summaryrefslogtreecommitdiff
path: root/src/libcharon/sa/tasks/ike_config.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libcharon/sa/tasks/ike_config.c')
-rw-r--r--src/libcharon/sa/tasks/ike_config.c448
1 files changed, 448 insertions, 0 deletions
diff --git a/src/libcharon/sa/tasks/ike_config.c b/src/libcharon/sa/tasks/ike_config.c
new file mode 100644
index 000000000..58bcf0762
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_config.c
@@ -0,0 +1,448 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_config.h"
+
+#include <daemon.h>
+#include <hydra.h>
+#include <encoding/payloads/cp_payload.h>
+
+typedef struct private_ike_config_t private_ike_config_t;
+
+/**
+ * Private members of a ike_config_t task.
+ */
+struct private_ike_config_t {
+
+ /**
+ * Public methods and task_t interface.
+ */
+ ike_config_t public;
+
+ /**
+ * Assigned IKE_SA.
+ */
+ ike_sa_t *ike_sa;
+
+ /**
+ * Are we the initiator?
+ */
+ bool initiator;
+
+ /**
+ * virtual ip
+ */
+ host_t *virtual_ip;
+
+ /**
+ * list of attributes requested and its handler, entry_t
+ */
+ linked_list_t *requested;
+};
+
+/**
+ * Entry for a requested attribute and the requesting handler
+ */
+typedef struct {
+ /** attribute requested */
+ configuration_attribute_type_t type;
+ /** handler requesting this attribute */
+ attribute_handler_t *handler;
+} entry_t;
+
+/**
+ * build INTERNAL_IPV4/6_ADDRESS attribute from virtual ip
+ */
+static configuration_attribute_t *build_vip(host_t *vip)
+{
+ configuration_attribute_type_t type;
+ chunk_t chunk, prefix;
+
+ if (vip->get_family(vip) == AF_INET)
+ {
+ type = INTERNAL_IP4_ADDRESS;
+ if (vip->is_anyaddr(vip))
+ {
+ chunk = chunk_empty;
+ }
+ else
+ {
+ chunk = vip->get_address(vip);
+ }
+ }
+ else
+ {
+ type = INTERNAL_IP6_ADDRESS;
+ if (vip->is_anyaddr(vip))
+ {
+ chunk = chunk_empty;
+ }
+ else
+ {
+ prefix = chunk_alloca(1);
+ *prefix.ptr = 64;
+ chunk = vip->get_address(vip);
+ chunk = chunk_cata("cc", chunk, prefix);
+ }
+ }
+ return configuration_attribute_create_value(type, chunk);
+}
+
+/**
+ * Handle a received attribute as initiator
+ */
+static void handle_attribute(private_ike_config_t *this,
+ configuration_attribute_t *ca)
+{
+ attribute_handler_t *handler = NULL;
+ enumerator_t *enumerator;
+ entry_t *entry;
+
+ /* find the handler which requested this attribute */
+ enumerator = this->requested->create_enumerator(this->requested);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->type == ca->get_type(ca))
+ {
+ handler = entry->handler;
+ this->requested->remove_at(this->requested, enumerator);
+ free(entry);
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ /* and pass it to the handle function */
+ handler = hydra->attributes->handle(hydra->attributes,
+ this->ike_sa->get_other_id(this->ike_sa), handler,
+ ca->get_type(ca), ca->get_value(ca));
+ if (handler)
+ {
+ this->ike_sa->add_configuration_attribute(this->ike_sa,
+ handler, ca->get_type(ca), ca->get_value(ca));
+ }
+}
+
+/**
+ * process a single configuration attribute
+ */
+static void process_attribute(private_ike_config_t *this,
+ configuration_attribute_t *ca)
+{
+ host_t *ip;
+ chunk_t addr;
+ int family = AF_INET6;
+
+ switch (ca->get_type(ca))
+ {
+ case INTERNAL_IP4_ADDRESS:
+ family = AF_INET;
+ /* fall */
+ case INTERNAL_IP6_ADDRESS:
+ {
+ addr = ca->get_value(ca);
+ if (addr.len == 0)
+ {
+ ip = host_create_any(family);
+ }
+ else
+ {
+ /* skip prefix byte in IPv6 payload*/
+ if (family == AF_INET6)
+ {
+ addr.len--;
+ }
+ ip = host_create_from_chunk(family, addr, 0);
+ }
+ if (ip)
+ {
+ DESTROY_IF(this->virtual_ip);
+ this->virtual_ip = ip;
+ }
+ break;
+ }
+ default:
+ {
+ if (this->initiator)
+ {
+ handle_attribute(this, ca);
+ }
+ }
+ }
+}
+
+/**
+ * Scan for configuration payloads and attributes
+ */
+static void process_payloads(private_ike_config_t *this, message_t *message)
+{
+ enumerator_t *enumerator, *attributes;
+ payload_t *payload;
+
+ enumerator = message->create_payload_enumerator(message);
+ while (enumerator->enumerate(enumerator, &payload))
+ {
+ if (payload->get_type(payload) == CONFIGURATION)
+ {
+ cp_payload_t *cp = (cp_payload_t*)payload;
+ configuration_attribute_t *ca;
+
+ switch (cp->get_type(cp))
+ {
+ case CFG_REQUEST:
+ case CFG_REPLY:
+ {
+ attributes = cp->create_attribute_enumerator(cp);
+ while (attributes->enumerate(attributes, &ca))
+ {
+ DBG2(DBG_IKE, "processing %N attribute",
+ configuration_attribute_type_names, ca->get_type(ca));
+ process_attribute(this, ca);
+ }
+ attributes->destroy(attributes);
+ break;
+ }
+ default:
+ DBG1(DBG_IKE, "ignoring %N config payload",
+ config_type_names, cp->get_type(cp));
+ break;
+ }
+ }
+ }
+ enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_config_t *this, message_t *message)
+{
+ if (message->get_message_id(message) == 1)
+ { /* in first IKE_AUTH only */
+ cp_payload_t *cp = NULL;
+ enumerator_t *enumerator;
+ attribute_handler_t *handler;
+ peer_cfg_t *config;
+ configuration_attribute_type_t type;
+ chunk_t data;
+ host_t *vip;
+
+ /* reuse virtual IP if we already have one */
+ vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
+ if (!vip)
+ {
+ config = this->ike_sa->get_peer_cfg(this->ike_sa);
+ vip = config->get_virtual_ip(config);
+ }
+ if (vip)
+ {
+ cp = cp_payload_create_type(CFG_REQUEST);
+ cp->add_attribute(cp, build_vip(vip));
+ }
+
+ enumerator = hydra->attributes->create_initiator_enumerator(hydra->attributes,
+ this->ike_sa->get_other_id(this->ike_sa), vip);
+ while (enumerator->enumerate(enumerator, &handler, &type, &data))
+ {
+ configuration_attribute_t *ca;
+ entry_t *entry;
+
+ /* create configuration attribute */
+ DBG2(DBG_IKE, "building %N attribute",
+ configuration_attribute_type_names, type);
+ ca = configuration_attribute_create_value(type, data);
+ if (!cp)
+ {
+ cp = cp_payload_create_type(CFG_REQUEST);
+ }
+ cp->add_attribute(cp, ca);
+
+ /* save handler along with requested type */
+ entry = malloc_thing(entry_t);
+ entry->type = type;
+ entry->handler = handler;
+
+ this->requested->insert_last(this->requested, entry);
+ }
+ enumerator->destroy(enumerator);
+
+ if (cp)
+ {
+ message->add_payload(message, (payload_t*)cp);
+ }
+ }
+ return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_config_t *this, message_t *message)
+{
+ if (message->get_message_id(message) == 1)
+ { /* in first IKE_AUTH only */
+ process_payloads(this, message);
+ }
+ return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_config_t *this, message_t *message)
+{
+ if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+ { /* in last IKE_AUTH exchange */
+ enumerator_t *enumerator;
+ configuration_attribute_type_t type;
+ chunk_t value;
+ host_t *vip = NULL;
+ cp_payload_t *cp = NULL;
+ peer_cfg_t *config;
+ identification_t *id;
+
+ id = this->ike_sa->get_other_eap_id(this->ike_sa);
+
+ config = this->ike_sa->get_peer_cfg(this->ike_sa);
+ if (config && this->virtual_ip)
+ {
+ DBG1(DBG_IKE, "peer requested virtual IP %H", this->virtual_ip);
+ if (config->get_pool(config))
+ {
+ vip = hydra->attributes->acquire_address(hydra->attributes,
+ config->get_pool(config), id, this->virtual_ip);
+ }
+ if (vip == NULL)
+ {
+ DBG1(DBG_IKE, "no virtual IP found, sending %N",
+ notify_type_names, INTERNAL_ADDRESS_FAILURE);
+ message->add_notify(message, FALSE, INTERNAL_ADDRESS_FAILURE,
+ chunk_empty);
+ return SUCCESS;
+ }
+ DBG1(DBG_IKE, "assigning virtual IP %H to peer", vip);
+ this->ike_sa->set_virtual_ip(this->ike_sa, FALSE, vip);
+
+ cp = cp_payload_create_type(CFG_REPLY);
+ cp->add_attribute(cp, build_vip(vip));
+ }
+
+ /* query registered providers for additional attributes to include */
+ enumerator = hydra->attributes->create_responder_enumerator(
+ hydra->attributes, id, vip);
+ while (enumerator->enumerate(enumerator, &type, &value))
+ {
+ if (!cp)
+ {
+ cp = cp_payload_create_type(CFG_REPLY);
+ }
+ DBG2(DBG_IKE, "building %N attribute",
+ configuration_attribute_type_names, type);
+ cp->add_attribute(cp,
+ configuration_attribute_create_value(type, value));
+ }
+ enumerator->destroy(enumerator);
+
+ if (cp)
+ {
+ message->add_payload(message, (payload_t*)cp);
+ }
+ DESTROY_IF(vip);
+ return SUCCESS;
+ }
+ return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_config_t *this, message_t *message)
+{
+ if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+ { /* in last IKE_AUTH exchange */
+
+ process_payloads(this, message);
+
+ if (this->virtual_ip)
+ {
+ this->ike_sa->set_virtual_ip(this->ike_sa, TRUE, this->virtual_ip);
+ }
+ return SUCCESS;
+ }
+ return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_config_t *this)
+{
+ return IKE_CONFIG;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_config_t *this, ike_sa_t *ike_sa)
+{
+ DESTROY_IF(this->virtual_ip);
+
+ this->ike_sa = ike_sa;
+ this->virtual_ip = NULL;
+ this->requested->destroy_function(this->requested, free);
+ this->requested = linked_list_create();
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_config_t *this)
+{
+ DESTROY_IF(this->virtual_ip);
+ this->requested->destroy_function(this->requested, free);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_config_t *ike_config_create(ike_sa_t *ike_sa, bool initiator)
+{
+ private_ike_config_t *this = malloc_thing(private_ike_config_t);
+
+ this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+ this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+ this->public.task.destroy = (void(*)(task_t*))destroy;
+
+ this->initiator = initiator;
+ this->ike_sa = ike_sa;
+ this->virtual_ip = NULL;
+ this->requested = linked_list_create();
+
+ if (initiator)
+ {
+ this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+ this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+ }
+ else
+ {
+ this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+ this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+ }
+
+ return &this->public;
+}
+