/* * * Wireless daemon for Linux * * Copyright (C) 2017-2019 Intel Corporation. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #include "linux/nl80211.h" #include "src/missing.h" #include "src/iwd.h" #include "src/module.h" #include "src/scan.h" #include "src/netdev.h" #include "src/wiphy.h" #include "src/crypto.h" #include "src/ie.h" #include "src/mpdu.h" #include "src/util.h" #include "src/eapol.h" #include "src/handshake.h" #include "src/dbus.h" #include "src/nl80211util.h" #include "src/frame-xchg.h" #include "src/wscutil.h" #include "src/eap-wsc.h" #include "src/ap.h" #include "src/storage.h" struct ap_state { struct netdev *netdev; struct l_genl_family *nl80211; const struct ap_ops *ops; ap_stopped_func_t stopped_func; void *user_data; struct ap_config *config; unsigned int ciphers; enum ie_rsn_cipher_suite group_cipher; uint32_t beacon_interval; struct l_uintset *rates; uint32_t start_stop_cmd_id; uint32_t mlme_watch; uint8_t gtk[CRYPTO_MAX_GTK_LEN]; uint8_t gtk_index; struct l_queue *wsc_pbc_probes; struct l_timeout *wsc_pbc_timeout; uint16_t wsc_dpid; uint8_t wsc_uuid_r[16]; uint16_t last_aid; struct l_queue *sta_states; struct l_dhcp_server *server; uint32_t rtnl_add_cmd; char *own_ip; unsigned int ip_prefix; bool started : 1; bool gtk_set : 1; bool cleanup_ip : 1; bool use_ip_pool : 1; }; struct sta_state { uint8_t addr[6]; bool associated; bool rsna; uint16_t aid; struct mmpdu_field_capability capability; uint16_t listen_interval; struct l_uintset *rates; uint32_t assoc_resp_cmd_id; struct ap_state *ap; uint8_t *assoc_rsne; struct eapol_sm *sm; struct handshake_state *hs; uint32_t gtk_query_cmd_id; struct l_idle *stop_handshake_work; struct l_settings *wsc_settings; uint8_t wsc_uuid_e[16]; bool wsc_v2; }; struct ap_wsc_pbc_probe_record { uint8_t mac[6]; uint8_t uuid_e[16]; uint64_t timestamp; }; struct ap_ip_pool { uint32_t start; uint32_t end; uint8_t prefix; /* Fist/last valid subnet */ uint8_t sub_start; uint8_t sub_end; struct l_uintset *used; }; struct ap_ip_pool pool; static uint32_t netdev_watch; struct l_netlink *rtnl; /* * Creates pool of IPs which AP intefaces can use. Each call to ip_pool_get * will advance the subnet +1 so there are no IP conflicts between AP * interfaces */ static bool ip_pool_create(const char *ip_prefix) { if (!util_ip_prefix_tohl(ip_prefix, &pool.prefix, &pool.start, &pool.end, NULL)) return false; if (pool.prefix > 24) { l_error("APRanges prefix must 24 or less (%u used)", pool.prefix); memset(&pool, 0, sizeof(pool)); return false; } /* * Find the number of subnets we can use, this will dictate the number * of AP interfaces that can be created (when using DHCP) */ pool.sub_start = (pool.start & 0x0000ff00) >> 8; pool.sub_end = (pool.end & 0x0000ff00) >> 8; pool.used = l_uintset_new_from_range(pool.sub_start, pool.sub_end); return true; } static char *ip_pool_get() { uint32_t ip; struct in_addr ia; uint8_t next_subnet = (uint8_t)l_uintset_find_unused_min(pool.used); /* This shouldn't happen */ if (next_subnet < pool.sub_start || next_subnet > pool.sub_end) return NULL; l_uintset_put(pool.used, next_subnet); ip = pool.start; ip &= 0xffff00ff; ip |= (next_subnet << 8); ia.s_addr = htonl(ip); return l_strdup(inet_ntoa(ia)); } static bool ip_pool_put(const char *address) { struct in_addr ia; uint32_t ip; uint8_t subnet; if (inet_aton(address, &ia) < 0) return false; ip = ntohl(ia.s_addr); subnet = (ip & 0x0000ff00) >> 8; if (subnet < pool.sub_start || subnet > pool.sub_end) return false; return l_uintset_take(pool.used, subnet); } static void ip_pool_destroy() { if (pool.used) l_uintset_free(pool.used); memset(&pool, 0, sizeof(pool)); } static const char *broadcast_from_ip(const char *ip) { struct in_addr ia; uint32_t bcast; if (inet_aton(ip, &ia) < 0) return NULL; bcast = ntohl(ia.s_addr); bcast &= 0xffffff00; bcast |= 0x000000ff; ia.s_addr = htonl(bcast); return inet_ntoa(ia); } void ap_config_free(struct ap_config *config) { if (unlikely(!config)) return; l_free(config->ssid); explicit_bzero(config->passphrase, sizeof(config->passphrase)); explicit_bzero(config->psk, sizeof(config->psk)); l_free(config->authorized_macs); l_free(config->wsc_name); if (config->profile) l_free(config->profile); l_free(config); } static void ap_stop_handshake(struct sta_state *sta) { if (sta->sm) { eapol_sm_free(sta->sm); sta->sm = NULL; } if (sta->hs) { handshake_state_free(sta->hs); sta->hs = NULL; } if (sta->wsc_settings) { l_settings_free(sta->wsc_settings); sta->wsc_settings = NULL; } if (sta->stop_handshake_work) { l_idle_remove(sta->stop_handshake_work); sta->stop_handshake_work = NULL; } } static void ap_stop_handshake_work(struct l_idle *idle, void *user_data) { struct sta_state *sta = user_data; ap_stop_handshake(sta); } static void ap_sta_free(void *data) { struct sta_state *sta = data; struct ap_state *ap = sta->ap; l_uintset_free(sta->rates); l_free(sta->assoc_rsne); if (sta->assoc_resp_cmd_id) l_genl_family_cancel(ap->nl80211, sta->assoc_resp_cmd_id); if (sta->gtk_query_cmd_id) l_genl_family_cancel(ap->nl80211, sta->gtk_query_cmd_id); ap_stop_handshake(sta); l_free(sta); } static void ap_reset(struct ap_state *ap) { struct netdev *netdev = ap->netdev; if (ap->mlme_watch) l_genl_family_unregister(ap->nl80211, ap->mlme_watch); frame_watch_wdev_remove(netdev_get_wdev_id(netdev)); if (ap->start_stop_cmd_id) l_genl_family_cancel(ap->nl80211, ap->start_stop_cmd_id); if (ap->rtnl_add_cmd) l_netlink_cancel(rtnl, ap->rtnl_add_cmd); l_queue_destroy(ap->sta_states, ap_sta_free); if (ap->rates) l_uintset_free(ap->rates); ap_config_free(ap->config); ap->config = NULL; l_queue_destroy(ap->wsc_pbc_probes, l_free); ap->started = false; /* Delete IP if one was set by IWD */ if (ap->cleanup_ip) l_rtnl_ifaddr4_delete(rtnl, netdev_get_ifindex(netdev), ap->ip_prefix, ap->own_ip, broadcast_from_ip(ap->own_ip), NULL, NULL, NULL); if (ap->own_ip) { /* Release IP from pool if used */ if (ap->use_ip_pool) ip_pool_put(ap->own_ip); l_free(ap->own_ip); } if (ap->server) l_dhcp_server_stop(ap->server); } static void ap_del_station(struct sta_state *sta, uint16_t reason, bool disassociate) { struct ap_state *ap = sta->ap; struct ap_event_station_removed_data event_data; bool send_event = false; netdev_del_station(ap->netdev, sta->addr, reason, disassociate); sta->associated = false; if (sta->rsna) { if (ap->ops->handle_event) { memset(&event_data, 0, sizeof(event_data)); event_data.mac = sta->addr; event_data.reason = reason; send_event = true; } sta->rsna = false; } if (sta->gtk_query_cmd_id) { l_genl_family_cancel(ap->nl80211, sta->gtk_query_cmd_id); sta->gtk_query_cmd_id = 0; } ap_stop_handshake(sta); if (send_event) ap->ops->handle_event(AP_EVENT_STATION_REMOVED, &event_data, ap->user_data); } static bool ap_sta_match_addr(const void *a, const void *b) { const struct sta_state *sta = a; return !memcmp(sta->addr, b, 6); } static void ap_remove_sta(struct sta_state *sta) { if (!l_queue_remove(sta->ap->sta_states, sta)) { l_error("tried to remove station that doesn't exist"); return; } ap_sta_free(sta); } static void ap_set_sta_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) l_error("SET_STATION failed: %i", l_genl_msg_get_error(msg)); } static void ap_del_key_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) l_debug("DEL_KEY failed: %i", l_genl_msg_get_error(msg)); } static void ap_new_rsna(struct sta_state *sta) { struct ap_state *ap = sta->ap; l_debug("STA "MAC" authenticated", MAC_STR(sta->addr)); sta->rsna = true; if (ap->ops->handle_event) { struct ap_event_station_added_data event_data = {}; event_data.mac = sta->addr; event_data.rsn_ie = sta->assoc_rsne; ap->ops->handle_event(AP_EVENT_STATION_ADDED, &event_data, ap->user_data); } } static void ap_drop_rsna(struct sta_state *sta) { struct ap_state *ap = sta->ap; struct l_genl_msg *msg; uint32_t ifindex = netdev_get_ifindex(sta->ap->netdev); uint8_t key_id = 0; sta->rsna = false; msg = nl80211_build_set_station_unauthorized(ifindex, sta->addr); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_AID, 2, &sta->aid); if (!l_genl_family_send(ap->nl80211, msg, ap_set_sta_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing SET_STATION failed"); } msg = l_genl_msg_new_sized(NL80211_CMD_DEL_KEY, 64); l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_IDX, 1, &key_id); l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta->addr); if (!l_genl_family_send(ap->nl80211, msg, ap_del_key_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing DEL_KEY failed"); } ap_stop_handshake(sta); if (ap->ops->handle_event) { struct ap_event_station_removed_data event_data = {}; event_data.mac = sta->addr; ap->ops->handle_event(AP_EVENT_STATION_REMOVED, &event_data, ap->user_data); } } static void ap_set_rsn_info(struct ap_state *ap, struct ie_rsn_info *rsn) { memset(rsn, 0, sizeof(*rsn)); rsn->akm_suites = IE_RSN_AKM_SUITE_PSK; rsn->pairwise_ciphers = ap->ciphers; rsn->group_cipher = ap->group_cipher; } /* * Build a Beacon frame or a Probe Response frame's header and body until * the TIM IE. Except for the optional TIM IE which is inserted by the * kernel when needed, our contents for both frames are the same. * See Beacon format in 8.3.3.2 and Probe Response format in 8.3.3.10. */ static size_t ap_build_beacon_pr_head(struct ap_state *ap, enum mpdu_management_subtype stype, const uint8_t *dest, uint8_t *out_buf, size_t out_len) { struct mmpdu_header *mpdu = (void *) out_buf; unsigned int len; uint16_t capability = IE_BSS_CAP_ESS | IE_BSS_CAP_PRIVACY; const uint8_t *bssid = netdev_get_address(ap->netdev); uint32_t minr, maxr, count, r; uint8_t *rates; struct ie_tlv_builder builder; memset(mpdu, 0, 36); /* Zero out header + non-IE fields */ /* Header */ mpdu->fc.protocol_version = 0; mpdu->fc.type = MPDU_TYPE_MANAGEMENT; mpdu->fc.subtype = stype; memcpy(mpdu->address_1, dest, 6); /* DA */ memcpy(mpdu->address_2, bssid, 6); /* SA */ memcpy(mpdu->address_3, bssid, 6); /* BSSID */ /* Body non-IE fields */ l_put_le16(ap->beacon_interval, out_buf + 32); /* Beacon Interval */ l_put_le16(capability, out_buf + 34); /* Capability Info */ ie_tlv_builder_init(&builder, out_buf + 36, out_len - 36); /* SSID IE */ ie_tlv_builder_next(&builder, IE_TYPE_SSID); ie_tlv_builder_set_data(&builder, ap->config->ssid, strlen(ap->config->ssid)); /* Supported Rates IE */ ie_tlv_builder_next(&builder, IE_TYPE_SUPPORTED_RATES); rates = ie_tlv_builder_get_data(&builder); minr = l_uintset_find_min(ap->rates); maxr = l_uintset_find_max(ap->rates); count = 0; for (r = minr; r <= maxr && count < 8; r++) if (l_uintset_contains(ap->rates, r)) { uint8_t flag = 0; /* Mark only the lowest rate as Basic Rate */ if (count == 0) flag = 0x80; *rates++ = r | flag; count++; } ie_tlv_builder_set_length(&builder, count); /* DSSS Parameter Set IE for DSSS, HR, ERP and HT PHY rates */ ie_tlv_builder_next(&builder, IE_TYPE_DSSS_PARAMETER_SET); ie_tlv_builder_set_data(&builder, &ap->config->channel, 1); ie_tlv_builder_finalize(&builder, &len); return 36 + len; } /* Beacon / Probe Response frame portion after the TIM IE */ static size_t ap_build_beacon_pr_tail(struct ap_state *ap, bool pr, uint8_t *out_buf) { size_t len; struct ie_rsn_info rsn; uint8_t *wsc_data; size_t wsc_data_size; uint8_t *wsc_ie; size_t wsc_ie_size; /* TODO: Country IE between TIM IE and RSNE */ /* RSNE */ ap_set_rsn_info(ap, &rsn); if (!ie_build_rsne(&rsn, out_buf)) return 0; len = 2 + out_buf[1]; /* WSC IE */ if (pr) { struct wsc_probe_response wsc_pr = {}; wsc_pr.version2 = true; wsc_pr.state = WSC_STATE_CONFIGURED; if (ap->wsc_pbc_timeout) { wsc_pr.selected_registrar = true; wsc_pr.device_password_id = ap->wsc_dpid; wsc_pr.selected_reg_config_methods = WSC_CONFIGURATION_METHOD_PUSH_BUTTON; } wsc_pr.response_type = WSC_RESPONSE_TYPE_AP; memcpy(wsc_pr.uuid_e, ap->wsc_uuid_r, sizeof(wsc_pr.uuid_e)); wsc_pr.primary_device_type = ap->config->wsc_primary_device_type; if (ap->config->wsc_name) l_strlcpy(wsc_pr.device_name, ap->config->wsc_name, sizeof(wsc_pr.device_name)); wsc_pr.config_methods = WSC_CONFIGURATION_METHOD_PUSH_BUTTON; if (ap->config->authorized_macs_num) { size_t len; len = ap->config->authorized_macs_num * 6; if (len > sizeof(wsc_pr.authorized_macs)) len = sizeof(wsc_pr.authorized_macs); memcpy(wsc_pr.authorized_macs, ap->config->authorized_macs, len); } wsc_data = wsc_build_probe_response(&wsc_pr, &wsc_data_size); } else { struct wsc_beacon wsc_beacon = {}; wsc_beacon.version2 = true; wsc_beacon.state = WSC_STATE_CONFIGURED; if (ap->wsc_pbc_timeout) { wsc_beacon.selected_registrar = true; wsc_beacon.device_password_id = ap->wsc_dpid; wsc_beacon.selected_reg_config_methods = WSC_CONFIGURATION_METHOD_PUSH_BUTTON; } if (ap->config->authorized_macs_num) { size_t len; len = ap->config->authorized_macs_num * 6; if (len > sizeof(wsc_beacon.authorized_macs)) len = sizeof(wsc_beacon.authorized_macs); memcpy(wsc_beacon.authorized_macs, ap->config->authorized_macs, len); } wsc_data = wsc_build_beacon(&wsc_beacon, &wsc_data_size); } if (!wsc_data) return 0; wsc_ie = ie_tlv_encapsulate_wsc_payload(wsc_data, wsc_data_size, &wsc_ie_size); l_free(wsc_data); if (!wsc_ie) return 0; memcpy(out_buf + len, wsc_ie, wsc_ie_size); len += wsc_ie_size; l_free(wsc_ie); return len; } static void ap_set_beacon_cb(struct l_genl_msg *msg, void *user_data) { int error = l_genl_msg_get_error(msg); if (error < 0) l_error("SET_BEACON failed: %s (%i)", strerror(-error), -error); } static void ap_update_beacon(struct ap_state *ap) { struct l_genl_msg *cmd; uint8_t head[256], tail[256]; size_t head_len, tail_len; uint64_t wdev_id = netdev_get_wdev_id(ap->netdev); static const uint8_t bcast_addr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; head_len = ap_build_beacon_pr_head(ap, MPDU_MANAGEMENT_SUBTYPE_BEACON, bcast_addr, head, sizeof(head)); tail_len = ap_build_beacon_pr_tail(ap, false, tail); if (L_WARN_ON(!head_len || !tail_len)) return; cmd = l_genl_msg_new_sized(NL80211_CMD_SET_BEACON, 32 + head_len + tail_len); l_genl_msg_append_attr(cmd, NL80211_ATTR_WDEV, 8, &wdev_id); l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_HEAD, head_len, head); l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_TAIL, tail_len, tail); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE, 0, ""); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE_PROBE_RESP, 0, ""); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE_ASSOC_RESP, 0, ""); if (l_genl_family_send(ap->nl80211, cmd, ap_set_beacon_cb, NULL, NULL)) return; l_genl_msg_unref(cmd); l_error("Issuing SET_BEACON failed"); } static void ap_wsc_exit_pbc(struct ap_state *ap) { if (!ap->wsc_pbc_timeout) return; l_timeout_remove(ap->wsc_pbc_timeout); ap->wsc_dpid = 0; ap_update_beacon(ap); ap->ops->handle_event(AP_EVENT_PBC_MODE_EXIT, NULL, ap->user_data); } static uint32_t ap_send_mgmt_frame(struct ap_state *ap, const struct mmpdu_header *frame, size_t frame_len, frame_xchg_cb_t callback, void *user_data) { uint32_t ch_freq = scan_channel_to_freq(ap->config->channel, SCAN_BAND_2_4_GHZ); uint64_t wdev_id = netdev_get_wdev_id(ap->netdev); struct iovec iov[2]; iov[0].iov_base = (void *) frame; iov[0].iov_len = frame_len; iov[1].iov_base = NULL; return frame_xchg_start(wdev_id, iov, ch_freq, 0, 0, 0, 0, callback, user_data, NULL, NULL); } static void ap_start_handshake(struct sta_state *sta, bool use_eapol_start) { struct ap_state *ap = sta->ap; const uint8_t *own_addr = netdev_get_address(ap->netdev); struct ie_rsn_info rsn; uint8_t bss_rsne[24]; handshake_state_set_ssid(sta->hs, (void *) ap->config->ssid, strlen(ap->config->ssid)); handshake_state_set_authenticator_address(sta->hs, own_addr); handshake_state_set_supplicant_address(sta->hs, sta->addr); ap_set_rsn_info(ap, &rsn); /* * Note: This assumes the length that ap_set_rsn_info() requires. If * ap_set_rsn_info() changes then this will need to be updated. */ ie_build_rsne(&rsn, bss_rsne); handshake_state_set_authenticator_ie(sta->hs, bss_rsne); sta->sm = eapol_sm_new(sta->hs); if (!sta->sm) { ap_stop_handshake(sta); l_error("could not create sm object"); goto error; } eapol_sm_set_listen_interval(sta->sm, sta->listen_interval); eapol_sm_set_use_eapol_start(sta->sm, use_eapol_start); eapol_register(sta->sm); eapol_start(sta->sm); return; error: ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); } static void ap_handshake_event(struct handshake_state *hs, enum handshake_event event, void *user_data, ...) { struct sta_state *sta = user_data; va_list args; va_start(args, user_data); switch (event) { case HANDSHAKE_EVENT_COMPLETE: ap_new_rsna(sta); break; case HANDSHAKE_EVENT_FAILED: netdev_handshake_failed(hs, va_arg(args, int)); /* fall through */ case HANDSHAKE_EVENT_SETTING_KEYS_FAILED: sta->sm = NULL; ap_remove_sta(sta); default: break; } va_end(args); } static void ap_start_rsna(struct sta_state *sta, const uint8_t *gtk_rsc) { /* this handshake setup assumes PSK network */ sta->hs = netdev_handshake_state_new(sta->ap->netdev); handshake_state_set_authenticator(sta->hs, true); handshake_state_set_event_func(sta->hs, ap_handshake_event, sta); handshake_state_set_supplicant_ie(sta->hs, sta->assoc_rsne); handshake_state_set_pmk(sta->hs, sta->ap->config->psk, 32); if (gtk_rsc) handshake_state_set_gtk(sta->hs, sta->ap->gtk, sta->ap->gtk_index, gtk_rsc); ap_start_handshake(sta, false); } static void ap_gtk_query_cb(struct l_genl_msg *msg, void *user_data) { struct sta_state *sta = user_data; const void *gtk_rsc; sta->gtk_query_cmd_id = 0; gtk_rsc = nl80211_parse_get_key_seq(msg); if (!gtk_rsc) goto error; ap_start_rsna(sta, gtk_rsc); return; error: ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); } struct ap_pbc_record_expiry_data { uint64_t min_time; const uint8_t *mac; }; static bool ap_wsc_pbc_record_expire(void *data, void *user_data) { struct ap_wsc_pbc_probe_record *record = data; const struct ap_pbc_record_expiry_data *expiry_data = user_data; if (record->timestamp > expiry_data->min_time && memcmp(record->mac, expiry_data->mac, 6)) return false; l_free(record); return true; } static void ap_stop_handshake_schedule(struct sta_state *sta) { if (sta->stop_handshake_work) return; sta->stop_handshake_work = l_idle_create(ap_stop_handshake_work, sta, NULL); } static void ap_wsc_handshake_event(struct handshake_state *hs, enum handshake_event event, void *user_data, ...) { struct sta_state *sta = user_data; va_list args; struct ap_event_registration_success_data event_data; struct ap_pbc_record_expiry_data expiry_data; va_start(args, user_data); switch (event) { case HANDSHAKE_EVENT_FAILED: sta->sm = NULL; ap_stop_handshake_schedule(sta); /* * Some diagrams in WSC v2.0.5 indicate we should * automatically deauthenticate the Enrollee. The text * generally indicates the Enrollee may disassociate * meaning that we should neither deauthenticate nor * disassociate it automatically. Some places indicate * that the enrollee can send a new EAPoL-Start right away * on an unsuccessful registration, we don't implement * this for now. STA remains associated but not authorized * and basically has no other option than to re-associate * or disassociate/deauthenticate. */ break; case HANDSHAKE_EVENT_EAP_NOTIFY: if (va_arg(args, unsigned int) != EAP_WSC_EVENT_CREDENTIAL_SENT) break; /* * WSC v2.0.5 Section 11.3: * "If the Registrar successfully runs the PBC method to * completion with an Enrollee, that Enrollee's probe requests * are removed from the Monitor Time check the next time the * Registrar's PBC button is pressed." */ expiry_data.min_time = 0; expiry_data.mac = sta->addr; l_queue_foreach_remove(sta->ap->wsc_pbc_probes, ap_wsc_pbc_record_expire, &expiry_data); event_data.mac = sta->addr; sta->ap->ops->handle_event(AP_EVENT_REGISTRATION_SUCCESS, &event_data, sta->ap->user_data); break; default: break; } va_end(args); } static void ap_start_eap_wsc(struct sta_state *sta) { struct ap_state *ap = sta->ap; /* * WSC v2.0.5 Section 8.2: "The AP is allowed to send * EAP-Request/Identity to the station before EAPOL-Start is received * if a WSC IE is included in the (re)association request and the * WSC IE is version 2.0 or higher. */ bool wait_for_eapol_start = !sta->wsc_v2; sta->wsc_settings = l_settings_new(); l_settings_set_string(sta->wsc_settings, "Security", "EAP-Method", "WSC-R"); l_settings_set_string(sta->wsc_settings, "WSC", "EnrolleeMAC", util_address_to_string(sta->addr)); l_settings_set_bytes(sta->wsc_settings, "WSC", "UUID-R", ap->wsc_uuid_r, 16); l_settings_set_bytes(sta->wsc_settings, "WSC", "UUID-E", sta->wsc_uuid_e, 16); l_settings_set_uint(sta->wsc_settings, "WSC", "RFBand", WSC_RF_BAND_2_4_GHZ); l_settings_set_uint(sta->wsc_settings, "WSC", "ConfigurationMethods", WSC_CONFIGURATION_METHOD_PUSH_BUTTON); l_settings_set_string(sta->wsc_settings, "WSC", "WPA2-SSID", ap->config->ssid); if (ap->config->passphrase[0]) l_settings_set_string(sta->wsc_settings, "WSC", "WPA2-Passphrase", ap->config->passphrase); else l_settings_set_bytes(sta->wsc_settings, "WSC", "WPA2-PSK", ap->config->psk, 32); sta->hs = netdev_handshake_state_new(ap->netdev); handshake_state_set_authenticator(sta->hs, true); handshake_state_set_event_func(sta->hs, ap_wsc_handshake_event, sta); handshake_state_set_8021x_config(sta->hs, sta->wsc_settings); ap_start_handshake(sta, wait_for_eapol_start); } static struct l_genl_msg *ap_build_cmd_del_key(struct ap_state *ap) { uint32_t ifindex = netdev_get_ifindex(ap->netdev); struct l_genl_msg *msg; msg = l_genl_msg_new_sized(NL80211_CMD_DEL_KEY, 128); l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_enter_nested(msg, NL80211_ATTR_KEY); l_genl_msg_append_attr(msg, NL80211_KEY_IDX, 1, &ap->gtk_index); l_genl_msg_leave_nested(msg); return msg; } static struct l_genl_msg *ap_build_cmd_new_station(struct sta_state *sta) { struct l_genl_msg *msg; uint32_t ifindex = netdev_get_ifindex(sta->ap->netdev); /* * This should hopefully work both with and without * NL80211_FEATURE_FULL_AP_CLIENT_STATE. */ struct nl80211_sta_flag_update flags = { .mask = (1 << NL80211_STA_FLAG_AUTHENTICATED) | (1 << NL80211_STA_FLAG_ASSOCIATED) | (1 << NL80211_STA_FLAG_AUTHORIZED) | (1 << NL80211_STA_FLAG_MFP), .set = (1 << NL80211_STA_FLAG_AUTHENTICATED) | (1 << NL80211_STA_FLAG_ASSOCIATED), }; msg = l_genl_msg_new_sized(NL80211_CMD_NEW_STATION, 300); l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta->addr); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_FLAGS2, 8, &flags); return msg; } static void ap_gtk_op_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) { uint8_t cmd = l_genl_msg_get_command(msg); const char *cmd_name = cmd == NL80211_CMD_NEW_KEY ? "NEW_KEY" : cmd == NL80211_CMD_SET_KEY ? "SET_KEY" : "DEL_KEY"; l_error("%s failed for the GTK: %i", cmd_name, l_genl_msg_get_error(msg)); } } static void ap_associate_sta_cb(struct l_genl_msg *msg, void *user_data) { struct sta_state *sta = user_data; struct ap_state *ap = sta->ap; if (l_genl_msg_get_error(msg) < 0) { l_error("NEW_STATION/SET_STATION failed: %i", l_genl_msg_get_error(msg)); return; } /* * WSC v2.0.5 Section 8.2: * "Therefore if a WSC IE is present in the (re)association request, * the AP shall engage in EAP-WSC with the station and shall not * attempt any other security handshake." * * So no need for group traffic, skip the GTK setup below. */ if (!sta->assoc_rsne) { ap_start_eap_wsc(sta); return; } /* * Set up the group key. If this is our first STA then we have * to add the new GTK to the kernel. In theory we should be * able to supply our own RSC (e.g. generated randomly) and use it * immediately for our 4-Way Handshake without querying the kernel. * However NL80211_CMD_NEW_KEY only lets us set the receive RSC -- * the Rx PN for CCMP and the Rx IV for TKIP -- and the * transmit RSC always starts as all zeros. There's effectively * no way to set the Tx RSC or query the Rx RSC through nl80211. * So we query the Tx RSC in both scenarios just in case some * driver/hardware uses a different initial Tx RSC. * * Optimally we would get called back by the EAPoL state machine * only when building the step 3 of 4 message to query the RSC as * late as possible but that would complicate EAPoL. */ if (ap->group_cipher != IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC && !ap->gtk_set) { enum crypto_cipher group_cipher = ie_rsn_cipher_suite_to_cipher(ap->group_cipher); int gtk_len = crypto_cipher_key_len(group_cipher); /* * Generate our GTK. Not following the example derivation * method in 802.11-2016 section 12.7.1.4 because a simple * l_getrandom is just as good. */ l_getrandom(ap->gtk, gtk_len); ap->gtk_index = 1; msg = nl80211_build_new_key_group( netdev_get_ifindex(ap->netdev), group_cipher, ap->gtk_index, ap->gtk, gtk_len, NULL, 0, NULL); if (!l_genl_family_send(ap->nl80211, msg, ap_gtk_op_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing NEW_KEY failed"); goto error; } msg = nl80211_build_set_key(netdev_get_ifindex(ap->netdev), ap->gtk_index); if (!l_genl_family_send(ap->nl80211, msg, ap_gtk_op_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing SET_KEY failed"); goto error; } /* * Set the flag now because any new associating STA will * just use NL80211_CMD_GET_KEY from now. */ ap->gtk_set = true; } if (ap->group_cipher == IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC) ap_start_rsna(sta, NULL); else { msg = nl80211_build_get_key(netdev_get_ifindex(ap->netdev), ap->gtk_index); sta->gtk_query_cmd_id = l_genl_family_send(ap->nl80211, msg, ap_gtk_query_cb, sta, NULL); if (!sta->gtk_query_cmd_id) { l_genl_msg_unref(msg); l_error("Issuing GET_KEY failed"); goto error; } } return; error: ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); } static void ap_associate_sta(struct ap_state *ap, struct sta_state *sta) { struct l_genl_msg *msg; uint32_t ifindex = netdev_get_ifindex(ap->netdev); uint8_t rates[256]; uint32_t r, minr, maxr, count = 0; uint16_t capability = l_get_le16(&sta->capability); if (sta->associated) msg = nl80211_build_set_station_associated(ifindex, sta->addr); else msg = ap_build_cmd_new_station(sta); sta->associated = true; sta->rsna = false; minr = l_uintset_find_min(sta->rates); maxr = l_uintset_find_max(sta->rates); for (r = minr; r <= maxr; r++) if (l_uintset_contains(sta->rates, r)) rates[count++] = r; l_genl_msg_append_attr(msg, NL80211_ATTR_STA_AID, 2, &sta->aid); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_SUPPORTED_RATES, count, &rates); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_LISTEN_INTERVAL, 2, &sta->listen_interval); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_CAPABILITY, 2, &capability); if (!l_genl_family_send(ap->nl80211, msg, ap_associate_sta_cb, sta, NULL)) { l_genl_msg_unref(msg); if (l_genl_msg_get_command(msg) == NL80211_CMD_NEW_STATION) l_error("Issuing NEW_STATION failed"); else l_error("Issuing SET_STATION failed"); } } static bool ap_common_rates(struct l_uintset *ap_rates, struct l_uintset *sta_rates) { uint32_t minr = l_uintset_find_min(ap_rates); /* Our lowest rate is a Basic Rate so must be supported */ if (l_uintset_contains(sta_rates, minr)) return true; return false; } static void ap_success_assoc_resp_cb(int err, void *user_data) { struct sta_state *sta = user_data; struct ap_state *ap = sta->ap; sta->assoc_resp_cmd_id = 0; if (err) { if (err == -ECOMM) l_error("AP (Re)Association Response received no ACK"); else l_error("AP (Re)Association Response not sent %s (%i)", strerror(-err), -err); /* If we were in State 3 or 4 go to back to State 2 */ if (sta->associated) ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); return; } /* If we were in State 2, 3 or 4 also go to State 3 */ ap_associate_sta(ap, sta); l_info("AP (Re)Association Response ACK received"); } static void ap_fail_assoc_resp_cb(int err, void *user_data) { if (err == -ECOMM) l_error("AP (Re)Association Response with an error status " "received no ACK"); else if (err) l_error("AP (Re)Association Response with an error status " "not sent: %s (%i)", strerror(-err), -err); else l_info("AP (Re)Association Response with an error status " "delivered OK"); } static uint32_t ap_assoc_resp(struct ap_state *ap, struct sta_state *sta, const uint8_t *dest, enum mmpdu_reason_code status_code, bool reassoc, frame_xchg_cb_t callback) { const uint8_t *addr = netdev_get_address(ap->netdev); uint8_t mpdu_buf[128]; struct mmpdu_header *mpdu = (void *) mpdu_buf; struct mmpdu_association_response *resp; size_t ies_len = 0; uint16_t capability = IE_BSS_CAP_ESS | IE_BSS_CAP_PRIVACY; uint32_t r, minr, maxr, count; memset(mpdu, 0, sizeof(*mpdu)); /* Header */ mpdu->fc.protocol_version = 0; mpdu->fc.type = MPDU_TYPE_MANAGEMENT; mpdu->fc.subtype = reassoc ? MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_RESPONSE : MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_RESPONSE; memcpy(mpdu->address_1, dest, 6); /* DA */ memcpy(mpdu->address_2, addr, 6); /* SA */ memcpy(mpdu->address_3, addr, 6); /* BSSID */ /* Association Response body */ resp = (void *) mmpdu_body(mpdu); l_put_le16(capability, &resp->capability); resp->status_code = L_CPU_TO_LE16(status_code); resp->aid = sta ? L_CPU_TO_LE16(sta->aid | 0xc000) : 0; /* Supported Rates IE */ resp->ies[ies_len++] = IE_TYPE_SUPPORTED_RATES; minr = l_uintset_find_min(ap->rates); maxr = l_uintset_find_max(ap->rates); count = 0; for (r = minr; r <= maxr && count < 8; r++) if (l_uintset_contains(ap->rates, r)) { uint8_t flag = 0; /* Mark only the lowest rate as Basic Rate */ if (count == 0) flag = 0x80; resp->ies[ies_len + 1 + count++] = r | flag; } resp->ies[ies_len++] = count; ies_len += count; if (sta && !sta->assoc_rsne) { struct wsc_association_response wsc_resp = {}; uint8_t *wsc_data; size_t wsc_data_len; uint8_t *wsc_ie; size_t wsc_ie_len; wsc_resp.response_type = WSC_RESPONSE_TYPE_AP; wsc_resp.version2 = sta->wsc_v2; wsc_data = wsc_build_association_response(&wsc_resp, &wsc_data_len); if (!wsc_data) { l_error("wsc_build_beacon error"); goto send_frame; } wsc_ie = ie_tlv_encapsulate_wsc_payload(wsc_data, wsc_data_len, &wsc_ie_len); l_free(wsc_data); if (!wsc_ie) { l_error("ie_tlv_encapsulate_wsc_payload error"); goto send_frame; } memcpy(resp->ies + ies_len, wsc_ie, wsc_ie_len); ies_len += wsc_ie_len; l_free(wsc_ie); } send_frame: return ap_send_mgmt_frame(ap, mpdu, resp->ies + ies_len - mpdu_buf, callback, sta); } static int ap_parse_supported_rates(struct ie_tlv_iter *iter, struct l_uintset **set) { const uint8_t *rates; unsigned int len; unsigned int i; len = ie_tlv_iter_get_length(iter); if (ie_tlv_iter_get_tag(iter) == IE_TYPE_SUPPORTED_RATES && len == 0) return -EINVAL; rates = ie_tlv_iter_get_data(iter); if (!*set) *set = l_uintset_new(108); for (i = 0; i < len; i++) { if (rates[i] == 0xff) continue; l_uintset_put(*set, rates[i] & 0x7f); } return 0; } /* * This handles both the Association and Reassociation Request frames. * Association Request is documented in 802.11-2016 9.3.3.6 (frame format), * 802.11-2016 11.3.5.3 (MLME/SME) and Reassociation in 802.11-2016 * 9.3.3.8 (frame format), 802.11-2016 11.3.5.3 (MLME/SME). * * The difference between Association and Reassociation procedures is * documented in 11.3.5.1 "General" but seems inconsistent with specific * instructions in 11.3.5.3 vs. 11.3.5.5 and 11.3.5.2 vs. 11.3.5.4. * According to 11.3.5.1: * 1. Reassociation requires the STA to be already associated in the ESS, * Association doesn't. * 2. Unsuccessful Reassociation should not cause a state transition of * the authentication state between the two STAs. * * The first requirement is not present in 11.3.5.5 which is virtually * identical with 11.3.5.3, but we do implement it. Number 2 is also not * reflected in 11.3.5.5 where the state transitions are the same as in * 11.3.5.3 and 11.3.5.4 where the state transitions are the same as in * 11.3.5.2 including f) "If a Reassociation Response frame is received * with a status code other than SUCCESS [...] 1. [...] the state for * the AP [...] shall be set to State 2 [...]" * * For the record here are the apparent differences between 802.11-2016 * 11.3.5.2 and 11.3.5.4 ignoring the s/Associate/Reassociate/ changes * and the special case of Reassociation during a Fast Transition. * o Points c) and d) are switched around. * o On success, the STA is disassociated from all other APs in 11.3.5.2, * and from the previous AP in 11.3.5.4 c). (Shouldn't make a * difference as there seems to be no way for the STA to become * associated with more than one AP) * o After Association a 4-Way Handshake is always performed, after * Reassociation it is only performed if STA was in State 3 according * to 11.3.5.4 g). This is not reflected in 11.3.5.5 though. * Additionally 11.3.5.4 and 11.3.5.5 require the STA and AP * respectively to delete current PTKSA/GTKSA/IGTKSA at the beginning * of the procedure independent of the STA state so without a 4-Way * Handshake the two stations end up with no encryption keys. * * The main difference between 11.3.5.3 and 11.3.5.5 is presence of p). */ static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc, const struct mmpdu_field_capability *capability, uint16_t listen_interval, const uint8_t *ies, size_t ies_len) { struct ap_state *ap = sta->ap; const char *ssid = NULL; const uint8_t *rsn = NULL; size_t ssid_len = 0; struct l_uintset *rates = NULL; struct ie_rsn_info rsn_info; int err; struct ie_tlv_iter iter; uint8_t *wsc_data = NULL; ssize_t wsc_data_len; if (sta->assoc_resp_cmd_id) return; if (reassoc && !sta->associated) { err = MMPDU_REASON_CODE_CLASS3_FRAME_FROM_NONASSOC_STA; goto unsupported; } wsc_data = ie_tlv_extract_wsc_payload(ies, ies_len, &wsc_data_len); ie_tlv_iter_init(&iter, ies, ies_len); while (ie_tlv_iter_next(&iter)) switch (ie_tlv_iter_get_tag(&iter)) { case IE_TYPE_SSID: ssid = (const char *) ie_tlv_iter_get_data(&iter); ssid_len = ie_tlv_iter_get_length(&iter); break; case IE_TYPE_SUPPORTED_RATES: case IE_TYPE_EXTENDED_SUPPORTED_RATES: if (ap_parse_supported_rates(&iter, &rates) < 0) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } break; case IE_TYPE_RSN: /* * WSC v2.0.5 Section 8.2: * "Note that during the WSC association [...] the * RSN IE and the WPA IE are irrelevant and shall be * ignored by both the station and AP." */ if (wsc_data) break; if (ie_parse_rsne(&iter, &rsn_info) < 0) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } rsn = (const uint8_t *) ie_tlv_iter_get_data(&iter) - 2; break; } if (!rates || !ssid || (!wsc_data && !rsn) || ssid_len != strlen(ap->config->ssid) || memcmp(ssid, ap->config->ssid, ssid_len)) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } if (!ap_common_rates(ap->rates, rates)) { err = MMPDU_REASON_CODE_UNSPECIFIED; goto unsupported; } /* Is the client requesting RSNA establishment or WSC registration */ if (!rsn) { struct wsc_association_request wsc_req; struct ap_event_registration_start_data event_data; struct ap_wsc_pbc_probe_record *record; if (wsc_parse_association_request(wsc_data, wsc_data_len, &wsc_req) < 0) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } l_free(wsc_data); wsc_data = NULL; if (wsc_req.request_type != WSC_REQUEST_TYPE_ENROLLEE_OPEN_8021X) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } if (!ap->wsc_pbc_timeout) { l_debug("WSC association from %s but we're not in " "PBC mode", util_address_to_string(sta->addr)); err = MMPDU_REASON_CODE_UNSPECIFIED; goto bad_frame; } if (l_queue_isempty(ap->wsc_pbc_probes)) { l_debug("%s tried to register as enrollee but we " "don't have their Probe Request record", util_address_to_string(sta->addr)); err = MMPDU_REASON_CODE_UNSPECIFIED; goto bad_frame; } /* * For PBC, the Enrollee must have sent the only PBC Probe * Request within the monitor time and walk time. */ record = l_queue_peek_head(ap->wsc_pbc_probes); if (memcmp(sta->addr, record->mac, 6)) { l_debug("Session overlap during %s's attempt to " "register as WSC enrollee", util_address_to_string(sta->addr)); err = MMPDU_REASON_CODE_UNSPECIFIED; goto bad_frame; } memcpy(sta->wsc_uuid_e, record->uuid_e, 16); sta->wsc_v2 = wsc_req.version2; event_data.mac = sta->addr; ap->ops->handle_event(AP_EVENT_REGISTRATION_START, &event_data, ap->user_data); /* * Since we're starting the PBC Registration Protocol * we can now exit the "active PBC mode". */ ap_wsc_exit_pbc(ap); } else { if (rsn_info.mfpr && rsn_info.spp_a_msdu_required) { err = MMPDU_REASON_CODE_UNSPECIFIED; goto unsupported; } if (!(rsn_info.pairwise_ciphers & ap->ciphers)) { err = MMPDU_REASON_CODE_INVALID_PAIRWISE_CIPHER; goto unsupported; } if (rsn_info.akm_suites != IE_RSN_AKM_SUITE_PSK) { err = MMPDU_REASON_CODE_INVALID_AKMP; goto unsupported; } } /* 802.11-2016 11.3.5.3 j) */ if (sta->rsna) ap_drop_rsna(sta); else if (sta->associated) ap_stop_handshake(sta); if (!sta->associated) { /* * Everything fine so far, assign an AID, send response. * According to 802.11-2016 11.3.5.3 l) we will only go to * State 3 (set sta->associated) once we receive the station's * ACK or gave up on resends. */ sta->aid = ++ap->last_aid; } sta->capability = *capability; sta->listen_interval = listen_interval; if (sta->rates) l_uintset_free(sta->rates); sta->rates = rates; if (sta->assoc_rsne) l_free(sta->assoc_rsne); if (rsn) sta->assoc_rsne = l_memdup(rsn, rsn[1] + 2); else sta->assoc_rsne = NULL; sta->assoc_resp_cmd_id = ap_assoc_resp(ap, sta, sta->addr, 0, reassoc, ap_success_assoc_resp_cb); if (!sta->assoc_resp_cmd_id) l_error("Sending success (Re)Association Response failed"); return; unsupported: bad_frame: /* * TODO: MFP * * 802.11-2016 11.3.5.3 m) * "If the ResultCode in the MLME-ASSOCIATE.response primitive is * not SUCCESS and management frame protection is in use the state * for the STA shall be left unchanged. If the ResultCode is not * SUCCESS and management frame protection is not in use the state * for the STA shall be set to State 3 if it was State 4." * * For now, we need to drop the RSNA. */ if (sta->rsna) ap_drop_rsna(sta); else if (sta->associated) ap_stop_handshake(sta); if (rates) l_uintset_free(rates); l_free(wsc_data); if (!ap_assoc_resp(ap, sta, sta->addr, err, reassoc, ap_fail_assoc_resp_cb)) l_error("Sending error (Re)Association Response failed"); } /* 802.11-2016 9.3.3.6 */ static void ap_assoc_req_cb(const struct mmpdu_header *hdr, const void *body, size_t body_len, int rssi, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const uint8_t *from = hdr->address_2; const struct mmpdu_association_request *req = body; const uint8_t *bssid = netdev_get_address(ap->netdev); l_info("AP Association Request from %s", util_address_to_string(from)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_find(ap->sta_states, ap_sta_match_addr, from); if (!sta) { if (!ap_assoc_resp(ap, NULL, from, MMPDU_REASON_CODE_STA_REQ_ASSOC_WITHOUT_AUTH, false, ap_fail_assoc_resp_cb)) l_error("Sending error Association Response failed"); return; } ap_assoc_reassoc(sta, false, &req->capability, L_LE16_TO_CPU(req->listen_interval), req->ies, body_len - sizeof(*req)); } /* 802.11-2016 9.3.3.8 */ static void ap_reassoc_req_cb(const struct mmpdu_header *hdr, const void *body, size_t body_len, int rssi, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const uint8_t *from = hdr->address_2; const struct mmpdu_reassociation_request *req = body; const uint8_t *bssid = netdev_get_address(ap->netdev); int err; l_info("AP Reassociation Request from %s", util_address_to_string(from)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_find(ap->sta_states, ap_sta_match_addr, from); if (!sta) { err = MMPDU_REASON_CODE_STA_REQ_ASSOC_WITHOUT_AUTH; goto bad_frame; } if (memcmp(req->current_ap_address, bssid, 6)) { err = MMPDU_REASON_CODE_UNSPECIFIED; goto bad_frame; } ap_assoc_reassoc(sta, true, &req->capability, L_LE16_TO_CPU(req->listen_interval), req->ies, body_len - sizeof(*req)); return; bad_frame: if (!ap_assoc_resp(ap, NULL, from, err, true, ap_fail_assoc_resp_cb)) l_error("Sending error Reassociation Response failed"); } #define AP_WSC_PBC_MONITOR_TIME 120 #define AP_WSC_PBC_WALK_TIME 120 static void ap_process_wsc_probe_req(struct ap_state *ap, const uint8_t *from, const uint8_t *wsc_data, size_t wsc_data_len) { struct wsc_probe_request req; struct ap_pbc_record_expiry_data expiry_data; struct ap_wsc_pbc_probe_record *record; uint64_t now; bool empty; uint8_t first_sta_addr[6] = {}; const struct l_queue_entry *entry; if (wsc_parse_probe_request(wsc_data, wsc_data_len, &req) < 0) return; if (!(req.config_methods & WSC_CONFIGURATION_METHOD_PUSH_BUTTON)) return; if (req.device_password_id != WSC_DEVICE_PASSWORD_ID_PUSH_BUTTON) return; /* Save the address of the first enrollee record */ record = l_queue_peek_head(ap->wsc_pbc_probes); if (record) memcpy(first_sta_addr, record->mac, 6); now = l_time_now(); /* * Expire entries older than PBC Monitor Time. While there also drop * older entries from the same Enrollee that sent us this new Probe * Request. It's unclear whether we should also match by the UUID-E. */ expiry_data.min_time = now - AP_WSC_PBC_MONITOR_TIME * 1000000; expiry_data.mac = from; l_queue_foreach_remove(ap->wsc_pbc_probes, ap_wsc_pbc_record_expire, &expiry_data); empty = l_queue_isempty(ap->wsc_pbc_probes); if (!ap->wsc_pbc_probes) ap->wsc_pbc_probes = l_queue_new(); /* Add new record */ record = l_new(struct ap_wsc_pbc_probe_record, 1); memcpy(record->mac, from, 6); memcpy(record->uuid_e, req.uuid_e, sizeof(record->uuid_e)); record->timestamp = now; l_queue_push_tail(ap->wsc_pbc_probes, record); /* * If queue was non-empty and we've added one more record then we * now have seen more than one PBC enrollee during the PBC Monitor * Time and must exit "active PBC mode" due to "session overlap". * WSC v2.0.5 Section 11.3: * "Within the PBC Monitor Time, if the Registrar receives PBC * probe requests from more than one Enrollee [...] then the * Registrar SHALL signal a "session overlap" error. As a result, * the Registrar shall refuse to enter active PBC mode and shall * also refuse to perform a PBC-based Registration Protocol * exchange [...]" */ if (empty) return; if (ap->wsc_pbc_timeout) { l_debug("Exiting PBC mode due to Session Overlap"); ap_wsc_exit_pbc(ap); } /* * "If the Registrar is engaged in PBC Registration Protocol * exchange with an Enrollee and receives a Probe Request or M1 * Message from another Enrollee, then the Registrar should * signal a "session overlap" error". * * For simplicity just interrupt the handshake with that enrollee. */ for (entry = l_queue_get_entries(ap->sta_states); entry; entry = entry->next) { struct sta_state *sta = entry->data; if (!sta->associated || sta->assoc_rsne) continue; /* * Check whether this enrollee is in PBC Registration * Protocol by comparing its mac with the first (and only) * record we had in ap->wsc_pbc_probes. If we had more * than one record we wouldn't have been in * "active PBC mode". */ if (memcmp(sta->addr, first_sta_addr, 6) || !memcmp(sta->addr, from, 6)) continue; l_debug("Interrupting handshake with %s due to Session Overlap", util_address_to_string(sta->addr)); if (sta->hs) { netdev_handshake_failed(sta->hs, MMPDU_REASON_CODE_DISASSOC_AP_BUSY); sta->sm = NULL; } ap_remove_sta(sta); } } static void ap_probe_resp_cb(int err, void *user_data) { if (err == -ECOMM) l_error("AP Probe Response received no ACK"); else if (err) l_error("AP Probe Response not sent: %s (%i)", strerror(-err), -err); else l_info("AP Probe Response delivered OK"); } /* * Parse Probe Request according to 802.11-2016 9.3.3.10 and act according * to 802.11-2016 11.1.4.3 */ static void ap_probe_req_cb(const struct mmpdu_header *hdr, const void *body, size_t body_len, int rssi, void *user_data) { struct ap_state *ap = user_data; const struct mmpdu_probe_request *req = body; const char *ssid = NULL; const uint8_t *ssid_list = NULL; size_t ssid_len = 0, ssid_list_len = 0, len; uint8_t dsss_channel = 0; struct ie_tlv_iter iter; const uint8_t *bssid = netdev_get_address(ap->netdev); bool match = false; uint8_t resp[512]; uint8_t *wsc_data; ssize_t wsc_data_len; l_info("AP Probe Request from %s", util_address_to_string(hdr->address_2)); ie_tlv_iter_init(&iter, req->ies, body_len - sizeof(*req)); while (ie_tlv_iter_next(&iter)) switch (ie_tlv_iter_get_tag(&iter)) { case IE_TYPE_SSID: ssid = (const char *) ie_tlv_iter_get_data(&iter); ssid_len = ie_tlv_iter_get_length(&iter); break; case IE_TYPE_SSID_LIST: ssid_list = ie_tlv_iter_get_data(&iter); ssid_list_len = ie_tlv_iter_get_length(&iter); break; case IE_TYPE_DSSS_PARAMETER_SET: if (ie_tlv_iter_get_length(&iter) != 1) return; dsss_channel = ie_tlv_iter_get_data(&iter)[0]; break; } /* * Check if we should reply to this Probe Request according to * 802.11-2016 section 11.1.4.3.2. */ if (memcmp(hdr->address_1, bssid, 6) && !util_is_broadcast_address(hdr->address_1)) return; if (memcmp(hdr->address_3, bssid, 6) && !util_is_broadcast_address(hdr->address_3)) return; if (!ssid || ssid_len == 0) /* Wildcard SSID */ match = true; else if (ssid && ssid_len == strlen(ap->config->ssid) && /* One SSID */ !memcmp(ssid, ap->config->ssid, ssid_len)) match = true; else if (ssid && ssid_len == 7 && !memcmp(ssid, "DIRECT-", 7) && !memcmp(ssid, ap->config->ssid, 7)) /* P2P wildcard */ match = true; else if (ssid_list) { /* SSID List */ ie_tlv_iter_init(&iter, ssid_list, ssid_list_len); while (ie_tlv_iter_next(&iter)) { if (ie_tlv_iter_get_tag(&iter) != IE_TYPE_SSID) return; ssid = (const char *) ie_tlv_iter_get_data(&iter); ssid_len = ie_tlv_iter_get_length(&iter); if (ssid_len == strlen(ap->config->ssid) && !memcmp(ssid, ap->config->ssid, ssid_len)) { match = true; break; } } } if (dsss_channel != 0 && dsss_channel != ap->config->channel) match = false; if (!match) return; /* * Process the WSC IE first as it may cause us to exit "active PBC * mode" and that can be immediately reflected in our Probe Response. */ wsc_data = ie_tlv_extract_wsc_payload(req->ies, body_len - sizeof(*req), &wsc_data_len); if (wsc_data) { ap_process_wsc_probe_req(ap, hdr->address_2, wsc_data, wsc_data_len); l_free(wsc_data); } len = ap_build_beacon_pr_head(ap, MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE, hdr->address_2, resp, sizeof(resp)); len += ap_build_beacon_pr_tail(ap, true, resp + len); ap_send_mgmt_frame(ap, (struct mmpdu_header *) resp, len, ap_probe_resp_cb, NULL); } /* 802.11-2016 9.3.3.5 (frame format), 802.11-2016 11.3.5.9 (MLME/SME) */ static void ap_disassoc_cb(const struct mmpdu_header *hdr, const void *body, size_t body_len, int rssi, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const struct mmpdu_disassociation *disassoc = body; const uint8_t *bssid = netdev_get_address(ap->netdev); l_info("AP Disassociation from %s, reason %i", util_address_to_string(hdr->address_2), (int) L_LE16_TO_CPU(disassoc->reason_code)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_find(ap->sta_states, ap_sta_match_addr, hdr->address_2); if (sta && sta->assoc_resp_cmd_id) { l_genl_family_cancel(ap->nl80211, sta->assoc_resp_cmd_id); sta->assoc_resp_cmd_id = 0; } if (!sta || !sta->associated) return; ap_del_station(sta, L_LE16_TO_CPU(disassoc->reason_code), true); } static void ap_auth_reply_cb(int err, void *user_data) { if (err == -ECOMM) l_error("AP Authentication frame 2 received no ACK"); else if (err) l_error("AP Authentication frame 2 not sent: %s (%i)", strerror(-err), -err); else l_info("AP Authentication frame 2 ACKed by STA"); } static void ap_auth_reply(struct ap_state *ap, const uint8_t *dest, enum mmpdu_reason_code status_code) { const uint8_t *addr = netdev_get_address(ap->netdev); uint8_t mpdu_buf[64]; struct mmpdu_header *mpdu = (struct mmpdu_header *) mpdu_buf; struct mmpdu_authentication *auth; memset(mpdu, 0, sizeof(*mpdu)); /* Header */ mpdu->fc.protocol_version = 0; mpdu->fc.type = MPDU_TYPE_MANAGEMENT; mpdu->fc.subtype = MPDU_MANAGEMENT_SUBTYPE_AUTHENTICATION; memcpy(mpdu->address_1, dest, 6); /* DA */ memcpy(mpdu->address_2, addr, 6); /* SA */ memcpy(mpdu->address_3, addr, 6); /* BSSID */ /* Authentication body */ auth = (void *) mmpdu_body(mpdu); auth->algorithm = L_CPU_TO_LE16(MMPDU_AUTH_ALGO_OPEN_SYSTEM); auth->transaction_sequence = L_CPU_TO_LE16(2); auth->status = L_CPU_TO_LE16(status_code); ap_send_mgmt_frame(ap, mpdu, (uint8_t *) auth + 6 - mpdu_buf, ap_auth_reply_cb, NULL); } /* * 802.11-2016 9.3.3.12 (frame format), 802.11-2016 11.3.4.3 and * 802.11-2016 12.3.3.2 (MLME/SME) */ static void ap_auth_cb(const struct mmpdu_header *hdr, const void *body, size_t body_len, int rssi, void *user_data) { struct ap_state *ap = user_data; const struct mmpdu_authentication *auth = body; const uint8_t *from = hdr->address_2; const uint8_t *bssid = netdev_get_address(ap->netdev); struct sta_state *sta; l_info("AP Authentication from %s", util_address_to_string(from)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; if (ap->config->authorized_macs_num) { unsigned int i; for (i = 0; i < ap->config->authorized_macs_num; i++) if (!memcmp(from, ap->config->authorized_macs + i * 6, 6)) break; if (i == ap->config->authorized_macs_num) { ap_auth_reply(ap, from, MMPDU_REASON_CODE_UNSPECIFIED); return; } } /* Only Open System authentication implemented here */ if (L_LE16_TO_CPU(auth->algorithm) != MMPDU_AUTH_ALGO_OPEN_SYSTEM) { ap_auth_reply(ap, from, MMPDU_REASON_CODE_UNSPECIFIED); return; } if (L_LE16_TO_CPU(auth->transaction_sequence) != 1) { ap_auth_reply(ap, from, MMPDU_REASON_CODE_UNSPECIFIED); return; } sta = l_queue_find(ap->sta_states, ap_sta_match_addr, from); /* * Figure 11-13 in 802.11-2016 11.3.2 shows a transition from * States 3 / 4 to State 2 on "Successful 802.11 Authentication" * however 11.3.4.2 and 11.3.4.3 clearly say the connection goes to * State 2 only if it was in State 1: * * "c) [...] the state for the indicated STA shall be set to State 2 * if it was State 1; the state shall remain unchanged if it was other * than State 1." */ if (sta) goto done; /* * Per 12.3.3.2.3 with Open System the state change is immediate, * no waiting for the response to be ACKed as with the association * frames. */ sta = l_new(struct sta_state, 1); memcpy(sta->addr, from, 6); sta->ap = ap; if (!ap->sta_states) ap->sta_states = l_queue_new(); l_queue_push_tail(ap->sta_states, sta); /* * Nothing to do here netlink-wise as we can't receive any data * frames until after association anyway. We do need to add a * timeout for the authentication and possibly the kernel could * handle that if we registered the STA with NEW_STATION now (TODO) */ done: ap_auth_reply(ap, from, 0); } /* 802.11-2016 9.3.3.13 (frame format), 802.11-2016 11.3.4.5 (MLME/SME) */ static void ap_deauth_cb(const struct mmpdu_header *hdr, const void *body, size_t body_len, int rssi, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const struct mmpdu_deauthentication *deauth = body; const uint8_t *bssid = netdev_get_address(ap->netdev); l_info("AP Deauthentication from %s, reason %i", util_address_to_string(hdr->address_2), (int) L_LE16_TO_CPU(deauth->reason_code)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_remove_if(ap->sta_states, ap_sta_match_addr, hdr->address_2); if (!sta) return; ap_del_station(sta, L_LE16_TO_CPU(deauth->reason_code), false); ap_sta_free(sta); } static void do_debug(const char *str, void *user_data) { const char *prefix = user_data; l_info("%s%s", prefix, str); } static void ap_start_failed(struct ap_state *ap) { ap->ops->handle_event(AP_EVENT_START_FAILED, NULL, ap->user_data); ap_reset(ap); l_genl_family_free(ap->nl80211); l_free(ap); } static void ap_start_cb(struct l_genl_msg *msg, void *user_data) { struct ap_state *ap = user_data; ap->start_stop_cmd_id = 0; if (l_genl_msg_get_error(msg) < 0) { l_error("START_AP failed: %i", l_genl_msg_get_error(msg)); goto failed; } /* * TODO: Add support for provisioning files where user could configure * specific DHCP sever settings. */ if (ap->server && !l_dhcp_server_start(ap->server)) { l_error("DHCP server failed to start"); goto failed; } ap->started = true; ap->ops->handle_event(AP_EVENT_STARTED, NULL, ap->user_data); return; failed: ap_start_failed(ap); } static struct l_genl_msg *ap_build_cmd_start_ap(struct ap_state *ap) { struct l_genl_msg *cmd; uint8_t head[256], tail[256]; size_t head_len, tail_len; uint32_t dtim_period = 3; uint32_t ifindex = netdev_get_ifindex(ap->netdev); struct wiphy *wiphy = netdev_get_wiphy(ap->netdev); uint32_t hidden_ssid = NL80211_HIDDEN_SSID_NOT_IN_USE; uint32_t nl_ciphers = ie_rsn_cipher_suite_to_cipher(ap->ciphers); uint32_t nl_akm = CRYPTO_AKM_PSK; uint32_t wpa_version = NL80211_WPA_VERSION_2; uint32_t auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM; uint32_t ch_freq = scan_channel_to_freq(ap->config->channel, SCAN_BAND_2_4_GHZ); uint32_t ch_width = NL80211_CHAN_WIDTH_20; static const uint8_t bcast_addr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; head_len = ap_build_beacon_pr_head(ap, MPDU_MANAGEMENT_SUBTYPE_BEACON, bcast_addr, head, sizeof(head)); tail_len = ap_build_beacon_pr_tail(ap, false, tail); if (!head_len || !tail_len) return NULL; cmd = l_genl_msg_new_sized(NL80211_CMD_START_AP, 256 + head_len + tail_len + strlen(ap->config->ssid)); /* SET_BEACON attrs */ l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_HEAD, head_len, head); l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_TAIL, tail_len, tail); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE, 0, ""); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE_PROBE_RESP, 0, ""); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE_ASSOC_RESP, 0, ""); /* START_AP attrs */ l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_INTERVAL, 4, &ap->beacon_interval); l_genl_msg_append_attr(cmd, NL80211_ATTR_DTIM_PERIOD, 4, &dtim_period); l_genl_msg_append_attr(cmd, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_append_attr(cmd, NL80211_ATTR_SSID, strlen(ap->config->ssid), ap->config->ssid); l_genl_msg_append_attr(cmd, NL80211_ATTR_HIDDEN_SSID, 4, &hidden_ssid); l_genl_msg_append_attr(cmd, NL80211_ATTR_CIPHER_SUITES_PAIRWISE, 4, &nl_ciphers); l_genl_msg_append_attr(cmd, NL80211_ATTR_WPA_VERSIONS, 4, &wpa_version); l_genl_msg_append_attr(cmd, NL80211_ATTR_AKM_SUITES, 4, &nl_akm); l_genl_msg_append_attr(cmd, NL80211_ATTR_AUTH_TYPE, 4, &auth_type); l_genl_msg_append_attr(cmd, NL80211_ATTR_WIPHY_FREQ, 4, &ch_freq); l_genl_msg_append_attr(cmd, NL80211_ATTR_CHANNEL_WIDTH, 4, &ch_width); if (wiphy_has_ext_feature(wiphy, NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211)) { l_genl_msg_append_attr(cmd, NL80211_ATTR_SOCKET_OWNER, 0, NULL); l_genl_msg_append_attr(cmd, NL80211_ATTR_CONTROL_PORT_OVER_NL80211, 0, NULL); } return cmd; } static void ap_ifaddr4_added_cb(int error, uint16_t type, const void *data, uint32_t len, void *user_data) { struct ap_state *ap = user_data; struct l_genl_msg *cmd; ap->rtnl_add_cmd = 0; if (error) { l_error("Failed to set IP address"); goto error; } cmd = ap_build_cmd_start_ap(ap); if (!cmd) goto error; ap->start_stop_cmd_id = l_genl_family_send(ap->nl80211, cmd, ap_start_cb, ap, NULL); if (!ap->start_stop_cmd_id) { l_genl_msg_unref(cmd); goto error; } return; error: ap_start_failed(ap); } static void ap_mlme_notify(struct l_genl_msg *msg, void *user_data) { struct ap_state *ap = user_data; uint32_t ifindex; if (nl80211_parse_attrs(msg, NL80211_ATTR_IFINDEX, &ifindex, NL80211_ATTR_UNSPEC) < 0 || ifindex != netdev_get_ifindex(ap->netdev)) return; switch (l_genl_msg_get_command(msg)) { case NL80211_CMD_STOP_AP: if (ap->start_stop_cmd_id) { l_genl_family_cancel(ap->nl80211, ap->start_stop_cmd_id); ap->start_stop_cmd_id = 0; ap->ops->handle_event(AP_EVENT_START_FAILED, NULL, ap->user_data); } else if (ap->started) { ap->started = false; ap->ops->handle_event(AP_EVENT_STOPPING, NULL, ap->user_data); } ap_reset(ap); l_genl_family_free(ap->nl80211); l_free(ap); break; } } static bool dhcp_load_settings(struct ap_state *ap, struct l_settings *settings) { struct l_dhcp_server *server = ap->server; struct in_addr ia; L_AUTO_FREE_VAR(char *, netmask) = l_settings_get_string(settings, "IPv4", "Netmask"); L_AUTO_FREE_VAR(char *, gateway) = l_settings_get_string(settings, "IPv4", "Gateway"); char **dns = l_settings_get_string_list(settings, "IPv4", "DNSList", ','); char **ip_range = l_settings_get_string_list(settings, "IPv4", "IPRange", ','); unsigned int lease_time; bool ret = false; if (!l_settings_get_uint(settings, "IPv4", "LeaseTime", &lease_time)) lease_time = 0; if (ip_range && l_strv_length(ip_range) != 2) goto parse_error; if (netmask && !l_dhcp_server_set_netmask(server, netmask)) goto parse_error; if (gateway && !l_dhcp_server_set_gateway(server, gateway)) goto parse_error; if (dns && !l_dhcp_server_set_dns(server, dns)) goto parse_error; if (ip_range && !l_dhcp_server_set_ip_range(server, ip_range[0], ip_range[1])) goto parse_error; if (lease_time && !l_dhcp_server_set_lease_time(server, lease_time)) goto parse_error; if (netmask && inet_pton(AF_INET, netmask, &ia) > 0) ap->ip_prefix = __builtin_popcountl(ia.s_addr); else ap->ip_prefix = 24; ret = true; parse_error: l_strv_free(dns); l_strv_free(ip_range); return ret; } /* * This will determine the IP being used for DHCP. The IP will be automatically * set to ap->own_ip. * * The address to set (or keep) is determined in this order: * 1. Address defined in provisioning file * 2. Address already set on interface * 3. Address in IP pool. * * Returns: 0 if an IP was successfully selected and needs to be set * -EALREADY if an IP was already set on the interface * -EEXIST if the IP pool ran out of IP's * -EINVAL if there was an error. */ static int ap_setup_dhcp(struct ap_state *ap, struct l_settings *settings) { uint32_t ifindex = netdev_get_ifindex(ap->netdev); struct in_addr ia; uint32_t address = 0; int ret = -EINVAL; ap->server = l_dhcp_server_new(ifindex); if (!ap->server) { l_error("Failed to create DHCP server on %u", ifindex); return -EINVAL;; } if (getenv("IWD_DHCP_DEBUG")) l_dhcp_server_set_debug(ap->server, do_debug, "[DHCPv4 SERV] ", NULL); /* get the current address if there is one */ if (l_net_get_address(ifindex, &ia) && ia.s_addr != 0) address = ia.s_addr; if (ap->config->profile) { char *addr; addr = l_settings_get_string(settings, "IPv4", "Address"); if (addr) { if (inet_pton(AF_INET, addr, &ia) < 0) goto free_addr; /* Is a matching address already set on interface? */ if (ia.s_addr == address) ret = -EALREADY; else ret = 0; } else if (address) { /* No address in config, but interface has one set */ addr = l_strdup(inet_ntoa(ia)); ret = -EALREADY; } else goto free_addr; /* Set the remaining DHCP options in config file */ if (!dhcp_load_settings(ap, settings)) { ret = -EINVAL; goto free_addr; } if (!l_dhcp_server_set_ip_address(ap->server, addr)) { ret = -EINVAL; goto free_addr; } ap->own_ip = l_strdup(addr); free_addr: l_free(addr); return ret; } else if (address) { /* No config file and address is already set */ ap->own_ip = l_strdup(inet_ntoa(ia)); return -EALREADY; } else if (pool.used) { /* No config file, no address set. Use IP pool */ ap->own_ip = ip_pool_get(); if (!ap->own_ip) { l_error("No more IP's in pool, cannot start AP on %u", ifindex); return -EEXIST; } ap->use_ip_pool = true; ap->ip_prefix = pool.prefix; return 0; } return -EINVAL; } static int ap_load_profile_and_dhcp(struct ap_state *ap, bool *wait_dhcp) { uint32_t ifindex = netdev_get_ifindex(ap->netdev); char *passphrase; L_AUTO_FREE_VAR(struct l_settings *, settings) = NULL; int err; /* No profile or DHCP settings */ if (!ap->config->profile && !pool.used) return 0; if (ap->config->profile) { settings = l_settings_new(); if (!l_settings_load_from_file(settings, ap->config->profile)) return -EINVAL; passphrase = l_settings_get_string(settings, "Security", "Passphrase"); if (passphrase) { if (strlen(passphrase) > 63) { l_error("[Security].Passphrase must not exceed " "63 characters"); return -EINVAL; } strcpy(ap->config->passphrase, passphrase); l_free(passphrase); } if (!l_settings_has_group(settings, "IPv4")) { *wait_dhcp = false; return 0; } } err = ap_setup_dhcp(ap, settings); if (err == 0) { /* Address change required */ ap->rtnl_add_cmd = l_rtnl_ifaddr4_add(rtnl, ifindex, ap->ip_prefix, ap->own_ip, broadcast_from_ip(ap->own_ip), ap_ifaddr4_added_cb, ap, NULL); if (!ap->rtnl_add_cmd) { l_error("Failed to add IPv4 address"); return false; } ap->cleanup_ip = true; *wait_dhcp = true; return 0; /* Selected address already set, continue normally */ } else if (err == -EALREADY) { *wait_dhcp = false; return 0; } return err; } /* * Start a simple independent WPA2 AP on given netdev. * * @ops.handle_event is required and must react to AP_EVENT_START_FAILED * and AP_EVENT_STOPPING by forgetting the ap_state struct, which is * going to be freed automatically. * In the @config struct the .ssid field is required and one of * .passphrase and .psk must be filled in. All other fields are optional. * If @ap_start succeeds, the returned ap_state takes ownership of * @config and the caller shouldn't free it or any of the memory pointed * to by its members (which also can't be static). */ struct ap_state *ap_start(struct netdev *netdev, struct ap_config *config, const struct ap_ops *ops, int *err_out, void *user_data) { struct ap_state *ap; struct wiphy *wiphy = netdev_get_wiphy(netdev); struct l_genl_msg *cmd; uint64_t wdev_id = netdev_get_wdev_id(netdev); int err = -EINVAL; bool wait_on_address = false; if (err_out) *err_out = err; if (L_WARN_ON(!config->ssid)) return NULL; if (L_WARN_ON(!config->profile && !config->passphrase[0] && util_mem_is_zero(config->psk, sizeof(config->psk)))) return NULL; ap = l_new(struct ap_state, 1); ap->nl80211 = l_genl_family_new(iwd_get_genl(), NL80211_GENL_NAME); ap->config = config; ap->netdev = netdev; ap->ops = ops; ap->user_data = user_data; /* * This both loads a profile if required and loads DHCP settings either * by the profile itself or the IP pool (or does nothing in the case * of a profile-less configuration). wait_on_address will be set true * if an address change is required. */ err = ap_load_profile_and_dhcp(ap, &wait_on_address); if (err < 0) goto error; if (!config->channel) /* TODO: Start a Get Survey to decide the channel */ config->channel = 6; if (!config->wsc_name) config->wsc_name = l_strdup(config->ssid); if (!config->wsc_primary_device_type.category) { /* Make ourselves a WFA standard PC by default */ config->wsc_primary_device_type.category = 1; memcpy(config->wsc_primary_device_type.oui, wsc_wfa_oui, 3); config->wsc_primary_device_type.oui_type = 0x04; config->wsc_primary_device_type.subcategory = 1; } /* TODO: Add all ciphers supported by wiphy */ ap->ciphers = wiphy_select_cipher(wiphy, 0xffff); ap->group_cipher = wiphy_select_cipher(wiphy, 0xffff); ap->beacon_interval = 100; ap->rates = l_uintset_new(200); /* TODO: Pick from actual supported rates */ if (config->no_cck_rates) { l_uintset_put(ap->rates, 12); /* 6 Mbps*/ l_uintset_put(ap->rates, 18); /* 9 Mbps*/ l_uintset_put(ap->rates, 24); /* 12 Mbps*/ l_uintset_put(ap->rates, 36); /* 18 Mbps*/ l_uintset_put(ap->rates, 48); /* 24 Mbps*/ l_uintset_put(ap->rates, 72); /* 36 Mbps*/ l_uintset_put(ap->rates, 96); /* 48 Mbps*/ l_uintset_put(ap->rates, 108); /* 54 Mbps*/ } else { l_uintset_put(ap->rates, 2); /* 1 Mbps*/ l_uintset_put(ap->rates, 11); /* 5.5 Mbps*/ l_uintset_put(ap->rates, 22); /* 11 Mbps*/ } wsc_uuid_from_addr(netdev_get_address(netdev), ap->wsc_uuid_r); if (config->passphrase[0] && crypto_psk_from_passphrase(config->passphrase, (uint8_t *) config->ssid, strlen(config->ssid), config->psk) < 0) goto error; if (!frame_watch_add(wdev_id, 0, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_REQUEST << 4), NULL, 0, ap_assoc_req_cb, ap, NULL)) goto error; if (!frame_watch_add(wdev_id, 0, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_REQUEST << 4), NULL, 0, ap_reassoc_req_cb, ap, NULL)) goto error; if (!frame_watch_add(wdev_id, 0, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_PROBE_REQUEST << 4), NULL, 0, ap_probe_req_cb, ap, NULL)) goto error; if (!frame_watch_add(wdev_id, 0, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_DISASSOCIATION << 4), NULL, 0, ap_disassoc_cb, ap, NULL)) goto error; if (!frame_watch_add(wdev_id, 0, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_AUTHENTICATION << 4), NULL, 0, ap_auth_cb, ap, NULL)) goto error; if (!frame_watch_add(wdev_id, 0, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_DEAUTHENTICATION << 4), NULL, 0, ap_deauth_cb, ap, NULL)) goto error; ap->mlme_watch = l_genl_family_register(ap->nl80211, "mlme", ap_mlme_notify, ap, NULL); if (!ap->mlme_watch) l_error("Registering for MLME notification failed"); if (wait_on_address) { if (err_out) *err_out = 0; return ap; } cmd = ap_build_cmd_start_ap(ap); if (!cmd) goto error; ap->start_stop_cmd_id = l_genl_family_send(ap->nl80211, cmd, ap_start_cb, ap, NULL); if (!ap->start_stop_cmd_id) { l_genl_msg_unref(cmd); goto error; } if (err_out) *err_out = 0; return ap; error: if (err_out) *err_out = err; ap->config = NULL; ap_reset(ap); l_genl_family_free(ap->nl80211); l_free(ap); return NULL; } static void ap_stop_cb(struct l_genl_msg *msg, void *user_data) { struct ap_state *ap = user_data; int error = l_genl_msg_get_error(msg); ap->start_stop_cmd_id = 0; if (error < 0) l_error("STOP_AP failed: %s (%i)", strerror(error), error); if (ap->stopped_func) ap->stopped_func(ap->user_data); l_genl_family_free(ap->nl80211); l_free(ap); } static struct l_genl_msg *ap_build_cmd_stop_ap(struct ap_state *ap) { struct l_genl_msg *cmd; uint32_t ifindex = netdev_get_ifindex(ap->netdev); cmd = l_genl_msg_new_sized(NL80211_CMD_STOP_AP, 16); l_genl_msg_append_attr(cmd, NL80211_ATTR_IFINDEX, 4, &ifindex); return cmd; } /* * Schedule the running @ap to be stopped and freed. The original * ops and user_data are forgotten and a new callback can be * provided if the caller needs to know when the interface becomes * free, for example for a new ap_start call. * * The user must forget @ap when @stopped_func is called. If the * @user_data ends up being destroyed before that, ap_free(ap) should * be used to prevent @stopped_func from being called. * If @stopped_func is not provided, the caller must forget @ap * immediately. */ void ap_shutdown(struct ap_state *ap, ap_stopped_func_t stopped_func, void *user_data) { struct l_genl_msg *cmd; if (ap->started) { ap->started = false; ap->ops->handle_event(AP_EVENT_STOPPING, NULL, ap->user_data); } ap_reset(ap); if (ap->gtk_set) { ap->gtk_set = false; cmd = ap_build_cmd_del_key(ap); if (!cmd) { l_error("ap_build_cmd_del_key failed"); goto free_ap; } if (!l_genl_family_send(ap->nl80211, cmd, ap_gtk_op_cb, NULL, NULL)) { l_genl_msg_unref(cmd); l_error("Issuing DEL_KEY failed"); goto free_ap; } } cmd = ap_build_cmd_stop_ap(ap); if (!cmd) { l_error("ap_build_cmd_stop_ap failed"); goto free_ap; } ap->start_stop_cmd_id = l_genl_family_send(ap->nl80211, cmd, ap_stop_cb, ap, NULL); if (!ap->start_stop_cmd_id) { l_genl_msg_unref(cmd); l_error("Sending STOP_AP failed"); goto free_ap; } ap->stopped_func = stopped_func; ap->user_data = user_data; return; free_ap: if (stopped_func) stopped_func(user_data); l_genl_family_free(ap->nl80211); l_free(ap); } /* Free @ap without a graceful shutdown */ void ap_free(struct ap_state *ap) { ap_reset(ap); l_genl_family_free(ap->nl80211); if (ap->server) l_dhcp_server_destroy(ap->server); l_free(ap); } bool ap_station_disconnect(struct ap_state *ap, const uint8_t *mac, enum mmpdu_reason_code reason) { struct sta_state *sta; if (!ap->started) return false; sta = l_queue_remove_if(ap->sta_states, ap_sta_match_addr, mac); if (!sta) return false; ap_del_station(sta, reason, false); ap_sta_free(sta); return true; } static void ap_wsc_pbc_timeout_cb(struct l_timeout *timeout, void *user_data) { struct ap_state *ap = user_data; l_debug("PBC mode timeout"); ap_wsc_exit_pbc(ap); } static void ap_wsc_pbc_timeout_destroy(void *user_data) { struct ap_state *ap = user_data; ap->wsc_pbc_timeout = NULL; } bool ap_push_button(struct ap_state *ap) { if (!ap->started) return false; if (l_queue_length(ap->wsc_pbc_probes) > 1) { l_debug("Can't start PBC mode due to Session Overlap"); return false; } /* * WSC v2.0.5 Section 11.3: "Multiple presses of the button are * permitted. If a PBC button on an Enrollee or Registrar is * pressed again during Walk Time, the timers for that device are * restarted at that time [...]" */ if (ap->wsc_pbc_timeout) { l_timeout_modify(ap->wsc_pbc_timeout, AP_WSC_PBC_WALK_TIME); return true; } ap->wsc_pbc_timeout = l_timeout_create(AP_WSC_PBC_WALK_TIME, ap_wsc_pbc_timeout_cb, ap, ap_wsc_pbc_timeout_destroy); ap->wsc_dpid = WSC_DEVICE_PASSWORD_ID_PUSH_BUTTON; ap_update_beacon(ap); return true; } struct ap_if_data { struct netdev *netdev; struct ap_state *ap; struct l_dbus_message *pending; }; static void ap_if_event_func(enum ap_event_type type, const void *event_data, void *user_data) { struct ap_if_data *ap_if = user_data; struct l_dbus_message *reply; switch (type) { case AP_EVENT_START_FAILED: if (L_WARN_ON(!ap_if->pending)) break; reply = dbus_error_failed(ap_if->pending); dbus_pending_reply(&ap_if->pending, reply); ap_if->ap = NULL; break; case AP_EVENT_STARTED: if (L_WARN_ON(!ap_if->pending)) break; reply = l_dbus_message_new_method_return(ap_if->pending); dbus_pending_reply(&ap_if->pending, reply); l_dbus_property_changed(dbus_get_bus(), netdev_get_path(ap_if->netdev), IWD_AP_INTERFACE, "Started"); break; case AP_EVENT_STOPPING: l_dbus_property_changed(dbus_get_bus(), netdev_get_path(ap_if->netdev), IWD_AP_INTERFACE, "Started"); if (!ap_if->pending) ap_if->ap = NULL; break; case AP_EVENT_STATION_ADDED: case AP_EVENT_STATION_REMOVED: case AP_EVENT_REGISTRATION_START: case AP_EVENT_REGISTRATION_SUCCESS: case AP_EVENT_PBC_MODE_EXIT: /* Ignored */ break; } } static const struct ap_ops ap_dbus_ops = { .handle_event = ap_if_event_func, }; static struct l_dbus_message *ap_dbus_start(struct l_dbus *dbus, struct l_dbus_message *message, void *user_data) { struct ap_if_data *ap_if = user_data; const char *ssid, *wpa2_passphrase; struct ap_config *config; int err; if (ap_if->ap && ap_if->ap->started) return dbus_error_already_exists(message); if (ap_if->ap || ap_if->pending) return dbus_error_busy(message); if (!l_dbus_message_get_arguments(message, "ss", &ssid, &wpa2_passphrase)) return dbus_error_invalid_args(message); config = l_new(struct ap_config, 1); config->ssid = l_strdup(ssid); l_strlcpy(config->passphrase, wpa2_passphrase, sizeof(config->passphrase)); ap_if->ap = ap_start(ap_if->netdev, config, &ap_dbus_ops, &err, ap_if); if (!ap_if->ap) { ap_config_free(config); return dbus_error_from_errno(err, message); } ap_if->pending = l_dbus_message_ref(message); return NULL; } static void ap_dbus_stop_cb(void *user_data) { struct ap_if_data *ap_if = user_data; struct l_dbus_message *reply; if (L_WARN_ON(!ap_if->pending)) return; reply = l_dbus_message_new_method_return(ap_if->pending); dbus_pending_reply(&ap_if->pending, reply); ap_if->ap = NULL; } static struct l_dbus_message *ap_dbus_stop(struct l_dbus *dbus, struct l_dbus_message *message, void *user_data) { struct ap_if_data *ap_if = user_data; if (!ap_if->ap) { if (ap_if->pending) return dbus_error_busy(message); /* already stopped, no-op */ return l_dbus_message_new_method_return(message); } if (ap_if->pending) { struct l_dbus_message *reply; reply = dbus_error_aborted(ap_if->pending); dbus_pending_reply(&ap_if->pending, reply); } ap_if->pending = l_dbus_message_ref(message); ap_shutdown(ap_if->ap, ap_dbus_stop_cb, ap_if); return NULL; } static struct l_dbus_message *ap_dbus_start_profile(struct l_dbus *dbus, struct l_dbus_message *message, void *user_data) { struct ap_if_data *ap_if = user_data; const char *ssid; struct ap_config *config; int err; if (ap_if->ap && ap_if->ap->started) return dbus_error_already_exists(message); if (ap_if->ap || ap_if->pending) return dbus_error_busy(message); if (!l_dbus_message_get_arguments(message, "s", &ssid)) return dbus_error_invalid_args(message); config = l_new(struct ap_config, 1); config->ssid = l_strdup(ssid); /* This tells ap_start to pull settings from a profile on disk */ config->profile = storage_get_path("ap/%s.ap", ssid); ap_if->ap = ap_start(ap_if->netdev, config, &ap_dbus_ops, &err, ap_if); if (!ap_if->ap) return dbus_error_from_errno(err, message); ap_if->pending = l_dbus_message_ref(message); return NULL; } static bool ap_dbus_property_get_started(struct l_dbus *dbus, struct l_dbus_message *message, struct l_dbus_message_builder *builder, void *user_data) { struct ap_if_data *ap_if = user_data; bool started = ap_if->ap && ap_if->ap->started; l_dbus_message_builder_append_basic(builder, 'b', &started); return true; } static void ap_setup_interface(struct l_dbus_interface *interface) { l_dbus_interface_method(interface, "Start", 0, ap_dbus_start, "", "ss", "ssid", "wpa2_passphrase"); l_dbus_interface_method(interface, "Stop", 0, ap_dbus_stop, "", ""); l_dbus_interface_method(interface, "StartProfile", 0, ap_dbus_start_profile, "", "s", "ssid"); l_dbus_interface_property(interface, "Started", 0, "b", ap_dbus_property_get_started, NULL); } static void ap_destroy_interface(void *user_data) { struct ap_if_data *ap_if = user_data; if (ap_if->pending) { struct l_dbus_message *reply; reply = dbus_error_aborted(ap_if->pending); dbus_pending_reply(&ap_if->pending, reply); } if (ap_if->ap) ap_free(ap_if->ap); l_free(ap_if); } static void ap_add_interface(struct netdev *netdev) { struct ap_if_data *ap_if; /* * TODO: Check wiphy supported channels and NL80211_ATTR_TX_FRAME_TYPES */ /* just allocate/set device, Start method will complete setup */ ap_if = l_new(struct ap_if_data, 1); ap_if->netdev = netdev; /* setup ap dbus interface */ l_dbus_object_add_interface(dbus_get_bus(), netdev_get_path(netdev), IWD_AP_INTERFACE, ap_if); } static void ap_remove_interface(struct netdev *netdev) { l_dbus_object_remove_interface(dbus_get_bus(), netdev_get_path(netdev), IWD_AP_INTERFACE); } static void ap_netdev_watch(struct netdev *netdev, enum netdev_watch_event event, void *userdata) { switch (event) { case NETDEV_WATCH_EVENT_UP: case NETDEV_WATCH_EVENT_NEW: if (netdev_get_iftype(netdev) == NETDEV_IFTYPE_AP && netdev_get_is_up(netdev)) ap_add_interface(netdev); break; case NETDEV_WATCH_EVENT_DOWN: case NETDEV_WATCH_EVENT_DEL: ap_remove_interface(netdev); break; default: break; } } static int ap_init(void) { const struct l_settings *settings = iwd_get_config(); bool dhcp_enable = false; netdev_watch = netdev_watch_add(ap_netdev_watch, NULL, NULL); l_dbus_register_interface(dbus_get_bus(), IWD_AP_INTERFACE, ap_setup_interface, ap_destroy_interface, false); /* * Reusing [General].EnableNetworkConfiguration as a switch to enable * DHCP server. If no value is found or it is false do not create a * DHCP server. */ l_settings_get_bool(settings, "General", "EnableNetworkConfiguration", &dhcp_enable); if (dhcp_enable) { L_AUTO_FREE_VAR(char *, ip_prefix); ip_prefix = l_settings_get_string(settings, "General", "APRanges"); if (!ip_prefix) { l_error("[General].APRanges must be set for DHCP"); return -EINVAL; } if (!ip_pool_create(ip_prefix)) return -EINVAL; } rtnl = iwd_get_rtnl(); return 0; } static void ap_exit(void) { netdev_watch_remove(netdev_watch); l_dbus_unregister_interface(dbus_get_bus(), IWD_AP_INTERFACE); ip_pool_destroy(); } IWD_MODULE(ap, ap_init, ap_exit) IWD_MODULE_DEPENDS(ap, netdev);