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libosmo-gprs
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gmm: Tx Auth & Ciph Failure 

Change-Id: I3ebb3dba20010e57f29dd5b8bbec457c2b08a8e1
This commit is contained in:
Pau Espin 2023-05-26 14:40:39 +02:00
parent cd5810291e
commit 120401f60d
5 changed files with 68 additions and 3 deletions
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4
include/osmocom/gprs/gmm/gmm_pdu.h
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@ -3,6 +3,7 @@
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
struct gprs_gmm_entity;
enum gprs_gmm_upd_type;
@ -39,6 +40,9 @@ int gprs_gmm_build_detach_req(struct gprs_gmm_entity *gmme,
enum osmo_gprs_gmm_detach_poweroff_type poweroff_type,
struct msgb *msg);
int gprs_gmm_build_auth_ciph_fail(struct gprs_gmm_entity *gmme,
struct msgb *msg, enum gsm48_gmm_cause cause);
int gprs_gmm_build_rau_req(struct gprs_gmm_entity *gmme,
enum gprs_gmm_upd_type rau_type,
struct msgb *msg);

2
include/osmocom/gprs/gmm/gmm_private.h
View File

@ -12,6 +12,7 @@
#include <osmocom/core/endian.h>
#include <osmocom/core/tdef.h>
#include <osmocom/gsm/protocol/gsm_23_003.h>
#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
#include <osmocom/gprs/llc/llc_prim.h>
#include <osmocom/gprs/gmm/gmm.h>
@ -132,6 +133,7 @@ int gprs_gmm_tx_detach_req(struct gprs_gmm_entity *gmme,
enum osmo_gprs_gmm_detach_poweroff_type poweroff_type);
int gprs_gmm_tx_rau_req(struct gprs_gmm_entity *gmme, enum gprs_gmm_upd_type rau_type);
int gprs_gmm_tx_auth_ciph_resp(const struct gprs_gmm_entity *gmme, const uint8_t *sres);
int gprs_gmm_tx_auth_ciph_fail(struct gprs_gmm_entity *gmme, enum gsm48_gmm_cause cause);
int gprs_gmm_submit_gmmreg_attach_cnf(struct gprs_gmm_entity *gmme, bool accepted, uint8_t cause);
int gprs_gmm_submit_gmmsm_establish_cnf(struct gprs_gmm_entity *gmme, bool accepted, uint8_t cause);

45
src/gmm/gmm.c
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@ -704,6 +704,42 @@ static int gprs_gmm_tx_ptmsi_realloc_compl(struct gprs_gmm_entity *gmme)
return rc;
}
/* Tx GMM Authentication and Ciphering Failure, 9.4.10a */
int gprs_gmm_tx_auth_ciph_fail(struct gprs_gmm_entity *gmme, enum gsm48_gmm_cause cause)
{
struct osmo_gprs_llc_prim *llc_prim;
int rc;
struct msgb *msg;
LOGGMME(gmme, LOGL_INFO, "Tx GMM AUTHENTICATION AND CIPHERING FAILURE cause=0x%02x '%s'\n",
cause, get_value_string(gsm48_gmm_cause_names, cause));
llc_prim = osmo_gprs_llc_prim_alloc_ll_unitdata_req(
gmme->tlli, OSMO_GPRS_LLC_SAPI_GMM, NULL, GPRS_GMM_ALLOC_SIZE);
msg = llc_prim->oph.msg;
msg->l3h = msg->tail;
rc = gprs_gmm_build_auth_ciph_fail(gmme, msg, cause);
if (rc < 0) {
msgb_free(msg);
return -EBADMSG;
}
llc_prim->ll.l3_pdu = msg->l3h;
llc_prim->ll.l3_pdu_len = msgb_l3len(msg);
/* TODO:
llc_prim->ll.qos_params.*;
llc_prim->ll.radio_prio;
llc_prim->ll.apply_gea;
llc_prim->ll.apply_gia;
*/
/* invalidate active reference: */
gmme->auth_ciph.req.ac_ref_nr = 0xff;
rc = gprs_gmm_prim_call_llc_down_cb(llc_prim);
if (rc < 0)
return rc;
return rc;
}
/* Tx GMM Routing area update request, 9.4.14 */
int gprs_gmm_tx_rau_req(struct gprs_gmm_entity *gmme,
enum gprs_gmm_upd_type rau_type)
@ -1166,6 +1202,7 @@ static int gprs_gmm_rx_auth_ciph_req(struct gprs_gmm_entity *gmme, struct gsm48_
if (len < sizeof(*gh) + sizeof(*acreq)) {
LOGGMME(gmme, LOGL_ERROR, "Rx GMM AUTHENTICATION AND CIPHERING REQUEST with wrong size %u\n", len);
gprs_gmm_tx_auth_ciph_fail(gmme, GMM_CAUSE_SEM_INCORR_MSG);
return -EINVAL;
}
@ -1177,6 +1214,7 @@ static int gprs_gmm_rx_auth_ciph_req(struct gprs_gmm_entity *gmme, struct gsm48_
len - (sizeof(*gh) + sizeof(*acreq)));
if (rc < 0) {
LOGGMME(gmme, LOGL_ERROR, "Rx GMM AUTHENTICATION AND CIPHERING REQUEST: failed to parse TLVs %d\n", rc);
gprs_gmm_tx_auth_ciph_fail(gmme, GMM_CAUSE_COND_IE_ERR);
return -EINVAL;
}
if (TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_RAND)) {
@ -1206,14 +1244,17 @@ static int gprs_gmm_rx_auth_ciph_req(struct gprs_gmm_entity *gmme, struct gsm48_
if (rand) {
/* SIM AUTH needed. Answer GMM req asynchronously in GMMREG-SIM_AUTH.rsp: */
rc = gprs_gmm_submit_gmmreg_sim_auth_ind(gmme);
/* TODO: if rc < 0, transmit AUTHENTICATION AND CIPHERING FAILURE (9.4.10a) */
if (rc < 0) {
gprs_gmm_tx_auth_ciph_fail(gmme, GMM_CAUSE_GSM_AUTH_UNACCEPT);
return rc;
}
} else {
/* Submit LLGMM-ASSIGN-REQ as per TS 24.007 Annex C.1 */
rc = gprs_gmm_submit_llgmm_assing_req(gmme);
if (rc < 0) {
/* TODO: if rc < 0, transmit AUTHENTICATION AND CIPHERING FAILURE (9.4.10a) */
/* invalidate active reference: */
gmme->auth_ciph.req.ac_ref_nr = 0xff;
gprs_gmm_tx_auth_ciph_fail(gmme, GMM_CAUSE_MSG_INCOMP_P_STATE);
return rc;
}
rc = gprs_gmm_tx_auth_ciph_resp(gmme, NULL);

18
src/gmm/gmm_pdu.c
View File

@ -295,6 +295,24 @@ int gprs_gmm_build_ptmsi_realloc_compl(struct gprs_gmm_entity *gmme, struct msgb
return 0;
}
/* 9.4.10a Authentication and Ciphering Failure */
int gprs_gmm_build_auth_ciph_fail(struct gprs_gmm_entity *gmme, struct msgb *msg,
enum gsm48_gmm_cause cause)
{
struct gsm48_hdr *gh;
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_PTMSI_REALL_COMPL;
/* 10.5.5.14 Cause */
msgb_put_u8(msg, (uint8_t)cause);
/* TODO: 10.5.3.2.2 Authentication Failure parameter */
return 0;
}
/* Chapter 9.4.14: Routing area update request */
int gprs_gmm_build_rau_req(struct gprs_gmm_entity *gmme,
enum gprs_gmm_upd_type rau_type,

2
src/gmm/gmm_prim.c
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@ -447,9 +447,9 @@ static int gprs_gmm_prim_handle_gmmreg_sim_auth_resp(struct osmo_gprs_gmm_prim *
rc = gprs_gmm_submit_llgmm_assing_req(gmme);
if (rc < 0) {
/* TODO: if rc < 0, transmit AUTHENTICATION AND CIPHERING FAILURE (9.4.10a) */
/* invalidate active reference: */
gmme->auth_ciph.req.ac_ref_nr = 0xff;
gprs_gmm_tx_auth_ciph_fail(gmme, GMM_CAUSE_MSG_INCOMP_P_STATE);
return rc;
}