182 lines
6.9 KiB
Plaintext
182 lines
6.9 KiB
Plaintext
[[pki-realm]]
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=== PKI User Authentication
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You can configure {security} to use Public Key Infrastructure (PKI) certificates
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to authenticate users in {es}. This requires clients to present X.509
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certificates.
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NOTE: You cannot use PKI certificates to authenticate users in {kib}.
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To use PKI in {es}, you configure a PKI realm, enable client authentication on
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the desired network layers (transport or http), and map the Distinguished Names
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(DNs) from the user certificates to {security} roles in the
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<<mapping-roles, role mapping file>>.
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You can also use a combination of PKI and username/password authentication. For
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example, you can enable SSL/TLS on the transport layer and define a PKI realm to
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require transport clients to authenticate with X.509 certificates, while still
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authenticating HTTP traffic using username and password credentials. You can also set
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`xpack.security.transport.ssl.client_authentication` to `optional` to allow clients without
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certificates to authenticate with other credentials.
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IMPORTANT: You must enable SSL/TLS and enabled client authentication to use PKI.
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For more information, see <<ssl-tls, Setting Up SSL/TLS on a Cluster>>.
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==== PKI Realm Configuration
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Like other realms, you configure options for a `pki` realm under the
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`xpack.security.authc.realms` namespace in `elasticsearch.yml`.
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To configure a `pki` realm:
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. Add a realm configuration of type `pki` to `elasticsearch.yml` under the
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`xpack.security.authc.realms` namespace. At a minimum, you must set the realm `type` to
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`pki`. If you are configuring multiple realms, you should also explicitly set
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the `order` attribute. See <<pki-settings>> for all of the options you can set
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for a `pki` realm.
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+
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For example, the following snippet shows the most basic `pki` realm configuration:
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[source, yaml]
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------------------------------------------------------------
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xpack:
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security:
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authc:
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realms:
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pki1:
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type: pki
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------------------------------------------------------------
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+
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With this configuration, any certificate trusted by the SSL/TLS layer is accepted
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for authentication. The username is the common name (CN) extracted from the DN
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of the certificate.
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IMPORTANT: When you configure realms in `elasticsearch.yml`, only the
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realms you specify are used for authentication. If you also want to use the
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`native` or `file` realms, you must include them in the realm chain.
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+
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If you want to use something other than the CN of the DN as the username, you
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can specify a regex to extract the desired username. For example, the regex in
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the following configuration extracts the email address from the DN:
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+
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[source, yaml]
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------------------------------------------------------------
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xpack:
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security:
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authc:
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realms:
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pki1:
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type: pki
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username_pattern: "EMAILADDRESS=(.*?)(?:,|$)"
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------------------------------------------------------------
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+
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. Restart Elasticsearch.
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[[pki-ssl-config]]
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==== PKI and SSL Settings
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The PKI realm relies on the SSL settings of the node's network interface
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(transport or http). The realm can be configured to be more restrictive than
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the underlying network connection - that is, it is possible to configure the
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node such that some connections are accepted by the network interface but then
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fail to be authenticated by the PKI realm. However the reverse is not possible
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- the PKI realm cannot authenticate a connection that has been refused by the
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network interface.
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In particular this means:
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* The transport or http interface must request client certificates by setting
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`client_authentication` to `optional` or `required`.
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* The interface must _trust_ the certificate that is presented by the client
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by configuring either the `truststore` or `certificate_authorities` paths,
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or by setting `verification_mode` to `none`.
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* The _protocols_ supported by the interface must be compatible with those
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used by the client.
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The relevant network interface (transport or http) must be configured to trust
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any certificate that is to be used within the PKI realm. However it possible to
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configure the PKI realm to trust only a _subset_ of the certificates accepted
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by the network interface.
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This is useful when the SSL/TLS layer trusts clients with certificates that are
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signed by a different CA than the one that signs your users' certificates.
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To configure the PKI realm with its own truststore, specify the
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`truststore.path` option as below:
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[source, yaml]
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------------------------------------------------------------
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xpack:
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security:
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authc:
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realms:
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pki1:
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type: pki
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truststore:
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path: "/path/to/pki_truststore.jks"
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password: "x-pack-test-password"
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------------------------------------------------------------
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The `certificate_authorities` option may be used as an alternative to the
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`truststore.path` setting.
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[[pki-settings]]
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===== PKI Realm Settings
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See
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{ref}/security-settings.html#_settings_valid_for_all_realms[Security Settings for All Realms]
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and
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{ref}/security-settings.html#ref-pki-settings[PKI Realm Settings].
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[[assigning-roles-pki]]
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==== Mapping Roles for PKI Users
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You map roles for PKI users through the
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{ref}/security-api-role-mapping.html[role-mapping API], or by using a file stored on
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each node. When a user authenticates against a PKI realm, the privileges for
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that user are the union of all privileges defined by the roles to which the
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user is mapped.
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You identify a user by the distinguished name in their certificate.
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For example, the following mapping configuration maps `John Doe` to the
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`user` role:
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Using the role-mapping API:
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[source,js]
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--------------------------------------------------
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PUT _xpack/security/role_mapping/users
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{
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"roles" : [ "user" ],
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"rules" : { "field" : {
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"dn" : "cn=John Doe,ou=example,o=com" <1>
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} },
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"enabled": true
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}
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--------------------------------------------------
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// CONSOLE
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<1> The distinguished name (DN) of a PKI user.
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Or, alternatively, configured in a role-mapping file:
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[source, yaml]
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------------------------------------------------------------
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user: <1>
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- "cn=John Doe,ou=example,o=com" <2>
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------------------------------------------------------------
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<1> The name of a role.
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<2> The distinguished name (DN) of a PKI user.
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The disinguished name for a PKI user follows X.500 naming conventions which
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place the most specific fields (like `cn` or `uid`) at the beginning of the
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name, and the most general fields (like `o` or `dc`) at the end of the name.
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Some tools, such as _openssl_, may print out the subject name in a different
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format.
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One way that you can determine the correct DN for a certificate is to use the
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{ref}/security-api-authenticate.html[authenticate API] (use the relevant PKI
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certificate as the means of authentication) and inspect the metadata field in
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the result. The user's distinguished name will be populated under the `pki_dn`
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key. You can also use the authenticate API to validate your role mapping.
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For more information, see <<mapping-roles, Mapping Users and Groups to Roles>>.
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