Migrated EAP-SIM to libsimaka, separated server/peer implementations
authorMartin Willi <martin@strongswan.org>
Tue, 20 Oct 2009 11:44:21 +0000 (13:44 +0200)
committerMartin Willi <martin@strongswan.org>
Thu, 12 Nov 2009 09:33:58 +0000 (10:33 +0100)
src/charon/plugins/eap_sim/Makefile.am
src/charon/plugins/eap_sim/eap_sim.c [deleted file]
src/charon/plugins/eap_sim/eap_sim.h [deleted file]
src/charon/plugins/eap_sim/eap_sim_peer.c [new file with mode: 0644]
src/charon/plugins/eap_sim/eap_sim_peer.h [new file with mode: 0644]
src/charon/plugins/eap_sim/eap_sim_plugin.c
src/charon/plugins/eap_sim/eap_sim_server.c [new file with mode: 0644]
src/charon/plugins/eap_sim/eap_sim_server.h [new file with mode: 0644]

index 0097ac7..d7bc9ca 100644 (file)
@@ -1,13 +1,14 @@
 
-INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/charon
+INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/charon \
+  -I$(top_srcdir)/src/libsimaka
 
-AM_CFLAGS = -rdynamic \
-       -DIPSEC_CONFDIR=\"${sysconfdir}\" \
-       -DSIM_READER_LIB=\"${sim_reader}\"
+AM_CFLAGS = -rdynamic
 
 plugin_LTLIBRARIES = libstrongswan-eap-sim.la
 
-libstrongswan_eap_sim_la_SOURCES = eap_sim.h eap_sim.c \
-  eap_sim_plugin.h eap_sim_plugin.c
+libstrongswan_eap_sim_la_SOURCES = eap_sim_plugin.h eap_sim_plugin.c \
+  eap_sim_peer.h eap_sim_peer.c \
+  eap_sim_server.h eap_sim_server.c
+libstrongswan_eap_sim_la_LIBADD = $(top_builddir)/src/libsimaka/libsimaka.a
 libstrongswan_eap_sim_la_LDFLAGS = -module -avoid-version
 
diff --git a/src/charon/plugins/eap_sim/eap_sim.c b/src/charon/plugins/eap_sim/eap_sim.c
deleted file mode 100644 (file)
index 874328d..0000000
+++ /dev/null
@@ -1,1139 +0,0 @@
-/*
- * 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 "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;
-typedef struct eap_sim_header_t eap_sim_header_t;
-typedef struct sim_attribute_header_t sim_attribute_header_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;
-
-       /**
-        * 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 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, extended MSK for further uses
-        */
-       chunk_t emsk;
-};
-
-
-/**
- * packed eap SIM header struct
- */
-struct eap_sim_header_t {
-       /** EAP code (REQUEST/RESPONSE) */
-       u_int8_t code;
-       /** unique message identifier */
-       u_int8_t identifier;
-       /** length of whole message */
-       u_int16_t length;
-       /** EAP type => EAP_SIM */
-       u_int8_t type;
-       /** SIM subtype */
-       u_int8_t subtype;
-       /** reserved bytes */
-       u_int16_t reserved;
-} __attribute__((__packed__));
-
-/**
- * packed eap SIM attribute header struct
- */
-struct sim_attribute_header_t {
-       /** attribute type */
-       u_int8_t type;
-       /** attibute length */
-       u_int8_t length;
-} __attribute__((__packed__));
-
-/** 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
-
-/* version of sim protocol we speak */
-static chunk_t version = chunk_from_chars(0x00,0x01);
-/* client error codes used in AT_CLIENT_ERROR_CODE */
-static chunk_t client_error_general = chunk_from_chars(0x00, 0x01);
-static chunk_t client_error_unsupported = chunk_from_chars(0x00, 0x02);
-static chunk_t client_error_insufficient = chunk_from_chars(0x00, 0x03);
-
-/**
- * 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[0];
-       length = message->ptr[1] * 4 - 2;
-       *message = chunk_skip(*message, 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 pos, data, message, mac_data = chunk_empty;
-       eap_payload_t *payload;
-       va_list args;
-       u_int8_t *mac_pos = NULL;
-       u_int16_t len;
-       eap_sim_header_t *hdr;
-       sim_attribute_t attr;
-       sim_attribute_header_t *ahdr;
-
-       pos = message = chunk_alloca(512);
-
-       hdr = (eap_sim_header_t*)message.ptr;
-       hdr->code = this->type;
-       hdr->identifier = identifier;
-       hdr->length = 0;
-       hdr->type = EAP_SIM;
-       hdr->subtype = type;
-       hdr->reserved = 0;
-
-       pos = chunk_skip(pos, sizeof(eap_sim_header_t));
-
-       va_start(args, type);
-       while ((attr = va_arg(args, sim_attribute_t)) != AT_END)
-       {
-               data = va_arg(args, chunk_t);
-
-               DBG3(DBG_IKE, "building %N %B", sim_attribute_names, attr, &data);
-
-               ahdr = (sim_attribute_header_t*)pos.ptr;
-               ahdr->type = attr;
-               pos = chunk_skip(pos, sizeof(sim_attribute_header_t));
-
-               switch (attr)
-               {
-                       case AT_CLIENT_ERROR_CODE:
-                       case AT_SELECTED_VERSION:
-                       {
-                               ahdr->length = data.len / 4 + 1;
-                               memcpy(pos.ptr, data.ptr, data.len);
-                               pos = chunk_skip(pos, data.len);
-                               break;
-                       }
-                       case AT_IDENTITY:
-                       case AT_VERSION_LIST:
-                       {
-                               len = data.len;
-                               /* align up to four bytes */
-                               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;
-                               }
-                               ahdr->length = data.len / 4 + 1;
-                               /* actual length in bytes */
-                               len = htons(len);
-                               memcpy(pos.ptr, &len, sizeof(len));
-                               pos = chunk_skip(pos, sizeof(len));
-                               memcpy(pos.ptr, data.ptr, data.len);
-                               pos = chunk_skip(pos, data.len);
-                               break;
-                       }
-                       case AT_RAND:
-                       case AT_NONCE_MT:
-                       {
-                               ahdr->length = data.len / 4 + 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:
-                       {
-                               ahdr->length = 5;
-                               memset(pos.ptr, 0, 2);
-                               pos = chunk_skip(pos, 2);
-                               mac_pos = pos.ptr;
-                               memset(mac_pos, 0, MAC_LEN);
-                               pos = chunk_skip(pos, MAC_LEN);
-                               mac_data = data;
-                               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;
-       len = htons(message.len);
-       memcpy(&hdr->length, &len, sizeof(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 the AT_NOTIFICATION attribute
- */
-static bool process_notification(private_eap_sim_t *this, chunk_t data,
-                                                                eap_payload_t *in, eap_payload_t **out)
-{
-       u_int16_t code = 0;
-
-       if (data.len == 2)
-       {
-               memcpy(&code, data.ptr, 2);
-               code = ntohs(code);
-       }
-       if (code > 32767)
-       {       /* success bit set */
-               DBG1(DBG_IKE, "received %N code %d",
-                        sim_attribute_names, AT_NOTIFICATION, code);
-               return FALSE;
-       }
-       DBG1(DBG_IKE, "received %N error %d",
-                sim_attribute_names, AT_NOTIFICATION, code);
-
-       *out = build_payload(this,
-                                       in->get_identifier(in), SIM_CLIENT_ERROR,
-                                       AT_CLIENT_ERROR_CODE, client_error_general,
-                                       AT_END);
-       return TRUE;
-}
-
-/**
- * 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;
-       u_int16_t len;
-
-       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 */
-                                       memcpy(&len, data.ptr, 2);
-                                       data.len = min(data.len, ntohs(len) + 2);
-                                       data = chunk_skip(data, 2);
-                                       chunk_free(&this->version_list);
-                                       this->version_list = chunk_clone(data);
-
-                                       while (data.len >= version.len)
-                                       {
-                                               if (memeq(data.ptr, version.ptr, version.len))
-                                               {
-                                                       found = TRUE;
-                                                       break;
-                                               }
-                                               data = chunk_skip(data, version.len);
-                                       }
-                               }
-                               if (!found)
-                               {
-                                       DBG1(DBG_IKE, "server does not support EAP_SIM "
-                                                "version number %#B", &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:
-                       {
-                               if (process_notification(this, data, in, out))
-                               {
-                                       return NEED_MORE;
-                               }
-                               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, 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, 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);
-}
-
-/**
- * Read a triplet from the SIM card
- */
-static bool get_card_triplet(private_eap_sim_t *this,
-                                                        char *rand, char *sres, char *kc)
-{
-       enumerator_t *enumerator;
-       sim_card_t *card;
-       bool success = FALSE;
-
-       enumerator = charon->sim->create_card_enumerator(charon->sim);
-       while (enumerator->enumerate(enumerator, &card))
-       {
-               if (card->get_triplet(card, this->peer, rand, sres, kc))
-               {
-                       success = TRUE;
-                       break;
-               }
-       }
-       enumerator->destroy(enumerator);
-       if (!success)
-       {
-               DBG1(DBG_IKE, "no SIM card found with triplets for '%Y'", this->peer);
-       }
-       return success;
-}
-
-/**
- * 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:
-                       {
-                               if (process_notification(this, data, in, out))
-                               {
-                                       return NEED_MORE;
-                               }
-                               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 >= RAND_LEN)
-       {
-               if (!get_card_triplet(this, rands.ptr, sres.ptr, kc.ptr))
-               {
-                       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;
-}
-
-/**
- * Fetch a triplet from a provider
- */
-static bool get_provider_triplet(private_eap_sim_t *this,
-                                                                char *rand, char *sres, char *kc)
-{
-       enumerator_t *enumerator;
-       sim_provider_t *provider;
-       int tried = 0;
-
-       enumerator = charon->sim->create_provider_enumerator(charon->sim);
-       while (enumerator->enumerate(enumerator, &provider))
-       {
-               if (provider->get_triplet(provider, this->peer, rand, sres, kc))
-               {
-                       enumerator->destroy(enumerator);
-                       return TRUE;
-               }
-               tried++;
-       }
-       enumerator->destroy(enumerator);
-       DBG1(DBG_IKE, "tried %d SIM providers, but none had a triplet for '%Y'",
-                tried, this->peer);
-       return FALSE;
-}
-
-/**
- * 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;
-       int i;
-
-       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, 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;
-       }
-
-       /* 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++)
-       {
-               if (!get_provider_triplet(this, rand.ptr, sres.ptr, kc.ptr))
-               {
-                       DBG1(DBG_IKE, "getting EAP-SIM triplet %d failed", i);
-                       return FAILED;
-               }
-               rands.len += RAND_LEN;
-               sreses.len += SRES_LEN;
-               kcs.len += KC_LEN;
-               rand = chunk_skip(rand, RAND_LEN);
-               sres = chunk_skip(sres, SRES_LEN);
-               kc = chunk_skip(kc, KC_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:
-                       {
-                               if (process_notification(this, data, in, out))
-                               {
-                                       return NEED_MORE;
-                               }
-                               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)
-                       {
-                               memcpy(&code, data.ptr, 2);
-                               code = ntohs(code);
-                       }
-                       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(version);
-       /* build_payloads adds padding itself */
-       *out = build_payload(this, this->identifier++, SIM_START,
-                                                AT_VERSION_LIST, 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)
-{
-       this->peer->destroy(this->peer);
-       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 = malloc_thing(private_eap_sim_t);
-       rng_t *rng;
-
-       this->nonce = chunk_empty;
-       this->sreses = chunk_empty;
-       this->peer = peer->clone(peer);
-       this->tries = MAX_TRIES;
-       this->version_list = chunk_empty;
-       this->k_auth = chunk_empty;
-       this->k_encr = chunk_empty;
-       this->msk = chunk_empty;
-       this->emsk = chunk_empty;
-       /* generate a non-zero identifier */
-       do {
-               this->identifier = random();
-       } while (!this->identifier);
-
-       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->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->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
deleted file mode 100644 (file)
index af1aa2a..0000000
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * 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>
-
-/**
- * Implementation of the eap_method_t interface using EAP-SIM.
- *
- * This EAP-SIM client implementation handles the protocol level of EAP-SIM
- * only, it does not provide triplet calculation/fetching. Other plugins may
- * provide these services using the sim_manager_t of charon.
- */
-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_peer.c b/src/charon/plugins/eap_sim/eap_sim_peer.c
new file mode 100644 (file)
index 0000000..78b7c9c
--- /dev/null
@@ -0,0 +1,524 @@
+/*
+ * Copyright (C) 2007-2009 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 "eap_sim_peer.h"
+
+#include <daemon.h>
+
+#include <simaka_message.h>
+
+/* number of tries we do authenticate */
+#define MAX_TRIES 3
+
+/* number of triplets for one authentication */
+#define TRIPLET_COUNT 3
+
+/** length of the AT_NONCE_MT/AT_NONCE_S 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
+
+typedef struct private_eap_sim_peer_t private_eap_sim_peer_t;
+
+/**
+ * Private data of an eap_sim_peer_t object.
+ */
+struct private_eap_sim_peer_t {
+
+       /**
+        * Public authenticator_t interface.
+        */
+       eap_sim_peer_t public;
+
+       /**
+        * permanent ID of peer
+        */
+       identification_t *peer;
+
+       /**
+        * RNG to create nonces, IVs
+        */
+       rng_t *rng;
+
+       /**
+        * hashing function
+        */
+       hasher_t *hasher;
+
+       /**
+        * prf
+        */
+       prf_t *prf;
+
+       /**
+        * MAC function
+        */
+       signer_t *signer;
+
+       /**
+        * encryption function
+        */
+       crypter_t *crypter;
+
+       /**
+        * how many times we try to authenticate
+        */
+       int tries;
+
+       /**
+        * version list received from server
+        */
+       chunk_t version_list;
+
+       /**
+        * Nonce value used in AT_NONCE_MT/AT_NONCE_S
+        */
+       chunk_t nonce;
+
+       /**
+        * MSK, used for EAP-SIM based IKEv2 authentication
+        */
+       chunk_t msk;
+};
+
+/* version of SIM protocol we speak */
+static chunk_t version = chunk_from_chars(0x00,0x01);
+/* client error codes used in AT_CLIENT_ERROR_CODE */
+static chunk_t client_error_general = chunk_from_chars(0x00, 0x01);
+static chunk_t client_error_unsupported = chunk_from_chars(0x00, 0x02);
+static chunk_t client_error_insufficient = chunk_from_chars(0x00, 0x03);
+
+/**
+ * Read a triplet from the SIM card
+ */
+static bool get_card_triplet(private_eap_sim_peer_t *this,
+                                                        char *rand, char *sres, char *kc)
+{
+       enumerator_t *enumerator;
+       sim_card_t *card;
+       bool success = FALSE;
+
+       enumerator = charon->sim->create_card_enumerator(charon->sim);
+       while (enumerator->enumerate(enumerator, &card))
+       {
+               if (card->get_triplet(card, this->peer, rand, sres, kc))
+               {
+                       success = TRUE;
+                       break;
+               }
+       }
+       enumerator->destroy(enumerator);
+       if (!success)
+       {
+               DBG1(DBG_IKE, "no SIM card found with triplets for '%Y'", this->peer);
+       }
+       return success;
+}
+
+/**
+ * Derive EAP keys from kc when using full authentication
+ */
+static void derive_keys_full(private_eap_sim_peer_t *this, chunk_t kcs)
+{
+       char mk[HASH_SIZE_SHA1], k_encr[KENCR_LEN], k_auth[KAUTH_LEN];
+       chunk_t tmp;
+       int i;
+
+       /* 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, version);
+       this->hasher->get_hash(this->hasher, tmp, mk);
+       DBG3(DBG_IKE, "MK = SHA1(%B\n) = %b", &tmp, mk, HASH_SIZE_SHA1);
+
+       /* K_encr | K_auth | MSK | EMSK = prf() | prf() | prf() | prf()
+        * We currently don't need EMSK, so three prf() are sufficient */
+       this->prf->set_key(this->prf, chunk_create(mk, HASH_SIZE_SHA1));
+       tmp = chunk_alloca(this->prf->get_block_size(this->prf) * 3);
+       for (i = 0; i < 3; i++)
+       {
+               this->prf->get_bytes(this->prf, chunk_empty, tmp.ptr + tmp.len / 3 * i);
+       }
+       memcpy(k_encr, tmp.ptr, KENCR_LEN);
+       tmp = chunk_skip(tmp, KENCR_LEN);
+       memcpy(k_auth, tmp.ptr, KAUTH_LEN);
+       tmp = chunk_skip(tmp, KAUTH_LEN);
+       free(this->msk.ptr);
+       this->msk = chunk_alloc(MSK_LEN);
+       memcpy(this->msk.ptr, tmp.ptr, MSK_LEN);
+       DBG3(DBG_IKE, "K_encr %b\nK_auth %b\nMSK %B",
+                k_encr, KENCR_LEN, k_auth, KAUTH_LEN, &this->msk);
+
+       this->signer->set_key(this->signer, chunk_create(k_auth, KAUTH_LEN));
+       this->crypter->set_key(this->crypter, chunk_create(k_encr, KENCR_LEN));
+}
+
+/**
+ * Send a SIM_CLIENT_ERROR
+ */
+static eap_payload_t* create_client_error(private_eap_sim_peer_t *this,
+                                                                                 u_int8_t identifier, chunk_t code)
+{
+       simaka_message_t *message;
+       eap_payload_t *out;
+
+       message = simaka_message_create(FALSE, identifier,
+                                                                       EAP_SIM, SIM_CLIENT_ERROR);
+       message->add_attribute(message, AT_CLIENT_ERROR_CODE, code);
+       out = message->generate(message, NULL, NULL, NULL, chunk_empty);
+       message->destroy(message);
+       return out;
+}
+
+/**
+ * process an EAP-SIM/Request/Start message
+ */
+static status_t process_start(private_eap_sim_peer_t *this,
+                                                         simaka_message_t *in, eap_payload_t **out)
+{
+       simaka_message_t *message;
+       enumerator_t *enumerator;
+       simaka_attribute_t type;
+       chunk_t data;
+       bool supported = FALSE;
+
+       enumerator = in->create_attribute_enumerator(in);
+       while (enumerator->enumerate(enumerator, &type, &data))
+       {
+               switch (type)
+               {
+                       case AT_VERSION_LIST:
+                       {
+                               free(this->version_list.ptr);
+                               this->version_list = chunk_clone(data);
+                               while (data.len >= version.len)
+                               {
+                                       if (memeq(data.ptr, version.ptr, version.len))
+                                       {
+                                               supported = TRUE;
+                                               break;
+                                       }
+                               }
+                               break;
+                       }
+                       default:
+                               DBG1(DBG_IKE, "ignoring EAP-SIM attribute %N",
+                                        simaka_attribute_names, type);
+                               break;
+               }
+       }
+       enumerator->destroy(enumerator);
+
+       if (!supported)
+       {
+               DBG1(DBG_IKE, "server does not support EAP-SIM version number 1");
+               *out = create_client_error(this, in->get_identifier(in),
+                                                                  client_error_unsupported);
+               return NEED_MORE;
+       }
+
+       /* generate AT_NONCE_MT value */
+       free(this->nonce.ptr);
+       this->rng->allocate_bytes(this->rng, NONCE_LEN, &this->nonce);
+
+       message = simaka_message_create(FALSE, in->get_identifier(in),
+                                                                       EAP_SIM, SIM_START);
+       message->add_attribute(message, AT_SELECTED_VERSION, version);
+       message->add_attribute(message, AT_NONCE_MT, this->nonce);
+       *out = message->generate(message, NULL, NULL, NULL, chunk_empty);
+       message->destroy(message);
+
+       return NEED_MORE;
+}
+
+/**
+ * process an EAP-SIM/Request/Challenge message
+ */
+static status_t process_challenge(private_eap_sim_peer_t *this,
+                                                                 simaka_message_t *in, eap_payload_t **out)
+{
+       simaka_message_t *message;
+       enumerator_t *enumerator;
+       simaka_attribute_t type;
+       chunk_t data, rands = chunk_empty, kcs, kc, sreses, sres;
+
+       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;
+       }
+
+       enumerator = in->create_attribute_enumerator(in);
+       while (enumerator->enumerate(enumerator, &type, &data))
+       {
+               switch (type)
+               {
+                       case AT_RAND:
+                       {
+                               rands = data;
+                               break;
+                       }
+                       default:
+                               DBG1(DBG_IKE, "ignoring EAP-SIM attribute %N",
+                                        simaka_attribute_names, type);
+                               break;
+               }
+       }
+       enumerator->destroy(enumerator);
+
+       /* 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 = create_client_error(this, in->get_identifier(in),
+                                                                  client_error_insufficient);
+               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 >= RAND_LEN)
+       {
+               if (!get_card_triplet(this, rands.ptr, sres.ptr, kc.ptr))
+               {
+                       DBG1(DBG_IKE, "unable to get EAP-SIM triplet");
+                       *out = create_client_error(this, in->get_identifier(in),
+                                                                          client_error_general);
+                       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_full(this, kcs);
+
+       /* verify AT_MAC attribute, signature is over "EAP packet | NONCE_MT"  */
+       if (!in->verify(in, this->signer, this->nonce))
+       {
+               DBG1(DBG_IKE, "AT_MAC verification failed");
+               *out = create_client_error(this, in->get_identifier(in),
+                                                                  client_error_general);
+               return NEED_MORE;
+       }
+
+       /* build response with AT_MAC, built over "EAP packet | n*SRES" */
+       message = simaka_message_create(FALSE, in->get_identifier(in),
+                                                                       EAP_SIM, SIM_CHALLENGE);
+       *out = message->generate(message, NULL, NULL, this->signer, sreses);
+       message->destroy(message);
+       return NEED_MORE;
+}
+
+/**
+ * process an EAP-SIM/Request/Notification message
+ */
+static status_t process_notification(private_eap_sim_peer_t *this,
+                                                                        simaka_message_t *in, eap_payload_t **out)
+{
+       simaka_message_t *message;
+       enumerator_t *enumerator;
+       simaka_attribute_t type;
+       chunk_t data;
+       bool success = TRUE;
+
+       enumerator = in->create_attribute_enumerator(in);
+       while (enumerator->enumerate(enumerator, &type, &data))
+       {
+               if (type == AT_NOTIFICATION)
+               {
+                       /* test success bit */
+                       if (!(data.ptr[0] & 0x80))
+                       {
+                               success = FALSE;
+                               DBG1(DBG_IKE, "received EAP-SIM notification error %#B", &data);
+                       }
+                       else
+                       {
+                               DBG1(DBG_IKE, "received EAP-SIM notification code %#B", &data);
+                       }
+               }
+       }
+       enumerator->destroy(enumerator);
+
+       if (success)
+       {       /* empty notification reply */
+               message = simaka_message_create(FALSE, in->get_identifier(in),
+                                                                               EAP_SIM, SIM_NOTIFICATION);
+               *out = message->generate(message, NULL, NULL, NULL, chunk_empty);
+               message->destroy(message);
+       }
+       else
+       {
+               *out = create_client_error(this, in->get_identifier(in),
+                                                                  client_error_general);
+       }
+       return NEED_MORE;
+}
+
+/**
+ * Implementation of eap_method_t.process
+ */
+static status_t process(private_eap_sim_peer_t *this,
+                                               eap_payload_t *in, eap_payload_t **out)
+{
+       simaka_message_t *message;
+       status_t status;
+
+       message = simaka_message_create_from_payload(in);
+       if (!message)
+       {
+               *out = create_client_error(this, in->get_identifier(in),
+                                                                  client_error_general);
+               return NEED_MORE;
+       }
+       if (!message->parse(message, this->crypter))
+       {
+               message->destroy(message);
+               *out = create_client_error(this, in->get_identifier(in),
+                                                                  client_error_general);
+               return NEED_MORE;
+       }
+       switch (message->get_subtype(message))
+       {
+               case SIM_START:
+                       status = process_start(this, message, out);
+                       break;
+               case SIM_CHALLENGE:
+                       status = process_challenge(this, message, out);
+                       break;
+               case SIM_NOTIFICATION:
+                       status = process_notification(this, message, out);
+                       break;
+               default:
+                       *out = create_client_error(this, in->get_identifier(in),
+                                                                          client_error_general);
+                       status = NEED_MORE;
+                       break;
+       }
+       message->destroy(message);
+       return status;
+}
+
+/**
+ * Implementation of eap_method_t.initiate
+ */
+static status_t initiate(private_eap_sim_peer_t *this, eap_payload_t **out)
+{
+       /* peer never initiates */
+       return FAILED;
+}
+
+/**
+ * Implementation of eap_method_t.get_type.
+ */
+static eap_type_t get_type(private_eap_sim_peer_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_peer_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_peer_t *this)
+{
+       return TRUE;
+}
+
+/**
+ * Implementation of eap_method_t.destroy.
+ */
+static void destroy(private_eap_sim_peer_t *this)
+{
+       this->peer->destroy(this->peer);
+       DESTROY_IF(this->rng);
+       DESTROY_IF(this->hasher);
+       DESTROY_IF(this->prf);
+       DESTROY_IF(this->signer);
+       DESTROY_IF(this->crypter);
+       free(this->version_list.ptr);
+       free(this->nonce.ptr);
+       free(this->msk.ptr);
+       free(this);
+}
+
+/*
+ * Described in header.
+ */
+eap_sim_peer_t *eap_sim_peer_create(identification_t *server,
+                                                                       identification_t *peer)
+{
+       private_eap_sim_peer_t *this = malloc_thing(private_eap_sim_peer_t);
+
+       this->peer = peer->clone(peer);
+       this->tries = MAX_TRIES;
+       this->version_list = chunk_empty;
+       this->nonce = chunk_empty;
+       this->msk = chunk_empty;
+
+       this->public.interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate;
+       this->public.interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process;
+       this->public.interface.get_type = (eap_type_t(*)(eap_method_t*,u_int32_t*))get_type;
+       this->public.interface.is_mutual = (bool(*)(eap_method_t*))is_mutual;
+       this->public.interface.get_msk = (status_t(*)(eap_method_t*,chunk_t*))get_msk;
+       this->public.interface.destroy = (void(*)(eap_method_t*))destroy;
+
+       this->rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+       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);
+       this->crypter = lib->crypto->create_crypter(lib->crypto, ENCR_AES_CBC, 16);
+       if (!this->rng || !this->hasher || !this->prf ||
+               !this->signer || !this->crypter)
+       {
+               DBG1(DBG_IKE, "unable to use EAP-SIM, missing algorithms");
+               destroy(this);
+               return NULL;
+       }
+       return &this->public;
+}
+
diff --git a/src/charon/plugins/eap_sim/eap_sim_peer.h b/src/charon/plugins/eap_sim/eap_sim_peer.h
new file mode 100644 (file)
index 0000000..85befa6
--- /dev/null
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2009 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_peer eap_sim_peer
+ * @{ @ingroup eap_sim
+ */
+
+#ifndef EAP_SIM_PEER_H_
+#define EAP_SIM_PEER_H_
+
+#include <sa/authenticators/eap/eap_method.h>
+
+typedef struct eap_sim_peer_t eap_sim_peer_t;
+
+/**
+ * EAP-SIM peer implementation.
+ *
+ * This EAP-SIM module uses sim_card_t implementations for triplet calculation,
+ * found via the eap_sim_manager_t.
+ */
+struct eap_sim_peer_t {
+
+       /**
+        * Implemented eap_method_t interface.
+        */
+       eap_method_t interface;
+
+       /**
+        * Destroy a eap_sim_peer_t.
+        */
+       void (*destroy)(eap_sim_peer_t *this);
+};
+
+/**
+ * Creates the EAP method EAP-SIM acting as peer.
+ *
+ * @param server       ID of the EAP server
+ * @param peer         ID of the EAP peer
+ * @return                     eap_sim_t object
+ */
+eap_sim_peer_t *eap_sim_peer_create(identification_t *server,
+                                                                       identification_t *peer);
+
+#endif /* EAP_SIM_PEER_H_ @}*/
index 6a68783..1d2b9cf 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008 Martin Willi
+ * Copyright (C) 2008-2009 Martin Willi
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -15,7 +15,8 @@
 
 #include "eap_sim_plugin.h"
 
-#include "eap_sim.h"
+#include "eap_sim_server.h"
+#include "eap_sim_peer.h"
 
 #include <daemon.h>
 
@@ -25,9 +26,9 @@
 static void destroy(eap_sim_plugin_t *this)
 {
        charon->eap->remove_method(charon->eap,
-                                                          (eap_constructor_t)eap_sim_create_server);
+                                                          (eap_constructor_t)eap_sim_server_create);
        charon->eap->remove_method(charon->eap,
-                                                          (eap_constructor_t)eap_sim_create_peer);
+                                                          (eap_constructor_t)eap_sim_peer_create);
        free(this);
 }
 
@@ -41,9 +42,9 @@ plugin_t *plugin_create()
        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);
+                                                       (eap_constructor_t)eap_sim_server_create);
        charon->eap->add_method(charon->eap, EAP_SIM, 0, EAP_PEER,
-                                                       (eap_constructor_t)eap_sim_create_peer);
+                                                       (eap_constructor_t)eap_sim_peer_create);
 
        return &this->plugin;
 }
diff --git a/src/charon/plugins/eap_sim/eap_sim_server.c b/src/charon/plugins/eap_sim/eap_sim_server.c
new file mode 100644 (file)
index 0000000..9b9bc9d
--- /dev/null
@@ -0,0 +1,432 @@
+/*
+ * Copyright (C) 2007-2009 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 "eap_sim_server.h"
+
+#include <daemon.h>
+
+#include <simaka_message.h>
+
+/* number of triplets for one authentication */
+#define TRIPLET_COUNT 3
+
+/** length of the AT_NONCE_MT/AT_NONCE_S 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
+
+typedef struct private_eap_sim_server_t private_eap_sim_server_t;
+
+/**
+ * Private data of an eap_sim_server_t object.
+ */
+struct private_eap_sim_server_t {
+
+       /**
+        * Public authenticator_t interface.
+        */
+       eap_sim_server_t public;
+
+       /**
+        * permanent ID of peer
+        */
+       identification_t *peer;
+
+       /**
+        * Random number generator for nonce, IVs
+        */
+       rng_t *rng;
+
+       /**
+        * hashing function
+        */
+       hasher_t *hasher;
+
+       /**
+        * prf
+        */
+       prf_t *prf;
+
+       /**
+        * MAC function
+        */
+       signer_t *signer;
+
+       /**
+        * encryption function
+        */
+       crypter_t *crypter;
+
+       /**
+        * unique EAP identifier
+        */
+       u_int8_t identifier;
+
+       /**
+        * concatenated SRES values
+        */
+       chunk_t sreses;
+
+       /**
+        * MSK, used for EAP-SIM based IKEv2 authentication
+        */
+       chunk_t msk;
+};
+
+/**
+ * Fetch a triplet from a provider
+ */
+static bool get_provider_triplet(private_eap_sim_server_t *this,
+                                                                char *rand, char *sres, char *kc)
+{
+       enumerator_t *enumerator;
+       sim_provider_t *provider;
+       int tried = 0;
+
+       enumerator = charon->sim->create_provider_enumerator(charon->sim);
+       while (enumerator->enumerate(enumerator, &provider))
+       {
+               if (provider->get_triplet(provider, this->peer, rand, sres, kc))
+               {
+                       enumerator->destroy(enumerator);
+                       return TRUE;
+               }
+               tried++;
+       }
+       enumerator->destroy(enumerator);
+       DBG1(DBG_IKE, "tried %d SIM providers, but none had a triplet for '%Y'",
+                tried, this->peer);
+       return FALSE;
+}
+
+/**
+ * Derive EAP keys from kc when using full authentication
+ */
+static void derive_keys_full(private_eap_sim_server_t *this,
+                                                        chunk_t kcs, chunk_t nonce)
+{
+       char mk[HASH_SIZE_SHA1], k_encr[KENCR_LEN], k_auth[KAUTH_LEN];
+       chunk_t tmp;
+       int i;
+
+       /* MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
+       tmp = chunk_cata("ccccc", this->peer->get_encoding(this->peer),
+                                        kcs, nonce, version, version);
+       this->hasher->get_hash(this->hasher, tmp, mk);
+       DBG3(DBG_IKE, "MK = SHA1(%B\n) = %b", &tmp, mk, HASH_SIZE_SHA1);
+
+       /* K_encr | K_auth | MSK | EMSK = prf() | prf() | prf() | prf()
+        * We currently don't need EMSK, so three prf() are sufficient */
+       this->prf->set_key(this->prf, chunk_create(mk, HASH_SIZE_SHA1));
+       tmp = chunk_alloca(this->prf->get_block_size(this->prf) * 3);
+       for (i = 0; i < 3; i++)
+       {
+               this->prf->get_bytes(this->prf, chunk_empty, tmp.ptr + tmp.len / 3 * i);
+       }
+       memcpy(k_encr, tmp.ptr, KENCR_LEN);
+       tmp = chunk_skip(tmp, KENCR_LEN);
+       memcpy(k_auth, tmp.ptr, KAUTH_LEN);
+       tmp = chunk_skip(tmp, KAUTH_LEN);
+       free(this->msk.ptr);
+       this->msk = chunk_alloc(MSK_LEN);
+       memcpy(this->msk.ptr, tmp.ptr, MSK_LEN);
+       DBG3(DBG_IKE, "K_encr %b\nK_auth %b\nMSK %B",
+                k_encr, KENCR_LEN, k_auth, KAUTH_LEN, &this->msk);
+
+       this->signer->set_key(this->signer, chunk_create(k_auth, KAUTH_LEN));
+       this->crypter->set_key(this->crypter, chunk_create(k_encr, KENCR_LEN));
+}
+
+/**
+ * process an EAP-SIM/Response/Start message
+ */
+static status_t process_start(private_eap_sim_server_t *this,
+                                                         simaka_message_t *in, eap_payload_t **out)
+{
+       simaka_message_t *message;
+       enumerator_t *enumerator;
+       simaka_attribute_t type;
+       chunk_t data, rands, rand, kcs, kc, sreses, sres, nonce = chunk_empty;
+       bool supported = FALSE;
+       int i;
+
+       enumerator = in->create_attribute_enumerator(in);
+       while (enumerator->enumerate(enumerator, &type, &data))
+       {
+               switch (type)
+               {
+                       case AT_NONCE_MT:
+                               nonce = data;
+                               break;
+                       case AT_SELECTED_VERSION:
+                               if (chunk_equals(data, version))
+                               {
+                                       supported = TRUE;
+                               }
+                               break;
+                       default:
+                               DBG1(DBG_IKE, "ignoring EAP-SIM attribute %N",
+                                        simaka_attribute_names, type);
+                               break;
+               }
+       }
+       enumerator->destroy(enumerator);
+
+       if (!supported || !nonce.len)
+       {
+               DBG1(DBG_IKE, "received incomplete EAP-SIM/Response/Start");
+               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 = kcs.len = sreses.len = 0;
+       for (i = 0; i < TRIPLET_COUNT; i++)
+       {
+               if (!get_provider_triplet(this, rand.ptr, sres.ptr, kc.ptr))
+               {
+                       DBG1(DBG_IKE, "getting EAP-SIM triplet %d failed", i);
+                       return FAILED;
+               }
+               rands.len += RAND_LEN;
+               sreses.len += SRES_LEN;
+               kcs.len += KC_LEN;
+               rand = chunk_skip(rand, RAND_LEN);
+               sres = chunk_skip(sres, SRES_LEN);
+               kc = chunk_skip(kc, KC_LEN);
+       }
+       free(this->sreses.ptr);
+       this->sreses = chunk_clone(sreses);
+
+       derive_keys_full(this, kcs, nonce);
+
+       /* build response with AT_MAC, built over "EAP packet | NONCE_MT" */
+       message = simaka_message_create(TRUE, this->identifier++,
+                                                                       EAP_SIM, SIM_CHALLENGE);
+       message->add_attribute(message, AT_RAND, rands);
+       *out = message->generate(message, NULL, NULL, this->signer, nonce);
+       message->destroy(message);
+       return NEED_MORE;
+}
+
+/**
+ * process an EAP-SIM/Response/Challenge message
+ */
+static status_t process_challenge(private_eap_sim_server_t *this,
+                                                                 simaka_message_t *in, eap_payload_t **out)
+{
+       enumerator_t *enumerator;
+       simaka_attribute_t type;
+       chunk_t data;
+
+       enumerator = in->create_attribute_enumerator(in);
+       while (enumerator->enumerate(enumerator, &type, &data))
+       {
+               DBG1(DBG_IKE, "ignoring EAP-SIM attribute %N",
+                        simaka_attribute_names, type);
+       }
+       enumerator->destroy(enumerator);
+
+       /* verify AT_MAC attribute, signature is over "EAP packet | n*SRES"  */
+       if (!in->verify(in, this->signer, this->sreses))
+       {
+               DBG1(DBG_IKE, "AT_MAC verification failed");
+               return FAILED;
+       }
+       return SUCCESS;
+}
+
+/**
+ * EAP-SIM/Response/ClientErrorCode message
+ */
+static status_t process_client_error(private_eap_sim_server_t *this,
+                                                                        simaka_message_t *in, eap_payload_t **out)
+{
+       enumerator_t *enumerator;
+       simaka_attribute_t type;
+       chunk_t data;
+
+       enumerator = in->create_attribute_enumerator(in);
+       while (enumerator->enumerate(enumerator, &type, &data))
+       {
+               if (type == AT_CLIENT_ERROR_CODE)
+               {
+                       DBG1(DBG_IKE, "received EAP-SIM client error code %#B", &data);
+               }
+               else
+               {
+                       DBG1(DBG_IKE, "ignoring EAP-SIM attribute %N",
+                                simaka_attribute_names, type);
+               }
+       }
+       enumerator->destroy(enumerator);
+       return FAILED;
+}
+
+/**
+ * Implementation of eap_method_t.process
+ */
+static status_t process(private_eap_sim_server_t *this,
+                                               eap_payload_t *in, eap_payload_t **out)
+{
+       simaka_message_t *message;
+       status_t status;
+
+       message = simaka_message_create_from_payload(in);
+       if (!message)
+       {
+               return FAILED;
+       }
+       if (!message->parse(message, this->crypter))
+       {
+               message->destroy(message);
+               return FAILED;
+       }
+       switch (message->get_subtype(message))
+       {
+               case SIM_START:
+                       status = process_start(this, message, out);
+                       break;
+               case SIM_CHALLENGE:
+                       status = process_challenge(this, message, out);
+                       break;
+               case SIM_CLIENT_ERROR:
+                       status = process_client_error(this, message, out);
+                       break;
+               default:
+                       DBG1(DBG_IKE, "unable to process EAP-SIM subtype %N",
+                                simaka_subtype_names, message->get_subtype(message));
+                       status = FAILED;
+                       break;
+       }
+       message->destroy(message);
+       return status;
+}
+
+/**
+ * Implementation of eap_method_t.initiate
+ */
+static status_t initiate(private_eap_sim_server_t *this, eap_payload_t **out)
+{
+       simaka_message_t *message;
+
+       message = simaka_message_create(TRUE, this->identifier++,
+                                                                       EAP_SIM, SIM_START);
+       message->add_attribute(message, AT_VERSION_LIST, version);
+       *out = message->generate(message, NULL, NULL, NULL, chunk_empty);
+       message->destroy(message);
+       return NEED_MORE;
+}
+
+/**
+ * Implementation of eap_method_t.get_type.
+ */
+static eap_type_t get_type(private_eap_sim_server_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_server_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_server_t *this)
+{
+       return TRUE;
+}
+
+/**
+ * Implementation of eap_method_t.destroy.
+ */
+static void destroy(private_eap_sim_server_t *this)
+{
+       this->peer->destroy(this->peer);
+       DESTROY_IF(this->rng);
+       DESTROY_IF(this->hasher);
+       DESTROY_IF(this->prf);
+       DESTROY_IF(this->signer);
+       DESTROY_IF(this->crypter);
+       free(this->sreses.ptr);
+       free(this->msk.ptr);
+       free(this);
+}
+
+/*
+ * Described in header.
+ */
+eap_sim_server_t *eap_sim_server_create(identification_t *server,
+                                                                               identification_t *peer)
+{
+       private_eap_sim_server_t *this = malloc_thing(private_eap_sim_server_t);
+
+       this->peer = peer->clone(peer);
+       this->sreses = chunk_empty;
+       this->msk = chunk_empty;
+       /* generate a non-zero identifier */
+       do {
+               this->identifier = random();
+       } while (!this->identifier);
+
+       this->public.interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate;
+       this->public.interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process;
+       this->public.interface.get_type = (eap_type_t(*)(eap_method_t*,u_int32_t*))get_type;
+       this->public.interface.is_mutual = (bool(*)(eap_method_t*))is_mutual;
+       this->public.interface.get_msk = (status_t(*)(eap_method_t*,chunk_t*))get_msk;
+       this->public.interface.destroy = (void(*)(eap_method_t*))destroy;
+
+       this->rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+       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);
+       this->crypter = lib->crypto->create_crypter(lib->crypto, ENCR_AES_CBC, 16);
+       if (!this->rng || !this->hasher || !this->prf ||
+               !this->signer || !this->crypter)
+       {
+               DBG1(DBG_IKE, "unable to use EAP-SIM, missing algorithms");
+               destroy(this);
+               return NULL;
+       }
+       return &this->public;
+}
+
diff --git a/src/charon/plugins/eap_sim/eap_sim_server.h b/src/charon/plugins/eap_sim/eap_sim_server.h
new file mode 100644 (file)
index 0000000..d9dafb2
--- /dev/null
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2009 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_server eap_sim_server
+ * @{ @ingroup eap_sim
+ */
+
+#ifndef EAP_SIM_SERVER_H_
+#define EAP_SIM_SERVER_H_
+
+#include <sa/authenticators/eap/eap_method.h>
+
+typedef struct eap_sim_server_t eap_sim_server_t;
+
+/**
+ * EAP-SIM server implementation.
+ *
+ * This EAP-SIM module uses sim_provider_t implementations for triplet
+ * calculation, found via the eap_sim_manager_t.
+ */
+struct eap_sim_server_t {
+
+       /**
+        * Implemented eap_method_t interface.
+        */
+       eap_method_t interface;
+
+       /**
+        * Destroy a eap_sim_server_t.
+        */
+       void (*destroy)(eap_sim_server_t *this);
+};
+
+/**
+ * Creates the EAP method EAP-SIM acting as server.
+ *
+ * @param server       ID of the EAP server
+ * @param peer         ID of the EAP peer
+ * @return                     eap_sim_t object
+ */
+eap_sim_server_t *eap_sim_server_create(identification_t *server,
+                                                                               identification_t *peer);
+
+#endif /* EAP_SIM_SERVER_H_ @}*/