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Grant Right to Use $Eval on MongoDB 3.2

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Grant Right to Use $Eval on MongoDB 3.2

How do you enable a user to execute the $eval command in MongoDB? You might not think this is an issue, but you might also be surprised. Read on to find out more.

· Database Zone
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Learn how to move from MongoDB to Couchbase Server for consistent high performance in distributed environments at any scale.

One of the side effects of enabling authorization on MongoDB is that, even if you create a user with “root” right, this account is not able to execute the $eval command. The symptom is, when you try to execute $eval you get this error:

mongodb Command '$eval' failed: not authorized on jarvis-framework-saga-test to execute command

This happens because $eval is somewhat deprecated, and it should not be used. Since it is a dangerous command, a user should have access to all action on all resources, and you need to create a role that has anyAction on anyResource.

If you really need to use $eval, you should create a role. Just connect to the admin database and create a new role with the command.

db.createRole( 
{ 
role: "executeEval", 
privileges: [ { 
resource: { anyResource: true }, 
actions: [ "anyAction" ] } ], 
roles: []
 } ) 

Now that you have this new role, just add it to all the users that need to use $eval. As an example, if you have a single admin user in the admin database, just run this against the admin DB.

db.grantRolesToUser("admin", [ { role: "executeFunctions", db: "admin" } ])

And now, the admin user can execute $eval against all databases.

Want to deliver a whole new level of customer experience? Learn how to make your move from MongoDB to Couchbase Server.

Topics:
mongodb ,database ,authorization ,users ,permissions

Published at DZone with permission of Ricci Gian Maria, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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