21.1. Authentication System Overview

Şekil 21.1 Anatomy of authentication system

21.1.1. Authentication database

The new authentication system stores authentication configurations in an SQLite database file located, by default, at <profile directory>/qgis-auth.db.

This authentication database can be moved between QGIS installations without affecting other current QGIS user preferences, as it is completely separate from normal QGIS settings. A configuration ID (a random 7-character alphanumeric string) is generated when initially storing a configuration to the database. This represents the configuration, thereby allowing the ID to be stored in plain text application components, (such as project, plugin, or settings files) without disclosure of its associated credentials.

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The parent directory of the qgis-auth.db can be set using the following environment variable, QGIS_AUTH_DB_DIR_PATH, or set on the command line during launch with the --authdbdirectory option.

21.1.2. Master password

To store or access sensitive information within the database, a user must define a master password. A new master password is requested and verified when initially storing any encrypted data to the database. When sensitive information is accessed, the user is prompted for the master password. The password is then cached for the remainder of the session (until application is quit), unless the user manually chooses an action to clear its cached value. Some instances of using the authentication system do not require input of the master password, such as when selecting an existing authentication configuration, or applying a configuration to a server configuration (such as when adding a WMS layer).

You can choose to save the password in the Wallet/Keyring of your computer.

Şekil 21.2 Input new master password

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A path to a file containing the master password can be set using the following environment variable, QGIS_AUTH_PASSWORD_FILE.

21.1.2.1. Managing the master password

Once set, the master password can be reset; the current master password will be needed prior to resetting. During this process, there is an option to generate a complete backup of the current database.

Şekil 21.3 Resetting master password

If the user forgets the master password, there is no way to retrieve or override it. There is also no means of retrieving encrypted information without knowing the master password.

If a user inputs their existing password incorrectly three times, the dialog will offer to erase the database.

Şekil 21.4 Password prompt after three invalid attempts

21.1.3. Authentication Configurations

You can manage authentication configurations from Configurations in the Authentication tab of the QGIS Options dialog (Settings ► Options).

Şekil 21.5 Configurations editor

Use the button to add a new configuration, the button to remove configurations, and the button to modify existing ones.

Şekil 21.6 Adding config from within Configuration editor

The same type of operations for authentication configuration management (Add, Edit and Remove) can be done when configuring a given service connection, such as configuring an OWS service connection. For that, there are action buttons within the configuration selector for fully managing configurations found within the authentication database. In this case, there is no need to go to the configurations in Authentication tab of QGIS options unless you need to do more comprehensive configuration management.

Şekil 21.7 WMS connection dialog showing Add, Edit, and Remove authentication configuration buttons

When creating or editing an authentication configuration, the info required is a name, an authentication method and any other info that the authentication method requires (see more about the available authentication types in Authentication Methods).

21.1.4. Authentication Methods

Available authentications are provided by C++ plugins much in the same way data provider plugins are supported by QGIS. The method of authentication that can be selected is relative to the access needed for the resource/provider, e.g. HTTP(S) or database, and whether there is support in both QGIS code and a plugin. As such, some authentication method plugins may not be applicable everywhere an authentication configuration selector is shown. A list of available authentication method plugins and their compatible resource/providers can be accessed going to Settings ► Options and, in the Authentication tab, click the Installed Plugins button.

Şekil 21.8 Available method plugins list

Plugins can be created for new authentication methods that do not require QGIS to be recompiled. Since the support for plugins is currently C++-only, QGIS will need to be restarted for the new dropped-in plugin to become available to the user. Ensure your plugin is compiled against the same target version of QGIS if you intend to add it to an existing target install.

Şekil 21.9 Basic HTTP authentication configs

Şekil 21.10 ESRI Token authentication configs

Şekil 21.11 OAuth2 authentication configs

Şekil 21.12 PKI paths authentication configs

Şekil 21.13 PKI PKCS#12 file paths authentication configs

Şekil 21.14 Stored Identity authentication configs

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The Resource URL is currently an unimplemented feature that will eventually allow a particular configuration to be auto-chosen when connecting to resources at a given URL.

21.1.5. Master Password and Auth Config Utilities

Under the Options menu (Settings ► Options) in the Authentication tab, there are several utility actions to manage the authentication database and configurations:

Şekil 21.15 Utilities menu

• Input master password: opens the master password input dialog, independent of performing any authentication database command

• Clear cached master password: unsets the master password if it has been set

• Reset master password: opens a dialog to change the master password (the current password must be known) and optionally back up the current database

• Clear network authentication access cache: clears the authentication cache of all connections

• Automatically clear network authentication access cache on SSL errors: the connection cache stores all authentication data for connections, also when the connection fails. If you change authentication configurations or certification authorities, you should clear the authentication cache or restart QGIS. When this option is checked, the authentication cache will be automatically cleared every time an SSL error occurs and you choose to abort the connection

• Integrate master password with your Wallet/Keyring: adds the master password to your personal Wallet/Keyring

• Store/update the master password in your Wallet/Keyring: updates the changed master password in your Wallet/Keyring

• Clear the master password from your Wallet/Keyring: deletes the master password from your Wallet/Keyring

• Enable password helper debug log: enables a debug tool that will contain all the log information of the authentication methods

• Clear cached authentication configurations: clears the internal lookup cache for configurations, used to speed up network connections. This does not clear QGIS’s core network access manager’s cache, which requires a relaunch of QGIS.

• Remove all authentication configurations: clears the database of all configuration records, without removing other stored records.

• Erase authentication database: schedules a backup of the current database and complete rebuild of the database table structure. The actions are scheduled for a later time, to ensure that other operations, like project loading, do not interrupt the operation or cause errors due to a temporarily missing database.

  

  Şekil 21.16 DB erase verification menu

21.1.6. Using authentication configurations

Typically, an authentication configuration is selected in a configuration dialog for a network services (such as WMS). However, the selector widget can be embedded anywhere authentication is needed or in non-core functionality, like in third-party PyQGIS or C++ plugins.

When using the selector, No authentication is displayed in the pop-up menu control when nothing is selected, when there are no configurations to choose from, or when a previously assigned configuration can no longer be found in the database. The Type and Id fields are read-only and provide a description of the authentication method and the config’s ID respectively.

Şekil 21.17 Authentication configuration selector with no authentication

Şekil 21.18 Authentication configuration selector with selected config

21.1.7. Python bindings

All classes and public functions have sip bindings, except QgsAuthCrypto, since management of the master password hashing and auth database encryption should be handled by the main app, and not via Python. See Security Considerations concerning Python access.