Updated slides

[talk/dnssec.git] / slides.tex

\documentclass[13pt]{beamer}
\usepackage{ngerman}
\usepackage{multicol}
\usepackage[utf8]{inputenc}
\usepackage{listings}

\usepackage{tikz}

\usetikzlibrary{positioning,intersections,backgrounds,calc,shadings,shapes.arrows,shapes.symbols,shadows}
\usepgflibrary{shapes.geometric}
\usepgflibrary{shapes.misc}
\usepgflibrary{shapes.symbols}
\usepgflibrary{shapes}
\usetikzlibrary{shapes,decorations,shadows}
\usetikzlibrary{decorations.pathmorphing}
\usetikzlibrary{decorations.shapes}
\usetikzlibrary{decorations.text}
\usetikzlibrary{fadings}
\usetikzlibrary{patterns}
\usetikzlibrary{calc}
\tikzstyle{netdb}=[anchor=center,color=black,rectangle,draw,minimum
size=.6em,minimum height=.2em]
\tikzstyle{client}=[fill=i4gray,rectangle,draw]
\tikzstyle{chain}=[rectangle,draw,minimum size=1em,minimum height=.5em]
\tikzstyle{arrow}=[->,thick,draw,shorten <=2pt,shorten >=2pt,]
\tikzstyle{tunnel}=[fill=gray,shape=ellipse,minimum size=4em,minimum height=1.1em]


\usetheme{CambridgeUS}
\usefonttheme{structuresmallcapsserif}
\title{DNSSEC}
\author{Christoph Egger}
%\institute[Debian]{The Debian Project}
\date{\today}

\usebackgroundtemplate{\includegraphics[width=\paperwidth]{images/swirl-lightest}}
\logo{\includegraphics[viewport=274 335 360 440,width=1cm]{images/openlogo-nd.pdf}}
\definecolor{debianred}{rgb}{.780,.000,.211} % 199,0,54
\definecolor{debianblue}{rgb}{0,.208,.780} % 0,53,199
\definecolor{debianlightbackgroundblue}{rgb}{.941,.941,.957} % 240,240,244
\definecolor{debianbackgroundblue}{rgb}{.776,.784,.878} % 198,200,224

\usecolortheme[named=debianbackgroundblue]{structure}
\setbeamercolor{normal text}{fg=debianred}
\setbeamercolor{titlelike}{fg=debianblue}
\setbeamercolor{sidebar}{fg=debianred,bg=debianbackgroundblue}

\setbeamercolor{palette sidebar primary}{fg=debianred}
\setbeamercolor{palette sidebar secondary}{fg=debianred}
\setbeamercolor{palette sidebar tertiary}{fg=debianred}
\setbeamercolor{palette sidebar quaternary}{fg=debianred}

\setbeamercolor{block title}{fg=debianblue}
\setbeamercolor{description item}{fg=debianblue}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% http://www.texample.net/media/tikz/examples/TEX/network-topology.tex %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\makeatletter
\pgfkeys{/pgf/.cd,
  parallelepiped offset x/.initial=2mm,
  parallelepiped offset y/.initial=2mm
}
\pgfdeclareshape{parallelepiped}
{
  \inheritsavedanchors[from=rectangle] % this is nearly a rectangle
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{north west}
  \inheritanchor[from=rectangle]{north east}
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{east}
  \inheritanchor[from=rectangle]{mid}
  \inheritanchor[from=rectangle]{mid west}
  \inheritanchor[from=rectangle]{mid east}
  \inheritanchor[from=rectangle]{base}
  \inheritanchor[from=rectangle]{base west}
  \inheritanchor[from=rectangle]{base east}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{south west}
  \inheritanchor[from=rectangle]{south east}
  \backgroundpath{
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    \pgfmathsetlength\pgfutil@tempdimb{\pgfkeysvalueof{/pgf/parallelepiped
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    \pgfpathlineto{\pgfpointadd{\pgfpoint{\pgf@xb}{\pgf@ya}}{\ppd@offset}}
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    \pgfpathlineto{\pgfpointadd{\pgfpoint{\pgf@xa}{\pgf@yb}}{\ppd@offset}}
    \pgfpathlineto{\pgfqpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathmoveto{\pgfqpoint{\pgf@xb}{\pgf@yb}}
    \pgfpathlineto{\pgfpointadd{\pgfpoint{\pgf@xb}{\pgf@yb}}{\ppd@offset}}
  }
}
\makeatother

\tikzset{l3 switch/.style={
    parallelepiped,fill=switch, draw=white,
    minimum width=0.75cm,
    minimum height=0.75cm,
    parallelepiped offset x=1.75mm,
    parallelepiped offset y=1.25mm,
    path picture={
      \node[fill=white,
        circle,
        minimum size=6pt,
        inner sep=0pt,
        append after command={
          \pgfextra{
            \foreach \angle in {0,45,...,360}
            \draw[-latex,fill=white] (\tikzlastnode.\angle)--++(\angle:2.25mm);
          }
        }
      ]
       at ([xshift=-0.75mm,yshift=-0.5mm]path picture bounding box.center){};
    }
  },
  ports/.style={
    line width=0.3pt,
    top color=gray!20,
    bottom color=gray!80
  },
  rack switch/.style={
    parallelepiped,fill=white, draw,
    minimum width=1.25cm,
    minimum height=0.25cm,
    parallelepiped offset x=2mm,
    parallelepiped offset y=1.25mm,
    xscale=-1,
    path picture={
      \draw[top color=gray!5,bottom color=gray!40]
      (path picture bounding box.south west) rectangle
      (path picture bounding box.north east);
      \coordinate (A-west) at ([xshift=-0.2cm]path picture bounding box.west);
      \coordinate (A-center) at ($(path picture bounding box.center)!0!(path
        picture bounding box.south)$);
      \foreach \x in {0.275,0.525,0.775}{
        \draw[ports]([yshift=-0.05cm]$(A-west)!\x!(A-center)$)
          rectangle +(0.1,0.05);
        \draw[ports]([yshift=-0.125cm]$(A-west)!\x!(A-center)$)
          rectangle +(0.1,0.05);
       }
      \coordinate (A-east) at (path picture bounding box.east);
      \foreach \x in {0.085,0.21,0.335,0.455,0.635,0.755,0.875,1}{
        \draw[ports]([yshift=-0.1125cm]$(A-east)!\x!(A-center)$)
          rectangle +(0.05,0.1);
      }
    }
  },
  server/.style={
    parallelepiped,
    fill=white, draw,
    minimum width=0.35cm,
    minimum height=0.75cm,
    parallelepiped offset x=3mm,
    parallelepiped offset y=2mm,
    xscale=-1,
    path picture={
      \draw[top color=gray!5,bottom color=gray!40]
      (path picture bounding box.south west) rectangle
      (path picture bounding box.north east);
      \coordinate (A-center) at ($(path picture bounding box.center)!0!(path
        picture bounding box.south)$);
      \coordinate (A-west) at ([xshift=-0.575cm]path picture bounding box.west);
      \draw[ports]([yshift=0.1cm]$(A-west)!0!(A-center)$)
        rectangle +(0.2,0.065);
      \draw[ports]([yshift=0.01cm]$(A-west)!0.085!(A-center)$)
        rectangle +(0.15,0.05);
      \fill[black]([yshift=-0.35cm]$(A-west)!-0.1!(A-center)$)
        rectangle +(0.235,0.0175);
      \fill[black]([yshift=-0.385cm]$(A-west)!-0.1!(A-center)$)
        rectangle +(0.235,0.0175);
      \fill[black]([yshift=-0.42cm]$(A-west)!-0.1!(A-center)$)
        rectangle +(0.235,0.0175);
    }
  },
}

\usetikzlibrary{calc, shadings, shadows, shapes.arrows}

% Styles for interfaces and edge labels
\tikzset{%
  interface/.style={draw, rectangle, rounded corners, font=\LARGE\sffamily},
  ethernet/.style={interface, fill=yellow!50},% ethernet interface
  serial/.style={interface, fill=green!70},% serial interface
  speed/.style={sloped, anchor=south, font=\large\sffamily},% line speed at edge
  route/.style={draw, shape=single arrow, single arrow head extend=4mm,
    minimum height=1.7cm, minimum width=3mm, white, fill=switch!20,
    drop shadow={opacity=.8, fill=switch}, font=\tiny}% inroute/outroute arrows
}
\newcommand*{\shift}{1.3cm}% For placing the arrows later

% The router icon
\newcommand*{\router}[1]{
\begin{tikzpicture}
  \coordinate (ll) at (-3,0.5);
  \coordinate (lr) at (3,0.5);
  \coordinate (ul) at (-3,2);
  \coordinate (ur) at (3,2);
  \shade [shading angle=90, left color=switch, right color=white] (ll)
    arc (-180:-60:3cm and .75cm) -- +(0,1.5) arc (-60:-180:3cm and .75cm)
    -- cycle;
  \shade [shading angle=270, right color=switch, left color=white!50] (lr)
    arc (0:-60:3cm and .75cm) -- +(0,1.5) arc (-60:0:3cm and .75cm) -- cycle;
  \draw [thick] (ll) arc (-180:0:3cm and .75cm)
    -- (ur) arc (0:-180:3cm and .75cm) -- cycle;
  \draw [thick, shade, upper left=switch, lower left=switch,
    upper right=switch, lower right=white] (ul)
    arc (-180:180:3cm and .75cm);
  \node at (0,0.5){\color{blue!60!black}\Huge #1};% The name of the router
  % The four arrows, symbols for incoming and outgoing routes:
  \begin{scope}[yshift=2cm, yscale=0.28, transform shape]
    \node[route, rotate=45, xshift=\shift] {\strut};
    \node[route, rotate=-45, xshift=-\shift] {\strut};
    \node[route, rotate=-135, xshift=\shift] {\strut};
    \node[route, rotate=135, xshift=-\shift] {\strut};
  \end{scope}
\end{tikzpicture}}

\makeatletter
\pgfdeclareradialshading[tikz@ball]{cloud}{\pgfpoint{-0.275cm}{0.4cm}}{%
  color(0cm)=(tikz@ball!75!white);
  color(0.1cm)=(tikz@ball!85!white);
  color(0.2cm)=(tikz@ball!95!white);
  color(0.7cm)=(tikz@ball!89!black);
  color(1cm)=(tikz@ball!75!black)
}
\tikzoption{cloud color}{\pgfutil@colorlet{tikz@ball}{#1}%
  \def\tikz@shading{cloud}\tikz@addmode{\tikz@mode@shadetrue}}
\makeatother

\tikzset{my cloud/.style={
     cloud, draw, aspect=2,
     cloud color={gray!5!white}
  }
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}

\frame{
  \titlepage
}

\section{Einführung}

\begin{frame}
  \begin{block}{Wikipedia}
    The Domain Name System Security Extensions (DNSSEC) is a suite of
    Internet Engineering Task Force (IETF) specifications for securing
    certain kinds of information provided by the Domain Name System
    (DNS) as used on Internet Protocol (IP) networks. It is a set of
    extensions to DNS which provide to DNS clients (resolvers) origin
    authentication of DNS data, authenticated denial of existence, and
    data integrity, but not availability or confidentiality.
  \end{block}
\end{frame}

\begin{frame}
  \frametitle{DNS Anfrage}
  \begin{figure}
    \centering
    \begin{tikzpicture}
      \begin{scope}[yshift=-5em, xshift=-5em]
        \node[scale=1.5, server,debianblue](Client){};
        \node[scale=1.5, server, left of=Client, xshift=-.75em](Gateway){};
        \node[scale=1.5, server, left of=Gateway, xshift=-2em](ISP){};

        \draw[thick,darkgray!10!gray] (Client.west)--(Gateway.east);
        \draw[thick,darkgray!10!gray] (Gateway.west)--(ISP);
      \end{scope}

      \begin{scope}[xshift=15em, yshift=5em]
        \node[thick, draw=darkgray, dotted, minimum width=12em, minimum
        height=9em, xshift=-3.5em, yshift=-.5em] (siccegge) {};
        \node[scale=1.2, server,debianblue](Master){};
        \node[scale=1.2, server, right of=Master, yshift= 1.5em, xshift=1em](Slave 1){};
        \node[scale=1.2, server, right of=Master, yshift=-1.5em, xshift=1em](Slave 2){};

        \draw[thick,darkgray!10!gray] (Master.east)--(Slave 1);
        \draw[thick,darkgray!10!gray] (Master.east)--(Slave 2);
      \end{scope}

      \begin{scope}[yshift=5em]
        \node[thick, draw=darkgray, dotted, minimum width=12em, minimum
        height=9em, xshift=-3.5em, yshift=-.5em] (de) {};
        \node[scale=1.2, server,debianblue](Sub Master){};
        \node[scale=1.2, server, right of=Sub Master, yshift= 1.5em,
        xshift=1em](Sub Slave 1){};
        \node[scale=1.2, server, right of=Sub Master, yshift=-1.5em,
        xshift=1em](Sub Slave 2){};

        \draw[thick,darkgray!10!gray] (Sub Master.east)--(Sub Slave 1);
        \draw[thick,darkgray!10!gray] (Sub Master.east)--(Sub Slave 2);
      \end{scope}

      \draw[thick,darkgray!10!gray,dotted] (ISP.north)--(Sub Slave 2.south);
      \draw[thick,darkgray!10!gray,dotted] (ISP.north)--(Slave 2.south);

      \node[darkgray,above=.7em of Client.north,font=\LARGE] {Client};
      \node[darkgray,below=0 of Gateway.south,font=\LARGE] {Heimrouter};
      \node[darkgray,below=0 of ISP.south,font=\LARGE] {ISP};

      \node[darkgray,below=0 of Master.south,font=\LARGE] {Master};
      \node[darkgray,below=0 of Slave 2.south,font=\LARGE] {Slaves};
      \node[darkgray,below=0 of Sub Master.south,font=\LARGE] {Master};
      \node[darkgray,below=0 of Sub Slave 2.south,font=\LARGE] {Slaves};
      \node[darkgray, above=0 of de, font=\LARGE]{.de};
      \node[darkgray, above=0 of siccegge, font=\LARGE]{.siccegge.de};
    \end{tikzpicture}
  \end{figure}
\end{frame}

\section{Signaturen}

\begin{frame}
  \frametitle{ZSK, KSK}
  \begin{itemize}
  \item \texttt[KSK] ``KeySigningKey'' -- wird in der übergeordneten
    Zone referenziert und signiert alle Schlüssel \emph{in} der Zone
    \pause
  \item \texttt[ZSK] ``ZoneSigningKey'' -- wird durch den \texttt{KSK}
    authorisiert und signiert weitere Einträge
    \pause\bigskip
  \item Normalerweise gibt es \emph{einen} KSK und \emph{zwei} ZSKs in
    einer Zone
  \end{itemize}
\end{frame}

\begin{frame}
  \begin{figure}
    \centering
    \begin{tikzpicture}[scale=1.2]
      \tikzstyle{every node}=[font=\small]
      \node[minimum width=8em,minimum height=12em,draw=gray](dezone) at (0,0) {};
      \node[below=2em of dezone.south] {de. Zone};
      \node[minimum width=8em,minimum height=12em,draw=gray](rootzone) at (-9em,0) {};
      \node[below=2em of rootzone.south] {. Zone};
      \node[minimum width=8em,minimum height=12em,draw=gray](sicceggezone) at (9em,0) {};
      \node[below=2em of sicceggezone.south] {siccegge.de. Zone};

      \node[ellipse,draw=debianred](rootksk) at (-9em,3em) {KSK};
      \node[ellipse,draw=debianblue](rootzsk) at (-9em,0em) {ZSK};
      \node[ellipse,draw=black](rootds)  at (-9em,-3em) {DS};

      \node[ellipse,draw=debianred](deksk)  at (0em,3em) {KSK};
      \node[ellipse,draw=debianblue](dezsk)  at (0em,0em) {ZSK};
      \node[ellipse,draw=black](deds)   at (0em,-3em) {DS};

      \node[ellipse,draw=debianred](sicceggeksk)  at (9em,3em) {KSK};
      \node[ellipse,draw=debianblue](sicceggezsk)  at (9em,0em) {ZSK};
      \node[ellipse,draw=black](arecord) at (6.5em,-2em) {\tiny{A}};
      \node[ellipse,draw=black](aaaarecord) at (8em,-3em) {\tiny{AAAA}};
      \node[ellipse,draw=black](sshfprecord) at (10.5em,-4em) {\tiny{SSHFP}};

      \draw[arrow,draw=black] (rootds.south) |- ++(0,-2em) -| ([xshift=1em]rootzone.east)
        |- ([xshift=4.5em,yshift=1em]rootzone.north) -| (deksk.north);
      \draw[arrow,draw=black] (deds.south) |- ++(0,-2em) -| ([xshift=1em]dezone.east)
        |- ([xshift=4.5em,yshift=1em]dezone.north) -| (sicceggeksk.north);

      \draw[arrow,draw=debianred] (rootksk.south) -- (rootzsk.north);
      \draw[arrow,draw=debianred] (deksk.south) -- (dezsk.north);
      \draw[arrow,draw=debianred] (sicceggeksk.south) -- (sicceggezsk.north);

      \draw[arrow,draw=debianblue] (rootzsk) -- (rootds);
      \draw[arrow,draw=debianblue] (dezsk) -- (deds);
      \draw[arrow,draw=debianblue] (sicceggezsk) -- (arecord);
      \draw[arrow,draw=debianblue] (sicceggezsk) -- (aaaarecord);
      \draw[arrow,draw=debianblue] (sicceggezsk) -- (sshfprecord);
    \end{tikzpicture}
  \end{figure}
\end{frame}

\begin{frame}
  \frametitle{RRSIG}
  \begin{block}{siccegge.de}\resizebox{\textwidth}{!}{\texttt{
        \begin{tabular}{llll}
siccegge.de. & IN & A & 62.113.200.104\\
siccegge.de. & IN & RRSIG & A 8 2 43200 20140908181927 20140809171927 60018 siccegge.de.\\
 &
 \multicolumn{3}{l}{zldkAFJKKV4/gkmZ8DZkV7AT6nIt4mLXjClJwSnGqvrlBWEzc9h3knLMa9iJeEh01ZEZcWi+JRD/vVVNqBg4P1}\\
 & \multicolumn{3}{l}{vCGsiPDvzBvO+gq0wtxPPpouNZA9r9h9in4sB3Vw/6HpMcqp843mB+B5SGQZkALDsVCcoY4J0/rPWPXYGHQkA=}\\
\end{tabular}}}
  \end{block}
\end{frame}

\begin{frame}
  \frametitle{Schlüsseltausch}
  \begin{block}{Idee}
    Wechsle die Schlüssel regelmäßig. Damit lassen sich auch kleine,
    effizienter verwendbare Schlüssel verwenden (DNS verwendet
    UDP!). Auch in Sachen ``Revocation'' nützlich
  \end{block}
  \bigskip\pause
  Schlüssel wechseln in DNS ist nicht so einfach: \pause Stichpunkt
  \texttt{TTL}
  \bigskip\pause

  2 Methoden:
  \begin{itemize}
  \item Neuen Schlüssel vor der Verwendung veröffentlichen
  \item Vorübergehend die Daten mit beiden Schlüsseln signieren
  \end{itemize}
\end{frame}

\section{NSEC und NSEC3}
\begin{frame}
  \frametitle{Negative antworten}

  \begin{block}{Problem}
    Mit den \texttt{RRSIG}s lassen sich bestehende Einträge im DNS
    bestätigen. Es ist aber immer noch möglich, Einträge
    ``verschwinden'' zu lassen. Was also noch fehlt ist die
    Möglichkeit, die nicht-Existenz von Einträgen zu signieren.
  \end{block}
\end{frame}

%TODO Why
\begin{frame}<1>[label=nsec]
  \frametitle{NSEC}
  \begin{itemize}
  \item<1-> Bilde einen Kreis, der alle vorhandenen Einträge umfasst
  \item<2-> Speichere signierte Feststellung, dass zwischen zwei Namen
    kein dritter liegt
  \item<2-> Bei negativer Antwort (\texttt{NXDOMAIN}) sende auch den
    signierten \texttt{NSEC} Eintrag in dessen Interval die Antwort
    liegen würde\pause\bigskip
  \item<3> ``Zonewalking'' auflistung aller Einträge in einer Zone
  \end{itemize}
\end{frame}

\begin{frame}<-2>[label=ring]
  \begin{figure}
    \centering
    \begin{tikzpicture}[scale=0.9]
      \onslide<2>{
        \fill[debianred!10] (165:17mm) arc (165:215:17mm) -- (215:27mm)
        arc (215:165:27mm) -- cycle;

        \path[decoration = {text along path, text = {NSEC},
          text align = {align = center}, raise = -0.5ex}, decorate]
        (201:29mm) arc (201:155:29mm);
      }

      \onslide<5>{
        \fill[debianred!10] (123:17mm) arc (123:172:17mm) -- (172:27mm)
        arc (172:123:27mm) -- cycle;

        \path[decoration = {text along path, text = {NSEC3},
          text align = {align = center}, raise = -0.5ex}, decorate]
        (180:14mm) arc (180:123:14mm);
      }

      \foreach \sector/\sectorlabel/\hash/\hashlabel in {%
        0/annex/5kau\dots/keyserver,
        1/backup/evj1\dots/www,
        2/git/imua\dots/git,
        3/keyserver/mk9e\dots/wot,
        4/static/nq8c\dots/backup,
        5/webdav/qp1c\dots/static,
        6/wot/thm6\dots/webdav,
        7/www/uv8c\dots/annex}%
      {
        \node[font=\bfseries](node\sector) at ({45 * (-\sector - .5)}: 22mm) {\alt<-3>{\sectorlabel}{\hash}};

        \draw[->, >=latex] ({45 * (-\sector - .5)-10}:22mm)
        arc ({45 * (-\sector - .5) - 10}:{45 * (-\sector-1)- 10}:22mm);

        \onslide<4->{
          \node[font=\bfseries, circle, fill=debianblue!50, text=darkgray](hash\sector) at ({45 * (-\sector -
            .5) + 15}:32mm) {H};

          \node[font=\bfseries](orig\sector) at ({45 * (-\sector -
            .5) + 25}: 45mm) {\hashlabel};
          \draw[arrow, draw=darkgray] (hash\sector) -- (node\sector);)
          \draw[arrow, draw=darkgray] (orig\sector) -- (hash\sector);)
        }
      }
      \node[font=\bfseries, left=8em of node3](null) {null};
      \onslide<-2>{
        \draw[arrow] (null.east) -- ([yshift=1.5em]node3.west);
      }
      \onslide<4->{
        \node[font=\bfseries, circle, fill=debianblue!50, above=3em
        of null.north, xshift=2em, text=darkgray] (H) {H};
        \draw[arrow, draw=darkgray] (null) -- (H);
        \draw[arrow] (H) to node[above,font=\bfseries]{qfna\dots} ([yshift=1.5em]node4.north);
      }
    \end{tikzpicture}
  \end{figure}
\end{frame}

\againframe<2->{nsec}

\begin{frame}<1>[label=nsec3]
  \frametitle{NSEC3}

  \begin{itemize}
  \item Statt Einträge in einem Ring anzuordnen, bilde zuerst eine
    kryptographische Streusumme \pause
  \item Verwende Salz und mehrere Runden der Streufunktion für
    maximalen Effekt.
  \end{itemize}\bigskip
  \begin{block}{git.siccegge.de}\resizebox{\textwidth}{!}{\texttt{
        \begin{tabular}{llll}
siccegge.de. & IN & NSEC3PARAM & 1 0 5 6D1DAF17E2A6A252
\end{tabular}}}
  \end{block}
\end{frame}

\againframe<3->{ring}

\againframe<2->{nsec3}

\begin{frame}
  \frametitle{Überprüfung negativer Antworten}
  \begin{block}{Ziel}
    Es ist trivial, in der \texttt{de}-Zone zu zeigen, dass dort
    \texttt{www.siccegge.de} nicht existiert -- obwohl der name
    durchaus vorhanden ist (allerdings nicht in der \texttt{de}-Zone
    sondern in der \texttt{siccegge.de}-Zone). Wir müssen also auch
    zeigen, dass wir in der ``richtigen'' Zone operieren.
  \end{block}\pause
  \begin{block}{``Closest Encloser''}
    Daher 3 \texttt{NSEC3}-Einträge:
    \begin{itemize}
    \item Für die kürzeste, nicht mehr existente Oberdomäne zur
      Anfrage, den \texttt{NSEC3}-Eintrag, der das Intervall überspannt.
    \item den um eine Komponente gekürzten \texttt{NSEC3}-Eintrag, der
      entweder auch das Flag für \texttt{SOA} oder \emph{keinen}
      \texttt{NS}-Eintrag enthält.\pause
    \item den \texttt{NSEC3}-Eintrag, der das Fehlen eines
      Wildcard-Eintrags an dieser Stelle nachweist.
    \end{itemize}
  \end{block}
\end{frame}

\begin{frame}
  \frametitle{Negative Antwort}
  \begin{block}{siccegge.de hat SOA}\resizebox{\textwidth}{!}{\texttt{
     \begin{tabular}{rl}
 4ma0fb5t2s6kjtgc6r3qi4o49bn7pc4i.siccegge.de. & 3573 IN NSEC3 1 0 5 6D1DAF17E2A6A252 \\
 4TRVQLKF545FSK90ED6NCJ7DGMOJB6I8 & A NS SOA MX AAAA RRSIG DNSKEY NSEC3PARAM \\
     \end{tabular}}}
  \end{block}
  \texttt{null.siccegge.de} hat den Hash-Wert \texttt{qfna56rlmnlbp3e85m4d6ckonnmpfg1i}
  \begin{block}{null.siccegge.de existiert nicht}\resizebox{\textwidth}{!}{\texttt{
     \begin{tabular}{rl}
 qd2uevk27c2tdrh6535e0mkiratu1t5h.siccegge.de. & 3600 IN NSEC3 1 0 5 6D1DAF17E2A6A252 \\
 QLLMC1NCRMN4AU8QCFQ24VAH7JFM6LQ6 & \\
     \end{tabular}}}
  \end{block}
  \texttt{*.siccegge.de} hat den Hash-Wert \texttt{68m2atv9712l3e67oua61u5hp0v0273a.}
  \begin{block}{*.siccegge.de existiert nicht }\resizebox{\textwidth}{!}{\texttt{
     \begin{tabular}{rl}
 63r09adu0p1vdmkif5eb4dr6m2a3l5cp.siccegge.de. & 3600 IN NSEC3 1 0 5 6D1DAF17E2A6A252 \\
 6BJ555D3Q50SL34D50L1PGU887R73DC9 & RRSIG TLSA \\
     \end{tabular}}}
  \end{block}
\end{frame}

\section{Zusatznutzen}
\begin{frame}{DANE}
  Nachdem unser DNS jetzt kryptographisch abgesichert ist (auch nicht
  schlechter als das CA System) kann man dort jetzt sicher weiteres
  Schlüsselmaterial ausliefern:
  \begin{itemize}
  \item TLSA für alles was SSL/TLS macht
  \item SSHFP für SSH Fingerprints
  \item PGP-Schlüssel-Enträge
  \item \dots
  \end{itemize}
\end{frame}

\begin{frame}
  \frametitle{TLSA}
  \begin{block}{TLSA}\resizebox{\textwidth}{!}{\texttt{
        \begin{tabular}{llll}
\_25.\_tcp.oteiza.siccegge.de. & IN & TLSA & 3 1 1
101B5B5CCDC5568CEC385552611FD0355BF15DB293E96F46E29DE4A0C4B2BC3F \\
\_443.\_tcp.siccegge.de. & IN & TLSA & 3 1 1
62BEBD9F2E77CF26A4006A50F69FC3891BF7BEDDAEF8AC96E57C1D9BA2AB1F73 \\
\_5222.\_tcp.xmpp.egger.im & IN & TLSA & 3 1 1 9c93fab0d88c911592dedfa7f9385aeee228b0c6d526813ad1182c983677736b
\end{tabular}}}
  \end{block}
  \bigskip\pause
  Achtung! Beim Schlüsseltausch gibt's wieder Spass.
  \bigskip\pause
  \begin{itemize}
  \item 3: Bezeichnet ein Service Zertifikat
  \item 1: Angegeben wird der öffentlich Schlüssel, nicht das
    Zertifikat
  \item 1: Angegeben wird eine \texttt{SHA256}-Summe
  \end{itemize}
\end{frame}

\begin{frame}
  \frametitle{SSHFP}
  \begin{block}{git.siccegge.de}\resizebox{\textwidth}{!}{\texttt{
        \begin{tabular}{lll}
git.siccegge.de & IN & SSHFP 1 1 0E812EE0A3704230F3C415076E1BAA149A5DC75B\\
git.siccegge.de & IN & SSHFP 1 2 1CBACAF365040DC1DF841FD07D9186BC343D4AF7DCF689CC8CF4A2F75D7F4B57\\
git.siccegge.de & IN & SSHFP 3 1 A2D0495E912DA039EEA51A1593F7F74FB919AAD4\\
git.siccegge.de & IN & SSHFP 3 2 9BF73E3654AA65B847054247F85EFB5C88AB7460840B9C922E647B00696661CF\\
git.siccegge.de & IN & SSHFP 4 1 2A3EF64AC589193ACFAD783B62E3C193A67F3F46\\
git.siccegge.de & IN & SSHFP 4 2 880686195D6C1AAA6791F3A3EF4E7B565DCF9F560F2F1BBB93C56EFD5996F335\\
\end{tabular}}}
  \end{block}
  \bigskip\pause
  \begin{itemize}
  \item Erste Zahl: Hostkeytyp
  \item Zweite Zahl: Prüfsummentyp
  \end{itemize}
\end{frame}

\section{Software}
\begin{frame}{Überblick}
  \begin{block}{Nameserver}
    Müssen zusätzliche Einträge ausliefern (\texttt{RRSIG},
    \texttt{NSEC3}). Für \texttt{NSEC3} müssen die richtigen Einträge
    gefunden wernden
  \end{block}\pause
  \begin{block}{Signaturwerkzeuge}
    \begin{itemize}
    \item Müssen \texttt{RRSIG}s für die vorhandenen Einträge
      erstellen und gelegentlich erneuern
    \item Müssen die \texttt{NSEC3}- und \texttt{NSEC3PARAM}-Einträge
      erstellen und signieren
    \item Müssen möglichkeit zum Schlüsseltausch beiten
    \end{itemize}
  \end{block}\pause
  \begin{block}{Registrar}
    Irgendwie müssen die Schlüssel in die darüberliegende Zone
    kommen. Wenige Registrare haben das schon im Interface vorgesehen,
    etliche lassen sich aber per Mail an den Support überreden
  \end{block}
\end{frame}

\begin{frame}{Nameserver}
  \begin{block}{Software}
    Alle nennenswerten Nameserver (nsd, bind, powerdns, knot, \dots) können heutzutage DNSSEC ausliefern.
  \end{block}\pause
  \begin{block}{Sekundärserver}
    Kaum ein kostenfreier Sekundärserveranbieter unterstützt DNSSEC --
    das liegt unter anderem an den deutlich größeren Antworten und dem
    Rechenbedarf für \texttt{NSEC3}, die signifikant Resourcen
    verbrauchen.

    $\Rightarrow$ Selber hosten (mit Freunden) oder beim Registrar schauen.
  \end{block}
\end{frame}

\begin{frame}{Signaturwerkzeuge}
  Im Grunde gibt es zwei Typen von Signaturwerkzeugen
  \begin{block}{Im primären Nameserver}
    BIND, Knot, PowerDNS
    \begin{description}
    \item[Vorteile] Keine weiteren Werkzeuge, dynamische Updatesmöglich
    \item[Nachteile] Schlüsselmaterial im Netzwerkserver, bestehende
      Implementierungen unflexibel in Sachen Schlüsselrotation
    \end{description}
  \end{block}\pause
  \begin{block}{Separates Signaturwerkzeug}
    OpenDNSSEC, dnssec-tools, cron
    \begin{description}
    \item[Vorteile] Flexibel, Signaturlösung Nameserver-agnostisch
    \item[Nachteile] Softwarequalität \dots, weiteres Element, das
      kaputt gehen kann
    \end{description}
  \end{block}
\end{frame}

\begin{frame}{Fragen?}
    \vspace*{\fill}
    \begin{center}
        \includegraphics[width=7cm]{images/42.pdf}
    \end{center}
    \vspace*{\fill}
\end{frame}

\end{document}