-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
+++ /dev/null
-/*
- * 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);
-}
-
--- /dev/null
+/*
+ * 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;
+}
+
--- /dev/null
+/*
+ * 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_ @}*/
/*
- * 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
#include "eap_sim_plugin.h"
-#include "eap_sim.h"
+#include "eap_sim_server.h"
+#include "eap_sim_peer.h"
#include <daemon.h>
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);
}
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;
}
--- /dev/null
+/*
+ * 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;
+}
+
/*
- * 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
*/
/**
- * @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
- * @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
+ * @param peer ID of the EAP peer
* @return eap_sim_t object
*/
-eap_sim_t *eap_sim_create_peer(identification_t *server, identification_t *peer);
+eap_sim_server_t *eap_sim_server_create(identification_t *server,
+ identification_t *peer);
-#endif /** EAP_SIM_H_ @}*/
+#endif /* EAP_SIM_SERVER_H_ @}*/
projects / thirdparty / strongswan.git / commitdiff
