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Export Teleport Audit Events to Panther

Panther is a cloud-native security analytics platform. In this guide, we'll explain how to forward Teleport audit events to Panther using Fluentd.

How it works​

The Teleport Event Handler is designed to communicate with Fluentd using mTLS to establish a secure channel. In this setup, the Event Handler sends events to Fluentd, which forwards them to S3 to be ingested by Panther.

Architecture of the setup shown in this guide

Prerequisites​

  • A running Teleport cluster version 15.4.22 or above. If you want to get started with Teleport, sign up for a free trial or set up a demo environment.

  • The tctl admin tool and tsh client tool.

    On Teleport Enterprise, you must use the Enterprise version of tctl, which you can download from your Teleport account workspace. Otherwise, visit Installation for instructions on downloading tctl and tsh for Teleport Community Edition.

Recommended: Configure Machine ID to provide short-lived Teleport credentials to the plugin. Before following this guide, follow a Machine ID deployment guide to run the tbot binary on your infrastructure.

  • A Panther account.
  • A server, virtual machine, Kubernetes cluster, or Docker environment to run the Event Handler. The instructions below assume a local Docker container for testing.
  • Fluentd version v1.12.4 or greater. The Teleport Event Handler will create a new fluent.conf file you can integrate into an existing Fluentd system, or use with a fresh setup.
  • An S3 bucket to store the logs. Panther will ingest the logs from this bucket.

The instructions below demonstrate a local test of the Event Handler plugin on VM. You will need to adjust paths, ports, and domains for other environments.

  • To check that you can connect to your Teleport cluster, sign in with tsh login, then verify that you can run tctl commands using your current credentials. tctl is supported on macOS and Linux machines. For example: 
    $ tsh login --proxy=teleport.example.com --user=email@example.com
    $ tctl status
    # Cluster  teleport.example.com
    # Version  15.4.22
    # CA pin   sha256:abdc1245efgh5678abdc1245efgh5678abdc1245efgh5678abdc1245efgh5678
    If you can connect to the cluster and run the tctl status command, you can use your current credentials to run subsequent tctl commands from your workstation. If you host your own Teleport cluster, you can also run tctl commands on the computer that hosts the Teleport Auth Service for full permissions.

Step 1/7. Install the Event Handler plugin​

The Teleport event handler runs alongside the Fluentd forwarder, receives events from Teleport's events API, and forwards them to Fluentd.

$ curl -L -O https://get.gravitational.com/teleport-event-handler-v15.4.22-linux-amd64-bin.tar.gz
$ tar -zxvf teleport-event-handler-v15.4.22-linux-amd64-bin.tar.gz
$ sudo ./teleport-event-handler/install

We currently only build the Event Handler plugin for amd64 machines. For ARM architecture, you can build from source.

Step 2/7. Generate a plugin configuration​

Run the configure command to generate a sample configuration. Replace mytenant.teleport.sh with the DNS name of your Teleport Enterprise Cloud tenant:

$ teleport-event-handler configure . mytenant.teleport.sh:443

You'll see the following output:

Teleport event handler 15.4.22

[1] mTLS Fluentd certificates generated and saved to ca.crt, ca.key, server.crt, server.key, client.crt, client.key
[2] Generated sample teleport-event-handler role and user file teleport-event-handler-role.yaml
[3] Generated sample fluentd configuration file fluent.conf
[4] Generated plugin configuration file teleport-event-handler.toml

The plugin generates several setup files:

$ ls -l
# -rw------- 1 bob bob     1038 Jul  1 11:14 ca.crt
# -rw------- 1 bob bob     1679 Jul  1 11:14 ca.key
# -rw------- 1 bob bob     1042 Jul  1 11:14 client.crt
# -rw------- 1 bob bob     1679 Jul  1 11:14 client.key
# -rw------- 1 bob bob      541 Jul  1 11:14 fluent.conf
# -rw------- 1 bob bob     1078 Jul  1 11:14 server.crt
# -rw------- 1 bob bob     1766 Jul  1 11:14 server.key
# -rw------- 1 bob bob      260 Jul  1 11:14 teleport-event-handler-role.yaml
# -rw------- 1 bob bob      343 Jul  1 11:14 teleport-event-handler.toml
File(s)Purpose
ca.crt and ca.keySelf-signed CA certificate and private key for Fluentd
server.crt and server.keyFluentd server certificate and key
client.crt and client.keyFluentd client certificate and key, all signed by the generated CA
teleport-event-handler-role.yamluser and role resource definitions for Teleport's event handler
fluent.confFluentd plugin configuration
Running the Event Handler separately from the log forwarder

This guide assumes that you are running the Event Handler on the same host or Kubernetes pod as your log forwarder. If you are not, you will need to instruct the Event Handler to generate mTLS certificates for subjects besides localhost. To do this, use the --cn and --dns-names flags of the teleport-event-handler configure command.

For example, if your log forwarder is addressable at forwarder.example.com and the Event Handler at handler.example.com, you would run the following configure command:

$ teleport-event-handler configure --cn=handler.example.com --dns-names=forwarder.example.com

The command generates client and server certificates with the subjects set to the value of --cn.

The --dns-names flag accepts a comma-separated list of DNS names. It will append subject alternative names (SANs) to the server certificate (the one you will provide to your log forwarder) for each DNS name in the list. The Event Handler looks up each DNS name before appending it as an SAN and exits with an error if the lookup fails.

Step 3/7. Create a user and role for reading audit events​

The teleport-event-handler configure command generated a file called teleport-event-handler-role.yaml. This file defines a teleport-event-handler role and a user with read-only access to the event API:

kind: role
metadata:
  name: teleport-event-handler
spec:
  allow:
    rules:
      - resources: ['event', 'session']
        verbs: ['list','read']
version: v5
---
kind: user
metadata:
  name: teleport-event-handler
spec:
  roles: ['teleport-event-handler']
version: v2

Move this file to your workstation (or recreate it by pasting the snippet above) and use tctl on your workstation to create the role and the user:

$ tctl create -f teleport-event-handler-role.yaml
# user "teleport-event-handler" has been created
# role 'teleport-event-handler' has been created

Step 4/7. Create teleport-event-handler credentials​

Enable issuing of credentials for the Event Handler role​

With the role created, you now need to allow the Machine ID bot to produce credentials for this role.

This can be done with tctl, replacing my-bot with the name of your bot:

$ tctl bots update my-bot --add-roles teleport-event-handler

Export an identity file for the Event Handler plugin user​

Give the plugin access to a Teleport identity file. We recommend using Machine ID for this in order to produce short-lived identity files that are less dangerous if exfiltrated, though in demo deployments, you can generate longer-lived identity files with tctl:

Configure tbot with an output that will produce the credentials needed by the plugin. As the plugin will be accessing the Teleport API, the correct output type to use is identity.

For this guide, the directory destination will be used. This will write these credentials to a specified directory on disk. Ensure that this directory can be written to by the Linux user that tbot runs as, and that it can be read by the Linux user that the plugin will run as.

Modify your tbot configuration to add an identity output.

If running tbot on a Linux server, use the directory output to write identity files to the /opt/machine-id directory:

outputs:
- type: identity
  destination:
    type: directory
    # For this guide, /opt/machine-id is used as the destination directory.
    # You may wish to customize this. Multiple outputs cannot share the same
    # destination.
    path: /opt/machine-id

If running tbot on Kubernetes, write the identity file to Kubernetes secret instead:

outputs:
  - type: identity
    destination:
      type: kubernetes_secret
      name: teleport-event-handler-identity

If operating tbot as a background service, restart it. If running tbot in one-shot mode, execute it now.

You should now see an identity file under /opt/machine-id or a Kubernetes secret named teleport-event-handler-identity. This contains the private key and signed certificates needed by the plugin to authenticate with the Teleport Auth Service.

Step 5/7. Create a Dockerfile with Fluentd and the S3 plugin​

To send logs to Panther, you need to use the Fluentd output plugin for S3. Create a Dockerfile with the following content:

FROM fluent/fluentd:edge
USER root
RUN fluent-gem install fluent-plugin-s3
USER fluent

Build the Docker image:

$ docker build -t fluentd-s3 .
Testing Locally?

If you're running Fluentd in a local Docker container for testing, you can adjust the entrypoint to an interactive shell as the root user, so you can test the setup.

$ docker run -u $(id -u root):$(id -g root) -p 8888:8888 -v $(pwd):/keys -v \
$(pwd)/fluent.conf:/fluentd/etc/fluent.conf --entrypoint=/bin/sh -i --tty  fluentd-s3

Configure Fluentd for Panther​

When you run the Teleport Event Handler, it will create a fluent.conf file. This file needs to be updated to send logs to Panther. This means adding a <filter> and <match> section to the file. These sections will filter and format the logs before sending them to S3, The record_transformer is important to send the right date and time format for Panther.

<!--
# Below code is commented out as it's autogenerated in step 4 by teleport-event-handler
fluent.conf 
This is a sample configuration file for Fluentd to send logs to S3. 
Created by the Teleport Event Handler plugin. 
Add the <filter> and <match> sections to the file.
 <source>
     @type http
     port 8888

     <transport tls>
         client_cert_auth true
         ca_path "/keys/ca.crt"
         cert_path "/keys/server.crt"
         private_key_path "/keys/server.key"
         private_key_passphrase "AUTOGENERATED"
     </transport>

     <parse>
       @type json
       json_parser oj

       # This time format is used by Teleport Event Handler.
       time_type string
       time_format %Y-%m-%dT%H:%M:%S
     </parse>

     # If the number of events is high, fluentd will start failing the ingestion
     # with the following error message: buffer space has too many data errors.
     # The following configuration prevents data loss in case of a restart and
     # overcomes the limitations of the default fluentd buffer configuration.
     # This configuration is optional.
     # See https://docs.fluentd.org/configuration/buffer-section for more details.
     <buffer>
       @type file
       flush_thread_count 8
       flush_interval 1s
       chunk_limit_size 10M
       queue_limit_length 16
       retry_max_interval 30
       retry_forever true
  </buffer>
</source>
-->
<filter test.log>
  @type record_transformer
  enable_ruby true
  <record>
    time ${time.utc.strftime("%Y-%m-%dT%H:%M:%SZ")}
  </record>
</filter>
<match test.log>
  @type s3
  aws_key_id  REPLACE_aws_access_key
  aws_sec_key  REPLACE_aws_secret_access_key
  s3_bucket  REPLACE_s3_bucket
  s3_region us-west-2
  path teleport/logs
  <buffer>
    @type file
    path /var/log/fluent/buffer/s3-events
    timekey 60
    timekey_wait 0
    timekey_use_utc true
    chunk_limit_size 256m
  </buffer>
  time_slice_format %Y%m%d%H%M%S
  <format>
    @type json
    </format>
</match>
<match session.*>
  @type stdout
</match>

Start the Fluentd container:

$ docker run -p 8888:8888 -v $(pwd):/keys -v $(pwd)/fluent.conf:/fluentd/etc/fluent.conf fluentd-s3

This will start the Fluentd container and expose port 8888 for the Teleport Event Handler to send logs to.

Step 6/7. Run the Teleport Event Handler plugin​

Configure the Event Handler​

In this section, you will configure the Teleport Event Handler for your environment.

Earlier, we generated a file called teleport-event-handler.toml to configure the Fluentd event handler. This file includes setting similar to the following:

storage = "./storage"
timeout = "10s"
batch = 20
namespace = "default"
# The window size configures the duration of the time window for the event handler
# to request events from Teleport. By default, this is set to 24 hours.
# Reduce the window size if the events backend cannot manage the event volume 
# for the default window size.
# The window size should be specified as a duration string, parsed by Go's time.ParseDuration.
window-size = "24h"

[forward.fluentd]
ca = "/home/bob/event-handler/ca.crt"
cert = "/home/bob/event-handler/client.crt"
key = "/home/bob/event-handler/client.key"
url = "https://fluentd.example.com:8888/test.log"
session-url = "https://fluentd.example.com:8888/session"

[teleport]
addr = "example.teleport.com:443"
identity = "identity"

Modify the configuration to replace fluentd.example.com with the domain name of your Fluentd deployment.

Next, modify the configuration file as follows:

addr: Include the hostname and HTTPS port of your Teleport Proxy Service or Teleport Enterprise Cloud account (e.g., teleport.example.com:443 or mytenant.teleport.sh:443).

identity: Fill this in with the path to the identity file you exported earlier.

client_key, client_crt, root_cas: Comment these out, since we are not using them in this configuration.

If you are providing credentials to the Event Handler using a tbot binary that runs on a Linux server, make sure the value of identity in the Event Handler configuration is the same as the path of the identity file you configured tbot to generate, /opt/machine-id/identity.

Start the Teleport Event Handler​

Start the Teleport Teleport Event Handler by following the instructions below.

Copy the teleport-event-handler.toml file to /etc on your Linux server. Update the settings within the toml file to match your environment. Make sure to use absolute paths on settings such as identity and storage. Files and directories in use should only be accessible to the system user executing the teleport-event-handler service such as /var/lib/teleport-event-handler.

Next, create a systemd service definition at the path /usr/lib/systemd/system/teleport-event-handler.service with the following content:

[Unit]
Description=Teleport Event Handler
After=network.target

[Service]
Type=simple
Restart=always
ExecStart=/usr/local/bin/teleport-event-handler start --config=/etc/teleport-event-handler.toml --teleport-refresh-enabled=true
ExecReload=/bin/kill -HUP $MAINPID
PIDFile=/run/teleport-event-handler.pid

[Install]
WantedBy=multi-user.target

If you are not using Machine ID to provide short-lived credentials to the Event Handler, you can remove the --teleport-refresh-enabled true flag.

Enable and start the plugin:

$ sudo systemctl enable teleport-event-handler
$ sudo systemctl start teleport-event-handler
Choose when to start exporting events

You can configure when you would like the Teleport Event Handler to begin exporting events when you run the start command. This example will start exporting from May 5th, 2021:

$ teleport-event-handler start --config /etc/teleport-event-handler.toml --start-time "2021-05-05T00:00:00Z"

You can only determine the start time once, when first running the Teleport Event Handler. If you want to change the time frame later, remove the plugin state directory that you specified in the storage field of the handler's configuration file.

Once the Teleport Event Handler starts, you will see notifications about scanned and forwarded events:

$ sudo journalctl -u teleport-event-handler
DEBU   Event sent id:f19cf375-4da6-4338-bfdc-e38334c60fd1 index:0 ts:2022-09-21
18:51:04.849 +0000 UTC type:cert.create event-handler/app.go:140
...

The Logs view in Panther should now report your Teleport cluster events.

Step 7/7. Configure Panther to ingest logs from S3​

Once logs are being sent to S3, you can configure Panther to ingest them. Follow the Panther documentation to set up the S3 bucket as a data source.

Panther Dashboard Example

Troubleshooting connection issues​

If the Teleport Event Handler is displaying error logs while connecting to your Teleport Cluster, ensure that:

  • The certificate the Teleport Event Handler is using to connect to your Teleport cluster is not past its expiration date. This is the value of the --ttl flag in the tctl auth sign command, which is 12 hours by default.
  • Ensure that in your Teleport Event Handler configuration file (teleport-event-handler.toml), you have provided the correct host and port for the Teleport Proxy Service.
  • Start the FluentD container prior to starting the Teleport Event Handler. The Event Handler will attempt to connect to FluentD immediately upon startup.

Next steps​