Index: head/sys/net80211/ieee80211_crypto.c =================================================================== --- head/sys/net80211/ieee80211_crypto.c (revision 288522) +++ head/sys/net80211/ieee80211_crypto.c (revision 288523) @@ -1,661 +1,668 @@ /*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * IEEE 802.11 generic crypto support. */ #include "opt_wlan.h" #include #include #include #include #include #include #include #include /* XXX ETHER_HDR_LEN */ #include MALLOC_DEFINE(M_80211_CRYPTO, "80211crypto", "802.11 crypto state"); static int _ieee80211_crypto_delkey(struct ieee80211vap *, struct ieee80211_key *); /* * Table of registered cipher modules. */ static const struct ieee80211_cipher *ciphers[IEEE80211_CIPHER_MAX]; /* * Default "null" key management routines. */ static int null_key_alloc(struct ieee80211vap *vap, struct ieee80211_key *k, ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) { if (!(&vap->iv_nw_keys[0] <= k && k < &vap->iv_nw_keys[IEEE80211_WEP_NKID])) { /* * Not in the global key table, the driver should handle this * by allocating a slot in the h/w key table/cache. In * lieu of that return key slot 0 for any unicast key * request. We disallow the request if this is a group key. * This default policy does the right thing for legacy hardware * with a 4 key table. It also handles devices that pass * packets through untouched when marked with the WEP bit * and key index 0. */ if (k->wk_flags & IEEE80211_KEY_GROUP) return 0; *keyix = 0; /* NB: use key index 0 for ucast key */ } else { *keyix = k - vap->iv_nw_keys; } *rxkeyix = IEEE80211_KEYIX_NONE; /* XXX maybe *keyix? */ return 1; } static int null_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *k) { return 1; } static int null_key_set(struct ieee80211vap *vap, const struct ieee80211_key *k, const uint8_t mac[IEEE80211_ADDR_LEN]) { return 1; } static void null_key_update(struct ieee80211vap *vap) {} /* * Write-arounds for common operations. */ static __inline void cipher_detach(struct ieee80211_key *key) { key->wk_cipher->ic_detach(key); } static __inline void * cipher_attach(struct ieee80211vap *vap, struct ieee80211_key *key) { return key->wk_cipher->ic_attach(vap, key); } /* * Wrappers for driver key management methods. */ static __inline int dev_key_alloc(struct ieee80211vap *vap, struct ieee80211_key *key, ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) { return vap->iv_key_alloc(vap, key, keyix, rxkeyix); } static __inline int dev_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *key) { return vap->iv_key_delete(vap, key); } static __inline int dev_key_set(struct ieee80211vap *vap, const struct ieee80211_key *key) { return vap->iv_key_set(vap, key, key->wk_macaddr); } /* * Setup crypto support for a device/shared instance. */ void ieee80211_crypto_attach(struct ieee80211com *ic) { /* NB: we assume everything is pre-zero'd */ ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none; } /* * Teardown crypto support. */ void ieee80211_crypto_detach(struct ieee80211com *ic) { } /* * Setup crypto support for a vap. */ void ieee80211_crypto_vattach(struct ieee80211vap *vap) { int i; /* NB: we assume everything is pre-zero'd */ vap->iv_max_keyix = IEEE80211_WEP_NKID; vap->iv_def_txkey = IEEE80211_KEYIX_NONE; for (i = 0; i < IEEE80211_WEP_NKID; i++) ieee80211_crypto_resetkey(vap, &vap->iv_nw_keys[i], IEEE80211_KEYIX_NONE); /* * Initialize the driver key support routines to noop entries. * This is useful especially for the cipher test modules. */ vap->iv_key_alloc = null_key_alloc; vap->iv_key_set = null_key_set; vap->iv_key_delete = null_key_delete; vap->iv_key_update_begin = null_key_update; vap->iv_key_update_end = null_key_update; } /* * Teardown crypto support for a vap. */ void ieee80211_crypto_vdetach(struct ieee80211vap *vap) { ieee80211_crypto_delglobalkeys(vap); } /* * Register a crypto cipher module. */ void ieee80211_crypto_register(const struct ieee80211_cipher *cip) { if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { printf("%s: cipher %s has an invalid cipher index %u\n", __func__, cip->ic_name, cip->ic_cipher); return; } if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { printf("%s: cipher %s registered with a different template\n", __func__, cip->ic_name); return; } ciphers[cip->ic_cipher] = cip; } /* * Unregister a crypto cipher module. */ void ieee80211_crypto_unregister(const struct ieee80211_cipher *cip) { if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { printf("%s: cipher %s has an invalid cipher index %u\n", __func__, cip->ic_name, cip->ic_cipher); return; } if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { printf("%s: cipher %s registered with a different template\n", __func__, cip->ic_name); return; } /* NB: don't complain about not being registered */ /* XXX disallow if references */ ciphers[cip->ic_cipher] = NULL; } int ieee80211_crypto_available(u_int cipher) { return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL; } /* XXX well-known names! */ static const char *cipher_modnames[IEEE80211_CIPHER_MAX] = { [IEEE80211_CIPHER_WEP] = "wlan_wep", [IEEE80211_CIPHER_TKIP] = "wlan_tkip", [IEEE80211_CIPHER_AES_OCB] = "wlan_aes_ocb", [IEEE80211_CIPHER_AES_CCM] = "wlan_ccmp", [IEEE80211_CIPHER_TKIPMIC] = "#4", /* NB: reserved */ [IEEE80211_CIPHER_CKIP] = "wlan_ckip", [IEEE80211_CIPHER_NONE] = "wlan_none", }; /* NB: there must be no overlap between user-supplied and device-owned flags */ CTASSERT((IEEE80211_KEY_COMMON & IEEE80211_KEY_DEVICE) == 0); /* * Establish a relationship between the specified key and cipher * and, if necessary, allocate a hardware index from the driver. * Note that when a fixed key index is required it must be specified. * * This must be the first call applied to a key; all the other key * routines assume wk_cipher is setup. * * Locking must be handled by the caller using: * ieee80211_key_update_begin(vap); * ieee80211_key_update_end(vap); */ int ieee80211_crypto_newkey(struct ieee80211vap *vap, int cipher, int flags, struct ieee80211_key *key) { struct ieee80211com *ic = vap->iv_ic; const struct ieee80211_cipher *cip; ieee80211_keyix keyix, rxkeyix; void *keyctx; int oflags; IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: cipher %u flags 0x%x keyix %u\n", __func__, cipher, flags, key->wk_keyix); /* * Validate cipher and set reference to cipher routines. */ if (cipher >= IEEE80211_CIPHER_MAX) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: invalid cipher %u\n", __func__, cipher); vap->iv_stats.is_crypto_badcipher++; return 0; } cip = ciphers[cipher]; if (cip == NULL) { /* * Auto-load cipher module if we have a well-known name * for it. It might be better to use string names rather * than numbers and craft a module name based on the cipher * name; e.g. wlan_cipher_. */ IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: unregistered cipher %u, load module %s\n", __func__, cipher, cipher_modnames[cipher]); ieee80211_load_module(cipher_modnames[cipher]); /* * If cipher module loaded it should immediately * call ieee80211_crypto_register which will fill * in the entry in the ciphers array. */ cip = ciphers[cipher]; if (cip == NULL) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: unable to load cipher %u, module %s\n", __func__, cipher, cipher_modnames[cipher]); vap->iv_stats.is_crypto_nocipher++; return 0; } } oflags = key->wk_flags; flags &= IEEE80211_KEY_COMMON; /* NB: preserve device attributes */ flags |= (oflags & IEEE80211_KEY_DEVICE); /* * If the hardware does not support the cipher then * fallback to a host-based implementation. */ if ((ic->ic_cryptocaps & (1<ic_name); flags |= IEEE80211_KEY_SWCRYPT; } /* * Hardware TKIP with software MIC is an important * combination; we handle it by flagging each key, * the cipher modules honor it. */ if (cipher == IEEE80211_CIPHER_TKIP && (ic->ic_cryptocaps & IEEE80211_CRYPTO_TKIPMIC) == 0) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: no h/w support for TKIP MIC, falling back to s/w\n", __func__); flags |= IEEE80211_KEY_SWMIC; } /* * Bind cipher to key instance. Note we do this * after checking the device capabilities so the * cipher module can optimize space usage based on * whether or not it needs to do the cipher work. */ if (key->wk_cipher != cip || key->wk_flags != flags) { /* * Fillin the flags so cipher modules can see s/w * crypto requirements and potentially allocate * different state and/or attach different method * pointers. */ key->wk_flags = flags; keyctx = cip->ic_attach(vap, key); if (keyctx == NULL) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: unable to attach cipher %s\n", __func__, cip->ic_name); key->wk_flags = oflags; /* restore old flags */ vap->iv_stats.is_crypto_attachfail++; return 0; } cipher_detach(key); key->wk_cipher = cip; /* XXX refcnt? */ key->wk_private = keyctx; } /* * Ask the driver for a key index if we don't have one. * Note that entries in the global key table always have * an index; this means it's safe to call this routine * for these entries just to setup the reference to the * cipher template. Note also that when using software * crypto we also call the driver to give us a key index. */ if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) { if (!dev_key_alloc(vap, key, &keyix, &rxkeyix)) { /* * Unable to setup driver state. */ vap->iv_stats.is_crypto_keyfail++; IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: unable to setup cipher %s\n", __func__, cip->ic_name); return 0; } if (key->wk_flags != flags) { /* * Driver overrode flags we setup; typically because * resources were unavailable to handle _this_ key. * Re-attach the cipher context to allow cipher * modules to handle differing requirements. */ IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: driver override for cipher %s, flags " "0x%x -> 0x%x\n", __func__, cip->ic_name, oflags, key->wk_flags); keyctx = cip->ic_attach(vap, key); if (keyctx == NULL) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: unable to attach cipher %s with " "flags 0x%x\n", __func__, cip->ic_name, key->wk_flags); key->wk_flags = oflags; /* restore old flags */ vap->iv_stats.is_crypto_attachfail++; return 0; } cipher_detach(key); key->wk_cipher = cip; /* XXX refcnt? */ key->wk_private = keyctx; } key->wk_keyix = keyix; key->wk_rxkeyix = rxkeyix; key->wk_flags |= IEEE80211_KEY_DEVKEY; } return 1; } /* * Remove the key (no locking, for internal use). */ static int _ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key) { KASSERT(key->wk_cipher != NULL, ("No cipher!")); IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n", __func__, key->wk_cipher->ic_name, key->wk_keyix, key->wk_flags, key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc, key->wk_keylen); if (key->wk_flags & IEEE80211_KEY_DEVKEY) { /* * Remove hardware entry. */ /* XXX key cache */ if (!dev_key_delete(vap, key)) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: driver did not delete key index %u\n", __func__, key->wk_keyix); vap->iv_stats.is_crypto_delkey++; /* XXX recovery? */ } } cipher_detach(key); memset(key, 0, sizeof(*key)); ieee80211_crypto_resetkey(vap, key, IEEE80211_KEYIX_NONE); return 1; } /* * Remove the specified key. */ int ieee80211_crypto_delkey(struct ieee80211vap *vap, struct ieee80211_key *key) { int status; ieee80211_key_update_begin(vap); status = _ieee80211_crypto_delkey(vap, key); ieee80211_key_update_end(vap); return status; } /* * Clear the global key table. */ void ieee80211_crypto_delglobalkeys(struct ieee80211vap *vap) { int i; ieee80211_key_update_begin(vap); for (i = 0; i < IEEE80211_WEP_NKID; i++) (void) _ieee80211_crypto_delkey(vap, &vap->iv_nw_keys[i]); ieee80211_key_update_end(vap); } /* * Set the contents of the specified key. * * Locking must be handled by the caller using: * ieee80211_key_update_begin(vap); * ieee80211_key_update_end(vap); */ int ieee80211_crypto_setkey(struct ieee80211vap *vap, struct ieee80211_key *key) { const struct ieee80211_cipher *cip = key->wk_cipher; KASSERT(cip != NULL, ("No cipher!")); IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n", __func__, cip->ic_name, key->wk_keyix, key->wk_flags, ether_sprintf(key->wk_macaddr), key->wk_keyrsc[IEEE80211_NONQOS_TID], key->wk_keytsc, key->wk_keylen); if ((key->wk_flags & IEEE80211_KEY_DEVKEY) == 0) { /* XXX nothing allocated, should not happen */ IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: no device key setup done; should not happen!\n", __func__); vap->iv_stats.is_crypto_setkey_nokey++; return 0; } /* * Give cipher a chance to validate key contents. * XXX should happen before modifying state. */ if (!cip->ic_setkey(key)) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_CRYPTO, "%s: cipher %s rejected key index %u len %u flags 0x%x\n", __func__, cip->ic_name, key->wk_keyix, key->wk_keylen, key->wk_flags); vap->iv_stats.is_crypto_setkey_cipher++; return 0; } return dev_key_set(vap, key); } +uint8_t +ieee80211_crypto_get_keyid(struct ieee80211vap *vap, struct ieee80211_key *k) +{ + if (k >= &vap->iv_nw_keys[0] && + k < &vap->iv_nw_keys[IEEE80211_WEP_NKID]) + return (k - vap->iv_nw_keys); + else + return (0); +} + /* * Add privacy headers appropriate for the specified key. */ struct ieee80211_key * ieee80211_crypto_encap(struct ieee80211_node *ni, struct mbuf *m) { struct ieee80211vap *vap = ni->ni_vap; struct ieee80211_key *k; struct ieee80211_frame *wh; const struct ieee80211_cipher *cip; - uint8_t keyid; /* * Multicast traffic always uses the multicast key. * Otherwise if a unicast key is set we use that and * it is always key index 0. When no unicast key is * set we fall back to the default transmit key. */ wh = mtod(m, struct ieee80211_frame *); if (IEEE80211_IS_MULTICAST(wh->i_addr1) || IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE) { IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1, "no default transmit key (%s) deftxkey %u", __func__, vap->iv_def_txkey); vap->iv_stats.is_tx_nodefkey++; return NULL; } - keyid = vap->iv_def_txkey; k = &vap->iv_nw_keys[vap->iv_def_txkey]; - } else { - keyid = 0; + } else k = &ni->ni_ucastkey; - } + cip = k->wk_cipher; - return (cip->ic_encap(k, m, keyid<<6) ? k : NULL); + return (cip->ic_encap(k, m) ? k : NULL); } /* * Validate and strip privacy headers (and trailer) for a * received frame that has the WEP/Privacy bit set. */ struct ieee80211_key * ieee80211_crypto_decap(struct ieee80211_node *ni, struct mbuf *m, int hdrlen) { #define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN) #define IEEE80211_WEP_MINLEN \ (sizeof(struct ieee80211_frame) + \ IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN) struct ieee80211vap *vap = ni->ni_vap; struct ieee80211_key *k; struct ieee80211_frame *wh; const struct ieee80211_cipher *cip; uint8_t keyid; /* NB: this minimum size data frame could be bigger */ if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) { IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, "%s: WEP data frame too short, len %u\n", __func__, m->m_pkthdr.len); vap->iv_stats.is_rx_tooshort++; /* XXX need unique stat? */ return NULL; } /* * Locate the key. If unicast and there is no unicast * key then we fall back to the key id in the header. * This assumes unicast keys are only configured when * the key id in the header is meaningless (typically 0). */ wh = mtod(m, struct ieee80211_frame *); m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid); if (IEEE80211_IS_MULTICAST(wh->i_addr1) || IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) k = &vap->iv_nw_keys[keyid >> 6]; else k = &ni->ni_ucastkey; /* * Insure crypto header is contiguous for all decap work. */ cip = k->wk_cipher; if (m->m_len < hdrlen + cip->ic_header && (m = m_pullup(m, hdrlen + cip->ic_header)) == NULL) { IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "unable to pullup %s header", cip->ic_name); vap->iv_stats.is_rx_wepfail++; /* XXX */ return NULL; } return (cip->ic_decap(k, m, hdrlen) ? k : NULL); #undef IEEE80211_WEP_MINLEN #undef IEEE80211_WEP_HDRLEN } static void load_ucastkey(void *arg, struct ieee80211_node *ni) { struct ieee80211vap *vap = ni->ni_vap; struct ieee80211_key *k; if (vap->iv_state != IEEE80211_S_RUN) return; k = &ni->ni_ucastkey; if (k->wk_flags & IEEE80211_KEY_DEVKEY) dev_key_set(vap, k); } /* * Re-load all keys known to the 802.11 layer that may * have hardware state backing them. This is used by * drivers on resume to push keys down into the device. */ void ieee80211_crypto_reload_keys(struct ieee80211com *ic) { struct ieee80211vap *vap; int i; /* * Keys in the global key table of each vap. */ /* NB: used only during resume so don't lock for now */ TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { if (vap->iv_state != IEEE80211_S_RUN) continue; for (i = 0; i < IEEE80211_WEP_NKID; i++) { const struct ieee80211_key *k = &vap->iv_nw_keys[i]; if (k->wk_flags & IEEE80211_KEY_DEVKEY) dev_key_set(vap, k); } } /* * Unicast keys. */ ieee80211_iterate_nodes(&ic->ic_sta, load_ucastkey, NULL); } Index: head/sys/net80211/ieee80211_crypto.h =================================================================== --- head/sys/net80211/ieee80211_crypto.h (revision 288522) +++ head/sys/net80211/ieee80211_crypto.h (revision 288523) @@ -1,247 +1,248 @@ /*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ #ifndef _NET80211_IEEE80211_CRYPTO_H_ #define _NET80211_IEEE80211_CRYPTO_H_ /* * 802.11 protocol crypto-related definitions. */ #define IEEE80211_KEYBUF_SIZE 16 #define IEEE80211_MICBUF_SIZE (8+8) /* space for both tx+rx keys */ /* * Old WEP-style key. Deprecated. */ struct ieee80211_wepkey { u_int wk_len; /* key length in bytes */ uint8_t wk_key[IEEE80211_KEYBUF_SIZE]; }; struct ieee80211_rsnparms { uint8_t rsn_mcastcipher; /* mcast/group cipher */ uint8_t rsn_mcastkeylen; /* mcast key length */ uint8_t rsn_ucastcipher; /* selected unicast cipher */ uint8_t rsn_ucastkeylen; /* unicast key length */ uint8_t rsn_keymgmt; /* selected key mgmt algo */ uint16_t rsn_caps; /* capabilities */ }; struct ieee80211_cipher; /* * Crypto key state. There is sufficient room for all supported * ciphers (see below). The underlying ciphers are handled * separately through loadable cipher modules that register with * the generic crypto support. A key has a reference to an instance * of the cipher; any per-key state is hung off wk_private by the * cipher when it is attached. Ciphers are automatically called * to detach and cleanup any such state when the key is deleted. * * The generic crypto support handles encap/decap of cipher-related * frame contents for both hardware- and software-based implementations. * A key requiring software crypto support is automatically flagged and * the cipher is expected to honor this and do the necessary work. * Ciphers such as TKIP may also support mixed hardware/software * encrypt/decrypt and MIC processing. */ typedef uint16_t ieee80211_keyix; /* h/w key index */ struct ieee80211_key { uint8_t wk_keylen; /* key length in bytes */ uint8_t wk_pad; uint16_t wk_flags; #define IEEE80211_KEY_XMIT 0x0001 /* key used for xmit */ #define IEEE80211_KEY_RECV 0x0002 /* key used for recv */ #define IEEE80211_KEY_GROUP 0x0004 /* key used for WPA group operation */ #define IEEE80211_KEY_NOREPLAY 0x0008 /* ignore replay failures */ #define IEEE80211_KEY_SWENCRYPT 0x0010 /* host-based encrypt */ #define IEEE80211_KEY_SWDECRYPT 0x0020 /* host-based decrypt */ #define IEEE80211_KEY_SWENMIC 0x0040 /* host-based enmic */ #define IEEE80211_KEY_SWDEMIC 0x0080 /* host-based demic */ #define IEEE80211_KEY_DEVKEY 0x0100 /* device key request completed */ #define IEEE80211_KEY_CIPHER0 0x1000 /* cipher-specific action 0 */ #define IEEE80211_KEY_CIPHER1 0x2000 /* cipher-specific action 1 */ ieee80211_keyix wk_keyix; /* h/w key index */ ieee80211_keyix wk_rxkeyix; /* optional h/w rx key index */ uint8_t wk_key[IEEE80211_KEYBUF_SIZE+IEEE80211_MICBUF_SIZE]; #define wk_txmic wk_key+IEEE80211_KEYBUF_SIZE+0 /* XXX can't () right */ #define wk_rxmic wk_key+IEEE80211_KEYBUF_SIZE+8 /* XXX can't () right */ /* key receive sequence counter */ uint64_t wk_keyrsc[IEEE80211_TID_SIZE]; uint64_t wk_keytsc; /* key transmit sequence counter */ const struct ieee80211_cipher *wk_cipher; void *wk_private; /* private cipher state */ uint8_t wk_macaddr[IEEE80211_ADDR_LEN]; }; #define IEEE80211_KEY_COMMON /* common flags passed in by apps */\ (IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV | IEEE80211_KEY_GROUP | \ IEEE80211_KEY_NOREPLAY) #define IEEE80211_KEY_DEVICE /* flags owned by device driver */\ (IEEE80211_KEY_DEVKEY|IEEE80211_KEY_CIPHER0|IEEE80211_KEY_CIPHER1) #define IEEE80211_KEY_SWCRYPT \ (IEEE80211_KEY_SWENCRYPT | IEEE80211_KEY_SWDECRYPT) #define IEEE80211_KEY_SWMIC (IEEE80211_KEY_SWENMIC | IEEE80211_KEY_SWDEMIC) #define IEEE80211_KEY_BITS \ "\20\1XMIT\2RECV\3GROUP\4SWENCRYPT\5SWDECRYPT\6SWENMIC\7SWDEMIC" \ "\10DEVKEY\11CIPHER0\12CIPHER1" #define IEEE80211_KEYIX_NONE ((ieee80211_keyix) -1) /* * NB: these values are ordered carefully; there are lots of * of implications in any reordering. Beware that 4 is used * only to indicate h/w TKIP MIC support in driver capabilities; * there is no separate cipher support (it's rolled into the * TKIP cipher support). */ #define IEEE80211_CIPHER_WEP 0 #define IEEE80211_CIPHER_TKIP 1 #define IEEE80211_CIPHER_AES_OCB 2 #define IEEE80211_CIPHER_AES_CCM 3 #define IEEE80211_CIPHER_TKIPMIC 4 /* TKIP MIC capability */ #define IEEE80211_CIPHER_CKIP 5 #define IEEE80211_CIPHER_NONE 6 /* pseudo value */ #define IEEE80211_CIPHER_MAX (IEEE80211_CIPHER_NONE+1) /* capability bits in ic_cryptocaps/iv_cryptocaps */ #define IEEE80211_CRYPTO_WEP (1<wk_cipher == &ieee80211_cipher_none) void ieee80211_crypto_register(const struct ieee80211_cipher *); void ieee80211_crypto_unregister(const struct ieee80211_cipher *); int ieee80211_crypto_available(u_int cipher); +uint8_t ieee80211_crypto_get_keyid(struct ieee80211vap *vap, + struct ieee80211_key *k); struct ieee80211_key *ieee80211_crypto_encap(struct ieee80211_node *, struct mbuf *); struct ieee80211_key *ieee80211_crypto_decap(struct ieee80211_node *, struct mbuf *, int); /* * Check and remove any MIC. */ static __inline int ieee80211_crypto_demic(struct ieee80211vap *vap, struct ieee80211_key *k, struct mbuf *m, int force) { const struct ieee80211_cipher *cip = k->wk_cipher; return (cip->ic_miclen > 0 ? cip->ic_demic(k, m, force) : 1); } /* * Add any MIC. */ static __inline int ieee80211_crypto_enmic(struct ieee80211vap *vap, struct ieee80211_key *k, struct mbuf *m, int force) { const struct ieee80211_cipher *cip = k->wk_cipher; return (cip->ic_miclen > 0 ? cip->ic_enmic(k, m, force) : 1); } /* * Reset key state to an unused state. The crypto * key allocation mechanism insures other state (e.g. * key data) is properly setup before a key is used. */ static __inline void ieee80211_crypto_resetkey(struct ieee80211vap *vap, struct ieee80211_key *k, ieee80211_keyix ix) { k->wk_cipher = &ieee80211_cipher_none; k->wk_private = k->wk_cipher->ic_attach(vap, k); k->wk_keyix = k->wk_rxkeyix = ix; k->wk_flags = IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV; } /* * Crypt-related notification methods. */ void ieee80211_notify_replay_failure(struct ieee80211vap *, const struct ieee80211_frame *, const struct ieee80211_key *, uint64_t rsc, int tid); void ieee80211_notify_michael_failure(struct ieee80211vap *, const struct ieee80211_frame *, u_int keyix); #endif /* defined(__KERNEL__) || defined(_KERNEL) */ #endif /* _NET80211_IEEE80211_CRYPTO_H_ */ Index: head/sys/net80211/ieee80211_crypto_ccmp.c =================================================================== --- head/sys/net80211/ieee80211_crypto_ccmp.c (revision 288522) +++ head/sys/net80211/ieee80211_crypto_ccmp.c (revision 288523) @@ -1,635 +1,639 @@ /*- * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * IEEE 802.11i AES-CCMP crypto support. * * Part of this module is derived from similar code in the Host * AP driver. The code is used with the consent of the author and * it's license is included below. */ #include "opt_wlan.h" #include #include #include #include #include #include #include #include #include #include #include #include #define AES_BLOCK_LEN 16 struct ccmp_ctx { struct ieee80211vap *cc_vap; /* for diagnostics+statistics */ struct ieee80211com *cc_ic; rijndael_ctx cc_aes; }; static void *ccmp_attach(struct ieee80211vap *, struct ieee80211_key *); static void ccmp_detach(struct ieee80211_key *); static int ccmp_setkey(struct ieee80211_key *); -static int ccmp_encap(struct ieee80211_key *k, struct mbuf *, uint8_t keyid); +static int ccmp_encap(struct ieee80211_key *, struct mbuf *); static int ccmp_decap(struct ieee80211_key *, struct mbuf *, int); static int ccmp_enmic(struct ieee80211_key *, struct mbuf *, int); static int ccmp_demic(struct ieee80211_key *, struct mbuf *, int); static const struct ieee80211_cipher ccmp = { .ic_name = "AES-CCM", .ic_cipher = IEEE80211_CIPHER_AES_CCM, .ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + IEEE80211_WEP_EXTIVLEN, .ic_trailer = IEEE80211_WEP_MICLEN, .ic_miclen = 0, .ic_attach = ccmp_attach, .ic_detach = ccmp_detach, .ic_setkey = ccmp_setkey, .ic_encap = ccmp_encap, .ic_decap = ccmp_decap, .ic_enmic = ccmp_enmic, .ic_demic = ccmp_demic, }; static int ccmp_encrypt(struct ieee80211_key *, struct mbuf *, int hdrlen); static int ccmp_decrypt(struct ieee80211_key *, u_int64_t pn, struct mbuf *, int hdrlen); /* number of references from net80211 layer */ static int nrefs = 0; static void * ccmp_attach(struct ieee80211vap *vap, struct ieee80211_key *k) { struct ccmp_ctx *ctx; ctx = (struct ccmp_ctx *) IEEE80211_MALLOC(sizeof(struct ccmp_ctx), M_80211_CRYPTO, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); if (ctx == NULL) { vap->iv_stats.is_crypto_nomem++; return NULL; } ctx->cc_vap = vap; ctx->cc_ic = vap->iv_ic; nrefs++; /* NB: we assume caller locking */ return ctx; } static void ccmp_detach(struct ieee80211_key *k) { struct ccmp_ctx *ctx = k->wk_private; IEEE80211_FREE(ctx, M_80211_CRYPTO); KASSERT(nrefs > 0, ("imbalanced attach/detach")); nrefs--; /* NB: we assume caller locking */ } static int ccmp_setkey(struct ieee80211_key *k) { struct ccmp_ctx *ctx = k->wk_private; if (k->wk_keylen != (128/NBBY)) { IEEE80211_DPRINTF(ctx->cc_vap, IEEE80211_MSG_CRYPTO, "%s: Invalid key length %u, expecting %u\n", __func__, k->wk_keylen, 128/NBBY); return 0; } if (k->wk_flags & IEEE80211_KEY_SWENCRYPT) rijndael_set_key(&ctx->cc_aes, k->wk_key, k->wk_keylen*NBBY); return 1; } /* * Add privacy headers appropriate for the specified key. */ static int -ccmp_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) +ccmp_encap(struct ieee80211_key *k, struct mbuf *m) { struct ccmp_ctx *ctx = k->wk_private; struct ieee80211com *ic = ctx->cc_ic; + struct ieee80211vap *vap = ctx->cc_vap; uint8_t *ivp; + uint8_t keyid; int hdrlen; hdrlen = ieee80211_hdrspace(ic, mtod(m, void *)); /* * Copy down 802.11 header and add the IV, KeyID, and ExtIV. */ M_PREPEND(m, ccmp.ic_header, M_NOWAIT); if (m == NULL) return 0; ivp = mtod(m, uint8_t *); ovbcopy(ivp + ccmp.ic_header, ivp, hdrlen); ivp += hdrlen; + + keyid = ieee80211_crypto_get_keyid(vap, k) << 6; k->wk_keytsc++; /* XXX wrap at 48 bits */ ivp[0] = k->wk_keytsc >> 0; /* PN0 */ ivp[1] = k->wk_keytsc >> 8; /* PN1 */ ivp[2] = 0; /* Reserved */ ivp[3] = keyid | IEEE80211_WEP_EXTIV; /* KeyID | ExtID */ ivp[4] = k->wk_keytsc >> 16; /* PN2 */ ivp[5] = k->wk_keytsc >> 24; /* PN3 */ ivp[6] = k->wk_keytsc >> 32; /* PN4 */ ivp[7] = k->wk_keytsc >> 40; /* PN5 */ /* * Finally, do software encrypt if needed. */ if ((k->wk_flags & IEEE80211_KEY_SWENCRYPT) && !ccmp_encrypt(k, m, hdrlen)) return 0; return 1; } /* * Add MIC to the frame as needed. */ static int ccmp_enmic(struct ieee80211_key *k, struct mbuf *m, int force) { return 1; } static __inline uint64_t READ_6(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5) { uint32_t iv32 = (b0 << 0) | (b1 << 8) | (b2 << 16) | (b3 << 24); uint16_t iv16 = (b4 << 0) | (b5 << 8); return (((uint64_t)iv16) << 32) | iv32; } /* * Validate and strip privacy headers (and trailer) for a * received frame. The specified key should be correct but * is also verified. */ static int ccmp_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) { struct ccmp_ctx *ctx = k->wk_private; struct ieee80211vap *vap = ctx->cc_vap; struct ieee80211_frame *wh; uint8_t *ivp, tid; uint64_t pn; /* * Header should have extended IV and sequence number; * verify the former and validate the latter. */ wh = mtod(m, struct ieee80211_frame *); ivp = mtod(m, uint8_t *) + hdrlen; if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) { /* * No extended IV; discard frame. */ IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "%s", "missing ExtIV for AES-CCM cipher"); vap->iv_stats.is_rx_ccmpformat++; return 0; } tid = ieee80211_gettid(wh); pn = READ_6(ivp[0], ivp[1], ivp[4], ivp[5], ivp[6], ivp[7]); if (pn <= k->wk_keyrsc[tid] && (k->wk_flags & IEEE80211_KEY_NOREPLAY) == 0) { /* * Replay violation. */ ieee80211_notify_replay_failure(vap, wh, k, pn, tid); vap->iv_stats.is_rx_ccmpreplay++; return 0; } /* * Check if the device handled the decrypt in hardware. * If so we just strip the header; otherwise we need to * handle the decrypt in software. Note that for the * latter we leave the header in place for use in the * decryption work. */ if ((k->wk_flags & IEEE80211_KEY_SWDECRYPT) && !ccmp_decrypt(k, pn, m, hdrlen)) return 0; /* * Copy up 802.11 header and strip crypto bits. */ ovbcopy(mtod(m, void *), mtod(m, uint8_t *) + ccmp.ic_header, hdrlen); m_adj(m, ccmp.ic_header); m_adj(m, -ccmp.ic_trailer); /* * Ok to update rsc now. */ k->wk_keyrsc[tid] = pn; return 1; } /* * Verify and strip MIC from the frame. */ static int ccmp_demic(struct ieee80211_key *k, struct mbuf *m, int force) { return 1; } static __inline void xor_block(uint8_t *b, const uint8_t *a, size_t len) { int i; for (i = 0; i < len; i++) b[i] ^= a[i]; } /* * Host AP crypt: host-based CCMP encryption implementation for Host AP driver * * Copyright (c) 2003-2004, Jouni Malinen * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. See README and COPYING for * more details. * * Alternatively, this software may be distributed under the terms of BSD * license. */ static void ccmp_init_blocks(rijndael_ctx *ctx, struct ieee80211_frame *wh, u_int64_t pn, size_t dlen, uint8_t b0[AES_BLOCK_LEN], uint8_t aad[2 * AES_BLOCK_LEN], uint8_t auth[AES_BLOCK_LEN], uint8_t s0[AES_BLOCK_LEN]) { #define IS_QOS_DATA(wh) IEEE80211_QOS_HAS_SEQ(wh) /* CCM Initial Block: * Flag (Include authentication header, M=3 (8-octet MIC), * L=1 (2-octet Dlen)) * Nonce: 0x00 | A2 | PN * Dlen */ b0[0] = 0x59; /* NB: b0[1] set below */ IEEE80211_ADDR_COPY(b0 + 2, wh->i_addr2); b0[8] = pn >> 40; b0[9] = pn >> 32; b0[10] = pn >> 24; b0[11] = pn >> 16; b0[12] = pn >> 8; b0[13] = pn >> 0; b0[14] = (dlen >> 8) & 0xff; b0[15] = dlen & 0xff; /* AAD: * FC with bits 4..6 and 11..13 masked to zero; 14 is always one * A1 | A2 | A3 * SC with bits 4..15 (seq#) masked to zero * A4 (if present) * QC (if present) */ aad[0] = 0; /* AAD length >> 8 */ /* NB: aad[1] set below */ aad[2] = wh->i_fc[0] & 0x8f; /* XXX magic #s */ aad[3] = wh->i_fc[1] & 0xc7; /* XXX magic #s */ /* NB: we know 3 addresses are contiguous */ memcpy(aad + 4, wh->i_addr1, 3 * IEEE80211_ADDR_LEN); aad[22] = wh->i_seq[0] & IEEE80211_SEQ_FRAG_MASK; aad[23] = 0; /* all bits masked */ /* * Construct variable-length portion of AAD based * on whether this is a 4-address frame/QOS frame. * We always zero-pad to 32 bytes before running it * through the cipher. * * We also fill in the priority bits of the CCM * initial block as we know whether or not we have * a QOS frame. */ if (IEEE80211_IS_DSTODS(wh)) { IEEE80211_ADDR_COPY(aad + 24, ((struct ieee80211_frame_addr4 *)wh)->i_addr4); if (IS_QOS_DATA(wh)) { struct ieee80211_qosframe_addr4 *qwh4 = (struct ieee80211_qosframe_addr4 *) wh; aad[30] = qwh4->i_qos[0] & 0x0f;/* just priority bits */ aad[31] = 0; b0[1] = aad[30]; aad[1] = 22 + IEEE80211_ADDR_LEN + 2; } else { *(uint16_t *)&aad[30] = 0; b0[1] = 0; aad[1] = 22 + IEEE80211_ADDR_LEN; } } else { if (IS_QOS_DATA(wh)) { struct ieee80211_qosframe *qwh = (struct ieee80211_qosframe*) wh; aad[24] = qwh->i_qos[0] & 0x0f; /* just priority bits */ aad[25] = 0; b0[1] = aad[24]; aad[1] = 22 + 2; } else { *(uint16_t *)&aad[24] = 0; b0[1] = 0; aad[1] = 22; } *(uint16_t *)&aad[26] = 0; *(uint32_t *)&aad[28] = 0; } /* Start with the first block and AAD */ rijndael_encrypt(ctx, b0, auth); xor_block(auth, aad, AES_BLOCK_LEN); rijndael_encrypt(ctx, auth, auth); xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN); rijndael_encrypt(ctx, auth, auth); b0[0] &= 0x07; b0[14] = b0[15] = 0; rijndael_encrypt(ctx, b0, s0); #undef IS_QOS_DATA } #define CCMP_ENCRYPT(_i, _b, _b0, _pos, _e, _len) do { \ /* Authentication */ \ xor_block(_b, _pos, _len); \ rijndael_encrypt(&ctx->cc_aes, _b, _b); \ /* Encryption, with counter */ \ _b0[14] = (_i >> 8) & 0xff; \ _b0[15] = _i & 0xff; \ rijndael_encrypt(&ctx->cc_aes, _b0, _e); \ xor_block(_pos, _e, _len); \ } while (0) static int ccmp_encrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen) { struct ccmp_ctx *ctx = key->wk_private; struct ieee80211_frame *wh; struct mbuf *m = m0; int data_len, i, space; uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN], e[AES_BLOCK_LEN], s0[AES_BLOCK_LEN]; uint8_t *pos; ctx->cc_vap->iv_stats.is_crypto_ccmp++; wh = mtod(m, struct ieee80211_frame *); data_len = m->m_pkthdr.len - (hdrlen + ccmp.ic_header); ccmp_init_blocks(&ctx->cc_aes, wh, key->wk_keytsc, data_len, b0, aad, b, s0); i = 1; pos = mtod(m, uint8_t *) + hdrlen + ccmp.ic_header; /* NB: assumes header is entirely in first mbuf */ space = m->m_len - (hdrlen + ccmp.ic_header); for (;;) { if (space > data_len) space = data_len; /* * Do full blocks. */ while (space >= AES_BLOCK_LEN) { CCMP_ENCRYPT(i, b, b0, pos, e, AES_BLOCK_LEN); pos += AES_BLOCK_LEN, space -= AES_BLOCK_LEN; data_len -= AES_BLOCK_LEN; i++; } if (data_len <= 0) /* no more data */ break; m = m->m_next; if (m == NULL) { /* last buffer */ if (space != 0) { /* * Short last block. */ CCMP_ENCRYPT(i, b, b0, pos, e, space); } break; } if (space != 0) { uint8_t *pos_next; int space_next; int len, dl, sp; struct mbuf *n; /* * Block straddles one or more mbufs, gather data * into the block buffer b, apply the cipher, then * scatter the results back into the mbuf chain. * The buffer will automatically get space bytes * of data at offset 0 copied in+out by the * CCMP_ENCRYPT request so we must take care of * the remaining data. */ n = m; dl = data_len; sp = space; for (;;) { pos_next = mtod(n, uint8_t *); len = min(dl, AES_BLOCK_LEN); space_next = len > sp ? len - sp : 0; if (n->m_len >= space_next) { /* * This mbuf has enough data; just grab * what we need and stop. */ xor_block(b+sp, pos_next, space_next); break; } /* * This mbuf's contents are insufficient, * take 'em all and prepare to advance to * the next mbuf. */ xor_block(b+sp, pos_next, n->m_len); sp += n->m_len, dl -= n->m_len; n = n->m_next; if (n == NULL) break; } CCMP_ENCRYPT(i, b, b0, pos, e, space); /* NB: just like above, but scatter data to mbufs */ dl = data_len; sp = space; for (;;) { pos_next = mtod(m, uint8_t *); len = min(dl, AES_BLOCK_LEN); space_next = len > sp ? len - sp : 0; if (m->m_len >= space_next) { xor_block(pos_next, e+sp, space_next); break; } xor_block(pos_next, e+sp, m->m_len); sp += m->m_len, dl -= m->m_len; m = m->m_next; if (m == NULL) goto done; } /* * Do bookkeeping. m now points to the last mbuf * we grabbed data from. We know we consumed a * full block of data as otherwise we'd have hit * the end of the mbuf chain, so deduct from data_len. * Otherwise advance the block number (i) and setup * pos+space to reflect contents of the new mbuf. */ data_len -= AES_BLOCK_LEN; i++; pos = pos_next + space_next; space = m->m_len - space_next; } else { /* * Setup for next buffer. */ pos = mtod(m, uint8_t *); space = m->m_len; } } done: /* tack on MIC */ xor_block(b, s0, ccmp.ic_trailer); return m_append(m0, ccmp.ic_trailer, b); } #undef CCMP_ENCRYPT #define CCMP_DECRYPT(_i, _b, _b0, _pos, _a, _len) do { \ /* Decrypt, with counter */ \ _b0[14] = (_i >> 8) & 0xff; \ _b0[15] = _i & 0xff; \ rijndael_encrypt(&ctx->cc_aes, _b0, _b); \ xor_block(_pos, _b, _len); \ /* Authentication */ \ xor_block(_a, _pos, _len); \ rijndael_encrypt(&ctx->cc_aes, _a, _a); \ } while (0) static int ccmp_decrypt(struct ieee80211_key *key, u_int64_t pn, struct mbuf *m, int hdrlen) { struct ccmp_ctx *ctx = key->wk_private; struct ieee80211vap *vap = ctx->cc_vap; struct ieee80211_frame *wh; uint8_t aad[2 * AES_BLOCK_LEN]; uint8_t b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN], a[AES_BLOCK_LEN]; uint8_t mic[AES_BLOCK_LEN]; size_t data_len; int i; uint8_t *pos; u_int space; ctx->cc_vap->iv_stats.is_crypto_ccmp++; wh = mtod(m, struct ieee80211_frame *); data_len = m->m_pkthdr.len - (hdrlen + ccmp.ic_header + ccmp.ic_trailer); ccmp_init_blocks(&ctx->cc_aes, wh, pn, data_len, b0, aad, a, b); m_copydata(m, m->m_pkthdr.len - ccmp.ic_trailer, ccmp.ic_trailer, mic); xor_block(mic, b, ccmp.ic_trailer); i = 1; pos = mtod(m, uint8_t *) + hdrlen + ccmp.ic_header; space = m->m_len - (hdrlen + ccmp.ic_header); for (;;) { if (space > data_len) space = data_len; while (space >= AES_BLOCK_LEN) { CCMP_DECRYPT(i, b, b0, pos, a, AES_BLOCK_LEN); pos += AES_BLOCK_LEN, space -= AES_BLOCK_LEN; data_len -= AES_BLOCK_LEN; i++; } if (data_len <= 0) /* no more data */ break; m = m->m_next; if (m == NULL) { /* last buffer */ if (space != 0) /* short last block */ CCMP_DECRYPT(i, b, b0, pos, a, space); break; } if (space != 0) { uint8_t *pos_next; u_int space_next; u_int len; /* * Block straddles buffers, split references. We * do not handle splits that require >2 buffers * since rx'd frames are never badly fragmented * because drivers typically recv in clusters. */ pos_next = mtod(m, uint8_t *); len = min(data_len, AES_BLOCK_LEN); space_next = len > space ? len - space : 0; KASSERT(m->m_len >= space_next, ("not enough data in following buffer, " "m_len %u need %u\n", m->m_len, space_next)); xor_block(b+space, pos_next, space_next); CCMP_DECRYPT(i, b, b0, pos, a, space); xor_block(pos_next, b+space, space_next); data_len -= len; i++; pos = pos_next + space_next; space = m->m_len - space_next; } else { /* * Setup for next buffer. */ pos = mtod(m, uint8_t *); space = m->m_len; } } if (memcmp(mic, a, ccmp.ic_trailer) != 0) { IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "%s", "AES-CCM decrypt failed; MIC mismatch"); vap->iv_stats.is_rx_ccmpmic++; return 0; } return 1; } #undef CCMP_DECRYPT /* * Module glue. */ IEEE80211_CRYPTO_MODULE(ccmp, 1); Index: head/sys/net80211/ieee80211_crypto_none.c =================================================================== --- head/sys/net80211/ieee80211_crypto_none.c (revision 288522) +++ head/sys/net80211/ieee80211_crypto_none.c (revision 288523) @@ -1,144 +1,147 @@ /*- * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * IEEE 802.11 NULL crypto support. */ #include "opt_wlan.h" #include #include #include #include #include #include #include #include #include #include static void *none_attach(struct ieee80211vap *, struct ieee80211_key *); static void none_detach(struct ieee80211_key *); static int none_setkey(struct ieee80211_key *); -static int none_encap(struct ieee80211_key *, struct mbuf *, uint8_t); +static int none_encap(struct ieee80211_key *, struct mbuf *); static int none_decap(struct ieee80211_key *, struct mbuf *, int); static int none_enmic(struct ieee80211_key *, struct mbuf *, int); static int none_demic(struct ieee80211_key *, struct mbuf *, int); const struct ieee80211_cipher ieee80211_cipher_none = { .ic_name = "NONE", .ic_cipher = IEEE80211_CIPHER_NONE, .ic_header = 0, .ic_trailer = 0, .ic_miclen = 0, .ic_attach = none_attach, .ic_detach = none_detach, .ic_setkey = none_setkey, .ic_encap = none_encap, .ic_decap = none_decap, .ic_enmic = none_enmic, .ic_demic = none_demic, }; static void * none_attach(struct ieee80211vap *vap, struct ieee80211_key *k) { return vap; /* for diagnostics+stats */ } static void none_detach(struct ieee80211_key *k) { (void) k; } static int none_setkey(struct ieee80211_key *k) { (void) k; return 1; } static int -none_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) +none_encap(struct ieee80211_key *k, struct mbuf *m) { struct ieee80211vap *vap = k->wk_private; #ifdef IEEE80211_DEBUG struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); #endif + uint8_t keyid; + keyid = ieee80211_crypto_get_keyid(vap, k); + /* * The specified key is not setup; this can * happen, at least, when changing keys. */ IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1, - "key id %u is not set (encap)", keyid>>6); + "key id %u is not set (encap)", keyid); vap->iv_stats.is_tx_badcipher++; return 0; } static int none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) { struct ieee80211vap *vap = k->wk_private; #ifdef IEEE80211_DEBUG struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); const uint8_t *ivp = (const uint8_t *)&wh[1]; #endif /* * The specified key is not setup; this can * happen, at least, when changing keys. */ /* XXX useful to know dst too */ IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6); vap->iv_stats.is_rx_badkeyid++; return 0; } static int none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) { struct ieee80211vap *vap = k->wk_private; vap->iv_stats.is_tx_badcipher++; return 0; } static int none_demic(struct ieee80211_key *k, struct mbuf *m, int force) { struct ieee80211vap *vap = k->wk_private; vap->iv_stats.is_rx_badkeyid++; return 0; } Index: head/sys/net80211/ieee80211_crypto_tkip.c =================================================================== --- head/sys/net80211/ieee80211_crypto_tkip.c (revision 288522) +++ head/sys/net80211/ieee80211_crypto_tkip.c (revision 288523) @@ -1,999 +1,1002 @@ /*- * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * IEEE 802.11i TKIP crypto support. * * Part of this module is derived from similar code in the Host * AP driver. The code is used with the consent of the author and * it's license is included below. */ #include "opt_wlan.h" #include #include #include #include #include #include #include #include #include #include #include #include static void *tkip_attach(struct ieee80211vap *, struct ieee80211_key *); static void tkip_detach(struct ieee80211_key *); static int tkip_setkey(struct ieee80211_key *); -static int tkip_encap(struct ieee80211_key *, struct mbuf *m, uint8_t keyid); +static int tkip_encap(struct ieee80211_key *, struct mbuf *); static int tkip_enmic(struct ieee80211_key *, struct mbuf *, int); static int tkip_decap(struct ieee80211_key *, struct mbuf *, int); static int tkip_demic(struct ieee80211_key *, struct mbuf *, int); static const struct ieee80211_cipher tkip = { .ic_name = "TKIP", .ic_cipher = IEEE80211_CIPHER_TKIP, .ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + IEEE80211_WEP_EXTIVLEN, .ic_trailer = IEEE80211_WEP_CRCLEN, .ic_miclen = IEEE80211_WEP_MICLEN, .ic_attach = tkip_attach, .ic_detach = tkip_detach, .ic_setkey = tkip_setkey, .ic_encap = tkip_encap, .ic_decap = tkip_decap, .ic_enmic = tkip_enmic, .ic_demic = tkip_demic, }; typedef uint8_t u8; typedef uint16_t u16; typedef uint32_t __u32; typedef uint32_t u32; struct tkip_ctx { struct ieee80211vap *tc_vap; /* for diagnostics+statistics */ u16 tx_ttak[5]; int tx_phase1_done; u8 tx_rc4key[16]; /* XXX for test module; make locals? */ u16 rx_ttak[5]; int rx_phase1_done; u8 rx_rc4key[16]; /* XXX for test module; make locals? */ uint64_t rx_rsc; /* held until MIC verified */ }; static void michael_mic(struct tkip_ctx *, const u8 *key, struct mbuf *m, u_int off, size_t data_len, u8 mic[IEEE80211_WEP_MICLEN]); static int tkip_encrypt(struct tkip_ctx *, struct ieee80211_key *, struct mbuf *, int hdr_len); static int tkip_decrypt(struct tkip_ctx *, struct ieee80211_key *, struct mbuf *, int hdr_len); /* number of references from net80211 layer */ static int nrefs = 0; static void * tkip_attach(struct ieee80211vap *vap, struct ieee80211_key *k) { struct tkip_ctx *ctx; ctx = (struct tkip_ctx *) IEEE80211_MALLOC(sizeof(struct tkip_ctx), M_80211_CRYPTO, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); if (ctx == NULL) { vap->iv_stats.is_crypto_nomem++; return NULL; } ctx->tc_vap = vap; nrefs++; /* NB: we assume caller locking */ return ctx; } static void tkip_detach(struct ieee80211_key *k) { struct tkip_ctx *ctx = k->wk_private; IEEE80211_FREE(ctx, M_80211_CRYPTO); KASSERT(nrefs > 0, ("imbalanced attach/detach")); nrefs--; /* NB: we assume caller locking */ } static int tkip_setkey(struct ieee80211_key *k) { struct tkip_ctx *ctx = k->wk_private; if (k->wk_keylen != (128/NBBY)) { (void) ctx; /* XXX */ IEEE80211_DPRINTF(ctx->tc_vap, IEEE80211_MSG_CRYPTO, "%s: Invalid key length %u, expecting %u\n", __func__, k->wk_keylen, 128/NBBY); return 0; } k->wk_keytsc = 1; /* TSC starts at 1 */ ctx->rx_phase1_done = 0; return 1; } /* * Add privacy headers and do any s/w encryption required. */ static int -tkip_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) +tkip_encap(struct ieee80211_key *k, struct mbuf *m) { struct tkip_ctx *ctx = k->wk_private; struct ieee80211vap *vap = ctx->tc_vap; struct ieee80211com *ic = vap->iv_ic; uint8_t *ivp; + uint8_t keyid; int hdrlen; /* * Handle TKIP counter measures requirement. */ if (vap->iv_flags & IEEE80211_F_COUNTERM) { #ifdef IEEE80211_DEBUG struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); #endif IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "discard frame due to countermeasures (%s)", __func__); vap->iv_stats.is_crypto_tkipcm++; return 0; } hdrlen = ieee80211_hdrspace(ic, mtod(m, void *)); /* * Copy down 802.11 header and add the IV, KeyID, and ExtIV. */ M_PREPEND(m, tkip.ic_header, M_NOWAIT); if (m == NULL) return 0; ivp = mtod(m, uint8_t *); memmove(ivp, ivp + tkip.ic_header, hdrlen); ivp += hdrlen; + + keyid = ieee80211_crypto_get_keyid(vap, k) << 6; ivp[0] = k->wk_keytsc >> 8; /* TSC1 */ ivp[1] = (ivp[0] | 0x20) & 0x7f; /* WEP seed */ ivp[2] = k->wk_keytsc >> 0; /* TSC0 */ ivp[3] = keyid | IEEE80211_WEP_EXTIV; /* KeyID | ExtID */ ivp[4] = k->wk_keytsc >> 16; /* TSC2 */ ivp[5] = k->wk_keytsc >> 24; /* TSC3 */ ivp[6] = k->wk_keytsc >> 32; /* TSC4 */ ivp[7] = k->wk_keytsc >> 40; /* TSC5 */ /* * Finally, do software encrypt if needed. */ if (k->wk_flags & IEEE80211_KEY_SWENCRYPT) { if (!tkip_encrypt(ctx, k, m, hdrlen)) return 0; /* NB: tkip_encrypt handles wk_keytsc */ } else k->wk_keytsc++; return 1; } /* * Add MIC to the frame as needed. */ static int tkip_enmic(struct ieee80211_key *k, struct mbuf *m, int force) { struct tkip_ctx *ctx = k->wk_private; if (force || (k->wk_flags & IEEE80211_KEY_SWENMIC)) { struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); struct ieee80211vap *vap = ctx->tc_vap; struct ieee80211com *ic = vap->iv_ic; int hdrlen; uint8_t mic[IEEE80211_WEP_MICLEN]; vap->iv_stats.is_crypto_tkipenmic++; hdrlen = ieee80211_hdrspace(ic, wh); michael_mic(ctx, k->wk_txmic, m, hdrlen, m->m_pkthdr.len - hdrlen, mic); return m_append(m, tkip.ic_miclen, mic); } return 1; } static __inline uint64_t READ_6(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5) { uint32_t iv32 = (b0 << 0) | (b1 << 8) | (b2 << 16) | (b3 << 24); uint16_t iv16 = (b4 << 0) | (b5 << 8); return (((uint64_t)iv16) << 32) | iv32; } /* * Validate and strip privacy headers (and trailer) for a * received frame. If necessary, decrypt the frame using * the specified key. */ static int tkip_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) { struct tkip_ctx *ctx = k->wk_private; struct ieee80211vap *vap = ctx->tc_vap; struct ieee80211_frame *wh; uint8_t *ivp, tid; /* * Header should have extended IV and sequence number; * verify the former and validate the latter. */ wh = mtod(m, struct ieee80211_frame *); ivp = mtod(m, uint8_t *) + hdrlen; if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) { /* * No extended IV; discard frame. */ IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "%s", "missing ExtIV for TKIP cipher"); vap->iv_stats.is_rx_tkipformat++; return 0; } /* * Handle TKIP counter measures requirement. */ if (vap->iv_flags & IEEE80211_F_COUNTERM) { IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "discard frame due to countermeasures (%s)", __func__); vap->iv_stats.is_crypto_tkipcm++; return 0; } tid = ieee80211_gettid(wh); ctx->rx_rsc = READ_6(ivp[2], ivp[0], ivp[4], ivp[5], ivp[6], ivp[7]); if (ctx->rx_rsc <= k->wk_keyrsc[tid] && (k->wk_flags & IEEE80211_KEY_NOREPLAY) == 0) { /* * Replay violation; notify upper layer. */ ieee80211_notify_replay_failure(vap, wh, k, ctx->rx_rsc, tid); vap->iv_stats.is_rx_tkipreplay++; return 0; } /* * NB: We can't update the rsc in the key until MIC is verified. * * We assume we are not preempted between doing the check above * and updating wk_keyrsc when stripping the MIC in tkip_demic. * Otherwise we might process another packet and discard it as * a replay. */ /* * Check if the device handled the decrypt in hardware. * If so we just strip the header; otherwise we need to * handle the decrypt in software. */ if ((k->wk_flags & IEEE80211_KEY_SWDECRYPT) && !tkip_decrypt(ctx, k, m, hdrlen)) return 0; /* * Copy up 802.11 header and strip crypto bits. */ memmove(mtod(m, uint8_t *) + tkip.ic_header, mtod(m, void *), hdrlen); m_adj(m, tkip.ic_header); m_adj(m, -tkip.ic_trailer); return 1; } /* * Verify and strip MIC from the frame. */ static int tkip_demic(struct ieee80211_key *k, struct mbuf *m, int force) { struct tkip_ctx *ctx = k->wk_private; struct ieee80211_frame *wh; uint8_t tid; wh = mtod(m, struct ieee80211_frame *); if ((k->wk_flags & IEEE80211_KEY_SWDEMIC) || force) { struct ieee80211vap *vap = ctx->tc_vap; int hdrlen = ieee80211_hdrspace(vap->iv_ic, wh); u8 mic[IEEE80211_WEP_MICLEN]; u8 mic0[IEEE80211_WEP_MICLEN]; vap->iv_stats.is_crypto_tkipdemic++; michael_mic(ctx, k->wk_rxmic, m, hdrlen, m->m_pkthdr.len - (hdrlen + tkip.ic_miclen), mic); m_copydata(m, m->m_pkthdr.len - tkip.ic_miclen, tkip.ic_miclen, mic0); if (memcmp(mic, mic0, tkip.ic_miclen)) { /* NB: 802.11 layer handles statistic and debug msg */ ieee80211_notify_michael_failure(vap, wh, k->wk_rxkeyix != IEEE80211_KEYIX_NONE ? k->wk_rxkeyix : k->wk_keyix); return 0; } } /* * Strip MIC from the tail. */ m_adj(m, -tkip.ic_miclen); /* * Ok to update rsc now that MIC has been verified. */ tid = ieee80211_gettid(wh); k->wk_keyrsc[tid] = ctx->rx_rsc; return 1; } /* * Host AP crypt: host-based TKIP encryption implementation for Host AP driver * * Copyright (c) 2003-2004, Jouni Malinen * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. See README and COPYING for * more details. * * Alternatively, this software may be distributed under the terms of BSD * license. */ static const __u32 crc32_table[256] = { 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL }; static __inline u16 RotR1(u16 val) { return (val >> 1) | (val << 15); } static __inline u8 Lo8(u16 val) { return val & 0xff; } static __inline u8 Hi8(u16 val) { return val >> 8; } static __inline u16 Lo16(u32 val) { return val & 0xffff; } static __inline u16 Hi16(u32 val) { return val >> 16; } static __inline u16 Mk16(u8 hi, u8 lo) { return lo | (((u16) hi) << 8); } static __inline u16 Mk16_le(const u16 *v) { return le16toh(*v); } static const u16 Sbox[256] = { 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, }; static __inline u16 _S_(u16 v) { u16 t = Sbox[Hi8(v)]; return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8)); } #define PHASE1_LOOP_COUNT 8 static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32) { int i, j; /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ TTAK[0] = Lo16(IV32); TTAK[1] = Hi16(IV32); TTAK[2] = Mk16(TA[1], TA[0]); TTAK[3] = Mk16(TA[3], TA[2]); TTAK[4] = Mk16(TA[5], TA[4]); for (i = 0; i < PHASE1_LOOP_COUNT; i++) { j = 2 * (i & 1); TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; } } #ifndef _BYTE_ORDER #error "Don't know native byte order" #endif static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK, u16 IV16) { /* Make temporary area overlap WEP seed so that the final copy can be * avoided on little endian hosts. */ u16 *PPK = (u16 *) &WEPSeed[4]; /* Step 1 - make copy of TTAK and bring in TSC */ PPK[0] = TTAK[0]; PPK[1] = TTAK[1]; PPK[2] = TTAK[2]; PPK[3] = TTAK[3]; PPK[4] = TTAK[4]; PPK[5] = TTAK[4] + IV16; /* Step 2 - 96-bit bijective mixing using S-box */ PPK[0] += _S_(PPK[5] ^ Mk16_le((const u16 *) &TK[0])); PPK[1] += _S_(PPK[0] ^ Mk16_le((const u16 *) &TK[2])); PPK[2] += _S_(PPK[1] ^ Mk16_le((const u16 *) &TK[4])); PPK[3] += _S_(PPK[2] ^ Mk16_le((const u16 *) &TK[6])); PPK[4] += _S_(PPK[3] ^ Mk16_le((const u16 *) &TK[8])); PPK[5] += _S_(PPK[4] ^ Mk16_le((const u16 *) &TK[10])); PPK[0] += RotR1(PPK[5] ^ Mk16_le((const u16 *) &TK[12])); PPK[1] += RotR1(PPK[0] ^ Mk16_le((const u16 *) &TK[14])); PPK[2] += RotR1(PPK[1]); PPK[3] += RotR1(PPK[2]); PPK[4] += RotR1(PPK[3]); PPK[5] += RotR1(PPK[4]); /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value * WEPSeed[0..2] is transmitted as WEP IV */ WEPSeed[0] = Hi8(IV16); WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; WEPSeed[2] = Lo8(IV16); WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((const u16 *) &TK[0])) >> 1); #if _BYTE_ORDER == _BIG_ENDIAN { int i; for (i = 0; i < 6; i++) PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); } #endif } static void wep_encrypt(u8 *key, struct mbuf *m0, u_int off, size_t data_len, uint8_t icv[IEEE80211_WEP_CRCLEN]) { u32 i, j, k, crc; size_t buflen; u8 S[256]; u8 *pos; struct mbuf *m; #define S_SWAP(a,b) do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0) /* Setup RC4 state */ for (i = 0; i < 256; i++) S[i] = i; j = 0; for (i = 0; i < 256; i++) { j = (j + S[i] + key[i & 0x0f]) & 0xff; S_SWAP(i, j); } /* Compute CRC32 over unencrypted data and apply RC4 to data */ crc = ~0; i = j = 0; m = m0; pos = mtod(m, uint8_t *) + off; buflen = m->m_len - off; for (;;) { if (buflen > data_len) buflen = data_len; data_len -= buflen; for (k = 0; k < buflen; k++) { crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); *pos++ ^= S[(S[i] + S[j]) & 0xff]; } m = m->m_next; if (m == NULL) { KASSERT(data_len == 0, ("out of buffers with data_len %zu\n", data_len)); break; } pos = mtod(m, uint8_t *); buflen = m->m_len; } crc = ~crc; /* Append little-endian CRC32 and encrypt it to produce ICV */ icv[0] = crc; icv[1] = crc >> 8; icv[2] = crc >> 16; icv[3] = crc >> 24; for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) { i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); icv[k] ^= S[(S[i] + S[j]) & 0xff]; } } static int wep_decrypt(u8 *key, struct mbuf *m, u_int off, size_t data_len) { u32 i, j, k, crc; u8 S[256]; u8 *pos, icv[4]; size_t buflen; /* Setup RC4 state */ for (i = 0; i < 256; i++) S[i] = i; j = 0; for (i = 0; i < 256; i++) { j = (j + S[i] + key[i & 0x0f]) & 0xff; S_SWAP(i, j); } /* Apply RC4 to data and compute CRC32 over decrypted data */ crc = ~0; i = j = 0; pos = mtod(m, uint8_t *) + off; buflen = m->m_len - off; for (;;) { if (buflen > data_len) buflen = data_len; data_len -= buflen; for (k = 0; k < buflen; k++) { i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); *pos ^= S[(S[i] + S[j]) & 0xff]; crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); pos++; } m = m->m_next; if (m == NULL) { KASSERT(data_len == 0, ("out of buffers with data_len %zu\n", data_len)); break; } pos = mtod(m, uint8_t *); buflen = m->m_len; } crc = ~crc; /* Encrypt little-endian CRC32 and verify that it matches with the * received ICV */ icv[0] = crc; icv[1] = crc >> 8; icv[2] = crc >> 16; icv[3] = crc >> 24; for (k = 0; k < 4; k++) { i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); if ((icv[k] ^ S[(S[i] + S[j]) & 0xff]) != *pos++) { /* ICV mismatch - drop frame */ return -1; } } return 0; } static __inline u32 rotl(u32 val, int bits) { return (val << bits) | (val >> (32 - bits)); } static __inline u32 rotr(u32 val, int bits) { return (val >> bits) | (val << (32 - bits)); } static __inline u32 xswap(u32 val) { return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8); } #define michael_block(l, r) \ do { \ r ^= rotl(l, 17); \ l += r; \ r ^= xswap(l); \ l += r; \ r ^= rotl(l, 3); \ l += r; \ r ^= rotr(l, 2); \ l += r; \ } while (0) static __inline u32 get_le32_split(u8 b0, u8 b1, u8 b2, u8 b3) { return b0 | (b1 << 8) | (b2 << 16) | (b3 << 24); } static __inline u32 get_le32(const u8 *p) { return get_le32_split(p[0], p[1], p[2], p[3]); } static __inline void put_le32(u8 *p, u32 v) { p[0] = v; p[1] = v >> 8; p[2] = v >> 16; p[3] = v >> 24; } /* * Craft pseudo header used to calculate the MIC. */ static void michael_mic_hdr(const struct ieee80211_frame *wh0, uint8_t hdr[16]) { const struct ieee80211_frame_addr4 *wh = (const struct ieee80211_frame_addr4 *) wh0; switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { case IEEE80211_FC1_DIR_NODS: IEEE80211_ADDR_COPY(hdr, wh->i_addr1); /* DA */ IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr2); break; case IEEE80211_FC1_DIR_TODS: IEEE80211_ADDR_COPY(hdr, wh->i_addr3); /* DA */ IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr2); break; case IEEE80211_FC1_DIR_FROMDS: IEEE80211_ADDR_COPY(hdr, wh->i_addr1); /* DA */ IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr3); break; case IEEE80211_FC1_DIR_DSTODS: IEEE80211_ADDR_COPY(hdr, wh->i_addr3); /* DA */ IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr4); break; } if (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_QOS) { const struct ieee80211_qosframe *qwh = (const struct ieee80211_qosframe *) wh; hdr[12] = qwh->i_qos[0] & IEEE80211_QOS_TID; } else hdr[12] = 0; hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ } static void michael_mic(struct tkip_ctx *ctx, const u8 *key, struct mbuf *m, u_int off, size_t data_len, u8 mic[IEEE80211_WEP_MICLEN]) { uint8_t hdr[16]; u32 l, r; const uint8_t *data; u_int space; michael_mic_hdr(mtod(m, struct ieee80211_frame *), hdr); l = get_le32(key); r = get_le32(key + 4); /* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */ l ^= get_le32(hdr); michael_block(l, r); l ^= get_le32(&hdr[4]); michael_block(l, r); l ^= get_le32(&hdr[8]); michael_block(l, r); l ^= get_le32(&hdr[12]); michael_block(l, r); /* first buffer has special handling */ data = mtod(m, const uint8_t *) + off; space = m->m_len - off; for (;;) { if (space > data_len) space = data_len; /* collect 32-bit blocks from current buffer */ while (space >= sizeof(uint32_t)) { l ^= get_le32(data); michael_block(l, r); data += sizeof(uint32_t), space -= sizeof(uint32_t); data_len -= sizeof(uint32_t); } /* * NB: when space is zero we make one more trip around * the loop to advance to the next mbuf where there is * data. This handles the case where there are 4*n * bytes in an mbuf followed by <4 bytes in a later mbuf. * By making an extra trip we'll drop out of the loop * with m pointing at the mbuf with 3 bytes and space * set as required by the remainder handling below. */ if (data_len == 0 || (data_len < sizeof(uint32_t) && space != 0)) break; m = m->m_next; if (m == NULL) { KASSERT(0, ("out of data, data_len %zu\n", data_len)); break; } if (space != 0) { const uint8_t *data_next; /* * Block straddles buffers, split references. */ data_next = mtod(m, const uint8_t *); KASSERT(m->m_len >= sizeof(uint32_t) - space, ("not enough data in following buffer, " "m_len %u need %zu\n", m->m_len, sizeof(uint32_t) - space)); switch (space) { case 1: l ^= get_le32_split(data[0], data_next[0], data_next[1], data_next[2]); data = data_next + 3; space = m->m_len - 3; break; case 2: l ^= get_le32_split(data[0], data[1], data_next[0], data_next[1]); data = data_next + 2; space = m->m_len - 2; break; case 3: l ^= get_le32_split(data[0], data[1], data[2], data_next[0]); data = data_next + 1; space = m->m_len - 1; break; } michael_block(l, r); data_len -= sizeof(uint32_t); } else { /* * Setup for next buffer. */ data = mtod(m, const uint8_t *); space = m->m_len; } } /* * Catch degenerate cases like mbuf[4*n+1 bytes] followed by * mbuf[2 bytes]. I don't believe these should happen; if they * do then we'll need more involved logic. */ KASSERT(data_len <= space, ("not enough data, data_len %zu space %u\n", data_len, space)); /* Last block and padding (0x5a, 4..7 x 0) */ switch (data_len) { case 0: l ^= get_le32_split(0x5a, 0, 0, 0); break; case 1: l ^= get_le32_split(data[0], 0x5a, 0, 0); break; case 2: l ^= get_le32_split(data[0], data[1], 0x5a, 0); break; case 3: l ^= get_le32_split(data[0], data[1], data[2], 0x5a); break; } michael_block(l, r); /* l ^= 0; */ michael_block(l, r); put_le32(mic, l); put_le32(mic + 4, r); } static int tkip_encrypt(struct tkip_ctx *ctx, struct ieee80211_key *key, struct mbuf *m, int hdrlen) { struct ieee80211_frame *wh; uint8_t icv[IEEE80211_WEP_CRCLEN]; ctx->tc_vap->iv_stats.is_crypto_tkip++; wh = mtod(m, struct ieee80211_frame *); if (!ctx->tx_phase1_done) { tkip_mixing_phase1(ctx->tx_ttak, key->wk_key, wh->i_addr2, (u32)(key->wk_keytsc >> 16)); ctx->tx_phase1_done = 1; } tkip_mixing_phase2(ctx->tx_rc4key, key->wk_key, ctx->tx_ttak, (u16) key->wk_keytsc); wep_encrypt(ctx->tx_rc4key, m, hdrlen + tkip.ic_header, m->m_pkthdr.len - (hdrlen + tkip.ic_header), icv); (void) m_append(m, IEEE80211_WEP_CRCLEN, icv); /* XXX check return */ key->wk_keytsc++; if ((u16)(key->wk_keytsc) == 0) ctx->tx_phase1_done = 0; return 1; } static int tkip_decrypt(struct tkip_ctx *ctx, struct ieee80211_key *key, struct mbuf *m, int hdrlen) { struct ieee80211_frame *wh; struct ieee80211vap *vap = ctx->tc_vap; u32 iv32; u16 iv16; u8 tid; vap->iv_stats.is_crypto_tkip++; wh = mtod(m, struct ieee80211_frame *); /* NB: tkip_decap already verified header and left seq in rx_rsc */ iv16 = (u16) ctx->rx_rsc; iv32 = (u32) (ctx->rx_rsc >> 16); tid = ieee80211_gettid(wh); if (iv32 != (u32)(key->wk_keyrsc[tid] >> 16) || !ctx->rx_phase1_done) { tkip_mixing_phase1(ctx->rx_ttak, key->wk_key, wh->i_addr2, iv32); ctx->rx_phase1_done = 1; } tkip_mixing_phase2(ctx->rx_rc4key, key->wk_key, ctx->rx_ttak, iv16); /* NB: m is unstripped; deduct headers + ICV to get payload */ if (wep_decrypt(ctx->rx_rc4key, m, hdrlen + tkip.ic_header, m->m_pkthdr.len - (hdrlen + tkip.ic_header + tkip.ic_trailer))) { if (iv32 != (u32)(key->wk_keyrsc[tid] >> 16)) { /* Previously cached Phase1 result was already lost, so * it needs to be recalculated for the next packet. */ ctx->rx_phase1_done = 0; } IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "%s", "TKIP ICV mismatch on decrypt"); vap->iv_stats.is_rx_tkipicv++; return 0; } return 1; } /* * Module glue. */ IEEE80211_CRYPTO_MODULE(tkip, 1); Index: head/sys/net80211/ieee80211_crypto_wep.c =================================================================== --- head/sys/net80211/ieee80211_crypto_wep.c (revision 288522) +++ head/sys/net80211/ieee80211_crypto_wep.c (revision 288523) @@ -1,480 +1,484 @@ /*- * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * IEEE 802.11 WEP crypto support. */ #include "opt_wlan.h" #include #include #include #include #include #include #include #include #include #include #include #include static void *wep_attach(struct ieee80211vap *, struct ieee80211_key *); static void wep_detach(struct ieee80211_key *); static int wep_setkey(struct ieee80211_key *); -static int wep_encap(struct ieee80211_key *, struct mbuf *, uint8_t keyid); +static int wep_encap(struct ieee80211_key *, struct mbuf *); static int wep_decap(struct ieee80211_key *, struct mbuf *, int hdrlen); static int wep_enmic(struct ieee80211_key *, struct mbuf *, int); static int wep_demic(struct ieee80211_key *, struct mbuf *, int); static const struct ieee80211_cipher wep = { .ic_name = "WEP", .ic_cipher = IEEE80211_CIPHER_WEP, .ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN, .ic_trailer = IEEE80211_WEP_CRCLEN, .ic_miclen = 0, .ic_attach = wep_attach, .ic_detach = wep_detach, .ic_setkey = wep_setkey, .ic_encap = wep_encap, .ic_decap = wep_decap, .ic_enmic = wep_enmic, .ic_demic = wep_demic, }; static int wep_encrypt(struct ieee80211_key *, struct mbuf *, int hdrlen); static int wep_decrypt(struct ieee80211_key *, struct mbuf *, int hdrlen); struct wep_ctx { struct ieee80211vap *wc_vap; /* for diagnostics+statistics */ struct ieee80211com *wc_ic; uint32_t wc_iv; /* initial vector for crypto */ }; /* number of references from net80211 layer */ static int nrefs = 0; static void * wep_attach(struct ieee80211vap *vap, struct ieee80211_key *k) { struct wep_ctx *ctx; ctx = (struct wep_ctx *) IEEE80211_MALLOC(sizeof(struct wep_ctx), M_80211_CRYPTO, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); if (ctx == NULL) { vap->iv_stats.is_crypto_nomem++; return NULL; } ctx->wc_vap = vap; ctx->wc_ic = vap->iv_ic; get_random_bytes(&ctx->wc_iv, sizeof(ctx->wc_iv)); nrefs++; /* NB: we assume caller locking */ return ctx; } static void wep_detach(struct ieee80211_key *k) { struct wep_ctx *ctx = k->wk_private; IEEE80211_FREE(ctx, M_80211_CRYPTO); KASSERT(nrefs > 0, ("imbalanced attach/detach")); nrefs--; /* NB: we assume caller locking */ } static int wep_setkey(struct ieee80211_key *k) { return k->wk_keylen >= 40/NBBY; } /* * Add privacy headers appropriate for the specified key. */ static int -wep_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) +wep_encap(struct ieee80211_key *k, struct mbuf *m) { struct wep_ctx *ctx = k->wk_private; + struct ieee80211vap *vap = ctx->wc_vap; struct ieee80211com *ic = ctx->wc_ic; uint32_t iv; uint8_t *ivp; + uint8_t keyid; int hdrlen; hdrlen = ieee80211_hdrspace(ic, mtod(m, void *)); /* * Copy down 802.11 header and add the IV + KeyID. */ M_PREPEND(m, wep.ic_header, M_NOWAIT); if (m == NULL) return 0; ivp = mtod(m, uint8_t *); ovbcopy(ivp + wep.ic_header, ivp, hdrlen); ivp += hdrlen; + + keyid = ieee80211_crypto_get_keyid(vap, k) << 6; /* * XXX * IV must not duplicate during the lifetime of the key. * But no mechanism to renew keys is defined in IEEE 802.11 * for WEP. And the IV may be duplicated at other stations * because the session key itself is shared. So we use a * pseudo random IV for now, though it is not the right way. * * NB: Rather than use a strictly random IV we select a * random one to start and then increment the value for * each frame. This is an explicit tradeoff between * overhead and security. Given the basic insecurity of * WEP this seems worthwhile. */ /* * Skip 'bad' IVs from Fluhrer/Mantin/Shamir: * (B, 255, N) with 3 <= B < 16 and 0 <= N <= 255 */ iv = ctx->wc_iv; if ((iv & 0xff00) == 0xff00) { int B = (iv & 0xff0000) >> 16; if (3 <= B && B < 16) iv += 0x0100; } ctx->wc_iv = iv + 1; /* * NB: Preserve byte order of IV for packet * sniffers; it doesn't matter otherwise. */ #if _BYTE_ORDER == _BIG_ENDIAN ivp[0] = iv >> 0; ivp[1] = iv >> 8; ivp[2] = iv >> 16; #else ivp[2] = iv >> 0; ivp[1] = iv >> 8; ivp[0] = iv >> 16; #endif ivp[3] = keyid; /* * Finally, do software encrypt if needed. */ if ((k->wk_flags & IEEE80211_KEY_SWENCRYPT) && !wep_encrypt(k, m, hdrlen)) return 0; return 1; } /* * Add MIC to the frame as needed. */ static int wep_enmic(struct ieee80211_key *k, struct mbuf *m, int force) { return 1; } /* * Validate and strip privacy headers (and trailer) for a * received frame. If necessary, decrypt the frame using * the specified key. */ static int wep_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) { struct wep_ctx *ctx = k->wk_private; struct ieee80211vap *vap = ctx->wc_vap; struct ieee80211_frame *wh; wh = mtod(m, struct ieee80211_frame *); /* * Check if the device handled the decrypt in hardware. * If so we just strip the header; otherwise we need to * handle the decrypt in software. */ if ((k->wk_flags & IEEE80211_KEY_SWDECRYPT) && !wep_decrypt(k, m, hdrlen)) { IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, "%s", "WEP ICV mismatch on decrypt"); vap->iv_stats.is_rx_wepfail++; return 0; } /* * Copy up 802.11 header and strip crypto bits. */ ovbcopy(mtod(m, void *), mtod(m, uint8_t *) + wep.ic_header, hdrlen); m_adj(m, wep.ic_header); m_adj(m, -wep.ic_trailer); return 1; } /* * Verify and strip MIC from the frame. */ static int wep_demic(struct ieee80211_key *k, struct mbuf *skb, int force) { return 1; } static const uint32_t crc32_table[256] = { 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL }; static int wep_encrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen) { #define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0) struct wep_ctx *ctx = key->wk_private; struct ieee80211vap *vap = ctx->wc_vap; struct mbuf *m = m0; uint8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE]; uint8_t icv[IEEE80211_WEP_CRCLEN]; uint32_t i, j, k, crc; size_t buflen, data_len; uint8_t S[256]; uint8_t *pos; u_int off, keylen; vap->iv_stats.is_crypto_wep++; /* NB: this assumes the header was pulled up */ memcpy(rc4key, mtod(m, uint8_t *) + hdrlen, IEEE80211_WEP_IVLEN); memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen); /* Setup RC4 state */ for (i = 0; i < 256; i++) S[i] = i; j = 0; keylen = key->wk_keylen + IEEE80211_WEP_IVLEN; for (i = 0; i < 256; i++) { j = (j + S[i] + rc4key[i % keylen]) & 0xff; S_SWAP(i, j); } off = hdrlen + wep.ic_header; data_len = m->m_pkthdr.len - off; /* Compute CRC32 over unencrypted data and apply RC4 to data */ crc = ~0; i = j = 0; pos = mtod(m, uint8_t *) + off; buflen = m->m_len - off; for (;;) { if (buflen > data_len) buflen = data_len; data_len -= buflen; for (k = 0; k < buflen; k++) { crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); *pos++ ^= S[(S[i] + S[j]) & 0xff]; } if (m->m_next == NULL) { if (data_len != 0) { /* out of data */ IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, ether_sprintf(mtod(m0, struct ieee80211_frame *)->i_addr2), "out of data for WEP (data_len %zu)", data_len); /* XXX stat */ return 0; } break; } m = m->m_next; pos = mtod(m, uint8_t *); buflen = m->m_len; } crc = ~crc; /* Append little-endian CRC32 and encrypt it to produce ICV */ icv[0] = crc; icv[1] = crc >> 8; icv[2] = crc >> 16; icv[3] = crc >> 24; for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) { i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); icv[k] ^= S[(S[i] + S[j]) & 0xff]; } return m_append(m0, IEEE80211_WEP_CRCLEN, icv); #undef S_SWAP } static int wep_decrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen) { #define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0) struct wep_ctx *ctx = key->wk_private; struct ieee80211vap *vap = ctx->wc_vap; struct mbuf *m = m0; uint8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE]; uint8_t icv[IEEE80211_WEP_CRCLEN]; uint32_t i, j, k, crc; size_t buflen, data_len; uint8_t S[256]; uint8_t *pos; u_int off, keylen; vap->iv_stats.is_crypto_wep++; /* NB: this assumes the header was pulled up */ memcpy(rc4key, mtod(m, uint8_t *) + hdrlen, IEEE80211_WEP_IVLEN); memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen); /* Setup RC4 state */ for (i = 0; i < 256; i++) S[i] = i; j = 0; keylen = key->wk_keylen + IEEE80211_WEP_IVLEN; for (i = 0; i < 256; i++) { j = (j + S[i] + rc4key[i % keylen]) & 0xff; S_SWAP(i, j); } off = hdrlen + wep.ic_header; data_len = m->m_pkthdr.len - (off + wep.ic_trailer), /* Compute CRC32 over unencrypted data and apply RC4 to data */ crc = ~0; i = j = 0; pos = mtod(m, uint8_t *) + off; buflen = m->m_len - off; for (;;) { if (buflen > data_len) buflen = data_len; data_len -= buflen; for (k = 0; k < buflen; k++) { i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); *pos ^= S[(S[i] + S[j]) & 0xff]; crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); pos++; } m = m->m_next; if (m == NULL) { if (data_len != 0) { /* out of data */ IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, mtod(m0, struct ieee80211_frame *)->i_addr2, "out of data for WEP (data_len %zu)", data_len); return 0; } break; } pos = mtod(m, uint8_t *); buflen = m->m_len; } crc = ~crc; /* Encrypt little-endian CRC32 and verify that it matches with * received ICV */ icv[0] = crc; icv[1] = crc >> 8; icv[2] = crc >> 16; icv[3] = crc >> 24; for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) { i = (i + 1) & 0xff; j = (j + S[i]) & 0xff; S_SWAP(i, j); /* XXX assumes ICV is contiguous in mbuf */ if ((icv[k] ^ S[(S[i] + S[j]) & 0xff]) != *pos++) { /* ICV mismatch - drop frame */ return 0; } } return 1; #undef S_SWAP } /* * Module glue. */ IEEE80211_CRYPTO_MODULE(wep, 1);