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-rw-r--r--2018-cryptofest/makefile10
-rw-r--r--2018-cryptofest/package.svg485
-rw-r--r--2018-cryptofest/pres.pdfbin0 -> 99984 bytes
-rw-r--r--2018-cryptofest/pres.tex182
-rw-r--r--2018-cryptofest/turris-logo.svg46
5 files changed, 723 insertions, 0 deletions
diff --git a/2018-cryptofest/makefile b/2018-cryptofest/makefile
new file mode 100644
index 0000000..9ab8f60
--- /dev/null
+++ b/2018-cryptofest/makefile
@@ -0,0 +1,10 @@
+FILE=pres
+
+$(FILE).pdf: $(FILE).tex $(patsubst %.svg,%.pdf,$(wildcard *.svg))
+ pdflatex -shell-escape $<
+
+%.pdf: %.svg
+ inkscape -D -z --file=$< --export-pdf=$@ --export-latex
+
+clean:
+ ls | grep -v -E "($(FILE).tex|makefile|scheme|svg|png|eps)$$" | xargs rm -rf
diff --git a/2018-cryptofest/package.svg b/2018-cryptofest/package.svg
new file mode 100644
index 0000000..47beed7
--- /dev/null
+++ b/2018-cryptofest/package.svg
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diff --git a/2018-cryptofest/pres.pdf b/2018-cryptofest/pres.pdf
new file mode 100644
index 0000000..0b08ec3
--- /dev/null
+++ b/2018-cryptofest/pres.pdf
Binary files differ
diff --git a/2018-cryptofest/pres.tex b/2018-cryptofest/pres.tex
new file mode 100644
index 0000000..8a9b8f6
--- /dev/null
+++ b/2018-cryptofest/pres.tex
@@ -0,0 +1,182 @@
+\documentclass[aspectratio=169]{beamer}
+\usetheme{metropolis}
+\usepackage{lmodern}
+\usepackage[czech]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{graphicx}
+\usepackage{wrapfig}
+\usepackage{color}
+\usepackage{mathtools}
+\usepackage{hyperref}
+\usepackage{epstopdf}
+\usepackage{amsmath}
+\hypersetup{
+ colorlinks,
+ citecolor=black,
+ filecolor=black,
+ linkcolor=black,
+ urlcolor=black
+}
+\usepackage{pdflscape}
+
+\title{Bezpečné doručení distribučních balíčků}
+\author{Karel Kočí}
+\date{26.5.2018}
+
+\begin{document}
+
+\frame{\titlepage}
+
+\begin{frame}
+ \def\svgwidth{10cm}
+ \input{turris-logo.pdf_tex}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Balíček?}
+ \def\svgwidth{2cm}
+ \input{package.pdf_tex}
+
+ \begin{itemize}
+ \item Meta informace (název, verze, ...)
+ \item Soubory
+ \item Hashe pro soubory
+ \end{itemize}
+
+ Indexovány a uloženy v repositářích
+ \begin{itemize}
+ \item Repositář obsahuje index
+ \item Index obsahuje hashe balíčků a další meta informace
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Krypto terminologie}
+ \begin{itemize}
+ \item Hash
+ \item Asymetrická šifra
+ \item Kryptografický podpis
+ \item Certifikační autorita
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Útok \#1: Podvrhnutí repositářů}
+ \begin{itemize}
+ \item Vlastní server s upravenými balíčky distribuce
+ \item Kompromitace připojení k Internetu
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Ochrana \#1: Podpis}
+ \begin{itemize}
+ \item Před-distribuovaný veřejný klíč
+ \item Podepsané balíčky nebo index repositáře (lépe index)
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Útok \#2: Podvrhnutí starší verze repositářů}
+ \begin{itemize}
+ \item Kopie repositářů distribuce se známou zranitelností (Heartbleed,
+ CVE-2016-0777 CVE-2016-0778, ...)
+ \item Vlastní server se starší kopií repositářů distribuce
+ \item Kompromitace připojení k Internetu
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{``Ochrana'' \#2: Porovnání verzí}
+ Balíčky je možné pouze updatovat
+ \begin{itemize}
+ \item Downgrade je nutné schválit (ale jen u některých a uživatel...)
+ \item Downgrade je občas legitimní
+ \item Co update ze staré verze systému? (pravidelné aktualizace)
+ \item Co instalace?
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Ochrana \#2: HTTPS a SSL}
+ \begin{itemize}
+ \item Server s repositáři se ověřuje validním certifikátem
+ \item Identita serveru (jeho DNS jméno a pod.) je podepsána
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Útok \#3: Vlastní certifikát}
+ \begin{itemize}
+ \item Kopie repositářů distribuce se známou zranitelností
+ \item Vlastní server se starší kopií repositářů distribuce
+ \item Vlastní certifikát s totožnou identitou od "důvěryhodné" autority
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Ochrana \#3: Certification pinning}
+ \begin{itemize}
+ \item Omezit počet důvěryhodných certifikátů (pár vybraných)
+ \item Vždy mějte vlastní certifikační autoritu jako fallback!
+ \item Tak trochu hra v kostky
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Útok \#4: Podvrhnutí DNS}
+ \begin{itemize}
+ \item Kopie repositářů distribuce se známou zranitelností
+ \item Vlastní server se starší kopií repositářů distribuce
+ \item Kompromitace používaného DNS serveru (např: otrávení) a podvrhnutí
+ vlastní IP
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Ochrana \#4: DNSSEC}
+ \begin{itemize}
+ \item Kontrola správnosti DNS odpovědi pomocí podpisů
+ \item Odpověď je stejná tak jak ji poskytuje příslušný autoritativní
+ server
+ \end{itemize}
+
+ \begin{itemize}
+ \item Nutné správné nastavení systému nejenom aplikace
+ \item Nízké uvědomění uživatelů o užitečnosti DNSSEC
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Útok \#5: BGP leak IP}
+ \begin{itemize}
+ \item Kopie repositářů distribuce se známou zranitelností
+ \item Vlastní server se starší kopií repositářů distribuce
+ \item Zneužití BGP ohlašování a přesměrování
+ \item Vlastní důvěryhodný certifikát s totožnou identitou (Let 's Encrypt)
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Ochrana \#5: RPKI}
+ \begin{itemize}
+ \item Kryptografické ověření přidělení ohlašované IP adresy
+ \end{itemize}
+
+ \begin{itemize}
+ \item Nižší rozšířenost
+ \item Uživatelsky nekontrolovatelné a nevynutitelné
+ \item Výrazně složitý útok
+ \end{itemize}
+\end{frame}
+
+\begin{frame}
+ \frametitle{Děkuji za pozornost}
+ Udržujte svoje systémy aktuální!
+
+ Nastavte si DNSSEC!
+\end{frame}
+
+
+\end{document}
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new file mode 100644
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