ClickHouse/tests/config/client_config.xml

<!-- Config set into /etc/clickhouse-client/. It's used if no other configs are found. -->
<config>
    <openSSL>
        <client>
            <loadDefaultCAFile>true</loadDefaultCAFile>
            <cacheSessions>true</cacheSessions>
            <disableProtocols>sslv2,sslv3</disableProtocols>
            <preferServerCiphers>true</preferServerCiphers>
            <invalidCertificateHandler>
                <name>AcceptCertificateHandler</name>  <!-- For tests only-->
            </invalidCertificateHandler>
        </client>
    </openSSL>

    <!-- Default timeout is 5 sec. Set it to 10 to avoid tests flakiness with slow builds (debug, tsan) -->
    <sync_request_timeout>10</sync_request_timeout>
</config>