342 lines
11 KiB
C
342 lines
11 KiB
C
/*
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* Copyright 2002-2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/netdevice.h>
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#include <asm/unaligned.h>
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#include <net/mac80211.h>
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#include "driver-ops.h"
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#include "key.h"
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#include "tkip.h"
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#include "wep.h"
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#define PHASE1_LOOP_COUNT 8
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/*
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* 2-byte by 2-byte subset of the full AES S-box table; second part of this
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* table is identical to first part but byte-swapped
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*/
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static const u16 tkip_sbox[256] =
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{
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0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
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0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
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0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
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0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
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0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
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0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
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0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
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0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
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0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
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0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
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0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
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0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
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0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
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0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
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0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
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0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
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0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
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0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
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0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
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0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
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0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
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0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
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0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
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0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
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0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
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0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
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0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
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0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
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0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
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0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
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0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
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0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
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};
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static u16 tkipS(u16 val)
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{
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return tkip_sbox[val & 0xff] ^ swab16(tkip_sbox[val >> 8]);
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}
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static u8 *write_tkip_iv(u8 *pos, u16 iv16)
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{
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*pos++ = iv16 >> 8;
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*pos++ = ((iv16 >> 8) | 0x20) & 0x7f;
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*pos++ = iv16 & 0xFF;
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return pos;
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}
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/*
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* P1K := Phase1(TA, TK, TSC)
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* TA = transmitter address (48 bits)
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* TK = dot11DefaultKeyValue or dot11KeyMappingValue (128 bits)
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* TSC = TKIP sequence counter (48 bits, only 32 msb bits used)
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* P1K: 80 bits
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*/
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static void tkip_mixing_phase1(const u8 *tk, struct tkip_ctx *ctx,
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const u8 *ta, u32 tsc_IV32)
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{
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int i, j;
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u16 *p1k = ctx->p1k;
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p1k[0] = tsc_IV32 & 0xFFFF;
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p1k[1] = tsc_IV32 >> 16;
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p1k[2] = get_unaligned_le16(ta + 0);
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p1k[3] = get_unaligned_le16(ta + 2);
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p1k[4] = get_unaligned_le16(ta + 4);
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for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
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j = 2 * (i & 1);
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p1k[0] += tkipS(p1k[4] ^ get_unaligned_le16(tk + 0 + j));
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p1k[1] += tkipS(p1k[0] ^ get_unaligned_le16(tk + 4 + j));
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p1k[2] += tkipS(p1k[1] ^ get_unaligned_le16(tk + 8 + j));
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p1k[3] += tkipS(p1k[2] ^ get_unaligned_le16(tk + 12 + j));
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p1k[4] += tkipS(p1k[3] ^ get_unaligned_le16(tk + 0 + j)) + i;
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}
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ctx->initialized = 1;
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}
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static void tkip_mixing_phase2(const u8 *tk, struct tkip_ctx *ctx,
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u16 tsc_IV16, u8 *rc4key)
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{
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u16 ppk[6];
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const u16 *p1k = ctx->p1k;
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int i;
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ppk[0] = p1k[0];
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ppk[1] = p1k[1];
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ppk[2] = p1k[2];
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ppk[3] = p1k[3];
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ppk[4] = p1k[4];
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ppk[5] = p1k[4] + tsc_IV16;
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ppk[0] += tkipS(ppk[5] ^ get_unaligned_le16(tk + 0));
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ppk[1] += tkipS(ppk[0] ^ get_unaligned_le16(tk + 2));
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ppk[2] += tkipS(ppk[1] ^ get_unaligned_le16(tk + 4));
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ppk[3] += tkipS(ppk[2] ^ get_unaligned_le16(tk + 6));
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ppk[4] += tkipS(ppk[3] ^ get_unaligned_le16(tk + 8));
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ppk[5] += tkipS(ppk[4] ^ get_unaligned_le16(tk + 10));
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ppk[0] += ror16(ppk[5] ^ get_unaligned_le16(tk + 12), 1);
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ppk[1] += ror16(ppk[0] ^ get_unaligned_le16(tk + 14), 1);
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ppk[2] += ror16(ppk[1], 1);
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ppk[3] += ror16(ppk[2], 1);
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ppk[4] += ror16(ppk[3], 1);
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ppk[5] += ror16(ppk[4], 1);
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rc4key = write_tkip_iv(rc4key, tsc_IV16);
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*rc4key++ = ((ppk[5] ^ get_unaligned_le16(tk)) >> 1) & 0xFF;
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for (i = 0; i < 6; i++)
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put_unaligned_le16(ppk[i], rc4key + 2 * i);
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}
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/* Add TKIP IV and Ext. IV at @pos. @iv0, @iv1, and @iv2 are the first octets
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* of the IV. Returns pointer to the octet following IVs (i.e., beginning of
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* the packet payload). */
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u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key, u16 iv16)
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{
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pos = write_tkip_iv(pos, iv16);
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*pos++ = (key->conf.keyidx << 6) | (1 << 5) /* Ext IV */;
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put_unaligned_le32(key->u.tkip.tx.iv32, pos);
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return pos + 4;
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}
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void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
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struct sk_buff *skb, enum ieee80211_tkip_key_type type,
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u8 *outkey)
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{
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struct ieee80211_key *key = (struct ieee80211_key *)
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container_of(keyconf, struct ieee80211_key, conf);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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u8 *data;
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const u8 *tk;
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struct tkip_ctx *ctx;
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u16 iv16;
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u32 iv32;
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data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
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iv16 = data[2] | (data[0] << 8);
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iv32 = get_unaligned_le32(&data[4]);
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tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
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ctx = &key->u.tkip.tx;
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#ifdef CONFIG_MAC80211_TKIP_DEBUG
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printk(KERN_DEBUG "TKIP encrypt: iv16 = 0x%04x, iv32 = 0x%08x\n",
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iv16, iv32);
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if (iv32 != ctx->iv32) {
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printk(KERN_DEBUG "skb: iv32 = 0x%08x key: iv32 = 0x%08x\n",
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iv32, ctx->iv32);
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printk(KERN_DEBUG "Wrap around of iv16 in the middle of a "
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"fragmented packet\n");
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}
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#endif
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/* Update the p1k only when the iv16 in the packet wraps around, this
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* might occur after the wrap around of iv16 in the key in case of
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* fragmented packets. */
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if (iv16 == 0 || !ctx->initialized)
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tkip_mixing_phase1(tk, ctx, hdr->addr2, iv32);
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if (type == IEEE80211_TKIP_P1_KEY) {
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memcpy(outkey, ctx->p1k, sizeof(u16) * 5);
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return;
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}
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tkip_mixing_phase2(tk, ctx, iv16, outkey);
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}
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EXPORT_SYMBOL(ieee80211_get_tkip_key);
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/* Encrypt packet payload with TKIP using @key. @pos is a pointer to the
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* beginning of the buffer containing payload. This payload must include
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* headroom of eight octets for IV and Ext. IV and taildroom of four octets
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* for ICV. @payload_len is the length of payload (_not_ including extra
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* headroom and tailroom). @ta is the transmitter addresses. */
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void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
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struct ieee80211_key *key,
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u8 *pos, size_t payload_len, u8 *ta)
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{
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u8 rc4key[16];
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struct tkip_ctx *ctx = &key->u.tkip.tx;
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const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
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/* Calculate per-packet key */
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if (ctx->iv16 == 0 || !ctx->initialized)
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tkip_mixing_phase1(tk, ctx, ta, ctx->iv32);
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tkip_mixing_phase2(tk, ctx, ctx->iv16, rc4key);
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pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
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ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
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}
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/* Decrypt packet payload with TKIP using @key. @pos is a pointer to the
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* beginning of the buffer containing IEEE 802.11 header payload, i.e.,
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* including IV, Ext. IV, real data, Michael MIC, ICV. @payload_len is the
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* length of payload, including IV, Ext. IV, MIC, ICV. */
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int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
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struct ieee80211_key *key,
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u8 *payload, size_t payload_len, u8 *ta,
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u8 *ra, int only_iv, int queue,
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u32 *out_iv32, u16 *out_iv16)
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{
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u32 iv32;
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u32 iv16;
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u8 rc4key[16], keyid, *pos = payload;
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int res;
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const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
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if (payload_len < 12)
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return -1;
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iv16 = (pos[0] << 8) | pos[2];
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keyid = pos[3];
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iv32 = get_unaligned_le32(pos + 4);
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pos += 8;
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#ifdef CONFIG_MAC80211_TKIP_DEBUG
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{
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int i;
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printk(KERN_DEBUG "TKIP decrypt: data(len=%zd)", payload_len);
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for (i = 0; i < payload_len; i++)
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printk(" %02x", payload[i]);
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printk("\n");
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printk(KERN_DEBUG "TKIP decrypt: iv16=%04x iv32=%08x\n",
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iv16, iv32);
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}
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#endif
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if (!(keyid & (1 << 5)))
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return TKIP_DECRYPT_NO_EXT_IV;
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if ((keyid >> 6) != key->conf.keyidx)
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return TKIP_DECRYPT_INVALID_KEYIDX;
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if (key->u.tkip.rx[queue].initialized &&
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(iv32 < key->u.tkip.rx[queue].iv32 ||
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(iv32 == key->u.tkip.rx[queue].iv32 &&
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iv16 <= key->u.tkip.rx[queue].iv16))) {
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#ifdef CONFIG_MAC80211_TKIP_DEBUG
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printk(KERN_DEBUG "TKIP replay detected for RX frame from "
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"%pM (RX IV (%04x,%02x) <= prev. IV (%04x,%02x)\n",
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ta,
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iv32, iv16, key->u.tkip.rx[queue].iv32,
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key->u.tkip.rx[queue].iv16);
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#endif
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return TKIP_DECRYPT_REPLAY;
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}
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if (only_iv) {
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res = TKIP_DECRYPT_OK;
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key->u.tkip.rx[queue].initialized = 1;
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goto done;
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}
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if (!key->u.tkip.rx[queue].initialized ||
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key->u.tkip.rx[queue].iv32 != iv32) {
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/* IV16 wrapped around - perform TKIP phase 1 */
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tkip_mixing_phase1(tk, &key->u.tkip.rx[queue], ta, iv32);
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#ifdef CONFIG_MAC80211_TKIP_DEBUG
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{
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int i;
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u8 key_offset = NL80211_TKIP_DATA_OFFSET_ENCR_KEY;
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printk(KERN_DEBUG "TKIP decrypt: Phase1 TA=%pM"
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" TK=", ta);
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for (i = 0; i < 16; i++)
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printk("%02x ",
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key->conf.key[key_offset + i]);
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printk("\n");
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printk(KERN_DEBUG "TKIP decrypt: P1K=");
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for (i = 0; i < 5; i++)
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printk("%04x ", key->u.tkip.rx[queue].p1k[i]);
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printk("\n");
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}
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#endif
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if (key->local->ops->update_tkip_key &&
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key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
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u8 bcast[ETH_ALEN] =
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{0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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u8 *sta_addr = key->sta->sta.addr;
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if (is_multicast_ether_addr(ra))
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sta_addr = bcast;
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drv_update_tkip_key(key->local, &key->conf, sta_addr,
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iv32, key->u.tkip.rx[queue].p1k);
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}
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}
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tkip_mixing_phase2(tk, &key->u.tkip.rx[queue], iv16, rc4key);
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#ifdef CONFIG_MAC80211_TKIP_DEBUG
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{
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int i;
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printk(KERN_DEBUG "TKIP decrypt: Phase2 rc4key=");
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for (i = 0; i < 16; i++)
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printk("%02x ", rc4key[i]);
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printk("\n");
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}
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#endif
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res = ieee80211_wep_decrypt_data(tfm, rc4key, 16, pos, payload_len - 12);
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done:
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if (res == TKIP_DECRYPT_OK) {
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/*
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* Record previously received IV, will be copied into the
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* key information after MIC verification. It is possible
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* that we don't catch replays of fragments but that's ok
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* because the Michael MIC verication will then fail.
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*/
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*out_iv32 = iv32;
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*out_iv16 = iv16;
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}
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return res;
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}
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