Fix root self verification to only count a keyid once towards the threshold #1218
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trishankatdatadog
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Nov 23, 2020
jku
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jku
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lukpueh
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Thanks for the quick fix and the test, @joshuagl! Please add DCO and we are good to go.
Also, kudos to @trishankatdatadog, for bringing this to our attention.
When the updater is verifying that the new root metadata is signed by a threshold of keys defined by the new root metadata itself, multiple signatures with the same keyid should not be counted more than once towards the threshold. Implement a test for this, which currently fails. Reported-by: Trishank Karthik Kuppusamy <[email protected]> Signed-off-by: Joshua Lock <[email protected]>
When verifying newly downloaded root metadata with the keys listed in the root metadata being verified, multiple signatures with the same keyid should not be counted towards the threshold. A keyid should only count once towards the threshold. This fixes the _verify_root_self_signed() method introduced in PR theupdateframework#1101 to ensure that keyids are only counted once when verifying a threshold of new root signatures. Signed-off-by: Joshua Lock <[email protected]>
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Fixes #N/A
Description of the changes being introduced by the pull request:
@trishankatdatadog perceptively observed that
_verify_root_self_signed(), introduced in #1101, will incorrectly count multiple signatures with the same keyid towards the threshold for new signatures listed inside an updated root metadata file.This PR introduces:
_verify_root_self_signed()to uniquify a list of keyids for which signatures have been verified, and compare only the number of unique keyids against the threshold.Please verify and check that the pull request fulfills the following
requirements: