Import passkeys from Bitwarden JSON-export

[borque]

Overview

When exporting Bitwardens database at least the current version 2024.4.3 seems to include passkeys.
Unfortunately when importing such a JSON-export into KeePass 2.7.8 the passkeys are not present afterwards,

Steps to Reproduce

1. Export a Bitwarden-database with passkeys to a JSON file using 2024.4.3
2. Import this database into KeepAss 2.7.8 using the Bitwarden-importer offered when creating a database

Expected Behavior

KeePassXC should also import the passkeys and they should be usable in the newly created KeepAssXC-database.

Actual Behavior

The passkeys are missing or are at least not accessible in KeePassXC after import.

Context

Below is a quote from the JSON file that shows that the passkeys are (or at least seem to be) included.
I have removed (REDACTED) all personal information from it.
As long as the automatic import seems impossible: Which parts do I need to provide when re-creating my passkeys manually in KeepAssXC? Two fields, keyValue and userHandle, contain data looking like cryptographic material.

"login": {
        "fido2Credentials": [
          {
            "credentialId": "***R*E*D*A*C*T*E*D***",
            "keyType": "public-key",
            "keyAlgorithm": "ECDSA",
            "keyCurve": "P-256",
            "keyValue": "***R*E*D*A*C*T*E*D***",
            "rpId": "***R*E*D*A*C*T*E*D***",
            "userHandle": "***R*E*D*A*C*T*E*D***",
            "userName": null,
            "counter": "6",
            "rpName": "***R*E*D*A*C*T*E*D***",
            "userDisplayName": "***R*E*D*A*C*T*E*D***",
            "discoverable": "true",
            "creationDate": "***R*E*D*A*C*T*E*D***"
		  }
		  ]
}

KeePassXC - 2.7.8
Operating System: Windows

[droidmonkey]

great thank you for the snippet, we don't import them because this export of passkeys from Bitwarden is brand new.

To manually import you need to transcribe the following:

My best guess is the following mapping:

credentialId -> KPEX_PASSKEY_CREDENTIAL_ID
rpId -> KPEX_PASSKEY_GENERATED_USER_ID
userHandle -> KPEX_PASSKEY_USER_HANDLE
keyValue -> KPEX_PASSKEY_PRIVATE_KEY_PEM
rpName -> KPEX_PASSKEY_RELYING_PARTY
userName -> KPEX_PASSKEY_USERNAME

Since they are exporting the key type, algorithm, and curve I bet the keyValue is not in PEM format...

[droidmonkey]

Can you create a throw away passkey in Bitwarden on https://webauthn.me and export that with the actual values in tact?

You can make a bunch with different key types as well to help us with the import values.

[varjolintu]

Wait, Bitwarden now exports passkeys in unencrypted form?

[borque]

I will try to generate keys with different algorithms in WebAuthn's debugging mode in a Bitwarden test-account the coming week.

One interesting thing -and the one that keeps me away from publishing results of my current WebAuth-testing with my real Bitwarden-vault- is, that the first 47 characters in the keyValue-field seem to be the same for all passkeys (not only those for WebAuthn) I have generated so far.

All of these passkeys use ECDSA and P-256, so it could just be related to the algorithms used, but I'm not sure.

[hu3rror]

Can you create a throw away passkey in Bitwarden on https://webauthn.me and export that with the actual values in tact?

You can make a bunch with different key types as well to help us with the import values.

The exported results from Bitwarden are as follows:

      "login": {
        "fido2Credentials": [
          {
            "credentialId": "a2e10494-af23-400c-8146-23234e1830ed",
            "keyType": "public-key",
            "keyAlgorithm": "ECDSA",
            "keyCurve": "P-256",
            "keyValue": "MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgm5wxMck_Y4iqwK1KxjCjC89uE6ihcxdIoJxWRpr5fQGhRANCAAQxzERjKfkI1v5ME327S1niSKqEKXhx9O-1IJLTmyY7MIX6jfpErxbphBdfZ4T8HH5UyMmwSiaKMWzuEex3FsP_",
            "rpId": "webauthn.me",
            "userHandle": "4CGQVa5pj3VuDgQK2yCjSwoa2VDOC5kfWYsvfgRm1AU",
            "userName": "test",
            "counter": "0",
            "rpName": "Auth0 WebAuthn Playground",
            "userDisplayName": "test",
            "discoverable": "false",
            "creationDate": "2024-05-26T05:59:13.483Z"
          }
        ],
        "uris": [
          {
            "match": null,
            "uri": "https://webauthn.me/"
          }
        ],
        "username": null,
        "password": null,
        "totp": null
      },

I also added the passkey using the same username 'test' in KeepassXC, and here are the results:

• KPEX_PASSKEY_CREDENTIAL_ID: g5IQ80lBIUo1FJNYwwh28US6o0576X_Fg1qQfR4AJGE
• KPEX_PASSKEY_PRIVATE_KEY_PEM:

-----BEGIN PRIVATE KEY-----
MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg1wOBQ37VMFek9Ol9
vNgxxVkGa/+rwrm0kK8FS56OFsShRANCAARczvnTsLOLQDtka0+HkrG/PG/5f4eB
s8l95Jxc5ffzBy4PY01bxqpQhq5Yiur3JaE95WIdXj6MrUhIwCDlRDen
-----END PRIVATE KEY-----

• KPEX_PASSKEY_RELYING_PARTY: webauthn.me
• KPEX_PASSKEY_USERNAME: test
• KPEX_PASSKEY_USER_HANDLE: FTEQqZV77CcL9L_9LDtbHByB0tT8wXDSdklCA6_0b6E

As you can see, the format is consistent, with the exception of the credentialId and KPEX_PASSKEY_CREDENTIAL_ID. The Bitwarder is in UUID format, while 's KPEX_PASSKEY_CREDENTIAL_ID appears to be an encrypted value hashed?

[varjolintu]

@hu3rror Credential ID is usually generated when a passkey is registered. According to this line, they might be using GUID for it by default:
https://github.com/bitwarden/clients/blob/89d7e96b25594e51a7e8db6b227f06aeab79c543/libs/common/src/platform/services/fido2/fido2-client.service.spec.ts#L334
https://github.com/bitwarden/clients/blob/89d7e96b25594e51a7e8db6b227f06aeab79c543/libs/common/src/platform/services/fido2/guid-utils.ts#L14

The example value a2e10494-af23-400c-8146-23234e1830ed after parsing and base64 encode should be: ouEElK8jQAyBRiMjThgw7Q.

[droidmonkey]

The value are in Base64 encoding

[borque]

Hello!
I have created an additional Bitwarden account for testing purposes. Do you still need new passkey exports, or were you abled to get the necessary information from Bitwardens documentation? And if you need, do you want to see keys generated with different algos, or user names or …?
Or can I as a mere user be of any other help here?

[droidmonkey]

If you can help create keys with different algorithms or curves that would be very helpful

[borque]

I created another passkey on https://webauthn.me/ . Passkey generation with Bitwarden only works with the default settings on the landing page for me. When selecting other combinations in webauthn's debug mode the page reports that no supported algorithms are found. I don't know whether Bitwarden lacks support for other curves etc..
I attach both, the json export and the params webauthn.me reports to have used for passkey generation.
Hope this helps you at least a bit.

passkey_test.json
passkey_test.txt