Mitigate role escalation in the ask_for_access viewset #1580
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We check that the role set in a ask_for_access is not higher than the user's role accepting the request. We prevent case where ad min will grant a user owner in order to take control of the document. Only owner can accept an owner role.
When a ask_for_access creation is made, we explicitly remove the owner role to prevent role escalation.
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Purpose
Via the ask_for_access viewset, it is possible for an administrator to escaladate an other user to an owner role and then take the control of the document by removing all other owner.
This PR ensure that an administrator can not accept role higher than the one he/she already have. Also, the serializer does not accept the owner role anymore.
Proposal