Add regexp authorization policy for IMSI
* extend "auth policy" vty command with new option "regexp"
* add vty command "authorized-regexp" for setting arbitrary POSIX
regular expression
* add basic vty test
* add optional "regexp" argument to subscriber-create-on-demand vty
command
With those in place we can now set the regexp against which MS's IMSI
will be matched.
If IMSI match the regexp than MS is allowed to access the network. If
subscriber is already marked as authorized in HLR than it'll be allowed
regardless of IMSI matching.
The same way we can decide whether to create subscribers on-demand
basesd on IMSI regexp match. Similar to authorization this restriction
can be overridden by manually creating subscriber via vty, ctrl
interface or directly in HLR.
Change-Id: I525f4b80676de47d1d422686da2ca012301b0129
Fixes: OS#1647
diff --git a/openbsc/src/libmsc/gsm_04_08.c b/openbsc/src/libmsc/gsm_04_08.c
index 74da34b..92c4cfe 100644
--- a/openbsc/src/libmsc/gsm_04_08.c
+++ b/openbsc/src/libmsc/gsm_04_08.c
@@ -25,9 +25,12 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <stdbool.h>
#include <errno.h>
#include <time.h>
#include <netinet/in.h>
+#include <regex.h>
+#include <sys/types.h>
#include "bscconfig.h"
@@ -244,6 +247,17 @@
return -EINVAL; /* not reached */
}
+static bool subscr_regexp_check(const struct gsm_network *net, const char *imsi)
+{
+ if (!net->authorized_reg_str)
+ return false;
+
+ if (regexec(&net->authorized_regexp, imsi, 0, NULL, 0) != REG_NOMATCH)
+ return true;
+
+ return false;
+}
+
static int authorize_subscriber(struct gsm_loc_updating_operation *loc,
struct gsm_subscriber *subscriber)
{
@@ -261,6 +275,13 @@
switch (subscriber->group->net->auth_policy) {
case GSM_AUTH_POLICY_CLOSED:
return subscriber->authorized;
+ case GSM_AUTH_POLICY_REGEXP:
+ if (subscriber->authorized)
+ return 1;
+ if (subscr_regexp_check(subscriber->group->net,
+ subscriber->imsi))
+ subscriber->authorized = 1;
+ return subscriber->authorized;
case GSM_AUTH_POLICY_TOKEN:
if (subscriber->authorized)
return subscriber->authorized;
@@ -509,10 +530,14 @@
static struct gsm_subscriber *subscr_create(const struct gsm_network *net,
const char *imsi)
{
- if (net->subscr_creation_mode != GSM_SUBSCR_DONT_CREATE)
- return subscr_create_subscriber(net->subscr_group, imsi);
+ if (net->subscr_creation_mode == GSM_SUBSCR_DONT_CREATE)
+ return NULL;
- return NULL;
+ if (net->subscr_creation_mode & GSM_SUBSCR_CREAT_W_REGEXP)
+ if (!subscr_regexp_check(net, imsi))
+ return NULL;
+
+ return subscr_create_subscriber(net->subscr_group, imsi);
}
/* Parse Chapter 9.2.11 Identity Response */