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package proxy_test
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/http/httptest"
"strings"
"testing"
"golang.org/x/net/http2"
"github.com/shiv/internal/store"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// h2UpstreamServer starts an HTTP/2-enabled TLS test server.
func h2UpstreamServer(t *testing.T, handler http.Handler) *httptest.Server {
t.Helper()
srv := httptest.NewUnstartedServer(handler)
srv.TLS = &tls.Config{
NextProtos: []string{"h2", "http/1.1"},
}
h2s := &http2.Server{}
require.NoError(t, http2.ConfigureServer(srv.Config, h2s))
srv.StartTLS()
t.Cleanup(srv.Close)
return srv
}
// h2ClientOverTunnel wraps a raw conn in a TLS client that negotiates HTTP/2
// and returns an *http.Client that routes all requests over that connection.
func h2ClientOverTunnel(t *testing.T, conn net.Conn, serverName string) *http.Client {
t.Helper()
tlsConn := tls.Client(conn, &tls.Config{
ServerName: serverName,
InsecureSkipVerify: true, //nolint:gosec — test only
NextProtos: []string{"h2"},
})
require.NoError(t, tlsConn.Handshake())
assert.Equal(t, "h2", tlsConn.ConnectionState().NegotiatedProtocol, "proxy must negotiate h2 with the client")
t.Cleanup(func() { tlsConn.Close() })
transport := &http2.Transport{
DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
return tlsConn, nil
},
TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, //nolint:gosec
}
return &http.Client{
Transport: transport,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
}
}
// ── tests ─────────────────────────────────────────────────────────────────────
func TestMITM_H2_ForwardsGET(t *testing.T) {
st := newTestStore(t)
upstream := h2UpstreamServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
io.WriteString(w, "h2 works")
}))
upstreamAddr := strings.TrimPrefix(upstream.URL, "https://")
host, port, err := net.SplitHostPort(upstreamAddr)
require.NoError(t, err)
targetHost := net.JoinHostPort(host, port)
proxyAddr := startProxyServer(t, st)
conn := doConnectTunnel(t, proxyAddr, targetHost)
client := h2ClientOverTunnel(t, conn, host)
resp, err := client.Get("https://" + targetHost + "/")
require.NoError(t, err)
defer resp.Body.Close()
assert.Equal(t, http.StatusOK, resp.StatusCode)
b, _ := io.ReadAll(resp.Body)
assert.Equal(t, "h2 works", string(b))
}
func TestMITM_H2_LogsTransaction(t *testing.T) {
st := newTestStore(t)
upstream := h2UpstreamServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
io.WriteString(w, "logged")
}))
upstreamAddr := strings.TrimPrefix(upstream.URL, "https://")
host, port, err := net.SplitHostPort(upstreamAddr)
require.NoError(t, err)
targetHost := net.JoinHostPort(host, port)
proxyAddr := startProxyServer(t, st)
conn := doConnectTunnel(t, proxyAddr, targetHost)
client := h2ClientOverTunnel(t, conn, host)
resp, err := client.Get("https://" + targetHost + "/log-test")
require.NoError(t, err)
resp.Body.Close()
tx := waitForTransaction(t, st)
assert.True(t, tx.TLS)
assert.Equal(t, "GET", tx.Method)
assert.Equal(t, http.StatusOK, tx.StatusCode)
}
func TestMITM_H2_PostWithBody(t *testing.T) {
st := newTestStore(t)
var receivedBody string
upstream := h2UpstreamServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
b, _ := io.ReadAll(r.Body)
receivedBody = string(b)
w.WriteHeader(http.StatusCreated)
}))
upstreamAddr := strings.TrimPrefix(upstream.URL, "https://")
host, port, err := net.SplitHostPort(upstreamAddr)
require.NoError(t, err)
targetHost := net.JoinHostPort(host, port)
proxyAddr := startProxyServer(t, st)
conn := doConnectTunnel(t, proxyAddr, targetHost)
client := h2ClientOverTunnel(t, conn, host)
body := `{"key":"value"}`
req, err := http.NewRequest(http.MethodPost, "https://"+targetHost+"/api", strings.NewReader(body))
require.NoError(t, err)
req.Header.Set("Content-Type", "application/json")
resp, err := client.Do(req)
require.NoError(t, err)
resp.Body.Close()
assert.Equal(t, http.StatusCreated, resp.StatusCode)
assert.Equal(t, body, receivedBody)
}
func TestMITM_H2_CacheHeadersStripped(t *testing.T) {
st := newTestStore(t)
upstream := h2UpstreamServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("ETag", `"abc"`)
w.Header().Set("Cache-Control", "max-age=3600")
w.WriteHeader(http.StatusOK)
}))
upstreamAddr := strings.TrimPrefix(upstream.URL, "https://")
host, port, err := net.SplitHostPort(upstreamAddr)
require.NoError(t, err)
targetHost := net.JoinHostPort(host, port)
proxyAddr := startProxyServer(t, st)
conn := doConnectTunnel(t, proxyAddr, targetHost)
client := h2ClientOverTunnel(t, conn, host)
resp, err := client.Get("https://" + targetHost + "/")
require.NoError(t, err)
resp.Body.Close()
assert.Empty(t, resp.Header.Get("ETag"))
assert.Equal(t, "no-store, no-cache, must-revalidate", resp.Header.Get("Cache-Control"))
}
func TestMITM_H2_InterceptDrop_Returns403(t *testing.T) {
st := newTestStore(t)
upstream := h2UpstreamServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "should not reach")
}))
upstreamAddr := strings.TrimPrefix(upstream.URL, "https://")
host, port, err := net.SplitHostPort(upstreamAddr)
require.NoError(t, err)
targetHost := net.JoinHostPort(host, port)
st.Intercept.SetEnabled(true)
go func() {
pending := <-st.Intercept.Queue()
pending.Reply <- store.Decision{Forward: false}
}()
proxyAddr := startProxyServer(t, st)
conn := doConnectTunnel(t, proxyAddr, targetHost)
client := h2ClientOverTunnel(t, conn, host)
resp, err := client.Get("https://" + targetHost + "/secret")
require.NoError(t, err)
resp.Body.Close()
assert.Equal(t, http.StatusForbidden, resp.StatusCode)
}
func TestMITM_H2_InterceptForward_ModifiesRequest(t *testing.T) {
st := newTestStore(t)
var receivedHeader string
upstream := h2UpstreamServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
receivedHeader = r.Header.Get("X-Injected")
w.WriteHeader(http.StatusOK)
}))
upstreamAddr := strings.TrimPrefix(upstream.URL, "https://")
host, port, err := net.SplitHostPort(upstreamAddr)
require.NoError(t, err)
targetHost := net.JoinHostPort(host, port)
st.Intercept.SetEnabled(true)
go func() {
pending := <-st.Intercept.Queue()
pending.Request.Header.Set("X-Injected", "h2-injected")
pending.Reply <- store.Decision{
Forward: true,
Request: pending.Request,
Body: pending.Body,
}
}()
proxyAddr := startProxyServer(t, st)
conn := doConnectTunnel(t, proxyAddr, targetHost)
client := h2ClientOverTunnel(t, conn, host)
resp, err := client.Get("https://" + targetHost + "/inject")
require.NoError(t, err)
resp.Body.Close()
assert.Equal(t, http.StatusOK, resp.StatusCode)
assert.Equal(t, "h2-injected", receivedHeader)
}
func TestMITM_H2_MultipleConcurrentStreams(t *testing.T) {
st := newTestStore(t)
upstream := h2UpstreamServer(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "path:%s", r.URL.Path)
}))
upstreamAddr := strings.TrimPrefix(upstream.URL, "https://")
host, port, err := net.SplitHostPort(upstreamAddr)
require.NoError(t, err)
targetHost := net.JoinHostPort(host, port)
proxyAddr := startProxyServer(t, st)
conn := doConnectTunnel(t, proxyAddr, targetHost)
client := h2ClientOverTunnel(t, conn, host)
results := make(chan string, 3)
for _, path := range []string{"/a", "/b", "/c"} {
p := path
go func() {
resp, err := client.Get("https://" + targetHost + p)
if err != nil {
results <- "error"
return
}
defer resp.Body.Close()
b, _ := io.ReadAll(resp.Body)
results <- string(b)
}()
}
got := make(map[string]bool)
for i := 0; i < 3; i++ {
got[<-results] = true
}
assert.True(t, got["path:/a"])
assert.True(t, got["path:/b"])
assert.True(t, got["path:/c"])
}
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