File CVE-2020-26116-httplib-header-injection.patch of Package python-doc

---
 Lib/httplib.py           |   15 +++++++++++++++
 Lib/test/test_httplib.py |   22 +++++++++++++++++++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

--- a/Lib/httplib.py
+++ b/Lib/httplib.py
@@ -262,6 +262,10 @@ _contains_disallowed_url_pchar_re = re.c
 _METHODS_EXPECTING_BODY = {'PATCH', 'POST', 'PUT'}
 
 
+# These characters are not allowed within HTTP method names
+# to prevent http header injection.
+_contains_disallowed_method_pchar_re = re.compile('[\x00-\x1f]')
+
 class HTTPMessage(mimetools.Message):
 
     def addheader(self, key, value):
@@ -940,6 +944,8 @@ class HTTPConnection:
         else:
             raise CannotSendRequest()
 
+        self._validate_method(method)
+
         # Save the method for use later in the response phase
         self._method = method
 
@@ -1179,6 +1185,15 @@ class HTTPConnection:
             response.close()
             raise
 
+    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()))
+
 
 class HTTP:
     "Compatibility class with httplib.py from 1.5."
--- a/Lib/test/test_httplib.py
+++ b/Lib/test/test_httplib.py
@@ -1007,10 +1007,30 @@ class TunnelTests(TestCase):
         self.assertTrue('Host: destination.com' in conn.sock.data)
 
 
+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:
+            conn = httplib.HTTPConnection('example.com')
+            conn.sock = FakeSocket(None)
+            self.assertRaises(ValueError, conn.request, method=method, url="/")
+
+
 @test_support.reap_threads
 def test_main(verbose=None):
     test_support.run_unittest(HeaderTests, OfflineTest, BasicTest, TimeoutTest,
-                              HTTPTest, HTTPSTest, SourceAddressTest,
+                              HTTPTest, HttpMethodTests, HTTPSTest, SourceAddressTest,
                               TunnelTests)
 
 if __name__ == '__main__':