mirror of https://gerrit.osmocom.org/libosmocore
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* GSM/GPRS/3G authentication core infrastructure */
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/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <osmocom/crypt/auth.h>
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#include "milenage/common.h"
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#include "milenage/milenage.h"
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static void sqn_u64_to_48bit(uint8_t *sqn, const uint64_t sqn64)
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{
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sqn[5] = (sqn64 >> 0) & 0xff;
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sqn[4] = (sqn64 >> 8) & 0xff;
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sqn[3] = (sqn64 >> 16) & 0xff;
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sqn[2] = (sqn64 >> 24) & 0xff;
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sqn[1] = (sqn64 >> 32) & 0xff;
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sqn[0] = (sqn64 >> 40) & 0xff;
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}
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static uint64_t sqn_48bit_to_u64(const uint8_t *sqn)
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{
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uint64_t sqn64;
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sqn64 = sqn[0];
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sqn64 <<= 8;
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sqn64 |= sqn[1];
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sqn64 <<= 8;
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sqn64 |= sqn[2];
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sqn64 <<= 8;
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sqn64 |= sqn[3];
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sqn64 <<= 8;
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sqn64 |= sqn[4];
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sqn64 <<= 8;
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sqn64 |= sqn[5];
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return sqn64;
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}
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static int milenage_gen_vec(struct osmo_auth_vector *vec,
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struct osmo_sub_auth_data *aud,
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const uint8_t *_rand)
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{
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size_t res_len = sizeof(vec->res);
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uint8_t sqn[6];
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int rc;
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sqn_u64_to_48bit(sqn, aud->u.umts.sqn);
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milenage_generate(aud->u.umts.opc, aud->u.umts.amf, aud->u.umts.k,
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sqn, _rand,
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vec->autn, vec->ik, vec->ck, vec->res, &res_len);
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vec->res_len = res_len;
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rc = gsm_milenage(aud->u.umts.opc, aud->u.umts.k, _rand, vec->sres, vec->kc);
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if (rc < 0)
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return rc;
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vec->auth_types = OSMO_AUTH_TYPE_UMTS | OSMO_AUTH_TYPE_GSM;
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aud->u.umts.sqn++;
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return 0;
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}
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static int milenage_gen_vec_auts(struct osmo_auth_vector *vec,
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struct osmo_sub_auth_data *aud,
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const uint8_t *auts, const uint8_t *rand_auts,
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const uint8_t *_rand)
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{
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uint8_t sqn_out[6];
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uint8_t gen_opc[16];
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uint8_t *opc;
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int rc;
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/* Check if we only know OP and compute OPC if required */
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if (aud->type == OSMO_AUTH_TYPE_UMTS && aud->u.umts.opc_is_op) {
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rc = milenage_opc_gen(gen_opc, aud->u.umts.k,
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aud->u.umts.opc);
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if (rc < 0)
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return rc;
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opc = gen_opc;
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} else
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opc = aud->u.umts.opc;
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rc = milenage_auts(opc, aud->u.umts.k, rand_auts, auts, sqn_out);
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if (rc < 0)
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return rc;
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aud->u.umts.sqn = sqn_48bit_to_u64(sqn_out) + 1;
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return milenage_gen_vec(vec, aud, _rand);
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}
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static struct osmo_auth_impl milenage_alg = {
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.algo = OSMO_AUTH_ALG_MILENAGE,
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.name = "MILENAGE (libosmogsm built-in)",
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.priority = 1000,
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.gen_vec = &milenage_gen_vec,
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.gen_vec_auts = &milenage_gen_vec_auts,
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};
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static __attribute__((constructor)) void on_dso_load_milenage(void)
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{
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osmo_auth_register(&milenage_alg);
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}
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