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Commit 194d3134 authored by Peter Gerwinski's avatar Peter Gerwinski
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Vorbereitung 9.11.2023

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% dbs-20221109.pdf - Lecture Slides on Databases and Information Security
% Copyright (C) 2023 Peter Gerwinski
%
% This document is free software: you can redistribute it and/or
% modify it either under the terms of the Creative Commons
% Attribution-ShareAlike 3.0 License, or under the terms of the
% GNU General Public License as published by the Free Software
% Foundation, either version 3 of the License, or (at your option)
% any later version.
%
% This document is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this document. If not, see <http://www.gnu.org/licenses/>.
%
% You should have received a copy of the Creative Commons
% Attribution-ShareAlike 3.0 Unported License along with this
% document. If not, see <http://creativecommons.org/licenses/>.
% README: Kurzeinführung TCP/IP
\documentclass[10pt,t]{beamer}
\usepackage{pgslides}
\usepackage{tikz}
\usepackage{rotating}
\newcommand{\vfilll}{\vspace{0pt plus 1filll}}
\newcommand{\underconstruction}{%
\begin{picture}(0,0)
\put(11,1.2){\makebox(0,0)[b]{\includegraphics[width=1.5cm]{Zeichen_123.pdf}}}
\put(11,0.9){\makebox(0,0)[t]{\shortstack{Änderungen\\vorbehalten}}}
\end{picture}}
\title{Datenbanken und Datensicherheit}
\author{Prof.\ Dr.\ rer.\ nat.\ Peter Gerwinski}
\date{9.\ November 2023}
\definecolor{ethernet}{rgb}{0.95,0.95,0.95}
\definecolor{ip}{rgb}{0.85,0.85,1.0}
\definecolor{tcp}{rgb}{0.925,1.0,0.925}
\definecolor{data}{rgb}{1.0,0.85,0.85}
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\begin{document}
\maketitleframe
\nosectionnonumber{\inserttitle}
\begin{frame}
\shownosectionnonumber
\begin{itemize}
\item[\textbf{1}] \textbf{Einführung}
\hfill\makebox(0,0)[br]{\raisebox{2.25ex}{\url{https://gitlab.cvh-server.de/pgerwinski/dbs}}}%
\item[\textbf{2}] \textbf{Kurzeinführung Unix}
\item[\textbf{3}] \textbf{Kurzeinführung TCP/IP}
\begin{itemize}
\item[3.1] IP-Adressen
\item[3.2] MAC-Adressen
\item[3.3] TCP- und UDP-Ports
\color{medgreen}
\item[3.4] TCP-Protokolle
\item[3.5] Routing
\item[3.6] Netzwerkanalyse
\item[3.7] SSH
\color{red}
\item[3.8] X11
\end{itemize}
\item[\textbf{4}] \textbf{Relationale Datenbanken}
\vspace*{-\smallskipamount}
\item[\textbf{\dots}]
\end{itemize}
\vfilll
\underconstruction
\end{frame}
\setcounter{section}{2}
\section{Kurzeinführung TCP/IP}
\setcounter{subsection}{3}
\subsection{TCP-Protokolle}
\begin{frame}
\showsubsection
\begin{itemize}
\item
\textbf{SMTP}\\
\lstinline[style=cmd]{HELO cassini}\\
\lstinline[style=cmd]{MAIL FROM: <example@example.com>}\\
\lstinline[style=cmd]{RCPT TO: <beispiel@example.de>}\\
\lstinline[style=cmd]{DATA}\\
(E-Mail-Header -- Teil der Nutzdaten)\\
\lstinline[style=cmd]{From: Eddie Example <example@example.com>}\\
\lstinline[style=cmd]{To: Bert Beispiel <beispiel@example.de>}\\
\lstinline[style=cmd]{Subject: Hello, world!}\\
(Leerzeile)\\
\lstinline[style=cmd]{Hi, there!}\\
\lstinline[style=cmd]{.}
% \pause
\smallskip
\item
\textbf{HTTP}\\
\lstinline[style=cmd]{GET / HTTP/1.1}\\
\lstinline[style=cmd]{Host: www.hs-bochum.de}\\
(Leerzeile)
% \begin{onlyenv}<2>
\par\medskip
% URL: Schema://Benutzer:Passwort@Rechner:port/Pfad?Query\#Fragment
% \end{onlyenv}
% \pause
\medskip
\item
Protokolle "`mal eben"' selbst schreiben:
\lstinline[style=cmd]{nc -c} oder \file{inetd}
\end{itemize}
\end{frame}
\subsection{Routing}
\begin{frame}[fragile]
\showsubsection
\begin{itemize}
\item
\lstinline[style=cmd]{ip route} (Linux)\\
\lstinline[style=cmd]{route} (MS-Windows, Unix)\\
\lstinline[style=cmd]{netstat -nr} (MacOS)
% \\[\medskipamount]
% \includegraphics[width=11cm]{../20171026/photo-20171026-162455.jpg}
\end{itemize}
\medskip
\begin{lstlisting}[style=terminal]
# route -n
Kernel-IP-Routentabelle
Ziel Router Genmask [...] Iface
0.0.0.0 192.168.42.1 0.0.0.0 [...] wlan0
169.254.0.0 0.0.0.0 255.255.0.0 [...] wlan0
192.168.42.0 0.0.0.0 255.255.255.0 [...] wlan0
\end{lstlisting}
\bigskip
Netzmaske:\\
Wenn nach Und-Verknüpfung mit IP-Adresse gleich,
\textarrow\ im gleichen Netz
\medskip
\lstinline[style=terminal]{255.255.240.0} ist dasselbe wie
\lstinline[style=terminal]{/20}\\
(20 Bit sind 1; die restlichen 12 Bit sind 0)
\end{frame}
\subsection{Netzwerkanalyse}
\begin{frame}
\showsubsection
\begin{itemize}
\item
\lstinline[style=cmd]{tcpdump}
\item
\lstinline[style=cmd]{wireshark}
\item
\lstinline[style=cmd]{ettercap}
\end{itemize}
\end{frame}
\subsection{SSH}
\begin{frame}
\showsubsection
\begin{itemize}
\item
\lstinline[style=cmd]{SSH <Rechner>}
\item
\lstinline[style=cmd]{-C}: Komprimierung
\item
\lstinline[style=cmd]{-L}: lokalen Port auf Remote-Port umleiten
\item
\lstinline[style=cmd]{-R}: Remote-Port auf lokalen Port umleiten
\end{itemize}
\end{frame}
\subsection{X11}
\begin{frame}
\showsubsection
\begin{itemize}
\item
Grafik-Bildschirm und Eingabegeräte über's Netz
\item
\lstinline[style=cmd]{DISPLAY}-Variable: X-Server: Rechner und Bildschirm
\item
\lstinline[style=cmd]{ssh -X}: X11-Forwarding
\end{itemize}
\end{frame}
\nosectionnonumber{\inserttitle}
\begin{frame}
\shownosectionnonumber
\begin{itemize}
\item[\textbf{1}] \textbf{Einführung}
\hfill\makebox(0,0)[br]{\raisebox{2.25ex}{\url{https://gitlab.cvh-server.de/pgerwinski/dbs}}}%
\item[\textbf{2}] \textbf{Kurzeinführung Unix}
\item[\textbf{3}] \textbf{Kurzeinführung TCP/IP}
\begin{itemize}
\item[3.1] IP-Adressen
\item[3.2] MAC-Adressen
\item[3.3] TCP- und UDP-Ports
\color{medgreen}
\item[3.4] TCP-Protokolle
\item[3.5] Routing
\item[3.6] Netzwerkanalyse
\item[3.7] SSH
\item[3.8] X11
\end{itemize}
\item[\textbf{4}] \textbf{Relationale Datenbanken}
\vspace*{-\smallskipamount}
\item[\textbf{\dots}]
\end{itemize}
\vfilll
\underconstruction
\end{frame}
\end{document}
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