sgsn: Integrate subscriber handling into the SGSN
This commit adds a new authorization policy 'remote' and uses
the subscriber cache for authorization when this policy is being used.
Note that there is no remote backend implemented yet. After the
IMSI/IMEI have been acquired, a request would be sent to the remote
peer. The attach/auth-ciph procedure continues when authorization
info has been received from the peer. This means, that
gprs_subscr_update() must be called then to tell the GMM layer
that it can proceed. A later commit will add VTY commands to do this
manually.
Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/gprs/sgsn_auth.c b/openbsc/src/gprs/sgsn_auth.c
index eb85d45..071bdab 100644
--- a/openbsc/src/gprs/sgsn_auth.c
+++ b/openbsc/src/gprs/sgsn_auth.c
@@ -22,6 +22,7 @@
#include <openbsc/sgsn.h>
#include <openbsc/gprs_sgsn.h>
#include <openbsc/gprs_gmm.h>
+#include <openbsc/gsm_subscriber.h>
#include <openbsc/debug.h>
@@ -101,6 +102,18 @@
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)) {
@@ -126,7 +139,15 @@
int sgsn_auth_request(struct sgsn_mm_ctx *mmctx)
{
- /* TODO: Add remote subscriber update requests here */
+ 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);
@@ -136,12 +157,14 @@
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) {
- /* Reject requests since remote updates are NYI */
+ 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;