http2 window size use case
draft-chen-httpbis-window-size-use-case-00
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Active Internet-Draft (individual)
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chenmeiling
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Li Su
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2020-12-13
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httpbis M. Chen
Internet-Draft Li. Su
Intended status: Informational China Mobile
Expires: June 17, 2021 December 14, 2020
http2 window size use case
draft-chen-httpbis-window-size-use-case-00
Abstract
This document presents an use case which actually happening in our
network, when window_size_increment in the window update frame less
than 128 bytes and the increased window size also less than 128
bytes, then network connection will come to an error.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on June 17, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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Internet-Draft http2 window size use case December 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Use Case . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 4
7. Informative References . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
The following content is from RFC 7540[RFC7540]
When an HTTP/2 connection is first established, new streams are
created with an initial flow-control window size of 65,535 octets.
The connection flow-control window is also 65,535 octets. Both
endpoints can adjust the initial window size for new streams by
including a value for SETTINGS_INITIAL_WINDOW_SIZE in the SETTINGS
frame that forms part of the connection preface. The connection
flow-control window can only be changed using WINDOW_UPDATE frames.
SETTINGS_INITIAL_WINDOW_SIZE (0x4): Indicates the sender's initial
window size (in octets) for stream-level flow control. The initial
value is 2^16-1 (65,535) octets.
Window Size Increment defined in the Window_update is 31, the legal
range for the increment to the flow-control window is 1 to 2^31-1
(2,147,483,647) octets.
RFC 7540 just Specifies the maximum value of Window and the Window
Size Increment, But there is no obvious rule about minimum values.
2. Terminology
The readers should be familiar with the terms defined in.
In addition, this document makes use of the following terms:
Window_update: The WINDOW_UPDATE frame (type=0x8) is used to
implement flow control;
3. Use Case
This section describes use case which happens between two different
manufacturers. They both use HTTP2.0 protocol to transmit messages.
We found this phenomenon, one issues a regular registration request,
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Internet-Draft http2 window size use case December 2020
the other one receives the request, but judged to be attack
behaviour.
+---------+ +----------+
| Sender | |Receiver |
| | | |
+----+----+ +-----+----+
| Reqistration request |
+----------------------------------->
| |
| |
+----------------------------------->
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