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40 #include <sys/socket.h>
45 #include <tid_internal.h>
49 #include <tr_socket.h>
52 #include <sys/resource.h>
55 * Create a response with minimal fields filled in
57 * @param mem_ctx talloc context for the return value
58 * @param req request to respond to
59 * @return new response structure allocated in the mem_ctx context
61 static TID_RESP *tids_create_response(TALLOC_CTX *mem_ctx, TID_REQ *req)
66 if (NULL == (resp = tid_resp_new(mem_ctx))) {
67 tr_crit("tids_create_response: Error allocating response structure.");
71 resp->result = TID_SUCCESS; /* presume success */
72 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
73 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
74 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
75 tr_crit("tids_create_response: Error allocating fields in response.");
79 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
80 tr_crit("tids_create_response: Error allocating fields in response.");
84 if (req->request_id) {
85 if (NULL == (resp->request_id = tr_dup_name(req->request_id))) {
86 tr_crit("tids_create_response: Error allocating fields in response.");
94 if ((!success) && (resp!=NULL)) {
101 static int tids_handle_request(TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
105 /* Check that this is a valid TID Request. If not, send an error return. */
107 (!(req->rp_realm)) ||
110 tr_notice("tids_handle_request(): Not a valid TID Request.");
111 tid_resp_set_result(resp, TID_ERROR);
112 tid_resp_set_err_msg(resp, tr_new_name("Bad request format"));
116 tr_debug("tids_handle_request: adding self to req path.");
117 tid_req_add_path(req, tids->hostname, tids->tids_port);
119 /* Call the caller's request handler */
120 /* TBD -- Handle different error returns/msgs */
121 if (0 > (rc = (*tids->req_handler)(tids, req, resp, tids->cookie))) {
122 /* set-up an error response */
123 tr_debug("tids_handle_request: req_handler returned error.");
124 tid_resp_set_result(resp, TID_ERROR);
125 if (!tid_resp_get_err_msg(resp)) /* Use msg set by handler, if any */
126 tid_resp_set_err_msg(resp, tr_new_name("Internal processing error"));
128 /* set-up a success response */
129 tr_debug("tids_handle_request: req_handler returned success.");
130 tid_resp_set_result(resp, TID_SUCCESS);
131 resp->err_msg = NULL; /* No error msg on successful return */
138 * Produces a JSON-encoded msg containing the TID response
140 * @param mem_ctx talloc context for the return value
141 * @param resp outgoing response
142 * @return JSON-encoded message containing the TID response
144 static char *tids_encode_response(TALLOC_CTX *mem_ctx, TID_RESP *resp)
147 char *resp_buf = NULL;
149 /* Construct the response message */
150 mresp.msg_type = TID_RESPONSE;
151 tr_msg_set_resp(&mresp, resp);
153 /* Encode the message to JSON */
154 resp_buf = tr_msg_encode(mem_ctx, &mresp);
155 if (resp_buf == NULL) {
156 tr_err("tids_encode_response: Error encoding json response.");
159 tr_debug("tids_encode_response: Encoded response: %s", resp_buf);
166 * Encode/send an error response
168 * Part of the public interface
175 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
176 TID_RESP *resp = NULL;
179 if ((!tids) || (!req) || (!err_msg)) {
180 tr_debug("tids_send_err_response: Invalid parameters.");
184 /* If we already sent a response, don't send another no matter what. */
188 if (NULL == (resp = tids_create_response(req, req))) {
189 tr_crit("tids_send_err_response: Can't create response.");
193 /* mark this as an error response, and include the error message */
194 resp->result = TID_ERROR;
195 resp->err_msg = tr_new_name((char *)err_msg);
196 resp->error_path = req->path;
198 rc = tids_send_response(tids, req, resp);
205 * Encode/send a response
207 * Part of the public interface
209 * @param tids not actually used, but kept for ABI compatibility
214 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
219 if ((!tids) || (!req) || (!resp)) {
220 tr_debug("tids_send_response: Invalid parameters.");
224 /* Never send a second response if we already sent one. */
228 resp_buf = tids_encode_response(NULL, NULL);
229 if (resp_buf == NULL) {
230 tr_err("tids_send_response: Error encoding json response.");
235 tr_debug("tids_send_response: Encoded response: %s", resp_buf);
237 /* If external logging is enabled, fire off a message */
238 /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
241 /* Send the response over the connection */
242 err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
243 strlen(resp_buf) + 1);
245 tr_notice("tids_send_response: Error sending response over connection.");
250 /* indicate that a response has been sent for this request */
259 * Callback to process a request and produce a response
261 * @param req_str JSON-encoded request
262 * @param data pointer to a TIDS_INSTANCE
263 * @return pointer to the response string or null to send no response
265 static TR_GSS_RC tids_req_cb(TALLOC_CTX *mem_ctx, TR_MSG *mreq, TR_MSG **mresp, void *data)
267 TALLOC_CTX *tmp_ctx = talloc_new(NULL);
268 TIDS_INSTANCE *tids = talloc_get_type_abort(data, TIDS_INSTANCE);
270 TID_RESP *resp = NULL;
271 TR_GSS_RC rc = TR_GSS_ERROR;
273 /* If this isn't a TID Request, just drop it. */
274 if (mreq->msg_type != TID_REQUEST) {
275 tr_debug("tids_req_cb: Not a TID request, dropped.");
276 rc = TR_GSS_INTERNAL_ERROR;
280 /* Get a handle on the request itself. Don't free req - it belongs to mreq */
281 req = tr_msg_get_req(mreq);
283 /* Allocate a response message */
284 *mresp = talloc(tmp_ctx, TR_MSG);
285 if (*mresp == NULL) {
286 /* We cannot create a response message, so all we can really do is emit
287 * an error message and return. */
288 tr_crit("tids_req_cb: Error allocating response message.");
289 rc = TR_GSS_INTERNAL_ERROR;
293 /* Allocate a response structure and populate common fields. Put it in the
294 * response message's talloc context. */
295 resp = tids_create_response(mresp, req);
297 /* If we were unable to create a response, we cannot reply. Log an
298 * error if we can, then drop the request. */
299 tr_crit("tids_req_cb: Error creating response structure.");
300 *mresp = NULL; /* the contents are in tmp_ctx, so they will still be cleaned up */
301 rc = TR_GSS_INTERNAL_ERROR;
304 /* Now officially assign the response to the message. */
305 tr_msg_set_resp(*mresp, resp);
307 /* Handle the request and fill in resp */
308 if (tids_handle_request(tids, req, resp) >= 0)
311 /* The TID request was an error response */
312 tr_debug("tids_req_cb: Error from tids_handle_request");
313 rc = TR_GSS_REQUEST_FAILED;
314 /* Fall through, to send the response, either way */
317 /* put the response message in the caller's context */
318 talloc_steal(mem_ctx, *mresp);
321 talloc_free(tmp_ctx);
325 static int tids_destructor(void *object)
327 TIDS_INSTANCE *tids = talloc_get_type_abort(object, TIDS_INSTANCE);
329 g_array_unref(tids->pids);
333 TIDS_INSTANCE *tids_new(TALLOC_CTX *mem_ctx)
335 TIDS_INSTANCE *tids = talloc_zero(mem_ctx, TIDS_INSTANCE);
337 tids->pids = g_array_new(FALSE, FALSE, sizeof(struct tid_process));
338 if (tids->pids == NULL) {
342 talloc_set_destructor((void *)tids, tids_destructor);
348 * Create a new TIDS instance
350 * Deprecated: exists for ABI compatibility, but tids_new() should be used instead
353 TIDS_INSTANCE *tids_create(void)
355 return tids_new(NULL);
358 /* Get a listener for tids requests, returns its socket fd. Accept
359 * connections with tids_accept() */
360 nfds_t tids_get_listener(TIDS_INSTANCE *tids,
361 TIDS_REQ_FUNC *req_handler,
362 tids_auth_func *auth_handler,
363 const char *hostname,
372 tids->tids_port = port;
373 n_fd = tr_sock_listen_all(port, fd_out, max_fd);
376 tr_err("tids_get_listener: Error opening port %d", port);
378 /* opening port succeeded */
379 tr_info("tids_get_listener: Opened port %d.", port);
381 /* make this socket non-blocking */
382 for (ii=0; ii<n_fd; ii++) {
383 if (0 != fcntl(fd_out[ii], F_SETFL, O_NONBLOCK)) {
384 tr_err("tids_get_listener: Error setting O_NONBLOCK.");
385 for (ii=0; ii<n_fd; ii++) {
396 /* store the caller's request handler & cookie */
397 tids->req_handler = req_handler;
398 tids->auth_handler = auth_handler;
399 tids->hostname = hostname;
400 tids->cookie = cookie;
406 /* Strings used to report results from the handler process. The
407 * TIDS_MAX_MESSAGE_LEN must be longer than the longest message, including
408 * null termination (i.e., strlen() + 1) */
409 #define TIDS_MAX_MESSAGE_LEN (10)
410 #define TIDS_SUCCESS_MESSAGE "OK" /* a success message was sent */
411 #define TIDS_ERROR_MESSAGE "ERR" /* an error message was sent */
412 #define TIDS_REQ_FAIL_MESSAGE "FAIL" /* sending failed */
415 * Process to handle an incoming TIDS request
417 * This should be run in the child process after a fork(). Handles
418 * the request, writes the result to result_fd, and terminates.
419 * Never returns to the caller.
421 * @param tids TID server instance
422 * @param conn_fd file descriptor for the incoming connection
423 * @param result_fd writable file descriptor for the result, or 0 to disable reporting
425 static void tids_handle_proc(TIDS_INSTANCE *tids, int conn_fd, int result_fd)
427 const char *response_message = NULL;
428 struct rlimit rlim; /* for disabling core dump */
430 switch(tr_gss_handle_connection(conn_fd,
431 "trustidentity", tids->hostname, /* acceptor name */
432 tids->auth_handler, tids->cookie, /* auth callback and cookie */
433 tids_req_cb, tids /* req callback and cookie */
436 response_message = TIDS_SUCCESS_MESSAGE;
439 case TR_GSS_REQUEST_FAILED:
440 response_message = TIDS_ERROR_MESSAGE;
443 case TR_GSS_INTERNAL_ERROR:
446 response_message = TIDS_REQ_FAIL_MESSAGE;
450 if (0 != result_fd) {
451 /* write strlen + 1 to include the null termination */
452 if (write(result_fd, response_message, strlen(response_message) + 1) < 0)
453 tr_err("tids_accept: child process unable to write to pipe");
459 /* This ought to be an exit(0), but log4shib does not play well with fork() due to
460 * threading issues. To ensure we do not get stuck in the exit handler, we will
461 * abort. First disable core dump for this subprocess (the main process will still
462 * dump core if the environment allows). */
463 rlim.rlim_cur = 0; /* max core size of 0 */
464 rlim.rlim_max = 0; /* prevent the core size limit from being raised later */
465 setrlimit(RLIMIT_CORE, &rlim);
466 abort(); /* exit hard */
469 /* Accept and process a connection on a port opened with tids_get_listener() */
470 int tids_accept(TIDS_INSTANCE *tids, int listen)
475 struct tid_process tp = {0};
477 if (0 > (conn = tr_sock_accept(listen))) {
478 tr_debug("tids_accept: Error accepting connection");
482 if (0 > pipe(pipe_fd)) {
483 perror("Error on pipe()");
486 /* pipe_fd[0] is for reading, pipe_fd[1] is for writing */
488 if (0 > (pid = fork())) {
489 perror("Error on fork()");
494 /* Only the child process gets here */
495 close(pipe_fd[0]); /* close the read end of the pipe, the child only writes */
496 close(listen); /* close the child process's handle on the listen port */
498 tids_handle_proc(tids, conn, pipe_fd[1]); /* never returns */
501 /* Only the parent process gets here */
502 close(pipe_fd[1]); /* close the write end of the pipe, the parent only listens */
503 close(conn); /* connection belongs to the child, so close parent's handle */
505 /* remember the PID of our child process */
506 tr_info("tids_accept: Spawned TID process %d to handle incoming connection.", pid);
508 tp.read_fd = pipe_fd[0];
509 g_array_append_val(tids->pids, tp);
511 /* clean up any processes that have completed */
512 tids_sweep_procs(tids);
517 * Clean up any finished TID request processes
519 * This is called by the main process after forking each TID request. If you want to be
520 * sure finished processes are cleaned up promptly even during a lull in TID requests,
521 * this can be called from the main thread of the main process. It is not thread-safe,
522 * so should not be used from sub-threads. It should not be called by child processes -
523 * this would probably be harmless but ineffective.
527 void tids_sweep_procs(TIDS_INSTANCE *tids)
530 struct tid_process tp = {0};
531 char result[TIDS_MAX_MESSAGE_LEN] = {0};
536 /* loop backwards over the array so we can remove elements as we go */
537 for (ii=tids->pids->len; ii > 0; ii--) {
538 /* ii-1 is the current index - get our own copy, we may destroy the list's copy */
539 tp = g_array_index(tids->pids, struct tid_process, ii-1);
541 wait_rc = waitpid(tp.pid, &status, WNOHANG);
543 continue; /* process still running */
546 /* invalid options will probably keep being invalid, report that condition */
548 tr_crit("tids_sweep_procs: waitpid called with invalid options");
550 /* If we got ECHILD, that means the PID was invalid; we'll assume the process was
551 * terminated and we missed it. For all other errors, move on
552 * to the next PID to check. */
556 tr_warning("tid_sweep_procs: TID process %d disappeared", tp.pid);
559 /* remove the item (we still have a copy of the data) */
560 g_array_remove_index_fast(tids->pids, ii-1); /* disturbs only indices >= ii-1 which we've already handled */
562 /* Report exit status unless we got ECHILD above or somehow waitpid returned the wrong pid */
563 if (wait_rc == tp.pid) {
564 if (WIFEXITED(status)) {
565 tr_debug("tids_sweep_procs: TID process %d exited with status %d.", tp.pid, WTERMSIG(status));
566 } else if (WIFSIGNALED(status)) {
567 tr_debug("tids_sweep_procs: TID process %d terminated by signal %d.", tp.pid, WTERMSIG(status));
569 } else if (wait_rc > 0) {
570 tr_err("tids_sweep_procs: waitpid returned pid %d, expected %d", wait_rc, tp.pid);
573 /* read the pipe - if the TID request worked, it will have written status before terminating */
574 result_len = read(tp.read_fd, result, TIDS_MAX_MESSAGE_LEN);
577 if ((result_len > 0) && (strcmp(result, TIDS_SUCCESS_MESSAGE) == 0)) {
579 tr_info("tids_sweep_procs: TID process %d exited after successful request.", tp.pid);
580 } else if ((result_len > 0) && (strcmp(result, TIDS_ERROR_MESSAGE) == 0)) {
581 tids->req_error_count++;
582 tr_info("tids_sweep_procs: TID process %d exited after unsuccessful request.", tp.pid);
585 tr_info("tids_sweep_procs: TID process %d exited with an error.", tp.pid);
590 /* Process tids requests forever. Should not return except on error. */
591 int tids_start(TIDS_INSTANCE *tids,
592 TIDS_REQ_FUNC *req_handler,
593 tids_auth_func *auth_handler,
594 const char *hostname,
598 int fd[TR_MAX_SOCKETS]={0};
600 struct pollfd poll_fd[TR_MAX_SOCKETS]={{0}};
603 n_fd = tids_get_listener(tids, req_handler, auth_handler, hostname, port, cookie, fd, TR_MAX_SOCKETS);
605 perror ("Error from tids_listen()");
609 tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
611 /* set up the poll structs */
612 for (ii=0; ii<n_fd; ii++) {
613 poll_fd[ii].fd=fd[ii];
614 poll_fd[ii].events=POLLIN;
617 while(1) { /* accept incoming conns until we are stopped */
618 /* clear out events from previous iteration */
619 for (ii=0; ii<n_fd; ii++)
620 poll_fd[ii].revents=0;
622 /* wait indefinitely for a connection */
623 if (poll(poll_fd, n_fd, -1) < 0) {
624 perror("Error from poll()");
628 /* fork handlers for any sockets that have data */
629 for (ii=0; ii<n_fd; ii++) {
630 if (poll_fd[ii].revents == 0)
633 if ((poll_fd[ii].revents & POLLERR) || (poll_fd[ii].revents & POLLNVAL)) {
634 perror("Error polling fd");
638 if (poll_fd[ii].revents & POLLIN) {
639 if (tids_accept(tids, poll_fd[ii].fd))
640 tr_debug("tids_start: error in tids_accept().");
645 return 1; /* should never get here, loops "forever" */
648 void tids_destroy (TIDS_INSTANCE *tids)
650 /* clean up logfiles */