diff options
Diffstat (limited to 'src/libcharon/plugins/eap_aka_3gpp2')
10 files changed, 1766 insertions, 0 deletions
diff --git a/src/libcharon/plugins/eap_aka_3gpp2/Makefile.am b/src/libcharon/plugins/eap_aka_3gpp2/Makefile.am new file mode 100644 index 000000000..598799e2a --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/Makefile.am @@ -0,0 +1,20 @@ + +INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libhydra \ + -I$(top_srcdir)/src/libcharon + +AM_CFLAGS = -rdynamic + +if MONOLITHIC +noinst_LTLIBRARIES = libstrongswan-eap-aka-3gpp2.la +else +plugin_LTLIBRARIES = libstrongswan-eap-aka-3gpp2.la +endif + +libstrongswan_eap_aka_3gpp2_la_SOURCES = \ + eap_aka_3gpp2_plugin.h eap_aka_3gpp2_plugin.c \ + eap_aka_3gpp2_card.h eap_aka_3gpp2_card.c \ + eap_aka_3gpp2_provider.h eap_aka_3gpp2_provider.c \ + eap_aka_3gpp2_functions.h eap_aka_3gpp2_functions.c + +libstrongswan_eap_aka_3gpp2_la_LDFLAGS = -module -avoid-version +libstrongswan_eap_aka_3gpp2_la_LIBADD = -lgmp diff --git a/src/libcharon/plugins/eap_aka_3gpp2/Makefile.in b/src/libcharon/plugins/eap_aka_3gpp2/Makefile.in new file 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--git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_card.c b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_card.c new file mode 100644 index 000000000..5c0fe38ad --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_card.c @@ -0,0 +1,178 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2_card.h" + +#include <daemon.h> + +typedef struct private_eap_aka_3gpp2_card_t private_eap_aka_3gpp2_card_t; + +/** + * Private data of an eap_aka_3gpp2_card_t object. + */ +struct private_eap_aka_3gpp2_card_t { + + /** + * Public eap_aka_3gpp2_card_t interface. + */ + eap_aka_3gpp2_card_t public; + + /** + * AKA functions + */ + eap_aka_3gpp2_functions_t *f; + + /** + * do sequence number checking? + */ + bool seq_check; + + /** + * SQN stored in this pseudo-USIM + */ + char sqn[AKA_SQN_LEN]; +}; + +/** + * Functions from eap_aka_3gpp2_provider.c + */ +bool eap_aka_3gpp2_get_k(identification_t *id, char k[AKA_K_LEN]); +void eap_aka_3gpp2_get_sqn(char sqn[AKA_SQN_LEN], int offset); + +/** + * Implementation of sim_card_t.get_quintuplet + */ +static status_t get_quintuplet(private_eap_aka_3gpp2_card_t *this, + identification_t *id, char rand[AKA_RAND_LEN], + char autn[AKA_AUTN_LEN], char ck[AKA_CK_LEN], + char ik[AKA_IK_LEN], char res[AKA_RES_MAX], + int *res_len) +{ + char *amf, *mac; + char k[AKA_K_LEN], ak[AKA_AK_LEN], sqn[AKA_SQN_LEN], xmac[AKA_MAC_LEN]; + + if (!eap_aka_3gpp2_get_k(id, k)) + { + DBG1(DBG_IKE, "no EAP key found for %Y to authenticate with AKA", id); + return FAILED; + } + + /* AUTN = SQN xor AK | AMF | MAC */ + DBG3(DBG_IKE, "received autn %b", autn, AKA_AUTN_LEN); + DBG3(DBG_IKE, "using K %b", k, AKA_K_LEN); + DBG3(DBG_IKE, "using rand %b", rand, AKA_RAND_LEN); + memcpy(sqn, autn, AKA_SQN_LEN); + amf = autn + AKA_SQN_LEN; + mac = autn + AKA_SQN_LEN + AKA_AMF_LEN; + + /* XOR anonymity key AK into SQN to decrypt it */ + this->f->f5(this->f, k, rand, ak); + DBG3(DBG_IKE, "using ak %b", ak, AKA_AK_LEN); + memxor(sqn, ak, AKA_SQN_LEN); + DBG3(DBG_IKE, "using sqn %b", sqn, AKA_SQN_LEN); + + /* calculate expected MAC and compare against received one */ + this->f->f1(this->f, k, rand, sqn, amf, xmac); + if (!memeq(mac, xmac, AKA_MAC_LEN)) + { + DBG1(DBG_IKE, "received MAC does not match XMAC"); + DBG3(DBG_IKE, "MAC %b\nXMAC %b", mac, AKA_MAC_LEN, xmac, AKA_MAC_LEN); + return FAILED; + } + + if (this->seq_check && memcmp(this->sqn, sqn, AKA_SQN_LEN) >= 0) + { + DBG3(DBG_IKE, "received SQN %b\ncurrent SQN %b", + sqn, AKA_SQN_LEN, this->sqn, AKA_SQN_LEN); + return INVALID_STATE; + } + + /* update stored SQN to the received one */ + memcpy(this->sqn, sqn, AKA_SQN_LEN); + + /* CK/IK */ + this->f->f3(this->f, k, rand, ck); + this->f->f4(this->f, k, rand, ik); + /* calculate RES */ + this->f->f2(this->f, k, rand, res); + *res_len = AKA_RES_MAX; + + return SUCCESS; +} + +/** + * Implementation of sim_card_t.resync + */ +static bool resync(private_eap_aka_3gpp2_card_t *this, identification_t *id, + char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]) +{ + char amf[AKA_AMF_LEN], k[AKA_K_LEN], aks[AKA_AK_LEN], macs[AKA_MAC_LEN]; + + if (!eap_aka_3gpp2_get_k(id, k)) + { + DBG1(DBG_IKE, "no EAP key found for %Y to resync AKA", id); + return FALSE; + } + + /* AMF is set to zero in resync */ + memset(amf, 0, AKA_AMF_LEN); + this->f->f5star(this->f, k, rand, aks); + this->f->f1star(this->f, k, rand, this->sqn, amf, macs); + /* AUTS = SQN xor AKS | MACS */ + memcpy(auts, this->sqn, AKA_SQN_LEN); + memxor(auts, aks, AKA_AK_LEN); + memcpy(auts + AKA_AK_LEN, macs, AKA_MAC_LEN); + + return TRUE; +} + +/** + * Implementation of eap_aka_3gpp2_card_t.destroy. + */ +static void destroy(private_eap_aka_3gpp2_card_t *this) +{ + free(this); +} + +/** + * See header + */ +eap_aka_3gpp2_card_t *eap_aka_3gpp2_card_create(eap_aka_3gpp2_functions_t *f) +{ + private_eap_aka_3gpp2_card_t *this = malloc_thing(private_eap_aka_3gpp2_card_t); + + this->public.card.get_triplet = (bool(*)(sim_card_t*, identification_t *id, char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN], char kc[SIM_KC_LEN]))return_false; + this->public.card.get_quintuplet = (status_t(*)(sim_card_t*, identification_t *id, char rand[AKA_RAND_LEN], char autn[AKA_AUTN_LEN], char ck[AKA_CK_LEN], char ik[AKA_IK_LEN], char res[AKA_RES_MAX], int *res_len))get_quintuplet; + this->public.card.resync = (bool(*)(sim_card_t*, identification_t *id, char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]))resync; + this->public.card.get_pseudonym = (identification_t*(*)(sim_card_t*, identification_t *id))return_null; + this->public.card.set_pseudonym = (void(*)(sim_card_t*, identification_t *id, identification_t *pseudonym))nop; + this->public.card.get_reauth = (identification_t*(*)(sim_card_t*, identification_t *id, char mk[HASH_SIZE_SHA1], u_int16_t *counter))return_null; + this->public.card.set_reauth = (void(*)(sim_card_t*, identification_t *id, identification_t* next, char mk[HASH_SIZE_SHA1], u_int16_t counter))nop; + this->public.destroy = (void(*)(eap_aka_3gpp2_card_t*))destroy; + + this->f = f; + this->seq_check = lib->settings->get_bool(lib->settings, + "charon.plugins.eap-aka-3gpp2.seq_check", +#ifdef SEQ_CHECK /* handle legacy compile time configuration as default */ + TRUE); +#else /* !SEQ_CHECK */ + FALSE); +#endif /* SEQ_CHECK */ + + eap_aka_3gpp2_get_sqn(this->sqn, 0); + + return &this->public; +} + diff --git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_card.h b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_card.h new file mode 100644 index 000000000..b95bc52af --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_card.h @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2_card eap_aka_3gpp2_card + * @{ @ingroup eap_aka_3gpp2 + */ + +#ifndef EAP_AKA_3GPP2_CARD_H_ +#define EAP_AKA_3GPP2_CARD_H_ + +#include "eap_aka_3gpp2_functions.h" + +#include <sa/authenticators/eap/sim_manager.h> + +typedef struct eap_aka_3gpp2_card_t eap_aka_3gpp2_card_t; + +/** + * SIM card implementation using a set of AKA functions. + */ +struct eap_aka_3gpp2_card_t { + + /** + * Implements sim_card_t interface + */ + sim_card_t card; + + /** + * Destroy a eap_aka_3gpp2_card_t. + */ + void (*destroy)(eap_aka_3gpp2_card_t *this); +}; + +/** + * Create a eap_aka_3gpp2_card instance. + * + * @param f AKA functions + */ +eap_aka_3gpp2_card_t *eap_aka_3gpp2_card_create(eap_aka_3gpp2_functions_t *f); + +#endif /** EAP_AKA_3GPP2_CARD_H_ @}*/ diff --git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_functions.c b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_functions.c new file mode 100644 index 000000000..1d3d246d1 --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_functions.c @@ -0,0 +1,394 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2_functions.h" + +#include <gmp.h> +#include <limits.h> + +#include <daemon.h> + +typedef struct private_eap_aka_3gpp2_functions_t private_eap_aka_3gpp2_functions_t; + +/** + * Private data of an eap_aka_3gpp2_functions_t object. + */ +struct private_eap_aka_3gpp2_functions_t { + + /** + * Public eap_aka_3gpp2_functions_t interface. + */ + eap_aka_3gpp2_functions_t public; + + /** + * Used keyed SHA1 function, as PRF + */ + prf_t *prf; +}; + +#define AKA_PAYLOAD_LEN 64 + +#define F1 0x42 +#define F1STAR 0x43 +#define F2 0x44 +#define F3 0x45 +#define F4 0x46 +#define F5 0x47 +#define F5STAR 0x48 + +/** Family key, as proposed in S.S0055 */ +static chunk_t fmk = chunk_from_chars(0x41, 0x48, 0x41, 0x47); + +/** + * Binary represnation of the polynom T^160 + T^5 + T^3 + T^2 + 1 + */ +static u_int8_t g[] = { + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x2d +}; + +/** + * Predefined random bits from the RAND Corporation book + */ +static u_int8_t a[] = { + 0x9d, 0xe9, 0xc9, 0xc8, 0xef, 0xd5, 0x78, 0x11, + 0x48, 0x23, 0x14, 0x01, 0x90, 0x1f, 0x2d, 0x49, + 0x3f, 0x4c, 0x63, 0x65 +}; + +/** + * Predefined random bits from the RAND Corporation book + */ +static u_int8_t b[] = { + 0x75, 0xef, 0xd1, 0x5c, 0x4b, 0x8f, 0x8f, 0x51, + 0x4e, 0xf3, 0xbc, 0xc3, 0x79, 0x4a, 0x76, 0x5e, + 0x7e, 0xec, 0x45, 0xe0 +}; + +/** + * Multiplicate two mpz_t with bits interpreted as polynoms. + */ +static void mpz_mul_poly(mpz_t r, mpz_t a, mpz_t b) +{ + mpz_t bm, rm; + int current = 0, shifted = 0, shift; + + mpz_init_set(bm, b); + mpz_init_set_ui(rm, 0); + /* scan through a, for each found bit: */ + while ((current = mpz_scan1(a, current)) != ULONG_MAX) + { + /* XOR shifted b into r */ + shift = current - shifted; + mpz_mul_2exp(bm, bm, shift); + shifted += shift; + mpz_xor(rm, rm, bm); + current++; + } + + mpz_swap(r, rm); + mpz_clear(rm); + mpz_clear(bm); +} + +/** + * Calculate the sum of a + b interpreted as polynoms. + */ +static void mpz_add_poly(mpz_t res, mpz_t a, mpz_t b) +{ + /* addition of polynominals is just the XOR */ + mpz_xor(res, a, b); +} + +/** + * Calculate the remainder of a/b interpreted as polynoms. + */ +static void mpz_mod_poly(mpz_t r, mpz_t a, mpz_t b) +{ + /* Example: + * a = 10001010 + * b = 00000101 + */ + int a_bit, b_bit, diff; + mpz_t bm, am; + + mpz_init_set(am, a); + mpz_init(bm); + + a_bit = mpz_sizeinbase(a, 2); + b_bit = mpz_sizeinbase(b, 2); + + /* don't do anything if b > a */ + if (a_bit >= b_bit) + { + /* shift b left to align up most signaficant "1" to a: + * a = 10001010 + * b = 10100000 + */ + mpz_mul_2exp(bm, b, a_bit - b_bit); + do + { + /* XOR b into a, this kills the most significant "1": + * a = 00101010 + */ + mpz_xor(am, am, bm); + /* find the next most significant "1" in a, and align up b: + * a = 00101010 + * b = 00101000 + */ + diff = a_bit - mpz_sizeinbase(am, 2); + mpz_div_2exp(bm, bm, diff); + a_bit -= diff; + } + while (b_bit <= mpz_sizeinbase(bm, 2)); + /* While b is not shifted to its original value */ + } + /* after another iteration: + * a = 00000010 + * which is the polynomial modulo + */ + + mpz_swap(r, am); + mpz_clear(am); + mpz_clear(bm); +} + +/** + * Step 3 of the various fx() functions: + * XOR the key into the SHA1 IV + */ +static void step3(prf_t *prf, u_char k[AKA_K_LEN], + u_char payload[AKA_PAYLOAD_LEN], u_int8_t h[HASH_SIZE_SHA1]) +{ + /* use the keyed hasher to build the hash */ + prf->set_key(prf, chunk_create(k, AKA_K_LEN)); + prf->get_bytes(prf, chunk_create(payload, AKA_PAYLOAD_LEN), h); +} + +/** + * Step 4 of the various fx() functions: + * Polynomial whiten calculations + */ +static void step4(u_char x[HASH_SIZE_SHA1]) +{ + mpz_t xm, am, bm, gm; + + mpz_init(xm); + mpz_init(am); + mpz_init(bm); + mpz_init(gm); + + mpz_import(xm, HASH_SIZE_SHA1, 1, 1, 1, 0, x); + mpz_import(am, sizeof(a), 1, 1, 1, 0, a); + mpz_import(bm, sizeof(b), 1, 1, 1, 0, b); + mpz_import(gm, sizeof(g), 1, 1, 1, 0, g); + + mpz_mul_poly(xm, am, xm); + mpz_add_poly(xm, bm, xm); + mpz_mod_poly(xm, xm, gm); + + mpz_export(x, NULL, 1, HASH_SIZE_SHA1, 1, 0, xm); + + mpz_clear(xm); + mpz_clear(am); + mpz_clear(bm); + mpz_clear(gm); +} + +/** + * Calculation function for f2(), f3(), f4() + */ +static void fx(prf_t *prf, u_char f, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char out[AKA_MAC_LEN]) +{ + u_char payload[AKA_PAYLOAD_LEN]; + u_char h[HASH_SIZE_SHA1]; + u_char i; + + for (i = 0; i < 2; i++) + { + memset(payload, 0x5c, AKA_PAYLOAD_LEN); + payload[11] ^= f; + memxor(payload + 12, fmk.ptr, fmk.len); + memxor(payload + 24, rand, AKA_RAND_LEN); + + payload[3] ^= i; + payload[19] ^= i; + payload[35] ^= i; + payload[51] ^= i; + + step3(prf, k, payload, h); + step4(h); + memcpy(out + i * 8, h, 8); + } +} + +/** + * Calculation function of f1() and f1star() + */ +static void f1x(prf_t *prf, u_int8_t f, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char sqn[AKA_SQN_LEN], + u_char amf[AKA_AMF_LEN], u_char mac[AKA_MAC_LEN]) +{ + /* generate MAC = f1(FMK, SQN, RAND, AMF) + * K is loaded into hashers IV; FMK, RAND, SQN, AMF are XORed in a 512-bit + * payload which gets hashed + */ + u_char payload[AKA_PAYLOAD_LEN]; + u_char h[HASH_SIZE_SHA1]; + + memset(payload, 0x5c, AKA_PAYLOAD_LEN); + payload[11] ^= f; + memxor(payload + 12, fmk.ptr, fmk.len); + memxor(payload + 16, rand, AKA_RAND_LEN); + memxor(payload + 34, sqn, AKA_SQN_LEN); + memxor(payload + 42, amf, AKA_AMF_LEN); + + step3(prf, k, payload, h); + step4(h); + memcpy(mac, h, AKA_MAC_LEN); +} + +/** + * Calculation function of f5() and f5star() + */ +static void f5x(prf_t *prf, u_char f, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char ak[AKA_AK_LEN]) +{ + u_char payload[AKA_PAYLOAD_LEN]; + u_char h[HASH_SIZE_SHA1]; + + memset(payload, 0x5c, AKA_PAYLOAD_LEN); + payload[11] ^= f; + memxor(payload + 12, fmk.ptr, fmk.len); + memxor(payload + 16, rand, AKA_RAND_LEN); + + step3(prf, k, payload, h); + step4(h); + memcpy(ak, h, AKA_AK_LEN); +} + +/** + * Calculate MAC from RAND, SQN, AMF using K + */ +static void f1(private_eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char sqn[AKA_SQN_LEN], + u_char amf[AKA_AMF_LEN], u_char mac[AKA_MAC_LEN]) +{ + f1x(this->prf, F1, k, rand, sqn, amf, mac); + DBG3(DBG_IKE, "MAC %b", mac, AKA_MAC_LEN); +} + +/** + * Calculate MACS from RAND, SQN, AMF using K + */ +static void f1star(private_eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char sqn[AKA_SQN_LEN], + u_char amf[AKA_AMF_LEN], u_char macs[AKA_MAC_LEN]) +{ + f1x(this->prf, F1STAR, k, rand, sqn, amf, macs); + DBG3(DBG_IKE, "MACS %b", macs, AKA_MAC_LEN); +} + +/** + * Calculate RES from RAND using K + */ +static void f2(private_eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char res[AKA_RES_MAX]) +{ + fx(this->prf, F2, k, rand, res); + DBG3(DBG_IKE, "RES %b", res, AKA_RES_MAX); +} + +/** + * Calculate CK from RAND using K + */ +static void f3(private_eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char ck[AKA_CK_LEN]) +{ + fx(this->prf, F3, k, rand, ck); + DBG3(DBG_IKE, "CK %b", ck, AKA_CK_LEN); +} + +/** + * Calculate IK from RAND using K + */ +static void f4(private_eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char ik[AKA_IK_LEN]) +{ + fx(this->prf, F4, k, rand, ik); + DBG3(DBG_IKE, "IK %b", ik, AKA_IK_LEN); +} + +/** + * Calculate AK from a RAND using K + */ +static void f5(private_eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char ak[AKA_AK_LEN]) +{ + f5x(this->prf, F5, k, rand, ak); + DBG3(DBG_IKE, "AK %b", ak, AKA_AK_LEN); +} + +/** + * Calculate AKS from a RAND using K + */ +static void f5star(private_eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char aks[AKA_AK_LEN]) +{ + f5x(this->prf, F5STAR, k, rand, aks); + DBG3(DBG_IKE, "AKS %b", aks, AKA_AK_LEN); +} + + +/** + * Implementation of eap_aka_3gpp2_functions_t.destroy. + */ +static void destroy(private_eap_aka_3gpp2_functions_t *this) +{ + this->prf->destroy(this->prf); + free(this); +} + +/** + * See header + */ +eap_aka_3gpp2_functions_t *eap_aka_3gpp2_functions_create() +{ + private_eap_aka_3gpp2_functions_t *this; + + this = malloc_thing(private_eap_aka_3gpp2_functions_t); + + this->public.f1 = (void(*)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], u_char rand[AKA_RAND_LEN], u_char sqn[AKA_SQN_LEN], u_char amf[AKA_AMF_LEN], u_char mac[AKA_MAC_LEN]))f1; + this->public.f1star = (void(*)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], u_char rand[AKA_RAND_LEN], u_char sqn[AKA_SQN_LEN], u_char amf[AKA_AMF_LEN], u_char macs[AKA_MAC_LEN]))f1star; + this->public.f2 = (void(*)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], u_char rand[AKA_RAND_LEN], u_char res[AKA_RES_MAX]))f2; + this->public.f3 = (void(*)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], u_char rand[AKA_RAND_LEN], u_char ck[AKA_CK_LEN]))f3; + this->public.f4 = (void(*)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], u_char rand[AKA_RAND_LEN], u_char ik[AKA_IK_LEN]))f4; + this->public.f5 = (void(*)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], u_char rand[AKA_RAND_LEN], u_char ak[AKA_AK_LEN]))f5; + this->public.f5star = (void(*)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], u_char rand[AKA_RAND_LEN], u_char aks[AKA_AK_LEN]))f5star; + this->public.destroy = (void(*)(eap_aka_3gpp2_functions_t*))destroy; + + this->prf = lib->crypto->create_prf(lib->crypto, PRF_KEYED_SHA1); + if (!this->prf) + { + DBG1(DBG_CFG, "%N not supported, unable to use 3GPP2 algorithm", + pseudo_random_function_names, PRF_KEYED_SHA1); + free(this); + return NULL; + } + return &this->public; +} + diff --git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_functions.h b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_functions.h new file mode 100644 index 000000000..95c6da6a9 --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_functions.h @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2_functions eap_aka_3gpp2_functions + * @{ @ingroup eap_aka_3gpp2 + */ + +#ifndef EAP_AKA_3GPP2_FUNCTIONS_H_ +#define EAP_AKA_3GPP2_FUNCTIONS_H_ + +#include <sa/authenticators/eap/sim_manager.h> + +#define AKA_SQN_LEN 6 +#define AKA_K_LEN 16 +#define AKA_MAC_LEN 8 +#define AKA_AK_LEN 6 +#define AKA_AMF_LEN 2 +#define AKA_FMK_LEN 4 + +typedef struct eap_aka_3gpp2_functions_t eap_aka_3gpp2_functions_t; + +/** + * f1-f5(), f1*() and f5*() functions from the 3GPP2 (S.S0055) standard. + */ +struct eap_aka_3gpp2_functions_t { + + /** + * Calculate MAC from RAND, SQN, AMF using K. + * + * @param k secret key K + * @param rand random value rand + * @param sqn sequence number + * @param amf authentication management field + * @param mac buffer receiving mac MAC + */ + void (*f1)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char sqn[AKA_SQN_LEN], + u_char amf[AKA_AMF_LEN], u_char mac[AKA_MAC_LEN]); + + /** + * Calculate MACS from RAND, SQN, AMF using K + * + * @param k secret key K + * @param rand random value RAND + * @param sqn sequence number + * @param amf authentication management field + * @param macs buffer receiving resynchronization mac MACS + */ + void (*f1star)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char sqn[AKA_SQN_LEN], + u_char amf[AKA_AMF_LEN], u_char macs[AKA_MAC_LEN]); + + /** + * Calculate RES from RAND using K + * + * @param k secret key K + * @param rand random value RAND + * @param res buffer receiving result RES, uses full 128 bit + */ + void (*f2)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char res[AKA_RES_MAX]); + /** + * Calculate CK from RAND using K + * + * @param k secret key K + * @param rand random value RAND + * @param macs buffer receiving encryption key CK + */ + void (*f3)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char ck[AKA_CK_LEN]); + /** + * Calculate IK from RAND using K + * + * @param k secret key K + * @param rand random value RAND + * @param macs buffer receiving integrity key IK + */ + void (*f4)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char ik[AKA_IK_LEN]); + /** + * Calculate AK from a RAND using K + * + * @param k secret key K + * @param rand random value RAND + * @param macs buffer receiving anonymity key AK + */ + void (*f5)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char ak[AKA_AK_LEN]); + /** + * Calculate AKS from a RAND using K + * + * @param k secret key K + * @param rand random value RAND + * @param macs buffer receiving resynchronization anonymity key AKS + */ + void (*f5star)(eap_aka_3gpp2_functions_t *this, u_char k[AKA_K_LEN], + u_char rand[AKA_RAND_LEN], u_char aks[AKA_AK_LEN]); + + /** + * Destroy a eap_aka_3gpp2_functions_t. + */ + void (*destroy)(eap_aka_3gpp2_functions_t *this); +}; + +/** + * Create a eap_aka_3gpp2_functions instance. + * + * @return function set, NULL on error + */ +eap_aka_3gpp2_functions_t *eap_aka_3gpp2_functions_create(); + +#endif /** EAP_AKA_3GPP2_FUNCTIONS_H_ @}*/ diff --git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_plugin.c b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_plugin.c new file mode 100644 index 000000000..626e83311 --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_plugin.c @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2_plugin.h" +#include "eap_aka_3gpp2_card.h" +#include "eap_aka_3gpp2_provider.h" +#include "eap_aka_3gpp2_functions.h" + +#include <daemon.h> + +typedef struct private_eap_aka_3gpp2_t private_eap_aka_3gpp2_t; + +/** + * Private data of an eap_aka_3gpp2_t object. + */ +struct private_eap_aka_3gpp2_t { + + /** + * Public eap_aka_3gpp2_plugin_t interface. + */ + eap_aka_3gpp2_plugin_t public; + + /** + * SIM card + */ + eap_aka_3gpp2_card_t *card; + + /** + * SIM provider + */ + eap_aka_3gpp2_provider_t *provider; + + /** + * AKA functions + */ + eap_aka_3gpp2_functions_t *functions; +}; + +/** + * Implementation of eap_aka_3gpp2_t.destroy. + */ +static void destroy(private_eap_aka_3gpp2_t *this) +{ + charon->sim->remove_card(charon->sim, &this->card->card); + charon->sim->remove_provider(charon->sim, &this->provider->provider); + this->card->destroy(this->card); + this->provider->destroy(this->provider); + this->functions->destroy(this->functions); + free(this); +} + +/** + * See header + */ +plugin_t *eap_aka_3gpp2_plugin_create() +{ + private_eap_aka_3gpp2_t *this = malloc_thing(private_eap_aka_3gpp2_t); + + this->public.plugin.destroy = (void(*)(plugin_t*))destroy; + + this->functions = eap_aka_3gpp2_functions_create(); + if (!this->functions) + { + free(this); + return NULL; + } + this->card = eap_aka_3gpp2_card_create(this->functions); + this->provider = eap_aka_3gpp2_provider_create(this->functions); + + charon->sim->add_card(charon->sim, &this->card->card); + charon->sim->add_provider(charon->sim, &this->provider->provider); + + return &this->public.plugin; +} + diff --git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_plugin.h b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_plugin.h new file mode 100644 index 000000000..2ac450a7d --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_plugin.h @@ -0,0 +1,57 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2 eap_aka_3gpp2 + * @ingroup cplugins + * + * @defgroup eap_aka_3gpp2_plugin eap_aka_3gpp2_plugin + * @{ @ingroup eap_aka_3gpp2 + */ + +#ifndef EAP_AKA_3GPP2_PLUGIN_H_ +#define EAP_AKA_3GPP2_PLUGIN_H_ + +#include <plugins/plugin.h> + +typedef struct eap_aka_3gpp2_plugin_t eap_aka_3gpp2_plugin_t; + +/** + * Plugin to provide a SIM card/provider using the 3GPP2 (S.S0055) standard. + * + * This plugin implements the standard of the 3GPP2 (S.S0055) and not the one + * of 3GGP, completely in software using the libgmp library.. + * The shared key used for authentication is from ipsec.secrets. The + * peers ID is used to query it. + * The AKA mechanism uses sequence numbers to detect replay attacks. The + * peer stores the sequence number normally in a USIM and accepts + * incremental sequence numbers (incremental for lifetime of the USIM). To + * prevent a complex sequence number management, this implementation uses + * a sequence number derived from time. It is initialized to the startup + * time of the daemon. + * To enable time based SEQs, define SEQ_CHECK as 1. Default is to accept + * any SEQ numbers. This allows an attacker to do replay attacks. But since + * the server has proven his identity via IKE, such an attack is only + * possible between server and AAA (if any). + */ +struct eap_aka_3gpp2_plugin_t { + + /** + * implements plugin interface + */ + plugin_t plugin; +}; + +#endif /** EAP_AKA_3GPP2_PLUGIN_H_ @}*/ diff --git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_provider.c b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_provider.c new file mode 100644 index 000000000..9817fff8f --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_provider.c @@ -0,0 +1,204 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2_provider.h" + +#include <daemon.h> +#include <credentials/keys/shared_key.h> + +typedef struct private_eap_aka_3gpp2_provider_t private_eap_aka_3gpp2_provider_t; + +/** + * Private data of an eap_aka_3gpp2_provider_t object. + */ +struct private_eap_aka_3gpp2_provider_t { + + /** + * Public eap_aka_3gpp2_provider_t interface. + */ + eap_aka_3gpp2_provider_t public; + + /** + * AKA functions + */ + eap_aka_3gpp2_functions_t *f; + + /** + * time based SQN, we use the same for all peers + */ + char sqn[AKA_SQN_LEN]; +}; + +/** Authentication management field */ +static char amf[AKA_AMF_LEN] = {0x00, 0x01}; + +/** + * Get a shared key K from the credential database + */ +bool eap_aka_3gpp2_get_k(identification_t *id, char k[AKA_K_LEN]) +{ + shared_key_t *shared; + chunk_t key; + + shared = charon->credentials->get_shared(charon->credentials, + SHARED_EAP, id, NULL); + if (shared == NULL) + { + return FALSE; + } + key = shared->get_key(shared); + memset(k, '\0', AKA_K_LEN); + memcpy(k, key.ptr, min(key.len, AKA_K_LEN)); + shared->destroy(shared); + return TRUE; +} + +/** + * get SQN using current time + */ +void eap_aka_3gpp2_get_sqn(char sqn[AKA_SQN_LEN], int offset) +{ + timeval_t time; + + gettimeofday(&time, NULL); + /* set sqn to an integer containing 4 bytes seconds + 2 bytes usecs */ + time.tv_sec = htonl(time.tv_sec + offset); + /* usec's are never larger than 0x000f423f, so we shift the 12 first bits */ + time.tv_usec = htonl(time.tv_usec << 12); + memcpy(sqn, (char*)&time.tv_sec + sizeof(time_t) - 4, 4); + memcpy(sqn + 4, &time.tv_usec, 2); +} + +/** + * Implementation of usim_provider_t.get_quintuplet + */ +static bool get_quintuplet(private_eap_aka_3gpp2_provider_t *this, + identification_t *id, char rand[AKA_RAND_LEN], + char xres[AKA_RES_MAX], int *xres_len, + char ck[AKA_CK_LEN], char ik[AKA_IK_LEN], + char autn[AKA_AUTN_LEN]) +{ + rng_t *rng; + char mac[AKA_MAC_LEN], ak[AKA_AK_LEN], k[AKA_K_LEN]; + + /* generate RAND: we use a registered RNG, not f0() proposed in S.S0055 */ + rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK); + if (!rng) + { + DBG1(DBG_IKE, "generating RAND for AKA failed"); + return FALSE; + } + rng->get_bytes(rng, AKA_RAND_LEN, rand); + rng->destroy(rng); + + if (!eap_aka_3gpp2_get_k(id, k)) + { + DBG1(DBG_IKE, "no EAP key found for %Y to authenticate with AKA", id); + return FALSE; + } + + DBG3(DBG_IKE, "generated rand %b", rand, AKA_RAND_LEN); + DBG3(DBG_IKE, "using K %b", k, AKA_K_LEN); + + /* MAC */ + this->f->f1(this->f, k, rand, this->sqn, amf, mac); + /* AK */ + this->f->f5(this->f, k, rand, ak); + /* XRES as expected from client */ + this->f->f2(this->f, k, rand, xres); + *xres_len = AKA_RES_MAX; + /* AUTN = (SQN xor AK) || AMF || MAC */ + memcpy(autn, this->sqn, AKA_SQN_LEN); + memxor(autn, ak, AKA_AK_LEN); + memcpy(autn + AKA_SQN_LEN, amf, AKA_AMF_LEN); + memcpy(autn + AKA_SQN_LEN + AKA_AMF_LEN, mac, AKA_MAC_LEN); + DBG3(DBG_IKE, "AUTN %b", autn, AKA_AUTN_LEN); + /* CK/IK */ + this->f->f3(this->f, k, rand, ck); + this->f->f4(this->f, k, rand, ik); + + return TRUE; +} + +/** + * Implementation of usim_provider_t.resync + */ +static bool resync(private_eap_aka_3gpp2_provider_t *this, + identification_t *id, char rand[AKA_RAND_LEN], + char auts[AKA_AUTS_LEN]) +{ + char *sqn, *macs; + char aks[AKA_AK_LEN], k[AKA_K_LEN], amf[AKA_AMF_LEN], xmacs[AKA_MAC_LEN]; + + if (!eap_aka_3gpp2_get_k(id, k)) + { + DBG1(DBG_IKE, "no EAP key found for %Y to authenticate with AKA", id); + return FALSE; + } + + /* AUTHS = (AK xor SQN) | MAC */ + sqn = auts; + macs = auts + AKA_SQN_LEN; + this->f->f5star(this->f, k, rand, aks); + memxor(sqn, aks, AKA_AK_LEN); + + /* verify XMACS, AMF of zero is used in resynchronization */ + memset(amf, 0, AKA_AMF_LEN); + this->f->f1star(this->f, k, rand, sqn, amf, xmacs); + if (!memeq(macs, xmacs, AKA_MAC_LEN)) + { + DBG1(DBG_IKE, "received MACS does not match XMACS"); + DBG3(DBG_IKE, "MACS %b XMACS %b", + macs, AKA_MAC_LEN, xmacs, AKA_MAC_LEN); + return FALSE; + } + /* update stored SQN to received SQN + 1 */ + memcpy(this->sqn, sqn, AKA_SQN_LEN); + chunk_increment(chunk_create(this->sqn, AKA_SQN_LEN)); + return TRUE; +} + +/** + * Implementation of eap_aka_3gpp2_provider_t.destroy. + */ +static void destroy(private_eap_aka_3gpp2_provider_t *this) +{ + free(this); +} + +/** + * See header + */ +eap_aka_3gpp2_provider_t *eap_aka_3gpp2_provider_create( + eap_aka_3gpp2_functions_t *f) +{ + private_eap_aka_3gpp2_provider_t *this = malloc_thing(private_eap_aka_3gpp2_provider_t); + + this->public.provider.get_triplet = (bool(*)(sim_provider_t*, identification_t *id, char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN], char kc[SIM_KC_LEN]))return_false; + this->public.provider.get_quintuplet = (bool(*)(sim_provider_t*, identification_t *id, char rand[AKA_RAND_LEN], char xres[AKA_RES_MAX], int *xres_len, char ck[AKA_CK_LEN], char ik[AKA_IK_LEN], char autn[AKA_AUTN_LEN]))get_quintuplet; + this->public.provider.resync = (bool(*)(sim_provider_t*, identification_t *id, char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]))resync; + this->public.provider.is_pseudonym = (identification_t*(*)(sim_provider_t*, identification_t *id))return_null; + this->public.provider.gen_pseudonym = (identification_t*(*)(sim_provider_t*, identification_t *id))return_null; + this->public.provider.is_reauth = (identification_t*(*)(sim_provider_t*, identification_t *id, char [HASH_SIZE_SHA1], u_int16_t *counter))return_null; + this->public.provider.gen_reauth = (identification_t*(*)(sim_provider_t*, identification_t *id, char mk[HASH_SIZE_SHA1]))return_null; + this->public.destroy = (void(*)(eap_aka_3gpp2_provider_t*))destroy; + + this->f = f; + /* use an offset to accept clock skew between client/server without resync */ + eap_aka_3gpp2_get_sqn(this->sqn, 180); + + return &this->public; +} + diff --git a/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_provider.h b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_provider.h new file mode 100644 index 000000000..22ac0a96e --- /dev/null +++ b/src/libcharon/plugins/eap_aka_3gpp2/eap_aka_3gpp2_provider.h @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2008-2009 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_aka_3gpp2_provider eap_aka_3gpp2_provider + * @{ @ingroup eap_aka_3gpp2 + */ + +#ifndef EAP_AKA_3GPP2_PROVIDER_H_ +#define EAP_AKA_3GPP2_PROVIDER_H_ + +#include "eap_aka_3gpp2_functions.h" + +#include <sa/authenticators/eap/sim_manager.h> + +typedef struct eap_aka_3gpp2_provider_t eap_aka_3gpp2_provider_t; + +/** + * SIM provider implementation using a set of AKA functions. + */ +struct eap_aka_3gpp2_provider_t { + + /** + * Implements sim_provider_t interface. + */ + sim_provider_t provider; + + /** + * Destroy a eap_aka_3gpp2_provider_t. + */ + void (*destroy)(eap_aka_3gpp2_provider_t *this); +}; + +/** + * Create a eap_aka_3gpp2_provider instance. + */ +eap_aka_3gpp2_provider_t *eap_aka_3gpp2_provider_create( + eap_aka_3gpp2_functions_t *f); + +#endif /** EAP_AKA_3GPP2_PROVIDER_H_ @}*/ |