Universal Second Factor authentication

or why 2FA today is

wubalubadubdub

Yuriy Ackermann

Sr. Certification Engineer @FIDOAlliance

twitter/github: @herrjemand

Today we will learn

  • Why passwords not enough
  • Why 2FA has not succeeded
  • Introduction to U2F
  • DEMO
  • Q&A

Why not just passwords?

Weak

Phishing

Reuse

Typical passwords life cycle

SOLUTION!

Two Factor Authentication - aka 2FA

pwned

haveibeenpwned.com

What is 2FA?

Passwords verify

2FA authenticate

Do you use 2FA?

What does 2FA looks like?

Three main types

Apps

Tokens

SMS

(TOTP and HOTP)

(PKI and OTP)

So we solved it?

Right?

Why 2FA has not succeeded?

Apps

Tokens

SMS

  • Phishing!!
  • UX
  • Shared key
  • Synced time
  • Cost
  • DRIVERS
  • Phishing
  • UX
  • Centralised
  • Fragile
  • Still phishable
  • UX
  • Privacy
  • Security
    • SIM reissue
    • SIM spoof
  • Coverage
  • NIST Ban

Current state of 2FA

I am in the deep pain,

please help!

So how do we solve it?

We need:

  • Easy to use

  • Open

  • Secure

  • Standardized

protocol.

Introducing

Universal Second Factor

aka FIDO U2F

How does U2F works?

User layer

Browser layer

Protocol Layer

Step one: Challenge-Response

Step two: Phishing protection

Step three: Application-specific key-pair

Relying
Party

To Wrap, or not to Wrap?

Step four: Replay Attack Protection

Step five: Device attestation

Metadata service

Step five and a half: Key exercise protection

User must confirm their decision to perform 2FA, by performing user gesture

e.g.

Fingerprint

Retina scan

Pincode

Remembering your wife's birthday.

Solving Rubikscube

...anything you want.

Pressing button

Multiple identifiers

Web

Android

iOS

How do we deal with it?

mail.google.com

apk-key-hash:FD18FA

com.google.SecurityKey.dogfood

GMail

Application Facets

{
  "trustedFacets": [{
    "version": { "major": 1, "minor" : 0 },
    "ids": [
      "https://accounts.google.com",
      "https://myaccount.google.com",
      "https://security.google.com",

      "android:apk-key-hash:FD18FA800DD00C0D9D7724328B6D...",
      "android:apk-key-hash:/Rj6gA3QDA2ddyQyi21JXly6gw9D...",

      "ios:bundle-id:com.google.SecurityKey.dogfood"
    ]
  }]
}

MUST be served over VALID HTTPS!

...no self signed certs.

Implementations

Current users

dongleauth.info

Browser support

Yes

Yes*

(Nightly)

No*

(Soon...)

Maybe?

Yes

WebAuthN

A W3C standard for PublicKey credential authentication

https://www.w3.org/Webauthn/

Today we learned

  • Passwords are hard
  • 2FA is wubalubadubdub, and we need to do something about it.
  • FIDO U2F is sweet.
    • ​Protocol is cute
    • You can have multiple identities
    • There are existing solutions...
    • ...and people do use it

DEMO

  • You must use HTTPS
  • Start using TLS Channel ID's
  • U2F is just 2FA. Don't use as primary factor.

Security considerations

  • https://github.com/Yubico/pam-u2f
  • https://github.com/Yubico/python-u2flib-server
  • https://github.com/Yubico/python-u2flib-host
  • https://github.com/herrjemand/flask-fido-u2f
  • https://github.com/gavinwahl/django-u2f
  • https://github.com/google/u2f-ref-code
  • https://github.com/conorpp/u2f-zero
  • https://developers.yubico.com/U2F/
  • https://fidoalliance.org/specifications/download/
  • https://github.com/LedgerHQ  <-  JavaCard
  • FIDO Dev (fido-dev) mailing list

Specs and data

Things to play with

What's next?

WE NEED

Questions?

twitter/github: @herrjemand

Quick thanks to

Feitian and Yubico

for swag!

Thank you  OWASP!

Universal Second Factor authentication, or why 2FA today is wubalubadubdub? - OWASP LONDON FEB 2018

By FIDO Alliance

Universal Second Factor authentication, or why 2FA today is wubalubadubdub? - OWASP LONDON FEB 2018

OWASP London presentation on FIDO Universal Second Factor Authentication.

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