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Merge branch 'bugfix/handle_no_pmkid_case_owe' into 'master'
Recompute keys in OWE incase of PMKID absence or mismatch Closes WIFIBUG-639 See merge request espressif/esp-idf!31854
This commit is contained in:
Jiang Jiang Jian
commit
9476733559
@ -2868,7 +2868,8 @@ int owe_process_assoc_resp(const u8 *rsn_ie, size_t rsn_len, const uint8_t *dh_i
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struct wpa_sm *sm;
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sm = get_wpa_sm();
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wpabuf_free(sm->owe_ie); //free the dh ie constructed in owe_build_assoc_req
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/* Deallocate the dh ie buffer constructed in owe_build_assoc_req */
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wpabuf_free(sm->owe_ie);
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sm->owe_ie = NULL;
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struct wpa_ie_data *parsed_rsn_data;
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@ -2882,121 +2883,129 @@ int owe_process_assoc_resp(const u8 *rsn_ie, size_t rsn_len, const uint8_t *dh_i
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goto fail;
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}
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if (dh_ie && MIN_DH_LEN(dh_len)) {
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wpa_printf(MSG_ERROR, "OWE: Invalid Diffie Hellman IE");
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goto fail;
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}
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if (!dh_ie && parsed_rsn_data->num_pmkid == 0) {
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wpa_printf(MSG_ERROR, "OWE: Assoc response should either have pmkid or DH IE");
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goto fail;
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}
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if (!sm->cur_pmksa) { /* No PMK caching */
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if (dh_ie == NULL) {
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goto fail;
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/* Check for PMK caching */
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if (sm->cur_pmksa && parsed_rsn_data && parsed_rsn_data->num_pmkid == 1 && parsed_rsn_data->pmkid) {
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if (os_memcmp(parsed_rsn_data->pmkid, sm->cur_pmksa->pmkid, OWE_PMKID_LEN) == 0) {
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wpa_printf(MSG_DEBUG, "OWE: Using PMK caching");
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wpa_sm_set_pmk_from_pmksa(sm);
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goto done;
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} else {
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/* If PMKID mismatches, derive keys again */
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wpa_printf(MSG_DEBUG, "OWE : Invalid PMKID in response");
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}
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dh_len += 2;
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}
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dh_ie += 3;
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dh_len -=3;
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group = WPA_GET_LE16(dh_ie);
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if (dh_ie == NULL) {
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wpa_printf(MSG_ERROR, "OWE: No Diffie Hellman IE in association response");
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goto fail;
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}
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if (dh_ie && MIN_DH_LEN(dh_len)) {
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wpa_printf(MSG_ERROR, "OWE: Invalid Diffie Hellman IE");
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goto fail;
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}
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/* Only group 19 is supported */
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if ((group != sm->owe_group) || (group != OWE_DH_GRP19)) {
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wpa_printf(MSG_ERROR, "OWE: Unexpected Diffie-Hellman group in response");
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goto fail;
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}
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/* If STA or AP does not have PMKID, or PMKID mismatches, proceed with normal association */
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dh_len += 2;
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prime_len = OWE_PRIME_LEN;
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dh_ie += 3;
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dh_len -=3;
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group = WPA_GET_LE16(dh_ie);
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/* Set peer's public key point and calculate shared secret */
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sh_secret = crypto_ecdh_set_peerkey(sm->owe_ecdh, 0, dh_ie+2, dh_len-2);
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sh_secret = wpabuf_zeropad(sh_secret, prime_len);
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if (!sh_secret) {
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wpa_printf(MSG_ERROR, "OWE: Invalid peer DH public key");
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goto fail;
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}
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/* Only group 19 is supported */
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if ((group != sm->owe_group) || (group != OWE_DH_GRP19)) {
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wpa_printf(MSG_ERROR, "OWE: Unexpected Diffie-Hellman group in response");
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goto fail;
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}
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wpa_hexdump_buf_key(MSG_DEBUG, "OWE: DH shared secret", sh_secret);
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pub = crypto_ecdh_get_pubkey(sm->owe_ecdh, 0);
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if (!pub) {
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wpa_printf(MSG_ERROR, "No own public key");
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wpabuf_free(sh_secret);
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goto fail;
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}
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prime_len = OWE_PRIME_LEN;
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/* PMKID = Truncate-128(Hash(C | A)) */
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addr[0] = wpabuf_head(pub);
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len[0] = wpabuf_len(pub);
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addr[1] = dh_ie + 2;
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len[1] = dh_len - 2;
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/* Set peer's public key point and calculate shared secret */
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sh_secret = crypto_ecdh_set_peerkey(sm->owe_ecdh, 0, dh_ie+2, dh_len-2);
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sh_secret = wpabuf_zeropad(sh_secret, prime_len);
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if (!sh_secret) {
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wpa_printf(MSG_ERROR, "OWE: Invalid peer DH public key");
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goto fail;
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}
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int res = sha256_vector(2, addr, len, pmkid);
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if (res < 0 ) {
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goto fail;
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}
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wpa_hexdump_buf_key(MSG_DEBUG, "OWE: DH shared secret", sh_secret);
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pub = crypto_ecdh_get_pubkey(sm->owe_ecdh, 0);
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if (!pub) {
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wpa_printf(MSG_ERROR, "No own public key");
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goto fail;
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}
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hash_len = SHA256_MAC_LEN;
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/* PMKID = Truncate-128(Hash(C | A)) */
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addr[0] = wpabuf_head(pub);
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len[0] = wpabuf_len(pub);
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addr[1] = dh_ie + 2;
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len[1] = dh_len - 2;
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pub = wpabuf_zeropad(pub, prime_len);
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int res = sha256_vector(2, addr, len, pmkid);
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if (res < 0 ) {
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goto fail;
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}
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/* prk = HKDF-extract(C | A | group, z) */
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hkey = wpabuf_alloc(wpabuf_len(pub) + dh_len - 2 + 2);
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hash_len = SHA256_MAC_LEN;
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wpabuf_put_buf(hkey, pub); /* C */
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wpabuf_free(pub);
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pub = wpabuf_zeropad(pub, prime_len);
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if (!pub) {
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goto fail;
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}
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wpabuf_put_data(hkey, dh_ie + 2, dh_len - 2); /* A */
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wpabuf_put_le16(hkey, sm->owe_group); /* group */
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/* prk = HKDF-extract(C | A | group, z) */
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hkey = wpabuf_alloc(wpabuf_len(pub) + dh_len - 2 + 2);
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if (!hkey) {
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goto fail;
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}
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res = hmac_sha256(wpabuf_head(hkey), wpabuf_len(hkey), wpabuf_head(sh_secret), wpabuf_len(sh_secret), prk);
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if (res < 0 ) {
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goto fail;
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}
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wpabuf_put_buf(hkey, pub); /* C */
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wpabuf_free(pub);
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hash_len = SHA256_MAC_LEN;
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wpabuf_put_data(hkey, dh_ie + 2, dh_len - 2); /* A */
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wpabuf_put_le16(hkey, sm->owe_group); /* group */
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wpabuf_free(hkey);
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wpabuf_free(sh_secret);
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res = hmac_sha256(wpabuf_head(hkey), wpabuf_len(hkey), wpabuf_head(sh_secret), wpabuf_len(sh_secret), prk);
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if (res < 0 ) {
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goto fail;
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}
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wpa_hexdump_key(MSG_DEBUG, "OWE: prk", prk, hash_len);
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hash_len = SHA256_MAC_LEN;
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/* PMK = HKDF-expand(prk, "OWE Key Generation", n) */
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res = hmac_sha256_kdf(prk, hash_len, NULL, (const u8 *)info,
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os_strlen(info), pmk, hash_len);
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if (res < 0 ) {
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goto fail;
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}
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wpabuf_free(hkey);
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wpabuf_clear_free(sh_secret);
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forced_memzero(prk, SHA256_MAC_LEN);
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wpa_hexdump(MSG_DEBUG, "OWE: PMKID", pmkid, OWE_PMKID_LEN);
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wpa_hexdump_key(MSG_DEBUG, "OWE: prk", prk, hash_len);
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os_memcpy(sm->pmk,pmk,hash_len);
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sm->pmk_len = hash_len;
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wpa_hexdump_key(MSG_DEBUG, "OWE: PMK", sm->pmk, sm->pmk_len);
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/* PMK = HKDF-expand(prk, "OWE Key Generation", n) */
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res = hmac_sha256_kdf(prk, hash_len, NULL, (const u8 *)info,
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os_strlen(info), pmk, hash_len);
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if (res < 0 ) {
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goto fail;
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}
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forced_memzero(prk, SHA256_MAC_LEN);
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wpa_hexdump(MSG_DEBUG, "OWE: PMKID", pmkid, OWE_PMKID_LEN);
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os_memcpy(sm->pmk,pmk,hash_len);
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sm->pmk_len = hash_len;
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wpa_hexdump_key(MSG_DEBUG, "OWE: PMK", sm->pmk, sm->pmk_len);
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pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, pmkid, NULL, 0,
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sm->bssid, sm->own_addr, sm->network_ctx, sm->key_mgmt);
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pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, pmkid, NULL, 0,
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sm->bssid, sm->own_addr, sm->network_ctx, sm->key_mgmt);
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goto done;
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} else { /* PMK caching */
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if (parsed_rsn_data && sm->cur_pmksa) {
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if (parsed_rsn_data->num_pmkid == 1 && parsed_rsn_data->pmkid) {
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if (os_memcmp(parsed_rsn_data->pmkid, sm->cur_pmksa->pmkid, OWE_PMKID_LEN) == 0) {
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wpa_printf(MSG_DEBUG, "OWE: Using PMK caching");
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wpa_sm_set_pmk_from_pmksa(sm);
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goto done;
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} else {
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wpa_printf(MSG_DEBUG, "OWE : Invalid PMKID in response");
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goto fail;
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}
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}
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}
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}
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done:
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os_free(parsed_rsn_data);
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return 0;
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fail:
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os_free(parsed_rsn_data);
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wpabuf_free(pub);
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wpabuf_free(hkey);
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wpabuf_clear_free(sh_secret);
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return -1;
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}
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#endif // CONFIG_OWE_STA
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