2 * Copyright (c) 2012, JANET(UK)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of JANET(UK) nor the names of its contributors
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
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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31 * OF THE POSSIBILITY OF SUCH DAMAGE.
41 #include <sys/socket.h>
43 #include <netinet/in.h>
46 #include <tid_internal.h>
50 static TID_RESP *tids_create_response (TIDS_INSTANCE *tids, TID_REQ *req)
54 if ((NULL == (resp = talloc_zero(req, TID_RESP)))) {
55 fprintf(stderr, "tids_create_response: Error allocating response structure.\n");
59 resp->result = TID_SUCCESS; /* presume success */
60 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
61 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
62 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
63 fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
67 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
68 fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
75 static void tids_destroy_response(TIDS_INSTANCE *tids, TID_RESP *resp)
79 tr_free_name(resp->err_msg);
81 tr_free_name(resp->rp_realm);
83 tr_free_name(resp->realm);
85 tr_free_name(resp->comm);
87 tr_free_name(resp->orig_coi);
92 static int tids_listen (TIDS_INSTANCE *tids, int port)
99 struct sockaddr_storage storage;
100 struct sockaddr_in in4;
103 struct sockaddr_in *saddr = (struct sockaddr_in *) &addr.in4;
105 saddr->sin_port = htons (port);
106 saddr->sin_family = AF_INET;
107 saddr->sin_addr.s_addr = INADDR_ANY;
109 if (0 > (conn = socket (AF_INET, SOCK_STREAM, 0)))
112 setsockopt(conn, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
114 if (0 > (rc = bind (conn, (struct sockaddr *) saddr, sizeof(struct sockaddr_in))))
117 if (0 > (rc = listen(conn, 512)))
120 fprintf (stdout, "tids_listen: TID Server listening on port %d\n", port);
124 static int tids_auth_cb(gss_name_t clientName, gss_buffer_t displayName,
127 struct tids_instance *inst = (struct tids_instance *) data;
128 TR_NAME name ={(char *) displayName->value,
129 displayName->length};
130 return inst->auth_handler(clientName, &name, inst->cookie);
133 static int tids_auth_connection (struct tids_instance *inst,
134 int conn, gss_ctx_id_t *gssctx)
137 int auth, autherr = 0;
138 gss_buffer_desc nameBuffer = {0, NULL};
142 nameLen = asprintf(&name, "trustidentity@%s", inst->hostname);
143 nameBuffer.length = nameLen;
144 nameBuffer.value = name;
146 if (rc = gsscon_passive_authenticate(conn, nameBuffer, gssctx, tids_auth_cb, inst)) {
147 fprintf(stderr, "tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.\n", rc);
151 if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
152 fprintf(stderr, "tids_auth_connection: Error from gsscon_authorize, rc = %d, autherr = %d.\n",
158 fprintf(stdout, "tids_auth_connection: Connection authenticated, conn = %d.\n", conn);
160 fprintf(stderr, "tids_auth_connection: Authentication failed, conn %d.\n", conn);
165 static int tids_read_request (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TR_MSG **mreq)
171 if (err = gsscon_read_encrypted_token(conn, *gssctx, &buf, &buflen)) {
177 fprintf(stdout, "tids_read_request():Request Received, %u bytes.\n", (unsigned) buflen);
180 if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
181 fprintf(stderr, "tids_read_request():Error decoding request.\n");
186 /* If this isn't a TID Request, just drop it. */
187 if (TID_REQUEST != (*mreq)->msg_type) {
188 fprintf(stderr, "tids_read_request(): Not a TID Request, dropped.\n");
196 static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
200 /* Check that this is a valid TID Request. If not, send an error return. */
201 if ((!tr_msg_get_req(mreq)) ||
202 (!tr_msg_get_req(mreq)->rp_realm) ||
203 (!tr_msg_get_req(mreq)->realm) ||
204 (!tr_msg_get_req(mreq)->comm)) {
205 fprintf(stderr, "tids_handle_request():Not a valid TID Request.\n");
206 resp->result = TID_ERROR;
207 resp->err_msg = tr_new_name("Bad request format");
211 /* Call the caller's request handler */
212 /* TBD -- Handle different error returns/msgs */
213 if (0 > (rc = (*tids->req_handler)(tids, tr_msg_get_req(mreq), resp, tids->cookie))) {
214 /* set-up an error response */
215 resp->result = TID_ERROR;
216 if (!resp->err_msg) /* Use msg set by handler, if any */
217 resp->err_msg = tr_new_name("Internal processing error");
220 /* set-up a success response */
221 resp->result = TID_SUCCESS;
222 resp->err_msg = NULL; /* No error msg on successful return */
228 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
229 TID_RESP *resp = NULL;
232 /* If we already sent a response, don't send another no matter what. */
236 if (NULL == (resp = tids_create_response(tids, req))) {
237 fprintf(stderr, "tids_send_err_response: Can't create response.\n");
241 /* mark this as an error response, and include the error message */
242 resp->result = TID_ERROR;
243 resp->err_msg = tr_new_name((char *)err_msg);
245 rc = tids_send_response(tids, req, resp);
247 tids_destroy_response(tids, resp);
251 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
257 if ((!tids) || (!req) || (!resp))
258 fprintf (stderr, "tids_send_response: Invalid parameters.\n");
260 /* Never send a second response if we already sent one. */
264 mresp.msg_type = TID_RESPONSE;
265 tr_msg_set_resp(&mresp, resp);
267 if (NULL == (resp_buf = tr_msg_encode(&mresp))) {
268 fprintf(stderr, "tids_send_response: Error encoding json response.\n");
272 fprintf(stderr, "tids_send_response: Encoded response:\n%s\n", resp_buf);
274 /* Send the response over the connection */
275 if (err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
276 strlen(resp_buf) + 1)) {
277 fprintf(stderr, "tids_send_response: Error sending response over connection.\n");
281 /* indicate that a response has been sent for this request */
289 static void tids_handle_connection (TIDS_INSTANCE *tids, int conn)
292 TID_RESP *resp = NULL;
294 gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
296 if (tids_auth_connection(tids, conn, &gssctx)) {
297 fprintf(stderr, "tids_handle_connection: Error authorizing TID Server connection.\n");
302 fprintf(stdout, "tids_handle_connection: Connection authorized!\n");
304 while (1) { /* continue until an error breaks us out */
306 if (0 > (rc = tids_read_request(tids, conn, &gssctx, &mreq))) {
307 fprintf(stderr, "tids_handle_connection: Error from tids_read_request(), rc = %d.\n", rc);
309 } else if (0 == rc) {
313 /* Put connection information into the request structure */
314 tr_msg_get_req(mreq)->conn = conn;
315 tr_msg_get_req(mreq)->gssctx = gssctx;
317 /* Allocate a response structure and populate common fields */
318 if (NULL == (resp = tids_create_response (tids, tr_msg_get_req(mreq)))) {
319 fprintf(stderr, "tids_handle_connection: Error creating response structure.\n");
320 /* try to send an error */
321 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error creating response.\n");
325 if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
326 fprintf(stderr, "tids_handle_connection: Error from tids_handle_request(), rc = %d.\n", rc);
327 /* Fall through, to send the response, either way */
330 if (0 > (rc = tids_send_response(tids, tr_msg_get_req(mreq), resp))) {
331 fprintf(stderr, "tids_handle_connection: Error from tids_send_response(), rc = %d.\n", rc);
332 /* if we didn't already send a response, try to send a generic error. */
333 if (!tr_msg_get_req(mreq)->resp_sent)
334 tids_send_err_response(tids, tr_msg_get_req(mreq), "Error sending response.\n");
335 /* Fall through to free the response, either way. */
338 tids_destroy_response(tids, resp);
343 TIDS_INSTANCE *tids_create (void)
345 TIDS_INSTANCE *tids = NULL;
346 if (tids = malloc(sizeof(TIDS_INSTANCE)))
347 memset(tids, 0, sizeof(TIDS_INSTANCE));
351 int tids_start (TIDS_INSTANCE *tids,
352 TIDS_REQ_FUNC *req_handler,
353 tids_auth_func *auth_handler,
354 const char *hostname,
362 if (0 > (listen = tids_listen(tids, port)))
363 perror ("Error from tids_listen()");
365 /* store the caller's request handler & cookie */
366 tids->req_handler = req_handler;
367 tids->auth_handler = auth_handler;
368 tids->hostname = hostname;
369 tids->cookie = cookie;
371 while(1) { /* accept incoming conns until we are stopped */
373 if (0 > (conn = accept(listen, NULL, NULL))) {
374 perror("Error from TIDS Server accept()");
378 if (0 > (pid = fork())) {
379 perror("Error on fork()");
385 tids_handle_connection(tids, conn);
392 /* clean up any processes that have completed */
393 while (waitpid(-1, 0, WNOHANG) > 0);
396 return 1; /* should never get here, loops "forever" */
399 void tids_destroy (TIDS_INSTANCE *tids)