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README.md
Slither, the Solidity source analyzer
Slither is a Solidity static analysis framework written in Python 3. It runs a suite of vulnerability detectors, prints visual information about contract details, and provides an API to easily write custom analyses. Slither enables developers to find vulnerabilities, enhance their code comphrehension, and quickly prototype custom analyses.
Features
- Detects vulnerable Solidity code with low false positives
- Detection of most major smart contract vulnerabilities
- Detection of poor coding practices
- Identifies where the error condition occurs in the source code
- Easy integration into continuous integration pipelines
- Four built-in 'printers' quickly report crucial contract information
- Detector API to write custom analyses in Python
- Ability to analyze contracts written with Solidity > 0.4
Slither possesses it's own intermediate representation, called SlithIR.
Usage
$ slither tests/uninitialized.sol
[..]
INFO:Detectors:Uninitialized state variables in tests/uninitialized.sol, Contract: Uninitialized, Vars: destination, Used in ['transfer']
[..]
If Slither is run on a directory, it will run on every .sol
file of the directory. All vulnerability checks are run by default.
Configuration
--solc SOLC
: Path tosolc
(default 'solc')--solc-args SOLC_ARGS
: Add custom solc arguments.SOLC_ARGS
can contain multiple arguments--disable-solc-warnings
: Do not print solc warnings--solc-ast
: Use the solc AST file as input (solc file.sol --ast-json > file.ast.json
)--json FILE
: Export results as JSON--exclude-name
: Excludes the detectorname
from analysis
Printers
--printer-summary
: Print a summary of the contracts--printer-quick-summary
: Print a quick summary of the contracts--printer-inheritance
: Print the inheritance graph--printer-vars-and-auth
: Print the variables written and the check onmsg.sender
of each function
Checks available
By default, all the checks are run.
Check | Purpose | Impact | Confidence |
---|---|---|---|
--detect-arbitrary-send |
Detect functions sending ethers to an arbitrary destination | High | Medium |
--detect-reentrancy |
Detect reentrancy vulnerabilities | High | Medium |
--detect-suicidal |
Detect suicidal functions | High | High |
--detect-uninitialized-state |
Detect uninitialized state variables | High | High |
--detect-uninitialized-storage |
Detect uninitialized storage variables | High | High |
--detect-locked-ether |
Detect contracts with payable functions that do not send ether | Medium | High |
--detect-tx-origin |
Detect dangerous usage of tx.origin |
Medium | Medium |
--detect-pragma |
Detect if different pragma directives are used | Informational | High |
--detect-solc-version |
Detect if an old version of Solidity used (<0.4.23) | Informational | High |
--detect-unused-state |
Detect unused state variables | Informational | High |
Contact us to get access to additional detectors.
How to install
Slither requires Python 3.6+ and solc, the Solidity compiler.
$ git clone https://github.com/trailofbits/slither.git && cd slither
$ python setup.py install
Getting Help
Feel free to stop by our Slack channel (#ethereum) for help using or extending Slither.
-
The Printer documentation describes the information Slither is capable of visualizing for each contract.
-
The Detector documentation describes how to write a new vulnerability analyses.
-
The API documentation describes the methods and objects available for custom analyses.
-
The SlithIR documentation describes the SlithIR intermediate representation.
License
Slither is licensed and distributed under the AGPLv3 license. Contact us if you're looking for an exception to the terms.