TDLS: Use more thorough validation of TPK handshake
This commit is contained in:
Jouni Malinen
Jouni Malinen
parent
f0bfbe2a6c
commit
1c0b2ad1ce
1 changed files with 114 additions and 67 deletions
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@ -139,7 +139,7 @@ static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
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{
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if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
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0, 0, NULL, 0, NULL, 0) < 0) {
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wpa_printf(MSG_WARNING, "TDLS: Failed to delete PTK-TK from "
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wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
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"the driver");
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return -1;
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}
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@ -793,6 +793,9 @@ skip_ftie:
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static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst,
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u8 tdls_action, u8 dialog_token, u16 status)
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{
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wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR
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" (action=%u status=%u)",
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MAC2STR(dst), tdls_action, status);
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return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status,
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NULL, 0);
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}
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@ -1155,6 +1158,10 @@ static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
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#endif
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u8 dtoken;
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u16 ielen;
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u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
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if (len < 3 + 3)
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return -1;
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cpos = buf;
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cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
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@ -1168,47 +1175,54 @@ static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
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ielen = len - (cpos - buf); /* start of IE in buf */
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if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) {
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wpa_printf(MSG_INFO, "TDLS: Failed to parse KDEs in TPK M1");
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return -1;
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wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1");
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goto error;
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}
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if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
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wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M1");
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return -1;
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wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
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"TPK M1");
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goto error;
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}
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wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
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kde.lnkid, kde.lnkid_len);
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lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
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if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
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wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
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wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE,
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dtoken, WLAN_STATUS_NOT_IN_SAME_BSS);
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return -1;
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status = WLAN_STATUS_NOT_IN_SAME_BSS;
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goto error;
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}
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wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
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MAC2STR(src_addr));
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if (!wpa_tdls_get_privacy(sm))
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if (!wpa_tdls_get_privacy(sm)) {
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if (kde.rsn_ie) {
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wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
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"security is disabled");
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status = WLAN_STATUS_SECURITY_DISABLED;
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goto error;
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}
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goto skip_rsn;
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if (kde.ftie == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M1");
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return -1;
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}
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ftie = (struct wpa_tdls_ftie *) kde.ftie;
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if (kde.rsn_ie == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M1");
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return -1;
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if (kde.ftie == NULL || kde.rsn_ie == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
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status = WLAN_STATUS_INVALID_PARAMETERS;
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goto error;
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}
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if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
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wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
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"TPK M1");
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return -1;
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status = WLAN_STATUS_INVALID_RSNIE;
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goto error;
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}
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if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
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wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1");
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return -1;
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status = WLAN_STATUS_INVALID_RSNIE;
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goto error;
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}
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cipher = ie.pairwise_cipher;
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@ -1217,10 +1231,32 @@ static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
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cipher = WPA_CIPHER_CCMP;
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} else {
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wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1");
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wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE,
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dtoken,
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WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID);
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return -1;
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status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
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goto error;
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}
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if ((ie.capabilities &
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(WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
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WPA_CAPABILITY_PEERKEY_ENABLED) {
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wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
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"TPK M1");
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status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
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goto error;
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}
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/* Lifetime */
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if (kde.key_lifetime == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
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status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
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goto error;
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}
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timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
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lifetime = WPA_GET_LE32(timeoutie->value);
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wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
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if (lifetime < 300) {
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wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
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status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
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goto error;
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}
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skip_rsn:
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@ -1238,7 +1274,7 @@ skip_rsn:
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MAC2STR(src_addr));
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peer = os_malloc(sizeof(*peer));
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if (peer == NULL)
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return -1;
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goto error;
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os_memset(peer, 0, sizeof(*peer));
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os_memcpy(peer->addr, src_addr, ETH_ALEN);
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peer->next = sm->tdls;
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@ -1282,6 +1318,7 @@ skip_rsn:
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goto skip_rsn_check;
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}
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ftie = (struct wpa_tdls_ftie *) kde.ftie;
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os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
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os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
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peer->rsnie_i_len = kde.rsn_ie_len;
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@ -1291,7 +1328,7 @@ skip_rsn:
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wpa_msg(sm->ctx->ctx, MSG_WARNING,
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"TDLS: Failed to get random data for responder nonce");
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wpa_tdls_peer_free(sm, peer);
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return -1;
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goto error;
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}
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#if 0
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@ -1336,19 +1373,9 @@ skip_rsn:
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os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
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peer->rsnie_p_len = peer->rsnie_i_len;
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wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for PTK handshake",
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wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
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peer->rsnie_p, peer->rsnie_p_len);
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/* Lifetime */
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if (kde.key_lifetime == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
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return -1;
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}
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timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
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lifetime = WPA_GET_LE32(timeoutie->value);
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wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
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if (lifetime < 300)
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lifetime = 300; /* minimum seconds */
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peer->lifetime = lifetime;
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wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
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@ -1358,6 +1385,11 @@ skip_rsn_check:
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wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer);
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return 0;
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error:
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wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken,
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status);
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return -1;
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}
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@ -1409,12 +1441,14 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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status = WPA_GET_LE16(pos);
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pos += 2 /* status code */;
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if (status != 0) {
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if (status != WLAN_STATUS_SUCCESS) {
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wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
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status);
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return -1;
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}
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status = WLAN_STATUS_UNSPECIFIED_FAILURE;
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/* TODO: need to verify dialog token matches here or in kernel */
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dtoken = *pos++; /* dialog token */
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@ -1427,13 +1461,13 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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ielen = len - (pos - buf); /* start of IE in buf */
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if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) {
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wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2");
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return -1;
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goto error;
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}
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if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
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wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
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"TPK M2");
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return -1;
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goto error;
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}
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wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
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kde.lnkid, kde.lnkid_len);
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@ -1441,9 +1475,8 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
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wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
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wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM,
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dtoken, WLAN_STATUS_NOT_IN_SAME_BSS);
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return -1;
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status = WLAN_STATUS_NOT_IN_SAME_BSS;
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goto error;
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}
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if (!wpa_tdls_get_privacy(sm)) {
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@ -1452,13 +1485,20 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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goto skip_rsn;
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}
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if (kde.rsn_ie == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M2");
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return -1;
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if (kde.ftie == NULL || kde.rsn_ie == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
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status = WLAN_STATUS_INVALID_PARAMETERS;
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goto error;
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}
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wpa_hexdump(MSG_DEBUG, "TDLS: RSNIE Received from TPK M2",
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wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
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kde.rsn_ie, kde.rsn_ie_len);
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/*
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* FIX: bitwise comparison of RSN IE is not the correct way of
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* validation this. It can be different, but certain fields must
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* match. Since we list only a single pairwise cipher in TPK M1, the
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* memcmp is likely to work in most cases, though.
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*/
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if (kde.rsn_ie_len != peer->rsnie_i_len ||
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os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
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wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
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@ -1467,34 +1507,26 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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peer->rsnie_i, peer->rsnie_i_len);
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wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
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kde.rsn_ie, kde.rsn_ie_len);
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wpa_tdls_send_error(sm, src_addr,
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WLAN_TDLS_SETUP_CONFIRM, dtoken,
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WLAN_STATUS_UNSUPPORTED_RSN_IE_VERSION);
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return -1;
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status = WLAN_STATUS_INVALID_RSNIE;
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goto error;
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}
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if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
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wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
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return -1;
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status = WLAN_STATUS_INVALID_RSNIE;
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goto error;
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}
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cipher = ie.pairwise_cipher;
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if (cipher & WPA_CIPHER_CCMP) {
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if (cipher == WPA_CIPHER_CCMP) {
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wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
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cipher = WPA_CIPHER_CCMP;
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} else {
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wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
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wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM,
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dtoken,
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WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID);
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return -1;
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status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
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goto error;
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}
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if (kde.ftie == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M2");
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return -1;
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}
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wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
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kde.ftie, sizeof(*ftie));
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ftie = (struct wpa_tdls_ftie *) kde.ftie;
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@ -1502,6 +1534,7 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
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wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
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"not match with FTIE SNonce used in TPK M1");
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/* Silently discard the frame */
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return -1;
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}
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@ -1514,7 +1547,8 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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/* Lifetime */
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if (kde.key_lifetime == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
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return -1;
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status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
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goto error;
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}
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timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
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lifetime = WPA_GET_LE32(timeoutie->value);
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@ -1523,9 +1557,8 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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if (lifetime != peer->lifetime) {
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wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
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"TPK M2 (expected %u)", lifetime, peer->lifetime);
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wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM,
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dtoken, WLAN_STATUS_UNACCEPTABLE_LIFETIME);
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return -1;
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status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
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goto error;
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}
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wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
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@ -1533,6 +1566,7 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
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/* Process MIC check to see if TPK M2 is right */
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if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
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(u8 *) timeoutie, ftie) < 0) {
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/* Discard the frame */
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wpa_tdls_del_key(sm, peer);
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wpa_tdls_peer_free(sm, peer);
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return -1;
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@ -1550,6 +1584,11 @@ skip_rsn:
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wpa_tdls_enable_link(sm, peer);
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return 0;
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error:
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wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken,
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status);
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return -1;
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}
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@ -1579,6 +1618,8 @@ static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
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}
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wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
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if (len < 3 + 3)
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return -1;
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pos = buf;
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pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
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@ -1622,11 +1663,17 @@ static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
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ftie = (struct wpa_tdls_ftie *) kde.ftie;
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if (kde.rsn_ie == NULL) {
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wpa_printf(MSG_INFO, "TDLS: No RSN IE KDE in TPK M3");
|
||||
wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
|
||||
return -1;
|
||||
}
|
||||
wpa_hexdump(MSG_DEBUG, "TDLS: RSNIE Received from TPK M3",
|
||||
wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
|
||||
kde.rsn_ie, kde.rsn_ie_len);
|
||||
if (kde.rsn_ie_len != peer->rsnie_p_len ||
|
||||
os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
|
||||
wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
|
||||
"with the one sent in TPK M2");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
|
||||
wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
|
||||
|
|
|
|||
Loading…
Reference in a new issue