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|
#!/bin/sh -
# $Id$
#
# Create a chroot jail for rcynic.
#
# This is approximately what a package installation script might do.
: ${jaildir="${DESTDIR}/var/rcynic"}
: ${jailuser="rcynic"}
: ${jailgroup="rcynic"}
: ${setupcron="NO"}
echo "Checking whether we are running under fakeroot"
if test `whoami` = `(unset LD_PRELOAD; whoami)`
then
running_fakeroot=no
else
running_fakeroot=yes
fi
echo "Setting up \"${jaildir}\" as a chroot jail for rcynic."
if test $running_fakeroot = yes
then
echo "Running under fakeroot, so skipping ${jailgroup} group setup"
elif ${AWK} -F: -v jailgroup="${jailgroup}" 'BEGIN {status = 1} $1 == jailgroup {status = 0} END {exit status}' /etc/group
then
echo "You already have a group \"${jailgroup}\", so I will use it."
elif /usr/sbin/groupadd ${jailgroup}
then
echo "Added group \"${jailgroup}\"."
else
echo "Adding group \"${jailgroup}\" failed..."
echo "Please create it, then try again."
exit 1
fi
# The adduser program on CentOS 5.x uses the -n flag instead of -N to
# avoid creating the associated group.
nogroup='-N'
if test -f /etc/redhat-release; then
read vendor release version < /etc/redhat-release
if test $vendor = CentOS; then
nogroup='-n'
fi
fi
if test $running_fakeroot = yes
then
echo "Running under fakeroot, so skipping ${jailuser} user setup"
elif ${AWK} -F: -v jailuser="${jailuser}" 'BEGIN {status = 1} $1 == jailuser {status = 0} END {exit status}' /etc/passwd
then
echo "You already have a user \"${jailuser}\", so I will use it."
elif /usr/sbin/useradd -g ${jailgroup} -M $nogroup -d "${jaildir}" -s /sbin/nologin -c "RPKI validation system" ${jailuser}
then
echo "Added user \"${jailuser}\"."
else
echo "Adding user \"${jailuser}\" failed..."
echo "Please create it, then try again."
exit 1
fi
# test for x86_64 target
if test -d /lib64; then
libdir=/lib64
else
libdir=/lib
fi
echo "Building directories"
if ! /bin/mkdir -p -v -m 555 \
"${jaildir}/bin" \
"${jaildir}/dev" \
"${jaildir}/etc/trust-anchors" \
"${jaildir}/${libdir}" \
"${jaildir}/usr/lib" \
"${jaildir}/data"
then
echo "Unable to build directories under \"${jaildir}\", please fix this then try again."
exit 1
fi
echo "Installing device inodes"
if ! (cd /dev; /bin/ls null zero random urandom | /bin/cpio -puv "${jaildir}/dev")
then
echo "Unable to install device inodes in ${jaildir}/dev/, please fix this then try again"
exit 1
fi
echo "Copying files from /etc"
for i in /etc/localtime /etc/resolv.conf /etc/passwd /etc/group
do
j="${jaildir}${i}"
if test -r "$i" &&
! /usr/bin/cmp -s "$i" "$j" &&
! /bin/cp -p "$i" "$j"
then
echo "Unable to copy $i to ${jaildir}, please fix this then try again"
exit 1
fi
done
echo "Whacking file permissions"
if ! /bin/chmod -R a-w "${jaildir}/bin" "${jaildir}/etc" ||
! /bin/chmod -R 755 "${jaildir}/data" ||
( test -f "${jaildir}/etc/rsa_key" && ! /bin/chmod 400 "${jaildir}/etc/rsa_key" )
then
echo "Unable to set file permissions correctly, please fix this and try again"
exit 1
fi
if test $running_fakeroot = yes
then
echo "Running under fakeroot, so skipping chown calls"
elif ! /bin/chown -R root:root "${jaildir}/bin" "${jaildir}/etc" ||
! /bin/chown -R "${jailuser}:${jailgroup}" "${jaildir}/data" ||
( test -f "${jaildir}/etc/rsa_key" && ! /bin/chown "${jailuser}" "${jaildir}/etc/rsa_key" )
then
echo "Unable to set file ownership correctly, please fix this and try again"
exit 1
fi
if test -r "$jaildir/etc/rcynic.conf"; then
echo "You already have config file \"${jaildir}/etc/rcynic.conf\", so I will use it."
elif /usr/bin/install -m 444 -o root -g root -p ../sample-rcynic.conf "${jaildir}/etc/rcynic.conf"; then
echo "Installed minimal ${jaildir}/etc/rcynic.conf, adding SAMPLE trust anchors"
for i in ../../sample-trust-anchors/*.tal; do
j="$jaildir/etc/trust-anchors/${i##*/}"
test -r "$i" || continue
test -r "$j" && continue
echo "Installing $i as $j"
/usr/bin/install -m 444 -o root -g root -p "$i" "$j"
done
j=1
for i in $jaildir/etc/trust-anchors/*.tal; do
echo >>"${jaildir}/etc/rcynic.conf" "trust-anchor-locator.$j = /etc/trust-anchors/${i##*/}"
j=$((j+1))
done
else
echo "Installing minimal ${jaildir}/etc/rcynic.conf failed"
exit 1
fi
echo "Installing rcynic as ${jaildir}/bin/rcynic"
/usr/bin/install -m 555 -o root -g root -p ../../rcynic "${jaildir}/bin/rcynic"
if test -x "$jaildir/bin/rsync"; then
echo "You already have an executable \"$jaildir/bin/rsync\", so I will use it"
elif /usr/bin/install -m 555 -o root -g root -p /usr/bin/rsync "${jaildir}/bin/rsync"; then
echo "Installed ${jaildir}/bin/rsync"
else
echo "Installing ${jaildir}/bin/rsync failed"
exit 1
fi
echo "Copying required shared libraries"
shared_libraries="${jaildir}/bin/rcynic ${jaildir}/bin/rsync $(/usr/bin/find ${libdir} -name 'libnss*.so*' -print)"
while true
do
closure="$(/usr/bin/ldd ${shared_libraries} |
${AWK} -v "rcynic=${jaildir}/bin/rcynic" -v "rsync=${jaildir}/bin/rsync" '
{
sub(/:$/, "");
}
$0 == rcynic || $0 == rsync || $1 ~ /\/ld-linux\.so/ {
next;
}
{
for (i = 1; i <= NF; i++)
if ($i ~ /^\//)
print $i;
}
' |
${SORT} -u)"
if test "x$shared_libraries" = "x$closure"
then
break
else
shared_libraries="$closure"
fi
done
# Under CentOS 5.5, rsync requires libresolv, but ldd doesn't show
# it.
if test -f ${libdir}/libresolv.so.2; then
shared_libraries="${shared_libraries} ${libdir}/libresolv.so.2"
fi
for shared in ${libdir}/*ld*.so* $shared_libraries
do
if test -r "${jaildir}/${shared}"
then
echo "You already have a \"${jaildir}${shared}\", so I will use it"
elif /usr/bin/install -m 555 -o root -g root -d "${jaildir}${shared%/*}" &&
/usr/bin/install -m 555 -o root -g root -p "${shared}" "${jaildir}${shared}"
then
echo "Copied ${shared} into ${jaildir}"
else
echo "Unable to copy ${shared} into ${jaildir}"
exit 1
fi
done
if /usr/bin/install -m 555 -o root -g root -p ../../rcynic-html "${jaildir}/bin/rcynic-html"; then
echo "Installed rcynic.py as \"${jaildir}/bin/rcynic-html\""
else
echo "Installing rcynic-html failed"
exit 1
fi
if test $running_fakeroot = yes
then
setupcron=NO
fi
case "$setupcron" in
YES|yes)
echo "Setting up root's crontab to run jailed rcynic"
/usr/bin/crontab -l -u root 2>/dev/null |
${AWK} -v "jailuser=$jailuser" -v "jailgroup=$jailgroup" -v "jaildir=$jaildir" '
BEGIN {
cmd = "exec /usr/sbin/chroot --userspec=" jailuser ":" jailgroup " " jaildir;
cmd = cmd " /bin/rcynic -c /etc/rcynic.conf";
}
$0 !~ cmd {
print;
}
END {
"/usr/bin/hexdump -n 2 -e \"\\\"%u\\\\\\n\\\"\" /dev/random" | getline;
printf "%u * * * *\t%s\n", $1 % 60, cmd;
}' |
/usr/bin/crontab -u root -
/bin/cat <<EOF
crontab is set up to run rcynic hourly, at a randomly selected
minute (to spread load on the rsync servers). Please do NOT
adjust this to run on the hour. In particular please do NOT
adjust this to run at midnight UTC.
EOF
;;
*)
/bin/cat <<EOF
You'll need to add a crontab entry running one of the the following command as root:
/usr/sbin/chroot --userspec $jailuser:$jailgroup $jaildir /bin/rcynic -c /etc/rcynic.conf
/usr/bin/chrootuid $jaildir rcynic /bin/rcynic -c /etc/rcynic.conf
We recommend the latter, as chrootuid has proven more reliable for us than the chroot
program that is included on some GNU/Linux platforms.
Please try to pick a random time for this, don't just run it on the hour,
or at local midnight, or, worst of all, at midnight UTC.
EOF
;;
esac
/bin/cat <<EOF
Jail set up. You may need to customize $jaildir/etc/rcynic.conf.
If you did not install your own trust anchors, a default set
of SAMPLE trust anchors may have been installed for you, but
you, the relying party, are the only one who can decide
whether you trust those anchors. rcynic will not do anything
useful without good trust anchors.
EOF
|
