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take care of /etc/ufw/before.rules nat section. safeguard against accidentally killing the file.

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Signed-off-by: corbolais <corbolais@gmail.com>
This commit is contained in:
corbolais 2019-12-08 17:18:08 +01:00
parent 4466f1503c
commit 9c62fe0991
1 changed files with 14 additions and 1 deletions
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13
auto_install/install.sh
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@ -1401,7 +1401,20 @@ confNetwork(){
USING_UFW=1
echo "::: Detected UFW is enabled."
echo "::: Adding UFW rules..."
### Basic safeguard: if file is empty, there's been something weird going on.
### Note: no safeguard against imcomplete content as a result of previous failures.
if test -s /etc/ufw/before.rules; then
$SUDO cp -f /etc/ufw/before.rules /etc/ufw/before.rules.pre-pivpn
else
echo "$0: ERR: Sorry, won't touch empty file \"/etc/ufw/before.rules\".";
exit 1;
fi
### If there is already a "*nat" section just add our POSTROUTING MASQUERADE
if grep -q "*nat" /etc/ufw/before.rules; then
$SUDO sed "/^*nat/{n;s/\(:POSTROUTING ACCEPT .*\)/\1\n-I POSTROUTING -s ${pivpnNET}\/24 -o ${IPv4dev} -j MASQUERADE/}" -i /etc/ufw/before.rules
else
$SUDO sed "/delete these required/i *nat\n:POSTROUTING ACCEPT [0:0]\n-I POSTROUTING -s ${pivpnNET}\/24 -o ${IPv4dev} -j MASQUERADE\nCOMMIT\n" -i /etc/ufw/before.rules
fi
# Insert rules at the beginning of the chain (in case there are other rules that may drop the traffic)
$SUDO ufw insert 1 allow "${pivpnPORT}"/"${pivpnPROTO}" >/dev/null
$SUDO ufw route insert 1 allow in on "${pivpnDEV}" from "${pivpnNET}/24" out on "${IPv4dev}" to any >/dev/null