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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 (TIDS_INSTANCE *inst,
146 gss_ctx_id_t *gssctx)
149 int auth, autherr = 0;
150 gss_buffer_desc nameBuffer = {0, NULL};
154 nameLen = asprintf(&name, "trustidentity@%s", inst->hostname);
155 nameBuffer.length = nameLen;
156 nameBuffer.value = name;
158 if (rc = gsscon_passive_authenticate(conn, nameBuffer, gssctx, tids_auth_cb, inst)) {
159 tr_debug("tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.", rc);
163 if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
164 tr_debug("tids_auth_connection: Error from gsscon_authorize, rc = %d, autherr = %d.",
170 tr_debug("tids_auth_connection: Connection authenticated, conn = %d.", conn);
172 tr_debug("tids_auth_connection: Authentication failed, conn %d.", conn);
177 static int tids_read_request (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TR_MSG **mreq)
183 if (err = gsscon_read_encrypted_token(conn, *gssctx, &buf, &buflen)) {
189 tr_debug("tids_read_request():Request Received, %u bytes.", (unsigned) buflen);
192 if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
193 tr_debug("tids_read_request():Error decoding request.");
198 /* If this isn't a TID Request, just drop it. */
199 if (TID_REQUEST != (*mreq)->msg_type) {
200 tr_debug("tids_read_request(): Not a TID Request, dropped.");
208 static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
212 /* Check that this is a valid TID Request. If not, send an error return. */
213 if ((!tr_msg_get_req(mreq)) ||
214 (!tr_msg_get_req(mreq)->rp_realm) ||
215 (!tr_msg_get_req(mreq)->realm) ||
216 (!tr_msg_get_req(mreq)->comm)) {
217 tr_notice("tids_handle_request(): Not a valid TID Request.");
218 resp->result = TID_ERROR;
219 resp->err_msg = tr_new_name("Bad request format");
223 tid_req_add_path(tr_msg_get_req(mreq), tids->hostname, tids->tids_port);
225 /* Call the caller's request handler */
226 /* TBD -- Handle different error returns/msgs */
227 if (0 > (rc = (*tids->req_handler)(tids, tr_msg_get_req(mreq), resp, tids->cookie))) {
228 /* set-up an error response */
229 resp->result = TID_ERROR;
230 if (!resp->err_msg) /* Use msg set by handler, if any */
231 resp->err_msg = tr_new_name("Internal processing error");
234 /* set-up a success response */
235 resp->result = TID_SUCCESS;
236 resp->err_msg = NULL; /* No error msg on successful return */
242 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
243 TID_RESP *resp = NULL;
246 /* If we already sent a response, don't send another no matter what. */
250 if (NULL == (resp = tids_create_response(tids, req))) {
251 tr_crit("tids_send_err_response: Can't create response.");
256 /* mark this as an error response, and include the error message */
257 resp->result = TID_ERROR;
258 resp->err_msg = tr_new_name((char *)err_msg);
259 resp->error_path = req->path;
261 rc = tids_send_response(tids, req, resp);
263 tids_destroy_response(tids, resp);
267 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
273 if ((!tids) || (!req) || (!resp))
274 tr_debug("tids_send_response: Invalid parameters.");
276 /* Never send a second response if we already sent one. */
280 mresp.msg_type = TID_RESPONSE;
281 tr_msg_set_resp(&mresp, resp);
283 if (NULL == (resp_buf = tr_msg_encode(&mresp))) {
285 fprintf(stderr, "tids_send_response: Error encoding json response.\n");
291 tr_debug("tids_send_response: Encoded response: %s", resp_buf);
293 /* If external logging is enabled, fire off a message */
294 /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
297 /* Send the response over the connection */
298 if (err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
299 strlen(resp_buf) + 1)) {
300 tr_notice("tids_send_response: Error sending response over connection.");
307 /* indicate that a response has been sent for this request */
315 static void tids_handle_connection (TIDS_INSTANCE *tids, int conn)
318 TID_RESP *resp = NULL;
320 gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
322 if (tids_auth_connection(tids, conn, &gssctx)) {
323 tr_notice("tids_handle_connection: Error authorizing TID Server connection.");
328 tr_debug("tids_handle_connection: Connection authorized!");
330 while (1) { /* continue until an error breaks us out */
332 if (0 > (rc = tids_read_request(tids, conn, &gssctx, &mreq))) {
333 tr_debug("tids_handle_connection: Error from tids_read_request(), rc = %d.", rc);
335 } else if (0 == rc) {
339 /* Put connection information into the request structure */
340 tr_msg_get_req(mreq)->conn = conn;
341 tr_msg_get_req(mreq)->gssctx = gssctx;
343 /* Allocate a response structure and populate common fields */
344 if (NULL == (resp = tids_create_response (tids, tr_msg_get_req(mreq)))) {
345 tr_crit("tids_handle_connection: Error creating response structure.");
346 /* try to send an error */
347 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error creating response.");
351 if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
352 tr_debug("tids_handle_connection: Error from tids_handle_request(), rc = %d.", rc);
353 /* Fall through, to send the response, either way */
356 if (0 > (rc = tids_send_response(tids, tr_msg_get_req(mreq), resp))) {
357 tr_debug("tids_handle_connection: Error from tids_send_response(), rc = %d.", rc);
358 /* if we didn't already send a response, try to send a generic error. */
359 if (!tr_msg_get_req(mreq)->resp_sent)
360 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error sending response.");
361 /* Fall through to free the response, either way. */
364 tids_destroy_response(tids, resp);
369 TIDS_INSTANCE *tids_create (TALLOC_CTX *mem_ctx)
371 return talloc_zero(mem_ctx, TIDS_INSTANCE);
374 /* Get a listener for tids requests, returns its socket fd. Accept
375 * connections with tids_accept() */
376 int tids_get_listener(TIDS_INSTANCE *tids,
377 TIDS_REQ_FUNC *req_handler,
378 tids_auth_func *auth_handler,
379 const char *hostname,
385 tids->tids_port = port;
386 if (0 > (listen = tids_listen(tids, port))) {
388 if (0 == strerror_r(errno, errbuf, 256)) {
389 tr_debug("tids_get_listener: Error opening port %d: %s.", port, errbuf);
391 tr_debug("tids_get_listener: Unknown error openining port %d.", port);
396 /* opening port succeeded */
397 tr_debug("tids_get_listener: Opened port %d.", port);
399 /* make this socket non-blocking */
400 if (0 != fcntl(listen, F_SETFL, O_NONBLOCK)) {
401 tr_debug("tids_get_listener: Error setting O_NONBLOCK.");
408 /* store the caller's request handler & cookie */
409 tids->req_handler = req_handler;
410 tids->auth_handler = auth_handler;
411 tids->hostname = hostname;
412 tids->cookie = cookie;
418 /* Accept and process a connection on a port opened with tids_get_listener() */
419 int tids_accept(TIDS_INSTANCE *tids, int listen)
424 if (0 > (conn = accept(listen, NULL, NULL))) {
425 perror("Error from TIDS Server accept()");
429 if (0 > (pid = fork())) {
430 perror("Error on fork()");
436 tids_handle_connection(tids, conn);
438 exit(0); /* exit to kill forked child process */
443 /* clean up any processes that have completed (TBD: move to main loop?) */
444 while (waitpid(-1, 0, WNOHANG) > 0);
449 /* Process tids requests forever. Should not return except on error. */
450 int tids_start (TIDS_INSTANCE *tids,
451 TIDS_REQ_FUNC *req_handler,
452 tids_auth_func *auth_handler,
453 const char *hostname,
461 tids->tids_port = port;
462 if (0 > (listen = tids_listen(tids, port)))
463 perror ("Error from tids_listen()");
465 /* store the caller's request handler & cookie */
466 tids->req_handler = req_handler;
467 tids->auth_handler = auth_handler;
468 tids->hostname = hostname;
469 tids->cookie = cookie;
471 tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
473 while(1) { /* accept incoming conns until we are stopped */
475 if (0 > (conn = accept(listen, NULL, NULL))) {
476 perror("Error from TIDS Server accept()");
480 if (0 > (pid = fork())) {
481 perror("Error on fork()");
487 tids_handle_connection(tids, conn);
489 exit(0); /* exit to kill forked child process */
494 /* clean up any processes that have completed */
495 while (waitpid(-1, 0, WNOHANG) > 0);
498 return 1; /* should never get here, loops "forever" */
501 void tids_destroy (TIDS_INSTANCE *tids)
503 /* clean up logfiles */