2022 Linux Agent Key Rotation

As a common best practice, Datadog periodically rotates the keys and certificates used to sign Datadog’s Agent packages. The following GPG keys, used to sign the Agent RPM and DEB packages, reach their end-of-life in June 2022 and will be rotated in April 2022:

Customers using Datadog’s RPM or DEB packages might require a manual action to import the new key on their systems to install or upgrade the Agent after the rotation takes place.

Note: This DOES NOT affect the functionality of already running Agents, and only limits the ability to install or upgrade to a newer version of the Agent. Also, this doesn't affect Dockerized Linux Agents, Windows, or macOS Agents.

Install methods that automatically trust the new GPG key

Your host automatically trusts the new key (no further action is required) if you’re using one of the following install methods:

Additionally, installing the DEB Agent v6.35.1+ or v7.35.1+ package through apt from the apt.datadoghq.com repository installs the datadog-signing-keys package version 1.1.0, which automatically ensures that your host trusts the new key. If you have datadog-signing-keys version 1.1.0 or later installed, no further action is needed. Versions of datadog-signing-keys older than version 1.1.0 don’t guarantee full preparedness for the key rotation.

If you are installing the DEB Agent package from a different repository or you are not using apt (or a similar tool that checks repo metadata signatures), your system doesn’t need to know the Datadog signing keys (no further action is needed). However, you may benefit from the datadog-signing-keys package.

If you’re unsure if a host trusts the new signing key, you can check.

For hosts running older versions of the install methods listed above or older versions of the DEB package, Datadog recommends updating the install method to the latest version. Alternatively Debian and Ubuntu users can update the Agent to version 7.31.0+. Otherwise, the key can be manually updated.

What happens if I don’t trust the new key before it is rotated?

Trying to install or upgrade Agent packages using apt, yum, dnf or zypper from apt.datadoghq.com/yum.datadoghq.com without trusting the new key results in an error.

Possible errors include:

E: The repository 'https://apt.datadoghq.com stable Release' is not signed.
E: Package 'datadog-agent' has no installation candidate
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY
The GPG keys listed for the "Datadog, Inc." repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.
Public key for datadog-agent-7.35.1-1.x86_64.rpm is not installed. Failing package is: datadog-agent-1:7.35.1-1.x86_64
Error: GPG check FAILED

For apt, this applies to both newly released and existing versions of the Agent. For yum, dnf or zypper, existing versions of the Agent can still be installed as long as repo_gpgcheck=0 is set in the datadog.repo file.

This key rotation does not affect installations done by manually downloading the packages and installing them with dpkg or rpm. This may cause a warning for rpm.

Manual update

Datadog encourages you to use one of the install methods above, which trust the new GPG key as well as all future keys automatically. If this is not an option, use the following instructions to manually download and trust the new key.

Run the following commands on the host:

$ curl -o /tmp/DATADOG_APT_KEY_F14F620E https://keys.datadoghq.com/DATADOG_APT_KEY_F14F620E.public
$ sudo apt-key add /tmp/DATADOG_APT_KEY_F14F620E
$ sudo touch /usr/share/keyrings/datadog-archive-keyring.gpg
$ cat /tmp/DATADOG_APT_KEY_F14F620E | sudo gpg --import --batch --no-default-keyring --keyring /usr/share/keyrings/datadog-archive-keyring.gpg
$ sudo chmod a+r /usr/share/keyrings/datadog-archive-keyring.gpg

Run the following commands on the host:

$ curl -o /tmp/DATADOG_RPM_KEY_FD4BF915 https://keys.datadoghq.com/DATADOG_RPM_KEY_FD4BF915.public
$ sudo rpm --import /tmp/DATADOG_RPM_KEY_FD4BF915

Check if a host trusts the new GPG key

A host correctly trusts the new key if either one of these conditions is true:

  • The file /usr/share/keyrings/datadog-archive-keyring.gpg exists and the Datadog source list file (usually /etc/apt/sources.list.d/datadog.list) contains the option [signed-by=/usr/share/keyrings/datadog-archive-keyring.gpg].
  • The Datadog source list file doesn’t contain the signed-by option, but datadog-signing-keys version 1.1.0 or later is installed, which results in the presence of a /etc/apt/trusted.gpg.d/datadog-archive-keyring.gpg file.

Files /usr/share/keyrings/datadog-archive-keyring.gpg and, optionally, /etc/apt/trusted.gpg.d/datadog-archive-keyring.gpg are created either by a supported installation method or by installing the datadog-signing-keys package. Ensure that datadog-signing-keys version 1.1.0 or later is installed unless using one of the installation method versions listed above.

Run the following command on the host:

$ rpm -qa | grep gpg-pubkey-fd4bf915

If the key is trusted, the command has a 0 exit code and outputs:

gpg-pubkey-fd4bf915-5f573efe

Otherwise, the command returns a non-0 exit code with no output.

Alternatively, check if your datadog.repo file contains https://keys.datadoghq.com/DATADOG_RPM_KEY_CURRENT.public as one of the gpgkey entries. This key file will be updated with the new key as soon as it is in use.

The datadog-signing-keys package

Note: This section only applies to DEB Agent package users.

Since Agent v6.31.0 and v7.31.0, all Datadog DEB packages have a soft dependency on the datadog-signing-keys package. Since Agent v6.35.1 and v 7.35.1, all Datadog DEB packages have a soft dependency on the datadog-signing-keys package version 1.1.0.

Upon installation, this package:

  • Configures APT keys in the /usr/share/keyrings/datadog-archive-keyring.gpg keyring and also in /etc/apt/trusted.gpg.d/datadog-archive-keyring.gpg when necessary. This ensures that the upcoming APT repository signing key is trusted. Using the package datadog-signing-keys version 1.1.0 is recommended to ensure preparedness for the upcoming key rotation.
  • Sets up a debsig-verify policy for Datadog packages. This allows you to verify signatures for individual DEB packages locally.

For example, to verify that a locally downloaded DEB package was built and signed by Datadog, run the following command:

$ debsig-verify datadog-dogstatsd_7.34.0-1_amd64.deb

If the verification is successful, debsig-verify exits with status 0 and prints a message: debsig: Verified package from 'Datadog, Inc.' (Datadog).. Datadog’s DEB packages embed signatures since v6.26.0/7.26.0, so this verification does not work on earlier versions.

Because the Agent v6.31.0+/7.31.0+’s package dependency on datadog-signing-keys is optional, it may not install if:

  • You manually download the Agent DEB package and install it without having the Datadog repository configured as an APT source.
  • You mirror the Agent DEB package to your own APT repository without also mirroring the datadog-signing-keys package.
  • Your APT configuration is set to not install recommended packages. For example, by running apt with --no-install-recommends or by having APT::Install-Recommends "0" in apt.conf.

The first two methods do not require verification for Datadog’s repo metadata, so the key rotation has no impact. However, you may benefit from using the debsig-verify policy files shipped in the datadog-signing-keys package.

With the third method, you need to explicitly install the datadog-signing-keys package if you are installing the Agent package from apt.datadoghq.com through apt. Alternatively, use one of the supported installation methods.

datadog-signing-keys version 1.1.0

Note: This section only applies to DEB Agent package users.

datadog-signing-keys versions before 1.1.0 do not handle the following corner cases:

  • On Ubuntu >= 16 and Debian >= 9, only /usr/share/keyrings/datadog-archive-keyring.gpg was created, but /etc/apt/trusted.gpg.d/datadog-archive-keyring.gpg was not.
  • If the APT source list file (e.g. /etc/apt/sources.list.d/datadog.list) does not contain the option [signed-by=/usr/share/keyrings/datadog-archive-keyring.gpg], APT never knows about the new key. Any operations with the Datadog repository will fail after the key rotation.

datadog-signing-keys version 1.1.0 addresses this issue by creating /etc/apt/trusted.gpg.d/datadog-archive-keyring.gpg when /etc/apt/sources.list.d/datadog.list doesn’t contain the proper signed-by option. This ensures that the above corner case is covered as well.

Users of supported up-to-date installation methods using the default Datadog sources always have the proper signed-by option configured, so they are not affected by this issue. Datadog highly recommends that all other users to upgrade to datadog-signing-keys 1.1.0 to ensure preparedness for the upcoming key rotation. Installing DEB Agent v6.35.1+ or v7.35.1+ through apt from the apt.datadoghq.com repository ensures that datadog-signing-keys 1.1.0 is installed.

Impact for Agent v5 users

Agent v5 users on DEB-based systems (Debian/Ubuntu) are also required to trust the new signing key to install or upgrade the Agent after the rotation date. Agent v5 users on RPM-based systems (RedHat/CentOS/SUSE) are not affected by this rotation.

Note: Agent v5 uses Python 2 which reached end-of-life on January 1, 2021. Datadog recommends upgrading to Agent v7.