Both block and filter actions write responses to the client based upon
the source IP address of the UDP packet containing the query. An
attacker spoofing the source IP address to that of their target, can
elicit a response to be sent to the victim host, known as DNS
Reflection. If an attacker is able to elicit a large response from a
relatively small query, with a spoofed source IP address, they are able
to increase the amount of data sent to the victim, known as DNS
Amplification. Scaling this from one to many queries allows an attacker
to perform an effective Denial of Service (DoS) attack against their
target.
Adding the drop action enables CoreDNS to ignore queries of a given
type or network range from being processed and a response written,
where an operator knows ahead of time, should not originate or be
destined to.
Signed-off-by: rsclarke <hey@rsclarke.dev>
Signed-off-by: rsclarke <hey@rsclarke.dev>
* introduce new interface "dnsserver.Viewer", that allows a plugin implementing it to decide if a query should be routed into its server block.
* add new plugin "view", that uses the new interface to enable a user to define expression based conditions that must be met for a query to be routed to its server block.
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
Signed-off-by: Krzysztof Narkiewicz <knarkiewicz@bloomberg.net>
Signed-off-by: Krzysztof Narkiewicz <knarkiewicz@bloomberg.net>
Co-authored-by: Krzysztof Narkiewicz <knarkiewicz@bloomberg.net>
* Added identity and version support to dnstap plugin
Signed-off-by: Daniel Jolly <code@danieljolly.com>
* Added missing commas
Signed-off-by: Daniel Jolly <code@danieljolly.com>
* Moved byte slice conversions to setup rather than handler.
Fixed indentation issue.
Signed-off-by: Daniel Jolly <code@danieljolly.com>
* Improved setup config parsing and added tests to detect various configurations
Signed-off-by: Daniel Jolly <code@danieljolly.com>
Signed-off-by: Daniel Jolly <code@danieljolly.com>
Co-authored-by: Daniel Jolly <code@danieljolly.com>
* plugin/forward: convert the specified domain of health_check to Fqdn
* plugin/forward: update readme for health check
Signed-off-by: vanceli <vanceli@tencent.com>
* Add PTR records to supported types
Signed-off-by: Alex Bulatov <xbulat@gmail.com>
* Add extra line
Signed-off-by: Alex Bulatov <xbulat@gmail.com>
* Fix title
Signed-off-by: Alex Bulatov <xbulat@gmail.com>
Signed-off-by: Alex Bulatov <xbulat@gmail.com>
* plugin/acl : add support for Extended DNS Errors
Signed-off-by: Ondřej Benkovský <ondrej.benkovsky@jamf.com>
* fixup! plugin/acl : add support for Extended DNS Errors
Signed-off-by: Ondřej Benkovský <ondrej.benkovsky@jamf.com>
For responses synthesized by known wildcard records, publish metadata containing the wildcard record name
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
* Exclude External IP addresses from being added to the existing kubernetes' plugin IP->Service index
* Add support for PTR requests on External IPs of Services to the k8s_external plugin
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
