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Technically yes, but I htink, theway youare asking it, realistically no.

If there is no policy.json file, I think Keystone denies all.

you can do ADMIN_TOKEN, but in a sane deployment, that should be disabled. You wouldneed the same degree of acces to the machine to enable ADMIN_TOKEN as to replace the policy file.

you could just as easily add a new policy.json file. The policy.json file is protected by operatin system file permissions; make it world readable, but writable only by root is it best approach.

If it could be modified once, it can be modified again.