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 size_t unsz; 1628 1629 #ifdef IPSEC 1630 policy = NULL; 1631 #endif 1632 more: 1633 #ifdef INET6 1634 v4bind = 0; 1635 v6bind = 0; 1636 #endif 1637 while ((cp = nextline(fconfig)) != NULL) { 1638 #ifdef IPSEC 1639 /* lines starting with #@ is not a comment, but the policy */ 1640 if (cp[0] == '#' && cp[1] == '@') { 1641 char *p; 1642 for (p = cp + 2; p && *p && isspace(*p); p++) 1643 ; 1644 if (*p == '\0') { 1645 free(policy); 1646 policy = NULL; 1647 } else if (ipsec_get_policylen(p) >= 0) { 1648 free(policy); 1649 policy = newstr(p); 1650 } else { 1651 syslog(LOG_ERR, 1652 "%s: invalid ipsec policy \"%s\"", 1653 CONFIG, p); 1654 exit(EX_CONFIG); 1655 } 1656 } 1657 #endif 1658 if (*cp == '#' || *cp == '\0') 1659 continue; 1660 break; 1661 } 1662 if (cp == NULL) { 1663 #ifdef IPSEC 1664 free(policy); 1665 #endif 1666 return (NULL); 1667 } 1668 1669 /* 1670 * clear the static buffer, since some fields (se_ctrladdr, 1671 * for example) don't get initialized here. 1672 */ 1673 memset(sep, 0, sizeof *sep); 1674 arg = skip(&cp); 1675 if (cp == NULL) { 1676 /* got an empty line containing just blanks/tabs. */ 1677 goto more; 1678 } 1679 if (arg[0] == ':') { /* :user:group:perm: */ 1680 char *user, *group, *perm; 1681 struct passwd *pw; 1682 struct group *gr; 1683 user = arg+1; 1684 if ((group = strchr(user, ':')) == NULL) { 1685 syslog(LOG_ERR, "no group after user '%s'", user); 1686 goto more; 1687 } 1688 *group++ = '\0'; 1689 if ((perm = strchr(group, ':')) == NULL) { 1690 syslog(LOG_ERR, "no mode after group '%s'", group); 1691 goto more; 1692 } 1693 *perm++ = '\0'; 1694 if ((pw = getpwnam(user)) == NULL) { 1695 syslog(LOG_ERR, "no such user '%s'", user); 1696 goto more; 1697 } 1698 sep->se_sockuid = pw->pw_uid; 1699 if ((gr = getgrnam(group)) == NULL) { 1700 syslog(LOG_ERR, "no such user '%s'", group); 1701 goto more; 1702 } 1703 sep->se_sockgid = gr->gr_gid; 1704 sep->se_sockmode = strtol(perm, &arg, 8); 1705 if (*arg != ':') { 1706 syslog(LOG_ERR, "bad mode '%s'", perm); 1707 goto more; 1708 } 1709 *arg++ = '\0'; 1710 } else { 1711 sep->se_sockuid = euid; 1712 sep->se_sockgid = egid; 1713 sep->se_sockmode = 0200; 1714 } 1715 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1716 char *c = arg + MUX_LEN; 1717 if (*c == '+') { 1718 sep->se_type = MUXPLUS_TYPE; 1719 c++; 1720 } else 1721 sep->se_type = MUX_TYPE; 1722 sep->se_service = newstr(c); 1723 } else { 1724 sep->se_service = newstr(arg); 1725 sep->se_type = NORM_TYPE; 1726 } 1727 arg = sskip(&cp); 1728 if (strcmp(arg, "stream") == 0) 1729 sep->se_socktype = SOCK_STREAM; 1730 else if (strcmp(arg, "dgram") == 0) 1731 sep->se_socktype = SOCK_DGRAM; 1732 else if (strcmp(arg, "rdm") == 0) 1733 sep->se_socktype = SOCK_RDM; 1734 else if (strcmp(arg, "seqpacket") == 0) 1735 sep->se_socktype = SOCK_SEQPACKET; 1736 else if (strcmp(arg, "raw") == 0) 1737 sep->se_socktype = SOCK_RAW; 1738 else 1739 sep->se_socktype = -1; 1740 1741 arg = sskip(&cp); 1742 if (strncmp(arg, "tcp", 3) == 0) { 1743 sep->se_proto = newstr(strsep(&arg, "/")); 1744 if (arg != NULL && (strcmp(arg, "faith") == 0)) { 1745 syslog(LOG_ERR, "faith has been deprecated"); 1746 goto more; 1747 } 1748 } else { 1749 if (sep->se_type == NORM_TYPE && 1750 strncmp(arg, "faith/", 6) == 0) { 1751 syslog(LOG_ERR, "faith has been deprecated"); 1752 goto more; 1753 } 1754 sep->se_proto = newstr(arg); 1755 } 1756 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1757 memmove(sep->se_proto, sep->se_proto + 4, 1758 strlen(sep->se_proto) + 1 - 4); 1759 sep->se_rpc = 1; 1760 sep->se_rpc_prog = sep->se_rpc_lowvers = 1761 sep->se_rpc_highvers = 0; 1762 if ((versp = strrchr(sep->se_service, '/'))) { 1763 *versp++ = '\0'; 1764 switch (sscanf(versp, "%u-%u", 1765 &sep->se_rpc_lowvers, 1766 &sep->se_rpc_highvers)) { 1767 case 2: 1768 break; 1769 case 1: 1770 sep->se_rpc_highvers = 1771 sep->se_rpc_lowvers; 1772 break; 1773 default: 1774 syslog(LOG_ERR, 1775 "bad RPC version specifier; %s", 1776 sep->se_service); 1777 freeconfig(sep); 1778 goto more; 1779 } 1780 } 1781 else { 1782 sep->se_rpc_lowvers = 1783 sep->se_rpc_highvers = 1; 1784 } 1785 } 1786 sep->se_nomapped = 0; 1787 if (strcmp(sep->se_proto, "unix") == 0) { 1788 sep->se_family = AF_UNIX; 1789 } else { 1790 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1791 #ifdef INET6 1792 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1793 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1794 v6bind = 1; 1795 continue; 1796 } 1797 #endif 1798 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1799 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1800 #ifdef INET6 1801 v4bind = 1; 1802 #endif 1803 continue; 1804 } 1805 /* illegal version num */ 1806 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1807 freeconfig(sep); 1808 goto more; 1809 } 1810 #ifdef INET6 1811 if (v6bind && !v6bind_ok) { 1812 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1813 sep->se_service); 1814 if (v4bind && v4bind_ok) 1815 v6bind = 0; 1816 else { 1817 freeconfig(sep); 1818 goto more; 1819 } 1820 } 1821 if (v6bind) { 1822 sep->se_family = AF_INET6; 1823 if (!v4bind || !v4bind_ok) 1824 sep->se_nomapped = 1; 1825 } else 1826 #endif 1827 { /* default to v4 bind if not v6 bind */ 1828 if (!v4bind_ok) { 1829 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1830 sep->se_service); 1831 freeconfig(sep); 1832 goto more; 1833 } 1834 sep->se_family = AF_INET; 1835 } 1836 } 1837 /* init ctladdr */ 1838 switch(sep->se_family) { 1839 case AF_INET: 1840 memcpy(&sep->se_ctrladdr4, bind_sa4, 1841 sizeof(sep->se_ctrladdr4)); 1842 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1843 break; 1844 #ifdef INET6 1845 case AF_INET6: 1846 memcpy(&sep->se_ctrladdr6, bind_sa6, 1847 sizeof(sep->se_ctrladdr6)); 1848 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1849 break; 1850 #endif 1851 case AF_UNIX: 1852 #define SUN_PATH_MAXSIZE sizeof(sep->se_ctrladdr_un.sun_path) 1853 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1854 sep->se_ctrladdr_un.sun_family = sep->se_family; 1855 if ((unsz = strlcpy(sep->se_ctrladdr_un.sun_path, 1856 sep->se_service, SUN_PATH_MAXSIZE) >= SUN_PATH_MAXSIZE)) { 1857 syslog(LOG_ERR, 1858 "domain socket pathname too long for service %s", 1859 sep->se_service); 1860 goto more; 1861 } 1862 sep->se_ctrladdr_un.sun_len = unsz; 1863 #undef SUN_PATH_MAXSIZE 1864 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1865 } 1866 arg = sskip(&cp); 1867 if (!strncmp(arg, "wait", 4)) 1868 sep->se_accept = 0; 1869 else if (!strncmp(arg, "nowait", 6)) 1870 sep->se_accept = 1; 1871 else { 1872 syslog(LOG_ERR, 1873 "%s: bad wait/nowait for service %s", 1874 CONFIG, sep->se_service); 1875 goto more; 1876 } 1877 sep->se_maxchild = -1; 1878 sep->se_maxcpm = -1; 1879 sep->se_maxperip = -1; 1880 if ((s = strchr(arg, '/')) != NULL) { 1881 char *eptr; 1882 u_long val; 1883 1884 val = strtoul(s + 1, &eptr, 10); 1885 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1886 syslog(LOG_ERR, 1887 "%s: bad max-child for service %s", 1888 CONFIG, sep->se_service); 1889 goto more; 1890 } 1891 if (debug) 1892 if (!sep->se_accept && val != 1) 1893 warnx("maxchild=%lu for wait service %s" 1894 " not recommended", val, sep->se_service); 1895 sep->se_maxchild = val; 1896 if (*eptr == '/') 1897 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1898 if (*eptr == '/') 1899 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1900 /* 1901 * explicitly do not check for \0 for future expansion / 1902 * backwards compatibility 1903 */ 1904 } 1905 if (ISMUX(sep)) { 1906 /* 1907 * Silently enforce "nowait" mode for TCPMUX services 1908 * since they don't have an assigned port to listen on. 1909 */ 1910 sep->se_accept = 1; 1911 if (strcmp(sep->se_proto, "tcp")) { 1912 syslog(LOG_ERR, 1913 "%s: bad protocol for tcpmux service %s", 1914 CONFIG, sep->se_service); 1915 goto more; 1916 } 1917 if (sep->se_socktype != SOCK_STREAM) { 1918 syslog(LOG_ERR, 1919 "%s: bad socket type for tcpmux service %s", 1920 CONFIG, sep->se_service); 1921 goto more; 1922 } 1923 } 1924 sep->se_user = newstr(sskip(&cp)); 1925 #ifdef LOGIN_CAP 1926 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1927 *s = '\0'; 1928 sep->se_class = newstr(s + 1); 1929 } else 1930 sep->se_class = newstr(RESOURCE_RC); 1931 #endif 1932 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1933 *s = '\0'; 1934 sep->se_group = newstr(s + 1); 1935 } else 1936 sep->se_group = NULL; 1937 sep->se_server = newstr(sskip(&cp)); 1938 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1939 sep->se_server_name++; 1940 if (strcmp(sep->se_server, "internal") == 0) { 1941 struct biltin *bi; 1942 1943 for (bi = biltins; bi->bi_service; bi++) 1944 if (bi->bi_socktype == sep->se_socktype && 1945 matchservent(bi->bi_service, sep->se_service, 1946 sep->se_proto)) 1947 break; 1948 if (bi->bi_service == 0) { 1949 syslog(LOG_ERR, "internal service %s unknown", 1950 sep->se_service); 1951 goto more; 1952 } 1953 sep->se_accept = 1; /* force accept mode for built-ins */ 1954 sep->se_bi = bi; 1955 } else 1956 sep->se_bi = NULL; 1957 if (sep->se_maxperip < 0) 1958 sep->se_maxperip = maxperip; 1959 if (sep->se_maxcpm < 0) 1960 sep->se_maxcpm = maxcpm; 1961 if (sep->se_maxchild < 0) { /* apply default max-children */ 1962 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1963 sep->se_maxchild = sep->se_bi->bi_maxchild; 1964 else if (sep->se_accept) 1965 sep->se_maxchild = MAX(maxchild, 0); 1966 else 1967 sep->se_maxchild = 1; 1968 } 1969 LIST_INIT(&sep->se_children); 1970 argc = 0; 1971 for (arg = skip(&cp); cp; arg = skip(&cp)) 1972 if (argc < MAXARGV) { 1973 sep->se_argv[argc++] = newstr(arg); 1974 } else { 1975 syslog(LOG_ERR, 1976 "%s: too many arguments for service %s", 1977 CONFIG, sep->se_service); 1978 goto more; 1979 } 1980 while (argc <= MAXARGV) 1981 sep->se_argv[argc++] = NULL; 1982 for (i = 0; i < PERIPSIZE; ++i) 1983 LIST_INIT(&sep->se_conn[i]); 1984 #ifdef IPSEC 1985 sep->se_policy = policy ? newstr(policy) : NULL; 1986 free(policy); 1987 #endif 1988 return (sep); 1989 } 1990 1991 static void 1992 freeconfig(struct servtab *cp) 1993 { 1994 struct stabchild *sc; 1995 int i; 1996 1997 free(cp->se_service); 1998 free(cp->se_proto); 1999 free(cp->se_user); 2000 free(cp->se_group); 2001 #ifdef LOGIN_CAP 2002 free(cp->se_class); 2003 #endif 2004 free(cp->se_server); 2005 while (!LIST_EMPTY(&cp->se_children)) { 2006 sc = LIST_FIRST(&cp->se_children); 2007 LIST_REMOVE(sc, sc_link); 2008 free(sc); 2009 } 2010 for (i = 0; i < MAXARGV; i++) 2011 if (cp->se_argv[i]) 2012 free(cp->se_argv[i]); 2013 free_connlist(cp); 2014 #ifdef IPSEC 2015 free(cp->se_policy); 2016 #endif 2017 } 2018 2019 2020 /* 2021 * Safe skip - if skip returns null, log a syntax error in the 2022 * configuration file and exit. 2023 */ 2024 static char * 2025 sskip(char **cpp) 2026 { 2027 char *cp; 2028 2029 cp = skip(cpp); 2030 if (cp == NULL) { 2031 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2032 exit(EX_DATAERR); 2033 } 2034 return (cp); 2035 } 2036 2037 static char * 2038 skip(char **cpp) 2039 { 2040 char *cp = *cpp; 2041 char *start; 2042 char quote = '\0'; 2043 2044 again: 2045 while (*cp == ' ' || *cp == '\t') 2046 cp++; 2047 if (*cp == '\0') { 2048 int c; 2049 2050 c = getc(fconfig); 2051 (void) ungetc(c, fconfig); 2052 if (c == ' ' || c == '\t') 2053 if ((cp = nextline(fconfig))) 2054 goto again; 2055 *cpp = (char *)0; 2056 return ((char *)0); 2057 } 2058 if (*cp == '"' || *cp == '\'') 2059 quote = *cp++; 2060 start = cp; 2061 if (quote) 2062 while (*cp && *cp != quote) 2063 cp++; 2064 else 2065 while (*cp && *cp != ' ' && *cp != '\t') 2066 cp++; 2067 if (*cp != '\0') 2068 *cp++ = '\0'; 2069 *cpp = cp; 2070 return (start); 2071 } 2072 2073 static char * 2074 nextline(FILE *fd) 2075 { 2076 char *cp; 2077 2078 if (fgets(line, sizeof (line), fd) == NULL) 2079 return ((char *)0); 2080 cp = strchr(line, '\n'); 2081 if (cp) 2082 *cp = '\0'; 2083 return (line); 2084 } 2085 2086 static char * 2087 newstr(const char *cp) 2088 { 2089 char *cr; 2090 2091 if ((cr = strdup(cp != NULL ? cp : ""))) 2092 return (cr); 2093 syslog(LOG_ERR, "strdup: %m"); 2094 exit(EX_OSERR); 2095 } 2096 2097 void 2098 inetd_setproctitle(const char *a, int s) 2099 { 2100 socklen_t size; 2101 struct sockaddr_storage ss; 2102 char buf[80], pbuf[NI_MAXHOST]; 2103 2104 size = sizeof(ss); 2105 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2106 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2107 NULL, 0, NI_NUMERICHOST); 2108 (void) sprintf(buf, "%s [%s]", a, pbuf); 2109 } else 2110 (void) sprintf(buf, "%s", a); 2111 setproctitle("%s", buf); 2112 } 2113 2114 int 2115 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2116 { 2117 struct servtab *se2; 2118 char pname[NI_MAXHOST]; 2119 2120 for (se2 = servtab; se2; se2 = se2->se_next) { 2121 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2122 continue; 2123 2124 switch (se2->se_family) { 2125 case AF_INET: 2126 if (csatosin(sa)->sin_port == 2127 se2->se_ctrladdr4.sin_port) 2128 goto isloop; 2129 continue; 2130 #ifdef INET6 2131 case AF_INET6: 2132 if (csatosin6(sa)->sin6_port == 2133 se2->se_ctrladdr6.sin6_port) 2134 goto isloop; 2135 continue; 2136 #endif 2137 default: 2138 continue; 2139 } 2140 isloop: 2141 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2142 NI_NUMERICHOST); 2143 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2144 sep->se_service, sep->se_proto, 2145 se2->se_service, se2->se_proto, 2146 pname); 2147 return 1; 2148 } 2149 return 0; 2150 } 2151 2152 /* 2153 * print_service: 2154 * Dump relevant information to stderr 2155 */ 2156 static void 2157 print_service(const char *action, const struct servtab *sep) 2158 { 2159 fprintf(stderr, 2160 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2161 #ifdef LOGIN_CAP 2162 "class=%s" 2163 #endif 2164 " builtin=%p server=%s" 2165 #ifdef IPSEC 2166 " policy=\"%s\"" 2167 #endif 2168 "\n", 2169 action, sep->se_service, sep->se_proto, 2170 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2171 #ifdef LOGIN_CAP 2172 sep->se_class, 2173 #endif 2174 (void *) sep->se_bi, sep->se_server 2175 #ifdef IPSEC 2176 , (sep->se_policy ? sep->se_policy : "") 2177 #endif 2178 ); 2179 } 2180 2181 #define CPMHSIZE 256 2182 #define CPMHMASK (CPMHSIZE-1) 2183 #define CHTGRAN 10 2184 #define CHTSIZE 6 2185 2186 typedef struct CTime { 2187 unsigned long ct_Ticks; 2188 int ct_Count; 2189 } CTime; 2190 2191 typedef struct CHash { 2192 union { 2193 struct in_addr c4_Addr; 2194 struct in6_addr c6_Addr; 2195 } cu_Addr; 2196 #define ch_Addr4 cu_Addr.c4_Addr 2197 #define ch_Addr6 cu_Addr.c6_Addr 2198 int ch_Family; 2199 time_t ch_LTime; 2200 char *ch_Service; 2201 CTime ch_Times[CHTSIZE]; 2202 } CHash; 2203 2204 static CHash CHashAry[CPMHSIZE]; 2205 2206 static int 2207 cpmip(const struct servtab *sep, int ctrl) 2208 { 2209 struct sockaddr_storage rss; 2210 socklen_t rssLen = sizeof(rss); 2211 int r = 0; 2212 2213 /* 2214 * If getpeername() fails, just let it through (if logging is 2215 * enabled the condition is caught elsewhere) 2216 */ 2217 2218 if (sep->se_maxcpm > 0 && 2219 (sep->se_family == AF_INET || sep->se_family == AF_INET6) && 2220 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2221 time_t t = time(NULL); 2222 unsigned int hv = 0xABC3D20F; 2223 int i; 2224 int cnt = 0; 2225 CHash *chBest = NULL; 2226 unsigned int ticks = t / CHTGRAN; 2227 struct sockaddr_in *sin4; 2228 #ifdef INET6 2229 struct sockaddr_in6 *sin6; 2230 #endif 2231 2232 sin4 = (struct sockaddr_in *)&rss; 2233 #ifdef INET6 2234 sin6 = (struct sockaddr_in6 *)&rss; 2235 #endif 2236 { 2237 char *p; 2238 int addrlen; 2239 2240 switch (rss.ss_family) { 2241 case AF_INET: 2242 p = (char *)&sin4->sin_addr; 2243 addrlen = sizeof(struct in_addr); 2244 break; 2245 #ifdef INET6 2246 case AF_INET6: 2247 p = (char *)&sin6->sin6_addr; 2248 addrlen = sizeof(struct in6_addr); 2249 break; 2250 #endif 2251 default: 2252 /* should not happen */ 2253 return -1; 2254 } 2255 2256 for (i = 0; i < addrlen; ++i, ++p) { 2257 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2258 } 2259 hv = (hv ^ (hv >> 16)); 2260 } 2261 for (i = 0; i < 5; ++i) { 2262 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2263 2264 if (rss.ss_family == AF_INET && 2265 ch->ch_Family == AF_INET && 2266 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2267 ch->ch_Service && strcmp(sep->se_service, 2268 ch->ch_Service) == 0) { 2269 chBest = ch; 2270 break; 2271 } 2272 #ifdef INET6 2273 if (rss.ss_family == AF_INET6 && 2274 ch->ch_Family == AF_INET6 && 2275 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2276 &ch->ch_Addr6) != 0 && 2277 ch->ch_Service && strcmp(sep->se_service, 2278 ch->ch_Service) == 0) { 2279 chBest = ch; 2280 break; 2281 } 2282 #endif 2283 if (chBest == NULL || ch->ch_LTime == 0 || 2284 ch->ch_LTime < chBest->ch_LTime) { 2285 chBest = ch; 2286 } 2287 } 2288 if ((rss.ss_family == AF_INET && 2289 (chBest->ch_Family != AF_INET || 2290 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2291 chBest->ch_Service == NULL || 2292 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2293 chBest->ch_Family = sin4->sin_family; 2294 chBest->ch_Addr4 = sin4->sin_addr; 2295 free(chBest->ch_Service); 2296 chBest->ch_Service = strdup(sep->se_service); 2297 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times)); 2298 } 2299 #ifdef INET6 2300 if ((rss.ss_family == AF_INET6 && 2301 (chBest->ch_Family != AF_INET6 || 2302 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2303 &chBest->ch_Addr6) == 0)) || 2304 chBest->ch_Service == NULL || 2305 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2306 chBest->ch_Family = sin6->sin6_family; 2307 chBest->ch_Addr6 = sin6->sin6_addr; 2308 free(chBest->ch_Service); 2309 chBest->ch_Service = strdup(sep->se_service); 2310 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times)); 2311 } 2312 #endif 2313 chBest->ch_LTime = t; 2314 { 2315 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2316 if (ct->ct_Ticks != ticks) { 2317 ct->ct_Ticks = ticks; 2318 ct->ct_Count = 0; 2319 } 2320 ++ct->ct_Count; 2321 } 2322 for (i = 0; i < CHTSIZE; ++i) { 2323 CTime *ct = &chBest->ch_Times[i]; 2324 if (ct->ct_Ticks <= ticks && 2325 ct->ct_Ticks >= ticks - CHTSIZE) { 2326 cnt += ct->ct_Count; 2327 } 2328 } 2329 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2330 char pname[NI_MAXHOST]; 2331 2332 getnameinfo((struct sockaddr *)&rss, 2333 ((struct sockaddr *)&rss)->sa_len, 2334 pname, sizeof(pname), NULL, 0, 2335 NI_NUMERICHOST); 2336 r = -1; 2337 syslog(LOG_ERR, 2338 "%s from %s exceeded counts/min (limit %d/min)", 2339 sep->se_service, pname, 2340 sep->se_maxcpm); 2341 } 2342 } 2343 return(r); 2344 } 2345 2346 static struct conninfo * 2347 search_conn(struct servtab *sep, int ctrl) 2348 { 2349 struct sockaddr_storage ss; 2350 socklen_t sslen = sizeof(ss); 2351 struct conninfo *conn; 2352 int hv; 2353 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2354 2355 if (sep->se_maxperip <= 0) 2356 return NULL; 2357 2358 /* 2359 * If getpeername() fails, just let it through (if logging is 2360 * enabled the condition is caught elsewhere) 2361 */ 2362 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2363 return NULL; 2364 2365 switch (ss.ss_family) { 2366 case AF_INET: 2367 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2368 sizeof(struct in_addr)); 2369 break; 2370 #ifdef INET6 2371 case AF_INET6: 2372 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2373 sizeof(struct in6_addr)); 2374 break; 2375 #endif 2376 default: 2377 /* 2378 * Since we only support AF_INET and AF_INET6, just 2379 * let other than AF_INET and AF_INET6 through. 2380 */ 2381 return NULL; 2382 } 2383 2384 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2385 NULL, 0, NI_NUMERICHOST) != 0) 2386 return NULL; 2387 2388 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2389 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2390 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2391 NI_NUMERICHOST) == 0 && 2392 strcmp(pname, pname2) == 0) 2393 break; 2394 } 2395 2396 if (conn == NULL) { 2397 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2398 syslog(LOG_ERR, "malloc: %m"); 2399 exit(EX_OSERR); 2400 } 2401 conn->co_proc = reallocarray(NULL, sep->se_maxperip, 2402 sizeof(*conn->co_proc)); 2403 if (conn->co_proc == NULL) { 2404 syslog(LOG_ERR, "reallocarray: %m"); 2405 exit(EX_OSERR); 2406 } 2407 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2408 conn->co_numchild = 0; 2409 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2410 } 2411 2412 /* 2413 * Since a child process is not invoked yet, we cannot 2414 * determine a pid of a child. So, co_proc and co_numchild 2415 * should be filled leter. 2416 */ 2417 2418 return conn; 2419 } 2420 2421 static int 2422 room_conn(struct servtab *sep, struct conninfo *conn) 2423 { 2424 char pname[NI_MAXHOST]; 2425 2426 if (conn->co_numchild >= sep->se_maxperip) { 2427 getnameinfo((struct sockaddr *)&conn->co_addr, 2428 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2429 NI_NUMERICHOST); 2430 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2431 sep->se_service, pname, sep->se_maxperip); 2432 return 0; 2433 } 2434 return 1; 2435 } 2436 2437 static void 2438 addchild_conn(struct conninfo *conn, pid_t pid) 2439 { 2440 struct procinfo *proc; 2441 2442 if (conn == NULL) 2443 return; 2444 2445 if ((proc = search_proc(pid, 1)) != NULL) { 2446 if (proc->pr_conn != NULL) { 2447 syslog(LOG_ERR, 2448 "addchild_conn: child already on process list"); 2449 exit(EX_OSERR); 2450 } 2451 proc->pr_conn = conn; 2452 } 2453 2454 conn->co_proc[conn->co_numchild++] = proc; 2455 } 2456 2457 static void 2458 reapchild_conn(pid_t pid) 2459 { 2460 struct procinfo *proc; 2461 struct conninfo *conn; 2462 int i; 2463 2464 if ((proc = search_proc(pid, 0)) == NULL) 2465 return; 2466 if ((conn = proc->pr_conn) == NULL) 2467 return; 2468 for (i = 0; i < conn->co_numchild; ++i) 2469 if (conn->co_proc[i] == proc) { 2470 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2471 break; 2472 } 2473 free_proc(proc); 2474 free_conn(conn); 2475 } 2476 2477 static void 2478 resize_conn(struct servtab *sep, int maxpip) 2479 { 2480 struct conninfo *conn; 2481 int i, j; 2482 2483 if (sep->se_maxperip <= 0) 2484 return; 2485 if (maxpip <= 0) { 2486 free_connlist(sep); 2487 return; 2488 } 2489 for (i = 0; i < PERIPSIZE; ++i) { 2490 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2491 for (j = maxpip; j < conn->co_numchild; ++j) 2492 free_proc(conn->co_proc[j]); 2493 conn->co_proc = reallocarray(conn->co_proc, maxpip, 2494 sizeof(*conn->co_proc)); 2495 if (conn->co_proc == NULL) { 2496 syslog(LOG_ERR, "reallocarray: %m"); 2497 exit(EX_OSERR); 2498 } 2499 if (conn->co_numchild > maxpip) 2500 conn->co_numchild = maxpip; 2501 } 2502 } 2503 } 2504 2505 static void 2506 free_connlist(struct servtab *sep) 2507 { 2508 struct conninfo *conn, *conn_temp; 2509 int i, j; 2510 2511 for (i = 0; i < PERIPSIZE; ++i) { 2512 LIST_FOREACH_SAFE(conn, &sep->se_conn[i], co_link, conn_temp) { 2513 if (conn == NULL) { 2514 LIST_REMOVE(conn, co_link); 2515 continue; 2516 } 2517 for (j = 0; j < conn->co_numchild; ++j) 2518 free_proc(conn->co_proc[j]); 2519 conn->co_numchild = 0; 2520 free_conn(conn); 2521 } 2522 } 2523 } 2524 2525 static void 2526 free_conn(struct conninfo *conn) 2527 { 2528 if (conn == NULL) 2529 return; 2530 if (conn->co_numchild <= 0) { 2531 LIST_REMOVE(conn, co_link); 2532 free(conn->co_proc); 2533 free(conn); 2534 } 2535 } 2536 2537 static struct procinfo * 2538 search_proc(pid_t pid, int add) 2539 { 2540 struct procinfo *proc; 2541 int hv; 2542 2543 hv = hashval((char *)&pid, sizeof(pid)); 2544 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2545 if (proc->pr_pid == pid) 2546 break; 2547 } 2548 if (proc == NULL && add) { 2549 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2550 syslog(LOG_ERR, "malloc: %m"); 2551 exit(EX_OSERR); 2552 } 2553 proc->pr_pid = pid; 2554 proc->pr_conn = NULL; 2555 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2556 } 2557 return proc; 2558 } 2559 2560 static void 2561 free_proc(struct procinfo *proc) 2562 { 2563 if (proc == NULL) 2564 return; 2565 LIST_REMOVE(proc, pr_link); 2566 free(proc); 2567 } 2568 2569 static int 2570 hashval(char *p, int len) 2571 { 2572 unsigned int hv = 0xABC3D20F; 2573 int i; 2574 2575 for (i = 0; i < len; ++i, ++p) 2576 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2577 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2578 return hv; 2579 } 2580