wpa_common.c

最新的Host AP 新添加了许多pcmcia 的驱动

/*
 * WPA/RSN - Shared functions for supplicant and authenticator
 * Copyright (c) 2002-2008, Jouni Malinen <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "md5.h"
#include "sha1.h"
#include "sha256.h"
#include "aes_wrap.h"
#include "crypto.h"
#include "ieee802_11_defs.h"
#include "defs.h"
#include "wpa_common.h"


/**
 * wpa_eapol_key_mic - Calculate EAPOL-Key MIC
 * @key: EAPOL-Key Key Confirmation Key (KCK)
 * @ver: Key descriptor version (WPA_KEY_INFO_TYPE_*)
 * @buf: Pointer to the beginning of the EAPOL header (version field)
 * @len: Length of the EAPOL frame (from EAPOL header to the end of the frame)
 * @mic: Pointer to the buffer to which the EAPOL-Key MIC is written
 * Returns: 0 on success, -1 on failure
 *
 * Calculate EAPOL-Key MIC for an EAPOL-Key packet. The EAPOL-Key MIC field has
 * to be cleared (all zeroes) when calling this function.
 *
 * Note: 'IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames' has an error in the
 * description of the Key MIC calculation. It includes packet data from the
 * beginning of the EAPOL-Key header, not EAPOL header. This incorrect change
 * happened during final editing of the standard and the correct behavior is
 * defined in the last draft (IEEE 802.11i/D10).
 */
int wpa_eapol_key_mic(const u8 *key, int ver, const u8 *buf, size_t len,
		      u8 *mic)
{
	u8 hash[SHA1_MAC_LEN];

	switch (ver) {
	case WPA_KEY_INFO_TYPE_HMAC_MD5_RC4:
		hmac_md5(key, 16, buf, len, mic);
		break;
	case WPA_KEY_INFO_TYPE_HMAC_SHA1_AES:
		hmac_sha1(key, 16, buf, len, hash);
		os_memcpy(mic, hash, MD5_MAC_LEN);
		break;
#if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W)
	case WPA_KEY_INFO_TYPE_AES_128_CMAC:
		return omac1_aes_128(key, buf, len, mic);
#endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */
	default:
		return -1;
	}

	return 0;
}


/**
 * wpa_pmk_to_ptk - Calculate PTK from PMK, addresses, and nonces
 * @pmk: Pairwise master key
 * @pmk_len: Length of PMK
 * @label: Label to use in derivation
 * @addr1: AA or SA
 * @addr2: SA or AA
 * @nonce1: ANonce or SNonce
 * @nonce2: SNonce or ANonce
 * @ptk: Buffer for pairwise transient key
 * @ptk_len: Length of PTK
 * @use_sha256: Whether to use SHA256-based KDF
 *
 * IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy
 * PTK = PRF-X(PMK, "Pairwise key expansion",
 *             Min(AA, SA) || Max(AA, SA) ||
 *             Min(ANonce, SNonce) || Max(ANonce, SNonce))
 *
 * STK = PRF-X(SMK, "Peer key expansion",
 *             Min(MAC_I, MAC_P) || Max(MAC_I, MAC_P) ||
 *             Min(INonce, PNonce) || Max(INonce, PNonce))
 */
void wpa_pmk_to_ptk(const u8 *pmk, size_t pmk_len, const char *label,
		    const u8 *addr1, const u8 *addr2,
		    const u8 *nonce1, const u8 *nonce2,
		    u8 *ptk, size_t ptk_len, int use_sha256)
{
	u8 data[2 * ETH_ALEN + 2 * WPA_NONCE_LEN];

	if (os_memcmp(addr1, addr2, ETH_ALEN) < 0) {
		os_memcpy(data, addr1, ETH_ALEN);
		os_memcpy(data + ETH_ALEN, addr2, ETH_ALEN);
	} else {
		os_memcpy(data, addr2, ETH_ALEN);
		os_memcpy(data + ETH_ALEN, addr1, ETH_ALEN);
	}

	if (os_memcmp(nonce1, nonce2, WPA_NONCE_LEN) < 0) {
		os_memcpy(data + 2 * ETH_ALEN, nonce1, WPA_NONCE_LEN);
		os_memcpy(data + 2 * ETH_ALEN + WPA_NONCE_LEN, nonce2,
			  WPA_NONCE_LEN);
	} else {
		os_memcpy(data + 2 * ETH_ALEN, nonce2, WPA_NONCE_LEN);
		os_memcpy(data + 2 * ETH_ALEN + WPA_NONCE_LEN, nonce1,
			  WPA_NONCE_LEN);
	}

#ifdef CONFIG_IEEE80211W
	if (use_sha256)
		sha256_prf(pmk, pmk_len, label, data, sizeof(data),
			   ptk, ptk_len);
	else
#endif /* CONFIG_IEEE80211W */
		sha1_prf(pmk, pmk_len, label, data, sizeof(data), ptk,
			 ptk_len);

	wpa_printf(MSG_DEBUG, "WPA: PTK derivation - A1=" MACSTR " A2=" MACSTR,
		   MAC2STR(addr1), MAC2STR(addr2));
	wpa_hexdump_key(MSG_DEBUG, "WPA: PMK", pmk, pmk_len);
	wpa_hexdump_key(MSG_DEBUG, "WPA: PTK", ptk, ptk_len);
}


#ifdef CONFIG_IEEE80211R
int wpa_ft_mic(const u8 *kck, const u8 *sta_addr, const u8 *ap_addr,
	       u8 transaction_seqnum, const u8 *mdie, size_t mdie_len,
	       const u8 *ftie, size_t ftie_len,
	       const u8 *rsnie, size_t rsnie_len,
	       const u8 *ric, size_t ric_len, u8 *mic)
{
	u8 *buf, *pos;
	size_t buf_len;

	buf_len = 2 * ETH_ALEN + 1 + mdie_len + ftie_len + rsnie_len + ric_len;
	buf = os_malloc(buf_len);
	if (buf == NULL)
		return -1;

	pos = buf;
	os_memcpy(pos, sta_addr, ETH_ALEN);
	pos += ETH_ALEN;
	os_memcpy(pos, ap_addr, ETH_ALEN);
	pos += ETH_ALEN;
	*pos++ = transaction_seqnum;
	if (rsnie) {
		os_memcpy(pos, rsnie, rsnie_len);
		pos += rsnie_len;
	}
	if (mdie) {
		os_memcpy(pos, mdie, mdie_len);
		pos += mdie_len;
	}
	if (ftie) {
		struct rsn_ftie *_ftie;
		os_memcpy(pos, ftie, ftie_len);
		if (ftie_len < 2 + sizeof(*_ftie)) {
			os_free(buf);
			return -1;
		}
		_ftie = (struct rsn_ftie *) (pos + 2);
		os_memset(_ftie->mic, 0, sizeof(_ftie->mic));
		pos += ftie_len;
	}
	if (ric) {
		os_memcpy(pos, ric, ric_len);
		pos += ric_len;
	}

	wpa_hexdump(MSG_MSGDUMP, "FT: MIC data", buf, pos - buf);
	if (omac1_aes_128(kck, buf, pos - buf, mic)) {
		os_free(buf);
		return -1;
	}

	os_free(buf);

	return 0;
}
#endif /* CONFIG_IEEE80211R */


#ifndef CONFIG_NO_WPA2
static int rsn_selector_to_bitfield(const u8 *s)
{
	if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_NONE)
		return WPA_CIPHER_NONE;
	if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP40)
		return WPA_CIPHER_WEP40;
	if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_TKIP)
		return WPA_CIPHER_TKIP;
	if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_CCMP)
		return WPA_CIPHER_CCMP;
	if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP104)
		return WPA_CIPHER_WEP104;
#ifdef CONFIG_IEEE80211W
	if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_AES_128_CMAC)
		return WPA_CIPHER_AES_128_CMAC;
#endif /* CONFIG_IEEE80211W */
	return 0;
}


static int rsn_key_mgmt_to_bitfield(const u8 *s)
{
	if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_UNSPEC_802_1X)
		return WPA_KEY_MGMT_IEEE8021X;
	if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X)
		return WPA_KEY_MGMT_PSK;
#ifdef CONFIG_IEEE80211R
	if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_802_1X)
		return WPA_KEY_MGMT_FT_IEEE8021X;
	if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_PSK)
		return WPA_KEY_MGMT_FT_PSK;
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211W
	if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_802_1X_SHA256)
		return WPA_KEY_MGMT_IEEE8021X_SHA256;
	if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_SHA256)
		return WPA_KEY_MGMT_PSK_SHA256;
#endif /* CONFIG_IEEE80211W */
	return 0;
}
#endif /* CONFIG_NO_WPA2 */


/**
 * wpa_parse_wpa_ie_rsn - Parse RSN IE
 * @rsn_ie: Buffer containing RSN IE
 * @rsn_ie_len: RSN IE buffer length (including IE number and length octets)
 * @data: Pointer to structure that will be filled in with parsed data
 * Returns: 0 on success, <0 on failure
 */
int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len,
			 struct wpa_ie_data *data)
{
#ifndef CONFIG_NO_WPA2
	const struct rsn_ie_hdr *hdr;
	const u8 *pos;
	int left;
	int i, count;

	os_memset(data, 0, sizeof(*data));
	data->proto = WPA_PROTO_RSN;
	data->pairwise_cipher = WPA_CIPHER_CCMP;
	data->group_cipher = WPA_CIPHER_CCMP;
	data->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
	data->capabilities = 0;
	data->pmkid = NULL;
	data->num_pmkid = 0;
#ifdef CONFIG_IEEE80211W
	data->mgmt_group_cipher = WPA_CIPHER_AES_128_CMAC;
#else /* CONFIG_IEEE80211W */
	data->mgmt_group_cipher = 0;
#endif /* CONFIG_IEEE80211W */

	if (rsn_ie_len == 0) {
		/* No RSN IE - fail silently */
		return -1;
	}

	if (rsn_ie_len < sizeof(struct rsn_ie_hdr)) {
		wpa_printf(MSG_DEBUG, "%s: ie len too short %lu",
			   __func__, (unsigned long) rsn_ie_len);
		return -1;
	}

	hdr = (const struct rsn_ie_hdr *) rsn_ie;

	if (hdr->elem_id != WLAN_EID_RSN ||
	    hdr->len != rsn_ie_len - 2 ||
	    WPA_GET_LE16(hdr->version) != RSN_VERSION) {
		wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version",
			   __func__);
		return -2;
	}