2 * Copyright (c) 2012, JANET(UK)
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6 * modification, are permitted provided that the following conditions
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10 * notice, this list of conditions and the following disclaimer.
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17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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41 #include <sys/socket.h>
43 #include <netinet/in.h>
46 #include <tid_internal.h>
51 static TID_RESP *tids_create_response (TIDS_INSTANCE *tids, TID_REQ *req)
55 if ((NULL == (resp = talloc_zero(req, TID_RESP)))) {
56 fprintf(stderr, "tids_create_response: Error allocating response structure.\n");
60 resp->result = TID_SUCCESS; /* presume success */
61 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
62 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
63 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
64 fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
68 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
69 fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
76 static void tids_destroy_response(TIDS_INSTANCE *tids, TID_RESP *resp)
80 tr_free_name(resp->err_msg);
82 tr_free_name(resp->rp_realm);
84 tr_free_name(resp->realm);
86 tr_free_name(resp->comm);
88 tr_free_name(resp->orig_coi);
93 static int tids_listen (TIDS_INSTANCE *tids, int port)
100 struct sockaddr_storage storage;
101 struct sockaddr_in in4;
104 struct sockaddr_in *saddr = (struct sockaddr_in *) &addr.in4;
106 saddr->sin_port = htons (port);
107 saddr->sin_family = AF_INET;
108 saddr->sin_addr.s_addr = INADDR_ANY;
110 if (0 > (conn = socket (AF_INET, SOCK_STREAM, 0)))
113 setsockopt(conn, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
115 if (0 > (rc = bind (conn, (struct sockaddr *) saddr, sizeof(struct sockaddr_in))))
118 if (0 > (rc = listen(conn, 512)))
121 fprintf (stdout, "tids_listen: TID Server listening on port %d\n", port);
125 static int tids_auth_cb(gss_name_t clientName, gss_buffer_t displayName,
128 struct tids_instance *inst = (struct tids_instance *) data;
129 TR_NAME name ={(char *) displayName->value,
130 displayName->length};
131 return inst->auth_handler(clientName, &name, inst->cookie);
134 static int tids_auth_connection (struct tids_instance *inst,
135 int conn, gss_ctx_id_t *gssctx)
138 int auth, autherr = 0;
139 gss_buffer_desc nameBuffer = {0, NULL};
143 nameLen = asprintf(&name, "trustidentity@%s", inst->hostname);
144 nameBuffer.length = nameLen;
145 nameBuffer.value = name;
147 if (rc = gsscon_passive_authenticate(conn, nameBuffer, gssctx, tids_auth_cb, inst)) {
148 fprintf(stderr, "tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.\n", rc);
152 if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
153 fprintf(stderr, "tids_auth_connection: Error from gsscon_authorize, rc = %d, autherr = %d.\n",
159 fprintf(stdout, "tids_auth_connection: Connection authenticated, conn = %d.\n", conn);
161 fprintf(stderr, "tids_auth_connection: Authentication failed, conn %d.\n", conn);
166 static int tids_read_request (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TR_MSG **mreq)
172 if (err = gsscon_read_encrypted_token(conn, *gssctx, &buf, &buflen)) {
178 fprintf(stdout, "tids_read_request():Request Received, %u bytes.\n", (unsigned) buflen);
181 if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
182 fprintf(stderr, "tids_read_request():Error decoding request.\n");
187 /* If this isn't a TID Request, just drop it. */
188 if (TID_REQUEST != (*mreq)->msg_type) {
189 fprintf(stderr, "tids_read_request(): Not a TID Request, dropped.\n");
197 static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
201 /* Check that this is a valid TID Request. If not, send an error return. */
202 if ((!tr_msg_get_req(mreq)) ||
203 (!tr_msg_get_req(mreq)->rp_realm) ||
204 (!tr_msg_get_req(mreq)->realm) ||
205 (!tr_msg_get_req(mreq)->comm)) {
206 fprintf(stderr, "tids_handle_request():Not a valid TID Request.\n");
207 resp->result = TID_ERROR;
208 resp->err_msg = tr_new_name("Bad request format");
212 /* Call the caller's request handler */
213 /* TBD -- Handle different error returns/msgs */
214 if (0 > (rc = (*tids->req_handler)(tids, tr_msg_get_req(mreq), resp, tids->cookie))) {
215 /* set-up an error response */
216 resp->result = TID_ERROR;
217 if (!resp->err_msg) /* Use msg set by handler, if any */
218 resp->err_msg = tr_new_name("Internal processing error");
221 /* set-up a success response */
222 resp->result = TID_SUCCESS;
223 resp->err_msg = NULL; /* No error msg on successful return */
229 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
230 TID_RESP *resp = NULL;
233 /* If we already sent a response, don't send another no matter what. */
237 if (NULL == (resp = tids_create_response(tids, req))) {
238 fprintf(stderr, "tids_send_err_response: Can't create response.\n");
242 /* mark this as an error response, and include the error message */
243 resp->result = TID_ERROR;
244 resp->err_msg = tr_new_name((char *)err_msg);
246 rc = tids_send_response(tids, req, resp);
248 tids_destroy_response(tids, resp);
252 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
258 if ((!tids) || (!req) || (!resp))
259 fprintf (stderr, "tids_send_response: Invalid parameters.\n");
261 /* Never send a second response if we already sent one. */
265 mresp.msg_type = TID_RESPONSE;
266 tr_msg_set_resp(&mresp, resp);
268 if (NULL == (resp_buf = tr_msg_encode(&mresp))) {
269 fprintf(stderr, "tids_send_response: Error encoding json response.\n");
275 fprintf(stderr, "tids_send_response: Encoded response:\n%s\n", resp_buf);
277 /* If external logging is enabled, fire off a message */
278 /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
281 /* Send the response over the connection */
282 if (err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
283 strlen(resp_buf) + 1)) {
284 fprintf(stderr, "tids_send_response: Error sending response over connection.\n");
291 /* indicate that a response has been sent for this request */
299 static void tids_handle_connection (TIDS_INSTANCE *tids, int conn)
302 TID_RESP *resp = NULL;
304 gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
306 if (tids_auth_connection(tids, conn, &gssctx)) {
307 fprintf(stderr, "tids_handle_connection: Error authorizing TID Server connection.\n");
312 fprintf(stdout, "tids_handle_connection: Connection authorized!\n");
314 while (1) { /* continue until an error breaks us out */
316 if (0 > (rc = tids_read_request(tids, conn, &gssctx, &mreq))) {
317 fprintf(stderr, "tids_handle_connection: Error from tids_read_request(), rc = %d.\n", rc);
319 } else if (0 == rc) {
323 /* Put connection information into the request structure */
324 tr_msg_get_req(mreq)->conn = conn;
325 tr_msg_get_req(mreq)->gssctx = gssctx;
327 /* Allocate a response structure and populate common fields */
328 if (NULL == (resp = tids_create_response (tids, tr_msg_get_req(mreq)))) {
329 fprintf(stderr, "tids_handle_connection: Error creating response structure.\n");
330 /* try to send an error */
331 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error creating response.\n");
335 if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
336 fprintf(stderr, "tids_handle_connection: Error from tids_handle_request(), rc = %d.\n", rc);
337 /* Fall through, to send the response, either way */
340 if (0 > (rc = tids_send_response(tids, tr_msg_get_req(mreq), resp))) {
341 fprintf(stderr, "tids_handle_connection: Error from tids_send_response(), rc = %d.\n", rc);
342 /* if we didn't already send a response, try to send a generic error. */
343 if (!tr_msg_get_req(mreq)->resp_sent)
344 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error sending response.\n");
345 /* Fall through to free the response, either way. */
348 tids_destroy_response(tids, resp);
353 TIDS_INSTANCE *tids_create (void)
355 TIDS_INSTANCE *tids = NULL;
356 if (tids = malloc(sizeof(TIDS_INSTANCE)))
357 memset(tids, 0, sizeof(TIDS_INSTANCE));
361 int tids_start (TIDS_INSTANCE *tids,
362 TIDS_REQ_FUNC *req_handler,
363 tids_auth_func *auth_handler,
364 const char *hostname,
372 if (0 > (listen = tids_listen(tids, port)))
373 perror ("Error from tids_listen()");
375 /* store the caller's request handler & cookie */
376 tids->req_handler = req_handler;
377 tids->auth_handler = auth_handler;
378 tids->hostname = hostname;
379 tids->cookie = cookie;
381 tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
383 while(1) { /* accept incoming conns until we are stopped */
385 if (0 > (conn = accept(listen, NULL, NULL))) {
386 perror("Error from TIDS Server accept()");
390 if (0 > (pid = fork())) {
391 perror("Error on fork()");
397 tids_handle_connection(tids, conn);
404 /* clean up any processes that have completed */
405 while (waitpid(-1, 0, WNOHANG) > 0);
408 return 1; /* should never get here, loops "forever" */
411 void tids_destroy (TIDS_INSTANCE *tids)
413 /* close syslog connection if syslog is enabled */