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Last active July 9, 2022 14:51
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setup.sh
#!/bin/bash -e
echo "=================================================================="
echo "= Updated file with removed 'command' in authorized_keys for root"
echo "=================================================================="
# github.com/jawj/IKEv2-setup
# Copyright (c) 2015 – 2021 George MacKerron
# Released under the MIT licence: http://opensource.org/licenses/mit-license
echo
echo "=== https://github.com/jawj/IKEv2-setup ==="
echo
function exit_badly {
echo "$1"
exit 1
}
[[ $(lsb_release -rs) == "18.04" ]] || [[ $(lsb_release -rs) == "20.04" ]] || exit_badly "This script is for Ubuntu 20.04 or 18.04 only: aborting (if you know what you're doing, try deleting this check)"
[[ $(id -u) -eq 0 ]] || exit_badly "Please re-run as root (e.g. sudo ./path/to/this/script)"
echo "--- Adding repositories and installing utilities ---"
echo
export DEBIAN_FRONTEND=noninteractive
# see https://github.com/jawj/IKEv2-setup/issues/66 and https://bugs.launchpad.net/subiquity/+bug/1783129
# note: software-properties-common is required for add-apt-repository
apt-get -o Acquire::ForceIPv4=true update
apt-get -o Acquire::ForceIPv4=true install -y software-properties-common
add-apt-repository universe
add-apt-repository restricted
add-apt-repository multiverse
apt-get -o Acquire::ForceIPv4=true install -y moreutils dnsutils
echo
echo "--- Configuration: VPN settings ---"
echo
ETH0ORSIMILAR=$(ip route get 1.1.1.1 | grep -oP ' dev \K\S+')
IP=$(dig -4 +short myip.opendns.com @resolver1.opendns.com)
echo "Network interface: ${ETH0ORSIMILAR}"
echo "External IP: ${IP}"
echo
echo "** Note: this hostname must already resolve to this machine, to enable Let's Encrypt certificate setup **"
read -r -p "Hostname for VPN: " VPNHOST
VPNHOSTIP=$(dig -4 +short "${VPNHOST}")
[[ -n "$VPNHOSTIP" ]] || exit_badly "Cannot resolve VPN hostname: aborting"
if [[ "${IP}" != "${VPNHOSTIP}" ]]; then
echo "Warning: ${VPNHOST} resolves to ${VPNHOSTIP}, not ${IP}"
echo "Either you're behind NAT, or something is wrong (e.g. hostname points to wrong IP, CloudFlare proxying shenanigans, ...)"
read -r -p "Press [Return] to continue anyway, or Ctrl-C to abort"
fi
read -r -p "VPN username: " VPNUSERNAME
while true; do
read -r -s -p "VPN password (no quotes, please): " VPNPASSWORD
echo
read -r -s -p "Confirm VPN password: " VPNPASSWORD2
echo
[[ "${VPNPASSWORD}" = "${VPNPASSWORD2}" ]] && break
echo "Passwords didn't match -- please try again"
done
echo '
Public DNS servers include:
176.103.130.130,176.103.130.131 AdGuard https://adguard.com/en/adguard-dns/overview.html
176.103.130.132,176.103.130.134 AdGuard Family https://adguard.com/en/adguard-dns/overview.html
1.1.1.1,1.0.0.1 Cloudflare/APNIC https://1.1.1.1
84.200.69.80,84.200.70.40 DNS.WATCH https://dns.watch
8.8.8.8,8.8.4.4 Google https://developers.google.com/speed/public-dns/
208.67.222.222,208.67.220.220 OpenDNS https://www.opendns.com
208.67.222.123,208.67.220.123 OpenDNS FamilyShield https://www.opendns.com
9.9.9.9,149.112.112.112 Quad9 https://quad9.net
77.88.8.8,77.88.8.1 Yandex https://dns.yandex.com
77.88.8.88,77.88.8.2 Yandex Safe https://dns.yandex.com
77.88.8.7,77.88.8.3 Yandex Family https://dns.yandex.com
'
read -r -p "DNS servers for VPN users (default: 1.1.1.1,1.0.0.1): " VPNDNS
VPNDNS=${VPNDNS:-'1.1.1.1,1.0.0.1'}
echo
echo "--- Configuration: general server settings ---"
echo
read -r -p "Timezone (default: Europe/London): " TZONE
TZONE=${TZONE:-'Europe/London'}
read -r -p "Email address for sysadmin (e.g. [email protected]): " EMAILADDR
read -r -p "Desired SSH log-in port (default: 22): " SSHPORT
SSHPORT=${SSHPORT:-22}
read -r -p "New SSH log-in user name: " LOGINUSERNAME
CERTLOGIN="n"
if [[ -s /root/.ssh/authorized_keys ]]; then
while true; do
read -r -p "Copy /root/.ssh/authorized_keys to new user and disable SSH password log-in [Y/n]? " CERTLOGIN
[[ ${CERTLOGIN,,} =~ ^(y(es)?)?$ ]] && CERTLOGIN=y
[[ ${CERTLOGIN,,} =~ ^no?$ ]] && CERTLOGIN=n
[[ $CERTLOGIN =~ ^(y|n)$ ]] && break
done
fi
while true; do
[[ ${CERTLOGIN} = "y" ]] && read -r -s -p "New SSH user's password (e.g. for sudo): " LOGINPASSWORD
[[ ${CERTLOGIN} != "y" ]] && read -r -s -p "New SSH user's log-in password (must be REALLY STRONG): " LOGINPASSWORD
echo
read -r -s -p "Confirm new SSH user's password: " LOGINPASSWORD2
echo
[[ "${LOGINPASSWORD}" = "${LOGINPASSWORD2}" ]] && break
echo "Passwords didn't match -- please try again"
done
VPNIPPOOL="10.101.0.0/16"
echo
echo "--- Upgrading and installing packages ---"
echo
apt-get -o Acquire::ForceIPv4=true --with-new-pkgs upgrade -y
apt autoremove -y
debconf-set-selections <<< "postfix postfix/mailname string ${VPNHOST}"
debconf-set-selections <<< "postfix postfix/main_mailer_type string 'Internet Site'"
apt-get -o Acquire::ForceIPv4=true install -y language-pack-en strongswan libstrongswan-standard-plugins strongswan-libcharon libcharon-standard-plugins libcharon-extra-plugins iptables-persistent postfix mutt unattended-upgrades certbot uuid-runtime
echo
echo "--- Configuring firewall ---"
echo
# firewall
# https://www.strongswan.org/docs/LinuxKongress2009-strongswan.pdf
# https://wiki.strongswan.org/projects/strongswan/wiki/ForwardingAndSplitTunneling
# https://www.zeitgeist.se/2013/11/26/mtu-woes-in-ipsec-tunnels-how-to-fix/
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -F
iptables -t nat -F
iptables -t mangle -F
# INPUT
# accept anything already accepted
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# accept anything on the loopback interface
iptables -A INPUT -i lo -j ACCEPT
# drop invalid packets
iptables -A INPUT -m state --state INVALID -j DROP
# rate-limit repeated new requests from same IP to any ports
iptables -I INPUT -i "${ETH0ORSIMILAR}" -m state --state NEW -m recent --set
iptables -I INPUT -i "${ETH0ORSIMILAR}" -m state --state NEW -m recent --update --seconds 300 --hitcount 60 -j DROP
# accept (non-standard) SSH
iptables -A INPUT -p tcp --dport "${SSHPORT}" -j ACCEPT
# VPN
# accept IPSec/NAT-T for VPN (ESP not needed with forceencaps, as ESP goes inside UDP)
iptables -A INPUT -p udp --dport 500 -j ACCEPT
iptables -A INPUT -p udp --dport 4500 -j ACCEPT
# forward VPN traffic anywhere
iptables -A FORWARD --match policy --pol ipsec --dir in --proto esp -s "${VPNIPPOOL}" -j ACCEPT
iptables -A FORWARD --match policy --pol ipsec --dir out --proto esp -d "${VPNIPPOOL}" -j ACCEPT
# reduce MTU/MSS values for dumb VPN clients
iptables -t mangle -A FORWARD --match policy --pol ipsec --dir in -s "${VPNIPPOOL}" -o "${ETH0ORSIMILAR}" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1361:1536 -j TCPMSS --set-mss 1360
# masquerade VPN traffic over eth0 etc.
iptables -t nat -A POSTROUTING -s "${VPNIPPOOL}" -o "${ETH0ORSIMILAR}" -m policy --pol ipsec --dir out -j ACCEPT # exempt IPsec traffic from masquerading
iptables -t nat -A POSTROUTING -s "${VPNIPPOOL}" -o "${ETH0ORSIMILAR}" -j MASQUERADE
# fall through to drop any other input and forward traffic
iptables -A INPUT -j DROP
iptables -A FORWARD -j DROP
iptables -L
netfilter-persistent save
echo
echo "--- Configuring RSA certificates ---"
echo
mkdir -p /etc/letsencrypt
echo 'rsa-key-size = 4096
pre-hook = /sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
post-hook = /sbin/iptables -D INPUT -p tcp --dport 80 -j ACCEPT
renew-hook = /usr/sbin/ipsec reload && /usr/sbin/ipsec secrets
' > /etc/letsencrypt/cli.ini
certbot certonly --non-interactive --agree-tos --standalone --preferred-challenges http --email "${EMAILADDR}" -d "${VPNHOST}"
ln -f -s "/etc/letsencrypt/live/${VPNHOST}/cert.pem" /etc/ipsec.d/certs/cert.pem
ln -f -s "/etc/letsencrypt/live/${VPNHOST}/privkey.pem" /etc/ipsec.d/private/privkey.pem
ln -f -s "/etc/letsencrypt/live/${VPNHOST}/chain.pem" /etc/ipsec.d/cacerts/chain.pem
grep -Fq 'jawj/IKEv2-setup' /etc/apparmor.d/local/usr.lib.ipsec.charon || echo "
# https://github.com/jawj/IKEv2-setup
/etc/letsencrypt/archive/${VPNHOST}/* r,
" >> /etc/apparmor.d/local/usr.lib.ipsec.charon
aa-status --enabled && invoke-rc.d apparmor reload
echo
echo "--- Configuring VPN ---"
echo
# ip_forward is for VPN
# ip_no_pmtu_disc is for UDP fragmentation
# others are for security
grep -Fq 'jawj/IKEv2-setup' /etc/sysctl.conf || echo "
# https://github.com/jawj/IKEv2-setup
net.ipv4.ip_forward = 1
net.ipv4.ip_no_pmtu_disc = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.${ETH0ORSIMILAR}.disable_ipv6 = 1
" >> /etc/sysctl.conf
sysctl -p
echo "config setup
strictcrlpolicy=yes
uniqueids=never
conn roadwarrior
auto=add
compress=no
type=tunnel
keyexchange=ikev2
fragmentation=yes
forceencaps=yes
# CNSA/RFC 6379 Suite B (https://wiki.strongswan.org/projects/strongswan/wiki/IKEv2CipherSuites)
ike=aes256gcm16-prfsha384-ecp384!
esp=aes256gcm16-ecp384!
dpdaction=clear
dpddelay=900s
rekey=no
left=%any
leftid=@${VPNHOST}
leftcert=cert.pem
leftsendcert=always
leftsubnet=0.0.0.0/0
right=%any
rightid=%any
rightauth=eap-mschapv2
eap_identity=%any
rightdns=${VPNDNS}
rightsourceip=${VPNIPPOOL}
rightsendcert=never
" > /etc/ipsec.conf
echo "${VPNHOST} : RSA \"privkey.pem\"
${VPNUSERNAME} : EAP \"${VPNPASSWORD}\"
" > /etc/ipsec.secrets
ipsec restart
echo
echo "--- User ---"
echo
# user + SSH
id -u "${LOGINUSERNAME}" &>/dev/null || adduser --disabled-password --gecos "" "${LOGINUSERNAME}"
echo "${LOGINUSERNAME}:${LOGINPASSWORD}" | chpasswd
adduser "${LOGINUSERNAME}" sudo
sed -r \
-e "s/^#?Port 22$/Port ${SSHPORT}/" \
-e 's/^#?LoginGraceTime (120|2m)$/LoginGraceTime 30/' \
-e 's/^#?PermitRootLogin yes$/PermitRootLogin no/' \
-e 's/^#?X11Forwarding yes$/X11Forwarding no/' \
-e 's/^#?UsePAM yes$/UsePAM no/' \
-i.original /etc/ssh/sshd_config
grep -Fq 'jawj/IKEv2-setup' /etc/ssh/sshd_config || echo "
# https://github.com/jawj/IKEv2-setup
MaxStartups 1
MaxAuthTries 2
UseDNS no" >> /etc/ssh/sshd_config
if [[ $CERTLOGIN = "y" ]]; then
mkdir -p "/home/${LOGINUSERNAME}/.ssh"
chown "${LOGINUSERNAME}" "/home/${LOGINUSERNAME}/.ssh"
chmod 700 "/home/${LOGINUSERNAME}/.ssh"
cp "/root/.ssh/authorized_keys" "/home/${LOGINUSERNAME}/.ssh/authorized_keys"
sed -r -i -e 's/command=".*" //' "/home/${LOGINUSERNAME}/.ssh/authorized_keys"
chown "${LOGINUSERNAME}" "/home/${LOGINUSERNAME}/.ssh/authorized_keys"
chmod 600 "/home/${LOGINUSERNAME}/.ssh/authorized_keys"
sed -r \
-e "s/^#?PasswordAuthentication yes$/PasswordAuthentication no/" \
-i.allows_pwd /etc/ssh/sshd_config
fi
service ssh restart
echo
echo "--- Timezone, mail, unattended upgrades ---"
echo
timedatectl set-timezone "${TZONE}"
/usr/sbin/update-locale LANG=en_GB.UTF-8
sed -r \
-e "s/^myhostname =.*$/myhostname = ${VPNHOST}/" \
-e 's/^inet_interfaces =.*$/inet_interfaces = loopback-only/' \
-i.original /etc/postfix/main.cf
grep -Fq 'jawj/IKEv2-setup' /etc/aliases || echo "
# https://github.com/jawj/IKEv2-setup
root: ${EMAILADDR}
${LOGINUSERNAME}: ${EMAILADDR}
" >> /etc/aliases
newaliases
service postfix restart
sed -r \
-e 's|^//Unattended-Upgrade::MinimalSteps "true";$|Unattended-Upgrade::MinimalSteps "true";|' \
-e 's|^//Unattended-Upgrade::Mail "root";$|Unattended-Upgrade::Mail "root";|' \
-e 's|^//Unattended-Upgrade::Automatic-Reboot "false";$|Unattended-Upgrade::Automatic-Reboot "true";|' \
-e 's|^//Unattended-Upgrade::Remove-Unused-Dependencies "false";|Unattended-Upgrade::Remove-Unused-Dependencies "true";|' \
-e 's|^//Unattended-Upgrade::Automatic-Reboot-Time "02:00";$|Unattended-Upgrade::Automatic-Reboot-Time "03:00";|' \
-i /etc/apt/apt.conf.d/50unattended-upgrades
echo 'APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "7";
APT::Periodic::Unattended-Upgrade "1";
' > /etc/apt/apt.conf.d/10periodic
service unattended-upgrades restart
echo
echo "--- Creating configuration files ---"
echo
cd "/home/${LOGINUSERNAME}"
cat << EOF > vpn-ios-or-mac.mobileconfig
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE plist PUBLIC '-//Apple//DTD PLIST 1.0//EN' 'http://www.apple.com/DTDs/PropertyList-1.0.dtd'>
<plist version='1.0'>
<dict>
<key>PayloadContent</key>
<array>
<dict>
<key>IKEv2</key>
<dict>
<key>AuthenticationMethod</key>
<string>None</string>
<key>ChildSecurityAssociationParameters</key>
<dict>
<key>EncryptionAlgorithm</key>
<string>AES-256-GCM</string>
<key>IntegrityAlgorithm</key>
<string>SHA2-384</string>
<key>DiffieHellmanGroup</key>
<integer>20</integer>
<key>LifeTimeInMinutes</key>
<integer>1440</integer>
</dict>
<key>DeadPeerDetectionRate</key>
<string>Medium</string>
<key>DisableMOBIKE</key>
<integer>0</integer>
<key>DisableRedirect</key>
<integer>0</integer>
<key>EnableCertificateRevocationCheck</key>
<integer>0</integer>
<key>EnablePFS</key>
<true/>
<key>ExtendedAuthEnabled</key>
<true/>
<key>IKESecurityAssociationParameters</key>
<dict>
<key>EncryptionAlgorithm</key>
<string>AES-256-GCM</string>
<key>IntegrityAlgorithm</key>
<string>SHA2-384</string>
<key>DiffieHellmanGroup</key>
<integer>20</integer>
<key>LifeTimeInMinutes</key>
<integer>1440</integer>
</dict>
<key>OnDemandEnabled</key>
<integer>1</integer>
<key>OnDemandRules</key>
<array>
<dict>
<key>Action</key>
<string>Connect</string>
</dict>
</array>
<key>RemoteAddress</key>
<string>${VPNHOST}</string>
<key>RemoteIdentifier</key>
<string>${VPNHOST}</string>
<key>UseConfigurationAttributeInternalIPSubnet</key>
<integer>0</integer>
</dict>
<key>IPv4</key>
<dict>
<key>OverridePrimary</key>
<integer>1</integer>
</dict>
<key>PayloadDescription</key>
<string>Configures VPN settings</string>
<key>PayloadDisplayName</key>
<string>VPN</string>
<key>PayloadIdentifier</key>
<string>com.apple.vpn.managed.$(uuidgen)</string>
<key>PayloadType</key>
<string>com.apple.vpn.managed</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
<key>Proxies</key>
<dict>
<key>HTTPEnable</key>
<integer>0</integer>
<key>HTTPSEnable</key>
<integer>0</integer>
</dict>
<key>UserDefinedName</key>
<string>${VPNHOST}</string>
<key>VPNType</key>
<string>IKEv2</string>
</dict>
</array>
<key>PayloadDisplayName</key>
<string>IKEv2 VPN configuration (${VPNHOST})</string>
<key>PayloadIdentifier</key>
<string>com.mackerron.vpn.$(uuidgen)</string>
<key>PayloadRemovalDisallowed</key>
<false/>
<key>PayloadType</key>
<string>Configuration</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
</dict>
</plist>
EOF
grep -Fq 'jawj/IKEv2-setup' /etc/mime.types || echo "
# https://github.com/jawj/IKEv2-setup
application/vnd.strongswan.profile sswan
" >> /etc/mime.types
cat << EOF > vpn-android.sswan
{
"uuid": "$(uuidgen)",
"name": "${VPNHOST}",
"type": "ikev2-eap",
"remote": {
"addr": "${VPNHOST}"
}
}
EOF
cat << EOF > vpn-ubuntu-client.sh
#!/bin/bash -e
if [[ \$(id -u) -ne 0 ]]; then echo "Please run as root (e.g. sudo ./path/to/this/script)"; exit 1; fi
read -p "VPN username (same as entered on server): " VPNUSERNAME
while true; do
read -s -p "VPN password (same as entered on server): " VPNPASSWORD
echo
read -s -p "Confirm VPN password: " VPNPASSWORD2
echo
[ "\$VPNPASSWORD" = "\$VPNPASSWORD2" ] && break
echo "Passwords didn't match -- please try again"
done
apt-get install -y strongswan libstrongswan-standard-plugins libcharon-extra-plugins
apt-get install -y libcharon-standard-plugins || true # 17.04+ only
ln -f -s /etc/ssl/certs/ISRG_Root_X1.pem /etc/ipsec.d/cacerts/
grep -Fq 'jawj/IKEv2-setup' /etc/ipsec.conf || echo "
# https://github.com/jawj/IKEv2-setup
conn ikev2vpn
ikelifetime=60m
keylife=20m
rekeymargin=3m
keyingtries=1
keyexchange=ikev2
ike=aes256gcm16-prfsha384-ecp384!
esp=aes256gcm16-ecp384!
leftsourceip=%config
leftauth=eap-mschapv2
eap_identity=\${VPNUSERNAME}
right=${VPNHOST}
rightauth=pubkey
rightid=@${VPNHOST}
rightsubnet=0.0.0.0/0
auto=add # or auto=start to bring up automatically
" >> /etc/ipsec.conf
grep -Fq 'jawj/IKEv2-setup' /etc/ipsec.secrets || echo "
# https://github.com/jawj/IKEv2-setup
\${VPNUSERNAME} : EAP \"\${VPNPASSWORD}\"
" >> /etc/ipsec.secrets
ipsec restart
sleep 5 # is there a better way?
echo "Bringing up VPN ..."
ipsec up ikev2vpn
ipsec statusall
echo
echo -n "Testing IP address ... "
VPNIP=\$(dig -4 +short ${VPNHOST})
ACTUALIP=\$(dig -4 +short myip.opendns.com @resolver1.opendns.com)
if [[ "\$VPNIP" == "\$ACTUALIP" ]]; then echo "PASSED (IP: \${VPNIP})"; else echo "FAILED (IP: \${ACTUALIP}, VPN IP: \${VPNIP})"; fi
echo
echo "To disconnect: ipsec down ikev2vpn"
echo "To reconnect: ipsec up ikev2vpn"
echo "To connect automatically: change auto=add to auto=start in /etc/ipsec.conf"
EOF
cat << EOF > vpn-instructions.txt
== iOS and macOS ==
A configuration profile is attached as vpn-ios-or-mac.mobileconfig — simply open this to install. You will be asked for your device PIN or password, and your VPN username and password, not necessarily in that order.
== Windows ==
You will need Windows 10 Pro or above. Please run the following commands in PowerShell:
$Response = Invoke-WebRequest -UseBasicParsing -Uri https://valid-isrgrootx1.letsencrypt.org
# ^ this line fixes a certificate lazy-loading bug: see https://github.com/jawj/IKEv2-setup/issues/126
Add-VpnConnection -Name "${VPNHOST}" \`
-ServerAddress "${VPNHOST}" \`
-TunnelType IKEv2 \`
-EncryptionLevel Maximum \`
-AuthenticationMethod EAP \`
-RememberCredential
Set-VpnConnectionIPsecConfiguration -ConnectionName "${VPNHOST}" \`
-AuthenticationTransformConstants GCMAES256 \`
-CipherTransformConstants GCMAES256 \`
-EncryptionMethod GCMAES256 \`
-IntegrityCheckMethod SHA384 \`
-DHGroup ECP384 \`
-PfsGroup ECP384 \`
-Force
# Run the following command to retain access to the local network (e.g. printers, file servers) while the VPN is connected.
# On a home network, you probably want this. On a public network, you probably don't.
Set-VpnConnection -Name "${VPNHOST}" -SplitTunneling \$True
You will need to enter your chosen VPN username and password in order to connect.
== Android ==
Download the strongSwan app from the Play Store: https://play.google.com/store/apps/details?id=org.strongswan.android
Then open the attached .sswan file, or select it after choosing 'Import VPN profile' from the strongSwan app menu. You will need to enter your chosen VPN username and password in order to connect.
For a persistent connection, go to your device's Settings app and choose Network & Internet > Advanced > VPN > strongSwan VPN Client, tap the gear icon and toggle on 'Always-on VPN' (these options may differ by Android version and provider).
== Ubuntu ==
A bash script to set up strongSwan as a VPN client is attached as vpn-ubuntu-client.sh. You will need to chmod +x and then run the script as root.
EOF
EMAIL=$USER@$VPNHOST mutt -s "VPN configuration" -a vpn-ios-or-mac.mobileconfig vpn-android.sswan vpn-ubuntu-client.sh -- "${EMAILADDR}" < vpn-instructions.txt
echo
echo "--- How to connect ---"
echo
echo "Connection instructions have been emailed to you, and can also be found in your home directory, /home/${LOGINUSERNAME}"
# necessary for IKEv2?
# Windows: https://support.microsoft.com/en-us/kb/926179
# HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent += AssumeUDPEncapsulationContextOnSendRule, DWORD = 2
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