a1dc209638
administrator to define certain properties of new devfs nodes before they become visible to the userland. Both static (e.g., /dev/speaker) and dynamic (e.g., /dev/bpf*, some removable devices) nodes are supported. Each DEVFS mount may have a different ruleset assigned to it, permitting different policies to be implemented for things like jails. Approved by: phk
420 lines
9.6 KiB
C
420 lines
9.6 KiB
C
/*-
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* Copyright (c) 2002 Dima Dorfman.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Rule subsystem manipulation.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/ioctl.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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static void rulespec_intok(struct devfs_rule *dr, int ac, char **av,
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devfs_rsnum rsnum);
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static void rulespec_outfp(FILE *fp, struct devfs_rule *dr);
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static command_t rule_add, rule_apply, rule_applyset;
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static command_t rule_del, rule_delset, rule_show, rule_showsets;
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static ctbl_t ctbl_rule = {
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{ "add", rule_add },
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{ "apply", rule_apply },
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{ "applyset", rule_applyset },
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{ "del", rule_del },
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{ "delset", rule_delset },
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{ "show", rule_show },
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{ "showsets", rule_showsets },
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{ NULL, NULL }
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};
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static struct intstr ist_type[] = {
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{ "disk", D_DISK },
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{ "mem", D_MEM },
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{ "tape", D_TAPE },
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{ "tty", D_TTY },
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{ NULL, -1 }
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};
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devfs_rsnum in_rsnum;
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int
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rule_main(int ac, char **av)
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{
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struct cmd *c;
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char ch;
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setprogname("devfs rule");
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optreset = optind = 1;
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while ((ch = getopt(ac, av, "s:")) != -1)
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switch (ch) {
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case 's':
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in_rsnum = eatonum(optarg);
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break;
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default:
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usage();
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}
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ac -= optind;
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av += optind;
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if (ac < 1)
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usage();
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for (c = ctbl_rule; c->name != NULL; ++c)
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if (strcmp(c->name, av[0]) == 0)
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exit((*c->handler)(ac, av));
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errx(1, "unknown command: %s", av[0]);
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}
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static int
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rule_add(int ac, char **av)
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{
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struct devfs_rule dr;
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int rv;
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if (ac < 2)
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usage();
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rulespec_intok(&dr, ac - 1, av + 1, in_rsnum);
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rv = ioctl(mpfd, DEVFSIO_RADD, &dr);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_RADD");
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return (0);
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}
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static int
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rule_apply(int ac __unused, char **av __unused)
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{
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struct devfs_rule dr;
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devfs_rnum rnum;
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devfs_rid rid;
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int rv;
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if (ac < 2)
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usage();
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if (!atonum(av[1], &rnum)) {
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rulespec_intok(&dr, ac - 1, av + 1, in_rsnum);
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rv = ioctl(mpfd, DEVFSIO_RAPPLY, &dr);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_RAPPLY");
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} else {
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rid = mkrid(in_rsnum, rnum);
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rv = ioctl(mpfd, DEVFSIO_RAPPLYID, &rid);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_RAPPLYID");
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}
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return (0);
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}
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static int
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rule_applyset(int ac, char **av __unused)
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{
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int rv;
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if (ac != 1)
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usage();
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rv = ioctl(mpfd, DEVFSIO_SAPPLY, &in_rsnum);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_SAPPLY");
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return (0);
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}
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static int
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rule_del(int ac __unused, char **av)
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{
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devfs_rid rid;
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int rv;
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if (av[1] == NULL)
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usage();
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rid = mkrid(in_rsnum, eatoi(av[1]));
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rv = ioctl(mpfd, DEVFSIO_RDEL, &rid);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_RDEL");
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return (0);
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}
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static int
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rule_delset(int ac, char **av __unused)
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{
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struct devfs_rule dr;
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int rv;
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if (ac != 1)
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usage();
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memset(&dr, '\0', sizeof(dr));
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dr.dr_magic = DEVFS_MAGIC;
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dr.dr_id = mkrid(in_rsnum, 0);
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while (ioctl(mpfd, DEVFSIO_RGETNEXT, &dr) != -1) {
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rv = ioctl(mpfd, DEVFSIO_RDEL, &dr.dr_id);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_RDEL");
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}
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if (errno != ENOENT)
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err(1, "ioctl DEVFSIO_RGETNEXT");
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return (0);
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}
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static int
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rule_show(int ac __unused, char **av)
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{
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struct devfs_rule dr;
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devfs_rnum rnum;
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int rv;
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memset(&dr, '\0', sizeof(dr));
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dr.dr_magic = DEVFS_MAGIC;
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if (av[1] != NULL) {
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rnum = eatoi(av[1]);
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dr.dr_id = mkrid(in_rsnum, rnum - 1);
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rv = ioctl(mpfd, DEVFSIO_RGETNEXT, &dr);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_RGETNEXT");
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if (rid2rn(dr.dr_id) == rnum)
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rulespec_outfp(stdout, &dr);
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} else {
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dr.dr_id = mkrid(in_rsnum, 0);
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while (ioctl(mpfd, DEVFSIO_RGETNEXT, &dr) != -1)
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rulespec_outfp(stdout, &dr);
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if (errno != ENOENT)
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err(1, "ioctl DEVFSIO_RGETNEXT");
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}
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return (0);
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}
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static int
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rule_showsets(int ac, char **av __unused)
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{
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devfs_rsnum rsnum;
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if (ac != 1)
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usage();
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rsnum = 0;
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while (ioctl(mpfd, DEVFSIO_SGETNEXT, &rsnum) != -1)
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printf("%d\n", rsnum);
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if (errno != ENOENT)
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err(1, "ioctl DEVFSIO_SGETNEXT");
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return (0);
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}
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int
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ruleset_main(int ac, char **av)
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{
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devfs_rsnum rsnum;
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int rv;
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setprogname("devfs ruleset");
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if (ac < 2)
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usage();
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rsnum = eatonum(av[1]);
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rv = ioctl(mpfd, DEVFSIO_SUSE, &rsnum);
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if (rv == -1)
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err(1, "ioctl DEVFSIO_SUSE");
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return (0);
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}
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/*
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* Construct a /struct devfs_rule/ from ac and av.
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*/
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static void
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rulespec_intok(struct devfs_rule *dr, int ac __unused, char **av,
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devfs_rsnum rsnum)
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{
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struct intstr *is;
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struct passwd *pw;
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struct group *gr;
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devfs_rnum rnum;
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char *cp;
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long l;
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memset(dr, '\0', sizeof(*dr));
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/*
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* We don't maintain ac hereinafter.
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*/
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if (av[0] == NULL)
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errx(1, "unexpected end of rulespec");
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/* If the first argument is an integer, treat it as a rule number. */
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if (!atonum(av[0], &rnum))
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rnum = 0; /* auto-number */
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else
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++av;
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/*
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* These aren't table-driven since that would result in more
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* tiny functions than I care to deal with.
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*/
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for (;;) {
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if (av[0] == NULL)
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break;
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else if (strcmp(av[0], "type") == 0) {
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if (av[1] == NULL)
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errx(1, "expecting argument for type");
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for (is = ist_type; is->s != NULL; ++is)
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if (strcmp(av[1], is->s) == 0) {
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dr->dr_dswflags |= is->i;
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break;
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}
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if (is->s == NULL)
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errx(1, "unknown type: %s", av[1]);
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dr->dr_icond |= DRC_DSWFLAGS;
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av += 2;
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} else if (strcmp(av[0], "path") == 0) {
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if (av[1] == NULL)
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errx(1, "expecting argument for path");
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if (strlcpy(dr->dr_pathptrn, av[1], DEVFS_MAXPTRNLEN)
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>= DEVFS_MAXPTRNLEN)
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warnx("pattern specified too long; truncated");
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dr->dr_icond |= DRC_PATHPTRN;
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av += 2;
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} else if (strcmp(av[0], "major") == 0) {
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if (av[1] == NULL)
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errx(1, "expecting argument for major");
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dr->dr_major = eatoi(av[1]);
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dr->dr_icond |= DRC_MAJOR;
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av += 2;
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} else
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break;
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}
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for (;;) {
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if (av[0] == NULL)
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break;
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else if (strcmp(av[0], "hide") == 0) {
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dr->dr_iacts |= DRA_BACTS;
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dr->dr_bacts |= DRB_HIDE;
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++av;
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} else if (strcmp(av[0], "unhide") == 0) {
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dr->dr_iacts |= DRA_BACTS;
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dr->dr_bacts |= DRB_UNHIDE;
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++av;
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} else if (strcmp(av[0], "user") == 0) {
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if (av[1] == NULL)
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errx(1, "expecting argument for user");
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dr->dr_iacts |= DRA_UID;
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pw = getpwnam(av[1]);
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if (pw != NULL)
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dr->dr_uid = pw->pw_uid;
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else
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dr->dr_uid = eatoi(av[1]); /* XXX overflow */
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av += 2;
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} else if (strcmp(av[0], "group") == 0) {
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if (av[1] == NULL)
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errx(1, "expecting argument for group");
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dr->dr_iacts |= DRA_GID;
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gr = getgrnam(av[1]);
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if (gr != NULL)
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dr->dr_gid = gr->gr_gid;
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else
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dr->dr_gid = eatoi(av[1]); /* XXX overflow */
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av += 2;
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} else if (strcmp(av[0], "mode") == 0) {
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if (av[1] == NULL)
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errx(1, "expecting argument for mode");
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dr->dr_iacts |= DRA_MODE;
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l = strtol(av[1], &cp, 8);
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if (l > (1 << (sizeof(dr->dr_mode) * 8)) - 1 ||
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*cp != '\0')
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errx(1, "invalid mode: %s", av[1]);
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dr->dr_mode = l;
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av += 2;
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} else if (strcmp(av[0], "include") == 0) {
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if (av[1] == NULL)
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errx(1, "expecting argument for include");
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dr->dr_iacts |= DRA_INCSET;
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dr->dr_incset = eatonum(av[1]);
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av += 2;
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} else
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errx(1, "unknown argument: %s", av[0]);
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}
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dr->dr_id = mkrid(rsnum, rnum);
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dr->dr_magic = DEVFS_MAGIC;
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}
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/*
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* Write a human-readable (and machine-parsable, by rulespec_in*())
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* representation of dr to bufp. *bufp should be free(3)'d when the
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* caller is finished with it.
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*/
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static void
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rulespec_outfp(FILE *fp, struct devfs_rule *dr)
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{
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struct intstr *is;
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struct passwd *pw;
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struct group *gr;
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fprintf(fp, "%d", rid2rn(dr->dr_id));
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if (dr->dr_icond & DRC_DSWFLAGS)
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for (is = ist_type; is->s != NULL; ++is)
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if (dr->dr_dswflags & is->i)
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fprintf(fp, " type %s", is->s);
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if (dr->dr_icond & DRC_PATHPTRN)
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fprintf(fp, " path %s", dr->dr_pathptrn);
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if (dr->dr_icond & DRC_MAJOR)
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fprintf(fp, " major %d", dr->dr_major);
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if (dr->dr_iacts & DRA_BACTS) {
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if (dr->dr_bacts & DRB_HIDE)
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fprintf(fp, " hide");
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if (dr->dr_bacts & DRB_UNHIDE)
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fprintf(fp, " unhide");
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}
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if (dr->dr_iacts & DRA_UID) {
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pw = getpwuid(dr->dr_uid);
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if (pw == NULL)
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fprintf(fp, " user %d", dr->dr_uid);
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else
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fprintf(fp, " user %s", pw->pw_name);
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}
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if (dr->dr_iacts & DRA_GID) {
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gr = getgrgid(dr->dr_gid);
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if (gr == NULL)
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fprintf(fp, " group %d", dr->dr_gid);
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else
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fprintf(fp, " group %s", gr->gr_name);
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}
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if (dr->dr_iacts & DRA_MODE)
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fprintf(fp, " mode %o", dr->dr_mode);
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if (dr->dr_iacts & DRA_INCSET)
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fprintf(fp, " include %d", dr->dr_incset);
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fprintf(fp, "\n");
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}
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