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Migrated EAP-SIM to libsimaka, separated server/peer implementations

This commit is contained in:
Martin Willi 2009-10-20 13:44:21 +02:00
parent f8330d0395
commit ac4dd5439b
7 changed files with 1047 additions and 1175 deletions
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13
src/charon/plugins/eap_sim/Makefile.am
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@ -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

1139
src/charon/plugins/eap_sim/eap_sim.c
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524
src/charon/plugins/eap_sim/eap_sim_peer.c Normal file
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@ -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;
}

57
src/charon/plugins/eap_sim/eap_sim_peer.h Normal file
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@ -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_ @}*/

13
src/charon/plugins/eap_sim/eap_sim_plugin.c
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@ -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;
}

432
src/charon/plugins/eap_sim/eap_sim_server.c Normal file
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@ -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;
}

44
src/charon/plugins/eap_sim/eap_sim.h → src/charon/plugins/eap_sim/eap_sim_server.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2007-2008 Martin Willi
* Copyright (C) 2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
@ -14,48 +14,44 @@
*/
/**
* @defgroup eap_sim_i eap_sim
* @defgroup eap_sim_server eap_sim_server
* @{ @ingroup eap_sim
*/
#ifndef EAP_SIM_H_
#define EAP_SIM_H_
typedef struct eap_sim_t eap_sim_t;
#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;
/**
* Implementation of the eap_method_t interface using EAP-SIM.
* EAP-SIM server implementation.
*
* 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.
* This EAP-SIM module uses sim_provider_t implementations for triplet
* calculation, found via the eap_sim_manager_t.
*/
struct eap_sim_t {
struct eap_sim_server_t {
/**
* Implemented eap_method_t interface.
*/
eap_method_t eap_method_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 client
* @param peer ID of the EAP peer
* @return eap_sim_t object
*/
eap_sim_t *eap_sim_create_server(identification_t *server, identification_t *peer);
eap_sim_server_t *eap_sim_server_create(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_ @}*/
#endif /* EAP_SIM_SERVER_H_ @}*/