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
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10 * notice, this list of conditions and the following disclaimer.
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14 * documentation and/or other materials provided with the distribution.
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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
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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41 #include <sys/socket.h>
42 #include <netinet/in.h>
45 #include <tid_internal.h>
49 static TID_RESP *tids_create_response (TIDS_INSTANCE *tids, TID_REQ *req)
53 if ((NULL == (resp = talloc_zero(req, TID_RESP)))) {
54 fprintf(stderr, "tids_create_response: Error allocating response structure.\n");
58 resp->result = TID_SUCCESS; /* presume success */
59 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
60 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
61 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
62 fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
66 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
67 fprintf(stderr, "tids_create_response: Error allocating fields in response.\n");
74 static void tids_destroy_response(TIDS_INSTANCE *tids, TID_RESP *resp)
78 tr_free_name(resp->err_msg);
80 tr_free_name(resp->rp_realm);
82 tr_free_name(resp->realm);
84 tr_free_name(resp->comm);
86 tr_free_name(resp->orig_coi);
91 static int tids_listen (TIDS_INSTANCE *tids, int port)
98 struct sockaddr_storage storage;
99 struct sockaddr_in in4;
102 struct sockaddr_in *saddr = (struct sockaddr_in *) &addr.in4;
104 saddr->sin_port = htons (port);
105 saddr->sin_family = AF_INET;
106 saddr->sin_addr.s_addr = INADDR_ANY;
108 if (0 > (conn = socket (AF_INET, SOCK_STREAM, 0)))
111 setsockopt(conn, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
113 if (0 > (rc = bind (conn, (struct sockaddr *) saddr, sizeof(struct sockaddr_in))))
116 if (0 > (rc = listen(conn, 512)))
119 fprintf (stdout, "tids_listen: TID Server listening on port %d\n", port);
123 static int tids_auth_cb(gss_name_t clientName, gss_buffer_t displayName,
126 struct tids_instance *inst = (struct tids_instance *) data;
127 TR_NAME name ={(char *) displayName->value,
128 displayName->length};
129 return inst->auth_handler(clientName, &name, inst->cookie);
132 static int tids_auth_connection (struct tids_instance *inst,
133 int conn, gss_ctx_id_t *gssctx)
136 int auth, autherr = 0;
137 gss_buffer_desc nameBuffer = {0, NULL};
141 nameLen = asprintf(&name, "trustidentity@%s", inst->hostname);
142 nameBuffer.length = nameLen;
143 nameBuffer.value = name;
145 if (rc = gsscon_passive_authenticate(conn, nameBuffer, gssctx, tids_auth_cb, inst)) {
146 fprintf(stderr, "tids_auth_connection: Error from gsscon_passive_authenticate(), rc = %d.\n", rc);
150 if (rc = gsscon_authorize(*gssctx, &auth, &autherr)) {
151 fprintf(stderr, "tids_auth_connection: Error from gsscon_authorize, rc = %d, autherr = %d.\n",
157 fprintf(stdout, "tids_auth_connection: Connection authenticated, conn = %d.\n", conn);
159 fprintf(stderr, "tids_auth_connection: Authentication failed, conn %d.\n", conn);
164 static int tids_read_request (TIDS_INSTANCE *tids, int conn, gss_ctx_id_t *gssctx, TR_MSG **mreq)
170 if (err = gsscon_read_encrypted_token(conn, *gssctx, &buf, &buflen)) {
176 fprintf(stdout, "tids_read_request():Request Received, %u bytes.\n", (unsigned) buflen);
179 if (NULL == ((*mreq) = tr_msg_decode(buf, buflen))) {
180 fprintf(stderr, "tids_read_request():Error decoding request.\n");
185 /* If this isn't a TID Request, just drop it. */
186 if (TID_REQUEST != (*mreq)->msg_type) {
187 fprintf(stderr, "tids_read_request(): Not a TID Request, dropped.\n");
195 static int tids_handle_request (TIDS_INSTANCE *tids, TR_MSG *mreq, TID_RESP *resp)
199 /* Check that this is a valid TID Request. If not, send an error return. */
200 if ((!mreq->tid_req) ||
201 (!mreq->tid_req->rp_realm) ||
202 (!mreq->tid_req->realm) ||
203 (!mreq->tid_req->comm)) {
204 fprintf(stderr, "tids_handle_request():Not a valid TID Request.\n");
205 resp->result = TID_ERROR;
206 resp->err_msg = tr_new_name("Bad request format");
210 /* Call the caller's request handler */
211 /* TBD -- Handle different error returns/msgs */
212 if (0 > (rc = (*tids->req_handler)(tids, mreq->tid_req, resp, tids->cookie))) {
213 /* set-up an error response */
214 resp->result = TID_ERROR;
215 if (!resp->err_msg) /* Use msg set by handler, if any */
216 resp->err_msg = tr_new_name("Internal processing error");
219 /* set-up a success response */
220 resp->result = TID_SUCCESS;
221 resp->err_msg = NULL; /* No error msg on successful return */
227 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
228 TID_RESP *resp = NULL;
231 /* If we already sent a response, don't send another no matter what. */
235 if (NULL == (resp = tids_create_response(tids, req))) {
236 fprintf(stderr, "tids_send_err_response: Can't create response.\n");
240 /* mark this as an error response, and include the error message */
241 resp->result = TID_ERROR;
242 resp->err_msg = tr_new_name((char *)err_msg);
244 rc = tids_send_response(tids, req, resp);
246 tids_destroy_response(tids, resp);
250 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
256 if ((!tids) || (!req) || (!resp))
257 fprintf (stderr, "tids_send_response: Invalid parameters.\n");
259 /* Never send a second response if we already sent one. */
263 mresp.msg_type = TID_RESPONSE;
264 mresp.tid_resp = resp;
266 if (NULL == (resp_buf = tr_msg_encode(&mresp))) {
267 fprintf(stderr, "tids_send_response: Error encoding json response.\n");
271 fprintf(stderr, "tids_send_response: Encoded response:\n%s\n", resp_buf);
273 /* Send the response over the connection */
274 if (err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
275 strlen(resp_buf) + 1)) {
276 fprintf(stderr, "tids_send_response: Error sending response over connection.\n");
280 /* indicate that a response has been sent for this request */
288 static void tids_handle_connection (TIDS_INSTANCE *tids, int conn)
291 TID_RESP *resp = NULL;
293 gss_ctx_id_t gssctx = GSS_C_NO_CONTEXT;
295 if (tids_auth_connection(tids, conn, &gssctx)) {
296 fprintf(stderr, "tids_handle_connection: Error authorizing TID Server connection.\n");
301 fprintf(stdout, "tids_handle_connection: Connection authorized!\n");
303 while (1) { /* continue until an error breaks us out */
305 if (0 > (rc = tids_read_request(tids, conn, &gssctx, &mreq))) {
306 fprintf(stderr, "tids_handle_connection: Error from tids_read_request(), rc = %d.\n", rc);
308 } else if (0 == rc) {
312 /* Put connection information into the request structure */
313 mreq->tid_req->conn = conn;
314 mreq->tid_req->gssctx = gssctx;
316 /* Allocate a response structure and populate common fields */
317 if (NULL == (resp = tids_create_response (tids, mreq->tid_req))) {
318 fprintf(stderr, "tids_handle_connection: Error creating response structure.\n");
319 /* try to send an error */
320 tids_send_err_response(tids, mreq->tid_req, "Error creating response.\n");
324 if (0 > (rc = tids_handle_request(tids, mreq, resp))) {
325 fprintf(stderr, "tids_handle_connection: Error from tids_handle_request(), rc = %d.\n", rc);
326 /* Fall through, to send the response, either way */
329 if (0 > (rc = tids_send_response(tids, mreq->tid_req, resp))) {
330 fprintf(stderr, "tids_handle_connection: Error from tids_send_response(), rc = %d.\n", rc);
331 /* if we didn't already send a response, try to send a generic error. */
332 if (!mreq->tid_req->resp_sent)
333 tids_send_err_response(tids, mreq->tid_req, "Error sending response.\n");
334 /* Fall through to free the response, either way. */
337 tids_destroy_response(tids, resp);
342 TIDS_INSTANCE *tids_create (void)
344 TIDS_INSTANCE *tids = NULL;
345 if (tids = malloc(sizeof(TIDS_INSTANCE)))
346 memset(tids, 0, sizeof(TIDS_INSTANCE));
350 int tids_start (TIDS_INSTANCE *tids,
351 TIDS_REQ_FUNC *req_handler,
352 tids_auth_func *auth_handler,
353 const char *hostname,
361 if (0 > (listen = tids_listen(tids, port)))
362 perror ("Error from tids_listen()");
364 /* store the caller's request handler & cookie */
365 tids->req_handler = req_handler;
366 tids->auth_handler = auth_handler;
367 tids->hostname = hostname;
368 tids->cookie = cookie;
370 while(1) { /* accept incoming conns until we are stopped */
372 if (0 > (conn = accept(listen, NULL, NULL))) {
373 perror("Error from TIDS Server accept()");
377 if (0 > (pid = fork())) {
378 perror("Error on fork()");
384 tids_handle_connection(tids, conn);
392 return 1; /* should never get here */
395 void tids_destroy (TIDS_INSTANCE *tids)