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BluePass

BluePass extracts 2FA tokens from SMS and forwards them via Bluetooth
New in version 0.3.0
- Add a button to send the last code again to the companion app
- Add a test button to allow to trigger sending a code to the companion app
- Fix the format of the summary
Description

BluePass extracts two factor authentication codes (2FA) from SMS and sends them to a paired device via Bluetooth RFCOMM. A Qt based companion app bluepass-server will receive the 2FA codes and provide them via the system clipboard.


Use Case

The company I work for is relying on third party services that require to authenticate using 2FA. The second factor is an SMS to your mobile phone. This app was built for convenience, to avoid having to unlock your phone, find the message and then type the received code on the PC.

It is not about the time saved, it's about getting rid of robot tasks.


Setup

You have to configure parameters to match the sender of the SMS and parse the code from the messages sent to you. Currently, regular expressions are used for this task. However, a very basic setup will be provided below.

Regular expression for sender has to be set to a regular expression that matches all the senders of SMS (as they appear in your chat application). Multiple numbers and names can be provided:

  • To match CompanyA, you might simply putCompanyA into the box

  • To match CompanyA and 12345678, write (CompanyA|12345678)



Regular expression to filter the content has to be set to a regular expression that matches the messages you want to catch. Additionally, it has to define one group to extract the actual code that has to be sent to the PC.

  • To match any number, you can use [^\d]*(\d+).*

  • To match a code only with 6 digits, use: .*(\d{6}).*



... as the process of defining a proper regular expression is not that easy, there is another text box Test message. You can paste here the content of the SMS thatyou want to match and adjust the regular expression until it gets parsed correctly.

The last step of the configuration is to pair with the bluetooth adapter of your PC and configure the adapter to be used.


Operation


  • Whenever your mobile phone receives an SMS (and the settings above are configured), this app will try to match the sender and content. If one of the two doesn't match, the message will not be processed any further.

  • If the 2FA code could be extracted, a foreground service will be started (status bar) and the app tries to connect to the configured Bluetooth adapter and sends the code. It retries for some amount of time and reports the status in the status bar. Note: The notification in the status bar doesn't automatically disappear. However, this doesn't consume any resources and can be removed using the Stop button.

  • If the code is required on the mobile phone, it can be copied using the Copy last button.




Protocol

The communication is based on very simple primitives using an RFCOMM channel. The UUID for the service is e4d56fb3-b86d-4572-9b0d-44d483eb1eee. Extracted codes are sent as text (over a secure Bluetooth connection) terminated with a new line character. Therefore, codes may not contain any new line characters.


Future


  • The protocol will be changed to something more sophisticated and extensible

  • Configuration of the sender should be done through contact providers and not use regular expressions

  • Allow to use this app to share text / files with the PC


Packages

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 0.3.0 (5) suggested Added on 2021-12-02

    This version requires Android 10 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • receive text messages (SMS)
      Allows the app to receive and process SMS messages. This means the app could monitor or delete messages sent to your device without showing them to you.
    • pair with Bluetooth devices
      Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • android.permission.BLUETOOTH_CONNECT
    • android.permission.BLUETOOTH_SCAN
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.

    Download APK 14 MiB PGP Signature | Build Log

  • Version 0.2.1 (4) - Added on 2021-11-02

    This version requires Android 10 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • receive text messages (SMS)
      Allows the app to receive and process SMS messages. This means the app could monitor or delete messages sent to your device without showing them to you.
    • pair with Bluetooth devices
      Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • android.permission.BLUETOOTH_CONNECT
    • android.permission.BLUETOOTH_SCAN
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • access approximate location only in the foreground
      This app can get your approximate location from location services while the app is in use. Location services for your device must be turned on for the app to get location.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.

    Download APK 14 MiB PGP Signature | Build Log