diff options
Diffstat (limited to 'src/gsm/auth_milenage.c')
| -rw-r--r-- | src/gsm/auth_milenage.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/gsm/auth_milenage.c b/src/gsm/auth_milenage.c index 1635ac6b..e1807621 100644 --- a/src/gsm/auth_milenage.c +++ b/src/gsm/auth_milenage.c @@ -30,10 +30,14 @@ static int milenage_gen_vec(struct osmo_auth_vector *vec, const uint8_t *_rand) { size_t res_len = sizeof(vec->res); + uint64_t next_sqn; uint8_t sqn[6]; int rc; - osmo_store64be_ext(aud->u.umts.sqn, sqn, 6); + /* keep the incremented SQN local until gsm_milenage() succeeded. */ + next_sqn = aud->u.umts.sqn + 1; + + osmo_store64be_ext(next_sqn, sqn, 6); milenage_generate(aud->u.umts.opc, aud->u.umts.amf, aud->u.umts.k, sqn, _rand, vec->autn, vec->ik, vec->ck, vec->res, &res_len); @@ -43,7 +47,9 @@ static int milenage_gen_vec(struct osmo_auth_vector *vec, return rc; vec->auth_types = OSMO_AUTH_TYPE_UMTS | OSMO_AUTH_TYPE_GSM; - aud->u.umts.sqn++; + + /* for storage in the caller's AUC database */ + aud->u.umts.sqn = next_sqn; return 0; } @@ -72,7 +78,7 @@ static int milenage_gen_vec_auts(struct osmo_auth_vector *vec, if (rc < 0) return rc; - aud->u.umts.sqn = 1 + (osmo_load64be_ext(sqn_out, 6) >> 16); + aud->u.umts.sqn = osmo_load64be_ext(sqn_out, 6) >> 16; return milenage_gen_vec(vec, aud, _rand); } |