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historical archive of an early approach towards a stand-alone AUthentication Center. Use osmo-hlr instead.
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osmo-auc/src/auc_core.c

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/* (C) 2012 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 Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <errno.h>
#include <string.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/crypt/auth.h>
#include "auc.h"
static struct llist_head *auc_buckets;
static unsigned int g_nbuckets;
int auc_core_init(void *ctx, unsigned int nbuckets)
{
int i;
auc_buckets = talloc_array(ctx, struct llist_head, nbuckets);
if (!auc_buckets)
return -ENOMEM;
g_nbuckets = nbuckets;
for (i = 0; i < nbuckets; i++)
INIT_LLIST_HEAD(&auc_buckets[i]);
return 0;
}
static unsigned int osmo_auc_hashfn(const char *imsi)
{
int len = strlen(imsi);
unsigned int res;
res = atoi(imsi + len - 6);
return res % g_nbuckets;
}
int auc_add_rec(struct auc_rec *rec)
{
struct auc_rec *exist;
unsigned int hash = osmo_auc_hashfn(rec->imsi);
struct llist_head *list = &auc_buckets[hash];
/* make sure we don't get duplicates */
llist_for_each_entry(exist, list, hash_list) {
if (!strcmp(exist->imsi, rec->imsi))
return -EEXIST;
}
llist_add(&rec->hash_list, list);
return 0;
}
struct auc_rec *auc_lookup(const char *imsi)
{
struct auc_rec *exist;
unsigned int hash = osmo_auc_hashfn(imsi);
struct llist_head *list = &auc_buckets[hash];
/* make sure we don't get duplicates */
llist_for_each_entry(exist, list, hash_list) {
if (!strcmp(exist->imsi, imsi))
return exist;
}
return NULL;
}
int auc_gen_vecs(struct osmo_auth_vector *vec,
const char *imsi, int n_vecs)
{
struct auc_rec *rec;
int i;
rec = auc_lookup(imsi);
if (!rec)
return -ENOENT;
for (i = 0; i < n_vecs; i++) {
uint8_t rand[16];
int rc;
rc = auc_get_rand(rand, sizeof(rand));
if (rc < 0)
return rc;
rc = osmo_auth_gen_vec(&vec[i], &rec->auth, rand);
if (rc < 0)
return rc;
}
return 0;
}
int auc_gen_vec_auts(struct osmo_auth_vector *vec,
const char *imsi, const uint8_t *rand_auts,
const uint8_t *auts)
{
struct auc_rec *rec;
uint8_t rand[16];
int rc;
rec = auc_lookup(imsi);
if (!rec)
return -ENOENT;
rc = auc_get_rand(rand, sizeof(rand));
if (rc < 0)
return rc;
return osmo_auth_gen_vec_auts(vec, &rec->auth, rand_auts, auts, rand);
}