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41 #include <sys/socket.h>
47 #include <tid_internal.h>
51 #include <tr_socket.h>
53 static TID_RESP *tids_create_response (TIDS_INSTANCE *tids, TID_REQ *req)
58 if (NULL == (resp = tid_resp_new(req))) {
59 tr_crit("tids_create_response: Error allocating response structure.");
63 resp->result = TID_SUCCESS; /* presume success */
64 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
65 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
66 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
67 tr_crit("tids_create_response: Error allocating fields in response.");
71 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
72 tr_crit("tids_create_response: Error allocating fields in response.");
80 if ((!success) && (resp!=NULL)) {
87 /* returns EACCES if authorization is denied */
88 static int tids_auth_cb(gss_name_t clientName, gss_buffer_t displayName,
91 struct tids_instance *inst = (struct tids_instance *) data;
92 TR_NAME name ={(char *) displayName->value,
96 if (0!=inst->auth_handler(clientName, &name, inst->cookie)) {
97 tr_debug("tids_auth_cb: client '%.*s' denied authorization.", name.len, name.buf);
98 result=EACCES; /* denied */
104 /* returns 0 on authorization success, 1 on failure, or -1 in case of error */
105 static int tids_auth_connection (TIDS_INSTANCE *inst,
107 gss_ctx_id_t *gssctx)
110 int auth, autherr = 0;
111 gss_buffer_desc nameBuffer = {0, NULL};
115 nameLen = asprintf(&name, "trustidentity@%s", inst->hostname);
116 nameBuffer.length = nameLen;
117 nameBuffer.value = name;
119 if (rc = gsscon_passive_authenticate(conn, nameBuffer, gssctx, tids_auth_cb, inst)) {
120 tr_debug("tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.", rc);
125 nameBuffer.value=NULL; nameBuffer.length=0;
127 if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
128 tr_debug("tids_auth_connection: Error from gsscon_authorize, rc = %d, autherr = %d.",
134 tr_debug("tids_auth_connection: Connection authenticated, conn = %d.", conn);
136 tr_debug("tids_auth_connection: Authentication failed, conn %d.", conn);
141 static int tids_read_request (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TR_MSG **mreq)
147 if (err = gsscon_read_encrypted_token(conn, *gssctx, &buf, &buflen)) {
153 tr_debug("tids_read_request():Request Received, %u bytes.", (unsigned) buflen);
156 if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
157 tr_debug("tids_read_request():Error decoding request.");
162 /* If this isn't a TID Request, just drop it. */
163 if (TID_REQUEST != (*mreq)->msg_type) {
164 tr_debug("tids_read_request(): Not a TID Request, dropped.");
172 static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
176 /* Check that this is a valid TID Request. If not, send an error return. */
177 if ((!tr_msg_get_req(mreq)) ||
178 (!tr_msg_get_req(mreq)->rp_realm) ||
179 (!tr_msg_get_req(mreq)->realm) ||
180 (!tr_msg_get_req(mreq)->comm)) {
181 tr_notice("tids_handle_request(): Not a valid TID Request.");
182 resp->result = TID_ERROR;
183 resp->err_msg = tr_new_name("Bad request format");
187 tr_debug("tids_handle_request: adding self to req path.");
188 tid_req_add_path(tr_msg_get_req(mreq), tids->hostname, tids->tids_port);
190 /* Call the caller's request handler */
191 /* TBD -- Handle different error returns/msgs */
192 if (0 > (rc = (*tids->req_handler)(tids, tr_msg_get_req(mreq), resp, tids->cookie))) {
193 /* set-up an error response */
194 tr_debug("tids_handle_request: req_handler returned error.");
195 resp->result = TID_ERROR;
196 if (!resp->err_msg) /* Use msg set by handler, if any */
197 resp->err_msg = tr_new_name("Internal processing error");
200 /* set-up a success response */
201 tr_debug("tids_handle_request: req_handler returned success.");
202 resp->result = TID_SUCCESS;
203 resp->err_msg = NULL; /* No error msg on successful return */
209 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
210 TID_RESP *resp = NULL;
213 /* If we already sent a response, don't send another no matter what. */
217 if (NULL == (resp = tids_create_response(tids, req))) {
218 tr_crit("tids_send_err_response: Can't create response.");
222 /* mark this as an error response, and include the error message */
223 resp->result = TID_ERROR;
224 resp->err_msg = tr_new_name((char *)err_msg);
225 resp->error_path = req->path;
227 rc = tids_send_response(tids, req, resp);
233 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
239 if ((!tids) || (!req) || (!resp))
240 tr_debug("tids_send_response: Invalid parameters.");
242 /* Never send a second response if we already sent one. */
246 mresp.msg_type = TID_RESPONSE;
247 tr_msg_set_resp(&mresp, resp);
249 if (NULL == (resp_buf = tr_msg_encode(&mresp))) {
251 tr_err("tids_send_response: Error encoding json response.");
257 tr_debug("tids_send_response: Encoded response: %s", resp_buf);
259 /* If external logging is enabled, fire off a message */
260 /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
263 /* Send the response over the connection */
264 if (err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
265 strlen(resp_buf) + 1)) {
266 tr_notice("tids_send_response: Error sending response over connection.");
273 /* indicate that a response has been sent for this request */
281 static void tids_handle_connection (TIDS_INSTANCE *tids, int conn)
284 TID_RESP *resp = NULL;
286 gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
288 if (tids_auth_connection(tids, conn, &gssctx)) {
289 tr_notice("tids_handle_connection: Error authorizing TID Server connection.");
294 tr_debug("tids_handle_connection: Connection authorized!");
296 while (1) { /* continue until an error breaks us out */
298 if (0 > (rc = tids_read_request(tids, conn, &gssctx, &mreq))) {
299 tr_debug("tids_handle_connection: Error from tids_read_request(), rc = %d.", rc);
301 } else if (0 == rc) {
305 /* Put connection information into the request structure */
306 tr_msg_get_req(mreq)->conn = conn;
307 tr_msg_get_req(mreq)->gssctx = gssctx;
309 /* Allocate a response structure and populate common fields */
310 if (NULL == (resp = tids_create_response (tids, tr_msg_get_req(mreq)))) {
311 tr_crit("tids_handle_connection: Error creating response structure.");
312 /* try to send an error */
313 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error creating response.");
314 tr_msg_free_decoded(mreq);
318 if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
319 tr_debug("tids_handle_connection: Error from tids_handle_request(), rc = %d.", rc);
320 /* Fall through, to send the response, either way */
323 if (0 > (rc = tids_send_response(tids, tr_msg_get_req(mreq), resp))) {
324 tr_debug("tids_handle_connection: Error from tids_send_response(), rc = %d.", rc);
325 /* if we didn't already send a response, try to send a generic error. */
326 if (!tr_msg_get_req(mreq)->resp_sent)
327 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error sending response.");
328 /* Fall through to free the response, either way. */
331 tr_msg_free_decoded(mreq); /* takes resp with it */
336 TIDS_INSTANCE *tids_create (void)
338 return talloc_zero(NULL, TIDS_INSTANCE);
341 /* Get a listener for tids requests, returns its socket fd. Accept
342 * connections with tids_accept() */
343 int tids_get_listener(TIDS_INSTANCE *tids,
344 TIDS_REQ_FUNC *req_handler,
345 tids_auth_func *auth_handler,
346 const char *hostname,
355 tids->tids_port = port;
356 n_fd=listen_on_all_addrs(port, fd_out, max_fd);
359 tr_err("tids_get_listener: Error opening port %d");
361 /* opening port succeeded */
362 tr_info("tids_get_listener: Opened port %d.", port);
364 /* make this socket non-blocking */
365 for (ii=0; ii<n_fd; ii++) {
366 if (0 != fcntl(fd_out[ii], F_SETFL, O_NONBLOCK)) {
367 tr_err("tids_get_listener: Error setting O_NONBLOCK.");
368 for (ii=0; ii<n_fd; ii++) {
379 /* store the caller's request handler & cookie */
380 tids->req_handler = req_handler;
381 tids->auth_handler = auth_handler;
382 tids->hostname = hostname;
383 tids->cookie = cookie;
389 /* Accept and process a connection on a port opened with tids_get_listener() */
390 int tids_accept(TIDS_INSTANCE *tids, int listen)
395 if (0 > (conn = accept(listen, NULL, NULL))) {
396 perror("Error from TIDS Server accept()");
400 if (0 > (pid = fork())) {
401 perror("Error on fork()");
407 tids_handle_connection(tids, conn);
409 exit(0); /* exit to kill forked child process */
414 /* clean up any processes that have completed (TBD: move to main loop?) */
415 while (waitpid(-1, 0, WNOHANG) > 0);
420 /* Process tids requests forever. Should not return except on error. */
421 #define MAX_SOCKETS 10
422 int tids_start (TIDS_INSTANCE *tids,
423 TIDS_REQ_FUNC *req_handler,
424 tids_auth_func *auth_handler,
425 const char *hostname,
429 int fd[MAX_SOCKETS]={0};
431 struct pollfd poll_fd[MAX_SOCKETS]={{0}};
434 n_fd=tids_get_listener(tids, req_handler, auth_handler, hostname, port, cookie, fd, MAX_SOCKETS);
436 perror ("Error from tids_listen()");
440 tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
442 /* set up the poll structs */
443 for (ii=0; ii<n_fd; ii++) {
444 poll_fd[ii].fd=fd[ii];
445 poll_fd[ii].events=POLLIN;
448 while(1) { /* accept incoming conns until we are stopped */
449 /* clear out events from previous iteration */
450 for (ii=0; ii<n_fd; ii++)
451 poll_fd[ii].revents=0;
453 /* wait indefinitely for a connection */
454 if (poll(poll_fd, n_fd, -1) < 0) {
455 perror("Error from poll()");
459 /* fork handlers for any sockets that have data */
460 for (ii=0; ii<n_fd; ii++) {
461 if (poll_fd[ii].revents == 0)
464 if ((poll_fd[ii].revents & POLLERR) || (poll_fd[ii].revents & POLLNVAL)) {
465 perror("Error polling fd");
469 if (poll_fd[ii].revents & POLLIN) {
470 if (tids_accept(tids, poll_fd[ii].fd))
471 tr_err("tids_start: error in tids_accept().");
476 return 1; /* should never get here, loops "forever" */
480 void tids_destroy (TIDS_INSTANCE *tids)
482 /* clean up logfiles */