1 /* $OpenBSD: authpf.c,v 1.66 2003/07/11 08:29:34 cedric Exp $ */ 2 3 /* 4 * Copyright (C) 1998 - 2002 Bob Beck (beck@openbsd.org). 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/types.h> 29 #include <sys/file.h> 30 #include <sys/ioctl.h> 31 #include <sys/socket.h> 32 #include <sys/time.h> 33 34 #include <net/if.h> 35 #include <net/pfvar.h> 36 #include <arpa/inet.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <pwd.h> 41 #include <signal.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <syslog.h> 46 #include <unistd.h> 47 48 #include <pfctl_parser.h> 49 50 #include "pathnames.h" 51 52 extern int symset(const char *, const char *, int); 53 54 static int read_config(FILE *); 55 static void print_message(char *); 56 static int allowed_luser(char *); 57 static int check_luser(char *, char *); 58 static int remove_stale_rulesets(void); 59 static int change_filter(int, const char *, const char *); 60 static void authpf_kill_states(void); 61 62 int dev; /* pf device */ 63 char anchorname[PF_ANCHOR_NAME_SIZE] = "authpf"; 64 char rulesetname[PF_RULESET_NAME_SIZE]; 65 66 FILE *pidfp; 67 char *infile; /* file name printed by yyerror() in parse.y */ 68 char luser[MAXLOGNAME]; /* username */ 69 char ipsrc[256]; /* ip as a string */ 70 char pidfile[MAXPATHLEN]; /* we save pid in this file. */ 71 72 struct timeval Tstart, Tend; /* start and end times of session */ 73 74 volatile sig_atomic_t want_death; 75 static void need_death(int signo); 76 static __dead void do_death(int); 77 78 /* 79 * User shell for authenticating gateways. Sole purpose is to allow 80 * a user to ssh to a gateway, and have the gateway modify packet 81 * filters to allow access, then remove access when the user finishes 82 * up. Meant to be used only from ssh(1) connections. 83 */ 84 int 85 main(int argc, char *argv[]) 86 { 87 int lockcnt = 0, n, pidfd; 88 FILE *config; 89 struct in_addr ina; 90 struct passwd *pw; 91 char *cp; 92 uid_t uid; 93 94 if ((n = snprintf(rulesetname, sizeof(rulesetname), "%ld", 95 (long)getpid())) < 0 || n >= sizeof(rulesetname)) { 96 syslog(LOG_ERR, "pid too large for ruleset name"); 97 exit(1); 98 } 99 100 config = fopen(PATH_CONFFILE, "r"); 101 102 if ((cp = getenv("SSH_TTY")) == NULL) { 103 syslog(LOG_ERR, "non-interactive session connection for authpf"); 104 exit(1); 105 } 106 107 if ((cp = getenv("SSH_CLIENT")) == NULL) { 108 syslog(LOG_ERR, "cannot determine connection source"); 109 exit(1); 110 } 111 112 if (strlcpy(ipsrc, cp, sizeof(ipsrc)) >= sizeof(ipsrc)) { 113 syslog(LOG_ERR, "SSH_CLIENT variable too long"); 114 exit(1); 115 } 116 cp = strchr(ipsrc, ' '); 117 if (!cp) { 118 syslog(LOG_ERR, "corrupt SSH_CLIENT variable %s", ipsrc); 119 exit(1); 120 } 121 *cp = '\0'; 122 if (inet_pton(AF_INET, ipsrc, &ina) != 1) { 123 syslog(LOG_ERR, 124 "cannot determine IP from SSH_CLIENT %s", ipsrc); 125 exit(1); 126 } 127 128 /* open the pf device */ 129 dev = open(PATH_DEVFILE, O_RDWR); 130 if (dev == -1) { 131 syslog(LOG_ERR, "cannot open packet filter device (%m)"); 132 goto die; 133 } 134 135 uid = getuid(); 136 pw = getpwuid(uid); 137 if (pw == NULL) { 138 syslog(LOG_ERR, "cannot find user for uid %u", uid); 139 goto die; 140 } 141 if (strcmp(pw->pw_shell, PATH_AUTHPF_SHELL)) { 142 syslog(LOG_ERR, "wrong shell for user %s, uid %u", 143 pw->pw_name, pw->pw_uid); 144 goto die; 145 } 146 147 /* 148 * Paranoia, but this data _does_ come from outside authpf, and 149 * truncation would be bad. 150 */ 151 if (strlcpy(luser, pw->pw_name, sizeof(luser)) >= sizeof(luser)) { 152 syslog(LOG_ERR, "username too long: %s", pw->pw_name); 153 goto die; 154 } 155 156 /* Make our entry in /var/authpf as /var/authpf/ipaddr */ 157 n = snprintf(pidfile, sizeof(pidfile), "%s/%s", PATH_PIDFILE, ipsrc); 158 if (n < 0 || (u_int)n >= sizeof(pidfile)) { 159 syslog(LOG_ERR, "path to pidfile too long"); 160 goto die; 161 } 162 163 /* 164 * If someone else is already using this ip, then this person 165 * wants to switch users - so kill the old process and exit 166 * as well. 167 * 168 * Note, we could print a message and tell them to log out, but the 169 * usual case of this is that someone has left themselves logged in, 170 * with the authenticated connection iconized and someone else walks 171 * up to use and automatically logs in before using. If this just 172 * gets rid of the old one silently, the new user never knows they 173 * could have used someone else's old authentication. If we 174 * tell them to log out before switching users it is an invitation 175 * for abuse. 176 */ 177 178 do { 179 int save_errno, otherpid = -1; 180 char otherluser[MAXLOGNAME]; 181 182 if ((pidfd = open(pidfile, O_RDWR|O_CREAT, 0644)) == -1 || 183 (pidfp = fdopen(pidfd, "r+")) == NULL) { 184 if (pidfd != -1) 185 close(pidfd); 186 syslog(LOG_ERR, "cannot open or create %s: %s", pidfile, 187 strerror(errno)); 188 goto die; 189 } 190 191 if (flock(fileno(pidfp), LOCK_EX|LOCK_NB) == 0) 192 break; 193 save_errno = errno; 194 195 /* Mark our pid, and username to our file. */ 196 197 rewind(pidfp); 198 /* 31 == MAXLOGNAME - 1 */ 199 if (fscanf(pidfp, "%d\n%31s\n", &otherpid, otherluser) != 2) 200 otherpid = -1; 201 syslog(LOG_DEBUG, "tried to lock %s, in use by pid %d: %s", 202 pidfile, otherpid, strerror(save_errno)); 203 204 if (otherpid > 0) { 205 syslog(LOG_INFO, 206 "killing prior auth (pid %d) of %s by user %s", 207 otherpid, ipsrc, otherluser); 208 if (kill((pid_t) otherpid, SIGTERM) == -1) { 209 syslog(LOG_INFO, 210 "could not kill process %d: (%m)", 211 otherpid); 212 } 213 } 214 215 /* 216 * we try to kill the previous process and acquire the lock 217 * for 10 seconds, trying once a second. if we can't after 218 * 10 attempts we log an error and give up 219 */ 220 if (++lockcnt > 10) { 221 syslog(LOG_ERR, "cannot kill previous authpf (pid %d)", 222 otherpid); 223 goto dogdeath; 224 } 225 sleep(1); 226 227 /* re-open, and try again. The previous authpf process 228 * we killed above should unlink the file and release 229 * it's lock, giving us a chance to get it now 230 */ 231 fclose(pidfp); 232 } while (1); 233 234 /* revoke privs */ 235 seteuid(getuid()); 236 setuid(getuid()); 237 238 if (!check_luser(PATH_BAN_DIR, luser) || !allowed_luser(luser)) 239 do_death(0); 240 241 openlog("authpf", LOG_PID | LOG_NDELAY, LOG_DAEMON); 242 if (config == NULL || read_config(config)) 243 do_death(0); 244 245 if (remove_stale_rulesets()) 246 do_death(0); 247 248 /* We appear to be making headway, so actually mark our pid */ 249 rewind(pidfp); 250 fprintf(pidfp, "%ld\n%s\n", (long)getpid(), luser); 251 fflush(pidfp); 252 (void) ftruncate(fileno(pidfp), ftell(pidfp)); 253 254 if (change_filter(1, luser, ipsrc) == -1) { 255 printf("Unable to modify filters\r\n"); 256 do_death(1); 257 } 258 259 signal(SIGTERM, need_death); 260 signal(SIGINT, need_death); 261 signal(SIGALRM, need_death); 262 signal(SIGPIPE, need_death); 263 signal(SIGHUP, need_death); 264 signal(SIGSTOP, need_death); 265 signal(SIGTSTP, need_death); 266 while (1) { 267 printf("\r\nHello %s, ", luser); 268 printf("You are authenticated from host \"%s\"\r\n", ipsrc); 269 setproctitle("%s@%s", luser, ipsrc); 270 print_message(PATH_MESSAGE); 271 while (1) { 272 sleep(10); 273 if (want_death) 274 do_death(1); 275 } 276 } 277 278 /* NOTREACHED */ 279 dogdeath: 280 printf("\r\n\r\nSorry, this service is currently unavailable due to "); 281 printf("technical difficulties\r\n\r\n"); 282 print_message(PATH_PROBLEM); 283 printf("\r\nYour authentication process (pid %ld) was unable to run\n", 284 (long)getpid()); 285 sleep(180); /* them lusers read reaaaaal slow */ 286 die: 287 do_death(0); 288 } 289 290 /* 291 * reads config file in PATH_CONFFILE to set optional behaviours up 292 */ 293 static int 294 read_config(FILE *f) 295 { 296 char buf[1024]; 297 int i = 0; 298 299 do { 300 char **ap; 301 char *pair[4], *cp, *tp; 302 int len; 303 304 if (fgets(buf, sizeof(buf), f) == NULL) { 305 fclose(f); 306 return (0); 307 } 308 i++; 309 len = strlen(buf); 310 if (buf[len - 1] != '\n' && !feof(f)) { 311 syslog(LOG_ERR, "line %d too long in %s", i, 312 PATH_CONFFILE); 313 return (1); 314 } 315 buf[len - 1] = '\0'; 316 317 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) 318 ; /* nothing */ 319 320 if (!*cp || *cp == '#' || *cp == '\n') 321 continue; 322 323 for (ap = pair; ap < &pair[3] && 324 (*ap = strsep(&cp, "=")) != NULL; ) { 325 if (**ap != '\0') 326 ap++; 327 } 328 if (ap != &pair[2]) 329 goto parse_error; 330 331 tp = pair[1] + strlen(pair[1]); 332 while ((*tp == ' ' || *tp == '\t') && tp >= pair[1]) 333 *tp-- = '\0'; 334 335 if (strcasecmp(pair[0], "anchor") == 0) { 336 if (!pair[1][0] || strlcpy(anchorname, pair[1], 337 sizeof(anchorname)) >= sizeof(anchorname)) 338 goto parse_error; 339 } 340 } while (!feof(f) && !ferror(f)); 341 fclose(f); 342 return (0); 343 344 parse_error: 345 fclose(f); 346 syslog(LOG_ERR, "parse error, line %d of %s", i, PATH_CONFFILE); 347 return (1); 348 } 349 350 351 /* 352 * splatter a file to stdout - max line length of 1024, 353 * used for spitting message files at users to tell them 354 * they've been bad or we're unavailable. 355 */ 356 static void 357 print_message(char *filename) 358 { 359 char buf[1024]; 360 FILE *f; 361 362 if ((f = fopen(filename, "r")) == NULL) 363 return; /* fail silently, we don't care if it isn't there */ 364 365 do { 366 if (fgets(buf, sizeof(buf), f) == NULL) { 367 fflush(stdout); 368 fclose(f); 369 return; 370 } 371 } while (fputs(buf, stdout) != EOF && !feof(f)); 372 fflush(stdout); 373 fclose(f); 374 } 375 376 /* 377 * allowed_luser checks to see if user "luser" is allowed to 378 * use this gateway by virtue of being listed in an allowed 379 * users file, namely /etc/authpf/authpf.allow . 380 * 381 * If /etc/authpf/authpf.allow does not exist, then we assume that 382 * all users who are allowed in by sshd(8) are permitted to 383 * use this gateway. If /etc/authpf/authpf.allow does exist, then a 384 * user must be listed if the connection is to continue, else 385 * the session terminates in the same manner as being banned. 386 */ 387 static int 388 allowed_luser(char *luser) 389 { 390 char *buf, *lbuf; 391 int matched; 392 size_t len; 393 FILE *f; 394 395 if ((f = fopen(PATH_ALLOWFILE, "r")) == NULL) { 396 if (errno == ENOENT) { 397 /* 398 * allowfile doesn't exist, thus this gateway 399 * isn't restricted to certain users... 400 */ 401 return (1); 402 } 403 404 /* 405 * luser may in fact be allowed, but we can't open 406 * the file even though it's there. probably a config 407 * problem. 408 */ 409 syslog(LOG_ERR, "cannot open allowed users file %s (%s)", 410 PATH_ALLOWFILE, strerror(errno)); 411 return (0); 412 } else { 413 /* 414 * /etc/authpf/authpf.allow exists, thus we do a linear 415 * search to see if they are allowed. 416 * also, if username "*" exists, then this is a 417 * "public" gateway, such as it is, so let 418 * everyone use it. 419 */ 420 lbuf = NULL; 421 while ((buf = fgetln(f, &len))) { 422 if (buf[len - 1] == '\n') 423 buf[len - 1] = '\0'; 424 else { 425 if ((lbuf = (char *)malloc(len + 1)) == NULL) 426 err(1, NULL); 427 memcpy(lbuf, buf, len); 428 lbuf[len] = '\0'; 429 buf = lbuf; 430 } 431 432 matched = strcmp(luser, buf) == 0 || strcmp("*", buf) == 0; 433 434 if (lbuf != NULL) { 435 free(lbuf); 436 lbuf = NULL; 437 } 438 439 if (matched) 440 return (1); /* matched an allowed username */ 441 } 442 syslog(LOG_INFO, "denied access to %s: not listed in %s", 443 luser, PATH_ALLOWFILE); 444 445 /* reuse buf */ 446 buf = "\n\nSorry, you are not allowed to use this facility!\n"; 447 fputs(buf, stdout); 448 } 449 fflush(stdout); 450 return (0); 451 } 452 453 /* 454 * check_luser checks to see if user "luser" has been banned 455 * from using us by virtue of having an file of the same name 456 * in the "luserdir" directory. 457 * 458 * If the user has been banned, we copy the contents of the file 459 * to the user's screen. (useful for telling the user what to 460 * do to get un-banned, or just to tell them they aren't 461 * going to be un-banned.) 462 */ 463 static int 464 check_luser(char *luserdir, char *luser) 465 { 466 FILE *f; 467 int n; 468 char tmp[MAXPATHLEN]; 469 470 n = snprintf(tmp, sizeof(tmp), "%s/%s", luserdir, luser); 471 if (n < 0 || (u_int)n >= sizeof(tmp)) { 472 syslog(LOG_ERR, "provided banned directory line too long (%s)", 473 luserdir); 474 return (0); 475 } 476 if ((f = fopen(tmp, "r")) == NULL) { 477 if (errno == ENOENT) { 478 /* 479 * file or dir doesn't exist, so therefore 480 * this luser isn't banned.. all is well 481 */ 482 return (1); 483 } else { 484 /* 485 * luser may in fact be banned, but we can't open the 486 * file even though it's there. probably a config 487 * problem. 488 */ 489 syslog(LOG_ERR, "cannot open banned file %s (%s)", 490 tmp, strerror(errno)); 491 return (0); 492 } 493 } else { 494 /* 495 * luser is banned - spit the file at them to 496 * tell what they can do and where they can go. 497 */ 498 syslog(LOG_INFO, "denied access to %s: %s exists", 499 luser, tmp); 500 501 /* reuse tmp */ 502 strlcpy(tmp, "\n\n-**- Sorry, you have been banned! -**-\n\n", 503 sizeof(tmp)); 504 while (fputs(tmp, stdout) != EOF && !feof(f)) { 505 if (fgets(tmp, sizeof(tmp), f) == NULL) { 506 fflush(stdout); 507 return (0); 508 } 509 } 510 } 511 fflush(stdout); 512 return (0); 513 } 514 515 /* 516 * Search for rulesets left by other authpf processes (either because they 517 * died ungracefully or were terminated) and remove them. 518 */ 519 static int 520 remove_stale_rulesets(void) 521 { 522 struct pfioc_ruleset prs; 523 const int action[PF_RULESET_MAX] = { PF_SCRUB, 524 PF_PASS, PF_NAT, PF_BINAT, PF_RDR }; 525 u_int32_t nr, mnr; 526 527 memset(&prs, 0, sizeof(prs)); 528 strlcpy(prs.anchor, anchorname, sizeof(prs.anchor)); 529 if (ioctl(dev, DIOCGETRULESETS, &prs)) { 530 if (errno == EINVAL) 531 return (0); 532 else 533 return (1); 534 } 535 536 mnr = prs.nr; 537 nr = 0; 538 while (nr < mnr) { 539 char *s; 540 pid_t pid; 541 542 prs.nr = nr; 543 if (ioctl(dev, DIOCGETRULESET, &prs)) 544 return (1); 545 errno = 0; 546 pid = strtoul(prs.name, &s, 10); 547 if (!prs.name[0] || errno || *s) 548 return (1); 549 if (kill(pid, 0) && errno != EPERM) { 550 int i; 551 552 for (i = 0; i < PF_RULESET_MAX; ++i) { 553 struct pfioc_rule pr; 554 555 memset(&pr, 0, sizeof(pr)); 556 memcpy(pr.anchor, prs.anchor, sizeof(pr.anchor)); 557 memcpy(pr.ruleset, prs.name, sizeof(pr.ruleset)); 558 pr.rule.action = action[i]; 559 if ((ioctl(dev, DIOCBEGINRULES, &pr) || 560 ioctl(dev, DIOCCOMMITRULES, &pr)) && 561 errno != EINVAL) 562 return (1); 563 } 564 mnr--; 565 } else 566 nr++; 567 } 568 return (0); 569 } 570 571 /* 572 * Add/remove filter entries for user "luser" from ip "ipsrc" 573 */ 574 static int 575 change_filter(int add, const char *luser, const char *ipsrc) 576 { 577 char fn[MAXPATHLEN]; 578 FILE *f = NULL; 579 const int action[PF_RULESET_MAX] = { PF_SCRUB, 580 PF_PASS, PF_NAT, PF_BINAT, PF_RDR }; 581 struct pfctl pf; 582 struct pfioc_rule pr[PF_RULESET_MAX]; 583 int i; 584 585 if (luser == NULL || !luser[0] || strlen(luser) >= 586 PF_RULESET_NAME_SIZE || ipsrc == NULL || !ipsrc[0]) { 587 syslog(LOG_ERR, "invalid luser/ipsrc"); 588 goto error; 589 } 590 591 if (add) { 592 if ((i = snprintf(fn, sizeof(fn), "%s/%s/authpf.rules", 593 PATH_USER_DIR, luser)) < 0 || i >= sizeof(fn)) { 594 syslog(LOG_ERR, "user rule path too long"); 595 goto error; 596 } 597 if ((f = fopen(fn, "r")) == NULL && errno != ENOENT) { 598 syslog(LOG_ERR, "cannot open %s (%m)", fn); 599 goto error; 600 } 601 if (f == NULL) { 602 if (strlcpy(fn, PATH_PFRULES, sizeof(fn)) >= 603 sizeof(fn)) { 604 syslog(LOG_ERR, "rule path too long"); 605 goto error; 606 } 607 if ((f = fopen(fn, "r")) == NULL) { 608 syslog(LOG_ERR, "cannot open %s (%m)", fn); 609 goto error; 610 } 611 } 612 } 613 614 memset(&pf, 0, sizeof(pf)); 615 for (i = 0; i < PF_RULESET_MAX; ++i) { 616 memset(&pr[i], 0, sizeof(pr[i])); 617 pr[i].rule.action = action[i]; 618 strlcpy(pr[i].anchor, anchorname, sizeof(pr[i].anchor)); 619 strlcpy(pr[i].ruleset, rulesetname, sizeof(pr[i].ruleset)); 620 if (ioctl(dev, DIOCBEGINRULES, &pr[i])) { 621 syslog(LOG_ERR, "DIOCBEGINRULES %m"); 622 goto error; 623 } 624 pf.prule[i] = &pr[i]; 625 } 626 627 if (add) { 628 if (symset("user_ip", ipsrc, 0) || 629 symset("user_id", luser, 0)) { 630 syslog(LOG_ERR, "symset"); 631 goto error; 632 } 633 634 pf.dev = dev; 635 infile = fn; 636 if (parse_rules(f, &pf) < 0) { 637 syslog(LOG_ERR, "syntax error in rule file: " 638 "authpf rules not loaded"); 639 goto error; 640 } 641 642 infile = NULL; 643 fclose(f); 644 f = NULL; 645 } 646 647 for (i = 0; i < PF_RULESET_MAX; ++i) 648 /* 649 * ignore EINVAL on removal, it means the anchor was 650 * already automatically removed by the kernel. 651 */ 652 if (ioctl(dev, DIOCCOMMITRULES, &pr[i]) && 653 (add || errno != EINVAL)) { 654 syslog(LOG_ERR, "DIOCCOMMITRULES %m"); 655 goto error; 656 } 657 658 if (add) { 659 gettimeofday(&Tstart, NULL); 660 syslog(LOG_INFO, "allowing %s, user %s", ipsrc, luser); 661 } else { 662 gettimeofday(&Tend, NULL); 663 syslog(LOG_INFO, "removed %s, user %s - duration %ld seconds", 664 ipsrc, luser, Tend.tv_sec - Tstart.tv_sec); 665 } 666 return (0); 667 668 error: 669 if (f != NULL) 670 fclose(f); 671 672 infile = NULL; 673 return (-1); 674 } 675 676 /* 677 * This is to kill off states that would otherwise be left behind stateful 678 * rules. This means we don't need to allow in more traffic than we really 679 * want to, since we don't have to worry about any luser sessions lasting 680 * longer than their ssh session. This function is based on 681 * pfctl_kill_states from pfctl. 682 */ 683 static void 684 authpf_kill_states(void) 685 { 686 struct pfioc_state_kill psk; 687 struct in_addr target; 688 689 memset(&psk, 0, sizeof(psk)); 690 psk.psk_af = AF_INET; 691 692 inet_pton(AF_INET, ipsrc, &target); 693 694 /* Kill all states from ipsrc */ 695 psk.psk_src.addr.v.a.addr.v4 = target; 696 memset(&psk.psk_src.addr.v.a.mask, 0xff, 697 sizeof(psk.psk_src.addr.v.a.mask)); 698 if (ioctl(dev, DIOCKILLSTATES, &psk)) 699 syslog(LOG_ERR, "DIOCKILLSTATES failed (%m)"); 700 701 /* Kill all states to ipsrc */ 702 psk.psk_af = AF_INET; 703 memset(&psk.psk_src, 0, sizeof(psk.psk_src)); 704 psk.psk_dst.addr.v.a.addr.v4 = target; 705 memset(&psk.psk_dst.addr.v.a.mask, 0xff, 706 sizeof(psk.psk_dst.addr.v.a.mask)); 707 if (ioctl(dev, DIOCKILLSTATES, &psk)) 708 syslog(LOG_ERR, "DIOCKILLSTATES failed (%m)"); 709 } 710 711 /* signal handler that makes us go away properly */ 712 static void 713 need_death(int signo) 714 { 715 want_death = 1; 716 } 717 718 /* 719 * function that removes our stuff when we go away. 720 */ 721 static __dead void 722 do_death(int active) 723 { 724 int ret = 0; 725 726 if (active) { 727 change_filter(0, luser, ipsrc); 728 authpf_kill_states(); 729 remove_stale_rulesets(); 730 } 731 if (pidfp) 732 ftruncate(fileno(pidfp), 0); 733 if (pidfile[0]) 734 if (unlink(pidfile) == -1) 735 syslog(LOG_ERR, "cannot unlink %s (%m)", pidfile); 736 exit(ret); 737 } 738 739 /* 740 * callbacks for parse_rules(void) 741 */ 742 743 int 744 pfctl_add_rule(struct pfctl *pf, struct pf_rule *r) 745 { 746 struct pfioc_rule *pr; 747 748 switch (r->action) { 749 case PF_PASS: 750 case PF_DROP: 751 pr = pf->prule[PF_RULESET_FILTER]; 752 break; 753 case PF_SCRUB: 754 pr = pf->prule[PF_RULESET_SCRUB]; 755 break; 756 case PF_NAT: 757 case PF_NONAT: 758 pr = pf->prule[PF_RULESET_NAT]; 759 break; 760 case PF_RDR: 761 case PF_NORDR: 762 pr = pf->prule[PF_RULESET_RDR]; 763 break; 764 case PF_BINAT: 765 case PF_NOBINAT: 766 pr = pf->prule[PF_RULESET_BINAT]; 767 break; 768 default: 769 syslog(LOG_ERR, "invalid rule action %d", r->action); 770 return (1); 771 } 772 if (pfctl_add_pool(pf, &r->rpool, r->af)) 773 return (1); 774 pr->pool_ticket = pf->paddr.ticket; 775 memcpy(&pr->rule, r, sizeof(pr->rule)); 776 if (ioctl(pf->dev, DIOCADDRULE, pr)) { 777 syslog(LOG_ERR, "DIOCADDRULE %m"); 778 return (1); 779 } 780 pfctl_clear_pool(&r->rpool); 781 return (0); 782 } 783 784 int 785 pfctl_add_pool(struct pfctl *pf, struct pf_pool *p, sa_family_t af) 786 { 787 struct pf_pooladdr *pa; 788 789 if (ioctl(pf->dev, DIOCBEGINADDRS, &pf->paddr)) { 790 syslog(LOG_ERR, "DIOCBEGINADDRS %m"); 791 return (1); 792 } 793 pf->paddr.af = af; 794 TAILQ_FOREACH(pa, &p->list, entries) { 795 memcpy(&pf->paddr.addr, pa, sizeof(struct pf_pooladdr)); 796 if (ioctl(pf->dev, DIOCADDADDR, &pf->paddr)) { 797 syslog(LOG_ERR, "DIOCADDADDR %m"); 798 return (1); 799 } 800 } 801 return (0); 802 } 803 804 void 805 pfctl_clear_pool(struct pf_pool *pool) 806 { 807 struct pf_pooladdr *pa; 808 809 while ((pa = TAILQ_FIRST(&pool->list)) != NULL) { 810 TAILQ_REMOVE(&pool->list, pa, entries); 811 free(pa); 812 } 813 } 814 815 int 816 pfctl_add_altq(struct pfctl *pf, struct pf_altq *a) 817 { 818 fprintf(stderr, "altq rules not supported in authpf\n"); 819 return (1); 820 } 821 822 int 823 pfctl_set_optimization(struct pfctl *pf, const char *opt) 824 { 825 fprintf(stderr, "set optimization not supported in authpf\n"); 826 return (1); 827 } 828 829 int 830 pfctl_set_logif(struct pfctl *pf, char *ifname) 831 { 832 fprintf(stderr, "set loginterface not supported in authpf\n"); 833 return (1); 834 } 835 836 int 837 pfctl_set_timeout(struct pfctl *pf, const char *opt, int seconds, int quiet) 838 { 839 fprintf(stderr, "set timeout not supported in authpf\n"); 840 return (1); 841 } 842 843 int 844 pfctl_set_limit(struct pfctl *pf, const char *opt, unsigned int limit) 845 { 846 fprintf(stderr, "set limit not supported in authpf\n"); 847 return (1); 848 } 849 850 int 851 pfctl_define_table(char *name, int flags, int addrs, const char *anchor, 852 const char *ruleset, struct pfr_buffer *ab, int ticket) 853 { 854 fprintf(stderr, "table definitions not yet supported in authpf\n"); 855 return (1); 856 } 857 858 int 859 pfctl_rules(int dev, char *filename, int opts, char *anchorname, 860 char *rulesetname) 861 { 862 /* never called, no anchors inside anchors, but we need the stub */ 863 fprintf(stderr, "load anchor not supported from authpf\n"); 864 return (1); 865 } 866