Basic Authentication Plugin

Solr can support Basic authentication for users with the use of the BasicAuthPlugin.

An authorization plugin is also available to configure Solr with permissions to perform various activities in the system. The authorization plugin is described in the section Rule-Based Authorization Plugin.

Enable Basic Authentication

To use Basic authentication, you must first create a security.json file. This file and where to put it is described in detail in the section Enable Plugins with security.json.

For Basic authentication, the security.json file must have an authentication part which defines the class being used for authentication. Usernames and passwords (as a sha256(password+salt) hash) could be added when the file is created, or can be added later with the Basic authentication API, described below.

The authorization part is not related to Basic authentication, but is a separate authorization plugin designed to support fine-grained user access control. For more information, see the section Rule-Based Authorization Plugin.

An example security.json showing both sections is shown below to show how these plugins can work together:

   "blockUnknown": true, 
   "credentials":{"solr":"IV0EHq1OnNrj6gvRCwvFwTrZ1+z1oBbnQdiVC3otuq0= Ndd7LKvVBAaZIF0QAVi1ekCfAJXr1GGfLtRUXhgrF8c="} 

There are several things defined in this file:

1Basic authentication and rule-based authorization plugins are enabled.
2The parameter "blockUnknown":true means that unauthenticated requests are not allowed to pass through.
3A user called 'solr', with a password 'SolrRocks' has been defined.
4The 'admin' role has been defined, and it has permission to edit security settings.
5The 'solr' user has been defined to the 'admin' role.

Save your settings to a file called security.json locally. If you are using Solr in standalone mode, you should put this file in $SOLR_HOME.

If blockUnknown does not appear in the security.json file, it will default to false. This has the effect of not requiring authentication at all. In some cases, you may want this; for example, if you want to have security.json in place but aren’t ready to enable authentication. However, you will want to ensure that this parameter is set to true in order for authentication to be truly enabled in your system.

If you are using SolrCloud, you must upload security.json to ZooKeeper. You can use this example command, ensuring that the ZooKeeper port is correct:

bin/solr zk cp file:path_to_local_security.json zk:/security.json -z localhost:9983
If you have defined ZK_HOST in (see instructions) you can omit -z <zk host string> from the above command.


There are a few things to keep in mind when using the Basic authentication plugin.

  • Credentials are sent in plain text by default. It’s recommended to use SSL for communication when Basic authentication is enabled, as described in the section Enabling SSL.
  • A user who has access to write permissions to security.json will be able to modify all the permissions and how users have been assigned permissions. Special care should be taken to only grant access to editing security to appropriate users.
  • Your network should, of course, be secure. Even with Basic authentication enabled, you should not unnecessarily expose Solr to the outside world.

Editing Authentication Plugin Configuration

An Authentication API allows modifying user IDs and passwords. The API provides an endpoint with specific commands to set user details or delete a user.

API Entry Point

  • v1: http://localhost:8983/solr/admin/authentication
  • v2: http://localhost:8983/api/cluster/security/authentication

This endpoint is not collection-specific, so users are created for the entire Solr cluster. If users need to be restricted to a specific collection, that can be done with the authorization rules.

Add a User or Edit a Password

The set-user command allows you to add users and change their passwords. For example, the following defines two users and their passwords:


curl --user solr:SolrRocks http://localhost:8983/solr/admin/authentication -H 'Content-type:application/json' -d '{"set-user": {"tom":"TomIsCool", "harry":"HarrysSecret"}}'


curl --user solr:SolrRocks http://localhost:8983/api/cluster/security/authentication -H 'Content-type:application/json' -d '{"set-user": {"tom":"TomIsCool", "harry":"HarrysSecret"}}'

Delete a User

The delete-user command allows you to remove a user. The user password does not need to be sent to remove a user. In the following example, we’ve asked that user IDs 'tom' and 'harry' be removed from the system.


curl --user solr:SolrRocks http://localhost:8983/solr/admin/authentication -H 'Content-type:application/json' -d  '{"delete-user": ["tom", "harry"]}'


curl --user solr:SolrRocks http://localhost:8983/api/cluster/security/authentication -H 'Content-type:application/json' -d  '{"delete-user": ["tom", "harry"]}'

Set a Property

Set properties for the authentication plugin. The only currently supported property for the Basic Authentication plugin is blockUnknown.


curl --user solr:SolrRocks http://localhost:8983/solr/admin/authentication -H 'Content-type:application/json' -d  '{"set-property": {"blockUnknown":false}}'


curl --user solr:SolrRocks http://localhost:8983/api/cluster/security/authentication -H 'Content-type:application/json' -d  '{"set-property": {"blockUnknown":false}}'

Using Basic Auth with SolrJ

In SolrJ, the basic authentication credentials need to be set for each request as in this example:

SolrRequest req ;//create a new request object
req.setBasicAuthCredentials(userName, password);

Query example:

QueryRequest req = new QueryRequest(new SolrQuery("*:*"));
req.setBasicAuthCredentials(userName, password);
QueryResponse rsp = req.process(solrClient);

Using the Solr Control Script with Basic Auth

Add the following line to the or file. This example tells the bin/solr command line to to use "basic" as the type of authentication, and to pass credentials with the user-name "solr" and password "SolrRocks":