cis-gworkspace-3.1.3.2.1

DevOps & Security

Ensure that DKIM is enabled for all mail enabled domains

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3.1.3.2.1 Ensure that DKIM is enabled for all mail enabled domains

Overview

Property	Value
CIS ID	3.1.3.2.1
Level	L1
Profile Applicability	Enterprise Level 1
Assessment Type	Manual
Section	Gmail > Authenticate email

Description

DKIM adds an encrypted signature to the header of all outgoing messages. Email servers that get signed messages use DKIM to decrypt the message header, and verify the message was not changed after it was sent.

Rationale

Spoofing is a common unauthorized use of email, so some email servers require DKIM to prevent email spoofing.

Impact

There should be no impact of setting up DKIM however, organizations should ensure appropriate setup to ensure continuous mail-flow.

Default Value

None

Audit

To verify this setting via the Google Workspace Admin Console:

Log in to https://admin.google.com as an administrator
Select Apps
Select Google Workspace
Select Gmail
Under Authenticate email, ensure a DKIM record exists for each mail enabled domain

Remediation

To configure this setting via the Google Workspace Admin Console:

Log in to https://admin.google.com as an administrator
Select Apps
Select Google Workspace
Select Gmail
Under Authenticate email, select Generate new record
Under Select DKIM key bit length, select the appropriate key bit length (2048 is recommended if supported)
Under Prefix selector (optional), enter the appropriate prefix selector
Use the text at TXT record value to update the DNS record at your domain host
Select Start Authentication

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	9.5 Implement DMARC		x	x
v7	7.8 Implement DMARC and Enable Receiver-Side Verification		x	x