The Federal Information Processing Standard (FIPS) Publication 140-2, (FIPS PUB 140-2), titled "Security Requirements for Cryptographic Modules" is a U.S. government computer security standard used to approve cryptographic modules. Elasticsearch offers a FIPS 140-2 compliant mode and as such can run in a FIPS 140-2 configured JVM.
The JVM bundled with Elasticsearch is not configured for FIPS 140-2. You must either configure the bundled JVM to run with a FIPS 140-2 certified Java Security Provider or use an external JVM configured for FIPS 140-2.
After configuring your JVM for FIPS 140-2, you can run Elasticsearch in FIPS mode by
For Elasticsearch, adherence to FIPS 140-2 is ensured by
- Using FIPS approved / NIST recommended cryptographic algorithms.
- Delegating the implementation of these cryptographic algorithms to a NIST validated cryptographic module (available via the Java Security Provider in use in the JVM).
- Allowing the configuration of Elasticsearch in a FIPS 140-2 compliant manner, as documented below.
If you plan to upgrade your existing cluster to a version that can be run in a FIPS 140-2 configured JVM, we recommend to first perform a rolling upgrade to the new version in your existing JVM and perform all necessary configuration changes in preparation for running in fips mode. You can then perform a rolling restart of the nodes, starting each node in a FIPS 140-2 JVM. During the restart, Elasticsearch:
- Upgrades secure settings to the latest, compliant format. A FIPS 140-2 JVM cannot load previous format versions. If your keystore is not password-protected, you must manually set a password. See Elasticsearch Keystore.
- Upgrades self-generated trial licenses to the latest FIPS 140-2 compliant format.
If your subscription already supports FIPS 140-2 mode, you
can elect to perform a rolling upgrade while at the same time running each
upgraded node in a FIPS 140-2 JVM. In this case, you would need to also manually
elasticsearch.keystore and migrate all secure settings to it,
in addition to the necessary configuration changes outlined below, before
starting each node.
Configuring Elasticsearch for FIPS 140-2edit
Apart from setting
xpack.security.fips_mode.enabled, a number of security
related settings need to be configured accordingly in order to be compliant
and able to run Elasticsearch successfully in a FIPS 140-2 configured JVM.
FIPS 140-2 (via NIST Special Publication 800-132) dictates that encryption keys should at least have an effective strength of 112 bits. As such, the elasticsearch keystore that stores the node’s secure settings needs to be password protected with a password that satisfies this requirement. This means that the password needs to be 14 bytes long which is equivalent to a 14 character ASCII encoded password, or a 7 character UTF-8 encoded password. You can use the elasticsearch-keystore passwd subcommand to change or set the password of an existing keystore. Note that when the keystore is password-protected, you must supply the password each time Elasticsearch starts.
SSLv2 and SSLv3 are not allowed by FIPS 140-2, so
be used for
The use of TLS ciphers is mainly governed by the relevant crypto module
(the FIPS Approved Security Provider that your JVM uses). All the ciphers that
are configured by default in Elasticsearch are FIPS 140-2 compliant and as such can be
used in a FIPS 140-2 JVM. See
TLS keystores and keysedit
Keystores can be used in a number of General TLS settings in order to
conveniently store key and trust material. Neither
can be used in a FIPS 140-2 configured JVM. Avoid using
these types of keystores. Your FIPS 140-2 provider may provide a compliant keystore
implementation that can be used, or you can use PEM encoded files. To use PEM encoded
key material, you can use the relevant
options, and for trust material you can use
FIPS 140-2 compliance dictates that the length of the public keys used for TLS
must correspond to the strength of the symmetric key algorithm in use in TLS.
Depending on the value of
ssl.cipher_suites that you select to use, the TLS
keys must have corresponding length according to the following table:
Table 76. Comparable key strengths
Symmetric Key Algorithm
RSA key Length
ECC key length
Stored password hashingedit
While Elasticsearch offers a number of algorithms for securely hashing credentials
on disk, only the
PBKDF2 based family of algorithms is compliant with FIPS
140-2 for stored password hashing. However, since
PBKDF2 is essentially a key derivation
function, your JVM security provider may enforce a
112-bit key strength requirement. Although FIPS 140-2
does not mandate user password standards, this requirement may affect password
hashing in Elasticsearch. To comply with this requirement,
while allowing you to use passwords that satisfy your security policy, Elasticsearch offers
pbkdf2_stretch which is the suggested hashing algorithm when running
Elasticsearch in FIPS 140-2 environments.
pbkdf2_stretch performs a single round of SHA-512
on the user password before passing it to the
You can still use one of the plain
pbkdf2 options instead of
you have external policies and tools that can ensure all user passwords for the reserved,
native, and file realms are longer than 14 bytes.
You must set the
xpack.security.authc.password_hashing.algorithm setting to one of the
See User cache and password hash algorithms.
Password hashing configuration changes are not retroactive so the stored hashed credentials of existing users of the reserved, native, and file realms are not updated on disk. To ensure FIPS 140-2 compliance, recreate users or change their password using the elasticsearch-user CLI tool for the file realm and the create users and change password APIs for the native and reserved realms. Other types of realms are not affected and do not require any changes.
Cached password hashingedit
sha256) is recommended for cache hashing. Though
PBKDF2 is compliant with FIPS-140-2, it is — by design — slow, and
thus not generally suitable as a cache hashing algorithm. Cached
credentials are never stored on disk, and salted
sha256 provides an
adequate level of security for in-memory credential hashing, without
imposing prohibitive performance overhead. You may use
however you should carefully assess performance impact first. Depending
on your deployment, the overhead of
PBKDF2 could undo most of the
performance gain of using a cache.
Either set all
cache.hash_algo settings to
ssha256 or leave
them undefined, since
ssha256 is the default value for all
cache.hash_algo settings. See User cache and password hash algorithms.
The user cache will be emptied upon node restart, so any existing hashes using non-compliant algorithms will be discarded and the new ones will be created using the algorithm you have selected.
Due to the limitations that FIPS 140-2 compliance enforces, a small number of features are not available while running in FIPS 140-2 mode. The list is as follows:
- Azure Classic Discovery Plugin
- Ingest Attachment Plugin
elasticsearch-certutilcan very well be used in a non FIPS 140-2 configured JVM (pointing
ES_JAVA_HOMEenvironment variable to a different java installation) in order to generate the keys and certificates that can be later used in the FIPS 140-2 configured JVM.
- The SQL CLI client cannot run in a FIPS 140-2 configured JVM while using TLS for transport security or PKI for client authentication.