lynxis lazus has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/43455?usp=email )

Change subject: SGSN: f_service_request: fix required authentication when doing Service Request ......................................................................

SGSN: f_service_request: fix required authentication when doing Service Request

The authentication was broken before, because f_gmm_auth was consuming the SecurityModeCommand and it never ended in as_service_request().

Change-Id: I1a4248c93514293ffdcdf9b42857bffab1fb92d9 --- M sgsn/BSSGP_ConnHdlr.ttcn 1 file changed, 3 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/55/43455/1

diff --git a/sgsn/BSSGP_ConnHdlr.ttcn b/sgsn/BSSGP_ConnHdlr.ttcn index 8c12ea6..b19ce86 100644 --- a/sgsn/BSSGP_ConnHdlr.ttcn +++ b/sgsn/BSSGP_ConnHdlr.ttcn @@ -814,12 +814,14 @@ } }

+ /* f_gmm_auth can't be used because it consume the Security Command */ if (expect_auth) { - f_gmm_auth(umts_aka_challenge := true, ran_index := ran_index); + g_pars.vec := f_gen_auth_vec_3g(); }

alt { [] as_service_request(exp_service_acc := expect_service_acc, ran_index := ran_index) { setverdict(pass); } + [expect_auth] as_gmm_auth(umts_aka_challenge := true, ran_index := ran_index, expect_sai := true) { repeat; }; [not expect_auth] RAN_CONN.receive(tr_PDU_DTAP_PS_MT(tr_GMM_AUTH_REQ)) { Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Service Request: Unexpected GMM Auth Req");