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% ----------------------------
\subsubsection{Linux Security Modules}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Linux Security Modules}
\begin{itemize}
\item Problem: Malware, Exploits
\item Solution: Mandatory Access Control
\begin{itemize}
\item Categories: Subjects and Objects
\item systemwide, static rule set
\item Context sensitive Resource Access
\end{itemize}
\item Implementation
\begin{itemize}
\item SE-Linux
\item AppArmor
\item SMACK
\item Tomoyo
\end{itemize}
\end{itemize}
\end{frame}
% ----------------------------
\subsubsection{Terms}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Domain}
\begin{figure}[h]
\centering
\includegraphics[width=8cm]{images/mac_terms.png}
\end{figure}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Domain}
\begin{itemize}
\item Domain transition for each starting Process
\item Default: Inherit previous Domain
\item Note: Domains are unique
\end{itemize}
\begin{beamerboxesrounded}[shadow=true]{Example:}
\begin{small}
\begin{verbatim}
<kernel> /sbin/init /etc/rc.d/rcS /usr/local/bin/myappl
<kernel> /sbin/init /etc/rc.d/rcS /usr/bin/opensshd \
/bin/bin/bash /usr/local/bin/myappl
\end{verbatim}
\end{small}
\end{beamerboxesrounded}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Domain Transition Management}
\begin{itemize}
\item Control Domain Transition Behavior
\item Syntax: \\
\begin{verbatim}
<directive> <domain> from <domain>
\end{verbatim}
\item Directives:
\begin{itemize}
\item initialize\_domain / no\_initialize\_domain
\item keep\_domain / no\_keep\_domain
\end{itemize}
\end{itemize}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Profile}
\begin{itemize}
\item Profiles define Domain restriction behavior
\item Profile Relation to Domain: n..m
\item Up to 255 Profiles
\item Profile Modes:
\begin{itemize}
\item disabled
\item learning
\item permissive
\item enforcing
\end{itemize}
\item Logging
\end{itemize}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Policy}
\begin{itemize}
\item Policies describe Domain restrictions
\item Policy for each Domain
\item Directives:
\begin{itemize}
\item file (read, write, execute, append, chown, chgrp, create, mkfifo, \dots)
\item misc env
\item network inet (stream, dgram, raw)
\item network unix (stream, dgram, seqpacket)
\end{itemize}
\end{itemize}
\end{frame}
% ----------------------------
\subsubsection{Examples}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Example I}
\begin{beamerboxesrounded}[shadow=true]{profile.conf:}
\begin{tiny}
\begin{verbatim}
PROFILE_VERSION=20110903
0-COMMENT=-----Disabled Mode-----
0-PREFERENCE={ max_audit_log=1024 max_learning_entry=2048 }
0-CONFIG={ mode=disabled grant_log=no reject_log=yes }
1-COMMENT=-----Learning Mode-----
1-PREFERENCE={ max_audit_log=1024 max_learning_entry=2048 }
1-CONFIG={ mode=learning grant_log=no reject_log=yes }
2-COMMENT=-----Permissive Mode-----
2-PREFERENCE={ max_audit_log=1024 max_learning_entry=2048 }
2-CONFIG={ mode=permissive grant_log=no reject_log=yes }
3-COMMENT=-----Enforcing Mode-----
3-PREFERENCE={ max_audit_log=1024 max_learning_entry=2048 }
3-CONFIG={ mode=enforcing grant_log=no reject_log=yes }
4-COMMENT=-----Permissive Mode File-only -----
4-PREFERENCE={ max_audit_log=1024 max_learning_entry=2048 }
4-CONFIG::file={ mode=permissive grant_log=no reject_log=yes }
4-CONFIG::file::execute={ mode=disabled grant_log=no reject_log=no }
\end{verbatim}
\end{tiny}
\end{beamerboxesrounded}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Example II}
\begin{beamerboxesrounded}[shadow=true]{exception\_policy.conf:}
\begin{tiny}
\begin{verbatim}
initialize_domain /sbin/ldconfig from any
keep_domain any from /sbin/ldconfig
path_group ANY_PATHNAME /
path_group ANY_PATHNAME /\*
path_group ANY_PATHNAME /\{\*\}/
path_group ANY_PATHNAME /\{\*\}/\*
path_group ANY_PATHNAME \*:/
path_group ANY_PATHNAME \*:/\*
path_group ANY_PATHNAME \*:/\{\*\}/
path_group ANY_PATHNAME \*:/\{\*\}/\*
path_group ANY_PATHNAME \*:[\$]
path_group ANY_PATHNAME socket:[family=\$:type=\$:protocol=\$]
path_group ANY_DIRECTORY /
path_group ANY_DIRECTORY /\{\*\}/
path_group ANY_DIRECTORY \*:/
path_group ANY_DIRECTORY \*:/\{\*\}/
acl_group 1 file read/getattr @ANY_DIRECTORY
acl_group 1 file read/getattr @ANY_PATHNAME
\end{verbatim}
\end{tiny}
\end{beamerboxesrounded}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Example III}
\begin{beamerboxesrounded}[shadow=true]{profile.conf:}
\begin{tiny}
\begin{verbatim}
<kernel>
use_profile 4
use_group 1
<kernel> /sbin/ldconfig
use_profile 4
use_group 1
file create /etc/ld.so.cache~ 0600
file write /etc/ld.so.cache~
file chmod /etc/ld.so.cache~ 0644
file rename /etc/ld.so.cache~ /etc/ld.so.cache
\end{verbatim}
\end{tiny}
\end{beamerboxesrounded}
\end{frame}
% ----------------------------
\subsubsection{Tools}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Tools}
\begin{itemize}
\item tomoyo-editpolicy
\item tomoyo-selectpolicy
\item tomoyo-patternize
\item tomoyo-diffpolicy
\item tomoyo-sortpolicy
\item tomoyo-loadpolicy
\end{itemize}
\end{frame}
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