257 lines
9.0 KiB
Bash
257 lines
9.0 KiB
Bash
#!/bin/sh
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exitOnError(){
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# $1 must be set to $?
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status=$1
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message=$2
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[ "$message" != "" ] || message="Error!"
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if [ $status != 0 ]; then
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printf "$message (status $status)\n"
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exit $status
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fi
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}
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exitIfUnset(){
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# $1 is the name of the variable to check - not the variable itself
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var="$(eval echo "\$$1")"
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if [ -z "$var" ]; then
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printf "Environment variable $1 is not set\n"
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exit 1
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fi
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}
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exitIfNotIn(){
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# $1 is the name of the variable to check - not the variable itself
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# $2 is a string of comma separated possible values
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var="$(eval echo "\$$1")"
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for value in ${2//,/ }
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do
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if [ "$var" = "$value" ]; then
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return 0
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fi
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done
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printf "Environment variable $1=$var must be one of the following: "
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for value in ${2//,/ }
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do
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printf "$value "
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done
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printf "\n"
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exit 1
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}
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printf " =========================================\n"
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printf " =========================================\n"
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printf " ============= PIA CONTAINER =============\n"
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printf " =========================================\n"
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printf " =========================================\n"
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printf " == by github.com/qdm12 - Quentin McGaw ==\n\n"
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printf "OpenVPN version: $(openvpn --version | head -n 1 | grep -oE "OpenVPN [0-9\.]* " | cut -d" " -f2)\n"
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printf "Unbound version: $(unbound -h | grep "Version" | cut -d" " -f2)\n"
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printf "Iptables version: $(iptables --version | cut -d" " -f2)\n"
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############################################
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# CHECK PARAMETERS
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############################################
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exitIfUnset USER
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exitIfUnset PASSWORD
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exitIfNotIn ENCRYPTION "normal,strong"
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exitIfNotIn PROTOCOL "tcp,udp"
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exitIfNotIn BLOCK_MALICIOUS "on,off"
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cat "/openvpn/$PROTOCOL-$ENCRYPTION/$REGION.ovpn" &> /dev/null
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exitOnError $? "/openvpn/$PROTOCOL-$ENCRYPTION/$REGION.ovpn is not accessible"
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for SUBNET in ${EXTRA_SUBNETS//,/ }; do
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if [ $(echo "$SUBNET" | grep -Eo '^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(/([0-2]?[0-9])|([3]?[0-1]))?$') = "" ]; then
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printf "Subnet $SUBNET is not a valid IPv4 subnet of the form 255.255.255.255/31 or 255.255.255.255\n"
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exit 1
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fi
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done
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#####################################################
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# Writes to protected file and remove USER, PASSWORD
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#####################################################
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if [ -f /auth.conf ]; then
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printf "/auth.conf already exists\n"
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else
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printf "Writing USER and PASSWORD to protected file /auth.conf..."
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echo "$USER" > /auth.conf
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exitOnError $?
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echo "$PASSWORD" >> /auth.conf
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exitOnError $?
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chown nonrootuser /auth.conf
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exitOnError $?
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chmod 400 /auth.conf
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exitOnError $?
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printf "DONE\n"
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printf "Clearing environment variables USER and PASSWORD..."
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unset -v USER
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unset -v PASSWORD
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printf "DONE\n"
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fi
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############################################
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# CHECK FOR TUN DEVICE
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############################################
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while [ "$(cat /dev/net/tun 2>&1 /dev/null)" != "cat: read error: File descriptor in bad state" ]; do
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printf "TUN device is not available, sleeping for 30 seconds...\n"
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sleep 30
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done
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printf "TUN device OK\n"
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############################################
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# BLOCKING MALICIOUS HOSTNAMES AND IPs WITH UNBOUND
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############################################
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printf "Malicious hostnames and ips blocking is $BLOCK_MALICIOUS\n"
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rm -f /etc/unbound/blocks-malicious.conf
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if [ "$BLOCK_MALICIOUS" = "on" ]; then
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tar -xjf /etc/unbound/blocks-malicious.bz2 -C /etc/unbound/
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printf "$(cat /etc/unbound/blocks-malicious.conf | grep "local-zone" | wc -l ) malicious hostnames and $(cat /etc/unbound/blocks-malicious.conf | grep "private-address" | wc -l) malicious IP addresses blacklisted\n"
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else
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echo "" > /etc/unbound/blocks-malicious.conf
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fi
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############################################
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# SETTING DNS OVER TLS TO 1.1.1.1 / 1.0.0.1
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############################################
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printf "Launching Unbound daemon to connect to Cloudflare DNS 1.1.1.1 at its TLS endpoint..."
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unbound
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exitOnError $?
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printf "DONE\n"
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printf "Changing DNS to localhost..."
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echo "nameserver 127.0.0.1" > /etc/resolv.conf
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exitOnError $?
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echo "options ndots:0" >> /etc/resolv.conf
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exitOnError $?
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printf "DONE\n"
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############################################
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# Reading chosen OpenVPN configuration
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############################################
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printf "Reading configuration for region $REGION, protocol $PROTOCOL and encryption $ENCRYPTION...\n"
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CONNECTIONSTRING=$(grep -i "/openvpn/$PROTOCOL-$ENCRYPTION/$REGION.ovpn" -e 'privateinternetaccess.com')
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exitOnError $?
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PORT=$(echo $CONNECTIONSTRING | cut -d' ' -f3)
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if [ "$PORT" = "" ]; then
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printf "Port not found in /openvpn/$PROTOCOL-$ENCRYPTION/$REGION.ovpn\n"
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exit 1
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fi
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PIADOMAIN=$(echo $CONNECTIONSTRING | cut -d' ' -f2)
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if [ "$PIADOMAIN" = "" ]; then
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printf "Domain not found in /openvpn/$PROTOCOL-$ENCRYPTION/$REGION.ovpn\n"
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exit 1
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fi
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printf " * Port: $PORT\n"
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printf " * Domain: $PIADOMAIN\n"
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printf "Detecting IP addresses corresponding to $PIADOMAIN...\n"
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VPNIPS=$(nslookup $PIADOMAIN localhost | tail -n +5 | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}')
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exitOnError $?
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for ip in $VPNIPS; do
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printf " $ip\n";
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done
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############################################
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# Writing target OpenVPN files
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############################################
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TARGET_PATH="/openvpn/target"
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printf "Creating target OpenVPN files in $TARGET_PATH..."
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rm -rf $TARGET_PATH/*
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cd "/openvpn/$PROTOCOL-$ENCRYPTION"
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cp -f *.crt "$TARGET_PATH"
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exitOnError $? "Cannot copy crt file to $TARGET_PATH"
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cp -f *.pem "$TARGET_PATH"
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exitOnError $? "Cannot copy pem file to $TARGET_PATH"
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cp -f "$REGION.ovpn" "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot copy $REGION.ovpn file to $TARGET_PATH"
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sed -i "/$CONNECTIONSTRING/d" "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot delete '$CONNECTIONSTRING' from $TARGET_PATH/config.ovpn"
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sed -i '/resolv-retry/d' "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot delete 'resolv-retry' from $TARGET_PATH/config.ovpn"
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for ip in $VPNIPS; do
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echo "remote $ip $PORT" >> "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot add 'remote $ip $PORT' to $TARGET_PATH/config.ovpn"
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done
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# Uses the username/password from this file to get the token from PIA
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echo "auth-user-pass /auth.conf" >> "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot add 'auth-user-pass /auth.conf' to $TARGET_PATH/config.ovpn"
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# Reconnects automatically on failure
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echo "auth-retry nointeract" >> "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot add 'auth-retry nointeract' to $TARGET_PATH/config.ovpn"
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# Prevents auth_failed infinite loops - make it interact? Remove persist-tun? nobind?
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echo "pull-filter ignore \"auth-token\"" >> "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot add 'pull-filter ignore \"auth-token\"' to $TARGET_PATH/config.ovpn"
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# Runs openvpn without root, as nonrootuser
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echo "user nonrootuser" >> "$TARGET_PATH/config.ovpn"
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exitOnError $? "Cannot add 'user nonrootuser' to $TARGET_PATH/config.ovpn"
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# Note: TUN device re-opening will restart the container due to permissions
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printf "DONE\n"
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############################################
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# FIREWALL
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############################################
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printf "Setting firewall for killswitch purposes...\n"
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printf " * Detecting local subnet..."
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SUBNET=$(ip route show default | tail -n 1 | cut -d" " -f 1)
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exitOnError $?
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printf "$SUBNET\n"
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printf " * Deleting all iptables rules..."
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iptables --flush
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exitOnError $?
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iptables --delete-chain
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exitOnError $?
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iptables -t nat --flush
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exitOnError $?
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iptables -t nat --delete-chain
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exitOnError $?
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printf "DONE\n"
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printf " * Block output traffic..."
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iptables -F OUTPUT
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exitOnError $?
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iptables -P OUTPUT DROP
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exitOnError $?
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printf "DONE\n"
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printf " * Accept established and related output traffic..."
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iptables -A OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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exitOnError $?
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printf "DONE\n"
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printf " * Accept local loopback output traffic..."
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iptables -A OUTPUT -o lo -j ACCEPT
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exitOnError $?
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printf "DONE\n"
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printf " * Accept output traffic with local subnet $SUBNET..."
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iptables -A OUTPUT -d $SUBNET -j ACCEPT
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exitOnError $?
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printf "DONE\n"
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for EXTRASUBNET in ${EXTRA_SUBNETS//,/ }
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do
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printf " * Accept output traffic with extra subnet $EXTRASUBNET..."
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iptables -A OUTPUT -d $EXTRASUBNET -j ACCEPT
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exitOnError $?
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printf "DONE\n"
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done
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for ip in $VPNIPS; do
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printf " * Accept output traffic to $ip on interface eth0, port $PROTOCOL $PORT..."
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iptables -A OUTPUT -j ACCEPT -d $ip -o eth0 -p $PROTOCOL -m $PROTOCOL --dport $PORT
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exitOnError $?
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printf "DONE\n"
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done
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printf " * Accept all output traffic on tun0 interface..."
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iptables -A OUTPUT -o tun0 -j ACCEPT
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exitOnError $?
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printf "DONE\n"
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############################################
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# OPENVPN LAUNCH
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############################################
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printf "Starting OpenVPN using the following parameters:\n"
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printf " * Region: $REGION\n"
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printf " * Encryption: $ENCRYPTION\n"
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printf " * Protocol: $PROTOCOL\n"
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printf " * Port: $PORT\n"
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printf " * Initial VPN IP address: $(echo "$VPNIPS" | head -n 1)\n\n"
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cd "$TARGET_PATH"
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openvpn --config config.ovpn
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status=$?
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printf "\n =========================================\n"
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printf " OpenVPN exit with status $status\n"
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printf " =========================================\n\n"
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