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kong.client.tls

kong.client.tls

The client.tls module provides functions for interacting with TLS connections from client.

kong.client.tls.request_client_certificate()

Requests client to present its client-side certificate to initiate mutual TLS authentication between server and client.

This function only requests, but does not require the client to start the mTLS process. Even if the client did not present a client certificate the TLS handshake will still complete (obviously not being mTLS in that case). Whether the client honored the request can be determined using get_full_client_certificate_chain in later phases.

Phases

• certificate

Returns

1. true|nil true if request was received, nil if request failed

2. nil|err nil if success, or error message if failure

Usage

local res, err = kong.client.tls.request_client_certificate()
if not res then
  -- do something with err
end

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kong.client.tls.disable_session_reuse()

Prevents the TLS session for the current connection from being reused by disabling session ticket and session ID for the current TLS connection.

Phases

• certificate

Returns

1. true|nil true if success, nil if failed

2. nil|err nil if success, or error message if failure

Usage

local res, err = kong.client.tls.disable_session_reuse()
if not res then
  -- do something with err
end

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kong.client.tls.get_full_client_certificate_chain()

Returns the PEM encoded downstream client certificate chain with the client certificate at the top and intermediate certificates (if any) at the bottom.

Phases

• rewrite, access, balancer, header_filter, body_filter, log

Returns

1. string|nil PEM-encoded client certificate if mTLS handshake was completed, nil if an error occurred or client did not present its certificate

2. nil|err nil if success, or error message if failure

Usage

local cert, err = kong.client.get_full_client_certificate_chain()
if err then
  -- do something with err
end

if not cert then
  -- client did not complete mTLS
end

-- do something with cert

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kong.client.tls.set_client_verify()

Overrides client verify result generated by the log serializer.

By default, the request.tls.client_verify field inside the log generated by Kong’s log serializer is the same as the $ssl_client_verify Nginx variable.

Only “SUCCESS”, “NONE” or “FAILED:" are accepted values.

This function does not return anything on success, and throws an Lua error in case of failures.

Phases

• rewrite, access, balancer

Usage

kong.client.tls.set_client_verify("FAILED:unknown CA")

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