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netdev: move connect completion into netdev_connect_event
The duplicate/similar code in netdev_associate_event and netdev_connect_event leads to very hard to follow code, especially when you throw OWE/SAE/FILS or full mac cards into the mix. Currently these protocols finish the connection inside netdev_associate_event, and set ignore_connect_event. But for full mac cards we must finish the connection in netdev_connect_event. In attempt to simplify this, all connections will be completed and/or the 4-way started in netdev_connect_event. This satisfies both soft/full mac cards as well as simplifies the FT processing in netdev_associate_event. Since the FT IEs can be processed in netdev_connect_event (as they already are to support full mac) we can assume that any FT processing inside netdev_associate_event is for a fast transition, not initial mobility association. This simplifies netdev_ft_process_associate by removing all the blocks that would get hit if transition == false. Handling FT this way also fixes FT-SAE which was broken after the auth-proto changes since the initial mobility association was never processed if there was an auth-proto running.
This commit is contained in:
James Prestwood
Denis Kenzior
parent
e282d1fedf
commit
d1286200e9
168
src/netdev.c
168
src/netdev.c
@ -1548,7 +1548,6 @@ static bool netdev_ft_process_associate(struct netdev *netdev,
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const uint8_t *rsne = NULL;
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const uint8_t *mde = NULL;
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const uint8_t *fte = NULL;
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bool transition = netdev->in_ft;
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const uint8_t *sent_mde = hs->mde;
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bool is_rsn = hs->supplicant_ie != NULL;
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@ -1569,7 +1568,7 @@ static bool netdev_ft_process_associate(struct netdev *netdev,
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* — All other fields shall be identical to the contents of the RSNE
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* advertised by the target AP in Beacon and Probe Response frames."
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*/
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if (transition && is_rsn) {
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if (is_rsn) {
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struct ie_rsn_info msg4_rsne;
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if (!rsne)
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@ -1607,92 +1606,68 @@ static bool netdev_ft_process_associate(struct netdev *netdev,
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if (fte) {
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struct ie_ft_info ft_info;
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uint8_t mic[16];
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if (ie_parse_fast_bss_transition_from_data(fte, fte[1] + 2,
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&ft_info) < 0)
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return false;
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/* Validate the FTE contents */
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if (transition) {
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/*
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* In an RSN, check for an FT IE with the same
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* R0KH-ID, R1KH-ID, ANonce and SNonce that we
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* received in message 2, MIC Element Count
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* of 6 and the correct MIC.
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*/
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uint8_t mic[16];
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/*
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* In an RSN, check for an FT IE with the same
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* R0KH-ID, R1KH-ID, ANonce and SNonce that we
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* received in message 2, MIC Element Count
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* of 6 and the correct MIC.
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*/
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if (!ft_calculate_fte_mic(hs, 6, rsne, fte, NULL, mic))
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if (!ft_calculate_fte_mic(hs, 6, rsne, fte, NULL, mic))
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return false;
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if (ft_info.mic_element_count != 3 ||
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memcmp(ft_info.mic, mic, 16))
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return false;
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if (hs->r0khid_len != ft_info.r0khid_len ||
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memcmp(hs->r0khid, ft_info.r0khid,
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hs->r0khid_len) ||
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!ft_info.r1khid_present ||
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memcmp(hs->r1khid, ft_info.r1khid, 6))
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return false;
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if (memcmp(ft_info.anonce, hs->anonce, 32))
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return false;
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if (memcmp(ft_info.snonce, hs->snonce, 32))
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return false;
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if (ft_info.gtk_len) {
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uint8_t gtk[32];
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if (!handshake_decode_fte_key(hs, ft_info.gtk,
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ft_info.gtk_len,
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gtk))
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return false;
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if (ft_info.mic_element_count != 3 ||
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memcmp(ft_info.mic, mic, 16))
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if (ft_info.gtk_rsc[6] != 0x00 ||
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ft_info.gtk_rsc[7] != 0x00)
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return false;
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if (hs->r0khid_len != ft_info.r0khid_len ||
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memcmp(hs->r0khid, ft_info.r0khid,
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hs->r0khid_len) ||
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!ft_info.r1khid_present ||
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memcmp(hs->r1khid, ft_info.r1khid, 6))
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handshake_state_install_gtk(hs,
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ft_info.gtk_key_id,
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gtk, ft_info.gtk_len,
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ft_info.gtk_rsc, 6);
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}
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if (ft_info.igtk_len) {
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uint8_t igtk[16];
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if (!handshake_decode_fte_key(hs, ft_info.igtk,
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ft_info.igtk_len, igtk))
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return false;
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if (memcmp(ft_info.anonce, hs->anonce, 32))
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return false;
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if (memcmp(ft_info.snonce, hs->snonce, 32))
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return false;
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if (ft_info.gtk_len) {
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uint8_t gtk[32];
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if (!handshake_decode_fte_key(hs, ft_info.gtk,
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ft_info.gtk_len,
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gtk))
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return false;
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if (ft_info.gtk_rsc[6] != 0x00 ||
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ft_info.gtk_rsc[7] != 0x00)
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return false;
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handshake_state_install_gtk(hs,
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ft_info.gtk_key_id,
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gtk, ft_info.gtk_len,
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ft_info.gtk_rsc, 6);
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}
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if (ft_info.igtk_len) {
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uint8_t igtk[16];
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if (!handshake_decode_fte_key(hs, ft_info.igtk,
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ft_info.igtk_len, igtk))
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return false;
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handshake_state_install_igtk(hs,
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ft_info.igtk_key_id,
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igtk, ft_info.igtk_len,
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ft_info.igtk_ipn);
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}
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} else {
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/* Initial MD association */
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uint8_t zeros[32] = {};
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handshake_state_set_fte(hs, fte);
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/*
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* 12.4.2: "The FTE shall have a MIC information
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* element count of zero (i.e., no MIC present)
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* and have ANonce, SNonce, and MIC fields set to 0."
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*/
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if (ft_info.mic_element_count != 0 ||
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memcmp(ft_info.mic, zeros, 16) ||
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memcmp(ft_info.anonce, zeros, 32) ||
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memcmp(ft_info.snonce, zeros, 32))
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return false;
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handshake_state_set_kh_ids(hs, ft_info.r0khid,
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ft_info.r0khid_len,
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ft_info.r1khid);
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handshake_state_install_igtk(hs,
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ft_info.igtk_key_id,
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igtk, ft_info.igtk_len,
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ft_info.igtk_ipn);
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}
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}
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@ -2423,7 +2398,10 @@ static void netdev_associate_event(struct l_genl_msg *msg,
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netdev->sm = eapol_sm_new(netdev->handshake);
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eapol_register(netdev->sm);
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goto auth_complete;
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/* Just in case this was a retry */
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netdev->ignore_connect_event = false;
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return;
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} else if (ret == -EAGAIN) {
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/*
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* Here to support OWE retries. OWE will retry
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@ -2437,39 +2415,21 @@ static void netdev_associate_event(struct l_genl_msg *msg,
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goto assoc_failed;
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}
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if (!netdev_ft_process_associate(netdev, frame, frame_len,
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&status_code))
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goto assoc_failed;
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if (status_code != 0)
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goto assoc_failed;
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auth_complete:
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if (netdev->sm) {
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/*
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* Start processing EAPoL frames now that the state machine
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* has all the input data even in FT mode.
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*/
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if (!eapol_start(netdev->sm))
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goto assoc_failed;
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}
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/* Connection can be fully handled here, not in connect event */
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netdev->ignore_connect_event = true;
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if (netdev->in_ft) {
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bool is_rsn = netdev->handshake->supplicant_ie != NULL;
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if (!netdev_ft_process_associate(netdev, frame, frame_len,
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&status_code))
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goto assoc_failed;
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if (status_code != 0)
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goto assoc_failed;
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netdev->in_ft = false;
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if (is_rsn) {
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if (is_rsn)
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handshake_state_install_ptk(netdev->handshake);
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return;
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}
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} else if (netdev->sm)
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return;
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netdev_connect_ok(netdev);
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}
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return;
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