mirror of
https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-11-16 17:09:24 +01:00
netdev: external auth support
Certain FullMAC drivers do not expose CMD_ASSOCIATE/CMD_AUTHENTICATE, but lack the ability to fully offload SAE connections to the firmware. Such connections can still be supported on such firmware by using CMD_EXTERNAL_AUTH & CMD_FRAME. The firmware sets the NL80211_FEATURE_SAE bit (which implies support for CMD_AUTHENTICATE, but oh well), and no other offload extended features. When CMD_CONNECT is issued, the firmware sends CMD_EXTERNAL_AUTH via unicast to the owner of the connection. The connection owner is then expected to send SAE frames with the firmware using CMD_FRAME and receive authenticate frames using unicast CMD_FRAME notifications as well. Once SAE authentication completes, userspace is expected to send a final CMD_EXTERNAL_AUTH back to the kernel with the corresponding status code. On failure, a non-0 status code should be used. Note that for historical reasons, SAE AKM sent in CMD_EXTERNAL_AUTH is given in big endian order, not CPU order as is expected!
This commit is contained in:
Denis Kenzior
parent
acc5daf0e2
commit
354200f9da
257
src/netdev.c
257
src/netdev.c
@ -192,6 +192,7 @@ struct netdev {
|
||||
bool in_reassoc : 1;
|
||||
bool privacy : 1;
|
||||
bool cqm_poll_fallback : 1;
|
||||
bool external_auth : 1;
|
||||
};
|
||||
|
||||
struct netdev_preauth_state {
|
||||
@ -871,6 +872,7 @@ static void netdev_connect_free(struct netdev *netdev)
|
||||
netdev->expect_connect_failure = false;
|
||||
netdev->cur_rssi_low = false;
|
||||
netdev->privacy = false;
|
||||
netdev->external_auth = false;
|
||||
|
||||
if (netdev->connect_cmd) {
|
||||
l_genl_msg_unref(netdev->connect_cmd);
|
||||
@ -2478,7 +2480,10 @@ static struct l_genl_msg *netdev_build_cmd_connect(struct netdev *netdev,
|
||||
|
||||
switch (nhs->type) {
|
||||
case CONNECTION_TYPE_SOFTMAC:
|
||||
break;
|
||||
case CONNECTION_TYPE_FULLMAC:
|
||||
l_genl_msg_append_attr(msg,
|
||||
NL80211_ATTR_EXTERNAL_AUTH_SUPPORT, 0, NULL);
|
||||
break;
|
||||
case CONNECTION_TYPE_SAE_OFFLOAD:
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_SAE_PASSWORD,
|
||||
@ -3392,6 +3397,77 @@ static void netdev_fils_tx_associate(struct iovec *fils_iov, size_t n_fils_iov,
|
||||
}
|
||||
}
|
||||
|
||||
static void netdev_external_auth_frame_cb(struct l_genl_msg *msg,
|
||||
void *user_data)
|
||||
{
|
||||
int error = l_genl_msg_get_error(msg);
|
||||
|
||||
if (error < 0)
|
||||
l_debug("Failed to send External Auth Frame: %s(%d)",
|
||||
strerror(-error), -error);
|
||||
}
|
||||
|
||||
static void netdev_external_auth_sae_tx_authenticate(const uint8_t *body,
|
||||
size_t body_len, void *user_data)
|
||||
{
|
||||
struct netdev *netdev = user_data;
|
||||
struct handshake_state *hs = netdev->handshake;
|
||||
uint16_t frame_type = MPDU_MANAGEMENT_SUBTYPE_AUTHENTICATION << 4;
|
||||
struct iovec iov[2];
|
||||
struct l_genl_msg *msg;
|
||||
uint8_t algorithm[2] = { 0x03, 0x00 };
|
||||
|
||||
l_debug("");
|
||||
|
||||
iov[0].iov_base = &algorithm;
|
||||
iov[0].iov_len = sizeof(algorithm);
|
||||
iov[1].iov_base = (void *) body;
|
||||
iov[1].iov_len = body_len;
|
||||
|
||||
msg = nl80211_build_cmd_frame(netdev->index, frame_type,
|
||||
hs->spa, hs->aa, 0, iov, 2);
|
||||
|
||||
if (l_genl_family_send(nl80211, msg, netdev_external_auth_frame_cb,
|
||||
netdev, NULL) > 0)
|
||||
return;
|
||||
|
||||
l_genl_msg_unref(msg);
|
||||
}
|
||||
|
||||
static void netdev_external_auth_cb(struct l_genl_msg *msg, void *user_data)
|
||||
{
|
||||
int error = l_genl_msg_get_error(msg);
|
||||
|
||||
if (error < 0)
|
||||
l_debug("Failed to send External Auth: %s(%d)",
|
||||
strerror(-error), -error);
|
||||
}
|
||||
|
||||
static void netdev_send_external_auth(struct netdev *netdev,
|
||||
uint16_t status_code)
|
||||
{
|
||||
struct handshake_state *hs = netdev->handshake;
|
||||
struct l_genl_msg *msg =
|
||||
nl80211_build_external_auth(netdev->index, status_code,
|
||||
hs->ssid, hs->ssid_len, hs->aa);
|
||||
|
||||
if (l_genl_family_send(nl80211, msg, netdev_external_auth_cb,
|
||||
netdev, NULL) > 0)
|
||||
return;
|
||||
|
||||
l_genl_msg_unref(msg);
|
||||
}
|
||||
|
||||
static void netdev_external_auth_sae_tx_associate(void *user_data)
|
||||
{
|
||||
struct netdev *netdev = user_data;
|
||||
|
||||
l_debug("");
|
||||
|
||||
netdev_send_external_auth(netdev, MMPDU_STATUS_CODE_SUCCESS);
|
||||
netdev_ensure_eapol_registered(netdev);
|
||||
}
|
||||
|
||||
struct rtnl_data {
|
||||
struct netdev *netdev;
|
||||
uint8_t addr[ETH_ALEN];
|
||||
@ -3400,6 +3476,10 @@ struct rtnl_data {
|
||||
|
||||
static int netdev_begin_connection(struct netdev *netdev)
|
||||
{
|
||||
struct netdev_handshake_state *nhs =
|
||||
l_container_of(netdev->handshake,
|
||||
struct netdev_handshake_state, super);
|
||||
|
||||
if (netdev->connect_cmd) {
|
||||
netdev->connect_cmd_id = l_genl_family_send(nl80211,
|
||||
netdev->connect_cmd,
|
||||
@ -3419,7 +3499,7 @@ static int netdev_begin_connection(struct netdev *netdev)
|
||||
*/
|
||||
handshake_state_set_supplicant_address(netdev->handshake, netdev->addr);
|
||||
|
||||
if (netdev->ap) {
|
||||
if (netdev->ap && nhs->type == CONNECTION_TYPE_SOFTMAC) {
|
||||
if (!auth_proto_start(netdev->ap))
|
||||
goto failed;
|
||||
|
||||
@ -3870,7 +3950,11 @@ static int netdev_handshake_state_setup_connection_type(
|
||||
if (softmac && wiphy_has_feature(wiphy, NL80211_FEATURE_SAE))
|
||||
goto softmac;
|
||||
|
||||
return -EINVAL;
|
||||
/* FullMAC uses EXTERNAL_AUTH and reuses this feature bit */
|
||||
if (wiphy_has_feature(wiphy, NL80211_FEATURE_SAE))
|
||||
goto fullmac;
|
||||
|
||||
return -ENOTSUP;
|
||||
case IE_RSN_AKM_SUITE_FILS_SHA256:
|
||||
case IE_RSN_AKM_SUITE_FILS_SHA384:
|
||||
case IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA256:
|
||||
@ -3941,40 +4025,43 @@ static void netdev_connect_common(struct netdev *netdev,
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (nhs->type != CONNECTION_TYPE_SOFTMAC)
|
||||
if (!IE_AKM_IS_SAE(hs->akm_suite) ||
|
||||
nhs->type == CONNECTION_TYPE_SAE_OFFLOAD)
|
||||
goto build_cmd_connect;
|
||||
|
||||
switch (hs->akm_suite) {
|
||||
case IE_RSN_AKM_SUITE_SAE_SHA256:
|
||||
case IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256:
|
||||
if (nhs->type == CONNECTION_TYPE_SOFTMAC)
|
||||
netdev->ap = sae_sm_new(hs, netdev_sae_tx_authenticate,
|
||||
netdev_sae_tx_associate,
|
||||
netdev);
|
||||
netdev_sae_tx_associate,
|
||||
netdev);
|
||||
else
|
||||
netdev->ap =
|
||||
sae_sm_new(hs, netdev_external_auth_sae_tx_authenticate,
|
||||
netdev_external_auth_sae_tx_associate,
|
||||
netdev);
|
||||
|
||||
if (sae_sm_is_h2e(netdev->ap)) {
|
||||
uint8_t own_rsnxe[20];
|
||||
if (sae_sm_is_h2e(netdev->ap)) {
|
||||
uint8_t own_rsnxe[20];
|
||||
|
||||
if (wiphy_get_rsnxe(netdev->wiphy,
|
||||
own_rsnxe, sizeof(own_rsnxe))) {
|
||||
set_bit(own_rsnxe + 2, IE_RSNX_SAE_H2E);
|
||||
handshake_state_set_supplicant_rsnxe(hs,
|
||||
own_rsnxe);
|
||||
}
|
||||
}
|
||||
|
||||
break;
|
||||
default:
|
||||
build_cmd_connect:
|
||||
cmd_connect = netdev_build_cmd_connect(netdev, hs, prev_bssid);
|
||||
|
||||
if (!is_offload(hs) && (is_rsn || hs->settings_8021x)) {
|
||||
sm = eapol_sm_new(hs);
|
||||
|
||||
if (nhs->type == CONNECTION_TYPE_8021X_OFFLOAD)
|
||||
eapol_sm_set_require_handshake(sm, false);
|
||||
if (wiphy_get_rsnxe(netdev->wiphy,
|
||||
own_rsnxe, sizeof(own_rsnxe))) {
|
||||
set_bit(own_rsnxe + 2, IE_RSNX_SAE_H2E);
|
||||
handshake_state_set_supplicant_rsnxe(hs,
|
||||
own_rsnxe);
|
||||
}
|
||||
}
|
||||
|
||||
if (nhs->type == CONNECTION_TYPE_SOFTMAC)
|
||||
goto done;
|
||||
|
||||
build_cmd_connect:
|
||||
cmd_connect = netdev_build_cmd_connect(netdev, hs, prev_bssid);
|
||||
|
||||
if (!is_offload(hs) && (is_rsn || hs->settings_8021x)) {
|
||||
sm = eapol_sm_new(hs);
|
||||
|
||||
if (nhs->type == CONNECTION_TYPE_8021X_OFFLOAD)
|
||||
eapol_sm_set_require_handshake(sm, false);
|
||||
}
|
||||
done:
|
||||
netdev->connect_cmd = cmd_connect;
|
||||
netdev->event_filter = event_filter;
|
||||
@ -4483,6 +4570,52 @@ static void netdev_qos_map_frame_event(const struct mmpdu_header *hdr,
|
||||
netdev_send_qos_map_set(netdev, body + 4, body_len - 4);
|
||||
}
|
||||
|
||||
static void netdev_sae_external_auth_frame_event(const struct mmpdu_header *hdr,
|
||||
const void *body, size_t body_len,
|
||||
int rssi, void *user_data)
|
||||
{
|
||||
struct netdev *netdev = user_data;
|
||||
const struct mmpdu_authentication *auth;
|
||||
uint16_t status_code = MMPDU_STATUS_CODE_UNSPECIFIED;
|
||||
int ret;
|
||||
|
||||
if (!netdev->external_auth)
|
||||
return;
|
||||
|
||||
if (!netdev->ap)
|
||||
return;
|
||||
|
||||
auth = mmpdu_body(hdr);
|
||||
/*
|
||||
* Allows station to persist settings so it does not retry
|
||||
* the higher order ECC group again
|
||||
*/
|
||||
if (L_CPU_TO_LE16(auth->status) ==
|
||||
MMPDU_STATUS_CODE_UNSUPP_FINITE_CYCLIC_GROUP &&
|
||||
netdev->event_filter)
|
||||
netdev->event_filter(netdev, NETDEV_EVENT_ECC_GROUP_RETRY,
|
||||
NULL, netdev->user_data);
|
||||
|
||||
ret = auth_proto_rx_authenticate(netdev->ap, (const void *) hdr,
|
||||
mmpdu_header_len(hdr) + body_len);
|
||||
|
||||
switch (ret) {
|
||||
case 0:
|
||||
case -EAGAIN:
|
||||
return;
|
||||
case -ENOMSG:
|
||||
case -EBADMSG:
|
||||
return;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
if (ret > 0)
|
||||
status_code = (uint16_t)ret;
|
||||
|
||||
netdev_send_external_auth(netdev, status_code);
|
||||
}
|
||||
|
||||
static void netdev_preauth_cb(const uint8_t *pmk, void *user_data)
|
||||
{
|
||||
struct netdev_preauth_state *preauth = user_data;
|
||||
@ -5307,6 +5440,63 @@ static void netdev_control_port_frame_event(struct l_genl_msg *msg,
|
||||
frame, frame_len, unencrypted);
|
||||
}
|
||||
|
||||
static void netdev_external_auth_event(struct l_genl_msg *msg,
|
||||
struct netdev *netdev)
|
||||
{
|
||||
const uint8_t *bssid;
|
||||
struct iovec ssid;
|
||||
uint32_t akm;
|
||||
uint32_t action;
|
||||
struct handshake_state *hs = netdev->handshake;
|
||||
|
||||
if (L_WARN_ON(nl80211_parse_attrs(msg, NL80211_ATTR_AKM_SUITES, &akm,
|
||||
NL80211_ATTR_EXTERNAL_AUTH_ACTION, &action,
|
||||
NL80211_ATTR_BSSID, &bssid,
|
||||
NL80211_ATTR_SSID, &ssid,
|
||||
NL80211_ATTR_UNSPEC) < 0))
|
||||
return;
|
||||
|
||||
if (!L_IN_SET(action, NL80211_EXTERNAL_AUTH_START,
|
||||
NL80211_EXTERNAL_AUTH_ABORT))
|
||||
return;
|
||||
|
||||
/* kernel sends SAE_SHA256 AKM in BE order for legacy reasons */
|
||||
if (!L_IN_SET(akm, CRYPTO_AKM_SAE_SHA256, CRYPTO_AKM_FT_OVER_SAE_SHA256,
|
||||
L_CPU_TO_BE32(CRYPTO_AKM_SAE_SHA256))) {
|
||||
l_warn("Unknown AKM: %08x", akm);
|
||||
return;
|
||||
}
|
||||
|
||||
if (action == NL80211_EXTERNAL_AUTH_ABORT) {
|
||||
iwd_notice(IWD_NOTICE_CONNECT_INFO, "External Auth Aborted");
|
||||
goto error;
|
||||
}
|
||||
|
||||
iwd_notice(IWD_NOTICE_CONNECT_INFO,
|
||||
"External Auth to SSID: %s, bssid: "MAC,
|
||||
util_ssid_to_utf8(ssid.iov_len, ssid.iov_base),
|
||||
MAC_STR(bssid));
|
||||
|
||||
if (hs->ssid_len != ssid.iov_len ||
|
||||
memcmp(hs->ssid, ssid.iov_base, hs->ssid_len)) {
|
||||
iwd_notice(IWD_NOTICE_CONNECT_INFO, "Target SSID mismatch");
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (memcmp(hs->aa, bssid, ETH_ALEN)) {
|
||||
iwd_notice(IWD_NOTICE_CONNECT_INFO, "Target BSSID mismatch");
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (auth_proto_start(netdev->ap)) {
|
||||
netdev->external_auth = true;
|
||||
return;
|
||||
}
|
||||
|
||||
error:
|
||||
netdev_send_external_auth(netdev, MMPDU_STATUS_CODE_UNSPECIFIED);
|
||||
}
|
||||
|
||||
static void netdev_unicast_notify(struct l_genl_msg *msg, void *user_data)
|
||||
{
|
||||
struct netdev *netdev = NULL;
|
||||
@ -5344,6 +5534,9 @@ static void netdev_unicast_notify(struct l_genl_msg *msg, void *user_data)
|
||||
case NL80211_CMD_CONTROL_PORT_FRAME:
|
||||
netdev_control_port_frame_event(msg, netdev);
|
||||
break;
|
||||
case NL80211_CMD_EXTERNAL_AUTH:
|
||||
netdev_external_auth_event(msg, netdev);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
@ -5518,6 +5711,7 @@ static void netdev_add_station_frame_watches(struct netdev *netdev)
|
||||
static const uint8_t action_ft_response_prefix[] = { 0x06, 0x02 };
|
||||
static const uint8_t auth_ft_response_prefix[] = { 0x02, 0x00 };
|
||||
static const uint8_t action_qos_map_prefix[] = { 0x01, 0x04 };
|
||||
static const uint8_t auth_sae_prefix[] = { 0x03, 0x00 };
|
||||
uint64_t wdev = netdev->wdev_id;
|
||||
|
||||
/* Subscribe to Management -> Action -> RM -> Neighbor Report frames */
|
||||
@ -5545,6 +5739,13 @@ static void netdev_add_station_frame_watches(struct netdev *netdev)
|
||||
frame_watch_add(wdev, 0, 0x00d0, action_qos_map_prefix,
|
||||
sizeof(action_qos_map_prefix),
|
||||
netdev_qos_map_frame_event, netdev, NULL);
|
||||
|
||||
if (!wiphy_supports_cmds_auth_assoc(netdev->wiphy) &&
|
||||
wiphy_has_feature(netdev->wiphy, NL80211_FEATURE_SAE))
|
||||
frame_watch_add(wdev, 0, 0x00b0,
|
||||
auth_sae_prefix, sizeof(auth_sae_prefix),
|
||||
netdev_sae_external_auth_frame_event,
|
||||
netdev, NULL);
|
||||
}
|
||||
|
||||
static void netdev_setup_interface(struct netdev *netdev)
|
||||
|
||||
@ -648,7 +648,9 @@ struct l_genl_msg *nl80211_build_cmd_frame(uint32_t ifindex,
|
||||
msg = l_genl_msg_new_sized(NL80211_CMD_FRAME, 128 + 512);
|
||||
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &freq);
|
||||
|
||||
if (freq)
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &freq);
|
||||
l_genl_msg_append_attrv(msg, NL80211_ATTR_FRAME, iovs, iov_len + 1);
|
||||
|
||||
return msg;
|
||||
|
||||
19
src/wiphy.c
19
src/wiphy.c
@ -230,29 +230,22 @@ static bool wiphy_can_connect_sae(struct wiphy *wiphy)
|
||||
* cards the entire SAE protocol as well as the subsequent 4-way
|
||||
* handshake are all done in the driver/firmware (fullMAC).
|
||||
*
|
||||
* 3. TODO: Cards which allow SAE in userspace via CMD_EXTERNAL_AUTH.
|
||||
* 3. Cards which allow SAE in userspace via CMD_EXTERNAL_AUTH.
|
||||
* These cards do not support AUTH/ASSOC commands but do implement
|
||||
* CMD_EXTERNAL_AUTH which is supposed to allow userspace to
|
||||
* generate Authenticate frames as it would for case (1). As it
|
||||
* stands today only one driver actually uses CMD_EXTERNAL_AUTH and
|
||||
* for now IWD will not allow connections to SAE networks using this
|
||||
* mechanism.
|
||||
* generate Authenticate frames as it would for case (1).
|
||||
*/
|
||||
|
||||
if (wiphy_has_feature(wiphy, NL80211_FEATURE_SAE)) {
|
||||
/* Case (1) */
|
||||
if (wiphy->support_cmds_auth_assoc)
|
||||
return true;
|
||||
|
||||
/*
|
||||
* Case (3)
|
||||
*
|
||||
* TODO: No support for CMD_EXTERNAL_AUTH yet.
|
||||
*/
|
||||
l_warn("SAE unsupported: %s needs CMD_EXTERNAL_AUTH for SAE",
|
||||
/* Case 3 */
|
||||
iwd_notice(IWD_NOTICE_CONNECT_INFO,
|
||||
"FullMAC driver: %s using SAE. Expect EXTERNAL_AUTH",
|
||||
wiphy->driver_str);
|
||||
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
/* Case (2) */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user