Merge branch 'vendor/LIBARCHIVE'
[dragonfly.git] / usr.sbin / authpf / authpf.c
CommitLineData
95cc27f0 1/* $OpenBSD: authpf.c,v 1.75 2004/01/29 01:55:10 deraadt Exp $ */
71126e33 2/* $DragonFly: src/usr.sbin/authpf/authpf.c,v 1.2 2004/12/18 22:48:02 swildner Exp $ */
95cc27f0
JS
3
4/*
5 * Copyright (C) 1998 - 2002 Bob Beck (beck@openbsd.org).
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/param.h>
30#include <sys/types.h>
31#include <sys/file.h>
32#include <sys/ioctl.h>
33#include <sys/socket.h>
34#include <sys/time.h>
35
36#include <net/if.h>
37#include <net/pf/pfvar.h>
38#include <arpa/inet.h>
39
40#include <err.h>
41#include <errno.h>
42#include <pwd.h>
43#include <signal.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <syslog.h>
48#include <unistd.h>
49
50#include "pfctl_parser.h"
51#include "pfctl.h"
52
53#include "pathnames.h"
54
55#define __dead __dead2
56
57extern int symset(const char *, const char *, int);
58
59static int read_config(FILE *);
60static void print_message(const char *);
61static int allowed_luser(const char *);
62static int check_luser(const char *, const char *);
63static int remove_stale_rulesets(void);
64static int change_filter(int, const char *, const char *);
65static void authpf_kill_states(void);
66
67int dev_fd; /* pf device */
68char anchorname[PF_ANCHOR_NAME_SIZE] = "authpf";
69char rulesetname[PF_RULESET_NAME_SIZE];
70
71FILE *pidfp;
72char *infile; /* file name printed by yyerror() in parse.y */
73char luser[MAXLOGNAME]; /* username */
74char ipsrc[256]; /* ip as a string */
75char pidfile[MAXPATHLEN]; /* we save pid in this file. */
76
77struct timeval Tstart, Tend; /* start and end times of session */
78
79volatile sig_atomic_t want_death;
80static void need_death(int signo);
81static __dead void do_death(int);
82
83/*
84 * User shell for authenticating gateways. Sole purpose is to allow
85 * a user to ssh to a gateway, and have the gateway modify packet
86 * filters to allow access, then remove access when the user finishes
87 * up. Meant to be used only from ssh(1) connections.
88 */
89int
90main(int argc __unused, char **argv __unused)
91{
92 int lockcnt = 0, n, pidfd;
93 FILE *config;
94 struct in_addr ina;
95 struct passwd *pw;
96 char *cp;
97 uid_t uid;
98
99 config = fopen(PATH_CONFFILE, "r");
100
101 if ((cp = getenv("SSH_TTY")) == NULL) {
102 syslog(LOG_ERR, "non-interactive session connection for authpf");
103 exit(1);
104 }
105
106 if ((cp = getenv("SSH_CLIENT")) == NULL) {
107 syslog(LOG_ERR, "cannot determine connection source");
108 exit(1);
109 }
110
111 if (strlcpy(ipsrc, cp, sizeof(ipsrc)) >= sizeof(ipsrc)) {
112 syslog(LOG_ERR, "SSH_CLIENT variable too long");
113 exit(1);
114 }
115 cp = strchr(ipsrc, ' ');
116 if (!cp) {
117 syslog(LOG_ERR, "corrupt SSH_CLIENT variable %s", ipsrc);
118 exit(1);
119 }
120 *cp = '\0';
121 if (inet_pton(AF_INET, ipsrc, &ina) != 1) {
122 syslog(LOG_ERR,
123 "cannot determine IP from SSH_CLIENT %s", ipsrc);
124 exit(1);
125 }
126 /* open the pf device */
127 dev_fd = open(PATH_DEVFILE, O_RDWR);
128 if (dev_fd == -1) {
129 syslog(LOG_ERR, "cannot open packet filter device (%m)");
130 goto die;
131 }
132
133 uid = getuid();
134 pw = getpwuid(uid);
135 if (pw == NULL) {
136 syslog(LOG_ERR, "cannot find user for uid %u", uid);
137 goto die;
138 }
139 if (strcmp(pw->pw_shell, PATH_AUTHPF_SHELL)) {
140 syslog(LOG_ERR, "wrong shell for user %s, uid %u",
141 pw->pw_name, pw->pw_uid);
142 goto die;
143 }
144
145 /*
146 * Paranoia, but this data _does_ come from outside authpf, and
147 * truncation would be bad.
148 */
149 if (strlcpy(luser, pw->pw_name, sizeof(luser)) >= sizeof(luser)) {
150 syslog(LOG_ERR, "username too long: %s", pw->pw_name);
151 goto die;
152 }
153
154 if ((n = snprintf(rulesetname, sizeof(rulesetname), "%s(%ld)",
155 luser, (long)getpid())) < 0 || n >= (int)sizeof(rulesetname)) {
156 syslog(LOG_INFO, "%s(%ld) too large, ruleset name will be %ld",
157 luser, (long)getpid(), (long)getpid());
158 if ((n = snprintf(rulesetname, sizeof(rulesetname), "%ld",
159 (long)getpid())) < 0 || n >= (int)sizeof(rulesetname)) {
160 syslog(LOG_ERR, "pid too large for ruleset name");
161 goto die;
162 }
163 }
164
165
166 /* Make our entry in /var/authpf as /var/authpf/ipaddr */
167 n = snprintf(pidfile, sizeof(pidfile), "%s/%s", PATH_PIDFILE, ipsrc);
168 if (n < 0 || (u_int)n >= sizeof(pidfile)) {
169 syslog(LOG_ERR, "path to pidfile too long");
170 goto die;
171 }
172
173 /*
174 * If someone else is already using this ip, then this person
175 * wants to switch users - so kill the old process and exit
176 * as well.
177 *
178 * Note, we could print a message and tell them to log out, but the
179 * usual case of this is that someone has left themselves logged in,
180 * with the authenticated connection iconized and someone else walks
181 * up to use and automatically logs in before using. If this just
182 * gets rid of the old one silently, the new user never knows they
183 * could have used someone else's old authentication. If we
184 * tell them to log out before switching users it is an invitation
185 * for abuse.
186 */
187
188 do {
189 int save_errno, otherpid = -1;
190 char otherluser[MAXLOGNAME];
191
192 if ((pidfd = open(pidfile, O_RDWR|O_CREAT, 0644)) == -1 ||
193 (pidfp = fdopen(pidfd, "r+")) == NULL) {
194 if (pidfd != -1)
195 close(pidfd);
196 syslog(LOG_ERR, "cannot open or create %s: %s", pidfile,
197 strerror(errno));
198 goto die;
199 }
200
201 if (flock(fileno(pidfp), LOCK_EX|LOCK_NB) == 0)
202 break;
203 save_errno = errno;
204
205 /* Mark our pid, and username to our file. */
206
207 rewind(pidfp);
208 /* 31 == MAXLOGNAME - 1 */
209 if (fscanf(pidfp, "%d\n%31s\n", &otherpid, otherluser) != 2)
210 otherpid = -1;
211 syslog(LOG_DEBUG, "tried to lock %s, in use by pid %d: %s",
212 pidfile, otherpid, strerror(save_errno));
213
214 if (otherpid > 0) {
215 syslog(LOG_INFO,
216 "killing prior auth (pid %d) of %s by user %s",
217 otherpid, ipsrc, otherluser);
218 if (kill((pid_t) otherpid, SIGTERM) == -1) {
219 syslog(LOG_INFO,
220 "could not kill process %d: (%m)",
221 otherpid);
222 }
223 }
224
225 /*
226 * we try to kill the previous process and acquire the lock
227 * for 10 seconds, trying once a second. if we can't after
228 * 10 attempts we log an error and give up
229 */
230 if (++lockcnt > 10) {
231 syslog(LOG_ERR, "cannot kill previous authpf (pid %d)",
232 otherpid);
233 goto dogdeath;
234 }
235 sleep(1);
236
237 /* re-open, and try again. The previous authpf process
238 * we killed above should unlink the file and release
239 * it's lock, giving us a chance to get it now
240 */
241 fclose(pidfp);
242 } while (1);
243
244 /* revoke privs */
245 seteuid(getuid());
246 setuid(getuid());
247
248 openlog("authpf", LOG_PID | LOG_NDELAY, LOG_DAEMON);
249
250 if (!check_luser(PATH_BAN_DIR, luser) || !allowed_luser(luser)) {
251 syslog(LOG_INFO, "user %s prohibited", luser);
252 do_death(0);
253 }
254
255 if (config == NULL || read_config(config)) {
256 syslog(LOG_INFO, "bad or nonexistent %s", PATH_CONFFILE);
257 do_death(0);
258 }
259
260 if (remove_stale_rulesets()) {
261 syslog(LOG_INFO, "error removing stale rulesets");
262 do_death(0);
263 }
264
265 /* We appear to be making headway, so actually mark our pid */
266 rewind(pidfp);
267 fprintf(pidfp, "%ld\n%s\n", (long)getpid(), luser);
268 fflush(pidfp);
71126e33 269 ftruncate(fileno(pidfp), ftell(pidfp));
95cc27f0
JS
270
271 if (change_filter(1, luser, ipsrc) == -1) {
272 printf("Unable to modify filters\r\n");
273 do_death(0);
274 }
275
276 signal(SIGTERM, need_death);
277 signal(SIGINT, need_death);
278 signal(SIGALRM, need_death);
279 signal(SIGPIPE, need_death);
280 signal(SIGHUP, need_death);
281 signal(SIGSTOP, need_death);
282 signal(SIGTSTP, need_death);
283 while (1) {
284 printf("\r\nHello %s, ", luser);
285 printf("You are authenticated from host \"%s\"\r\n", ipsrc);
286 setproctitle("%s@%s", luser, ipsrc);
287 print_message(PATH_MESSAGE);
288 while (1) {
289 sleep(10);
290 if (want_death)
291 do_death(1);
292 }
293 }
294
295 /* NOTREACHED */
296dogdeath:
297 printf("\r\n\r\nSorry, this service is currently unavailable due to ");
298 printf("technical difficulties\r\n\r\n");
299 print_message(PATH_PROBLEM);
300 printf("\r\nYour authentication process (pid %ld) was unable to run\n",
301 (long)getpid());
302 sleep(180); /* them lusers read reaaaaal slow */
303die:
304 do_death(0);
305}
306
307/*
308 * reads config file in PATH_CONFFILE to set optional behaviours up
309 */
310static int
311read_config(FILE *f)
312{
313 char buf[1024];
314 int i = 0;
315
316 do {
317 char **ap;
318 char *pair[4], *cp, *tp;
319 int len;
320
321 if (fgets(buf, sizeof(buf), f) == NULL) {
322 fclose(f);
323 return (0);
324 }
325 i++;
326 len = strlen(buf);
327 if (buf[len - 1] != '\n' && !feof(f)) {
328 syslog(LOG_ERR, "line %d too long in %s", i,
329 PATH_CONFFILE);
330 return (1);
331 }
332 buf[len - 1] = '\0';
333
334 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
335 ; /* nothing */
336
337 if (!*cp || *cp == '#' || *cp == '\n')
338 continue;
339
340 for (ap = pair; ap < &pair[3] &&
341 (*ap = strsep(&cp, "=")) != NULL; ) {
342 if (**ap != '\0')
343 ap++;
344 }
345 if (ap != &pair[2])
346 goto parse_error;
347
348 tp = pair[1] + strlen(pair[1]);
349 while ((*tp == ' ' || *tp == '\t') && tp >= pair[1])
350 *tp-- = '\0';
351
352 if (strcasecmp(pair[0], "anchor") == 0) {
353 if (!pair[1][0] || strlcpy(anchorname, pair[1],
354 sizeof(anchorname)) >= sizeof(anchorname))
355 goto parse_error;
356 }
357 } while (!feof(f) && !ferror(f));
358 fclose(f);
359 return (0);
360
361parse_error:
362 fclose(f);
363 syslog(LOG_ERR, "parse error, line %d of %s", i, PATH_CONFFILE);
364 return (1);
365}
366
367
368/*
369 * splatter a file to stdout - max line length of 1024,
370 * used for spitting message files at users to tell them
371 * they've been bad or we're unavailable.
372 */
373static void
374print_message(const char *filename)
375{
376 char buf[1024];
377 FILE *f;
378
379 if ((f = fopen(filename, "r")) == NULL)
380 return; /* fail silently, we don't care if it isn't there */
381
382 do {
383 if (fgets(buf, sizeof(buf), f) == NULL) {
384 fflush(stdout);
385 fclose(f);
386 return;
387 }
388 } while (fputs(buf, stdout) != EOF && !feof(f));
389 fflush(stdout);
390 fclose(f);
391}
392
393/*
394 * allowed_luser checks to see if user "luser" is allowed to
395 * use this gateway by virtue of being listed in an allowed
396 * users file, namely /etc/authpf/authpf.allow .
397 *
398 * If /etc/authpf/authpf.allow does not exist, then we assume that
399 * all users who are allowed in by sshd(8) are permitted to
400 * use this gateway. If /etc/authpf/authpf.allow does exist, then a
401 * user must be listed if the connection is to continue, else
402 * the session terminates in the same manner as being banned.
403 */
404static int
405allowed_luser(const char *user)
406{
407 char *buf, *lbuf;
408 int matched;
409 size_t len;
410 FILE *f;
411
412 if ((f = fopen(PATH_ALLOWFILE, "r")) == NULL) {
413 if (errno == ENOENT) {
414 /*
415 * allowfile doesn't exist, thus this gateway
416 * isn't restricted to certain users...
417 */
418 return (1);
419 }
420
421 /*
422 * user may in fact be allowed, but we can't open
423 * the file even though it's there. probably a config
424 * problem.
425 */
426 syslog(LOG_ERR, "cannot open allowed users file %s (%s)",
427 PATH_ALLOWFILE, strerror(errno));
428 return (0);
429 } else {
430 /*
431 * /etc/authpf/authpf.allow exists, thus we do a linear
432 * search to see if they are allowed.
433 * also, if username "*" exists, then this is a
434 * "public" gateway, such as it is, so let
435 * everyone use it.
436 */
437 lbuf = NULL;
438 while ((buf = fgetln(f, &len))) {
439 if (buf[len - 1] == '\n')
440 buf[len - 1] = '\0';
441 else {
442 if ((lbuf = (char *)malloc(len + 1)) == NULL)
443 err(1, NULL);
444 memcpy(lbuf, buf, len);
445 lbuf[len] = '\0';
446 buf = lbuf;
447 }
448
449 matched = strcmp(user, buf) == 0 || strcmp("*", buf) == 0;
450
451 if (lbuf != NULL) {
452 free(lbuf);
453 lbuf = NULL;
454 }
455
456 if (matched)
457 return (1); /* matched an allowed username */
458 }
459 syslog(LOG_INFO, "denied access to %s: not listed in %s",
460 user, PATH_ALLOWFILE);
461
462 fputs("\n\nSorry, you are not allowed to use this facility!\n",
463 stdout);
464 }
465 fflush(stdout);
466 return (0);
467}
468
469/*
470 * check_luser checks to see if user "luser" has been banned
471 * from using us by virtue of having an file of the same name
472 * in the "luserdir" directory.
473 *
474 * If the user has been banned, we copy the contents of the file
475 * to the user's screen. (useful for telling the user what to
476 * do to get un-banned, or just to tell them they aren't
477 * going to be un-banned.)
478 */
479static int
480check_luser(const char *userdir, const char *user)
481{
482 FILE *f;
483 int n;
484 char tmp[MAXPATHLEN];
485
486 n = snprintf(tmp, sizeof(tmp), "%s/%s", userdir, user);
487 if (n < 0 || (u_int)n >= sizeof(tmp)) {
488 syslog(LOG_ERR, "provided banned directory line too long (%s)",
489 userdir);
490 return (0);
491 }
492 if ((f = fopen(tmp, "r")) == NULL) {
493 if (errno == ENOENT) {
494 /*
495 * file or dir doesn't exist, so therefore
496 * this luser isn't banned.. all is well
497 */
498 return (1);
499 } else {
500 /*
501 * user may in fact be banned, but we can't open the
502 * file even though it's there. probably a config
503 * problem.
504 */
505 syslog(LOG_ERR, "cannot open banned file %s (%s)",
506 tmp, strerror(errno));
507 return (0);
508 }
509 } else {
510 /*
511 * user is banned - spit the file at them to
512 * tell what they can do and where they can go.
513 */
514 syslog(LOG_INFO, "denied access to %s: %s exists",
515 luser, tmp);
516
517 /* reuse tmp */
518 strlcpy(tmp, "\n\n-**- Sorry, you have been banned! -**-\n\n",
519 sizeof(tmp));
520 while (fputs(tmp, stdout) != EOF && !feof(f)) {
521 if (fgets(tmp, sizeof(tmp), f) == NULL) {
522 fflush(stdout);
523 return (0);
524 }
525 }
526 }
527 fflush(stdout);
528 return (0);
529}
530
531/*
532 * Search for rulesets left by other authpf processes (either because they
533 * died ungracefully or were terminated) and remove them.
534 */
535static int
536remove_stale_rulesets(void)
537{
538 struct pfioc_ruleset prs;
539 const int action[PF_RULESET_MAX] = { PF_SCRUB,
540 PF_PASS, PF_NAT, PF_BINAT, PF_RDR };
541 u_int32_t nr, mnr;
542
543 memset(&prs, 0, sizeof(prs));
544 strlcpy(prs.anchor, anchorname, sizeof(prs.anchor));
545 if (ioctl(dev_fd, DIOCGETRULESETS, &prs)) {
546 if (errno == EINVAL)
547 return (0);
548 else
549 return (1);
550 }
551
552 mnr = prs.nr;
553 nr = 0;
554 while (nr < mnr) {
555 char *s, *t;
556 pid_t pid;
557
558 prs.nr = nr;
559 if (ioctl(dev_fd, DIOCGETRULESET, &prs))
560 return (1);
561 errno = 0;
562 if ((t = strchr(prs.name, '(')) == NULL)
563 t = prs.name;
564 else
565 t++;
566 pid = strtoul(t, &s, 10);
567 if (!prs.name[0] || errno ||
568 (*s && (t == prs.name || *s != ')')))
569 return (1);
570 if (kill(pid, 0) && errno != EPERM) {
571 int i;
572
573 for (i = 0; i < PF_RULESET_MAX; ++i) {
574 struct pfioc_rule pr;
575
576 memset(&pr, 0, sizeof(pr));
577 memcpy(pr.anchor, prs.anchor, sizeof(pr.anchor));
578 memcpy(pr.ruleset, prs.name, sizeof(pr.ruleset));
579 pr.rule.action = action[i];
580 if ((ioctl(dev_fd, DIOCBEGINRULES, &pr) ||
581 ioctl(dev_fd, DIOCCOMMITRULES, &pr)) &&
582 errno != EINVAL)
583 return (1);
584 }
585 mnr--;
586 } else
587 nr++;
588 }
589 return (0);
590}
591
592/*
593 * Add/remove filter entries for user "luser" from ip "ipsrc"
594 */
595static int
596change_filter(int add, const char *user, const char *his_ipsrc)
597{
598 char fn[MAXPATHLEN];
599 FILE *f = NULL;
600 struct pfctl pf;
601 struct pfr_buffer t;
602 int i;
603
604 if (user == NULL || !user[0] || his_ipsrc == NULL || !his_ipsrc[0]) {
605 syslog(LOG_ERR, "invalid luser/ipsrc");
606 goto error;
607 }
608
609 if (add) {
610 if ((i = snprintf(fn, sizeof(fn), "%s/%s/authpf.rules",
611 PATH_USER_DIR, user)) < 0 || i >= (int)sizeof(fn)) {
612 syslog(LOG_ERR, "user rule path too long");
613 goto error;
614 }
615 if ((f = fopen(fn, "r")) == NULL && errno != ENOENT) {
616 syslog(LOG_ERR, "cannot open %s (%m)", fn);
617 goto error;
618 }
619 if (f == NULL) {
620 if (strlcpy(fn, PATH_PFRULES, sizeof(fn)) >=
621 sizeof(fn)) {
622 syslog(LOG_ERR, "rule path too long");
623 goto error;
624 }
625 if ((f = fopen(fn, "r")) == NULL) {
626 syslog(LOG_ERR, "cannot open %s (%m)", fn);
627 goto error;
628 }
629 }
630 }
631
632 if (pfctl_load_fingerprints(dev_fd, 0)) {
633 syslog(LOG_ERR, "unable to load kernel's OS fingerprints");
634 goto error;
635 }
636 bzero(&t, sizeof(t));
637 t.pfrb_type = PFRB_TRANS;
638 memset(&pf, 0, sizeof(pf));
639 for (i = 0; i < PF_RULESET_MAX; ++i) {
640 if (pfctl_add_trans(&t, i, anchorname, rulesetname)) {
641 syslog(LOG_ERR, "pfctl_add_trans %m");
642 goto error;
643 }
644 }
645 if (pfctl_trans(dev_fd, &t, DIOCXBEGIN, 0)) {
646 syslog(LOG_ERR, "DIOCXBEGIN (%s) %m", add?"add":"remove");
647 goto error;
648 }
649
650 if (add) {
651 if (symset("user_ip", his_ipsrc, 0) ||
652 symset("user_id", user, 0)) {
653 syslog(LOG_ERR, "symset");
654 goto error;
655 }
656
657 pf.dev = dev_fd;
658 pf.trans = &t;
659 pf.anchor = anchorname;
660 pf.ruleset = rulesetname;
661
662 infile = fn;
663 if (parse_rules(f, &pf) < 0) {
664 syslog(LOG_ERR, "syntax error in rule file: "
665 "authpf rules not loaded");
666 goto error;
667 }
668
669 infile = NULL;
670 fclose(f);
671 f = NULL;
672 }
673
674 if (pfctl_trans(dev_fd, &t, DIOCXCOMMIT, 0)) {
675 syslog(LOG_ERR, "DIOCXCOMMIT (%s) %m", add?"add":"remove");
676 goto error;
677 }
678
679 if (add) {
680 gettimeofday(&Tstart, NULL);
681 syslog(LOG_INFO, "allowing %s, user %s", his_ipsrc, user);
682 } else {
683 gettimeofday(&Tend, NULL);
684 syslog(LOG_INFO, "removed %s, user %s - duration %ld seconds",
685 his_ipsrc, user, Tend.tv_sec - Tstart.tv_sec);
686 }
687 return (0);
688
689error:
690 if (f != NULL)
691 fclose(f);
692 if (pfctl_trans(dev_fd, &t, DIOCXROLLBACK, 0))
693 syslog(LOG_ERR, "DIOCXROLLBACK (%s) %m", add?"add":"remove");
694
695 infile = NULL;
696 return (-1);
697}
698
699/*
700 * This is to kill off states that would otherwise be left behind stateful
701 * rules. This means we don't need to allow in more traffic than we really
702 * want to, since we don't have to worry about any luser sessions lasting
703 * longer than their ssh session. This function is based on
704 * pfctl_kill_states from pfctl.
705 */
706static void
707authpf_kill_states(void)
708{
709 struct pfioc_state_kill psk;
710 struct in_addr target;
711
712 memset(&psk, 0, sizeof(psk));
713 psk.psk_af = AF_INET;
714
715 inet_pton(AF_INET, ipsrc, &target);
716
717 /* Kill all states from ipsrc */
718 psk.psk_src.addr.v.a.addr.v4 = target;
719 memset(&psk.psk_src.addr.v.a.mask, 0xff,
720 sizeof(psk.psk_src.addr.v.a.mask));
721 if (ioctl(dev_fd, DIOCKILLSTATES, &psk))
722 syslog(LOG_ERR, "DIOCKILLSTATES failed (%m)");
723
724 /* Kill all states to ipsrc */
725 psk.psk_af = AF_INET;
726 memset(&psk.psk_src, 0, sizeof(psk.psk_src));
727 psk.psk_dst.addr.v.a.addr.v4 = target;
728 memset(&psk.psk_dst.addr.v.a.mask, 0xff,
729 sizeof(psk.psk_dst.addr.v.a.mask));
730 if (ioctl(dev_fd, DIOCKILLSTATES, &psk))
731 syslog(LOG_ERR, "DIOCKILLSTATES failed (%m)");
732}
733
734/* signal handler that makes us go away properly */
735static void
736need_death(int signo __unused)
737{
738 want_death = 1;
739}
740
741/*
742 * function that removes our stuff when we go away.
743 */
744static __dead void
745do_death(int active)
746{
747 int ret = 0;
748
749 if (active) {
750 change_filter(0, luser, ipsrc);
751 authpf_kill_states();
752 remove_stale_rulesets();
753 }
754 if (pidfp)
755 ftruncate(fileno(pidfp), 0);
756 if (pidfile[0])
757 if (unlink(pidfile) == -1)
758 syslog(LOG_ERR, "cannot unlink %s (%m)", pidfile);
759 exit(ret);
760}
761
762/*
763 * callbacks for parse_rules(void)
764 */
765
766int
767pfctl_add_rule(struct pfctl *pf, struct pf_rule *r)
768{
769 u_int8_t rs_num;
770 struct pfioc_rule pr;
771
772 switch (r->action) {
773 case PF_PASS:
774 case PF_DROP:
775 rs_num = PF_RULESET_FILTER;
776 break;
777 case PF_SCRUB:
778 rs_num = PF_RULESET_SCRUB;
779 break;
780 case PF_NAT:
781 case PF_NONAT:
782 rs_num = PF_RULESET_NAT;
783 break;
784 case PF_RDR:
785 case PF_NORDR:
786 rs_num = PF_RULESET_RDR;
787 break;
788 case PF_BINAT:
789 case PF_NOBINAT:
790 rs_num = PF_RULESET_BINAT;
791 break;
792 default:
793 syslog(LOG_ERR, "invalid rule action %d", r->action);
794 return (1);
795 }
796
797 bzero(&pr, sizeof(pr));
798 strlcpy(pr.anchor, pf->anchor, sizeof(pr.anchor));
799 strlcpy(pr.ruleset, pf->ruleset, sizeof(pr.ruleset));
800 if (pfctl_add_pool(pf, &r->rpool, r->af))
801 return (1);
802 pr.ticket = pfctl_get_ticket(pf->trans, rs_num, pf->anchor,
803 pf->ruleset);
804 pr.pool_ticket = pf->paddr.ticket;
805 memcpy(&pr.rule, r, sizeof(pr.rule));
806 if (ioctl(pf->dev, DIOCADDRULE, &pr)) {
807 syslog(LOG_ERR, "DIOCADDRULE %m");
808 return (1);
809 }
810 pfctl_clear_pool(&r->rpool);
811 return (0);
812}
813
814int
815pfctl_add_pool(struct pfctl *pf, struct pf_pool *p, sa_family_t af)
816{
817 struct pf_pooladdr *pa;
818
819 if (ioctl(pf->dev, DIOCBEGINADDRS, &pf->paddr)) {
820 syslog(LOG_ERR, "DIOCBEGINADDRS %m");
821 return (1);
822 }
823 pf->paddr.af = af;
824 TAILQ_FOREACH(pa, &p->list, entries) {
825 memcpy(&pf->paddr.addr, pa, sizeof(struct pf_pooladdr));
826 if (ioctl(pf->dev, DIOCADDADDR, &pf->paddr)) {
827 syslog(LOG_ERR, "DIOCADDADDR %m");
828 return (1);
829 }
830 }
831 return (0);
832}
833
834void
835pfctl_clear_pool(struct pf_pool *pool)
836{
837 struct pf_pooladdr *pa;
838
839 while ((pa = TAILQ_FIRST(&pool->list)) != NULL) {
840 TAILQ_REMOVE(&pool->list, pa, entries);
841 free(pa);
842 }
843}
844
845int
846pfctl_add_altq(struct pfctl *pf __unused, struct pf_altq *a __unused)
847{
848 fprintf(stderr, "altq rules not supported in authpf\n");
849 return (1);
850}
851
852int
853pfctl_set_optimization(struct pfctl *pf __unused, const char *opt __unused)
854{
855 fprintf(stderr, "set optimization not supported in authpf\n");
856 return (1);
857}
858
859int
860pfctl_set_logif(struct pfctl *pf __unused, char *ifname __unused)
861{
862 fprintf(stderr, "set loginterface not supported in authpf\n");
863 return (1);
864}
865
866int
867pfctl_set_hostid(struct pfctl *pf __unused, u_int32_t hostid __unused)
868{
869 fprintf(stderr, "set hostid not supported in authpf\n");
870 return (1);
871}
872
873int
874pfctl_set_timeout(struct pfctl *pf __unused, const char *opt __unused,
875 int seconds __unused, int quiet __unused)
876{
877 fprintf(stderr, "set timeout not supported in authpf\n");
878 return (1);
879}
880
881int
882pfctl_set_limit(struct pfctl *pf __unused, const char *opt __unused,
883 unsigned int limit __unused)
884{
885 fprintf(stderr, "set limit not supported in authpf\n");
886 return (1);
887}
888
889int
890pfctl_set_debug(struct pfctl *pf __unused, char *d __unused)
891{
892 fprintf(stderr, "set debug not supported in authpf\n");
893 return (1);
894}
895
896int
897pfctl_define_table(char *name __unused, int flags __unused, int addrs __unused,
898 const char *anchor __unused, const char *ruleset __unused,
899 struct pfr_buffer *ab __unused, u_int32_t ticket __unused)
900{
901 fprintf(stderr, "table definitions not yet supported in authpf\n");
902 return (1);
903}
904
905int
906pfctl_rules(int dev __unused, char *filename __unused, int opts __unused,
907 char *my_anchorname __unused, char *my_rulesetname __unused,
908 struct pfr_buffer *t __unused)
909{
910 /* never called, no anchors inside anchors, but we need the stub */
911 fprintf(stderr, "load anchor not supported from authpf\n");
912 return (1);
913}
914
915void
916pfctl_print_title(const char *title __unused)
917{
918}