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fix(security): CORS allowlist, URL scheme guard, state perms, ZIP slip, mirror docs

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Phase 3 security audit follow-up. Medium and low-severity hardenings
plus a deferred-work plan for the cross-repo stream-token rollout.

Stream server CORS: replace the wildcard Access-Control-Allow-Origin
with an allowlist that echoes back only torrentclaw.com,
app.torrentclaw.com, the local Next dev port (3030 — matches the web
repo package.json) and any extras the operator adds via the new
downloads.cors_extra_origins TOML key. A Vary: Origin header is now
emitted whenever the request carries an Origin header so an
intermediate cache cannot serve a stale ACAO to a different origin.

URL scheme guard: openBrowser and OpenPlayer refuse any URL that is
not http(s). Combined with passing the URL after "--" wherever the
launched helper supports it (open, mpv, vlc, cvlc), this stops a
leading "-" from being parsed as a switch by the spawned process.

State file permissions: WriteState now writes 0o600 so the agent ID,
PID and counters cannot be enumerated by another local user on a
shared host. Matches the existing config file mode.

ZIP slip defense-in-depth: extractZip extracts the safety check into
safeZipPath, which canonicalises the entry name (normalising
backslashes to "/"), rejects "..", "../" prefix and "/../" interior
components, and verifies the final destination stays inside destDir
before opening any file.

Mirror fallback: documented the design for multi-provider
mirrors.json hosting in the comment block on DefaultStaticFallbackURLs
and added a follow-up note about signing it with the same ed25519
release key. The list is kept at one provider until the second host
is provisioned and added to torrentclaw-web's STATIC_FALLBACKS.

Deferred work: a new plan document Docs/plans/security-stream-token.md
covers the per-task stream token (Phase 2.2 of the original audit)
which requires coordinated web + CLI work and ships separately.
This commit is contained in:
Deivid Soto 2026-05-15 18:48:59 +02:00
parent 433e375def
commit 060a3e48db
13 changed files with 462 additions and 48 deletions
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26
internal/cmd/helpers_test.go
View file

@ -31,6 +31,32 @@ func TestExpandHome(t *testing.T) {
}
}
func TestIsSafeBrowserURL(t *testing.T) {
good := []string{
"http://localhost:3000",
"https://torrentclaw.com/some/path?q=1",
}
bad := []string{
"--help",
"-version",
"file:///etc/passwd",
"javascript:alert(1)",
"data:text/html,foo",
"ftp://example.com",
"",
}
for _, u := range good {
if !isSafeBrowserURL(u) {
t.Errorf("isSafeBrowserURL(%q) = false, want true", u)
}
}
for _, u := range bad {
if isSafeBrowserURL(u) {
t.Errorf("isSafeBrowserURL(%q) = true, want false", u)
}
}
}
func TestDefaultDownloadDir(t *testing.T) {
dir := defaultDownloadDir()
if dir == "" {