mirror of https://gerrit.osmocom.org/libosmocore
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
/* GSM/GPRS/3G authentication core infrastructure */
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/* (C) 2010-2011 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 <errno.h>
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#include <stdint.h>
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#include <string.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/plugin.h>
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#include <osmocom/crypt/auth.h>
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static LLIST_HEAD(osmo_auths);
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static struct osmo_auth_impl *selected_auths[_OSMO_AUTH_ALG_NUM];
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/* register a cipher with the core */
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int osmo_auth_register(struct osmo_auth_impl *impl)
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{
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if (impl->algo >= ARRAY_SIZE(selected_auths))
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return -ERANGE;
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llist_add_tail(&impl->list, &osmo_auths);
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/* check if we want to select this implementation over others */
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if (!selected_auths[impl->algo] ||
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(selected_auths[impl->algo]->priority > impl->priority))
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selected_auths[impl->algo] = impl;
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return 0;
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}
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/* load all available GPRS cipher plugins */
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int osmo_auth_load(const char *path)
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{
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/* load all plugins available from path */
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return osmo_plugin_load_all(path);
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}
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int osmo_auth_supported(enum osmo_auth_algo algo)
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{
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if (algo >= ARRAY_SIZE(selected_auths))
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return -ERANGE;
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if (selected_auths[algo])
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return 1;
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return 0;
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}
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int osmo_auth_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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struct osmo_auth_impl *impl = selected_auths[aud->algo];
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int rc;
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if (!impl)
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return -ENOENT;
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rc = impl->gen_vec(vec, aud, _rand);
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if (rc < 0)
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return rc;
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memcpy(vec->rand, _rand, sizeof(vec->rand));
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return 0;
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}
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int osmo_auth_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 *rand_auts, const uint8_t *auts,
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const uint8_t *_rand)
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{
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struct osmo_auth_impl *impl = selected_auths[aud->algo];
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if (!impl || !impl->gen_vec_auts)
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return -ENOENT;
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return impl->gen_vec_auts(vec, aud, rand_auts, auts, _rand);
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}
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static const struct value_string auth_alg_vals[] = {
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{ OSMO_AUTH_ALG_NONE, "None" },
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{ OSMO_AUTH_ALG_COMP128v1, "COMP128v1" },
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{ OSMO_AUTH_ALG_COMP128v2, "COMP128v2" },
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{ OSMO_AUTH_ALG_COMP128v3, "COMP128v3" },
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{ OSMO_AUTH_ALG_XOR, "XOR" },
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{ OSMO_AUTH_ALG_MILENAGE, "MILENAGE" },
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{ 0, NULL }
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};
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const char *osmo_auth_alg_name(enum osmo_auth_algo alg)
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{
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return get_value_string(auth_alg_vals, alg);
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}
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enum osmo_auth_algo osmo_auth_alg_parse(const char *name)
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{
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return get_string_value(auth_alg_vals, name);
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}
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