374 lines
8.7 KiB
Bash
Executable File
374 lines
8.7 KiB
Bash
Executable File
#!/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 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" ] && echo "blockdevice $device does not exist" && return 1
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## check if we have an existing configpartition
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## TODO: why this config_mount_test?
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# config_mount_test "$device"
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[ ! -x "$WIPE" ] && echo "$WIPE not found" && return 1
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[ ! -x "$SFDISK" ] && echo "$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 || { echo "$a is not supported by kernel" && return 1; }
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done
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mount | grep -q "^$device[ 1-9] " && echo "$device is mounted" && return 1
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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 "$2" > "$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 ($1)"
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cat "$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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$MKFS_CONFIG "$device"
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# mount the config partition rw
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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 >"$CONFIG_MARKER"
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## write (network) interfaces
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cp -a "$CONFIG_DEFAULTS_DIR/." "$CONFIG_DIR"
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# copy stunnel cert
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cp -p "$CERT_TEMP" "$CERT_FILE"
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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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umount "$CONFIG_DIR"
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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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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="$1"
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# flood the crypto partition with noise
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# - not needed -
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#$WIPE -kq -R /dev/urandom "${device}2"
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# passphrase may be passed via command line
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$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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$MKFS_DATA "$CRYPTMAPPER_DEV"
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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 " ${CRYPTO_DIR} "
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}
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function is_init_running()
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{
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ps -e | grep -q -E "$MKFS_DATA|$WIPE"
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}
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function find_harddisk()
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# look for the harddisk to be partitioned
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{
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local dev=$(
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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!" >>"$ERROR_LOG"
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echo -n "$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 echo "Trying to load configuration from $a ..." >&2
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config_mount_test "$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 echo "configuraton found on $device" >&2
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config_set_value "device" "$device"
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return 0
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else echo "failed to locate harddisk" >&2
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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 "$device" ] && error_msg 4 'no valid harddisk found!'
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# passphrase is read from stdin
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$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 /etc/init.d/samba start
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else dmsetup remove "$CRYPTMAPPER_DEV"
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return 1
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fi
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}
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function umount_crypto()
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{
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# do not break on error
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set +e
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/etc/init.d/samba stop
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ps -e | grep -q " smbd$" && 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$" && killall -9 nmbd
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umount "$CRYPTO_DIR"
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$CRYPTSETUP remove "$CRYPTMAPPER_DEV"
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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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umount_crypto || true
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umount "$CONFIG_DIR" || true
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local device=`find_harddisk`
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[ -z "$device" ] && error_msg 4 'no valid harddisk found!'
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initial_checks "$device" || error_msg 5 "Failure during initialisation - bye, bye"
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create_partitions "$device"
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create_config "$device"
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create_crypto "$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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# thuid must be changed at the first time, therfore it needs to be
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# 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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# die cruft option hilft vielleicht bei dem Fehler "interleaved files not (yet) supported"
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mount -o remount,cruft /
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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 "$CONFIG_DIR"
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;;
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network-up )
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kudzu -s -q --class network
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conf_ip=$(config_get_value "ip")
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ifconfig $NET_IFACE "$conf_ip"
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echo "Configured network interface for $NET_IFACE: $conf_ip"
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$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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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 $NET_IFACE | grep Bcast | cut -d ":" -f 3 | cut -d " " -f 1) &>/dev/null
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;;
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network-down )
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$FIREWALL_SCRIPT stop
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killall stunnel
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ifconfig $NET_IFACE down
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;;
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services-up )
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/etc/init.d/thttpd start
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;;
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services-down )
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/etc/init.d/samba stop
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/etc/init.d/thttpd stop
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;;
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box-init )
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# this is good for commandline only, as it takes a lot of time
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init_cryptobox_complete >>"$LOG_FILE" 2>&1
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;;
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box-init-fg )
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# only partitioning and configuration
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# this is nice for the web interface, as it is fast
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# output redirection does not work, as it prevents cryptsetup from asking
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# for a password
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init_cryptobox_part1 >>"$LOG_FILE" 2>&1
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;;
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box-init-bg )
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# do it in the background to provide a smoother web interface
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# messages and errors get written to $LOG_FILE
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# the 'exec' output redirection does not work, if called by a cgi, so
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# redirect it as usual
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init_cryptobox_part2 </dev/null >>"$LOG_FILE" 2>&1 &
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;;
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is_crypto_mounted )
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is_crypto_mounted
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;;
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is_config_mounted )
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is_config_mounted
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;;
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is_init_running )
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is_init_running
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;;
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crypto-mount )
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mount_crypto
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;;
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crypto-umount )
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umount_crypto
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;;
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set_config )
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[ $# -ne 3 ] && error_msg 7 "'set_config' requires two parameters"
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config_set_value "$2" "$3"
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;;
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get_config )
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[ $# -ne 2 ] && error_msg 6 "'get_config' requires exactly one parameter"
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config_get_value "$2"
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;;
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diskinfo )
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$SFDISK -L -q -l `find_harddisk`
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;;
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get_current_ip )
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get_current_ip
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;;
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is_harddisk_available )
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[ -z "$(find_harddisk)" ] && exit 1
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exit 0
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;;
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* )
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# TODO: update this!
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echo "Syntax: `basename $0` { mount_config | umount_config | init }"
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echo
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;;
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esac
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