1 /* 2 * Copyright (c) 1983, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)from: inetd.c 8.4 (Berkeley) 4/13/94 35 * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $ 36 * $DragonFly: src/usr.sbin/inetd/inetd.c,v 1.11 2008/05/23 23:40:59 swildner Exp $ 37 */ 38 39 /* 40 * Inetd - Internet super-server 41 * 42 * This program invokes all internet services as needed. Connection-oriented 43 * services are invoked each time a connection is made, by creating a process. 44 * This process is passed the connection as file descriptor 0 and is expected 45 * to do a getpeername to find out the source host and port. 46 * 47 * Datagram oriented services are invoked when a datagram 48 * arrives; a process is created and passed a pending message 49 * on file descriptor 0. Datagram servers may either connect 50 * to their peer, freeing up the original socket for inetd 51 * to receive further messages on, or ``take over the socket'', 52 * processing all arriving datagrams and, eventually, timing 53 * out. The first type of server is said to be ``multi-threaded''; 54 * the second type of server ``single-threaded''. 55 * 56 * Inetd uses a configuration file which is read at startup 57 * and, possibly, at some later time in response to a hangup signal. 58 * The configuration file is ``free format'' with fields given in the 59 * order shown below. Continuation lines for an entry must begin with 60 * a space or tab. All fields must be present in each entry. 61 * 62 * service name must be in /etc/services 63 * or name a tcpmux service 64 * or specify a unix domain socket 65 * socket type stream/dgram/raw/rdm/seqpacket 66 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix 67 * wait/nowait single-threaded/multi-threaded 68 * user user to run daemon as 69 * server program full path name 70 * server program arguments maximum of MAXARGS (20) 71 * 72 * TCP services without official port numbers are handled with the 73 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 74 * requests. When a connection is made from a foreign host, the service 75 * requested is passed to tcpmux, which looks it up in the servtab list 76 * and returns the proper entry for the service. Tcpmux returns a 77 * negative reply if the service doesn't exist, otherwise the invoked 78 * server is expected to return the positive reply if the service type in 79 * inetd.conf file has the prefix "tcpmux/". If the service type has the 80 * prefix "tcpmux/+", tcpmux will return the positive reply for the 81 * process; this is for compatibility with older server code, and also 82 * allows you to invoke programs that use stdin/stdout without putting any 83 * special server code in them. Services that use tcpmux are "nowait" 84 * because they do not have a well-known port and hence cannot listen 85 * for new requests. 86 * 87 * For RPC services 88 * service name/version must be in /etc/rpc 89 * socket type stream/dgram/raw/rdm/seqpacket 90 * protocol rpc/tcp, rpc/udp 91 * wait/nowait single-threaded/multi-threaded 92 * user user to run daemon as 93 * server program full path name 94 * server program arguments maximum of MAXARGS 95 * 96 * Comment lines are indicated by a `#' in column 1. 97 * 98 * #ifdef IPSEC 99 * Comment lines that start with "#@" denote IPsec policy string, as described 100 * in ipsec_set_policy(3). This will affect all the following items in 101 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 102 * there's no IPsec policy. 103 * #endif 104 */ 105 #include <sys/param.h> 106 #include <sys/ioctl.h> 107 #include <sys/wait.h> 108 #include <sys/time.h> 109 #include <sys/resource.h> 110 #include <sys/stat.h> 111 #include <sys/un.h> 112 113 #include <netinet/in.h> 114 #include <netinet/tcp.h> 115 #include <arpa/inet.h> 116 #include <rpc/rpc.h> 117 #include <rpc/pmap_clnt.h> 118 119 #include <errno.h> 120 #include <err.h> 121 #include <fcntl.h> 122 #include <grp.h> 123 #include <netdb.h> 124 #include <pwd.h> 125 #include <signal.h> 126 #include <stdio.h> 127 #include <stdlib.h> 128 #include <string.h> 129 #include <syslog.h> 130 #include <tcpd.h> 131 #include <unistd.h> 132 #include <libutil.h> 133 #include <sysexits.h> 134 #include <ctype.h> 135 136 #include "inetd.h" 137 #include "pathnames.h" 138 139 #ifdef IPSEC 140 #include <netinet6/ipsec.h> 141 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 142 #undef IPSEC 143 #endif 144 #endif 145 146 /* wrapper for KAME-special getnameinfo() */ 147 #ifndef NI_WITHSCOPEID 148 #define NI_WITHSCOPEID 0 149 #endif 150 151 #ifndef LIBWRAP_ALLOW_FACILITY 152 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 153 #endif 154 #ifndef LIBWRAP_ALLOW_SEVERITY 155 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 156 #endif 157 #ifndef LIBWRAP_DENY_FACILITY 158 # define LIBWRAP_DENY_FACILITY LOG_AUTH 159 #endif 160 #ifndef LIBWRAP_DENY_SEVERITY 161 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 162 #endif 163 164 #define ISWRAP(sep) \ 165 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 166 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 167 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 168 || (sep)->se_socktype == SOCK_DGRAM)) 169 170 #ifdef LOGIN_CAP 171 #include <login_cap.h> 172 173 /* see init.c */ 174 #define RESOURCE_RC "daemon" 175 176 #endif 177 178 #ifndef MAXCHILD 179 #define MAXCHILD -1 /* maximum number of this service 180 < 0 = no limit */ 181 #endif 182 183 #ifndef MAXCPM 184 #define MAXCPM -1 /* rate limit invocations from a 185 single remote address, 186 < 0 = no limit */ 187 #endif 188 189 #ifndef MAXPERIP 190 #define MAXPERIP -1 /* maximum number of this service 191 from a single remote address, 192 < 0 = no limit */ 193 #endif 194 195 #ifndef TOOMANY 196 #define TOOMANY 256 /* don't start more than TOOMANY */ 197 #endif 198 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 199 #define RETRYTIME (60*10) /* retry after bind or server fail */ 200 #define MAX_MAXCHLD 32767 /* max allowable max children */ 201 202 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 203 204 void close_sep(struct servtab *); 205 void flag_signal(int); 206 void flag_config(int); 207 void config(void); 208 int cpmip(const struct servtab *, int); 209 void endconfig(void); 210 struct servtab *enter(struct servtab *); 211 void freeconfig(struct servtab *); 212 struct servtab *getconfigent(void); 213 int matchservent(const char *, const char *, const char *); 214 char *nextline(FILE *); 215 void addchild(struct servtab *, int); 216 void flag_reapchild(int); 217 void reapchild(void); 218 void enable(struct servtab *); 219 void disable(struct servtab *); 220 void flag_retry(int); 221 void retry(void); 222 int setconfig(void); 223 void setup(struct servtab *); 224 #ifdef IPSEC 225 void ipsecsetup(struct servtab *); 226 #endif 227 void unregisterrpc(struct servtab *sep); 228 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 229 static int room_conn(struct servtab *sep, struct conninfo *conn); 230 static void addchild_conn(struct conninfo *conn, pid_t pid); 231 static void reapchild_conn(pid_t pid); 232 static void free_conn(struct conninfo *conn); 233 static void resize_conn(struct servtab *sep, int maxperip); 234 static void free_connlist(struct servtab *sep); 235 static void free_proc(struct procinfo *); 236 static struct procinfo *search_proc(pid_t pid, int add); 237 static int hashval(char *p, int len); 238 239 int allow_severity; 240 int deny_severity; 241 int wrap_ex = 0; 242 int wrap_bi = 0; 243 int debug = 0; 244 int 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, (fd_set *)0, 542 (fd_set *)0, (struct timeval *)0)) <= 0) { 543 if (n < 0 && errno != EINTR) { 544 syslog(LOG_WARNING, "select: %m"); 545 sleep(1); 546 } 547 continue; 548 } 549 /* handle any queued signal flags */ 550 if (FD_ISSET(signalpipe[0], &readable)) { 551 int nsig; 552 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 553 syslog(LOG_ERR, "ioctl: %m"); 554 exit(EX_OSERR); 555 } 556 while (--nsig >= 0) { 557 char c; 558 if (read(signalpipe[0], &c, 1) != 1) { 559 syslog(LOG_ERR, "read: %m"); 560 exit(EX_OSERR); 561 } 562 if (debug) 563 warnx("handling signal flag %c", c); 564 switch(c) { 565 case 'A': /* sigalrm */ 566 retry(); 567 break; 568 case 'C': /* sigchld */ 569 reapchild(); 570 break; 571 case 'H': /* sighup */ 572 config(); 573 break; 574 } 575 } 576 } 577 for (sep = servtab; n && sep; sep = sep->se_next) 578 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 579 n--; 580 if (debug) 581 warnx("someone wants %s", sep->se_service); 582 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 583 conn = NULL; 584 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 585 i = 1; 586 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 587 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 588 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 589 (socklen_t *)0); 590 if (debug) 591 warnx("accept, ctrl %d", ctrl); 592 if (ctrl < 0) { 593 if (errno != EINTR) 594 syslog(LOG_WARNING, 595 "accept (for %s): %m", 596 sep->se_service); 597 if (sep->se_accept && 598 sep->se_socktype == SOCK_STREAM) 599 close(ctrl); 600 continue; 601 } 602 i = 0; 603 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 604 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 605 if (ioctl(ctrl, FIONBIO, &i) < 0) 606 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 607 if (cpmip(sep, ctrl) < 0) { 608 close(ctrl); 609 continue; 610 } 611 if (dofork && 612 (conn = search_conn(sep, ctrl)) != NULL && 613 !room_conn(sep, conn)) { 614 close(ctrl); 615 continue; 616 } 617 } else 618 ctrl = sep->se_fd; 619 if (dolog && !ISWRAP(sep)) { 620 char pname[INET6_ADDRSTRLEN] = "unknown"; 621 socklen_t sl; 622 sl = sizeof peermax; 623 if (getpeername(ctrl, (struct sockaddr *) 624 &peermax, &sl)) { 625 sl = sizeof peermax; 626 if (recvfrom(ctrl, buf, sizeof(buf), 627 MSG_PEEK, 628 (struct sockaddr *)&peermax, 629 &sl) >= 0) { 630 getnameinfo((struct sockaddr *)&peermax, 631 peer.sa_len, 632 pname, sizeof(pname), 633 NULL, 0, 634 NI_NUMERICHOST| 635 NI_WITHSCOPEID); 636 } 637 } else { 638 getnameinfo((struct sockaddr *)&peermax, 639 peer.sa_len, 640 pname, sizeof(pname), 641 NULL, 0, 642 NI_NUMERICHOST| 643 NI_WITHSCOPEID); 644 } 645 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 646 } 647 sigblock(SIGBLOCK); 648 pid = 0; 649 /* 650 * Fork for all external services, builtins which need to 651 * fork and anything we're wrapping (as wrapping might 652 * block or use hosts_options(5) twist). 653 */ 654 if (dofork) { 655 if (sep->se_count++ == 0) 656 gettimeofday(&sep->se_time, (struct timezone *)NULL); 657 else if (toomany > 0 && sep->se_count >= toomany) { 658 struct timeval now; 659 660 gettimeofday(&now, (struct timezone *)NULL); 661 if (now.tv_sec - sep->se_time.tv_sec > 662 CNT_INTVL) { 663 sep->se_time = now; 664 sep->se_count = 1; 665 } else { 666 syslog(LOG_ERR, 667 "%s/%s server failing (looping), service terminated", 668 sep->se_service, sep->se_proto); 669 if (sep->se_accept && 670 sep->se_socktype == SOCK_STREAM) 671 close(ctrl); 672 close_sep(sep); 673 free_conn(conn); 674 sigsetmask(0L); 675 if (!timingout) { 676 timingout = 1; 677 alarm(RETRYTIME); 678 } 679 continue; 680 } 681 } 682 pid = fork(); 683 } 684 if (pid < 0) { 685 syslog(LOG_ERR, "fork: %m"); 686 if (sep->se_accept && 687 sep->se_socktype == SOCK_STREAM) 688 close(ctrl); 689 free_conn(conn); 690 sigsetmask(0L); 691 sleep(1); 692 continue; 693 } 694 if (pid) { 695 addchild_conn(conn, pid); 696 addchild(sep, pid); 697 } 698 sigsetmask(0L); 699 if (pid == 0) { 700 if (dofork) { 701 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 702 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 703 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 704 /* SIGPIPE reset before exec */ 705 } 706 /* 707 * Call tcpmux to find the real service to exec. 708 */ 709 if (sep->se_bi && 710 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 711 sep = tcpmux(ctrl); 712 if (sep == NULL) { 713 close(ctrl); 714 _exit(0); 715 } 716 } 717 if (ISWRAP(sep)) { 718 inetd_setproctitle("wrapping", ctrl); 719 service = sep->se_server_name ? 720 sep->se_server_name : sep->se_service; 721 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL); 722 fromhost(&req); 723 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 724 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 725 denied = !hosts_access(&req); 726 if (denied) { 727 syslog(deny_severity, 728 "refused connection from %.500s, service %s (%s%s)", 729 eval_client(&req), service, sep->se_proto, 730 (whichaf(&req) == AF_INET6) ? "6" : ""); 731 if (sep->se_socktype != SOCK_STREAM) 732 recv(ctrl, buf, sizeof (buf), 0); 733 if (dofork) { 734 sleep(1); 735 _exit(0); 736 } 737 } 738 if (dolog) { 739 syslog(allow_severity, 740 "connection from %.500s, service %s (%s%s)", 741 eval_client(&req), service, sep->se_proto, 742 (whichaf(&req) == AF_INET6) ? "6" : ""); 743 } 744 } 745 if (sep->se_bi) { 746 (*sep->se_bi->bi_fn)(ctrl, sep); 747 } else { 748 if (debug) 749 warnx("%d execl %s", 750 getpid(), sep->se_server); 751 /* Clear close-on-exec. */ 752 if (fcntl(ctrl, F_SETFD, 0) < 0) { 753 syslog(LOG_ERR, 754 "%s/%s: fcntl (F_SETFD, 0): %m", 755 sep->se_service, sep->se_proto); 756 _exit(EX_OSERR); 757 } 758 if (ctrl != 0) { 759 dup2(ctrl, 0); 760 close(ctrl); 761 } 762 dup2(0, 1); 763 dup2(0, 2); 764 if ((pwd = getpwnam(sep->se_user)) == NULL) { 765 syslog(LOG_ERR, 766 "%s/%s: %s: no such user", 767 sep->se_service, sep->se_proto, 768 sep->se_user); 769 if (sep->se_socktype != SOCK_STREAM) 770 recv(0, buf, sizeof (buf), 0); 771 _exit(EX_NOUSER); 772 } 773 grp = NULL; 774 if ( sep->se_group != NULL 775 && (grp = getgrnam(sep->se_group)) == NULL 776 ) { 777 syslog(LOG_ERR, 778 "%s/%s: %s: no such group", 779 sep->se_service, sep->se_proto, 780 sep->se_group); 781 if (sep->se_socktype != SOCK_STREAM) 782 recv(0, buf, sizeof (buf), 0); 783 _exit(EX_NOUSER); 784 } 785 if (grp != NULL) 786 pwd->pw_gid = grp->gr_gid; 787 #ifdef LOGIN_CAP 788 if ((lc = login_getclass(sep->se_class)) == NULL) { 789 /* error syslogged by getclass */ 790 syslog(LOG_ERR, 791 "%s/%s: %s: login class error", 792 sep->se_service, sep->se_proto, 793 sep->se_class); 794 if (sep->se_socktype != SOCK_STREAM) 795 recv(0, buf, sizeof (buf), 0); 796 _exit(EX_NOUSER); 797 } 798 #endif 799 if (setsid() < 0) { 800 syslog(LOG_ERR, 801 "%s: can't setsid(): %m", 802 sep->se_service); 803 /* _exit(EX_OSERR); not fatal yet */ 804 } 805 #ifdef LOGIN_CAP 806 if (setusercontext(lc, pwd, pwd->pw_uid, 807 LOGIN_SETALL) != 0) { 808 syslog(LOG_ERR, 809 "%s: can't setusercontext(..%s..): %m", 810 sep->se_service, sep->se_user); 811 _exit(EX_OSERR); 812 } 813 login_close(lc); 814 #else 815 if (pwd->pw_uid) { 816 if (setlogin(sep->se_user) < 0) { 817 syslog(LOG_ERR, 818 "%s: can't setlogin(%s): %m", 819 sep->se_service, sep->se_user); 820 /* _exit(EX_OSERR); not yet */ 821 } 822 if (setgid(pwd->pw_gid) < 0) { 823 syslog(LOG_ERR, 824 "%s: can't set gid %d: %m", 825 sep->se_service, pwd->pw_gid); 826 _exit(EX_OSERR); 827 } 828 initgroups(pwd->pw_name, 829 pwd->pw_gid); 830 if (setuid(pwd->pw_uid) < 0) { 831 syslog(LOG_ERR, 832 "%s: can't set uid %d: %m", 833 sep->se_service, pwd->pw_uid); 834 _exit(EX_OSERR); 835 } 836 } 837 #endif 838 sigaction(SIGPIPE, &sapipe, 839 (struct sigaction *)0); 840 execv(sep->se_server, sep->se_argv); 841 syslog(LOG_ERR, 842 "cannot execute %s: %m", sep->se_server); 843 if (sep->se_socktype != SOCK_STREAM) 844 recv(0, buf, sizeof (buf), 0); 845 } 846 if (dofork) 847 _exit(0); 848 } 849 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 850 close(ctrl); 851 } 852 } 853 } 854 855 /* 856 * Add a signal flag to the signal flag queue for later handling 857 */ 858 859 void 860 flag_signal(int c) 861 { 862 char ch = c; 863 864 if (write(signalpipe[1], &ch, 1) != 1) { 865 syslog(LOG_ERR, "write: %m"); 866 _exit(EX_OSERR); 867 } 868 } 869 870 /* 871 * Record a new child pid for this service. If we've reached the 872 * limit on children, then stop accepting incoming requests. 873 */ 874 875 void 876 addchild(struct servtab *sep, pid_t pid) 877 { 878 if (sep->se_maxchild <= 0) 879 return; 880 #ifdef SANITY_CHECK 881 if (sep->se_numchild >= sep->se_maxchild) { 882 syslog(LOG_ERR, "%s: %d >= %d", 883 __func__, sep->se_numchild, sep->se_maxchild); 884 exit(EX_SOFTWARE); 885 } 886 #endif 887 sep->se_pids[sep->se_numchild++] = pid; 888 if (sep->se_numchild == sep->se_maxchild) 889 disable(sep); 890 } 891 892 /* 893 * Some child process has exited. See if it's on somebody's list. 894 */ 895 896 void 897 flag_reapchild(int signo __unused) 898 { 899 flag_signal('C'); 900 } 901 902 void 903 reapchild(void) 904 { 905 int k, status; 906 pid_t pid; 907 struct servtab *sep; 908 909 for (;;) { 910 pid = wait3(&status, WNOHANG, (struct rusage *)0); 911 if (pid <= 0) 912 break; 913 if (debug) 914 warnx("%d reaped, %s %u", pid, 915 WIFEXITED(status) ? "status" : "signal", 916 WIFEXITED(status) ? WEXITSTATUS(status) 917 : WTERMSIG(status)); 918 for (sep = servtab; sep; sep = sep->se_next) { 919 for (k = 0; k < sep->se_numchild; k++) 920 if (sep->se_pids[k] == pid) 921 break; 922 if (k == sep->se_numchild) 923 continue; 924 if (sep->se_numchild == sep->se_maxchild) 925 enable(sep); 926 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 927 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 928 syslog(LOG_WARNING, 929 "%s[%d]: exited, %s %u", 930 sep->se_server, pid, 931 WIFEXITED(status) ? "status" : "signal", 932 WIFEXITED(status) ? WEXITSTATUS(status) 933 : WTERMSIG(status)); 934 break; 935 } 936 reapchild_conn(pid); 937 } 938 } 939 940 void 941 flag_config(int signo __unused) 942 { 943 flag_signal('H'); 944 } 945 946 void 947 config(void) 948 { 949 struct servtab *sep, *new, **sepp; 950 long omask; 951 #ifdef LOGIN_CAP 952 login_cap_t *lc = NULL; 953 #endif 954 955 956 if (!setconfig()) { 957 syslog(LOG_ERR, "%s: %m", CONFIG); 958 return; 959 } 960 for (sep = servtab; sep; sep = sep->se_next) 961 sep->se_checked = 0; 962 while ((new = getconfigent())) { 963 if (getpwnam(new->se_user) == NULL) { 964 syslog(LOG_ERR, 965 "%s/%s: no such user '%s', service ignored", 966 new->se_service, new->se_proto, new->se_user); 967 continue; 968 } 969 if (new->se_group && getgrnam(new->se_group) == NULL) { 970 syslog(LOG_ERR, 971 "%s/%s: no such group '%s', service ignored", 972 new->se_service, new->se_proto, new->se_group); 973 continue; 974 } 975 #ifdef LOGIN_CAP 976 if ((lc = login_getclass(new->se_class)) == NULL) { 977 /* error syslogged by getclass */ 978 syslog(LOG_ERR, 979 "%s/%s: %s: login class error, service ignored", 980 new->se_service, new->se_proto, new->se_class); 981 continue; 982 } 983 login_close(lc); 984 #endif 985 for (sep = servtab; sep; sep = sep->se_next) 986 if (strcmp(sep->se_service, new->se_service) == 0 && 987 strcmp(sep->se_proto, new->se_proto) == 0 && 988 sep->se_socktype == new->se_socktype && 989 sep->se_family == new->se_family) 990 break; 991 if (sep != 0) { 992 int i; 993 994 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; } 995 omask = sigblock(SIGBLOCK); 996 if (sep->se_nomapped != new->se_nomapped) { 997 sep->se_nomapped = new->se_nomapped; 998 sep->se_reset = 1; 999 } 1000 /* copy over outstanding child pids */ 1001 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1002 new->se_numchild = sep->se_numchild; 1003 if (new->se_numchild > new->se_maxchild) 1004 new->se_numchild = new->se_maxchild; 1005 memcpy(new->se_pids, sep->se_pids, 1006 new->se_numchild * sizeof(*new->se_pids)); 1007 } 1008 SWAP(sep->se_pids, new->se_pids); 1009 sep->se_maxchild = new->se_maxchild; 1010 sep->se_numchild = new->se_numchild; 1011 sep->se_maxcpm = new->se_maxcpm; 1012 resize_conn(sep, new->se_maxperip); 1013 sep->se_maxperip = new->se_maxperip; 1014 sep->se_bi = new->se_bi; 1015 /* might need to turn on or off service now */ 1016 if (sep->se_fd >= 0) { 1017 if (sep->se_maxchild > 0 1018 && sep->se_numchild == sep->se_maxchild) { 1019 if (FD_ISSET(sep->se_fd, &allsock)) 1020 disable(sep); 1021 } else { 1022 if (!FD_ISSET(sep->se_fd, &allsock)) 1023 enable(sep); 1024 } 1025 } 1026 sep->se_accept = new->se_accept; 1027 SWAP(sep->se_user, new->se_user); 1028 SWAP(sep->se_group, new->se_group); 1029 #ifdef LOGIN_CAP 1030 SWAP(sep->se_class, new->se_class); 1031 #endif 1032 SWAP(sep->se_server, new->se_server); 1033 SWAP(sep->se_server_name, new->se_server_name); 1034 for (i = 0; i < MAXARGV; i++) 1035 SWAP(sep->se_argv[i], new->se_argv[i]); 1036 #ifdef IPSEC 1037 SWAP(sep->se_policy, new->se_policy); 1038 ipsecsetup(sep); 1039 #endif 1040 sigsetmask(omask); 1041 freeconfig(new); 1042 if (debug) 1043 print_service("REDO", sep); 1044 } else { 1045 sep = enter(new); 1046 if (debug) 1047 print_service("ADD ", sep); 1048 } 1049 sep->se_checked = 1; 1050 if (ISMUX(sep)) { 1051 sep->se_fd = -1; 1052 continue; 1053 } 1054 switch (sep->se_family) { 1055 case AF_INET: 1056 if (no_v4bind != 0) { 1057 sep->se_fd = -1; 1058 continue; 1059 } 1060 break; 1061 #ifdef INET6 1062 case AF_INET6: 1063 if (no_v6bind != 0) { 1064 sep->se_fd = -1; 1065 continue; 1066 } 1067 break; 1068 #endif 1069 } 1070 if (!sep->se_rpc) { 1071 if (sep->se_family != AF_UNIX) { 1072 sp = getservbyname(sep->se_service, sep->se_proto); 1073 if (sp == 0) { 1074 syslog(LOG_ERR, "%s/%s: unknown service", 1075 sep->se_service, sep->se_proto); 1076 sep->se_checked = 0; 1077 continue; 1078 } 1079 } 1080 switch (sep->se_family) { 1081 case AF_INET: 1082 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1083 sep->se_ctrladdr4.sin_port = 1084 sp->s_port; 1085 sep->se_reset = 1; 1086 } 1087 break; 1088 #ifdef INET6 1089 case AF_INET6: 1090 if (sp->s_port != 1091 sep->se_ctrladdr6.sin6_port) { 1092 sep->se_ctrladdr6.sin6_port = 1093 sp->s_port; 1094 sep->se_reset = 1; 1095 } 1096 break; 1097 #endif 1098 } 1099 if (sep->se_reset != 0 && sep->se_fd >= 0) 1100 close_sep(sep); 1101 } else { 1102 rpc = getrpcbyname(sep->se_service); 1103 if (rpc == 0) { 1104 syslog(LOG_ERR, "%s/%s unknown RPC service", 1105 sep->se_service, sep->se_proto); 1106 if (sep->se_fd != -1) 1107 close(sep->se_fd); 1108 sep->se_fd = -1; 1109 continue; 1110 } 1111 if (rpc->r_number != sep->se_rpc_prog) { 1112 if (sep->se_rpc_prog) 1113 unregisterrpc(sep); 1114 sep->se_rpc_prog = rpc->r_number; 1115 if (sep->se_fd != -1) 1116 close(sep->se_fd); 1117 sep->se_fd = -1; 1118 } 1119 } 1120 if (sep->se_fd == -1) 1121 setup(sep); 1122 } 1123 endconfig(); 1124 /* 1125 * Purge anything not looked at above. 1126 */ 1127 omask = sigblock(SIGBLOCK); 1128 sepp = &servtab; 1129 while ((sep = *sepp)) { 1130 if (sep->se_checked) { 1131 sepp = &sep->se_next; 1132 continue; 1133 } 1134 *sepp = sep->se_next; 1135 if (sep->se_fd >= 0) 1136 close_sep(sep); 1137 if (debug) 1138 print_service("FREE", sep); 1139 if (sep->se_rpc && sep->se_rpc_prog > 0) 1140 unregisterrpc(sep); 1141 freeconfig(sep); 1142 free(sep); 1143 } 1144 sigsetmask(omask); 1145 } 1146 1147 void 1148 unregisterrpc(struct servtab *sep) 1149 { 1150 u_int i; 1151 struct servtab *sepp; 1152 long omask; 1153 1154 omask = sigblock(SIGBLOCK); 1155 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1156 if (sepp == sep) 1157 continue; 1158 if (sep->se_checked == 0 || 1159 !sepp->se_rpc || 1160 sep->se_rpc_prog != sepp->se_rpc_prog) 1161 continue; 1162 return; 1163 } 1164 if (debug) 1165 print_service("UNREG", sep); 1166 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) 1167 pmap_unset(sep->se_rpc_prog, i); 1168 if (sep->se_fd != -1) 1169 close(sep->se_fd); 1170 sep->se_fd = -1; 1171 sigsetmask(omask); 1172 } 1173 1174 void 1175 flag_retry(int signo __unused) 1176 { 1177 flag_signal('A'); 1178 } 1179 1180 void 1181 retry(void) 1182 { 1183 struct servtab *sep; 1184 1185 timingout = 0; 1186 for (sep = servtab; sep; sep = sep->se_next) 1187 if (sep->se_fd == -1 && !ISMUX(sep)) 1188 setup(sep); 1189 } 1190 1191 void 1192 setup(struct servtab *sep) 1193 { 1194 int on = 1; 1195 1196 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1197 if (debug) 1198 warn("socket failed on %s/%s", 1199 sep->se_service, sep->se_proto); 1200 syslog(LOG_ERR, "%s/%s: socket: %m", 1201 sep->se_service, sep->se_proto); 1202 return; 1203 } 1204 /* Set all listening sockets to close-on-exec. */ 1205 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1206 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m", 1207 sep->se_service, sep->se_proto); 1208 close(sep->se_fd); 1209 return; 1210 } 1211 #define turnon(fd, opt) \ 1212 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1213 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1214 turnon(sep->se_fd, SO_DEBUG) < 0) 1215 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1216 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1217 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1218 #ifdef SO_PRIVSTATE 1219 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1220 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1221 #endif 1222 /* tftpd opens a new connection then needs more infos */ 1223 if ((sep->se_family == AF_INET6) && 1224 (strcmp(sep->se_proto, "udp") == 0) && 1225 (sep->se_accept == 0) && 1226 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO, 1227 (char *)&on, sizeof (on)) < 0)) 1228 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1229 if (sep->se_family == AF_INET6) { 1230 int flag = sep->se_nomapped ? 1 : 0; 1231 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1232 (char *)&flag, sizeof (flag)) < 0) 1233 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1234 } 1235 #undef turnon 1236 if (sep->se_type == TTCP_TYPE) 1237 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, 1238 (char *)&on, sizeof (on)) < 0) 1239 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); 1240 #ifdef IPV6_FAITH 1241 if (sep->se_type == FAITH_TYPE) { 1242 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1243 sizeof(on)) < 0) { 1244 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1245 } 1246 } 1247 #endif 1248 #ifdef IPSEC 1249 ipsecsetup(sep); 1250 #endif 1251 if (sep->se_family == AF_UNIX) { 1252 unlink(sep->se_ctrladdr_un.sun_path); 1253 umask(0777); /* Make socket with conservative permissions */ 1254 } 1255 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1256 sep->se_ctrladdr_size) < 0) { 1257 if (debug) 1258 warn("bind failed on %s/%s", 1259 sep->se_service, sep->se_proto); 1260 syslog(LOG_ERR, "%s/%s: bind: %m", 1261 sep->se_service, sep->se_proto); 1262 close(sep->se_fd); 1263 sep->se_fd = -1; 1264 if (!timingout) { 1265 timingout = 1; 1266 alarm(RETRYTIME); 1267 } 1268 if (sep->se_family == AF_UNIX) 1269 umask(mask); 1270 return; 1271 } 1272 if (sep->se_family == AF_UNIX) { 1273 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1274 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1275 syslog(LOG_ERR, "chown socket: %m"); 1276 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1277 syslog(LOG_ERR, "chmod socket: %m"); 1278 umask(mask); 1279 } 1280 if (sep->se_rpc) { 1281 u_int i; 1282 socklen_t len = sep->se_ctrladdr_size; 1283 1284 if (sep->se_family != AF_INET) { 1285 syslog(LOG_ERR, 1286 "%s/%s: unsupported address family for rpc", 1287 sep->se_service, sep->se_proto); 1288 close(sep->se_fd); 1289 sep->se_fd = -1; 1290 return; 1291 } 1292 if (getsockname(sep->se_fd, 1293 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1294 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1295 sep->se_service, sep->se_proto); 1296 close(sep->se_fd); 1297 sep->se_fd = -1; 1298 return; 1299 } 1300 if (debug) 1301 print_service("REG ", sep); 1302 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1303 pmap_unset(sep->se_rpc_prog, i); 1304 pmap_set(sep->se_rpc_prog, i, 1305 (sep->se_socktype == SOCK_DGRAM) 1306 ? IPPROTO_UDP : IPPROTO_TCP, 1307 ntohs(sep->se_ctrladdr4.sin_port)); 1308 } 1309 } 1310 if (sep->se_socktype == SOCK_STREAM) 1311 listen(sep->se_fd, 64); 1312 enable(sep); 1313 if (debug) { 1314 warnx("registered %s on %d", 1315 sep->se_server, sep->se_fd); 1316 } 1317 } 1318 1319 #ifdef IPSEC 1320 void 1321 ipsecsetup(struct servtab *sep) 1322 { 1323 char *buf; 1324 char *policy_in = NULL; 1325 char *policy_out = NULL; 1326 int level; 1327 int opt; 1328 1329 switch (sep->se_family) { 1330 case AF_INET: 1331 level = IPPROTO_IP; 1332 opt = IP_IPSEC_POLICY; 1333 break; 1334 #ifdef INET6 1335 case AF_INET6: 1336 level = IPPROTO_IPV6; 1337 opt = IPV6_IPSEC_POLICY; 1338 break; 1339 #endif 1340 default: 1341 return; 1342 } 1343 1344 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1345 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1346 policy_in = def_in; 1347 policy_out = def_out; 1348 } else { 1349 if (!strncmp("in", sep->se_policy, 2)) 1350 policy_in = sep->se_policy; 1351 else if (!strncmp("out", sep->se_policy, 3)) 1352 policy_out = sep->se_policy; 1353 else { 1354 syslog(LOG_ERR, "invalid security policy \"%s\"", 1355 sep->se_policy); 1356 return; 1357 } 1358 } 1359 1360 if (policy_in != NULL) { 1361 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1362 if (buf != NULL) { 1363 if (setsockopt(sep->se_fd, level, opt, 1364 buf, ipsec_get_policylen(buf)) < 0 && 1365 debug != 0) 1366 warnx("%s/%s: ipsec initialization failed; %s", 1367 sep->se_service, sep->se_proto, 1368 policy_in); 1369 free(buf); 1370 } else 1371 syslog(LOG_ERR, "invalid security policy \"%s\"", 1372 policy_in); 1373 } 1374 if (policy_out != NULL) { 1375 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1376 if (buf != NULL) { 1377 if (setsockopt(sep->se_fd, level, opt, 1378 buf, ipsec_get_policylen(buf)) < 0 && 1379 debug != 0) 1380 warnx("%s/%s: ipsec initialization failed; %s", 1381 sep->se_service, sep->se_proto, 1382 policy_out); 1383 free(buf); 1384 } else 1385 syslog(LOG_ERR, "invalid security policy \"%s\"", 1386 policy_out); 1387 } 1388 } 1389 #endif 1390 1391 /* 1392 * Finish with a service and its socket. 1393 */ 1394 void 1395 close_sep(struct servtab *sep) 1396 { 1397 if (sep->se_fd >= 0) { 1398 if (FD_ISSET(sep->se_fd, &allsock)) 1399 disable(sep); 1400 close(sep->se_fd); 1401 sep->se_fd = -1; 1402 } 1403 sep->se_count = 0; 1404 sep->se_numchild = 0; /* forget about any existing children */ 1405 } 1406 1407 int 1408 matchservent(const char *name1, const char *name2, const char *proto) 1409 { 1410 char **alias, *p; 1411 struct servent *se; 1412 1413 if (strcmp(proto, "unix") == 0) { 1414 if ((p = strrchr(name1, '/')) != NULL) 1415 name1 = p + 1; 1416 if ((p = strrchr(name2, '/')) != NULL) 1417 name2 = p + 1; 1418 } 1419 if (strcmp(name1, name2) == 0) 1420 return(1); 1421 if ((se = getservbyname(name1, proto)) != NULL) { 1422 if (strcmp(name2, se->s_name) == 0) 1423 return(1); 1424 for (alias = se->s_aliases; *alias; alias++) 1425 if (strcmp(name2, *alias) == 0) 1426 return(1); 1427 } 1428 return(0); 1429 } 1430 1431 struct servtab * 1432 enter(struct servtab *cp) 1433 { 1434 struct servtab *sep; 1435 long omask; 1436 1437 sep = (struct servtab *)malloc(sizeof (*sep)); 1438 if (sep == (struct servtab *)0) { 1439 syslog(LOG_ERR, "malloc: %m"); 1440 exit(EX_OSERR); 1441 } 1442 *sep = *cp; 1443 sep->se_fd = -1; 1444 omask = sigblock(SIGBLOCK); 1445 sep->se_next = servtab; 1446 servtab = sep; 1447 sigsetmask(omask); 1448 return (sep); 1449 } 1450 1451 void 1452 enable(struct servtab *sep) 1453 { 1454 if (debug) 1455 warnx( 1456 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1457 #ifdef SANITY_CHECK 1458 if (sep->se_fd < 0) { 1459 syslog(LOG_ERR, 1460 "%s: %s: bad fd", __func__, sep->se_service); 1461 exit(EX_SOFTWARE); 1462 } 1463 if (ISMUX(sep)) { 1464 syslog(LOG_ERR, 1465 "%s: %s: is mux", __func__, sep->se_service); 1466 exit(EX_SOFTWARE); 1467 } 1468 if (FD_ISSET(sep->se_fd, &allsock)) { 1469 syslog(LOG_ERR, 1470 "%s: %s: not off", __func__, sep->se_service); 1471 exit(EX_SOFTWARE); 1472 } 1473 nsock++; 1474 #endif 1475 FD_SET(sep->se_fd, &allsock); 1476 if (sep->se_fd > maxsock) 1477 maxsock = sep->se_fd; 1478 } 1479 1480 void 1481 disable(struct servtab *sep) 1482 { 1483 if (debug) 1484 warnx( 1485 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1486 #ifdef SANITY_CHECK 1487 if (sep->se_fd < 0) { 1488 syslog(LOG_ERR, 1489 "%s: %s: bad fd", __func__, sep->se_service); 1490 exit(EX_SOFTWARE); 1491 } 1492 if (ISMUX(sep)) { 1493 syslog(LOG_ERR, 1494 "%s: %s: is mux", __func__, sep->se_service); 1495 exit(EX_SOFTWARE); 1496 } 1497 if (!FD_ISSET(sep->se_fd, &allsock)) { 1498 syslog(LOG_ERR, 1499 "%s: %s: not on", __func__, sep->se_service); 1500 exit(EX_SOFTWARE); 1501 } 1502 if (nsock == 0) { 1503 syslog(LOG_ERR, "%s: nsock=0", __func__); 1504 exit(EX_SOFTWARE); 1505 } 1506 nsock--; 1507 #endif 1508 FD_CLR(sep->se_fd, &allsock); 1509 if (sep->se_fd == maxsock) 1510 maxsock--; 1511 } 1512 1513 FILE *fconfig = NULL; 1514 struct servtab serv; 1515 char line[LINE_MAX]; 1516 1517 int 1518 setconfig(void) 1519 { 1520 1521 if (fconfig != NULL) { 1522 fseek(fconfig, 0L, SEEK_SET); 1523 return (1); 1524 } 1525 fconfig = fopen(CONFIG, "r"); 1526 return (fconfig != NULL); 1527 } 1528 1529 void 1530 endconfig(void) 1531 { 1532 if (fconfig) { 1533 fclose(fconfig); 1534 fconfig = NULL; 1535 } 1536 } 1537 1538 struct servtab * 1539 getconfigent(void) 1540 { 1541 struct servtab *sep = &serv; 1542 int argc; 1543 char *cp, *arg, *s; 1544 char *versp; 1545 static char TCPMUX_TOKEN[] = "tcpmux/"; 1546 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1547 #ifdef IPSEC 1548 char *policy = NULL; 1549 #endif 1550 int v4bind = 0; 1551 #ifdef INET6 1552 int v6bind = 0; 1553 #endif 1554 int i; 1555 1556 more: 1557 while ((cp = nextline(fconfig)) != NULL) { 1558 #ifdef IPSEC 1559 /* lines starting with #@ is not a comment, but the policy */ 1560 if (cp[0] == '#' && cp[1] == '@') { 1561 char *p; 1562 for (p = cp + 2; p && *p && isspace(*p); p++) 1563 ; 1564 if (*p == '\0') { 1565 if (policy) 1566 free(policy); 1567 policy = NULL; 1568 } else if (ipsec_get_policylen(p) >= 0) { 1569 if (policy) 1570 free(policy); 1571 policy = newstr(p); 1572 } else { 1573 syslog(LOG_ERR, 1574 "%s: invalid ipsec policy \"%s\"", 1575 CONFIG, p); 1576 exit(EX_CONFIG); 1577 } 1578 } 1579 #endif 1580 if (*cp == '#' || *cp == '\0') 1581 continue; 1582 break; 1583 } 1584 if (cp == NULL) 1585 return ((struct servtab *)0); 1586 /* 1587 * clear the static buffer, since some fields (se_ctrladdr, 1588 * for example) don't get initialized here. 1589 */ 1590 memset(sep, 0, sizeof *sep); 1591 arg = skip(&cp); 1592 if (cp == NULL) { 1593 /* got an empty line containing just blanks/tabs. */ 1594 goto more; 1595 } 1596 if (arg[0] == ':') { /* :user:group:perm: */ 1597 char *user, *group, *perm; 1598 struct passwd *pw; 1599 struct group *gr; 1600 user = arg+1; 1601 if ((group = strchr(user, ':')) == NULL) { 1602 syslog(LOG_ERR, "no group after user '%s'", user); 1603 goto more; 1604 } 1605 *group++ = '\0'; 1606 if ((perm = strchr(group, ':')) == NULL) { 1607 syslog(LOG_ERR, "no mode after group '%s'", group); 1608 goto more; 1609 } 1610 *perm++ = '\0'; 1611 if ((pw = getpwnam(user)) == NULL) { 1612 syslog(LOG_ERR, "no such user '%s'", user); 1613 goto more; 1614 } 1615 sep->se_sockuid = pw->pw_uid; 1616 if ((gr = getgrnam(group)) == NULL) { 1617 syslog(LOG_ERR, "no such user '%s'", group); 1618 goto more; 1619 } 1620 sep->se_sockgid = gr->gr_gid; 1621 sep->se_sockmode = strtol(perm, &arg, 8); 1622 if (*arg != ':') { 1623 syslog(LOG_ERR, "bad mode '%s'", perm); 1624 goto more; 1625 } 1626 *arg++ = '\0'; 1627 } else { 1628 sep->se_sockuid = euid; 1629 sep->se_sockgid = egid; 1630 sep->se_sockmode = 0200; 1631 } 1632 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1633 char *c = arg + MUX_LEN; 1634 if (*c == '+') { 1635 sep->se_type = MUXPLUS_TYPE; 1636 c++; 1637 } else 1638 sep->se_type = MUX_TYPE; 1639 sep->se_service = newstr(c); 1640 } else { 1641 sep->se_service = newstr(arg); 1642 sep->se_type = NORM_TYPE; 1643 } 1644 arg = sskip(&cp); 1645 if (strcmp(arg, "stream") == 0) 1646 sep->se_socktype = SOCK_STREAM; 1647 else if (strcmp(arg, "dgram") == 0) 1648 sep->se_socktype = SOCK_DGRAM; 1649 else if (strcmp(arg, "rdm") == 0) 1650 sep->se_socktype = SOCK_RDM; 1651 else if (strcmp(arg, "seqpacket") == 0) 1652 sep->se_socktype = SOCK_SEQPACKET; 1653 else if (strcmp(arg, "raw") == 0) 1654 sep->se_socktype = SOCK_RAW; 1655 else 1656 sep->se_socktype = -1; 1657 1658 arg = sskip(&cp); 1659 if (strncmp(arg, "tcp", 3) == 0) { 1660 sep->se_proto = newstr(strsep(&arg, "/")); 1661 if (arg != NULL) { 1662 if (strcmp(arg, "ttcp") == 0) 1663 sep->se_type = TTCP_TYPE; 1664 else if (strcmp(arg, "faith") == 0) 1665 sep->se_type = FAITH_TYPE; 1666 } 1667 } else { 1668 if (sep->se_type == NORM_TYPE && 1669 strncmp(arg, "faith/", 6) == 0) { 1670 arg += 6; 1671 sep->se_type = FAITH_TYPE; 1672 } 1673 sep->se_proto = newstr(arg); 1674 } 1675 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1676 if (no_v4bind != 0) { 1677 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1678 sep->se_service); 1679 freeconfig(sep); 1680 goto more; 1681 } 1682 memmove(sep->se_proto, sep->se_proto + 4, 1683 strlen(sep->se_proto) + 1 - 4); 1684 sep->se_rpc = 1; 1685 sep->se_rpc_prog = sep->se_rpc_lowvers = 1686 sep->se_rpc_lowvers = 0; 1687 memcpy(&sep->se_ctrladdr4, bind_sa4, 1688 sizeof(sep->se_ctrladdr4)); 1689 if ((versp = strrchr(sep->se_service, '/'))) { 1690 *versp++ = '\0'; 1691 switch (sscanf(versp, "%u-%u", 1692 &sep->se_rpc_lowvers, 1693 &sep->se_rpc_highvers)) { 1694 case 2: 1695 break; 1696 case 1: 1697 sep->se_rpc_highvers = 1698 sep->se_rpc_lowvers; 1699 break; 1700 default: 1701 syslog(LOG_ERR, 1702 "bad RPC version specifier; %s", 1703 sep->se_service); 1704 freeconfig(sep); 1705 goto more; 1706 } 1707 } 1708 else { 1709 sep->se_rpc_lowvers = 1710 sep->se_rpc_highvers = 1; 1711 } 1712 } 1713 sep->se_nomapped = 0; 1714 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1715 #ifdef INET6 1716 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1717 if (no_v6bind != 0) { 1718 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s", 1719 sep->se_service); 1720 freeconfig(sep); 1721 goto more; 1722 } 1723 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1724 v6bind = 1; 1725 continue; 1726 } 1727 #endif 1728 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1729 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1730 v4bind = 1; 1731 continue; 1732 } 1733 /* illegal version num */ 1734 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1735 freeconfig(sep); 1736 goto more; 1737 } 1738 if (strcmp(sep->se_proto, "unix") == 0) { 1739 sep->se_family = AF_UNIX; 1740 } else 1741 #ifdef INET6 1742 if (v6bind != 0) { 1743 sep->se_family = AF_INET6; 1744 if (v4bind == 0 || no_v4bind != 0) 1745 sep->se_nomapped = 1; 1746 } else 1747 #endif 1748 { /* default to v4 bind if not v6 bind */ 1749 if (no_v4bind != 0) { 1750 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1751 sep->se_service); 1752 freeconfig(sep); 1753 goto more; 1754 } 1755 sep->se_family = AF_INET; 1756 } 1757 /* init ctladdr */ 1758 switch(sep->se_family) { 1759 case AF_INET: 1760 memcpy(&sep->se_ctrladdr4, bind_sa4, 1761 sizeof(sep->se_ctrladdr4)); 1762 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1763 break; 1764 #ifdef INET6 1765 case AF_INET6: 1766 memcpy(&sep->se_ctrladdr6, bind_sa6, 1767 sizeof(sep->se_ctrladdr6)); 1768 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1769 break; 1770 #endif 1771 case AF_UNIX: 1772 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1773 syslog(LOG_ERR, 1774 "domain socket pathname too long for service %s", 1775 sep->se_service); 1776 goto more; 1777 } 1778 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1779 sep->se_ctrladdr_un.sun_family = sep->se_family; 1780 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1781 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1782 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1783 } 1784 arg = sskip(&cp); 1785 if (!strncmp(arg, "wait", 4)) 1786 sep->se_accept = 0; 1787 else if (!strncmp(arg, "nowait", 6)) 1788 sep->se_accept = 1; 1789 else { 1790 syslog(LOG_ERR, 1791 "%s: bad wait/nowait for service %s", 1792 CONFIG, sep->se_service); 1793 goto more; 1794 } 1795 sep->se_maxchild = -1; 1796 sep->se_maxcpm = -1; 1797 sep->se_maxperip = -1; 1798 if ((s = strchr(arg, '/')) != NULL) { 1799 char *eptr; 1800 u_long val; 1801 1802 val = strtoul(s + 1, &eptr, 10); 1803 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1804 syslog(LOG_ERR, 1805 "%s: bad max-child for service %s", 1806 CONFIG, sep->se_service); 1807 goto more; 1808 } 1809 if (debug) 1810 if (!sep->se_accept && val != 1) 1811 warnx("maxchild=%lu for wait service %s" 1812 " not recommended", val, sep->se_service); 1813 sep->se_maxchild = val; 1814 if (*eptr == '/') 1815 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1816 if (*eptr == '/') 1817 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1818 /* 1819 * explicitly do not check for \0 for future expansion / 1820 * backwards compatibility 1821 */ 1822 } 1823 if (ISMUX(sep)) { 1824 /* 1825 * Silently enforce "nowait" mode for TCPMUX services 1826 * since they don't have an assigned port to listen on. 1827 */ 1828 sep->se_accept = 1; 1829 if (strcmp(sep->se_proto, "tcp")) { 1830 syslog(LOG_ERR, 1831 "%s: bad protocol for tcpmux service %s", 1832 CONFIG, sep->se_service); 1833 goto more; 1834 } 1835 if (sep->se_socktype != SOCK_STREAM) { 1836 syslog(LOG_ERR, 1837 "%s: bad socket type for tcpmux service %s", 1838 CONFIG, sep->se_service); 1839 goto more; 1840 } 1841 } 1842 sep->se_user = newstr(sskip(&cp)); 1843 #ifdef LOGIN_CAP 1844 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1845 *s = '\0'; 1846 sep->se_class = newstr(s + 1); 1847 } else 1848 sep->se_class = newstr(RESOURCE_RC); 1849 #endif 1850 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1851 *s = '\0'; 1852 sep->se_group = newstr(s + 1); 1853 } else 1854 sep->se_group = NULL; 1855 sep->se_server = newstr(sskip(&cp)); 1856 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1857 sep->se_server_name++; 1858 if (strcmp(sep->se_server, "internal") == 0) { 1859 struct biltin *bi; 1860 1861 for (bi = biltins; bi->bi_service; bi++) 1862 if (bi->bi_socktype == sep->se_socktype && 1863 matchservent(bi->bi_service, sep->se_service, 1864 sep->se_proto)) 1865 break; 1866 if (bi->bi_service == 0) { 1867 syslog(LOG_ERR, "internal service %s unknown", 1868 sep->se_service); 1869 goto more; 1870 } 1871 sep->se_accept = 1; /* force accept mode for built-ins */ 1872 sep->se_bi = bi; 1873 } else 1874 sep->se_bi = NULL; 1875 if (sep->se_maxperip < 0) 1876 sep->se_maxperip = maxperip; 1877 if (sep->se_maxcpm < 0) 1878 sep->se_maxcpm = maxcpm; 1879 if (sep->se_maxchild < 0) { /* apply default max-children */ 1880 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1881 sep->se_maxchild = sep->se_bi->bi_maxchild; 1882 else if (sep->se_accept) 1883 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1884 else 1885 sep->se_maxchild = 1; 1886 } 1887 if (sep->se_maxchild > 0) { 1888 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1889 if (sep->se_pids == NULL) { 1890 syslog(LOG_ERR, "malloc: %m"); 1891 exit(EX_OSERR); 1892 } 1893 } 1894 argc = 0; 1895 for (arg = skip(&cp); cp; arg = skip(&cp)) 1896 if (argc < MAXARGV) { 1897 sep->se_argv[argc++] = newstr(arg); 1898 } else { 1899 syslog(LOG_ERR, 1900 "%s: too many arguments for service %s", 1901 CONFIG, sep->se_service); 1902 goto more; 1903 } 1904 while (argc <= MAXARGV) 1905 sep->se_argv[argc++] = NULL; 1906 for (i = 0; i < PERIPSIZE; ++i) 1907 LIST_INIT(&sep->se_conn[i]); 1908 #ifdef IPSEC 1909 sep->se_policy = policy ? newstr(policy) : NULL; 1910 #endif 1911 return (sep); 1912 } 1913 1914 void 1915 freeconfig(struct servtab *cp) 1916 { 1917 int i; 1918 1919 if (cp->se_service) 1920 free(cp->se_service); 1921 if (cp->se_proto) 1922 free(cp->se_proto); 1923 if (cp->se_user) 1924 free(cp->se_user); 1925 if (cp->se_group) 1926 free(cp->se_group); 1927 #ifdef LOGIN_CAP 1928 if (cp->se_class) 1929 free(cp->se_class); 1930 #endif 1931 if (cp->se_server) 1932 free(cp->se_server); 1933 if (cp->se_pids) 1934 free(cp->se_pids); 1935 for (i = 0; i < MAXARGV; i++) 1936 if (cp->se_argv[i]) 1937 free(cp->se_argv[i]); 1938 free_connlist(cp); 1939 #ifdef IPSEC 1940 if (cp->se_policy) 1941 free(cp->se_policy); 1942 #endif 1943 } 1944 1945 1946 /* 1947 * Safe skip - if skip returns null, log a syntax error in the 1948 * configuration file and exit. 1949 */ 1950 char * 1951 sskip(char **cpp) 1952 { 1953 char *cp; 1954 1955 cp = skip(cpp); 1956 if (cp == NULL) { 1957 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1958 exit(EX_DATAERR); 1959 } 1960 return (cp); 1961 } 1962 1963 char * 1964 skip(char **cpp) 1965 { 1966 char *cp = *cpp; 1967 char *start; 1968 char quote = '\0'; 1969 1970 again: 1971 while (*cp == ' ' || *cp == '\t') 1972 cp++; 1973 if (*cp == '\0') { 1974 int c; 1975 1976 c = getc(fconfig); 1977 ungetc(c, fconfig); 1978 if (c == ' ' || c == '\t') 1979 if ((cp = nextline(fconfig))) 1980 goto again; 1981 *cpp = (char *)0; 1982 return ((char *)0); 1983 } 1984 if (*cp == '"' || *cp == '\'') 1985 quote = *cp++; 1986 start = cp; 1987 if (quote) 1988 while (*cp && *cp != quote) 1989 cp++; 1990 else 1991 while (*cp && *cp != ' ' && *cp != '\t') 1992 cp++; 1993 if (*cp != '\0') 1994 *cp++ = '\0'; 1995 *cpp = cp; 1996 return (start); 1997 } 1998 1999 char * 2000 nextline(FILE *fd) 2001 { 2002 char *cp; 2003 2004 if (fgets(line, sizeof (line), fd) == NULL) 2005 return ((char *)0); 2006 cp = strchr(line, '\n'); 2007 if (cp) 2008 *cp = '\0'; 2009 return (line); 2010 } 2011 2012 char * 2013 newstr(const char *cp) 2014 { 2015 char *cr; 2016 2017 if ((cr = strdup(cp != NULL ? cp : ""))) 2018 return (cr); 2019 syslog(LOG_ERR, "strdup: %m"); 2020 exit(EX_OSERR); 2021 } 2022 2023 void 2024 inetd_setproctitle(const char *a, int s) 2025 { 2026 socklen_t size; 2027 struct sockaddr_storage ss; 2028 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2029 2030 size = sizeof(ss); 2031 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2032 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2033 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); 2034 sprintf(buf, "%s [%s]", a, pbuf); 2035 } else 2036 sprintf(buf, "%s", a); 2037 setproctitle("%s", buf); 2038 } 2039 2040 int 2041 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2042 { 2043 struct servtab *se2; 2044 char pname[INET6_ADDRSTRLEN]; 2045 2046 for (se2 = servtab; se2; se2 = se2->se_next) { 2047 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2048 continue; 2049 2050 switch (se2->se_family) { 2051 case AF_INET: 2052 if (((const struct sockaddr_in *)sa)->sin_port == 2053 se2->se_ctrladdr4.sin_port) 2054 goto isloop; 2055 continue; 2056 #ifdef INET6 2057 case AF_INET6: 2058 if (((const struct sockaddr_in *)sa)->sin_port == 2059 se2->se_ctrladdr4.sin_port) 2060 goto isloop; 2061 continue; 2062 #endif 2063 default: 2064 continue; 2065 } 2066 isloop: 2067 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2068 NI_NUMERICHOST|NI_WITHSCOPEID); 2069 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2070 sep->se_service, sep->se_proto, 2071 se2->se_service, se2->se_proto, 2072 pname); 2073 return 1; 2074 } 2075 return 0; 2076 } 2077 2078 /* 2079 * print_service: 2080 * Dump relevant information to stderr 2081 */ 2082 void 2083 print_service(const char *action, const struct servtab *sep) 2084 { 2085 fprintf(stderr, 2086 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2087 #ifdef LOGIN_CAP 2088 "class=%s" 2089 #endif 2090 " builtin=%p server=%s" 2091 #ifdef IPSEC 2092 " policy=\"%s\"" 2093 #endif 2094 "\n", 2095 action, sep->se_service, sep->se_proto, 2096 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2097 #ifdef LOGIN_CAP 2098 sep->se_class, 2099 #endif 2100 (void *) sep->se_bi, sep->se_server 2101 #ifdef IPSEC 2102 , (sep->se_policy ? sep->se_policy : "") 2103 #endif 2104 ); 2105 } 2106 2107 #define CPMHSIZE 256 2108 #define CPMHMASK (CPMHSIZE-1) 2109 #define CHTGRAN 10 2110 #define CHTSIZE 6 2111 2112 typedef struct CTime { 2113 unsigned long ct_Ticks; 2114 int ct_Count; 2115 } CTime; 2116 2117 typedef struct CHash { 2118 union { 2119 struct in_addr c4_Addr; 2120 struct in6_addr c6_Addr; 2121 } cu_Addr; 2122 #define ch_Addr4 cu_Addr.c4_Addr 2123 #define ch_Addr6 cu_Addr.c6_Addr 2124 int ch_Family; 2125 time_t ch_LTime; 2126 char *ch_Service; 2127 CTime ch_Times[CHTSIZE]; 2128 } CHash; 2129 2130 CHash CHashAry[CPMHSIZE]; 2131 2132 int 2133 cpmip(const struct servtab *sep, int ctrl) 2134 { 2135 struct sockaddr_storage rss; 2136 socklen_t rssLen = sizeof(rss); 2137 int r = 0; 2138 2139 /* 2140 * If getpeername() fails, just let it through (if logging is 2141 * enabled the condition is caught elsewhere) 2142 */ 2143 2144 if (sep->se_maxcpm > 0 && 2145 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2146 time_t t = time(NULL); 2147 int hv = 0xABC3D20F; 2148 int i; 2149 int cnt = 0; 2150 CHash *chBest = NULL; 2151 unsigned int ticks = t / CHTGRAN; 2152 struct sockaddr_in *sin4; 2153 #ifdef INET6 2154 struct sockaddr_in6 *sin6; 2155 #endif 2156 2157 sin4 = (struct sockaddr_in *)&rss; 2158 #ifdef INET6 2159 sin6 = (struct sockaddr_in6 *)&rss; 2160 #endif 2161 { 2162 char *p; 2163 int addrlen; 2164 2165 switch (rss.ss_family) { 2166 case AF_INET: 2167 p = (char *)&sin4->sin_addr; 2168 addrlen = sizeof(struct in_addr); 2169 break; 2170 #ifdef INET6 2171 case AF_INET6: 2172 p = (char *)&sin6->sin6_addr; 2173 addrlen = sizeof(struct in6_addr); 2174 break; 2175 #endif 2176 default: 2177 /* should not happen */ 2178 return -1; 2179 } 2180 2181 for (i = 0; i < addrlen; ++i, ++p) { 2182 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2183 } 2184 hv = (hv ^ (hv >> 16)); 2185 } 2186 for (i = 0; i < 5; ++i) { 2187 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2188 2189 if (rss.ss_family == AF_INET && 2190 ch->ch_Family == AF_INET && 2191 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2192 ch->ch_Service && strcmp(sep->se_service, 2193 ch->ch_Service) == 0) { 2194 chBest = ch; 2195 break; 2196 } 2197 #ifdef INET6 2198 if (rss.ss_family == AF_INET6 && 2199 ch->ch_Family == AF_INET6 && 2200 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2201 &ch->ch_Addr6) != 0 && 2202 ch->ch_Service && strcmp(sep->se_service, 2203 ch->ch_Service) == 0) { 2204 chBest = ch; 2205 break; 2206 } 2207 #endif 2208 if (chBest == NULL || ch->ch_LTime == 0 || 2209 ch->ch_LTime < chBest->ch_LTime) { 2210 chBest = ch; 2211 } 2212 } 2213 if ((rss.ss_family == AF_INET && 2214 (chBest->ch_Family != AF_INET || 2215 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2216 chBest->ch_Service == NULL || 2217 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2218 chBest->ch_Family = sin4->sin_family; 2219 chBest->ch_Addr4 = sin4->sin_addr; 2220 if (chBest->ch_Service) 2221 free(chBest->ch_Service); 2222 chBest->ch_Service = strdup(sep->se_service); 2223 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2224 } 2225 #ifdef INET6 2226 if ((rss.ss_family == AF_INET6 && 2227 (chBest->ch_Family != AF_INET6 || 2228 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2229 &chBest->ch_Addr6) == 0)) || 2230 chBest->ch_Service == NULL || 2231 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2232 chBest->ch_Family = sin6->sin6_family; 2233 chBest->ch_Addr6 = sin6->sin6_addr; 2234 if (chBest->ch_Service) 2235 free(chBest->ch_Service); 2236 chBest->ch_Service = strdup(sep->se_service); 2237 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2238 } 2239 #endif 2240 chBest->ch_LTime = t; 2241 { 2242 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2243 if (ct->ct_Ticks != ticks) { 2244 ct->ct_Ticks = ticks; 2245 ct->ct_Count = 0; 2246 } 2247 ++ct->ct_Count; 2248 } 2249 for (i = 0; i < CHTSIZE; ++i) { 2250 CTime *ct = &chBest->ch_Times[i]; 2251 if (ct->ct_Ticks <= ticks && 2252 ct->ct_Ticks >= ticks - CHTSIZE) { 2253 cnt += ct->ct_Count; 2254 } 2255 } 2256 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) { 2257 char pname[INET6_ADDRSTRLEN]; 2258 2259 getnameinfo((struct sockaddr *)&rss, 2260 ((struct sockaddr *)&rss)->sa_len, 2261 pname, sizeof(pname), NULL, 0, 2262 NI_NUMERICHOST|NI_WITHSCOPEID); 2263 r = -1; 2264 syslog(LOG_ERR, 2265 "%s from %s exceeded counts/min (limit %d/min)", 2266 sep->se_service, pname, 2267 sep->se_maxcpm); 2268 } 2269 } 2270 return(r); 2271 } 2272 2273 static struct conninfo * 2274 search_conn(struct servtab *sep, int ctrl) 2275 { 2276 struct sockaddr_storage ss; 2277 socklen_t sslen = sizeof(ss); 2278 struct conninfo *conn; 2279 int hv; 2280 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2281 2282 if (sep->se_maxperip <= 0) 2283 return NULL; 2284 2285 /* 2286 * If getpeername() fails, just let it through (if logging is 2287 * enabled the condition is caught elsewhere) 2288 */ 2289 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2290 return NULL; 2291 2292 switch (ss.ss_family) { 2293 case AF_INET: 2294 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2295 sizeof(struct in_addr)); 2296 break; 2297 #ifdef INET6 2298 case AF_INET6: 2299 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2300 sizeof(struct in6_addr)); 2301 break; 2302 #endif 2303 default: 2304 /* 2305 * Since we only support AF_INET and AF_INET6, just 2306 * let other than AF_INET and AF_INET6 through. 2307 */ 2308 return NULL; 2309 } 2310 2311 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2312 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 2313 return NULL; 2314 2315 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2316 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2317 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2318 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 && 2319 strcmp(pname, pname2) == 0) 2320 break; 2321 } 2322 2323 if (conn == NULL) { 2324 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2325 syslog(LOG_ERR, "malloc: %m"); 2326 exit(EX_OSERR); 2327 } 2328 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2329 if (conn->co_proc == NULL) { 2330 syslog(LOG_ERR, "malloc: %m"); 2331 exit(EX_OSERR); 2332 } 2333 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2334 conn->co_numchild = 0; 2335 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2336 } 2337 2338 /* 2339 * Since a child process is not invoked yet, we cannot 2340 * determine a pid of a child. So, co_proc and co_numchild 2341 * should be filled leter. 2342 */ 2343 2344 return conn; 2345 } 2346 2347 static int 2348 room_conn(struct servtab *sep, struct conninfo *conn) 2349 { 2350 char pname[NI_MAXHOST]; 2351 2352 if (conn->co_numchild >= sep->se_maxperip) { 2353 getnameinfo((struct sockaddr *)&conn->co_addr, 2354 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2355 NI_NUMERICHOST | NI_WITHSCOPEID); 2356 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2357 sep->se_service, pname, sep->se_maxperip); 2358 return 0; 2359 } 2360 return 1; 2361 } 2362 2363 static void 2364 addchild_conn(struct conninfo *conn, pid_t pid) 2365 { 2366 struct procinfo *proc; 2367 2368 if (conn == NULL) 2369 return; 2370 2371 if ((proc = search_proc(pid, 1)) != NULL) { 2372 if (proc->pr_conn != NULL) { 2373 syslog(LOG_ERR, 2374 "addchild_conn: child already on process list"); 2375 exit(EX_OSERR); 2376 } 2377 proc->pr_conn = conn; 2378 } 2379 2380 conn->co_proc[conn->co_numchild++] = proc; 2381 } 2382 2383 static void 2384 reapchild_conn(pid_t pid) 2385 { 2386 struct procinfo *proc; 2387 struct conninfo *conn; 2388 int i; 2389 2390 if ((proc = search_proc(pid, 0)) == NULL) 2391 return; 2392 if ((conn = proc->pr_conn) == NULL) 2393 return; 2394 for (i = 0; i < conn->co_numchild; ++i) 2395 if (conn->co_proc[i] == proc) { 2396 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2397 break; 2398 } 2399 free_proc(proc); 2400 free_conn(conn); 2401 } 2402 2403 static void 2404 resize_conn(struct servtab *sep, int maxpip) 2405 { 2406 struct conninfo *conn; 2407 int i, j; 2408 2409 if (sep->se_maxperip <= 0) 2410 return; 2411 if (maxpip <= 0) { 2412 free_connlist(sep); 2413 return; 2414 } 2415 for (i = 0; i < PERIPSIZE; ++i) { 2416 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2417 for (j = maxpip; j < conn->co_numchild; ++j) 2418 free_proc(conn->co_proc[j]); 2419 conn->co_proc = realloc(conn->co_proc, 2420 maxpip * sizeof(*conn->co_proc)); 2421 if (conn->co_proc == NULL) { 2422 syslog(LOG_ERR, "realloc: %m"); 2423 exit(EX_OSERR); 2424 } 2425 if (conn->co_numchild > maxpip) 2426 conn->co_numchild = maxpip; 2427 } 2428 } 2429 } 2430 2431 static void 2432 free_connlist(struct servtab *sep) 2433 { 2434 struct conninfo *conn; 2435 int i, j; 2436 2437 for (i = 0; i < PERIPSIZE; ++i) { 2438 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2439 for (j = 0; j < conn->co_numchild; ++j) 2440 free_proc(conn->co_proc[j]); 2441 conn->co_numchild = 0; 2442 free_conn(conn); 2443 } 2444 } 2445 } 2446 2447 static void 2448 free_conn(struct conninfo *conn) 2449 { 2450 if (conn == NULL) 2451 return; 2452 if (conn->co_numchild <= 0) { 2453 LIST_REMOVE(conn, co_link); 2454 free(conn->co_proc); 2455 free(conn); 2456 } 2457 } 2458 2459 static struct procinfo * 2460 search_proc(pid_t pid, int add) 2461 { 2462 struct procinfo *proc; 2463 int hv; 2464 2465 hv = hashval((char *)&pid, sizeof(pid)); 2466 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2467 if (proc->pr_pid == pid) 2468 break; 2469 } 2470 if (proc == NULL && add) { 2471 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2472 syslog(LOG_ERR, "malloc: %m"); 2473 exit(EX_OSERR); 2474 } 2475 proc->pr_pid = pid; 2476 proc->pr_conn = NULL; 2477 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2478 } 2479 return proc; 2480 } 2481 2482 static void 2483 free_proc(struct procinfo *proc) 2484 { 2485 if (proc == NULL) 2486 return; 2487 LIST_REMOVE(proc, pr_link); 2488 free(proc); 2489 } 2490 2491 static int 2492 hashval(char *p, int len) 2493 { 2494 int i, hv = 0xABC3D20F; 2495 2496 for (i = 0; i < len; ++i, ++p) 2497 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2498 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2499 return hv; 2500 } 2501