5715476e177bc55d063ca36deae53ce20f3d96d0
[strongswan.git] / src / libhydra / plugins / kernel_pfkey / kernel_pfkey_ipsec.c
1 /*
2 * Copyright (C) 2008-2012 Tobias Brunner
3 * Copyright (C) 2008 Andreas Steffen
4 * Hochschule fuer Technik Rapperswil
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 */
16 /*
17 * Copyright (C) 2014 Nanoteq Pty Ltd
18 *
19 * Permission is hereby granted, free of charge, to any person obtaining a copy
20 * of this software and associated documentation files (the "Software"), to deal
21 * in the Software without restriction, including without limitation the rights
22 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
23 * copies of the Software, and to permit persons to whom the Software is
24 * furnished to do so, subject to the following conditions:
25 *
26 * The above copyright notice and this permission notice shall be included in
27 * all copies or substantial portions of the Software.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
30 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
32 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
33 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
34 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
35 * THE SOFTWARE.
36 */
37
38 #include <stdint.h>
39 #include <sys/types.h>
40 #include <sys/socket.h>
41
42 #ifdef __FreeBSD__
43 #include <limits.h> /* for LONG_MAX */
44 #endif
45
46 #ifdef HAVE_NET_PFKEYV2_H
47 #include <net/pfkeyv2.h>
48 #else
49 #include <linux/pfkeyv2.h>
50 #endif
51
52 #ifdef SADB_X_EXT_NAT_T_TYPE
53 #define HAVE_NATT
54 #endif
55
56 #ifdef HAVE_NETIPSEC_IPSEC_H
57 #include <netipsec/ipsec.h>
58 #elif defined(HAVE_NETINET6_IPSEC_H)
59 #include <netinet6/ipsec.h>
60 #else
61 #include <linux/ipsec.h>
62 #endif
63
64 #ifdef HAVE_NATT
65 #ifdef HAVE_LINUX_UDP_H
66 #include <linux/udp.h>
67 #else
68 #include <netinet/udp.h>
69 #endif /*HAVE_LINUX_UDP_H*/
70 #endif /*HAVE_NATT*/
71
72 #include <unistd.h>
73 #include <time.h>
74 #include <errno.h>
75 #ifdef __APPLE__
76 #include <sys/sysctl.h>
77 #endif
78
79 #include "kernel_pfkey_ipsec.h"
80
81 #include <hydra.h>
82 #include <utils/debug.h>
83 #include <networking/host.h>
84 #include <collections/linked_list.h>
85 #include <collections/hashtable.h>
86 #include <threading/mutex.h>
87
88 /** non linux specific */
89 #ifndef IPPROTO_COMP
90 #ifdef IPPROTO_IPCOMP
91 #define IPPROTO_COMP IPPROTO_IPCOMP
92 #endif
93 #endif
94
95 #ifndef SADB_X_AALG_SHA2_256HMAC
96 #define SADB_X_AALG_SHA2_256HMAC SADB_X_AALG_SHA2_256
97 #define SADB_X_AALG_SHA2_384HMAC SADB_X_AALG_SHA2_384
98 #define SADB_X_AALG_SHA2_512HMAC SADB_X_AALG_SHA2_512
99 #endif
100
101 #ifndef SADB_X_EALG_AESCBC
102 #define SADB_X_EALG_AESCBC SADB_X_EALG_AES
103 #endif
104
105 #ifndef SADB_X_EALG_CASTCBC
106 #define SADB_X_EALG_CASTCBC SADB_X_EALG_CAST128CBC
107 #endif
108
109 #ifndef SOL_IP
110 #define SOL_IP IPPROTO_IP
111 #define SOL_IPV6 IPPROTO_IPV6
112 #endif
113
114 /** from linux/in.h */
115 #ifndef IP_IPSEC_POLICY
116 #define IP_IPSEC_POLICY 16
117 #endif
118
119 /** missing on uclibc */
120 #ifndef IPV6_IPSEC_POLICY
121 #define IPV6_IPSEC_POLICY 34
122 #endif
123
124 /* from linux/udp.h */
125 #ifndef UDP_ENCAP
126 #define UDP_ENCAP 100
127 #endif
128
129 #ifndef UDP_ENCAP_ESPINUDP
130 #define UDP_ENCAP_ESPINUDP 2
131 #endif
132
133 /* this is not defined on some platforms */
134 #ifndef SOL_UDP
135 #define SOL_UDP IPPROTO_UDP
136 #endif
137
138 /** base priority for installed policies */
139 #define PRIO_BASE 384
140
141 #ifdef __APPLE__
142 /** from xnu/bsd/net/pfkeyv2.h */
143 #define SADB_X_EXT_NATT 0x002
144 struct sadb_sa_2 {
145 struct sadb_sa sa;
146 u_int16_t sadb_sa_natt_port;
147 u_int16_t sadb_reserved0;
148 u_int32_t sadb_reserved1;
149 };
150 #endif
151
152 /** buffer size for PF_KEY messages */
153 #define PFKEY_BUFFER_SIZE 4096
154
155 /** PF_KEY messages are 64 bit aligned */
156 #define PFKEY_ALIGNMENT 8
157 /** aligns len to 64 bits */
158 #define PFKEY_ALIGN(len) (((len) + PFKEY_ALIGNMENT - 1) & ~(PFKEY_ALIGNMENT - 1))
159 /** calculates the properly padded length in 64 bit chunks */
160 #define PFKEY_LEN(len) ((PFKEY_ALIGN(len) / PFKEY_ALIGNMENT))
161 /** calculates user mode length i.e. in bytes */
162 #define PFKEY_USER_LEN(len) ((len) * PFKEY_ALIGNMENT)
163
164 /** given a PF_KEY message header and an extension this updates the length in the header */
165 #define PFKEY_EXT_ADD(msg, ext) ((msg)->sadb_msg_len += ((struct sadb_ext*)ext)->sadb_ext_len)
166 /** given a PF_KEY message header this returns a pointer to the next extension */
167 #define PFKEY_EXT_ADD_NEXT(msg) ((struct sadb_ext*)(((char*)(msg)) + PFKEY_USER_LEN((msg)->sadb_msg_len)))
168 /** copy an extension and append it to a PF_KEY message */
169 #define PFKEY_EXT_COPY(msg, ext) (PFKEY_EXT_ADD(msg, memcpy(PFKEY_EXT_ADD_NEXT(msg), ext, PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len))))
170 /** given a PF_KEY extension this returns a pointer to the next extension */
171 #define PFKEY_EXT_NEXT(ext) ((struct sadb_ext*)(((char*)(ext)) + PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len)))
172 /** given a PF_KEY extension this returns a pointer to the next extension also updates len (len in 64 bit words) */
173 #define PFKEY_EXT_NEXT_LEN(ext,len) ((len) -= (ext)->sadb_ext_len, PFKEY_EXT_NEXT(ext))
174 /** true if ext has a valid length and len is large enough to contain ext (assuming len in 64 bit words) */
175 #define PFKEY_EXT_OK(ext,len) ((len) >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
176 (ext)->sadb_ext_len >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
177 (ext)->sadb_ext_len <= (len))
178
179 typedef struct private_kernel_pfkey_ipsec_t private_kernel_pfkey_ipsec_t;
180
181 /**
182 * Private variables and functions of kernel_pfkey class.
183 */
184 struct private_kernel_pfkey_ipsec_t
185 {
186 /**
187 * Public part of the kernel_pfkey_t object.
188 */
189 kernel_pfkey_ipsec_t public;
190
191 /**
192 * mutex to lock access to various lists
193 */
194 mutex_t *mutex;
195
196 /**
197 * List of installed policies (policy_entry_t)
198 */
199 linked_list_t *policies;
200
201 /**
202 * List of exclude routes (exclude_route_t)
203 */
204 linked_list_t *excludes;
205
206 /**
207 * Hash table of IPsec SAs using policies (ipsec_sa_t)
208 */
209 hashtable_t *sas;
210
211 /**
212 * whether to install routes along policies
213 */
214 bool install_routes;
215
216 /**
217 * mutex to lock access to the PF_KEY socket
218 */
219 mutex_t *mutex_pfkey;
220
221 /**
222 * PF_KEY socket to communicate with the kernel
223 */
224 int socket;
225
226 /**
227 * PF_KEY socket to receive acquire and expire events
228 */
229 int socket_events;
230
231 /**
232 * sequence number for messages sent to the kernel
233 */
234 int seq;
235 };
236
237 typedef struct exclude_route_t exclude_route_t;
238
239 /**
240 * Exclude route definition
241 */
242 struct exclude_route_t {
243 /** destination address of exclude */
244 host_t *dst;
245 /** source address for route */
246 host_t *src;
247 /** nexthop exclude has been installed */
248 host_t *gtw;
249 /** references to this route */
250 int refs;
251 };
252
253 /**
254 * clean up a route exclude entry
255 */
256 static void exclude_route_destroy(exclude_route_t *this)
257 {
258 this->dst->destroy(this->dst);
259 this->src->destroy(this->src);
260 this->gtw->destroy(this->gtw);
261 free(this);
262 }
263
264 typedef struct route_entry_t route_entry_t;
265
266 /**
267 * installed routing entry
268 */
269 struct route_entry_t {
270 /** name of the interface the route is bound to */
271 char *if_name;
272
273 /** source ip of the route */
274 host_t *src_ip;
275
276 /** gateway for this route */
277 host_t *gateway;
278
279 /** destination net */
280 chunk_t dst_net;
281
282 /** destination net prefixlen */
283 u_int8_t prefixlen;
284
285 /** reference to exclude route, if any */
286 exclude_route_t *exclude;
287 };
288
289 /**
290 * destroy an route_entry_t object
291 */
292 static void route_entry_destroy(route_entry_t *this)
293 {
294 free(this->if_name);
295 DESTROY_IF(this->src_ip);
296 DESTROY_IF(this->gateway);
297 chunk_free(&this->dst_net);
298 free(this);
299 }
300
301 /**
302 * compare two route_entry_t objects
303 */
304 static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
305 {
306 return a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
307 a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
308 a->gateway && b->gateway &&
309 a->gateway->ip_equals(a->gateway, b->gateway) &&
310 chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen;
311 }
312
313 typedef struct ipsec_sa_t ipsec_sa_t;
314
315 /**
316 * IPsec SA assigned to a policy.
317 */
318 struct ipsec_sa_t {
319 /** Source address of this SA */
320 host_t *src;
321
322 /** Destination address of this SA */
323 host_t *dst;
324
325 /** Description of this SA */
326 ipsec_sa_cfg_t cfg;
327
328 /** Reference count for this SA */
329 refcount_t refcount;
330 };
331
332 /**
333 * Hash function for ipsec_sa_t objects
334 */
335 static u_int ipsec_sa_hash(ipsec_sa_t *sa)
336 {
337 return chunk_hash_inc(sa->src->get_address(sa->src),
338 chunk_hash_inc(sa->dst->get_address(sa->dst),
339 chunk_hash(chunk_from_thing(sa->cfg))));
340 }
341
342 /**
343 * Equality function for ipsec_sa_t objects
344 */
345 static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa)
346 {
347 return sa->src->ip_equals(sa->src, other_sa->src) &&
348 sa->dst->ip_equals(sa->dst, other_sa->dst) &&
349 memeq(&sa->cfg, &other_sa->cfg, sizeof(ipsec_sa_cfg_t));
350 }
351
352 /**
353 * Allocate or reference an IPsec SA object
354 */
355 static ipsec_sa_t *ipsec_sa_create(private_kernel_pfkey_ipsec_t *this,
356 host_t *src, host_t *dst,
357 ipsec_sa_cfg_t *cfg)
358 {
359 ipsec_sa_t *sa, *found;
360 INIT(sa,
361 .src = src,
362 .dst = dst,
363 .cfg = *cfg,
364 );
365 found = this->sas->get(this->sas, sa);
366 if (!found)
367 {
368 sa->src = src->clone(src);
369 sa->dst = dst->clone(dst);
370 this->sas->put(this->sas, sa, sa);
371 }
372 else
373 {
374 free(sa);
375 sa = found;
376 }
377 ref_get(&sa->refcount);
378 return sa;
379 }
380
381 /**
382 * Release and destroy an IPsec SA object
383 */
384 static void ipsec_sa_destroy(private_kernel_pfkey_ipsec_t *this,
385 ipsec_sa_t *sa)
386 {
387 if (ref_put(&sa->refcount))
388 {
389 this->sas->remove(this->sas, sa);
390 DESTROY_IF(sa->src);
391 DESTROY_IF(sa->dst);
392 free(sa);
393 }
394 }
395
396 typedef struct policy_sa_t policy_sa_t;
397 typedef struct policy_sa_in_t policy_sa_in_t;
398
399 /**
400 * Mapping between a policy and an IPsec SA.
401 */
402 struct policy_sa_t {
403 /** Priority assigned to the policy when installed with this SA */
404 u_int32_t priority;
405
406 /** Type of the policy */
407 policy_type_t type;
408
409 /** Assigned SA */
410 ipsec_sa_t *sa;
411 };
412
413 /**
414 * For input policies we also cache the traffic selectors in order to install
415 * the route.
416 */
417 struct policy_sa_in_t {
418 /** Generic interface */
419 policy_sa_t generic;
420
421 /** Source traffic selector of this policy */
422 traffic_selector_t *src_ts;
423
424 /** Destination traffic selector of this policy */
425 traffic_selector_t *dst_ts;
426 };
427
428 /**
429 * Create a policy_sa(_in)_t object
430 */
431 static policy_sa_t *policy_sa_create(private_kernel_pfkey_ipsec_t *this,
432 policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst,
433 traffic_selector_t *src_ts, traffic_selector_t *dst_ts, ipsec_sa_cfg_t *cfg)
434 {
435 policy_sa_t *policy;
436
437 if (dir == POLICY_IN)
438 {
439 policy_sa_in_t *in;
440 INIT(in,
441 .src_ts = src_ts->clone(src_ts),
442 .dst_ts = dst_ts->clone(dst_ts),
443 );
444 policy = &in->generic;
445 }
446 else
447 {
448 INIT(policy, .priority = 0);
449 }
450 policy->type = type;
451 policy->sa = ipsec_sa_create(this, src, dst, cfg);
452 return policy;
453 }
454
455 /**
456 * Destroy a policy_sa(_in)_t object
457 */
458 static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t *dir,
459 private_kernel_pfkey_ipsec_t *this)
460 {
461 if (*dir == POLICY_IN)
462 {
463 policy_sa_in_t *in = (policy_sa_in_t*)policy;
464 in->src_ts->destroy(in->src_ts);
465 in->dst_ts->destroy(in->dst_ts);
466 }
467 ipsec_sa_destroy(this, policy->sa);
468 free(policy);
469 }
470
471 typedef struct policy_entry_t policy_entry_t;
472
473 /**
474 * installed kernel policy.
475 */
476 struct policy_entry_t {
477 /** Index assigned by the kernel */
478 u_int32_t index;
479
480 /** Direction of this policy: in, out, forward */
481 u_int8_t direction;
482
483 /** Parameters of installed policy */
484 struct {
485 /** Subnet and port */
486 host_t *net;
487 /** Subnet mask */
488 u_int8_t mask;
489 /** Protocol */
490 u_int8_t proto;
491 } src, dst;
492
493 /** Associated route installed for this policy */
494 route_entry_t *route;
495
496 /** List of SAs this policy is used by, ordered by priority */
497 linked_list_t *used_by;
498 };
499
500 /**
501 * Create a policy_entry_t object
502 */
503 static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts,
504 traffic_selector_t *dst_ts,
505 policy_dir_t dir)
506 {
507 policy_entry_t *policy;
508 INIT(policy,
509 .direction = dir,
510 );
511
512 src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask);
513 dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask);
514
515 /* src or dest proto may be "any" (0), use more restrictive one */
516 policy->src.proto = max(src_ts->get_protocol(src_ts),
517 dst_ts->get_protocol(dst_ts));
518 policy->src.proto = policy->src.proto ? policy->src.proto : IPSEC_PROTO_ANY;
519 policy->dst.proto = policy->src.proto;
520
521 return policy;
522 }
523
524 /**
525 * Destroy a policy_entry_t object
526 */
527 static void policy_entry_destroy(policy_entry_t *policy,
528 private_kernel_pfkey_ipsec_t *this)
529 {
530 if (policy->route)
531 {
532 route_entry_destroy(policy->route);
533 }
534 if (policy->used_by)
535 {
536 policy->used_by->invoke_function(policy->used_by,
537 (linked_list_invoke_t)policy_sa_destroy,
538 &policy->direction, this);
539 policy->used_by->destroy(policy->used_by);
540 }
541 DESTROY_IF(policy->src.net);
542 DESTROY_IF(policy->dst.net);
543 free(policy);
544 }
545
546 /**
547 * compares two policy_entry_t
548 */
549 static inline bool policy_entry_equals(policy_entry_t *current,
550 policy_entry_t *policy)
551 {
552 return current->direction == policy->direction &&
553 current->src.proto == policy->src.proto &&
554 current->dst.proto == policy->dst.proto &&
555 current->src.mask == policy->src.mask &&
556 current->dst.mask == policy->dst.mask &&
557 current->src.net->equals(current->src.net, policy->src.net) &&
558 current->dst.net->equals(current->dst.net, policy->dst.net);
559 }
560
561 /**
562 * compare the given kernel index with that of a policy
563 */
564 static inline bool policy_entry_match_byindex(policy_entry_t *current,
565 u_int32_t *index)
566 {
567 return current->index == *index;
568 }
569
570 /**
571 * Calculate the priority of a policy
572 */
573 static inline u_int32_t get_priority(policy_entry_t *policy,
574 policy_priority_t prio)
575 {
576 u_int32_t priority = PRIO_BASE;
577 switch (prio)
578 {
579 case POLICY_PRIORITY_FALLBACK:
580 priority <<= 1;
581 /* fall-through */
582 case POLICY_PRIORITY_ROUTED:
583 priority <<= 1;
584 /* fall-through */
585 case POLICY_PRIORITY_DEFAULT:
586 priority <<= 1;
587 /* fall-trough */
588 case POLICY_PRIORITY_PASS:
589 break;
590 }
591 /* calculate priority based on selector size, small size = high prio */
592 priority -= policy->src.mask;
593 priority -= policy->dst.mask;
594 priority <<= 2; /* make some room for the two flags */
595 priority += policy->src.net->get_port(policy->src.net) ||
596 policy->dst.net->get_port(policy->dst.net) ?
597 0 : 2;
598 priority += policy->src.proto != IPSEC_PROTO_ANY ? 0 : 1;
599 return priority;
600 }
601
602 typedef struct pfkey_msg_t pfkey_msg_t;
603
604 struct pfkey_msg_t
605 {
606 /**
607 * PF_KEY message base
608 */
609 struct sadb_msg *msg;
610
611 /**
612 * PF_KEY message extensions
613 */
614 union {
615 struct sadb_ext *ext[SADB_EXT_MAX + 1];
616 struct {
617 struct sadb_ext *reserved; /* SADB_EXT_RESERVED */
618 struct sadb_sa *sa; /* SADB_EXT_SA */
619 struct sadb_lifetime *lft_current; /* SADB_EXT_LIFETIME_CURRENT */
620 struct sadb_lifetime *lft_hard; /* SADB_EXT_LIFETIME_HARD */
621 struct sadb_lifetime *lft_soft; /* SADB_EXT_LIFETIME_SOFT */
622 struct sadb_address *src; /* SADB_EXT_ADDRESS_SRC */
623 struct sadb_address *dst; /* SADB_EXT_ADDRESS_DST */
624 struct sadb_address *proxy; /* SADB_EXT_ADDRESS_PROXY */
625 struct sadb_key *key_auth; /* SADB_EXT_KEY_AUTH */
626 struct sadb_key *key_encr; /* SADB_EXT_KEY_ENCRYPT */
627 struct sadb_ident *id_src; /* SADB_EXT_IDENTITY_SRC */
628 struct sadb_ident *id_dst; /* SADB_EXT_IDENTITY_DST */
629 struct sadb_sens *sensitivity; /* SADB_EXT_SENSITIVITY */
630 struct sadb_prop *proposal; /* SADB_EXT_PROPOSAL */
631 struct sadb_supported *supported_auth; /* SADB_EXT_SUPPORTED_AUTH */
632 struct sadb_supported *supported_encr; /* SADB_EXT_SUPPORTED_ENCRYPT */
633 struct sadb_spirange *spirange; /* SADB_EXT_SPIRANGE */
634 struct sadb_x_kmprivate *x_kmprivate; /* SADB_X_EXT_KMPRIVATE */
635 struct sadb_x_policy *x_policy; /* SADB_X_EXT_POLICY */
636 struct sadb_x_sa2 *x_sa2; /* SADB_X_EXT_SA2 */
637 struct sadb_x_nat_t_type *x_natt_type; /* SADB_X_EXT_NAT_T_TYPE */
638 struct sadb_x_nat_t_port *x_natt_sport; /* SADB_X_EXT_NAT_T_SPORT */
639 struct sadb_x_nat_t_port *x_natt_dport; /* SADB_X_EXT_NAT_T_DPORT */
640 struct sadb_address *x_natt_oa; /* SADB_X_EXT_NAT_T_OA */
641 struct sadb_x_sec_ctx *x_sec_ctx; /* SADB_X_EXT_SEC_CTX */
642 struct sadb_x_kmaddress *x_kmaddress; /* SADB_X_EXT_KMADDRESS */
643 } __attribute__((__packed__));
644 };
645 };
646
647 ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX,
648 "SADB_EXT_RESERVED",
649 "SADB_EXT_SA",
650 "SADB_EXT_LIFETIME_CURRENT",
651 "SADB_EXT_LIFETIME_HARD",
652 "SADB_EXT_LIFETIME_SOFT",
653 "SADB_EXT_ADDRESS_SRC",
654 "SADB_EXT_ADDRESS_DST",
655 "SADB_EXT_ADDRESS_PROXY",
656 "SADB_EXT_KEY_AUTH",
657 "SADB_EXT_KEY_ENCRYPT",
658 "SADB_EXT_IDENTITY_SRC",
659 "SADB_EXT_IDENTITY_DST",
660 "SADB_EXT_SENSITIVITY",
661 "SADB_EXT_PROPOSAL",
662 "SADB_EXT_SUPPORTED_AUTH",
663 "SADB_EXT_SUPPORTED_ENCRYPT",
664 "SADB_EXT_SPIRANGE",
665 "SADB_X_EXT_KMPRIVATE",
666 "SADB_X_EXT_POLICY",
667 "SADB_X_EXT_SA2",
668 "SADB_X_EXT_NAT_T_TYPE",
669 "SADB_X_EXT_NAT_T_SPORT",
670 "SADB_X_EXT_NAT_T_DPORT",
671 "SADB_X_EXT_NAT_T_OA",
672 "SADB_X_EXT_SEC_CTX",
673 "SADB_X_EXT_KMADDRESS"
674 );
675
676 /**
677 * convert a protocol identifier to the PF_KEY sa type
678 */
679 static u_int8_t proto2satype(u_int8_t proto)
680 {
681 switch (proto)
682 {
683 case IPPROTO_ESP:
684 return SADB_SATYPE_ESP;
685 case IPPROTO_AH:
686 return SADB_SATYPE_AH;
687 case IPPROTO_COMP:
688 return SADB_X_SATYPE_IPCOMP;
689 default:
690 return proto;
691 }
692 }
693
694 /**
695 * convert a PF_KEY sa type to a protocol identifier
696 */
697 static u_int8_t satype2proto(u_int8_t satype)
698 {
699 switch (satype)
700 {
701 case SADB_SATYPE_ESP:
702 return IPPROTO_ESP;
703 case SADB_SATYPE_AH:
704 return IPPROTO_AH;
705 case SADB_X_SATYPE_IPCOMP:
706 return IPPROTO_COMP;
707 default:
708 return satype;
709 }
710 }
711
712 /**
713 * convert the general ipsec mode to the one defined in ipsec.h
714 */
715 static u_int8_t mode2kernel(ipsec_mode_t mode)
716 {
717 switch (mode)
718 {
719 case MODE_TRANSPORT:
720 return IPSEC_MODE_TRANSPORT;
721 case MODE_TUNNEL:
722 return IPSEC_MODE_TUNNEL;
723 #ifdef HAVE_IPSEC_MODE_BEET
724 case MODE_BEET:
725 return IPSEC_MODE_BEET;
726 #endif
727 default:
728 return mode;
729 }
730 }
731
732 /**
733 * convert the general policy direction to the one defined in ipsec.h
734 */
735 static u_int8_t dir2kernel(policy_dir_t dir)
736 {
737 switch (dir)
738 {
739 case POLICY_IN:
740 return IPSEC_DIR_INBOUND;
741 case POLICY_OUT:
742 return IPSEC_DIR_OUTBOUND;
743 #ifdef HAVE_IPSEC_DIR_FWD
744 case POLICY_FWD:
745 return IPSEC_DIR_FWD;
746 #endif
747 default:
748 return IPSEC_DIR_INVALID;
749 }
750 }
751
752 /**
753 * convert the policy type to the one defined in ipsec.h
754 */
755 static inline u_int16_t type2kernel(policy_type_t type)
756 {
757 switch (type)
758 {
759 case POLICY_IPSEC:
760 return IPSEC_POLICY_IPSEC;
761 case POLICY_PASS:
762 return IPSEC_POLICY_NONE;
763 case POLICY_DROP:
764 return IPSEC_POLICY_DISCARD;
765 }
766 return type;
767 }
768
769 #ifdef SADB_X_MIGRATE
770 /**
771 * convert the policy direction in ipsec.h to the general one.
772 */
773 static policy_dir_t kernel2dir(u_int8_t dir)
774 {
775 switch (dir)
776 {
777 case IPSEC_DIR_INBOUND:
778 return POLICY_IN;
779 case IPSEC_DIR_OUTBOUND:
780 return POLICY_OUT;
781 #ifdef HAVE_IPSEC_DIR_FWD
782 case IPSEC_DIR_FWD:
783 return POLICY_FWD;
784 #endif
785 default:
786 return dir;
787 }
788 }
789 #endif /*SADB_X_MIGRATE*/
790
791 typedef struct kernel_algorithm_t kernel_algorithm_t;
792
793 /**
794 * Mapping of IKEv2 algorithms to PF_KEY algorithms
795 */
796 struct kernel_algorithm_t {
797 /**
798 * Identifier specified in IKEv2
799 */
800 int ikev2;
801
802 /**
803 * Identifier as defined in pfkeyv2.h
804 */
805 int kernel;
806 };
807
808 #define END_OF_LIST -1
809
810 /**
811 * Algorithms for encryption
812 */
813 static kernel_algorithm_t encryption_algs[] = {
814 /* {ENCR_DES_IV64, 0 }, */
815 {ENCR_DES, SADB_EALG_DESCBC },
816 {ENCR_3DES, SADB_EALG_3DESCBC },
817 /* {ENCR_RC5, 0 }, */
818 /* {ENCR_IDEA, 0 }, */
819 {ENCR_CAST, SADB_X_EALG_CASTCBC },
820 {ENCR_BLOWFISH, SADB_X_EALG_BLOWFISHCBC },
821 /* {ENCR_3IDEA, 0 }, */
822 /* {ENCR_DES_IV32, 0 }, */
823 {ENCR_NULL, SADB_EALG_NULL },
824 {ENCR_AES_CBC, SADB_X_EALG_AESCBC },
825 /* {ENCR_AES_CTR, SADB_X_EALG_AESCTR }, */
826 /* {ENCR_AES_CCM_ICV8, SADB_X_EALG_AES_CCM_ICV8 }, */
827 /* {ENCR_AES_CCM_ICV12, SADB_X_EALG_AES_CCM_ICV12 }, */
828 /* {ENCR_AES_CCM_ICV16, SADB_X_EALG_AES_CCM_ICV16 }, */
829 /* {ENCR_AES_GCM_ICV8, SADB_X_EALG_AES_GCM_ICV8 }, */
830 /* {ENCR_AES_GCM_ICV12, SADB_X_EALG_AES_GCM_ICV12 }, */
831 /* {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM_ICV16 }, */
832 {END_OF_LIST, 0 },
833 };
834
835 /**
836 * Algorithms for integrity protection
837 */
838 static kernel_algorithm_t integrity_algs[] = {
839 {AUTH_HMAC_MD5_96, SADB_AALG_MD5HMAC },
840 {AUTH_HMAC_SHA1_96, SADB_AALG_SHA1HMAC },
841 {AUTH_HMAC_SHA2_256_128, SADB_X_AALG_SHA2_256HMAC },
842 {AUTH_HMAC_SHA2_384_192, SADB_X_AALG_SHA2_384HMAC },
843 {AUTH_HMAC_SHA2_512_256, SADB_X_AALG_SHA2_512HMAC },
844 /* {AUTH_DES_MAC, 0, }, */
845 /* {AUTH_KPDK_MD5, 0, }, */
846 #ifdef SADB_X_AALG_AES_XCBC_MAC
847 {AUTH_AES_XCBC_96, SADB_X_AALG_AES_XCBC_MAC, },
848 #endif
849 {END_OF_LIST, 0, },
850 };
851
852 /**
853 * Algorithms for IPComp, unused yet
854 */
855 static kernel_algorithm_t compression_algs[] = {
856 /* {IPCOMP_OUI, 0 }, */
857 {IPCOMP_DEFLATE, SADB_X_CALG_DEFLATE },
858 #ifdef SADB_X_CALG_LZS
859 {IPCOMP_LZS, SADB_X_CALG_LZS },
860 #endif
861 #ifdef SADB_X_CALG_LZJH
862 {IPCOMP_LZJH, SADB_X_CALG_LZJH },
863 #endif
864 {END_OF_LIST, 0 },
865 };
866
867 /**
868 * Look up a kernel algorithm ID and its key size
869 */
870 static int lookup_algorithm(transform_type_t type, int ikev2)
871 {
872 kernel_algorithm_t *list;
873 u_int16_t alg = 0;
874
875 switch (type)
876 {
877 case ENCRYPTION_ALGORITHM:
878 list = encryption_algs;
879 break;
880 case INTEGRITY_ALGORITHM:
881 list = integrity_algs;
882 break;
883 case COMPRESSION_ALGORITHM:
884 list = compression_algs;
885 break;
886 default:
887 return 0;
888 }
889 while (list->ikev2 != END_OF_LIST)
890 {
891 if (ikev2 == list->ikev2)
892 {
893 return list->kernel;
894 }
895 list++;
896 }
897 hydra->kernel_interface->lookup_algorithm(hydra->kernel_interface, ikev2,
898 type, &alg, NULL);
899 return alg;
900 }
901
902 /**
903 * Helper to set a port in a sockaddr_t, the port has to be in host order
904 */
905 static void set_port(sockaddr_t *addr, u_int16_t port)
906 {
907 switch (addr->sa_family)
908 {
909 case AF_INET:
910 {
911 struct sockaddr_in *sin = (struct sockaddr_in*)addr;
912 sin->sin_port = htons(port);
913 break;
914 }
915 case AF_INET6:
916 {
917 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)addr;
918 sin6->sin6_port = htons(port);
919 break;
920 }
921 }
922 }
923
924 /**
925 * Copy a host_t as sockaddr_t to the given memory location.
926 * @return the number of bytes copied
927 */
928 static size_t hostcpy(void *dest, host_t *host, bool include_port)
929 {
930 sockaddr_t *addr = host->get_sockaddr(host), *dest_addr = dest;
931 socklen_t *len = host->get_sockaddr_len(host);
932
933 memcpy(dest, addr, *len);
934 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
935 dest_addr->sa_len = *len;
936 #endif
937 if (!include_port)
938 {
939 set_port(dest_addr, 0);
940 }
941 return *len;
942 }
943
944 /**
945 * Copy a host_t as sockaddr_t to the given memory location and map the port to
946 * ICMP/ICMPv6 message type/code as the Linux kernel expects it, that is, the
947 * type in the source and the code in the destination address.
948 * @return the number of bytes copied
949 */
950 static size_t hostcpy_icmp(void *dest, host_t *host, u_int16_t type)
951 {
952 size_t len;
953
954 len = hostcpy(dest, host, TRUE);
955 if (type == SADB_EXT_ADDRESS_SRC)
956 {
957 set_port(dest, traffic_selector_icmp_type(host->get_port(host)));
958 }
959 else
960 {
961 set_port(dest, traffic_selector_icmp_code(host->get_port(host)));
962 }
963 return len;
964 }
965
966 /**
967 * add a host to the given sadb_msg
968 */
969 static void add_addr_ext(struct sadb_msg *msg, host_t *host, u_int16_t type,
970 u_int8_t proto, u_int8_t prefixlen, bool include_port)
971 {
972 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
973 size_t len;
974
975 addr->sadb_address_exttype = type;
976 addr->sadb_address_proto = proto;
977 addr->sadb_address_prefixlen = prefixlen;
978 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6)
979 {
980 len = hostcpy_icmp(addr + 1, host, type);
981 }
982 else
983 {
984 len = hostcpy(addr + 1, host, include_port);
985 }
986 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
987 PFKEY_EXT_ADD(msg, addr);
988 }
989
990 /**
991 * adds an empty address extension to the given sadb_msg
992 */
993 static void add_anyaddr_ext(struct sadb_msg *msg, int family, u_int8_t type)
994 {
995 socklen_t len = (family == AF_INET) ? sizeof(struct sockaddr_in) :
996 sizeof(struct sockaddr_in6);
997 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
998 addr->sadb_address_exttype = type;
999 sockaddr_t *saddr = (sockaddr_t*)(addr + 1);
1000 saddr->sa_family = family;
1001 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1002 saddr->sa_len = len;
1003 #endif
1004 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
1005 PFKEY_EXT_ADD(msg, addr);
1006 }
1007
1008 #ifdef HAVE_NATT
1009 /**
1010 * add udp encap extensions to a sadb_msg
1011 */
1012 static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst)
1013 {
1014 struct sadb_x_nat_t_type* nat_type;
1015 struct sadb_x_nat_t_port* nat_port;
1016
1017 nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg);
1018 nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1019 nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(*nat_type));
1020 nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP;
1021 PFKEY_EXT_ADD(msg, nat_type);
1022
1023 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1024 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1025 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1026 nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src));
1027 PFKEY_EXT_ADD(msg, nat_port);
1028
1029 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1030 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1031 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1032 nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst));
1033 PFKEY_EXT_ADD(msg, nat_port);
1034 }
1035 #endif /*HAVE_NATT*/
1036
1037 /**
1038 * Convert a sadb_address to a traffic_selector
1039 */
1040 static traffic_selector_t* sadb_address2ts(struct sadb_address *address)
1041 {
1042 traffic_selector_t *ts;
1043 host_t *host;
1044 u_int8_t proto;
1045
1046 proto = address->sadb_address_proto;
1047 proto = proto == IPSEC_PROTO_ANY ? 0 : proto;
1048
1049 /* The Linux 2.6 kernel does not set the protocol and port information
1050 * in the src and dst sadb_address extensions of the SADB_ACQUIRE message.
1051 */
1052 host = host_create_from_sockaddr((sockaddr_t*)&address[1]);
1053 ts = traffic_selector_create_from_subnet(host,
1054 address->sadb_address_prefixlen,
1055 proto, host->get_port(host),
1056 host->get_port(host) ?: 65535);
1057 return ts;
1058 }
1059
1060 /**
1061 * Parses a pfkey message received from the kernel
1062 */
1063 static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out)
1064 {
1065 struct sadb_ext* ext;
1066 size_t len;
1067
1068 memset(out, 0, sizeof(pfkey_msg_t));
1069 out->msg = msg;
1070
1071 len = msg->sadb_msg_len;
1072 len -= PFKEY_LEN(sizeof(struct sadb_msg));
1073
1074 ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg));
1075
1076 while (len >= PFKEY_LEN(sizeof(struct sadb_ext)))
1077 {
1078 DBG3(DBG_KNL, " %N", sadb_ext_type_names, ext->sadb_ext_type);
1079 if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) ||
1080 ext->sadb_ext_len > len)
1081 {
1082 DBG1(DBG_KNL, "length of %N extension is invalid",
1083 sadb_ext_type_names, ext->sadb_ext_type);
1084 break;
1085 }
1086
1087 if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type))
1088 {
1089 DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid",
1090 ext->sadb_ext_type);
1091 break;
1092 }
1093
1094 if (out->ext[ext->sadb_ext_type])
1095 {
1096 DBG1(DBG_KNL, "duplicate %N extension",
1097 sadb_ext_type_names, ext->sadb_ext_type);
1098 break;
1099 }
1100
1101 out->ext[ext->sadb_ext_type] = ext;
1102 ext = PFKEY_EXT_NEXT_LEN(ext, len);
1103 }
1104
1105 if (len)
1106 {
1107 DBG1(DBG_KNL, "PF_KEY message length is invalid");
1108 return FAILED;
1109 }
1110
1111 return SUCCESS;
1112 }
1113
1114 /**
1115 * Send a message to a specific PF_KEY socket and handle the response.
1116 */
1117 static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket,
1118 struct sadb_msg *in, struct sadb_msg **out, size_t *out_len)
1119 {
1120 unsigned char buf[PFKEY_BUFFER_SIZE];
1121 struct sadb_msg *msg;
1122 int in_len, len;
1123
1124 this->mutex_pfkey->lock(this->mutex_pfkey);
1125
1126 /* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367,
1127 * in particular the behavior in response to an SADB_ACQUIRE. */
1128 in->sadb_msg_seq = ++this->seq;
1129 in->sadb_msg_pid = getpid();
1130
1131 in_len = PFKEY_USER_LEN(in->sadb_msg_len);
1132
1133 while (TRUE)
1134 {
1135 len = send(socket, in, in_len, 0);
1136
1137 if (len != in_len)
1138 {
1139 if (errno == EINTR)
1140 {
1141 /* interrupted, try again */
1142 continue;
1143 }
1144 this->mutex_pfkey->unlock(this->mutex_pfkey);
1145 DBG1(DBG_KNL, "error sending to PF_KEY socket: %s",
1146 strerror(errno));
1147 return FAILED;
1148 }
1149 break;
1150 }
1151
1152 while (TRUE)
1153 {
1154 msg = (struct sadb_msg*)buf;
1155
1156 len = recv(socket, buf, sizeof(buf), 0);
1157
1158 if (len < 0)
1159 {
1160 if (errno == EINTR)
1161 {
1162 DBG1(DBG_KNL, "got interrupted");
1163 /* interrupted, try again */
1164 continue;
1165 }
1166 DBG1(DBG_KNL, "error reading from PF_KEY socket: %s",
1167 strerror(errno));
1168 this->mutex_pfkey->unlock(this->mutex_pfkey);
1169 return FAILED;
1170 }
1171 if (len < sizeof(struct sadb_msg) ||
1172 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1173 {
1174 DBG1(DBG_KNL, "received corrupted PF_KEY message");
1175 this->mutex_pfkey->unlock(this->mutex_pfkey);
1176 return FAILED;
1177 }
1178 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1179 {
1180 DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY "
1181 "message");
1182 this->mutex_pfkey->unlock(this->mutex_pfkey);
1183 return FAILED;
1184 }
1185 if (msg->sadb_msg_pid != in->sadb_msg_pid)
1186 {
1187 DBG2(DBG_KNL, "received PF_KEY message is not intended for us");
1188 continue;
1189 }
1190 if (msg->sadb_msg_seq != this->seq)
1191 {
1192 DBG2(DBG_KNL, "received PF_KEY message with unexpected sequence "
1193 "number, was %d expected %d", msg->sadb_msg_seq,
1194 this->seq);
1195 if (msg->sadb_msg_seq == 0)
1196 {
1197 /* FreeBSD and Mac OS X do this for the response to
1198 * SADB_X_SPDGET (but not for the response to SADB_GET).
1199 * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */
1200 }
1201 else if (msg->sadb_msg_seq < this->seq)
1202 {
1203 continue;
1204 }
1205 else
1206 {
1207 this->mutex_pfkey->unlock(this->mutex_pfkey);
1208 return FAILED;
1209 }
1210 }
1211 if (msg->sadb_msg_type != in->sadb_msg_type)
1212 {
1213 DBG2(DBG_KNL, "received PF_KEY message of wrong type, "
1214 "was %d expected %d, ignoring", msg->sadb_msg_type,
1215 in->sadb_msg_type);
1216 }
1217 break;
1218 }
1219
1220 *out_len = len;
1221 *out = (struct sadb_msg*)malloc(len);
1222 memcpy(*out, buf, len);
1223
1224 this->mutex_pfkey->unlock(this->mutex_pfkey);
1225 return SUCCESS;
1226 }
1227
1228 /**
1229 * Send a message to the default PF_KEY socket and handle the response.
1230 */
1231 static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this,
1232 struct sadb_msg *in, struct sadb_msg **out,
1233 size_t *out_len)
1234 {
1235 return pfkey_send_socket(this, this->socket, in, out, out_len);
1236 }
1237
1238 /**
1239 * Process a SADB_ACQUIRE message from the kernel
1240 */
1241 static void process_acquire(private_kernel_pfkey_ipsec_t *this,
1242 struct sadb_msg* msg)
1243 {
1244 pfkey_msg_t response;
1245 u_int32_t index, reqid = 0;
1246 traffic_selector_t *src_ts, *dst_ts;
1247 policy_entry_t *policy;
1248 policy_sa_t *sa;
1249
1250 switch (msg->sadb_msg_satype)
1251 {
1252 case SADB_SATYPE_UNSPEC:
1253 case SADB_SATYPE_ESP:
1254 case SADB_SATYPE_AH:
1255 break;
1256 default:
1257 /* acquire for AH/ESP only */
1258 return;
1259 }
1260 DBG2(DBG_KNL, "received an SADB_ACQUIRE");
1261
1262 if (parse_pfkey_message(msg, &response) != SUCCESS)
1263 {
1264 DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed");
1265 return;
1266 }
1267
1268 index = response.x_policy->sadb_x_policy_id;
1269 this->mutex->lock(this->mutex);
1270 if (this->policies->find_first(this->policies,
1271 (linked_list_match_t)policy_entry_match_byindex,
1272 (void**)&policy, &index) == SUCCESS &&
1273 policy->used_by->get_first(policy->used_by, (void**)&sa) == SUCCESS)
1274 {
1275 reqid = sa->sa->cfg.reqid;
1276 }
1277 else
1278 {
1279 DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no "
1280 "matching policy found", index);
1281 }
1282 this->mutex->unlock(this->mutex);
1283
1284 src_ts = sadb_address2ts(response.src);
1285 dst_ts = sadb_address2ts(response.dst);
1286
1287 hydra->kernel_interface->acquire(hydra->kernel_interface, reqid, src_ts,
1288 dst_ts);
1289 }
1290
1291 /**
1292 * Process a SADB_EXPIRE message from the kernel
1293 */
1294 static void process_expire(private_kernel_pfkey_ipsec_t *this,
1295 struct sadb_msg* msg)
1296 {
1297 pfkey_msg_t response;
1298 u_int8_t protocol;
1299 u_int32_t spi, reqid;
1300 bool hard;
1301
1302 DBG2(DBG_KNL, "received an SADB_EXPIRE");
1303
1304 if (parse_pfkey_message(msg, &response) != SUCCESS)
1305 {
1306 DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed");
1307 return;
1308 }
1309
1310 protocol = satype2proto(msg->sadb_msg_satype);
1311 spi = response.sa->sadb_sa_spi;
1312 reqid = response.x_sa2->sadb_x_sa2_reqid;
1313 hard = response.lft_hard != NULL;
1314
1315 if (protocol != IPPROTO_ESP && protocol != IPPROTO_AH)
1316 {
1317 DBG2(DBG_KNL, "ignoring SADB_EXPIRE for SA with SPI %.8x and "
1318 "reqid {%u} which is not a CHILD_SA", ntohl(spi), reqid);
1319 return;
1320 }
1321
1322 hydra->kernel_interface->expire(hydra->kernel_interface, reqid, protocol,
1323 spi, hard);
1324 }
1325
1326 #ifdef SADB_X_MIGRATE
1327 /**
1328 * Process a SADB_X_MIGRATE message from the kernel
1329 */
1330 static void process_migrate(private_kernel_pfkey_ipsec_t *this,
1331 struct sadb_msg* msg)
1332 {
1333 pfkey_msg_t response;
1334 traffic_selector_t *src_ts, *dst_ts;
1335 policy_dir_t dir;
1336 u_int32_t reqid = 0;
1337 host_t *local = NULL, *remote = NULL;
1338
1339 DBG2(DBG_KNL, "received an SADB_X_MIGRATE");
1340
1341 if (parse_pfkey_message(msg, &response) != SUCCESS)
1342 {
1343 DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed");
1344 return;
1345 }
1346 src_ts = sadb_address2ts(response.src);
1347 dst_ts = sadb_address2ts(response.dst);
1348 dir = kernel2dir(response.x_policy->sadb_x_policy_dir);
1349 DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts,
1350 policy_dir_names, dir);
1351
1352 /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */
1353 if (response.x_kmaddress)
1354 {
1355 sockaddr_t *local_addr, *remote_addr;
1356 u_int32_t local_len;
1357
1358 local_addr = (sockaddr_t*)&response.x_kmaddress[1];
1359 local = host_create_from_sockaddr(local_addr);
1360 local_len = (local_addr->sa_family == AF_INET6)?
1361 sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
1362 remote_addr = (sockaddr_t*)((u_int8_t*)local_addr + local_len);
1363 remote = host_create_from_sockaddr(remote_addr);
1364 DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
1365 }
1366
1367 if (src_ts && dst_ts && local && remote)
1368 {
1369 hydra->kernel_interface->migrate(hydra->kernel_interface, reqid,
1370 src_ts, dst_ts, dir, local, remote);
1371 }
1372 else
1373 {
1374 DESTROY_IF(src_ts);
1375 DESTROY_IF(dst_ts);
1376 DESTROY_IF(local);
1377 DESTROY_IF(remote);
1378 }
1379 }
1380 #endif /*SADB_X_MIGRATE*/
1381
1382 #ifdef SADB_X_NAT_T_NEW_MAPPING
1383 /**
1384 * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel
1385 */
1386 static void process_mapping(private_kernel_pfkey_ipsec_t *this,
1387 struct sadb_msg* msg)
1388 {
1389 pfkey_msg_t response;
1390 u_int32_t spi, reqid;
1391 sockaddr_t *sa;
1392 host_t *host;
1393
1394 DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING");
1395
1396 if (parse_pfkey_message(msg, &response) != SUCCESS)
1397 {
1398 DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed");
1399 return;
1400 }
1401
1402 if (!response.x_sa2)
1403 {
1404 DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required "
1405 "information");
1406 return;
1407 }
1408
1409 spi = response.sa->sadb_sa_spi;
1410 reqid = response.x_sa2->sadb_x_sa2_reqid;
1411
1412 if (satype2proto(msg->sadb_msg_satype) != IPPROTO_ESP)
1413 {
1414 return;
1415 }
1416
1417 sa = (sockaddr_t*)(response.dst + 1);
1418 switch (sa->sa_family)
1419 {
1420 case AF_INET:
1421 {
1422 struct sockaddr_in *sin = (struct sockaddr_in*)sa;
1423 sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1424 break;
1425 }
1426 case AF_INET6:
1427 {
1428 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
1429 sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1430 break;
1431 }
1432 default:
1433 break;
1434 }
1435
1436 host = host_create_from_sockaddr(sa);
1437 if (host)
1438 {
1439 hydra->kernel_interface->mapping(hydra->kernel_interface, reqid,
1440 spi, host);
1441 }
1442 }
1443 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1444
1445 /**
1446 * Receives events from kernel
1447 */
1448 static bool receive_events(private_kernel_pfkey_ipsec_t *this, int fd,
1449 watcher_event_t event)
1450 {
1451 unsigned char buf[PFKEY_BUFFER_SIZE];
1452 struct sadb_msg *msg = (struct sadb_msg*)buf;
1453 int len;
1454
1455 len = recvfrom(this->socket_events, buf, sizeof(buf), MSG_DONTWAIT, NULL, 0);
1456 if (len < 0)
1457 {
1458 switch (errno)
1459 {
1460 case EINTR:
1461 /* interrupted, try again */
1462 return TRUE;
1463 case EAGAIN:
1464 /* no data ready, select again */
1465 return TRUE;
1466 default:
1467 DBG1(DBG_KNL, "unable to receive from PF_KEY event socket");
1468 sleep(1);
1469 return TRUE;
1470 }
1471 }
1472
1473 if (len < sizeof(struct sadb_msg) ||
1474 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1475 {
1476 DBG2(DBG_KNL, "received corrupted PF_KEY message");
1477 return TRUE;
1478 }
1479 if (msg->sadb_msg_pid != 0)
1480 { /* not from kernel. not interested, try another one */
1481 return TRUE;
1482 }
1483 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1484 {
1485 DBG1(DBG_KNL, "buffer was too small to receive the complete "
1486 "PF_KEY message");
1487 return TRUE;
1488 }
1489
1490 switch (msg->sadb_msg_type)
1491 {
1492 case SADB_ACQUIRE:
1493 process_acquire(this, msg);
1494 break;
1495 case SADB_EXPIRE:
1496 process_expire(this, msg);
1497 break;
1498 #ifdef SADB_X_MIGRATE
1499 case SADB_X_MIGRATE:
1500 process_migrate(this, msg);
1501 break;
1502 #endif /*SADB_X_MIGRATE*/
1503 #ifdef SADB_X_NAT_T_NEW_MAPPING
1504 case SADB_X_NAT_T_NEW_MAPPING:
1505 process_mapping(this, msg);
1506 break;
1507 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1508 default:
1509 break;
1510 }
1511
1512 return TRUE;
1513 }
1514
1515 /**
1516 * Get an SPI for a specific protocol from the kernel.
1517 */
1518
1519 static status_t get_spi_internal(private_kernel_pfkey_ipsec_t *this,
1520 host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
1521 u_int32_t reqid, u_int32_t *spi)
1522 {
1523 unsigned char request[PFKEY_BUFFER_SIZE];
1524 struct sadb_msg *msg, *out;
1525 struct sadb_x_sa2 *sa2;
1526 struct sadb_spirange *range;
1527 pfkey_msg_t response;
1528 u_int32_t received_spi = 0;
1529 size_t len;
1530
1531 memset(&request, 0, sizeof(request));
1532
1533 msg = (struct sadb_msg*)request;
1534 msg->sadb_msg_version = PF_KEY_V2;
1535 msg->sadb_msg_type = SADB_GETSPI;
1536 msg->sadb_msg_satype = proto2satype(proto);
1537 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1538
1539 sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
1540 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1541 sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1542 sa2->sadb_x_sa2_reqid = reqid;
1543 PFKEY_EXT_ADD(msg, sa2);
1544
1545 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1546 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1547
1548 range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg);
1549 range->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
1550 range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1551 range->sadb_spirange_min = min;
1552 range->sadb_spirange_max = max;
1553 PFKEY_EXT_ADD(msg, range);
1554
1555 if (pfkey_send(this, msg, &out, &len) == SUCCESS)
1556 {
1557 if (out->sadb_msg_errno)
1558 {
1559 DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
1560 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1561 }
1562 else if (parse_pfkey_message(out, &response) == SUCCESS)
1563 {
1564 received_spi = response.sa->sadb_sa_spi;
1565 }
1566 free(out);
1567 }
1568
1569 if (received_spi == 0)
1570 {
1571 return FAILED;
1572 }
1573
1574 *spi = received_spi;
1575 return SUCCESS;
1576 }
1577
1578 METHOD(kernel_ipsec_t, get_spi, status_t,
1579 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1580 u_int8_t protocol, u_int32_t reqid, u_int32_t *spi)
1581 {
1582 DBG2(DBG_KNL, "getting SPI for reqid {%u}", reqid);
1583
1584 if (get_spi_internal(this, src, dst, protocol,
1585 0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS)
1586 {
1587 DBG1(DBG_KNL, "unable to get SPI for reqid {%u}", reqid);
1588 return FAILED;
1589 }
1590
1591 DBG2(DBG_KNL, "got SPI %.8x for reqid {%u}", ntohl(*spi), reqid);
1592 return SUCCESS;
1593 }
1594
1595 METHOD(kernel_ipsec_t, get_cpi, status_t,
1596 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1597 u_int32_t reqid, u_int16_t *cpi)
1598 {
1599 u_int32_t received_spi = 0;
1600
1601 DBG2(DBG_KNL, "getting CPI for reqid {%u}", reqid);
1602
1603 if (get_spi_internal(this, src, dst, IPPROTO_COMP,
1604 0x100, 0xEFFF, reqid, &received_spi) != SUCCESS)
1605 {
1606 DBG1(DBG_KNL, "unable to get CPI for reqid {%u}", reqid);
1607 return FAILED;
1608 }
1609
1610 *cpi = htons((u_int16_t)ntohl(received_spi));
1611
1612 DBG2(DBG_KNL, "got CPI %.4x for reqid {%u}", ntohs(*cpi), reqid);
1613 return SUCCESS;
1614 }
1615
1616 METHOD(kernel_ipsec_t, add_sa, status_t,
1617 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, u_int32_t spi,
1618 u_int8_t protocol, u_int32_t reqid, mark_t mark, u_int32_t tfc,
1619 lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
1620 u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
1621 u_int16_t ipcomp, u_int16_t cpi, u_int32_t replay_window,
1622 bool initiator, bool encap, bool esn, bool inbound,
1623 traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
1624 {
1625 unsigned char request[PFKEY_BUFFER_SIZE];
1626 struct sadb_msg *msg, *out;
1627 struct sadb_sa *sa;
1628 struct sadb_x_sa2 *sa2;
1629 struct sadb_lifetime *lft;
1630 struct sadb_key *key;
1631 size_t len;
1632
1633 /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0
1634 * we are in the recursive call below */
1635 if (ipcomp != IPCOMP_NONE && cpi != 0)
1636 {
1637 lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}};
1638 add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, mark,
1639 tfc, &lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED,
1640 chunk_empty, mode, ipcomp, 0, 0, FALSE, FALSE, FALSE, inbound,
1641 NULL, NULL);
1642 ipcomp = IPCOMP_NONE;
1643 /* use transport mode ESP SA, IPComp uses tunnel mode */
1644 mode = MODE_TRANSPORT;
1645 }
1646
1647 memset(&request, 0, sizeof(request));
1648
1649 DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}",
1650 ntohl(spi), reqid);
1651
1652 msg = (struct sadb_msg*)request;
1653 msg->sadb_msg_version = PF_KEY_V2;
1654 msg->sadb_msg_type = inbound ? SADB_UPDATE : SADB_ADD;
1655 msg->sadb_msg_satype = proto2satype(protocol);
1656 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1657
1658 #ifdef __APPLE__
1659 if (encap)
1660 {
1661 struct sadb_sa_2 *sa_2;
1662 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1663 sa_2->sadb_sa_natt_port = dst->get_port(dst);
1664 sa = &sa_2->sa;
1665 sa->sadb_sa_flags |= SADB_X_EXT_NATT;
1666 len = sizeof(struct sadb_sa_2);
1667 }
1668 else
1669 #endif
1670 {
1671 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1672 len = sizeof(struct sadb_sa);
1673 }
1674 sa->sadb_sa_exttype = SADB_EXT_SA;
1675 sa->sadb_sa_len = PFKEY_LEN(len);
1676 sa->sadb_sa_spi = spi;
1677 if (protocol == IPPROTO_COMP)
1678 {
1679 sa->sadb_sa_encrypt = lookup_algorithm(COMPRESSION_ALGORITHM, ipcomp);
1680 }
1681 else
1682 {
1683 sa->sadb_sa_replay = min(replay_window, 32);
1684 sa->sadb_sa_auth = lookup_algorithm(INTEGRITY_ALGORITHM, int_alg);
1685 sa->sadb_sa_encrypt = lookup_algorithm(ENCRYPTION_ALGORITHM, enc_alg);
1686 }
1687 PFKEY_EXT_ADD(msg, sa);
1688
1689 sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
1690 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1691 sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1692 sa2->sadb_x_sa2_mode = mode2kernel(mode);
1693 sa2->sadb_x_sa2_reqid = reqid;
1694 PFKEY_EXT_ADD(msg, sa2);
1695
1696 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1697 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1698
1699 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1700 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1701 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1702 lft->sadb_lifetime_allocations = lifetime->packets.rekey;
1703 lft->sadb_lifetime_bytes = lifetime->bytes.rekey;
1704 lft->sadb_lifetime_addtime = lifetime->time.rekey;
1705 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1706 PFKEY_EXT_ADD(msg, lft);
1707
1708 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1709 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1710 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1711 lft->sadb_lifetime_allocations = lifetime->packets.life;
1712 lft->sadb_lifetime_bytes = lifetime->bytes.life;
1713 lft->sadb_lifetime_addtime = lifetime->time.life;
1714 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1715 PFKEY_EXT_ADD(msg, lft);
1716
1717 if (enc_alg != ENCR_UNDEFINED)
1718 {
1719 if (!sa->sadb_sa_encrypt)
1720 {
1721 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1722 encryption_algorithm_names, enc_alg);
1723 return FAILED;
1724 }
1725 DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
1726 encryption_algorithm_names, enc_alg, enc_key.len * 8);
1727
1728 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1729 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
1730 key->sadb_key_bits = enc_key.len * 8;
1731 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + enc_key.len);
1732 memcpy(key + 1, enc_key.ptr, enc_key.len);
1733
1734 PFKEY_EXT_ADD(msg, key);
1735 }
1736
1737 if (int_alg != AUTH_UNDEFINED)
1738 {
1739 if (!sa->sadb_sa_auth)
1740 {
1741 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1742 integrity_algorithm_names, int_alg);
1743 return FAILED;
1744 }
1745 DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
1746 integrity_algorithm_names, int_alg, int_key.len * 8);
1747
1748 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1749 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
1750 key->sadb_key_bits = int_key.len * 8;
1751 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + int_key.len);
1752 memcpy(key + 1, int_key.ptr, int_key.len);
1753
1754 PFKEY_EXT_ADD(msg, key);
1755 }
1756
1757 #ifdef HAVE_NATT
1758 if (encap)
1759 {
1760 add_encap_ext(msg, src, dst);
1761 }
1762 #endif /*HAVE_NATT*/
1763
1764 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1765 {
1766 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
1767 return FAILED;
1768 }
1769 else if (out->sadb_msg_errno)
1770 {
1771 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)",
1772 ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1773 free(out);
1774 return FAILED;
1775 }
1776
1777 free(out);
1778 return SUCCESS;
1779 }
1780
1781 METHOD(kernel_ipsec_t, update_sa, status_t,
1782 private_kernel_pfkey_ipsec_t *this, u_int32_t spi, u_int8_t protocol,
1783 u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
1784 bool encap, bool new_encap, mark_t mark)
1785 {
1786 unsigned char request[PFKEY_BUFFER_SIZE];
1787 struct sadb_msg *msg, *out;
1788 struct sadb_sa *sa;
1789 pfkey_msg_t response;
1790 size_t len;
1791
1792 /* we can't update the SA if any of the ip addresses have changed.
1793 * that's because we can't use SADB_UPDATE and by deleting and readding the
1794 * SA the sequence numbers would get lost */
1795 if (!src->ip_equals(src, new_src) ||
1796 !dst->ip_equals(dst, new_dst))
1797 {
1798 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address "
1799 "changes are not supported", ntohl(spi));
1800 return NOT_SUPPORTED;
1801 }
1802
1803 /* if IPComp is used, we first update the IPComp SA */
1804 if (cpi)
1805 {
1806 update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0,
1807 src, dst, new_src, new_dst, FALSE, FALSE, mark);
1808 }
1809
1810 memset(&request, 0, sizeof(request));
1811
1812 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1813
1814 msg = (struct sadb_msg*)request;
1815 msg->sadb_msg_version = PF_KEY_V2;
1816 msg->sadb_msg_type = SADB_GET;
1817 msg->sadb_msg_satype = proto2satype(protocol);
1818 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1819
1820 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1821 sa->sadb_sa_exttype = SADB_EXT_SA;
1822 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1823 sa->sadb_sa_spi = spi;
1824 PFKEY_EXT_ADD(msg, sa);
1825
1826 /* the kernel wants a SADB_EXT_ADDRESS_SRC to be present even though
1827 * it is not used for anything. */
1828 add_anyaddr_ext(msg, dst->get_family(dst), SADB_EXT_ADDRESS_SRC);
1829 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1830
1831 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1832 {
1833 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1834 return FAILED;
1835 }
1836 else if (out->sadb_msg_errno)
1837 {
1838 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1839 ntohl(spi), strerror(out->sadb_msg_errno),
1840 out->sadb_msg_errno);
1841 free(out);
1842 return FAILED;
1843 }
1844 else if (parse_pfkey_message(out, &response) != SUCCESS)
1845 {
1846 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing "
1847 "response from kernel failed", ntohl(spi));
1848 free(out);
1849 return FAILED;
1850 }
1851
1852 DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
1853 ntohl(spi), src, dst, new_src, new_dst);
1854
1855 memset(&request, 0, sizeof(request));
1856
1857 msg = (struct sadb_msg*)request;
1858 msg->sadb_msg_version = PF_KEY_V2;
1859 msg->sadb_msg_type = SADB_UPDATE;
1860 msg->sadb_msg_satype = proto2satype(protocol);
1861 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1862
1863 #ifdef __APPLE__
1864 {
1865 struct sadb_sa_2 *sa_2;
1866 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1867 sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2));
1868 memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa));
1869 if (encap)
1870 {
1871 sa_2->sadb_sa_natt_port = new_dst->get_port(new_dst);
1872 sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT;
1873 }
1874 }
1875 #else
1876 PFKEY_EXT_COPY(msg, response.sa);
1877 #endif
1878 PFKEY_EXT_COPY(msg, response.x_sa2);
1879
1880 PFKEY_EXT_COPY(msg, response.src);
1881 PFKEY_EXT_COPY(msg, response.dst);
1882
1883 PFKEY_EXT_COPY(msg, response.lft_soft);
1884 PFKEY_EXT_COPY(msg, response.lft_hard);
1885
1886 if (response.key_encr)
1887 {
1888 PFKEY_EXT_COPY(msg, response.key_encr);
1889 }
1890
1891 if (response.key_auth)
1892 {
1893 PFKEY_EXT_COPY(msg, response.key_auth);
1894 }
1895
1896 #ifdef HAVE_NATT
1897 if (new_encap)
1898 {
1899 add_encap_ext(msg, new_src, new_dst);
1900 }
1901 #endif /*HAVE_NATT*/
1902
1903 free(out);
1904
1905 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1906 {
1907 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
1908 return FAILED;
1909 }
1910 else if (out->sadb_msg_errno)
1911 {
1912 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)",
1913 ntohl(spi), strerror(out->sadb_msg_errno),
1914 out->sadb_msg_errno);
1915 free(out);
1916 return FAILED;
1917 }
1918 free(out);
1919
1920 return SUCCESS;
1921 }
1922
1923 METHOD(kernel_ipsec_t, query_sa, status_t,
1924 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1925 u_int32_t spi, u_int8_t protocol, mark_t mark,
1926 u_int64_t *bytes, u_int64_t *packets, time_t *time)
1927 {
1928 unsigned char request[PFKEY_BUFFER_SIZE];
1929 struct sadb_msg *msg, *out;
1930 struct sadb_sa *sa;
1931 pfkey_msg_t response;
1932 size_t len;
1933
1934 memset(&request, 0, sizeof(request));
1935
1936 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1937
1938 msg = (struct sadb_msg*)request;
1939 msg->sadb_msg_version = PF_KEY_V2;
1940 msg->sadb_msg_type = SADB_GET;
1941 msg->sadb_msg_satype = proto2satype(protocol);
1942 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1943
1944 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1945 sa->sadb_sa_exttype = SADB_EXT_SA;
1946 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1947 sa->sadb_sa_spi = spi;
1948 PFKEY_EXT_ADD(msg, sa);
1949
1950 /* the Linux Kernel doesn't care for the src address, but other systems do
1951 * (e.g. FreeBSD)
1952 */
1953 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1954 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1955
1956 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1957 {
1958 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1959 return FAILED;
1960 }
1961 else if (out->sadb_msg_errno)
1962 {
1963 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1964 ntohl(spi), strerror(out->sadb_msg_errno),
1965 out->sadb_msg_errno);
1966 free(out);
1967 return FAILED;
1968 }
1969 else if (parse_pfkey_message(out, &response) != SUCCESS)
1970 {
1971 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1972 free(out);
1973 return FAILED;
1974 }
1975 if (bytes)
1976 {
1977 *bytes = response.lft_current->sadb_lifetime_bytes;
1978 }
1979 if (packets)
1980 {
1981 /* not supported by PF_KEY */
1982 *packets = 0;
1983 }
1984 if (time)
1985 {
1986 #ifdef __APPLE__
1987 /* OS X uses the "last" time of use in usetime */
1988 *time = response.lft_current->sadb_lifetime_usetime;
1989 #else /* !__APPLE__ */
1990 /* on Linux, sadb_lifetime_usetime is set to the "first" time of use,
1991 * which is actually correct according to PF_KEY. We have to query
1992 * policies for the last usetime. */
1993 *time = 0;
1994 #endif /* !__APPLE__ */
1995 }
1996
1997 free(out);
1998 return SUCCESS;
1999 }
2000
2001 METHOD(kernel_ipsec_t, del_sa, status_t,
2002 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2003 u_int32_t spi, u_int8_t protocol, u_int16_t cpi, mark_t mark)
2004 {
2005 unsigned char request[PFKEY_BUFFER_SIZE];
2006 struct sadb_msg *msg, *out;
2007 struct sadb_sa *sa;
2008 size_t len;
2009
2010 /* if IPComp was used, we first delete the additional IPComp SA */
2011 if (cpi)
2012 {
2013 del_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, 0, mark);
2014 }
2015
2016 memset(&request, 0, sizeof(request));
2017
2018 DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
2019
2020 msg = (struct sadb_msg*)request;
2021 msg->sadb_msg_version = PF_KEY_V2;
2022 msg->sadb_msg_type = SADB_DELETE;
2023 msg->sadb_msg_satype = proto2satype(protocol);
2024 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2025
2026 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
2027 sa->sadb_sa_exttype = SADB_EXT_SA;
2028 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
2029 sa->sadb_sa_spi = spi;
2030 PFKEY_EXT_ADD(msg, sa);
2031
2032 /* the Linux Kernel doesn't care for the src address, but other systems do
2033 * (e.g. FreeBSD)
2034 */
2035 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
2036 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
2037
2038 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2039 {
2040 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
2041 return FAILED;
2042 }
2043 else if (out->sadb_msg_errno)
2044 {
2045 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)",
2046 ntohl(spi), strerror(out->sadb_msg_errno),
2047 out->sadb_msg_errno);
2048 free(out);
2049 return FAILED;
2050 }
2051
2052 DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
2053 free(out);
2054 return SUCCESS;
2055 }
2056
2057 METHOD(kernel_ipsec_t, flush_sas, status_t,
2058 private_kernel_pfkey_ipsec_t *this)
2059 {
2060 unsigned char request[PFKEY_BUFFER_SIZE];
2061 struct sadb_msg *msg, *out;
2062 size_t len;
2063
2064 memset(&request, 0, sizeof(request));
2065
2066 DBG2(DBG_KNL, "flushing all SAD entries");
2067
2068 msg = (struct sadb_msg*)request;
2069 msg->sadb_msg_version = PF_KEY_V2;
2070 msg->sadb_msg_type = SADB_FLUSH;
2071 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2072 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2073
2074 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2075 {
2076 DBG1(DBG_KNL, "unable to flush SAD entries");
2077 return FAILED;
2078 }
2079 else if (out->sadb_msg_errno)
2080 {
2081 DBG1(DBG_KNL, "unable to flush SAD entries: %s (%d)",
2082 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2083 free(out);
2084 return FAILED;
2085 }
2086 free(out);
2087 return SUCCESS;
2088 }
2089
2090 /**
2091 * Add an explicit exclude route to a routing entry
2092 */
2093 static void add_exclude_route(private_kernel_pfkey_ipsec_t *this,
2094 route_entry_t *route, host_t *src, host_t *dst)
2095 {
2096 enumerator_t *enumerator;
2097 exclude_route_t *exclude;
2098 host_t *gtw;
2099
2100 enumerator = this->excludes->create_enumerator(this->excludes);
2101 while (enumerator->enumerate(enumerator, &exclude))
2102 {
2103 if (dst->ip_equals(dst, exclude->dst))
2104 {
2105 route->exclude = exclude;
2106 exclude->refs++;
2107 }
2108 }
2109 enumerator->destroy(enumerator);
2110
2111 if (!route->exclude)
2112 {
2113 DBG2(DBG_KNL, "installing new exclude route for %H src %H", dst, src);
2114 gtw = hydra->kernel_interface->get_nexthop(hydra->kernel_interface,
2115 dst, -1, NULL);
2116 if (gtw)
2117 {
2118 char *if_name = NULL;
2119
2120 if (hydra->kernel_interface->get_interface(
2121 hydra->kernel_interface, src, &if_name) &&
2122 hydra->kernel_interface->add_route(hydra->kernel_interface,
2123 dst->get_address(dst),
2124 dst->get_family(dst) == AF_INET ? 32 : 128,
2125 gtw, src, if_name) == SUCCESS)
2126 {
2127 INIT(exclude,
2128 .dst = dst->clone(dst),
2129 .src = src->clone(src),
2130 .gtw = gtw->clone(gtw),
2131 .refs = 1,
2132 );
2133 route->exclude = exclude;
2134 this->excludes->insert_last(this->excludes, exclude);
2135 }
2136 else
2137 {
2138 DBG1(DBG_KNL, "installing exclude route for %H failed", dst);
2139 }
2140 gtw->destroy(gtw);
2141 free(if_name);
2142 }
2143 else
2144 {
2145 DBG1(DBG_KNL, "gateway lookup for for %H failed", dst);
2146 }
2147 }
2148 }
2149
2150 /**
2151 * Remove an exclude route attached to a routing entry
2152 */
2153 static void remove_exclude_route(private_kernel_pfkey_ipsec_t *this,
2154 route_entry_t *route)
2155 {
2156 if (route->exclude)
2157 {
2158 enumerator_t *enumerator;
2159 exclude_route_t *exclude;
2160 bool removed = FALSE;
2161 host_t *dst;
2162
2163 enumerator = this->excludes->create_enumerator(this->excludes);
2164 while (enumerator->enumerate(enumerator, &exclude))
2165 {
2166 if (route->exclude == exclude)
2167 {
2168 if (--exclude->refs == 0)
2169 {
2170 this->excludes->remove_at(this->excludes, enumerator);
2171 removed = TRUE;
2172 break;
2173 }
2174 }
2175 }
2176 enumerator->destroy(enumerator);
2177
2178 if (removed)
2179 {
2180 char *if_name = NULL;
2181
2182 dst = route->exclude->dst;
2183 DBG2(DBG_KNL, "uninstalling exclude route for %H src %H",
2184 dst, route->exclude->src);
2185 if (hydra->kernel_interface->get_interface(
2186 hydra->kernel_interface,
2187 route->exclude->src, &if_name) &&
2188 hydra->kernel_interface->del_route(hydra->kernel_interface,
2189 dst->get_address(dst),
2190 dst->get_family(dst) == AF_INET ? 32 : 128,
2191 route->exclude->gtw, route->exclude->src,
2192 if_name) != SUCCESS)
2193 {
2194 DBG1(DBG_KNL, "uninstalling exclude route for %H failed", dst);
2195 }
2196 exclude_route_destroy(route->exclude);
2197 free(if_name);
2198 }
2199 route->exclude = NULL;
2200 }
2201 }
2202
2203 /**
2204 * Try to install a route to the given inbound policy
2205 */
2206 static bool install_route(private_kernel_pfkey_ipsec_t *this,
2207 policy_entry_t *policy, policy_sa_in_t *in)
2208 {
2209 route_entry_t *route, *old;
2210 host_t *host, *src, *dst;
2211 bool is_virtual;
2212
2213 if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface,
2214 in->dst_ts, &host, &is_virtual) != SUCCESS)
2215 {
2216 return FALSE;
2217 }
2218
2219 /* switch src/dst, as we handle an IN policy */
2220 src = in->generic.sa->dst;
2221 dst = in->generic.sa->src;
2222
2223 INIT(route,
2224 .prefixlen = policy->src.mask,
2225 .src_ip = host,
2226 .dst_net = chunk_clone(policy->src.net->get_address(policy->src.net)),
2227 );
2228
2229 if (!dst->is_anyaddr(dst))
2230 {
2231 route->gateway = hydra->kernel_interface->get_nexthop(
2232 hydra->kernel_interface, dst, -1, src);
2233 }
2234 else
2235 { /* for shunt policies */
2236 route->gateway = hydra->kernel_interface->get_nexthop(
2237 hydra->kernel_interface, policy->src.net,
2238 policy->src.mask, route->src_ip);
2239 }
2240
2241 /* if the IP is virtual, we install the route over the interface it has
2242 * been installed on. Otherwise we use the interface we use for IKE, as
2243 * this is required for example on Linux. */
2244 if (is_virtual)
2245 {
2246 src = route->src_ip;
2247 }
2248
2249 /* get interface for route, using source address */
2250 if (!hydra->kernel_interface->get_interface(hydra->kernel_interface,
2251 src, &route->if_name))
2252 {
2253 route_entry_destroy(route);
2254 return FALSE;
2255 }
2256
2257 if (policy->route)
2258 {
2259 old = policy->route;
2260
2261 if (route_entry_equals(old, route))
2262 { /* such a route already exists */
2263 route_entry_destroy(route);
2264 return TRUE;
2265 }
2266 /* uninstall previously installed route */
2267 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2268 old->dst_net, old->prefixlen, old->gateway,
2269 old->src_ip, old->if_name) != SUCCESS)
2270 {
2271 DBG1(DBG_KNL, "error uninstalling route installed with policy "
2272 "%R === %R %N", in->src_ts, in->dst_ts,
2273 policy_dir_names, policy->direction);
2274 }
2275 route_entry_destroy(old);
2276 policy->route = NULL;
2277 }
2278
2279 /* if remote traffic selector covers the IKE peer, add an exclude route */
2280 if (hydra->kernel_interface->get_features(
2281 hydra->kernel_interface) & KERNEL_REQUIRE_EXCLUDE_ROUTE)
2282 {
2283 if (in->src_ts->is_host(in->src_ts, dst))
2284 {
2285 DBG1(DBG_KNL, "can't install route for %R === %R %N, conflicts "
2286 "with IKE traffic", in->src_ts, in->dst_ts, policy_dir_names,
2287 policy->direction);
2288 route_entry_destroy(route);
2289 return FALSE;
2290 }
2291 if (in->src_ts->includes(in->src_ts, dst))
2292 {
2293 add_exclude_route(this, route, in->generic.sa->dst, dst);
2294 }
2295 }
2296
2297 DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
2298 in->src_ts, route->gateway, route->src_ip, route->if_name);
2299
2300 switch (hydra->kernel_interface->add_route(hydra->kernel_interface,
2301 route->dst_net, route->prefixlen, route->gateway,
2302 route->src_ip, route->if_name))
2303 {
2304 case ALREADY_DONE:
2305 /* route exists, do not uninstall */
2306 remove_exclude_route(this, route);
2307 route_entry_destroy(route);
2308 return TRUE;
2309 case SUCCESS:
2310 /* cache the installed route */
2311 policy->route = route;
2312 return TRUE;
2313 default:
2314 DBG1(DBG_KNL, "installing route failed: %R via %H src %H dev %s",
2315 in->src_ts, route->gateway, route->src_ip, route->if_name);
2316 remove_exclude_route(this, route);
2317 route_entry_destroy(route);
2318 return FALSE;
2319 }
2320 }
2321
2322 /**
2323 * Add or update a policy in the kernel.
2324 *
2325 * Note: The mutex has to be locked when entering this function.
2326 */
2327 static status_t add_policy_internal(private_kernel_pfkey_ipsec_t *this,
2328 policy_entry_t *policy, policy_sa_t *mapping, bool update)
2329 {
2330 unsigned char request[PFKEY_BUFFER_SIZE];
2331 struct sadb_msg *msg, *out;
2332 struct sadb_x_policy *pol;
2333 struct sadb_x_ipsecrequest *req;
2334 ipsec_sa_t *ipsec = mapping->sa;
2335 pfkey_msg_t response;
2336 size_t len;
2337 ipsec_mode_t proto_mode;
2338
2339 memset(&request, 0, sizeof(request));
2340
2341 msg = (struct sadb_msg*)request;
2342 msg->sadb_msg_version = PF_KEY_V2;
2343 msg->sadb_msg_type = update ? SADB_X_SPDUPDATE : SADB_X_SPDADD;
2344 msg->sadb_msg_satype = 0;
2345 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2346
2347 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2348 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2349 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2350 pol->sadb_x_policy_id = 0;
2351 pol->sadb_x_policy_dir = dir2kernel(policy->direction);
2352 pol->sadb_x_policy_type = type2kernel(mapping->type);
2353 #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
2354 pol->sadb_x_policy_priority = mapping->priority;
2355 #endif
2356
2357 /* one or more sadb_x_ipsecrequest extensions are added to the
2358 * sadb_x_policy extension */
2359 proto_mode = ipsec->cfg.mode;
2360
2361 req = (struct sadb_x_ipsecrequest*)(pol + 1);
2362
2363 if (ipsec->cfg.ipcomp.transform != IPCOMP_NONE)
2364 {
2365 req->sadb_x_ipsecrequest_proto = IPPROTO_COMP;
2366
2367 /* !!! the length here MUST be in octets instead of 64 bit words */
2368 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2369 req->sadb_x_ipsecrequest_mode = mode2kernel(ipsec->cfg.mode);
2370 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2371 req->sadb_x_ipsecrequest_level = (policy->direction == POLICY_OUT) ?
2372 IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_USE;
2373 if (ipsec->cfg.mode == MODE_TUNNEL)
2374 {
2375 len = hostcpy(req + 1, ipsec->src, FALSE);
2376 req->sadb_x_ipsecrequest_len += len;
2377 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2378 req->sadb_x_ipsecrequest_len += len;
2379 /* use transport mode for other SAs */
2380 proto_mode = MODE_TRANSPORT;
2381 }
2382
2383 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2384 req = (struct sadb_x_ipsecrequest*)((char*)(req) +
2385 req->sadb_x_ipsecrequest_len);
2386 }
2387
2388 req->sadb_x_ipsecrequest_proto = ipsec->cfg.esp.use ? IPPROTO_ESP
2389 : IPPROTO_AH;
2390 /* !!! the length here MUST be in octets instead of 64 bit words */
2391 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2392 req->sadb_x_ipsecrequest_mode = mode2kernel(proto_mode);
2393 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2394 req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2395 if (proto_mode == MODE_TUNNEL)
2396 {
2397 len = hostcpy(req + 1, ipsec->src, FALSE);
2398 req->sadb_x_ipsecrequest_len += len;
2399 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2400 req->sadb_x_ipsecrequest_len += len;
2401 }
2402
2403 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2404 PFKEY_EXT_ADD(msg, pol);
2405
2406 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2407 policy->src.mask, TRUE);
2408 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2409 policy->dst.mask, TRUE);
2410
2411 #ifdef __FreeBSD__
2412 { /* on FreeBSD a lifetime has to be defined to be able to later query
2413 * the current use time. */
2414 struct sadb_lifetime *lft;
2415 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
2416 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2417 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
2418 lft->sadb_lifetime_addtime = LONG_MAX;
2419 PFKEY_EXT_ADD(msg, lft);
2420 }
2421 #endif
2422
2423 this->mutex->unlock(this->mutex);
2424
2425 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2426 {
2427 return FAILED;
2428 }
2429 else if (out->sadb_msg_errno)
2430 {
2431 DBG1(DBG_KNL, "unable to %s policy: %s (%d)",
2432 update ? "update" : "add", strerror(out->sadb_msg_errno),
2433 out->sadb_msg_errno);
2434 free(out);
2435 return FAILED;
2436 }
2437 else if (parse_pfkey_message(out, &response) != SUCCESS)
2438 {
2439 DBG1(DBG_KNL, "unable to %s policy: parsing response from kernel "
2440 "failed", update ? "update" : "add");
2441 free(out);
2442 return FAILED;
2443 }
2444
2445 /* we try to find the policy again and update the kernel index */
2446 this->mutex->lock(this->mutex);
2447 if (this->policies->find_first(this->policies, NULL,
2448 (void**)&policy) != SUCCESS)
2449 {
2450 DBG2(DBG_KNL, "unable to update index, the policy is already gone, "
2451 "ignoring");
2452 this->mutex->unlock(this->mutex);
2453 free(out);
2454 return SUCCESS;
2455 }
2456 policy->index = response.x_policy->sadb_x_policy_id;
2457 free(out);
2458
2459 /* install a route, if:
2460 * - this is an inbound policy (to just get one for each child)
2461 * - we are in tunnel mode or install a bypass policy
2462 * - routing is not disabled via strongswan.conf
2463 */
2464 if (policy->direction == POLICY_IN && this->install_routes &&
2465 (mapping->type != POLICY_IPSEC || ipsec->cfg.mode != MODE_TRANSPORT))
2466 {
2467 install_route(this, policy, (policy_sa_in_t*)mapping);
2468 }
2469 this->mutex->unlock(this->mutex);
2470 return SUCCESS;
2471 }
2472
2473 METHOD(kernel_ipsec_t, add_policy, status_t,
2474 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2475 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2476 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2477 mark_t mark, policy_priority_t priority)
2478 {
2479 policy_entry_t *policy, *found = NULL;
2480 policy_sa_t *assigned_sa, *current_sa;
2481 enumerator_t *enumerator;
2482 bool update = TRUE;
2483
2484 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2485 { /* FWD policies are not supported on all platforms */
2486 return SUCCESS;
2487 }
2488
2489 /* create a policy */
2490 policy = create_policy_entry(src_ts, dst_ts, direction);
2491
2492 /* find a matching policy */
2493 this->mutex->lock(this->mutex);
2494 if (this->policies->find_first(this->policies,
2495 (linked_list_match_t)policy_entry_equals,
2496 (void**)&found, policy) == SUCCESS)
2497 { /* use existing policy */
2498 DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
2499 "refcount", src_ts, dst_ts, policy_dir_names, direction);
2500 policy_entry_destroy(policy, this);
2501 policy = found;
2502 }
2503 else
2504 { /* use the new one, if we have no such policy */
2505 this->policies->insert_first(this->policies, policy);
2506 policy->used_by = linked_list_create();
2507 }
2508
2509 /* cache the assigned IPsec SA */
2510 assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
2511 dst_ts, sa);
2512 assigned_sa->priority = get_priority(policy, priority);
2513
2514 /* insert the SA according to its priority */
2515 enumerator = policy->used_by->create_enumerator(policy->used_by);
2516 while (enumerator->enumerate(enumerator, (void**)&current_sa))
2517 {
2518 if (current_sa->priority >= assigned_sa->priority)
2519 {
2520 break;
2521 }
2522 update = FALSE;
2523 }
2524 policy->used_by->insert_before(policy->used_by, enumerator, assigned_sa);
2525 enumerator->destroy(enumerator);
2526
2527 if (!update)
2528 { /* we don't update the policy if the priority is lower than that of the
2529 * currently installed one */
2530 this->mutex->unlock(this->mutex);
2531 return SUCCESS;
2532 }
2533
2534 DBG2(DBG_KNL, "%s policy %R === %R %N",
2535 found ? "updating" : "adding", src_ts, dst_ts,
2536 policy_dir_names, direction);
2537
2538 if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
2539 {
2540 DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
2541 found ? "update" : "add", src_ts, dst_ts,
2542 policy_dir_names, direction);
2543 return FAILED;
2544 }
2545 return SUCCESS;
2546 }
2547
2548 METHOD(kernel_ipsec_t, query_policy, status_t,
2549 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2550 traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
2551 time_t *use_time)
2552 {
2553 unsigned char request[PFKEY_BUFFER_SIZE];
2554 struct sadb_msg *msg, *out;
2555 struct sadb_x_policy *pol;
2556 policy_entry_t *policy, *found = NULL;
2557 pfkey_msg_t response;
2558 size_t len;
2559
2560 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2561 { /* FWD policies are not supported on all platforms */
2562 return NOT_FOUND;
2563 }
2564
2565 DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
2566 policy_dir_names, direction);
2567
2568 /* create a policy */
2569 policy = create_policy_entry(src_ts, dst_ts, direction);
2570
2571 /* find a matching policy */
2572 this->mutex->lock(this->mutex);
2573 if (this->policies->find_first(this->policies,
2574 (linked_list_match_t)policy_entry_equals,
2575 (void**)&found, policy) != SUCCESS)
2576 {
2577 DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", src_ts,
2578 dst_ts, policy_dir_names, direction);
2579 policy_entry_destroy(policy, this);
2580 this->mutex->unlock(this->mutex);
2581 return NOT_FOUND;
2582 }
2583 policy_entry_destroy(policy, this);
2584 policy = found;
2585
2586 memset(&request, 0, sizeof(request));
2587
2588 msg = (struct sadb_msg*)request;
2589 msg->sadb_msg_version = PF_KEY_V2;
2590 msg->sadb_msg_type = SADB_X_SPDGET;
2591 msg->sadb_msg_satype = 0;
2592 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2593
2594 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2595 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2596 pol->sadb_x_policy_id = policy->index;
2597 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2598 pol->sadb_x_policy_dir = dir2kernel(direction);
2599 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2600 PFKEY_EXT_ADD(msg, pol);
2601
2602 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2603 policy->src.mask, TRUE);
2604 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2605 policy->dst.mask, TRUE);
2606
2607 this->mutex->unlock(this->mutex);
2608
2609 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2610 {
2611 DBG1(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
2612 policy_dir_names, direction);
2613 return FAILED;
2614 }
2615 else if (out->sadb_msg_errno)
2616 {
2617 DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", src_ts,
2618 dst_ts, policy_dir_names, direction,
2619 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2620 free(out);
2621 return FAILED;
2622 }
2623 else if (parse_pfkey_message(out, &response) != SUCCESS)
2624 {
2625 DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response "
2626 "from kernel failed", src_ts, dst_ts, policy_dir_names,
2627 direction);
2628 free(out);
2629 return FAILED;
2630 }
2631 else if (response.lft_current == NULL)
2632 {
2633 DBG2(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no "
2634 "use time", src_ts, dst_ts, policy_dir_names, direction);
2635 free(out);
2636 return FAILED;
2637 }
2638
2639 /* we need the monotonic time, but the kernel returns system time. */
2640 if (response.lft_current->sadb_lifetime_usetime)
2641 {
2642 *use_time = time_monotonic(NULL) -
2643 (time(NULL) - response.lft_current->sadb_lifetime_usetime);
2644 }
2645 else
2646 {
2647 *use_time = 0;
2648 }
2649 free(out);
2650 return SUCCESS;
2651 }
2652
2653 METHOD(kernel_ipsec_t, del_policy, status_t,
2654 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2655 traffic_selector_t *dst_ts, policy_dir_t direction, u_int32_t reqid,
2656 mark_t mark, policy_priority_t prio)
2657 {
2658 unsigned char request[PFKEY_BUFFER_SIZE];
2659 struct sadb_msg *msg, *out;
2660 struct sadb_x_policy *pol;
2661 policy_entry_t *policy, *found = NULL;
2662 policy_sa_t *mapping, *to_remove = NULL;
2663 enumerator_t *enumerator;
2664 bool first = TRUE, is_installed = TRUE;
2665 u_int32_t priority;
2666 size_t len;
2667
2668 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2669 { /* FWD policies are not supported on all platforms */
2670 return SUCCESS;
2671 }
2672
2673 DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
2674 policy_dir_names, direction);
2675
2676 /* create a policy */
2677 policy = create_policy_entry(src_ts, dst_ts, direction);
2678
2679 /* find a matching policy */
2680 this->mutex->lock(this->mutex);
2681 if (this->policies->find_first(this->policies,
2682 (linked_list_match_t)policy_entry_equals,
2683 (void**)&found, policy) != SUCCESS)
2684 {
2685 DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
2686 dst_ts, policy_dir_names, direction);
2687 policy_entry_destroy(policy, this);
2688 this->mutex->unlock(this->mutex);
2689 return NOT_FOUND;
2690 }
2691 policy_entry_destroy(policy, this);
2692 policy = found;
2693
2694 /* remove mapping to SA by reqid and priority, if multiple match, which
2695 * could happen when rekeying due to an address change, remove the oldest */
2696 priority = get_priority(policy, prio);
2697 enumerator = policy->used_by->create_enumerator(policy->used_by);
2698 while (enumerator->enumerate(enumerator, (void**)&mapping))
2699 {
2700 if (reqid == mapping->sa->cfg.reqid && priority == mapping->priority)
2701 {
2702 to_remove = mapping;
2703 is_installed = first;
2704 }
2705 else if (priority < mapping->priority)
2706 {
2707 break;
2708 }
2709 first = FALSE;
2710 }
2711 enumerator->destroy(enumerator);
2712 if (!to_remove)
2713 { /* sanity check */
2714 this->mutex->unlock(this->mutex);
2715 return SUCCESS;
2716 }
2717 policy->used_by->remove(policy->used_by, to_remove, NULL);
2718 mapping = to_remove;
2719
2720 if (policy->used_by->get_count(policy->used_by) > 0)
2721 { /* policy is used by more SAs, keep in kernel */
2722 DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
2723 policy_sa_destroy(mapping, &direction, this);
2724
2725 if (!is_installed)
2726 { /* no need to update as the policy was not installed for this SA */
2727 this->mutex->unlock(this->mutex);
2728 return SUCCESS;
2729 }
2730
2731 DBG2(DBG_KNL, "updating policy %R === %R %N", src_ts, dst_ts,
2732 policy_dir_names, direction);
2733 policy->used_by->get_first(policy->used_by, (void**)&mapping);
2734 if (add_policy_internal(this, policy, mapping, TRUE) != SUCCESS)
2735 {
2736 DBG1(DBG_KNL, "unable to update policy %R === %R %N",
2737 src_ts, dst_ts, policy_dir_names, direction);
2738 return FAILED;
2739 }
2740 return SUCCESS;
2741 }
2742
2743 memset(&request, 0, sizeof(request));
2744
2745 msg = (struct sadb_msg*)request;
2746 msg->sadb_msg_version = PF_KEY_V2;
2747 msg->sadb_msg_type = SADB_X_SPDDELETE;
2748 msg->sadb_msg_satype = 0;
2749 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2750
2751 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2752 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2753 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2754 pol->sadb_x_policy_dir = dir2kernel(direction);
2755 pol->sadb_x_policy_type = type2kernel(mapping->type);
2756 PFKEY_EXT_ADD(msg, pol);
2757
2758 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2759 policy->src.mask, TRUE);
2760 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2761 policy->dst.mask, TRUE);
2762
2763 if (policy->route)
2764 {
2765 route_entry_t *route = policy->route;
2766 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2767 route->dst_net, route->prefixlen, route->gateway,
2768 route->src_ip, route->if_name) != SUCCESS)
2769 {
2770 DBG1(DBG_KNL, "error uninstalling route installed with "
2771 "policy %R === %R %N", src_ts, dst_ts,
2772 policy_dir_names, direction);
2773 }
2774 remove_exclude_route(this, route);
2775 }
2776
2777 this->policies->remove(this->policies, found, NULL);
2778 policy_sa_destroy(mapping, &direction, this);
2779 policy_entry_destroy(policy, this);
2780 this->mutex->unlock(this->mutex);
2781
2782 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2783 {
2784 DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
2785 policy_dir_names, direction);
2786 return FAILED;
2787 }
2788 else if (out->sadb_msg_errno)
2789 {
2790 DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", src_ts,
2791 dst_ts, policy_dir_names, direction,
2792 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2793 free(out);
2794 return FAILED;
2795 }
2796 free(out);
2797 return SUCCESS;
2798 }
2799
2800 METHOD(kernel_ipsec_t, flush_policies, status_t,
2801 private_kernel_pfkey_ipsec_t *this)
2802 {
2803 unsigned char request[PFKEY_BUFFER_SIZE];
2804 struct sadb_msg *msg, *out;
2805 size_t len;
2806
2807 memset(&request, 0, sizeof(request));
2808
2809 DBG2(DBG_KNL, "flushing all policies from SPD");
2810
2811 msg = (struct sadb_msg*)request;
2812 msg->sadb_msg_version = PF_KEY_V2;
2813 msg->sadb_msg_type = SADB_X_SPDFLUSH;
2814 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2815 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2816
2817 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2818 {
2819 DBG1(DBG_KNL, "unable to flush SPD entries");
2820 return FAILED;
2821 }
2822 else if (out->sadb_msg_errno)
2823 {
2824 DBG1(DBG_KNL, "unable to flush SPD entries: %s (%d)",
2825 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2826 free(out);
2827 return FAILED;
2828 }
2829 free(out);
2830 return SUCCESS;
2831 }
2832
2833 /**
2834 * Register a socket for ACQUIRE/EXPIRE messages
2835 */
2836 static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this,
2837 u_int8_t satype)
2838 {
2839 unsigned char request[PFKEY_BUFFER_SIZE];
2840 struct sadb_msg *msg, *out;
2841 size_t len;
2842
2843 memset(&request, 0, sizeof(request));
2844
2845 msg = (struct sadb_msg*)request;
2846 msg->sadb_msg_version = PF_KEY_V2;
2847 msg->sadb_msg_type = SADB_REGISTER;
2848 msg->sadb_msg_satype = satype;
2849 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2850
2851 if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS)
2852 {
2853 DBG1(DBG_KNL, "unable to register PF_KEY socket");
2854 return FAILED;
2855 }
2856 else if (out->sadb_msg_errno)
2857 {
2858 DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)",
2859 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2860 free(out);
2861 return FAILED;
2862 }
2863 free(out);
2864 return SUCCESS;
2865 }
2866
2867 METHOD(kernel_ipsec_t, bypass_socket, bool,
2868 private_kernel_pfkey_ipsec_t *this, int fd, int family)
2869 {
2870 struct sadb_x_policy policy;
2871 u_int sol, ipsec_policy;
2872
2873 switch (family)
2874 {
2875 case AF_INET:
2876 {
2877 sol = SOL_IP;
2878 ipsec_policy = IP_IPSEC_POLICY;
2879 break;
2880 }
2881 case AF_INET6:
2882 {
2883 sol = SOL_IPV6;
2884 ipsec_policy = IPV6_IPSEC_POLICY;
2885 break;
2886 }
2887 default:
2888 return FALSE;
2889 }
2890
2891 memset(&policy, 0, sizeof(policy));
2892 policy.sadb_x_policy_len = sizeof(policy) / sizeof(u_int64_t);
2893 policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2894 policy.sadb_x_policy_type = IPSEC_POLICY_BYPASS;
2895
2896 policy.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND;
2897 if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
2898 {
2899 DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
2900 strerror(errno));
2901 return FALSE;
2902 }
2903 policy.sadb_x_policy_dir = IPSEC_DIR_INBOUND;
2904 if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
2905 {
2906 DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
2907 strerror(errno));
2908 return FALSE;
2909 }
2910 return TRUE;
2911 }
2912
2913 METHOD(kernel_ipsec_t, enable_udp_decap, bool,
2914 private_kernel_pfkey_ipsec_t *this, int fd, int family, u_int16_t port)
2915 {
2916 #ifndef __APPLE__
2917 int type = UDP_ENCAP_ESPINUDP;
2918
2919 if (setsockopt(fd, SOL_UDP, UDP_ENCAP, &type, sizeof(type)) < 0)
2920 {
2921 DBG1(DBG_KNL, "unable to set UDP_ENCAP: %s", strerror(errno));
2922 return FALSE;
2923 }
2924 #else /* __APPLE__ */
2925 int intport = port;
2926
2927 if (sysctlbyname("net.inet.ipsec.esp_port", NULL, NULL, &intport,
2928 sizeof(intport)) != 0)
2929 {
2930 DBG1(DBG_KNL, "could not set net.inet.ipsec.esp_port to %d: %s",
2931 port, strerror(errno));
2932 return FALSE;
2933 }
2934 #endif /* __APPLE__ */
2935
2936 return TRUE;
2937 }
2938
2939 METHOD(kernel_ipsec_t, destroy, void,
2940 private_kernel_pfkey_ipsec_t *this)
2941 {
2942 if (this->socket > 0)
2943 {
2944 close(this->socket);
2945 }
2946 if (this->socket_events > 0)
2947 {
2948 lib->watcher->remove(lib->watcher, this->socket_events);
2949 close(this->socket_events);
2950 }
2951 this->policies->invoke_function(this->policies,
2952 (linked_list_invoke_t)policy_entry_destroy,
2953 this);
2954 this->policies->destroy(this->policies);
2955 this->excludes->destroy(this->excludes);
2956 this->sas->destroy(this->sas);
2957 this->mutex->destroy(this->mutex);
2958 this->mutex_pfkey->destroy(this->mutex_pfkey);
2959 free(this);
2960 }
2961
2962 /*
2963 * Described in header.
2964 */
2965 kernel_pfkey_ipsec_t *kernel_pfkey_ipsec_create()
2966 {
2967 private_kernel_pfkey_ipsec_t *this;
2968 bool register_for_events = TRUE;
2969
2970 INIT(this,
2971 .public = {
2972 .interface = {
2973 .get_spi = _get_spi,
2974 .get_cpi = _get_cpi,
2975 .add_sa = _add_sa,
2976 .update_sa = _update_sa,
2977 .query_sa = _query_sa,
2978 .del_sa = _del_sa,
2979 .flush_sas = _flush_sas,
2980 .add_policy = _add_policy,
2981 .query_policy = _query_policy,
2982 .del_policy = _del_policy,
2983 .flush_policies = _flush_policies,
2984 .bypass_socket = _bypass_socket,
2985 .enable_udp_decap = _enable_udp_decap,
2986 .destroy = _destroy,
2987 },
2988 },
2989 .policies = linked_list_create(),
2990 .excludes = linked_list_create(),
2991 .sas = hashtable_create((hashtable_hash_t)ipsec_sa_hash,
2992 (hashtable_equals_t)ipsec_sa_equals, 32),
2993 .mutex = mutex_create(MUTEX_TYPE_DEFAULT),
2994 .mutex_pfkey = mutex_create(MUTEX_TYPE_DEFAULT),
2995 .install_routes = lib->settings->get_bool(lib->settings,
2996 "%s.install_routes", TRUE,
2997 lib->ns),
2998 );
2999
3000 if (streq(lib->ns, "starter"))
3001 { /* starter has no threads, so we do not register for kernel events */
3002 register_for_events = FALSE;
3003 }
3004
3005 /* create a PF_KEY socket to communicate with the kernel */
3006 this->socket = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
3007 if (this->socket <= 0)
3008 {
3009 DBG1(DBG_KNL, "unable to create PF_KEY socket");
3010 destroy(this);
3011 return NULL;
3012 }
3013
3014 if (register_for_events)
3015 {
3016 /* create a PF_KEY socket for ACQUIRE & EXPIRE */
3017 this->socket_events = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
3018 if (this->socket_events <= 0)
3019 {
3020 DBG1(DBG_KNL, "unable to create PF_KEY event socket");
3021 destroy(this);
3022 return NULL;
3023 }
3024
3025 /* register the event socket */
3026 if (register_pfkey_socket(this, SADB_SATYPE_ESP) != SUCCESS ||
3027 register_pfkey_socket(this, SADB_SATYPE_AH) != SUCCESS)
3028 {
3029 DBG1(DBG_KNL, "unable to register PF_KEY event socket");
3030 destroy(this);
3031 return NULL;
3032 }
3033
3034 lib->watcher->add(lib->watcher, this->socket_events, WATCHER_READ,
3035 (watcher_cb_t)receive_events, this);
3036 }
3037
3038 return &this->public;
3039 }