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Implementation of Offline mode for TUF

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#2,359 14 則留言 3 個 reaction 已指派 0 人 在 GitHub 檢視

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
35/100
Issue 類型
功能
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
python
領域
security

研究方向

從 updater.py 中的 UpdaterConfig 開始,追蹤針對所提議 offline boolean 的 updater 流程。接著閱讀 trusted_metadata_set.py,以找出涉及的中繼資料到期檢查。完成的標準是:離線模式向使用者發出警告,在本機中繼資料不存在時回報錯誤,在不進行到期檢查的情況下載入本機材料,並避免線上重新整理。

由索引模型根據 Issue 內容生成。

描述

low-prio

Sigstore's python client would like to use the TUF updater in a fully offline manner to allow for opt-in offline verification. To do so would require TUF to function using only locally-stored materials.

Within TUF's current implementation, regardless of the validity of already-stored materials, online access is always required. Thus far, we've been able to run the updater on a modified branch using only local materials and seek to expand this modification to allow for opt-in usage of expired metadata in offline mode. This would be useful for clients like sigstore that would to allow for verification with metadata that was previously valid. A primary use case for this would involve verifying on machines that do not necessarily maintain a connection online.

Changes on our experimental branch have been within updater.py and have consisted of adding a new boolean to UpdaterConfig and avoiding online refreshes if said boolean has been set. Further implementation would require changes to trusted_metadata_set.py to skip checks against the expiry of the metadata if the aforementioned boolean has been set.

Ideally the flow of TUF's updater with these changes would go as follows, given the boolean is set:

  • Warn users about risks of using offline verification
  • Check to see if local metadata exists; exiting with an error message if none is found
  • Load local metadata, skipping checks against expiry within trusted_metadata_set.py
主要語言
Python
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從這裡開始

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  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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