| /* GSM/GPRS/3G authentication core infrastructure */ |
| |
| /* (C) 2010-2011 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * 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. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <errno.h> |
| #include <stdint.h> |
| #include <string.h> |
| |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/linuxlist.h> |
| #include <osmocom/core/plugin.h> |
| |
| #include <osmocom/crypt/auth.h> |
| |
| static LLIST_HEAD(osmo_auths); |
| |
| static struct osmo_auth_impl *selected_auths[_OSMO_AUTH_ALG_NUM]; |
| |
| /* register a cipher with the core */ |
| int osmo_auth_register(struct osmo_auth_impl *impl) |
| { |
| if (impl->algo >= ARRAY_SIZE(selected_auths)) |
| return -ERANGE; |
| |
| llist_add_tail(&impl->list, &osmo_auths); |
| |
| /* check if we want to select this implementation over others */ |
| if (!selected_auths[impl->algo] || |
| (selected_auths[impl->algo]->priority > impl->priority)) |
| selected_auths[impl->algo] = impl; |
| |
| return 0; |
| } |
| |
| /* load all available GPRS cipher plugins */ |
| int osmo_auth_load(const char *path) |
| { |
| /* load all plugins available from path */ |
| return osmo_plugin_load_all(path); |
| } |
| |
| int osmo_auth_supported(enum osmo_auth_algo algo) |
| { |
| if (algo >= ARRAY_SIZE(selected_auths)) |
| return -ERANGE; |
| |
| if (selected_auths[algo]) |
| return 1; |
| |
| return 0; |
| } |
| |
| int osmo_auth_gen_vec(struct osmo_auth_vector *vec, |
| struct osmo_sub_auth_data *aud, |
| const uint8_t *_rand) |
| { |
| struct osmo_auth_impl *impl = selected_auths[aud->algo]; |
| int rc; |
| |
| if (!impl) |
| return -ENOENT; |
| |
| rc = impl->gen_vec(vec, aud, _rand); |
| if (rc < 0) |
| return rc; |
| |
| memcpy(vec->rand, _rand, sizeof(vec->rand)); |
| |
| return 0; |
| } |
| |
| int osmo_auth_gen_vec_auts(struct osmo_auth_vector *vec, |
| struct osmo_sub_auth_data *aud, |
| const uint8_t *rand_auts, const uint8_t *auts, |
| const uint8_t *_rand) |
| { |
| struct osmo_auth_impl *impl = selected_auths[aud->algo]; |
| |
| if (!impl || !impl->gen_vec_auts) |
| return -ENOENT; |
| |
| return impl->gen_vec_auts(vec, aud, rand_auts, auts, _rand); |
| } |
| |
| static const struct value_string auth_alg_vals[] = { |
| { OSMO_AUTH_ALG_NONE, "None" }, |
| { OSMO_AUTH_ALG_COMP128v1, "COMP128v1" }, |
| { OSMO_AUTH_ALG_COMP128v2, "COMP128v2" }, |
| { OSMO_AUTH_ALG_COMP128v3, "COMP128v3" }, |
| { OSMO_AUTH_ALG_XOR, "XOR" }, |
| { OSMO_AUTH_ALG_MILENAGE, "MILENAGE" }, |
| { 0, NULL } |
| }; |
| |
| const char *osmo_auth_alg_name(enum osmo_auth_algo alg) |
| { |
| return get_value_string(auth_alg_vals, alg); |
| } |
| |
| enum osmo_auth_algo osmo_auth_alg_parse(const char *name) |
| { |
| return get_string_value(auth_alg_vals, name); |
| } |