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