diff options
Diffstat (limited to '2018-cryptofest')
| -rw-r--r-- | 2018-cryptofest/makefile | 10 | ||||
| -rw-r--r-- | 2018-cryptofest/package.svg | 485 | ||||
| -rw-r--r-- | 2018-cryptofest/pres.pdf | bin | 0 -> 99984 bytes | |||
| -rw-r--r-- | 2018-cryptofest/pres.tex | 182 | ||||
| -rw-r--r-- | 2018-cryptofest/turris-logo.svg | 46 |
5 files changed, 723 insertions, 0 deletions
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+\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! 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