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 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; 41 #endif 42 #endif /* not lint */ 43 44 /* 45 * Inetd - Internet super-server 46 * 47 * This program invokes all internet services as needed. Connection-oriented 48 * services are invoked each time a connection is made, by creating a process. 49 * This process is passed the connection as file descriptor 0 and is expected 50 * to do a getpeername to find out the source host and port. 51 * 52 * Datagram oriented services are invoked when a datagram 53 * arrives; a process is created and passed a pending message 54 * on file descriptor 0. Datagram servers may either connect 55 * to their peer, freeing up the original socket for inetd 56 * to receive further messages on, or ``take over the socket'', 57 * processing all arriving datagrams and, eventually, timing 58 * out. The first type of server is said to be ``multi-threaded''; 59 * the second type of server ``single-threaded''. 60 * 61 * Inetd uses a configuration file which is read at startup 62 * and, possibly, at some later time in response to a hangup signal. 63 * The configuration file is ``free format'' with fields given in the 64 * order shown below. Continuation lines for an entry must begin with 65 * a space or tab. All fields must be present in each entry. 66 * 67 * service name must be in /etc/services 68 * or name a tcpmux service 69 * or specify a unix domain socket 70 * socket type stream/dgram/raw/rdm/seqpacket 71 * protocol tcp[4][6], udp[4][6], unix 72 * wait/nowait single-threaded/multi-threaded 73 * user[:group][/login-class] user/group/login-class to run daemon as 74 * server program full path name 75 * server program arguments maximum of MAXARGS (20) 76 * 77 * TCP services without official port numbers are handled with the 78 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 79 * requests. When a connection is made from a foreign host, the service 80 * requested is passed to tcpmux, which looks it up in the servtab list 81 * and returns the proper entry for the service. Tcpmux returns a 82 * negative reply if the service doesn't exist, otherwise the invoked 83 * server is expected to return the positive reply if the service type in 84 * inetd.conf file has the prefix "tcpmux/". If the service type has the 85 * prefix "tcpmux/+", tcpmux will return the positive reply for the 86 * process; this is for compatibility with older server code, and also 87 * allows you to invoke programs that use stdin/stdout without putting any 88 * special server code in them. Services that use tcpmux are "nowait" 89 * because they do not have a well-known port and hence cannot listen 90 * for new requests. 91 * 92 * For RPC services 93 * service name/version must be in /etc/rpc 94 * socket type stream/dgram/raw/rdm/seqpacket 95 * protocol rpc/tcp[4][6], rpc/udp[4][6] 96 * wait/nowait single-threaded/multi-threaded 97 * user[:group][/login-class] user/group/login-class to run daemon as 98 * server program full path name 99 * server program arguments maximum of MAXARGS 100 * 101 * Comment lines are indicated by a `#' in column 1. 102 * 103 * #ifdef IPSEC 104 * Comment lines that start with "#@" denote IPsec policy string, as described 105 * in ipsec_set_policy(3). This will affect all the following items in 106 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 107 * there's no IPsec policy. 108 * #endif 109 */ 110 #include <sys/param.h> 111 #include <sys/ioctl.h> 112 #include <sys/mman.h> 113 #include <sys/wait.h> 114 #include <sys/time.h> 115 #include <sys/resource.h> 116 #include <sys/stat.h> 117 #include <sys/un.h> 118 119 #include <netinet/in.h> 120 #include <netinet/tcp.h> 121 #include <arpa/inet.h> 122 #include <rpc/rpc.h> 123 #include <rpc/pmap_clnt.h> 124 125 #include <ctype.h> 126 #include <errno.h> 127 #include <err.h> 128 #include <fcntl.h> 129 #include <grp.h> 130 #include <libutil.h> 131 #include <limits.h> 132 #include <netdb.h> 133 #include <pwd.h> 134 #include <signal.h> 135 #include <stdio.h> 136 #include <stdlib.h> 137 #include <string.h> 138 #include <sysexits.h> 139 #include <syslog.h> 140 #ifdef LIBWRAP 141 #include <tcpd.h> 142 #endif 143 #include <unistd.h> 144 145 #include "inetd.h" 146 #include "pathnames.h" 147 148 #ifdef IPSEC 149 #include <netipsec/ipsec.h> 150 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 151 #undef IPSEC 152 #endif 153 #endif 154 155 #ifndef LIBWRAP_ALLOW_FACILITY 156 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 157 #endif 158 #ifndef LIBWRAP_ALLOW_SEVERITY 159 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 160 #endif 161 #ifndef LIBWRAP_DENY_FACILITY 162 # define LIBWRAP_DENY_FACILITY LOG_AUTH 163 #endif 164 #ifndef LIBWRAP_DENY_SEVERITY 165 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 166 #endif 167 168 #define ISWRAP(sep) \ 169 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 170 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 171 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 172 || (sep)->se_socktype == SOCK_DGRAM)) 173 174 #ifdef LOGIN_CAP 175 #include <login_cap.h> 176 177 /* see init.c */ 178 #define RESOURCE_RC "daemon" 179 180 #endif 181 182 #ifndef MAXCHILD 183 #define MAXCHILD -1 /* maximum number of this service 184 < 0 = no limit */ 185 #endif 186 187 #ifndef MAXCPM 188 #define MAXCPM -1 /* rate limit invocations from a 189 single remote address, 190 < 0 = no limit */ 191 #endif 192 193 #ifndef MAXPERIP 194 #define MAXPERIP -1 /* maximum number of this service 195 from a single remote address, 196 < 0 = no limit */ 197 #endif 198 199 #ifndef TOOMANY 200 #define TOOMANY 256 /* don't start more than TOOMANY */ 201 #endif 202 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 203 #define RETRYTIME (60*10) /* retry after bind or server fail */ 204 #define MAX_MAXCHLD 32767 /* max allowable max children */ 205 206 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 207 208 #define satosin(sa) ((struct sockaddr_in *)(void *)sa) 209 #define csatosin(sa) ((const struct sockaddr_in *)(const void *)sa) 210 #ifdef INET6 211 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)sa) 212 #define csatosin6(sa) ((const struct sockaddr_in6 *)(const void *)sa) 213 #endif 214 static void close_sep(struct servtab *); 215 static void flag_signal(int); 216 static void config(void); 217 static int cpmip(const struct servtab *, int); 218 static void endconfig(void); 219 static struct servtab *enter(struct servtab *); 220 static void freeconfig(struct servtab *); 221 static struct servtab *getconfigent(void); 222 static int matchservent(const char *, const char *, const char *); 223 static char *nextline(FILE *); 224 static void addchild(struct servtab *, int); 225 static void reapchild(void); 226 static void enable(struct servtab *); 227 static void disable(struct servtab *); 228 static void retry(void); 229 static int setconfig(void); 230 static void setup(struct servtab *); 231 #ifdef IPSEC 232 static void ipsecsetup(struct servtab *); 233 #endif 234 static void unregisterrpc(register struct servtab *sep); 235 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 236 static int room_conn(struct servtab *sep, struct conninfo *conn); 237 static void addchild_conn(struct conninfo *conn, pid_t pid); 238 static void reapchild_conn(pid_t pid); 239 static void free_conn(struct conninfo *conn); 240 static void resize_conn(struct servtab *sep, int maxperip); 241 static void free_connlist(struct servtab *sep); 242 static void free_proc(struct procinfo *); 243 static struct procinfo *search_proc(pid_t pid, int add); 244 static int hashval(char *p, int len); 245 static char *skip(char **); 246 static char *sskip(char **); 247 static char *newstr(const char *); 248 static void print_service(const char *, const struct servtab *); 249 250 #ifdef LIBWRAP 251 /* tcpd.h */ 252 int allow_severity; 253 int deny_severity; 254 #endif 255 256 static int wrap_ex = 0; 257 static int wrap_bi = 0; 258 int debug = 0; 259 static int dolog = 0; 260 static int maxsock; /* highest-numbered descriptor */ 261 static fd_set allsock; 262 static int options; 263 static int timingout; 264 static int toomany = TOOMANY; 265 static int maxchild = MAXCHILD; 266 static int maxcpm = MAXCPM; 267 static int maxperip = MAXPERIP; 268 static struct servent *sp; 269 static struct rpcent *rpc; 270 static char *hostname = NULL; 271 static struct sockaddr_in *bind_sa4; 272 static int v4bind_ok = 0; 273 #ifdef INET6 274 static struct sockaddr_in6 *bind_sa6; 275 static int v6bind_ok = 0; 276 #endif 277 static int signalpipe[2]; 278 #ifdef SANITY_CHECK 279 static int nsock; 280 #endif 281 static uid_t euid; 282 static gid_t egid; 283 static mode_t mask; 284 285 struct servtab *servtab; 286 287 static const char *CONFIG = _PATH_INETDCONF; 288 static const char *pid_file = _PATH_INETDPID; 289 static struct pidfh *pfh = NULL; 290 291 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 292 293 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 294 295 static int 296 getvalue(const char *arg, int *value, const char *whine) 297 { 298 int tmp; 299 char *p; 300 301 tmp = strtol(arg, &p, 0); 302 if (tmp < 0 || *p) { 303 syslog(LOG_ERR, whine, arg); 304 return 1; /* failure */ 305 } 306 *value = tmp; 307 return 0; /* success */ 308 } 309 310 #ifdef LIBWRAP 311 static sa_family_t 312 whichaf(struct request_info *req) 313 { 314 struct sockaddr *sa; 315 316 sa = (struct sockaddr *)req->client->sin; 317 if (sa == NULL) 318 return AF_UNSPEC; 319 #ifdef INET6 320 if (sa->sa_family == AF_INET6 && 321 IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr)) 322 return AF_INET; 323 #endif 324 return sa->sa_family; 325 } 326 #endif 327 328 int 329 main(int argc, char **argv) 330 { 331 struct servtab *sep; 332 struct passwd *pwd; 333 struct group *grp; 334 struct sigaction sa, saalrm, sachld, sahup, sapipe; 335 int ch, dofork; 336 pid_t pid; 337 char buf[50]; 338 #ifdef LOGIN_CAP 339 login_cap_t *lc = NULL; 340 #endif 341 #ifdef LIBWRAP 342 struct request_info req; 343 int denied; 344 char *service = NULL; 345 #endif 346 struct sockaddr_storage peer; 347 int i; 348 struct addrinfo hints, *res; 349 const char *servname; 350 int error; 351 struct conninfo *conn; 352 353 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 354 355 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 356 switch(ch) { 357 case 'd': 358 debug = 1; 359 options |= SO_DEBUG; 360 break; 361 case 'l': 362 dolog = 1; 363 break; 364 case 'R': 365 getvalue(optarg, &toomany, 366 "-R %s: bad value for service invocation rate"); 367 break; 368 case 'c': 369 getvalue(optarg, &maxchild, 370 "-c %s: bad value for maximum children"); 371 break; 372 case 'C': 373 getvalue(optarg, &maxcpm, 374 "-C %s: bad value for maximum children/minute"); 375 break; 376 case 'a': 377 hostname = optarg; 378 break; 379 case 'p': 380 pid_file = optarg; 381 break; 382 case 's': 383 getvalue(optarg, &maxperip, 384 "-s %s: bad value for maximum children per source address"); 385 break; 386 case 'w': 387 wrap_ex++; 388 break; 389 case 'W': 390 wrap_bi++; 391 break; 392 case '?': 393 default: 394 syslog(LOG_ERR, 395 "usage: inetd [-dlWw] [-a address] [-C rate]" 396 " [-c maximum] [-p filename] [-R rate]" 397 " [-s maximum] [configuration_file]"); 398 exit(EX_USAGE); 399 } 400 /* 401 * Initialize Bind Addrs. 402 * When hostname is NULL, wild card bind addrs are obtained from 403 * getaddrinfo(). But getaddrinfo() requires at least one of 404 * hostname or servname is non NULL. 405 * So when hostname is NULL, set dummy value to servname. 406 * Since getaddrinfo() doesn't accept numeric servname, and 407 * we doesn't use ai_socktype of struct addrinfo returned 408 * from getaddrinfo(), we set dummy value to ai_socktype. 409 */ 410 servname = (hostname == NULL) ? "0" /* dummy */ : NULL; 411 412 memset(&hints, 0, sizeof(struct addrinfo)); 413 hints.ai_flags = AI_PASSIVE; 414 hints.ai_family = AF_UNSPEC; 415 hints.ai_socktype = SOCK_STREAM; /* dummy */ 416 error = getaddrinfo(hostname, servname, &hints, &res); 417 if (error != 0) { 418 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 419 if (error == EAI_SYSTEM) 420 syslog(LOG_ERR, "%s", strerror(errno)); 421 exit(EX_USAGE); 422 } 423 do { 424 if (res->ai_addr == NULL) { 425 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 426 exit(EX_USAGE); 427 } 428 switch (res->ai_addr->sa_family) { 429 case AF_INET: 430 if (v4bind_ok) 431 continue; 432 bind_sa4 = satosin(res->ai_addr); 433 /* init port num in case servname is dummy */ 434 bind_sa4->sin_port = 0; 435 v4bind_ok = 1; 436 continue; 437 #ifdef INET6 438 case AF_INET6: 439 if (v6bind_ok) 440 continue; 441 bind_sa6 = satosin6(res->ai_addr); 442 /* init port num in case servname is dummy */ 443 bind_sa6->sin6_port = 0; 444 v6bind_ok = 1; 445 continue; 446 #endif 447 } 448 if (v4bind_ok 449 #ifdef INET6 450 && v6bind_ok 451 #endif 452 ) 453 break; 454 } while ((res = res->ai_next) != NULL); 455 if (!v4bind_ok 456 #ifdef INET6 457 && !v6bind_ok 458 #endif 459 ) { 460 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 461 exit(EX_USAGE); 462 } 463 464 euid = geteuid(); 465 egid = getegid(); 466 umask(mask = umask(0777)); 467 468 argc -= optind; 469 argv += optind; 470 471 if (argc > 0) 472 CONFIG = argv[0]; 473 if (access(CONFIG, R_OK) < 0) 474 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG); 475 if (debug == 0) { 476 pid_t otherpid; 477 478 pfh = pidfile_open(pid_file, 0600, &otherpid); 479 if (pfh == NULL) { 480 if (errno == EEXIST) { 481 syslog(LOG_ERR, "%s already running, pid: %d", 482 getprogname(), otherpid); 483 exit(EX_OSERR); 484 } 485 syslog(LOG_WARNING, "pidfile_open() failed: %m"); 486 } 487 488 if (daemon(0, 0) < 0) { 489 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 490 } 491 /* From now on we don't want syslog messages going to stderr. */ 492 closelog(); 493 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 494 /* 495 * In case somebody has started inetd manually, we need to 496 * clear the logname, so that old servers run as root do not 497 * get the user's logname.. 498 */ 499 if (setlogin("") < 0) { 500 syslog(LOG_WARNING, "cannot clear logname: %m"); 501 /* no big deal if it fails.. */ 502 } 503 if (pfh != NULL && pidfile_write(pfh) == -1) { 504 syslog(LOG_WARNING, "pidfile_write(): %m"); 505 } 506 } 507 508 if (madvise(NULL, 0, MADV_PROTECT) != 0) 509 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno)); 510 511 for (i = 0; i < PERIPSIZE; ++i) 512 LIST_INIT(&proctable[i]); 513 514 if (v4bind_ok) { 515 udpconf = getnetconfigent("udp"); 516 tcpconf = getnetconfigent("tcp"); 517 if (udpconf == NULL || tcpconf == NULL) { 518 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 519 exit(EX_USAGE); 520 } 521 } 522 #ifdef INET6 523 if (v6bind_ok) { 524 udp6conf = getnetconfigent("udp6"); 525 tcp6conf = getnetconfigent("tcp6"); 526 if (udp6conf == NULL || tcp6conf == NULL) { 527 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 528 exit(EX_USAGE); 529 } 530 } 531 #endif 532 533 sa = (struct sigaction){ 534 .sa_flags = 0, 535 .sa_handler = flag_signal, 536 }; 537 sigemptyset(&sa.sa_mask); 538 sigaddset(&sa.sa_mask, SIGALRM); 539 sigaddset(&sa.sa_mask, SIGCHLD); 540 sigaddset(&sa.sa_mask, SIGHUP); 541 sigaction(SIGALRM, &sa, &saalrm); 542 config(); 543 sigaction(SIGHUP, &sa, &sahup); 544 sigaction(SIGCHLD, &sa, &sachld); 545 sa.sa_handler = SIG_IGN; 546 sigaction(SIGPIPE, &sa, &sapipe); 547 548 { 549 /* space for daemons to overwrite environment for ps */ 550 #define DUMMYSIZE 100 551 char dummy[DUMMYSIZE]; 552 553 (void)memset(dummy, 'x', DUMMYSIZE - 1); 554 dummy[DUMMYSIZE - 1] = '\0'; 555 (void)setenv("inetd_dummy", dummy, 1); 556 } 557 558 if (pipe2(signalpipe, O_CLOEXEC) != 0) { 559 syslog(LOG_ERR, "pipe: %m"); 560 exit(EX_OSERR); 561 } 562 FD_SET(signalpipe[0], &allsock); 563 #ifdef SANITY_CHECK 564 nsock++; 565 #endif 566 maxsock = MAX(MAX(maxsock, signalpipe[0]), signalpipe[1]); 567 568 for (;;) { 569 int n, ctrl; 570 fd_set readable; 571 572 #ifdef SANITY_CHECK 573 if (nsock == 0) { 574 syslog(LOG_ERR, "%s: nsock=0", __func__); 575 exit(EX_SOFTWARE); 576 } 577 #endif 578 readable = allsock; 579 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 580 (fd_set *)0, (struct timeval *)0)) <= 0) { 581 if (n < 0 && errno != EINTR) { 582 syslog(LOG_WARNING, "select: %m"); 583 sleep(1); 584 } 585 continue; 586 } 587 /* handle any queued signal flags */ 588 if (FD_ISSET(signalpipe[0], &readable)) { 589 int nsig, signo; 590 591 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 592 syslog(LOG_ERR, "ioctl: %m"); 593 exit(EX_OSERR); 594 } 595 nsig /= sizeof(signo); 596 while (--nsig >= 0) { 597 size_t len; 598 599 len = read(signalpipe[0], &signo, sizeof(signo)); 600 if (len != sizeof(signo)) { 601 syslog(LOG_ERR, "read: %m"); 602 exit(EX_OSERR); 603 } 604 if (debug) 605 warnx("handling signal flag %d", signo); 606 switch (signo) { 607 case SIGALRM: 608 retry(); 609 break; 610 case SIGCHLD: 611 reapchild(); 612 break; 613 case SIGHUP: 614 config(); 615 break; 616 } 617 } 618 } 619 for (sep = servtab; n && sep; sep = sep->se_next) 620 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 621 n--; 622 if (debug) 623 warnx("someone wants %s", sep->se_service); 624 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 625 conn = NULL; 626 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 627 i = 1; 628 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 629 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 630 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 631 (socklen_t *)0); 632 if (debug) 633 warnx("accept, ctrl %d", ctrl); 634 if (ctrl < 0) { 635 if (errno != EINTR) 636 syslog(LOG_WARNING, 637 "accept (for %s): %m", 638 sep->se_service); 639 if (sep->se_accept && 640 sep->se_socktype == SOCK_STREAM) 641 close(ctrl); 642 continue; 643 } 644 i = 0; 645 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 646 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 647 if (ioctl(ctrl, FIONBIO, &i) < 0) 648 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 649 if (cpmip(sep, ctrl) < 0) { 650 close(ctrl); 651 continue; 652 } 653 if (dofork && 654 (conn = search_conn(sep, ctrl)) != NULL && 655 !room_conn(sep, conn)) { 656 close(ctrl); 657 continue; 658 } 659 } else 660 ctrl = sep->se_fd; 661 if (dolog && !ISWRAP(sep)) { 662 char pname[NI_MAXHOST] = "unknown"; 663 socklen_t sl; 664 sl = sizeof(peer); 665 if (getpeername(ctrl, (struct sockaddr *) 666 &peer, &sl)) { 667 sl = sizeof(peer); 668 if (recvfrom(ctrl, buf, sizeof(buf), 669 MSG_PEEK, 670 (struct sockaddr *)&peer, 671 &sl) >= 0) { 672 getnameinfo((struct sockaddr *)&peer, 673 peer.ss_len, 674 pname, sizeof(pname), 675 NULL, 0, NI_NUMERICHOST); 676 } 677 } else { 678 getnameinfo((struct sockaddr *)&peer, 679 peer.ss_len, 680 pname, sizeof(pname), 681 NULL, 0, NI_NUMERICHOST); 682 } 683 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 684 } 685 (void) sigblock(SIGBLOCK); 686 pid = 0; 687 /* 688 * Fork for all external services, builtins which need to 689 * fork and anything we're wrapping (as wrapping might 690 * block or use hosts_options(5) twist). 691 */ 692 if (dofork) { 693 if (sep->se_count++ == 0) 694 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time); 695 else if (toomany > 0 && sep->se_count >= toomany) { 696 struct timespec now; 697 698 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now); 699 if (now.tv_sec - sep->se_time.tv_sec > 700 CNT_INTVL) { 701 sep->se_time = now; 702 sep->se_count = 1; 703 } else { 704 syslog(LOG_ERR, 705 "%s/%s server failing (looping), service terminated", 706 sep->se_service, sep->se_proto); 707 if (sep->se_accept && 708 sep->se_socktype == SOCK_STREAM) 709 close(ctrl); 710 close_sep(sep); 711 free_conn(conn); 712 sigsetmask(0L); 713 if (!timingout) { 714 timingout = 1; 715 alarm(RETRYTIME); 716 } 717 continue; 718 } 719 } 720 pid = fork(); 721 } 722 if (pid < 0) { 723 syslog(LOG_ERR, "fork: %m"); 724 if (sep->se_accept && 725 sep->se_socktype == SOCK_STREAM) 726 close(ctrl); 727 free_conn(conn); 728 sigsetmask(0L); 729 sleep(1); 730 continue; 731 } 732 if (pid) { 733 addchild_conn(conn, pid); 734 addchild(sep, pid); 735 } 736 sigsetmask(0L); 737 if (pid == 0) { 738 pidfile_close(pfh); 739 if (dofork) { 740 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 741 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 742 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 743 /* SIGPIPE reset before exec */ 744 } 745 /* 746 * Call tcpmux to find the real service to exec. 747 */ 748 if (sep->se_bi && 749 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 750 sep = tcpmux(ctrl); 751 if (sep == NULL) { 752 close(ctrl); 753 _exit(0); 754 } 755 } 756 #ifdef LIBWRAP 757 if (ISWRAP(sep)) { 758 inetd_setproctitle("wrapping", ctrl); 759 service = sep->se_server_name ? 760 sep->se_server_name : sep->se_service; 761 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0); 762 fromhost(&req); 763 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 764 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 765 denied = !hosts_access(&req); 766 if (denied) { 767 syslog(deny_severity, 768 "refused connection from %.500s, service %s (%s%s)", 769 eval_client(&req), service, sep->se_proto, 770 (whichaf(&req) == AF_INET6) ? "6" : ""); 771 if (sep->se_socktype != SOCK_STREAM) 772 recv(ctrl, buf, sizeof (buf), 0); 773 if (dofork) { 774 sleep(1); 775 _exit(0); 776 } 777 } 778 if (dolog) { 779 syslog(allow_severity, 780 "connection from %.500s, service %s (%s%s)", 781 eval_client(&req), service, sep->se_proto, 782 (whichaf(&req) == AF_INET6) ? "6" : ""); 783 } 784 } 785 #endif 786 if (sep->se_bi) { 787 (*sep->se_bi->bi_fn)(ctrl, sep); 788 } else { 789 if (debug) 790 warnx("%d execl %s", 791 getpid(), sep->se_server); 792 /* Clear close-on-exec. */ 793 if (fcntl(ctrl, F_SETFD, 0) < 0) { 794 syslog(LOG_ERR, 795 "%s/%s: fcntl (F_SETFD, 0): %m", 796 sep->se_service, sep->se_proto); 797 _exit(EX_OSERR); 798 } 799 if (ctrl != 0) { 800 dup2(ctrl, 0); 801 close(ctrl); 802 } 803 dup2(0, 1); 804 dup2(0, 2); 805 if ((pwd = getpwnam(sep->se_user)) == NULL) { 806 syslog(LOG_ERR, 807 "%s/%s: %s: no such user", 808 sep->se_service, sep->se_proto, 809 sep->se_user); 810 if (sep->se_socktype != SOCK_STREAM) 811 recv(0, buf, sizeof (buf), 0); 812 _exit(EX_NOUSER); 813 } 814 grp = NULL; 815 if ( sep->se_group != NULL 816 && (grp = getgrnam(sep->se_group)) == NULL 817 ) { 818 syslog(LOG_ERR, 819 "%s/%s: %s: no such group", 820 sep->se_service, sep->se_proto, 821 sep->se_group); 822 if (sep->se_socktype != SOCK_STREAM) 823 recv(0, buf, sizeof (buf), 0); 824 _exit(EX_NOUSER); 825 } 826 if (grp != NULL) 827 pwd->pw_gid = grp->gr_gid; 828 #ifdef LOGIN_CAP 829 if ((lc = login_getclass(sep->se_class)) == NULL) { 830 /* error syslogged by getclass */ 831 syslog(LOG_ERR, 832 "%s/%s: %s: login class error", 833 sep->se_service, sep->se_proto, 834 sep->se_class); 835 if (sep->se_socktype != SOCK_STREAM) 836 recv(0, buf, sizeof (buf), 0); 837 _exit(EX_NOUSER); 838 } 839 #endif 840 if (setsid() < 0) { 841 syslog(LOG_ERR, 842 "%s: can't setsid(): %m", 843 sep->se_service); 844 /* _exit(EX_OSERR); not fatal yet */ 845 } 846 #ifdef LOGIN_CAP 847 if (setusercontext(lc, pwd, pwd->pw_uid, 848 LOGIN_SETALL & ~LOGIN_SETMAC) 849 != 0) { 850 syslog(LOG_ERR, 851 "%s: can't setusercontext(..%s..): %m", 852 sep->se_service, sep->se_user); 853 _exit(EX_OSERR); 854 } 855 login_close(lc); 856 #else 857 if (pwd->pw_uid) { 858 if (setlogin(sep->se_user) < 0) { 859 syslog(LOG_ERR, 860 "%s: can't setlogin(%s): %m", 861 sep->se_service, sep->se_user); 862 /* _exit(EX_OSERR); not yet */ 863 } 864 if (setgid(pwd->pw_gid) < 0) { 865 syslog(LOG_ERR, 866 "%s: can't set gid %d: %m", 867 sep->se_service, pwd->pw_gid); 868 _exit(EX_OSERR); 869 } 870 (void) initgroups(pwd->pw_name, 871 pwd->pw_gid); 872 if (setuid(pwd->pw_uid) < 0) { 873 syslog(LOG_ERR, 874 "%s: can't set uid %d: %m", 875 sep->se_service, pwd->pw_uid); 876 _exit(EX_OSERR); 877 } 878 } 879 #endif 880 sigaction(SIGPIPE, &sapipe, 881 (struct sigaction *)0); 882 execv(sep->se_server, sep->se_argv); 883 syslog(LOG_ERR, 884 "cannot execute %s: %m", sep->se_server); 885 if (sep->se_socktype != SOCK_STREAM) 886 recv(0, buf, sizeof (buf), 0); 887 } 888 if (dofork) 889 _exit(0); 890 } 891 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 892 close(ctrl); 893 } 894 } 895 } 896 897 /* 898 * Add a signal flag to the signal flag queue for later handling 899 */ 900 901 static void 902 flag_signal(int signo) 903 { 904 size_t len; 905 906 len = write(signalpipe[1], &signo, sizeof(signo)); 907 if (len != sizeof(signo)) { 908 syslog(LOG_ERR, "write: %m"); 909 _exit(EX_OSERR); 910 } 911 } 912 913 /* 914 * Record a new child pid for this service. If we've reached the 915 * limit on children, then stop accepting incoming requests. 916 */ 917 918 static void 919 addchild(struct servtab *sep, pid_t pid) 920 { 921 struct stabchild *sc; 922 923 #ifdef SANITY_CHECK 924 if (SERVTAB_EXCEEDS_LIMIT(sep)) { 925 syslog(LOG_ERR, "%s: %d >= %d", 926 __func__, sep->se_numchild, sep->se_maxchild); 927 exit(EX_SOFTWARE); 928 } 929 #endif 930 sc = calloc(1, sizeof(*sc)); 931 if (sc == NULL) { 932 syslog(LOG_ERR, "calloc: %m"); 933 exit(EX_OSERR); 934 } 935 sc->sc_pid = pid; 936 LIST_INSERT_HEAD(&sep->se_children, sc, sc_link); 937 ++sep->se_numchild; 938 if (SERVTAB_AT_LIMIT(sep)) 939 disable(sep); 940 } 941 942 static void 943 reapchild(void) 944 { 945 int status; 946 pid_t pid; 947 struct stabchild *sc; 948 struct servtab *sep; 949 950 for (;;) { 951 pid = wait3(&status, WNOHANG, (struct rusage *)0); 952 if (pid <= 0) 953 break; 954 if (debug) 955 warnx("%d reaped, %s %u", pid, 956 WIFEXITED(status) ? "status" : "signal", 957 WIFEXITED(status) ? WEXITSTATUS(status) 958 : WTERMSIG(status)); 959 for (sep = servtab; sep; sep = sep->se_next) { 960 LIST_FOREACH(sc, &sep->se_children, sc_link) { 961 if (sc->sc_pid == pid) 962 break; 963 } 964 if (sc == NULL) 965 continue; 966 if (SERVTAB_AT_LIMIT(sep)) 967 enable(sep); 968 LIST_REMOVE(sc, sc_link); 969 free(sc); 970 --sep->se_numchild; 971 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 972 syslog(LOG_WARNING, 973 "%s[%d]: exited, %s %u", 974 sep->se_server, pid, 975 WIFEXITED(status) ? "status" : "signal", 976 WIFEXITED(status) ? WEXITSTATUS(status) 977 : WTERMSIG(status)); 978 break; 979 } 980 reapchild_conn(pid); 981 } 982 } 983 984 static void 985 config(void) 986 { 987 struct servtab *sep, *new, **sepp; 988 long omask; 989 int new_nomapped; 990 #ifdef LOGIN_CAP 991 login_cap_t *lc = NULL; 992 #endif 993 994 if (!setconfig()) { 995 syslog(LOG_ERR, "%s: %m", CONFIG); 996 return; 997 } 998 for (sep = servtab; sep; sep = sep->se_next) 999 sep->se_checked = 0; 1000 while ((new = getconfigent())) { 1001 if (getpwnam(new->se_user) == NULL) { 1002 syslog(LOG_ERR, 1003 "%s/%s: no such user '%s', service ignored", 1004 new->se_service, new->se_proto, new->se_user); 1005 continue; 1006 } 1007 if (new->se_group && getgrnam(new->se_group) == NULL) { 1008 syslog(LOG_ERR, 1009 "%s/%s: no such group '%s', service ignored", 1010 new->se_service, new->se_proto, new->se_group); 1011 continue; 1012 } 1013 #ifdef LOGIN_CAP 1014 if ((lc = login_getclass(new->se_class)) == NULL) { 1015 /* error syslogged by getclass */ 1016 syslog(LOG_ERR, 1017 "%s/%s: %s: login class error, service ignored", 1018 new->se_service, new->se_proto, new->se_class); 1019 continue; 1020 } 1021 login_close(lc); 1022 #endif 1023 new_nomapped = new->se_nomapped; 1024 for (sep = servtab; sep; sep = sep->se_next) 1025 if (strcmp(sep->se_service, new->se_service) == 0 && 1026 strcmp(sep->se_proto, new->se_proto) == 0 && 1027 sep->se_rpc == new->se_rpc && 1028 sep->se_socktype == new->se_socktype && 1029 sep->se_family == new->se_family) 1030 break; 1031 if (sep != 0) { 1032 int i; 1033 1034 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 1035 omask = sigblock(SIGBLOCK); 1036 if (sep->se_nomapped != new->se_nomapped) { 1037 /* for rpc keep old nommaped till unregister */ 1038 if (!sep->se_rpc) 1039 sep->se_nomapped = new->se_nomapped; 1040 sep->se_reset = 1; 1041 } 1042 1043 /* 1044 * The children tracked remain; we want numchild to 1045 * still reflect how many jobs are running so we don't 1046 * throw off our accounting. 1047 */ 1048 sep->se_maxcpm = new->se_maxcpm; 1049 sep->se_maxchild = new->se_maxchild; 1050 resize_conn(sep, new->se_maxperip); 1051 sep->se_maxperip = new->se_maxperip; 1052 sep->se_bi = new->se_bi; 1053 /* might need to turn on or off service now */ 1054 if (sep->se_fd >= 0) { 1055 if (SERVTAB_EXCEEDS_LIMIT(sep)) { 1056 if (FD_ISSET(sep->se_fd, &allsock)) 1057 disable(sep); 1058 } else { 1059 if (!FD_ISSET(sep->se_fd, &allsock)) 1060 enable(sep); 1061 } 1062 } 1063 sep->se_accept = new->se_accept; 1064 SWAP(char *, sep->se_user, new->se_user); 1065 SWAP(char *, sep->se_group, new->se_group); 1066 #ifdef LOGIN_CAP 1067 SWAP(char *, sep->se_class, new->se_class); 1068 #endif 1069 SWAP(char *, sep->se_server, new->se_server); 1070 SWAP(char *, sep->se_server_name, new->se_server_name); 1071 for (i = 0; i < MAXARGV; i++) 1072 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1073 #ifdef IPSEC 1074 SWAP(char *, sep->se_policy, new->se_policy); 1075 ipsecsetup(sep); 1076 #endif 1077 sigsetmask(omask); 1078 freeconfig(new); 1079 if (debug) 1080 print_service("REDO", sep); 1081 } else { 1082 sep = enter(new); 1083 if (debug) 1084 print_service("ADD ", sep); 1085 } 1086 sep->se_checked = 1; 1087 if (ISMUX(sep)) { 1088 sep->se_fd = -1; 1089 continue; 1090 } 1091 switch (sep->se_family) { 1092 case AF_INET: 1093 if (!v4bind_ok) { 1094 sep->se_fd = -1; 1095 continue; 1096 } 1097 break; 1098 #ifdef INET6 1099 case AF_INET6: 1100 if (!v6bind_ok) { 1101 sep->se_fd = -1; 1102 continue; 1103 } 1104 break; 1105 #endif 1106 } 1107 if (!sep->se_rpc) { 1108 if (sep->se_family != AF_UNIX) { 1109 sp = getservbyname(sep->se_service, sep->se_proto); 1110 if (sp == 0) { 1111 syslog(LOG_ERR, "%s/%s: unknown service", 1112 sep->se_service, sep->se_proto); 1113 sep->se_checked = 0; 1114 continue; 1115 } 1116 } 1117 switch (sep->se_family) { 1118 case AF_INET: 1119 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1120 sep->se_ctrladdr4.sin_port = 1121 sp->s_port; 1122 sep->se_reset = 1; 1123 } 1124 break; 1125 #ifdef INET6 1126 case AF_INET6: 1127 if (sp->s_port != 1128 sep->se_ctrladdr6.sin6_port) { 1129 sep->se_ctrladdr6.sin6_port = 1130 sp->s_port; 1131 sep->se_reset = 1; 1132 } 1133 break; 1134 #endif 1135 } 1136 if (sep->se_reset != 0 && sep->se_fd >= 0) 1137 close_sep(sep); 1138 } else { 1139 rpc = getrpcbyname(sep->se_service); 1140 if (rpc == 0) { 1141 syslog(LOG_ERR, "%s/%s unknown RPC service", 1142 sep->se_service, sep->se_proto); 1143 if (sep->se_fd != -1) 1144 (void) close(sep->se_fd); 1145 sep->se_fd = -1; 1146 continue; 1147 } 1148 if (sep->se_reset != 0 || 1149 rpc->r_number != sep->se_rpc_prog) { 1150 if (sep->se_rpc_prog) 1151 unregisterrpc(sep); 1152 sep->se_rpc_prog = rpc->r_number; 1153 if (sep->se_fd != -1) 1154 (void) close(sep->se_fd); 1155 sep->se_fd = -1; 1156 } 1157 sep->se_nomapped = new_nomapped; 1158 } 1159 sep->se_reset = 0; 1160 if (sep->se_fd == -1) 1161 setup(sep); 1162 } 1163 endconfig(); 1164 /* 1165 * Purge anything not looked at above. 1166 */ 1167 omask = sigblock(SIGBLOCK); 1168 sepp = &servtab; 1169 while ((sep = *sepp)) { 1170 if (sep->se_checked) { 1171 sepp = &sep->se_next; 1172 continue; 1173 } 1174 *sepp = sep->se_next; 1175 if (sep->se_fd >= 0) 1176 close_sep(sep); 1177 if (debug) 1178 print_service("FREE", sep); 1179 if (sep->se_rpc && sep->se_rpc_prog > 0) 1180 unregisterrpc(sep); 1181 freeconfig(sep); 1182 free(sep); 1183 } 1184 (void) sigsetmask(omask); 1185 } 1186 1187 static void 1188 unregisterrpc(struct servtab *sep) 1189 { 1190 u_int i; 1191 struct servtab *sepp; 1192 long omask; 1193 struct netconfig *netid4, *netid6; 1194 1195 omask = sigblock(SIGBLOCK); 1196 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1197 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1198 if (sep->se_family == AF_INET) 1199 netid6 = NULL; 1200 else if (sep->se_nomapped) 1201 netid4 = NULL; 1202 /* 1203 * Conflict if same prog and protocol - In that case one should look 1204 * to versions, but it is not interesting: having separate servers for 1205 * different versions does not work well. 1206 * Therefore one do not unregister if there is a conflict. 1207 * There is also transport conflict if destroying INET when INET46 1208 * exists, or destroying INET46 when INET exists 1209 */ 1210 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1211 if (sepp == sep) 1212 continue; 1213 if (sepp->se_checked == 0 || 1214 !sepp->se_rpc || 1215 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1216 sep->se_rpc_prog != sepp->se_rpc_prog) 1217 continue; 1218 if (sepp->se_family == AF_INET) 1219 netid4 = NULL; 1220 if (sepp->se_family == AF_INET6) { 1221 netid6 = NULL; 1222 if (!sep->se_nomapped) 1223 netid4 = NULL; 1224 } 1225 if (netid4 == NULL && netid6 == NULL) 1226 return; 1227 } 1228 if (debug) 1229 print_service("UNREG", sep); 1230 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1231 if (netid4) 1232 rpcb_unset(sep->se_rpc_prog, i, netid4); 1233 if (netid6) 1234 rpcb_unset(sep->se_rpc_prog, i, netid6); 1235 } 1236 if (sep->se_fd != -1) 1237 (void) close(sep->se_fd); 1238 sep->se_fd = -1; 1239 (void) sigsetmask(omask); 1240 } 1241 1242 static void 1243 retry(void) 1244 { 1245 struct servtab *sep; 1246 1247 timingout = 0; 1248 for (sep = servtab; sep; sep = sep->se_next) 1249 if (sep->se_fd == -1 && !ISMUX(sep)) 1250 setup(sep); 1251 } 1252 1253 static void 1254 setup(struct servtab *sep) 1255 { 1256 int on = 1; 1257 1258 /* Set all listening sockets to close-on-exec. */ 1259 if ((sep->se_fd = socket(sep->se_family, 1260 sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) { 1261 if (debug) 1262 warn("socket failed on %s/%s", 1263 sep->se_service, sep->se_proto); 1264 syslog(LOG_ERR, "%s/%s: socket: %m", 1265 sep->se_service, sep->se_proto); 1266 return; 1267 } 1268 #define turnon(fd, opt) \ 1269 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1270 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1271 turnon(sep->se_fd, SO_DEBUG) < 0) 1272 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1273 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1274 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1275 #ifdef SO_PRIVSTATE 1276 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1277 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1278 #endif 1279 /* tftpd opens a new connection then needs more infos */ 1280 #ifdef INET6 1281 if ((sep->se_family == AF_INET6) && 1282 (strcmp(sep->se_proto, "udp") == 0) && 1283 (sep->se_accept == 0) && 1284 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1285 (char *)&on, sizeof (on)) < 0)) 1286 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1287 if (sep->se_family == AF_INET6) { 1288 int flag = sep->se_nomapped ? 1 : 0; 1289 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1290 (char *)&flag, sizeof (flag)) < 0) 1291 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1292 } 1293 #endif 1294 #undef turnon 1295 #ifdef IPSEC 1296 ipsecsetup(sep); 1297 #endif 1298 if (sep->se_family == AF_UNIX) { 1299 (void) unlink(sep->se_ctrladdr_un.sun_path); 1300 umask(0777); /* Make socket with conservative permissions */ 1301 } 1302 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1303 sep->se_ctrladdr_size) < 0) { 1304 if (debug) 1305 warn("bind failed on %s/%s", 1306 sep->se_service, sep->se_proto); 1307 syslog(LOG_ERR, "%s/%s: bind: %m", 1308 sep->se_service, sep->se_proto); 1309 (void) close(sep->se_fd); 1310 sep->se_fd = -1; 1311 if (!timingout) { 1312 timingout = 1; 1313 alarm(RETRYTIME); 1314 } 1315 if (sep->se_family == AF_UNIX) 1316 umask(mask); 1317 return; 1318 } 1319 if (sep->se_family == AF_UNIX) { 1320 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1321 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1322 syslog(LOG_ERR, "chown socket: %m"); 1323 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1324 syslog(LOG_ERR, "chmod socket: %m"); 1325 umask(mask); 1326 } 1327 if (sep->se_rpc) { 1328 u_int i; 1329 socklen_t len = sep->se_ctrladdr_size; 1330 struct netconfig *netid, *netid2 = NULL; 1331 #ifdef INET6 1332 struct sockaddr_in sock; 1333 #endif 1334 struct netbuf nbuf, nbuf2; 1335 1336 if (getsockname(sep->se_fd, 1337 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1338 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1339 sep->se_service, sep->se_proto); 1340 (void) close(sep->se_fd); 1341 sep->se_fd = -1; 1342 return; 1343 } 1344 nbuf.buf = &sep->se_ctrladdr; 1345 nbuf.len = sep->se_ctrladdr.sa_len; 1346 if (sep->se_family == AF_INET) 1347 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1348 #ifdef INET6 1349 else { 1350 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1351 if (!sep->se_nomapped) { /* INET and INET6 */ 1352 netid2 = netid==udp6conf? udpconf:tcpconf; 1353 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1354 nbuf2.buf = &sock; 1355 nbuf2.len = sock.sin_len = sizeof sock; 1356 sock.sin_family = AF_INET; 1357 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1358 } 1359 } 1360 #else 1361 else { 1362 syslog(LOG_ERR, 1363 "%s/%s: inetd compiled without inet6 support\n", 1364 sep->se_service, sep->se_proto); 1365 (void) close(sep->se_fd); 1366 sep->se_fd = -1; 1367 return; 1368 } 1369 #endif 1370 if (debug) 1371 print_service("REG ", sep); 1372 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1373 rpcb_unset(sep->se_rpc_prog, i, netid); 1374 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1375 if (netid2) { 1376 rpcb_unset(sep->se_rpc_prog, i, netid2); 1377 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1378 } 1379 } 1380 } 1381 if (sep->se_socktype == SOCK_STREAM) 1382 listen(sep->se_fd, -1); 1383 enable(sep); 1384 if (debug) { 1385 warnx("registered %s on %d", 1386 sep->se_server, sep->se_fd); 1387 } 1388 } 1389 1390 #ifdef IPSEC 1391 static void 1392 ipsecsetup(struct servtab *sep) 1393 { 1394 char *buf; 1395 char *policy_in = NULL; 1396 char *policy_out = NULL; 1397 int level; 1398 int opt; 1399 1400 switch (sep->se_family) { 1401 case AF_INET: 1402 level = IPPROTO_IP; 1403 opt = IP_IPSEC_POLICY; 1404 break; 1405 #ifdef INET6 1406 case AF_INET6: 1407 level = IPPROTO_IPV6; 1408 opt = IPV6_IPSEC_POLICY; 1409 break; 1410 #endif 1411 default: 1412 return; 1413 } 1414 1415 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1416 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1417 policy_in = def_in; 1418 policy_out = def_out; 1419 } else { 1420 if (!strncmp("in", sep->se_policy, 2)) 1421 policy_in = sep->se_policy; 1422 else if (!strncmp("out", sep->se_policy, 3)) 1423 policy_out = sep->se_policy; 1424 else { 1425 syslog(LOG_ERR, "invalid security policy \"%s\"", 1426 sep->se_policy); 1427 return; 1428 } 1429 } 1430 1431 if (policy_in != NULL) { 1432 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1433 if (buf != NULL) { 1434 if (setsockopt(sep->se_fd, level, opt, 1435 buf, ipsec_get_policylen(buf)) < 0 && 1436 debug != 0) 1437 warnx("%s/%s: ipsec initialization failed; %s", 1438 sep->se_service, sep->se_proto, 1439 policy_in); 1440 free(buf); 1441 } else 1442 syslog(LOG_ERR, "invalid security policy \"%s\"", 1443 policy_in); 1444 } 1445 if (policy_out != NULL) { 1446 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1447 if (buf != NULL) { 1448 if (setsockopt(sep->se_fd, level, opt, 1449 buf, ipsec_get_policylen(buf)) < 0 && 1450 debug != 0) 1451 warnx("%s/%s: ipsec initialization failed; %s", 1452 sep->se_service, sep->se_proto, 1453 policy_out); 1454 free(buf); 1455 } else 1456 syslog(LOG_ERR, "invalid security policy \"%s\"", 1457 policy_out); 1458 } 1459 } 1460 #endif 1461 1462 /* 1463 * Finish with a service and its socket. 1464 */ 1465 static void 1466 close_sep(struct servtab *sep) 1467 { 1468 if (sep->se_fd >= 0) { 1469 if (FD_ISSET(sep->se_fd, &allsock)) 1470 disable(sep); 1471 (void) close(sep->se_fd); 1472 sep->se_fd = -1; 1473 } 1474 sep->se_count = 0; 1475 sep->se_numchild = 0; /* forget about any existing children */ 1476 } 1477 1478 static int 1479 matchservent(const char *name1, const char *name2, const char *proto) 1480 { 1481 char **alias, *p; 1482 struct servent *se; 1483 1484 if (strcmp(proto, "unix") == 0) { 1485 if ((p = strrchr(name1, '/')) != NULL) 1486 name1 = p + 1; 1487 if ((p = strrchr(name2, '/')) != NULL) 1488 name2 = p + 1; 1489 } 1490 if (strcmp(name1, name2) == 0) 1491 return(1); 1492 if ((se = getservbyname(name1, proto)) != NULL) { 1493 if (strcmp(name2, se->s_name) == 0) 1494 return(1); 1495 for (alias = se->s_aliases; *alias; alias++) 1496 if (strcmp(name2, *alias) == 0) 1497 return(1); 1498 } 1499 return(0); 1500 } 1501 1502 static struct servtab * 1503 enter(struct servtab *cp) 1504 { 1505 struct servtab *sep; 1506 long omask; 1507 1508 sep = malloc(sizeof(*sep)); 1509 if (sep == NULL) { 1510 syslog(LOG_ERR, "malloc: %m"); 1511 exit(EX_OSERR); 1512 } 1513 *sep = *cp; 1514 sep->se_fd = -1; 1515 omask = sigblock(SIGBLOCK); 1516 sep->se_next = servtab; 1517 servtab = sep; 1518 sigsetmask(omask); 1519 return (sep); 1520 } 1521 1522 static void 1523 enable(struct servtab *sep) 1524 { 1525 if (debug) 1526 warnx( 1527 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1528 #ifdef SANITY_CHECK 1529 if (sep->se_fd < 0) { 1530 syslog(LOG_ERR, 1531 "%s: %s: bad fd", __func__, sep->se_service); 1532 exit(EX_SOFTWARE); 1533 } 1534 if (ISMUX(sep)) { 1535 syslog(LOG_ERR, 1536 "%s: %s: is mux", __func__, sep->se_service); 1537 exit(EX_SOFTWARE); 1538 } 1539 if (FD_ISSET(sep->se_fd, &allsock)) { 1540 syslog(LOG_ERR, 1541 "%s: %s: not off", __func__, sep->se_service); 1542 exit(EX_SOFTWARE); 1543 } 1544 nsock++; 1545 #endif 1546 FD_SET(sep->se_fd, &allsock); 1547 maxsock = MAX(maxsock, sep->se_fd); 1548 } 1549 1550 static void 1551 disable(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 1583 static FILE *fconfig = NULL; 1584 static struct servtab serv; 1585 static char line[LINE_MAX]; 1586 1587 static int 1588 setconfig(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 1599 static void 1600 endconfig(void) 1601 { 1602 if (fconfig) { 1603 (void) fclose(fconfig); 1604 fconfig = NULL; 1605 } 1606 } 1607 1608 static struct servtab * 1609 getconfigent(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 #ifdef INET6 1621 int v4bind; 1622 int v6bind; 1623 #endif 1624 int i; 1625 1626 #ifdef IPSEC 1627 policy = NULL; 1628 #endif 1629 more: 1630 #ifdef INET6 1631 v4bind = 0; 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 free(policy); 1643 policy = NULL; 1644 } else if (ipsec_get_policylen(p) >= 0) { 1645 free(policy); 1646 policy = newstr(p); 1647 } else { 1648 syslog(LOG_ERR, 1649 "%s: invalid ipsec policy \"%s\"", 1650 CONFIG, p); 1651 exit(EX_CONFIG); 1652 } 1653 } 1654 #endif 1655 if (*cp == '#' || *cp == '\0') 1656 continue; 1657 break; 1658 } 1659 if (cp == NULL) { 1660 #ifdef IPSEC 1661 free(policy); 1662 #endif 1663 return (NULL); 1664 } 1665 1666 /* 1667 * clear the static buffer, since some fields (se_ctrladdr, 1668 * for example) don't get initialized here. 1669 */ 1670 memset(sep, 0, sizeof *sep); 1671 arg = skip(&cp); 1672 if (cp == NULL) { 1673 /* got an empty line containing just blanks/tabs. */ 1674 goto more; 1675 } 1676 if (arg[0] == ':') { /* :user:group:perm: */ 1677 char *user, *group, *perm; 1678 struct passwd *pw; 1679 struct group *gr; 1680 user = arg+1; 1681 if ((group = strchr(user, ':')) == NULL) { 1682 syslog(LOG_ERR, "no group after user '%s'", user); 1683 goto more; 1684 } 1685 *group++ = '\0'; 1686 if ((perm = strchr(group, ':')) == NULL) { 1687 syslog(LOG_ERR, "no mode after group '%s'", group); 1688 goto more; 1689 } 1690 *perm++ = '\0'; 1691 if ((pw = getpwnam(user)) == NULL) { 1692 syslog(LOG_ERR, "no such user '%s'", user); 1693 goto more; 1694 } 1695 sep->se_sockuid = pw->pw_uid; 1696 if ((gr = getgrnam(group)) == NULL) { 1697 syslog(LOG_ERR, "no such user '%s'", group); 1698 goto more; 1699 } 1700 sep->se_sockgid = gr->gr_gid; 1701 sep->se_sockmode = strtol(perm, &arg, 8); 1702 if (*arg != ':') { 1703 syslog(LOG_ERR, "bad mode '%s'", perm); 1704 goto more; 1705 } 1706 *arg++ = '\0'; 1707 } else { 1708 sep->se_sockuid = euid; 1709 sep->se_sockgid = egid; 1710 sep->se_sockmode = 0200; 1711 } 1712 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1713 char *c = arg + MUX_LEN; 1714 if (*c == '+') { 1715 sep->se_type = MUXPLUS_TYPE; 1716 c++; 1717 } else 1718 sep->se_type = MUX_TYPE; 1719 sep->se_service = newstr(c); 1720 } else { 1721 sep->se_service = newstr(arg); 1722 sep->se_type = NORM_TYPE; 1723 } 1724 arg = sskip(&cp); 1725 if (strcmp(arg, "stream") == 0) 1726 sep->se_socktype = SOCK_STREAM; 1727 else if (strcmp(arg, "dgram") == 0) 1728 sep->se_socktype = SOCK_DGRAM; 1729 else if (strcmp(arg, "rdm") == 0) 1730 sep->se_socktype = SOCK_RDM; 1731 else if (strcmp(arg, "seqpacket") == 0) 1732 sep->se_socktype = SOCK_SEQPACKET; 1733 else if (strcmp(arg, "raw") == 0) 1734 sep->se_socktype = SOCK_RAW; 1735 else 1736 sep->se_socktype = -1; 1737 1738 arg = sskip(&cp); 1739 if (strncmp(arg, "tcp", 3) == 0) { 1740 sep->se_proto = newstr(strsep(&arg, "/")); 1741 if (arg != NULL && (strcmp(arg, "faith") == 0)) { 1742 syslog(LOG_ERR, "faith has been deprecated"); 1743 goto more; 1744 } 1745 } else { 1746 if (sep->se_type == NORM_TYPE && 1747 strncmp(arg, "faith/", 6) == 0) { 1748 syslog(LOG_ERR, "faith has been deprecated"); 1749 goto more; 1750 } 1751 sep->se_proto = newstr(arg); 1752 } 1753 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1754 memmove(sep->se_proto, sep->se_proto + 4, 1755 strlen(sep->se_proto) + 1 - 4); 1756 sep->se_rpc = 1; 1757 sep->se_rpc_prog = sep->se_rpc_lowvers = 1758 sep->se_rpc_highvers = 0; 1759 if ((versp = strrchr(sep->se_service, '/'))) { 1760 *versp++ = '\0'; 1761 switch (sscanf(versp, "%u-%u", 1762 &sep->se_rpc_lowvers, 1763 &sep->se_rpc_highvers)) { 1764 case 2: 1765 break; 1766 case 1: 1767 sep->se_rpc_highvers = 1768 sep->se_rpc_lowvers; 1769 break; 1770 default: 1771 syslog(LOG_ERR, 1772 "bad RPC version specifier; %s", 1773 sep->se_service); 1774 freeconfig(sep); 1775 goto more; 1776 } 1777 } 1778 else { 1779 sep->se_rpc_lowvers = 1780 sep->se_rpc_highvers = 1; 1781 } 1782 } 1783 sep->se_nomapped = 0; 1784 if (strcmp(sep->se_proto, "unix") == 0) { 1785 sep->se_family = AF_UNIX; 1786 } else { 1787 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1788 #ifdef INET6 1789 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1790 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1791 v6bind = 1; 1792 continue; 1793 } 1794 #endif 1795 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1796 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1797 #ifdef INET6 1798 v4bind = 1; 1799 #endif 1800 continue; 1801 } 1802 /* illegal version num */ 1803 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1804 freeconfig(sep); 1805 goto more; 1806 } 1807 #ifdef INET6 1808 if (v6bind && !v6bind_ok) { 1809 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1810 sep->se_service); 1811 if (v4bind && v4bind_ok) 1812 v6bind = 0; 1813 else { 1814 freeconfig(sep); 1815 goto more; 1816 } 1817 } 1818 if (v6bind) { 1819 sep->se_family = AF_INET6; 1820 if (!v4bind || !v4bind_ok) 1821 sep->se_nomapped = 1; 1822 } else 1823 #endif 1824 { /* default to v4 bind if not v6 bind */ 1825 if (!v4bind_ok) { 1826 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1827 sep->se_service); 1828 freeconfig(sep); 1829 goto more; 1830 } 1831 sep->se_family = AF_INET; 1832 } 1833 } 1834 /* init ctladdr */ 1835 switch(sep->se_family) { 1836 case AF_INET: 1837 memcpy(&sep->se_ctrladdr4, bind_sa4, 1838 sizeof(sep->se_ctrladdr4)); 1839 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1840 break; 1841 #ifdef INET6 1842 case AF_INET6: 1843 memcpy(&sep->se_ctrladdr6, bind_sa6, 1844 sizeof(sep->se_ctrladdr6)); 1845 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1846 break; 1847 #endif 1848 case AF_UNIX: 1849 #define SUN_PATH_MAXSIZE sizeof(sep->se_ctrladdr_un.sun_path) 1850 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1851 sep->se_ctrladdr_un.sun_family = sep->se_family; 1852 if (strlcpy(sep->se_ctrladdr_un.sun_path, sep->se_service, 1853 SUN_PATH_MAXSIZE) >= SUN_PATH_MAXSIZE) { 1854 syslog(LOG_ERR, 1855 "domain socket pathname too long for service %s", 1856 sep->se_service); 1857 goto more; 1858 } 1859 #undef SUN_PATH_MAXSIZE 1860 sep->se_ctrladdr_size = sep->se_ctrladdr_un.sun_len = 1861 SUN_LEN(&sep->se_ctrladdr_un); 1862 } 1863 arg = sskip(&cp); 1864 if (!strncmp(arg, "wait", 4)) 1865 sep->se_accept = 0; 1866 else if (!strncmp(arg, "nowait", 6)) 1867 sep->se_accept = 1; 1868 else { 1869 syslog(LOG_ERR, 1870 "%s: bad wait/nowait for service %s", 1871 CONFIG, sep->se_service); 1872 goto more; 1873 } 1874 sep->se_maxchild = -1; 1875 sep->se_maxcpm = -1; 1876 sep->se_maxperip = -1; 1877 if ((s = strchr(arg, '/')) != NULL) { 1878 char *eptr; 1879 u_long val; 1880 1881 val = strtoul(s + 1, &eptr, 10); 1882 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1883 syslog(LOG_ERR, 1884 "%s: bad max-child for service %s", 1885 CONFIG, sep->se_service); 1886 goto more; 1887 } 1888 if (debug) 1889 if (!sep->se_accept && val != 1) 1890 warnx("maxchild=%lu for wait service %s" 1891 " not recommended", val, sep->se_service); 1892 sep->se_maxchild = val; 1893 if (*eptr == '/') 1894 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1895 if (*eptr == '/') 1896 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1897 /* 1898 * explicitly do not check for \0 for future expansion / 1899 * backwards compatibility 1900 */ 1901 } 1902 if (ISMUX(sep)) { 1903 /* 1904 * Silently enforce "nowait" mode for TCPMUX services 1905 * since they don't have an assigned port to listen on. 1906 */ 1907 sep->se_accept = 1; 1908 if (strcmp(sep->se_proto, "tcp")) { 1909 syslog(LOG_ERR, 1910 "%s: bad protocol for tcpmux service %s", 1911 CONFIG, sep->se_service); 1912 goto more; 1913 } 1914 if (sep->se_socktype != SOCK_STREAM) { 1915 syslog(LOG_ERR, 1916 "%s: bad socket type for tcpmux service %s", 1917 CONFIG, sep->se_service); 1918 goto more; 1919 } 1920 } 1921 sep->se_user = newstr(sskip(&cp)); 1922 #ifdef LOGIN_CAP 1923 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1924 *s = '\0'; 1925 sep->se_class = newstr(s + 1); 1926 } else 1927 sep->se_class = newstr(RESOURCE_RC); 1928 #endif 1929 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1930 *s = '\0'; 1931 sep->se_group = newstr(s + 1); 1932 } else 1933 sep->se_group = NULL; 1934 sep->se_server = newstr(sskip(&cp)); 1935 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1936 sep->se_server_name++; 1937 if (strcmp(sep->se_server, "internal") == 0) { 1938 struct biltin *bi; 1939 1940 for (bi = biltins; bi->bi_service; bi++) 1941 if (bi->bi_socktype == sep->se_socktype && 1942 matchservent(bi->bi_service, sep->se_service, 1943 sep->se_proto)) 1944 break; 1945 if (bi->bi_service == 0) { 1946 syslog(LOG_ERR, "internal service %s unknown", 1947 sep->se_service); 1948 goto more; 1949 } 1950 sep->se_accept = 1; /* force accept mode for built-ins */ 1951 sep->se_bi = bi; 1952 } else 1953 sep->se_bi = NULL; 1954 if (sep->se_maxperip < 0) 1955 sep->se_maxperip = maxperip; 1956 if (sep->se_maxcpm < 0) 1957 sep->se_maxcpm = maxcpm; 1958 if (sep->se_maxchild < 0) { /* apply default max-children */ 1959 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1960 sep->se_maxchild = sep->se_bi->bi_maxchild; 1961 else if (sep->se_accept) 1962 sep->se_maxchild = MAX(maxchild, 0); 1963 else 1964 sep->se_maxchild = 1; 1965 } 1966 LIST_INIT(&sep->se_children); 1967 argc = 0; 1968 for (arg = skip(&cp); cp; arg = skip(&cp)) 1969 if (argc < MAXARGV) { 1970 sep->se_argv[argc++] = newstr(arg); 1971 } else { 1972 syslog(LOG_ERR, 1973 "%s: too many arguments for service %s", 1974 CONFIG, sep->se_service); 1975 goto more; 1976 } 1977 while (argc <= MAXARGV) 1978 sep->se_argv[argc++] = NULL; 1979 for (i = 0; i < PERIPSIZE; ++i) 1980 LIST_INIT(&sep->se_conn[i]); 1981 #ifdef IPSEC 1982 sep->se_policy = policy ? newstr(policy) : NULL; 1983 free(policy); 1984 #endif 1985 return (sep); 1986 } 1987 1988 static void 1989 freeconfig(struct servtab *cp) 1990 { 1991 struct stabchild *sc; 1992 int i; 1993 1994 free(cp->se_service); 1995 free(cp->se_proto); 1996 free(cp->se_user); 1997 free(cp->se_group); 1998 #ifdef LOGIN_CAP 1999 free(cp->se_class); 2000 #endif 2001 free(cp->se_server); 2002 while (!LIST_EMPTY(&cp->se_children)) { 2003 sc = LIST_FIRST(&cp->se_children); 2004 LIST_REMOVE(sc, sc_link); 2005 free(sc); 2006 } 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 free(cp->se_policy); 2013 #endif 2014 } 2015 2016 2017 /* 2018 * Safe skip - if skip returns null, log a syntax error in the 2019 * configuration file and exit. 2020 */ 2021 static char * 2022 sskip(char **cpp) 2023 { 2024 char *cp; 2025 2026 cp = skip(cpp); 2027 if (cp == NULL) { 2028 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2029 exit(EX_DATAERR); 2030 } 2031 return (cp); 2032 } 2033 2034 static char * 2035 skip(char **cpp) 2036 { 2037 char *cp = *cpp; 2038 char *start; 2039 char quote = '\0'; 2040 2041 again: 2042 while (*cp == ' ' || *cp == '\t') 2043 cp++; 2044 if (*cp == '\0') { 2045 int c; 2046 2047 c = getc(fconfig); 2048 (void) ungetc(c, fconfig); 2049 if (c == ' ' || c == '\t') 2050 if ((cp = nextline(fconfig))) 2051 goto again; 2052 *cpp = (char *)0; 2053 return ((char *)0); 2054 } 2055 if (*cp == '"' || *cp == '\'') 2056 quote = *cp++; 2057 start = cp; 2058 if (quote) 2059 while (*cp && *cp != quote) 2060 cp++; 2061 else 2062 while (*cp && *cp != ' ' && *cp != '\t') 2063 cp++; 2064 if (*cp != '\0') 2065 *cp++ = '\0'; 2066 *cpp = cp; 2067 return (start); 2068 } 2069 2070 static char * 2071 nextline(FILE *fd) 2072 { 2073 char *cp; 2074 2075 if (fgets(line, sizeof (line), fd) == NULL) 2076 return ((char *)0); 2077 cp = strchr(line, '\n'); 2078 if (cp) 2079 *cp = '\0'; 2080 return (line); 2081 } 2082 2083 static char * 2084 newstr(const char *cp) 2085 { 2086 char *cr; 2087 2088 if ((cr = strdup(cp != NULL ? cp : ""))) 2089 return (cr); 2090 syslog(LOG_ERR, "strdup: %m"); 2091 exit(EX_OSERR); 2092 } 2093 2094 void 2095 inetd_setproctitle(const char *a, int s) 2096 { 2097 socklen_t size; 2098 struct sockaddr_storage ss; 2099 char buf[80], pbuf[NI_MAXHOST]; 2100 2101 size = sizeof(ss); 2102 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2103 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2104 NULL, 0, NI_NUMERICHOST); 2105 (void) sprintf(buf, "%s [%s]", a, pbuf); 2106 } else 2107 (void) sprintf(buf, "%s", a); 2108 setproctitle("%s", buf); 2109 } 2110 2111 int 2112 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2113 { 2114 struct servtab *se2; 2115 char pname[NI_MAXHOST]; 2116 2117 for (se2 = servtab; se2; se2 = se2->se_next) { 2118 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2119 continue; 2120 2121 switch (se2->se_family) { 2122 case AF_INET: 2123 if (csatosin(sa)->sin_port == 2124 se2->se_ctrladdr4.sin_port) 2125 goto isloop; 2126 continue; 2127 #ifdef INET6 2128 case AF_INET6: 2129 if (csatosin6(sa)->sin6_port == 2130 se2->se_ctrladdr6.sin6_port) 2131 goto isloop; 2132 continue; 2133 #endif 2134 default: 2135 continue; 2136 } 2137 isloop: 2138 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2139 NI_NUMERICHOST); 2140 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2141 sep->se_service, sep->se_proto, 2142 se2->se_service, se2->se_proto, 2143 pname); 2144 return 1; 2145 } 2146 return 0; 2147 } 2148 2149 /* 2150 * print_service: 2151 * Dump relevant information to stderr 2152 */ 2153 static void 2154 print_service(const char *action, const struct servtab *sep) 2155 { 2156 fprintf(stderr, 2157 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2158 #ifdef LOGIN_CAP 2159 "class=%s" 2160 #endif 2161 " builtin=%p server=%s" 2162 #ifdef IPSEC 2163 " policy=\"%s\"" 2164 #endif 2165 "\n", 2166 action, sep->se_service, sep->se_proto, 2167 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2168 #ifdef LOGIN_CAP 2169 sep->se_class, 2170 #endif 2171 (void *) sep->se_bi, sep->se_server 2172 #ifdef IPSEC 2173 , (sep->se_policy ? sep->se_policy : "") 2174 #endif 2175 ); 2176 } 2177 2178 #define CPMHSIZE 256 2179 #define CPMHMASK (CPMHSIZE-1) 2180 #define CHTGRAN 10 2181 #define CHTSIZE 6 2182 2183 typedef struct CTime { 2184 unsigned long ct_Ticks; 2185 int ct_Count; 2186 } CTime; 2187 2188 typedef struct CHash { 2189 union { 2190 struct in_addr c4_Addr; 2191 struct in6_addr c6_Addr; 2192 } cu_Addr; 2193 #define ch_Addr4 cu_Addr.c4_Addr 2194 #define ch_Addr6 cu_Addr.c6_Addr 2195 int ch_Family; 2196 time_t ch_LTime; 2197 char *ch_Service; 2198 CTime ch_Times[CHTSIZE]; 2199 } CHash; 2200 2201 static CHash CHashAry[CPMHSIZE]; 2202 2203 static int 2204 cpmip(const struct servtab *sep, int ctrl) 2205 { 2206 struct sockaddr_storage rss; 2207 socklen_t rssLen = sizeof(rss); 2208 int r = 0; 2209 2210 /* 2211 * If getpeername() fails, just let it through (if logging is 2212 * enabled the condition is caught elsewhere) 2213 */ 2214 2215 if (sep->se_maxcpm > 0 && 2216 (sep->se_family == AF_INET || sep->se_family == AF_INET6) && 2217 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2218 time_t t = time(NULL); 2219 unsigned int hv = 0xABC3D20F; 2220 int i; 2221 int cnt = 0; 2222 CHash *chBest = NULL; 2223 unsigned int ticks = t / CHTGRAN; 2224 struct sockaddr_in *sin4; 2225 #ifdef INET6 2226 struct sockaddr_in6 *sin6; 2227 #endif 2228 2229 sin4 = (struct sockaddr_in *)&rss; 2230 #ifdef INET6 2231 sin6 = (struct sockaddr_in6 *)&rss; 2232 #endif 2233 { 2234 char *p; 2235 int addrlen; 2236 2237 switch (rss.ss_family) { 2238 case AF_INET: 2239 p = (char *)&sin4->sin_addr; 2240 addrlen = sizeof(struct in_addr); 2241 break; 2242 #ifdef INET6 2243 case AF_INET6: 2244 p = (char *)&sin6->sin6_addr; 2245 addrlen = sizeof(struct in6_addr); 2246 break; 2247 #endif 2248 default: 2249 /* should not happen */ 2250 return -1; 2251 } 2252 2253 for (i = 0; i < addrlen; ++i, ++p) { 2254 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2255 } 2256 hv = (hv ^ (hv >> 16)); 2257 } 2258 for (i = 0; i < 5; ++i) { 2259 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2260 2261 if (rss.ss_family == AF_INET && 2262 ch->ch_Family == AF_INET && 2263 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2264 ch->ch_Service && strcmp(sep->se_service, 2265 ch->ch_Service) == 0) { 2266 chBest = ch; 2267 break; 2268 } 2269 #ifdef INET6 2270 if (rss.ss_family == AF_INET6 && 2271 ch->ch_Family == AF_INET6 && 2272 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2273 &ch->ch_Addr6) != 0 && 2274 ch->ch_Service && strcmp(sep->se_service, 2275 ch->ch_Service) == 0) { 2276 chBest = ch; 2277 break; 2278 } 2279 #endif 2280 if (chBest == NULL || ch->ch_LTime == 0 || 2281 ch->ch_LTime < chBest->ch_LTime) { 2282 chBest = ch; 2283 } 2284 } 2285 if ((rss.ss_family == AF_INET && 2286 (chBest->ch_Family != AF_INET || 2287 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2288 chBest->ch_Service == NULL || 2289 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2290 chBest->ch_Family = sin4->sin_family; 2291 chBest->ch_Addr4 = sin4->sin_addr; 2292 free(chBest->ch_Service); 2293 chBest->ch_Service = strdup(sep->se_service); 2294 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times)); 2295 } 2296 #ifdef INET6 2297 if ((rss.ss_family == AF_INET6 && 2298 (chBest->ch_Family != AF_INET6 || 2299 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2300 &chBest->ch_Addr6) == 0)) || 2301 chBest->ch_Service == NULL || 2302 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2303 chBest->ch_Family = sin6->sin6_family; 2304 chBest->ch_Addr6 = sin6->sin6_addr; 2305 free(chBest->ch_Service); 2306 chBest->ch_Service = strdup(sep->se_service); 2307 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times)); 2308 } 2309 #endif 2310 chBest->ch_LTime = t; 2311 { 2312 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2313 if (ct->ct_Ticks != ticks) { 2314 ct->ct_Ticks = ticks; 2315 ct->ct_Count = 0; 2316 } 2317 ++ct->ct_Count; 2318 } 2319 for (i = 0; i < CHTSIZE; ++i) { 2320 CTime *ct = &chBest->ch_Times[i]; 2321 if (ct->ct_Ticks <= ticks && 2322 ct->ct_Ticks >= ticks - CHTSIZE) { 2323 cnt += ct->ct_Count; 2324 } 2325 } 2326 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2327 char pname[NI_MAXHOST]; 2328 2329 getnameinfo((struct sockaddr *)&rss, 2330 ((struct sockaddr *)&rss)->sa_len, 2331 pname, sizeof(pname), NULL, 0, 2332 NI_NUMERICHOST); 2333 r = -1; 2334 syslog(LOG_ERR, 2335 "%s from %s exceeded counts/min (limit %d/min)", 2336 sep->se_service, pname, 2337 sep->se_maxcpm); 2338 } 2339 } 2340 return(r); 2341 } 2342 2343 static struct conninfo * 2344 search_conn(struct servtab *sep, int ctrl) 2345 { 2346 struct sockaddr_storage ss; 2347 socklen_t sslen = sizeof(ss); 2348 struct conninfo *conn; 2349 int hv; 2350 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2351 2352 if (sep->se_maxperip <= 0) 2353 return NULL; 2354 2355 /* 2356 * If getpeername() fails, just let it through (if logging is 2357 * enabled the condition is caught elsewhere) 2358 */ 2359 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2360 return NULL; 2361 2362 switch (ss.ss_family) { 2363 case AF_INET: 2364 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2365 sizeof(struct in_addr)); 2366 break; 2367 #ifdef INET6 2368 case AF_INET6: 2369 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2370 sizeof(struct in6_addr)); 2371 break; 2372 #endif 2373 default: 2374 /* 2375 * Since we only support AF_INET and AF_INET6, just 2376 * let other than AF_INET and AF_INET6 through. 2377 */ 2378 return NULL; 2379 } 2380 2381 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2382 NULL, 0, NI_NUMERICHOST) != 0) 2383 return NULL; 2384 2385 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2386 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2387 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2388 NI_NUMERICHOST) == 0 && 2389 strcmp(pname, pname2) == 0) 2390 break; 2391 } 2392 2393 if (conn == NULL) { 2394 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2395 syslog(LOG_ERR, "malloc: %m"); 2396 exit(EX_OSERR); 2397 } 2398 conn->co_proc = reallocarray(NULL, sep->se_maxperip, 2399 sizeof(*conn->co_proc)); 2400 if (conn->co_proc == NULL) { 2401 syslog(LOG_ERR, "reallocarray: %m"); 2402 exit(EX_OSERR); 2403 } 2404 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2405 conn->co_numchild = 0; 2406 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2407 } 2408 2409 /* 2410 * Since a child process is not invoked yet, we cannot 2411 * determine a pid of a child. So, co_proc and co_numchild 2412 * should be filled leter. 2413 */ 2414 2415 return conn; 2416 } 2417 2418 static int 2419 room_conn(struct servtab *sep, struct conninfo *conn) 2420 { 2421 char pname[NI_MAXHOST]; 2422 2423 if (conn->co_numchild >= sep->se_maxperip) { 2424 getnameinfo((struct sockaddr *)&conn->co_addr, 2425 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2426 NI_NUMERICHOST); 2427 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2428 sep->se_service, pname, sep->se_maxperip); 2429 return 0; 2430 } 2431 return 1; 2432 } 2433 2434 static void 2435 addchild_conn(struct conninfo *conn, pid_t pid) 2436 { 2437 struct procinfo *proc; 2438 2439 if (conn == NULL) 2440 return; 2441 2442 if ((proc = search_proc(pid, 1)) != NULL) { 2443 if (proc->pr_conn != NULL) { 2444 syslog(LOG_ERR, 2445 "addchild_conn: child already on process list"); 2446 exit(EX_OSERR); 2447 } 2448 proc->pr_conn = conn; 2449 } 2450 2451 conn->co_proc[conn->co_numchild++] = proc; 2452 } 2453 2454 static void 2455 reapchild_conn(pid_t pid) 2456 { 2457 struct procinfo *proc; 2458 struct conninfo *conn; 2459 int i; 2460 2461 if ((proc = search_proc(pid, 0)) == NULL) 2462 return; 2463 if ((conn = proc->pr_conn) == NULL) 2464 return; 2465 for (i = 0; i < conn->co_numchild; ++i) 2466 if (conn->co_proc[i] == proc) { 2467 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2468 break; 2469 } 2470 free_proc(proc); 2471 free_conn(conn); 2472 } 2473 2474 static void 2475 resize_conn(struct servtab *sep, int maxpip) 2476 { 2477 struct conninfo *conn; 2478 int i, j; 2479 2480 if (sep->se_maxperip <= 0) 2481 return; 2482 if (maxpip <= 0) { 2483 free_connlist(sep); 2484 return; 2485 } 2486 for (i = 0; i < PERIPSIZE; ++i) { 2487 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2488 for (j = maxpip; j < conn->co_numchild; ++j) 2489 free_proc(conn->co_proc[j]); 2490 conn->co_proc = reallocarray(conn->co_proc, maxpip, 2491 sizeof(*conn->co_proc)); 2492 if (conn->co_proc == NULL) { 2493 syslog(LOG_ERR, "reallocarray: %m"); 2494 exit(EX_OSERR); 2495 } 2496 if (conn->co_numchild > maxpip) 2497 conn->co_numchild = maxpip; 2498 } 2499 } 2500 } 2501 2502 static void 2503 free_connlist(struct servtab *sep) 2504 { 2505 struct conninfo *conn, *conn_temp; 2506 int i, j; 2507 2508 for (i = 0; i < PERIPSIZE; ++i) { 2509 LIST_FOREACH_SAFE(conn, &sep->se_conn[i], co_link, conn_temp) { 2510 if (conn == NULL) { 2511 LIST_REMOVE(conn, co_link); 2512 continue; 2513 } 2514 for (j = 0; j < conn->co_numchild; ++j) 2515 free_proc(conn->co_proc[j]); 2516 conn->co_numchild = 0; 2517 free_conn(conn); 2518 } 2519 } 2520 } 2521 2522 static void 2523 free_conn(struct conninfo *conn) 2524 { 2525 if (conn == NULL) 2526 return; 2527 if (conn->co_numchild <= 0) { 2528 LIST_REMOVE(conn, co_link); 2529 free(conn->co_proc); 2530 free(conn); 2531 } 2532 } 2533 2534 static struct procinfo * 2535 search_proc(pid_t pid, int add) 2536 { 2537 struct procinfo *proc; 2538 int hv; 2539 2540 hv = hashval((char *)&pid, sizeof(pid)); 2541 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2542 if (proc->pr_pid == pid) 2543 break; 2544 } 2545 if (proc == NULL && add) { 2546 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2547 syslog(LOG_ERR, "malloc: %m"); 2548 exit(EX_OSERR); 2549 } 2550 proc->pr_pid = pid; 2551 proc->pr_conn = NULL; 2552 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2553 } 2554 return proc; 2555 } 2556 2557 static void 2558 free_proc(struct procinfo *proc) 2559 { 2560 if (proc == NULL) 2561 return; 2562 LIST_REMOVE(proc, pr_link); 2563 free(proc); 2564 } 2565 2566 static int 2567 hashval(char *p, int len) 2568 { 2569 unsigned int hv = 0xABC3D20F; 2570 int i; 2571 2572 for (i = 0; i < len; ++i, ++p) 2573 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2574 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2575 return hv; 2576 } 2577