eap-radius: Forward UNITY_SPLIT_INCLUDE or UNITY_LOCAL_LAN attributes
authorTobias Brunner <tobias@strongswan.org>
Fri, 16 Aug 2013 13:25:33 +0000 (15:25 +0200)
committerTobias Brunner <tobias@strongswan.org>
Fri, 11 Oct 2013 13:52:22 +0000 (15:52 +0200)
Depending on the value of the CVPN3000-IPSec-Split-Tunneling-Policy(55)
radius attribute, the subnets in the CVPN3000-IPSec-Split-Tunnel-List(27)
attribute are sent in either a UNITY_SPLIT_INCLUDE (if the value is 1)
or a UNITY_LOCAL_LAN (if the value is 2).

So if the following attributes would be configured for a RADIUS user

  CVPN3000-IPSec-Split-Tunnel-List := "10.0.1.0/255.255.255.0,10.0.2.0/255.255.255.0"
  CVPN3000-IPSec-Split-Tunneling-Policy := 1

A UNITY_SPLIT_INCLUDE configuration payload containing these two subnets
would be sent to the client during the ModeCfg exchange.

src/libcharon/plugins/eap_radius/eap_radius.c

index 469c2a3..9a242c0 100644 (file)
@@ -21,6 +21,7 @@
 
 #include <radius_message.h>
 #include <radius_client.h>
+#include <bio/bio_writer.h>
 
 #include <daemon.h>
 
@@ -413,6 +414,64 @@ static void add_unity_attribute(eap_radius_provider_t *provider, u_int32_t id,
 }
 
 /**
+ * Add a UNITY_LOCAL_LAN or UNITY_SPLIT_INCLUDE attribute
+ */
+static void add_unity_split_attribute(eap_radius_provider_t *provider,
+                                                       u_int32_t id, configuration_attribute_type_t type,
+                                                       chunk_t data)
+{
+       enumerator_t *enumerator;
+       bio_writer_t *writer;
+       char buffer[256], *token, *slash;
+
+       if (snprintf(buffer, sizeof(buffer), "%.*s", (int)data.len,
+                                data.ptr) >= sizeof(buffer))
+       {
+               return;
+       }
+       writer = bio_writer_create(16); /* two IPv4 addresses and 6 bytes padding */
+       enumerator = enumerator_create_token(buffer, ",", " ");
+       while (enumerator->enumerate(enumerator, &token))
+       {
+               host_t *net, *mask = NULL;
+               chunk_t padding;
+
+               slash = strchr(token, '/');
+               if (slash)
+               {
+                       *slash++ = '\0';
+                       mask = host_create_from_string(slash, 0);
+               }
+               if (!mask)
+               {       /* default to /32 */
+                       mask = host_create_from_string("255.255.255.255", 0);
+               }
+               net = host_create_from_string(token, 0);
+               if (!net || net->get_family(net) != AF_INET ||
+                        mask->get_family(mask) != AF_INET)
+               {
+                       mask->destroy(mask);
+                       DESTROY_IF(net);
+                       continue;
+               }
+               writer->write_data(writer, net->get_address(net));
+               writer->write_data(writer, mask->get_address(mask));
+               padding = writer->skip(writer, 6); /* 6 bytes pdding */
+               memset(padding.ptr, 0, padding.len);
+               mask->destroy(mask);
+               net->destroy(net);
+       }
+       enumerator->destroy(enumerator);
+
+       data = writer->get_buf(writer);
+       if (data.len)
+       {
+               provider->add_attribute(provider, id, type, data);
+       }
+       writer->destroy(writer);
+}
+
+/**
  * Handle Framed-IP-Address and other IKE configuration attributes
  */
 static void process_cfg_attributes(radius_message_t *msg)
@@ -422,6 +481,7 @@ static void process_cfg_attributes(radius_message_t *msg)
        ike_sa_t *ike_sa;
        host_t *host;
        chunk_t data;
+       configuration_attribute_type_t split_type = 0;
        int type, vendor;
 
        ike_sa = charon->bus->get_sa(charon->bus);
@@ -460,12 +520,45 @@ static void process_cfg_attributes(radius_message_t *msg)
                                                                        ike_sa->get_unique_id(ike_sa), type, data);
                                                }
                                                break;
+                                       case 55: /* CVPN3000-IPSec-Split-Tunneling-Policy */
+                                               if (data.len)
+                                               {
+                                                       switch (data.ptr[data.len - 1])
+                                                       {
+                                                               case 0: /* tunnelall */
+                                                               default:
+                                                                       break;
+                                                               case 1: /* tunnelspecified */
+                                                                       split_type = UNITY_SPLIT_INCLUDE;
+                                                                       break;
+                                                               case 2: /* excludespecified */
+                                                                       split_type = UNITY_LOCAL_LAN;
+                                                                       break;
+                                                       }
+                                               }
+                                               break;
                                        default:
                                                break;
                                }
                        }
                }
                enumerator->destroy(enumerator);
+
+               if (split_type != 0 &&
+                       ike_sa->supports_extension(ike_sa, EXT_CISCO_UNITY))
+               {
+                       enumerator = msg->create_vendor_enumerator(msg);
+                       while (enumerator->enumerate(enumerator, &vendor, &type, &data))
+                       {
+                               if (vendor == PEN_ALTIGA /* aka Cisco VPN3000 */ &&
+                                       type == 27 /* CVPN3000-IPSec-Split-Tunnel-List */)
+                               {
+                                       add_unity_split_attribute(provider,
+                                                       ike_sa->get_unique_id(ike_sa), split_type, data);
+                               }
+                       }
+                       enumerator->destroy(enumerator);
+               }
        }
 }