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authorTobias Brunner <tobias@strongswan.org>2012-08-23 15:00:20 +0200
committerTobias Brunner <tobias@strongswan.org>2012-08-31 11:42:03 +0200
commit3dde55e67b7c58969dc70e3b682bfb467d9a5edc (patch)
tree4388d56c87216be7c7c328ae6fdc15e319486a30
parenta2f1d75eaec862e168b2e1e69f795de3a929b395 (diff)
downloadstrongswan-3dde55e67b7c58969dc70e3b682bfb467d9a5edc.tar.bz2
strongswan-3dde55e67b7c58969dc70e3b682bfb467d9a5edc.tar.xz
eap-dynamic plugin handles EAP-Nak messages and selects a method supported by the peer
-rw-r--r--src/libcharon/plugins/eap_dynamic/eap_dynamic.c73
1 files changed, 72 insertions, 1 deletions
diff --git a/src/libcharon/plugins/eap_dynamic/eap_dynamic.c b/src/libcharon/plugins/eap_dynamic/eap_dynamic.c
index e6705cc39..d4ffe637a 100644
--- a/src/libcharon/plugins/eap_dynamic/eap_dynamic.c
+++ b/src/libcharon/plugins/eap_dynamic/eap_dynamic.c
@@ -46,6 +46,11 @@ struct private_eap_dynamic_t {
linked_list_t *types;
/**
+ * EAP types supported by peer, if any
+ */
+ linked_list_t *other_types;
+
+ /**
* The proxied EAP method
*/
eap_method_t *method;
@@ -85,7 +90,8 @@ static eap_method_t *load_method(private_eap_dynamic_t *this,
}
/**
- * Select the first method we can instantiate
+ * Select the first method we can instantiate and is (optionally) supported
+ * by the client.
*/
static void select_method(private_eap_dynamic_t *this)
{
@@ -93,6 +99,25 @@ static void select_method(private_eap_dynamic_t *this)
while (this->types->remove_first(this->types, (void*)&entry) == SUCCESS)
{
+ if (this->other_types)
+ {
+ if (this->other_types->find_first(this->other_types,
+ (void*)entry_matches, NULL, entry) != SUCCESS)
+ {
+ if (entry->vendor)
+ {
+ DBG2(DBG_IKE, "skip vendor specific EAP method %d-%d not "
+ "supported by peer", entry->type, entry->vendor);
+ }
+ else
+ {
+ DBG2(DBG_IKE, "skip %N method not supported by peer",
+ eap_type_names, entry->type);
+ }
+ free(entry);
+ continue;
+ }
+ }
this->method = load_method(this, entry->type, entry->vendor);
free(entry);
@@ -121,6 +146,51 @@ METHOD(eap_method_t, initiate, status_t,
METHOD(eap_method_t, process, status_t,
private_eap_dynamic_t *this, eap_payload_t *in, eap_payload_t **out)
{
+ eap_type_t received_type, type;
+ u_int32_t received_vendor, vendor;
+
+ received_type = in->get_type(in, &received_vendor);
+ if (received_vendor == 0 && received_type == EAP_NAK)
+ {
+ enumerator_t *enumerator;
+
+ DBG1(DBG_IKE, "received %N", eap_type_names, EAP_NAK);
+ if (this->other_types)
+ { /* we already received a Nak or a proper response before */
+ DBG1(DBG_IKE, "%N is not supported in this state", eap_type_names,
+ EAP_NAK);
+ return FAILED;
+ }
+
+ this->other_types = linked_list_create();
+ enumerator = in->get_types(in);
+ while (enumerator->enumerate(enumerator, &type, &vendor))
+ {
+ eap_vendor_type_t *entry;
+
+ if (!type)
+ {
+ DBG1(DBG_IKE, "peer does not support any other EAP methods");
+ enumerator->destroy(enumerator);
+ return FAILED;
+ }
+ INIT(entry,
+ .type = type,
+ .vendor = vendor,
+ );
+ this->other_types->insert_last(this->other_types, entry);
+ }
+ enumerator->destroy(enumerator);
+
+ /* restart with a different method */
+ this->method->destroy(this->method);
+ this->method = NULL;
+ return initiate(this, out);
+ }
+ if (!this->other_types)
+ { /* so we don't handle EAP-Naks later */
+ this->other_types = linked_list_create();
+ }
if (this->method)
{
return this->method->process(this->method, in, out);
@@ -183,6 +253,7 @@ METHOD(eap_method_t, destroy, void,
{
DESTROY_IF(this->method);
this->types->destroy_function(this->types, (void*)free);
+ DESTROY_FUNCTION_IF(this->other_types, (void*)free);
this->server->destroy(this->server);
this->peer->destroy(this->peer);
free(this);