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