Free valid SSL certificate for local development with Let’s Encrypt

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Meetup #2 : le chiffrement - https://tinyurl.com/y5mg6s2q May 23, 2019 Mickael PALMA @ L’Argus

Free valid SSL certiﬁcate
For local development with Let’s Encrypt
Meetup #2 : le chiﬀrement - May 23, 2019 - Mickael PALMA @ L’Argus

whoami
• Mickael PALMA 
mpalma@largus.fr

• Argus API CTO

• LinkedIn

Let’s Encrypt
• non-profit certificate authority 
Internet Security Research Group

• Free X.509 certificates for TLS

• Easy SSL configuration

• Valid certificates for 90 days

• Automatic certificate renewal

Issued certiﬁcates
Inmillionissued
0
90
180
270
360
450
March8,2016
April21,2016
June3,2016
June22,2016
September9,2016
November27,2016
December12,2016
June28,2017
August6,2018
September14,2018
380
115
100
2420105421

ACME Protocol
• HTTP-01 challenge

• DNS-01 challenge

• TLS-SNI-01 challenge 
Disabled in March 2019

• TLS-ALPN-01 challenge

• API v2 
March 13, 2018

• incompatible with v1

• single domains - HTTP / DNS 
example.com, www.example.com

• wildcard domains - DNS 
*.example.com
Let’s Encrypt API
• API v1 
April 12, 2016

• single domains - HTTP / DNS 
example.com, www.example.com

• DEPRECATED

Certbot
• Let’s Encrypt “oﬃcial” client 
Python

• Most extensive client 
HTTP → HTTPS redirects 
OCSP stapling 
HSTS 
upgrade-insecure-requests

DEMO
File samples on Gist

Recipe
• Register a domain name (domain.me)

• Use Cloudflare as name server

• Point wildcards (*) to 127.0.0.1

• Get certificate with certbot 
With Cloudflare plugin and DNS-01 challenge

• Configure your web server with it

Resources
• Let's Encrypt oﬃcial website

• ACME challenges types

• Certbot / Github 
Alternative acme.sh

• TLS-SNI-01 vulnerability
discovery story

• Gist

Mickael PALMA
“MERCI”

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Free valid SSL certificate for local development with Let’s Encrypt

1. Free valid SSL certiﬁcate For local development with Let’s Encrypt Meetup #2 : le chiﬀrement - May 23, 2019 - Mickael PALMA @ L’Argus

2. whoami • Mickael PALMA  mpalma@largus.fr • Argus API CTO • LinkedIn

3. Let’s Encrypt • non-profit certificate authority  Internet Security Research Group • Free X.509 certificates for TLS • Easy SSL configuration • Valid certificates for 90 days • Automatic certificate renewal

4. Issued certiﬁcates Inmillionissued 0 90 180 270 360 450 March8,2016 April21,2016 June3,2016 June22,2016 September9,2016 November27,2016 December12,2016 June28,2017 August6,2018 September14,2018 380 115 100 2420105421

5. ACME Protocol • HTTP-01 challenge • DNS-01 challenge • TLS-SNI-01 challenge  Disabled in March 2019 • TLS-ALPN-01 challenge

6. • API v2  March 13, 2018 • incompatible with v1 • single domains - HTTP / DNS  example.com, www.example.com • wildcard domains - DNS  *.example.com Let’s Encrypt API • API v1  April 12, 2016 • single domains - HTTP / DNS  example.com, www.example.com • DEPRECATED

7. Certbot • Let’s Encrypt “oﬃcial” client  Python • Most extensive client  HTTP → HTTPS redirects  OCSP stapling  HSTS  upgrade-insecure-requests

8. DEMO File samples on Gist

9. Recipe • Register a domain name (domain.me) • Use Cloudflare as name server • Point wildcards (*) to 127.0.0.1 • Get certificate with certbot  With Cloudflare plugin and DNS-01 challenge • Configure your web server with it

10. Resources • Let's Encrypt oﬃcial website • ACME challenges types • Certbot / Github  Alternative acme.sh • TLS-SNI-01 vulnerability discovery story • Gist

11. Mickael PALMA “MERCI”