1 /* 2 * Copyright (c) 1983, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)from: inetd.c 8.4 (Berkeley) 4/13/94 35 * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $ 36 */ 37 38 /* 39 * Inetd - Internet super-server 40 * 41 * This program invokes all internet services as needed. Connection-oriented 42 * services are invoked each time a connection is made, by creating a process. 43 * This process is passed the connection as file descriptor 0 and is expected 44 * to do a getpeername to find out the source host and port. 45 * 46 * Datagram oriented services are invoked when a datagram 47 * arrives; a process is created and passed a pending message 48 * on file descriptor 0. Datagram servers may either connect 49 * to their peer, freeing up the original socket for inetd 50 * to receive further messages on, or ``take over the socket'', 51 * processing all arriving datagrams and, eventually, timing 52 * out. The first type of server is said to be ``multi-threaded''; 53 * the second type of server ``single-threaded''. 54 * 55 * Inetd uses a configuration file which is read at startup 56 * and, possibly, at some later time in response to a hangup signal. 57 * The configuration file is ``free format'' with fields given in the 58 * order shown below. Continuation lines for an entry must begin with 59 * a space or tab. All fields must be present in each entry. 60 * 61 * service name must be in /etc/services 62 * or name a tcpmux service 63 * or specify a unix domain socket 64 * socket type stream/dgram/raw/rdm/seqpacket 65 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix 66 * wait/nowait single-threaded/multi-threaded 67 * user user to run daemon as 68 * server program full path name 69 * server program arguments maximum of MAXARGS (20) 70 * 71 * TCP services without official port numbers are handled with the 72 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 73 * requests. When a connection is made from a foreign host, the service 74 * requested is passed to tcpmux, which looks it up in the servtab list 75 * and returns the proper entry for the service. Tcpmux returns a 76 * negative reply if the service doesn't exist, otherwise the invoked 77 * server is expected to return the positive reply if the service type in 78 * inetd.conf file has the prefix "tcpmux/". If the service type has the 79 * prefix "tcpmux/+", tcpmux will return the positive reply for the 80 * process; this is for compatibility with older server code, and also 81 * allows you to invoke programs that use stdin/stdout without putting any 82 * special server code in them. Services that use tcpmux are "nowait" 83 * because they do not have a well-known port and hence cannot listen 84 * for new requests. 85 * 86 * For RPC services 87 * service name/version must be in /etc/rpc 88 * socket type stream/dgram/raw/rdm/seqpacket 89 * protocol rpc/tcp, rpc/udp 90 * wait/nowait single-threaded/multi-threaded 91 * user user to run daemon as 92 * server program full path name 93 * server program arguments maximum of MAXARGS 94 * 95 * Comment lines are indicated by a `#' in column 1. 96 * 97 * #ifdef IPSEC 98 * Comment lines that start with "#@" denote IPsec policy string, as described 99 * in ipsec_set_policy(3). This will affect all the following items in 100 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 101 * there's no IPsec policy. 102 * #endif 103 */ 104 #include <sys/param.h> 105 #include <sys/ioctl.h> 106 #include <sys/wait.h> 107 #include <sys/time.h> 108 #include <sys/resource.h> 109 #include <sys/stat.h> 110 #include <sys/un.h> 111 112 #include <netinet/in.h> 113 #include <netinet/tcp.h> 114 #include <arpa/inet.h> 115 #include <rpc/rpc.h> 116 #include <rpc/pmap_clnt.h> 117 118 #include <errno.h> 119 #include <err.h> 120 #include <fcntl.h> 121 #include <grp.h> 122 #include <limits.h> 123 #include <netdb.h> 124 #include <pwd.h> 125 #include <signal.h> 126 #include <stdio.h> 127 #include <stdlib.h> 128 #include <string.h> 129 #include <syslog.h> 130 #include <tcpd.h> 131 #include <unistd.h> 132 #include <libutil.h> 133 #include <sysexits.h> 134 #include <ctype.h> 135 136 #include "inetd.h" 137 #include "pathnames.h" 138 139 #ifdef IPSEC 140 #include <netinet6/ipsec.h> 141 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 142 #undef IPSEC 143 #endif 144 #endif 145 146 /* wrapper for KAME-special getnameinfo() */ 147 #ifndef NI_WITHSCOPEID 148 #define NI_WITHSCOPEID 0 149 #endif 150 151 #ifndef LIBWRAP_ALLOW_FACILITY 152 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 153 #endif 154 #ifndef LIBWRAP_ALLOW_SEVERITY 155 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 156 #endif 157 #ifndef LIBWRAP_DENY_FACILITY 158 # define LIBWRAP_DENY_FACILITY LOG_AUTH 159 #endif 160 #ifndef LIBWRAP_DENY_SEVERITY 161 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 162 #endif 163 164 #define ISWRAP(sep) \ 165 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 166 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 167 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 168 || (sep)->se_socktype == SOCK_DGRAM)) 169 170 #ifdef LOGIN_CAP 171 #include <login_cap.h> 172 173 /* see init.c */ 174 #define RESOURCE_RC "daemon" 175 176 #endif 177 178 #ifndef MAXCHILD 179 #define MAXCHILD -1 /* maximum number of this service 180 < 0 = no limit */ 181 #endif 182 183 #ifndef MAXCPM 184 #define MAXCPM -1 /* rate limit invocations from a 185 single remote address, 186 < 0 = no limit */ 187 #endif 188 189 #ifndef MAXPERIP 190 #define MAXPERIP -1 /* maximum number of this service 191 from a single remote address, 192 < 0 = no limit */ 193 #endif 194 195 #ifndef TOOMANY 196 #define TOOMANY 256 /* don't start more than TOOMANY */ 197 #endif 198 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 199 #define RETRYTIME (60*10) /* retry after bind or server fail */ 200 #define MAX_MAXCHLD 32767 /* max allowable max children */ 201 202 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 203 204 void close_sep(struct servtab *); 205 void flag_signal(int); 206 void flag_config(int); 207 void config(void); 208 int cpmip(const struct servtab *, int); 209 void endconfig(void); 210 struct servtab *enter(struct servtab *); 211 void freeconfig(struct servtab *); 212 struct servtab *getconfigent(void); 213 int matchservent(const char *, const char *, const char *); 214 char *nextline(FILE *); 215 void addchild(struct servtab *, int); 216 void flag_reapchild(int); 217 void reapchild(void); 218 void enable(struct servtab *); 219 void disable(struct servtab *); 220 void flag_retry(int); 221 void retry(void); 222 int setconfig(void); 223 void setup(struct servtab *); 224 #ifdef IPSEC 225 void ipsecsetup(struct servtab *); 226 #endif 227 void unregisterrpc(struct servtab *sep); 228 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 229 static int room_conn(struct servtab *sep, struct conninfo *conn); 230 static void addchild_conn(struct conninfo *conn, pid_t pid); 231 static void reapchild_conn(pid_t pid); 232 static void free_conn(struct conninfo *conn); 233 static void resize_conn(struct servtab *sep, int maxperip); 234 static void free_connlist(struct servtab *sep); 235 static void free_proc(struct procinfo *); 236 static struct procinfo *search_proc(pid_t pid, int add); 237 static int hashval(char *p, int len); 238 239 int allow_severity; 240 int deny_severity; 241 int wrap_ex = 0; 242 int wrap_bi = 0; 243 int debug = 0; 244 int dolog = 0; 245 int maxsock; /* highest-numbered descriptor */ 246 fd_set allsock; 247 int options; 248 int timingout; 249 int toomany = TOOMANY; 250 int maxchild = MAXCHILD; 251 int maxcpm = MAXCPM; 252 int maxperip = MAXPERIP; 253 struct servent *sp; 254 struct rpcent *rpc; 255 char *hostname = NULL; 256 struct sockaddr_in *bind_sa4; 257 int no_v4bind = 1; 258 #ifdef INET6 259 struct sockaddr_in6 *bind_sa6; 260 int no_v6bind = 1; 261 #endif 262 int signalpipe[2]; 263 #ifdef SANITY_CHECK 264 int nsock; 265 #endif 266 uid_t euid; 267 gid_t egid; 268 mode_t mask; 269 270 struct servtab *servtab; 271 272 extern struct biltin biltins[]; 273 274 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 275 const char *CONFIG = _PATH_INETDCONF; 276 const char *pid_file = _PATH_INETDPID; 277 278 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 279 280 int 281 getvalue(const char *arg, int *value, const char *whine) 282 { 283 int tmp; 284 char *p; 285 286 tmp = strtol(arg, &p, 0); 287 if (tmp < 0 || *p) { 288 syslog(LOG_ERR, whine, arg); 289 return 1; /* failure */ 290 } 291 *value = tmp; 292 return 0; /* success */ 293 } 294 295 static sa_family_t 296 whichaf(struct request_info *req) 297 { 298 struct sockaddr *sa; 299 300 sa = (struct sockaddr *)req->client->sin; 301 if (sa == NULL) 302 return AF_UNSPEC; 303 if (sa->sa_family == AF_INET6 && 304 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr)) 305 return AF_INET; 306 return sa->sa_family; 307 } 308 309 int 310 main(int argc, char **argv) 311 { 312 struct servtab *sep; 313 struct passwd *pwd; 314 struct group *grp; 315 struct sigaction sa, saalrm, sachld, sahup, sapipe; 316 int ch, dofork; 317 pid_t pid; 318 char buf[50]; 319 #ifdef LOGIN_CAP 320 login_cap_t *lc = NULL; 321 #endif 322 struct request_info req; 323 int denied; 324 char *service = NULL; 325 union { 326 struct sockaddr peer_un; 327 struct sockaddr_in peer_un4; 328 struct sockaddr_in6 peer_un6; 329 struct sockaddr_storage peer_max; 330 } p_un; 331 #define peer p_un.peer_un 332 #define peer4 p_un.peer_un4 333 #define peer6 p_un.peer_un6 334 #define peermax p_un.peer_max 335 int i; 336 struct addrinfo hints, *res; 337 const char *servname; 338 int error; 339 struct conninfo *conn; 340 341 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 342 343 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 344 switch(ch) { 345 case 'd': 346 debug = 1; 347 options |= SO_DEBUG; 348 break; 349 case 'l': 350 dolog = 1; 351 break; 352 case 'R': 353 getvalue(optarg, &toomany, 354 "-R %s: bad value for service invocation rate"); 355 break; 356 case 'c': 357 getvalue(optarg, &maxchild, 358 "-c %s: bad value for maximum children"); 359 break; 360 case 'C': 361 getvalue(optarg, &maxcpm, 362 "-C %s: bad value for maximum children/minute"); 363 break; 364 case 'a': 365 hostname = optarg; 366 break; 367 case 'p': 368 pid_file = optarg; 369 break; 370 case 's': 371 getvalue(optarg, &maxperip, 372 "-s %s: bad value for maximum children per source address"); 373 break; 374 case 'w': 375 wrap_ex++; 376 break; 377 case 'W': 378 wrap_bi++; 379 break; 380 case '?': 381 default: 382 syslog(LOG_ERR, 383 "usage: inetd [-dlwW] [-a address] [-R rate]" 384 " [-c maximum] [-C rate]" 385 " [-p pidfile] [conf-file]"); 386 exit(EX_USAGE); 387 } 388 /* 389 * Initialize Bind Addrs. 390 * When hostname is NULL, wild card bind addrs are obtained from 391 * getaddrinfo(). But getaddrinfo() requires at least one of 392 * hostname or servname is non NULL. 393 * So when hostname is NULL, set dummy value to servname. 394 */ 395 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL; 396 397 bzero(&hints, sizeof(struct addrinfo)); 398 hints.ai_flags = AI_PASSIVE; 399 hints.ai_family = AF_UNSPEC; 400 error = getaddrinfo(hostname, servname, &hints, &res); 401 if (error != 0) { 402 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 403 if (error == EAI_SYSTEM) 404 syslog(LOG_ERR, "%s", strerror(errno)); 405 exit(EX_USAGE); 406 } 407 do { 408 if (res->ai_addr == NULL) { 409 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 410 exit(EX_USAGE); 411 } 412 switch (res->ai_addr->sa_family) { 413 case AF_INET: 414 if (no_v4bind == 0) 415 continue; 416 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 417 /* init port num in case servname is dummy */ 418 bind_sa4->sin_port = 0; 419 no_v4bind = 0; 420 continue; 421 #ifdef INET6 422 case AF_INET6: 423 if (no_v6bind == 0) 424 continue; 425 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 426 /* init port num in case servname is dummy */ 427 bind_sa6->sin6_port = 0; 428 no_v6bind = 0; 429 continue; 430 #endif 431 } 432 if (no_v4bind == 0 433 #ifdef INET6 434 && no_v6bind == 0 435 #endif 436 ) 437 break; 438 } while ((res = res->ai_next) != NULL); 439 if (no_v4bind != 0 440 #ifdef INET6 441 && no_v6bind != 0 442 #endif 443 ) { 444 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 445 exit(EX_USAGE); 446 } 447 448 euid = geteuid(); 449 egid = getegid(); 450 umask(mask = umask(0777)); 451 452 argc -= optind; 453 argv += optind; 454 455 if (argc > 0) 456 CONFIG = argv[0]; 457 if (debug == 0) { 458 FILE *fp; 459 if (daemon(0, 0) < 0) { 460 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 461 } 462 /* From now on we don't want syslog messages going to stderr. */ 463 closelog(); 464 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 465 /* 466 * In case somebody has started inetd manually, we need to 467 * clear the logname, so that old servers run as root do not 468 * get the user's logname.. 469 */ 470 if (setlogin("") < 0) { 471 syslog(LOG_WARNING, "cannot clear logname: %m"); 472 /* no big deal if it fails.. */ 473 } 474 pid = getpid(); 475 fp = fopen(pid_file, "w"); 476 if (fp) { 477 fprintf(fp, "%ld\n", (long)pid); 478 fclose(fp); 479 } else { 480 syslog(LOG_WARNING, "%s: %m", pid_file); 481 } 482 } 483 for (i = 0; i < PERIPSIZE; ++i) 484 LIST_INIT(&proctable[i]); 485 sa.sa_flags = 0; 486 sigemptyset(&sa.sa_mask); 487 sigaddset(&sa.sa_mask, SIGALRM); 488 sigaddset(&sa.sa_mask, SIGCHLD); 489 sigaddset(&sa.sa_mask, SIGHUP); 490 sa.sa_handler = flag_retry; 491 sigaction(SIGALRM, &sa, &saalrm); 492 config(); 493 sa.sa_handler = flag_config; 494 sigaction(SIGHUP, &sa, &sahup); 495 sa.sa_handler = flag_reapchild; 496 sigaction(SIGCHLD, &sa, &sachld); 497 sa.sa_handler = SIG_IGN; 498 sigaction(SIGPIPE, &sa, &sapipe); 499 500 { 501 /* space for daemons to overwrite environment for ps */ 502 #define DUMMYSIZE 100 503 char dummy[DUMMYSIZE]; 504 505 memset(dummy, 'x', DUMMYSIZE - 1); 506 dummy[DUMMYSIZE - 1] = '\0'; 507 if (setenv("inetd_dummy", dummy, 1) == -1) 508 syslog(LOG_WARNING, "setenv: cannot set inetd_dummy=%s: %m", dummy); 509 510 } 511 512 if (pipe(signalpipe) != 0) { 513 syslog(LOG_ERR, "pipe: %m"); 514 exit(EX_OSERR); 515 } 516 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 || 517 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) { 518 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m"); 519 exit(EX_OSERR); 520 } 521 FD_SET(signalpipe[0], &allsock); 522 #ifdef SANITY_CHECK 523 nsock++; 524 #endif 525 if (signalpipe[0] > maxsock) 526 maxsock = signalpipe[0]; 527 if (signalpipe[1] > maxsock) 528 maxsock = signalpipe[1]; 529 530 for (;;) { 531 int n, ctrl; 532 fd_set readable; 533 534 #ifdef SANITY_CHECK 535 if (nsock == 0) { 536 syslog(LOG_ERR, "%s: nsock=0", __func__); 537 exit(EX_SOFTWARE); 538 } 539 #endif 540 readable = allsock; 541 if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) { 542 if (n < 0 && errno != EINTR) { 543 syslog(LOG_WARNING, "select: %m"); 544 sleep(1); 545 } 546 continue; 547 } 548 /* handle any queued signal flags */ 549 if (FD_ISSET(signalpipe[0], &readable)) { 550 int nsig; 551 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 552 syslog(LOG_ERR, "ioctl: %m"); 553 exit(EX_OSERR); 554 } 555 while (--nsig >= 0) { 556 char c; 557 if (read(signalpipe[0], &c, 1) != 1) { 558 syslog(LOG_ERR, "read: %m"); 559 exit(EX_OSERR); 560 } 561 if (debug) 562 warnx("handling signal flag %c", c); 563 switch(c) { 564 case 'A': /* sigalrm */ 565 retry(); 566 break; 567 case 'C': /* sigchld */ 568 reapchild(); 569 break; 570 case 'H': /* sighup */ 571 config(); 572 break; 573 } 574 } 575 } 576 for (sep = servtab; n && sep; sep = sep->se_next) 577 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 578 n--; 579 if (debug) 580 warnx("someone wants %s", sep->se_service); 581 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 582 conn = NULL; 583 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 584 i = 1; 585 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 586 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 587 ctrl = accept(sep->se_fd, NULL, NULL); 588 if (debug) 589 warnx("accept, ctrl %d", ctrl); 590 if (ctrl < 0) { 591 if (errno != EINTR) 592 syslog(LOG_WARNING, 593 "accept (for %s): %m", 594 sep->se_service); 595 if (sep->se_accept && 596 sep->se_socktype == SOCK_STREAM) 597 close(ctrl); 598 continue; 599 } 600 i = 0; 601 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 602 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 603 if (ioctl(ctrl, FIONBIO, &i) < 0) 604 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 605 if (cpmip(sep, ctrl) < 0) { 606 close(ctrl); 607 continue; 608 } 609 if (dofork && 610 (conn = search_conn(sep, ctrl)) != NULL && 611 !room_conn(sep, conn)) { 612 close(ctrl); 613 continue; 614 } 615 } else 616 ctrl = sep->se_fd; 617 if (dolog && !ISWRAP(sep)) { 618 char pname[INET6_ADDRSTRLEN] = "unknown"; 619 socklen_t sl; 620 sl = sizeof peermax; 621 if (getpeername(ctrl, (struct sockaddr *) 622 &peermax, &sl)) { 623 sl = sizeof peermax; 624 if (recvfrom(ctrl, buf, sizeof(buf), 625 MSG_PEEK, 626 (struct sockaddr *)&peermax, 627 &sl) >= 0) { 628 getnameinfo((struct sockaddr *)&peermax, 629 peer.sa_len, 630 pname, sizeof(pname), 631 NULL, 0, 632 NI_NUMERICHOST| 633 NI_WITHSCOPEID); 634 } 635 } else { 636 getnameinfo((struct sockaddr *)&peermax, 637 peer.sa_len, 638 pname, sizeof(pname), 639 NULL, 0, 640 NI_NUMERICHOST| 641 NI_WITHSCOPEID); 642 } 643 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 644 } 645 sigblock(SIGBLOCK); 646 pid = 0; 647 /* 648 * Fork for all external services, builtins which need to 649 * fork and anything we're wrapping (as wrapping might 650 * block or use hosts_options(5) twist). 651 */ 652 if (dofork) { 653 if (sep->se_count++ == 0) 654 gettimeofday(&sep->se_time, NULL); 655 else if (toomany > 0 && sep->se_count >= toomany) { 656 struct timeval now; 657 658 gettimeofday(&now, NULL); 659 if (now.tv_sec - sep->se_time.tv_sec > 660 CNT_INTVL) { 661 sep->se_time = now; 662 sep->se_count = 1; 663 } else { 664 syslog(LOG_ERR, 665 "%s/%s server failing (looping), service terminated", 666 sep->se_service, sep->se_proto); 667 if (sep->se_accept && 668 sep->se_socktype == SOCK_STREAM) 669 close(ctrl); 670 close_sep(sep); 671 free_conn(conn); 672 sigsetmask(0L); 673 if (!timingout) { 674 timingout = 1; 675 alarm(RETRYTIME); 676 } 677 continue; 678 } 679 } 680 pid = fork(); 681 } 682 if (pid < 0) { 683 syslog(LOG_ERR, "fork: %m"); 684 if (sep->se_accept && 685 sep->se_socktype == SOCK_STREAM) 686 close(ctrl); 687 free_conn(conn); 688 sigsetmask(0L); 689 sleep(1); 690 continue; 691 } 692 if (pid) { 693 addchild_conn(conn, pid); 694 addchild(sep, pid); 695 } 696 sigsetmask(0L); 697 if (pid == 0) { 698 if (dofork) { 699 sigaction(SIGALRM, &saalrm, NULL); 700 sigaction(SIGCHLD, &sachld, NULL); 701 sigaction(SIGHUP, &sahup, NULL); 702 /* SIGPIPE reset before exec */ 703 } 704 /* 705 * Call tcpmux to find the real service to exec. 706 */ 707 if (sep->se_bi && 708 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 709 sep = tcpmux(ctrl); 710 if (sep == NULL) { 711 close(ctrl); 712 _exit(0); 713 } 714 } 715 if (ISWRAP(sep)) { 716 inetd_setproctitle("wrapping", ctrl); 717 service = sep->se_server_name ? 718 sep->se_server_name : sep->se_service; 719 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL); 720 fromhost(&req); 721 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 722 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 723 denied = !hosts_access(&req); 724 if (denied) { 725 syslog(deny_severity, 726 "refused connection from %.500s, service %s (%s%s)", 727 eval_client(&req), service, sep->se_proto, 728 (whichaf(&req) == AF_INET6) ? "6" : ""); 729 if (sep->se_socktype != SOCK_STREAM) 730 recv(ctrl, buf, sizeof (buf), 0); 731 if (dofork) { 732 sleep(1); 733 _exit(0); 734 } 735 } 736 if (dolog) { 737 syslog(allow_severity, 738 "connection from %.500s, service %s (%s%s)", 739 eval_client(&req), service, sep->se_proto, 740 (whichaf(&req) == AF_INET6) ? "6" : ""); 741 } 742 } 743 if (sep->se_bi) { 744 (*sep->se_bi->bi_fn)(ctrl, sep); 745 } else { 746 if (debug) 747 warnx("%d execl %s", 748 getpid(), sep->se_server); 749 /* Clear close-on-exec. */ 750 if (fcntl(ctrl, F_SETFD, 0) < 0) { 751 syslog(LOG_ERR, 752 "%s/%s: fcntl (F_SETFD, 0): %m", 753 sep->se_service, sep->se_proto); 754 _exit(EX_OSERR); 755 } 756 if (ctrl != 0) { 757 dup2(ctrl, 0); 758 close(ctrl); 759 } 760 dup2(0, 1); 761 dup2(0, 2); 762 if ((pwd = getpwnam(sep->se_user)) == NULL) { 763 syslog(LOG_ERR, 764 "%s/%s: %s: no such user", 765 sep->se_service, sep->se_proto, 766 sep->se_user); 767 if (sep->se_socktype != SOCK_STREAM) 768 recv(0, buf, sizeof (buf), 0); 769 _exit(EX_NOUSER); 770 } 771 grp = NULL; 772 if ( sep->se_group != NULL 773 && (grp = getgrnam(sep->se_group)) == NULL 774 ) { 775 syslog(LOG_ERR, 776 "%s/%s: %s: no such group", 777 sep->se_service, sep->se_proto, 778 sep->se_group); 779 if (sep->se_socktype != SOCK_STREAM) 780 recv(0, buf, sizeof (buf), 0); 781 _exit(EX_NOUSER); 782 } 783 if (grp != NULL) 784 pwd->pw_gid = grp->gr_gid; 785 #ifdef LOGIN_CAP 786 if ((lc = login_getclass(sep->se_class)) == NULL) { 787 /* error syslogged by getclass */ 788 syslog(LOG_ERR, 789 "%s/%s: %s: login class error", 790 sep->se_service, sep->se_proto, 791 sep->se_class); 792 if (sep->se_socktype != SOCK_STREAM) 793 recv(0, buf, sizeof (buf), 0); 794 _exit(EX_NOUSER); 795 } 796 #endif 797 if (setsid() < 0) { 798 syslog(LOG_ERR, 799 "%s: can't setsid(): %m", 800 sep->se_service); 801 /* _exit(EX_OSERR); not fatal yet */ 802 } 803 #ifdef LOGIN_CAP 804 if (setusercontext(lc, pwd, pwd->pw_uid, 805 LOGIN_SETALL) != 0) { 806 syslog(LOG_ERR, 807 "%s: can't setusercontext(..%s..): %m", 808 sep->se_service, sep->se_user); 809 _exit(EX_OSERR); 810 } 811 login_close(lc); 812 #else 813 if (pwd->pw_uid) { 814 if (setlogin(sep->se_user) < 0) { 815 syslog(LOG_ERR, 816 "%s: can't setlogin(%s): %m", 817 sep->se_service, sep->se_user); 818 /* _exit(EX_OSERR); not yet */ 819 } 820 if (setgid(pwd->pw_gid) < 0) { 821 syslog(LOG_ERR, 822 "%s: can't set gid %d: %m", 823 sep->se_service, pwd->pw_gid); 824 _exit(EX_OSERR); 825 } 826 initgroups(pwd->pw_name, 827 pwd->pw_gid); 828 if (setuid(pwd->pw_uid) < 0) { 829 syslog(LOG_ERR, 830 "%s: can't set uid %d: %m", 831 sep->se_service, pwd->pw_uid); 832 _exit(EX_OSERR); 833 } 834 } 835 #endif 836 sigaction(SIGPIPE, &sapipe, NULL); 837 execv(sep->se_server, sep->se_argv); 838 syslog(LOG_ERR, 839 "cannot execute %s: %m", sep->se_server); 840 if (sep->se_socktype != SOCK_STREAM) 841 recv(0, buf, sizeof (buf), 0); 842 } 843 if (dofork) 844 _exit(0); 845 } 846 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 847 close(ctrl); 848 } 849 } 850 } 851 852 /* 853 * Add a signal flag to the signal flag queue for later handling 854 */ 855 856 void 857 flag_signal(int c) 858 { 859 char ch = c; 860 861 if (write(signalpipe[1], &ch, 1) != 1) { 862 syslog(LOG_ERR, "write: %m"); 863 _exit(EX_OSERR); 864 } 865 } 866 867 /* 868 * Record a new child pid for this service. If we've reached the 869 * limit on children, then stop accepting incoming requests. 870 */ 871 872 void 873 addchild(struct servtab *sep, pid_t pid) 874 { 875 if (sep->se_maxchild <= 0) 876 return; 877 #ifdef SANITY_CHECK 878 if (sep->se_numchild >= sep->se_maxchild) { 879 syslog(LOG_ERR, "%s: %d >= %d", 880 __func__, sep->se_numchild, sep->se_maxchild); 881 exit(EX_SOFTWARE); 882 } 883 #endif 884 sep->se_pids[sep->se_numchild++] = pid; 885 if (sep->se_numchild == sep->se_maxchild) 886 disable(sep); 887 } 888 889 /* 890 * Some child process has exited. See if it's on somebody's list. 891 */ 892 893 void 894 flag_reapchild(int signo __unused) 895 { 896 flag_signal('C'); 897 } 898 899 void 900 reapchild(void) 901 { 902 int k, status; 903 pid_t pid; 904 struct servtab *sep; 905 906 for (;;) { 907 pid = wait3(&status, WNOHANG, NULL); 908 if (pid <= 0) 909 break; 910 if (debug) 911 warnx("%d reaped, %s %u", pid, 912 WIFEXITED(status) ? "status" : "signal", 913 WIFEXITED(status) ? WEXITSTATUS(status) 914 : WTERMSIG(status)); 915 for (sep = servtab; sep; sep = sep->se_next) { 916 for (k = 0; k < sep->se_numchild; k++) 917 if (sep->se_pids[k] == pid) 918 break; 919 if (k == sep->se_numchild) 920 continue; 921 if (sep->se_numchild == sep->se_maxchild) 922 enable(sep); 923 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 924 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 925 syslog(LOG_WARNING, 926 "%s[%d]: exited, %s %u", 927 sep->se_server, pid, 928 WIFEXITED(status) ? "status" : "signal", 929 WIFEXITED(status) ? WEXITSTATUS(status) 930 : WTERMSIG(status)); 931 break; 932 } 933 reapchild_conn(pid); 934 } 935 } 936 937 void 938 flag_config(int signo __unused) 939 { 940 flag_signal('H'); 941 } 942 943 void 944 config(void) 945 { 946 struct servtab *sep, *new, **sepp; 947 long omask; 948 #ifdef LOGIN_CAP 949 login_cap_t *lc = NULL; 950 #endif 951 952 953 if (!setconfig()) { 954 syslog(LOG_ERR, "%s: %m", CONFIG); 955 return; 956 } 957 for (sep = servtab; sep; sep = sep->se_next) 958 sep->se_checked = 0; 959 while ((new = getconfigent())) { 960 if (getpwnam(new->se_user) == NULL) { 961 syslog(LOG_ERR, 962 "%s/%s: no such user '%s', service ignored", 963 new->se_service, new->se_proto, new->se_user); 964 continue; 965 } 966 if (new->se_group && getgrnam(new->se_group) == NULL) { 967 syslog(LOG_ERR, 968 "%s/%s: no such group '%s', service ignored", 969 new->se_service, new->se_proto, new->se_group); 970 continue; 971 } 972 #ifdef LOGIN_CAP 973 if ((lc = login_getclass(new->se_class)) == NULL) { 974 /* error syslogged by getclass */ 975 syslog(LOG_ERR, 976 "%s/%s: %s: login class error, service ignored", 977 new->se_service, new->se_proto, new->se_class); 978 continue; 979 } 980 login_close(lc); 981 #endif 982 for (sep = servtab; sep; sep = sep->se_next) 983 if (strcmp(sep->se_service, new->se_service) == 0 && 984 strcmp(sep->se_proto, new->se_proto) == 0 && 985 sep->se_socktype == new->se_socktype && 986 sep->se_family == new->se_family) 987 break; 988 if (sep != NULL) { 989 int i; 990 991 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; } 992 omask = sigblock(SIGBLOCK); 993 if (sep->se_nomapped != new->se_nomapped) { 994 sep->se_nomapped = new->se_nomapped; 995 sep->se_reset = 1; 996 } 997 /* copy over outstanding child pids */ 998 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 999 new->se_numchild = sep->se_numchild; 1000 if (new->se_numchild > new->se_maxchild) 1001 new->se_numchild = new->se_maxchild; 1002 memcpy(new->se_pids, sep->se_pids, 1003 new->se_numchild * sizeof(*new->se_pids)); 1004 } 1005 SWAP(sep->se_pids, new->se_pids); 1006 sep->se_maxchild = new->se_maxchild; 1007 sep->se_numchild = new->se_numchild; 1008 sep->se_maxcpm = new->se_maxcpm; 1009 resize_conn(sep, new->se_maxperip); 1010 sep->se_maxperip = new->se_maxperip; 1011 sep->se_bi = new->se_bi; 1012 /* might need to turn on or off service now */ 1013 if (sep->se_fd >= 0) { 1014 if (sep->se_maxchild > 0 1015 && sep->se_numchild == sep->se_maxchild) { 1016 if (FD_ISSET(sep->se_fd, &allsock)) 1017 disable(sep); 1018 } else { 1019 if (!FD_ISSET(sep->se_fd, &allsock)) 1020 enable(sep); 1021 } 1022 } 1023 sep->se_accept = new->se_accept; 1024 SWAP(sep->se_user, new->se_user); 1025 SWAP(sep->se_group, new->se_group); 1026 #ifdef LOGIN_CAP 1027 SWAP(sep->se_class, new->se_class); 1028 #endif 1029 SWAP(sep->se_server, new->se_server); 1030 SWAP(sep->se_server_name, new->se_server_name); 1031 for (i = 0; i < MAXARGV; i++) 1032 SWAP(sep->se_argv[i], new->se_argv[i]); 1033 #ifdef IPSEC 1034 SWAP(sep->se_policy, new->se_policy); 1035 ipsecsetup(sep); 1036 #endif 1037 sigsetmask(omask); 1038 freeconfig(new); 1039 if (debug) 1040 print_service("REDO", sep); 1041 } else { 1042 sep = enter(new); 1043 if (debug) 1044 print_service("ADD ", sep); 1045 } 1046 sep->se_checked = 1; 1047 if (ISMUX(sep)) { 1048 sep->se_fd = -1; 1049 continue; 1050 } 1051 switch (sep->se_family) { 1052 case AF_INET: 1053 if (no_v4bind != 0) { 1054 sep->se_fd = -1; 1055 continue; 1056 } 1057 break; 1058 #ifdef INET6 1059 case AF_INET6: 1060 if (no_v6bind != 0) { 1061 sep->se_fd = -1; 1062 continue; 1063 } 1064 break; 1065 #endif 1066 } 1067 if (!sep->se_rpc) { 1068 if (sep->se_family != AF_UNIX) { 1069 sp = getservbyname(sep->se_service, sep->se_proto); 1070 if (sp == NULL) { 1071 syslog(LOG_ERR, "%s/%s: unknown service", 1072 sep->se_service, sep->se_proto); 1073 sep->se_checked = 0; 1074 continue; 1075 } 1076 } 1077 switch (sep->se_family) { 1078 case AF_INET: 1079 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1080 sep->se_ctrladdr4.sin_port = 1081 sp->s_port; 1082 sep->se_reset = 1; 1083 } 1084 break; 1085 #ifdef INET6 1086 case AF_INET6: 1087 if (sp->s_port != 1088 sep->se_ctrladdr6.sin6_port) { 1089 sep->se_ctrladdr6.sin6_port = 1090 sp->s_port; 1091 sep->se_reset = 1; 1092 } 1093 break; 1094 #endif 1095 } 1096 if (sep->se_reset != 0 && sep->se_fd >= 0) 1097 close_sep(sep); 1098 } else { 1099 rpc = getrpcbyname(sep->se_service); 1100 if (rpc == NULL) { 1101 syslog(LOG_ERR, "%s/%s unknown RPC service", 1102 sep->se_service, sep->se_proto); 1103 if (sep->se_fd != -1) 1104 close(sep->se_fd); 1105 sep->se_fd = -1; 1106 continue; 1107 } 1108 if (rpc->r_number != sep->se_rpc_prog) { 1109 if (sep->se_rpc_prog) 1110 unregisterrpc(sep); 1111 sep->se_rpc_prog = rpc->r_number; 1112 if (sep->se_fd != -1) 1113 close(sep->se_fd); 1114 sep->se_fd = -1; 1115 } 1116 } 1117 if (sep->se_fd == -1) 1118 setup(sep); 1119 } 1120 endconfig(); 1121 /* 1122 * Purge anything not looked at above. 1123 */ 1124 omask = sigblock(SIGBLOCK); 1125 sepp = &servtab; 1126 while ((sep = *sepp)) { 1127 if (sep->se_checked) { 1128 sepp = &sep->se_next; 1129 continue; 1130 } 1131 *sepp = sep->se_next; 1132 if (sep->se_fd >= 0) 1133 close_sep(sep); 1134 if (debug) 1135 print_service("FREE", sep); 1136 if (sep->se_rpc && sep->se_rpc_prog > 0) 1137 unregisterrpc(sep); 1138 freeconfig(sep); 1139 free(sep); 1140 } 1141 sigsetmask(omask); 1142 } 1143 1144 void 1145 unregisterrpc(struct servtab *sep) 1146 { 1147 u_int i; 1148 struct servtab *sepp; 1149 long omask; 1150 1151 omask = sigblock(SIGBLOCK); 1152 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1153 if (sepp == sep) 1154 continue; 1155 if (sep->se_checked == 0 || 1156 !sepp->se_rpc || 1157 sep->se_rpc_prog != sepp->se_rpc_prog) 1158 continue; 1159 return; 1160 } 1161 if (debug) 1162 print_service("UNREG", sep); 1163 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) 1164 pmap_unset(sep->se_rpc_prog, i); 1165 if (sep->se_fd != -1) 1166 close(sep->se_fd); 1167 sep->se_fd = -1; 1168 sigsetmask(omask); 1169 } 1170 1171 void 1172 flag_retry(int signo __unused) 1173 { 1174 flag_signal('A'); 1175 } 1176 1177 void 1178 retry(void) 1179 { 1180 struct servtab *sep; 1181 1182 timingout = 0; 1183 for (sep = servtab; sep; sep = sep->se_next) 1184 if (sep->se_fd == -1 && !ISMUX(sep)) 1185 setup(sep); 1186 } 1187 1188 void 1189 setup(struct servtab *sep) 1190 { 1191 int on = 1; 1192 1193 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1194 if (debug) 1195 warn("socket failed on %s/%s", 1196 sep->se_service, sep->se_proto); 1197 syslog(LOG_ERR, "%s/%s: socket: %m", 1198 sep->se_service, sep->se_proto); 1199 return; 1200 } 1201 /* Set all listening sockets to close-on-exec. */ 1202 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1203 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m", 1204 sep->se_service, sep->se_proto); 1205 close(sep->se_fd); 1206 return; 1207 } 1208 #define turnon(fd, opt) \ 1209 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1210 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1211 turnon(sep->se_fd, SO_DEBUG) < 0) 1212 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1213 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1214 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1215 #ifdef SO_PRIVSTATE 1216 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1217 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1218 #endif 1219 /* tftpd opens a new connection then needs more infos */ 1220 if ((sep->se_family == AF_INET6) && 1221 (strcmp(sep->se_proto, "udp") == 0) && 1222 (sep->se_accept == 0) && 1223 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO, 1224 (char *)&on, sizeof (on)) < 0)) 1225 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1226 if (sep->se_family == AF_INET6) { 1227 int flag = sep->se_nomapped ? 1 : 0; 1228 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1229 (char *)&flag, sizeof (flag)) < 0) 1230 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1231 } 1232 #undef turnon 1233 if (sep->se_type == TTCP_TYPE) 1234 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, 1235 (char *)&on, sizeof (on)) < 0) 1236 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); 1237 #ifdef IPV6_FAITH 1238 if (sep->se_type == FAITH_TYPE) { 1239 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1240 sizeof(on)) < 0) { 1241 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1242 } 1243 } 1244 #endif 1245 #ifdef IPSEC 1246 ipsecsetup(sep); 1247 #endif 1248 if (sep->se_family == AF_UNIX) { 1249 unlink(sep->se_ctrladdr_un.sun_path); 1250 umask(0777); /* Make socket with conservative permissions */ 1251 } 1252 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1253 sep->se_ctrladdr_size) < 0) { 1254 if (debug) 1255 warn("bind failed on %s/%s", 1256 sep->se_service, sep->se_proto); 1257 syslog(LOG_ERR, "%s/%s: bind: %m", 1258 sep->se_service, sep->se_proto); 1259 close(sep->se_fd); 1260 sep->se_fd = -1; 1261 if (!timingout) { 1262 timingout = 1; 1263 alarm(RETRYTIME); 1264 } 1265 if (sep->se_family == AF_UNIX) 1266 umask(mask); 1267 return; 1268 } 1269 if (sep->se_family == AF_UNIX) { 1270 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1271 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1272 syslog(LOG_ERR, "chown socket: %m"); 1273 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1274 syslog(LOG_ERR, "chmod socket: %m"); 1275 umask(mask); 1276 } 1277 if (sep->se_rpc) { 1278 u_int i; 1279 socklen_t len = sep->se_ctrladdr_size; 1280 1281 if (sep->se_family != AF_INET) { 1282 syslog(LOG_ERR, 1283 "%s/%s: unsupported address family for rpc", 1284 sep->se_service, sep->se_proto); 1285 close(sep->se_fd); 1286 sep->se_fd = -1; 1287 return; 1288 } 1289 if (getsockname(sep->se_fd, 1290 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1291 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1292 sep->se_service, sep->se_proto); 1293 close(sep->se_fd); 1294 sep->se_fd = -1; 1295 return; 1296 } 1297 if (debug) 1298 print_service("REG ", sep); 1299 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1300 pmap_unset(sep->se_rpc_prog, i); 1301 pmap_set(sep->se_rpc_prog, i, 1302 (sep->se_socktype == SOCK_DGRAM) 1303 ? IPPROTO_UDP : IPPROTO_TCP, 1304 ntohs(sep->se_ctrladdr4.sin_port)); 1305 } 1306 } 1307 if (sep->se_socktype == SOCK_STREAM) 1308 listen(sep->se_fd, 64); 1309 enable(sep); 1310 if (debug) { 1311 warnx("registered %s on %d", 1312 sep->se_server, sep->se_fd); 1313 } 1314 } 1315 1316 #ifdef IPSEC 1317 void 1318 ipsecsetup(struct servtab *sep) 1319 { 1320 char *buf; 1321 char *policy_in = NULL; 1322 char *policy_out = NULL; 1323 int level; 1324 int opt; 1325 1326 switch (sep->se_family) { 1327 case AF_INET: 1328 level = IPPROTO_IP; 1329 opt = IP_IPSEC_POLICY; 1330 break; 1331 #ifdef INET6 1332 case AF_INET6: 1333 level = IPPROTO_IPV6; 1334 opt = IPV6_IPSEC_POLICY; 1335 break; 1336 #endif 1337 default: 1338 return; 1339 } 1340 1341 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1342 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1343 policy_in = def_in; 1344 policy_out = def_out; 1345 } else { 1346 if (!strncmp("in", sep->se_policy, 2)) 1347 policy_in = sep->se_policy; 1348 else if (!strncmp("out", sep->se_policy, 3)) 1349 policy_out = sep->se_policy; 1350 else { 1351 syslog(LOG_ERR, "invalid security policy \"%s\"", 1352 sep->se_policy); 1353 return; 1354 } 1355 } 1356 1357 if (policy_in != NULL) { 1358 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1359 if (buf != NULL) { 1360 if (setsockopt(sep->se_fd, level, opt, 1361 buf, ipsec_get_policylen(buf)) < 0 && 1362 debug != 0) 1363 warnx("%s/%s: ipsec initialization failed; %s", 1364 sep->se_service, sep->se_proto, 1365 policy_in); 1366 free(buf); 1367 } else 1368 syslog(LOG_ERR, "invalid security policy \"%s\"", 1369 policy_in); 1370 } 1371 if (policy_out != NULL) { 1372 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1373 if (buf != NULL) { 1374 if (setsockopt(sep->se_fd, level, opt, 1375 buf, ipsec_get_policylen(buf)) < 0 && 1376 debug != 0) 1377 warnx("%s/%s: ipsec initialization failed; %s", 1378 sep->se_service, sep->se_proto, 1379 policy_out); 1380 free(buf); 1381 } else 1382 syslog(LOG_ERR, "invalid security policy \"%s\"", 1383 policy_out); 1384 } 1385 } 1386 #endif 1387 1388 /* 1389 * Finish with a service and its socket. 1390 */ 1391 void 1392 close_sep(struct servtab *sep) 1393 { 1394 if (sep->se_fd >= 0) { 1395 if (FD_ISSET(sep->se_fd, &allsock)) 1396 disable(sep); 1397 close(sep->se_fd); 1398 sep->se_fd = -1; 1399 } 1400 sep->se_count = 0; 1401 sep->se_numchild = 0; /* forget about any existing children */ 1402 } 1403 1404 int 1405 matchservent(const char *name1, const char *name2, const char *proto) 1406 { 1407 char **alias, *p; 1408 struct servent *se; 1409 1410 if (strcmp(proto, "unix") == 0) { 1411 if ((p = strrchr(name1, '/')) != NULL) 1412 name1 = p + 1; 1413 if ((p = strrchr(name2, '/')) != NULL) 1414 name2 = p + 1; 1415 } 1416 if (strcmp(name1, name2) == 0) 1417 return(1); 1418 if ((se = getservbyname(name1, proto)) != NULL) { 1419 if (strcmp(name2, se->s_name) == 0) 1420 return(1); 1421 for (alias = se->s_aliases; *alias; alias++) 1422 if (strcmp(name2, *alias) == 0) 1423 return(1); 1424 } 1425 return(0); 1426 } 1427 1428 struct servtab * 1429 enter(struct servtab *cp) 1430 { 1431 struct servtab *sep; 1432 long omask; 1433 1434 sep = (struct servtab *)malloc(sizeof (*sep)); 1435 if (sep == NULL) { 1436 syslog(LOG_ERR, "malloc: %m"); 1437 exit(EX_OSERR); 1438 } 1439 *sep = *cp; 1440 sep->se_fd = -1; 1441 omask = sigblock(SIGBLOCK); 1442 sep->se_next = servtab; 1443 servtab = sep; 1444 sigsetmask(omask); 1445 return (sep); 1446 } 1447 1448 void 1449 enable(struct servtab *sep) 1450 { 1451 if (debug) 1452 warnx( 1453 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1454 #ifdef SANITY_CHECK 1455 if (sep->se_fd < 0) { 1456 syslog(LOG_ERR, 1457 "%s: %s: bad fd", __func__, sep->se_service); 1458 exit(EX_SOFTWARE); 1459 } 1460 if (ISMUX(sep)) { 1461 syslog(LOG_ERR, 1462 "%s: %s: is mux", __func__, sep->se_service); 1463 exit(EX_SOFTWARE); 1464 } 1465 if (FD_ISSET(sep->se_fd, &allsock)) { 1466 syslog(LOG_ERR, 1467 "%s: %s: not off", __func__, sep->se_service); 1468 exit(EX_SOFTWARE); 1469 } 1470 nsock++; 1471 #endif 1472 FD_SET(sep->se_fd, &allsock); 1473 if (sep->se_fd > maxsock) 1474 maxsock = sep->se_fd; 1475 } 1476 1477 void 1478 disable(struct servtab *sep) 1479 { 1480 if (debug) 1481 warnx( 1482 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1483 #ifdef SANITY_CHECK 1484 if (sep->se_fd < 0) { 1485 syslog(LOG_ERR, 1486 "%s: %s: bad fd", __func__, sep->se_service); 1487 exit(EX_SOFTWARE); 1488 } 1489 if (ISMUX(sep)) { 1490 syslog(LOG_ERR, 1491 "%s: %s: is mux", __func__, sep->se_service); 1492 exit(EX_SOFTWARE); 1493 } 1494 if (!FD_ISSET(sep->se_fd, &allsock)) { 1495 syslog(LOG_ERR, 1496 "%s: %s: not on", __func__, sep->se_service); 1497 exit(EX_SOFTWARE); 1498 } 1499 if (nsock == 0) { 1500 syslog(LOG_ERR, "%s: nsock=0", __func__); 1501 exit(EX_SOFTWARE); 1502 } 1503 nsock--; 1504 #endif 1505 FD_CLR(sep->se_fd, &allsock); 1506 if (sep->se_fd == maxsock) 1507 maxsock--; 1508 } 1509 1510 FILE *fconfig = NULL; 1511 struct servtab serv; 1512 char line[LINE_MAX]; 1513 1514 int 1515 setconfig(void) 1516 { 1517 1518 if (fconfig != NULL) { 1519 fseek(fconfig, 0L, SEEK_SET); 1520 return (1); 1521 } 1522 fconfig = fopen(CONFIG, "r"); 1523 return (fconfig != NULL); 1524 } 1525 1526 void 1527 endconfig(void) 1528 { 1529 if (fconfig) { 1530 fclose(fconfig); 1531 fconfig = NULL; 1532 } 1533 } 1534 1535 struct servtab * 1536 getconfigent(void) 1537 { 1538 struct servtab *sep = &serv; 1539 int argc; 1540 char *cp, *arg, *s; 1541 char *versp; 1542 static char TCPMUX_TOKEN[] = "tcpmux/"; 1543 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1544 #ifdef IPSEC 1545 char *policy = NULL; 1546 #endif 1547 int v4bind = 0; 1548 #ifdef INET6 1549 int v6bind = 0; 1550 #endif 1551 int i; 1552 1553 more: 1554 while ((cp = nextline(fconfig)) != NULL) { 1555 #ifdef IPSEC 1556 /* lines starting with #@ is not a comment, but the policy */ 1557 if (cp[0] == '#' && cp[1] == '@') { 1558 char *p; 1559 for (p = cp + 2; p && *p && isspace(*p); p++) 1560 ; 1561 if (*p == '\0') { 1562 if (policy) 1563 free(policy); 1564 policy = NULL; 1565 } else if (ipsec_get_policylen(p) >= 0) { 1566 if (policy) 1567 free(policy); 1568 policy = newstr(p); 1569 } else { 1570 syslog(LOG_ERR, 1571 "%s: invalid ipsec policy \"%s\"", 1572 CONFIG, p); 1573 exit(EX_CONFIG); 1574 } 1575 } 1576 #endif 1577 if (*cp == '#' || *cp == '\0') 1578 continue; 1579 break; 1580 } 1581 if (cp == NULL) 1582 return (NULL); 1583 /* 1584 * clear the static buffer, since some fields (se_ctrladdr, 1585 * for example) don't get initialized here. 1586 */ 1587 memset(sep, 0, sizeof *sep); 1588 arg = skip(&cp); 1589 if (cp == NULL) { 1590 /* got an empty line containing just blanks/tabs. */ 1591 goto more; 1592 } 1593 if (arg[0] == ':') { /* :user:group:perm: */ 1594 char *user, *group, *perm; 1595 struct passwd *pw; 1596 struct group *gr; 1597 user = arg+1; 1598 if ((group = strchr(user, ':')) == NULL) { 1599 syslog(LOG_ERR, "no group after user '%s'", user); 1600 goto more; 1601 } 1602 *group++ = '\0'; 1603 if ((perm = strchr(group, ':')) == NULL) { 1604 syslog(LOG_ERR, "no mode after group '%s'", group); 1605 goto more; 1606 } 1607 *perm++ = '\0'; 1608 if ((pw = getpwnam(user)) == NULL) { 1609 syslog(LOG_ERR, "no such user '%s'", user); 1610 goto more; 1611 } 1612 sep->se_sockuid = pw->pw_uid; 1613 if ((gr = getgrnam(group)) == NULL) { 1614 syslog(LOG_ERR, "no such user '%s'", group); 1615 goto more; 1616 } 1617 sep->se_sockgid = gr->gr_gid; 1618 sep->se_sockmode = strtol(perm, &arg, 8); 1619 if (*arg != ':') { 1620 syslog(LOG_ERR, "bad mode '%s'", perm); 1621 goto more; 1622 } 1623 *arg++ = '\0'; 1624 } else { 1625 sep->se_sockuid = euid; 1626 sep->se_sockgid = egid; 1627 sep->se_sockmode = 0200; 1628 } 1629 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1630 char *c = arg + MUX_LEN; 1631 if (*c == '+') { 1632 sep->se_type = MUXPLUS_TYPE; 1633 c++; 1634 } else 1635 sep->se_type = MUX_TYPE; 1636 sep->se_service = newstr(c); 1637 } else { 1638 sep->se_service = newstr(arg); 1639 sep->se_type = NORM_TYPE; 1640 } 1641 arg = sskip(&cp); 1642 if (strcmp(arg, "stream") == 0) 1643 sep->se_socktype = SOCK_STREAM; 1644 else if (strcmp(arg, "dgram") == 0) 1645 sep->se_socktype = SOCK_DGRAM; 1646 else if (strcmp(arg, "rdm") == 0) 1647 sep->se_socktype = SOCK_RDM; 1648 else if (strcmp(arg, "seqpacket") == 0) 1649 sep->se_socktype = SOCK_SEQPACKET; 1650 else if (strcmp(arg, "raw") == 0) 1651 sep->se_socktype = SOCK_RAW; 1652 else 1653 sep->se_socktype = -1; 1654 1655 arg = sskip(&cp); 1656 if (strncmp(arg, "tcp", 3) == 0) { 1657 sep->se_proto = newstr(strsep(&arg, "/")); 1658 if (arg != NULL) { 1659 if (strcmp(arg, "ttcp") == 0) 1660 sep->se_type = TTCP_TYPE; 1661 else if (strcmp(arg, "faith") == 0) 1662 sep->se_type = FAITH_TYPE; 1663 } 1664 } else { 1665 if (sep->se_type == NORM_TYPE && 1666 strncmp(arg, "faith/", 6) == 0) { 1667 arg += 6; 1668 sep->se_type = FAITH_TYPE; 1669 } 1670 sep->se_proto = newstr(arg); 1671 } 1672 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1673 if (no_v4bind != 0) { 1674 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1675 sep->se_service); 1676 freeconfig(sep); 1677 goto more; 1678 } 1679 memmove(sep->se_proto, sep->se_proto + 4, 1680 strlen(sep->se_proto) + 1 - 4); 1681 sep->se_rpc = 1; 1682 sep->se_rpc_prog = sep->se_rpc_lowvers = 1683 sep->se_rpc_highvers = 0; 1684 memcpy(&sep->se_ctrladdr4, bind_sa4, 1685 sizeof(sep->se_ctrladdr4)); 1686 if ((versp = strrchr(sep->se_service, '/'))) { 1687 *versp++ = '\0'; 1688 switch (sscanf(versp, "%u-%u", 1689 &sep->se_rpc_lowvers, 1690 &sep->se_rpc_highvers)) { 1691 case 2: 1692 break; 1693 case 1: 1694 sep->se_rpc_highvers = 1695 sep->se_rpc_lowvers; 1696 break; 1697 default: 1698 syslog(LOG_ERR, 1699 "bad RPC version specifier; %s", 1700 sep->se_service); 1701 freeconfig(sep); 1702 goto more; 1703 } 1704 } 1705 else { 1706 sep->se_rpc_lowvers = 1707 sep->se_rpc_highvers = 1; 1708 } 1709 } 1710 sep->se_nomapped = 0; 1711 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1712 #ifdef INET6 1713 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1714 if (no_v6bind != 0) { 1715 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s", 1716 sep->se_service); 1717 freeconfig(sep); 1718 goto more; 1719 } 1720 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1721 v6bind = 1; 1722 continue; 1723 } 1724 #endif 1725 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1726 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1727 v4bind = 1; 1728 continue; 1729 } 1730 /* illegal version num */ 1731 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1732 freeconfig(sep); 1733 goto more; 1734 } 1735 if (strcmp(sep->se_proto, "unix") == 0) { 1736 sep->se_family = AF_UNIX; 1737 } else 1738 #ifdef INET6 1739 if (v6bind != 0) { 1740 sep->se_family = AF_INET6; 1741 if (v4bind == 0 || no_v4bind != 0) 1742 sep->se_nomapped = 1; 1743 } else 1744 #endif 1745 { /* default to v4 bind if not v6 bind */ 1746 if (no_v4bind != 0) { 1747 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1748 sep->se_service); 1749 freeconfig(sep); 1750 goto more; 1751 } 1752 sep->se_family = AF_INET; 1753 } 1754 /* init ctladdr */ 1755 switch(sep->se_family) { 1756 case AF_INET: 1757 memcpy(&sep->se_ctrladdr4, bind_sa4, 1758 sizeof(sep->se_ctrladdr4)); 1759 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1760 break; 1761 #ifdef INET6 1762 case AF_INET6: 1763 memcpy(&sep->se_ctrladdr6, bind_sa6, 1764 sizeof(sep->se_ctrladdr6)); 1765 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1766 break; 1767 #endif 1768 case AF_UNIX: 1769 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1770 syslog(LOG_ERR, 1771 "domain socket pathname too long for service %s", 1772 sep->se_service); 1773 goto more; 1774 } 1775 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1776 sep->se_ctrladdr_un.sun_family = sep->se_family; 1777 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1778 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1779 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1780 } 1781 arg = sskip(&cp); 1782 if (!strncmp(arg, "wait", 4)) 1783 sep->se_accept = 0; 1784 else if (!strncmp(arg, "nowait", 6)) 1785 sep->se_accept = 1; 1786 else { 1787 syslog(LOG_ERR, 1788 "%s: bad wait/nowait for service %s", 1789 CONFIG, sep->se_service); 1790 goto more; 1791 } 1792 sep->se_maxchild = -1; 1793 sep->se_maxcpm = -1; 1794 sep->se_maxperip = -1; 1795 if ((s = strchr(arg, '/')) != NULL) { 1796 char *eptr; 1797 u_long val; 1798 1799 val = strtoul(s + 1, &eptr, 10); 1800 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1801 syslog(LOG_ERR, 1802 "%s: bad max-child for service %s", 1803 CONFIG, sep->se_service); 1804 goto more; 1805 } 1806 if (debug) 1807 if (!sep->se_accept && val != 1) 1808 warnx("maxchild=%lu for wait service %s" 1809 " not recommended", val, sep->se_service); 1810 sep->se_maxchild = val; 1811 if (*eptr == '/') 1812 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1813 if (*eptr == '/') 1814 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1815 /* 1816 * explicitly do not check for \0 for future expansion / 1817 * backwards compatibility 1818 */ 1819 } 1820 if (ISMUX(sep)) { 1821 /* 1822 * Silently enforce "nowait" mode for TCPMUX services 1823 * since they don't have an assigned port to listen on. 1824 */ 1825 sep->se_accept = 1; 1826 if (strcmp(sep->se_proto, "tcp")) { 1827 syslog(LOG_ERR, 1828 "%s: bad protocol for tcpmux service %s", 1829 CONFIG, sep->se_service); 1830 goto more; 1831 } 1832 if (sep->se_socktype != SOCK_STREAM) { 1833 syslog(LOG_ERR, 1834 "%s: bad socket type for tcpmux service %s", 1835 CONFIG, sep->se_service); 1836 goto more; 1837 } 1838 } 1839 sep->se_user = newstr(sskip(&cp)); 1840 #ifdef LOGIN_CAP 1841 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1842 *s = '\0'; 1843 sep->se_class = newstr(s + 1); 1844 } else 1845 sep->se_class = newstr(RESOURCE_RC); 1846 #endif 1847 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1848 *s = '\0'; 1849 sep->se_group = newstr(s + 1); 1850 } else 1851 sep->se_group = NULL; 1852 sep->se_server = newstr(sskip(&cp)); 1853 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1854 sep->se_server_name++; 1855 if (strcmp(sep->se_server, "internal") == 0) { 1856 struct biltin *bi; 1857 1858 for (bi = biltins; bi->bi_service; bi++) 1859 if (bi->bi_socktype == sep->se_socktype && 1860 matchservent(bi->bi_service, sep->se_service, 1861 sep->se_proto)) 1862 break; 1863 if (bi->bi_service == 0) { 1864 syslog(LOG_ERR, "internal service %s unknown", 1865 sep->se_service); 1866 goto more; 1867 } 1868 sep->se_accept = 1; /* force accept mode for built-ins */ 1869 sep->se_bi = bi; 1870 } else 1871 sep->se_bi = NULL; 1872 if (sep->se_maxperip < 0) 1873 sep->se_maxperip = maxperip; 1874 if (sep->se_maxcpm < 0) 1875 sep->se_maxcpm = maxcpm; 1876 if (sep->se_maxchild < 0) { /* apply default max-children */ 1877 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1878 sep->se_maxchild = sep->se_bi->bi_maxchild; 1879 else if (sep->se_accept) 1880 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1881 else 1882 sep->se_maxchild = 1; 1883 } 1884 if (sep->se_maxchild > 0) { 1885 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1886 if (sep->se_pids == NULL) { 1887 syslog(LOG_ERR, "malloc: %m"); 1888 exit(EX_OSERR); 1889 } 1890 } 1891 argc = 0; 1892 for (arg = skip(&cp); cp; arg = skip(&cp)) 1893 if (argc < MAXARGV) { 1894 sep->se_argv[argc++] = newstr(arg); 1895 } else { 1896 syslog(LOG_ERR, 1897 "%s: too many arguments for service %s", 1898 CONFIG, sep->se_service); 1899 goto more; 1900 } 1901 while (argc <= MAXARGV) 1902 sep->se_argv[argc++] = NULL; 1903 for (i = 0; i < PERIPSIZE; ++i) 1904 LIST_INIT(&sep->se_conn[i]); 1905 #ifdef IPSEC 1906 sep->se_policy = policy ? newstr(policy) : NULL; 1907 #endif 1908 return (sep); 1909 } 1910 1911 void 1912 freeconfig(struct servtab *cp) 1913 { 1914 int i; 1915 1916 if (cp->se_service) 1917 free(cp->se_service); 1918 if (cp->se_proto) 1919 free(cp->se_proto); 1920 if (cp->se_user) 1921 free(cp->se_user); 1922 if (cp->se_group) 1923 free(cp->se_group); 1924 #ifdef LOGIN_CAP 1925 if (cp->se_class) 1926 free(cp->se_class); 1927 #endif 1928 if (cp->se_server) 1929 free(cp->se_server); 1930 if (cp->se_pids) 1931 free(cp->se_pids); 1932 for (i = 0; i < MAXARGV; i++) 1933 if (cp->se_argv[i]) 1934 free(cp->se_argv[i]); 1935 free_connlist(cp); 1936 #ifdef IPSEC 1937 if (cp->se_policy) 1938 free(cp->se_policy); 1939 #endif 1940 } 1941 1942 1943 /* 1944 * Safe skip - if skip returns null, log a syntax error in the 1945 * configuration file and exit. 1946 */ 1947 char * 1948 sskip(char **cpp) 1949 { 1950 char *cp; 1951 1952 cp = skip(cpp); 1953 if (cp == NULL) { 1954 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1955 exit(EX_DATAERR); 1956 } 1957 return (cp); 1958 } 1959 1960 char * 1961 skip(char **cpp) 1962 { 1963 char *cp = *cpp; 1964 char *start; 1965 char quote = '\0'; 1966 1967 again: 1968 while (*cp == ' ' || *cp == '\t') 1969 cp++; 1970 if (*cp == '\0') { 1971 int c; 1972 1973 c = getc(fconfig); 1974 ungetc(c, fconfig); 1975 if (c == ' ' || c == '\t') 1976 if ((cp = nextline(fconfig))) 1977 goto again; 1978 *cpp = NULL; 1979 return (NULL); 1980 } 1981 if (*cp == '"' || *cp == '\'') 1982 quote = *cp++; 1983 start = cp; 1984 if (quote) 1985 while (*cp && *cp != quote) 1986 cp++; 1987 else 1988 while (*cp && *cp != ' ' && *cp != '\t') 1989 cp++; 1990 if (*cp != '\0') 1991 *cp++ = '\0'; 1992 *cpp = cp; 1993 return (start); 1994 } 1995 1996 char * 1997 nextline(FILE *fd) 1998 { 1999 char *cp; 2000 2001 if (fgets(line, sizeof (line), fd) == NULL) 2002 return (NULL); 2003 cp = strchr(line, '\n'); 2004 if (cp) 2005 *cp = '\0'; 2006 return (line); 2007 } 2008 2009 char * 2010 newstr(const char *cp) 2011 { 2012 char *cr; 2013 2014 if ((cr = strdup(cp != NULL ? cp : ""))) 2015 return (cr); 2016 syslog(LOG_ERR, "strdup: %m"); 2017 exit(EX_OSERR); 2018 } 2019 2020 void 2021 inetd_setproctitle(const char *a, int s) 2022 { 2023 socklen_t size; 2024 struct sockaddr_storage ss; 2025 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2026 2027 size = sizeof(ss); 2028 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2029 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2030 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); 2031 sprintf(buf, "%s [%s]", a, pbuf); 2032 } else 2033 sprintf(buf, "%s", a); 2034 setproctitle("%s", buf); 2035 } 2036 2037 int 2038 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2039 { 2040 struct servtab *se2; 2041 char pname[INET6_ADDRSTRLEN]; 2042 2043 for (se2 = servtab; se2; se2 = se2->se_next) { 2044 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2045 continue; 2046 2047 switch (se2->se_family) { 2048 case AF_INET: 2049 if (((const struct sockaddr_in *)sa)->sin_port == 2050 se2->se_ctrladdr4.sin_port) 2051 goto isloop; 2052 continue; 2053 #ifdef INET6 2054 case AF_INET6: 2055 if (((const struct sockaddr_in *)sa)->sin_port == 2056 se2->se_ctrladdr4.sin_port) 2057 goto isloop; 2058 continue; 2059 #endif 2060 default: 2061 continue; 2062 } 2063 isloop: 2064 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2065 NI_NUMERICHOST|NI_WITHSCOPEID); 2066 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2067 sep->se_service, sep->se_proto, 2068 se2->se_service, se2->se_proto, 2069 pname); 2070 return 1; 2071 } 2072 return 0; 2073 } 2074 2075 /* 2076 * print_service: 2077 * Dump relevant information to stderr 2078 */ 2079 void 2080 print_service(const char *action, const struct servtab *sep) 2081 { 2082 fprintf(stderr, 2083 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2084 #ifdef LOGIN_CAP 2085 "class=%s" 2086 #endif 2087 " builtin=%p server=%s" 2088 #ifdef IPSEC 2089 " policy=\"%s\"" 2090 #endif 2091 "\n", 2092 action, sep->se_service, sep->se_proto, 2093 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2094 #ifdef LOGIN_CAP 2095 sep->se_class, 2096 #endif 2097 (void *) sep->se_bi, sep->se_server 2098 #ifdef IPSEC 2099 , (sep->se_policy ? sep->se_policy : "") 2100 #endif 2101 ); 2102 } 2103 2104 #define CPMHSIZE 256 2105 #define CPMHMASK (CPMHSIZE-1) 2106 #define CHTGRAN 10 2107 #define CHTSIZE 6 2108 2109 typedef struct CTime { 2110 unsigned long ct_Ticks; 2111 int ct_Count; 2112 } CTime; 2113 2114 typedef struct CHash { 2115 union { 2116 struct in_addr c4_Addr; 2117 struct in6_addr c6_Addr; 2118 } cu_Addr; 2119 #define ch_Addr4 cu_Addr.c4_Addr 2120 #define ch_Addr6 cu_Addr.c6_Addr 2121 int ch_Family; 2122 time_t ch_LTime; 2123 char *ch_Service; 2124 CTime ch_Times[CHTSIZE]; 2125 } CHash; 2126 2127 CHash CHashAry[CPMHSIZE]; 2128 2129 int 2130 cpmip(const struct servtab *sep, int ctrl) 2131 { 2132 struct sockaddr_storage rss; 2133 socklen_t rssLen = sizeof(rss); 2134 int r = 0; 2135 2136 /* 2137 * If getpeername() fails, just let it through (if logging is 2138 * enabled the condition is caught elsewhere) 2139 */ 2140 2141 if (sep->se_maxcpm > 0 && 2142 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2143 time_t t = time(NULL); 2144 int hv = 0xABC3D20F; 2145 int i; 2146 int cnt = 0; 2147 CHash *chBest = NULL; 2148 unsigned int ticks = t / CHTGRAN; 2149 struct sockaddr_in *sin4; 2150 #ifdef INET6 2151 struct sockaddr_in6 *sin6; 2152 #endif 2153 2154 sin4 = (struct sockaddr_in *)&rss; 2155 #ifdef INET6 2156 sin6 = (struct sockaddr_in6 *)&rss; 2157 #endif 2158 { 2159 char *p; 2160 int addrlen; 2161 2162 switch (rss.ss_family) { 2163 case AF_INET: 2164 p = (char *)&sin4->sin_addr; 2165 addrlen = sizeof(struct in_addr); 2166 break; 2167 #ifdef INET6 2168 case AF_INET6: 2169 p = (char *)&sin6->sin6_addr; 2170 addrlen = sizeof(struct in6_addr); 2171 break; 2172 #endif 2173 default: 2174 /* should not happen */ 2175 return -1; 2176 } 2177 2178 for (i = 0; i < addrlen; ++i, ++p) { 2179 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2180 } 2181 hv = (hv ^ (hv >> 16)); 2182 } 2183 for (i = 0; i < 5; ++i) { 2184 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2185 2186 if (rss.ss_family == AF_INET && 2187 ch->ch_Family == AF_INET && 2188 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2189 ch->ch_Service && strcmp(sep->se_service, 2190 ch->ch_Service) == 0) { 2191 chBest = ch; 2192 break; 2193 } 2194 #ifdef INET6 2195 if (rss.ss_family == AF_INET6 && 2196 ch->ch_Family == AF_INET6 && 2197 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2198 &ch->ch_Addr6) != 0 && 2199 ch->ch_Service && strcmp(sep->se_service, 2200 ch->ch_Service) == 0) { 2201 chBest = ch; 2202 break; 2203 } 2204 #endif 2205 if (chBest == NULL || ch->ch_LTime == 0 || 2206 ch->ch_LTime < chBest->ch_LTime) { 2207 chBest = ch; 2208 } 2209 } 2210 if ((rss.ss_family == AF_INET && 2211 (chBest->ch_Family != AF_INET || 2212 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2213 chBest->ch_Service == NULL || 2214 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2215 chBest->ch_Family = sin4->sin_family; 2216 chBest->ch_Addr4 = sin4->sin_addr; 2217 if (chBest->ch_Service) 2218 free(chBest->ch_Service); 2219 chBest->ch_Service = strdup(sep->se_service); 2220 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2221 } 2222 #ifdef INET6 2223 if ((rss.ss_family == AF_INET6 && 2224 (chBest->ch_Family != AF_INET6 || 2225 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2226 &chBest->ch_Addr6) == 0)) || 2227 chBest->ch_Service == NULL || 2228 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2229 chBest->ch_Family = sin6->sin6_family; 2230 chBest->ch_Addr6 = sin6->sin6_addr; 2231 if (chBest->ch_Service) 2232 free(chBest->ch_Service); 2233 chBest->ch_Service = strdup(sep->se_service); 2234 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2235 } 2236 #endif 2237 chBest->ch_LTime = t; 2238 { 2239 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2240 if (ct->ct_Ticks != ticks) { 2241 ct->ct_Ticks = ticks; 2242 ct->ct_Count = 0; 2243 } 2244 ++ct->ct_Count; 2245 } 2246 for (i = 0; i < CHTSIZE; ++i) { 2247 CTime *ct = &chBest->ch_Times[i]; 2248 if (ct->ct_Ticks <= ticks && 2249 ct->ct_Ticks >= ticks - CHTSIZE) { 2250 cnt += ct->ct_Count; 2251 } 2252 } 2253 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) { 2254 char pname[INET6_ADDRSTRLEN]; 2255 2256 getnameinfo((struct sockaddr *)&rss, 2257 ((struct sockaddr *)&rss)->sa_len, 2258 pname, sizeof(pname), NULL, 0, 2259 NI_NUMERICHOST|NI_WITHSCOPEID); 2260 r = -1; 2261 syslog(LOG_ERR, 2262 "%s from %s exceeded counts/min (limit %d/min)", 2263 sep->se_service, pname, 2264 sep->se_maxcpm); 2265 } 2266 } 2267 return(r); 2268 } 2269 2270 static struct conninfo * 2271 search_conn(struct servtab *sep, int ctrl) 2272 { 2273 struct sockaddr_storage ss; 2274 socklen_t sslen = sizeof(ss); 2275 struct conninfo *conn; 2276 int hv; 2277 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2278 2279 if (sep->se_maxperip <= 0) 2280 return NULL; 2281 2282 /* 2283 * If getpeername() fails, just let it through (if logging is 2284 * enabled the condition is caught elsewhere) 2285 */ 2286 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2287 return NULL; 2288 2289 switch (ss.ss_family) { 2290 case AF_INET: 2291 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2292 sizeof(struct in_addr)); 2293 break; 2294 #ifdef INET6 2295 case AF_INET6: 2296 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2297 sizeof(struct in6_addr)); 2298 break; 2299 #endif 2300 default: 2301 /* 2302 * Since we only support AF_INET and AF_INET6, just 2303 * let other than AF_INET and AF_INET6 through. 2304 */ 2305 return NULL; 2306 } 2307 2308 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2309 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 2310 return NULL; 2311 2312 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2313 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2314 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2315 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 && 2316 strcmp(pname, pname2) == 0) 2317 break; 2318 } 2319 2320 if (conn == NULL) { 2321 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2322 syslog(LOG_ERR, "malloc: %m"); 2323 exit(EX_OSERR); 2324 } 2325 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2326 if (conn->co_proc == NULL) { 2327 syslog(LOG_ERR, "malloc: %m"); 2328 exit(EX_OSERR); 2329 } 2330 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2331 conn->co_numchild = 0; 2332 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2333 } 2334 2335 /* 2336 * Since a child process is not invoked yet, we cannot 2337 * determine a pid of a child. So, co_proc and co_numchild 2338 * should be filled leter. 2339 */ 2340 2341 return conn; 2342 } 2343 2344 static int 2345 room_conn(struct servtab *sep, struct conninfo *conn) 2346 { 2347 char pname[NI_MAXHOST]; 2348 2349 if (conn->co_numchild >= sep->se_maxperip) { 2350 getnameinfo((struct sockaddr *)&conn->co_addr, 2351 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2352 NI_NUMERICHOST | NI_WITHSCOPEID); 2353 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2354 sep->se_service, pname, sep->se_maxperip); 2355 return 0; 2356 } 2357 return 1; 2358 } 2359 2360 static void 2361 addchild_conn(struct conninfo *conn, pid_t pid) 2362 { 2363 struct procinfo *proc; 2364 2365 if (conn == NULL) 2366 return; 2367 2368 if ((proc = search_proc(pid, 1)) != NULL) { 2369 if (proc->pr_conn != NULL) { 2370 syslog(LOG_ERR, 2371 "addchild_conn: child already on process list"); 2372 exit(EX_OSERR); 2373 } 2374 proc->pr_conn = conn; 2375 } 2376 2377 conn->co_proc[conn->co_numchild++] = proc; 2378 } 2379 2380 static void 2381 reapchild_conn(pid_t pid) 2382 { 2383 struct procinfo *proc; 2384 struct conninfo *conn; 2385 int i; 2386 2387 if ((proc = search_proc(pid, 0)) == NULL) 2388 return; 2389 if ((conn = proc->pr_conn) == NULL) 2390 return; 2391 for (i = 0; i < conn->co_numchild; ++i) 2392 if (conn->co_proc[i] == proc) { 2393 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2394 break; 2395 } 2396 free_proc(proc); 2397 free_conn(conn); 2398 } 2399 2400 static void 2401 resize_conn(struct servtab *sep, int maxpip) 2402 { 2403 struct conninfo *conn; 2404 int i, j; 2405 2406 if (sep->se_maxperip <= 0) 2407 return; 2408 if (maxpip <= 0) { 2409 free_connlist(sep); 2410 return; 2411 } 2412 for (i = 0; i < PERIPSIZE; ++i) { 2413 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2414 for (j = maxpip; j < conn->co_numchild; ++j) 2415 free_proc(conn->co_proc[j]); 2416 conn->co_proc = realloc(conn->co_proc, 2417 maxpip * sizeof(*conn->co_proc)); 2418 if (conn->co_proc == NULL) { 2419 syslog(LOG_ERR, "realloc: %m"); 2420 exit(EX_OSERR); 2421 } 2422 if (conn->co_numchild > maxpip) 2423 conn->co_numchild = maxpip; 2424 } 2425 } 2426 } 2427 2428 static void 2429 free_connlist(struct servtab *sep) 2430 { 2431 struct conninfo *conn; 2432 int i, j; 2433 2434 for (i = 0; i < PERIPSIZE; ++i) { 2435 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2436 for (j = 0; j < conn->co_numchild; ++j) 2437 free_proc(conn->co_proc[j]); 2438 conn->co_numchild = 0; 2439 free_conn(conn); 2440 } 2441 } 2442 } 2443 2444 static void 2445 free_conn(struct conninfo *conn) 2446 { 2447 if (conn == NULL) 2448 return; 2449 if (conn->co_numchild <= 0) { 2450 LIST_REMOVE(conn, co_link); 2451 free(conn->co_proc); 2452 free(conn); 2453 } 2454 } 2455 2456 static struct procinfo * 2457 search_proc(pid_t pid, int add) 2458 { 2459 struct procinfo *proc; 2460 int hv; 2461 2462 hv = hashval((char *)&pid, sizeof(pid)); 2463 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2464 if (proc->pr_pid == pid) 2465 break; 2466 } 2467 if (proc == NULL && add) { 2468 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2469 syslog(LOG_ERR, "malloc: %m"); 2470 exit(EX_OSERR); 2471 } 2472 proc->pr_pid = pid; 2473 proc->pr_conn = NULL; 2474 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2475 } 2476 return proc; 2477 } 2478 2479 static void 2480 free_proc(struct procinfo *proc) 2481 { 2482 if (proc == NULL) 2483 return; 2484 LIST_REMOVE(proc, pr_link); 2485 free(proc); 2486 } 2487 2488 static int 2489 hashval(char *p, int len) 2490 { 2491 int i, hv = 0xABC3D20F; 2492 2493 for (i = 0; i < len; ++i, ++p) 2494 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2495 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2496 return hv; 2497 } 2498