mirror of https://github.com/logos-co/staking.git
100 lines
4.0 KiB
Ruby
100 lines
4.0 KiB
Ruby
using ERC20A as staked;
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using StakeManager as stakeManager;
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methods {
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function ERC20A.balanceOf(address) external returns (uint256) envfree;
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function ERC20A.allowance(address, address) external returns(uint256) envfree;
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function ERC20A.totalSupply() external returns(uint256) envfree;
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function StakeManager.accounts(address) external returns(address, uint256, uint256, uint256, uint256, uint256, uint256) envfree;
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function _.migrateFrom(address, bool, StakeManager.Account) external => DISPATCHER(true);
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function _.increaseTotalMP(uint256) external => DISPATCHER(true);
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function _.owner() external => DISPATCHER(true);
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function Math.mulDiv(uint256 a, uint256 b, uint256 c) internal returns uint256 => mulDivSummary(a,b,c);
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}
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function mulDivSummary(uint256 a, uint256 b, uint256 c) returns uint256 {
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require c != 0;
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return require_uint256(a*b/c);
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}
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function getAccountBalance(address addr) returns uint256 {
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uint256 balance;
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_, balance, _, _, _, _, _ = stakeManager.accounts(addr);
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return balance;
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}
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definition isMigrationFunction(method f) returns bool = (
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f.selector == sig:stakeManager.migrationInitialize(uint256,uint256,uint256,uint256).selector ||
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f.selector == sig:stakeManager.migrateFrom(address,bool,StakeManager.Account).selector ||
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f.selector == sig:stakeManager.increaseTotalMP(uint256).selector ||
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f.selector == sig:stakeManager.startMigration(address).selector
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);
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// check that the ERC20.balanceOf(vault) is >= to StakeManager.accounts[a].balance
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invariant accountBalanceVsERC20Balance()
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staked.balanceOf(currentContract) >= getAccountBalance(currentContract)
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filtered {
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m -> m.selector != sig:leave().selector && !isMigrationFunction(m)
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}
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{ preserved with (env e) {
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// the sender can't be the vault otherwise it can transfer tokens
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require e.msg.sender != currentContract;
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// nobody has allowance to spend the tokens of the vault
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require staked.allowance(currentContract, e.msg.sender) == 0;
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// if it's a generic transfer to the vault, it can't overflow
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require staked.balanceOf(currentContract) + staked.balanceOf(e.msg.sender) <= to_mathint(staked.totalSupply());
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// if it's a transfer from the StakeManager to the vault as reward address, it can't overflow
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require staked.balanceOf(currentContract) + staked.balanceOf(stakeManager) <= to_mathint(staked.totalSupply());
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}
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// the next blocked is run instead of the general one if the current function is staked.transferFrom.
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// if it's a transferFrom, we don't have the from in the first preserved block to check for an overflow
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preserved staked.transferFrom(address from, address to, uint256 amount) with (env e) {
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// if the msg.sender is the vault than it would be able to move tokens.
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// it would be possible only if the Vault contract called the ERC20.transferFrom.
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require e.msg.sender != currentContract;
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// no one has allowance to move tokens owned by the vault
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require staked.allowance(currentContract, e.msg.sender) == 0;
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require staked.balanceOf(from) + staked.balanceOf(to) <= to_mathint(staked.totalSupply());
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}
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preserved stake(uint256 amount, uint256 duration) with (env e) {
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require e.msg.sender != currentContract;
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require staked.balanceOf(currentContract) + staked.balanceOf(e.msg.sender) + staked.balanceOf(stakeManager) <= to_mathint(staked.totalSupply());
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}
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}
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/* assume that migration is zero, causing to ignore cases where it is not zero */
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function simplification() {
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require stakeManager.migration == 0;
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}
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rule reachability(method f) filtered { f -> !isMigrationFunction(f) }
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{
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calldataarg args;
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env e;
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f(e,args);
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satisfy true;
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}
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/*
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The rule below is commented out as it's merely used to easily have the
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prover find all functions that change balances.
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rule whoChangeERC20Balance(method f)
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{
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simplification();
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address user;
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uint256 before = staked.balanceOf(user);
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calldataarg args;
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env e;
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f(e,args);
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assert before == staked.balanceOf(user);
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}
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*/
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