From 727a80d387c2cdd395e77e5bfcd1fbf04bf34e3f Mon Sep 17 00:00:00 2001 From: Ian Kelling Date: Sun, 14 Aug 2016 12:02:49 -0700 Subject: [PATCH 1/1] working, tested version --- LICENSE | 202 +++++++++++++++++++++++++++++++++++++++++++++ README | 7 ++ vpn-mk-client-cert | 68 +++++++++++++++ vpn-server-setup | 101 +++++++++++++++++++++++ 4 files changed, 378 insertions(+) create mode 100644 LICENSE create mode 100644 README create mode 100755 vpn-mk-client-cert create mode 100755 vpn-server-setup diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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Assumes server was setup +# by the other script in this dir. + +set -eE -o pipefail +trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR + +[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@" + +usage() { + cat <<'EOF' +usage: ${0##*/} VPN_SERVER_HOST [CLIENT_HOST] + +Generate a client cert and config and install it on locally or on +CLIENT_HOST if given. Uses default config options, and expects be able +to ssh to VPN_SERVER_HOST and CLIENT_HOST. +EOF + exit ${1:-0} +} + +case $1 in + -h|--help|*) usage 0 ;; +esac + +(($# <= 2)) || usage 1 + +host=$1 +shell="bash -c" +if [[ $2 ]]; then + shell="ssh $2" +fi + +# bash or else we get motd spam. note sleep 2, sleep 1 failed. +ssh $host bash </dev/null + +# uuidgen because common name must be unique +{ echo -e '\n\n\n\n\n'\$(uuidgen)'\n\n\n\n\n'; sleep 2; echo -e 'y\ny\n'; } | ./build-key client &>/dev/null + +d=\$(mktemp -d) +cp /etc/openvpn/easy-rsa/keys/ca.crt \ + /etc/openvpn/update-resolv-conf \ + /usr/share/doc/openvpn/examples/sample-config-files/client.conf \$d +mv /etc/openvpn/easy-rsa/keys/client.{crt,key} \$d + +sed -i --follow-symlinks "s/^remote .*/remote $host 1194/" \$d/client.conf + +tar cz -C \$d . +rm -rf \$d +EOF diff --git a/vpn-server-setup b/vpn-server-setup new file mode 100755 index 0000000..5c21d4e --- /dev/null +++ b/vpn-server-setup @@ -0,0 +1,101 @@ +#!/bin/bash +# Copyright (C) 2016 Ian Kelling + +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at + +# http://www.apache.org/licenses/LICENSE-2.0 + +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + + +set -eE -o pipefail +trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR + +[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@" + +case $1 in + -h|--help|*) + cat <<'EOF' +usage: ${0##*/} + +Sets up a vpn server which pushes gateway route and dns server +so all traffic goes through the vpn. requires systemd, +and might have some debian specific paths. +EOF + ;; +esac + + +apt-get update +# suggests get's us openssl & easy rsa +apt-get install --install-suggests -y openvpn +apt-get install -y uuid-runtime +mkdir -p /etc/openvpn/easy-rsa/keys +cd /etc/openvpn/easy-rsa +cp -r /usr/share/easy-rsa/* . +source vars # dun care about setting cert cn etc from the non-example values +./clean-all +# accept default prompts +echo -e '\n\n\n\n\n\n\n\n' | ./build-ca + +# This builds the server's key/cert. argument is the name of the file, +# but it also is the default common name of the cert. +# 'server' is the default name in our conf file for the name of the file +# and I've seen no reason to change it. +# Note, this is not idempotent. +{ echo -e '\n\n\n\n\n\n\n\n\n\n'; sleep 1; echo -e 'y\ny\n'; } | ./build-key-server server +./build-dh +cp /usr/share/doc/openvpn/examples/sample-config-files/server.conf.gz /etc/openvpn/ +cp /etc/openvpn/easy-rsa/keys/{ca.crt,server.{crt,key},dh2048.pem} /etc/openvpn +gzip -df /etc/openvpn/server.conf.gz +sed -i --follow-symlinks 's/^dh dh1024.pem/dh dh2048.pem/' /etc/openvpn/server.conf + +teeu() { + while read -r line; do + grep -xFq "$line" "$1" || echo "$line" | tee -a "$1" + done +} + +# Be the default gateway for clients. +teeu /etc/openvpn/server.conf <<'EOF' +push "redirect-gateway def1" +EOF + +# Be the dns server for clients +teeu /etc/openvpn/server.conf <<'EOF' +push "dhcp-option DNS 10.8.0.1" +EOF + +echo "1" > /proc/sys/net/ipv4/ip_forward +sed -i --follow-symlinks '/^ *net\.ipv4\.ip_forward=.*/d' /etc/sysctl.conf +teeu /etc/sysctl.conf <<'EOF' +net.ipv4.ip_forward=1 +EOF + + +gw=$(ip route | sed -rn 's/^default via .* dev (\S+).*/\1/p') + +sudo dd of=/etc/systemd/system/mynat.service <