V-285239

Discussion

To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every pair of name servers. The key also can be used for securing other transactions, such as dynamic updates, DNS queries, and responses. The binary key string that is generated by most key generation utilities used with DNSSEC is Base64-encoded. TSIG is a string used to generate the message authentication hash stored in a TSIG RR and used to authenticate an entire DNS message. The process of authenticating the source of a message and its integrity through hash-based message authentication codes (HMAC) is specified through a set of DNS specifications known collectively as TSIG. The sender of the message uses the HMAC function to generate a MAC and sends this MAC along with the message to the receiver. The receiver, who shares the same secret key, uses the key and HMAC function used by the sender to compute the MAC on the received message. The receiver then compares the computed MAC with the received MAC; if the two values match, it provides assurance that the message has been received correctly and that the sender belongs to the community of users sharing the same secret key. Thus, message source authentication and integrity verification are performed in a single process. To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every pair of name servers. The key also can be used for securing other transactions, such as dynamic updates, DNS queries, and responses. The binary key string that is generated by most key generation utilities used with DNSSEC is Base64-encoded. TSIG is a string used to generate the message authentication hash stored in a TSIG RR and used to authenticate an entire DNS message. Satisfies: SRG-APP-000158-DNS-000076, SRG-APP-000158-DNS-000015, SRG-APP-000219-DNS-000028, SRG-APP-000349-DNS-000043, SRG-APP-000394-DNS-000049, SRG-APP-000395-DNS-000050

Check Content

Verify that Infoblox external logging is configured to use TSIG keys to validate zone transfers to non-Grid systems.

1. Navigate to Data Management >> DNS >> Zones tab. 
2. Review each zone by clicking "Edit" and inspecting the "DNS service members" tab. If using Name Server Groups, select the "Name Servers" tab. 
Note: If all entries in the "Type" column are configured as "Grid", this check is Not Applicable. 
3. Navigate to Data Management >> DNS >> Members tab. 
4. Select each non-Grid DNS service member, and click the "Edit".
5. Click the "Zone Transfers" tab and verify configuration of TSIG Access Control Entry (ACE). 
6. When complete, click "Cancel" to exit the "Properties" screen. 

If there is a non-Grid system that uses zone transfers but does not have a TSIG key, this is a finding.