Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
SSL, CAs and keeping your stuff safe
Search
Armin Ronacher
May 10, 2014
Programming
7
1k
SSL, CAs and keeping your stuff safe
A capitalistic and system conformant talk about encryption.
Armin Ronacher
May 10, 2014
Tweet
Share
More Decks by Armin Ronacher
See All by Armin Ronacher
The Catch in Rye: Seeding Change and Lessons Learned
mitsuhiko
0
170
Runtime Objects in Rust
mitsuhiko
0
310
Rust at Sentry
mitsuhiko
0
330
Overcoming Variable Payloads to Optimize for Performance
mitsuhiko
0
140
Rust API Design Learnings
mitsuhiko
0
450
The Snowball Effect of Open Source
mitsuhiko
0
300
Mobile Games are Living Organisms, Too
mitsuhiko
0
200
We gave a Mouse an NDK
mitsuhiko
0
770
Debug is the new Release
mitsuhiko
1
570
Other Decks in Programming
See All in Programming
subpath importsで始めるモック生活
10tera
0
300
.NET のための通信フレームワーク MagicOnion 入門 / Introduction to MagicOnion
mayuki
1
1.4k
Webの技術スタックで マルチプラットフォームアプリ開発を可能にするElixirDesktopの紹介
thehaigo
2
1k
AI時代におけるSRE、 あるいはエンジニアの生存戦略
pyama86
6
1.1k
ピラミッド、アイスクリームコーン、SMURF: 自動テストの最適バランスを求めて / Pyramid Ice-Cream-Cone and SMURF
twada
PRO
10
1.3k
シェーダーで魅せるMapLibreの動的ラスタータイル
satoshi7190
1
480
Laravel や Symfony で手っ取り早く OpenAPI のドキュメントを作成する
azuki
1
110
TypeScript Graph でコードレビューの心理的障壁を乗り越える
ysk8hori
2
1.1k
Amazon Qを使ってIaCを触ろう!
maruto
0
400
Ethereum_.pdf
nekomatu
0
460
RubyLSPのマルチバイト文字対応
notfounds
0
120
Outline View in SwiftUI
1024jp
1
320
Featured
See All Featured
How to Ace a Technical Interview
jacobian
276
23k
Scaling GitHub
holman
458
140k
jQuery: Nuts, Bolts and Bling
dougneiner
61
7.5k
A Modern Web Designer's Workflow
chriscoyier
693
190k
The Cult of Friendly URLs
andyhume
78
6k
A Philosophy of Restraint
colly
203
16k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
27
840
Mobile First: as difficult as doing things right
swwweet
222
8.9k
The Art of Programming - Codeland 2020
erikaheidi
52
13k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
6
410
Visualization
eitanlees
145
15k
Keith and Marios Guide to Fast Websites
keithpitt
409
22k
Transcript
SSL, CAs and keeping your stuff safe BQSFTFOUBUJPOCZBSNJOSPOBDIFSGPSQZHSVOO http://lucumr.pocoo.org/ —
@mitsuhiko
SSL, CAs and keeping your stuff safe BQSFTFOUBUJPOCZBSNJOSPOBDIFSGPSQZHSVOO http://lucumr.pocoo.org/ —
@mitsuhiko a capitalistic and system conformant talk about encryption
Armin Ronacher Independent Contractor for Splash Damage / Fireteam Doing
Online Infrastructure for Computer Games
… The Problem with Programmers ~ Epilogue ~
Programmers think everything is a technical problem
Fraud ~ Chapter 1 ~
XXXX-XXXX-XXXX-1234 What is the worst that can happen?
What makes Credit Card Numbers “secure”?
theft ere will always be criminals
prevented But what damage can they do?
Bitcoin A Credit Card Strong Encryption Potentially No Encryption 256
bit private key 16 digit number + checksum decentralized centralized √ x
But I'd rather lose my credit card …
Never
LOL
We Accept Stolen Creditcards
e Protocol e Process is insecure is secure
If the aud percentage is smaller than the transaction fees
we're all good.
It's too easy to forget the bigger picture
of Lock Symbols and Encryption ~ Chapter 2 ~
the lock symbol is a lie
the lock stands for secure
but so is encryption 8 7
such security
such buzzwords CRIME BEAST Heartbleed BREACH PFS
users need to understand how to keep good om bad
lock symbols / good om bad encryption. = -
but even developers are not sure yet …
remember why you encrypt (NSA
Why do we Encrypt Traffic? ~ Chapter 3 ~
None
public WiFi the unencrypted browser session kilLed
? Who is the Attacker?
om secret agents to idiots
om targeted to untargeted
om low to high probability
What You Need for Encryption ~ Chapter 4 ~
passive vs active eavesdropping encryption authentication
$ ssh pocoo.org The authenticity of host 'pocoo.org (148.251.50.164)' can't
be established. RSA key fingerprint is 14:23:83:02:45:f9:9c:d0:eb:39:c7:14:42:f5:9f:9c. Are you sure you want to continue connecting (yes/no)?
your user does not check ngerprints (your
e Certificate Authorities thus:
CAs are worthless for securing APIs let it be known
that
Protecting APIs and Services ~ Chapter 5 ~ (non
The Only Rule to Follow
run your own CA issue certi cates for 24 hours
trust your own CA only screw re ocations
You trust your own CA by distributing the certi cate
to everybody.
If your root gets compromised, distribute new root certi cates.
If an individual key gets compromised, in less than 24
hours everything is ne.
from requests import get resp = get('https://api.yourserver.com/', verify='your/certificate.bundle')
“But my awesome AntiVirus says your certi cate is not
trusted.” — Windows User
Certificate Authorities Again ~ Chapter 6 ~
Hardly news: CAs are Broken
But why are the broken?
I Trust “TÜRKTRUST Elektronik Serti ka Hizmet Sağlayıcısı” to ouch
for the identity of any domain on the planet. Trusting a CA:
trusting half the world: one shitty employee in one shitty
CA is enough to break your security.
I Trust “Comodo” to ouch for the identity of “Foo
Owner” foo.com. I only trust “Foo Owner” to ouch for the identity of api.foo.com What we actually want:
if you have seen google.com being from Verisign and all
the sudden google.com becomes a StartSSL certificate you know something might be wrong.
Soon: Certificate Pinning?
Frack OpenSSL and Question “Best Practices” ~ Chapter 7 ~
Self-Signed Certificates are not bad. Just in browsers.
Never. Ever. Look at OpenSSL's Source.
OpenSSL's "patches" are even worse: Apple's OpenSSL always trusts system
store :-/
Requests by default trusts it's own bundle :-/ (And does
not even properly document how to use custom ones)
With Heartbleed SSL was less secure than no SSL :-/
Growing SSL ~ Chapter 8 ~
Credit Cards were made for thousands of people Certificate Authorities
were made for hundreds of sites
OpenSSL was probably improperly audited
See “OpenSSL Valhalla Rampage” :-( “i give up. reuse problem
is unixable. dlg says puppet crashes” — tedu
Plan for Failure ~ Chapter 9 ~
what
what happens to your user if he gets hacked? (food
for thought: keyloggers are still a thing)
what happens to your data
what happens to your company
encryption is hardened security it must not be your only
defense
? Feel Free To Ask Questions Talk slides will be
online on lucumr.pocoo.org/talks You can find me on Twitter: @mitsuhiko And gittip: gittip.com/mitsuhiko Or hire me:
[email protected]