truffle-sca2t (Smart Contract Audit Assistant Tool): A set of utilities for auditing Solidity contracts.

truffle-sca2t is a plugin of Truffle framework and an assistant tool for smart contract auditing. It provides some utilities to help your smart contract auditing and make your smart contract more secure and safe. The plugin is compatible with Truffle 5.0 or higher.

sca2t pronunciation is like skärt.

• Getting Started
• Configuration
• Command List
  • 1. mythx
    • 1-1. Generate Test Code File of mocha
    • 1-2. Postman Support
    • 1-3. Command Line Interface Mode
    • 1-4. Advanced Options
  • 2. dependencies
  • 3. eventgen
• License

Getting Started

Install it via npm:

$ npm install truffle-sca2t

If you want to install it globally, you need to install it with the mocha test framework and the report generator mocha-simple-html-reporter.

$ npm install -g truffle-sca2t mocha mocha-simple-html-reporter

Configuration

Add "truffle-sca2t" to the list of plugins in truffle-config.js in the root directory of your Truffle project. If you don't have any other plugins, your configuration would get changed to something like:

module.exports = {
   plugins: [ "truffle-sca2t" ],
   /* truffle by default adds other stuff here below like... */
   /**
   * Networks define how you connect to your ethereum client and let you set the
   * defaults web3 uses to send transactions. If you don't specify one truffle
   ...
};

If you have other plugins already installed, like my-awesome-plugin the plugins line would look like:

    plugins: [ "truffle-sca2t", "my-awsome-plugin" ],

Command List

1. mythx

This command can be used in 3 ways.

Testing for CI

The mythx command submits contract code to the MythX service. MythX reports back potential vulnerabilities and errors in a MythX log. After this completes you can check the results using npm run test:security.

This two-step process can easily be integrated into your CI since it does not depend on specific CI products such as Circle CI, Travis CI or Jenkins. If you'd like to set up for CircleCI CI testing, see this CircleCI configuration file. Here is a failure CircleCI run.

Testing via Postman

The mythx command generates a Postman Collection File which can be used in testing. See Postman Support for more information.

MythX Results via the Command Line

If you just want to use this as a MythX client tool, you can use the command line interface mode. See Command Line Interface Mode for more information.

Get prior MythX results

See Command Line Interface Mode.

1-1. Generate Test Code File for Mocha testing

To run the examples in this section, do the following first:

$ git clone git@github.com:tagomaru/truffle-sca2t-sample.git
Cloning into 'truffle-sca2t-sample'...
...
Resolving deltas: 100% (1/1), done.
$ cd truffle-sca2t-sample

1-1-1. MythX Account

You can set up an account on the MythX website to get full access.

After setting up an account, set the following environment variables to your ETH address and password (add this to your .bashrc or .bash_profile for added convenience):

export MYTHX_ETH_ADDRESS=0x1234567891235678900000000000000000000000
export MYTHX_PASSWORD='Put your password in here!'

1-1-2. Generate Test Code Files

$ truffle run mythx A.sol

or you can give multiple contracts:

$ truffle run mythx A.sol C.sol

The below is the same as the above but with explicit paths. Use the "tab" key for autocompletion.

$ truffle run mythx contracts/A.sol contracts/C.sol

Although you can list multiple contracts, the plugin mythx command will automatically include files that have dependencies. For example,

A.sol:

pragma solidity ^0.5.0;
import "./C.sol";
contract A is C {}
contract B {}

C.sol:

pragma solidity ^0.5.0;
contract C {
  uint public a;
  function add(uint b) public {
    a = a + b;
  }
}

The command truffle run mythx A.sol generates test code file test_A.sol_.js; in doing so it sees that A.sol imports C.sol. The test code file then sends AST and source code for not only A but also C to MythX API at the same time. You can see the data sent here.

Therefore in the command-line invocations given above the first command truffle run mythx A.sol is equivalent to the two other examples below it.

1-1-3. Configuration For Your CI

This command automatically generates sca2t configuration file,sca2t-config.js, in your project root if there is none already. In that nodejs file, you can customize the report format, add SWCs that MythX should not report, and so on.

1-1-4. Run The Test Code Files

After test code files are successfully generated from the mythx command, you can then run mocha test this way:

$ npm run test:security

If you want a beautiful HTML report (recommended), execute the below command.

$ npm run test:security:html

security-report.html is generated on your project root. The report file of A looks like this - as you can see, the file reports the vulnerability of C:

And you can see the report here.

1-1-5. Get an analysis result from a previous run

Sometimes MythX takes a long time to analyze contracts, or you might like to see a report for a job that was submitted in the past. When you submit a MythX job you should get a UUID back. With this UUID you can get a report like this:

$ truffle run mythx --uuid='your UUID'

1-2. Postman Support

Postman is a tool for working with MythX at the API level. You can set HTTP headers, see HTTP responses for HTTP GETs, and POSTs and so on. This is great for seeing what goes over the network at the HTTP level. You can also use this for testing instead of using mocha.

1-2-1. Generate a Postman Collection File

Use the --postman option to create a Postman Collection which can be used in testing to see that no contracts have vulnerabilities.

For example:

$ truffle run mythx contracts/A.sol --postman
Generating Postman collection file:... done.
Please import ./pm-collection-mythx.json in Postman
Also, you should set an ethAddress and password in Postman environment variables.

As before, you can create a Postman collection with multiple Solidity contracts:

$ truffle run mythx contracts/A.sol contracts/C.sol --postman

As before, if C.sol is imported by A.sol then it need not be listed explicitly.

1-2-2. Import Postman Collection File in Postman

Import the generated file in Postman. You need to set ethAddress and password to the values in your MythX account as Postman environment variables.

Currently, this supports the below requests.

1. login
2. submit analysis
3. get status
4. get issues

1-3. Command Line Interface Mode

If you do not want test a code file and just want the results, add the --cli option.

$ truffle run mythx A.sol --cli

The--markdown option gives the results in markdown format.

$ truffle run mythx A.sol --cli --markdown

• report image

The sample is here (the emoji is optional).

1-4. Advanced Options

Run truffle run mythx --help to show advanced configuration options.

$ truffle run mythx --help
Usage: truffle run mythx [*file-name1* [*file-name2*] ...]
  e.g.: truffle run mythx contracts/A.sol contracts/sub/C.sol

Options:
  --help      print help.
  --uuid      get analysis report with UUID.
  --postman   generate Postman collection file.
  --cli       analyze in cli mode.
  --markdown  generate markdown format report in cli mode.
  --emoji     insert emoji in markdown format report. (Only support GitHub Flavored Markdown)

2. dependencies

The dependencies command outputs a diagram in HTML to visualize dependencies among contracts. Boxes shown in the report are draggable to allow you to reorganize the display as you like. Information such as contracts, functions, dependencies of inheritance, declarations, and user-definded types are shown. Contracts and functions in EthPM and NPM packages are included in searching for information.

$ truffle run dependencies A.sol

or as before with several contracts:

$ truffle run dependencies A.sol C.sol

3. eventgen

The eventgen can help you track contract and function calls. It changes the Solidity contract file(s). Specifically it wraps tracing instrumentation around functions and contracts, after first prompting if you would like a backup of the Solidity files to be changed. View functions are not wrapped.

$ truffle run eventgen contracts/A.sol contracts/C.sol

or to run eventgen over all Solidity files:

$ find contracts -name "*.sol" | xargs truffle run eventgen

License

MIT