18.104.22.168. Push Token¶
The token type push sends a cryptographic challenge via the Google Firebase service to the smartphone of the user. This push notification is displayed on the smartphone of the user with a text that tells the user that he or somebody else requests to login to a service. The user can simply accept this request. The smartphone sends a cryptographically signed response to the privacyIDEA server and the login request gets marked as confirmed in the privacyIDEA server. The application checks for this mark and logs the user in automatically. For an example of how the components in a typical deployment of push tokens interact reference the following diagram.
To allow privacyIDEA to send push notifications, a Firebase service needs to be configured. To do so see Firebase Provider.
The PUSH token implements the outofband mode.
The minimum necessary configuration is an
If you want to use push tokens with legacy applications that are not yet set up to be compatible with out-of-band
tokens, you can set the
authentication policy push_wait. Please note, that setting this policy can
interfere with other tokentypes and will impact performance, as detailed in the documentation for
The enrollment of the push token happens in two steps.
22.214.171.124.2.1. Step 1¶
The user scans a QR code. This QR code contains the basic information for the push token and a enrollment URL, to which the smartphone should respond in the enrollment process.
The smartphone stores this data and creates a new key pair.
126.96.36.199.2.2. Step 2¶
The smartphone sends its Firebase ID, the public key of the keypair, the serial number and an enrollment credential back to the enrollment URL of the privacyIDEA server.
The server responds with it’s public key for this token.
188.8.131.52.3.1. Triggering the challenge¶
The authentication request is triggered by an application
just the same like for any
challenge response tokens either with the PIN to the
/validate/check or via the endpoint
privacyIDEA sends a cryptographic challenge with a signature to the Firebase service. The firebase service sends the notification to the smartphone, which can verify the signature using the public key from enrollment step 2.
184.108.40.206.3.2. Accepting login¶
The user can now accept the login by tapping on the push notification. The smartphone sends the signed challenge back to the authentication URL of the privacyIDEA server. The privacyIDEA server verifies the response and marks this authentication request as successfully answered.
In some cases the push notification does not reach the smartphone. Since version 3.4 the smartphone can also poll for active challenges.
220.127.116.11.3.3. Login to application¶
The application can check with the orignial transaction ID with the privacyIDEA server, if the challenge has been successfully answered and automatically login the user.
18.104.22.168.4. More information¶
For a more detailed insight see the code documentation for the Push Token.
Information on the polling mechanism can be found in the corresponding wiki page.
For recent information and a setup guide, visit the community blog