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42 #include <sys/socket.h>
44 #include <netinet/in.h>
47 #include <tid_internal.h>
52 static TID_RESP *tids_create_response (TIDS_INSTANCE *tids, TID_REQ *req)
56 if ((NULL == (resp = talloc_zero(req, TID_RESP)))) {
57 tr_crit("tids_create_response: Error allocating response structure.");
61 resp->result = TID_SUCCESS; /* presume success */
62 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
63 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
64 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
65 tr_crit("tids_create_response: Error allocating fields in response.");
69 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
70 tr_crit("tids_create_response: Error allocating fields in response.");
77 static void tids_destroy_response(TIDS_INSTANCE *tids, TID_RESP *resp)
81 tr_free_name(resp->err_msg);
83 tr_free_name(resp->rp_realm);
85 tr_free_name(resp->realm);
87 tr_free_name(resp->comm);
89 tr_free_name(resp->orig_coi);
94 static int tids_listen (TIDS_INSTANCE *tids, int port)
101 struct sockaddr_storage storage;
102 struct sockaddr_in in4;
105 struct sockaddr_in *saddr = (struct sockaddr_in *) &addr.in4;
107 saddr->sin_port = htons (port);
108 saddr->sin_family = AF_INET;
109 saddr->sin_addr.s_addr = INADDR_ANY;
111 if (0 > (conn = socket (AF_INET, SOCK_STREAM, 0)))
114 setsockopt(conn, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
116 if (0 > (rc = bind (conn, (struct sockaddr *) saddr, sizeof(struct sockaddr_in))))
119 if (0 > (rc = listen(conn, 512)))
122 tr_debug("tids_listen: TID Server listening on port %d", port);
126 /* returns EACCES if authorization is denied */
127 static int tids_auth_cb(gss_name_t clientName, gss_buffer_t displayName,
130 struct tids_instance *inst = (struct tids_instance *) data;
131 TR_NAME name ={(char *) displayName->value,
132 displayName->length};
135 if (0!=inst->auth_handler(clientName, &name, inst->cookie)) {
136 tr_debug("tids_auth_cb: client '%.*s' denied authorization.", name.len, name.buf);
137 result=EACCES; /* denied */
143 /* returns 0 on authorization success, 1 on failure, or -1 in case of error */
144 static int tids_auth_connection (struct tids_instance *inst,
145 int conn, gss_ctx_id_t *gssctx)
148 int auth, autherr = 0;
149 gss_buffer_desc nameBuffer = {0, NULL};
153 nameLen = asprintf(&name, "trustidentity@%s", inst->hostname);
154 nameBuffer.length = nameLen;
155 nameBuffer.value = name;
157 if (rc = gsscon_passive_authenticate(conn, nameBuffer, gssctx, tids_auth_cb, inst)) {
158 tr_debug("tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.", rc);
162 if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
163 tr_debug("tids_auth_connection: Error from gsscon_authorize, rc = %d, autherr = %d.",
169 tr_debug("tids_auth_connection: Connection authenticated, conn = %d.", conn);
171 tr_debug("tids_auth_connection: Authentication failed, conn %d.", conn);
176 static int tids_read_request (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TR_MSG **mreq)
182 if (err = gsscon_read_encrypted_token(conn, *gssctx, &buf, &buflen)) {
188 tr_debug("tids_read_request():Request Received, %u bytes.", (unsigned) buflen);
191 if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
192 tr_debug("tids_read_request():Error decoding request.");
197 /* If this isn't a TID Request, just drop it. */
198 if (TID_REQUEST != (*mreq)->msg_type) {
199 tr_debug("tids_read_request(): Not a TID Request, dropped.");
207 static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
211 /* Check that this is a valid TID Request. If not, send an error return. */
212 if ((!tr_msg_get_req(mreq)) ||
213 (!tr_msg_get_req(mreq)->rp_realm) ||
214 (!tr_msg_get_req(mreq)->realm) ||
215 (!tr_msg_get_req(mreq)->comm)) {
216 tr_notice("tids_handle_request(): Not a valid TID Request.");
217 resp->result = TID_ERROR;
218 resp->err_msg = tr_new_name("Bad request format");
222 tid_req_add_path(tr_msg_get_req(mreq), tids->hostname, tids->tids_port);
224 /* Call the caller's request handler */
225 /* TBD -- Handle different error returns/msgs */
226 if (0 > (rc = (*tids->req_handler)(tids, tr_msg_get_req(mreq), resp, tids->cookie))) {
227 /* set-up an error response */
228 resp->result = TID_ERROR;
229 if (!resp->err_msg) /* Use msg set by handler, if any */
230 resp->err_msg = tr_new_name("Internal processing error");
233 /* set-up a success response */
234 resp->result = TID_SUCCESS;
235 resp->err_msg = NULL; /* No error msg on successful return */
241 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
242 TID_RESP *resp = NULL;
245 /* If we already sent a response, don't send another no matter what. */
249 if (NULL == (resp = tids_create_response(tids, req))) {
250 tr_crit("tids_send_err_response: Can't create response.");
255 /* mark this as an error response, and include the error message */
256 resp->result = TID_ERROR;
257 resp->err_msg = tr_new_name((char *)err_msg);
258 resp->error_path = req->path;
260 rc = tids_send_response(tids, req, resp);
262 tids_destroy_response(tids, resp);
266 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
272 if ((!tids) || (!req) || (!resp))
273 tr_debug("tids_send_response: Invalid parameters.");
275 /* Never send a second response if we already sent one. */
279 mresp.msg_type = TID_RESPONSE;
280 tr_msg_set_resp(&mresp, resp);
282 if (NULL == (resp_buf = tr_msg_encode(&mresp))) {
284 fprintf(stderr, "tids_send_response: Error encoding json response.\n");
290 tr_debug("tids_send_response: Encoded response: %s", resp_buf);
292 /* If external logging is enabled, fire off a message */
293 /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
296 /* Send the response over the connection */
297 if (err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
298 strlen(resp_buf) + 1)) {
299 tr_notice("tids_send_response: Error sending response over connection.");
306 /* indicate that a response has been sent for this request */
314 static void tids_handle_connection (TIDS_INSTANCE *tids, int conn)
317 TID_RESP *resp = NULL;
319 gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
321 if (tids_auth_connection(tids, conn, &gssctx)) {
322 tr_notice("tids_handle_connection: Error authorizing TID Server connection.");
327 tr_debug("tids_handle_connection: Connection authorized!");
329 while (1) { /* continue until an error breaks us out */
331 if (0 > (rc = tids_read_request(tids, conn, &gssctx, &mreq))) {
332 tr_debug("tids_handle_connection: Error from tids_read_request(), rc = %d.", rc);
334 } else if (0 == rc) {
338 /* Put connection information into the request structure */
339 tr_msg_get_req(mreq)->conn = conn;
340 tr_msg_get_req(mreq)->gssctx = gssctx;
342 /* Allocate a response structure and populate common fields */
343 if (NULL == (resp = tids_create_response (tids, tr_msg_get_req(mreq)))) {
344 tr_crit("tids_handle_connection: Error creating response structure.");
345 /* try to send an error */
346 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error creating response.");
350 if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
351 tr_debug("tids_handle_connection: Error from tids_handle_request(), rc = %d.", rc);
352 /* Fall through, to send the response, either way */
355 if (0 > (rc = tids_send_response(tids, tr_msg_get_req(mreq), resp))) {
356 tr_debug("tids_handle_connection: Error from tids_send_response(), rc = %d.", rc);
357 /* if we didn't already send a response, try to send a generic error. */
358 if (!tr_msg_get_req(mreq)->resp_sent)
359 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error sending response.");
360 /* Fall through to free the response, either way. */
363 tids_destroy_response(tids, resp);
368 TIDS_INSTANCE *tids_create (void)
370 TIDS_INSTANCE *tids = NULL;
371 if (tids = malloc(sizeof(TIDS_INSTANCE)))
372 memset(tids, 0, sizeof(TIDS_INSTANCE));
376 /* Get a listener for tids requests, returns its socket fd. Accept
377 * connections with tids_accept() */
378 int tids_get_listener(TIDS_INSTANCE *tids,
379 TIDS_REQ_FUNC *req_handler,
380 tids_auth_func *auth_handler,
381 const char *hostname,
387 tids->tids_port = port;
388 if (0 > (listen = tids_listen(tids, port))) {
390 if (0 == strerror_r(errno, errbuf, 256)) {
391 tr_debug("tids_get_listener: Error opening port %d: %s.", port, errbuf);
393 tr_debug("tids_get_listener: Unknown error openining port %d.", port);
398 /* opening port succeeded */
399 tr_debug("tids_get_listener: Opened port %d.", port);
401 /* make this socket non-blocking */
402 if (0 != fcntl(listen, F_SETFL, O_NONBLOCK)) {
403 tr_debug("tids_get_listener: Error setting O_NONBLOCK.");
410 /* store the caller's request handler & cookie */
411 tids->req_handler = req_handler;
412 tids->auth_handler = auth_handler;
413 tids->hostname = hostname;
414 tids->cookie = cookie;
420 /* Accept and process a connection on a port opened with tids_get_listener() */
421 int tids_accept(TIDS_INSTANCE *tids, int listen)
426 if (0 > (conn = accept(listen, NULL, NULL))) {
427 perror("Error from TIDS Server accept()");
431 if (0 > (pid = fork())) {
432 perror("Error on fork()");
438 tids_handle_connection(tids, conn);
440 exit(0); /* exit to kill forked child process */
445 /* clean up any processes that have completed (TBD: move to main loop?) */
446 while (waitpid(-1, 0, WNOHANG) > 0);
451 /* Process tids requests forever. Should not return except on error. */
452 int tids_start (TIDS_INSTANCE *tids,
453 TIDS_REQ_FUNC *req_handler,
454 tids_auth_func *auth_handler,
455 const char *hostname,
463 tids->tids_port = port;
464 if (0 > (listen = tids_listen(tids, port)))
465 perror ("Error from tids_listen()");
467 /* store the caller's request handler & cookie */
468 tids->req_handler = req_handler;
469 tids->auth_handler = auth_handler;
470 tids->hostname = hostname;
471 tids->cookie = cookie;
473 tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
475 while(1) { /* accept incoming conns until we are stopped */
477 if (0 > (conn = accept(listen, NULL, NULL))) {
478 perror("Error from TIDS Server accept()");
482 if (0 > (pid = fork())) {
483 perror("Error on fork()");
489 tids_handle_connection(tids, conn);
491 exit(0); /* exit to kill forked child process */
496 /* clean up any processes that have completed */
497 while (waitpid(-1, 0, WNOHANG) > 0);
500 return 1; /* should never get here, loops "forever" */
503 void tids_destroy (TIDS_INSTANCE *tids)
505 /* clean up logfiles */