mirror of
https://github.com/vanhoefm/fragattacks.git
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d0fc6e1211
This needs to be replaced with proper RSN IE from the peer STA (e.g., from Probe Response).
330 lines
7.6 KiB
C
330 lines
7.6 KiB
C
/*
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* wpa_supplicant - IBSS RSN
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* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "l2_packet/l2_packet.h"
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#include "wpa_supplicant_i.h"
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#include "wpa.h"
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#include "wpa_ie.h"
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#include "../hostapd/wpa.h"
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#include "ibss_rsn.h"
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static void ibss_rsn_free(struct ibss_rsn_peer *peer)
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{
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wpa_auth_sta_deinit(peer->auth);
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wpa_sm_deinit(peer->supp);
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os_free(peer);
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}
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static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
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size_t len)
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{
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struct ibss_rsn_peer *peer = ctx;
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struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
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wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
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"len=%lu)",
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__func__, MAC2STR(dest), proto, (unsigned long) len);
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if (wpa_s->l2)
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return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
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return wpa_drv_send_eapol(wpa_s, dest, proto, buf, len);
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}
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static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
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u16 data_len, size_t *msg_len, void **data_pos)
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{
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struct ieee802_1x_hdr *hdr;
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wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
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__func__, type, data_len);
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*msg_len = sizeof(*hdr) + data_len;
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hdr = os_malloc(*msg_len);
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if (hdr == NULL)
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return NULL;
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hdr->version = 2;
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hdr->type = type;
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hdr->length = host_to_be16(data_len);
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if (data)
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os_memcpy(hdr + 1, data, data_len);
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else
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os_memset(hdr + 1, 0, data_len);
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if (data_pos)
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*data_pos = hdr + 1;
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return (u8 *) hdr;
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}
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static int supp_get_beacon_ie(void *ctx)
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{
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wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
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/* TODO */
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return -1;
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}
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static int supp_set_key(void *ctx, wpa_alg alg,
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const u8 *addr, int key_idx, int set_tx,
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const u8 *seq, size_t seq_len,
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const u8 *key, size_t key_len)
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{
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wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
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"set_tx=%d)",
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__func__, alg, MAC2STR(addr), key_idx, set_tx);
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wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
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wpa_hexdump(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
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return 0;
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}
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static int supp_mlme_setprotection(void *ctx, const u8 *addr,
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int protection_type, int key_type)
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{
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wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
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"key_type=%d)",
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__func__, MAC2STR(addr), protection_type, key_type);
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return 0;
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}
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static void supp_cancel_auth_timeout(void *ctx)
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{
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wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
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}
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int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
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const u8 *psk)
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{
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struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return -1;
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ctx->ctx = peer;
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ctx->ether_send = supp_ether_send;
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ctx->get_beacon_ie = supp_get_beacon_ie;
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ctx->alloc_eapol = supp_alloc_eapol;
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ctx->set_key = supp_set_key;
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ctx->mlme_setprotection = supp_mlme_setprotection;
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ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
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peer->supp = wpa_sm_init(ctx);
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if (peer->supp == NULL) {
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wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
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return -1;
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}
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wpa_sm_set_own_addr(peer->supp, own_addr);
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wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
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wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
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wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
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wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
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wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
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wpa_sm_set_pmk(peer->supp, psk, PMK_LEN);
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#if 0 /* TODO? */
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peer->supp_ie_len = sizeof(peer->supp_ie);
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if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
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&peer->supp_ie_len) < 0) {
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wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
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" failed");
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return -1;
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}
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#endif
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wpa_sm_notify_assoc(peer->supp, peer->addr);
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return 0;
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}
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static void auth_logger(void *ctx, const u8 *addr, logger_level level,
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const char *txt)
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{
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if (addr)
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wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
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MAC2STR(addr), txt);
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else
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wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
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}
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static const u8 * auth_get_psk(void *ctx, const u8 *addr, const u8 *prev_psk)
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{
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struct ibss_rsn *ibss_rsn = ctx;
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wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
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__func__, MAC2STR(addr), prev_psk);
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if (prev_psk)
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return NULL;
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return ibss_rsn->psk;
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}
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static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
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size_t data_len, int encrypt)
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{
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struct ibss_rsn_peer *peer = ctx;
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struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
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wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
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"encrypt=%d)",
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__func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
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if (wpa_s->l2)
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return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
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data_len);
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return wpa_drv_send_eapol(wpa_s, addr, ETH_P_EAPOL, data, data_len);
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}
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static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
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const u8 *own_addr)
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{
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struct wpa_auth_config conf;
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struct wpa_auth_callbacks cb;
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wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
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os_memset(&conf, 0, sizeof(conf));
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conf.wpa = 2;
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conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
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conf.wpa_pairwise = WPA_CIPHER_CCMP;
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conf.rsn_pairwise = WPA_CIPHER_CCMP;
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conf.wpa_group = WPA_CIPHER_CCMP;
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conf.eapol_version = 2;
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os_memset(&cb, 0, sizeof(cb));
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cb.ctx = ibss_rsn;
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cb.logger = auth_logger;
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cb.send_eapol = auth_send_eapol;
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cb.get_psk = auth_get_psk;
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ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
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if (ibss_rsn->auth_group == NULL) {
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wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
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return -1;
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}
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return 0;
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}
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static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
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struct ibss_rsn_peer *peer)
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{
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peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr);
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if (peer->auth == NULL) {
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wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
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return -1;
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}
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/* TODO: get peer RSN IE with Probe Request */
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if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
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(u8 *) "\x30\x12\x01\x00"
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"\x00\x0f\xac\x04"
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"\x01\x00\x00\x0f\xac\x04"
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"\x01\x00\x00\x0f\xac\x02", 20, NULL, 0) !=
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WPA_IE_OK) {
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wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
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return -1;
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}
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wpa_auth_sm_event(peer->auth, WPA_ASSOC);
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wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth);
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return 0;
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}
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int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
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{
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struct ibss_rsn_peer *peer;
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wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator and "
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"Supplicant for peer " MACSTR, MAC2STR(addr));
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peer = os_zalloc(sizeof(*peer));
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if (peer == NULL)
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return -1;
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peer->ibss_rsn = ibss_rsn;
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os_memcpy(peer->addr, addr, ETH_ALEN);
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if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr, ibss_rsn->psk)
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< 0) {
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ibss_rsn_free(peer);
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return -1;
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}
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if (ibss_rsn_auth_init(ibss_rsn, peer) < 0) {
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ibss_rsn_free(peer);
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return -1;
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}
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peer->next = ibss_rsn->peers;
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ibss_rsn->peers = peer;
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return 0;
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}
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struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
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{
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struct ibss_rsn *ibss_rsn;
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ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
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if (ibss_rsn == NULL)
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return NULL;
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ibss_rsn->wpa_s = wpa_s;
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if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
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ibss_rsn_deinit(ibss_rsn);
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return NULL;
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}
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return ibss_rsn;
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}
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void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
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{
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struct ibss_rsn_peer *peer, *prev;
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if (ibss_rsn == NULL)
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return;
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peer = ibss_rsn->peers;
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while (peer) {
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prev = peer;
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peer = peer->next;
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ibss_rsn_free(prev);
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}
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wpa_deinit(ibss_rsn->auth_group);
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os_free(ibss_rsn);
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}
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