#ifndef OPENSSL_NO_TLSEXT
-/* Find a custom extension from the list */
-
+/* Find a custom extension from the list. */
static custom_ext_method *custom_ext_find(custom_ext_methods *exts,
- unsigned short ext_type)
+ unsigned int ext_type)
{
size_t i;
custom_ext_method *meth = exts->meths;
meth->ext_flags = 0;
}
-/* pass received custom extension data to the application for parsing */
-
+/* Pass received custom extension data to the application for parsing. */
int custom_ext_parse(SSL *s, int server,
- unsigned int ext_type,
- const unsigned char *ext_data,
- size_t ext_size,
- int *al)
+ unsigned int ext_type,
+ const unsigned char *ext_data,
+ size_t ext_size,
+ int *al)
{
custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
custom_ext_method *meth;
meth = custom_ext_find(exts, ext_type);
- /* If not found or no parse function set, return success */
/* If not found return success */
if (!meth)
return 1;
return 0;
}
meth->ext_flags |= SSL_EXT_FLAG_RECEIVED;
+ /* If no parse function set return success */
if (!meth->parse_cb)
return 1;
return meth->parse_cb(s, ext_type, ext_data, ext_size, al, meth->parse_arg);
}
-/* request custom extension data from the application and add to the
- * return buffer
+/* Request custom extension data from the application and add to the
+ * return buffer.
*/
-
int custom_ext_add(SSL *s, int server,
- unsigned char **pret,
- unsigned char *limit,
- int *al)
+ unsigned char **pret,
+ unsigned char *limit,
+ int *al)
{
custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
custom_ext_method *meth;
memcpy(ret, out, outlen);
ret += outlen;
}
- /* We can't send duplicates: code logic should prevent this */
+ /* We can't send duplicates: code logic should prevent this. */
OPENSSL_assert(!(meth->ext_flags & SSL_EXT_FLAG_SENT));
/* Indicate extension has been sent: this is both a sanity
* check to ensure we don't send duplicate extensions
- * and indicates to servers that an extension can be
- * sent in ServerHello.
+ * and indicates that it is not an error if the extension
+ * is present in ServerHello.
*/
meth->ext_flags |= SSL_EXT_FLAG_SENT;
if (meth->free_cb)
}
/* Copy table of custom extensions */
-
int custom_exts_copy(custom_ext_methods *dst, const custom_ext_methods *src)
{
if (src->meths_count)
OPENSSL_free(exts->meths);
}
-/* Set callbacks for a custom extension */
-static int custom_ext_set(custom_ext_methods *exts,
- unsigned int ext_type,
- custom_ext_add_cb add_cb,
- custom_ext_free_cb free_cb,
- void *add_arg,
- custom_ext_parse_cb parse_cb, void *parse_arg)
+/* Set callbacks for a custom extension. */
+static int custom_ext_meth_add(custom_ext_methods *exts,
+ unsigned int ext_type,
+ custom_ext_add_cb add_cb,
+ custom_ext_free_cb free_cb,
+ void *add_arg,
+ custom_ext_parse_cb parse_cb, void *parse_arg)
{
custom_ext_method *meth;
- /* See if it is a supported internally */
- switch(ext_type)
- {
- case TLSEXT_TYPE_application_layer_protocol_negotiation:
- case TLSEXT_TYPE_ec_point_formats:
- case TLSEXT_TYPE_elliptic_curves:
- case TLSEXT_TYPE_heartbeat:
- case TLSEXT_TYPE_next_proto_neg:
- case TLSEXT_TYPE_padding:
- case TLSEXT_TYPE_renegotiate:
- case TLSEXT_TYPE_server_name:
- case TLSEXT_TYPE_session_ticket:
- case TLSEXT_TYPE_signature_algorithms:
- case TLSEXT_TYPE_srp:
- case TLSEXT_TYPE_status_request:
- case TLSEXT_TYPE_use_srtp:
-#ifdef TLSEXT_TYPE_opaque_prf_input
- case TLSEXT_TYPE_opaque_prf_input:
-#endif
-#ifdef TLSEXT_TYPE_encrypt_then_mac
- case TLSEXT_TYPE_encrypt_then_mac:
-#endif
+ /* Check application error: if add_cb is not set free_cb will never
+ * be called.
+ */
+ if (!add_cb && free_cb)
+ return 0;
+ /* Don't add if extension supported internally. */
+ if (SSL_extension_supported(ext_type))
return 0;
- }
/* Extension type must fit in 16 bits */
if (ext_type > 0xffff)
return 0;
if (custom_ext_find(exts, ext_type))
return 0;
exts->meths = OPENSSL_realloc(exts->meths,
- (exts->meths_count + 1) * sizeof(custom_ext_method));
+ (exts->meths_count + 1) * sizeof(custom_ext_method));
if (!exts->meths)
{
}
/* Application level functions to add custom extension callbacks */
+int SSL_CTX_add_client_custom_ext(SSL_CTX *ctx, unsigned int ext_type,
+ custom_ext_add_cb add_cb,
+ custom_ext_free_cb free_cb,
+ void *add_arg,
+ custom_ext_parse_cb parse_cb, void *parse_arg)
-int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned int ext_type,
- custom_ext_add_cb add_cb,
- custom_ext_free_cb free_cb,
- void *add_arg,
- custom_ext_parse_cb parse_cb, void *parse_arg)
+ {
+ return custom_ext_meth_add(&ctx->cert->cli_ext, ext_type,
+ add_cb, free_cb, add_arg,
+ parse_cb, parse_arg);
+ }
+int SSL_CTX_add_server_custom_ext(SSL_CTX *ctx, unsigned int ext_type,
+ custom_ext_add_cb add_cb,
+ custom_ext_free_cb free_cb,
+ void *add_arg,
+ custom_ext_parse_cb parse_cb, void *parse_arg)
{
- return custom_ext_set(&ctx->cert->cli_ext, ext_type,
- add_cb, free_cb, add_arg,
- parse_cb, parse_arg);
+ return custom_ext_meth_add(&ctx->cert->srv_ext, ext_type,
+ add_cb, free_cb, add_arg,
+ parse_cb, parse_arg);
}
-int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned int ext_type,
- custom_ext_add_cb add_cb,
- custom_ext_free_cb free_cb,
- void *add_arg,
- custom_ext_parse_cb parse_cb, void *parse_arg)
+int SSL_extension_supported(unsigned int ext_type)
{
- return custom_ext_set(&ctx->cert->srv_ext, ext_type,
- add_cb, free_cb, add_arg,
- parse_cb, parse_arg);
+ switch(ext_type)
+ {
+ /* Internally supported extensions. */
+ case TLSEXT_TYPE_application_layer_protocol_negotiation:
+ case TLSEXT_TYPE_ec_point_formats:
+ case TLSEXT_TYPE_elliptic_curves:
+ case TLSEXT_TYPE_heartbeat:
+ case TLSEXT_TYPE_next_proto_neg:
+ case TLSEXT_TYPE_padding:
+ case TLSEXT_TYPE_renegotiate:
+ case TLSEXT_TYPE_server_name:
+ case TLSEXT_TYPE_session_ticket:
+ case TLSEXT_TYPE_signature_algorithms:
+ case TLSEXT_TYPE_srp:
+ case TLSEXT_TYPE_status_request:
+ case TLSEXT_TYPE_use_srtp:
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ case TLSEXT_TYPE_opaque_prf_input:
+#endif
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ case TLSEXT_TYPE_encrypt_then_mac:
+#endif
+ return 1;
+ default:
+ return 0;
+ }
}
#endif
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