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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $"; 46 #endif /* not lint */ 47 48 /* 49 * Inetd - Internet super-server 50 * 51 * This program invokes all internet services as needed. Connection-oriented 52 * services are invoked each time a connection is made, by creating a process. 53 * This process is passed the connection as file descriptor 0 and is expected 54 * to do a getpeername to find out the source host and port. 55 * 56 * Datagram oriented services are invoked when a datagram 57 * arrives; a process is created and passed a pending message 58 * on file descriptor 0. Datagram servers may either connect 59 * to their peer, freeing up the original socket for inetd 60 * to receive further messages on, or ``take over the socket'', 61 * processing all arriving datagrams and, eventually, timing 62 * out. The first type of server is said to be ``multi-threaded''; 63 * the second type of server ``single-threaded''. 64 * 65 * Inetd uses a configuration file which is read at startup 66 * and, possibly, at some later time in response to a hangup signal. 67 * The configuration file is ``free format'' with fields given in the 68 * order shown below. Continuation lines for an entry must begin with 69 * a space or tab. All fields must be present in each entry. 70 * 71 * service name must be in /etc/services 72 * or name a tcpmux service 73 * or specify a unix domain socket 74 * socket type stream/dgram/raw/rdm/seqpacket 75 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix 76 * wait/nowait single-threaded/multi-threaded 77 * user user to run daemon as 78 * server program full path name 79 * server program arguments maximum of MAXARGS (20) 80 * 81 * TCP services without official port numbers are handled with the 82 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 83 * requests. When a connection is made from a foreign host, the service 84 * requested is passed to tcpmux, which looks it up in the servtab list 85 * and returns the proper entry for the service. Tcpmux returns a 86 * negative reply if the service doesn't exist, otherwise the invoked 87 * server is expected to return the positive reply if the service type in 88 * inetd.conf file has the prefix "tcpmux/". If the service type has the 89 * prefix "tcpmux/+", tcpmux will return the positive reply for the 90 * process; this is for compatibility with older server code, and also 91 * allows you to invoke programs that use stdin/stdout without putting any 92 * special server code in them. Services that use tcpmux are "nowait" 93 * because they do not have a well-known port and hence cannot listen 94 * for new requests. 95 * 96 * For RPC services 97 * service name/version must be in /etc/rpc 98 * socket type stream/dgram/raw/rdm/seqpacket 99 * protocol rpc/tcp, rpc/udp 100 * wait/nowait single-threaded/multi-threaded 101 * user user to run daemon as 102 * server program full path name 103 * server program arguments maximum of MAXARGS 104 * 105 * Comment lines are indicated by a `#' in column 1. 106 * 107 * #ifdef IPSEC 108 * Comment lines that start with "#@" denote IPsec policy string, as described 109 * in ipsec_set_policy(3). This will affect all the following items in 110 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 111 * there's no IPsec policy. 112 * #endif 113 */ 114 #include <sys/param.h> 115 #include <sys/ioctl.h> 116 #include <sys/wait.h> 117 #include <sys/time.h> 118 #include <sys/resource.h> 119 #include <sys/stat.h> 120 #include <sys/un.h> 121 122 #include <netinet/in.h> 123 #include <netinet/tcp.h> 124 #include <arpa/inet.h> 125 #include <rpc/rpc.h> 126 #include <rpc/pmap_clnt.h> 127 128 #include <errno.h> 129 #include <err.h> 130 #include <fcntl.h> 131 #include <grp.h> 132 #include <netdb.h> 133 #include <pwd.h> 134 #include <signal.h> 135 #include <stdio.h> 136 #include <stdlib.h> 137 #include <string.h> 138 #include <syslog.h> 139 #include <tcpd.h> 140 #include <unistd.h> 141 #include <libutil.h> 142 #include <sysexits.h> 143 #include <ctype.h> 144 145 #include "inetd.h" 146 #include "pathnames.h" 147 148 #ifdef IPSEC 149 #include <netinet6/ipsec.h> 150 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 151 #undef IPSEC 152 #endif 153 #endif 154 155 /* wrapper for KAME-special getnameinfo() */ 156 #ifndef NI_WITHSCOPEID 157 #define NI_WITHSCOPEID 0 158 #endif 159 160 #ifndef LIBWRAP_ALLOW_FACILITY 161 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 162 #endif 163 #ifndef LIBWRAP_ALLOW_SEVERITY 164 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 165 #endif 166 #ifndef LIBWRAP_DENY_FACILITY 167 # define LIBWRAP_DENY_FACILITY LOG_AUTH 168 #endif 169 #ifndef LIBWRAP_DENY_SEVERITY 170 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 171 #endif 172 173 #define ISWRAP(sep) \ 174 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 175 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 176 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 177 || (sep)->se_socktype == SOCK_DGRAM)) 178 179 #ifdef LOGIN_CAP 180 #include <login_cap.h> 181 182 /* see init.c */ 183 #define RESOURCE_RC "daemon" 184 185 #endif 186 187 #ifndef MAXCHILD 188 #define MAXCHILD -1 /* maximum number of this service 189 < 0 = no limit */ 190 #endif 191 192 #ifndef MAXCPM 193 #define MAXCPM -1 /* rate limit invocations from a 194 single remote address, 195 < 0 = no limit */ 196 #endif 197 198 #ifndef MAXPERIP 199 #define MAXPERIP -1 /* maximum number of this service 200 from a single remote address, 201 < 0 = no limit */ 202 #endif 203 204 #ifndef TOOMANY 205 #define TOOMANY 256 /* don't start more than TOOMANY */ 206 #endif 207 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 208 #define RETRYTIME (60*10) /* retry after bind or server fail */ 209 #define MAX_MAXCHLD 32767 /* max allowable max children */ 210 211 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 212 213 void close_sep __P((struct servtab *)); 214 void flag_signal __P((int)); 215 void flag_config __P((int)); 216 void config __P((void)); 217 int cpmip __P((const struct servtab *, int)); 218 void endconfig __P((void)); 219 struct servtab *enter __P((struct servtab *)); 220 void freeconfig __P((struct servtab *)); 221 struct servtab *getconfigent __P((void)); 222 int matchservent __P((const char *, const char *, const char *)); 223 char *nextline __P((FILE *)); 224 void addchild __P((struct servtab *, int)); 225 void flag_reapchild __P((int)); 226 void reapchild __P((void)); 227 void enable __P((struct servtab *)); 228 void disable __P((struct servtab *)); 229 void flag_retry __P((int)); 230 void retry __P((void)); 231 int setconfig __P((void)); 232 void setup __P((struct servtab *)); 233 #ifdef IPSEC 234 void ipsecsetup __P((struct servtab *)); 235 #endif 236 void unregisterrpc __P((register struct servtab *sep)); 237 static struct conninfo *search_conn __P((struct servtab *sep, int ctrl)); 238 static int room_conn __P((struct servtab *sep, struct conninfo *conn)); 239 static void addchild_conn __P((struct conninfo *conn, pid_t pid)); 240 static void reapchild_conn __P((pid_t pid)); 241 static void free_conn __P((struct conninfo *conn)); 242 static void resize_conn __P((struct servtab *sep, int maxperip)); 243 static void free_connlist __P((struct servtab *sep)); 244 static void free_proc __P((struct procinfo *)); 245 static struct procinfo *search_proc __P((pid_t pid, int add)); 246 static int hashval __P((char *p, int len)); 247 248 int allow_severity; 249 int deny_severity; 250 int wrap_ex = 0; 251 int wrap_bi = 0; 252 int debug = 0; 253 int log = 0; 254 int maxsock; /* highest-numbered descriptor */ 255 fd_set allsock; 256 int options; 257 int timingout; 258 int toomany = TOOMANY; 259 int maxchild = MAXCHILD; 260 int maxcpm = MAXCPM; 261 int maxperip = MAXPERIP; 262 struct servent *sp; 263 struct rpcent *rpc; 264 char *hostname = NULL; 265 struct sockaddr_in *bind_sa4; 266 int no_v4bind = 1; 267 #ifdef INET6 268 struct sockaddr_in6 *bind_sa6; 269 int no_v6bind = 1; 270 #endif 271 int signalpipe[2]; 272 #ifdef SANITY_CHECK 273 int nsock; 274 #endif 275 uid_t euid; 276 gid_t egid; 277 mode_t mask; 278 279 struct servtab *servtab; 280 281 extern struct biltin biltins[]; 282 283 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 284 const char *CONFIG = _PATH_INETDCONF; 285 const char *pid_file = _PATH_INETDPID; 286 287 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 288 289 int 290 getvalue(arg, value, whine) 291 const char *arg, *whine; 292 int *value; 293 { 294 int tmp; 295 char *p; 296 297 tmp = strtol(arg, &p, 0); 298 if (tmp < 0 || *p) { 299 syslog(LOG_ERR, whine, arg); 300 return 1; /* failure */ 301 } 302 *value = tmp; 303 return 0; /* success */ 304 } 305 306 static sa_family_t 307 whichaf(struct request_info *req) 308 { 309 struct sockaddr *sa; 310 311 sa = (struct sockaddr *)req->client->sin; 312 if (sa == NULL) 313 return AF_UNSPEC; 314 if (sa->sa_family == AF_INET6 && 315 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr)) 316 return AF_INET; 317 return sa->sa_family; 318 } 319 320 int 321 main(argc, argv) 322 int argc; 323 char *argv[]; 324 { 325 struct servtab *sep; 326 struct passwd *pwd; 327 struct group *grp; 328 struct sigaction sa, saalrm, sachld, sahup, sapipe; 329 int tmpint, ch, dofork; 330 pid_t pid; 331 char buf[50]; 332 #ifdef LOGIN_CAP 333 login_cap_t *lc = NULL; 334 #endif 335 struct request_info req; 336 int denied; 337 char *service = NULL; 338 union { 339 struct sockaddr peer_un; 340 struct sockaddr_in peer_un4; 341 struct sockaddr_in6 peer_un6; 342 struct sockaddr_storage peer_max; 343 } p_un; 344 #define peer p_un.peer_un 345 #define peer4 p_un.peer_un4 346 #define peer6 p_un.peer_un6 347 #define peermax p_un.peer_max 348 int i; 349 struct addrinfo hints, *res; 350 const char *servname; 351 int error; 352 struct conninfo *conn; 353 354 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 355 356 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 357 switch(ch) { 358 case 'd': 359 debug = 1; 360 options |= SO_DEBUG; 361 break; 362 case 'l': 363 log = 1; 364 break; 365 case 'R': 366 getvalue(optarg, &toomany, 367 "-R %s: bad value for service invocation rate"); 368 break; 369 case 'c': 370 getvalue(optarg, &maxchild, 371 "-c %s: bad value for maximum children"); 372 break; 373 case 'C': 374 getvalue(optarg, &maxcpm, 375 "-C %s: bad value for maximum children/minute"); 376 break; 377 case 'a': 378 hostname = optarg; 379 break; 380 case 'p': 381 pid_file = optarg; 382 break; 383 case 's': 384 getvalue(optarg, &maxperip, 385 "-s %s: bad value for maximum children per source address"); 386 break; 387 case 'w': 388 wrap_ex++; 389 break; 390 case 'W': 391 wrap_bi++; 392 break; 393 case '?': 394 default: 395 syslog(LOG_ERR, 396 "usage: inetd [-dlwW] [-a address] [-R rate]" 397 " [-c maximum] [-C rate]" 398 " [-p pidfile] [conf-file]"); 399 exit(EX_USAGE); 400 } 401 /* 402 * Initialize Bind Addrs. 403 * When hostname is NULL, wild card bind addrs are obtained from 404 * getaddrinfo(). But getaddrinfo() requires at least one of 405 * hostname or servname is non NULL. 406 * So when hostname is NULL, set dummy value to servname. 407 */ 408 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL; 409 410 bzero(&hints, sizeof(struct addrinfo)); 411 hints.ai_flags = AI_PASSIVE; 412 hints.ai_family = AF_UNSPEC; 413 error = getaddrinfo(hostname, servname, &hints, &res); 414 if (error != 0) { 415 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 416 if (error == EAI_SYSTEM) 417 syslog(LOG_ERR, "%s", strerror(errno)); 418 exit(EX_USAGE); 419 } 420 do { 421 if (res->ai_addr == NULL) { 422 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 423 exit(EX_USAGE); 424 } 425 switch (res->ai_addr->sa_family) { 426 case AF_INET: 427 if (no_v4bind == 0) 428 continue; 429 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 430 /* init port num in case servname is dummy */ 431 bind_sa4->sin_port = 0; 432 no_v4bind = 0; 433 continue; 434 #ifdef INET6 435 case AF_INET6: 436 if (no_v6bind == 0) 437 continue; 438 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 439 /* init port num in case servname is dummy */ 440 bind_sa6->sin6_port = 0; 441 no_v6bind = 0; 442 continue; 443 #endif 444 } 445 if (no_v4bind == 0 446 #ifdef INET6 447 && no_v6bind == 0 448 #endif 449 ) 450 break; 451 } while ((res = res->ai_next) != NULL); 452 if (no_v4bind != 0 453 #ifdef INET6 454 && no_v6bind != 0 455 #endif 456 ) { 457 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 458 exit(EX_USAGE); 459 } 460 461 euid = geteuid(); 462 egid = getegid(); 463 umask(mask = umask(0777)); 464 465 argc -= optind; 466 argv += optind; 467 468 if (argc > 0) 469 CONFIG = argv[0]; 470 if (debug == 0) { 471 FILE *fp; 472 if (daemon(0, 0) < 0) { 473 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 474 } 475 /* From now on we don't want syslog messages going to stderr. */ 476 closelog(); 477 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 478 /* 479 * In case somebody has started inetd manually, we need to 480 * clear the logname, so that old servers run as root do not 481 * get the user's logname.. 482 */ 483 if (setlogin("") < 0) { 484 syslog(LOG_WARNING, "cannot clear logname: %m"); 485 /* no big deal if it fails.. */ 486 } 487 pid = getpid(); 488 fp = fopen(pid_file, "w"); 489 if (fp) { 490 fprintf(fp, "%ld\n", (long)pid); 491 fclose(fp); 492 } else { 493 syslog(LOG_WARNING, "%s: %m", pid_file); 494 } 495 } 496 for (i = 0; i < PERIPSIZE; ++i) 497 LIST_INIT(&proctable[i]); 498 sa.sa_flags = 0; 499 sigemptyset(&sa.sa_mask); 500 sigaddset(&sa.sa_mask, SIGALRM); 501 sigaddset(&sa.sa_mask, SIGCHLD); 502 sigaddset(&sa.sa_mask, SIGHUP); 503 sa.sa_handler = flag_retry; 504 sigaction(SIGALRM, &sa, &saalrm); 505 config(); 506 sa.sa_handler = flag_config; 507 sigaction(SIGHUP, &sa, &sahup); 508 sa.sa_handler = flag_reapchild; 509 sigaction(SIGCHLD, &sa, &sachld); 510 sa.sa_handler = SIG_IGN; 511 sigaction(SIGPIPE, &sa, &sapipe); 512 513 { 514 /* space for daemons to overwrite environment for ps */ 515 #define DUMMYSIZE 100 516 char dummy[DUMMYSIZE]; 517 518 (void)memset(dummy, 'x', DUMMYSIZE - 1); 519 dummy[DUMMYSIZE - 1] = '\0'; 520 (void)setenv("inetd_dummy", dummy, 1); 521 } 522 523 if (pipe(signalpipe) != 0) { 524 syslog(LOG_ERR, "pipe: %m"); 525 exit(EX_OSERR); 526 } 527 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 || 528 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) { 529 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m"); 530 exit(EX_OSERR); 531 } 532 FD_SET(signalpipe[0], &allsock); 533 #ifdef SANITY_CHECK 534 nsock++; 535 #endif 536 if (signalpipe[0] > maxsock) 537 maxsock = signalpipe[0]; 538 if (signalpipe[1] > maxsock) 539 maxsock = signalpipe[1]; 540 541 for (;;) { 542 int n, ctrl; 543 fd_set readable; 544 545 #ifdef SANITY_CHECK 546 if (nsock == 0) { 547 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); 548 exit(EX_SOFTWARE); 549 } 550 #endif 551 readable = allsock; 552 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 553 (fd_set *)0, (struct timeval *)0)) <= 0) { 554 if (n < 0 && errno != EINTR) { 555 syslog(LOG_WARNING, "select: %m"); 556 sleep(1); 557 } 558 continue; 559 } 560 /* handle any queued signal flags */ 561 if (FD_ISSET(signalpipe[0], &readable)) { 562 int nsig; 563 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 564 syslog(LOG_ERR, "ioctl: %m"); 565 exit(EX_OSERR); 566 } 567 while (--nsig >= 0) { 568 char c; 569 if (read(signalpipe[0], &c, 1) != 1) { 570 syslog(LOG_ERR, "read: %m"); 571 exit(EX_OSERR); 572 } 573 if (debug) 574 warnx("handling signal flag %c", c); 575 switch(c) { 576 case 'A': /* sigalrm */ 577 retry(); 578 break; 579 case 'C': /* sigchld */ 580 reapchild(); 581 break; 582 case 'H': /* sighup */ 583 config(); 584 break; 585 } 586 } 587 } 588 for (sep = servtab; n && sep; sep = sep->se_next) 589 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 590 n--; 591 if (debug) 592 warnx("someone wants %s", sep->se_service); 593 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 594 conn = NULL; 595 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 596 i = 1; 597 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 598 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 599 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 600 (socklen_t *)0); 601 if (debug) 602 warnx("accept, ctrl %d", ctrl); 603 if (ctrl < 0) { 604 if (errno != EINTR) 605 syslog(LOG_WARNING, 606 "accept (for %s): %m", 607 sep->se_service); 608 if (sep->se_accept && 609 sep->se_socktype == SOCK_STREAM) 610 close(ctrl); 611 continue; 612 } 613 i = 0; 614 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 615 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 616 if (ioctl(ctrl, FIONBIO, &i) < 0) 617 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 618 if (cpmip(sep, ctrl) < 0) { 619 close(ctrl); 620 continue; 621 } 622 if (dofork && 623 (conn = search_conn(sep, ctrl)) != NULL && 624 !room_conn(sep, conn)) { 625 close(ctrl); 626 continue; 627 } 628 } else 629 ctrl = sep->se_fd; 630 if (log && !ISWRAP(sep)) { 631 char pname[INET6_ADDRSTRLEN] = "unknown"; 632 socklen_t sl; 633 sl = sizeof peermax; 634 if (getpeername(ctrl, (struct sockaddr *) 635 &peermax, &sl)) { 636 sl = sizeof peermax; 637 if (recvfrom(ctrl, buf, sizeof(buf), 638 MSG_PEEK, 639 (struct sockaddr *)&peermax, 640 &sl) >= 0) { 641 getnameinfo((struct sockaddr *)&peermax, 642 peer.sa_len, 643 pname, sizeof(pname), 644 NULL, 0, 645 NI_NUMERICHOST| 646 NI_WITHSCOPEID); 647 } 648 } else { 649 getnameinfo((struct sockaddr *)&peermax, 650 peer.sa_len, 651 pname, sizeof(pname), 652 NULL, 0, 653 NI_NUMERICHOST| 654 NI_WITHSCOPEID); 655 } 656 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 657 } 658 (void) sigblock(SIGBLOCK); 659 pid = 0; 660 /* 661 * Fork for all external services, builtins which need to 662 * fork and anything we're wrapping (as wrapping might 663 * block or use hosts_options(5) twist). 664 */ 665 if (dofork) { 666 if (sep->se_count++ == 0) 667 (void)gettimeofday(&sep->se_time, (struct timezone *)NULL); 668 else if (toomany > 0 && sep->se_count >= toomany) { 669 struct timeval now; 670 671 (void)gettimeofday(&now, (struct timezone *)NULL); 672 if (now.tv_sec - sep->se_time.tv_sec > 673 CNT_INTVL) { 674 sep->se_time = now; 675 sep->se_count = 1; 676 } else { 677 syslog(LOG_ERR, 678 "%s/%s server failing (looping), service terminated", 679 sep->se_service, sep->se_proto); 680 if (sep->se_accept && 681 sep->se_socktype == SOCK_STREAM) 682 close(ctrl); 683 close_sep(sep); 684 free_conn(conn); 685 sigsetmask(0L); 686 if (!timingout) { 687 timingout = 1; 688 alarm(RETRYTIME); 689 } 690 continue; 691 } 692 } 693 pid = fork(); 694 } 695 if (pid < 0) { 696 syslog(LOG_ERR, "fork: %m"); 697 if (sep->se_accept && 698 sep->se_socktype == SOCK_STREAM) 699 close(ctrl); 700 free_conn(conn); 701 sigsetmask(0L); 702 sleep(1); 703 continue; 704 } 705 if (pid) { 706 addchild_conn(conn, pid); 707 addchild(sep, pid); 708 } 709 sigsetmask(0L); 710 if (pid == 0) { 711 if (dofork) { 712 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 713 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 714 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 715 /* SIGPIPE reset before exec */ 716 } 717 /* 718 * Call tcpmux to find the real service to exec. 719 */ 720 if (sep->se_bi && 721 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 722 sep = tcpmux(ctrl); 723 if (sep == NULL) { 724 close(ctrl); 725 _exit(0); 726 } 727 } 728 if (ISWRAP(sep)) { 729 inetd_setproctitle("wrapping", ctrl); 730 service = sep->se_server_name ? 731 sep->se_server_name : sep->se_service; 732 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL); 733 fromhost(&req); 734 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 735 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 736 denied = !hosts_access(&req); 737 if (denied) { 738 syslog(deny_severity, 739 "refused connection from %.500s, service %s (%s%s)", 740 eval_client(&req), service, sep->se_proto, 741 (whichaf(&req) == AF_INET6) ? "6" : ""); 742 if (sep->se_socktype != SOCK_STREAM) 743 recv(ctrl, buf, sizeof (buf), 0); 744 if (dofork) { 745 sleep(1); 746 _exit(0); 747 } 748 } 749 if (log) { 750 syslog(allow_severity, 751 "connection from %.500s, service %s (%s%s)", 752 eval_client(&req), service, sep->se_proto, 753 (whichaf(&req) == AF_INET6) ? "6" : ""); 754 } 755 } 756 if (sep->se_bi) { 757 (*sep->se_bi->bi_fn)(ctrl, sep); 758 } else { 759 if (debug) 760 warnx("%d execl %s", 761 getpid(), sep->se_server); 762 /* Clear close-on-exec. */ 763 if (fcntl(ctrl, F_SETFD, 0) < 0) { 764 syslog(LOG_ERR, 765 "%s/%s: fcntl (F_SETFD, 0): %m", 766 sep->se_service, sep->se_proto); 767 _exit(EX_OSERR); 768 } 769 if (ctrl != 0) { 770 dup2(ctrl, 0); 771 close(ctrl); 772 } 773 dup2(0, 1); 774 dup2(0, 2); 775 if ((pwd = getpwnam(sep->se_user)) == NULL) { 776 syslog(LOG_ERR, 777 "%s/%s: %s: no such user", 778 sep->se_service, sep->se_proto, 779 sep->se_user); 780 if (sep->se_socktype != SOCK_STREAM) 781 recv(0, buf, sizeof (buf), 0); 782 _exit(EX_NOUSER); 783 } 784 grp = NULL; 785 if ( sep->se_group != NULL 786 && (grp = getgrnam(sep->se_group)) == NULL 787 ) { 788 syslog(LOG_ERR, 789 "%s/%s: %s: no such group", 790 sep->se_service, sep->se_proto, 791 sep->se_group); 792 if (sep->se_socktype != SOCK_STREAM) 793 recv(0, buf, sizeof (buf), 0); 794 _exit(EX_NOUSER); 795 } 796 if (grp != NULL) 797 pwd->pw_gid = grp->gr_gid; 798 #ifdef LOGIN_CAP 799 if ((lc = login_getclass(sep->se_class)) == NULL) { 800 /* error syslogged by getclass */ 801 syslog(LOG_ERR, 802 "%s/%s: %s: login class error", 803 sep->se_service, sep->se_proto, 804 sep->se_class); 805 if (sep->se_socktype != SOCK_STREAM) 806 recv(0, buf, sizeof (buf), 0); 807 _exit(EX_NOUSER); 808 } 809 #endif 810 if (setsid() < 0) { 811 syslog(LOG_ERR, 812 "%s: can't setsid(): %m", 813 sep->se_service); 814 /* _exit(EX_OSERR); not fatal yet */ 815 } 816 #ifdef LOGIN_CAP 817 if (setusercontext(lc, pwd, pwd->pw_uid, 818 LOGIN_SETALL) != 0) { 819 syslog(LOG_ERR, 820 "%s: can't setusercontext(..%s..): %m", 821 sep->se_service, sep->se_user); 822 _exit(EX_OSERR); 823 } 824 login_close(lc); 825 #else 826 if (pwd->pw_uid) { 827 if (setlogin(sep->se_user) < 0) { 828 syslog(LOG_ERR, 829 "%s: can't setlogin(%s): %m", 830 sep->se_service, sep->se_user); 831 /* _exit(EX_OSERR); not yet */ 832 } 833 if (setgid(pwd->pw_gid) < 0) { 834 syslog(LOG_ERR, 835 "%s: can't set gid %d: %m", 836 sep->se_service, pwd->pw_gid); 837 _exit(EX_OSERR); 838 } 839 (void) initgroups(pwd->pw_name, 840 pwd->pw_gid); 841 if (setuid(pwd->pw_uid) < 0) { 842 syslog(LOG_ERR, 843 "%s: can't set uid %d: %m", 844 sep->se_service, pwd->pw_uid); 845 _exit(EX_OSERR); 846 } 847 } 848 #endif 849 sigaction(SIGPIPE, &sapipe, 850 (struct sigaction *)0); 851 execv(sep->se_server, sep->se_argv); 852 syslog(LOG_ERR, 853 "cannot execute %s: %m", sep->se_server); 854 if (sep->se_socktype != SOCK_STREAM) 855 recv(0, buf, sizeof (buf), 0); 856 } 857 if (dofork) 858 _exit(0); 859 } 860 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 861 close(ctrl); 862 } 863 } 864 } 865 866 /* 867 * Add a signal flag to the signal flag queue for later handling 868 */ 869 870 void 871 flag_signal(c) 872 int c; 873 { 874 char ch = c; 875 876 if (write(signalpipe[1], &ch, 1) != 1) { 877 syslog(LOG_ERR, "write: %m"); 878 _exit(EX_OSERR); 879 } 880 } 881 882 /* 883 * Record a new child pid for this service. If we've reached the 884 * limit on children, then stop accepting incoming requests. 885 */ 886 887 void 888 addchild(struct servtab *sep, pid_t pid) 889 { 890 if (sep->se_maxchild <= 0) 891 return; 892 #ifdef SANITY_CHECK 893 if (sep->se_numchild >= sep->se_maxchild) { 894 syslog(LOG_ERR, "%s: %d >= %d", 895 __FUNCTION__, sep->se_numchild, sep->se_maxchild); 896 exit(EX_SOFTWARE); 897 } 898 #endif 899 sep->se_pids[sep->se_numchild++] = pid; 900 if (sep->se_numchild == sep->se_maxchild) 901 disable(sep); 902 } 903 904 /* 905 * Some child process has exited. See if it's on somebody's list. 906 */ 907 908 void 909 flag_reapchild(signo) 910 int signo __unused; 911 { 912 flag_signal('C'); 913 } 914 915 void 916 reapchild() 917 { 918 int k, status; 919 pid_t pid; 920 struct servtab *sep; 921 922 for (;;) { 923 pid = wait3(&status, WNOHANG, (struct rusage *)0); 924 if (pid <= 0) 925 break; 926 if (debug) 927 warnx("%d reaped, %s %u", pid, 928 WIFEXITED(status) ? "status" : "signal", 929 WIFEXITED(status) ? WEXITSTATUS(status) 930 : WTERMSIG(status)); 931 for (sep = servtab; sep; sep = sep->se_next) { 932 for (k = 0; k < sep->se_numchild; k++) 933 if (sep->se_pids[k] == pid) 934 break; 935 if (k == sep->se_numchild) 936 continue; 937 if (sep->se_numchild == sep->se_maxchild) 938 enable(sep); 939 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 940 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 941 syslog(LOG_WARNING, 942 "%s[%d]: exited, %s %u", 943 sep->se_server, pid, 944 WIFEXITED(status) ? "status" : "signal", 945 WIFEXITED(status) ? WEXITSTATUS(status) 946 : WTERMSIG(status)); 947 break; 948 } 949 reapchild_conn(pid); 950 } 951 } 952 953 void 954 flag_config(signo) 955 int signo __unused; 956 { 957 flag_signal('H'); 958 } 959 960 void 961 config() 962 { 963 struct servtab *sep, *new, **sepp; 964 long omask; 965 #ifdef LOGIN_CAP 966 login_cap_t *lc = NULL; 967 #endif 968 969 970 if (!setconfig()) { 971 syslog(LOG_ERR, "%s: %m", CONFIG); 972 return; 973 } 974 for (sep = servtab; sep; sep = sep->se_next) 975 sep->se_checked = 0; 976 while ((new = getconfigent())) { 977 if (getpwnam(new->se_user) == NULL) { 978 syslog(LOG_ERR, 979 "%s/%s: no such user '%s', service ignored", 980 new->se_service, new->se_proto, new->se_user); 981 continue; 982 } 983 if (new->se_group && getgrnam(new->se_group) == NULL) { 984 syslog(LOG_ERR, 985 "%s/%s: no such group '%s', service ignored", 986 new->se_service, new->se_proto, new->se_group); 987 continue; 988 } 989 #ifdef LOGIN_CAP 990 if ((lc = login_getclass(new->se_class)) == NULL) { 991 /* error syslogged by getclass */ 992 syslog(LOG_ERR, 993 "%s/%s: %s: login class error, service ignored", 994 new->se_service, new->se_proto, new->se_class); 995 continue; 996 } 997 login_close(lc); 998 #endif 999 for (sep = servtab; sep; sep = sep->se_next) 1000 if (strcmp(sep->se_service, new->se_service) == 0 && 1001 strcmp(sep->se_proto, new->se_proto) == 0 && 1002 sep->se_socktype == new->se_socktype && 1003 sep->se_family == new->se_family) 1004 break; 1005 if (sep != 0) { 1006 int i; 1007 1008 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; } 1009 omask = sigblock(SIGBLOCK); 1010 if (sep->se_nomapped != new->se_nomapped) { 1011 sep->se_nomapped = new->se_nomapped; 1012 sep->se_reset = 1; 1013 } 1014 /* copy over outstanding child pids */ 1015 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1016 new->se_numchild = sep->se_numchild; 1017 if (new->se_numchild > new->se_maxchild) 1018 new->se_numchild = new->se_maxchild; 1019 memcpy(new->se_pids, sep->se_pids, 1020 new->se_numchild * sizeof(*new->se_pids)); 1021 } 1022 SWAP(sep->se_pids, new->se_pids); 1023 sep->se_maxchild = new->se_maxchild; 1024 sep->se_numchild = new->se_numchild; 1025 sep->se_maxcpm = new->se_maxcpm; 1026 resize_conn(sep, new->se_maxperip); 1027 sep->se_maxperip = new->se_maxperip; 1028 sep->se_bi = new->se_bi; 1029 /* might need to turn on or off service now */ 1030 if (sep->se_fd >= 0) { 1031 if (sep->se_maxchild > 0 1032 && sep->se_numchild == sep->se_maxchild) { 1033 if (FD_ISSET(sep->se_fd, &allsock)) 1034 disable(sep); 1035 } else { 1036 if (!FD_ISSET(sep->se_fd, &allsock)) 1037 enable(sep); 1038 } 1039 } 1040 sep->se_accept = new->se_accept; 1041 SWAP(sep->se_user, new->se_user); 1042 SWAP(sep->se_group, new->se_group); 1043 #ifdef LOGIN_CAP 1044 SWAP(sep->se_class, new->se_class); 1045 #endif 1046 SWAP(sep->se_server, new->se_server); 1047 SWAP(sep->se_server_name, new->se_server_name); 1048 for (i = 0; i < MAXARGV; i++) 1049 SWAP(sep->se_argv[i], new->se_argv[i]); 1050 #ifdef IPSEC 1051 SWAP(sep->se_policy, new->se_policy); 1052 ipsecsetup(sep); 1053 #endif 1054 sigsetmask(omask); 1055 freeconfig(new); 1056 if (debug) 1057 print_service("REDO", sep); 1058 } else { 1059 sep = enter(new); 1060 if (debug) 1061 print_service("ADD ", sep); 1062 } 1063 sep->se_checked = 1; 1064 if (ISMUX(sep)) { 1065 sep->se_fd = -1; 1066 continue; 1067 } 1068 switch (sep->se_family) { 1069 case AF_INET: 1070 if (no_v4bind != 0) { 1071 sep->se_fd = -1; 1072 continue; 1073 } 1074 break; 1075 #ifdef INET6 1076 case AF_INET6: 1077 if (no_v6bind != 0) { 1078 sep->se_fd = -1; 1079 continue; 1080 } 1081 break; 1082 #endif 1083 } 1084 if (!sep->se_rpc) { 1085 if (sep->se_family != AF_UNIX) { 1086 sp = getservbyname(sep->se_service, sep->se_proto); 1087 if (sp == 0) { 1088 syslog(LOG_ERR, "%s/%s: unknown service", 1089 sep->se_service, sep->se_proto); 1090 sep->se_checked = 0; 1091 continue; 1092 } 1093 } 1094 switch (sep->se_family) { 1095 case AF_INET: 1096 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1097 sep->se_ctrladdr4.sin_port = 1098 sp->s_port; 1099 sep->se_reset = 1; 1100 } 1101 break; 1102 #ifdef INET6 1103 case AF_INET6: 1104 if (sp->s_port != 1105 sep->se_ctrladdr6.sin6_port) { 1106 sep->se_ctrladdr6.sin6_port = 1107 sp->s_port; 1108 sep->se_reset = 1; 1109 } 1110 break; 1111 #endif 1112 } 1113 if (sep->se_reset != 0 && sep->se_fd >= 0) 1114 close_sep(sep); 1115 } else { 1116 rpc = getrpcbyname(sep->se_service); 1117 if (rpc == 0) { 1118 syslog(LOG_ERR, "%s/%s unknown RPC service", 1119 sep->se_service, sep->se_proto); 1120 if (sep->se_fd != -1) 1121 (void) close(sep->se_fd); 1122 sep->se_fd = -1; 1123 continue; 1124 } 1125 if (rpc->r_number != sep->se_rpc_prog) { 1126 if (sep->se_rpc_prog) 1127 unregisterrpc(sep); 1128 sep->se_rpc_prog = rpc->r_number; 1129 if (sep->se_fd != -1) 1130 (void) close(sep->se_fd); 1131 sep->se_fd = -1; 1132 } 1133 } 1134 if (sep->se_fd == -1) 1135 setup(sep); 1136 } 1137 endconfig(); 1138 /* 1139 * Purge anything not looked at above. 1140 */ 1141 omask = sigblock(SIGBLOCK); 1142 sepp = &servtab; 1143 while ((sep = *sepp)) { 1144 if (sep->se_checked) { 1145 sepp = &sep->se_next; 1146 continue; 1147 } 1148 *sepp = sep->se_next; 1149 if (sep->se_fd >= 0) 1150 close_sep(sep); 1151 if (debug) 1152 print_service("FREE", sep); 1153 if (sep->se_rpc && sep->se_rpc_prog > 0) 1154 unregisterrpc(sep); 1155 freeconfig(sep); 1156 free(sep); 1157 } 1158 (void) sigsetmask(omask); 1159 } 1160 1161 void 1162 unregisterrpc(sep) 1163 struct servtab *sep; 1164 { 1165 u_int i; 1166 struct servtab *sepp; 1167 long omask; 1168 1169 omask = sigblock(SIGBLOCK); 1170 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1171 if (sepp == sep) 1172 continue; 1173 if (sep->se_checked == 0 || 1174 !sepp->se_rpc || 1175 sep->se_rpc_prog != sepp->se_rpc_prog) 1176 continue; 1177 return; 1178 } 1179 if (debug) 1180 print_service("UNREG", sep); 1181 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) 1182 pmap_unset(sep->se_rpc_prog, i); 1183 if (sep->se_fd != -1) 1184 (void) close(sep->se_fd); 1185 sep->se_fd = -1; 1186 (void) sigsetmask(omask); 1187 } 1188 1189 void 1190 flag_retry(signo) 1191 int signo __unused; 1192 { 1193 flag_signal('A'); 1194 } 1195 1196 void 1197 retry() 1198 { 1199 struct servtab *sep; 1200 1201 timingout = 0; 1202 for (sep = servtab; sep; sep = sep->se_next) 1203 if (sep->se_fd == -1 && !ISMUX(sep)) 1204 setup(sep); 1205 } 1206 1207 void 1208 setup(sep) 1209 struct servtab *sep; 1210 { 1211 int on = 1; 1212 1213 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1214 if (debug) 1215 warn("socket failed on %s/%s", 1216 sep->se_service, sep->se_proto); 1217 syslog(LOG_ERR, "%s/%s: socket: %m", 1218 sep->se_service, sep->se_proto); 1219 return; 1220 } 1221 /* Set all listening sockets to close-on-exec. */ 1222 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1223 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m", 1224 sep->se_service, sep->se_proto); 1225 close(sep->se_fd); 1226 return; 1227 } 1228 #define turnon(fd, opt) \ 1229 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1230 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1231 turnon(sep->se_fd, SO_DEBUG) < 0) 1232 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1233 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1234 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1235 #ifdef SO_PRIVSTATE 1236 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1237 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1238 #endif 1239 /* tftpd opens a new connection then needs more infos */ 1240 if ((sep->se_family == AF_INET6) && 1241 (strcmp(sep->se_proto, "udp") == 0) && 1242 (sep->se_accept == 0) && 1243 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO, 1244 (char *)&on, sizeof (on)) < 0)) 1245 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1246 if (sep->se_family == AF_INET6) { 1247 int flag = sep->se_nomapped ? 1 : 0; 1248 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1249 (char *)&flag, sizeof (flag)) < 0) 1250 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1251 } 1252 #undef turnon 1253 if (sep->se_type == TTCP_TYPE) 1254 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, 1255 (char *)&on, sizeof (on)) < 0) 1256 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); 1257 #ifdef IPV6_FAITH 1258 if (sep->se_type == FAITH_TYPE) { 1259 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1260 sizeof(on)) < 0) { 1261 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1262 } 1263 } 1264 #endif 1265 #ifdef IPSEC 1266 ipsecsetup(sep); 1267 #endif 1268 if (sep->se_family == AF_UNIX) { 1269 (void) unlink(sep->se_ctrladdr_un.sun_path); 1270 umask(0777); /* Make socket with conservative permissions */ 1271 } 1272 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1273 sep->se_ctrladdr_size) < 0) { 1274 if (debug) 1275 warn("bind failed on %s/%s", 1276 sep->se_service, sep->se_proto); 1277 syslog(LOG_ERR, "%s/%s: bind: %m", 1278 sep->se_service, sep->se_proto); 1279 (void) close(sep->se_fd); 1280 sep->se_fd = -1; 1281 if (!timingout) { 1282 timingout = 1; 1283 alarm(RETRYTIME); 1284 } 1285 if (sep->se_family == AF_UNIX) 1286 umask(mask); 1287 return; 1288 } 1289 if (sep->se_family == AF_UNIX) { 1290 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1291 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1292 syslog(LOG_ERR, "chown socket: %m"); 1293 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1294 syslog(LOG_ERR, "chmod socket: %m"); 1295 umask(mask); 1296 } 1297 if (sep->se_rpc) { 1298 u_int i; 1299 socklen_t len = sep->se_ctrladdr_size; 1300 1301 if (sep->se_family != AF_INET) { 1302 syslog(LOG_ERR, 1303 "%s/%s: unsupported address family for rpc", 1304 sep->se_service, sep->se_proto); 1305 (void) close(sep->se_fd); 1306 sep->se_fd = -1; 1307 return; 1308 } 1309 if (getsockname(sep->se_fd, 1310 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1311 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1312 sep->se_service, sep->se_proto); 1313 (void) close(sep->se_fd); 1314 sep->se_fd = -1; 1315 return; 1316 } 1317 if (debug) 1318 print_service("REG ", sep); 1319 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1320 pmap_unset(sep->se_rpc_prog, i); 1321 pmap_set(sep->se_rpc_prog, i, 1322 (sep->se_socktype == SOCK_DGRAM) 1323 ? IPPROTO_UDP : IPPROTO_TCP, 1324 ntohs(sep->se_ctrladdr4.sin_port)); 1325 } 1326 } 1327 if (sep->se_socktype == SOCK_STREAM) 1328 listen(sep->se_fd, 64); 1329 enable(sep); 1330 if (debug) { 1331 warnx("registered %s on %d", 1332 sep->se_server, sep->se_fd); 1333 } 1334 } 1335 1336 #ifdef IPSEC 1337 void 1338 ipsecsetup(sep) 1339 struct servtab *sep; 1340 { 1341 char *buf; 1342 char *policy_in = NULL; 1343 char *policy_out = NULL; 1344 int level; 1345 int opt; 1346 1347 switch (sep->se_family) { 1348 case AF_INET: 1349 level = IPPROTO_IP; 1350 opt = IP_IPSEC_POLICY; 1351 break; 1352 #ifdef INET6 1353 case AF_INET6: 1354 level = IPPROTO_IPV6; 1355 opt = IPV6_IPSEC_POLICY; 1356 break; 1357 #endif 1358 default: 1359 return; 1360 } 1361 1362 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1363 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1364 policy_in = def_in; 1365 policy_out = def_out; 1366 } else { 1367 if (!strncmp("in", sep->se_policy, 2)) 1368 policy_in = sep->se_policy; 1369 else if (!strncmp("out", sep->se_policy, 3)) 1370 policy_out = sep->se_policy; 1371 else { 1372 syslog(LOG_ERR, "invalid security policy \"%s\"", 1373 sep->se_policy); 1374 return; 1375 } 1376 } 1377 1378 if (policy_in != NULL) { 1379 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1380 if (buf != NULL) { 1381 if (setsockopt(sep->se_fd, level, opt, 1382 buf, ipsec_get_policylen(buf)) < 0 && 1383 debug != 0) 1384 warnx("%s/%s: ipsec initialization failed; %s", 1385 sep->se_service, sep->se_proto, 1386 policy_in); 1387 free(buf); 1388 } else 1389 syslog(LOG_ERR, "invalid security policy \"%s\"", 1390 policy_in); 1391 } 1392 if (policy_out != NULL) { 1393 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1394 if (buf != NULL) { 1395 if (setsockopt(sep->se_fd, level, opt, 1396 buf, ipsec_get_policylen(buf)) < 0 && 1397 debug != 0) 1398 warnx("%s/%s: ipsec initialization failed; %s", 1399 sep->se_service, sep->se_proto, 1400 policy_out); 1401 free(buf); 1402 } else 1403 syslog(LOG_ERR, "invalid security policy \"%s\"", 1404 policy_out); 1405 } 1406 } 1407 #endif 1408 1409 /* 1410 * Finish with a service and its socket. 1411 */ 1412 void 1413 close_sep(sep) 1414 struct servtab *sep; 1415 { 1416 if (sep->se_fd >= 0) { 1417 if (FD_ISSET(sep->se_fd, &allsock)) 1418 disable(sep); 1419 (void) close(sep->se_fd); 1420 sep->se_fd = -1; 1421 } 1422 sep->se_count = 0; 1423 sep->se_numchild = 0; /* forget about any existing children */ 1424 } 1425 1426 int 1427 matchservent(name1, name2, proto) 1428 const char *name1, *name2, *proto; 1429 { 1430 char **alias, *p; 1431 struct servent *se; 1432 1433 if (strcmp(proto, "unix") == 0) { 1434 if ((p = strrchr(name1, '/')) != NULL) 1435 name1 = p + 1; 1436 if ((p = strrchr(name2, '/')) != NULL) 1437 name2 = p + 1; 1438 } 1439 if (strcmp(name1, name2) == 0) 1440 return(1); 1441 if ((se = getservbyname(name1, proto)) != NULL) { 1442 if (strcmp(name2, se->s_name) == 0) 1443 return(1); 1444 for (alias = se->s_aliases; *alias; alias++) 1445 if (strcmp(name2, *alias) == 0) 1446 return(1); 1447 } 1448 return(0); 1449 } 1450 1451 struct servtab * 1452 enter(cp) 1453 struct servtab *cp; 1454 { 1455 struct servtab *sep; 1456 long omask; 1457 1458 sep = (struct servtab *)malloc(sizeof (*sep)); 1459 if (sep == (struct servtab *)0) { 1460 syslog(LOG_ERR, "malloc: %m"); 1461 exit(EX_OSERR); 1462 } 1463 *sep = *cp; 1464 sep->se_fd = -1; 1465 omask = sigblock(SIGBLOCK); 1466 sep->se_next = servtab; 1467 servtab = sep; 1468 sigsetmask(omask); 1469 return (sep); 1470 } 1471 1472 void 1473 enable(sep) 1474 struct servtab *sep; 1475 { 1476 if (debug) 1477 warnx( 1478 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1479 #ifdef SANITY_CHECK 1480 if (sep->se_fd < 0) { 1481 syslog(LOG_ERR, 1482 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 1483 exit(EX_SOFTWARE); 1484 } 1485 if (ISMUX(sep)) { 1486 syslog(LOG_ERR, 1487 "%s: %s: is mux", __FUNCTION__, sep->se_service); 1488 exit(EX_SOFTWARE); 1489 } 1490 if (FD_ISSET(sep->se_fd, &allsock)) { 1491 syslog(LOG_ERR, 1492 "%s: %s: not off", __FUNCTION__, sep->se_service); 1493 exit(EX_SOFTWARE); 1494 } 1495 nsock++; 1496 #endif 1497 FD_SET(sep->se_fd, &allsock); 1498 if (sep->se_fd > maxsock) 1499 maxsock = sep->se_fd; 1500 } 1501 1502 void 1503 disable(sep) 1504 struct servtab *sep; 1505 { 1506 if (debug) 1507 warnx( 1508 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1509 #ifdef SANITY_CHECK 1510 if (sep->se_fd < 0) { 1511 syslog(LOG_ERR, 1512 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 1513 exit(EX_SOFTWARE); 1514 } 1515 if (ISMUX(sep)) { 1516 syslog(LOG_ERR, 1517 "%s: %s: is mux", __FUNCTION__, sep->se_service); 1518 exit(EX_SOFTWARE); 1519 } 1520 if (!FD_ISSET(sep->se_fd, &allsock)) { 1521 syslog(LOG_ERR, 1522 "%s: %s: not on", __FUNCTION__, sep->se_service); 1523 exit(EX_SOFTWARE); 1524 } 1525 if (nsock == 0) { 1526 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); 1527 exit(EX_SOFTWARE); 1528 } 1529 nsock--; 1530 #endif 1531 FD_CLR(sep->se_fd, &allsock); 1532 if (sep->se_fd == maxsock) 1533 maxsock--; 1534 } 1535 1536 FILE *fconfig = NULL; 1537 struct servtab serv; 1538 char line[LINE_MAX]; 1539 1540 int 1541 setconfig() 1542 { 1543 1544 if (fconfig != NULL) { 1545 fseek(fconfig, 0L, SEEK_SET); 1546 return (1); 1547 } 1548 fconfig = fopen(CONFIG, "r"); 1549 return (fconfig != NULL); 1550 } 1551 1552 void 1553 endconfig() 1554 { 1555 if (fconfig) { 1556 (void) fclose(fconfig); 1557 fconfig = NULL; 1558 } 1559 } 1560 1561 struct servtab * 1562 getconfigent() 1563 { 1564 struct servtab *sep = &serv; 1565 int argc; 1566 char *cp, *arg, *s; 1567 char *versp; 1568 static char TCPMUX_TOKEN[] = "tcpmux/"; 1569 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1570 #ifdef IPSEC 1571 char *policy = NULL; 1572 #endif 1573 int v4bind = 0; 1574 #ifdef INET6 1575 int v6bind = 0; 1576 #endif 1577 int i; 1578 1579 more: 1580 while ((cp = nextline(fconfig)) != NULL) { 1581 #ifdef IPSEC 1582 /* lines starting with #@ is not a comment, but the policy */ 1583 if (cp[0] == '#' && cp[1] == '@') { 1584 char *p; 1585 for (p = cp + 2; p && *p && isspace(*p); p++) 1586 ; 1587 if (*p == '\0') { 1588 if (policy) 1589 free(policy); 1590 policy = NULL; 1591 } else if (ipsec_get_policylen(p) >= 0) { 1592 if (policy) 1593 free(policy); 1594 policy = newstr(p); 1595 } else { 1596 syslog(LOG_ERR, 1597 "%s: invalid ipsec policy \"%s\"", 1598 CONFIG, p); 1599 exit(EX_CONFIG); 1600 } 1601 } 1602 #endif 1603 if (*cp == '#' || *cp == '\0') 1604 continue; 1605 break; 1606 } 1607 if (cp == NULL) 1608 return ((struct servtab *)0); 1609 /* 1610 * clear the static buffer, since some fields (se_ctrladdr, 1611 * for example) don't get initialized here. 1612 */ 1613 memset(sep, 0, sizeof *sep); 1614 arg = skip(&cp); 1615 if (cp == NULL) { 1616 /* got an empty line containing just blanks/tabs. */ 1617 goto more; 1618 } 1619 if (arg[0] == ':') { /* :user:group:perm: */ 1620 char *user, *group, *perm; 1621 struct passwd *pw; 1622 struct group *gr; 1623 user = arg+1; 1624 if ((group = strchr(user, ':')) == NULL) { 1625 syslog(LOG_ERR, "no group after user '%s'", user); 1626 goto more; 1627 } 1628 *group++ = '\0'; 1629 if ((perm = strchr(group, ':')) == NULL) { 1630 syslog(LOG_ERR, "no mode after group '%s'", group); 1631 goto more; 1632 } 1633 *perm++ = '\0'; 1634 if ((pw = getpwnam(user)) == NULL) { 1635 syslog(LOG_ERR, "no such user '%s'", user); 1636 goto more; 1637 } 1638 sep->se_sockuid = pw->pw_uid; 1639 if ((gr = getgrnam(group)) == NULL) { 1640 syslog(LOG_ERR, "no such user '%s'", group); 1641 goto more; 1642 } 1643 sep->se_sockgid = gr->gr_gid; 1644 sep->se_sockmode = strtol(perm, &arg, 8); 1645 if (*arg != ':') { 1646 syslog(LOG_ERR, "bad mode '%s'", perm); 1647 goto more; 1648 } 1649 *arg++ = '\0'; 1650 } else { 1651 sep->se_sockuid = euid; 1652 sep->se_sockgid = egid; 1653 sep->se_sockmode = 0200; 1654 } 1655 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1656 char *c = arg + MUX_LEN; 1657 if (*c == '+') { 1658 sep->se_type = MUXPLUS_TYPE; 1659 c++; 1660 } else 1661 sep->se_type = MUX_TYPE; 1662 sep->se_service = newstr(c); 1663 } else { 1664 sep->se_service = newstr(arg); 1665 sep->se_type = NORM_TYPE; 1666 } 1667 arg = sskip(&cp); 1668 if (strcmp(arg, "stream") == 0) 1669 sep->se_socktype = SOCK_STREAM; 1670 else if (strcmp(arg, "dgram") == 0) 1671 sep->se_socktype = SOCK_DGRAM; 1672 else if (strcmp(arg, "rdm") == 0) 1673 sep->se_socktype = SOCK_RDM; 1674 else if (strcmp(arg, "seqpacket") == 0) 1675 sep->se_socktype = SOCK_SEQPACKET; 1676 else if (strcmp(arg, "raw") == 0) 1677 sep->se_socktype = SOCK_RAW; 1678 else 1679 sep->se_socktype = -1; 1680 1681 arg = sskip(&cp); 1682 if (strncmp(arg, "tcp", 3) == 0) { 1683 sep->se_proto = newstr(strsep(&arg, "/")); 1684 if (arg != NULL) { 1685 if (strcmp(arg, "ttcp") == 0) 1686 sep->se_type = TTCP_TYPE; 1687 else if (strcmp(arg, "faith") == 0) 1688 sep->se_type = FAITH_TYPE; 1689 } 1690 } else { 1691 if (sep->se_type == NORM_TYPE && 1692 strncmp(arg, "faith/", 6) == 0) { 1693 arg += 6; 1694 sep->se_type = FAITH_TYPE; 1695 } 1696 sep->se_proto = newstr(arg); 1697 } 1698 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1699 if (no_v4bind != 0) { 1700 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1701 sep->se_service); 1702 freeconfig(sep); 1703 goto more; 1704 } 1705 memmove(sep->se_proto, sep->se_proto + 4, 1706 strlen(sep->se_proto) + 1 - 4); 1707 sep->se_rpc = 1; 1708 sep->se_rpc_prog = sep->se_rpc_lowvers = 1709 sep->se_rpc_lowvers = 0; 1710 memcpy(&sep->se_ctrladdr4, bind_sa4, 1711 sizeof(sep->se_ctrladdr4)); 1712 if ((versp = rindex(sep->se_service, '/'))) { 1713 *versp++ = '\0'; 1714 switch (sscanf(versp, "%u-%u", 1715 &sep->se_rpc_lowvers, 1716 &sep->se_rpc_highvers)) { 1717 case 2: 1718 break; 1719 case 1: 1720 sep->se_rpc_highvers = 1721 sep->se_rpc_lowvers; 1722 break; 1723 default: 1724 syslog(LOG_ERR, 1725 "bad RPC version specifier; %s", 1726 sep->se_service); 1727 freeconfig(sep); 1728 goto more; 1729 } 1730 } 1731 else { 1732 sep->se_rpc_lowvers = 1733 sep->se_rpc_highvers = 1; 1734 } 1735 } 1736 sep->se_nomapped = 0; 1737 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1738 #ifdef INET6 1739 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1740 if (no_v6bind != 0) { 1741 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s", 1742 sep->se_service); 1743 freeconfig(sep); 1744 goto more; 1745 } 1746 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1747 v6bind = 1; 1748 continue; 1749 } 1750 #endif 1751 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1752 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1753 v4bind = 1; 1754 continue; 1755 } 1756 /* illegal version num */ 1757 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1758 freeconfig(sep); 1759 goto more; 1760 } 1761 if (strcmp(sep->se_proto, "unix") == 0) { 1762 sep->se_family = AF_UNIX; 1763 } else 1764 #ifdef INET6 1765 if (v6bind != 0) { 1766 sep->se_family = AF_INET6; 1767 if (v4bind == 0 || no_v4bind != 0) 1768 sep->se_nomapped = 1; 1769 } else 1770 #endif 1771 { /* default to v4 bind if not v6 bind */ 1772 if (no_v4bind != 0) { 1773 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1774 sep->se_service); 1775 freeconfig(sep); 1776 goto more; 1777 } 1778 sep->se_family = AF_INET; 1779 } 1780 /* init ctladdr */ 1781 switch(sep->se_family) { 1782 case AF_INET: 1783 memcpy(&sep->se_ctrladdr4, bind_sa4, 1784 sizeof(sep->se_ctrladdr4)); 1785 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1786 break; 1787 #ifdef INET6 1788 case AF_INET6: 1789 memcpy(&sep->se_ctrladdr6, bind_sa6, 1790 sizeof(sep->se_ctrladdr6)); 1791 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1792 break; 1793 #endif 1794 case AF_UNIX: 1795 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1796 syslog(LOG_ERR, 1797 "domain socket pathname too long for service %s", 1798 sep->se_service); 1799 goto more; 1800 } 1801 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1802 sep->se_ctrladdr_un.sun_family = sep->se_family; 1803 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1804 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1805 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1806 } 1807 arg = sskip(&cp); 1808 if (!strncmp(arg, "wait", 4)) 1809 sep->se_accept = 0; 1810 else if (!strncmp(arg, "nowait", 6)) 1811 sep->se_accept = 1; 1812 else { 1813 syslog(LOG_ERR, 1814 "%s: bad wait/nowait for service %s", 1815 CONFIG, sep->se_service); 1816 goto more; 1817 } 1818 sep->se_maxchild = -1; 1819 sep->se_maxcpm = -1; 1820 sep->se_maxperip = -1; 1821 if ((s = strchr(arg, '/')) != NULL) { 1822 char *eptr; 1823 u_long val; 1824 1825 val = strtoul(s + 1, &eptr, 10); 1826 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1827 syslog(LOG_ERR, 1828 "%s: bad max-child for service %s", 1829 CONFIG, sep->se_service); 1830 goto more; 1831 } 1832 if (debug) 1833 if (!sep->se_accept && val != 1) 1834 warnx("maxchild=%lu for wait service %s" 1835 " not recommended", val, sep->se_service); 1836 sep->se_maxchild = val; 1837 if (*eptr == '/') 1838 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1839 if (*eptr == '/') 1840 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1841 /* 1842 * explicitly do not check for \0 for future expansion / 1843 * backwards compatibility 1844 */ 1845 } 1846 if (ISMUX(sep)) { 1847 /* 1848 * Silently enforce "nowait" mode for TCPMUX services 1849 * since they don't have an assigned port to listen on. 1850 */ 1851 sep->se_accept = 1; 1852 if (strcmp(sep->se_proto, "tcp")) { 1853 syslog(LOG_ERR, 1854 "%s: bad protocol for tcpmux service %s", 1855 CONFIG, sep->se_service); 1856 goto more; 1857 } 1858 if (sep->se_socktype != SOCK_STREAM) { 1859 syslog(LOG_ERR, 1860 "%s: bad socket type for tcpmux service %s", 1861 CONFIG, sep->se_service); 1862 goto more; 1863 } 1864 } 1865 sep->se_user = newstr(sskip(&cp)); 1866 #ifdef LOGIN_CAP 1867 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1868 *s = '\0'; 1869 sep->se_class = newstr(s + 1); 1870 } else 1871 sep->se_class = newstr(RESOURCE_RC); 1872 #endif 1873 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1874 *s = '\0'; 1875 sep->se_group = newstr(s + 1); 1876 } else 1877 sep->se_group = NULL; 1878 sep->se_server = newstr(sskip(&cp)); 1879 if ((sep->se_server_name = rindex(sep->se_server, '/'))) 1880 sep->se_server_name++; 1881 if (strcmp(sep->se_server, "internal") == 0) { 1882 struct biltin *bi; 1883 1884 for (bi = biltins; bi->bi_service; bi++) 1885 if (bi->bi_socktype == sep->se_socktype && 1886 matchservent(bi->bi_service, sep->se_service, 1887 sep->se_proto)) 1888 break; 1889 if (bi->bi_service == 0) { 1890 syslog(LOG_ERR, "internal service %s unknown", 1891 sep->se_service); 1892 goto more; 1893 } 1894 sep->se_accept = 1; /* force accept mode for built-ins */ 1895 sep->se_bi = bi; 1896 } else 1897 sep->se_bi = NULL; 1898 if (sep->se_maxperip < 0) 1899 sep->se_maxperip = maxperip; 1900 if (sep->se_maxcpm < 0) 1901 sep->se_maxcpm = maxcpm; 1902 if (sep->se_maxchild < 0) { /* apply default max-children */ 1903 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1904 sep->se_maxchild = sep->se_bi->bi_maxchild; 1905 else if (sep->se_accept) 1906 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1907 else 1908 sep->se_maxchild = 1; 1909 } 1910 if (sep->se_maxchild > 0) { 1911 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1912 if (sep->se_pids == NULL) { 1913 syslog(LOG_ERR, "malloc: %m"); 1914 exit(EX_OSERR); 1915 } 1916 } 1917 argc = 0; 1918 for (arg = skip(&cp); cp; arg = skip(&cp)) 1919 if (argc < MAXARGV) { 1920 sep->se_argv[argc++] = newstr(arg); 1921 } else { 1922 syslog(LOG_ERR, 1923 "%s: too many arguments for service %s", 1924 CONFIG, sep->se_service); 1925 goto more; 1926 } 1927 while (argc <= MAXARGV) 1928 sep->se_argv[argc++] = NULL; 1929 for (i = 0; i < PERIPSIZE; ++i) 1930 LIST_INIT(&sep->se_conn[i]); 1931 #ifdef IPSEC 1932 sep->se_policy = policy ? newstr(policy) : NULL; 1933 #endif 1934 return (sep); 1935 } 1936 1937 void 1938 freeconfig(cp) 1939 struct servtab *cp; 1940 { 1941 int i; 1942 1943 if (cp->se_service) 1944 free(cp->se_service); 1945 if (cp->se_proto) 1946 free(cp->se_proto); 1947 if (cp->se_user) 1948 free(cp->se_user); 1949 if (cp->se_group) 1950 free(cp->se_group); 1951 #ifdef LOGIN_CAP 1952 if (cp->se_class) 1953 free(cp->se_class); 1954 #endif 1955 if (cp->se_server) 1956 free(cp->se_server); 1957 if (cp->se_pids) 1958 free(cp->se_pids); 1959 for (i = 0; i < MAXARGV; i++) 1960 if (cp->se_argv[i]) 1961 free(cp->se_argv[i]); 1962 free_connlist(cp); 1963 #ifdef IPSEC 1964 if (cp->se_policy) 1965 free(cp->se_policy); 1966 #endif 1967 } 1968 1969 1970 /* 1971 * Safe skip - if skip returns null, log a syntax error in the 1972 * configuration file and exit. 1973 */ 1974 char * 1975 sskip(cpp) 1976 char **cpp; 1977 { 1978 char *cp; 1979 1980 cp = skip(cpp); 1981 if (cp == NULL) { 1982 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1983 exit(EX_DATAERR); 1984 } 1985 return (cp); 1986 } 1987 1988 char * 1989 skip(cpp) 1990 char **cpp; 1991 { 1992 char *cp = *cpp; 1993 char *start; 1994 char quote = '\0'; 1995 1996 again: 1997 while (*cp == ' ' || *cp == '\t') 1998 cp++; 1999 if (*cp == '\0') { 2000 int c; 2001 2002 c = getc(fconfig); 2003 (void) ungetc(c, fconfig); 2004 if (c == ' ' || c == '\t') 2005 if ((cp = nextline(fconfig))) 2006 goto again; 2007 *cpp = (char *)0; 2008 return ((char *)0); 2009 } 2010 if (*cp == '"' || *cp == '\'') 2011 quote = *cp++; 2012 start = cp; 2013 if (quote) 2014 while (*cp && *cp != quote) 2015 cp++; 2016 else 2017 while (*cp && *cp != ' ' && *cp != '\t') 2018 cp++; 2019 if (*cp != '\0') 2020 *cp++ = '\0'; 2021 *cpp = cp; 2022 return (start); 2023 } 2024 2025 char * 2026 nextline(fd) 2027 FILE *fd; 2028 { 2029 char *cp; 2030 2031 if (fgets(line, sizeof (line), fd) == NULL) 2032 return ((char *)0); 2033 cp = strchr(line, '\n'); 2034 if (cp) 2035 *cp = '\0'; 2036 return (line); 2037 } 2038 2039 char * 2040 newstr(cp) 2041 const char *cp; 2042 { 2043 char *cr; 2044 2045 if ((cr = strdup(cp != NULL ? cp : ""))) 2046 return (cr); 2047 syslog(LOG_ERR, "strdup: %m"); 2048 exit(EX_OSERR); 2049 } 2050 2051 void 2052 inetd_setproctitle(a, s) 2053 const char *a; 2054 int s; 2055 { 2056 socklen_t size; 2057 struct sockaddr_storage ss; 2058 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2059 2060 size = sizeof(ss); 2061 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2062 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2063 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); 2064 (void) sprintf(buf, "%s [%s]", a, pbuf); 2065 } else 2066 (void) sprintf(buf, "%s", a); 2067 setproctitle("%s", buf); 2068 } 2069 2070 int 2071 check_loop(sa, sep) 2072 const struct sockaddr *sa; 2073 const struct servtab *sep; 2074 { 2075 struct servtab *se2; 2076 char pname[INET6_ADDRSTRLEN]; 2077 2078 for (se2 = servtab; se2; se2 = se2->se_next) { 2079 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2080 continue; 2081 2082 switch (se2->se_family) { 2083 case AF_INET: 2084 if (((const struct sockaddr_in *)sa)->sin_port == 2085 se2->se_ctrladdr4.sin_port) 2086 goto isloop; 2087 continue; 2088 #ifdef INET6 2089 case AF_INET6: 2090 if (((const struct sockaddr_in *)sa)->sin_port == 2091 se2->se_ctrladdr4.sin_port) 2092 goto isloop; 2093 continue; 2094 #endif 2095 default: 2096 continue; 2097 } 2098 isloop: 2099 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2100 NI_NUMERICHOST|NI_WITHSCOPEID); 2101 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2102 sep->se_service, sep->se_proto, 2103 se2->se_service, se2->se_proto, 2104 pname); 2105 return 1; 2106 } 2107 return 0; 2108 } 2109 2110 /* 2111 * print_service: 2112 * Dump relevant information to stderr 2113 */ 2114 void 2115 print_service(action, sep) 2116 const char *action; 2117 const struct servtab *sep; 2118 { 2119 fprintf(stderr, 2120 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2121 #ifdef LOGIN_CAP 2122 "class=%s" 2123 #endif 2124 " builtin=%p server=%s" 2125 #ifdef IPSEC 2126 " policy=\"%s\"" 2127 #endif 2128 "\n", 2129 action, sep->se_service, sep->se_proto, 2130 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2131 #ifdef LOGIN_CAP 2132 sep->se_class, 2133 #endif 2134 (void *) sep->se_bi, sep->se_server 2135 #ifdef IPSEC 2136 , (sep->se_policy ? sep->se_policy : "") 2137 #endif 2138 ); 2139 } 2140 2141 #define CPMHSIZE 256 2142 #define CPMHMASK (CPMHSIZE-1) 2143 #define CHTGRAN 10 2144 #define CHTSIZE 6 2145 2146 typedef struct CTime { 2147 unsigned long ct_Ticks; 2148 int ct_Count; 2149 } CTime; 2150 2151 typedef struct CHash { 2152 union { 2153 struct in_addr c4_Addr; 2154 struct in6_addr c6_Addr; 2155 } cu_Addr; 2156 #define ch_Addr4 cu_Addr.c4_Addr 2157 #define ch_Addr6 cu_Addr.c6_Addr 2158 int ch_Family; 2159 time_t ch_LTime; 2160 char *ch_Service; 2161 CTime ch_Times[CHTSIZE]; 2162 } CHash; 2163 2164 CHash CHashAry[CPMHSIZE]; 2165 2166 int 2167 cpmip(sep, ctrl) 2168 const struct servtab *sep; 2169 int ctrl; 2170 { 2171 struct sockaddr_storage rss; 2172 socklen_t rssLen = sizeof(rss); 2173 int r = 0; 2174 2175 /* 2176 * If getpeername() fails, just let it through (if logging is 2177 * enabled the condition is caught elsewhere) 2178 */ 2179 2180 if (sep->se_maxcpm > 0 && 2181 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2182 time_t t = time(NULL); 2183 int hv = 0xABC3D20F; 2184 int i; 2185 int cnt = 0; 2186 CHash *chBest = NULL; 2187 unsigned int ticks = t / CHTGRAN; 2188 struct sockaddr_in *sin4; 2189 #ifdef INET6 2190 struct sockaddr_in6 *sin6; 2191 #endif 2192 2193 sin4 = (struct sockaddr_in *)&rss; 2194 #ifdef INET6 2195 sin6 = (struct sockaddr_in6 *)&rss; 2196 #endif 2197 { 2198 char *p; 2199 int addrlen; 2200 2201 switch (rss.ss_family) { 2202 case AF_INET: 2203 p = (char *)&sin4->sin_addr; 2204 addrlen = sizeof(struct in_addr); 2205 break; 2206 #ifdef INET6 2207 case AF_INET6: 2208 p = (char *)&sin6->sin6_addr; 2209 addrlen = sizeof(struct in6_addr); 2210 break; 2211 #endif 2212 default: 2213 /* should not happen */ 2214 return -1; 2215 } 2216 2217 for (i = 0; i < addrlen; ++i, ++p) { 2218 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2219 } 2220 hv = (hv ^ (hv >> 16)); 2221 } 2222 for (i = 0; i < 5; ++i) { 2223 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2224 2225 if (rss.ss_family == AF_INET && 2226 ch->ch_Family == AF_INET && 2227 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2228 ch->ch_Service && strcmp(sep->se_service, 2229 ch->ch_Service) == 0) { 2230 chBest = ch; 2231 break; 2232 } 2233 #ifdef INET6 2234 if (rss.ss_family == AF_INET6 && 2235 ch->ch_Family == AF_INET6 && 2236 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2237 &ch->ch_Addr6) != 0 && 2238 ch->ch_Service && strcmp(sep->se_service, 2239 ch->ch_Service) == 0) { 2240 chBest = ch; 2241 break; 2242 } 2243 #endif 2244 if (chBest == NULL || ch->ch_LTime == 0 || 2245 ch->ch_LTime < chBest->ch_LTime) { 2246 chBest = ch; 2247 } 2248 } 2249 if ((rss.ss_family == AF_INET && 2250 (chBest->ch_Family != AF_INET || 2251 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2252 chBest->ch_Service == NULL || 2253 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2254 chBest->ch_Family = sin4->sin_family; 2255 chBest->ch_Addr4 = sin4->sin_addr; 2256 if (chBest->ch_Service) 2257 free(chBest->ch_Service); 2258 chBest->ch_Service = strdup(sep->se_service); 2259 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2260 } 2261 #ifdef INET6 2262 if ((rss.ss_family == AF_INET6 && 2263 (chBest->ch_Family != AF_INET6 || 2264 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2265 &chBest->ch_Addr6) == 0)) || 2266 chBest->ch_Service == NULL || 2267 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2268 chBest->ch_Family = sin6->sin6_family; 2269 chBest->ch_Addr6 = sin6->sin6_addr; 2270 if (chBest->ch_Service) 2271 free(chBest->ch_Service); 2272 chBest->ch_Service = strdup(sep->se_service); 2273 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2274 } 2275 #endif 2276 chBest->ch_LTime = t; 2277 { 2278 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2279 if (ct->ct_Ticks != ticks) { 2280 ct->ct_Ticks = ticks; 2281 ct->ct_Count = 0; 2282 } 2283 ++ct->ct_Count; 2284 } 2285 for (i = 0; i < CHTSIZE; ++i) { 2286 CTime *ct = &chBest->ch_Times[i]; 2287 if (ct->ct_Ticks <= ticks && 2288 ct->ct_Ticks >= ticks - CHTSIZE) { 2289 cnt += ct->ct_Count; 2290 } 2291 } 2292 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) { 2293 char pname[INET6_ADDRSTRLEN]; 2294 2295 getnameinfo((struct sockaddr *)&rss, 2296 ((struct sockaddr *)&rss)->sa_len, 2297 pname, sizeof(pname), NULL, 0, 2298 NI_NUMERICHOST|NI_WITHSCOPEID); 2299 r = -1; 2300 syslog(LOG_ERR, 2301 "%s from %s exceeded counts/min (limit %d/min)", 2302 sep->se_service, pname, 2303 sep->se_maxcpm); 2304 } 2305 } 2306 return(r); 2307 } 2308 2309 static struct conninfo * 2310 search_conn(struct servtab *sep, int ctrl) 2311 { 2312 struct sockaddr_storage ss; 2313 socklen_t sslen = sizeof(ss); 2314 struct conninfo *conn; 2315 int hv; 2316 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2317 2318 if (sep->se_maxperip <= 0) 2319 return NULL; 2320 2321 /* 2322 * If getpeername() fails, just let it through (if logging is 2323 * enabled the condition is caught elsewhere) 2324 */ 2325 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2326 return NULL; 2327 2328 switch (ss.ss_family) { 2329 case AF_INET: 2330 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2331 sizeof(struct in_addr)); 2332 break; 2333 #ifdef INET6 2334 case AF_INET6: 2335 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2336 sizeof(struct in6_addr)); 2337 break; 2338 #endif 2339 default: 2340 /* 2341 * Since we only support AF_INET and AF_INET6, just 2342 * let other than AF_INET and AF_INET6 through. 2343 */ 2344 return NULL; 2345 } 2346 2347 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2348 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 2349 return NULL; 2350 2351 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2352 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2353 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2354 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 && 2355 strcmp(pname, pname2) == 0) 2356 break; 2357 } 2358 2359 if (conn == NULL) { 2360 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2361 syslog(LOG_ERR, "malloc: %m"); 2362 exit(EX_OSERR); 2363 } 2364 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2365 if (conn->co_proc == NULL) { 2366 syslog(LOG_ERR, "malloc: %m"); 2367 exit(EX_OSERR); 2368 } 2369 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2370 conn->co_numchild = 0; 2371 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2372 } 2373 2374 /* 2375 * Since a child process is not invoked yet, we cannot 2376 * determine a pid of a child. So, co_proc and co_numchild 2377 * should be filled leter. 2378 */ 2379 2380 return conn; 2381 } 2382 2383 static int 2384 room_conn(struct servtab *sep, struct conninfo *conn) 2385 { 2386 char pname[NI_MAXHOST]; 2387 2388 if (conn->co_numchild >= sep->se_maxperip) { 2389 getnameinfo((struct sockaddr *)&conn->co_addr, 2390 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2391 NI_NUMERICHOST | NI_WITHSCOPEID); 2392 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2393 sep->se_service, pname, sep->se_maxperip); 2394 return 0; 2395 } 2396 return 1; 2397 } 2398 2399 static void 2400 addchild_conn(struct conninfo *conn, pid_t pid) 2401 { 2402 struct procinfo *proc; 2403 2404 if (conn == NULL) 2405 return; 2406 2407 if ((proc = search_proc(pid, 1)) != NULL) { 2408 if (proc->pr_conn != NULL) { 2409 syslog(LOG_ERR, 2410 "addchild_conn: child already on process list"); 2411 exit(EX_OSERR); 2412 } 2413 proc->pr_conn = conn; 2414 } 2415 2416 conn->co_proc[conn->co_numchild++] = proc; 2417 } 2418 2419 static void 2420 reapchild_conn(pid_t pid) 2421 { 2422 struct procinfo *proc; 2423 struct conninfo *conn; 2424 int i; 2425 2426 if ((proc = search_proc(pid, 0)) == NULL) 2427 return; 2428 if ((conn = proc->pr_conn) == NULL) 2429 return; 2430 for (i = 0; i < conn->co_numchild; ++i) 2431 if (conn->co_proc[i] == proc) { 2432 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2433 break; 2434 } 2435 free_proc(proc); 2436 free_conn(conn); 2437 } 2438 2439 static void 2440 resize_conn(struct servtab *sep, int maxpip) 2441 { 2442 struct conninfo *conn; 2443 int i, j; 2444 2445 if (sep->se_maxperip <= 0) 2446 return; 2447 if (maxpip <= 0) { 2448 free_connlist(sep); 2449 return; 2450 } 2451 for (i = 0; i < PERIPSIZE; ++i) { 2452 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2453 for (j = maxpip; j < conn->co_numchild; ++j) 2454 free_proc(conn->co_proc[j]); 2455 conn->co_proc = realloc(conn->co_proc, 2456 maxpip * sizeof(*conn->co_proc)); 2457 if (conn->co_proc == NULL) { 2458 syslog(LOG_ERR, "realloc: %m"); 2459 exit(EX_OSERR); 2460 } 2461 if (conn->co_numchild > maxpip) 2462 conn->co_numchild = maxpip; 2463 } 2464 } 2465 } 2466 2467 static void 2468 free_connlist(struct servtab *sep) 2469 { 2470 struct conninfo *conn; 2471 int i, j; 2472 2473 for (i = 0; i < PERIPSIZE; ++i) { 2474 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2475 for (j = 0; j < conn->co_numchild; ++j) 2476 free_proc(conn->co_proc[j]); 2477 conn->co_numchild = 0; 2478 free_conn(conn); 2479 } 2480 } 2481 } 2482 2483 static void 2484 free_conn(struct conninfo *conn) 2485 { 2486 if (conn == NULL) 2487 return; 2488 if (conn->co_numchild <= 0) { 2489 LIST_REMOVE(conn, co_link); 2490 free(conn->co_proc); 2491 free(conn); 2492 } 2493 } 2494 2495 static struct procinfo * 2496 search_proc(pid_t pid, int add) 2497 { 2498 struct procinfo *proc; 2499 int hv; 2500 2501 hv = hashval((char *)&pid, sizeof(pid)); 2502 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2503 if (proc->pr_pid == pid) 2504 break; 2505 } 2506 if (proc == NULL && add) { 2507 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2508 syslog(LOG_ERR, "malloc: %m"); 2509 exit(EX_OSERR); 2510 } 2511 proc->pr_pid = pid; 2512 proc->pr_conn = NULL; 2513 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2514 } 2515 return proc; 2516 } 2517 2518 static void 2519 free_proc(struct procinfo *proc) 2520 { 2521 if (proc == NULL) 2522 return; 2523 LIST_REMOVE(proc, pr_link); 2524 free(proc); 2525 } 2526 2527 static int 2528 hashval(char *p, int len) 2529 { 2530 int i, hv = 0xABC3D20F; 2531 2532 for (i = 0; i < len; ++i, ++p) 2533 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2534 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2535 return hv; 2536 } 2537