abraunegg-onedrive/docs/application-security.md

OneDrive Client for Linux Application Security

This document details the application security used, and provides details for users on changing these security options.

There are 2 main components regarding security for this application:

• Azure Application Permissions
• User Authentication Permissions

Default Application Security

Security options should follow the security principal of 'least privilege':

The principle that a security architecture should be designed so that each entity is granted the minimum system resources and authorizations that the entity needs to perform its function.

Reference: https://csrc.nist.gov/glossary/term/least_privilege

As such, the following API permissions are used by default:

Default Azure Application Permissions

API / Permissions name	Type	Description	Admin consent required
Files.Read	Delegated	Have read-only access to user files	No
Files.Read.All	Delegated	Have read-only access to all files user can access	No
Sites.Read.All	Delegated	Have read-only access to all items in all site collections	No
offline_access	Delegated	Maintain access to data you have given it access to	No

Default User Authentication Permissions

API / Permissions name	Type	Description	Admin consent required
Files.ReadWrite	Delegated	Have full access to user files	No
Files.ReadWrite.All	Delegated	Have full access to all files user can access	No
Sites.ReadWrite.All	Delegated	Have full access to all items in all site collections	No
offline_access	Delegated	Maintain access to data you have given it access to	No

When these delegated API permissions are commbined, these provide the effective authentication scope for the OneDrive Client for Linux to access your data. The effective 'default' permissions will be:

API / Permissions name	Type	Description	Admin consent required
Files.ReadWrite	Delegated	Have full access to user files	No
Files.ReadWrite.All	Delegated	Have full access to all files user can access	No
Sites.ReadWrite.All	Delegated	Have full access to all items in all site collections	No
offline_access	Delegated	Maintain access to data you have given it access to	No

These 'default' permissions will allow the OneDrive Client for Linux to read, write and delete data associated with your OneDrive Account.

Configuring read-only access to your OneDrive data

In some situations, it may be desirable to configure the OneDrive Client for Linux totally in read-only operation.

To change the application to 'read-only' access, add the following to your configuration file:

read_only_auth_scope = "true"

This will change the user authentication scope requect to use read-only access. When using read-only authentication scopes, the uploading of any data or local change to OneDrive will fail.

Note: When changing this value, you must re-authenticate the client using the --reauth option to utilise the change in authentication scopes.

Important: You also will need to remove your existing application access consent otherwise old authentication consent will still be used and you will still be able to upload changes to OneDrive.

Reviewing your existing application access consent

To review your existing application access consent, you need to access the following URL: https://account.live.com/consent/Manage

From here, you are able to review what applications have been given what access to your data, and remove application access as required.