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FT: Add session_timeout to push/resp

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This ensures a session timeout configured on R0KH either using
RADIUS-based ACL or 802.1X authentication is copied over to the new
R1KH.

Signed-off-by: Michael Braun <michael-dev@fami-braun.de>
This commit is contained in:
Michael Braun 2017-05-18 15:21:56 +02:00 committed by Jouni Malinen
parent 3cb286ca49
commit a6509e850e
2 changed files with 135 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/ap/wpa_auth.h
View File

@ -86,6 +86,7 @@ struct ft_rrb_frame {
#define FT_RRB_IDENTITY 15
#define FT_RRB_RADIUS_CUI 16
#define FT_RRB_SESSION_TIMEOUT 17 /* le32 seconds */
struct ft_rrb_tlv {
le16 type;
@ -101,7 +102,8 @@ struct ft_rrb_seq {
/* session TLVs:
* required: PMK_R1, PMK_R1_NAME, PAIRWISE
* optional: VLAN_UNTAGGED, VLAN_TAGGED, EXPIRES_IN, IDENTITY, RADIUS_CUI
* optional: VLAN_UNTAGGED, VLAN_TAGGED, EXPIRES_IN, IDENTITY, RADIUS_CUI,
* SESSION_TIMEOUT
*
* pull frame TLVs:
* auth:

163
src/ap/wpa_auth_ft.c
View File

@ -691,6 +691,27 @@ wpa_ft_get_radius_cui(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
}
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)
@ -1080,7 +1101,8 @@ struct wpa_ft_pmk_r0_sa {
size_t identity_len;
u8 *radius_cui;
size_t radius_cui_len;
/* TODO: radius_class, EAP type, expiration from EAPOL */
os_time_t session_timeout; /* 0 for no expiration */
/* TODO: radius_class, EAP type */
int pmk_r1_pushed;
};
@ -1095,7 +1117,8 @@ struct wpa_ft_pmk_r1_sa {
size_t identity_len;
u8 *radius_cui;
size_t radius_cui_len;
/* TODO: expiration from EAPOL, radius_class, EAP type */
os_time_t session_timeout; /* 0 for no expiration */
/* TODO: radius_class, EAP type */
};
struct wpa_ft_pmk_cache {
@ -1129,6 +1152,7 @@ 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);
@ -1136,13 +1160,24 @@ static void wpa_ft_expire_pmk_r0(void *eloop_ctx, void *timeout_ctx)
return;
expires_in = r0->expiration - now.sec;
if (expires_in > 0) {
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, delete in %ds",
__func__, r0, expires_in);
"FT: %s() called for non-expired entry %p",
__func__, r0);
eloop_cancel_timeout(wpa_ft_expire_pmk_r0, r0, NULL);
eloop_register_timeout(expires_in + 1, 0,
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;
}
@ -1209,7 +1244,7 @@ static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r0,
const u8 *pmk_r0_name, int pairwise,
const struct vlan_description *vlan,
int expires_in,
int expires_in, int session_timeout,
const u8 *identity, size_t identity_len,
const u8 *radius_cui, size_t radius_cui_len)
{
@ -1252,11 +1287,16 @@ static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
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;
}
@ -1289,15 +1329,17 @@ static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r1,
const u8 *pmk_r1_name, int pairwise,
const struct vlan_description *vlan,
int expires_in,
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;
@ -1332,12 +1374,17 @@ static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
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;
}
@ -1348,10 +1395,14 @@ static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
u8 *pmk_r1, int *pairwise,
struct vlan_description *vlan,
const u8 **identity, size_t *identity_len,
const u8 **radius_cui, size_t *radius_cui_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 &&
@ -1372,6 +1423,13 @@ static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
*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
*session_timeout = 0;
return 0;
}
}
@ -1913,6 +1971,7 @@ int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
struct vlan_description vlan;
const u8 *identity, *radius_cui;
size_t identity_len, radius_cui_len;
int session_timeout;
if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
@ -1923,10 +1982,12 @@ int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
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_name,
sm->pairwise, &vlan, expires_in, identity,
identity_len, radius_cui, radius_cui_len);
sm->pairwise, &vlan, expires_in,
session_timeout, identity, identity_len,
radius_cui, radius_cui_len);
}
@ -1947,6 +2008,7 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
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 "
@ -1963,6 +2025,7 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
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,
@ -1972,8 +2035,9 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
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_name,
sm->pairwise, &vlan, expires_in, identity,
identity_len, radius_cui, radius_cui_len);
sm->pairwise, &vlan, expires_in,
session_timeout, identity, identity_len,
radius_cui, radius_cui_len);
if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
pmk_r1, sm->pmk_r1_name) < 0)
@ -1984,8 +2048,8 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1,
sm->pmk_r1_name, sm->pairwise, &vlan,
expires_in, identity, identity_len,
radius_cui, radius_cui_len);
expires_in, session_timeout, identity,
identity_len, radius_cui, radius_cui_len);
return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
sm->wpa_auth->addr, sm->pmk_r1_name,
@ -2411,7 +2475,8 @@ static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
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)
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];
@ -2465,6 +2530,11 @@ static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
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;
}
@ -2523,12 +2593,15 @@ static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
struct vlan_description *vlan,
const u8 **identity, size_t *identity_len,
const u8 **radius_cui,
size_t *radius_cui_len)
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) !=
@ -2548,15 +2621,15 @@ static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", out_pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
if (r0->expiration) {
struct os_reltime now;
os_get_reltime(&now);
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, pmk_r1_name,
sm->pairwise, r0->vlan, expires_in,
sm->pairwise, r0->vlan, expires_in, session_timeout,
r0->identity, r0->identity_len,
r0->radius_cui, r0->radius_cui_len);
@ -2578,6 +2651,8 @@ static int wpa_ft_local_derive_pmk_r1(struct wpa_authenticator *wpa_auth,
*radius_cui_len = r0->radius_cui_len;
}
*out_session_timeout = session_timeout;
return 0;
}
@ -2595,7 +2670,7 @@ static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
size_t buflen;
int ret;
u8 *pos, *end;
int pairwise;
int pairwise, session_timeout = 0;
struct vlan_description vlan;
const u8 *identity, *radius_cui;
size_t identity_len = 0, radius_cui_len = 0;
@ -2662,14 +2737,15 @@ static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
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) < 0)
&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, &pairwise, &vlan, &identity,
&identity_len, &radius_cui,
&radius_cui_len) < 0) {
&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,
@ -2677,8 +2753,8 @@ static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
parse.rsn_pmkid,
pmk_r1_name, pmk_r1, &pairwise,
&vlan, &identity, &identity_len,
&radius_cui, &radius_cui_len) ==
0) {
&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;
@ -2733,6 +2809,7 @@ pmk_r1_derived:
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;
@ -3161,7 +3238,9 @@ static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_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[] = {
@ -3177,6 +3256,9 @@ static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_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 },
};
@ -3196,6 +3278,14 @@ static int wpa_ft_rrb_build_r0(const u8 *key, const size_t key_len,
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);
@ -3381,12 +3471,15 @@ static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
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;
RRB_GET_AUTH(FT_RRB_R0KH_ID, r0kh_id, msgtype, -1);
@ -3500,9 +3593,17 @@ static int wpa_ft_rrb_rx_r1(struct wpa_authenticator *wpa_auth,
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, f_pmk_r1_name,
pairwise, &vlan, expires_in, f_identity,
f_identity_len, f_radius_cui,
pairwise, &vlan, expires_in, session_timeout,
f_identity, f_identity_len, f_radius_cui,
f_radius_cui_len) < 0)
goto out;