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1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 | /*
*************************************************************************
* Ralink Tech Inc.
* 5F., No.36, Taiyuan St., Jhubei City,
* Hsinchu County 302,
* Taiwan, R.O.C.
*
* (c) Copyright 2002-2007, Ralink Technology, Inc.
*
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
*************************************************************************
Module Name:
wpa.c
Abstract:
Revision History:
Who When What
-------- ---------- ----------------------------------------------
Jan Lee 03-07-22 Initial
Paul Lin 03-11-28 Modify for supplicant
*/
#include "../rt_config.h"
// WPA OUI
UCHAR OUI_WPA_NONE_AKM[4] = {0x00, 0x50, 0xF2, 0x00};
UCHAR OUI_WPA_VERSION[4] = {0x00, 0x50, 0xF2, 0x01};
UCHAR OUI_WPA_WEP40[4] = {0x00, 0x50, 0xF2, 0x01};
UCHAR OUI_WPA_TKIP[4] = {0x00, 0x50, 0xF2, 0x02};
UCHAR OUI_WPA_CCMP[4] = {0x00, 0x50, 0xF2, 0x04};
UCHAR OUI_WPA_WEP104[4] = {0x00, 0x50, 0xF2, 0x05};
UCHAR OUI_WPA_8021X_AKM[4] = {0x00, 0x50, 0xF2, 0x01};
UCHAR OUI_WPA_PSK_AKM[4] = {0x00, 0x50, 0xF2, 0x02};
// WPA2 OUI
UCHAR OUI_WPA2_WEP40[4] = {0x00, 0x0F, 0xAC, 0x01};
UCHAR OUI_WPA2_TKIP[4] = {0x00, 0x0F, 0xAC, 0x02};
UCHAR OUI_WPA2_CCMP[4] = {0x00, 0x0F, 0xAC, 0x04};
UCHAR OUI_WPA2_8021X_AKM[4] = {0x00, 0x0F, 0xAC, 0x01};
UCHAR OUI_WPA2_PSK_AKM[4] = {0x00, 0x0F, 0xAC, 0x02};
UCHAR OUI_WPA2_WEP104[4] = {0x00, 0x0F, 0xAC, 0x05};
// MSA OUI
UCHAR OUI_MSA_8021X_AKM[4] = {0x00, 0x0F, 0xAC, 0x05}; // Not yet final - IEEE 802.11s-D1.06
UCHAR OUI_MSA_PSK_AKM[4] = {0x00, 0x0F, 0xAC, 0x06}; // Not yet final - IEEE 802.11s-D1.06
/*
========================================================================
Routine Description:
The pseudo-random function(PRF) that hashes various inputs to
derive a pseudo-random value. To add liveness to the pseudo-random
value, a nonce should be one of the inputs.
It is used to generate PTK, GTK or some specific random value.
Arguments:
UCHAR *key, - the key material for HMAC_SHA1 use
INT key_len - the length of key
UCHAR *prefix - a prefix label
INT prefix_len - the length of the label
UCHAR *data - a specific data with variable length
INT data_len - the length of a specific data
INT len - the output lenght
Return Value:
UCHAR *output - the calculated result
Note:
802.11i-2004 Annex H.3
========================================================================
*/
VOID PRF(
IN UCHAR *key,
IN INT key_len,
IN UCHAR *prefix,
IN INT prefix_len,
IN UCHAR *data,
IN INT data_len,
OUT UCHAR *output,
IN INT len)
{
INT i;
UCHAR *input;
INT currentindex = 0;
INT total_len;
// Allocate memory for input
os_alloc_mem(NULL, (PUCHAR *)&input, 1024);
if (input == NULL)
{
DBGPRINT(RT_DEBUG_ERROR, ("!!!PRF: no memory!!!\n"));
return;
}
// Generate concatenation input
NdisMoveMemory(input, prefix, prefix_len);
// Concatenate a single octet containing 0
input[prefix_len] = 0;
// Concatenate specific data
NdisMoveMemory(&input[prefix_len + 1], data, data_len);
total_len = prefix_len + 1 + data_len;
// Concatenate a single octet containing 0
// This octet shall be update later
input[total_len] = 0;
total_len++;
// Iterate to calculate the result by hmac-sha-1
// Then concatenate to last result
for (i = 0; i < (len + 19) / 20; i++)
{
HMAC_SHA1(input, total_len, key, key_len, &output[currentindex]);
currentindex += 20;
// update the last octet
input[total_len - 1]++;
}
os_free_mem(NULL, input);
}
/*
========================================================================
Routine Description:
It utilizes PRF-384 or PRF-512 to derive session-specific keys from a PMK.
It shall be called by 4-way handshake processing.
Arguments:
pAd - pointer to our pAdapter context
PMK - pointer to PMK
ANonce - pointer to ANonce
AA - pointer to Authenticator Address
SNonce - pointer to SNonce
SA - pointer to Supplicant Address
len - indicate the length of PTK (octet)
Return Value:
Output pointer to the PTK
Note:
Refer to IEEE 802.11i-2004 8.5.1.2
========================================================================
*/
VOID WpaCountPTK(
IN PRTMP_ADAPTER pAd,
IN UCHAR *PMK,
IN UCHAR *ANonce,
IN UCHAR *AA,
IN UCHAR *SNonce,
IN UCHAR *SA,
OUT UCHAR *output,
IN UINT len)
{
UCHAR concatenation[76];
UINT CurrPos = 0;
UCHAR temp[32];
UCHAR Prefix[] = {'P', 'a', 'i', 'r', 'w', 'i', 's', 'e', ' ', 'k', 'e', 'y', ' ',
'e', 'x', 'p', 'a', 'n', 's', 'i', 'o', 'n'};
// initiate the concatenation input
NdisZeroMemory(temp, sizeof(temp));
NdisZeroMemory(concatenation, 76);
// Get smaller address
if (RTMPCompareMemory(SA, AA, 6) == 1)
NdisMoveMemory(concatenation, AA, 6);
else
NdisMoveMemory(concatenation, SA, 6);
CurrPos += 6;
// Get larger address
if (RTMPCompareMemory(SA, AA, 6) == 1)
NdisMoveMemory(&concatenation[CurrPos], SA, 6);
else
NdisMoveMemory(&concatenation[CurrPos], AA, 6);
// store the larger mac address for backward compatible of
// ralink proprietary STA-key issue
NdisMoveMemory(temp, &concatenation[CurrPos], MAC_ADDR_LEN);
CurrPos += 6;
// Get smaller Nonce
if (RTMPCompareMemory(ANonce, SNonce, 32) == 0)
NdisMoveMemory(&concatenation[CurrPos], temp, 32); // patch for ralink proprietary STA-key issue
else if (RTMPCompareMemory(ANonce, SNonce, 32) == 1)
NdisMoveMemory(&concatenation[CurrPos], SNonce, 32);
else
NdisMoveMemory(&concatenation[CurrPos], ANonce, 32);
CurrPos += 32;
// Get larger Nonce
if (RTMPCompareMemory(ANonce, SNonce, 32) == 0)
NdisMoveMemory(&concatenation[CurrPos], temp, 32); // patch for ralink proprietary STA-key issue
else if (RTMPCompareMemory(ANonce, SNonce, 32) == 1)
NdisMoveMemory(&concatenation[CurrPos], ANonce, 32);
else
NdisMoveMemory(&concatenation[CurrPos], SNonce, 32);
CurrPos += 32;
hex_dump("concatenation=", concatenation, 76);
// Use PRF to generate PTK
PRF(PMK, LEN_MASTER_KEY, Prefix, 22, concatenation, 76, output, len);
}
/*
========================================================================
Routine Description:
Generate random number by software.
Arguments:
pAd - pointer to our pAdapter context
macAddr - pointer to local MAC address
Return Value:
Note:
802.1ii-2004 Annex H.5
========================================================================
*/
VOID GenRandom(
IN PRTMP_ADAPTER pAd,
IN UCHAR *macAddr,
OUT UCHAR *random)
{
INT i, curr;
UCHAR local[80], KeyCounter[32];
UCHAR result[80];
ULONG CurrentTime;
UCHAR prefix[] = {'I', 'n', 'i', 't', ' ', 'C', 'o', 'u', 'n', 't', 'e', 'r'};
// Zero the related information
NdisZeroMemory(result, 80);
NdisZeroMemory(local, 80);
NdisZeroMemory(KeyCounter, 32);
for (i = 0; i < 32; i++)
{
// copy the local MAC address
COPY_MAC_ADDR(local, macAddr);
curr = MAC_ADDR_LEN;
// concatenate the current time
NdisGetSystemUpTime(&CurrentTime);
NdisMoveMemory(&local[curr], &CurrentTime, sizeof(CurrentTime));
curr += sizeof(CurrentTime);
// concatenate the last result
NdisMoveMemory(&local[curr], result, 32);
curr += 32;
// concatenate a variable
NdisMoveMemory(&local[curr], &i, 2);
curr += 2;
// calculate the result
PRF(KeyCounter, 32, prefix,12, local, curr, result, 32);
}
NdisMoveMemory(random, result, 32);
}
/*
========================================================================
Routine Description:
Build cipher suite in RSN-IE.
It only shall be called by RTMPMakeRSNIE.
Arguments:
pAd - pointer to our pAdapter context
ElementID - indicate the WPA1 or WPA2
WepStatus - indicate the encryption type
bMixCipher - a boolean to indicate the pairwise cipher and group
cipher are the same or not
Return Value:
Note:
========================================================================
*/
static VOID RTMPInsertRsnIeCipher(
IN PRTMP_ADAPTER pAd,
IN UCHAR ElementID,
IN UINT WepStatus,
IN BOOLEAN bMixCipher,
IN UCHAR FlexibleCipher,
OUT PUCHAR pRsnIe,
OUT UCHAR *rsn_len)
{
UCHAR PairwiseCnt;
*rsn_len = 0;
// decide WPA2 or WPA1
if (ElementID == Wpa2Ie)
{
RSNIE2 *pRsnie_cipher = (RSNIE2*)pRsnIe;
// Assign the verson as 1
pRsnie_cipher->version = 1;
switch (WepStatus)
{
// TKIP mode
case Ndis802_11Encryption2Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA2_TKIP, 4);
pRsnie_cipher->ucount = 1;
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA2_TKIP, 4);
*rsn_len = sizeof(RSNIE2);
break;
// AES mode
case Ndis802_11Encryption3Enabled:
if (bMixCipher)
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA2_TKIP, 4);
else
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA2_CCMP, 4);
pRsnie_cipher->ucount = 1;
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA2_CCMP, 4);
*rsn_len = sizeof(RSNIE2);
break;
// TKIP-AES mix mode
case Ndis802_11Encryption4Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA2_TKIP, 4);
PairwiseCnt = 1;
// Insert WPA2 TKIP as the first pairwise cipher
if (MIX_CIPHER_WPA2_TKIP_ON(FlexibleCipher))
{
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA2_TKIP, 4);
// Insert WPA2 AES as the secondary pairwise cipher
if (MIX_CIPHER_WPA2_AES_ON(FlexibleCipher))
{
NdisMoveMemory(pRsnie_cipher->ucast[0].oui + 4, OUI_WPA2_CCMP, 4);
PairwiseCnt = 2;
}
}
else
{
// Insert WPA2 AES as the first pairwise cipher
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA2_CCMP, 4);
}
pRsnie_cipher->ucount = PairwiseCnt;
*rsn_len = sizeof(RSNIE2) + (4 * (PairwiseCnt - 1));
break;
}
#ifdef CONFIG_STA_SUPPORT
if ((pAd->OpMode == OPMODE_STA) &&
(pAd->StaCfg.GroupCipher != Ndis802_11Encryption2Enabled) &&
(pAd->StaCfg.GroupCipher != Ndis802_11Encryption3Enabled))
{
UINT GroupCipher = pAd->StaCfg.GroupCipher;
switch(GroupCipher)
{
case Ndis802_11GroupWEP40Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA2_WEP40, 4);
break;
case Ndis802_11GroupWEP104Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA2_WEP104, 4);
break;
}
}
#endif // CONFIG_STA_SUPPORT //
// swap for big-endian platform
pRsnie_cipher->version = cpu2le16(pRsnie_cipher->version);
pRsnie_cipher->ucount = cpu2le16(pRsnie_cipher->ucount);
}
else
{
RSNIE *pRsnie_cipher = (RSNIE*)pRsnIe;
// Assign OUI and version
NdisMoveMemory(pRsnie_cipher->oui, OUI_WPA_VERSION, 4);
pRsnie_cipher->version = 1;
switch (WepStatus)
{
// TKIP mode
case Ndis802_11Encryption2Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA_TKIP, 4);
pRsnie_cipher->ucount = 1;
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA_TKIP, 4);
*rsn_len = sizeof(RSNIE);
break;
// AES mode
case Ndis802_11Encryption3Enabled:
if (bMixCipher)
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA_TKIP, 4);
else
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA_CCMP, 4);
pRsnie_cipher->ucount = 1;
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA_CCMP, 4);
*rsn_len = sizeof(RSNIE);
break;
// TKIP-AES mix mode
case Ndis802_11Encryption4Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA_TKIP, 4);
PairwiseCnt = 1;
// Insert WPA TKIP as the first pairwise cipher
if (MIX_CIPHER_WPA_TKIP_ON(FlexibleCipher))
{
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA_TKIP, 4);
// Insert WPA AES as the secondary pairwise cipher
if (MIX_CIPHER_WPA_AES_ON(FlexibleCipher))
{
NdisMoveMemory(pRsnie_cipher->ucast[0].oui + 4, OUI_WPA_CCMP, 4);
PairwiseCnt = 2;
}
}
else
{
// Insert WPA AES as the first pairwise cipher
NdisMoveMemory(pRsnie_cipher->ucast[0].oui, OUI_WPA_CCMP, 4);
}
pRsnie_cipher->ucount = PairwiseCnt;
*rsn_len = sizeof(RSNIE) + (4 * (PairwiseCnt - 1));
break;
}
#ifdef CONFIG_STA_SUPPORT
if ((pAd->OpMode == OPMODE_STA) &&
(pAd->StaCfg.GroupCipher != Ndis802_11Encryption2Enabled) &&
(pAd->StaCfg.GroupCipher != Ndis802_11Encryption3Enabled))
{
UINT GroupCipher = pAd->StaCfg.GroupCipher;
switch(GroupCipher)
{
case Ndis802_11GroupWEP40Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA_WEP40, 4);
break;
case Ndis802_11GroupWEP104Enabled:
NdisMoveMemory(pRsnie_cipher->mcast, OUI_WPA_WEP104, 4);
break;
}
}
#endif // CONFIG_STA_SUPPORT //
// swap for big-endian platform
pRsnie_cipher->version = cpu2le16(pRsnie_cipher->version);
pRsnie_cipher->ucount = cpu2le16(pRsnie_cipher->ucount);
}
}
/*
========================================================================
Routine Description:
Build AKM suite in RSN-IE.
It only shall be called by RTMPMakeRSNIE.
Arguments:
pAd - pointer to our pAdapter context
ElementID - indicate the WPA1 or WPA2
AuthMode - indicate the authentication mode
apidx - indicate the interface index
Return Value:
Note:
========================================================================
*/
static VOID RTMPInsertRsnIeAKM(
IN PRTMP_ADAPTER pAd,
IN UCHAR ElementID,
IN UINT AuthMode,
IN UCHAR apidx,
OUT PUCHAR pRsnIe,
OUT UCHAR *rsn_len)
{
RSNIE_AUTH *pRsnie_auth;
pRsnie_auth = (RSNIE_AUTH*)(pRsnIe + (*rsn_len));
// decide WPA2 or WPA1
if (ElementID == Wpa2Ie)
{
switch (AuthMode)
{
case Ndis802_11AuthModeWPA2:
case Ndis802_11AuthModeWPA1WPA2:
pRsnie_auth->acount = 1;
NdisMoveMemory(pRsnie_auth->auth[0].oui, OUI_WPA2_8021X_AKM, 4);
break;
case Ndis802_11AuthModeWPA2PSK:
case Ndis802_11AuthModeWPA1PSKWPA2PSK:
pRsnie_auth->acount = 1;
NdisMoveMemory(pRsnie_auth->auth[0].oui, OUI_WPA2_PSK_AKM, 4);
break;
}
}
else
{
switch (AuthMode)
{
case Ndis802_11AuthModeWPA:
case Ndis802_11AuthModeWPA1WPA2:
pRsnie_auth->acount = 1;
NdisMoveMemory(pRsnie_auth->auth[0].oui, OUI_WPA_8021X_AKM, 4);
break;
case Ndis802_11AuthModeWPAPSK:
case Ndis802_11AuthModeWPA1PSKWPA2PSK:
pRsnie_auth->acount = 1;
NdisMoveMemory(pRsnie_auth->auth[0].oui, OUI_WPA_PSK_AKM, 4);
break;
case Ndis802_11AuthModeWPANone:
pRsnie_auth->acount = 1;
NdisMoveMemory(pRsnie_auth->auth[0].oui, OUI_WPA_NONE_AKM, 4);
break;
}
}
pRsnie_auth->acount = cpu2le16(pRsnie_auth->acount);
(*rsn_len) += sizeof(RSNIE_AUTH); // update current RSNIE length
}
/*
========================================================================
Routine Description:
Build capability in RSN-IE.
It only shall be called by RTMPMakeRSNIE.
Arguments:
pAd - pointer to our pAdapter context
ElementID - indicate the WPA1 or WPA2
apidx - indicate the interface index
Return Value:
Note:
========================================================================
*/
static VOID RTMPInsertRsnIeCap(
IN PRTMP_ADAPTER pAd,
IN UCHAR ElementID,
IN UCHAR apidx,
OUT PUCHAR pRsnIe,
OUT UCHAR *rsn_len)
{
RSN_CAPABILITIES *pRSN_Cap;
// it could be ignored in WPA1 mode
if (ElementID == WpaIe)
return;
pRSN_Cap = (RSN_CAPABILITIES*)(pRsnIe + (*rsn_len));
pRSN_Cap->word = cpu2le16(pRSN_Cap->word);
(*rsn_len) += sizeof(RSN_CAPABILITIES); // update current RSNIE length
}
/*
========================================================================
Routine Description:
Build RSN IE context. It is not included element-ID and length.
Arguments:
pAd - pointer to our pAdapter context
AuthMode - indicate the authentication mode
WepStatus - indicate the encryption type
apidx - indicate the interface index
Return Value:
Note:
========================================================================
*/
VOID RTMPMakeRSNIE(
IN PRTMP_ADAPTER pAd,
IN UINT AuthMode,
IN UINT WepStatus,
IN UCHAR apidx)
{
PUCHAR pRsnIe = NULL; // primary RSNIE
UCHAR *rsnielen_cur_p = 0; // the length of the primary RSNIE
UCHAR *rsnielen_ex_cur_p = 0; // the length of the secondary RSNIE
UCHAR PrimaryRsnie;
BOOLEAN bMixCipher = FALSE; // indicate the pairwise and group cipher are different
UCHAR p_offset;
WPA_MIX_PAIR_CIPHER FlexibleCipher = MIX_CIPHER_NOTUSE; // it provide the more flexible cipher combination in WPA-WPA2 and TKIPAES mode
rsnielen_cur_p = NULL;
rsnielen_ex_cur_p = NULL;
{
#ifdef CONFIG_STA_SUPPORT
IF_DEV_CONFIG_OPMODE_ON_STA(pAd)
{
#ifdef WPA_SUPPLICANT_SUPPORT
if (pAd->StaCfg.WpaSupplicantUP != WPA_SUPPLICANT_DISABLE)
{
if (AuthMode < Ndis802_11AuthModeWPA)
return;
}
else
#endif // WPA_SUPPLICANT_SUPPORT //
{
// Support WPAPSK or WPA2PSK in STA-Infra mode
// Support WPANone in STA-Adhoc mode
if ((AuthMode != Ndis802_11AuthModeWPAPSK) &&
(AuthMode != Ndis802_11AuthModeWPA2PSK) &&
(AuthMode != Ndis802_11AuthModeWPANone)
)
return;
}
DBGPRINT(RT_DEBUG_TRACE,("==> RTMPMakeRSNIE(STA)\n"));
// Zero RSNIE context
pAd->StaCfg.RSNIE_Len = 0;
NdisZeroMemory(pAd->StaCfg.RSN_IE, MAX_LEN_OF_RSNIE);
// Pointer to RSNIE
rsnielen_cur_p = &pAd->StaCfg.RSNIE_Len;
pRsnIe = pAd->StaCfg.RSN_IE;
bMixCipher = pAd->StaCfg.bMixCipher;
}
#endif // CONFIG_STA_SUPPORT //
}
// indicate primary RSNIE as WPA or WPA2
if ((AuthMode == Ndis802_11AuthModeWPA) ||
(AuthMode == Ndis802_11AuthModeWPAPSK) ||
(AuthMode == Ndis802_11AuthModeWPANone) ||
(AuthMode == Ndis802_11AuthModeWPA1WPA2) ||
(AuthMode == Ndis802_11AuthModeWPA1PSKWPA2PSK))
PrimaryRsnie = WpaIe;
else
PrimaryRsnie = Wpa2Ie;
{
// Build the primary RSNIE
// 1. insert cipher suite
RTMPInsertRsnIeCipher(pAd, PrimaryRsnie, WepStatus, bMixCipher, FlexibleCipher, pRsnIe, &p_offset);
// 2. insert AKM
RTMPInsertRsnIeAKM(pAd, PrimaryRsnie, AuthMode, apidx, pRsnIe, &p_offset);
// 3. insert capability
RTMPInsertRsnIeCap(pAd, PrimaryRsnie, apidx, pRsnIe, &p_offset);
}
// 4. update the RSNIE length
*rsnielen_cur_p = p_offset;
hex_dump("The primary RSNIE", pRsnIe, (*rsnielen_cur_p));
}
/*
==========================================================================
Description:
Check whether the received frame is EAP frame.
Arguments:
pAd - pointer to our pAdapter context
pEntry - pointer to active entry
pData - the received frame
DataByteCount - the received frame's length
FromWhichBSSID - indicate the interface index
Return:
TRUE - This frame is EAP frame
FALSE - otherwise
==========================================================================
*/
BOOLEAN RTMPCheckWPAframe(
IN PRTMP_ADAPTER pAd,
IN PMAC_TABLE_ENTRY pEntry,
IN PUCHAR pData,
IN ULONG DataByteCount,
IN UCHAR FromWhichBSSID)
{
ULONG Body_len;
BOOLEAN Cancelled;
if(DataByteCount < (LENGTH_802_1_H + LENGTH_EAPOL_H))
return FALSE;
// Skip LLC header
if (NdisEqualMemory(SNAP_802_1H, pData, 6) ||
// Cisco 1200 AP may send packet with SNAP_BRIDGE_TUNNEL
NdisEqualMemory(SNAP_BRIDGE_TUNNEL, pData, 6))
{
pData += 6;
}
// Skip 2-bytes EAPoL type
if (NdisEqualMemory(EAPOL, pData, 2))
{
pData += 2;
}
else
return FALSE;
switch (*(pData+1))
{
case EAPPacket:
Body_len = (*(pData+2)<<8) | (*(pData+3));
DBGPRINT(RT_DEBUG_TRACE, ("Receive EAP-Packet frame, TYPE = 0, Length = %ld\n", Body_len));
break;
case EAPOLStart:
DBGPRINT(RT_DEBUG_TRACE, ("Receive EAPOL-Start frame, TYPE = 1 \n"));
if (pEntry->EnqueueEapolStartTimerRunning != EAPOL_START_DISABLE)
{
DBGPRINT(RT_DEBUG_TRACE, ("Cancel the EnqueueEapolStartTimerRunning \n"));
RTMPCancelTimer(&pEntry->EnqueueStartForPSKTimer, &Cancelled);
pEntry->EnqueueEapolStartTimerRunning = EAPOL_START_DISABLE;
}
break;
case EAPOLLogoff:
DBGPRINT(RT_DEBUG_TRACE, ("Receive EAPOLLogoff frame, TYPE = 2 \n"));
break;
case EAPOLKey:
Body_len = (*(pData+2)<<8) | (*(pData+3));
DBGPRINT(RT_DEBUG_TRACE, ("Receive EAPOL-Key frame, TYPE = 3, Length = %ld\n", Body_len));
break;
case EAPOLASFAlert:
DBGPRINT(RT_DEBUG_TRACE, ("Receive EAPOLASFAlert frame, TYPE = 4 \n"));
break;
default:
return FALSE;
}
return TRUE;
}
/*
==========================================================================
Description:
ENCRYPT AES GTK before sending in EAPOL frame.
AES GTK length = 128 bit, so fix blocks for aes-key-wrap as 2 in this function.
This function references to RFC 3394 for aes key wrap algorithm.
Return:
==========================================================================
*/
VOID AES_GTK_KEY_WRAP(
IN UCHAR *key,
IN UCHAR *plaintext,
IN UCHAR p_len,
OUT UCHAR *ciphertext)
{
UCHAR A[8], BIN[16], BOUT[16];
UCHAR R[512];
INT num_blocks = p_len/8; // unit:64bits
INT i, j;
aes_context aesctx;
UCHAR xor;
rtmp_aes_set_key(&aesctx, key, 128);
// Init IA
for (i = 0; i < 8; i++)
A[i] = 0xa6;
//Input plaintext
for (i = 0; i < num_blocks; i++)
{
for (j = 0 ; j < 8; j++)
R[8 * (i + 1) + j] = plaintext[8 * i + j];
}
// Key Mix
for (j = 0; j < 6; j++)
{
for(i = 1; i <= num_blocks; i++)
{
//phase 1
NdisMoveMemory(BIN, A, 8);
NdisMoveMemory(&BIN[8], &R[8 * i], 8);
rtmp_aes_encrypt(&aesctx, BIN, BOUT);
NdisMoveMemory(A, &BOUT[0], 8);
xor = num_blocks * j + i;
A[7] = BOUT[7] ^ xor;
NdisMoveMemory(&R[8 * i], &BOUT[8], 8);
}
}
// Output ciphertext
NdisMoveMemory(ciphertext, A, 8);
for (i = 1; i <= num_blocks; i++)
{
for (j = 0 ; j < 8; j++)
ciphertext[8 * i + j] = R[8 * i + j];
}
}
/*
========================================================================
Routine Description:
Misc function to decrypt AES body
Arguments:
Return Value:
Note:
This function references to RFC 3394 for aes key unwrap algorithm.
========================================================================
*/
VOID AES_GTK_KEY_UNWRAP(
IN UCHAR *key,
OUT UCHAR *plaintext,
IN UCHAR c_len,
IN UCHAR *ciphertext)
{
UCHAR A[8], BIN[16], BOUT[16];
UCHAR xor;
INT i, j;
aes_context aesctx;
UCHAR *R;
INT num_blocks = c_len/8; // unit:64bits
os_alloc_mem(NULL, (PUCHAR *)&R, 512);
if (R == NULL)
{
DBGPRINT(RT_DEBUG_ERROR, ("!!!AES_GTK_KEY_UNWRAP: no memory!!!\n"));
return;
} /* End of if */
// Initialize
NdisMoveMemory(A, ciphertext, 8);
//Input plaintext
for(i = 0; i < (c_len-8); i++)
{
R[ i] = ciphertext[i + 8];
}
rtmp_aes_set_key(&aesctx, key, 128);
for(j = 5; j >= 0; j--)
{
for(i = (num_blocks-1); i > 0; i--)
{
xor = (num_blocks -1 )* j + i;
NdisMoveMemory(BIN, A, 8);
BIN[7] = A[7] ^ xor;
NdisMoveMemory(&BIN[8], &R[(i-1)*8], 8);
rtmp_aes_decrypt(&aesctx, BIN, BOUT);
NdisMoveMemory(A, &BOUT[0], 8);
NdisMoveMemory(&R[(i-1)*8], &BOUT[8], 8);
}
}
// OUTPUT
for(i = 0; i < c_len; i++)
{
plaintext[i] = R[i];
}
os_free_mem(NULL, R);
}
/*
==========================================================================
Description:
Report the EAP message type
Arguments:
msg - EAPOL_PAIR_MSG_1
EAPOL_PAIR_MSG_2
EAPOL_PAIR_MSG_3
EAPOL_PAIR_MSG_4
EAPOL_GROUP_MSG_1
EAPOL_GROUP_MSG_2
Return:
message type string
==========================================================================
*/
CHAR *GetEapolMsgType(CHAR msg)
{
if(msg == EAPOL_PAIR_MSG_1)
return "Pairwise Message 1";
else if(msg == EAPOL_PAIR_MSG_2)
return "Pairwise Message 2";
else if(msg == EAPOL_PAIR_MSG_3)
return "Pairwise Message 3";
else if(msg == EAPOL_PAIR_MSG_4)
return "Pairwise Message 4";
else if(msg == EAPOL_GROUP_MSG_1)
return "Group Message 1";
else if(msg == EAPOL_GROUP_MSG_2)
return "Group Message 2";
else
return "Invalid Message";
}
/*
========================================================================
Routine Description:
Check Sanity RSN IE of EAPoL message
Arguments:
Return Value:
========================================================================
*/
BOOLEAN RTMPCheckRSNIE(
IN PRTMP_ADAPTER pAd,
IN PUCHAR pData,
IN UCHAR DataLen,
IN MAC_TABLE_ENTRY *pEntry,
OUT UCHAR *Offset)
{
PUCHAR pVIE;
UCHAR len;
PEID_STRUCT pEid;
BOOLEAN result = FALSE;
pVIE = pData;
len = DataLen;
*Offset = 0;
while (len > sizeof(RSNIE2))
{
pEid = (PEID_STRUCT) pVIE;
// WPA RSN IE
if ((pEid->Eid == IE_WPA) && (NdisEqualMemory(pEid->Octet, WPA_OUI, 4)))
{
if ((pEntry->AuthMode == Ndis802_11AuthModeWPA || pEntry->AuthMode == Ndis802_11AuthModeWPAPSK) &&
(NdisEqualMemory(pVIE, pEntry->RSN_IE, pEntry->RSNIE_Len)) &&
(pEntry->RSNIE_Len == (pEid->Len + 2)))
{
result = TRUE;
}
*Offset += (pEid->Len + 2);
}
// WPA2 RSN IE
else if ((pEid->Eid == IE_RSN) && (NdisEqualMemory(pEid->Octet + 2, RSN_OUI, 3)))
{
if ((pEntry->AuthMode == Ndis802_11AuthModeWPA2 || pEntry->AuthMode == Ndis802_11AuthModeWPA2PSK) &&
(NdisEqualMemory(pVIE, pEntry->RSN_IE, pEntry->RSNIE_Len)) &&
(pEntry->RSNIE_Len == (pEid->Len + 2))/* ToDo-AlbertY for mesh*/)
{
result = TRUE;
}
*Offset += (pEid->Len + 2);
}
else
{
break;
}
pVIE += (pEid->Len + 2);
len -= (pEid->Len + 2);
}
return result;
}
/*
========================================================================
Routine Description:
Parse KEYDATA field. KEYDATA[] May contain 2 RSN IE and optionally GTK.
GTK is encaptulated in KDE format at p.83 802.11i D10
Arguments:
Return Value:
Note:
802.11i D10
========================================================================
*/
BOOLEAN RTMPParseEapolKeyData(
IN PRTMP_ADAPTER pAd,
IN PUCHAR pKeyData,
IN UCHAR KeyDataLen,
IN UCHAR GroupKeyIndex,
IN UCHAR MsgType,
IN BOOLEAN bWPA2,
IN MAC_TABLE_ENTRY *pEntry)
{
PKDE_ENCAP pKDE = NULL;
PUCHAR pMyKeyData = pKeyData;
UCHAR KeyDataLength = KeyDataLen;
UCHAR GTKLEN = 0;
UCHAR DefaultIdx = 0;
UCHAR skip_offset;
// Verify The RSN IE contained in pairewise_msg_2 && pairewise_msg_3 and skip it
if (MsgType == EAPOL_PAIR_MSG_2 || MsgType == EAPOL_PAIR_MSG_3)
{
// Check RSN IE whether it is WPA2/WPA2PSK
if (!RTMPCheckRSNIE(pAd, pKeyData, KeyDataLen, pEntry, &skip_offset))
{
// send wireless event - for RSN IE different
if (pAd->CommonCfg.bWirelessEvent)
RTMPSendWirelessEvent(pAd, IW_RSNIE_DIFF_EVENT_FLAG, pEntry->Addr, pEntry->apidx, 0);
DBGPRINT(RT_DEBUG_ERROR, ("RSN_IE Different in msg %d of 4-way handshake!\n", MsgType));
hex_dump("Receive RSN_IE ", pKeyData, KeyDataLen);
hex_dump("Desired RSN_IE ", pEntry->RSN_IE, pEntry->RSNIE_Len);
return FALSE;
}
else
{
if (bWPA2 && MsgType == EAPOL_PAIR_MSG_3)
{
// skip RSN IE
pMyKeyData += skip_offset;
KeyDataLength -= skip_offset;
DBGPRINT(RT_DEBUG_TRACE, ("RTMPParseEapolKeyData ==> WPA2/WPA2PSK RSN IE matched in Msg 3, Length(%d) \n", skip_offset));
}
else
return TRUE;
}
}
DBGPRINT(RT_DEBUG_TRACE,("RTMPParseEapolKeyData ==> KeyDataLength %d without RSN_IE \n", KeyDataLength));
// Parse EKD format in pairwise_msg_3_WPA2 && group_msg_1_WPA2
if (bWPA2 && (MsgType == EAPOL_PAIR_MSG_3 || MsgType == EAPOL_GROUP_MSG_1))
{
if (KeyDataLength >= 8) // KDE format exclude GTK length
{
pKDE = (PKDE_ENCAP) pMyKeyData;
DefaultIdx = pKDE->GTKEncap.Kid;
// Sanity check - KED length
if (KeyDataLength < (pKDE->Len + 2))
{
DBGPRINT(RT_DEBUG_ERROR, ("ERROR: The len from KDE is too short \n"));
return FALSE;
}
// Get GTK length - refer to IEEE 802.11i-2004 p.82
GTKLEN = pKDE->Len -6;
if (GTKLEN < LEN_AES_KEY)
{
DBGPRINT(RT_DEBUG_ERROR, ("ERROR: GTK Key length is too short (%d) \n", GTKLEN));
return FALSE;
}
}
else
{
DBGPRINT(RT_DEBUG_ERROR, ("ERROR: KDE format length is too short \n"));
return FALSE;
}
DBGPRINT(RT_DEBUG_TRACE, ("GTK in KDE format ,DefaultKeyID=%d, KeyLen=%d \n", DefaultIdx, GTKLEN));
// skip it
pMyKeyData += 8;
KeyDataLength -= 8;
}
else if (!bWPA2 && MsgType == EAPOL_GROUP_MSG_1)
{
DefaultIdx = GroupKeyIndex;
DBGPRINT(RT_DEBUG_TRACE, ("GTK DefaultKeyID=%d \n", DefaultIdx));
}
// Sanity check - shared key index must be 1 ~ 3
if (DefaultIdx < 1 || DefaultIdx > 3)
{
DBGPRINT(RT_DEBUG_ERROR, ("ERROR: GTK Key index(%d) is invalid in %s %s \n", DefaultIdx, ((bWPA2) ? "WPA2" : "WPA"), GetEapolMsgType(MsgType)));
return FALSE;
}
#ifdef CONFIG_STA_SUPPORT
// Todo
#endif // CONFIG_STA_SUPPORT //
return TRUE;
}
/*
========================================================================
Routine Description:
Construct EAPoL message for WPA handshaking
Its format is below,
+--------------------+
| Protocol Version | 1 octet
+--------------------+
| Protocol Type | 1 octet
+--------------------+
| Body Length | 2 octets
+--------------------+
| Descriptor Type | 1 octet
+--------------------+
| Key Information | 2 octets
+--------------------+
| Key Length | 1 octet
+--------------------+
| Key Repaly Counter | 8 octets
+--------------------+
| Key Nonce | 32 octets
+--------------------+
| Key IV | 16 octets
+--------------------+
| Key RSC | 8 octets
+--------------------+
| Key ID or Reserved | 8 octets
+--------------------+
| Key MIC | 16 octets
+--------------------+
| Key Data Length | 2 octets
+--------------------+
| Key Data | n octets
+--------------------+
Arguments:
pAd Pointer to our adapter
Return Value:
None
Note:
========================================================================
*/
VOID ConstructEapolMsg(
IN PRTMP_ADAPTER pAd,
IN UCHAR AuthMode,
IN UCHAR WepStatus,
IN UCHAR GroupKeyWepStatus,
IN UCHAR MsgType,
IN UCHAR DefaultKeyIdx,
IN UCHAR *ReplayCounter,
IN UCHAR *KeyNonce,
IN UCHAR *TxRSC,
IN UCHAR *PTK,
IN UCHAR *GTK,
IN UCHAR *RSNIE,
IN UCHAR RSNIE_Len,
OUT PEAPOL_PACKET pMsg)
{
BOOLEAN bWPA2 = FALSE;
// Choose WPA2 or not
if ((AuthMode == Ndis802_11AuthModeWPA2) || (AuthMode == Ndis802_11AuthModeWPA2PSK))
bWPA2 = TRUE;
// Init Packet and Fill header
pMsg->ProVer = EAPOL_VER;
pMsg->ProType = EAPOLKey;
// Default 95 bytes, the EAPoL-Key descriptor exclude Key-data field
pMsg->Body_Len[1] = LEN_EAPOL_KEY_MSG;
// Fill in EAPoL descriptor
if (bWPA2)
pMsg->KeyDesc.Type = WPA2_KEY_DESC;
else
pMsg->KeyDesc.Type = WPA1_KEY_DESC;
// Fill in Key information, refer to IEEE Std 802.11i-2004 page 78
// When either the pairwise or the group cipher is AES, the DESC_TYPE_AES(2) shall be used.
pMsg->KeyDesc.KeyInfo.KeyDescVer =
(((WepStatus == Ndis802_11Encryption3Enabled) || (GroupKeyWepStatus == Ndis802_11Encryption3Enabled)) ? (DESC_TYPE_AES) : (DESC_TYPE_TKIP));
// Specify Key Type as Group(0) or Pairwise(1)
if (MsgType >= EAPOL_GROUP_MSG_1)
pMsg->KeyDesc.KeyInfo.KeyType = GROUPKEY;
else
pMsg->KeyDesc.KeyInfo.KeyType = PAIRWISEKEY;
// Specify Key Index, only group_msg1_WPA1
if (!bWPA2 && (MsgType >= EAPOL_GROUP_MSG_1))
pMsg->KeyDesc.KeyInfo.KeyIndex = DefaultKeyIdx;
if (MsgType == EAPOL_PAIR_MSG_3)
pMsg->KeyDesc.KeyInfo.Install = 1;
if ((MsgType == EAPOL_PAIR_MSG_1) || (MsgType == EAPOL_PAIR_MSG_3) || (MsgType == EAPOL_GROUP_MSG_1))
pMsg->KeyDesc.KeyInfo.KeyAck = 1;
if (MsgType != EAPOL_PAIR_MSG_1)
pMsg->KeyDesc.KeyInfo.KeyMic = 1;
if ((bWPA2 && (MsgType >= EAPOL_PAIR_MSG_3)) || (!bWPA2 && (MsgType >= EAPOL_GROUP_MSG_1)))
{
pMsg->KeyDesc.KeyInfo.Secure = 1;
}
if (bWPA2 && ((MsgType == EAPOL_PAIR_MSG_3) || (MsgType == EAPOL_GROUP_MSG_1)))
{
pMsg->KeyDesc.KeyInfo.EKD_DL = 1;
}
// key Information element has done.
*(USHORT *)(&pMsg->KeyDesc.KeyInfo) = cpu2le16(*(USHORT *)(&pMsg->KeyDesc.KeyInfo));
// Fill in Key Length
{
if (MsgType >= EAPOL_GROUP_MSG_1)
{
// the length of group key cipher
pMsg->KeyDesc.KeyLength[1] = ((GroupKeyWepStatus == Ndis802_11Encryption2Enabled) ? TKIP_GTK_LENGTH : LEN_AES_KEY);
}
else
{
// the length of pairwise key cipher
pMsg->KeyDesc.KeyLength[1] = ((WepStatus == Ndis802_11Encryption2Enabled) ? LEN_TKIP_KEY : LEN_AES_KEY);
}
}
// Fill in replay counter
NdisMoveMemory(pMsg->KeyDesc.ReplayCounter, ReplayCounter, LEN_KEY_DESC_REPLAY);
// Fill Key Nonce field
// ANonce : pairwise_msg1 & pairwise_msg3
// SNonce : pairwise_msg2
// GNonce : group_msg1_wpa1
if ((MsgType <= EAPOL_PAIR_MSG_3) || ((!bWPA2 && (MsgType == EAPOL_GROUP_MSG_1))))
NdisMoveMemory(pMsg->KeyDesc.KeyNonce, KeyNonce, LEN_KEY_DESC_NONCE);
// Fill key IV - WPA2 as 0, WPA1 as random
if (!bWPA2 && (MsgType == EAPOL_GROUP_MSG_1))
{
// Suggest IV be random number plus some number,
NdisMoveMemory(pMsg->KeyDesc.KeyIv, &KeyNonce[16], LEN_KEY_DESC_IV);
pMsg->KeyDesc.KeyIv[15] += 2;
}
// Fill Key RSC field
// It contains the RSC for the GTK being installed.
if ((MsgType == EAPOL_PAIR_MSG_3 && bWPA2) || (MsgType == EAPOL_GROUP_MSG_1))
{
NdisMoveMemory(pMsg->KeyDesc.KeyRsc, TxRSC, 6);
}
// Clear Key MIC field for MIC calculation later
NdisZeroMemory(pMsg->KeyDesc.KeyMic, LEN_KEY_DESC_MIC);
ConstructEapolKeyData(pAd,
AuthMode,
WepStatus,
GroupKeyWepStatus,
MsgType,
DefaultKeyIdx,
bWPA2,
PTK,
GTK,
RSNIE,
RSNIE_Len,
pMsg);
// Calculate MIC and fill in KeyMic Field except Pairwise Msg 1.
if (MsgType != EAPOL_PAIR_MSG_1)
{
CalculateMIC(pAd, WepStatus, PTK, pMsg);
}
DBGPRINT(RT_DEBUG_TRACE, ("===> ConstructEapolMsg for %s %s\n", ((bWPA2) ? "WPA2" : "WPA"), GetEapolMsgType(MsgType)));
DBGPRINT(RT_DEBUG_TRACE, (" Body length = %d \n", pMsg->Body_Len[1]));
DBGPRINT(RT_DEBUG_TRACE, (" Key length = %d \n", pMsg->KeyDesc.KeyLength[1]));
}
/*
========================================================================
Routine Description:
Construct the Key Data field of EAPoL message
Arguments:
pAd Pointer to our adapter
Elem Message body
Return Value:
None
Note:
========================================================================
*/
VOID ConstructEapolKeyData(
IN PRTMP_ADAPTER pAd,
IN UCHAR AuthMode,
IN UCHAR WepStatus,
IN UCHAR GroupKeyWepStatus,
IN UCHAR MsgType,
IN UCHAR DefaultKeyIdx,
IN BOOLEAN bWPA2Capable,
IN UCHAR *PTK,
IN UCHAR *GTK,
IN UCHAR *RSNIE,
IN UCHAR RSNIE_LEN,
OUT PEAPOL_PACKET pMsg)
{
UCHAR *mpool, *Key_Data, *Rc4GTK;
UCHAR ekey[(LEN_KEY_DESC_IV+LEN_EAP_EK)];
UCHAR data_offset;
if (MsgType == EAPOL_PAIR_MSG_1 || MsgType == EAPOL_PAIR_MSG_4 || MsgType == EAPOL_GROUP_MSG_2)
return;
// allocate memory pool
os_alloc_mem(pAd, (PUCHAR *)&mpool, 1500);
if (mpool == NULL)
return;
/* Rc4GTK Len = 512 */
Rc4GTK = (UCHAR *) ROUND_UP(mpool, 4);
/* Key_Data Len = 512 */
Key_Data = (UCHAR *) ROUND_UP(Rc4GTK + 512, 4);
NdisZeroMemory(Key_Data, 512);
pMsg->KeyDesc.KeyDataLen[1] = 0;
data_offset = 0;
// Encapsulate RSNIE in pairwise_msg2 & pairwise_msg3
if (RSNIE_LEN && ((MsgType == EAPOL_PAIR_MSG_2) || (MsgType == EAPOL_PAIR_MSG_3)))
{
if (bWPA2Capable)
Key_Data[data_offset + 0] = IE_WPA2;
else
Key_Data[data_offset + 0] = IE_WPA;
Key_Data[data_offset + 1] = RSNIE_LEN;
NdisMoveMemory(&Key_Data[data_offset + 2], RSNIE, RSNIE_LEN);
data_offset += (2 + RSNIE_LEN);
}
// Encapsulate KDE format in pairwise_msg3_WPA2 & group_msg1_WPA2
if (bWPA2Capable && ((MsgType == EAPOL_PAIR_MSG_3) || (MsgType == EAPOL_GROUP_MSG_1)))
{
// Key Data Encapsulation (KDE) format - 802.11i-2004 Figure-43w and Table-20h
Key_Data[data_offset + 0] = 0xDD;
if (GroupKeyWepStatus == Ndis802_11Encryption3Enabled)
{
Key_Data[data_offset + 1] = 0x16;// 4+2+16(OUI+DataType+DataField)
}
else
{
Key_Data[data_offset + 1] = 0x26;// 4+2+32(OUI+DataType+DataField)
}
Key_Data[data_offset + 2] = 0x00;
Key_Data[data_offset + 3] = 0x0F;
Key_Data[data_offset + 4] = 0xAC;
Key_Data[data_offset + 5] = 0x01;
// GTK KDE format - 802.11i-2004 Figure-43x
Key_Data[data_offset + 6] = (DefaultKeyIdx & 0x03);
Key_Data[data_offset + 7] = 0x00; // Reserved Byte
data_offset += 8;
}
// Encapsulate GTK and encrypt the key-data field with KEK.
// Only for pairwise_msg3_WPA2 and group_msg1
if ((MsgType == EAPOL_PAIR_MSG_3 && bWPA2Capable) || (MsgType == EAPOL_GROUP_MSG_1))
{
// Fill in GTK
if (GroupKeyWepStatus == Ndis802_11Encryption3Enabled)
{
NdisMoveMemory(&Key_Data[data_offset], GTK, LEN_AES_KEY);
data_offset += LEN_AES_KEY;
}
else
{
NdisMoveMemory(&Key_Data[data_offset], GTK, TKIP_GTK_LENGTH);
data_offset += TKIP_GTK_LENGTH;
}
// Still dont know why, but if not append will occur "GTK not include in MSG3"
// Patch for compatibility between zero config and funk
if (MsgType == EAPOL_PAIR_MSG_3 && bWPA2Capable)
{
if (GroupKeyWepStatus == Ndis802_11Encryption3Enabled)
{
Key_Data[data_offset + 0] = 0xDD;
Key_Data[data_offset + 1] = 0;
data_offset += 2;
}
else
{
Key_Data[data_offset + 0] = 0xDD;
Key_Data[data_offset + 1] = 0;
Key_Data[data_offset + 2] = 0;
Key_Data[data_offset + 3] = 0;
Key_Data[data_offset + 4] = 0;
Key_Data[data_offset + 5] = 0;
data_offset += 6;
}
}
// Encrypt the data material in key data field
if (WepStatus == Ndis802_11Encryption3Enabled)
{
AES_GTK_KEY_WRAP(&PTK[16], Key_Data, data_offset, Rc4GTK);
// AES wrap function will grow 8 bytes in length
data_offset += 8;
}
else
{
// PREPARE Encrypted "Key DATA" field. (Encrypt GTK with RC4, usinf PTK[16]->[31] as Key, IV-field as IV)
// put TxTsc in Key RSC field
pAd->PrivateInfo.FCSCRC32 = PPPINITFCS32; //Init crc32.
// ekey is the contanetion of IV-field, and PTK[16]->PTK[31]
NdisMoveMemory(ekey, pMsg->KeyDesc.KeyIv, LEN_KEY_DESC_IV);
NdisMoveMemory(&ekey[LEN_KEY_DESC_IV], &PTK[16], LEN_EAP_EK);
ARCFOUR_INIT(&pAd->PrivateInfo.WEPCONTEXT, ekey, sizeof(ekey)); //INIT SBOX, KEYLEN+3(IV)
pAd->PrivateInfo.FCSCRC32 = RTMP_CALC_FCS32(pAd->PrivateInfo.FCSCRC32, Key_Data, data_offset);
WPAARCFOUR_ENCRYPT(&pAd->PrivateInfo.WEPCONTEXT, Rc4GTK, Key_Data, data_offset);
}
NdisMoveMemory(pMsg->KeyDesc.KeyData, Rc4GTK, data_offset);
}
else
{
NdisMoveMemory(pMsg->KeyDesc.KeyData, Key_Data, data_offset);
}
// set key data length field and total length
pMsg->KeyDesc.KeyDataLen[1] = data_offset;
pMsg->Body_Len[1] += data_offset;
os_free_mem(pAd, mpool);
}
/*
========================================================================
Routine Description:
Calcaulate MIC. It is used during 4-ways handsharking.
Arguments:
pAd - pointer to our pAdapter context
PeerWepStatus - indicate the encryption type
Return Value:
Note:
========================================================================
*/
VOID CalculateMIC(
IN PRTMP_ADAPTER pAd,
IN UCHAR PeerWepStatus,
IN UCHAR *PTK,
OUT PEAPOL_PACKET pMsg)
{
UCHAR *OutBuffer;
ULONG FrameLen = 0;
UCHAR mic[LEN_KEY_DESC_MIC];
UCHAR digest[80];
// allocate memory for MIC calculation
os_alloc_mem(pAd, (PUCHAR *)&OutBuffer, 512);
if (OutBuffer == NULL)
{
DBGPRINT(RT_DEBUG_ERROR, ("!!!CalculateMIC: no memory!!!\n"));
return;
}
// make a frame for calculating MIC.
MakeOutgoingFrame(OutBuffer, &FrameLen,
pMsg->Body_Len[1] + 4, pMsg,
END_OF_ARGS);
NdisZeroMemory(mic, sizeof(mic));
// Calculate MIC
if (PeerWepStatus == Ndis802_11Encryption3Enabled)
{
HMAC_SHA1(OutBuffer, FrameLen, PTK, LEN_EAP_MICK, digest);
NdisMoveMemory(mic, digest, LEN_KEY_DESC_MIC);
}
else
{
hmac_md5(PTK, LEN_EAP_MICK, OutBuffer, FrameLen, mic);
}
// store the calculated MIC
NdisMoveMemory(pMsg->KeyDesc.KeyMic, mic, LEN_KEY_DESC_MIC);
os_free_mem(pAd, OutBuffer);
}
/*
========================================================================
Routine Description:
Some received frames can't decrypt by Asic, so decrypt them by software.
Arguments:
pAd - pointer to our pAdapter context
PeerWepStatus - indicate the encryption type
Return Value:
NDIS_STATUS_SUCCESS - decryption successful
NDIS_STATUS_FAILURE - decryption failure
========================================================================
*/
NDIS_STATUS RTMPSoftDecryptBroadCastData(
IN PRTMP_ADAPTER pAd,
IN RX_BLK *pRxBlk,
IN NDIS_802_11_ENCRYPTION_STATUS GroupCipher,
IN PCIPHER_KEY pShard_key)
{
PRXWI_STRUC pRxWI = pRxBlk->pRxWI;
// handle WEP decryption
if (GroupCipher == Ndis802_11Encryption1Enabled)
{
if (RTMPSoftDecryptWEP(pAd, pRxBlk->pData, pRxWI->MPDUtotalByteCount, pShard_key))
{
//Minus IV[4] & ICV[4]
pRxWI->MPDUtotalByteCount -= 8;
}
else
{
DBGPRINT(RT_DEBUG_ERROR, ("ERROR : Software decrypt WEP data fails.\n"));
// give up this frame
return NDIS_STATUS_FAILURE;
}
}
// handle TKIP decryption
else if (GroupCipher == Ndis802_11Encryption2Enabled)
{
if (RTMPSoftDecryptTKIP(pAd, pRxBlk->pData, pRxWI->MPDUtotalByteCount, 0, pShard_key))
{
//Minus 8 bytes MIC, 8 bytes IV/EIV, 4 bytes ICV
pRxWI->MPDUtotalByteCount -= 20;
}
else
{
DBGPRINT(RT_DEBUG_ERROR, ("ERROR : RTMPSoftDecryptTKIP Failed\n"));
// give up this frame
return NDIS_STATUS_FAILURE;
}
}
// handle AES decryption
else if (GroupCipher == Ndis802_11Encryption3Enabled)
{
if (RTMPSoftDecryptAES(pAd, pRxBlk->pData, pRxWI->MPDUtotalByteCount , pShard_key))
{
//8 bytes MIC, 8 bytes IV/EIV (CCMP Header)
pRxWI->MPDUtotalByteCount -= 16;
}
else
{
DBGPRINT(RT_DEBUG_ERROR, ("ERROR : RTMPSoftDecryptAES Failed\n"));
// give up this frame
return NDIS_STATUS_FAILURE;
}
}
else
{
// give up this frame
return NDIS_STATUS_FAILURE;
}
return NDIS_STATUS_SUCCESS;
}
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