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https://github.com/open5gs/open5gs.git
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mme: handle malformed CreateSessionResponse without aborting
Replace fatal asserts in mme_s11_handle_create_session_response() with validation and a unified failure path. - Reject malformed/invalid IEs (Cause, TEID, PAA, AMBR, Bearer QoS) instead of aborting the MME process - Fix Bearer QoS length handling: treat mismatch as invalid IE and fail gracefully - Consolidate error handling via mme_s11_create_session_fail() and goto fail This prevents remote crashes triggered by malformed GTPv2-C CreateSessionResponse messages on S11. Issues: #4284
This commit is contained in:
Sukchan Lee
parent
bd5f9b567d
commit
fba2cbd29d
1 changed files with 156 additions and 136 deletions
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@ -173,12 +173,47 @@ void mme_s11_handle_echo_response(
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/* Not Implemented */
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}
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static void mme_s11_create_session_fail(
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enb_ue_t *enb_ue, mme_ue_t *mme_ue,
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int create_action, uint8_t fail_cause,
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const char *reason)
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{
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int r;
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ogs_assert(mme_ue);
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if (reason)
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ogs_error("[%s] CreateSessionResponse failure: %s [Cause:%d]",
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mme_ue->imsi_bcd, reason, fail_cause);
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else
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ogs_error("[%s] CreateSessionResponse failure [Cause:%d]",
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mme_ue->imsi_bcd, fail_cause);
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if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
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r = nas_eps_send_attach_reject(enb_ue, mme_ue,
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OGS_NAS_EMM_CAUSE_NETWORK_FAILURE,
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OGS_NAS_ESM_CAUSE_NETWORK_FAILURE);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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} else if (create_action == OGS_GTP_CREATE_IN_TRACKING_AREA_UPDATE) {
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r = nas_eps_send_tau_reject(enb_ue, mme_ue,
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OGS_NAS_EMM_CAUSE_NETWORK_FAILURE);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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if (enb_ue)
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mme_send_delete_session_or_mme_ue_context_release(enb_ue, mme_ue);
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else
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ogs_error("No S1 Context");
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}
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void mme_s11_handle_create_session_response(
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ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
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ogs_gtp2_create_session_response_t *rsp)
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{
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int i, r, rv;
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uint8_t cause_value = OGS_GTP2_CAUSE_UNDEFINED_VALUE;
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uint8_t fail_cause = OGS_GTP2_CAUSE_REQUEST_REJECTED_REASON_NOT_SPECIFIED;
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uint8_t session_cause = OGS_GTP2_CAUSE_UNDEFINED_VALUE;
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uint8_t bearer_cause = OGS_GTP2_CAUSE_UNDEFINED_VALUE;
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ogs_gtp2_f_teid_t *sgw_s11_teid = NULL;
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@ -196,6 +231,7 @@ void mme_s11_handle_create_session_response(
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ogs_gtp2_ambr_t *ambr = NULL;
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uint16_t decoded = 0;
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int create_action = 0;
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const char *fail_reason = NULL;
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ogs_assert(rsp);
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@ -206,6 +242,7 @@ void mme_s11_handle_create_session_response(
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********************/
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ogs_assert(xact);
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create_action = xact->create_action;
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sess = mme_sess_find_by_id(OGS_POINTER_TO_UINT(xact->data));
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if (sess)
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mme_ue = mme_ue_find_by_id(sess->mme_ue_id);
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@ -231,63 +268,64 @@ void mme_s11_handle_create_session_response(
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ogs_error("MME-UE Context has already been removed");
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return;
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}
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source_ue = sgw_ue_find_by_id(mme_ue->sgw_ue_id);
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ogs_assert(source_ue);
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if (!source_ue) {
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fail_reason = "No SGW UE Context";
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fail_cause = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
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goto fail;
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}
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if (create_action == OGS_GTP_CREATE_IN_PATH_SWITCH_REQUEST) {
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target_ue = sgw_ue_find_by_id(source_ue->target_ue_id);
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ogs_assert(target_ue);
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if (!target_ue) {
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fail_reason = "No target SGW UE Context";
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fail_cause = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
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goto fail;
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}
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} else {
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target_ue = source_ue;
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ogs_assert(target_ue);
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}
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/************************
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* Getting Cause Value
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************************/
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if (rsp->cause.presence && rsp->cause.data) {
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if (rsp->cause.presence == 0) {
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
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fail_reason = "Mandatory IE missing";
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goto fail;
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}
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if (rsp->cause.data) {
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ogs_gtp2_cause_t *cause = rsp->cause.data;
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ogs_assert(cause);
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session_cause = cause->value;
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} else {
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_INCORRECT;
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fail_reason = "Invalid Cause IE";
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goto fail;
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}
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/************************
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* Check MME-UE Context
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************************/
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cause_value = OGS_GTP2_CAUSE_REQUEST_ACCEPTED;
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if (!mme_ue_from_teid) {
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ogs_error("[%s] No Context in TEID [Cause:%d]",
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mme_ue->imsi_bcd, session_cause);
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cause_value = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
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}
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if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
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if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
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ogs_error("[%s] Attach reject [Cause:%d]",
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mme_ue->imsi_bcd, session_cause);
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r = nas_eps_send_attach_reject(enb_ue, mme_ue,
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OGS_NAS_EMM_CAUSE_NETWORK_FAILURE,
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OGS_NAS_ESM_CAUSE_NETWORK_FAILURE);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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if (enb_ue)
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mme_send_delete_session_or_mme_ue_context_release(enb_ue, mme_ue);
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else
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ogs_error("No S1 Context");
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return;
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fail_cause = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
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fail_reason = "No Context in TEID";
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goto fail;
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}
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/*****************************************
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* Check Mandatory/Conditional IE Missing
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*****************************************/
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ogs_assert(cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED);
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if (rsp->sender_f_teid_for_control_plane.presence == 0) {
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ogs_error("[%s] No S11 TEID [Cause:%d]",
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mme_ue->imsi_bcd, session_cause);
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cause_value = OGS_GTP2_CAUSE_CONDITIONAL_IE_MISSING;
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fail_cause = OGS_GTP2_CAUSE_CONDITIONAL_IE_MISSING;
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fail_reason = "Conditional IE missing";
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goto fail;
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}
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switch (create_action) {
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@ -295,65 +333,40 @@ void mme_s11_handle_create_session_response(
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/* No need for PAA or S5C TEID in PathSwitchRequest */
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break;
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case OGS_GTP_CREATE_IN_TRACKING_AREA_UPDATE:
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/* No need for PAA or S5C TEID in 2G->4G mobility, it was already provided by SGSN peer */
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/* 2G->4G mobility: PAA/S5C TEID may already exist from SGSN */
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break;
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default:
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if (rsp->pgw_s5_s8__s2a_s2b_f_teid_for_pmip_based_interface_or_for_gtp_based_control_plane_interface.presence == 0) {
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ogs_error("[%s] No S5C TEID [Cause:%d]",
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mme_ue->imsi_bcd, session_cause);
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cause_value = OGS_GTP2_CAUSE_CONDITIONAL_IE_MISSING;
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fail_cause = OGS_GTP2_CAUSE_CONDITIONAL_IE_MISSING;
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fail_reason = "Conditional IE missing";
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goto fail;
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}
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if (rsp->pdn_address_allocation.presence == 0) {
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ogs_error("[%s] No PDN Address Allocation [Cause:%d]",
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mme_ue->imsi_bcd, session_cause);
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cause_value = OGS_GTP2_CAUSE_CONDITIONAL_IE_MISSING;
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fail_cause = OGS_GTP2_CAUSE_CONDITIONAL_IE_MISSING;
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fail_reason = "Conditional IE missing";
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goto fail;
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}
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}
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if (rsp->cause.presence == 0) {
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ogs_error("[%s] No Cause [VALUE:%d]", mme_ue->imsi_bcd, session_cause);
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cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
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}
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if (rsp->pdn_address_allocation.presence) {
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if (rsp->pdn_address_allocation.len < OGS_PAA_IPV4_LEN ||
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rsp->pdn_address_allocation.len > OGS_PAA_IPV4V6_LEN) {
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ogs_error("Invalid PAA IE [Length:%d]",
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rsp->pdn_address_allocation.len);
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cause_value = OGS_GTP2_CAUSE_INVALID_LENGTH;
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fail_cause = OGS_GTP2_CAUSE_INVALID_LENGTH;
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fail_reason = "Invalid Length";
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goto fail;
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}
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}
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if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
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if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
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ogs_error("[%s] Attach reject [Cause:%d]",
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mme_ue->imsi_bcd, session_cause);
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r = nas_eps_send_attach_reject(enb_ue, mme_ue,
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OGS_NAS_EMM_CAUSE_NETWORK_FAILURE,
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OGS_NAS_ESM_CAUSE_NETWORK_FAILURE);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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} else if (create_action == OGS_GTP_CREATE_IN_TRACKING_AREA_UPDATE) {
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ogs_error("[%s] TAU reject [Cause:%d]",
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mme_ue->imsi_bcd, session_cause);
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r = nas_eps_send_tau_reject(enb_ue, mme_ue,
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OGS_NAS_EMM_CAUSE_NETWORK_FAILURE);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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if (enb_ue)
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mme_send_delete_session_or_mme_ue_context_release(enb_ue, mme_ue);
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else
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ogs_error("No S1 Context");
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return;
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}
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/********************
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* Check Cause Value
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********************/
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ogs_assert(cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED);
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for (i = 0; i < OGS_BEARER_PER_UE; i++) {
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ogs_gtp2_cause_t *cause = NULL;
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@ -361,28 +374,15 @@ void mme_s11_handle_create_session_response(
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break;
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}
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cause = rsp->bearer_contexts_created[i].cause.data;
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if (cause == NULL) {
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ogs_error("No Cause Data");
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continue;
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}
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ogs_assert(cause);
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bearer_cause = cause->value;
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if (bearer_cause != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
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ogs_error("[%s] GTP Bearer Cause [VALUE:%d]",
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mme_ue->imsi_bcd, bearer_cause);
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if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
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ogs_error("[%s] Attach reject", mme_ue->imsi_bcd);
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r = nas_eps_send_attach_reject(enb_ue, mme_ue,
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OGS_NAS_EMM_CAUSE_NETWORK_FAILURE,
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OGS_NAS_ESM_CAUSE_NETWORK_FAILURE);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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if (enb_ue)
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mme_send_delete_session_or_mme_ue_context_release(
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enb_ue, mme_ue);
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else
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ogs_error("No S1 Context");
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return;
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fail_cause = bearer_cause;
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fail_reason = "Bearer Context not accepted";
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goto fail;
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}
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}
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@ -393,75 +393,80 @@ void mme_s11_handle_create_session_response(
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session_cause !=
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OGS_GTP2_CAUSE_NEW_PDN_TYPE_DUE_TO_SINGLE_ADDRESS_BEARER_ONLY) {
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ogs_error("[%s] GTP Cause [VALUE:%d]", mme_ue->imsi_bcd, session_cause);
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if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
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ogs_error("[%s] Attach reject", mme_ue->imsi_bcd);
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r = nas_eps_send_attach_reject(enb_ue, mme_ue,
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OGS_NAS_EMM_CAUSE_NETWORK_FAILURE,
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OGS_NAS_ESM_CAUSE_NETWORK_FAILURE);
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ogs_expect(r == OGS_OK);
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ogs_assert(r != OGS_ERROR);
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}
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if (enb_ue)
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mme_send_delete_session_or_mme_ue_context_release(enb_ue, mme_ue);
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else
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ogs_error("No S1 Context");
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return;
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fail_cause = session_cause;
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fail_reason = "Session Cause not accepted";
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goto fail;
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}
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/********************
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* Check ALL Context
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********************/
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ogs_assert(sess);
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session = sess->session;
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ogs_assert(session);
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ogs_assert(mme_ue);
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ogs_assert(source_ue);
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ogs_assert(target_ue);
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if (!session) {
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fail_cause = OGS_GTP2_CAUSE_SYSTEM_FAILURE;
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fail_reason = "No Session";
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goto fail;
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}
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ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
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mme_ue->mme_s11_teid, target_ue->sgw_s11_teid);
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for (i = 0; i < OGS_BEARER_PER_UE; i++) {
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if (rsp->bearer_contexts_created[i].presence == 0) {
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if (rsp->bearer_contexts_created[i].presence == 0)
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break;
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}
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if (rsp->bearer_contexts_created[i].eps_bearer_id.presence == 0) {
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ogs_error("No EPS Bearer ID");
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break;
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
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fail_reason = "Missing EPS Bearer ID";
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goto fail;
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}
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if (rsp->bearer_contexts_created[i].s1_u_enodeb_f_teid.presence == 0) {
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ogs_error("No SGW-S1U TEID");
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break;
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
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fail_reason = "Missing SGW-S1U TEID";
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goto fail;
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}
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if (rsp->bearer_contexts_created[i].s5_s8_u_sgw_f_teid.presence == 0) {
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ogs_error("No PGW-S5U TEID");
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break;
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
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fail_reason = "Missing PGW-S5U TEID";
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goto fail;
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}
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/* EPS Bearer ID */
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bearer = mme_bearer_find_by_ue_ebi(mme_ue,
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rsp->bearer_contexts_created[i].eps_bearer_id.u8);
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if (!bearer) {
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if (enb_ue)
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mme_send_delete_session_or_mme_ue_context_release(
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enb_ue, mme_ue);
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else
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ogs_error("No S1 Context");
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return;
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ogs_error("[%s] Unknown EPS Bearer ID [%u]",
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mme_ue->imsi_bcd,
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rsp->bearer_contexts_created[i].eps_bearer_id.u8);
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_INCORRECT;
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fail_reason = "Unknown EPS Bearer ID";
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goto fail;
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}
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/* Data Plane(UL) : SGW-S1U */
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sgw_s1u_teid = rsp->bearer_contexts_created[i].s1_u_enodeb_f_teid.data;
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ogs_assert(sgw_s1u_teid);
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bearer->sgw_s1u_teid = be32toh(sgw_s1u_teid->teid);
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ogs_assert(OGS_OK ==
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ogs_gtp2_f_teid_to_ip(sgw_s1u_teid, &bearer->sgw_s1u_ip));
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if (OGS_OK !=
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ogs_gtp2_f_teid_to_ip(sgw_s1u_teid, &bearer->sgw_s1u_ip)) {
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_INCORRECT;
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fail_reason = "Invalid SGW-S1U TEID";
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goto fail;
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}
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/* Data Plane(UL) : PGW-S5U */
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pgw_s5u_teid = rsp->bearer_contexts_created[i].s5_s8_u_sgw_f_teid.data;
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ogs_assert(pgw_s5u_teid);
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bearer->pgw_s5u_teid = be32toh(pgw_s5u_teid->teid);
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ogs_assert(OGS_OK ==
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ogs_gtp2_f_teid_to_ip(pgw_s5u_teid, &bearer->pgw_s5u_ip));
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if (OGS_OK !=
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ogs_gtp2_f_teid_to_ip(pgw_s5u_teid, &bearer->pgw_s5u_ip)) {
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fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_INCORRECT;
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fail_reason = "Invalid PGW-S5U TEID";
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goto fail;
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}
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ogs_debug(" ENB_S1U_TEID[%d] SGW_S1U_TEID[%d] PGW_S5U_TEID[%d]",
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||||
bearer->enb_s1u_teid, bearer->sgw_s1u_teid, bearer->pgw_s5u_teid);
|
||||
|
|
@ -471,12 +476,20 @@ void mme_s11_handle_create_session_response(
|
|||
OGS_FSM_TRAN(&bearer->sm, esm_state_active);
|
||||
}
|
||||
|
||||
/* Bearer Level QoS */
|
||||
/* Bearer QoS */
|
||||
if (rsp->bearer_contexts_created[0].bearer_level_qos.presence) {
|
||||
decoded = ogs_gtp2_parse_bearer_qos(&bearer_qos,
|
||||
&rsp->bearer_contexts_created[0].bearer_level_qos);
|
||||
ogs_assert(decoded ==
|
||||
rsp->bearer_contexts_created[0].bearer_level_qos.len);
|
||||
if (decoded != rsp->bearer_contexts_created[0].bearer_level_qos.len) {
|
||||
ogs_error("[%s] Invalid Bearer QoS IE length [%u], decoded [%u]",
|
||||
mme_ue->imsi_bcd,
|
||||
rsp->bearer_contexts_created[0].bearer_level_qos.len,
|
||||
decoded);
|
||||
fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_INCORRECT;
|
||||
fail_reason = "Invalid Bearer QoS IE length";
|
||||
goto fail;
|
||||
}
|
||||
|
||||
session->qos.index = bearer_qos.qci;
|
||||
session->qos.arp.priority_level = bearer_qos.priority_level;
|
||||
session->qos.arp.pre_emption_capability =
|
||||
|
|
@ -487,14 +500,20 @@ void mme_s11_handle_create_session_response(
|
|||
|
||||
/* Control Plane(UL) : SGW-S11 */
|
||||
sgw_s11_teid = rsp->sender_f_teid_for_control_plane.data;
|
||||
ogs_assert(sgw_s11_teid);
|
||||
target_ue->sgw_s11_teid = be32toh(sgw_s11_teid->teid);
|
||||
|
||||
/* Control Plane(UL) : PGW-S5C */
|
||||
if (rsp->pgw_s5_s8__s2a_s2b_f_teid_for_pmip_based_interface_or_for_gtp_based_control_plane_interface.presence) {
|
||||
pgw_s5c_teid = rsp->pgw_s5_s8__s2a_s2b_f_teid_for_pmip_based_interface_or_for_gtp_based_control_plane_interface.data;
|
||||
ogs_assert(pgw_s5c_teid);
|
||||
sess->pgw_s5c_teid = be32toh(pgw_s5c_teid->teid);
|
||||
ogs_assert(OGS_OK ==
|
||||
ogs_gtp2_f_teid_to_ip(pgw_s5c_teid, &sess->pgw_s5c_ip));
|
||||
if (OGS_OK !=
|
||||
ogs_gtp2_f_teid_to_ip(pgw_s5c_teid, &sess->pgw_s5c_ip)) {
|
||||
fail_cause = OGS_GTP2_CAUSE_MANDATORY_IE_INCORRECT;
|
||||
fail_reason = "Invalid S5C TEID";
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
||||
/* PDN Addresss Allocation */
|
||||
|
|
@ -519,7 +538,7 @@ void mme_s11_handle_create_session_response(
|
|||
#endif
|
||||
}
|
||||
|
||||
/* ePCO */
|
||||
/* ePCO/PCO */
|
||||
if (rsp->extended_protocol_configuration_options.presence) {
|
||||
OGS_TLV_STORE_DATA(&sess->pgw_epco,
|
||||
&rsp->extended_protocol_configuration_options);
|
||||
|
|
@ -530,23 +549,10 @@ void mme_s11_handle_create_session_response(
|
|||
&rsp->protocol_configuration_options);
|
||||
}
|
||||
|
||||
/* Bearer QoS */
|
||||
if (rsp->bearer_contexts_created[0].bearer_level_qos.presence) {
|
||||
decoded = ogs_gtp2_parse_bearer_qos(&bearer_qos,
|
||||
&rsp->bearer_contexts_created[0].bearer_level_qos);
|
||||
ogs_assert(rsp->bearer_contexts_created[0].bearer_level_qos.len ==
|
||||
decoded);
|
||||
session->qos.index = bearer_qos.qci;
|
||||
session->qos.arp.priority_level = bearer_qos.priority_level;
|
||||
session->qos.arp.pre_emption_capability =
|
||||
bearer_qos.pre_emption_capability;
|
||||
session->qos.arp.pre_emption_vulnerability =
|
||||
bearer_qos.pre_emption_vulnerability;
|
||||
}
|
||||
|
||||
/* AMBR */
|
||||
if (rsp->aggregate_maximum_bit_rate.presence) {
|
||||
ambr = rsp->aggregate_maximum_bit_rate.data;
|
||||
ogs_assert(ambr);
|
||||
session->ambr.downlink = be32toh(ambr->downlink) * 1000;
|
||||
session->ambr.uplink = be32toh(ambr->uplink) * 1000;
|
||||
}
|
||||
|
|
@ -564,7 +570,13 @@ void mme_s11_handle_create_session_response(
|
|||
ogs_expect(r == OGS_OK);
|
||||
ogs_assert(r != OGS_ERROR);
|
||||
} else {
|
||||
ogs_assert(OGS_OK == sgsap_send_location_update_request(mme_ue));
|
||||
if (OGS_OK != sgsap_send_location_update_request(mme_ue)) {
|
||||
ogs_error("[%s] sgsap_send_location_update_request() failed",
|
||||
mme_ue->imsi_bcd);
|
||||
fail_cause = OGS_GTP2_CAUSE_SYSTEM_FAILURE;
|
||||
fail_reason = "SGs location update failed";
|
||||
goto fail;
|
||||
}
|
||||
}
|
||||
|
||||
} else if (create_action == OGS_GTP_CREATE_IN_TRACKING_AREA_UPDATE) {
|
||||
|
|
@ -591,6 +603,14 @@ void mme_s11_handle_create_session_response(
|
|||
ogs_fatal("Invalid Create Session Action[%d]", create_action);
|
||||
ogs_assert_if_reached();
|
||||
}
|
||||
|
||||
|
||||
return;
|
||||
|
||||
fail:
|
||||
mme_s11_create_session_fail(enb_ue, mme_ue,
|
||||
create_action, fail_cause, fail_reason);
|
||||
return;
|
||||
}
|
||||
|
||||
void mme_s11_handle_modify_bearer_response(
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue