RFC: etcdmain, pkg: CN based auth for inter peer connection

Documentation/op-guide/configuration.md

@@ -251,6 +251,11 @@ The security flags help to [build a secure etcd cluster][security].
 + default: false
 + env variable: ETCD_PEER_AUTO_TLS
 
+### --peer-cert-allowed-cn
++ Allowed CommonName for inter peer authentication.
++ default: none
++ env variable: ETCD_PEER_CERT_ALLOWED_CN
+
 ## Logging flags
 
 ### --debug

e2e/etcd_config_test.go

@@ -113,3 +113,80 @@ func TestEtcdUnixPeers(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+// TestEtcdPeerCNAuth checks that the inter peer auth based on CN of cert is working correctly.
+func TestEtcdPeerCNAuth(t *testing.T) {
+	peers, tmpdirs := make([]string, 3), make([]string, 3)
+	for i := range peers {
+		peers[i] = fmt.Sprintf("e%d=https://127.0.0.1:%d", i, etcdProcessBasePort+i)
+		d, err := ioutil.TempDir("", fmt.Sprintf("e%d.etcd", i))
+		if err != nil {
+			t.Fatal(err)
+		}
+		tmpdirs[i] = d
+	}
+	ic := strings.Join(peers, ",")
+
+	procs := make([]*expect.ExpectProcess, len(peers))
+	defer func() {
+		for i := range procs {
+			if procs[i] != nil {
+				procs[i].Stop()
+			}
+			os.RemoveAll(tmpdirs[i])
+		}
+	}()
+
+	// node 0 and 1 have a cert with the correct CN, node 2 doesn't
+	for i := range procs {
+		commonArgs := []string{
+			binDir + "/etcd",
+			"--name", fmt.Sprintf("e%d", i),
+			"--listen-client-urls", "http://0.0.0.0:0",
+			"--data-dir", tmpdirs[i],
+			"--advertise-client-urls", "http://0.0.0.0:0",
+			"--listen-peer-urls", fmt.Sprintf("https://127.0.0.1:%d,https://127.0.0.1:%d", etcdProcessBasePort+i, etcdProcessBasePort+len(peers)+i),
+			"--initial-advertise-peer-urls", fmt.Sprintf("https://127.0.0.1:%d", etcdProcessBasePort+i),
+			"--initial-cluster", ic,
+		}
+
+		var args []string
+		if i <= 1 {
+			args = []string{
+				"--peer-cert-file", certPath,
+				"--peer-key-file", privateKeyPath,
+				"--peer-trusted-ca-file", caPath,
+				"--peer-client-cert-auth",
+				"--peer-cert-allowed-cn", "example.com",
+			}
+		} else {
+			args = []string{
+				"--peer-cert-file", certPath2,
+				"--peer-key-file", privateKeyPath2,
+				"--peer-trusted-ca-file", caPath,
+				"--peer-client-cert-auth",
+				"--peer-cert-allowed-cn", "example2.com",
+			}
+		}
+
+		commonArgs = append(commonArgs, args...)
+
+		p, err := spawnCmd(commonArgs)
+		if err != nil {
+			t.Fatal(err)
+		}
+		procs[i] = p
+	}
+
+	for i, p := range procs {
+		var expect []string
+		if i <= 1 {
+			expect = etcdServerReadyLines
+		} else {
+			expect = []string{"(remote error: tls: bad certificate)"}
+		}
+		if err := waitReadyExpectProc(p, expect); err != nil {
+			t.Fatal(err)
+		}
+	}
+}

e2e/main_test.go

@@ -21,6 +21,9 @@ var (
 	privateKeyPath string
 	caPath         string
 
+	certPath2       string
+	privateKeyPath2 string
+
 	crlPath               string
 	revokedCertPath       string
 	revokedPrivateKeyPath string
@@ -43,6 +46,9 @@ func TestMain(m *testing.M) {
 	revokedPrivateKeyPath = certDir + "/server-revoked.key.insecure"
 	crlPath = certDir + "/revoke.crl"
 
+	certPath2 = certDir + "/server2.crt"
+	privateKeyPath2 = certDir + "/server2.key.insecure"
+
 	v := m.Run()
 	if v == 0 && testutil.CheckLeakedGoroutine() {
 		os.Exit(1)

etcdmain/config.go

@@ -184,6 +184,7 @@ func newConfig() *config {
 	fs.StringVar(&cfg.PeerTLSInfo.TrustedCAFile, "peer-trusted-ca-file", "", "Path to the peer server TLS trusted CA file.")
 	fs.BoolVar(&cfg.PeerAutoTLS, "peer-auto-tls", false, "Peer TLS using generated certificates")
 	fs.StringVar(&cfg.PeerTLSInfo.CRLFile, "peer-crl-file", "", "Path to the peer certificate revocation list file.")
+	fs.StringVar(&cfg.PeerTLSInfo.AllowedCN, "peer-cert-allowed-cn", "", "Allowed CN for inter peer authentication.")
 
 	// logging
 	fs.BoolVar(&cfg.Debug, "debug", false, "Enable debug-level logging for etcd.")

integration/fixtures/ca.crt

@@ -1,22 +1,22 @@
 -----BEGIN CERTIFICATE-----
-MIIDrjCCApagAwIBAgIUaE5uhZZO0NApCR9JZ8WFTYzCRHEwDQYJKoZIhvcNAQEL
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 -----END CERTIFICATE-----

integration/fixtures/gencerts.sh

@@ -23,6 +23,15 @@ cfssl gencert \
 mv server.pem server.crt
 mv server-key.pem server.key.insecure
 
+# generate DNS: localhost, IP: 127.0.0.1, CN: example2.com certificates
+cfssl gencert \
+    --ca ./ca.crt \
+    --ca-key ./ca-key.pem \
+    --config ./gencert.json \
+    ./server-ca-csr2.json | cfssljson --bare ./server2
+mv server2.pem server2.crt
+mv server2-key.pem server2.key.insecure
+
 # generate revoked certificates and crl
 cfssl gencert --ca ./ca.crt \
     --ca-key ./ca-key.pem \

integration/fixtures/server-ca-csr2.json

@@ -0,0 +1,20 @@
+{
+  "key": {
+    "algo": "rsa",
+    "size": 2048
+  },
+  "names": [
+    {
+      "O": "etcd",
+      "OU": "etcd Security",
+      "L": "San Francisco",
+      "ST": "California",
+      "C": "USA"
+    }
+  ],
+  "CN": "example2.com",
+  "hosts": [
+    "127.0.0.1",
+    "localhost"
+  ]
+}

integration/fixtures/server-revoked.crt

@@ -1,24 +1,24 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

integration/fixtures/server-revoked.key.insecure

@@ -1,27 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
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 -----END RSA PRIVATE KEY-----

integration/fixtures/server-wildcard.crt

@@ -1,24 +1,24 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

integration/fixtures/server-wildcard.key.insecure

@@ -1,27 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
-MIIEpQIBAAKCAQEA332cNiZkreCFjeBM9Hjkz54hhCceru5g6QZdpMM326b2uIo8
-9SO7UDYdgxmY7rbQJFrQjkZUPqDtIEDWix706D2aCynrIZ26SNUWGM8Ep775B8y2
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+VaPxzmsk0iElzD+fTYTaEEpUgBebV1Hr+lX6MFK8euSUYQKxkfg=
 -----END RSA PRIVATE KEY-----