[Openvpn-devel,3/3] Add warning for the --show-groups command that some groups are missing

Message ID 20230701200840.3516314-3-arne@rfc2549.org
State New
Headers show
Series [Openvpn-devel,1/3] Print server temp key details | expand

Commit Message

Arne Schwabe July 1, 2023, 8:08 p.m. UTC
OpenSSL has a weird way of only reporting EC curves that are implemented
in a certain way in the list of all EC cruves. Note this fact and point
out that also the very important curves X448 and X25519 are affected.

Change-Id: I86641bf60d62a50e9b2719e809d2429d65c00097
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
 src/openvpn/ssl_openssl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)


diff --git a/src/openvpn/ssl_openssl.c b/src/openvpn/ssl_openssl.c
index 59bbdfc0a..442ae1871 100644
--- a/src/openvpn/ssl_openssl.c
+++ b/src/openvpn/ssl_openssl.c
@@ -2355,8 +2355,10 @@  show_available_tls_ciphers_list(const char *cipher_list,
-    printf("Consider using openssl 'ecparam -list_curves' as\n"
-           "alternative to running this command.\n");
+    printf("Consider using 'openssl ecparam -list_curves' as alternative to running\n"
+           "this command.\n"
+           "Note this output does only list curves/group that OpenSSL considers as\n"
+           "builtin EC curves. It does not list additional curves nor X448 or X25519\n");
 #ifndef OPENSSL_NO_EC
     EC_builtin_curve *curves = NULL;
     size_t crv_len = 0;