1 /* 2 * Copyright 2008 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) 2002-2005 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 * 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 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 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 119 ccmp_encap(struct ieee80211_key *k, mblk_t *mp, uint8_t keyid) 120 { 121 uint8_t *ivp; 122 int hdrlen; 123 124 hdrlen = ieee80211_hdrspace(mp->b_rptr); 125 /* 126 * Copy down 802.11 header and add the IV, KeyID, and ExtIV. 127 */ 128 ivp = mp->b_rptr; 129 ivp += hdrlen; 130 131 k->wk_keytsc++; /* wrap at 48 bits */ 132 ivp[0] = k->wk_keytsc >> 0; /* PN0 */ 133 ivp[1] = k->wk_keytsc >> 8; /* PN1 */ 134 ivp[2] = 0; /* Reserved */ 135 ivp[3] = keyid | IEEE80211_WEP_EXTIV; /* KeyID | ExtID */ 136 ivp[4] = k->wk_keytsc >> 16; /* PN2 */ 137 ivp[5] = k->wk_keytsc >> 24; /* PN3 */ 138 ivp[6] = k->wk_keytsc >> 32; /* PN4 */ 139 ivp[7] = k->wk_keytsc >> 40; /* PN5 */ 140 141 /* 142 * Finally, do software encrypt if neeed. 143 */ 144 if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) && 145 !ccmp_encrypt(k, mp, hdrlen)) 146 return (0); 147 148 return (1); 149 } 150 151 /* 152 * Validate and strip privacy headers (and trailer) for a 153 * received frame. The specified key should be correct but 154 * is also verified. 155 */ 156 static int 157 ccmp_decap(struct ieee80211_key *k, mblk_t *mp, int hdrlen) 158 { 159 struct ieee80211_frame tmp; 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 bcopy(mp->b_rptr, &tmp, hdrlen); 198 bcopy(&tmp, mp->b_rptr + ccmp.ic_header, hdrlen); 199 mp->b_rptr += ccmp.ic_header; 200 mp->b_wptr -= ccmp.ic_trailer; 201 202 /* 203 * Ok to update rsc now. 204 */ 205 k->wk_keyrsc = pn; 206 207 return (1); 208 } 209 210 /* 211 * Add MIC to the frame as needed. 212 */ 213 /* ARGSUSED */ 214 static int 215 ccmp_enmic(struct ieee80211_key *k, mblk_t *mp, int force) 216 { 217 return (1); 218 } 219 220 /* 221 * Verify and strip MIC from the frame. 222 */ 223 /* ARGSUSED */ 224 static int 225 ccmp_demic(struct ieee80211_key *k, mblk_t *mp, int force) 226 { 227 return (1); 228 } 229 230 static int 231 aes_ccm_encrypt(CK_AES_CCM_PARAMS *cmparam, const uint8_t *key, int keylen, 232 const uint8_t *plaintext, int plain_len, 233 uint8_t *ciphertext, int cipher_len) 234 { 235 crypto_mechanism_t mech; 236 crypto_key_t crkey; 237 crypto_data_t d1, d2; 238 239 int rv; 240 241 ieee80211_dbg(IEEE80211_MSG_CRYPTO, 242 "aes_ccm_encrypt(len=%d, keylen=%d)", plain_len, keylen); 243 244 bzero(&crkey, sizeof (crkey)); 245 246 crkey.ck_format = CRYPTO_KEY_RAW; 247 crkey.ck_data = (char *)key; 248 /* keys are measured in bits, not bytes, so multiply by 8 */ 249 crkey.ck_length = keylen * 8; 250 251 mech.cm_type = crypto_mech2id(SUN_CKM_AES_CCM); 252 mech.cm_param = (caddr_t)cmparam; 253 mech.cm_param_len = sizeof (CK_AES_CCM_PARAMS); 254 255 #if defined(__amd64) || defined(__sparc) 256 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%lx", mech.cm_type); 257 #else 258 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%llx", mech.cm_type); 259 #endif 260 261 bzero(&d1, sizeof (d1)); 262 bzero(&d2, sizeof (d2)); 263 264 d1.cd_format = CRYPTO_DATA_RAW; 265 d1.cd_offset = 0; 266 d1.cd_length = plain_len; 267 d1.cd_raw.iov_base = (char *)plaintext; 268 d1.cd_raw.iov_len = plain_len; 269 270 d2.cd_format = CRYPTO_DATA_RAW; 271 d2.cd_offset = 0; 272 d2.cd_length = cipher_len; 273 d2.cd_raw.iov_base = (char *)ciphertext; 274 d2.cd_raw.iov_len = cipher_len; 275 276 277 rv = crypto_encrypt(&mech, &d1, &crkey, NULL, &d2, NULL); 278 if (rv != CRYPTO_SUCCESS) 279 ieee80211_err("aes_ccm_encrypt failed (%x)", rv); 280 return (rv); 281 } 282 283 static int 284 aes_ccm_decrypt(CK_AES_CCM_PARAMS *cmparam, const uint8_t *key, int keylen, 285 const uint8_t *ciphertext, int cipher_len, 286 uint8_t *plaintext, int plain_len) 287 { 288 crypto_mechanism_t mech; 289 crypto_key_t crkey; 290 crypto_data_t d1, d2; 291 292 int rv; 293 294 ieee80211_dbg(IEEE80211_MSG_CRYPTO, 295 "aes_ccm_decrypt(len=%d, keylen=%d)", cipher_len, keylen); 296 297 bzero(&crkey, sizeof (crkey)); 298 299 crkey.ck_format = CRYPTO_KEY_RAW; 300 crkey.ck_data = (char *)key; 301 /* keys are measured in bits, not bytes, so multiply by 8 */ 302 crkey.ck_length = keylen * 8; 303 304 mech.cm_type = crypto_mech2id(SUN_CKM_AES_CCM); 305 mech.cm_param = (caddr_t)cmparam; 306 mech.cm_param_len = sizeof (CK_AES_CCM_PARAMS); 307 308 #if defined(__amd64) || defined(__sparc) 309 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%lx", mech.cm_type); 310 #else 311 ieee80211_dbg(IEEE80211_MSG_CRYPTO, "cm_type=%llx", mech.cm_type); 312 #endif 313 314 bzero(&d1, sizeof (d1)); 315 bzero(&d2, sizeof (d2)); 316 317 d1.cd_format = CRYPTO_DATA_RAW; 318 d1.cd_offset = 0; 319 d1.cd_length = cipher_len; 320 d1.cd_raw.iov_base = (char *)ciphertext; 321 d1.cd_raw.iov_len = cipher_len; 322 323 d2.cd_format = CRYPTO_DATA_RAW; 324 d2.cd_offset = 0; 325 d2.cd_length = plain_len; 326 d2.cd_raw.iov_base = (char *)plaintext; 327 d2.cd_raw.iov_len = plain_len; 328 329 330 rv = crypto_decrypt(&mech, &d1, &crkey, NULL, &d2, NULL); 331 if (rv != CRYPTO_SUCCESS) 332 ieee80211_err("aes_ccm_decrypt failed (%x)", rv); 333 return (rv); 334 } 335 336 /* 337 * For the avoidance of doubt, except that if any license choice other 338 * than GPL or LGPL is available it will apply instead, Sun elects to 339 * use only the General Public License version 2 (GPLv2) at this time 340 * for any software where a choice of GPL license versions is made 341 * available with the language indicating that GPLv2 or any later 342 * version may be used, or where a choice of which version of the GPL 343 * is applied is otherwise unspecified. 344 */ 345 346 /* 347 * Host AP crypt: host-based CCMP encryption implementation for Host AP driver 348 * 349 * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi> 350 * 351 * This program is free software; you can redistribute it and/or modify 352 * it under the terms of the GNU General Public License version 2 as 353 * published by the Free Software Foundation. See README and COPYING for 354 * more details. 355 * 356 * Alternatively, this software may be distributed under the terms of BSD 357 * license. 358 */ 359 360 static void 361 ccmp_init(struct ieee80211_frame *wh, uint64_t pn, size_t dlen, 362 uint8_t b0[AES_BLOCK_LEN], uint8_t aad[2 * AES_BLOCK_LEN]) 363 { 364 /* 365 * CCM Initial Block: 366 * Flag (Include authentication header, M=3 (8-octet MIC), 367 * L=1 (2-octet Dlen)) 368 * Nonce: 0x00 | A2 | PN 369 * Dlen 370 */ 371 b0[0] = 0x59; 372 /* b0[1] set below */ 373 IEEE80211_ADDR_COPY(b0 + 2, wh->i_addr2); 374 b0[8] = pn >> 40; 375 b0[9] = pn >> 32; 376 b0[10] = pn >> 24; 377 b0[11] = pn >> 16; 378 b0[12] = pn >> 8; 379 b0[13] = (uint8_t)(pn >> 0); 380 b0[14] = (dlen >> 8) & 0xff; 381 b0[15] = dlen & 0xff; 382 383 /* 384 * AAD: 385 * FC with bits 4..6 and 11..13 masked to zero; 14 is always one 386 * A1 | A2 | A3 387 * SC with bits 4..15 (seq#) masked to zero 388 * A4 (if present) 389 * QC (if present) 390 */ 391 aad[0] = 0; /* AAD length >> 8 */ 392 /* aad[1] set below */ 393 aad[2] = wh->i_fc[0] & 0x8f; /* magic #s */ 394 aad[3] = wh->i_fc[1] & 0xc7; /* magic #s */ 395 /* we know 3 addresses are contiguous */ 396 (void) memcpy(aad + 4, wh->i_addr1, 3 * IEEE80211_ADDR_LEN); 397 aad[22] = wh->i_seq[0] & IEEE80211_SEQ_FRAG_MASK; 398 aad[23] = 0; /* all bits masked */ 399 /* 400 * Construct variable-length portion of AAD based 401 * on whether this is a 4-address frame/QOS frame. 402 * We always zero-pad to 32 bytes before running it 403 * through the cipher. 404 * 405 * We also fill in the priority bits of the CCM 406 * initial block as we know whether or not we have 407 * a QOS frame. 408 */ 409 *(uint16_t *)&aad[24] = 0; 410 b0[1] = 0; 411 aad[1] = 22; 412 *(uint16_t *)&aad[26] = 0; 413 *(uint32_t *)&aad[28] = 0; 414 } 415 416 static int 417 ccmp_encrypt(struct ieee80211_key *key, mblk_t *mp, int hdrlen) 418 { 419 struct ieee80211_frame *wh; 420 int rv, data_len; 421 uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN]; 422 uint8_t *pos; 423 CK_AES_CCM_PARAMS cmparam; 424 425 wh = (struct ieee80211_frame *)mp->b_rptr; 426 data_len = MBLKL(mp) - (hdrlen + ccmp.ic_header); 427 pos = mp->b_rptr + hdrlen + ccmp.ic_header; 428 429 ccmp_init(wh, key->wk_keytsc, data_len, b0, aad); 430 431 cmparam.ulMACSize = IEEE80211_WEP_MICLEN; 432 cmparam.ulNonceSize = AES_NONCE_LEN; /* N size */ 433 cmparam.ulAuthDataSize = aad[1]; /* A size */ 434 cmparam.ulDataSize = data_len; /* data length; */ 435 cmparam.nonce = &b0[1]; /* N */ 436 cmparam.authData = &aad[2]; /* A */ 437 438 rv = aes_ccm_encrypt(&cmparam, 439 key->wk_key, key->wk_keylen, 440 pos, data_len, pos, data_len + IEEE80211_WEP_MICLEN); 441 442 mp->b_wptr += ccmp.ic_trailer; 443 444 return ((rv == CRYPTO_SUCCESS)? 1 : 0); 445 } 446 447 static int 448 ccmp_decrypt(struct ieee80211_key *key, uint64_t pn, mblk_t *mp, int hdrlen) 449 { 450 struct ieee80211_frame *wh; 451 int rv, data_len; 452 uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN]; 453 uint8_t *pos; 454 CK_AES_CCM_PARAMS cmparam; 455 456 wh = (struct ieee80211_frame *)mp->b_rptr; 457 data_len = MBLKL(mp) - (hdrlen + ccmp.ic_header); 458 pos = mp->b_rptr + hdrlen + ccmp.ic_header; 459 460 ccmp_init(wh, pn, data_len, b0, aad); 461 462 cmparam.ulMACSize = IEEE80211_WEP_MICLEN; /* MIC = 8 */ 463 cmparam.ulNonceSize = AES_NONCE_LEN; /* N size */ 464 cmparam.ulAuthDataSize = aad[1]; /* A size */ 465 cmparam.ulDataSize = data_len; 466 cmparam.nonce = &b0[1]; /* N */ 467 cmparam.authData = &aad[2]; /* A */ 468 469 rv = aes_ccm_decrypt(&cmparam, 470 key->wk_key, key->wk_keylen, pos, data_len, pos, data_len); 471 472 return ((rv == CRYPTO_SUCCESS)? 1 : 0); 473 } 474