482 lines
13 KiB
Bash
482 lines
13 KiB
Bash
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#!/bin/sh
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#
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# this script does EVERYTHING
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# all other scripts are only frontends :)
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#
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# called by:
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# - some rc-scripts
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# - the web frontend cgi
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#
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set -eu
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# parse config file
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. /etc/cryptobox/cryptobox.conf
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## configuration
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CONFIG_MARKER="$CONFIG_DIR/cryptobox.marker"
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CERT_TEMP=/tmp/stunnel.pem
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#####
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function log_msg()
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{
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# the log file is not writable during boot - try before writing ...
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[ -w "$LOG_FILE" ] || return 0
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echo >>"$LOG_FILE"
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echo "##### `date` #####" >>"$LOG_FILE"
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echo "$1" >>"$LOG_FILE"
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}
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function error_msg()
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# parameters: ExitCode ErrorMessage
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{
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echo "[`date`] - $2" | tee -a "$LOG_FILE" >&2
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# print the execution stack - not usable with busybox
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#caller | sed 's/^/\t/' >&2
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exit "$1"
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}
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function initial_checks()
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# Parameter: device
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{
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local device="$1"
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[ ! -b "$device" ] && log_msg "blockdevice $device does not exist" && return 1
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[ ! -x "$WIPE" ] && log_msg "$WIPE not found" && return 1
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[ ! -x "$SFDISK" ] && log_msg "$SFDISK not found" && return 1
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for a in $ALGO $HASH
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do grep -q "^name *: $a$" /proc/crypto || modprobe "$a"
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grep -q "^name *: $a$" /proc/crypto || { log_msg "$a is not supported by kernel" && return 1; }
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done
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log_msg "inital checks successful"
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return 0
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}
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function create_partitions()
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# Parameter: device
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{
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local device="$1"
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# first partition size is 1 sector, second goes til end
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# sfdisk -n doesn't actually write (for testing purpose)
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echo -e "0,1,L \n,,L\n" | $SFDISK "$device"
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}
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function config_set_value()
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# parameters: SettingName SettingValue
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{
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mount -o rw,remount "$CONFIG_DIR"
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echo -n "$2" > "$CONFIG_DIR/$1"
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mount -o ro,remount "$CONFIG_DIR"
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}
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function config_get_value()
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# parameters: SettingName
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{
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# use mounted config, if it exists - otherwise use defaults
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local conf_dir
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if is_config_mounted
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then conf_dir=$CONFIG_DIR
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else conf_dir=$CONFIG_DEFAULTS_DIR
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fi
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[ -z "$1" ] && error_msg 1 "empty setting name"
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[ ! -e "$conf_dir/$1" ] && error_msg 2 "unknown configuration value ($1)"
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# remove trailing line break
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echo -n $(cat "$conf_dir/$1")
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}
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function create_config()
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# Parameter: device
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{
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local device="${1}1"
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log_msg "Creating config filesystem ..."
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# filter output through 'tr' to replace tabs
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$MKFS_CONFIG "$device" | tr '\010' ' '
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# mount the config partition rw
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log_msg "Mounting config partition ..."
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mount "$device" "$CONFIG_DIR"
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# create a marker to recognize a cryptobox partition
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date -I >"$CONFIG_MARKER"
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log_msg "Copying configuration defaults ..."
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cp -a "$CONFIG_DEFAULTS_DIR/." "$CONFIG_DIR"
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log_msg "Copying temporary cerificate file to config filesystem ..."
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# beware: the temp file should always be there - even after reboot - see "mount_config"
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cp -p "$CERT_TEMP" "$CERT_FILE"
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log_msg "Setting inital values ..."
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# beware: config_set_value remounts the config partition read-only
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config_set_value "device" "$1"
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config_set_value "ip" "$(get_current_ip)"
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# reinitialise configuration
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log_msg "Unmounting config partition ..."
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umount "$CONFIG_DIR"
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log_msg "Reload configuration ..."
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mount_config
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}
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function get_current_ip()
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# not necessarily the same as configured (necessary for validation)
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{
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# filter the output of ifconfig and remove trailing line break
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echo -n $(ifconfig $NET_IFACE | grep "inet" | cut -d ":" -f2 | cut -d " " -f1)
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}
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function create_crypto()
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# Parameter: device
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{
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local device="$1"
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# passphrase may be passed via command line
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$CRYPTSETUP -h "$HASH" -c "$ALGO" create "`basename $CRYPTMAPPER_DEV`" "${device}2"
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}
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function mkfs_crypto()
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# split from create_crypto to allow background execution via web interface
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{
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local device=$(find_harddisk)
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# flood the crypto partition with noise
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# writing to the real partition is faster
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# TODO: this takes _much_ too long - maybe add a "secure wipe" switch to the interface?
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#dd if=/dev/urandom of="${device}2" bs=512
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# filter output through 'tr' to replace tabs
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$MKFS_DATA "$CRYPTMAPPER_DEV" | tr '\0101' ' '
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}
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function config_mount_test()
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# Parameter: device
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{
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local device="${1}"
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local STATUS=0
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mount "${device}1" "$CONFIG_DIR" &>/dev/null || true
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is_config_mounted && STATUS=1
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umount "$CONFIG_DIR" &>/dev/null || true
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# return code is the result of this expression
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[ 1 -eq "$STATUS" ] && return 0
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return 1
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}
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function is_config_mounted()
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{
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mount | grep -q " ${CONFIG_DIR} " && [ -f "$CONFIG_MARKER" ]
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}
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function is_crypto_mounted()
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{
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mount | grep -q " ${CRYPTO_DIR} "
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}
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function is_init_running()
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{
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check_at_command_queue " box-init-bg"
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}
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# check if a specified command is in an at-queue
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# Parameter: a regular expression of the commandline
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# Return: the command is part of an at-queue (0) or not (1)
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function check_at_command_queue()
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{
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# 1) get the available job numbers
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# 2) remove empty lines (especially the last one)
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# 3) check every associated command for the regexp
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at -l | cut -f 1 | while read jobnum
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do at -c $jobnum | sed '/^$/d' | tail -1
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done | grep -q "$1"
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}
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function find_harddisk()
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# look for the harddisk to be partitioned
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{
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local dev=$(
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if is_config_mounted
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then config_get_value "device"
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else for a in $SCAN_DEVICES
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do grep -q " `basename $a`$" /proc/partitions && echo "$a" && break
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done
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fi )
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[ -z "$dev" ] && echo "no valid partition for initialisation found!" >>"$LOG_FILE"
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echo -n "$dev"
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}
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function mount_config()
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{
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is_config_mounted && error_msg 3 "configuration directory ($CONFIG_DIR) is already mounted!"
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local device=$(
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for a in $SCAN_DEVICES
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do log_msg "Trying to load configuration from $a ..."
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config_mount_test "$a" && echo "$a" && break
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done )
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if [ -n "$device" ] && mount "${device}1" "$CONFIG_DIR"
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then log_msg "configuraton found on $device"
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config_set_value "device" "$device"
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# copy certificate to /tmp in case of re-initialization
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# /tmp should be writable, so tmpfs has to be mounted before (/etc/rcS.d)
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cp "$CERT_FILE" "$CERT_TEMP"
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return 0
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else log_msg "failed to locate harddisk"
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return 1
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fi
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}
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function mount_crypto()
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{
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is_crypto_mounted && echo "Das Crypto-Dateisystem ist bereits aktiv!" && return
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local device=`find_harddisk`
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[ -z "$device" ] && error_msg 4 'no valid harddisk found!'
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# passphrase is read from stdin
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log_msg "Mounting crypto partition ..."
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$CRYPTSETUP -h "$HASH" -c "$ALGO" create "`basename $CRYPTMAPPER_DEV`" "${device}2"
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if mount "$CRYPTMAPPER_DEV" "$CRYPTO_DIR"
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then log_msg "Mount succeded - now starting samba ..."
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/etc/init.d/samba start
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else log_msg "Mount failed - removing dev-mapper ..."
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dmsetup remove $(basename $CRYPTMAPPER_DEV)
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return 1
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fi
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}
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function umount_crypto()
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{
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# do not break on error
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set +e
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if ps -e | grep -q " [sn]mbd$"
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then log_msg "Stopping samba ..."
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/etc/init.d/samba stop
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ps -e | grep -q " smbd$" && killall smbd
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ps -e | grep -q " nmbd$" && killall nmbd
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ps -e | grep -q " smbd$" && killall -9 smbd
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ps -e | grep -q " nmbd$" && killall -9 nmbd
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fi
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if mount | grep -q " $CRYPTO_DIR "
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then log_msg "Unmounting crypto partition ..."
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umount "$CRYPTO_DIR"
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fi
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if [ -e "$CRYPTMAPPER_DEV" ]
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then log_msg "Removing dev-mapper ..."
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$CRYPTSETUP remove $(basename $CRYPTMAPPER_DEV)
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fi
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set -e
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}
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function init_cryptobox_part1()
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# this is only the first part of initialisation that takes no time - good for a smooth web interface
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{
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local device=$(find_harddisk)
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[ -z "$device" ] && log_msg 'no valid harddisk found!' && return 1
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(
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log_msg "Initializing crypto partition on $device ..."
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umount_crypto || true
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mount | grep -q " $CONFIG_DIR " && umount "$CONFIG_DIR" || true
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initial_checks "$device" || return 1
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create_partitions "$device"
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create_config "$device"
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) >>"$LOG_FILE" 2>&1
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# the output of create_crypto may NOT be redirected - this would prevent cryptsetup from
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# reading the passphrase from stdin
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log_msg "Creating the crypto partition ..."
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create_crypto "$device"
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}
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function init_cryptobox_part2()
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# some things to be done in the background
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# these are the final steps of initialisation
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# the uid must be changed initially, therfore it needs to be mounted
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{
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mkfs_crypto
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mount "$CRYPTMAPPER_DEV" "$CRYPTO_DIR"
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chown $SAMBA_USER "$CRYPTO_DIR"
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umount_crypto
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}
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function init_cryptobox_complete()
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{
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init_cryptobox_part1
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init_cryptobox_part2
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}
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### main ###
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# set PATH because thttpd removes /sbin and /usr/sbin for cgis
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export PATH=/usr/sbin:/usr/bin:/sbin:/bin
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ACTION=help
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[ $# -gt 0 ] && ACTION="$1"
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case "$ACTION" in
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config-up )
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if mount_config
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then echo "Cryptobox configuration successfully loaded"
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else error_msg 3 "Could not find a configuration partition!"
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fi
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;;
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config-down )
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umount "$CONFIG_DIR" || error_msg 4 "Could not unmount configuration partition"
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;;
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network-up )
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kudzu -s -q --class network
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conf_ip=$(config_get_value "ip")
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ifconfig $NET_IFACE "$conf_ip"
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log_msg "Configured $NET_IFACE for $conf_ip ..."
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echo "Configured network interface for $NET_IFACE: $conf_ip"
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log_msg "Starting the firewall ..."
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"$FIREWALL_SCRIPT" start
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# start stunnel
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if [ -f "$CERT_FILE" ]
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then USE_CERT=$CERT_FILE
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else USE_CERT=$CERT_TEMP
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$MAKE_CERT_SCRIPT "$CERT_TEMP" >>"$LOG_FILE" 2>&1
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fi
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log_msg "Starting stunnel ..."
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stunnel -p "$USE_CERT" -r localhost:80 -d 443 \
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|| echo "$USE_CERT not found - not starting stunnel"
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# this ping allows other hosts to get the IP of
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# the box, in case of misconfiguration
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ping -b -c 1 $(ifconfig $NET_IFACE | grep Bcast | cut -d ":" -f 3 | cut -d " " -f 1) &>/dev/null
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;;
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network-down )
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log_msg "Stopping the firewall ..."
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"$FIREWALL_SCRIPT" stop
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log_msg "Stopping stunnel ..."
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killall stunnel
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log_msg "Shutting the network interface down ..."
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ifconfig $NET_IFACE down
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;;
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services-up )
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# is something special necessary?
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;;
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services-down )
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/etc/init.d/samba stop
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/etc/init.d/thttpd stop
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;;
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crypto-up )
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mount_crypto
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;;
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crypto-down )
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umount_crypto
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;;
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box-init )
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# do complete initialization
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"$0" box-init-fg
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# the background part will recall itself as an at-command
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"$0" box-init-bg
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;;
|
||
|
|
box-init-fg )
|
||
|
|
# only partitioning and configuration
|
||
|
|
# this is nice for the web interface, as it is fast
|
||
|
|
# output redirection does not work, as it prevents cryptsetup from asking
|
||
|
|
# for a password
|
||
|
|
init_cryptobox_part1
|
||
|
|
;;
|
||
|
|
box-init-bg )
|
||
|
|
# do it in the background to provide a smoother web interface
|
||
|
|
# messages and errors get written to $LOG_FILE
|
||
|
|
|
||
|
|
# make sure, that this is always called via 'at':
|
||
|
|
if check_at_command_queue " box-init-bg"
|
||
|
|
then init_cryptobox_part2 </dev/null >>"$LOG_FILE" 2>&1
|
||
|
|
else echo -n "'$0' box-init-bg" | at now
|
||
|
|
fi
|
||
|
|
;;
|
||
|
|
is_crypto_mounted )
|
||
|
|
is_crypto_mounted
|
||
|
|
;;
|
||
|
|
is_config_mounted )
|
||
|
|
is_config_mounted
|
||
|
|
;;
|
||
|
|
is_init_running )
|
||
|
|
is_init_running
|
||
|
|
;;
|
||
|
|
is_harddisk_available )
|
||
|
|
[ -z "$(find_harddisk)" ] && exit 1
|
||
|
|
exit 0
|
||
|
|
;;
|
||
|
|
update_ip_address )
|
||
|
|
# reconfigure the network interface to a new IP address
|
||
|
|
# wait for 5 seconds to finish present http requests
|
||
|
|
echo -n "sleep 5; ifconfig $NET_IFACE `config_get_value ip`" | at now
|
||
|
|
;;
|
||
|
|
get_current_ip )
|
||
|
|
get_current_ip
|
||
|
|
;;
|
||
|
|
set_config )
|
||
|
|
[ $# -ne 3 ] && error_msg 7 "'set_config' requires two parameters"
|
||
|
|
config_set_value "$2" "$3"
|
||
|
|
;;
|
||
|
|
get_config )
|
||
|
|
[ $# -ne 2 ] && error_msg 6 "'get_config' requires exactly one parameter"
|
||
|
|
config_get_value "$2"
|
||
|
|
;;
|
||
|
|
diskinfo )
|
||
|
|
$SFDISK -L -q -l `find_harddisk`
|
||
|
|
;;
|
||
|
|
poweroff )
|
||
|
|
is_crypto_mounted && umount_crypto
|
||
|
|
log_msg "Turning off the CryptoBox ..."
|
||
|
|
echo "poweroff" | at now
|
||
|
|
;;
|
||
|
|
reboot )
|
||
|
|
is_crypto_mounted && umount_crypto
|
||
|
|
log_msg "Rebooting the CryptoBox ..."
|
||
|
|
echo "reboot" | at now
|
||
|
|
;;
|
||
|
|
clean )
|
||
|
|
# only for development
|
||
|
|
log_msg "Cleaning the CryptoBox ..."
|
||
|
|
device=$(find_harddisk)
|
||
|
|
$0 crypto-down
|
||
|
|
$0 config-down
|
||
|
|
# TODO: test this!
|
||
|
|
echo -e ";\n;\n;\n;\n" | $SFDISK "$device"
|
||
|
|
;;
|
||
|
|
* )
|
||
|
|
echo "Syntax: `basename $0` ACTION [PARAMS]"
|
||
|
|
echo " config-up - scan for configuration partition and mount it"
|
||
|
|
echo " config-down - unmount configuration partition"
|
||
|
|
echo " network-up - enable network interface"
|
||
|
|
echo " network-down - disable network interface"
|
||
|
|
echo " services-up - run some cryptobox specific daemons"
|
||
|
|
echo " services-down - stop some cryptobox specific daemons"
|
||
|
|
echo " crypto-up - mount crypto partition and start samba"
|
||
|
|
echo " crypto-down - unmount crypto partition and stop samba"
|
||
|
|
echo " box-init - initialize cryptobox (ALL data is LOST)"
|
||
|
|
echo " box-init-fg - the first part of initialization"
|
||
|
|
echo " box-init-bg - the last part of initialization (background)"
|
||
|
|
echo " is_crypto_mounted - check, if crypto partition is mounted"
|
||
|
|
echo " is_config_mounted - check, if configuration partition is mounted"
|
||
|
|
echo " is_init_running - check, if initialization is ongoing"
|
||
|
|
echo " is_harddisk_available - check, if there is a usable harddisk"
|
||
|
|
echo " get_current_ip - get the current IP of the network interface"
|
||
|
|
echo " update_ip_address - update the network interface after reconfiguration"
|
||
|
|
echo " set_config NAME VALUE - change a configuration setting"
|
||
|
|
echo " get_config NAME - retrieve a configuration setting"
|
||
|
|
echo " diskinfo - show the partition table of the harddisk"
|
||
|
|
echo " poweroff - shutdown the cryptobox"
|
||
|
|
echo " clean - remove all partitions [only for development]"
|
||
|
|
echo " reboot - reboot the cryptobox"
|
||
|
|
echo
|
||
|
|
;;
|
||
|
|
esac
|