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DPP2: GAS comeback request processing for Configurator over TCP

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Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-06-18 13:38:37 +03:00 committed by Jouni Malinen
parent 68d9586a46
commit 18e013a93f
1 changed files with 127 additions and 46 deletions
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173
src/common/dpp_tcp.c
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@ -38,7 +38,9 @@ struct dpp_connection {
unsigned int on_tcp_tx_complete_gas_done:1;
unsigned int on_tcp_tx_complete_remove:1;
unsigned int on_tcp_tx_complete_auth_ok:1;
unsigned int gas_comeback_in_progress:1;
u8 gas_dialog_token;
struct wpabuf *gas_resp;
};
/* Remote Controller */
@ -88,6 +90,7 @@ static void dpp_connection_free(struct dpp_connection *conn)
eloop_cancel_timeout(dpp_tcp_gas_query_comeback, conn, NULL);
wpabuf_free(conn->msg);
wpabuf_free(conn->msg_out);
wpabuf_free(conn->gas_resp);
dpp_auth_deinit(conn->auth);
os_free(conn);
}
@ -976,14 +979,91 @@ static int dpp_controller_rx_action(struct dpp_connection *conn, const u8 *msg,
}
static int dpp_tcp_send_comeback_delay(struct dpp_connection *conn, u8 action)
{
struct wpabuf *buf;
size_t len = 18;
if (action == WLAN_PA_GAS_COMEBACK_RESP)
len++;
buf = wpabuf_alloc(4 + len);
if (!buf)
return -1;
wpabuf_put_be32(buf, len);
wpabuf_put_u8(buf, action);
wpabuf_put_u8(buf, conn->gas_dialog_token);
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
if (action == WLAN_PA_GAS_COMEBACK_RESP)
wpabuf_put_u8(buf, 0);
wpabuf_put_le16(buf, 500); /* GAS Comeback Delay */
dpp_write_adv_proto(buf);
wpabuf_put_le16(buf, 0); /* Query Response Length */
/* Send Config Response over TCP */
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", buf);
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = buf;
dpp_tcp_send(conn);
return 0;
}
static int dpp_tcp_send_gas_resp(struct dpp_connection *conn, u8 action,
struct wpabuf *resp)
{
struct wpabuf *buf;
size_t len;
if (!resp)
return -1;
len = 18 + wpabuf_len(resp);
if (action == WLAN_PA_GAS_COMEBACK_RESP)
len++;
buf = wpabuf_alloc(4 + len);
if (!buf) {
wpabuf_free(resp);
return -1;
}
wpabuf_put_be32(buf, len);
wpabuf_put_u8(buf, action);
wpabuf_put_u8(buf, conn->gas_dialog_token);
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
if (action == WLAN_PA_GAS_COMEBACK_RESP)
wpabuf_put_u8(buf, 0);
wpabuf_put_le16(buf, 0); /* GAS Comeback Delay */
dpp_write_adv_proto(buf);
dpp_write_gas_query(buf, resp);
wpabuf_free(resp);
/* Send Config Response over TCP; GAS fragmentation is taken care of by
* the Relay */
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", buf);
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = buf;
conn->on_tcp_tx_complete_gas_done = 1;
dpp_tcp_send(conn);
return 0;
}
static int dpp_controller_rx_gas_req(struct dpp_connection *conn, const u8 *msg,
size_t len)
{
const u8 *pos, *end, *next;
u8 dialog_token;
const u8 *adv_proto;
u16 slen;
struct wpabuf *resp, *buf;
struct wpabuf *resp;
struct dpp_authentication *auth = conn->auth;
if (len < 1 + 2)
@ -1001,7 +1081,7 @@ static int dpp_controller_rx_gas_req(struct dpp_connection *conn, const u8 *msg,
pos = msg;
end = msg + len;
dialog_token = *pos++;
conn->gas_dialog_token = *pos++;
adv_proto = pos++;
slen = *pos++;
if (*adv_proto != WLAN_EID_ADV_PROTO ||
@ -1028,57 +1108,53 @@ static int dpp_controller_rx_gas_req(struct dpp_connection *conn, const u8 *msg,
resp = dpp_conf_req_rx(auth, pos, slen);
if (!resp && auth->waiting_cert) {
wpa_printf(MSG_DEBUG, "DPP: Certificate not yet ready");
buf = wpabuf_alloc(4 + 18);
if (!buf)
return -1;
wpabuf_put_be32(buf, 18);
wpabuf_put_u8(buf, WLAN_PA_GAS_INITIAL_RESP);
wpabuf_put_u8(buf, dialog_token);
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
wpabuf_put_le16(buf, 500); /* GAS Comeback Delay */
dpp_write_adv_proto(buf);
wpabuf_put_le16(buf, 0); /* Query Response Length */
/* Send Config Response over TCP */
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", buf);
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = buf;
dpp_tcp_send(conn);
return 0;
conn->gas_comeback_in_progress = 1;
return dpp_tcp_send_comeback_delay(conn,
WLAN_PA_GAS_INITIAL_RESP);
}
if (!resp)
return dpp_tcp_send_gas_resp(conn, WLAN_PA_GAS_INITIAL_RESP, resp);
}
static int dpp_controller_rx_gas_comeback_req(struct dpp_connection *conn,
const u8 *msg, size_t len)
{
u8 dialog_token;
struct dpp_authentication *auth = conn->auth;
struct wpabuf *resp;
if (len < 1)
return -1;
buf = wpabuf_alloc(4 + 18 + wpabuf_len(resp));
if (!buf) {
wpabuf_free(resp);
wpa_printf(MSG_DEBUG,
"DPP: Received DPP Configuration Request over TCP (comeback)");
if (!auth || (!conn->ctrl && !auth->configurator) ||
(!auth->auth_success && !auth->reconfig_success) ||
!conn->gas_comeback_in_progress) {
wpa_printf(MSG_DEBUG, "DPP: No matching exchange in progress");
return -1;
}
wpabuf_put_be32(buf, 18 + wpabuf_len(resp));
dialog_token = msg[0];
if (dialog_token != conn->gas_dialog_token) {
wpa_printf(MSG_DEBUG, "DPP: Dialog token mismatch (%u != %u)",
dialog_token, conn->gas_dialog_token);
return -1;
}
wpabuf_put_u8(buf, WLAN_PA_GAS_INITIAL_RESP);
wpabuf_put_u8(buf, dialog_token);
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
wpabuf_put_le16(buf, 0); /* GAS Comeback Delay */
if (!conn->gas_resp) {
wpa_printf(MSG_DEBUG, "DPP: Certificate not yet ready");
return dpp_tcp_send_comeback_delay(conn,
WLAN_PA_GAS_COMEBACK_RESP);
}
dpp_write_adv_proto(buf);
dpp_write_gas_query(buf, resp);
wpabuf_free(resp);
/* Send Config Response over TCP; GAS fragmentation is taken care of by
* the Relay */
wpa_hexdump_buf(MSG_MSGDUMP, "DPP: Outgoing TCP message", buf);
wpabuf_free(conn->msg_out);
conn->msg_out_pos = 0;
conn->msg_out = buf;
conn->on_tcp_tx_complete_gas_done = 1;
dpp_tcp_send(conn);
return 0;
wpa_printf(MSG_DEBUG,
"DPP: Configuration response is ready to be sent out");
resp = conn->gas_resp;
conn->gas_resp = NULL;
return dpp_tcp_send_gas_resp(conn, WLAN_PA_GAS_COMEBACK_RESP, resp);
}
@ -1369,6 +1445,11 @@ static void dpp_controller_rx(int sd, void *eloop_ctx, void *sock_ctx)
wpabuf_len(conn->msg) - 1) < 0)
dpp_connection_remove(conn);
break;
case WLAN_PA_GAS_COMEBACK_REQ:
if (dpp_controller_rx_gas_comeback_req(
conn, pos + 1, wpabuf_len(conn->msg) - 1) < 0)
dpp_connection_remove(conn);
break;
default:
wpa_printf(MSG_DEBUG, "DPP: Ignore unsupported message type %u",
*pos);