+++ /dev/null
-/*
- * Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
-
-/* Custom extension utility functions */
-
-#include <openssl/ct.h>
-#include "ssl_locl.h"
-
-/* Find a custom extension from the list. */
-static custom_ext_method *custom_ext_find(const custom_ext_methods *exts,
- unsigned int ext_type)
-{
- size_t i;
- custom_ext_method *meth = exts->meths;
- for (i = 0; i < exts->meths_count; i++, meth++) {
- if (ext_type == meth->ext_type)
- return meth;
- }
- return NULL;
-}
-
-/*
- * Initialise custom extensions flags to indicate neither sent nor received.
- */
-void custom_ext_init(custom_ext_methods *exts)
-{
- size_t i;
- custom_ext_method *meth = exts->meths;
- for (i = 0; i < exts->meths_count; i++, meth++)
- meth->ext_flags = 0;
-}
-
-/* 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)
-{
- 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 return success */
- if (!meth)
- return 1;
- if (!server) {
- /*
- * If it's ServerHello we can't have any extensions not sent in
- * ClientHello.
- */
- if (!(meth->ext_flags & SSL_EXT_FLAG_SENT)) {
- *al = TLS1_AD_UNSUPPORTED_EXTENSION;
- return 0;
- }
- }
- /* If already present it's a duplicate */
- if (meth->ext_flags & SSL_EXT_FLAG_RECEIVED) {
- *al = TLS1_AD_DECODE_ERROR;
- 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.
- */
-int custom_ext_add(SSL *s, int server, WPACKET *pkt, int *al)
-{
- custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
- custom_ext_method *meth;
- size_t i;
-
- for (i = 0; i < exts->meths_count; i++) {
- const unsigned char *out = NULL;
- size_t outlen = 0;
-
- meth = exts->meths + i;
-
- if (server) {
- /*
- * For ServerHello only send extensions present in ClientHello.
- */
- if (!(meth->ext_flags & SSL_EXT_FLAG_RECEIVED))
- continue;
- /* If callback absent for server skip it */
- if (!meth->add_cb)
- continue;
- }
- if (meth->add_cb) {
- int cb_retval = 0;
- cb_retval = meth->add_cb(s, meth->ext_type,
- &out, &outlen, al, meth->add_arg);
- if (cb_retval < 0)
- return 0; /* error */
- if (cb_retval == 0)
- continue; /* skip this extension */
- }
-
- if (!WPACKET_put_bytes_u16(pkt, meth->ext_type)
- || !WPACKET_start_sub_packet_u16(pkt)
- || (outlen > 0 && !WPACKET_memcpy(pkt, out, outlen))
- || !WPACKET_close(pkt)) {
- *al = SSL_AD_INTERNAL_ERROR;
- return 0;
- }
- /*
- * 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 that it is
- * not an error if the extension is present in ServerHello.
- */
- meth->ext_flags |= SSL_EXT_FLAG_SENT;
- if (meth->free_cb)
- meth->free_cb(s, meth->ext_type, out, meth->add_arg);
- }
- return 1;
-}
-
-/* Copy table of custom extensions */
-int custom_exts_copy(custom_ext_methods *dst, const custom_ext_methods *src)
-{
- if (src->meths_count) {
- dst->meths =
- OPENSSL_memdup(src->meths,
- sizeof(custom_ext_method) * src->meths_count);
- if (dst->meths == NULL)
- return 0;
- dst->meths_count = src->meths_count;
- }
- return 1;
-}
-
-void custom_exts_free(custom_ext_methods *exts)
-{
- OPENSSL_free(exts->meths);
-}
-
-/* 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, *tmp;
- /*
- * 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, but make exception
- * for extension types that previously were not supported, but now are.
- */
- if (SSL_extension_supported(ext_type) &&
- ext_type != TLSEXT_TYPE_signed_certificate_timestamp)
- return 0;
- /* Extension type must fit in 16 bits */
- if (ext_type > 0xffff)
- return 0;
- /* Search for duplicate */
- if (custom_ext_find(exts, ext_type))
- return 0;
- tmp = OPENSSL_realloc(exts->meths,
- (exts->meths_count + 1) * sizeof(custom_ext_method));
-
- if (tmp == NULL)
- return 0;
-
- exts->meths = tmp;
- meth = exts->meths + exts->meths_count;
- memset(meth, 0, sizeof(*meth));
- meth->parse_cb = parse_cb;
- meth->add_cb = add_cb;
- meth->free_cb = free_cb;
- meth->ext_type = ext_type;
- meth->add_arg = add_arg;
- meth->parse_arg = parse_arg;
- exts->meths_count++;
- return 1;
-}
-
-/* Return true if a client custom extension exists, false otherwise */
-int SSL_CTX_has_client_custom_ext(const SSL_CTX *ctx, unsigned int ext_type)
-{
- return custom_ext_find(&ctx->cert->cli_ext, ext_type) != NULL;
-}
-
-/* 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)
-{
-#ifndef OPENSSL_NO_CT
- /*
- * We don't want applications registering callbacks for SCT extensions
- * whilst simultaneously using the built-in SCT validation features, as
- * these two things may not play well together.
- */
- if (ext_type == TLSEXT_TYPE_signed_certificate_timestamp &&
- SSL_CTX_ct_is_enabled(ctx))
- return 0;
-#endif
- 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_meth_add(&ctx->cert->srv_ext, ext_type,
- add_cb, free_cb, add_arg, parse_cb, parse_arg);
-}
-
-int SSL_extension_supported(unsigned int ext_type)
-{
- switch (ext_type) {
- /* Internally supported extensions. */
- case TLSEXT_TYPE_application_layer_protocol_negotiation:
-#ifndef OPENSSL_NO_EC
- case TLSEXT_TYPE_ec_point_formats:
- case TLSEXT_TYPE_supported_groups:
- case TLSEXT_TYPE_key_share:
-#endif
-#ifndef OPENSSL_NO_NEXTPROTONEG
- case TLSEXT_TYPE_next_proto_neg:
-#endif
- case TLSEXT_TYPE_padding:
- case TLSEXT_TYPE_renegotiate:
- case TLSEXT_TYPE_server_name:
- case TLSEXT_TYPE_session_ticket:
- case TLSEXT_TYPE_signature_algorithms:
-#ifndef OPENSSL_NO_SRP
- case TLSEXT_TYPE_srp:
-#endif
-#ifndef OPENSSL_NO_OCSP
- case TLSEXT_TYPE_status_request:
-#endif
-#ifndef OPENSSL_NO_CT
- case TLSEXT_TYPE_signed_certificate_timestamp:
-#endif
-#ifndef OPENSSL_NO_SRTP
- case TLSEXT_TYPE_use_srtp:
-#endif
- case TLSEXT_TYPE_encrypt_then_mac:
- case TLSEXT_TYPE_supported_versions:
- case TLSEXT_TYPE_extended_master_secret:
- case TLSEXT_TYPE_psk_kex_modes:
- case TLSEXT_TYPE_cookie:
- case TLSEXT_TYPE_early_data:
- case TLSEXT_TYPE_certificate_authorities:
- case TLSEXT_TYPE_psk:
- return 1;
- default:
- return 0;
- }
-}
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