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codename_duchess

USB tether android to pi3 wireless AP and tunnel traffic through VPN

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I'm not sure if this is the right place for this, but I'm going to ask anyway and hope for some direction.

I've been trying to find a way to use my unlocked/rooted moto g osprey on metro pcs as a USB modem for my pi3 that is acting as a wireless AP.  I started with these two guides:

https://www.novaspirit.com/2017/06/22/raspberry-pi-vpn-router-w-pia/  

and

https://pimylifeup.com/raspberry-pi-wireless-access-point/

 

They didn't work.  So I did some digging and modified a few of the steps to this:

# Add usb0 to /etc/network/interfaces
	sudo nano /etc/network/interfaces
	# Add
		allow-hotplug usb0
		iface usb0 inet dhcp

# Install openvpn
	sudo apt-get install openvpn

# Using PIA 
	wget https://www.privateinternetaccess.com/openvpn/openvpn.zip
	unzip openvpn.zip -d openvpn
# Copy certs
	sudo cp openvpn/ca.rsa.2048.crt openvpn/crl.rsa.2048.pem /etc/openvpn/
	sudo cp openvpn/US New York.ovpn /etc/openvpn/US.conf
# Create login file
	sudo nano /etc/openvpn/login
		username
		password
# Point config to right location
	sudo nano /etc/openvpn/US.conf
	# Change:
		auth-user-pass
		to
		auth-user-pass /etc/openvpn/login
	# Change:
		ca ca.rsa.2048.crt
		to
		ca /etc/openvpn/ca.rsa.2048.crt
	# Change:
		crl-verify crl.rsa.2048.pem
		to
		crl-verify /etc/openvpn/crl.rsa.2048.pem

# Reboot
	sudo reboot

# Test VPN
	sudo openvpn --config /etc/openvpn/US.conf
	# Ctrl+C to exit
# Enable at boot
	sudo systemctl enable openvpn@US
# Enable forwarading
	sudo nano /etc/sysctl.conf
	# Uncomment
		net.ipv4.ip_forward=1
# Enable service
	sudo sysctl -p
# Edit IPTables rules(paste commands into command line)
	sudo iptables -A INPUT -i lo -m comment --comment "loopback" -j ACCEPT
	sudo iptables -A OUTPUT -o lo -m comment --comment "loopback" -j ACCEPT
	sudo iptables -I INPUT -i usb0 -m comment --comment "In from LAN" -j ACCEPT
	sudo iptables -I OUTPUT -o tun+ -m comment --comment "Out to VPN" -j ACCEPT
	sudo iptables -A OUTPUT -o usb0 -p udp --dport 1198 -m comment --comment "openvpn" -j ACCEPT
	sudo iptables -A OUTPUT -o usb0 -p udp --dport 123 -m comment --comment "ntp" -j ACCEPT
	sudo iptables -A OUTPUT -p UDP --dport 67:68 -m comment --comment "dhcp" -j ACCEPT
	sudo iptables -A OUTPUT -o usb0 -p udp --dport 53 -m comment --comment "dns" -j ACCEPT
	sudo iptables -A FORWARD -i tun+ -o usb0 -m state --state RELATED,ESTABLISHED -j ACCEPT
	sudo iptables -A FORWARD -i usb0 -o tun+ -m comment --comment "LAN out to VPN" -j ACCEPT
	sudo iptables -t nat -A POSTROUTING -o tun+ -j MASQUERADE
# Make IPTables rules persistent
	sudo apt-gt install iptables-persistent
		# Answer yes to both questions
# Apply everything to startup
	sudo systemctl enable netfilter-persistent
# Install packages to turn pi3 into hotspot
	sudo apt-get install hostapd
	sudo apt-get install dnsmasq
# Stop anything else from using wlan0
	sudo nano /etc/dhcpcd.conf
	#Add to bottom of file, but above any other interfaces in file
		denyinterfaces wlan0
# Configure static ip
	sudo nano /etc/network/interfaces
	#Change wlan0 entry to:
		allow-hotplug wlan0  
		iface wlan0 inet static  
		    address 192.168.220.1
		    netmask 255.255.255.0
		    network 192.168.220.0
		    broadcast 192.168.220.255
		#    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
# Restart dhcpd 
	sudo service dhcpcd restart
	sudo ifdown wlan0; sudo ifup wlan0
# Configure hostapd(ssid and wpa_passphrase can be whatever you want)
	sudo nano /etc/hostapd/hostapd.conf
		interface=wlan0
		driver=nl80211

		hw_mode=g
		channel=6
		ieee80211n=1
		wmm_enabled=1
		ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]
		macaddr_acl=0
		ignore_broadcast_ssid=0

		# Use WPA2
		auth_algs=1
		wpa=2
		wpa_key_mgmt=WPA-PSK
		rsn_pairwise=CCMP

		# This is the name of the network
		ssid=Pi3-AP
		# The network passphrase
		wpa_passphrase=raspberry
# Tell hostapd where to find config
	sudo nano /etc/default/hostapd
	# Change
		#DAEMON_CONF=""
		to
		DAEMON_CONF="/etc/hostapd/hostapd.conf"
# Again tell hostapd where to find config
	sudo nano /etc/init.d/hostapd
	# Change
		DAEMON_CONF=
		to
		DAEMON_CONF=/etc/hostapd/hostapd.conf
# Backup dnsmasq.conf
	sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig
# Create new dnsmasq.conf
	sudo nano /etc/dnsmasq.conf
	# Add
		interface=wlan0       # Use interface wlan0  
		listen-address=192.168.220.1   # Specify the address to listen on  
		bind-interfaces      # Bind to the interface
		server=8.8.8.8       # Use Google DNS  
		domain-needed        # Don't forward short names  
		-priv           # Drop the non-routed address spaces.  
		dhcp-range=192.168.220.50,192.168.220.150,12h # IP range and lease time  
# Activate forwarding
	sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"
# More IPTables rules(paste into command line)
	sudo iptables -t nat -A POSTROUTING -o usb0 -j MASQUERADE  
	sudo iptables -A FORWARD -i usb0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT  
	sudo iptables -A FORWARD -i wlan0 -o usb0 -j ACCEPT
# Save new rules
	sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"
# Load rules at boot
	sudo nano /etc/rc/local
	# Find "exit 0" at bottom of file and above that line add
		iptables-restore < /etc/iptables.ipv4.nat
# Start services
	sudo service hostapd start
	sudo service dnsmasq start
# Reboot 
	sudo reboot

It still doesn't work.  I end up not being able to load the page or getting redirected to a metropcs.com page telling me that my plan doesn't support tethering.  I have everything working using my phone as a wifi hotspot, firing up openvpn connect, and then using vpn tether from the google playstore, but my DNS leaks and I end up going through tmobile DNS servers rather than my VPNs.  The phone as a hotspot does what I need it to, but I've spent so much time trying to get the pi to do what I want that I don't want to give up.

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