329 lines
13 KiB
C
Executable File
329 lines
13 KiB
C
Executable File
/* Copyright (C) 2010-2014 Mamadou DIOP
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* Copyright (C) 2011-2014 Doubango Telecom <http://www.doubango.org>
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*
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* This file is part of Open Source Doubango Framework.
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*
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* DOUBANGO is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DOUBANGO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with DOUBANGO.
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*/
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/**@file tipsec.c
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* @brief IPSec plugin and context managers.
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*
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* @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
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*/
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#include "tipsec.h"
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#include "tsk_plugin.h"
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#include "tsk_debug.h"
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/** Max number of plugins (consumer types) we can create */
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#if !defined(TIPSEC_MAX_PLUGINS)
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# define TIPSEC_MAX_PLUGINS 0x04
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#endif /* TIPSEC_MAX_PLUGINS */
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/* pointer to all registered consumers */
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static const tipsec_plugin_def_t* __tipsec_plugins[TIPSEC_MAX_PLUGINS] = { tsk_null };
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/**
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* Create an IPSec context to manage the SAs.
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* Before calling this function at least one special implementation must be registered using @ref tipsec_plugin_register_static().
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* @param ipproto IPSec internet protocol.
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* @param use_ipv6 Whether to use IPv6 or not (IPv4).
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* @param mode IPSec mode.
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* @param ealg IPSec encryption algorithm.
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* @param alg IPSec algorithm.
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* @param protocol IPSec protocol.
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* @param pp_ctx Pointer holding the newly created context. Valid only if the retured code is @ref tipsec_error_success. This object must be destroyed using @a TSK_OBJECT_SAFE_FREE().
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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*/
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tipsec_error_t tipsec_ctx_create(
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tipsec_ipproto_t ipproto,
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tsk_bool_t use_ipv6,
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tipsec_mode_t mode,
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tipsec_ealg_t ealg,
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tipsec_alg_t alg,
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tipsec_proto_t protocol,
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tipsec_ctx_t** pp_ctx)
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{
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tipsec_error_t err = tipsec_error_success;
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tsk_size_t i = 0;
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const tipsec_plugin_def_t* pc_plugin = tsk_null;
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tipsec_ctx_t* p_ctx = tsk_null;
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if (!pp_ctx || *pp_ctx) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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// Create the context using the plugins registry
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while ((i < TIPSEC_MAX_PLUGINS) && (pc_plugin = __tipsec_plugins[i++])) {
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if (pc_plugin->objdef) {
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if ((p_ctx = tsk_object_new(pc_plugin->objdef))) {
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/* initialize the newly IPSec context */
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p_ctx->pc_plugin = pc_plugin;
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p_ctx->initialized = 0;
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p_ctx->started = 0;
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p_ctx->state = tipsec_state_initial;
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p_ctx->use_ipv6 = use_ipv6;
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p_ctx->mode = mode;
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p_ctx->ealg = ealg;
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p_ctx->alg = alg;
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p_ctx->protocol = protocol;
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p_ctx->ipproto = ipproto;
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break;
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}
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}
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}
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if (!pc_plugin || !p_ctx) {
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TSK_DEBUG_ERROR("Failed to find/create a plugin instance");
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return tipsec_error_notfound;
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}
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// Initialize the newly created context
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err = pc_plugin->init(p_ctx);
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if (err) {
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goto bail;
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}
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bail:
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if (err) {
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TSK_OBJECT_SAFE_FREE(p_ctx);
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}
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*pp_ctx = p_ctx;
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return err;
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}
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/**
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* Ensure the SAs. This function must be called before sending/receiving any data.
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* @param p_ctx Pointer to a context created using @ref tipsec_ctx_create().
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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*/
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tipsec_error_t tipsec_ctx_start(tipsec_ctx_t* p_ctx)
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{
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if (!p_ctx || !p_ctx->pc_plugin) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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if (!p_ctx->initialized || p_ctx->state != tipsec_state_full) {
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TSK_DEBUG_ERROR("Invalid state (not initialized or not in full state)");
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return tipsec_error_invalid_state;
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}
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return p_ctx->pc_plugin->start(p_ctx);
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}
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/**
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* Set local information. On windows Vista and later this function must be called to request local SPIs.
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* @param p_ctx Pointer to a context created using @ref tipsec_ctx_create().
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* @param addr_local Local IP address (e.g. "192.168.0.5"). The IP version depends on whether @a use_param (0 or 1) when @ref tipsec_ctx_create() was used to create the context.
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* @param addr_remote Remote IP address (e.g. "192.168.0.5"). The IP version depends on whether @a use_param (0 or 1) when @ref tipsec_ctx_create() was used to create the context.
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* @param port_uc Local client port used to send data. Must be within [1024-65535].
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* @param port_us Local server port used to received data. Must be within [1024-65535].
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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*/
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tipsec_error_t tipsec_ctx_set_local(tipsec_ctx_t* p_ctx, const char* addr_local, const char* addr_remote, tipsec_port_t port_uc, tipsec_port_t port_us)
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{
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if (!p_ctx || !p_ctx->pc_plugin || !addr_local || !addr_remote || port_uc < 1024 || port_us < 1024) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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if (!p_ctx->initialized || p_ctx->state != tipsec_state_initial) {
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TSK_DEBUG_ERROR("Invalid state (not initialized or not in initial state)");
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return tipsec_error_invalid_state;
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}
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return p_ctx->pc_plugin->set_local(p_ctx, addr_local, addr_remote, port_uc, port_us);
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}
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/**
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* Set Integrity (IK) and Confidentiality (CK) Keys.
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* On the UE, the IK and CK are built using the "nonce" value using the 494 from the P-CSCF which means the function must be called after the REGISTER<->494 round trip.
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* @param p_ctx Pointer to a context created using @ref tipsec_ctx_create().
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* @param ik The Integrity Key.
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* @param ck The Confidentiality Key.
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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*/
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tipsec_error_t tipsec_ctx_set_keys(tipsec_ctx_t* p_ctx, const tipsec_key_t* ik, const tipsec_key_t* ck)
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{
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if (!p_ctx || !p_ctx->pc_plugin || !ik || !ck) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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return p_ctx->pc_plugin->set_keys(p_ctx, ik, ck);
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}
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/**
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* Set the remote information.
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* @param p_ctx Pointer to a context created using @ref tipsec_ctx_create().
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* @param spi_pc Remote client SPI (Security Parameter Index) used by the remote party to send data.
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* @param spi_ps Remote server SPI (Security Parameter Index) used by the remote party to receive data.
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* @param port_pc Remote client port used by the remote party to send data. Must be within [1024-65535].
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* @param port_ps Remote server port used by the remote party to receive data. Must be within [1024-65535].
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* @param lifetime The SA lifetime (in seconds). Must not be null. Should be 2xSipRegistrationTimeout. On Windows vista and later, the maximum allowed value is @a 172799 seconds.
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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*/
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tipsec_error_t tipsec_ctx_set_remote(tipsec_ctx_t* p_ctx, tipsec_spi_t spi_pc, tipsec_spi_t spi_ps, tipsec_port_t port_pc, tipsec_port_t port_ps, tipsec_lifetime_t lifetime)
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{
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if (!p_ctx || !p_ctx->pc_plugin || port_pc < 1024 || port_ps < 1024 || !lifetime) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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if (!p_ctx->initialized || p_ctx->state != tipsec_state_inbound) {
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TSK_DEBUG_ERROR("Invalid state (not initialized or not in initial state)");
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return tipsec_error_invalid_state;
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}
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return p_ctx->pc_plugin->set_remote(p_ctx, spi_pc, spi_ps, port_pc, port_ps, lifetime);
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}
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/**
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* Shutdown all SAs associated to this context. It's no longer allowed to send/recv data after calling this function.
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* @param p_ctx Pointer to a context created using @ref tipsec_ctx_create().
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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*/
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tipsec_error_t tipsec_ctx_stop(tipsec_ctx_t* p_ctx)
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{
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if (!p_ctx || !p_ctx->pc_plugin) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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return p_ctx->pc_plugin->stop(p_ctx);
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}
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/**
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* Register an IPSec special implementation (e.g. Windows XP, Windows Vista or Linux IPSec-Tools) using a static definition.
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* @param pc_plugin pointer to the static definition.
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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* @sa @ref tipsec_plugin_unregister_static(), @ref tipsec_plugin_unregister_file()
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*/
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tipsec_error_t tipsec_plugin_register_static(const tipsec_plugin_def_t* pc_plugin)
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{
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tsk_size_t i;
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if (!pc_plugin) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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/* add or replace the plugin */
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for (i = 0; i < TIPSEC_MAX_PLUGINS; ++i) {
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if (!__tipsec_plugins[i] || (__tipsec_plugins[i] == pc_plugin)) {
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__tipsec_plugins[i] = pc_plugin;
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TSK_DEBUG_INFO("Register IPSec implementation: %s", pc_plugin->desc);
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return tipsec_error_success;
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}
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}
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TSK_DEBUG_ERROR("There are already %d plugins.", TIPSEC_MAX_PLUGINS);
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return tipsec_error_outofbound;
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}
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/**
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* UnRegister an IPSec special implementation (e.g. Windows XP, Windows Vista or Linux IPSec-Tools) using a static definition.
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* @param pc_plugin pointer to the static definition.
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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* @sa @ref tipsec_plugin_register_static(), @ref tipsec_plugin_register_file()
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*/
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tipsec_error_t tipsec_plugin_unregister_static(const tipsec_plugin_def_t* pc_plugin)
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{
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tsk_size_t i;
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tsk_bool_t b_found = tsk_false;
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if (!pc_plugin) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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/* find the plugin to unregister */
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for (i = 0; i < TIPSEC_MAX_PLUGINS && __tipsec_plugins[i]; ++i) {
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if (__tipsec_plugins[i] == pc_plugin) {
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__tipsec_plugins[i] = tsk_null;
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b_found = tsk_true;
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TSK_DEBUG_INFO("UnRegister IPSec implementation: %s", pc_plugin->desc);
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break;
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}
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}
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/* compact */
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if (b_found) {
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for (; i < (TIPSEC_MAX_PLUGINS - 1); ++i) {
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if (__tipsec_plugins[i+1]) {
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__tipsec_plugins[i] = __tipsec_plugins[i + 1];
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}
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else {
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break;
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}
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}
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__tipsec_plugins[i] = tsk_null;
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}
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return (b_found ? tipsec_error_success : tipsec_error_notfound);
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}
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/**
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* Register an IPSec special implementation (e.g. Windows XP, Windows Vista or Linux IPSec-Tools) using a shared library (*.DLL, *.SO).
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* @param pc_filepath Path to the plugin.
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* @param pp_plugin Pointer to the newly created plugin. You must call @ref tipsec_plugin_unregister_file() when you no longer need to use the plugin.
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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* @sa @ref tipsec_plugin_unregister_static(), @ref tipsec_plugin_unregister_file()
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*/
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tipsec_error_t tipsec_plugin_register_file(const char* pc_filepath, struct tsk_plugin_s** pp_plugin)
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{
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struct tsk_plugin_s* p_plugin = tsk_null;
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tsk_plugin_def_ptr_const_t p_def;
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tipsec_error_t err = tipsec_error_success;
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int i = 0, count = 0;
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p_plugin = tsk_plugin_create(pc_filepath);
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if (!p_plugin) {
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return tipsec_error_notfound;
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}
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while ((p_def = tsk_plugin_get_def_2(p_plugin, tsk_plugin_def_type_ipsec, tsk_plugin_def_media_type_all, i++))) {
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if (p_def) {
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err = tipsec_plugin_register_static(p_def);
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if (!err) {
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++count;
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}
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}
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}
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if (count <= 0) {
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TSK_DEBUG_ERROR("No plugin in %s", pc_filepath);
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TSK_OBJECT_SAFE_FREE(p_plugin);
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return tipsec_error_notfound;
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}
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*pp_plugin = p_plugin;
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return err;
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}
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/**
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* UnRegister an IPSec special implementation (e.g. Windows XP, Windows Vista or Linux IPSec-Tools).
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* @param p_plugin Pointer to the plugin previously registered using @ref tipsec_plugin_register_file().
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* @retval @ref tipsec_error_success if no error; otherwise error code.
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* @sa @ref tipsec_plugin_unregister_static(), @ref tipsec_plugin_unregister_file()
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*/
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tipsec_error_t tipsec_plugin_unregister_file(struct tsk_plugin_s* p_plugin)
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{
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int i = 0;
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tsk_plugin_def_ptr_const_t p_def;
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if (!p_plugin) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return tipsec_error_invalid_param;
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}
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while ((p_def = tsk_plugin_get_def_2(p_plugin, tsk_plugin_def_type_ipsec, tsk_plugin_def_media_type_all, i++))) {
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if (p_def) {
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tipsec_plugin_unregister_static(p_def);
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}
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}
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return tipsec_error_success;
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}
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