+27
-17
lines changedFilter options
+27
-17
lines changed Original file line number Diff line number Diff line change
@@ -39,23 +39,21 @@ def nameprep(label):
39 39 40 40
# Check bidi
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RandAL = [stringprep.in_table_d1(x) for x in label]
42 -
for c in RandAL:
43 -
if c:
44 -
# There is a RandAL char in the string. Must perform further
45 -
# tests:
46 -
# 1) The characters in section 5.8 MUST be prohibited.
47 -
# This is table C.8, which was already checked
48 -
# 2) If a string contains any RandALCat character, the string
49 -
# MUST NOT contain any LCat character.
50 -
if any(stringprep.in_table_d2(x) for x in label):
51 -
raise UnicodeError("Violation of BIDI requirement 2")
52 - 53 -
# 3) If a string contains any RandALCat character, a
54 -
# RandALCat character MUST be the first character of the
55 -
# string, and a RandALCat character MUST be the last
56 -
# character of the string.
57 -
if not RandAL[0] or not RandAL[-1]:
58 -
raise UnicodeError("Violation of BIDI requirement 3")
42 +
if any(RandAL):
43 +
# There is a RandAL char in the string. Must perform further
44 +
# tests:
45 +
# 1) The characters in section 5.8 MUST be prohibited.
46 +
# This is table C.8, which was already checked
47 +
# 2) If a string contains any RandALCat character, the string
48 +
# MUST NOT contain any LCat character.
49 +
if any(stringprep.in_table_d2(x) for x in label):
50 +
raise UnicodeError("Violation of BIDI requirement 2")
51 +
# 3) If a string contains any RandALCat character, a
52 +
# RandALCat character MUST be the first character of the
53 +
# string, and a RandALCat character MUST be the last
54 +
# character of the string.
55 +
if not RandAL[0] or not RandAL[-1]:
56 +
raise UnicodeError("Violation of BIDI requirement 3")
59 57 60 58
return label
61 59
@@ -1688,6 +1688,12 @@ def test_builtin_encode(self):
1688 1688
self.assertEqual("pyth\xf6n.org".encode("idna"), b"xn--pythn-mua.org")
1689 1689
self.assertEqual("pyth\xf6n.org.".encode("idna"), b"xn--pythn-mua.org.")
1690 1690 1691 +
def test_builtin_decode_length_limit(self):
1692 +
with self.assertRaisesRegex(UnicodeError, "too long"):
1693 +
(b"xn--016c"+b"a"*1100).decode("idna")
1694 +
with self.assertRaisesRegex(UnicodeError, "too long"):
1695 +
(b"xn--016c"+b"a"*70).decode("idna")
1696 + 1691 1697
def test_stream(self):
1692 1698
r = codecs.getreader("idna")(io.BytesIO(b"abc"))
1693 1699
r.read(3)
@@ -0,0 +1,6 @@
1 +
The IDNA codec decoder used on DNS hostnames by :mod:`socket` or :mod:`asyncio`
2 +
related name resolution functions no longer involves a quadratic algorithm.
3 +
This prevents a potential CPU denial of service if an out-of-spec excessive
4 +
length hostname involving bidirectional characters were decoded. Some protocols
5 +
such as :mod:`urllib` http ``3xx`` redirects potentially allow for an attacker
6 +
to supply such a name.
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