# ICA host params

Date: 2024/08/29

## Context

The ICA host module is misconfigured on Arabica and Mocha. The param `AllowMessages` is set to the default `[*]` which allows all messages. It should have been set to an explicit allowlist defined in [CIP-14](https://github.com/celestiaorg/CIPs/blob/main/cips/cip-14.md).

See [https://github.com/celestiaorg/celestia-app/issues/3824](https://github.com/celestiaorg/celestia-app/issues/3824).

## Resolution strategies

### [short term]: Block validity rule that rejects ICA transactions with a message that contains a non-allowlisted message. [#3836](https://github.com/celestiaorg/celestia-app/issues/3836)

Note: Implement a block validity rule in prepare/process proposal that rejects blocks with ICA messages not on a hard-coded whitelist (ignore the param value). Release this in a minor release (v2.4.x) as a soft fork.

Put it on Arabica for a day, Mocha for a day, Mainnet.

### [short term]: Governance proposal [#3827](https://github.com/celestiaorg/celestia-app/issues/3827)

Pro: One consistent solution for all networks.

Con: There will be a short time period where mainnet has the wildcard which poses a risk if an attacker can use a message via ICA that wasn't intended to be used (i.e. PayForBlob)

Gov proposals take 1 week on Arabica, 1 day on Mocha, 1 week on Mainnet.

### [long term] Make param unmodifiable by governance and hard-code allowlist. Put it on Arabica, Mocha, then Mainnet. [#3837](https://github.com/celestiaorg/celestia-app/issues/3837)

Make the param non-governance modifiable and hard-code it to the allowlist.

Con: this has to wait for celestia-app v3.x.x

## FAQ

### What messages should be on the whitelist?

/ibc.applications.transfer.v1.MsgTransfer
/cosmos.bank.v1beta1.MsgSend
/cosmos.staking.v1beta1.MsgDelegate
/cosmos.staking.v1beta1.MsgBeginRedelegate
/cosmos.staking.v1beta1.MsgUndelegate
/cosmos.staking.v1beta1.MsgCancelUnbondingDelegation
/cosmos.distribution.v1beta1.MsgSetWithdrawAddress
/cosmos.distribution.v1beta1.MsgWithdrawDelegatorReward
/cosmos.distribution.v1beta1.MsgFundCommunityPool
/cosmos.gov.v1.MsgVote
/cosmos.feegrant.v1beta1.MsgGrantAllowance
/cosmos.feegrant.v1beta1.MsgRevokeAllowance

### What messages does v2 support that aren't on the whitelist?

See this [comment](https://github.com/celestiaorg/celestia-app/issues/3678\#issuecomment-2315813856) for a list of all message types per app version.

/celestia.blob.v1.MsgPayForBlobs
/celestia.signal.v1.MsgSignalVersion
/celestia.signal.v1.MsgTryUpgrade
/cosmos.authz.v1beta1.MsgExec
/cosmos.authz.v1beta1.MsgGrant
/cosmos.authz.v1beta1.MsgRevoke
/cosmos.bank.v1beta1.MsgMultiSend
/cosmos.crisis.v1beta1.MsgVerifyInvariant
/cosmos.distribution.v1beta1.MsgWithdrawValidatorCommission
/cosmos.evidence.v1beta1.MsgSubmitEvidence
/cosmos.gov.v1.MsgDeposit
/cosmos.gov.v1.MsgExecLegacyContent
/cosmos.gov.v1.MsgSubmitProposal
/cosmos.gov.v1.MsgVoteWeighted
/cosmos.gov.v1beta1.MsgDeposit
/cosmos.gov.v1beta1.MsgSubmitProposal
/cosmos.gov.v1beta1.MsgVote
/cosmos.gov.v1beta1.MsgVoteWeighted
/cosmos.slashing.v1beta1.MsgUnjail
/cosmos.staking.v1beta1.MsgCreateValidator
/cosmos.staking.v1beta1.MsgEditValidator
/cosmos.vesting.v1beta1.MsgCreatePeriodicVestingAccount
/cosmos.vesting.v1beta1.MsgCreatePermanentLockedAccount
/cosmos.vesting.v1beta1.MsgCreateVestingAccount
/ibc.core.channel.v1.MsgAcknowledgement
/ibc.core.channel.v1.MsgChannelCloseConfirm
/ibc.core.channel.v1.MsgChannelCloseInit
/ibc.core.channel.v1.MsgChannelOpenAck
/ibc.core.channel.v1.MsgChannelOpenConfirm
/ibc.core.channel.v1.MsgChannelOpenInit
/ibc.core.channel.v1.MsgChannelOpenTry
/ibc.core.channel.v1.MsgRecvPacket
/ibc.core.channel.v1.MsgTimeout
/ibc.core.channel.v1.MsgTimeoutOnClose
/ibc.core.client.v1.MsgCreateClient
/ibc.core.client.v1.MsgSubmitMisbehaviour
/ibc.core.client.v1.MsgUpdateClient
/ibc.core.client.v1.MsgUpgradeClient
/ibc.core.connection.v1.MsgConnectionOpenAck
/ibc.core.connection.v1.MsgConnectionOpenConfirm
/ibc.core.connection.v1.MsgConnectionOpenInit
/ibc.core.connection.v1.MsgConnectionOpenTry

### What do other chains configure for `AllowMessages`?

#### Cosmos Hub

grpcurl -d '{"subspace": "icahost", "key": "AllowMessages"}' cosmos-grpc.publicnode.com:443 cosmos.params.v1beta1.Query/Params

{
  "param": {
    "subspace": "icahost",
    "key": "AllowMessages",
    "value": "[\"*\"]"
  }
}

#### Stride

grpcurl -d '{"subspace": "icahost", "key": "AllowMessages"}' stride-grpc.publicnode.com:443 cosmos.params.v1beta1.Query/Params

{
  "param": {
    "subspace": "icahost",
    "key": "AllowMessages",
    "value": "[\"/cosmos.bank.v1beta1.MsgSend\",\"/cosmos.bank.v1beta1.MsgMultiSend\",\"/cosmos.staking.v1beta1.MsgDelegate\",\"/cosmos.staking.v1beta1.MsgUndelegate\",\"/cosmos.staking.v1beta1.MsgBeginRedelegate\",\"/cosmos.distribution.v1beta1.MsgWithdrawDelegatorReward\",\"/cosmos.distribution.v1beta1.MsgSetWithdrawAddress\",\"/ibc.applications.transfer.v1.MsgTransfer\",\"/cosmos.gov.v1beta1.MsgVote\",\"/stride.stakeibc.MsgLiquidStake\",\"/stride.stakeibc.MsgRedeemStake\",\"/stride.stakeibc.MsgClaimUndelegatedTokens\"]"
  }
}

#### Osmosis

grpcurl -d '{"subspace": "icahost", "key": "AllowMessages"}' osmosis-grpc.publicnode.com:443 cosmos.params.v1beta1.Query/Params

{
  "param": {
    "subspace": "icahost",
    "key": "AllowMessages",
    "value": "[\"/ibc.applications.transfer.v1.MsgTransfer\",\"/cosmos.bank.v1beta1.MsgSend\",\"/cosmos.staking.v1beta1.MsgDelegate\",\"/cosmos.staking.v1beta1.MsgBeginRedelegate\",\"/cosmos.staking.v1beta1.MsgCreateValidator\",\"/cosmos.staking.v1beta1.MsgEditValidator\",\"/cosmos.staking.v1beta1.MsgUndelegate\",\"/cosmos.distribution.v1beta1.MsgWithdrawDelegatorReward\",\"/cosmos.distribution.v1beta1.MsgSetWithdrawAddress\",\"/cosmos.distribution.v1beta1.MsgWithdrawValidatorCommission\",\"/cosmos.distribution.v1beta1.MsgFundCommunityPool\",\"/cosmos.gov.v1beta1.MsgVote\",\"/osmosis.gamm.v1beta1.MsgJoinPool\",\"/osmosis.gamm.v1beta1.MsgExitPool\",\"/osmosis.gamm.v1beta1.MsgSwapExactAmountIn\",\"/osmosis.gamm.v1beta1.MsgSwapExactAmountOut\",\"/osmosis.gamm.v1beta1.MsgJoinSwapExternAmountIn\",\"/osmosis.gamm.v1beta1.MsgJoinSwapShareAmountOut\",\"/osmosis.gamm.v1beta1.MsgExitSwapExternAmountOut\",\"/osmosis.gamm.v1beta1.MsgExitSwapShareAmountIn\",\"/osmosis.gamm.poolmodels.balancer.v1beta1.MsgCreateBalancerPool\",\"/osmosis.lockup.MsgLockTokens\",\"/osmosis.lockup.MsgBeginUnlocking\",\"/cosmwasm.wasm.v1.MsgExecuteContract\",\"/cosmwasm.wasm.v1.MsgInstantiateContract\",\"/osmosis.superfluid.MsgSuperfluidUndelegateAndUnbondLock\",\"/osmosis.superfluid.MsgLockAndSuperfluidDelegate\",\"/osmosis.superfluid.MsgSuperfluidDelegate\",\"/osmosis.superfluid.MsgSuperfluidUndelegate\",\"/osmosis.superfluid.MsgSuperfluidUnbondLock\",\"/osmosis.superfluid.MsgCreateFullRangePositionAndSuperfluidDelegate\",\"/osmosis.superfluid.MsgUnlockAndMigrateSharesToFullRangeConcentratedPosition\",\"/osmosis.superfluid.MsgAddToConcentratedLiquiditySuperfluidPosition\",\"/osmosis.superfluid.MsgUnbondConvertAndStake\",\"/osmosis.poolmanager.v1beta1.MsgSwapExactAmountIn\",\"/osmosis.poolmanager.v1beta1.MsgSwapExactAmountInResponse\",\"/osmosis.poolmanager.v1beta1.SwapAmountInRoute\",\"/cosmos.authz.v1beta1.MsgGrant\",\"/cosmos.authz.v1beta1.MsgRevoke\"]"
  }
}

#### Neutron

$ grpcurl -d '{"subspace": "icahost", "key": "AllowMessages"}' neutron-grpc.publicnode.com:443 cosmos.params.v1beta1.Query/Params

{
  "param": {
    "subspace": "icahost",
    "key": "AllowMessages",
    "value": "[\"*\"]"
  }
}