/* * hostapd - IEEE 802.11r - Fast BSS Transition * Copyright (c) 2004-2018, Jouni Malinen * * This software may be distributed under the terms of the BSD license. * See README for more details. */ #include "utils/includes.h" #include "utils/common.h" #include "utils/eloop.h" #include "utils/list.h" #include "common/ieee802_11_defs.h" #include "common/ieee802_11_common.h" #include "common/ocv.h" #include "common/wpa_ctrl.h" #include "drivers/driver.h" #include "crypto/aes.h" #include "crypto/aes_siv.h" #include "crypto/aes_wrap.h" #include "crypto/sha384.h" #include "crypto/random.h" #include "ap_config.h" #include "ieee802_11.h" #include "wmm.h" #include "wpa_auth.h" #include "wpa_auth_i.h" #include "pmksa_cache_auth.h" #ifdef CONFIG_IEEE80211R_AP const unsigned int ftRRBseqTimeout = 10; const unsigned int ftRRBmaxQueueLen = 100; static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, const u8 *current_ap, const u8 *sta_addr, u16 status, const u8 *resp_ies, size_t resp_ies_len); static void ft_finish_pull(struct wpa_state_machine *sm); static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx); static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx); struct tlv_list { u16 type; size_t len; const u8 *data; }; /** * wpa_ft_rrb_decrypt - Decrypt FT RRB message * @key: AES-SIV key for AEAD * @key_len: Length of key in octets * @enc: Pointer to encrypted TLVs * @enc_len: Length of encrypted TLVs in octets * @auth: Pointer to authenticated TLVs * @auth_len: Length of authenticated TLVs in octets * @src_addr: MAC address of the frame sender * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*) * @plain: Pointer to return the pointer to the allocated plaintext buffer; * needs to be freed by the caller if not NULL; * will only be returned on success * @plain_len: Pointer to return the length of the allocated plaintext buffer * in octets * Returns: 0 on success, -1 on error */ static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len, const u8 *enc, size_t enc_len, const u8 *auth, const size_t auth_len, const u8 *src_addr, u8 type, u8 **plain, size_t *plain_size) { const u8 *ad[3] = { src_addr, auth, &type }; size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) }; wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u", MAC2STR(src_addr), type); wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len); wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs", enc, enc_len); wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len); if (!key) { /* skip decryption */ *plain = os_memdup(enc, enc_len); if (enc_len > 0 && !*plain) goto err; *plain_size = enc_len; return 0; } *plain = NULL; /* SIV overhead */ if (enc_len < AES_BLOCK_SIZE) goto err; *plain = os_zalloc(enc_len - AES_BLOCK_SIZE); if (!*plain) goto err; if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len, *plain) < 0) { if (enc_len < AES_BLOCK_SIZE + 2) goto err; /* Try to work around Ethernet devices that add extra * two octet padding even if the frame is longer than * the minimum Ethernet frame. */ enc_len -= 2; if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len, *plain) < 0) goto err; } *plain_size = enc_len - AES_BLOCK_SIZE; wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs", *plain, *plain_size); return 0; err: os_free(*plain); *plain = NULL; *plain_size = 0; wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt"); return -1; } /* get first tlv record in packet matching type * @data (decrypted) packet * @return 0 on success else -1 */ static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len, u16 type, size_t *tlv_len, const u8 **tlv_data) { const struct ft_rrb_tlv *f; size_t left; le16 type16; size_t len; left = plain_len; type16 = host_to_le16(type); while (left >= sizeof(*f)) { f = (const struct ft_rrb_tlv *) plain; left -= sizeof(*f); plain += sizeof(*f); len = le_to_host16(f->len); if (left < len) { wpa_printf(MSG_DEBUG, "FT: RRB message truncated"); break; } if (f->type == type16) { *tlv_len = len; *tlv_data = plain; return 0; } left -= len; plain += len; } return -1; } static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len) { const struct ft_rrb_tlv *f; size_t left; size_t len; left = plain_len; wpa_printf(MSG_DEBUG, "FT: RRB dump message"); while (left >= sizeof(*f)) { f = (const struct ft_rrb_tlv *) plain; left -= sizeof(*f); plain += sizeof(*f); len = le_to_host16(f->len); wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu", le_to_host16(f->type), len); if (left < len) { wpa_printf(MSG_DEBUG, "FT: RRB message truncated: left %zu bytes, need %zu", left, len); break; } wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len); left -= len; plain += len; } if (left > 0) wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left); wpa_printf(MSG_DEBUG, "FT: RRB dump message end"); } static int cmp_int(const void *a, const void *b) { int x, y; x = *((int *) a); y = *((int *) b); return x - y; } static int wpa_ft_rrb_get_tlv_vlan(const u8 *plain, const size_t plain_len, struct vlan_description *vlan) { struct ft_rrb_tlv *f; size_t left; size_t len; int taggedidx; int vlan_id; int type; left = plain_len; taggedidx = 0; os_memset(vlan, 0, sizeof(*vlan)); while (left >= sizeof(*f)) { f = (struct ft_rrb_tlv *) plain; left -= sizeof(*f); plain += sizeof(*f); len = le_to_host16(f->len); type = le_to_host16(f->type); if (left < len) { wpa_printf(MSG_DEBUG, "FT: RRB message truncated"); return -1; } if (type != FT_RRB_VLAN_UNTAGGED && type != FT_RRB_VLAN_TAGGED) goto skip; if (type == FT_RRB_VLAN_UNTAGGED && len != sizeof(le16)) { wpa_printf(MSG_DEBUG, "FT: RRB VLAN_UNTAGGED invalid length"); return -1; } if (type == FT_RRB_VLAN_TAGGED && len % sizeof(le16) != 0) { wpa_printf(MSG_DEBUG, "FT: RRB VLAN_TAGGED invalid length"); return -1; } while (len >= sizeof(le16)) { vlan_id = WPA_GET_LE16(plain); plain += sizeof(le16); left -= sizeof(le16); len -= sizeof(le16); if (vlan_id <= 0 || vlan_id > MAX_VLAN_ID) { wpa_printf(MSG_DEBUG, "FT: RRB VLAN ID invalid %d", vlan_id); continue; } if (type == FT_RRB_VLAN_UNTAGGED) vlan->untagged = vlan_id; if (type == FT_RRB_VLAN_TAGGED && taggedidx < MAX_NUM_TAGGED_VLAN) { vlan->tagged[taggedidx] = vlan_id; taggedidx++; } else if (type == FT_RRB_VLAN_TAGGED) { wpa_printf(MSG_DEBUG, "FT: RRB too many VLANs"); } } skip: left -= len; plain += len; } if (taggedidx) qsort(vlan->tagged, taggedidx, sizeof(int), cmp_int); vlan->notempty = vlan->untagged || vlan->tagged[0]; return 0; } static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs) { size_t tlv_len = 0; int i; if (!tlvs) return 0; for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) { tlv_len += sizeof(struct ft_rrb_tlv); tlv_len += tlvs[i].len; } return tlv_len; } static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start, u8 *endpos) { int i; size_t tlv_len; struct ft_rrb_tlv *hdr; u8 *pos; if (!tlvs) return 0; tlv_len = 0; pos = start; for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) { if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start)) return tlv_len; tlv_len += sizeof(*hdr); hdr = (struct ft_rrb_tlv *) pos; hdr->type = host_to_le16(tlvs[i].type); hdr->len = host_to_le16(tlvs[i].len); pos = start + tlv_len; if (tlv_len + tlvs[i].len > (size_t) (endpos - start)) return tlv_len; if (tlvs[i].len == 0) continue; tlv_len += tlvs[i].len; os_memcpy(pos, tlvs[i].data, tlvs[i].len); pos = start + tlv_len; } return tlv_len; } static size_t wpa_ft_vlan_len(const struct vlan_description *vlan) { size_t tlv_len = 0; int i; if (!vlan || !vlan->notempty) return 0; if (vlan->untagged) { tlv_len += sizeof(struct ft_rrb_tlv); tlv_len += sizeof(le16); } if (vlan->tagged[0]) tlv_len += sizeof(struct ft_rrb_tlv); for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++) tlv_len += sizeof(le16); return tlv_len; } static size_t wpa_ft_vlan_lin(const struct vlan_description *vlan, u8 *start, u8 *endpos) { size_t tlv_len; int i, len; struct ft_rrb_tlv *hdr; u8 *pos = start; if (!vlan || !vlan->notempty) return 0; tlv_len = 0; if (vlan->untagged) { tlv_len += sizeof(*hdr); if (start + tlv_len > endpos) return tlv_len; hdr = (struct ft_rrb_tlv *) pos; hdr->type = host_to_le16(FT_RRB_VLAN_UNTAGGED); hdr->len = host_to_le16(sizeof(le16)); pos = start + tlv_len; tlv_len += sizeof(le16); if (start + tlv_len > endpos) return tlv_len; WPA_PUT_LE16(pos, vlan->untagged); pos = start + tlv_len; } if (!vlan->tagged[0]) return tlv_len; tlv_len += sizeof(*hdr); if (start + tlv_len > endpos) return tlv_len; hdr = (struct ft_rrb_tlv *) pos; hdr->type = host_to_le16(FT_RRB_VLAN_TAGGED); len = 0; /* len is computed below */ pos = start + tlv_len; for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++) { tlv_len += sizeof(le16); if (start + tlv_len > endpos) break; len += sizeof(le16); WPA_PUT_LE16(pos, vlan->tagged[i]); pos = start + tlv_len; } hdr->len = host_to_le16(len); return tlv_len; } static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1, const struct tlv_list *tlvs2, const struct vlan_description *vlan, u8 **plain, size_t *plain_len) { u8 *pos, *endpos; size_t tlv_len; tlv_len = wpa_ft_tlv_len(tlvs1); tlv_len += wpa_ft_tlv_len(tlvs2); tlv_len += wpa_ft_vlan_len(vlan); *plain_len = tlv_len; *plain = os_zalloc(tlv_len); if (!*plain) { wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext"); goto err; } pos = *plain; endpos = *plain + tlv_len; pos += wpa_ft_tlv_lin(tlvs1, pos, endpos); pos += wpa_ft_tlv_lin(tlvs2, pos, endpos); pos += wpa_ft_vlan_lin(vlan, pos, endpos); /* validity check */ if (pos != endpos) { wpa_printf(MSG_ERROR, "FT: Length error building RRB"); goto err; } return 0; err: os_free(*plain); *plain = NULL; *plain_len = 0; return -1; } static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len, const u8 *plain, const size_t plain_len, const u8 *auth, const size_t auth_len, const u8 *src_addr, u8 type, u8 *enc) { const u8 *ad[3] = { src_addr, auth, &type }; size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) }; wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u", MAC2STR(src_addr), type); wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message", plain, plain_len); wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len); wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len); if (!key) { /* encryption not needed, return plaintext as packet */ os_memcpy(enc, plain, plain_len); } else if (aes_siv_encrypt(key, key_len, plain, plain_len, 3, ad, ad_len, enc) < 0) { wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message"); return -1; } wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs", enc, plain_len + AES_BLOCK_SIZE); return 0; } /** * wpa_ft_rrb_build - Build and encrypt an FT RRB message * @key: AES-SIV key for AEAD * @key_len: Length of key in octets * @tlvs_enc0: First set of to-be-encrypted TLVs * @tlvs_enc1: Second set of to-be-encrypted TLVs * @tlvs_auth: Set of to-be-authenticated TLVs * @src_addr: MAC address of the frame sender * @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*) * @packet Pointer to return the pointer to the allocated packet buffer; * needs to be freed by the caller if not null; * will only be returned on success * @packet_len: Pointer to return the length of the allocated buffer in octets * Returns: 0 on success, -1 on error */ static int wpa_ft_rrb_build(const u8 *key, const size_t key_len, const struct tlv_list *tlvs_enc0, const struct tlv_list *tlvs_enc1, const struct tlv_list *tlvs_auth, const struct vlan_description *vlan, const u8 *src_addr, u8 type, u8 **packet, size_t *packet_len) { u8 *plain = NULL, *auth = NULL, *pos, *tmp; size_t plain_len = 0, auth_len = 0; int ret = -1; size_t pad_len = 0; *packet = NULL; if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, vlan, &plain, &plain_len) < 0) goto out; if (wpa_ft_rrb_lin(tlvs_auth, NULL, NULL, &auth, &auth_len) < 0) goto out; *packet_len = sizeof(u16) + auth_len + plain_len; if (key) *packet_len += AES_BLOCK_SIZE; #define RRB_MIN_MSG_LEN 64 if (*packet_len < RRB_MIN_MSG_LEN) { pad_len = RRB_MIN_MSG_LEN - *packet_len; if (pad_len < sizeof(struct ft_rrb_tlv)) pad_len = sizeof(struct ft_rrb_tlv); wpa_printf(MSG_DEBUG, "FT: Pad message to minimum Ethernet frame length (%d --> %d)", (int) *packet_len, (int) (*packet_len + pad_len)); *packet_len += pad_len; tmp = os_realloc(auth, auth_len + pad_len); if (!tmp) goto out; auth = tmp; pos = auth + auth_len; WPA_PUT_LE16(pos, FT_RRB_LAST_EMPTY); pos += 2; WPA_PUT_LE16(pos, pad_len - sizeof(struct ft_rrb_tlv)); pos += 2; os_memset(pos, 0, pad_len - sizeof(struct ft_rrb_tlv)); auth_len += pad_len; } *packet = os_zalloc(*packet_len); if (!*packet) goto out; pos = *packet; WPA_PUT_LE16(pos, auth_len); pos += 2; os_memcpy(pos, auth, auth_len); pos += auth_len; if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth, auth_len, src_addr, type, pos) < 0) goto out; wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", *packet, *packet_len); ret = 0; out: bin_clear_free(plain, plain_len); os_free(auth); if (ret) { wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message"); os_free(*packet); *packet = NULL; *packet_len = 0; } return ret; } #define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \ if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \ &f_##field##_len, &f_##field) < 0 || \ (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \ wpa_printf(MSG_INFO, "FT: Missing required " #field \ " in %s from " MACSTR, txt, MAC2STR(src_addr)); \ wpa_ft_rrb_dump(srcfield, srcfield##_len); \ goto out; \ } \ } while (0) #define RRB_GET(type, field, txt, checklength) \ RRB_GET_SRC(plain, type, field, txt, checklength) #define RRB_GET_AUTH(type, field, txt, checklength) \ RRB_GET_SRC(auth, type, field, txt, checklength) #define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \ if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \ &f_##field##_len, &f_##field) < 0 || \ (checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \ wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \ " in %s from " MACSTR, txt, MAC2STR(src_addr)); \ f_##field##_len = 0; \ f_##field = NULL; \ } \ } while (0) #define RRB_GET_OPTIONAL(type, field, txt, checklength) \ RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength) #define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \ RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength) static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst, const u8 *data, size_t data_len) { if (wpa_auth->cb->send_ether == NULL) return -1; wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst)); return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB, data, data_len); } static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth, const u8 *dst, u8 oui_suffix, const u8 *data, size_t data_len) { if (!wpa_auth->cb->send_oui) return -1; wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR " (len=%u)", oui_suffix, MAC2STR(dst), (unsigned int) data_len); return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, data, data_len); } static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth, const u8 *dst, const u8 *data, size_t data_len) { if (wpa_auth->cb->send_ft_action == NULL) return -1; return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst, data, data_len); } static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth, const u8 *addr, const u8 *p2p_dev_addr, const u8 *prev_psk) { if (wpa_auth->cb->get_psk == NULL) return NULL; return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr, prev_psk, NULL, NULL); } static struct wpa_state_machine * wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) { if (wpa_auth->cb->add_sta == NULL) return NULL; return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr); } static int wpa_ft_set_vlan(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, struct vlan_description *vlan) { if (!wpa_auth->cb->set_vlan) return -1; return wpa_auth->cb->set_vlan(wpa_auth->cb_ctx, sta_addr, vlan); } static int wpa_ft_get_vlan(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, struct vlan_description *vlan) { if (!wpa_auth->cb->get_vlan) return -1; return wpa_auth->cb->get_vlan(wpa_auth->cb_ctx, sta_addr, vlan); } static int wpa_ft_set_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, const u8 *identity, size_t identity_len) { if (!wpa_auth->cb->set_identity) return -1; return wpa_auth->cb->set_identity(wpa_auth->cb_ctx, sta_addr, identity, identity_len); } static size_t wpa_ft_get_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, const u8 **buf) { *buf = NULL; if (!wpa_auth->cb->get_identity) return 0; return wpa_auth->cb->get_identity(wpa_auth->cb_ctx, sta_addr, buf); } static int wpa_ft_set_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, const u8 *radius_cui, size_t radius_cui_len) { if (!wpa_auth->cb->set_radius_cui) return -1; return wpa_auth->cb->set_radius_cui(wpa_auth->cb_ctx, sta_addr, radius_cui, radius_cui_len); } static size_t wpa_ft_get_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, const u8 **buf) { *buf = NULL; if (!wpa_auth->cb->get_radius_cui) return 0; return wpa_auth->cb->get_radius_cui(wpa_auth->cb_ctx, sta_addr, buf); } static void wpa_ft_set_session_timeout(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, int session_timeout) { if (!wpa_auth->cb->set_session_timeout) return; wpa_auth->cb->set_session_timeout(wpa_auth->cb_ctx, sta_addr, session_timeout); } static int wpa_ft_get_session_timeout(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) { if (!wpa_auth->cb->get_session_timeout) return 0; return wpa_auth->cb->get_session_timeout(wpa_auth->cb_ctx, sta_addr); } static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth, const u8 *sta_addr, u8 *tspec_ie, size_t tspec_ielen) { if (wpa_auth->cb->add_tspec == NULL) { wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized"); return -1; } return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie, tspec_ielen); } #ifdef CONFIG_OCV static int wpa_channel_info(struct wpa_authenticator *wpa_auth, struct wpa_channel_info *ci) { if (!wpa_auth->cb->channel_info) return -1; return wpa_auth->cb->channel_info(wpa_auth->cb_ctx, ci); } #endif /* CONFIG_OCV */ int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) { u8 *pos = buf; u8 capab; if (len < 2 + sizeof(struct rsn_mdie)) return -1; *pos++ = WLAN_EID_MOBILITY_DOMAIN; *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); pos += MOBILITY_DOMAIN_ID_LEN; capab = 0; if (conf->ft_over_ds) capab |= RSN_FT_CAPAB_FT_OVER_DS; *pos++ = capab; return pos - buf; } int wpa_write_ftie(struct wpa_auth_config *conf, int use_sha384, const u8 *r0kh_id, size_t r0kh_id_len, const u8 *anonce, const u8 *snonce, u8 *buf, size_t len, const u8 *subelem, size_t subelem_len, int rsnxe_used) { u8 *pos = buf, *ielen; size_t hdrlen = use_sha384 ? sizeof(struct rsn_ftie_sha384) : sizeof(struct rsn_ftie); if (len < 2 + hdrlen + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + subelem_len) return -1; *pos++ = WLAN_EID_FAST_BSS_TRANSITION; ielen = pos++; if (use_sha384) { struct rsn_ftie_sha384 *hdr = (struct rsn_ftie_sha384 *) pos; os_memset(hdr, 0, sizeof(*hdr)); pos += sizeof(*hdr); WPA_PUT_LE16(hdr->mic_control, !!rsnxe_used); if (anonce) os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); if (snonce) os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); } else { struct rsn_ftie *hdr = (struct rsn_ftie *) pos; os_memset(hdr, 0, sizeof(*hdr)); pos += sizeof(*hdr); WPA_PUT_LE16(hdr->mic_control, !!rsnxe_used); if (anonce) os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); if (snonce) os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); } /* Optional Parameters */ *pos++ = FTIE_SUBELEM_R1KH_ID; *pos++ = FT_R1KH_ID_LEN; os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); pos += FT_R1KH_ID_LEN; if (r0kh_id) { *pos++ = FTIE_SUBELEM_R0KH_ID; *pos++ = r0kh_id_len; os_memcpy(pos, r0kh_id, r0kh_id_len); pos += r0kh_id_len; } if (subelem) { os_memcpy(pos, subelem, subelem_len); pos += subelem_len; } *ielen = pos - buf - 2; return pos - buf; } /* A packet to be handled after seq response */ struct ft_remote_item { struct dl_list list; u8 nonce[FT_RRB_NONCE_LEN]; struct os_reltime nonce_ts; u8 src_addr[ETH_ALEN]; u8 *enc; size_t enc_len; u8 *auth; size_t auth_len; int (*cb)(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer); }; static void wpa_ft_rrb_seq_free(struct ft_remote_item *item) { eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item); dl_list_del(&item->list); bin_clear_free(item->enc, item->enc_len); os_free(item->auth); os_free(item); } static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth, struct ft_remote_seq *rkh_seq, int cb) { struct ft_remote_item *item, *n; dl_list_for_each_safe(item, n, &rkh_seq->rx.queue, struct ft_remote_item, list) { if (cb && item->cb) item->cb(wpa_auth, item->src_addr, item->enc, item->enc_len, item->auth, item->auth_len, 1); wpa_ft_rrb_seq_free(item); } } static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx) { struct ft_remote_item *item = timeout_ctx; wpa_ft_rrb_seq_free(item); } static int wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth, struct ft_remote_seq *rkh_seq, const u8 *src_addr, const u8 *f_r0kh_id, size_t f_r0kh_id_len, const u8 *f_r1kh_id, const u8 *key, size_t key_len, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int (*cb)(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer)) { struct ft_remote_item *item = NULL; u8 *packet = NULL; size_t packet_len; struct tlv_list seq_req_auth[] = { { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN, .data = NULL /* to be filled: item->nonce */ }, { .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len, .data = f_r0kh_id }, { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN, .data = f_r1kh_id }, { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL }, }; if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) { wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long"); goto err; } wpa_printf(MSG_DEBUG, "FT: Send sequence number request from " MACSTR " to " MACSTR, MAC2STR(wpa_auth->addr), MAC2STR(src_addr)); item = os_zalloc(sizeof(*item)); if (!item) goto err; os_memcpy(item->src_addr, src_addr, ETH_ALEN); item->cb = cb; if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) { wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes"); goto err; } if (os_get_reltime(&item->nonce_ts) < 0) goto err; if (enc && enc_len > 0) { item->enc = os_memdup(enc, enc_len); item->enc_len = enc_len; if (!item->enc) goto err; } if (auth && auth_len > 0) { item->auth = os_memdup(auth, auth_len); item->auth_len = auth_len; if (!item->auth) goto err; } eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout, wpa_auth, item); seq_req_auth[0].data = item->nonce; if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth, NULL, wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ, &packet, &packet_len) < 0) { item = NULL; /* some other seq resp might still accept this */ goto err; } dl_list_add(&rkh_seq->rx.queue, &item->list); wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ, packet, packet_len); os_free(packet); return 0; err: wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request"); if (item) { os_free(item->auth); bin_clear_free(item->enc, item->enc_len); os_free(item); } return -1; } #define FT_RRB_SEQ_OK 0 #define FT_RRB_SEQ_DROP 1 #define FT_RRB_SEQ_DEFER 2 static int wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, const char *msgtype, int no_defer) { const u8 *f_seq; size_t f_seq_len; const struct ft_rrb_seq *msg_both; u32 msg_seq, msg_off, rkh_off; struct os_reltime now; unsigned int i; RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both)); wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len); msg_both = (const struct ft_rrb_seq *) f_seq; if (rkh_seq->rx.num_last == 0) { /* first packet from remote */ goto defer; } if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) { /* remote might have rebooted */ goto defer; } if (os_get_reltime(&now) == 0) { u32 msg_ts_now_remote, msg_ts_off; struct os_reltime now_remote; os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote); msg_ts_now_remote = now_remote.sec; msg_ts_off = le_to_host32(msg_both->ts) - (msg_ts_now_remote - ftRRBseqTimeout); if (msg_ts_off > 2 * ftRRBseqTimeout) goto defer; } msg_seq = le_to_host32(msg_both->seq); rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx]; msg_off = msg_seq - rkh_off; if (msg_off > 0xC0000000) goto out; /* too old message, drop it */ if (msg_off <= 0x40000000) { for (i = 0; i < rkh_seq->rx.num_last; i++) { if (rkh_seq->rx.last[i] == msg_seq) goto out; /* duplicate message, drop it */ } return FT_RRB_SEQ_OK; } defer: if (no_defer) goto out; wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from " MACSTR, msgtype, MAC2STR(src_addr)); return FT_RRB_SEQ_DEFER; out: wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR, msgtype, MAC2STR(src_addr)); return FT_RRB_SEQ_DROP; } static void wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth, struct ft_remote_seq *rkh_seq, const u8 *src_addr, const u8 *auth, size_t auth_len, const char *msgtype) { const u8 *f_seq; size_t f_seq_len; const struct ft_rrb_seq *msg_both; u32 msg_seq, msg_off, min_off, rkh_off; int minidx = 0; unsigned int i; RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both)); msg_both = (const struct ft_rrb_seq *) f_seq; msg_seq = le_to_host32(msg_both->seq); if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) { rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq; rkh_seq->rx.num_last++; return; } rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx]; for (i = 0; i < rkh_seq->rx.num_last; i++) { msg_off = rkh_seq->rx.last[i] - rkh_off; min_off = rkh_seq->rx.last[minidx] - rkh_off; if (msg_off < min_off && i != rkh_seq->rx.offsetidx) minidx = i; } rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq; rkh_seq->rx.offsetidx = minidx; return; out: /* RRB_GET_AUTH should never fail here as * wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */ wpa_printf(MSG_ERROR, "FT: %s() failed", __func__); } static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq, struct ft_rrb_seq *f_seq) { struct os_reltime now; if (os_get_reltime(&now) < 0) return -1; if (!rkh_seq->tx.dom) { if (random_get_bytes((u8 *) &rkh_seq->tx.seq, sizeof(rkh_seq->tx.seq))) { wpa_printf(MSG_ERROR, "FT: Failed to get random data for sequence number initialization"); rkh_seq->tx.seq = now.usec; } if (random_get_bytes((u8 *) &rkh_seq->tx.dom, sizeof(rkh_seq->tx.dom))) { wpa_printf(MSG_ERROR, "FT: Failed to get random data for sequence number initialization"); rkh_seq->tx.dom = now.usec; } rkh_seq->tx.dom |= 1; } f_seq->dom = host_to_le32(rkh_seq->tx.dom); f_seq->seq = host_to_le32(rkh_seq->tx.seq); f_seq->ts = host_to_le32(now.sec); rkh_seq->tx.seq++; return 0; } struct wpa_ft_pmk_r0_sa { struct dl_list list; u8 pmk_r0[PMK_LEN_MAX]; size_t pmk_r0_len; u8 pmk_r0_name[WPA_PMK_NAME_LEN]; u8 spa[ETH_ALEN]; int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ struct vlan_description *vlan; os_time_t expiration; /* 0 for no expiration */ u8 *identity; size_t identity_len; u8 *radius_cui; size_t radius_cui_len; os_time_t session_timeout; /* 0 for no expiration */ /* TODO: radius_class, EAP type */ int pmk_r1_pushed; }; struct wpa_ft_pmk_r1_sa { struct dl_list list; u8 pmk_r1[PMK_LEN_MAX]; size_t pmk_r1_len; u8 pmk_r1_name[WPA_PMK_NAME_LEN]; u8 spa[ETH_ALEN]; int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */ struct vlan_description *vlan; u8 *identity; size_t identity_len; u8 *radius_cui; size_t radius_cui_len; os_time_t session_timeout; /* 0 for no expiration */ /* TODO: radius_class, EAP type */ }; struct wpa_ft_pmk_cache { struct dl_list pmk_r0; /* struct wpa_ft_pmk_r0_sa */ struct dl_list pmk_r1; /* struct wpa_ft_pmk_r1_sa */ }; static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx); static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx); static void wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa *r0) { if (!r0) return; dl_list_del(&r0->list); eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL); os_memset(r0->pmk_r0, 0, PMK_LEN_MAX); os_free(r0->vlan); os_free(r0->identity); os_free(r0->radius_cui); os_free(r0); } static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx) { struct wpa_ft_pmk_r0_sa *r0 = eloop_ctx; struct os_reltime now; int expires_in; int session_timeout; os_get_reltime(&now); if (!r0) return; expires_in = r0->expiration - now.sec; session_timeout = r0->session_timeout - now.sec; /* conditions to remove from cache: * a) r0->expiration is set and hit * -or- * b) r0->session_timeout is set and hit */ if ((!r0->expiration || expires_in > 0) && (!r0->session_timeout || session_timeout > 0)) { wpa_printf(MSG_ERROR, "FT: %s() called for non-expired entry %p", __func__, r0); eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL); if (r0->expiration && expires_in > 0) eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r0, r0, NULL); if (r0->session_timeout && session_timeout > 0) eloop_register_timeout(session_timeout + 1, 0, wpa_ft_expire_pmk_r0, r0, NULL); return; } wpa_ft_free_pmk_r0(r0); } static void wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa *r1) { if (!r1) return; dl_list_del(&r1->list); eloop_cancel_timeout(wpa_ft_expire_pmk_r1, r1, NULL); os_memset(r1->pmk_r1, 0, PMK_LEN_MAX); os_free(r1->vlan); os_free(r1->identity); os_free(r1->radius_cui); os_free(r1); } static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx) { struct wpa_ft_pmk_r1_sa *r1 = eloop_ctx; wpa_ft_free_pmk_r1(r1); } struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) { struct wpa_ft_pmk_cache *cache; cache = os_zalloc(sizeof(*cache)); if (cache) { dl_list_init(&cache->pmk_r0); dl_list_init(&cache->pmk_r1); } return cache; } void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) { struct wpa_ft_pmk_r0_sa *r0, *r0prev; struct wpa_ft_pmk_r1_sa *r1, *r1prev; dl_list_for_each_safe(r0, r0prev, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) wpa_ft_free_pmk_r0(r0); dl_list_for_each_safe(r1, r1prev, &cache->pmk_r1, struct wpa_ft_pmk_r1_sa, list) wpa_ft_free_pmk_r1(r1); os_free(cache); } static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, const u8 *spa, const u8 *pmk_r0, size_t pmk_r0_len, const u8 *pmk_r0_name, int pairwise, const struct vlan_description *vlan, int expires_in, int session_timeout, const u8 *identity, size_t identity_len, const u8 *radius_cui, size_t radius_cui_len) { struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; struct wpa_ft_pmk_r0_sa *r0; struct os_reltime now; /* TODO: add limit on number of entries in cache */ os_get_reltime(&now); r0 = os_zalloc(sizeof(*r0)); if (r0 == NULL) return -1; os_memcpy(r0->pmk_r0, pmk_r0, pmk_r0_len); r0->pmk_r0_len = pmk_r0_len; os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); os_memcpy(r0->spa, spa, ETH_ALEN); r0->pairwise = pairwise; if (expires_in > 0) r0->expiration = now.sec + expires_in; if (vlan && vlan->notempty) { r0->vlan = os_zalloc(sizeof(*vlan)); if (!r0->vlan) { bin_clear_free(r0, sizeof(*r0)); return -1; } *r0->vlan = *vlan; } if (identity) { r0->identity = os_malloc(identity_len); if (r0->identity) { os_memcpy(r0->identity, identity, identity_len); r0->identity_len = identity_len; } } if (radius_cui) { r0->radius_cui = os_malloc(radius_cui_len); if (r0->radius_cui) { os_memcpy(r0->radius_cui, radius_cui, radius_cui_len); r0->radius_cui_len = radius_cui_len; } } if (session_timeout > 0) r0->session_timeout = now.sec + session_timeout; dl_list_add(&cache->pmk_r0, &r0->list); if (expires_in > 0) eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r0, r0, NULL); if (session_timeout > 0) eloop_register_timeout(session_timeout + 1, 0, wpa_ft_expire_pmk_r0, r0, NULL); return 0; } static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, const u8 *spa, const u8 *pmk_r0_name, const struct wpa_ft_pmk_r0_sa **r0_out) { struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; struct wpa_ft_pmk_r0_sa *r0; struct os_reltime now; os_get_reltime(&now); dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) { if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && os_memcmp_const(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN) == 0) { *r0_out = r0; return 0; } } *r0_out = NULL; return -1; } static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *spa, const u8 *pmk_r1, size_t pmk_r1_len, const u8 *pmk_r1_name, int pairwise, const struct vlan_description *vlan, int expires_in, int session_timeout, const u8 *identity, size_t identity_len, const u8 *radius_cui, size_t radius_cui_len) { struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; int max_expires_in = wpa_auth->conf.r1_max_key_lifetime; struct wpa_ft_pmk_r1_sa *r1; struct os_reltime now; /* TODO: limit on number of entries in cache */ os_get_reltime(&now); if (max_expires_in && (max_expires_in < expires_in || expires_in == 0)) expires_in = max_expires_in; r1 = os_zalloc(sizeof(*r1)); if (r1 == NULL) return -1; os_memcpy(r1->pmk_r1, pmk_r1, pmk_r1_len); r1->pmk_r1_len = pmk_r1_len; os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); os_memcpy(r1->spa, spa, ETH_ALEN); r1->pairwise = pairwise; if (vlan && vlan->notempty) { r1->vlan = os_zalloc(sizeof(*vlan)); if (!r1->vlan) { bin_clear_free(r1, sizeof(*r1)); return -1; } *r1->vlan = *vlan; } if (identity) { r1->identity = os_malloc(identity_len); if (r1->identity) { os_memcpy(r1->identity, identity, identity_len); r1->identity_len = identity_len; } } if (radius_cui) { r1->radius_cui = os_malloc(radius_cui_len); if (r1->radius_cui) { os_memcpy(r1->radius_cui, radius_cui, radius_cui_len); r1->radius_cui_len = radius_cui_len; } } if (session_timeout > 0) r1->session_timeout = now.sec + session_timeout; dl_list_add(&cache->pmk_r1, &r1->list); if (expires_in > 0) eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r1, r1, NULL); if (session_timeout > 0) eloop_register_timeout(session_timeout + 1, 0, wpa_ft_expire_pmk_r1, r1, NULL); return 0; } int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *spa, const u8 *pmk_r1_name, u8 *pmk_r1, size_t *pmk_r1_len, int *pairwise, struct vlan_description *vlan, const u8 **identity, size_t *identity_len, const u8 **radius_cui, size_t *radius_cui_len, int *session_timeout) { struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; struct wpa_ft_pmk_r1_sa *r1; struct os_reltime now; os_get_reltime(&now); dl_list_for_each(r1, &cache->pmk_r1, struct wpa_ft_pmk_r1_sa, list) { if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && os_memcmp_const(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN) == 0) { os_memcpy(pmk_r1, r1->pmk_r1, r1->pmk_r1_len); *pmk_r1_len = r1->pmk_r1_len; if (pairwise) *pairwise = r1->pairwise; if (vlan && r1->vlan) *vlan = *r1->vlan; if (vlan && !r1->vlan) os_memset(vlan, 0, sizeof(*vlan)); if (identity && identity_len) { *identity = r1->identity; *identity_len = r1->identity_len; } if (radius_cui && radius_cui_len) { *radius_cui = r1->radius_cui; *radius_cui_len = r1->radius_cui_len; } if (session_timeout && r1->session_timeout > now.sec) *session_timeout = r1->session_timeout - now.sec; else if (session_timeout && r1->session_timeout) *session_timeout = 1; else if (session_timeout) *session_timeout = 0; return 0; } } return -1; } static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh) { if (r0kh->seq) return 0; r0kh->seq = os_zalloc(sizeof(*r0kh->seq)); if (!r0kh->seq) { wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq"); return -1; } dl_list_init(&r0kh->seq->rx.queue); return 0; } static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth, const u8 *f_r0kh_id, size_t f_r0kh_id_len, struct ft_remote_r0kh **r0kh_out, struct ft_remote_r0kh **r0kh_wildcard) { struct ft_remote_r0kh *r0kh; *r0kh_wildcard = NULL; *r0kh_out = NULL; if (wpa_auth->conf.r0kh_list) r0kh = *wpa_auth->conf.r0kh_list; else r0kh = NULL; for (; r0kh; r0kh = r0kh->next) { if (r0kh->id_len == 1 && r0kh->id[0] == '*') *r0kh_wildcard = r0kh; if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len && os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0) *r0kh_out = r0kh; } if (!*r0kh_out && !*r0kh_wildcard) wpa_printf(MSG_DEBUG, "FT: No matching R0KH found"); if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0) *r0kh_out = NULL; } static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh) { if (r1kh->seq) return 0; r1kh->seq = os_zalloc(sizeof(*r1kh->seq)); if (!r1kh->seq) { wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq"); return -1; } dl_list_init(&r1kh->seq->rx.queue); return 0; } static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth, const u8 *f_r1kh_id, struct ft_remote_r1kh **r1kh_out, struct ft_remote_r1kh **r1kh_wildcard) { struct ft_remote_r1kh *r1kh; *r1kh_wildcard = NULL; *r1kh_out = NULL; if (wpa_auth->conf.r1kh_list) r1kh = *wpa_auth->conf.r1kh_list; else r1kh = NULL; for (; r1kh; r1kh = r1kh->next) { if (is_zero_ether_addr(r1kh->addr) && is_zero_ether_addr(r1kh->id)) *r1kh_wildcard = r1kh; if (f_r1kh_id && os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0) *r1kh_out = r1kh; } if (!*r1kh_out && !*r1kh_wildcard) wpa_printf(MSG_DEBUG, "FT: No matching R1KH found"); if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0) *r1kh_out = NULL; } static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth, const u8 *f_r0kh_id, size_t f_r0kh_id_len) { if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len || os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder, f_r0kh_id_len) != 0) return -1; return 0; } static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth, const u8 *f_r1kh_id) { if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) != 0) return -1; return 0; } static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx) { struct wpa_authenticator *wpa_auth = eloop_ctx; struct ft_remote_r0kh *r0kh, *prev = NULL; if (!wpa_auth->conf.r0kh_list) return; for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) { if (r0kh == timeout_ctx) break; prev = r0kh; } if (!r0kh) return; if (prev) prev->next = r0kh->next; else *wpa_auth->conf.r0kh_list = r0kh->next; if (r0kh->seq) wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0); os_free(r0kh->seq); os_free(r0kh); } static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth, struct ft_remote_r0kh *r0kh, int timeout) { if (timeout > 0) eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh, wpa_auth, r0kh); } static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth, struct ft_remote_r0kh *r0kh, int timeout) { eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh); if (timeout > 0) eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh, wpa_auth, r0kh); } static struct ft_remote_r0kh * wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth, struct ft_remote_r0kh *r0kh_wildcard, const u8 *src_addr, const u8 *r0kh_id, size_t id_len, int timeout) { struct ft_remote_r0kh *r0kh; if (!wpa_auth->conf.r0kh_list) return NULL; r0kh = os_zalloc(sizeof(*r0kh)); if (!r0kh) return NULL; if (src_addr) os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr)); if (id_len > FT_R0KH_ID_MAX_LEN) id_len = FT_R0KH_ID_MAX_LEN; os_memcpy(r0kh->id, r0kh_id, id_len); r0kh->id_len = id_len; os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key)); r0kh->next = *wpa_auth->conf.r0kh_list; *wpa_auth->conf.r0kh_list = r0kh; if (timeout > 0) eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh, wpa_auth, r0kh); if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0) return NULL; return r0kh; } static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx) { struct wpa_authenticator *wpa_auth = eloop_ctx; struct ft_remote_r1kh *r1kh, *prev = NULL; if (!wpa_auth->conf.r1kh_list) return; for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) { if (r1kh == timeout_ctx) break; prev = r1kh; } if (!r1kh) return; if (prev) prev->next = r1kh->next; else *wpa_auth->conf.r1kh_list = r1kh->next; if (r1kh->seq) wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0); os_free(r1kh->seq); os_free(r1kh); } static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth, struct ft_remote_r1kh *r1kh, int timeout) { if (timeout > 0) eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh, wpa_auth, r1kh); } static struct ft_remote_r1kh * wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth, struct ft_remote_r1kh *r1kh_wildcard, const u8 *src_addr, const u8 *r1kh_id, int timeout) { struct ft_remote_r1kh *r1kh; if (!wpa_auth->conf.r1kh_list) return NULL; r1kh = os_zalloc(sizeof(*r1kh)); if (!r1kh) return NULL; os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr)); os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id)); os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key)); r1kh->next = *wpa_auth->conf.r1kh_list; *wpa_auth->conf.r1kh_list = r1kh; if (timeout > 0) eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh, wpa_auth, r1kh); if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0) return NULL; return r1kh; } void wpa_ft_sta_deinit(struct wpa_state_machine *sm) { eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL); } static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth) { struct ft_remote_r0kh *r0kh; struct ft_remote_r1kh *r1kh; eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX); if (wpa_auth->conf.r0kh_list) r0kh = *wpa_auth->conf.r0kh_list; else r0kh = NULL; for (; r0kh; r0kh = r0kh->next) { if (!r0kh->seq) continue; wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0); os_free(r0kh->seq); r0kh->seq = NULL; } if (wpa_auth->conf.r1kh_list) r1kh = *wpa_auth->conf.r1kh_list; else r1kh = NULL; for (; r1kh; r1kh = r1kh->next) { if (!r1kh->seq) continue; wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0); os_free(r1kh->seq); r1kh->seq = NULL; } } static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth) { struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL; struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL; if (wpa_auth->conf.r0kh_list) r0kh = *wpa_auth->conf.r0kh_list; else r0kh = NULL; while (r0kh) { r0kh_next = r0kh->next; if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh) > 0) { if (r0kh_prev) r0kh_prev->next = r0kh_next; else *wpa_auth->conf.r0kh_list = r0kh_next; os_free(r0kh); } else { r0kh_prev = r0kh; } r0kh = r0kh_next; } if (wpa_auth->conf.r1kh_list) r1kh = *wpa_auth->conf.r1kh_list; else r1kh = NULL; while (r1kh) { r1kh_next = r1kh->next; if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth, r1kh) > 0) { if (r1kh_prev) r1kh_prev->next = r1kh_next; else *wpa_auth->conf.r1kh_list = r1kh_next; os_free(r1kh); } else { r1kh_prev = r1kh; } r1kh = r1kh_next; } } void wpa_ft_deinit(struct wpa_authenticator *wpa_auth) { wpa_ft_deinit_seq(wpa_auth); wpa_ft_deinit_rkh_tmp(wpa_auth); } static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth, const u8 *f_r0kh_id, size_t f_r0kh_id_len) { struct ft_remote_r0kh *r0kh, *r0kh_wildcard; if (!wpa_auth->conf.rkh_neg_timeout) return; wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh, &r0kh_wildcard); if (!r0kh_wildcard) { /* r0kh removed after neg_timeout and might need re-adding */ return; } wpa_hexdump(MSG_DEBUG, "FT: Temporarily block R0KH-ID", f_r0kh_id, f_r0kh_id_len); if (r0kh) { wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh, wpa_auth->conf.rkh_neg_timeout); os_memset(r0kh->addr, 0, ETH_ALEN); } else wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id, f_r0kh_id_len, wpa_auth->conf.rkh_neg_timeout); } static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx) { struct wpa_state_machine *sm = eloop_ctx; wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR, MAC2STR(sm->addr)); if (sm->ft_pending_pull_left_retries <= 0) wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len); /* cancel multiple timeouts */ eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL); ft_finish_pull(sm); } static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm, const u8 *ies, size_t ies_len, const u8 *pmk_r0_name) { struct ft_remote_r0kh *r0kh, *r0kh_wildcard; u8 *packet = NULL; const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder; size_t packet_len, key_len; struct ft_rrb_seq f_seq; int tsecs, tusecs, first; struct wpabuf *ft_pending_req_ies; int r0kh_timeout; struct tlv_list req_enc[] = { { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN, .data = pmk_r0_name }, { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN, .data = sm->addr }, { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL }, }; struct tlv_list req_auth[] = { { .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN, .data = sm->ft_pending_pull_nonce }, { .type = FT_RRB_SEQ, .len = sizeof(f_seq), .data = (u8 *) &f_seq }, { .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len, .data = sm->r0kh_id }, { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN, .data = f_r1kh_id }, { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL }, }; if (sm->ft_pending_pull_left_retries <= 0) return -1; first = sm->ft_pending_pull_left_retries == sm->wpa_auth->conf.rkh_pull_retries; sm->ft_pending_pull_left_retries--; wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len, &r0kh, &r0kh_wildcard); /* Keep r0kh sufficiently long in the list for seq num check */ r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 + 1 + ftRRBseqTimeout; if (r0kh) { wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout); } else if (r0kh_wildcard) { wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID"); /* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */ r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard, r0kh_wildcard->addr, sm->r0kh_id, sm->r0kh_id_len, r0kh_timeout); } if (r0kh == NULL) { wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID", sm->r0kh_id, sm->r0kh_id_len); return -1; } if (is_zero_ether_addr(r0kh->addr)) { wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is temporarily blocked", sm->r0kh_id, sm->r0kh_id_len); return -1; } if (os_memcmp(r0kh->addr, sm->wpa_auth->addr, ETH_ALEN) == 0) { wpa_printf(MSG_DEBUG, "FT: R0KH-ID points to self - no matching key available"); return -1; } key = r0kh->key; key_len = sizeof(r0kh->key); if (r0kh->seq->rx.num_last == 0) { /* A sequence request will be sent out anyway when pull * response is received. Send it out now to avoid one RTT. */ wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr, r0kh->id, r0kh->id_len, f_r1kh_id, key, key_len, NULL, 0, NULL, 0, NULL); } wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request from " MACSTR " to remote R0KH address " MACSTR, MAC2STR(sm->wpa_auth->addr), MAC2STR(r0kh->addr)); if (first && random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " "nonce"); return -1; } if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to get seq num"); return -1; } if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth, NULL, sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL, &packet, &packet_len) < 0) return -1; ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len); wpabuf_free(sm->ft_pending_req_ies); sm->ft_pending_req_ies = ft_pending_req_ies; if (!sm->ft_pending_req_ies) { os_free(packet); return -1; } tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000; tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000; eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL); wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL, packet, packet_len); os_free(packet); return 0; } int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm, const u8 *pmk_r0, const u8 *pmk_r0_name) { int expires_in = sm->wpa_auth->conf.r0_key_lifetime; struct vlan_description vlan; const u8 *identity, *radius_cui; size_t identity_len, radius_cui_len; int session_timeout; size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ? SHA384_MAC_LEN : PMK_LEN; if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) { wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR, MAC2STR(sm->addr)); return -1; } identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity); radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr, &radius_cui); session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr); return wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len, pmk_r0_name, sm->pairwise, &vlan, expires_in, session_timeout, identity, identity_len, radius_cui, radius_cui_len); } int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, struct wpa_ptk *ptk) { u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN]; size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ? SHA384_MAC_LEN : PMK_LEN; size_t pmk_r1_len = pmk_r0_len; u8 pmk_r1[PMK_LEN_MAX]; u8 ptk_name[WPA_PMK_NAME_LEN]; const u8 *mdid = sm->wpa_auth->conf.mobility_domain; const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; const u8 *ssid = sm->wpa_auth->conf.ssid; size_t ssid_len = sm->wpa_auth->conf.ssid_len; int psk_local = sm->wpa_auth->conf.ft_psk_generate_local; int expires_in = sm->wpa_auth->conf.r0_key_lifetime; struct vlan_description vlan; const u8 *identity, *radius_cui; size_t identity_len, radius_cui_len; int session_timeout; const u8 *mpmk; size_t mpmk_len; if (sm->xxkey_len > 0) { mpmk = sm->xxkey; mpmk_len = sm->xxkey_len; } else if (sm->pmksa) { mpmk = sm->pmksa->pmk; mpmk_len = sm->pmksa->pmk_len; } else { wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " "derivation"); return -1; } if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) { wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR, MAC2STR(sm->addr)); return -1; } identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity); radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr, &radius_cui); session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr); if (wpa_derive_pmk_r0(mpmk, mpmk_len, ssid, ssid_len, mdid, r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name, wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) < 0) return -1; if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len, pmk_r0_name, sm->pairwise, &vlan, expires_in, session_timeout, identity, identity_len, radius_cui, radius_cui_len); if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_len, pmk_r0_name, r1kh, sm->addr, pmk_r1, sm->pmk_r1_name) < 0) return -1; if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_len, sm->pmk_r1_name, sm->pairwise, &vlan, expires_in, session_timeout, identity, identity_len, radius_cui, radius_cui_len); return wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce, sm->addr, sm->wpa_auth->addr, sm->pmk_r1_name, ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise, 0); } static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, const u8 *addr, int idx, u8 *seq) { if (wpa_auth->cb->get_seqnum == NULL) return -1; return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq); } static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) { u8 *subelem; struct wpa_auth_config *conf = &sm->wpa_auth->conf; struct wpa_group *gsm = sm->group; size_t subelem_len, pad_len; const u8 *key; size_t key_len; u8 keybuf[WPA_GTK_MAX_LEN]; const u8 *kek; size_t kek_len; if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) { kek = sm->PTK.kek2; kek_len = sm->PTK.kek2_len; } else { kek = sm->PTK.kek; kek_len = sm->PTK.kek_len; } key_len = gsm->GTK_len; if (key_len > sizeof(keybuf)) return NULL; /* * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less * than 16 bytes. */ pad_len = key_len % 8; if (pad_len) pad_len = 8 - pad_len; if (key_len + pad_len < 16) pad_len += 8; if (pad_len && key_len < sizeof(keybuf)) { os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); if (conf->disable_gtk || sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) { /* * Provide unique random GTK to each STA to prevent use * of GTK in the BSS. */ if (random_get_bytes(keybuf, key_len) < 0) return NULL; } os_memset(keybuf + key_len, 0, pad_len); keybuf[key_len] = 0xdd; key_len += pad_len; key = keybuf; } else if (conf->disable_gtk || sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) { /* * Provide unique random GTK to each STA to prevent use of GTK * in the BSS. */ if (random_get_bytes(keybuf, key_len) < 0) return NULL; key = keybuf; } else { key = gsm->GTK[gsm->GN - 1]; } /* * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | * Key[5..32]. */ subelem_len = 13 + key_len + 8; subelem = os_zalloc(subelem_len); if (subelem == NULL) return NULL; subelem[0] = FTIE_SUBELEM_GTK; subelem[1] = 11 + key_len + 8; /* Key ID in B0-B1 of Key Info */ WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); subelem[4] = gsm->GTK_len; wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5); if (aes_wrap(kek, kek_len, key_len / 8, key, subelem + 13)) { wpa_printf(MSG_DEBUG, "FT: GTK subelem encryption failed: kek_len=%d", (int) kek_len); forced_memzero(keybuf, sizeof(keybuf)); os_free(subelem); return NULL; } forced_memzero(keybuf, sizeof(keybuf)); *len = subelem_len; return subelem; } static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) { u8 *subelem, *pos; struct wpa_auth_config *conf = &sm->wpa_auth->conf; struct wpa_group *gsm = sm->group; size_t subelem_len; const u8 *kek, *igtk; size_t kek_len; size_t igtk_len; u8 stub_igtk[WPA_IGTK_MAX_LEN]; if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) { kek = sm->PTK.kek2; kek_len = sm->PTK.kek2_len; } else { kek = sm->PTK.kek; kek_len = sm->PTK.kek_len; } igtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | * Key[16+8] */ subelem_len = 1 + 1 + 2 + 6 + 1 + igtk_len + 8; subelem = os_zalloc(subelem_len); if (subelem == NULL) return NULL; pos = subelem; *pos++ = FTIE_SUBELEM_IGTK; *pos++ = subelem_len - 2; WPA_PUT_LE16(pos, gsm->GN_igtk); pos += 2; wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos); pos += 6; *pos++ = igtk_len; igtk = gsm->IGTK[gsm->GN_igtk - 4]; if (conf->disable_gtk || sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) { /* * Provide unique random IGTK to each STA to prevent use of * IGTK in the BSS. */ if (random_get_bytes(stub_igtk, igtk_len / 8) < 0) { os_free(subelem); return NULL; } igtk = stub_igtk; } if (aes_wrap(kek, kek_len, igtk_len / 8, igtk, pos)) { wpa_printf(MSG_DEBUG, "FT: IGTK subelem encryption failed: kek_len=%d", (int) kek_len); os_free(subelem); return NULL; } *len = subelem_len; return subelem; } static u8 * wpa_ft_bigtk_subelem(struct wpa_state_machine *sm, size_t *len) { u8 *subelem, *pos; struct wpa_group *gsm = sm->group; size_t subelem_len; const u8 *kek, *bigtk; size_t kek_len; size_t bigtk_len; u8 stub_bigtk[WPA_IGTK_MAX_LEN]; if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) { kek = sm->PTK.kek2; kek_len = sm->PTK.kek2_len; } else { kek = sm->PTK.kek; kek_len = sm->PTK.kek_len; } bigtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher); /* Sub-elem ID[1] | Length[1] | KeyID[2] | BIPN[6] | Key Length[1] | * Key[16+8] */ subelem_len = 1 + 1 + 2 + 6 + 1 + bigtk_len + 8; subelem = os_zalloc(subelem_len); if (subelem == NULL) return NULL; pos = subelem; *pos++ = FTIE_SUBELEM_BIGTK; *pos++ = subelem_len - 2; WPA_PUT_LE16(pos, gsm->GN_bigtk); pos += 2; wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_bigtk, pos); pos += 6; *pos++ = bigtk_len; bigtk = gsm->IGTK[gsm->GN_bigtk - 6]; if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) { /* * Provide unique random BIGTK to each OSEN STA to prevent use * of BIGTK in the BSS. */ if (random_get_bytes(stub_bigtk, bigtk_len / 8) < 0) { os_free(subelem); return NULL; } bigtk = stub_bigtk; } if (aes_wrap(kek, kek_len, bigtk_len / 8, bigtk, pos)) { wpa_printf(MSG_DEBUG, "FT: BIGTK subelem encryption failed: kek_len=%d", (int) kek_len); os_free(subelem); return NULL; } *len = subelem_len; return subelem; } static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm, u8 *pos, u8 *end, u8 id, u8 descr_count, const u8 *ies, size_t ies_len) { struct ieee802_11_elems parse; struct rsn_rdie *rdie; wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", id, descr_count); wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", ies, ies_len); if (end - pos < (int) sizeof(*rdie)) { wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); return pos; } *pos++ = WLAN_EID_RIC_DATA; *pos++ = sizeof(*rdie); rdie = (struct rsn_rdie *) pos; rdie->id = id; rdie->descr_count = 0; rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); pos += sizeof(*rdie); if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == ParseFailed) { wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); return pos; } if (parse.wmm_tspec) { struct wmm_tspec_element *tspec; if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " "(%d)", (int) parse.wmm_tspec_len); rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); return pos; } if (end - pos < (int) sizeof(*tspec)) { wpa_printf(MSG_ERROR, "FT: Not enough room for " "response TSPEC"); rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); return pos; } tspec = (struct wmm_tspec_element *) pos; os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); } #ifdef NEED_AP_MLME if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) { int res; res = wmm_process_tspec((struct wmm_tspec_element *) pos); wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) rdie->status_code = host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); else if (res == WMM_ADDTS_STATUS_REFUSED) rdie->status_code = host_to_le16(WLAN_STATUS_REQUEST_DECLINED); else { /* TSPEC accepted; include updated TSPEC in response */ rdie->descr_count = 1; pos += sizeof(struct wmm_tspec_element); } return pos; } #endif /* NEED_AP_MLME */ if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) { int res; res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos, sizeof(struct wmm_tspec_element)); if (res >= 0) { if (res) rdie->status_code = host_to_le16(res); else { /* TSPEC accepted; include updated TSPEC in * response */ rdie->descr_count = 1; pos += sizeof(struct wmm_tspec_element); } return pos; } } wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); return pos; } static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end, const u8 *ric, size_t ric_len) { const u8 *rpos, *start; const struct rsn_rdie *rdie; wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); rpos = ric; while (rpos + sizeof(*rdie) < ric + ric_len) { if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || rpos + 2 + rpos[1] > ric + ric_len) break; rdie = (const struct rsn_rdie *) (rpos + 2); rpos += 2 + rpos[1]; start = rpos; while (rpos + 2 <= ric + ric_len && rpos + 2 + rpos[1] <= ric + ric_len) { if (rpos[0] == WLAN_EID_RIC_DATA) break; rpos += 2 + rpos[1]; } pos = wpa_ft_process_rdie(sm, pos, end, rdie->id, rdie->descr_count, start, rpos - start); } return pos; } u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, size_t max_len, int auth_alg, const u8 *req_ies, size_t req_ies_len, int omit_rsnxe) { u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL; u8 *fte_mic, *elem_count; size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0; u8 rsnxe_buf[10], *rsnxe = rsnxe_buf; size_t rsnxe_len; int rsnxe_used; int res; struct wpa_auth_config *conf; struct wpa_ft_ies parse; u8 *ric_start; u8 *anonce, *snonce; const u8 *kck; size_t kck_len; int use_sha384; if (sm == NULL) return pos; use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt); conf = &sm->wpa_auth->conf; if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt)) return pos; end = pos + max_len; #ifdef CONFIG_TESTING_OPTIONS if (auth_alg == WLAN_AUTH_FT && sm->wpa_auth->conf.rsne_override_ft_set) { wpa_printf(MSG_DEBUG, "TESTING: RSNE FT override for MIC calculation"); rsnie = sm->wpa_auth->conf.rsne_override_ft; rsnie_len = sm->wpa_auth->conf.rsne_override_ft_len; if (end - pos < (long int) rsnie_len) return pos; os_memcpy(pos, rsnie, rsnie_len); rsnie = pos; pos += rsnie_len; if (rsnie_len > PMKID_LEN && sm->pmk_r1_name_valid) { int idx; /* Replace all 0xff PMKID with the valid PMKR1Name */ for (idx = 0; idx < PMKID_LEN; idx++) { if (rsnie[rsnie_len - 1 - idx] != 0xff) break; } if (idx == PMKID_LEN) os_memcpy(&rsnie[rsnie_len - PMKID_LEN], sm->pmk_r1_name, WPA_PMK_NAME_LEN); } } else #endif /* CONFIG_TESTING_OPTIONS */ if (auth_alg == WLAN_AUTH_FT || ((auth_alg == WLAN_AUTH_FILS_SK || auth_alg == WLAN_AUTH_FILS_SK_PFS || auth_alg == WLAN_AUTH_FILS_PK) && (sm->wpa_key_mgmt & (WPA_KEY_MGMT_FT_FILS_SHA256 | WPA_KEY_MGMT_FT_FILS_SHA384)))) { if (!sm->pmk_r1_name_valid) { wpa_printf(MSG_ERROR, "FT: PMKR1Name is not valid for Assoc Resp RSNE"); return NULL; } wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name for Assoc Resp RSNE", sm->pmk_r1_name, WPA_PMK_NAME_LEN); /* * RSN (only present if this is a Reassociation Response and * part of a fast BSS transition; or if this is a * (Re)Association Response frame during an FT initial mobility * domain association using FILS) */ res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); if (res < 0) return NULL; rsnie = pos; rsnie_len = res; pos += res; } /* Mobility Domain Information */ res = wpa_write_mdie(conf, pos, end - pos); if (res < 0) return NULL; mdie = pos; mdie_len = res; pos += res; /* Fast BSS Transition Information */ if (auth_alg == WLAN_AUTH_FT) { subelem = wpa_ft_gtk_subelem(sm, &subelem_len); if (!subelem) { wpa_printf(MSG_DEBUG, "FT: Failed to add GTK subelement"); return NULL; } r0kh_id = sm->r0kh_id; r0kh_id_len = sm->r0kh_id_len; anonce = sm->ANonce; snonce = sm->SNonce; if (sm->mgmt_frame_prot) { u8 *igtk; size_t igtk_len; u8 *nbuf; igtk = wpa_ft_igtk_subelem(sm, &igtk_len); if (igtk == NULL) { wpa_printf(MSG_DEBUG, "FT: Failed to add IGTK subelement"); os_free(subelem); return NULL; } nbuf = os_realloc(subelem, subelem_len + igtk_len); if (nbuf == NULL) { os_free(subelem); os_free(igtk); return NULL; } subelem = nbuf; os_memcpy(subelem + subelem_len, igtk, igtk_len); subelem_len += igtk_len; os_free(igtk); } if (sm->mgmt_frame_prot && conf->beacon_prot) { u8 *bigtk; size_t bigtk_len; u8 *nbuf; bigtk = wpa_ft_bigtk_subelem(sm, &bigtk_len); if (!bigtk) { wpa_printf(MSG_DEBUG, "FT: Failed to add BIGTK subelement"); os_free(subelem); return NULL; } nbuf = os_realloc(subelem, subelem_len + bigtk_len); if (!nbuf) { os_free(subelem); os_free(bigtk); return NULL; } subelem = nbuf; os_memcpy(subelem + subelem_len, bigtk, bigtk_len); subelem_len += bigtk_len; os_free(bigtk); } #ifdef CONFIG_OCV if (wpa_auth_uses_ocv(sm)) { struct wpa_channel_info ci; u8 *nbuf, *ocipos; if (wpa_channel_info(sm->wpa_auth, &ci) != 0) { wpa_printf(MSG_WARNING, "Failed to get channel info for OCI element"); os_free(subelem); return NULL; } #ifdef CONFIG_TESTING_OPTIONS if (conf->oci_freq_override_ft_assoc) { wpa_printf(MSG_INFO, "TEST: Override OCI frequency %d -> %u MHz", ci.frequency, conf->oci_freq_override_ft_assoc); ci.frequency = conf->oci_freq_override_ft_assoc; } #endif /* CONFIG_TESTING_OPTIONS */ subelem_len += 2 + OCV_OCI_LEN; nbuf = os_realloc(subelem, subelem_len); if (!nbuf) { os_free(subelem); return NULL; } subelem = nbuf; ocipos = subelem + subelem_len - 2 - OCV_OCI_LEN; *ocipos++ = FTIE_SUBELEM_OCI; *ocipos++ = OCV_OCI_LEN; if (ocv_insert_oci(&ci, &ocipos) < 0) { os_free(subelem); return NULL; } } #endif /* CONFIG_OCV */ } else { r0kh_id = conf->r0_key_holder; r0kh_id_len = conf->r0_key_holder_len; anonce = NULL; snonce = NULL; } rsnxe_used = (auth_alg == WLAN_AUTH_FT) && (conf->sae_pwe == 1 || conf->sae_pwe == 2); #ifdef CONFIG_TESTING_OPTIONS if (sm->wpa_auth->conf.ft_rsnxe_used) { rsnxe_used = sm->wpa_auth->conf.ft_rsnxe_used == 1; wpa_printf(MSG_DEBUG, "TESTING: FT: Force RSNXE Used %d", rsnxe_used); } #endif /* CONFIG_TESTING_OPTIONS */ res = wpa_write_ftie(conf, use_sha384, r0kh_id, r0kh_id_len, anonce, snonce, pos, end - pos, subelem, subelem_len, rsnxe_used); os_free(subelem); if (res < 0) return NULL; ftie = pos; ftie_len = res; pos += res; if (use_sha384) { struct rsn_ftie_sha384 *_ftie = (struct rsn_ftie_sha384 *) (ftie + 2); fte_mic = _ftie->mic; elem_count = &_ftie->mic_control[1]; } else { struct rsn_ftie *_ftie = (struct rsn_ftie *) (ftie + 2); fte_mic = _ftie->mic; elem_count = &_ftie->mic_control[1]; } if (auth_alg == WLAN_AUTH_FT) *elem_count = 3; /* Information element count */ ric_start = pos; if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse, use_sha384) == 0 && parse.ric) { pos = wpa_ft_process_ric(sm, pos, end, parse.ric, parse.ric_len); if (auth_alg == WLAN_AUTH_FT) *elem_count += ieee802_11_ie_count(ric_start, pos - ric_start); } if (ric_start == pos) ric_start = NULL; if (omit_rsnxe) { rsnxe_len = 0; } else { res = wpa_write_rsnxe(&sm->wpa_auth->conf, rsnxe, sizeof(rsnxe_buf)); if (res < 0) return NULL; rsnxe_len = res; } #ifdef CONFIG_TESTING_OPTIONS if (auth_alg == WLAN_AUTH_FT && sm->wpa_auth->conf.rsnxe_override_ft_set) { wpa_printf(MSG_DEBUG, "TESTING: RSNXE FT override for MIC calculation"); rsnxe = sm->wpa_auth->conf.rsnxe_override_ft; rsnxe_len = sm->wpa_auth->conf.rsnxe_override_ft_len; } #endif /* CONFIG_TESTING_OPTIONS */ if (auth_alg == WLAN_AUTH_FT && rsnxe_len) *elem_count += 1; if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) { kck = sm->PTK.kck2; kck_len = sm->PTK.kck2_len; } else { kck = sm->PTK.kck; kck_len = sm->PTK.kck_len; } if (auth_alg == WLAN_AUTH_FT && wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 6, mdie, mdie_len, ftie, ftie_len, rsnie, rsnie_len, ric_start, ric_start ? pos - ric_start : 0, rsnxe_len ? rsnxe : NULL, rsnxe_len, fte_mic) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); return NULL; } os_free(sm->assoc_resp_ftie); sm->assoc_resp_ftie = os_malloc(ftie_len); if (!sm->assoc_resp_ftie) return NULL; os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len); return pos; } static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, int vlan_id, enum wpa_alg alg, const u8 *addr, int idx, u8 *key, size_t key_len, enum key_flag key_flag) { if (wpa_auth->cb->set_key == NULL) return -1; return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx, key, key_len, key_flag); } static inline int wpa_auth_add_sta_ft(struct wpa_authenticator *wpa_auth, const u8 *addr) { if (!wpa_auth->cb->add_sta_ft) return -1; return wpa_auth->cb->add_sta_ft(wpa_auth->cb_ctx, addr); } void wpa_ft_install_ptk(struct wpa_state_machine *sm, int retry) { enum wpa_alg alg; int klen; /* MLME-SETKEYS.request(PTK) */ alg = wpa_cipher_to_alg(sm->pairwise); klen = wpa_cipher_key_len(sm->pairwise); if (!wpa_cipher_valid_pairwise(sm->pairwise)) { wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip " "PTK configuration", sm->pairwise); return; } if (sm->tk_already_set) { /* Must avoid TK reconfiguration to prevent clearing of TX/RX * PN in the driver */ wpa_printf(MSG_DEBUG, "FT: Do not re-install same PTK to the driver"); return; } if (!retry) wpa_auth_add_sta_ft(sm->wpa_auth, sm->addr); /* FIX: add STA entry to kernel/driver here? The set_key will fail * most likely without this.. At the moment, STA entry is added only * after association has been completed. This function will be called * again after association to get the PTK configured, but that could be * optimized by adding the STA entry earlier. */ if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, sm->keyidx_active, sm->PTK.tk, klen, KEY_FLAG_PAIRWISE_RX_TX)) return; /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ sm->pairwise_set = true; sm->tk_already_set = true; } /* Derive PMK-R1 from PSK, check all available PSK */ static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm, const u8 *req_pmk_r1_name, u8 *out_pmk_r1, int *out_pairwise, struct vlan_description *out_vlan, const u8 **out_identity, size_t *out_identity_len, const u8 **out_radius_cui, size_t *out_radius_cui_len, int *out_session_timeout) { const u8 *pmk = NULL; u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; struct wpa_authenticator *wpa_auth = sm->wpa_auth; const u8 *mdid = wpa_auth->conf.mobility_domain; const u8 *r0kh = sm->r0kh_id; size_t r0kh_len = sm->r0kh_id_len; const u8 *r1kh = wpa_auth->conf.r1_key_holder; const u8 *ssid = wpa_auth->conf.ssid; size_t ssid_len = wpa_auth->conf.ssid_len; int pairwise; pairwise = sm->pairwise; for (;;) { pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr, pmk); if (pmk == NULL) break; if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name, 0) < 0 || wpa_derive_pmk_r1(pmk_r0, PMK_LEN, pmk_r0_name, r1kh, sm->addr, pmk_r1, pmk_r1_name) < 0 || os_memcmp_const(pmk_r1_name, req_pmk_r1_name, WPA_PMK_NAME_LEN) != 0) continue; /* We found a PSK that matches the requested pmk_r1_name */ wpa_printf(MSG_DEBUG, "FT: Found PSK to generate PMK-R1 locally"); os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN); if (out_pairwise) *out_pairwise = pairwise; os_memcpy(sm->PMK, pmk, PMK_LEN); sm->pmk_len = PMK_LEN; if (out_vlan && wpa_ft_get_vlan(sm->wpa_auth, sm->addr, out_vlan) < 0) { wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR, MAC2STR(sm->addr)); return -1; } if (out_identity && out_identity_len) { *out_identity_len = wpa_ft_get_identity( sm->wpa_auth, sm->addr, out_identity); } if (out_radius_cui && out_radius_cui_len) { *out_radius_cui_len = wpa_ft_get_radius_cui( sm->wpa_auth, sm->addr, out_radius_cui); } if (out_session_timeout) { *out_session_timeout = wpa_ft_get_session_timeout( sm->wpa_auth, sm->addr); } return 0; } wpa_printf(MSG_DEBUG, "FT: Did not find PSK to generate PMK-R1 locally"); return -1; } /* Detect the configuration the station asked for. * Required to detect FT-PSK and pairwise cipher. */ static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm, struct wpa_ft_ies *parse) { int key_mgmt, ciphers; if (sm->wpa_key_mgmt) return 0; key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt; if (!key_mgmt) { wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from " MACSTR, parse->key_mgmt, MAC2STR(sm->addr)); return -1; } if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X) sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X; #ifdef CONFIG_SHA384 else if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X_SHA384) sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X_SHA384; #endif /* CONFIG_SHA384 */ else if (key_mgmt & WPA_KEY_MGMT_FT_PSK) sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK; #ifdef CONFIG_FILS else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256) sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256; else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384) sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384; #endif /* CONFIG_FILS */ ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise; if (!ciphers) { wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from " MACSTR, parse->pairwise_cipher, MAC2STR(sm->addr)); return -1; } sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0); return 0; } static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth, struct wpa_state_machine *sm, const u8 *r0kh_id, size_t r0kh_id_len, const u8 *req_pmk_r0_name, const u8 *req_pmk_r1_name, u8 *out_pmk_r1, int *out_pairwise, struct vlan_description *vlan, const u8 **identity, size_t *identity_len, const u8 **radius_cui, size_t *radius_cui_len, int *out_session_timeout) { struct wpa_auth_config *conf = &wpa_auth->conf; const struct wpa_ft_pmk_r0_sa *r0; u8 pmk_r1_name[WPA_PMK_NAME_LEN]; int expires_in = 0; int session_timeout = 0; struct os_reltime now; if (conf->r0_key_holder_len != r0kh_id_len || os_memcmp(conf->r0_key_holder, r0kh_id, conf->r0_key_holder_len) != 0) return -1; /* not our R0KH-ID */ wpa_printf(MSG_DEBUG, "FT: STA R0KH-ID matching local configuration"); if (wpa_ft_fetch_pmk_r0(sm->wpa_auth, sm->addr, req_pmk_r0_name, &r0) < 0) return -1; /* no matching PMKR0Name in local cache */ wpa_printf(MSG_DEBUG, "FT: Requested PMKR0Name found in local cache"); if (wpa_derive_pmk_r1(r0->pmk_r0, r0->pmk_r0_len, r0->pmk_r0_name, conf->r1_key_holder, sm->addr, out_pmk_r1, pmk_r1_name) < 0) return -1; os_get_reltime(&now); if (r0->expiration) expires_in = r0->expiration - now.sec; if (r0->session_timeout) session_timeout = r0->session_timeout - now.sec; wpa_ft_store_pmk_r1(wpa_auth, sm->addr, out_pmk_r1, r0->pmk_r0_len, pmk_r1_name, sm->pairwise, r0->vlan, expires_in, session_timeout, r0->identity, r0->identity_len, r0->radius_cui, r0->radius_cui_len); *out_pairwise = sm->pairwise; if (vlan) { if (r0->vlan) *vlan = *r0->vlan; else os_memset(vlan, 0, sizeof(*vlan)); } if (identity && identity_len) { *identity = r0->identity; *identity_len = r0->identity_len; } if (radius_cui && radius_cui_len) { *radius_cui = r0->radius_cui; *radius_cui_len = r0->radius_cui_len; } *out_session_timeout = session_timeout; return 0; } static int wpa_ft_process_auth_req(struct wpa_state_machine *sm, const u8 *ies, size_t ies_len, u8 **resp_ies, size_t *resp_ies_len) { struct rsn_mdie *mdie; u8 pmk_r1[PMK_LEN_MAX], pmk_r1_name[WPA_PMK_NAME_LEN]; u8 ptk_name[WPA_PMK_NAME_LEN]; struct wpa_auth_config *conf; struct wpa_ft_ies parse; size_t buflen; int ret; u8 *pos, *end; int pairwise, session_timeout = 0; struct vlan_description vlan; const u8 *identity, *radius_cui; size_t identity_len = 0, radius_cui_len = 0; int use_sha384; size_t pmk_r1_len, kdk_len; *resp_ies = NULL; *resp_ies_len = 0; sm->pmk_r1_name_valid = 0; conf = &sm->wpa_auth->conf; wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", ies, ies_len); if (wpa_ft_parse_ies(ies, ies_len, &parse, -1)) { wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } use_sha384 = wpa_key_mgmt_sha384(parse.key_mgmt); pmk_r1_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN; mdie = (struct rsn_mdie *) parse.mdie; if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || os_memcmp(mdie->mobility_domain, sm->wpa_auth->conf.mobility_domain, MOBILITY_DOMAIN_ID_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); return WLAN_STATUS_INVALID_MDIE; } if (use_sha384) { struct rsn_ftie_sha384 *ftie; ftie = (struct rsn_ftie_sha384 *) parse.ftie; if (!ftie || parse.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); return WLAN_STATUS_INVALID_FTIE; } os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); } else { struct rsn_ftie *ftie; ftie = (struct rsn_ftie *) parse.ftie; if (!ftie || parse.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); return WLAN_STATUS_INVALID_FTIE; } os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); } if (parse.r0kh_id == NULL) { wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); return WLAN_STATUS_INVALID_FTIE; } wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", parse.r0kh_id, parse.r0kh_id_len); os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); sm->r0kh_id_len = parse.r0kh_id_len; if (parse.rsn_pmkid == NULL) { wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); return WLAN_STATUS_INVALID_PMKID; } if (wpa_ft_set_key_mgmt(sm, &parse) < 0) return WLAN_STATUS_UNSPECIFIED_FAILURE; wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", parse.rsn_pmkid, WPA_PMK_NAME_LEN); if (wpa_derive_pmk_r1_name(parse.rsn_pmkid, sm->wpa_auth->conf.r1_key_holder, sm->addr, pmk_r1_name, use_sha384) < 0) return WLAN_STATUS_UNSPECIFIED_FAILURE; if (conf->ft_psk_generate_local && wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) { if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise, &vlan, &identity, &identity_len, &radius_cui, &radius_cui_len, &session_timeout) < 0) return WLAN_STATUS_INVALID_PMKID; wpa_printf(MSG_DEBUG, "FT: Generated PMK-R1 for FT-PSK locally"); } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1, &pmk_r1_len, &pairwise, &vlan, &identity, &identity_len, &radius_cui, &radius_cui_len, &session_timeout) < 0) { wpa_printf(MSG_DEBUG, "FT: No PMK-R1 available in local cache for the requested PMKR1Name"); if (wpa_ft_local_derive_pmk_r1(sm->wpa_auth, sm, parse.r0kh_id, parse.r0kh_id_len, parse.rsn_pmkid, pmk_r1_name, pmk_r1, &pairwise, &vlan, &identity, &identity_len, &radius_cui, &radius_cui_len, &session_timeout) == 0) { wpa_printf(MSG_DEBUG, "FT: Generated PMK-R1 based on local PMK-R0"); goto pmk_r1_derived; } if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) { wpa_printf(MSG_DEBUG, "FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH"); return WLAN_STATUS_INVALID_PMKID; } return -1; /* Status pending */ } else { wpa_printf(MSG_DEBUG, "FT: Found PMKR1Name from local cache"); } pmk_r1_derived: wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, pmk_r1_len); sm->pmk_r1_name_valid = 1; os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); os_memcpy(sm->pmk_r1, pmk_r1, pmk_r1_len); sm->pmk_r1_len = pmk_r1_len; if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " "ANonce"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", sm->SNonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", sm->ANonce, WPA_NONCE_LEN); if (sm->wpa_auth->conf.force_kdk_derivation || (sm->wpa_auth->conf.secure_ltf && ieee802_11_rsnx_capab(sm->rsnxe, WLAN_RSNX_CAPAB_SECURE_LTF))) kdk_len = WPA_KDK_MAX_LEN; else kdk_len = 0; if (wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce, sm->addr, sm->wpa_auth->addr, pmk_r1_name, &sm->PTK, ptk_name, sm->wpa_key_mgmt, pairwise, kdk_len) < 0) return WLAN_STATUS_UNSPECIFIED_FAILURE; sm->pairwise = pairwise; sm->PTK_valid = true; sm->tk_already_set = false; wpa_ft_install_ptk(sm, 0); if (wpa_ft_set_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to configure VLAN"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } if (wpa_ft_set_identity(sm->wpa_auth, sm->addr, identity, identity_len) < 0 || wpa_ft_set_radius_cui(sm->wpa_auth, sm->addr, radius_cui, radius_cui_len) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to configure identity/CUI"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } wpa_ft_set_session_timeout(sm->wpa_auth, sm->addr, session_timeout); buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 2 + FT_R1KH_ID_LEN + 200; *resp_ies = os_zalloc(buflen); if (*resp_ies == NULL) goto fail; pos = *resp_ies; end = *resp_ies + buflen; ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); if (ret < 0) goto fail; pos += ret; ret = wpa_write_mdie(conf, pos, end - pos); if (ret < 0) goto fail; pos += ret; ret = wpa_write_ftie(conf, use_sha384, parse.r0kh_id, parse.r0kh_id_len, sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0, 0); if (ret < 0) goto fail; pos += ret; *resp_ies_len = pos - *resp_ies; return WLAN_STATUS_SUCCESS; fail: os_free(*resp_ies); *resp_ies = NULL; return WLAN_STATUS_UNSPECIFIED_FAILURE; } void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, u16 auth_transaction, const u8 *ies, size_t ies_len, void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, u16 auth_transaction, u16 status, const u8 *ies, size_t ies_len), void *ctx) { u16 status; u8 *resp_ies; size_t resp_ies_len; int res; if (sm == NULL) { wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " "WPA SM not available"); return; } wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR " BSSID=" MACSTR " transaction=%d", MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); sm->ft_pending_cb = cb; sm->ft_pending_cb_ctx = ctx; sm->ft_pending_auth_transaction = auth_transaction; sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries; res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, &resp_ies_len); if (res < 0) { wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); return; } status = res; wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR " auth_transaction=%d status=%u (%s)", MAC2STR(sm->addr), auth_transaction + 1, status, status2str(status)); wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); cb(ctx, sm->addr, bssid, auth_transaction + 1, status, resp_ies, resp_ies_len); os_free(resp_ies); } int wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, size_t ies_len) { struct wpa_ft_ies parse; struct rsn_mdie *mdie; u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; size_t mic_len = 16; unsigned int count; const u8 *kck; size_t kck_len; int use_sha384; const u8 *anonce, *snonce, *fte_mic; u8 fte_elem_count; int rsnxe_used; struct wpa_auth_config *conf; if (sm == NULL) return WLAN_STATUS_UNSPECIFIED_FAILURE; conf = &sm->wpa_auth->conf; use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt); wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } if (parse.rsn == NULL) { wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } if (parse.rsn_pmkid == NULL) { wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); return WLAN_STATUS_INVALID_PMKID; } if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " "with the PMKR1Name derived from auth request"); return WLAN_STATUS_INVALID_PMKID; } mdie = (struct rsn_mdie *) parse.mdie; if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || os_memcmp(mdie->mobility_domain, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); return WLAN_STATUS_INVALID_MDIE; } if (use_sha384) { struct rsn_ftie_sha384 *ftie; ftie = (struct rsn_ftie_sha384 *) parse.ftie; if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); return WLAN_STATUS_INVALID_FTIE; } anonce = ftie->anonce; snonce = ftie->snonce; rsnxe_used = ftie->mic_control[0] & 0x01; fte_elem_count = ftie->mic_control[1]; fte_mic = ftie->mic; } else { struct rsn_ftie *ftie; ftie = (struct rsn_ftie *) parse.ftie; if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); return WLAN_STATUS_INVALID_FTIE; } anonce = ftie->anonce; snonce = ftie->snonce; rsnxe_used = ftie->mic_control[0] & 0x01; fte_elem_count = ftie->mic_control[1]; fte_mic = ftie->mic; } if (os_memcmp(snonce, sm->SNonce, WPA_NONCE_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", snonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", sm->SNonce, WPA_NONCE_LEN); return WLAN_STATUS_INVALID_FTIE; } if (os_memcmp(anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", anonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", sm->ANonce, WPA_NONCE_LEN); return WLAN_STATUS_INVALID_FTIE; } if (parse.r0kh_id == NULL) { wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); return WLAN_STATUS_INVALID_FTIE; } if (parse.r0kh_id_len != sm->r0kh_id_len || os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " "the current R0KH-ID"); wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", parse.r0kh_id, parse.r0kh_id_len); wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", sm->r0kh_id, sm->r0kh_id_len); return WLAN_STATUS_INVALID_FTIE; } if (parse.r1kh_id == NULL) { wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); return WLAN_STATUS_INVALID_FTIE; } if (os_memcmp_const(parse.r1kh_id, conf->r1_key_holder, FT_R1KH_ID_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " "ReassocReq"); wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE", parse.r1kh_id, FT_R1KH_ID_LEN); wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID", conf->r1_key_holder, FT_R1KH_ID_LEN); return WLAN_STATUS_INVALID_FTIE; } if (parse.rsn_pmkid == NULL || os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); return WLAN_STATUS_INVALID_PMKID; } count = 3; if (parse.ric) count += ieee802_11_ie_count(parse.ric, parse.ric_len); if (parse.rsnxe) count++; if (fte_elem_count != count) { wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " "Control: received %u expected %u", fte_elem_count, count); return WLAN_STATUS_UNSPECIFIED_FAILURE; } if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) { kck = sm->PTK.kck2; kck_len = sm->PTK.kck2_len; } else { kck = sm->PTK.kck; kck_len = sm->PTK.kck_len; } if (wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 5, parse.mdie - 2, parse.mdie_len + 2, parse.ftie - 2, parse.ftie_len + 2, parse.rsn - 2, parse.rsn_len + 2, parse.ric, parse.ric_len, parse.rsnxe ? parse.rsnxe - 2 : NULL, parse.rsnxe ? parse.rsnxe_len + 2 : 0, mic) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } if (os_memcmp_const(mic, fte_mic, mic_len) != 0) { wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", fte_mic, mic_len); wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len); wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", parse.mdie - 2, parse.mdie_len + 2); wpa_hexdump(MSG_MSGDUMP, "FT: FTIE", parse.ftie - 2, parse.ftie_len + 2); wpa_hexdump(MSG_MSGDUMP, "FT: RSN", parse.rsn - 2, parse.rsn_len + 2); wpa_hexdump(MSG_MSGDUMP, "FT: RSNXE", parse.rsnxe ? parse.rsnxe - 2 : NULL, parse.rsnxe ? parse.rsnxe_len + 2 : 0); return WLAN_STATUS_INVALID_FTIE; } if (rsnxe_used && (conf->sae_pwe == 1 || conf->sae_pwe == 2) && !parse.rsnxe) { wpa_printf(MSG_INFO, "FT: FTE indicated that STA uses RSNXE, but RSNXE was not included"); return -1; /* discard request */ } #ifdef CONFIG_OCV if (wpa_auth_uses_ocv(sm)) { struct wpa_channel_info ci; int tx_chanwidth; int tx_seg1_idx; enum oci_verify_result res; if (wpa_channel_info(sm->wpa_auth, &ci) != 0) { wpa_printf(MSG_WARNING, "Failed to get channel info to validate received OCI in (Re)Assoc Request"); return WLAN_STATUS_UNSPECIFIED_FAILURE; } if (get_sta_tx_parameters(sm, channel_width_to_int(ci.chanwidth), ci.seg1_idx, &tx_chanwidth, &tx_seg1_idx) < 0) return WLAN_STATUS_UNSPECIFIED_FAILURE; res = ocv_verify_tx_params(parse.oci, parse.oci_len, &ci, tx_chanwidth, tx_seg1_idx); if (wpa_auth_uses_ocv(sm) == 2 && res == OCI_NOT_FOUND) { /* Work around misbehaving STAs */ wpa_printf(MSG_INFO, "Disable OCV with a STA that does not send OCI"); wpa_auth_set_ocv(sm, 0); } else if (res != OCI_SUCCESS) { wpa_printf(MSG_WARNING, "OCV failed: %s", ocv_errorstr); if (sm->wpa_auth->conf.msg_ctx) wpa_msg(sm->wpa_auth->conf.msg_ctx, MSG_INFO, OCV_FAILURE "addr=" MACSTR " frame=ft-reassoc-req error=%s", MAC2STR(sm->addr), ocv_errorstr); return WLAN_STATUS_INVALID_FTIE; } } #endif /* CONFIG_OCV */ return WLAN_STATUS_SUCCESS; } int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) { const u8 *sta_addr, *target_ap; const u8 *ies; size_t ies_len; u8 action; struct ft_rrb_frame *frame; if (sm == NULL) return -1; /* * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] * FT Request action frame body[variable] */ if (len < 14) { wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " "(len=%lu)", (unsigned long) len); return -1; } action = data[1]; sta_addr = data + 2; target_ap = data + 8; ies = data + 14; ies_len = len - 14; wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR " Target AP=" MACSTR " Action=%d)", MAC2STR(sta_addr), MAC2STR(target_ap), action); if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " "STA=" MACSTR " STA-Address=" MACSTR, MAC2STR(sm->addr), MAC2STR(sta_addr)); return -1; } /* * Do some validity checking on the target AP address (not own and not * broadcast. This could be extended to filter based on a list of known * APs in the MD (if such a list were configured). */ if ((target_ap[0] & 0x01) || os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " "frame"); return -1; } wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); if (!sm->wpa_auth->conf.ft_over_ds) { wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject"); return -1; } /* RRB - Forward action frame to the target AP */ frame = os_malloc(sizeof(*frame) + len); if (frame == NULL) return -1; frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; frame->packet_type = FT_PACKET_REQUEST; frame->action_length = host_to_le16(len); os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); os_memcpy(frame + 1, data, len); wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, sizeof(*frame) + len); os_free(frame); return 0; } static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid, u16 auth_transaction, u16 resp, const u8 *ies, size_t ies_len) { struct wpa_state_machine *sm = ctx; wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR, MAC2STR(sm->addr)); wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr, WLAN_STATUS_SUCCESS, ies, ies_len); } static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, const u8 *current_ap, const u8 *sta_addr, const u8 *body, size_t len) { struct wpa_state_machine *sm; u16 status; u8 *resp_ies; size_t resp_ies_len; int res; sm = wpa_ft_add_sta(wpa_auth, sta_addr); if (sm == NULL) { wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " "RRB Request"); return -1; } wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb; sm->ft_pending_cb_ctx = sm; os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN); sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries; res = wpa_ft_process_auth_req(sm, body, len, &resp_ies, &resp_ies_len); if (res < 0) { wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response"); return 0; } status = res; res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status, resp_ies, resp_ies_len); os_free(resp_ies); return res; } static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm, const u8 *current_ap, const u8 *sta_addr, u16 status, const u8 *resp_ies, size_t resp_ies_len) { struct wpa_authenticator *wpa_auth = sm->wpa_auth; size_t rlen; struct ft_rrb_frame *frame; u8 *pos; wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR " CurrentAP=" MACSTR " status=%u (%s)", MAC2STR(sm->addr), MAC2STR(current_ap), status, status2str(status)); wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); /* RRB - Forward action frame response to the Current AP */ /* * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] * Status_Code[2] FT Request action frame body[variable] */ rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; frame = os_malloc(sizeof(*frame) + rlen); if (frame == NULL) return -1; frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; frame->packet_type = FT_PACKET_RESPONSE; frame->action_length = host_to_le16(rlen); os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); pos = (u8 *) (frame + 1); *pos++ = WLAN_ACTION_FT; *pos++ = 2; /* Action: Response */ os_memcpy(pos, sta_addr, ETH_ALEN); pos += ETH_ALEN; os_memcpy(pos, wpa_auth->addr, ETH_ALEN); pos += ETH_ALEN; WPA_PUT_LE16(pos, status); pos += 2; if (resp_ies) os_memcpy(pos, resp_ies, resp_ies_len); wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, sizeof(*frame) + rlen); os_free(frame); return 0; } static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len, const struct tlv_list *tlvs, const struct wpa_ft_pmk_r0_sa *pmk_r0, const u8 *r1kh_id, const u8 *s1kh_id, const struct tlv_list *tlv_auth, const u8 *src_addr, u8 type, u8 **packet, size_t *packet_len) { u8 pmk_r1[PMK_LEN_MAX]; size_t pmk_r1_len = pmk_r0->pmk_r0_len; u8 pmk_r1_name[WPA_PMK_NAME_LEN]; u8 f_pairwise[sizeof(le16)]; u8 f_expires_in[sizeof(le16)]; u8 f_session_timeout[sizeof(le32)]; int expires_in; int session_timeout; struct os_reltime now; int ret; struct tlv_list sess_tlv[] = { { .type = FT_RRB_PMK_R1, .len = pmk_r1_len, .data = pmk_r1 }, { .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name), .data = pmk_r1_name }, { .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise), .data = f_pairwise }, { .type = FT_RRB_EXPIRES_IN, .len = sizeof(f_expires_in), .data = f_expires_in }, { .type = FT_RRB_IDENTITY, .len = pmk_r0->identity_len, .data = pmk_r0->identity }, { .type = FT_RRB_RADIUS_CUI, .len = pmk_r0->radius_cui_len, .data = pmk_r0->radius_cui }, { .type = FT_RRB_SESSION_TIMEOUT, .len = sizeof(f_session_timeout), .data = f_session_timeout }, { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL }, }; wpa_printf(MSG_DEBUG, "FT: Derive PMK-R1 for peer AP"); if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_len, pmk_r0->pmk_r0_name, r1kh_id, s1kh_id, pmk_r1, pmk_r1_name) < 0) return -1; WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise); os_get_reltime(&now); if (pmk_r0->expiration > now.sec) expires_in = pmk_r0->expiration - now.sec; else if (pmk_r0->expiration) expires_in = 1; else expires_in = 0; WPA_PUT_LE16(f_expires_in, expires_in); if (pmk_r0->session_timeout > now.sec) session_timeout = pmk_r0->session_timeout - now.sec; else if (pmk_r0->session_timeout) session_timeout = 1; else session_timeout = 0; WPA_PUT_LE32(f_session_timeout, session_timeout); ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth, pmk_r0->vlan, src_addr, type, packet, packet_len); forced_memzero(pmk_r1, sizeof(pmk_r1)); return ret; } static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer) { const char *msgtype = "pull request"; u8 *plain = NULL, *packet = NULL; size_t plain_len = 0, packet_len = 0; struct ft_remote_r1kh *r1kh, *r1kh_wildcard; const u8 *key; size_t key_len; int seq_ret; const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name; size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len; size_t f_pmk_r0_name_len; const struct wpa_ft_pmk_r0_sa *r0; int ret; struct tlv_list resp[2]; struct tlv_list resp_auth[5]; struct ft_rrb_seq f_seq; wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1); wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len); if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) { wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch"); goto out; } RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN); wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id)); wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard); if (r1kh) { key = r1kh->key; key_len = sizeof(r1kh->key); } else if (r1kh_wildcard) { wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID"); key = r1kh_wildcard->key; key_len = sizeof(r1kh_wildcard->key); } else { goto out; } RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len); seq_ret = FT_RRB_SEQ_DROP; if (r1kh) seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len, auth, auth_len, msgtype, no_defer); if (!no_defer && r1kh_wildcard && (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) { /* wildcard: r1kh-id unknown or changed addr -> do a seq req */ seq_ret = FT_RRB_SEQ_DEFER; } if (seq_ret == FT_RRB_SEQ_DROP) goto out; if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len, src_addr, FT_PACKET_R0KH_R1KH_PULL, &plain, &plain_len) < 0) goto out; if (!r1kh) r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr, f_r1kh_id, wpa_auth->conf.rkh_pos_timeout); if (!r1kh) goto out; if (seq_ret == FT_RRB_SEQ_DEFER) { wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id, f_r0kh_id_len, f_r1kh_id, key, key_len, enc, enc_len, auth, auth_len, &wpa_ft_rrb_rx_pull); goto out; } wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len, msgtype); wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, wpa_auth->conf.rkh_pos_timeout); RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN); wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name, f_pmk_r0_name_len); RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN); wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id)); if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to get seq num"); goto out; } wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull response from " MACSTR " to " MACSTR, MAC2STR(wpa_auth->addr), MAC2STR(src_addr)); resp[0].type = FT_RRB_S1KH_ID; resp[0].len = f_s1kh_id_len; resp[0].data = f_s1kh_id; resp[1].type = FT_RRB_LAST_EMPTY; resp[1].len = 0; resp[1].data = NULL; resp_auth[0].type = FT_RRB_NONCE; resp_auth[0].len = f_nonce_len; resp_auth[0].data = f_nonce; resp_auth[1].type = FT_RRB_SEQ; resp_auth[1].len = sizeof(f_seq); resp_auth[1].data = (u8 *) &f_seq; resp_auth[2].type = FT_RRB_R0KH_ID; resp_auth[2].len = f_r0kh_id_len; resp_auth[2].data = f_r0kh_id; resp_auth[3].type = FT_RRB_R1KH_ID; resp_auth[3].len = f_r1kh_id_len; resp_auth[3].data = f_r1kh_id; resp_auth[4].type = FT_RRB_LAST_EMPTY; resp_auth[4].len = 0; resp_auth[4].data = NULL; if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0) { wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found"); ret = wpa_ft_rrb_build(key, key_len, resp, NULL, resp_auth, NULL, wpa_auth->addr, FT_PACKET_R0KH_R1KH_RESP, &packet, &packet_len); } else { ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id, f_s1kh_id, resp_auth, wpa_auth->addr, FT_PACKET_R0KH_R1KH_RESP, &packet, &packet_len); } if (!ret) wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP, packet, packet_len); out: os_free(plain); os_free(packet); return 0; } /* @returns 0 on success * -1 on error * -2 if FR_RRB_PAIRWISE is missing */ static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth, const u8 *src_addr, u8 type, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, const char *msgtype, u8 *s1kh_id_out, int (*cb)(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer)) { u8 *plain = NULL; size_t plain_len = 0; struct ft_remote_r0kh *r0kh, *r0kh_wildcard; const u8 *key; size_t key_len; int seq_ret; const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id; const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1; const u8 *f_expires_in; size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len; const u8 *f_identity, *f_radius_cui; const u8 *f_session_timeout; size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len; size_t f_expires_in_len; size_t f_identity_len, f_radius_cui_len; size_t f_session_timeout_len; int pairwise; int ret = -1; int expires_in; int session_timeout; struct vlan_description vlan; size_t pmk_r1_len; RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1); wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len); RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN); wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id)); if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) { wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch"); goto out; } wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh, &r0kh_wildcard); if (r0kh) { key = r0kh->key; key_len = sizeof(r0kh->key); } else if (r0kh_wildcard) { wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID"); key = r0kh_wildcard->key; key_len = sizeof(r0kh_wildcard->key); } else { goto out; } seq_ret = FT_RRB_SEQ_DROP; if (r0kh) { seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len, auth, auth_len, msgtype, cb ? 0 : 1); } if (cb && r0kh_wildcard && (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) { /* wildcard: r0kh-id unknown or changed addr -> do a seq req */ seq_ret = FT_RRB_SEQ_DEFER; } if (seq_ret == FT_RRB_SEQ_DROP) goto out; if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len, src_addr, type, &plain, &plain_len) < 0) goto out; if (!r0kh) r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr, f_r0kh_id, f_r0kh_id_len, wpa_auth->conf.rkh_pos_timeout); if (!r0kh) goto out; if (seq_ret == FT_RRB_SEQ_DEFER) { wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id, f_r0kh_id_len, f_r1kh_id, key, key_len, enc, enc_len, auth, auth_len, cb); goto out; } wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len, msgtype); wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, wpa_auth->conf.rkh_pos_timeout); RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN); wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id)); if (s1kh_id_out) os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN); ret = -2; RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16)); wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len); ret = -1; RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN); wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f_pmk_r1_name, WPA_PMK_NAME_LEN); pmk_r1_len = PMK_LEN; if (wpa_ft_rrb_get_tlv(plain, plain_len, FT_RRB_PMK_R1, &f_pmk_r1_len, &f_pmk_r1) == 0 && (f_pmk_r1_len == PMK_LEN || f_pmk_r1_len == SHA384_MAC_LEN)) pmk_r1_len = f_pmk_r1_len; RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, pmk_r1_len); wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, pmk_r1_len); pairwise = WPA_GET_LE16(f_pairwise); RRB_GET_OPTIONAL(FT_RRB_EXPIRES_IN, expires_in, msgtype, sizeof(le16)); if (f_expires_in) expires_in = WPA_GET_LE16(f_expires_in); else expires_in = 0; wpa_printf(MSG_DEBUG, "FT: PMK-R1 %s - expires_in=%d", msgtype, expires_in); if (wpa_ft_rrb_get_tlv_vlan(plain, plain_len, &vlan) < 0) { wpa_printf(MSG_DEBUG, "FT: Cannot parse vlan"); wpa_ft_rrb_dump(plain, plain_len); goto out; } wpa_printf(MSG_DEBUG, "FT: vlan %d%s", le_to_host16(vlan.untagged), vlan.tagged[0] ? "+" : ""); RRB_GET_OPTIONAL(FT_RRB_IDENTITY, identity, msgtype, -1); if (f_identity) wpa_hexdump_ascii(MSG_DEBUG, "FT: Identity", f_identity, f_identity_len); RRB_GET_OPTIONAL(FT_RRB_RADIUS_CUI, radius_cui, msgtype, -1); if (f_radius_cui) wpa_hexdump_ascii(MSG_DEBUG, "FT: CUI", f_radius_cui, f_radius_cui_len); RRB_GET_OPTIONAL(FT_RRB_SESSION_TIMEOUT, session_timeout, msgtype, sizeof(le32)); if (f_session_timeout) session_timeout = WPA_GET_LE32(f_session_timeout); else session_timeout = 0; wpa_printf(MSG_DEBUG, "FT: session_timeout %d", session_timeout); if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, pmk_r1_len, f_pmk_r1_name, pairwise, &vlan, expires_in, session_timeout, f_identity, f_identity_len, f_radius_cui, f_radius_cui_len) < 0) goto out; ret = 0; out: bin_clear_free(plain, plain_len); return ret; } static void ft_finish_pull(struct wpa_state_machine *sm) { int res; u8 *resp_ies; size_t resp_ies_len; u16 status; if (!sm->ft_pending_cb || !sm->ft_pending_req_ies) return; res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies), wpabuf_len(sm->ft_pending_req_ies), &resp_ies, &resp_ies_len); if (res < 0) { /* this loop is broken by ft_pending_pull_left_retries */ wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available"); return; } wpabuf_free(sm->ft_pending_req_ies); sm->ft_pending_req_ies = NULL; status = res; wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR " - status %u", MAC2STR(sm->addr), status); sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr, sm->ft_pending_auth_transaction + 1, status, resp_ies, resp_ies_len); os_free(resp_ies); } struct ft_get_sta_ctx { const u8 *nonce; const u8 *s1kh_id; struct wpa_state_machine *sm; }; static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx) { struct ft_get_sta_ctx *info = ctx; if ((info->s1kh_id && os_memcmp(info->s1kh_id, sm->addr, ETH_ALEN) != 0) || os_memcmp(info->nonce, sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) != 0 || sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL) return 0; info->sm = sm; return 1; } static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer) { const char *msgtype = "pull response"; int nak, ret = -1; struct ft_get_sta_ctx ctx; u8 s1kh_id[ETH_ALEN]; const u8 *f_nonce; size_t f_nonce_len; wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len); os_memset(&ctx, 0, sizeof(ctx)); ctx.nonce = f_nonce; if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) { /* nonce not found */ wpa_printf(MSG_DEBUG, "FT: Invalid nonce"); return -1; } ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP, enc, enc_len, auth, auth_len, msgtype, s1kh_id, no_defer ? NULL : &wpa_ft_rrb_rx_resp); if (ret == -2) { ret = 0; nak = 1; } else { nak = 0; } if (ret < 0) return -1; ctx.s1kh_id = s1kh_id; if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) { wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for " MACSTR, MAC2STR(ctx.sm->addr)); eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL); if (nak) ctx.sm->ft_pending_pull_left_retries = 0; ft_finish_pull(ctx.sm); } out: return ret; } static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer) { const char *msgtype = "push"; wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH, enc, enc_len, auth, auth_len, msgtype, NULL, no_defer ? NULL : wpa_ft_rrb_rx_push) < 0) return -1; return 0; } static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth, const u8 *src_addr, int type, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, struct ft_remote_seq **rkh_seq, u8 **key, size_t *key_len, struct ft_remote_r0kh **r0kh_out, struct ft_remote_r1kh **r1kh_out, struct ft_remote_r0kh **r0kh_wildcard_out, struct ft_remote_r1kh **r1kh_wildcard_out) { struct ft_remote_r0kh *r0kh = NULL; struct ft_remote_r1kh *r1kh = NULL; const u8 *f_r0kh_id, *f_r1kh_id; size_t f_r0kh_id_len, f_r1kh_id_len; int to_r0kh, to_r1kh; u8 *plain = NULL; size_t plain_len = 0; struct ft_remote_r0kh *r0kh_wildcard; struct ft_remote_r1kh *r1kh_wildcard; RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1); RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN); to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len); to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id); if (to_r0kh && to_r1kh) { wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID"); goto out; } if (!to_r0kh && !to_r1kh) { wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID"); goto out; } if (!to_r0kh) { wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh, &r0kh_wildcard); if (!r0kh_wildcard && (!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) { wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID", f_r0kh_id, f_r0kh_id_len); goto out; } if (r0kh) { *key = r0kh->key; *key_len = sizeof(r0kh->key); } else { *key = r0kh_wildcard->key; *key_len = sizeof(r0kh_wildcard->key); } } if (!to_r1kh) { wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard); if (!r1kh_wildcard && (!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) { wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID", f_r1kh_id, FT_R1KH_ID_LEN); goto out; } if (r1kh) { *key = r1kh->key; *key_len = sizeof(r1kh->key); } else { *key = r1kh_wildcard->key; *key_len = sizeof(r1kh_wildcard->key); } } if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len, src_addr, type, &plain, &plain_len) < 0) goto out; os_free(plain); if (!to_r0kh) { if (!r0kh) r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr, f_r0kh_id, f_r0kh_id_len, ftRRBseqTimeout); if (!r0kh) goto out; wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout); *rkh_seq = r0kh->seq; if (r0kh_out) *r0kh_out = r0kh; if (r0kh_wildcard_out) *r0kh_wildcard_out = r0kh_wildcard; } if (!to_r1kh) { if (!r1kh) r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr, f_r1kh_id, ftRRBseqTimeout); if (!r1kh) goto out; wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout); *rkh_seq = r1kh->seq; if (r1kh_out) *r1kh_out = r1kh; if (r1kh_wildcard_out) *r1kh_wildcard_out = r1kh_wildcard; } return 0; out: return -1; } static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer) { int ret = -1; struct ft_rrb_seq f_seq; const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id; size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len; struct ft_remote_seq *rkh_seq = NULL; u8 *packet = NULL, *key = NULL; size_t packet_len = 0, key_len = 0; struct tlv_list seq_resp_auth[5]; wpa_printf(MSG_DEBUG, "FT: Received sequence number request"); if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ, enc, enc_len, auth, auth_len, &rkh_seq, &key, &key_len, NULL, NULL, NULL, NULL) < 0) goto out; RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len); RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1); RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN); if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to get seq num"); goto out; } wpa_printf(MSG_DEBUG, "FT: Send sequence number response from " MACSTR " to " MACSTR, MAC2STR(wpa_auth->addr), MAC2STR(src_addr)); seq_resp_auth[0].type = FT_RRB_NONCE; seq_resp_auth[0].len = f_nonce_len; seq_resp_auth[0].data = f_nonce; seq_resp_auth[1].type = FT_RRB_SEQ; seq_resp_auth[1].len = sizeof(f_seq); seq_resp_auth[1].data = (u8 *) &f_seq; seq_resp_auth[2].type = FT_RRB_R0KH_ID; seq_resp_auth[2].len = f_r0kh_id_len; seq_resp_auth[2].data = f_r0kh_id; seq_resp_auth[3].type = FT_RRB_R1KH_ID; seq_resp_auth[3].len = FT_R1KH_ID_LEN; seq_resp_auth[3].data = f_r1kh_id; seq_resp_auth[4].type = FT_RRB_LAST_EMPTY; seq_resp_auth[4].len = 0; seq_resp_auth[4].data = NULL; if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth, NULL, wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP, &packet, &packet_len) < 0) goto out; wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP, packet, packet_len); out: os_free(packet); return ret; } static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *enc, size_t enc_len, const u8 *auth, size_t auth_len, int no_defer) { u8 *key = NULL; size_t key_len = 0; struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL; struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL; const u8 *f_nonce, *f_seq; size_t f_nonce_len, f_seq_len; struct ft_remote_seq *rkh_seq = NULL; struct ft_remote_item *item; struct os_reltime now, now_remote; int seq_ret, found; const struct ft_rrb_seq *msg_both; u32 msg_dom, msg_seq; wpa_printf(MSG_DEBUG, "FT: Received sequence number response"); if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP, enc, enc_len, auth, auth_len, &rkh_seq, &key, &key_len, &r0kh, &r1kh, &r0kh_wildcard, &r1kh_wildcard) < 0) goto out; RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce, f_nonce_len); found = 0; dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item, list) { if (os_memcmp_const(f_nonce, item->nonce, FT_RRB_NONCE_LEN) != 0 || os_get_reltime(&now) < 0 || os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout)) continue; found = 1; break; } if (!found) { wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce"); goto out; } if (r0kh) { wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, wpa_auth->conf.rkh_pos_timeout); if (r0kh_wildcard) os_memcpy(r0kh->addr, src_addr, ETH_ALEN); } if (r1kh) { wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, wpa_auth->conf.rkh_pos_timeout); if (r1kh_wildcard) os_memcpy(r1kh->addr, src_addr, ETH_ALEN); } seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth, auth_len, "seq response", 1); if (seq_ret == FT_RRB_SEQ_OK) { wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number"); wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth, auth_len, "seq response"); } else { wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number"); RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response", sizeof(*msg_both)); msg_both = (const struct ft_rrb_seq *) f_seq; msg_dom = le_to_host32(msg_both->dom); msg_seq = le_to_host32(msg_both->seq); now_remote.sec = le_to_host32(msg_both->ts); now_remote.usec = 0; rkh_seq->rx.num_last = 2; rkh_seq->rx.dom = msg_dom; rkh_seq->rx.offsetidx = 0; /* Accept some older, possibly cached packets as well */ rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG - dl_list_len(&rkh_seq->rx.queue); rkh_seq->rx.last[1] = msg_seq; /* local time - offset = remote time * <=> local time - remote time = offset */ os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset); } wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1); return 0; out: return -1; } int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *data, size_t data_len) { struct ft_rrb_frame *frame; u16 alen; const u8 *pos, *end, *start; u8 action; const u8 *sta_addr, *target_ap_addr; wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, MAC2STR(src_addr)); if (data_len < sizeof(*frame)) { wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", (unsigned long) data_len); return -1; } pos = data; frame = (struct ft_rrb_frame *) pos; pos += sizeof(*frame); alen = le_to_host16(frame->action_length); wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " "action_length=%d ap_address=" MACSTR, frame->frame_type, frame->packet_type, alen, MAC2STR(frame->ap_address)); if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " "unrecognized type %d", frame->frame_type); return -1; } if (alen > data_len - sizeof(*frame)) { wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " "frame"); return -1; } wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); if (alen < 1 + 1 + 2 * ETH_ALEN) { wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " "room for Action Frame body); alen=%lu", (unsigned long) alen); return -1; } start = pos; end = pos + alen; if (*pos != WLAN_ACTION_FT) { wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " "%d", *pos); return -1; } pos++; action = *pos++; sta_addr = pos; pos += ETH_ALEN; target_ap_addr = pos; pos += ETH_ALEN; wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" MACSTR " target_ap_addr=" MACSTR, action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); if (frame->packet_type == FT_PACKET_REQUEST) { wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); if (action != 1) { wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " "RRB Request", action); return -1; } if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Target AP address in the " "RRB Request does not match with own " "address"); return -1; } if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, sta_addr, pos, end - pos) < 0) return -1; } else if (frame->packet_type == FT_PACKET_RESPONSE) { u16 status_code; if (end - pos < 2) { wpa_printf(MSG_DEBUG, "FT: Not enough room for status " "code in RRB Response"); return -1; } status_code = WPA_GET_LE16(pos); wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " "(status_code=%d)", status_code); if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) return -1; } else { wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " "packet_type %d", frame->packet_type); return -1; } return 0; } void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, const u8 *dst_addr, u8 oui_suffix, const u8 *data, size_t data_len) { const u8 *auth, *enc; size_t alen, elen; int no_defer = 0; wpa_printf(MSG_DEBUG, "FT: RRB-OUI(" MACSTR ") received frame from remote AP " MACSTR " oui_suffix=%u dst=" MACSTR, MAC2STR(wpa_auth->addr), MAC2STR(src_addr), oui_suffix, MAC2STR(dst_addr)); wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", data, data_len); if (is_multicast_ether_addr(src_addr)) { wpa_printf(MSG_DEBUG, "FT: RRB-OUI received frame from multicast address " MACSTR, MAC2STR(src_addr)); return; } if (is_multicast_ether_addr(dst_addr)) no_defer = 1; if (data_len < sizeof(u16)) { wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short"); return; } alen = WPA_GET_LE16(data); if (data_len < sizeof(u16) + alen) { wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short"); return; } auth = data + sizeof(u16); wpa_hexdump(MSG_MSGDUMP, "FT: Authenticated payload", auth, alen); enc = data + sizeof(u16) + alen; elen = data_len - sizeof(u16) - alen; wpa_hexdump(MSG_MSGDUMP, "FT: Encrypted payload", enc, elen); switch (oui_suffix) { case FT_PACKET_R0KH_R1KH_PULL: wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen, no_defer); break; case FT_PACKET_R0KH_R1KH_RESP: wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen, no_defer); break; case FT_PACKET_R0KH_R1KH_PUSH: wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen, no_defer); break; case FT_PACKET_R0KH_R1KH_SEQ_REQ: wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen, no_defer); break; case FT_PACKET_R0KH_R1KH_SEQ_RESP: wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth, alen, no_defer); break; } } static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, struct wpa_ft_pmk_r0_sa *pmk_r0, struct ft_remote_r1kh *r1kh, const u8 *s1kh_id) { u8 *packet; size_t packet_len; struct ft_rrb_seq f_seq; struct tlv_list push[] = { { .type = FT_RRB_S1KH_ID, .len = ETH_ALEN, .data = s1kh_id }, { .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN, .data = pmk_r0->pmk_r0_name }, { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL }, }; struct tlv_list push_auth[] = { { .type = FT_RRB_SEQ, .len = sizeof(f_seq), .data = (u8 *) &f_seq }, { .type = FT_RRB_R0KH_ID, .len = wpa_auth->conf.r0_key_holder_len, .data = wpa_auth->conf.r0_key_holder }, { .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN, .data = r1kh->id }, { .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL }, }; if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to get seq num"); return -1; } wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 push from " MACSTR " to remote R0KH address " MACSTR, MAC2STR(wpa_auth->addr), MAC2STR(r1kh->addr)); if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0, r1kh->id, s1kh_id, push_auth, wpa_auth->addr, FT_PACKET_R0KH_R1KH_PUSH, &packet, &packet_len) < 0) return -1; wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH, packet, packet_len); os_free(packet); return 0; } void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) { struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; struct wpa_ft_pmk_r0_sa *r0, *r0found = NULL; struct ft_remote_r1kh *r1kh; if (!wpa_auth->conf.pmk_r1_push) return; if (!wpa_auth->conf.r1kh_list) return; dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) { if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) { r0found = r0; break; } } r0 = r0found; if (r0 == NULL || r0->pmk_r1_pushed) return; r0->pmk_r1_pushed = 1; wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " "for STA " MACSTR, MAC2STR(addr)); for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) { if (is_zero_ether_addr(r1kh->addr) || is_zero_ether_addr(r1kh->id)) continue; if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0) continue; wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr); } } #endif /* CONFIG_IEEE80211R_AP */