OWASP Orizon Project XML

The Orizon check XML schema

A check contained in a safe coding recipe, follows this schema:

  <check 
     id=check identifier code 
     severity=[info | warning | error] 
     impact=[low | medium | high | critical | panic ]
     description=a short description for this check
     positive_fail=[yes | no]
  > 
     [method_check | class_check | attribute_check | compare_check |   variable_check | source_check]
  </check>

... some ideas ...

Security checks can be divided in:

• design_check
• keyword_check
• execution_check

Design check

Design checks are about source file design (how many class are contained in a source? how many methods? what is the scope of the method A?).

source code statistics

  <design
    subj="stats"
    name=[loc | loC]
    verb=[lt | gt | le | ge | ne | eq | ratio]
    [ direct_object= [loc | loC] ]
    value=numeric value
  />

where:

• name is the statistics name and can be one of the following:
  • loc: line of code
  • loC: line of Comment

• 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 
    subj=[class|field|attribute]
    name=the subject name when appliable
    verb=[contains|count|has_scope]
    value=the value being checked
  />

  <design 
    subj="class"
    verb=[extends|implements]
    value=the value being checked
  />

• 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.

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"
      verb="[created|modified|deleted|read_data|write_data]"
      constant="[yes|no]"
      value"the value being used to fill the variable"
 />

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

• • 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">