Fix exec from setuid/setgid binaries

[dragonfly.git] / usr.sbin / authpf / authpf.c

/*      $OpenBSD: authpf.c,v 1.75 2004/01/29 01:55:10 deraadt Exp $     */
/*      $DragonFly: src/usr.sbin/authpf/authpf.c,v 1.2 2004/12/18 22:48:02 swildner Exp $ */

/*
 * Copyright (C) 1998 - 2002 Bob Beck (beck@openbsd.org).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>

#include <net/if.h>
#include <net/pf/pfvar.h>
#include <arpa/inet.h>

#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include "pfctl_parser.h"
#include "pfctl.h"

#include "pathnames.h"

#define __dead __dead2

extern int      symset(const char *, const char *, int);

static int      read_config(FILE *);
static void     print_message(const char *);
static int      allowed_luser(const char *);
static int      check_luser(const char *, const char *);
static int      remove_stale_rulesets(void);
static int      change_filter(int, const char *, const char *);
static void     authpf_kill_states(void);

int     dev_fd;                 /* pf device */
char    anchorname[PF_ANCHOR_NAME_SIZE] = "authpf";
char    rulesetname[PF_RULESET_NAME_SIZE];

FILE    *pidfp;
char    *infile;                /* file name printed by yyerror() in parse.y */
char     luser[MAXLOGNAME];     /* username */
char     ipsrc[256];            /* ip as a string */
char     pidfile[MAXPATHLEN];   /* we save pid in this file. */

struct timeval  Tstart, Tend;   /* start and end times of session */

volatile sig_atomic_t   want_death;
static void             need_death(int signo);
static __dead void      do_death(int);

/*
 * User shell for authenticating gateways. Sole purpose is to allow
 * a user to ssh to a gateway, and have the gateway modify packet
 * filters to allow access, then remove access when the user finishes
 * up. Meant to be used only from ssh(1) connections.
 */
int
main(int argc __unused, char **argv __unused)
{
        int              lockcnt = 0, n, pidfd;
        FILE            *config;
        struct in_addr   ina;
        struct passwd   *pw;
        char            *cp;
        uid_t            uid;

        config = fopen(PATH_CONFFILE, "r");

        if ((cp = getenv("SSH_TTY")) == NULL) {
                syslog(LOG_ERR, "non-interactive session connection for authpf");
                exit(1);
        }

        if ((cp = getenv("SSH_CLIENT")) == NULL) {
                syslog(LOG_ERR, "cannot determine connection source");
                exit(1);
        }

        if (strlcpy(ipsrc, cp, sizeof(ipsrc)) >= sizeof(ipsrc)) {
                syslog(LOG_ERR, "SSH_CLIENT variable too long");
                exit(1);
        }
        cp = strchr(ipsrc, ' ');
        if (!cp) {
                syslog(LOG_ERR, "corrupt SSH_CLIENT variable %s", ipsrc);
                exit(1);
        }
        *cp = '\0';
        if (inet_pton(AF_INET, ipsrc, &ina) != 1) {
                syslog(LOG_ERR,
                    "cannot determine IP from SSH_CLIENT %s", ipsrc);
                exit(1);
        }
        /* open the pf device */
        dev_fd = open(PATH_DEVFILE, O_RDWR);
        if (dev_fd == -1) {
                syslog(LOG_ERR, "cannot open packet filter device (%m)");
                goto die;
        }

        uid = getuid();
        pw = getpwuid(uid);
        if (pw == NULL) {
                syslog(LOG_ERR, "cannot find user for uid %u", uid);
                goto die;
        }
        if (strcmp(pw->pw_shell, PATH_AUTHPF_SHELL)) {
                syslog(LOG_ERR, "wrong shell for user %s, uid %u",
                    pw->pw_name, pw->pw_uid);
                goto die;
        }

        /*
         * Paranoia, but this data _does_ come from outside authpf, and
         * truncation would be bad.
         */
        if (strlcpy(luser, pw->pw_name, sizeof(luser)) >= sizeof(luser)) {
                syslog(LOG_ERR, "username too long: %s", pw->pw_name);
                goto die;
        }

        if ((n = snprintf(rulesetname, sizeof(rulesetname), "%s(%ld)",
            luser, (long)getpid())) < 0 || n >= (int)sizeof(rulesetname)) {
                syslog(LOG_INFO, "%s(%ld) too large, ruleset name will be %ld",
                    luser, (long)getpid(), (long)getpid());
                if ((n = snprintf(rulesetname, sizeof(rulesetname), "%ld",
                    (long)getpid())) < 0 || n >= (int)sizeof(rulesetname)) {
                        syslog(LOG_ERR, "pid too large for ruleset name");
                        goto die;
                }
        }


        /* Make our entry in /var/authpf as /var/authpf/ipaddr */
        n = snprintf(pidfile, sizeof(pidfile), "%s/%s", PATH_PIDFILE, ipsrc);
        if (n < 0 || (u_int)n >= sizeof(pidfile)) {
                syslog(LOG_ERR, "path to pidfile too long");
                goto die;
        }

        /*
         * If someone else is already using this ip, then this person
         * wants to switch users - so kill the old process and exit
         * as well.
         *
         * Note, we could print a message and tell them to log out, but the
         * usual case of this is that someone has left themselves logged in,
         * with the authenticated connection iconized and someone else walks
         * up to use and automatically logs in before using. If this just
         * gets rid of the old one silently, the new user never knows they
         * could have used someone else's old authentication. If we
         * tell them to log out before switching users it is an invitation
         * for abuse.
         */

        do {
                int     save_errno, otherpid = -1;
                char    otherluser[MAXLOGNAME];

                if ((pidfd = open(pidfile, O_RDWR|O_CREAT, 0644)) == -1 ||
                    (pidfp = fdopen(pidfd, "r+")) == NULL) {
                        if (pidfd != -1)
                                close(pidfd);
                        syslog(LOG_ERR, "cannot open or create %s: %s", pidfile,
                            strerror(errno));
                        goto die;
                }

                if (flock(fileno(pidfp), LOCK_EX|LOCK_NB) == 0)
                        break;
                save_errno = errno;

                /* Mark our pid, and username to our file. */

                rewind(pidfp);
                /* 31 == MAXLOGNAME - 1 */
                if (fscanf(pidfp, "%d\n%31s\n", &otherpid, otherluser) != 2)
                        otherpid = -1;
                syslog(LOG_DEBUG, "tried to lock %s, in use by pid %d: %s",
                    pidfile, otherpid, strerror(save_errno));

                if (otherpid > 0) {
                        syslog(LOG_INFO,
                            "killing prior auth (pid %d) of %s by user %s",
                            otherpid, ipsrc, otherluser);
                        if (kill((pid_t) otherpid, SIGTERM) == -1) {
                                syslog(LOG_INFO,
                                    "could not kill process %d: (%m)",
                                    otherpid);
                        }
                }

                /*
                 * we try to kill the previous process and acquire the lock
                 * for 10 seconds, trying once a second. if we can't after
                 * 10 attempts we log an error and give up
                 */
                if (++lockcnt > 10) {
                        syslog(LOG_ERR, "cannot kill previous authpf (pid %d)",
                            otherpid);
                        goto dogdeath;
                }
                sleep(1);

                /* re-open, and try again. The previous authpf process
                 * we killed above should unlink the file and release
                 * it's lock, giving us a chance to get it now
                 */
                fclose(pidfp);
        } while (1);

        /* revoke privs */
        seteuid(getuid());
        setuid(getuid());

        openlog("authpf", LOG_PID | LOG_NDELAY, LOG_DAEMON);

        if (!check_luser(PATH_BAN_DIR, luser) || !allowed_luser(luser)) {
                syslog(LOG_INFO, "user %s prohibited", luser);
                do_death(0);
        }

        if (config == NULL || read_config(config)) {
                syslog(LOG_INFO, "bad or nonexistent %s", PATH_CONFFILE);
                do_death(0);
        }

        if (remove_stale_rulesets()) {
                syslog(LOG_INFO, "error removing stale rulesets");
                do_death(0);
        }

        /* We appear to be making headway, so actually mark our pid */
        rewind(pidfp);
        fprintf(pidfp, "%ld\n%s\n", (long)getpid(), luser);
        fflush(pidfp);
        ftruncate(fileno(pidfp), ftell(pidfp));

        if (change_filter(1, luser, ipsrc) == -1) {
                printf("Unable to modify filters\r\n");
                do_death(0);
        }

        signal(SIGTERM, need_death);
        signal(SIGINT, need_death);
        signal(SIGALRM, need_death);
        signal(SIGPIPE, need_death);
        signal(SIGHUP, need_death);
        signal(SIGSTOP, need_death);
        signal(SIGTSTP, need_death);
        while (1) {
                printf("\r\nHello %s, ", luser);
                printf("You are authenticated from host \"%s\"\r\n", ipsrc);
                setproctitle("%s@%s", luser, ipsrc);
                print_message(PATH_MESSAGE);
                while (1) {
                        sleep(10);
                        if (want_death)
                                do_death(1);
                }
        }

        /* NOTREACHED */
dogdeath:
        printf("\r\n\r\nSorry, this service is currently unavailable due to ");
        printf("technical difficulties\r\n\r\n");
        print_message(PATH_PROBLEM);
        printf("\r\nYour authentication process (pid %ld) was unable to run\n",
            (long)getpid());
        sleep(180); /* them lusers read reaaaaal slow */
die:
        do_death(0);
}

/*
 * reads config file in PATH_CONFFILE to set optional behaviours up
 */
static int
read_config(FILE *f)
{
        char    buf[1024];
        int     i = 0;

        do {
                char    **ap;
                char     *pair[4], *cp, *tp;
                int       len;

                if (fgets(buf, sizeof(buf), f) == NULL) {
                        fclose(f);
                        return (0);
                }
                i++;
                len = strlen(buf);
                if (buf[len - 1] != '\n' && !feof(f)) {
                        syslog(LOG_ERR, "line %d too long in %s", i,
                            PATH_CONFFILE);
                        return (1);
                }
                buf[len - 1] = '\0';

                for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
                        ; /* nothing */

                if (!*cp || *cp == '#' || *cp == '\n')
                        continue;

                for (ap = pair; ap < &pair[3] &&
                    (*ap = strsep(&cp, "=")) != NULL; ) {
                        if (**ap != '\0')
                                ap++;
                }
                if (ap != &pair[2])
                        goto parse_error;

                tp = pair[1] + strlen(pair[1]);
                while ((*tp == ' ' || *tp == '\t') && tp >= pair[1])
                        *tp-- = '\0';

                if (strcasecmp(pair[0], "anchor") == 0) {
                        if (!pair[1][0] || strlcpy(anchorname, pair[1],
                            sizeof(anchorname)) >= sizeof(anchorname))
                                goto parse_error;
                }
        } while (!feof(f) && !ferror(f));
        fclose(f);
        return (0);

parse_error:
        fclose(f);
        syslog(LOG_ERR, "parse error, line %d of %s", i, PATH_CONFFILE);
        return (1);
}


/*
 * splatter a file to stdout - max line length of 1024,
 * used for spitting message files at users to tell them
 * they've been bad or we're unavailable.
 */
static void
print_message(const char *filename)
{
        char     buf[1024];
        FILE    *f;

        if ((f = fopen(filename, "r")) == NULL)
                return; /* fail silently, we don't care if it isn't there */

        do {
                if (fgets(buf, sizeof(buf), f) == NULL) {
                        fflush(stdout);
                        fclose(f);
                        return;
                }
        } while (fputs(buf, stdout) != EOF && !feof(f));
        fflush(stdout);
        fclose(f);
}

/*
 * allowed_luser checks to see if user "luser" is allowed to
 * use this gateway by virtue of being listed in an allowed
 * users file, namely /etc/authpf/authpf.allow .
 *
 * If /etc/authpf/authpf.allow does not exist, then we assume that
 * all users who are allowed in by sshd(8) are permitted to
 * use this gateway. If /etc/authpf/authpf.allow does exist, then a
 * user must be listed if the connection is to continue, else
 * the session terminates in the same manner as being banned.
 */
static int
allowed_luser(const char *user)
{
        char    *buf, *lbuf;
        int      matched;
        size_t   len;
        FILE    *f;

        if ((f = fopen(PATH_ALLOWFILE, "r")) == NULL) {
                if (errno == ENOENT) {
                        /*
                         * allowfile doesn't exist, thus this gateway
                         * isn't restricted to certain users...
                         */
                        return (1);
                }

                /*
                 * user may in fact be allowed, but we can't open
                 * the file even though it's there. probably a config
                 * problem.
                 */
                syslog(LOG_ERR, "cannot open allowed users file %s (%s)",
                    PATH_ALLOWFILE, strerror(errno));
                return (0);
        } else {
                /*
                 * /etc/authpf/authpf.allow exists, thus we do a linear
                 * search to see if they are allowed.
                 * also, if username "*" exists, then this is a
                 * "public" gateway, such as it is, so let
                 * everyone use it.
                 */
                lbuf = NULL;
                while ((buf = fgetln(f, &len))) {
                        if (buf[len - 1] == '\n')
                                buf[len - 1] = '\0';
                        else {
                                if ((lbuf = (char *)malloc(len + 1)) == NULL)
                                        err(1, NULL);
                                memcpy(lbuf, buf, len);
                                lbuf[len] = '\0';
                                buf = lbuf;
                        }

                        matched = strcmp(user, buf) == 0 || strcmp("*", buf) == 0;

                        if (lbuf != NULL) {
                                free(lbuf);
                                lbuf = NULL;
                        }

                        if (matched)
                                return (1); /* matched an allowed username */
                }
                syslog(LOG_INFO, "denied access to %s: not listed in %s",
                    user, PATH_ALLOWFILE);

                fputs("\n\nSorry, you are not allowed to use this facility!\n",
                      stdout);
        }
        fflush(stdout);
        return (0);
}

/*
 * check_luser checks to see if user "luser" has been banned
 * from using us by virtue of having an file of the same name
 * in the "luserdir" directory.
 *
 * If the user has been banned, we copy the contents of the file
 * to the user's screen. (useful for telling the user what to
 * do to get un-banned, or just to tell them they aren't
 * going to be un-banned.)
 */
static int
check_luser(const char *userdir, const char *user)
{
        FILE    *f;
        int      n;
        char     tmp[MAXPATHLEN];

        n = snprintf(tmp, sizeof(tmp), "%s/%s", userdir, user);
        if (n < 0 || (u_int)n >= sizeof(tmp)) {
                syslog(LOG_ERR, "provided banned directory line too long (%s)",
                    userdir);
                return (0);
        }
        if ((f = fopen(tmp, "r")) == NULL) {
                if (errno == ENOENT) {
                        /*
                         * file or dir doesn't exist, so therefore
                         * this luser isn't banned..  all is well
                         */
                        return (1);
                } else {
                        /*
                         * user may in fact be banned, but we can't open the
                         * file even though it's there. probably a config
                         * problem.
                         */
                        syslog(LOG_ERR, "cannot open banned file %s (%s)",
                            tmp, strerror(errno));
                        return (0);
                }
        } else {
                /*
                 * user is banned - spit the file at them to
                 * tell what they can do and where they can go.
                 */
                syslog(LOG_INFO, "denied access to %s: %s exists",
                    luser, tmp);

                /* reuse tmp */
                strlcpy(tmp, "\n\n-**- Sorry, you have been banned! -**-\n\n",
                    sizeof(tmp));
                while (fputs(tmp, stdout) != EOF && !feof(f)) {
                        if (fgets(tmp, sizeof(tmp), f) == NULL) {
                                fflush(stdout);
                                return (0);
                        }
                }
        }
        fflush(stdout);
        return (0);
}

/*
 * Search for rulesets left by other authpf processes (either because they
 * died ungracefully or were terminated) and remove them.
 */
static int
remove_stale_rulesets(void)
{
        struct pfioc_ruleset     prs;
        const int                action[PF_RULESET_MAX] = { PF_SCRUB,
                                    PF_PASS, PF_NAT, PF_BINAT, PF_RDR };
        u_int32_t                nr, mnr;

        memset(&prs, 0, sizeof(prs));
        strlcpy(prs.anchor, anchorname, sizeof(prs.anchor));
        if (ioctl(dev_fd, DIOCGETRULESETS, &prs)) {
                if (errno == EINVAL)
                        return (0);
                else
                        return (1);
        }

        mnr = prs.nr;
        nr = 0;
        while (nr < mnr) {
                char    *s, *t;
                pid_t    pid;

                prs.nr = nr;
                if (ioctl(dev_fd, DIOCGETRULESET, &prs))
                        return (1);
                errno = 0;
                if ((t = strchr(prs.name, '(')) == NULL)
                        t = prs.name;
                else
                        t++;
                pid = strtoul(t, &s, 10);
                if (!prs.name[0] || errno ||
                    (*s && (t == prs.name || *s != ')')))
                        return (1);
                if (kill(pid, 0) && errno != EPERM) {
                        int i;

                        for (i = 0; i < PF_RULESET_MAX; ++i) {
                                struct pfioc_rule pr;

                                memset(&pr, 0, sizeof(pr));
                                memcpy(pr.anchor, prs.anchor, sizeof(pr.anchor));
                                memcpy(pr.ruleset, prs.name, sizeof(pr.ruleset));
                                pr.rule.action = action[i];
                                if ((ioctl(dev_fd, DIOCBEGINRULES, &pr) ||
                                    ioctl(dev_fd, DIOCCOMMITRULES, &pr)) &&
                                    errno != EINVAL)
                                        return (1);
                        }
                        mnr--;
                } else
                        nr++;
        }
        return (0);
}

/*
 * Add/remove filter entries for user "luser" from ip "ipsrc"
 */
static int
change_filter(int add, const char *user, const char *his_ipsrc)
{
        char                     fn[MAXPATHLEN];
        FILE                    *f = NULL;
        struct pfctl             pf;
        struct pfr_buffer        t;
        int i;

        if (user == NULL || !user[0] || his_ipsrc == NULL || !his_ipsrc[0]) {
                syslog(LOG_ERR, "invalid luser/ipsrc");
                goto error;
        }

        if (add) {
                if ((i = snprintf(fn, sizeof(fn), "%s/%s/authpf.rules",
                    PATH_USER_DIR, user)) < 0 || i >= (int)sizeof(fn)) {
                        syslog(LOG_ERR, "user rule path too long");
                        goto error;
                }
                if ((f = fopen(fn, "r")) == NULL && errno != ENOENT) {
                        syslog(LOG_ERR, "cannot open %s (%m)", fn);
                        goto error;
                }
                if (f == NULL) {
                        if (strlcpy(fn, PATH_PFRULES, sizeof(fn)) >=
                            sizeof(fn)) {
                                syslog(LOG_ERR, "rule path too long");
                                goto error;
                        }
                        if ((f = fopen(fn, "r")) == NULL) {
                                syslog(LOG_ERR, "cannot open %s (%m)", fn);
                                goto error;
                        }
                }
        }

        if (pfctl_load_fingerprints(dev_fd, 0)) {
                syslog(LOG_ERR, "unable to load kernel's OS fingerprints");
                goto error;
        }
        bzero(&t, sizeof(t));
        t.pfrb_type = PFRB_TRANS;
        memset(&pf, 0, sizeof(pf));
        for (i = 0; i < PF_RULESET_MAX; ++i) {
                if (pfctl_add_trans(&t, i, anchorname, rulesetname)) {
                        syslog(LOG_ERR, "pfctl_add_trans %m");
                        goto error;
                }
        }
        if (pfctl_trans(dev_fd, &t, DIOCXBEGIN, 0)) {
                syslog(LOG_ERR, "DIOCXBEGIN (%s) %m", add?"add":"remove");
                goto error;
        }

        if (add) {
                if (symset("user_ip", his_ipsrc, 0) ||
                    symset("user_id", user, 0)) {
                        syslog(LOG_ERR, "symset");
                        goto error;
                }

                pf.dev = dev_fd;
                pf.trans = &t;
                pf.anchor = anchorname;
                pf.ruleset = rulesetname;

                infile = fn;
                if (parse_rules(f, &pf) < 0) {
                        syslog(LOG_ERR, "syntax error in rule file: "
                            "authpf rules not loaded");
                        goto error;
                }

                infile = NULL;
                fclose(f);
                f = NULL;
        }

        if (pfctl_trans(dev_fd, &t, DIOCXCOMMIT, 0)) {
                syslog(LOG_ERR, "DIOCXCOMMIT (%s) %m", add?"add":"remove");
                goto error;
        }

        if (add) {
                gettimeofday(&Tstart, NULL);
                syslog(LOG_INFO, "allowing %s, user %s", his_ipsrc, user);
        } else {
                gettimeofday(&Tend, NULL);
                syslog(LOG_INFO, "removed %s, user %s - duration %ld seconds",
                    his_ipsrc, user, Tend.tv_sec - Tstart.tv_sec);
        }
        return (0);

error:
        if (f != NULL)
                fclose(f);
        if (pfctl_trans(dev_fd, &t, DIOCXROLLBACK, 0))
                syslog(LOG_ERR, "DIOCXROLLBACK (%s) %m", add?"add":"remove");

        infile = NULL;
        return (-1);
}

/*
 * This is to kill off states that would otherwise be left behind stateful
 * rules. This means we don't need to allow in more traffic than we really
 * want to, since we don't have to worry about any luser sessions lasting
 * longer than their ssh session. This function is based on
 * pfctl_kill_states from pfctl.
 */
static void
authpf_kill_states(void)
{
        struct pfioc_state_kill psk;
        struct in_addr          target;

        memset(&psk, 0, sizeof(psk));
        psk.psk_af = AF_INET;

        inet_pton(AF_INET, ipsrc, &target);

        /* Kill all states from ipsrc */
        psk.psk_src.addr.v.a.addr.v4 = target;
        memset(&psk.psk_src.addr.v.a.mask, 0xff,
            sizeof(psk.psk_src.addr.v.a.mask));
        if (ioctl(dev_fd, DIOCKILLSTATES, &psk))
                syslog(LOG_ERR, "DIOCKILLSTATES failed (%m)");

        /* Kill all states to ipsrc */
        psk.psk_af = AF_INET;
        memset(&psk.psk_src, 0, sizeof(psk.psk_src));
        psk.psk_dst.addr.v.a.addr.v4 = target;
        memset(&psk.psk_dst.addr.v.a.mask, 0xff,
            sizeof(psk.psk_dst.addr.v.a.mask));
        if (ioctl(dev_fd, DIOCKILLSTATES, &psk))
                syslog(LOG_ERR, "DIOCKILLSTATES failed (%m)");
}

/* signal handler that makes us go away properly */
static void
need_death(int signo __unused)
{
        want_death = 1;
}

/*
 * function that removes our stuff when we go away.
 */
static __dead void
do_death(int active)
{
        int     ret = 0;

        if (active) {
                change_filter(0, luser, ipsrc);
                authpf_kill_states();
                remove_stale_rulesets();
        }
        if (pidfp)
                ftruncate(fileno(pidfp), 0);
        if (pidfile[0])
                if (unlink(pidfile) == -1)
                        syslog(LOG_ERR, "cannot unlink %s (%m)", pidfile);
        exit(ret);
}

/*
 * callbacks for parse_rules(void)
 */

int
pfctl_add_rule(struct pfctl *pf, struct pf_rule *r)
{
        u_int8_t                rs_num;
        struct pfioc_rule       pr;

        switch (r->action) {
        case PF_PASS:
        case PF_DROP:
                rs_num = PF_RULESET_FILTER;
                break;
        case PF_SCRUB:
                rs_num = PF_RULESET_SCRUB;
                break;
        case PF_NAT:
        case PF_NONAT:
                rs_num = PF_RULESET_NAT;
                break;
        case PF_RDR:
        case PF_NORDR:
                rs_num = PF_RULESET_RDR;
                break;
        case PF_BINAT:
        case PF_NOBINAT:
                rs_num = PF_RULESET_BINAT;
                break;
        default:
                syslog(LOG_ERR, "invalid rule action %d", r->action);
                return (1);
        }

        bzero(&pr, sizeof(pr));
        strlcpy(pr.anchor, pf->anchor, sizeof(pr.anchor));
        strlcpy(pr.ruleset, pf->ruleset, sizeof(pr.ruleset));
        if (pfctl_add_pool(pf, &r->rpool, r->af))
                return (1);
        pr.ticket = pfctl_get_ticket(pf->trans, rs_num, pf->anchor,
            pf->ruleset);
        pr.pool_ticket = pf->paddr.ticket;
        memcpy(&pr.rule, r, sizeof(pr.rule));
        if (ioctl(pf->dev, DIOCADDRULE, &pr)) {
                syslog(LOG_ERR, "DIOCADDRULE %m");
                return (1);
        }
        pfctl_clear_pool(&r->rpool);
        return (0);
}

int
pfctl_add_pool(struct pfctl *pf, struct pf_pool *p, sa_family_t af)
{
        struct pf_pooladdr      *pa;

        if (ioctl(pf->dev, DIOCBEGINADDRS, &pf->paddr)) {
                syslog(LOG_ERR, "DIOCBEGINADDRS %m");
                return (1);
        }
        pf->paddr.af = af;
        TAILQ_FOREACH(pa, &p->list, entries) {
                memcpy(&pf->paddr.addr, pa, sizeof(struct pf_pooladdr));
                if (ioctl(pf->dev, DIOCADDADDR, &pf->paddr)) {
                        syslog(LOG_ERR, "DIOCADDADDR %m");
                        return (1);
                }
        }
        return (0);
}

void
pfctl_clear_pool(struct pf_pool *pool)
{
        struct pf_pooladdr      *pa;

        while ((pa = TAILQ_FIRST(&pool->list)) != NULL) {
                TAILQ_REMOVE(&pool->list, pa, entries);
                free(pa);
        }
}

int
pfctl_add_altq(struct pfctl *pf __unused, struct pf_altq *a __unused)
{
        fprintf(stderr, "altq rules not supported in authpf\n");
        return (1);
}

int
pfctl_set_optimization(struct pfctl *pf __unused, const char *opt __unused)
{
        fprintf(stderr, "set optimization not supported in authpf\n");
        return (1);
}

int
pfctl_set_logif(struct pfctl *pf __unused, char *ifname __unused)
{
        fprintf(stderr, "set loginterface not supported in authpf\n");
        return (1);
}

int
pfctl_set_hostid(struct pfctl *pf __unused, u_int32_t hostid __unused)
{
        fprintf(stderr, "set hostid not supported in authpf\n");
        return (1);
}

int
pfctl_set_timeout(struct pfctl *pf __unused, const char *opt __unused,
                  int seconds __unused, int quiet __unused)
{
        fprintf(stderr, "set timeout not supported in authpf\n");
        return (1);
}

int
pfctl_set_limit(struct pfctl *pf __unused, const char *opt __unused,
                unsigned int limit __unused)
{
        fprintf(stderr, "set limit not supported in authpf\n");
        return (1);
}

int
pfctl_set_debug(struct pfctl *pf __unused, char *d __unused)
{
        fprintf(stderr, "set debug not supported in authpf\n");
        return (1);
}

int
pfctl_define_table(char *name __unused, int flags __unused, int addrs __unused,
                   const char *anchor __unused, const char *ruleset __unused,
                   struct pfr_buffer *ab __unused, u_int32_t ticket __unused)
{
        fprintf(stderr, "table definitions not yet supported in authpf\n");
        return (1);
}

int
pfctl_rules(int dev __unused, char *filename __unused, int opts __unused,
            char *my_anchorname __unused, char *my_rulesetname __unused,
            struct pfr_buffer *t __unused)
{
        /* never called, no anchors inside anchors, but we need the stub */
        fprintf(stderr, "load anchor not supported from authpf\n");
        return (1);
}

void
pfctl_print_title(const char *title __unused)
{
}