Reference no: EM13686592
Given the following command for the HRU Access Control Matrix model:
command do-something(sub0; sub1; o)
if f in a[sub0; sub1] and m in a[sub1; sub0]
then
createobject o
end
1. Given the following matrix, show the result (modified matrix) after executing/ calling the commanddo-something(A; B;Obj5)
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Obj1
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Obj2
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Obj3
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Obj4
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...
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A
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B
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C
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. . .
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A
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r
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rw
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rw
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rwx
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...
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m
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f
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B
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w
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w
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wx
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...
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m
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C
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w
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r
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r
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r
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...
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f
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. . .
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...
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Where (r: read, w: write, x: execute, m: modify, f: function) and sub stands for subject, A,B,C are subjects, and Obj stands for Objects
do-something(A;B;Obj5) is a call to the command with the arguments A,B,Obj5
2. Using the syntax in Section 2.3. Write a command delete_object(sub1,sub1) that will delete any occurrences of sub1 if sub1has the right m with itself
3. How will the matrix above result if we execute the command in question 2 for each subject. Hint: it will only succeed in one occurrence
4. Suppose we have a security policy that enforces integrity to its maximum. What needs to be done to the matrix above for enforcing this policy? (hint: do not redo the matrix. Your answer should focus on the rights )
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