Ethernaut Solutions implemented in Foundry 2024

GM, anon!

"The Ethernaut is a Web3/Solidity based wargame inspired by overthewire.org, played in the Ethereum Virtual Machine. Each level is a smart contract that needs to be 'hacked'." - Ethernaut webpage

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

Foundry consists of:

• Forge: Ethereum testing framework (like Truffle, Hardhat and DappTools).
• Cast: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
• Anvil: Local Ethereum node, akin to Ganache, Hardhat Network.
• Chisel: Fast, utilitarian, and verbose solidity REPL.

Documentation

• https://book.getfoundry.sh/
• https://blog.dixitaditya.com/series/ethernaut
• https://twitter.com/tudoratu/status/1744032551520313361
• https://twitter.com/tudoratu/status/1748351567663620512
• Google is your friend

Setup and Installation

1. If you haven't already done so, install Foundry on your machine by running the following commands:

curl -L https://foundry.paradigm.xyz | bash
foundryup

2. Clone the Ethernaut Foundry Solutions Repository (and remember to give it a star on Github 😉).
3. Run forge build to execute the build process.
4. Create a new random key pair and import it into MetaMask.

cast wallet new

5. Ethernaut supports a few testnets, however we recommend solving the challenges on the Sepolia testnet using Alchemy web3 provider.

• https://sepoliafaucet.com/
• https://sepolia-faucet.pk910.de/
• https://www.alchemy.com/

6. Make a copy of .env.example and rename it to .env.
7. Fill in the parameters in your .env file.

Structure

The structure of the repository is as follows:

• Under /src, you'll find contracts that implement solutions (attack contracts) for each challenge.
• Under /script, there are scripts responsible for deploying the attack contracts and executing the attack.
• Under /test, you'll find tests that validate the solutions. These tests, similar to scripts, conduct more comprehensive checks.

Level	Script	Test
1. Fallback	✅ 1_Fallback.s.sol	1_Fallback.t.sol
2. Fallout	✅ 2_Fallout.s.sol
3. CoinFlip	✅ 3_CoinFlip.s.sol
4. Telephone	✅ 4_Telephone.s.sol	4_Telephone.t.sol
5. Token	✅ 5_Coin.s.sol
6. Delegation	✅ 6_Delegation.s.sol	6_Delegation.t.sol
7. Force	✅ 7_Force.s.sol	7_Force.t.sol
8. Vault	✅ 8_Vault.s.sol	8_Vault.t.sol
9. King	✅ 9_King.s.sol	9_King.t.sol
10. Reentrancy	✅ 10_Reentrancy.s.sol	10_Reentrancy.t.sol
11. Elevator	✅ 11_Elevator.s.sol
12. Privacy	✅ 12_Privacy.s.sol
13. GatekeeperOne	✅ 13_GatekeeperOne.s.sol
14. GatekeeperTwo	✅ 14_GatekeeperTwo.s.sol
15. NaughtCoin	✅ 15_NaughtCoin.s.sol
16. Preservation	✅ 16_Preservation.s.sol
17. Recovery	✅ 17_Recovery.s.sol
18. MagicNum	✅ 18_MagicNum.s.sol
19. AlienCodex	✅ 19_AlienCodex.s.sol
20. Denial	✅ 20_Denial.s.sol
21. Shop	✅ 21_Shop.s.sol
22. Dex	✅ 22_Dex.s.sol
23. DexTwo	✅ 23_DexTwo.s.sol
24. PuzzleWallet	✅ 24_PuzzleWallet.s.sol
25. Motorbike	✅ 25_Motorbike.s.sol
26. DoubleEntryPoint	✅ 26_DoubleEntryPoint.s.sol	26_DoubleEntryPoint.t.sol
27. GoodSamaritan	✅ 27_GoodSamaritan.s.sol
28. GatekeeperThree	✅ 28_GatekeeperThree.s.sol
29. Switch	✅ -

Usage

Build

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Help

$ forge --help
$ anvil --help
$ cast --help