1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #ifndef lint 36 __COPYRIGHT("@(#) 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 /* 47 * Inetd - Internet super-server 48 * 49 * This program invokes all internet services as needed. Connection-oriented 50 * services are invoked each time a connection is made, by creating a process. 51 * This process is passed the connection as file descriptor 0 and is expected 52 * to do a getpeername to find out the source host and port. 53 * 54 * Datagram oriented services are invoked when a datagram 55 * arrives; a process is created and passed a pending message 56 * on file descriptor 0. Datagram servers may either connect 57 * to their peer, freeing up the original socket for inetd 58 * to receive further messages on, or ``take over the socket'', 59 * processing all arriving datagrams and, eventually, timing 60 * out. The first type of server is said to be ``multi-threaded''; 61 * the second type of server ``single-threaded''. 62 * 63 * Inetd uses a configuration file which is read at startup 64 * and, possibly, at some later time in response to a hangup signal. 65 * The configuration file is ``free format'' with fields given in the 66 * order shown below. Continuation lines for an entry must begin with 67 * a space or tab. All fields must be present in each entry. 68 * 69 * service name must be in /etc/services 70 * or name a tcpmux service 71 * or specify a unix domain socket 72 * socket type stream/dgram/raw/rdm/seqpacket 73 * protocol tcp[4][6], udp[4][6], unix 74 * wait/nowait single-threaded/multi-threaded 75 * user[:group][/login-class] user/group/login-class to run daemon as 76 * server program full path name 77 * server program arguments maximum of MAXARGS (20) 78 * 79 * TCP services without official port numbers are handled with the 80 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 81 * requests. When a connection is made from a foreign host, the service 82 * requested is passed to tcpmux, which looks it up in the servtab list 83 * and returns the proper entry for the service. Tcpmux returns a 84 * negative reply if the service doesn't exist, otherwise the invoked 85 * server is expected to return the positive reply if the service type in 86 * inetd.conf file has the prefix "tcpmux/". If the service type has the 87 * prefix "tcpmux/+", tcpmux will return the positive reply for the 88 * process; this is for compatibility with older server code, and also 89 * allows you to invoke programs that use stdin/stdout without putting any 90 * special server code in them. Services that use tcpmux are "nowait" 91 * because they do not have a well-known port and hence cannot listen 92 * for new requests. 93 * 94 * For RPC services 95 * service name/version must be in /etc/rpc 96 * socket type stream/dgram/raw/rdm/seqpacket 97 * protocol rpc/tcp[4][6], rpc/udp[4][6] 98 * wait/nowait single-threaded/multi-threaded 99 * user[:group][/login-class] user/group/login-class to run daemon as 100 * server program full path name 101 * server program arguments maximum of MAXARGS 102 * 103 * Comment lines are indicated by a `#' in column 1. 104 * 105 * #ifdef IPSEC 106 * Comment lines that start with "#@" denote IPsec policy string, as described 107 * in ipsec_set_policy(3). This will affect all the following items in 108 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 109 * there's no IPsec policy. 110 * #endif 111 */ 112 #include <sys/param.h> 113 #include <sys/ioctl.h> 114 #include <sys/mman.h> 115 #include <sys/wait.h> 116 #include <sys/time.h> 117 #include <sys/resource.h> 118 #include <sys/stat.h> 119 #include <sys/un.h> 120 121 #include <netinet/in.h> 122 #include <netinet/tcp.h> 123 #include <arpa/inet.h> 124 #include <rpc/rpc.h> 125 #include <rpc/pmap_clnt.h> 126 127 #include <ctype.h> 128 #include <errno.h> 129 #include <err.h> 130 #include <fcntl.h> 131 #include <grp.h> 132 #include <libutil.h> 133 #include <limits.h> 134 #include <netdb.h> 135 #include <pwd.h> 136 #include <signal.h> 137 #include <stdio.h> 138 #include <stdlib.h> 139 #include <string.h> 140 #include <sysexits.h> 141 #include <syslog.h> 142 #ifdef LIBWRAP 143 #include <tcpd.h> 144 #endif 145 #include <unistd.h> 146 147 #include "inetd.h" 148 #include "pathnames.h" 149 150 #ifdef IPSEC 151 #include <netipsec/ipsec.h> 152 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 153 #undef IPSEC 154 #endif 155 #endif 156 157 #ifndef LIBWRAP_ALLOW_FACILITY 158 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 159 #endif 160 #ifndef LIBWRAP_ALLOW_SEVERITY 161 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 162 #endif 163 #ifndef LIBWRAP_DENY_FACILITY 164 # define LIBWRAP_DENY_FACILITY LOG_AUTH 165 #endif 166 #ifndef LIBWRAP_DENY_SEVERITY 167 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 168 #endif 169 170 #define ISWRAP(sep) \ 171 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 172 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 173 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 174 || (sep)->se_socktype == SOCK_DGRAM)) 175 176 #ifdef LOGIN_CAP 177 #include <login_cap.h> 178 179 /* see init.c */ 180 #define RESOURCE_RC "daemon" 181 182 #endif 183 184 #ifndef MAXCHILD 185 #define MAXCHILD -1 /* maximum number of this service 186 < 0 = no limit */ 187 #endif 188 189 #ifndef MAXCPM 190 #define MAXCPM -1 /* rate limit invocations from a 191 single remote address, 192 < 0 = no limit */ 193 #endif 194 195 #ifndef MAXPERIP 196 #define MAXPERIP -1 /* maximum number of this service 197 from a single remote address, 198 < 0 = no limit */ 199 #endif 200 201 #ifndef TOOMANY 202 #define TOOMANY 256 /* don't start more than TOOMANY */ 203 #endif 204 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 205 #define RETRYTIME (60*10) /* retry after bind or server fail */ 206 #define MAX_MAXCHLD 32767 /* max allowable max children */ 207 208 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 209 210 #define satosin(sa) ((struct sockaddr_in *)(void *)sa) 211 #define csatosin(sa) ((const struct sockaddr_in *)(const void *)sa) 212 #ifdef INET6 213 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)sa) 214 #define csatosin6(sa) ((const struct sockaddr_in6 *)(const void *)sa) 215 #endif 216 static void close_sep(struct servtab *); 217 static void flag_signal(int); 218 static void config(void); 219 static int cpmip(const struct servtab *, int); 220 static void endconfig(void); 221 static struct servtab *enter(struct servtab *); 222 static void freeconfig(struct servtab *); 223 static struct servtab *getconfigent(void); 224 static int matchservent(const char *, const char *, const char *); 225 static char *nextline(FILE *); 226 static void addchild(struct servtab *, int); 227 static void reapchild(void); 228 static void enable(struct servtab *); 229 static void disable(struct servtab *); 230 static void retry(void); 231 static int setconfig(void); 232 static void setup(struct servtab *); 233 #ifdef IPSEC 234 static void ipsecsetup(struct servtab *); 235 #endif 236 static void unregisterrpc(register struct servtab *sep); 237 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 238 static int room_conn(struct servtab *sep, struct conninfo *conn); 239 static void addchild_conn(struct conninfo *conn, pid_t pid); 240 static void reapchild_conn(pid_t pid); 241 static void free_conn(struct conninfo *conn); 242 static void resize_conn(struct servtab *sep, int maxperip); 243 static void free_connlist(struct servtab *sep); 244 static void free_proc(struct procinfo *); 245 static struct procinfo *search_proc(pid_t pid, int add); 246 static int hashval(char *p, int len); 247 static char *skip(char **); 248 static char *sskip(char **); 249 static char *newstr(const char *); 250 static void print_service(const char *, const struct servtab *); 251 252 #ifdef LIBWRAP 253 /* tcpd.h */ 254 int allow_severity; 255 int deny_severity; 256 #endif 257 258 static int wrap_ex = 0; 259 static int wrap_bi = 0; 260 int debug = 0; 261 static int dolog = 0; 262 static int maxsock; /* highest-numbered descriptor */ 263 static fd_set allsock; 264 static int options; 265 static int timingout; 266 static int toomany = TOOMANY; 267 static int maxchild = MAXCHILD; 268 static int maxcpm = MAXCPM; 269 static int maxperip = MAXPERIP; 270 static struct servent *sp; 271 static struct rpcent *rpc; 272 static char *hostname = NULL; 273 static struct sockaddr_in *bind_sa4; 274 static int v4bind_ok = 0; 275 #ifdef INET6 276 static struct sockaddr_in6 *bind_sa6; 277 static int v6bind_ok = 0; 278 #endif 279 static int signalpipe[2]; 280 #ifdef SANITY_CHECK 281 static int nsock; 282 #endif 283 static uid_t euid; 284 static gid_t egid; 285 static mode_t mask; 286 287 struct servtab *servtab; 288 289 static const char *CONFIG = _PATH_INETDCONF; 290 static const char *pid_file = _PATH_INETDPID; 291 static struct pidfh *pfh = NULL; 292 293 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 294 295 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 296 297 static int 298 getvalue(const char *arg, int *value, const char *whine) 299 { 300 int tmp; 301 char *p; 302 303 tmp = strtol(arg, &p, 0); 304 if (tmp < 0 || *p) { 305 syslog(LOG_ERR, whine, arg); 306 return 1; /* failure */ 307 } 308 *value = tmp; 309 return 0; /* success */ 310 } 311 312 #ifdef LIBWRAP 313 static sa_family_t 314 whichaf(struct request_info *req) 315 { 316 struct sockaddr *sa; 317 318 sa = (struct sockaddr *)req->client->sin; 319 if (sa == NULL) 320 return AF_UNSPEC; 321 #ifdef INET6 322 if (sa->sa_family == AF_INET6 && 323 IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr)) 324 return AF_INET; 325 #endif 326 return sa->sa_family; 327 } 328 #endif 329 330 int 331 main(int argc, char **argv) 332 { 333 struct servtab *sep; 334 struct passwd *pwd; 335 struct group *grp; 336 struct sigaction sa, saalrm, sachld, sahup, sapipe; 337 int ch, dofork; 338 pid_t pid; 339 char buf[50]; 340 #ifdef LOGIN_CAP 341 login_cap_t *lc = NULL; 342 #endif 343 #ifdef LIBWRAP 344 struct request_info req; 345 int denied; 346 char *service = NULL; 347 #endif 348 struct sockaddr_storage peer; 349 int i; 350 struct addrinfo hints, *res; 351 const char *servname; 352 int error; 353 struct conninfo *conn; 354 355 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 356 357 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 358 switch(ch) { 359 case 'd': 360 debug = 1; 361 options |= SO_DEBUG; 362 break; 363 case 'l': 364 dolog = 1; 365 break; 366 case 'R': 367 getvalue(optarg, &toomany, 368 "-R %s: bad value for service invocation rate"); 369 break; 370 case 'c': 371 getvalue(optarg, &maxchild, 372 "-c %s: bad value for maximum children"); 373 break; 374 case 'C': 375 getvalue(optarg, &maxcpm, 376 "-C %s: bad value for maximum children/minute"); 377 break; 378 case 'a': 379 hostname = optarg; 380 break; 381 case 'p': 382 pid_file = optarg; 383 break; 384 case 's': 385 getvalue(optarg, &maxperip, 386 "-s %s: bad value for maximum children per source address"); 387 break; 388 case 'w': 389 wrap_ex++; 390 break; 391 case 'W': 392 wrap_bi++; 393 break; 394 case '?': 395 default: 396 syslog(LOG_ERR, 397 "usage: inetd [-dlwW] [-a address] [-R rate]" 398 " [-c maximum] [-C rate]" 399 " [-p pidfile] [conf-file]"); 400 exit(EX_USAGE); 401 } 402 /* 403 * Initialize Bind Addrs. 404 * When hostname is NULL, wild card bind addrs are obtained from 405 * getaddrinfo(). But getaddrinfo() requires at least one of 406 * hostname or servname is non NULL. 407 * So when hostname is NULL, set dummy value to servname. 408 * Since getaddrinfo() doesn't accept numeric servname, and 409 * we doesn't use ai_socktype of struct addrinfo returned 410 * from getaddrinfo(), we set dummy value to ai_socktype. 411 */ 412 servname = (hostname == NULL) ? "0" /* dummy */ : NULL; 413 414 memset(&hints, 0, sizeof(struct addrinfo)); 415 hints.ai_flags = AI_PASSIVE; 416 hints.ai_family = AF_UNSPEC; 417 hints.ai_socktype = SOCK_STREAM; /* dummy */ 418 error = getaddrinfo(hostname, servname, &hints, &res); 419 if (error != 0) { 420 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 421 if (error == EAI_SYSTEM) 422 syslog(LOG_ERR, "%s", strerror(errno)); 423 exit(EX_USAGE); 424 } 425 do { 426 if (res->ai_addr == NULL) { 427 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 428 exit(EX_USAGE); 429 } 430 switch (res->ai_addr->sa_family) { 431 case AF_INET: 432 if (v4bind_ok) 433 continue; 434 bind_sa4 = satosin(res->ai_addr); 435 /* init port num in case servname is dummy */ 436 bind_sa4->sin_port = 0; 437 v4bind_ok = 1; 438 continue; 439 #ifdef INET6 440 case AF_INET6: 441 if (v6bind_ok) 442 continue; 443 bind_sa6 = satosin6(res->ai_addr); 444 /* init port num in case servname is dummy */ 445 bind_sa6->sin6_port = 0; 446 v6bind_ok = 1; 447 continue; 448 #endif 449 } 450 if (v4bind_ok 451 #ifdef INET6 452 && v6bind_ok 453 #endif 454 ) 455 break; 456 } while ((res = res->ai_next) != NULL); 457 if (!v4bind_ok 458 #ifdef INET6 459 && !v6bind_ok 460 #endif 461 ) { 462 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 463 exit(EX_USAGE); 464 } 465 466 euid = geteuid(); 467 egid = getegid(); 468 umask(mask = umask(0777)); 469 470 argc -= optind; 471 argv += optind; 472 473 if (argc > 0) 474 CONFIG = argv[0]; 475 if (access(CONFIG, R_OK) < 0) 476 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG); 477 if (debug == 0) { 478 pid_t otherpid; 479 480 pfh = pidfile_open(pid_file, 0600, &otherpid); 481 if (pfh == NULL) { 482 if (errno == EEXIST) { 483 syslog(LOG_ERR, "%s already running, pid: %d", 484 getprogname(), otherpid); 485 exit(EX_OSERR); 486 } 487 syslog(LOG_WARNING, "pidfile_open() failed: %m"); 488 } 489 490 if (daemon(0, 0) < 0) { 491 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 492 } 493 /* From now on we don't want syslog messages going to stderr. */ 494 closelog(); 495 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 496 /* 497 * In case somebody has started inetd manually, we need to 498 * clear the logname, so that old servers run as root do not 499 * get the user's logname.. 500 */ 501 if (setlogin("") < 0) { 502 syslog(LOG_WARNING, "cannot clear logname: %m"); 503 /* no big deal if it fails.. */ 504 } 505 if (pfh != NULL && pidfile_write(pfh) == -1) { 506 syslog(LOG_WARNING, "pidfile_write(): %m"); 507 } 508 } 509 510 if (madvise(NULL, 0, MADV_PROTECT) != 0) 511 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno)); 512 513 for (i = 0; i < PERIPSIZE; ++i) 514 LIST_INIT(&proctable[i]); 515 516 if (v4bind_ok) { 517 udpconf = getnetconfigent("udp"); 518 tcpconf = getnetconfigent("tcp"); 519 if (udpconf == NULL || tcpconf == NULL) { 520 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 521 exit(EX_USAGE); 522 } 523 } 524 #ifdef INET6 525 if (v6bind_ok) { 526 udp6conf = getnetconfigent("udp6"); 527 tcp6conf = getnetconfigent("tcp6"); 528 if (udp6conf == NULL || tcp6conf == NULL) { 529 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 530 exit(EX_USAGE); 531 } 532 } 533 #endif 534 535 sa = (struct sigaction){ 536 .sa_flags = 0, 537 .sa_handler = flag_signal, 538 }; 539 sigemptyset(&sa.sa_mask); 540 sigaddset(&sa.sa_mask, SIGALRM); 541 sigaddset(&sa.sa_mask, SIGCHLD); 542 sigaddset(&sa.sa_mask, SIGHUP); 543 sigaction(SIGALRM, &sa, &saalrm); 544 config(); 545 sigaction(SIGHUP, &sa, &sahup); 546 sigaction(SIGCHLD, &sa, &sachld); 547 sa.sa_handler = SIG_IGN; 548 sigaction(SIGPIPE, &sa, &sapipe); 549 550 { 551 /* space for daemons to overwrite environment for ps */ 552 #define DUMMYSIZE 100 553 char dummy[DUMMYSIZE]; 554 555 (void)memset(dummy, 'x', DUMMYSIZE - 1); 556 dummy[DUMMYSIZE - 1] = '\0'; 557 (void)setenv("inetd_dummy", dummy, 1); 558 } 559 560 if (pipe2(signalpipe, O_CLOEXEC) != 0) { 561 syslog(LOG_ERR, "pipe: %m"); 562 exit(EX_OSERR); 563 } 564 FD_SET(signalpipe[0], &allsock); 565 #ifdef SANITY_CHECK 566 nsock++; 567 #endif 568 maxsock = MAX(MAX(maxsock, signalpipe[0]), signalpipe[1]); 569 570 for (;;) { 571 int n, ctrl; 572 fd_set readable; 573 574 #ifdef SANITY_CHECK 575 if (nsock == 0) { 576 syslog(LOG_ERR, "%s: nsock=0", __func__); 577 exit(EX_SOFTWARE); 578 } 579 #endif 580 readable = allsock; 581 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 582 (fd_set *)0, (struct timeval *)0)) <= 0) { 583 if (n < 0 && errno != EINTR) { 584 syslog(LOG_WARNING, "select: %m"); 585 sleep(1); 586 } 587 continue; 588 } 589 /* handle any queued signal flags */ 590 if (FD_ISSET(signalpipe[0], &readable)) { 591 int nsig, signo; 592 593 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 594 syslog(LOG_ERR, "ioctl: %m"); 595 exit(EX_OSERR); 596 } 597 nsig /= sizeof(signo); 598 while (--nsig >= 0) { 599 size_t len; 600 601 len = read(signalpipe[0], &signo, sizeof(signo)); 602 if (len != sizeof(signo)) { 603 syslog(LOG_ERR, "read: %m"); 604 exit(EX_OSERR); 605 } 606 if (debug) 607 warnx("handling signal flag %d", signo); 608 switch (signo) { 609 case SIGALRM: 610 retry(); 611 break; 612 case SIGCHLD: 613 reapchild(); 614 break; 615 case SIGHUP: 616 config(); 617 break; 618 } 619 } 620 } 621 for (sep = servtab; n && sep; sep = sep->se_next) 622 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 623 n--; 624 if (debug) 625 warnx("someone wants %s", sep->se_service); 626 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 627 conn = NULL; 628 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 629 i = 1; 630 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 631 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 632 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 633 (socklen_t *)0); 634 if (debug) 635 warnx("accept, ctrl %d", ctrl); 636 if (ctrl < 0) { 637 if (errno != EINTR) 638 syslog(LOG_WARNING, 639 "accept (for %s): %m", 640 sep->se_service); 641 if (sep->se_accept && 642 sep->se_socktype == SOCK_STREAM) 643 close(ctrl); 644 continue; 645 } 646 i = 0; 647 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 648 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 649 if (ioctl(ctrl, FIONBIO, &i) < 0) 650 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 651 if (cpmip(sep, ctrl) < 0) { 652 close(ctrl); 653 continue; 654 } 655 if (dofork && 656 (conn = search_conn(sep, ctrl)) != NULL && 657 !room_conn(sep, conn)) { 658 close(ctrl); 659 continue; 660 } 661 } else 662 ctrl = sep->se_fd; 663 if (dolog && !ISWRAP(sep)) { 664 char pname[NI_MAXHOST] = "unknown"; 665 socklen_t sl; 666 sl = sizeof(peer); 667 if (getpeername(ctrl, (struct sockaddr *) 668 &peer, &sl)) { 669 sl = sizeof(peer); 670 if (recvfrom(ctrl, buf, sizeof(buf), 671 MSG_PEEK, 672 (struct sockaddr *)&peer, 673 &sl) >= 0) { 674 getnameinfo((struct sockaddr *)&peer, 675 peer.ss_len, 676 pname, sizeof(pname), 677 NULL, 0, NI_NUMERICHOST); 678 } 679 } else { 680 getnameinfo((struct sockaddr *)&peer, 681 peer.ss_len, 682 pname, sizeof(pname), 683 NULL, 0, NI_NUMERICHOST); 684 } 685 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 686 } 687 (void) sigblock(SIGBLOCK); 688 pid = 0; 689 /* 690 * Fork for all external services, builtins which need to 691 * fork and anything we're wrapping (as wrapping might 692 * block or use hosts_options(5) twist). 693 */ 694 if (dofork) { 695 if (sep->se_count++ == 0) 696 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time); 697 else if (toomany > 0 && sep->se_count >= toomany) { 698 struct timespec now; 699 700 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now); 701 if (now.tv_sec - sep->se_time.tv_sec > 702 CNT_INTVL) { 703 sep->se_time = now; 704 sep->se_count = 1; 705 } else { 706 syslog(LOG_ERR, 707 "%s/%s server failing (looping), service terminated", 708 sep->se_service, sep->se_proto); 709 if (sep->se_accept && 710 sep->se_socktype == SOCK_STREAM) 711 close(ctrl); 712 close_sep(sep); 713 free_conn(conn); 714 sigsetmask(0L); 715 if (!timingout) { 716 timingout = 1; 717 alarm(RETRYTIME); 718 } 719 continue; 720 } 721 } 722 pid = fork(); 723 } 724 if (pid < 0) { 725 syslog(LOG_ERR, "fork: %m"); 726 if (sep->se_accept && 727 sep->se_socktype == SOCK_STREAM) 728 close(ctrl); 729 free_conn(conn); 730 sigsetmask(0L); 731 sleep(1); 732 continue; 733 } 734 if (pid) { 735 addchild_conn(conn, pid); 736 addchild(sep, pid); 737 } 738 sigsetmask(0L); 739 if (pid == 0) { 740 pidfile_close(pfh); 741 if (dofork) { 742 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 743 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 744 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 745 /* SIGPIPE reset before exec */ 746 } 747 /* 748 * Call tcpmux to find the real service to exec. 749 */ 750 if (sep->se_bi && 751 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 752 sep = tcpmux(ctrl); 753 if (sep == NULL) { 754 close(ctrl); 755 _exit(0); 756 } 757 } 758 #ifdef LIBWRAP 759 if (ISWRAP(sep)) { 760 inetd_setproctitle("wrapping", ctrl); 761 service = sep->se_server_name ? 762 sep->se_server_name : sep->se_service; 763 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0); 764 fromhost(&req); 765 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 766 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 767 denied = !hosts_access(&req); 768 if (denied) { 769 syslog(deny_severity, 770 "refused connection from %.500s, service %s (%s%s)", 771 eval_client(&req), service, sep->se_proto, 772 (whichaf(&req) == AF_INET6) ? "6" : ""); 773 if (sep->se_socktype != SOCK_STREAM) 774 recv(ctrl, buf, sizeof (buf), 0); 775 if (dofork) { 776 sleep(1); 777 _exit(0); 778 } 779 } 780 if (dolog) { 781 syslog(allow_severity, 782 "connection from %.500s, service %s (%s%s)", 783 eval_client(&req), service, sep->se_proto, 784 (whichaf(&req) == AF_INET6) ? "6" : ""); 785 } 786 } 787 #endif 788 if (sep->se_bi) { 789 (*sep->se_bi->bi_fn)(ctrl, sep); 790 } else { 791 if (debug) 792 warnx("%d execl %s", 793 getpid(), sep->se_server); 794 /* Clear close-on-exec. */ 795 if (fcntl(ctrl, F_SETFD, 0) < 0) { 796 syslog(LOG_ERR, 797 "%s/%s: fcntl (F_SETFD, 0): %m", 798 sep->se_service, sep->se_proto); 799 _exit(EX_OSERR); 800 } 801 if (ctrl != 0) { 802 dup2(ctrl, 0); 803 close(ctrl); 804 } 805 dup2(0, 1); 806 dup2(0, 2); 807 if ((pwd = getpwnam(sep->se_user)) == NULL) { 808 syslog(LOG_ERR, 809 "%s/%s: %s: no such user", 810 sep->se_service, sep->se_proto, 811 sep->se_user); 812 if (sep->se_socktype != SOCK_STREAM) 813 recv(0, buf, sizeof (buf), 0); 814 _exit(EX_NOUSER); 815 } 816 grp = NULL; 817 if ( sep->se_group != NULL 818 && (grp = getgrnam(sep->se_group)) == NULL 819 ) { 820 syslog(LOG_ERR, 821 "%s/%s: %s: no such group", 822 sep->se_service, sep->se_proto, 823 sep->se_group); 824 if (sep->se_socktype != SOCK_STREAM) 825 recv(0, buf, sizeof (buf), 0); 826 _exit(EX_NOUSER); 827 } 828 if (grp != NULL) 829 pwd->pw_gid = grp->gr_gid; 830 #ifdef LOGIN_CAP 831 if ((lc = login_getclass(sep->se_class)) == NULL) { 832 /* error syslogged by getclass */ 833 syslog(LOG_ERR, 834 "%s/%s: %s: login class error", 835 sep->se_service, sep->se_proto, 836 sep->se_class); 837 if (sep->se_socktype != SOCK_STREAM) 838 recv(0, buf, sizeof (buf), 0); 839 _exit(EX_NOUSER); 840 } 841 #endif 842 if (setsid() < 0) { 843 syslog(LOG_ERR, 844 "%s: can't setsid(): %m", 845 sep->se_service); 846 /* _exit(EX_OSERR); not fatal yet */ 847 } 848 #ifdef LOGIN_CAP 849 if (setusercontext(lc, pwd, pwd->pw_uid, 850 LOGIN_SETALL & ~LOGIN_SETMAC) 851 != 0) { 852 syslog(LOG_ERR, 853 "%s: can't setusercontext(..%s..): %m", 854 sep->se_service, sep->se_user); 855 _exit(EX_OSERR); 856 } 857 login_close(lc); 858 #else 859 if (pwd->pw_uid) { 860 if (setlogin(sep->se_user) < 0) { 861 syslog(LOG_ERR, 862 "%s: can't setlogin(%s): %m", 863 sep->se_service, sep->se_user); 864 /* _exit(EX_OSERR); not yet */ 865 } 866 if (setgid(pwd->pw_gid) < 0) { 867 syslog(LOG_ERR, 868 "%s: can't set gid %d: %m", 869 sep->se_service, pwd->pw_gid); 870 _exit(EX_OSERR); 871 } 872 (void) initgroups(pwd->pw_name, 873 pwd->pw_gid); 874 if (setuid(pwd->pw_uid) < 0) { 875 syslog(LOG_ERR, 876 "%s: can't set uid %d: %m", 877 sep->se_service, pwd->pw_uid); 878 _exit(EX_OSERR); 879 } 880 } 881 #endif 882 sigaction(SIGPIPE, &sapipe, 883 (struct sigaction *)0); 884 execv(sep->se_server, sep->se_argv); 885 syslog(LOG_ERR, 886 "cannot execute %s: %m", sep->se_server); 887 if (sep->se_socktype != SOCK_STREAM) 888 recv(0, buf, sizeof (buf), 0); 889 } 890 if (dofork) 891 _exit(0); 892 } 893 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 894 close(ctrl); 895 } 896 } 897 } 898 899 /* 900 * Add a signal flag to the signal flag queue for later handling 901 */ 902 903 static void 904 flag_signal(int signo) 905 { 906 size_t len; 907 908 len = write(signalpipe[1], &signo, sizeof(signo)); 909 if (len != sizeof(signo)) { 910 syslog(LOG_ERR, "write: %m"); 911 _exit(EX_OSERR); 912 } 913 } 914 915 /* 916 * Record a new child pid for this service. If we've reached the 917 * limit on children, then stop accepting incoming requests. 918 */ 919 920 static void 921 addchild(struct servtab *sep, pid_t pid) 922 { 923 struct stabchild *sc; 924 925 #ifdef SANITY_CHECK 926 if (SERVTAB_EXCEEDS_LIMIT(sep)) { 927 syslog(LOG_ERR, "%s: %d >= %d", 928 __func__, sep->se_numchild, sep->se_maxchild); 929 exit(EX_SOFTWARE); 930 } 931 #endif 932 sc = calloc(1, sizeof(*sc)); 933 if (sc == NULL) { 934 syslog(LOG_ERR, "calloc: %m"); 935 exit(EX_OSERR); 936 } 937 sc->sc_pid = pid; 938 LIST_INSERT_HEAD(&sep->se_children, sc, sc_link); 939 ++sep->se_numchild; 940 if (SERVTAB_AT_LIMIT(sep)) 941 disable(sep); 942 } 943 944 static void 945 reapchild(void) 946 { 947 int status; 948 pid_t pid; 949 struct stabchild *sc; 950 struct servtab *sep; 951 952 for (;;) { 953 pid = wait3(&status, WNOHANG, (struct rusage *)0); 954 if (pid <= 0) 955 break; 956 if (debug) 957 warnx("%d reaped, %s %u", pid, 958 WIFEXITED(status) ? "status" : "signal", 959 WIFEXITED(status) ? WEXITSTATUS(status) 960 : WTERMSIG(status)); 961 for (sep = servtab; sep; sep = sep->se_next) { 962 LIST_FOREACH(sc, &sep->se_children, sc_link) { 963 if (sc->sc_pid == pid) 964 break; 965 } 966 if (sc == NULL) 967 continue; 968 if (SERVTAB_AT_LIMIT(sep)) 969 enable(sep); 970 LIST_REMOVE(sc, sc_link); 971 free(sc); 972 --sep->se_numchild; 973 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 974 syslog(LOG_WARNING, 975 "%s[%d]: exited, %s %u", 976 sep->se_server, pid, 977 WIFEXITED(status) ? "status" : "signal", 978 WIFEXITED(status) ? WEXITSTATUS(status) 979 : WTERMSIG(status)); 980 break; 981 } 982 reapchild_conn(pid); 983 } 984 } 985 986 static void 987 config(void) 988 { 989 struct servtab *sep, *new, **sepp; 990 long omask; 991 int new_nomapped; 992 #ifdef LOGIN_CAP 993 login_cap_t *lc = NULL; 994 #endif 995 996 if (!setconfig()) { 997 syslog(LOG_ERR, "%s: %m", CONFIG); 998 return; 999 } 1000 for (sep = servtab; sep; sep = sep->se_next) 1001 sep->se_checked = 0; 1002 while ((new = getconfigent())) { 1003 if (getpwnam(new->se_user) == NULL) { 1004 syslog(LOG_ERR, 1005 "%s/%s: no such user '%s', service ignored", 1006 new->se_service, new->se_proto, new->se_user); 1007 continue; 1008 } 1009 if (new->se_group && getgrnam(new->se_group) == NULL) { 1010 syslog(LOG_ERR, 1011 "%s/%s: no such group '%s', service ignored", 1012 new->se_service, new->se_proto, new->se_group); 1013 continue; 1014 } 1015 #ifdef LOGIN_CAP 1016 if ((lc = login_getclass(new->se_class)) == NULL) { 1017 /* error syslogged by getclass */ 1018 syslog(LOG_ERR, 1019 "%s/%s: %s: login class error, service ignored", 1020 new->se_service, new->se_proto, new->se_class); 1021 continue; 1022 } 1023 login_close(lc); 1024 #endif 1025 new_nomapped = new->se_nomapped; 1026 for (sep = servtab; sep; sep = sep->se_next) 1027 if (strcmp(sep->se_service, new->se_service) == 0 && 1028 strcmp(sep->se_proto, new->se_proto) == 0 && 1029 sep->se_rpc == new->se_rpc && 1030 sep->se_socktype == new->se_socktype && 1031 sep->se_family == new->se_family) 1032 break; 1033 if (sep != 0) { 1034 int i; 1035 1036 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 1037 omask = sigblock(SIGBLOCK); 1038 if (sep->se_nomapped != new->se_nomapped) { 1039 /* for rpc keep old nommaped till unregister */ 1040 if (!sep->se_rpc) 1041 sep->se_nomapped = new->se_nomapped; 1042 sep->se_reset = 1; 1043 } 1044 1045 /* 1046 * The children tracked remain; we want numchild to 1047 * still reflect how many jobs are running so we don't 1048 * throw off our accounting. 1049 */ 1050 sep->se_maxcpm = new->se_maxcpm; 1051 sep->se_maxchild = new->se_maxchild; 1052 resize_conn(sep, new->se_maxperip); 1053 sep->se_maxperip = new->se_maxperip; 1054 sep->se_bi = new->se_bi; 1055 /* might need to turn on or off service now */ 1056 if (sep->se_fd >= 0) { 1057 if (SERVTAB_EXCEEDS_LIMIT(sep)) { 1058 if (FD_ISSET(sep->se_fd, &allsock)) 1059 disable(sep); 1060 } else { 1061 if (!FD_ISSET(sep->se_fd, &allsock)) 1062 enable(sep); 1063 } 1064 } 1065 sep->se_accept = new->se_accept; 1066 SWAP(char *, sep->se_user, new->se_user); 1067 SWAP(char *, sep->se_group, new->se_group); 1068 #ifdef LOGIN_CAP 1069 SWAP(char *, sep->se_class, new->se_class); 1070 #endif 1071 SWAP(char *, sep->se_server, new->se_server); 1072 SWAP(char *, sep->se_server_name, new->se_server_name); 1073 for (i = 0; i < MAXARGV; i++) 1074 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1075 #ifdef IPSEC 1076 SWAP(char *, sep->se_policy, new->se_policy); 1077 ipsecsetup(sep); 1078 #endif 1079 sigsetmask(omask); 1080 freeconfig(new); 1081 if (debug) 1082 print_service("REDO", sep); 1083 } else { 1084 sep = enter(new); 1085 if (debug) 1086 print_service("ADD ", sep); 1087 } 1088 sep->se_checked = 1; 1089 if (ISMUX(sep)) { 1090 sep->se_fd = -1; 1091 continue; 1092 } 1093 switch (sep->se_family) { 1094 case AF_INET: 1095 if (!v4bind_ok) { 1096 sep->se_fd = -1; 1097 continue; 1098 } 1099 break; 1100 #ifdef INET6 1101 case AF_INET6: 1102 if (!v6bind_ok) { 1103 sep->se_fd = -1; 1104 continue; 1105 } 1106 break; 1107 #endif 1108 } 1109 if (!sep->se_rpc) { 1110 if (sep->se_family != AF_UNIX) { 1111 sp = getservbyname(sep->se_service, sep->se_proto); 1112 if (sp == 0) { 1113 syslog(LOG_ERR, "%s/%s: unknown service", 1114 sep->se_service, sep->se_proto); 1115 sep->se_checked = 0; 1116 continue; 1117 } 1118 } 1119 switch (sep->se_family) { 1120 case AF_INET: 1121 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1122 sep->se_ctrladdr4.sin_port = 1123 sp->s_port; 1124 sep->se_reset = 1; 1125 } 1126 break; 1127 #ifdef INET6 1128 case AF_INET6: 1129 if (sp->s_port != 1130 sep->se_ctrladdr6.sin6_port) { 1131 sep->se_ctrladdr6.sin6_port = 1132 sp->s_port; 1133 sep->se_reset = 1; 1134 } 1135 break; 1136 #endif 1137 } 1138 if (sep->se_reset != 0 && sep->se_fd >= 0) 1139 close_sep(sep); 1140 } else { 1141 rpc = getrpcbyname(sep->se_service); 1142 if (rpc == 0) { 1143 syslog(LOG_ERR, "%s/%s unknown RPC service", 1144 sep->se_service, sep->se_proto); 1145 if (sep->se_fd != -1) 1146 (void) close(sep->se_fd); 1147 sep->se_fd = -1; 1148 continue; 1149 } 1150 if (sep->se_reset != 0 || 1151 rpc->r_number != sep->se_rpc_prog) { 1152 if (sep->se_rpc_prog) 1153 unregisterrpc(sep); 1154 sep->se_rpc_prog = rpc->r_number; 1155 if (sep->se_fd != -1) 1156 (void) close(sep->se_fd); 1157 sep->se_fd = -1; 1158 } 1159 sep->se_nomapped = new_nomapped; 1160 } 1161 sep->se_reset = 0; 1162 if (sep->se_fd == -1) 1163 setup(sep); 1164 } 1165 endconfig(); 1166 /* 1167 * Purge anything not looked at above. 1168 */ 1169 omask = sigblock(SIGBLOCK); 1170 sepp = &servtab; 1171 while ((sep = *sepp)) { 1172 if (sep->se_checked) { 1173 sepp = &sep->se_next; 1174 continue; 1175 } 1176 *sepp = sep->se_next; 1177 if (sep->se_fd >= 0) 1178 close_sep(sep); 1179 if (debug) 1180 print_service("FREE", sep); 1181 if (sep->se_rpc && sep->se_rpc_prog > 0) 1182 unregisterrpc(sep); 1183 freeconfig(sep); 1184 free(sep); 1185 } 1186 (void) sigsetmask(omask); 1187 } 1188 1189 static void 1190 unregisterrpc(struct servtab *sep) 1191 { 1192 u_int i; 1193 struct servtab *sepp; 1194 long omask; 1195 struct netconfig *netid4, *netid6; 1196 1197 omask = sigblock(SIGBLOCK); 1198 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1199 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1200 if (sep->se_family == AF_INET) 1201 netid6 = NULL; 1202 else if (sep->se_nomapped) 1203 netid4 = NULL; 1204 /* 1205 * Conflict if same prog and protocol - In that case one should look 1206 * to versions, but it is not interesting: having separate servers for 1207 * different versions does not work well. 1208 * Therefore one do not unregister if there is a conflict. 1209 * There is also transport conflict if destroying INET when INET46 1210 * exists, or destroying INET46 when INET exists 1211 */ 1212 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1213 if (sepp == sep) 1214 continue; 1215 if (sepp->se_checked == 0 || 1216 !sepp->se_rpc || 1217 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1218 sep->se_rpc_prog != sepp->se_rpc_prog) 1219 continue; 1220 if (sepp->se_family == AF_INET) 1221 netid4 = NULL; 1222 if (sepp->se_family == AF_INET6) { 1223 netid6 = NULL; 1224 if (!sep->se_nomapped) 1225 netid4 = NULL; 1226 } 1227 if (netid4 == NULL && netid6 == NULL) 1228 return; 1229 } 1230 if (debug) 1231 print_service("UNREG", sep); 1232 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1233 if (netid4) 1234 rpcb_unset(sep->se_rpc_prog, i, netid4); 1235 if (netid6) 1236 rpcb_unset(sep->se_rpc_prog, i, netid6); 1237 } 1238 if (sep->se_fd != -1) 1239 (void) close(sep->se_fd); 1240 sep->se_fd = -1; 1241 (void) sigsetmask(omask); 1242 } 1243 1244 static void 1245 retry(void) 1246 { 1247 struct servtab *sep; 1248 1249 timingout = 0; 1250 for (sep = servtab; sep; sep = sep->se_next) 1251 if (sep->se_fd == -1 && !ISMUX(sep)) 1252 setup(sep); 1253 } 1254 1255 static void 1256 setup(struct servtab *sep) 1257 { 1258 int on = 1; 1259 1260 /* Set all listening sockets to close-on-exec. */ 1261 if ((sep->se_fd = socket(sep->se_family, 1262 sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) { 1263 if (debug) 1264 warn("socket failed on %s/%s", 1265 sep->se_service, sep->se_proto); 1266 syslog(LOG_ERR, "%s/%s: socket: %m", 1267 sep->se_service, sep->se_proto); 1268 return; 1269 } 1270 #define turnon(fd, opt) \ 1271 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1272 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1273 turnon(sep->se_fd, SO_DEBUG) < 0) 1274 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1275 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1276 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1277 #ifdef SO_PRIVSTATE 1278 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1279 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1280 #endif 1281 /* tftpd opens a new connection then needs more infos */ 1282 #ifdef INET6 1283 if ((sep->se_family == AF_INET6) && 1284 (strcmp(sep->se_proto, "udp") == 0) && 1285 (sep->se_accept == 0) && 1286 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1287 (char *)&on, sizeof (on)) < 0)) 1288 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1289 if (sep->se_family == AF_INET6) { 1290 int flag = sep->se_nomapped ? 1 : 0; 1291 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1292 (char *)&flag, sizeof (flag)) < 0) 1293 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1294 } 1295 #endif 1296 #undef turnon 1297 #ifdef IPSEC 1298 ipsecsetup(sep); 1299 #endif 1300 if (sep->se_family == AF_UNIX) { 1301 (void) unlink(sep->se_ctrladdr_un.sun_path); 1302 umask(0777); /* Make socket with conservative permissions */ 1303 } 1304 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1305 sep->se_ctrladdr_size) < 0) { 1306 if (debug) 1307 warn("bind failed on %s/%s", 1308 sep->se_service, sep->se_proto); 1309 syslog(LOG_ERR, "%s/%s: bind: %m", 1310 sep->se_service, sep->se_proto); 1311 (void) close(sep->se_fd); 1312 sep->se_fd = -1; 1313 if (!timingout) { 1314 timingout = 1; 1315 alarm(RETRYTIME); 1316 } 1317 if (sep->se_family == AF_UNIX) 1318 umask(mask); 1319 return; 1320 } 1321 if (sep->se_family == AF_UNIX) { 1322 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1323 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1324 syslog(LOG_ERR, "chown socket: %m"); 1325 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1326 syslog(LOG_ERR, "chmod socket: %m"); 1327 umask(mask); 1328 } 1329 if (sep->se_rpc) { 1330 u_int i; 1331 socklen_t len = sep->se_ctrladdr_size; 1332 struct netconfig *netid, *netid2 = NULL; 1333 #ifdef INET6 1334 struct sockaddr_in sock; 1335 #endif 1336 struct netbuf nbuf, nbuf2; 1337 1338 if (getsockname(sep->se_fd, 1339 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1340 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1341 sep->se_service, sep->se_proto); 1342 (void) close(sep->se_fd); 1343 sep->se_fd = -1; 1344 return; 1345 } 1346 nbuf.buf = &sep->se_ctrladdr; 1347 nbuf.len = sep->se_ctrladdr.sa_len; 1348 if (sep->se_family == AF_INET) 1349 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1350 #ifdef INET6 1351 else { 1352 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1353 if (!sep->se_nomapped) { /* INET and INET6 */ 1354 netid2 = netid==udp6conf? udpconf:tcpconf; 1355 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1356 nbuf2.buf = &sock; 1357 nbuf2.len = sock.sin_len = sizeof sock; 1358 sock.sin_family = AF_INET; 1359 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1360 } 1361 } 1362 #else 1363 else { 1364 syslog(LOG_ERR, 1365 "%s/%s: inetd compiled without inet6 support\n", 1366 sep->se_service, sep->se_proto); 1367 (void) close(sep->se_fd); 1368 sep->se_fd = -1; 1369 return; 1370 } 1371 #endif 1372 if (debug) 1373 print_service("REG ", sep); 1374 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1375 rpcb_unset(sep->se_rpc_prog, i, netid); 1376 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1377 if (netid2) { 1378 rpcb_unset(sep->se_rpc_prog, i, netid2); 1379 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1380 } 1381 } 1382 } 1383 if (sep->se_socktype == SOCK_STREAM) 1384 listen(sep->se_fd, -1); 1385 enable(sep); 1386 if (debug) { 1387 warnx("registered %s on %d", 1388 sep->se_server, sep->se_fd); 1389 } 1390 } 1391 1392 #ifdef IPSEC 1393 static void 1394 ipsecsetup(struct servtab *sep) 1395 { 1396 char *buf; 1397 char *policy_in = NULL; 1398 char *policy_out = NULL; 1399 int level; 1400 int opt; 1401 1402 switch (sep->se_family) { 1403 case AF_INET: 1404 level = IPPROTO_IP; 1405 opt = IP_IPSEC_POLICY; 1406 break; 1407 #ifdef INET6 1408 case AF_INET6: 1409 level = IPPROTO_IPV6; 1410 opt = IPV6_IPSEC_POLICY; 1411 break; 1412 #endif 1413 default: 1414 return; 1415 } 1416 1417 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1418 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1419 policy_in = def_in; 1420 policy_out = def_out; 1421 } else { 1422 if (!strncmp("in", sep->se_policy, 2)) 1423 policy_in = sep->se_policy; 1424 else if (!strncmp("out", sep->se_policy, 3)) 1425 policy_out = sep->se_policy; 1426 else { 1427 syslog(LOG_ERR, "invalid security policy \"%s\"", 1428 sep->se_policy); 1429 return; 1430 } 1431 } 1432 1433 if (policy_in != NULL) { 1434 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1435 if (buf != NULL) { 1436 if (setsockopt(sep->se_fd, level, opt, 1437 buf, ipsec_get_policylen(buf)) < 0 && 1438 debug != 0) 1439 warnx("%s/%s: ipsec initialization failed; %s", 1440 sep->se_service, sep->se_proto, 1441 policy_in); 1442 free(buf); 1443 } else 1444 syslog(LOG_ERR, "invalid security policy \"%s\"", 1445 policy_in); 1446 } 1447 if (policy_out != NULL) { 1448 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1449 if (buf != NULL) { 1450 if (setsockopt(sep->se_fd, level, opt, 1451 buf, ipsec_get_policylen(buf)) < 0 && 1452 debug != 0) 1453 warnx("%s/%s: ipsec initialization failed; %s", 1454 sep->se_service, sep->se_proto, 1455 policy_out); 1456 free(buf); 1457 } else 1458 syslog(LOG_ERR, "invalid security policy \"%s\"", 1459 policy_out); 1460 } 1461 } 1462 #endif 1463 1464 /* 1465 * Finish with a service and its socket. 1466 */ 1467 static void 1468 close_sep(struct servtab *sep) 1469 { 1470 if (sep->se_fd >= 0) { 1471 if (FD_ISSET(sep->se_fd, &allsock)) 1472 disable(sep); 1473 (void) close(sep->se_fd); 1474 sep->se_fd = -1; 1475 } 1476 sep->se_count = 0; 1477 sep->se_numchild = 0; /* forget about any existing children */ 1478 } 1479 1480 static int 1481 matchservent(const char *name1, const char *name2, const char *proto) 1482 { 1483 char **alias, *p; 1484 struct servent *se; 1485 1486 if (strcmp(proto, "unix") == 0) { 1487 if ((p = strrchr(name1, '/')) != NULL) 1488 name1 = p + 1; 1489 if ((p = strrchr(name2, '/')) != NULL) 1490 name2 = p + 1; 1491 } 1492 if (strcmp(name1, name2) == 0) 1493 return(1); 1494 if ((se = getservbyname(name1, proto)) != NULL) { 1495 if (strcmp(name2, se->s_name) == 0) 1496 return(1); 1497 for (alias = se->s_aliases; *alias; alias++) 1498 if (strcmp(name2, *alias) == 0) 1499 return(1); 1500 } 1501 return(0); 1502 } 1503 1504 static struct servtab * 1505 enter(struct servtab *cp) 1506 { 1507 struct servtab *sep; 1508 long omask; 1509 1510 sep = malloc(sizeof(*sep)); 1511 if (sep == NULL) { 1512 syslog(LOG_ERR, "malloc: %m"); 1513 exit(EX_OSERR); 1514 } 1515 *sep = *cp; 1516 sep->se_fd = -1; 1517 omask = sigblock(SIGBLOCK); 1518 sep->se_next = servtab; 1519 servtab = sep; 1520 sigsetmask(omask); 1521 return (sep); 1522 } 1523 1524 static void 1525 enable(struct servtab *sep) 1526 { 1527 if (debug) 1528 warnx( 1529 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1530 #ifdef SANITY_CHECK 1531 if (sep->se_fd < 0) { 1532 syslog(LOG_ERR, 1533 "%s: %s: bad fd", __func__, sep->se_service); 1534 exit(EX_SOFTWARE); 1535 } 1536 if (ISMUX(sep)) { 1537 syslog(LOG_ERR, 1538 "%s: %s: is mux", __func__, sep->se_service); 1539 exit(EX_SOFTWARE); 1540 } 1541 if (FD_ISSET(sep->se_fd, &allsock)) { 1542 syslog(LOG_ERR, 1543 "%s: %s: not off", __func__, sep->se_service); 1544 exit(EX_SOFTWARE); 1545 } 1546 nsock++; 1547 #endif 1548 FD_SET(sep->se_fd, &allsock); 1549 maxsock = MAX(maxsock, sep->se_fd); 1550 } 1551 1552 static void 1553 disable(struct servtab *sep) 1554 { 1555 if (debug) 1556 warnx( 1557 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1558 #ifdef SANITY_CHECK 1559 if (sep->se_fd < 0) { 1560 syslog(LOG_ERR, 1561 "%s: %s: bad fd", __func__, sep->se_service); 1562 exit(EX_SOFTWARE); 1563 } 1564 if (ISMUX(sep)) { 1565 syslog(LOG_ERR, 1566 "%s: %s: is mux", __func__, sep->se_service); 1567 exit(EX_SOFTWARE); 1568 } 1569 if (!FD_ISSET(sep->se_fd, &allsock)) { 1570 syslog(LOG_ERR, 1571 "%s: %s: not on", __func__, sep->se_service); 1572 exit(EX_SOFTWARE); 1573 } 1574 if (nsock == 0) { 1575 syslog(LOG_ERR, "%s: nsock=0", __func__); 1576 exit(EX_SOFTWARE); 1577 } 1578 nsock--; 1579 #endif 1580 FD_CLR(sep->se_fd, &allsock); 1581 if (sep->se_fd == maxsock) 1582 maxsock--; 1583 } 1584 1585 static FILE *fconfig = NULL; 1586 static struct servtab serv; 1587 static char line[LINE_MAX]; 1588 1589 static int 1590 setconfig(void) 1591 { 1592 1593 if (fconfig != NULL) { 1594 fseek(fconfig, 0L, SEEK_SET); 1595 return (1); 1596 } 1597 fconfig = fopen(CONFIG, "r"); 1598 return (fconfig != NULL); 1599 } 1600 1601 static void 1602 endconfig(void) 1603 { 1604 if (fconfig) { 1605 (void) fclose(fconfig); 1606 fconfig = NULL; 1607 } 1608 } 1609 1610 static struct servtab * 1611 getconfigent(void) 1612 { 1613 struct servtab *sep = &serv; 1614 int argc; 1615 char *cp, *arg, *s; 1616 char *versp; 1617 static char TCPMUX_TOKEN[] = "tcpmux/"; 1618 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1619 #ifdef IPSEC 1620 char *policy; 1621 #endif 1622 #ifdef INET6 1623 int v4bind; 1624 int v6bind; 1625 #endif 1626 int i; 1627 1628 #ifdef IPSEC 1629 policy = NULL; 1630 #endif 1631 more: 1632 #ifdef INET6 1633 v4bind = 0; 1634 v6bind = 0; 1635 #endif 1636 while ((cp = nextline(fconfig)) != NULL) { 1637 #ifdef IPSEC 1638 /* lines starting with #@ is not a comment, but the policy */ 1639 if (cp[0] == '#' && cp[1] == '@') { 1640 char *p; 1641 for (p = cp + 2; p && *p && isspace(*p); p++) 1642 ; 1643 if (*p == '\0') { 1644 free(policy); 1645 policy = NULL; 1646 } else if (ipsec_get_policylen(p) >= 0) { 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 #ifdef IPSEC 1663 free(policy); 1664 #endif 1665 return (NULL); 1666 } 1667 1668 /* 1669 * clear the static buffer, since some fields (se_ctrladdr, 1670 * for example) don't get initialized here. 1671 */ 1672 memset(sep, 0, sizeof *sep); 1673 arg = skip(&cp); 1674 if (cp == NULL) { 1675 /* got an empty line containing just blanks/tabs. */ 1676 goto more; 1677 } 1678 if (arg[0] == ':') { /* :user:group:perm: */ 1679 char *user, *group, *perm; 1680 struct passwd *pw; 1681 struct group *gr; 1682 user = arg+1; 1683 if ((group = strchr(user, ':')) == NULL) { 1684 syslog(LOG_ERR, "no group after user '%s'", user); 1685 goto more; 1686 } 1687 *group++ = '\0'; 1688 if ((perm = strchr(group, ':')) == NULL) { 1689 syslog(LOG_ERR, "no mode after group '%s'", group); 1690 goto more; 1691 } 1692 *perm++ = '\0'; 1693 if ((pw = getpwnam(user)) == NULL) { 1694 syslog(LOG_ERR, "no such user '%s'", user); 1695 goto more; 1696 } 1697 sep->se_sockuid = pw->pw_uid; 1698 if ((gr = getgrnam(group)) == NULL) { 1699 syslog(LOG_ERR, "no such user '%s'", group); 1700 goto more; 1701 } 1702 sep->se_sockgid = gr->gr_gid; 1703 sep->se_sockmode = strtol(perm, &arg, 8); 1704 if (*arg != ':') { 1705 syslog(LOG_ERR, "bad mode '%s'", perm); 1706 goto more; 1707 } 1708 *arg++ = '\0'; 1709 } else { 1710 sep->se_sockuid = euid; 1711 sep->se_sockgid = egid; 1712 sep->se_sockmode = 0200; 1713 } 1714 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1715 char *c = arg + MUX_LEN; 1716 if (*c == '+') { 1717 sep->se_type = MUXPLUS_TYPE; 1718 c++; 1719 } else 1720 sep->se_type = MUX_TYPE; 1721 sep->se_service = newstr(c); 1722 } else { 1723 sep->se_service = newstr(arg); 1724 sep->se_type = NORM_TYPE; 1725 } 1726 arg = sskip(&cp); 1727 if (strcmp(arg, "stream") == 0) 1728 sep->se_socktype = SOCK_STREAM; 1729 else if (strcmp(arg, "dgram") == 0) 1730 sep->se_socktype = SOCK_DGRAM; 1731 else if (strcmp(arg, "rdm") == 0) 1732 sep->se_socktype = SOCK_RDM; 1733 else if (strcmp(arg, "seqpacket") == 0) 1734 sep->se_socktype = SOCK_SEQPACKET; 1735 else if (strcmp(arg, "raw") == 0) 1736 sep->se_socktype = SOCK_RAW; 1737 else 1738 sep->se_socktype = -1; 1739 1740 arg = sskip(&cp); 1741 if (strncmp(arg, "tcp", 3) == 0) { 1742 sep->se_proto = newstr(strsep(&arg, "/")); 1743 if (arg != NULL && (strcmp(arg, "faith") == 0)) { 1744 syslog(LOG_ERR, "faith has been deprecated"); 1745 goto more; 1746 } 1747 } else { 1748 if (sep->se_type == NORM_TYPE && 1749 strncmp(arg, "faith/", 6) == 0) { 1750 syslog(LOG_ERR, "faith has been deprecated"); 1751 goto more; 1752 } 1753 sep->se_proto = newstr(arg); 1754 } 1755 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1756 memmove(sep->se_proto, sep->se_proto + 4, 1757 strlen(sep->se_proto) + 1 - 4); 1758 sep->se_rpc = 1; 1759 sep->se_rpc_prog = sep->se_rpc_lowvers = 1760 sep->se_rpc_highvers = 0; 1761 if ((versp = strrchr(sep->se_service, '/'))) { 1762 *versp++ = '\0'; 1763 switch (sscanf(versp, "%u-%u", 1764 &sep->se_rpc_lowvers, 1765 &sep->se_rpc_highvers)) { 1766 case 2: 1767 break; 1768 case 1: 1769 sep->se_rpc_highvers = 1770 sep->se_rpc_lowvers; 1771 break; 1772 default: 1773 syslog(LOG_ERR, 1774 "bad RPC version specifier; %s", 1775 sep->se_service); 1776 freeconfig(sep); 1777 goto more; 1778 } 1779 } 1780 else { 1781 sep->se_rpc_lowvers = 1782 sep->se_rpc_highvers = 1; 1783 } 1784 } 1785 sep->se_nomapped = 0; 1786 if (strcmp(sep->se_proto, "unix") == 0) { 1787 sep->se_family = AF_UNIX; 1788 } else { 1789 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1790 #ifdef INET6 1791 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1792 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1793 v6bind = 1; 1794 continue; 1795 } 1796 #endif 1797 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1798 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1799 #ifdef INET6 1800 v4bind = 1; 1801 #endif 1802 continue; 1803 } 1804 /* illegal version num */ 1805 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1806 freeconfig(sep); 1807 goto more; 1808 } 1809 #ifdef INET6 1810 if (v6bind && !v6bind_ok) { 1811 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1812 sep->se_service); 1813 if (v4bind && v4bind_ok) 1814 v6bind = 0; 1815 else { 1816 freeconfig(sep); 1817 goto more; 1818 } 1819 } 1820 if (v6bind) { 1821 sep->se_family = AF_INET6; 1822 if (!v4bind || !v4bind_ok) 1823 sep->se_nomapped = 1; 1824 } else 1825 #endif 1826 { /* default to v4 bind if not v6 bind */ 1827 if (!v4bind_ok) { 1828 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1829 sep->se_service); 1830 freeconfig(sep); 1831 goto more; 1832 } 1833 sep->se_family = AF_INET; 1834 } 1835 } 1836 /* init ctladdr */ 1837 switch(sep->se_family) { 1838 case AF_INET: 1839 memcpy(&sep->se_ctrladdr4, bind_sa4, 1840 sizeof(sep->se_ctrladdr4)); 1841 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1842 break; 1843 #ifdef INET6 1844 case AF_INET6: 1845 memcpy(&sep->se_ctrladdr6, bind_sa6, 1846 sizeof(sep->se_ctrladdr6)); 1847 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1848 break; 1849 #endif 1850 case AF_UNIX: 1851 #define SUN_PATH_MAXSIZE sizeof(sep->se_ctrladdr_un.sun_path) 1852 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1853 sep->se_ctrladdr_un.sun_family = sep->se_family; 1854 if (strlcpy(sep->se_ctrladdr_un.sun_path, sep->se_service, 1855 SUN_PATH_MAXSIZE) >= SUN_PATH_MAXSIZE) { 1856 syslog(LOG_ERR, 1857 "domain socket pathname too long for service %s", 1858 sep->se_service); 1859 goto more; 1860 } 1861 #undef SUN_PATH_MAXSIZE 1862 sep->se_ctrladdr_size = sep->se_ctrladdr_un.sun_len = 1863 SUN_LEN(&sep->se_ctrladdr_un); 1864 } 1865 arg = sskip(&cp); 1866 if (!strncmp(arg, "wait", 4)) 1867 sep->se_accept = 0; 1868 else if (!strncmp(arg, "nowait", 6)) 1869 sep->se_accept = 1; 1870 else { 1871 syslog(LOG_ERR, 1872 "%s: bad wait/nowait for service %s", 1873 CONFIG, sep->se_service); 1874 goto more; 1875 } 1876 sep->se_maxchild = -1; 1877 sep->se_maxcpm = -1; 1878 sep->se_maxperip = -1; 1879 if ((s = strchr(arg, '/')) != NULL) { 1880 char *eptr; 1881 u_long val; 1882 1883 val = strtoul(s + 1, &eptr, 10); 1884 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1885 syslog(LOG_ERR, 1886 "%s: bad max-child for service %s", 1887 CONFIG, sep->se_service); 1888 goto more; 1889 } 1890 if (debug) 1891 if (!sep->se_accept && val != 1) 1892 warnx("maxchild=%lu for wait service %s" 1893 " not recommended", val, sep->se_service); 1894 sep->se_maxchild = val; 1895 if (*eptr == '/') 1896 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1897 if (*eptr == '/') 1898 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1899 /* 1900 * explicitly do not check for \0 for future expansion / 1901 * backwards compatibility 1902 */ 1903 } 1904 if (ISMUX(sep)) { 1905 /* 1906 * Silently enforce "nowait" mode for TCPMUX services 1907 * since they don't have an assigned port to listen on. 1908 */ 1909 sep->se_accept = 1; 1910 if (strcmp(sep->se_proto, "tcp")) { 1911 syslog(LOG_ERR, 1912 "%s: bad protocol for tcpmux service %s", 1913 CONFIG, sep->se_service); 1914 goto more; 1915 } 1916 if (sep->se_socktype != SOCK_STREAM) { 1917 syslog(LOG_ERR, 1918 "%s: bad socket type for tcpmux service %s", 1919 CONFIG, sep->se_service); 1920 goto more; 1921 } 1922 } 1923 sep->se_user = newstr(sskip(&cp)); 1924 #ifdef LOGIN_CAP 1925 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1926 *s = '\0'; 1927 sep->se_class = newstr(s + 1); 1928 } else 1929 sep->se_class = newstr(RESOURCE_RC); 1930 #endif 1931 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1932 *s = '\0'; 1933 sep->se_group = newstr(s + 1); 1934 } else 1935 sep->se_group = NULL; 1936 sep->se_server = newstr(sskip(&cp)); 1937 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1938 sep->se_server_name++; 1939 if (strcmp(sep->se_server, "internal") == 0) { 1940 struct biltin *bi; 1941 1942 for (bi = biltins; bi->bi_service; bi++) 1943 if (bi->bi_socktype == sep->se_socktype && 1944 matchservent(bi->bi_service, sep->se_service, 1945 sep->se_proto)) 1946 break; 1947 if (bi->bi_service == 0) { 1948 syslog(LOG_ERR, "internal service %s unknown", 1949 sep->se_service); 1950 goto more; 1951 } 1952 sep->se_accept = 1; /* force accept mode for built-ins */ 1953 sep->se_bi = bi; 1954 } else 1955 sep->se_bi = NULL; 1956 if (sep->se_maxperip < 0) 1957 sep->se_maxperip = maxperip; 1958 if (sep->se_maxcpm < 0) 1959 sep->se_maxcpm = maxcpm; 1960 if (sep->se_maxchild < 0) { /* apply default max-children */ 1961 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1962 sep->se_maxchild = sep->se_bi->bi_maxchild; 1963 else if (sep->se_accept) 1964 sep->se_maxchild = MAX(maxchild, 0); 1965 else 1966 sep->se_maxchild = 1; 1967 } 1968 LIST_INIT(&sep->se_children); 1969 argc = 0; 1970 for (arg = skip(&cp); cp; arg = skip(&cp)) 1971 if (argc < MAXARGV) { 1972 sep->se_argv[argc++] = newstr(arg); 1973 } else { 1974 syslog(LOG_ERR, 1975 "%s: too many arguments for service %s", 1976 CONFIG, sep->se_service); 1977 goto more; 1978 } 1979 while (argc <= MAXARGV) 1980 sep->se_argv[argc++] = NULL; 1981 for (i = 0; i < PERIPSIZE; ++i) 1982 LIST_INIT(&sep->se_conn[i]); 1983 #ifdef IPSEC 1984 sep->se_policy = policy ? newstr(policy) : NULL; 1985 free(policy); 1986 #endif 1987 return (sep); 1988 } 1989 1990 static void 1991 freeconfig(struct servtab *cp) 1992 { 1993 struct stabchild *sc; 1994 int i; 1995 1996 free(cp->se_service); 1997 free(cp->se_proto); 1998 free(cp->se_user); 1999 free(cp->se_group); 2000 #ifdef LOGIN_CAP 2001 free(cp->se_class); 2002 #endif 2003 free(cp->se_server); 2004 while (!LIST_EMPTY(&cp->se_children)) { 2005 sc = LIST_FIRST(&cp->se_children); 2006 LIST_REMOVE(sc, sc_link); 2007 free(sc); 2008 } 2009 for (i = 0; i < MAXARGV; i++) 2010 if (cp->se_argv[i]) 2011 free(cp->se_argv[i]); 2012 free_connlist(cp); 2013 #ifdef IPSEC 2014 free(cp->se_policy); 2015 #endif 2016 } 2017 2018 2019 /* 2020 * Safe skip - if skip returns null, log a syntax error in the 2021 * configuration file and exit. 2022 */ 2023 static char * 2024 sskip(char **cpp) 2025 { 2026 char *cp; 2027 2028 cp = skip(cpp); 2029 if (cp == NULL) { 2030 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2031 exit(EX_DATAERR); 2032 } 2033 return (cp); 2034 } 2035 2036 static char * 2037 skip(char **cpp) 2038 { 2039 char *cp = *cpp; 2040 char *start; 2041 char quote = '\0'; 2042 2043 again: 2044 while (*cp == ' ' || *cp == '\t') 2045 cp++; 2046 if (*cp == '\0') { 2047 int c; 2048 2049 c = getc(fconfig); 2050 (void) ungetc(c, fconfig); 2051 if (c == ' ' || c == '\t') 2052 if ((cp = nextline(fconfig))) 2053 goto again; 2054 *cpp = (char *)0; 2055 return ((char *)0); 2056 } 2057 if (*cp == '"' || *cp == '\'') 2058 quote = *cp++; 2059 start = cp; 2060 if (quote) 2061 while (*cp && *cp != quote) 2062 cp++; 2063 else 2064 while (*cp && *cp != ' ' && *cp != '\t') 2065 cp++; 2066 if (*cp != '\0') 2067 *cp++ = '\0'; 2068 *cpp = cp; 2069 return (start); 2070 } 2071 2072 static char * 2073 nextline(FILE *fd) 2074 { 2075 char *cp; 2076 2077 if (fgets(line, sizeof (line), fd) == NULL) 2078 return ((char *)0); 2079 cp = strchr(line, '\n'); 2080 if (cp) 2081 *cp = '\0'; 2082 return (line); 2083 } 2084 2085 static char * 2086 newstr(const char *cp) 2087 { 2088 char *cr; 2089 2090 if ((cr = strdup(cp != NULL ? cp : ""))) 2091 return (cr); 2092 syslog(LOG_ERR, "strdup: %m"); 2093 exit(EX_OSERR); 2094 } 2095 2096 void 2097 inetd_setproctitle(const char *a, int s) 2098 { 2099 socklen_t size; 2100 struct sockaddr_storage ss; 2101 char buf[80], pbuf[NI_MAXHOST]; 2102 2103 size = sizeof(ss); 2104 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2105 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2106 NULL, 0, NI_NUMERICHOST); 2107 (void) sprintf(buf, "%s [%s]", a, pbuf); 2108 } else 2109 (void) sprintf(buf, "%s", a); 2110 setproctitle("%s", buf); 2111 } 2112 2113 int 2114 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2115 { 2116 struct servtab *se2; 2117 char pname[NI_MAXHOST]; 2118 2119 for (se2 = servtab; se2; se2 = se2->se_next) { 2120 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2121 continue; 2122 2123 switch (se2->se_family) { 2124 case AF_INET: 2125 if (csatosin(sa)->sin_port == 2126 se2->se_ctrladdr4.sin_port) 2127 goto isloop; 2128 continue; 2129 #ifdef INET6 2130 case AF_INET6: 2131 if (csatosin6(sa)->sin6_port == 2132 se2->se_ctrladdr6.sin6_port) 2133 goto isloop; 2134 continue; 2135 #endif 2136 default: 2137 continue; 2138 } 2139 isloop: 2140 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2141 NI_NUMERICHOST); 2142 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2143 sep->se_service, sep->se_proto, 2144 se2->se_service, se2->se_proto, 2145 pname); 2146 return 1; 2147 } 2148 return 0; 2149 } 2150 2151 /* 2152 * print_service: 2153 * Dump relevant information to stderr 2154 */ 2155 static void 2156 print_service(const char *action, const struct servtab *sep) 2157 { 2158 fprintf(stderr, 2159 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2160 #ifdef LOGIN_CAP 2161 "class=%s" 2162 #endif 2163 " builtin=%p server=%s" 2164 #ifdef IPSEC 2165 " policy=\"%s\"" 2166 #endif 2167 "\n", 2168 action, sep->se_service, sep->se_proto, 2169 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2170 #ifdef LOGIN_CAP 2171 sep->se_class, 2172 #endif 2173 (void *) sep->se_bi, sep->se_server 2174 #ifdef IPSEC 2175 , (sep->se_policy ? sep->se_policy : "") 2176 #endif 2177 ); 2178 } 2179 2180 #define CPMHSIZE 256 2181 #define CPMHMASK (CPMHSIZE-1) 2182 #define CHTGRAN 10 2183 #define CHTSIZE 6 2184 2185 typedef struct CTime { 2186 unsigned long ct_Ticks; 2187 int ct_Count; 2188 } CTime; 2189 2190 typedef struct CHash { 2191 union { 2192 struct in_addr c4_Addr; 2193 struct in6_addr c6_Addr; 2194 } cu_Addr; 2195 #define ch_Addr4 cu_Addr.c4_Addr 2196 #define ch_Addr6 cu_Addr.c6_Addr 2197 int ch_Family; 2198 time_t ch_LTime; 2199 char *ch_Service; 2200 CTime ch_Times[CHTSIZE]; 2201 } CHash; 2202 2203 static CHash CHashAry[CPMHSIZE]; 2204 2205 static int 2206 cpmip(const struct servtab *sep, int ctrl) 2207 { 2208 struct sockaddr_storage rss; 2209 socklen_t rssLen = sizeof(rss); 2210 int r = 0; 2211 2212 /* 2213 * If getpeername() fails, just let it through (if logging is 2214 * enabled the condition is caught elsewhere) 2215 */ 2216 2217 if (sep->se_maxcpm > 0 && 2218 (sep->se_family == AF_INET || sep->se_family == AF_INET6) && 2219 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2220 time_t t = time(NULL); 2221 unsigned int hv = 0xABC3D20F; 2222 int i; 2223 int cnt = 0; 2224 CHash *chBest = NULL; 2225 unsigned int ticks = t / CHTGRAN; 2226 struct sockaddr_in *sin4; 2227 #ifdef INET6 2228 struct sockaddr_in6 *sin6; 2229 #endif 2230 2231 sin4 = (struct sockaddr_in *)&rss; 2232 #ifdef INET6 2233 sin6 = (struct sockaddr_in6 *)&rss; 2234 #endif 2235 { 2236 char *p; 2237 int addrlen; 2238 2239 switch (rss.ss_family) { 2240 case AF_INET: 2241 p = (char *)&sin4->sin_addr; 2242 addrlen = sizeof(struct in_addr); 2243 break; 2244 #ifdef INET6 2245 case AF_INET6: 2246 p = (char *)&sin6->sin6_addr; 2247 addrlen = sizeof(struct in6_addr); 2248 break; 2249 #endif 2250 default: 2251 /* should not happen */ 2252 return -1; 2253 } 2254 2255 for (i = 0; i < addrlen; ++i, ++p) { 2256 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2257 } 2258 hv = (hv ^ (hv >> 16)); 2259 } 2260 for (i = 0; i < 5; ++i) { 2261 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2262 2263 if (rss.ss_family == AF_INET && 2264 ch->ch_Family == AF_INET && 2265 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2266 ch->ch_Service && strcmp(sep->se_service, 2267 ch->ch_Service) == 0) { 2268 chBest = ch; 2269 break; 2270 } 2271 #ifdef INET6 2272 if (rss.ss_family == AF_INET6 && 2273 ch->ch_Family == AF_INET6 && 2274 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2275 &ch->ch_Addr6) != 0 && 2276 ch->ch_Service && strcmp(sep->se_service, 2277 ch->ch_Service) == 0) { 2278 chBest = ch; 2279 break; 2280 } 2281 #endif 2282 if (chBest == NULL || ch->ch_LTime == 0 || 2283 ch->ch_LTime < chBest->ch_LTime) { 2284 chBest = ch; 2285 } 2286 } 2287 if ((rss.ss_family == AF_INET && 2288 (chBest->ch_Family != AF_INET || 2289 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2290 chBest->ch_Service == NULL || 2291 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2292 chBest->ch_Family = sin4->sin_family; 2293 chBest->ch_Addr4 = sin4->sin_addr; 2294 free(chBest->ch_Service); 2295 chBest->ch_Service = strdup(sep->se_service); 2296 memset(chBest->ch_Times, 0, 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 free(chBest->ch_Service); 2308 chBest->ch_Service = strdup(sep->se_service); 2309 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times)); 2310 } 2311 #endif 2312 chBest->ch_LTime = t; 2313 { 2314 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2315 if (ct->ct_Ticks != ticks) { 2316 ct->ct_Ticks = ticks; 2317 ct->ct_Count = 0; 2318 } 2319 ++ct->ct_Count; 2320 } 2321 for (i = 0; i < CHTSIZE; ++i) { 2322 CTime *ct = &chBest->ch_Times[i]; 2323 if (ct->ct_Ticks <= ticks && 2324 ct->ct_Ticks >= ticks - CHTSIZE) { 2325 cnt += ct->ct_Count; 2326 } 2327 } 2328 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2329 char pname[NI_MAXHOST]; 2330 2331 getnameinfo((struct sockaddr *)&rss, 2332 ((struct sockaddr *)&rss)->sa_len, 2333 pname, sizeof(pname), NULL, 0, 2334 NI_NUMERICHOST); 2335 r = -1; 2336 syslog(LOG_ERR, 2337 "%s from %s exceeded counts/min (limit %d/min)", 2338 sep->se_service, pname, 2339 sep->se_maxcpm); 2340 } 2341 } 2342 return(r); 2343 } 2344 2345 static struct conninfo * 2346 search_conn(struct servtab *sep, int ctrl) 2347 { 2348 struct sockaddr_storage ss; 2349 socklen_t sslen = sizeof(ss); 2350 struct conninfo *conn; 2351 int hv; 2352 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2353 2354 if (sep->se_maxperip <= 0) 2355 return NULL; 2356 2357 /* 2358 * If getpeername() fails, just let it through (if logging is 2359 * enabled the condition is caught elsewhere) 2360 */ 2361 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2362 return NULL; 2363 2364 switch (ss.ss_family) { 2365 case AF_INET: 2366 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2367 sizeof(struct in_addr)); 2368 break; 2369 #ifdef INET6 2370 case AF_INET6: 2371 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2372 sizeof(struct in6_addr)); 2373 break; 2374 #endif 2375 default: 2376 /* 2377 * Since we only support AF_INET and AF_INET6, just 2378 * let other than AF_INET and AF_INET6 through. 2379 */ 2380 return NULL; 2381 } 2382 2383 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2384 NULL, 0, NI_NUMERICHOST) != 0) 2385 return NULL; 2386 2387 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2388 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2389 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2390 NI_NUMERICHOST) == 0 && 2391 strcmp(pname, pname2) == 0) 2392 break; 2393 } 2394 2395 if (conn == NULL) { 2396 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2397 syslog(LOG_ERR, "malloc: %m"); 2398 exit(EX_OSERR); 2399 } 2400 conn->co_proc = reallocarray(NULL, sep->se_maxperip, 2401 sizeof(*conn->co_proc)); 2402 if (conn->co_proc == NULL) { 2403 syslog(LOG_ERR, "reallocarray: %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 2420 static int 2421 room_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 2436 static void 2437 addchild_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 2456 static void 2457 reapchild_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 2476 static void 2477 resize_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 = reallocarray(conn->co_proc, maxpip, 2493 sizeof(*conn->co_proc)); 2494 if (conn->co_proc == NULL) { 2495 syslog(LOG_ERR, "reallocarray: %m"); 2496 exit(EX_OSERR); 2497 } 2498 if (conn->co_numchild > maxpip) 2499 conn->co_numchild = maxpip; 2500 } 2501 } 2502 } 2503 2504 static void 2505 free_connlist(struct servtab *sep) 2506 { 2507 struct conninfo *conn, *conn_temp; 2508 int i, j; 2509 2510 for (i = 0; i < PERIPSIZE; ++i) { 2511 LIST_FOREACH_SAFE(conn, &sep->se_conn[i], co_link, conn_temp) { 2512 if (conn == NULL) { 2513 LIST_REMOVE(conn, co_link); 2514 continue; 2515 } 2516 for (j = 0; j < conn->co_numchild; ++j) 2517 free_proc(conn->co_proc[j]); 2518 conn->co_numchild = 0; 2519 free_conn(conn); 2520 } 2521 } 2522 } 2523 2524 static void 2525 free_conn(struct conninfo *conn) 2526 { 2527 if (conn == NULL) 2528 return; 2529 if (conn->co_numchild <= 0) { 2530 LIST_REMOVE(conn, co_link); 2531 free(conn->co_proc); 2532 free(conn); 2533 } 2534 } 2535 2536 static struct procinfo * 2537 search_proc(pid_t pid, int add) 2538 { 2539 struct procinfo *proc; 2540 int hv; 2541 2542 hv = hashval((char *)&pid, sizeof(pid)); 2543 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2544 if (proc->pr_pid == pid) 2545 break; 2546 } 2547 if (proc == NULL && add) { 2548 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2549 syslog(LOG_ERR, "malloc: %m"); 2550 exit(EX_OSERR); 2551 } 2552 proc->pr_pid = pid; 2553 proc->pr_conn = NULL; 2554 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2555 } 2556 return proc; 2557 } 2558 2559 static void 2560 free_proc(struct procinfo *proc) 2561 { 2562 if (proc == NULL) 2563 return; 2564 LIST_REMOVE(proc, pr_link); 2565 free(proc); 2566 } 2567 2568 static int 2569 hashval(char *p, int len) 2570 { 2571 unsigned int hv = 0xABC3D20F; 2572 int i; 2573 2574 for (i = 0; i < len; ++i, ++p) 2575 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2576 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2577 return hv; 2578 } 2579