summaryrefslogtreecommitdiffstats
path: root/net/ieee80211/softmac/ieee80211softmac_auth.c
blob: 855fa0fe641bc8bbe65854f824523490992daf0b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
/*
 * This file contains the softmac's authentication logic.
 *
 * Copyright (c) 2005, 2006 Johannes Berg <johannes@sipsolutions.net>
 *                          Joseph Jezak <josejx@gentoo.org>
 *                          Larry Finger <Larry.Finger@lwfinger.net>
 *                          Danny van Dyk <kugelfang@gentoo.org>
 *                          Michael Buesch <mbuesch@freenet.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called COPYING.
 */

#include "ieee80211softmac_priv.h"

static void ieee80211softmac_auth_queue(struct work_struct *work);

/* Queues an auth request to the desired AP */
int
ieee80211softmac_auth_req(struct ieee80211softmac_device *mac,
	struct ieee80211softmac_network *net)
{
	struct ieee80211softmac_auth_queue_item *auth;
	unsigned long flags;
	DECLARE_MAC_BUF(mac2);

	if (net->authenticating || net->authenticated)
		return 0;
	net->authenticating = 1;

	/* Add the network if it's not already added */
	ieee80211softmac_add_network(mac, net);

	dprintk(KERN_NOTICE PFX "Queueing Authentication Request to %s\n", print_mac(mac2, net->bssid));
	/* Queue the auth request */
	auth = (struct ieee80211softmac_auth_queue_item *)
		kmalloc(sizeof(struct ieee80211softmac_auth_queue_item), GFP_KERNEL);
	if(auth == NULL)
		return -ENOMEM;

	auth->net = net;
	auth->mac = mac;
	auth->retry = IEEE80211SOFTMAC_AUTH_RETRY_LIMIT;
	auth->state = IEEE80211SOFTMAC_AUTH_OPEN_REQUEST;
	INIT_DELAYED_WORK(&auth->work, ieee80211softmac_auth_queue);

	/* Lock (for list) */
	spin_lock_irqsave(&mac->lock, flags);

	/* add to list */
	list_add_tail(&auth->list, &mac->auth_queue);
	schedule_delayed_work(&auth->work, 0);
	spin_unlock_irqrestore(&mac->lock, flags);

	return 0;
}


/* Sends an auth request to the desired AP and handles timeouts */
static void
ieee80211softmac_auth_queue(struct work_struct *work)
{
	struct ieee80211softmac_device *mac;
	struct ieee80211softmac_auth_queue_item *auth;
	struct ieee80211softmac_network *net;
	unsigned long flags;
	DECLARE_MAC_BUF(mac2);

	auth = container_of(work, struct ieee80211softmac_auth_queue_item,
			    work.work);
	net = auth->net;
	mac = auth->mac;

	if(auth->retry > 0) {
		/* Switch to correct channel for this network */
		mac->set_channel(mac->dev, net->channel);

		/* Lock and set flags */
		spin_lock_irqsave(&mac->lock, flags);
		if (unlikely(!mac->running)) {
			/* Prevent reschedule on workqueue flush */
			spin_unlock_irqrestore(&mac->lock, flags);
			return;
		}
		net->authenticated = 0;
		/* add a timeout call so we eventually give up waiting for an auth reply */
		schedule_delayed_work(&auth->work, IEEE80211SOFTMAC_AUTH_TIMEOUT);
		auth->retry--;
		spin_unlock_irqrestore(&mac->lock, flags);
		if (ieee80211softmac_send_mgt_frame(mac, auth->net, IEEE80211_STYPE_AUTH, auth->state))
			dprintk(KERN_NOTICE PFX "Sending Authentication Request to %s failed (this shouldn't happen, wait for the timeout).\n",
				print_mac(mac2, net->bssid));
		else
			dprintk(KERN_NOTICE PFX "Sent Authentication Request to %s.\n", print_mac(mac2, net->bssid));
		return;
	}

	printkl(KERN_WARNING PFX "Authentication timed out with %s\n", print_mac(mac2, net->bssid));
	/* Remove this item from the queue */
	spin_lock_irqsave(&mac->lock, flags);
	net->authenticating = 0;
	ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT, net);
	cancel_delayed_work(&auth->work); /* just to make sure... */
	list_del(&auth->list);
	spin_unlock_irqrestore(&mac->lock, flags);
	/* Free it */
	kfree(auth);
}

/* Sends a response to an auth challenge (for shared key auth). */
static void
ieee80211softmac_auth_challenge_response(struct work_struct *work)
{
	struct ieee80211softmac_auth_queue_item *aq =
		container_of(work, struct ieee80211softmac_auth_queue_item,
			     work.work);

	/* Send our response */
	ieee80211softmac_send_mgt_frame(aq->mac, aq->net, IEEE80211_STYPE_AUTH, aq->state);
}

/* Handle the auth response from the AP
 * This should be registered with ieee80211 as handle_auth
 */
int
ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth)
{

	struct list_head *list_ptr;
	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	struct ieee80211softmac_auth_queue_item *aq = NULL;
	struct ieee80211softmac_network *net = NULL;
	unsigned long flags;
	u8 * data;
	DECLARE_MAC_BUF(mac2);

	if (unlikely(!mac->running))
		return -ENODEV;

	/* Find correct auth queue item */
	spin_lock_irqsave(&mac->lock, flags);
	list_for_each(list_ptr, &mac->auth_queue) {
		aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list);
		net = aq->net;
		if (!memcmp(net->bssid, auth->header.addr2, ETH_ALEN))
			break;
		else
			aq = NULL;
	}
	spin_unlock_irqrestore(&mac->lock, flags);

	/* Make sure that we've got an auth queue item for this request */
	if(aq == NULL)
	{
		dprintkl(KERN_DEBUG PFX "Authentication response received from %s but no queue item exists.\n", print_mac(mac2, auth->header.addr2));
		/* Error #? */
		return -1;
	}

	/* Check for out of order authentication */
	if(!net->authenticating)
	{
		dprintkl(KERN_DEBUG PFX "Authentication response received from %s but did not request authentication.\n",print_mac(mac2, auth->header.addr2));
		return -1;
	}

	/* Parse the auth packet */
	switch(auth->algorithm) {
	case WLAN_AUTH_OPEN:
		/* Check the status code of the response */

		switch(auth->status) {
		case WLAN_STATUS_SUCCESS:
			/* Update the status to Authenticated */
			spin_lock_irqsave(&mac->lock, flags);
			net->authenticating = 0;
			net->authenticated = 1;
			spin_unlock_irqrestore(&mac->lock, flags);

			/* Send event */
			printkl(KERN_NOTICE PFX "Open Authentication completed with %s\n", print_mac(mac2, net->bssid));
			ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net);
			break;
		default:
			/* Lock and reset flags */
			spin_lock_irqsave(&mac->lock, flags);
			net->authenticated = 0;
			net->authenticating = 0;
			spin_unlock_irqrestore(&mac->lock, flags);

			printkl(KERN_NOTICE PFX "Open Authentication with %s failed, error code: %i\n",
				print_mac(mac2, net->bssid), le16_to_cpup(&auth->status));
			/* Count the error? */
			break;
		}
		goto free_aq;
		break;
	case WLAN_AUTH_SHARED_KEY:
		/* Figure out where we are in the process */
		switch(auth->transaction) {
		case IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE:
			/* Check to make sure we have a challenge IE */
			data = (u8 *)auth->info_element;
			if (*data++ != MFIE_TYPE_CHALLENGE) {
				printkl(KERN_NOTICE PFX "Shared Key Authentication failed due to a missing challenge.\n");
				break;
			}
			/* Save the challenge */
			spin_lock_irqsave(&mac->lock, flags);
			net->challenge_len = *data++;
			if (net->challenge_len > WLAN_AUTH_CHALLENGE_LEN)
				net->challenge_len = WLAN_AUTH_CHALLENGE_LEN;
			kfree(net->challenge);
			net->challenge = kmemdup(data, net->challenge_len,
						 GFP_ATOMIC);
			if (net->challenge == NULL) {
				printkl(KERN_NOTICE PFX "Shared Key "
					"Authentication failed due to "
					"memory shortage.\n");
				spin_unlock_irqrestore(&mac->lock, flags);
				break;
			}
			aq->state = IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE;

			/* We reuse the work struct from the auth request here.
			 * It is safe to do so as each one is per-request, and
			 * at this point (dealing with authentication response)
			 * we have obviously already sent the initial auth
			 * request. */
			cancel_delayed_work(&aq->work);
			INIT_DELAYED_WORK(&aq->work, &ieee80211softmac_auth_challenge_response);
			schedule_delayed_work(&aq->work, 0);
			spin_unlock_irqrestore(&mac->lock, flags);
			return 0;
		case IEEE80211SOFTMAC_AUTH_SHARED_PASS:
			kfree(net->challenge);
			net->challenge = NULL;
			net->challenge_len = 0;
			/* Check the status code of the response */
			switch(auth->status) {
			case WLAN_STATUS_SUCCESS:
				/* Update the status to Authenticated */
				spin_lock_irqsave(&mac->lock, flags);
				net->authenticating = 0;
				net->authenticated = 1;
				spin_unlock_irqrestore(&mac->lock, flags);
				printkl(KERN_NOTICE PFX "Shared Key Authentication completed with %s\n",
					print_mac(mac2, net->bssid));
				ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net);
				break;
			default:
				printkl(KERN_NOTICE PFX "Shared Key Authentication with %s failed, error code: %i\n",
					print_mac(mac2, net->bssid), le16_to_cpup(&auth->status));
				/* Lock and reset flags */
				spin_lock_irqsave(&mac->lock, flags);
				net->authenticating = 0;
				net->authenticated = 0;
				spin_unlock_irqrestore(&mac->lock, flags);
				/* Count the error? */
				break;
			}
			goto free_aq;
			break;
		default:
			printkl(KERN_WARNING PFX "Unhandled Authentication Step: %i\n", auth->transaction);
			break;
		}
		goto free_aq;
		break;
	default:
		/* ERROR */
		goto free_aq;
		break;
	}
	return 0;
free_aq:
	/* Cancel the timeout */
	spin_lock_irqsave(&mac->lock, flags);
	cancel_delayed_work(&aq->work);
	/* Remove this item from the queue */
	list_del(&aq->list);
	spin_unlock_irqrestore(&mac->lock, flags);

	/* Free it */
	kfree(aq);
	return 0;
}

/*
 * Handle deauthorization
 */
static void
ieee80211softmac_deauth_from_net(struct ieee80211softmac_device *mac,
	struct ieee80211softmac_network *net)
{
	struct ieee80211softmac_auth_queue_item *aq = NULL;
	struct list_head *list_ptr;
	unsigned long flags;

	/* deauthentication implies disassociation */
	ieee80211softmac_disassoc(mac);

	/* Lock and reset status flags */
	spin_lock_irqsave(&mac->lock, flags);
	net->authenticating = 0;
	net->authenticated = 0;

	/* Find correct auth queue item, if it exists */
	list_for_each(list_ptr, &mac->auth_queue) {
		aq = list_entry(list_ptr, struct ieee80211softmac_auth_queue_item, list);
		if (!memcmp(net->bssid, aq->net->bssid, ETH_ALEN))
			break;
		else
			aq = NULL;
	}

	/* Cancel pending work */
	if(aq != NULL)
		/* Not entirely safe?  What about running work? */
		cancel_delayed_work(&aq->work);

	/* Free our network ref */
	ieee80211softmac_del_network_locked(mac, net);
	if(net->challenge != NULL)
		kfree(net->challenge);
	kfree(net);

	/* can't transmit data right now... */
	netif_carrier_off(mac->dev);
	spin_unlock_irqrestore(&mac->lock, flags);

	ieee80211softmac_try_reassoc(mac);
}

/*
 * Sends a deauth request to the desired AP
 */
int
ieee80211softmac_deauth_req(struct ieee80211softmac_device *mac,
	struct ieee80211softmac_network *net, int reason)
{
	int ret;

	/* Make sure the network is authenticated */
	if (!net->authenticated)
	{
		dprintkl(KERN_DEBUG PFX "Can't send deauthentication packet, network is not authenticated.\n");
		/* Error okay? */
		return -EPERM;
	}

	/* Send the de-auth packet */
	if((ret = ieee80211softmac_send_mgt_frame(mac, net, IEEE80211_STYPE_DEAUTH, reason)))
		return ret;

	ieee80211softmac_deauth_from_net(mac, net);
	return 0;
}

/*
 * This should be registered with ieee80211 as handle_deauth
 */
int
ieee80211softmac_deauth_resp(struct net_device *dev, struct ieee80211_deauth *deauth)
{

	struct ieee80211softmac_network *net = NULL;
	struct ieee80211softmac_device *mac = ieee80211_priv(dev);
	DECLARE_MAC_BUF(mac2);

	if (unlikely(!mac->running))
		return -ENODEV;

	if (!deauth) {
		dprintk("deauth without deauth packet. eek!\n");
		return 0;
	}

	net = ieee80211softmac_get_network_by_bssid(mac, deauth->header.addr2);

	if (net == NULL) {
		dprintkl(KERN_DEBUG PFX "Received deauthentication packet from %s, but that network is unknown.\n",
			print_mac(mac2, deauth->header.addr2));
		return 0;
	}

	/* Make sure the network is authenticated */
	if(!net->authenticated)
	{
		dprintkl(KERN_DEBUG PFX "Can't perform deauthentication, network is not authenticated.\n");
		/* Error okay? */
		return -EPERM;
	}

	ieee80211softmac_deauth_from_net(mac, net);

	/* let's try to re-associate */
	schedule_delayed_work(&mac->associnfo.work, 0);
	return 0;
}
OpenPOWER on IntegriCloud