Recovering the Coordinator

Different situations require the recovery of the Coordinator. If the Coordinator fails to unseal its state, it will enter recovery mode.

tip

Use distributed Coordinator instances to reduce the occurrence of events that require manual recovery.

You need the corresponding private key to the RecoveryKeys defined in the manifest and the recovery secret returned to you during the initial upload of the manifest.

info

If you don't want or can't recover the old state, you can also dismiss it by uploading a new manifest. The old state will be overwritten on disk, and the /recover endpoint won't be available anymore.

You can upload the recovery secret through the /recover client API endpoint. To do so, you need to:

• Decode the Base64-encoded output returned to you during the initial upload of the manifest
• Decrypt the decoded output with the corresponding RSA private key of the key defined in the manifest
• Get the temporary root certificate (valid only during recovery mode)
• Upload the decrypted key to the /recover endpoint

Assuming you saved the output from the manifest upload step in a file called recovery_data and the recovery private key in a file called private_key.pem, perform recovery like this:

base64 -d recovery_data \
  | openssl pkeyutl -inkey private_key.pem -decrypt \
    -pkeyopt rsa_padding_mode:oaep -pkeyopt rsa_oaep_md:sha256 \
    -out recovery_key_decrypted

You can then upload the extracted secret using the MarbleRun CLI:

marblerun recover recovery_key_decrypted $MARBLERUN

Alternatively, you can use curl:

era -c coordinator-era.json -h $MARBLERUN -output-root marblerun-temp.pem
curl --cacert marblerun-temp.pem --data-binary @recovery_key_decrypted https://$MARBLERUN/recover

On success, the Coordinator applies the sealed state again. If the Coordinator can't restore the state with the uploaded key, an error will be returned in the logs, and the /recover endpoint will stay open for further interaction.

Multi-party recovery

info

This feature is an option with MarbleRun Enterprise.

If you've configured your MarbleRun deployment for multi-party recovery, send each party the corresponding recovery secret. Ask them to perform the steps above. Once all parties have uploaded their secrets, the Coordinator recovers the sealed state and continues its operations.

note

If your MarbleRun deployment uses distributed Coordinator instances, make sure all parties send their secrets to the same Coordinator instance. One way to achieve this is scaling the Coordinator to a single instance:

kubectl scale --replicas=1 -n marblerun deployment/marblerun-coordinator

After recovery, you can scale the Coordinator back to the desired number of instances.

Example

The following gives an example of a multi-party recovery workflow.

Assume the following RecoveryKeys were set in the manifest:

    "RecoveryKeys": {
        "alice": "-----BEGIN PUBLIC KEY-----\nMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAk/6gfFF+cbcTlj8MT+4M\njjpM+suTwNM9gjv47EAAQ==\n-----END PUBLIC KEY-----\n",
        "bob": "-----BEGIN PUBLIC KEY-----\nMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAsnOEAvynVrbgLdp0lwcp\nk2k04+n4op6tp1Yw2OaDbEAAQ==\n-----END PUBLIC KEY-----\n"
    }

1. The Coordinator returned the following RecoverySecrets:

   $ marblerun manifest set manifest.json $MARBLERUN
   ...
   {"RecoverySecrets":{"alice":"EbkX/skIPrJISf8PiXdzRIKnwQyJ+VejtGzHGfES5NIPuCeEFedqgCVDk=","bob":"bvPzio4A4SvzeHajsb+dFDpDarErcU9wMR0V9hyHtG2lC4ZfyrYjDBE7wtis3eOPgDaMG/HCt="}}

2. Alice decrypts and uploads her recovery key using her private key private_key.pem as follows:

   $ marblerun status $MARBLERUN
   1: Coordinator is in recovery mode. Either upload a key to unseal the saved state, or set a new manifest. For more information on how to proceed, consult the documentation.
   $ echo "EbkX/skIPrJISf8PiXdzRIKnwQyJ+VejtGzHGfES5NIPuCeEFedqgCVDk=" > recovery_data
   $ base64 -d recovery_data \
     | openssl pkeyutl -inkey private_key.pem -decrypt \
       -pkeyopt rsa_padding_mode:oaep -pkeyopt rsa_oaep_md:sha256 \
       -out recovery_key_decrypted
   $ marblerun recover recovery_key_decrypted $MARBLERUN
   Successfully verified Coordinator, now uploading key
   Secret was processed successfully. Upload the next secret. Remaining secrets: 1

   The Coordinator log shows the following:

   {"level":"info","ts":1674206799.524596,"caller":"clientapi/clientapi.go:234","msg":"Recover called"}
   {"level":"info","ts":1674206799.524596,"caller":"clientapi/clientapi.go:253","msg":"Recover: recovery incomplete, more keys needed","remaining":1}

3. Bob does the same with his key to complete the recovery procedure:

   $ marblerun status $MARBLERUN
   1: Coordinator is in recovery mode. Either upload a key to unseal the saved state, or set a new manifest. For more information on how to proceed, consult the documentation.
   $ echo "bvPzio4A4SvzeHajsb+dFDpDarErcU9wMR0V9hyHtG2lC4ZfyrYjDBE7wtis3eOPgDaMG/HCt=" > recovery_data
   $ base64 -d recovery_data \
     | openssl pkeyutl -inkey private_key.pem -decrypt \
       -pkeyopt rsa_padding_mode:oaep -pkeyopt rsa_oaep_md:sha256 \
       -out recovery_key_decrypted
   $ marblerun recover recovery_key_decrypted $MARBLERUN
   Successfully verified Coordinator, now uploading key
   Recovery successful.
   $ marblerun status $MARBLERUN
   3: Coordinator is running correctly and ready to accept marbles.

   The Coordinator log shows the following:

   {"level":"info","ts":1674206836.5523517,"caller":"clientapi/clientapi.go:234","msg":"Recover called"}
   {"level":"info","ts":1674206836.5563517,"caller":"core/core.go:261","msg":"generating quote"}
   {"level":"info","ts":1674206836.6043515,"caller":"clientapi/clientapi.go:281","msg":"Recover successful"}