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fix(lab): reject POSIX file URIs #243

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luvs01 wants to merge 1 commit into from
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fix(lab): reject POSIX file URIs #243

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2 changes: 2 additions & 0 deletions src/lab/events/limits.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ const FORBIDDEN_EXACT_KEYS = new Set([

const RAW_POSIX_PATH_RE =
/(?:^|[^A-Za-z0-9._~/])\/(?:(?=$|[^A-Za-z0-9._~/])|(?!\/)(?![ \t\r\n])(?:\/|[^/\0\r\n]+)+\/?(?=$|[^A-Za-z0-9._~/]))/u;
const FILE_POSIX_URI_RE = /\bfile:\/\/\//i;

@chatgpt-codex-connector chatgpt-codex-connector Bot Aug 11, 2026

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P2 Badge Recognize localhost authorities in file URIs

When an event contains a URI such as file://localhost/home/alice/secret.txt, this expression does not match because it requires the path's third slash immediately after file://, while RAW_POSIX_PATH_RE also skips the slashes following an authority. The URL API normalizes this standard local-file form to file:///home/alice/secret.txt, but enforceEventStructureLimits accepts it, so an unsanitized event can still persist the same sensitive local path through the ledger backstop. Match local file URIs with either an empty or localhost authority and add the authority form to the focused regression cases.

Useful? React with 👍 / 👎.


function fieldPath(base: string, key: string | number): string {
return base ? `${base}.${String(key)}` : String(key);
Expand Down Expand Up @@ -80,6 +81,7 @@ export function enforceEventStructureLimits(
}
if (
/^[A-Za-z]:\\/.test(value) ||
FILE_POSIX_URI_RE.test(value) ||
RAW_POSIX_PATH_RE.test(value) ||
value.includes("\\Users\\")
) {
Expand Down
2 changes: 2 additions & 0 deletions tests/lab-post-merge-hardening.test.ts
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Expand Up @@ -191,6 +191,8 @@ test("event privacy admission rejects raw POSIX path bypass forms", () => {
"cwd=/home/@alice",
"cwd=/home/josé/work",
"x-/home/alice",
"detail=file:///etc/passwd",
"detail=file:///home/alice/secret.txt",
]) {
try {
enforceEventStructureLimits({ detail });
Expand Down
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