support common name check for tls (#934)

cmd/drainer/drainer.toml

@@ -118,6 +118,8 @@ port = 3306
 # ssl-cert = "/path/to/drainer.pem"
 # Path of file that contains X509 key in PEM format.
 # ssl-key = "/path/to/drainer-key.pem"
+# The common name which is allowed to connection with cluster components.
+# cert-allowed-cn = ["binlog"]
 
 [syncer.to.checkpoint]
 # only support mysql or tidb now, you can uncomment this to control where the checkpoint is saved.

cmd/pump/pump.toml

@@ -26,6 +26,8 @@ pd-urls = "http://127.0.0.1:2379"
 # ssl-cert = "/path/to/drainer.pem"
 # Path of file that contains X509 key in PEM format for connection with cluster components.
 # ssl-key = "/path/to/drainer-key.pem"
+# The common name which is allowed to connection with cluster components.
+# cert-allowed-cn = ["binlog"]
 #
 # [storage]
 # Set to `true` (default) for best reliability, which prevents data loss when there is a power failure.

pkg/security/security.go

@@ -17,16 +17,18 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"io/ioutil"
+	"strings"
 
 	"github.com/pingcap/errors"
 	"github.com/pingcap/tidb/config"
 )
 
 // Config is security config
 type Config struct {
-	SSLCA   string `toml:"ssl-ca" json:"ssl-ca"`
-	SSLCert string `toml:"ssl-cert" json:"ssl-cert"`
-	SSLKey  string `toml:"ssl-key" json:"ssl-key"`
+	SSLCA         string   `toml:"ssl-ca" json:"ssl-ca"`
+	SSLCert       string   `toml:"ssl-cert" json:"ssl-cert"`
+	SSLKey        string   `toml:"ssl-key" json:"ssl-key"`
+	CertAllowedCN []string `toml:"cert-allowed-cn" json:"cert-allowed-cn"`
 }
 
 // ToTLSConfig generates tls's config based on security section of the config.
@@ -49,7 +51,8 @@ func (c *Config) ToTLSConfig() (tlsConfig *tls.Config, err error) {
 	}
 
 	tlsConfig = &tls.Config{
-		RootCAs: certPool,
+		RootCAs:   certPool,
+		ClientCAs: certPool,
 	}
 
 	if len(c.SSLCert) != 0 && len(c.SSLKey) != 0 {
@@ -75,6 +78,29 @@ func (c *Config) ToTLSConfig() (tlsConfig *tls.Config, err error) {
 		}
 	}
 
+	if len(c.CertAllowedCN) != 0 {
+		checkCN := make(map[string]struct{})
+		for _, cn := range c.CertAllowedCN {
+			cn = strings.TrimSpace(cn)
+			checkCN[cn] = struct{}{}
+		}
+
+		tlsConfig.ClientAuth = tls.RequireAndVerifyClientCert
+
+		tlsConfig.VerifyPeerCertificate = func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+			cns := make([]string, 0, len(verifiedChains))
+			for _, chains := range verifiedChains {
+				for _, chain := range chains {
+					cns = append(cns, chain.Subject.CommonName)
+					if _, match := checkCN[chain.Subject.CommonName]; match {
+						return nil
+					}
+				}
+			}
+			return errors.Errorf("client certificate authentication failed. The Common Name from the client certificate %v was not found in the configuration cluster-verify-cn with value: %s", cns, c.CertAllowedCN)
+		}
+	}
+
 	return
 }
 

tests/_utils/run_drainer

@@ -32,6 +32,8 @@ fi
 ssl-ca = "$OUT_DIR/cert/ca.pem"
 ssl-cert = "$OUT_DIR/cert/drainer.pem"
 ssl-key = "$OUT_DIR/cert/drainer.key"
+cert-allowed-cn = ["binlog"]
+
 EOF
 
     drainer -log-file $OUT_DIR/drainer.log -config "$OUT_DIR/drainer-config-tmp.toml" -pd-urls https://127.0.0.1:2379 -addr 0.0.0.0:8249 -advertise-addr 127.0.0.1:8249 -node-id drainer-id $* >> $OUT_DIR/drainer.log 2>&1

tests/_utils/run_pump

@@ -29,6 +29,7 @@ cat - > "$OUT_DIR/pump-config.toml" <<EOF
 ssl-ca = "$OUT_DIR/cert/ca.pem"
 ssl-cert = "$OUT_DIR/cert/pump.pem"
 ssl-key = "$OUT_DIR/cert/pump.key"
+cert-allowed-cn = ["binlog"]
 EOF
 
 BINLOG_TEST=1 pump -log-file $OUT_DIR/pump_$PORT.log --addr=0.0.0.0:$PORT \

tests/run.sh

@@ -34,12 +34,12 @@ DNS.1 = localhost
 IP.1 = 127.0.0.1
 EOF
     openssl ecparam -out "$TT/ca.key" -name prime256v1 -genkey
-    openssl req -new -batch -sha256 -subj '/CN=localhost' -key "$TT/ca.key" -out "$TT/ca.csr"
+    openssl req -new -batch -sha256 -subj '/CN=binlog' -key "$TT/ca.key" -out "$TT/ca.csr"
     openssl x509 -req -sha256 -days 2 -in "$TT/ca.csr" -signkey "$TT/ca.key" -out "$TT/ca.pem" 2> /dev/null
 
     for name in tidb pd tikv pump drainer client; do
         openssl ecparam -out "$TT/$name.key" -name prime256v1 -genkey
-        openssl req -new -batch -sha256 -subj '/CN=localhost' -key "$TT/$name.key" -out "$TT/$name.csr"
+        openssl req -new -batch -sha256 -subj '/CN=binlog' -key "$TT/$name.key" -out "$TT/$name.csr"
         openssl x509 -req -sha256 -days 1 -extensions EXT -extfile "$TT/ipsan.cnf" -in "$TT/$name.csr" -CA "$TT/ca.pem" -CAkey "$TT/ca.key" -CAcreateserial -out "$TT/$name.pem" 2> /dev/null
     done
 }