Unable to fetch original tag data using fetch_reports

[gokhanozturk]

Previously, I was able to fetch original tag data using fetch_reports after loading the private key extracted via the Genom code. However, it now returns only empty data. Am I missing something or doing something wrong?

python3 fetch_reports.py <redacted_private_key>
Logged in as: <redacted_email> (<account_name>)
{KeyPair(name="None", public_key="<redacted_public_key>", type=KeyType.UNKNOWN): KeyPair(name="None", public_key="<redacted_public_key>", type=KeyType.UNKNOWN)}
INFO:findmy.reports.anisette:Fetching anisette data from http://localhost:6969
defaultdict(<class 'list'>, {})

[malmeloo]

Could you try #144 to see if it fixes the issue?

[malmeloo]

Also, what do you mean with "Genom code" exactly? If you are using an original airtag you should not be using that script, but the real_airtag.py script instead.

[gokhanozturk]

Thanks for the explanation. I'll try your suggested method and see how it goes.

[gokhanozturk]

You're right — by "Genom code" I meant the AES key extracted from the macOS keychain.

As you suggested, I tried using the .plist file with real_airtag.py, but it gives an error saying that the privateKey is missing inside the .plist.

To troubleshoot, I also downgraded the findmy library to an earlier version and successfully sent a request, but the response still returns empty data every time.

[malmeloo]

Okay, well that key should have never even worked with the fetch_reports.py script in the first place. That one is only for tags that never rotate their keys, which official and third-party airtags do. So unless the key you found is one of the airtag's rotating keys, I'm not sure why it worked for you before.

Which version is giving you the privateKey error? Can you try the real_airtag.py script with both the one in that PR and v0.7.6 (from releases/pypi, so not the latest version)?

[gokhanozturk]

I tested this using the latest version, and here’s what I got:

Traceback (most recent call last):
  File "/path/to/real_airtag.py", line 52, in <module>
    sys.exit(main(sys.argv[1]))
  File "/path/to/real_airtag.py", line 25, in main
    airtag = FindMyAccessory.from_plist(f)
  File ".../site-packages/findmy/accessory.py", line 216, in from_plist
    master_key = device_data["privateKey"]["key"]["data"][-28:]
TypeError: '_io.BufferedReader' object is not subscriptable

I bypassed this by modifying the file reading method slightly. That worked, but then I ran into some minor issues in _login.py, which I also patched manually. After that, I was able to send the request successfully — but the response is always empty.

I also tested with version v0.7.6 (from PyPI), and the result was the same: no data returned.

As for extracting the .plist, I tried two different methods:

The standard one.

A custom method I found through my own research.

Unfortunately, neither approach gave any usable result — the .plist still lacks the privateKey, and all requests return empty data.

[malmeloo]

Thanks for the info, I just fixed that error in #146. Can you share what issues you were facing with the _login.py module? I can include those fixes in the PR.

Most issues with official airtags are most likely related to #90. TL;DR: airtags rotate their keys every x minutes, but sometimes it latches onto a key for longer than those x minutes (e.g. when it is powered off, clock desync, or other issues). The library expects the rollover to happen "perfectly" every x minutes, so after a while these two are out of sync and locations can no longer be fetched.

A quick fix is to re-pair your airtag with your iphone/ipad. That should reset the key syncing. The long fix is to wait for me until I've implemented a proper solution :-)

Edit: also, did you check that the plist itself is missing the privateKey? That error you posted is simply caused by the file reading logic being wrong, not that the key itself is missing.