security-and-privacy/mat2
security-and-privacy/mat2
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Improve the previous commit

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- More tests
- More documentation
- Minor code cleanup
This commit is contained in:
jvoisin 2019-02-27 23:53:07 +01:00
parent 73d2966e8c
commit 55214206b5
3 changed files with 52 additions and 19 deletions
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40
libmat2/web.py
View File

@ -38,8 +38,8 @@ class CSSParser(abstract.AbstractParser):
class AbstractHTMLParser(abstract.AbstractParser):
tags_blacklist = set() # type: Set[str]
# In some html/xml based formats some tags are mandatory,
# so we're keeping them, but are discaring their contents
# In some html/xml-based formats some tags are mandatory,
# so we're keeping them, but are discaring their content
tags_required_blacklist = set() # type: Set[str]
def __init__(self, filename):
@ -72,6 +72,12 @@ class _HTMLParser(parser.HTMLParser):
"""Python doesn't have a validating html parser in its stdlib, so
we're using an internal queue to track all the opening/closing tags,
and hoping for the best.
Moreover, the parser.HTMLParser call doesn't provide a get_endtag_text
method, so we have to use get_starttag_text instead, put its result in a
LIFO, and transform it in a closing tag when needed.
Also, gotcha: the `tag` parameters are always in lowercase.
"""
def __init__(self, filename, blacklisted_tags, required_blacklisted_tags):
super().__init__()
@ -79,6 +85,7 @@ class _HTMLParser(parser.HTMLParser):
self.__textrepr = ''
self.__meta = {}
self.__validation_queue = [] # type: List[str]
# We're using counters instead of booleans, to handle nested tags
self.__in_dangerous_but_required_tag = 0
self.__in_dangerous_tag = 0
@ -93,15 +100,16 @@ class _HTMLParser(parser.HTMLParser):
original_tag = self.get_starttag_text()
self.__validation_queue.append(original_tag)
if tag in self.tag_required_blacklist:
self.__in_dangerous_but_required_tag += 1
if tag in self.tag_blacklist:
self.__in_dangerous_tag += 1
if self.__in_dangerous_tag == 0:
if self.__in_dangerous_but_required_tag <= 1:
if self.__in_dangerous_but_required_tag == 0:
self.__textrepr += original_tag
if tag in self.tag_required_blacklist:
self.__in_dangerous_but_required_tag += 1
def handle_endtag(self, tag: str):
if not self.__validation_queue:
raise ValueError("The closing tag %s doesn't have a corresponding "
@ -115,14 +123,15 @@ class _HTMLParser(parser.HTMLParser):
"tag %s in %s" %
(tag, previous_tag, self.filename))
if tag in self.tag_required_blacklist:
self.__in_dangerous_but_required_tag -= 1
if self.__in_dangerous_tag == 0:
if self.__in_dangerous_but_required_tag <= 1:
if self.__in_dangerous_but_required_tag == 0:
# There is no `get_endtag_text()` method :/
self.__textrepr += '</' + previous_tag + '>'
if tag in self.tag_required_blacklist:
self.__in_dangerous_but_required_tag -= 1
elif tag in self.tag_blacklist:
if tag in self.tag_blacklist:
self.__in_dangerous_tag -= 1
def handle_data(self, data: str):
@ -138,14 +147,13 @@ class _HTMLParser(parser.HTMLParser):
content = meta.get('content', 'harmful data')
self.__meta[name] = content
if self.__in_dangerous_tag != 0:
return
elif tag in self.tag_required_blacklist:
self.__textrepr += '<' + tag + ' />'
return
if self.__in_dangerous_but_required_tag == 0:
if self.__in_dangerous_tag == 0:
if tag in self.tag_required_blacklist:
self.__textrepr += '<' + tag + ' />'
return
if self.__in_dangerous_tag == 0:
if self.__in_dangerous_but_required_tag == 0:
self.__textrepr += self.get_starttag_text()
def remove_all(self, output_filename: str) -> bool:

4
tests/test_corrupted_files.py
View File

@ -269,9 +269,6 @@ class TestCorruptedFiles(unittest.TestCase):
os.remove('./tests/data/clean.html')
with open('./tests/data/clean.html', 'w') as f:
f.write('<meta><meta/></meta>')
f.write('<title><title>pouet</title></title>')
f.write('<title><mysupertag/></title>')
f.write('<doctitle><br/></doctitle><br/><notclosed>')
p = web.HTMLParser('./tests/data/clean.html')
with self.assertRaises(ValueError):
@ -281,6 +278,7 @@ class TestCorruptedFiles(unittest.TestCase):
p.remove_all()
os.remove('./tests/data/clean.html')
def test_epub(self):
with zipfile.ZipFile('./tests/data/clean.epub', 'w') as zout:
zout.write('./tests/data/dirty.jpg', 'OEBPS/content.opf')

27
tests/test_libmat2.py
View File

@ -633,6 +633,33 @@ class TestCleaning(unittest.TestCase):
os.remove('./tests/data/clean.cleaned.html')
os.remove('./tests/data/clean.cleaned.cleaned.html')
with open('./tests/data/clean.html', 'w') as f:
f.write('<title><title><pouet/><meta/></title></title><test/>')
p = web.HTMLParser('./tests/data/clean.html')
self.assertTrue(p.remove_all())
with open('./tests/data/clean.cleaned.html', 'r') as f:
self.assertEqual(f.read(), '<title></title><test/>')
os.remove('./tests/data/clean.html')
os.remove('./tests/data/clean.cleaned.html')
with open('./tests/data/clean.html', 'w') as f:
f.write('<test><title>Some<b>metadata</b><br/></title></test>')
p = web.HTMLParser('./tests/data/clean.html')
self.assertTrue(p.remove_all())
with open('./tests/data/clean.cleaned.html', 'r') as f:
self.assertEqual(f.read(), '<test><title></title></test>')
os.remove('./tests/data/clean.html')
os.remove('./tests/data/clean.cleaned.html')
with open('./tests/data/clean.html', 'w') as f:
f.write('<meta><meta/></meta>')
p = web.HTMLParser('./tests/data/clean.html')
self.assertTrue(p.remove_all())
with open('./tests/data/clean.cleaned.html', 'r') as f:
self.assertEqual(f.read(), '')
os.remove('./tests/data/clean.html')
os.remove('./tests/data/clean.cleaned.html')
def test_epub(self):
shutil.copy('./tests/data/dirty.epub', './tests/data/clean.epub')