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authorJouni Malinen <j@w1.fi>2018-06-04 12:16:54 (GMT)
committerJouni Malinen <j@w1.fi>2018-06-05 16:29:53 (GMT)
commit994eac7e61f30972bf66ce62f2f25fbb44f41cbd (patch)
tree48aa28107463d113f33b9650b1e2b7a9c0531e5b /src/common
parent1655e81c978ce749d2d68a9ae83a5bcd434a1a35 (diff)
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FT: PMK-R0 derivation using SHA384-based AKM
Signed-off-by: Jouni Malinen <j@w1.fi>
Diffstat (limited to 'src/common')
-rw-r--r--src/common/wpa_common.c56
-rw-r--r--src/common/wpa_common.h3
2 files changed, 48 insertions, 11 deletions
diff --git a/src/common/wpa_common.c b/src/common/wpa_common.c
index 9a79e0c..02f5395 100644
--- a/src/common/wpa_common.c
+++ b/src/common/wpa_common.c
@@ -1420,24 +1420,36 @@ int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len,
int wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
const u8 *ssid, size_t ssid_len,
const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len,
- const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name)
+ const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name,
+ int use_sha384)
{
u8 buf[1 + SSID_MAX_LEN + MOBILITY_DOMAIN_ID_LEN + 1 +
FT_R0KH_ID_MAX_LEN + ETH_ALEN];
- u8 *pos, r0_key_data[48], hash[32];
+ u8 *pos, r0_key_data[64], hash[32];
const u8 *addr[2];
size_t len[2];
+ size_t q = use_sha384 ? 48 : 32;
+ size_t r0_key_data_len = q + 16;
/*
* R0-Key-Data = KDF-384(XXKey, "FT-R0",
* SSIDlength || SSID || MDID || R0KHlength ||
* R0KH-ID || S0KH-ID)
- * XXKey is either the second 256 bits of MSK or PSK.
- * PMK-R0 = L(R0-Key-Data, 0, 256)
- * PMK-R0Name-Salt = L(R0-Key-Data, 256, 128)
+ * XXKey is either the second 256 bits of MSK or PSK; or the first
+ * 384 bits of MSK for FT-EAP-SHA384.
+ * PMK-R0 = L(R0-Key-Data, 0, Q)
+ * PMK-R0Name-Salt = L(R0-Key-Data, Q, 128)
+ * Q = 384 for FT-EAP-SHA384; otherwise, 256
*/
if (ssid_len > SSID_MAX_LEN || r0kh_id_len > FT_R0KH_ID_MAX_LEN)
return -1;
+ wpa_printf(MSG_DEBUG, "FT: Derive PMK-R0 using KDF-%s",
+ use_sha384 ? "SHA384" : "SHA256");
+ wpa_hexdump_key(MSG_DEBUG, "FT: XXKey", xxkey, xxkey_len);
+ wpa_hexdump_ascii(MSG_DEBUG, "FT: SSID", ssid, ssid_len);
+ wpa_hexdump(MSG_DEBUG, "FT: MDID", mdid, MOBILITY_DOMAIN_ID_LEN);
+ wpa_hexdump_ascii(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
+ wpa_printf(MSG_DEBUG, "FT: S0KH-ID: " MACSTR, MAC2STR(s0kh_id));
pos = buf;
*pos++ = ssid_len;
os_memcpy(pos, ssid, ssid_len);
@@ -1450,22 +1462,46 @@ int wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
os_memcpy(pos, s0kh_id, ETH_ALEN);
pos += ETH_ALEN;
- if (sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf,
- r0_key_data, sizeof(r0_key_data)) < 0)
- return -1;
- os_memcpy(pmk_r0, r0_key_data, PMK_LEN);
+#ifdef CONFIG_SHA384
+ if (use_sha384) {
+ if (xxkey_len != SHA384_MAC_LEN) {
+ wpa_printf(MSG_ERROR,
+ "FT: Unexpected XXKey length %d (expected %d)",
+ (int) xxkey_len, SHA384_MAC_LEN);
+ return -1;
+ }
+ if (sha384_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf,
+ r0_key_data, r0_key_data_len) < 0)
+ return -1;
+ }
+#endif /* CONFIG_SHA384 */
+ if (!use_sha384) {
+ if (xxkey_len != PMK_LEN) {
+ wpa_printf(MSG_ERROR,
+ "FT: Unexpected XXKey length %d (expected %d)",
+ (int) xxkey_len, PMK_LEN);
+ return -1;
+ }
+ if (sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf,
+ r0_key_data, r0_key_data_len) < 0)
+ return -1;
+ }
+ os_memcpy(pmk_r0, r0_key_data, q);
+ wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, q);
+ wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0Name-Salt", &r0_key_data[q], 16);
/*
* PMKR0Name = Truncate-128(SHA-256("FT-R0N" || PMK-R0Name-Salt)
*/
addr[0] = (const u8 *) "FT-R0N";
len[0] = 6;
- addr[1] = r0_key_data + PMK_LEN;
+ addr[1] = &r0_key_data[q];
len[1] = 16;
if (sha256_vector(2, addr, len, hash) < 0)
return -1;
os_memcpy(pmk_r0_name, hash, WPA_PMK_NAME_LEN);
+ os_memset(r0_key_data, 0, sizeof(r0_key_data));
return 0;
}
diff --git a/src/common/wpa_common.h b/src/common/wpa_common.h
index 3843167..bb0765a 100644
--- a/src/common/wpa_common.h
+++ b/src/common/wpa_common.h
@@ -364,7 +364,8 @@ int wpa_ft_mic(const u8 *kck, size_t kck_len, const u8 *sta_addr,
int wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
const u8 *ssid, size_t ssid_len,
const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len,
- const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name);
+ const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name,
+ int use_sha384);
int wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
const u8 *s1kh_id, u8 *pmk_r1_name);
int wpa_derive_pmk_r1(const u8 *pmk_r0, size_t pmk_r0_len,