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gprs: Change auth key for every new Iu connection

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This commit is contained in:
Daniel Willmann
2016-04-12 12:09:42 +02:00
parent edafdc14f3
commit 0f3bce4aef
1 changed files with 57 additions and 9 deletions
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66
openbsc/src/gprs/gprs_gmm.c
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@@ -115,8 +115,40 @@ int sgsn_ranap_iu_event(struct ue_conn_ctx *ctx, enum iu_event_type type, void *
rc = sgsn_ranap_rab_ass_resp(mm, (RANAP_RAB_SetupOrModifiedItemIEs_t *)data); rc = sgsn_ranap_rab_ass_resp(mm, (RANAP_RAB_SetupOrModifiedItemIEs_t *)data);
break; break;
case IU_EVENT_IU_RELEASE: case IU_EVENT_IU_RELEASE:
{
uint8_t tmp_rand[16];
struct osmo_auth_vector vec;
/* Ki 000102030405060708090a0b0c0d0e0f */
struct osmo_sub_auth_data auth = {
.type = OSMO_AUTH_TYPE_GSM,
.algo = OSMO_AUTH_ALG_COMP128v1,
.u.gsm.ki = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
0x0e, 0x0f
},
};
/* XXX: Hack to make 3G auth work with special SIM card */
mm->auth_state = SGSN_AUTH_AUTHENTICATE;
mm->is_authenticated = 0;
RAND_bytes(&tmp_rand, 16);
memset(&vec, 0, sizeof(vec));
osmo_auth_gen_vec(&vec, &auth, tmp_rand);
mm->auth_triplet.key_seq = 0;
memcpy(&mm->auth_triplet.rand, &tmp_rand, sizeof(tmp_rand));
memcpy(&mm->auth_triplet.sres, &vec.sres, sizeof(vec.sres));
memcpy(&mm->auth_triplet.kc, &vec.kc, sizeof(vec.kc));
/* Clean up ue_conn_ctx here */ /* Clean up ue_conn_ctx here */
LOGMMCTXP(LOGL_INFO, mm, "IU release\n"); LOGMMCTXP(LOGL_INFO, mm, "IU release\n");
rc = 0;
}
break; break;
case IU_EVENT_SECURITY_MODE_COMPLETE: case IU_EVENT_SECURITY_MODE_COMPLETE:
/* Continue authentication here */ /* Continue authentication here */
@@ -1076,18 +1108,34 @@ static int gsm48_rx_gmm_att_req(struct sgsn_mm_ctx *ctx, struct msgb *msg,
ctx->ra = ra_id; ctx->ra = ra_id;
if (ctx->ran_type == MM_CTX_T_GERAN_Gb) if (ctx->ran_type == MM_CTX_T_GERAN_Gb)
ctx->gb.cell_id = cid; ctx->gb.cell_id = cid;
else if (ctx->ran_type == MM_CTX_T_UTRAN_Iu) else if (ctx->ran_type == MM_CTX_T_UTRAN_Iu) {
{ uint8_t tmp_rand[16];
struct osmo_auth_vector vec;
/* Ki 000102030405060708090a0b0c0d0e0f */
struct osmo_sub_auth_data auth = {
.type = OSMO_AUTH_TYPE_GSM,
.algo = OSMO_AUTH_ALG_COMP128v1,
.u.gsm.ki = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
0x0e, 0x0f
},
};
//ctx->iu.sac = sac; //ctx->iu.sac = sac;
/* XXX: Hack to make 3G auth work with special SIM card */ /* XXX: Hack to make 3G auth work with special SIM card */
ctx->auth_state = SGSN_AUTH_AUTHENTICATE; ctx->auth_state = SGSN_AUTH_AUTHENTICATE;
/* Ki 000102030405060708090a0b0c0d0e0f */
ctx->auth_triplet = (struct gsm_auth_tuple ) { RAND_bytes(&tmp_rand, 16);
.key_seq = 0,
.rand = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }, memset(&vec, 0, sizeof(vec));
.sres = { 0x61, 0xb5, 0x69, 0xf5 }, osmo_auth_gen_vec(&vec, &auth, tmp_rand);
.kc = { 0xd9, 0xd9, 0xc2, 0xed, 0x62, 0x7d, 0x68, 0x00 },
};
ctx->auth_triplet.key_seq = 0;
memcpy(&ctx->auth_triplet.rand, &tmp_rand, sizeof(tmp_rand));
memcpy(&ctx->auth_triplet.sres, &vec.sres, sizeof(vec.sres));
memcpy(&ctx->auth_triplet.kc, &vec.kc, sizeof(vec.kc));
} }
/* Update MM Context with other data */ /* Update MM Context with other data */