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https://git.kernel.org/pub/scm/network/wireless/iwd.git
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adhoc: implement setting TX GTK
Adhoc requires 2 GTK's to be set, a single TX GTK and a per-mac RX GTK. The per-mac RX GTK already gets set via netdev_set_gtk. The single TX GTK is created the same as AP, where, upon the first station connecting a GTK is generated and set in the kernel. Then any subsequent stations use GET_KEY to retrieve the GTK and set it in the handshake.
This commit is contained in:
James Prestwood
Denis Kenzior
parent
2123d613fc
commit
70d6c9c692
182
src/adhoc.c
182
src/adhoc.c
@ -26,6 +26,8 @@
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#include <ell/ell.h>
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#include "linux/nl80211.h"
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#include "src/iwd.h"
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#include "src/device.h"
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#include "src/netdev.h"
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@ -38,6 +40,7 @@
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#include "src/mpdu.h"
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#include "src/adhoc.h"
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#include "src/dbus.h"
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#include "src/nl80211_util.h"
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struct adhoc_state {
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struct netdev *netdev;
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@ -47,8 +50,13 @@ struct adhoc_state {
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uint32_t sta_watch_id;
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uint32_t netdev_watch_id;
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struct l_dbus_message *pending;
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uint32_t ciphers;
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uint32_t group_cipher;
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uint8_t gtk[CRYPTO_MAX_GTK_LEN];
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uint8_t gtk_index;
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bool started : 1;
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bool open : 1;
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bool gtk_set : 1;
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};
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struct sta_state {
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@ -58,10 +66,12 @@ struct sta_state {
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struct handshake_state *hs_sta;
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struct eapol_sm *sm_a;
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struct handshake_state *hs_auth;
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uint32_t gtk_query_cmd_id;
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bool authenticated : 1;
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};
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static struct l_genl_family *nl80211 = NULL;
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static uint32_t netdev_watch;
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static void adhoc_sta_free(void *data)
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@ -71,6 +81,9 @@ static void adhoc_sta_free(void *data)
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if (sta->adhoc->open)
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goto end;
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if (sta->gtk_query_cmd_id)
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l_genl_family_cancel(nl80211, sta->gtk_query_cmd_id);
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if (sta->sm)
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eapol_sm_free(sta->sm);
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@ -94,6 +107,11 @@ static void adhoc_remove_sta(struct sta_state *sta)
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return;
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}
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if (sta->gtk_query_cmd_id) {
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l_genl_family_cancel(nl80211, sta->gtk_query_cmd_id);
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sta->gtk_query_cmd_id = 0;
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}
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/* signal station has been removed */
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if (sta->authenticated) {
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l_dbus_property_changed(dbus_get_bus(),
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@ -125,12 +143,10 @@ static void adhoc_reset(struct adhoc_state *adhoc)
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static void adhoc_set_rsn_info(struct adhoc_state *adhoc,
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struct ie_rsn_info *rsn)
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{
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struct wiphy *wiphy = netdev_get_wiphy(adhoc->netdev);
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memset(rsn, 0, sizeof(*rsn));
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rsn->akm_suites = IE_RSN_AKM_SUITE_PSK;
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rsn->pairwise_ciphers = wiphy_select_cipher(wiphy, 0xffff);
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rsn->group_cipher = IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC;
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rsn->pairwise_ciphers = adhoc->ciphers;
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rsn->group_cipher = adhoc->group_cipher;
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}
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static bool ap_sta_match_addr(const void *a, const void *b)
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@ -180,7 +196,8 @@ static void adhoc_handshake_event(struct handshake_state *hs,
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}
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}
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static struct eapol_sm *adhoc_new_sm(struct sta_state *sta, bool authenticator)
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static struct eapol_sm *adhoc_new_sm(struct sta_state *sta, bool authenticator,
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const uint8_t *gtk_rsc)
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{
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struct adhoc_state *adhoc = sta->adhoc;
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struct netdev *netdev = adhoc->netdev;
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@ -216,6 +233,10 @@ static struct eapol_sm *adhoc_new_sm(struct sta_state *sta, bool authenticator)
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handshake_state_set_supplicant_address(hs, own_addr);
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}
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if (gtk_rsc)
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handshake_state_set_gtk(hs, adhoc->gtk, adhoc->gtk_index,
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gtk_rsc);
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sm = eapol_sm_new(hs);
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if (!sm) {
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l_error("could not create sm object");
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@ -239,9 +260,65 @@ static void adhoc_free(struct adhoc_state *adhoc)
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l_free(adhoc);
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}
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static void adhoc_start_rsna(struct sta_state *sta, const uint8_t *gtk_rsc)
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{
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sta->sm_a = adhoc_new_sm(sta, true, gtk_rsc);
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if (!sta->sm_a) {
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l_error("could not create authenticator state machine");
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goto failed;
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}
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sta->sm = adhoc_new_sm(sta, false, NULL);
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if (!sta->sm) {
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l_error("could not create station state machine");
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goto failed;
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}
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eapol_register(sta->sm);
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eapol_register(sta->sm_a);
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eapol_start(sta->sm);
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return;
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failed:
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adhoc_remove_sta(sta);
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}
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static void adhoc_gtk_op_cb(struct l_genl_msg *msg, void *user_data)
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{
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if (l_genl_msg_get_error(msg) < 0) {
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uint8_t cmd = l_genl_msg_get_command(msg);
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const char *cmd_name =
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cmd == NL80211_CMD_NEW_KEY ? "NEW_KEY" : "SET_KEY";
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l_error("%s failed for the GTK: %i",
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cmd_name, l_genl_msg_get_error(msg));
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}
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}
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static void adhoc_gtk_query_cb(struct l_genl_msg *msg, void *user_data)
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{
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struct sta_state *sta = user_data;
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const void *gtk_rsc;
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sta->gtk_query_cmd_id = 0;
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gtk_rsc = nl80211_parse_get_key_seq(msg);
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if (!gtk_rsc)
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goto error;
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adhoc_start_rsna(sta, gtk_rsc);
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return;
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error:
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adhoc_remove_sta(sta);
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}
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static void adhoc_new_station(struct adhoc_state *adhoc, const uint8_t *mac)
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{
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struct sta_state *sta;
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struct l_genl_msg *msg;
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sta = l_queue_find(adhoc->sta_states, ap_sta_match_addr, mac);
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if (sta) {
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@ -249,6 +326,54 @@ static void adhoc_new_station(struct adhoc_state *adhoc, const uint8_t *mac)
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return;
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}
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/*
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* Follows same logic as AP. If this is the first station we create and
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* set a group key. Any subsequent connections will use GET_KEY for this
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* tx GTK.
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*/
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if (adhoc->group_cipher != IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC &&
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!adhoc->gtk_set && !adhoc->open) {
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enum crypto_cipher group_cipher =
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ie_rsn_cipher_suite_to_cipher(adhoc->group_cipher);
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int gtk_len = crypto_cipher_key_len(group_cipher);
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/*
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* Generate our GTK. Not following the example derivation
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* method in 802.11-2016 section 12.7.1.4 because a simple
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* l_getrandom is just as good.
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*/
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l_getrandom(adhoc->gtk, gtk_len);
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adhoc->gtk_index = 1;
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msg = nl80211_build_new_key_group(
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netdev_get_ifindex(adhoc->netdev),
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group_cipher, adhoc->gtk_index,
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adhoc->gtk, gtk_len, NULL,
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0, NULL);
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if (!l_genl_family_send(nl80211, msg, adhoc_gtk_op_cb, NULL,
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NULL)) {
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l_genl_msg_unref(msg);
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l_error("Issuing NEW_KEY failed");
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return;
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}
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msg = nl80211_build_set_key(netdev_get_ifindex(adhoc->netdev),
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adhoc->gtk_index);
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if (!l_genl_family_send(nl80211, msg, adhoc_gtk_op_cb, NULL,
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NULL)) {
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l_genl_msg_unref(msg);
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l_error("Issuing SET_KEY failed");
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return;
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}
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/*
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* Set the flag now because any new associating STA will
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* just use NL80211_CMD_GET_KEY from now.
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*/
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adhoc->gtk_set = true;
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}
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sta = l_new(struct sta_state, 1);
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memset(sta, 0, sizeof(struct sta_state));
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@ -269,27 +394,22 @@ static void adhoc_new_station(struct adhoc_state *adhoc, const uint8_t *mac)
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return;
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}
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sta->sm_a = adhoc_new_sm(sta, true);
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if (!sta->sm_a) {
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l_error("could not create authenticator state machine");
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goto failed;
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if (adhoc->group_cipher == IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC)
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adhoc_start_rsna(sta, NULL);
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else {
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msg = nl80211_build_get_key(netdev_get_ifindex(adhoc->netdev),
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adhoc->gtk_index);
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sta->gtk_query_cmd_id = l_genl_family_send(nl80211, msg,
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adhoc_gtk_query_cb,
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sta, NULL);
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if (!sta->gtk_query_cmd_id) {
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l_genl_msg_unref(msg);
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l_error("Issuing GET_KEY failed");
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adhoc_remove_sta(sta);
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return;
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}
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}
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sta->sm = adhoc_new_sm(sta, false);
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if (!sta->sm) {
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l_error("could not create station state machine");
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goto failed;
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}
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eapol_register(sta->sm);
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eapol_register(sta->sm_a);
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eapol_start(sta->sm);
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return;
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failed:
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adhoc_remove_sta(sta);
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}
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static void adhoc_del_station(struct adhoc_state *adhoc, const uint8_t *mac)
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@ -363,11 +483,10 @@ static struct l_dbus_message *adhoc_dbus_start(struct l_dbus *dbus,
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adhoc->ssid = l_strdup(ssid);
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adhoc->pending = l_dbus_message_ref(message);
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adhoc->sta_states = l_queue_new();
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adhoc->ciphers = wiphy_select_cipher(wiphy, 0xffff);
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adhoc->group_cipher = wiphy_select_cipher(wiphy, 0xffff);
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memset(&rsn, 0, sizeof(rsn));
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rsn.akm_suites = IE_RSN_AKM_SUITE_PSK;
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rsn.pairwise_ciphers = wiphy_select_cipher(wiphy, 0xffff);
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rsn.group_cipher = IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC;
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adhoc_set_rsn_info(adhoc, &rsn);
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ie_build_rsne(&rsn, ie_elems);
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rsn_ie.iov_base = ie_elems;
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@ -556,11 +675,14 @@ static void adhoc_netdev_watch(struct netdev *netdev,
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}
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}
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bool adhoc_init(void)
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bool adhoc_init(struct l_genl_family *nl)
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{
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netdev_watch = netdev_watch_add(adhoc_netdev_watch, NULL, NULL);
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l_dbus_register_interface(dbus_get_bus(), IWD_ADHOC_INTERFACE,
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adhoc_setup_interface, adhoc_destroy_interface, false);
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nl80211 = nl;
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return true;
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}
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@ -22,5 +22,5 @@
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struct device;
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bool adhoc_init(void);
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bool adhoc_init(struct l_genl_family *nl);
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void adhoc_exit(void);
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@ -159,6 +159,7 @@ static void nl80211_appeared(void *user_data)
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l_error("Unable to init scan functionality");
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ap_init(nl80211);
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adhoc_init(nl80211);
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}
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static void nl80211_vanished(void *user_data)
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@ -166,6 +167,7 @@ static void nl80211_vanished(void *user_data)
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l_debug("Lost nl80211 interface");
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ap_exit();
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adhoc_exit();
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scan_exit();
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wiphy_exit();
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}
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@ -477,7 +479,6 @@ int main(int argc, char *argv[])
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if (!device_init())
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goto fail_device;
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adhoc_init();
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station_init();
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wsc_init();
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network_init();
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@ -494,7 +495,6 @@ int main(int argc, char *argv[])
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network_exit();
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wsc_exit();
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station_exit();
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adhoc_exit();
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device_exit();
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fail_device:
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netdev_exit();
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