1 /* $NetBSD: isakmp_ident.c,v 1.6 2006/10/02 21:41:59 manu Exp $ */
2
3 /* Id: isakmp_ident.c,v 1.21 2006/04/06 16:46:08 manubsd Exp */
4
5 /*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /* Identity Protecion Exchange (Main Mode) */
35
36 #include "config.h"
37
38 #include <sys/types.h>
39 #include <sys/param.h>
40
41 #include <stdlib.h>
42 #include <stdio.h>
43 #include <string.h>
44 #include <errno.h>
45 #if TIME_WITH_SYS_TIME
46 # include <sys/time.h>
47 # include <time.h>
48 #else
49 # if HAVE_SYS_TIME_H
50 # include <sys/time.h>
51 # else
52 # include <time.h>
53 # endif
54 #endif
55
56 #include "var.h"
57 #include "misc.h"
58 #include "vmbuf.h"
59 #include "plog.h"
60 #include "sockmisc.h"
61 #include "schedule.h"
62 #include "debug.h"
63
64 #include "localconf.h"
65 #include "remoteconf.h"
66 #include "isakmp_var.h"
67 #include "isakmp.h"
68 #include "evt.h"
69 #include "oakley.h"
70 #include "handler.h"
71 #include "ipsec_doi.h"
72 #include "crypto_openssl.h"
73 #include "pfkey.h"
74 #include "isakmp_ident.h"
75 #include "isakmp_inf.h"
76 #include "vendorid.h"
77
78 #ifdef ENABLE_NATT
79 #include "nattraversal.h"
80 #endif
81 #ifdef HAVE_GSSAPI
82 #include "gssapi.h"
83 #endif
84 #ifdef ENABLE_HYBRID
85 #include <resolv.h>
86 #include "isakmp_xauth.h"
87 #include "isakmp_cfg.h"
88 #endif
89 #ifdef ENABLE_FRAG
90 #include "isakmp_frag.h"
91 #endif
92
93 static vchar_t *ident_ir2mx __P((struct ph1handle *));
94 static vchar_t *ident_ir3mx __P((struct ph1handle *));
95
96 /* %%%
97 * begin Identity Protection Mode as initiator.
98 */
99 /*
100 * send to responder
101 * psk: HDR, SA
102 * sig: HDR, SA
103 * rsa: HDR, SA
104 * rev: HDR, SA
105 */
106 int
ident_i1send(iph1,msg)107 ident_i1send(iph1, msg)
108 struct ph1handle *iph1;
109 vchar_t *msg; /* must be null */
110 {
111 struct payload_list *plist = NULL;
112 int error = -1;
113 #ifdef ENABLE_NATT
114 vchar_t *vid_natt[MAX_NATT_VID_COUNT] = { NULL };
115 int i;
116 #endif
117 #ifdef ENABLE_HYBRID
118 vchar_t *vid_xauth = NULL;
119 vchar_t *vid_unity = NULL;
120 #endif
121 #ifdef ENABLE_FRAG
122 vchar_t *vid_frag = NULL;
123 #endif
124 #ifdef ENABLE_DPD
125 vchar_t *vid_dpd = NULL;
126 #endif
127 /* validity check */
128 if (msg != NULL) {
129 plog(LLV_ERROR, LOCATION, NULL,
130 "msg has to be NULL in this function.\n");
131 goto end;
132 }
133 if (iph1->status != PHASE1ST_START) {
134 plog(LLV_ERROR, LOCATION, NULL,
135 "status mismatched %d.\n", iph1->status);
136 goto end;
137 }
138
139 /* create isakmp index */
140 memset(&iph1->index, 0, sizeof(iph1->index));
141 isakmp_newcookie((caddr_t)&iph1->index, iph1->remote, iph1->local);
142
143 /* create SA payload for my proposal */
144 iph1->sa = ipsecdoi_setph1proposal(iph1->rmconf->proposal);
145 if (iph1->sa == NULL)
146 goto end;
147
148 /* set SA payload to propose */
149 plist = isakmp_plist_append(plist, iph1->sa, ISAKMP_NPTYPE_SA);
150
151 #ifdef ENABLE_NATT
152 /* set VID payload for NAT-T if NAT-T support allowed in the config file */
153 if (iph1->rmconf->nat_traversal)
154 plist = isakmp_plist_append_natt_vids(plist, vid_natt);
155 #endif
156 #ifdef ENABLE_HYBRID
157 /* Do we need Xauth VID? */
158 switch (RMAUTHMETHOD(iph1)) {
159 case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I:
160 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
161 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
162 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I:
163 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I:
164 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
165 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
166 if ((vid_xauth = set_vendorid(VENDORID_XAUTH)) == NULL)
167 plog(LLV_ERROR, LOCATION, NULL,
168 "Xauth vendor ID generation failed\n");
169 else
170 plist = isakmp_plist_append(plist,
171 vid_xauth, ISAKMP_NPTYPE_VID);
172
173 if ((vid_unity = set_vendorid(VENDORID_UNITY)) == NULL)
174 plog(LLV_ERROR, LOCATION, NULL,
175 "Unity vendor ID generation failed\n");
176 else
177 plist = isakmp_plist_append(plist,
178 vid_unity, ISAKMP_NPTYPE_VID);
179 break;
180 default:
181 break;
182 }
183 #endif
184 #ifdef ENABLE_FRAG
185 if (iph1->rmconf->ike_frag) {
186 if ((vid_frag = set_vendorid(VENDORID_FRAG)) == NULL) {
187 plog(LLV_ERROR, LOCATION, NULL,
188 "Frag vendorID construction failed\n");
189 } else {
190 vid_frag = isakmp_frag_addcap(vid_frag,
191 VENDORID_FRAG_IDENT);
192 plist = isakmp_plist_append(plist,
193 vid_frag, ISAKMP_NPTYPE_VID);
194 }
195 }
196 #endif
197 #ifdef ENABLE_DPD
198 if(iph1->rmconf->dpd){
199 vid_dpd = set_vendorid(VENDORID_DPD);
200 if (vid_dpd != NULL)
201 plist = isakmp_plist_append(plist, vid_dpd,
202 ISAKMP_NPTYPE_VID);
203 }
204 #endif
205
206 iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);
207
208 #ifdef HAVE_PRINT_ISAKMP_C
209 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
210 #endif
211
212 /* send the packet, add to the schedule to resend */
213 iph1->retry_counter = iph1->rmconf->retry_counter;
214 if (isakmp_ph1resend(iph1) == -1)
215 goto end;
216
217 iph1->status = PHASE1ST_MSG1SENT;
218
219 error = 0;
220
221 end:
222 #ifdef ENABLE_FRAG
223 if (vid_frag)
224 vfree(vid_frag);
225 #endif
226 #ifdef ENABLE_NATT
227 for (i = 0; i < MAX_NATT_VID_COUNT && vid_natt[i] != NULL; i++)
228 vfree(vid_natt[i]);
229 #endif
230 #ifdef ENABLE_HYBRID
231 if (vid_xauth != NULL)
232 vfree(vid_xauth);
233 if (vid_unity != NULL)
234 vfree(vid_unity);
235 #endif
236 #ifdef ENABLE_DPD
237 if (vid_dpd != NULL)
238 vfree(vid_dpd);
239 #endif
240
241 return error;
242 }
243
244 /*
245 * receive from responder
246 * psk: HDR, SA
247 * sig: HDR, SA
248 * rsa: HDR, SA
249 * rev: HDR, SA
250 */
251 int
ident_i2recv(iph1,msg)252 ident_i2recv(iph1, msg)
253 struct ph1handle *iph1;
254 vchar_t *msg;
255 {
256 vchar_t *pbuf = NULL;
257 struct isakmp_parse_t *pa;
258 vchar_t *satmp = NULL;
259 int error = -1;
260 int vid_numeric;
261
262 /* validity check */
263 if (iph1->status != PHASE1ST_MSG1SENT) {
264 plog(LLV_ERROR, LOCATION, NULL,
265 "status mismatched %d.\n", iph1->status);
266 goto end;
267 }
268
269 /* validate the type of next payload */
270 /*
271 * NOTE: RedCreek(as responder) attaches N[responder-lifetime] here,
272 * if proposal-lifetime > lifetime-redcreek-wants.
273 * (see doi-08 4.5.4)
274 * => According to the seciton 4.6.3 in RFC 2407, This is illegal.
275 * NOTE: we do not really care about ordering of VID and N.
276 * does it matters?
277 * NOTE: even if there's multiple VID/N, we'll ignore them.
278 */
279 pbuf = isakmp_parse(msg);
280 if (pbuf == NULL)
281 goto end;
282 pa = (struct isakmp_parse_t *)pbuf->v;
283
284 /* SA payload is fixed postion */
285 if (pa->type != ISAKMP_NPTYPE_SA) {
286 plog(LLV_ERROR, LOCATION, iph1->remote,
287 "received invalid next payload type %d, "
288 "expecting %d.\n",
289 pa->type, ISAKMP_NPTYPE_SA);
290 goto end;
291 }
292 if (isakmp_p2ph(&satmp, pa->ptr) < 0)
293 goto end;
294 pa++;
295
296 for (/*nothing*/;
297 pa->type != ISAKMP_NPTYPE_NONE;
298 pa++) {
299
300 switch (pa->type) {
301 case ISAKMP_NPTYPE_VID:
302 vid_numeric = check_vendorid(pa->ptr);
303 #ifdef ENABLE_NATT
304 if (iph1->rmconf->nat_traversal && natt_vendorid(vid_numeric))
305 natt_handle_vendorid(iph1, vid_numeric);
306 #endif
307 #ifdef ENABLE_HYBRID
308 switch (vid_numeric) {
309 case VENDORID_XAUTH:
310 iph1->mode_cfg->flags |=
311 ISAKMP_CFG_VENDORID_XAUTH;
312 break;
313
314 case VENDORID_UNITY:
315 iph1->mode_cfg->flags |=
316 ISAKMP_CFG_VENDORID_UNITY;
317 break;
318
319 default:
320 break;
321 }
322 #endif
323 #ifdef ENABLE_DPD
324 if (vid_numeric == VENDORID_DPD && iph1->rmconf->dpd)
325 iph1->dpd_support=1;
326 #endif
327 break;
328 default:
329 /* don't send information, see ident_r1recv() */
330 plog(LLV_ERROR, LOCATION, iph1->remote,
331 "ignore the packet, "
332 "received unexpecting payload type %d.\n",
333 pa->type);
334 goto end;
335 }
336 }
337
338 #ifdef ENABLE_NATT
339 if (NATT_AVAILABLE(iph1))
340 plog(LLV_INFO, LOCATION, iph1->remote,
341 "Selected NAT-T version: %s\n",
342 vid_string_by_id(iph1->natt_options->version));
343 #endif
344
345 /* check SA payload and set approval SA for use */
346 if (ipsecdoi_checkph1proposal(satmp, iph1) < 0) {
347 plog(LLV_ERROR, LOCATION, iph1->remote,
348 "failed to get valid proposal.\n");
349 /* XXX send information */
350 goto end;
351 }
352 VPTRINIT(iph1->sa_ret);
353
354 iph1->status = PHASE1ST_MSG2RECEIVED;
355
356 error = 0;
357
358 end:
359 if (pbuf)
360 vfree(pbuf);
361 if (satmp)
362 vfree(satmp);
363 return error;
364 }
365
366 /*
367 * send to responder
368 * psk: HDR, KE, Ni
369 * sig: HDR, KE, Ni
370 * gssapi: HDR, KE, Ni, GSSi
371 * rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
372 * rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
373 * <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
374 */
375 int
ident_i2send(iph1,msg)376 ident_i2send(iph1, msg)
377 struct ph1handle *iph1;
378 vchar_t *msg;
379 {
380 int error = -1;
381
382 /* validity check */
383 if (iph1->status != PHASE1ST_MSG2RECEIVED) {
384 plog(LLV_ERROR, LOCATION, NULL,
385 "status mismatched %d.\n", iph1->status);
386 goto end;
387 }
388
389 /* fix isakmp index */
390 memcpy(&iph1->index.r_ck, &((struct isakmp *)msg->v)->r_ck,
391 sizeof(cookie_t));
392
393 /* generate DH public value */
394 if (oakley_dh_generate(iph1->approval->dhgrp,
395 &iph1->dhpub, &iph1->dhpriv) < 0)
396 goto end;
397
398 /* generate NONCE value */
399 iph1->nonce = eay_set_random(iph1->rmconf->nonce_size);
400 if (iph1->nonce == NULL)
401 goto end;
402
403 #ifdef HAVE_GSSAPI
404 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
405 gssapi_get_itoken(iph1, NULL) < 0)
406 goto end;
407 #endif
408
409 /* create buffer to send isakmp payload */
410 iph1->sendbuf = ident_ir2mx(iph1);
411 if (iph1->sendbuf == NULL)
412 goto end;
413
414 #ifdef HAVE_PRINT_ISAKMP_C
415 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
416 #endif
417
418 /* send the packet, add to the schedule to resend */
419 iph1->retry_counter = iph1->rmconf->retry_counter;
420 if (isakmp_ph1resend(iph1) == -1)
421 goto end;
422
423 /* the sending message is added to the received-list. */
424 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
425 plog(LLV_ERROR , LOCATION, NULL,
426 "failed to add a response packet to the tree.\n");
427 goto end;
428 }
429
430 iph1->status = PHASE1ST_MSG2SENT;
431
432 error = 0;
433
434 end:
435 return error;
436 }
437
438 /*
439 * receive from responder
440 * psk: HDR, KE, Nr
441 * sig: HDR, KE, Nr [, CR ]
442 * gssapi: HDR, KE, Nr, GSSr
443 * rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
444 * rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
445 */
446 int
ident_i3recv(iph1,msg)447 ident_i3recv(iph1, msg)
448 struct ph1handle *iph1;
449 vchar_t *msg;
450 {
451 vchar_t *pbuf = NULL;
452 struct isakmp_parse_t *pa;
453 int error = -1;
454 #ifdef HAVE_GSSAPI
455 vchar_t *gsstoken = NULL;
456 #endif
457 #ifdef ENABLE_NATT
458 vchar_t *natd_received;
459 int natd_seq = 0, natd_verified;
460 #endif
461
462 /* validity check */
463 if (iph1->status != PHASE1ST_MSG2SENT) {
464 plog(LLV_ERROR, LOCATION, NULL,
465 "status mismatched %d.\n", iph1->status);
466 goto end;
467 }
468
469 /* validate the type of next payload */
470 pbuf = isakmp_parse(msg);
471 if (pbuf == NULL)
472 goto end;
473
474 for (pa = (struct isakmp_parse_t *)pbuf->v;
475 pa->type != ISAKMP_NPTYPE_NONE;
476 pa++) {
477
478 switch (pa->type) {
479 case ISAKMP_NPTYPE_KE:
480 if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
481 goto end;
482 break;
483 case ISAKMP_NPTYPE_NONCE:
484 if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
485 goto end;
486 break;
487 case ISAKMP_NPTYPE_VID:
488 (void)check_vendorid(pa->ptr);
489 break;
490 case ISAKMP_NPTYPE_CR:
491 if (oakley_savecr(iph1, pa->ptr) < 0)
492 goto end;
493 break;
494 #ifdef HAVE_GSSAPI
495 case ISAKMP_NPTYPE_GSS:
496 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
497 goto end;
498 gssapi_save_received_token(iph1, gsstoken);
499 break;
500 #endif
501
502 #ifdef ENABLE_NATT
503 case ISAKMP_NPTYPE_NATD_DRAFT:
504 case ISAKMP_NPTYPE_NATD_RFC:
505 if (NATT_AVAILABLE(iph1) && iph1->natt_options != NULL &&
506 pa->type == iph1->natt_options->payload_nat_d) {
507 natd_received = NULL;
508 if (isakmp_p2ph (&natd_received, pa->ptr) < 0)
509 goto end;
510
511 /* set both bits first so that we can clear them
512 upon verifying hashes */
513 if (natd_seq == 0)
514 iph1->natt_flags |= NAT_DETECTED;
515
516 /* this function will clear appropriate bits bits
517 from iph1->natt_flags */
518 natd_verified = natt_compare_addr_hash (iph1,
519 natd_received, natd_seq++);
520
521 plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
522 natd_seq - 1,
523 natd_verified ? "verified" : "doesn't match");
524
525 vfree (natd_received);
526 break;
527 }
528 /* passthrough to default... */
529 #endif
530
531 default:
532 /* don't send information, see ident_r1recv() */
533 plog(LLV_ERROR, LOCATION, iph1->remote,
534 "ignore the packet, "
535 "received unexpecting payload type %d.\n",
536 pa->type);
537 goto end;
538 }
539 }
540
541 #ifdef ENABLE_NATT
542 if (NATT_AVAILABLE(iph1)) {
543 plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
544 iph1->natt_flags & NAT_DETECTED ?
545 "detected:" : "not detected",
546 iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
547 iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
548 if (iph1->natt_flags & NAT_DETECTED)
549 natt_float_ports (iph1);
550 }
551 #endif
552
553 /* payload existency check */
554 if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
555 plog(LLV_ERROR, LOCATION, iph1->remote,
556 "few isakmp message received.\n");
557 goto end;
558 }
559
560 if (oakley_checkcr(iph1) < 0) {
561 /* Ignore this error in order to be interoperability. */
562 ;
563 }
564
565 iph1->status = PHASE1ST_MSG3RECEIVED;
566
567 error = 0;
568
569 end:
570 #ifdef HAVE_GSSAPI
571 if (gsstoken)
572 vfree(gsstoken);
573 #endif
574 if (pbuf)
575 vfree(pbuf);
576 if (error) {
577 VPTRINIT(iph1->dhpub_p);
578 VPTRINIT(iph1->nonce_p);
579 VPTRINIT(iph1->id_p);
580 oakley_delcert(iph1->cr_p);
581 iph1->cr_p = NULL;
582 }
583
584 return error;
585 }
586
587 /*
588 * send to responder
589 * psk: HDR*, IDi1, HASH_I
590 * sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
591 * gssapi: HDR*, IDi1, < Gssi(n) | HASH_I >
592 * rsa: HDR*, HASH_I
593 * rev: HDR*, HASH_I
594 */
595 int
ident_i3send(iph1,msg0)596 ident_i3send(iph1, msg0)
597 struct ph1handle *iph1;
598 vchar_t *msg0;
599 {
600 int error = -1;
601 int dohash = 1;
602 #ifdef HAVE_GSSAPI
603 int len;
604 #endif
605
606 /* validity check */
607 if (iph1->status != PHASE1ST_MSG3RECEIVED) {
608 plog(LLV_ERROR, LOCATION, NULL,
609 "status mismatched %d.\n", iph1->status);
610 goto end;
611 }
612
613 /* compute sharing secret of DH */
614 if (oakley_dh_compute(iph1->approval->dhgrp, iph1->dhpub,
615 iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
616 goto end;
617
618 /* generate SKEYIDs & IV & final cipher key */
619 if (oakley_skeyid(iph1) < 0)
620 goto end;
621 if (oakley_skeyid_dae(iph1) < 0)
622 goto end;
623 if (oakley_compute_enckey(iph1) < 0)
624 goto end;
625 if (oakley_newiv(iph1) < 0)
626 goto end;
627
628 /* make ID payload into isakmp status */
629 if (ipsecdoi_setid1(iph1) < 0)
630 goto end;
631
632 #ifdef HAVE_GSSAPI
633 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
634 gssapi_more_tokens(iph1)) {
635 plog(LLV_DEBUG, LOCATION, NULL, "calling get_itoken\n");
636 if (gssapi_get_itoken(iph1, &len) < 0)
637 goto end;
638 if (len != 0)
639 dohash = 0;
640 }
641 #endif
642
643 /* generate HASH to send */
644 if (dohash) {
645 iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
646 if (iph1->hash == NULL)
647 goto end;
648 } else
649 iph1->hash = NULL;
650
651 /* set encryption flag */
652 iph1->flags |= ISAKMP_FLAG_E;
653
654 /* create HDR;ID;HASH payload */
655 iph1->sendbuf = ident_ir3mx(iph1);
656 if (iph1->sendbuf == NULL)
657 goto end;
658
659 /* send the packet, add to the schedule to resend */
660 iph1->retry_counter = iph1->rmconf->retry_counter;
661 if (isakmp_ph1resend(iph1) == -1)
662 goto end;
663
664 /* the sending message is added to the received-list. */
665 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg0) == -1) {
666 plog(LLV_ERROR , LOCATION, NULL,
667 "failed to add a response packet to the tree.\n");
668 goto end;
669 }
670
671 /* see handler.h about IV synchronization. */
672 memcpy(iph1->ivm->ive->v, iph1->ivm->iv->v, iph1->ivm->iv->l);
673
674 iph1->status = PHASE1ST_MSG3SENT;
675
676 error = 0;
677
678 end:
679 return error;
680 }
681
682 /*
683 * receive from responder
684 * psk: HDR*, IDr1, HASH_R
685 * sig: HDR*, IDr1, [ CERT, ] SIG_R
686 * gssapi: HDR*, IDr1, < GSSr(n) | HASH_R >
687 * rsa: HDR*, HASH_R
688 * rev: HDR*, HASH_R
689 */
690 int
ident_i4recv(iph1,msg0)691 ident_i4recv(iph1, msg0)
692 struct ph1handle *iph1;
693 vchar_t *msg0;
694 {
695 vchar_t *pbuf = NULL;
696 struct isakmp_parse_t *pa;
697 vchar_t *msg = NULL;
698 int error = -1;
699 int type;
700 #ifdef HAVE_GSSAPI
701 vchar_t *gsstoken = NULL;
702 #endif
703
704 /* validity check */
705 if (iph1->status != PHASE1ST_MSG3SENT) {
706 plog(LLV_ERROR, LOCATION, NULL,
707 "status mismatched %d.\n", iph1->status);
708 goto end;
709 }
710
711 /* decrypting */
712 if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
713 plog(LLV_ERROR, LOCATION, iph1->remote,
714 "ignore the packet, "
715 "expecting the packet encrypted.\n");
716 goto end;
717 }
718 msg = oakley_do_decrypt(iph1, msg0, iph1->ivm->iv, iph1->ivm->ive);
719 if (msg == NULL)
720 goto end;
721
722 /* validate the type of next payload */
723 pbuf = isakmp_parse(msg);
724 if (pbuf == NULL)
725 goto end;
726
727 iph1->pl_hash = NULL;
728
729 for (pa = (struct isakmp_parse_t *)pbuf->v;
730 pa->type != ISAKMP_NPTYPE_NONE;
731 pa++) {
732
733 switch (pa->type) {
734 case ISAKMP_NPTYPE_ID:
735 if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
736 goto end;
737 break;
738 case ISAKMP_NPTYPE_HASH:
739 iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
740 break;
741 case ISAKMP_NPTYPE_CERT:
742 if (oakley_savecert(iph1, pa->ptr) < 0)
743 goto end;
744 break;
745 case ISAKMP_NPTYPE_SIG:
746 if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
747 goto end;
748 break;
749 #ifdef HAVE_GSSAPI
750 case ISAKMP_NPTYPE_GSS:
751 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
752 goto end;
753 gssapi_save_received_token(iph1, gsstoken);
754 break;
755 #endif
756 case ISAKMP_NPTYPE_VID:
757 (void)check_vendorid(pa->ptr);
758 break;
759 case ISAKMP_NPTYPE_N:
760 isakmp_check_notify(pa->ptr, iph1);
761 break;
762 default:
763 /* don't send information, see ident_r1recv() */
764 plog(LLV_ERROR, LOCATION, iph1->remote,
765 "ignore the packet, "
766 "received unexpecting payload type %d.\n",
767 pa->type);
768 goto end;
769 }
770 }
771
772 /* payload existency check */
773
774 /* verify identifier */
775 if (ipsecdoi_checkid1(iph1) != 0) {
776 plog(LLV_ERROR, LOCATION, iph1->remote,
777 "invalid ID payload.\n");
778 goto end;
779 }
780
781 /* validate authentication value */
782 #ifdef HAVE_GSSAPI
783 if (gsstoken == NULL) {
784 #endif
785 type = oakley_validate_auth(iph1);
786 if (type != 0) {
787 if (type == -1) {
788 /* msg printed inner oakley_validate_auth() */
789 goto end;
790 }
791 EVT_PUSH(iph1->local, iph1->remote,
792 EVTT_PEERPH1AUTH_FAILED, NULL);
793 isakmp_info_send_n1(iph1, type, NULL);
794 goto end;
795 }
796 #ifdef HAVE_GSSAPI
797 }
798 #endif
799
800 /*
801 * XXX: Should we do compare two addresses, ph1handle's and ID
802 * payload's.
803 */
804
805 plog(LLV_DEBUG, LOCATION, iph1->remote, "peer's ID:");
806 plogdump(LLV_DEBUG, iph1->id_p->v, iph1->id_p->l);
807
808 /* see handler.h about IV synchronization. */
809 memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->ive->l);
810
811 /*
812 * If we got a GSS token, we need to this roundtrip again.
813 */
814 #ifdef HAVE_GSSAPI
815 iph1->status = gsstoken != 0 ? PHASE1ST_MSG3RECEIVED :
816 PHASE1ST_MSG4RECEIVED;
817 #else
818 iph1->status = PHASE1ST_MSG4RECEIVED;
819 #endif
820
821 error = 0;
822
823 end:
824 if (pbuf)
825 vfree(pbuf);
826 if (msg)
827 vfree(msg);
828 #ifdef HAVE_GSSAPI
829 if (gsstoken)
830 vfree(gsstoken);
831 #endif
832
833 if (error) {
834 VPTRINIT(iph1->id_p);
835 oakley_delcert(iph1->cert_p);
836 iph1->cert_p = NULL;
837 oakley_delcert(iph1->crl_p);
838 iph1->crl_p = NULL;
839 VPTRINIT(iph1->sig_p);
840 }
841
842 return error;
843 }
844
845 /*
846 * status update and establish isakmp sa.
847 */
848 int
ident_i4send(iph1,msg)849 ident_i4send(iph1, msg)
850 struct ph1handle *iph1;
851 vchar_t *msg;
852 {
853 int error = -1;
854
855 /* validity check */
856 if (iph1->status != PHASE1ST_MSG4RECEIVED) {
857 plog(LLV_ERROR, LOCATION, NULL,
858 "status mismatched %d.\n", iph1->status);
859 goto end;
860 }
861
862 /* see handler.h about IV synchronization. */
863 memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->iv->l);
864
865 iph1->status = PHASE1ST_ESTABLISHED;
866
867 error = 0;
868
869 end:
870 return error;
871 }
872
873 /*
874 * receive from initiator
875 * psk: HDR, SA
876 * sig: HDR, SA
877 * rsa: HDR, SA
878 * rev: HDR, SA
879 */
880 int
ident_r1recv(iph1,msg)881 ident_r1recv(iph1, msg)
882 struct ph1handle *iph1;
883 vchar_t *msg;
884 {
885 vchar_t *pbuf = NULL;
886 struct isakmp_parse_t *pa;
887 int error = -1;
888 int vid_numeric;
889
890 /* validity check */
891 if (iph1->status != PHASE1ST_START) {
892 plog(LLV_ERROR, LOCATION, NULL,
893 "status mismatched %d.\n", iph1->status);
894 goto end;
895 }
896
897 /* validate the type of next payload */
898 /*
899 * NOTE: XXX even if multiple VID, we'll silently ignore those.
900 */
901 pbuf = isakmp_parse(msg);
902 if (pbuf == NULL)
903 goto end;
904 pa = (struct isakmp_parse_t *)pbuf->v;
905
906 /* check the position of SA payload */
907 if (pa->type != ISAKMP_NPTYPE_SA) {
908 plog(LLV_ERROR, LOCATION, iph1->remote,
909 "received invalid next payload type %d, "
910 "expecting %d.\n",
911 pa->type, ISAKMP_NPTYPE_SA);
912 goto end;
913 }
914 if (isakmp_p2ph(&iph1->sa, pa->ptr) < 0)
915 goto end;
916 pa++;
917
918 for (/*nothing*/;
919 pa->type != ISAKMP_NPTYPE_NONE;
920 pa++) {
921
922 switch (pa->type) {
923 case ISAKMP_NPTYPE_VID:
924 vid_numeric = check_vendorid(pa->ptr);
925 #ifdef ENABLE_NATT
926 if (iph1->rmconf->nat_traversal && natt_vendorid(vid_numeric))
927 natt_handle_vendorid(iph1, vid_numeric);
928 #endif
929 #ifdef ENABLE_FRAG
930 if ((vid_numeric == VENDORID_FRAG) &&
931 (vendorid_frag_cap(pa->ptr) & VENDORID_FRAG_IDENT))
932 iph1->frag = 1;
933 #endif
934 #ifdef ENABLE_HYBRID
935 switch (vid_numeric) {
936 case VENDORID_XAUTH:
937 iph1->mode_cfg->flags |=
938 ISAKMP_CFG_VENDORID_XAUTH;
939 break;
940
941 case VENDORID_UNITY:
942 iph1->mode_cfg->flags |=
943 ISAKMP_CFG_VENDORID_UNITY;
944 break;
945
946 default:
947 break;
948 }
949 #endif
950 #ifdef ENABLE_DPD
951 if (vid_numeric == VENDORID_DPD && iph1->rmconf->dpd)
952 iph1->dpd_support=1;
953 #endif
954 break;
955 default:
956 /*
957 * We don't send information to the peer even
958 * if we received malformed packet. Because we
959 * can't distinguish the malformed packet and
960 * the re-sent packet. And we do same behavior
961 * when we expect encrypted packet.
962 */
963 plog(LLV_ERROR, LOCATION, iph1->remote,
964 "ignore the packet, "
965 "received unexpecting payload type %d.\n",
966 pa->type);
967 goto end;
968 }
969 }
970
971 #ifdef ENABLE_NATT
972 if (NATT_AVAILABLE(iph1))
973 plog(LLV_INFO, LOCATION, iph1->remote,
974 "Selected NAT-T version: %s\n",
975 vid_string_by_id(iph1->natt_options->version));
976 #endif
977
978 /* check SA payload and set approval SA for use */
979 if (ipsecdoi_checkph1proposal(iph1->sa, iph1) < 0) {
980 plog(LLV_ERROR, LOCATION, iph1->remote,
981 "failed to get valid proposal.\n");
982 /* XXX send information */
983 goto end;
984 }
985
986 iph1->status = PHASE1ST_MSG1RECEIVED;
987
988 error = 0;
989
990 end:
991 if (pbuf)
992 vfree(pbuf);
993 if (error) {
994 VPTRINIT(iph1->sa);
995 }
996
997 return error;
998 }
999
1000 /*
1001 * send to initiator
1002 * psk: HDR, SA
1003 * sig: HDR, SA
1004 * rsa: HDR, SA
1005 * rev: HDR, SA
1006 */
1007 int
ident_r1send(iph1,msg)1008 ident_r1send(iph1, msg)
1009 struct ph1handle *iph1;
1010 vchar_t *msg;
1011 {
1012 struct payload_list *plist = NULL;
1013 int error = -1;
1014 vchar_t *gss_sa = NULL;
1015 #ifdef HAVE_GSSAPI
1016 int free_gss_sa = 0;
1017 #endif
1018 #ifdef ENABLE_NATT
1019 vchar_t *vid_natt = NULL;
1020 #endif
1021 #ifdef ENABLE_HYBRID
1022 vchar_t *vid_xauth = NULL;
1023 vchar_t *vid_unity = NULL;
1024 #endif
1025 #ifdef ENABLE_DPD
1026 vchar_t *vid_dpd = NULL;
1027 #endif
1028 #ifdef ENABLE_FRAG
1029 vchar_t *vid_frag = NULL;
1030 #endif
1031
1032 /* validity check */
1033 if (iph1->status != PHASE1ST_MSG1RECEIVED) {
1034 plog(LLV_ERROR, LOCATION, NULL,
1035 "status mismatched %d.\n", iph1->status);
1036 goto end;
1037 }
1038
1039 /* set responder's cookie */
1040 isakmp_newcookie((caddr_t)&iph1->index.r_ck, iph1->remote, iph1->local);
1041
1042 #ifdef HAVE_GSSAPI
1043 if (iph1->approval->gssid != NULL) {
1044 gss_sa = ipsecdoi_setph1proposal(iph1->approval);
1045 if (gss_sa != iph1->sa_ret)
1046 free_gss_sa = 1;
1047 } else
1048 #endif
1049 gss_sa = iph1->sa_ret;
1050
1051 /* set SA payload to reply */
1052 plist = isakmp_plist_append(plist, gss_sa, ISAKMP_NPTYPE_SA);
1053
1054 #ifdef ENABLE_HYBRID
1055 if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_XAUTH) {
1056 plog (LLV_INFO, LOCATION, NULL, "Adding xauth VID payload.\n");
1057 if ((vid_xauth = set_vendorid(VENDORID_XAUTH)) == NULL) {
1058 plog(LLV_ERROR, LOCATION, NULL,
1059 "Cannot create Xauth vendor ID\n");
1060 goto end;
1061 }
1062 plist = isakmp_plist_append(plist,
1063 vid_xauth, ISAKMP_NPTYPE_VID);
1064 }
1065
1066 if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_UNITY) {
1067 if ((vid_unity = set_vendorid(VENDORID_UNITY)) == NULL) {
1068 plog(LLV_ERROR, LOCATION, NULL,
1069 "Cannot create Unity vendor ID\n");
1070 goto end;
1071 }
1072 plist = isakmp_plist_append(plist,
1073 vid_unity, ISAKMP_NPTYPE_VID);
1074 }
1075 #endif
1076 #ifdef ENABLE_NATT
1077 /* Has the peer announced NAT-T? */
1078 if (NATT_AVAILABLE(iph1))
1079 vid_natt = set_vendorid(iph1->natt_options->version);
1080
1081 if (vid_natt)
1082 plist = isakmp_plist_append(plist, vid_natt, ISAKMP_NPTYPE_VID);
1083 #endif
1084 #ifdef ENABLE_DPD
1085 /* XXX only send DPD VID if remote sent it ? */
1086 if(iph1->rmconf->dpd){
1087 vid_dpd = set_vendorid(VENDORID_DPD);
1088 if (vid_dpd != NULL)
1089 plist = isakmp_plist_append(plist, vid_dpd, ISAKMP_NPTYPE_VID);
1090 }
1091 #endif
1092 #ifdef ENABLE_FRAG
1093 if (iph1->frag) {
1094 vid_frag = set_vendorid(VENDORID_FRAG);
1095 if (vid_frag != NULL)
1096 vid_frag = isakmp_frag_addcap(vid_frag,
1097 VENDORID_FRAG_IDENT);
1098 if (vid_frag == NULL)
1099 plog(LLV_ERROR, LOCATION, NULL,
1100 "Frag vendorID construction failed\n");
1101 else
1102 plist = isakmp_plist_append(plist,
1103 vid_frag, ISAKMP_NPTYPE_VID);
1104 }
1105 #endif
1106
1107 iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);
1108
1109 #ifdef HAVE_PRINT_ISAKMP_C
1110 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
1111 #endif
1112
1113 /* send the packet, add to the schedule to resend */
1114 iph1->retry_counter = iph1->rmconf->retry_counter;
1115 if (isakmp_ph1resend(iph1) == -1) {
1116 goto end;
1117 }
1118
1119 /* the sending message is added to the received-list. */
1120 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
1121 plog(LLV_ERROR , LOCATION, NULL,
1122 "failed to add a response packet to the tree.\n");
1123 goto end;
1124 }
1125
1126 iph1->status = PHASE1ST_MSG1SENT;
1127
1128 error = 0;
1129
1130 end:
1131 #ifdef HAVE_GSSAPI
1132 if (free_gss_sa)
1133 vfree(gss_sa);
1134 #endif
1135 #ifdef ENABLE_NATT
1136 if (vid_natt)
1137 vfree(vid_natt);
1138 #endif
1139 #ifdef ENABLE_HYBRID
1140 if (vid_xauth != NULL)
1141 vfree(vid_xauth);
1142 if (vid_unity != NULL)
1143 vfree(vid_unity);
1144 #endif
1145 #ifdef ENABLE_DPD
1146 if (vid_dpd != NULL)
1147 vfree(vid_dpd);
1148 #endif
1149 #ifdef ENABLE_FRAG
1150 if (vid_frag != NULL)
1151 vfree(vid_frag);
1152 #endif
1153
1154 return error;
1155 }
1156
1157 /*
1158 * receive from initiator
1159 * psk: HDR, KE, Ni
1160 * sig: HDR, KE, Ni
1161 * gssapi: HDR, KE, Ni, GSSi
1162 * rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
1163 * rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
1164 * <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
1165 */
1166 int
ident_r2recv(iph1,msg)1167 ident_r2recv(iph1, msg)
1168 struct ph1handle *iph1;
1169 vchar_t *msg;
1170 {
1171 vchar_t *pbuf = NULL;
1172 struct isakmp_parse_t *pa;
1173 int error = -1;
1174 #ifdef HAVE_GSSAPI
1175 vchar_t *gsstoken = NULL;
1176 #endif
1177 #ifdef ENABLE_NATT
1178 int natd_seq = 0;
1179 #endif
1180
1181 /* validity check */
1182 if (iph1->status != PHASE1ST_MSG1SENT) {
1183 plog(LLV_ERROR, LOCATION, NULL,
1184 "status mismatched %d.\n", iph1->status);
1185 goto end;
1186 }
1187
1188 /* validate the type of next payload */
1189 pbuf = isakmp_parse(msg);
1190 if (pbuf == NULL)
1191 goto end;
1192
1193 for (pa = (struct isakmp_parse_t *)pbuf->v;
1194 pa->type != ISAKMP_NPTYPE_NONE;
1195 pa++) {
1196 switch (pa->type) {
1197 case ISAKMP_NPTYPE_KE:
1198 if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
1199 goto end;
1200 break;
1201 case ISAKMP_NPTYPE_NONCE:
1202 if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
1203 goto end;
1204 break;
1205 case ISAKMP_NPTYPE_VID:
1206 (void)check_vendorid(pa->ptr);
1207 break;
1208 case ISAKMP_NPTYPE_CR:
1209 plog(LLV_WARNING, LOCATION, iph1->remote,
1210 "CR received, ignore it. "
1211 "It should be in other exchange.\n");
1212 break;
1213 #ifdef HAVE_GSSAPI
1214 case ISAKMP_NPTYPE_GSS:
1215 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
1216 goto end;
1217 gssapi_save_received_token(iph1, gsstoken);
1218 break;
1219 #endif
1220
1221 #ifdef ENABLE_NATT
1222 case ISAKMP_NPTYPE_NATD_DRAFT:
1223 case ISAKMP_NPTYPE_NATD_RFC:
1224 if (NATT_AVAILABLE(iph1) && iph1->natt_options != NULL &&
1225 pa->type == iph1->natt_options->payload_nat_d)
1226 {
1227 vchar_t *natd_received = NULL;
1228 int natd_verified;
1229
1230 if (isakmp_p2ph (&natd_received, pa->ptr) < 0)
1231 goto end;
1232
1233 if (natd_seq == 0)
1234 iph1->natt_flags |= NAT_DETECTED;
1235
1236 natd_verified = natt_compare_addr_hash (iph1,
1237 natd_received, natd_seq++);
1238
1239 plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
1240 natd_seq - 1,
1241 natd_verified ? "verified" : "doesn't match");
1242
1243 vfree (natd_received);
1244 break;
1245 }
1246 /* passthrough to default... */
1247 #endif
1248
1249 default:
1250 /* don't send information, see ident_r1recv() */
1251 plog(LLV_ERROR, LOCATION, iph1->remote,
1252 "ignore the packet, "
1253 "received unexpecting payload type %d.\n",
1254 pa->type);
1255 goto end;
1256 }
1257 }
1258
1259 #ifdef ENABLE_NATT
1260 if (NATT_AVAILABLE(iph1))
1261 plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
1262 iph1->natt_flags & NAT_DETECTED ?
1263 "detected:" : "not detected",
1264 iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
1265 iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
1266 #endif
1267
1268 /* payload existency check */
1269 if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
1270 plog(LLV_ERROR, LOCATION, iph1->remote,
1271 "few isakmp message received.\n");
1272 goto end;
1273 }
1274
1275 iph1->status = PHASE1ST_MSG2RECEIVED;
1276
1277 error = 0;
1278
1279 end:
1280 if (pbuf)
1281 vfree(pbuf);
1282 #ifdef HAVE_GSSAPI
1283 if (gsstoken)
1284 vfree(gsstoken);
1285 #endif
1286
1287 if (error) {
1288 VPTRINIT(iph1->dhpub_p);
1289 VPTRINIT(iph1->nonce_p);
1290 VPTRINIT(iph1->id_p);
1291 }
1292
1293 return error;
1294 }
1295
1296 /*
1297 * send to initiator
1298 * psk: HDR, KE, Nr
1299 * sig: HDR, KE, Nr [, CR ]
1300 * gssapi: HDR, KE, Nr, GSSr
1301 * rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
1302 * rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
1303 */
1304 int
ident_r2send(iph1,msg)1305 ident_r2send(iph1, msg)
1306 struct ph1handle *iph1;
1307 vchar_t *msg;
1308 {
1309 int error = -1;
1310
1311 /* validity check */
1312 if (iph1->status != PHASE1ST_MSG2RECEIVED) {
1313 plog(LLV_ERROR, LOCATION, NULL,
1314 "status mismatched %d.\n", iph1->status);
1315 goto end;
1316 }
1317
1318 /* generate DH public value */
1319 if (oakley_dh_generate(iph1->approval->dhgrp,
1320 &iph1->dhpub, &iph1->dhpriv) < 0)
1321 goto end;
1322
1323 /* generate NONCE value */
1324 iph1->nonce = eay_set_random(iph1->rmconf->nonce_size);
1325 if (iph1->nonce == NULL)
1326 goto end;
1327
1328 #ifdef HAVE_GSSAPI
1329 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
1330 gssapi_get_rtoken(iph1, NULL);
1331 #endif
1332
1333 /* create HDR;KE;NONCE payload */
1334 iph1->sendbuf = ident_ir2mx(iph1);
1335 if (iph1->sendbuf == NULL)
1336 goto end;
1337
1338 #ifdef HAVE_PRINT_ISAKMP_C
1339 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
1340 #endif
1341
1342 /* send the packet, add to the schedule to resend */
1343 iph1->retry_counter = iph1->rmconf->retry_counter;
1344 if (isakmp_ph1resend(iph1) == -1)
1345 goto end;
1346
1347 /* the sending message is added to the received-list. */
1348 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
1349 plog(LLV_ERROR , LOCATION, NULL,
1350 "failed to add a response packet to the tree.\n");
1351 goto end;
1352 }
1353
1354 /* compute sharing secret of DH */
1355 if (oakley_dh_compute(iph1->approval->dhgrp, iph1->dhpub,
1356 iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
1357 goto end;
1358
1359 /* generate SKEYIDs & IV & final cipher key */
1360 if (oakley_skeyid(iph1) < 0)
1361 goto end;
1362 if (oakley_skeyid_dae(iph1) < 0)
1363 goto end;
1364 if (oakley_compute_enckey(iph1) < 0)
1365 goto end;
1366 if (oakley_newiv(iph1) < 0)
1367 goto end;
1368
1369 iph1->status = PHASE1ST_MSG2SENT;
1370
1371 error = 0;
1372
1373 end:
1374 return error;
1375 }
1376
1377 /*
1378 * receive from initiator
1379 * psk: HDR*, IDi1, HASH_I
1380 * sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
1381 * gssapi: HDR*, [ IDi1, ] < GSSi(n) | HASH_I >
1382 * rsa: HDR*, HASH_I
1383 * rev: HDR*, HASH_I
1384 */
1385 int
ident_r3recv(iph1,msg0)1386 ident_r3recv(iph1, msg0)
1387 struct ph1handle *iph1;
1388 vchar_t *msg0;
1389 {
1390 vchar_t *msg = NULL;
1391 vchar_t *pbuf = NULL;
1392 struct isakmp_parse_t *pa;
1393 int error = -1;
1394 int type;
1395 #ifdef HAVE_GSSAPI
1396 vchar_t *gsstoken = NULL;
1397 #endif
1398
1399 /* validity check */
1400 if (iph1->status != PHASE1ST_MSG2SENT) {
1401 plog(LLV_ERROR, LOCATION, NULL,
1402 "status mismatched %d.\n", iph1->status);
1403 goto end;
1404 }
1405
1406 /* decrypting */
1407 if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
1408 plog(LLV_ERROR, LOCATION, iph1->remote,
1409 "reject the packet, "
1410 "expecting the packet encrypted.\n");
1411 goto end;
1412 }
1413 msg = oakley_do_decrypt(iph1, msg0, iph1->ivm->iv, iph1->ivm->ive);
1414 if (msg == NULL)
1415 goto end;
1416
1417 /* validate the type of next payload */
1418 pbuf = isakmp_parse(msg);
1419 if (pbuf == NULL)
1420 goto end;
1421
1422 iph1->pl_hash = NULL;
1423
1424 for (pa = (struct isakmp_parse_t *)pbuf->v;
1425 pa->type != ISAKMP_NPTYPE_NONE;
1426 pa++) {
1427
1428 switch (pa->type) {
1429 case ISAKMP_NPTYPE_ID:
1430 if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
1431 goto end;
1432 break;
1433 case ISAKMP_NPTYPE_HASH:
1434 iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
1435 break;
1436 case ISAKMP_NPTYPE_CR:
1437 if (oakley_savecr(iph1, pa->ptr) < 0)
1438 goto end;
1439 break;
1440 case ISAKMP_NPTYPE_CERT:
1441 if (oakley_savecert(iph1, pa->ptr) < 0)
1442 goto end;
1443 break;
1444 case ISAKMP_NPTYPE_SIG:
1445 if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
1446 goto end;
1447 break;
1448 #ifdef HAVE_GSSAPI
1449 case ISAKMP_NPTYPE_GSS:
1450 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
1451 goto end;
1452 gssapi_save_received_token(iph1, gsstoken);
1453 break;
1454 #endif
1455 case ISAKMP_NPTYPE_VID:
1456 (void)check_vendorid(pa->ptr);
1457 break;
1458 case ISAKMP_NPTYPE_N:
1459 isakmp_check_notify(pa->ptr, iph1);
1460 break;
1461 default:
1462 /* don't send information, see ident_r1recv() */
1463 plog(LLV_ERROR, LOCATION, iph1->remote,
1464 "ignore the packet, "
1465 "received unexpecting payload type %d.\n",
1466 pa->type);
1467 goto end;
1468 }
1469 }
1470
1471 /* payload existency check */
1472 /* XXX same as ident_i4recv(), should be merged. */
1473 {
1474 int ng = 0;
1475
1476 switch (AUTHMETHOD(iph1)) {
1477 case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
1478 #ifdef ENABLE_HYBRID
1479 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R:
1480 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R:
1481 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R:
1482 #endif
1483 if (iph1->id_p == NULL || iph1->pl_hash == NULL)
1484 ng++;
1485 break;
1486 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
1487 case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
1488 #ifdef ENABLE_HYBRID
1489 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R:
1490 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R:
1491 #endif
1492 if (iph1->id_p == NULL || iph1->sig_p == NULL)
1493 ng++;
1494 break;
1495 case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
1496 case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
1497 #ifdef ENABLE_HYBRID
1498 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R:
1499 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R:
1500 #endif
1501 if (iph1->pl_hash == NULL)
1502 ng++;
1503 break;
1504 #ifdef HAVE_GSSAPI
1505 case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
1506 if (gsstoken == NULL && iph1->pl_hash == NULL)
1507 ng++;
1508 break;
1509 #endif
1510 default:
1511 plog(LLV_ERROR, LOCATION, iph1->remote,
1512 "invalid authmethod %d why ?\n",
1513 iph1->approval->authmethod);
1514 goto end;
1515 }
1516 if (ng) {
1517 plog(LLV_ERROR, LOCATION, iph1->remote,
1518 "few isakmp message received.\n");
1519 goto end;
1520 }
1521 }
1522
1523 /* verify identifier */
1524 if (ipsecdoi_checkid1(iph1) != 0) {
1525 plog(LLV_ERROR, LOCATION, iph1->remote,
1526 "invalid ID payload.\n");
1527 goto end;
1528 }
1529
1530 /* validate authentication value */
1531 #ifdef HAVE_GSSAPI
1532 if (gsstoken == NULL) {
1533 #endif
1534 type = oakley_validate_auth(iph1);
1535 if (type != 0) {
1536 if (type == -1) {
1537 /* msg printed inner oakley_validate_auth() */
1538 goto end;
1539 }
1540 EVT_PUSH(iph1->local, iph1->remote,
1541 EVTT_PEERPH1AUTH_FAILED, NULL);
1542 isakmp_info_send_n1(iph1, type, NULL);
1543 goto end;
1544 }
1545 #ifdef HAVE_GSSAPI
1546 }
1547 #endif
1548
1549 if (oakley_checkcr(iph1) < 0) {
1550 /* Ignore this error in order to be interoperability. */
1551 ;
1552 }
1553
1554 /*
1555 * XXX: Should we do compare two addresses, ph1handle's and ID
1556 * payload's.
1557 */
1558
1559 plog(LLV_DEBUG, LOCATION, iph1->remote, "peer's ID\n");
1560 plogdump(LLV_DEBUG, iph1->id_p->v, iph1->id_p->l);
1561
1562 /* see handler.h about IV synchronization. */
1563 memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->ive->l);
1564
1565 #ifdef HAVE_GSSAPI
1566 iph1->status = gsstoken != NULL ? PHASE1ST_MSG2RECEIVED :
1567 PHASE1ST_MSG3RECEIVED;
1568 #else
1569 iph1->status = PHASE1ST_MSG3RECEIVED;
1570 #endif
1571
1572 error = 0;
1573
1574 end:
1575 if (pbuf)
1576 vfree(pbuf);
1577 if (msg)
1578 vfree(msg);
1579 #ifdef HAVE_GSSAPI
1580 if (gsstoken)
1581 vfree(gsstoken);
1582 #endif
1583
1584 if (error) {
1585 VPTRINIT(iph1->id_p);
1586 oakley_delcert(iph1->cert_p);
1587 iph1->cert_p = NULL;
1588 oakley_delcert(iph1->crl_p);
1589 iph1->crl_p = NULL;
1590 VPTRINIT(iph1->sig_p);
1591 oakley_delcert(iph1->cr_p);
1592 iph1->cr_p = NULL;
1593 }
1594
1595 return error;
1596 }
1597
1598 /*
1599 * send to initiator
1600 * psk: HDR*, IDr1, HASH_R
1601 * sig: HDR*, IDr1, [ CERT, ] SIG_R
1602 * gssapi: HDR*, IDr1, < GSSr(n) | HASH_R >
1603 * rsa: HDR*, HASH_R
1604 * rev: HDR*, HASH_R
1605 */
1606 int
ident_r3send(iph1,msg)1607 ident_r3send(iph1, msg)
1608 struct ph1handle *iph1;
1609 vchar_t *msg;
1610 {
1611 int error = -1;
1612 int dohash = 1;
1613 #ifdef HAVE_GSSAPI
1614 int len;
1615 #endif
1616
1617 /* validity check */
1618 if (iph1->status != PHASE1ST_MSG3RECEIVED) {
1619 plog(LLV_ERROR, LOCATION, NULL,
1620 "status mismatched %d.\n", iph1->status);
1621 goto end;
1622 }
1623
1624 /* make ID payload into isakmp status */
1625 if (ipsecdoi_setid1(iph1) < 0)
1626 goto end;
1627
1628 #ifdef HAVE_GSSAPI
1629 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
1630 gssapi_more_tokens(iph1)) {
1631 gssapi_get_rtoken(iph1, &len);
1632 if (len != 0)
1633 dohash = 0;
1634 }
1635 #endif
1636
1637 if (dohash) {
1638 /* generate HASH to send */
1639 plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_R\n");
1640 iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
1641 if (iph1->hash == NULL)
1642 goto end;
1643 } else
1644 iph1->hash = NULL;
1645
1646 /* set encryption flag */
1647 iph1->flags |= ISAKMP_FLAG_E;
1648
1649 /* create HDR;ID;HASH payload */
1650 iph1->sendbuf = ident_ir3mx(iph1);
1651 if (iph1->sendbuf == NULL)
1652 goto end;
1653
1654 /* send HDR;ID;HASH to responder */
1655 if (isakmp_send(iph1, iph1->sendbuf) < 0)
1656 goto end;
1657
1658 /* the sending message is added to the received-list. */
1659 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
1660 plog(LLV_ERROR , LOCATION, NULL,
1661 "failed to add a response packet to the tree.\n");
1662 goto end;
1663 }
1664
1665 /* see handler.h about IV synchronization. */
1666 memcpy(iph1->ivm->ive->v, iph1->ivm->iv->v, iph1->ivm->iv->l);
1667
1668 iph1->status = PHASE1ST_ESTABLISHED;
1669
1670 error = 0;
1671
1672 end:
1673
1674 return error;
1675 }
1676
1677 /*
1678 * This is used in main mode for:
1679 * initiator's 3rd exchange send to responder
1680 * psk: HDR, KE, Ni
1681 * sig: HDR, KE, Ni
1682 * rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
1683 * rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
1684 * <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
1685 * responders 2nd exchnage send to initiator
1686 * psk: HDR, KE, Nr
1687 * sig: HDR, KE, Nr [, CR ]
1688 * rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
1689 * rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
1690 */
1691 static vchar_t *
ident_ir2mx(iph1)1692 ident_ir2mx(iph1)
1693 struct ph1handle *iph1;
1694 {
1695 vchar_t *buf = 0;
1696 struct payload_list *plist = NULL;
1697 int need_cr = 0;
1698 vchar_t *cr = NULL;
1699 vchar_t *vid = NULL;
1700 int error = -1;
1701 #ifdef HAVE_GSSAPI
1702 vchar_t *gsstoken = NULL;
1703 #endif
1704 #ifdef ENABLE_NATT
1705 vchar_t *natd[2] = { NULL, NULL };
1706 #endif
1707
1708 /* create CR if need */
1709 if (iph1->side == RESPONDER
1710 && iph1->rmconf->send_cr
1711 && oakley_needcr(iph1->approval->authmethod)
1712 && iph1->rmconf->peerscertfile == NULL) {
1713 need_cr = 1;
1714 cr = oakley_getcr(iph1);
1715 if (cr == NULL) {
1716 plog(LLV_ERROR, LOCATION, NULL,
1717 "failed to get cr buffer.\n");
1718 goto end;
1719 }
1720 }
1721
1722 #ifdef HAVE_GSSAPI
1723 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
1724 gssapi_get_token_to_send(iph1, &gsstoken);
1725 #endif
1726
1727 /* create isakmp KE payload */
1728 plist = isakmp_plist_append(plist, iph1->dhpub, ISAKMP_NPTYPE_KE);
1729
1730 /* create isakmp NONCE payload */
1731 plist = isakmp_plist_append(plist, iph1->nonce, ISAKMP_NPTYPE_NONCE);
1732
1733 #ifdef HAVE_GSSAPI
1734 if (AUTHMETHOD(iph1) == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
1735 plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
1736 #endif
1737
1738 /* append vendor id, if needed */
1739 if (vid)
1740 plist = isakmp_plist_append(plist, vid, ISAKMP_NPTYPE_VID);
1741
1742 /* create isakmp CR payload if needed */
1743 if (need_cr)
1744 plist = isakmp_plist_append(plist, cr, ISAKMP_NPTYPE_CR);
1745
1746 #ifdef ENABLE_NATT
1747 /* generate and append NAT-D payloads */
1748 if (NATT_AVAILABLE(iph1) && iph1->status == PHASE1ST_MSG2RECEIVED)
1749 {
1750 if ((natd[0] = natt_hash_addr (iph1, iph1->remote)) == NULL) {
1751 plog(LLV_ERROR, LOCATION, NULL,
1752 "NAT-D hashing failed for %s\n", saddr2str(iph1->remote));
1753 goto end;
1754 }
1755
1756 if ((natd[1] = natt_hash_addr (iph1, iph1->local)) == NULL) {
1757 plog(LLV_ERROR, LOCATION, NULL,
1758 "NAT-D hashing failed for %s\n", saddr2str(iph1->local));
1759 goto end;
1760 }
1761
1762 plog (LLV_INFO, LOCATION, NULL, "Adding remote and local NAT-D payloads.\n");
1763 plist = isakmp_plist_append(plist, natd[0], iph1->natt_options->payload_nat_d);
1764 plist = isakmp_plist_append(plist, natd[1], iph1->natt_options->payload_nat_d);
1765 }
1766 #endif
1767
1768 buf = isakmp_plist_set_all (&plist, iph1);
1769
1770 error = 0;
1771
1772 end:
1773 if (error && buf != NULL) {
1774 vfree(buf);
1775 buf = NULL;
1776 }
1777 if (cr)
1778 vfree(cr);
1779 #ifdef HAVE_GSSAPI
1780 if (gsstoken)
1781 vfree(gsstoken);
1782 #endif
1783 if (vid)
1784 vfree(vid);
1785
1786 #ifdef ENABLE_NATT
1787 if (natd[0])
1788 vfree(natd[0]);
1789 if (natd[1])
1790 vfree(natd[1]);
1791 #endif
1792
1793 return buf;
1794 }
1795
1796 /*
1797 * This is used in main mode for:
1798 * initiator's 4th exchange send to responder
1799 * psk: HDR*, IDi1, HASH_I
1800 * sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
1801 * gssapi: HDR*, [ IDi1, ] < GSSi(n) | HASH_I >
1802 * rsa: HDR*, HASH_I
1803 * rev: HDR*, HASH_I
1804 * responders 3rd exchnage send to initiator
1805 * psk: HDR*, IDr1, HASH_R
1806 * sig: HDR*, IDr1, [ CERT, ] SIG_R
1807 * gssapi: HDR*, [ IDr1, ] < GSSr(n) | HASH_R >
1808 * rsa: HDR*, HASH_R
1809 * rev: HDR*, HASH_R
1810 */
1811 static vchar_t *
ident_ir3mx(iph1)1812 ident_ir3mx(iph1)
1813 struct ph1handle *iph1;
1814 {
1815 struct payload_list *plist = NULL;
1816 vchar_t *buf = NULL, *new = NULL;
1817 int need_cr = 0;
1818 int need_cert = 0;
1819 vchar_t *cr = NULL;
1820 int error = -1;
1821 #ifdef HAVE_GSSAPI
1822 int nptype;
1823 vchar_t *gsstoken = NULL;
1824 vchar_t *gsshash = NULL;
1825 #endif
1826
1827 switch (AUTHMETHOD(iph1)) {
1828 case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
1829 #ifdef ENABLE_HYBRID
1830 case FICTIVE_AUTH_METHOD_XAUTH_PSKEY_I:
1831 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R:
1832 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
1833 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
1834 #endif
1835 /* create isakmp ID payload */
1836 plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
1837
1838 /* create isakmp HASH payload */
1839 plist = isakmp_plist_append(plist, iph1->hash, ISAKMP_NPTYPE_HASH);
1840 break;
1841 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
1842 case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
1843 #ifdef ENABLE_HYBRID
1844 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R:
1845 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R:
1846 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I:
1847 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R:
1848 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I:
1849 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R:
1850 #endif
1851 if (oakley_getmycert(iph1) < 0)
1852 goto end;
1853
1854 if (oakley_getsign(iph1) < 0)
1855 goto end;
1856
1857 /* create CR if need */
1858 if (iph1->side == INITIATOR
1859 && iph1->rmconf->send_cr
1860 && oakley_needcr(iph1->approval->authmethod)
1861 && iph1->rmconf->peerscertfile == NULL) {
1862 need_cr = 1;
1863 cr = oakley_getcr(iph1);
1864 if (cr == NULL) {
1865 plog(LLV_ERROR, LOCATION, NULL,
1866 "failed to get cr buffer.\n");
1867 goto end;
1868 }
1869 }
1870
1871 if (iph1->cert != NULL && iph1->rmconf->send_cert)
1872 need_cert = 1;
1873
1874 /* add ID payload */
1875 plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
1876
1877 /* add CERT payload if there */
1878 if (need_cert)
1879 plist = isakmp_plist_append(plist, iph1->cert->pl, ISAKMP_NPTYPE_CERT);
1880 /* add SIG payload */
1881 plist = isakmp_plist_append(plist, iph1->sig, ISAKMP_NPTYPE_SIG);
1882
1883 /* create isakmp CR payload */
1884 if (need_cr)
1885 plist = isakmp_plist_append(plist, cr, ISAKMP_NPTYPE_CR);
1886 break;
1887 #ifdef HAVE_GSSAPI
1888 case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
1889 if (iph1->hash != NULL) {
1890 gsshash = gssapi_wraphash(iph1);
1891 if (gsshash == NULL)
1892 goto end;
1893 } else {
1894 gssapi_get_token_to_send(iph1, &gsstoken);
1895 }
1896
1897 if (!gssapi_id_sent(iph1)) {
1898 /* create isakmp ID payload */
1899 plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
1900 gssapi_set_id_sent(iph1);
1901 }
1902
1903 if (iph1->hash != NULL)
1904 /* create isakmp HASH payload */
1905 plist = isakmp_plist_append(plist, gsshash, ISAKMP_NPTYPE_HASH);
1906 else
1907 plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
1908 break;
1909 #endif
1910 case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
1911 case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
1912 #ifdef ENABLE_HYBRID
1913 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
1914 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R:
1915 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
1916 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R:
1917 #endif
1918 plog(LLV_ERROR, LOCATION, NULL,
1919 "not supported authentication type %d\n",
1920 iph1->approval->authmethod);
1921 goto end;
1922 default:
1923 plog(LLV_ERROR, LOCATION, NULL,
1924 "invalid authentication type %d\n",
1925 iph1->approval->authmethod);
1926 goto end;
1927 }
1928
1929 buf = isakmp_plist_set_all (&plist, iph1);
1930
1931 #ifdef HAVE_PRINT_ISAKMP_C
1932 isakmp_printpacket(buf, iph1->local, iph1->remote, 1);
1933 #endif
1934
1935 /* encoding */
1936 new = oakley_do_encrypt(iph1, buf, iph1->ivm->ive, iph1->ivm->iv);
1937 if (new == NULL)
1938 goto end;
1939
1940 vfree(buf);
1941
1942 buf = new;
1943
1944 error = 0;
1945
1946 end:
1947 #ifdef HAVE_GSSAPI
1948 if (gsstoken)
1949 vfree(gsstoken);
1950 #endif
1951 if (cr)
1952 vfree(cr);
1953 if (error && buf != NULL) {
1954 vfree(buf);
1955 buf = NULL;
1956 }
1957
1958 return buf;
1959 }
1960