Derive marble private secrets using marble type in addition to UUID#730
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daniel-weisse merged 1 commit intomasterfrom Sep 20, 2024
Merged
Derive marble private secrets using marble type in addition to UUID#730daniel-weisse merged 1 commit intomasterfrom
daniel-weisse merged 1 commit intomasterfrom
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Signed-off-by: Daniel Weiße <dw@edgeless.systems>
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thomasten
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Sep 19, 2024
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Currently, when a marble requests a private secret, that secret is derived from the coordinators root key using HKDF with the Marble's UUID and the name of the secret being used as salt for the derivation.
This means that any two marbles with the same UUID will receive the same secrets, even if they have different marble types.
Since this behavior is not always clear to users, and they should use shared secrets to facilitate this secret instead, this PR updates the secret generation code to include the name of the marble as Info parameter for the HKDF function so any two Marbles of different types will receive different secrets even if they have the same UUID.
Proposed changes
DisableSecretBindingon a Marble