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49-sshd: create dropin file instead of using sed #245

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49-sshd: create dropin file instead of using sed #245

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28 changes: 6 additions & 22 deletions etc/grml/fai/config/scripts/GRMLBASE/49-sshd
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Original file line number Diff line number Diff line change
Expand Up @@ -17,28 +17,12 @@ if ! [ -r "${target}/etc/ssh/sshd_config" ] ; then
exit 0
fi

# make sure root login works, it's set to "without-password" since openssh-server v1:6.6p1-1
# and defaults to "prohibit-password" since openssh-server v1:7.1p1-1
if grep -q '^PermitRootLogin ' "${target}/etc/ssh/sshd_config" ; then
# make sure we don't modify our own disabled snippet once again
if ! grep -q 'PermitRootLogin .*disabled via grml-live' "${target}/etc/ssh/sshd_config" ; then
sed -i "s/^\(PermitRootLogin .*\)/# \1 # disabled via grml-live\nPermitRootLogin yes/" "${target}/etc/ssh/sshd_config"
fi
else
echo "# Added via grml-live script:" >> "${target}/etc/ssh/sshd_config"
echo "PermitRootLogin yes" >> "${target}/etc/ssh/sshd_config"
fi

# speedup if DNS is broken/unavailable
if grep -q '^UseDNS ' "${target}/etc/ssh/sshd_config" ; then
# make sure we don't modify our own disabled snippet once again
if ! grep -q 'UseDNS .*disabled via grml-live' "${target}/etc/ssh/sshd_config" ; then
sed -i "s/^\(UseDNS .*\)/# \1 # disabled via grml-live\nUseDNS no/" "${target}/etc/ssh/sshd_config"
fi
else
echo "# Added via grml-live script:" >> "${target}/etc/ssh/sshd_config"
echo "UseDNS no" >> "${target}/etc/ssh/sshd_config"
fi
echo "# Installed by grml-live.
# Ensure root login works. Modern openssh-servers default to prohibit-password.
PermitRootLogin yes
# Speedup if DNS is broken/unavailable.
UseDNS no
" > "${target}"/etc/ssh/sshd_config.d/grml-live.conf

## END OF FILE #################################################################
# vim:ft=sh expandtab ai tw=80 tabstop=4 shiftwidth=2
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