tests: add integration test for DERP verify endpoint

.github/workflows/test-integration.yaml

@@ -37,6 +37,7 @@ jobs:
           - TestNodeRenameCommand
           - TestNodeMoveCommand
           - TestPolicyCommand
+          - TestDERPVerifyEndpoint
           - TestDERPServerScenario
           - TestPingAllByIP
           - TestPingAllByIPPublicDERP

Dockerfile.derper

@@ -0,0 +1,19 @@
+# For testing purposes only
+
+FROM golang:1.22-alpine AS build-env
+
+WORKDIR /go/src
+
+RUN apk add --no-cache git
+ARG VERSION_BRANCH=main
+RUN git clone https://github.com/tailscale/tailscale.git --branch=$VERSION_BRANCH --depth=1
+WORKDIR /go/src/tailscale
+
+ARG TARGETARCH
+RUN GOARCH=$TARGETARCH go install -v ./cmd/derper
+
+FROM alpine:3.18
+RUN apk add --no-cache ca-certificates iptables iproute2 ip6tables curl
+
+COPY --from=build-env /go/bin/* /usr/local/bin/
+ENTRYPOINT [ "/usr/local/bin/derper" ]

integration/derp_verify_endpoint_test.go

@@ -0,0 +1,111 @@
+package integration
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/util"
+	"github.com/juanfont/headscale/integration/dsic"
+	"github.com/juanfont/headscale/integration/hsic"
+	"github.com/juanfont/headscale/integration/integrationutil"
+	"github.com/juanfont/headscale/integration/tsic"
+)
+
+func TestDERPVerifyEndpoint(t *testing.T) {
+	IntegrationSkip(t)
+
+	// Generate random hostname for the headscale instance
+	hash, err := util.GenerateRandomStringDNSSafe(6)
+	assertNoErr(t, err)
+	testName := "derpverify"
+	hostname := fmt.Sprintf("hs-%s-%s", testName, hash)
+
+	headscalePort := 8080
+
+	// Create cert for headscale
+	certHeadscale, keyHeadscale, err := integrationutil.CreateCertificate(hostname)
+	assertNoErr(t, err)
+
+	scenario, err := NewScenario(dockertestMaxWait())
+	assertNoErr(t, err)
+	defer scenario.Shutdown()
+
+	spec := map[string]int{
+		"user1": 10,
+	}
+
+	derper, err := scenario.CreateDERPServer("head",
+		dsic.WithCACert(certHeadscale),
+		dsic.WithVerifyClientURL(fmt.Sprintf("https://%s/verify", net.JoinHostPort(hostname, strconv.Itoa(headscalePort)))),
+	)
+	assertNoErr(t, err)
+
+	derpConfig := "regions:\n"
+	derpConfig += "  900:\n"
+	derpConfig += "    regionid: 900\n"
+	derpConfig += "    regioncode: test-derpverify\n"
+	derpConfig += "    regionname: TestDerpVerify\n"
+	derpConfig += "    nodes:\n"
+	derpConfig += "      - name: TestDerpVerify\n"
+	derpConfig += "        regionid: 900\n"
+	derpConfig += "        hostname: " + derper.GetHostname() + "\n"
+	derpConfig += "        stunport: " + derper.GetSTUNPort() + "\n"
+	derpConfig += "        stunonly: false\n"
+	derpConfig += "        derpport: " + derper.GetDERPPort() + "\n"
+
+	headscale, err := scenario.Headscale(
+		hsic.WithHostname(hostname),
+		hsic.WithPort(headscalePort),
+		hsic.WithCustomTLS(certHeadscale, keyHeadscale),
+		hsic.WithHostnameAsServerURL(),
+		hsic.WithCustomDERPServerOnly([]byte(derpConfig)),
+	)
+	assertNoErrHeadscaleEnv(t, err)
+
+	for userName, clientCount := range spec {
+		err = scenario.CreateUser(userName)
+		if err != nil {
+			t.Fatalf("failed to create user %s: %s", userName, err)
+		}
+
+		err = scenario.CreateTailscaleNodesInUser(userName, "all", clientCount, tsic.WithCACert(derper.GetCert()))
+		if err != nil {
+			t.Fatalf("failed to create tailscale nodes in user %s: %s", userName, err)
+		}
+
+		key, err := scenario.CreatePreAuthKey(userName, true, true)
+		if err != nil {
+			t.Fatalf("failed to create pre-auth key for user %s: %s", userName, err)
+		}
+
+		err = scenario.RunTailscaleUp(userName, headscale.GetEndpoint(), key.GetKey())
+		if err != nil {
+			t.Fatalf("failed to run tailscale up for user %s: %s", userName, err)
+		}
+	}
+
+	allClients, err := scenario.ListTailscaleClients()
+	assertNoErrListClients(t, err)
+
+	for _, client := range allClients {
+		report, err := client.DebugDERPRegion("test-derpverify")
+		assertNoErr(t, err)
+		successful := false
+		for _, line := range report.Info {
+			if strings.Contains(line, "Successfully established a DERP connection with node") {
+				successful = true
+
+				break
+			}
+		}
+		if !successful {
+			stJSON, err := json.Marshal(report)
+			assertNoErr(t, err)
+			t.Errorf("Client %s could not establish a DERP connection: %s", client.Hostname(), string(stJSON))
+		}
+	}
+}