Hi,

On 28/11/17 11:03, wizard2...@gmail.com wrote:
Hi there.

I guess my problem is really related to verify callback on SSL_CTX_set_verify 
function.
I just add to my code a dummy callback returning 1 and everything works 
properly.


    int verify_callback (int ok, X509_STORE_CTX *ctx);
    int verify_callback (int ok, X509_STORE_CTX *ctx)
    {
    printf("Verification callback OK!\n");
        return 1;
    }
    ...
    SSL_CTX_set_verify(ssl_server_ctx, SSL_VERIFY_PEER | 
SSL_VERIFY_FAIL_IF_NO_PEER_CERT, dtls_verify_callback);
    ...


The problem is that error don't tell much information about what's really going 
on or what's really missing.
Thanks for your help.

Now you've effectively disabled all security :)

Try adding this to the verify_callback


static int verify_callback(int ok, X509_STORE_CTX *ctx)
{
    X509           *cert = NULL;
    char           *cert_DN = NULL;

    printf("ok = %d\n", ok);
    cert    = X509_STORE_CTX_get_current_cert(ctx);
    cert_DN = X509_NAME_oneline( X509_get_subject_name( cert ), NULL, 0 );
    printf( "cert DN: %s\n", cert_DN);

}


that way, you will know whether your server is processing the right certificate 
chain.

HTH,

JJK

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