Anyone attempting to perform any query on an idOS node must authenticate with a wallet signature. In order to prevent replay attacks, the message to be signed must include an incrementing nonce.
All queries must include a wallet signature, which establishes that the caller controls that wallet. The address recovered from that signature can be injected into SQL queries. This is one of the ways in which authorization works in idOS nodes.
Node operators can create, update, delete and read any record.
Humans can create any record associated to themselves; they can update, delete and read any record they own.
A human is said to own a record if they control an associated wallet record. This means node operators must necessarily create the first wallet record associated with a human record. Here's an example of what this means under the hood:
action get_credentials ($type, $issuer) public {
SELECT * FROM credentials
INNER JOIN wallets ON credentials.human_id = wallets.human_id
WHERE wallets.address = @caller
AND credentials.type = $type
AND credentials.issuer = $issuer
}Grantees can read any record they’ve been granted access to. This is configurable on a smart contract that nodes monitor. See on-chain-access-grants.md for more information.