eap-radius: Forward RAT_FRAMED_IP_NETMASK as INTERNAL_IP4_NETMASK
[strongswan.git] / src / libcharon / plugins / eap_radius / eap_radius.c
index d62bcd7..6087a52 100644 (file)
  */
 
 #include "eap_radius.h"
+#include "eap_radius_plugin.h"
 #include "eap_radius_forward.h"
+#include "eap_radius_provider.h"
+#include "eap_radius_accounting.h"
 
-#include "radius_message.h"
-#include "radius_client.h"
+#include <radius_message.h>
+#include <radius_client.h>
+#include <bio/bio_writer.h>
 
 #include <daemon.h>
 
-#define TUNNEL_TYPE_ESP                9
-
 typedef struct private_eap_radius_t private_eap_radius_t;
 
 /**
@@ -74,16 +76,6 @@ struct private_eap_radius_t {
         * Prefix to prepend to EAP identity
         */
        char *id_prefix;
-
-       /**
-        * Handle the Class attribute as group membership information?
-        */
-       bool class_group;
-
-       /**
-        * Handle the Filter-Id attribute as IPsec CHILD_SA name?
-        */
-       bool filter_id;
 };
 
 /**
@@ -156,17 +148,86 @@ static bool radius2ike(private_eap_radius_t *this,
        return FALSE;
 }
 
+/**
+ * See header.
+ */
+void eap_radius_build_attributes(radius_message_t *request)
+{
+       ike_sa_t *ike_sa;
+       host_t *host;
+       char buf[40], *station_id_fmt;;
+       u_int32_t value;
+       chunk_t chunk;
+
+       /* virtual NAS-Port-Type */
+       value = htonl(5);
+       request->add(request, RAT_NAS_PORT_TYPE, chunk_from_thing(value));
+       /* framed ServiceType */
+       value = htonl(2);
+       request->add(request, RAT_SERVICE_TYPE, chunk_from_thing(value));
+
+       ike_sa = charon->bus->get_sa(charon->bus);
+       if (ike_sa)
+       {
+               value = htonl(ike_sa->get_unique_id(ike_sa));
+               request->add(request, RAT_NAS_PORT, chunk_from_thing(value));
+               request->add(request, RAT_NAS_PORT_ID,
+                                        chunk_from_str(ike_sa->get_name(ike_sa)));
+
+               host = ike_sa->get_my_host(ike_sa);
+               chunk = host->get_address(host);
+               switch (host->get_family(host))
+               {
+                       case AF_INET:
+                               request->add(request, RAT_NAS_IP_ADDRESS, chunk);
+                               break;
+                       case AF_INET6:
+                               request->add(request, RAT_NAS_IPV6_ADDRESS, chunk);
+                       default:
+                               break;
+               }
+               if (lib->settings->get_bool(lib->settings,
+                                                                       "%s.plugins.eap-radius.station_id_with_port",
+                                                                       TRUE, charon->name))
+               {
+                       station_id_fmt = "%#H";
+               }
+               else
+               {
+                       station_id_fmt = "%H";
+               }
+               snprintf(buf, sizeof(buf), station_id_fmt, host);
+               request->add(request, RAT_CALLED_STATION_ID, chunk_from_str(buf));
+               host = ike_sa->get_other_host(ike_sa);
+               snprintf(buf, sizeof(buf), station_id_fmt, host);
+               request->add(request, RAT_CALLING_STATION_ID, chunk_from_str(buf));
+       }
+}
+
+/**
+ * Add a set of RADIUS attributes to a request message
+ */
+static void add_radius_request_attrs(private_eap_radius_t *this,
+                                                                        radius_message_t *request)
+{
+       chunk_t chunk;
+
+       chunk = chunk_from_str(this->id_prefix);
+       chunk = chunk_cata("cc", chunk, this->peer->get_encoding(this->peer));
+       request->add(request, RAT_USER_NAME, chunk);
+
+       eap_radius_build_attributes(request);
+       eap_radius_forward_from_ike(request);
+}
+
 METHOD(eap_method_t, initiate, status_t,
        private_eap_radius_t *this, eap_payload_t **out)
 {
        radius_message_t *request, *response;
        status_t status = FAILED;
-       chunk_t username;
 
        request = radius_message_create(RMC_ACCESS_REQUEST);
-       username = chunk_create(this->id_prefix, strlen(this->id_prefix));
-       username = chunk_cata("cc", username, this->peer->get_encoding(this->peer));
-       request->add(request, RAT_USER_NAME, username);
+       add_radius_request_attrs(this, request);
 
        if (this->eap_start)
        {
@@ -176,18 +237,35 @@ METHOD(eap_method_t, initiate, status_t,
        {
                add_eap_identity(this, request);
        }
-       eap_radius_forward_from_ike(request);
 
        response = this->client->request(this->client, request);
        if (response)
        {
                eap_radius_forward_to_ike(response);
-               if (radius2ike(this, response, out))
+               switch (response->get_code(response))
                {
-                       status = NEED_MORE;
+                       case RMC_ACCESS_CHALLENGE:
+                               if (radius2ike(this, response, out))
+                               {
+                                       status = NEED_MORE;
+                               }
+                               break;
+                       case RMC_ACCESS_ACCEPT:
+                               /* Microsoft RADIUS servers can run in a mode where they respond
+                                * like this on the first request (i.e. without authentication),
+                                * we treat this as Access-Reject */
+                       case RMC_ACCESS_REJECT:
+                       default:
+                               DBG1(DBG_IKE, "RADIUS authentication of '%Y' failed",
+                                        this->peer);
+                               break;
                }
                response->destroy(response);
        }
+       else
+       {
+               eap_radius_handle_timeout(NULL);
+       }
        request->destroy(request);
        return status;
 }
@@ -195,7 +273,7 @@ METHOD(eap_method_t, initiate, status_t,
 /**
  * Handle the Class attribute as group membership information
  */
-static void process_class(private_eap_radius_t *this, radius_message_t *msg)
+static void process_class(radius_message_t *msg)
 {
        enumerator_t *enumerator;
        chunk_t data;
@@ -232,7 +310,7 @@ static void process_class(private_eap_radius_t *this, radius_message_t *msg)
 /**
  * Handle the Filter-Id attribute as IPsec CHILD_SA name
  */
-static void process_filter_id(private_eap_radius_t *this, radius_message_t *msg)
+static void process_filter_id(radius_message_t *msg)
 {
        enumerator_t *enumerator;
        int type;
@@ -256,12 +334,12 @@ static void process_filter_id(private_eap_radius_t *this, radius_message_t *msg)
                                tunnel_type = untoh32(data.ptr);
                                DBG1(DBG_IKE, "received RADIUS attribute Tunnel-Type: "
                                                          "tag = %u, value = %u", tunnel_tag, tunnel_type);
-                               is_esp_tunnel = (tunnel_type == TUNNEL_TYPE_ESP);
+                               is_esp_tunnel = (tunnel_type == RADIUS_TUNNEL_TYPE_ESP);
                                break;
                        case RAT_FILTER_ID:
                                filter_id = data;
                                DBG1(DBG_IKE, "received RADIUS attribute Filter-Id: "
-                                                         "'%.*s'", filter_id.len, filter_id.ptr);
+                                                         "'%.*s'", (int)filter_id.len, filter_id.ptr);
                                break;
                        default:
                                break;
@@ -286,28 +364,226 @@ static void process_filter_id(private_eap_radius_t *this, radius_message_t *msg)
 }
 
 /**
- * Handle Session-Timeout attribte
+ * Handle Session-Timeout attribte and Interim updates
  */
-static void process_timeout(private_eap_radius_t *this, radius_message_t *msg)
+static void process_timeout(radius_message_t *msg)
 {
        enumerator_t *enumerator;
        ike_sa_t *ike_sa;
        chunk_t data;
        int type;
 
-       enumerator = msg->create_enumerator(msg);
-       while (enumerator->enumerate(enumerator, &type, &data))
+       ike_sa = charon->bus->get_sa(charon->bus);
+       if (ike_sa)
        {
-               if (type == RAT_SESSION_TIMEOUT && data.len == 4)
+               enumerator = msg->create_enumerator(msg);
+               while (enumerator->enumerate(enumerator, &type, &data))
                {
-                       ike_sa = charon->bus->get_sa(charon->bus);
-                       if (ike_sa)
+                       if (type == RAT_SESSION_TIMEOUT && data.len == 4)
                        {
                                ike_sa->set_auth_lifetime(ike_sa, untoh32(data.ptr));
                        }
+                       else if (type == RAT_ACCT_INTERIM_INTERVAL && data.len == 4)
+                       {
+                               eap_radius_accounting_start_interim(ike_sa, untoh32(data.ptr));
+                       }
+               }
+               enumerator->destroy(enumerator);
+       }
+}
+
+/**
+ * Add a Cisco Unity configuration attribute
+ */
+static void add_unity_attribute(eap_radius_provider_t *provider, u_int32_t id,
+                                                               int type, chunk_t data)
+{
+       switch (type)
+       {
+               case 15: /* CVPN3000-IPSec-Banner1 */
+               case 36: /* CVPN3000-IPSec-Banner2 */
+                       provider->add_attribute(provider, id, UNITY_BANNER, data);
+                       break;
+               case 28: /* CVPN3000-IPSec-Default-Domain */
+                       provider->add_attribute(provider, id, UNITY_DEF_DOMAIN, data);
+                       break;
+               case 29: /* CVPN3000-IPSec-Split-DNS-Names */
+                       provider->add_attribute(provider, id, UNITY_SPLITDNS_NAME, data);
+                       break;
+       }
+}
+
+/**
+ * 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)
+{
+       eap_radius_provider_t *provider;
+       enumerator_t *enumerator;
+       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);
+       provider = eap_radius_provider_get();
+       if (provider && ike_sa)
+       {
+               enumerator = msg->create_enumerator(msg);
+               while (enumerator->enumerate(enumerator, &type, &data))
+               {
+                       if (type == RAT_FRAMED_IP_ADDRESS && data.len == 4)
+                       {
+                               host = host_create_from_chunk(AF_INET, data, 0);
+                               if (host)
+                               {
+                                       provider->add_framed_ip(provider,
+                                                                       ike_sa->get_unique_id(ike_sa), host);
+                               }
+                       }
+                       else if (type == RAT_FRAMED_IP_NETMASK && data.len == 4)
+                       {
+                               provider->add_attribute(provider, ike_sa->get_unique_id(ike_sa),
+                                                                               INTERNAL_IP4_NETMASK, data);
+                       }
+               }
+               enumerator->destroy(enumerator);
+
+               enumerator = msg->create_vendor_enumerator(msg);
+               while (enumerator->enumerate(enumerator, &vendor, &type, &data))
+               {
+                       if (vendor == PEN_ALTIGA /* aka Cisco VPN3000 */)
+                       {
+                               switch (type)
+                               {
+                                       case 15: /* CVPN3000-IPSec-Banner1 */
+                                       case 28: /* CVPN3000-IPSec-Default-Domain */
+                                       case 29: /* CVPN3000-IPSec-Split-DNS-Names */
+                                       case 36: /* CVPN3000-IPSec-Banner2 */
+                                               if (ike_sa->supports_extension(ike_sa, EXT_CISCO_UNITY))
+                                               {
+                                                       add_unity_attribute(provider,
+                                                                       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);
+               }
+       }
+}
+
+/**
+ * See header.
+ */
+void eap_radius_process_attributes(radius_message_t *message)
+{
+       if (lib->settings->get_bool(lib->settings,
+                                       "%s.plugins.eap-radius.class_group", FALSE, charon->name))
+       {
+               process_class(message);
+       }
+       if (lib->settings->get_bool(lib->settings,
+                                       "%s.plugins.eap-radius.filter_id", FALSE, charon->name))
+       {
+               process_filter_id(message);
+       }
+       process_timeout(message);
+       process_cfg_attributes(message);
 }
 
 METHOD(eap_method_t, process, status_t,
@@ -318,19 +594,20 @@ METHOD(eap_method_t, process, status_t,
        chunk_t data;
 
        request = radius_message_create(RMC_ACCESS_REQUEST);
-       request->add(request, RAT_USER_NAME, this->peer->get_encoding(this->peer));
+       add_radius_request_attrs(this, request);
+
        data = in->get_data(in);
        DBG3(DBG_IKE, "%N payload %B", eap_type_names, this->type, &data);
 
-       /* fragment data suitable for RADIUS (not more than 253 bytes) */
-       while (data.len > 253)
+       /* fragment data suitable for RADIUS */
+       while (data.len > MAX_RADIUS_ATTRIBUTE_SIZE)
        {
-               request->add(request, RAT_EAP_MESSAGE, chunk_create(data.ptr, 253));
-               data = chunk_skip(data, 253);
+               request->add(request, RAT_EAP_MESSAGE,
+                                        chunk_create(data.ptr,MAX_RADIUS_ATTRIBUTE_SIZE));
+               data = chunk_skip(data, MAX_RADIUS_ATTRIBUTE_SIZE);
        }
        request->add(request, RAT_EAP_MESSAGE, data);
 
-       eap_radius_forward_from_ike(request);
        response = this->client->request(this->client, request);
        if (response)
        {
@@ -346,22 +623,15 @@ METHOD(eap_method_t, process, status_t,
                                status = FAILED;
                                break;
                        case RMC_ACCESS_ACCEPT:
-                               if (this->class_group)
-                               {
-                                       process_class(this, response);
-                               }
-                               if (this->filter_id)
-                               {
-                                       process_filter_id(this, response);
-                               }
-                               process_timeout(this, response);
+                               eap_radius_process_attributes(response);
                                DBG1(DBG_IKE, "RADIUS authentication of '%Y' successful",
                                         this->peer);
                                status = SUCCESS;
                                break;
                        case RMC_ACCESS_REJECT:
                        default:
-                               DBG1(DBG_IKE, "RADIUS authentication of '%Y' failed", this->peer);
+                               DBG1(DBG_IKE, "RADIUS authentication of '%Y' failed",
+                                        this->peer);
                                status = FAILED;
                                break;
                }
@@ -449,16 +719,13 @@ eap_radius_t *eap_radius_create(identification_t *server, identification_t *peer
                /* initially EAP_RADIUS, but is set to the method selected by RADIUS */
                .type = EAP_RADIUS,
                .eap_start = lib->settings->get_bool(lib->settings,
-                                                               "charon.plugins.eap-radius.eap_start", FALSE),
+                                                                       "%s.plugins.eap-radius.eap_start", FALSE,
+                                                                       charon->name),
                .id_prefix = lib->settings->get_str(lib->settings,
-                                                               "charon.plugins.eap-radius.id_prefix", ""),
-               .class_group = lib->settings->get_bool(lib->settings,
-                                                               "charon.plugins.eap-radius.class_group", FALSE),
-               .filter_id = lib->settings->get_bool(lib->settings,
-                                                               "charon.plugins.eap-radius.filter_id", FALSE),
-
+                                                                       "%s.plugins.eap-radius.id_prefix", "",
+                                                                       charon->name),
        );
-       this->client = radius_client_create();
+       this->client = eap_radius_create_client();
        if (!this->client)
        {
                free(this);
@@ -468,4 +735,3 @@ eap_radius_t *eap_radius_create(identification_t *server, identification_t *peer
        this->server = server->clone(server);
        return &this->public;
 }
-