7

With iOS, certificates are installed as part of profiles. Deleting a certificate means removing the profile.

When an iPhone with profiles is backed up, and then the backup is restored to a new device, the profiles are no longer visible under Settings > General > Profiles. So, they can't be deleted via the usual way.

The certificates however get restored to the device. One can see them e.g. under Settings > General > About > Certificate Trust Settings.

Hence my question: How can these certificates be deleted from the device?

  • Idea: maybe it's possible to create a new profile overwriting the previous one, then delete that and see if the certificate disappears with it. Maybe it's the payloadIdentifier as noted here developer.apple.com/business/documentation/… – Jonny Apr 16 at 13:31
11

I found a certificate in my iOS device's Certificate Trust Settings. And it was not be found in Profiles. Finally I remove it by add the cert file again, and then I can found and remove it in Profiles.

At first, I can't found the cert file, because this CA was installed years ago. So I did these things:

  1. Backup iPhone to Mac, View backup file by some software (I used iMazing)
  2. Find TrustStore.sqlite3 in Backup/KeychainDomain/ and export it to HOME DIR.
  3. Use this project https://github.com/ADVTOOLS/ADVTrustStore to export certfile

    ./iosCertTrustManager.py -t ~/TrustStore.sqlite3 -e ~/foo.crt
    
  4. Airdrop or Email this crt file to iOS device, and install it.

  5. Find it in Settings > General > Profiles and Remove it.

  6. It disappear in "Certificate Trust Settings"

Done.

  • Great! I used iPhone Backup Explorer for extracting the TrustStore.sqlite3 from an old backup - the free version was enough for extracting this single file (see: iphonebackupextractor.com/guides/itunes-backup-recovery/…). Then was able to remove the Onavo certificate entry using the suggested steps above. – emem Sep 30 at 14:21

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