St Louis Linux Users Group Wireguard (for Fun and Networking)

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This document discusses different VPN protocols and presents Wireguard as a new option. It provides an overview of older protocols like PPTP and OpenVPN, noting their security weaknesses. The document then introduces Wireguard as very fast with low overhead, using standardized encryption algorithms and having no known major vulnerabilities. It demonstrates how to install and set up Wireguard on different platforms like the Raspberry Pi, Ubuntu, MacOS, and Android to securely connect networks.

Wireguard
For Fun and Networking
Andrew Denner
Saint Louis Linux Users Group
October 22, 2020

About our Presenter
Andrew Denner
• http://denner.co
• twitter: @adenner
• Senior Software Developer
• Linux Tinkerer
2

It’s replacement also failed. (High quality woot)
6

PPTP
• Stands for ”Point-to-Point Tunneling Protocol”
• Introduced in 1995 and was improvement on PPP
• Initially Windows implementation
• Basic TCP based tunnel on port 1723
• Most compatible and simple but not very secure
• NSA likely cracked PPTP traffic
• MS-CHAP V1 & 2 are cracked (authentication)
• MPPE uses RC4 Stream Cipher
17

IPSec IKEv2
• Part of IPSec Protocol RFC7296
• Uses fixed ports so easier to block
• Can use large Suite of crypto algorithms (3DES, AES,
Blowfish, Camellia et.al.)
• No known major vulnerabilities but rumors of NSA
exploit
• in theory faster than OpenVpn
• implementation OpenSwan
18

OpenVPN
• Developed by OpenVPN technologies but not RFC
Standard
• Uses OpenSSL library for encryption & supports 3DES
AES RC5 blowfish et.al. Using SSL/TLS for Key exchange
• No known major vulnerabilities
• Easy to use and configurable can run any port and
UDP TCP
• Not included in any OS but easy to install
19

Wireguard
• Very fast with low overhead using Standardized sauce
• Standardized Encryption
• ChaCha20 for symmetric encryption (RFC7539)
• Curve25519 for ECDH
• Blake2 hashing (RFC 7693)
• SipHash24 hashtable keys
• HKDF key derivation (RFC5869)
• UDP based handshake & key exchange with
perfect forward secrecy protects against
impersonation and replay attacks
20

Wireguard (cont.)
• No known major vulnerabilities but is new has been
3rd party audited
• Uses UDP and configurable to any port but may suffer
from traffic shaping more easily
• In tree support in Kernel 5.6 but other OS require
installation of Client App.
21

They even have a 20 page TEXwhitepaper...
27

Demo 0: Install Wireguard on Rasbery Pi
33

Install Wireguard on Rasbery Pi (cont)
• see https://wireguard.how/server/raspbian/
34

Demo 1: Install Wireguard on Ubuntu
20.04
35

References
• Comparison of VPN Protocols https:
//www.ivpn.net/pptp-vs-ipsec-ikev2-vs-openvpn-vs-wireguard
• NSA Crack of PPTP: https://hacker10.com/internet-anonymity/
secret-documents-show-the-nsa-is-spying-on-vpn-users/
• NSA IPSEC: https://www.forbes.com/sites/thomasbrewster/2016/
08/19/cisco-nsa-vpn-hack-shadow-brokers-leak/
• Set Up Wireguard https://www.linode.com/docs/networking/vpn/
set-up-wireguard-vpn-on-ubuntu/
38

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