Implement access control for AccountStore members

parachain/pallets/omni-account/src/lib.rs

@@ -30,13 +30,13 @@ pub use pallet::*;
 use frame_support::pallet_prelude::*;
 use frame_support::{
 	dispatch::{GetDispatchInfo, PostDispatchInfo},
-	traits::{IsSubType, UnfilteredDispatchable},
+	traits::{InstanceFilter, IsSubType, UnfilteredDispatchable},
 };
 use frame_system::pallet_prelude::*;
 use sp_core::H256;
 use sp_runtime::traits::Dispatchable;
 use sp_std::boxed::Box;
-use sp_std::vec::Vec;
+use sp_std::{vec, vec::Vec};
 
 pub type MemberCount = u32;
 
@@ -68,7 +68,6 @@ pub mod pallet {
 
 	#[pallet::pallet]
 	#[pallet::storage_version(STORAGE_VERSION)]
-	#[pallet::without_storage_info]
 	pub struct Pallet<T>(_);
 
 	#[pallet::config]
@@ -106,6 +105,36 @@ pub mod pallet {
 
 		/// Convert an `Identity` to OmniAccount type
 		type OmniAccountConverter: OmniAccountConverter<OmniAccount = Self::AccountId>;
+
+		/// The permissions that a member account can have
+		/// The instance filter determines whether a given call may can be dispatched under this type.
+		///
+		/// IMPORTANT: `Default` must be provided and MUST BE the the *most permissive* value.
+		type Permission: Parameter
+			+ Member
+			+ Ord
+			+ PartialOrd
+			+ Default
+			+ InstanceFilter<<Self as Config>::RuntimeCall>
+			+ MaxEncodedLen;
+
+		/// The maximum number of permissions that a member account can have
+		#[pallet::constant]
+		type MaxPermissions: Get<u32>;
+	}
+
+	#[pallet::hooks]
+	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {
+		fn integrity_test() {
+			assert!(
+				<T as Config>::MaxAccountStoreLength::get() > 0,
+				"MaxAccountStoreLength must be greater than 0"
+			);
+			assert!(
+				<T as Config>::MaxPermissions::get() > 0,
+				"MaxPermissions must be greater than 0"
+			);
+		}
 	}
 
 	pub type MemberAccounts<T> = BoundedVec<MemberAccount, <T as Config>::MaxAccountStoreLength>;
@@ -115,6 +144,7 @@ pub mod pallet {
 
 	/// A map between OmniAccount and its MemberAccounts (a bounded vector of MemberAccount)
 	#[pallet::storage]
+	#[pallet::unbounded]
 	#[pallet::getter(fn account_store)]
 	pub type AccountStore<T: Config> =
 		StorageMap<Hasher = Blake2_128Concat, Key = T::AccountId, Value = MemberAccounts<T>>;
@@ -124,6 +154,21 @@ pub mod pallet {
 	pub type MemberAccountHash<T: Config> =
 		StorageMap<Hasher = Blake2_128Concat, Key = H256, Value = T::AccountId>;
 
+	#[pallet::type_value]
+	pub fn DefaultPermissions<T: Config>() -> BoundedVec<T::Permission, T::MaxPermissions> {
+		BoundedVec::try_from(vec![T::Permission::default()]).expect("default permission")
+	}
+
+	/// A map between hash of MemberAccount and its permissions
+	#[pallet::storage]
+	pub type MemberAccountPermissions<T: Config> = StorageMap<
+		Hasher = Blake2_128Concat,
+		Key = H256,
+		Value = BoundedVec<T::Permission, T::MaxPermissions>,
+		QueryKind = ValueQuery,
+		OnEmpty = DefaultPermissions<T>,
+	>;
+
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
@@ -153,6 +198,8 @@ pub mod pallet {
 		IntentRequested { who: T::AccountId, intent: Intent },
 		/// Intent is executed
 		IntentExecuted { who: T::AccountId, intent: Intent, result: IntentExecutionResult },
+		/// Member permission set
+		AccountPermissionsSet { who: T::AccountId, member_account_hash: H256 },
 		/// An auth token is requested
 		AuthTokenRequested { who: T::AccountId, expires_at: BlockNumberFor<T> },
 	}
@@ -165,6 +212,8 @@ pub mod pallet {
 		InvalidAccount,
 		UnknownAccountStore,
 		EmptyAccount,
+		NoPermission,
+		PermissionsLenLimitReached,
 	}
 
 	#[pallet::call]
@@ -181,6 +230,7 @@ pub mod pallet {
 			let _ = T::TEECallOrigin::ensure_origin(origin)?;
 			let omni_account = MemberAccountHash::<T>::get(member_account_hash)
 				.ok_or(Error::<T>::AccountNotFound)?;
+			Self::ensure_permission(call.as_ref(), member_account_hash)?;
 			let result = call.dispatch(RawOrigin::OmniAccount(omni_account.clone()).into());
 			system::Pallet::<T>::inc_account_nonce(&omni_account);
 			Self::deposit_event(Event::DispatchedAsOmniAccount {
@@ -204,6 +254,7 @@ pub mod pallet {
 			let _ = T::TEECallOrigin::ensure_origin(origin)?;
 			let omni_account = MemberAccountHash::<T>::get(member_account_hash)
 				.ok_or(Error::<T>::AccountNotFound)?;
+			Self::ensure_permission(call.as_ref(), member_account_hash)?;
 			let result: Result<
 				PostDispatchInfo,
 				sp_runtime::DispatchErrorWithPostInfo<PostDispatchInfo>,
@@ -233,7 +284,8 @@ pub mod pallet {
 		#[pallet::weight((195_000_000, DispatchClass::Normal))]
 		pub fn add_account(
 			origin: OriginFor<T>,
-			member_account: MemberAccount, // account to be added
+			member_account: MemberAccount,           // account to be added
+			permissions: Option<Vec<T::Permission>>, // permissions for the account
 		) -> DispatchResult {
 			// mutation of AccountStore requires `OmniAccountOrigin`, same as "remove" and "publicize"
 			let who = T::OmniAccountOrigin::ensure_origin(origin)?;
@@ -249,8 +301,16 @@ pub mod pallet {
 			member_accounts
 				.try_push(member_account)
 				.map_err(|_| Error::<T>::AccountStoreLenLimitReached)?;
+			let member_permissions: BoundedVec<T::Permission, T::MaxPermissions> = permissions
+				.map_or_else(
+					|| vec![T::Permission::default()],
+					|p| if p.is_empty() { vec![T::Permission::default()] } else { p },
+				)
+				.try_into()
+				.map_err(|_| Error::<T>::PermissionsLenLimitReached)?;
 
 			MemberAccountHash::<T>::insert(hash, who.clone());
+			MemberAccountPermissions::<T>::insert(hash, member_permissions);
 			AccountStore::<T>::insert(who.clone(), member_accounts.clone());
 
 			Self::deposit_event(Event::AccountAdded {
@@ -277,6 +337,7 @@ pub mod pallet {
 			member_accounts.retain(|member| {
 				if member_account_hashes.contains(&member.hash()) {
 					MemberAccountHash::<T>::remove(member.hash());
+					MemberAccountPermissions::<T>::remove(member.hash());
 					false
 				} else {
 					true
@@ -352,8 +413,13 @@ pub mod pallet {
 					.try_push(member_account.clone())
 					.map_err(|_| Error::<T>::AccountStoreLenLimitReached)?;
 			}
+			let mut permissions = BoundedVec::<T::Permission, T::MaxPermissions>::new();
+			permissions
+				.try_push(T::Permission::default())
+				.map_err(|_| Error::<T>::PermissionsLenLimitReached)?;
 
 			MemberAccountHash::<T>::insert(member_account.hash(), who_account.clone());
+			MemberAccountPermissions::<T>::insert(member_account.hash(), permissions);
 			AccountStore::<T>::insert(who_account.clone(), member_accounts.clone());
 			Self::deposit_event(Event::AccountStoreUpdated {
 				who: who_account,
@@ -378,6 +444,21 @@ pub mod pallet {
 
 		#[pallet::call_index(9)]
 		#[pallet::weight((195_000_000, DispatchClass::Normal))]
+		pub fn set_permissions(
+			origin: OriginFor<T>,
+			member_account_hash: H256,
+			permissions: Vec<T::Permission>,
+		) -> DispatchResult {
+			let who = T::OmniAccountOrigin::ensure_origin(origin)?;
+			let member_permissions: BoundedVec<T::Permission, T::MaxPermissions> =
+				{ permissions.try_into().map_err(|_| Error::<T>::PermissionsLenLimitReached)? };
+			MemberAccountPermissions::<T>::insert(member_account_hash, member_permissions);
+			Self::deposit_event(Event::AccountPermissionsSet { who, member_account_hash });
+			Ok(())
+		}
+
+		#[pallet::call_index(10)]
+		#[pallet::weight((195_000_000, DispatchClass::Normal))]
 		pub fn auth_token_requested(
 			origin: OriginFor<T>,
 			who: T::AccountId,
@@ -412,8 +493,13 @@ pub mod pallet {
 			member_accounts
 				.try_push(identity.into())
 				.map_err(|_| Error::<T>::AccountStoreLenLimitReached)?;
+			let mut permissions = BoundedVec::<T::Permission, T::MaxPermissions>::new();
+			permissions
+				.try_push(T::Permission::default())
+				.map_err(|_| Error::<T>::PermissionsLenLimitReached)?;
 
 			MemberAccountHash::<T>::insert(hash, omni_account.clone());
+			MemberAccountPermissions::<T>::insert(hash, permissions);
 			AccountStore::<T>::insert(omni_account.clone(), member_accounts.clone());
 
 			Self::deposit_event(Event::AccountStoreCreated { who: omni_account.clone() });
@@ -424,6 +510,55 @@ pub mod pallet {
 
 			Ok(member_accounts)
 		}
+
+		fn ensure_permission(
+			call: &<T as Config>::RuntimeCall,
+			member_account_hash: H256,
+		) -> Result<(), Error<T>> {
+			let member_permissions = MemberAccountPermissions::<T>::get(member_account_hash);
+
+			ensure!(
+				member_permissions.iter().any(|permission| permission.filter(call)),
+				Error::<T>::NoPermission
+			);
+
+			match call.is_sub_type() {
+				Some(Call::add_account { permissions: ref new_account_permissions, .. }) => {
+					// If member has default permission, they can add accounts with any permission
+					if member_permissions.contains(&T::Permission::default()) {
+						return Ok(());
+					}
+					match new_account_permissions {
+						Some(new_permissions) => {
+							// an account can only add another account with the same or less permissions
+							if new_permissions.is_empty()
+								|| !new_permissions.iter().all(|p| member_permissions.contains(p))
+							{
+								return Err(Error::<T>::NoPermission);
+							}
+						},
+						None => {
+							// None is equivalent to default permission. It should not be allowed
+							// if the member_permissions have no default permission
+							return Err(Error::<T>::NoPermission);
+						},
+					}
+				},
+				Some(Call::set_permissions { permissions: ref new_permissions, .. }) => {
+					// If member has default permission, they can set permissions to any value
+					if member_permissions.contains(&T::Permission::default()) {
+						return Ok(());
+					}
+					// an account can only set permissions to the same or less permissions
+					if !new_permissions.iter().all(|p| member_permissions.contains(p)) {
+						return Err(Error::<T>::NoPermission);
+					}
+				},
+				_ => return Ok(()),
+			}
+
+			Ok(())
+		}
 	}
 }
 

parachain/pallets/omni-account/src/mock.rs

@@ -14,17 +14,18 @@
 // You should have received a copy of the GNU General Public License
 // along with Litentry.  If not, see <https://www.gnu.org/licenses/>.
 
-use crate::{self as pallet_omni_account, Encode, EnsureOmniAccount};
+use crate::{self as pallet_omni_account, Decode, Encode, EnsureOmniAccount, MaxEncodedLen};
 use core_primitives::{DefaultOmniAccountConverter, Identity, MemberAccount};
 use frame_support::{
 	assert_ok, derive_impl,
 	pallet_prelude::EnsureOrigin,
 	parameter_types,
-	traits::{ConstU32, ConstU64},
+	traits::{ConstU32, ConstU64, InstanceFilter},
 };
 use frame_system::EnsureRoot;
 pub use pallet_teebag::test_util::get_signer;
 use pallet_teebag::test_util::{TEST8_CERT, TEST8_SIGNER_PUB, TEST8_TIMESTAMP, URL};
+use sp_core::RuntimeDebug;
 use sp_keyring::AccountKeyring;
 use sp_runtime::{
 	traits::{IdentifyAccount, IdentityLookup, Verify},
@@ -96,6 +97,10 @@ pub fn charlie() -> Accounts {
 	create_accounts(AccountKeyring::Charlie)
 }
 
+pub fn dave() -> Accounts {
+	create_accounts(AccountKeyring::Dave)
+}
+
 pub fn public_member_account(accounts: Accounts) -> MemberAccount {
 	MemberAccount::Public(accounts.identity)
 }
@@ -158,6 +163,90 @@ impl pallet_teebag::Config for Test {
 	type WeightInfo = ();
 }
 
+#[derive(
+	Copy,
+	Clone,
+	PartialEq,
+	Eq,
+	Ord,
+	PartialOrd,
+	Encode,
+	Decode,
+	RuntimeDebug,
+	MaxEncodedLen,
+	scale_info::TypeInfo,
+)]
+pub enum OmniAccountPermission {
+	All,
+	AccountManagement,
+	RequestNativeIntent,
+	RequestEthereumIntent,
+	RequestSolanaIntent,
+}
+
+impl Default for OmniAccountPermission {
+	fn default() -> Self {
+		Self::All
+	}
+}
+
+impl InstanceFilter<RuntimeCall> for OmniAccountPermission {
+	fn filter(&self, call: &RuntimeCall) -> bool {
+		match self {
+			Self::All => true,
+			Self::AccountManagement => {
+				matches!(
+					call,
+					RuntimeCall::OmniAccount(pallet_omni_account::Call::add_account { .. })
+						| RuntimeCall::OmniAccount(
+							pallet_omni_account::Call::remove_accounts { .. }
+						) | RuntimeCall::OmniAccount(
+						pallet_omni_account::Call::publicize_account { .. }
+					) | RuntimeCall::OmniAccount(pallet_omni_account::Call::set_permissions { .. })
+				)
+			},
+			Self::RequestNativeIntent => {
+				if let RuntimeCall::OmniAccount(pallet_omni_account::Call::request_intent {
+					intent,
+				}) = call
+				{
+					matches!(
+						intent,
+						pallet_omni_account::Intent::SystemRemark(_)
+							| pallet_omni_account::Intent::TransferNative(_)
+					)
+				} else {
+					false
+				}
+			},
+			Self::RequestEthereumIntent => {
+				if let RuntimeCall::OmniAccount(pallet_omni_account::Call::request_intent {
+					intent,
+				}) = call
+				{
+					matches!(
+						intent,
+						pallet_omni_account::Intent::TransferEthereum(_)
+							| pallet_omni_account::Intent::CallEthereum(_)
+					)
+				} else {
+					false
+				}
+			},
+			Self::RequestSolanaIntent => {
+				if let RuntimeCall::OmniAccount(pallet_omni_account::Call::request_intent {
+					intent,
+				}) = call
+				{
+					matches!(intent, pallet_omni_account::Intent::TransferSolana(_))
+				} else {
+					false
+				}
+			},
+		}
+	}
+}
+
 impl pallet_omni_account::Config for Test {
 	type RuntimeOrigin = RuntimeOrigin;
 	type RuntimeCall = RuntimeCall;
@@ -166,6 +255,8 @@ impl pallet_omni_account::Config for Test {
 	type MaxAccountStoreLength = ConstU32<3>;
 	type OmniAccountOrigin = EnsureOmniAccount<Self::AccountId>;
 	type OmniAccountConverter = DefaultOmniAccountConverter;
+	type MaxPermissions = ConstU32<4>;
+	type Permission = OmniAccountPermission;
 }
 
 pub fn get_tee_signer() -> SystemAccountId {