fragattacks/hs20/server/hs20-osu-server.txt

Hotspot 2.0 OSU server
======================

The information in this document is based on the assumption that Ubuntu
16.04 server (64-bit) distribution is used and the web server is
Apache2. Neither of these are requirements for the installation, but if
other combinations are used, the package names and configuration
parameters may need to be adjusted.

NOTE: This implementation and the example configuration here is meant
only for testing purposes in a lab environment. This design is not
secure to be installed in a publicly available Internet server without
considerable amount of modification and review for security issues.


Build dependencies
------------------

Ubuntu 16.04 server
- default installation
- upgraded to latest package versions
  sudo apt-get update
  sudo apt-get upgrade

Packages needed for running the service:
  sudo apt-get install sqlite3
  sudo apt-get install apache2
  sudo apt-get install php-sqlite3 php-xml libapache2-mod-php

Additional packages needed for building the components:
  sudo apt-get install build-essential
  sudo apt-get install libsqlite3-dev
  sudo apt-get install libssl-dev
  sudo apt-get install libxml2-dev


Installation location
---------------------

Select a location for the installation root directory. The example here
assumes /home/user/hs20-server to be used, but this can be changed by
editing couple of files as indicated below.

sudo mkdir -p /home/user/hs20-server
sudo chown $USER /home/user/hs20-server
mkdir -p /home/user/hs20-server/spp
mkdir -p /home/user/hs20-server/AS


Build
-----

# hostapd as RADIUS server
cd hostapd

#example build configuration
cat > .config <<EOF
CONFIG_DRIVER_NONE=y
CONFIG_PKCS12=y
CONFIG_RADIUS_SERVER=y
CONFIG_EAP=y
CONFIG_EAP_TLS=y
CONFIG_EAP_MSCHAPV2=y
CONFIG_EAP_PEAP=y
CONFIG_EAP_GTC=y
CONFIG_EAP_TTLS=y
CONFIG_EAP_SIM=y
CONFIG_EAP_AKA=y
CONFIG_EAP_AKA_PRIME=y
CONFIG_SQLITE=y
CONFIG_HS20=y
EOF

make hostapd hlr_auc_gw
cp hostapd hlr_auc_gw /home/user/hs20-server/AS

# build hs20_spp_server
cd ../hs20/server
make clean
make
cp hs20_spp_server /home/user/hs20-server/spp
# prepare database (web server user/group needs to have write access)
mkdir -p /home/user/hs20-server/AS/DB
sudo chgrp www-data /home/user/hs20-server/AS/DB
sudo chmod g+w /home/user/hs20-server/AS/DB
sqlite3 /home/user/hs20-server/AS/DB/eap_user.db < sql.txt
sudo chgrp www-data /home/user/hs20-server/AS/DB/eap_user.db
sudo chmod g+w /home/user/hs20-server/AS/DB/eap_user.db
# add example configuration (note: need to update URLs to match the system)
sqlite3 /home/user/hs20-server/AS/DB/eap_user.db < sql-example.txt

# copy PHP scripts
# Modify config.php if different installation directory is used.
# Modify PHP scripts to get the desired behavior for user interaction (or use
# the examples as-is for initial testing).
cp -r www /home/user/hs20-server

# Create /home/user/hs20-server/terms-and-conditions file (HTML segment to be
# inserted within the BODY section of the page).
cat > /home/user/hs20-server/terms-and-conditions <<EOF
<P>Terms and conditions..</P>
EOF

# Build local keys and certs
cd ca
# Display help options.
./setup.sh -h

# Remove old keys, fill in appropriate values, and generate your keys.
# For instance:
./clean.sh
rm -fr rootCA"
old_hostname=myserver.local
./setup.sh -C "Hotspot 2.0 Trust Root CA - CT" \
   -o $old_hostname-osu-client \
   -O $old_hostname-oscp -p lanforge -S $old_hostname \
   -V $old_hostname-osu-revoked \
   -m local -u http://$old_hostname:8888/

# Configure subscription policies
mkdir -p /home/user/hs20-server/spp/policy
cat > /home/user/hs20-server/spp/policy/default.xml <<EOF
<Policy>
	<PolicyUpdate>
		<UpdateInterval>30</UpdateInterval>
		<UpdateMethod>ClientInitiated</UpdateMethod>
		<Restriction>Unrestricted</Restriction>
		<URI>https://policy-server.osu.example.com/hs20/spp.php</URI>
	</PolicyUpdate>
</Policy>
EOF


# Install Hotspot 2.0 SPP and OMA DM XML schema/DTD files

# XML schema for SPP
# Copy the latest XML schema into /home/user/hs20-server/spp/spp.xsd

# OMA DM Device Description Framework DTD
# Copy into /home/user/hs20-server/spp/dm_ddf-v1_2.dtd
# http://www.openmobilealliance.org/tech/DTD/dm_ddf-v1_2.dtd


# Configure RADIUS authentication service
# Note: Change the URL to match the setup
# Note: Install AAA server key/certificate and root CA in Key directory

cat > /home/user/hs20-server/AS/as-sql.conf <<EOF
driver=none
radius_server_clients=as.radius_clients
eap_server=1
eap_user_file=sqlite:DB/eap_user.db
ca_cert=Key/ca.pem
server_cert=Key/server.pem
private_key=Key/server.key
private_key_passwd=passphrase
eap_sim_db=unix:/tmp/hlr_auc_gw.sock db=eap_sim.db
subscr_remediation_url=https://subscription-server.osu.example.com/hs20/spp.php
EOF

# Set RADIUS passphrase for the APs
# Note: Modify to match the setup
cat > /home/user/hs20-server/AS/as.radius_clients <<EOF
0.0.0.0/0	radius
EOF


Start RADIUS authentication server
----------------------------------

cd /home/user/hs20-server/AS
./hostapd -B as-sql.conf


OSEN RADIUS server configuration notes

The OSEN RADIUS server config file should have the 'ocsp_stapling_response'
configuration in it. For example:

# hostapd-radius config for the radius used by the OSEN AP
interface=eth0#0
driver=none
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
eap_server=1
eap_user_file=/home/user/hs20-server/AS/hostapd-osen.eap_user
server_id=ben-ota-2-osen
radius_server_auth_port=1811
radius_server_clients=/home/user/hs20-server/AS/hostap.radius_clients

ca_cert=/home/user/hs20-server/ca/ca.pem
server_cert=/home/user/hs20-server/ca/server.pem
private_key=/home/user/hs20-server/ca/server.key
private_key_passwd=whatever

ocsp_stapling_response=/home/user/hs20-server/ca/ocsp-server-cache.der

The /home/user/hs20-server/AS/hostapd-osen.eap_user file should look
similar to this, and should coorelate with the osu_nai entry in
the non-OSEN VAP config file.  For instance:

# cat hostapd-osen.eap_user
# For OSEN authentication (Hotspot 2.0 Release 2)
"osen@w1.fi"      WFA-UNAUTH-TLS


# Run OCSP server:
cd /home/user/hs20-server/ca
./ocsp-responder.sh&

# Update cache (This should be run periodically)
./ocsp-update-cache.sh


Configure web server
--------------------

Edit /etc/apache2/sites-available/default-ssl

Add following block just before "SSL Engine Switch" line":

        Alias /hs20/ "/home/user/hs20-server/www/"
        <Directory "/home/user/hs20-server/www/">
                Options Indexes MultiViews FollowSymLinks
                AllowOverride None
		Require all granted
		SSLOptions +StdEnvVars
        </Directory>

Update SSL configuration to use the OSU server certificate/key.
They keys and certs are called 'server.key' and 'server.pem' from
ca/setup.sh.

To support subscription remediation using client certificates, set
"SSLVerifyClient optional" and configure the trust root CA(s) for the
client certificates with SSLCACertificateFile.

Enable default-ssl site and restart Apache2:
  sudo a2ensite default-ssl
  sudo a2enmod ssl
  sudo service apache2 restart


Management UI
-------------

The sample PHP scripts include a management UI for testing
purposes. That is available at https://<server>/hs20/users.php


AP configuration
----------------

APs can now be configured to use the OSU server as the RADIUS
authentication server. In addition, the OSU Provider List ANQP element
should be configured to use the SPP (SOAP+XML) option and with the
following Server URL:
https://<server>/hs20/spp.php/signup?realm=example.com