initramfs-tools-hook

#!/bin/sh

# This script will be run by 'mkinitramfs' when it creates the image.
# Its job is to decide which files to install, then install them into
# the staging area, where the initramfs is being created.  This
# happens when a new 'linux-image' package is installed, or when an
# administrator runs 'update-initramfs' by hand to update an initramfs
# image.

# The environment contains at least:
#
#  DESTDIR -- The staging directory where the image is being built.

# No initramfs pre-requirements
PREREQ="cryptroot"

prereqs()
{
	echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
	prereqs
	exit 0
	;;
esac

. /usr/share/initramfs-tools/hook-functions

for d in /usr/lib \
    "/usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null`" \
    "`rpm --eval='%{_libdir}' 2>/dev/null`" /usr/local/lib; do
    if [ -d "$d"/mandos ]; then
	libdir="$d"
	break
    fi
done
if [ -z "$libdir" ]; then
    # Mandos not found
    exit 1
fi

for d in /etc/keys/mandos /etc/mandos/keys; do
    if [ -d "$d" ]; then
	keydir="$d"
	break
    fi
done
if [ -z "$keydir" ]; then
    # Mandos key directory not found
    exit 1
fi

set `{ getent passwd _mandos \
    || getent passwd nobody \
    || echo ::65534:65534:::; } \
    | cut --delimiter=: --fields=3,4 --only-delimited \
    --output-delimiter=" "`
mandos_user="$1"
mandos_group="$2"

# The Mandos network client uses the network
auto_add_modules net
# The Mandos network client uses IPv6
force_load ipv6

# These are directories inside the initrd
CONFDIR="/conf/conf.d/mandos"
MANDOSDIR="/lib/mandos"
PLUGINDIR="${MANDOSDIR}/plugins.d"
PLUGINHELPERDIR="${MANDOSDIR}/plugin-helpers"
HOOKDIR="${MANDOSDIR}/network-hooks.d"

# Make directories
install --directory --mode=u=rwx,go=rx "${DESTDIR}${CONFDIR}" \
	"${DESTDIR}${MANDOSDIR}" "${DESTDIR}${HOOKDIR}"
install --owner=${mandos_user} --group=${mandos_group} --directory \
	--mode=u=rwx "${DESTDIR}${PLUGINDIR}" \
	"${DESTDIR}${PLUGINHELPERDIR}"

copy_exec "$libdir"/mandos/mandos-to-cryptroot-unlock "${MANDOSDIR}"

# Copy the Mandos plugin runner
copy_exec "$libdir"/mandos/plugin-runner "${MANDOSDIR}"

# Copy the plugins

# Copy the packaged plugins
for file in "$libdir"/mandos/plugins.d/*; do
    base="`basename \"$file\"`"
    # Is this plugin overridden?
    if [ -e "/etc/mandos/plugins.d/$base" ]; then
	continue
    fi
    case "$base" in
	*~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
	    : ;;
	"*") echo "W: Mandos client plugin directory is empty." >&2 ;;
	*) copy_exec "$file" "${PLUGINDIR}" ;;
    esac
done

# Copy the packaged plugin helpers
for file in "$libdir"/mandos/plugin-helpers/*; do
    base="`basename \"$file\"`"
    # Is this plugin overridden?
    if [ -e "/etc/mandos/plugin-helpers/$base" ]; then
	continue
    fi
    case "$base" in
	*~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
	    : ;;
	"*") : ;;
	*) copy_exec "$file" "${PLUGINHELPERDIR}" ;;
    esac
done

# Copy any user-supplied plugins
for file in /etc/mandos/plugins.d/*; do
    base="`basename \"$file\"`"
    case "$base" in
	*~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
	    : ;;
	"*") : ;;
	*) copy_exec "$file" "${PLUGINDIR}" ;;
    esac
done

# Copy any user-supplied plugin helpers
for file in /etc/mandos/plugin-helpers/*; do
    base="`basename \"$file\"`"
    case "$base" in
	*~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
	    : ;;
	"*") : ;;
	*) copy_exec "$file" "${PLUGINHELPERDIR}" ;;
    esac
done

# Get DEVICE from initramfs.conf and other files
. /etc/initramfs-tools/initramfs.conf
for conf in /etc/initramfs-tools/conf.d/*; do
    if [ -n `basename \"$conf\" | grep '^[[:alnum:]][[:alnum:]\._-]*$' \
	| grep -v '\.dpkg-.*$'` ]; then
	[ -f "${conf}" ] && . "${conf}"
    fi
done
export DEVICE

# Copy network hooks
for hook in /etc/mandos/network-hooks.d/*; do
    case "`basename \"$hook\"`" in
	"*") continue ;;
	*[!A-Za-z0-9_.-]*) continue ;;
	*) test -d "$hook" || copy_exec "$hook" "${HOOKDIR}" ;;
    esac
    if [ -x "$hook" ]; then
        # Copy any files needed by the network hook
	MANDOSNETHOOKDIR=/etc/mandos/network-hooks.d MODE=files \
	    VERBOSITY=0 "$hook" files | while read -r file target; do
	    if [ ! -e "${file}" ]; then
		echo "WARNING: file ${file} not found, requested by Mandos network hook '${hook##*/}'" >&2
	    fi
	    if [ -z "${target}" ]; then
		copy_exec "$file"
	    else
		copy_exec "$file" "$target"
	    fi
	done
        # Copy and load any modules needed by the network hook
	MANDOSNETHOOKDIR=/etc/mandos/network-hooks.d MODE=modules \
	    VERBOSITY=0 "$hook" modules | while read -r module; do
	    force_load "$module"
	done
    fi
done

# GPGME needs GnuPG
gpg=/usr/bin/gpg
libgpgme11_version="`dpkg-query --showformat='${Version}' --show libgpgme11`"
if dpkg --compare-versions "$libgpgme11_version" ge 1.5.0-0.1; then
    if [ -e /usr/bin/gpgconf ]; then
	if [ ! -e "${DESTDIR}/usr/bin/gpgconf" ]; then
	    copy_exec /usr/bin/gpgconf
	fi
	gpg="`/usr/bin/gpgconf|sed --quiet --expression='s/^gpg:[^:]*://p'`"
	gpgagent="`/usr/bin/gpgconf|sed --quiet --expression='s/^gpg-agent:[^:]*://p'`"
	# Newer versions of GnuPG 2 requires the gpg-agent binary
	if [ -e "$gpgagent" ] && [ ! -e "${DESTDIR}$gpgagent" ]; then
	    copy_exec "$gpgagent"
	fi
    fi
elif dpkg --compare-versions "$libgpgme11_version" ge 1.4.1-0.1; then
    gpg=/usr/bin/gpg2
fi
if [ ! -e "${DESTDIR}$gpg" ]; then
    copy_exec "$gpg"
fi
unset gpg
unset libgpgme11_version

# Config files
for file in /etc/mandos/plugin-runner.conf; do
    if [ -d "$file" ]; then
	continue
    fi
    cp --archive --sparse=always "$file" "${DESTDIR}${CONFDIR}"
done

if [ ${mandos_user} != 65534 ]; then
    sed --in-place --expression="1i--userid=${mandos_user}" \
	"${DESTDIR}${CONFDIR}/plugin-runner.conf"
fi

if [ ${mandos_group} != 65534 ]; then
    sed --in-place --expression="1i--groupid=${mandos_group}" \
	"${DESTDIR}${CONFDIR}/plugin-runner.conf"
fi

# Key files
for file in "$keydir"/*; do
    if [ -d "$file" ]; then
	continue
    fi
    case "$file" in
	*~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
	    : ;;
	"*") : ;;
	*)
	    cp --archive --sparse=always "$file" \
	       "${DESTDIR}${CONFDIR}"
	    chown ${mandos_user}:${mandos_group} \
		  "${DESTDIR}${CONFDIR}/`basename \"$file\"`"
	    ;;
    esac
done
# Use Diffie-Hellman parameters file if available
if [ -e "${DESTDIR}${CONFDIR}"/dhparams.pem ]; then
    sed --in-place \
	--expression="1i--options-for=mandos-client:--dh-params=${CONFDIR}/dhparams.pem" \
	"${DESTDIR}/${CONFDIR}/plugin-runner.conf"
fi

# /lib/mandos/plugin-runner will drop priviliges, but needs access to
# its plugin directory and its config file.  However, since almost all
# files in initrd have been created with umask 027, this opening of
# permissions is needed.
# 
# (The umask is not really intended to affect the files inside the
# initrd; it is intended to affect the initrd.img file itself, since
# it now contains secret key files.  There is, however, no other way
# to set the permission of the initrd.img file without a race
# condition.  This umask is set by "initramfs-tools-conf", installed
# as "/usr/share/initramfs-tools/conf.d/mandos-conf".)
# 
for full in "${MANDOSDIR}" "${CONFDIR}"; do
    while [ "$full" != "/" ]; do
	chmod a+rX "${DESTDIR}$full"
	full="`dirname \"$full\"`"
    done
done

# Reset some other things to sane permissions which we have
# inadvertently affected with our umask setting.
for dir in / /bin /etc /keyscripts /sbin /scripts /usr /usr/bin; do
    if [ -d "${DESTDIR}$dir" ]; then
	chmod a+rX "${DESTDIR}$dir"
    fi
done
for dir in "${DESTDIR}"/lib* "${DESTDIR}"/usr/lib*; do
    if [ -d "$dir" ]; then
	find "$dir" \! -perm -u+rw,g+r -prune -or \! -type l -print0 \
	    | xargs --null --no-run-if-empty chmod a+rX --
    fi
done