Modernize sample keys and sample configs

I kept most of the certificate properties equal to the old
certs, since some people's test scripts might rely on them (and
it does not require any creativity from my part).

Changes:
 * Add script to generate fresh test/sample keys
   (but keep sample keys in git for simple testing)
 * Switch from 1024 to 4096 bits RSA CA
 * Switch from 1024 to 2048 bits client/server RSA keys
 * Switch from 1024 to 2048 bits Diffie-Hellman parameters
 * Generate EC client and server cert, but sign with RSA CA
   (lets us test EC <-> RSA interoperability)
 * Remove 3DES cipher from 'sample' config
 * Add 'remote-cert-tls server' to client config
 * Update config files to deprecate nsCertType in favour of the
   keyUsage and extendedKeyUsage extensions.
 * Make naming more consistent

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Samuli Seppänen <samuli@openvpn.net>
Message-Id: <CAA1AbxKZr_E6Wk9GBbB3xpLyJzyBxSa1k21UDXnC90d8refUzw@mail.gmail.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9226
Signed-off-by: Gert Doering <gert@greenie.muc.de>

5 files changed, 14 insertions, 16 deletions

diff --git a/sample/sample-config-files/client.conf b/sample/sample-config-files/client.conf
index 58b2038..050ef60 100644
--- a/sample/sample-config-files/client.conf
+++ b/sample/sample-config-files/client.conf
@@ -89,18 +89,19 @@ ca ca.crt
 cert client.crt
 key client.key
 
-# Verify server certificate by checking
-# that the certicate has the nsCertType
-# field set to "server".  This is an
-# important precaution to protect against
+# Verify server certificate by checking that the
+# certicate has the correct key usage set.
+# This is an important precaution to protect against
 # a potential attack discussed here:
 #  http://openvpn.net/howto.html#mitm
 #
 # To use this feature, you will need to generate
-# your server certificates with the nsCertType
-# field set to "server".  The build-key-server
-# script in the easy-rsa folder will do this.
-ns-cert-type server
+# your server certificates with the keyUsage set to
+#   digitalSignature, keyEncipherment
+# and the extendedKeyUsage to
+#   serverAuth
+# EasyRSA can do this for you.
+remote-cert-tls server
 
 # If a tls-auth key is used on the server
 # then every client must also have the key.
diff --git a/sample/sample-config-files/loopback-client b/sample/sample-config-files/loopback-client
index d7f59e6..ebbd1cf 100644
--- a/sample/sample-config-files/loopback-client
+++ b/sample/sample-config-files/loopback-client
@@ -17,9 +17,9 @@ dev null
 verb 3
 reneg-sec 10
 tls-client
+remote-cert-tls server
 ca sample-keys/ca.crt
 key sample-keys/client.key
 cert sample-keys/client.crt
-cipher DES-EDE3-CBC
 ping 1
 inactive 120 10000000
diff --git a/sample/sample-config-files/loopback-server b/sample/sample-config-files/loopback-server
index 9d21bce..8cb97be 100644
--- a/sample/sample-config-files/loopback-server
+++ b/sample/sample-config-files/loopback-server
@@ -17,10 +17,9 @@ dev null
 verb 3
 reneg-sec 10
 tls-server
-dh sample-keys/dh1024.pem
+dh sample-keys/dh2048.pem
 ca sample-keys/ca.crt
 key sample-keys/server.key
 cert sample-keys/server.crt
-cipher DES-EDE3-CBC
 ping 1
 inactive 120 10000000
diff --git a/sample/sample-config-files/server.conf b/sample/sample-config-files/server.conf
index 467d5b8..701be3c 100644
--- a/sample/sample-config-files/server.conf
+++ b/sample/sample-config-files/server.conf
@@ -81,10 +81,8 @@ key server.key  # This file should be kept secret
 
 # Diffie hellman parameters.
 # Generate your own with:
-#   openssl dhparam -out dh1024.pem 1024
-# Substitute 2048 for 1024 if you are using
-# 2048 bit keys.
-dh dh1024.pem
+#   openssl dhparam -out dh2048.pem 2048
+dh dh2048.pem
 
 # Network topology
 # Should be subnet (addressing via IP)
diff --git a/sample/sample-config-files/tls-office.conf b/sample/sample-config-files/tls-office.conf
index f790f46..d196144 100644
--- a/sample/sample-config-files/tls-office.conf
+++ b/sample/sample-config-files/tls-office.conf
@@ -26,7 +26,7 @@ up ./office.up
 tls-server
 
 # Diffie-Hellman Parameters (tls-server only)
-dh dh1024.pem
+dh dh2048.pem
 
 # Certificate Authority file
 ca my-ca.crt