Osquery (Mac OS X)¶
No node key¶
There are a number of reasons for this error:
Your enrollment secret is invalid. Are you re-installing Zercurity from another account or deployment server? Try removing the
enroll.datfile within the Zercurity installation folder.
Zercurity has either blocked an enrollment from talking place. Please contact our support team to help resolve this for you.
Failed enrollment request to https://api.zercurity.com/v1/osquery/enroll (No node key returned from TLS enroll plugin) retrying...
tail -f /var/log/zercurity_osqueryd_stderr.log
sudo /bin/launchctl unload "/Library/LaunchDaemons/com.zercurity.osqueryd.plist" sudo /bin/launchctl load "/Library/LaunchDaemons/com.zercurity.osqueryd.plist"
Watchdog Issues (Performance)¶
By default Zercurity has configured Osquery to limit the resources used by the agent. Sometimes you may want to use more complex and expensive queries that use more system resources. Obviously this will impact the users system performance.
Below are the Default Zercurity settings:
--watchdog_level=0 (Performance limit level (0=normal, 1=restrictive, -1=off)) --watchdog_memory_limit=400 (Override watchdog profile memory limit (e.g., 300, for 300MB)) --watchdog_utilization_limit=21 (Override watchdog profile CPU utilisation limit)
If you’ve run a query and received the following error, you will need to tweak the Osquery watchdog configuration:
osqueryd worker (1184) stopping: Maximum sustainable CPU utilisation limit exceeded: 12
You can either override the settings on the Zercurity installer via Settings -> Configuration. Or you can modify these settings locally. The Osquery flags file is stored in the following locations.
sudo vim /Library/LaunchDaemons/com.zercurity.osqueryd.plist
sudo vim /etc/osquery/osquery.flags
Once you have updated the
osquery.flags file you will either need to
reboot your system or restart the Osquery daemon as per the steps above
in order for these changes to take effect.
Zercurity makes use of Google Santa for its Mac OSX application whitelisting and blacklisting.
Force sync rules¶
Sometimes you may want to forcefully synchronise your local machine with
the remote server to ensure all rules are up-to-date. The
will also send any pending updates back to the Zercurity server.
sudo santactl sync
Santa daemon failing to start¶
If you’ve installed Zercurity locally without using an MDM you will most likely encounter the following error. As during the installation you may not have given permission to Santa to install its System extension.
sudo santactl sync An error occurred communicating with the daemon, is it running?
The first thing to do is check the logs as described below.
It maybe that you need to manually “Allow” the Santa system extension. The installer should have prompted you to do this if your not using an MDM.
If that still doesn’t work then make sure that Santa has “Full Disk Access”. You may need to reload the Santa daemon after completing this step.
You can show the logs for Google Santa using the following command.
/usr/bin/log show --info --debug --predicate 'senderImagePath CONTAINS "Santa"' --last 1d
Full Disk Access¶
Google’s Santa requires full disk access in order for the Daemon to start.
Once checked you’ll need to reload the service.
sudo /bin/launchctl unload -w "/Library/LaunchDaemons/com.google.santa.bundleservice.plist" sudo /bin/launchctl load -w "/Library/LaunchDaemons/com.google.santa.bundleservice.plist"
Missing Zercurity profile¶
The Zercurity installer should automatically install our profile. If the
profile can’t be found or was removed you’ll get the following error when
trying to manually
sync Santa using
sudo santactl sync --debug Missing SyncBaseURL. Exiting.
To resolve this you’ll need to re-install Zercurity.
Bad certificates file¶
In the event that your
/usr/local/zercurity/zercurity.pem is missing
or incomplete. You’ll receive the following error:
sudo santactl sync --debug Server Trust: Server isn't trusted. SecTrustResultType: 5 Unable to verify server identity. santactl: E santactl: HTTP Response: -999 cancelled santactl: E santactl: Preflight failed, will try again once https://api.zercurity.local/v1/santa/ is reachable
Santa has failed to connect to the remote server using the provided SSL bundle. The PEM file must contain the complete certificate chain. Including both the Certificate authority (CA) and its intermediate certificates.
You can validate your PEM file using the following command:
openssl verify -CAfile /usr/local/zercurity/zercurity.pem \ -untrusted /usr/local/zercurity/zercurity.pem \ /usr/local/zercurity/zercurity.pem
All certificates must be included in the same file. The
is used to include the intermediate certificate. These are the certificates
between the CA and server certificate.
openssl verify returns
and you are still receiving the
-999 error then its likely your
certificate does not conform to Apple’s transport security (ATS) requirements.
TLS server certificates and issuing CAs using RSA keys must use key sizes greater than or equal to 2048 bits. Certificates using RSA key sizes smaller than 2048 bits are no longer trusted for TLS.
TLS server certificates and issuing CAs must use a hash algorithm from the SHA-2 family in the signature algorithm. SHA-1 signed certificates are no longer trusted for TLS.
TLS server certificates must present the DNS name of the server in the Subject Alternative Name extension of the certificate. DNS names in the CommonName of a certificate are no longer trusted.
You can check that a certificate has the correct extensions with:
openssl x509 -in api.local.zercurity.com.crt -text -noout
Lastly, if you receive the following error:
HTTP Response: -1200 An SSL error has occurred and a secure connection to the server cannot be made. Preflight failed, aborting run
The zercurity CA needs to be added to your system roots trust-store. This can be done using the following command:
sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain /usr/local/zercurity/zercurity.pem