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[role="xpack"]
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[[pki-realm]]
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=== PKI user authentication
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You can configure {es} to use Public Key Infrastructure (PKI) certificates to
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authenticate users. This requires clients connecting directly to {es} to
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present X.509 certificates. The certificates must first be accepted for
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authentication on the SSL/TLS layer on {es}. Only then they are optionally
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further validated by a PKI realm. See <<pki-realm-for-direct-clients>>.
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You can also use PKI certificates to authenticate to {kib}, however this
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requires some additional configuration. On {es}, this configuration enables {kib}
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to act as a proxy for SSL/TLS authentication and to submit the client
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certificates to {es} for further validation by a PKI realm. See
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<<pki-realm-for-proxied-clients>>.
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include::configuring-pki-realm.asciidoc[]
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