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Viewing changes to libeap/src/eap_peer/eap_sake.c

  • Committer: Package Import Robot
  • Author(s): Sam Hartman
  • Date: 2014-09-16 08:38:39 UTC
  • Revision ID: package-import@ubuntu.com-20140916083839-ipqco3thb1wcwvs0
Tags: upstream-0.9.2
Import upstream version 0.9.2

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libeap/src/eap_peer/eap_sake.c
 
1
/*
 
2
 * EAP peer method: EAP-SAKE (RFC 4763)
 
3
 * Copyright (c) 2006-2008, Jouni Malinen <j@w1.fi>
 
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 version 2 as
 
7
 * published by the Free Software Foundation.
 
8
 *
 
9
 * Alternatively, this software may be distributed under the terms of BSD
 
10
 * license.
 
11
 *
 
12
 * See README and COPYING for more details.
 
13
 */
 
14
 
 
15
#include "includes.h"
 
16
 
 
17
#include "common.h"
 
18
#include "eap_peer/eap_i.h"
 
19
#include "eap_common/eap_sake_common.h"
 
20
 
 
21
struct eap_sake_data {
 
22
        enum { IDENTITY, CHALLENGE, CONFIRM, SUCCESS, FAILURE } state;
 
23
        u8 root_secret_a[EAP_SAKE_ROOT_SECRET_LEN];
 
24
        u8 root_secret_b[EAP_SAKE_ROOT_SECRET_LEN];
 
25
        u8 rand_s[EAP_SAKE_RAND_LEN];
 
26
        u8 rand_p[EAP_SAKE_RAND_LEN];
 
27
        struct {
 
28
                u8 auth[EAP_SAKE_TEK_AUTH_LEN];
 
29
                u8 cipher[EAP_SAKE_TEK_CIPHER_LEN];
 
30
        } tek;
 
31
        u8 msk[EAP_MSK_LEN];
 
32
        u8 emsk[EAP_EMSK_LEN];
 
33
        u8 session_id;
 
34
        int session_id_set;
 
35
        u8 *peerid;
 
36
        size_t peerid_len;
 
37
        u8 *serverid;
 
38
        size_t serverid_len;
 
39
};
 
40
 
 
41
 
 
42
static const char * eap_sake_state_txt(int state)
 
43
{
 
44
        switch (state) {
 
45
        case IDENTITY:
 
46
                return "IDENTITY";
 
47
        case CHALLENGE:
 
48
                return "CHALLENGE";
 
49
        case CONFIRM:
 
50
                return "CONFIRM";
 
51
        case SUCCESS:
 
52
                return "SUCCESS";
 
53
        case FAILURE:
 
54
                return "FAILURE";
 
55
        default:
 
56
                return "?";
 
57
        }
 
58
}
 
59
 
 
60
 
 
61
static void eap_sake_state(struct eap_sake_data *data, int state)
 
62
{
 
63
        wpa_printf(MSG_DEBUG, "EAP-SAKE: %s -> %s",
 
64
                   eap_sake_state_txt(data->state),
 
65
                   eap_sake_state_txt(state));
 
66
        data->state = state;
 
67
}
 
68
 
 
69
 
 
70
static void eap_sake_deinit(struct eap_sm *sm, void *priv);
 
71
 
 
72
 
 
73
static void * eap_sake_init(struct eap_sm *sm)
 
74
{
 
75
        struct eap_sake_data *data;
 
76
        const u8 *identity, *password;
 
77
        size_t identity_len, password_len;
 
78
 
 
79
        password = eap_get_config_password(sm, &password_len);
 
80
        if (!password || password_len != 2 * EAP_SAKE_ROOT_SECRET_LEN) {
 
81
                wpa_printf(MSG_INFO, "EAP-SAKE: No key of correct length "
 
82
                           "configured");
 
83
                return NULL;
 
84
        }
 
85
 
 
86
        data = os_zalloc(sizeof(*data));
 
87
        if (data == NULL)
 
88
                return NULL;
 
89
        data->state = IDENTITY;
 
90
 
 
91
        identity = eap_get_config_identity(sm, &identity_len);
 
92
        if (identity) {
 
93
                data->peerid = os_malloc(identity_len);
 
94
                if (data->peerid == NULL) {
 
95
                        eap_sake_deinit(sm, data);
 
96
                        return NULL;
 
97
                }
 
98
                os_memcpy(data->peerid, identity, identity_len);
 
99
                data->peerid_len = identity_len;
 
100
        }
 
101
 
 
102
        os_memcpy(data->root_secret_a, password, EAP_SAKE_ROOT_SECRET_LEN);
 
103
        os_memcpy(data->root_secret_b,
 
104
                  password + EAP_SAKE_ROOT_SECRET_LEN,
 
105
                  EAP_SAKE_ROOT_SECRET_LEN);
 
106
 
 
107
        return data;
 
108
}
 
109
 
 
110
 
 
111
static void eap_sake_deinit(struct eap_sm *sm, void *priv)
 
112
{
 
113
        struct eap_sake_data *data = priv;
 
114
        os_free(data->serverid);
 
115
        os_free(data->peerid);
 
116
        os_free(data);
 
117
}
 
118
 
 
119
 
 
120
static struct wpabuf * eap_sake_build_msg(struct eap_sake_data *data,
 
121
                                          int id, size_t length, u8 subtype)
 
122
{
 
123
        struct eap_sake_hdr *sake;
 
124
        struct wpabuf *msg;
 
125
        size_t plen;
 
126
 
 
127
        plen = length + sizeof(struct eap_sake_hdr);
 
128
 
 
129
        msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_SAKE, plen,
 
130
                            EAP_CODE_RESPONSE, id);
 
131
        if (msg == NULL) {
 
132
                wpa_printf(MSG_ERROR, "EAP-SAKE: Failed to allocate memory "
 
133
                           "request");
 
134
                return NULL;
 
135
        }
 
136
 
 
137
        sake = wpabuf_put(msg, sizeof(*sake));
 
138
        sake->version = EAP_SAKE_VERSION;
 
139
        sake->session_id = data->session_id;
 
140
        sake->subtype = subtype;
 
141
 
 
142
        return msg;
 
143
}
 
144
 
 
145
 
 
146
static struct wpabuf * eap_sake_process_identity(struct eap_sm *sm,
 
147
                                                 struct eap_sake_data *data,
 
148
                                                 struct eap_method_ret *ret,
 
149
                                                 const struct wpabuf *reqData,
 
150
                                                 const u8 *payload,
 
151
                                                 size_t payload_len)
 
152
{
 
153
        struct eap_sake_parse_attr attr;
 
154
        struct wpabuf *resp;
 
155
 
 
156
        if (data->state != IDENTITY) {
 
157
                ret->ignore = TRUE;
 
158
                return NULL;
 
159
        }
 
160
 
 
161
        wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Identity");
 
162
 
 
163
        if (eap_sake_parse_attributes(payload, payload_len, &attr))
 
164
                return NULL;
 
165
 
 
166
        if (!attr.perm_id_req && !attr.any_id_req) {
 
167
                wpa_printf(MSG_INFO, "EAP-SAKE: No AT_PERM_ID_REQ or "
 
168
                           "AT_ANY_ID_REQ in Request/Identity");
 
169
                return NULL;
 
170
        }
 
171
 
 
172
        wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Identity");
 
173
 
 
174
        resp = eap_sake_build_msg(data, eap_get_id(reqData),
 
175
                                  2 + data->peerid_len,
 
176
                                  EAP_SAKE_SUBTYPE_IDENTITY);
 
177
        if (resp == NULL)
 
178
                return NULL;
 
179
 
 
180
        wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_PEERID");
 
181
        eap_sake_add_attr(resp, EAP_SAKE_AT_PEERID,
 
182
                          data->peerid, data->peerid_len);
 
183
 
 
184
        eap_sake_state(data, CHALLENGE);
 
185
 
 
186
        return resp;
 
187
}
 
188
 
 
189
 
 
190
static struct wpabuf * eap_sake_process_challenge(struct eap_sm *sm,
 
191
                                                  struct eap_sake_data *data,
 
192
                                                  struct eap_method_ret *ret,
 
193
                                                  const struct wpabuf *reqData,
 
194
                                                  const u8 *payload,
 
195
                                                  size_t payload_len)
 
196
{
 
197
        struct eap_sake_parse_attr attr;
 
198
        struct wpabuf *resp;
 
199
        u8 *rpos;
 
200
        size_t rlen;
 
201
 
 
202
        if (data->state != IDENTITY && data->state != CHALLENGE) {
 
203
                wpa_printf(MSG_DEBUG, "EAP-SAKE: Request/Challenge received "
 
204
                           "in unexpected state (%d)", data->state);
 
205
                ret->ignore = TRUE;
 
206
                return NULL;
 
207
        }
 
208
        if (data->state == IDENTITY)
 
209
                eap_sake_state(data, CHALLENGE);
 
210
 
 
211
        wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Challenge");
 
212
 
 
213
        if (eap_sake_parse_attributes(payload, payload_len, &attr))
 
214
                return NULL;
 
215
 
 
216
        if (!attr.rand_s) {
 
217
                wpa_printf(MSG_INFO, "EAP-SAKE: Request/Challenge did not "
 
218
                           "include AT_RAND_S");
 
219
                return NULL;
 
220
        }
 
221
 
 
222
        os_memcpy(data->rand_s, attr.rand_s, EAP_SAKE_RAND_LEN);
 
223
        wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_S (server rand)",
 
224
                    data->rand_s, EAP_SAKE_RAND_LEN);
 
225
 
 
226
        if (os_get_random(data->rand_p, EAP_SAKE_RAND_LEN)) {
 
227
                wpa_printf(MSG_ERROR, "EAP-SAKE: Failed to get random data");
 
228
                return NULL;
 
229
        }
 
230
        wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_P (peer rand)",
 
231
                    data->rand_p, EAP_SAKE_RAND_LEN);
 
232
 
 
233
        os_free(data->serverid);
 
234
        data->serverid = NULL;
 
235
        data->serverid_len = 0;
 
236
        if (attr.serverid) {
 
237
                wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-SAKE: SERVERID",
 
238
                                  attr.serverid, attr.serverid_len);
 
239
                data->serverid = os_malloc(attr.serverid_len);
 
240
                if (data->serverid == NULL)
 
241
                        return NULL;
 
242
                os_memcpy(data->serverid, attr.serverid, attr.serverid_len);
 
243
                data->serverid_len = attr.serverid_len;
 
244
        }
 
245
 
 
246
        eap_sake_derive_keys(data->root_secret_a, data->root_secret_b,
 
247
                             data->rand_s, data->rand_p,
 
248
                             (u8 *) &data->tek, data->msk, data->emsk);
 
249
 
 
250
        wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Challenge");
 
251
 
 
252
        rlen = 2 + EAP_SAKE_RAND_LEN + 2 + EAP_SAKE_MIC_LEN;
 
253
        if (data->peerid)
 
254
                rlen += 2 + data->peerid_len;
 
255
        resp = eap_sake_build_msg(data, eap_get_id(reqData), rlen,
 
256
                                  EAP_SAKE_SUBTYPE_CHALLENGE);
 
257
        if (resp == NULL)
 
258
                return NULL;
 
259
 
 
260
        wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_RAND_P");
 
261
        eap_sake_add_attr(resp, EAP_SAKE_AT_RAND_P,
 
262
                          data->rand_p, EAP_SAKE_RAND_LEN);
 
263
 
 
264
        if (data->peerid) {
 
265
                wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_PEERID");
 
266
                eap_sake_add_attr(resp, EAP_SAKE_AT_PEERID,
 
267
                                  data->peerid, data->peerid_len);
 
268
        }
 
269
 
 
270
        wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_MIC_P");
 
271
        wpabuf_put_u8(resp, EAP_SAKE_AT_MIC_P);
 
272
        wpabuf_put_u8(resp, 2 + EAP_SAKE_MIC_LEN);
 
273
        rpos = wpabuf_put(resp, EAP_SAKE_MIC_LEN);
 
274
        if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
 
275
                                 data->serverid, data->serverid_len,
 
276
                                 data->peerid, data->peerid_len, 1,
 
277
                                 wpabuf_head(resp), wpabuf_len(resp), rpos,
 
278
                                 rpos)) {
 
279
                wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
 
280
                wpabuf_free(resp);
 
281
                return NULL;
 
282
        }
 
283
 
 
284
        eap_sake_state(data, CONFIRM);
 
285
 
 
286
        return resp;
 
287
}
 
288
 
 
289
 
 
290
static struct wpabuf * eap_sake_process_confirm(struct eap_sm *sm,
 
291
                                                struct eap_sake_data *data,
 
292
                                                struct eap_method_ret *ret,
 
293
                                                const struct wpabuf *reqData,
 
294
                                                const u8 *payload,
 
295
                                                size_t payload_len)
 
296
{
 
297
        struct eap_sake_parse_attr attr;
 
298
        u8 mic_s[EAP_SAKE_MIC_LEN];
 
299
        struct wpabuf *resp;
 
300
        u8 *rpos;
 
301
 
 
302
        if (data->state != CONFIRM) {
 
303
                ret->ignore = TRUE;
 
304
                return NULL;
 
305
        }
 
306
 
 
307
        wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Confirm");
 
308
 
 
309
        if (eap_sake_parse_attributes(payload, payload_len, &attr))
 
310
                return NULL;
 
311
 
 
312
        if (!attr.mic_s) {
 
313
                wpa_printf(MSG_INFO, "EAP-SAKE: Request/Confirm did not "
 
314
                           "include AT_MIC_S");
 
315
                return NULL;
 
316
        }
 
317
 
 
318
        eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
 
319
                             data->serverid, data->serverid_len,
 
320
                             data->peerid, data->peerid_len, 0,
 
321
                             wpabuf_head(reqData), wpabuf_len(reqData),
 
322
                             attr.mic_s, mic_s);
 
323
        if (os_memcmp(attr.mic_s, mic_s, EAP_SAKE_MIC_LEN) != 0) {
 
324
                wpa_printf(MSG_INFO, "EAP-SAKE: Incorrect AT_MIC_S");
 
325
                eap_sake_state(data, FAILURE);
 
326
                ret->methodState = METHOD_DONE;
 
327
                ret->decision = DECISION_FAIL;
 
328
                ret->allowNotifications = FALSE;
 
329
                wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending "
 
330
                           "Response/Auth-Reject");
 
331
                return eap_sake_build_msg(data, eap_get_id(reqData), 0,
 
332
                                          EAP_SAKE_SUBTYPE_AUTH_REJECT);
 
333
        }
 
334
 
 
335
        wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Confirm");
 
336
 
 
337
        resp = eap_sake_build_msg(data, eap_get_id(reqData),
 
338
                                  2 + EAP_SAKE_MIC_LEN,
 
339
                                  EAP_SAKE_SUBTYPE_CONFIRM);
 
340
        if (resp == NULL)
 
341
                return NULL;
 
342
 
 
343
        wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_MIC_P");
 
344
        wpabuf_put_u8(resp, EAP_SAKE_AT_MIC_P);
 
345
        wpabuf_put_u8(resp, 2 + EAP_SAKE_MIC_LEN);
 
346
        rpos = wpabuf_put(resp, EAP_SAKE_MIC_LEN);
 
347
        if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
 
348
                                 data->serverid, data->serverid_len,
 
349
                                 data->peerid, data->peerid_len, 1,
 
350
                                 wpabuf_head(resp), wpabuf_len(resp), rpos,
 
351
                                 rpos)) {
 
352
                wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
 
353
                wpabuf_free(resp);
 
354
                return NULL;
 
355
        }
 
356
 
 
357
        eap_sake_state(data, SUCCESS);
 
358
        ret->methodState = METHOD_DONE;
 
359
        ret->decision = DECISION_UNCOND_SUCC;
 
360
        ret->allowNotifications = FALSE;
 
361
 
 
362
        return resp;
 
363
}
 
364
 
 
365
 
 
366
static struct wpabuf * eap_sake_process(struct eap_sm *sm, void *priv,
 
367
                                        struct eap_method_ret *ret,
 
368
                                        const struct wpabuf *reqData)
 
369
{
 
370
        struct eap_sake_data *data = priv;
 
371
        const struct eap_sake_hdr *req;
 
372
        struct wpabuf *resp;
 
373
        const u8 *pos, *end;
 
374
        size_t len;
 
375
        u8 subtype, session_id;
 
376
 
 
377
        pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SAKE, reqData, &len);
 
378
        if (pos == NULL || len < sizeof(struct eap_sake_hdr)) {
 
379
                ret->ignore = TRUE;
 
380
                return NULL;
 
381
        }
 
382
 
 
383
        req = (const struct eap_sake_hdr *) pos;
 
384
        end = pos + len;
 
385
        subtype = req->subtype;
 
386
        session_id = req->session_id;
 
387
        pos = (const u8 *) (req + 1);
 
388
 
 
389
        wpa_printf(MSG_DEBUG, "EAP-SAKE: Received frame: subtype %d "
 
390
                   "session_id %d", subtype, session_id);
 
391
        wpa_hexdump(MSG_DEBUG, "EAP-SAKE: Received attributes",
 
392
                    pos, end - pos);
 
393
 
 
394
        if (data->session_id_set && data->session_id != session_id) {
 
395
                wpa_printf(MSG_INFO, "EAP-SAKE: Session ID mismatch (%d,%d)",
 
396
                           session_id, data->session_id);
 
397
                ret->ignore = TRUE;
 
398
                return NULL;
 
399
        }
 
400
        data->session_id = session_id;
 
401
        data->session_id_set = 1;
 
402
 
 
403
        ret->ignore = FALSE;
 
404
        ret->methodState = METHOD_MAY_CONT;
 
405
        ret->decision = DECISION_FAIL;
 
406
        ret->allowNotifications = TRUE;
 
407
 
 
408
        switch (subtype) {
 
409
        case EAP_SAKE_SUBTYPE_IDENTITY:
 
410
                resp = eap_sake_process_identity(sm, data, ret, reqData,
 
411
                                                 pos, end - pos);
 
412
                break;
 
413
        case EAP_SAKE_SUBTYPE_CHALLENGE:
 
414
                resp = eap_sake_process_challenge(sm, data, ret, reqData,
 
415
                                                  pos, end - pos);
 
416
                break;
 
417
        case EAP_SAKE_SUBTYPE_CONFIRM:
 
418
                resp = eap_sake_process_confirm(sm, data, ret, reqData,
 
419
                                                pos, end - pos);
 
420
                break;
 
421
        default:
 
422
                wpa_printf(MSG_DEBUG, "EAP-SAKE: Ignoring message with "
 
423
                           "unknown subtype %d", subtype);
 
424
                ret->ignore = TRUE;
 
425
                return NULL;
 
426
        }
 
427
 
 
428
        if (ret->methodState == METHOD_DONE)
 
429
                ret->allowNotifications = FALSE;
 
430
 
 
431
        return resp;
 
432
}
 
433
 
 
434
 
 
435
static Boolean eap_sake_isKeyAvailable(struct eap_sm *sm, void *priv)
 
436
{
 
437
        struct eap_sake_data *data = priv;
 
438
        return data->state == SUCCESS;
 
439
}
 
440
 
 
441
 
 
442
static u8 * eap_sake_getKey(struct eap_sm *sm, void *priv, size_t *len)
 
443
{
 
444
        struct eap_sake_data *data = priv;
 
445
        u8 *key;
 
446
 
 
447
        if (data->state != SUCCESS)
 
448
                return NULL;
 
449
 
 
450
        key = os_malloc(EAP_MSK_LEN);
 
451
        if (key == NULL)
 
452
                return NULL;
 
453
        os_memcpy(key, data->msk, EAP_MSK_LEN);
 
454
        *len = EAP_MSK_LEN;
 
455
 
 
456
        return key;
 
457
}
 
458
 
 
459
 
 
460
static u8 * eap_sake_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
 
461
{
 
462
        struct eap_sake_data *data = priv;
 
463
        u8 *key;
 
464
 
 
465
        if (data->state != SUCCESS)
 
466
                return NULL;
 
467
 
 
468
        key = os_malloc(EAP_EMSK_LEN);
 
469
        if (key == NULL)
 
470
                return NULL;
 
471
        os_memcpy(key, data->emsk, EAP_EMSK_LEN);
 
472
        *len = EAP_EMSK_LEN;
 
473
 
 
474
        return key;
 
475
}
 
476
 
 
477
 
 
478
int eap_peer_sake_register(void)
 
479
{
 
480
        struct eap_method *eap;
 
481
        int ret;
 
482
 
 
483
        eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
 
484
                                    EAP_VENDOR_IETF, EAP_TYPE_SAKE, "SAKE");
 
485
        if (eap == NULL)
 
486
                return -1;
 
487
 
 
488
        eap->init = eap_sake_init;
 
489
        eap->deinit = eap_sake_deinit;
 
490
        eap->process = eap_sake_process;
 
491
        eap->isKeyAvailable = eap_sake_isKeyAvailable;
 
492
        eap->getKey = eap_sake_getKey;
 
493
        eap->get_emsk = eap_sake_get_emsk;
 
494
 
 
495
        ret = eap_peer_method_register(eap);
 
496
        if (ret)
 
497
                eap_peer_method_free(eap);
 
498
        return ret;
 
499
}