7 files changed, 2165 insertions, 0 deletions
diff --git a/src/charon/plugins/eap_sim/Makefile.am b/src/charon/plugins/eap_sim/Makefile.am
new file mode 100644
index 000000000..63267b9d3
--- /dev/null
+++ b/src/charon/plugins/eap_sim/Makefile.am
@@ -0,0 +1,13 @@
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/charon
+
+AM_CFLAGS = -rdynamic -DIPSEC_CONFDIR=\"${confdir}\" -DSIM_READER_LIB=\"${simreader}\"
+
+plugin_LTLIBRARIES = libstrongswan-eapsim.la libeapsim-file.la
+
+libstrongswan_eapsim_la_SOURCES = eap_sim_plugin.h eap_sim_plugin.c eap_sim.h eap_sim.c
+libstrongswan_eapsim_la_LDFLAGS = -module
+
+libeapsim_file_la_SOURCES = eap_sim_file.c
+libeapsim_file_la_LDFLAGS = -module
+
diff --git a/src/charon/plugins/eap_sim/Makefile.in b/src/charon/plugins/eap_sim/Makefile.in
new file mode 100644
index 000000000..e70f8457c
--- /dev/null
+++ b/src/charon/plugins/eap_sim/Makefile.in
@@ -0,0 +1,508 @@
+# Makefile.in generated by automake 1.10.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006, 2007, 2008  Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
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+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
+	clean-libtool clean-pluginLTLIBRARIES ctags distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-pluginLTLIBRARIES \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags uninstall uninstall-am uninstall-pluginLTLIBRARIES
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/charon/plugins/eap_sim/eap_sim.c b/src/charon/plugins/eap_sim/eap_sim.c
new file mode 100644
index 000000000..b14076f34
--- /dev/null
+++ b/src/charon/plugins/eap_sim/eap_sim.c
@@ -0,0 +1,1149 @@
+/*
+ * 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.
+ *
+ * $Id: eap_sim.c 3806 2008-04-15 05:56:35Z martin $
+ */
+
+#include "eap_sim.h"
+
+#include <dlfcn.h>
+
+#include <daemon.h>
+#include <library.h>
+
+#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",
+	"SIM_NOTIFICATION",
+	"SIM_13",
+	"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",
+	"AT_RAND",
+	"AT_AUTN",
+	"AT_RES",
+	"AT_AUTS",
+	"AT_5",
+	"AT_PADDING",
+	"AT_NONCE_MT",
+	"AT_8",
+	"AT_9",
+	"AT_PERMANENT_ID_REQ",
+	"AT_MAC",
+	"AT_NOTIFICATION",
+	"AT_ANY_ID_REQ",
+	"AT_IDENTITY",
+	"AT_VERSION_LIST",
+	"AT_SELECTED_VERSION",
+	"AT_FULLAUTH_ID_REQ",
+	"AT_18",
+	"AT_COUNTER",
+	"AT_COUNTER_TOO_SMALL",
+	"AT_NONCE_S",
+	"AT_CLIENT_ERROR_CODE");
+ENUM_NEXT(sim_attribute_names, AT_IV, AT_RESULT_IND, AT_CLIENT_ERROR_CODE,
+	"AT_IV",
+	"AT_ENCR_DATA",
+	"AT_131",
+	"AT_NEXT_PSEUDONYM",
+	"AT_NEXT_REAUTH_ID",
+	"AT_CHECKCODE",
+	"AT_RESULT_IND");
+ENUM_END(sim_attribute_names, AT_RESULT_IND);
+
+
+typedef struct private_eap_sim_t private_eap_sim_t;
+
+/**
+ * Private data of an eap_sim_t object.
+ */
+struct private_eap_sim_t {
+	
+	/**
+	 * Public authenticator_t interface.
+	 */
+	eap_sim_t public;
+	
+	/**
+	 * ID of ourself
+	 */
+	identification_t *peer;
+	
+	/**
+	 * hashing function
+	 */
+	hasher_t *hasher;
+	
+	/**
+	 * prf
+	 */
+	prf_t *prf;
+	
+	/**
+	 * MAC function
+	 */
+	signer_t *signer;
+	
+	/**
+	 * SIM cardreader function loaded from library
+	 */
+	sim_algo_t alg;
+	
+	/**
+	 * libraries get_triplet() function returning a triplet
+	 */
+	sim_get_triplet_t get_triplet;
+	
+	/**
+	 * handle of the loaded library
+	 */
+	void *handle;
+	
+	/**
+	 * how many times we try to authenticate
+	 */
+	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;
+	
+	/**
+	 * version list received from server
+	 */
+	chunk_t version_list;
+	
+	/**
+	 * Nonce value used in AT_NONCE_MT
+	 */
+	chunk_t nonce;
+	
+	/**
+	 * concatenated SRES values
+	 */
+	chunk_t sreses;
+	
+	/**
+	 * k_encr key derived from MK
+	 */
+	chunk_t k_encr;
+	
+	/**
+	 * k_auth key derived from MK, used for AT_MAC verification
+	 */
+	chunk_t k_auth;
+	
+	/**
+	 * MSK, used for EAP-SIM based IKEv2 authentication
+	 */
+	chunk_t msk;
+	
+	/**
+	 * EMSK, extendes MSK for further uses
+	 */
+	chunk_t emsk;
+};
+
+/** length of the AT_NONCE_MT nonce value */
+#define NONCE_LEN 16
+/** length of the AT_MAC value */
+#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 */
+#define KAUTH_LEN 16
+/** length of the MSK */
+#define MSK_LEN 64
+/** 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};
+char client_error_insufficient_buf[] = {0x00, 0x03};
+char client_error_notfresh_buf[] = {0x00, 0x04};
+chunk_t client_error_general = chunk_from_buf(client_error_general_buf);
+chunk_t client_error_unsupported = chunk_from_buf(client_error_unsupported_buf);
+chunk_t client_error_insufficient = chunk_from_buf(client_error_insufficient_buf);
+chunk_t client_error_notfresh = chunk_from_buf(client_error_notfresh_buf);
+
+/**
+ * Read EAP and EAP-SIM header, return SIM type
+ */
+static sim_subtype_t read_header(chunk_t *message)
+{
+	sim_subtype_t type;
+
+	if (message->len < 8)
+	{
+		*message = chunk_empty;
+		return 0;
+	}
+	type = *(message->ptr + 5);
+	*message = chunk_skip(*message, 8);
+	return type;
+}
+
+/**
+ * read the next attribute from the chunk data
+ */
+static sim_attribute_t read_attribute(chunk_t *message, chunk_t *data)
+{
+	sim_attribute_t attribute;
+	size_t length;
+	
+	DBG3(DBG_IKE, "reading attribute from %B", message);
+	
+	if (message->len < 2)
+	{
+		return AT_END;
+	}
+	attribute = *message->ptr++;
+	length = *message->ptr++ * 4 - 2;
+	message->len -= 2;
+	DBG3(DBG_IKE, "found attribute %N with length %d",
+		 sim_attribute_names, attribute, length);
+
+	if (length > message->len)
+	{
+		return AT_END;
+	}
+	data->len = length;
+	data->ptr = message->ptr;
+	*message = chunk_skip(*message, length);
+	return attribute;
+}
+
+/**
+ * Build an EAP-SIM payload using a variable length attribute list.
+ * The variable argument takes a sim_attribute_t followed by its data in a chunk.
+ */
+static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier,
+									sim_subtype_t type, ...)
+{
+	chunk_t message = chunk_alloca(512);
+	chunk_t pos = message;
+	eap_payload_t *payload;
+	va_list args;
+	sim_attribute_t attr;
+	u_int8_t *mac_pos = NULL;
+	chunk_t mac_data = chunk_empty;
+	
+	/* write EAP header, skip length bytes */
+	*pos.ptr++ = this->type;
+	*pos.ptr++ = identifier;
+	pos.ptr += 2;
+	pos.len -= 4;
+	/* write SIM header with type and subtype, zero reserved bytes */
+	*pos.ptr++ = EAP_SIM;
+	*pos.ptr++ = type;
+	*pos.ptr++ = 0;
+	*pos.ptr++ = 0;
+	pos.len -= 4;
+	
+	va_start(args, type);
+	while ((attr = va_arg(args, sim_attribute_t)) != AT_END)
+	{
+		chunk_t data = va_arg(args, chunk_t);
+		
+		DBG3(DBG_IKE, "building %N %B", sim_attribute_names, attr, &data);
+		
+		/* write attribute header */
+		*pos.ptr++ = attr;
+		pos.len--;
+		
+		switch (attr)
+		{
+			case AT_CLIENT_ERROR_CODE:
+			case AT_SELECTED_VERSION:
+			{
+				*pos.ptr = data.len/4 + 1;
+				pos = chunk_skip(pos, 1);
+				memcpy(pos.ptr, data.ptr, data.len);
+				pos = chunk_skip(pos, data.len);
+				break;
+			}
+			case AT_IDENTITY:
+			case AT_VERSION_LIST:
+			{
+				u_int16_t act_len = data.len;
+				/* align up to four byte */
+				if (data.len % 4)
+				{
+					chunk_t tmp = chunk_alloca((data.len/4)*4 + 4);
+					memset(tmp.ptr, 0, tmp.len);
+					memcpy(tmp.ptr, data.ptr, data.len);
+					data = tmp;
+				}
+				*pos.ptr = data.len/4 + 1;
+				pos = chunk_skip(pos, 1);
+				/* actual length in bytes */
+				*(u_int16_t*)pos.ptr = htons(act_len);
+				pos = chunk_skip(pos, sizeof(u_int16_t));
+				memcpy(pos.ptr, data.ptr, data.len);
+				pos = chunk_skip(pos, data.len);
+				break;
+			}
+			case AT_NONCE_MT:
+			{
+				*pos.ptr = data.len/4 + 1;
+				pos = chunk_skip(pos, 1);
+				memset(pos.ptr, 0, 2);
+				pos = chunk_skip(pos, 2);
+				memcpy(pos.ptr, data.ptr, data.len);
+				pos = chunk_skip(pos, data.len);
+				break;
+			}
+			case AT_MAC:
+			{
+				*pos.ptr++ = 5; pos.len--;
+				*pos.ptr++ = 0; pos.len--;
+				*pos.ptr++ = 0; pos.len--;
+				mac_pos = pos.ptr;
+				memset(mac_pos, 0, MAC_LEN);
+				pos = chunk_skip(pos, MAC_LEN);
+				mac_data = data;
+				break;
+			}
+			case AT_RAND:
+			{
+				*pos.ptr++ = data.len/4 + 1; pos.len--;
+				*pos.ptr++ = 0; pos.len--;
+				*pos.ptr++ = 0; pos.len--;
+				memcpy(pos.ptr, data.ptr, data.len);
+				pos = chunk_skip(pos, data.len);
+				break;
+			}
+			default:
+				DBG1(DBG_IKE, "no rule to build EAP_SIM attribute %N, skipped",
+					 sim_attribute_names, attr);
+				break;
+		}
+	}
+	va_end(args);
+	
+	/* calculate message length, write into header */
+	message.len = pos.ptr - message.ptr;
+	*(u_int16_t*)(message.ptr + 2) = htons(message.len);
+	
+	/* create MAC if AT_MAC attribte was included. Append supplied va_arg
+	 * chunk mac_data to "to-sign" chunk */
+	if (mac_pos)
+	{
+		this->signer->set_key(this->signer, this->k_auth);
+		mac_data = chunk_cata("cc", message, mac_data);
+		this->signer->get_signature(this->signer, mac_data, mac_pos);
+		DBG3(DBG_IKE, "AT_MAC signature of %B\n is %b",
+			 &mac_data, mac_pos, MAC_LEN);
+	}
+	
+	payload = eap_payload_create_data(message);
+	
+	DBG3(DBG_IKE, "created EAP message %B", &message);
+	return payload;
+}
+
+/**
+ * process an EAP-SIM/Request/Start message
+ */
+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;
+	u_int8_t identifier;
+
+	identifier = in->get_identifier(in);
+	message = in->get_data(in);
+	read_header(&message);
+
+	while ((attribute = read_attribute(&message, &data)) != AT_END)
+	{
+		switch (attribute)
+		{
+			case AT_VERSION_LIST:
+			{
+				/* check if server supports our implementation */
+				bool found = FALSE;
+				if (data.len > 2)
+				{
+					/* read actual length first */
+					data.len = min(data.len, ntohs(*(u_int16_t*)data.ptr) + 2);
+					data = chunk_skip(data, 2);
+					chunk_free(&this->version_list);
+					this->version_list = chunk_clone(data);
+					while (data.len >= this->version.len)
+					{
+						if (memeq(data.ptr, this->version.ptr, this->version.len))
+						{
+							found = TRUE;
+							break;
+						}
+						data = chunk_skip(data, this->version.len);
+					}
+				}
+				if (!found)
+				{
+					DBG1(DBG_IKE, "server does not support EAP_SIM "
+						 "version number %#B", &this->version);
+					*out = build_payload(this, identifier, SIM_CLIENT_ERROR,
+							AT_CLIENT_ERROR_CODE, client_error_unsupported,
+							AT_END);
+					return NEED_MORE;
+				}
+				break;
+			}
+			case AT_PERMANENT_ID_REQ:
+			case AT_FULLAUTH_ID_REQ:
+			case AT_ANY_ID_REQ:
+				/* only include AT_IDENTITY if requested */
+				include_id = AT_IDENTITY;
+				break;
+			case AT_NOTIFICATION:
+			{
+				u_int16_t code = 0;
+				if (data.len == 2)
+				{
+					code = ntohs(*(u_int16_t*)data.ptr);
+				}
+				if (code <= 32767) /* no success bit */
+				{
+					DBG1(DBG_IKE, "received %N error %d",
+				 		 sim_attribute_names, attribute, code);
+					*out = build_payload(this,
+									in->get_identifier(in), SIM_CLIENT_ERROR,
+						 			AT_CLIENT_ERROR_CODE, client_error_general,
+									AT_END);
+					return NEED_MORE;
+				}
+				else
+				{
+					DBG1(DBG_IKE, "received %N code %d",
+				 		 sim_attribute_names, attribute, code);
+				}
+				break;
+			}
+			default:
+				DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+					 sim_attribute_names, attribute);
+				break;
+		}
+	}
+	
+	/* build payload. If "include_id" is AT_END, AT_IDENTITY is ommited */
+	*out = build_payload(this, identifier, SIM_START,
+						 AT_SELECTED_VERSION, this->version,
+						 AT_NONCE_MT, this->nonce,
+						 include_id, this->peer->get_encoding(this->peer),
+						 AT_END);
+	return NEED_MORE;
+}
+
+/**
+ * derive EAP keys from kc
+ */
+static void derive_keys(private_eap_sim_t *this, chunk_t kcs)
+{
+	chunk_t tmp, mk;
+	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);
+	mk = chunk_alloca(this->hasher->get_hash_size(this->hasher));
+	this->hasher->get_hash(this->hasher, tmp, mk.ptr);
+	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 */
+	this->prf->set_key(this->prf, mk);
+	tmp = chunk_alloca(this->prf->get_block_size(this->prf) * 4);
+	for (i = 0; i < 4; i++)
+	{
+		this->prf->get_bytes(this->prf, chunk_empty, tmp.ptr + tmp.len / 4 * i);
+	}
+	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 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;
+	sim_attribute_t attribute;
+	u_int8_t identifier;
+	chunk_t mac = chunk_empty, rands = chunk_empty;
+	
+	if (this->tries-- <= 0)
+	{
+		/* give up without notification. This hack is required as some buggy
+		 * server implementations won't respect our client-error. */
+		return FAILED;
+	}
+
+	identifier = in->get_identifier(in);
+	message = in->get_data(in);
+	read_header(&message);
+
+	while ((attribute = read_attribute(&message, &data)) != AT_END)
+	{
+		switch (attribute)
+		{
+			case AT_RAND:
+			{
+				rands = chunk_skip(data, 2);
+				break;
+			}
+			case AT_MAC:
+			{
+				/* backup MAC, zero it inline for later verification */
+				data = chunk_skip(data, 2);
+				mac = chunk_clonea(data);
+				memset(data.ptr, 0, data.len);
+				break;
+			}
+			case AT_NOTIFICATION:
+			{
+				u_int16_t code = 0;
+				if (data.len == 2)
+				{
+					code = ntohs(*(u_int16_t*)data.ptr);
+				}
+				if (code <= 32767) /* no success bit */
+				{
+					DBG1(DBG_IKE, "received %N error %d",
+				 		 sim_attribute_names, attribute, code);
+					*out = build_payload(this,
+									in->get_identifier(in), SIM_CLIENT_ERROR,
+						 			AT_CLIENT_ERROR_CODE, client_error_general,
+									AT_END);
+					return NEED_MORE;
+				}
+				else
+				{
+					DBG1(DBG_IKE, "received %N code %d",
+				 		 sim_attribute_names, attribute, code);
+				}
+				break;
+			}
+			default:
+				DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+					 sim_attribute_names, attribute);
+				break;
+		}
+	}
+	
+	/* excepting two or three RAND, each 16 bytes. We require two valid
+	 * and different RANDs */
+	if ((rands.len != 2 * RAND_LEN && rands.len != 3 * RAND_LEN) ||
+		memeq(rands.ptr, rands.ptr + RAND_LEN, RAND_LEN))
+	{
+		DBG1(DBG_IKE, "no valid AT_RAND received");
+		*out = build_payload(this, identifier, SIM_CLIENT_ERROR,
+							 AT_CLIENT_ERROR_CODE, client_error_insufficient,
+							 AT_END);
+		return NEED_MORE;
+	}
+	if (mac.len != MAC_LEN)
+	{
+		DBG1(DBG_IKE, "no valid AT_MAC received");
+		*out = build_payload(this, identifier, SIM_CLIENT_ERROR,
+							 AT_CLIENT_ERROR_CODE, client_error_general,
+							 AT_END);
+		return NEED_MORE;
+	}
+	
+	/* get two or three KCs/SRESes from SIM using RANDs */
+	kcs = kc = chunk_alloca(rands.len / 2);
+	sreses = sres = chunk_alloca(rands.len / 4);
+	while (rands.len > 0)
+	{
+		int kc_len = kc.len, sres_len = sres.len;
+		
+		if (this->alg(rands.ptr, RAND_LEN, sres.ptr, &sres_len, kc.ptr, &kc_len))
+		{
+			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);
+			return NEED_MORE;
+		}
+		DBG3(DBG_IKE, "got triplet for RAND %b\n  Kc %b\n  SRES %b",
+			 rands.ptr, RAND_LEN, sres.ptr, sres_len, kc.ptr, kc_len);
+		kc = chunk_skip(kc, kc_len);
+		sres = chunk_skip(sres, sres_len);
+		rands = chunk_skip(rands, RAND_LEN);
+	}
+	
+	derive_keys(this, kcs);
+	
+	/* verify AT_MAC attribute, signature is over "EAP packet | NONCE_MT"  */
+	this->signer->set_key(this->signer, this->k_auth);
+	tmp = chunk_cata("cc", in->get_data(in), this->nonce);
+	if (!this->signer->verify_signature(this->signer, tmp, mac))
+	{
+		DBG1(DBG_IKE, "AT_MAC verification failed");
+		*out = build_payload(this, identifier, SIM_CLIENT_ERROR,
+							 AT_CLIENT_ERROR_CODE, client_error_general,
+							 AT_END);
+		return NEED_MORE;
+	}
+	
+	/* build response, AT_MAC is built over "EAP packet | n*SRES" */
+	*out = build_payload(this, identifier, SIM_CHALLENGE,
+						 AT_MAC, sreses,
+						 AT_END);
+	return NEED_MORE;
+}
+
+/**
+ * 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;
+	
+	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"  */
+	this->signer->set_key(this->signer, this->k_auth);
+	tmp = chunk_cata("cc", in->get_data(in), this->sreses);
+	if (!this->signer->verify_signature(this->signer, tmp, mac))
+	{
+		DBG1(DBG_IKE, "AT_MAC verification failed");
+		return FAILED;
+	}
+	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 peer_process_notification(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)
+	{
+		switch (attribute)
+		{
+			case AT_NOTIFICATION:
+			{
+				u_int16_t code = 0;
+				if (data.len == 2)
+				{
+					code = ntohs(*(u_int16_t*)data.ptr);
+				}
+				if (code <= 32767) /* no success bit */
+				{
+					DBG1(DBG_IKE, "received %N error %d",
+				 		 sim_attribute_names, attribute, code);
+					*out = build_payload(this,
+									in->get_identifier(in), SIM_CLIENT_ERROR,
+						 			AT_CLIENT_ERROR_CODE, client_error_general,
+									AT_END);
+					return NEED_MORE;
+				}
+				else
+				{
+					DBG1(DBG_IKE, "received %N code %d",
+				 		 sim_attribute_names, attribute, code);
+				}
+				break;
+			}
+			default:
+				DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+					 sim_attribute_names, attribute);
+				break;
+		}
+	}
+	/* reply with empty notification */
+	*out = build_payload(this, in->get_identifier(in), SIM_NOTIFICATION, AT_END);
+	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 peer_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 peer_process_start(this, in, out);
+		case SIM_CHALLENGE:
+			return peer_process_challenge(this, in, out);
+		case SIM_NOTIFICATION:
+			return peer_process_notification(this, in, out);
+		default:
+			DBG1(DBG_IKE, "unable to process EAP_SIM subtype %N",
+				 sim_subtype_names, type);
+			*out = build_payload(this, in->get_identifier(in), SIM_CLIENT_ERROR,
+					AT_CLIENT_ERROR_CODE, client_error_general, AT_END);
+			return NEED_MORE;
+	}
+}
+
+/**
+ * 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 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)
+{
+	*vendor = 0;
+	return EAP_SIM;
+}
+
+/**
+ * Implementation of eap_method_t.get_msk.
+ */
+static status_t get_msk(private_eap_sim_t *this, chunk_t *msk)
+{
+	if (this->msk.ptr)
+	{
+		*msk = this->msk;
+		return SUCCESS;
+	}
+	return FAILED;
+}
+
+/**
+ * Implementation of eap_method_t.is_mutual.
+ */
+static bool is_mutual(private_eap_sim_t *this)
+{
+	return TRUE;
+}
+
+/**
+ * Implementation of eap_method_t.destroy.
+ */
+static void destroy(private_eap_sim_t *this)
+{
+	dlclose(this->handle);
+	DESTROY_IF(this->hasher);
+	DESTROY_IF(this->prf);
+	DESTROY_IF(this->signer);
+	chunk_free(&this->nonce);
+	chunk_free(&this->sreses);
+	chunk_free(&this->version_list);
+	chunk_free(&this->k_auth);
+	chunk_free(&this->k_encr);
+	chunk_free(&this->msk);
+	chunk_free(&this->emsk);
+	free(this);
+}
+
+/**
+ * Generic constructor for both roles
+ */
+eap_sim_t *eap_sim_create_generic(eap_role_t role, identification_t *server,
+								  identification_t *peer)
+{
+	private_eap_sim_t *this;
+	rng_t *rng;
+	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);
+		free(this);
+		return NULL;
+	}
+	switch (role)
+	{
+		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;
+	}
+	switch (role)
+	{
+		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;
+			rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+			if (!rng)
+			{
+				DBG1(DBG_IKE, "unable to generate NONCE for EAP_SIM");
+				free(this);
+				return NULL;
+			}
+			rng->allocate_bytes(rng, NONCE_LEN, &this->nonce);
+			rng->destroy(rng);
+ 			break;
+		default:
+			free(this);
+			return NULL;
+	}
+	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;
+	
+	this->hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+	this->prf = lib->crypto->create_prf(lib->crypto, PRF_FIPS_SHA1_160);
+	this->signer = lib->crypto->create_signer(lib->crypto, AUTH_HMAC_SHA1_128);
+	if (!this->hasher || !this->prf || !this->signer)
+	{
+		DBG1(DBG_IKE, "initiating EAP-SIM failed, FIPS-PRF/SHA1 not supported");
+		destroy(this);
+		return NULL;
+	}
+	return &this->public;
+}
+
+/*
+ * Described in header.
+ */
+eap_sim_t *eap_sim_create_server(identification_t *server,
+								 identification_t *peer)
+{
+	return eap_sim_create_generic(EAP_SERVER, server, peer);
+}
+
+/*
+ * Described in header.
+ */
+eap_sim_t *eap_sim_create_peer(identification_t *server,
+							   identification_t *peer)
+{
+	return eap_sim_create_generic(EAP_PEER, server, peer);
+}
+								 
diff --git a/src/charon/plugins/eap_sim/eap_sim.h b/src/charon/plugins/eap_sim/eap_sim.h
new file mode 100644
index 000000000..65020aa64
--- /dev/null
+++ b/src/charon/plugins/eap_sim/eap_sim.h
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2007-2008 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.
+ */
+
+/**
+ * @defgroup eap_sim_i eap_sim
+ * @{ @ingroup eap_sim
+ */
+
+#ifndef EAP_SIM_H_
+#define EAP_SIM_H_
+
+typedef struct eap_sim_t eap_sim_t;
+
+#include <sa/authenticators/eap/eap_method.h>
+
+/** 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 */
+
+/** 
+ * Cardreaders SIM function.
+ *
+ * @param rand			RAND to run algo with
+ * @param rand_length	length of value in 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_algo_t)(const unsigned char *rand, int rand_length,
+						  unsigned char *sres, int *sres_length, 
+						  unsigned char *kc, int *kc_length);
+
+#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 */
+
+/** 
+ * 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 */
+
+/**
+ * Implementation of the eap_method_t interface using EAP-SIM.
+ *
+ * This EAP-SIM client implementation uses another pluggable library to
+ * 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.
+ */
+struct eap_sim_t {
+
+	/**
+	 * Implemented eap_method_t interface.
+	 */
+	eap_method_t eap_method_interface;
+};
+
+/**
+ * Creates the EAP method EAP-SIM acting as server.
+ *
+ * @param server	ID of the EAP server
+ * @param peer		ID of the EAP client
+ * @return			eap_sim_t object
+ */
+eap_sim_t *eap_sim_create_server(identification_t *server, identification_t *peer);
+
+/**
+ * Creates the EAP method EAP-SIM acting as peer.
+ *
+ * @param server	ID of the EAP server
+ * @param peer		ID of the EAP client
+ * @return			eap_sim_t object
+ */
+eap_sim_t *eap_sim_create_peer(identification_t *server, identification_t *peer);
+
+#endif /* EAP_SIM_H_ @}*/
diff --git a/src/charon/plugins/eap_sim/eap_sim_file.c b/src/charon/plugins/eap_sim/eap_sim_file.c
new file mode 100644
index 000000000..fc4c1af26
--- /dev/null
+++ b/src/charon/plugins/eap_sim/eap_sim_file.c
@@ -0,0 +1,283 @@
+/*
+ * 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.
+ *
+ * $Id: eap_sim_file.c 3491 2008-02-22 14:04:00Z martin $
+ */
+
+#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/plugins/eap_sim/eap_sim_plugin.c b/src/charon/plugins/eap_sim/eap_sim_plugin.c
new file mode 100644
index 000000000..d937c57b4
--- /dev/null
+++ b/src/charon/plugins/eap_sim/eap_sim_plugin.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2008 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.
+ *
+ * $Id: eap_sim_plugin.c 3491 2008-02-22 14:04:00Z martin $
+ */
+
+#include "eap_sim_plugin.h"
+
+#include "eap_sim.h"
+
+#include <daemon.h>
+
+/**
+ * Implementation of plugin_t.destroy
+ */
+static void destroy(eap_sim_plugin_t *this)
+{
+	charon->eap->remove_method(charon->eap,
+							   (eap_constructor_t)eap_sim_create_server);
+	charon->eap->remove_method(charon->eap,
+							   (eap_constructor_t)eap_sim_create_peer);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+plugin_t *plugin_create()
+{
+	eap_sim_plugin_t *this = malloc_thing(eap_sim_plugin_t);
+	
+	this->plugin.destroy = (void(*)(plugin_t*))destroy;
+	
+	charon->eap->add_method(charon->eap, EAP_SIM, 0, EAP_SERVER,
+							(eap_constructor_t)eap_sim_create_server);
+	charon->eap->add_method(charon->eap, EAP_SIM, 0, EAP_PEER,
+							(eap_constructor_t)eap_sim_create_peer);
+	
+	return &this->plugin;
+}
+
diff --git a/src/charon/plugins/eap_sim/eap_sim_plugin.h b/src/charon/plugins/eap_sim/eap_sim_plugin.h
new file mode 100644
index 000000000..938807884
--- /dev/null
+++ b/src/charon/plugins/eap_sim/eap_sim_plugin.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2008 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.
+ *
+ * $Id: eap_sim_plugin.h 3491 2008-02-22 14:04:00Z martin $
+ */
+
+/**
+ * @defgroup eap_sim eap_sim
+ * @ingroup cplugins
+ *
+ * @defgroup eap_sim_plugin eap_sim_plugin
+ * @{ @ingroup eap_sim
+ */
+
+#ifndef EAP_SIM_PLUGIN_H_
+#define EAP_SIM_PLUGIN_H_
+
+#include <plugins/plugin.h>
+
+typedef struct eap_sim_plugin_t eap_sim_plugin_t;
+
+/**
+ * EAP-sim plugin
+ */
+struct eap_sim_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	plugin_t plugin;
+};
+
+/**
+ * Create a eap_sim_plugin instance.
+ */
+plugin_t *plugin_create();
+
+#endif /* EAP_SIM_PLUGIN_H_ @}*/