On 03/12/2016 19:46, i...@flyingfischer.ch wrote:
> Am 03.12.2016 um 20:29 schrieb Mark Thomas:
>> On 03/12/2016 13:28, i...@flyingfischer.ch wrote:
>>> Between Tomcat 8.38 und 8.39 there seems to be a change in handling URL
>>> parameters:
>>>
>>> ¶mxy=1|2
>>>
>>> This will cause Tomcat to return a 400 error since 8.39. It is the
>>> character "|" that causes the new behaviour. I suspect these changes:
>>>
>>> https://github.com/apache/tomcat/commit/516bda676ac8d0284da3e0295a7df70391315360
>>>
>>>
>>>
>>> First thing to know:
>>>
>>> Is this intended?
>> Yes.
>>
>>> Second:
>>>
>>> Anyway to restore the previous behaviour of 8.38 with a config option.
>> No, since the changes were in response to a security issue.
>>
>> '|' is not a valid character in any part of an HTTP/1.1 request-target.
>> You need to fix whatever broken client is sending '|' without %
>> encoding it.
>>
>> Mark
>
> Unfortunately (for me) this will not be possible: This is a kind of a
> proxy/rewriter situation where I cannot control the input being sent. I
> need to be able to deal with any kind of request you will see out there
> in the wild.
If a request contains and unencoded '|' in the request-target, the
correct way to deal with it is to return a 400.
Mark
>
> I assume it is this part, responsible for the new behaviour?
>
> // Not valid for request target.
> // Combination of multiple rules from RFC7230 and RFC 3986.
> Must be
> // ASCII, no controls plus a few additional characters excluded
> if (IS_CONTROL[i] || i > 127 ||
> i == ' ' || i == '\"' || i == '#' || i == '<' || i
> == '>' || i == '\\' ||
> i == '^' || i == '`' || i == '{' || i == '|' || i
> == '}') {
> IS_NOT_REQUEST_TARGET[i] = true;
> }
>
> Do you see any better way to influence this, instead of patching and
> rebuilding from scratch?
>
> Thanks!
> Markus
>
>
>
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