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cti-python-stix2
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add_visitor
Richard Piazza 2018-11-20 10:37:03 -05:00
parent 7f0d6b2400
commit 9cabd9c5d9
2 changed files with 277 additions and 155 deletions
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39
stix2/STIXPatternVisitor.py
View File

@ -1,28 +1,23 @@
import six
from stix2patterns.grammars.STIXPatternParser import TerminalNode
from stix2patterns.grammars.STIXPatternVisitor import STIXPatternVisitor
from antlr4 import CommonTokenStream, InputStream
from stix2patterns.grammars.STIXPatternLexer import STIXPatternLexer
from stix2patterns.grammars.STIXPatternParser import STIXPatternParser
from stix2patterns.validator import STIXPatternErrorListener
import importlib
import inspect
from .patterns import (FollowedByObservationExpression,
IsSubsetComparisonExpression,
IsSupersetComparisonExpression,
StartStopQualifier,
WithinQualifier,
RepeatQualifier,
BasicObjectPathComponent,
ListObjectPathComponent,
StringConstant,
IntegerConstant,
FloatConstant,
HexConstant,
BinaryConstant,
BooleanConstant,
TimestampConstant)
import six
from stix2patterns.grammars.STIXPatternLexer import STIXPatternLexer
from stix2patterns.grammars.STIXPatternParser import (
STIXPatternParser, TerminalNode,
)
from stix2patterns.grammars.STIXPatternVisitor import STIXPatternVisitor
from stix2patterns.validator import STIXPatternErrorListener
from antlr4 import CommonTokenStream, InputStream
from .patterns import (
BasicObjectPathComponent, BinaryConstant, BooleanConstant, FloatConstant,
FollowedByObservationExpression, HexConstant, IntegerConstant,
IsSubsetComparisonExpression, IsSupersetComparisonExpression,
ListObjectPathComponent, RepeatQualifier, StartStopQualifier,
StringConstant, TimestampConstant, WithinQualifier,
)
def collapse_lists(lists):

341
stix2/test/test_pattern_expressions.py
View File

@ -6,39 +6,57 @@ import stix2
def test_create_comparison_expression():
exp = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'",
stix2.HashConstant("aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f", "SHA-256")) # noqa
exp = stix2.EqualityComparisonExpression(
"file:hashes.'SHA-256'",
stix2.HashConstant("aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f", "SHA-256"),
) # noqa
assert str(exp) == "file:hashes.'SHA-256' = 'aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f'"
def test_boolean_expression():
exp1 = stix2.MatchesComparisonExpression("email-message:from_ref.value",
stix2.StringConstant(".+\\@example\\.com$"))
exp2 = stix2.MatchesComparisonExpression("email-message:body_multipart[*].body_raw_ref.name",
stix2.StringConstant("^Final Report.+\\.exe$"))
exp1 = stix2.MatchesComparisonExpression(
"email-message:from_ref.value",
stix2.StringConstant(".+\\@example\\.com$"),
)
exp2 = stix2.MatchesComparisonExpression(
"email-message:body_multipart[*].body_raw_ref.name",
stix2.StringConstant("^Final Report.+\\.exe$"),
)
exp = stix2.AndBooleanExpression([exp1, exp2])
assert str(exp) == "email-message:from_ref.value MATCHES '.+\\\\@example\\\\.com$' AND email-message:body_multipart[*].body_raw_ref.name MATCHES '^Final Report.+\\\\.exe$'" # noqa
def test_boolean_expression_with_parentheses():
exp1 = stix2.MatchesComparisonExpression(stix2.ObjectPath("email-message",
[stix2.ReferenceObjectPathComponent("from_ref"),
stix2.BasicObjectPathComponent("value")]),
stix2.StringConstant(".+\\@example\\.com$"))
exp2 = stix2.MatchesComparisonExpression("email-message:body_multipart[*].body_raw_ref.name",
stix2.StringConstant("^Final Report.+\\.exe$"))
exp1 = stix2.MatchesComparisonExpression(
stix2.ObjectPath(
"email-message",
[
stix2.ReferenceObjectPathComponent("from_ref"),
stix2.BasicObjectPathComponent("value"),
],
),
stix2.StringConstant(".+\\@example\\.com$"),
)
exp2 = stix2.MatchesComparisonExpression(
"email-message:body_multipart[*].body_raw_ref.name",
stix2.StringConstant("^Final Report.+\\.exe$"),
)
exp = stix2.ParentheticalExpression(stix2.AndBooleanExpression([exp1, exp2]))
assert str(exp) == "(email-message:from_ref.value MATCHES '.+\\\\@example\\\\.com$' AND email-message:body_multipart[*].body_raw_ref.name MATCHES '^Final Report.+\\\\.exe$')" # noqa
def test_hash_followed_by_registryKey_expression_python_constant():
hash_exp = stix2.EqualityComparisonExpression("file:hashes.MD5",
stix2.HashConstant("79054025255fb1a26e4bc422aef54eb4", "MD5"))
hash_exp = stix2.EqualityComparisonExpression(
"file:hashes.MD5",
stix2.HashConstant("79054025255fb1a26e4bc422aef54eb4", "MD5"),
)
o_exp1 = stix2.ObservationExpression(hash_exp)
reg_exp = stix2.EqualityComparisonExpression(stix2.ObjectPath("windows-registry-key", ["key"]),
stix2.StringConstant("HKEY_LOCAL_MACHINE\\foo\\bar"))
reg_exp = stix2.EqualityComparisonExpression(
stix2.ObjectPath("windows-registry-key", ["key"]),
stix2.StringConstant("HKEY_LOCAL_MACHINE\\foo\\bar"),
)
o_exp2 = stix2.ObservationExpression(reg_exp)
fb_exp = stix2.FollowedByObservationExpression([o_exp1, o_exp2])
para_exp = stix2.ParentheticalExpression(fb_exp)
@ -48,11 +66,15 @@ def test_hash_followed_by_registryKey_expression_python_constant():
def test_hash_followed_by_registryKey_expression():
hash_exp = stix2.EqualityComparisonExpression("file:hashes.MD5",
stix2.HashConstant("79054025255fb1a26e4bc422aef54eb4", "MD5"))
hash_exp = stix2.EqualityComparisonExpression(
"file:hashes.MD5",
stix2.HashConstant("79054025255fb1a26e4bc422aef54eb4", "MD5"),
)
o_exp1 = stix2.ObservationExpression(hash_exp)
reg_exp = stix2.EqualityComparisonExpression(stix2.ObjectPath("windows-registry-key", ["key"]),
stix2.StringConstant("HKEY_LOCAL_MACHINE\\foo\\bar"))
reg_exp = stix2.EqualityComparisonExpression(
stix2.ObjectPath("windows-registry-key", ["key"]),
stix2.StringConstant("HKEY_LOCAL_MACHINE\\foo\\bar"),
)
o_exp2 = stix2.ObservationExpression(reg_exp)
fb_exp = stix2.FollowedByObservationExpression([o_exp1, o_exp2])
para_exp = stix2.ParentheticalExpression(fb_exp)
@ -62,31 +84,44 @@ def test_hash_followed_by_registryKey_expression():
def test_file_observable_expression():
exp1 = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'",
exp1 = stix2.EqualityComparisonExpression(
"file:hashes.'SHA-256'",
stix2.HashConstant(
"aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f",
'SHA-256'))
'SHA-256',
),
)
exp2 = stix2.EqualityComparisonExpression("file:mime_type", stix2.StringConstant("application/x-pdf"))
bool_exp = stix2.ObservationExpression(stix2.AndBooleanExpression([exp1, exp2]))
assert str(bool_exp) == "[file:hashes.'SHA-256' = 'aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f' AND file:mime_type = 'application/x-pdf']" # noqa
@pytest.mark.parametrize("observation_class, op", [
@pytest.mark.parametrize(
"observation_class, op", [
(stix2.AndObservationExpression, 'AND'),
(stix2.OrObservationExpression, 'OR'),
])
],
)
def test_multiple_file_observable_expression(observation_class, op):
exp1 = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'",
exp1 = stix2.EqualityComparisonExpression(
"file:hashes.'SHA-256'",
stix2.HashConstant(
"bf07a7fbb825fc0aae7bf4a1177b2b31fcf8a3feeaf7092761e18c859ee52a9c",
'SHA-256'))
exp2 = stix2.EqualityComparisonExpression("file:hashes.MD5",
stix2.HashConstant("cead3f77f6cda6ec00f57d76c9a6879f", "MD5"))
'SHA-256',
),
)
exp2 = stix2.EqualityComparisonExpression(
"file:hashes.MD5",
stix2.HashConstant("cead3f77f6cda6ec00f57d76c9a6879f", "MD5"),
)
bool1_exp = stix2.OrBooleanExpression([exp1, exp2])
exp3 = stix2.EqualityComparisonExpression("file:hashes.'SHA-256'",
exp3 = stix2.EqualityComparisonExpression(
"file:hashes.'SHA-256'",
stix2.HashConstant(
"aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f",
'SHA-256'))
'SHA-256',
),
)
op1_exp = stix2.ObservationExpression(bool1_exp)
op2_exp = stix2.ObservationExpression(exp3)
exp = observation_class([op1_exp, op2_exp])
@ -96,19 +131,29 @@ def test_multiple_file_observable_expression(observation_class, op):
def test_root_types():
ast = stix2.ObservationExpression(
stix2.AndBooleanExpression(
[stix2.ParentheticalExpression(
[
stix2.ParentheticalExpression(
stix2.OrBooleanExpression([
stix2.EqualityComparisonExpression("a:b", stix2.StringConstant("1")),
stix2.EqualityComparisonExpression("b:c", stix2.StringConstant("2"))])),
stix2.EqualityComparisonExpression(u"b:d", stix2.StringConstant("3"))]))
stix2.EqualityComparisonExpression("b:c", stix2.StringConstant("2")),
]),
),
stix2.EqualityComparisonExpression(u"b:d", stix2.StringConstant("3")),
],
),
)
assert str(ast) == "[(a:b = '1' OR b:c = '2') AND b:d = '3']"
def test_artifact_payload():
exp1 = stix2.EqualityComparisonExpression("artifact:mime_type",
"application/vnd.tcpdump.pcap")
exp2 = stix2.MatchesComparisonExpression("artifact:payload_bin",
stix2.StringConstant("\\xd4\\xc3\\xb2\\xa1\\x02\\x00\\x04\\x00"))
exp1 = stix2.EqualityComparisonExpression(
"artifact:mime_type",
"application/vnd.tcpdump.pcap",
)
exp2 = stix2.MatchesComparisonExpression(
"artifact:payload_bin",
stix2.StringConstant("\\xd4\\xc3\\xb2\\xa1\\x02\\x00\\x04\\x00"),
)
and_exp = stix2.ObservationExpression(stix2.AndBooleanExpression([exp1, exp2]))
assert str(and_exp) == "[artifact:mime_type = 'application/vnd.tcpdump.pcap' AND artifact:payload_bin MATCHES '\\\\xd4\\\\xc3\\\\xb2\\\\xa1\\\\x02\\\\x00\\\\x04\\\\x00']" # noqa
@ -120,8 +165,10 @@ def test_greater_than_python_constant():
def test_greater_than():
exp1 = stix2.GreaterThanComparisonExpression("file:extensions.windows-pebinary-ext.sections[*].entropy",
stix2.FloatConstant(7.0))
exp1 = stix2.GreaterThanComparisonExpression(
"file:extensions.windows-pebinary-ext.sections[*].entropy",
stix2.FloatConstant(7.0),
)
exp = stix2.ObservationExpression(exp1)
assert str(exp) == "[file:extensions.windows-pebinary-ext.sections[*].entropy > 7.0]"
@ -132,73 +179,123 @@ def test_less_than():
def test_greater_than_or_equal():
exp = stix2.GreaterThanEqualComparisonExpression("file:size",
1024)
exp = stix2.GreaterThanEqualComparisonExpression(
"file:size",
1024,
)
assert str(exp) == "file:size >= 1024"
def test_less_than_or_equal():
exp = stix2.LessThanEqualComparisonExpression("file:size",
1024)
exp = stix2.LessThanEqualComparisonExpression(
"file:size",
1024,
)
assert str(exp) == "file:size <= 1024"
def test_not():
exp = stix2.LessThanComparisonExpression("file:size",
exp = stix2.LessThanComparisonExpression(
"file:size",
1024,
negated=True)
negated=True,
)
assert str(exp) == "file:size NOT < 1024"
def test_and_observable_expression():
exp1 = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:account_type",
"unix"),
stix2.EqualityComparisonExpression("user-account:user_id",
stix2.StringConstant("1007")),
stix2.EqualityComparisonExpression("user-account:account_login",
"Peter")])
exp2 = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:account_type",
"unix"),
stix2.EqualityComparisonExpression("user-account:user_id",
stix2.StringConstant("1008")),
stix2.EqualityComparisonExpression("user-account:account_login",
"Paul")])
exp3 = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:account_type",
"unix"),
stix2.EqualityComparisonExpression("user-account:user_id",
stix2.StringConstant("1009")),
stix2.EqualityComparisonExpression("user-account:account_login",
"Mary")])
exp = stix2.AndObservationExpression([stix2.ObservationExpression(exp1),
exp1 = stix2.AndBooleanExpression([
stix2.EqualityComparisonExpression(
"user-account:account_type",
"unix",
),
stix2.EqualityComparisonExpression(
"user-account:user_id",
stix2.StringConstant("1007"),
),
stix2.EqualityComparisonExpression(
"user-account:account_login",
"Peter",
),
])
exp2 = stix2.AndBooleanExpression([
stix2.EqualityComparisonExpression(
"user-account:account_type",
"unix",
),
stix2.EqualityComparisonExpression(
"user-account:user_id",
stix2.StringConstant("1008"),
),
stix2.EqualityComparisonExpression(
"user-account:account_login",
"Paul",
),
])
exp3 = stix2.AndBooleanExpression([
stix2.EqualityComparisonExpression(
"user-account:account_type",
"unix",
),
stix2.EqualityComparisonExpression(
"user-account:user_id",
stix2.StringConstant("1009"),
),
stix2.EqualityComparisonExpression(
"user-account:account_login",
"Mary",
),
])
exp = stix2.AndObservationExpression([
stix2.ObservationExpression(exp1),
stix2.ObservationExpression(exp2),
stix2.ObservationExpression(exp3)])
stix2.ObservationExpression(exp3),
])
assert str(exp) == "[user-account:account_type = 'unix' AND user-account:user_id = '1007' AND user-account:account_login = 'Peter'] AND [user-account:account_type = 'unix' AND user-account:user_id = '1008' AND user-account:account_login = 'Paul'] AND [user-account:account_type = 'unix' AND user-account:user_id = '1009' AND user-account:account_login = 'Mary']" # noqa
def test_invalid_and_observable_expression():
with pytest.raises(ValueError) as excinfo:
stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("user-account:display_name",
"admin"),
stix2.EqualityComparisonExpression("email-addr:display_name",
stix2.StringConstant("admin"))])
stix2.AndBooleanExpression([
stix2.EqualityComparisonExpression(
"user-account:display_name",
"admin",
),
stix2.EqualityComparisonExpression(
"email-addr:display_name",
stix2.StringConstant("admin"),
),
])
assert "All operands to an 'AND' expression must have the same object type" in str(excinfo)
def test_hex():
exp_and = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("file:mime_type",
"image/bmp"),
stix2.EqualityComparisonExpression("file:magic_number_hex",
stix2.HexConstant("ffd8"))])
exp_and = stix2.AndBooleanExpression([
stix2.EqualityComparisonExpression(
"file:mime_type",
"image/bmp",
),
stix2.EqualityComparisonExpression(
"file:magic_number_hex",
stix2.HexConstant("ffd8"),
),
])
exp = stix2.ObservationExpression(exp_and)
assert str(exp) == "[file:mime_type = 'image/bmp' AND file:magic_number_hex = h'ffd8']"
def test_multiple_qualifiers():
exp_and = stix2.AndBooleanExpression([stix2.EqualityComparisonExpression("network-traffic:dst_ref.type",
"domain-name"),
stix2.EqualityComparisonExpression("network-traffic:dst_ref.value",
"example.com")])
exp_and = stix2.AndBooleanExpression([
stix2.EqualityComparisonExpression(
"network-traffic:dst_ref.type",
"domain-name",
),
stix2.EqualityComparisonExpression(
"network-traffic:dst_ref.value",
"example.com",
),
])
exp_ob = stix2.ObservationExpression(exp_and)
qual_rep = stix2.RepeatQualifier(5)
qual_within = stix2.WithinQualifier(stix2.IntegerConstant(1800))
@ -207,8 +304,10 @@ def test_multiple_qualifiers():
def test_set_op():
exp = stix2.ObservationExpression(stix2.IsSubsetComparisonExpression("network-traffic:dst_ref.value",
"2001:0db8:dead:beef:0000:0000:0000:0000/64"))
exp = stix2.ObservationExpression(stix2.IsSubsetComparisonExpression(
"network-traffic:dst_ref.value",
"2001:0db8:dead:beef:0000:0000:0000:0000/64",
))
assert str(exp) == "[network-traffic:dst_ref.value ISSUBSET '2001:0db8:dead:beef:0000:0000:0000:0000/64']"
@ -218,35 +317,45 @@ def test_timestamp():
def test_boolean():
exp = stix2.EqualityComparisonExpression("email-message:is_multipart",
True)
exp = stix2.EqualityComparisonExpression(
"email-message:is_multipart",
True,
)
assert str(exp) == "email-message:is_multipart = true"
def test_binary():
const = stix2.BinaryConstant("dGhpcyBpcyBhIHRlc3Q=")
exp = stix2.EqualityComparisonExpression("artifact:payload_bin",
const)
exp = stix2.EqualityComparisonExpression(
"artifact:payload_bin",
const,
)
assert str(exp) == "artifact:payload_bin = b'dGhpcyBpcyBhIHRlc3Q='"
def test_list():
exp = stix2.InComparisonExpression("process:name",
['proccy', 'proximus', 'badproc'])
exp = stix2.InComparisonExpression(
"process:name",
['proccy', 'proximus', 'badproc'],
)
assert str(exp) == "process:name IN ('proccy', 'proximus', 'badproc')"
def test_list2():
# alternate way to construct an "IN" Comparison Expression
exp = stix2.EqualityComparisonExpression("process:name",
['proccy', 'proximus', 'badproc'])
exp = stix2.EqualityComparisonExpression(
"process:name",
['proccy', 'proximus', 'badproc'],
)
assert str(exp) == "process:name IN ('proccy', 'proximus', 'badproc')"
def test_invalid_constant_type():
with pytest.raises(ValueError) as excinfo:
stix2.EqualityComparisonExpression("artifact:payload_bin",
{'foo': 'bar'})
stix2.EqualityComparisonExpression(
"artifact:payload_bin",
{'foo': 'bar'},
)
assert 'Unable to create a constant' in str(excinfo)
@ -268,7 +377,8 @@ def test_invalid_float_constant():
assert 'must be a float' in str(excinfo)
@pytest.mark.parametrize("data, result", [
@pytest.mark.parametrize(
"data, result", [
(True, True),
(False, False),
('True', True),
@ -281,7 +391,8 @@ def test_invalid_float_constant():
('F', False),
(1, True),
(0, False),
])
],
)
def test_boolean_constant(data, result):
boolean = stix2.BooleanConstant(data)
assert boolean.value == result
@ -293,10 +404,12 @@ def test_invalid_boolean_constant():
assert 'must be a boolean' in str(excinfo)
@pytest.mark.parametrize("hashtype, data", [
@pytest.mark.parametrize(
"hashtype, data", [
('MD5', 'zzz'),
('ssdeep', 'zzz=='),
])
],
)
def test_invalid_hash_constant(hashtype, data):
with pytest.raises(ValueError) as excinfo:
stix2.HashConstant(data, hashtype)
@ -316,20 +429,26 @@ def test_invalid_binary_constant():
def test_escape_quotes_and_backslashes():
exp = stix2.MatchesComparisonExpression("file:name",
"^Final Report.+\\.exe$")
exp = stix2.MatchesComparisonExpression(
"file:name",
"^Final Report.+\\.exe$",
)
assert str(exp) == "file:name MATCHES '^Final Report.+\\\\.exe$'"
def test_like():
exp = stix2.LikeComparisonExpression("directory:path",
"C:\\Windows\\%\\foo")
exp = stix2.LikeComparisonExpression(
"directory:path",
"C:\\Windows\\%\\foo",
)
assert str(exp) == "directory:path LIKE 'C:\\\\Windows\\\\%\\\\foo'"
def test_issuperset():
exp = stix2.IsSupersetComparisonExpression("ipv4-addr:value",
"198.51.100.0/24")
exp = stix2.IsSupersetComparisonExpression(
"ipv4-addr:value",
"198.51.100.0/24",
)
assert str(exp) == "ipv4-addr:value ISSUPERSET '198.51.100.0/24'"
@ -351,24 +470,32 @@ def test_invalid_within_qualifier():
def test_startstop_qualifier():
qual = stix2.StartStopQualifier(stix2.TimestampConstant('2016-06-01T00:00:00Z'),
datetime.datetime(2017, 3, 12, 8, 30, 0))
qual = stix2.StartStopQualifier(
stix2.TimestampConstant('2016-06-01T00:00:00Z'),
datetime.datetime(2017, 3, 12, 8, 30, 0),
)
assert str(qual) == "START t'2016-06-01T00:00:00Z' STOP t'2017-03-12T08:30:00Z'"
qual2 = stix2.StartStopQualifier(datetime.date(2016, 6, 1),
stix2.TimestampConstant('2016-07-01T00:00:00Z'))
qual2 = stix2.StartStopQualifier(
datetime.date(2016, 6, 1),
stix2.TimestampConstant('2016-07-01T00:00:00Z'),
)
assert str(qual2) == "START t'2016-06-01T00:00:00Z' STOP t'2016-07-01T00:00:00Z'"
def test_invalid_startstop_qualifier():
with pytest.raises(ValueError) as excinfo:
stix2.StartStopQualifier('foo',
stix2.TimestampConstant('2016-06-01T00:00:00Z'))
stix2.StartStopQualifier(
'foo',
stix2.TimestampConstant('2016-06-01T00:00:00Z'),
)
assert 'is not a valid argument for a Start/Stop Qualifier' in str(excinfo)
with pytest.raises(ValueError) as excinfo:
stix2.StartStopQualifier(datetime.date(2016, 6, 1),
'foo')
stix2.StartStopQualifier(
datetime.date(2016, 6, 1),
'foo',
)
assert 'is not a valid argument for a Start/Stop Qualifier' in str(excinfo)