1 /* 2 * Copyright (c) 1983, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * Inetd - Internet super-server 47 * 48 * This program invokes all internet services as needed. Connection-oriented 49 * services are invoked each time a connection is made, by creating a process. 50 * This process is passed the connection as file descriptor 0 and is expected 51 * to do a getpeername to find out the source host and port. 52 * 53 * Datagram oriented services are invoked when a datagram 54 * arrives; a process is created and passed a pending message 55 * on file descriptor 0. Datagram servers may either connect 56 * to their peer, freeing up the original socket for inetd 57 * to receive further messages on, or ``take over the socket'', 58 * processing all arriving datagrams and, eventually, timing 59 * out. The first type of server is said to be ``multi-threaded''; 60 * the second type of server ``single-threaded''. 61 * 62 * Inetd uses a configuration file which is read at startup 63 * and, possibly, at some later time in response to a hangup signal. 64 * The configuration file is ``free format'' with fields given in the 65 * order shown below. Continuation lines for an entry must begin with 66 * a space or tab. All fields must be present in each entry. 67 * 68 * service name must be in /etc/services 69 * or name a tcpmux service 70 * or specify a unix domain socket 71 * socket type stream/dgram/raw/rdm/seqpacket 72 * protocol tcp[4][6][/faith], udp[4][6], unix 73 * wait/nowait single-threaded/multi-threaded 74 * user[:group][/login-class] user/group/login-class to run daemon as 75 * server program full path name 76 * server program arguments maximum of MAXARGS (20) 77 * 78 * TCP services without official port numbers are handled with the 79 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 80 * requests. When a connection is made from a foreign host, the service 81 * requested is passed to tcpmux, which looks it up in the servtab list 82 * and returns the proper entry for the service. Tcpmux returns a 83 * negative reply if the service doesn't exist, otherwise the invoked 84 * server is expected to return the positive reply if the service type in 85 * inetd.conf file has the prefix "tcpmux/". If the service type has the 86 * prefix "tcpmux/+", tcpmux will return the positive reply for the 87 * process; this is for compatibility with older server code, and also 88 * allows you to invoke programs that use stdin/stdout without putting any 89 * special server code in them. Services that use tcpmux are "nowait" 90 * because they do not have a well-known port and hence cannot listen 91 * for new requests. 92 * 93 * For RPC services 94 * service name/version must be in /etc/rpc 95 * socket type stream/dgram/raw/rdm/seqpacket 96 * protocol rpc/tcp[4][6], rpc/udp[4][6] 97 * wait/nowait single-threaded/multi-threaded 98 * user[:group][/login-class] user/group/login-class to run daemon as 99 * server program full path name 100 * server program arguments maximum of MAXARGS 101 * 102 * Comment lines are indicated by a `#' in column 1. 103 * 104 * #ifdef IPSEC 105 * Comment lines that start with "#@" denote IPsec policy string, as described 106 * in ipsec_set_policy(3). This will affect all the following items in 107 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 108 * there's no IPsec policy. 109 * #endif 110 */ 111 #include <sys/param.h> 112 #include <sys/ioctl.h> 113 #include <sys/mman.h> 114 #include <sys/wait.h> 115 #include <sys/time.h> 116 #include <sys/resource.h> 117 #include <sys/stat.h> 118 #include <sys/un.h> 119 120 #include <netinet/in.h> 121 #include <netinet/tcp.h> 122 #include <arpa/inet.h> 123 #include <rpc/rpc.h> 124 #include <rpc/pmap_clnt.h> 125 126 #include <ctype.h> 127 #include <errno.h> 128 #include <err.h> 129 #include <fcntl.h> 130 #include <grp.h> 131 #include <libutil.h> 132 #include <limits.h> 133 #include <netdb.h> 134 #include <pwd.h> 135 #include <signal.h> 136 #include <stdio.h> 137 #include <stdlib.h> 138 #include <string.h> 139 #include <sysexits.h> 140 #include <syslog.h> 141 #include <tcpd.h> 142 #include <unistd.h> 143 144 #include "inetd.h" 145 #include "pathnames.h" 146 147 #ifdef IPSEC 148 #include <netipsec/ipsec.h> 149 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 150 #undef IPSEC 151 #endif 152 #endif 153 154 #ifndef LIBWRAP_ALLOW_FACILITY 155 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 156 #endif 157 #ifndef LIBWRAP_ALLOW_SEVERITY 158 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 159 #endif 160 #ifndef LIBWRAP_DENY_FACILITY 161 # define LIBWRAP_DENY_FACILITY LOG_AUTH 162 #endif 163 #ifndef LIBWRAP_DENY_SEVERITY 164 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 165 #endif 166 167 #define ISWRAP(sep) \ 168 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 169 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 170 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 171 || (sep)->se_socktype == SOCK_DGRAM)) 172 173 #ifdef LOGIN_CAP 174 #include <login_cap.h> 175 176 /* see init.c */ 177 #define RESOURCE_RC "daemon" 178 179 #endif 180 181 #ifndef MAXCHILD 182 #define MAXCHILD -1 /* maximum number of this service 183 < 0 = no limit */ 184 #endif 185 186 #ifndef MAXCPM 187 #define MAXCPM -1 /* rate limit invocations from a 188 single remote address, 189 < 0 = no limit */ 190 #endif 191 192 #ifndef MAXPERIP 193 #define MAXPERIP -1 /* maximum number of this service 194 from a single remote address, 195 < 0 = no limit */ 196 #endif 197 198 #ifndef TOOMANY 199 #define TOOMANY 256 /* don't start more than TOOMANY */ 200 #endif 201 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 202 #define RETRYTIME (60*10) /* retry after bind or server fail */ 203 #define MAX_MAXCHLD 32767 /* max allowable max children */ 204 205 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 206 207 void close_sep(struct servtab *); 208 void flag_signal(int); 209 void flag_config(int); 210 void config(void); 211 int cpmip(const struct servtab *, int); 212 void endconfig(void); 213 struct servtab *enter(struct servtab *); 214 void freeconfig(struct servtab *); 215 struct servtab *getconfigent(void); 216 int matchservent(const char *, const char *, const char *); 217 char *nextline(FILE *); 218 void addchild(struct servtab *, int); 219 void flag_reapchild(int); 220 void reapchild(void); 221 void enable(struct servtab *); 222 void disable(struct servtab *); 223 void flag_retry(int); 224 void retry(void); 225 int setconfig(void); 226 void setup(struct servtab *); 227 #ifdef IPSEC 228 void ipsecsetup(struct servtab *); 229 #endif 230 void unregisterrpc(register struct servtab *sep); 231 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 232 static int room_conn(struct servtab *sep, struct conninfo *conn); 233 static void addchild_conn(struct conninfo *conn, pid_t pid); 234 static void reapchild_conn(pid_t pid); 235 static void free_conn(struct conninfo *conn); 236 static void resize_conn(struct servtab *sep, int maxperip); 237 static void free_connlist(struct servtab *sep); 238 static void free_proc(struct procinfo *); 239 static struct procinfo *search_proc(pid_t pid, int add); 240 static int hashval(char *p, int len); 241 242 int allow_severity; 243 int deny_severity; 244 int wrap_ex = 0; 245 int wrap_bi = 0; 246 int debug = 0; 247 int dolog = 0; 248 int maxsock; /* highest-numbered descriptor */ 249 fd_set allsock; 250 int options; 251 int timingout; 252 int toomany = TOOMANY; 253 int maxchild = MAXCHILD; 254 int maxcpm = MAXCPM; 255 int maxperip = MAXPERIP; 256 struct servent *sp; 257 struct rpcent *rpc; 258 char *hostname = NULL; 259 struct sockaddr_in *bind_sa4; 260 int v4bind_ok = 0; 261 #ifdef INET6 262 struct sockaddr_in6 *bind_sa6; 263 int v6bind_ok = 0; 264 #endif 265 int signalpipe[2]; 266 #ifdef SANITY_CHECK 267 int nsock; 268 #endif 269 uid_t euid; 270 gid_t egid; 271 mode_t mask; 272 273 struct servtab *servtab; 274 275 extern struct biltin biltins[]; 276 277 const char *CONFIG = _PATH_INETDCONF; 278 const char *pid_file = _PATH_INETDPID; 279 struct pidfh *pfh = NULL; 280 281 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 282 283 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 284 285 int 286 getvalue(const char *arg, int *value, const char *whine) 287 { 288 int tmp; 289 char *p; 290 291 tmp = strtol(arg, &p, 0); 292 if (tmp < 0 || *p) { 293 syslog(LOG_ERR, whine, arg); 294 return 1; /* failure */ 295 } 296 *value = tmp; 297 return 0; /* success */ 298 } 299 300 static sa_family_t 301 whichaf(struct request_info *req) 302 { 303 struct sockaddr *sa; 304 305 sa = (struct sockaddr *)req->client->sin; 306 if (sa == NULL) 307 return AF_UNSPEC; 308 if (sa->sa_family == AF_INET6 && 309 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr)) 310 return AF_INET; 311 return sa->sa_family; 312 } 313 314 int 315 main(int argc, char **argv) 316 { 317 struct servtab *sep; 318 struct passwd *pwd; 319 struct group *grp; 320 struct sigaction sa, saalrm, sachld, sahup, sapipe; 321 int ch, dofork; 322 pid_t pid; 323 char buf[50]; 324 #ifdef LOGIN_CAP 325 login_cap_t *lc = NULL; 326 #endif 327 struct request_info req; 328 int denied; 329 char *service = NULL; 330 union { 331 struct sockaddr peer_un; 332 struct sockaddr_in peer_un4; 333 struct sockaddr_in6 peer_un6; 334 struct sockaddr_storage peer_max; 335 } p_un; 336 #define peer p_un.peer_un 337 #define peer4 p_un.peer_un4 338 #define peer6 p_un.peer_un6 339 #define peermax p_un.peer_max 340 int i; 341 struct addrinfo hints, *res; 342 const char *servname; 343 int error; 344 struct conninfo *conn; 345 346 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 347 348 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 349 switch(ch) { 350 case 'd': 351 debug = 1; 352 options |= SO_DEBUG; 353 break; 354 case 'l': 355 dolog = 1; 356 break; 357 case 'R': 358 getvalue(optarg, &toomany, 359 "-R %s: bad value for service invocation rate"); 360 break; 361 case 'c': 362 getvalue(optarg, &maxchild, 363 "-c %s: bad value for maximum children"); 364 break; 365 case 'C': 366 getvalue(optarg, &maxcpm, 367 "-C %s: bad value for maximum children/minute"); 368 break; 369 case 'a': 370 hostname = optarg; 371 break; 372 case 'p': 373 pid_file = optarg; 374 break; 375 case 's': 376 getvalue(optarg, &maxperip, 377 "-s %s: bad value for maximum children per source address"); 378 break; 379 case 'w': 380 wrap_ex++; 381 break; 382 case 'W': 383 wrap_bi++; 384 break; 385 case '?': 386 default: 387 syslog(LOG_ERR, 388 "usage: inetd [-dlwW] [-a address] [-R rate]" 389 " [-c maximum] [-C rate]" 390 " [-p pidfile] [conf-file]"); 391 exit(EX_USAGE); 392 } 393 /* 394 * Initialize Bind Addrs. 395 * When hostname is NULL, wild card bind addrs are obtained from 396 * getaddrinfo(). But getaddrinfo() requires at least one of 397 * hostname or servname is non NULL. 398 * So when hostname is NULL, set dummy value to servname. 399 * Since getaddrinfo() doesn't accept numeric servname, and 400 * we doesn't use ai_socktype of struct addrinfo returned 401 * from getaddrinfo(), we set dummy value to ai_socktype. 402 */ 403 servname = (hostname == NULL) ? "0" /* dummy */ : NULL; 404 405 bzero(&hints, sizeof(struct addrinfo)); 406 hints.ai_flags = AI_PASSIVE; 407 hints.ai_family = AF_UNSPEC; 408 hints.ai_socktype = SOCK_STREAM; /* dummy */ 409 error = getaddrinfo(hostname, servname, &hints, &res); 410 if (error != 0) { 411 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 412 if (error == EAI_SYSTEM) 413 syslog(LOG_ERR, "%s", strerror(errno)); 414 exit(EX_USAGE); 415 } 416 do { 417 if (res->ai_addr == NULL) { 418 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 419 exit(EX_USAGE); 420 } 421 switch (res->ai_addr->sa_family) { 422 case AF_INET: 423 if (v4bind_ok) 424 continue; 425 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 426 /* init port num in case servname is dummy */ 427 bind_sa4->sin_port = 0; 428 v4bind_ok = 1; 429 continue; 430 #ifdef INET6 431 case AF_INET6: 432 if (v6bind_ok) 433 continue; 434 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 435 /* init port num in case servname is dummy */ 436 bind_sa6->sin6_port = 0; 437 v6bind_ok = 1; 438 continue; 439 #endif 440 } 441 if (v4bind_ok 442 #ifdef INET6 443 && v6bind_ok 444 #endif 445 ) 446 break; 447 } while ((res = res->ai_next) != NULL); 448 if (!v4bind_ok 449 #ifdef INET6 450 && !v6bind_ok 451 #endif 452 ) { 453 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 454 exit(EX_USAGE); 455 } 456 457 euid = geteuid(); 458 egid = getegid(); 459 umask(mask = umask(0777)); 460 461 argc -= optind; 462 argv += optind; 463 464 if (argc > 0) 465 CONFIG = argv[0]; 466 if (access(CONFIG, R_OK) < 0) 467 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG); 468 if (debug == 0) { 469 pid_t otherpid; 470 471 pfh = pidfile_open(pid_file, 0600, &otherpid); 472 if (pfh == NULL) { 473 if (errno == EEXIST) { 474 syslog(LOG_ERR, "%s already running, pid: %d", 475 getprogname(), otherpid); 476 exit(EX_OSERR); 477 } 478 syslog(LOG_WARNING, "pidfile_open() failed: %m"); 479 } 480 481 if (daemon(0, 0) < 0) { 482 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 483 } 484 /* From now on we don't want syslog messages going to stderr. */ 485 closelog(); 486 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 487 /* 488 * In case somebody has started inetd manually, we need to 489 * clear the logname, so that old servers run as root do not 490 * get the user's logname.. 491 */ 492 if (setlogin("") < 0) { 493 syslog(LOG_WARNING, "cannot clear logname: %m"); 494 /* no big deal if it fails.. */ 495 } 496 if (pfh != NULL && pidfile_write(pfh) == -1) { 497 syslog(LOG_WARNING, "pidfile_write(): %m"); 498 } 499 } 500 501 if (madvise(NULL, 0, MADV_PROTECT) != 0) 502 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno)); 503 504 for (i = 0; i < PERIPSIZE; ++i) 505 LIST_INIT(&proctable[i]); 506 507 if (v4bind_ok) { 508 udpconf = getnetconfigent("udp"); 509 tcpconf = getnetconfigent("tcp"); 510 if (udpconf == NULL || tcpconf == NULL) { 511 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 512 exit(EX_USAGE); 513 } 514 } 515 #ifdef INET6 516 if (v6bind_ok) { 517 udp6conf = getnetconfigent("udp6"); 518 tcp6conf = getnetconfigent("tcp6"); 519 if (udp6conf == NULL || tcp6conf == NULL) { 520 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 521 exit(EX_USAGE); 522 } 523 } 524 #endif 525 526 sa.sa_flags = 0; 527 sigemptyset(&sa.sa_mask); 528 sigaddset(&sa.sa_mask, SIGALRM); 529 sigaddset(&sa.sa_mask, SIGCHLD); 530 sigaddset(&sa.sa_mask, SIGHUP); 531 sa.sa_handler = flag_retry; 532 sigaction(SIGALRM, &sa, &saalrm); 533 config(); 534 sa.sa_handler = flag_config; 535 sigaction(SIGHUP, &sa, &sahup); 536 sa.sa_handler = flag_reapchild; 537 sigaction(SIGCHLD, &sa, &sachld); 538 sa.sa_handler = SIG_IGN; 539 sigaction(SIGPIPE, &sa, &sapipe); 540 541 { 542 /* space for daemons to overwrite environment for ps */ 543 #define DUMMYSIZE 100 544 char dummy[DUMMYSIZE]; 545 546 (void)memset(dummy, 'x', DUMMYSIZE - 1); 547 dummy[DUMMYSIZE - 1] = '\0'; 548 (void)setenv("inetd_dummy", dummy, 1); 549 } 550 551 if (pipe(signalpipe) != 0) { 552 syslog(LOG_ERR, "pipe: %m"); 553 exit(EX_OSERR); 554 } 555 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 || 556 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) { 557 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m"); 558 exit(EX_OSERR); 559 } 560 FD_SET(signalpipe[0], &allsock); 561 #ifdef SANITY_CHECK 562 nsock++; 563 #endif 564 if (signalpipe[0] > maxsock) 565 maxsock = signalpipe[0]; 566 if (signalpipe[1] > maxsock) 567 maxsock = signalpipe[1]; 568 569 for (;;) { 570 int n, ctrl; 571 fd_set readable; 572 573 #ifdef SANITY_CHECK 574 if (nsock == 0) { 575 syslog(LOG_ERR, "%s: nsock=0", __func__); 576 exit(EX_SOFTWARE); 577 } 578 #endif 579 readable = allsock; 580 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 581 (fd_set *)0, (struct timeval *)0)) <= 0) { 582 if (n < 0 && errno != EINTR) { 583 syslog(LOG_WARNING, "select: %m"); 584 sleep(1); 585 } 586 continue; 587 } 588 /* handle any queued signal flags */ 589 if (FD_ISSET(signalpipe[0], &readable)) { 590 int nsig; 591 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 592 syslog(LOG_ERR, "ioctl: %m"); 593 exit(EX_OSERR); 594 } 595 while (--nsig >= 0) { 596 char c; 597 if (read(signalpipe[0], &c, 1) != 1) { 598 syslog(LOG_ERR, "read: %m"); 599 exit(EX_OSERR); 600 } 601 if (debug) 602 warnx("handling signal flag %c", c); 603 switch(c) { 604 case 'A': /* sigalrm */ 605 retry(); 606 break; 607 case 'C': /* sigchld */ 608 reapchild(); 609 break; 610 case 'H': /* sighup */ 611 config(); 612 break; 613 } 614 } 615 } 616 for (sep = servtab; n && sep; sep = sep->se_next) 617 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 618 n--; 619 if (debug) 620 warnx("someone wants %s", sep->se_service); 621 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 622 conn = NULL; 623 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 624 i = 1; 625 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 626 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 627 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 628 (socklen_t *)0); 629 if (debug) 630 warnx("accept, ctrl %d", ctrl); 631 if (ctrl < 0) { 632 if (errno != EINTR) 633 syslog(LOG_WARNING, 634 "accept (for %s): %m", 635 sep->se_service); 636 if (sep->se_accept && 637 sep->se_socktype == SOCK_STREAM) 638 close(ctrl); 639 continue; 640 } 641 i = 0; 642 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 643 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 644 if (ioctl(ctrl, FIONBIO, &i) < 0) 645 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 646 if (cpmip(sep, ctrl) < 0) { 647 close(ctrl); 648 continue; 649 } 650 if (dofork && 651 (conn = search_conn(sep, ctrl)) != NULL && 652 !room_conn(sep, conn)) { 653 close(ctrl); 654 continue; 655 } 656 } else 657 ctrl = sep->se_fd; 658 if (dolog && !ISWRAP(sep)) { 659 char pname[INET6_ADDRSTRLEN] = "unknown"; 660 socklen_t sl; 661 sl = sizeof peermax; 662 if (getpeername(ctrl, (struct sockaddr *) 663 &peermax, &sl)) { 664 sl = sizeof peermax; 665 if (recvfrom(ctrl, buf, sizeof(buf), 666 MSG_PEEK, 667 (struct sockaddr *)&peermax, 668 &sl) >= 0) { 669 getnameinfo((struct sockaddr *)&peermax, 670 peer.sa_len, 671 pname, sizeof(pname), 672 NULL, 0, NI_NUMERICHOST); 673 } 674 } else { 675 getnameinfo((struct sockaddr *)&peermax, 676 peer.sa_len, 677 pname, sizeof(pname), 678 NULL, 0, NI_NUMERICHOST); 679 } 680 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 681 } 682 (void) sigblock(SIGBLOCK); 683 pid = 0; 684 /* 685 * Fork for all external services, builtins which need to 686 * fork and anything we're wrapping (as wrapping might 687 * block or use hosts_options(5) twist). 688 */ 689 if (dofork) { 690 if (sep->se_count++ == 0) 691 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time); 692 else if (toomany > 0 && sep->se_count >= toomany) { 693 struct timespec now; 694 695 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now); 696 if (now.tv_sec - sep->se_time.tv_sec > 697 CNT_INTVL) { 698 sep->se_time = now; 699 sep->se_count = 1; 700 } else { 701 syslog(LOG_ERR, 702 "%s/%s server failing (looping), service terminated", 703 sep->se_service, sep->se_proto); 704 if (sep->se_accept && 705 sep->se_socktype == SOCK_STREAM) 706 close(ctrl); 707 close_sep(sep); 708 free_conn(conn); 709 sigsetmask(0L); 710 if (!timingout) { 711 timingout = 1; 712 alarm(RETRYTIME); 713 } 714 continue; 715 } 716 } 717 pid = fork(); 718 } 719 if (pid < 0) { 720 syslog(LOG_ERR, "fork: %m"); 721 if (sep->se_accept && 722 sep->se_socktype == SOCK_STREAM) 723 close(ctrl); 724 free_conn(conn); 725 sigsetmask(0L); 726 sleep(1); 727 continue; 728 } 729 if (pid) { 730 addchild_conn(conn, pid); 731 addchild(sep, pid); 732 } 733 sigsetmask(0L); 734 if (pid == 0) { 735 pidfile_close(pfh); 736 if (dofork) { 737 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 738 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 739 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 740 /* SIGPIPE reset before exec */ 741 } 742 /* 743 * Call tcpmux to find the real service to exec. 744 */ 745 if (sep->se_bi && 746 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 747 sep = tcpmux(ctrl); 748 if (sep == NULL) { 749 close(ctrl); 750 _exit(0); 751 } 752 } 753 if (ISWRAP(sep)) { 754 inetd_setproctitle("wrapping", ctrl); 755 service = sep->se_server_name ? 756 sep->se_server_name : sep->se_service; 757 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0); 758 fromhost(&req); 759 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 760 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 761 denied = !hosts_access(&req); 762 if (denied) { 763 syslog(deny_severity, 764 "refused connection from %.500s, service %s (%s%s)", 765 eval_client(&req), service, sep->se_proto, 766 (whichaf(&req) == AF_INET6) ? "6" : ""); 767 if (sep->se_socktype != SOCK_STREAM) 768 recv(ctrl, buf, sizeof (buf), 0); 769 if (dofork) { 770 sleep(1); 771 _exit(0); 772 } 773 } 774 if (dolog) { 775 syslog(allow_severity, 776 "connection from %.500s, service %s (%s%s)", 777 eval_client(&req), service, sep->se_proto, 778 (whichaf(&req) == AF_INET6) ? "6" : ""); 779 } 780 } 781 if (sep->se_bi) { 782 (*sep->se_bi->bi_fn)(ctrl, sep); 783 } else { 784 if (debug) 785 warnx("%d execl %s", 786 getpid(), sep->se_server); 787 /* Clear close-on-exec. */ 788 if (fcntl(ctrl, F_SETFD, 0) < 0) { 789 syslog(LOG_ERR, 790 "%s/%s: fcntl (F_SETFD, 0): %m", 791 sep->se_service, sep->se_proto); 792 _exit(EX_OSERR); 793 } 794 if (ctrl != 0) { 795 dup2(ctrl, 0); 796 close(ctrl); 797 } 798 dup2(0, 1); 799 dup2(0, 2); 800 if ((pwd = getpwnam(sep->se_user)) == NULL) { 801 syslog(LOG_ERR, 802 "%s/%s: %s: no such user", 803 sep->se_service, sep->se_proto, 804 sep->se_user); 805 if (sep->se_socktype != SOCK_STREAM) 806 recv(0, buf, sizeof (buf), 0); 807 _exit(EX_NOUSER); 808 } 809 grp = NULL; 810 if ( sep->se_group != NULL 811 && (grp = getgrnam(sep->se_group)) == NULL 812 ) { 813 syslog(LOG_ERR, 814 "%s/%s: %s: no such group", 815 sep->se_service, sep->se_proto, 816 sep->se_group); 817 if (sep->se_socktype != SOCK_STREAM) 818 recv(0, buf, sizeof (buf), 0); 819 _exit(EX_NOUSER); 820 } 821 if (grp != NULL) 822 pwd->pw_gid = grp->gr_gid; 823 #ifdef LOGIN_CAP 824 if ((lc = login_getclass(sep->se_class)) == NULL) { 825 /* error syslogged by getclass */ 826 syslog(LOG_ERR, 827 "%s/%s: %s: login class error", 828 sep->se_service, sep->se_proto, 829 sep->se_class); 830 if (sep->se_socktype != SOCK_STREAM) 831 recv(0, buf, sizeof (buf), 0); 832 _exit(EX_NOUSER); 833 } 834 #endif 835 if (setsid() < 0) { 836 syslog(LOG_ERR, 837 "%s: can't setsid(): %m", 838 sep->se_service); 839 /* _exit(EX_OSERR); not fatal yet */ 840 } 841 #ifdef LOGIN_CAP 842 if (setusercontext(lc, pwd, pwd->pw_uid, 843 LOGIN_SETALL & ~LOGIN_SETMAC) 844 != 0) { 845 syslog(LOG_ERR, 846 "%s: can't setusercontext(..%s..): %m", 847 sep->se_service, sep->se_user); 848 _exit(EX_OSERR); 849 } 850 login_close(lc); 851 #else 852 if (pwd->pw_uid) { 853 if (setlogin(sep->se_user) < 0) { 854 syslog(LOG_ERR, 855 "%s: can't setlogin(%s): %m", 856 sep->se_service, sep->se_user); 857 /* _exit(EX_OSERR); not yet */ 858 } 859 if (setgid(pwd->pw_gid) < 0) { 860 syslog(LOG_ERR, 861 "%s: can't set gid %d: %m", 862 sep->se_service, pwd->pw_gid); 863 _exit(EX_OSERR); 864 } 865 (void) initgroups(pwd->pw_name, 866 pwd->pw_gid); 867 if (setuid(pwd->pw_uid) < 0) { 868 syslog(LOG_ERR, 869 "%s: can't set uid %d: %m", 870 sep->se_service, pwd->pw_uid); 871 _exit(EX_OSERR); 872 } 873 } 874 #endif 875 sigaction(SIGPIPE, &sapipe, 876 (struct sigaction *)0); 877 execv(sep->se_server, sep->se_argv); 878 syslog(LOG_ERR, 879 "cannot execute %s: %m", sep->se_server); 880 if (sep->se_socktype != SOCK_STREAM) 881 recv(0, buf, sizeof (buf), 0); 882 } 883 if (dofork) 884 _exit(0); 885 } 886 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 887 close(ctrl); 888 } 889 } 890 } 891 892 /* 893 * Add a signal flag to the signal flag queue for later handling 894 */ 895 896 void 897 flag_signal(int c) 898 { 899 char ch = c; 900 901 if (write(signalpipe[1], &ch, 1) != 1) { 902 syslog(LOG_ERR, "write: %m"); 903 _exit(EX_OSERR); 904 } 905 } 906 907 /* 908 * Record a new child pid for this service. If we've reached the 909 * limit on children, then stop accepting incoming requests. 910 */ 911 912 void 913 addchild(struct servtab *sep, pid_t pid) 914 { 915 if (sep->se_maxchild <= 0) 916 return; 917 #ifdef SANITY_CHECK 918 if (sep->se_numchild >= sep->se_maxchild) { 919 syslog(LOG_ERR, "%s: %d >= %d", 920 __func__, sep->se_numchild, sep->se_maxchild); 921 exit(EX_SOFTWARE); 922 } 923 #endif 924 sep->se_pids[sep->se_numchild++] = pid; 925 if (sep->se_numchild == sep->se_maxchild) 926 disable(sep); 927 } 928 929 /* 930 * Some child process has exited. See if it's on somebody's list. 931 */ 932 933 void 934 flag_reapchild(int signo __unused) 935 { 936 flag_signal('C'); 937 } 938 939 void 940 reapchild(void) 941 { 942 int k, status; 943 pid_t pid; 944 struct servtab *sep; 945 946 for (;;) { 947 pid = wait3(&status, WNOHANG, (struct rusage *)0); 948 if (pid <= 0) 949 break; 950 if (debug) 951 warnx("%d reaped, %s %u", pid, 952 WIFEXITED(status) ? "status" : "signal", 953 WIFEXITED(status) ? WEXITSTATUS(status) 954 : WTERMSIG(status)); 955 for (sep = servtab; sep; sep = sep->se_next) { 956 for (k = 0; k < sep->se_numchild; k++) 957 if (sep->se_pids[k] == pid) 958 break; 959 if (k == sep->se_numchild) 960 continue; 961 if (sep->se_numchild == sep->se_maxchild) 962 enable(sep); 963 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 964 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 965 syslog(LOG_WARNING, 966 "%s[%d]: exited, %s %u", 967 sep->se_server, pid, 968 WIFEXITED(status) ? "status" : "signal", 969 WIFEXITED(status) ? WEXITSTATUS(status) 970 : WTERMSIG(status)); 971 break; 972 } 973 reapchild_conn(pid); 974 } 975 } 976 977 void 978 flag_config(int signo __unused) 979 { 980 flag_signal('H'); 981 } 982 983 void 984 config(void) 985 { 986 struct servtab *sep, *new, **sepp; 987 long omask; 988 int new_nomapped; 989 #ifdef LOGIN_CAP 990 login_cap_t *lc = NULL; 991 #endif 992 993 if (!setconfig()) { 994 syslog(LOG_ERR, "%s: %m", CONFIG); 995 return; 996 } 997 for (sep = servtab; sep; sep = sep->se_next) 998 sep->se_checked = 0; 999 while ((new = getconfigent())) { 1000 if (getpwnam(new->se_user) == NULL) { 1001 syslog(LOG_ERR, 1002 "%s/%s: no such user '%s', service ignored", 1003 new->se_service, new->se_proto, new->se_user); 1004 continue; 1005 } 1006 if (new->se_group && getgrnam(new->se_group) == NULL) { 1007 syslog(LOG_ERR, 1008 "%s/%s: no such group '%s', service ignored", 1009 new->se_service, new->se_proto, new->se_group); 1010 continue; 1011 } 1012 #ifdef LOGIN_CAP 1013 if ((lc = login_getclass(new->se_class)) == NULL) { 1014 /* error syslogged by getclass */ 1015 syslog(LOG_ERR, 1016 "%s/%s: %s: login class error, service ignored", 1017 new->se_service, new->se_proto, new->se_class); 1018 continue; 1019 } 1020 login_close(lc); 1021 #endif 1022 new_nomapped = new->se_nomapped; 1023 for (sep = servtab; sep; sep = sep->se_next) 1024 if (strcmp(sep->se_service, new->se_service) == 0 && 1025 strcmp(sep->se_proto, new->se_proto) == 0 && 1026 sep->se_rpc == new->se_rpc && 1027 sep->se_socktype == new->se_socktype && 1028 sep->se_family == new->se_family) 1029 break; 1030 if (sep != 0) { 1031 int i; 1032 1033 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 1034 omask = sigblock(SIGBLOCK); 1035 if (sep->se_nomapped != new->se_nomapped) { 1036 /* for rpc keep old nommaped till unregister */ 1037 if (!sep->se_rpc) 1038 sep->se_nomapped = new->se_nomapped; 1039 sep->se_reset = 1; 1040 } 1041 /* copy over outstanding child pids */ 1042 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1043 new->se_numchild = sep->se_numchild; 1044 if (new->se_numchild > new->se_maxchild) 1045 new->se_numchild = new->se_maxchild; 1046 memcpy(new->se_pids, sep->se_pids, 1047 new->se_numchild * sizeof(*new->se_pids)); 1048 } 1049 SWAP(pid_t *, sep->se_pids, new->se_pids); 1050 sep->se_maxchild = new->se_maxchild; 1051 sep->se_numchild = new->se_numchild; 1052 sep->se_maxcpm = new->se_maxcpm; 1053 resize_conn(sep, new->se_maxperip); 1054 sep->se_maxperip = new->se_maxperip; 1055 sep->se_bi = new->se_bi; 1056 /* might need to turn on or off service now */ 1057 if (sep->se_fd >= 0) { 1058 if (sep->se_maxchild > 0 1059 && sep->se_numchild == sep->se_maxchild) { 1060 if (FD_ISSET(sep->se_fd, &allsock)) 1061 disable(sep); 1062 } else { 1063 if (!FD_ISSET(sep->se_fd, &allsock)) 1064 enable(sep); 1065 } 1066 } 1067 sep->se_accept = new->se_accept; 1068 SWAP(char *, sep->se_user, new->se_user); 1069 SWAP(char *, sep->se_group, new->se_group); 1070 #ifdef LOGIN_CAP 1071 SWAP(char *, sep->se_class, new->se_class); 1072 #endif 1073 SWAP(char *, sep->se_server, new->se_server); 1074 SWAP(char *, sep->se_server_name, new->se_server_name); 1075 for (i = 0; i < MAXARGV; i++) 1076 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1077 #ifdef IPSEC 1078 SWAP(char *, sep->se_policy, new->se_policy); 1079 ipsecsetup(sep); 1080 #endif 1081 sigsetmask(omask); 1082 freeconfig(new); 1083 if (debug) 1084 print_service("REDO", sep); 1085 } else { 1086 sep = enter(new); 1087 if (debug) 1088 print_service("ADD ", sep); 1089 } 1090 sep->se_checked = 1; 1091 if (ISMUX(sep)) { 1092 sep->se_fd = -1; 1093 continue; 1094 } 1095 switch (sep->se_family) { 1096 case AF_INET: 1097 if (!v4bind_ok) { 1098 sep->se_fd = -1; 1099 continue; 1100 } 1101 break; 1102 #ifdef INET6 1103 case AF_INET6: 1104 if (!v6bind_ok) { 1105 sep->se_fd = -1; 1106 continue; 1107 } 1108 break; 1109 #endif 1110 } 1111 if (!sep->se_rpc) { 1112 if (sep->se_family != AF_UNIX) { 1113 sp = getservbyname(sep->se_service, sep->se_proto); 1114 if (sp == 0) { 1115 syslog(LOG_ERR, "%s/%s: unknown service", 1116 sep->se_service, sep->se_proto); 1117 sep->se_checked = 0; 1118 continue; 1119 } 1120 } 1121 switch (sep->se_family) { 1122 case AF_INET: 1123 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1124 sep->se_ctrladdr4.sin_port = 1125 sp->s_port; 1126 sep->se_reset = 1; 1127 } 1128 break; 1129 #ifdef INET6 1130 case AF_INET6: 1131 if (sp->s_port != 1132 sep->se_ctrladdr6.sin6_port) { 1133 sep->se_ctrladdr6.sin6_port = 1134 sp->s_port; 1135 sep->se_reset = 1; 1136 } 1137 break; 1138 #endif 1139 } 1140 if (sep->se_reset != 0 && sep->se_fd >= 0) 1141 close_sep(sep); 1142 } else { 1143 rpc = getrpcbyname(sep->se_service); 1144 if (rpc == 0) { 1145 syslog(LOG_ERR, "%s/%s unknown RPC service", 1146 sep->se_service, sep->se_proto); 1147 if (sep->se_fd != -1) 1148 (void) close(sep->se_fd); 1149 sep->se_fd = -1; 1150 continue; 1151 } 1152 if (sep->se_reset != 0 || 1153 rpc->r_number != sep->se_rpc_prog) { 1154 if (sep->se_rpc_prog) 1155 unregisterrpc(sep); 1156 sep->se_rpc_prog = rpc->r_number; 1157 if (sep->se_fd != -1) 1158 (void) close(sep->se_fd); 1159 sep->se_fd = -1; 1160 } 1161 sep->se_nomapped = new_nomapped; 1162 } 1163 sep->se_reset = 0; 1164 if (sep->se_fd == -1) 1165 setup(sep); 1166 } 1167 endconfig(); 1168 /* 1169 * Purge anything not looked at above. 1170 */ 1171 omask = sigblock(SIGBLOCK); 1172 sepp = &servtab; 1173 while ((sep = *sepp)) { 1174 if (sep->se_checked) { 1175 sepp = &sep->se_next; 1176 continue; 1177 } 1178 *sepp = sep->se_next; 1179 if (sep->se_fd >= 0) 1180 close_sep(sep); 1181 if (debug) 1182 print_service("FREE", sep); 1183 if (sep->se_rpc && sep->se_rpc_prog > 0) 1184 unregisterrpc(sep); 1185 freeconfig(sep); 1186 free(sep); 1187 } 1188 (void) sigsetmask(omask); 1189 } 1190 1191 void 1192 unregisterrpc(struct servtab *sep) 1193 { 1194 u_int i; 1195 struct servtab *sepp; 1196 long omask; 1197 struct netconfig *netid4, *netid6; 1198 1199 omask = sigblock(SIGBLOCK); 1200 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1201 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1202 if (sep->se_family == AF_INET) 1203 netid6 = NULL; 1204 else if (sep->se_nomapped) 1205 netid4 = NULL; 1206 /* 1207 * Conflict if same prog and protocol - In that case one should look 1208 * to versions, but it is not interesting: having separate servers for 1209 * different versions does not work well. 1210 * Therefore one do not unregister if there is a conflict. 1211 * There is also transport conflict if destroying INET when INET46 1212 * exists, or destroying INET46 when INET exists 1213 */ 1214 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1215 if (sepp == sep) 1216 continue; 1217 if (sepp->se_checked == 0 || 1218 !sepp->se_rpc || 1219 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1220 sep->se_rpc_prog != sepp->se_rpc_prog) 1221 continue; 1222 if (sepp->se_family == AF_INET) 1223 netid4 = NULL; 1224 if (sepp->se_family == AF_INET6) { 1225 netid6 = NULL; 1226 if (!sep->se_nomapped) 1227 netid4 = NULL; 1228 } 1229 if (netid4 == NULL && netid6 == NULL) 1230 return; 1231 } 1232 if (debug) 1233 print_service("UNREG", sep); 1234 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1235 if (netid4) 1236 rpcb_unset(sep->se_rpc_prog, i, netid4); 1237 if (netid6) 1238 rpcb_unset(sep->se_rpc_prog, i, netid6); 1239 } 1240 if (sep->se_fd != -1) 1241 (void) close(sep->se_fd); 1242 sep->se_fd = -1; 1243 (void) sigsetmask(omask); 1244 } 1245 1246 void 1247 flag_retry(int signo __unused) 1248 { 1249 flag_signal('A'); 1250 } 1251 1252 void 1253 retry(void) 1254 { 1255 struct servtab *sep; 1256 1257 timingout = 0; 1258 for (sep = servtab; sep; sep = sep->se_next) 1259 if (sep->se_fd == -1 && !ISMUX(sep)) 1260 setup(sep); 1261 } 1262 1263 void 1264 setup(struct servtab *sep) 1265 { 1266 int on = 1; 1267 1268 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1269 if (debug) 1270 warn("socket failed on %s/%s", 1271 sep->se_service, sep->se_proto); 1272 syslog(LOG_ERR, "%s/%s: socket: %m", 1273 sep->se_service, sep->se_proto); 1274 return; 1275 } 1276 /* Set all listening sockets to close-on-exec. */ 1277 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1278 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m", 1279 sep->se_service, sep->se_proto); 1280 close(sep->se_fd); 1281 return; 1282 } 1283 #define turnon(fd, opt) \ 1284 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1285 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1286 turnon(sep->se_fd, SO_DEBUG) < 0) 1287 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1288 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1289 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1290 #ifdef SO_PRIVSTATE 1291 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1292 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1293 #endif 1294 /* tftpd opens a new connection then needs more infos */ 1295 if ((sep->se_family == AF_INET6) && 1296 (strcmp(sep->se_proto, "udp") == 0) && 1297 (sep->se_accept == 0) && 1298 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1299 (char *)&on, sizeof (on)) < 0)) 1300 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1301 if (sep->se_family == AF_INET6) { 1302 int flag = sep->se_nomapped ? 1 : 0; 1303 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1304 (char *)&flag, sizeof (flag)) < 0) 1305 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1306 } 1307 #undef turnon 1308 #ifdef IPV6_FAITH 1309 if (sep->se_type == FAITH_TYPE) { 1310 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1311 sizeof(on)) < 0) { 1312 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1313 } 1314 } 1315 #endif 1316 #ifdef IPSEC 1317 ipsecsetup(sep); 1318 #endif 1319 if (sep->se_family == AF_UNIX) { 1320 (void) unlink(sep->se_ctrladdr_un.sun_path); 1321 umask(0777); /* Make socket with conservative permissions */ 1322 } 1323 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1324 sep->se_ctrladdr_size) < 0) { 1325 if (debug) 1326 warn("bind failed on %s/%s", 1327 sep->se_service, sep->se_proto); 1328 syslog(LOG_ERR, "%s/%s: bind: %m", 1329 sep->se_service, sep->se_proto); 1330 (void) close(sep->se_fd); 1331 sep->se_fd = -1; 1332 if (!timingout) { 1333 timingout = 1; 1334 alarm(RETRYTIME); 1335 } 1336 if (sep->se_family == AF_UNIX) 1337 umask(mask); 1338 return; 1339 } 1340 if (sep->se_family == AF_UNIX) { 1341 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1342 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1343 syslog(LOG_ERR, "chown socket: %m"); 1344 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1345 syslog(LOG_ERR, "chmod socket: %m"); 1346 umask(mask); 1347 } 1348 if (sep->se_rpc) { 1349 u_int i; 1350 socklen_t len = sep->se_ctrladdr_size; 1351 struct netconfig *netid, *netid2 = NULL; 1352 struct sockaddr_in sock; 1353 struct netbuf nbuf, nbuf2; 1354 1355 if (getsockname(sep->se_fd, 1356 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1357 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1358 sep->se_service, sep->se_proto); 1359 (void) close(sep->se_fd); 1360 sep->se_fd = -1; 1361 return; 1362 } 1363 nbuf.buf = &sep->se_ctrladdr; 1364 nbuf.len = sep->se_ctrladdr.sa_len; 1365 if (sep->se_family == AF_INET) 1366 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1367 else { 1368 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1369 if (!sep->se_nomapped) { /* INET and INET6 */ 1370 netid2 = netid==udp6conf? udpconf:tcpconf; 1371 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1372 nbuf2.buf = &sock; 1373 nbuf2.len = sock.sin_len = sizeof sock; 1374 sock.sin_family = AF_INET; 1375 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1376 } 1377 } 1378 if (debug) 1379 print_service("REG ", sep); 1380 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1381 rpcb_unset(sep->se_rpc_prog, i, netid); 1382 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1383 if (netid2) { 1384 rpcb_unset(sep->se_rpc_prog, i, netid2); 1385 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1386 } 1387 } 1388 } 1389 if (sep->se_socktype == SOCK_STREAM) 1390 listen(sep->se_fd, -1); 1391 enable(sep); 1392 if (debug) { 1393 warnx("registered %s on %d", 1394 sep->se_server, sep->se_fd); 1395 } 1396 } 1397 1398 #ifdef IPSEC 1399 void 1400 ipsecsetup(struct servtab *sep) 1401 { 1402 char *buf; 1403 char *policy_in = NULL; 1404 char *policy_out = NULL; 1405 int level; 1406 int opt; 1407 1408 switch (sep->se_family) { 1409 case AF_INET: 1410 level = IPPROTO_IP; 1411 opt = IP_IPSEC_POLICY; 1412 break; 1413 #ifdef INET6 1414 case AF_INET6: 1415 level = IPPROTO_IPV6; 1416 opt = IPV6_IPSEC_POLICY; 1417 break; 1418 #endif 1419 default: 1420 return; 1421 } 1422 1423 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1424 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1425 policy_in = def_in; 1426 policy_out = def_out; 1427 } else { 1428 if (!strncmp("in", sep->se_policy, 2)) 1429 policy_in = sep->se_policy; 1430 else if (!strncmp("out", sep->se_policy, 3)) 1431 policy_out = sep->se_policy; 1432 else { 1433 syslog(LOG_ERR, "invalid security policy \"%s\"", 1434 sep->se_policy); 1435 return; 1436 } 1437 } 1438 1439 if (policy_in != NULL) { 1440 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1441 if (buf != NULL) { 1442 if (setsockopt(sep->se_fd, level, opt, 1443 buf, ipsec_get_policylen(buf)) < 0 && 1444 debug != 0) 1445 warnx("%s/%s: ipsec initialization failed; %s", 1446 sep->se_service, sep->se_proto, 1447 policy_in); 1448 free(buf); 1449 } else 1450 syslog(LOG_ERR, "invalid security policy \"%s\"", 1451 policy_in); 1452 } 1453 if (policy_out != NULL) { 1454 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1455 if (buf != NULL) { 1456 if (setsockopt(sep->se_fd, level, opt, 1457 buf, ipsec_get_policylen(buf)) < 0 && 1458 debug != 0) 1459 warnx("%s/%s: ipsec initialization failed; %s", 1460 sep->se_service, sep->se_proto, 1461 policy_out); 1462 free(buf); 1463 } else 1464 syslog(LOG_ERR, "invalid security policy \"%s\"", 1465 policy_out); 1466 } 1467 } 1468 #endif 1469 1470 /* 1471 * Finish with a service and its socket. 1472 */ 1473 void 1474 close_sep(struct servtab *sep) 1475 { 1476 if (sep->se_fd >= 0) { 1477 if (FD_ISSET(sep->se_fd, &allsock)) 1478 disable(sep); 1479 (void) close(sep->se_fd); 1480 sep->se_fd = -1; 1481 } 1482 sep->se_count = 0; 1483 sep->se_numchild = 0; /* forget about any existing children */ 1484 } 1485 1486 int 1487 matchservent(const char *name1, const char *name2, const char *proto) 1488 { 1489 char **alias, *p; 1490 struct servent *se; 1491 1492 if (strcmp(proto, "unix") == 0) { 1493 if ((p = strrchr(name1, '/')) != NULL) 1494 name1 = p + 1; 1495 if ((p = strrchr(name2, '/')) != NULL) 1496 name2 = p + 1; 1497 } 1498 if (strcmp(name1, name2) == 0) 1499 return(1); 1500 if ((se = getservbyname(name1, proto)) != NULL) { 1501 if (strcmp(name2, se->s_name) == 0) 1502 return(1); 1503 for (alias = se->s_aliases; *alias; alias++) 1504 if (strcmp(name2, *alias) == 0) 1505 return(1); 1506 } 1507 return(0); 1508 } 1509 1510 struct servtab * 1511 enter(struct servtab *cp) 1512 { 1513 struct servtab *sep; 1514 long omask; 1515 1516 sep = (struct servtab *)malloc(sizeof (*sep)); 1517 if (sep == (struct servtab *)0) { 1518 syslog(LOG_ERR, "malloc: %m"); 1519 exit(EX_OSERR); 1520 } 1521 *sep = *cp; 1522 sep->se_fd = -1; 1523 omask = sigblock(SIGBLOCK); 1524 sep->se_next = servtab; 1525 servtab = sep; 1526 sigsetmask(omask); 1527 return (sep); 1528 } 1529 1530 void 1531 enable(struct servtab *sep) 1532 { 1533 if (debug) 1534 warnx( 1535 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1536 #ifdef SANITY_CHECK 1537 if (sep->se_fd < 0) { 1538 syslog(LOG_ERR, 1539 "%s: %s: bad fd", __func__, sep->se_service); 1540 exit(EX_SOFTWARE); 1541 } 1542 if (ISMUX(sep)) { 1543 syslog(LOG_ERR, 1544 "%s: %s: is mux", __func__, sep->se_service); 1545 exit(EX_SOFTWARE); 1546 } 1547 if (FD_ISSET(sep->se_fd, &allsock)) { 1548 syslog(LOG_ERR, 1549 "%s: %s: not off", __func__, sep->se_service); 1550 exit(EX_SOFTWARE); 1551 } 1552 nsock++; 1553 #endif 1554 FD_SET(sep->se_fd, &allsock); 1555 if (sep->se_fd > maxsock) 1556 maxsock = sep->se_fd; 1557 } 1558 1559 void 1560 disable(struct servtab *sep) 1561 { 1562 if (debug) 1563 warnx( 1564 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1565 #ifdef SANITY_CHECK 1566 if (sep->se_fd < 0) { 1567 syslog(LOG_ERR, 1568 "%s: %s: bad fd", __func__, sep->se_service); 1569 exit(EX_SOFTWARE); 1570 } 1571 if (ISMUX(sep)) { 1572 syslog(LOG_ERR, 1573 "%s: %s: is mux", __func__, sep->se_service); 1574 exit(EX_SOFTWARE); 1575 } 1576 if (!FD_ISSET(sep->se_fd, &allsock)) { 1577 syslog(LOG_ERR, 1578 "%s: %s: not on", __func__, sep->se_service); 1579 exit(EX_SOFTWARE); 1580 } 1581 if (nsock == 0) { 1582 syslog(LOG_ERR, "%s: nsock=0", __func__); 1583 exit(EX_SOFTWARE); 1584 } 1585 nsock--; 1586 #endif 1587 FD_CLR(sep->se_fd, &allsock); 1588 if (sep->se_fd == maxsock) 1589 maxsock--; 1590 } 1591 1592 FILE *fconfig = NULL; 1593 struct servtab serv; 1594 char line[LINE_MAX]; 1595 1596 int 1597 setconfig(void) 1598 { 1599 1600 if (fconfig != NULL) { 1601 fseek(fconfig, 0L, SEEK_SET); 1602 return (1); 1603 } 1604 fconfig = fopen(CONFIG, "r"); 1605 return (fconfig != NULL); 1606 } 1607 1608 void 1609 endconfig(void) 1610 { 1611 if (fconfig) { 1612 (void) fclose(fconfig); 1613 fconfig = NULL; 1614 } 1615 } 1616 1617 struct servtab * 1618 getconfigent(void) 1619 { 1620 struct servtab *sep = &serv; 1621 int argc; 1622 char *cp, *arg, *s; 1623 char *versp; 1624 static char TCPMUX_TOKEN[] = "tcpmux/"; 1625 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1626 #ifdef IPSEC 1627 char *policy; 1628 #endif 1629 int v4bind; 1630 #ifdef INET6 1631 int v6bind; 1632 #endif 1633 int i; 1634 1635 #ifdef IPSEC 1636 policy = NULL; 1637 #endif 1638 more: 1639 v4bind = 0; 1640 #ifdef INET6 1641 v6bind = 0; 1642 #endif 1643 while ((cp = nextline(fconfig)) != NULL) { 1644 #ifdef IPSEC 1645 /* lines starting with #@ is not a comment, but the policy */ 1646 if (cp[0] == '#' && cp[1] == '@') { 1647 char *p; 1648 for (p = cp + 2; p && *p && isspace(*p); p++) 1649 ; 1650 if (*p == '\0') { 1651 if (policy) 1652 free(policy); 1653 policy = NULL; 1654 } else if (ipsec_get_policylen(p) >= 0) { 1655 if (policy) 1656 free(policy); 1657 policy = newstr(p); 1658 } else { 1659 syslog(LOG_ERR, 1660 "%s: invalid ipsec policy \"%s\"", 1661 CONFIG, p); 1662 exit(EX_CONFIG); 1663 } 1664 } 1665 #endif 1666 if (*cp == '#' || *cp == '\0') 1667 continue; 1668 break; 1669 } 1670 if (cp == NULL) 1671 return ((struct servtab *)0); 1672 /* 1673 * clear the static buffer, since some fields (se_ctrladdr, 1674 * for example) don't get initialized here. 1675 */ 1676 memset(sep, 0, sizeof *sep); 1677 arg = skip(&cp); 1678 if (cp == NULL) { 1679 /* got an empty line containing just blanks/tabs. */ 1680 goto more; 1681 } 1682 if (arg[0] == ':') { /* :user:group:perm: */ 1683 char *user, *group, *perm; 1684 struct passwd *pw; 1685 struct group *gr; 1686 user = arg+1; 1687 if ((group = strchr(user, ':')) == NULL) { 1688 syslog(LOG_ERR, "no group after user '%s'", user); 1689 goto more; 1690 } 1691 *group++ = '\0'; 1692 if ((perm = strchr(group, ':')) == NULL) { 1693 syslog(LOG_ERR, "no mode after group '%s'", group); 1694 goto more; 1695 } 1696 *perm++ = '\0'; 1697 if ((pw = getpwnam(user)) == NULL) { 1698 syslog(LOG_ERR, "no such user '%s'", user); 1699 goto more; 1700 } 1701 sep->se_sockuid = pw->pw_uid; 1702 if ((gr = getgrnam(group)) == NULL) { 1703 syslog(LOG_ERR, "no such user '%s'", group); 1704 goto more; 1705 } 1706 sep->se_sockgid = gr->gr_gid; 1707 sep->se_sockmode = strtol(perm, &arg, 8); 1708 if (*arg != ':') { 1709 syslog(LOG_ERR, "bad mode '%s'", perm); 1710 goto more; 1711 } 1712 *arg++ = '\0'; 1713 } else { 1714 sep->se_sockuid = euid; 1715 sep->se_sockgid = egid; 1716 sep->se_sockmode = 0200; 1717 } 1718 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1719 char *c = arg + MUX_LEN; 1720 if (*c == '+') { 1721 sep->se_type = MUXPLUS_TYPE; 1722 c++; 1723 } else 1724 sep->se_type = MUX_TYPE; 1725 sep->se_service = newstr(c); 1726 } else { 1727 sep->se_service = newstr(arg); 1728 sep->se_type = NORM_TYPE; 1729 } 1730 arg = sskip(&cp); 1731 if (strcmp(arg, "stream") == 0) 1732 sep->se_socktype = SOCK_STREAM; 1733 else if (strcmp(arg, "dgram") == 0) 1734 sep->se_socktype = SOCK_DGRAM; 1735 else if (strcmp(arg, "rdm") == 0) 1736 sep->se_socktype = SOCK_RDM; 1737 else if (strcmp(arg, "seqpacket") == 0) 1738 sep->se_socktype = SOCK_SEQPACKET; 1739 else if (strcmp(arg, "raw") == 0) 1740 sep->se_socktype = SOCK_RAW; 1741 else 1742 sep->se_socktype = -1; 1743 1744 arg = sskip(&cp); 1745 if (strncmp(arg, "tcp", 3) == 0) { 1746 sep->se_proto = newstr(strsep(&arg, "/")); 1747 if (arg != NULL) { 1748 if (strcmp(arg, "faith") == 0) 1749 sep->se_type = FAITH_TYPE; 1750 } 1751 } else { 1752 if (sep->se_type == NORM_TYPE && 1753 strncmp(arg, "faith/", 6) == 0) { 1754 arg += 6; 1755 sep->se_type = FAITH_TYPE; 1756 } 1757 sep->se_proto = newstr(arg); 1758 } 1759 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1760 memmove(sep->se_proto, sep->se_proto + 4, 1761 strlen(sep->se_proto) + 1 - 4); 1762 sep->se_rpc = 1; 1763 sep->se_rpc_prog = sep->se_rpc_lowvers = 1764 sep->se_rpc_lowvers = 0; 1765 memcpy(&sep->se_ctrladdr4, bind_sa4, 1766 sizeof(sep->se_ctrladdr4)); 1767 if ((versp = strrchr(sep->se_service, '/'))) { 1768 *versp++ = '\0'; 1769 switch (sscanf(versp, "%u-%u", 1770 &sep->se_rpc_lowvers, 1771 &sep->se_rpc_highvers)) { 1772 case 2: 1773 break; 1774 case 1: 1775 sep->se_rpc_highvers = 1776 sep->se_rpc_lowvers; 1777 break; 1778 default: 1779 syslog(LOG_ERR, 1780 "bad RPC version specifier; %s", 1781 sep->se_service); 1782 freeconfig(sep); 1783 goto more; 1784 } 1785 } 1786 else { 1787 sep->se_rpc_lowvers = 1788 sep->se_rpc_highvers = 1; 1789 } 1790 } 1791 sep->se_nomapped = 0; 1792 if (strcmp(sep->se_proto, "unix") == 0) { 1793 sep->se_family = AF_UNIX; 1794 } else { 1795 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1796 #ifdef INET6 1797 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1798 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1799 v6bind = 1; 1800 continue; 1801 } 1802 #endif 1803 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1804 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1805 v4bind = 1; 1806 continue; 1807 } 1808 /* illegal version num */ 1809 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1810 freeconfig(sep); 1811 goto more; 1812 } 1813 #ifdef INET6 1814 if (v6bind && !v6bind_ok) { 1815 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1816 sep->se_service); 1817 if (v4bind && v4bind_ok) 1818 v6bind = 0; 1819 else { 1820 freeconfig(sep); 1821 goto more; 1822 } 1823 } 1824 if (v6bind) { 1825 sep->se_family = AF_INET6; 1826 if (!v4bind || !v4bind_ok) 1827 sep->se_nomapped = 1; 1828 } else 1829 #endif 1830 { /* default to v4 bind if not v6 bind */ 1831 if (!v4bind_ok) { 1832 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1833 sep->se_service); 1834 freeconfig(sep); 1835 goto more; 1836 } 1837 sep->se_family = AF_INET; 1838 } 1839 } 1840 /* init ctladdr */ 1841 switch(sep->se_family) { 1842 case AF_INET: 1843 memcpy(&sep->se_ctrladdr4, bind_sa4, 1844 sizeof(sep->se_ctrladdr4)); 1845 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1846 break; 1847 #ifdef INET6 1848 case AF_INET6: 1849 memcpy(&sep->se_ctrladdr6, bind_sa6, 1850 sizeof(sep->se_ctrladdr6)); 1851 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1852 break; 1853 #endif 1854 case AF_UNIX: 1855 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1856 syslog(LOG_ERR, 1857 "domain socket pathname too long for service %s", 1858 sep->se_service); 1859 goto more; 1860 } 1861 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1862 sep->se_ctrladdr_un.sun_family = sep->se_family; 1863 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1864 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1865 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1866 } 1867 arg = sskip(&cp); 1868 if (!strncmp(arg, "wait", 4)) 1869 sep->se_accept = 0; 1870 else if (!strncmp(arg, "nowait", 6)) 1871 sep->se_accept = 1; 1872 else { 1873 syslog(LOG_ERR, 1874 "%s: bad wait/nowait for service %s", 1875 CONFIG, sep->se_service); 1876 goto more; 1877 } 1878 sep->se_maxchild = -1; 1879 sep->se_maxcpm = -1; 1880 sep->se_maxperip = -1; 1881 if ((s = strchr(arg, '/')) != NULL) { 1882 char *eptr; 1883 u_long val; 1884 1885 val = strtoul(s + 1, &eptr, 10); 1886 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1887 syslog(LOG_ERR, 1888 "%s: bad max-child for service %s", 1889 CONFIG, sep->se_service); 1890 goto more; 1891 } 1892 if (debug) 1893 if (!sep->se_accept && val != 1) 1894 warnx("maxchild=%lu for wait service %s" 1895 " not recommended", val, sep->se_service); 1896 sep->se_maxchild = val; 1897 if (*eptr == '/') 1898 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1899 if (*eptr == '/') 1900 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1901 /* 1902 * explicitly do not check for \0 for future expansion / 1903 * backwards compatibility 1904 */ 1905 } 1906 if (ISMUX(sep)) { 1907 /* 1908 * Silently enforce "nowait" mode for TCPMUX services 1909 * since they don't have an assigned port to listen on. 1910 */ 1911 sep->se_accept = 1; 1912 if (strcmp(sep->se_proto, "tcp")) { 1913 syslog(LOG_ERR, 1914 "%s: bad protocol for tcpmux service %s", 1915 CONFIG, sep->se_service); 1916 goto more; 1917 } 1918 if (sep->se_socktype != SOCK_STREAM) { 1919 syslog(LOG_ERR, 1920 "%s: bad socket type for tcpmux service %s", 1921 CONFIG, sep->se_service); 1922 goto more; 1923 } 1924 } 1925 sep->se_user = newstr(sskip(&cp)); 1926 #ifdef LOGIN_CAP 1927 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1928 *s = '\0'; 1929 sep->se_class = newstr(s + 1); 1930 } else 1931 sep->se_class = newstr(RESOURCE_RC); 1932 #endif 1933 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1934 *s = '\0'; 1935 sep->se_group = newstr(s + 1); 1936 } else 1937 sep->se_group = NULL; 1938 sep->se_server = newstr(sskip(&cp)); 1939 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1940 sep->se_server_name++; 1941 if (strcmp(sep->se_server, "internal") == 0) { 1942 struct biltin *bi; 1943 1944 for (bi = biltins; bi->bi_service; bi++) 1945 if (bi->bi_socktype == sep->se_socktype && 1946 matchservent(bi->bi_service, sep->se_service, 1947 sep->se_proto)) 1948 break; 1949 if (bi->bi_service == 0) { 1950 syslog(LOG_ERR, "internal service %s unknown", 1951 sep->se_service); 1952 goto more; 1953 } 1954 sep->se_accept = 1; /* force accept mode for built-ins */ 1955 sep->se_bi = bi; 1956 } else 1957 sep->se_bi = NULL; 1958 if (sep->se_maxperip < 0) 1959 sep->se_maxperip = maxperip; 1960 if (sep->se_maxcpm < 0) 1961 sep->se_maxcpm = maxcpm; 1962 if (sep->se_maxchild < 0) { /* apply default max-children */ 1963 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1964 sep->se_maxchild = sep->se_bi->bi_maxchild; 1965 else if (sep->se_accept) 1966 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1967 else 1968 sep->se_maxchild = 1; 1969 } 1970 if (sep->se_maxchild > 0) { 1971 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1972 if (sep->se_pids == NULL) { 1973 syslog(LOG_ERR, "malloc: %m"); 1974 exit(EX_OSERR); 1975 } 1976 } 1977 argc = 0; 1978 for (arg = skip(&cp); cp; arg = skip(&cp)) 1979 if (argc < MAXARGV) { 1980 sep->se_argv[argc++] = newstr(arg); 1981 } else { 1982 syslog(LOG_ERR, 1983 "%s: too many arguments for service %s", 1984 CONFIG, sep->se_service); 1985 goto more; 1986 } 1987 while (argc <= MAXARGV) 1988 sep->se_argv[argc++] = NULL; 1989 for (i = 0; i < PERIPSIZE; ++i) 1990 LIST_INIT(&sep->se_conn[i]); 1991 #ifdef IPSEC 1992 sep->se_policy = policy ? newstr(policy) : NULL; 1993 #endif 1994 return (sep); 1995 } 1996 1997 void 1998 freeconfig(struct servtab *cp) 1999 { 2000 int i; 2001 2002 if (cp->se_service) 2003 free(cp->se_service); 2004 if (cp->se_proto) 2005 free(cp->se_proto); 2006 if (cp->se_user) 2007 free(cp->se_user); 2008 if (cp->se_group) 2009 free(cp->se_group); 2010 #ifdef LOGIN_CAP 2011 if (cp->se_class) 2012 free(cp->se_class); 2013 #endif 2014 if (cp->se_server) 2015 free(cp->se_server); 2016 if (cp->se_pids) 2017 free(cp->se_pids); 2018 for (i = 0; i < MAXARGV; i++) 2019 if (cp->se_argv[i]) 2020 free(cp->se_argv[i]); 2021 free_connlist(cp); 2022 #ifdef IPSEC 2023 if (cp->se_policy) 2024 free(cp->se_policy); 2025 #endif 2026 } 2027 2028 2029 /* 2030 * Safe skip - if skip returns null, log a syntax error in the 2031 * configuration file and exit. 2032 */ 2033 char * 2034 sskip(char **cpp) 2035 { 2036 char *cp; 2037 2038 cp = skip(cpp); 2039 if (cp == NULL) { 2040 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2041 exit(EX_DATAERR); 2042 } 2043 return (cp); 2044 } 2045 2046 char * 2047 skip(char **cpp) 2048 { 2049 char *cp = *cpp; 2050 char *start; 2051 char quote = '\0'; 2052 2053 again: 2054 while (*cp == ' ' || *cp == '\t') 2055 cp++; 2056 if (*cp == '\0') { 2057 int c; 2058 2059 c = getc(fconfig); 2060 (void) ungetc(c, fconfig); 2061 if (c == ' ' || c == '\t') 2062 if ((cp = nextline(fconfig))) 2063 goto again; 2064 *cpp = (char *)0; 2065 return ((char *)0); 2066 } 2067 if (*cp == '"' || *cp == '\'') 2068 quote = *cp++; 2069 start = cp; 2070 if (quote) 2071 while (*cp && *cp != quote) 2072 cp++; 2073 else 2074 while (*cp && *cp != ' ' && *cp != '\t') 2075 cp++; 2076 if (*cp != '\0') 2077 *cp++ = '\0'; 2078 *cpp = cp; 2079 return (start); 2080 } 2081 2082 char * 2083 nextline(FILE *fd) 2084 { 2085 char *cp; 2086 2087 if (fgets(line, sizeof (line), fd) == NULL) 2088 return ((char *)0); 2089 cp = strchr(line, '\n'); 2090 if (cp) 2091 *cp = '\0'; 2092 return (line); 2093 } 2094 2095 char * 2096 newstr(const char *cp) 2097 { 2098 char *cr; 2099 2100 if ((cr = strdup(cp != NULL ? cp : ""))) 2101 return (cr); 2102 syslog(LOG_ERR, "strdup: %m"); 2103 exit(EX_OSERR); 2104 } 2105 2106 void 2107 inetd_setproctitle(const char *a, int s) 2108 { 2109 socklen_t size; 2110 struct sockaddr_storage ss; 2111 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2112 2113 size = sizeof(ss); 2114 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2115 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2116 NULL, 0, NI_NUMERICHOST); 2117 (void) sprintf(buf, "%s [%s]", a, pbuf); 2118 } else 2119 (void) sprintf(buf, "%s", a); 2120 setproctitle("%s", buf); 2121 } 2122 2123 int 2124 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2125 { 2126 struct servtab *se2; 2127 char pname[INET6_ADDRSTRLEN]; 2128 2129 for (se2 = servtab; se2; se2 = se2->se_next) { 2130 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2131 continue; 2132 2133 switch (se2->se_family) { 2134 case AF_INET: 2135 if (((const struct sockaddr_in *)sa)->sin_port == 2136 se2->se_ctrladdr4.sin_port) 2137 goto isloop; 2138 continue; 2139 #ifdef INET6 2140 case AF_INET6: 2141 if (((const struct sockaddr_in *)sa)->sin_port == 2142 se2->se_ctrladdr4.sin_port) 2143 goto isloop; 2144 continue; 2145 #endif 2146 default: 2147 continue; 2148 } 2149 isloop: 2150 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2151 NI_NUMERICHOST); 2152 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2153 sep->se_service, sep->se_proto, 2154 se2->se_service, se2->se_proto, 2155 pname); 2156 return 1; 2157 } 2158 return 0; 2159 } 2160 2161 /* 2162 * print_service: 2163 * Dump relevant information to stderr 2164 */ 2165 void 2166 print_service(const char *action, const struct servtab *sep) 2167 { 2168 fprintf(stderr, 2169 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2170 #ifdef LOGIN_CAP 2171 "class=%s" 2172 #endif 2173 " builtin=%p server=%s" 2174 #ifdef IPSEC 2175 " policy=\"%s\"" 2176 #endif 2177 "\n", 2178 action, sep->se_service, sep->se_proto, 2179 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2180 #ifdef LOGIN_CAP 2181 sep->se_class, 2182 #endif 2183 (void *) sep->se_bi, sep->se_server 2184 #ifdef IPSEC 2185 , (sep->se_policy ? sep->se_policy : "") 2186 #endif 2187 ); 2188 } 2189 2190 #define CPMHSIZE 256 2191 #define CPMHMASK (CPMHSIZE-1) 2192 #define CHTGRAN 10 2193 #define CHTSIZE 6 2194 2195 typedef struct CTime { 2196 unsigned long ct_Ticks; 2197 int ct_Count; 2198 } CTime; 2199 2200 typedef struct CHash { 2201 union { 2202 struct in_addr c4_Addr; 2203 struct in6_addr c6_Addr; 2204 } cu_Addr; 2205 #define ch_Addr4 cu_Addr.c4_Addr 2206 #define ch_Addr6 cu_Addr.c6_Addr 2207 int ch_Family; 2208 time_t ch_LTime; 2209 char *ch_Service; 2210 CTime ch_Times[CHTSIZE]; 2211 } CHash; 2212 2213 CHash CHashAry[CPMHSIZE]; 2214 2215 int 2216 cpmip(const struct servtab *sep, int ctrl) 2217 { 2218 struct sockaddr_storage rss; 2219 socklen_t rssLen = sizeof(rss); 2220 int r = 0; 2221 2222 /* 2223 * If getpeername() fails, just let it through (if logging is 2224 * enabled the condition is caught elsewhere) 2225 */ 2226 2227 if (sep->se_maxcpm > 0 && 2228 (sep->se_family == AF_INET || sep->se_family == AF_INET6) && 2229 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2230 time_t t = time(NULL); 2231 int hv = 0xABC3D20F; 2232 int i; 2233 int cnt = 0; 2234 CHash *chBest = NULL; 2235 unsigned int ticks = t / CHTGRAN; 2236 struct sockaddr_in *sin4; 2237 #ifdef INET6 2238 struct sockaddr_in6 *sin6; 2239 #endif 2240 2241 sin4 = (struct sockaddr_in *)&rss; 2242 #ifdef INET6 2243 sin6 = (struct sockaddr_in6 *)&rss; 2244 #endif 2245 { 2246 char *p; 2247 int addrlen; 2248 2249 switch (rss.ss_family) { 2250 case AF_INET: 2251 p = (char *)&sin4->sin_addr; 2252 addrlen = sizeof(struct in_addr); 2253 break; 2254 #ifdef INET6 2255 case AF_INET6: 2256 p = (char *)&sin6->sin6_addr; 2257 addrlen = sizeof(struct in6_addr); 2258 break; 2259 #endif 2260 default: 2261 /* should not happen */ 2262 return -1; 2263 } 2264 2265 for (i = 0; i < addrlen; ++i, ++p) { 2266 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2267 } 2268 hv = (hv ^ (hv >> 16)); 2269 } 2270 for (i = 0; i < 5; ++i) { 2271 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2272 2273 if (rss.ss_family == AF_INET && 2274 ch->ch_Family == AF_INET && 2275 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2276 ch->ch_Service && strcmp(sep->se_service, 2277 ch->ch_Service) == 0) { 2278 chBest = ch; 2279 break; 2280 } 2281 #ifdef INET6 2282 if (rss.ss_family == AF_INET6 && 2283 ch->ch_Family == AF_INET6 && 2284 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2285 &ch->ch_Addr6) != 0 && 2286 ch->ch_Service && strcmp(sep->se_service, 2287 ch->ch_Service) == 0) { 2288 chBest = ch; 2289 break; 2290 } 2291 #endif 2292 if (chBest == NULL || ch->ch_LTime == 0 || 2293 ch->ch_LTime < chBest->ch_LTime) { 2294 chBest = ch; 2295 } 2296 } 2297 if ((rss.ss_family == AF_INET && 2298 (chBest->ch_Family != AF_INET || 2299 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2300 chBest->ch_Service == NULL || 2301 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2302 chBest->ch_Family = sin4->sin_family; 2303 chBest->ch_Addr4 = sin4->sin_addr; 2304 if (chBest->ch_Service) 2305 free(chBest->ch_Service); 2306 chBest->ch_Service = strdup(sep->se_service); 2307 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2308 } 2309 #ifdef INET6 2310 if ((rss.ss_family == AF_INET6 && 2311 (chBest->ch_Family != AF_INET6 || 2312 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2313 &chBest->ch_Addr6) == 0)) || 2314 chBest->ch_Service == NULL || 2315 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2316 chBest->ch_Family = sin6->sin6_family; 2317 chBest->ch_Addr6 = sin6->sin6_addr; 2318 if (chBest->ch_Service) 2319 free(chBest->ch_Service); 2320 chBest->ch_Service = strdup(sep->se_service); 2321 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2322 } 2323 #endif 2324 chBest->ch_LTime = t; 2325 { 2326 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2327 if (ct->ct_Ticks != ticks) { 2328 ct->ct_Ticks = ticks; 2329 ct->ct_Count = 0; 2330 } 2331 ++ct->ct_Count; 2332 } 2333 for (i = 0; i < CHTSIZE; ++i) { 2334 CTime *ct = &chBest->ch_Times[i]; 2335 if (ct->ct_Ticks <= ticks && 2336 ct->ct_Ticks >= ticks - CHTSIZE) { 2337 cnt += ct->ct_Count; 2338 } 2339 } 2340 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2341 char pname[INET6_ADDRSTRLEN]; 2342 2343 getnameinfo((struct sockaddr *)&rss, 2344 ((struct sockaddr *)&rss)->sa_len, 2345 pname, sizeof(pname), NULL, 0, 2346 NI_NUMERICHOST); 2347 r = -1; 2348 syslog(LOG_ERR, 2349 "%s from %s exceeded counts/min (limit %d/min)", 2350 sep->se_service, pname, 2351 sep->se_maxcpm); 2352 } 2353 } 2354 return(r); 2355 } 2356 2357 static struct conninfo * 2358 search_conn(struct servtab *sep, int ctrl) 2359 { 2360 struct sockaddr_storage ss; 2361 socklen_t sslen = sizeof(ss); 2362 struct conninfo *conn; 2363 int hv; 2364 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2365 2366 if (sep->se_maxperip <= 0) 2367 return NULL; 2368 2369 /* 2370 * If getpeername() fails, just let it through (if logging is 2371 * enabled the condition is caught elsewhere) 2372 */ 2373 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2374 return NULL; 2375 2376 switch (ss.ss_family) { 2377 case AF_INET: 2378 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2379 sizeof(struct in_addr)); 2380 break; 2381 #ifdef INET6 2382 case AF_INET6: 2383 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2384 sizeof(struct in6_addr)); 2385 break; 2386 #endif 2387 default: 2388 /* 2389 * Since we only support AF_INET and AF_INET6, just 2390 * let other than AF_INET and AF_INET6 through. 2391 */ 2392 return NULL; 2393 } 2394 2395 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2396 NULL, 0, NI_NUMERICHOST) != 0) 2397 return NULL; 2398 2399 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2400 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2401 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2402 NI_NUMERICHOST) == 0 && 2403 strcmp(pname, pname2) == 0) 2404 break; 2405 } 2406 2407 if (conn == NULL) { 2408 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2409 syslog(LOG_ERR, "malloc: %m"); 2410 exit(EX_OSERR); 2411 } 2412 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2413 if (conn->co_proc == NULL) { 2414 syslog(LOG_ERR, "malloc: %m"); 2415 exit(EX_OSERR); 2416 } 2417 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2418 conn->co_numchild = 0; 2419 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2420 } 2421 2422 /* 2423 * Since a child process is not invoked yet, we cannot 2424 * determine a pid of a child. So, co_proc and co_numchild 2425 * should be filled leter. 2426 */ 2427 2428 return conn; 2429 } 2430 2431 static int 2432 room_conn(struct servtab *sep, struct conninfo *conn) 2433 { 2434 char pname[NI_MAXHOST]; 2435 2436 if (conn->co_numchild >= sep->se_maxperip) { 2437 getnameinfo((struct sockaddr *)&conn->co_addr, 2438 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2439 NI_NUMERICHOST); 2440 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2441 sep->se_service, pname, sep->se_maxperip); 2442 return 0; 2443 } 2444 return 1; 2445 } 2446 2447 static void 2448 addchild_conn(struct conninfo *conn, pid_t pid) 2449 { 2450 struct procinfo *proc; 2451 2452 if (conn == NULL) 2453 return; 2454 2455 if ((proc = search_proc(pid, 1)) != NULL) { 2456 if (proc->pr_conn != NULL) { 2457 syslog(LOG_ERR, 2458 "addchild_conn: child already on process list"); 2459 exit(EX_OSERR); 2460 } 2461 proc->pr_conn = conn; 2462 } 2463 2464 conn->co_proc[conn->co_numchild++] = proc; 2465 } 2466 2467 static void 2468 reapchild_conn(pid_t pid) 2469 { 2470 struct procinfo *proc; 2471 struct conninfo *conn; 2472 int i; 2473 2474 if ((proc = search_proc(pid, 0)) == NULL) 2475 return; 2476 if ((conn = proc->pr_conn) == NULL) 2477 return; 2478 for (i = 0; i < conn->co_numchild; ++i) 2479 if (conn->co_proc[i] == proc) { 2480 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2481 break; 2482 } 2483 free_proc(proc); 2484 free_conn(conn); 2485 } 2486 2487 static void 2488 resize_conn(struct servtab *sep, int maxpip) 2489 { 2490 struct conninfo *conn; 2491 int i, j; 2492 2493 if (sep->se_maxperip <= 0) 2494 return; 2495 if (maxpip <= 0) { 2496 free_connlist(sep); 2497 return; 2498 } 2499 for (i = 0; i < PERIPSIZE; ++i) { 2500 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2501 for (j = maxpip; j < conn->co_numchild; ++j) 2502 free_proc(conn->co_proc[j]); 2503 conn->co_proc = realloc(conn->co_proc, 2504 maxpip * sizeof(*conn->co_proc)); 2505 if (conn->co_proc == NULL) { 2506 syslog(LOG_ERR, "realloc: %m"); 2507 exit(EX_OSERR); 2508 } 2509 if (conn->co_numchild > maxpip) 2510 conn->co_numchild = maxpip; 2511 } 2512 } 2513 } 2514 2515 static void 2516 free_connlist(struct servtab *sep) 2517 { 2518 struct conninfo *conn; 2519 int i, j; 2520 2521 for (i = 0; i < PERIPSIZE; ++i) { 2522 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2523 for (j = 0; j < conn->co_numchild; ++j) 2524 free_proc(conn->co_proc[j]); 2525 conn->co_numchild = 0; 2526 free_conn(conn); 2527 } 2528 } 2529 } 2530 2531 static void 2532 free_conn(struct conninfo *conn) 2533 { 2534 if (conn == NULL) 2535 return; 2536 if (conn->co_numchild <= 0) { 2537 LIST_REMOVE(conn, co_link); 2538 free(conn->co_proc); 2539 free(conn); 2540 } 2541 } 2542 2543 static struct procinfo * 2544 search_proc(pid_t pid, int add) 2545 { 2546 struct procinfo *proc; 2547 int hv; 2548 2549 hv = hashval((char *)&pid, sizeof(pid)); 2550 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2551 if (proc->pr_pid == pid) 2552 break; 2553 } 2554 if (proc == NULL && add) { 2555 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2556 syslog(LOG_ERR, "malloc: %m"); 2557 exit(EX_OSERR); 2558 } 2559 proc->pr_pid = pid; 2560 proc->pr_conn = NULL; 2561 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2562 } 2563 return proc; 2564 } 2565 2566 static void 2567 free_proc(struct procinfo *proc) 2568 { 2569 if (proc == NULL) 2570 return; 2571 LIST_REMOVE(proc, pr_link); 2572 free(proc); 2573 } 2574 2575 static int 2576 hashval(char *p, int len) 2577 { 2578 int i, hv = 0xABC3D20F; 2579 2580 for (i = 0; i < len; ++i, ++p) 2581 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2582 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2583 return hv; 2584 } 2585