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import json
from common import RostTestClass
from pychrysalide.analysis.contents import MemoryContent
class TestRostGrammar(RostTestClass):
"""TestCases for the ROST grammar."""
def testRelationalExpressions(self):
"""Build expressions with relational comparisons."""
cases = [
# Regular
[ '-1', '<=', '2', True ],
[ '-1', '<=', '2', True ],
[ '"aaa"', '==', '"aaa"', True ],
[ '"aaa"', '<', '"aaaa"', True ],
[ '""', '<', '"aaaa"', True ],
# Cast
[ 'false', '==', '0', True ],
[ 'false', '==', '1', False ],
[ 'true', '!=', '0', True ],
[ '1', '==', 'true', True ],
[ 'false', '==', '()', True ],
[ 'true', '==', '(0,)', True ],
]
for op1, kwd, op2, expected in cases:
rule = '''
rule test {
condition:
%s %s %s
}
''' % (op1, kwd, op2)
if expected:
self.check_rule_success(rule)
else:
self.check_rule_failure(rule)
def testLogicalOperations(self):
"""Evaluate some logical operations."""
cases = [
[ 'true and false', False ],
[ 'false or false', False ],
[ 'true and true or false', True ],
[ 'false or true and false', False ],
[ '1 or false', True ],
]
for cond, expected in cases:
rule = '''
rule test {
condition:
%s
}
''' % (cond)
if expected:
self.check_rule_success(rule)
else:
self.check_rule_failure(rule)
def testArithmeticOperations(self):
"""Evaluate some arithmetic operations."""
cases = [
# Clever
'1 + 2 == 3',
'10 + -3 == 7',
'-3 + 10 == 7',
'-10 - 1 < 0',
'-10 - 1 == -11',
'(-10 - 1) == -11',
'(-1 - -10) == 9',
'-2 * -3 == 6',
'-2 * 3 == -6',
# Legacy
'1 + 4 * 3 + 2 == 15',
'(1 + 4) * 3 + 2 == 17',
'1 + 4 * (3 + 2) == 21',
'(1 + 4) * (3 + 2) == 25',
]
for c in cases:
rule = '''
rule test {
condition:
%s
}
''' % (c)
self.check_rule_success(rule)
def testBasicStringsOperations(self):
"""Build expressions with basic strings operations."""
cases = [
# Clever
[ '123---456', 'contains', '---', True ],
[ '123---456', 'contains', 'xxx', False ],
[ '---123---456', 'startswith', '---', True ],
[ '---123---456', 'startswith', 'xxx', False ],
[ '123---456---', 'endswith', '---', True ],
[ '123---456---', 'endswith', 'xxx', False ],
[ 'AAA---BBB', 'icontains', 'aaa', True ],
[ 'AAA---BBB', 'icontains', 'xxx', False ],
[ 'AAA---BBB', 'istartswith', 'aAa', True ],
[ 'AAA---BBB', 'istartswith', 'xxx', False ],
[ 'AAA---BBB', 'iendswith', 'bBb', True ],
[ 'AAA---BBB', 'iendswith', 'xxx', False ],
[ 'AzertY', 'iequals', 'AZERTY', True ],
[ 'AzertY', 'iequals', 'AZERTY-', False ],
# Legacy
[ '123\t456', 'contains', '\t', True ],
[ '123-456', 'startswith', '1', True ],
[ '123-456', 'startswith', '1234', False ],
[ '123-456', 'endswith', '6', True ],
[ '123-456', 'endswith', '3456', False ],
]
for op1, kwd, op2, expected in cases:
rule = '''
rule test {
condition:
"%s" %s "%s"
}
''' % (op1, kwd, op2)
if expected:
self.check_rule_success(rule)
else:
self.check_rule_failure(rule)
def testSizeUnits(self):
"""Evaluate size units."""
cases = [
'1KB == 1024',
'2MB == 2 * 1024 * 1024',
'4Kb == (4 * 1024)',
'1KB <= 1024 and 1024 < 1MB',
]
for c in cases:
rule = '''
rule test {
condition:
%s
}
''' % (c)
self.check_rule_success(rule)
def testPrivateRules(self):
"""Ensure private rules remain silent."""
for private in [ True, False ]:
for state in [ True, False ]:
rule = '''
%srule silent {
condition:
%s
}
rule test {
condition:
silent
}
''' % ('private ' if private else '', 'true' if state else 'false')
scanner, ctx = self._validate_rule_result(rule, self._empty_content, state)
data = scanner.convert_to_json(ctx)
jdata = json.loads(data)
# Exemple :
#
# [{'bytes_patterns': [], 'matched': True, 'name': 'test'},
# {'bytes_patterns': [], 'matched': True, 'name': 'silent'}]
found = len([ j['name'] for j in jdata if j['name'] == 'silent' ]) > 0
self.assertTrue(private ^ found)
def testGlobalRules(self):
"""Take global rules into account."""
for glob_state in [ True, False ]:
for state in [ True, False ]:
rule = '''
%srule silent {
condition:
%s
}
rule test {
condition:
true
}
''' % ('global ' if glob_state else '', 'true' if state else 'false')
expected = not(glob_state) or state
if expected:
self.check_rule_success(rule)
else:
self.check_rule_failure(rule)
def testMatchCount(self):
"""Ensure match count provides expected values."""
cnt = MemoryContent(b'\x01\x02\x02\x03\x03\x03')
rule = '''
rule test {
bytes:
$int_01 = "\x01"
$int_02 = "\x02"
$int_03 = "\x03"
condition:
#int_01 == count($int_01) and #int_01 == 1
and #int_02 == count($int_02) and #int_02 == 2
and #int_03 == count($int_03) and #int_03 == 3
and #int_0* == count($int_0*) and #int_0* == 6
}
'''
self.check_rule_success(rule, cnt)
# TODO : test <haystack> matches <regex>
|
