Modsurfer by Dylibso is an application to help teams debug and observe their WebAssembly modules and components. It scans WASM binaries and extracts critical information about the code contained within, as well as makes WASM code searchable and visible to the teams creating and executing it. See a demo of the Modsurfer application here: https://modsurfer.app
This GitHub Action runs Modsurfer's CLI, found here, using
the validate command. This command expects two inputs:
- path (
-pfrom the CLI): pointing to the .wasm file to validate - check (
-cfrom the CLI): pointing to the YAML file (default:mod.yaml) to validate against
To use this action, add the following step in your workflow:
# ...
steps:
- uses: actions/checkout@v3
- name: modsurfer validate
uses: dylibso/modsurfer-validate-action@main
with:
path: path/to/your.wasm
check: path/to/mod.yamlAn example mod.yaml (a "check file") could be:
# For more information about other checkfile options, see the documentation at https://dev.dylib.so/docs/modsurfer/cli#checkfile
validate:
# mandate that WASI support is allowed or not
allow_wasi: false
# define requirements for existence (or non-existence) of a module's import functions
imports:
include:
# specify the function and its signature, optionally scoping it to a particular module name / namespace
- name: http_get
namespace: env
params:
- I32
- I32
results:
- I32
# or, simply use the function name
- log_message
- proc_exit
exclude:
- fd_write
# declare module-wide requirements for existence (or non-existence) of imports from modules / namespaces
namespace:
include:
- env
exclude:
- some_future_deprecated_module_name
- wasi_snapshot_preview1
# define requirements for existence (or non-existence) of a module's export functions
exports:
# set a threshold for maximum number of exports
max: 2
include:
- name: _start
params: []
results: []
- name: bar
params:
- I32
- I32
results:
- I32
exclude:
- main
- foo
# restrict binary size of a module (supports suffixes listed here: https://docs.rs/parse-size/1.0.0/parse_size/index.html)
size:
max: 4MB
# restrict WASM code complexity to a risk profile (low, medium, high) based on Cyclomatic Complexity analysis
complexity:
max_risk: lowWhen a module fails to validate against the provided check file, a report is printed (seen below), and will issue a non-zero exit code, failing the CI workflow.
┌────────┬──────────────────────────────────────────────────┬──────────┬──────────┬───────────────────┬────────────┐
│ Status │ Property │ Expected │ Actual │ Classification │ Severity │
╞════════╪══════════════════════════════════════════════════╪══════════╪══════════╪═══════════════════╪════════════╡
│ FAIL │ allow_wasi │ false │ true │ ABI Compatibility │ |||||||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ complexity.max_risk │ <= low │ medium │ Resource Limit │ | │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ exports.exclude.main │ excluded │ included │ Security │ ||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ exports.include.bar │ included │ excluded │ ABI Compatibility │ |||||||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ exports.max │ <= 100 │ 151 │ Security │ |||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ imports.include.http_get │ included │ excluded │ ABI Compatibility │ |||||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ imports.include.log_message │ included │ excluded │ ABI Compatibility │ |||||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ imports.namespace.exclude.wasi_snapshot_preview1 │ excluded │ included │ ABI Compatibility │ |||||||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ imports.namespace.include.env │ included │ excluded │ ABI Compatibility │ |||||||| │
├────────┼──────────────────────────────────────────────────┼──────────┼──────────┼───────────────────┼────────────┤
│ FAIL │ size.max │ <= 4MB │ 4.4 MiB │ Resource Limit │ | │
└────────┴──────────────────────────────────────────────────┴──────────┴──────────┴───────────────────┴────────────┘
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