python2/00354-cve-2020-26116-http-request-method-crlf-injection-in-httplib.patch

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diff --git a/Lib/httplib.py b/Lib/httplib.py
index fcc4152..a636774 100644
--- a/Lib/httplib.py
+++ b/Lib/httplib.py
@@ -257,6 +257,10 @@ _contains_disallowed_url_pchar_re = re.compile('[\x00-\x20\x7f-\xff]')
# _is_allowed_url_pchars_re = re.compile(r"^[/!$&'()*+,;=:@%a-zA-Z0-9._~-]+$")
# We are more lenient for assumed real world compatibility purposes.
+# These characters are not allowed within HTTP method names
+# to prevent http header injection.
+_contains_disallowed_method_pchar_re = re.compile('[\x00-\x1f]')
+
# We always set the Content-Length header for these methods because some
# servers will otherwise respond with a 411
_METHODS_EXPECTING_BODY = {'PATCH', 'POST', 'PUT'}
@@ -935,6 +939,8 @@ class HTTPConnection:
else:
raise CannotSendRequest()
+ self._validate_method(method)
+
# Save the method for use later in the response phase
self._method = method
@@ -1020,6 +1026,16 @@ class HTTPConnection:
# On Python 2, request is already encoded (default)
return request
+ def _validate_method(self, method):
+ """Validate a method name for putrequest."""
+ # prevent http header injection
+ match = _contains_disallowed_method_pchar_re.search(method)
+ if match:
+ raise ValueError(
+ "method can't contain control characters. %r "
+ "(found at least %r)"
+ % (method, match.group()))
+
def _validate_path(self, url):
"""Validate a url for putrequest."""
# Prevent CVE-2019-9740.
diff --git a/Lib/test/test_httplib.py b/Lib/test/test_httplib.py
index d8a57f7..96a61dd 100644
--- a/Lib/test/test_httplib.py
+++ b/Lib/test/test_httplib.py
@@ -385,6 +385,29 @@ class HeaderTests(TestCase):
conn.putheader(name, value)
+class HttpMethodTests(TestCase):
+ def test_invalid_method_names(self):
+ methods = (
+ 'GET\r',
+ 'POST\n',
+ 'PUT\n\r',
+ 'POST\nValue',
+ 'POST\nHOST:abc',
+ 'GET\nrHost:abc\n',
+ 'POST\rRemainder:\r',
+ 'GET\rHOST:\n',
+ '\nPUT'
+ )
+
+ for method in methods:
+ with self.assertRaisesRegexp(
+ ValueError, "method can't contain control characters"):
+ conn = httplib.HTTPConnection('example.com')
+ conn.sock = FakeSocket(None)
+ conn.request(method=method, url="/")
+
+
+
class BasicTest(TestCase):
def test_status_lines(self):
# Test HTTP status lines
@@ -1009,9 +1032,9 @@ class TunnelTests(TestCase):
@test_support.reap_threads
def test_main(verbose=None):
- test_support.run_unittest(HeaderTests, OfflineTest, BasicTest, TimeoutTest,
- HTTPTest, HTTPSTest, SourceAddressTest,
- TunnelTests)
+ test_support.run_unittest(HeaderTests, OfflineTest, HttpMethodTests,
+ BasicTest, TimeoutTest, HTTPTest, HTTPSTest,
+ SourceAddressTest, TunnelTests)
if __name__ == '__main__':
test_main()