blob: 32b745651ace85d86f0ebda77824cd1abfd472f0 [file] [log] [blame]
/*
* 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 "common/wpa_ctrl.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"
#include "pmksa_cache_auth.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, int rsnxe_used)
{
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, !!rsnxe_used);
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, !!rsnxe_used);
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 sequence number request from " MACSTR
" to " MACSTR,
MAC2STR(wpa_auth->addr), 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;
}
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: Temporarily block 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 temporarily blocked",
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);
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);
}
wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request from " MACSTR
" to remote R0KH address " MACSTR,
MAC2STR(sm->wpa_auth->addr), MAC2STR(r0kh->addr));
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, 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;
const u8 *mpmk;
size_t mpmk_len;
if (sm->xxkey_len > 0) {
mpmk = sm->xxkey;
mpmk_len = sm->xxkey_len;
} else if (sm->pmksa) {
mpmk = sm->pmksa->pmk;
mpmk_len = sm->pmksa->pmk_len;
} else {
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(mpmk, mpmk_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;
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;
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,
0);
}
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_auth_config *conf = &sm->wpa_auth->conf;
struct wpa_group *gsm = sm->group;
size_t subelem_len, pad_len;
const u8 *key;
size_t key_len;
u8 keybuf[WPA_GTK_MAX_LEN];
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);
if (conf->disable_gtk ||
sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
/*
* Provide unique random GTK to each STA to prevent use
* of GTK in the BSS.
*/
if (random_get_bytes(keybuf, key_len) < 0)
return NULL;
}
os_memset(keybuf + key_len, 0, pad_len);
keybuf[key_len] = 0xdd;
key_len += pad_len;
key = keybuf;
} else if (conf->disable_gtk || sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
/*
* Provide unique random GTK to each STA to prevent use of GTK
* in the BSS.
*/
if (random_get_bytes(keybuf, key_len) < 0)
return NULL;
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;
}
forced_memzero(keybuf, sizeof(keybuf));
*len = subelem_len;
return subelem;
}
static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
u8 *subelem, *pos;
struct wpa_auth_config *conf = &sm->wpa_auth->conf;
struct wpa_group *gsm = sm->group;
size_t subelem_len;
const u8 *kek, *igtk;
size_t kek_len;
size_t igtk_len;
u8 dummy_igtk[WPA_IGTK_MAX_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;
igtk = gsm->IGTK[gsm->GN_igtk - 4];
if (conf->disable_gtk || sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
/*
* Provide unique random IGTK to each STA to prevent use of
* IGTK in the BSS.
*/
if (random_get_bytes(dummy_igtk, igtk_len / 8) < 0) {
os_free(subelem);
return NULL;
}
igtk = dummy_igtk;
}
if (aes_wrap(kek, kek_len, igtk_len / 8, igtk, 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;
}
static u8 * wpa_ft_bigtk_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, *bigtk;
size_t kek_len;
size_t bigtk_len;
u8 dummy_bigtk[WPA_IGTK_MAX_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;
}
bigtk_len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
/* Sub-elem ID[1] | Length[1] | KeyID[2] | BIPN[6] | Key Length[1] |
* Key[16+8] */
subelem_len = 1 + 1 + 2 + 6 + 1 + bigtk_len + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return NULL;
pos = subelem;
*pos++ = FTIE_SUBELEM_BIGTK;
*pos++ = subelem_len - 2;
WPA_PUT_LE16(pos, gsm->GN_bigtk);
pos += 2;
wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_bigtk, pos);
pos += 6;
*pos++ = bigtk_len;
bigtk = gsm->IGTK[gsm->GN_bigtk - 6];
if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
/*
* Provide unique random BIGTK to each OSEN STA to prevent use
* of BIGTK in the BSS.
*/
if (random_get_bytes(dummy_bigtk, bigtk_len / 8) < 0) {
os_free(subelem);
return NULL;
}
bigtk = dummy_bigtk;
}
if (aes_wrap(kek, kek_len, bigtk_len / 8, bigtk, pos)) {
wpa_printf(MSG_DEBUG,
"FT: BIGTK subelem encryption failed: kek_len=%d",
(int) kek_len);
os_free(subelem);
return NULL;
}
*len = subelem_len;
return subelem;
}
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,
int omit_rsnxe)
{
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;
u8 rsnxe_buf[10], *rsnxe = rsnxe_buf;
size_t rsnxe_len;
int rsnxe_used;
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;
#ifdef CONFIG_TESTING_OPTIONS
if (auth_alg == WLAN_AUTH_FT &&
sm->wpa_auth->conf.rsne_override_ft_set) {
wpa_printf(MSG_DEBUG,
"TESTING: RSNE FT override for MIC calculation");
rsnie = sm->wpa_auth->conf.rsne_override_ft;
rsnie_len = sm->wpa_auth->conf.rsne_override_ft_len;
if (end - pos < (long int) rsnie_len)
return pos;
os_memcpy(pos, rsnie, rsnie_len);
rsnie = pos;
pos += rsnie_len;
if (rsnie_len > PMKID_LEN && sm->pmk_r1_name_valid) {
int idx;
/* Replace all 0xff PMKID with the valid PMKR1Name */
for (idx = 0; idx < PMKID_LEN; idx++) {
if (rsnie[rsnie_len - 1 - idx] != 0xff)
break;
}
if (idx == PMKID_LEN)
os_memcpy(&rsnie[rsnie_len - PMKID_LEN],
sm->pmk_r1_name, WPA_PMK_NAME_LEN);
}
} else
#endif /* CONFIG_TESTING_OPTIONS */
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;
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;