Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net80211/ieee80211_crypto_wep.c
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1 /*- 2 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * Alternatively, this software may be distributed under the terms of the 17 * GNU General Public License ("GPL") version 2 as published by the Free 18 * Software Foundation. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifdef __FreeBSD__ 34 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_wep.c,v 1.7 2005/06/10 16:11:24 sam Exp $"); 35 #endif 36 #ifdef __NetBSD__ 37 __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_wep.c,v 1.7 2006/11/16 01:33:40 christos Exp $"); 38 #endif 39 40 /* 41 * IEEE 802.11 WEP crypto support. 42 */ 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/malloc.h> 47 #include <sys/kernel.h> 48 #include <sys/endian.h> 49 50 #include <sys/socket.h> 51 52 #include <net/if.h> 53 #include <net/if_ether.h> 54 #include <net/if_media.h> 55 56 #include <net80211/ieee80211_var.h> 57 58 static void *wep_attach(struct ieee80211com *, struct ieee80211_key *); 59 static void wep_detach(struct ieee80211_key *); 60 static int wep_setkey(struct ieee80211_key *); 61 static int wep_encap(struct ieee80211_key *, struct mbuf *, u_int8_t keyid); 62 static int wep_decap(struct ieee80211_key *, struct mbuf *, int hdrlen); 63 static int wep_enmic(struct ieee80211_key *, struct mbuf *, int); 64 static int wep_demic(struct ieee80211_key *, struct mbuf *, int); 65 66 const struct ieee80211_cipher ieee80211_cipher_wep = { 67 .ic_name = "WEP", 68 .ic_cipher = IEEE80211_CIPHER_WEP, 69 .ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN, 70 .ic_trailer = IEEE80211_WEP_CRCLEN, 71 .ic_miclen = 0, 72 .ic_attach = wep_attach, 73 .ic_detach = wep_detach, 74 .ic_setkey = wep_setkey, 75 .ic_encap = wep_encap, 76 .ic_decap = wep_decap, 77 .ic_enmic = wep_enmic, 78 .ic_demic = wep_demic, 79 }; 80 81 #define wep ieee80211_cipher_wep 82 83 static int wep_encrypt(struct ieee80211_key *, struct mbuf *, int hdrlen); 84 static int wep_decrypt(struct ieee80211_key *, struct mbuf *, int hdrlen); 85 86 struct wep_ctx { 87 struct ieee80211com *wc_ic; /* for diagnostics */ 88 u_int32_t wc_iv; /* initial vector for crypto */ 89 }; 90 91 static void * 92 wep_attach(struct ieee80211com *ic, struct ieee80211_key *k) 93 { 94 struct wep_ctx *ctx; 95 96 MALLOC(ctx, struct wep_ctx *, sizeof(struct wep_ctx), 97 M_DEVBUF, M_NOWAIT | M_ZERO); 98 if (ctx == NULL) { 99 ic->ic_stats.is_crypto_nomem++; 100 return NULL; 101 } 102 103 ctx->wc_ic = ic; 104 get_random_bytes(&ctx->wc_iv, sizeof(ctx->wc_iv)); 105 return ctx; 106 } 107 108 static void 109 wep_detach(struct ieee80211_key *k) 110 { 111 struct wep_ctx *ctx = k->wk_private; 112 113 FREE(ctx, M_DEVBUF); 114 } 115 116 static int 117 wep_setkey(struct ieee80211_key *k) 118 { 119 return k->wk_keylen >= 40/NBBY; 120 } 121 122 /* 123 * Add privacy headers appropriate for the specified key. 124 */ 125 static int 126 wep_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid) 127 { 128 struct wep_ctx *ctx = k->wk_private; 129 struct ieee80211com *ic = ctx->wc_ic; 130 u_int32_t iv; 131 u_int8_t *ivp; 132 int hdrlen; 133 134 hdrlen = ieee80211_hdrspace(ic, mtod(m, void *)); 135 136 /* 137 * Copy down 802.11 header and add the IV + KeyID. 138 */ 139 M_PREPEND(m, wep.ic_header, M_NOWAIT); 140 if (m == NULL) 141 return 0; 142 ivp = mtod(m, u_int8_t *); 143 ovbcopy(ivp + wep.ic_header, ivp, hdrlen); 144 ivp += hdrlen; 145 146 /* 147 * XXX 148 * IV must not duplicate during the lifetime of the key. 149 * But no mechanism to renew keys is defined in IEEE 802.11 150 * for WEP. And the IV may be duplicated at other stations 151 * because the session key itself is shared. So we use a 152 * pseudo random IV for now, though it is not the right way. 153 * 154 * NB: Rather than use a strictly random IV we select a 155 * random one to start and then increment the value for 156 * each frame. This is an explicit tradeoff between 157 * overhead and security. Given the basic insecurity of 158 * WEP this seems worthwhile. 159 */ 160 161 /* 162 * Skip 'bad' IVs from Fluhrer/Mantin/Shamir: 163 * (B, 255, N) with 3 <= B < 16 and 0 <= N <= 255 164 */ 165 iv = ctx->wc_iv; 166 if ((iv & 0xff00) == 0xff00) { 167 int B = (iv & 0xff0000) >> 16; 168 if (3 <= B && B < 16) 169 iv += 0x0100; 170 } 171 ctx->wc_iv = iv + 1; 172 173 /* 174 * NB: Preserve byte order of IV for packet 175 * sniffers; it doesn't matter otherwise. 176 */ 177 #if _BYTE_ORDER == _BIG_ENDIAN 178 ivp[0] = iv >> 0; 179 ivp[1] = iv >> 8; 180 ivp[2] = iv >> 16; 181 #else 182 ivp[2] = iv >> 0; 183 ivp[1] = iv >> 8; 184 ivp[0] = iv >> 16; 185 #endif 186 ivp[3] = keyid; 187 188 /* 189 * Finally, do software encrypt if neeed. 190 */ 191 if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) && 192 !wep_encrypt(k, m, hdrlen)) 193 return 0; 194 195 return 1; 196 } 197 198 /* 199 * Add MIC to the frame as needed. 200 */ 201 static int 202 wep_enmic(struct ieee80211_key *k, struct mbuf *m, 203 int force) 204 { 205 206 return 1; 207 } 208 209 /* 210 * Validate and strip privacy headers (and trailer) for a 211 * received frame. If necessary, decrypt the frame using 212 * the specified key. 213 */ 214 static int 215 wep_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 216 { 217 struct wep_ctx *ctx = k->wk_private; 218 struct ieee80211_frame *wh; 219 220 wh = mtod(m, struct ieee80211_frame *); 221 222 /* 223 * Check if the device handled the decrypt in hardware. 224 * If so we just strip the header; otherwise we need to 225 * handle the decrypt in software. 226 */ 227 if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) && 228 !wep_decrypt(k, m, hdrlen)) { 229 IEEE80211_DPRINTF(ctx->wc_ic, IEEE80211_MSG_CRYPTO, 230 "[%s] WEP ICV mismatch on decrypt\n", 231 ether_sprintf(wh->i_addr2)); 232 ctx->wc_ic->ic_stats.is_rx_wepfail++; 233 return 0; 234 } 235 236 /* 237 * Copy up 802.11 header and strip crypto bits. 238 */ 239 ovbcopy(mtod(m, void *), mtod(m, u_int8_t *) + wep.ic_header, hdrlen); 240 m_adj(m, wep.ic_header); 241 m_adj(m, -wep.ic_trailer); 242 243 return 1; 244 } 245 246 /* 247 * Verify and strip MIC from the frame. 248 */ 249 static int 250 wep_demic(struct ieee80211_key *k, struct mbuf *skb, 251 int force) 252 { 253 return 1; 254 } 255 256 static const uint32_t crc32_table[256] = { 257 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 258 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 259 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 260 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 261 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 262 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 263 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 264 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 265 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 266 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 267 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 268 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 269 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 270 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 271 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 272 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 273 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 274 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 275 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 276 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 277 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 278 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 279 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 280 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 281 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 282 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 283 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 284 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 285 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 286 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 287 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 288 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 289 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 290 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 291 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 292 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 293 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 294 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 295 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 296 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 297 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 298 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 299 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 300 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 301 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 302 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 303 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 304 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 305 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 306 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 307 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 308 0x2d02ef8dL 309 }; 310 311 static int 312 wep_encrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen) 313 { 314 #define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0) 315 struct wep_ctx *ctx = key->wk_private; 316 struct mbuf *m = m0; 317 u_int8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE]; 318 uint8_t icv[IEEE80211_WEP_CRCLEN]; 319 uint32_t i, j, k, crc; 320 size_t buflen, data_len; 321 uint8_t S[256]; 322 uint8_t *pos; 323 u_int off, keylen; 324 325 ctx->wc_ic->ic_stats.is_crypto_wep++; 326 327 /* NB: this assumes the header was pulled up */ 328 memcpy(rc4key, mtod(m, u_int8_t *) + hdrlen, IEEE80211_WEP_IVLEN); 329 memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen); 330 331 /* Setup RC4 state */ 332 for (i = 0; i < 256; i++) 333 S[i] = i; 334 j = 0; 335 keylen = key->wk_keylen + IEEE80211_WEP_IVLEN; 336 for (i = 0; i < 256; i++) { 337 j = (j + S[i] + rc4key[i % keylen]) & 0xff; 338 S_SWAP(i, j); 339 } 340 341 off = hdrlen + wep.ic_header; 342 data_len = m->m_pkthdr.len - off; 343 344 /* Compute CRC32 over unencrypted data and apply RC4 to data */ 345 crc = ~0; 346 i = j = 0; 347 pos = mtod(m, uint8_t *) + off; 348 buflen = m->m_len - off; 349 for (;;) { 350 if (buflen > data_len) 351 buflen = data_len; 352 data_len -= buflen; 353 for (k = 0; k < buflen; k++) { 354 crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); 355 i = (i + 1) & 0xff; 356 j = (j + S[i]) & 0xff; 357 S_SWAP(i, j); 358 *pos++ ^= S[(S[i] + S[j]) & 0xff]; 359 } 360 if (m->m_next == NULL) { 361 if (data_len != 0) { /* out of data */ 362 IEEE80211_DPRINTF(ctx->wc_ic, 363 IEEE80211_MSG_CRYPTO, 364 "[%s] out of data for WEP (data_len %zu)\n", 365 ether_sprintf(mtod(m0, 366 struct ieee80211_frame *)->i_addr2), 367 data_len); 368 return 0; 369 } 370 break; 371 } 372 m = m->m_next; 373 pos = mtod(m, uint8_t *); 374 buflen = m->m_len; 375 } 376 crc = ~crc; 377 378 /* Append little-endian CRC32 and encrypt it to produce ICV */ 379 icv[0] = crc; 380 icv[1] = crc >> 8; 381 icv[2] = crc >> 16; 382 icv[3] = crc >> 24; 383 for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) { 384 i = (i + 1) & 0xff; 385 j = (j + S[i]) & 0xff; 386 S_SWAP(i, j); 387 icv[k] ^= S[(S[i] + S[j]) & 0xff]; 388 } 389 return m_append(m0, IEEE80211_WEP_CRCLEN, icv); 390 #undef S_SWAP 391 } 392 393 static int 394 wep_decrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen) 395 { 396 #define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0) 397 struct wep_ctx *ctx = key->wk_private; 398 struct mbuf *m = m0; 399 u_int8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE]; 400 uint8_t icv[IEEE80211_WEP_CRCLEN]; 401 uint32_t i, j, k, crc; 402 size_t buflen, data_len; 403 uint8_t S[256]; 404 uint8_t *pos; 405 u_int off, keylen; 406 407 ctx->wc_ic->ic_stats.is_crypto_wep++; 408 409 /* NB: this assumes the header was pulled up */ 410 memcpy(rc4key, mtod(m, u_int8_t *) + hdrlen, IEEE80211_WEP_IVLEN); 411 memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen); 412 413 /* Setup RC4 state */ 414 for (i = 0; i < 256; i++) 415 S[i] = i; 416 j = 0; 417 keylen = key->wk_keylen + IEEE80211_WEP_IVLEN; 418 for (i = 0; i < 256; i++) { 419 j = (j + S[i] + rc4key[i % keylen]) & 0xff; 420 S_SWAP(i, j); 421 } 422 423 off = hdrlen + wep.ic_header; 424 data_len = m->m_pkthdr.len - (off + wep.ic_trailer), 425 426 /* Compute CRC32 over unencrypted data and apply RC4 to data */ 427 crc = ~0; 428 i = j = 0; 429 pos = mtod(m, uint8_t *) + off; 430 buflen = m->m_len - off; 431 for (;;) { 432 if (buflen > data_len) 433 buflen = data_len; 434 data_len -= buflen; 435 for (k = 0; k < buflen; k++) { 436 i = (i + 1) & 0xff; 437 j = (j + S[i]) & 0xff; 438 S_SWAP(i, j); 439 *pos ^= S[(S[i] + S[j]) & 0xff]; 440 crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); 441 pos++; 442 } 443 m = m->m_next; 444 if (m == NULL) { 445 if (data_len != 0) { /* out of data */ 446 IEEE80211_DPRINTF(ctx->wc_ic, 447 IEEE80211_MSG_CRYPTO, 448 "[%s] out of data for WEP (data_len %zu)\n", 449 ether_sprintf(mtod(m0, 450 struct ieee80211_frame *)->i_addr2), 451 data_len); 452 return 0; 453 } 454 break; 455 } 456 pos = mtod(m, uint8_t *); 457 buflen = m->m_len; 458 } 459 crc = ~crc; 460 461 /* Encrypt little-endian CRC32 and verify that it matches with 462 * received ICV */ 463 icv[0] = crc; 464 icv[1] = crc >> 8; 465 icv[2] = crc >> 16; 466 icv[3] = crc >> 24; 467 for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) { 468 i = (i + 1) & 0xff; 469 j = (j + S[i]) & 0xff; 470 S_SWAP(i, j); 471 /* XXX assumes ICV is contiguous in mbuf */ 472 if ((icv[k] ^ S[(S[i] + S[j]) & 0xff]) != *pos++) { 473 /* ICV mismatch - drop frame */ 474 return 0; 475 } 476 } 477 return 1; 478 #undef S_SWAP 479 } 480 481 IEEE80211_CRYPTO_SETUP(wep_register) 482 { 483 ieee80211_crypto_register(&wep); 484 }
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