From 34399332354b5cbc742200ef11aa33f199ba6755 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Wed, 29 May 2019 23:11:46 -0600
Subject: Implement session ticket keys; default STEK module with rotation

---
 modules/caddytls/values.go | 102 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 modules/caddytls/values.go

(limited to 'modules/caddytls/values.go')

diff --git a/modules/caddytls/values.go b/modules/caddytls/values.go
new file mode 100644
index 0000000..0559dc6
--- /dev/null
+++ b/modules/caddytls/values.go
@@ -0,0 +1,102 @@
+package caddytls
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+
+	"github.com/klauspost/cpuid"
+)
+
+// supportedCipherSuites is the unordered map of cipher suite
+// string names to their definition in crypto/tls.
+// TODO: might not be needed much longer, see:
+// https://github.com/golang/go/issues/30325
+var supportedCipherSuites = map[string]uint16{
+	"ECDHE_ECDSA_AES256_GCM_SHA384":      tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+	"ECDHE_RSA_AES256_GCM_SHA384":        tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+	"ECDHE_ECDSA_AES128_GCM_SHA256":      tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+	"ECDHE_RSA_AES128_GCM_SHA256":        tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+	"ECDHE_ECDSA_WITH_CHACHA20_POLY1305": tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
+	"ECDHE_RSA_WITH_CHACHA20_POLY1305":   tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+	"ECDHE_RSA_AES256_CBC_SHA":           tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
+	"ECDHE_RSA_AES128_CBC_SHA":           tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+	"ECDHE_ECDSA_AES256_CBC_SHA":         tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
+	"ECDHE_ECDSA_AES128_CBC_SHA":         tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+	"RSA_AES256_CBC_SHA":                 tls.TLS_RSA_WITH_AES_256_CBC_SHA,
+	"RSA_AES128_CBC_SHA":                 tls.TLS_RSA_WITH_AES_128_CBC_SHA,
+	"ECDHE_RSA_3DES_EDE_CBC_SHA":         tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
+	"RSA_3DES_EDE_CBC_SHA":               tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
+}
+
+// defaultCipherSuites is the ordered list of all the cipher
+// suites we want to support by default, assuming AES-NI
+// (hardware acceleration for AES).
+var defaultCipherSuitesWithAESNI = []uint16{
+	tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+	tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+	tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+	tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+	tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
+	tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+}
+
+// defaultCipherSuites is the ordered list of all the cipher
+// suites we want to support by default, assuming lack of
+// AES-NI (NO hardware acceleration for AES).
+var defaultCipherSuitesWithoutAESNI = []uint16{
+	tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
+	tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+	tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+	tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+	tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+	tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+}
+
+// getOptimalDefaultCipherSuites returns an appropriate cipher
+// suite to use depending on the hardware support for AES.
+//
+// See https://github.com/mholt/caddy/issues/1674
+func getOptimalDefaultCipherSuites() []uint16 {
+	if cpuid.CPU.AesNi() {
+		return defaultCipherSuitesWithAESNI
+	}
+	return defaultCipherSuitesWithoutAESNI
+}
+
+// supportedCurves is the unordered map of supported curves.
+// https://golang.org/pkg/crypto/tls/#CurveID
+var supportedCurves = map[string]tls.CurveID{
+	"X25519": tls.X25519,
+	"P256":   tls.CurveP256,
+	"P384":   tls.CurveP384,
+	"P521":   tls.CurveP521,
+}
+
+// defaultCurves is the list of only the curves we want to use
+// by default, in descending order of preference.
+//
+// This list should only include curves which are fast by design
+// (e.g. X25519) and those for which an optimized assembly
+// implementation exists (e.g. P256). The latter ones can be
+// found here:
+// https://github.com/golang/go/tree/master/src/crypto/elliptic
+var defaultCurves = []tls.CurveID{
+	tls.X25519,
+	tls.CurveP256,
+}
+
+// supportedProtocols is a map of supported protocols.
+// HTTP/2 only supports TLS 1.2 and higher.
+var supportedProtocols = map[string]uint16{
+	"tls1.0": tls.VersionTLS10,
+	"tls1.1": tls.VersionTLS11,
+	"tls1.2": tls.VersionTLS12,
+	"tls1.3": tls.VersionTLS13,
+}
+
+// publicKeyAlgorithms is the map of supported public key algorithms.
+var publicKeyAlgorithms = map[string]x509.PublicKeyAlgorithm{
+	"rsa":   x509.RSA,
+	"dsa":   x509.DSA,
+	"ecdsa": x509.ECDSA,
+}
-- 
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