f3a133a1c3
parameter unless a (numeric) IPv6 address is given. Even the default binaries built with -DINET6 will work with IPv6-less kernels. With an eye to the future, similarly handle the possibility of an IPv4-less kernel. Approved by: re (kib), bz (mentor)
558 lines
13 KiB
C
558 lines
13 KiB
C
/*-
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* Copyright (c) 1999 Poul-Henning Kamp.
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* Copyright (c) 2009 James Gritton
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <ctype.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 <jail.h>
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#include <login_cap.h>
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#include <netdb.h>
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#include <paths.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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static struct jailparam *params;
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static char **param_values;
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static int nparams;
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static char *ip4_addr;
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#ifdef INET6
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static char *ip6_addr;
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#endif
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static void add_ip_addr(char **addrp, char *newaddr);
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#ifdef INET6
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static void add_ip_addr46(char *newaddr);
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#endif
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static void add_ip_addrinfo(int ai_flags, char *value);
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static void quoted_print(FILE *fp, char *str);
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static void set_param(const char *name, char *value);
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static void usage(void);
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static const char *perm_sysctl[][3] = {
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{ "security.jail.set_hostname_allowed",
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"allow.noset_hostname", "allow.set_hostname" },
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{ "security.jail.sysvipc_allowed",
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"allow.nosysvipc", "allow.sysvipc" },
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{ "security.jail.allow_raw_sockets",
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"allow.noraw_sockets", "allow.raw_sockets" },
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{ "security.jail.chflags_allowed",
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"allow.nochflags", "allow.chflags" },
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{ "security.jail.mount_allowed",
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"allow.nomount", "allow.mount" },
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{ "security.jail.socket_unixiproute_only",
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"allow.socket_af", "allow.nosocket_af" },
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};
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extern char **environ;
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#define GET_USER_INFO do { \
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pwd = getpwnam(username); \
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if (pwd == NULL) { \
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if (errno) \
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err(1, "getpwnam: %s", username); \
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else \
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errx(1, "%s: no such user", username); \
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} \
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lcap = login_getpwclass(pwd); \
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if (lcap == NULL) \
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err(1, "getpwclass: %s", username); \
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ngroups = ngroups_max; \
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if (getgrouplist(username, pwd->pw_gid, groups, &ngroups) != 0) \
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err(1, "getgrouplist: %s", username); \
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} while (0)
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int
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main(int argc, char **argv)
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{
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login_cap_t *lcap = NULL;
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struct passwd *pwd = NULL;
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gid_t *groups;
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size_t sysvallen;
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int ch, cmdarg, i, jail_set_flags, jid, ngroups, sysval;
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int hflag, iflag, Jflag, lflag, rflag, uflag, Uflag;
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long ngroups_max;
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unsigned pi;
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char *jailname, *securelevel, *username, *JidFile;
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char enforce_statfs[4];
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static char *cleanenv;
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const char *shell, *p = NULL;
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FILE *fp;
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hflag = iflag = Jflag = lflag = rflag = uflag = Uflag =
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jail_set_flags = 0;
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cmdarg = jid = -1;
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jailname = securelevel = username = JidFile = cleanenv = NULL;
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fp = NULL;
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ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
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if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
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err(1, "malloc");
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while ((ch = getopt(argc, argv, "cdhilmn:r:s:u:U:J:")) != -1) {
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switch (ch) {
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case 'd':
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jail_set_flags |= JAIL_DYING;
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break;
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case 'h':
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hflag = 1;
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break;
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case 'i':
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iflag = 1;
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break;
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case 'J':
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JidFile = optarg;
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Jflag = 1;
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break;
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case 'n':
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jailname = optarg;
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break;
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case 's':
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securelevel = optarg;
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break;
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case 'u':
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username = optarg;
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uflag = 1;
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break;
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case 'U':
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username = optarg;
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Uflag = 1;
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break;
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case 'l':
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lflag = 1;
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break;
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case 'c':
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jail_set_flags |= JAIL_CREATE;
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break;
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case 'm':
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jail_set_flags |= JAIL_UPDATE;
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break;
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case 'r':
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jid = jail_getid(optarg);
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if (jid < 0)
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errx(1, "%s", jail_errmsg);
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rflag = 1;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (rflag) {
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if (argc > 0 || iflag || Jflag || lflag || uflag || Uflag)
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usage();
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if (jail_remove(jid) < 0)
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err(1, "jail_remove");
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exit (0);
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}
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if (argc == 0)
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usage();
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if (uflag && Uflag)
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usage();
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if (lflag && username == NULL)
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usage();
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if (uflag)
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GET_USER_INFO;
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if (jailname)
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set_param("name", jailname);
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if (securelevel)
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set_param("securelevel", securelevel);
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if (jail_set_flags) {
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for (i = 0; i < argc; i++) {
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if (!strncmp(argv[i], "command=", 8)) {
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cmdarg = i;
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argv[cmdarg] += 8;
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jail_set_flags |= JAIL_ATTACH;
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break;
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}
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if (hflag) {
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if (!strncmp(argv[i], "ip4.addr=", 9)) {
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add_ip_addr(&ip4_addr, argv[i] + 9);
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break;
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}
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#ifdef INET6
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if (!strncmp(argv[i], "ip6.addr=", 9)) {
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add_ip_addr(&ip6_addr, argv[i] + 9);
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break;
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}
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#endif
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if (!strncmp(argv[i], "host.hostname=", 14))
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add_ip_addrinfo(0, argv[i] + 14);
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}
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set_param(NULL, argv[i]);
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}
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} else {
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if (argc < 4 || argv[0][0] != '/')
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errx(1, "%s\n%s",
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"no -c or -m, so this must be an old-style command.",
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"But it doesn't look like one.");
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set_param("path", argv[0]);
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set_param("host.hostname", argv[1]);
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if (hflag)
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add_ip_addrinfo(0, argv[1]);
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if (argv[2][0] != '\0')
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#ifdef INET6
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add_ip_addr46(argv[2]);
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#else
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add_ip_addr(&ip4_addr, argv[2]);
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#endif
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cmdarg = 3;
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/* Emulate the defaults from security.jail.* sysctls */
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sysvallen = sizeof(sysval);
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if (sysctlbyname("security.jail.jailed", &sysval, &sysvallen,
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NULL, 0) == 0 && sysval == 0) {
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for (pi = 0; pi < sizeof(perm_sysctl) /
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sizeof(perm_sysctl[0]); pi++) {
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sysvallen = sizeof(sysval);
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if (sysctlbyname(perm_sysctl[pi][0],
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&sysval, &sysvallen, NULL, 0) == 0)
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set_param(perm_sysctl[pi]
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[sysval ? 2 : 1], NULL);
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}
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sysvallen = sizeof(sysval);
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if (sysctlbyname("security.jail.enforce_statfs",
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&sysval, &sysvallen, NULL, 0) == 0) {
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snprintf(enforce_statfs,
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sizeof(enforce_statfs), "%d", sysval);
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set_param("enforce_statfs", enforce_statfs);
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}
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}
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}
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if (ip4_addr != NULL)
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set_param("ip4.addr", ip4_addr);
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#ifdef INET6
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if (ip6_addr != NULL)
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set_param("ip6.addr", ip6_addr);
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#endif
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if (Jflag) {
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fp = fopen(JidFile, "w");
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if (fp == NULL)
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errx(1, "Could not create JidFile: %s", JidFile);
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}
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jid = jailparam_set(params, nparams,
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jail_set_flags ? jail_set_flags : JAIL_CREATE | JAIL_ATTACH);
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if (jid < 0)
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errx(1, "%s", jail_errmsg);
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if (iflag) {
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printf("%d\n", jid);
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fflush(stdout);
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}
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if (Jflag) {
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if (jail_set_flags) {
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fprintf(fp, "jid=%d", jid);
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for (i = 0; i < nparams; i++)
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if (strcmp(params[i].jp_name, "jid")) {
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fprintf(fp, " %s",
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(char *)params[i].jp_name);
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if (param_values[i]) {
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putc('=', fp);
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quoted_print(fp,
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param_values[i]);
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}
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}
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fprintf(fp, "\n");
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} else {
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for (i = 0; i < nparams; i++)
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if (!strcmp(params[i].jp_name, "path"))
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break;
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#ifdef INET6
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fprintf(fp, "%d\t%s\t%s\t%s%s%s\t%s\n",
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jid, i < nparams
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? (char *)params[i].jp_value : argv[0],
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argv[1], ip4_addr ? ip4_addr : "",
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ip4_addr && ip4_addr[0] && ip6_addr && ip6_addr[0]
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? "," : "", ip6_addr ? ip6_addr : "", argv[3]);
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#else
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fprintf(fp, "%d\t%s\t%s\t%s\t%s\n",
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jid, i < nparams
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? (char *)params[i].jp_value : argv[0],
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argv[1], ip4_addr ? ip4_addr : "", argv[3]);
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#endif
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}
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(void)fclose(fp);
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}
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if (cmdarg < 0)
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exit(0);
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if (username != NULL) {
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if (Uflag)
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GET_USER_INFO;
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if (lflag) {
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p = getenv("TERM");
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environ = &cleanenv;
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}
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if (setgroups(ngroups, groups) != 0)
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err(1, "setgroups");
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if (setgid(pwd->pw_gid) != 0)
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err(1, "setgid");
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if (setusercontext(lcap, pwd, pwd->pw_uid,
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LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN) != 0)
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err(1, "setusercontext");
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login_close(lcap);
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}
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if (lflag) {
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if (*pwd->pw_shell)
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shell = pwd->pw_shell;
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else
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shell = _PATH_BSHELL;
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if (chdir(pwd->pw_dir) < 0)
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errx(1, "no home directory");
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setenv("HOME", pwd->pw_dir, 1);
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setenv("SHELL", shell, 1);
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setenv("USER", pwd->pw_name, 1);
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if (p)
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setenv("TERM", p, 1);
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}
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execvp(argv[cmdarg], argv + cmdarg);
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err(1, "execvp: %s", argv[cmdarg]);
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}
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static void
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add_ip_addr(char **addrp, char *value)
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{
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int addrlen;
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char *addr;
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if (!*addrp) {
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*addrp = strdup(value);
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if (!*addrp)
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err(1, "malloc");
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} else if (value[0]) {
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addrlen = strlen(*addrp) + strlen(value) + 2;
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addr = malloc(addrlen);
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if (!addr)
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err(1, "malloc");
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snprintf(addr, addrlen, "%s,%s", *addrp, value);
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free(*addrp);
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*addrp = addr;
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}
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}
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#ifdef INET6
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static void
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add_ip_addr46(char *value)
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{
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char *p, *np;
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for (p = value;; p = np + 1)
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{
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np = strchr(p, ',');
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if (np)
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*np = '\0';
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add_ip_addrinfo(AI_NUMERICHOST, p);
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if (!np)
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break;
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}
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}
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#endif
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static void
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add_ip_addrinfo(int ai_flags, char *value)
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{
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struct addrinfo hints, *ai0, *ai;
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struct in_addr addr4;
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size_t size;
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int error, ip4ok;
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int mib[4];
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char avalue4[INET_ADDRSTRLEN];
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#ifdef INET6
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struct in6_addr addr6;
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int ip6ok;
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char avalue6[INET6_ADDRSTRLEN];
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#endif
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/* Look up the hostname (or get the address) */
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_STREAM;
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#ifdef INET6
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hints.ai_family = PF_UNSPEC;
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#else
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hints.ai_family = PF_INET;
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#endif
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hints.ai_flags = ai_flags;
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error = getaddrinfo(value, NULL, &hints, &ai0);
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if (error != 0)
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errx(1, "hostname %s: %s", value, gai_strerror(error));
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/*
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* Silently ignore unsupported address families from DNS lookups.
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* But if this is a numeric address, let the kernel give the error.
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*/
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if (ai_flags & AI_NUMERICHOST)
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ip4ok =
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#ifdef INET6
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ip6ok =
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#endif
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1;
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else {
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size = 4;
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ip4ok = (sysctlnametomib("security.jail.param.ip4", mib,
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&size) == 0);
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#ifdef INET6
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size = 4;
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ip6ok = (sysctlnametomib("security.jail.param.ip6", mib,
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&size) == 0);
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#endif
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}
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/* Convert the addresses to ASCII so set_param can convert them back. */
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for (ai = ai0; ai; ai = ai->ai_next)
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switch (ai->ai_family) {
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case AF_INET:
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if (!ip4ok)
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break;
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memcpy(&addr4, &((struct sockaddr_in *)
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(void *)ai->ai_addr)->sin_addr, sizeof(addr4));
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if (inet_ntop(AF_INET, &addr4, avalue4,
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INET_ADDRSTRLEN) == NULL)
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err(1, "inet_ntop");
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add_ip_addr(&ip4_addr, avalue4);
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break;
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#ifdef INET6
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case AF_INET6:
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if (!ip6ok)
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break;
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memcpy(&addr6, &((struct sockaddr_in6 *)
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(void *)ai->ai_addr)->sin6_addr, sizeof(addr6));
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if (inet_ntop(AF_INET6, &addr6, avalue6,
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INET6_ADDRSTRLEN) == NULL)
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err(1, "inet_ntop");
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add_ip_addr(&ip6_addr, avalue6);
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break;
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#endif
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}
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freeaddrinfo(ai0);
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}
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|
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static void
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quoted_print(FILE *fp, char *str)
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{
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int c, qc;
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char *p = str;
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/* An empty string needs quoting. */
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if (!*p) {
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fputs("\"\"", fp);
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return;
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}
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/*
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* The value will be surrounded by quotes if it contains spaces
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* or quotes.
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|
*/
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qc = strchr(p, '\'') ? '"'
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: strchr(p, '"') ? '\''
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: strchr(p, ' ') || strchr(p, '\t') ? '"'
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: 0;
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if (qc)
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putc(qc, fp);
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while ((c = *p++)) {
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if (c == '\\' || c == qc)
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putc('\\', fp);
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putc(c, fp);
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}
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if (qc)
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putc(qc, fp);
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}
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|
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static void
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set_param(const char *name, char *value)
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|
{
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struct jailparam *param;
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int i;
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static int paramlistsize;
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|
|
/* Separate the name from the value, if not done already. */
|
|
if (name == NULL) {
|
|
name = value;
|
|
if ((value = strchr(value, '=')))
|
|
*value++ = '\0';
|
|
}
|
|
|
|
/* Check for repeat parameters */
|
|
for (i = 0; i < nparams; i++)
|
|
if (!strcmp(name, params[i].jp_name)) {
|
|
jailparam_free(params + i, 1);
|
|
memcpy(params + i, params + i + 1,
|
|
(--nparams - i) * sizeof(struct jailparam));
|
|
break;
|
|
}
|
|
|
|
/* Make sure there is room for the new param record. */
|
|
if (!nparams) {
|
|
paramlistsize = 32;
|
|
params = malloc(paramlistsize * sizeof(*params));
|
|
param_values = malloc(paramlistsize * sizeof(*param_values));
|
|
if (params == NULL || param_values == NULL)
|
|
err(1, "malloc");
|
|
} else if (nparams >= paramlistsize) {
|
|
paramlistsize *= 2;
|
|
params = realloc(params, paramlistsize * sizeof(*params));
|
|
param_values = realloc(param_values,
|
|
paramlistsize * sizeof(*param_values));
|
|
if (params == NULL)
|
|
err(1, "realloc");
|
|
}
|
|
|
|
/* Look up the paramter. */
|
|
param_values[nparams] = value;
|
|
param = params + nparams++;
|
|
if (jailparam_init(param, name) < 0 ||
|
|
jailparam_import(param, value) < 0)
|
|
errx(1, "%s", jail_errmsg);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
(void)fprintf(stderr,
|
|
"usage: jail [-d] [-h] [-i] [-J jid_file] "
|
|
"[-l -u username | -U username]\n"
|
|
" [-c | -m] param=value ... [command=command ...]\n"
|
|
" jail [-r jail]\n");
|
|
exit(1);
|
|
}
|