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hostap/src/rsn_supp/wpa.c
Jouni Malinen 852b2f2738 SAE: Only allow SAE AKMP for PMKSA caching attempts 
Explicitly check the PMKSA cache entry to have matching SAE AKMP for the
case where determining whether to use PMKSA caching instead of new SAE
authentication. Previously, only the network context was checked, but a
single network configuration profile could be used with both WPA2-PSK
and SAE, so should check the AKMP as well.

Signed-off-by: Jouni Malinen <j@w1.fi>
2018-04-09 19:34:44 +03:00

4400 lines
121 KiB
C
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/*
* WPA Supplicant - WPA state machine and EAPOL-Key processing
* Copyright (c) 2003-2017, Jouni Malinen <j@w1.fi>
* Copyright(c) 2015 Intel Deutschland GmbH
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/aes.h"
#include "crypto/aes_wrap.h"
#include "crypto/crypto.h"
#include "crypto/random.h"
#include "crypto/aes_siv.h"
#include "crypto/sha256.h"
#include "crypto/sha384.h"
#include "crypto/sha512.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "eap_common/eap_defs.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "wpa.h"
#include "eloop.h"
#include "preauth.h"
#include "pmksa_cache.h"
#include "wpa_i.h"
#include "wpa_ie.h"
static const u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
/**
* wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @ptk: PTK for Key Confirmation/Encryption Key
* @ver: Version field from Key Info
* @dest: Destination address for the frame
* @proto: Ethertype (usually ETH_P_EAPOL)
* @msg: EAPOL-Key message
* @msg_len: Length of message
* @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written
* Returns: >= 0 on success, < 0 on failure
*/
int wpa_eapol_key_send(struct wpa_sm *sm, struct wpa_ptk *ptk,
int ver, const u8 *dest, u16 proto,
u8 *msg, size_t msg_len, u8 *key_mic)
{
int ret = -1;
size_t mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
wpa_printf(MSG_DEBUG, "WPA: Send EAPOL-Key frame to " MACSTR
" ver=%d mic_len=%d key_mgmt=0x%x",
MAC2STR(dest), ver, (int) mic_len, sm->key_mgmt);
if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) {
/*
* Association event was not yet received; try to fetch
* BSSID from the driver.
*/
if (wpa_sm_get_bssid(sm, sm->bssid) < 0) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Failed to read BSSID for "
"EAPOL-Key destination address");
} else {
dest = sm->bssid;
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Use BSSID (" MACSTR
") as the destination for EAPOL-Key",
MAC2STR(dest));
}
}
if (mic_len) {
if (key_mic && (!ptk || !ptk->kck_len))
goto out;
if (key_mic &&
wpa_eapol_key_mic(ptk->kck, ptk->kck_len, sm->key_mgmt, ver,
msg, msg_len, key_mic)) {
wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
"WPA: Failed to generate EAPOL-Key version %d key_mgmt 0x%x MIC",
ver, sm->key_mgmt);
goto out;
}
if (ptk)
wpa_hexdump_key(MSG_DEBUG, "WPA: KCK",
ptk->kck, ptk->kck_len);
wpa_hexdump(MSG_DEBUG, "WPA: Derived Key MIC",
key_mic, mic_len);
} else {
#ifdef CONFIG_FILS
/* AEAD cipher - Key MIC field not used */
struct ieee802_1x_hdr *s_hdr, *hdr;
struct wpa_eapol_key *s_key, *key;
u8 *buf, *s_key_data, *key_data;
size_t buf_len = msg_len + AES_BLOCK_SIZE;
size_t key_data_len;
u16 eapol_len;
const u8 *aad[1];
size_t aad_len[1];
if (!ptk || !ptk->kek_len)
goto out;
key_data_len = msg_len - sizeof(struct ieee802_1x_hdr) -
sizeof(struct wpa_eapol_key) - 2;
buf = os_malloc(buf_len);
if (!buf)
goto out;
os_memcpy(buf, msg, msg_len);
hdr = (struct ieee802_1x_hdr *) buf;
key = (struct wpa_eapol_key *) (hdr + 1);
key_data = ((u8 *) (key + 1)) + 2;
/* Update EAPOL header to include AES-SIV overhead */
eapol_len = be_to_host16(hdr->length);
eapol_len += AES_BLOCK_SIZE;
hdr->length = host_to_be16(eapol_len);
/* Update Key Data Length field to include AES-SIV overhead */
WPA_PUT_BE16((u8 *) (key + 1), AES_BLOCK_SIZE + key_data_len);
s_hdr = (struct ieee802_1x_hdr *) msg;
s_key = (struct wpa_eapol_key *) (s_hdr + 1);
s_key_data = ((u8 *) (s_key + 1)) + 2;
wpa_hexdump_key(MSG_DEBUG, "WPA: Plaintext Key Data",
s_key_data, key_data_len);
wpa_hexdump_key(MSG_DEBUG, "WPA: KEK", ptk->kek, ptk->kek_len);
/* AES-SIV AAD from EAPOL protocol version field (inclusive) to
* to Key Data (exclusive). */
aad[0] = buf;
aad_len[0] = key_data - buf;
if (aes_siv_encrypt(ptk->kek, ptk->kek_len,
s_key_data, key_data_len,
1, aad, aad_len, key_data) < 0) {
os_free(buf);
goto out;
}
wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
key_data, AES_BLOCK_SIZE + key_data_len);
os_free(msg);
msg = buf;
msg_len = buf_len;
#else /* CONFIG_FILS */
goto out;
#endif /* CONFIG_FILS */
}
wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len);
ret = wpa_sm_ether_send(sm, dest, proto, msg, msg_len);
eapol_sm_notify_tx_eapol_key(sm->eapol);
out:
os_free(msg);
return ret;
}
/**
* wpa_sm_key_request - Send EAPOL-Key Request
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @error: Indicate whether this is an Michael MIC error report
* @pairwise: 1 = error report for pairwise packet, 0 = for group packet
*
* Send an EAPOL-Key Request to the current authenticator. This function is
* used to request rekeying and it is usually called when a local Michael MIC
* failure is detected.
*/
void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
int key_info, ver;
u8 bssid[ETH_ALEN], *rbuf, *key_mic, *mic;
if (wpa_use_akm_defined(sm->key_mgmt))
ver = WPA_KEY_INFO_TYPE_AKM_DEFINED;
else if (wpa_key_mgmt_ft(sm->key_mgmt) ||
wpa_key_mgmt_sha256(sm->key_mgmt))
ver = WPA_KEY_INFO_TYPE_AES_128_CMAC;
else if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
else
ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
if (wpa_sm_get_bssid(sm, bssid) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"Failed to read BSSID for EAPOL-Key request");
return;
}
mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
hdrlen, &rlen, (void *) &reply);
if (rbuf == NULL)
return;
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
key_info = WPA_KEY_INFO_REQUEST | ver;
if (sm->ptk_set)
key_info |= WPA_KEY_INFO_SECURE;
if (sm->ptk_set && mic_len)
key_info |= WPA_KEY_INFO_MIC;
if (error)
key_info |= WPA_KEY_INFO_ERROR;
if (pairwise)
key_info |= WPA_KEY_INFO_KEY_TYPE;
WPA_PUT_BE16(reply->key_info, key_info);
WPA_PUT_BE16(reply->key_length, 0);
os_memcpy(reply->replay_counter, sm->request_counter,
WPA_REPLAY_COUNTER_LEN);
inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
mic = (u8 *) (reply + 1);
WPA_PUT_BE16(mic + mic_len, 0);
if (!(key_info & WPA_KEY_INFO_MIC))
key_mic = NULL;
else
key_mic = mic;
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Sending EAPOL-Key Request (error=%d "
"pairwise=%d ptk_set=%d len=%lu)",
error, pairwise, sm->ptk_set, (unsigned long) rlen);
wpa_eapol_key_send(sm, &sm->ptk, ver, bssid, ETH_P_EAPOL, rbuf, rlen,
key_mic);
}
static void wpa_supplicant_key_mgmt_set_pmk(struct wpa_sm *sm)
{
#ifdef CONFIG_IEEE80211R
if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
if (wpa_sm_key_mgmt_set_pmk(sm, sm->xxkey, sm->xxkey_len))
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: Cannot set low order 256 bits of MSK for key management offload");
} else {
#endif /* CONFIG_IEEE80211R */
if (wpa_sm_key_mgmt_set_pmk(sm, sm->pmk, sm->pmk_len))
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: Cannot set PMK for key management offload");
#ifdef CONFIG_IEEE80211R
}
#endif /* CONFIG_IEEE80211R */
}
static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
const unsigned char *src_addr,
const u8 *pmkid)
{
int abort_cached = 0;
if (pmkid && !sm->cur_pmksa) {
/* When using drivers that generate RSN IE, wpa_supplicant may
* not have enough time to get the association information
* event before receiving this 1/4 message, so try to find a
* matching PMKSA cache entry here. */
sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid,
NULL, 0);
if (sm->cur_pmksa) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: found matching PMKID from PMKSA cache");
} else {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: no matching PMKID found");
abort_cached = 1;
}
}
if (pmkid && sm->cur_pmksa &&
os_memcmp_const(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) {
wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN);
wpa_sm_set_pmk_from_pmksa(sm);
wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache",
sm->pmk, sm->pmk_len);
eapol_sm_notify_cached(sm->eapol);
#ifdef CONFIG_IEEE80211R
sm->xxkey_len = 0;
#ifdef CONFIG_SAE
if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE &&
sm->pmk_len == PMK_LEN) {
/* Need to allow FT key derivation to proceed with
* PMK from SAE being used as the XXKey in cases where
* the PMKID in msg 1/4 matches the PMKSA entry that was
* just added based on SAE authentication for the
* initial mobility domain association. */
os_memcpy(sm->xxkey, sm->pmk, sm->pmk_len);
sm->xxkey_len = sm->pmk_len;
}
#endif /* CONFIG_SAE */
#endif /* CONFIG_IEEE80211R */
} else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
int res, pmk_len;
if (wpa_key_mgmt_sha384(sm->key_mgmt))
pmk_len = PMK_LEN_SUITE_B_192;
else
pmk_len = PMK_LEN;
res = eapol_sm_get_key(sm->eapol, sm->pmk, pmk_len);
if (res) {
if (pmk_len == PMK_LEN) {
/*
* EAP-LEAP is an exception from other EAP
* methods: it uses only 16-byte PMK.
*/
res = eapol_sm_get_key(sm->eapol, sm->pmk, 16);
pmk_len = 16;
}
} else {
#ifdef CONFIG_IEEE80211R
u8 buf[2 * PMK_LEN];
if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0)
{
os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN);
sm->xxkey_len = PMK_LEN;
os_memset(buf, 0, sizeof(buf));
}
#endif /* CONFIG_IEEE80211R */
}
if (res == 0) {
struct rsn_pmksa_cache_entry *sa = NULL;
const u8 *fils_cache_id = NULL;
#ifdef CONFIG_FILS
if (sm->fils_cache_id_set)
fils_cache_id = sm->fils_cache_id;
#endif /* CONFIG_FILS */
wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
"machines", sm->pmk, pmk_len);
sm->pmk_len = pmk_len;
wpa_supplicant_key_mgmt_set_pmk(sm);
if (sm->proto == WPA_PROTO_RSN &&
!wpa_key_mgmt_suite_b(sm->key_mgmt) &&
!wpa_key_mgmt_ft(sm->key_mgmt)) {
sa = pmksa_cache_add(sm->pmksa,
sm->pmk, pmk_len, NULL,
NULL, 0,
src_addr, sm->own_addr,
sm->network_ctx,
sm->key_mgmt,
fils_cache_id);
}
if (!sm->cur_pmksa && pmkid &&
pmksa_cache_get(sm->pmksa, src_addr, pmkid, NULL,
0)) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: the new PMK matches with the "
"PMKID");
abort_cached = 0;
} else if (sa && !sm->cur_pmksa && pmkid) {
/*
* It looks like the authentication server
* derived mismatching MSK. This should not
* really happen, but bugs happen.. There is not
* much we can do here without knowing what
* exactly caused the server to misbehave.
*/
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: PMKID mismatch - authentication server may have derived different MSK?!");
return -1;
}
if (!sm->cur_pmksa)
sm->cur_pmksa = sa;
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Failed to get master session key from "
"EAPOL state machines - key handshake "
"aborted");
if (sm->cur_pmksa) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: Cancelled PMKSA caching "
"attempt");
sm->cur_pmksa = NULL;
abort_cached = 1;
} else if (!abort_cached) {
return -1;
}
}
}
if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) &&
!wpa_key_mgmt_suite_b(sm->key_mgmt) &&
!wpa_key_mgmt_ft(sm->key_mgmt) && sm->key_mgmt != WPA_KEY_MGMT_OSEN)
{
/* Send EAPOL-Start to trigger full EAP authentication. */
u8 *buf;
size_t buflen;
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: no PMKSA entry found - trigger "
"full EAP authentication");
buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START,
NULL, 0, &buflen, NULL);
if (buf) {
wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL,
buf, buflen);
os_free(buf);
return -2;
}
return -1;
}
return 0;
}
/**
* wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @dst: Destination address for the frame
* @key: Pointer to the EAPOL-Key frame header
* @ver: Version bits from EAPOL-Key Key Info
* @nonce: Nonce value for the EAPOL-Key frame
* @wpa_ie: WPA/RSN IE
* @wpa_ie_len: Length of the WPA/RSN IE
* @ptk: PTK to use for keyed hash and encryption
* Returns: >= 0 on success, < 0 on failure
*/
int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
const struct wpa_eapol_key *key,
int ver, const u8 *nonce,
const u8 *wpa_ie, size_t wpa_ie_len,
struct wpa_ptk *ptk)
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
u8 *rbuf, *key_mic;
u8 *rsn_ie_buf = NULL;
u16 key_info;
if (wpa_ie == NULL) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No wpa_ie set - "
"cannot generate msg 2/4");
return -1;
}
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt)) {
int res;
/*
* Add PMKR1Name into RSN IE (PMKID-List) and add MDIE and
* FTIE from (Re)Association Response.
*/
rsn_ie_buf = os_malloc(wpa_ie_len + 2 + 2 + PMKID_LEN +
sm->assoc_resp_ies_len);
if (rsn_ie_buf == NULL)
return -1;
os_memcpy(rsn_ie_buf, wpa_ie, wpa_ie_len);
res = wpa_insert_pmkid(rsn_ie_buf, &wpa_ie_len,
sm->pmk_r1_name);
if (res < 0) {
os_free(rsn_ie_buf);
return -1;
}
if (sm->assoc_resp_ies) {
os_memcpy(rsn_ie_buf + wpa_ie_len, sm->assoc_resp_ies,
sm->assoc_resp_ies_len);
wpa_ie_len += sm->assoc_resp_ies_len;
}
wpa_ie = rsn_ie_buf;
}
#endif /* CONFIG_IEEE80211R */
wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
NULL, hdrlen + wpa_ie_len,
&rlen, (void *) &reply);
if (rbuf == NULL) {
os_free(rsn_ie_buf);
return -1;
}
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
key_info = ver | WPA_KEY_INFO_KEY_TYPE;
if (mic_len)
key_info |= WPA_KEY_INFO_MIC;
else
key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
WPA_PUT_BE16(reply->key_info, key_info);
if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
WPA_PUT_BE16(reply->key_length, 0);
else
os_memcpy(reply->key_length, key->key_length, 2);
os_memcpy(reply->replay_counter, key->replay_counter,
WPA_REPLAY_COUNTER_LEN);
wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", reply->replay_counter,
WPA_REPLAY_COUNTER_LEN);
key_mic = (u8 *) (reply + 1);
WPA_PUT_BE16(key_mic + mic_len, wpa_ie_len); /* Key Data Length */
os_memcpy(key_mic + mic_len + 2, wpa_ie, wpa_ie_len); /* Key Data */
os_free(rsn_ie_buf);
os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4");
return wpa_eapol_key_send(sm, ptk, ver, dst, ETH_P_EAPOL, rbuf, rlen,
key_mic);
}
static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
{
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt))
return wpa_derive_ptk_ft(sm, src_addr, key, ptk);
#endif /* CONFIG_IEEE80211R */
return wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
sm->own_addr, sm->bssid, sm->snonce,
key->key_nonce, ptk, sm->key_mgmt,
sm->pairwise_cipher);
}
static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
const unsigned char *src_addr,
const struct wpa_eapol_key *key,
u16 ver, const u8 *key_data,
size_t key_data_len)
{
struct wpa_eapol_ie_parse ie;
struct wpa_ptk *ptk;
int res;
u8 *kde, *kde_buf = NULL;
size_t kde_len;
if (wpa_sm_get_network_ctx(sm) == NULL) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No SSID info "
"found (msg 1 of 4)");
return;
}
wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of 4-Way "
"Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
os_memset(&ie, 0, sizeof(ie));
if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
/* RSN: msg 1/4 should contain PMKID for the selected PMK */
wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data",
key_data, key_data_len);
if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
goto failed;
if (ie.pmkid) {
wpa_hexdump(MSG_DEBUG, "RSN: PMKID from "
"Authenticator", ie.pmkid, PMKID_LEN);
}
}
res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid);
if (res == -2) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Do not reply to "
"msg 1/4 - requesting full EAP authentication");
return;
}
if (res)
goto failed;
if (sm->renew_snonce) {
if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Failed to get random data for SNonce");
goto failed;
}
sm->renew_snonce = 0;
wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce",
sm->snonce, WPA_NONCE_LEN);
}
/* Calculate PTK which will be stored as a temporary PTK until it has
* been verified when processing message 3/4. */
ptk = &sm->tptk;
if (wpa_derive_ptk(sm, src_addr, key, ptk) < 0)
goto failed;
if (sm->pairwise_cipher == WPA_CIPHER_TKIP) {
u8 buf[8];
/* Supplicant: swap tx/rx Mic keys */
os_memcpy(buf, &ptk->tk[16], 8);
os_memcpy(&ptk->tk[16], &ptk->tk[24], 8);
os_memcpy(&ptk->tk[24], buf, 8);
os_memset(buf, 0, sizeof(buf));
}
sm->tptk_set = 1;
kde = sm->assoc_wpa_ie;
kde_len = sm->assoc_wpa_ie_len;
#ifdef CONFIG_P2P
if (sm->p2p) {
kde_buf = os_malloc(kde_len + 2 + RSN_SELECTOR_LEN + 1);
if (kde_buf) {
u8 *pos;
wpa_printf(MSG_DEBUG, "P2P: Add IP Address Request KDE "
"into EAPOL-Key 2/4");
os_memcpy(kde_buf, kde, kde_len);
kde = kde_buf;
pos = kde + kde_len;
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = RSN_SELECTOR_LEN + 1;
RSN_SELECTOR_PUT(pos, WFA_KEY_DATA_IP_ADDR_REQ);
pos += RSN_SELECTOR_LEN;
*pos++ = 0x01;
kde_len = pos - kde;
}
}
#endif /* CONFIG_P2P */
if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce,
kde, kde_len, ptk) < 0)
goto failed;
os_free(kde_buf);
os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN);
return;
failed:
os_free(kde_buf);
wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
}
static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_sm *sm = eloop_ctx;
rsn_preauth_candidate_process(sm);
}
static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm,
const u8 *addr, int secure)
{
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Key negotiation completed with "
MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr),
wpa_cipher_txt(sm->pairwise_cipher),
wpa_cipher_txt(sm->group_cipher));
wpa_sm_cancel_auth_timeout(sm);
wpa_sm_set_state(sm, WPA_COMPLETED);
if (secure) {
wpa_sm_mlme_setprotection(
sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX,
MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
eapol_sm_notify_portValid(sm->eapol, TRUE);
if (wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
sm->key_mgmt == WPA_KEY_MGMT_DPP ||
sm->key_mgmt == WPA_KEY_MGMT_OWE)
eapol_sm_notify_eap_success(sm->eapol, TRUE);
/*
* Start preauthentication after a short wait to avoid a
* possible race condition between the data receive and key
* configuration after the 4-Way Handshake. This increases the
* likelihood of the first preauth EAPOL-Start frame getting to
* the target AP.
*/
eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL);
}
if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: Authenticator accepted "
"opportunistic PMKSA entry - marking it valid");
sm->cur_pmksa->opportunistic = 0;
}
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt)) {
/* Prepare for the next transition */
wpa_ft_prepare_auth_request(sm, NULL);
}
#endif /* CONFIG_IEEE80211R */
}
static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_sm *sm = eloop_ctx;
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Request PTK rekeying");
wpa_sm_key_request(sm, 0, 1);
}
static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
const struct wpa_eapol_key *key)
{
int keylen, rsclen;
enum wpa_alg alg;
const u8 *key_rsc;
if (sm->ptk.installed) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Do not re-install same PTK to the driver");
return 0;
}
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Installing PTK to the driver");
if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Pairwise Cipher "
"Suite: NONE - do not use pairwise keys");
return 0;
}
if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported pairwise cipher %d",
sm->pairwise_cipher);
return -1;
}
alg = wpa_cipher_to_alg(sm->pairwise_cipher);
keylen = wpa_cipher_key_len(sm->pairwise_cipher);
if (keylen <= 0 || (unsigned int) keylen != sm->ptk.tk_len) {
wpa_printf(MSG_DEBUG, "WPA: TK length mismatch: %d != %lu",
keylen, (long unsigned int) sm->ptk.tk_len);
return -1;
}
rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher);
if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
key_rsc = null_rsc;
} else {
key_rsc = key->key_rsc;
wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen);
}
if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen,
sm->ptk.tk, keylen) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Failed to set PTK to the "
"driver (alg=%d keylen=%d bssid=" MACSTR ")",
alg, keylen, MAC2STR(sm->bssid));
return -1;
}
/* TK is not needed anymore in supplicant */
os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN);
sm->ptk.tk_len = 0;
sm->ptk.installed = 1;
if (sm->wpa_ptk_rekey) {
eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk,
sm, NULL);
}
return 0;
}
static int wpa_supplicant_check_group_cipher(struct wpa_sm *sm,
int group_cipher,
int keylen, int maxkeylen,
int *key_rsc_len,
enum wpa_alg *alg)
{
int klen;
*alg = wpa_cipher_to_alg(group_cipher);
if (*alg == WPA_ALG_NONE) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported Group Cipher %d",
group_cipher);
return -1;
}
*key_rsc_len = wpa_cipher_rsc_len(group_cipher);
klen = wpa_cipher_key_len(group_cipher);
if (keylen != klen || maxkeylen < klen) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported %s Group Cipher key length %d (%d)",
wpa_cipher_txt(group_cipher), keylen, maxkeylen);
return -1;
}
return 0;
}
struct wpa_gtk_data {
enum wpa_alg alg;
int tx, key_rsc_len, keyidx;
u8 gtk[32];
int gtk_len;
};
static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
const struct wpa_gtk_data *gd,
const u8 *key_rsc, int wnm_sleep)
{
const u8 *_gtk = gd->gtk;
u8 gtk_buf[32];
/* Detect possible key reinstallation */
if ((sm->gtk.gtk_len == (size_t) gd->gtk_len &&
os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) ||
(sm->gtk_wnm_sleep.gtk_len == (size_t) gd->gtk_len &&
os_memcmp(sm->gtk_wnm_sleep.gtk, gd->gtk,
sm->gtk_wnm_sleep.gtk_len) == 0)) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Not reinstalling already in-use GTK to the driver (keyidx=%d tx=%d len=%d)",
gd->keyidx, gd->tx, gd->gtk_len);
return 0;
}
wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)",
gd->keyidx, gd->tx, gd->gtk_len);
wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len);
if (sm->group_cipher == WPA_CIPHER_TKIP) {
/* Swap Tx/Rx keys for Michael MIC */
os_memcpy(gtk_buf, gd->gtk, 16);
os_memcpy(gtk_buf + 16, gd->gtk + 24, 8);
os_memcpy(gtk_buf + 24, gd->gtk + 16, 8);
_gtk = gtk_buf;
}
if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
if (wpa_sm_set_key(sm, gd->alg, NULL,
gd->keyidx, 1, key_rsc, gd->key_rsc_len,
_gtk, gd->gtk_len) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Failed to set GTK to the driver "
"(Group only)");
os_memset(gtk_buf, 0, sizeof(gtk_buf));
return -1;
}
} else if (wpa_sm_set_key(sm, gd->alg, broadcast_ether_addr,
gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len,
_gtk, gd->gtk_len) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Failed to set GTK to "
"the driver (alg=%d keylen=%d keyidx=%d)",
gd->alg, gd->gtk_len, gd->keyidx);
os_memset(gtk_buf, 0, sizeof(gtk_buf));
return -1;
}
os_memset(gtk_buf, 0, sizeof(gtk_buf));
if (wnm_sleep) {
sm->gtk_wnm_sleep.gtk_len = gd->gtk_len;
os_memcpy(sm->gtk_wnm_sleep.gtk, gd->gtk,
sm->gtk_wnm_sleep.gtk_len);
} else {
sm->gtk.gtk_len = gd->gtk_len;
os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len);
}
return 0;
}
static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm,
int tx)
{
if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) {
/* Ignore Tx bit for GTK if a pairwise key is used. One AP
* seemed to set this bit (incorrectly, since Tx is only when
* doing Group Key only APs) and without this workaround, the
* data connection does not work because wpa_supplicant
* configured non-zero keyidx to be used for unicast. */
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Tx bit set for GTK, but pairwise "
"keys are used - ignore Tx bit");
return 0;
}
return tx;
}
static int wpa_supplicant_rsc_relaxation(const struct wpa_sm *sm,
const u8 *rsc)
{
int rsclen;
if (!sm->wpa_rsc_relaxation)
return 0;
rsclen = wpa_cipher_rsc_len(sm->group_cipher);
/*
* Try to detect RSC (endian) corruption issue where the AP sends
* the RSC bytes in EAPOL-Key message in the wrong order, both if
* it's actually a 6-byte field (as it should be) and if it treats
* it as an 8-byte field.
* An AP model known to have this bug is the Sapido RB-1632.
*/
if (rsclen == 6 && ((rsc[5] && !rsc[0]) || rsc[6] || rsc[7])) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"RSC %02x%02x%02x%02x%02x%02x%02x%02x is likely bogus, using 0",
rsc[0], rsc[1], rsc[2], rsc[3],
rsc[4], rsc[5], rsc[6], rsc[7]);
return 1;
}
return 0;
}
static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
const u8 *gtk, size_t gtk_len,
int key_info)
{
struct wpa_gtk_data gd;
const u8 *key_rsc;
/*
* IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
* GTK KDE format:
* KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
* Reserved [bits 0-7]
* GTK
*/
os_memset(&gd, 0, sizeof(gd));
wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
gtk, gtk_len);
if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
return -1;
gd.keyidx = gtk[0] & 0x3;
gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
!!(gtk[0] & BIT(2)));
gtk += 2;
gtk_len -= 2;
os_memcpy(gd.gtk, gtk, gtk_len);
gd.gtk_len = gtk_len;
key_rsc = key->key_rsc;
if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc))
key_rsc = null_rsc;
if (sm->group_cipher != WPA_CIPHER_GTK_NOT_USED &&
(wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
gtk_len, gtk_len,
&gd.key_rsc_len, &gd.alg) ||
wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0))) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: Failed to install GTK");
os_memset(&gd, 0, sizeof(gd));
return -1;
}
os_memset(&gd, 0, sizeof(gd));
wpa_supplicant_key_neg_complete(sm, sm->bssid,
key_info & WPA_KEY_INFO_SECURE);
return 0;
}
#ifdef CONFIG_IEEE80211W
static int wpa_supplicant_install_igtk(struct wpa_sm *sm,
const struct wpa_igtk_kde *igtk,
int wnm_sleep)
{
size_t len = wpa_cipher_key_len(sm->mgmt_group_cipher);
u16 keyidx = WPA_GET_LE16(igtk->keyid);
/* Detect possible key reinstallation */
if ((sm->igtk.igtk_len == len &&
os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) ||
(sm->igtk_wnm_sleep.igtk_len == len &&
os_memcmp(sm->igtk_wnm_sleep.igtk, igtk->igtk,
sm->igtk_wnm_sleep.igtk_len) == 0)) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Not reinstalling already in-use IGTK to the driver (keyidx=%d)",
keyidx);
return 0;
}
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: IGTK keyid %d pn %02x%02x%02x%02x%02x%02x",
keyidx, MAC2STR(igtk->pn));
wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", igtk->igtk, len);
if (keyidx > 4095) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Invalid IGTK KeyID %d", keyidx);
return -1;
}
if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
broadcast_ether_addr,
keyidx, 0, igtk->pn, sizeof(igtk->pn),
igtk->igtk, len) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Failed to configure IGTK to the driver");
return -1;
}
if (wnm_sleep) {
sm->igtk_wnm_sleep.igtk_len = len;
os_memcpy(sm->igtk_wnm_sleep.igtk, igtk->igtk,
sm->igtk_wnm_sleep.igtk_len);
} else {
sm->igtk.igtk_len = len;
os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len);
}
return 0;
}
#endif /* CONFIG_IEEE80211W */
static int ieee80211w_set_keys(struct wpa_sm *sm,
struct wpa_eapol_ie_parse *ie)
{
#ifdef CONFIG_IEEE80211W
if (!wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher))
return 0;
if (ie->igtk) {
size_t len;
const struct wpa_igtk_kde *igtk;
len = wpa_cipher_key_len(sm->mgmt_group_cipher);
if (ie->igtk_len != WPA_IGTK_KDE_PREFIX_LEN + len)
return -1;
igtk = (const struct wpa_igtk_kde *) ie->igtk;
if (wpa_supplicant_install_igtk(sm, igtk, 0) < 0)
return -1;
}
return 0;
#else /* CONFIG_IEEE80211W */
return 0;
#endif /* CONFIG_IEEE80211W */
}
static void wpa_report_ie_mismatch(struct wpa_sm *sm,
const char *reason, const u8 *src_addr,
const u8 *wpa_ie, size_t wpa_ie_len,
const u8 *rsn_ie, size_t rsn_ie_len)
{
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")",
reason, MAC2STR(src_addr));
if (sm->ap_wpa_ie) {
wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp",
sm->ap_wpa_ie, sm->ap_wpa_ie_len);
}
if (wpa_ie) {
if (!sm->ap_wpa_ie) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: No WPA IE in Beacon/ProbeResp");
}
wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg",
wpa_ie, wpa_ie_len);
}
if (sm->ap_rsn_ie) {
wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp",
sm->ap_rsn_ie, sm->ap_rsn_ie_len);
}
if (rsn_ie) {
if (!sm->ap_rsn_ie) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: No RSN IE in Beacon/ProbeResp");
}
wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg",
rsn_ie, rsn_ie_len);
}
wpa_sm_deauthenticate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS);
}
#ifdef CONFIG_IEEE80211R
static int ft_validate_mdie(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie,
const u8 *assoc_resp_mdie)
{
struct rsn_mdie *mdie;
mdie = (struct rsn_mdie *) (ie->mdie + 2);
if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
os_memcmp(mdie->mobility_domain, sm->mobility_domain,
MOBILITY_DOMAIN_ID_LEN) != 0) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE in msg 3/4 did "
"not match with the current mobility domain");
return -1;
}
if (assoc_resp_mdie &&
(assoc_resp_mdie[1] != ie->mdie[1] ||
os_memcmp(assoc_resp_mdie, ie->mdie, 2 + ie->mdie[1]) != 0)) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE mismatch");
wpa_hexdump(MSG_DEBUG, "FT: MDIE in EAPOL-Key msg 3/4",
ie->mdie, 2 + ie->mdie[1]);
wpa_hexdump(MSG_DEBUG, "FT: MDIE in (Re)Association Response",
assoc_resp_mdie, 2 + assoc_resp_mdie[1]);
return -1;
}
return 0;
}
static int ft_validate_ftie(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie,
const u8 *assoc_resp_ftie)
{
if (ie->ftie == NULL) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"FT: No FTIE in EAPOL-Key msg 3/4");
return -1;
}
if (assoc_resp_ftie == NULL)
return 0;
if (assoc_resp_ftie[1] != ie->ftie[1] ||
os_memcmp(assoc_resp_ftie, ie->ftie, 2 + ie->ftie[1]) != 0) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: FTIE mismatch");
wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 3/4",
ie->ftie, 2 + ie->ftie[1]);
wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)Association Response",
assoc_resp_ftie, 2 + assoc_resp_ftie[1]);
return -1;
}
return 0;
}
static int ft_validate_rsnie(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie)
{
struct wpa_ie_data rsn;
if (!ie->rsn_ie)
return 0;
/*
* Verify that PMKR1Name from EAPOL-Key message 3/4
* matches with the value we derived.
*/
if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 ||
rsn.num_pmkid != 1 || rsn.pmkid == NULL) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: No PMKR1Name in "
"FT 4-way handshake message 3/4");
return -1;
}
if (os_memcmp_const(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
{
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"FT: PMKR1Name mismatch in "
"FT 4-way handshake message 3/4");
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator",
rsn.pmkid, WPA_PMK_NAME_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
sm->pmk_r1_name, WPA_PMK_NAME_LEN);
return -1;
}
return 0;
}
static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie)
{
const u8 *pos, *end, *mdie = NULL, *ftie = NULL;
if (sm->assoc_resp_ies) {
pos = sm->assoc_resp_ies;
end = pos + sm->assoc_resp_ies_len;
while (end - pos > 2) {
if (2 + pos[1] > end - pos)
break;
switch (*pos) {
case WLAN_EID_MOBILITY_DOMAIN:
mdie = pos;
break;
case WLAN_EID_FAST_BSS_TRANSITION:
ftie = pos;
break;
}
pos += 2 + pos[1];
}
}
if (ft_validate_mdie(sm, src_addr, ie, mdie) < 0 ||
ft_validate_ftie(sm, src_addr, ie, ftie) < 0 ||
ft_validate_rsnie(sm, src_addr, ie) < 0)
return -1;
return 0;
}
#endif /* CONFIG_IEEE80211R */
static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
const unsigned char *src_addr,
struct wpa_eapol_ie_parse *ie)
{
if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: No WPA/RSN IE for this AP known. "
"Trying to get from scan results");
if (wpa_sm_get_beacon_ie(sm) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Could not find AP from "
"the scan results");
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Found the current AP from "
"updated scan results");
}
}
if (ie->wpa_ie == NULL && ie->rsn_ie == NULL &&
(sm->ap_wpa_ie || sm->ap_rsn_ie)) {
wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
"with IE in Beacon/ProbeResp (no IE?)",
src_addr, ie->wpa_ie, ie->wpa_ie_len,
ie->rsn_ie, ie->rsn_ie_len);
return -1;
}
if ((ie->wpa_ie && sm->ap_wpa_ie &&
(ie->wpa_ie_len != sm->ap_wpa_ie_len ||
os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) ||
(ie->rsn_ie && sm->ap_rsn_ie &&
wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt),
sm->ap_rsn_ie, sm->ap_rsn_ie_len,
ie->rsn_ie, ie->rsn_ie_len))) {
wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
"with IE in Beacon/ProbeResp",
src_addr, ie->wpa_ie, ie->wpa_ie_len,
ie->rsn_ie, ie->rsn_ie_len);
return -1;
}
if (sm->proto == WPA_PROTO_WPA &&
ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) {
wpa_report_ie_mismatch(sm, "Possible downgrade attack "
"detected - RSN was enabled and RSN IE "
"was in msg 3/4, but not in "
"Beacon/ProbeResp",
src_addr, ie->wpa_ie, ie->wpa_ie_len,
ie->rsn_ie, ie->rsn_ie_len);
return -1;
}
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt) &&
wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0)
return -1;
#endif /* CONFIG_IEEE80211R */
return 0;
}
/**
* wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @dst: Destination address for the frame
* @key: Pointer to the EAPOL-Key frame header
* @ver: Version bits from EAPOL-Key Key Info
* @key_info: Key Info
* @ptk: PTK to use for keyed hash and encryption
* Returns: >= 0 on success, < 0 on failure
*/
int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
const struct wpa_eapol_key *key,
u16 ver, u16 key_info,
struct wpa_ptk *ptk)
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
u8 *rbuf, *key_mic;
mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
hdrlen, &rlen, (void *) &reply);
if (rbuf == NULL)
return -1;
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
key_info &= WPA_KEY_INFO_SECURE;
key_info |= ver | WPA_KEY_INFO_KEY_TYPE;
if (mic_len)
key_info |= WPA_KEY_INFO_MIC;
else
key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
WPA_PUT_BE16(reply->key_info, key_info);
if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
WPA_PUT_BE16(reply->key_length, 0);
else
os_memcpy(reply->key_length, key->key_length, 2);
os_memcpy(reply->replay_counter, key->replay_counter,
WPA_REPLAY_COUNTER_LEN);
key_mic = (u8 *) (reply + 1);
WPA_PUT_BE16(key_mic + mic_len, 0);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
return wpa_eapol_key_send(sm, ptk, ver, dst, ETH_P_EAPOL, rbuf, rlen,
key_mic);
}
static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
u16 ver, const u8 *key_data,
size_t key_data_len)
{
u16 key_info, keylen;
struct wpa_eapol_ie_parse ie;
wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 3 of 4-Way "
"Handshake from " MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver);
key_info = WPA_GET_BE16(key->key_info);
wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", key_data, key_data_len);
if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
goto failed;
if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: GTK IE in unencrypted key data");
goto failed;
}
#ifdef CONFIG_IEEE80211W
if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: IGTK KDE in unencrypted key data");
goto failed;
}
if (ie.igtk &&
wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher) &&
ie.igtk_len != WPA_IGTK_KDE_PREFIX_LEN +
(unsigned int) wpa_cipher_key_len(sm->mgmt_group_cipher)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Invalid IGTK KDE length %lu",
(unsigned long) ie.igtk_len);
goto failed;
}
#endif /* CONFIG_IEEE80211W */
if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
goto failed;
if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: ANonce from message 1 of 4-Way Handshake "
"differs from 3 of 4-Way Handshake - drop packet (src="
MACSTR ")", MAC2STR(sm->bssid));
goto failed;
}
keylen = WPA_GET_BE16(key->key_length);
if (keylen != wpa_cipher_key_len(sm->pairwise_cipher)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Invalid %s key length %d (src=" MACSTR
")", wpa_cipher_txt(sm->pairwise_cipher), keylen,
MAC2STR(sm->bssid));
goto failed;
}
#ifdef CONFIG_P2P
if (ie.ip_addr_alloc) {
os_memcpy(sm->p2p_ip_addr, ie.ip_addr_alloc, 3 * 4);
wpa_hexdump(MSG_DEBUG, "P2P: IP address info",
sm->p2p_ip_addr, sizeof(sm->p2p_ip_addr));
}
#endif /* CONFIG_P2P */
if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info,
&sm->ptk) < 0) {
goto failed;
}
/* SNonce was successfully used in msg 3/4, so mark it to be renewed
* for the next 4-Way Handshake. If msg 3 is received again, the old
* SNonce will still be used to avoid changing PTK. */
sm->renew_snonce = 1;
if (key_info & WPA_KEY_INFO_INSTALL) {
if (wpa_supplicant_install_ptk(sm, key))
goto failed;
}
if (key_info & WPA_KEY_INFO_SECURE) {
wpa_sm_mlme_setprotection(
sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX,
MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
eapol_sm_notify_portValid(sm->eapol, TRUE);
}
wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
if (sm->group_cipher == WPA_CIPHER_GTK_NOT_USED) {
wpa_supplicant_key_neg_complete(sm, sm->bssid,
key_info & WPA_KEY_INFO_SECURE);
} else if (ie.gtk &&
wpa_supplicant_pairwise_gtk(sm, key,
ie.gtk, ie.gtk_len, key_info) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Failed to configure GTK");
goto failed;
}
if (ieee80211w_set_keys(sm, &ie) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Failed to configure IGTK");
goto failed;
}
if (ie.gtk)
wpa_sm_set_rekey_offload(sm);
if (sm->proto == WPA_PROTO_RSN && wpa_key_mgmt_suite_b(sm->key_mgmt)) {
struct rsn_pmksa_cache_entry *sa;
sa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, NULL,
sm->ptk.kck, sm->ptk.kck_len,
sm->bssid, sm->own_addr,
sm->network_ctx, sm->key_mgmt, NULL);
if (!sm->cur_pmksa)
sm->cur_pmksa = sa;
}
sm->msg_3_of_4_ok = 1;
return;
failed:
wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
}
static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
const u8 *keydata,
size_t keydatalen,
u16 key_info,
struct wpa_gtk_data *gd)
{
int maxkeylen;
struct wpa_eapol_ie_parse ie;
wpa_hexdump_key(MSG_DEBUG, "RSN: msg 1/2 key data",
keydata, keydatalen);
if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0)
return -1;
if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: GTK IE in unencrypted key data");
return -1;
}
if (ie.gtk == NULL) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: No GTK IE in Group Key msg 1/2");
return -1;
}
maxkeylen = gd->gtk_len = ie.gtk_len - 2;
if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
gd->gtk_len, maxkeylen,
&gd->key_rsc_len, &gd->alg))
return -1;
wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in group key handshake",
ie.gtk, ie.gtk_len);
gd->keyidx = ie.gtk[0] & 0x3;
gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
!!(ie.gtk[0] & BIT(2)));
if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Too long GTK in GTK IE (len=%lu)",
(unsigned long) ie.gtk_len - 2);
return -1;
}
os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
if (ieee80211w_set_keys(sm, &ie) < 0)
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Failed to configure IGTK");
return 0;
}
static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
const u8 *key_data,
size_t key_data_len, u16 key_info,
u16 ver, struct wpa_gtk_data *gd)
{
size_t maxkeylen;
u16 gtk_len;
gtk_len = WPA_GET_BE16(key->key_length);
maxkeylen = key_data_len;
if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
if (maxkeylen < 8) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Too short maxkeylen (%lu)",
(unsigned long) maxkeylen);
return -1;
}
maxkeylen -= 8;
}
if (gtk_len > maxkeylen ||
wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
gtk_len, maxkeylen,
&gd->key_rsc_len, &gd->alg))
return -1;
gd->gtk_len = gtk_len;
gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
WPA_KEY_INFO_KEY_INDEX_SHIFT;
if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) {
#ifdef CONFIG_NO_RC4
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: RC4 not supported in the build");
return -1;
#else /* CONFIG_NO_RC4 */
u8 ek[32];
if (key_data_len > sizeof(gd->gtk)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: RC4 key data too long (%lu)",
(unsigned long) key_data_len);
return -1;
}
os_memcpy(ek, key->key_iv, 16);
os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len);
os_memcpy(gd->gtk, key_data, key_data_len);
if (rc4_skip(ek, 32, 256, gd->gtk, key_data_len)) {
os_memset(ek, 0, sizeof(ek));
wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
"WPA: RC4 failed");
return -1;
}
os_memset(ek, 0, sizeof(ek));
#endif /* CONFIG_NO_RC4 */
} else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
if (maxkeylen % 8) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported AES-WRAP len %lu",
(unsigned long) maxkeylen);
return -1;
}
if (maxkeylen > sizeof(gd->gtk)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: AES-WRAP key data "
"too long (keydatalen=%lu maxkeylen=%lu)",
(unsigned long) key_data_len,
(unsigned long) maxkeylen);
return -1;
}
if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, maxkeylen / 8,
key_data, gd->gtk)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: AES unwrap failed - could not decrypt "
"GTK");
return -1;
}
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported key_info type %d", ver);
return -1;
}
gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
sm, !!(key_info & WPA_KEY_INFO_TXRX));
return 0;
}
static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
int ver, u16 key_info)
{
size_t mic_len, hdrlen, rlen;
struct wpa_eapol_key *reply;
u8 *rbuf, *key_mic;
mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
hdrlen = sizeof(*reply) + mic_len + 2;
rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
hdrlen, &rlen, (void *) &reply);
if (rbuf == NULL)
return -1;
reply->type = (sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
key_info |= ver | WPA_KEY_INFO_SECURE;
if (mic_len)
key_info |= WPA_KEY_INFO_MIC;
else
key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
WPA_PUT_BE16(reply->key_info, key_info);
if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN)
WPA_PUT_BE16(reply->key_length, 0);
else
os_memcpy(reply->key_length, key->key_length, 2);
os_memcpy(reply->replay_counter, key->replay_counter,
WPA_REPLAY_COUNTER_LEN);
key_mic = (u8 *) (reply + 1);
WPA_PUT_BE16(key_mic + mic_len, 0);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
return wpa_eapol_key_send(sm, &sm->ptk, ver, sm->bssid, ETH_P_EAPOL,
rbuf, rlen, key_mic);
}
static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
const unsigned char *src_addr,
const struct wpa_eapol_key *key,
const u8 *key_data,
size_t key_data_len, u16 ver)
{
u16 key_info;
int rekey, ret;
struct wpa_gtk_data gd;
const u8 *key_rsc;
if (!sm->msg_3_of_4_ok && !wpa_fils_is_completed(sm)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Group Key Handshake started prior to completion of 4-way handshake");
goto failed;
}
os_memset(&gd, 0, sizeof(gd));
rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key "
"Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
key_info = WPA_GET_BE16(key->key_info);
if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
ret = wpa_supplicant_process_1_of_2_rsn(sm, key_data,
key_data_len, key_info,
&gd);
} else {
ret = wpa_supplicant_process_1_of_2_wpa(sm, key, key_data,
key_data_len,
key_info, ver, &gd);
}
wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
if (ret)
goto failed;
key_rsc = key->key_rsc;
if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc))
key_rsc = null_rsc;
if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0) ||
wpa_supplicant_send_2_of_2(sm, key, ver, key_info) < 0)
goto failed;
os_memset(&gd, 0, sizeof(gd));
if (rekey) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying "
"completed with " MACSTR " [GTK=%s]",
MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
wpa_sm_cancel_auth_timeout(sm);
wpa_sm_set_state(sm, WPA_COMPLETED);
} else {
wpa_supplicant_key_neg_complete(sm, sm->bssid,
key_info &
WPA_KEY_INFO_SECURE);
}
wpa_sm_set_rekey_offload(sm);
return;
failed:
os_memset(&gd, 0, sizeof(gd));
wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
}
static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
struct wpa_eapol_key *key,
u16 ver,
const u8 *buf, size_t len)
{
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
int ok = 0;
size_t mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
os_memcpy(mic, key + 1, mic_len);
if (sm->tptk_set) {
os_memset(key + 1, 0, mic_len);
if (wpa_eapol_key_mic(sm->tptk.kck, sm->tptk.kck_len,
sm->key_mgmt,
ver, buf, len, (u8 *) (key + 1)) < 0 ||
os_memcmp_const(mic, key + 1, mic_len) != 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Invalid EAPOL-Key MIC "
"when using TPTK - ignoring TPTK");
} else {
ok = 1;
sm->tptk_set = 0;
sm->ptk_set = 1;
os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
os_memset(&sm->tptk, 0, sizeof(sm->tptk));
/*
* This assures the same TPTK in sm->tptk can never be
* copied twice to sm->ptk as the new PTK. In
* combination with the installed flag in the wpa_ptk
* struct, this assures the same PTK is only installed
* once.
*/
sm->renew_snonce = 1;
}
}
if (!ok && sm->ptk_set) {
os_memset(key + 1, 0, mic_len);
if (wpa_eapol_key_mic(sm->ptk.kck, sm->ptk.kck_len,
sm->key_mgmt,
ver, buf, len, (u8 *) (key + 1)) < 0 ||
os_memcmp_const(mic, key + 1, mic_len) != 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Invalid EAPOL-Key MIC - "
"dropping packet");
return -1;
}
ok = 1;
}
if (!ok) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Could not verify EAPOL-Key MIC - "
"dropping packet");
return -1;
}
os_memcpy(sm->rx_replay_counter, key->replay_counter,
WPA_REPLAY_COUNTER_LEN);
sm->rx_replay_counter_set = 1;
return 0;
}
/* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */
static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
struct wpa_eapol_key *key,
size_t mic_len, u16 ver,
u8 *key_data, size_t *key_data_len)
{
wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
key_data, *key_data_len);
if (!sm->ptk_set) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: PTK not available, cannot decrypt EAPOL-Key Key "
"Data");
return -1;
}
/* Decrypt key data here so that this operation does not need
* to be implemented separately for each message type. */
if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) {
#ifdef CONFIG_NO_RC4
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: RC4 not supported in the build");
return -1;
#else /* CONFIG_NO_RC4 */
u8 ek[32];
wpa_printf(MSG_DEBUG, "WPA: Decrypt Key Data using RC4");
os_memcpy(ek, key->key_iv, 16);
os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len);
if (rc4_skip(ek, 32, 256, key_data, *key_data_len)) {
os_memset(ek, 0, sizeof(ek));
wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
"WPA: RC4 failed");
return -1;
}
os_memset(ek, 0, sizeof(ek));
#endif /* CONFIG_NO_RC4 */
} else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
ver == WPA_KEY_INFO_TYPE_AES_128_CMAC ||
wpa_use_aes_key_wrap(sm->key_mgmt)) {
u8 *buf;
wpa_printf(MSG_DEBUG,
"WPA: Decrypt Key Data using AES-UNWRAP (KEK length %u)",
(unsigned int) sm->ptk.kek_len);
if (*key_data_len < 8 || *key_data_len % 8) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported AES-WRAP len %u",
(unsigned int) *key_data_len);
return -1;
}
*key_data_len -= 8; /* AES-WRAP adds 8 bytes */
buf = os_malloc(*key_data_len);
if (buf == NULL) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: No memory for AES-UNWRAP buffer");
return -1;
}
if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, *key_data_len / 8,
key_data, buf)) {
bin_clear_free(buf, *key_data_len);
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: AES unwrap failed - "
"could not decrypt EAPOL-Key key data");
return -1;
}
os_memcpy(key_data, buf, *key_data_len);
bin_clear_free(buf, *key_data_len);
WPA_PUT_BE16(((u8 *) (key + 1)) + mic_len, *key_data_len);
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Unsupported key_info type %d", ver);
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
key_data, *key_data_len);
return 0;
}
/**
* wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
* @sm: Pointer to WPA state machine data from wpa_sm_init()
*/
void wpa_sm_aborted_cached(struct wpa_sm *sm)
{
if (sm && sm->cur_pmksa) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: Cancelling PMKSA caching attempt");
sm->cur_pmksa = NULL;
}
}
static void wpa_eapol_key_dump(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
unsigned int key_data_len,
const u8 *mic, unsigned int mic_len)
{
#ifndef CONFIG_NO_STDOUT_DEBUG
u16 key_info = WPA_GET_BE16(key->key_info);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
" key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)",
key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
(key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
WPA_KEY_INFO_KEY_INDEX_SHIFT,
(key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
" key_length=%u key_data_length=%u",
WPA_GET_BE16(key->key_length), key_data_len);
wpa_hexdump(MSG_DEBUG, " replay_counter",
key->replay_counter, WPA_REPLAY_COUNTER_LEN);
wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16);
wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8);
wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8);
wpa_hexdump(MSG_DEBUG, " key_mic", mic, mic_len);
#endif /* CONFIG_NO_STDOUT_DEBUG */
}
#ifdef CONFIG_FILS
static int wpa_supp_aead_decrypt(struct wpa_sm *sm, u8 *buf, size_t buf_len,
size_t *key_data_len)
{
struct wpa_ptk *ptk;
struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
u8 *pos, *tmp;
const u8 *aad[1];
size_t aad_len[1];
if (*key_data_len < AES_BLOCK_SIZE) {
wpa_printf(MSG_INFO, "No room for AES-SIV data in the frame");
return -1;
}
if (sm->tptk_set)
ptk = &sm->tptk;
else if (sm->ptk_set)
ptk = &sm->ptk;
else
return -1;
hdr = (struct ieee802_1x_hdr *) buf;
key = (struct wpa_eapol_key *) (hdr + 1);
pos = (u8 *) (key + 1);
pos += 2; /* Pointing at the Encrypted Key Data field */
tmp = os_malloc(*key_data_len);
if (!tmp)
return -1;
/* AES-SIV AAD from EAPOL protocol version field (inclusive) to
* to Key Data (exclusive). */
aad[0] = buf;
aad_len[0] = pos - buf;
if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, *key_data_len,
1, aad, aad_len, tmp) < 0) {
wpa_printf(MSG_INFO, "Invalid AES-SIV data in the frame");
bin_clear_free(tmp, *key_data_len);
return -1;
}
/* AEAD decryption and validation completed successfully */
(*key_data_len) -= AES_BLOCK_SIZE;
wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
tmp, *key_data_len);
/* Replace Key Data field with the decrypted version */
os_memcpy(pos, tmp, *key_data_len);
pos -= 2; /* Key Data Length field */
WPA_PUT_BE16(pos, *key_data_len);
bin_clear_free(tmp, *key_data_len);
if (sm->tptk_set) {
sm->tptk_set = 0;
sm->ptk_set = 1;
os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
os_memset(&sm->tptk, 0, sizeof(sm->tptk));
}
os_memcpy(sm->rx_replay_counter, key->replay_counter,
WPA_REPLAY_COUNTER_LEN);
sm->rx_replay_counter_set = 1;
return 0;
}
#endif /* CONFIG_FILS */
/**
* wpa_sm_rx_eapol - Process received WPA EAPOL frames
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @src_addr: Source MAC address of the EAPOL packet
* @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
* @len: Length of the EAPOL frame
* Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
*
* This function is called for each received EAPOL frame. Other than EAPOL-Key
* frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
* only processing WPA and WPA2 EAPOL-Key frames.
*
* The received EAPOL-Key packets are validated and valid packets are replied
* to. In addition, key material (PTK, GTK) is configured at the end of a
* successful key handshake.
*/
int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
const u8 *buf, size_t len)
{
size_t plen, data_len, key_data_len;
const struct ieee802_1x_hdr *hdr;
struct wpa_eapol_key *key;
u16 key_info, ver;
u8 *tmp = NULL;
int ret = -1;
u8 *mic, *key_data;
size_t mic_len, keyhdrlen;
#ifdef CONFIG_IEEE80211R
sm->ft_completed = 0;
#endif /* CONFIG_IEEE80211R */
mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
keyhdrlen = sizeof(*key) + mic_len + 2;
if (len < sizeof(*hdr) + keyhdrlen) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: EAPOL frame too short to be a WPA "
"EAPOL-Key (len %lu, expecting at least %lu)",
(unsigned long) len,
(unsigned long) sizeof(*hdr) + keyhdrlen);
return 0;
}
hdr = (const struct ieee802_1x_hdr *) buf;
plen = be_to_host16(hdr->length);
data_len = plen + sizeof(*hdr);
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"IEEE 802.1X RX: version=%d type=%d length=%lu",
hdr->version, hdr->type, (unsigned long) plen);
if (hdr->version < EAPOL_VERSION) {
/* TODO: backwards compatibility */
}
if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: EAPOL frame (type %u) discarded, "
"not a Key frame", hdr->type);
ret = 0;
goto out;
}
wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", buf, len);
if (plen > len - sizeof(*hdr) || plen < keyhdrlen) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: EAPOL frame payload size %lu "
"invalid (frame size %lu)",
(unsigned long) plen, (unsigned long) len);
ret = 0;
goto out;
}
if (data_len < len) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: ignoring %lu bytes after the IEEE 802.1X data",
(unsigned long) len - data_len);
}
/*
* Make a copy of the frame since we need to modify the buffer during
* MAC validation and Key Data decryption.
*/
tmp = os_memdup(buf, data_len);
if (tmp == NULL)
goto out;
key = (struct wpa_eapol_key *) (tmp + sizeof(struct ieee802_1x_hdr));
mic = (u8 *) (key + 1);
key_data = mic + mic_len + 2;
if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
{
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: EAPOL-Key type (%d) unknown, discarded",
key->type);
ret = 0;
goto out;
}
key_data_len = WPA_GET_BE16(mic + mic_len);
wpa_eapol_key_dump(sm, key, key_data_len, mic, mic_len);
if (key_data_len > plen - keyhdrlen) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
"frame - key_data overflow (%u > %u)",
(unsigned int) key_data_len,
(unsigned int) (plen - keyhdrlen));
goto out;
}
eapol_sm_notify_lower_layer_success(sm->eapol, 0);
key_info = WPA_GET_BE16(key->key_info);
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
#if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W)
ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
#endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */
ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES &&
!wpa_use_akm_defined(sm->key_mgmt)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Unsupported EAPOL-Key descriptor version %d",
ver);
goto out;
}
if (wpa_use_akm_defined(sm->key_mgmt) &&
ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: Unsupported EAPOL-Key descriptor version %d (expected AKM defined = 0)",
ver);
goto out;
}
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt)) {
/* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
!wpa_use_akm_defined(sm->key_mgmt)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"FT: AP did not use AES-128-CMAC");
goto out;
}
} else
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211W
if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
!wpa_use_akm_defined(sm->key_mgmt)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: AP did not use the "
"negotiated AES-128-CMAC");
goto out;
}
} else
#endif /* CONFIG_IEEE80211W */
if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
!wpa_use_akm_defined(sm->key_mgmt) &&
ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: CCMP is used, but EAPOL-Key "
"descriptor version (%d) is not 2", ver);
if (sm->group_cipher != WPA_CIPHER_CCMP &&
!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
/* Earlier versions of IEEE 802.11i did not explicitly
* require version 2 descriptor for all EAPOL-Key
* packets, so allow group keys to use version 1 if
* CCMP is not used for them. */
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Backwards compatibility: allow invalid "
"version for non-CCMP group keys");
} else if (ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Interoperability workaround: allow incorrect (should have been HMAC-SHA1), but stronger (is AES-128-CMAC), descriptor version to be used");
} else
goto out;
} else if (sm->pairwise_cipher == WPA_CIPHER_GCMP &&
!wpa_use_akm_defined(sm->key_mgmt) &&
ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: GCMP is used, but EAPOL-Key "
"descriptor version (%d) is not 2", ver);
goto out;
}
if (sm->rx_replay_counter_set &&
os_memcmp(key->replay_counter, sm->rx_replay_counter,
WPA_REPLAY_COUNTER_LEN) <= 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: EAPOL-Key Replay Counter did not increase - "
"dropping packet");
goto out;
}
if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: Unsupported SMK bit in key_info");
goto out;
}
if (!(key_info & WPA_KEY_INFO_ACK)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: No Ack bit in key_info");
goto out;
}
if (key_info & WPA_KEY_INFO_REQUEST) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"WPA: EAPOL-Key with Request bit - dropped");
goto out;
}
if ((key_info & WPA_KEY_INFO_MIC) &&
wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
goto out;
#ifdef CONFIG_FILS
if (!mic_len && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
if (wpa_supp_aead_decrypt(sm, tmp, data_len, &key_data_len))
goto out;
}
#endif /* CONFIG_FILS */
if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) &&
(key_info & WPA_KEY_INFO_ENCR_KEY_DATA) && mic_len) {
if (wpa_supplicant_decrypt_key_data(sm, key, mic_len,
ver, key_data,
&key_data_len))
goto out;
}
if (key_info & WPA_KEY_INFO_KEY_TYPE) {
if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: Ignored EAPOL-Key (Pairwise) with "
"non-zero key index");
goto out;
}
if (key_info & (WPA_KEY_INFO_MIC |
WPA_KEY_INFO_ENCR_KEY_DATA)) {
/* 3/4 4-Way Handshake */
wpa_supplicant_process_3_of_4(sm, key, ver, key_data,
key_data_len);
} else {
/* 1/4 4-Way Handshake */
wpa_supplicant_process_1_of_4(sm, src_addr, key,
ver, key_data,
key_data_len);
}
} else {
if ((mic_len && (key_info & WPA_KEY_INFO_MIC)) ||
(!mic_len && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA))) {
/* 1/2 Group Key Handshake */
wpa_supplicant_process_1_of_2(sm, src_addr, key,
key_data, key_data_len,
ver);
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"WPA: EAPOL-Key (Group) without Mic/Encr bit - "
"dropped");
}
}
ret = 1;
out:
bin_clear_free(tmp, data_len);
return ret;
}
#ifdef CONFIG_CTRL_IFACE
static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
{
switch (sm->key_mgmt) {
case WPA_KEY_MGMT_IEEE8021X:
return ((sm->proto == WPA_PROTO_RSN ||
sm->proto == WPA_PROTO_OSEN) ?
RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
case WPA_KEY_MGMT_PSK:
return (sm->proto == WPA_PROTO_RSN ?
RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
#ifdef CONFIG_IEEE80211R
case WPA_KEY_MGMT_FT_IEEE8021X:
return RSN_AUTH_KEY_MGMT_FT_802_1X;
case WPA_KEY_MGMT_FT_PSK:
return RSN_AUTH_KEY_MGMT_FT_PSK;
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211W
case WPA_KEY_MGMT_IEEE8021X_SHA256:
return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
case WPA_KEY_MGMT_PSK_SHA256:
return RSN_AUTH_KEY_MGMT_PSK_SHA256;
#endif /* CONFIG_IEEE80211W */
case WPA_KEY_MGMT_CCKM:
return (sm->proto == WPA_PROTO_RSN ?
RSN_AUTH_KEY_MGMT_CCKM:
WPA_AUTH_KEY_MGMT_CCKM);
case WPA_KEY_MGMT_WPA_NONE:
return WPA_AUTH_KEY_MGMT_NONE;
case WPA_KEY_MGMT_IEEE8021X_SUITE_B:
return RSN_AUTH_KEY_MGMT_802_1X_SUITE_B;
case WPA_KEY_MGMT_IEEE8021X_SUITE_B_192:
return RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192;
default:
return 0;
}
}
#define RSN_SUITE "%02x-%02x-%02x-%d"
#define RSN_SUITE_ARG(s) \
((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
/**
* wpa_sm_get_mib - Dump text list of MIB entries
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @buf: Buffer for the list
* @buflen: Length of the buffer
* Returns: Number of bytes written to buffer
*
* This function is used fetch dot11 MIB variables.
*/
int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
{
char pmkid_txt[PMKID_LEN * 2 + 1];
int rsna, ret;
size_t len;
if (sm->cur_pmksa) {
wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
sm->cur_pmksa->pmkid, PMKID_LEN);
} else
pmkid_txt[0] = '\0';
if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
sm->proto == WPA_PROTO_RSN)
rsna = 1;
else
rsna = 0;
ret = os_snprintf(buf, buflen,
"dot11RSNAOptionImplemented=TRUE\n"
"dot11RSNAPreauthenticationImplemented=TRUE\n"
"dot11RSNAEnabled=%s\n"
"dot11RSNAPreauthenticationEnabled=%s\n"
"dot11RSNAConfigVersion=%d\n"
"dot11RSNAConfigPairwiseKeysSupported=5\n"
"dot11RSNAConfigGroupCipherSize=%d\n"
"dot11RSNAConfigPMKLifetime=%d\n"
"dot11RSNAConfigPMKReauthThreshold=%d\n"
"dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
"dot11RSNAConfigSATimeout=%d\n",
rsna ? "TRUE" : "FALSE",
rsna ? "TRUE" : "FALSE",
RSN_VERSION,
wpa_cipher_key_len(sm->group_cipher) * 8,
sm->dot11RSNAConfigPMKLifetime,
sm->dot11RSNAConfigPMKReauthThreshold,
sm->dot11RSNAConfigSATimeout);
if (os_snprintf_error(buflen, ret))
return 0;
len = ret;
ret = os_snprintf(
buf + len, buflen - len,
"dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
"dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
"dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
"dot11RSNAPMKIDUsed=%s\n"
"dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
"dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
"dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
"dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
"dot11RSNA4WayHandshakeFailures=%u\n",
RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
sm->pairwise_cipher)),
RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
sm->group_cipher)),
pmkid_txt,
RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
sm->pairwise_cipher)),
RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto,
sm->group_cipher)),
sm->dot11RSNA4WayHandshakeFailures);
if (!os_snprintf_error(buflen - len, ret))
len += ret;
return (int) len;
}
#endif /* CONFIG_CTRL_IFACE */
static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
void *ctx, enum pmksa_free_reason reason)
{
struct wpa_sm *sm = ctx;
int deauth = 0;
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: "
MACSTR " reason=%d", MAC2STR(entry->aa), reason);
if (sm->cur_pmksa == entry) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: %s current PMKSA entry",
reason == PMKSA_REPLACE ? "replaced" : "removed");
pmksa_cache_clear_current(sm);
/*
* If an entry is simply being replaced, there's no need to
* deauthenticate because it will be immediately re-added.
* This happens when EAP authentication is completed again
* (reauth or failed PMKSA caching attempt).
*/
if (reason != PMKSA_REPLACE)
deauth = 1;
}
if (reason == PMKSA_EXPIRE &&
(sm->pmk_len == entry->pmk_len &&
os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"RSN: deauthenticating due to expired PMK");
pmksa_cache_clear_current(sm);
deauth = 1;
}
if (deauth) {
sm->pmk_len = 0;
os_memset(sm->pmk, 0, sizeof(sm->pmk));
wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
}
}
/**
* wpa_sm_init - Initialize WPA state machine
* @ctx: Context pointer for callbacks; this needs to be an allocated buffer
* Returns: Pointer to the allocated WPA state machine data
*
* This function is used to allocate a new WPA state machine and the returned
* value is passed to all WPA state machine calls.
*/
struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
{
struct wpa_sm *sm;
sm = os_zalloc(sizeof(*sm));
if (sm == NULL)
return NULL;
dl_list_init(&sm->pmksa_candidates);
sm->renew_snonce = 1;
sm->ctx = ctx;
sm->dot11RSNAConfigPMKLifetime = 43200;
sm->dot11RSNAConfigPMKReauthThreshold = 70;
sm->dot11RSNAConfigSATimeout = 60;
sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
if (sm->pmksa == NULL) {
wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
"RSN: PMKSA cache initialization failed");
os_free(sm);
return NULL;
}
return sm;
}
/**
* wpa_sm_deinit - Deinitialize WPA state machine
* @sm: Pointer to WPA state machine data from wpa_sm_init()
*/
void wpa_sm_deinit(struct wpa_sm *sm)
{
if (sm == NULL)
return;
pmksa_cache_deinit(sm->pmksa);
eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
os_free(sm->assoc_wpa_ie);
os_free(sm->ap_wpa_ie);
os_free(sm->ap_rsn_ie);
wpa_sm_drop_sa(sm);
os_free(sm->ctx);
#ifdef CONFIG_IEEE80211R
os_free(sm->assoc_resp_ies);
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_TESTING_OPTIONS
wpabuf_free(sm->test_assoc_ie);
#endif /* CONFIG_TESTING_OPTIONS */
#ifdef CONFIG_FILS_SK_PFS
crypto_ecdh_deinit(sm->fils_ecdh);
#endif /* CONFIG_FILS_SK_PFS */
#ifdef CONFIG_FILS
wpabuf_free(sm->fils_ft_ies);
#endif /* CONFIG_FILS */
#ifdef CONFIG_OWE
crypto_ecdh_deinit(sm->owe_ecdh);
#endif /* CONFIG_OWE */
os_free(sm);
}
/**
* wpa_sm_notify_assoc - Notify WPA state machine about association
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @bssid: The BSSID of the new association
*
* This function is called to let WPA state machine know that the connection
* was established.
*/
void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
{
int clear_keys = 1;
if (sm == NULL)
return;
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: Association event - clear replay counter");
os_memcpy(sm->bssid, bssid, ETH_ALEN);
os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
sm->rx_replay_counter_set = 0;
sm->renew_snonce = 1;
if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
rsn_preauth_deinit(sm);
#ifdef CONFIG_IEEE80211R
if (wpa_ft_is_completed(sm)) {
/*
* Clear portValid to kick EAPOL state machine to re-enter
* AUTHENTICATED state to get the EAPOL port Authorized.
*/
eapol_sm_notify_portValid(sm->eapol, FALSE);
wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
/* Prepare for the next transition */
wpa_ft_prepare_auth_request(sm, NULL);
clear_keys = 0;
}
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_FILS
if (sm->fils_completed) {
/*
* Clear portValid to kick EAPOL state machine to re-enter
* AUTHENTICATED state to get the EAPOL port Authorized.
*/
wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
clear_keys = 0;
}
#endif /* CONFIG_FILS */
if (clear_keys) {
/*
* IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
* this is not part of a Fast BSS Transition.
*/
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK");
sm->ptk_set = 0;
os_memset(&sm->ptk, 0, sizeof(sm->ptk));
sm->tptk_set = 0;
os_memset(&sm->tptk, 0, sizeof(sm->tptk));
os_memset(&sm->gtk, 0, sizeof(sm->gtk));
os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep));
#ifdef CONFIG_IEEE80211W
os_memset(&sm->igtk, 0, sizeof(sm->igtk));
os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep));
#endif /* CONFIG_IEEE80211W */
}
#ifdef CONFIG_TDLS
wpa_tdls_assoc(sm);
#endif /* CONFIG_TDLS */
#ifdef CONFIG_P2P
os_memset(sm->p2p_ip_addr, 0, sizeof(sm->p2p_ip_addr));
#endif /* CONFIG_P2P */
}
/**
* wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
* @sm: Pointer to WPA state machine data from wpa_sm_init()
*
* This function is called to let WPA state machine know that the connection
* was lost. This will abort any existing pre-authentication session.
*/
void wpa_sm_notify_disassoc(struct wpa_sm *sm)
{
eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
rsn_preauth_deinit(sm);
pmksa_cache_clear_current(sm);
if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
sm->dot11RSNA4WayHandshakeFailures++;
#ifdef CONFIG_TDLS
wpa_tdls_disassoc(sm);
#endif /* CONFIG_TDLS */
#ifdef CONFIG_FILS
sm->fils_completed = 0;
#endif /* CONFIG_FILS */
#ifdef CONFIG_IEEE80211R
sm->ft_reassoc_completed = 0;
#endif /* CONFIG_IEEE80211R */
/* Keys are not needed in the WPA state machine anymore */
wpa_sm_drop_sa(sm);
sm->msg_3_of_4_ok = 0;
os_memset(sm->bssid, 0, ETH_ALEN);
}
/**
* wpa_sm_set_pmk - Set PMK
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @pmk: The new PMK
* @pmk_len: The length of the new PMK in bytes
* @pmkid: Calculated PMKID
* @bssid: AA to add into PMKSA cache or %NULL to not cache the PMK
*
* Configure the PMK for WPA state machine.
*/
void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len,
const u8 *pmkid, const u8 *bssid)
{
if (sm == NULL)
return;
wpa_hexdump_key(MSG_DEBUG, "WPA: Set PMK based on external data",
pmk, pmk_len);
sm->pmk_len = pmk_len;
os_memcpy(sm->pmk, pmk, pmk_len);
#ifdef CONFIG_IEEE80211R
/* Set XXKey to be PSK for FT key derivation */
sm->xxkey_len = pmk_len;
os_memcpy(sm->xxkey, pmk, pmk_len);
#endif /* CONFIG_IEEE80211R */
if (bssid) {
pmksa_cache_add(sm->pmksa, pmk, pmk_len, pmkid, NULL, 0,
bssid, sm->own_addr,
sm->network_ctx, sm->key_mgmt, NULL);
}
}
/**
* wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
* @sm: Pointer to WPA state machine data from wpa_sm_init()
*
* Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
* will be cleared.
*/
void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
{
if (sm == NULL)
return;
if (sm->cur_pmksa) {
wpa_hexdump_key(MSG_DEBUG,
"WPA: Set PMK based on current PMKSA",
sm->cur_pmksa->pmk, sm->cur_pmksa->pmk_len);
sm->pmk_len = sm->cur_pmksa->pmk_len;
os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
} else {
wpa_printf(MSG_DEBUG, "WPA: No current PMKSA - clear PMK");
sm->pmk_len = 0;
os_memset(sm->pmk, 0, PMK_LEN_MAX);
}
}
/**
* wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @fast_reauth: Whether fast reauthentication (EAP) is allowed
*/
void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
{
if (sm)
sm->fast_reauth = fast_reauth;
}
/**
* wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @scard_ctx: Context pointer for smartcard related callback functions
*/
void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
{
if (sm == NULL)
return;
sm->scard_ctx = scard_ctx;
if (sm->preauth_eapol)
eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
}
/**
* wpa_sm_set_config - Notification of current configration change
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @config: Pointer to current network configuration
*
* Notify WPA state machine that configuration has changed. config will be
* stored as a backpointer to network configuration. This can be %NULL to clear
* the stored pointed.
*/
void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
{
if (!sm)
return;
if (config) {
sm->network_ctx = config->network_ctx;
sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
sm->proactive_key_caching = config->proactive_key_caching;
sm->eap_workaround = config->eap_workaround;
sm->eap_conf_ctx = config->eap_conf_ctx;
if (config->ssid) {
os_memcpy(sm->ssid, config->ssid, config->ssid_len);
sm->ssid_len = config->ssid_len;
} else
sm->ssid_len = 0;
sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
sm->p2p = config->p2p;
sm->wpa_rsc_relaxation = config->wpa_rsc_relaxation;
#ifdef CONFIG_FILS
if (config->fils_cache_id) {
sm->fils_cache_id_set = 1;
os_memcpy(sm->fils_cache_id, config->fils_cache_id,
FILS_CACHE_ID_LEN);
} else {
sm->fils_cache_id_set = 0;
}
#endif /* CONFIG_FILS */
} else {
sm->network_ctx = NULL;
sm->allowed_pairwise_cipher = 0;
sm->proactive_key_caching = 0;
sm->eap_workaround = 0;
sm->eap_conf_ctx = NULL;
sm->ssid_len = 0;
sm->wpa_ptk_rekey = 0;
sm->p2p = 0;
sm->wpa_rsc_relaxation = 0;
}
}
/**
* wpa_sm_set_own_addr - Set own MAC address
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @addr: Own MAC address
*/
void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
{
if (sm)
os_memcpy(sm->own_addr, addr, ETH_ALEN);
}
/**
* wpa_sm_set_ifname - Set network interface name
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @ifname: Interface name
* @bridge_ifname: Optional bridge interface name (for pre-auth)
*/
void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
const char *bridge_ifname)
{
if (sm) {
sm->ifname = ifname;
sm->bridge_ifname = bridge_ifname;
}
}
/**
* wpa_sm_set_eapol - Set EAPOL state machine pointer
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
*/
void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
{
if (sm)
sm->eapol = eapol;
}
/**
* wpa_sm_set_param - Set WPA state machine parameters
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @param: Parameter field
* @value: Parameter value
* Returns: 0 on success, -1 on failure
*/
int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
unsigned int value)
{
int ret = 0;
if (sm == NULL)
return -1;
switch (param) {
case RSNA_PMK_LIFETIME:
if (value > 0)
sm->dot11RSNAConfigPMKLifetime = value;
else
ret = -1;
break;
case RSNA_PMK_REAUTH_THRESHOLD:
if (value > 0 && value <= 100)
sm->dot11RSNAConfigPMKReauthThreshold = value;
else
ret = -1;
break;
case RSNA_SA_TIMEOUT:
if (value > 0)
sm->dot11RSNAConfigSATimeout = value;
else
ret = -1;
break;
case WPA_PARAM_PROTO:
sm->proto = value;
break;
case WPA_PARAM_PAIRWISE:
sm->pairwise_cipher = value;
break;
case WPA_PARAM_GROUP:
sm->group_cipher = value;
break;
case WPA_PARAM_KEY_MGMT:
sm->key_mgmt = value;
break;
#ifdef CONFIG_IEEE80211W
case WPA_PARAM_MGMT_GROUP:
sm->mgmt_group_cipher = value;
break;
#endif /* CONFIG_IEEE80211W */
case WPA_PARAM_RSN_ENABLED:
sm->rsn_enabled = value;
break;
case WPA_PARAM_MFP:
sm->mfp = value;
break;
default:
break;
}
return ret;
}
/**
* wpa_sm_get_status - Get WPA state machine
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @buf: Buffer for status information
* @buflen: Maximum buffer length
* @verbose: Whether to include verbose status information
* Returns: Number of bytes written to buf.
*
* Query WPA state machine for status information. This function fills in
* a text area with current status information. If the buffer (buf) is not
* large enough, status information will be truncated to fit the buffer.
*/
int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
int verbose)
{
char *pos = buf, *end = buf + buflen;
int ret;
ret = os_snprintf(pos, end - pos,
"pairwise_cipher=%s\n"
"group_cipher=%s\n"
"key_mgmt=%s\n",
wpa_cipher_txt(sm->pairwise_cipher),
wpa_cipher_txt(sm->group_cipher),
wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
if (os_snprintf_error(end - pos, ret))
return pos - buf;
pos += ret;
if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) {
struct wpa_ie_data rsn;
if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn)
>= 0 &&
rsn.capabilities & (WPA_CAPABILITY_MFPR |
WPA_CAPABILITY_MFPC)) {
ret = os_snprintf(pos, end - pos, "pmf=%d\n"
"mgmt_group_cipher=%s\n",
(rsn.capabilities &
WPA_CAPABILITY_MFPR) ? 2 : 1,
wpa_cipher_txt(
sm->mgmt_group_cipher));
if (os_snprintf_error(end - pos, ret))
return pos - buf;
pos += ret;
}
}
return pos - buf;
}
int wpa_sm_pmf_enabled(struct wpa_sm *sm)
{
struct wpa_ie_data rsn;
if (sm->mfp == NO_MGMT_FRAME_PROTECTION || !sm->ap_rsn_ie)
return 0;
if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) >= 0 &&
rsn.capabilities & (WPA_CAPABILITY_MFPR | WPA_CAPABILITY_MFPC))
return 1;
return 0;
}
/**
* wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @wpa_ie: Pointer to buffer for WPA/RSN IE
* @wpa_ie_len: Pointer to the length of the wpa_ie buffer
* Returns: 0 on success, -1 on failure
*/
int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
size_t *wpa_ie_len)
{
int res;
if (sm == NULL)
return -1;
#ifdef CONFIG_TESTING_OPTIONS
if (sm->test_assoc_ie) {
wpa_printf(MSG_DEBUG,
"TESTING: Replace association WPA/RSN IE");
if (*wpa_ie_len < wpabuf_len(sm->test_assoc_ie))
return -1;
os_memcpy(wpa_ie, wpabuf_head(sm->test_assoc_ie),
wpabuf_len(sm->test_assoc_ie));
res = wpabuf_len(sm->test_assoc_ie);
} else
#endif /* CONFIG_TESTING_OPTIONS */
res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
if (res < 0)
return -1;
*wpa_ie_len = res;
wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
wpa_ie, *wpa_ie_len);
if (sm->assoc_wpa_ie == NULL) {
/*
* Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
* the correct version of the IE even if PMKSA caching is
* aborted (which would remove PMKID from IE generation).
*/
sm->assoc_wpa_ie = os_memdup(wpa_ie, *wpa_ie_len);
if (sm->assoc_wpa_ie == NULL)
return -1;
sm->assoc_wpa_ie_len = *wpa_ie_len;
} else {
wpa_hexdump(MSG_DEBUG,
"WPA: Leave previously set WPA IE default",
sm->assoc_wpa_ie, sm->assoc_wpa_ie_len);
}
return 0;
}
/**
* wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @ie: Pointer to IE data (starting from id)
* @len: IE length
* Returns: 0 on success, -1 on failure
*
* Inform WPA state machine about the WPA/RSN IE used in (Re)Association
* Request frame. The IE will be used to override the default value generated
* with wpa_sm_set_assoc_wpa_ie_default().
*/
int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
{
if (sm == NULL)
return -1;
os_free(sm->assoc_wpa_ie);
if (ie == NULL || len == 0) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: clearing own WPA/RSN IE");
sm->assoc_wpa_ie = NULL;
sm->assoc_wpa_ie_len = 0;
} else {
wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
sm->assoc_wpa_ie = os_memdup(ie, len);
if (sm->assoc_wpa_ie == NULL)
return -1;
sm->assoc_wpa_ie_len = len;
}
return 0;
}
/**
* wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @ie: Pointer to IE data (starting from id)
* @len: IE length
* Returns: 0 on success, -1 on failure
*
* Inform WPA state machine about the WPA IE used in Beacon / Probe Response
* frame.
*/
int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
{
if (sm == NULL)
return -1;
os_free(sm->ap_wpa_ie);
if (ie == NULL || len == 0) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: clearing AP WPA IE");
sm->ap_wpa_ie = NULL;
sm->ap_wpa_ie_len = 0;
} else {
wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
sm->ap_wpa_ie = os_memdup(ie, len);
if (sm->ap_wpa_ie == NULL)
return -1;
sm->ap_wpa_ie_len = len;
}
return 0;
}
/**
* wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @ie: Pointer to IE data (starting from id)
* @len: IE length
* Returns: 0 on success, -1 on failure
*
* Inform WPA state machine about the RSN IE used in Beacon / Probe Response
* frame.
*/
int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
{
if (sm == NULL)
return -1;
os_free(sm->ap_rsn_ie);
if (ie == NULL || len == 0) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: clearing AP RSN IE");
sm->ap_rsn_ie = NULL;
sm->ap_rsn_ie_len = 0;
} else {
wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
sm->ap_rsn_ie = os_memdup(ie, len);
if (sm->ap_rsn_ie == NULL)
return -1;
sm->ap_rsn_ie_len = len;
}
return 0;
}
/**
* wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @data: Pointer to data area for parsing results
* Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
*
* Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
* parsed data into data.
*/
int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
{
if (sm == NULL)
return -1;
if (sm->assoc_wpa_ie == NULL) {
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
"WPA: No WPA/RSN IE available from association info");
return -1;
}
if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
return -2;
return 0;
}
int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len)
{
return pmksa_cache_list(sm->pmksa, buf, len);
}
struct rsn_pmksa_cache_entry * wpa_sm_pmksa_cache_head(struct wpa_sm *sm)
{
return pmksa_cache_head(sm->pmksa);
}
struct rsn_pmksa_cache_entry *
wpa_sm_pmksa_cache_add_entry(struct wpa_sm *sm,
struct rsn_pmksa_cache_entry * entry)
{
return pmksa_cache_add_entry(sm->pmksa, entry);
}
void wpa_sm_pmksa_cache_add(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len,
const u8 *pmkid, const u8 *bssid,
const u8 *fils_cache_id)
{
sm->cur_pmksa = pmksa_cache_add(sm->pmksa, pmk, pmk_len, pmkid, NULL, 0,
bssid, sm->own_addr, sm->network_ctx,
sm->key_mgmt, fils_cache_id);
}
int wpa_sm_pmksa_exists(struct wpa_sm *sm, const u8 *bssid,
const void *network_ctx)
{
return pmksa_cache_get(sm->pmksa, bssid, NULL, network_ctx, 0) != NULL;
}
void wpa_sm_drop_sa(struct wpa_sm *sm)
{
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK");
sm->ptk_set = 0;
sm->tptk_set = 0;
sm->pmk_len = 0;
os_memset(sm->pmk, 0, sizeof(sm->pmk));
os_memset(&sm->ptk, 0, sizeof(sm->ptk));
os_memset(&sm->tptk, 0, sizeof(sm->tptk));
os_memset(&sm->gtk, 0, sizeof(sm->gtk));
os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep));
#ifdef CONFIG_IEEE80211W
os_memset(&sm->igtk, 0, sizeof(sm->igtk));
os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep));
#endif /* CONFIG_IEEE80211W */
#ifdef CONFIG_IEEE80211R
os_memset(sm->xxkey, 0, sizeof(sm->xxkey));
os_memset(sm->pmk_r0, 0, sizeof(sm->pmk_r0));
os_memset(sm->pmk_r1, 0, sizeof(sm->pmk_r1));
#endif /* CONFIG_IEEE80211R */
}
int wpa_sm_has_ptk(struct wpa_sm *sm)
{
if (sm == NULL)
return 0;
return sm->ptk_set;
}
void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr)
{
os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN);
}
void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx)
{
pmksa_cache_flush(sm->pmksa, network_ctx, NULL, 0);
}
#ifdef CONFIG_WNM
int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf)
{
u16 keyinfo;
u8 keylen; /* plaintext key len */
u8 *key_rsc;
if (subelem_id == WNM_SLEEP_SUBELEM_GTK) {
struct wpa_gtk_data gd;
os_memset(&gd, 0, sizeof(gd));
keylen = wpa_cipher_key_len(sm->group_cipher);
gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
gd.alg = wpa_cipher_to_alg(sm->group_cipher);
if (gd.alg == WPA_ALG_NONE) {
wpa_printf(MSG_DEBUG, "Unsupported group cipher suite");
return -1;
}
key_rsc = buf + 5;
keyinfo = WPA_GET_LE16(buf + 2);
gd.gtk_len = keylen;
if (gd.gtk_len != buf[4]) {
wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d",
gd.gtk_len, buf[4]);
return -1;
}
gd.keyidx = keyinfo & 0x03; /* B0 - B1 */
gd.tx = wpa_supplicant_gtk_tx_bit_workaround(
sm, !!(keyinfo & WPA_KEY_INFO_TXRX));
os_memcpy(gd.gtk, buf + 13, gd.gtk_len);
wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)",
gd.gtk, gd.gtk_len);
if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 1)) {
os_memset(&gd, 0, sizeof(gd));
wpa_printf(MSG_DEBUG, "Failed to install the GTK in "
"WNM mode");
return -1;
}
os_memset(&gd, 0, sizeof(gd));
#ifdef CONFIG_IEEE80211W
} else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) {
const struct wpa_igtk_kde *igtk;
igtk = (const struct wpa_igtk_kde *) (buf + 2);
if (wpa_supplicant_install_igtk(sm, igtk, 1) < 0)
return -1;
#endif /* CONFIG_IEEE80211W */
} else {
wpa_printf(MSG_DEBUG, "Unknown element id");
return -1;
}
return 0;
}
#endif /* CONFIG_WNM */
#ifdef CONFIG_P2P
int wpa_sm_get_p2p_ip_addr(struct wpa_sm *sm, u8 *buf)
{
if (sm == NULL || WPA_GET_BE32(sm->p2p_ip_addr) == 0)
return -1;
os_memcpy(buf, sm->p2p_ip_addr, 3 * 4);
return 0;
}
#endif /* CONFIG_P2P */
void wpa_sm_set_rx_replay_ctr(struct wpa_sm *sm, const u8 *rx_replay_counter)
{
if (rx_replay_counter == NULL)
return;
os_memcpy(sm->rx_replay_counter, rx_replay_counter,
WPA_REPLAY_COUNTER_LEN);
sm->rx_replay_counter_set = 1;
wpa_printf(MSG_DEBUG, "Updated key replay counter");
}
void wpa_sm_set_ptk_kck_kek(struct wpa_sm *sm,
const u8 *ptk_kck, size_t ptk_kck_len,
const u8 *ptk_kek, size_t ptk_kek_len)
{
if (ptk_kck && ptk_kck_len <= WPA_KCK_MAX_LEN) {
os_memcpy(sm->ptk.kck, ptk_kck, ptk_kck_len);
sm->ptk.kck_len = ptk_kck_len;
wpa_printf(MSG_DEBUG, "Updated PTK KCK");
}
if (ptk_kek && ptk_kek_len <= WPA_KEK_MAX_LEN) {
os_memcpy(sm->ptk.kek, ptk_kek, ptk_kek_len);
sm->ptk.kek_len = ptk_kek_len;
wpa_printf(MSG_DEBUG, "Updated PTK KEK");
}
sm->ptk_set = 1;
}
#ifdef CONFIG_TESTING_OPTIONS
void wpa_sm_set_test_assoc_ie(struct wpa_sm *sm, struct wpabuf *buf)
{
wpabuf_free(sm->test_assoc_ie);
sm->test_assoc_ie = buf;
}
const u8 * wpa_sm_get_anonce(struct wpa_sm *sm)
{
return sm->anonce;
}
#endif /* CONFIG_TESTING_OPTIONS */
#ifdef CONFIG_FILS
struct wpabuf * fils_build_auth(struct wpa_sm *sm, int dh_group, const u8 *md)
{
struct wpabuf *buf = NULL;
struct wpabuf *erp_msg;
struct wpabuf *pub = NULL;
erp_msg = eapol_sm_build_erp_reauth_start(sm->eapol);
if (!erp_msg && !sm->cur_pmksa) {
wpa_printf(MSG_DEBUG,
"FILS: Neither ERP EAP-Initiate/Re-auth nor PMKSA cache entry is available - skip FILS");
goto fail;
}
wpa_printf(MSG_DEBUG, "FILS: Try to use FILS (erp=%d pmksa_cache=%d)",
erp_msg != NULL, sm->cur_pmksa != NULL);
sm->fils_completed = 0;
if (!sm->assoc_wpa_ie) {
wpa_printf(MSG_INFO, "FILS: No own RSN IE set for FILS");
goto fail;
}
if (random_get_bytes(sm->fils_nonce, FILS_NONCE_LEN) < 0 ||
random_get_bytes(sm->fils_session, FILS_SESSION_LEN) < 0)
goto fail;
wpa_hexdump(MSG_DEBUG, "FILS: Generated FILS Nonce",
sm->fils_nonce, FILS_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FILS: Generated FILS Session",
sm->fils_session, FILS_SESSION_LEN);
#ifdef CONFIG_FILS_SK_PFS
sm->fils_dh_group = dh_group;
if (dh_group) {
crypto_ecdh_deinit(sm->fils_ecdh);
sm->fils_ecdh = crypto_ecdh_init(dh_group);
if (!sm->fils_ecdh) {
wpa_printf(MSG_INFO,
"FILS: Could not initialize ECDH with group %d",
dh_group);
goto fail;
}
pub = crypto_ecdh_get_pubkey(sm->fils_ecdh, 1);
if (!pub)
goto fail;
wpa_hexdump_buf(MSG_DEBUG, "FILS: Element (DH public key)",
pub);
sm->fils_dh_elem_len = wpabuf_len(pub);
}
#endif /* CONFIG_FILS_SK_PFS */
buf = wpabuf_alloc(1000 + sm->assoc_wpa_ie_len +
(pub ? wpabuf_len(pub) : 0));
if (!buf)
goto fail;
/* Fields following the Authentication algorithm number field */
/* Authentication Transaction seq# */
wpabuf_put_le16(buf, 1);
/* Status Code */
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
/* TODO: FILS PK */
#ifdef CONFIG_FILS_SK_PFS
if (dh_group) {
/* Finite Cyclic Group */
wpabuf_put_le16(buf, dh_group);
/* Element */
wpabuf_put_buf(buf, pub);
}
#endif /* CONFIG_FILS_SK_PFS */
/* RSNE */
wpa_hexdump(MSG_DEBUG, "FILS: RSNE in FILS Authentication frame",
sm->assoc_wpa_ie, sm->assoc_wpa_ie_len);
wpabuf_put_data(buf, sm->assoc_wpa_ie, sm->assoc_wpa_ie_len);
if (md) {
/* MDE when using FILS for FT initial association */
struct rsn_mdie *mdie;
wpabuf_put_u8(buf, WLAN_EID_MOBILITY_DOMAIN);
wpabuf_put_u8(buf, sizeof(*mdie));
mdie = wpabuf_put(buf, sizeof(*mdie));
os_memcpy(mdie->mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
mdie->ft_capab = 0;
}
/* FILS Nonce */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
wpabuf_put_u8(buf, 1 + FILS_NONCE_LEN); /* Length */
/* Element ID Extension */
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_NONCE);
wpabuf_put_data(buf, sm->fils_nonce, FILS_NONCE_LEN);
/* FILS Session */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
wpabuf_put_u8(buf, 1 + FILS_SESSION_LEN); /* Length */
/* Element ID Extension */
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_SESSION);
wpabuf_put_data(buf, sm->fils_session, FILS_SESSION_LEN);
/* FILS Wrapped Data */
sm->fils_erp_pmkid_set = 0;
if (erp_msg) {
wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
wpabuf_put_u8(buf, 1 + wpabuf_len(erp_msg)); /* Length */
/* Element ID Extension */
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_WRAPPED_DATA);
wpabuf_put_buf(buf, erp_msg);
/* Calculate pending PMKID here so that we do not need to
* maintain a copy of the EAP-Initiate/Reauth message. */
if (fils_pmkid_erp(sm->key_mgmt, wpabuf_head(erp_msg),
wpabuf_len(erp_msg),
sm->fils_erp_pmkid) == 0)
sm->fils_erp_pmkid_set = 1;
}
wpa_hexdump_buf(MSG_DEBUG, "RSN: FILS fields for Authentication frame",
buf);
fail:
wpabuf_free(erp_msg);
wpabuf_free(pub);
return buf;
}
int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
size_t len)
{
const u8 *pos, *end;
struct ieee802_11_elems elems;
struct wpa_ie_data rsn;
int pmkid_match = 0;
u8 ick[FILS_ICK_MAX_LEN];
size_t ick_len;
int res;
struct wpabuf *dh_ss = NULL;
const u8 *g_sta = NULL;
size_t g_sta_len = 0;
const u8 *g_ap = NULL;
size_t g_ap_len = 0;
struct wpabuf *pub = NULL;
os_memcpy(sm->bssid, bssid, ETH_ALEN);
wpa_hexdump(MSG_DEBUG, "FILS: Authentication frame fields",
data, len);
pos = data;
end = data + len;
/* TODO: FILS PK */
#ifdef CONFIG_FILS_SK_PFS
if (sm->fils_dh_group) {
u16 group;
/* Using FILS PFS */
/* Finite Cyclic Group */
if (end - pos < 2) {
wpa_printf(MSG_DEBUG,
"FILS: No room for Finite Cyclic Group");
goto fail;
}
group = WPA_GET_LE16(pos);
pos += 2;
if (group != sm->fils_dh_group) {
wpa_printf(MSG_DEBUG,
"FILS: Unexpected change in Finite Cyclic Group: %u (expected %u)",
group, sm->fils_dh_group);
goto fail;
}
/* Element */
if ((size_t) (end - pos) < sm->fils_dh_elem_len) {
wpa_printf(MSG_DEBUG, "FILS: No room for Element");
goto fail;
}
if (!sm->fils_ecdh) {
wpa_printf(MSG_DEBUG, "FILS: No ECDH state available");
goto fail;
}
dh_ss = crypto_ecdh_set_peerkey(sm->fils_ecdh, 1, pos,
sm->fils_dh_elem_len);
if (!dh_ss) {
wpa_printf(MSG_DEBUG, "FILS: ECDH operation failed");
goto fail;
}
wpa_hexdump_buf_key(MSG_DEBUG, "FILS: DH_SS", dh_ss);
g_ap = pos;
g_ap_len = sm->fils_dh_elem_len;
pos += sm->fils_dh_elem_len;
}
#endif /* CONFIG_FILS_SK_PFS */
wpa_hexdump(MSG_DEBUG, "FILS: Remaining IEs", pos, end - pos);
if (ieee802_11_parse_elems(pos, end - pos, &elems, 1) == ParseFailed) {
wpa_printf(MSG_DEBUG, "FILS: Could not parse elements");
goto fail;
}
/* RSNE */
wpa_hexdump(MSG_DEBUG, "FILS: RSN element", elems.rsn_ie,
elems.rsn_ie_len);
if (!elems.rsn_ie ||
wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2, elems.rsn_ie_len + 2,
&rsn) < 0) {
wpa_printf(MSG_DEBUG, "FILS: No RSN element");
goto fail;
}
if (!elems.fils_nonce) {
wpa_printf(MSG_DEBUG, "FILS: No FILS Nonce field");
goto fail;
}
os_memcpy(sm->fils_anonce, elems.fils_nonce, FILS_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FILS: ANonce", sm->fils_anonce, FILS_NONCE_LEN);
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt)) {
struct wpa_ft_ies parse;
if (!elems.mdie || !elems.ftie) {
wpa_printf(MSG_DEBUG, "FILS+FT: No MDE or FTE");
goto fail;
}
if (wpa_ft_parse_ies(pos, end - pos, &parse) < 0) {
wpa_printf(MSG_DEBUG, "FILS+FT: Failed to parse IEs");
goto fail;
}
if (!parse.r0kh_id) {
wpa_printf(MSG_DEBUG,
"FILS+FT: No R0KH-ID subelem in FTE");
goto fail;
}
os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
sm->r0kh_id_len = parse.r0kh_id_len;
wpa_hexdump_ascii(MSG_DEBUG, "FILS+FT: R0KH-ID",
sm->r0kh_id, sm->r0kh_id_len);
if (!parse.r1kh_id) {
wpa_printf(MSG_DEBUG,
"FILS+FT: No R1KH-ID subelem in FTE");
goto fail;
}
os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
wpa_hexdump(MSG_DEBUG, "FILS+FT: R1KH-ID",
sm->r1kh_id, FT_R1KH_ID_LEN);
/* TODO: Check MDE and FTE payload */
wpabuf_free(sm->fils_ft_ies);
sm->fils_ft_ies = wpabuf_alloc(2 + elems.mdie_len +
2 + elems.ftie_len);
if (!sm->fils_ft_ies)
goto fail;
wpabuf_put_data(sm->fils_ft_ies, elems.mdie - 2,
2 + elems.mdie_len);
wpabuf_put_data(sm->fils_ft_ies, elems.ftie - 2,
2 + elems.ftie_len);
} else {
wpabuf_free(sm->fils_ft_ies);
sm->fils_ft_ies = NULL;
}
#endif /* CONFIG_IEEE80211R */
/* PMKID List */
if (rsn.pmkid && rsn.num_pmkid > 0) {
wpa_hexdump(MSG_DEBUG, "FILS: PMKID List",
rsn.pmkid, rsn.num_pmkid * PMKID_LEN);
if (rsn.num_pmkid != 1) {
wpa_printf(MSG_DEBUG, "FILS: Invalid PMKID selection");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "FILS: PMKID", rsn.pmkid, PMKID_LEN);
if (os_memcmp(sm->cur_pmksa->pmkid, rsn.pmkid, PMKID_LEN) != 0)
{
wpa_printf(MSG_DEBUG, "FILS: PMKID mismatch");
wpa_hexdump(MSG_DEBUG, "FILS: Expected PMKID",
sm->cur_pmksa->pmkid, PMKID_LEN);
goto fail;
}
wpa_printf(MSG_DEBUG,
"FILS: Matching PMKID - continue using PMKSA caching");
pmkid_match = 1;
}
if (!pmkid_match && sm->cur_pmksa) {
wpa_printf(MSG_DEBUG,
"FILS: No PMKID match - cannot use cached PMKSA entry");
sm->cur_pmksa = NULL;
}
/* FILS Session */
if (!elems.fils_session) {
wpa_printf(MSG_DEBUG, "FILS: No FILS Session element");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "FILS: FILS Session", elems.fils_session,
FILS_SESSION_LEN);
if (os_memcmp(sm->fils_session, elems.fils_session, FILS_SESSION_LEN)
!= 0) {
wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
sm->fils_session, FILS_SESSION_LEN);
goto fail;
}
/* FILS Wrapped Data */
if (!sm->cur_pmksa && elems.fils_wrapped_data) {
u8 rmsk[ERP_MAX_KEY_LEN];
size_t rmsk_len;
wpa_hexdump(MSG_DEBUG, "FILS: Wrapped Data",
elems.fils_wrapped_data,
elems.fils_wrapped_data_len);
eapol_sm_process_erp_finish(sm->eapol, elems.fils_wrapped_data,
elems.fils_wrapped_data_len);
if (eapol_sm_failed(sm->eapol))
goto fail;
rmsk_len = ERP_MAX_KEY_LEN;
res = eapol_sm_get_key(sm->eapol, rmsk, rmsk_len);
if (res == PMK_LEN) {
rmsk_len = PMK_LEN;
res = eapol_sm_get_key(sm->eapol, rmsk, rmsk_len);
}
if (res)
goto fail;
res = fils_rmsk_to_pmk(sm->key_mgmt, rmsk, rmsk_len,
sm->fils_nonce, sm->fils_anonce,
dh_ss ? wpabuf_head(dh_ss) : NULL,
dh_ss ? wpabuf_len(dh_ss) : 0,
sm->pmk, &sm->pmk_len);
os_memset(rmsk, 0, sizeof(rmsk));
/* Don't use DHss in PTK derivation if PMKSA caching is not
* used. */
wpabuf_clear_free(dh_ss);
dh_ss = NULL;
if (res)
goto fail;
if (!sm->fils_erp_pmkid_set) {
wpa_printf(MSG_DEBUG, "FILS: PMKID not available");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "FILS: PMKID", sm->fils_erp_pmkid,
PMKID_LEN);
wpa_printf(MSG_DEBUG, "FILS: ERP processing succeeded - add PMKSA cache entry for the result");
sm->cur_pmksa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len,
sm->fils_erp_pmkid, NULL, 0,
sm->bssid, sm->own_addr,
sm->network_ctx, sm->key_mgmt,
NULL);
}
if (!sm->cur_pmksa) {
wpa_printf(MSG_DEBUG,
"FILS: No remaining options to continue FILS authentication");
goto fail;
}
if (fils_pmk_to_ptk(sm->pmk, sm->pmk_len, sm->own_addr, sm->bssid,
sm->fils_nonce, sm->fils_anonce,
dh_ss ? wpabuf_head(dh_ss) : NULL,
dh_ss ? wpabuf_len(dh_ss) : 0,
&sm->ptk, ick, &ick_len,
sm->key_mgmt, sm->pairwise_cipher,
sm->fils_ft, &sm->fils_ft_len) < 0) {
wpa_printf(MSG_DEBUG, "FILS: Failed to derive PTK");
goto fail;
}
wpabuf_clear_free(dh_ss);
dh_ss = NULL;
sm->ptk_set = 1;
sm->tptk_set = 0;
os_memset(&sm->tptk, 0, sizeof(sm->tptk));
#ifdef CONFIG_FILS_SK_PFS
if (sm->fils_dh_group) {
if (!sm->fils_ecdh) {
wpa_printf(MSG_INFO, "FILS: ECDH not initialized");
goto fail;
}
pub = crypto_ecdh_get_pubkey(sm->fils_ecdh, 1);
if (!pub)
goto fail;
wpa_hexdump_buf(MSG_DEBUG, "FILS: gSTA", pub);
g_sta = wpabuf_head(pub);
g_sta_len = wpabuf_len(pub);
if (!g_ap) {
wpa_printf(MSG_INFO, "FILS: gAP not available");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "FILS: gAP", g_ap, g_ap_len);
}
#endif /* CONFIG_FILS_SK_PFS */
res = fils_key_auth_sk(ick, ick_len, sm->fils_nonce,
sm->fils_anonce, sm->own_addr, sm->bssid,
g_sta, g_sta_len, g_ap, g_ap_len,
sm->key_mgmt, sm->fils_key_auth_sta,
sm->fils_key_auth_ap,
&sm->fils_key_auth_len);
wpabuf_free(pub);
os_memset(ick, 0, sizeof(ick));
return res;
fail:
wpabuf_free(pub);
wpabuf_clear_free(dh_ss);
return -1;
}
#ifdef CONFIG_IEEE80211R
static int fils_ft_build_assoc_req_rsne(struct wpa_sm *sm, struct wpabuf *buf)
{
struct rsn_ie_hdr *rsnie;
u16 capab;
u8 *pos;
/* RSNIE[PMKR0Name/PMKR1Name] */
rsnie = wpabuf_put(buf, sizeof(*rsnie));
rsnie->elem_id = WLAN_EID_RSN;
WPA_PUT_LE16(rsnie->version, RSN_VERSION);
/* Group Suite Selector */
if (!wpa_cipher_valid_group(sm->group_cipher)) {
wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
sm->group_cipher);
return -1;
}
pos = wpabuf_put(buf, RSN_SELECTOR_LEN);
RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
sm->group_cipher));
/* Pairwise Suite Count */
wpabuf_put_le16(buf, 1);
/* Pairwise Suite List */
if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
sm->pairwise_cipher);
return -1;
}
pos = wpabuf_put(buf, RSN_SELECTOR_LEN);
RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
sm->pairwise_cipher));
/* Authenticated Key Management Suite Count */
wpabuf_put_le16(buf, 1);
/* Authenticated Key Management Suite List */
pos = wpabuf_put(buf, RSN_SELECTOR_LEN);
if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
else {
wpa_printf(MSG_WARNING,
"FILS+FT: Invalid key management type (%d)",
sm->key_mgmt);
return -1;
}
/* RSN Capabilities */
capab = 0;
#ifdef CONFIG_IEEE80211W
if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
capab |= WPA_CAPABILITY_MFPC;
#endif /* CONFIG_IEEE80211W */
wpabuf_put_le16(buf, capab);
/* PMKID Count */
wpabuf_put_le16(buf, 1);
/* PMKID List [PMKR1Name] */
wpa_hexdump_key(MSG_DEBUG, "FILS+FT: XXKey (FILS-FT)",
sm->fils_ft, sm->fils_ft_len);
wpa_hexdump_ascii(MSG_DEBUG, "FILS+FT: SSID", sm->ssid, sm->ssid_len);
wpa_hexdump(MSG_DEBUG, "FILS+FT: MDID",
sm->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
wpa_hexdump_ascii(MSG_DEBUG, "FILS+FT: R0KH-ID",
sm->r0kh_id, sm->r0kh_id_len);
if (wpa_derive_pmk_r0(sm->fils_ft, sm->fils_ft_len, sm->ssid,
sm->ssid_len, sm->mobility_domain,
sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
sm->pmk_r0, sm->pmk_r0_name) < 0) {
wpa_printf(MSG_WARNING, "FILS+FT: Could not derive PMK-R0");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0", sm->pmk_r0, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR0Name",
sm->pmk_r0_name, WPA_PMK_NAME_LEN);
wpa_printf(MSG_DEBUG, "FILS+FT: R1KH-ID: " MACSTR,
MAC2STR(sm->r1kh_id));
pos = wpabuf_put(buf, WPA_PMK_NAME_LEN);
if (wpa_derive_pmk_r1_name(sm->pmk_r0_name, sm->r1kh_id, sm->own_addr,
pos) < 0) {
wpa_printf(MSG_WARNING, "FILS+FT: Could not derive PMKR1Name");
return -1;
}
wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR1Name", pos, WPA_PMK_NAME_LEN);
#ifdef CONFIG_IEEE80211W
if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
/* Management Group Cipher Suite */
pos = wpabuf_put(buf, RSN_SELECTOR_LEN);
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
}
#endif /* CONFIG_IEEE80211W */
rsnie->len = ((u8 *) wpabuf_put(buf, 0) - (u8 *) rsnie) - 2;
return 0;
}
#endif /* CONFIG_IEEE80211R */
struct wpabuf * fils_build_assoc_req(struct wpa_sm *sm, const u8 **kek,
size_t *kek_len, const u8 **snonce,
const u8 **anonce,
const struct wpabuf **hlp,
unsigned int num_hlp)
{
struct wpabuf *buf;
size_t len;
unsigned int i;
len = 1000;
#ifdef CONFIG_IEEE80211R
if (sm->fils_ft_ies)
len += wpabuf_len(sm->fils_ft_ies);
if (wpa_key_mgmt_ft(sm->key_mgmt))
len += 256;
#endif /* CONFIG_IEEE80211R */
for (i = 0; hlp && i < num_hlp; i++)
len += 10 + wpabuf_len(hlp[i]);
buf = wpabuf_alloc(len);
if (!buf)
return NULL;
#ifdef CONFIG_IEEE80211R
if (wpa_key_mgmt_ft(sm->key_mgmt) && sm->fils_ft_ies) {
/* MDE and FTE when using FILS+FT */
wpabuf_put_buf(buf, sm->fils_ft_ies);
/* RSNE with PMKR1Name in PMKID field */
if (fils_ft_build_assoc_req_rsne(sm, buf) < 0) {
wpabuf_free(buf);
return NULL;
}
}
#endif /* CONFIG_IEEE80211R */
/* FILS Session */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
wpabuf_put_u8(buf, 1 + FILS_SESSION_LEN); /* Length */
/* Element ID Extension */
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_SESSION);
wpabuf_put_data(buf, sm->fils_session, FILS_SESSION_LEN);
/* Everything after FILS Session element gets encrypted in the driver
* with KEK. The buffer returned from here is the plaintext version. */
/* TODO: FILS Public Key */
/* FILS Key Confirm */
wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
wpabuf_put_u8(buf, 1 + sm->fils_key_auth_len); /* Length */
/* Element ID Extension */
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_KEY_CONFIRM);
wpabuf_put_data(buf, sm->fils_key_auth_sta, sm->fils_key_auth_len);
/* FILS HLP Container */
for (i = 0; hlp && i < num_hlp; i++) {
const u8 *pos = wpabuf_head(hlp[i]);
size_t left = wpabuf_len(hlp[i]);
wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */
if (left <= 254)
len = 1 + left;
else
len = 255;
wpabuf_put_u8(buf, len); /* Length */
/* Element ID Extension */
wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_HLP_CONTAINER);
/* Destination MAC Address, Source MAC Address, HLP Packet.
* HLP Packet is in MSDU format (i.e., included the LLC/SNAP
* header when LPD is used). */
wpabuf_put_data(buf, pos, len - 1);
pos += len - 1;
left -= len - 1;
while (left) {
wpabuf_put_u8(buf, WLAN_EID_FRAGMENT);
len = left > 255 ? 255 : left;
wpabuf_put_u8(buf, len);
wpabuf_put_data(buf, pos, len);
pos += len;
left -= len;
}
}
/* TODO: FILS IP Address Assignment */
wpa_hexdump_buf(MSG_DEBUG, "FILS: Association Request plaintext", buf);
*kek = sm->ptk.kek;
*kek_len = sm->ptk.kek_len;
wpa_hexdump_key(MSG_DEBUG, "FILS: KEK for AEAD", *kek, *kek_len);
*snonce = sm->fils_nonce;
wpa_hexdump(MSG_DEBUG, "FILS: SNonce for AEAD AAD",
*snonce, FILS_NONCE_LEN);
*anonce = sm->fils_anonce;
wpa_hexdump(MSG_DEBUG, "FILS: ANonce for AEAD AAD",
*anonce, FILS_NONCE_LEN);
return buf;
}
static void fils_process_hlp_resp(struct wpa_sm *sm, const u8 *resp, size_t len)
{
const u8 *pos, *end;
wpa_hexdump(MSG_MSGDUMP, "FILS: HLP response", resp, len);
if (len < 2 * ETH_ALEN)
return;
pos = resp + 2 * ETH_ALEN;
end = resp + len;
if (end - pos >= 6 &&
os_memcmp(pos, "\xaa\xaa\x03\x00\x00\x00", 6) == 0)
pos += 6; /* Remove SNAP/LLC header */
wpa_sm_fils_hlp_rx(sm, resp, resp + ETH_ALEN, pos, end - pos);
}
static void fils_process_hlp_container(struct wpa_sm *sm, const u8 *pos,
size_t len)
{
const u8 *end = pos + len;
u8 *tmp, *tmp_pos;
/* Check if there are any FILS HLP Container elements */
while (end - pos >= 2) {
if (2 + pos[1] > end - pos)
return;
if (pos[0] == WLAN_EID_EXTENSION &&
pos[1] >= 1 + 2 * ETH_ALEN &&
pos[2] == WLAN_EID_EXT_FILS_HLP_CONTAINER)
break;
pos += 2 + pos[1];
}
if (end - pos < 2)
return; /* No FILS HLP Container elements */
tmp = os_malloc(end - pos);
if (!tmp)
return;
while (end - pos >= 2) {
if (2 + pos[1] > end - pos ||
pos[0] != WLAN_EID_EXTENSION ||
pos[1] < 1 + 2 * ETH_ALEN ||
pos[2] != WLAN_EID_EXT_FILS_HLP_CONTAINER)
break;
tmp_pos = tmp;
os_memcpy(tmp_pos, pos + 3, pos[1] - 1);
tmp_pos += pos[1] - 1;
pos += 2 + pos[1];
/* Add possible fragments */
while (end - pos >= 2 && pos[0] == WLAN_EID_FRAGMENT &&
2 + pos[1] <= end - pos) {
os_memcpy(tmp_pos, pos + 2, pos[1]);
tmp_pos += pos[1];
pos += 2 + pos[1];
}
fils_process_hlp_resp(sm, tmp, tmp_pos - tmp);
}
os_free(tmp);
}
int fils_process_assoc_resp(struct wpa_sm *sm, const u8 *resp, size_t len)
{
const struct ieee80211_mgmt *mgmt;
const u8 *end, *ie_start;
struct ieee802_11_elems elems;
int keylen, rsclen;
enum wpa_alg alg;
struct wpa_gtk_data gd;
int maxkeylen;
struct wpa_eapol_ie_parse kde;
if (!sm || !sm->ptk_set) {
wpa_printf(MSG_DEBUG, "FILS: No KEK available");
return -1;
}
if (!wpa_key_mgmt_fils(sm->key_mgmt)) {
wpa_printf(MSG_DEBUG, "FILS: Not a FILS AKM");
return -1;
}
if (sm->fils_completed) {
wpa_printf(MSG_DEBUG,
"FILS: Association has already been completed for this FILS authentication - ignore unexpected retransmission");
return -1;
}
wpa_hexdump(MSG_DEBUG, "FILS: (Re)Association Response frame",
resp, len);
mgmt = (const struct ieee80211_mgmt *) resp;
if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_resp))
return -1;
end = resp + len;
/* Same offset for Association Response and Reassociation Response */
ie_start = mgmt->u.assoc_resp.variable;
if (ieee802_11_parse_elems(ie_start, end - ie_start, &elems, 1) ==
ParseFailed) {
wpa_printf(MSG_DEBUG,
"FILS: Failed to parse decrypted elements");
goto fail;
}
if (!elems.fils_session) {
wpa_printf(MSG_DEBUG, "FILS: No FILS Session element");
return -1;
}
if (os_memcmp(elems.fils_session, sm->fils_session,
FILS_SESSION_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FILS: FILS Session mismatch");
wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
elems.fils_session, FILS_SESSION_LEN);
wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
sm->fils_session, FILS_SESSION_LEN);
}
/* TODO: FILS Public Key */
if (!elems.fils_key_confirm) {
wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
goto fail;
}
if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
wpa_printf(MSG_DEBUG,
"FILS: Unexpected Key-Auth length %d (expected %d)",
elems.fils_key_confirm_len,
(int) sm->fils_key_auth_len);
goto fail;
}
if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_ap,
sm->fils_key_auth_len) != 0) {
wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
elems.fils_key_confirm,
elems.fils_key_confirm_len);
wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
sm->fils_key_auth_ap, sm->fils_key_auth_len);
goto fail;
}
/* Key Delivery */
if (!elems.key_delivery) {
wpa_printf(MSG_DEBUG, "FILS: No Key Delivery element");
goto fail;
}
/* Parse GTK and set the key to the driver */
os_memset(&gd, 0, sizeof(gd));
if (wpa_supplicant_parse_ies(elems.key_delivery + WPA_KEY_RSC_LEN,
elems.key_delivery_len - WPA_KEY_RSC_LEN,
&kde) < 0) {
wpa_printf(MSG_DEBUG, "FILS: Failed to parse KDEs");
goto fail;
}
if (!kde.gtk) {
wpa_printf(MSG_DEBUG, "FILS: No GTK KDE");
goto fail;
}
maxkeylen = gd.gtk_len = kde.gtk_len - 2;
if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
gd.gtk_len, maxkeylen,
&gd.key_rsc_len, &gd.alg))
goto fail;
wpa_hexdump_key(MSG_DEBUG, "FILS: Received GTK", kde.gtk, kde.gtk_len);
gd.keyidx = kde.gtk[0] & 0x3;
gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
!!(kde.gtk[0] & BIT(2)));
if (kde.gtk_len - 2 > sizeof(gd.gtk)) {
wpa_printf(MSG_DEBUG, "FILS: Too long GTK in GTK KDE (len=%lu)",
(unsigned long) kde.gtk_len - 2);
goto fail;
}
os_memcpy(gd.gtk, kde.gtk + 2, kde.gtk_len - 2);
wpa_printf(MSG_DEBUG, "FILS: Set GTK to driver");
if (wpa_supplicant_install_gtk(sm, &gd, elems.key_delivery, 0) < 0) {
wpa_printf(MSG_DEBUG, "FILS: Failed to set GTK");
goto fail;
}
if (ieee80211w_set_keys(sm, &kde) < 0) {
wpa_printf(MSG_DEBUG, "FILS: Failed to set IGTK");
goto fail;
}
alg = wpa_cipher_to_alg(sm->pairwise_cipher);
keylen = wpa_cipher_key_len(sm->pairwise_cipher);
if (keylen <= 0 || (unsigned int) keylen != sm->ptk.tk_len) {
wpa_printf(MSG_DEBUG, "FILS: TK length mismatch: %u != %lu",
keylen, (long unsigned int) sm->ptk.tk_len);
goto fail;
}
rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher);
wpa_hexdump_key(MSG_DEBUG, "FILS: Set TK to driver",
sm->ptk.tk, keylen);
if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, null_rsc, rsclen,
sm->ptk.tk, keylen) < 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"FILS: Failed to set PTK to the driver (alg=%d keylen=%d bssid="
MACSTR ")",
alg, keylen, MAC2STR(sm->bssid));
goto fail;
}
/* TODO: TK could be cleared after auth frame exchange now that driver
* takes care of association frame encryption/decryption. */
/* TK is not needed anymore in supplicant */
os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN);
sm->ptk.tk_len = 0;
sm->ptk.installed = 1;
/* FILS HLP Container */
fils_process_hlp_container(sm, ie_start, end - ie_start);
/* TODO: FILS IP Address Assignment */
wpa_printf(MSG_DEBUG, "FILS: Auth+Assoc completed successfully");
sm->fils_completed = 1;
return 0;
fail:
return -1;
}
void wpa_sm_set_reset_fils_completed(struct wpa_sm *sm, int set)
{
if (sm)
sm->fils_completed = !!set;
}
#endif /* CONFIG_FILS */
int wpa_fils_is_completed(struct wpa_sm *sm)
{
#ifdef CONFIG_FILS
return sm && sm->fils_completed;
#else /* CONFIG_FILS */
return 0;
#endif /* CONFIG_FILS */
}
#ifdef CONFIG_OWE
struct wpabuf * owe_build_assoc_req(struct wpa_sm *sm, u16 group)
{
struct wpabuf *ie = NULL, *pub = NULL;
size_t prime_len;
if (group == 19)
prime_len = 32;
else if (group == 20)
prime_len = 48;
else if (group == 21)
prime_len = 66;
else
return NULL;
crypto_ecdh_deinit(sm->owe_ecdh);
sm->owe_ecdh = crypto_ecdh_init(group);
if (!sm->owe_ecdh)
goto fail;
sm->owe_group = group;
pub = crypto_ecdh_get_pubkey(sm->owe_ecdh, 0);
pub = wpabuf_zeropad(pub, prime_len);
if (!pub)
goto fail;
ie = wpabuf_alloc(5 + wpabuf_len(pub));
if (!ie)
goto fail;
wpabuf_put_u8(ie, WLAN_EID_EXTENSION);
wpabuf_put_u8(ie, 1 + 2 + wpabuf_len(pub));
wpabuf_put_u8(ie, WLAN_EID_EXT_OWE_DH_PARAM);
wpabuf_put_le16(ie, group);
wpabuf_put_buf(ie, pub);
wpabuf_free(pub);
wpa_hexdump_buf(MSG_DEBUG, "OWE: Diffie-Hellman Parameter element",
ie);
return ie;
fail:
wpabuf_free(pub);
crypto_ecdh_deinit(sm->owe_ecdh);
sm->owe_ecdh = NULL;
return NULL;
}
int owe_process_assoc_resp(struct wpa_sm *sm, const u8 *bssid,
const u8 *resp_ies, size_t resp_ies_len)
{
struct ieee802_11_elems elems;
u16 group;
struct wpabuf *secret, *pub, *hkey;
int res;
u8 prk[SHA512_MAC_LEN], pmkid[SHA512_MAC_LEN];
const char *info = "OWE Key Generation";
const u8 *addr[2];
size_t len[2];
size_t hash_len, prime_len;
struct wpa_ie_data data;
if (!resp_ies ||
ieee802_11_parse_elems(resp_ies, resp_ies_len, &elems, 1) ==
ParseFailed) {
wpa_printf(MSG_INFO,
"OWE: Could not parse Association Response frame elements");
return -1;
}
if (sm->cur_pmksa && elems.rsn_ie &&
wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2, 2 + elems.rsn_ie_len,
&data) == 0 &&
data.num_pmkid == 1 && data.pmkid &&
os_memcmp(sm->cur_pmksa->pmkid, data.pmkid, PMKID_LEN) == 0) {
wpa_printf(MSG_DEBUG, "OWE: Use PMKSA caching");
wpa_sm_set_pmk_from_pmksa(sm);
return 0;
}
if (!elems.owe_dh) {
wpa_printf(MSG_INFO,
"OWE: No Diffie-Hellman Parameter element found in Association Response frame");
return -1;
}
group = WPA_GET_LE16(elems.owe_dh);
if (group != sm->owe_group) {
wpa_printf(MSG_INFO,
"OWE: Unexpected Diffie-Hellman group in response: %u",
group);
return -1;
}
if (!sm->owe_ecdh) {
wpa_printf(MSG_INFO, "OWE: No ECDH state available");
return -1;
}
if (group == 19)
prime_len = 32;
else if (group == 20)
prime_len = 48;
else if (group == 21)
prime_len = 66;
else
return -1;
secret = crypto_ecdh_set_peerkey(sm->owe_ecdh, 0,
elems.owe_dh + 2,
elems.owe_dh_len - 2);
secret = wpabuf_zeropad(secret, prime_len);
if (!secret) {
wpa_printf(MSG_DEBUG, "OWE: Invalid peer DH public key");
return -1;
}
wpa_hexdump_buf_key(MSG_DEBUG, "OWE: DH shared secret", secret);
/* prk = HKDF-extract(C | A | group, z) */
pub = crypto_ecdh_get_pubkey(sm->owe_ecdh, 0);
if (!pub) {
wpabuf_clear_free(secret);
return -1;
}
/* PMKID = Truncate-128(Hash(C | A)) */
addr[0] = wpabuf_head(pub);
len[0] = wpabuf_len(pub);
addr[1] = elems.owe_dh + 2;
len[1] = elems.owe_dh_len - 2;
if (group == 19) {
res = sha256_vector(2, addr, len, pmkid);
hash_len = SHA256_MAC_LEN;
} else if (group == 20) {
res = sha384_vector(2, addr, len, pmkid);
hash_len = SHA384_MAC_LEN;
} else if (group == 21) {
res = sha512_vector(2, addr, len, pmkid);
hash_len = SHA512_MAC_LEN;
} else {
res = -1;
hash_len = 0;
}
pub = wpabuf_zeropad(pub, prime_len);
if (res < 0 || !pub) {
wpabuf_free(pub);
wpabuf_clear_free(secret);
return -1;
}
hkey = wpabuf_alloc(wpabuf_len(pub) + elems.owe_dh_len - 2 + 2);
if (!hkey) {
wpabuf_free(pub);
wpabuf_clear_free(secret);
return -1;
}
wpabuf_put_buf(hkey, pub); /* C */
wpabuf_free(pub);
wpabuf_put_data(hkey, elems.owe_dh + 2, elems.owe_dh_len - 2); /* A */
wpabuf_put_le16(hkey, sm->owe_group); /* group */
if (group == 19)
res = hmac_sha256(wpabuf_head(hkey), wpabuf_len(hkey),
wpabuf_head(secret), wpabuf_len(secret), prk);
else if (group == 20)
res = hmac_sha384(wpabuf_head(hkey), wpabuf_len(hkey),
wpabuf_head(secret), wpabuf_len(secret), prk);
else if (group == 21)
res = hmac_sha512(wpabuf_head(hkey), wpabuf_len(hkey),
wpabuf_head(secret), wpabuf_len(secret), prk);
wpabuf_clear_free(hkey);
wpabuf_clear_free(secret);
if (res < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "OWE: prk", prk, hash_len);
/* PMK = HKDF-expand(prk, "OWE Key Generation", n) */
if (group == 19)
res = hmac_sha256_kdf(prk, hash_len, NULL, (const u8 *) info,
os_strlen(info), sm->pmk, hash_len);
else if (group == 20)
res = hmac_sha384_kdf(prk, hash_len, NULL, (const u8 *) info,
os_strlen(info), sm->pmk, hash_len);
else if (group == 21)
res = hmac_sha512_kdf(prk, hash_len, NULL, (const u8 *) info,
os_strlen(info), sm->pmk, hash_len);
os_memset(prk, 0, SHA512_MAC_LEN);
if (res < 0) {
sm->pmk_len = 0;
return -1;
}
sm->pmk_len = hash_len;
wpa_hexdump_key(MSG_DEBUG, "OWE: PMK", sm->pmk, sm->pmk_len);
wpa_hexdump(MSG_DEBUG, "OWE: PMKID", pmkid, PMKID_LEN);
pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, pmkid, NULL, 0,
bssid, sm->own_addr, sm->network_ctx, sm->key_mgmt,
NULL);
return 0;
}
#endif /* CONFIG_OWE */
void wpa_sm_set_fils_cache_id(struct wpa_sm *sm, const u8 *fils_cache_id)
{
#ifdef CONFIG_FILS
if (sm && fils_cache_id) {
sm->fils_cache_id_set = 1;
os_memcpy(sm->fils_cache_id, fils_cache_id, FILS_CACHE_ID_LEN);
}
#endif /* CONFIG_FILS */
}
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