msc: Cipher mode negotiation test
This adds a series of test cases that test various combinations of
A5/0, A5/1, A5/2 and A5/3 on both phone as well as network config
side.
Change-Id: I552fa4a23b7b65613a69b1a822e28e7dea401102
diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index a801e51..4f50b70 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -55,12 +55,58 @@
hexstring imsi,
hexstring msisdn,
OCT4 tmsi optional,
+ MobileStationClassmark1_V cm1,
BSSMAP_IE_ClassmarkInformationType2 cm2,
BSSMAP_IE_ClassmarkInformationType3 cm3 optional,
AuthVector vec optional,
BSC_ConnHdlrNetworkPars net
};
+/* get a one-octet bitmaks of supported algorithms based on Classmark information */
+function f_alg_mask_from_cm(BSSMAP_IE_ClassmarkInformationType2 cm2) return OCT1 {
+ var BIT8 res := '00000001'B; /* A5/0 always supported */
+
+ if (cm2.a5_1 == '0'B) {
+ res := res or4b '00000010'B;
+ }
+ if (cm2.classmarkInformationType2_oct5.a5_2 == '1'B ) {
+ res := res or4b '00000100'B;
+ }
+ if (cm2.classmarkInformationType2_oct5.a5_3 == '1'B) {
+ res := res or4b '00001000'B;
+ }
+ /* TODO: CM3 for A5/4 and beyond */
+ return bit2oct(res);
+}
+
+/* determine the best algorithm available within the bit-mask */
+function f_best_alg_from_mask(OCT1 alg_in) return OCT1 {
+ var BIT8 alg := oct2bit(alg_in);
+ var BIT8 ordered_algs[8] := {
+ '10000000'B, '01000000'B, '00100000'B, '00010000'B,
+ '00001000'B, /* A5/3 */
+ '00000010'B, /* A5/1 */
+ '00000100'B, /* A5/2 */
+ '00000001'B /* A5/0 */ }
+ for (var integer i := 0; i < sizeof(ordered_algs); i := i+1) {
+ if (alg and4b ordered_algs[i] != '00000000'B) {
+ return bit2oct(ordered_algs[i]);
+ }
+ }
+ return '00'O;
+}
+
+/* return an integer like '1' for A5/1 based on a mask (with only one bit set */
+function f_alg_from_mask(OCT1 mask_in) return integer {
+ var BIT8 mask := oct2bit(mask_in);
+ for (var integer i := 0; i < 8; i := i+1) {
+ if (mask and4b ('00000001'B << i) != '00000000'B) {
+ return i;
+ }
+ }
+ return -1;
+}
+
/* altstep for the global guard timer */
private altstep as_Tguard() runs on BSC_ConnHdlr {
[] g_Tguard.timeout {
@@ -172,26 +218,26 @@
/* build a PDU_ML3_MS_NW containing a Location Update by IMSI */
-function f_build_lu_imsi(hexstring imsi) return PDU_ML3_MS_NW
+function f_build_lu_imsi(hexstring imsi) runs on BSC_ConnHdlr return PDU_ML3_MS_NW
{
var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(imsi));
return f_build_lu(mi);
}
-function f_build_lu_imei(hexstring imei) return PDU_ML3_MS_NW
+function f_build_lu_imei(hexstring imei) runs on BSC_ConnHdlr return PDU_ML3_MS_NW
{
var MobileIdentityLV mi := valueof(ts_MI_IMEI_LV(imei));
return f_build_lu(mi);
}
-function f_build_lu_tmsi(OCT4 tmsi) return PDU_ML3_MS_NW
+function f_build_lu_tmsi(OCT4 tmsi) runs on BSC_ConnHdlr return PDU_ML3_MS_NW
{
var MobileIdentityLV mi := valueof(ts_MI_TMSI_LV(tmsi));
return f_build_lu(mi);
}
-private function f_build_lu(MobileIdentityLV mi) return PDU_ML3_MS_NW
+private function f_build_lu(MobileIdentityLV mi) runs on BSC_ConnHdlr return PDU_ML3_MS_NW
{
var LocationAreaIdentification_V old_lai := { '62F220'O, '9999'O };
var PDU_ML3_MS_NW l3_info := valueof(ts_ML3_MO_LU_Req(valueof(ts_ML3_IE_LuType_Attach),
- old_lai, mi, valueof(ts_CM1)));
+ old_lai, mi, g_pars.cm1));
return l3_info;
}
@@ -213,7 +259,7 @@
}
-function f_mm_common() runs on BSC_ConnHdlr
+function f_mm_auth() runs on BSC_ConnHdlr
{
if (g_pars.net.expect_auth) {
g_pars.vec := f_gen_auth_vec_2g();
@@ -226,10 +272,26 @@
BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_MM_AUTH_REQ(g_pars.vec.rand)));
BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MT_MM_AUTH_RESP_2G(g_pars.vec.sres)));
}
+}
+function f_mm_common() runs on BSC_ConnHdlr
+{
+ f_mm_auth();
if (g_pars.net.expect_ciph) {
- BSSAP.receive(tr_BSSMAP_CipherModeCmd(?, g_pars.vec.kc));
- BSSAP.send(ts_BSSMAP_CipherModeCompl('02'O));
+ var OCT1 a5_net := f_alg_mask_from_cm(g_pars.cm2);
+ var OCT1 a5_intersect := g_pars.net.kc_support and4b a5_net;
+ alt {
+ [] BSSAP.receive(tr_BSSMAP_CipherModeCmd(a5_intersect, g_pars.vec.kc)) {
+ var OCT1 a5_chosen := f_best_alg_from_mask(a5_intersect);
+ var integer a5_nr := f_alg_from_mask(a5_chosen);
+ BSSAP.send(ts_BSSMAP_CipherModeCompl(int2oct(a5_nr+1, 1)));
+ }
+ [] BSSAP.receive(tr_BSSMAP_CipherModeCmd(?, g_pars.vec.kc)) {
+ setverdict(fail, "Wrong ciphering algorithm mask in CiphModCmd");
+ self.stop;
+ }
+ }
+ /* FIXME: Send the best available algorithm */
}
}