- New upstream release.

4 files changed, 727 insertions, 147 deletions

diff --git a/src/charon/sa/authenticators/eap/eap_sim.c b/src/charon/sa/authenticators/eap/eap_sim.c
index c9eb5ce8f..90898fb46 100644
--- a/src/charon/sa/authenticators/eap/eap_sim.c
+++ b/src/charon/sa/authenticators/eap/eap_sim.c
@@ -29,6 +29,21 @@
 
 #define MAX_TRIES 3
 
+/* number of triplets for one authentication */
+#define TRIPLET_COUNT 3
+
+typedef enum sim_subtype_t sim_subtype_t;
+
+/**
+ * Subtypes of SIM messages
+ */
+enum sim_subtype_t {
+	SIM_START = 10,
+	SIM_CHALLENGE = 11,
+	SIM_NOTIFICATION = 12,
+	SIM_CLIENT_ERROR = 14,
+};
+
 ENUM(sim_subtype_names, SIM_START, SIM_CLIENT_ERROR,
 	"SIM_START",
 	"SIM_CHALLENGE",
@@ -37,6 +52,40 @@ ENUM(sim_subtype_names, SIM_START, SIM_CLIENT_ERROR,
 	"SIM_CLIENT_ERROR",
 );
 
+typedef enum sim_attribute_t sim_attribute_t;
+
+/**
+ * Attributes in SIM messages
+ */
+enum sim_attribute_t {
+	/** defines the end of attribute list */
+	AT_END = -1,
+	AT_RAND = 1,
+	AT_AUTN = 2,
+	AT_RES = 3,
+	AT_AUTS = 4,
+	AT_PADDING = 6,
+	AT_NONCE_MT = 7,
+	AT_PERMANENT_ID_REQ = 10,
+	AT_MAC = 11,
+	AT_NOTIFICATION = 12,
+	AT_ANY_ID_REQ = 13,
+	AT_IDENTITY = 14,
+	AT_VERSION_LIST = 15,
+	AT_SELECTED_VERSION = 16,
+	AT_FULLAUTH_ID_REQ = 17,
+	AT_COUNTER = 19,
+	AT_COUNTER_TOO_SMALL = 20,
+	AT_NONCE_S = 21,
+	AT_CLIENT_ERROR_CODE = 22,
+	AT_IV = 129,
+	AT_ENCR_DATA = 130,
+	AT_NEXT_PSEUDONYM = 132,
+	AT_NEXT_REAUTH_ID = 133,
+	AT_CHECKCODE = 134,
+	AT_RESULT_IND = 135,
+};
+
 ENUM_BEGIN(sim_attribute_names, AT_END, AT_CLIENT_ERROR_CODE,
 	"AT_END",
 	"AT_0",
@@ -96,6 +145,11 @@ struct private_eap_sim_t {
 	sim_algo_t alg;
 	
 	/**
+	 * libraries get_triplet() function returning a triplet
+	 */
+	sim_get_triplet_t get_triplet;
+	
+	/**
 	 * handle of the loaded library
 	 */
 	void *handle;
@@ -106,6 +160,16 @@ struct private_eap_sim_t {
 	int tries;
 	
 	/**
+	 * unique EAP identifier
+	 */
+	u_int8_t identifier;
+	
+	/**
+	 * EAP message type this role sends
+	 */
+	u_int8_t type;
+	
+	/**
 	 * version this implementation uses
 	 */
 	chunk_t version;
@@ -121,6 +185,11 @@ struct private_eap_sim_t {
 	chunk_t nonce;
 	
 	/**
+	 * concatenated SRES values
+	 */
+	chunk_t sreses;
+	
+	/**
 	 * k_encr key derived from MK
 	 */
 	chunk_t k_encr;
@@ -147,6 +216,10 @@ struct private_eap_sim_t {
 #define MAC_LEN 16
 /** length of the AT_RAND value */
 #define RAND_LEN 16
+/** length of Kc */
+#define KC_LEN 8
+/** length of SRES */
+#define SRES_LEN 4
 /** length of the k_encr key */
 #define KENCR_LEN 16
 /** length of the k_auth key */
@@ -156,6 +229,7 @@ struct private_eap_sim_t {
 /** length of the EMSK */
 #define EMSK_LEN 64
 
+static char version[] = {0x00,0x01};
 /* client error codes used in AT_CLIENT_ERROR_CODE */
 char client_error_general_buf[] = {0x00, 0x01};
 char client_error_unsupported_buf[] = {0x00, 0x02};
@@ -229,7 +303,7 @@ static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier
 	chunk_t mac_data = chunk_empty;
 	
 	/* write EAP header, skip length bytes */
-	*pos.ptr++ = EAP_RESPONSE;
+	*pos.ptr++ = this->type;
 	*pos.ptr++ = identifier;
 	pos.ptr += 2;
 	pos.len -= 4;
@@ -263,6 +337,7 @@ static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier
 				break;
 			}
 			case AT_IDENTITY:
+			case AT_VERSION_LIST:
 			{
 				u_int16_t act_len = data.len;
 				/* align up to four byte */
@@ -346,8 +421,8 @@ static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier
 /**
  * process an EAP-SIM/Request/Start message
  */
-static status_t process_start(private_eap_sim_t *this, eap_payload_t *in,
-							  eap_payload_t **out)
+static status_t peer_process_start(private_eap_sim_t *this, eap_payload_t *in,
+								   eap_payload_t **out)
 {
 	chunk_t message, data;
 	sim_attribute_t attribute, include_id = AT_END;
@@ -440,18 +515,56 @@ static status_t process_start(private_eap_sim_t *this, eap_payload_t *in,
 }
 
 /**
+ * derive EAP keys from kc
+ */
+static void derive_keys(private_eap_sim_t *this, chunk_t kcs)
+{
+	chunk_t tmp, mk;
+	hasher_t *hasher;
+	prf_t *prf;
+	int i;
+
+	/* build MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
+	tmp = chunk_cata("ccccc", this->peer->get_encoding(this->peer), kcs,
+					 this->nonce, this->version_list, this->version);
+	hasher = hasher_create(HASH_SHA1);
+	mk = chunk_alloca(hasher->get_hash_size(hasher));
+	hasher->get_hash(hasher, tmp, mk.ptr);
+	hasher->destroy(hasher);
+	DBG3(DBG_IKE, "MK = SHA1(%B\n) = %B", &tmp, &mk);
+	
+	/* K_encr | K_auth | MSK | EMSK = prf() | prf() | prf() | prf()
+	 * FIPS PRF has 320 bit block size, we need 160 byte for keys
+	 *  => run prf four times */
+	prf = prf_create(PRF_FIPS_SHA1_160);
+	prf->set_key(prf, mk);
+	tmp = chunk_alloca(prf->get_block_size(prf) * 4);
+	for (i = 0; i < 4; i++)
+	{
+		prf->get_bytes(prf, chunk_empty, tmp.ptr + tmp.len / 4 * i);
+	}
+	prf->destroy(prf);
+	chunk_free(&this->k_encr);
+	chunk_free(&this->k_auth);
+	chunk_free(&this->msk);
+	chunk_free(&this->emsk);
+	chunk_split(tmp, "aaaa", KENCR_LEN, &this->k_encr, KAUTH_LEN, &this->k_auth,
+				MSK_LEN, &this->msk, EMSK_LEN, &this->emsk);
+	DBG3(DBG_IKE, "K_encr %B\nK_auth %B\nMSK %B\nEMSK %B",
+		 &this->k_encr, &this->k_auth, &this->msk, &this->emsk);
+}
+
+/**
  * process an EAP-SIM/Request/Challenge message
  */
-static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
-								  eap_payload_t **out)
+static status_t peer_process_challenge(private_eap_sim_t *this,
+									   eap_payload_t *in, eap_payload_t **out)
 {
-	chunk_t message, data, tmp, kcs, kc, sreses, sres, mk;
+	chunk_t message, data, tmp, kcs, kc, sreses, sres;
 	sim_attribute_t attribute;
-	u_int8_t identifier, i;
+	u_int8_t identifier;
 	chunk_t mac = chunk_empty, rands = chunk_empty;
 	signer_t *signer;
-	hasher_t *hasher;
-	prf_t *prf;
 	
 	if (this->tries-- <= 0)
 	{
@@ -541,7 +654,7 @@ static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
 		
 		if (this->alg(rands.ptr, RAND_LEN, sres.ptr, &sres_len, kc.ptr, &kc_len))
 		{
-			DBG1(DBG_IKE, "unable to get triplets from SIM");
+			DBG1(DBG_IKE, "unable to get EAP-SIM triplet");
 			*out = build_payload(this, identifier, SIM_CLIENT_ERROR,
 								 AT_CLIENT_ERROR_CODE, client_error_general,
 								 AT_END);
@@ -554,34 +667,7 @@ static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
 		rands = chunk_skip(rands, RAND_LEN);
 	}
 	
-	/* build MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
-	tmp = chunk_cata("ccccc", this->peer->get_encoding(this->peer), kcs,
-					 this->nonce, this->version_list, this->version);
-	hasher = hasher_create(HASH_SHA1);
-	mk = chunk_alloca(hasher->get_hash_size(hasher));
-	hasher->get_hash(hasher, tmp, mk.ptr);
-	hasher->destroy(hasher);
-	DBG3(DBG_IKE, "MK = SHA1(%B\n) = %B", &tmp, &mk);
-	
-	/* K_encr | K_auth | MSK | EMSK = prf() | prf() | prf() | prf()
-	 * FIPS PRF has 320 bit block size, we need 160 byte for keys
-	 *  => run prf four times */
-	prf = prf_create(PRF_FIPS_SHA1_160);
-	prf->set_key(prf, mk);
-	tmp = chunk_alloca(prf->get_block_size(prf) * 4);
-	for (i = 0; i < 4; i++)
-	{
-		prf->get_bytes(prf, chunk_empty, tmp.ptr + tmp.len / 4 * i);
-	}
-	prf->destroy(prf);
-	chunk_free(&this->k_encr);
-	chunk_free(&this->k_auth);
-	chunk_free(&this->msk);
-	chunk_free(&this->emsk);
-	chunk_split(tmp, "aaaa", KENCR_LEN, &this->k_encr, KAUTH_LEN, &this->k_auth,
-				MSK_LEN, &this->msk, EMSK_LEN, &this->emsk);
-	DBG3(DBG_IKE, "K_encr %B\nK_auth %B\nMSK %B\nEMSK %B",
-		 &this->k_encr, &this->k_auth, &this->msk, &this->emsk);
+	derive_keys(this, kcs);
 	
 	/* verify AT_MAC attribute, signature is over "EAP packet | NONCE_MT"  */
 	signer = signer_create(AUTH_HMAC_SHA1_128);
@@ -606,10 +692,144 @@ static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
 }
 
 /**
+ * process an EAP-SIM/Response/Challenge message
+ */
+static status_t server_process_challenge(private_eap_sim_t *this,
+									     eap_payload_t *in, eap_payload_t **out)
+{
+	chunk_t message, data;
+	sim_attribute_t attribute;
+	chunk_t mac = chunk_empty, tmp;
+	signer_t *signer;
+	
+	message = in->get_data(in);
+	read_header(&message);
+
+	while ((attribute = read_attribute(&message, &data)) != AT_END)
+	{
+		switch (attribute)
+		{
+			case AT_MAC:
+				/* MAC has two reserved bytes */
+				if (data.len == MAC_LEN + 2)
+				{	/* clone and zero MAC for verification */
+					mac = chunk_clonea(chunk_skip(data, 2));
+					memset(data.ptr, 0, data.len);
+				}
+				break;
+			default:
+				DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+					 sim_attribute_names, attribute);
+				break;
+		}
+	}
+	if (!mac.ptr)
+	{
+		DBG1(DBG_IKE, "no valid AT_MAC attribute received");
+		return FAILED;
+	}
+	/* verify AT_MAC attribute, signature is over "EAP packet | n*SRES"  */
+	signer = signer_create(AUTH_HMAC_SHA1_128);
+	signer->set_key(signer, this->k_auth);
+	tmp = chunk_cata("cc", in->get_data(in), this->sreses);
+	if (!signer->verify_signature(signer, tmp, mac))
+	{
+		DBG1(DBG_IKE, "AT_MAC verification failed");
+		signer->destroy(signer);
+		return FAILED;
+	}
+	signer->destroy(signer);
+	return SUCCESS;
+}
+
+/**
+ * process an EAP-SIM/Response/Start message
+ */
+static status_t server_process_start(private_eap_sim_t *this,
+									 eap_payload_t *in, eap_payload_t **out)
+{
+	chunk_t message, data;
+	sim_attribute_t attribute;
+	bool supported = FALSE;
+	chunk_t rands, rand, kcs, kc, sreses, sres;
+	char id[64];
+	int len, i, rand_len, kc_len, sres_len;
+	
+	message = in->get_data(in);
+	read_header(&message);
+
+	while ((attribute = read_attribute(&message, &data)) != AT_END)
+	{
+		switch (attribute)
+		{
+			case AT_NONCE_MT:
+				if (data.len == NONCE_LEN + 2)
+				{
+					this->nonce = chunk_clone(chunk_skip(data, 2));
+				}
+				break;
+			case AT_SELECTED_VERSION:
+				if (chunk_equals(data, this->version))
+				{
+					supported = TRUE;
+				}
+				break;
+			default:
+				DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+					 sim_attribute_names, attribute);
+				break;
+		}
+	}
+	if (!supported || !this->nonce.ptr)
+	{
+		DBG1(DBG_IKE, "received incomplete EAP-SIM/Response/Start");
+		return FAILED;
+	}
+	len = snprintf(id, sizeof(id), "%D", this->peer);
+	if (len > sizeof(id) || len < 0)
+	{
+		return FAILED;
+	}
+	
+	/* read triplets from provider */
+	rand = rands = chunk_alloca(RAND_LEN * TRIPLET_COUNT);
+	kc = kcs = chunk_alloca(KC_LEN * TRIPLET_COUNT);
+	sres = sreses = chunk_alloca(SRES_LEN * TRIPLET_COUNT);
+	rands.len = 0;
+	kcs.len = 0;
+	sreses.len = 0;
+	for (i = 0; i < TRIPLET_COUNT; i++)
+	{
+		rand_len = RAND_LEN;
+		kc_len = KC_LEN;
+		sres_len = SRES_LEN;
+		if (this->get_triplet(id, rand.ptr, &rand_len, sres.ptr, &sres_len,
+							  kc.ptr, &kc_len))
+		{
+			DBG1(DBG_IKE, "getting EAP-SIM triplet %d failed", i);
+			return FAILED;
+		}
+		rands.len += rand_len;
+		kcs.len += kc_len;
+		sreses.len += sres_len;
+		rand = chunk_skip(rand, rand_len);
+		kc = chunk_skip(kc, kc_len);
+		sres = chunk_skip(sres, sres_len);
+	}
+	derive_keys(this, kcs);
+	
+	/* build MAC over "EAP packet | NONCE_MT" */
+	*out = build_payload(this, this->identifier++, SIM_CHALLENGE, AT_RAND,
+						 rands, AT_MAC, this->nonce, AT_END);
+	this->sreses = chunk_clone(sreses);
+	return NEED_MORE;
+}
+
+/**
  * process an EAP-SIM/Request/Notification message
  */
-static status_t process_notification(private_eap_sim_t *this, eap_payload_t *in,
-									 eap_payload_t **out)
+static status_t peer_process_notification(private_eap_sim_t *this,
+										  eap_payload_t *in, eap_payload_t **out)
 {
 	chunk_t message, data;
 	sim_attribute_t attribute;
@@ -656,12 +876,44 @@ static status_t process_notification(private_eap_sim_t *this, eap_payload_t *in,
 	return NEED_MORE;
 }
 
+/**
+ * Process a client error
+ */
+static status_t server_process_client_error(private_eap_sim_t *this,
+											eap_payload_t *in, eap_payload_t **out)
+{
+	chunk_t message, data;
+	sim_attribute_t attribute;
+	
+	message = in->get_data(in);
+	read_header(&message);
+
+	while ((attribute = read_attribute(&message, &data)) != AT_END)
+	{
+		if (attribute == AT_CLIENT_ERROR_CODE)
+		{
+			u_int16_t code = 0;
+			if (data.len == 2)
+			{
+				code = ntohs(*(u_int16_t*)data.ptr);
+			}
+			DBG1(DBG_IKE, "received %N error %d",
+		 		 sim_attribute_names, attribute, code);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+				 sim_attribute_names, attribute);
+		}
+	}
+	return FAILED;
+}
 
 /**
  * Implementation of eap_method_t.process for the peer
  */
-static status_t process(private_eap_sim_t *this,
-						eap_payload_t *in, eap_payload_t **out)
+static status_t peer_process(private_eap_sim_t *this,
+							 eap_payload_t *in, eap_payload_t **out)
 {
 	sim_subtype_t type;
 	chunk_t message;
@@ -672,11 +924,11 @@ static status_t process(private_eap_sim_t *this,
 	switch (type)
 	{
 		case SIM_START:
-			return process_start(this, in, out);
+			return peer_process_start(this, in, out);
 		case SIM_CHALLENGE:
-			return process_challenge(this, in, out);
+			return peer_process_challenge(this, in, out);
 		case SIM_NOTIFICATION:
-			return process_notification(this, in, out);
+			return peer_process_notification(this, in, out);
 		default:
 			DBG1(DBG_IKE, "unable to process EAP_SIM subtype %N",
 				 sim_subtype_names, type);
@@ -687,15 +939,55 @@ static status_t process(private_eap_sim_t *this,
 }
 
 /**
+ * Implementation of eap_method_t.process for the server
+ */
+static status_t server_process(private_eap_sim_t *this,
+							 eap_payload_t *in, eap_payload_t **out)
+{
+	sim_subtype_t type;
+	chunk_t message;
+	
+	message = in->get_data(in);
+	type = read_header(&message);
+	
+	switch (type)
+	{
+		case SIM_START:
+			return server_process_start(this, in, out);
+		case SIM_CHALLENGE:
+			return server_process_challenge(this, in, out);
+		case SIM_CLIENT_ERROR:
+			return server_process_client_error(this, in, out);
+		default:
+			DBG1(DBG_IKE, "unable to process EAP_SIM subtype %N",
+				 sim_subtype_names, type);
+			return FAILED;
+	}
+}
+
+/**
  * Implementation of eap_method_t.initiate for the peer
  */
-static status_t initiate(private_eap_sim_t *this, eap_payload_t **out)
+static status_t peer_initiate(private_eap_sim_t *this, eap_payload_t **out)
 {
 	/* peer never initiates */
 	return FAILED;
 }
 
 /**
+ * Implementation of eap_method_t.initiate for the server
+ */
+static status_t server_initiate(private_eap_sim_t *this, eap_payload_t **out)
+{
+	/* version_list to derive MK, no padding */
+	this->version_list = chunk_clone(this->version);
+	/* build_payloads adds padding itself */
+	*out = build_payload(this, this->identifier++, SIM_START,
+						 AT_VERSION_LIST, this->version, AT_END);
+	return NEED_MORE;
+}
+
+/**
  * Implementation of eap_method_t.get_type.
  */
 static eap_type_t get_type(private_eap_sim_t *this, u_int32_t *vendor)
@@ -732,6 +1024,7 @@ static void destroy(private_eap_sim_t *this)
 {
 	dlclose(this->handle);
 	chunk_free(&this->nonce);
+	chunk_free(&this->sreses);
 	chunk_free(&this->version_list);
 	chunk_free(&this->k_auth);
 	chunk_free(&this->k_encr);
@@ -748,60 +1041,85 @@ eap_sim_t *eap_create(eap_role_t role,
 {
 	private_eap_sim_t *this;
 	randomizer_t *randomizer;
-	static char version[] = {0x00,0x01};
-	
-	if (role != EAP_PEER)
-	{
-		return NULL;
-	}	
-	this = malloc_thing(private_eap_sim_t);
+	void *symbol;
+	char *name;
+  	
+  	this = malloc_thing(private_eap_sim_t);
+	this->alg = NULL;
+	this->get_triplet = NULL;
+	this->nonce = chunk_empty;
+	this->sreses = chunk_empty;
+	this->peer = peer;
+	this->tries = MAX_TRIES;
+	this->version.ptr = version;
+	this->version.len = sizeof(version);
+	this->version_list = chunk_empty;
+	this->k_auth = chunk_empty;
+	this->k_encr = chunk_empty;
+	this->msk = chunk_empty;
+	this->emsk = chunk_empty;
+	this->identifier = random();
 	
 	this->handle = dlopen(SIM_READER_LIB, RTLD_LAZY);
 	if (this->handle == NULL)
 	{
-		DBG1(DBG_IKE, "unable to open SIM reader '%s'", SIM_READER_LIB);		
+		DBG1(DBG_IKE, "unable to open SIM reader '%s'", SIM_READER_LIB);
 		free(this);
 		return NULL;
 	}
-	this->alg = dlsym(this->handle, SIM_READER_ALG);
-	if (this->alg == NULL)
+	switch (role)
 	{
-		DBG1(DBG_IKE, "unable to open SIM reader function '%s' in '%s'",
-			 SIM_READER_ALG, SIM_READER_LIB);
+		case EAP_PEER:
+			name = SIM_READER_ALG;
+			break;
+		case EAP_SERVER:
+			name = SIM_READER_GET_TRIPLET;
+			break;
+		default:	
+			free(this);
+			return NULL;
+	}
+	symbol = dlsym(this->handle, name);
+	if (symbol == NULL)
+	{
+		DBG1(DBG_IKE, "unable to open SIM function '%s' in '%s'",
+			 name, SIM_READER_LIB);
 		dlclose(this->handle);
 		free(this);
 		return NULL;
 	}
-	
-	randomizer = randomizer_create();
-	if (randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_LEN,
-												 &this->nonce))
+	switch (role)
 	{
-		DBG1(DBG_IKE, "unable to generate NONCE for EAP_SIM");		
-		randomizer->destroy(randomizer);
-		free(this);
-		return NULL;
+		case EAP_SERVER:
+			this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))server_initiate;
+			this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))server_process;
+			this->get_triplet = symbol;
+			this->type = EAP_REQUEST;
+			break;
+		case EAP_PEER:
+			this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))peer_initiate;
+			this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))peer_process;
+			this->alg = symbol;
+			this->type = EAP_RESPONSE;
+			randomizer = randomizer_create();
+			if (randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_LEN,
+														 &this->nonce))
+			{
+				DBG1(DBG_IKE, "unable to generate NONCE for EAP_SIM");		
+				randomizer->destroy(randomizer);
+				free(this);
+				return NULL;
+			}
+			randomizer->destroy(randomizer);
+ 			break;
+		default:
+			free(this);
+			return NULL;
 	}
-	randomizer->destroy(randomizer);
-	
-	/* public functions */
-	this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate;
-	this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process;
 	this->public.eap_method_interface.get_type = (eap_type_t(*)(eap_method_t*,u_int32_t*))get_type;
 	this->public.eap_method_interface.is_mutual = (bool(*)(eap_method_t*))is_mutual;
 	this->public.eap_method_interface.get_msk = (status_t(*)(eap_method_t*,chunk_t*))get_msk;
 	this->public.eap_method_interface.destroy = (void(*)(eap_method_t*))destroy;
 	
-	/* private data */
-	this->peer = peer;
-	this->tries = MAX_TRIES;
-	this->version.ptr = version;
-	this->version.len = sizeof(version);
-	this->version_list = chunk_empty;
-	this->k_auth = chunk_empty;
-	this->k_encr = chunk_empty;
-	this->msk = chunk_empty;
-	this->emsk = chunk_empty;
-	
 	return &this->public;
 }
diff --git a/src/charon/sa/authenticators/eap/eap_sim.h b/src/charon/sa/authenticators/eap/eap_sim.h
index 10640babe..d50cf7397 100644
--- a/src/charon/sa/authenticators/eap/eap_sim.h
+++ b/src/charon/sa/authenticators/eap/eap_sim.h
@@ -24,59 +24,13 @@
 #define EAP_SIM_H_
 
 typedef struct eap_sim_t eap_sim_t;
-typedef enum sim_subtype_t sim_subtype_t;
-typedef enum sim_attribute_t sim_attribute_t;
 
 #include <sa/authenticators/eap/eap_method.h>
 
-/**
- * Subtypes of SIM messages
- */
-enum sim_subtype_t {
-	SIM_START = 10,
-	SIM_CHALLENGE = 11,
-	SIM_NOTIFICATION = 12,
-	SIM_CLIENT_ERROR = 14,
-};
-
-/**
- * enum names for sim_subtype_t
- */
-extern enum_name_t *sim_subtype_names;
-
-enum sim_attribute_t {
-	/** defines the end of attribute list */
-	AT_END = -1,
-	AT_RAND = 1,
-	AT_AUTN = 2,
-	AT_RES = 3,
-	AT_AUTS = 4,
-	AT_PADDING = 6,
-	AT_NONCE_MT = 7,
-	AT_PERMANENT_ID_REQ = 10,
-	AT_MAC = 11,
-	AT_NOTIFICATION = 12,
-	AT_ANY_ID_REQ = 13,
-	AT_IDENTITY = 14,
-	AT_VERSION_LIST = 15,
-	AT_SELECTED_VERSION = 16,
-	AT_FULLAUTH_ID_REQ = 17,
-	AT_COUNTER = 19,
-	AT_COUNTER_TOO_SMALL = 20,
-	AT_NONCE_S = 21,
-	AT_CLIENT_ERROR_CODE = 22,
-	AT_IV = 129,
-	AT_ENCR_DATA = 130,
-	AT_NEXT_PSEUDONYM = 132,
-	AT_NEXT_REAUTH_ID = 133,
-	AT_CHECKCODE = 134,
-	AT_RESULT_IND = 135,
-};
-
-/**
- * enum names for sim_subtype_t
- */
-extern enum_name_t *sim_attribute_names;
+/** the library containing with the triplet functions */
+#ifndef SIM_READER_LIB
+#error SIM_READER_LIB not specified, use --with-sim-reader option
+#endif /* SIM_READER_LIB */
 
 /** 
  * @brief Cardreaders SIM function.
@@ -93,24 +47,42 @@ typedef int (*sim_algo_t)(const unsigned char *rand, int rand_length,
 						  unsigned char *sres, int *sres_length, 
 						  unsigned char *kc, int *kc_length);
 
-#ifndef SIM_READER_LIB
-/** the library containing the cardreader with the SIM function */
-#error SIM_READER_LIB not specified, use --with-sim-reader option
-#endif /* SIM_READER_LIB */
-
 #ifndef SIM_READER_ALG
 /** the SIM_READER_LIB's algorithm, uses sim_algo_t signature */
 #define SIM_READER_ALG "sim_run_alg"
 #endif /* SIM_READER_ALG */
 
+/** 
+ * @brief Function to get a SIM triplet.
+ *
+ * @param identity		identity (imsi) to get a triplet for			
+ * @param rand			buffer to get RAND
+ * @param rand_length	size of buffer in rand, returns bytes written to RAND
+ * @param sres			buffer to get SRES
+ * @param sres_length	size of buffer in sres, returns bytes written to SRES
+ * @param kc			buffer to get Kc
+ * @param kc_length		size of buffer in Kc, returns bytes written to Kc
+ * @return				zero on success
+ */
+typedef int (*sim_get_triplet_t)(char *identity,
+								 unsigned char *rand, int *rand_length,
+								 unsigned char *sres, int *sres_length, 
+								 unsigned char *kc, int *kc_length);
+						  
+#ifndef SIM_READER_GET_TRIPLET
+/** the SIM_READER_LIB's get-triplet function, uses sim_get_triplet_t signature */
+#define SIM_READER_GET_TRIPLET "sim_get_triplet"
+#endif /* SIM_READER_GET_TRIPLET */
 
 /**
  * @brief Implementation of the eap_method_t interface using EAP-SIM.
  *
  * This EAP-SIM client implementation uses another pluggable library to
- * access the SIM card. This module is specified using the SIM_READER_LIB
- * definition. The function to run the algorithm has the sim_algo_t type and
- * is named as SIM_READER_ALG is defined.
+ * access the SIM card/triplet provider. This module is specified using the
+ * SIM_READER_LIB definition. It has to privde a sim_run_alg() function to
+ * calculate a triplet (client), and/or a sim_get_triplet() function to get
+ * a triplet (server). These functions are named to the SIM_READER_ALG and
+ * the SIM_READER_GET_TRIPLET definitions.
  *
  * @b Constructors:
  *  - eap_create() of this module
@@ -129,6 +101,7 @@ struct eap_sim_t {
 /**
  * @brief Creates the EAP method EAP-SIM.
  *
+ * @param role		role of the module, client/server
  * @param server	ID of the EAP server
  * @param peer		ID of the EAP client
  * @return			eap_sim_t object
diff --git a/src/charon/sa/authenticators/eap/sim/eap_sim_file.c b/src/charon/sa/authenticators/eap/sim/eap_sim_file.c
new file mode 100644
index 000000000..2ab45a578
--- /dev/null
+++ b/src/charon/sa/authenticators/eap/sim/eap_sim_file.c
@@ -0,0 +1,288 @@
+/**

+ * @file eap_sim.h

+ *

+ * @brief Interface of eap_sim_t.

+ *

+ */

+

+/*

+ * Copyright (C) 2007 Martin Willi

+ * 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 <string.h>

+#include <stdio.h>

+#include <errno.h>

+

+#include <daemon.h>

+

+#define IMSI_LEN 64

+#define RAND_LEN 16

+#define SRES_LEN 4

+#define KC_LEN 8

+

+typedef struct triplet_t triplet_t;

+

+struct triplet_t {

+	unsigned char imsi[IMSI_LEN];

+	unsigned char rand[RAND_LEN];

+	unsigned char sres[SRES_LEN];

+	unsigned char kc[KC_LEN];

+};

+

+static triplet_t *triplets = NULL;

+static int triplet_count = 0;

+

+#define TRIPLET_FILE IPSEC_CONFDIR "/ipsec.d/triplets.dat"

+

+/**

+ * convert a single HEX char to its integer value

+ */

+static int hexchr(char chr)

+{

+	switch (chr)

+	{

+		case '0'...'9':

+			return chr - '0';

+		case 'A'...'F':

+			return 10 + chr - 'A';

+		case 'a'...'f':

+			return 10 + chr - 'a';

+	}

+	return 0;

+}

+

+/**

+ * convert a HEX string into a char array bin, limited by array length len

+ */

+static void hex2bin(char *hex, unsigned char *bin, size_t len)

+{

+	char *pos;

+	int i, even = 1;

+	

+	pos = hex - 1;

+	/* find the end, as we convert bottom up */

+	while (TRUE)

+	{

+		switch (*(pos+1))

+		{

+			case '0'...'9':

+			case 'A'...'F':

+			case 'a'...'f':

+				pos++;

+				continue;

+		}

+		break;

+	}

+	/* convert two hex chars into a single bin byte */

+	for (i = 0; pos >= hex && i < len; pos--)

+	{

+		if (even)

+		{

+			bin[len - 1 - i] = hexchr(*pos);

+		}

+		else

+		{

+			bin[len - 1 - i] |= 16 * hexchr(*pos);

+			i++;

+		}

+		even = !even;

+	}

+}

+

+/**

+ * free up allocated triplets

+ */

+static void __attribute__ ((destructor)) free_triplets()

+{

+	free(triplets);

+}

+

+/**

+ * read the triplets from the file, using freeradius triplet file syntax:

+ * http://www.freeradius.org/radiusd/doc/rlm_sim_triplets

+ */

+static void __attribute__ ((constructor)) read_triplets()

+{

+	char line[512], *data[4], *pos;

+	FILE *file;

+	int i, nr = 0;

+	triplet_t *triplet;

+	

+	file = fopen(TRIPLET_FILE, "r");

+	if (file == NULL)

+	{

+		DBG1(DBG_CFG, "opening triplet file %s failed: %s",

+			 TRIPLET_FILE, strerror(errno));

+		return;

+	}

+	

+	if (triplets)

+	{

+		free(triplets);

+		triplets = NULL;

+		triplet_count = 0;

+	}

+	

+	/* read line by line */

+	while (fgets(line, sizeof(line), file))

+	{

+		nr++;

+		/* skip comments, empty lines */

+		switch (line[0])

+		{

+			case '\n':

+			case '\r':

+			case '#':

+			case '\0':

+				continue;

+			default:

+				break;

+		}

+		/* read comma separated values */

+		pos = line;

+		for (i = 0; i < 4; i++)

+		{

+			data[i] = pos;

+			pos = strchr(pos, ',');

+			if (pos)

+			{

+				*pos = '\0';

+				pos++;

+			}

+			else if (i != 3)

+			{

+				DBG1(DBG_CFG, "error in triplet file, line %d", nr);

+				fclose(file);

+				return;

+			}

+		}

+		/* allocate new triplet */

+		triplet_count++;

+		triplets = realloc(triplets, triplet_count * sizeof(triplet_t));

+		triplet = &triplets[triplet_count - 1];

+		memset(triplet, 0, sizeof(triplet_t));

+		

+		/* convert/copy triplet data */

+		for (i = 0; i < IMSI_LEN - 1; i++)

+		{

+			switch (data[0][i])

+			{

+				case '\n':

+				case '\r':

+				case '\0':

+					break;

+				default:

+					triplet->imsi[i] = data[0][i];

+					continue;

+			}

+			break;

+		}

+		hex2bin(data[1], triplet->rand, RAND_LEN);

+		hex2bin(data[2], triplet->sres, SRES_LEN);

+		hex2bin(data[3], triplet->kc, KC_LEN);

+		

+		DBG4(DBG_CFG, "triplet: imsi %b\nrand %b\nsres %b\nkc %b",

+			 triplet->imsi, IMSI_LEN, triplet->rand, RAND_LEN,

+			 triplet->sres, SRES_LEN, triplet->kc, KC_LEN);

+	}

+	fclose(file);

+	DBG2(DBG_CFG, "read %d triplets from %s", triplet_count, TRIPLET_FILE);

+}

+

+/**

+ * Run the sim algorithm, see eap_sim.h

+ */

+int sim_run_alg(const unsigned char *rand, int rand_length,

+				unsigned char *sres, int *sres_length, 

+				unsigned char *kc, int *kc_length)

+{

+	int current;

+	

+	if (rand_length != RAND_LEN ||

+		*sres_length < SRES_LEN ||

+		*kc_length < KC_LEN)

+	{

+		return 1;

+	}

+	

+	for (current = 0; current < triplet_count; current++)

+	{

+		if (memcmp(triplets[current].rand, rand, RAND_LEN) == 0)

+		{

+			memcpy(sres, triplets[current].sres, SRES_LEN);

+			memcpy(kc, triplets[current].kc, KC_LEN);

+			*sres_length = SRES_LEN;

+			*kc_length = KC_LEN;

+			return 0;

+		}

+	}

+	return 2;

+}

+

+/**

+ * Get a single triplet, see_eap_sim.h

+ */

+int sim_get_triplet(char *imsi,

+					unsigned char *rand, int *rand_length,

+					unsigned char *sres, int *sres_length, 

+					unsigned char *kc, int *kc_length)

+{

+	int current;

+	triplet_t *triplet;

+	static int skip = -1;

+	

+	DBG2(DBG_CFG, "getting triplet for %s", imsi);

+	

+	if (*rand_length < RAND_LEN ||

+		*sres_length < SRES_LEN ||

+		*kc_length < KC_LEN)

+	{

+		return 1;

+	}

+	if (triplet_count == 0)

+	{

+		return 2;

+	}

+	for (current = 0; current < triplet_count; current++)

+	{

+		triplet = &triplets[current];

+	

+		if (streq(imsi, triplet->imsi))

+		{

+			/* skip triplet if already used */

+			if (skip >= current)

+			{

+				continue;

+			}

+			*rand_length = RAND_LEN;

+			*sres_length = SRES_LEN;

+			*kc_length = KC_LEN;

+			memcpy(rand, triplet->rand, RAND_LEN);

+			memcpy(sres, triplet->sres, SRES_LEN);

+			memcpy(kc, triplet->kc, KC_LEN);

+			/* remember used triplet */

+			skip = current;

+			return 0;

+		}

+	}

+	if (skip > -1)

+	{

+		/* no triplet left, reuse triplets */

+		skip = -1;

+		return sim_get_triplet(imsi, rand, rand_length,

+							   sres, sres_length, kc, kc_length);

+	}

+	return 2;

+}

+

diff --git a/src/charon/sa/authenticators/eap_authenticator.c b/src/charon/sa/authenticators/eap_authenticator.c
index 6250604a6..edd75da43 100644
--- a/src/charon/sa/authenticators/eap_authenticator.c
+++ b/src/charon/sa/authenticators/eap_authenticator.c
@@ -147,7 +147,7 @@ static status_t initiate(private_eap_authenticator_t *this, eap_type_t type,
 	{
 		DBG1(DBG_IKE,
 			 "client requested EAP authentication, but configuration forbids it");
-		*out = eap_payload_create_code(EAP_FAILURE);
+		*out = eap_payload_create_code(EAP_FAILURE, 0);
 		return FAILED;
 	}
 	
@@ -169,14 +169,14 @@ static status_t initiate(private_eap_authenticator_t *this, eap_type_t type,
 
 		DBG1(DBG_IKE, "configured EAP server method not supported, sending %N",
 			 eap_code_names, EAP_FAILURE);
-		*out = eap_payload_create_code(EAP_FAILURE);
+		*out = eap_payload_create_code(EAP_FAILURE, 0);
 		return FAILED;
 	}
 	if (this->method->initiate(this->method, out) != NEED_MORE)
 	{
 		DBG1(DBG_IKE, "failed to initiate EAP exchange, sending %N",
 			 eap_type_names, type, eap_code_names, EAP_FAILURE);
-		*out = eap_payload_create_code(EAP_FAILURE);
+		*out = eap_payload_create_code(EAP_FAILURE, 0);
 		return FAILED;	
 	}
 	return NEED_MORE;
@@ -234,7 +234,7 @@ static status_t process_peer(private_eap_authenticator_t *this,
 		{
 			DBG1(DBG_IKE, "EAP server requested unsupported "
 				 "EAP method, sending EAP_NAK");
-			*out = eap_payload_create_nak();
+			*out = eap_payload_create_nak(in->get_identifier(in));
 			return NEED_MORE;
 		}
 	}
@@ -303,7 +303,7 @@ static status_t process_server(private_eap_authenticator_t *this,
 				DBG1(DBG_IKE, "EAP method %N succeded, %sMSK established",
 					 eap_type_names, type, this->msk.ptr ? "" : "no ");
 			}
-			*out = eap_payload_create_code(EAP_SUCCESS);
+			*out = eap_payload_create_code(EAP_SUCCESS, in->get_identifier(in));
 			return SUCCESS;
 		case FAILED:
 		default:
@@ -319,7 +319,7 @@ static status_t process_server(private_eap_authenticator_t *this,
 					 eap_type_names, type,
 					 this->ike_sa->get_other_id(this->ike_sa));
 			}
-			*out = eap_payload_create_code(EAP_FAILURE);
+			*out = eap_payload_create_code(EAP_FAILURE, in->get_identifier(in));
 			return FAILED;
 	}
 }
@@ -346,7 +346,8 @@ static status_t process(private_eap_authenticator_t *this, eap_payload_t *in,
 				{
 					DBG1(DBG_IKE, "received %N, sending %N",
 						 eap_code_names, code, eap_code_names, EAP_FAILURE);
-					*out = eap_payload_create_code(EAP_FAILURE);
+					*out = eap_payload_create_code(EAP_FAILURE,
+												   in->get_identifier(in));
 					return FAILED;
 				}
 			}