430 lines
10 KiB
C
430 lines
10 KiB
C
/*-
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* Copyright (c) 1999 Poul-Henning Kamp.
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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/queue.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.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 <login_cap.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 <strings.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void);
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static int add_addresses(struct addrinfo *);
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static struct in_addr *copy_addr4(void);
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#ifdef INET6
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static struct in6_addr *copy_addr6(void);
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#endif
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extern char **environ;
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struct addr4entry {
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STAILQ_ENTRY(addr4entry) addr4entries;
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struct in_addr ip4;
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int count;
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};
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struct addr6entry {
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STAILQ_ENTRY(addr6entry) addr6entries;
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#ifdef INET6
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struct in6_addr ip6;
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#endif
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int count;
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};
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STAILQ_HEAD(addr4head, addr4entry) addr4 = STAILQ_HEAD_INITIALIZER(addr4);
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STAILQ_HEAD(addr6head, addr6entry) addr6 = STAILQ_HEAD_INITIALIZER(addr6);
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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; \
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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 jail j;
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struct passwd *pwd = NULL;
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gid_t groups[NGROUPS];
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int ch, error, i, ngroups, securelevel;
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int hflag, iflag, Jflag, lflag, uflag, Uflag;
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char path[PATH_MAX], *jailname, *ep, *username, *JidFile, *ip;
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static char *cleanenv;
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const char *shell, *p = NULL;
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long ltmp;
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FILE *fp;
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struct addrinfo hints, *res0;
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hflag = iflag = Jflag = lflag = uflag = Uflag = 0;
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securelevel = -1;
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jailname = username = JidFile = cleanenv = NULL;
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fp = NULL;
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while ((ch = getopt(argc, argv, "hiln:s:u:U:J:")) != -1) {
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switch (ch) {
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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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ltmp = strtol(optarg, &ep, 0);
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if (*ep || ep == optarg || ltmp > INT_MAX || !ltmp)
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errx(1, "invalid securelevel: `%s'", optarg);
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securelevel = ltmp;
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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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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 (argc < 4)
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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 (realpath(argv[0], path) == NULL)
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err(1, "realpath: %s", argv[0]);
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if (chdir(path) != 0)
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err(1, "chdir: %s", path);
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/* Initialize struct jail. */
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memset(&j, 0, sizeof(j));
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j.version = JAIL_API_VERSION;
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j.path = path;
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j.hostname = argv[1];
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if (jailname != NULL)
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j.jailname = jailname;
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/* Handle IP addresses. If requested resolve hostname too. */
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bzero(&hints, sizeof(struct addrinfo));
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hints.ai_protocol = IPPROTO_TCP;
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hints.ai_socktype = SOCK_STREAM;
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if (JAIL_API_VERSION < 2)
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hints.ai_family = PF_INET;
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else
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hints.ai_family = PF_UNSPEC;
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/* Handle hostname. */
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if (hflag != 0) {
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error = getaddrinfo(j.hostname, NULL, &hints, &res0);
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if (error != 0)
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errx(1, "failed to handle hostname: %s",
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gai_strerror(error));
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error = add_addresses(res0);
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freeaddrinfo(res0);
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if (error != 0)
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errx(1, "failed to add addresses.");
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}
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/* Handle IP addresses. */
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hints.ai_flags = AI_NUMERICHOST;
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ip = strtok(argv[2], ",");
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while (ip != NULL) {
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error = getaddrinfo(ip, NULL, &hints, &res0);
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if (error != 0)
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errx(1, "failed to handle ip: %s", gai_strerror(error));
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error = add_addresses(res0);
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freeaddrinfo(res0);
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if (error != 0)
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errx(1, "failed to add addresses.");
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ip = strtok(NULL, ",");
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}
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/* Count IP addresses and add them to struct jail. */
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if (!STAILQ_EMPTY(&addr4)) {
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j.ip4s = STAILQ_FIRST(&addr4)->count;
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j.ip4 = copy_addr4();
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if (j.ip4s > 0 && j.ip4 == NULL)
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errx(1, "copy_addr4()");
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}
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#ifdef INET6
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if (!STAILQ_EMPTY(&addr6)) {
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j.ip6s = STAILQ_FIRST(&addr6)->count;
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j.ip6 = copy_addr6();
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if (j.ip6s > 0 && j.ip6 == NULL)
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errx(1, "copy_addr6()");
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}
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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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i = jail(&j);
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if (i == -1)
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err(1, "syscall failed with");
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if (iflag) {
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printf("%d\n", i);
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fflush(stdout);
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}
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if (Jflag) {
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if (fp != NULL) {
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fprintf(fp, "%d\t%s\t%s\t%s\t%s\n",
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i, j.path, j.hostname, argv[2], argv[3]);
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(void)fclose(fp);
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} else {
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errx(1, "Could not write JidFile: %s", JidFile);
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}
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}
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if (securelevel > 0) {
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if (sysctlbyname("kern.securelevel", NULL, 0, &securelevel,
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sizeof(securelevel)))
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err(1, "Can not set securelevel to %d", securelevel);
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}
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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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if (execv(argv[3], argv + 3) != 0)
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err(1, "execv: %s", argv[3]);
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "%s%s%s\n",
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"usage: jail [-hi] [-n jailname] [-J jid_file] ",
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"[-s securelevel] [-l -u username | -U username] ",
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"path hostname [ip[,..]] command ...");
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exit(1);
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}
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static int
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add_addresses(struct addrinfo *res0)
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{
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int error;
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struct addrinfo *res;
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struct addr4entry *a4p;
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struct sockaddr_in *sai;
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#ifdef INET6
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struct addr6entry *a6p;
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struct sockaddr_in6 *sai6;
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#endif
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int count;
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error = 0;
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for (res = res0; res && error == 0; res = res->ai_next) {
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switch (res->ai_family) {
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case AF_INET:
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sai = (struct sockaddr_in *)(void *)res->ai_addr;
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STAILQ_FOREACH(a4p, &addr4, addr4entries) {
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if (bcmp(&sai->sin_addr, &a4p->ip4,
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sizeof(struct in_addr)) == 0) {
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err(1, "Ignoring duplicate IPv4 address.");
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break;
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}
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}
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a4p = (struct addr4entry *) malloc(
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sizeof(struct addr4entry));
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if (a4p == NULL) {
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error = 1;
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break;
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}
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bzero(a4p, sizeof(struct addr4entry));
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bcopy(&sai->sin_addr, &a4p->ip4,
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sizeof(struct in_addr));
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if (!STAILQ_EMPTY(&addr4))
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count = STAILQ_FIRST(&addr4)->count;
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else
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count = 0;
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STAILQ_INSERT_TAIL(&addr4, a4p, addr4entries);
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STAILQ_FIRST(&addr4)->count = count + 1;
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break;
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#ifdef INET6
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case AF_INET6:
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sai6 = (struct sockaddr_in6 *)(void *)res->ai_addr;
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STAILQ_FOREACH(a6p, &addr6, addr6entries) {
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if (bcmp(&sai6->sin6_addr, &a6p->ip6,
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sizeof(struct in6_addr)) == 0) {
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err(1, "Ignoring duplicate IPv6 address.");
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break;
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}
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}
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a6p = (struct addr6entry *) malloc(
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sizeof(struct addr6entry));
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if (a6p == NULL) {
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error = 1;
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break;
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}
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bzero(a6p, sizeof(struct addr6entry));
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bcopy(&sai6->sin6_addr, &a6p->ip6,
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sizeof(struct in6_addr));
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if (!STAILQ_EMPTY(&addr6))
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count = STAILQ_FIRST(&addr6)->count;
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else
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count = 0;
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STAILQ_INSERT_TAIL(&addr6, a6p, addr6entries);
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STAILQ_FIRST(&addr6)->count = count + 1;
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break;
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#endif
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default:
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err(1, "Address family %d not supported. Ignoring.\n",
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res->ai_family);
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break;
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}
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}
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return (error);
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}
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static struct in_addr *
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copy_addr4(void)
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{
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size_t len;
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struct in_addr *ip4s, *p, ia;
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struct addr4entry *a4p;
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if (STAILQ_EMPTY(&addr4))
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return NULL;
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len = STAILQ_FIRST(&addr4)->count * sizeof(struct in_addr);
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ip4s = p = (struct in_addr *)malloc(len);
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if (ip4s == NULL)
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return (NULL);
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bzero(p, len);
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while (!STAILQ_EMPTY(&addr4)) {
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a4p = STAILQ_FIRST(&addr4);
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STAILQ_REMOVE_HEAD(&addr4, addr4entries);
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ia.s_addr = a4p->ip4.s_addr;
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bcopy(&ia, p, sizeof(struct in_addr));
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p++;
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free(a4p);
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}
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return (ip4s);
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}
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#ifdef INET6
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static struct in6_addr *
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copy_addr6(void)
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{
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size_t len;
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struct in6_addr *ip6s, *p;
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struct addr6entry *a6p;
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if (STAILQ_EMPTY(&addr6))
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return NULL;
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len = STAILQ_FIRST(&addr6)->count * sizeof(struct in6_addr);
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ip6s = p = (struct in6_addr *)malloc(len);
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if (ip6s == NULL)
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return (NULL);
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bzero(p, len);
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while (!STAILQ_EMPTY(&addr6)) {
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a6p = STAILQ_FIRST(&addr6);
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STAILQ_REMOVE_HEAD(&addr6, addr6entries);
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bcopy(&a6p->ip6, p, sizeof(struct in6_addr));
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p++;
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free(a6p);
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}
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return (ip6s);
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}
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#endif
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