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wpa.c
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1 /*
2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
3  * All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  *
20  * File: wpa.c
21  *
22  * Purpose: Handles the Basic Service Set & Node Database functions
23  *
24  * Functions:
25  * WPA_ParseRSN - Parse RSN IE.
26  *
27  * Revision History:
28  *
29  * Author: Kyle Hsu
30  *
31  * Date: July 14, 2003
32  *
33  */
34 
35 #include "ttype.h"
36 #include "tmacro.h"
37 #include "tether.h"
38 #include "device.h"
39 #include "80211hdr.h"
40 #include "bssdb.h"
41 #include "wmgr.h"
42 #include "wpa.h"
43 #include "80211mgr.h"
44 
45 /*--------------------- Static Variables --------------------------*/
46 static int msglevel =MSG_LEVEL_INFO;
47 
48 const unsigned char abyOUI00[4] = { 0x00, 0x50, 0xf2, 0x00 };
49 const unsigned char abyOUI01[4] = { 0x00, 0x50, 0xf2, 0x01 };
50 const unsigned char abyOUI02[4] = { 0x00, 0x50, 0xf2, 0x02 };
51 const unsigned char abyOUI03[4] = { 0x00, 0x50, 0xf2, 0x03 };
52 const unsigned char abyOUI04[4] = { 0x00, 0x50, 0xf2, 0x04 };
53 const unsigned char abyOUI05[4] = { 0x00, 0x50, 0xf2, 0x05 };
54 
55 
56 /*+
57  *
58  * Description:
59  * Clear RSN information in BSSList.
60  *
61  * Parameters:
62  * In:
63  * pBSSList - BSS list.
64  * Out:
65  * none
66  *
67  * Return Value: none.
68  *
69 -*/
70 
71 void
73  PKnownBSS pBSSList
74  )
75 {
76  int ii;
77  pBSSList->byGKType = WPA_TKIP;
78  for (ii=0; ii < 4; ii ++)
79  pBSSList->abyPKType[ii] = WPA_TKIP;
80  pBSSList->wPKCount = 0;
81  for (ii=0; ii < 4; ii ++)
82  pBSSList->abyAuthType[ii] = WPA_AUTH_IEEE802_1X;
83  pBSSList->wAuthCount = 0;
84  pBSSList->byDefaultK_as_PK = 0;
85  pBSSList->byReplayIdx = 0;
86  pBSSList->sRSNCapObj.bRSNCapExist = false;
87  pBSSList->sRSNCapObj.wRSNCap = 0;
88  pBSSList->bWPAValid = false;
89 }
90 
91 
92 /*+
93  *
94  * Description:
95  * Parse RSN IE.
96  *
97  * Parameters:
98  * In:
99  * pBSSList - BSS list.
100  * pRSN - Pointer to the RSN IE.
101  * Out:
102  * none
103  *
104  * Return Value: none.
105  *
106 -*/
107 void
109  PKnownBSS pBSSList,
110  PWLAN_IE_RSN_EXT pRSN
111  )
112 {
113  PWLAN_IE_RSN_AUTH pIE_RSN_Auth = NULL;
114  int i, j, m, n = 0;
115  unsigned char *pbyCaps;
116 
117  WPA_ClearRSN(pBSSList);
118 
119  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"WPA_ParseRSN: [%d]\n", pRSN->len);
120 
121  // information element header makes sense
122  if ((pRSN->len >= 6) // oui1(4)+ver(2)
123  && (pRSN->byElementID == WLAN_EID_RSN_WPA) && !memcmp(pRSN->abyOUI, abyOUI01, 4)
124  && (pRSN->wVersion == 1)) {
125 
126  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"Legal RSN\n");
127  // update each variable if pRSN is long enough to contain the variable
128  if (pRSN->len >= 10) //oui1(4)+ver(2)+GKSuite(4)
129  {
130  if ( !memcmp(pRSN->abyMulticast, abyOUI01, 4))
131  pBSSList->byGKType = WPA_WEP40;
132  else if ( !memcmp(pRSN->abyMulticast, abyOUI02, 4))
133  pBSSList->byGKType = WPA_TKIP;
134  else if ( !memcmp(pRSN->abyMulticast, abyOUI03, 4))
135  pBSSList->byGKType = WPA_AESWRAP;
136  else if ( !memcmp(pRSN->abyMulticast, abyOUI04, 4))
137  pBSSList->byGKType = WPA_AESCCMP;
138  else if ( !memcmp(pRSN->abyMulticast, abyOUI05, 4))
139  pBSSList->byGKType = WPA_WEP104;
140  else
141  // any vendor checks here
142  pBSSList->byGKType = WPA_NONE;
143 
144  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"byGKType: %x\n", pBSSList->byGKType);
145  }
146 
147  if (pRSN->len >= 12) //oui1(4)+ver(2)+GKS(4)+PKSCnt(2)
148  {
149  j = 0;
150  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"wPKCount: %d, sizeof(pBSSList->abyPKType): %zu\n", pRSN->wPKCount, sizeof(pBSSList->abyPKType));
151  for(i = 0; (i < pRSN->wPKCount) && (j < ARRAY_SIZE(pBSSList->abyPKType)); i++) {
152  if(pRSN->len >= 12+i*4+4) { //oui1(4)+ver(2)+GKS(4)+PKSCnt(2)+PKS(4*i)
153  if ( !memcmp(pRSN->PKSList[i].abyOUI, abyOUI00, 4))
154  pBSSList->abyPKType[j++] = WPA_NONE;
155  else if ( !memcmp(pRSN->PKSList[i].abyOUI, abyOUI02, 4))
156  pBSSList->abyPKType[j++] = WPA_TKIP;
157  else if ( !memcmp(pRSN->PKSList[i].abyOUI, abyOUI03, 4))
158  pBSSList->abyPKType[j++] = WPA_AESWRAP;
159  else if ( !memcmp(pRSN->PKSList[i].abyOUI, abyOUI04, 4))
160  pBSSList->abyPKType[j++] = WPA_AESCCMP;
161  else
162  // any vendor checks here
163  ;
164  }
165  else
166  break;
167  //DBG_PRN_GRP14(("abyPKType[%d]: %X\n", j-1, pBSSList->abyPKType[j-1]));
168  } //for
169  pBSSList->wPKCount = (unsigned short)j;
170  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"wPKCount: %d\n", pBSSList->wPKCount);
171  }
172 
173  m = pRSN->wPKCount;
174  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"m: %d\n", m);
175  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"14+m*4: %d\n", 14+m*4);
176 
177  if (pRSN->len >= 14+m*4) { //oui1(4)+ver(2)+GKS(4)+PKSCnt(2)+PKS(4*m)+AKC(2)
178  // overlay IE_RSN_Auth structure into correct place
179  pIE_RSN_Auth = (PWLAN_IE_RSN_AUTH) pRSN->PKSList[m].abyOUI;
180  j = 0;
181  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"wAuthCount: %d, sizeof(pBSSList->abyAuthType): %zu\n",
182  pIE_RSN_Auth->wAuthCount, sizeof(pBSSList->abyAuthType));
183  for(i = 0; (i < pIE_RSN_Auth->wAuthCount) && (j < ARRAY_SIZE(pBSSList->abyAuthType)); i++) {
184  if(pRSN->len >= 14+4+(m+i)*4) { //oui1(4)+ver(2)+GKS(4)+PKSCnt(2)+PKS(4*m)+AKC(2)+AKS(4*i)
185  if ( !memcmp(pIE_RSN_Auth->AuthKSList[i].abyOUI, abyOUI01, 4))
186  pBSSList->abyAuthType[j++] = WPA_AUTH_IEEE802_1X;
187  else if ( !memcmp(pIE_RSN_Auth->AuthKSList[i].abyOUI, abyOUI02, 4))
188  pBSSList->abyAuthType[j++] = WPA_AUTH_PSK;
189  else
190  // any vendor checks here
191  ;
192  }
193  else
194  break;
195  //DBG_PRN_GRP14(("abyAuthType[%d]: %X\n", j-1, pBSSList->abyAuthType[j-1]));
196  }
197  if(j > 0)
198  pBSSList->wAuthCount = (unsigned short)j;
199  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"wAuthCount: %d\n", pBSSList->wAuthCount);
200  }
201 
202  if (pIE_RSN_Auth != NULL) {
203 
204  n = pIE_RSN_Auth->wAuthCount;
205 
206  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"n: %d\n", n);
207  DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"14+4+(m+n)*4: %d\n", 14+4+(m+n)*4);
208 
209  if(pRSN->len+2 >= 14+4+(m+n)*4) { //oui1(4)+ver(2)+GKS(4)+PKSCnt(2)+PKS(4*m)+AKC(2)+AKS(4*n)+Cap(2)
210  pbyCaps = (unsigned char *)pIE_RSN_Auth->AuthKSList[n].abyOUI;
211  pBSSList->byDefaultK_as_PK = (*pbyCaps) & WPA_GROUPFLAG;
212  pBSSList->byReplayIdx = 2 << ((*pbyCaps >> WPA_REPLAYBITSSHIFT) & WPA_REPLAYBITS);
213  pBSSList->sRSNCapObj.bRSNCapExist = true;
214  pBSSList->sRSNCapObj.wRSNCap = *(unsigned short *)pbyCaps;
215  //DBG_PRN_GRP14(("pbyCaps: %X\n", *pbyCaps));
216  //DBG_PRN_GRP14(("byDefaultK_as_PK: %X\n", pBSSList->byDefaultK_as_PK));
217  //DBG_PRN_GRP14(("byReplayIdx: %X\n", pBSSList->byReplayIdx));
218  }
219  }
220  pBSSList->bWPAValid = true;
221  }
222 }
223 
224 /*+
225  *
226  * Description:
227  * Search RSN information in BSSList.
228  *
229  * Parameters:
230  * In:
231  * byCmd - Search type
232  * byEncrypt- Encrypt Type
233  * pBSSList - BSS list
234  * Out:
235  * none
236  *
237  * Return Value: none.
238  *
239 -*/
240 bool
242  unsigned char byCmd,
243  unsigned char byEncrypt,
244  PKnownBSS pBSSList
245  )
246 {
247  int ii;
248  unsigned char byPKType = WPA_NONE;
249 
250  if (pBSSList->bWPAValid == false)
251  return false;
252 
253  switch(byCmd) {
254  case 0:
255 
256  if (byEncrypt != pBSSList->byGKType)
257  return false;
258 
259  if (pBSSList->wPKCount > 0) {
260  for (ii = 0; ii < pBSSList->wPKCount; ii ++) {
261  if (pBSSList->abyPKType[ii] == WPA_AESCCMP)
262  byPKType = WPA_AESCCMP;
263  else if ((pBSSList->abyPKType[ii] == WPA_TKIP) && (byPKType != WPA_AESCCMP))
264  byPKType = WPA_TKIP;
265  else if ((pBSSList->abyPKType[ii] == WPA_WEP40) && (byPKType != WPA_AESCCMP) && (byPKType != WPA_TKIP))
266  byPKType = WPA_WEP40;
267  else if ((pBSSList->abyPKType[ii] == WPA_WEP104) && (byPKType != WPA_AESCCMP) && (byPKType != WPA_TKIP))
268  byPKType = WPA_WEP104;
269  }
270  if (byEncrypt != byPKType)
271  return false;
272  }
273  return true;
274 // if (pBSSList->wAuthCount > 0)
275 // for (ii=0; ii < pBSSList->wAuthCount; ii ++)
276 // if (byAuth == pBSSList->abyAuthType[ii])
277 // break;
278  break;
279 
280  default:
281  break;
282  }
283  return false;
284 }
285 
286 /*+
287  *
288  * Description:
289  * Check if RSN IE makes sense.
290  *
291  * Parameters:
292  * In:
293  * pRSN - Pointer to the RSN IE.
294  * Out:
295  * none
296  *
297  * Return Value: none.
298  *
299 -*/
300 bool
302  PWLAN_IE_RSN_EXT pRSN
303  )
304 {
305  if (pRSN == NULL)
306  return false;
307 
308  if ((pRSN->len >= 6) && // oui1(4)+ver(2)
309  (pRSN->byElementID == WLAN_EID_RSN_WPA) && !memcmp(pRSN->abyOUI, abyOUI01, 4) &&
310  (pRSN->wVersion == 1)) {
311  return true;
312  }
313  else
314  return false;
315 }
316