161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
/* MS authorization and subscriber data handling */
|
|
|
|
/* (C) 2009-2010 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 <openbsc/sgsn.h>
|
|
#include <openbsc/gprs_sgsn.h>
|
|
#include <openbsc/gprs_gmm.h>
|
|
|
|
#include <openbsc/debug.h>
|
|
|
|
const struct value_string auth_state_names[] = {
|
|
{ SGSN_AUTH_ACCEPTED, "accepted"},
|
|
{ SGSN_AUTH_REJECTED, "rejected"},
|
|
{ SGSN_AUTH_UNKNOWN, "unknown"},
|
|
{ 0, NULL }
|
|
};
|
|
|
|
void sgsn_auth_init(struct sgsn_instance *sgi)
|
|
{
|
|
INIT_LLIST_HEAD(&sgi->cfg.imsi_acl);
|
|
}
|
|
|
|
/* temporary IMSI ACL hack */
|
|
struct imsi_acl_entry *sgsn_acl_lookup(const char *imsi, struct sgsn_config *cfg)
|
|
{
|
|
struct imsi_acl_entry *acl;
|
|
llist_for_each_entry(acl, &cfg->imsi_acl, list) {
|
|
if (!strcmp(imsi, acl->imsi))
|
|
return acl;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int sgsn_acl_add(const char *imsi, struct sgsn_config *cfg)
|
|
{
|
|
struct imsi_acl_entry *acl;
|
|
|
|
if (sgsn_acl_lookup(imsi, cfg))
|
|
return -EEXIST;
|
|
|
|
acl = talloc_zero(NULL, struct imsi_acl_entry);
|
|
if (!acl)
|
|
return -ENOMEM;
|
|
strncpy(acl->imsi, imsi, sizeof(acl->imsi));
|
|
|
|
llist_add(&acl->list, &cfg->imsi_acl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sgsn_acl_del(const char *imsi, struct sgsn_config *cfg)
|
|
{
|
|
struct imsi_acl_entry *acl;
|
|
|
|
acl = sgsn_acl_lookup(imsi, cfg);
|
|
if (!acl)
|
|
return -ENODEV;
|
|
|
|
llist_del(&acl->list);
|
|
talloc_free(acl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mmctx,
|
|
struct sgsn_config *cfg)
|
|
{
|
|
char mccmnc[16];
|
|
int check_net = 0;
|
|
int check_acl = 0;
|
|
|
|
OSMO_ASSERT(mmctx);
|
|
|
|
switch (sgsn->cfg.auth_policy) {
|
|
case SGSN_AUTH_POLICY_OPEN:
|
|
return SGSN_AUTH_ACCEPTED;
|
|
|
|
case SGSN_AUTH_POLICY_CLOSED:
|
|
check_net = 1;
|
|
check_acl = 1;
|
|
break;
|
|
|
|
case SGSN_AUTH_POLICY_ACL_ONLY:
|
|
check_acl = 1;
|
|
break;
|
|
}
|
|
|
|
if (!strlen(mmctx->imsi)) {
|
|
LOGMMCTXP(LOGL_NOTICE, mmctx,
|
|
"Missing IMSI, authorization state not known\n");
|
|
return SGSN_AUTH_UNKNOWN;
|
|
}
|
|
|
|
if (check_net) {
|
|
/* We simply assume that the IMSI exists, as long as it is part
|
|
* of 'our' network */
|
|
snprintf(mccmnc, sizeof(mccmnc), "%03d%02d",
|
|
mmctx->ra.mcc, mmctx->ra.mnc);
|
|
if (strncmp(mccmnc, mmctx->imsi, 5) == 0)
|
|
return SGSN_AUTH_ACCEPTED;
|
|
}
|
|
|
|
if (check_acl && sgsn_acl_lookup(mmctx->imsi, &sgsn->cfg))
|
|
return SGSN_AUTH_ACCEPTED;
|
|
|
|
return SGSN_AUTH_REJECTED;
|
|
}
|
|
|
|
int sgsn_auth_request(struct sgsn_mm_ctx *mmctx, struct sgsn_config *cfg)
|
|
{
|
|
struct sgsn_subscriber_data sd = {0};
|
|
|
|
sd.auth_state = sgsn_auth_state(mmctx, cfg);
|
|
|
|
if (sd.auth_state == SGSN_AUTH_UNKNOWN) {
|
|
LOGMMCTXP(LOGL_ERROR, mmctx,
|
|
"Missing information, authorization not possible\n");
|
|
sd.auth_state = SGSN_AUTH_REJECTED;
|
|
}
|
|
|
|
/* This will call sgsn_auth_update if auth_state has changed */
|
|
sgsn_update_subscriber_data(mmctx, &sd);
|
|
return 0;
|
|
}
|
|
|
|
void sgsn_auth_update(struct sgsn_mm_ctx *mmctx, struct sgsn_subscriber_data *sd)
|
|
{
|
|
LOGMMCTXP(LOGL_INFO, mmctx, "Got authorization update: state %s\n",
|
|
get_value_string(auth_state_names, sd->auth_state));
|
|
|
|
mmctx->auth_state = sd->auth_state;
|
|
|
|
switch (sd->auth_state) {
|
|
case SGSN_AUTH_ACCEPTED:
|
|
gsm0408_gprs_access_granted(mmctx);
|
|
break;
|
|
case SGSN_AUTH_REJECTED:
|
|
gsm0408_gprs_access_denied(mmctx);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|