RADIUS: Add DAC implementation in hostapd(AS)
The new DAC_REQUEST control interface command can now be used to request hostapd to send out Disconnect-Request and CoA-Request packets for an existing session. DAC_REQUEST <disconnect|coa> <MAC Address> [t_c_clear] Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen
Jouni Malinen
parent
72aad113c2
commit
abed6136ae
3 changed files with 355 additions and 0 deletions
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@ -3203,6 +3203,11 @@ static int hostapd_ctrl_iface_receive_process(struct hostapd_data *hapd,
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if (hostapd_dpp_pkex_remove(hapd, buf + 16) < 0)
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reply_len = -1;
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#endif /* CONFIG_DPP */
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#ifdef RADIUS_SERVER
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} else if (os_strncmp(buf, "DAC_REQUEST ", 12) == 0) {
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if (radius_server_dac_request(hapd->radius_srv, buf + 12) < 0)
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reply_len = -1;
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#endif /* RADIUS_SERVER */
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} else {
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os_memcpy(reply, "UNKNOWN COMMAND\n", 16);
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reply_len = 16;
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@ -115,6 +115,14 @@ struct radius_client {
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int shared_secret_len;
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struct radius_session *sessions;
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struct radius_server_counters counters;
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u8 next_dac_identifier;
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struct radius_msg *pending_dac_coa_req;
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u8 pending_dac_coa_id;
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u8 pending_dac_coa_addr[ETH_ALEN];
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struct radius_msg *pending_dac_disconnect_req;
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u8 pending_dac_disconnect_id;
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u8 pending_dac_disconnect_addr[ETH_ALEN];
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};
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/**
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@ -1397,6 +1405,116 @@ send_reply:
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}
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static void
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radius_server_receive_disconnect_resp(struct radius_server_data *data,
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struct radius_client *client,
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struct radius_msg *msg, int ack)
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{
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struct radius_hdr *hdr;
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if (!client->pending_dac_disconnect_req) {
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RADIUS_DEBUG("Ignore unexpected Disconnect response");
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radius_msg_free(msg);
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return;
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}
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hdr = radius_msg_get_hdr(msg);
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if (hdr->identifier != client->pending_dac_disconnect_id) {
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RADIUS_DEBUG("Ignore unexpected Disconnect response with unexpected identifier %u (expected %u)",
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hdr->identifier,
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client->pending_dac_disconnect_id);
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radius_msg_free(msg);
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return;
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}
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if (radius_msg_verify(msg, (const u8 *) client->shared_secret,
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client->shared_secret_len,
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client->pending_dac_disconnect_req, 0)) {
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RADIUS_DEBUG("Ignore Disconnect response with invalid authenticator");
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radius_msg_free(msg);
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return;
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}
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RADIUS_DEBUG("Disconnect-%s received for " MACSTR,
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ack ? "ACK" : "NAK",
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MAC2STR(client->pending_dac_disconnect_addr));
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radius_msg_free(msg);
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radius_msg_free(client->pending_dac_disconnect_req);
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client->pending_dac_disconnect_req = NULL;
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}
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static void radius_server_receive_coa_resp(struct radius_server_data *data,
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struct radius_client *client,
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struct radius_msg *msg, int ack)
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{
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struct radius_hdr *hdr;
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#ifdef CONFIG_SQLITE
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char addrtxt[3 * ETH_ALEN];
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char *sql;
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int res;
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#endif /* CONFIG_SQLITE */
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if (!client->pending_dac_coa_req) {
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RADIUS_DEBUG("Ignore unexpected CoA response");
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radius_msg_free(msg);
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return;
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}
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hdr = radius_msg_get_hdr(msg);
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if (hdr->identifier != client->pending_dac_coa_id) {
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RADIUS_DEBUG("Ignore unexpected CoA response with unexpected identifier %u (expected %u)",
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hdr->identifier,
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client->pending_dac_coa_id);
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radius_msg_free(msg);
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return;
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}
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if (radius_msg_verify(msg, (const u8 *) client->shared_secret,
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client->shared_secret_len,
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client->pending_dac_coa_req, 0)) {
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RADIUS_DEBUG("Ignore CoA response with invalid authenticator");
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radius_msg_free(msg);
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return;
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}
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RADIUS_DEBUG("CoA-%s received for " MACSTR,
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ack ? "ACK" : "NAK",
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MAC2STR(client->pending_dac_coa_addr));
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radius_msg_free(msg);
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radius_msg_free(client->pending_dac_coa_req);
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client->pending_dac_coa_req = NULL;
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#ifdef CONFIG_SQLITE
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if (!data->db)
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return;
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os_snprintf(addrtxt, sizeof(addrtxt), MACSTR,
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MAC2STR(client->pending_dac_coa_addr));
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if (ack) {
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sql = sqlite3_mprintf("UPDATE current_sessions SET hs20_t_c_filtering=0, waiting_coa_ack=0, coa_ack_received=1 WHERE mac_addr=%Q",
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addrtxt);
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} else {
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sql = sqlite3_mprintf("UPDATE current_sessions SET waiting_coa_ack=0 WHERE mac_addr=%Q",
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addrtxt);
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}
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if (!sql)
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return;
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res = sqlite3_exec(data->db, sql, NULL, NULL, NULL);
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sqlite3_free(sql);
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if (res != SQLITE_OK) {
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RADIUS_ERROR("Failed to update current_sessions entry: %s",
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sqlite3_errmsg(data->db));
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return;
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}
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#endif /* CONFIG_SQLITE */
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}
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static void radius_server_receive_auth(int sock, void *eloop_ctx,
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void *sock_ctx)
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{
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@ -1477,6 +1595,26 @@ static void radius_server_receive_auth(int sock, void *eloop_ctx,
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radius_msg_dump(msg);
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}
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if (radius_msg_get_hdr(msg)->code == RADIUS_CODE_DISCONNECT_ACK) {
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radius_server_receive_disconnect_resp(data, client, msg, 1);
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return;
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}
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if (radius_msg_get_hdr(msg)->code == RADIUS_CODE_DISCONNECT_NAK) {
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radius_server_receive_disconnect_resp(data, client, msg, 0);
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return;
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}
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if (radius_msg_get_hdr(msg)->code == RADIUS_CODE_COA_ACK) {
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radius_server_receive_coa_resp(data, client, msg, 1);
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return;
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}
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if (radius_msg_get_hdr(msg)->code == RADIUS_CODE_COA_NAK) {
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radius_server_receive_coa_resp(data, client, msg, 0);
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return;
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}
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if (radius_msg_get_hdr(msg)->code != RADIUS_CODE_ACCESS_REQUEST) {
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RADIUS_DEBUG("Unexpected RADIUS code %d",
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radius_msg_get_hdr(msg)->code);
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@ -1737,6 +1875,8 @@ static void radius_server_free_clients(struct radius_server_data *data,
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radius_server_free_sessions(data, prev->sessions);
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os_free(prev->shared_secret);
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radius_msg_free(prev->pending_dac_coa_req);
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radius_msg_free(prev->pending_dac_disconnect_req);
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os_free(prev);
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}
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}
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@ -2388,3 +2528,212 @@ void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
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radius_msg_free(msg);
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}
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#ifdef CONFIG_SQLITE
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struct db_session_fields {
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char *identity;
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char *nas;
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int hs20_t_c_filtering;
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int waiting_coa_ack;
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int coa_ack_received;
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};
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static int get_db_session_fields(void *ctx, int argc, char *argv[], char *col[])
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{
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struct db_session_fields *fields = ctx;
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int i;
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for (i = 0; i < argc; i++) {
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if (!argv[i])
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continue;
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RADIUS_DEBUG("Session DB: %s=%s", col[i], argv[i]);
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if (os_strcmp(col[i], "identity") == 0) {
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os_free(fields->identity);
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fields->identity = os_strdup(argv[i]);
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} else if (os_strcmp(col[i], "nas") == 0) {
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os_free(fields->nas);
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fields->nas = os_strdup(argv[i]);
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} else if (os_strcmp(col[i], "hs20_t_c_filtering") == 0) {
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fields->hs20_t_c_filtering = atoi(argv[i]);
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} else if (os_strcmp(col[i], "waiting_coa_ack") == 0) {
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fields->waiting_coa_ack = atoi(argv[i]);
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} else if (os_strcmp(col[i], "coa_ack_received") == 0) {
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fields->coa_ack_received = atoi(argv[i]);
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}
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}
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return 0;
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}
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static void free_db_session_fields(struct db_session_fields *fields)
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{
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os_free(fields->identity);
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fields->identity = NULL;
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os_free(fields->nas);
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fields->nas = NULL;
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}
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#endif /* CONFIG_SQLITE */
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int radius_server_dac_request(struct radius_server_data *data, const char *req)
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{
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#ifdef CONFIG_SQLITE
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char *sql;
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int res;
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int disconnect;
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const char *pos = req;
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u8 addr[ETH_ALEN];
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char addrtxt[3 * ETH_ALEN];
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int t_c_clear = 0;
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struct db_session_fields fields;
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struct sockaddr_in das;
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struct radius_client *client;
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struct radius_msg *msg;
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struct wpabuf *buf;
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u8 identifier;
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struct os_time now;
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if (!data)
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return -1;
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/* req: <disconnect|coa> <MAC Address> [t_c_clear] */
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if (os_strncmp(pos, "disconnect ", 11) == 0) {
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disconnect = 1;
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pos += 11;
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} else if (os_strncmp(req, "coa ", 4) == 0) {
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disconnect = 0;
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pos += 4;
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} else {
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return -1;
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}
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if (hwaddr_aton(pos, addr))
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return -1;
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pos = os_strchr(pos, ' ');
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if (pos) {
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if (os_strstr(pos, "t_c_clear"))
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t_c_clear = 1;
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}
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if (!disconnect && !t_c_clear) {
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RADIUS_ERROR("DAC request for CoA without any authorization change");
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return -1;
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}
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if (!data->db) {
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RADIUS_ERROR("SQLite database not in use");
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return -1;
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}
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os_snprintf(addrtxt, sizeof(addrtxt), MACSTR, MAC2STR(addr));
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sql = sqlite3_mprintf("SELECT * FROM current_sessions WHERE mac_addr=%Q",
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addrtxt);
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if (!sql)
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return -1;
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os_memset(&fields, 0, sizeof(fields));
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res = sqlite3_exec(data->db, sql, get_db_session_fields, &fields, NULL);
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sqlite3_free(sql);
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if (res != SQLITE_OK) {
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RADIUS_ERROR("Failed to find matching current_sessions entry from sqlite database: %s",
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sqlite3_errmsg(data->db));
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free_db_session_fields(&fields);
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return -1;
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}
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if (!fields.nas) {
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RADIUS_ERROR("No NAS information found from current_sessions");
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free_db_session_fields(&fields);
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return -1;
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}
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os_memset(&das, 0, sizeof(das));
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das.sin_family = AF_INET;
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das.sin_addr.s_addr = inet_addr(fields.nas);
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das.sin_port = htons(3799);
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free_db_session_fields(&fields);
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client = radius_server_get_client(data, &das.sin_addr, 0);
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if (!client) {
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RADIUS_ERROR("No NAS information available to protect the packet");
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return -1;
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}
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identifier = client->next_dac_identifier++;
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msg = radius_msg_new(disconnect ? RADIUS_CODE_DISCONNECT_REQUEST :
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RADIUS_CODE_COA_REQUEST, identifier);
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if (!msg)
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return -1;
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os_snprintf(addrtxt, sizeof(addrtxt), RADIUS_802_1X_ADDR_FORMAT,
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MAC2STR(addr));
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if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
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(u8 *) addrtxt, os_strlen(addrtxt))) {
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RADIUS_ERROR("Could not add Calling-Station-Id");
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radius_msg_free(msg);
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return -1;
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}
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if (!disconnect && t_c_clear) {
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u8 val[4] = { 0x00, 0x00, 0x00, 0x00 }; /* E=0 */
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if (!radius_msg_add_wfa(
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msg, RADIUS_VENDOR_ATTR_WFA_HS20_T_C_FILTERING,
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val, sizeof(val))) {
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RADIUS_DEBUG("Failed to add WFA-HS20-T-C-Filtering");
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radius_msg_free(msg);
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return -1;
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}
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}
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os_get_time(&now);
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if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_EVENT_TIMESTAMP,
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now.sec)) {
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RADIUS_ERROR("Failed to add Event-Timestamp attribute");
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radius_msg_free(msg);
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return -1;
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}
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radius_msg_finish_acct(msg, (u8 *) client->shared_secret,
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client->shared_secret_len);
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if (wpa_debug_level <= MSG_MSGDUMP)
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radius_msg_dump(msg);
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buf = radius_msg_get_buf(msg);
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if (sendto(data->auth_sock, wpabuf_head(buf), wpabuf_len(buf), 0,
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(struct sockaddr *) &das, sizeof(das)) < 0) {
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RADIUS_ERROR("Failed to send packet - sendto: %s",
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strerror(errno));
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radius_msg_free(msg);
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return -1;
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}
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if (disconnect) {
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radius_msg_free(client->pending_dac_disconnect_req);
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client->pending_dac_disconnect_req = msg;
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client->pending_dac_disconnect_id = identifier;
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os_memcpy(client->pending_dac_disconnect_addr, addr, ETH_ALEN);
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} else {
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radius_msg_free(client->pending_dac_coa_req);
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client->pending_dac_coa_req = msg;
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client->pending_dac_coa_id = identifier;
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os_memcpy(client->pending_dac_coa_addr, addr, ETH_ALEN);
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}
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return 0;
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#else /* CONFIG_SQLITE */
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return -1;
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#endif /* CONFIG_SQLITE */
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}
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@ -248,5 +248,6 @@ int radius_server_get_mib(struct radius_server_data *data, char *buf,
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size_t buflen);
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void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx);
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int radius_server_dac_request(struct radius_server_data *data, const char *req);
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#endif /* RADIUS_SERVER_H */
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