Static Analyzer for Solidity
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slither/README.md

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Slither, the Solidity source analyzer

Build Status Slack Status

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
  • Identifies where the error condition occurs in the source code
  • Easy integration into continuous integration pipelines
  • 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
  • Intermediate representation (SlithIR) enables simple, high-precision analyses

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 to solc (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 detector name 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 relations
  • --printer-inheritance-graph: Print the inheritance graph in a file
  • --printer-vars-and-auth: Print the variables written and the check on msg.sender of each function

Checks available

By default, all the checks are run. Use --detect-name-of-check to run one check at a time.

Num Check What it Detects Impact Confidence
1 suicidal Suicidal functions High High
2 uninitialized-state Uninitialized state variables High High
3 uninitialized-storage Uninitialized storage variables High High
4 arbitrary-send Functions that send ether to an arbitrary destination High Medium
5 reentrancy Reentrancy vulnerabilities High Medium
6 locked-ether Payable functions that do not send ether Medium High
7 tx-origin Dangerous usage of tx.origin Medium Medium
8 assembly Assembly usage Informational High
9 low-level-calls Low level calls Informational High
10 naming-convention Conformance to Solidity naming conventions Informational High
11 pragma If different pragma directives are used Informational High
12 solc-version If an old version of Solidity used (<0.4.23) Informational High
13 unused-state 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.

Using Pip

$ pip install slither-analyzer

Using Git

$ 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.

License

Slither is licensed and distributed under the AGPLv3 license. Contact us if you're looking for an exception to the terms.