Usage

Authentication

Basic MythX services are free of charge. No payment information or email address are required and you can start using MythX right away by signing up for an account here. Once set up, head over to the dashboard. In the Profile section various means of authentication are presented.

Using API Tokens

This is the recommended way of authenticating with the MythX smart contract analysis API. In the Tools section there is an elements labeled “MythX API Key”. To generate a new API key, the account password must be entered:

On successful authentication a new JWT token is generated, which can be used for further authentication by API clients. It will only be shown once and can be copied using the icon on the right of the truncated secret string. If the token is lost, a new one can be generated again in the same way as explained above.

This key can be passed to the MythX CLI either as an environment variable names MYTHX_API_KEY or as an explicit parameter --api-key. For security reasons it is recommended to always pass the token through an environment variable, e.g. defined in the settings of a Continuous Integration (CI) server or a shell script that can be sourced from.

Using Address and Password (not recommended)

Alternatively, username and password can be used for authentication. This is not recommended as a potential attacker can get access to the MythX account as a whole if these credentials are leaked. For compatibility reasons this functionality has been included, however it is to be expected that this API feature will be disabled in the future.

The username corresponds to the Ethereum address the MythX account has been registered under, and the password is the one that has been set during registration, or separately in the MythX dashboard. Both can be passed either explicitly using the --username and --password option respectively, or by setting the MYTHX_USERNAME and MYTHX_PASSWORD environment variables.

Note that if username and password, as well as an API token are given, the API token will always take precedence and no login action using the provided credentials will be performed.

The Analysis Functionality

Submitting Analyses

$ mythx analyze --help
Usage: mythx analyze [OPTIONS] [TARGET]...

Analyze the given directory or arguments with MythX.

Options:
--async / --wait      Submit the job and print the UUID, or wait for
                        execution to finish
--mode [quick|full]   [default: quick]
--create-group        Create a new group for the analysis
--group-id TEXT       The group ID to add the analysis to
--group-name TEXT     The group name to attach to the analysis
--min-severity TEXT   Ignore SWC IDs below the designated level
--swc-blacklist TEXT  A comma-separated list of SWC IDs to ignore
--swc-whitelist TEXT  A comma-separated list of SWC IDs to include
--solc-version TEXT   The solc version to use for compilation
--help                Show this message and exit.

Submit a new analysis to the MythX API. This command works in different scenarios, simply by calling mythx analyze:

1. Either truffle-config.js or truffle.js are found in the directory. In this case, the MythX CLI checks the <project_dir>/build/contracts path for artifact JSON files generated by the truffle compile command. For each artifact found a new job is submitted to the MythX API.
2. If no Truffle project can be detected, the MythX CLI will automatically enumerate all Solidity files (having the .sol extension) in the current directory and all subdirectories. A prompt will be displayed asking the user to confirm the submission of the number of smart contracts found. This is done to make sure a user does not accidentally submit a huge repository of Solidity files (unless they actually want it). For automation purposes the prompt can be automatically confirmed by providing the -y/--yes option, e.g. mythx --yes analyze.
3. To analyze specific Solidity files or bytecode, data can also explicitly be passed to the analyze subcommand. The argument can be a list of creation bytecode strings (beginning with 0x) and Solidity files (valid files ending with with .sol). The arguments can have arbitrary order and for each a new analysis request will be submitted. Otherwise, a directory may be passed. The MythX CLI will then proceed to recursively enumerate all Solidity files in the given directory and add them for submission, similar to the previous point.

If a Solidity file is analyzed in any of the given scenarios, the MythX CLI will attempt to automatically compile the file and obtain data such as the creation bytecode and the Solidity AST to enrich the request data submitted to the MythX API. This will increase the number of detected issues (as e.g. symbolic execution tools in the MythX backend can pick up on the bytecode), as well as reduce the number of false positive issues. The MythX CLI will try to infer the solc version based on the pragma set in the source code.

Fetching the Analysis Status

Usage: mythx analysis status [OPTIONS] [UUIDS]...

Options:
--help  Show this message and exit.

This subcommand prints the status of an already submitted analysis.:

$ mythx --format=simple analysis status 381eff48-04db-4f81-a417-8394b6614472
UUID: 381eff48-04db-4f81-a417-8394b6614472
Submitted at: 2019-09-05 20:34:27.606000+00:00
Status: Finished

By default a simple text representation is printed to stdout. More data on the MythX API’s status response can be obtained by specifying a different output format such as json-pretty.

Fetching Analysis Reports

Usage: mythx analysis report [OPTIONS] [UUIDS]...

Options:
--help  Show this message and exit.

This subcommand prints the report of one or more finished analyses in the user-specified format. By default, it will print a tabular representation of the report to stdout:

$ mythx analysis report f9e69a6a-2339-43b0-ad03-125c6cf81a70

Report for /home/circleci/project/contracts/token.sol
https://dashboard.mythx.io/#/console/analyses/f9e69a6a-2339-43b0-ad03-125c6cf81a70
╒════════╤═══════════════════════════════════╤════════════╤═══════════════════════════════════════════╕
│   Line │ SWC Title                         │ Severity   │ Short Description                         │
╞════════╪═══════════════════════════════════╪════════════╪═══════════════════════════════════════════╡
│     14 │ Integer Overflow and Underflow    │ High       │ The binary addition can overflow.         │
├────────┼───────────────────────────────────┼────────────┼───────────────────────────────────────────┤
│     13 │ Integer Overflow and Underflow    │ High       │ The binary subtraction can underflow.     │
├────────┼───────────────────────────────────┼────────────┼───────────────────────────────────────────┤
│      1 │ Floating Pragma                   │ Low        │ A floating pragma is set.                 │
├────────┼───────────────────────────────────┼────────────┼───────────────────────────────────────────┤
│      5 │ State Variable Default Visibility │ Low        │ The state variable visibility is not set. │
╘════════╧═══════════════════════════════════╧════════════╧═══════════════════════════════════════════╛

The simple format option will also resolve the report’s source map locations to the corresponding line and column numbers in the Solidity source file. This is only possible if the user has specified the source map in their request and is passing the Solidity source code as text.:

$ mythx --format=simple analysis report ab9092f7-54d0-480f-9b63-1bb1508280e2
UUID: ab9092f7-54d0-480f-9b63-1bb1508280e2
Title: Assert Violation (Low)
Description: It is possible to trigger an exception (opcode 0xfe). Exceptions can be caused by type errors, division by zero, out-of-bounds array access, or assert violations. Note that explicit `assert()` should only be used to check invariants. Use `require()` for regular input checking.


/home/spoons/diligence/mythx-qa/land/contracts/estate/EstateStorage.sol:24
  mapping(uint256 => uint256[]) public estateLandIds;

Listing Past Analyses

Usage: mythx analysis list [OPTIONS]

Options:
--number INTEGER RANGE  The number of most recent analysis jobs to display
--help                  Show this message and exit.

This subcommand lists the past analyses associated to the current user.

By default this subcommand will list the past five analyses associated to the authenticated user account. The number of returned analyses can be updated by passing the --number option. It is worth noting that at the time of writing this document the API only returns 20 analysis status objects per call. If a number greater than this is passed to mythx analysis list, the MythX CLI will automatically query the next page until the desired number is reached.

To prevent too many network requests, the maximum number of analyses that can be fetched it capped at 100.:

$ mythx analysis list
╒══════════════════════════════════════╤══════════╤═════════════════╤══════════════════════════════════╕
│ ac5af0dd-bd78-4cfb-b4ed-32f21216aaf6 │ Finished │ mythx-cli-0.2.1 │ 2019-10-30 09:41:36.165000+00:00 │
├──────────────────────────────────────┼──────────┼─────────────────┼──────────────────────────────────┤
│ 391db48f-9e89-424f-8063-7626fdd2051e │ Finished │ mythx-cli-0.2.1 │ 2019-10-30 09:40:59.868000+00:00 │
├──────────────────────────────────────┼──────────┼─────────────────┼──────────────────────────────────┤
│ 5a1fc208-7a7f-425a-bbc5-8512e5c37b50 │ Finished │ mythx-cli-0.2.1 │ 2019-10-30 09:40:06.092000+00:00 │
├──────────────────────────────────────┼──────────┼─────────────────┼──────────────────────────────────┤
│ 1667a99d-6335-4a71-aa78-0d729e25b8e1 │ Finished │ mythx-cli-0.2.1 │ 2019-10-30 09:39:47.736000+00:00 │
├──────────────────────────────────────┼──────────┼─────────────────┼──────────────────────────────────┤
│ fa88b710-e423-4535-a7b1-0c8c71833724 │ Finished │ mythx-cli-0.2.1 │ 2019-10-30 09:38:23.064000+00:00 │
╘══════════════════════════════════════╧══════════╧═════════════════╧══════════════════════════════════╛

The Grouping Functionality

Usage: mythx group [OPTIONS] COMMAND [ARGS]...

  Create, modify, and view analysis groups.

Options:
  --help  Show this message and exit.

Commands:
  close   Close/seal an existing group.
  list    Get a list of analysis groups.
  open    Create a new group to assign future analyses to.
  status  Get the status of an analysis group.

A group can be regarded as a batch of analyses. They is supposed to capture groups of related analyses and display them in an easy-to-read overview in the MythX dashboard overview.

Opening Groups

To open a new group, simply type:

$ mythx group open "super important"
Opened group with ID 5df7c8932a73230011271d27 and name 'super important'

The name is optional and can be omitted if not needed.

Adding Analyses to a Group

To analyze a sample, simply pass the group ID (and optionally the name) as parameters to the mythx analyze call:

This will associate the individual analysis jobs to the same group in the MythX Dashboard:

Closing Groups

After all data has been submitted, the group must be closed again:

$ mythx group close 5df7c8932a73230011271d27
Closed group with ID 5df7c8932a73230011271d27 and name 'super important'

MythX analysis groups will always stay open until explicitly closed.

Fetching the Group Status

$ mythx group status 5e0f761d5171cc001109dd18
╒══════════════════════════════════╤═════════════════════════════════════════════════╕
│ ID                               │ 5e0f761d5171cc001109dd18                        │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Name                             │ <unnamed>                                       │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Creation Date                    │ 2020-01-03 17:13:01+0000                        │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Created By                       │ 5c2e4e843204d7001402aedc                        │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Progress                         │ 100/100                                         │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Main Sources                     │ /home/x-dag-ts/project/contracts/sample-127.sol │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Status                           │ Sealed                                          │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Queued Analyses                  │ 0                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Running Analyses                 │ 0                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Failed Analyses                  │ 0                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Finished Analyses                │ 6                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Total Analyses                   │ 6                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ High Severity Vulnerabilities    │ 3                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Medium Severity Vulnerabilities  │ 1                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Low Severity Vulnerabilities     │ 8                                               │
├──────────────────────────────────┼─────────────────────────────────────────────────┤
│ Unknown Severity Vulnerabilities │ 0                                               │
╘══════════════════════════════════╧═════════════════════════════════════════════════╛

This subcommand fetches status information on one of multiple given group IDs. This will show an overview over the submission time, analysis progress, the group status, as well as various statistics over the number of Vulnerabilities that have been found once the analysis is completed.

Listing Groups

$ mythx group list
╒══════════════════════════╤════════╤════════════════╤══════════════════════════╕
│ 5e0f761dae12730019ac7c95 │ sealed │ token.sol      │ 2020-01-03 17:13:01+0000 │
├──────────────────────────┼────────┼────────────────┼──────────────────────────┤
│ 5e0f7398bf92eb00111df09f │ sealed │ token.sol      │ 2020-01-03 17:02:16+0000 │
╘══════════════════════════╧════════╧════════════════╧══════════════════════════╛

This will show an overview over all the user-defined groups. It behaves similar to the analysis list command, and the maximum number of returned results can also be updated by passing the --number option.

Format Options

A format option is passed to the --format option of the mythx root command. E.g.:

$ mythx --format json-pretty analysis report ab9092f7-54d0-480f-9b63-1bb1508280e2

This will print the report for the given analysis job UUID in pretty-printed JSON format to stdout. Currently the following formatters are available:

• tabular (default): Print the results in a pretty (extended) ASCII table.
• simple: Print the results in simple plain text (easy to grep). This does not include all result data but a subset of it that seems relevant for most use-cases.
• json: Print all of the result data as a single-line JSON string to stdout.
• json-pretty: The same as json, just pretty-printed, with an indentation of two spaces and alphabetically sorted object keys.
• sonar: Print the results as JSON objects that can be interpreted by SonarQube.

API Version Information

Usage: mythx version [OPTIONS]

Options:
--help  Show this message and exit.

This subcommand hits the MythX API’s /version endpoint and obtains version information on the API. This can be especially useful for continuous scans as the backend tool capabilities of MythX are constantly being improved. This means that it’s a good idea to rerun old scans with newer versions of MythX as potentially more vulnerabilities can be found, false positives are removed, and additional helpful data can be returned.

The MythX team has included a hash of all versions so changes are easily noticed simply by comparing the hash an analysis has run under with the one returned by the API.:

$ mythx version
API: v1.4.34.4
Harvey: 0.0.33
Maru: 0.5.3
Mythril: 0.21.14
Hashed: 00c17c8b0ae13bebc9a7f678d8ee55db

This output can be adapted using the --format parameter as well to fetch e.g. JSON output for easier parsing.