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For multi-role delegations can min_roles_in_agreement include multiple instances of the same role? For example, if Targets delegates to Alice and Bob, who both delegate to Charlie, can Charlie's approval count for a min_roles_in_agreement of 2? If Bob also delegates to Daniela, how can he know to also check for her approval?
If Charlie's approval is not sufficient, the resolution of multi-role delegations in TAP 3 will need to keep track of which roles have been applied to min_roles_in_agreement. This will require the DFS to check all roles rather than returning after the first match, which could impact the efficiency of TUF.
See related bug in the reference implementation theupdateframework/python-tuf#920 where adding the same key with a different signature scheme enables a single key to fulfil a threshold of > 1
For multi-role delegations can
min_roles_in_agreement
include multiple instances of the same role? For example, if Targets delegates to Alice and Bob, who both delegate to Charlie, can Charlie's approval count for amin_roles_in_agreement
of 2? If Bob also delegates to Daniela, how can he know to also check for her approval?If Charlie's approval is not sufficient, the resolution of multi-role delegations in TAP 3 will need to keep track of which roles have been applied to
min_roles_in_agreement
. This will require the DFS to check all roles rather than returning after the first match, which could impact the efficiency of TUF.This issue came out of a discussion about determining keyids.
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