envoyproxy/envoy

Stateful Session cookies incompatible between Envoy Processes.

Open

#44,111 opened on 2026年3月25日

GitHub で見る
 (1 comment) (0 reactions) (1 assignee)C++ (27,997 stars) (5,373 forks)batch import
bughelp wanted

説明

Title: Stateful Session cookies incompatible between Envoy Processes.

Description: When using Envoy as an Edge Proxy with multiple instances (an NLB in front) AND using the StatefulSession with cookies doesn't work properly.

The cookie is encoded with the expiry time BUT it uses the monotonic clock:

https://github.com/envoyproxy/envoy/blob/21b70d126c0a5c16d844658ee2db68f94deb7548/source/extensions/http/stateful_session/cookie/cookie.cc#L21-L22

When HTTP requests are routed to different Envoy processes, they will have different values for their monotonic clock and the cookie can inadvertently expire sooner then its should, which will cause a new backend to get selected.

I believe the appropriate fix is for time_source_.systemTime() to be used so that two envoy processes can validate each other cookies.

cc @cpakulski

コントリビューターガイド

技術スタック
cpp
領域
backendinfrastructure
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-3 hours
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
blocked
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
C++ knowledgeEnvoy internalsMonotonic vs system clock
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
40
調査方針
Examine the file source/extensions/http/stateful session/cookie/cookie.cc around line 21-22 where the monotonic clock is used. Consider replacing time source .monotonicTime() with time source .systemTime(). Verify that the change doesn't break existing tests. Check if any other parts of the codebase rely on the monotonic behavior for cookie expiry.