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/* 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/gsm_subscriber.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 }
};
const struct value_string *sgsn_auth_state_names = auth_state_names;
void sgsn_auth_init(void)
{
INIT_LLIST_HEAD(&sgsn->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)
{
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;
case SGSN_AUTH_POLICY_REMOTE:
if (!mmctx->subscr)
return mmctx->auth_state;
if (mmctx->subscr->flags & GPRS_SUBSCRIBER_UPDATE_PENDING)
return mmctx->auth_state;
if (mmctx->subscr->authorized)
return SGSN_AUTH_ACCEPTED;
return SGSN_AUTH_REJECTED;
}
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)
{
LOGMMCTXP(LOGL_DEBUG, mmctx, "Requesting authorization\n");
if (sgsn->cfg.auth_policy == SGSN_AUTH_POLICY_REMOTE && !mmctx->subscr) {
if (gprs_subscr_request_update(mmctx) >= 0) {
LOGMMCTXP(LOGL_INFO, mmctx,
"Missing information, requesting subscriber data\n");
return 0;
}
}
sgsn_auth_update(mmctx);
return 0;
}
void sgsn_auth_update(struct sgsn_mm_ctx *mmctx)
{
enum sgsn_auth_state auth_state;
struct gsm_subscriber *subscr = mmctx->subscr;
LOGMMCTXP(LOGL_DEBUG, mmctx, "Updating authorization\n");
auth_state = sgsn_auth_state(mmctx);
if (auth_state == SGSN_AUTH_UNKNOWN && subscr &&
!(subscr->flags & GPRS_SUBSCRIBER_UPDATE_PENDING)) {
/* Reject requests if gprs_subscr_request_update fails */
LOGMMCTXP(LOGL_ERROR, mmctx,
"Missing information, authorization not possible\n");
auth_state = SGSN_AUTH_REJECTED;
}
if (mmctx->auth_state == auth_state)
return;
LOGMMCTXP(LOGL_INFO, mmctx, "Got authorization update: state %s -> %s\n",
get_value_string(sgsn_auth_state_names, mmctx->auth_state),
get_value_string(sgsn_auth_state_names, auth_state));
mmctx->auth_state = auth_state;
switch (auth_state) {
case SGSN_AUTH_ACCEPTED:
gsm0408_gprs_access_granted(mmctx);
break;
case SGSN_AUTH_REJECTED:
if (subscr && (subscr->flags & GPRS_SUBSCRIBER_CANCELLED) != 0)
gsm0408_gprs_access_cancelled(mmctx);
else
gsm0408_gprs_access_denied(mmctx);
break;
default:
break;
}
}
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