669 lines
17 KiB
C
669 lines
17 KiB
C
/*-
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* Copyright (c) 2010 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/types.h>
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#include <sys/event.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <kvm.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 <signal.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 "jailp.h"
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#define COMSTRING_DUMMY ((struct cfstring *)1)
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#define DEFAULT_STOP_TIMEOUT 10
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#define PHASH_SIZE 256
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LIST_HEAD(phhead, phash);
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struct phash {
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LIST_ENTRY(phash) le;
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struct cfjail *j;
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pid_t pid;
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};
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extern char **environ;
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static int get_user_info(struct cfjail *j, const char *username,
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const struct passwd **pwdp, login_cap_t **lcapp);
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static void add_proc(struct cfjail *j, pid_t pid);
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static void clear_procs(struct cfjail *j);
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static struct cfjail *find_proc(pid_t pid);
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static struct cfjails sleeping = TAILQ_HEAD_INITIALIZER(sleeping);
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static struct cfjails runnable = TAILQ_HEAD_INITIALIZER(runnable);
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static struct phhead phash[PHASH_SIZE];
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static int kq;
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/*
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* Run a command associated with a jail, possibly inside the jail.
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*/
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int
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run_command(struct cfjail *j, int *plimit, enum intparam comparam)
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{
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const struct passwd *pwd;
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struct cfstring *comstring, *s;
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login_cap_t *lcap;
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char **argv;
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char *cs, *addr, *comcs;
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const char *jidstr, *conslog, *path, *ruleset, *term, *username;
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size_t comlen;
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pid_t pid;
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int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout;
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static char *cleanenv;
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if (comparam) {
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if (comparam == IP_MOUNT_DEVFS
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? !bool_param(j->intparams[IP_MOUNT_DEVFS])
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: j->intparams[comparam] == NULL)
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return 0;
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j->comparam = comparam;
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j->comstring = comparam == IP_MOUNT_DEVFS ? COMSTRING_DUMMY
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: STAILQ_FIRST(&j->intparams[comparam]->val);
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} else {
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comparam = j->comparam;
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if (!(j->flags & JF_RUNQ))
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j->comstring = j->comstring == COMSTRING_DUMMY
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? NULL : STAILQ_NEXT(j->comstring, tq);
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}
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comstring = j->comstring;
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if (comstring == NULL ||
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(comstring != COMSTRING_DUMMY && comstring->len == 0))
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return 0;
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if (plimit && *plimit == 0) {
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j->flags |= JF_RUNQ;
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requeue(j, &runnable);
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return 1;
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}
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j->flags &= ~(JF_RUNQ | JF_BACKGROUND);
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/*
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* Collect exec arguments. Internal commands for network and
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* mounting build their own argument lists (XXX they should be
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* truly internal).
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*/
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bg = j->flags & JF_FAILED;
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down = j->flags & (JF_STOP | JF_FAILED);
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if (comparam == IP__IP4_IFADDR) {
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argv = alloca(8 * sizeof(char *));
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*(const char **)&argv[0] = _PATH_IFCONFIG;
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if ((cs = strchr(comstring->s, '|'))) {
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argv[1] = alloca(cs - comstring->s + 1);
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strlcpy(argv[1], comstring->s, cs - comstring->s + 1);
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addr = cs + 1;
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} else {
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*(const char **)&argv[1] =
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string_param(j->intparams[IP_INTERFACE]);
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addr = comstring->s;
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}
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*(const char **)&argv[2] = "inet";
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if (!(cs = strchr(addr, '/'))) {
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argv[3] = addr;
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*(const char **)&argv[4] = "netmask";
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*(const char **)&argv[5] = "255.255.255.255";
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argc = 6;
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} else if (strchr(cs + 1, '.')) {
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argv[3] = alloca(cs - addr + 1);
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strlcpy(argv[3], addr, cs - addr + 1);
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*(const char **)&argv[4] = "netmask";
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*(const char **)&argv[5] = cs + 1;
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argc = 6;
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} else {
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argv[3] = addr;
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argc = 4;
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}
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*(const char **)&argv[argc] = down ? "-alias" : "alias";
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argv[argc + 1] = NULL;
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j->flags |= JF_IFUP;
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#ifdef INET6
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} else if (comparam == IP__IP6_IFADDR) {
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argv = alloca(8 * sizeof(char *));
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*(const char **)&argv[0] = _PATH_IFCONFIG;
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if ((cs = strchr(comstring->s, '|'))) {
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argv[1] = alloca(cs - comstring->s + 1);
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strlcpy(argv[1], comstring->s, cs - comstring->s + 1);
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addr = cs + 1;
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} else {
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*(const char **)&argv[1] =
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string_param(j->intparams[IP_INTERFACE]);
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addr = comstring->s;
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}
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*(const char **)&argv[2] = "inet6";
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argv[3] = addr;
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if (!(cs = strchr(addr, '/'))) {
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*(const char **)&argv[4] = "prefixlen";
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*(const char **)&argv[5] = "128";
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argc = 6;
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} else
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argc = 4;
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*(const char **)&argv[argc] = down ? "-alias" : "alias";
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argv[argc + 1] = NULL;
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j->flags |= JF_IFUP;
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#endif
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} else if (comparam == IP_VNET_INTERFACE) {
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argv = alloca(5 * sizeof(char *));
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*(const char **)&argv[0] = _PATH_IFCONFIG;
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argv[1] = comstring->s;
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*(const char **)&argv[2] = down ? "-vnet" : "vnet";
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jidstr = string_param(j->intparams[KP_JID]);
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*(const char **)&argv[3] =
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jidstr ? jidstr : string_param(j->intparams[KP_NAME]);
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argv[4] = NULL;
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j->flags |= JF_IFUP;
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} else if (comparam == IP_MOUNT || comparam == IP__MOUNT_FROM_FSTAB) {
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argv = alloca(8 * sizeof(char *));
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comcs = alloca(comstring->len + 1);
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strcpy(comcs, comstring->s);
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argc = 0;
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for (cs = strtok(comcs, " \t\f\v\r\n"); cs && argc < 4;
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cs = strtok(NULL, " \t\f\v\r\n"))
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argv[argc++] = cs;
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if (argc < 3) {
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jail_warnx(j, "%s: %s: missing information",
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j->intparams[comparam]->name, comstring->s);
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failed(j);
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return -1;
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}
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if (down) {
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argv[4] = NULL;
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argv[3] = argv[1];
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*(const char **)&argv[0] = "/sbin/umount";
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} else {
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if (argc == 4) {
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argv[7] = NULL;
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argv[6] = argv[1];
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argv[5] = argv[0];
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argv[4] = argv[3];
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*(const char **)&argv[3] = "-o";
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} else {
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argv[5] = NULL;
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argv[4] = argv[1];
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argv[3] = argv[0];
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}
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*(const char **)&argv[0] = _PATH_MOUNT;
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}
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*(const char **)&argv[1] = "-t";
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j->flags |= JF_MOUNTED;
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} else if (comparam == IP_MOUNT_DEVFS) {
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path = string_param(j->intparams[KP_PATH]);
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if (path == NULL) {
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jail_warnx(j, "mount.devfs: no path");
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failed(j);
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return -1;
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}
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if (down) {
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argv = alloca(3 * sizeof(char *));
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*(const char **)&argv[0] = "/sbin/umount";
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argv[1] = alloca(strlen(path) + 5);
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sprintf(argv[1], "%s/dev", path);
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argv[2] = NULL;
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} else {
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argv = alloca(4 * sizeof(char *));
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*(const char **)&argv[0] = _PATH_BSHELL;
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*(const char **)&argv[1] = "-c";
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ruleset = string_param(j->intparams
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[IP_MOUNT_DEVFS_RULESET]);
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argv[2] = alloca(strlen(path) +
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(ruleset ? strlen(ruleset) + 1 : 0) + 56);
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sprintf(argv[2], ". /etc/rc.subr; load_rc_config .; "
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"devfs_mount_jail %s/dev%s%s", path,
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ruleset ? " " : "", ruleset ? ruleset : "");
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argv[3] = NULL;
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}
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j->flags |= JF_MOUNTED;
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} else if (comparam == IP_COMMAND && j->name == NULL) {
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argc = 0;
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STAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
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argc++;
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argv = alloca((argc + 1) * sizeof(char *));
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argc = 0;
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STAILQ_FOREACH(s, &j->intparams[IP_COMMAND]->val, tq)
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argv[argc++] = s->s;
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argv[argc] = NULL;
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j->comstring = NULL;
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} else if ((cs = strpbrk(comstring->s, "!\"$&'()*;<>?[\\]`{|}~")) &&
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!(cs[0] == '&' && cs[1] == '\0')) {
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argv = alloca(4 * sizeof(char *));
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*(const char **)&argv[0] = _PATH_BSHELL;
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*(const char **)&argv[1] = "-c";
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argv[2] = comstring->s;
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argv[3] = NULL;
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} else {
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if (cs) {
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*cs = 0;
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bg = 1;
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}
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comcs = alloca(comstring->len + 1);
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strcpy(comcs, comstring->s);
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argc = 0;
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for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
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cs = strtok(NULL, " \t\f\v\r\n"))
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argc++;
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argv = alloca((argc + 1) * sizeof(char *));
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strcpy(comcs, comstring->s);
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argc = 0;
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for (cs = strtok(comcs, " \t\f\v\r\n"); cs;
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cs = strtok(NULL, " \t\f\v\r\n"))
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argv[argc++] = cs;
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argv[argc] = NULL;
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}
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if (argv[0] == NULL)
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return 0;
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j->pstatus = 0;
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if (int_param(j->intparams[IP_EXEC_TIMEOUT], &timeout) &&
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timeout != 0) {
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clock_gettime(CLOCK_REALTIME, &j->timeout);
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j->timeout.tv_sec += timeout;
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} else
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j->timeout.tv_sec = 0;
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injail = comparam == IP_EXEC_START || comparam == IP_COMMAND ||
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comparam == IP_EXEC_STOP;
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clean = bool_param(j->intparams[IP_EXEC_CLEAN]);
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username = string_param(j->intparams[injail
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? IP_EXEC_JAIL_USER : IP_EXEC_SYSTEM_USER]);
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sjuser = bool_param(j->intparams[IP_EXEC_SYSTEM_JAIL_USER]);
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consfd = 0;
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if (injail &&
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(conslog = string_param(j->intparams[IP_EXEC_CONSOLELOG]))) {
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consfd =
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open(conslog, O_WRONLY | O_CREAT | O_APPEND, DEFFILEMODE);
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if (consfd < 0) {
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jail_warnx(j, "open %s: %s", conslog, strerror(errno));
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failed(j);
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return -1;
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}
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}
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comlen = 0;
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for (i = 0; argv[i]; i++)
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comlen += strlen(argv[i]) + 1;
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j->comline = cs = emalloc(comlen);
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for (i = 0; argv[i]; i++) {
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strcpy(cs, argv[i]);
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if (argv[i + 1]) {
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cs += strlen(argv[i]) + 1;
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cs[-1] = ' ';
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}
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}
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if (verbose > 0)
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jail_note(j, "run command%s%s%s: %s\n",
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injail ? " in jail" : "", username ? " as " : "",
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username ? username : "", j->comline);
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pid = fork();
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if (pid < 0)
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err(1, "fork");
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if (pid > 0) {
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if (bg) {
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j->flags |= JF_BACKGROUND;
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requeue(j, &ready);
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} else {
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--*plimit;
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add_proc(j, pid);
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}
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return 1;
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}
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if (bg)
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setsid();
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pwd = NULL;
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lcap = NULL;
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if ((clean || username) && injail && sjuser &&
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get_user_info(j, username, &pwd, &lcap) < 0)
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exit(1);
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if (injail) {
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/* jail_attach won't chdir along with its chroot. */
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path = string_param(j->intparams[KP_PATH]);
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if (path && chdir(path) < 0) {
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jail_warnx(j, "chdir %s: %s", path, strerror(errno));
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exit(1);
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}
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if (int_param(j->intparams[IP_EXEC_FIB], &fib) &&
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setfib(fib) < 0) {
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jail_warnx(j, "setfib: %s", strerror(errno));
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exit(1);
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}
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if (jail_attach(j->jid) < 0) {
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jail_warnx(j, "jail_attach: %s", strerror(errno));
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exit(1);
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}
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}
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if (clean || username) {
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if (!(injail && sjuser) &&
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get_user_info(j, username, &pwd, &lcap) < 0)
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exit(1);
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if (clean) {
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term = getenv("TERM");
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environ = &cleanenv;
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setenv("PATH", "/bin:/usr/bin", 0);
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setenv("TERM", term, 1);
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}
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if (setusercontext(lcap, pwd, pwd->pw_uid, username
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? LOGIN_SETALL & ~LOGIN_SETGROUP & ~LOGIN_SETLOGIN
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: LOGIN_SETPATH | LOGIN_SETENV) < 0) {
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jail_warnx(j, "setusercontext %s: %s", pwd->pw_name,
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strerror(errno));
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exit(1);
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}
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login_close(lcap);
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setenv("USER", pwd->pw_name, 1);
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setenv("HOME", pwd->pw_dir, 1);
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setenv("SHELL",
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*pwd->pw_shell ? pwd->pw_shell : _PATH_BSHELL, 1);
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if (clean && chdir(pwd->pw_dir) < 0) {
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jail_warnx(j, "chdir %s: %s",
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pwd->pw_dir, strerror(errno));
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exit(1);
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}
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endpwent();
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}
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if (consfd != 0 && (dup2(consfd, 1) < 0 || dup2(consfd, 2) < 0)) {
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jail_warnx(j, "exec.consolelog: %s", strerror(errno));
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exit(1);
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}
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closefrom(3);
|
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execvp(argv[0], argv);
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jail_warnx(j, "exec %s: %s", argv[0], strerror(errno));
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exit(1);
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}
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|
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/*
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* Check command exit status
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*/
|
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int
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finish_command(struct cfjail *j, int *plimit)
|
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{
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int error;
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|
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if (j->flags & (JF_RUNQ | JF_BACKGROUND))
|
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return 0;
|
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++*plimit;
|
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if (!TAILQ_EMPTY(&runnable))
|
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requeue(TAILQ_FIRST(&runnable), &ready);
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error = 0;
|
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if (j->flags & JF_TIMEOUT) {
|
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j->flags &= ~JF_TIMEOUT;
|
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if (j->comparam != IP_STOP_TIMEOUT) {
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jail_warnx(j, "%s: timed out", j->comline);
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failed(j);
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error = -1;
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} else if (verbose > 0)
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jail_note(j, "timed out\n");
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} else if (j->pstatus != 0) {
|
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if (WIFSIGNALED(j->pstatus))
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jail_warnx(j, "%s: exited on signal %d",
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j->comline, WTERMSIG(j->pstatus));
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else
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jail_warnx(j, "%s: failed", j->comline);
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failed(j);
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error = -1;
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}
|
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free(j->comline);
|
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return error;
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}
|
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|
|
/*
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* Check for finished processed or timeouts.
|
|
*/
|
|
struct cfjail *
|
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next_proc(int nonblock)
|
|
{
|
|
struct kevent ke;
|
|
struct timespec ts;
|
|
struct timespec *tsp;
|
|
struct cfjail *j;
|
|
|
|
if (!TAILQ_EMPTY(&sleeping)) {
|
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again:
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tsp = NULL;
|
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if ((j = TAILQ_FIRST(&sleeping)) && j->timeout.tv_sec) {
|
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clock_gettime(CLOCK_REALTIME, &ts);
|
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ts.tv_sec = j->timeout.tv_sec - ts.tv_sec;
|
|
ts.tv_nsec = j->timeout.tv_nsec - ts.tv_nsec;
|
|
if (ts.tv_nsec < 0) {
|
|
ts.tv_sec--;
|
|
ts.tv_nsec += 1000000000;
|
|
}
|
|
if (ts.tv_sec < 0 ||
|
|
(ts.tv_sec == 0 && ts.tv_nsec == 0)) {
|
|
j->flags |= JF_TIMEOUT;
|
|
clear_procs(j);
|
|
return j;
|
|
}
|
|
tsp = &ts;
|
|
}
|
|
if (nonblock) {
|
|
ts.tv_sec = 0;
|
|
ts.tv_nsec = 0;
|
|
tsp = &ts;
|
|
}
|
|
switch (kevent(kq, NULL, 0, &ke, 1, tsp)) {
|
|
case -1:
|
|
if (errno != EINTR)
|
|
err(1, "kevent");
|
|
goto again;
|
|
case 0:
|
|
if (!nonblock) {
|
|
j = TAILQ_FIRST(&sleeping);
|
|
j->flags |= JF_TIMEOUT;
|
|
clear_procs(j);
|
|
return j;
|
|
}
|
|
break;
|
|
case 1:
|
|
(void)waitpid(ke.ident, NULL, WNOHANG);
|
|
if ((j = find_proc(ke.ident))) {
|
|
j->pstatus = ke.data;
|
|
return j;
|
|
}
|
|
goto again;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Send SIGTERM to all processes in a jail and wait for them to die.
|
|
*/
|
|
int
|
|
term_procs(struct cfjail *j)
|
|
{
|
|
struct kinfo_proc *ki;
|
|
int i, noted, pcnt, timeout;
|
|
|
|
static kvm_t *kd;
|
|
|
|
if (!int_param(j->intparams[IP_STOP_TIMEOUT], &timeout))
|
|
timeout = DEFAULT_STOP_TIMEOUT;
|
|
else if (timeout == 0)
|
|
return 0;
|
|
|
|
if (kd == NULL) {
|
|
kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "jail");
|
|
if (kd == NULL)
|
|
exit(1);
|
|
}
|
|
|
|
ki = kvm_getprocs(kd, KERN_PROC_PROC, 0, &pcnt);
|
|
if (ki == NULL)
|
|
exit(1);
|
|
noted = 0;
|
|
for (i = 0; i < pcnt; i++)
|
|
if (ki[i].ki_jid == j->jid &&
|
|
kill(ki[i].ki_pid, SIGTERM) == 0) {
|
|
add_proc(j, ki[i].ki_pid);
|
|
if (verbose > 0) {
|
|
if (!noted) {
|
|
noted = 1;
|
|
jail_note(j, "sent SIGTERM to:");
|
|
}
|
|
printf(" %d", ki[i].ki_pid);
|
|
}
|
|
}
|
|
if (noted)
|
|
printf("\n");
|
|
if (j->nprocs > 0) {
|
|
clock_gettime(CLOCK_REALTIME, &j->timeout);
|
|
j->timeout.tv_sec += timeout;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add a process to the hash, tied to a jail.
|
|
*/
|
|
static void
|
|
add_proc(struct cfjail *j, pid_t pid)
|
|
{
|
|
struct kevent ke;
|
|
struct cfjail *tj;
|
|
struct phash *ph;
|
|
|
|
if (!kq && (kq = kqueue()) < 0)
|
|
err(1, "kqueue");
|
|
EV_SET(&ke, pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, NULL);
|
|
if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0)
|
|
err(1, "kevent");
|
|
ph = emalloc(sizeof(struct phash));
|
|
ph->j = j;
|
|
ph->pid = pid;
|
|
LIST_INSERT_HEAD(&phash[pid % PHASH_SIZE], ph, le);
|
|
j->nprocs++;
|
|
if (j->timeout.tv_sec) {
|
|
TAILQ_REMOVE(j->queue, j, tq);
|
|
TAILQ_FOREACH(tj, &sleeping, tq) {
|
|
if (!tj->timeout.tv_sec ||
|
|
j->timeout.tv_sec < tj->timeout.tv_sec ||
|
|
(j->timeout.tv_sec == tj->timeout.tv_sec &&
|
|
j->timeout.tv_nsec <= tj->timeout.tv_nsec)) {
|
|
TAILQ_INSERT_BEFORE(tj, j, tq);
|
|
break;
|
|
}
|
|
}
|
|
if (tj == NULL)
|
|
TAILQ_INSERT_TAIL(&sleeping, j, tq);
|
|
j->queue = &sleeping;
|
|
} else
|
|
requeue(j, &sleeping);
|
|
}
|
|
|
|
/*
|
|
* Remove any processes from the hash that correspond to a jail.
|
|
*/
|
|
static void
|
|
clear_procs(struct cfjail *j)
|
|
{
|
|
struct kevent ke;
|
|
struct phash *ph, *tph;
|
|
int i;
|
|
|
|
j->nprocs = 0;
|
|
for (i = 0; i < PHASH_SIZE; i++)
|
|
LIST_FOREACH_SAFE(ph, &phash[i], le, tph)
|
|
if (ph->j == j) {
|
|
EV_SET(&ke, ph->pid, EVFILT_PROC, EV_DELETE,
|
|
NOTE_EXIT, 0, NULL);
|
|
(void)kevent(kq, &ke, 1, NULL, 0, NULL);
|
|
LIST_REMOVE(ph, le);
|
|
free(ph);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find the jail that corresponds to an exited process.
|
|
*/
|
|
static struct cfjail *
|
|
find_proc(pid_t pid)
|
|
{
|
|
struct cfjail *j;
|
|
struct phash *ph;
|
|
|
|
LIST_FOREACH(ph, &phash[pid % PHASH_SIZE], le)
|
|
if (ph->pid == pid) {
|
|
j = ph->j;
|
|
LIST_REMOVE(ph, le);
|
|
free(ph);
|
|
return --j->nprocs ? NULL : j;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Look up a user in the passwd and login.conf files.
|
|
*/
|
|
static int
|
|
get_user_info(struct cfjail *j, const char *username,
|
|
const struct passwd **pwdp, login_cap_t **lcapp)
|
|
{
|
|
const struct passwd *pwd;
|
|
|
|
*pwdp = pwd = username ? getpwnam(username) : getpwuid(getuid());
|
|
if (pwd == NULL) {
|
|
if (errno)
|
|
jail_warnx(j, "getpwnam%s%s: %s", username ? " " : "",
|
|
username ? username : "", strerror(errno));
|
|
else if (username)
|
|
jail_warnx(j, "%s: no such user", username);
|
|
else
|
|
jail_warnx(j, "unknown uid %d", getuid());
|
|
return -1;
|
|
}
|
|
*lcapp = login_getpwclass(pwd);
|
|
if (*lcapp == NULL) {
|
|
jail_warnx(j, "getpwclass %s: %s", pwd->pw_name,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
/* Set the groups while the group file is still available */
|
|
if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) {
|
|
jail_warnx(j, "initgroups %s: %s", pwd->pw_name,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|