/*
* hostapd - IEEE 802.11r - Fast BSS Transition
* Copyright (c) 2004-2018, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/eloop.h"
#include "utils/list.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/ocv.h"
#include "drivers/driver.h"
#include "crypto/aes.h"
#include "crypto/aes_siv.h"
#include "crypto/aes_wrap.h"
#include "crypto/sha384.h"
#include "crypto/random.h"
#include "ap_config.h"
#include "ieee802_11.h"
#include "wmm.h"
#include "wpa_auth.h"
#include "wpa_auth_i.h"
#ifdef CONFIG_IEEE80211R_AP
const unsigned int ftRRBseqTimeout = 10;
const unsigned int ftRRBmaxQueueLen = 100;
static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
const u8 *current_ap, const u8 *sta_addr,
u16 status, const u8 *resp_ies,
size_t resp_ies_len);
static void ft_finish_pull(struct wpa_state_machine *sm);
static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx);
static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx);
struct tlv_list {
u16 type;
size_t len;
const u8 *data;
};
/**
* wpa_ft_rrb_decrypt - Decrypt FT RRB message
* @key: AES-SIV key for AEAD
* @key_len: Length of key in octets
* @enc: Pointer to encrypted TLVs
* @enc_len: Length of encrypted TLVs in octets
* @auth: Pointer to authenticated TLVs
* @auth_len: Length of authenticated TLVs in octets
* @src_addr: MAC address of the frame sender
* @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
* @plain: Pointer to return the pointer to the allocated plaintext buffer;
* needs to be freed by the caller if not NULL;
* will only be returned on success
* @plain_len: Pointer to return the length of the allocated plaintext buffer
* in octets
* Returns: 0 on success, -1 on error
*/
static int wpa_ft_rrb_decrypt(const u8 *key, const size_t key_len,
const u8 *enc, size_t enc_len,
const u8 *auth, const size_t auth_len,
const u8 *src_addr, u8 type,
u8 **plain, size_t *plain_size)
{
const u8 *ad[3] = { src_addr, auth, &type };
size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
MAC2STR(src_addr), type);
wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypt using key", key, key_len);
wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs", enc, enc_len);
wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);
if (!key) { /* skip decryption */
*plain = os_memdup(enc, enc_len);
if (enc_len > 0 && !*plain)
goto err;
*plain_size = enc_len;
return 0;
}
*plain = NULL;
/* SIV overhead */
if (enc_len < AES_BLOCK_SIZE)
goto err;
*plain = os_zalloc(enc_len - AES_BLOCK_SIZE);
if (!*plain)
goto err;
if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
*plain) < 0) {
if (enc_len < AES_BLOCK_SIZE + 2)
goto err;
/* Try to work around Ethernet devices that add extra
* two octet padding even if the frame is longer than
* the minimum Ethernet frame. */
enc_len -= 2;
if (aes_siv_decrypt(key, key_len, enc, enc_len, 3, ad, ad_len,
*plain) < 0)
goto err;
}
*plain_size = enc_len - AES_BLOCK_SIZE;
wpa_hexdump_key(MSG_DEBUG, "FT(RRB): decrypted TLVs",
*plain, *plain_size);
return 0;
err:
os_free(*plain);
*plain = NULL;
*plain_size = 0;
wpa_printf(MSG_ERROR, "FT(RRB): Failed to decrypt");
return -1;
}
/* get first tlv record in packet matching type
* @data (decrypted) packet
* @return 0 on success else -1
*/
static int wpa_ft_rrb_get_tlv(const u8 *plain, size_t plain_len,
u16 type, size_t *tlv_len, const u8 **tlv_data)
{
const struct ft_rrb_tlv *f;
size_t left;
le16 type16;
size_t len;
left = plain_len;
type16 = host_to_le16(type);
while (left >= sizeof(*f)) {
f = (const struct ft_rrb_tlv *) plain;
left -= sizeof(*f);
plain += sizeof(*f);
len = le_to_host16(f->len);
if (left < len) {
wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
break;
}
if (f->type == type16) {
*tlv_len = len;
*tlv_data = plain;
return 0;
}
left -= len;
plain += len;
}
return -1;
}
static void wpa_ft_rrb_dump(const u8 *plain, const size_t plain_len)
{
const struct ft_rrb_tlv *f;
size_t left;
size_t len;
left = plain_len;
wpa_printf(MSG_DEBUG, "FT: RRB dump message");
while (left >= sizeof(*f)) {
f = (const struct ft_rrb_tlv *) plain;
left -= sizeof(*f);
plain += sizeof(*f);
len = le_to_host16(f->len);
wpa_printf(MSG_DEBUG, "FT: RRB TLV type = %d, len = %zu",
le_to_host16(f->type), len);
if (left < len) {
wpa_printf(MSG_DEBUG,
"FT: RRB message truncated: left %zu bytes, need %zu",
left, len);
break;
}
wpa_hexdump(MSG_DEBUG, "FT: RRB TLV data", plain, len);
left -= len;
plain += len;
}
if (left > 0)
wpa_hexdump(MSG_DEBUG, "FT: RRB TLV padding", plain, left);
wpa_printf(MSG_DEBUG, "FT: RRB dump message end");
}
static int cmp_int(const void *a, const void *b)
{
int x, y;
x = *((int *) a);
y = *((int *) b);
return x - y;
}
static int wpa_ft_rrb_get_tlv_vlan(const u8 *plain, const size_t plain_len,
struct vlan_description *vlan)
{
struct ft_rrb_tlv *f;
size_t left;
size_t len;
int taggedidx;
int vlan_id;
int type;
left = plain_len;
taggedidx = 0;
os_memset(vlan, 0, sizeof(*vlan));
while (left >= sizeof(*f)) {
f = (struct ft_rrb_tlv *) plain;
left -= sizeof(*f);
plain += sizeof(*f);
len = le_to_host16(f->len);
type = le_to_host16(f->type);
if (left < len) {
wpa_printf(MSG_DEBUG, "FT: RRB message truncated");
return -1;
}
if (type != FT_RRB_VLAN_UNTAGGED && type != FT_RRB_VLAN_TAGGED)
goto skip;
if (type == FT_RRB_VLAN_UNTAGGED && len != sizeof(le16)) {
wpa_printf(MSG_DEBUG,
"FT: RRB VLAN_UNTAGGED invalid length");
return -1;
}
if (type == FT_RRB_VLAN_TAGGED && len % sizeof(le16) != 0) {
wpa_printf(MSG_DEBUG,
"FT: RRB VLAN_TAGGED invalid length");
return -1;
}
while (len >= sizeof(le16)) {
vlan_id = WPA_GET_LE16(plain);
plain += sizeof(le16);
left -= sizeof(le16);
len -= sizeof(le16);
if (vlan_id <= 0 || vlan_id > MAX_VLAN_ID) {
wpa_printf(MSG_DEBUG,
"FT: RRB VLAN ID invalid %d",
vlan_id);
continue;
}
if (type == FT_RRB_VLAN_UNTAGGED)
vlan->untagged = vlan_id;
if (type == FT_RRB_VLAN_TAGGED &&
taggedidx < MAX_NUM_TAGGED_VLAN) {
vlan->tagged[taggedidx] = vlan_id;
taggedidx++;
} else if (type == FT_RRB_VLAN_TAGGED) {
wpa_printf(MSG_DEBUG, "FT: RRB too many VLANs");
}
}
skip:
left -= len;
plain += len;
}
if (taggedidx)
qsort(vlan->tagged, taggedidx, sizeof(int), cmp_int);
vlan->notempty = vlan->untagged || vlan->tagged[0];
return 0;
}
static size_t wpa_ft_tlv_len(const struct tlv_list *tlvs)
{
size_t tlv_len = 0;
int i;
if (!tlvs)
return 0;
for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
tlv_len += sizeof(struct ft_rrb_tlv);
tlv_len += tlvs[i].len;
}
return tlv_len;
}
static size_t wpa_ft_tlv_lin(const struct tlv_list *tlvs, u8 *start,
u8 *endpos)
{
int i;
size_t tlv_len;
struct ft_rrb_tlv *hdr;
u8 *pos;
if (!tlvs)
return 0;
tlv_len = 0;
pos = start;
for (i = 0; tlvs[i].type != FT_RRB_LAST_EMPTY; i++) {
if (tlv_len + sizeof(*hdr) > (size_t) (endpos - start))
return tlv_len;
tlv_len += sizeof(*hdr);
hdr = (struct ft_rrb_tlv *) pos;
hdr->type = host_to_le16(tlvs[i].type);
hdr->len = host_to_le16(tlvs[i].len);
pos = start + tlv_len;
if (tlv_len + tlvs[i].len > (size_t) (endpos - start))
return tlv_len;
if (tlvs[i].len == 0)
continue;
tlv_len += tlvs[i].len;
os_memcpy(pos, tlvs[i].data, tlvs[i].len);
pos = start + tlv_len;
}
return tlv_len;
}
static size_t wpa_ft_vlan_len(const struct vlan_description *vlan)
{
size_t tlv_len = 0;
int i;
if (!vlan || !vlan->notempty)
return 0;
if (vlan->untagged) {
tlv_len += sizeof(struct ft_rrb_tlv);
tlv_len += sizeof(le16);
}
if (vlan->tagged[0])
tlv_len += sizeof(struct ft_rrb_tlv);
for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++)
tlv_len += sizeof(le16);
return tlv_len;
}
static size_t wpa_ft_vlan_lin(const struct vlan_description *vlan,
u8 *start, u8 *endpos)
{
size_t tlv_len;
int i, len;
struct ft_rrb_tlv *hdr;
u8 *pos = start;
if (!vlan || !vlan->notempty)
return 0;
tlv_len = 0;
if (vlan->untagged) {
tlv_len += sizeof(*hdr);
if (start + tlv_len > endpos)
return tlv_len;
hdr = (struct ft_rrb_tlv *) pos;
hdr->type = host_to_le16(FT_RRB_VLAN_UNTAGGED);
hdr->len = host_to_le16(sizeof(le16));
pos = start + tlv_len;
tlv_len += sizeof(le16);
if (start + tlv_len > endpos)
return tlv_len;
WPA_PUT_LE16(pos, vlan->untagged);
pos = start + tlv_len;
}
if (!vlan->tagged[0])
return tlv_len;
tlv_len += sizeof(*hdr);
if (start + tlv_len > endpos)
return tlv_len;
hdr = (struct ft_rrb_tlv *) pos;
hdr->type = host_to_le16(FT_RRB_VLAN_TAGGED);
len = 0; /* len is computed below */
pos = start + tlv_len;
for (i = 0; i < MAX_NUM_TAGGED_VLAN && vlan->tagged[i]; i++) {
tlv_len += sizeof(le16);
if (start + tlv_len > endpos)
break;
len += sizeof(le16);
WPA_PUT_LE16(pos, vlan->tagged[i]);
pos = start + tlv_len;
}
hdr->len = host_to_le16(len);
return tlv_len;
}
static int wpa_ft_rrb_lin(const struct tlv_list *tlvs1,
const struct tlv_list *tlvs2,
const struct vlan_description *vlan,
u8 **plain, size_t *plain_len)
{
u8 *pos, *endpos;
size_t tlv_len;
tlv_len = wpa_ft_tlv_len(tlvs1);
tlv_len += wpa_ft_tlv_len(tlvs2);
tlv_len += wpa_ft_vlan_len(vlan);
*plain_len = tlv_len;
*plain = os_zalloc(tlv_len);
if (!*plain) {
wpa_printf(MSG_ERROR, "FT: Failed to allocate plaintext");
goto err;
}
pos = *plain;
endpos = *plain + tlv_len;
pos += wpa_ft_tlv_lin(tlvs1, pos, endpos);
pos += wpa_ft_tlv_lin(tlvs2, pos, endpos);
pos += wpa_ft_vlan_lin(vlan, pos, endpos);
/* sanity check */
if (pos != endpos) {
wpa_printf(MSG_ERROR, "FT: Length error building RRB");
goto err;
}
return 0;
err:
os_free(*plain);
*plain = NULL;
*plain_len = 0;
return -1;
}
static int wpa_ft_rrb_encrypt(const u8 *key, const size_t key_len,
const u8 *plain, const size_t plain_len,
const u8 *auth, const size_t auth_len,
const u8 *src_addr, u8 type, u8 *enc)
{
const u8 *ad[3] = { src_addr, auth, &type };
size_t ad_len[3] = { ETH_ALEN, auth_len, sizeof(type) };
wpa_printf(MSG_DEBUG, "FT(RRB): src_addr=" MACSTR " type=%u",
MAC2STR(src_addr), type);
wpa_hexdump_key(MSG_DEBUG, "FT(RRB): plaintext message",
plain, plain_len);
wpa_hexdump_key(MSG_DEBUG, "FT(RRB): encrypt using key", key, key_len);
wpa_hexdump(MSG_DEBUG, "FT(RRB): authenticated TLVs", auth, auth_len);
if (!key) {
/* encryption not needed, return plaintext as packet */
os_memcpy(enc, plain, plain_len);
} else if (aes_siv_encrypt(key, key_len, plain, plain_len,
3, ad, ad_len, enc) < 0) {
wpa_printf(MSG_ERROR, "FT: Failed to encrypt RRB-OUI message");
return -1;
}
wpa_hexdump(MSG_DEBUG, "FT(RRB): encrypted TLVs",
enc, plain_len + AES_BLOCK_SIZE);
return 0;
}
/**
* wpa_ft_rrb_build - Build and encrypt an FT RRB message
* @key: AES-SIV key for AEAD
* @key_len: Length of key in octets
* @tlvs_enc0: First set of to-be-encrypted TLVs
* @tlvs_enc1: Second set of to-be-encrypted TLVs
* @tlvs_auth: Set of to-be-authenticated TLVs
* @src_addr: MAC address of the frame sender
* @type: Vendor-specific subtype of the RRB frame (FT_PACKET_*)
* @packet Pointer to return the pointer to the allocated packet buffer;
* needs to be freed by the caller if not null;
* will only be returned on success
* @packet_len: Pointer to return the length of the allocated buffer in octets
* Returns: 0 on success, -1 on error
*/
static int wpa_ft_rrb_build(const u8 *key, const size_t key_len,
const struct tlv_list *tlvs_enc0,
const struct tlv_list *tlvs_enc1,
const struct tlv_list *tlvs_auth,
const struct vlan_description *vlan,
const u8 *src_addr, u8 type,
u8 **packet, size_t *packet_len)
{
u8 *plain = NULL, *auth = NULL, *pos, *tmp;
size_t plain_len = 0, auth_len = 0;
int ret = -1;
size_t pad_len = 0;
*packet = NULL;
if (wpa_ft_rrb_lin(tlvs_enc0, tlvs_enc1, vlan, &plain, &plain_len) < 0)
goto out;
if (wpa_ft_rrb_lin(tlvs_auth, NULL, NULL, &auth, &auth_len) < 0)
goto out;
*packet_len = sizeof(u16) + auth_len + plain_len;
if (key)
*packet_len += AES_BLOCK_SIZE;
#define RRB_MIN_MSG_LEN 64
if (*packet_len < RRB_MIN_MSG_LEN) {
pad_len = RRB_MIN_MSG_LEN - *packet_len;
if (pad_len < sizeof(struct ft_rrb_tlv))
pad_len = sizeof(struct ft_rrb_tlv);
wpa_printf(MSG_DEBUG,
"FT: Pad message to minimum Ethernet frame length (%d --> %d)",
(int) *packet_len, (int) (*packet_len + pad_len));
*packet_len += pad_len;
tmp = os_realloc(auth, auth_len + pad_len);
if (!tmp)
goto out;
auth = tmp;
pos = auth + auth_len;
WPA_PUT_LE16(pos, FT_RRB_LAST_EMPTY);
pos += 2;
WPA_PUT_LE16(pos, pad_len - sizeof(struct ft_rrb_tlv));
pos += 2;
os_memset(pos, 0, pad_len - sizeof(struct ft_rrb_tlv));
auth_len += pad_len;
}
*packet = os_zalloc(*packet_len);
if (!*packet)
goto out;
pos = *packet;
WPA_PUT_LE16(pos, auth_len);
pos += 2;
os_memcpy(pos, auth, auth_len);
pos += auth_len;
if (wpa_ft_rrb_encrypt(key, key_len, plain, plain_len, auth,
auth_len, src_addr, type, pos) < 0)
goto out;
wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", *packet, *packet_len);
ret = 0;
out:
bin_clear_free(plain, plain_len);
os_free(auth);
if (ret) {
wpa_printf(MSG_ERROR, "FT: Failed to build RRB-OUI message");
os_free(*packet);
*packet = NULL;
*packet_len = 0;
}
return ret;
}
#define RRB_GET_SRC(srcfield, type, field, txt, checklength) do { \
if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
&f_##field##_len, &f_##field) < 0 || \
(checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
wpa_printf(MSG_INFO, "FT: Missing required " #field \
" in %s from " MACSTR, txt, MAC2STR(src_addr)); \
wpa_ft_rrb_dump(srcfield, srcfield##_len); \
goto out; \
} \
} while (0)
#define RRB_GET(type, field, txt, checklength) \
RRB_GET_SRC(plain, type, field, txt, checklength)
#define RRB_GET_AUTH(type, field, txt, checklength) \
RRB_GET_SRC(auth, type, field, txt, checklength)
#define RRB_GET_OPTIONAL_SRC(srcfield, type, field, txt, checklength) do { \
if (wpa_ft_rrb_get_tlv(srcfield, srcfield##_len, type, \
&f_##field##_len, &f_##field) < 0 || \
(checklength > 0 && ((size_t) checklength) != f_##field##_len)) { \
wpa_printf(MSG_DEBUG, "FT: Missing optional " #field \
" in %s from " MACSTR, txt, MAC2STR(src_addr)); \
f_##field##_len = 0; \
f_##field = NULL; \
} \
} while (0)
#define RRB_GET_OPTIONAL(type, field, txt, checklength) \
RRB_GET_OPTIONAL_SRC(plain, type, field, txt, checklength)
#define RRB_GET_OPTIONAL_AUTH(type, field, txt, checklength) \
RRB_GET_OPTIONAL_SRC(auth, type, field, txt, checklength)
static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
const u8 *data, size_t data_len)
{
if (wpa_auth->cb->send_ether == NULL)
return -1;
wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
data, data_len);
}
static int wpa_ft_rrb_oui_send(struct wpa_authenticator *wpa_auth,
const u8 *dst, u8 oui_suffix,
const u8 *data, size_t data_len)
{
if (!wpa_auth->cb->send_oui)
return -1;
wpa_printf(MSG_DEBUG, "FT: RRB-OUI type %u send to " MACSTR " (len=%u)",
oui_suffix, MAC2STR(dst), (unsigned int) data_len);
return wpa_auth->cb->send_oui(wpa_auth->cb_ctx, dst, oui_suffix, data,
data_len);
}
static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
const u8 *dst, const u8 *data, size_t data_len)
{
if (wpa_auth->cb->send_ft_action == NULL)
return -1;
return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
data, data_len);
}
static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
const u8 *addr, const u8 *p2p_dev_addr,
const u8 *prev_psk)
{
if (wpa_auth->cb->get_psk == NULL)
return NULL;
return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
prev_psk, NULL, NULL);
}
static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
{
if (wpa_auth->cb->add_sta == NULL)
return NULL;
return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
}
static int wpa_ft_set_vlan(struct wpa_authenticator *wpa_auth,
const u8 *sta_addr, struct vlan_description *vlan)
{
if (!wpa_auth->cb->set_vlan)
return -1;
return wpa_auth->cb->set_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
}
static int wpa_ft_get_vlan(struct wpa_authenticator *wpa_auth,
const u8 *sta_addr, struct vlan_description *vlan)
{
if (!wpa_auth->cb->get_vlan)
return -1;
return wpa_auth->cb->get_vlan(wpa_auth->cb_ctx, sta_addr, vlan);
}
static int
wpa_ft_set_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
const u8 *identity, size_t identity_len)
{
if (!wpa_auth->cb->set_identity)
return -1;
return wpa_auth->cb->set_identity(wpa_auth->cb_ctx, sta_addr, identity,
identity_len);
}
static size_t
wpa_ft_get_identity(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
const u8 **buf)
{
*buf = NULL;
if (!wpa_auth->cb->get_identity)
return 0;
return wpa_auth->cb->get_identity(wpa_auth->cb_ctx, sta_addr, buf);
}
static int
wpa_ft_set_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
const u8 *radius_cui, size_t radius_cui_len)
{
if (!wpa_auth->cb->set_radius_cui)
return -1;
return wpa_auth->cb->set_radius_cui(wpa_auth->cb_ctx, sta_addr,
radius_cui, radius_cui_len);
}
static size_t
wpa_ft_get_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
const u8 **buf)
{
*buf = NULL;
if (!wpa_auth->cb->get_radius_cui)
return 0;
return wpa_auth->cb->get_radius_cui(wpa_auth->cb_ctx, sta_addr, buf);
}
static void
wpa_ft_set_session_timeout(struct wpa_authenticator *wpa_auth,
const u8 *sta_addr, int session_timeout)
{
if (!wpa_auth->cb->set_session_timeout)
return;
wpa_auth->cb->set_session_timeout(wpa_auth->cb_ctx, sta_addr,
session_timeout);
}
static int
wpa_ft_get_session_timeout(struct wpa_authenticator *wpa_auth,
const u8 *sta_addr)
{
if (!wpa_auth->cb->get_session_timeout)
return 0;
return wpa_auth->cb->get_session_timeout(wpa_auth->cb_ctx, sta_addr);
}
static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
const u8 *sta_addr,
u8 *tspec_ie, size_t tspec_ielen)
{
if (wpa_auth->cb->add_tspec == NULL) {
wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
return -1;
}
return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
tspec_ielen);
}
#ifdef CONFIG_OCV
static int wpa_channel_info(struct wpa_authenticator *wpa_auth,
struct wpa_channel_info *ci)
{
if (!wpa_auth->cb->channel_info)
return -1;
return wpa_auth->cb->channel_info(wpa_auth->cb_ctx, ci);
}
#endif /* CONFIG_OCV */
int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
{
u8 *pos = buf;
u8 capab;
if (len < 2 + sizeof(struct rsn_mdie))
return -1;
*pos++ = WLAN_EID_MOBILITY_DOMAIN;
*pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
pos += MOBILITY_DOMAIN_ID_LEN;
capab = 0;
if (conf->ft_over_ds)
capab |= RSN_FT_CAPAB_FT_OVER_DS;
*pos++ = capab;
return pos - buf;
}
int wpa_write_ftie(struct wpa_auth_config *conf, int use_sha384,
const u8 *r0kh_id, size_t r0kh_id_len,
const u8 *anonce, const u8 *snonce,
u8 *buf, size_t len, const u8 *subelem,
size_t subelem_len)
{
u8 *pos = buf, *ielen;
size_t hdrlen = use_sha384 ? sizeof(struct rsn_ftie_sha384) :
sizeof(struct rsn_ftie);
if (len < 2 + hdrlen + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
subelem_len)
return -1;
*pos++ = WLAN_EID_FAST_BSS_TRANSITION;
ielen = pos++;
if (use_sha384) {
struct rsn_ftie_sha384 *hdr = (struct rsn_ftie_sha384 *) pos;
os_memset(hdr, 0, sizeof(*hdr));
pos += sizeof(*hdr);
WPA_PUT_LE16(hdr->mic_control, 0);
if (anonce)
os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
if (snonce)
os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
} else {
struct rsn_ftie *hdr = (struct rsn_ftie *) pos;
os_memset(hdr, 0, sizeof(*hdr));
pos += sizeof(*hdr);
WPA_PUT_LE16(hdr->mic_control, 0);
if (anonce)
os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
if (snonce)
os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
}
/* Optional Parameters */
*pos++ = FTIE_SUBELEM_R1KH_ID;
*pos++ = FT_R1KH_ID_LEN;
os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
pos += FT_R1KH_ID_LEN;
if (r0kh_id) {
*pos++ = FTIE_SUBELEM_R0KH_ID;
*pos++ = r0kh_id_len;
os_memcpy(pos, r0kh_id, r0kh_id_len);
pos += r0kh_id_len;
}
if (subelem) {
os_memcpy(pos, subelem, subelem_len);
pos += subelem_len;
}
*ielen = pos - buf - 2;
return pos - buf;
}
/* A packet to be handled after seq response */
struct ft_remote_item {
struct dl_list list;
u8 nonce[FT_RRB_NONCE_LEN];
struct os_reltime nonce_ts;
u8 src_addr[ETH_ALEN];
u8 *enc;
size_t enc_len;
u8 *auth;
size_t auth_len;
int (*cb)(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int no_defer);
};
static void wpa_ft_rrb_seq_free(struct ft_remote_item *item)
{
eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, ELOOP_ALL_CTX, item);
dl_list_del(&item->list);
bin_clear_free(item->enc, item->enc_len);
os_free(item->auth);
os_free(item);
}
static void wpa_ft_rrb_seq_flush(struct wpa_authenticator *wpa_auth,
struct ft_remote_seq *rkh_seq, int cb)
{
struct ft_remote_item *item, *n;
dl_list_for_each_safe(item, n, &rkh_seq->rx.queue,
struct ft_remote_item, list) {
if (cb && item->cb)
item->cb(wpa_auth, item->src_addr, item->enc,
item->enc_len, item->auth, item->auth_len, 1);
wpa_ft_rrb_seq_free(item);
}
}
static void wpa_ft_rrb_seq_timeout(void *eloop_ctx, void *timeout_ctx)
{
struct ft_remote_item *item = timeout_ctx;
wpa_ft_rrb_seq_free(item);
}
static int
wpa_ft_rrb_seq_req(struct wpa_authenticator *wpa_auth,
struct ft_remote_seq *rkh_seq, const u8 *src_addr,
const u8 *f_r0kh_id, size_t f_r0kh_id_len,
const u8 *f_r1kh_id, const u8 *key, size_t key_len,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int (*cb)(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int no_defer))
{
struct ft_remote_item *item = NULL;
u8 *packet = NULL;
size_t packet_len;
struct tlv_list seq_req_auth[] = {
{ .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
.data = NULL /* to be filled: item->nonce */ },
{ .type = FT_RRB_R0KH_ID, .len = f_r0kh_id_len,
.data = f_r0kh_id },
{ .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
.data = f_r1kh_id },
{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
};
if (dl_list_len(&rkh_seq->rx.queue) >= ftRRBmaxQueueLen) {
wpa_printf(MSG_DEBUG, "FT: Sequence number queue too long");
goto err;
}
wpa_printf(MSG_DEBUG, "FT: Send out sequence number request to " MACSTR,
MAC2STR(src_addr));
item = os_zalloc(sizeof(*item));
if (!item)
goto err;
os_memcpy(item->src_addr, src_addr, ETH_ALEN);
item->cb = cb;
if (random_get_bytes(item->nonce, FT_RRB_NONCE_LEN) < 0) {
wpa_printf(MSG_DEBUG, "FT: Seq num nonce: out of random bytes");
goto err;
}
if (os_get_reltime(&item->nonce_ts) < 0)
goto err;
if (enc && enc_len > 0) {
item->enc = os_memdup(enc, enc_len);
item->enc_len = enc_len;
if (!item->enc)
goto err;
}
if (auth && auth_len > 0) {
item->auth = os_memdup(auth, auth_len);
item->auth_len = auth_len;
if (!item->auth)
goto err;
}
eloop_register_timeout(ftRRBseqTimeout, 0, wpa_ft_rrb_seq_timeout,
wpa_auth, item);
seq_req_auth[0].data = item->nonce;
if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_req_auth, NULL,
wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
&packet, &packet_len) < 0) {
item = NULL; /* some other seq resp might still accept this */
goto err;
}
dl_list_add(&rkh_seq->rx.queue, &item->list);
wpa_ft_rrb_oui_send(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
packet, packet_len);
os_free(packet);
return 0;
err:
wpa_printf(MSG_DEBUG, "FT: Failed to send sequence number request");
if (item) {
os_free(item->auth);
bin_clear_free(item->enc, item->enc_len);
os_free(item);
}
return -1;
}
#define FT_RRB_SEQ_OK 0
#define FT_RRB_SEQ_DROP 1
#define FT_RRB_SEQ_DEFER 2
static int
wpa_ft_rrb_seq_chk(struct ft_remote_seq *rkh_seq, const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
const char *msgtype, int no_defer)
{
const u8 *f_seq;
size_t f_seq_len;
const struct ft_rrb_seq *msg_both;
u32 msg_seq, msg_off, rkh_off;
struct os_reltime now;
unsigned int i;
RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
wpa_hexdump(MSG_DEBUG, "FT: sequence number", f_seq, f_seq_len);
msg_both = (const struct ft_rrb_seq *) f_seq;
if (rkh_seq->rx.num_last == 0) {
/* first packet from remote */
goto defer;
}
if (le_to_host32(msg_both->dom) != rkh_seq->rx.dom) {
/* remote might have rebooted */
goto defer;
}
if (os_get_reltime(&now) == 0) {
u32 msg_ts_now_remote, msg_ts_off;
struct os_reltime now_remote;
os_reltime_sub(&now, &rkh_seq->rx.time_offset, &now_remote);
msg_ts_now_remote = now_remote.sec;
msg_ts_off = le_to_host32(msg_both->ts) -
(msg_ts_now_remote - ftRRBseqTimeout);
if (msg_ts_off > 2 * ftRRBseqTimeout)
goto defer;
}
msg_seq = le_to_host32(msg_both->seq);
rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
msg_off = msg_seq - rkh_off;
if (msg_off > 0xC0000000)
goto out; /* too old message, drop it */
if (msg_off <= 0x40000000) {
for (i = 0; i < rkh_seq->rx.num_last; i++) {
if (rkh_seq->rx.last[i] == msg_seq)
goto out; /* duplicate message, drop it */
}
return FT_RRB_SEQ_OK;
}
defer:
if (no_defer)
goto out;
wpa_printf(MSG_DEBUG, "FT: Possibly invalid sequence number in %s from "
MACSTR, msgtype, MAC2STR(src_addr));
return FT_RRB_SEQ_DEFER;
out:
wpa_printf(MSG_DEBUG, "FT: Invalid sequence number in %s from " MACSTR,
msgtype, MAC2STR(src_addr));
return FT_RRB_SEQ_DROP;
}
static void
wpa_ft_rrb_seq_accept(struct wpa_authenticator *wpa_auth,
struct ft_remote_seq *rkh_seq, const u8 *src_addr,
const u8 *auth, size_t auth_len,
const char *msgtype)
{
const u8 *f_seq;
size_t f_seq_len;
const struct ft_rrb_seq *msg_both;
u32 msg_seq, msg_off, min_off, rkh_off;
int minidx = 0;
unsigned int i;
RRB_GET_AUTH(FT_RRB_SEQ, seq, msgtype, sizeof(*msg_both));
msg_both = (const struct ft_rrb_seq *) f_seq;
msg_seq = le_to_host32(msg_both->seq);
if (rkh_seq->rx.num_last < FT_REMOTE_SEQ_BACKLOG) {
rkh_seq->rx.last[rkh_seq->rx.num_last] = msg_seq;
rkh_seq->rx.num_last++;
return;
}
rkh_off = rkh_seq->rx.last[rkh_seq->rx.offsetidx];
for (i = 0; i < rkh_seq->rx.num_last; i++) {
msg_off = rkh_seq->rx.last[i] - rkh_off;
min_off = rkh_seq->rx.last[minidx] - rkh_off;
if (msg_off < min_off && i != rkh_seq->rx.offsetidx)
minidx = i;
}
rkh_seq->rx.last[rkh_seq->rx.offsetidx] = msg_seq;
rkh_seq->rx.offsetidx = minidx;
return;
out:
/* RRB_GET_AUTH should never fail here as
* wpa_ft_rrb_seq_chk() verified FT_RRB_SEQ presence. */
wpa_printf(MSG_ERROR, "FT: %s() failed", __func__);
}
static int wpa_ft_new_seq(struct ft_remote_seq *rkh_seq,
struct ft_rrb_seq *f_seq)
{
struct os_reltime now;
if (os_get_reltime(&now) < 0)
return -1;
if (!rkh_seq->tx.dom) {
if (random_get_bytes((u8 *) &rkh_seq->tx.seq,
sizeof(rkh_seq->tx.seq))) {
wpa_printf(MSG_ERROR,
"FT: Failed to get random data for sequence number initialization");
rkh_seq->tx.seq = now.usec;
}
if (random_get_bytes((u8 *) &rkh_seq->tx.dom,
sizeof(rkh_seq->tx.dom))) {
wpa_printf(MSG_ERROR,
"FT: Failed to get random data for sequence number initialization");
rkh_seq->tx.dom = now.usec;
}
rkh_seq->tx.dom |= 1;
}
f_seq->dom = host_to_le32(rkh_seq->tx.dom);
f_seq->seq = host_to_le32(rkh_seq->tx.seq);
f_seq->ts = host_to_le32(now.sec);
rkh_seq->tx.seq++;
return 0;
}
struct wpa_ft_pmk_r0_sa {
struct dl_list list;
u8 pmk_r0[PMK_LEN_MAX];
size_t pmk_r0_len;
u8 pmk_r0_name[WPA_PMK_NAME_LEN];
u8 spa[ETH_ALEN];
int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
struct vlan_description *vlan;
os_time_t expiration; /* 0 for no expiration */
u8 *identity;
size_t identity_len;
u8 *radius_cui;
size_t radius_cui_len;
os_time_t session_timeout; /* 0 for no expiration */
/* TODO: radius_class, EAP type */
int pmk_r1_pushed;
};
struct wpa_ft_pmk_r1_sa {
struct dl_list list;
u8 pmk_r1[PMK_LEN_MAX];
size_t pmk_r1_len;
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
u8 spa[ETH_ALEN];
int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
struct vlan_description *vlan;
u8 *identity;
size_t identity_len;
u8 *radius_cui;
size_t radius_cui_len;
os_time_t session_timeout; /* 0 for no expiration */
/* TODO: radius_class, EAP type */
};
struct wpa_ft_pmk_cache {
struct dl_list pmk_r0; /* struct wpa_ft_pmk_r0_sa */
struct dl_list pmk_r1; /* struct wpa_ft_pmk_r1_sa */
};
static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx);
static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx);
static void wpa_ft_free_pmk_r0(struct wpa_ft_pmk_r0_sa *r0)
{
if (!r0)
return;
dl_list_del(&r0->list);
eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
os_memset(r0->pmk_r0, 0, PMK_LEN_MAX);
os_free(r0->vlan);
os_free(r0->identity);
os_free(r0->radius_cui);
os_free(r0);
}
static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_ft_pmk_r0_sa *r0 = eloop_ctx;
struct os_reltime now;
int expires_in;
int session_timeout;
os_get_reltime(&now);
if (!r0)
return;
expires_in = r0->expiration - now.sec;
session_timeout = r0->session_timeout - now.sec;
/* conditions to remove from cache:
* a) r0->expiration is set and hit
* -or-
* b) r0->session_timeout is set and hit
*/
if ((!r0->expiration || expires_in > 0) &&
(!r0->session_timeout || session_timeout > 0)) {
wpa_printf(MSG_ERROR,
"FT: %s() called for non-expired entry %p",
__func__, r0);
eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
if (r0->expiration && expires_in > 0)
eloop_register_timeout(expires_in + 1, 0,
wpa_ft_expire_pmk_r0, r0, NULL);
if (r0->session_timeout && session_timeout > 0)
eloop_register_timeout(session_timeout + 1, 0,
wpa_ft_expire_pmk_r0, r0, NULL);
return;
}
wpa_ft_free_pmk_r0(r0);
}
static void wpa_ft_free_pmk_r1(struct wpa_ft_pmk_r1_sa *r1)
{
if (!r1)
return;
dl_list_del(&r1->list);
eloop_cancel_timeout(wpa_ft_expire_pmk_r1, r1, NULL);
os_memset(r1->pmk_r1, 0, PMK_LEN_MAX);
os_free(r1->vlan);
os_free(r1->identity);
os_free(r1->radius_cui);
os_free(r1);
}
static void wpa_ft_expire_pmk_r1(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_ft_pmk_r1_sa *r1 = eloop_ctx;
wpa_ft_free_pmk_r1(r1);
}
struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
{
struct wpa_ft_pmk_cache *cache;
cache = os_zalloc(sizeof(*cache));
if (cache) {
dl_list_init(&cache->pmk_r0);
dl_list_init(&cache->pmk_r1);
}
return cache;
}
void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
{
struct wpa_ft_pmk_r0_sa *r0, *r0prev;
struct wpa_ft_pmk_r1_sa *r1, *r1prev;
dl_list_for_each_safe(r0, r0prev, &cache->pmk_r0,
struct wpa_ft_pmk_r0_sa, list)
wpa_ft_free_pmk_r0(r0);
dl_list_for_each_safe(r1, r1prev, &cache->pmk_r1,
struct wpa_ft_pmk_r1_sa, list)
wpa_ft_free_pmk_r1(r1);
os_free(cache);
}
static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r0,
size_t pmk_r0_len,
const u8 *pmk_r0_name, int pairwise,
const struct vlan_description *vlan,
int expires_in, int session_timeout,
const u8 *identity, size_t identity_len,
const u8 *radius_cui, size_t radius_cui_len)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r0_sa *r0;
struct os_reltime now;
/* TODO: add limit on number of entries in cache */
os_get_reltime(&now);
r0 = os_zalloc(sizeof(*r0));
if (r0 == NULL)
return -1;
os_memcpy(r0->pmk_r0, pmk_r0, pmk_r0_len);
r0->pmk_r0_len = pmk_r0_len;
os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
os_memcpy(r0->spa, spa, ETH_ALEN);
r0->pairwise = pairwise;
if (expires_in > 0)
r0->expiration = now.sec + expires_in;
if (vlan && vlan->notempty) {
r0->vlan = os_zalloc(sizeof(*vlan));
if (!r0->vlan) {
bin_clear_free(r0, sizeof(*r0));
return -1;
}
*r0->vlan = *vlan;
}
if (identity) {
r0->identity = os_malloc(identity_len);
if (r0->identity) {
os_memcpy(r0->identity, identity, identity_len);
r0->identity_len = identity_len;
}
}
if (radius_cui) {
r0->radius_cui = os_malloc(radius_cui_len);
if (r0->radius_cui) {
os_memcpy(r0->radius_cui, radius_cui, radius_cui_len);
r0->radius_cui_len = radius_cui_len;
}
}
if (session_timeout > 0)
r0->session_timeout = now.sec + session_timeout;
dl_list_add(&cache->pmk_r0, &r0->list);
if (expires_in > 0)
eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r0,
r0, NULL);
if (session_timeout > 0)
eloop_register_timeout(session_timeout + 1, 0,
wpa_ft_expire_pmk_r0, r0, NULL);
return 0;
}
static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r0_name,
const struct wpa_ft_pmk_r0_sa **r0_out)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r0_sa *r0;
struct os_reltime now;
os_get_reltime(&now);
dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
WPA_PMK_NAME_LEN) == 0) {
*r0_out = r0;
return 0;
}
}
*r0_out = NULL;
return -1;
}
static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r1,
size_t pmk_r1_len,
const u8 *pmk_r1_name, int pairwise,
const struct vlan_description *vlan,
int expires_in, int session_timeout,
const u8 *identity, size_t identity_len,
const u8 *radius_cui, size_t radius_cui_len)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
int max_expires_in = wpa_auth->conf.r1_max_key_lifetime;
struct wpa_ft_pmk_r1_sa *r1;
struct os_reltime now;
/* TODO: limit on number of entries in cache */
os_get_reltime(&now);
if (max_expires_in && (max_expires_in < expires_in || expires_in == 0))
expires_in = max_expires_in;
r1 = os_zalloc(sizeof(*r1));
if (r1 == NULL)
return -1;
os_memcpy(r1->pmk_r1, pmk_r1, pmk_r1_len);
r1->pmk_r1_len = pmk_r1_len;
os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
os_memcpy(r1->spa, spa, ETH_ALEN);
r1->pairwise = pairwise;
if (vlan && vlan->notempty) {
r1->vlan = os_zalloc(sizeof(*vlan));
if (!r1->vlan) {
bin_clear_free(r1, sizeof(*r1));
return -1;
}
*r1->vlan = *vlan;
}
if (identity) {
r1->identity = os_malloc(identity_len);
if (r1->identity) {
os_memcpy(r1->identity, identity, identity_len);
r1->identity_len = identity_len;
}
}
if (radius_cui) {
r1->radius_cui = os_malloc(radius_cui_len);
if (r1->radius_cui) {
os_memcpy(r1->radius_cui, radius_cui, radius_cui_len);
r1->radius_cui_len = radius_cui_len;
}
}
if (session_timeout > 0)
r1->session_timeout = now.sec + session_timeout;
dl_list_add(&cache->pmk_r1, &r1->list);
if (expires_in > 0)
eloop_register_timeout(expires_in + 1, 0, wpa_ft_expire_pmk_r1,
r1, NULL);
if (session_timeout > 0)
eloop_register_timeout(session_timeout + 1, 0,
wpa_ft_expire_pmk_r1, r1, NULL);
return 0;
}
static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r1_name,
u8 *pmk_r1, size_t *pmk_r1_len, int *pairwise,
struct vlan_description *vlan,
const u8 **identity, size_t *identity_len,
const u8 **radius_cui, size_t *radius_cui_len,
int *session_timeout)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r1_sa *r1;
struct os_reltime now;
os_get_reltime(&now);
dl_list_for_each(r1, &cache->pmk_r1, struct wpa_ft_pmk_r1_sa, list) {
if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
WPA_PMK_NAME_LEN) == 0) {
os_memcpy(pmk_r1, r1->pmk_r1, r1->pmk_r1_len);
*pmk_r1_len = r1->pmk_r1_len;
if (pairwise)
*pairwise = r1->pairwise;
if (vlan && r1->vlan)
*vlan = *r1->vlan;
if (vlan && !r1->vlan)
os_memset(vlan, 0, sizeof(*vlan));
if (identity && identity_len) {
*identity = r1->identity;
*identity_len = r1->identity_len;
}
if (radius_cui && radius_cui_len) {
*radius_cui = r1->radius_cui;
*radius_cui_len = r1->radius_cui_len;
}
if (session_timeout && r1->session_timeout > now.sec)
*session_timeout = r1->session_timeout -
now.sec;
else if (session_timeout && r1->session_timeout)
*session_timeout = 1;
else if (session_timeout)
*session_timeout = 0;
return 0;
}
}
return -1;
}
static int wpa_ft_rrb_init_r0kh_seq(struct ft_remote_r0kh *r0kh)
{
if (r0kh->seq)
return 0;
r0kh->seq = os_zalloc(sizeof(*r0kh->seq));
if (!r0kh->seq) {
wpa_printf(MSG_DEBUG, "FT: Failed to allocate r0kh->seq");
return -1;
}
dl_list_init(&r0kh->seq->rx.queue);
return 0;
}
static void wpa_ft_rrb_lookup_r0kh(struct wpa_authenticator *wpa_auth,
const u8 *f_r0kh_id, size_t f_r0kh_id_len,
struct ft_remote_r0kh **r0kh_out,
struct ft_remote_r0kh **r0kh_wildcard)
{
struct ft_remote_r0kh *r0kh;
*r0kh_wildcard = NULL;
*r0kh_out = NULL;
if (wpa_auth->conf.r0kh_list)
r0kh = *wpa_auth->conf.r0kh_list;
else
r0kh = NULL;
for (; r0kh; r0kh = r0kh->next) {
if (r0kh->id_len == 1 && r0kh->id[0] == '*')
*r0kh_wildcard = r0kh;
if (f_r0kh_id && r0kh->id_len == f_r0kh_id_len &&
os_memcmp_const(f_r0kh_id, r0kh->id, f_r0kh_id_len) == 0)
*r0kh_out = r0kh;
}
if (!*r0kh_out && !*r0kh_wildcard)
wpa_printf(MSG_DEBUG, "FT: No matching R0KH found");
if (*r0kh_out && wpa_ft_rrb_init_r0kh_seq(*r0kh_out) < 0)
*r0kh_out = NULL;
}
static int wpa_ft_rrb_init_r1kh_seq(struct ft_remote_r1kh *r1kh)
{
if (r1kh->seq)
return 0;
r1kh->seq = os_zalloc(sizeof(*r1kh->seq));
if (!r1kh->seq) {
wpa_printf(MSG_DEBUG, "FT: Failed to allocate r1kh->seq");
return -1;
}
dl_list_init(&r1kh->seq->rx.queue);
return 0;
}
static void wpa_ft_rrb_lookup_r1kh(struct wpa_authenticator *wpa_auth,
const u8 *f_r1kh_id,
struct ft_remote_r1kh **r1kh_out,
struct ft_remote_r1kh **r1kh_wildcard)
{
struct ft_remote_r1kh *r1kh;
*r1kh_wildcard = NULL;
*r1kh_out = NULL;
if (wpa_auth->conf.r1kh_list)
r1kh = *wpa_auth->conf.r1kh_list;
else
r1kh = NULL;
for (; r1kh; r1kh = r1kh->next) {
if (is_zero_ether_addr(r1kh->addr) &&
is_zero_ether_addr(r1kh->id))
*r1kh_wildcard = r1kh;
if (f_r1kh_id &&
os_memcmp_const(r1kh->id, f_r1kh_id, FT_R1KH_ID_LEN) == 0)
*r1kh_out = r1kh;
}
if (!*r1kh_out && !*r1kh_wildcard)
wpa_printf(MSG_DEBUG, "FT: No matching R1KH found");
if (*r1kh_out && wpa_ft_rrb_init_r1kh_seq(*r1kh_out) < 0)
*r1kh_out = NULL;
}
static int wpa_ft_rrb_check_r0kh(struct wpa_authenticator *wpa_auth,
const u8 *f_r0kh_id, size_t f_r0kh_id_len)
{
if (f_r0kh_id_len != wpa_auth->conf.r0_key_holder_len ||
os_memcmp_const(f_r0kh_id, wpa_auth->conf.r0_key_holder,
f_r0kh_id_len) != 0)
return -1;
return 0;
}
static int wpa_ft_rrb_check_r1kh(struct wpa_authenticator *wpa_auth,
const u8 *f_r1kh_id)
{
if (os_memcmp_const(f_r1kh_id, wpa_auth->conf.r1_key_holder,
FT_R1KH_ID_LEN) != 0)
return -1;
return 0;
}
static void wpa_ft_rrb_del_r0kh(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_authenticator *wpa_auth = eloop_ctx;
struct ft_remote_r0kh *r0kh, *prev = NULL;
if (!wpa_auth->conf.r0kh_list)
return;
for (r0kh = *wpa_auth->conf.r0kh_list; r0kh; r0kh = r0kh->next) {
if (r0kh == timeout_ctx)
break;
prev = r0kh;
}
if (!r0kh)
return;
if (prev)
prev->next = r0kh->next;
else
*wpa_auth->conf.r0kh_list = r0kh->next;
if (r0kh->seq)
wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
os_free(r0kh->seq);
os_free(r0kh);
}
static void wpa_ft_rrb_r0kh_replenish(struct wpa_authenticator *wpa_auth,
struct ft_remote_r0kh *r0kh, int timeout)
{
if (timeout > 0)
eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
wpa_auth, r0kh);
}
static void wpa_ft_rrb_r0kh_timeout(struct wpa_authenticator *wpa_auth,
struct ft_remote_r0kh *r0kh, int timeout)
{
eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth, r0kh);
if (timeout > 0)
eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
wpa_auth, r0kh);
}
static struct ft_remote_r0kh *
wpa_ft_rrb_add_r0kh(struct wpa_authenticator *wpa_auth,
struct ft_remote_r0kh *r0kh_wildcard,
const u8 *src_addr, const u8 *r0kh_id, size_t id_len,
int timeout)
{
struct ft_remote_r0kh *r0kh;
if (!wpa_auth->conf.r0kh_list)
return NULL;
r0kh = os_zalloc(sizeof(*r0kh));
if (!r0kh)
return NULL;
if (src_addr)
os_memcpy(r0kh->addr, src_addr, sizeof(r0kh->addr));
if (id_len > FT_R0KH_ID_MAX_LEN)
id_len = FT_R0KH_ID_MAX_LEN;
os_memcpy(r0kh->id, r0kh_id, id_len);
r0kh->id_len = id_len;
os_memcpy(r0kh->key, r0kh_wildcard->key, sizeof(r0kh->key));
r0kh->next = *wpa_auth->conf.r0kh_list;
*wpa_auth->conf.r0kh_list = r0kh;
if (timeout > 0)
eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r0kh,
wpa_auth, r0kh);
if (wpa_ft_rrb_init_r0kh_seq(r0kh) < 0)
return NULL;
return r0kh;
}
static void wpa_ft_rrb_del_r1kh(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_authenticator *wpa_auth = eloop_ctx;
struct ft_remote_r1kh *r1kh, *prev = NULL;
if (!wpa_auth->conf.r1kh_list)
return;
for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
if (r1kh == timeout_ctx)
break;
prev = r1kh;
}
if (!r1kh)
return;
if (prev)
prev->next = r1kh->next;
else
*wpa_auth->conf.r1kh_list = r1kh->next;
if (r1kh->seq)
wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
os_free(r1kh->seq);
os_free(r1kh);
}
static void wpa_ft_rrb_r1kh_replenish(struct wpa_authenticator *wpa_auth,
struct ft_remote_r1kh *r1kh, int timeout)
{
if (timeout > 0)
eloop_replenish_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
wpa_auth, r1kh);
}
static struct ft_remote_r1kh *
wpa_ft_rrb_add_r1kh(struct wpa_authenticator *wpa_auth,
struct ft_remote_r1kh *r1kh_wildcard,
const u8 *src_addr, const u8 *r1kh_id, int timeout)
{
struct ft_remote_r1kh *r1kh;
if (!wpa_auth->conf.r1kh_list)
return NULL;
r1kh = os_zalloc(sizeof(*r1kh));
if (!r1kh)
return NULL;
os_memcpy(r1kh->addr, src_addr, sizeof(r1kh->addr));
os_memcpy(r1kh->id, r1kh_id, sizeof(r1kh->id));
os_memcpy(r1kh->key, r1kh_wildcard->key, sizeof(r1kh->key));
r1kh->next = *wpa_auth->conf.r1kh_list;
*wpa_auth->conf.r1kh_list = r1kh;
if (timeout > 0)
eloop_register_timeout(timeout, 0, wpa_ft_rrb_del_r1kh,
wpa_auth, r1kh);
if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
return NULL;
return r1kh;
}
void wpa_ft_sta_deinit(struct wpa_state_machine *sm)
{
eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
}
static void wpa_ft_deinit_seq(struct wpa_authenticator *wpa_auth)
{
struct ft_remote_r0kh *r0kh;
struct ft_remote_r1kh *r1kh;
eloop_cancel_timeout(wpa_ft_rrb_seq_timeout, wpa_auth, ELOOP_ALL_CTX);
if (wpa_auth->conf.r0kh_list)
r0kh = *wpa_auth->conf.r0kh_list;
else
r0kh = NULL;
for (; r0kh; r0kh = r0kh->next) {
if (!r0kh->seq)
continue;
wpa_ft_rrb_seq_flush(wpa_auth, r0kh->seq, 0);
os_free(r0kh->seq);
r0kh->seq = NULL;
}
if (wpa_auth->conf.r1kh_list)
r1kh = *wpa_auth->conf.r1kh_list;
else
r1kh = NULL;
for (; r1kh; r1kh = r1kh->next) {
if (!r1kh->seq)
continue;
wpa_ft_rrb_seq_flush(wpa_auth, r1kh->seq, 0);
os_free(r1kh->seq);
r1kh->seq = NULL;
}
}
static void wpa_ft_deinit_rkh_tmp(struct wpa_authenticator *wpa_auth)
{
struct ft_remote_r0kh *r0kh, *r0kh_next, *r0kh_prev = NULL;
struct ft_remote_r1kh *r1kh, *r1kh_next, *r1kh_prev = NULL;
if (wpa_auth->conf.r0kh_list)
r0kh = *wpa_auth->conf.r0kh_list;
else
r0kh = NULL;
while (r0kh) {
r0kh_next = r0kh->next;
if (eloop_cancel_timeout(wpa_ft_rrb_del_r0kh, wpa_auth,
r0kh) > 0) {
if (r0kh_prev)
r0kh_prev->next = r0kh_next;
else
*wpa_auth->conf.r0kh_list = r0kh_next;
os_free(r0kh);
} else {
r0kh_prev = r0kh;
}
r0kh = r0kh_next;
}
if (wpa_auth->conf.r1kh_list)
r1kh = *wpa_auth->conf.r1kh_list;
else
r1kh = NULL;
while (r1kh) {
r1kh_next = r1kh->next;
if (eloop_cancel_timeout(wpa_ft_rrb_del_r1kh, wpa_auth,
r1kh) > 0) {
if (r1kh_prev)
r1kh_prev->next = r1kh_next;
else
*wpa_auth->conf.r1kh_list = r1kh_next;
os_free(r1kh);
} else {
r1kh_prev = r1kh;
}
r1kh = r1kh_next;
}
}
void wpa_ft_deinit(struct wpa_authenticator *wpa_auth)
{
wpa_ft_deinit_seq(wpa_auth);
wpa_ft_deinit_rkh_tmp(wpa_auth);
}
static void wpa_ft_block_r0kh(struct wpa_authenticator *wpa_auth,
const u8 *f_r0kh_id, size_t f_r0kh_id_len)
{
struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
if (!wpa_auth->conf.rkh_neg_timeout)
return;
wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
&r0kh, &r0kh_wildcard);
if (!r0kh_wildcard) {
/* r0kh removed after neg_timeout and might need re-adding */
return;
}
wpa_hexdump(MSG_DEBUG, "FT: Blacklist R0KH-ID",
f_r0kh_id, f_r0kh_id_len);
if (r0kh) {
wpa_ft_rrb_r0kh_timeout(wpa_auth, r0kh,
wpa_auth->conf.rkh_neg_timeout);
os_memset(r0kh->addr, 0, ETH_ALEN);
} else
wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, NULL, f_r0kh_id,
f_r0kh_id_len,
wpa_auth->conf.rkh_neg_timeout);
}
static void wpa_ft_expire_pull(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_state_machine *sm = eloop_ctx;
wpa_printf(MSG_DEBUG, "FT: Timeout pending pull request for " MACSTR,
MAC2STR(sm->addr));
if (sm->ft_pending_pull_left_retries <= 0)
wpa_ft_block_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len);
/* cancel multiple timeouts */
eloop_cancel_timeout(wpa_ft_expire_pull, sm, NULL);
ft_finish_pull(sm);
}
static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
const u8 *ies, size_t ies_len,
const u8 *pmk_r0_name)
{
struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
u8 *packet = NULL;
const u8 *key, *f_r1kh_id = sm->wpa_auth->conf.r1_key_holder;
size_t packet_len, key_len;
struct ft_rrb_seq f_seq;
int tsecs, tusecs, first;
struct wpabuf *ft_pending_req_ies;
int r0kh_timeout;
struct tlv_list req_enc[] = {
{ .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
.data = pmk_r0_name },
{ .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
.data = sm->addr },
{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
};
struct tlv_list req_auth[] = {
{ .type = FT_RRB_NONCE, .len = FT_RRB_NONCE_LEN,
.data = sm->ft_pending_pull_nonce },
{ .type = FT_RRB_SEQ, .len = sizeof(f_seq),
.data = (u8 *) &f_seq },
{ .type = FT_RRB_R0KH_ID, .len = sm->r0kh_id_len,
.data = sm->r0kh_id },
{ .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
.data = f_r1kh_id },
{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
};
if (sm->ft_pending_pull_left_retries <= 0)
return -1;
first = sm->ft_pending_pull_left_retries ==
sm->wpa_auth->conf.rkh_pull_retries;
sm->ft_pending_pull_left_retries--;
wpa_ft_rrb_lookup_r0kh(sm->wpa_auth, sm->r0kh_id, sm->r0kh_id_len,
&r0kh, &r0kh_wildcard);
/* Keep r0kh sufficiently long in the list for seq num check */
r0kh_timeout = sm->wpa_auth->conf.rkh_pull_timeout / 1000 +
1 + ftRRBseqTimeout;
if (r0kh) {
wpa_ft_rrb_r0kh_replenish(sm->wpa_auth, r0kh, r0kh_timeout);
} else if (r0kh_wildcard) {
wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
/* r0kh->addr: updated by SEQ_RESP and wpa_ft_expire_pull */
r0kh = wpa_ft_rrb_add_r0kh(sm->wpa_auth, r0kh_wildcard,
r0kh_wildcard->addr,
sm->r0kh_id, sm->r0kh_id_len,
r0kh_timeout);
}
if (r0kh == NULL) {
wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
sm->r0kh_id, sm->r0kh_id_len);
return -1;
}
if (is_zero_ether_addr(r0kh->addr)) {
wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID is blacklisted",
sm->r0kh_id, sm->r0kh_id_len);
return -1;
}
if (os_memcmp(r0kh->addr, sm->wpa_auth->addr, ETH_ALEN) == 0) {
wpa_printf(MSG_DEBUG,
"FT: R0KH-ID points to self - no matching key available");
return -1;
}
key = r0kh->key;
key_len = sizeof(r0kh->key);
wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
"address " MACSTR, MAC2STR(r0kh->addr));
if (r0kh->seq->rx.num_last == 0) {
/* A sequence request will be sent out anyway when pull
* response is received. Send it out now to avoid one RTT. */
wpa_ft_rrb_seq_req(sm->wpa_auth, r0kh->seq, r0kh->addr,
r0kh->id, r0kh->id_len, f_r1kh_id, key,
key_len, NULL, 0, NULL, 0, NULL);
}
if (first &&
random_get_bytes(sm->ft_pending_pull_nonce, FT_RRB_NONCE_LEN) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
"nonce");
return -1;
}
if (wpa_ft_new_seq(r0kh->seq, &f_seq) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
return -1;
}
if (wpa_ft_rrb_build(key, key_len, req_enc, NULL, req_auth, NULL,
sm->wpa_auth->addr, FT_PACKET_R0KH_R1KH_PULL,
&packet, &packet_len) < 0)
return -1;
ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
wpabuf_free(sm->ft_pending_req_ies);
sm->ft_pending_req_ies = ft_pending_req_ies;
if (!sm->ft_pending_req_ies) {
os_free(packet);
return -1;
}
tsecs = sm->wpa_auth->conf.rkh_pull_timeout / 1000;
tusecs = (sm->wpa_auth->conf.rkh_pull_timeout % 1000) * 1000;
eloop_register_timeout(tsecs, tusecs, wpa_ft_expire_pull, sm, NULL);
wpa_ft_rrb_oui_send(sm->wpa_auth, r0kh->addr, FT_PACKET_R0KH_R1KH_PULL,
packet, packet_len);
os_free(packet);
return 0;
}
int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
const u8 *pmk_r0, const u8 *pmk_r0_name)
{
int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
struct vlan_description vlan;
const u8 *identity, *radius_cui;
size_t identity_len, radius_cui_len;
int session_timeout;
size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
SHA384_MAC_LEN : PMK_LEN;
if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
MAC2STR(sm->addr));
return -1;
}
identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
&radius_cui);
session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
return wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
pmk_r0_name, sm->pairwise, &vlan, expires_in,
session_timeout, identity, identity_len,
radius_cui, radius_cui_len);
}
int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
struct wpa_ptk *ptk)
{
u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
SHA384_MAC_LEN : PMK_LEN;
size_t pmk_r1_len = pmk_r0_len;
u8 pmk_r1[PMK_LEN_MAX];
u8 ptk_name[WPA_PMK_NAME_LEN];
const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
const u8 *ssid = sm->wpa_auth->conf.ssid;
size_t ssid_len = sm->wpa_auth->conf.ssid_len;
int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
int expires_in = sm->wpa_auth->conf.r0_key_lifetime;
struct vlan_description vlan;
const u8 *identity, *radius_cui;
size_t identity_len, radius_cui_len;
int session_timeout;
if (sm->xxkey_len == 0) {
wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
"derivation");
return -1;
}
if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
MAC2STR(sm->addr));
return -1;
}
identity_len = wpa_ft_get_identity(sm->wpa_auth, sm->addr, &identity);
radius_cui_len = wpa_ft_get_radius_cui(sm->wpa_auth, sm->addr,
&radius_cui);
session_timeout = wpa_ft_get_session_timeout(sm->wpa_auth, sm->addr);
if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
r0kh, r0kh_len, sm->addr,
pmk_r0, pmk_r0_name,
wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, pmk_r0_len);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_len,
pmk_r0_name,
sm->pairwise, &vlan, expires_in,
session_timeout, identity, identity_len,
radius_cui, radius_cui_len);
if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_len, pmk_r0_name, r1kh, sm->addr,
pmk_r1, sm->pmk_r1_name) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, pmk_r1_len);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
WPA_PMK_NAME_LEN);
if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_len,
sm->pmk_r1_name, sm->pairwise, &vlan,
expires_in, session_timeout, identity,
identity_len, radius_cui, radius_cui_len);
return wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
sm->addr, sm->wpa_auth->addr, sm->pmk_r1_name,
ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
}
static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
const u8 *addr, int idx, u8 *seq)
{
if (wpa_auth->cb->get_seqnum == NULL)
return -1;
return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
}
static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
u8 *subelem;
struct wpa_group *gsm = sm->group;
size_t subelem_len, pad_len;
const u8 *key;
size_t key_len;
u8 keybuf[32];
const u8 *kek;
size_t kek_len;
if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
kek = sm->PTK.kek2;
kek_len = sm->PTK.kek2_len;
} else {
kek = sm->PTK.kek;
kek_len = sm->PTK.kek_len;
}
key_len = gsm->GTK_len;
if (key_len > sizeof(keybuf))
return NULL;
/*
* Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
* than 16 bytes.
*/
pad_len = key_len % 8;
if (pad_len)
pad_len = 8 - pad_len;
if (key_len + pad_len < 16)
pad_len += 8;
if (pad_len && key_len < sizeof(keybuf)) {
os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
os_memset(keybuf + key_len, 0, pad_len);
keybuf[key_len] = 0xdd;
key_len += pad_len;
key = keybuf;
} else
key = gsm->GTK[gsm->GN - 1];
/*
* Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
* Key[5..32].
*/
subelem_len = 13 + key_len + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return NULL;
subelem[0] = FTIE_SUBELEM_GTK;
subelem[1] = 11 + key_len + 8;
/* Key ID in B0-B1 of Key Info */
WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
subelem[4] = gsm->GTK_len;
wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
if (aes_wrap(kek, kek_len, key_len / 8, key, subelem + 13)) {
wpa_printf(MSG_DEBUG,
"FT: GTK subelem encryption failed: kek_len=%d",
(int) kek_len);
os_free(subelem);
return NULL;
}
*len = subelem_len;
return subelem;
}
#ifdef CONFIG_IEEE80211W
static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
u8 *subelem, *pos;
struct wpa_group *gsm = sm->group;
size_t subelem_len;
const u8 *kek;
size_t kek_len;
size_t igtk_len;
if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
kek = sm->PTK.kek2;
kek_len = sm->PTK.kek2_len;
} else {
kek = sm->PTK.kek;
kek_len = sm->PTK.kek_len;
}
igtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
/* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
* Key[16+8] */
subelem_len = 1 + 1 + 2 + 6 + 1 + igtk_len + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return NULL;
pos = subelem;
*pos++ = FTIE_SUBELEM_IGTK;
*pos++ = subelem_len - 2;
WPA_PUT_LE16(pos, gsm->GN_igtk);
pos += 2;
wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
pos += 6;
*pos++ = igtk_len;
if (aes_wrap(kek, kek_len, igtk_len / 8,
gsm->IGTK[gsm->GN_igtk - 4], pos)) {
wpa_printf(MSG_DEBUG,
"FT: IGTK subelem encryption failed: kek_len=%d",
(int) kek_len);
os_free(subelem);
return NULL;
}
*len = subelem_len;
return subelem;
}
#endif /* CONFIG_IEEE80211W */
static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
u8 *pos, u8 *end, u8 id, u8 descr_count,
const u8 *ies, size_t ies_len)
{
struct ieee802_11_elems parse;
struct rsn_rdie *rdie;
wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
id, descr_count);
wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
ies, ies_len);
if (end - pos < (int) sizeof(*rdie)) {
wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
return pos;
}
*pos++ = WLAN_EID_RIC_DATA;
*pos++ = sizeof(*rdie);
rdie = (struct rsn_rdie *) pos;
rdie->id = id;
rdie->descr_count = 0;
rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
pos += sizeof(*rdie);
if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
ParseFailed) {
wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
rdie->status_code =
host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
if (parse.wmm_tspec) {
struct wmm_tspec_element *tspec;
if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
"(%d)", (int) parse.wmm_tspec_len);
rdie->status_code =
host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
if (end - pos < (int) sizeof(*tspec)) {
wpa_printf(MSG_ERROR, "FT: Not enough room for "
"response TSPEC");
rdie->status_code =
host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
tspec = (struct wmm_tspec_element *) pos;
os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
}
#ifdef NEED_AP_MLME
if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
int res;
res = wmm_process_tspec((struct wmm_tspec_element *) pos);
wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
rdie->status_code =
host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
else if (res == WMM_ADDTS_STATUS_REFUSED)
rdie->status_code =
host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
else {
/* TSPEC accepted; include updated TSPEC in response */
rdie->descr_count = 1;
pos += sizeof(struct wmm_tspec_element);
}
return pos;
}
#endif /* NEED_AP_MLME */
if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
int res;
res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
sizeof(struct wmm_tspec_element));
if (res >= 0) {
if (res)
rdie->status_code = host_to_le16(res);
else {
/* TSPEC accepted; include updated TSPEC in
* response */
rdie->descr_count = 1;
pos += sizeof(struct wmm_tspec_element);
}
return pos;
}
}
wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
const u8 *ric, size_t ric_len)
{
const u8 *rpos, *start;
const struct rsn_rdie *rdie;
wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
rpos = ric;
while (rpos + sizeof(*rdie) < ric + ric_len) {
if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
rpos + 2 + rpos[1] > ric + ric_len)
break;
rdie = (const struct rsn_rdie *) (rpos + 2);
rpos += 2 + rpos[1];
start = rpos;
while (rpos + 2 <= ric + ric_len &&
rpos + 2 + rpos[1] <= ric + ric_len) {
if (rpos[0] == WLAN_EID_RIC_DATA)
break;
rpos += 2 + rpos[1];
}
pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
rdie->descr_count,
start, rpos - start);
}
return pos;
}
u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
size_t max_len, int auth_alg,
const u8 *req_ies, size_t req_ies_len)
{
u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
u8 *fte_mic, *elem_count;
size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
int res;
struct wpa_auth_config *conf;
struct wpa_ft_ies parse;
u8 *ric_start;
u8 *anonce, *snonce;
const u8 *kck;
size_t kck_len;
int use_sha384;
if (sm == NULL)
return pos;
use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
conf = &sm->wpa_auth->conf;
if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
return pos;
end = pos + max_len;
if (auth_alg == WLAN_AUTH_FT ||
((auth_alg == WLAN_AUTH_FILS_SK ||
auth_alg == WLAN_AUTH_FILS_SK_PFS ||
auth_alg == WLAN_AUTH_FILS_PK) &&
(sm->wpa_key_mgmt & (WPA_KEY_MGMT_FT_FILS_SHA256 |
WPA_KEY_MGMT_FT_FILS_SHA384)))) {
if (!sm->pmk_r1_name_valid) {
wpa_printf(MSG_ERROR,
"FT: PMKR1Name is not valid for Assoc Resp RSNE");
return NULL;
}
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name for Assoc Resp RSNE",
sm->pmk_r1_name, WPA_PMK_NAME_LEN);
/*
* RSN (only present if this is a Reassociation Response and
* part of a fast BSS transition; or if this is a
* (Re)Association Response frame during an FT initial mobility
* domain association using FILS)
*/
res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
if (res < 0)
return NULL;
rsnie = pos;
rsnie_len = res;
pos += res;
}
/* Mobility Domain Information */
res = wpa_write_mdie(conf, pos, end - pos);
if (res < 0)
return NULL;
mdie = pos;
mdie_len = res;
pos += res;
/* Fast BSS Transition Information */
if (auth_alg == WLAN_AUTH_FT) {
subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
if (!subelem) {
wpa_printf(MSG_DEBUG,
"FT: Failed to add GTK subelement");
return NULL;
}
r0kh_id = sm->r0kh_id;
r0kh_id_len = sm->r0kh_id_len;
anonce = sm->ANonce;
snonce = sm->SNonce;
#ifdef CONFIG_IEEE80211W
if (sm->mgmt_frame_prot) {
u8 *igtk;
size_t igtk_len;
u8 *nbuf;
igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
if (igtk == NULL) {
wpa_printf(MSG_DEBUG,
"FT: Failed to add IGTK subelement");
os_free(subelem);
return NULL;
}
nbuf = os_realloc(subelem, subelem_len + igtk_len);
if (nbuf == NULL) {
os_free(subelem);
os_free(igtk);
return NULL;
}
subelem = nbuf;
os_memcpy(subelem + subelem_len, igtk, igtk_len);
subelem_len += igtk_len;
os_free(igtk);
}
#endif /* CONFIG_IEEE80211W */
#ifdef CONFIG_OCV
if (wpa_auth_uses_ocv(sm)) {
struct wpa_channel_info ci;
u8 *nbuf, *ocipos;
if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
wpa_printf(MSG_WARNING,
"Failed to get channel info for OCI element");
os_free(subelem);
return NULL;
}
subelem_len += 2 + OCV_OCI_LEN;
nbuf = os_realloc(subelem, subelem_len);
if (!nbuf) {
os_free(subelem);
return NULL;
}
subelem = nbuf;
ocipos = subelem + subelem_len - 2 - OCV_OCI_LEN;
*ocipos++ = FTIE_SUBELEM_OCI;
*ocipos++ = OCV_OCI_LEN;
if (ocv_insert_oci(&ci, &ocipos) < 0) {
os_free(subelem);
return NULL;
}
}
#endif /* CONFIG_OCV */
} else {
r0kh_id = conf->r0_key_holder;
r0kh_id_len = conf->r0_key_holder_len;
anonce = NULL;
snonce = NULL;
}
res = wpa_write_ftie(conf, use_sha384, r0kh_id, r0kh_id_len,
anonce, snonce, pos, end - pos,
subelem, subelem_len);
os_free(subelem);
if (res < 0)
return NULL;
ftie = pos;
ftie_len = res;
pos += res;
if (use_sha384) {
struct rsn_ftie_sha384 *_ftie =
(struct rsn_ftie_sha384 *) (ftie + 2);
fte_mic = _ftie->mic;
elem_count = &_ftie->mic_control[1];
} else {
struct rsn_ftie *_ftie = (struct rsn_ftie *) (ftie + 2);
fte_mic = _ftie->mic;
elem_count = &_ftie->mic_control[1];
}
if (auth_alg == WLAN_AUTH_FT)
*elem_count = 3; /* Information element count */
ric_start = pos;
if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse, use_sha384) == 0
&& parse.ric) {
pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
parse.ric_len);
if (auth_alg == WLAN_AUTH_FT)
*elem_count +=
ieee802_11_ie_count(ric_start,
pos - ric_start);
}
if (ric_start == pos)
ric_start = NULL;
if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
kck = sm->PTK.kck2;
kck_len = sm->PTK.kck2_len;
} else {
kck = sm->PTK.kck;
kck_len = sm->PTK.kck_len;
}
if (auth_alg == WLAN_AUTH_FT &&
wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 6,
mdie, mdie_len, ftie, ftie_len,
rsnie, rsnie_len,
ric_start, ric_start ? pos - ric_start : 0,
fte_mic) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
return NULL;
}
os_free(sm->assoc_resp_ftie);
sm->assoc_resp_ftie = os_malloc(ftie_len);
if (!sm->assoc_resp_ftie)
return NULL;
os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
return pos;
}
static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
int vlan_id,
enum wpa_alg alg, const u8 *addr, int idx,
u8 *key, size_t key_len)
{
if (wpa_auth->cb->set_key == NULL)
return -1;
return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
key, key_len);
}
void wpa_ft_install_ptk(struct wpa_state_machine *sm)
{
enum wpa_alg alg;
int klen;
/* MLME-SETKEYS.request(PTK) */
alg = wpa_cipher_to_alg(sm->pairwise);
klen = wpa_cipher_key_len(sm->pairwise);
if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
"PTK configuration", sm->pairwise);
return;
}
if (sm->tk_already_set) {
/* Must avoid TK reconfiguration to prevent clearing of TX/RX
* PN in the driver */
wpa_printf(MSG_DEBUG,
"FT: Do not re-install same PTK to the driver");
return;
}
/* FIX: add STA entry to kernel/driver here? The set_key will fail
* most likely without this.. At the moment, STA entry is added only
* after association has been completed. This function will be called
* again after association to get the PTK configured, but that could be
* optimized by adding the STA entry earlier.
*/
if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
sm->PTK.tk, klen))
return;
/* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
sm->pairwise_set = TRUE;
sm->tk_already_set = TRUE;
}
/* Derive PMK-R1 from PSK, check all available PSK */
static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
const u8 *req_pmk_r1_name,
u8 *out_pmk_r1, int *out_pairwise,
struct vlan_description *out_vlan,
const u8 **out_identity, size_t *out_identity_len,
const u8 **out_radius_cui,
size_t *out_radius_cui_len,
int *out_session_timeout)
{
const u8 *pmk = NULL;
u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
struct wpa_authenticator *wpa_auth = sm->wpa_auth;
const u8 *mdid = wpa_auth->conf.mobility_domain;
const u8 *r0kh = sm->r0kh_id;
size_t r0kh_len = sm->r0kh_id_len;
const u8 *r1kh = wpa_auth->conf.r1_key_holder;
const u8 *ssid = wpa_auth->conf.ssid;
size_t ssid_len = wpa_auth->conf.ssid_len;
int pairwise;
pairwise = sm->pairwise;
for (;;) {
pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
pmk);
if (pmk == NULL)
break;
if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
r0kh_len, sm->addr,
pmk_r0, pmk_r0_name, 0) < 0 ||
wpa_derive_pmk_r1(pmk_r0, PMK_LEN, pmk_r0_name, r1kh,
sm->addr, pmk_r1, pmk_r1_name) < 0 ||
os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
WPA_PMK_NAME_LEN) != 0)
continue;
/* We found a PSK that matches the requested pmk_r1_name */
wpa_printf(MSG_DEBUG,
"FT: Found PSK to generate PMK-R1 locally");
os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
if (out_pairwise)
*out_pairwise = pairwise;
os_memcpy(sm->PMK, pmk, PMK_LEN);
sm->pmk_len = PMK_LEN;
if (out_vlan &&
wpa_ft_get_vlan(sm->wpa_auth, sm->addr, out_vlan) < 0) {
wpa_printf(MSG_DEBUG, "FT: vlan not available for STA "
MACSTR, MAC2STR(sm->addr));
return -1;
}
if (out_identity && out_identity_len) {
*out_identity_len = wpa_ft_get_identity(
sm->wpa_auth, sm->addr, out_identity);
}
if (out_radius_cui && out_radius_cui_len) {
*out_radius_cui_len = wpa_ft_get_radius_cui(
sm->wpa_auth, sm->addr, out_radius_cui);
}
if (out_session_timeout) {
*out_session_timeout = wpa_ft_get_session_timeout(
sm->wpa_auth, sm->addr);
}
return 0;
}
wpa_printf(MSG_DEBUG,
"FT: Did not find PSK to generate PMK-R1 locally");
return -1;
}
/* Detect the configuration the station asked for.
* Required to detect FT-PSK and pairwise cipher.
*/
static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
struct wpa_ft_ies *parse)
{
int key_mgmt, ciphers;
if (sm->wpa_key_mgmt)
return 0;
key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
if (!key_mgmt) {
wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
return -1;
}
if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
#ifdef CONFIG_SHA384
else if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X_SHA384;
#endif /* CONFIG_SHA384 */
else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
#ifdef CONFIG_FILS
else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256)
sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA256;
else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384)
sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_FILS_SHA384;
#endif /* CONFIG_FILS */
ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
if (!ciphers) {
wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
MACSTR,
parse->pairwise_cipher, MAC2STR(sm->addr));
return -1;
}
sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
return 0;
}
static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
struct wpa_state_machine *sm,
const u8 *r0kh_id, size_t r0kh_id_len,
const u8 *req_pmk_r0_name,
const u8 *req_pmk_r1_name,
u8 *out_pmk_r1, int *out_pairwise,
struct vlan_description *vlan,
const u8 **identity, size_t *identity_len,
const u8 **radius_cui,
size_t *radius_cui_len,
int *out_session_timeout)
{
struct wpa_auth_config *conf = &wpa_auth->conf;
const struct wpa_ft_pmk_r0_sa *r0;
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
int expires_in = 0;
int session_timeout = 0;
struct os_reltime now;
if (conf->r0_key_holder_len != r0kh_id_len ||
os_memcmp(conf->r0_key_holder, r0kh_id, conf->r0_key_holder_len) !=
0)
return -1; /* not our R0KH-ID */
wpa_printf(MSG_DEBUG, "FT: STA R0KH-ID matching local configuration");
if (wpa_ft_fetch_pmk_r0(sm->wpa_auth, sm->addr, req_pmk_r0_name, &r0) <
0)
return -1; /* no matching PMKR0Name in local cache */
wpa_printf(MSG_DEBUG, "FT: Requested PMKR0Name found in local cache");
if (wpa_derive_pmk_r1(r0->pmk_r0, r0->pmk_r0_len, r0->pmk_r0_name,
conf->r1_key_holder,
sm->addr, out_pmk_r1, pmk_r1_name) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", out_pmk_r1, r0->pmk_r0_len);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
os_get_reltime(&now);
if (r0->expiration)
expires_in = r0->expiration - now.sec;
if (r0->session_timeout)
session_timeout = r0->session_timeout - now.sec;
wpa_ft_store_pmk_r1(wpa_auth, sm->addr, out_pmk_r1, r0->pmk_r0_len,
pmk_r1_name,
sm->pairwise, r0->vlan, expires_in, session_timeout,
r0->identity, r0->identity_len,
r0->radius_cui, r0->radius_cui_len);
*out_pairwise = sm->pairwise;
if (vlan) {
if (r0->vlan)
*vlan = *r0->vlan;
else
os_memset(vlan, 0, sizeof(*vlan));
}
if (identity && identity_len) {
*identity = r0->identity;
*identity_len = r0->identity_len;
}
if (radius_cui && radius_cui_len) {
*radius_cui = r0->radius_cui;
*radius_cui_len = r0->radius_cui_len;
}
*out_session_timeout = session_timeout;
return 0;
}
static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
const u8 *ies, size_t ies_len,
u8 **resp_ies, size_t *resp_ies_len)
{
struct rsn_mdie *mdie;
u8 pmk_r1[PMK_LEN_MAX], pmk_r1_name[WPA_PMK_NAME_LEN];
u8 ptk_name[WPA_PMK_NAME_LEN];
struct wpa_auth_config *conf;
struct wpa_ft_ies parse;
size_t buflen;
int ret;
u8 *pos, *end;
int pairwise, session_timeout = 0;
struct vlan_description vlan;
const u8 *identity, *radius_cui;
size_t identity_len = 0, radius_cui_len = 0;
int use_sha384;
size_t pmk_r1_len;
*resp_ies = NULL;
*resp_ies_len = 0;
sm->pmk_r1_name_valid = 0;
conf = &sm->wpa_auth->conf;
wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
ies, ies_len);
if (wpa_ft_parse_ies(ies, ies_len, &parse, -1)) {
wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
use_sha384 = wpa_key_mgmt_sha384(parse.key_mgmt);
pmk_r1_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
mdie = (struct rsn_mdie *) parse.mdie;
if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
os_memcmp(mdie->mobility_domain,
sm->wpa_auth->conf.mobility_domain,
MOBILITY_DOMAIN_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
return WLAN_STATUS_INVALID_MDIE;
}
if (use_sha384) {
struct rsn_ftie_sha384 *ftie;
ftie = (struct rsn_ftie_sha384 *) parse.ftie;
if (!ftie || parse.ftie_len < sizeof(*ftie)) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
return WLAN_STATUS_INVALID_FTIE;
}
os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
} else {
struct rsn_ftie *ftie;
ftie = (struct rsn_ftie *) parse.ftie;
if (!ftie || parse.ftie_len < sizeof(*ftie)) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
return WLAN_STATUS_INVALID_FTIE;
}
os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
}
if (parse.r0kh_id == NULL) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
return WLAN_STATUS_INVALID_FTIE;
}
wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
parse.r0kh_id, parse.r0kh_id_len);
os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
sm->r0kh_id_len = parse.r0kh_id_len;
if (parse.rsn_pmkid == NULL) {
wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
return WLAN_STATUS_INVALID_PMKID;
}
if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
parse.rsn_pmkid, WPA_PMK_NAME_LEN);
if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
sm->wpa_auth->conf.r1_key_holder, sm->addr,
pmk_r1_name, use_sha384) < 0)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
pmk_r1_name, WPA_PMK_NAME_LEN);
if (conf->ft_psk_generate_local &&
wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise,
&vlan, &identity, &identity_len,
&radius_cui, &radius_cui_len,
&session_timeout) < 0)
return WLAN_STATUS_INVALID_PMKID;
wpa_printf(MSG_DEBUG,
"FT: Generated PMK-R1 for FT-PSK locally");
} else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
pmk_r1, &pmk_r1_len, &pairwise, &vlan,
&identity, &identity_len, &radius_cui,
&radius_cui_len, &session_timeout) < 0) {
wpa_printf(MSG_DEBUG,
"FT: No PMK-R1 available in local cache for the requested PMKR1Name");
if (wpa_ft_local_derive_pmk_r1(sm->wpa_auth, sm,
parse.r0kh_id, parse.r0kh_id_len,
parse.rsn_pmkid,
pmk_r1_name, pmk_r1, &pairwise,
&vlan, &identity, &identity_len,
&radius_cui, &radius_cui_len,
&session_timeout) == 0) {
wpa_printf(MSG_DEBUG,
"FT: Generated PMK-R1 based on local PMK-R0");
goto pmk_r1_derived;
}
if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
wpa_printf(MSG_DEBUG,
"FT: Did not have matching PMK-R1 and either unknown or blocked R0KH-ID or NAK from R0KH");
return WLAN_STATUS_INVALID_PMKID;
}
return -1; /* Status pending */
} else {
wpa_printf(MSG_DEBUG, "FT: Found PMKR1Name from local cache");
}
pmk_r1_derived:
wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, pmk_r1_len);
sm->pmk_r1_name_valid = 1;
os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
"ANonce");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
sm->SNonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
sm->ANonce, WPA_NONCE_LEN);
if (wpa_pmk_r1_to_ptk(pmk_r1, pmk_r1_len, sm->SNonce, sm->ANonce,
sm->addr, sm->wpa_auth->addr, pmk_r1_name,
&sm->PTK, ptk_name, sm->wpa_key_mgmt,
pairwise) < 0)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
sm->pairwise = pairwise;
sm->PTK_valid = TRUE;
sm->tk_already_set = FALSE;
wpa_ft_install_ptk(sm);
if (wpa_ft_set_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to configure VLAN");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
if (wpa_ft_set_identity(sm->wpa_auth, sm->addr,
identity, identity_len) < 0 ||
wpa_ft_set_radius_cui(sm->wpa_auth, sm->addr,
radius_cui, radius_cui_len) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to configure identity/CUI");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
wpa_ft_set_session_timeout(sm->wpa_auth, sm->addr, session_timeout);
buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
2 + FT_R1KH_ID_LEN + 200;
*resp_ies = os_zalloc(buflen);
if (*resp_ies == NULL)
goto fail;
pos = *resp_ies;
end = *resp_ies + buflen;
ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
if (ret < 0)
goto fail;
pos += ret;
ret = wpa_write_mdie(conf, pos, end - pos);
if (ret < 0)
goto fail;
pos += ret;
ret = wpa_write_ftie(conf, use_sha384, parse.r0kh_id, parse.r0kh_id_len,
sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
if (ret < 0)
goto fail;
pos += ret;
*resp_ies_len = pos - *resp_ies;
return WLAN_STATUS_SUCCESS;
fail:
os_free(*resp_ies);
*resp_ies = NULL;
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
u16 auth_transaction, const u8 *ies, size_t ies_len,
void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
u16 auth_transaction, u16 status,
const u8 *ies, size_t ies_len),
void *ctx)
{
u16 status;
u8 *resp_ies;
size_t resp_ies_len;
int res;
if (sm == NULL) {
wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
"WPA SM not available");
return;
}
wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
" BSSID=" MACSTR " transaction=%d",
MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
sm->ft_pending_cb = cb;
sm->ft_pending_cb_ctx = ctx;
sm->ft_pending_auth_transaction = auth_transaction;
sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
&resp_ies_len);
if (res < 0) {
wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
return;
}
status = res;
wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
" auth_transaction=%d status=%d",
MAC2STR(sm->addr), auth_transaction + 1, status);
wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
resp_ies, resp_ies_len);
os_free(resp_ies);
}
u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
size_t ies_len)
{
struct wpa_ft_ies parse;
struct rsn_mdie *mdie;
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
size_t mic_len = 16;
unsigned int count;
const u8 *kck;
size_t kck_len;
int use_sha384;
const u8 *anonce, *snonce, *fte_mic;
u8 fte_elem_count;
if (sm == NULL)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
if (parse.rsn == NULL) {
wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
if (parse.rsn_pmkid == NULL) {
wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
return WLAN_STATUS_INVALID_PMKID;
}
if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
!= 0) {
wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
"with the PMKR1Name derived from auth request");
return WLAN_STATUS_INVALID_PMKID;
}
mdie = (struct rsn_mdie *) parse.mdie;
if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
os_memcmp(mdie->mobility_domain,
sm->wpa_auth->conf.mobility_domain,
MOBILITY_DOMAIN_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
return WLAN_STATUS_INVALID_MDIE;
}
if (use_sha384) {
struct rsn_ftie_sha384 *ftie;
ftie = (struct rsn_ftie_sha384 *) parse.ftie;
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
return WLAN_STATUS_INVALID_FTIE;
}
anonce = ftie->anonce;
snonce = ftie->snonce;
fte_elem_count = ftie->mic_control[1];
fte_mic = ftie->mic;
} else {
struct rsn_ftie *ftie;
ftie = (struct rsn_ftie *) parse.ftie;
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
return WLAN_STATUS_INVALID_FTIE;
}
anonce = ftie->anonce;
snonce = ftie->snonce;
fte_elem_count = ftie->mic_control[1];
fte_mic = ftie->mic;
}
if (os_memcmp(snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
snonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
sm->SNonce, WPA_NONCE_LEN);
return WLAN_STATUS_INVALID_FTIE;
}
if (os_memcmp(anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
anonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
sm->ANonce, WPA_NONCE_LEN);
return WLAN_STATUS_INVALID_FTIE;
}
if (parse.r0kh_id == NULL) {
wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
return WLAN_STATUS_INVALID_FTIE;
}
if (parse.r0kh_id_len != sm->r0kh_id_len ||
os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
{
wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
"the current R0KH-ID");
wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
parse.r0kh_id, parse.r0kh_id_len);
wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
sm->r0kh_id, sm->r0kh_id_len);
return WLAN_STATUS_INVALID_FTIE;
}
if (parse.r1kh_id == NULL) {
wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
return WLAN_STATUS_INVALID_FTIE;
}
if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
FT_R1KH_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
"ReassocReq");
wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
parse.r1kh_id, FT_R1KH_ID_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
return WLAN_STATUS_INVALID_FTIE;
}
if (parse.rsn_pmkid == NULL ||
os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
{
wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
"RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
return WLAN_STATUS_INVALID_PMKID;
}
count = 3;
if (parse.ric)
count += ieee802_11_ie_count(parse.ric, parse.ric_len);
if (fte_elem_count != count) {
wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
"Control: received %u expected %u",
fte_elem_count, count);
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
if (wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
kck = sm->PTK.kck2;
kck_len = sm->PTK.kck2_len;
} else {
kck = sm->PTK.kck;
kck_len = sm->PTK.kck_len;
}
if (wpa_ft_mic(kck, kck_len, sm->addr, sm->wpa_auth->addr, 5,
parse.mdie - 2, parse.mdie_len + 2,
parse.ftie - 2, parse.ftie_len + 2,
parse.rsn - 2, parse.rsn_len + 2,
parse.ric, parse.ric_len,
mic) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
if (os_memcmp_const(mic, fte_mic, mic_len) != 0) {
wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
fte_mic, mic_len);
wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
parse.mdie - 2, parse.mdie_len + 2);
wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
parse.ftie - 2, parse.ftie_len + 2);
wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
parse.rsn - 2, parse.rsn_len + 2);
return WLAN_STATUS_INVALID_FTIE;
}
#ifdef CONFIG_OCV
if (wpa_auth_uses_ocv(sm)) {
struct wpa_channel_info ci;
int tx_chanwidth;
int tx_seg1_idx;
if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
wpa_printf(MSG_WARNING,
"Failed to get channel info to validate received OCI in (Re)Assoc Request");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
if (get_sta_tx_parameters(sm,
channel_width_to_int(ci.chanwidth),
ci.seg1_idx, &tx_chanwidth,
&tx_seg1_idx) < 0)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
tx_chanwidth, tx_seg1_idx) != 0) {
wpa_printf(MSG_WARNING, "%s", ocv_errorstr);
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
}
#endif /* CONFIG_OCV */
return WLAN_STATUS_SUCCESS;
}
int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
{
const u8 *sta_addr, *target_ap;
const u8 *ies;
size_t ies_len;
u8 action;
struct ft_rrb_frame *frame;
if (sm == NULL)
return -1;
/*
* data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
* FT Request action frame body[variable]
*/
if (len < 14) {
wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
"(len=%lu)", (unsigned long) len);
return -1;
}
action = data[1];
sta_addr = data + 2;
target_ap = data + 8;
ies = data + 14;
ies_len = len - 14;
wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
" Target AP=" MACSTR " Action=%d)",
MAC2STR(sta_addr), MAC2STR(target_ap), action);
if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
"STA=" MACSTR " STA-Address=" MACSTR,
MAC2STR(sm->addr), MAC2STR(sta_addr));
return -1;
}
/*
* Do some sanity checking on the target AP address (not own and not
* broadcast. This could be extended to filter based on a list of known
* APs in the MD (if such a list were configured).
*/
if ((target_ap[0] & 0x01) ||
os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
"frame");
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
if (!sm->wpa_auth->conf.ft_over_ds) {
wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
return -1;
}
/* RRB - Forward action frame to the target AP */
frame = os_malloc(sizeof(*frame) + len);
if (frame == NULL)
return -1;
frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
frame->packet_type = FT_PACKET_REQUEST;
frame->action_length = host_to_le16(len);
os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
os_memcpy(frame + 1, data, len);
wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
sizeof(*frame) + len);
os_free(frame);
return 0;
}
static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
u16 auth_transaction, u16 resp,
const u8 *ies, size_t ies_len)
{
struct wpa_state_machine *sm = ctx;
wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
MAC2STR(sm->addr));
wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
WLAN_STATUS_SUCCESS, ies, ies_len);
}
static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
const u8 *current_ap, const u8 *sta_addr,
const u8 *body, size_t len)
{
struct wpa_state_machine *sm;
u16 status;
u8 *resp_ies;
size_t resp_ies_len;
int res;
sm = wpa_ft_add_sta(wpa_auth, sta_addr);
if (sm == NULL) {
wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
"RRB Request");
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
sm->ft_pending_cb_ctx = sm;
os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
sm->ft_pending_pull_left_retries = sm->wpa_auth->conf.rkh_pull_retries;
res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
&resp_ies_len);
if (res < 0) {
wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
return 0;
}
status = res;
res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
resp_ies, resp_ies_len);
os_free(resp_ies);
return res;
}
static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
const u8 *current_ap, const u8 *sta_addr,
u16 status, const u8 *resp_ies,
size_t resp_ies_len)
{
struct wpa_authenticator *wpa_auth = sm->wpa_auth;
size_t rlen;
struct ft_rrb_frame *frame;
u8 *pos;
wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
" CurrentAP=" MACSTR " status=%d",
MAC2STR(sm->addr), MAC2STR(current_ap), status);
wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
/* RRB - Forward action frame response to the Current AP */
/*
* data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
* Status_Code[2] FT Request action frame body[variable]
*/
rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
frame = os_malloc(sizeof(*frame) + rlen);
if (frame == NULL)
return -1;
frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
frame->packet_type = FT_PACKET_RESPONSE;
frame->action_length = host_to_le16(rlen);
os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
pos = (u8 *) (frame + 1);
*pos++ = WLAN_ACTION_FT;
*pos++ = 2; /* Action: Response */
os_memcpy(pos, sta_addr, ETH_ALEN);
pos += ETH_ALEN;
os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
pos += ETH_ALEN;
WPA_PUT_LE16(pos, status);
pos += 2;
if (resp_ies)
os_memcpy(pos, resp_ies, resp_ies_len);
wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
sizeof(*frame) + rlen);
os_free(frame);
return 0;
}
static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
const struct tlv_list *tlvs,
const struct wpa_ft_pmk_r0_sa *pmk_r0,
const u8 *r1kh_id, const u8 *s1kh_id,
const struct tlv_list *tlv_auth,
const u8 *src_addr, u8 type,
u8 **packet, size_t *packet_len)
{
u8 pmk_r1[PMK_LEN_MAX];
size_t pmk_r1_len = pmk_r0->pmk_r0_len;
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
u8 f_pairwise[sizeof(le16)];
u8 f_expires_in[sizeof(le16)];
u8 f_session_timeout[sizeof(le32)];
int expires_in;
int session_timeout;
struct os_reltime now;
int ret;
struct tlv_list sess_tlv[] = {
{ .type = FT_RRB_PMK_R1, .len = pmk_r1_len,
.data = pmk_r1 },
{ .type = FT_RRB_PMK_R1_NAME, .len = sizeof(pmk_r1_name),
.data = pmk_r1_name },
{ .type = FT_RRB_PAIRWISE, .len = sizeof(f_pairwise),
.data = f_pairwise },
{ .type = FT_RRB_EXPIRES_IN, .len = sizeof(f_expires_in),
.data = f_expires_in },
{ .type = FT_RRB_IDENTITY, .len = pmk_r0->identity_len,
.data = pmk_r0->identity },
{ .type = FT_RRB_RADIUS_CUI, .len = pmk_r0->radius_cui_len,
.data = pmk_r0->radius_cui },
{ .type = FT_RRB_SESSION_TIMEOUT,
.len = sizeof(f_session_timeout),
.data = f_session_timeout },
{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
};
if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_len,
pmk_r0->pmk_r0_name, r1kh_id,
s1kh_id, pmk_r1, pmk_r1_name) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 (for peer AP)",
pmk_r1, pmk_r1_len);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name (for peer AP)",
pmk_r1_name, WPA_PMK_NAME_LEN);
WPA_PUT_LE16(f_pairwise, pmk_r0->pairwise);
os_get_reltime(&now);
if (pmk_r0->expiration > now.sec)
expires_in = pmk_r0->expiration - now.sec;
else if (pmk_r0->expiration)
expires_in = 1;
else
expires_in = 0;
WPA_PUT_LE16(f_expires_in, expires_in);
if (pmk_r0->session_timeout > now.sec)
session_timeout = pmk_r0->session_timeout - now.sec;
else if (pmk_r0->session_timeout)
session_timeout = 1;
else
session_timeout = 0;
WPA_PUT_LE32(f_session_timeout, session_timeout);
ret = wpa_ft_rrb_build(key, key_len, tlvs, sess_tlv, tlv_auth,
pmk_r0->vlan, src_addr, type,
packet, packet_len);
os_memset(pmk_r1, 0, sizeof(pmk_r1));
return ret;
}
static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int no_defer)
{
const char *msgtype = "pull request";
u8 *plain = NULL, *packet = NULL;
size_t plain_len = 0, packet_len = 0;
struct ft_remote_r1kh *r1kh, *r1kh_wildcard;
const u8 *key;
size_t key_len;
int seq_ret;
const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id, *f_s1kh_id, *f_pmk_r0_name;
size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len, f_s1kh_id_len;
size_t f_pmk_r0_name_len;
const struct wpa_ft_pmk_r0_sa *r0;
int ret;
struct tlv_list resp[2];
struct tlv_list resp_auth[5];
struct ft_rrb_seq f_seq;
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
if (wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len)) {
wpa_printf(MSG_DEBUG, "FT: R0KH-ID mismatch");
goto out;
}
RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh, &r1kh_wildcard);
if (r1kh) {
key = r1kh->key;
key_len = sizeof(r1kh->key);
} else if (r1kh_wildcard) {
wpa_printf(MSG_DEBUG, "FT: Using wildcard R1KH-ID");
key = r1kh_wildcard->key;
key_len = sizeof(r1kh_wildcard->key);
} else {
goto out;
}
RRB_GET_AUTH(FT_RRB_NONCE, nonce, "pull request", FT_RRB_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
seq_ret = FT_RRB_SEQ_DROP;
if (r1kh)
seq_ret = wpa_ft_rrb_seq_chk(r1kh->seq, src_addr, enc, enc_len,
auth, auth_len, msgtype, no_defer);
if (!no_defer && r1kh_wildcard &&
(!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
/* wildcard: r1kh-id unknown or changed addr -> do a seq req */
seq_ret = FT_RRB_SEQ_DEFER;
}
if (seq_ret == FT_RRB_SEQ_DROP)
goto out;
if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
src_addr, FT_PACKET_R0KH_R1KH_PULL,
&plain, &plain_len) < 0)
goto out;
if (!r1kh)
r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard, src_addr,
f_r1kh_id,
wpa_auth->conf.rkh_pos_timeout);
if (!r1kh)
goto out;
if (seq_ret == FT_RRB_SEQ_DEFER) {
wpa_ft_rrb_seq_req(wpa_auth, r1kh->seq, src_addr, f_r0kh_id,
f_r0kh_id_len, f_r1kh_id, key, key_len,
enc, enc_len, auth, auth_len,
&wpa_ft_rrb_rx_pull);
goto out;
}
wpa_ft_rrb_seq_accept(wpa_auth, r1kh->seq, src_addr, auth, auth_len,
msgtype);
wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
wpa_auth->conf.rkh_pos_timeout);
RRB_GET(FT_RRB_PMK_R0_NAME, pmk_r0_name, msgtype, WPA_PMK_NAME_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", f_pmk_r0_name,
f_pmk_r0_name_len);
RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
goto out;
}
resp[0].type = FT_RRB_S1KH_ID;
resp[0].len = f_s1kh_id_len;
resp[0].data = f_s1kh_id;
resp[1].type = FT_RRB_LAST_EMPTY;
resp[1].len = 0;
resp[1].data = NULL;
resp_auth[0].type = FT_RRB_NONCE;
resp_auth[0].len = f_nonce_len;
resp_auth[0].data = f_nonce;
resp_auth[1].type = FT_RRB_SEQ;
resp_auth[1].len = sizeof(f_seq);
resp_auth[1].data = (u8 *) &f_seq;
resp_auth[2].type = FT_RRB_R0KH_ID;
resp_auth[2].len = f_r0kh_id_len;
resp_auth[2].data = f_r0kh_id;
resp_auth[3].type = FT_RRB_R1KH_ID;
resp_auth[3].len = f_r1kh_id_len;
resp_auth[3].data = f_r1kh_id;
resp_auth[4].type = FT_RRB_LAST_EMPTY;
resp_auth[4].len = 0;
resp_auth[4].data = NULL;
if (wpa_ft_fetch_pmk_r0(wpa_auth, f_s1kh_id, f_pmk_r0_name, &r0) < 0) {
wpa_printf(MSG_DEBUG, "FT: No matching PMK-R0-Name found");
ret = wpa_ft_rrb_build(key, key_len, resp, NULL, resp_auth,
NULL, wpa_auth->addr,
FT_PACKET_R0KH_R1KH_RESP,
&packet, &packet_len);
} else {
ret = wpa_ft_rrb_build_r0(key, key_len, resp, r0, f_r1kh_id,
f_s1kh_id, resp_auth, wpa_auth->addr,
FT_PACKET_R0KH_R1KH_RESP,
&packet, &packet_len);
}
if (!ret)
wpa_ft_rrb_oui_send(wpa_auth, src_addr,
FT_PACKET_R0KH_R1KH_RESP, packet,
packet_len);
out:
os_free(plain);
os_free(packet);
return 0;
}
/* @returns 0 on success
* -1 on error
* -2 if FR_RRB_PAIRWISE is missing
*/
static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
const u8 *src_addr, u8 type,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
const char *msgtype, u8 *s1kh_id_out,
int (*cb)(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int no_defer))
{
u8 *plain = NULL;
size_t plain_len = 0;
struct ft_remote_r0kh *r0kh, *r0kh_wildcard;
const u8 *key;
size_t key_len;
int seq_ret;
const u8 *f_r1kh_id, *f_s1kh_id, *f_r0kh_id;
const u8 *f_pmk_r1_name, *f_pairwise, *f_pmk_r1;
const u8 *f_expires_in;
size_t f_r1kh_id_len, f_s1kh_id_len, f_r0kh_id_len;
const u8 *f_identity, *f_radius_cui;
const u8 *f_session_timeout;
size_t f_pmk_r1_name_len, f_pairwise_len, f_pmk_r1_len;
size_t f_expires_in_len;
size_t f_identity_len, f_radius_cui_len;
size_t f_session_timeout_len;
int pairwise;
int ret = -1;
int expires_in;
int session_timeout;
struct vlan_description vlan;
size_t pmk_r1_len;
RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", f_r0kh_id, f_r0kh_id_len);
RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, msgtype, FT_R1KH_ID_LEN);
wpa_printf(MSG_DEBUG, "FT: R1KH-ID=" MACSTR, MAC2STR(f_r1kh_id));
if (wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id)) {
wpa_printf(MSG_DEBUG, "FT: R1KH-ID mismatch");
goto out;
}
wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len, &r0kh,
&r0kh_wildcard);
if (r0kh) {
key = r0kh->key;
key_len = sizeof(r0kh->key);
} else if (r0kh_wildcard) {
wpa_printf(MSG_DEBUG, "FT: Using wildcard R0KH-ID");
key = r0kh_wildcard->key;
key_len = sizeof(r0kh_wildcard->key);
} else {
goto out;
}
seq_ret = FT_RRB_SEQ_DROP;
if (r0kh) {
seq_ret = wpa_ft_rrb_seq_chk(r0kh->seq, src_addr, enc, enc_len,
auth, auth_len, msgtype,
cb ? 0 : 1);
}
if (cb && r0kh_wildcard &&
(!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
/* wildcard: r0kh-id unknown or changed addr -> do a seq req */
seq_ret = FT_RRB_SEQ_DEFER;
}
if (seq_ret == FT_RRB_SEQ_DROP)
goto out;
if (wpa_ft_rrb_decrypt(key, key_len, enc, enc_len, auth, auth_len,
src_addr, type, &plain, &plain_len) < 0)
goto out;
if (!r0kh)
r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard, src_addr,
f_r0kh_id, f_r0kh_id_len,
wpa_auth->conf.rkh_pos_timeout);
if (!r0kh)
goto out;
if (seq_ret == FT_RRB_SEQ_DEFER) {
wpa_ft_rrb_seq_req(wpa_auth, r0kh->seq, src_addr, f_r0kh_id,
f_r0kh_id_len, f_r1kh_id, key, key_len,
enc, enc_len, auth, auth_len, cb);
goto out;
}
wpa_ft_rrb_seq_accept(wpa_auth, r0kh->seq, src_addr, auth, auth_len,
msgtype);
wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
wpa_auth->conf.rkh_pos_timeout);
RRB_GET(FT_RRB_S1KH_ID, s1kh_id, msgtype, ETH_ALEN);
wpa_printf(MSG_DEBUG, "FT: S1KH-ID=" MACSTR, MAC2STR(f_s1kh_id));
if (s1kh_id_out)
os_memcpy(s1kh_id_out, f_s1kh_id, ETH_ALEN);
ret = -2;
RRB_GET(FT_RRB_PAIRWISE, pairwise, msgtype, sizeof(le16));
wpa_hexdump(MSG_DEBUG, "FT: pairwise", f_pairwise, f_pairwise_len);
ret = -1;
RRB_GET(FT_RRB_PMK_R1_NAME, pmk_r1_name, msgtype, WPA_PMK_NAME_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
f_pmk_r1_name, WPA_PMK_NAME_LEN);
pmk_r1_len = PMK_LEN;
if (wpa_ft_rrb_get_tlv(plain, plain_len, FT_RRB_PMK_R1, &f_pmk_r1_len,
&f_pmk_r1) == 0 &&
(f_pmk_r1_len == PMK_LEN || f_pmk_r1_len == SHA384_MAC_LEN))
pmk_r1_len = f_pmk_r1_len;
RRB_GET(FT_RRB_PMK_R1, pmk_r1, msgtype, pmk_r1_len);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f_pmk_r1, pmk_r1_len);
pairwise = WPA_GET_LE16(f_pairwise);
RRB_GET_OPTIONAL(FT_RRB_EXPIRES_IN, expires_in, msgtype,
sizeof(le16));
if (f_expires_in)
expires_in = WPA_GET_LE16(f_expires_in);
else
expires_in = 0;
wpa_printf(MSG_DEBUG, "FT: PMK-R1 %s - expires_in=%d", msgtype,
expires_in);
if (wpa_ft_rrb_get_tlv_vlan(plain, plain_len, &vlan) < 0) {
wpa_printf(MSG_DEBUG, "FT: Cannot parse vlan");
wpa_ft_rrb_dump(plain, plain_len);
goto out;
}
wpa_printf(MSG_DEBUG, "FT: vlan %d%s",
le_to_host16(vlan.untagged), vlan.tagged[0] ? "+" : "");
RRB_GET_OPTIONAL(FT_RRB_IDENTITY, identity, msgtype, -1);
if (f_identity)
wpa_hexdump_ascii(MSG_DEBUG, "FT: Identity", f_identity,
f_identity_len);
RRB_GET_OPTIONAL(FT_RRB_RADIUS_CUI, radius_cui, msgtype, -1);
if (f_radius_cui)
wpa_hexdump_ascii(MSG_DEBUG, "FT: CUI", f_radius_cui,
f_radius_cui_len);
RRB_GET_OPTIONAL(FT_RRB_SESSION_TIMEOUT, session_timeout, msgtype,
sizeof(le32));
if (f_session_timeout)
session_timeout = WPA_GET_LE32(f_session_timeout);
else
session_timeout = 0;
wpa_printf(MSG_DEBUG, "FT: session_timeout %d", session_timeout);
if (wpa_ft_store_pmk_r1(wpa_auth, f_s1kh_id, f_pmk_r1, pmk_r1_len,
f_pmk_r1_name,
pairwise, &vlan, expires_in, session_timeout,
f_identity, f_identity_len, f_radius_cui,
f_radius_cui_len) < 0)
goto out;
ret = 0;
out:
if (plain) {
os_memset(plain, 0, plain_len);
os_free(plain);
}
return ret;
}
static void ft_finish_pull(struct wpa_state_machine *sm)
{
int res;
u8 *resp_ies;
size_t resp_ies_len;
u16 status;
if (!sm->ft_pending_cb || !sm->ft_pending_req_ies)
return;
res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
wpabuf_len(sm->ft_pending_req_ies),
&resp_ies, &resp_ies_len);
if (res < 0) {
/* this loop is broken by ft_pending_pull_left_retries */
wpa_printf(MSG_DEBUG,
"FT: Callback postponed until response is available");
return;
}
wpabuf_free(sm->ft_pending_req_ies);
sm->ft_pending_req_ies = NULL;
status = res;
wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
" - status %u", MAC2STR(sm->addr), status);
sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
sm->ft_pending_auth_transaction + 1, status,
resp_ies, resp_ies_len);
os_free(resp_ies);
}
struct ft_get_sta_ctx {
const u8 *nonce;
const u8 *s1kh_id;
struct wpa_state_machine *sm;
};
static int ft_get_sta_cb(struct wpa_state_machine *sm, void *ctx)
{
struct ft_get_sta_ctx *info = ctx;
if ((info->s1kh_id &&
os_memcmp(info->s1kh_id, sm->addr, ETH_ALEN) != 0) ||
os_memcmp(info->nonce, sm->ft_pending_pull_nonce,
FT_RRB_NONCE_LEN) != 0 ||
sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
return 0;
info->sm = sm;
return 1;
}
static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int no_defer)
{
const char *msgtype = "pull response";
int nak, ret = -1;
struct ft_get_sta_ctx ctx;
u8 s1kh_id[ETH_ALEN];
const u8 *f_nonce;
size_t f_nonce_len;
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
RRB_GET_AUTH(FT_RRB_NONCE, nonce, msgtype, FT_RRB_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: nonce", f_nonce, f_nonce_len);
os_memset(&ctx, 0, sizeof(ctx));
ctx.nonce = f_nonce;
if (!wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
/* nonce not found */
wpa_printf(MSG_DEBUG, "FT: Invalid nonce");
return -1;
}
ret = wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_RESP,
enc, enc_len, auth, auth_len, msgtype, s1kh_id,
no_defer ? NULL : &wpa_ft_rrb_rx_resp);
if (ret == -2) {
ret = 0;
nak = 1;
} else {
nak = 0;
}
if (ret < 0)
return -1;
ctx.s1kh_id = s1kh_id;
if (wpa_auth_for_each_sta(wpa_auth, ft_get_sta_cb, &ctx)) {
wpa_printf(MSG_DEBUG,
"FT: Response to a pending pull request for " MACSTR,
MAC2STR(ctx.sm->addr));
eloop_cancel_timeout(wpa_ft_expire_pull, ctx.sm, NULL);
if (nak)
ctx.sm->ft_pending_pull_left_retries = 0;
ft_finish_pull(ctx.sm);
}
out:
return ret;
}
static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len, int no_defer)
{
const char *msgtype = "push";
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
if (wpa_ft_rrb_rx_r1(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_PUSH,
enc, enc_len, auth, auth_len, msgtype, NULL,
no_defer ? NULL : wpa_ft_rrb_rx_push) < 0)
return -1;
return 0;
}
static int wpa_ft_rrb_rx_seq(struct wpa_authenticator *wpa_auth,
const u8 *src_addr, int type,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
struct ft_remote_seq **rkh_seq,
u8 **key, size_t *key_len,
struct ft_remote_r0kh **r0kh_out,
struct ft_remote_r1kh **r1kh_out,
struct ft_remote_r0kh **r0kh_wildcard_out,
struct ft_remote_r1kh **r1kh_wildcard_out)
{
struct ft_remote_r0kh *r0kh = NULL;
struct ft_remote_r1kh *r1kh = NULL;
const u8 *f_r0kh_id, *f_r1kh_id;
size_t f_r0kh_id_len, f_r1kh_id_len;
int to_r0kh, to_r1kh;
u8 *plain = NULL;
size_t plain_len = 0;
struct ft_remote_r0kh *r0kh_wildcard;
struct ft_remote_r1kh *r1kh_wildcard;
RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
to_r0kh = !wpa_ft_rrb_check_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len);
to_r1kh = !wpa_ft_rrb_check_r1kh(wpa_auth, f_r1kh_id);
if (to_r0kh && to_r1kh) {
wpa_printf(MSG_DEBUG, "FT: seq - local R0KH-ID and R1KH-ID");
goto out;
}
if (!to_r0kh && !to_r1kh) {
wpa_printf(MSG_DEBUG, "FT: seq - remote R0KH-ID and R1KH-ID");
goto out;
}
if (!to_r0kh) {
wpa_ft_rrb_lookup_r0kh(wpa_auth, f_r0kh_id, f_r0kh_id_len,
&r0kh, &r0kh_wildcard);
if (!r0kh_wildcard &&
(!r0kh || os_memcmp(r0kh->addr, src_addr, ETH_ALEN) != 0)) {
wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
f_r0kh_id, f_r0kh_id_len);
goto out;
}
if (r0kh) {
*key = r0kh->key;
*key_len = sizeof(r0kh->key);
} else {
*key = r0kh_wildcard->key;
*key_len = sizeof(r0kh_wildcard->key);
}
}
if (!to_r1kh) {
wpa_ft_rrb_lookup_r1kh(wpa_auth, f_r1kh_id, &r1kh,
&r1kh_wildcard);
if (!r1kh_wildcard &&
(!r1kh || os_memcmp(r1kh->addr, src_addr, ETH_ALEN) != 0)) {
wpa_hexdump(MSG_DEBUG, "FT: Did not find R1KH-ID",
f_r1kh_id, FT_R1KH_ID_LEN);
goto out;
}
if (r1kh) {
*key = r1kh->key;
*key_len = sizeof(r1kh->key);
} else {
*key = r1kh_wildcard->key;
*key_len = sizeof(r1kh_wildcard->key);
}
}
if (wpa_ft_rrb_decrypt(*key, *key_len, enc, enc_len, auth, auth_len,
src_addr, type, &plain, &plain_len) < 0)
goto out;
os_free(plain);
if (!to_r0kh) {
if (!r0kh)
r0kh = wpa_ft_rrb_add_r0kh(wpa_auth, r0kh_wildcard,
src_addr, f_r0kh_id,
f_r0kh_id_len,
ftRRBseqTimeout);
if (!r0kh)
goto out;
wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh, ftRRBseqTimeout);
*rkh_seq = r0kh->seq;
if (r0kh_out)
*r0kh_out = r0kh;
if (r0kh_wildcard_out)
*r0kh_wildcard_out = r0kh_wildcard;
}
if (!to_r1kh) {
if (!r1kh)
r1kh = wpa_ft_rrb_add_r1kh(wpa_auth, r1kh_wildcard,
src_addr, f_r1kh_id,
ftRRBseqTimeout);
if (!r1kh)
goto out;
wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh, ftRRBseqTimeout);
*rkh_seq = r1kh->seq;
if (r1kh_out)
*r1kh_out = r1kh;
if (r1kh_wildcard_out)
*r1kh_wildcard_out = r1kh_wildcard;
}
return 0;
out:
return -1;
}
static int wpa_ft_rrb_rx_seq_req(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int no_defer)
{
int ret = -1;
struct ft_rrb_seq f_seq;
const u8 *f_nonce, *f_r0kh_id, *f_r1kh_id;
size_t f_nonce_len, f_r0kh_id_len, f_r1kh_id_len;
struct ft_remote_seq *rkh_seq = NULL;
u8 *packet = NULL, *key = NULL;
size_t packet_len = 0, key_len = 0;
struct tlv_list seq_resp_auth[5];
wpa_printf(MSG_DEBUG, "FT: Received sequence number request");
if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_REQ,
enc, enc_len, auth, auth_len, &rkh_seq, &key,
&key_len, NULL, NULL, NULL, NULL) < 0)
goto out;
RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq request", FT_RRB_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: seq request - nonce", f_nonce, f_nonce_len);
RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, "seq", -1);
RRB_GET_AUTH(FT_RRB_R1KH_ID, r1kh_id, "seq", FT_R1KH_ID_LEN);
if (wpa_ft_new_seq(rkh_seq, &f_seq) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
goto out;
}
seq_resp_auth[0].type = FT_RRB_NONCE;
seq_resp_auth[0].len = f_nonce_len;
seq_resp_auth[0].data = f_nonce;
seq_resp_auth[1].type = FT_RRB_SEQ;
seq_resp_auth[1].len = sizeof(f_seq);
seq_resp_auth[1].data = (u8 *) &f_seq;
seq_resp_auth[2].type = FT_RRB_R0KH_ID;
seq_resp_auth[2].len = f_r0kh_id_len;
seq_resp_auth[2].data = f_r0kh_id;
seq_resp_auth[3].type = FT_RRB_R1KH_ID;
seq_resp_auth[3].len = FT_R1KH_ID_LEN;
seq_resp_auth[3].data = f_r1kh_id;
seq_resp_auth[4].type = FT_RRB_LAST_EMPTY;
seq_resp_auth[4].len = 0;
seq_resp_auth[4].data = NULL;
if (wpa_ft_rrb_build(key, key_len, NULL, NULL, seq_resp_auth, NULL,
wpa_auth->addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
&packet, &packet_len) < 0)
goto out;
wpa_ft_rrb_oui_send(wpa_auth, src_addr,
FT_PACKET_R0KH_R1KH_SEQ_RESP, packet,
packet_len);
out:
os_free(packet);
return ret;
}
static int wpa_ft_rrb_rx_seq_resp(struct wpa_authenticator *wpa_auth,
const u8 *src_addr,
const u8 *enc, size_t enc_len,
const u8 *auth, size_t auth_len,
int no_defer)
{
u8 *key = NULL;
size_t key_len = 0;
struct ft_remote_r0kh *r0kh = NULL, *r0kh_wildcard = NULL;
struct ft_remote_r1kh *r1kh = NULL, *r1kh_wildcard = NULL;
const u8 *f_nonce, *f_seq;
size_t f_nonce_len, f_seq_len;
struct ft_remote_seq *rkh_seq = NULL;
struct ft_remote_item *item;
struct os_reltime now, now_remote;
int seq_ret, found;
const struct ft_rrb_seq *msg_both;
u32 msg_dom, msg_seq;
wpa_printf(MSG_DEBUG, "FT: Received sequence number response");
if (wpa_ft_rrb_rx_seq(wpa_auth, src_addr, FT_PACKET_R0KH_R1KH_SEQ_RESP,
enc, enc_len, auth, auth_len, &rkh_seq, &key,
&key_len, &r0kh, &r1kh, &r0kh_wildcard,
&r1kh_wildcard) < 0)
goto out;
RRB_GET_AUTH(FT_RRB_NONCE, nonce, "seq response", FT_RRB_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: seq response - nonce", f_nonce,
f_nonce_len);
found = 0;
dl_list_for_each(item, &rkh_seq->rx.queue, struct ft_remote_item,
list) {
if (os_memcmp_const(f_nonce, item->nonce,
FT_RRB_NONCE_LEN) != 0 ||
os_get_reltime(&now) < 0 ||
os_reltime_expired(&now, &item->nonce_ts, ftRRBseqTimeout))
continue;
found = 1;
break;
}
if (!found) {
wpa_printf(MSG_DEBUG, "FT: seq response - bad nonce");
goto out;
}
if (r0kh) {
wpa_ft_rrb_r0kh_replenish(wpa_auth, r0kh,
wpa_auth->conf.rkh_pos_timeout);
if (r0kh_wildcard)
os_memcpy(r0kh->addr, src_addr, ETH_ALEN);
}
if (r1kh) {
wpa_ft_rrb_r1kh_replenish(wpa_auth, r1kh,
wpa_auth->conf.rkh_pos_timeout);
if (r1kh_wildcard)
os_memcpy(r1kh->addr, src_addr, ETH_ALEN);
}
seq_ret = wpa_ft_rrb_seq_chk(rkh_seq, src_addr, enc, enc_len, auth,
auth_len, "seq response", 1);
if (seq_ret == FT_RRB_SEQ_OK) {
wpa_printf(MSG_DEBUG, "FT: seq response - valid seq number");
wpa_ft_rrb_seq_accept(wpa_auth, rkh_seq, src_addr, auth,
auth_len, "seq response");
} else {
wpa_printf(MSG_DEBUG, "FT: seq response - reset seq number");
RRB_GET_AUTH(FT_RRB_SEQ, seq, "seq response",
sizeof(*msg_both));
msg_both = (const struct ft_rrb_seq *) f_seq;
msg_dom = le_to_host32(msg_both->dom);
msg_seq = le_to_host32(msg_both->seq);
now_remote.sec = le_to_host32(msg_both->ts);
now_remote.usec = 0;
rkh_seq->rx.num_last = 2;
rkh_seq->rx.dom = msg_dom;
rkh_seq->rx.offsetidx = 0;
/* Accept some older, possibly cached packets as well */
rkh_seq->rx.last[0] = msg_seq - FT_REMOTE_SEQ_BACKLOG -
dl_list_len(&rkh_seq->rx.queue);
rkh_seq->rx.last[1] = msg_seq;
/* local time - offset = remote time
* <=> local time - remote time = offset */
os_reltime_sub(&now, &now_remote, &rkh_seq->rx.time_offset);
}
wpa_ft_rrb_seq_flush(wpa_auth, rkh_seq, 1);
return 0;
out:
return -1;
}
int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
const u8 *data, size_t data_len)
{
struct ft_rrb_frame *frame;
u16 alen;
const u8 *pos, *end, *start;
u8 action;
const u8 *sta_addr, *target_ap_addr;
wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
MAC2STR(src_addr));
if (data_len < sizeof(*frame)) {
wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
(unsigned long) data_len);
return -1;
}
pos = data;
frame = (struct ft_rrb_frame *) pos;
pos += sizeof(*frame);
alen = le_to_host16(frame->action_length);
wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
"action_length=%d ap_address=" MACSTR,
frame->frame_type, frame->packet_type, alen,
MAC2STR(frame->ap_address));
if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
/* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
"unrecognized type %d", frame->frame_type);
return -1;
}
if (alen > data_len - sizeof(*frame)) {
wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
"frame");
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
if (alen < 1 + 1 + 2 * ETH_ALEN) {
wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
"room for Action Frame body); alen=%lu",
(unsigned long) alen);
return -1;
}
start = pos;
end = pos + alen;
if (*pos != WLAN_ACTION_FT) {
wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
"%d", *pos);
return -1;
}
pos++;
action = *pos++;
sta_addr = pos;
pos += ETH_ALEN;
target_ap_addr = pos;
pos += ETH_ALEN;
wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
MACSTR " target_ap_addr=" MACSTR,
action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
if (frame->packet_type == FT_PACKET_REQUEST) {
wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
if (action != 1) {
wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
"RRB Request", action);
return -1;
}
if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
"RRB Request does not match with own "
"address");
return -1;
}
if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
sta_addr, pos, end - pos) < 0)
return -1;
} else if (frame->packet_type == FT_PACKET_RESPONSE) {
u16 status_code;
if (end - pos < 2) {
wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
"code in RRB Response");
return -1;
}
status_code = WPA_GET_LE16(pos);
pos += 2;
wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
"(status_code=%d)", status_code);
if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
return -1;
} else {
wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
"packet_type %d", frame->packet_type);
return -1;
}
if (end > pos) {
wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
pos, end - pos);
}
return 0;
}
void wpa_ft_rrb_oui_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
const u8 *dst_addr, u8 oui_suffix, const u8 *data,
size_t data_len)
{
const u8 *auth, *enc;
size_t alen, elen;
int no_defer = 0;
wpa_printf(MSG_DEBUG, "FT: RRB-OUI received frame from remote AP "
MACSTR, MAC2STR(src_addr));
wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame - oui_suffix=%d", oui_suffix);
wpa_hexdump(MSG_MSGDUMP, "FT: RRB frame payload", data, data_len);
if (is_multicast_ether_addr(src_addr)) {
wpa_printf(MSG_DEBUG,
"FT: RRB-OUI received frame from multicast address "
MACSTR, MAC2STR(src_addr));
return;
}
if (is_multicast_ether_addr(dst_addr)) {
wpa_printf(MSG_DEBUG,
"FT: RRB-OUI received frame from remote AP " MACSTR
" to multicast address " MACSTR,
MAC2STR(src_addr), MAC2STR(dst_addr));
no_defer = 1;
}
if (data_len < sizeof(u16)) {
wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
return;
}
alen = WPA_GET_LE16(data);
if (data_len < sizeof(u16) + alen) {
wpa_printf(MSG_DEBUG, "FT: RRB-OUI frame too short");
return;
}
auth = data + sizeof(u16);
wpa_hexdump(MSG_MSGDUMP, "FT: Authenticated payload", auth, alen);
enc = data + sizeof(u16) + alen;
elen = data_len - sizeof(u16) - alen;
wpa_hexdump(MSG_MSGDUMP, "FT: Encrypted payload", enc, elen);
switch (oui_suffix) {
case FT_PACKET_R0KH_R1KH_PULL:
wpa_ft_rrb_rx_pull(wpa_auth, src_addr, enc, elen, auth, alen,
no_defer);
break;
case FT_PACKET_R0KH_R1KH_RESP:
wpa_ft_rrb_rx_resp(wpa_auth, src_addr, enc, elen, auth, alen,
no_defer);
break;
case FT_PACKET_R0KH_R1KH_PUSH:
wpa_ft_rrb_rx_push(wpa_auth, src_addr, enc, elen, auth, alen,
no_defer);
break;
case FT_PACKET_R0KH_R1KH_SEQ_REQ:
wpa_ft_rrb_rx_seq_req(wpa_auth, src_addr, enc, elen, auth, alen,
no_defer);
break;
case FT_PACKET_R0KH_R1KH_SEQ_RESP:
wpa_ft_rrb_rx_seq_resp(wpa_auth, src_addr, enc, elen, auth,
alen, no_defer);
break;
}
}
static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
struct wpa_ft_pmk_r0_sa *pmk_r0,
struct ft_remote_r1kh *r1kh,
const u8 *s1kh_id)
{
u8 *packet;
size_t packet_len;
struct ft_rrb_seq f_seq;
struct tlv_list push[] = {
{ .type = FT_RRB_S1KH_ID, .len = ETH_ALEN,
.data = s1kh_id },
{ .type = FT_RRB_PMK_R0_NAME, .len = WPA_PMK_NAME_LEN,
.data = pmk_r0->pmk_r0_name },
{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
};
struct tlv_list push_auth[] = {
{ .type = FT_RRB_SEQ, .len = sizeof(f_seq),
.data = (u8 *) &f_seq },
{ .type = FT_RRB_R0KH_ID,
.len = wpa_auth->conf.r0_key_holder_len,
.data = wpa_auth->conf.r0_key_holder },
{ .type = FT_RRB_R1KH_ID, .len = FT_R1KH_ID_LEN,
.data = r1kh->id },
{ .type = FT_RRB_LAST_EMPTY, .len = 0, .data = NULL },
};
if (wpa_ft_new_seq(r1kh->seq, &f_seq) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to get seq num");
return -1;
}
if (wpa_ft_rrb_build_r0(r1kh->key, sizeof(r1kh->key), push, pmk_r0,
r1kh->id, s1kh_id, push_auth, wpa_auth->addr,
FT_PACKET_R0KH_R1KH_PUSH,
&packet, &packet_len) < 0)
return -1;
wpa_ft_rrb_oui_send(wpa_auth, r1kh->addr, FT_PACKET_R0KH_R1KH_PUSH,
packet, packet_len);
os_free(packet);
return 0;
}
void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r0_sa *r0, *r0found = NULL;
struct ft_remote_r1kh *r1kh;
if (!wpa_auth->conf.pmk_r1_push)
return;
if (!wpa_auth->conf.r1kh_list)
return;
dl_list_for_each(r0, &cache->pmk_r0, struct wpa_ft_pmk_r0_sa, list) {
if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) {
r0found = r0;
break;
}
}
r0 = r0found;
if (r0 == NULL || r0->pmk_r1_pushed)
return;
r0->pmk_r1_pushed = 1;
wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
"for STA " MACSTR, MAC2STR(addr));
for (r1kh = *wpa_auth->conf.r1kh_list; r1kh; r1kh = r1kh->next) {
if (is_zero_ether_addr(r1kh->addr) ||
is_zero_ether_addr(r1kh->id))
continue;
if (wpa_ft_rrb_init_r1kh_seq(r1kh) < 0)
continue;
wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
}
}
#endif /* CONFIG_IEEE80211R_AP */