413 lines
10 KiB
C
413 lines
10 KiB
C
/**
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* @file child_sa.c
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*
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* @brief Implementation of child_sa_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "child_sa.h"
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#include <utils/allocator.h>
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#include <daemon.h>
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typedef struct private_child_sa_t private_child_sa_t;
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/**
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* Private data of a child_sa_t object.
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*/
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struct private_child_sa_t {
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/**
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* Public interface of child_sa_t.
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*/
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child_sa_t public;
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/**
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* IP of this peer
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*/
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host_t *me;
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/**
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* IP of other peer
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*/
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host_t *other;
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/**
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* Security parameter index for AH protocol, 0 if not used
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*/
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u_int32_t ah_spi;
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/**
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* Security parameter index for ESP protocol, 0 if not used
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*/
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u_int32_t esp_spi;
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/**
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* reqid used for this child_sa
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*/
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u_int32_t reqid;
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/**
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* CHILD_SAs own logger
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*/
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logger_t *logger;
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};
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/**
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* Implements child_sa_t.alloc
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*/
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static status_t alloc(private_child_sa_t *this, linked_list_t *proposals)
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{
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protocol_id_t protocols[2];
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iterator_t *iterator;
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proposal_t *proposal;
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status_t status;
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u_int i;
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/* iterator through proposals */
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iterator = proposals->create_iterator(proposals, TRUE);
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while(iterator->has_next(iterator))
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{
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iterator->current(iterator, (void**)&proposal);
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proposal->get_protocols(proposal, protocols);
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/* check all protocols */
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for (i = 0; i<2; i++)
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{
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switch (protocols[i])
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{
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case AH:
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/* do we already have an spi for AH?*/
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if (this->ah_spi == 0)
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{
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/* nope, get one */
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status = charon->kernel_interface->get_spi(
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charon->kernel_interface,
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this->me, this->other,
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AH, FALSE,
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&(this->ah_spi));
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}
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/* update proposal */
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proposal->set_spi(proposal, AH, (u_int64_t)this->ah_spi);
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break;
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case ESP:
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/* do we already have an spi for ESP?*/
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if (this->esp_spi == 0)
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{
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/* nope, get one */
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status = charon->kernel_interface->get_spi(
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charon->kernel_interface,
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this->me, this->other,
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ESP, FALSE,
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&(this->esp_spi));
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}
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/* update proposal */
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proposal->set_spi(proposal, ESP, (u_int64_t)this->esp_spi);
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break;
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default:
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break;
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}
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if (status != SUCCESS)
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{
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iterator->destroy(iterator);
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return FAILED;
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}
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}
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}
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iterator->destroy(iterator);
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return SUCCESS;
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}
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static status_t install(private_child_sa_t *this, proposal_t *proposal, prf_plus_t *prf_plus, bool mine)
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{
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protocol_id_t protocols[2];
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u_int32_t spi;
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encryption_algorithm_t enc_algo;
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integrity_algorithm_t int_algo;
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chunk_t enc_key, int_key;
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algorithm_t *algo;
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crypter_t *crypter;
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signer_t *signer;
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size_t key_size;
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host_t *src;
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host_t *dst;
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status_t status;
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u_int i;
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/* we must assign the roles to correctly set up the SAs */
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if (mine)
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{
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src = this->me;
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dst = this->other;
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}
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else
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{
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dst = this->me;
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src = this->other;
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}
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proposal->get_protocols(proposal, protocols);
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/* derive keys in order as protocols appear */
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for (i = 0; i<2; i++)
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{
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if (protocols[i] != UNDEFINED_PROTOCOL_ID)
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{
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/* now we have to decide which spi to use. Use self allocated, if "mine",
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* or the one in the proposal, if not "mine" (others). */
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if (mine)
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{
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if (protocols[i] == AH)
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{
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spi = this->ah_spi;
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}
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else
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{
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spi = this->esp_spi;
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}
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}
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else /* use proposals spi */
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{
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spi = proposal->get_spi(proposal, protocols[i]);
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}
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/* derive encryption key first */
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if (proposal->get_algorithm(proposal, protocols[i], ENCRYPTION_ALGORITHM, &algo))
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{
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enc_algo = algo->algorithm;
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this->logger->log(this->logger, CONTROL|LEVEL1, "%s for %s: using %s %s, ",
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mapping_find(protocol_id_m, protocols[i]),
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mine ? "me" : "other",
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mapping_find(transform_type_m, ENCRYPTION_ALGORITHM),
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mapping_find(encryption_algorithm_m, enc_algo));
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/* we must create a (unused) crypter, since its the only way to get the size
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* of the key. This is not so nice, since charon must support all algorithms
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* the kernel supports...
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* TODO: build something of a encryption algorithm lookup function
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*/
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crypter = crypter_create(enc_algo, algo->key_size);
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key_size = crypter->get_key_size(crypter);
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crypter->destroy(crypter);
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prf_plus->allocate_bytes(prf_plus, key_size, &enc_key);
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this->logger->log_chunk(this->logger, PRIVATE, "key:", &enc_key);
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}
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else
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{
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enc_algo = ENCR_UNDEFINED;
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}
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/* derive integrity key */
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if (proposal->get_algorithm(proposal, protocols[i], INTEGRITY_ALGORITHM, &algo))
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{
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int_algo = algo->algorithm;
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this->logger->log(this->logger, CONTROL|LEVEL1, "%s for %s: using %s %s,",
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mapping_find(protocol_id_m, protocols[i]),
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mine ? "me" : "other",
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mapping_find(transform_type_m, INTEGRITY_ALGORITHM),
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mapping_find(integrity_algorithm_m, algo->algorithm));
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signer = signer_create(int_algo);
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key_size = signer->get_key_size(signer);
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signer->destroy(signer);
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prf_plus->allocate_bytes(prf_plus, key_size, &int_key);
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this->logger->log_chunk(this->logger, PRIVATE, "key:", &int_key);
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}
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else
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{
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int_algo = AUTH_UNDEFINED;
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}
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/* send keys down to kernel */
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this->logger->log(this->logger, CONTROL|LEVEL1,
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"installing 0x%.8x for %s, src %s dst %s",
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ntohl(spi), mapping_find(protocol_id_m, protocols[i]),
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src->get_address(src), dst->get_address(dst));
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status = charon->kernel_interface->add_sa(charon->kernel_interface,
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src, dst,
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spi, protocols[i],
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this->reqid,
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enc_algo, enc_key,
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int_algo, int_key, mine);
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/* clean up for next round */
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if (enc_algo != ENCR_UNDEFINED)
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{
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allocator_free_chunk(&enc_key);
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}
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if (int_algo != AUTH_UNDEFINED)
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{
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allocator_free_chunk(&int_key);
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}
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if (status != SUCCESS)
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{
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return FAILED;
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}
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}
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}
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return SUCCESS;
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}
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static status_t add(private_child_sa_t *this, proposal_t *proposal, prf_plus_t *prf_plus)
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{
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linked_list_t *list;
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/* install others (initiators) SAs*/
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if (install(this, proposal, prf_plus, FALSE) != SUCCESS)
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{
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return FAILED;
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}
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/* get SPIs for our SAs */
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list = linked_list_create();
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list->insert_last(list, proposal);
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if (alloc(this, list) != SUCCESS)
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{
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list->destroy(list);
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return FAILED;
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}
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list->destroy(list);
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/* install our (responders) SAs */
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if (install(this, proposal, prf_plus, TRUE) != SUCCESS)
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{
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return FAILED;
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}
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return SUCCESS;
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}
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static status_t update(private_child_sa_t *this, proposal_t *proposal, prf_plus_t *prf_plus)
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{
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/* install our (initator) SAs */
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if (install(this, proposal, prf_plus, TRUE) != SUCCESS)
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{
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return FAILED;
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}
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/* install his (responder) SAs */
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if (install(this, proposal, prf_plus, FALSE) != SUCCESS)
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{
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return FAILED;
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}
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return SUCCESS;
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}
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static status_t add_policy(private_child_sa_t *this, linked_list_t *my_ts, linked_list_t *other_ts)
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{
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traffic_selector_t *local_ts, *remote_ts;
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host_t *my_net, *other_net;
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u_int8_t my_mask, other_mask;
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int family;
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chunk_t from_addr, to_addr;
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u_int16_t from_port, to_port;
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my_ts->get_first(my_ts, (void**)&local_ts);
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other_ts->get_first(other_ts, (void**)&remote_ts);
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family = local_ts->get_type(local_ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
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from_addr = local_ts->get_from_address(local_ts);
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//to_addr = local_ts->get_to_address(local_ts);
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from_port = local_ts->get_from_port(local_ts);
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to_port = local_ts->get_to_port(local_ts);
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if (from_port != to_port)
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{
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from_port = 0;
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}
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my_net = host_create_from_chunk(family, from_addr, from_port);
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allocator_free_chunk(&from_addr);
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my_mask = 16;
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family = remote_ts->get_type(remote_ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
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from_addr = remote_ts->get_from_address(remote_ts);
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//to_addr = remote_ts->get_to_address(remote_ts);
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from_port = remote_ts->get_from_port(remote_ts);
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to_port = remote_ts->get_to_port(remote_ts);
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if (from_port != to_port)
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{
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from_port = 0;
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}
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other_net = host_create_from_chunk(family, from_addr, from_port);
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allocator_free_chunk(&from_addr);
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other_mask = 16;
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charon->kernel_interface->add_policy(charon->kernel_interface,
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this->me, this->other,
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my_net, other_net,
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my_mask, other_mask,
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XFRM_POLICY_OUT,
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0, this->ah_spi, this->esp_spi,
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this->reqid);
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charon->kernel_interface->add_policy(charon->kernel_interface,
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this->me, this->other,
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other_net, my_net,
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other_mask, my_mask,
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XFRM_POLICY_IN,
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0, this->ah_spi, this->esp_spi,
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this->reqid);
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charon->kernel_interface->add_policy(charon->kernel_interface,
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this->me, this->other,
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other_net, my_net,
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other_mask, my_mask,
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XFRM_POLICY_FWD,
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0, this->ah_spi, this->esp_spi,
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this->reqid);
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return SUCCESS;
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}
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/**
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* Implementation of child_sa_t.destroy.
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*/
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static void destroy(private_child_sa_t *this)
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{
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charon->logger_manager->destroy_logger(charon->logger_manager, this->logger);
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allocator_free(this);
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}
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/*
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* Described in header.
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*/
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child_sa_t * child_sa_create(host_t *me, host_t* other)
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{
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static u_int32_t reqid = 123;
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private_child_sa_t *this = allocator_alloc_thing(private_child_sa_t);
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/* public functions */
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this->public.alloc = (status_t(*)(child_sa_t*,linked_list_t*))alloc;
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this->public.add = (status_t(*)(child_sa_t*,proposal_t*,prf_plus_t*))add;
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this->public.update = (status_t(*)(child_sa_t*,proposal_t*,prf_plus_t*))update;
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this->public.add_policy = (status_t (*)(child_sa_t*, linked_list_t*,linked_list_t*))add_policy;
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this->public.destroy = (void(*)(child_sa_t*))destroy;
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/* private data */
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this->logger = charon->logger_manager->create_logger(charon->logger_manager, CHILD_SA, NULL);
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this->me = me;
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this->other = other;
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this->ah_spi = 0;
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this->esp_spi = 0;
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this->reqid = reqid++;
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return (&this->public);
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}
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