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ci: harden workflow install boundaries

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- run non-test workflow installs with npm ci --ignore-scripts where lifecycle scripts are not needed\n- reject plain npm ci in workflows with write permissions\n- reject actions/cache in id-token: write workflows to reduce OIDC publish cache-poisoning risk
This commit is contained in:
Affaan Mustafa
2026-05-12 21:55:36 -04:00
committed by GitHub
parent 33db548be3
commit daf0355531
4 changed files with 52 additions and 2 deletions
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27
scripts/ci/validate-workflow-security.js
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@@ -24,6 +24,11 @@ const RULES = [
},
];
const WRITE_PERMISSION_PATTERN = /^\s*(?:contents|issues|pull-requests|actions|checks|deployments|discussions|id-token|packages|pages|repository-projects|security-events|statuses):\s*write\b/m;
const NPM_CI_PATTERN = /\bnpm\s+ci\b(?![^\n]*--ignore-scripts)/g;
const ACTIONS_CACHE_PATTERN = /uses:\s*['"]?actions\/cache@/m;
const ID_TOKEN_WRITE_PATTERN = /^\s*id-token:\s*write\b/m;
function getWorkflowFiles(workflowsDir) {
if (!fs.existsSync(workflowsDir)) {
return [];
@@ -100,6 +105,28 @@ function findViolations(filePath, source) {
}
}
if (WRITE_PERMISSION_PATTERN.test(source)) {
for (const match of source.matchAll(NPM_CI_PATTERN)) {
violations.push({
filePath,
event: 'write-permission install',
description: 'workflows with write permissions must install npm dependencies with --ignore-scripts',
expression: match[0],
line: getLineNumber(source, match.index),
});
}
}
if (ID_TOKEN_WRITE_PATTERN.test(source) && ACTIONS_CACHE_PATTERN.test(source)) {
violations.push({
filePath,
event: 'id-token cache',
description: 'workflows with id-token: write must not restore or save shared dependency caches',
expression: 'id-token: write + actions/cache',
line: getLineNumber(source, source.search(ID_TOKEN_WRITE_PATTERN)),
});
}
return violations;
}