Am 06.12.21 um 15:56 schrieb Arne Schwabe:
This allows to use the same configuration multiple platforms/ssl libraries
and include optional algorithms that are not available on all platforms

For example "AES-256-GCM:AES-128-GCM:?CHACHA20-POLY1305" can be used to
emulate the default behaviour of OpenVPN 2.6.

Patch v2: fix error_found reset by optional cipher, fix typo in Changes.rst
Patch v3: remove part of other patch accidently included

Signed-off-by: Arne Schwabe <a...@rfc2549.org>
---
  src/openvpn/ssl_ncp.c               | 4 ++--
  tests/unit_tests/openvpn/test_ncp.c | 3 +++
  2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/openvpn/ssl_ncp.c b/src/openvpn/ssl_ncp.c
index 7ad825038..7f5e6fe8b 100644
--- a/src/openvpn/ssl_ncp.c
+++ b/src/openvpn/ssl_ncp.c
@@ -134,7 +134,7 @@ mutate_ncp_cipher_list(const char *list, struct gc_arena 
*gc)
          {
              const char* optstr = optional ? "optional ": "";
              msg(M_WARN, "Unsupported %scipher in --data-ciphers: %s", optstr, 
token);
-            error_found = !optional;
+            error_found = error_found || !optional;
          }
          else
          {
@@ -489,4 +489,4 @@ p2p_mode_ncp(struct tls_multi *multi, struct tls_session 
*session)
          multi->use_peer_id, multi->peer_id, common_cipher);
gc_free(&gc);
-}
\ No newline at end of file
+}
diff --git a/tests/unit_tests/openvpn/test_ncp.c 
b/tests/unit_tests/openvpn/test_ncp.c
index faf09a36c..6702133ad 100644
--- a/tests/unit_tests/openvpn/test_ncp.c
+++ b/tests/unit_tests/openvpn/test_ncp.c
@@ -95,6 +95,9 @@ test_check_ncp_ciphers_list(void **state)
      /* All unsupported should still yield an empty list */
      assert_ptr_equal(mutate_ncp_cipher_list("?kugelfisch:?grasshopper", &gc), 
NULL);
+ /* If the last is optional, previous invalid ciphers should be ignored */
+    
assert_ptr_equal(mutate_ncp_cipher_list("Vollbit:Littlebit:AES-256-CBC:BF-CBC:?nixbit",
 &gc), NULL);
+
      /* For testing that with OpenSSL 1.1.0+ that also accepts ciphers in
       * a different spelling the normalised cipher output is the same */
      bool have_chacha_mixed_case = cipher_kt_get("ChaCha20-Poly1305");


Disregard this. I did not realise the original version of the patch had been already pushed to master. I will amend the commmit to make this is a follow up patch.

Arne


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