The registration process¶
Every Wazuh Agent send data to Wazuh Manager via secure way called OSSEC message protocol this encrypts messages using a pre-shared key. Initially when you successfully install a new Wazuh Agent this cannot comunicate with Wazuh Manager for lack of the pre-shared key.
The registration process consists of a mechanism to create a trust relationship between the Manager and a Agent, this process could be done in a Manager itself or with a registration service, this service it listen on the Manager, a Agent could request a pre-shared key using some credentials and it will reply with the pre-shared key and store the new Agent in local database.
Another aproach is using the RESTful API, this is just a wrapper for local registration on Wazuh Manager.
The manager uses the file
/var/ossec/etc/client.keys to store the registration record of each agent, which includes ID, name, IP, and key. Example:
001 Server1 any e20e0394dca71bacdea57d4ca25d203f836eca12eeca1ec150c2e5f4309a653a 002 ServerProd 220.127.116.11 b0c5548beda537daddb4da698424d0856c3d4e760eaced803d58c07ad1a95f4c 003 DBServer 192.168.0.1/24 8ec4843da9e61647d1ec3facab542acc26bd0e08ffc010086bb3a6fc22f6f65b
The agents also have the file
/var/ossec/etc/client.keys containing only their own registration record. Example for
001 Server1 any e20e0394dca71bacdea57d4ca25d203f836eca12eeca1ec150c2e5f4309a653a
Basic data for registering an agent
In order to register an agent, it is necessary to provide the name and the IP of the agent.
There are several ways to set the agent IP:
- Any IP: Allow the agent to connect from any IP address. Example:
- Fixed IP: Allow the agent to connect only from the specified IP. Example:
ServerProdhas the IP
- Range IP: Allow the agent to connect from the specified range of IPs. Example:
DBServerhas the IP range
Some registration methods automatically detect the IP of the agent during the registration process.
Here are three ways to register an agent:
|Manually||Using the command line||Register an agent manually using manage_agents binary.|
|Automatically||Using the registration service||Register an agent automatically using ossec-authd binary.|
|Using the RESTful API||Register an agent by scripting (bash, python, powershell) and the API.|
If you’re running Wazuh in cluster mode, refer to the Configuring a cluster section to get more details about the registration process in the cluster.