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Check VPN subnets

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- Check for custom VPN subnet(s) in the uninstall script. This is for
  the uncommon cases where VPN subnet(s) were customized during setup.
This commit is contained in:
hwdsl2 2022-03-12 17:08:00 -06:00
parent f129077b63
commit d2321d76af
1 changed files with 26 additions and 5 deletions
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31
extras/vpnuninstall.sh
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@ -23,6 +23,11 @@ exiterr() { echo "Error: $1" >&2; exit 1; }
conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
bigecho() { echo "## $1"; }
check_cidr() {
CIDR_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(/(3[0-2]|[1-2][0-9]|[0-9]))$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$CIDR_REGEX"
}
check_root() {
if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo bash $0'"
@ -196,6 +201,21 @@ update_rclocal() {
fi
}
get_vpn_subnets() {
L2TP_NET=192.168.42.0/24
XAUTH_NET=192.168.43.0/24
if [ -s /etc/ipsec.conf ]; then
if ! grep -q "$L2TP_NET" /etc/ipsec.conf \
|| ! grep -q "$XAUTH_NET" /etc/ipsec.conf; then
vipr=$(grep "virtual-private=" /etc/ipsec.conf)
l2tpnet=$(printf '%s' "$vipr" | cut -f2 -d '!' | sed 's/,%v4://')
xauthnet=$(printf '%s' "$vipr" | cut -f3 -d '!')
check_cidr "$l2tpnet" && L2TP_NET="$l2tpnet"
check_cidr "$xauthnet" && XAUTH_NET="$xauthnet"
fi
fi
}
update_iptables_rules() {
use_nft=0
if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ] \
@ -221,6 +241,7 @@ update_iptables_rules() {
if [ "$ipt_flag" = "1" ]; then
if [ "$use_nft" = "0" ]; then
bigecho "Updating IPTables rules..."
get_vpn_subnets
iptables-save > "$IPT_FILE.old-$SYS_DT"
$ipi -p udp --dport 1701 -m policy --dir in --pol none -j DROP
$ipi -m conntrack --ctstate INVALID -j DROP
@ -232,12 +253,12 @@ update_iptables_rules() {
$ipf -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate "$res" -j ACCEPT
$ipf -i ppp+ -o "$NET_IFACE" -j ACCEPT
$ipf -i ppp+ -o ppp+ -j ACCEPT
$ipf -i "$NET_IFACE" -d 192.168.43.0/24 -m conntrack --ctstate "$res" -j ACCEPT
$ipf -s 192.168.43.0/24 -o "$NET_IFACE" -j ACCEPT
$ipf -s 192.168.43.0/24 -o ppp+ -j ACCEPT
$ipf -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate "$res" -j ACCEPT
$ipf -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
$ipf -s "$XAUTH_NET" -o ppp+ -j ACCEPT
iptables -D FORWARD -j DROP
$ipp -s 192.168.43.0/24 -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
$ipp -s 192.168.42.0/24 -o "$NET_IFACE" -j MASQUERADE
$ipp -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
$ipp -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE
iptables-save > "$IPT_FILE"
if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then