bas.sh
forked from
tangled.org/core
Monorepo for Tangled
appview/serververify: use SSRF-safe transport like repoverify
Signed-off-by: dawn <dawn@tangled.org>
author
dawn
date
(Jul 9, 2026, 5:39 PM +0300)
commit
564a54bb
564a54bb440da48d07733df4a7a9629ed57fb08f
parent
7f67a8bb
7f67a8bb98cf8b48a20f66d65e41396680c18ae3
change-id
omqluoso
omqluosowqqmlxxyqkywmmlqxulnptvy
+154
-2
+46
-2
appview/serververify/verify.go
+46
-2
appview/serververify/verify.go
···
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"context"
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"errors"
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"fmt"
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+
"net"
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+
"net/http"
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+
"syscall"
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"time"
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11
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indigoxrpc "github.com/bluesky-social/indigo/xrpc"
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"tangled.org/core/api/tangled"
···
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var (
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FetchError = errors.New("failed to fetch owner")
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)
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+
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const verifyTimeout = 10 * time.Second
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// fetchOwner fetches the owner DID from a server's /owner endpoint
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func fetchOwner(ctx context.Context, domain string, dev bool) (string, error) {
···
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}
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host := fmt.Sprintf("%s://%s", scheme, domain)
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transport := &http.Transport{
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DialContext: safeDialer(dev).DialContext,
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}
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xrpcc := &indigoxrpc.Client{
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Host: host,
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Client: &http.Client{
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Timeout: verifyTimeout,
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Transport: transport,
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},
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}
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res, err := tangled.Owner(ctx, xrpcc)
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-
if xrpcerr := xrpcclient.HandleXrpcErr(err); xrpcerr != nil {
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return "", xrpcerr
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if err != nil {
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var xrpcerr *indigoxrpc.Error
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if !errors.As(err, &xrpcerr) {
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return "", err
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}
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if handled := xrpcclient.HandleXrpcErr(err); handled != nil {
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return "", handled
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}
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}
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return res.Owner, nil
···
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return nil
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}
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func safeDialer(dev bool) *net.Dialer {
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d := &net.Dialer{
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Timeout: 5 * time.Second,
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KeepAlive: 30 * time.Second,
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}
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if dev {
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return d
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}
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d.Control = func(network, address string, _ syscall.RawConn) error {
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host, _, err := net.SplitHostPort(address)
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if err != nil {
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return fmt.Errorf("invalid dial address %q: %w", address, err)
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}
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ip := net.ParseIP(host)
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if ip == nil {
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return fmt.Errorf("dial address %q did not resolve to IP", address)
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}
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if ip.IsLoopback() || ip.IsPrivate() || ip.IsLinkLocalUnicast() ||
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ip.IsLinkLocalMulticast() || ip.IsMulticast() || ip.IsUnspecified() {
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return fmt.Errorf("refusing to dial %s: reserved or private address", ip)
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}
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return nil
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}
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return d
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}
+108
appview/serververify/verify_test.go
+108
appview/serververify/verify_test.go
···
1
+
package serververify
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+
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import (
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"context"
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"fmt"
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"net"
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"net/http"
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+
"net/http/httptest"
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"sync/atomic"
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"testing"
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"time"
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)
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+
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const ssrfExpectedOwner = "did:plc:ssrfguardexpectedowner"
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+
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func TestRunVerificationRejectsNonPublicDestinationsInProd(t *testing.T) {
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loopbackDomain, loopbackHits := localOwnerEndpoint(t, "127.0.0.1")
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+
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cases := []struct {
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name string
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domain string
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hits *atomic.Int32
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}{
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{
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name: "loopback address with a real owner endpoint",
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domain: loopbackDomain,
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hits: loopbackHits,
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},
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{
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name: "private address",
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domain: "10.0.0.1:80",
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},
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{
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name: "link-local metadata address",
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domain: "169.254.169.254:80",
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},
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{
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name: "reserved unspecified address",
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domain: "0.0.0.0:80",
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},
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}
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for _, tc := range cases {
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t.Run(tc.name, func(t *testing.T) {
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if tc.hits != nil {
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tc.hits.Store(0)
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}
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ctx, cancel := context.WithTimeout(context.Background(), 750*time.Millisecond)
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defer cancel()
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+
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started := time.Now()
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err := RunVerification(ctx, tc.domain, ssrfExpectedOwner, false)
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elapsed := time.Since(started)
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+
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if err == nil {
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t.Fatalf("RunVerification(%q, dev=false) succeeded; non-public destinations must be refused", tc.domain)
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}
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if elapsed > 250*time.Millisecond {
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t.Fatalf("RunVerification(%q, dev=false) took %s; want an immediate SSRF refusal, not network IO until timeout", tc.domain, elapsed)
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}
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if tc.hits != nil && tc.hits.Load() != 0 {
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t.Fatalf("RunVerification(%q, dev=false) reached the owner endpoint %d time(s); guard must refuse before normal network IO", tc.domain, tc.hits.Load())
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}
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})
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}
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}
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func TestRunVerificationAllowsNonPublicDestinationsInDev(t *testing.T) {
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loopbackDomain, loopbackHits := localOwnerEndpoint(t, "127.0.0.1")
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ctx, cancel := context.WithTimeout(context.Background(), 750*time.Millisecond)
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defer cancel()
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err := RunVerification(ctx, loopbackDomain, ssrfExpectedOwner, true)
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if err != nil {
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t.Fatalf("RunVerification(%q, dev=true) failed: %v", loopbackDomain, err)
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}
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if loopbackHits.Load() != 1 {
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t.Fatalf("RunVerification(%q, dev=true) did not reach owner endpoint", loopbackDomain)
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}
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}
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func localOwnerEndpoint(t *testing.T, host string) (string, *atomic.Int32) {
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t.Helper()
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ln, err := net.Listen("tcp", net.JoinHostPort(host, "0"))
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if err != nil {
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t.Fatalf("listen on %s: %v", host, err)
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}
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var hits atomic.Int32
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server := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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hits.Add(1)
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if r.URL.Path != "/xrpc/sh.tangled.owner" {
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http.NotFound(w, r)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintf(w, `{"owner":%q}`, ssrfExpectedOwner)
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}))
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server.Listener = ln
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server.Start()
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t.Cleanup(server.Close)
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return ln.Addr().String(), &hits
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+
}