Onchain permissioning uses smart contracts to store and administer the node, account, and admin whitelists. Using onchain permissioning enables all nodes to read the whitelists from a single source, the blockchain.
The permissioning smart contracts and Permissioning Management Dapp are a separate product to Hyperledger Besu, located in the PegaSysEng/permissioning-smart-contracts repository.
Custom smart contracts and dapps can be implemented to work with onchain permissioning.
The permissioning smart contracts provided in the PegaSysEng/permissioning-smart-contracts repository are:
- Ingress contracts for nodes and accounts - proxy contracts defined in the genesis file to defer the permissioning logic to the Node Rules and Account Rules contracts. The Ingress contracts deploy to static addresses.
- Node Rules - stores the node whitelist and node whitelist operations (for example, add and remove).
- Account Rules - stores the accounts whitelist and account whitelist operations (for example, add and remove).
- Admin - stores the list of admin accounts and admin list operations (for example, add and remove). There is one list of admin accounts for node and accounts.
Permissioning management Dapp
The Permissioning Management Dapp provides view and maintain access to the whitelists.
Before v1.2, the management interface used Truffle, now deprecated. For an improved user experience, use the Dapp.
Permissioning implements three whitelists:
- Accounts, which can submit transactions to the network.
- Nodes, which can participate in the network.
- Admins, which are accounts that can update the accounts and nodes whitelists.
Using account permissioning and privacy
If using account permissioning and privacy, a signing key must be specified using the
--privacy-marker-transaction-signing-key-file] command line option and the signing key
included in the accounts whitelist.
When a node is added to the network, the node connects to the bootnodes until it synchronizes to the chain head, regardless of node permissions. After synchronization, the Account Rules and Node Rules smart contracts apply the permissioning rules.
If a sychronized node loses all peer connections (that is, it has zero peers), it reconnects to the bootnodes to rediscover peers.
All bootnodes must be on the nodes whitelist.