mirror of https://github.com/crytic/slither
Josselin Feist
2 years ago
commit
879157cfc1
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--- |
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name: Test slither-read-storage |
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defaults: |
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run: |
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# To load bashrc |
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shell: bash -ieo pipefail {0} |
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on: |
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pull_request: |
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branches: [master, dev] |
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schedule: |
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# run CI every day even if no PRs/merges occur |
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- cron: '0 12 * * *' |
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jobs: |
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build: |
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name: Test slither-read-storage |
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runs-on: ubuntu-latest |
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steps: |
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- uses: actions/checkout@v2 |
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- name: Setup node |
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uses: actions/setup-node@v2 |
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with: |
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node-version: '14' |
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- name: Install ganache |
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run: npm install --global ganache |
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- name: Set up Python 3.8 |
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uses: actions/setup-python@v2 |
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with: |
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python-version: 3.8 |
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- name: Install python dependencies |
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run: | |
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pip install ".[dev]" |
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pip install web3 |
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solc-select install 0.8.1 |
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solc-select install 0.8.10 |
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solc-select use 0.8.1 |
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- name: Run slither-read-storage |
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run: | |
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pytest tests/test_read_storage.py |
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- name: Run storage layout tests |
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run: | |
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pytest tests/test_storage_layout.py |
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@ -0,0 +1,95 @@ |
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from typing import List |
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from slither.core.cfg.node import Node |
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from slither.core.declarations.solidity_variables import SolidityVariable |
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from slither.slithir.operations import HighLevelCall, LibraryCall |
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from slither.core.declarations import Contract, Function, SolidityVariableComposed |
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from slither.analyses.data_dependency.data_dependency import is_dependent |
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from slither.core.compilation_unit import SlitherCompilationUnit |
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class ArbitrarySendErc20: |
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"""Detects instances where ERC20 can be sent from an arbitrary from address.""" |
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def __init__(self, compilation_unit: SlitherCompilationUnit): |
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self._compilation_unit = compilation_unit |
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self._no_permit_results: List[Node] = [] |
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self._permit_results: List[Node] = [] |
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@property |
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def compilation_unit(self) -> SlitherCompilationUnit: |
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return self._compilation_unit |
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@property |
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def no_permit_results(self) -> List[Node]: |
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return self._no_permit_results |
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@property |
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def permit_results(self) -> List[Node]: |
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return self._permit_results |
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def _detect_arbitrary_from(self, contract: Contract): |
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for f in contract.functions: |
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all_high_level_calls = [ |
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f_called[1].solidity_signature |
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for f_called in f.high_level_calls |
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if isinstance(f_called[1], Function) |
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] |
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all_library_calls = [f_called[1].solidity_signature for f_called in f.library_calls] |
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if ( |
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"transferFrom(address,address,uint256)" in all_high_level_calls |
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or "safeTransferFrom(address,address,address,uint256)" in all_library_calls |
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): |
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if ( |
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"permit(address,address,uint256,uint256,uint8,bytes32,bytes32)" |
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in all_high_level_calls |
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): |
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ArbitrarySendErc20._arbitrary_from(f.nodes, self._permit_results) |
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else: |
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ArbitrarySendErc20._arbitrary_from(f.nodes, self._no_permit_results) |
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@staticmethod |
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def _arbitrary_from(nodes: List[Node], results: List[Node]): |
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"""Finds instances of (safe)transferFrom that do not use msg.sender or address(this) as from parameter.""" |
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for node in nodes: |
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for ir in node.irs: |
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if ( |
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isinstance(ir, HighLevelCall) |
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and isinstance(ir.function, Function) |
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and ir.function.solidity_signature == "transferFrom(address,address,uint256)" |
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and not ( |
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is_dependent( |
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ir.arguments[0], |
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SolidityVariableComposed("msg.sender"), |
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node.function.contract, |
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) |
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or is_dependent( |
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ir.arguments[0], |
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SolidityVariable("this"), |
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node.function.contract, |
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) |
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) |
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): |
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results.append(ir.node) |
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elif ( |
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isinstance(ir, LibraryCall) |
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and ir.function.solidity_signature |
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== "safeTransferFrom(address,address,address,uint256)" |
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and not ( |
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is_dependent( |
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ir.arguments[1], |
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SolidityVariableComposed("msg.sender"), |
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node.function.contract, |
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) |
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or is_dependent( |
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ir.arguments[1], |
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SolidityVariable("this"), |
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node.function.contract, |
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) |
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) |
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): |
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results.append(ir.node) |
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def detect(self): |
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"""Detect transfers that use arbitrary `from` parameter.""" |
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for c in self.compilation_unit.contracts_derived: |
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self._detect_arbitrary_from(c) |
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@ -0,0 +1,45 @@ |
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from typing import List |
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from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification |
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from slither.utils.output import Output |
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from .arbitrary_send_erc20 import ArbitrarySendErc20 |
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class ArbitrarySendErc20NoPermit(AbstractDetector): |
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""" |
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Detect when `msg.sender` is not used as `from` in transferFrom |
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""" |
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ARGUMENT = "arbitrary-send-erc20" |
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HELP = "transferFrom uses arbitrary `from`" |
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IMPACT = DetectorClassification.HIGH |
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CONFIDENCE = DetectorClassification.HIGH |
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WIKI = "https://github.com/trailofbits/slither/wiki/Detector-Documentation#arbitrary-send-erc20" |
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WIKI_TITLE = "Arbitrary `from` in transferFrom" |
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WIKI_DESCRIPTION = "Detect when `msg.sender` is not used as `from` in transferFrom." |
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WIKI_EXPLOIT_SCENARIO = """ |
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```solidity |
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function a(address from, address to, uint256 amount) public { |
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erc20.transferFrom(from, to, am); |
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} |
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``` |
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Alice approves this contract to spend her ERC20 tokens. Bob can call `a` and specify Alice's address as the `from` parameter in `transferFrom`, allowing him to transfer Alice's tokens to himself.""" |
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WIKI_RECOMMENDATION = """ |
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Use `msg.sender` as `from` in transferFrom. |
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""" |
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def _detect(self) -> List[Output]: |
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"""""" |
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results: List[Output] = [] |
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arbitrary_sends = ArbitrarySendErc20(self.compilation_unit) |
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arbitrary_sends.detect() |
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for node in arbitrary_sends.no_permit_results: |
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func = node.function |
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info = [func, " uses arbitrary from in transferFrom: ", node, "\n"] |
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res = self.generate_result(info) |
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results.append(res) |
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return results |
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from typing import List |
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from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification |
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from slither.utils.output import Output |
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from .arbitrary_send_erc20 import ArbitrarySendErc20 |
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class ArbitrarySendErc20Permit(AbstractDetector): |
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""" |
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Detect when `msg.sender` is not used as `from` in transferFrom along with the use of permit. |
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""" |
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ARGUMENT = "arbitrary-send-erc20-permit" |
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HELP = "transferFrom uses arbitrary from with permit" |
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IMPACT = DetectorClassification.HIGH |
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CONFIDENCE = DetectorClassification.MEDIUM |
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WIKI = "https://github.com/trailofbits/slither/wiki/Detector-Documentation#arbitrary-send-erc20-permit" |
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WIKI_TITLE = "Arbitrary `from` in transferFrom used with permit" |
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WIKI_DESCRIPTION = ( |
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"Detect when `msg.sender` is not used as `from` in transferFrom and permit is used." |
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) |
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WIKI_EXPLOIT_SCENARIO = """ |
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```solidity |
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function bad(address from, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s, address to) public { |
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erc20.permit(from, address(this), value, deadline, v, r, s); |
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erc20.transferFrom(from, to, value); |
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} |
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``` |
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If an ERC20 token does not implement permit and has a fallback function e.g. WETH, transferFrom allows an attacker to transfer all tokens approved for this contract.""" |
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WIKI_RECOMMENDATION = """ |
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Ensure that the underlying ERC20 token correctly implements a permit function. |
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""" |
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def _detect(self) -> List[Output]: |
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"""""" |
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results: List[Output] = [] |
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arbitrary_sends = ArbitrarySendErc20(self.compilation_unit) |
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arbitrary_sends.detect() |
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for node in arbitrary_sends.permit_results: |
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func = node.function |
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info = [ |
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func, |
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" uses arbitrary from in transferFrom in combination with permit: ", |
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node, |
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"\n", |
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] |
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res = self.generate_result(info) |
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results.append(res) |
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return results |
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@ -0,0 +1,91 @@ |
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# Slither-read-storage |
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Slither-read-storage is a tool to retrieve the storage slots and values of entire contracts or single variables. |
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## Usage |
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### CLI Interface |
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```shell |
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positional arguments: |
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contract_source (DIR) ADDRESS The deployed contract address if verified on etherscan. Prepend project directory for unverified contracts. |
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optional arguments: |
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--variable-name VARIABLE_NAME The name of the variable whose value will be returned. |
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--rpc-url RPC_URL An endpoint for web3 requests. |
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--key KEY The key/ index whose value will be returned from a mapping or array. |
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--deep-key DEEP_KEY The key/ index whose value will be returned from a deep mapping or multidimensional array. |
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--struct-var STRUCT_VAR The name of the variable whose value will be returned from a struct. |
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--storage-address STORAGE_ADDRESS The address of the storage contract (if a proxy pattern is used). |
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--contract-name CONTRACT_NAME The name of the logic contract. |
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--layout Toggle used to write a JSON file with the entire storage layout. |
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--value Toggle used to include values in output. |
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--max-depth MAX_DEPTH Max depth to search in data structure. |
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``` |
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### Examples |
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Retrieve the storage slots of a local contract: |
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```shell |
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slither-read-storage file.sol 0x8ad599c3a0ff1de082011efddc58f1908eb6e6d8 --layout |
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``` |
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Retrieve the storage slots of a contract verified on an Etherscan-like platform: |
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```shell |
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slither-read-storage 0x8ad599c3a0ff1de082011efddc58f1908eb6e6d8 --layout |
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``` |
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To retrieve the values as well, pass `--value` and `--rpc-url $RPC_URL`: |
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```shell |
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slither-read-storage 0x8ad599c3a0ff1de082011efddc58f1908eb6e6d8 --layout --rpc-url $RPC_URL --value |
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``` |
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To view only the slot of the `slot0` structure variable, pass `--variable-name slot0`: |
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```shell |
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slither-read-storage 0x8ad599c3a0ff1de082011efddc58f1908eb6e6d8 --variable-name slot0 --rpc-url $RPC_URL --value |
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``` |
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To view a member of the `slot0` struct, pass `--struct-var tick` |
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```shell |
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slither-read-storage 0x8ad599c3a0ff1de082011efddc58f1908eb6e6d8 --variable-name slot0 --rpc-url $RPC_URL --value --struct-var tick |
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``` |
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Retrieve the ERC20 balance slot of an account: |
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```shell |
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slither-read-storage 0xa2327a938Febf5FEC13baCFb16Ae10EcBc4cbDCF --variable-name balances --key 0xab5801a7d398351b8be11c439e05c5b3259aec9b |
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``` |
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To retrieve the actual balance, pass `--variable-name balances` and `--key 0xab5801a7d398351b8be11c439e05c5b3259aec9b`. (`balances` is a `mapping(address => uint)`) |
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Since this contract uses the delegatecall-proxy pattern, the proxy address must be passed as the `--storage-address`. Otherwise, it is not required. |
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```shell |
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slither-read-storage 0xa2327a938Febf5FEC13baCFb16Ae10EcBc4cbDCF --variable-name balances --key 0xab5801a7d398351b8be11c439e05c5b3259aec9b --storage-address 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48 --rpc-url $RPC_URL --value |
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``` |
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## Troubleshooting/FAQ |
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- If the storage slots or values of a contract verified Etherscan are wrong, try passing `--contract $CONTRACT_NAME` explicitly. Otherwise, the storage may be retrieved from storage slots based off an unrelated contract (Etherscan includes these). (Also, make sure that the RPC is for the correct network.) |
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- If Etherscan fails to return a source code, try passing `--etherscan-apikey $API_KEY` to avoid hitting a rate-limit. |
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- How do I use this tool on other chains? |
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If an EVM chain has an Etherscan-like platform the crytic-compile supports, this tool supports it by making the following modifications. |
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Take Avalanche, for instance: |
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```shell |
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slither-read-storage avax:0x0000000000000000000000000000000000000000 --layout --value --rpc-url $AVAX_RPC_URL |
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``` |
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## Limitations |
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- Requires source code. |
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- Only works on Solidity contracts. |
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- Cannot find variables with unstructured storage. |
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- Does not support all data types (please open an issue or PR). |
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- Mappings cannot be completely enumerated since all keys used historically are not immediately available. |
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@ -0,0 +1 @@ |
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from .read_storage import SlitherReadStorage |
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""" |
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Tool to read on-chain storage from EVM |
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""" |
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import json |
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import argparse |
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from crytic_compile import cryticparser |
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from slither import Slither |
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from slither.tools.read_storage.read_storage import SlitherReadStorage |
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def parse_args() -> argparse.Namespace: |
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"""Parse the underlying arguments for the program. |
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Returns: |
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The arguments for the program. |
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""" |
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parser = argparse.ArgumentParser( |
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description="Read a variable's value from storage for a deployed contract", |
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usage=( |
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"\nTo retrieve a single variable's value:\n" |
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+ "\tslither-read-storage $TARGET address --variable-name $NAME\n" |
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+ "To retrieve a contract's storage layout:\n" |
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+ "\tslither-read-storage $TARGET address --contract-name $NAME --layout\n" |
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+ "To retrieve a contract's storage layout and values:\n" |
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+ "\tslither-read-storage $TARGET address --contract-name $NAME --layout --values\n" |
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+ "TARGET can be a contract address or project directory" |
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), |
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) |
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parser.add_argument( |
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"contract_source", |
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help="The deployed contract address if verified on etherscan. Prepend project directory for unverified contracts.", |
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nargs="+", |
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) |
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parser.add_argument( |
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"--variable-name", |
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help="The name of the variable whose value will be returned.", |
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default=None, |
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) |
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|
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parser.add_argument("--rpc-url", help="An endpoint for web3 requests.") |
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|
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parser.add_argument( |
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"--key", |
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help="The key/ index whose value will be returned from a mapping or array.", |
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default=None, |
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) |
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|
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parser.add_argument( |
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"--deep-key", |
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help="The key/ index whose value will be returned from a deep mapping or multidimensional array.", |
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default=None, |
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) |
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|
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parser.add_argument( |
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"--struct-var", |
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help="The name of the variable whose value will be returned from a struct.", |
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default=None, |
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) |
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|
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parser.add_argument( |
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"--storage-address", |
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help="The address of the storage contract (if a proxy pattern is used).", |
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default=None, |
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) |
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|
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parser.add_argument( |
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"--contract-name", |
||||||
|
help="The name of the logic contract.", |
||||||
|
default=None, |
||||||
|
) |
||||||
|
|
||||||
|
parser.add_argument( |
||||||
|
"--layout", |
||||||
|
action="store_true", |
||||||
|
help="Toggle used to write a JSON file with the entire storage layout.", |
||||||
|
) |
||||||
|
|
||||||
|
parser.add_argument( |
||||||
|
"--value", |
||||||
|
action="store_true", |
||||||
|
help="Toggle used to include values in output.", |
||||||
|
) |
||||||
|
|
||||||
|
parser.add_argument("--max-depth", help="Max depth to search in data structure.", default=20) |
||||||
|
|
||||||
|
cryticparser.init(parser) |
||||||
|
|
||||||
|
return parser.parse_args() |
||||||
|
|
||||||
|
|
||||||
|
def main() -> None: |
||||||
|
args = parse_args() |
||||||
|
|
||||||
|
if len(args.contract_source) == 2: |
||||||
|
# Source code is file.sol or project directory |
||||||
|
source_code, target = args.contract_source |
||||||
|
slither = Slither(source_code, **vars(args)) |
||||||
|
else: |
||||||
|
# Source code is published and retrieved via etherscan |
||||||
|
target = args.contract_source[0] |
||||||
|
slither = Slither(target, **vars(args)) |
||||||
|
|
||||||
|
if args.contract_name: |
||||||
|
contracts = slither.get_contract_from_name(args.contract_name) |
||||||
|
else: |
||||||
|
contracts = slither.contracts |
||||||
|
|
||||||
|
srs = SlitherReadStorage(contracts, args.max_depth) |
||||||
|
|
||||||
|
if args.rpc_url: |
||||||
|
# Remove target prefix e.g. rinkeby:0x0 -> 0x0. |
||||||
|
address = target[target.find(":") + 1 :] |
||||||
|
# Default to implementation address unless a storage address is given. |
||||||
|
if not args.storage_address: |
||||||
|
args.storage_address = address |
||||||
|
srs.storage_address = args.storage_address |
||||||
|
|
||||||
|
srs.rpc = args.rpc_url |
||||||
|
|
||||||
|
if args.layout: |
||||||
|
srs.get_all_storage_variables() |
||||||
|
srs.get_storage_layout() |
||||||
|
else: |
||||||
|
assert args.variable_name |
||||||
|
# Use a lambda func to only return variables that have same name as target. |
||||||
|
# x is a tuple (`Contract`, `StateVariable`). |
||||||
|
srs.get_all_storage_variables(lambda x: bool(x[1].name == args.variable_name)) |
||||||
|
srs.get_target_variables(**vars(args)) |
||||||
|
|
||||||
|
# To retrieve slot values an rpc url is required. |
||||||
|
if args.value: |
||||||
|
assert args.rpc_url |
||||||
|
srs.get_slot_values() |
||||||
|
|
||||||
|
# Only write file if storage layout is used. |
||||||
|
if len(srs.slot_info) > 1: |
||||||
|
with open("storage_layout.json", "w", encoding="utf-8") as file: |
||||||
|
json.dump(srs.slot_info, file, indent=4) |
||||||
|
|
||||||
|
|
||||||
|
if __name__ == "__main__": |
||||||
|
main() |
||||||
@ -0,0 +1,551 @@ |
|||||||
|
import sys |
||||||
|
import logging |
||||||
|
from math import floor |
||||||
|
|
||||||
|
from typing import Callable, Optional, Tuple, Union, List, Dict |
||||||
|
|
||||||
|
try: |
||||||
|
from typing import TypedDict |
||||||
|
except ImportError: |
||||||
|
# < Python 3.8 |
||||||
|
from typing_extensions import TypedDict |
||||||
|
|
||||||
|
try: |
||||||
|
from web3 import Web3 |
||||||
|
from eth_typing.evm import ChecksumAddress |
||||||
|
from eth_abi import decode_single, encode_abi |
||||||
|
from eth_utils import keccak |
||||||
|
from hexbytes import HexBytes |
||||||
|
from .utils import ( |
||||||
|
is_elementary, |
||||||
|
is_array, |
||||||
|
is_mapping, |
||||||
|
is_struct, |
||||||
|
is_user_defined_type, |
||||||
|
get_offset_value, |
||||||
|
get_storage_data, |
||||||
|
coerce_type, |
||||||
|
) |
||||||
|
except ImportError: |
||||||
|
print("ERROR: in order to use slither-read-storage, you need to install web3") |
||||||
|
print("$ pip3 install web3 --user\n") |
||||||
|
sys.exit(-1) |
||||||
|
|
||||||
|
from slither.core.solidity_types.type import Type |
||||||
|
from slither.core.solidity_types import ArrayType |
||||||
|
from slither.core.declarations import Contract, StructureContract |
||||||
|
from slither.core.variables.state_variable import StateVariable |
||||||
|
from slither.core.variables.structure_variable import StructureVariable |
||||||
|
|
||||||
|
|
||||||
|
logging.basicConfig() |
||||||
|
logger = logging.getLogger("Slither-read-storage") |
||||||
|
logger.setLevel(logging.INFO) |
||||||
|
|
||||||
|
|
||||||
|
class SlotInfo(TypedDict): |
||||||
|
type_string: str |
||||||
|
slot: int |
||||||
|
size: int |
||||||
|
offset: int |
||||||
|
value: Optional[Union[int, bool, str, ChecksumAddress, hex]] |
||||||
|
elems: Optional[TypedDict] # same types as SlotInfo |
||||||
|
|
||||||
|
|
||||||
|
class SlitherReadStorageException(Exception): |
||||||
|
pass |
||||||
|
|
||||||
|
|
||||||
|
# pylint: disable=too-many-instance-attributes |
||||||
|
class SlitherReadStorage: |
||||||
|
def __init__(self, contracts, max_depth): |
||||||
|
self._contracts: List[Contract] = contracts |
||||||
|
self._max_depth: int = max_depth |
||||||
|
self._log: str = "" |
||||||
|
self._slot_info: SlotInfo = {} |
||||||
|
self._target_variables = [] |
||||||
|
self._web3: Optional[Web3] = None |
||||||
|
self._checksum_address: Optional[ChecksumAddress] = None |
||||||
|
self.storage_address: Optional[str] = None |
||||||
|
self.rpc: Optional[str] = None |
||||||
|
|
||||||
|
@property |
||||||
|
def contracts(self) -> List[Contract]: |
||||||
|
return self._contracts |
||||||
|
|
||||||
|
@property |
||||||
|
def max_depth(self) -> int: |
||||||
|
return int(self._max_depth) |
||||||
|
|
||||||
|
@property |
||||||
|
def log(self) -> str: |
||||||
|
return self._log |
||||||
|
|
||||||
|
@log.setter |
||||||
|
def log(self, log) -> str: |
||||||
|
self._log = log |
||||||
|
|
||||||
|
@property |
||||||
|
def web3(self) -> Web3: |
||||||
|
if not self._web3: |
||||||
|
self._web3 = Web3(Web3.HTTPProvider(self.rpc)) |
||||||
|
return self._web3 |
||||||
|
|
||||||
|
@property |
||||||
|
def checksum_address(self) -> ChecksumAddress: |
||||||
|
if not self._checksum_address: |
||||||
|
self._checksum_address = self.web3.toChecksumAddress(self.storage_address) |
||||||
|
return self._checksum_address |
||||||
|
|
||||||
|
@property |
||||||
|
def target_variables(self) -> List[Tuple[Contract, StateVariable]]: |
||||||
|
"""Storage variables (not constant or immutable) and their associated contract.""" |
||||||
|
return self._target_variables |
||||||
|
|
||||||
|
@property |
||||||
|
def slot_info(self) -> SlotInfo: |
||||||
|
"""Contains the location, type, size, offset, and value of contract slots.""" |
||||||
|
return self._slot_info |
||||||
|
|
||||||
|
def get_storage_layout(self) -> None: |
||||||
|
"""Retrieves the storage layout of entire contract.""" |
||||||
|
tmp = {} |
||||||
|
for contract, var in self.target_variables: |
||||||
|
type_ = var.type |
||||||
|
info = self.get_storage_slot(var, contract) |
||||||
|
tmp[var.name] = info |
||||||
|
|
||||||
|
if is_user_defined_type(type_) and is_struct(type_.type): |
||||||
|
tmp[var.name]["elems"] = self._all_struct_slots(var, contract) |
||||||
|
continue |
||||||
|
|
||||||
|
if is_array(type_): |
||||||
|
elems = self._all_array_slots(var, contract, type_, info["slot"]) |
||||||
|
tmp[var.name]["elems"] = elems |
||||||
|
|
||||||
|
self._slot_info = tmp |
||||||
|
|
||||||
|
def get_storage_slot( |
||||||
|
self, |
||||||
|
target_variable: StateVariable, |
||||||
|
contract: Contract, |
||||||
|
**kwargs, |
||||||
|
) -> Union[SlotInfo, None]: |
||||||
|
"""Finds the storage slot of a variable in a given contract. |
||||||
|
Args: |
||||||
|
target_variable (`StateVariable`): The variable to retrieve the slot for. |
||||||
|
contracts (`Contract`): The contract that contains the given state variable. |
||||||
|
**kwargs: |
||||||
|
key (str): Key of a mapping or index position if an array. |
||||||
|
deep_key (str): Key of a mapping embedded within another mapping or secondary index if array. |
||||||
|
struct_var (str): Structure variable name. |
||||||
|
Returns: |
||||||
|
(`SlotInfo`) | None : A dictionary of the slot information. |
||||||
|
""" |
||||||
|
|
||||||
|
key = kwargs.get("key", None) |
||||||
|
deep_key = kwargs.get("deep_key", None) |
||||||
|
struct_var = kwargs.get("struct_var", None) |
||||||
|
info = "" |
||||||
|
var_log_name = target_variable.name |
||||||
|
try: |
||||||
|
int_slot, size, offset, type_to = self.get_variable_info(contract, target_variable) |
||||||
|
except KeyError: |
||||||
|
# Only the child contract of a parent contract will show up in the storage layout when inheritance is used |
||||||
|
logger.info( |
||||||
|
f"\nContract {contract} not found in storage layout. It is possibly a parent contract\n" |
||||||
|
) |
||||||
|
return None |
||||||
|
|
||||||
|
slot = int.to_bytes(int_slot, 32, byteorder="big") |
||||||
|
|
||||||
|
if is_elementary(target_variable.type): |
||||||
|
type_to = target_variable.type.name |
||||||
|
|
||||||
|
elif is_array(target_variable.type) and key: |
||||||
|
info, type_to, slot, size, offset = self._find_array_slot( |
||||||
|
target_variable, slot, key, deep_key=deep_key, struct_var=struct_var |
||||||
|
) |
||||||
|
self.log += info |
||||||
|
|
||||||
|
elif is_user_defined_type(target_variable.type) and struct_var: |
||||||
|
var_log_name = struct_var |
||||||
|
elems = target_variable.type.type.elems_ordered |
||||||
|
info, type_to, slot, size, offset = self._find_struct_var_slot(elems, slot, struct_var) |
||||||
|
self.log += info |
||||||
|
|
||||||
|
elif is_mapping(target_variable.type) and key: |
||||||
|
info, type_to, slot, size, offset = self._find_mapping_slot( |
||||||
|
target_variable, slot, key, struct_var=struct_var, deep_key=deep_key |
||||||
|
) |
||||||
|
self.log += info |
||||||
|
|
||||||
|
int_slot = int.from_bytes(slot, byteorder="big") |
||||||
|
self.log += f"\nName: {var_log_name}\nType: {type_to}\nSlot: {int_slot}\n" |
||||||
|
logger.info(self.log) |
||||||
|
self.log = "" |
||||||
|
return { |
||||||
|
"type_string": type_to, |
||||||
|
"slot": int_slot, |
||||||
|
"size": size, |
||||||
|
"offset": offset, |
||||||
|
} |
||||||
|
|
||||||
|
def get_target_variables(self, **kwargs) -> None: |
||||||
|
""" |
||||||
|
Retrieves every instance of a given variable in a list of contracts. |
||||||
|
Should be called after setting `target_variables` with `get_all_storage_variables()`. |
||||||
|
**kwargs: |
||||||
|
key (str): Key of a mapping or index position if an array. |
||||||
|
deep_key (str): Key of a mapping embedded within another mapping or secondary index if array. |
||||||
|
struct_var (str): Structure variable name. |
||||||
|
""" |
||||||
|
for contract, var in self.target_variables: |
||||||
|
self._slot_info[f"{contract.name}.{var.name}"] = self.get_storage_slot( |
||||||
|
var, contract, **kwargs |
||||||
|
) |
||||||
|
|
||||||
|
def get_slot_values(self) -> SlotInfo: |
||||||
|
""" |
||||||
|
Fetches the slot values and inserts them in slot info dictionary. |
||||||
|
Returns: |
||||||
|
(`SlotInfo`): The dictionary of slot info. |
||||||
|
""" |
||||||
|
stack = list(self.slot_info.items()) |
||||||
|
while stack: |
||||||
|
_, v = stack.pop() |
||||||
|
if isinstance(v, dict): |
||||||
|
stack.extend(v.items()) |
||||||
|
if "slot" in v: |
||||||
|
hex_bytes = get_storage_data(self.web3, self.checksum_address, v["slot"]) |
||||||
|
v["value"] = self.convert_value_to_type( |
||||||
|
hex_bytes, v["size"], v["offset"], v["type_string"] |
||||||
|
) |
||||||
|
logger.info(f"\nValue: {v['value']}\n") |
||||||
|
return self.slot_info |
||||||
|
|
||||||
|
def get_all_storage_variables(self, func: Callable = None) -> None: |
||||||
|
"""Fetches all storage variables from a list of contracts. |
||||||
|
kwargs: |
||||||
|
func (Callable, optional): A criteria to filter functions e.g. name. |
||||||
|
""" |
||||||
|
for contract in self.contracts: |
||||||
|
self._target_variables.extend( |
||||||
|
filter( |
||||||
|
func, |
||||||
|
[ |
||||||
|
(contract, var) |
||||||
|
for var in contract.variables |
||||||
|
if not var.is_constant and not var.is_immutable |
||||||
|
], |
||||||
|
) |
||||||
|
) |
||||||
|
|
||||||
|
@staticmethod |
||||||
|
def _find_struct_var_slot( |
||||||
|
elems: List[StructureVariable], slot: bytes, struct_var: str |
||||||
|
) -> Tuple[str, str, bytes, int, int]: |
||||||
|
"""Finds the slot of a structure variable. |
||||||
|
Args: |
||||||
|
elems (List[StructureVariable]): Ordered list of structure variables. |
||||||
|
slot (bytes): The slot of the struct to begin searching at. |
||||||
|
struct_var (str): The target structure variable. |
||||||
|
Returns: |
||||||
|
info (str): Info about the target variable to log. |
||||||
|
type_to (str): The type of the target variable. |
||||||
|
slot (bytes): The storage location of the target variable. |
||||||
|
size (int): The size (in bits) of the target variable. |
||||||
|
offset (int): The size of other variables that share the same slot. |
||||||
|
""" |
||||||
|
slot = int.from_bytes(slot, "big") |
||||||
|
offset = 0 |
||||||
|
for var in elems: |
||||||
|
size = var.type.size |
||||||
|
if offset >= 256: |
||||||
|
slot += 1 |
||||||
|
offset = 0 |
||||||
|
if struct_var == var.name: |
||||||
|
type_to = var.type.name |
||||||
|
break # found struct var |
||||||
|
offset += size |
||||||
|
|
||||||
|
slot = int.to_bytes(slot, 32, byteorder="big") |
||||||
|
info = f"\nStruct Variable: {struct_var}" |
||||||
|
return info, type_to, slot, size, offset |
||||||
|
|
||||||
|
# pylint: disable=too-many-branches |
||||||
|
@staticmethod |
||||||
|
def _find_array_slot( |
||||||
|
target_variable: StateVariable, |
||||||
|
slot: bytes, |
||||||
|
key: int, |
||||||
|
deep_key: int = None, |
||||||
|
struct_var: str = None, |
||||||
|
) -> Tuple[str, str, bytes]: |
||||||
|
"""Finds the slot of array's index. |
||||||
|
Args: |
||||||
|
target_variable (`StateVariable`): The array that contains the target variable. |
||||||
|
slot (bytes): The starting slot of the array. |
||||||
|
key (int): The target variable's index position. |
||||||
|
deep_key (int, optional): Secondary index if nested array. |
||||||
|
struct_var (str, optional): Structure variable name. |
||||||
|
Returns: |
||||||
|
info (str): Info about the target variable to log. |
||||||
|
type_to (str): The type of the target variable. |
||||||
|
slot (bytes): The storage location of the target variable. |
||||||
|
""" |
||||||
|
info = f"\nKey: {key}" |
||||||
|
offset = 0 |
||||||
|
size = 256 |
||||||
|
|
||||||
|
if is_array( |
||||||
|
target_variable.type.type |
||||||
|
): # multidimensional array uint[i][], , uint[][i], or uint[][] |
||||||
|
size = target_variable.type.type.type.size |
||||||
|
type_to = target_variable.type.type.type.name |
||||||
|
|
||||||
|
if target_variable.type.is_fixed_array: # uint[][i] |
||||||
|
slot_int = int.from_bytes(slot, "big") + int(key) |
||||||
|
else: |
||||||
|
slot = keccak(slot) |
||||||
|
key = int(key) |
||||||
|
if target_variable.type.type.is_fixed_array: # arr[i][] |
||||||
|
key *= int(str(target_variable.type.type.length)) |
||||||
|
slot_int = int.from_bytes(slot, "big") + key |
||||||
|
|
||||||
|
if not deep_key: |
||||||
|
return info, type_to, int.to_bytes(slot_int, 32, "big"), size, offset |
||||||
|
|
||||||
|
info += f"\nDeep Key: {deep_key}" |
||||||
|
if target_variable.type.type.is_dynamic_array: # uint[][] |
||||||
|
# keccak256(keccak256(slot) + index) + floor(j / floor(256 / size)) |
||||||
|
slot = keccak(int.to_bytes(slot_int, 32, "big")) |
||||||
|
slot_int = int.from_bytes(slot, "big") |
||||||
|
|
||||||
|
# keccak256(slot) + index + floor(j / floor(256 / size)) |
||||||
|
slot_int += floor(int(deep_key) / floor(256 / size)) # uint[i][] |
||||||
|
|
||||||
|
elif target_variable.type.is_fixed_array: |
||||||
|
slot_int = int.from_bytes(slot, "big") + int(key) |
||||||
|
if is_user_defined_type(target_variable.type.type): # struct[i] |
||||||
|
type_to = target_variable.type.type.type.name |
||||||
|
if not struct_var: |
||||||
|
return info, type_to, int.to_bytes(slot_int, 32, "big"), size, offset |
||||||
|
elems = target_variable.type.type.type.elems_ordered |
||||||
|
slot = int.to_bytes(slot_int, 32, byteorder="big") |
||||||
|
info_tmp, type_to, slot, size, offset = SlitherReadStorage._find_struct_var_slot( |
||||||
|
elems, slot, struct_var |
||||||
|
) |
||||||
|
info += info_tmp |
||||||
|
|
||||||
|
else: |
||||||
|
type_to = target_variable.type.type.name |
||||||
|
size = target_variable.type.type.size # bits |
||||||
|
|
||||||
|
elif is_user_defined_type(target_variable.type.type): # struct[] |
||||||
|
slot = keccak(slot) |
||||||
|
slot_int = int.from_bytes(slot, "big") + int(key) |
||||||
|
type_to = target_variable.type.type.type.name |
||||||
|
if not struct_var: |
||||||
|
return info, type_to, int.to_bytes(slot_int, 32, "big"), size, offset |
||||||
|
elems = target_variable.type.type.type.elems_ordered |
||||||
|
slot = int.to_bytes(slot_int, 32, byteorder="big") |
||||||
|
info_tmp, type_to, slot, size, offset = SlitherReadStorage._find_struct_var_slot( |
||||||
|
elems, slot, struct_var |
||||||
|
) |
||||||
|
info += info_tmp |
||||||
|
|
||||||
|
else: |
||||||
|
slot = keccak(slot) |
||||||
|
slot_int = int.from_bytes(slot, "big") + int(key) |
||||||
|
type_to = target_variable.type.type.name |
||||||
|
size = target_variable.type.type.size # bits |
||||||
|
|
||||||
|
slot = int.to_bytes(slot_int, 32, byteorder="big") |
||||||
|
|
||||||
|
return info, type_to, slot, size, offset |
||||||
|
|
||||||
|
@staticmethod |
||||||
|
def _find_mapping_slot( |
||||||
|
target_variable: StateVariable, |
||||||
|
slot: bytes, |
||||||
|
key: Union[int, str], |
||||||
|
deep_key: Union[int, str] = None, |
||||||
|
struct_var: str = None, |
||||||
|
) -> Tuple[str, str, bytes, int, int]: |
||||||
|
"""Finds the data slot of a target variable within a mapping. |
||||||
|
target_variable (`StateVariable`): The mapping that contains the target variable. |
||||||
|
slot (bytes): The starting slot of the mapping. |
||||||
|
key (Union[int, str]): The key the variable is stored at. |
||||||
|
deep_key (int, optional): Key of a mapping embedded within another mapping. |
||||||
|
struct_var (str, optional): Structure variable name. |
||||||
|
:returns: |
||||||
|
log (str): Info about the target variable to log. |
||||||
|
type_to (bytes): The type of the target variable. |
||||||
|
slot (bytes): The storage location of the target variable. |
||||||
|
size (int): The size (in bits) of the target variable. |
||||||
|
offset (int): The size of other variables that share the same slot. |
||||||
|
|
||||||
|
""" |
||||||
|
info = "" |
||||||
|
offset = 0 |
||||||
|
if key: |
||||||
|
info += f"\nKey: {key}" |
||||||
|
if deep_key: |
||||||
|
info += f"\nDeep Key: {deep_key}" |
||||||
|
|
||||||
|
key_type = target_variable.type.type_from.name |
||||||
|
assert key |
||||||
|
if "int" in key_type: # without this eth_utils encoding fails |
||||||
|
key = int(key) |
||||||
|
key = coerce_type(key_type, key) |
||||||
|
slot = keccak(encode_abi([key_type, "uint256"], [key, decode_single("uint256", slot)])) |
||||||
|
|
||||||
|
if is_user_defined_type(target_variable.type.type_to) and is_struct( |
||||||
|
target_variable.type.type_to.type |
||||||
|
): # mapping(elem => struct) |
||||||
|
assert struct_var |
||||||
|
elems = target_variable.type.type_to.type.elems_ordered |
||||||
|
info_tmp, type_to, slot, size, offset = SlitherReadStorage._find_struct_var_slot( |
||||||
|
elems, slot, struct_var |
||||||
|
) |
||||||
|
info += info_tmp |
||||||
|
|
||||||
|
elif is_mapping(target_variable.type.type_to): # mapping(elem => mapping(elem => ???)) |
||||||
|
assert deep_key |
||||||
|
key_type = target_variable.type.type_to.type_from.name |
||||||
|
if "int" in key_type: # without this eth_utils encoding fails |
||||||
|
deep_key = int(deep_key) |
||||||
|
|
||||||
|
# If deep map, will be keccak256(abi.encode(key1, keccak256(abi.encode(key0, uint(slot))))) |
||||||
|
slot = keccak(encode_abi([key_type, "bytes32"], [deep_key, slot])) |
||||||
|
|
||||||
|
# mapping(elem => mapping(elem => elem)) |
||||||
|
type_to = target_variable.type.type_to.type_to.type |
||||||
|
byte_size, _ = target_variable.type.type_to.type_to.storage_size |
||||||
|
size = byte_size * 8 # bits |
||||||
|
offset = 0 |
||||||
|
|
||||||
|
if is_user_defined_type(target_variable.type.type_to.type_to) and is_struct( |
||||||
|
target_variable.type.type_to.type_to.type |
||||||
|
): # mapping(elem => mapping(elem => struct)) |
||||||
|
assert struct_var |
||||||
|
elems = target_variable.type.type_to.type_to.type.elems_ordered |
||||||
|
# If map struct, will be bytes32(uint256(keccak256(abi.encode(key1, keccak256(abi.encode(key0, uint(slot)))))) + structFieldDepth); |
||||||
|
info_tmp, type_to, slot, size, offset = SlitherReadStorage._find_struct_var_slot( |
||||||
|
elems, slot, struct_var |
||||||
|
) |
||||||
|
info += info_tmp |
||||||
|
|
||||||
|
# TODO: suppory mapping with dynamic arrays |
||||||
|
|
||||||
|
else: # mapping(elem => elem) |
||||||
|
type_to = target_variable.type.type_to.name # the value's elementary type |
||||||
|
byte_size, _ = target_variable.type.type_to.storage_size |
||||||
|
size = byte_size * 8 # bits |
||||||
|
|
||||||
|
return info, type_to, slot, size, offset |
||||||
|
|
||||||
|
@staticmethod |
||||||
|
def get_variable_info( |
||||||
|
contract: Contract, target_variable: StateVariable |
||||||
|
) -> Tuple[int, int, int, str]: |
||||||
|
"""Return slot, size, offset, and type.""" |
||||||
|
type_to = str(target_variable.type) |
||||||
|
byte_size, _ = target_variable.type.storage_size |
||||||
|
size = byte_size * 8 # bits |
||||||
|
(int_slot, offset) = contract.compilation_unit.storage_layout_of(contract, target_variable) |
||||||
|
offset *= 8 # bits |
||||||
|
logger.info( |
||||||
|
f"\nContract '{contract.name}'\n{target_variable.canonical_name} with type {target_variable.type} is located at slot: {int_slot}\n" |
||||||
|
) |
||||||
|
|
||||||
|
return int_slot, size, offset, type_to |
||||||
|
|
||||||
|
@staticmethod |
||||||
|
def convert_value_to_type( |
||||||
|
hex_bytes: HexBytes, size: int, offset: int, type_to: str |
||||||
|
) -> Union[int, bool, str, ChecksumAddress, hex]: |
||||||
|
"""Convert slot data to type representation.""" |
||||||
|
# Account for storage packing |
||||||
|
offset_hex_bytes = get_offset_value(hex_bytes, offset, size) |
||||||
|
try: |
||||||
|
value = coerce_type(type_to, offset_hex_bytes) |
||||||
|
except ValueError: |
||||||
|
return coerce_type("int", offset_hex_bytes) |
||||||
|
|
||||||
|
return value |
||||||
|
|
||||||
|
def _all_struct_slots( |
||||||
|
self, var: Union[StructureVariable, StructureContract], contract: Contract, key=None |
||||||
|
) -> Dict[str, SlotInfo]: |
||||||
|
"""Retrieves all members of a struct.""" |
||||||
|
if isinstance(var.type.type, StructureContract): |
||||||
|
struct_elems = var.type.type.elems_ordered |
||||||
|
else: |
||||||
|
struct_elems = var.type.type.type.elems_ordered |
||||||
|
data = {} |
||||||
|
for elem in struct_elems: |
||||||
|
info = self.get_storage_slot( |
||||||
|
var, |
||||||
|
contract, |
||||||
|
key=key, |
||||||
|
struct_var=elem.name, |
||||||
|
) |
||||||
|
data[elem.name] = info |
||||||
|
|
||||||
|
return data |
||||||
|
|
||||||
|
def _all_array_slots( |
||||||
|
self, var: ArrayType, contract: Contract, type_: Type, slot: int |
||||||
|
) -> Dict[int, SlotInfo]: |
||||||
|
"""Retrieves all members of an array.""" |
||||||
|
array_length = self._get_array_length(type_, slot) |
||||||
|
elems = {} |
||||||
|
if is_user_defined_type(type_.type): |
||||||
|
for i in range(min(array_length, self.max_depth)): |
||||||
|
elems[i] = self._all_struct_slots(var, contract, key=str(i)) |
||||||
|
continue |
||||||
|
|
||||||
|
else: |
||||||
|
for i in range(min(array_length, self.max_depth)): |
||||||
|
info = self.get_storage_slot( |
||||||
|
var, |
||||||
|
contract, |
||||||
|
key=str(i), |
||||||
|
) |
||||||
|
elems[i] = info |
||||||
|
|
||||||
|
if is_array(type_.type): # multidimensional array |
||||||
|
array_length = self._get_array_length(type_.type, info["slot"]) |
||||||
|
|
||||||
|
elems[i]["elems"] = {} |
||||||
|
for j in range(min(array_length, self.max_depth)): |
||||||
|
info = self.get_storage_slot( |
||||||
|
var, |
||||||
|
contract, |
||||||
|
key=str(i), |
||||||
|
deep_key=str(j), |
||||||
|
) |
||||||
|
|
||||||
|
elems[i]["elems"][j] = info |
||||||
|
return elems |
||||||
|
|
||||||
|
def _get_array_length(self, type_: Type, slot: int = None) -> int: |
||||||
|
"""Gets the length of dynamic and fixed arrays. |
||||||
|
Args: |
||||||
|
type_ (`Type`): The array type. |
||||||
|
slot (int, optional): Slot a dynamic array's length is stored at. |
||||||
|
Returns: |
||||||
|
(int): The length of the array. |
||||||
|
""" |
||||||
|
val = 0 |
||||||
|
if self.rpc: |
||||||
|
# The length of dynamic arrays is stored at the starting slot. |
||||||
|
# Convert from hexadecimal to decimal. |
||||||
|
val = int(get_storage_data(self.web3, self.checksum_address, slot).hex(), 16) |
||||||
|
if is_array(type_): |
||||||
|
if type_.is_fixed_array: |
||||||
|
val = int(str(type_.length)) |
||||||
|
|
||||||
|
return val |
||||||
@ -0,0 +1,11 @@ |
|||||||
|
from .utils import ( |
||||||
|
is_elementary, |
||||||
|
is_array, |
||||||
|
is_enum, |
||||||
|
is_mapping, |
||||||
|
is_struct, |
||||||
|
is_user_defined_type, |
||||||
|
get_offset_value, |
||||||
|
get_storage_data, |
||||||
|
coerce_type, |
||||||
|
) |
||||||
@ -0,0 +1,100 @@ |
|||||||
|
from typing import Union |
||||||
|
from hexbytes import HexBytes |
||||||
|
from eth_typing.evm import ChecksumAddress |
||||||
|
from eth_utils import to_int, to_text, to_checksum_address |
||||||
|
|
||||||
|
from slither.core.declarations import Structure, Enum |
||||||
|
from slither.core.solidity_types import ArrayType, MappingType, UserDefinedType, ElementaryType |
||||||
|
from slither.core.variables.state_variable import StateVariable |
||||||
|
|
||||||
|
|
||||||
|
def is_elementary(variable: StateVariable) -> bool: |
||||||
|
"""Returns whether variable is an elementary type.""" |
||||||
|
return isinstance(variable, ElementaryType) |
||||||
|
|
||||||
|
|
||||||
|
def is_array(variable: StateVariable) -> bool: |
||||||
|
"""Returns whether variable is an array.""" |
||||||
|
return isinstance(variable, ArrayType) |
||||||
|
|
||||||
|
|
||||||
|
def is_mapping(variable: StateVariable) -> bool: |
||||||
|
"""Returns whether variable is a mapping.""" |
||||||
|
return isinstance(variable, MappingType) |
||||||
|
|
||||||
|
|
||||||
|
def is_struct(variable: StateVariable) -> bool: |
||||||
|
"""Returns whether variable is a struct.""" |
||||||
|
return isinstance(variable, Structure) |
||||||
|
|
||||||
|
|
||||||
|
def is_enum(variable: StateVariable) -> bool: |
||||||
|
"""Returns whether variable is an enum.""" |
||||||
|
return isinstance(variable, Enum) |
||||||
|
|
||||||
|
|
||||||
|
def is_user_defined_type(variable: StateVariable) -> bool: |
||||||
|
"""Returns whether variable is a struct.""" |
||||||
|
return isinstance(variable, UserDefinedType) |
||||||
|
|
||||||
|
|
||||||
|
def get_offset_value(hex_bytes: HexBytes, offset: int, size: int) -> bytes: |
||||||
|
""" |
||||||
|
Trims slot data to only contain the target variable's. |
||||||
|
Args: |
||||||
|
hex_bytes (HexBytes): String representation of type |
||||||
|
offset (int): The size (in bits) of other variables that share the same slot. |
||||||
|
size (int): The size (in bits) of the target variable. |
||||||
|
Returns: |
||||||
|
(bytes): The target variable's trimmed data. |
||||||
|
""" |
||||||
|
size = int(size / 8) |
||||||
|
offset = int(offset / 8) |
||||||
|
if offset == 0: |
||||||
|
value = hex_bytes[-size:] |
||||||
|
else: |
||||||
|
start = size + offset |
||||||
|
value = hex_bytes[-start:-offset] |
||||||
|
return value |
||||||
|
|
||||||
|
|
||||||
|
def coerce_type(solidity_type: str, value: bytes) -> Union[int, bool, str, ChecksumAddress, hex]: |
||||||
|
""" |
||||||
|
Converts input to the indicated type. |
||||||
|
Args: |
||||||
|
solidity_type (str): String representation of type. |
||||||
|
value (bytes): The value to be converted. |
||||||
|
Returns: |
||||||
|
(Union[int, bool, str, ChecksumAddress, hex]): The type representation of the value. |
||||||
|
""" |
||||||
|
if "int" in solidity_type: |
||||||
|
converted_value = to_int(value) |
||||||
|
elif "bool" in solidity_type: |
||||||
|
converted_value = bool(to_int(value)) |
||||||
|
elif "string" in solidity_type: |
||||||
|
# length * 2 is stored in lower end bits |
||||||
|
# TODO handle bytes and strings greater than 32 bytes |
||||||
|
length = int(int.from_bytes(value[-2:], "big") / 2) |
||||||
|
converted_value = to_text(value[:length]) |
||||||
|
|
||||||
|
elif "address" in solidity_type: |
||||||
|
converted_value = to_checksum_address(value) |
||||||
|
else: |
||||||
|
converted_value = value.hex() |
||||||
|
|
||||||
|
return converted_value |
||||||
|
|
||||||
|
|
||||||
|
def get_storage_data(web3, checksum_address: ChecksumAddress, slot: bytes) -> HexBytes: |
||||||
|
""" |
||||||
|
Retrieves the storage data from the blockchain at target address and slot. |
||||||
|
Args: |
||||||
|
web3: Web3 instance provider. |
||||||
|
checksum_address (ChecksumAddress): The address to query. |
||||||
|
slot (bytes): The slot to retrieve data from. |
||||||
|
Returns: |
||||||
|
(HexBytes): The slot's storage data. |
||||||
|
""" |
||||||
|
return bytes(web3.eth.get_storage_at(checksum_address, slot)).rjust( |
||||||
|
32, bytes(1) |
||||||
|
) # pad to 32 bytes |
||||||
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Reference in new issue