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3. use cross signing with name constraints to not have this problem

https://tools.ietf.org/html/rfc5280#section-4.2.1.10




4. Find out that name constraints are either not supported or ignore by basically all major libraries.


Issuing CA cert with Name Constraints is good, but end user should recognize the certificate is constrained to their domains or not.


The end user should be able to choose the domains the root is valid for - regardless of x509 name constraints.




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