Merge remote-tracking branch 'origin/openvpn'

tools/install_openvpn.sh

@@ -0,0 +1,154 @@
+#!/bin/bash
+# install_openvpn.sh - Install OpenVPN and generate required certificates
+#
+# install_openvpn.sh --client name
+# install_openvpn.sh --server [name]
+#
+# name is used on the CN of the generated cert, and the filename of
+# the configuration, certificate and key files.
+#
+# --server mode configures the host with a running OpenVPN server instance
+# --client mode creates a tarball of a client configuration for this server
+
+# VPN Config
+VPN_SERVER=${VPN_SERVER:-`ifconfig eth0 | awk "/inet addr:/ { print \$2 }" | cut -d: -f2`}  # 50.56.12.212
+VPN_PROTO=${VPN_PROTO:-tcp}
+VPN_PORT=${VPN_PORT:-6081}
+VPN_DEV=${VPN_DEV:-tun}
+VPN_CLIENT_NET=${VPN_CLIENT_NET:-172.16.28.0}
+VPN_CLIENT_MASK=${VPN_CLIENT_MASK:-255.255.255.0}
+VPN_LOCAL_NET=${VPN_LOCAL_NET:-10.0.0.0}
+VPN_LOCAL_MASK=${VPN_LOCAL_MASK:-255.255.0.0}
+
+VPN_DIR=/etc/openvpn
+CA_DIR=/etc/openvpn/easy-rsa
+
+usage() {
+    echo "$0 - OpenVPN install and certificate generation"
+    echo ""
+    echo "$0 --client name"
+    echo "$0 --server [name]"
+    echo ""
+    echo " --server mode configures the host with a running OpenVPN server instance"
+    echo " --client mode creates a tarball of a client configuration for this server"
+    exit 1
+}
+
+if [ -z $1 ]; then
+    usage
+fi
+
+# Install OpenVPN
+if [ ! -x `which openvpn` ]; then
+    apt-get install -y openvpn bridge-utils
+fi
+if [ ! -d $CA_DIR ]; then
+    cp -pR /usr/share/doc/openvpn/examples/easy-rsa/2.0/ $CA_DIR
+fi
+
+OPWD=`pwd`
+cd $CA_DIR
+source ./vars
+
+# Override the defaults
+export KEY_COUNTRY="US"
+export KEY_PROVINCE="TX"
+export KEY_CITY="SanAntonio"
+export KEY_ORG="Cloudbuilders"
+export KEY_EMAIL="rcb@lists.rackspace.com"
+
+if [ ! -r $CA_DIR/keys/dh1024.pem ]; then
+    # Initialize a new CA
+    $CA_DIR/clean-all
+    $CA_DIR/build-dh
+    $CA_DIR/pkitool --initca
+    openvpn --genkey --secret $CA_DIR/keys/ta.key  ## Build a TLS key
+fi
+
+do_server() {
+    NAME=$1
+    # Generate server certificate
+    $CA_DIR/pkitool --server $NAME
+
+    (cd $CA_DIR/keys;
+        cp $NAME.crt $NAME.key ca.crt dh1024.pem ta.key $VPN_DIR
+    )
+    cat >$VPN_DIR/$NAME.conf <<EOF
+proto $VPN_PROTO
+port $VPN_PORT
+dev $VPN_DEV
+cert $NAME.crt
+key $NAME.key  # This file should be kept secret
+ca ca.crt
+dh dh1024.pem
+duplicate-cn
+server $VPN_CLIENT_NET $VPN_CLIENT_MASK
+ifconfig-pool-persist ipp.txt
+push "route $VPN_LOCAL_NET $VPN_LOCAL_MASK"
+comp-lzo
+user nobody
+group nobody
+persist-key
+persist-tun
+status openvpn-status.log
+EOF
+    /etc/init.d/openvpn restart
+}
+
+do_client() {
+    NAME=$1
+    # Generate a client certificate
+    $CA_DIR/pkitool $NAME
+
+    TMP_DIR=`mktemp -d`
+    (cd $CA_DIR/keys;
+        cp -p ca.crt ta.key $NAME.key $NAME.crt $TMP_DIR
+    )
+    if [ -r $VPN_DIR/hostname ]; then
+        HOST=`cat $VPN_DIR/hostname`
+    else
+        HOST=`hostname`
+    fi
+    cat >$TMP_DIR/$HOST.conf <<EOF
+proto $VPN_PROTO
+port $VPN_PORT
+dev $VPN_DEV
+cert $NAME.crt
+key $NAME.key  # This file should be kept secret
+ca ca.crt
+client
+remote $VPN_SERVER $VPN_PORT
+resolv-retry infinite
+nobind
+user nobody
+group nobody
+persist-key
+persist-tun
+comp-lzo
+verb 3
+EOF
+    (cd $TMP_DIR; tar cf $OPWD/$NAME.tar *)
+    rm -rf $TMP_DIR
+    echo "Client certificate and configuration is in $OPWD/$NAME.tar"
+}
+
+# Process command line args
+case $1 in
+    --client)   if [ -z $2 ]; then
+                    usage
+                fi
+                do_client $2
+                ;;
+    --server)   if [ -z $2 ]; then
+                    NAME=`hostname`
+                else
+                    NAME=$2
+                    # Save for --client use
+                    echo $NAME >$VPN_DIR/hostname
+                fi
+                do_server $NAME
+                ;;
+    --clean)    $CA_DIR/clean-all
+                ;;
+    *)          usage
+esac