initial import of a minimalistic AUC (authentication center) core

1 files changed, 125 insertions, 0 deletions

diff --git a/src/auc_core.c b/src/auc_core.c
new file mode 100644
index 0000000..0fd09f8
--- /dev/null
+++ b/src/auc_core.c
@@ -0,0 +1,125 @@
+/* (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/crypt/auth.h>
+
+#include "auc.h"
+
+#define NBUCKETS 1024
+static struct llist_head auc_buckets[NBUCKETS];
+
+int auc_core_init(void *ctx)
+{
+	int i;
+
+	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 % 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);
+}