Openconnect VPN Nikos Mavrogiannopoulos Security Technologies Red - - PowerPoint PPT Presentation

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Openconnect VPN Nikos Mavrogiannopoulos Security Technologies Red - - PowerPoint PPT Presentation

Feb 08, 2023 328 likes •740 views

Openconnect VPN Nikos Mavrogiannopoulos Security Technologies Red Hat February, 2016 VPN story The server Future plans VPN story 3/17/13 3 Red Hat VPN story T ask Setup a VPN service to inter-connect router devices

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Openconnect VPN

Nikos Mavrogiannopoulos Security Technologies Red Hat February, 2016

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  • VPN story
  • The server
  • Future plans
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3/17/13 3 Red Hat

VPN story

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3/17/13 4 Red Hat

VPN story

  • T

ask

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Setup a VPN service to inter-connect router devices

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3/17/13 5 Red Hat

VPN story

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3/17/13 6 Red Hat

VPN story

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3/17/13 7 Red Hat

VPN story

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3/17/13 8 Red Hat

VPN story

  • Requirements:

–

Simple setup for users

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3/17/13 9 Red Hat

VPN story

  • Requirements:

–

Standards based solution

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3/17/13 10 Red Hat

VPN story

  • Requirements:

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The administrator should be able to view who is connected on every moment

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3/17/13 11 Red Hat

VPN story

  • Requirements:

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The administrator should be able to disconnect and block access to users

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3/17/13 12 Red Hat

VPN story

  • Solution:

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Based on OpenVPN and lots of custom scripts

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3/17/13 13 Red Hat

VPN story

  • Solution:

–

Based on OpenVPN and lots of custom scripts

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3/17/13 14 Red Hat

VPN story

  • Requirements:

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Simple setup for users

–

Standards based solution

–

The administrator should be able to view who is connected on every moment

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The administrator should be able to disconnect and block access to users

Involved configuration files for client setup, TCP/UDP had to be selected by user

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3/17/13 15 Red Hat

VPN story

  • Requirements:

–

Simple setup for users

–

Standards based solution

–

The administrator should be able to view who is connected on every moment

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The administrator should be able to disconnect and block access to users

Was using TLS for key exchange; everything else was custom

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3/17/13 16 Red Hat

VPN story

  • Requirements:

–

Simple setup for users

–

Standards based solution

–

The administrator should be able to view who is connected on every moment

–

The administrator should be able to disconnect and block access to users

No support; lots

  • f custom scripts
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3/17/13 17 Red Hat

VPN story

  • Requirements:

–

Simple setup for users

–

Standards based solution

–

The administrator should be able to view who is connected on every moment

–

The administrator should be able to disconnect and block access to users

No support

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3/17/13 18 Red Hat

VPN story

  • AnyConnect VPN
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3/17/13 20 Red Hat

VPN story

  • CISCO AnyConnect VPN

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A proprietary VPN implementation based on standard protocols

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A VPN channel established over an HTTPS session (TLS 1.x)

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Supports dual TCP/UDP; UDP via a pre-draft DTLS version

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Open-source compatible client → openconnect

  • Implements a compatible protocol we call “Openconnect protocol”
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3/17/13 21 Red Hat

VPN story

  • CISCO AnyConnect VPN

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A proprietary VPN implementation based on standard protocols

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A VPN channel established over an HTTPS session (TLS 1.x)

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Supports dual TCP/UDP; UDP via a pre-draft DTLS version

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Open-source compatible client → openconnect

  • Implements a compatible protocol we call “Openconnect protocol”

Standards compliant VPN

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3/17/13 22 Red Hat

History

  • OpenConnect doesn't need any user confjguration

# openconnect server.example.com:443

POST https://server.example.com/ Attempting to connect to server 127.0.0.1:443 SSL negotiation with server.example.com Connected to HTTPS on server.example.com XML POST enabled Please enter your username Username:test POST https://server.example.com/auth Please enter your password. Password: POST https://server.example.com/auth Got CONNECT response: HTTP/1.1 200 CONNECTED CSTP connected. DPD 90, Keepalive 32400 Connected tun0 as 192.168.1.191, using SSL Established DTLS connection (using GnuTLS). Ciphersuite (DTLS1.2)-(RSA)-(AES-128-GCM).

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3/17/13 23 Red Hat

History

  • OpenConnect doesn't need any user confjguration

# openconnect server.example.com:443

POST https://server.example.com/ Attempting to connect to server 127.0.0.1:443 SSL negotiation with server.example.com Connected to HTTPS on server.example.com XML POST enabled Please enter your username Username:test POST https://server.example.com/auth Please enter your password. Password: POST https://server.example.com/auth Got CONNECT response: HTTP/1.1 200 CONNECTED CSTP connected. DPD 90, Keepalive 32400 Connected tun0 as 192.168.1.191, using SSL Established DTLS connection (using GnuTLS). Ciphersuite (DTLS1.2)-(RSA)-(AES-128-GCM).

Simple user setup

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3/17/13 24 Red Hat

VPN story

  • Requirements:

–

Simple setup for users

–

Standards based solution

–

The administrator should be able to view who is connected on every moment

–

The administrator should be able to disconnect and block access to users

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3/17/13 25 Red Hat

VPN story

  • Requirements:

–

Simple setup for users

–

Standards based solution

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The administrator should be able to view who is connected on every moment

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The administrator should be able to disconnect and block access to users

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The server should isolate users between them

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The server should operate under the least possible privilege

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3/17/13 26 Red Hat

The server

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3/17/13 27 Red Hat

The server

  • Openconnect server: started in 2013
  • T
  • day the server interoperates with both openconnect and Anyconnect clients

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Is available for Linux and *BSD systems

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3/17/13 28 Red Hat

The server

  • Features:

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Supports for password (fjle, PAM, radius), certifjcate or Kerberos authentication

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Supports setting resource limits per client or groups of clients (e.g., cgroups, bandwidth)

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Processing scales with the number of CPUs

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Supports LZS, LZ4 compression

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Supports TLS 1.2, DTLS 1.2 and AES-GCM

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Supports online user management

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3/17/13 29 Red Hat

The server

  • Features:

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Privilege separation between main server and worker processes

  • Isolation of worker processes (using seccomp)

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Isolated software security module handles PAM/radius and keys

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3/17/13 30 Red Hat

The server

  • Features:

–

Privilege separation between main server and worker processes

  • Isolation of worker processes (using seccomp)

–

Isolated software security module handles PAM/radius and keys

User isolation + Least privilege

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3/17/13 31 Red Hat

The server

  • occtl: Control tool to administer the server and view clients
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3/17/13 32 Red Hat

The server

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3/17/13 33 Red Hat

The server

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3/17/13 34 Red Hat

The server

User overview

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3/17/13 35 Red Hat

The server

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3/17/13 36 Red Hat

The server

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3/17/13 37 Red Hat

The server

User disconnect/block

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3/17/13 38 Red Hat

VPN story

  • Requirements:

–

Simple setup for users

–

Standards based solution

–

The administrator should be able to view who is connected on every moment

–

The administrator should be able to disconnect and block access to users

–

The server should isolate users between them

–

The server should operate under the least possible privilege

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3/17/13 39 Red Hat

Future plans

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3/17/13 40 Red Hat

Future plans

  • Extend and simplify the openconnect protocol

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e.g., drop legacy pre-DTLS 1.0 support

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Publish and standardize on an SSL/VPN protocol

  • Improve performance by utilizing an in-kernel TLS/DTLS stack
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3/17/13 41 Red Hat

Questions

  • www.infradead.org/openconnect
  • www.infradead.org/ocserv
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