Difference between revisions of "OWASP Orizon Project XML"

From OWASP
Jump to: navigation, search
(Design check)
(Design check)
Line 39: Line 39:
 
=== Classes ===
 
=== Classes ===
  
   <
+
   <design
   </>
+
        subj="class"
 +
        name=<i>ingored</i>
 +
        verb=[count|has_scope]
 +
        value=''the value being checked''
 +
  &gt;
 +
   &lt;/design&gt;
  
 
== keyword_check, about keyword specific checks ==
 
== keyword_check, about keyword specific checks ==

Revision as of 17:09, 7 December 2008

Contents

The Orizon check XML schema

Security checks can be divided in:

  • design_check
  • keyword_check
  • execution_check
  • stats_check

Statistics check

The stats check XML schema has been changed from version 1.0, so this applies starting from version 1.1 and later

<stats
    subj=[code | comment | complexity]
    verb=[lt | gt | le | ge | ne | eq | ratio]
    [ direct_object= [loc | loC] ]
    [modifier = "percentage"]
    value=numeric value
  />

where:

  • Subject can be one of the following:
    • code: line of code
    • comment: line of comments
    • complexity: ciclomatic complexity index
  • verb is the boolean comparison operator between the subject and the value:
    • lt: lesser than
    • gt: grater than
    • le: lesser or equal than
    • ge: greater or equal than
    • ne: not equal than
    • eq: equal than
    • ratio: indicates the ratio subj versus direct_object

Design check

 This is a work in progress section. Actually I'm collecting all the security checks coming from other tools and trying to figure it out the XML schema to use to describe security checks.
 thesp0nge, 07.12.2008

Classes

 <design
       subj="class"
       name=ingored
       verb=[count|has_scope]
       value=the value being checked
 >
 </design>

keyword_check, about keyword specific checks

  <keyword
    name=keyword name
  />

execution_check: extra care must be taken for parameter in this desing...

  <exec
    caller_class=a class name
    caller_method=a method name
  />

The Orizon Input file XML schema

Orizon 1.0 will bring 3 new subsystems in Jericho engine:

  • local analisys (control flow graph)
  • global analisys (call graph)
  • taint propagation analisys (data graph)

Each of this subsystems will use a different input file provided by the translator, so each source file will be translated in 3 different XML files with different schema of course.

Local analisys

Global analisys

Taint propagation analisys

This subsystem is devoted to analyze variable content and how data is managed by the application.

Here is the schema to be used to describe a generic operation over a variable or a socket or a generic I/O operation.

 <taint
      subj="[variable|socket|sql|file]"
      name="the variable name"
      type="the variable data type"
      verb="[created|modified|deleted|read_data|write_data]"
      constant="[yes|no]"
      must_reduce="[yes|no]"
      value"the value being used to fill the variable"
 >
      expression to be reduced...
 </taint>

Here there are some example to understand better how instructions over variable, will be translated to XML.

    • Variable declaration

To better describe variable declaration we must discriminate from simple variable rather than complex objects in OO programming languages.

If we need to declare a brand new integer value,

  int a;

we will obtain

  <taint subj="variable" name="a" type="int" verb="created" constant="" value="" must_reduce="no" />

If we choose to create a new variable with a init value,

  int b = 3;

we will obtain

  <taint subj="variable" name="b" type="int" verb="created" constant="" value="3" must_reduce="no" />

Now lets create an object rather than a simple variable.

  String c = new String("A new string");

The correspondent XML will be

  <taint subj="variable" name="c" type="String" verb="created" constant="" value="A new string" must_reduce="no" />

What happens if some complex constructor call is issued

  String d = new String((new Integer(3)).toString());

This example is quite odd, but it's a common practice to have very complex object constructor calls.

  <taint subj="variable" name="d" type="String" verb="created" constant="" value="" must_reduce="yes">
      <taint subj="variable" name="dyno1" type="Integer" verb="created" value="3" must_reduce="no">
      <call variable="dyno1" method="toString()">
            <result type="String">3</result>
      </call>  
  </taint>
    • Generic non constant assignment

Let a be an integer variable. We want to stuff volatile value of '5' into it...

  a = 5;

it becomes

  <taint subj="variable" name="a" verb="modified" constant="no" value="5" />