Complement QoL changes (#2663)

This PR does the following:
- adds a `keysize` parameter to `generate-keys`, so we can use lower sized keys when running in CI
- updates the Complement docker files to use BuildKit (requires Docker >18.09)
- uses `exec` when executing `dendrite-monotlith-server`, making it PID 1 inside docker, which results in Dendrite actually receiving the `SIGTERM` signal send by Docker. (Making it faster when running tests with Complement, as we don't take 10 seconds to timeout)

2 files changed, 7 insertions, 7 deletions

diff --git a/test/http.go b/test/http.go
index 37b3648f..8cd83d0a 100644
--- a/test/http.go
+++ b/test/http.go
@@ -68,7 +68,7 @@ func ListenAndServe(t *testing.T, router http.Handler, withTLS bool) (apiURL str
 		if withTLS {
 			certFile := filepath.Join(t.TempDir(), "dendrite.cert")
 			keyFile := filepath.Join(t.TempDir(), "dendrite.key")
-			err = NewTLSKey(keyFile, certFile)
+			err = NewTLSKey(keyFile, certFile, 1024)
 			if err != nil {
 				t.Errorf("failed to make TLS key: %s", err)
 				return
diff --git a/test/keys.go b/test/keys.go
index 327c6ed7..fb156ef2 100644
--- a/test/keys.go
+++ b/test/keys.go
@@ -69,8 +69,8 @@ func NewMatrixKey(matrixKeyPath string) (err error) {
 
 const certificateDuration = time.Hour * 24 * 365 * 10
 
-func generateTLSTemplate(dnsNames []string) (*rsa.PrivateKey, *x509.Certificate, error) {
-	priv, err := rsa.GenerateKey(rand.Reader, 4096)
+func generateTLSTemplate(dnsNames []string, bitSize int) (*rsa.PrivateKey, *x509.Certificate, error) {
+	priv, err := rsa.GenerateKey(rand.Reader, bitSize)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -118,8 +118,8 @@ func writePrivateKey(tlsKeyPath string, priv *rsa.PrivateKey) error {
 }
 
 // NewTLSKey generates a new RSA TLS key and certificate and writes it to a file.
-func NewTLSKey(tlsKeyPath, tlsCertPath string) error {
-	priv, template, err := generateTLSTemplate(nil)
+func NewTLSKey(tlsKeyPath, tlsCertPath string, keySize int) error {
+	priv, template, err := generateTLSTemplate(nil, keySize)
 	if err != nil {
 		return err
 	}
@@ -136,8 +136,8 @@ func NewTLSKey(tlsKeyPath, tlsCertPath string) error {
 	return writePrivateKey(tlsKeyPath, priv)
 }
 
-func NewTLSKeyWithAuthority(serverName, tlsKeyPath, tlsCertPath, authorityKeyPath, authorityCertPath string) error {
-	priv, template, err := generateTLSTemplate([]string{serverName})
+func NewTLSKeyWithAuthority(serverName, tlsKeyPath, tlsCertPath, authorityKeyPath, authorityCertPath string, keySize int) error {
+	priv, template, err := generateTLSTemplate([]string{serverName}, keySize)
 	if err != nil {
 		return err
 	}