The Node.Probe and Remote.do paths built outbound URLs by string-
formatting admin-controlled fields (Scheme/Address/Port/BasePath)
straight into requests, then dialed the result with the default
transport. CodeQL flagged this as go/request-forgery — an admin
(or anyone who compromises the admin account) could point a node
at internal infrastructure (cloud metadata, RFC1918 ranges, etc.)
and the panel would dutifully fetch it.
Add util/netsafe with a shared TOCTOU-safe DialContext that
resolves the host, rejects private/internal IPs unless the
per-request context whitelists them (per-node AllowPrivateAddress
flag, plumbed through context.Value), and dials the resolved IP
directly so the IP that passed the check is the IP we connect to.
This closes the DNS-rebinding window where a hostname could
resolve to a public IP at check time and a private one at dial.
Also tighten address validation (NormalizeHost rejects anything
that isn't a bare hostname or IP literal — no embedded paths,
userinfo, schemes) and switch URL construction from fmt.Sprintf to
url.URL{} + net.JoinHostPort so admin-supplied values can't smuggle
URL components.
custom_geo.go's isBlockedIP now delegates to netsafe so there's
one source of truth.
* Add SSRF protection for custom geo downloads
Introduce SSRF-safe HTTP transport for custom geo operations by adding ssrfSafeTransport and isBlockedIP helpers. The transport resolves hosts and blocks loopback, private, link-local and unspecified addresses, returning ErrCustomGeoSSRFBlocked on violations. Update probeCustomGeoURLWithGET, probeCustomGeoURL and downloadToPathOnce to use the safe transport. Also add the new error ErrCustomGeoSSRFBlocked and necessary imports. Minor whitespace/formatting adjustments in subClashService.go, web/entity/entity.go and web/service/setting.go.
* Add path traversal protection for custom geo
Prevent path traversal when handling custom geo downloads by adding ErrCustomGeoPathTraversal and a validateDestPath() helper that ensures destination paths stay inside the bin folder. Call validateDestPath from downloadToPathOnce, Update and Delete paths and wrap errors appropriately. Reconstruct sanitized URLs in sanitizeURL to break taint propagation before use. Map the new path-traversal error to a user-facing i18n message in the controller.
* fix
