1 /* $NetBSD: isakmp_ident.c,v 1.16 2018/05/19 19:23:15 maxv 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 static int ident_recv_n __P((struct ph1handle *, struct isakmp_gen *));
96
97 /* %%%
98 * begin Identity Protection Mode as initiator.
99 */
100 /*
101 * send to responder
102 * psk: HDR, SA
103 * sig: HDR, SA
104 * rsa: HDR, SA
105 * rev: HDR, SA
106 */
107 int
ident_i1send(iph1,msg)108 ident_i1send(iph1, msg)
109 struct ph1handle *iph1;
110 vchar_t *msg; /* must be null */
111 {
112 struct payload_list *plist = NULL;
113 int error = -1;
114 #ifdef ENABLE_NATT
115 vchar_t *vid_natt[MAX_NATT_VID_COUNT] = { NULL };
116 int i;
117 #endif
118 #ifdef ENABLE_HYBRID
119 vchar_t *vid_xauth = NULL;
120 vchar_t *vid_unity = NULL;
121 #endif
122 #ifdef ENABLE_FRAG
123 vchar_t *vid_frag = NULL;
124 #endif
125 #ifdef ENABLE_DPD
126 vchar_t *vid_dpd = NULL;
127 #endif
128 /* validity check */
129 if (msg != NULL) {
130 plog(LLV_ERROR, LOCATION, NULL,
131 "msg has to be NULL in this function.\n");
132 goto end;
133 }
134 if (iph1->status != PHASE1ST_START) {
135 plog(LLV_ERROR, LOCATION, NULL,
136 "status mismatched %d.\n", iph1->status);
137 goto end;
138 }
139
140 /* create isakmp index */
141 memset(&iph1->index, 0, sizeof(iph1->index));
142 isakmp_newcookie((caddr_t)&iph1->index, iph1->remote, iph1->local);
143
144 /* create SA payload for my proposal */
145 iph1->sa = ipsecdoi_setph1proposal(iph1->rmconf,
146 iph1->rmconf->proposal);
147 if (iph1->sa == NULL)
148 goto end;
149
150 /* set SA payload to propose */
151 plist = isakmp_plist_append(plist, iph1->sa, ISAKMP_NPTYPE_SA);
152
153 #ifdef ENABLE_NATT
154 /* set VID payload for NAT-T if NAT-T support allowed in the config file */
155 if (iph1->rmconf->nat_traversal)
156 plist = isakmp_plist_append_natt_vids(plist, vid_natt);
157 #endif
158 #ifdef ENABLE_HYBRID
159 /* Do we need Xauth VID? */
160 switch (iph1->rmconf->proposal->authmethod) {
161 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_I:
162 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
163 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
164 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I:
165 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I:
166 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
167 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
168 if ((vid_xauth = set_vendorid(VENDORID_XAUTH)) == NULL)
169 plog(LLV_ERROR, LOCATION, NULL,
170 "Xauth vendor ID generation failed\n");
171 else
172 plist = isakmp_plist_append(plist,
173 vid_xauth, ISAKMP_NPTYPE_VID);
174 /*FALLTHROUGH*/
175 case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
176 if ((vid_unity = set_vendorid(VENDORID_UNITY)) == NULL)
177 plog(LLV_ERROR, LOCATION, NULL,
178 "Unity vendor ID generation failed\n");
179 else
180 plist = isakmp_plist_append(plist,
181 vid_unity, ISAKMP_NPTYPE_VID);
182 break;
183 default:
184 break;
185 }
186 #endif
187 #ifdef ENABLE_FRAG
188 if (iph1->rmconf->ike_frag) {
189 if ((vid_frag = set_vendorid(VENDORID_FRAG)) == NULL) {
190 plog(LLV_ERROR, LOCATION, NULL,
191 "Frag vendorID construction failed\n");
192 } else {
193 vid_frag = isakmp_frag_addcap(vid_frag,
194 VENDORID_FRAG_IDENT);
195 plist = isakmp_plist_append(plist,
196 vid_frag, ISAKMP_NPTYPE_VID);
197 }
198 }
199 #endif
200 #ifdef ENABLE_DPD
201 if(iph1->rmconf->dpd){
202 vid_dpd = set_vendorid(VENDORID_DPD);
203 if (vid_dpd != NULL)
204 plist = isakmp_plist_append(plist, vid_dpd,
205 ISAKMP_NPTYPE_VID);
206 }
207 #endif
208
209 iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);
210
211 #ifdef HAVE_PRINT_ISAKMP_C
212 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
213 #endif
214
215 /* send the packet, add to the schedule to resend */
216 if (isakmp_ph1send(iph1) == -1)
217 goto end;
218
219 iph1->status = PHASE1ST_MSG1SENT;
220
221 error = 0;
222
223 end:
224 #ifdef ENABLE_FRAG
225 if (vid_frag)
226 vfree(vid_frag);
227 #endif
228 #ifdef ENABLE_NATT
229 for (i = 0; i < MAX_NATT_VID_COUNT && vid_natt[i] != NULL; i++)
230 vfree(vid_natt[i]);
231 #endif
232 #ifdef ENABLE_HYBRID
233 if (vid_xauth != NULL)
234 vfree(vid_xauth);
235 if (vid_unity != NULL)
236 vfree(vid_unity);
237 #endif
238 #ifdef ENABLE_DPD
239 if (vid_dpd != NULL)
240 vfree(vid_dpd);
241 #endif
242
243 return error;
244 }
245
246 /*
247 * receive from responder
248 * psk: HDR, SA
249 * sig: HDR, SA
250 * rsa: HDR, SA
251 * rev: HDR, SA
252 */
253 int
ident_i2recv(iph1,msg)254 ident_i2recv(iph1, msg)
255 struct ph1handle *iph1;
256 vchar_t *msg;
257 {
258 vchar_t *pbuf = NULL;
259 struct isakmp_parse_t *pa;
260 vchar_t *satmp = NULL;
261 int error = -1;
262
263 /* validity check */
264 if (iph1->status != PHASE1ST_MSG1SENT) {
265 plog(LLV_ERROR, LOCATION, NULL,
266 "status mismatched %d.\n", iph1->status);
267 goto end;
268 }
269
270 /* validate the type of next payload */
271 /*
272 * NOTE: RedCreek(as responder) attaches N[responder-lifetime] here,
273 * if proposal-lifetime > lifetime-redcreek-wants.
274 * (see doi-08 4.5.4)
275 * => According to the seciton 4.6.3 in RFC 2407, This is illegal.
276 * NOTE: we do not really care about ordering of VID and N.
277 * does it matters?
278 * NOTE: even if there's multiple VID/N, we'll ignore them.
279 */
280 pbuf = isakmp_parse(msg);
281 if (pbuf == NULL)
282 goto end;
283 pa = (struct isakmp_parse_t *)pbuf->v;
284
285 /* SA payload is fixed postion */
286 if (pa->type != ISAKMP_NPTYPE_SA) {
287 plog(LLV_ERROR, LOCATION, iph1->remote,
288 "received invalid next payload type %d, "
289 "expecting %d.\n",
290 pa->type, ISAKMP_NPTYPE_SA);
291 goto end;
292 }
293 if (isakmp_p2ph(&satmp, pa->ptr) < 0)
294 goto end;
295 pa++;
296
297 for (/*nothing*/;
298 pa->type != ISAKMP_NPTYPE_NONE;
299 pa++) {
300
301 switch (pa->type) {
302 case ISAKMP_NPTYPE_VID:
303 handle_vendorid(iph1, pa->ptr);
304 break;
305 default:
306 /* don't send information, see ident_r1recv() */
307 plog(LLV_ERROR, LOCATION, iph1->remote,
308 "ignore the packet, "
309 "received unexpecting payload type %d.\n",
310 pa->type);
311 goto end;
312 }
313 }
314
315 #ifdef ENABLE_NATT
316 if (NATT_AVAILABLE(iph1))
317 plog(LLV_INFO, LOCATION, iph1->remote,
318 "Selected NAT-T version: %s\n",
319 vid_string_by_id(iph1->natt_options->version));
320 #endif
321
322 /* check SA payload and set approval SA for use */
323 if (ipsecdoi_checkph1proposal(satmp, iph1) < 0) {
324 plog(LLV_ERROR, LOCATION, iph1->remote,
325 "failed to get valid proposal.\n");
326 /* XXX send information */
327 goto end;
328 }
329 VPTRINIT(iph1->sa_ret);
330
331 iph1->status = PHASE1ST_MSG2RECEIVED;
332
333 error = 0;
334
335 end:
336 if (pbuf)
337 vfree(pbuf);
338 if (satmp)
339 vfree(satmp);
340 return error;
341 }
342
343 /*
344 * send to responder
345 * psk: HDR, KE, Ni
346 * sig: HDR, KE, Ni
347 * gssapi: HDR, KE, Ni, GSSi
348 * rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
349 * rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
350 * <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
351 */
352 int
ident_i2send(iph1,msg)353 ident_i2send(iph1, msg)
354 struct ph1handle *iph1;
355 vchar_t *msg;
356 {
357 int error = -1;
358
359 /* validity check */
360 if (iph1->status != PHASE1ST_MSG2RECEIVED) {
361 plog(LLV_ERROR, LOCATION, NULL,
362 "status mismatched %d.\n", iph1->status);
363 goto end;
364 }
365
366 /* fix isakmp index */
367 memcpy(&iph1->index.r_ck, &((struct isakmp *)msg->v)->r_ck,
368 sizeof(cookie_t));
369
370 /* generate DH public value */
371 if (oakley_dh_generate(iph1->approval->dhgrp,
372 &iph1->dhpub, &iph1->dhpriv) < 0)
373 goto end;
374
375 /* generate NONCE value */
376 iph1->nonce = eay_set_random(iph1->rmconf->nonce_size);
377 if (iph1->nonce == NULL)
378 goto end;
379
380 #ifdef HAVE_GSSAPI
381 if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
382 gssapi_get_itoken(iph1, NULL) < 0)
383 goto end;
384 #endif
385
386 /* create buffer to send isakmp payload */
387 iph1->sendbuf = ident_ir2mx(iph1);
388 if (iph1->sendbuf == NULL)
389 goto end;
390
391 #ifdef HAVE_PRINT_ISAKMP_C
392 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
393 #endif
394
395 /* send the packet, add to the schedule to resend */
396 if (isakmp_ph1send(iph1) == -1)
397 goto end;
398
399 /* the sending message is added to the received-list. */
400 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
401 plog(LLV_ERROR , LOCATION, NULL,
402 "failed to add a response packet to the tree.\n");
403 goto end;
404 }
405
406 iph1->status = PHASE1ST_MSG2SENT;
407
408 error = 0;
409
410 end:
411 return error;
412 }
413
414 /*
415 * receive from responder
416 * psk: HDR, KE, Nr
417 * sig: HDR, KE, Nr [, CR ]
418 * gssapi: HDR, KE, Nr, GSSr
419 * rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
420 * rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
421 */
422 int
ident_i3recv(iph1,msg)423 ident_i3recv(iph1, msg)
424 struct ph1handle *iph1;
425 vchar_t *msg;
426 {
427 vchar_t *pbuf = NULL;
428 struct isakmp_parse_t *pa;
429 int error = -1;
430 #ifdef HAVE_GSSAPI
431 vchar_t *gsstoken = NULL;
432 #endif
433 #ifdef ENABLE_NATT
434 vchar_t *natd_received;
435 int natd_seq = 0, natd_verified;
436 #endif
437
438 /* validity check */
439 if (iph1->status != PHASE1ST_MSG2SENT) {
440 plog(LLV_ERROR, LOCATION, NULL,
441 "status mismatched %d.\n", iph1->status);
442 goto end;
443 }
444
445 /* validate the type of next payload */
446 pbuf = isakmp_parse(msg);
447 if (pbuf == NULL)
448 goto end;
449
450 for (pa = (struct isakmp_parse_t *)pbuf->v;
451 pa->type != ISAKMP_NPTYPE_NONE;
452 pa++) {
453
454 switch (pa->type) {
455 case ISAKMP_NPTYPE_KE:
456 if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
457 goto end;
458 break;
459 case ISAKMP_NPTYPE_NONCE:
460 if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
461 goto end;
462 break;
463 case ISAKMP_NPTYPE_VID:
464 handle_vendorid(iph1, pa->ptr);
465 break;
466 case ISAKMP_NPTYPE_CR:
467 if (oakley_savecr(iph1, pa->ptr) < 0)
468 goto end;
469 break;
470 #ifdef HAVE_GSSAPI
471 case ISAKMP_NPTYPE_GSS:
472 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
473 goto end;
474 gssapi_save_received_token(iph1, gsstoken);
475 break;
476 #endif
477
478 #ifdef ENABLE_NATT
479 case ISAKMP_NPTYPE_NATD_DRAFT:
480 case ISAKMP_NPTYPE_NATD_RFC:
481 if (NATT_AVAILABLE(iph1) && iph1->natt_options != NULL &&
482 pa->type == iph1->natt_options->payload_nat_d) {
483 natd_received = NULL;
484 if (isakmp_p2ph (&natd_received, pa->ptr) < 0)
485 goto end;
486
487 /* set both bits first so that we can clear them
488 upon verifying hashes */
489 if (natd_seq == 0)
490 iph1->natt_flags |= NAT_DETECTED;
491
492 /* this function will clear appropriate bits bits
493 from iph1->natt_flags */
494 natd_verified = natt_compare_addr_hash (iph1,
495 natd_received, natd_seq++);
496
497 plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
498 natd_seq - 1,
499 natd_verified ? "verified" : "doesn't match");
500
501 vfree (natd_received);
502 break;
503 }
504 /* passthrough to default... */
505 #endif
506
507 default:
508 /* don't send information, see ident_r1recv() */
509 plog(LLV_ERROR, LOCATION, iph1->remote,
510 "ignore the packet, "
511 "received unexpecting payload type %d.\n",
512 pa->type);
513 goto end;
514 }
515 }
516
517 #ifdef ENABLE_NATT
518 if (NATT_AVAILABLE(iph1)) {
519 plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
520 iph1->natt_flags & NAT_DETECTED ?
521 "detected:" : "not detected",
522 iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
523 iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
524 if (iph1->natt_flags & NAT_DETECTED)
525 natt_float_ports (iph1);
526 }
527 #endif
528
529 /* payload existency check */
530 if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
531 plog(LLV_ERROR, LOCATION, iph1->remote,
532 "few isakmp message received.\n");
533 goto end;
534 }
535
536 if (oakley_checkcr(iph1) < 0) {
537 /* Ignore this error in order to be interoperability. */
538 ;
539 }
540
541 iph1->status = PHASE1ST_MSG3RECEIVED;
542
543 error = 0;
544
545 end:
546 #ifdef HAVE_GSSAPI
547 if (gsstoken)
548 vfree(gsstoken);
549 #endif
550 if (pbuf)
551 vfree(pbuf);
552 if (error) {
553 VPTRINIT(iph1->dhpub_p);
554 VPTRINIT(iph1->nonce_p);
555 VPTRINIT(iph1->id_p);
556 VPTRINIT(iph1->cr_p);
557 }
558
559 return error;
560 }
561
562 /*
563 * send to responder
564 * psk: HDR*, IDi1, HASH_I
565 * sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
566 * gssapi: HDR*, IDi1, < Gssi(n) | HASH_I >
567 * rsa: HDR*, HASH_I
568 * rev: HDR*, HASH_I
569 */
570 int
ident_i3send(iph1,msg0)571 ident_i3send(iph1, msg0)
572 struct ph1handle *iph1;
573 vchar_t *msg0;
574 {
575 int error = -1;
576 int dohash = 1;
577 #ifdef HAVE_GSSAPI
578 int len;
579 #endif
580
581 /* validity check */
582 if (iph1->status != PHASE1ST_MSG3RECEIVED) {
583 plog(LLV_ERROR, LOCATION, NULL,
584 "status mismatched %d.\n", iph1->status);
585 goto end;
586 }
587
588 /* compute sharing secret of DH */
589 if (oakley_dh_compute(iph1->approval->dhgrp, iph1->dhpub,
590 iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
591 goto end;
592
593 /* generate SKEYIDs & IV & final cipher key */
594 if (oakley_skeyid(iph1) < 0)
595 goto end;
596 if (oakley_skeyid_dae(iph1) < 0)
597 goto end;
598 if (oakley_compute_enckey(iph1) < 0)
599 goto end;
600 if (oakley_newiv(iph1) < 0)
601 goto end;
602
603 /* make ID payload into isakmp status */
604 if (ipsecdoi_setid1(iph1) < 0)
605 goto end;
606
607 #ifdef HAVE_GSSAPI
608 if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
609 gssapi_more_tokens(iph1)) {
610 plog(LLV_DEBUG, LOCATION, NULL, "calling get_itoken\n");
611 if (gssapi_get_itoken(iph1, &len) < 0)
612 goto end;
613 if (len != 0)
614 dohash = 0;
615 }
616 #endif
617
618 /* generate HASH to send */
619 if (dohash) {
620 iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
621 if (iph1->hash == NULL)
622 goto end;
623 } else
624 iph1->hash = NULL;
625
626 /* set encryption flag */
627 iph1->flags |= ISAKMP_FLAG_E;
628
629 /* create HDR;ID;HASH payload */
630 iph1->sendbuf = ident_ir3mx(iph1);
631 if (iph1->sendbuf == NULL)
632 goto end;
633
634 /* send the packet, add to the schedule to resend */
635 if (isakmp_ph1send(iph1) == -1)
636 goto end;
637
638 /* the sending message is added to the received-list. */
639 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg0) == -1) {
640 plog(LLV_ERROR , LOCATION, NULL,
641 "failed to add a response packet to the tree.\n");
642 goto end;
643 }
644
645 /* see handler.h about IV synchronization. */
646 memcpy(iph1->ivm->ive->v, iph1->ivm->iv->v, iph1->ivm->iv->l);
647
648 iph1->status = PHASE1ST_MSG3SENT;
649
650 error = 0;
651
652 end:
653 return error;
654 }
655
656 /*
657 * receive from responder
658 * psk: HDR*, IDr1, HASH_R
659 * sig: HDR*, IDr1, [ CERT, ] SIG_R
660 * gssapi: HDR*, IDr1, < GSSr(n) | HASH_R >
661 * rsa: HDR*, HASH_R
662 * rev: HDR*, HASH_R
663 */
664 int
ident_i4recv(iph1,msg0)665 ident_i4recv(iph1, msg0)
666 struct ph1handle *iph1;
667 vchar_t *msg0;
668 {
669 vchar_t *pbuf = NULL;
670 struct isakmp_parse_t *pa;
671 vchar_t *msg = NULL;
672 int error = -1;
673 int type;
674 #ifdef HAVE_GSSAPI
675 vchar_t *gsstoken = NULL;
676 #endif
677
678 /* validity check */
679 if (iph1->status != PHASE1ST_MSG3SENT) {
680 plog(LLV_ERROR, LOCATION, NULL,
681 "status mismatched %d.\n", iph1->status);
682 goto end;
683 }
684
685 /* decrypting */
686 if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
687 plog(LLV_ERROR, LOCATION, iph1->remote,
688 "ignore the packet, "
689 "expecting the packet encrypted.\n");
690 goto end;
691 }
692 msg = oakley_do_decrypt(iph1, msg0, iph1->ivm->iv, iph1->ivm->ive);
693 if (msg == NULL)
694 goto end;
695
696 /* validate the type of next payload */
697 pbuf = isakmp_parse(msg);
698 if (pbuf == NULL)
699 goto end;
700
701 iph1->pl_hash = NULL;
702
703 for (pa = (struct isakmp_parse_t *)pbuf->v;
704 pa->type != ISAKMP_NPTYPE_NONE;
705 pa++) {
706
707 switch (pa->type) {
708 case ISAKMP_NPTYPE_ID:
709 if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
710 goto end;
711 break;
712 case ISAKMP_NPTYPE_HASH:
713 iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
714 break;
715 case ISAKMP_NPTYPE_CERT:
716 if (oakley_savecert(iph1, pa->ptr) < 0)
717 goto end;
718 break;
719 case ISAKMP_NPTYPE_SIG:
720 if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
721 goto end;
722 break;
723 #ifdef HAVE_GSSAPI
724 case ISAKMP_NPTYPE_GSS:
725 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
726 goto end;
727 gssapi_save_received_token(iph1, gsstoken);
728 break;
729 #endif
730 case ISAKMP_NPTYPE_VID:
731 handle_vendorid(iph1, pa->ptr);
732 break;
733 case ISAKMP_NPTYPE_N:
734 ident_recv_n(iph1, pa->ptr);
735 break;
736 default:
737 /* don't send information, see ident_r1recv() */
738 plog(LLV_ERROR, LOCATION, iph1->remote,
739 "ignore the packet, "
740 "received unexpecting payload type %d.\n",
741 pa->type);
742 goto end;
743 }
744 }
745
746 /* payload existency check */
747
748 /* verify identifier */
749 if (ipsecdoi_checkid1(iph1) != 0) {
750 plog(LLV_ERROR, LOCATION, iph1->remote,
751 "invalid ID payload.\n");
752 goto end;
753 }
754
755 /* validate authentication value */
756 #ifdef HAVE_GSSAPI
757 if (gsstoken == NULL) {
758 #endif
759 type = oakley_validate_auth(iph1);
760 if (type != 0) {
761 if (type == -1) {
762 /* msg printed inner oakley_validate_auth() */
763 goto end;
764 }
765 evt_phase1(iph1, EVT_PHASE1_AUTH_FAILED, NULL);
766 isakmp_info_send_n1(iph1, type, NULL);
767 goto end;
768 }
769 #ifdef HAVE_GSSAPI
770 }
771 #endif
772
773 /*
774 * XXX: Should we do compare two addresses, ph1handle's and ID
775 * payload's.
776 */
777
778 plog(LLV_DEBUG, LOCATION, iph1->remote, "peer's ID:");
779 plogdump(LLV_DEBUG, iph1->id_p->v, iph1->id_p->l);
780
781 /* see handler.h about IV synchronization. */
782 memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->ive->l);
783
784 /*
785 * If we got a GSS token, we need to this roundtrip again.
786 */
787 #ifdef HAVE_GSSAPI
788 iph1->status = gsstoken != 0 ? PHASE1ST_MSG3RECEIVED :
789 PHASE1ST_MSG4RECEIVED;
790 #else
791 iph1->status = PHASE1ST_MSG4RECEIVED;
792 #endif
793
794 error = 0;
795
796 end:
797 if (pbuf)
798 vfree(pbuf);
799 if (msg)
800 vfree(msg);
801 #ifdef HAVE_GSSAPI
802 if (gsstoken)
803 vfree(gsstoken);
804 #endif
805
806 if (error) {
807 VPTRINIT(iph1->id_p);
808 VPTRINIT(iph1->cert_p);
809 VPTRINIT(iph1->crl_p);
810 VPTRINIT(iph1->sig_p);
811 }
812
813 return error;
814 }
815
816 /*
817 * status update and establish isakmp sa.
818 */
819 int
ident_i4send(iph1,msg)820 ident_i4send(iph1, msg)
821 struct ph1handle *iph1;
822 vchar_t *msg;
823 {
824 int error = -1;
825
826 /* validity check */
827 if (iph1->status != PHASE1ST_MSG4RECEIVED) {
828 plog(LLV_ERROR, LOCATION, NULL,
829 "status mismatched %d.\n", iph1->status);
830 goto end;
831 }
832
833 /* see handler.h about IV synchronization. */
834 memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->iv->l);
835
836 iph1->status = PHASE1ST_ESTABLISHED;
837
838 error = 0;
839
840 end:
841 return error;
842 }
843
844 /*
845 * receive from initiator
846 * psk: HDR, SA
847 * sig: HDR, SA
848 * rsa: HDR, SA
849 * rev: HDR, SA
850 */
851 int
ident_r1recv(iph1,msg)852 ident_r1recv(iph1, msg)
853 struct ph1handle *iph1;
854 vchar_t *msg;
855 {
856 vchar_t *pbuf = NULL;
857 struct isakmp_parse_t *pa;
858 int error = -1;
859 int vid_numeric;
860
861 /* validity check */
862 if (iph1->status != PHASE1ST_START) {
863 plog(LLV_ERROR, LOCATION, NULL,
864 "status mismatched %d.\n", iph1->status);
865 goto end;
866 }
867
868 /* validate the type of next payload */
869 /*
870 * NOTE: XXX even if multiple VID, we'll silently ignore those.
871 */
872 pbuf = isakmp_parse(msg);
873 if (pbuf == NULL)
874 goto end;
875 pa = (struct isakmp_parse_t *)pbuf->v;
876
877 /* check the position of SA payload */
878 if (pa->type != ISAKMP_NPTYPE_SA) {
879 plog(LLV_ERROR, LOCATION, iph1->remote,
880 "received invalid next payload type %d, "
881 "expecting %d.\n",
882 pa->type, ISAKMP_NPTYPE_SA);
883 goto end;
884 }
885 if (isakmp_p2ph(&iph1->sa, pa->ptr) < 0)
886 goto end;
887 pa++;
888
889 for (/*nothing*/;
890 pa->type != ISAKMP_NPTYPE_NONE;
891 pa++) {
892
893 switch (pa->type) {
894 case ISAKMP_NPTYPE_VID:
895 vid_numeric = handle_vendorid(iph1, pa->ptr);
896 #ifdef ENABLE_FRAG
897 if ((vid_numeric == VENDORID_FRAG) &&
898 (vendorid_frag_cap(pa->ptr) & VENDORID_FRAG_IDENT))
899 iph1->frag = 1;
900 #endif
901 break;
902 default:
903 /*
904 * We don't send information to the peer even
905 * if we received malformed packet. Because we
906 * can't distinguish the malformed packet and
907 * the re-sent packet. And we do same behavior
908 * when we expect encrypted packet.
909 */
910 plog(LLV_ERROR, LOCATION, iph1->remote,
911 "ignore the packet, "
912 "received unexpecting payload type %d.\n",
913 pa->type);
914 goto end;
915 }
916 }
917
918 #ifdef ENABLE_NATT
919 if (NATT_AVAILABLE(iph1))
920 plog(LLV_INFO, LOCATION, iph1->remote,
921 "Selected NAT-T version: %s\n",
922 vid_string_by_id(iph1->natt_options->version));
923 #endif
924
925 /* check SA payload and set approval SA for use */
926 if (ipsecdoi_checkph1proposal(iph1->sa, iph1) < 0) {
927 plog(LLV_ERROR, LOCATION, iph1->remote,
928 "failed to get valid proposal.\n");
929 /* XXX send information */
930 goto end;
931 }
932
933 iph1->status = PHASE1ST_MSG1RECEIVED;
934
935 error = 0;
936
937 end:
938 if (pbuf)
939 vfree(pbuf);
940 if (error) {
941 VPTRINIT(iph1->sa);
942 }
943
944 return error;
945 }
946
947 /*
948 * send to initiator
949 * psk: HDR, SA
950 * sig: HDR, SA
951 * rsa: HDR, SA
952 * rev: HDR, SA
953 */
954 int
ident_r1send(iph1,msg)955 ident_r1send(iph1, msg)
956 struct ph1handle *iph1;
957 vchar_t *msg;
958 {
959 struct payload_list *plist = NULL;
960 int error = -1;
961 vchar_t *gss_sa = NULL;
962 #ifdef HAVE_GSSAPI
963 int free_gss_sa = 0;
964 #endif
965 #ifdef ENABLE_NATT
966 vchar_t *vid_natt = NULL;
967 #endif
968 #ifdef ENABLE_HYBRID
969 vchar_t *vid_xauth = NULL;
970 vchar_t *vid_unity = NULL;
971 #endif
972 #ifdef ENABLE_DPD
973 vchar_t *vid_dpd = NULL;
974 #endif
975 #ifdef ENABLE_FRAG
976 vchar_t *vid_frag = NULL;
977 #endif
978
979 /* validity check */
980 if (iph1->status != PHASE1ST_MSG1RECEIVED) {
981 plog(LLV_ERROR, LOCATION, NULL,
982 "status mismatched %d.\n", iph1->status);
983 goto end;
984 }
985
986 /* set responder's cookie */
987 isakmp_newcookie((caddr_t)&iph1->index.r_ck, iph1->remote, iph1->local);
988
989 #ifdef HAVE_GSSAPI
990 if (iph1->approval->gssid != NULL) {
991 gss_sa = ipsecdoi_setph1proposal(iph1->rmconf, iph1->approval);
992 if (gss_sa != iph1->sa_ret)
993 free_gss_sa = 1;
994 } else
995 #endif
996 gss_sa = iph1->sa_ret;
997
998 /* set SA payload to reply */
999 plist = isakmp_plist_append(plist, gss_sa, ISAKMP_NPTYPE_SA);
1000
1001 #ifdef ENABLE_HYBRID
1002 if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_XAUTH) {
1003 plog (LLV_INFO, LOCATION, NULL, "Adding xauth VID payload.\n");
1004 if ((vid_xauth = set_vendorid(VENDORID_XAUTH)) == NULL) {
1005 plog(LLV_ERROR, LOCATION, NULL,
1006 "Cannot create Xauth vendor ID\n");
1007 goto end;
1008 }
1009 plist = isakmp_plist_append(plist,
1010 vid_xauth, ISAKMP_NPTYPE_VID);
1011 }
1012
1013 if (iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_UNITY) {
1014 if ((vid_unity = set_vendorid(VENDORID_UNITY)) == NULL) {
1015 plog(LLV_ERROR, LOCATION, NULL,
1016 "Cannot create Unity vendor ID\n");
1017 goto end;
1018 }
1019 plist = isakmp_plist_append(plist,
1020 vid_unity, ISAKMP_NPTYPE_VID);
1021 }
1022 #endif
1023 #ifdef ENABLE_NATT
1024 /* Has the peer announced NAT-T? */
1025 if (NATT_AVAILABLE(iph1))
1026 vid_natt = set_vendorid(iph1->natt_options->version);
1027
1028 if (vid_natt)
1029 plist = isakmp_plist_append(plist, vid_natt, ISAKMP_NPTYPE_VID);
1030 #endif
1031 #ifdef ENABLE_DPD
1032 if (iph1->dpd_support) {
1033 vid_dpd = set_vendorid(VENDORID_DPD);
1034 if (vid_dpd != NULL)
1035 plist = isakmp_plist_append(plist, vid_dpd, ISAKMP_NPTYPE_VID);
1036 }
1037 #endif
1038 #ifdef ENABLE_FRAG
1039 if (iph1->frag) {
1040 vid_frag = set_vendorid(VENDORID_FRAG);
1041 if (vid_frag != NULL)
1042 vid_frag = isakmp_frag_addcap(vid_frag,
1043 VENDORID_FRAG_IDENT);
1044 if (vid_frag == NULL)
1045 plog(LLV_ERROR, LOCATION, NULL,
1046 "Frag vendorID construction failed\n");
1047 else
1048 plist = isakmp_plist_append(plist,
1049 vid_frag, ISAKMP_NPTYPE_VID);
1050 }
1051 #endif
1052
1053 iph1->sendbuf = isakmp_plist_set_all (&plist, iph1);
1054
1055 #ifdef HAVE_PRINT_ISAKMP_C
1056 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
1057 #endif
1058
1059 /* send the packet, add to the schedule to resend */
1060 if (isakmp_ph1send(iph1) == -1)
1061 goto end;
1062
1063 /* the sending message is added to the received-list. */
1064 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
1065 plog(LLV_ERROR , LOCATION, NULL,
1066 "failed to add a response packet to the tree.\n");
1067 goto end;
1068 }
1069
1070 iph1->status = PHASE1ST_MSG1SENT;
1071
1072 error = 0;
1073
1074 end:
1075 #ifdef HAVE_GSSAPI
1076 if (free_gss_sa)
1077 vfree(gss_sa);
1078 #endif
1079 #ifdef ENABLE_NATT
1080 if (vid_natt)
1081 vfree(vid_natt);
1082 #endif
1083 #ifdef ENABLE_HYBRID
1084 if (vid_xauth != NULL)
1085 vfree(vid_xauth);
1086 if (vid_unity != NULL)
1087 vfree(vid_unity);
1088 #endif
1089 #ifdef ENABLE_DPD
1090 if (vid_dpd != NULL)
1091 vfree(vid_dpd);
1092 #endif
1093 #ifdef ENABLE_FRAG
1094 if (vid_frag != NULL)
1095 vfree(vid_frag);
1096 #endif
1097
1098 return error;
1099 }
1100
1101 /*
1102 * receive from initiator
1103 * psk: HDR, KE, Ni
1104 * sig: HDR, KE, Ni
1105 * gssapi: HDR, KE, Ni, GSSi
1106 * rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
1107 * rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
1108 * <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
1109 */
1110 int
ident_r2recv(iph1,msg)1111 ident_r2recv(iph1, msg)
1112 struct ph1handle *iph1;
1113 vchar_t *msg;
1114 {
1115 vchar_t *pbuf = NULL;
1116 struct isakmp_parse_t *pa;
1117 int error = -1;
1118 #ifdef HAVE_GSSAPI
1119 vchar_t *gsstoken = NULL;
1120 #endif
1121 #ifdef ENABLE_NATT
1122 int natd_seq = 0;
1123 #endif
1124
1125 /* validity check */
1126 if (iph1->status != PHASE1ST_MSG1SENT) {
1127 plog(LLV_ERROR, LOCATION, NULL,
1128 "status mismatched %d.\n", iph1->status);
1129 goto end;
1130 }
1131
1132 /* validate the type of next payload */
1133 pbuf = isakmp_parse(msg);
1134 if (pbuf == NULL)
1135 goto end;
1136
1137 for (pa = (struct isakmp_parse_t *)pbuf->v;
1138 pa->type != ISAKMP_NPTYPE_NONE;
1139 pa++) {
1140 switch (pa->type) {
1141 case ISAKMP_NPTYPE_KE:
1142 if (isakmp_p2ph(&iph1->dhpub_p, pa->ptr) < 0)
1143 goto end;
1144 break;
1145 case ISAKMP_NPTYPE_NONCE:
1146 if (isakmp_p2ph(&iph1->nonce_p, pa->ptr) < 0)
1147 goto end;
1148 break;
1149 case ISAKMP_NPTYPE_VID:
1150 handle_vendorid(iph1, pa->ptr);
1151 break;
1152 case ISAKMP_NPTYPE_CR:
1153 plog(LLV_WARNING, LOCATION, iph1->remote,
1154 "CR received, ignore it. "
1155 "It should be in other exchange.\n");
1156 break;
1157 #ifdef HAVE_GSSAPI
1158 case ISAKMP_NPTYPE_GSS:
1159 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
1160 goto end;
1161 gssapi_save_received_token(iph1, gsstoken);
1162 break;
1163 #endif
1164
1165 #ifdef ENABLE_NATT
1166 case ISAKMP_NPTYPE_NATD_DRAFT:
1167 case ISAKMP_NPTYPE_NATD_RFC:
1168 if (NATT_AVAILABLE(iph1) && iph1->natt_options != NULL &&
1169 pa->type == iph1->natt_options->payload_nat_d)
1170 {
1171 vchar_t *natd_received = NULL;
1172 int natd_verified;
1173
1174 if (isakmp_p2ph (&natd_received, pa->ptr) < 0)
1175 goto end;
1176
1177 if (natd_seq == 0)
1178 iph1->natt_flags |= NAT_DETECTED;
1179
1180 natd_verified = natt_compare_addr_hash (iph1,
1181 natd_received, natd_seq++);
1182
1183 plog (LLV_INFO, LOCATION, NULL, "NAT-D payload #%d %s\n",
1184 natd_seq - 1,
1185 natd_verified ? "verified" : "doesn't match");
1186
1187 vfree (natd_received);
1188 break;
1189 }
1190 /* passthrough to default... */
1191 #endif
1192
1193 default:
1194 /* don't send information, see ident_r1recv() */
1195 plog(LLV_ERROR, LOCATION, iph1->remote,
1196 "ignore the packet, "
1197 "received unexpecting payload type %d.\n",
1198 pa->type);
1199 goto end;
1200 }
1201 }
1202
1203 #ifdef ENABLE_NATT
1204 if (NATT_AVAILABLE(iph1))
1205 plog (LLV_INFO, LOCATION, NULL, "NAT %s %s%s\n",
1206 iph1->natt_flags & NAT_DETECTED ?
1207 "detected:" : "not detected",
1208 iph1->natt_flags & NAT_DETECTED_ME ? "ME " : "",
1209 iph1->natt_flags & NAT_DETECTED_PEER ? "PEER" : "");
1210 #endif
1211
1212 /* payload existency check */
1213 if (iph1->dhpub_p == NULL || iph1->nonce_p == NULL) {
1214 plog(LLV_ERROR, LOCATION, iph1->remote,
1215 "few isakmp message received.\n");
1216 goto end;
1217 }
1218
1219 iph1->status = PHASE1ST_MSG2RECEIVED;
1220
1221 error = 0;
1222
1223 end:
1224 if (pbuf)
1225 vfree(pbuf);
1226 #ifdef HAVE_GSSAPI
1227 if (gsstoken)
1228 vfree(gsstoken);
1229 #endif
1230
1231 if (error) {
1232 VPTRINIT(iph1->dhpub_p);
1233 VPTRINIT(iph1->nonce_p);
1234 VPTRINIT(iph1->id_p);
1235 }
1236
1237 return error;
1238 }
1239
1240 /*
1241 * send to initiator
1242 * psk: HDR, KE, Nr
1243 * sig: HDR, KE, Nr [, CR ]
1244 * gssapi: HDR, KE, Nr, GSSr
1245 * rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
1246 * rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
1247 */
1248 int
ident_r2send(iph1,msg)1249 ident_r2send(iph1, msg)
1250 struct ph1handle *iph1;
1251 vchar_t *msg;
1252 {
1253 int error = -1;
1254
1255 /* validity check */
1256 if (iph1->status != PHASE1ST_MSG2RECEIVED) {
1257 plog(LLV_ERROR, LOCATION, NULL,
1258 "status mismatched %d.\n", iph1->status);
1259 goto end;
1260 }
1261
1262 /* generate DH public value */
1263 if (oakley_dh_generate(iph1->approval->dhgrp,
1264 &iph1->dhpub, &iph1->dhpriv) < 0)
1265 goto end;
1266
1267 /* generate NONCE value */
1268 iph1->nonce = eay_set_random(RMCONF_NONCE_SIZE(iph1->rmconf));
1269 if (iph1->nonce == NULL)
1270 goto end;
1271
1272 #ifdef HAVE_GSSAPI
1273 if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
1274 gssapi_get_rtoken(iph1, NULL);
1275 #endif
1276
1277 /* create HDR;KE;NONCE payload */
1278 iph1->sendbuf = ident_ir2mx(iph1);
1279 if (iph1->sendbuf == NULL)
1280 goto end;
1281
1282 #ifdef HAVE_PRINT_ISAKMP_C
1283 isakmp_printpacket(iph1->sendbuf, iph1->local, iph1->remote, 0);
1284 #endif
1285
1286 /* send the packet, add to the schedule to resend */
1287 if (isakmp_ph1send(iph1) == -1)
1288 goto end;
1289
1290 /* the sending message is added to the received-list. */
1291 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
1292 plog(LLV_ERROR , LOCATION, NULL,
1293 "failed to add a response packet to the tree.\n");
1294 goto end;
1295 }
1296
1297 /* compute sharing secret of DH */
1298 if (oakley_dh_compute(iph1->approval->dhgrp, iph1->dhpub,
1299 iph1->dhpriv, iph1->dhpub_p, &iph1->dhgxy) < 0)
1300 goto end;
1301
1302 /* generate SKEYIDs & IV & final cipher key */
1303 if (oakley_skeyid(iph1) < 0)
1304 goto end;
1305 if (oakley_skeyid_dae(iph1) < 0)
1306 goto end;
1307 if (oakley_compute_enckey(iph1) < 0)
1308 goto end;
1309 if (oakley_newiv(iph1) < 0)
1310 goto end;
1311
1312 iph1->status = PHASE1ST_MSG2SENT;
1313
1314 error = 0;
1315
1316 end:
1317 return error;
1318 }
1319
1320 /*
1321 * receive from initiator
1322 * psk: HDR*, IDi1, HASH_I
1323 * sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
1324 * gssapi: HDR*, [ IDi1, ] < GSSi(n) | HASH_I >
1325 * rsa: HDR*, HASH_I
1326 * rev: HDR*, HASH_I
1327 */
1328 int
ident_r3recv(iph1,msg0)1329 ident_r3recv(iph1, msg0)
1330 struct ph1handle *iph1;
1331 vchar_t *msg0;
1332 {
1333 vchar_t *msg = NULL;
1334 vchar_t *pbuf = NULL;
1335 struct isakmp_parse_t *pa;
1336 int error = -1;
1337 int type;
1338 #ifdef HAVE_GSSAPI
1339 vchar_t *gsstoken = NULL;
1340 #endif
1341
1342 /* validity check */
1343 if (iph1->status != PHASE1ST_MSG2SENT) {
1344 plog(LLV_ERROR, LOCATION, NULL,
1345 "status mismatched %d.\n", iph1->status);
1346 goto end;
1347 }
1348
1349 /* decrypting */
1350 if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
1351 plog(LLV_ERROR, LOCATION, iph1->remote,
1352 "reject the packet, "
1353 "expecting the packet encrypted.\n");
1354 goto end;
1355 }
1356 msg = oakley_do_decrypt(iph1, msg0, iph1->ivm->iv, iph1->ivm->ive);
1357 if (msg == NULL)
1358 goto end;
1359
1360 /* validate the type of next payload */
1361 pbuf = isakmp_parse(msg);
1362 if (pbuf == NULL)
1363 goto end;
1364
1365 iph1->pl_hash = NULL;
1366
1367 for (pa = (struct isakmp_parse_t *)pbuf->v;
1368 pa->type != ISAKMP_NPTYPE_NONE;
1369 pa++) {
1370
1371 switch (pa->type) {
1372 case ISAKMP_NPTYPE_ID:
1373 if (isakmp_p2ph(&iph1->id_p, pa->ptr) < 0)
1374 goto end;
1375 if (resolveph1rmconf(iph1) < 0)
1376 goto end;
1377 break;
1378 case ISAKMP_NPTYPE_HASH:
1379 iph1->pl_hash = (struct isakmp_pl_hash *)pa->ptr;
1380 break;
1381 case ISAKMP_NPTYPE_CR:
1382 if (oakley_savecr(iph1, pa->ptr) < 0)
1383 goto end;
1384 break;
1385 case ISAKMP_NPTYPE_CERT:
1386 if (oakley_savecert(iph1, pa->ptr) < 0)
1387 goto end;
1388 break;
1389 case ISAKMP_NPTYPE_SIG:
1390 if (isakmp_p2ph(&iph1->sig_p, pa->ptr) < 0)
1391 goto end;
1392 break;
1393 #ifdef HAVE_GSSAPI
1394 case ISAKMP_NPTYPE_GSS:
1395 if (isakmp_p2ph(&gsstoken, pa->ptr) < 0)
1396 goto end;
1397 gssapi_save_received_token(iph1, gsstoken);
1398 break;
1399 #endif
1400 case ISAKMP_NPTYPE_VID:
1401 handle_vendorid(iph1, pa->ptr);
1402 break;
1403 case ISAKMP_NPTYPE_N:
1404 ident_recv_n(iph1, pa->ptr);
1405 break;
1406 default:
1407 /* don't send information, see ident_r1recv() */
1408 plog(LLV_ERROR, LOCATION, iph1->remote,
1409 "ignore the packet, "
1410 "received unexpecting payload type %d.\n",
1411 pa->type);
1412 goto end;
1413 }
1414 }
1415
1416 /* payload existency check */
1417 /* XXX same as ident_i4recv(), should be merged. */
1418 {
1419 int ng = 0;
1420
1421 switch (iph1->approval->authmethod) {
1422 case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
1423 #ifdef ENABLE_HYBRID
1424 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R:
1425 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R:
1426 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R:
1427 #endif
1428 if (iph1->id_p == NULL || iph1->pl_hash == NULL)
1429 ng++;
1430 break;
1431 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
1432 case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
1433 #ifdef ENABLE_HYBRID
1434 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R:
1435 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R:
1436 #endif
1437 if (iph1->id_p == NULL || iph1->sig_p == NULL)
1438 ng++;
1439 break;
1440 case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
1441 case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
1442 #ifdef ENABLE_HYBRID
1443 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R:
1444 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R:
1445 #endif
1446 if (iph1->pl_hash == NULL)
1447 ng++;
1448 break;
1449 #ifdef HAVE_GSSAPI
1450 case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
1451 if (gsstoken == NULL && iph1->pl_hash == NULL)
1452 ng++;
1453 break;
1454 #endif
1455 default:
1456 plog(LLV_ERROR, LOCATION, iph1->remote,
1457 "invalid authmethod %d why ?\n",
1458 iph1->approval->authmethod);
1459 goto end;
1460 }
1461 if (ng) {
1462 plog(LLV_ERROR, LOCATION, iph1->remote,
1463 "few isakmp message received.\n");
1464 goto end;
1465 }
1466 }
1467
1468 /* verify identifier */
1469 if (ipsecdoi_checkid1(iph1) != 0) {
1470 plog(LLV_ERROR, LOCATION, iph1->remote,
1471 "invalid ID payload.\n");
1472 goto end;
1473 }
1474
1475 /* validate authentication value */
1476 #ifdef HAVE_GSSAPI
1477 if (gsstoken == NULL) {
1478 #endif
1479 type = oakley_validate_auth(iph1);
1480 if (type != 0) {
1481 if (type == -1) {
1482 /* msg printed inner oakley_validate_auth() */
1483 goto end;
1484 }
1485 evt_phase1(iph1, EVT_PHASE1_AUTH_FAILED, NULL);
1486 isakmp_info_send_n1(iph1, type, NULL);
1487 goto end;
1488 }
1489 #ifdef HAVE_GSSAPI
1490 }
1491 #endif
1492
1493 if (oakley_checkcr(iph1) < 0) {
1494 /* Ignore this error in order to be interoperability. */
1495 ;
1496 }
1497
1498 /*
1499 * XXX: Should we do compare two addresses, ph1handle's and ID
1500 * payload's.
1501 */
1502
1503 plog(LLV_DEBUG, LOCATION, iph1->remote, "peer's ID\n");
1504 plogdump(LLV_DEBUG, iph1->id_p->v, iph1->id_p->l);
1505
1506 /* see handler.h about IV synchronization. */
1507 memcpy(iph1->ivm->iv->v, iph1->ivm->ive->v, iph1->ivm->ive->l);
1508
1509 #ifdef HAVE_GSSAPI
1510 iph1->status = gsstoken != NULL ? PHASE1ST_MSG2RECEIVED :
1511 PHASE1ST_MSG3RECEIVED;
1512 #else
1513 iph1->status = PHASE1ST_MSG3RECEIVED;
1514 #endif
1515
1516 error = 0;
1517
1518 end:
1519 if (pbuf)
1520 vfree(pbuf);
1521 if (msg)
1522 vfree(msg);
1523 #ifdef HAVE_GSSAPI
1524 if (gsstoken)
1525 vfree(gsstoken);
1526 #endif
1527
1528 if (error) {
1529 VPTRINIT(iph1->id_p);
1530 VPTRINIT(iph1->cert_p);
1531 VPTRINIT(iph1->crl_p);
1532 VPTRINIT(iph1->sig_p);
1533 VPTRINIT(iph1->cr_p);
1534 }
1535
1536 return error;
1537 }
1538
1539 /*
1540 * send to initiator
1541 * psk: HDR*, IDr1, HASH_R
1542 * sig: HDR*, IDr1, [ CERT, ] SIG_R
1543 * gssapi: HDR*, IDr1, < GSSr(n) | HASH_R >
1544 * rsa: HDR*, HASH_R
1545 * rev: HDR*, HASH_R
1546 */
1547 int
ident_r3send(iph1,msg)1548 ident_r3send(iph1, msg)
1549 struct ph1handle *iph1;
1550 vchar_t *msg;
1551 {
1552 int error = -1;
1553 int dohash = 1;
1554 #ifdef HAVE_GSSAPI
1555 int len;
1556 #endif
1557
1558 /* validity check */
1559 if (iph1->status != PHASE1ST_MSG3RECEIVED) {
1560 plog(LLV_ERROR, LOCATION, NULL,
1561 "status mismatched %d.\n", iph1->status);
1562 goto end;
1563 }
1564
1565 /* make ID payload into isakmp status */
1566 if (ipsecdoi_setid1(iph1) < 0)
1567 goto end;
1568
1569 #ifdef HAVE_GSSAPI
1570 if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB &&
1571 gssapi_more_tokens(iph1)) {
1572 gssapi_get_rtoken(iph1, &len);
1573 if (len != 0)
1574 dohash = 0;
1575 }
1576 #endif
1577
1578 if (dohash) {
1579 /* generate HASH to send */
1580 plog(LLV_DEBUG, LOCATION, NULL, "generate HASH_R\n");
1581 iph1->hash = oakley_ph1hash_common(iph1, GENERATE);
1582 if (iph1->hash == NULL)
1583 goto end;
1584 } else
1585 iph1->hash = NULL;
1586
1587 /* set encryption flag */
1588 iph1->flags |= ISAKMP_FLAG_E;
1589
1590 /* create HDR;ID;HASH payload */
1591 iph1->sendbuf = ident_ir3mx(iph1);
1592 if (iph1->sendbuf == NULL)
1593 goto end;
1594
1595 /* send HDR;ID;HASH to responder */
1596 if (isakmp_send(iph1, iph1->sendbuf) < 0)
1597 goto end;
1598
1599 /* the sending message is added to the received-list. */
1600 if (add_recvdpkt(iph1->remote, iph1->local, iph1->sendbuf, msg) == -1) {
1601 plog(LLV_ERROR , LOCATION, NULL,
1602 "failed to add a response packet to the tree.\n");
1603 goto end;
1604 }
1605
1606 /* see handler.h about IV synchronization. */
1607 memcpy(iph1->ivm->ive->v, iph1->ivm->iv->v, iph1->ivm->iv->l);
1608
1609 iph1->status = PHASE1ST_ESTABLISHED;
1610
1611 error = 0;
1612
1613 end:
1614
1615 return error;
1616 }
1617
1618 /*
1619 * This is used in main mode for:
1620 * initiator's 3rd exchange send to responder
1621 * psk: HDR, KE, Ni
1622 * sig: HDR, KE, Ni
1623 * rsa: HDR, KE, [ HASH(1), ] <IDi1_b>PubKey_r, <Ni_b>PubKey_r
1624 * rev: HDR, [ HASH(1), ] <Ni_b>Pubkey_r, <KE_b>Ke_i,
1625 * <IDi1_b>Ke_i, [<<Cert-I_b>Ke_i]
1626 * responders 2nd exchnage send to initiator
1627 * psk: HDR, KE, Nr
1628 * sig: HDR, KE, Nr [, CR ]
1629 * rsa: HDR, KE, <IDr1_b>PubKey_i, <Nr_b>PubKey_i
1630 * rev: HDR, <Nr_b>PubKey_i, <KE_b>Ke_r, <IDr1_b>Ke_r,
1631 */
1632 static vchar_t *
ident_ir2mx(iph1)1633 ident_ir2mx(iph1)
1634 struct ph1handle *iph1;
1635 {
1636 vchar_t *buf = 0;
1637 struct payload_list *plist = NULL;
1638 vchar_t *vid = NULL;
1639 int error = -1;
1640 #ifdef HAVE_GSSAPI
1641 vchar_t *gsstoken = NULL;
1642 #endif
1643 #ifdef ENABLE_NATT
1644 vchar_t *natd[2] = { NULL, NULL };
1645 #endif
1646
1647 #ifdef HAVE_GSSAPI
1648 if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB) {
1649 if (gssapi_get_token_to_send(iph1, &gsstoken) < 0) {
1650 plog(LLV_ERROR, LOCATION, NULL,
1651 "Failed to get gssapi token.\n");
1652 goto end;
1653 }
1654 }
1655 #endif
1656
1657 /* create isakmp KE payload */
1658 plist = isakmp_plist_append(plist, iph1->dhpub, ISAKMP_NPTYPE_KE);
1659
1660 /* create isakmp NONCE payload */
1661 plist = isakmp_plist_append(plist, iph1->nonce, ISAKMP_NPTYPE_NONCE);
1662
1663 #ifdef HAVE_GSSAPI
1664 if (iph1->approval->authmethod == OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB)
1665 plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
1666 #endif
1667
1668 /* append vendor id, if needed */
1669 if (vid)
1670 plist = isakmp_plist_append(plist, vid, ISAKMP_NPTYPE_VID);
1671
1672 /* create CR if need */
1673 if (iph1->side == RESPONDER &&
1674 oakley_needcr(iph1->approval->authmethod))
1675 plist = oakley_append_cr(plist, iph1);
1676
1677 #ifdef ENABLE_NATT
1678 /* generate and append NAT-D payloads */
1679 if (NATT_AVAILABLE(iph1) && iph1->status == PHASE1ST_MSG2RECEIVED)
1680 {
1681 if ((natd[0] = natt_hash_addr (iph1, iph1->remote)) == NULL) {
1682 plog(LLV_ERROR, LOCATION, NULL,
1683 "NAT-D hashing failed for %s\n", saddr2str(iph1->remote));
1684 goto end;
1685 }
1686
1687 if ((natd[1] = natt_hash_addr (iph1, iph1->local)) == NULL) {
1688 plog(LLV_ERROR, LOCATION, NULL,
1689 "NAT-D hashing failed for %s\n", saddr2str(iph1->local));
1690 goto end;
1691 }
1692
1693 plog (LLV_INFO, LOCATION, NULL, "Adding remote and local NAT-D payloads.\n");
1694 plist = isakmp_plist_append(plist, natd[0], iph1->natt_options->payload_nat_d);
1695 plist = isakmp_plist_append(plist, natd[1], iph1->natt_options->payload_nat_d);
1696 }
1697 #endif
1698
1699 buf = isakmp_plist_set_all (&plist, iph1);
1700
1701 error = 0;
1702
1703 end:
1704 if (error && buf != NULL) {
1705 vfree(buf);
1706 buf = NULL;
1707 }
1708 #ifdef HAVE_GSSAPI
1709 if (gsstoken)
1710 vfree(gsstoken);
1711 #endif
1712 if (vid)
1713 vfree(vid);
1714
1715 #ifdef ENABLE_NATT
1716 if (natd[0])
1717 vfree(natd[0]);
1718 if (natd[1])
1719 vfree(natd[1]);
1720 #endif
1721
1722 return buf;
1723 }
1724
1725 /*
1726 * This is used in main mode for:
1727 * initiator's 4th exchange send to responder
1728 * psk: HDR*, IDi1, HASH_I
1729 * sig: HDR*, IDi1, [ CR, ] [ CERT, ] SIG_I
1730 * gssapi: HDR*, [ IDi1, ] < GSSi(n) | HASH_I >
1731 * rsa: HDR*, HASH_I
1732 * rev: HDR*, HASH_I
1733 * responders 3rd exchnage send to initiator
1734 * psk: HDR*, IDr1, HASH_R
1735 * sig: HDR*, IDr1, [ CERT, ] SIG_R
1736 * gssapi: HDR*, [ IDr1, ] < GSSr(n) | HASH_R >
1737 * rsa: HDR*, HASH_R
1738 * rev: HDR*, HASH_R
1739 */
1740 static vchar_t *
ident_ir3mx(iph1)1741 ident_ir3mx(iph1)
1742 struct ph1handle *iph1;
1743 {
1744 struct payload_list *plist = NULL;
1745 vchar_t *buf = NULL, *new = NULL;
1746 int need_cert = 0;
1747 int error = -1;
1748 #ifdef HAVE_GSSAPI
1749 vchar_t *gsstoken = NULL;
1750 vchar_t *gsshash = NULL;
1751 #endif
1752
1753 switch (iph1->approval->authmethod) {
1754 case OAKLEY_ATTR_AUTH_METHOD_PSKEY:
1755 #ifdef ENABLE_HYBRID
1756 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_I:
1757 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_PSKEY_R:
1758 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I:
1759 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I:
1760 #endif
1761 /* create isakmp ID payload */
1762 plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
1763
1764 /* create isakmp HASH payload */
1765 plist = isakmp_plist_append(plist, iph1->hash, ISAKMP_NPTYPE_HASH);
1766 break;
1767 case OAKLEY_ATTR_AUTH_METHOD_DSSSIG:
1768 case OAKLEY_ATTR_AUTH_METHOD_RSASIG:
1769 #ifdef ENABLE_HYBRID
1770 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R:
1771 case OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R:
1772 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_I:
1773 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSASIG_R:
1774 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_I:
1775 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_DSSSIG_R:
1776 #endif
1777 if (oakley_getmycert(iph1) < 0)
1778 goto end;
1779
1780 if (oakley_getsign(iph1) < 0)
1781 goto end;
1782
1783 if (iph1->cert != NULL && iph1->rmconf->send_cert)
1784 need_cert = 1;
1785
1786 /* add ID payload */
1787 plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
1788
1789 /* add CERT payload if there */
1790 if (need_cert)
1791 plist = isakmp_plist_append(plist, iph1->cert,
1792 ISAKMP_NPTYPE_CERT);
1793 /* add SIG payload */
1794 plist = isakmp_plist_append(plist, iph1->sig, ISAKMP_NPTYPE_SIG);
1795
1796 /* create isakmp CR payload */
1797 if (iph1->side == INITIATOR &&
1798 oakley_needcr(iph1->approval->authmethod))
1799 plist = oakley_append_cr(plist, iph1);
1800 break;
1801 #ifdef HAVE_GSSAPI
1802 case OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB:
1803 if (iph1->hash != NULL) {
1804 gsshash = gssapi_wraphash(iph1);
1805 if (gsshash == NULL)
1806 goto end;
1807 } else {
1808 if (gssapi_get_token_to_send(iph1, &gsstoken) < 0) {
1809 plog(LLV_ERROR, LOCATION, NULL,
1810 "Failed to get gssapi token.\n");
1811 goto end;
1812 }
1813 }
1814
1815 if (!gssapi_id_sent(iph1)) {
1816 /* create isakmp ID payload */
1817 plist = isakmp_plist_append(plist, iph1->id, ISAKMP_NPTYPE_ID);
1818 gssapi_set_id_sent(iph1);
1819 }
1820
1821 if (iph1->hash != NULL)
1822 /* create isakmp HASH payload */
1823 plist = isakmp_plist_append(plist, gsshash, ISAKMP_NPTYPE_HASH);
1824 else
1825 plist = isakmp_plist_append(plist, gsstoken, ISAKMP_NPTYPE_GSS);
1826 break;
1827 #endif
1828 case OAKLEY_ATTR_AUTH_METHOD_RSAENC:
1829 case OAKLEY_ATTR_AUTH_METHOD_RSAREV:
1830 #ifdef ENABLE_HYBRID
1831 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_I:
1832 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAENC_R:
1833 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_I:
1834 case OAKLEY_ATTR_AUTH_METHOD_XAUTH_RSAREV_R:
1835 #endif
1836 plog(LLV_ERROR, LOCATION, NULL,
1837 "not supported authentication type %d\n",
1838 iph1->approval->authmethod);
1839 goto end;
1840 default:
1841 plog(LLV_ERROR, LOCATION, NULL,
1842 "invalid authentication type %d\n",
1843 iph1->approval->authmethod);
1844 goto end;
1845 }
1846
1847 buf = isakmp_plist_set_all (&plist, iph1);
1848
1849 #ifdef HAVE_PRINT_ISAKMP_C
1850 isakmp_printpacket(buf, iph1->local, iph1->remote, 1);
1851 #endif
1852
1853 /* encoding */
1854 new = oakley_do_encrypt(iph1, buf, iph1->ivm->ive, iph1->ivm->iv);
1855 if (new == NULL)
1856 goto end;
1857
1858 vfree(buf);
1859
1860 buf = new;
1861
1862 error = 0;
1863
1864 end:
1865 #ifdef HAVE_GSSAPI
1866 if (gsstoken)
1867 vfree(gsstoken);
1868 #endif
1869 if (error && buf != NULL) {
1870 vfree(buf);
1871 buf = NULL;
1872 }
1873
1874 return buf;
1875 }
1876
1877 /*
1878 * handle a notification payload inside identity exchange.
1879 * called only when the packet has been verified to be encrypted.
1880 */
1881 static int
ident_recv_n(iph1,gen)1882 ident_recv_n(iph1, gen)
1883 struct ph1handle *iph1;
1884 struct isakmp_gen *gen;
1885 {
1886 struct isakmp_pl_n *notify = (struct isakmp_pl_n *) gen;
1887 u_int type;
1888
1889 type = ntohs(notify->type);
1890 switch (type) {
1891 case ISAKMP_NTYPE_INITIAL_CONTACT:
1892 iph1->initial_contact_received = TRUE;
1893 break;
1894 default:
1895 isakmp_log_notify(iph1, notify, "identity exchange");
1896 break;
1897 }
1898 return 0;
1899 }
1900
1901