Enable all protocols and ciphers in the fuzzer

The config file can override it.
In case of the server, it needs to be set on the ctx or some of the
other functions on the ctx might file.

Reviewed-by: Rich Salz <rsalz@openssl.org>
DH: #6718

fuzz/client.c

@@ -73,6 +73,7 @@ int FuzzerTestOneInput(const uint8_t *buf, size_t len)
     ctx = SSL_CTX_new(SSLv23_method());
 
     client = SSL_new(ctx);
+    OPENSSL_assert(SSL_set_min_proto_version(client, 0) == 1);
     OPENSSL_assert(SSL_set_cipher_list(client, "ALL:eNULL:@SECLEVEL=0") == 1);
     SSL_set_tlsext_host_name(client, "localhost");
     in = BIO_new(BIO_s_mem());

fuzz/server.c

@@ -534,6 +534,11 @@ int FuzzerTestOneInput(const uint8_t *buf, size_t len)
     /* This only fuzzes the initial flow from the client so far. */
     ctx = SSL_CTX_new(SSLv23_method());
 
+    ret = SSL_CTX_set_min_proto_version(ctx, 0);
+    OPENSSL_assert(ret == 1);
+    ret = SSL_CTX_set_cipher_list(ctx, "ALL:eNULL:@SECLEVEL=0");
+    OPENSSL_assert(ret == 1);
+
     /* RSA */
     bufp = kRSAPrivateKeyDER;
     privkey = d2i_RSAPrivateKey(NULL, &bufp, sizeof(kRSAPrivateKeyDER));
@@ -602,8 +607,6 @@ int FuzzerTestOneInput(const uint8_t *buf, size_t len)
     /* TODO: Set up support for SRP and PSK */
 
     server = SSL_new(ctx);
-    ret = SSL_set_cipher_list(server, "ALL:eNULL:@SECLEVEL=0");
-    OPENSSL_assert(ret == 1);
     in = BIO_new(BIO_s_mem());
     out = BIO_new(BIO_s_mem());
     SSL_set_bio(server, in, out);