tests: Enable RSA SHA1 certs for testing against older OpenSSH

The OpenSSH 7.4 or 7.6 in Ubuntu and CentOS 7 does not support SHA2
RSA certificates and libssh automatically falls back to SHA1, which
is not allowed by default.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

tests/client/torture_auth.c

@@ -52,6 +52,7 @@ static int session_setup(void **state)
 {
     struct torture_state *s = *state;
     int verbosity = torture_libssh_verbosity();
+    const char *all_keytypes = NULL;
     struct passwd *pwd;
     bool b = false;
     int rc;
@@ -71,6 +72,11 @@ static int session_setup(void **state)
     rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_PROCESS_CONFIG, &b);
     assert_ssh_return_code(s->ssh.session, rc);
 
+    /* Enable all hostkeys */
+    all_keytypes = ssh_kex_get_supported_method(SSH_HOSTKEYS);
+    rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_PUBLICKEY_ACCEPTED_TYPES, all_keytypes);
+    assert_ssh_return_code(s->ssh.session, rc);
+
     return 0;
 }