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from common import RostTestClass
from pychrysalide.analysis.contents import MemoryContent
class TestRostFunctions(RostTestClass):
"""TestCases for the core functions of ROST."""
# Core
# ====
def testDatasize(self):
"""Handle the size of the provided data."""
cnt = MemoryContent(b'\x01\x02\x03\x04')
cases = [
'datasize == 4',
'uint16(0) == 0x201 and uint16(datasize - 2) == 0x0403',
]
for c in cases:
rule = '''
rule test {
condition:
%s
}
''' % c
self.check_rule_success(rule, cnt)
# Modules
# =======
def testConsole(self):
"""Ensure logging always returns true."""
rule = '''
rule test {
condition:
console.log()
}
'''
self.check_rule_success(rule)
def testMagic(self):
"""Scan text content with the Magic module."""
cnt = MemoryContent(b'aaaa')
cases = [
[ 'type', 'ASCII text, with no line terminators' ],
[ 'mime_encoding', 'us-ascii' ],
[ 'mime_type', 'text/plain' ],
]
for target, expected in cases:
rule = '''
rule test {
condition:
magic.%s() == "%s"
}
''' % (target, expected)
self.check_rule_success(rule, cnt)
def testMathOperations(self):
"""Perform math operations with core functions."""
rule = '''
rule test {
condition:
math.to_string(123) == "123"
and math.to_string(291, 16) == "0x123"
and math.to_string(-83, 8) == "-0123"
and math.to_string(123, 2) == "0b1111011"
}
'''
self.check_rule_success(rule)
def testStringOperations(self):
"""Perform string operations with core functions."""
rule = '''
rule test {
condition:
string.lower("ABCd") == "abcd" and string.lower("123abc") == "123abc"
}
'''
self.check_rule_success(rule)
rule = '''
rule test {
condition:
string.upper("abcD") == "ABCD" and string.upper("123ABC") == "123ABC"
}
'''
self.check_rule_success(rule)
rule = '''
rule test {
condition:
string.to_int("123") == 123
and string.to_int("123", 16) == 291
and string.to_int("0x123") == 291
and string.to_int("-0123") == -83
}
'''
self.check_rule_success(rule)
rule = r'''
rule test {
condition:
"A\x00B\x00C\x00D\x00" endswith string.wide("CD")
and "A\x00B\x00C\x00D\x00" contains string.wide("BC")
}
'''
self.check_rule_success(rule)
def testTime(self):
"""Check current time."""
# Cf. https://www.epochconverter.com/
rule = '''
rule test {
condition:
time.make(2023, 8, 5, 22, 8, 41) == 0x64cec869
}
'''
self.check_rule_success(rule)
rule = '''
rule test {
condition:
time.now() >= 0x64cec874 and time.now() <= time.now()
}
'''
self.check_rule_success(rule)
|
