hlr_auc_gw: Allow Milenage RES length to be reduced
Some USIM use shorter RES length than the 64-bit default from Milenage.
Such cases did not interoperate with the hlr_auc_gw implementation. Make
it possible to configure the RES length 4..8 octets, i.e., 32 to 64
bits) to support such USIM.
Signed-off-by: Jouni Malinen <j@w1.fi>
diff --git a/hostapd/hlr_auc_gw.c b/hostapd/hlr_auc_gw.c
index 42d59db..8afe457 100644
--- a/hostapd/hlr_auc_gw.c
+++ b/hostapd/hlr_auc_gw.c
@@ -87,6 +87,7 @@
u8 amf[2];
u8 sqn[6];
int set;
+ size_t res_len;
};
static struct milenage_parameters *milenage_db = NULL;
@@ -96,6 +97,7 @@
#define EAP_AKA_RAND_LEN 16
#define EAP_AKA_AUTN_LEN 16
#define EAP_AKA_AUTS_LEN 14
+#define EAP_AKA_RES_MIN_LEN 4
#define EAP_AKA_RES_MAX_LEN 16
#define EAP_AKA_IK_LEN 16
#define EAP_AKA_CK_LEN 16
@@ -124,7 +126,8 @@
" ki CHAR(32) NOT NULL,"
" opc CHAR(32) NOT NULL,"
" amf CHAR(4) NOT NULL,"
- " sqn CHAR(12) NOT NULL"
+ " sqn CHAR(12) NOT NULL,"
+ " res_len INTEGER"
");";
printf("Adding database table for milenage information\n");
@@ -190,6 +193,10 @@
printf("Invalid sqn value in database\n");
return -1;
}
+
+ if (os_strcmp(col[i], "res_len") == 0 && argv[i]) {
+ m->res_len = atoi(argv[i]);
+ }
}
return 0;
@@ -206,8 +213,7 @@
os_snprintf(db_tmp_milenage.imsi, sizeof(db_tmp_milenage.imsi),
"%llu", imsi);
os_snprintf(cmd, sizeof(cmd),
- "SELECT ki,opc,amf,sqn FROM milenage WHERE imsi=%llu;",
- imsi);
+ "SELECT * FROM milenage WHERE imsi=%llu;", imsi);
if (sqlite3_exec(sqlite_db, cmd, get_milenage_cb, &db_tmp_milenage,
NULL) != SQLITE_OK)
return NULL;
@@ -424,7 +430,7 @@
while (fgets(buf, sizeof(buf), f)) {
line++;
- /* Parse IMSI Ki OPc AMF SQN */
+ /* Parse IMSI Ki OPc AMF SQN [RES_len] */
buf[sizeof(buf) - 1] = '\0';
if (buf[0] == '#')
continue;
@@ -515,7 +521,19 @@
ret = -1;
break;
}
- pos = pos2 + 1;
+
+ if (pos2) {
+ pos = pos2 + 1;
+ m->res_len = atoi(pos);
+ if (m->res_len &&
+ (m->res_len < EAP_AKA_RES_MIN_LEN ||
+ m->res_len > EAP_AKA_RES_MAX_LEN)) {
+ printf("%s:%d - Invalid RES_len (%s)\n",
+ fname, line, pos);
+ ret = -1;
+ break;
+ }
+ }
m->next = milenage_db;
milenage_db = m;
@@ -798,6 +816,10 @@
}
milenage_generate(m->opc, m->amf, m->ki, m->sqn, _rand,
autn, ik, ck, res, &res_len);
+ if (m->res_len >= EAP_AKA_RES_MIN_LEN &&
+ m->res_len <= EAP_AKA_RES_MAX_LEN &&
+ m->res_len < res_len)
+ res_len = m->res_len;
} else {
printf("Unknown IMSI: %s\n", imsi);
#ifdef AKA_USE_FIXED_TEST_VALUES
diff --git a/hostapd/hlr_auc_gw.milenage_db b/hostapd/hlr_auc_gw.milenage_db
index ecd06d7..c156a29 100644
--- a/hostapd/hlr_auc_gw.milenage_db
+++ b/hostapd/hlr_auc_gw.milenage_db
@@ -5,8 +5,10 @@
# authentication. In case of GSM/EAP-SIM, AMF and SQN values are not used, but
# dummy values will need to be included in this file.
-# IMSI Ki OPc AMF SQN
+# IMSI Ki OPc AMF SQN [RES_len]
232010000000000 90dca4eda45b53cf0f12d7c9c3bc6a89 cb9cccc4b9258e6dca4760379fb82581 61df 000000000000
+# Example using truncated 32-bit RES instead of 64-bit default
+232010000000001 90dca4eda45b53cf0f12d7c9c3bc6a89 cb9cccc4b9258e6dca4760379fb82581 61df 000000000000 4
# These values are from Test Set 19 which has the AMF separation bit set to 1
# and as such, is suitable for EAP-AKA' test.