1 /*
2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /*
7 * Copyright (c) 2001 Atsushi Onoe
8 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * Alternatively, this software may be distributed under the terms of the
23 * GNU General Public License ("GPL") version 2 as published by the Free
24 * Software Foundation.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * IEEE 802.11i CCMP crypto support.
40 */
41 #include <sys/byteorder.h>
42 #include <sys/crypto/common.h>
43 #include <sys/crypto/api.h>
44 #include <sys/crc32.h>
45 #include <sys/random.h>
46 #include <sys/strsun.h>
47 #include "net80211_impl.h"
48
49 struct ccmp_ctx {
50 struct ieee80211com *cc_ic; /* for diagnostics */
51 };
52
53 #define AES_BLOCK_LEN 16
54 #define AES_NONCE_LEN 13
55
56 static void *ccmp_attach(struct ieee80211com *, struct ieee80211_key *);
57 static void ccmp_detach(struct ieee80211_key *);
58 static int ccmp_setkey(struct ieee80211_key *);
59 static int ccmp_encap(struct ieee80211_key *k, mblk_t *, uint8_t);
60 static int ccmp_decap(struct ieee80211_key *, mblk_t *, int);
61 static int ccmp_enmic(struct ieee80211_key *, mblk_t *, int);
62 static int ccmp_demic(struct ieee80211_key *, mblk_t *, int);
63
64 static int ccmp_encrypt(struct ieee80211_key *, mblk_t *, int);
65 static int ccmp_decrypt(struct ieee80211_key *, uint64_t pn, mblk_t *, int);
66
67 const struct ieee80211_cipher ccmp = {
68 "AES-CCM",
69 IEEE80211_CIPHER_AES_CCM,
70 IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN +
71 IEEE80211_WEP_EXTIVLEN,
72 IEEE80211_WEP_MICLEN,
73 0,
74 ccmp_attach,
75 ccmp_detach,
76 ccmp_setkey,
77 ccmp_encap,
78 ccmp_decap,
79 ccmp_enmic,
80 ccmp_demic,
81 };
82
83 /* ARGSUSED */
84 static void *
ccmp_attach(struct ieee80211com * ic,struct ieee80211_key * k)85 ccmp_attach(struct ieee80211com *ic, struct ieee80211_key *k)
86 {
87 struct ccmp_ctx *ctx;
88
89 ctx = kmem_zalloc(sizeof (struct ccmp_ctx), KM_SLEEP);
90 if (ctx == NULL)
91 return (NULL);
92
93 ctx->cc_ic = ic;
94 return (ctx);
95 }
96
97 static void
ccmp_detach(struct ieee80211_key * k)98 ccmp_detach(struct ieee80211_key *k)
99 {
100 struct ccmp_ctx *ctx = k->wk_private;
101
102 if (ctx != NULL)
103 kmem_free(ctx, sizeof (struct ccmp_ctx));
104 }
105
106 static int
ccmp_setkey(struct ieee80211_key * k)107 ccmp_setkey(struct ieee80211_key *k)
108 {
109 if (k->wk_keylen != (128/NBBY))
110 return (0);
111
112 return (1);
113 }
114
115 /*
116 * Add privacy headers appropriate for the specified key.
117 */
118 static int
ccmp_encap(struct ieee80211_key * k,mblk_t * mp,uint8_t keyid)119 ccmp_encap(struct ieee80211_key *k, mblk_t *mp, uint8_t keyid)
120 {
121 struct ccmp_ctx *ctx = k->wk_private;
122 uint8_t *ivp;
123 int hdrlen;
124
125 hdrlen = ieee80211_hdrspace(ctx->cc_ic, mp->b_rptr);
126 /*
127 * Copy down 802.11 header and add the IV, KeyID, and ExtIV.
128 */
129 ivp = mp->b_rptr;
130 ivp += hdrlen;
131
132 k->wk_keytsc++; /* wrap at 48 bits */
133 ivp[0] = k->wk_keytsc >> 0; /* PN0 */
134 ivp[1] = k->wk_keytsc >> 8; /* PN1 */
135 ivp[2] = 0; /* Reserved */
136 ivp[3] = keyid | IEEE80211_WEP_EXTIV; /* KeyID | ExtID */
137 ivp[4] = k->wk_keytsc >> 16; /* PN2 */
138 ivp[5] = k->wk_keytsc >> 24; /* PN3 */
139 ivp[6] = k->wk_keytsc >> 32; /* PN4 */
140 ivp[7] = k->wk_keytsc >> 40; /* PN5 */
141
142 /*
143 * Finally, do software encrypt if neeed.
144 */
145 if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) &&
146 !ccmp_encrypt(k, mp, hdrlen))
147 return (0);
148
149 return (1);
150 }
151
152 /*
153 * Validate and strip privacy headers (and trailer) for a
154 * received frame. The specified key should be correct but
155 * is also verified.
156 */
157 static int
ccmp_decap(struct ieee80211_key * k,mblk_t * mp,int hdrlen)158 ccmp_decap(struct ieee80211_key *k, mblk_t *mp, int hdrlen)
159 {
160 uint8_t *ivp;
161 uint64_t pn;
162
163 /*
164 * Header should have extended IV and sequence number;
165 * verify the former and validate the latter.
166 */
167 ivp = mp->b_rptr + hdrlen;
168 if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) {
169 /*
170 * No extended IV; discard frame.
171 */
172 return (0);
173 }
174
175 pn = ieee80211_read_6(ivp[0], ivp[1], ivp[4], ivp[5], ivp[6], ivp[7]);
176 if (pn <= k->wk_keyrsc) {
177 /*
178 * Replay violation.
179 */
180 return (0);
181 }
182
183 /*
184 * Check if the device handled the decrypt in hardware.
185 * If so we just strip the header; otherwise we need to
186 * handle the decrypt in software. Note that for the
187 * latter we leave the header in place for use in the
188 * decryption work.
189 */
190 if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) &&
191 !ccmp_decrypt(k, pn, mp, hdrlen))
192 return (0);
193
194 /*
195 * Copy up 802.11 header and strip crypto bits.
196 */
197 (void) memmove(mp->b_rptr + ccmp.ic_header, mp->b_rptr, hdrlen);
198 mp->b_rptr += ccmp.ic_header;
199 mp->b_wptr -= ccmp.ic_trailer;
200
201 /*
202 * Ok to update rsc now.
203 */
204 k->wk_keyrsc = pn;
205
206 return (1);
207 }
208
209 /*
210 * Add MIC to the frame as needed.
211 */
212 /* ARGSUSED */
213 static int
ccmp_enmic(struct ieee80211_key * k,mblk_t * mp,int force)214 ccmp_enmic(struct ieee80211_key *k, mblk_t *mp, int force)
215 {
216 return (1);
217 }
218
219 /*
220 * Verify and strip MIC from the frame.
221 */
222 /* ARGSUSED */
223 static int
ccmp_demic(struct ieee80211_key * k,mblk_t * mp,int force)224 ccmp_demic(struct ieee80211_key *k, mblk_t *mp, int force)
225 {
226 return (1);
227 }
228
229 static int
aes_ccm_encrypt(CK_AES_CCM_PARAMS * cmparam,const uint8_t * key,int keylen,const uint8_t * plaintext,int plain_len,uint8_t * ciphertext,int cipher_len)230 aes_ccm_encrypt(CK_AES_CCM_PARAMS *cmparam, const uint8_t *key, int keylen,
231 const uint8_t *plaintext, int plain_len,
232 uint8_t *ciphertext, int cipher_len)
233 {
234 crypto_mechanism_t mech;
235 crypto_key_t crkey;
236 crypto_data_t d1, d2;
237
238 int rv;
239
240 ieee80211_dbg(IEEE80211_MSG_CRYPTO,
241 "aes_ccm_encrypt(len=%d, keylen=%d)", plain_len, keylen);
242
243 bzero(&crkey, sizeof (crkey));
244
245 crkey.ck_format = CRYPTO_KEY_RAW;
246 crkey.ck_data = (char *)key;
247 /* keys are measured in bits, not bytes, so multiply by 8 */
248 crkey.ck_length = keylen * 8;
249
250 mech.cm_type = crypto_mech2id(SUN_CKM_AES_CCM);
251 mech.cm_param = (caddr_t)cmparam;
252 mech.cm_param_len = sizeof (CK_AES_CCM_PARAMS);
253
254 #if defined(_LP64)
255 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%lx", mech.cm_type);
256 #else
257 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%llx", mech.cm_type);
258 #endif
259
260 bzero(&d1, sizeof (d1));
261 bzero(&d2, sizeof (d2));
262
263 d1.cd_format = CRYPTO_DATA_RAW;
264 d1.cd_offset = 0;
265 d1.cd_length = plain_len;
266 d1.cd_raw.iov_base = (char *)plaintext;
267 d1.cd_raw.iov_len = plain_len;
268
269 d2.cd_format = CRYPTO_DATA_RAW;
270 d2.cd_offset = 0;
271 d2.cd_length = cipher_len;
272 d2.cd_raw.iov_base = (char *)ciphertext;
273 d2.cd_raw.iov_len = cipher_len;
274
275
276 rv = crypto_encrypt(&mech, &d1, &crkey, NULL, &d2, NULL);
277 if (rv != CRYPTO_SUCCESS)
278 ieee80211_err("aes_ccm_encrypt failed (%x)", rv);
279 return (rv);
280 }
281
282 static int
aes_ccm_decrypt(CK_AES_CCM_PARAMS * cmparam,const uint8_t * key,int keylen,const uint8_t * ciphertext,int cipher_len,uint8_t * plaintext,int plain_len)283 aes_ccm_decrypt(CK_AES_CCM_PARAMS *cmparam, const uint8_t *key, int keylen,
284 const uint8_t *ciphertext, int cipher_len,
285 uint8_t *plaintext, int plain_len)
286 {
287 crypto_mechanism_t mech;
288 crypto_key_t crkey;
289 crypto_data_t d1, d2;
290
291 int rv;
292
293 ieee80211_dbg(IEEE80211_MSG_CRYPTO,
294 "aes_ccm_decrypt(len=%d, keylen=%d)", cipher_len, keylen);
295
296 bzero(&crkey, sizeof (crkey));
297
298 crkey.ck_format = CRYPTO_KEY_RAW;
299 crkey.ck_data = (char *)key;
300 /* keys are measured in bits, not bytes, so multiply by 8 */
301 crkey.ck_length = keylen * 8;
302
303 mech.cm_type = crypto_mech2id(SUN_CKM_AES_CCM);
304 mech.cm_param = (caddr_t)cmparam;
305 mech.cm_param_len = sizeof (CK_AES_CCM_PARAMS);
306
307 #if defined(_LP64)
308 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%lx", mech.cm_type);
309 #else
310 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%llx", mech.cm_type);
311 #endif
312
313 bzero(&d1, sizeof (d1));
314 bzero(&d2, sizeof (d2));
315
316 d1.cd_format = CRYPTO_DATA_RAW;
317 d1.cd_offset = 0;
318 d1.cd_length = cipher_len;
319 d1.cd_raw.iov_base = (char *)ciphertext;
320 d1.cd_raw.iov_len = cipher_len;
321
322 d2.cd_format = CRYPTO_DATA_RAW;
323 d2.cd_offset = 0;
324 d2.cd_length = plain_len;
325 d2.cd_raw.iov_base = (char *)plaintext;
326 d2.cd_raw.iov_len = plain_len;
327
328
329 rv = crypto_decrypt(&mech, &d1, &crkey, NULL, &d2, NULL);
330 if (rv != CRYPTO_SUCCESS)
331 ieee80211_err("aes_ccm_decrypt failed (%x)", rv);
332 return (rv);
333 }
334
335 /*
336 * For the avoidance of doubt, except that if any license choice other
337 * than GPL or LGPL is available it will apply instead, Sun elects to
338 * use only the General Public License version 2 (GPLv2) at this time
339 * for any software where a choice of GPL license versions is made
340 * available with the language indicating that GPLv2 or any later
341 * version may be used, or where a choice of which version of the GPL
342 * is applied is otherwise unspecified.
343 */
344
345 /*
346 * Host AP crypt: host-based CCMP encryption implementation for Host AP driver
347 *
348 * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
349 *
350 * This program is free software; you can redistribute it and/or modify
351 * it under the terms of the GNU General Public License version 2 as
352 * published by the Free Software Foundation. See README and COPYING for
353 * more details.
354 *
355 * Alternatively, this software may be distributed under the terms of BSD
356 * license.
357 */
358
359 static void
ccmp_init(struct ieee80211_frame * wh,uint64_t pn,size_t dlen,uint8_t b0[AES_BLOCK_LEN],uint8_t aad[2* AES_BLOCK_LEN])360 ccmp_init(struct ieee80211_frame *wh, uint64_t pn, size_t dlen,
361 uint8_t b0[AES_BLOCK_LEN], uint8_t aad[2 * AES_BLOCK_LEN])
362 {
363 /*
364 * CCM Initial Block:
365 * Flag (Include authentication header, M=3 (8-octet MIC),
366 * L=1 (2-octet Dlen))
367 * Nonce: 0x00 | A2 | PN
368 * Dlen
369 */
370 b0[0] = 0x59;
371 /* b0[1] set below */
372 IEEE80211_ADDR_COPY(b0 + 2, wh->i_addr2);
373 b0[8] = pn >> 40;
374 b0[9] = pn >> 32;
375 b0[10] = pn >> 24;
376 b0[11] = pn >> 16;
377 b0[12] = pn >> 8;
378 b0[13] = (uint8_t)(pn >> 0);
379 b0[14] = (dlen >> 8) & 0xff;
380 b0[15] = dlen & 0xff;
381
382 /*
383 * AAD:
384 * FC with bits 4..6 and 11..13 masked to zero; 14 is always one
385 * A1 | A2 | A3
386 * SC with bits 4..15 (seq#) masked to zero
387 * A4 (if present)
388 * QC (if present)
389 */
390 aad[0] = 0; /* AAD length >> 8 */
391 /* aad[1] set below */
392 aad[2] = wh->i_fc[0] & 0x8f; /* magic #s */
393 aad[3] = wh->i_fc[1] & 0xc7; /* magic #s */
394 /* we know 3 addresses are contiguous */
395 (void) memcpy(aad + 4, wh->i_addr1, 3 * IEEE80211_ADDR_LEN);
396 aad[22] = wh->i_seq[0] & IEEE80211_SEQ_FRAG_MASK;
397 aad[23] = 0; /* all bits masked */
398 /*
399 * Construct variable-length portion of AAD based
400 * on whether this is a 4-address frame/QOS frame.
401 * We always zero-pad to 32 bytes before running it
402 * through the cipher.
403 *
404 * We also fill in the priority bits of the CCM
405 * initial block as we know whether or not we have
406 * a QOS frame.
407 */
408 if (IEEE80211_QOS_HAS_SEQ(wh)) {
409 struct ieee80211_qosframe *qwh =
410 (struct ieee80211_qosframe *)wh;
411 aad[24] = qwh->i_qos[0] & 0x0f; /* just priority bits */
412 aad[25] = 0;
413 b0[1] = aad[24];
414 aad[1] = 22 + 2;
415 } else {
416 *(uint16_t *)&aad[24] = 0;
417 b0[1] = 0;
418 aad[1] = 22;
419 }
420 *(uint16_t *)&aad[26] = 0;
421 *(uint32_t *)&aad[28] = 0;
422 }
423
424 static int
ccmp_encrypt(struct ieee80211_key * key,mblk_t * mp,int hdrlen)425 ccmp_encrypt(struct ieee80211_key *key, mblk_t *mp, int hdrlen)
426 {
427 struct ieee80211_frame *wh;
428 int rv, data_len;
429 uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN];
430 uint8_t *pos;
431 CK_AES_CCM_PARAMS cmparam;
432
433 wh = (struct ieee80211_frame *)mp->b_rptr;
434 data_len = MBLKL(mp) - (hdrlen + ccmp.ic_header);
435 pos = mp->b_rptr + hdrlen + ccmp.ic_header;
436
437 ccmp_init(wh, key->wk_keytsc, data_len, b0, aad);
438
439 cmparam.ulMACSize = IEEE80211_WEP_MICLEN;
440 cmparam.ulNonceSize = AES_NONCE_LEN; /* N size */
441 cmparam.ulAuthDataSize = aad[1]; /* A size */
442 cmparam.ulDataSize = data_len; /* data length; */
443 cmparam.nonce = &b0[1]; /* N */
444 cmparam.authData = &aad[2]; /* A */
445
446 rv = aes_ccm_encrypt(&cmparam,
447 key->wk_key, key->wk_keylen,
448 pos, data_len, pos, data_len + IEEE80211_WEP_MICLEN);
449
450 mp->b_wptr += ccmp.ic_trailer;
451
452 return ((rv == CRYPTO_SUCCESS)? 1 : 0);
453 }
454
455 static int
ccmp_decrypt(struct ieee80211_key * key,uint64_t pn,mblk_t * mp,int hdrlen)456 ccmp_decrypt(struct ieee80211_key *key, uint64_t pn, mblk_t *mp, int hdrlen)
457 {
458 struct ieee80211_frame *wh;
459 int rv, data_len;
460 uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN];
461 uint8_t *pos;
462 CK_AES_CCM_PARAMS cmparam;
463
464 wh = (struct ieee80211_frame *)mp->b_rptr;
465 data_len = MBLKL(mp) - (hdrlen + ccmp.ic_header);
466 pos = mp->b_rptr + hdrlen + ccmp.ic_header;
467
468 ccmp_init(wh, pn, data_len, b0, aad);
469
470 cmparam.ulMACSize = IEEE80211_WEP_MICLEN; /* MIC = 8 */
471 cmparam.ulNonceSize = AES_NONCE_LEN; /* N size */
472 cmparam.ulAuthDataSize = aad[1]; /* A size */
473 cmparam.ulDataSize = data_len;
474 cmparam.nonce = &b0[1]; /* N */
475 cmparam.authData = &aad[2]; /* A */
476
477 rv = aes_ccm_decrypt(&cmparam,
478 key->wk_key, key->wk_keylen, pos, data_len, pos, data_len);
479
480 return ((rv == CRYPTO_SUCCESS)? 1 : 0);
481 }
482