# TLS server: general ops and certificate extractions
gnutls
+#
+# Very early (unsure when) GnuTLS prefers RSA auth by default. Later, but before 3.6.x, prefers
+# ECDSA but the client can be given a priority order to override that. We're running the server
+# with no priority string given (tls_require_ciphers) hence default, and with both types of
+# server cert loaded (RSA first, though we don't document that as relevant and in testing it
+# does not appear to matter).
+#
+# GnuTLS 3.6.5 appears to ignore the client priority ordering, always choosing ECDSA if both
+# are permitted, if TLS1.3 is permitted, so we limit to TLS1.2.
+#
exim -DSERVER=server -bd -oX PORT_D
****
-# Have the client prefer RSA (but support ECDSA as well). That should get us RSA on both older and newer GnuTLS.
-client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS-ALL:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
+# Have the client do RSA (but support ECDSA as well). That should get us RSA on both older and newer GnuTLS.
+client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS1.2:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
??? 220
ehlo rhu.barb
??? 250-
quit
??? 221
****
-client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS-ALL:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
+client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS1.2:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
??? 220
ehlo rhu.barb
??? 250-
quit
??? 221
****
-client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS-ALL:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 HOSTIPV4 PORT_D
+#
+# Server asks for a client cert but client does not supply one
+client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS1.2:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 HOSTIPV4 PORT_D
??? 220
ehlo rhu.barb
??? 250-
-??? 250-
-??? 250-
-??? 250-
-??? 250-
-??? 250
+??? 250-SIZE
+??? 250-8BITMIME
+??? 250-PIPELINING
+??? 250-STARTTLS
+??? 250 HELP
starttls
-??? 220
+??? 220 TLS go ahead
+nop
+???*
+****
+# ensure sequence of log TLS error line
+killdaemon
+sleep 1
+exim -DSERVER=server -bd -oX PORT_D
****
-client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS-ALL:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 HOSTIPV4 PORT_D DIR/aux-fixed/exim-ca/example.com/server2.example.com/server2.example.com.pem DIR/aux-fixed/exim-ca/example.com/server2.example.com/server2.example.com.unlocked.key
+#
+#
+# Server asks for a client cert, and one is given which is verifiable by the server
+client-gnutls -p NONE:+SIGN-RSA-SHA256:+SIGN-ECDSA-SHA512:+VERS-TLS1.2:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 HOSTIPV4 PORT_D DIR/aux-fixed/exim-ca/example.com/server2.example.com/server2.example.com.pem DIR/aux-fixed/exim-ca/example.com/server2.example.com/server2.example.com.unlocked.key
??? 220
ehlo rhu.barb
??? 250-
# We have to specify the key-exchange as well as the authentication, otherwise,
# the GnuTLS server side being foolish - it picks an ECDSA cipher-suite and then can't use it :(
# Possibly fixed in 3.6.x ?
-client-gnutls -p NONE:+SIGN-RSA-SHA256:+VERS-TLS-ALL:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
+client-gnutls -p NONE:+SIGN-RSA-SHA256:+VERS-TLS1.2:+ECDHE-RSA:+DHE-RSA:+RSA:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
??? 220
ehlo rhu.barb
??? 250-
#
#
# Make ECDSA authentication preferred (Older GnuTLS prefers RSA, it seems, Newer, ECDSA).
-client-gnutls -p NONE:+SIGN-ECDSA-SHA512:+VERS-TLS-ALL:+KX-ALL:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
+client-gnutls -p NONE:+SIGN-ECDSA-SHA512:+VERS-TLS1.2:+KX-ALL:+CIPHER-ALL:+MAC-ALL:+COMP-NULL:+CURVE-ALL:+CTYPE-X509 127.0.0.1 PORT_D
??? 220
ehlo rhu.barb
??? 250-
??? 221
****
killdaemon
+sleep 1
+# clear out the queue
exim -qf
****
+sleep 1
+#
+# STARTTLS used when not advertised
exim -bh 10.0.0.1
starttls
quit