slither/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
• Identifies where the error condition occurs in the source code
• Easy integration into continuous integration and Truffle builds
• 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

Run Slither on a Truffle application:

slither .

Run Slither on a single file:

$ slither tests/uninitialized.sol 
[..]
INFO:Detectors:
Uninitialized.destination (tests/uninitialized.sol#5) is never initialized. It is used in:
	- transfer (tests/uninitialized.sol#7-9)
Reference: https://github.com/trailofbits/slither/wiki/Vulnerabilities-Description#uninitialized-state-variables
[..]

Slither can be run on:

• A .sol file
• A Truffle directory
• A directory containing *.sol files (all the *.sol files will be analyzed)
• A glob (be sure to quote the argument when using a glob)

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

Detectors

By default, all the detectors are run.

Num	Detector	What it Detects	Impact	Confidence
1	suicidal	Functions allowing anyone to destruct the contract	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 arbitrary destinations	High	Medium
5	controlled-delegatecall	Controlled delegatecall destination	High	Medium
6	reentrancy	Reentrancy vulnerabilities	High	Medium
7	locked-ether	Contracts that lock ether	Medium	High
8	constant-function	Constant functions changing the state	Medium	Medium
9	tx-origin	Dangerous usage of tx.origin	Medium	Medium
10	uninitialized-local	Uninitialized local variables	Medium	Medium
11	unused-return	Unused return values	Medium	Medium
12	assembly	Assembly usage	Informational	High
13	constable-states	State variables that could be declared constant	Informational	High
14	external-function	Public function that could be declared as external	Informational	High
15	low-level-calls	Low level calls	Informational	High
16	naming-convention	Conformance to Solidity naming conventions	Informational	High
17	pragma	If different pragma directives are used	Informational	High
18	solc-version	Old versions of Solidity (< 0.4.23)	Informational	High
19	unused-state	Unused state variables	Informational	High

Contact us to get access to additional detectors.

Printers

To run a printer, use --print and a comma-separated list of printers.

Num	Printer	Description
1	call-graph	Export the call-graph of the contracts to a dot file
2	contract-summary	Print a summary of the contracts
3	function-summary	Print a summary of the functions
4	human-summary	Print a human readable summary of the contracts
5	inheritance	Print the inheritance relations between contracts
6	inheritance-graph	Export the inheritance graph of each contract to a dot file
7	slithir	Print the slithIR representation of the functions
8	vars-and-auth	Print the state variables written and the authorization of the functions

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.

• 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.