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ap: Parse WSC PBC association request and build response

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Check the conditions for PBC enrollee registration when we receive the
Association Request with WSC IE and indicate to the enrollee whether we
accept the association using a WSC IE in the Association Response.
After this, a NULL sta->assoc_rsne indicates that the station is not
establishing the RSNA and is a WSC enrollee.
This commit is contained in:
Andrew Zaborowski 2020-08-28 14:46:48 +02:00 committed by Denis Kenzior
parent 99112c9317
commit 7a7c580ffc
1 changed files with 151 additions and 35 deletions
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186
src/ap.c
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@ -91,6 +91,8 @@ struct sta_state {
struct eapol_sm *sm;
struct handshake_state *hs;
uint32_t gtk_query_cmd_id;
uint8_t wsc_uuid_e[16];
bool wsc_v2;
};
struct ap_wsc_pbc_probe_record {
@ -906,7 +908,7 @@ static void ap_fail_assoc_resp_cb(struct l_genl_msg *msg, void *user_data)
}
static uint32_t ap_assoc_resp(struct ap_state *ap, struct sta_state *sta,
const uint8_t *dest, uint16_t aid,
const uint8_t *dest,
enum mmpdu_reason_code status_code,
bool reassoc, l_genl_msg_func_t callback)
{
@ -934,7 +936,7 @@ static uint32_t ap_assoc_resp(struct ap_state *ap, struct sta_state *sta,
resp = (void *) mmpdu_body(mpdu);
l_put_le16(capability, &resp->capability);
resp->status_code = L_CPU_TO_LE16(status_code);
resp->aid = L_CPU_TO_LE16(aid | 0xc000);
resp->aid = sta ? L_CPU_TO_LE16(sta->aid | 0xc000) : 0;
/* Supported Rates IE */
resp->ies[ies_len++] = IE_TYPE_SUPPORTED_RATES;
@ -956,6 +958,38 @@ static uint32_t ap_assoc_resp(struct ap_state *ap, struct sta_state *sta,
resp->ies[ies_len++] = count;
ies_len += count;
if (sta && !sta->assoc_rsne) {
struct wsc_association_response wsc_resp = {};
uint8_t *wsc_data;
size_t wsc_data_len;
uint8_t *wsc_ie;
size_t wsc_ie_len;
wsc_resp.response_type = WSC_RESPONSE_TYPE_AP;
wsc_resp.version2 = sta->wsc_v2;
wsc_data = wsc_build_association_response(&wsc_resp,
&wsc_data_len);
if (!wsc_data) {
l_error("wsc_build_beacon error");
goto send_frame;
}
wsc_ie = ie_tlv_encapsulate_wsc_payload(wsc_data, wsc_data_len,
&wsc_ie_len);
l_free(wsc_data);
if (!wsc_ie) {
l_error("ie_tlv_encapsulate_wsc_payload error");
goto send_frame;
}
memcpy(resp->ies + ies_len, wsc_ie, wsc_ie_len);
ies_len += wsc_ie_len;
l_free(wsc_ie);
}
send_frame:
return ap_send_mgmt_frame(ap, mpdu, resp->ies + ies_len - mpdu_buf,
true, callback, sta);
}
@ -1030,8 +1064,8 @@ static int ap_parse_supported_rates(struct ie_tlv_iter *iter,
*/
static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc,
const struct mmpdu_field_capability *capability,
uint16_t listen_interval,
struct ie_tlv_iter *ies)
uint16_t listen_interval, const uint8_t *ies,
size_t ies_len)
{
struct ap_state *ap = sta->ap;
const char *ssid = NULL;
@ -1040,6 +1074,9 @@ static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc,
struct l_uintset *rates = NULL;
struct ie_rsn_info rsn_info;
int err;
struct ie_tlv_iter iter;
uint8_t *wsc_data = NULL;
ssize_t wsc_data_len;
if (sta->assoc_resp_cmd_id)
return;
@ -1049,16 +1086,20 @@ static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc,
goto unsupported;
}
while (ie_tlv_iter_next(ies))
switch (ie_tlv_iter_get_tag(ies)) {
wsc_data = ie_tlv_extract_wsc_payload(ies, ies_len, &wsc_data_len);
ie_tlv_iter_init(&iter, ies, ies_len);
while (ie_tlv_iter_next(&iter))
switch (ie_tlv_iter_get_tag(&iter)) {
case IE_TYPE_SSID:
ssid = (const char *) ie_tlv_iter_get_data(ies);
ssid_len = ie_tlv_iter_get_length(ies);
ssid = (const char *) ie_tlv_iter_get_data(&iter);
ssid_len = ie_tlv_iter_get_length(&iter);
break;
case IE_TYPE_SUPPORTED_RATES:
case IE_TYPE_EXTENDED_SUPPORTED_RATES:
if (ap_parse_supported_rates(ies, &rates) < 0) {
if (ap_parse_supported_rates(&iter, &rates) < 0) {
err = MMPDU_REASON_CODE_INVALID_IE;
goto bad_frame;
}
@ -1066,16 +1107,26 @@ static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc,
break;
case IE_TYPE_RSN:
if (ie_parse_rsne(ies, &rsn_info) < 0) {
/*
* WSC v2.0.5 Section 8.2:
* "Note that during the WSC association [...] the
* RSN IE and the WPA IE are irrelevant and shall be
* ignored by both the station and AP."
*/
if (wsc_data)
break;
if (ie_parse_rsne(&iter, &rsn_info) < 0) {
err = MMPDU_REASON_CODE_INVALID_IE;
goto bad_frame;
}
rsn = (const uint8_t *) ie_tlv_iter_get_data(ies) - 2;
rsn = (const uint8_t *) ie_tlv_iter_get_data(&iter) - 2;
break;
}
if (!rates || !ssid || !rsn || ssid_len != strlen(ap->config->ssid) ||
if (!rates || !ssid || (!wsc_data && !rsn) ||
ssid_len != strlen(ap->config->ssid) ||
memcmp(ssid, ap->config->ssid, ssid_len)) {
err = MMPDU_REASON_CODE_INVALID_IE;
goto bad_frame;
@ -1086,19 +1137,82 @@ static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc,
goto unsupported;
}
if (rsn_info.mfpr && rsn_info.spp_a_msdu_required) {
err = MMPDU_REASON_CODE_UNSPECIFIED;
goto unsupported;
}
/* Is the client requesting RSNA establishment or WSC registration */
if (!rsn) {
struct wsc_association_request wsc_req;
struct ap_event_registration_start_data event_data;
struct ap_wsc_pbc_probe_record *record;
if (!(rsn_info.pairwise_ciphers & ap->ciphers)) {
err = MMPDU_REASON_CODE_INVALID_PAIRWISE_CIPHER;
goto unsupported;
}
if (wsc_parse_association_request(wsc_data, wsc_data_len,
&wsc_req) < 0) {
err = MMPDU_REASON_CODE_INVALID_IE;
goto bad_frame;
}
if (rsn_info.akm_suites != IE_RSN_AKM_SUITE_PSK) {
err = MMPDU_REASON_CODE_INVALID_AKMP;
goto unsupported;
l_free(wsc_data);
wsc_data = NULL;
if (wsc_req.request_type !=
WSC_REQUEST_TYPE_ENROLLEE_OPEN_8021X) {
err = MMPDU_REASON_CODE_INVALID_IE;
goto bad_frame;
}
if (!ap->wsc_pbc_timeout) {
l_debug("WSC association from %s but we're not in "
"PBC mode", util_address_to_string(sta->addr));
err = MMPDU_REASON_CODE_UNSPECIFIED;
goto bad_frame;
}
if (l_queue_isempty(ap->wsc_pbc_probes)) {
l_debug("%s tried to register as enrollee but we "
"don't have their Probe Request record",
util_address_to_string(sta->addr));
err = MMPDU_REASON_CODE_UNSPECIFIED;
goto bad_frame;
}
/*
* For PBC, the Enrollee must have sent the only PBC Probe
* Request within the monitor time and walk time.
*/
record = l_queue_peek_head(ap->wsc_pbc_probes);
if (memcmp(sta->addr, record->mac, 6)) {
l_debug("Session overlap during %s's attempt to "
"register as WSC enrollee",
util_address_to_string(sta->addr));
err = MMPDU_REASON_CODE_UNSPECIFIED;
goto bad_frame;
}
memcpy(sta->wsc_uuid_e, record->uuid_e, 16);
sta->wsc_v2 = wsc_req.version2;
event_data.mac = sta->addr;
ap->event_func(AP_EVENT_REGISTRATION_START, &event_data,
ap->user_data);
/*
* Since we're starting the PBC Registration Protocol
* we can now exit the "active PBC mode".
*/
ap_wsc_exit_pbc(ap);
} else {
if (rsn_info.mfpr && rsn_info.spp_a_msdu_required) {
err = MMPDU_REASON_CODE_UNSPECIFIED;
goto unsupported;
}
if (!(rsn_info.pairwise_ciphers & ap->ciphers)) {
err = MMPDU_REASON_CODE_INVALID_PAIRWISE_CIPHER;
goto unsupported;
}
if (rsn_info.akm_suites != IE_RSN_AKM_SUITE_PSK) {
err = MMPDU_REASON_CODE_INVALID_AKMP;
goto unsupported;
}
}
/* 802.11-2016 11.3.5.3 j) */
@ -1128,10 +1242,12 @@ static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc,
if (sta->assoc_rsne)
l_free(sta->assoc_rsne);
sta->assoc_rsne = l_memdup(rsn, rsn[1] + 2);
if (rsn)
sta->assoc_rsne = l_memdup(rsn, rsn[1] + 2);
else
sta->assoc_rsne = NULL;
sta->assoc_resp_cmd_id = ap_assoc_resp(ap, sta, sta->addr, sta->aid, 0,
reassoc,
sta->assoc_resp_cmd_id = ap_assoc_resp(ap, sta, sta->addr, 0, reassoc,
ap_success_assoc_resp_cb);
if (!sta->assoc_resp_cmd_id)
l_error("Sending success (Re)Association Response failed");
@ -1160,7 +1276,9 @@ bad_frame:
if (rates)
l_uintset_free(rates);
if (!ap_assoc_resp(ap, NULL, sta->addr, 0, err, reassoc,
l_free(wsc_data);
if (!ap_assoc_resp(ap, sta, sta->addr, err, reassoc,
ap_fail_assoc_resp_cb))
l_error("Sending error (Re)Association Response failed");
}
@ -1174,7 +1292,6 @@ static void ap_assoc_req_cb(const struct mmpdu_header *hdr, const void *body,
const uint8_t *from = hdr->address_2;
const struct mmpdu_association_request *req = body;
const uint8_t *bssid = netdev_get_address(ap->netdev);
struct ie_tlv_iter iter;
l_info("AP Association Request from %s", util_address_to_string(from));
@ -1184,7 +1301,7 @@ static void ap_assoc_req_cb(const struct mmpdu_header *hdr, const void *body,
sta = l_queue_find(ap->sta_states, ap_sta_match_addr, from);
if (!sta) {
if (!ap_assoc_resp(ap, NULL, from, 0,
if (!ap_assoc_resp(ap, NULL, from,
MMPDU_REASON_CODE_STA_REQ_ASSOC_WITHOUT_AUTH,
false, ap_fail_assoc_resp_cb))
l_error("Sending error Association Response failed");
@ -1192,9 +1309,9 @@ static void ap_assoc_req_cb(const struct mmpdu_header *hdr, const void *body,
return;
}
ie_tlv_iter_init(&iter, req->ies, body_len - sizeof(*req));
ap_assoc_reassoc(sta, false, &req->capability,
L_LE16_TO_CPU(req->listen_interval), &iter);
L_LE16_TO_CPU(req->listen_interval),
req->ies, body_len - sizeof(*req));
}
/* 802.11-2016 9.3.3.8 */
@ -1206,7 +1323,6 @@ static void ap_reassoc_req_cb(const struct mmpdu_header *hdr, const void *body,
const uint8_t *from = hdr->address_2;
const struct mmpdu_reassociation_request *req = body;
const uint8_t *bssid = netdev_get_address(ap->netdev);
struct ie_tlv_iter iter;
int err;
l_info("AP Reassociation Request from %s",
@ -1227,13 +1343,13 @@ static void ap_reassoc_req_cb(const struct mmpdu_header *hdr, const void *body,
goto bad_frame;
}
ie_tlv_iter_init(&iter, req->ies, body_len - sizeof(*req));
ap_assoc_reassoc(sta, true, &req->capability,
L_LE16_TO_CPU(req->listen_interval), &iter);
L_LE16_TO_CPU(req->listen_interval),
req->ies, body_len - sizeof(*req));
return;
bad_frame:
if (!ap_assoc_resp(ap, NULL, from, 0, err, true, ap_fail_assoc_resp_cb))
if (!ap_assoc_resp(ap, NULL, from, err, true, ap_fail_assoc_resp_cb))
l_error("Sending error Reassociation Response failed");
}