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\section*{Coursework for 7CCSMSEN}

This coursework is worth 10\% and is due on 1 December at 16:00. You
are asked to fill in the access control matrix below giving the
correct access rights. You have to submit your answers at KEATS. You
can submit your answers in a txt-file or as pdf.


\subsubsection*{Disclaimer}

It should be understood that the work you submit represents your
\textbf{own} effort! You are not supposed to work in groups and have
not copied any solution from anyone else.\bigskip


\subsection*{Task}

A Unix directory might look as follows:

\begin{center}
\begin{verbatim}
$ ls -ld . * */*
drwxr-xr-x 1 ping staff     32768 Apr  2 2010 .
-rw----r-- 1 ping students  31359 Jul 24 2011 manual.txt
-r--rw--w- 1 bob  students   4359 Jul 24 2011 report.txt
-rwsr--r-x 1 bob  students 141359 Jun  1 2013 microedit
dr--r-xr-x 1 bob  staff     32768 Jul 23 2011 src
-rw-r--r-- 1 bob  staff     81359 Feb 28 2012 src/code.c
-r--rw---- 1 emma students    959 Jan 23 2012 src/code.h
\end{verbatim}
\end{center}

\noindent
with group memberships assigned as follows:
\begin{center}
\begin{tabular}{ll}
Members of group staff: & \texttt{ping}, \texttt{bob}, \texttt{emma}\\ 
Members of group students: & \texttt{emma}\\
\end{tabular}
\end{center}

\noindent
The file \texttt{microedit} is a text editor, which allows its users
to open, edit and save files. Note carefully that microedit has set
its \textbf{setuid bit}.  Fill in the access control matrix below
that shows for each of the above five files, whether \texttt{ping},
\texttt{bob}, or \texttt{emma} are able to read (R) or replace (W) its
contents using the editor microedit.\bigskip

\begin{center}
\def\arraystretch{1.5}  
\begin{tabular}{r|c|c|c|c|c}
        & manual.txt & report.txt & microedit & src/code.c & src/code.h \\\hline
ping & & & & &\\\hline
bob & & & & &\\\hline
emma   & & & & &\\
\end{tabular}
\end{center}\bigskip

\noindent
For help about how to fill in the access control matrix, see additional hints
uploaded to KEATS.
\end{document}

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