[Openvpn-devel] [PATCH v2 16/20] Add message when decoding PKCS12 file fails.

[Arne S. <ar...@rf...>]

Currently we never display the OpenSSL error stack when decoding a
PCKS12 file fails. With LibreSSL defaulting to RC2-40-CBC, the failure
might not be a wrong password but can actually be an unsupported
encoding, seeing the error stack is really helpful (example from OpenSSL 3.0):

error:0308010C:digital envelope routines:inner_evp_generic_fetch:unsupported:crypto/evp/evp_fetch.c:346:Global  default library context, Algorithm (RC2-40-CBC : 0), Properties ()

to pinpoint the issue

Signed-off-by: Arne Schwabe <ar...@rf...>
---
 src/openvpn/ssl_openssl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/openvpn/ssl_openssl.c b/src/openvpn/ssl_openssl.c
index 8ec96e66c..d93292700 100644
--- a/src/openvpn/ssl_openssl.c
+++ b/src/openvpn/ssl_openssl.c
@@ -831,6 +831,8 @@ tls_ctx_load_pkcs12(struct tls_root_ctx *ctx, const char *pkcs12_file,
         ca = NULL;
         if (!PKCS12_parse(p12, password, &pkey, &cert, &ca))
         {
+            crypto_msg(M_WARN, "Decoding PKCS12 failed. Probably wrong password "
+                               "or unsupported/legacy encryption");
 #ifdef ENABLE_MANAGEMENT
             if (management && (ERR_GET_REASON(ERR_peek_error()) == PKCS12_R_MAC_VERIFY_FAILURE))
             {
-- 
2.33.0