Openssl 3.0.0

[Julien ÉLIE]

Hi all,

Seems like OpenSSL 3.0.0 has greatly improved its API!


> tls.c: In function 'load_dh_buffer':
> tls.c:167:9: warning: 'PEM_read_bio_DHparams' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
>    167 |         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
>        |         ^~

and

 > tls.c: In function 'tls_init_serverengine':
 > tls.c:571:5: warning: 'SSL_CTX_set_tmp_dh_callback' is deprecated: 
Since OpenSSL 3.0 [-Wdeprecated-declarations]
 >    571 |     SSL_CTX_set_tmp_dh_callback(CTX, tmp_dh_cb);
 >        |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~

"Applications may supply their own DH parameters instead of using the 
built-in values.  This approach is discouraged and applications should 
in preference use the built-in parameter support described above."

Seems like all we now need is:

SSL_CTX_set_dh_auto(CTX, 1);

And we can just keep the callback as well as hard-coded DH groups in 
tls.c only for previous versions of OpenSSL.



> tls.c: In function 'eckey_from_name':
> tls.c:473:5: warning: 'EC_KEY_new_by_curve_name' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
>    473 |     eckey = EC_KEY_new_by_curve_name(builtin_curves[i].nid);
>        |     ^~~~~

The whole eckey_from_name() function in tls.c now seems irrelevant.
If OpenSSL >= 3.0.0, it looks like

eckey = eckey_from_name(tls_ec_curve);

can just be changed to something like

eckey = EVP_PKEY_get1_EC_KEY(EVP_EC_gen(tls_ec_curve));


Not yet tested though.



> tls.c: In function 'tls_start_servertls':
> tls.c:852:9: warning: 'BIO_set_callback' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
>    852 |         BIO_set_callback(SSL_get_rbio(tls_conn), bio_dump_cb);
>        |         ^~~~~~~~~~~~~~~~
BIO_set_callback_ex() should now be used.
There are 2 more arguments to deal with in the callback function. 
Normally not difficult to take into account, I can have a look.

-- 
Julien ÉLIE

« Soldats, du haut de ces pyramides, vingt siècles nous contemplent. »
   (Napoléon)