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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)from: inetd.c 8.4 (Berkeley) 4/13/94 35 * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $ 36 * $DragonFly: src/usr.sbin/inetd/inetd.c,v 1.8 2005/03/21 19:26:14 liamfoy Exp $ 37 */ 38 39 /* 40 * Inetd - Internet super-server 41 * 42 * This program invokes all internet services as needed. Connection-oriented 43 * services are invoked each time a connection is made, by creating a process. 44 * This process is passed the connection as file descriptor 0 and is expected 45 * to do a getpeername to find out the source host and port. 46 * 47 * Datagram oriented services are invoked when a datagram 48 * arrives; a process is created and passed a pending message 49 * on file descriptor 0. Datagram servers may either connect 50 * to their peer, freeing up the original socket for inetd 51 * to receive further messages on, or ``take over the socket'', 52 * processing all arriving datagrams and, eventually, timing 53 * out. The first type of server is said to be ``multi-threaded''; 54 * the second type of server ``single-threaded''. 55 * 56 * Inetd uses a configuration file which is read at startup 57 * and, possibly, at some later time in response to a hangup signal. 58 * The configuration file is ``free format'' with fields given in the 59 * order shown below. Continuation lines for an entry must begin with 60 * a space or tab. All fields must be present in each entry. 61 * 62 * service name must be in /etc/services 63 * or name a tcpmux service 64 * or specify a unix domain socket 65 * socket type stream/dgram/raw/rdm/seqpacket 66 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix 67 * wait/nowait single-threaded/multi-threaded 68 * user user to run daemon as 69 * server program full path name 70 * server program arguments maximum of MAXARGS (20) 71 * 72 * TCP services without official port numbers are handled with the 73 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 74 * requests. When a connection is made from a foreign host, the service 75 * requested is passed to tcpmux, which looks it up in the servtab list 76 * and returns the proper entry for the service. Tcpmux returns a 77 * negative reply if the service doesn't exist, otherwise the invoked 78 * server is expected to return the positive reply if the service type in 79 * inetd.conf file has the prefix "tcpmux/". If the service type has the 80 * prefix "tcpmux/+", tcpmux will return the positive reply for the 81 * process; this is for compatibility with older server code, and also 82 * allows you to invoke programs that use stdin/stdout without putting any 83 * special server code in them. Services that use tcpmux are "nowait" 84 * because they do not have a well-known port and hence cannot listen 85 * for new requests. 86 * 87 * For RPC services 88 * service name/version must be in /etc/rpc 89 * socket type stream/dgram/raw/rdm/seqpacket 90 * protocol rpc/tcp, rpc/udp 91 * wait/nowait single-threaded/multi-threaded 92 * user user to run daemon as 93 * server program full path name 94 * server program arguments maximum of MAXARGS 95 * 96 * Comment lines are indicated by a `#' in column 1. 97 * 98 * #ifdef IPSEC 99 * Comment lines that start with "#@" denote IPsec policy string, as described 100 * in ipsec_set_policy(3). This will affect all the following items in 101 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 102 * there's no IPsec policy. 103 * #endif 104 */ 105 #include <sys/param.h> 106 #include <sys/ioctl.h> 107 #include <sys/wait.h> 108 #include <sys/time.h> 109 #include <sys/resource.h> 110 #include <sys/stat.h> 111 #include <sys/un.h> 112 113 #include <netinet/in.h> 114 #include <netinet/tcp.h> 115 #include <arpa/inet.h> 116 #include <rpc/rpc.h> 117 #include <rpc/pmap_clnt.h> 118 119 #include <errno.h> 120 #include <err.h> 121 #include <fcntl.h> 122 #include <grp.h> 123 #include <netdb.h> 124 #include <pwd.h> 125 #include <signal.h> 126 #include <stdio.h> 127 #include <stdlib.h> 128 #include <string.h> 129 #include <syslog.h> 130 #include <tcpd.h> 131 #include <unistd.h> 132 #include <libutil.h> 133 #include <sysexits.h> 134 #include <ctype.h> 135 136 #include "inetd.h" 137 #include "pathnames.h" 138 139 #ifdef IPSEC 140 #include <netinet6/ipsec.h> 141 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 142 #undef IPSEC 143 #endif 144 #endif 145 146 /* wrapper for KAME-special getnameinfo() */ 147 #ifndef NI_WITHSCOPEID 148 #define NI_WITHSCOPEID 0 149 #endif 150 151 #ifndef LIBWRAP_ALLOW_FACILITY 152 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 153 #endif 154 #ifndef LIBWRAP_ALLOW_SEVERITY 155 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 156 #endif 157 #ifndef LIBWRAP_DENY_FACILITY 158 # define LIBWRAP_DENY_FACILITY LOG_AUTH 159 #endif 160 #ifndef LIBWRAP_DENY_SEVERITY 161 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 162 #endif 163 164 #define ISWRAP(sep) \ 165 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 166 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 167 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 168 || (sep)->se_socktype == SOCK_DGRAM)) 169 170 #ifdef LOGIN_CAP 171 #include <login_cap.h> 172 173 /* see init.c */ 174 #define RESOURCE_RC "daemon" 175 176 #endif 177 178 #ifndef MAXCHILD 179 #define MAXCHILD -1 /* maximum number of this service 180 < 0 = no limit */ 181 #endif 182 183 #ifndef MAXCPM 184 #define MAXCPM -1 /* rate limit invocations from a 185 single remote address, 186 < 0 = no limit */ 187 #endif 188 189 #ifndef MAXPERIP 190 #define MAXPERIP -1 /* maximum number of this service 191 from a single remote address, 192 < 0 = no limit */ 193 #endif 194 195 #ifndef TOOMANY 196 #define TOOMANY 256 /* don't start more than TOOMANY */ 197 #endif 198 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 199 #define RETRYTIME (60*10) /* retry after bind or server fail */ 200 #define MAX_MAXCHLD 32767 /* max allowable max children */ 201 202 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 203 204 void close_sep(struct servtab *); 205 void flag_signal(int); 206 void flag_config(int); 207 void config(void); 208 int cpmip(const struct servtab *, int); 209 void endconfig(void); 210 struct servtab *enter(struct servtab *); 211 void freeconfig(struct servtab *); 212 struct servtab *getconfigent(void); 213 int matchservent(const char *, const char *, const char *); 214 char *nextline(FILE *); 215 void addchild(struct servtab *, int); 216 void flag_reapchild(int); 217 void reapchild(void); 218 void enable(struct servtab *); 219 void disable(struct servtab *); 220 void flag_retry(int); 221 void retry(void); 222 int setconfig(void); 223 void setup(struct servtab *); 224 #ifdef IPSEC 225 void ipsecsetup(struct servtab *); 226 #endif 227 void unregisterrpc(struct servtab *sep); 228 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 229 static int room_conn(struct servtab *sep, struct conninfo *conn); 230 static void addchild_conn(struct conninfo *conn, pid_t pid); 231 static void reapchild_conn(pid_t pid); 232 static void free_conn(struct conninfo *conn); 233 static void resize_conn(struct servtab *sep, int maxperip); 234 static void free_connlist(struct servtab *sep); 235 static void free_proc(struct procinfo *); 236 static struct procinfo *search_proc(pid_t pid, int add); 237 static int hashval(char *p, int len); 238 239 int allow_severity; 240 int deny_severity; 241 int wrap_ex = 0; 242 int wrap_bi = 0; 243 int debug = 0; 244 int log = 0; 245 int maxsock; /* highest-numbered descriptor */ 246 fd_set allsock; 247 int options; 248 int timingout; 249 int toomany = TOOMANY; 250 int maxchild = MAXCHILD; 251 int maxcpm = MAXCPM; 252 int maxperip = MAXPERIP; 253 struct servent *sp; 254 struct rpcent *rpc; 255 char *hostname = NULL; 256 struct sockaddr_in *bind_sa4; 257 int no_v4bind = 1; 258 #ifdef INET6 259 struct sockaddr_in6 *bind_sa6; 260 int no_v6bind = 1; 261 #endif 262 int signalpipe[2]; 263 #ifdef SANITY_CHECK 264 int nsock; 265 #endif 266 uid_t euid; 267 gid_t egid; 268 mode_t mask; 269 270 struct servtab *servtab; 271 272 extern struct biltin biltins[]; 273 274 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 275 const char *CONFIG = _PATH_INETDCONF; 276 const char *pid_file = _PATH_INETDPID; 277 278 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 279 280 int 281 getvalue(const char *arg, int *value, const char *whine) 282 { 283 int tmp; 284 char *p; 285 286 tmp = strtol(arg, &p, 0); 287 if (tmp < 0 || *p) { 288 syslog(LOG_ERR, whine, arg); 289 return 1; /* failure */ 290 } 291 *value = tmp; 292 return 0; /* success */ 293 } 294 295 static sa_family_t 296 whichaf(struct request_info *req) 297 { 298 struct sockaddr *sa; 299 300 sa = (struct sockaddr *)req->client->sin; 301 if (sa == NULL) 302 return AF_UNSPEC; 303 if (sa->sa_family == AF_INET6 && 304 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr)) 305 return AF_INET; 306 return sa->sa_family; 307 } 308 309 int 310 main(int argc, char **argv) 311 { 312 struct servtab *sep; 313 struct passwd *pwd; 314 struct group *grp; 315 struct sigaction sa, saalrm, sachld, sahup, sapipe; 316 int ch, dofork; 317 pid_t pid; 318 char buf[50]; 319 #ifdef LOGIN_CAP 320 login_cap_t *lc = NULL; 321 #endif 322 struct request_info req; 323 int denied; 324 char *service = NULL; 325 union { 326 struct sockaddr peer_un; 327 struct sockaddr_in peer_un4; 328 struct sockaddr_in6 peer_un6; 329 struct sockaddr_storage peer_max; 330 } p_un; 331 #define peer p_un.peer_un 332 #define peer4 p_un.peer_un4 333 #define peer6 p_un.peer_un6 334 #define peermax p_un.peer_max 335 int i; 336 struct addrinfo hints, *res; 337 const char *servname; 338 int error; 339 struct conninfo *conn; 340 341 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 342 343 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 344 switch(ch) { 345 case 'd': 346 debug = 1; 347 options |= SO_DEBUG; 348 break; 349 case 'l': 350 log = 1; 351 break; 352 case 'R': 353 getvalue(optarg, &toomany, 354 "-R %s: bad value for service invocation rate"); 355 break; 356 case 'c': 357 getvalue(optarg, &maxchild, 358 "-c %s: bad value for maximum children"); 359 break; 360 case 'C': 361 getvalue(optarg, &maxcpm, 362 "-C %s: bad value for maximum children/minute"); 363 break; 364 case 'a': 365 hostname = optarg; 366 break; 367 case 'p': 368 pid_file = optarg; 369 break; 370 case 's': 371 getvalue(optarg, &maxperip, 372 "-s %s: bad value for maximum children per source address"); 373 break; 374 case 'w': 375 wrap_ex++; 376 break; 377 case 'W': 378 wrap_bi++; 379 break; 380 case '?': 381 default: 382 syslog(LOG_ERR, 383 "usage: inetd [-dlwW] [-a address] [-R rate]" 384 " [-c maximum] [-C rate]" 385 " [-p pidfile] [conf-file]"); 386 exit(EX_USAGE); 387 } 388 /* 389 * Initialize Bind Addrs. 390 * When hostname is NULL, wild card bind addrs are obtained from 391 * getaddrinfo(). But getaddrinfo() requires at least one of 392 * hostname or servname is non NULL. 393 * So when hostname is NULL, set dummy value to servname. 394 */ 395 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL; 396 397 bzero(&hints, sizeof(struct addrinfo)); 398 hints.ai_flags = AI_PASSIVE; 399 hints.ai_family = AF_UNSPEC; 400 error = getaddrinfo(hostname, servname, &hints, &res); 401 if (error != 0) { 402 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 403 if (error == EAI_SYSTEM) 404 syslog(LOG_ERR, "%s", strerror(errno)); 405 exit(EX_USAGE); 406 } 407 do { 408 if (res->ai_addr == NULL) { 409 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 410 exit(EX_USAGE); 411 } 412 switch (res->ai_addr->sa_family) { 413 case AF_INET: 414 if (no_v4bind == 0) 415 continue; 416 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 417 /* init port num in case servname is dummy */ 418 bind_sa4->sin_port = 0; 419 no_v4bind = 0; 420 continue; 421 #ifdef INET6 422 case AF_INET6: 423 if (no_v6bind == 0) 424 continue; 425 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 426 /* init port num in case servname is dummy */ 427 bind_sa6->sin6_port = 0; 428 no_v6bind = 0; 429 continue; 430 #endif 431 } 432 if (no_v4bind == 0 433 #ifdef INET6 434 && no_v6bind == 0 435 #endif 436 ) 437 break; 438 } while ((res = res->ai_next) != NULL); 439 if (no_v4bind != 0 440 #ifdef INET6 441 && no_v6bind != 0 442 #endif 443 ) { 444 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 445 exit(EX_USAGE); 446 } 447 448 euid = geteuid(); 449 egid = getegid(); 450 umask(mask = umask(0777)); 451 452 argc -= optind; 453 argv += optind; 454 455 if (argc > 0) 456 CONFIG = argv[0]; 457 if (debug == 0) { 458 FILE *fp; 459 if (daemon(0, 0) < 0) { 460 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 461 } 462 /* From now on we don't want syslog messages going to stderr. */ 463 closelog(); 464 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 465 /* 466 * In case somebody has started inetd manually, we need to 467 * clear the logname, so that old servers run as root do not 468 * get the user's logname.. 469 */ 470 if (setlogin("") < 0) { 471 syslog(LOG_WARNING, "cannot clear logname: %m"); 472 /* no big deal if it fails.. */ 473 } 474 pid = getpid(); 475 fp = fopen(pid_file, "w"); 476 if (fp) { 477 fprintf(fp, "%ld\n", (long)pid); 478 fclose(fp); 479 } else { 480 syslog(LOG_WARNING, "%s: %m", pid_file); 481 } 482 } 483 for (i = 0; i < PERIPSIZE; ++i) 484 LIST_INIT(&proctable[i]); 485 sa.sa_flags = 0; 486 sigemptyset(&sa.sa_mask); 487 sigaddset(&sa.sa_mask, SIGALRM); 488 sigaddset(&sa.sa_mask, SIGCHLD); 489 sigaddset(&sa.sa_mask, SIGHUP); 490 sa.sa_handler = flag_retry; 491 sigaction(SIGALRM, &sa, &saalrm); 492 config(); 493 sa.sa_handler = flag_config; 494 sigaction(SIGHUP, &sa, &sahup); 495 sa.sa_handler = flag_reapchild; 496 sigaction(SIGCHLD, &sa, &sachld); 497 sa.sa_handler = SIG_IGN; 498 sigaction(SIGPIPE, &sa, &sapipe); 499 500 { 501 /* space for daemons to overwrite environment for ps */ 502 #define DUMMYSIZE 100 503 char dummy[DUMMYSIZE]; 504 505 memset(dummy, 'x', DUMMYSIZE - 1); 506 dummy[DUMMYSIZE - 1] = '\0'; 507 setenv("inetd_dummy", dummy, 1); 508 } 509 510 if (pipe(signalpipe) != 0) { 511 syslog(LOG_ERR, "pipe: %m"); 512 exit(EX_OSERR); 513 } 514 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 || 515 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) { 516 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m"); 517 exit(EX_OSERR); 518 } 519 FD_SET(signalpipe[0], &allsock); 520 #ifdef SANITY_CHECK 521 nsock++; 522 #endif 523 if (signalpipe[0] > maxsock) 524 maxsock = signalpipe[0]; 525 if (signalpipe[1] > maxsock) 526 maxsock = signalpipe[1]; 527 528 for (;;) { 529 int n, ctrl; 530 fd_set readable; 531 532 #ifdef SANITY_CHECK 533 if (nsock == 0) { 534 syslog(LOG_ERR, "%s: nsock=0", __func__); 535 exit(EX_SOFTWARE); 536 } 537 #endif 538 readable = allsock; 539 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 540 (fd_set *)0, (struct timeval *)0)) <= 0) { 541 if (n < 0 && errno != EINTR) { 542 syslog(LOG_WARNING, "select: %m"); 543 sleep(1); 544 } 545 continue; 546 } 547 /* handle any queued signal flags */ 548 if (FD_ISSET(signalpipe[0], &readable)) { 549 int nsig; 550 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 551 syslog(LOG_ERR, "ioctl: %m"); 552 exit(EX_OSERR); 553 } 554 while (--nsig >= 0) { 555 char c; 556 if (read(signalpipe[0], &c, 1) != 1) { 557 syslog(LOG_ERR, "read: %m"); 558 exit(EX_OSERR); 559 } 560 if (debug) 561 warnx("handling signal flag %c", c); 562 switch(c) { 563 case 'A': /* sigalrm */ 564 retry(); 565 break; 566 case 'C': /* sigchld */ 567 reapchild(); 568 break; 569 case 'H': /* sighup */ 570 config(); 571 break; 572 } 573 } 574 } 575 for (sep = servtab; n && sep; sep = sep->se_next) 576 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 577 n--; 578 if (debug) 579 warnx("someone wants %s", sep->se_service); 580 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 581 conn = NULL; 582 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 583 i = 1; 584 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 585 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 586 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 587 (socklen_t *)0); 588 if (debug) 589 warnx("accept, ctrl %d", ctrl); 590 if (ctrl < 0) { 591 if (errno != EINTR) 592 syslog(LOG_WARNING, 593 "accept (for %s): %m", 594 sep->se_service); 595 if (sep->se_accept && 596 sep->se_socktype == SOCK_STREAM) 597 close(ctrl); 598 continue; 599 } 600 i = 0; 601 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 602 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 603 if (ioctl(ctrl, FIONBIO, &i) < 0) 604 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 605 if (cpmip(sep, ctrl) < 0) { 606 close(ctrl); 607 continue; 608 } 609 if (dofork && 610 (conn = search_conn(sep, ctrl)) != NULL && 611 !room_conn(sep, conn)) { 612 close(ctrl); 613 continue; 614 } 615 } else 616 ctrl = sep->se_fd; 617 if (log && !ISWRAP(sep)) { 618 char pname[INET6_ADDRSTRLEN] = "unknown"; 619 socklen_t sl; 620 sl = sizeof peermax; 621 if (getpeername(ctrl, (struct sockaddr *) 622 &peermax, &sl)) { 623 sl = sizeof peermax; 624 if (recvfrom(ctrl, buf, sizeof(buf), 625 MSG_PEEK, 626 (struct sockaddr *)&peermax, 627 &sl) >= 0) { 628 getnameinfo((struct sockaddr *)&peermax, 629 peer.sa_len, 630 pname, sizeof(pname), 631 NULL, 0, 632 NI_NUMERICHOST| 633 NI_WITHSCOPEID); 634 } 635 } else { 636 getnameinfo((struct sockaddr *)&peermax, 637 peer.sa_len, 638 pname, sizeof(pname), 639 NULL, 0, 640 NI_NUMERICHOST| 641 NI_WITHSCOPEID); 642 } 643 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 644 } 645 sigblock(SIGBLOCK); 646 pid = 0; 647 /* 648 * Fork for all external services, builtins which need to 649 * fork and anything we're wrapping (as wrapping might 650 * block or use hosts_options(5) twist). 651 */ 652 if (dofork) { 653 if (sep->se_count++ == 0) 654 gettimeofday(&sep->se_time, (struct timezone *)NULL); 655 else if (toomany > 0 && sep->se_count >= toomany) { 656 struct timeval now; 657 658 gettimeofday(&now, (struct timezone *)NULL); 659 if (now.tv_sec - sep->se_time.tv_sec > 660 CNT_INTVL) { 661 sep->se_time = now; 662 sep->se_count = 1; 663 } else { 664 syslog(LOG_ERR, 665 "%s/%s server failing (looping), service terminated", 666 sep->se_service, sep->se_proto); 667 if (sep->se_accept && 668 sep->se_socktype == SOCK_STREAM) 669 close(ctrl); 670 close_sep(sep); 671 free_conn(conn); 672 sigsetmask(0L); 673 if (!timingout) { 674 timingout = 1; 675 alarm(RETRYTIME); 676 } 677 continue; 678 } 679 } 680 pid = fork(); 681 } 682 if (pid < 0) { 683 syslog(LOG_ERR, "fork: %m"); 684 if (sep->se_accept && 685 sep->se_socktype == SOCK_STREAM) 686 close(ctrl); 687 free_conn(conn); 688 sigsetmask(0L); 689 sleep(1); 690 continue; 691 } 692 if (pid) { 693 addchild_conn(conn, pid); 694 addchild(sep, pid); 695 } 696 sigsetmask(0L); 697 if (pid == 0) { 698 if (dofork) { 699 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 700 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 701 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 702 /* SIGPIPE reset before exec */ 703 } 704 /* 705 * Call tcpmux to find the real service to exec. 706 */ 707 if (sep->se_bi && 708 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 709 sep = tcpmux(ctrl); 710 if (sep == NULL) { 711 close(ctrl); 712 _exit(0); 713 } 714 } 715 if (ISWRAP(sep)) { 716 inetd_setproctitle("wrapping", ctrl); 717 service = sep->se_server_name ? 718 sep->se_server_name : sep->se_service; 719 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL); 720 fromhost(&req); 721 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 722 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 723 denied = !hosts_access(&req); 724 if (denied) { 725 syslog(deny_severity, 726 "refused connection from %.500s, service %s (%s%s)", 727 eval_client(&req), service, sep->se_proto, 728 (whichaf(&req) == AF_INET6) ? "6" : ""); 729 if (sep->se_socktype != SOCK_STREAM) 730 recv(ctrl, buf, sizeof (buf), 0); 731 if (dofork) { 732 sleep(1); 733 _exit(0); 734 } 735 } 736 if (log) { 737 syslog(allow_severity, 738 "connection from %.500s, service %s (%s%s)", 739 eval_client(&req), service, sep->se_proto, 740 (whichaf(&req) == AF_INET6) ? "6" : ""); 741 } 742 } 743 if (sep->se_bi) { 744 (*sep->se_bi->bi_fn)(ctrl, sep); 745 } else { 746 if (debug) 747 warnx("%d execl %s", 748 getpid(), sep->se_server); 749 /* Clear close-on-exec. */ 750 if (fcntl(ctrl, F_SETFD, 0) < 0) { 751 syslog(LOG_ERR, 752 "%s/%s: fcntl (F_SETFD, 0): %m", 753 sep->se_service, sep->se_proto); 754 _exit(EX_OSERR); 755 } 756 if (ctrl != 0) { 757 dup2(ctrl, 0); 758 close(ctrl); 759 } 760 dup2(0, 1); 761 dup2(0, 2); 762 if ((pwd = getpwnam(sep->se_user)) == NULL) { 763 syslog(LOG_ERR, 764 "%s/%s: %s: no such user", 765 sep->se_service, sep->se_proto, 766 sep->se_user); 767 if (sep->se_socktype != SOCK_STREAM) 768 recv(0, buf, sizeof (buf), 0); 769 _exit(EX_NOUSER); 770 } 771 grp = NULL; 772 if ( sep->se_group != NULL 773 && (grp = getgrnam(sep->se_group)) == NULL 774 ) { 775 syslog(LOG_ERR, 776 "%s/%s: %s: no such group", 777 sep->se_service, sep->se_proto, 778 sep->se_group); 779 if (sep->se_socktype != SOCK_STREAM) 780 recv(0, buf, sizeof (buf), 0); 781 _exit(EX_NOUSER); 782 } 783 if (grp != NULL) 784 pwd->pw_gid = grp->gr_gid; 785 #ifdef LOGIN_CAP 786 if ((lc = login_getclass(sep->se_class)) == NULL) { 787 /* error syslogged by getclass */ 788 syslog(LOG_ERR, 789 "%s/%s: %s: login class error", 790 sep->se_service, sep->se_proto, 791 sep->se_class); 792 if (sep->se_socktype != SOCK_STREAM) 793 recv(0, buf, sizeof (buf), 0); 794 _exit(EX_NOUSER); 795 } 796 #endif 797 if (setsid() < 0) { 798 syslog(LOG_ERR, 799 "%s: can't setsid(): %m", 800 sep->se_service); 801 /* _exit(EX_OSERR); not fatal yet */ 802 } 803 #ifdef LOGIN_CAP 804 if (setusercontext(lc, pwd, pwd->pw_uid, 805 LOGIN_SETALL) != 0) { 806 syslog(LOG_ERR, 807 "%s: can't setusercontext(..%s..): %m", 808 sep->se_service, sep->se_user); 809 _exit(EX_OSERR); 810 } 811 login_close(lc); 812 #else 813 if (pwd->pw_uid) { 814 if (setlogin(sep->se_user) < 0) { 815 syslog(LOG_ERR, 816 "%s: can't setlogin(%s): %m", 817 sep->se_service, sep->se_user); 818 /* _exit(EX_OSERR); not yet */ 819 } 820 if (setgid(pwd->pw_gid) < 0) { 821 syslog(LOG_ERR, 822 "%s: can't set gid %d: %m", 823 sep->se_service, pwd->pw_gid); 824 _exit(EX_OSERR); 825 } 826 initgroups(pwd->pw_name, 827 pwd->pw_gid); 828 if (setuid(pwd->pw_uid) < 0) { 829 syslog(LOG_ERR, 830 "%s: can't set uid %d: %m", 831 sep->se_service, pwd->pw_uid); 832 _exit(EX_OSERR); 833 } 834 } 835 #endif 836 sigaction(SIGPIPE, &sapipe, 837 (struct sigaction *)0); 838 execv(sep->se_server, sep->se_argv); 839 syslog(LOG_ERR, 840 "cannot execute %s: %m", sep->se_server); 841 if (sep->se_socktype != SOCK_STREAM) 842 recv(0, buf, sizeof (buf), 0); 843 } 844 if (dofork) 845 _exit(0); 846 } 847 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 848 close(ctrl); 849 } 850 } 851 } 852 853 /* 854 * Add a signal flag to the signal flag queue for later handling 855 */ 856 857 void 858 flag_signal(int c) 859 { 860 char ch = c; 861 862 if (write(signalpipe[1], &ch, 1) != 1) { 863 syslog(LOG_ERR, "write: %m"); 864 _exit(EX_OSERR); 865 } 866 } 867 868 /* 869 * Record a new child pid for this service. If we've reached the 870 * limit on children, then stop accepting incoming requests. 871 */ 872 873 void 874 addchild(struct servtab *sep, pid_t pid) 875 { 876 if (sep->se_maxchild <= 0) 877 return; 878 #ifdef SANITY_CHECK 879 if (sep->se_numchild >= sep->se_maxchild) { 880 syslog(LOG_ERR, "%s: %d >= %d", 881 __func__, sep->se_numchild, sep->se_maxchild); 882 exit(EX_SOFTWARE); 883 } 884 #endif 885 sep->se_pids[sep->se_numchild++] = pid; 886 if (sep->se_numchild == sep->se_maxchild) 887 disable(sep); 888 } 889 890 /* 891 * Some child process has exited. See if it's on somebody's list. 892 */ 893 894 void 895 flag_reapchild(int signo __unused) 896 { 897 flag_signal('C'); 898 } 899 900 void 901 reapchild(void) 902 { 903 int k, status; 904 pid_t pid; 905 struct servtab *sep; 906 907 for (;;) { 908 pid = wait3(&status, WNOHANG, (struct rusage *)0); 909 if (pid <= 0) 910 break; 911 if (debug) 912 warnx("%d reaped, %s %u", pid, 913 WIFEXITED(status) ? "status" : "signal", 914 WIFEXITED(status) ? WEXITSTATUS(status) 915 : WTERMSIG(status)); 916 for (sep = servtab; sep; sep = sep->se_next) { 917 for (k = 0; k < sep->se_numchild; k++) 918 if (sep->se_pids[k] == pid) 919 break; 920 if (k == sep->se_numchild) 921 continue; 922 if (sep->se_numchild == sep->se_maxchild) 923 enable(sep); 924 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 925 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 926 syslog(LOG_WARNING, 927 "%s[%d]: exited, %s %u", 928 sep->se_server, pid, 929 WIFEXITED(status) ? "status" : "signal", 930 WIFEXITED(status) ? WEXITSTATUS(status) 931 : WTERMSIG(status)); 932 break; 933 } 934 reapchild_conn(pid); 935 } 936 } 937 938 void 939 flag_config(int signo __unused) 940 { 941 flag_signal('H'); 942 } 943 944 void 945 config(void) 946 { 947 struct servtab *sep, *new, **sepp; 948 long omask; 949 #ifdef LOGIN_CAP 950 login_cap_t *lc = NULL; 951 #endif 952 953 954 if (!setconfig()) { 955 syslog(LOG_ERR, "%s: %m", CONFIG); 956 return; 957 } 958 for (sep = servtab; sep; sep = sep->se_next) 959 sep->se_checked = 0; 960 while ((new = getconfigent())) { 961 if (getpwnam(new->se_user) == NULL) { 962 syslog(LOG_ERR, 963 "%s/%s: no such user '%s', service ignored", 964 new->se_service, new->se_proto, new->se_user); 965 continue; 966 } 967 if (new->se_group && getgrnam(new->se_group) == NULL) { 968 syslog(LOG_ERR, 969 "%s/%s: no such group '%s', service ignored", 970 new->se_service, new->se_proto, new->se_group); 971 continue; 972 } 973 #ifdef LOGIN_CAP 974 if ((lc = login_getclass(new->se_class)) == NULL) { 975 /* error syslogged by getclass */ 976 syslog(LOG_ERR, 977 "%s/%s: %s: login class error, service ignored", 978 new->se_service, new->se_proto, new->se_class); 979 continue; 980 } 981 login_close(lc); 982 #endif 983 for (sep = servtab; sep; sep = sep->se_next) 984 if (strcmp(sep->se_service, new->se_service) == 0 && 985 strcmp(sep->se_proto, new->se_proto) == 0 && 986 sep->se_socktype == new->se_socktype && 987 sep->se_family == new->se_family) 988 break; 989 if (sep != 0) { 990 int i; 991 992 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; } 993 omask = sigblock(SIGBLOCK); 994 if (sep->se_nomapped != new->se_nomapped) { 995 sep->se_nomapped = new->se_nomapped; 996 sep->se_reset = 1; 997 } 998 /* copy over outstanding child pids */ 999 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1000 new->se_numchild = sep->se_numchild; 1001 if (new->se_numchild > new->se_maxchild) 1002 new->se_numchild = new->se_maxchild; 1003 memcpy(new->se_pids, sep->se_pids, 1004 new->se_numchild * sizeof(*new->se_pids)); 1005 } 1006 SWAP(sep->se_pids, new->se_pids); 1007 sep->se_maxchild = new->se_maxchild; 1008 sep->se_numchild = new->se_numchild; 1009 sep->se_maxcpm = new->se_maxcpm; 1010 resize_conn(sep, new->se_maxperip); 1011 sep->se_maxperip = new->se_maxperip; 1012 sep->se_bi = new->se_bi; 1013 /* might need to turn on or off service now */ 1014 if (sep->se_fd >= 0) { 1015 if (sep->se_maxchild > 0 1016 && sep->se_numchild == sep->se_maxchild) { 1017 if (FD_ISSET(sep->se_fd, &allsock)) 1018 disable(sep); 1019 } else { 1020 if (!FD_ISSET(sep->se_fd, &allsock)) 1021 enable(sep); 1022 } 1023 } 1024 sep->se_accept = new->se_accept; 1025 SWAP(sep->se_user, new->se_user); 1026 SWAP(sep->se_group, new->se_group); 1027 #ifdef LOGIN_CAP 1028 SWAP(sep->se_class, new->se_class); 1029 #endif 1030 SWAP(sep->se_server, new->se_server); 1031 SWAP(sep->se_server_name, new->se_server_name); 1032 for (i = 0; i < MAXARGV; i++) 1033 SWAP(sep->se_argv[i], new->se_argv[i]); 1034 #ifdef IPSEC 1035 SWAP(sep->se_policy, new->se_policy); 1036 ipsecsetup(sep); 1037 #endif 1038 sigsetmask(omask); 1039 freeconfig(new); 1040 if (debug) 1041 print_service("REDO", sep); 1042 } else { 1043 sep = enter(new); 1044 if (debug) 1045 print_service("ADD ", sep); 1046 } 1047 sep->se_checked = 1; 1048 if (ISMUX(sep)) { 1049 sep->se_fd = -1; 1050 continue; 1051 } 1052 switch (sep->se_family) { 1053 case AF_INET: 1054 if (no_v4bind != 0) { 1055 sep->se_fd = -1; 1056 continue; 1057 } 1058 break; 1059 #ifdef INET6 1060 case AF_INET6: 1061 if (no_v6bind != 0) { 1062 sep->se_fd = -1; 1063 continue; 1064 } 1065 break; 1066 #endif 1067 } 1068 if (!sep->se_rpc) { 1069 if (sep->se_family != AF_UNIX) { 1070 sp = getservbyname(sep->se_service, sep->se_proto); 1071 if (sp == 0) { 1072 syslog(LOG_ERR, "%s/%s: unknown service", 1073 sep->se_service, sep->se_proto); 1074 sep->se_checked = 0; 1075 continue; 1076 } 1077 } 1078 switch (sep->se_family) { 1079 case AF_INET: 1080 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1081 sep->se_ctrladdr4.sin_port = 1082 sp->s_port; 1083 sep->se_reset = 1; 1084 } 1085 break; 1086 #ifdef INET6 1087 case AF_INET6: 1088 if (sp->s_port != 1089 sep->se_ctrladdr6.sin6_port) { 1090 sep->se_ctrladdr6.sin6_port = 1091 sp->s_port; 1092 sep->se_reset = 1; 1093 } 1094 break; 1095 #endif 1096 } 1097 if (sep->se_reset != 0 && sep->se_fd >= 0) 1098 close_sep(sep); 1099 } else { 1100 rpc = getrpcbyname(sep->se_service); 1101 if (rpc == 0) { 1102 syslog(LOG_ERR, "%s/%s unknown RPC service", 1103 sep->se_service, sep->se_proto); 1104 if (sep->se_fd != -1) 1105 close(sep->se_fd); 1106 sep->se_fd = -1; 1107 continue; 1108 } 1109 if (rpc->r_number != sep->se_rpc_prog) { 1110 if (sep->se_rpc_prog) 1111 unregisterrpc(sep); 1112 sep->se_rpc_prog = rpc->r_number; 1113 if (sep->se_fd != -1) 1114 close(sep->se_fd); 1115 sep->se_fd = -1; 1116 } 1117 } 1118 if (sep->se_fd == -1) 1119 setup(sep); 1120 } 1121 endconfig(); 1122 /* 1123 * Purge anything not looked at above. 1124 */ 1125 omask = sigblock(SIGBLOCK); 1126 sepp = &servtab; 1127 while ((sep = *sepp)) { 1128 if (sep->se_checked) { 1129 sepp = &sep->se_next; 1130 continue; 1131 } 1132 *sepp = sep->se_next; 1133 if (sep->se_fd >= 0) 1134 close_sep(sep); 1135 if (debug) 1136 print_service("FREE", sep); 1137 if (sep->se_rpc && sep->se_rpc_prog > 0) 1138 unregisterrpc(sep); 1139 freeconfig(sep); 1140 free(sep); 1141 } 1142 sigsetmask(omask); 1143 } 1144 1145 void 1146 unregisterrpc(struct servtab *sep) 1147 { 1148 u_int i; 1149 struct servtab *sepp; 1150 long omask; 1151 1152 omask = sigblock(SIGBLOCK); 1153 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1154 if (sepp == sep) 1155 continue; 1156 if (sep->se_checked == 0 || 1157 !sepp->se_rpc || 1158 sep->se_rpc_prog != sepp->se_rpc_prog) 1159 continue; 1160 return; 1161 } 1162 if (debug) 1163 print_service("UNREG", sep); 1164 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) 1165 pmap_unset(sep->se_rpc_prog, i); 1166 if (sep->se_fd != -1) 1167 close(sep->se_fd); 1168 sep->se_fd = -1; 1169 sigsetmask(omask); 1170 } 1171 1172 void 1173 flag_retry(int signo __unused) 1174 { 1175 flag_signal('A'); 1176 } 1177 1178 void 1179 retry(void) 1180 { 1181 struct servtab *sep; 1182 1183 timingout = 0; 1184 for (sep = servtab; sep; sep = sep->se_next) 1185 if (sep->se_fd == -1 && !ISMUX(sep)) 1186 setup(sep); 1187 } 1188 1189 void 1190 setup(struct servtab *sep) 1191 { 1192 int on = 1; 1193 1194 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1195 if (debug) 1196 warn("socket failed on %s/%s", 1197 sep->se_service, sep->se_proto); 1198 syslog(LOG_ERR, "%s/%s: socket: %m", 1199 sep->se_service, sep->se_proto); 1200 return; 1201 } 1202 /* Set all listening sockets to close-on-exec. */ 1203 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1204 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m", 1205 sep->se_service, sep->se_proto); 1206 close(sep->se_fd); 1207 return; 1208 } 1209 #define turnon(fd, opt) \ 1210 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1211 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1212 turnon(sep->se_fd, SO_DEBUG) < 0) 1213 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1214 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1215 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1216 #ifdef SO_PRIVSTATE 1217 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1218 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1219 #endif 1220 /* tftpd opens a new connection then needs more infos */ 1221 if ((sep->se_family == AF_INET6) && 1222 (strcmp(sep->se_proto, "udp") == 0) && 1223 (sep->se_accept == 0) && 1224 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO, 1225 (char *)&on, sizeof (on)) < 0)) 1226 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1227 if (sep->se_family == AF_INET6) { 1228 int flag = sep->se_nomapped ? 1 : 0; 1229 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1230 (char *)&flag, sizeof (flag)) < 0) 1231 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1232 } 1233 #undef turnon 1234 if (sep->se_type == TTCP_TYPE) 1235 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, 1236 (char *)&on, sizeof (on)) < 0) 1237 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); 1238 #ifdef IPV6_FAITH 1239 if (sep->se_type == FAITH_TYPE) { 1240 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1241 sizeof(on)) < 0) { 1242 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1243 } 1244 } 1245 #endif 1246 #ifdef IPSEC 1247 ipsecsetup(sep); 1248 #endif 1249 if (sep->se_family == AF_UNIX) { 1250 unlink(sep->se_ctrladdr_un.sun_path); 1251 umask(0777); /* Make socket with conservative permissions */ 1252 } 1253 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1254 sep->se_ctrladdr_size) < 0) { 1255 if (debug) 1256 warn("bind failed on %s/%s", 1257 sep->se_service, sep->se_proto); 1258 syslog(LOG_ERR, "%s/%s: bind: %m", 1259 sep->se_service, sep->se_proto); 1260 close(sep->se_fd); 1261 sep->se_fd = -1; 1262 if (!timingout) { 1263 timingout = 1; 1264 alarm(RETRYTIME); 1265 } 1266 if (sep->se_family == AF_UNIX) 1267 umask(mask); 1268 return; 1269 } 1270 if (sep->se_family == AF_UNIX) { 1271 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1272 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1273 syslog(LOG_ERR, "chown socket: %m"); 1274 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1275 syslog(LOG_ERR, "chmod socket: %m"); 1276 umask(mask); 1277 } 1278 if (sep->se_rpc) { 1279 u_int i; 1280 socklen_t len = sep->se_ctrladdr_size; 1281 1282 if (sep->se_family != AF_INET) { 1283 syslog(LOG_ERR, 1284 "%s/%s: unsupported address family for rpc", 1285 sep->se_service, sep->se_proto); 1286 close(sep->se_fd); 1287 sep->se_fd = -1; 1288 return; 1289 } 1290 if (getsockname(sep->se_fd, 1291 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1292 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1293 sep->se_service, sep->se_proto); 1294 close(sep->se_fd); 1295 sep->se_fd = -1; 1296 return; 1297 } 1298 if (debug) 1299 print_service("REG ", sep); 1300 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1301 pmap_unset(sep->se_rpc_prog, i); 1302 pmap_set(sep->se_rpc_prog, i, 1303 (sep->se_socktype == SOCK_DGRAM) 1304 ? IPPROTO_UDP : IPPROTO_TCP, 1305 ntohs(sep->se_ctrladdr4.sin_port)); 1306 } 1307 } 1308 if (sep->se_socktype == SOCK_STREAM) 1309 listen(sep->se_fd, 64); 1310 enable(sep); 1311 if (debug) { 1312 warnx("registered %s on %d", 1313 sep->se_server, sep->se_fd); 1314 } 1315 } 1316 1317 #ifdef IPSEC 1318 void 1319 ipsecsetup(struct servtab *sep) 1320 { 1321 char *buf; 1322 char *policy_in = NULL; 1323 char *policy_out = NULL; 1324 int level; 1325 int opt; 1326 1327 switch (sep->se_family) { 1328 case AF_INET: 1329 level = IPPROTO_IP; 1330 opt = IP_IPSEC_POLICY; 1331 break; 1332 #ifdef INET6 1333 case AF_INET6: 1334 level = IPPROTO_IPV6; 1335 opt = IPV6_IPSEC_POLICY; 1336 break; 1337 #endif 1338 default: 1339 return; 1340 } 1341 1342 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1343 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1344 policy_in = def_in; 1345 policy_out = def_out; 1346 } else { 1347 if (!strncmp("in", sep->se_policy, 2)) 1348 policy_in = sep->se_policy; 1349 else if (!strncmp("out", sep->se_policy, 3)) 1350 policy_out = sep->se_policy; 1351 else { 1352 syslog(LOG_ERR, "invalid security policy \"%s\"", 1353 sep->se_policy); 1354 return; 1355 } 1356 } 1357 1358 if (policy_in != NULL) { 1359 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1360 if (buf != NULL) { 1361 if (setsockopt(sep->se_fd, level, opt, 1362 buf, ipsec_get_policylen(buf)) < 0 && 1363 debug != 0) 1364 warnx("%s/%s: ipsec initialization failed; %s", 1365 sep->se_service, sep->se_proto, 1366 policy_in); 1367 free(buf); 1368 } else 1369 syslog(LOG_ERR, "invalid security policy \"%s\"", 1370 policy_in); 1371 } 1372 if (policy_out != NULL) { 1373 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1374 if (buf != NULL) { 1375 if (setsockopt(sep->se_fd, level, opt, 1376 buf, ipsec_get_policylen(buf)) < 0 && 1377 debug != 0) 1378 warnx("%s/%s: ipsec initialization failed; %s", 1379 sep->se_service, sep->se_proto, 1380 policy_out); 1381 free(buf); 1382 } else 1383 syslog(LOG_ERR, "invalid security policy \"%s\"", 1384 policy_out); 1385 } 1386 } 1387 #endif 1388 1389 /* 1390 * Finish with a service and its socket. 1391 */ 1392 void 1393 close_sep(struct servtab *sep) 1394 { 1395 if (sep->se_fd >= 0) { 1396 if (FD_ISSET(sep->se_fd, &allsock)) 1397 disable(sep); 1398 close(sep->se_fd); 1399 sep->se_fd = -1; 1400 } 1401 sep->se_count = 0; 1402 sep->se_numchild = 0; /* forget about any existing children */ 1403 } 1404 1405 int 1406 matchservent(const char *name1, const char *name2, const char *proto) 1407 { 1408 char **alias, *p; 1409 struct servent *se; 1410 1411 if (strcmp(proto, "unix") == 0) { 1412 if ((p = strrchr(name1, '/')) != NULL) 1413 name1 = p + 1; 1414 if ((p = strrchr(name2, '/')) != NULL) 1415 name2 = p + 1; 1416 } 1417 if (strcmp(name1, name2) == 0) 1418 return(1); 1419 if ((se = getservbyname(name1, proto)) != NULL) { 1420 if (strcmp(name2, se->s_name) == 0) 1421 return(1); 1422 for (alias = se->s_aliases; *alias; alias++) 1423 if (strcmp(name2, *alias) == 0) 1424 return(1); 1425 } 1426 return(0); 1427 } 1428 1429 struct servtab * 1430 enter(struct servtab *cp) 1431 { 1432 struct servtab *sep; 1433 long omask; 1434 1435 sep = (struct servtab *)malloc(sizeof (*sep)); 1436 if (sep == (struct servtab *)0) { 1437 syslog(LOG_ERR, "malloc: %m"); 1438 exit(EX_OSERR); 1439 } 1440 *sep = *cp; 1441 sep->se_fd = -1; 1442 omask = sigblock(SIGBLOCK); 1443 sep->se_next = servtab; 1444 servtab = sep; 1445 sigsetmask(omask); 1446 return (sep); 1447 } 1448 1449 void 1450 enable(struct servtab *sep) 1451 { 1452 if (debug) 1453 warnx( 1454 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1455 #ifdef SANITY_CHECK 1456 if (sep->se_fd < 0) { 1457 syslog(LOG_ERR, 1458 "%s: %s: bad fd", __func__, sep->se_service); 1459 exit(EX_SOFTWARE); 1460 } 1461 if (ISMUX(sep)) { 1462 syslog(LOG_ERR, 1463 "%s: %s: is mux", __func__, sep->se_service); 1464 exit(EX_SOFTWARE); 1465 } 1466 if (FD_ISSET(sep->se_fd, &allsock)) { 1467 syslog(LOG_ERR, 1468 "%s: %s: not off", __func__, sep->se_service); 1469 exit(EX_SOFTWARE); 1470 } 1471 nsock++; 1472 #endif 1473 FD_SET(sep->se_fd, &allsock); 1474 if (sep->se_fd > maxsock) 1475 maxsock = sep->se_fd; 1476 } 1477 1478 void 1479 disable(struct servtab *sep) 1480 { 1481 if (debug) 1482 warnx( 1483 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1484 #ifdef SANITY_CHECK 1485 if (sep->se_fd < 0) { 1486 syslog(LOG_ERR, 1487 "%s: %s: bad fd", __func__, sep->se_service); 1488 exit(EX_SOFTWARE); 1489 } 1490 if (ISMUX(sep)) { 1491 syslog(LOG_ERR, 1492 "%s: %s: is mux", __func__, sep->se_service); 1493 exit(EX_SOFTWARE); 1494 } 1495 if (!FD_ISSET(sep->se_fd, &allsock)) { 1496 syslog(LOG_ERR, 1497 "%s: %s: not on", __func__, sep->se_service); 1498 exit(EX_SOFTWARE); 1499 } 1500 if (nsock == 0) { 1501 syslog(LOG_ERR, "%s: nsock=0", __func__); 1502 exit(EX_SOFTWARE); 1503 } 1504 nsock--; 1505 #endif 1506 FD_CLR(sep->se_fd, &allsock); 1507 if (sep->se_fd == maxsock) 1508 maxsock--; 1509 } 1510 1511 FILE *fconfig = NULL; 1512 struct servtab serv; 1513 char line[LINE_MAX]; 1514 1515 int 1516 setconfig(void) 1517 { 1518 1519 if (fconfig != NULL) { 1520 fseek(fconfig, 0L, SEEK_SET); 1521 return (1); 1522 } 1523 fconfig = fopen(CONFIG, "r"); 1524 return (fconfig != NULL); 1525 } 1526 1527 void 1528 endconfig(void) 1529 { 1530 if (fconfig) { 1531 fclose(fconfig); 1532 fconfig = NULL; 1533 } 1534 } 1535 1536 struct servtab * 1537 getconfigent(void) 1538 { 1539 struct servtab *sep = &serv; 1540 int argc; 1541 char *cp, *arg, *s; 1542 char *versp; 1543 static char TCPMUX_TOKEN[] = "tcpmux/"; 1544 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1545 #ifdef IPSEC 1546 char *policy = NULL; 1547 #endif 1548 int v4bind = 0; 1549 #ifdef INET6 1550 int v6bind = 0; 1551 #endif 1552 int i; 1553 1554 more: 1555 while ((cp = nextline(fconfig)) != NULL) { 1556 #ifdef IPSEC 1557 /* lines starting with #@ is not a comment, but the policy */ 1558 if (cp[0] == '#' && cp[1] == '@') { 1559 char *p; 1560 for (p = cp + 2; p && *p && isspace(*p); p++) 1561 ; 1562 if (*p == '\0') { 1563 if (policy) 1564 free(policy); 1565 policy = NULL; 1566 } else if (ipsec_get_policylen(p) >= 0) { 1567 if (policy) 1568 free(policy); 1569 policy = newstr(p); 1570 } else { 1571 syslog(LOG_ERR, 1572 "%s: invalid ipsec policy \"%s\"", 1573 CONFIG, p); 1574 exit(EX_CONFIG); 1575 } 1576 } 1577 #endif 1578 if (*cp == '#' || *cp == '\0') 1579 continue; 1580 break; 1581 } 1582 if (cp == NULL) 1583 return ((struct servtab *)0); 1584 /* 1585 * clear the static buffer, since some fields (se_ctrladdr, 1586 * for example) don't get initialized here. 1587 */ 1588 memset(sep, 0, sizeof *sep); 1589 arg = skip(&cp); 1590 if (cp == NULL) { 1591 /* got an empty line containing just blanks/tabs. */ 1592 goto more; 1593 } 1594 if (arg[0] == ':') { /* :user:group:perm: */ 1595 char *user, *group, *perm; 1596 struct passwd *pw; 1597 struct group *gr; 1598 user = arg+1; 1599 if ((group = strchr(user, ':')) == NULL) { 1600 syslog(LOG_ERR, "no group after user '%s'", user); 1601 goto more; 1602 } 1603 *group++ = '\0'; 1604 if ((perm = strchr(group, ':')) == NULL) { 1605 syslog(LOG_ERR, "no mode after group '%s'", group); 1606 goto more; 1607 } 1608 *perm++ = '\0'; 1609 if ((pw = getpwnam(user)) == NULL) { 1610 syslog(LOG_ERR, "no such user '%s'", user); 1611 goto more; 1612 } 1613 sep->se_sockuid = pw->pw_uid; 1614 if ((gr = getgrnam(group)) == NULL) { 1615 syslog(LOG_ERR, "no such user '%s'", group); 1616 goto more; 1617 } 1618 sep->se_sockgid = gr->gr_gid; 1619 sep->se_sockmode = strtol(perm, &arg, 8); 1620 if (*arg != ':') { 1621 syslog(LOG_ERR, "bad mode '%s'", perm); 1622 goto more; 1623 } 1624 *arg++ = '\0'; 1625 } else { 1626 sep->se_sockuid = euid; 1627 sep->se_sockgid = egid; 1628 sep->se_sockmode = 0200; 1629 } 1630 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1631 char *c = arg + MUX_LEN; 1632 if (*c == '+') { 1633 sep->se_type = MUXPLUS_TYPE; 1634 c++; 1635 } else 1636 sep->se_type = MUX_TYPE; 1637 sep->se_service = newstr(c); 1638 } else { 1639 sep->se_service = newstr(arg); 1640 sep->se_type = NORM_TYPE; 1641 } 1642 arg = sskip(&cp); 1643 if (strcmp(arg, "stream") == 0) 1644 sep->se_socktype = SOCK_STREAM; 1645 else if (strcmp(arg, "dgram") == 0) 1646 sep->se_socktype = SOCK_DGRAM; 1647 else if (strcmp(arg, "rdm") == 0) 1648 sep->se_socktype = SOCK_RDM; 1649 else if (strcmp(arg, "seqpacket") == 0) 1650 sep->se_socktype = SOCK_SEQPACKET; 1651 else if (strcmp(arg, "raw") == 0) 1652 sep->se_socktype = SOCK_RAW; 1653 else 1654 sep->se_socktype = -1; 1655 1656 arg = sskip(&cp); 1657 if (strncmp(arg, "tcp", 3) == 0) { 1658 sep->se_proto = newstr(strsep(&arg, "/")); 1659 if (arg != NULL) { 1660 if (strcmp(arg, "ttcp") == 0) 1661 sep->se_type = TTCP_TYPE; 1662 else if (strcmp(arg, "faith") == 0) 1663 sep->se_type = FAITH_TYPE; 1664 } 1665 } else { 1666 if (sep->se_type == NORM_TYPE && 1667 strncmp(arg, "faith/", 6) == 0) { 1668 arg += 6; 1669 sep->se_type = FAITH_TYPE; 1670 } 1671 sep->se_proto = newstr(arg); 1672 } 1673 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1674 if (no_v4bind != 0) { 1675 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1676 sep->se_service); 1677 freeconfig(sep); 1678 goto more; 1679 } 1680 memmove(sep->se_proto, sep->se_proto + 4, 1681 strlen(sep->se_proto) + 1 - 4); 1682 sep->se_rpc = 1; 1683 sep->se_rpc_prog = sep->se_rpc_lowvers = 1684 sep->se_rpc_lowvers = 0; 1685 memcpy(&sep->se_ctrladdr4, bind_sa4, 1686 sizeof(sep->se_ctrladdr4)); 1687 if ((versp = strrchr(sep->se_service, '/'))) { 1688 *versp++ = '\0'; 1689 switch (sscanf(versp, "%u-%u", 1690 &sep->se_rpc_lowvers, 1691 &sep->se_rpc_highvers)) { 1692 case 2: 1693 break; 1694 case 1: 1695 sep->se_rpc_highvers = 1696 sep->se_rpc_lowvers; 1697 break; 1698 default: 1699 syslog(LOG_ERR, 1700 "bad RPC version specifier; %s", 1701 sep->se_service); 1702 freeconfig(sep); 1703 goto more; 1704 } 1705 } 1706 else { 1707 sep->se_rpc_lowvers = 1708 sep->se_rpc_highvers = 1; 1709 } 1710 } 1711 sep->se_nomapped = 0; 1712 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1713 #ifdef INET6 1714 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1715 if (no_v6bind != 0) { 1716 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s", 1717 sep->se_service); 1718 freeconfig(sep); 1719 goto more; 1720 } 1721 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1722 v6bind = 1; 1723 continue; 1724 } 1725 #endif 1726 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1727 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1728 v4bind = 1; 1729 continue; 1730 } 1731 /* illegal version num */ 1732 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1733 freeconfig(sep); 1734 goto more; 1735 } 1736 if (strcmp(sep->se_proto, "unix") == 0) { 1737 sep->se_family = AF_UNIX; 1738 } else 1739 #ifdef INET6 1740 if (v6bind != 0) { 1741 sep->se_family = AF_INET6; 1742 if (v4bind == 0 || no_v4bind != 0) 1743 sep->se_nomapped = 1; 1744 } else 1745 #endif 1746 { /* default to v4 bind if not v6 bind */ 1747 if (no_v4bind != 0) { 1748 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1749 sep->se_service); 1750 freeconfig(sep); 1751 goto more; 1752 } 1753 sep->se_family = AF_INET; 1754 } 1755 /* init ctladdr */ 1756 switch(sep->se_family) { 1757 case AF_INET: 1758 memcpy(&sep->se_ctrladdr4, bind_sa4, 1759 sizeof(sep->se_ctrladdr4)); 1760 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1761 break; 1762 #ifdef INET6 1763 case AF_INET6: 1764 memcpy(&sep->se_ctrladdr6, bind_sa6, 1765 sizeof(sep->se_ctrladdr6)); 1766 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1767 break; 1768 #endif 1769 case AF_UNIX: 1770 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1771 syslog(LOG_ERR, 1772 "domain socket pathname too long for service %s", 1773 sep->se_service); 1774 goto more; 1775 } 1776 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1777 sep->se_ctrladdr_un.sun_family = sep->se_family; 1778 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1779 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1780 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1781 } 1782 arg = sskip(&cp); 1783 if (!strncmp(arg, "wait", 4)) 1784 sep->se_accept = 0; 1785 else if (!strncmp(arg, "nowait", 6)) 1786 sep->se_accept = 1; 1787 else { 1788 syslog(LOG_ERR, 1789 "%s: bad wait/nowait for service %s", 1790 CONFIG, sep->se_service); 1791 goto more; 1792 } 1793 sep->se_maxchild = -1; 1794 sep->se_maxcpm = -1; 1795 sep->se_maxperip = -1; 1796 if ((s = strchr(arg, '/')) != NULL) { 1797 char *eptr; 1798 u_long val; 1799 1800 val = strtoul(s + 1, &eptr, 10); 1801 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1802 syslog(LOG_ERR, 1803 "%s: bad max-child for service %s", 1804 CONFIG, sep->se_service); 1805 goto more; 1806 } 1807 if (debug) 1808 if (!sep->se_accept && val != 1) 1809 warnx("maxchild=%lu for wait service %s" 1810 " not recommended", val, sep->se_service); 1811 sep->se_maxchild = val; 1812 if (*eptr == '/') 1813 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1814 if (*eptr == '/') 1815 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1816 /* 1817 * explicitly do not check for \0 for future expansion / 1818 * backwards compatibility 1819 */ 1820 } 1821 if (ISMUX(sep)) { 1822 /* 1823 * Silently enforce "nowait" mode for TCPMUX services 1824 * since they don't have an assigned port to listen on. 1825 */ 1826 sep->se_accept = 1; 1827 if (strcmp(sep->se_proto, "tcp")) { 1828 syslog(LOG_ERR, 1829 "%s: bad protocol for tcpmux service %s", 1830 CONFIG, sep->se_service); 1831 goto more; 1832 } 1833 if (sep->se_socktype != SOCK_STREAM) { 1834 syslog(LOG_ERR, 1835 "%s: bad socket type for tcpmux service %s", 1836 CONFIG, sep->se_service); 1837 goto more; 1838 } 1839 } 1840 sep->se_user = newstr(sskip(&cp)); 1841 #ifdef LOGIN_CAP 1842 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1843 *s = '\0'; 1844 sep->se_class = newstr(s + 1); 1845 } else 1846 sep->se_class = newstr(RESOURCE_RC); 1847 #endif 1848 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1849 *s = '\0'; 1850 sep->se_group = newstr(s + 1); 1851 } else 1852 sep->se_group = NULL; 1853 sep->se_server = newstr(sskip(&cp)); 1854 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1855 sep->se_server_name++; 1856 if (strcmp(sep->se_server, "internal") == 0) { 1857 struct biltin *bi; 1858 1859 for (bi = biltins; bi->bi_service; bi++) 1860 if (bi->bi_socktype == sep->se_socktype && 1861 matchservent(bi->bi_service, sep->se_service, 1862 sep->se_proto)) 1863 break; 1864 if (bi->bi_service == 0) { 1865 syslog(LOG_ERR, "internal service %s unknown", 1866 sep->se_service); 1867 goto more; 1868 } 1869 sep->se_accept = 1; /* force accept mode for built-ins */ 1870 sep->se_bi = bi; 1871 } else 1872 sep->se_bi = NULL; 1873 if (sep->se_maxperip < 0) 1874 sep->se_maxperip = maxperip; 1875 if (sep->se_maxcpm < 0) 1876 sep->se_maxcpm = maxcpm; 1877 if (sep->se_maxchild < 0) { /* apply default max-children */ 1878 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1879 sep->se_maxchild = sep->se_bi->bi_maxchild; 1880 else if (sep->se_accept) 1881 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1882 else 1883 sep->se_maxchild = 1; 1884 } 1885 if (sep->se_maxchild > 0) { 1886 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1887 if (sep->se_pids == NULL) { 1888 syslog(LOG_ERR, "malloc: %m"); 1889 exit(EX_OSERR); 1890 } 1891 } 1892 argc = 0; 1893 for (arg = skip(&cp); cp; arg = skip(&cp)) 1894 if (argc < MAXARGV) { 1895 sep->se_argv[argc++] = newstr(arg); 1896 } else { 1897 syslog(LOG_ERR, 1898 "%s: too many arguments for service %s", 1899 CONFIG, sep->se_service); 1900 goto more; 1901 } 1902 while (argc <= MAXARGV) 1903 sep->se_argv[argc++] = NULL; 1904 for (i = 0; i < PERIPSIZE; ++i) 1905 LIST_INIT(&sep->se_conn[i]); 1906 #ifdef IPSEC 1907 sep->se_policy = policy ? newstr(policy) : NULL; 1908 #endif 1909 return (sep); 1910 } 1911 1912 void 1913 freeconfig(struct servtab *cp) 1914 { 1915 int i; 1916 1917 if (cp->se_service) 1918 free(cp->se_service); 1919 if (cp->se_proto) 1920 free(cp->se_proto); 1921 if (cp->se_user) 1922 free(cp->se_user); 1923 if (cp->se_group) 1924 free(cp->se_group); 1925 #ifdef LOGIN_CAP 1926 if (cp->se_class) 1927 free(cp->se_class); 1928 #endif 1929 if (cp->se_server) 1930 free(cp->se_server); 1931 if (cp->se_pids) 1932 free(cp->se_pids); 1933 for (i = 0; i < MAXARGV; i++) 1934 if (cp->se_argv[i]) 1935 free(cp->se_argv[i]); 1936 free_connlist(cp); 1937 #ifdef IPSEC 1938 if (cp->se_policy) 1939 free(cp->se_policy); 1940 #endif 1941 } 1942 1943 1944 /* 1945 * Safe skip - if skip returns null, log a syntax error in the 1946 * configuration file and exit. 1947 */ 1948 char * 1949 sskip(char **cpp) 1950 { 1951 char *cp; 1952 1953 cp = skip(cpp); 1954 if (cp == NULL) { 1955 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1956 exit(EX_DATAERR); 1957 } 1958 return (cp); 1959 } 1960 1961 char * 1962 skip(char **cpp) 1963 { 1964 char *cp = *cpp; 1965 char *start; 1966 char quote = '\0'; 1967 1968 again: 1969 while (*cp == ' ' || *cp == '\t') 1970 cp++; 1971 if (*cp == '\0') { 1972 int c; 1973 1974 c = getc(fconfig); 1975 ungetc(c, fconfig); 1976 if (c == ' ' || c == '\t') 1977 if ((cp = nextline(fconfig))) 1978 goto again; 1979 *cpp = (char *)0; 1980 return ((char *)0); 1981 } 1982 if (*cp == '"' || *cp == '\'') 1983 quote = *cp++; 1984 start = cp; 1985 if (quote) 1986 while (*cp && *cp != quote) 1987 cp++; 1988 else 1989 while (*cp && *cp != ' ' && *cp != '\t') 1990 cp++; 1991 if (*cp != '\0') 1992 *cp++ = '\0'; 1993 *cpp = cp; 1994 return (start); 1995 } 1996 1997 char * 1998 nextline(FILE *fd) 1999 { 2000 char *cp; 2001 2002 if (fgets(line, sizeof (line), fd) == NULL) 2003 return ((char *)0); 2004 cp = strchr(line, '\n'); 2005 if (cp) 2006 *cp = '\0'; 2007 return (line); 2008 } 2009 2010 char * 2011 newstr(const char *cp) 2012 { 2013 char *cr; 2014 2015 if ((cr = strdup(cp != NULL ? cp : ""))) 2016 return (cr); 2017 syslog(LOG_ERR, "strdup: %m"); 2018 exit(EX_OSERR); 2019 } 2020 2021 void 2022 inetd_setproctitle(const char *a, int s) 2023 { 2024 socklen_t size; 2025 struct sockaddr_storage ss; 2026 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2027 2028 size = sizeof(ss); 2029 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2030 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2031 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); 2032 sprintf(buf, "%s [%s]", a, pbuf); 2033 } else 2034 sprintf(buf, "%s", a); 2035 setproctitle("%s", buf); 2036 } 2037 2038 int 2039 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2040 { 2041 struct servtab *se2; 2042 char pname[INET6_ADDRSTRLEN]; 2043 2044 for (se2 = servtab; se2; se2 = se2->se_next) { 2045 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2046 continue; 2047 2048 switch (se2->se_family) { 2049 case AF_INET: 2050 if (((const struct sockaddr_in *)sa)->sin_port == 2051 se2->se_ctrladdr4.sin_port) 2052 goto isloop; 2053 continue; 2054 #ifdef INET6 2055 case AF_INET6: 2056 if (((const struct sockaddr_in *)sa)->sin_port == 2057 se2->se_ctrladdr4.sin_port) 2058 goto isloop; 2059 continue; 2060 #endif 2061 default: 2062 continue; 2063 } 2064 isloop: 2065 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2066 NI_NUMERICHOST|NI_WITHSCOPEID); 2067 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2068 sep->se_service, sep->se_proto, 2069 se2->se_service, se2->se_proto, 2070 pname); 2071 return 1; 2072 } 2073 return 0; 2074 } 2075 2076 /* 2077 * print_service: 2078 * Dump relevant information to stderr 2079 */ 2080 void 2081 print_service(const char *action, const struct servtab *sep) 2082 { 2083 fprintf(stderr, 2084 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2085 #ifdef LOGIN_CAP 2086 "class=%s" 2087 #endif 2088 " builtin=%p server=%s" 2089 #ifdef IPSEC 2090 " policy=\"%s\"" 2091 #endif 2092 "\n", 2093 action, sep->se_service, sep->se_proto, 2094 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2095 #ifdef LOGIN_CAP 2096 sep->se_class, 2097 #endif 2098 (void *) sep->se_bi, sep->se_server 2099 #ifdef IPSEC 2100 , (sep->se_policy ? sep->se_policy : "") 2101 #endif 2102 ); 2103 } 2104 2105 #define CPMHSIZE 256 2106 #define CPMHMASK (CPMHSIZE-1) 2107 #define CHTGRAN 10 2108 #define CHTSIZE 6 2109 2110 typedef struct CTime { 2111 unsigned long ct_Ticks; 2112 int ct_Count; 2113 } CTime; 2114 2115 typedef struct CHash { 2116 union { 2117 struct in_addr c4_Addr; 2118 struct in6_addr c6_Addr; 2119 } cu_Addr; 2120 #define ch_Addr4 cu_Addr.c4_Addr 2121 #define ch_Addr6 cu_Addr.c6_Addr 2122 int ch_Family; 2123 time_t ch_LTime; 2124 char *ch_Service; 2125 CTime ch_Times[CHTSIZE]; 2126 } CHash; 2127 2128 CHash CHashAry[CPMHSIZE]; 2129 2130 int 2131 cpmip(const struct servtab *sep, int ctrl) 2132 { 2133 struct sockaddr_storage rss; 2134 socklen_t rssLen = sizeof(rss); 2135 int r = 0; 2136 2137 /* 2138 * If getpeername() fails, just let it through (if logging is 2139 * enabled the condition is caught elsewhere) 2140 */ 2141 2142 if (sep->se_maxcpm > 0 && 2143 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2144 time_t t = time(NULL); 2145 int hv = 0xABC3D20F; 2146 int i; 2147 int cnt = 0; 2148 CHash *chBest = NULL; 2149 unsigned int ticks = t / CHTGRAN; 2150 struct sockaddr_in *sin4; 2151 #ifdef INET6 2152 struct sockaddr_in6 *sin6; 2153 #endif 2154 2155 sin4 = (struct sockaddr_in *)&rss; 2156 #ifdef INET6 2157 sin6 = (struct sockaddr_in6 *)&rss; 2158 #endif 2159 { 2160 char *p; 2161 int addrlen; 2162 2163 switch (rss.ss_family) { 2164 case AF_INET: 2165 p = (char *)&sin4->sin_addr; 2166 addrlen = sizeof(struct in_addr); 2167 break; 2168 #ifdef INET6 2169 case AF_INET6: 2170 p = (char *)&sin6->sin6_addr; 2171 addrlen = sizeof(struct in6_addr); 2172 break; 2173 #endif 2174 default: 2175 /* should not happen */ 2176 return -1; 2177 } 2178 2179 for (i = 0; i < addrlen; ++i, ++p) { 2180 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2181 } 2182 hv = (hv ^ (hv >> 16)); 2183 } 2184 for (i = 0; i < 5; ++i) { 2185 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2186 2187 if (rss.ss_family == AF_INET && 2188 ch->ch_Family == AF_INET && 2189 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2190 ch->ch_Service && strcmp(sep->se_service, 2191 ch->ch_Service) == 0) { 2192 chBest = ch; 2193 break; 2194 } 2195 #ifdef INET6 2196 if (rss.ss_family == AF_INET6 && 2197 ch->ch_Family == AF_INET6 && 2198 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2199 &ch->ch_Addr6) != 0 && 2200 ch->ch_Service && strcmp(sep->se_service, 2201 ch->ch_Service) == 0) { 2202 chBest = ch; 2203 break; 2204 } 2205 #endif 2206 if (chBest == NULL || ch->ch_LTime == 0 || 2207 ch->ch_LTime < chBest->ch_LTime) { 2208 chBest = ch; 2209 } 2210 } 2211 if ((rss.ss_family == AF_INET && 2212 (chBest->ch_Family != AF_INET || 2213 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2214 chBest->ch_Service == NULL || 2215 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2216 chBest->ch_Family = sin4->sin_family; 2217 chBest->ch_Addr4 = sin4->sin_addr; 2218 if (chBest->ch_Service) 2219 free(chBest->ch_Service); 2220 chBest->ch_Service = strdup(sep->se_service); 2221 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2222 } 2223 #ifdef INET6 2224 if ((rss.ss_family == AF_INET6 && 2225 (chBest->ch_Family != AF_INET6 || 2226 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2227 &chBest->ch_Addr6) == 0)) || 2228 chBest->ch_Service == NULL || 2229 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2230 chBest->ch_Family = sin6->sin6_family; 2231 chBest->ch_Addr6 = sin6->sin6_addr; 2232 if (chBest->ch_Service) 2233 free(chBest->ch_Service); 2234 chBest->ch_Service = strdup(sep->se_service); 2235 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2236 } 2237 #endif 2238 chBest->ch_LTime = t; 2239 { 2240 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2241 if (ct->ct_Ticks != ticks) { 2242 ct->ct_Ticks = ticks; 2243 ct->ct_Count = 0; 2244 } 2245 ++ct->ct_Count; 2246 } 2247 for (i = 0; i < CHTSIZE; ++i) { 2248 CTime *ct = &chBest->ch_Times[i]; 2249 if (ct->ct_Ticks <= ticks && 2250 ct->ct_Ticks >= ticks - CHTSIZE) { 2251 cnt += ct->ct_Count; 2252 } 2253 } 2254 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) { 2255 char pname[INET6_ADDRSTRLEN]; 2256 2257 getnameinfo((struct sockaddr *)&rss, 2258 ((struct sockaddr *)&rss)->sa_len, 2259 pname, sizeof(pname), NULL, 0, 2260 NI_NUMERICHOST|NI_WITHSCOPEID); 2261 r = -1; 2262 syslog(LOG_ERR, 2263 "%s from %s exceeded counts/min (limit %d/min)", 2264 sep->se_service, pname, 2265 sep->se_maxcpm); 2266 } 2267 } 2268 return(r); 2269 } 2270 2271 static struct conninfo * 2272 search_conn(struct servtab *sep, int ctrl) 2273 { 2274 struct sockaddr_storage ss; 2275 socklen_t sslen = sizeof(ss); 2276 struct conninfo *conn; 2277 int hv; 2278 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2279 2280 if (sep->se_maxperip <= 0) 2281 return NULL; 2282 2283 /* 2284 * If getpeername() fails, just let it through (if logging is 2285 * enabled the condition is caught elsewhere) 2286 */ 2287 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2288 return NULL; 2289 2290 switch (ss.ss_family) { 2291 case AF_INET: 2292 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2293 sizeof(struct in_addr)); 2294 break; 2295 #ifdef INET6 2296 case AF_INET6: 2297 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2298 sizeof(struct in6_addr)); 2299 break; 2300 #endif 2301 default: 2302 /* 2303 * Since we only support AF_INET and AF_INET6, just 2304 * let other than AF_INET and AF_INET6 through. 2305 */ 2306 return NULL; 2307 } 2308 2309 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2310 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 2311 return NULL; 2312 2313 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2314 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2315 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2316 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 && 2317 strcmp(pname, pname2) == 0) 2318 break; 2319 } 2320 2321 if (conn == NULL) { 2322 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2323 syslog(LOG_ERR, "malloc: %m"); 2324 exit(EX_OSERR); 2325 } 2326 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2327 if (conn->co_proc == NULL) { 2328 syslog(LOG_ERR, "malloc: %m"); 2329 exit(EX_OSERR); 2330 } 2331 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2332 conn->co_numchild = 0; 2333 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2334 } 2335 2336 /* 2337 * Since a child process is not invoked yet, we cannot 2338 * determine a pid of a child. So, co_proc and co_numchild 2339 * should be filled leter. 2340 */ 2341 2342 return conn; 2343 } 2344 2345 static int 2346 room_conn(struct servtab *sep, struct conninfo *conn) 2347 { 2348 char pname[NI_MAXHOST]; 2349 2350 if (conn->co_numchild >= sep->se_maxperip) { 2351 getnameinfo((struct sockaddr *)&conn->co_addr, 2352 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2353 NI_NUMERICHOST | NI_WITHSCOPEID); 2354 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2355 sep->se_service, pname, sep->se_maxperip); 2356 return 0; 2357 } 2358 return 1; 2359 } 2360 2361 static void 2362 addchild_conn(struct conninfo *conn, pid_t pid) 2363 { 2364 struct procinfo *proc; 2365 2366 if (conn == NULL) 2367 return; 2368 2369 if ((proc = search_proc(pid, 1)) != NULL) { 2370 if (proc->pr_conn != NULL) { 2371 syslog(LOG_ERR, 2372 "addchild_conn: child already on process list"); 2373 exit(EX_OSERR); 2374 } 2375 proc->pr_conn = conn; 2376 } 2377 2378 conn->co_proc[conn->co_numchild++] = proc; 2379 } 2380 2381 static void 2382 reapchild_conn(pid_t pid) 2383 { 2384 struct procinfo *proc; 2385 struct conninfo *conn; 2386 int i; 2387 2388 if ((proc = search_proc(pid, 0)) == NULL) 2389 return; 2390 if ((conn = proc->pr_conn) == NULL) 2391 return; 2392 for (i = 0; i < conn->co_numchild; ++i) 2393 if (conn->co_proc[i] == proc) { 2394 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2395 break; 2396 } 2397 free_proc(proc); 2398 free_conn(conn); 2399 } 2400 2401 static void 2402 resize_conn(struct servtab *sep, int maxpip) 2403 { 2404 struct conninfo *conn; 2405 int i, j; 2406 2407 if (sep->se_maxperip <= 0) 2408 return; 2409 if (maxpip <= 0) { 2410 free_connlist(sep); 2411 return; 2412 } 2413 for (i = 0; i < PERIPSIZE; ++i) { 2414 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2415 for (j = maxpip; j < conn->co_numchild; ++j) 2416 free_proc(conn->co_proc[j]); 2417 conn->co_proc = realloc(conn->co_proc, 2418 maxpip * sizeof(*conn->co_proc)); 2419 if (conn->co_proc == NULL) { 2420 syslog(LOG_ERR, "realloc: %m"); 2421 exit(EX_OSERR); 2422 } 2423 if (conn->co_numchild > maxpip) 2424 conn->co_numchild = maxpip; 2425 } 2426 } 2427 } 2428 2429 static void 2430 free_connlist(struct servtab *sep) 2431 { 2432 struct conninfo *conn; 2433 int i, j; 2434 2435 for (i = 0; i < PERIPSIZE; ++i) { 2436 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2437 for (j = 0; j < conn->co_numchild; ++j) 2438 free_proc(conn->co_proc[j]); 2439 conn->co_numchild = 0; 2440 free_conn(conn); 2441 } 2442 } 2443 } 2444 2445 static void 2446 free_conn(struct conninfo *conn) 2447 { 2448 if (conn == NULL) 2449 return; 2450 if (conn->co_numchild <= 0) { 2451 LIST_REMOVE(conn, co_link); 2452 free(conn->co_proc); 2453 free(conn); 2454 } 2455 } 2456 2457 static struct procinfo * 2458 search_proc(pid_t pid, int add) 2459 { 2460 struct procinfo *proc; 2461 int hv; 2462 2463 hv = hashval((char *)&pid, sizeof(pid)); 2464 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2465 if (proc->pr_pid == pid) 2466 break; 2467 } 2468 if (proc == NULL && add) { 2469 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2470 syslog(LOG_ERR, "malloc: %m"); 2471 exit(EX_OSERR); 2472 } 2473 proc->pr_pid = pid; 2474 proc->pr_conn = NULL; 2475 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2476 } 2477 return proc; 2478 } 2479 2480 static void 2481 free_proc(struct procinfo *proc) 2482 { 2483 if (proc == NULL) 2484 return; 2485 LIST_REMOVE(proc, pr_link); 2486 free(proc); 2487 } 2488 2489 static int 2490 hashval(char *p, int len) 2491 { 2492 int i, hv = 0xABC3D20F; 2493 2494 for (i = 0; i < len; ++i, ++p) 2495 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2496 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2497 return hv; 2498 } 2499