fix #913: redirect() doesn't filter "\r\n" leads to CRLF attack

The previous fix (6d7e13d) was incomplete.

bottle.py

@@ -1592,21 +1592,21 @@ def _hval(value):
     return value
 
 class HeaderProperty(object):
-    def __init__(self, name, reader=None, writer=str, default=''):
+    def __init__(self, name, reader=None, writer=None, default=''):
         self.name, self.default = name, default
         self.reader, self.writer = reader, writer
         self.__doc__ = 'Current value of the %r header.' % name.title()
 
     def __get__(self, obj, _):
         if obj is None: return self
-        value = obj.headers.get(self.name, self.default)
+        value = obj.get_header(self.name, self.default)
         return self.reader(value) if self.reader else value
 
     def __set__(self, obj, value):
-        obj.headers[self.name] = self.writer(value)
+        obj[self.name] = self.writer(value) if self.writer else value
 
     def __delete__(self, obj):
-        del obj.headers[self.name]
+        del obj[self.name]
 
 
 class BaseResponse(object):
@@ -1723,8 +1723,7 @@ def __getitem__(self, name):
         return self._headers[_hkey(name)][-1]
 
     def __setitem__(self, name, value):
-        self._headers[_hkey(name)] = [value if isinstance(value, unicode) else
-                                      str(value)]
+        self._headers[_hkey(name)] = [_hval(value)]
 
     def get_header(self, name, default=None):
         """ Return the value of a previously defined header. If there is no
@@ -1734,13 +1733,11 @@ def get_header(self, name, default=None):
     def set_header(self, name, value):
         """ Create a new response header, replacing any previously defined
             headers with the same name. """
-        self._headers[_hkey(name)] = [value if isinstance(value, unicode)
-                                            else str(value)]
+        self._headers[_hkey(name)] = [_hval(value)]
 
     def add_header(self, name, value):
         """ Add an additional response header, not removing duplicates. """
-        self._headers.setdefault(_hkey(name), []).append(
-            value if isinstance(value, unicode) else str(value))
+        self._headers.setdefault(_hkey(name), []).append(_hval(value))
 
     def iter_headers(self):
         """ Yield (header, value) tuples, skipping headers that are not

test/test_environ.py

@@ -699,16 +699,27 @@ def test_non_string_header(self):
         self.assertEqual('None', response['x-test'])
 
     def test_prevent_control_characters_in_headers(self):
-        apis = 'append', 'replace', '__setitem__', 'setdefault'
         masks = '{}test', 'test{}', 'te{}st'
         tests = '\n', '\r', '\n\r', '\0'
+
+        # Test HeaderDict
+        apis = 'append', 'replace', '__setitem__', 'setdefault'
         for api, mask, test in itertools.product(apis, masks, tests):
             hd = bottle.HeaderDict()
             func = getattr(hd, api)
             value = mask.replace("{}", test)
             self.assertRaises(ValueError, func, value, "test-value")
             self.assertRaises(ValueError, func, "test-name", value)
 
+        # Test functions on BaseResponse
+        apis = 'add_header', 'set_header', '__setitem__'
+        for api, mask, test in itertools.product(apis, masks, tests):
+            rs = bottle.BaseResponse()
+            func = getattr(rs, api)
+            value = mask.replace("{}", test)
+            self.assertRaises(ValueError, func, value, "test-value")
+            self.assertRaises(ValueError, func, "test-name", value)
+
     def test_expires_header(self):
         import datetime
         response = BaseResponse()