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authorRene Mayrhofer <rene@mayrhofer.eu.org>2008-07-09 21:02:41 +0000
committerRene Mayrhofer <rene@mayrhofer.eu.org>2008-07-09 21:02:41 +0000
commitdb67c87db3c9089ea8d2e14f617bf3d9e2af261f (patch)
tree665c0caea83d34c11c1517c4c57137bb58cba6fb /src/charon/plugins/eap_sim
parent1c088a8b6237ec67f63c23f97a0f2dc4e99af869 (diff)
downloadvyos-strongswan-db67c87db3c9089ea8d2e14f617bf3d9e2af261f.tar.gz
vyos-strongswan-db67c87db3c9089ea8d2e14f617bf3d9e2af261f.zip
[svn-upgrade] Integrating new upstream version, strongswan (4.2.4)
Diffstat (limited to 'src/charon/plugins/eap_sim')
-rw-r--r--src/charon/plugins/eap_sim/Makefile.am13
-rw-r--r--src/charon/plugins/eap_sim/Makefile.in508
-rw-r--r--src/charon/plugins/eap_sim/eap_sim.c1149
-rw-r--r--src/charon/plugins/eap_sim/eap_sim.h111
-rw-r--r--src/charon/plugins/eap_sim/eap_sim_file.c283
-rw-r--r--src/charon/plugins/eap_sim/eap_sim_plugin.c52
-rw-r--r--src/charon/plugins/eap_sim/eap_sim_plugin.h49
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.
+
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+install-data-am: install-pluginLTLIBRARIES
+
+install-dvi: install-dvi-am
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-info: install-info-am
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-ps: install-ps-am
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+ -rm -rf ./$(DEPDIR)
+ -rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+ mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-pluginLTLIBRARIES
+
+.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_ @}*/