87fa155012
- Remove redundant debugging of consolelog. - Use `while :', instead of `while [ true ]'. This is done in other places as well. Submitted by: Jille Timmermans <jille quis cx> (not jilles) Reviewed by: jilles
732 lines
17 KiB
Bash
Executable File
732 lines
17 KiB
Bash
Executable File
#!/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_${_j}_exec\"
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i=0
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while : ; do
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eval _exec_prestart${i}=\"\${jail_${_j}_exec_prestart${i}:-\${jail_exec_prestart${i}}}\"
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[ -z "$(eval echo \"\$_exec_prestart${i}\")" ] && break
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i=$((i + 1))
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done
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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 : ; 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=$((i + 1))
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done
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i=0
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while : ; do
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eval _exec_poststart${i}=\"\${jail_${_j}_exec_poststart${i}:-\${jail_exec_poststart${i}}}\"
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[ -z "$(eval echo \"\$_exec_poststart${i}\")" ] && break
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i=$((i + 1))
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done
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i=0
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while : ; do
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eval _exec_prestop${i}=\"\${jail_${_j}_exec_prestop${i}:-\${jail_exec_prestop${i}}}\"
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[ -z "$(eval echo \"\$_exec_prestop${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:-${jail_exec_stop}}\"
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i=0
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while : ; do
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eval _exec_poststop${i}=\"\${jail_${_j}_exec_poststop${i}:-\${jail_exec_poststop${i}}}\"
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[ -z "$(eval echo \"\$_exec_poststop${i}\")" ] && break
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i=$((i + 1))
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done
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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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eval _fib=\"\${jail_${_j}_fib:-${jail_fib}}\"
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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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jail_show_addresses ${_j}
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debug "$_j interface: $_interface"
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debug "$_j fib: $_fib"
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debug "$_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: $_fstab"
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i=0
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while : ; do
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eval out=\"\${_exec_prestart${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 pre-start #${i}: ${out}"
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i=$((i + 1))
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done
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debug "$_j exec start: $_exec_start"
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i=1
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while : ; do
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eval out=\"\${_exec_afterstart${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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i=0
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while : ; do
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eval out=\"\${_exec_poststart${i}:-''}\"
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if [ -z "$out" ]; then
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break
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fi
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debug "$_j exec post-start #${i}: ${out}"
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i=$((i + 1))
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done
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i=0
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while : ; do
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eval out=\"\${_exec_prestop${i}:-''}\"
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if [ -z "$out" ]; then
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break
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fi
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debug "$_j exec pre-stop #${i}: ${out}"
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i=$((i + 1))
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done
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debug "$_j exec stop: $_exec_stop"
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i=0
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while : ; do
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eval out=\"\${_exec_poststop${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 post-stop #${i}: ${out}"
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i=$((i + 1))
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done
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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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}
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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_show_addresses jail
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# Debug print the input for the given _multi aliases
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# for a jail for init_variables().
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#
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jail_show_addresses()
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{
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local _j _type alias
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_j="$1"
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alias=0
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if [ -z "${_j}" ]; then
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warn "jail_show_addresses: you must specify a jail"
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return
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fi
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while : ; do
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eval _addr=\"\$jail_${_j}_ip_multi${alias}\"
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if [ -n "${_addr}" ]; then
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debug "${_j} ip_multi${alias}: $_addr"
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alias=$((${alias} + 1))
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else
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break
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fi
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done
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}
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# jail_extract_address argument
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# The second argument is the string from one of the _ip
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# or the _multi variables. In case of a comma separated list
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# only one argument must be passed in at a time.
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# The function alters the _type, _iface, _addr and _mask variables.
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#
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jail_extract_address()
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{
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local _i
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_i=$1
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if [ -z "${_i}" ]; then
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warn "jail_extract_address: called without input"
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return
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fi
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# Check if we have an interface prefix given and split into
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# iFace and rest.
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case "${_i}" in
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*\|*) # ifN|.. prefix there
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_iface=${_i%%|*}
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_r=${_i##*|}
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;;
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*) _iface=""
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_r=${_i}
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;;
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esac
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# In case the IP has no interface given, check if we have a global one.
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_iface=${_iface:-${_interface}}
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# Set address, cut off any prefix/netmask/prefixlen.
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_addr=${_r}
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_addr=${_addr%%[/ ]*}
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# Theoretically we can return here if interface is not set,
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# as we only care about the _mask if we call ifconfig.
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# This is not done because we may want to santize IP addresses
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# based on _type later, and optionally change the type as well.
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# Extract the prefix/netmask/prefixlen part by cutting off the address.
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_mask=${_r}
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_mask=`expr "${_mask}" : "${_addr}\(.*\)"`
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# Identify type {inet,inet6}.
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case "${_addr}" in
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*\.*\.*\.*) _type="inet" ;;
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*:*) _type="inet6" ;;
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*) warn "jail_extract_address: type not identified"
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;;
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esac
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# Handle the special /netmask instead of /prefix or
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# "netmask xxx" case for legacy IP.
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# We do NOT support shortend class-full netmasks.
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if [ "${_type}" = "inet" ]; then
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case "${_mask}" in
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/*\.*\.*\.*) _mask=" netmask ${_mask#/}" ;;
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*) ;;
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esac
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# In case _mask is still not set use /32.
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_mask=${_mask:-/32}
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elif [ "${_type}" = "inet6" ]; then
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# In case _maske is not set for IPv6, use /128.
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_mask=${_mask:-/128}
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fi
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}
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# jail_handle_ips_option {add,del} input
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# Handle a single argument imput which can be a comma separated
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# list of addresses (theoretically with an option interface and
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# prefix/netmask/prefixlen).
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#
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jail_handle_ips_option()
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{
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local _x _action _type _i
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_action=$1
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_x=$2
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if [ -z "${_x}" ]; then
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# No IP given. This can happen for the primary address
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# of each address family.
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return
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fi
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# Loop, in case we find a comma separated list, we need to handle
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# each argument on its own.
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while [ ${#_x} -gt 0 ]; do
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case "${_x}" in
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*,*) # Extract the first argument and strip it off the list.
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_i=`expr "${_x}" : '^\([^,]*\)'`
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_x=`expr "${_x}" : "^[^,]*,\(.*\)"`
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;;
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*) _i=${_x}
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_x=""
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;;
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esac
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_type=""
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_iface=""
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_addr=""
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_mask=""
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jail_extract_address "${_i}"
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# make sure we got an address.
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case "${_addr}" in
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"") continue ;;
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*) ;;
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esac
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# Append address to list of addresses for the jail command.
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case "${_addrl}" in
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"") _addrl="${_addr}" ;;
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*) _addrl="${_addrl},${_addr}" ;;
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esac
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# Configure interface alias if requested by a given interface
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# and if we could correctly parse everything.
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case "${_iface}" in
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"") continue ;;
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esac
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case "${_type}" in
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inet) ;;
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inet6) ;;
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*) warn "Could not determine address family. Not going" \
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"to ${_action} address '${_addr}' for ${_jail}."
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continue
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;;
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esac
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case "${_action}" in
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add) ifconfig ${_iface} ${_type} ${_addr}${_mask} alias
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;;
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del) # When removing the IP, ignore the _mask.
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ifconfig ${_iface} ${_type} ${_addr} -alias
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;;
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esac
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done
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}
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# jail_ips {add,del}
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# Extract the comma separated list of addresses and return them
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# for the jail command.
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# Handle more than one address via the _multi option as well.
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# If an interface is given also add/remove an alias for the
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# address with an optional netmask.
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#
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jail_ips()
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{
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local _action
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_action=$1
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case "${_action}" in
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add) ;;
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del) ;;
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*) warn "jail_ips: invalid action '${_action}'"
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return
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;;
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esac
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|
|
|
# Handle addresses.
|
|
jail_handle_ips_option ${_action} "${_ip}"
|
|
# Handle jail_xxx_ip_multi<N>
|
|
alias=0
|
|
while : ; do
|
|
eval _x=\"\$jail_${_jail}_ip_multi${alias}\"
|
|
case "${_x}" in
|
|
"") break ;;
|
|
*) jail_handle_ips_option ${_action} "${_x}"
|
|
alias=$((${alias} + 1))
|
|
;;
|
|
esac
|
|
done
|
|
}
|
|
|
|
jail_start()
|
|
{
|
|
echo -n 'Configuring jails:'
|
|
set_sysctl jail_set_hostname_allow security.jail.set_hostname_allowed \
|
|
set_hostname_allow
|
|
set_sysctl jail_socket_unixiproute_only \
|
|
security.jail.socket_unixiproute_only unixiproute_only
|
|
set_sysctl jail_sysvipc_allow security.jail.sysvipc_allowed \
|
|
sysvipc_allow
|
|
echo '.'
|
|
|
|
echo -n 'Starting jails:'
|
|
_tmp_dir=`mktemp -d /tmp/jail.XXXXXXXX` || \
|
|
err 3 "$name: Can't create temp dir, exiting..."
|
|
for _jail in ${jail_list}
|
|
do
|
|
init_variables $_jail
|
|
if [ -f /var/run/jail_${_jail}.id ]; then
|
|
echo -n " [${_hostname} already running (/var/run/jail_${_jail}.id exists)]"
|
|
continue;
|
|
fi
|
|
_addrl=""
|
|
jail_ips "add"
|
|
if [ -n "${_fib}" ]; then
|
|
_setfib="setfib -F '${_fib}'"
|
|
else
|
|
_setfib=""
|
|
fi
|
|
if checkyesno _mount; then
|
|
info "Mounting fstab for jail ${_jail} (${_fstab})"
|
|
if [ ! -f "${_fstab}" ]; then
|
|
err 3 "$name: ${_fstab} does not exist"
|
|
fi
|
|
jail_mount_fstab
|
|
fi
|
|
if checkyesno _devfs; then
|
|
# If devfs is already mounted here, skip it.
|
|
df -t devfs "${_devdir}" >/dev/null
|
|
if [ $? -ne 0 ]; then
|
|
if is_symlinked_mountpoint ${_devdir}; then
|
|
warn "${_devdir} has symlink as parent - not starting jail ${_jail}"
|
|
continue
|
|
fi
|
|
info "Mounting devfs on ${_devdir}"
|
|
devfs_mount_jail "${_devdir}" ${_ruleset}
|
|
# Transitional symlink for old binaries
|
|
if [ ! -L "${_devdir}/log" ]; then
|
|
__pwd="`pwd`"
|
|
cd "${_devdir}"
|
|
ln -sf ../var/run/log log
|
|
cd "$__pwd"
|
|
fi
|
|
fi
|
|
|
|
# XXX - It seems symlinks don't work when there
|
|
# is a devfs(5) device of the same name.
|
|
# Jail console output
|
|
# __pwd="`pwd`"
|
|
# cd "${_devdir}"
|
|
# ln -sf ../var/log/console console
|
|
# cd "$__pwd"
|
|
fi
|
|
if checkyesno _fdescfs; then
|
|
if is_symlinked_mountpoint ${_fdescdir}; then
|
|
warn "${_fdescdir} has symlink as parent, not mounting"
|
|
else
|
|
info "Mounting fdescfs on ${_fdescdir}"
|
|
mount -t fdescfs fdesc "${_fdescdir}"
|
|
fi
|
|
fi
|
|
if checkyesno _procfs; then
|
|
if is_symlinked_mountpoint ${_procdir}; then
|
|
warn "${_procdir} has symlink as parent, not mounting"
|
|
else
|
|
info "Mounting procfs onto ${_procdir}"
|
|
if [ -d "${_procdir}" ] ; then
|
|
mount -t procfs proc "${_procdir}"
|
|
fi
|
|
fi
|
|
fi
|
|
_tmp_jail=${_tmp_dir}/jail.$$
|
|
|
|
i=0
|
|
while : ; do
|
|
eval out=\"\${_exec_prestart${i}:-''}\"
|
|
[ -z "$out" ] && break
|
|
${out}
|
|
i=$((i + 1))
|
|
done
|
|
|
|
eval ${_setfib} jail ${_flags} -i ${_rootdir} ${_hostname} \
|
|
\"${_addrl}\" ${_exec_start} > ${_tmp_jail} 2>&1
|
|
|
|
if [ "$?" -eq 0 ] ; then
|
|
_jail_id=$(head -1 ${_tmp_jail})
|
|
i=1
|
|
while : ; do
|
|
eval out=\"\${_exec_afterstart${i}:-''}\"
|
|
|
|
if [ -z "$out" ]; then
|
|
break;
|
|
fi
|
|
|
|
jexec "${_jail_id}" ${out}
|
|
i=$((i + 1))
|
|
done
|
|
|
|
echo -n " $_hostname"
|
|
tail +2 ${_tmp_jail} >${_consolelog}
|
|
echo ${_jail_id} > /var/run/jail_${_jail}.id
|
|
|
|
i=0
|
|
while : ; do
|
|
eval out=\"\${_exec_poststart${i}:-''}\"
|
|
[ -z "$out" ] && break
|
|
${out}
|
|
i=$((i + 1))
|
|
done
|
|
else
|
|
jail_umount_fs
|
|
jail_ips "del"
|
|
echo " cannot start jail \"${_jail}\": "
|
|
tail +2 ${_tmp_jail}
|
|
fi
|
|
rm -f ${_tmp_jail}
|
|
done
|
|
rmdir ${_tmp_dir}
|
|
echo '.'
|
|
}
|
|
|
|
jail_stop()
|
|
{
|
|
echo -n 'Stopping jails:'
|
|
for _jail in ${jail_list}
|
|
do
|
|
if [ -f "/var/run/jail_${_jail}.id" ]; then
|
|
_jail_id=$(cat /var/run/jail_${_jail}.id)
|
|
if [ ! -z "${_jail_id}" ]; then
|
|
init_variables $_jail
|
|
|
|
i=0
|
|
while : ; do
|
|
eval out=\"\${_exec_prestop${i}:-''}\"
|
|
[ -z "$out" ] && break
|
|
${out}
|
|
i=$((i + 1))
|
|
done
|
|
|
|
if [ -n "${_exec_stop}" ]; then
|
|
eval env -i /usr/sbin/jexec ${_jail_id} ${_exec_stop} \
|
|
>> ${_consolelog} 2>&1
|
|
fi
|
|
killall -j ${_jail_id} -TERM > /dev/null 2>&1
|
|
sleep 1
|
|
killall -j ${_jail_id} -KILL > /dev/null 2>&1
|
|
jail_umount_fs
|
|
echo -n " $_hostname"
|
|
|
|
i=0
|
|
while : ; do
|
|
eval out=\"\${_exec_poststop${i}:-''}\"
|
|
[ -z "$out" ] && break
|
|
${out}
|
|
i=$((i + 1))
|
|
done
|
|
fi
|
|
jail_ips "del"
|
|
rm /var/run/jail_${_jail}.id
|
|
else
|
|
echo " cannot stop jail ${_jail}. No jail id in /var/run"
|
|
fi
|
|
done
|
|
echo '.'
|
|
}
|
|
|
|
load_rc_config $name
|
|
cmd="$1"
|
|
if [ $# -gt 0 ]; then
|
|
shift
|
|
fi
|
|
if [ -n "$*" ]; then
|
|
jail_list="$*"
|
|
fi
|
|
run_rc_command "${cmd}"
|