto) 1479{ 1480 char **alias, *p; 1481 struct servent *se; 1482 1483 if (strcmp(proto, "unix") == 0) { 1484 if ((p = strrchr(name1, '/')) != NULL) 1485 name1 = p + 1; 1486 if ((p = strrchr(name2, '/')) != NULL) 1487 name2 = p + 1; 1488 } 1489 if (strcmp(name1, name2) == 0) 1490 return(1); 1491 if ((se = getservbyname(name1, proto)) != NULL) { 1492 if (strcmp(name2, se->s_name) == 0) 1493 return(1); 1494 for (alias = se->s_aliases; *alias; alias++) 1495 if (strcmp(name2, *alias) == 0) 1496 return(1); 1497 } 1498 return(0); 1499} 1500 1501struct servtab * 1502enter(struct servtab *cp) 1503{ 1504 struct servtab *sep; 1505 long omask; 1506 1507 sep = (struct servtab *)malloc(sizeof (*sep)); 1508 if (sep == (struct servtab *)0) { 1509 syslog(LOG_ERR, "malloc: %m"); 1510 exit(EX_OSERR); 1511 } 1512 *sep = *cp; 1513 sep->se_fd = -1; 1514 omask = sigblock(SIGBLOCK); 1515 sep->se_next = servtab; 1516 servtab = sep; 1517 sigsetmask(omask); 1518 return (sep); 1519} 1520 1521void 1522enable(struct servtab *sep) 1523{ 1524 if (debug) 1525 warnx( 1526 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1527#ifdef SANITY_CHECK 1528 if (sep->se_fd < 0) { 1529 syslog(LOG_ERR, 1530 "%s: %s: bad fd", __func__, sep->se_service); 1531 exit(EX_SOFTWARE); 1532 } 1533 if (ISMUX(sep)) { 1534 syslog(LOG_ERR, 1535 "%s: %s: is mux", __func__, sep->se_service); 1536 exit(EX_SOFTWARE); 1537 } 1538 if (FD_ISSET(sep->se_fd, &allsock)) { 1539 syslog(LOG_ERR, 1540 "%s: %s: not off", __func__, sep->se_service); 1541 exit(EX_SOFTWARE); 1542 } 1543 nsock++; 1544#endif 1545 FD_SET(sep->se_fd, &allsock); 1546 if (sep->se_fd > maxsock) 1547 maxsock = sep->se_fd; 1548} 1549 1550void 1551disable(struct servtab *sep) 1552{ 1553 if (debug) 1554 warnx( 1555 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1556#ifdef SANITY_CHECK 1557 if (sep->se_fd < 0) { 1558 syslog(LOG_ERR, 1559 "%s: %s: bad fd", __func__, sep->se_service); 1560 exit(EX_SOFTWARE); 1561 } 1562 if (ISMUX(sep)) { 1563 syslog(LOG_ERR, 1564 "%s: %s: is mux", __func__, sep->se_service); 1565 exit(EX_SOFTWARE); 1566 } 1567 if (!FD_ISSET(sep->se_fd, &allsock)) { 1568 syslog(LOG_ERR, 1569 "%s: %s: not on", __func__, sep->se_service); 1570 exit(EX_SOFTWARE); 1571 } 1572 if (nsock == 0) { 1573 syslog(LOG_ERR, "%s: nsock=0", __func__); 1574 exit(EX_SOFTWARE); 1575 } 1576 nsock--; 1577#endif 1578 FD_CLR(sep->se_fd, &allsock); 1579 if (sep->se_fd == maxsock) 1580 maxsock--; 1581} 1582 1583FILE *fconfig = NULL; 1584struct servtab serv; 1585char line[LINE_MAX]; 1586 1587int 1588setconfig(void) 1589{ 1590 1591 if (fconfig != NULL) { 1592 fseek(fconfig, 0L, SEEK_SET); 1593 return (1); 1594 } 1595 fconfig = fopen(CONFIG, "r"); 1596 return (fconfig != NULL); 1597} 1598 1599void 1600endconfig(void) 1601{ 1602 if (fconfig) { 1603 (void) fclose(fconfig); 1604 fconfig = NULL; 1605 } 1606} 1607 1608struct servtab * 1609getconfigent(void) 1610{ 1611 struct servtab *sep = &serv; 1612 int argc; 1613 char *cp, *arg, *s; 1614 char *versp; 1615 static char TCPMUX_TOKEN[] = "tcpmux/"; 1616#define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1617#ifdef IPSEC 1618 char *policy; 1619#endif 1620 int v4bind; 1621#ifdef INET6 1622 int v6bind; 1623#endif 1624 int i; 1625 1626#ifdef IPSEC 1627 policy = NULL; 1628#endif 1629more: 1630 v4bind = 0; 1631#ifdef INET6 1632 v6bind = 0; 1633#endif 1634 while ((cp = nextline(fconfig)) != NULL) { 1635#ifdef IPSEC 1636 /* lines starting with #@ is not a comment, but the policy */ 1637 if (cp[0] == '#' && cp[1] == '@') { 1638 char *p; 1639 for (p = cp + 2; p && *p && isspace(*p); p++) 1640 ; 1641 if (*p == '\0') { 1642 if (policy) 1643 free(policy); 1644 policy = NULL; 1645 } else if (ipsec_get_policylen(p) >= 0) { 1646 if (policy) 1647 free(policy); 1648 policy = newstr(p); 1649 } else { 1650 syslog(LOG_ERR, 1651 "%s: invalid ipsec policy \"%s\"", 1652 CONFIG, p); 1653 exit(EX_CONFIG); 1654 } 1655 } 1656#endif 1657 if (*cp == '#' || *cp == '\0') 1658 continue; 1659 break; 1660 } 1661 if (cp == NULL) 1662 return ((struct servtab *)0); 1663 /* 1664 * clear the static buffer, since some fields (se_ctrladdr, 1665 * for example) don't get initialized here. 1666 */ 1667 memset(sep, 0, sizeof *sep); 1668 arg = skip(&cp); 1669 if (cp == NULL) { 1670 /* got an empty line containing just blanks/tabs. */ 1671 goto more; 1672 } 1673 if (arg[0] == ':') { /* :user:group:perm: */ 1674 char *user, *group, *perm; 1675 struct passwd *pw; 1676 struct group *gr; 1677 user = arg+1; 1678 if ((group = strchr(user, ':')) == NULL) { 1679 syslog(LOG_ERR, "no group after user '%s'", user); 1680 goto more; 1681 } 1682 *group++ = '\0'; 1683 if ((perm = strchr(group, ':')) == NULL) { 1684 syslog(LOG_ERR, "no mode after group '%s'", group); 1685 goto more; 1686 } 1687 *perm++ = '\0'; 1688 if ((pw = getpwnam(user)) == NULL) { 1689 syslog(LOG_ERR, "no such user '%s'", user); 1690 goto more; 1691 } 1692 sep->se_sockuid = pw->pw_uid; 1693 if ((gr = getgrnam(group)) == NULL) { 1694 syslog(LOG_ERR, "no such user '%s'", group); 1695 goto more; 1696 } 1697 sep->se_sockgid = gr->gr_gid; 1698 sep->se_sockmode = strtol(perm, &arg, 8); 1699 if (*arg != ':') { 1700 syslog(LOG_ERR, "bad mode '%s'", perm); 1701 goto more; 1702 } 1703 *arg++ = '\0'; 1704 } else { 1705 sep->se_sockuid = euid; 1706 sep->se_sockgid = egid; 1707 sep->se_sockmode = 0200; 1708 } 1709 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1710 char *c = arg + MUX_LEN; 1711 if (*c == '+') { 1712 sep->se_type = MUXPLUS_TYPE; 1713 c++; 1714 } else 1715 sep->se_type = MUX_TYPE; 1716 sep->se_service = newstr(c); 1717 } else { 1718 sep->se_service = newstr(arg); 1719 sep->se_type = NORM_TYPE; 1720 } 1721 arg = sskip(&cp); 1722 if (strcmp(arg, "stream") == 0) 1723 sep->se_socktype = SOCK_STREAM; 1724 else if (strcmp(arg, "dgram") == 0) 1725 sep->se_socktype = SOCK_DGRAM; 1726 else if (strcmp(arg, "rdm") == 0) 1727 sep->se_socktype = SOCK_RDM; 1728 else if (strcmp(arg, "seqpacket") == 0) 1729 sep->se_socktype = SOCK_SEQPACKET; 1730 else if (strcmp(arg, "raw") == 0) 1731 sep->se_socktype = SOCK_RAW; 1732 else 1733 sep->se_socktype = -1; 1734 1735 arg = sskip(&cp); 1736 if (strncmp(arg, "tcp", 3) == 0) { 1737 sep->se_proto = newstr(strsep(&arg, "/")); 1738 if (arg != NULL) { 1739 if (strcmp(arg, "faith") == 0) 1740 sep->se_type = FAITH_TYPE; 1741 } 1742 } else { 1743 if (sep->se_type == NORM_TYPE && 1744 strncmp(arg, "faith/", 6) == 0) { 1745 arg += 6; 1746 sep->se_type = FAITH_TYPE; 1747 } 1748 sep->se_proto = newstr(arg); 1749 } 1750 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1751 memmove(sep->se_proto, sep->se_proto + 4, 1752 strlen(sep->se_proto) + 1 - 4); 1753 sep->se_rpc = 1; 1754 sep->se_rpc_prog = sep->se_rpc_lowvers = 1755 sep->se_rpc_highvers = 0; 1756 if ((versp = strrchr(sep->se_service, '/'))) { 1757 *versp++ = '\0'; 1758 switch (sscanf(versp, "%u-%u", 1759 &sep->se_rpc_lowvers, 1760 &sep->se_rpc_highvers)) { 1761 case 2: 1762 break; 1763 case 1: 1764 sep->se_rpc_highvers = 1765 sep->se_rpc_lowvers; 1766 break; 1767 default: 1768 syslog(LOG_ERR, 1769 "bad RPC version specifier; %s", 1770 sep->se_service); 1771 freeconfig(sep); 1772 goto more; 1773 } 1774 } 1775 else { 1776 sep->se_rpc_lowvers = 1777 sep->se_rpc_highvers = 1; 1778 } 1779 } 1780 sep->se_nomapped = 0; 1781 if (strcmp(sep->se_proto, "unix") == 0) { 1782 sep->se_family = AF_UNIX; 1783 } else { 1784 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1785#ifdef INET6 1786 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1787 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1788 v6bind = 1; 1789 continue; 1790 } 1791#endif 1792 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1793 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1794 v4bind = 1; 1795 continue; 1796 } 1797 /* illegal version num */ 1798 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1799 freeconfig(sep); 1800 goto more; 1801 } 1802#ifdef INET6 1803 if (v6bind && !v6bind_ok) { 1804 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1805 sep->se_service); 1806 if (v4bind && v4bind_ok) 1807 v6bind = 0; 1808 else { 1809 freeconfig(sep); 1810 goto more; 1811 } 1812 } 1813 if (v6bind) { 1814 sep->se_family = AF_INET6; 1815 if (!v4bind || !v4bind_ok) 1816 sep->se_nomapped = 1; 1817 } else 1818#endif 1819 { /* default to v4 bind if not v6 bind */ 1820 if (!v4bind_ok) { 1821 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1822 sep->se_service); 1823 freeconfig(sep); 1824 goto more; 1825 } 1826 sep->se_family = AF_INET; 1827 } 1828 } 1829 /* init ctladdr */ 1830 switch(sep->se_family) { 1831 case AF_INET: 1832 memcpy(&sep->se_ctrladdr4, bind_sa4, 1833 sizeof(sep->se_ctrladdr4)); 1834 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1835 break; 1836#ifdef INET6 1837 case AF_INET6: 1838 memcpy(&sep->se_ctrladdr6, bind_sa6, 1839 sizeof(sep->se_ctrladdr6)); 1840 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1841 break; 1842#endif 1843 case AF_UNIX: 1844 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1845 syslog(LOG_ERR, 1846 "domain socket pathname too long for service %s", 1847 sep->se_service); 1848 goto more; 1849 } 1850 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1851 sep->se_ctrladdr_un.sun_family = sep->se_family; 1852 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1853 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1854 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1855 } 1856 arg = sskip(&cp); 1857 if (!strncmp(arg, "wait", 4)) 1858 sep->se_accept = 0; 1859 else if (!strncmp(arg, "nowait", 6)) 1860 sep->se_accept = 1; 1861 else { 1862 syslog(LOG_ERR, 1863 "%s: bad wait/nowait for service %s", 1864 CONFIG, sep->se_service); 1865 goto more; 1866 } 1867 sep->se_maxchild = -1; 1868 sep->se_maxcpm = -1; 1869 sep->se_maxperip = -1; 1870 if ((s = strchr(arg, '/')) != NULL) { 1871 char *eptr; 1872 u_long val; 1873 1874 val = strtoul(s + 1, &eptr, 10); 1875 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1876 syslog(LOG_ERR, 1877 "%s: bad max-child for service %s", 1878 CONFIG, sep->se_service); 1879 goto more; 1880 } 1881 if (debug) 1882 if (!sep->se_accept && val != 1) 1883 warnx("maxchild=%lu for wait service %s" 1884 " not recommended", val, sep->se_service); 1885 sep->se_maxchild = val; 1886 if (*eptr == '/') 1887 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1888 if (*eptr == '/') 1889 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1890 /* 1891 * explicitly do not check for \0 for future expansion / 1892 * backwards compatibility 1893 */ 1894 } 1895 if (ISMUX(sep)) { 1896 /* 1897 * Silently enforce "nowait" mode for TCPMUX services 1898 * since they don't have an assigned port to listen on. 1899 */ 1900 sep->se_accept = 1; 1901 if (strcmp(sep->se_proto, "tcp")) { 1902 syslog(LOG_ERR, 1903 "%s: bad protocol for tcpmux service %s", 1904 CONFIG, sep->se_service); 1905 goto more; 1906 } 1907 if (sep->se_socktype != SOCK_STREAM) { 1908 syslog(LOG_ERR, 1909 "%s: bad socket type for tcpmux service %s", 1910 CONFIG, sep->se_service); 1911 goto more; 1912 } 1913 } 1914 sep->se_user = newstr(sskip(&cp)); 1915#ifdef LOGIN_CAP 1916 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1917 *s = '\0'; 1918 sep->se_class = newstr(s + 1); 1919 } else 1920 sep->se_class = newstr(RESOURCE_RC); 1921#endif 1922 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1923 *s = '\0'; 1924 sep->se_group = newstr(s + 1); 1925 } else 1926 sep->se_group = NULL; 1927 sep->se_server = newstr(sskip(&cp)); 1928 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1929 sep->se_server_name++; 1930 if (strcmp(sep->se_server, "internal") == 0) { 1931 struct biltin *bi; 1932 1933 for (bi = biltins; bi->bi_service; bi++) 1934 if (bi->bi_socktype == sep->se_socktype && 1935 matchservent(bi->bi_service, sep->se_service, 1936 sep->se_proto)) 1937 break; 1938 if (bi->bi_service == 0) { 1939 syslog(LOG_ERR, "internal service %s unknown", 1940 sep->se_service); 1941 goto more; 1942 } 1943 sep->se_accept = 1; /* force accept mode for built-ins */ 1944 sep->se_bi = bi; 1945 } else 1946 sep->se_bi = NULL; 1947 if (sep->se_maxperip < 0) 1948 sep->se_maxperip = maxperip; 1949 if (sep->se_maxcpm < 0) 1950 sep->se_maxcpm = maxcpm; 1951 if (sep->se_maxchild < 0) { /* apply default max-children */ 1952 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1953 sep->se_maxchild = sep->se_bi->bi_maxchild; 1954 else if (sep->se_accept) 1955 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1956 else 1957 sep->se_maxchild = 1; 1958 } 1959 if (sep->se_maxchild > 0) { 1960 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1961 if (sep->se_pids == NULL) { 1962 syslog(LOG_ERR, "malloc: %m"); 1963 exit(EX_OSERR); 1964 } 1965 } 1966 argc = 0; 1967 for (arg = skip(&cp); cp; arg = skip(&cp)) 1968 if (argc < MAXARGV) { 1969 sep->se_argv[argc++] = newstr(arg); 1970 } else { 1971 syslog(LOG_ERR, 1972 "%s: too many arguments for service %s", 1973 CONFIG, sep->se_service); 1974 goto more; 1975 } 1976 while (argc <= MAXARGV) 1977 sep->se_argv[argc++] = NULL; 1978 for (i = 0; i < PERIPSIZE; ++i) 1979 LIST_INIT(&sep->se_conn[i]); 1980#ifdef IPSEC 1981 sep->se_policy = policy ? newstr(policy) : NULL; 1982#endif 1983 return (sep); 1984} 1985 1986void 1987freeconfig(struct servtab *cp) 1988{ 1989 int i; 1990 1991 if (cp->se_service) 1992 free(cp->se_service); 1993 if (cp->se_proto) 1994 free(cp->se_proto); 1995 if (cp->se_user) 1996 free(cp->se_user); 1997 if (cp->se_group) 1998 free(cp->se_group); 1999#ifdef LOGIN_CAP 2000 if (cp->se_class) 2001 free(cp->se_class); 2002#endif 2003 if (cp->se_server) 2004 free(cp->se_server); 2005 if (cp->se_pids) 2006 free(cp->se_pids); 2007 for (i = 0; i < MAXARGV; i++) 2008 if (cp->se_argv[i]) 2009 free(cp->se_argv[i]); 2010 free_connlist(cp); 2011#ifdef IPSEC 2012 if (cp->se_policy) 2013 free(cp->se_policy); 2014#endif 2015} 2016 2017 2018/* 2019 * Safe skip - if skip returns null, log a syntax error in the 2020 * configuration file and exit. 2021 */ 2022char * 2023sskip(char **cpp) 2024{ 2025 char *cp; 2026 2027 cp = skip(cpp); 2028 if (cp == NULL) { 2029 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2030 exit(EX_DATAERR); 2031 } 2032 return (cp); 2033} 2034 2035char * 2036skip(char **cpp) 2037{ 2038 char *cp = *cpp; 2039 char *start; 2040 char quote = '\0'; 2041 2042again: 2043 while (*cp == ' ' || *cp == '\t') 2044 cp++; 2045 if (*cp == '\0') { 2046 int c; 2047 2048 c = getc(fconfig); 2049 (void) ungetc(c, fconfig); 2050 if (c == ' ' || c == '\t') 2051 if ((cp = nextline(fconfig))) 2052 goto again; 2053 *cpp = (char *)0; 2054 return ((char *)0); 2055 } 2056 if (*cp == '"' || *cp == '\'') 2057 quote = *cp++; 2058 start = cp; 2059 if (quote) 2060 while (*cp && *cp != quote) 2061 cp++; 2062 else 2063 while (*cp && *cp != ' ' && *cp != '\t') 2064 cp++; 2065 if (*cp != '\0') 2066 *cp++ = '\0'; 2067 *cpp = cp; 2068 return (start); 2069} 2070 2071char * 2072nextline(FILE *fd) 2073{ 2074 char *cp; 2075 2076 if (fgets(line, sizeof (line), fd) == NULL) 2077 return ((char *)0); 2078 cp = strchr(line, '\n'); 2079 if (cp) 2080 *cp = '\0'; 2081 return (line); 2082} 2083 2084char * 2085newstr(const char *cp) 2086{ 2087 char *cr; 2088 2089 if ((cr = strdup(cp != NULL ? cp : ""))) 2090 return (cr); 2091 syslog(LOG_ERR, "strdup: %m"); 2092 exit(EX_OSERR); 2093} 2094 2095void 2096inetd_setproctitle(const char *a, int s) 2097{ 2098 socklen_t size; 2099 struct sockaddr_storage ss; 2100 char buf[80], pbuf[NI_MAXHOST]; 2101 2102 size = sizeof(ss); 2103 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2104 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2105 NULL, 0, NI_NUMERICHOST); 2106 (void) sprintf(buf, "%s [%s]", a, pbuf); 2107 } else 2108 (void) sprintf(buf, "%s", a); 2109 setproctitle("%s", buf); 2110} 2111 2112int 2113check_loop(const struct sockaddr *sa, const struct servtab *sep) 2114{ 2115 struct servtab *se2; 2116 char pname[NI_MAXHOST]; 2117 2118 for (se2 = servtab; se2; se2 = se2->se_next) { 2119 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2120 continue; 2121 2122 switch (se2->se_family) { 2123 case AF_INET: 2124 if (((const struct sockaddr_in *)sa)->sin_port == 2125 se2->se_ctrladdr4.sin_port) 2126 goto isloop; 2127 continue; 2128#ifdef INET6 2129 case AF_INET6: 2130 if (((const struct sockaddr_in6 *)sa)->sin6_port == 2131 se2->se_ctrladdr6.sin6_port) 2132 goto isloop; 2133 continue; 2134#endif 2135 default: 2136 continue; 2137 } 2138 isloop: 2139 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2140 NI_NUMERICHOST); 2141 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2142 sep->se_service, sep->se_proto, 2143 se2->se_service, se2->se_proto, 2144 pname); 2145 return 1; 2146 } 2147 return 0; 2148} 2149 2150/* 2151 * print_service: 2152 * Dump relevant information to stderr 2153 */ 2154void 2155print_service(const char *action, const struct servtab *sep) 2156{ 2157 fprintf(stderr, 2158 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2159#ifdef LOGIN_CAP 2160 "class=%s" 2161#endif 2162 " builtin=%p server=%s" 2163#ifdef IPSEC 2164 " policy=\"%s\"" 2165#endif 2166 "\n", 2167 action, sep->se_service, sep->se_proto, 2168 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2169#ifdef LOGIN_CAP 2170 sep->se_class, 2171#endif 2172 (void *) sep->se_bi, sep->se_server 2173#ifdef IPSEC 2174 , (sep->se_policy ? sep->se_policy : "") 2175#endif 2176 ); 2177} 2178 2179#define CPMHSIZE 256 2180#define CPMHMASK (CPMHSIZE-1) 2181#define CHTGRAN 10 2182#define CHTSIZE 6 2183 2184typedef struct CTime { 2185 unsigned long ct_Ticks; 2186 int ct_Count; 2187} CTime; 2188 2189typedef struct CHash { 2190 union { 2191 struct in_addr c4_Addr; 2192 struct in6_addr c6_Addr; 2193 } cu_Addr; 2194#define ch_Addr4 cu_Addr.c4_Addr 2195#define ch_Addr6 cu_Addr.c6_Addr 2196 int ch_Family; 2197 time_t ch_LTime; 2198 char *ch_Service; 2199 CTime ch_Times[CHTSIZE]; 2200} CHash; 2201 2202CHash CHashAry[CPMHSIZE]; 2203 2204int 2205cpmip(const struct servtab *sep, int ctrl) 2206{ 2207 struct sockaddr_storage rss; 2208 socklen_t rssLen = sizeof(rss); 2209 int r = 0; 2210 2211 /* 2212 * If getpeername() fails, just let it through (if logging is 2213 * enabled the condition is caught elsewhere) 2214 */ 2215 2216 if (sep->se_maxcpm > 0 && 2217 (sep->se_family == AF_INET || sep->se_family == AF_INET6) && 2218 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2219 time_t t = time(NULL); 2220 int hv = 0xABC3D20F; 2221 int i; 2222 int cnt = 0; 2223 CHash *chBest = NULL; 2224 unsigned int ticks = t / CHTGRAN; 2225 struct sockaddr_in *sin4; 2226#ifdef INET6 2227 struct sockaddr_in6 *sin6; 2228#endif 2229 2230 sin4 = (struct sockaddr_in *)&rss; 2231#ifdef INET6 2232 sin6 = (struct sockaddr_in6 *)&rss; 2233#endif 2234 { 2235 char *p; 2236 int addrlen; 2237 2238 switch (rss.ss_family) { 2239 case AF_INET: 2240 p = (char *)&sin4->sin_addr; 2241 addrlen = sizeof(struct in_addr); 2242 break; 2243#ifdef INET6 2244 case AF_INET6: 2245 p = (char *)&sin6->sin6_addr; 2246 addrlen = sizeof(struct in6_addr); 2247 break; 2248#endif 2249 default: 2250 /* should not happen */ 2251 return -1; 2252 } 2253 2254 for (i = 0; i < addrlen; ++i, ++p) { 2255 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2256 } 2257 hv = (hv ^ (hv >> 16)); 2258 } 2259 for (i = 0; i < 5; ++i) { 2260 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2261 2262 if (rss.ss_family == AF_INET && 2263 ch->ch_Family == AF_INET && 2264 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2265 ch->ch_Service && strcmp(sep->se_service, 2266 ch->ch_Service) == 0) { 2267 chBest = ch; 2268 break; 2269 } 2270#ifdef INET6 2271 if (rss.ss_family == AF_INET6 && 2272 ch->ch_Family == AF_INET6 && 2273 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2274 &ch->ch_Addr6) != 0 && 2275 ch->ch_Service && strcmp(sep->se_service, 2276 ch->ch_Service) == 0) { 2277 chBest = ch; 2278 break; 2279 } 2280#endif 2281 if (chBest == NULL || ch->ch_LTime == 0 || 2282 ch->ch_LTime < chBest->ch_LTime) { 2283 chBest = ch; 2284 } 2285 } 2286 if ((rss.ss_family == AF_INET && 2287 (chBest->ch_Family != AF_INET || 2288 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2289 chBest->ch_Service == NULL || 2290 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2291 chBest->ch_Family = sin4->sin_family; 2292 chBest->ch_Addr4 = sin4->sin_addr; 2293 if (chBest->ch_Service) 2294 free(chBest->ch_Service); 2295 chBest->ch_Service = strdup(sep->se_service); 2296 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2297 } 2298#ifdef INET6 2299 if ((rss.ss_family == AF_INET6 && 2300 (chBest->ch_Family != AF_INET6 || 2301 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2302 &chBest->ch_Addr6) == 0)) || 2303 chBest->ch_Service == NULL || 2304 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2305 chBest->ch_Family = sin6->sin6_family; 2306 chBest->ch_Addr6 = sin6->sin6_addr; 2307 if (chBest->ch_Service) 2308 free(chBest->ch_Service); 2309 chBest->ch_Service = strdup(sep->se_service); 2310 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2311 } 2312#endif 2313 chBest->ch_LTime = t; 2314 { 2315 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2316 if (ct->ct_Ticks != ticks) { 2317 ct->ct_Ticks = ticks; 2318 ct->ct_Count = 0; 2319 } 2320 ++ct->ct_Count; 2321 } 2322 for (i = 0; i < CHTSIZE; ++i) { 2323 CTime *ct = &chBest->ch_Times[i]; 2324 if (ct->ct_Ticks <= ticks && 2325 ct->ct_Ticks >= ticks - CHTSIZE) { 2326 cnt += ct->ct_Count; 2327 } 2328 } 2329 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2330 char pname[NI_MAXHOST]; 2331 2332 getnameinfo((struct sockaddr *)&rss, 2333 ((struct sockaddr *)&rss)->sa_len, 2334 pname, sizeof(pname), NULL, 0, 2335 NI_NUMERICHOST); 2336 r = -1; 2337 syslog(LOG_ERR, 2338 "%s from %s exceeded counts/min (limit %d/min)", 2339 sep->se_service, pname, 2340 sep->se_maxcpm); 2341 } 2342 } 2343 return(r); 2344} 2345 2346static struct conninfo * 2347search_conn(struct servtab *sep, int ctrl) 2348{ 2349 struct sockaddr_storage ss; 2350 socklen_t sslen = sizeof(ss); 2351 struct conninfo *conn; 2352 int hv; 2353 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2354 2355 if (sep->se_maxperip <= 0) 2356 return NULL; 2357 2358 /* 2359 * If getpeername() fails, just let it through (if logging is 2360 * enabled the condition is caught elsewhere) 2361 */ 2362 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2363 return NULL; 2364 2365 switch (ss.ss_family) { 2366 case AF_INET: 2367 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2368 sizeof(struct in_addr)); 2369 break; 2370#ifdef INET6 2371 case AF_INET6: 2372 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2373 sizeof(struct in6_addr)); 2374 break; 2375#endif 2376 default: 2377 /* 2378 * Since we only support AF_INET and AF_INET6, just 2379 * let other than AF_INET and AF_INET6 through. 2380 */ 2381 return NULL; 2382 } 2383 2384 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2385 NULL, 0, NI_NUMERICHOST) != 0) 2386 return NULL; 2387 2388 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2389 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2390 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2391 NI_NUMERICHOST) == 0 && 2392 strcmp(pname, pname2) == 0) 2393 break; 2394 } 2395 2396 if (conn == NULL) { 2397 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2398 syslog(LOG_ERR, "malloc: %m"); 2399 exit(EX_OSERR); 2400 } 2401 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2402 if (conn->co_proc == NULL) { 2403 syslog(LOG_ERR, "malloc: %m"); 2404 exit(EX_OSERR); 2405 } 2406 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2407 conn->co_numchild = 0; 2408 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2409 } 2410 2411 /* 2412 * Since a child process is not invoked yet, we cannot 2413 * determine a pid of a child. So, co_proc and co_numchild 2414 * should be filled leter. 2415 */ 2416 2417 return conn; 2418} 2419 2420static int 2421room_conn(struct servtab *sep, struct conninfo *conn) 2422{ 2423 char pname[NI_MAXHOST]; 2424 2425 if (conn->co_numchild >= sep->se_maxperip) { 2426 getnameinfo((struct sockaddr *)&conn->co_addr, 2427 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2428 NI_NUMERICHOST); 2429 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2430 sep->se_service, pname, sep->se_maxperip); 2431 return 0; 2432 } 2433 return 1; 2434} 2435 2436static void 2437addchild_conn(struct conninfo *conn, pid_t pid) 2438{ 2439 struct procinfo *proc; 2440 2441 if (conn == NULL) 2442 return; 2443 2444 if ((proc = search_proc(pid, 1)) != NULL) { 2445 if (proc->pr_conn != NULL) { 2446 syslog(LOG_ERR, 2447 "addchild_conn: child already on process list"); 2448 exit(EX_OSERR); 2449 } 2450 proc->pr_conn = conn; 2451 } 2452 2453 conn->co_proc[conn->co_numchild++] = proc; 2454} 2455 2456static void 2457reapchild_conn(pid_t pid) 2458{ 2459 struct procinfo *proc; 2460 struct conninfo *conn; 2461 int i; 2462 2463 if ((proc = search_proc(pid, 0)) == NULL) 2464 return; 2465 if ((conn = proc->pr_conn) == NULL) 2466 return; 2467 for (i = 0; i < conn->co_numchild; ++i) 2468 if (conn->co_proc[i] == proc) { 2469 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2470 break; 2471 } 2472 free_proc(proc); 2473 free_conn(conn); 2474} 2475 2476static void 2477resize_conn(struct servtab *sep, int maxpip) 2478{ 2479 struct conninfo *conn; 2480 int i, j; 2481 2482 if (sep->se_maxperip <= 0) 2483 return; 2484 if (maxpip <= 0) { 2485 free_connlist(sep); 2486 return; 2487 } 2488 for (i = 0; i < PERIPSIZE; ++i) { 2489 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2490 for (j = maxpip; j < conn->co_numchild; ++j) 2491 free_proc(conn->co_proc[j]); 2492 conn->co_proc = realloc(conn->co_proc, 2493 maxpip * sizeof(*conn->co_proc)); 2494 if (conn->co_proc == NULL) { 2495 syslog(LOG_ERR, "realloc: %m"); 2496 exit(EX_OSERR); 2497 } 2498 if (conn->co_numchild > maxpip) 2499 conn->co_numchild = maxpip; 2500 } 2501 } 2502} 2503 2504static void 2505free_connlist(struct servtab *sep) 2506{ 2507 struct conninfo *conn; 2508 int i, j; 2509 2510 for (i = 0; i < PERIPSIZE; ++i) { 2511 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2512 for (j = 0; j < conn->co_numchild; ++j) 2513 free_proc(conn->co_proc[j]); 2514 conn->co_numchild = 0; 2515 free_conn(conn); 2516 } 2517 } 2518} 2519 2520static void 2521free_conn(struct conninfo *conn) 2522{ 2523 if (conn == NULL) 2524 return; 2525 if (conn->co_numchild <= 0) { 2526 LIST_REMOVE(conn, co_link); 2527 free(conn->co_proc); 2528 free(conn); 2529 } 2530} 2531 2532static struct procinfo * 2533search_proc(pid_t pid, int add) 2534{ 2535 struct procinfo *proc; 2536 int hv; 2537 2538 hv = hashval((char *)&pid, sizeof(pid)); 2539 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2540 if (proc->pr_pid == pid) 2541 break; 2542 } 2543 if (proc == NULL && add) { 2544 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2545 syslog(LOG_ERR, "malloc: %m"); 2546 exit(EX_OSERR); 2547 } 2548 proc->pr_pid = pid; 2549 proc->pr_conn = NULL; 2550 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2551 } 2552 return proc; 2553} 2554 2555static void 2556free_proc(struct procinfo *proc) 2557{ 2558 if (proc == NULL) 2559 return; 2560 LIST_REMOVE(proc, pr_link); 2561 free(proc); 2562} 2563 2564static int 2565hashval(char *p, int len) 2566{ 2567 int i, hv = 0xABC3D20F; 2568 2569 for (i = 0; i < len; ++i, ++p) 2570 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2571 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2572 return hv; 2573} 2574