426 lines
10 KiB
Bash
426 lines
10 KiB
Bash
#!/bin/sh
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#
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# $FreeBSD$
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#
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# PROVIDE: jail
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# REQUIRE: LOGIN cleanvar
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# BEFORE: securelevel
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# KEYWORD: nojail shutdown
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# WARNING: This script deals with untrusted data (the data and
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# processes inside the jails) and care must be taken when changing the
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# code related to this! If you have any doubt whether a change is
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# correct and have security impact, please get the patch reviewed by
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# the FreeBSD Security Team prior to commit.
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. /etc/rc.subr
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name="jail"
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rcvar=`set_rcvar`
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start_cmd="jail_start"
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stop_cmd="jail_stop"
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# init_variables _j
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# Initialize the various jail variables for jail _j.
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#
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init_variables()
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{
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_j="$1"
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if [ -z "$_j" ]; then
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warn "init_variables: you must specify a jail"
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return
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fi
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eval _rootdir=\"\$jail_${_j}_rootdir\"
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_devdir="${_rootdir}/dev"
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_fdescdir="${_devdir}/fd"
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_procdir="${_rootdir}/proc"
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eval _hostname=\"\$jail_${_j}_hostname\"
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eval _ip=\"\$jail_${_j}_ip\"
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eval _interface=\"\${jail_${_j}_interface:-${jail_interface}}\"
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eval _exec=\"\$jail_${_j}_exec\"
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eval _exec_start=\"\${jail_${_j}_exec_start:-${jail_exec_start}}\"
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i=1
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while [ true ]; do
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eval _exec_afterstart${i}=\"\${jail_${_j}_exec_afterstart${i}:-\${jail_exec_afterstart${i}}}\"
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[ -z "$(eval echo \"\$_exec_afterstart${i}\")" ] && break
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i=$((i + 1))
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done
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eval _exec_stop=\"\${jail_${_j}_exec_stop:-${jail_exec_stop}}\"
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if [ -n "${_exec}" ]; then
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# simple/backward-compatible execution
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_exec_start="${_exec}"
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_exec_stop=""
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else
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# flexible execution
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if [ -z "${_exec_start}" ]; then
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_exec_start="/bin/sh /etc/rc"
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if [ -z "${_exec_stop}" ]; then
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_exec_stop="/bin/sh /etc/rc.shutdown"
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fi
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fi
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fi
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# The default jail ruleset will be used by rc.subr if none is specified.
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eval _ruleset=\"\${jail_${_j}_devfs_ruleset:-${jail_devfs_ruleset}}\"
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eval _devfs=\"\${jail_${_j}_devfs_enable:-${jail_devfs_enable}}\"
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[ -z "${_devfs}" ] && _devfs="NO"
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eval _fdescfs=\"\${jail_${_j}_fdescfs_enable:-${jail_fdescfs_enable}}\"
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[ -z "${_fdescfs}" ] && _fdescfs="NO"
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eval _procfs=\"\${jail_${_j}_procfs_enable:-${jail_procfs_enable}}\"
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[ -z "${_procfs}" ] && _procfs="NO"
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eval _mount=\"\${jail_${_j}_mount_enable:-${jail_mount_enable}}\"
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[ -z "${_mount}" ] && _mount="NO"
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# "/etc/fstab.${_j}" will be used for {,u}mount(8) if none is specified.
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eval _fstab=\"\${jail_${_j}_fstab:-${jail_fstab}}\"
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[ -z "${_fstab}" ] && _fstab="/etc/fstab.${_j}"
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eval _flags=\"\${jail_${_j}_flags:-${jail_flags}}\"
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[ -z "${_flags}" ] && _flags="-l -U root"
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eval _consolelog=\"\${jail_${_j}_consolelog:-${jail_consolelog}}\"
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[ -z "${_consolelog}" ] && _consolelog="/var/log/jail_${_j}_console.log"
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# Debugging aid
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#
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debug "$_j devfs enable: $_devfs"
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debug "$_j fdescfs enable: $_fdescfs"
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debug "$_j procfs enable: $_procfs"
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debug "$_j mount enable: $_mount"
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debug "$_j hostname: $_hostname"
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debug "$_j ip: $_ip"
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debug "$_j interface: $_interface"
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debug "$_j root: $_rootdir"
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debug "$_j devdir: $_devdir"
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debug "$_j fdescdir: $_fdescdir"
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debug "$_j procdir: $_procdir"
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debug "$_j ruleset: $_ruleset"
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debug "$_j fstab: $_fstab"
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debug "$_j exec start: $_exec_start"
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debug "$_j consolelog: $_consolelog"
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i=1
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while [ true ]; do
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eval out=\"\${_exec_afterstart${i}:-''}\"
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if [ -z "$out" ]; then
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break;
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fi
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debug "$_j exec after start #${i}: ${out}"
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i=$((i + 1))
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done
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debug "$_j exec stop: $_exec_stop"
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debug "$_j flags: $_flags"
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debug "$_j consolelog: $_consolelog"
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if [ -z "${_hostname}" ]; then
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err 3 "$name: No hostname has been defined for ${_j}"
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fi
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if [ -z "${_rootdir}" ]; then
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err 3 "$name: No root directory has been defined for ${_j}"
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fi
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if [ -z "${_ip}" ]; then
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err 3 "$name: No IP address has been defined for ${_j}"
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fi
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}
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# set_sysctl rc_knob mib msg
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# If the mib sysctl is set according to what rc_knob
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# specifies, this function does nothing. However if
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# rc_knob is set differently than mib, then the mib
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# is set accordingly and msg is displayed followed by
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# an '=" sign and the word 'YES' or 'NO'.
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#
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set_sysctl()
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{
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_knob="$1"
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_mib="$2"
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_msg="$3"
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_current=`${SYSCTL} -n $_mib 2>/dev/null`
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if checkyesno $_knob ; then
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if [ "$_current" -ne 1 ]; then
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echo -n " ${_msg}=YES"
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${SYSCTL_W} 1>/dev/null ${_mib}=1
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fi
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else
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if [ "$_current" -ne 0 ]; then
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echo -n " ${_msg}=NO"
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${SYSCTL_W} 1>/dev/null ${_mib}=0
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fi
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fi
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}
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# is_current_mountpoint()
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# Is the directory mount point for a currently mounted file
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# system?
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#
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is_current_mountpoint()
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{
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local _dir _dir2
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_dir=$1
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_dir=`echo $_dir | sed -Ee 's#//+#/#g' -e 's#/$##'`
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[ ! -d "${_dir}" ] && return 1
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_dir2=`df ${_dir} | tail +2 | awk '{ print $6 }'`
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[ "${_dir}" = "${_dir2}" ]
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return $?
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}
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# is_symlinked_mountpoint()
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# Is a mount point, or any of its parent directories, a symlink?
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#
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is_symlinked_mountpoint()
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{
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local _dir
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_dir=$1
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[ -L "$_dir" ] && return 0
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[ "$_dir" = "/" ] && return 1
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is_symlinked_mountpoint `dirname $_dir`
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return $?
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}
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# secure_umount
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# Try to unmount a mount point without being vulnerable to
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# symlink attacks.
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#
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secure_umount()
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{
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local _dir
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_dir=$1
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if is_current_mountpoint ${_dir}; then
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umount -f ${_dir} >/dev/null 2>&1
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else
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debug "Nothing mounted on ${_dir} - not unmounting"
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fi
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}
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# jail_umount_fs
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# This function unmounts certain special filesystems in the
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# currently selected jail. The caller must call the init_variables()
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# routine before calling this one.
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#
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jail_umount_fs()
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{
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local _device _mountpt _rest
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if checkyesno _fdescfs; then
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if [ -d "${_fdescdir}" ] ; then
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secure_umount ${_fdescdir}
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fi
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fi
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if checkyesno _devfs; then
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if [ -d "${_devdir}" ] ; then
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secure_umount ${_devdir}
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fi
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fi
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if checkyesno _procfs; then
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if [ -d "${_procdir}" ] ; then
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secure_umount ${_procdir}
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fi
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fi
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if checkyesno _mount; then
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[ -f "${_fstab}" ] || warn "${_fstab} does not exist"
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tail -r ${_fstab} | while read _device _mountpt _rest; do
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case ":${_device}" in
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:#* | :)
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continue
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;;
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esac
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secure_umount ${_mountpt}
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done
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fi
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}
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# jail_mount_fstab()
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# Mount file systems from a per jail fstab while trying to
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# secure against symlink attacks at the mount points.
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#
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# If we are certain we cannot secure against symlink attacks we
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# do not mount all of the file systems (since we cannot just not
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# mount the file system with the problematic mount point).
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#
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# The caller must call the init_variables() routine before
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# calling this one.
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#
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jail_mount_fstab()
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{
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local _device _mountpt _rest
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while read _device _mountpt _rest; do
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case ":${_device}" in
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:#* | :)
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continue
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;;
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esac
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if is_symlinked_mountpoint ${_mountpt}; then
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warn "${_mountpt} has symlink as parent - not mounting from ${_fstab}"
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return
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fi
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done <${_fstab}
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mount -a -F "${_fstab}"
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}
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jail_start()
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{
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echo -n 'Configuring jails:'
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set_sysctl jail_set_hostname_allow security.jail.set_hostname_allowed \
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set_hostname_allow
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set_sysctl jail_socket_unixiproute_only \
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security.jail.socket_unixiproute_only unixiproute_only
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set_sysctl jail_sysvipc_allow security.jail.sysvipc_allowed \
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sysvipc_allow
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echo '.'
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echo -n 'Starting jails:'
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_tmp_dir=`mktemp -d /tmp/jail.XXXXXXXX` || \
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err 3 "$name: Can't create temp dir, exiting..."
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for _jail in ${jail_list}
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do
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init_variables $_jail
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if [ -f /var/run/jail_${_jail}.id ]; then
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echo -n " [${_hostname} already running (/var/run/jail_${_jail}.id exists)]"
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continue;
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fi
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if [ -n "${_interface}" ]; then
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ifconfig ${_interface} alias ${_ip} netmask 255.255.255.255
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fi
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if checkyesno _mount; then
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info "Mounting fstab for jail ${_jail} (${_fstab})"
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if [ ! -f "${_fstab}" ]; then
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err 3 "$name: ${_fstab} does not exist"
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fi
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jail_mount_fstab
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fi
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if checkyesno _devfs; then
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# If devfs is already mounted here, skip it.
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df -t devfs "${_devdir}" >/dev/null
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if [ $? -ne 0 ]; then
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if is_symlinked_mountpoint ${_devdir}; then
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warn "${_devdir} has symlink as parent - not starting jail ${_jail}"
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continue
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fi
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info "Mounting devfs on ${_devdir}"
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devfs_mount_jail "${_devdir}" ${_ruleset}
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# Transitional symlink for old binaries
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if [ ! -L "${_devdir}/log" ]; then
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__pwd="`pwd`"
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cd "${_devdir}"
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ln -sf ../var/run/log log
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cd "$__pwd"
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fi
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fi
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# XXX - It seems symlinks don't work when there
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# is a devfs(5) device of the same name.
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# Jail console output
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# __pwd="`pwd`"
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# cd "${_devdir}"
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# ln -sf ../var/log/console console
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# cd "$__pwd"
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fi
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if checkyesno _fdescfs; then
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if is_symlinked_mountpoint ${_fdescdir}; then
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warn "${_fdescdir} has symlink as parent, not mounting"
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else
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info "Mounting fdescfs on ${_fdescdir}"
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mount -t fdescfs fdesc "${_fdescdir}"
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fi
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fi
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if checkyesno _procfs; then
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if is_symlinked_mountpoint ${_procdir}; then
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warn "${_procdir} has symlink as parent, not mounting"
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else
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info "Mounting procfs onto ${_procdir}"
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if [ -d "${_procdir}" ] ; then
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mount -t procfs proc "${_procdir}"
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fi
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fi
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fi
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_tmp_jail=${_tmp_dir}/jail.$$
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eval jail ${_flags} -i ${_rootdir} ${_hostname} \
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${_ip} ${_exec_start} > ${_tmp_jail} 2>&1
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if [ "$?" -eq 0 ] ; then
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_jail_id=$(head -1 ${_tmp_jail})
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i=1
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while [ true ]; do
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eval out=\"\${_exec_afterstart${i}:-''}\"
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if [ -z "$out" ]; then
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break;
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fi
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jexec "${_jail_id}" ${out}
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i=$((i + 1))
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done
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echo -n " $_hostname"
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tail +2 ${_tmp_jail} >${_consolelog}
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echo ${_jail_id} > /var/run/jail_${_jail}.id
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else
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jail_umount_fs
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if [ -n "${_interface}" ]; then
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ifconfig ${_interface} -alias ${_ip}
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fi
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echo " cannot start jail \"${_jail}\": "
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tail +2 ${_tmp_jail}
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fi
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rm -f ${_tmp_jail}
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done
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rmdir ${_tmp_dir}
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echo '.'
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}
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jail_stop()
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{
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echo -n 'Stopping jails:'
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for _jail in ${jail_list}
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do
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if [ -f "/var/run/jail_${_jail}.id" ]; then
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_jail_id=$(cat /var/run/jail_${_jail}.id)
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if [ ! -z "${_jail_id}" ]; then
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init_variables $_jail
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if [ -n "${_exec_stop}" ]; then
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eval env -i /usr/sbin/jexec ${_jail_id} ${_exec_stop} \
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>> ${_consolelog} 2>&1
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fi
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killall -j ${_jail_id} -TERM > /dev/null 2>&1
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sleep 1
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killall -j ${_jail_id} -KILL > /dev/null 2>&1
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jail_umount_fs
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echo -n " $_hostname"
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fi
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if [ -n "${_interface}" ]; then
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ifconfig ${_interface} -alias ${_ip}
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fi
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rm /var/run/jail_${_jail}.id
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else
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echo " cannot stop jail ${_jail}. No jail id in /var/run"
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fi
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done
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echo '.'
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}
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load_rc_config $name
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cmd="$1"
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if [ $# -gt 0 ]; then
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shift
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fi
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if [ -n "$*" ]; then
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jail_list="$*"
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fi
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run_rc_command "${cmd}"
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