3 # $FreeBSD: src/etc/rc.d/jail,v 1.23.2.9 2007/01/11 18:16:58 simon Exp $
14 start_cmd="jail_start"
18 # Initialize the various jail variables for jail _j.
25 warn "init_variables: you must specify a jail"
29 eval _rootdir=\"\$jail_${_j}_rootdir\"
30 _devdir="${_rootdir}/dev"
31 _procdir="${_rootdir}/proc"
32 eval _hostname=\"\$jail_${_j}_hostname\"
33 eval _ip=\"\$jail_${_j}_ip\"
34 eval _interface=\"\${jail_${_j}_interface:-${jail_interface}}\"
35 eval _exec=\"\$jail_${_j}_exec\"
36 eval _exec_start=\"\${jail_${_j}_exec_start:-${jail_exec_start}}\"
37 eval _exec_stop=\"\${jail_${_j}_exec_stop:-${jail_exec_stop}}\"
38 if [ -n "${_exec}" ]; then
39 # simple/backward-compatible execution
40 _exec_start="${_exec}"
44 if [ -z "${_exec_start}" ]; then
45 _exec_start="/bin/sh /etc/rc"
46 if [ -z "${_exec_stop}" ]; then
47 _exec_stop="/bin/sh /etc/rc.shutdown"
52 eval _devfs=\"\${jail_${_j}_devfs_enable:-${jail_devfs_enable}}\"
53 [ -z "${_devfs}" ] && _devfs="NO"
54 eval _procfs=\"\${jail_${_j}_procfs_enable:-${jail_procfs_enable}}\"
55 [ -z "${_procfs}" ] && _procfs="NO"
57 eval _mount=\"\${jail_${_j}_mount_enable:-${jail_mount_enable}}\"
58 [ -z "${_mount}" ] && _mount="NO"
59 # "/etc/fstab.${_j}" will be used for {,u}mount(8) if none is specified.
60 eval _fstab=\"\${jail_${_j}_fstab:-${jail_fstab}}\"
61 [ -z "${_fstab}" ] && _fstab="/etc/fstab.${_j}"
62 eval _flags=\"\${jail_${_j}_flags:-${jail_flags}}\"
63 [ -z "${_flags}" ] && _flags="-l -U root"
64 eval _consolelog=\"\${jail_${_j}_consolelog:-${jail_consolelog}}\"
65 [ -z "${_consolelog}" ] && _consolelog="/var/log/jail_${_j}_console.log"
69 debug "$_j devfs enable: $_devfs"
70 debug "$_j procfs enable: $_procfs"
71 debug "$_j mount enable: $_mount"
72 debug "$_j hostname: $_hostname"
74 debug "$_j interface: $_interface"
75 debug "$_j root: $_rootdir"
76 debug "$_j devdir: $_devdir"
77 debug "$_j procdir: $_procdir"
78 debug "$_j fstab: $_fstab"
79 debug "$_j exec start: $_exec_start"
80 debug "$_j exec stop: $_exec_stop"
81 debug "$_j flags: $_flags"
82 debug "$_j consolelog: $_consolelog"
84 if [ -z "${_hostname}" ]; then
85 err 3 "$name: No hostname has been defined for ${_j}"
87 if [ -z "${_rootdir}" ]; then
88 err 3 "$name: No root directory has been defined for ${_j}"
90 if [ -z "${_ip}" ]; then
91 err 3 "$name: No IP address has been defined for ${_j}"
96 # set_sysctl rc_knob mib msg
97 # If the mib sysctl is set according to what rc_knob
98 # specifies, this function does nothing. However if
99 # rc_knob is set differently than mib, then the mib
100 # is set accordingly and msg is displayed followed by
101 # an '=" sign and the word 'YES' or 'NO'.
109 _current=`${SYSCTL_N} -q $_mib`
110 if checkyesno $_knob ; then
111 if [ "$_current" -ne 1 ]; then
112 echo -n " ${_msg}=YES"
113 ${SYSCTL_W} ${_mib}=1 >/dev/null
116 if [ "$_current" -ne 0 ]; then
117 echo -n " ${_msg}=NO"
118 ${SYSCTL_W} ${_mib}=0 >/dev/null
123 # is_current_mountpoint()
124 # Is the directory mount point for a currently mounted file
127 is_current_mountpoint()
133 _dir=`echo $_dir | sed -Ee 's#//+#/#g' -e 's#/$##'`
134 [ ! -d "${_dir}" ] && return 1
135 _dir2=`df ${_dir} | tail +2 | awk '{ print $6 }'`
136 [ "${_dir}" = "${_dir2}" ]
140 # is_symlinked_mountpoint()
141 # Is a mount point, or any of its parent directories, a symlink?
143 is_symlinked_mountpoint()
149 [ -L "$_dir" ] && return 0
150 [ "$_dir" = "/" ] && return 1
151 is_symlinked_mountpoint `dirname $_dir`
156 # Try to unmount a mount point without being vulnerable to
165 if is_current_mountpoint ${_dir}; then
166 umount -f ${_dir} >/dev/null 2>&1
168 debug "Nothing mounted on ${_dir} - not unmounting"
174 # This function unmounts certain special filesystems in the
175 # currently selected jail. The caller must call the init_variables()
176 # routine before calling this one.
180 local _device _mountpt _rest
182 if checkyesno _devfs; then
183 if [ -d "${_devdir}" ] ; then
184 secure_umount ${_devdir}
187 if checkyesno _procfs; then
188 if [ -d "${_procdir}" ] ; then
189 secure_umount ${_procdir}
192 if checkyesno _mount; then
193 [ -f "${_fstab}" ] || warn "${_fstab} does not exist"
194 tail -r ${_fstab} | while read _device _mountpt _rest; do
195 case ":${_device}" in
200 secure_umount ${_mountpt}
206 # Mount file systems from a per jail fstab while trying to
207 # secure against symlink attacks at the mount points.
209 # If we are certain we cannot secure against symlink attacks we
210 # do not mount all of the file systems (since we cannot just not
211 # mount the file system with the problematic mount point).
213 # The caller must call the init_variables() routine before
218 local _device _mountpt _rest
220 while read _device _mountpt _rest; do
221 case ":${_device}" in
226 if is_symlinked_mountpoint ${_mountpt}; then
227 warn "${_mountpt} has symlink as parent - not mounting from ${_fstab}"
231 mount -a -F "${_fstab}"
236 echo -n 'Configuring jails:'
237 set_sysctl jail_set_hostname_allow jail.set_hostname_allowed \
239 set_sysctl jail_socket_unixiproute_only \
240 jail.socket_unixiproute_only unixiproute_only
241 set_sysctl jail_sysvipc_allow jail.sysvipc_allowed \
245 echo -n 'Starting jails:'
246 _tmp_dir=`mktemp -d /tmp/jail.XXXXXXXX` || \
247 err 3 "$name: Can't create temp dir, exiting..."
248 for _jail in ${jail_list}
250 init_variables $_jail
251 if [ -f /var/run/jail_${_jail}.id ]; then
252 echo -n " [${_hostname} already running (/var/run/jail_${_jail}.id exists)]"
255 if [ -n "${_interface}" ]; then
256 ifconfig ${_interface} alias ${_ip} netmask 255.255.255.255
258 if checkyesno _mount; then
259 info "Mounting fstab for jail ${_jail} (${_fstab})"
260 if [ ! -f "${_fstab}" ]; then
261 err 3 "$name: ${_fstab} does not exist"
265 if checkyesno _devfs; then
266 # If devfs is already mounted here, skip it.
267 df -t devfs "${_devdir}" >/dev/null
268 if [ $? -ne 0 ]; then
269 if is_symlinked_mountpoint ${_devdir}; then
270 warn "${_devdir} has symlink as parent" \
271 "- not starting jail ${_jail}"
274 info "Mounting devfs on ${_devdir}"
275 devfs_mount_jail "${_devdir}"
278 if checkyesno _procfs; then
279 if is_symlinked_mountpoint ${_procdir}; then
280 warn "${_procdir} has symlink as parent, not mounting"
282 info "Mounting procfs onto ${_procdir}"
283 if [ -d "${_procdir}" ] ; then
284 mount -t procfs proc "${_procdir}"
288 _tmp_jail=${_tmp_dir}/jail.$$
289 eval jail ${_flags} -i ${_rootdir} ${_hostname} \
290 ${_ip} ${_exec_start} > ${_tmp_jail} 2>&1
291 if [ "$?" -eq 0 ] ; then
292 echo -n " $_hostname"
293 _jail_id=$(head -1 ${_tmp_jail})
294 tail +2 ${_tmp_jail} >${_consolelog}
295 echo ${_jail_id} > /var/run/jail_${_jail}.id
298 if [ -n "${_interface}" ]; then
299 ifconfig ${_interface} -alias ${_ip}
301 echo " cannot start jail \"${_jail}\": "
312 echo -n 'Stopping jails:'
313 for _jail in ${jail_list}
315 if [ -f "/var/run/jail_${_jail}.id" ]; then
316 _jail_id=$(cat /var/run/jail_${_jail}.id)
317 if [ ! -z "${_jail_id}" ]; then
318 init_variables $_jail
319 if [ -n "${_exec_stop}" ]; then
320 eval env -i /usr/sbin/jexec ${_jail_id} ${_exec_stop} \
321 >> ${_consolelog} 2>&1
323 killall -j ${_jail_id} -TERM > /dev/null 2>&1
325 killall -j ${_jail_id} -KILL > /dev/null 2>&1
327 echo -n " $_hostname"
329 if [ -n "${_interface}" ]; then
330 ifconfig ${_interface} -alias ${_ip}
332 rm /var/run/jail_${_jail}.id
334 echo " cannot stop jail ${_jail}. No jail id in /var/run"
342 if [ $# -gt 0 ]; then
348 run_rc_command "${cmd}"