p_ce.c 36.5 KB
Newer Older
1
2
/*********************************************************************************************************
* Software License Agreement (BSD License)                                                               *
Sebastien Decugis's avatar
Sebastien Decugis committed
3
* Author: Sebastien Decugis <sdecugis@freediameter.net>							 *
4
*													 *
5
* Copyright (c) 2012, WIDE Project and NICT								 *
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
* All rights reserved.											 *
* 													 *
* Redistribution and use of this software in source and binary forms, with or without modification, are  *
* permitted provided that the following conditions are met:						 *
* 													 *
* * Redistributions of source code must retain the above 						 *
*   copyright notice, this list of conditions and the 							 *
*   following disclaimer.										 *
*    													 *
* * Redistributions in binary form must reproduce the above 						 *
*   copyright notice, this list of conditions and the 							 *
*   following disclaimer in the documentation and/or other						 *
*   materials provided with the distribution.								 *
* 													 *
* * Neither the name of the WIDE Project or NICT nor the 						 *
*   names of its contributors may be used to endorse or 						 *
*   promote products derived from this software without 						 *
*   specific prior written permission of WIDE Project and 						 *
*   NICT.												 *
* 													 *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 	 *
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 	 *
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF   *
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.								 *
*********************************************************************************************************/

Sebastien Decugis's avatar
Sebastien Decugis committed
36
#include "fdcore-internal.h"
37

Sebastien Decugis's avatar
Sebastien Decugis committed
38
/* This file contains code to handle Capabilities Exchange messages (CER and CEA) and election process */
39

Sebastien Decugis's avatar
Sebastien Decugis committed
40
41
/* Save a connection as peer's principal */
static int set_peer_cnx(struct fd_peer * peer, struct cnxctx **cnx)
42
{
43
	CHECK_PARAMS( peer->p_cnxctx == NULL );
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
44
	
45
46
47
48
49
50
51
52
53
54
55
56
57
	/* Save the connection in peer */
	peer->p_cnxctx = *cnx;
	*cnx = NULL;
	
	/* Set the events to be sent to the PSM */
	CHECK_FCT( fd_cnx_recv_setaltfifo(peer->p_cnxctx, peer->p_events) );
	
	/* Read the credentials if possible */
	if (fd_cnx_getTLS(peer->p_cnxctx)) {
		CHECK_FCT( fd_cnx_getcred(peer->p_cnxctx, &peer->p_hdr.info.runtime.pir_cert_list, &peer->p_hdr.info.runtime.pir_cert_list_size) );
	}
	
	/* Read the endpoints, maybe used to reconnect to the peer later */
58
	CHECK_FCT( fd_cnx_getremoteeps(peer->p_cnxctx, &peer->p_hdr.info.pi_endpoints) );
59
60
61
62
63
	
	/* Read the protocol */
	peer->p_hdr.info.runtime.pir_proto = fd_cnx_getproto(peer->p_cnxctx);
	
	return 0;
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
64
65
}

66
67
/* Delete the peer connection, and cleanup associated information */
void fd_p_ce_clear_cnx(struct fd_peer * peer, struct cnxctx ** cnx_kept)
Sebastien Decugis's avatar
Sebastien Decugis committed
68
{
69
70
71
	peer->p_hdr.info.runtime.pir_cert_list = NULL;
	peer->p_hdr.info.runtime.pir_cert_list_size = 0;
	peer->p_hdr.info.runtime.pir_proto = 0;
Sebastien Decugis's avatar
Sebastien Decugis committed
72
	
73
74
75
76
77
78
79
80
81
82
	if (peer->p_cnxctx) {
		if (cnx_kept != NULL) {
			*cnx_kept = peer->p_cnxctx;
		} else {
			fd_cnx_destroy(peer->p_cnxctx);
		}
		peer->p_cnxctx = NULL;
	}
}

83
/* Election: compare the Diameter Ids by lexical order, return true if the election is won */
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
static __inline__ int election_result(struct fd_peer * peer)
{
	int ret = (strcasecmp(peer->p_hdr.info.pi_diamid, fd_g_config->cnf_diamid) < 0);
	if (ret) {
		TRACE_DEBUG(INFO, "Election WON against peer '%s'", peer->p_hdr.info.pi_diamid);
	} else {
		TRACE_DEBUG(INFO, "Election LOST against peer '%s'", peer->p_hdr.info.pi_diamid);
	}
	return ret;
}

/* Add AVPs about local information in a CER or CEA */
static int add_CE_info(struct msg *msg, struct cnxctx * cnx, int isi_tls, int isi_none)
{
	struct dict_object * dictobj = NULL;
	struct avp * avp = NULL;
	union avp_value val;
101
	struct fd_list *li;
102
103
104
105
106
107
108
109
	
	/* Add the Origin-* AVPs */
	CHECK_FCT( fd_msg_add_origin ( msg, 1 ) );
	
	/* Find the model for Host-IP-Address AVP */
	CHECK_FCT(  fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Host-IP-Address", &dictobj, ENOENT )  );
		
	/* Add the AVP(s) -- not sure what is the purpose... We could probably only add the primary one ? */
110
	for (li = fd_g_config->cnf_endpoints.next; li != &fd_g_config->cnf_endpoints; li = li->next) {
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
		struct fd_endpoint * ep = (struct fd_endpoint *)li;
		
		CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp ) );
		CHECK_FCT( fd_msg_avp_value_encode ( &ep->ss, avp ) );
		CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
	}
	
	/* Vendor-Id, Product-Name, and Firmware-Revision AVPs */
	CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Vendor-Id", &dictobj, ENOENT )  );
	CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp ) );
	val.u32 = MY_VENDOR_ID;
	CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
	CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
	
	CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Product-Name", &dictobj, ENOENT )  );
	CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp ) );
	val.os.data = (unsigned char *)FD_PROJECT_NAME;
	val.os.len = strlen(FD_PROJECT_NAME);
	CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
	CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
	
	CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Firmware-Revision", &dictobj, ENOENT )  );
	CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp ) );
	val.u32 = (uint32_t)(FD_PROJECT_VERSION_MAJOR * 10000 + FD_PROJECT_VERSION_MINOR * 100 + FD_PROJECT_VERSION_REV);
	CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
	CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
	
	
	/* Add the Inband-Security-Id AVP if needed */
	if (isi_tls || isi_none) {
		CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Inband-Security-Id", &dictobj, ENOENT )  );
		
		if (isi_none) {
			CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp ) );
			val.u32 = ACV_ISI_NO_INBAND_SECURITY;
			CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
			CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
		}
		
		if (isi_tls) {
			CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp ) );
			val.u32 = ACV_ISI_TLS;
			CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
			CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
		}
	}
	
	/* List of local applications */
	{
		struct dict_object * dictobj_auth = NULL;
		struct dict_object * dictobj_acct = NULL;
		struct dict_object * dictobj_vid = NULL;
		
		CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Vendor-Specific-Application-Id", &dictobj, ENOENT )  );
		CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Vendor-Id", &dictobj_vid, ENOENT )  );
		CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Auth-Application-Id", &dictobj_auth, ENOENT )  );
		CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Acct-Application-Id", &dictobj_acct, ENOENT )  );
		
		for (li = fd_g_config->cnf_apps.next; li != &fd_g_config->cnf_apps; li = li->next) {
			struct fd_app * a = (struct fd_app *)(li);

			if (a->flags.auth) {
				CHECK_FCT( fd_msg_avp_new ( dictobj_auth, 0, &avp ) );
				val.u32 = a->appid;
				CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
				if (a->vndid != 0) {
					struct avp * avp2 = NULL;
					CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp2 ) );
					CHECK_FCT( fd_msg_avp_add( avp2, MSG_BRW_LAST_CHILD, avp ) );
					avp = avp2;
					CHECK_FCT( fd_msg_avp_new ( dictobj_vid, 0, &avp2 ) );
					val.u32 = a->vndid;
183
					CHECK_FCT( fd_msg_avp_setvalue( avp2, &val ) );
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
					CHECK_FCT( fd_msg_avp_add( avp, MSG_BRW_LAST_CHILD, avp2 ) );
				}
				CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
			}
			if (a->flags.acct) {
				CHECK_FCT( fd_msg_avp_new ( dictobj_acct, 0, &avp ) );
				val.u32 = a->appid;
				CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
				if (a->vndid != 0) {
					struct avp * avp2 = NULL;
					CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp2 ) );
					CHECK_FCT( fd_msg_avp_add( avp2, MSG_BRW_LAST_CHILD, avp ) );
					avp = avp2;
					CHECK_FCT( fd_msg_avp_new ( dictobj_vid, 0, &avp2 ) );
					val.u32 = a->vndid;
199
					CHECK_FCT( fd_msg_avp_setvalue( avp2, &val ) );
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
					CHECK_FCT( fd_msg_avp_add( avp, MSG_BRW_LAST_CHILD, avp2 ) );
				}
				CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
			}
		}
		
		/* do not forget the relay application */
		if (! fd_g_config->cnf_flags.no_fwd) {
			CHECK_FCT( fd_msg_avp_new ( dictobj_auth, 0, &avp ) );
			val.u32 = AI_RELAY;
			CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
			CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
		}
	}
	
	/* Add the list of supported vendors */
	{
		uint32_t * array = fd_dict_get_vendorid_list(fd_g_config->cnf_dict);
		if (array) {
			int i = 0;
			CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Supported-Vendor-Id", &dictobj, ENOENT )  );
			
			while (array[i] != 0) {
				CHECK_FCT( fd_msg_avp_new ( dictobj, 0, &avp ) );
				val.u32 = array[i];
				CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
				CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
				i++;
			}
			
			free(array);
		}
	}
	
	return 0;
}

/* Remove any information saved from a previous CER/CEA exchange */
static void cleanup_remote_CE_info(struct fd_peer * peer)
{
240
	/* free linked information */
241
242
243
244
245
246
247
	free(peer->p_hdr.info.runtime.pir_realm);
	free(peer->p_hdr.info.runtime.pir_prodname);
	while (!FD_IS_LIST_EMPTY(&peer->p_hdr.info.runtime.pir_apps)) {
		struct fd_list * li = peer->p_hdr.info.runtime.pir_apps.next;
		fd_list_unlink(li);
		free(li);
	}
248
249
250
251
	/* note: pir_cert_list needs not be freed (belongs to gnutls) */
	
	/* cleanup the area */
	memset(&peer->p_hdr.info.runtime, 0, sizeof(peer->p_hdr.info.runtime));
252
	
253
254
255
256
257
	/* reinit the list */
	fd_list_init(&peer->p_hdr.info.runtime.pir_apps, peer);

	/* Remove previously advertised endpoints */
	fd_ep_clearflags( &peer->p_hdr.info.pi_endpoints, EP_FL_ADV );
258
259
260
}

/* Extract information sent by the remote peer and save it in our peer structure */
261
static int save_remote_CE_info(struct msg * msg, struct fd_peer * peer, struct fd_pei * error, uint32_t *rc)
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
{
	struct avp * avp = NULL;
	
	cleanup_remote_CE_info(peer);
	
	CHECK_FCT( fd_msg_browse( msg, MSG_BRW_FIRST_CHILD, &avp, NULL) );
	
	/* Loop on all AVPs and save what we are interrested into */
	while (avp) {
		struct avp_hdr * hdr;

		CHECK_FCT(  fd_msg_avp_hdr( avp, &hdr )  );

		if (hdr->avp_flags & AVP_FLAG_VENDOR) {
			/* Ignore all vendor-specific AVPs in CER/CEA because we don't support any currently */
			TRACE_DEBUG(FULL, "Ignored a vendor AVP in CER / CEA");
			fd_msg_dump_one(FULL, avp);
			goto next;
		}

		switch (hdr->avp_code) {
283
284
285
286
287
288
289
290
291
			case AC_RESULT_CODE: /* Result-Code */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
292
293
				if (rc)
					*rc = hdr->avp_value->u32;
294
295
				break;
		
296
297
298
299
300
301
302
303
304
305
			case AC_ORIGIN_HOST: /* Origin-Host */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				/* We check that the value matches what we know, otherwise disconnect the peer */
306
307
				if (fd_os_almostcasesrch(hdr->avp_value->os.data, hdr->avp_value->os.len, 
							peer->p_hdr.info.pi_diamid, peer->p_hdr.info.pi_diamidlen, NULL)) {
308
309
					TRACE_DEBUG(INFO, "Received a message with Origin-Host set to '%.*s' while expecting '%s'\n", 
							hdr->avp_value->os.len, hdr->avp_value->os.data, peer->p_hdr.info.pi_diamid);
310
					error->pei_errcode = "DIAMETER_AVP_NOT_ALLOWED";
311
312
					error->pei_message = "Your Origin-Host value does not match my configuration.";
					error->pei_avp = avp;
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
					return EINVAL;
				}

				break;
		
			case AC_ORIGIN_REALM: /* Origin-Realm */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				/* In case of multiple AVPs */
				if (peer->p_hdr.info.runtime.pir_realm) {
329
					TRACE_DEBUG(INFO, "Multiple instances of the Origin-Realm AVP");
330
					error->pei_errcode = "DIAMETER_AVP_OCCURS_TOO_MANY_TIMES";
331
332
333
					error->pei_message = "I found several Origin-Realm AVPs";
					error->pei_avp = avp;
					return EINVAL;
334
335
				}
				
336
337
				/* If the octet string contains a \0 */
				if (!fd_os_is_valid_DiameterIdentity(hdr->avp_value->os.data, hdr->avp_value->os.len)) {
338
					error->pei_errcode = "DIAMETER_INVALID_AVP_VALUE";
339
340
341
342
343
344
345
346
					error->pei_message = "Your Origin-Realm contains invalid characters.";
					error->pei_avp = avp;
					return EINVAL;
				}
				
				/* Save the value */
				CHECK_MALLOC(  peer->p_hdr.info.runtime.pir_realm = os0dup( hdr->avp_value->os.data, hdr->avp_value->os.len )  );
				peer->p_hdr.info.runtime.pir_realmlen = hdr->avp_value->os.len;
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
				break;

			case AC_HOST_IP_ADDRESS: /* Host-IP-Address */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				{
					sSS	ss;

					/* Get the sockaddr value */
					memset(&ss, 0, sizeof(ss));
362
363
364
					CHECK_FCT_DO( fd_msg_avp_value_interpret( avp, &ss),
						{
							/* in case of error, assume the AVP value was wrong */
365
							error->pei_errcode = "DIAMETER_INVALID_AVP_VALUE";
366
367
368
							error->pei_avp = avp;
							return EINVAL;
						} );
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385

					/* Save this endpoint in the list as advertized */
					CHECK_FCT( fd_ep_add_merge( &peer->p_hdr.info.pi_endpoints, (sSA *)&ss, sizeof(sSS), EP_FL_ADV ) );
				}
				break;

			case AC_VENDOR_ID: /* Vendor-Id */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				/* In case of multiple AVPs */
				if (peer->p_hdr.info.runtime.pir_vendorid) {
386
					TRACE_DEBUG(INFO, "Multiple instances of the Vendor-Id AVP");
387
					error->pei_errcode = "DIAMETER_AVP_OCCURS_TOO_MANY_TIMES";
388
389
390
					error->pei_message = "I found several Vendor-Id AVPs";
					error->pei_avp = avp;
					return EINVAL;
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
				}
				
				peer->p_hdr.info.runtime.pir_vendorid = hdr->avp_value->u32;
				break;

			case AC_PRODUCT_NAME: /* Product-Name */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				/* In case of multiple AVPs */
				if (peer->p_hdr.info.runtime.pir_prodname) {
407
					TRACE_DEBUG(INFO, "Multiple instances of the Product-Name AVP");
408
					error->pei_errcode = "DIAMETER_AVP_OCCURS_TOO_MANY_TIMES";
409
410
411
					error->pei_message = "I found several Product-Name AVPs";
					error->pei_avp = avp;
					return EINVAL;
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
				}

				CHECK_MALLOC( peer->p_hdr.info.runtime.pir_prodname = calloc( hdr->avp_value->os.len + 1, 1 )  );
				memcpy(peer->p_hdr.info.runtime.pir_prodname, hdr->avp_value->os.data, hdr->avp_value->os.len);
				break;

			case AC_ORIGIN_STATE_ID: /* Origin-State-Id */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				/* In case of multiple AVPs */
				if (peer->p_hdr.info.runtime.pir_orstate) {
429
					TRACE_DEBUG(INFO, "Multiple instances of the Origin-State-Id AVP");
430
					error->pei_errcode = "DIAMETER_AVP_OCCURS_TOO_MANY_TIMES";
431
432
433
					error->pei_message = "I found several Origin-State-Id AVPs";
					error->pei_avp = avp;
					return EINVAL;
434
435
436
437
438
439
440
441
442
443
444
445
446
447
				}
				
				peer->p_hdr.info.runtime.pir_orstate = hdr->avp_value->u32;
				break;

			case AC_SUPPORTED_VENDOR_ID: /* Supported-Vendor-Id */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
448
449
450
451
				TRACE_DEBUG(FULL, "'%s' claims support for a subset of vendor %d features.", peer->p_hdr.info.pi_diamid, hdr->avp_value->u32);
				/* not that it makes a difference for us... 
				 -- if an application actually needs this info, we could save it somewhere.
				*/
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
				break;

			case AC_VENDOR_SPECIFIC_APPLICATION_ID: /* Vendor-Specific-Application-Id (grouped)*/
				{
					struct avp * inavp = NULL;
					application_id_t aid = 0;
					vendor_id_t vid = 0;
					int auth = 0;
					int acct = 0;

					/* get the first child AVP */
					CHECK_FCT(  fd_msg_browse(avp, MSG_BRW_FIRST_CHILD, &inavp, NULL)  );

					while (inavp) {
						struct avp_hdr * inhdr;
						CHECK_FCT(  fd_msg_avp_hdr( inavp, &inhdr )  );

						if (inhdr->avp_flags & AVP_FLAG_VENDOR) {
							TRACE_DEBUG(FULL, "Ignored a vendor AVP inside Vendor-Specific-Application-Id AVP");
							fd_msg_dump_one(FULL, avp);
							goto innext;
						}

						if (inhdr->avp_value == NULL) {
							/* This is a sanity check */
							TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
							fd_msg_dump_one(NONE, avp);
							ASSERT(0); /* To check if this really happens, and understand why... */
							goto innext;
						}
						switch (inhdr->avp_code) {
							case AC_VENDOR_ID: /* Vendor-Id */
								vid = inhdr->avp_value->u32;
								break;
							case AC_AUTH_APPLICATION_ID: /* Auth-Application-Id */
								aid = inhdr->avp_value->u32;
								auth += 1;
								break;
							case AC_ACCT_APPLICATION_ID: /* Acct-Application-Id */
								aid = inhdr->avp_value->u32;
								acct += 1;
								break;
							/* ignore other AVPs */
						}

					innext:			
						/* Go to next in AVP */
						CHECK_FCT( fd_msg_browse(inavp, MSG_BRW_NEXT, &inavp, NULL) );
					}
					
					if (auth + acct != 1) {
						TRACE_DEBUG(FULL, "Invalid Vendor-Specific-Application-Id AVP received, ignored");
						fd_msg_dump_one(FULL, avp);
505
						error->pei_errcode = "DIAMETER_INVALID_AVP_VALUE";
506
507
						error->pei_avp = avp;
						return EINVAL;
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
					} else {
						/* Add an entry in the list */
						CHECK_FCT( fd_app_merge(&peer->p_hdr.info.runtime.pir_apps, aid, vid, auth, acct) );
					}
				}
				break;

			case AC_AUTH_APPLICATION_ID: /* Auth-Application-Id */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				if (hdr->avp_value->u32 == AI_RELAY) {
					peer->p_hdr.info.runtime.pir_relay = 1;
				} else {
					CHECK_FCT( fd_app_merge(&peer->p_hdr.info.runtime.pir_apps, hdr->avp_value->u32, 0, 1, 0) );
				}
				break;

			case AC_ACCT_APPLICATION_ID: /* Acct-Application-Id */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				if (hdr->avp_value->u32 == AI_RELAY) {
541
					/* Not clear if the relay application can be inside this AVP... */
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
					peer->p_hdr.info.runtime.pir_relay = 1;
				} else {
					CHECK_FCT( fd_app_merge(&peer->p_hdr.info.runtime.pir_apps, hdr->avp_value->u32, 0, 0, 1) );
				}
				break;

			case AC_FIRMWARE_REVISION: /* Firmware-Revision */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
				
				peer->p_hdr.info.runtime.pir_firmrev = hdr->avp_value->u32;
				break;

			case AC_INBAND_SECURITY_ID: /* Inband-Security-Id */
				if (hdr->avp_value == NULL) {
					/* This is a sanity check */
					TRACE_DEBUG(NONE, "Ignored an AVP with unset value in CER/CEA");
					fd_msg_dump_one(NONE, avp);
					ASSERT(0); /* To check if this really happens, and understand why... */
					goto next;
				}
568
				if (hdr->avp_value->u32 >= 32 ) {
569
					error->pei_errcode = "DIAMETER_INVALID_AVP_VALUE";
570
571
572
573
					error->pei_message = "I don't support this Inband-Security-Id value (yet).";
					error->pei_avp = avp;
					return EINVAL;
				}
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
				peer->p_hdr.info.runtime.pir_isi |= (1 << hdr->avp_value->u32);
				break;
		}

next:			
		/* Go to next AVP */
		CHECK_FCT( fd_msg_browse(avp, MSG_BRW_NEXT, &avp, NULL) );
	}
	
	return 0;
}

/* Create a CER message for sending */ 
static int create_CER(struct fd_peer * peer, struct cnxctx * cnx, struct msg ** cer)
{
	int isi_tls = 0;
	int isi_none = 0;
Sebastien Decugis's avatar
Sebastien Decugis committed
591
	
592
	/* Find CER dictionary object and create an instance */
Sebastien Decugis's avatar
Sebastien Decugis committed
593
	CHECK_FCT( fd_msg_new ( fd_dict_cmd_CER, MSGFL_ALLOC_ETEID, cer ) );
594
	
595
	/* Do we need Inband-Security-Id AVPs ? If we're already using TLS, we don't... */
596
	if (!fd_cnx_getTLS(cnx)) {
597
		isi_none = peer->p_hdr.info.config.pic_flags.sec & PI_SEC_NONE; /* we add it even if the peer does not use the old mechanism, it is impossible to distinguish */
598
599
		isi_tls  = peer->p_hdr.info.config.pic_flags.sec & PI_SEC_TLS_OLD;
	}
Sebastien Decugis's avatar
Sebastien Decugis committed
600
	
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
	/* Add the information about the local peer */
	CHECK_FCT( add_CE_info(*cer, cnx, isi_tls, isi_none) );
	
	/* Done! */
	return 0;
}


/* Continue with the initiator side */
static int to_waitcea(struct fd_peer * peer, struct cnxctx * cnx)
{
	/* We sent a CER on the connection, set the event queue so that we receive the CEA */
	CHECK_FCT( set_peer_cnx(peer, &cnx) );
	
	/* Change state and reset the timer */
	CHECK_FCT( fd_psm_change_state(peer, STATE_WAITCEA) );
	fd_psm_next_timeout(peer, 0, CEA_TIMEOUT);
	
	return 0;
}

/* Reject an incoming connection attempt */
623
static void receiver_reject(struct cnxctx ** recv_cnx, struct msg ** cer, struct fd_pei * error)
624
625
626
{
	/* Create and send the CEA with appropriate error code */
	CHECK_FCT_DO( fd_msg_new_answer_from_req ( fd_g_config->cnf_dict, cer, MSGFL_ANSW_ERROR ), goto destroy );
627
628
	CHECK_FCT_DO( fd_msg_rescode_set(*cer, error->pei_errcode, error->pei_message, error->pei_avp, 1 ), goto destroy );
	CHECK_FCT_DO( fd_out_send(cer, *recv_cnx, NULL, FD_CNX_ORDERED), goto destroy );
629
630
631
	
	/* And now destroy this connection */
destroy:
632
633
	fd_cnx_destroy(*recv_cnx);
	*recv_cnx = NULL;
634
	if (*cer) {
635
		fd_msg_log(FD_MSG_LOG_DROPPED, *cer, "An error occurred while rejecting a CER.");
636
637
638
639
640
641
642
643
644
645
646
647
		fd_msg_free(*cer);
		*cer = NULL;
	}
}

/* We have established a new connection to the remote peer, send CER and eventually process the election */
int fd_p_ce_handle_newcnx(struct fd_peer * peer, struct cnxctx * initiator)
{
	struct msg * cer = NULL;
	
	/* Send CER on the new connection */
	CHECK_FCT( create_CER(peer, initiator, &cer) );
648
	CHECK_FCT( fd_out_send(&cer, initiator, peer, FD_CNX_ORDERED) );
649
650
	
	/* Are we doing an election ? */
651
	if (fd_peer_getstate(peer) == STATE_WAITCNXACK_ELEC) {
652
653
654
655
656
657
658
659
		if (election_result(peer)) {
			/* Close initiator connection */
			fd_cnx_destroy(initiator);

			/* Process with the receiver side */
			CHECK_FCT( fd_p_ce_process_receiver(peer) );

		} else {
660
661
662
			struct fd_pei pei;
			memset(&pei, 0, sizeof(pei));
			pei.pei_errcode = "ELECTION_LOST";
663
664

			/* Answer an ELECTION LOST to the receiver side */
665
			receiver_reject(&peer->p_receiver, &peer->p_cer, &pei);
666
667
668
669
670
671
			CHECK_FCT( to_waitcea(peer, initiator) );
		}
	} else {
		/* No election (yet) */
		CHECK_FCT( to_waitcea(peer, initiator) );
	}
Sebastien Decugis's avatar
Sebastien Decugis committed
672
	
673
	return 0;
Sebastien Decugis's avatar
Sebastien Decugis committed
674
675
676
677
678
}

/* We have received a Capabilities Exchange message on the peer connection */
int fd_p_ce_msgrcv(struct msg ** msg, int req, struct fd_peer * peer)
{
679
	uint32_t rc = 0;
680
681
682
	int st;
	struct fd_pei pei;
	
Sebastien Decugis's avatar
Sebastien Decugis committed
683
684
685
	TRACE_ENTRY("%p %p", msg, peer);
	CHECK_PARAMS( msg && *msg && CHECK_PEER(peer) );
	
686
	/* The only valid situation where we are called is in WAITCEA and we receive a CEA (we may have won an election) */
Sebastien Decugis's avatar
Sebastien Decugis committed
687
688
689
690
691
692
693
694
695
	
	/* Note : to implement Capabilities Update, we would need to change here */
	
	/* If it is a CER, just reply an error */
	if (req) {
		/* Create the error message */
		CHECK_FCT( fd_msg_new_answer_from_req ( fd_g_config->cnf_dict, msg, MSGFL_ANSW_ERROR ) );
		
		/* Set the error code */
696
		CHECK_FCT( fd_msg_rescode_set(*msg, "DIAMETER_UNABLE_TO_COMPLY", "No CER allowed in current state", NULL, 1 ) );
Sebastien Decugis's avatar
Sebastien Decugis committed
697
698

		/* msg now contains an answer message to send back */
699
		CHECK_FCT_DO( fd_out_send(msg, NULL, peer, FD_CNX_ORDERED), /* In case of error the message has already been dumped */ );
Sebastien Decugis's avatar
Sebastien Decugis committed
700
701
702
	}
	
	/* If the state is not WAITCEA, just discard the message */
703
	if (req || ((st = fd_peer_getstate(peer)) != STATE_WAITCEA)) {
Sebastien Decugis's avatar
Sebastien Decugis committed
704
		if (*msg) {
705
			fd_msg_log( FD_MSG_LOG_DROPPED, *msg, "Received CER/CEA while in '%s' state.\n", STATE_STR(st));
Sebastien Decugis's avatar
Sebastien Decugis committed
706
707
708
709
710
711
712
			CHECK_FCT_DO( fd_msg_free(*msg), /* continue */);
			*msg = NULL;
		}
		
		return 0;
	}
	
713
714
	memset(&pei, 0, sizeof(pei));
	
715
	/* Save info from the CEA into the peer */
716
	CHECK_FCT_DO( save_remote_CE_info(*msg, peer, &pei, &rc), goto cleanup );
717
	
Sebastien Decugis's avatar
Sebastien Decugis committed
718
	/* Dispose of the message, we don't need it anymore */
Sebastien Decugis's avatar
Sebastien Decugis committed
719
	CHECK_FCT_DO( fd_msg_free(*msg), /* continue */ );
Sebastien Decugis's avatar
Sebastien Decugis committed
720
721
	*msg = NULL;
	
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
	/* Check the Result-Code */
	switch (rc) {
		case ER_DIAMETER_SUCCESS:
			/* No problem, we can continue */
			break;
			
		case ER_DIAMETER_TOO_BUSY:
			/* Retry later */
			TRACE_DEBUG(INFO, "Peer %s replied a CEA with Result-Code AVP DIAMETER_TOO_BUSY, will retry later.", peer->p_hdr.info.pi_diamid);
			fd_psm_cleanup(peer, 0);
			fd_psm_next_timeout(peer, 0, 300);
			return 0;
		
		case ER_ELECTION_LOST:
			/* Ok, just wait for a little while for the CER to be processed on the other connection. */
			TRACE_DEBUG(FULL, "Peer %s replied a CEA with Result-Code AVP ELECTION_LOST, waiting for events.", peer->p_hdr.info.pi_diamid);
			return 0;
		
		default:
			/* In any other case, we abort all attempts to connect to this peer */
742
			TRACE_DEBUG(INFO, "Peer %s replied a CEA with Result-Code %d, aborting connection attempts.", peer->p_hdr.info.pi_diamid, rc);
743
744
745
			return EINVAL;
	}
	
746
747
748
	/* Handshake if needed, start clear otherwise */
	if ( ! fd_cnx_getTLS(peer->p_cnxctx) ) {
		int todo = peer->p_hdr.info.config.pic_flags.sec & peer->p_hdr.info.runtime.pir_isi ;
749
750
751
		/* Special case: if the peer did not send a ISI AVP */
		if (peer->p_hdr.info.runtime.pir_isi == 0)
			todo = peer->p_hdr.info.config.pic_flags.sec;
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
		
		if (todo == PI_SEC_NONE) {
			/* Ok for clear connection */
			TRACE_DEBUG(INFO, "No TLS protection negotiated with peer '%s'.", peer->p_hdr.info.pi_diamid);
			CHECK_FCT( fd_cnx_start_clear(peer->p_cnxctx, 1) );
		} else {
			
			fd_psm_change_state(peer, STATE_OPEN_HANDSHAKE);
			CHECK_FCT_DO( fd_cnx_handshake(peer->p_cnxctx, GNUTLS_CLIENT, peer->p_hdr.info.config.pic_priority, NULL),
				{
					/* Handshake failed ...  */
					fd_log_debug("TLS Handshake failed with peer '%s', resetting the connection\n", peer->p_hdr.info.pi_diamid);
					goto cleanup;
				} );

			/* Retrieve the credentials */
			CHECK_FCT( fd_cnx_getcred(peer->p_cnxctx, &peer->p_hdr.info.runtime.pir_cert_list, &peer->p_hdr.info.runtime.pir_cert_list_size) );
		}
	}
	
	/* Move to next state */
	if (peer->p_flags.pf_cnx_pb) {
		fd_psm_change_state(peer, STATE_REOPEN );
		CHECK_FCT( fd_p_dw_reopen(peer) );
	} else {
		fd_psm_change_state(peer, STATE_OPEN );
		fd_psm_next_timeout(peer, 1, peer->p_hdr.info.config.pic_twtimer ?: fd_g_config->cnf_timer_tw);
	}
	
	return 0;
	
cleanup:
	fd_p_ce_clear_cnx(peer, NULL);

	/* Send the error to the peer */
	CHECK_FCT( fd_event_send(peer->p_events, FDEVP_CNX_ERROR, 0, NULL) );

	return 0;
}

792
/* Handle the receiver side to go to OPEN or OPEN_NEW state (any election is resolved) */
793
794
int fd_p_ce_process_receiver(struct fd_peer * peer)
{
795
	struct fd_pei pei;
796
797
	struct msg * msg = NULL;
	int isi = 0;
798
	int fatal = 0;
799
	int tls_sync=0;
800
801
802
803
804
805
806
	
	TRACE_ENTRY("%p", peer);
	
	CHECK_FCT( set_peer_cnx(peer, &peer->p_receiver) );
	msg = peer->p_cer;
	peer->p_cer = NULL;
	
807
808
	memset(&pei, 0, sizeof(pei));
	
809
	/* Parse the content of the received CER */
810
811
812
813
814
	CHECK_FCT_DO( save_remote_CE_info(msg, peer, &pei, NULL), goto error_abort );
	
	/* Validate the realm if needed */
	if (peer->p_hdr.info.config.pic_realm) {
		size_t len = strlen(peer->p_hdr.info.config.pic_realm);
815
		if (fd_os_almostcasesrch(peer->p_hdr.info.config.pic_realm, len, peer->p_hdr.info.runtime.pir_realm, peer->p_hdr.info.runtime.pir_realmlen, NULL)) {
816
817
818
819
820
			TRACE_DEBUG(INFO, "Rejected CER from peer '%s', realm mismatch with configured value (returning DIAMETER_UNKNOWN_PEER).\n", peer->p_hdr.info.pi_diamid);
			pei.pei_errcode = "DIAMETER_UNKNOWN_PEER"; /* maybe AVP_NOT_ALLOWED would be better fit? */
			goto error_abort;
		}
	}
821
	
822
823
824
825
826
	/* Save the credentials if handshake already occurred */
	if ( fd_cnx_getTLS(peer->p_cnxctx) ) {
		CHECK_FCT( fd_cnx_getcred(peer->p_cnxctx, &peer->p_hdr.info.runtime.pir_cert_list, &peer->p_hdr.info.runtime.pir_cert_list_size) );
	}
	
827
828
829
830
	/* Validate the peer if needed */
	if (peer->p_flags.pf_responder) {
		int res = fd_peer_validate( peer );
		if (res < 0) {
831
			TRACE_DEBUG(INFO, "Rejected CER from peer '%s', validation failed (returning DIAMETER_UNKNOWN_PEER).\n", peer->p_hdr.info.pi_diamid);
832
			pei.pei_errcode = "DIAMETER_UNKNOWN_PEER";
833
834
835
836
837
			goto error_abort;
		}
		CHECK_FCT( res );
	}
	
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
838
	/* Check if we have common applications */
839
840
841
842
843
	if ( fd_g_config->cnf_flags.no_fwd && (! peer->p_hdr.info.runtime.pir_relay) ) {
		int got_common;
		CHECK_FCT( fd_app_check_common( &fd_g_config->cnf_apps, &peer->p_hdr.info.runtime.pir_apps, &got_common) );
		if (!got_common) {
			TRACE_DEBUG(INFO, "No common application with peer '%s', sending DIAMETER_NO_COMMON_APPLICATION", peer->p_hdr.info.pi_diamid);
844
			pei.pei_errcode = "DIAMETER_NO_COMMON_APPLICATION";
845
846
847
848
			fatal = 1;
			goto error_abort;
		}
	}
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
849
	
850
	/* Do we agree on ISI ? */
851
	if ( ! fd_cnx_getTLS(peer->p_cnxctx) ) {
852
		
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
		/* In case of responder, the validate callback must have set the config.pic_flags.sec value already */
	
		/* First case: we are not using old mechanism: ISI are deprecated, we ignore it. */
		if ( ! (peer->p_hdr.info.config.pic_flags.sec & PI_SEC_TLS_OLD)) {
			/* Just check then that the peer configuration allows for IPsec protection */
			if (peer->p_hdr.info.config.pic_flags.sec & PI_SEC_NONE) {
				isi = PI_SEC_NONE;
			} else {
				/* otherwise, we should have already been protected. Reject */
				TRACE_DEBUG(INFO, "Non TLS-protected CER/CEA exchanges are not allowed with this peer, rejecting.");
			}
		} else {
			/* The old mechanism is allowed with this peer. Now, look into the ISI AVP values */
			
			/* In case no ISI was present anyway: */
			if (!peer->p_hdr.info.runtime.pir_isi) {
				TRACE_DEBUG(INFO, "Inband-Security-Id AVP is missing in received CER.");
				if (peer->p_hdr.info.config.pic_flags.sec & PI_SEC_NONE) {
					isi = PI_SEC_NONE;
					TRACE_DEBUG(INFO, "IPsec protection allowed by configuration, allowing this mechanism to be used.");
				} else {
					/* otherwise, we should have already been protected. Reject */
					TRACE_DEBUG(INFO, "Rejecting the peer connection (please allow IPsec here or configure TLS in the remote peer).");
				}
			} else {
				/* OK, the remote peer did send the ISI AVP. */
				if ((peer->p_hdr.info.config.pic_flags.sec & PI_SEC_NONE) && (peer->p_hdr.info.runtime.pir_isi & PI_SEC_NONE)) {
					/* We have allowed IPsec */
					isi = PI_SEC_NONE;
				} else if (peer->p_hdr.info.runtime.pir_isi & PI_SEC_TLS_OLD) {
					/* We can agree on TLS */
					isi = PI_SEC_TLS_OLD;
				} else {
					TRACE_DEBUG(INFO, "Remote peer requested IPsec protection, but local configuration forbids it.");
				}
			}
889
		}
890
	
891
892
893
		/* If we did not find an agreement */
		if (!isi) {
			TRACE_DEBUG(INFO, "No common security mechanism with '%s', sending DIAMETER_NO_COMMON_SECURITY", peer->p_hdr.info.pi_diamid);
894
			pei.pei_errcode = "DIAMETER_NO_COMMON_SECURITY";
895
896
897
			fatal = 1;
			goto error_abort;
		}
898
899
900
901
		
		/* Do not send the ISI IPsec if we are using the new mechanism */
		if ((isi == PI_SEC_NONE) && (! (peer->p_hdr.info.config.pic_flags.sec & PI_SEC_TLS_OLD)))
			isi = 0;
902
903
904
905
	}
	
	/* Reply a CEA */
	CHECK_FCT( fd_msg_new_answer_from_req ( fd_g_config->cnf_dict, &msg, 0 ) );
906
	CHECK_FCT( fd_msg_rescode_set(msg, "DIAMETER_SUCCESS", NULL, NULL, 0 ) );
907
	CHECK_FCT( add_CE_info(msg, peer->p_cnxctx, isi & PI_SEC_TLS_OLD, isi & PI_SEC_NONE) );
908
	CHECK_FCT( fd_out_send(&msg, peer->p_cnxctx, peer, FD_CNX_ORDERED ) );
Sebastien Decugis's avatar
Sebastien Decugis committed
909
	
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
	/* Handshake if needed */
	if (isi & PI_SEC_TLS_OLD) {
		fd_psm_change_state(peer, STATE_OPEN_HANDSHAKE);
		CHECK_FCT_DO( fd_cnx_handshake(peer->p_cnxctx, GNUTLS_SERVER, peer->p_hdr.info.config.pic_priority, NULL),
			{
				/* Handshake failed ...  */
				fd_log_debug("TLS Handshake failed with peer '%s', resetting the connection\n", peer->p_hdr.info.pi_diamid);
				goto cleanup;
			} );
		
		/* Retrieve the credentials */
		CHECK_FCT( fd_cnx_getcred(peer->p_cnxctx, &peer->p_hdr.info.runtime.pir_cert_list, &peer->p_hdr.info.runtime.pir_cert_list_size) );
		
		/* Call second validation callback if needed */
		if (peer->p_cb2) {
			TRACE_DEBUG(FULL, "Calling second validation callback for %s", peer->p_hdr.info.pi_diamid);
			CHECK_FCT_DO( (*peer->p_cb2)( &peer->p_hdr.info ),
				{
					TRACE_DEBUG(INFO, "Validation callback rejected the peer %s after handshake", peer->p_hdr.info.pi_diamid);
Sebastien Decugis's avatar
Sebastien Decugis committed
929
					CHECK_FCT( fd_psm_terminate( peer, "DO_NOT_WANT_TO_TALK_TO_YOU" ) );
930
931
932
					return 0;
				}  );
		}
933
		tls_sync = 1;
934
935
936
937
938
939
940
941
942
943
944
945
	} else {
		if ( ! fd_cnx_getTLS(peer->p_cnxctx) ) {
			TRACE_DEBUG(INFO, "No TLS protection negotiated with peer '%s'.", peer->p_hdr.info.pi_diamid);
			CHECK_FCT( fd_cnx_start_clear(peer->p_cnxctx, 1) );
		}
	}
		
	/* Move to OPEN or REOPEN state */
	if (peer->p_flags.pf_cnx_pb) {
		fd_psm_change_state(peer, STATE_REOPEN );
		CHECK_FCT( fd_p_dw_reopen(peer) );
	} else {
946
947
948
949
950
951
952
953
954
		if ((!tls_sync) && (fd_cnx_isMultichan(peer->p_cnxctx))) {
			fd_psm_change_state(peer, STATE_OPEN_NEW );
			/* send DWR */
			CHECK_FCT( fd_p_dw_timeout(peer) );
		} else {

			fd_psm_change_state(peer, STATE_OPEN );
			fd_psm_next_timeout(peer, 1, peer->p_hdr.info.config.pic_twtimer ?: fd_g_config->cnf_timer_tw);
		}
955
956
957
958
959
	}
	
	return 0;

error_abort:
960
961
962
	if (pei.pei_errcode) {
		/* Send the error */
		receiver_reject(&peer->p_cnxctx, &msg, &pei);
963
964
965
966
	}
	
cleanup:
	if (msg) {
967
		fd_msg_log(FD_MSG_LOG_DROPPED, msg, "An error occurred while processing a CER.");
968
969
970
971
972
		fd_msg_free(msg);
	}
	fd_p_ce_clear_cnx(peer, NULL);

	/* Send the error to the peer */
973
	CHECK_FCT( fd_event_send(peer->p_events, fatal ? FDEVP_TERMINATE : FDEVP_CNX_ERROR, 0, NULL) );
974
975

	return 0;
Sebastien Decugis's avatar
Sebastien Decugis committed
976
977
978
}

/* We have received a CER on a new connection for this peer */
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
979
980
int fd_p_ce_handle_newCER(struct msg ** msg, struct fd_peer * peer, struct cnxctx ** cnx, int valid)
{
981
982
983
984
985
	struct fd_pei pei;
	int cur_state = fd_peer_getstate(peer);
	memset(&pei, 0, sizeof(pei));
	
	switch (cur_state) {
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
986
		case STATE_CLOSED:
987
988
989
990
991
			peer->p_receiver = *cnx;
			*cnx = NULL;
			peer->p_cer = *msg;
			*msg = NULL;
			CHECK_FCT( fd_p_ce_process_receiver(peer) );
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
992
993
994
			break;

		case STATE_WAITCNXACK:
995
996
997
998
999
1000
			/* Save the parameters in the peer, move to STATE_WAITCNXACK_ELEC */
			peer->p_receiver = *cnx;
			*cnx = NULL;
			peer->p_cer = *msg;
			*msg = NULL;
			CHECK_FCT( fd_psm_change_state(peer, STATE_WAITCNXACK_ELEC) );
Sebastien Decugis's avatar
Sebastien Decugis committed
1001
1002
			break;
			
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
1003
		case STATE_WAITCEA:
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
			if (election_result(peer)) {
				
				/* Close initiator connection (was already set as principal) */
				fd_p_ce_clear_cnx(peer, NULL);
				
				/* and go on with the receiver side */
				peer->p_receiver = *cnx;
				*cnx = NULL;
				peer->p_cer = *msg;
				*msg = NULL;
				CHECK_FCT( fd_p_ce_process_receiver(peer) );

			} else {

				/* Answer an ELECTION LOST to the receiver side and continue */
1019
1020
1021
				pei.pei_errcode = "ELECTION_LOST";
				pei.pei_message = "Please answer my CER instead, you won the election.";
				receiver_reject(cnx, msg, &pei);
1022
			}
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
1023
1024
1025
			break;

		default:
1026
1027
1028
			pei.pei_errcode = "DIAMETER_UNABLE_TO_COMPLY"; /* INVALID COMMAND? in case of Capabilities-Updates? */
			pei.pei_message = "Invalid state to receive a new connection attempt.";
			receiver_reject(cnx, msg, &pei);
Sebastien Decugis's avatar
Backup    
Sebastien Decugis committed
1029
1030
	}
				
1031
	return 0;
Sebastien Decugis's avatar
Sebastien Decugis committed
1032
}