In eap-radius, hand out received Framed-IP-Address attributes as virtual IP
This commit is contained in:
Martin Willi
@@ -0,0 +1,350 @@
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/*
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* Copyright (C) 2013 Martin Willi
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* Copyright (C) 2013 revosec AG
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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 "eap_radius_provider.h"
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#include <daemon.h>
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#include <collections/hashtable.h>
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#include <threading/mutex.h>
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typedef struct private_eap_radius_provider_t private_eap_radius_provider_t;
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typedef struct private_listener_t private_listener_t;
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/**
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* Private data of registered listener
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*/
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struct private_listener_t {
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/**
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* Implements listener_t interface
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*/
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listener_t public;
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/**
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* Leases not acquired yet, identification_t => entry_t
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*/
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hashtable_t *unclaimed;
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/**
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* Leases acquired, identification_t => entry_t
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*/
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hashtable_t *claimed;
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/**
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* Mutex to lock leases
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*/
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mutex_t *mutex;
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};
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/**
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* Private data of an eap_radius_provider_t object.
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*/
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struct private_eap_radius_provider_t {
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/**
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* Public eap_radius_provider_t interface.
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*/
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eap_radius_provider_t public;
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/**
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* Additionally implements the listener_t interface
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*/
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private_listener_t listener;
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};
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/**
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* Singleton instance of provider
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*/
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static eap_radius_provider_t *singleton = NULL;
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/**
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* Hashtable entry with leases
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*/
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typedef struct {
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/** identity we assigned the IP lease */
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identification_t *id;
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/** list of IP leases received from AAA, as host_t */
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linked_list_t *addrs;
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} entry_t;
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/**
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* destroy an entry_t
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*/
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static void destroy_entry(entry_t *this)
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{
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this->id->destroy(this->id);
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this->addrs->destroy_offset(this->addrs, offsetof(host_t, destroy));
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free(this);
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}
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/**
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* Get or create an entry from a locked hashtable
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*/
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static entry_t* get_or_create_entry(hashtable_t *hashtable, identification_t *id)
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{
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entry_t *entry;
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entry = hashtable->get(hashtable, id);
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if (!entry)
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{
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INIT(entry,
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.id = id->clone(id),
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.addrs = linked_list_create(),
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);
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hashtable->put(hashtable, entry->id, entry);
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}
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return entry;
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}
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/**
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* Put an entry to hashtable, or destroy it ife empty
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*/
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static void put_or_destroy_entry(hashtable_t *hashtable, entry_t *entry)
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{
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if (entry->addrs->get_count(entry->addrs) > 0)
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{
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hashtable->put(hashtable, entry->id, entry);
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}
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else
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{
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destroy_entry(entry);
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}
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}
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/**
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* Hashtable hash function
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*/
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static u_int hash(identification_t *id)
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{
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return chunk_hash_inc(id->get_encoding(id), id->get_type(id));
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}
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/**
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* Hashtable equals function
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*/
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static bool equals(identification_t *a, identification_t *b)
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{
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return a->equals(a, b);
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}
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/**
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* Insert an address entry to a locked claimed/unclaimed hashtable
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*/
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static void add_addr(private_eap_radius_provider_t *this,
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hashtable_t *hashtable, identification_t *id, host_t *host)
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{
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entry_t *entry;
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entry = get_or_create_entry(hashtable, id);
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entry->addrs->insert_last(entry->addrs, host);
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}
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/**
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* Remove the next address from the locked hashtable stored for given id
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*/
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static host_t* remove_addr(private_eap_radius_provider_t *this,
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hashtable_t *hashtable, identification_t *id)
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{
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entry_t *entry;
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host_t *addr = NULL;
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entry = hashtable->remove(hashtable, id);
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if (entry)
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{
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entry->addrs->remove_first(entry->addrs, (void**)&addr);
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put_or_destroy_entry(hashtable, entry);
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}
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return addr;
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}
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/**
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* Clean up unclaimed leases assigned for an IKE_SA
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*/
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static void release_unclaimed(private_listener_t *this, ike_sa_t *ike_sa)
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{
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identification_t *id;
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entry_t *entry;
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id = ike_sa->get_other_eap_id(ike_sa);
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this->mutex->lock(this->mutex);
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entry = this->unclaimed->remove(this->unclaimed, id);
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this->mutex->unlock(this->mutex);
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if (entry)
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{
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destroy_entry(entry);
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}
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}
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METHOD(listener_t, message_hook, bool,
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private_listener_t *this, ike_sa_t *ike_sa,
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message_t *message, bool incoming, bool plain)
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{
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if (plain && ike_sa->get_state(ike_sa) == IKE_ESTABLISHED &&
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!incoming && !message->get_request(message))
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{
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if ((ike_sa->get_version(ike_sa) == IKEV1 &&
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message->get_exchange_type(message) == TRANSACTION) ||
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(ike_sa->get_version(ike_sa) == IKEV2 &&
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message->get_exchange_type(message) == IKE_AUTH))
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{
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/* if the addresses have not been claimed yet, they won't. Release
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* these ressources. */
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release_unclaimed(this, ike_sa);
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}
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}
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return TRUE;
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}
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METHOD(listener_t, ike_updown, bool,
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private_listener_t *this, ike_sa_t *ike_sa, bool up)
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{
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if (!up)
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{
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/* if the message hook does not apply because of a failed exchange
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* or something, make sure we release any ressources now */
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release_unclaimed(this, ike_sa);
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}
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return TRUE;
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}
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METHOD(attribute_provider_t, acquire_address, host_t*,
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private_eap_radius_provider_t *this, linked_list_t *pools,
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identification_t *id, host_t *requested)
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{
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enumerator_t *enumerator;
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host_t *addr = NULL;
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char *name;
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enumerator = pools->create_enumerator(pools);
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while (enumerator->enumerate(enumerator, &name))
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{
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if (streq(name, "radius"))
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{
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this->listener.mutex->lock(this->listener.mutex);
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addr = remove_addr(this, this->listener.unclaimed, id);
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if (addr)
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{
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add_addr(this, this->listener.claimed, id, addr->clone(addr));
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}
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this->listener.mutex->unlock(this->listener.mutex);
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break;
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}
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}
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enumerator->destroy(enumerator);
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return addr;
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}
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METHOD(attribute_provider_t, release_address, bool,
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private_eap_radius_provider_t *this, linked_list_t *pools, host_t *address,
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identification_t *id)
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{
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enumerator_t *enumerator;
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host_t *found = NULL;
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char *name;
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enumerator = pools->create_enumerator(pools);
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while (enumerator->enumerate(enumerator, &name))
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{
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if (streq(name, "radius"))
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{
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this->listener.mutex->lock(this->listener.mutex);
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found = remove_addr(this, this->listener.claimed, id);
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this->listener.mutex->unlock(this->listener.mutex);
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break;
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}
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}
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enumerator->destroy(enumerator);
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if (found)
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{
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found->destroy(found);
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return TRUE;
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}
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return FALSE;
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}
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METHOD(attribute_provider_t, create_attribute_enumerator, enumerator_t*,
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private_eap_radius_provider_t *this, linked_list_t *pools,
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identification_t *id, linked_list_t *vips)
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{
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return enumerator_create_empty();
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}
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METHOD(eap_radius_provider_t, add_framed_ip, void,
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private_eap_radius_provider_t *this, identification_t *id, host_t *ip)
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{
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this->listener.mutex->lock(this->listener.mutex);
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add_addr(this, this->listener.unclaimed, id, ip);
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this->listener.mutex->unlock(this->listener.mutex);
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}
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METHOD(eap_radius_provider_t, destroy, void,
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private_eap_radius_provider_t *this)
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{
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singleton = NULL;
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charon->bus->remove_listener(charon->bus, &this->listener.public);
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this->listener.mutex->destroy(this->listener.mutex);
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this->listener.claimed->destroy(this->listener.claimed);
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this->listener.unclaimed->destroy(this->listener.unclaimed);
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free(this);
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}
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/**
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* See header
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*/
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eap_radius_provider_t *eap_radius_provider_create()
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{
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if (!singleton)
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{
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private_eap_radius_provider_t *this;
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INIT(this,
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.public = {
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.provider = {
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.acquire_address = _acquire_address,
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.release_address = _release_address,
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.create_attribute_enumerator = _create_attribute_enumerator,
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},
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.add_framed_ip = _add_framed_ip,
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.destroy = _destroy,
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},
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.listener = {
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.public = {
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.ike_updown = _ike_updown,
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.message = _message_hook,
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},
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.claimed = hashtable_create((hashtable_hash_t)hash,
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(hashtable_equals_t)equals, 32),
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.unclaimed = hashtable_create((hashtable_hash_t)hash,
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(hashtable_equals_t)equals, 32),
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.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
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},
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);
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charon->bus->add_listener(charon->bus, &this->listener.public);
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singleton = &this->public;
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}
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return singleton;
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}
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/**
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* See header
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*/
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eap_radius_provider_t *eap_radius_provider_get()
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{
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return singleton;
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}
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