c67366b86057eea366f7a900bd59104c1b6b28ab
[strongswan.git] / src / libhydra / plugins / kernel_pfkey / kernel_pfkey_ipsec.c
1 /*
2 * Copyright (C) 2008-2015 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 #if !defined(SADB_X_EALG_AES_GCM_ICV8) && defined(SADB_X_EALG_AESGCM8)
110 #define SADB_X_EALG_AES_GCM_ICV8 SADB_X_EALG_AESGCM8
111 #define SADB_X_EALG_AES_GCM_ICV12 SADB_X_EALG_AESGCM12
112 #define SADB_X_EALG_AES_GCM_ICV16 SADB_X_EALG_AESGCM16
113 #endif
114
115 #ifndef SOL_IP
116 #define SOL_IP IPPROTO_IP
117 #define SOL_IPV6 IPPROTO_IPV6
118 #endif
119
120 /** from linux/in.h */
121 #ifndef IP_IPSEC_POLICY
122 #define IP_IPSEC_POLICY 16
123 #endif
124
125 /** missing on uclibc */
126 #ifndef IPV6_IPSEC_POLICY
127 #define IPV6_IPSEC_POLICY 34
128 #endif
129
130 /* from linux/udp.h */
131 #ifndef UDP_ENCAP
132 #define UDP_ENCAP 100
133 #endif
134
135 #ifndef UDP_ENCAP_ESPINUDP
136 #define UDP_ENCAP_ESPINUDP 2
137 #endif
138
139 /* this is not defined on some platforms */
140 #ifndef SOL_UDP
141 #define SOL_UDP IPPROTO_UDP
142 #endif
143
144 /** base priority for installed policies */
145 #define PRIO_BASE 384
146
147 #ifdef __APPLE__
148 /** from xnu/bsd/net/pfkeyv2.h */
149 #define SADB_X_EXT_NATT 0x002
150 struct sadb_sa_2 {
151 struct sadb_sa sa;
152 u_int16_t sadb_sa_natt_port;
153 u_int16_t sadb_reserved0;
154 u_int32_t sadb_reserved1;
155 };
156 #endif
157
158 /** buffer size for PF_KEY messages */
159 #define PFKEY_BUFFER_SIZE 4096
160
161 /** PF_KEY messages are 64 bit aligned */
162 #define PFKEY_ALIGNMENT 8
163 /** aligns len to 64 bits */
164 #define PFKEY_ALIGN(len) (((len) + PFKEY_ALIGNMENT - 1) & ~(PFKEY_ALIGNMENT - 1))
165 /** calculates the properly padded length in 64 bit chunks */
166 #define PFKEY_LEN(len) ((PFKEY_ALIGN(len) / PFKEY_ALIGNMENT))
167 /** calculates user mode length i.e. in bytes */
168 #define PFKEY_USER_LEN(len) ((len) * PFKEY_ALIGNMENT)
169
170 /** given a PF_KEY message header and an extension this updates the length in the header */
171 #define PFKEY_EXT_ADD(msg, ext) ((msg)->sadb_msg_len += ((struct sadb_ext*)ext)->sadb_ext_len)
172 /** given a PF_KEY message header this returns a pointer to the next extension */
173 #define PFKEY_EXT_ADD_NEXT(msg) ((struct sadb_ext*)(((char*)(msg)) + PFKEY_USER_LEN((msg)->sadb_msg_len)))
174 /** copy an extension and append it to a PF_KEY message */
175 #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))))
176 /** given a PF_KEY extension this returns a pointer to the next extension */
177 #define PFKEY_EXT_NEXT(ext) ((struct sadb_ext*)(((char*)(ext)) + PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len)))
178 /** given a PF_KEY extension this returns a pointer to the next extension also updates len (len in 64 bit words) */
179 #define PFKEY_EXT_NEXT_LEN(ext,len) ((len) -= (ext)->sadb_ext_len, PFKEY_EXT_NEXT(ext))
180 /** true if ext has a valid length and len is large enough to contain ext (assuming len in 64 bit words) */
181 #define PFKEY_EXT_OK(ext,len) ((len) >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
182 (ext)->sadb_ext_len >= PFKEY_LEN(sizeof(struct sadb_ext)) && \
183 (ext)->sadb_ext_len <= (len))
184
185 typedef struct private_kernel_pfkey_ipsec_t private_kernel_pfkey_ipsec_t;
186
187 /**
188 * Private variables and functions of kernel_pfkey class.
189 */
190 struct private_kernel_pfkey_ipsec_t
191 {
192 /**
193 * Public part of the kernel_pfkey_t object.
194 */
195 kernel_pfkey_ipsec_t public;
196
197 /**
198 * mutex to lock access to various lists
199 */
200 mutex_t *mutex;
201
202 /**
203 * List of installed policies (policy_entry_t)
204 */
205 linked_list_t *policies;
206
207 /**
208 * List of exclude routes (exclude_route_t)
209 */
210 linked_list_t *excludes;
211
212 /**
213 * Hash table of IPsec SAs using policies (ipsec_sa_t)
214 */
215 hashtable_t *sas;
216
217 /**
218 * whether to install routes along policies
219 */
220 bool install_routes;
221
222 /**
223 * mutex to lock access to the PF_KEY socket
224 */
225 mutex_t *mutex_pfkey;
226
227 /**
228 * PF_KEY socket to communicate with the kernel
229 */
230 int socket;
231
232 /**
233 * PF_KEY socket to receive acquire and expire events
234 */
235 int socket_events;
236
237 /**
238 * sequence number for messages sent to the kernel
239 */
240 int seq;
241 };
242
243 typedef struct exclude_route_t exclude_route_t;
244
245 /**
246 * Exclude route definition
247 */
248 struct exclude_route_t {
249 /** destination address of exclude */
250 host_t *dst;
251 /** source address for route */
252 host_t *src;
253 /** nexthop exclude has been installed */
254 host_t *gtw;
255 /** references to this route */
256 int refs;
257 };
258
259 /**
260 * clean up a route exclude entry
261 */
262 static void exclude_route_destroy(exclude_route_t *this)
263 {
264 this->dst->destroy(this->dst);
265 this->src->destroy(this->src);
266 this->gtw->destroy(this->gtw);
267 free(this);
268 }
269
270 typedef struct route_entry_t route_entry_t;
271
272 /**
273 * installed routing entry
274 */
275 struct route_entry_t {
276 /** name of the interface the route is bound to */
277 char *if_name;
278
279 /** source ip of the route */
280 host_t *src_ip;
281
282 /** gateway for this route */
283 host_t *gateway;
284
285 /** destination net */
286 chunk_t dst_net;
287
288 /** destination net prefixlen */
289 u_int8_t prefixlen;
290
291 /** reference to exclude route, if any */
292 exclude_route_t *exclude;
293 };
294
295 /**
296 * destroy an route_entry_t object
297 */
298 static void route_entry_destroy(route_entry_t *this)
299 {
300 free(this->if_name);
301 DESTROY_IF(this->src_ip);
302 DESTROY_IF(this->gateway);
303 chunk_free(&this->dst_net);
304 free(this);
305 }
306
307 /**
308 * compare two route_entry_t objects
309 */
310 static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
311 {
312 return a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
313 a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
314 a->gateway && b->gateway &&
315 a->gateway->ip_equals(a->gateway, b->gateway) &&
316 chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen;
317 }
318
319 typedef struct ipsec_sa_t ipsec_sa_t;
320
321 /**
322 * IPsec SA assigned to a policy.
323 */
324 struct ipsec_sa_t {
325 /** Source address of this SA */
326 host_t *src;
327
328 /** Destination address of this SA */
329 host_t *dst;
330
331 /** Description of this SA */
332 ipsec_sa_cfg_t cfg;
333
334 /** Reference count for this SA */
335 refcount_t refcount;
336 };
337
338 /**
339 * Hash function for ipsec_sa_t objects
340 */
341 static u_int ipsec_sa_hash(ipsec_sa_t *sa)
342 {
343 return chunk_hash_inc(sa->src->get_address(sa->src),
344 chunk_hash_inc(sa->dst->get_address(sa->dst),
345 chunk_hash(chunk_from_thing(sa->cfg))));
346 }
347
348 /**
349 * Equality function for ipsec_sa_t objects
350 */
351 static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa)
352 {
353 return sa->src->ip_equals(sa->src, other_sa->src) &&
354 sa->dst->ip_equals(sa->dst, other_sa->dst) &&
355 memeq(&sa->cfg, &other_sa->cfg, sizeof(ipsec_sa_cfg_t));
356 }
357
358 /**
359 * Allocate or reference an IPsec SA object
360 */
361 static ipsec_sa_t *ipsec_sa_create(private_kernel_pfkey_ipsec_t *this,
362 host_t *src, host_t *dst,
363 ipsec_sa_cfg_t *cfg)
364 {
365 ipsec_sa_t *sa, *found;
366 INIT(sa,
367 .src = src,
368 .dst = dst,
369 .cfg = *cfg,
370 );
371 found = this->sas->get(this->sas, sa);
372 if (!found)
373 {
374 sa->src = src->clone(src);
375 sa->dst = dst->clone(dst);
376 this->sas->put(this->sas, sa, sa);
377 }
378 else
379 {
380 free(sa);
381 sa = found;
382 }
383 ref_get(&sa->refcount);
384 return sa;
385 }
386
387 /**
388 * Release and destroy an IPsec SA object
389 */
390 static void ipsec_sa_destroy(private_kernel_pfkey_ipsec_t *this,
391 ipsec_sa_t *sa)
392 {
393 if (ref_put(&sa->refcount))
394 {
395 this->sas->remove(this->sas, sa);
396 DESTROY_IF(sa->src);
397 DESTROY_IF(sa->dst);
398 free(sa);
399 }
400 }
401
402 typedef struct policy_sa_t policy_sa_t;
403 typedef struct policy_sa_in_t policy_sa_in_t;
404
405 /**
406 * Mapping between a policy and an IPsec SA.
407 */
408 struct policy_sa_t {
409 /** Priority assigned to the policy when installed with this SA */
410 u_int32_t priority;
411
412 /** Type of the policy */
413 policy_type_t type;
414
415 /** Assigned SA */
416 ipsec_sa_t *sa;
417 };
418
419 /**
420 * For input policies we also cache the traffic selectors in order to install
421 * the route.
422 */
423 struct policy_sa_in_t {
424 /** Generic interface */
425 policy_sa_t generic;
426
427 /** Source traffic selector of this policy */
428 traffic_selector_t *src_ts;
429
430 /** Destination traffic selector of this policy */
431 traffic_selector_t *dst_ts;
432 };
433
434 /**
435 * Create a policy_sa(_in)_t object
436 */
437 static policy_sa_t *policy_sa_create(private_kernel_pfkey_ipsec_t *this,
438 policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst,
439 traffic_selector_t *src_ts, traffic_selector_t *dst_ts, ipsec_sa_cfg_t *cfg)
440 {
441 policy_sa_t *policy;
442
443 if (dir == POLICY_IN)
444 {
445 policy_sa_in_t *in;
446 INIT(in,
447 .src_ts = src_ts->clone(src_ts),
448 .dst_ts = dst_ts->clone(dst_ts),
449 );
450 policy = &in->generic;
451 }
452 else
453 {
454 INIT(policy, .priority = 0);
455 }
456 policy->type = type;
457 policy->sa = ipsec_sa_create(this, src, dst, cfg);
458 return policy;
459 }
460
461 /**
462 * Destroy a policy_sa(_in)_t object
463 */
464 static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t *dir,
465 private_kernel_pfkey_ipsec_t *this)
466 {
467 if (*dir == POLICY_IN)
468 {
469 policy_sa_in_t *in = (policy_sa_in_t*)policy;
470 in->src_ts->destroy(in->src_ts);
471 in->dst_ts->destroy(in->dst_ts);
472 }
473 ipsec_sa_destroy(this, policy->sa);
474 free(policy);
475 }
476
477 typedef struct policy_entry_t policy_entry_t;
478
479 /**
480 * installed kernel policy.
481 */
482 struct policy_entry_t {
483 /** Index assigned by the kernel */
484 u_int32_t index;
485
486 /** Direction of this policy: in, out, forward */
487 u_int8_t direction;
488
489 /** Parameters of installed policy */
490 struct {
491 /** Subnet and port */
492 host_t *net;
493 /** Subnet mask */
494 u_int8_t mask;
495 /** Protocol */
496 u_int8_t proto;
497 } src, dst;
498
499 /** Associated route installed for this policy */
500 route_entry_t *route;
501
502 /** List of SAs this policy is used by, ordered by priority */
503 linked_list_t *used_by;
504 };
505
506 /**
507 * Create a policy_entry_t object
508 */
509 static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts,
510 traffic_selector_t *dst_ts,
511 policy_dir_t dir)
512 {
513 policy_entry_t *policy;
514 INIT(policy,
515 .direction = dir,
516 );
517 u_int16_t port;
518 u_int8_t proto;
519
520 src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask);
521 dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask);
522
523 /* src or dest proto may be "any" (0), use more restrictive one */
524 proto = max(src_ts->get_protocol(src_ts), dst_ts->get_protocol(dst_ts));
525 /* map the ports to ICMP type/code how the Linux kernel expects them, that
526 * is, type in src, code in dst */
527 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6)
528 {
529 port = max(policy->src.net->get_port(policy->src.net),
530 policy->dst.net->get_port(policy->dst.net));
531 policy->src.net->set_port(policy->src.net,
532 traffic_selector_icmp_type(port));
533 policy->dst.net->set_port(policy->dst.net,
534 traffic_selector_icmp_code(port));
535 }
536 else if (!proto)
537 {
538 proto = IPSEC_PROTO_ANY;
539 }
540 policy->src.proto = policy->dst.proto = proto;
541
542 return policy;
543 }
544
545 /**
546 * Destroy a policy_entry_t object
547 */
548 static void policy_entry_destroy(policy_entry_t *policy,
549 private_kernel_pfkey_ipsec_t *this)
550 {
551 if (policy->route)
552 {
553 route_entry_destroy(policy->route);
554 }
555 if (policy->used_by)
556 {
557 policy->used_by->invoke_function(policy->used_by,
558 (linked_list_invoke_t)policy_sa_destroy,
559 &policy->direction, this);
560 policy->used_by->destroy(policy->used_by);
561 }
562 DESTROY_IF(policy->src.net);
563 DESTROY_IF(policy->dst.net);
564 free(policy);
565 }
566
567 /**
568 * compares two policy_entry_t
569 */
570 static inline bool policy_entry_equals(policy_entry_t *current,
571 policy_entry_t *policy)
572 {
573 return current->direction == policy->direction &&
574 current->src.proto == policy->src.proto &&
575 current->dst.proto == policy->dst.proto &&
576 current->src.mask == policy->src.mask &&
577 current->dst.mask == policy->dst.mask &&
578 current->src.net->equals(current->src.net, policy->src.net) &&
579 current->dst.net->equals(current->dst.net, policy->dst.net);
580 }
581
582 /**
583 * compare the given kernel index with that of a policy
584 */
585 static inline bool policy_entry_match_byindex(policy_entry_t *current,
586 u_int32_t *index)
587 {
588 return current->index == *index;
589 }
590
591 /**
592 * Calculate the priority of a policy
593 */
594 static inline u_int32_t get_priority(policy_entry_t *policy,
595 policy_priority_t prio)
596 {
597 u_int32_t priority = PRIO_BASE;
598 switch (prio)
599 {
600 case POLICY_PRIORITY_FALLBACK:
601 priority <<= 1;
602 /* fall-through */
603 case POLICY_PRIORITY_ROUTED:
604 priority <<= 1;
605 /* fall-through */
606 case POLICY_PRIORITY_DEFAULT:
607 priority <<= 1;
608 /* fall-trough */
609 case POLICY_PRIORITY_PASS:
610 break;
611 }
612 /* calculate priority based on selector size, small size = high prio */
613 priority -= policy->src.mask;
614 priority -= policy->dst.mask;
615 priority <<= 2; /* make some room for the two flags */
616 priority += policy->src.net->get_port(policy->src.net) ||
617 policy->dst.net->get_port(policy->dst.net) ?
618 0 : 2;
619 priority += policy->src.proto != IPSEC_PROTO_ANY ? 0 : 1;
620 return priority;
621 }
622
623 typedef struct pfkey_msg_t pfkey_msg_t;
624
625 struct pfkey_msg_t
626 {
627 /**
628 * PF_KEY message base
629 */
630 struct sadb_msg *msg;
631
632 /**
633 * PF_KEY message extensions
634 */
635 union {
636 struct sadb_ext *ext[SADB_EXT_MAX + 1];
637 struct {
638 struct sadb_ext *reserved; /* SADB_EXT_RESERVED */
639 struct sadb_sa *sa; /* SADB_EXT_SA */
640 struct sadb_lifetime *lft_current; /* SADB_EXT_LIFETIME_CURRENT */
641 struct sadb_lifetime *lft_hard; /* SADB_EXT_LIFETIME_HARD */
642 struct sadb_lifetime *lft_soft; /* SADB_EXT_LIFETIME_SOFT */
643 struct sadb_address *src; /* SADB_EXT_ADDRESS_SRC */
644 struct sadb_address *dst; /* SADB_EXT_ADDRESS_DST */
645 struct sadb_address *proxy; /* SADB_EXT_ADDRESS_PROXY */
646 struct sadb_key *key_auth; /* SADB_EXT_KEY_AUTH */
647 struct sadb_key *key_encr; /* SADB_EXT_KEY_ENCRYPT */
648 struct sadb_ident *id_src; /* SADB_EXT_IDENTITY_SRC */
649 struct sadb_ident *id_dst; /* SADB_EXT_IDENTITY_DST */
650 struct sadb_sens *sensitivity; /* SADB_EXT_SENSITIVITY */
651 struct sadb_prop *proposal; /* SADB_EXT_PROPOSAL */
652 struct sadb_supported *supported_auth; /* SADB_EXT_SUPPORTED_AUTH */
653 struct sadb_supported *supported_encr; /* SADB_EXT_SUPPORTED_ENCRYPT */
654 struct sadb_spirange *spirange; /* SADB_EXT_SPIRANGE */
655 struct sadb_x_kmprivate *x_kmprivate; /* SADB_X_EXT_KMPRIVATE */
656 struct sadb_x_policy *x_policy; /* SADB_X_EXT_POLICY */
657 struct sadb_x_sa2 *x_sa2; /* SADB_X_EXT_SA2 */
658 struct sadb_x_nat_t_type *x_natt_type; /* SADB_X_EXT_NAT_T_TYPE */
659 struct sadb_x_nat_t_port *x_natt_sport; /* SADB_X_EXT_NAT_T_SPORT */
660 struct sadb_x_nat_t_port *x_natt_dport; /* SADB_X_EXT_NAT_T_DPORT */
661 struct sadb_address *x_natt_oa; /* SADB_X_EXT_NAT_T_OA */
662 struct sadb_x_sec_ctx *x_sec_ctx; /* SADB_X_EXT_SEC_CTX */
663 struct sadb_x_kmaddress *x_kmaddress; /* SADB_X_EXT_KMADDRESS */
664 } __attribute__((__packed__));
665 };
666 };
667
668 ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX,
669 "SADB_EXT_RESERVED",
670 "SADB_EXT_SA",
671 "SADB_EXT_LIFETIME_CURRENT",
672 "SADB_EXT_LIFETIME_HARD",
673 "SADB_EXT_LIFETIME_SOFT",
674 "SADB_EXT_ADDRESS_SRC",
675 "SADB_EXT_ADDRESS_DST",
676 "SADB_EXT_ADDRESS_PROXY",
677 "SADB_EXT_KEY_AUTH",
678 "SADB_EXT_KEY_ENCRYPT",
679 "SADB_EXT_IDENTITY_SRC",
680 "SADB_EXT_IDENTITY_DST",
681 "SADB_EXT_SENSITIVITY",
682 "SADB_EXT_PROPOSAL",
683 "SADB_EXT_SUPPORTED_AUTH",
684 "SADB_EXT_SUPPORTED_ENCRYPT",
685 "SADB_EXT_SPIRANGE",
686 "SADB_X_EXT_KMPRIVATE",
687 "SADB_X_EXT_POLICY",
688 "SADB_X_EXT_SA2",
689 "SADB_X_EXT_NAT_T_TYPE",
690 "SADB_X_EXT_NAT_T_SPORT",
691 "SADB_X_EXT_NAT_T_DPORT",
692 "SADB_X_EXT_NAT_T_OA",
693 "SADB_X_EXT_SEC_CTX",
694 "SADB_X_EXT_KMADDRESS"
695 );
696
697 /**
698 * convert a protocol identifier to the PF_KEY sa type
699 */
700 static u_int8_t proto2satype(u_int8_t proto)
701 {
702 switch (proto)
703 {
704 case IPPROTO_ESP:
705 return SADB_SATYPE_ESP;
706 case IPPROTO_AH:
707 return SADB_SATYPE_AH;
708 case IPPROTO_COMP:
709 return SADB_X_SATYPE_IPCOMP;
710 default:
711 return proto;
712 }
713 }
714
715 /**
716 * convert a PF_KEY sa type to a protocol identifier
717 */
718 static u_int8_t satype2proto(u_int8_t satype)
719 {
720 switch (satype)
721 {
722 case SADB_SATYPE_ESP:
723 return IPPROTO_ESP;
724 case SADB_SATYPE_AH:
725 return IPPROTO_AH;
726 case SADB_X_SATYPE_IPCOMP:
727 return IPPROTO_COMP;
728 default:
729 return satype;
730 }
731 }
732
733 /**
734 * convert the general ipsec mode to the one defined in ipsec.h
735 */
736 static u_int8_t mode2kernel(ipsec_mode_t mode)
737 {
738 switch (mode)
739 {
740 case MODE_TRANSPORT:
741 return IPSEC_MODE_TRANSPORT;
742 case MODE_TUNNEL:
743 return IPSEC_MODE_TUNNEL;
744 #ifdef HAVE_IPSEC_MODE_BEET
745 case MODE_BEET:
746 return IPSEC_MODE_BEET;
747 #endif
748 default:
749 return mode;
750 }
751 }
752
753 /**
754 * convert the general policy direction to the one defined in ipsec.h
755 */
756 static u_int8_t dir2kernel(policy_dir_t dir)
757 {
758 switch (dir)
759 {
760 case POLICY_IN:
761 return IPSEC_DIR_INBOUND;
762 case POLICY_OUT:
763 return IPSEC_DIR_OUTBOUND;
764 #ifdef HAVE_IPSEC_DIR_FWD
765 case POLICY_FWD:
766 return IPSEC_DIR_FWD;
767 #endif
768 default:
769 return IPSEC_DIR_INVALID;
770 }
771 }
772
773 /**
774 * convert the policy type to the one defined in ipsec.h
775 */
776 static inline u_int16_t type2kernel(policy_type_t type)
777 {
778 switch (type)
779 {
780 case POLICY_IPSEC:
781 return IPSEC_POLICY_IPSEC;
782 case POLICY_PASS:
783 return IPSEC_POLICY_NONE;
784 case POLICY_DROP:
785 return IPSEC_POLICY_DISCARD;
786 }
787 return type;
788 }
789
790 #ifdef SADB_X_MIGRATE
791 /**
792 * convert the policy direction in ipsec.h to the general one.
793 */
794 static policy_dir_t kernel2dir(u_int8_t dir)
795 {
796 switch (dir)
797 {
798 case IPSEC_DIR_INBOUND:
799 return POLICY_IN;
800 case IPSEC_DIR_OUTBOUND:
801 return POLICY_OUT;
802 #ifdef HAVE_IPSEC_DIR_FWD
803 case IPSEC_DIR_FWD:
804 return POLICY_FWD;
805 #endif
806 default:
807 return dir;
808 }
809 }
810 #endif /*SADB_X_MIGRATE*/
811
812 typedef struct kernel_algorithm_t kernel_algorithm_t;
813
814 /**
815 * Mapping of IKEv2 algorithms to PF_KEY algorithms
816 */
817 struct kernel_algorithm_t {
818 /**
819 * Identifier specified in IKEv2
820 */
821 int ikev2;
822
823 /**
824 * Identifier as defined in pfkeyv2.h
825 */
826 int kernel;
827 };
828
829 #define END_OF_LIST -1
830
831 /**
832 * Algorithms for encryption
833 */
834 static kernel_algorithm_t encryption_algs[] = {
835 /* {ENCR_DES_IV64, 0 }, */
836 {ENCR_DES, SADB_EALG_DESCBC },
837 {ENCR_3DES, SADB_EALG_3DESCBC },
838 /* {ENCR_RC5, 0 }, */
839 /* {ENCR_IDEA, 0 }, */
840 {ENCR_CAST, SADB_X_EALG_CASTCBC },
841 {ENCR_BLOWFISH, SADB_X_EALG_BLOWFISHCBC },
842 /* {ENCR_3IDEA, 0 }, */
843 /* {ENCR_DES_IV32, 0 }, */
844 {ENCR_NULL, SADB_EALG_NULL },
845 {ENCR_AES_CBC, SADB_X_EALG_AESCBC },
846 #ifdef SADB_X_EALG_AESCTR
847 {ENCR_AES_CTR, SADB_X_EALG_AESCTR },
848 #endif
849 /* {ENCR_AES_CCM_ICV8, SADB_X_EALG_AES_CCM_ICV8 }, */
850 /* {ENCR_AES_CCM_ICV12, SADB_X_EALG_AES_CCM_ICV12 }, */
851 /* {ENCR_AES_CCM_ICV16, SADB_X_EALG_AES_CCM_ICV16 }, */
852 #ifdef SADB_X_EALG_AES_GCM_ICV8 /* assume the others are defined too */
853 {ENCR_AES_GCM_ICV8, SADB_X_EALG_AES_GCM_ICV8 },
854 {ENCR_AES_GCM_ICV12, SADB_X_EALG_AES_GCM_ICV12 },
855 {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM_ICV16 },
856 #endif
857 {END_OF_LIST, 0 },
858 };
859
860 /**
861 * Algorithms for integrity protection
862 */
863 static kernel_algorithm_t integrity_algs[] = {
864 {AUTH_HMAC_MD5_96, SADB_AALG_MD5HMAC },
865 {AUTH_HMAC_SHA1_96, SADB_AALG_SHA1HMAC },
866 {AUTH_HMAC_SHA2_256_128, SADB_X_AALG_SHA2_256HMAC },
867 {AUTH_HMAC_SHA2_384_192, SADB_X_AALG_SHA2_384HMAC },
868 {AUTH_HMAC_SHA2_512_256, SADB_X_AALG_SHA2_512HMAC },
869 /* {AUTH_DES_MAC, 0, }, */
870 /* {AUTH_KPDK_MD5, 0, }, */
871 #ifdef SADB_X_AALG_AES_XCBC_MAC
872 {AUTH_AES_XCBC_96, SADB_X_AALG_AES_XCBC_MAC, },
873 #endif
874 {END_OF_LIST, 0, },
875 };
876
877 /**
878 * Algorithms for IPComp, unused yet
879 */
880 static kernel_algorithm_t compression_algs[] = {
881 /* {IPCOMP_OUI, 0 }, */
882 {IPCOMP_DEFLATE, SADB_X_CALG_DEFLATE },
883 #ifdef SADB_X_CALG_LZS
884 {IPCOMP_LZS, SADB_X_CALG_LZS },
885 #endif
886 #ifdef SADB_X_CALG_LZJH
887 {IPCOMP_LZJH, SADB_X_CALG_LZJH },
888 #endif
889 {END_OF_LIST, 0 },
890 };
891
892 /**
893 * Look up a kernel algorithm ID and its key size
894 */
895 static int lookup_algorithm(transform_type_t type, int ikev2)
896 {
897 kernel_algorithm_t *list;
898 u_int16_t alg = 0;
899
900 switch (type)
901 {
902 case ENCRYPTION_ALGORITHM:
903 list = encryption_algs;
904 break;
905 case INTEGRITY_ALGORITHM:
906 list = integrity_algs;
907 break;
908 case COMPRESSION_ALGORITHM:
909 list = compression_algs;
910 break;
911 default:
912 return 0;
913 }
914 while (list->ikev2 != END_OF_LIST)
915 {
916 if (ikev2 == list->ikev2)
917 {
918 return list->kernel;
919 }
920 list++;
921 }
922 hydra->kernel_interface->lookup_algorithm(hydra->kernel_interface, ikev2,
923 type, &alg, NULL);
924 return alg;
925 }
926
927 /**
928 * Helper to set a port in a sockaddr_t, the port has to be in host order
929 */
930 static void set_port(sockaddr_t *addr, u_int16_t port)
931 {
932 switch (addr->sa_family)
933 {
934 case AF_INET:
935 {
936 struct sockaddr_in *sin = (struct sockaddr_in*)addr;
937 sin->sin_port = htons(port);
938 break;
939 }
940 case AF_INET6:
941 {
942 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)addr;
943 sin6->sin6_port = htons(port);
944 break;
945 }
946 }
947 }
948
949 /**
950 * Copy a host_t as sockaddr_t to the given memory location.
951 * @return the number of bytes copied
952 */
953 static size_t hostcpy(void *dest, host_t *host, bool include_port)
954 {
955 sockaddr_t *addr = host->get_sockaddr(host), *dest_addr = dest;
956 socklen_t *len = host->get_sockaddr_len(host);
957
958 memcpy(dest, addr, *len);
959 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
960 dest_addr->sa_len = *len;
961 #endif
962 if (!include_port)
963 {
964 set_port(dest_addr, 0);
965 }
966 return *len;
967 }
968
969 /**
970 * add a host to the given sadb_msg
971 */
972 static void add_addr_ext(struct sadb_msg *msg, host_t *host, u_int16_t type,
973 u_int8_t proto, u_int8_t prefixlen, bool include_port)
974 {
975 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
976 size_t len;
977
978 addr->sadb_address_exttype = type;
979 addr->sadb_address_proto = proto;
980 addr->sadb_address_prefixlen = prefixlen;
981 len = hostcpy(addr + 1, host, include_port);
982 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
983 PFKEY_EXT_ADD(msg, addr);
984 }
985
986 /**
987 * adds an empty address extension to the given sadb_msg
988 */
989 static void add_anyaddr_ext(struct sadb_msg *msg, int family, u_int8_t type)
990 {
991 socklen_t len = (family == AF_INET) ? sizeof(struct sockaddr_in) :
992 sizeof(struct sockaddr_in6);
993 struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
994 addr->sadb_address_exttype = type;
995 sockaddr_t *saddr = (sockaddr_t*)(addr + 1);
996 saddr->sa_family = family;
997 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
998 saddr->sa_len = len;
999 #endif
1000 addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
1001 PFKEY_EXT_ADD(msg, addr);
1002 }
1003
1004 #ifdef HAVE_NATT
1005 /**
1006 * add udp encap extensions to a sadb_msg
1007 */
1008 static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst)
1009 {
1010 struct sadb_x_nat_t_type* nat_type;
1011 struct sadb_x_nat_t_port* nat_port;
1012
1013 nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg);
1014 nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1015 nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(*nat_type));
1016 nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP;
1017 PFKEY_EXT_ADD(msg, nat_type);
1018
1019 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1020 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1021 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1022 nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src));
1023 PFKEY_EXT_ADD(msg, nat_port);
1024
1025 nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1026 nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1027 nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1028 nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst));
1029 PFKEY_EXT_ADD(msg, nat_port);
1030 }
1031 #endif /*HAVE_NATT*/
1032
1033 /**
1034 * Convert a sadb_address to a traffic_selector
1035 */
1036 static traffic_selector_t* sadb_address2ts(struct sadb_address *address)
1037 {
1038 traffic_selector_t *ts;
1039 host_t *host;
1040 u_int8_t proto;
1041
1042 proto = address->sadb_address_proto;
1043 proto = proto == IPSEC_PROTO_ANY ? 0 : proto;
1044
1045 /* The Linux 2.6 kernel does not set the protocol and port information
1046 * in the src and dst sadb_address extensions of the SADB_ACQUIRE message.
1047 */
1048 host = host_create_from_sockaddr((sockaddr_t*)&address[1]);
1049 ts = traffic_selector_create_from_subnet(host,
1050 address->sadb_address_prefixlen,
1051 proto, host->get_port(host),
1052 host->get_port(host) ?: 65535);
1053 return ts;
1054 }
1055
1056 /**
1057 * Parses a pfkey message received from the kernel
1058 */
1059 static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out)
1060 {
1061 struct sadb_ext* ext;
1062 size_t len;
1063
1064 memset(out, 0, sizeof(pfkey_msg_t));
1065 out->msg = msg;
1066
1067 len = msg->sadb_msg_len;
1068 len -= PFKEY_LEN(sizeof(struct sadb_msg));
1069
1070 ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg));
1071
1072 while (len >= PFKEY_LEN(sizeof(struct sadb_ext)))
1073 {
1074 DBG3(DBG_KNL, " %N", sadb_ext_type_names, ext->sadb_ext_type);
1075 if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) ||
1076 ext->sadb_ext_len > len)
1077 {
1078 DBG1(DBG_KNL, "length of %N extension is invalid",
1079 sadb_ext_type_names, ext->sadb_ext_type);
1080 break;
1081 }
1082
1083 if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type))
1084 {
1085 DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid",
1086 ext->sadb_ext_type);
1087 break;
1088 }
1089
1090 if (out->ext[ext->sadb_ext_type])
1091 {
1092 DBG1(DBG_KNL, "duplicate %N extension",
1093 sadb_ext_type_names, ext->sadb_ext_type);
1094 break;
1095 }
1096
1097 out->ext[ext->sadb_ext_type] = ext;
1098 ext = PFKEY_EXT_NEXT_LEN(ext, len);
1099 }
1100
1101 if (len)
1102 {
1103 DBG1(DBG_KNL, "PF_KEY message length is invalid");
1104 return FAILED;
1105 }
1106
1107 return SUCCESS;
1108 }
1109
1110 /**
1111 * Send a message to a specific PF_KEY socket and handle the response.
1112 */
1113 static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket,
1114 struct sadb_msg *in, struct sadb_msg **out, size_t *out_len)
1115 {
1116 unsigned char buf[PFKEY_BUFFER_SIZE];
1117 struct sadb_msg *msg;
1118 int in_len, len;
1119
1120 this->mutex_pfkey->lock(this->mutex_pfkey);
1121
1122 /* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367,
1123 * in particular the behavior in response to an SADB_ACQUIRE. */
1124 in->sadb_msg_seq = ++this->seq;
1125 in->sadb_msg_pid = getpid();
1126
1127 in_len = PFKEY_USER_LEN(in->sadb_msg_len);
1128
1129 while (TRUE)
1130 {
1131 len = send(socket, in, in_len, 0);
1132
1133 if (len != in_len)
1134 {
1135 if (errno == EINTR)
1136 {
1137 /* interrupted, try again */
1138 continue;
1139 }
1140 this->mutex_pfkey->unlock(this->mutex_pfkey);
1141 DBG1(DBG_KNL, "error sending to PF_KEY socket: %s",
1142 strerror(errno));
1143 return FAILED;
1144 }
1145 break;
1146 }
1147
1148 while (TRUE)
1149 {
1150 msg = (struct sadb_msg*)buf;
1151
1152 len = recv(socket, buf, sizeof(buf), 0);
1153
1154 if (len < 0)
1155 {
1156 if (errno == EINTR)
1157 {
1158 DBG1(DBG_KNL, "got interrupted");
1159 /* interrupted, try again */
1160 continue;
1161 }
1162 DBG1(DBG_KNL, "error reading from PF_KEY socket: %s",
1163 strerror(errno));
1164 this->mutex_pfkey->unlock(this->mutex_pfkey);
1165 return FAILED;
1166 }
1167 if (len < sizeof(struct sadb_msg) ||
1168 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1169 {
1170 DBG1(DBG_KNL, "received corrupted PF_KEY message");
1171 this->mutex_pfkey->unlock(this->mutex_pfkey);
1172 return FAILED;
1173 }
1174 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1175 {
1176 DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY "
1177 "message");
1178 this->mutex_pfkey->unlock(this->mutex_pfkey);
1179 return FAILED;
1180 }
1181 if (msg->sadb_msg_pid != in->sadb_msg_pid)
1182 {
1183 DBG2(DBG_KNL, "received PF_KEY message is not intended for us");
1184 continue;
1185 }
1186 if (msg->sadb_msg_seq != this->seq)
1187 {
1188 DBG2(DBG_KNL, "received PF_KEY message with unexpected sequence "
1189 "number, was %d expected %d", msg->sadb_msg_seq,
1190 this->seq);
1191 if (msg->sadb_msg_seq == 0)
1192 {
1193 /* FreeBSD and Mac OS X do this for the response to
1194 * SADB_X_SPDGET (but not for the response to SADB_GET).
1195 * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */
1196 }
1197 else if (msg->sadb_msg_seq < this->seq)
1198 {
1199 continue;
1200 }
1201 else
1202 {
1203 this->mutex_pfkey->unlock(this->mutex_pfkey);
1204 return FAILED;
1205 }
1206 }
1207 if (msg->sadb_msg_type != in->sadb_msg_type)
1208 {
1209 DBG2(DBG_KNL, "received PF_KEY message of wrong type, "
1210 "was %d expected %d, ignoring", msg->sadb_msg_type,
1211 in->sadb_msg_type);
1212 }
1213 break;
1214 }
1215
1216 *out_len = len;
1217 *out = (struct sadb_msg*)malloc(len);
1218 memcpy(*out, buf, len);
1219
1220 this->mutex_pfkey->unlock(this->mutex_pfkey);
1221 return SUCCESS;
1222 }
1223
1224 /**
1225 * Send a message to the default PF_KEY socket and handle the response.
1226 */
1227 static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this,
1228 struct sadb_msg *in, struct sadb_msg **out,
1229 size_t *out_len)
1230 {
1231 return pfkey_send_socket(this, this->socket, in, out, out_len);
1232 }
1233
1234 /**
1235 * Process a SADB_ACQUIRE message from the kernel
1236 */
1237 static void process_acquire(private_kernel_pfkey_ipsec_t *this,
1238 struct sadb_msg* msg)
1239 {
1240 pfkey_msg_t response;
1241 u_int32_t index, reqid = 0;
1242 traffic_selector_t *src_ts, *dst_ts;
1243 policy_entry_t *policy;
1244 policy_sa_t *sa;
1245
1246 switch (msg->sadb_msg_satype)
1247 {
1248 case SADB_SATYPE_UNSPEC:
1249 case SADB_SATYPE_ESP:
1250 case SADB_SATYPE_AH:
1251 break;
1252 default:
1253 /* acquire for AH/ESP only */
1254 return;
1255 }
1256 DBG2(DBG_KNL, "received an SADB_ACQUIRE");
1257
1258 if (parse_pfkey_message(msg, &response) != SUCCESS)
1259 {
1260 DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed");
1261 return;
1262 }
1263
1264 index = response.x_policy->sadb_x_policy_id;
1265 this->mutex->lock(this->mutex);
1266 if (this->policies->find_first(this->policies,
1267 (linked_list_match_t)policy_entry_match_byindex,
1268 (void**)&policy, &index) == SUCCESS &&
1269 policy->used_by->get_first(policy->used_by, (void**)&sa) == SUCCESS)
1270 {
1271 reqid = sa->sa->cfg.reqid;
1272 }
1273 else
1274 {
1275 DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no "
1276 "matching policy found", index);
1277 }
1278 this->mutex->unlock(this->mutex);
1279
1280 src_ts = sadb_address2ts(response.src);
1281 dst_ts = sadb_address2ts(response.dst);
1282
1283 hydra->kernel_interface->acquire(hydra->kernel_interface, reqid, src_ts,
1284 dst_ts);
1285 }
1286
1287 /**
1288 * Process a SADB_EXPIRE message from the kernel
1289 */
1290 static void process_expire(private_kernel_pfkey_ipsec_t *this,
1291 struct sadb_msg* msg)
1292 {
1293 pfkey_msg_t response;
1294 u_int8_t protocol;
1295 u_int32_t spi;
1296 host_t *dst;
1297 bool hard;
1298
1299 DBG2(DBG_KNL, "received an SADB_EXPIRE");
1300
1301 if (parse_pfkey_message(msg, &response) != SUCCESS)
1302 {
1303 DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed");
1304 return;
1305 }
1306
1307 protocol = satype2proto(msg->sadb_msg_satype);
1308 spi = response.sa->sadb_sa_spi;
1309 hard = response.lft_hard != NULL;
1310
1311 if (protocol == IPPROTO_ESP || protocol == IPPROTO_AH)
1312 {
1313 dst = host_create_from_sockaddr((sockaddr_t*)(response.dst + 1));
1314 if (dst)
1315 {
1316 hydra->kernel_interface->expire(hydra->kernel_interface, protocol,
1317 spi, dst, hard);
1318 dst->destroy(dst);
1319 }
1320 }
1321 }
1322
1323 #ifdef SADB_X_MIGRATE
1324 /**
1325 * Process a SADB_X_MIGRATE message from the kernel
1326 */
1327 static void process_migrate(private_kernel_pfkey_ipsec_t *this,
1328 struct sadb_msg* msg)
1329 {
1330 pfkey_msg_t response;
1331 traffic_selector_t *src_ts, *dst_ts;
1332 policy_dir_t dir;
1333 u_int32_t reqid = 0;
1334 host_t *local = NULL, *remote = NULL;
1335
1336 DBG2(DBG_KNL, "received an SADB_X_MIGRATE");
1337
1338 if (parse_pfkey_message(msg, &response) != SUCCESS)
1339 {
1340 DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed");
1341 return;
1342 }
1343 src_ts = sadb_address2ts(response.src);
1344 dst_ts = sadb_address2ts(response.dst);
1345 dir = kernel2dir(response.x_policy->sadb_x_policy_dir);
1346 DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts,
1347 policy_dir_names, dir);
1348
1349 /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */
1350 if (response.x_kmaddress)
1351 {
1352 sockaddr_t *local_addr, *remote_addr;
1353 u_int32_t local_len;
1354
1355 local_addr = (sockaddr_t*)&response.x_kmaddress[1];
1356 local = host_create_from_sockaddr(local_addr);
1357 local_len = (local_addr->sa_family == AF_INET6)?
1358 sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
1359 remote_addr = (sockaddr_t*)((u_int8_t*)local_addr + local_len);
1360 remote = host_create_from_sockaddr(remote_addr);
1361 DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
1362 }
1363
1364 if (src_ts && dst_ts && local && remote)
1365 {
1366 hydra->kernel_interface->migrate(hydra->kernel_interface, reqid,
1367 src_ts, dst_ts, dir, local, remote);
1368 }
1369 else
1370 {
1371 DESTROY_IF(src_ts);
1372 DESTROY_IF(dst_ts);
1373 DESTROY_IF(local);
1374 DESTROY_IF(remote);
1375 }
1376 }
1377 #endif /*SADB_X_MIGRATE*/
1378
1379 #ifdef SADB_X_NAT_T_NEW_MAPPING
1380 /**
1381 * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel
1382 */
1383 static void process_mapping(private_kernel_pfkey_ipsec_t *this,
1384 struct sadb_msg* msg)
1385 {
1386 pfkey_msg_t response;
1387 u_int32_t spi;
1388 sockaddr_t *sa;
1389 host_t *dst, *new;
1390
1391 DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING");
1392
1393 if (parse_pfkey_message(msg, &response) != SUCCESS)
1394 {
1395 DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed");
1396 return;
1397 }
1398
1399 if (!response.x_sa2)
1400 {
1401 DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required "
1402 "information");
1403 return;
1404 }
1405
1406 spi = response.sa->sadb_sa_spi;
1407
1408 if (satype2proto(msg->sadb_msg_satype) != IPPROTO_ESP)
1409 {
1410 return;
1411 }
1412
1413 sa = (sockaddr_t*)(response.dst + 1);
1414 dst = host_create_from_sockaddr(sa);
1415 switch (sa->sa_family)
1416 {
1417 case AF_INET:
1418 {
1419 struct sockaddr_in *sin = (struct sockaddr_in*)sa;
1420 sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1421 break;
1422 }
1423 case AF_INET6:
1424 {
1425 struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
1426 sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1427 break;
1428 }
1429 default:
1430 break;
1431 }
1432 if (dst)
1433 {
1434 new = host_create_from_sockaddr(sa);
1435 if (new)
1436 {
1437 hydra->kernel_interface->mapping(hydra->kernel_interface,
1438 IPPROTO_ESP, spi, dst, new);
1439 new->destroy(new);
1440 }
1441 dst->destroy(dst);
1442 }
1443 }
1444 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1445
1446 /**
1447 * Receives events from kernel
1448 */
1449 static bool receive_events(private_kernel_pfkey_ipsec_t *this, int fd,
1450 watcher_event_t event)
1451 {
1452 unsigned char buf[PFKEY_BUFFER_SIZE];
1453 struct sadb_msg *msg = (struct sadb_msg*)buf;
1454 int len;
1455
1456 len = recvfrom(this->socket_events, buf, sizeof(buf), MSG_DONTWAIT, NULL, 0);
1457 if (len < 0)
1458 {
1459 switch (errno)
1460 {
1461 case EINTR:
1462 /* interrupted, try again */
1463 return TRUE;
1464 case EAGAIN:
1465 /* no data ready, select again */
1466 return TRUE;
1467 default:
1468 DBG1(DBG_KNL, "unable to receive from PF_KEY event socket");
1469 sleep(1);
1470 return TRUE;
1471 }
1472 }
1473
1474 if (len < sizeof(struct sadb_msg) ||
1475 msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1476 {
1477 DBG2(DBG_KNL, "received corrupted PF_KEY message");
1478 return TRUE;
1479 }
1480 if (msg->sadb_msg_pid != 0)
1481 { /* not from kernel. not interested, try another one */
1482 return TRUE;
1483 }
1484 if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1485 {
1486 DBG1(DBG_KNL, "buffer was too small to receive the complete "
1487 "PF_KEY message");
1488 return TRUE;
1489 }
1490
1491 switch (msg->sadb_msg_type)
1492 {
1493 case SADB_ACQUIRE:
1494 process_acquire(this, msg);
1495 break;
1496 case SADB_EXPIRE:
1497 process_expire(this, msg);
1498 break;
1499 #ifdef SADB_X_MIGRATE
1500 case SADB_X_MIGRATE:
1501 process_migrate(this, msg);
1502 break;
1503 #endif /*SADB_X_MIGRATE*/
1504 #ifdef SADB_X_NAT_T_NEW_MAPPING
1505 case SADB_X_NAT_T_NEW_MAPPING:
1506 process_mapping(this, msg);
1507 break;
1508 #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1509 default:
1510 break;
1511 }
1512
1513 return TRUE;
1514 }
1515
1516 /**
1517 * Get an SPI for a specific protocol from the kernel.
1518 */
1519
1520 static status_t get_spi_internal(private_kernel_pfkey_ipsec_t *this,
1521 host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
1522 u_int32_t *spi)
1523 {
1524 unsigned char request[PFKEY_BUFFER_SIZE];
1525 struct sadb_msg *msg, *out;
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 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1540 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1541
1542 range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg);
1543 range->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
1544 range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1545 range->sadb_spirange_min = min;
1546 range->sadb_spirange_max = max;
1547 PFKEY_EXT_ADD(msg, range);
1548
1549 if (pfkey_send(this, msg, &out, &len) == SUCCESS)
1550 {
1551 if (out->sadb_msg_errno)
1552 {
1553 DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
1554 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1555 }
1556 else if (parse_pfkey_message(out, &response) == SUCCESS)
1557 {
1558 received_spi = response.sa->sadb_sa_spi;
1559 }
1560 free(out);
1561 }
1562
1563 if (received_spi == 0)
1564 {
1565 return FAILED;
1566 }
1567
1568 *spi = received_spi;
1569 return SUCCESS;
1570 }
1571
1572 METHOD(kernel_ipsec_t, get_spi, status_t,
1573 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1574 u_int8_t protocol, u_int32_t *spi)
1575 {
1576 if (get_spi_internal(this, src, dst, protocol,
1577 0xc0000000, 0xcFFFFFFF, spi) != SUCCESS)
1578 {
1579 DBG1(DBG_KNL, "unable to get SPI");
1580 return FAILED;
1581 }
1582
1583 DBG2(DBG_KNL, "got SPI %.8x", ntohl(*spi));
1584 return SUCCESS;
1585 }
1586
1587 METHOD(kernel_ipsec_t, get_cpi, status_t,
1588 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1589 u_int16_t *cpi)
1590 {
1591 u_int32_t received_spi = 0;
1592
1593 DBG2(DBG_KNL, "getting CPI");
1594
1595 if (get_spi_internal(this, src, dst, IPPROTO_COMP,
1596 0x100, 0xEFFF, &received_spi) != SUCCESS)
1597 {
1598 DBG1(DBG_KNL, "unable to get CPI");
1599 return FAILED;
1600 }
1601
1602 *cpi = htons((u_int16_t)ntohl(received_spi));
1603
1604 DBG2(DBG_KNL, "got CPI %.4x", ntohs(*cpi));
1605 return SUCCESS;
1606 }
1607
1608 METHOD(kernel_ipsec_t, add_sa, status_t,
1609 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, u_int32_t spi,
1610 u_int8_t protocol, u_int32_t reqid, mark_t mark, u_int32_t tfc,
1611 lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
1612 u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
1613 u_int16_t ipcomp, u_int16_t cpi, u_int32_t replay_window,
1614 bool initiator, bool encap, bool esn, bool inbound, bool update,
1615 linked_list_t *src_ts, linked_list_t *dst_ts)
1616 {
1617 unsigned char request[PFKEY_BUFFER_SIZE];
1618 struct sadb_msg *msg, *out;
1619 struct sadb_sa *sa;
1620 struct sadb_x_sa2 *sa2;
1621 struct sadb_lifetime *lft;
1622 struct sadb_key *key;
1623 size_t len;
1624
1625 /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0
1626 * we are in the recursive call below */
1627 if (ipcomp != IPCOMP_NONE && cpi != 0)
1628 {
1629 lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}};
1630 add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, mark,
1631 tfc, &lft, ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED,
1632 chunk_empty, mode, ipcomp, 0, 0, FALSE, FALSE, FALSE, inbound,
1633 update, NULL, NULL);
1634 ipcomp = IPCOMP_NONE;
1635 /* use transport mode ESP SA, IPComp uses tunnel mode */
1636 mode = MODE_TRANSPORT;
1637 }
1638
1639 if (update)
1640 {
1641 /* As we didn't know the reqid during SPI allocation, we used reqid
1642 * zero. Unfortunately we can't SADB_UPDATE to the new reqid, hence we
1643 * have to delete the SPI allocation state manually. The reqid
1644 * selector does not count for that, therefore we have to delete
1645 * that state before installing the new SA to avoid deleting the
1646 * the new state after installing it. */
1647 mark_t zeromark = {0, 0};
1648
1649 if (this->public.interface.del_sa(&this->public.interface,
1650 src, dst, spi, protocol, 0, zeromark) != SUCCESS)
1651 {
1652 DBG1(DBG_KNL, "deleting SPI allocation SA failed");
1653 }
1654 }
1655
1656 memset(&request, 0, sizeof(request));
1657
1658 DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}",
1659 ntohl(spi), reqid);
1660
1661 msg = (struct sadb_msg*)request;
1662 msg->sadb_msg_version = PF_KEY_V2;
1663 msg->sadb_msg_type = SADB_ADD;
1664 msg->sadb_msg_satype = proto2satype(protocol);
1665 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1666
1667 #ifdef __APPLE__
1668 if (encap)
1669 {
1670 struct sadb_sa_2 *sa_2;
1671 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1672 sa_2->sadb_sa_natt_port = dst->get_port(dst);
1673 sa = &sa_2->sa;
1674 sa->sadb_sa_flags |= SADB_X_EXT_NATT;
1675 len = sizeof(struct sadb_sa_2);
1676 }
1677 else
1678 #endif
1679 {
1680 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1681 len = sizeof(struct sadb_sa);
1682 }
1683 sa->sadb_sa_exttype = SADB_EXT_SA;
1684 sa->sadb_sa_len = PFKEY_LEN(len);
1685 sa->sadb_sa_spi = spi;
1686 if (protocol == IPPROTO_COMP)
1687 {
1688 sa->sadb_sa_encrypt = lookup_algorithm(COMPRESSION_ALGORITHM, ipcomp);
1689 }
1690 else
1691 {
1692 /* Linux interprets sadb_sa_replay as number of packets/bits in the
1693 * replay window, whereas on BSD it's the size of the window in bytes */
1694 #ifdef __linux__
1695 sa->sadb_sa_replay = min(replay_window, 32);
1696 #else
1697 sa->sadb_sa_replay = (replay_window + 7) / 8;
1698 #endif
1699 sa->sadb_sa_auth = lookup_algorithm(INTEGRITY_ALGORITHM, int_alg);
1700 sa->sadb_sa_encrypt = lookup_algorithm(ENCRYPTION_ALGORITHM, enc_alg);
1701 }
1702 PFKEY_EXT_ADD(msg, sa);
1703
1704 sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
1705 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1706 sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1707 sa2->sadb_x_sa2_mode = mode2kernel(mode);
1708 sa2->sadb_x_sa2_reqid = reqid;
1709 PFKEY_EXT_ADD(msg, sa2);
1710
1711 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1712 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1713
1714 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1715 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1716 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1717 lft->sadb_lifetime_allocations = lifetime->packets.rekey;
1718 lft->sadb_lifetime_bytes = lifetime->bytes.rekey;
1719 lft->sadb_lifetime_addtime = lifetime->time.rekey;
1720 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1721 PFKEY_EXT_ADD(msg, lft);
1722
1723 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1724 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1725 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1726 lft->sadb_lifetime_allocations = lifetime->packets.life;
1727 lft->sadb_lifetime_bytes = lifetime->bytes.life;
1728 lft->sadb_lifetime_addtime = lifetime->time.life;
1729 lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1730 PFKEY_EXT_ADD(msg, lft);
1731
1732 if (enc_alg != ENCR_UNDEFINED)
1733 {
1734 if (!sa->sadb_sa_encrypt)
1735 {
1736 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1737 encryption_algorithm_names, enc_alg);
1738 return FAILED;
1739 }
1740 DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
1741 encryption_algorithm_names, enc_alg, enc_key.len * 8);
1742
1743 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1744 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
1745 key->sadb_key_bits = enc_key.len * 8;
1746 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + enc_key.len);
1747 memcpy(key + 1, enc_key.ptr, enc_key.len);
1748
1749 PFKEY_EXT_ADD(msg, key);
1750 }
1751
1752 if (int_alg != AUTH_UNDEFINED)
1753 {
1754 if (!sa->sadb_sa_auth)
1755 {
1756 DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1757 integrity_algorithm_names, int_alg);
1758 return FAILED;
1759 }
1760 DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
1761 integrity_algorithm_names, int_alg, int_key.len * 8);
1762
1763 key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1764 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
1765 key->sadb_key_bits = int_key.len * 8;
1766 key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + int_key.len);
1767 memcpy(key + 1, int_key.ptr, int_key.len);
1768
1769 PFKEY_EXT_ADD(msg, key);
1770 }
1771
1772 #ifdef HAVE_NATT
1773 if (encap)
1774 {
1775 add_encap_ext(msg, src, dst);
1776 }
1777 #endif /*HAVE_NATT*/
1778
1779 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1780 {
1781 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
1782 return FAILED;
1783 }
1784 else if (out->sadb_msg_errno)
1785 {
1786 DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)",
1787 ntohl(spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1788 free(out);
1789 return FAILED;
1790 }
1791
1792 free(out);
1793 return SUCCESS;
1794 }
1795
1796 METHOD(kernel_ipsec_t, update_sa, status_t,
1797 private_kernel_pfkey_ipsec_t *this, u_int32_t spi, u_int8_t protocol,
1798 u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
1799 bool encap, bool new_encap, mark_t mark)
1800 {
1801 unsigned char request[PFKEY_BUFFER_SIZE];
1802 struct sadb_msg *msg, *out;
1803 struct sadb_sa *sa;
1804 pfkey_msg_t response;
1805 size_t len;
1806
1807 /* we can't update the SA if any of the ip addresses have changed.
1808 * that's because we can't use SADB_UPDATE and by deleting and readding the
1809 * SA the sequence numbers would get lost */
1810 if (!src->ip_equals(src, new_src) ||
1811 !dst->ip_equals(dst, new_dst))
1812 {
1813 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address "
1814 "changes are not supported", ntohl(spi));
1815 return NOT_SUPPORTED;
1816 }
1817
1818 /* if IPComp is used, we first update the IPComp SA */
1819 if (cpi)
1820 {
1821 update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0,
1822 src, dst, new_src, new_dst, FALSE, FALSE, mark);
1823 }
1824
1825 memset(&request, 0, sizeof(request));
1826
1827 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1828
1829 msg = (struct sadb_msg*)request;
1830 msg->sadb_msg_version = PF_KEY_V2;
1831 msg->sadb_msg_type = SADB_GET;
1832 msg->sadb_msg_satype = proto2satype(protocol);
1833 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1834
1835 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1836 sa->sadb_sa_exttype = SADB_EXT_SA;
1837 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1838 sa->sadb_sa_spi = spi;
1839 PFKEY_EXT_ADD(msg, sa);
1840
1841 /* the kernel wants a SADB_EXT_ADDRESS_SRC to be present even though
1842 * it is not used for anything. */
1843 add_anyaddr_ext(msg, dst->get_family(dst), SADB_EXT_ADDRESS_SRC);
1844 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1845
1846 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1847 {
1848 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1849 return FAILED;
1850 }
1851 else if (out->sadb_msg_errno)
1852 {
1853 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1854 ntohl(spi), strerror(out->sadb_msg_errno),
1855 out->sadb_msg_errno);
1856 free(out);
1857 return FAILED;
1858 }
1859 else if (parse_pfkey_message(out, &response) != SUCCESS)
1860 {
1861 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing "
1862 "response from kernel failed", ntohl(spi));
1863 free(out);
1864 return FAILED;
1865 }
1866
1867 DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
1868 ntohl(spi), src, dst, new_src, new_dst);
1869
1870 memset(&request, 0, sizeof(request));
1871
1872 msg = (struct sadb_msg*)request;
1873 msg->sadb_msg_version = PF_KEY_V2;
1874 msg->sadb_msg_type = SADB_UPDATE;
1875 msg->sadb_msg_satype = proto2satype(protocol);
1876 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1877
1878 #ifdef __APPLE__
1879 {
1880 struct sadb_sa_2 *sa_2;
1881 sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1882 sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2));
1883 memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa));
1884 if (encap)
1885 {
1886 sa_2->sadb_sa_natt_port = new_dst->get_port(new_dst);
1887 sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT;
1888 }
1889 }
1890 #else
1891 PFKEY_EXT_COPY(msg, response.sa);
1892 #endif
1893 PFKEY_EXT_COPY(msg, response.x_sa2);
1894
1895 PFKEY_EXT_COPY(msg, response.src);
1896 PFKEY_EXT_COPY(msg, response.dst);
1897
1898 PFKEY_EXT_COPY(msg, response.lft_soft);
1899 PFKEY_EXT_COPY(msg, response.lft_hard);
1900
1901 if (response.key_encr)
1902 {
1903 PFKEY_EXT_COPY(msg, response.key_encr);
1904 }
1905
1906 if (response.key_auth)
1907 {
1908 PFKEY_EXT_COPY(msg, response.key_auth);
1909 }
1910
1911 #ifdef HAVE_NATT
1912 if (new_encap)
1913 {
1914 add_encap_ext(msg, new_src, new_dst);
1915 }
1916 #endif /*HAVE_NATT*/
1917
1918 free(out);
1919
1920 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1921 {
1922 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
1923 return FAILED;
1924 }
1925 else if (out->sadb_msg_errno)
1926 {
1927 DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)",
1928 ntohl(spi), strerror(out->sadb_msg_errno),
1929 out->sadb_msg_errno);
1930 free(out);
1931 return FAILED;
1932 }
1933 free(out);
1934
1935 return SUCCESS;
1936 }
1937
1938 METHOD(kernel_ipsec_t, query_sa, status_t,
1939 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1940 u_int32_t spi, u_int8_t protocol, mark_t mark,
1941 u_int64_t *bytes, u_int64_t *packets, time_t *time)
1942 {
1943 unsigned char request[PFKEY_BUFFER_SIZE];
1944 struct sadb_msg *msg, *out;
1945 struct sadb_sa *sa;
1946 pfkey_msg_t response;
1947 size_t len;
1948
1949 memset(&request, 0, sizeof(request));
1950
1951 DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
1952
1953 msg = (struct sadb_msg*)request;
1954 msg->sadb_msg_version = PF_KEY_V2;
1955 msg->sadb_msg_type = SADB_GET;
1956 msg->sadb_msg_satype = proto2satype(protocol);
1957 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1958
1959 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1960 sa->sadb_sa_exttype = SADB_EXT_SA;
1961 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1962 sa->sadb_sa_spi = spi;
1963 PFKEY_EXT_ADD(msg, sa);
1964
1965 /* the Linux Kernel doesn't care for the src address, but other systems do
1966 * (e.g. FreeBSD)
1967 */
1968 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1969 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1970
1971 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1972 {
1973 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1974 return FAILED;
1975 }
1976 else if (out->sadb_msg_errno)
1977 {
1978 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
1979 ntohl(spi), strerror(out->sadb_msg_errno),
1980 out->sadb_msg_errno);
1981 free(out);
1982 return FAILED;
1983 }
1984 else if (parse_pfkey_message(out, &response) != SUCCESS)
1985 {
1986 DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
1987 free(out);
1988 return FAILED;
1989 }
1990 if (bytes)
1991 {
1992 *bytes = response.lft_current->sadb_lifetime_bytes;
1993 }
1994 if (packets)
1995 {
1996 /* at least on Linux and FreeBSD this contains the number of packets */
1997 *packets = response.lft_current->sadb_lifetime_allocations;
1998 }
1999 if (time)
2000 {
2001 #ifdef __APPLE__
2002 /* OS X uses the "last" time of use in usetime */
2003 *time = response.lft_current->sadb_lifetime_usetime;
2004 #else /* !__APPLE__ */
2005 /* on Linux, sadb_lifetime_usetime is set to the "first" time of use,
2006 * which is actually correct according to PF_KEY. We have to query
2007 * policies for the last usetime. */
2008 *time = 0;
2009 #endif /* !__APPLE__ */
2010 }
2011
2012 free(out);
2013 return SUCCESS;
2014 }
2015
2016 METHOD(kernel_ipsec_t, del_sa, status_t,
2017 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2018 u_int32_t spi, u_int8_t protocol, u_int16_t cpi, mark_t mark)
2019 {
2020 unsigned char request[PFKEY_BUFFER_SIZE];
2021 struct sadb_msg *msg, *out;
2022 struct sadb_sa *sa;
2023 size_t len;
2024
2025 /* if IPComp was used, we first delete the additional IPComp SA */
2026 if (cpi)
2027 {
2028 del_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, 0, mark);
2029 }
2030
2031 memset(&request, 0, sizeof(request));
2032
2033 DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
2034
2035 msg = (struct sadb_msg*)request;
2036 msg->sadb_msg_version = PF_KEY_V2;
2037 msg->sadb_msg_type = SADB_DELETE;
2038 msg->sadb_msg_satype = proto2satype(protocol);
2039 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2040
2041 sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
2042 sa->sadb_sa_exttype = SADB_EXT_SA;
2043 sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
2044 sa->sadb_sa_spi = spi;
2045 PFKEY_EXT_ADD(msg, sa);
2046
2047 /* the Linux Kernel doesn't care for the src address, but other systems do
2048 * (e.g. FreeBSD)
2049 */
2050 add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
2051 add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
2052
2053 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2054 {
2055 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
2056 return FAILED;
2057 }
2058 else if (out->sadb_msg_errno)
2059 {
2060 DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)",
2061 ntohl(spi), strerror(out->sadb_msg_errno),
2062 out->sadb_msg_errno);
2063 free(out);
2064 return FAILED;
2065 }
2066
2067 DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
2068 free(out);
2069 return SUCCESS;
2070 }
2071
2072 METHOD(kernel_ipsec_t, flush_sas, status_t,
2073 private_kernel_pfkey_ipsec_t *this)
2074 {
2075 unsigned char request[PFKEY_BUFFER_SIZE];
2076 struct sadb_msg *msg, *out;
2077 struct {
2078 u_int8_t proto;
2079 char *name;
2080 } protos[] = {
2081 { SADB_SATYPE_AH, "AH" },
2082 { SADB_SATYPE_ESP, "ESP" },
2083 { SADB_X_SATYPE_IPCOMP, "IPComp" },
2084 };
2085 size_t len;
2086 int i;
2087
2088 memset(&request, 0, sizeof(request));
2089
2090 msg = (struct sadb_msg*)request;
2091 msg->sadb_msg_version = PF_KEY_V2;
2092 msg->sadb_msg_type = SADB_FLUSH;
2093 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2094
2095 for (i = 0; i < countof(protos); i++)
2096 {
2097 DBG2(DBG_KNL, "flushing all %s SAD entries", protos[i].name);
2098
2099 msg->sadb_msg_satype = protos[i].proto;
2100 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2101 {
2102 DBG1(DBG_KNL, "unable to flush %s SAD entries", protos[i].name);
2103 return FAILED;
2104 }
2105 else if (out->sadb_msg_errno)
2106 {
2107 DBG1(DBG_KNL, "unable to flush %s SAD entries: %s (%d)",
2108 protos[i].name, strerror(out->sadb_msg_errno),
2109 out->sadb_msg_errno);
2110 free(out);
2111 return FAILED;
2112 }
2113 free(out);
2114 }
2115 return SUCCESS;
2116 }
2117
2118 /**
2119 * Add an explicit exclude route to a routing entry
2120 */
2121 static void add_exclude_route(private_kernel_pfkey_ipsec_t *this,
2122 route_entry_t *route, host_t *src, host_t *dst)
2123 {
2124 enumerator_t *enumerator;
2125 exclude_route_t *exclude;
2126 host_t *gtw;
2127
2128 enumerator = this->excludes->create_enumerator(this->excludes);
2129 while (enumerator->enumerate(enumerator, &exclude))
2130 {
2131 if (dst->ip_equals(dst, exclude->dst))
2132 {
2133 route->exclude = exclude;
2134 exclude->refs++;
2135 }
2136 }
2137 enumerator->destroy(enumerator);
2138
2139 if (!route->exclude)
2140 {
2141 DBG2(DBG_KNL, "installing new exclude route for %H src %H", dst, src);
2142 gtw = hydra->kernel_interface->get_nexthop(hydra->kernel_interface,
2143 dst, -1, NULL);
2144 if (gtw)
2145 {
2146 char *if_name = NULL;
2147
2148 if (hydra->kernel_interface->get_interface(
2149 hydra->kernel_interface, src, &if_name) &&
2150 hydra->kernel_interface->add_route(hydra->kernel_interface,
2151 dst->get_address(dst),
2152 dst->get_family(dst) == AF_INET ? 32 : 128,
2153 gtw, src, if_name) == SUCCESS)
2154 {
2155 INIT(exclude,
2156 .dst = dst->clone(dst),
2157 .src = src->clone(src),
2158 .gtw = gtw->clone(gtw),
2159 .refs = 1,
2160 );
2161 route->exclude = exclude;
2162 this->excludes->insert_last(this->excludes, exclude);
2163 }
2164 else
2165 {
2166 DBG1(DBG_KNL, "installing exclude route for %H failed", dst);
2167 }
2168 gtw->destroy(gtw);
2169 free(if_name);
2170 }
2171 else
2172 {
2173 DBG1(DBG_KNL, "gateway lookup for for %H failed", dst);
2174 }
2175 }
2176 }
2177
2178 /**
2179 * Remove an exclude route attached to a routing entry
2180 */
2181 static void remove_exclude_route(private_kernel_pfkey_ipsec_t *this,
2182 route_entry_t *route)
2183 {
2184 if (route->exclude)
2185 {
2186 enumerator_t *enumerator;
2187 exclude_route_t *exclude;
2188 bool removed = FALSE;
2189 host_t *dst;
2190
2191 enumerator = this->excludes->create_enumerator(this->excludes);
2192 while (enumerator->enumerate(enumerator, &exclude))
2193 {
2194 if (route->exclude == exclude)
2195 {
2196 if (--exclude->refs == 0)
2197 {
2198 this->excludes->remove_at(this->excludes, enumerator);
2199 removed = TRUE;
2200 break;
2201 }
2202 }
2203 }
2204 enumerator->destroy(enumerator);
2205
2206 if (removed)
2207 {
2208 char *if_name = NULL;
2209
2210 dst = route->exclude->dst;
2211 DBG2(DBG_KNL, "uninstalling exclude route for %H src %H",
2212 dst, route->exclude->src);
2213 if (hydra->kernel_interface->get_interface(
2214 hydra->kernel_interface,
2215 route->exclude->src, &if_name) &&
2216 hydra->kernel_interface->del_route(hydra->kernel_interface,
2217 dst->get_address(dst),
2218 dst->get_family(dst) == AF_INET ? 32 : 128,
2219 route->exclude->gtw, route->exclude->src,
2220 if_name) != SUCCESS)
2221 {
2222 DBG1(DBG_KNL, "uninstalling exclude route for %H failed", dst);
2223 }
2224 exclude_route_destroy(route->exclude);
2225 free(if_name);
2226 }
2227 route->exclude = NULL;
2228 }
2229 }
2230
2231 /**
2232 * Try to install a route to the given inbound policy
2233 */
2234 static bool install_route(private_kernel_pfkey_ipsec_t *this,
2235 policy_entry_t *policy, policy_sa_in_t *in)
2236 {
2237 route_entry_t *route, *old;
2238 host_t *host, *src, *dst;
2239 bool is_virtual;
2240
2241 if (hydra->kernel_interface->get_address_by_ts(hydra->kernel_interface,
2242 in->dst_ts, &host, &is_virtual) != SUCCESS)
2243 {
2244 return FALSE;
2245 }
2246
2247 /* switch src/dst, as we handle an IN policy */
2248 src = in->generic.sa->dst;
2249 dst = in->generic.sa->src;
2250
2251 INIT(route,
2252 .prefixlen = policy->src.mask,
2253 .src_ip = host,
2254 .dst_net = chunk_clone(policy->src.net->get_address(policy->src.net)),
2255 );
2256
2257 if (!dst->is_anyaddr(dst))
2258 {
2259 route->gateway = hydra->kernel_interface->get_nexthop(
2260 hydra->kernel_interface, dst, -1, src);
2261
2262 /* if the IP is virtual, we install the route over the interface it has
2263 * been installed on. Otherwise we use the interface we use for IKE, as
2264 * this is required for example on Linux. */
2265 if (is_virtual)
2266 {
2267 src = route->src_ip;
2268 }
2269 }
2270 else
2271 { /* for shunt policies */
2272 route->gateway = hydra->kernel_interface->get_nexthop(
2273 hydra->kernel_interface, policy->src.net,
2274 policy->src.mask, route->src_ip);
2275
2276 /* we don't have a source address, use the address we found */
2277 src = route->src_ip;
2278 }
2279
2280 /* get interface for route, using source address */
2281 if (!hydra->kernel_interface->get_interface(hydra->kernel_interface,
2282 src, &route->if_name))
2283 {
2284 route_entry_destroy(route);
2285 return FALSE;
2286 }
2287
2288 if (policy->route)
2289 {
2290 old = policy->route;
2291
2292 if (route_entry_equals(old, route))
2293 { /* such a route already exists */
2294 route_entry_destroy(route);
2295 return TRUE;
2296 }
2297 /* uninstall previously installed route */
2298 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2299 old->dst_net, old->prefixlen, old->gateway,
2300 old->src_ip, old->if_name) != SUCCESS)
2301 {
2302 DBG1(DBG_KNL, "error uninstalling route installed with policy "
2303 "%R === %R %N", in->src_ts, in->dst_ts,
2304 policy_dir_names, policy->direction);
2305 }
2306 route_entry_destroy(old);
2307 policy->route = NULL;
2308 }
2309
2310 /* if remote traffic selector covers the IKE peer, add an exclude route */
2311 if (hydra->kernel_interface->get_features(
2312 hydra->kernel_interface) & KERNEL_REQUIRE_EXCLUDE_ROUTE)
2313 {
2314 if (in->src_ts->is_host(in->src_ts, dst))
2315 {
2316 DBG1(DBG_KNL, "can't install route for %R === %R %N, conflicts "
2317 "with IKE traffic", in->src_ts, in->dst_ts, policy_dir_names,
2318 policy->direction);
2319 route_entry_destroy(route);
2320 return FALSE;
2321 }
2322 if (in->src_ts->includes(in->src_ts, dst))
2323 {
2324 add_exclude_route(this, route, in->generic.sa->dst, dst);
2325 }
2326 }
2327
2328 DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
2329 in->src_ts, route->gateway, route->src_ip, route->if_name);
2330
2331 switch (hydra->kernel_interface->add_route(hydra->kernel_interface,
2332 route->dst_net, route->prefixlen, route->gateway,
2333 route->src_ip, route->if_name))
2334 {
2335 case ALREADY_DONE:
2336 /* route exists, do not uninstall */
2337 remove_exclude_route(this, route);
2338 route_entry_destroy(route);
2339 return TRUE;
2340 case SUCCESS:
2341 /* cache the installed route */
2342 policy->route = route;
2343 return TRUE;
2344 default:
2345 DBG1(DBG_KNL, "installing route failed: %R via %H src %H dev %s",
2346 in->src_ts, route->gateway, route->src_ip, route->if_name);
2347 remove_exclude_route(this, route);
2348 route_entry_destroy(route);
2349 return FALSE;
2350 }
2351 }
2352
2353 /**
2354 * Add or update a policy in the kernel.
2355 *
2356 * Note: The mutex has to be locked when entering this function.
2357 */
2358 static status_t add_policy_internal(private_kernel_pfkey_ipsec_t *this,
2359 policy_entry_t *policy, policy_sa_t *mapping, bool update)
2360 {
2361 unsigned char request[PFKEY_BUFFER_SIZE];
2362 struct sadb_msg *msg, *out;
2363 struct sadb_x_policy *pol;
2364 struct sadb_x_ipsecrequest *req;
2365 ipsec_sa_t *ipsec = mapping->sa;
2366 pfkey_msg_t response;
2367 size_t len;
2368 ipsec_mode_t proto_mode;
2369 status_t status;
2370
2371 memset(&request, 0, sizeof(request));
2372
2373 msg = (struct sadb_msg*)request;
2374 msg->sadb_msg_version = PF_KEY_V2;
2375 msg->sadb_msg_type = update ? SADB_X_SPDUPDATE : SADB_X_SPDADD;
2376 msg->sadb_msg_satype = 0;
2377 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2378
2379 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2380 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2381 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2382 pol->sadb_x_policy_id = 0;
2383 pol->sadb_x_policy_dir = dir2kernel(policy->direction);
2384 pol->sadb_x_policy_type = type2kernel(mapping->type);
2385 #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
2386 pol->sadb_x_policy_priority = mapping->priority;
2387 #endif
2388
2389 /* one or more sadb_x_ipsecrequest extensions are added to the
2390 * sadb_x_policy extension */
2391 proto_mode = ipsec->cfg.mode;
2392
2393 req = (struct sadb_x_ipsecrequest*)(pol + 1);
2394
2395 if (ipsec->cfg.ipcomp.transform != IPCOMP_NONE)
2396 {
2397 req->sadb_x_ipsecrequest_proto = IPPROTO_COMP;
2398
2399 /* !!! the length here MUST be in octets instead of 64 bit words */
2400 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2401 req->sadb_x_ipsecrequest_mode = mode2kernel(ipsec->cfg.mode);
2402 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2403 req->sadb_x_ipsecrequest_level = (policy->direction == POLICY_OUT) ?
2404 IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_USE;
2405 if (ipsec->cfg.mode == MODE_TUNNEL)
2406 {
2407 len = hostcpy(req + 1, ipsec->src, FALSE);
2408 req->sadb_x_ipsecrequest_len += len;
2409 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2410 req->sadb_x_ipsecrequest_len += len;
2411 /* use transport mode for other SAs */
2412 proto_mode = MODE_TRANSPORT;
2413 }
2414
2415 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2416 req = (struct sadb_x_ipsecrequest*)((char*)(req) +
2417 req->sadb_x_ipsecrequest_len);
2418 }
2419
2420 req->sadb_x_ipsecrequest_proto = ipsec->cfg.esp.use ? IPPROTO_ESP
2421 : IPPROTO_AH;
2422 /* !!! the length here MUST be in octets instead of 64 bit words */
2423 req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2424 req->sadb_x_ipsecrequest_mode = mode2kernel(proto_mode);
2425 req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2426 req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2427 if (proto_mode == MODE_TUNNEL)
2428 {
2429 len = hostcpy(req + 1, ipsec->src, FALSE);
2430 req->sadb_x_ipsecrequest_len += len;
2431 len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2432 req->sadb_x_ipsecrequest_len += len;
2433 }
2434
2435 pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2436 PFKEY_EXT_ADD(msg, pol);
2437
2438 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2439 policy->src.mask, TRUE);
2440 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2441 policy->dst.mask, TRUE);
2442
2443 #ifdef __FreeBSD__
2444 { /* on FreeBSD a lifetime has to be defined to be able to later query
2445 * the current use time. */
2446 struct sadb_lifetime *lft;
2447 lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
2448 lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2449 lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
2450 lft->sadb_lifetime_addtime = LONG_MAX;
2451 PFKEY_EXT_ADD(msg, lft);
2452 }
2453 #endif
2454
2455 this->mutex->unlock(this->mutex);
2456
2457 status = pfkey_send(this, msg, &out, &len);
2458 if (status == SUCCESS && !update && out->sadb_msg_errno == EEXIST)
2459 {
2460 DBG1(DBG_KNL, "policy already exists, try to update it");
2461 free(out);
2462 msg->sadb_msg_type = SADB_X_SPDUPDATE;
2463 status = pfkey_send(this, msg, &out, &len);
2464 }
2465 if (status != SUCCESS)
2466 {
2467 return FAILED;
2468 }
2469 else if (out->sadb_msg_errno)
2470 {
2471 DBG1(DBG_KNL, "unable to %s policy: %s (%d)",
2472 update ? "update" : "add", strerror(out->sadb_msg_errno),
2473 out->sadb_msg_errno);
2474 free(out);
2475 return FAILED;
2476 }
2477 else if (parse_pfkey_message(out, &response) != SUCCESS)
2478 {
2479 DBG1(DBG_KNL, "unable to %s policy: parsing response from kernel "
2480 "failed", update ? "update" : "add");
2481 free(out);
2482 return FAILED;
2483 }
2484
2485 /* we try to find the policy again and update the kernel index */
2486 this->mutex->lock(this->mutex);
2487 if (this->policies->find_first(this->policies, NULL,
2488 (void**)&policy) != SUCCESS)
2489 {
2490 DBG2(DBG_KNL, "unable to update index, the policy is already gone, "
2491 "ignoring");
2492 this->mutex->unlock(this->mutex);
2493 free(out);
2494 return SUCCESS;
2495 }
2496 policy->index = response.x_policy->sadb_x_policy_id;
2497 free(out);
2498
2499 /* install a route, if:
2500 * - this is an inbound policy (to just get one for each child)
2501 * - we are in tunnel mode or install a bypass policy
2502 * - routing is not disabled via strongswan.conf
2503 */
2504 if (policy->direction == POLICY_IN && this->install_routes &&
2505 (mapping->type != POLICY_IPSEC || ipsec->cfg.mode != MODE_TRANSPORT))
2506 {
2507 install_route(this, policy, (policy_sa_in_t*)mapping);
2508 }
2509 this->mutex->unlock(this->mutex);
2510 return SUCCESS;
2511 }
2512
2513 METHOD(kernel_ipsec_t, add_policy, status_t,
2514 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2515 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2516 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2517 mark_t mark, policy_priority_t priority)
2518 {
2519 policy_entry_t *policy, *found = NULL;
2520 policy_sa_t *assigned_sa, *current_sa;
2521 enumerator_t *enumerator;
2522 bool update = TRUE;
2523
2524 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2525 { /* FWD policies are not supported on all platforms */
2526 return SUCCESS;
2527 }
2528
2529 /* create a policy */
2530 policy = create_policy_entry(src_ts, dst_ts, direction);
2531
2532 /* find a matching policy */
2533 this->mutex->lock(this->mutex);
2534 if (this->policies->find_first(this->policies,
2535 (linked_list_match_t)policy_entry_equals,
2536 (void**)&found, policy) == SUCCESS)
2537 { /* use existing policy */
2538 DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
2539 "refcount", src_ts, dst_ts, policy_dir_names, direction);
2540 policy_entry_destroy(policy, this);
2541 policy = found;
2542 }
2543 else
2544 { /* use the new one, if we have no such policy */
2545 this->policies->insert_first(this->policies, policy);
2546 policy->used_by = linked_list_create();
2547 }
2548
2549 /* cache the assigned IPsec SA */
2550 assigned_sa = policy_sa_create(this, direction, type, src, dst, src_ts,
2551 dst_ts, sa);
2552 assigned_sa->priority = get_priority(policy, priority);
2553
2554 /* insert the SA according to its priority */
2555 enumerator = policy->used_by->create_enumerator(policy->used_by);
2556 while (enumerator->enumerate(enumerator, (void**)&current_sa))
2557 {
2558 if (current_sa->priority >= assigned_sa->priority)
2559 {
2560 break;
2561 }
2562 update = FALSE;
2563 }
2564 policy->used_by->insert_before(policy->used_by, enumerator, assigned_sa);
2565 enumerator->destroy(enumerator);
2566
2567 if (!update)
2568 { /* we don't update the policy if the priority is lower than that of the
2569 * currently installed one */
2570 this->mutex->unlock(this->mutex);
2571 return SUCCESS;
2572 }
2573
2574 DBG2(DBG_KNL, "%s policy %R === %R %N",
2575 found ? "updating" : "adding", src_ts, dst_ts,
2576 policy_dir_names, direction);
2577
2578 if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
2579 {
2580 DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
2581 found ? "update" : "add", src_ts, dst_ts,
2582 policy_dir_names, direction);
2583 return FAILED;
2584 }
2585 return SUCCESS;
2586 }
2587
2588 METHOD(kernel_ipsec_t, query_policy, status_t,
2589 private_kernel_pfkey_ipsec_t *this, traffic_selector_t *src_ts,
2590 traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
2591 time_t *use_time)
2592 {
2593 unsigned char request[PFKEY_BUFFER_SIZE];
2594 struct sadb_msg *msg, *out;
2595 struct sadb_x_policy *pol;
2596 policy_entry_t *policy, *found = NULL;
2597 pfkey_msg_t response;
2598 size_t len;
2599
2600 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2601 { /* FWD policies are not supported on all platforms */
2602 return NOT_FOUND;
2603 }
2604
2605 DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
2606 policy_dir_names, direction);
2607
2608 /* create a policy */
2609 policy = create_policy_entry(src_ts, dst_ts, direction);
2610
2611 /* find a matching policy */
2612 this->mutex->lock(this->mutex);
2613 if (this->policies->find_first(this->policies,
2614 (linked_list_match_t)policy_entry_equals,
2615 (void**)&found, policy) != SUCCESS)
2616 {
2617 DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", src_ts,
2618 dst_ts, policy_dir_names, direction);
2619 policy_entry_destroy(policy, this);
2620 this->mutex->unlock(this->mutex);
2621 return NOT_FOUND;
2622 }
2623 policy_entry_destroy(policy, this);
2624 policy = found;
2625
2626 memset(&request, 0, sizeof(request));
2627
2628 msg = (struct sadb_msg*)request;
2629 msg->sadb_msg_version = PF_KEY_V2;
2630 msg->sadb_msg_type = SADB_X_SPDGET;
2631 msg->sadb_msg_satype = 0;
2632 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2633
2634 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2635 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2636 pol->sadb_x_policy_id = policy->index;
2637 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2638 pol->sadb_x_policy_dir = dir2kernel(direction);
2639 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2640 PFKEY_EXT_ADD(msg, pol);
2641
2642 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2643 policy->src.mask, TRUE);
2644 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2645 policy->dst.mask, TRUE);
2646
2647 this->mutex->unlock(this->mutex);
2648
2649 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2650 {
2651 DBG1(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
2652 policy_dir_names, direction);
2653 return FAILED;
2654 }
2655 else if (out->sadb_msg_errno)
2656 {
2657 DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", src_ts,
2658 dst_ts, policy_dir_names, direction,
2659 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2660 free(out);
2661 return FAILED;
2662 }
2663 else if (parse_pfkey_message(out, &response) != SUCCESS)
2664 {
2665 DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response "
2666 "from kernel failed", src_ts, dst_ts, policy_dir_names,
2667 direction);
2668 free(out);
2669 return FAILED;
2670 }
2671 else if (response.lft_current == NULL)
2672 {
2673 DBG2(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no "
2674 "use time", src_ts, dst_ts, policy_dir_names, direction);
2675 free(out);
2676 return FAILED;
2677 }
2678
2679 /* we need the monotonic time, but the kernel returns system time. */
2680 if (response.lft_current->sadb_lifetime_usetime)
2681 {
2682 *use_time = time_monotonic(NULL) -
2683 (time(NULL) - response.lft_current->sadb_lifetime_usetime);
2684 }
2685 else
2686 {
2687 *use_time = 0;
2688 }
2689 free(out);
2690 return SUCCESS;
2691 }
2692
2693 METHOD(kernel_ipsec_t, del_policy, status_t,
2694 private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
2695 traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
2696 policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
2697 mark_t mark, policy_priority_t prio)
2698 {
2699 unsigned char request[PFKEY_BUFFER_SIZE];
2700 struct sadb_msg *msg, *out;
2701 struct sadb_x_policy *pol;
2702 policy_entry_t *policy, *found = NULL;
2703 policy_sa_t *mapping, *to_remove = NULL;
2704 enumerator_t *enumerator;
2705 bool first = TRUE, is_installed = TRUE;
2706 u_int32_t priority;
2707 size_t len;
2708 ipsec_sa_t assigned_sa = {
2709 .src = src,
2710 .dst = dst,
2711 .cfg = *sa,
2712 };
2713
2714 if (dir2kernel(direction) == IPSEC_DIR_INVALID)
2715 { /* FWD policies are not supported on all platforms */
2716 return SUCCESS;
2717 }
2718
2719 DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
2720 policy_dir_names, direction);
2721
2722 /* create a policy */
2723 policy = create_policy_entry(src_ts, dst_ts, direction);
2724
2725 /* find a matching policy */
2726 this->mutex->lock(this->mutex);
2727 if (this->policies->find_first(this->policies,
2728 (linked_list_match_t)policy_entry_equals,
2729 (void**)&found, policy) != SUCCESS)
2730 {
2731 DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
2732 dst_ts, policy_dir_names, direction);
2733 policy_entry_destroy(policy, this);
2734 this->mutex->unlock(this->mutex);
2735 return NOT_FOUND;
2736 }
2737 policy_entry_destroy(policy, this);
2738 policy = found;
2739
2740 /* remove mapping to SA by reqid and priority, if multiple match, which
2741 * could happen when rekeying due to an address change, remove the oldest */
2742 priority = get_priority(policy, prio);
2743 enumerator = policy->used_by->create_enumerator(policy->used_by);
2744 while (enumerator->enumerate(enumerator, (void**)&mapping))
2745 {
2746 if (priority == mapping->priority &&
2747 ipsec_sa_equals(mapping->sa, &assigned_sa))
2748 {
2749 to_remove = mapping;
2750 is_installed = first;
2751 }
2752 else if (priority < mapping->priority)
2753 {
2754 break;
2755 }
2756 first = FALSE;
2757 }
2758 enumerator->destroy(enumerator);
2759 if (!to_remove)
2760 { /* sanity check */
2761 this->mutex->unlock(this->mutex);
2762 return SUCCESS;
2763 }
2764 policy->used_by->remove(policy->used_by, to_remove, NULL);
2765 mapping = to_remove;
2766
2767 if (policy->used_by->get_count(policy->used_by) > 0)
2768 { /* policy is used by more SAs, keep in kernel */
2769 DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
2770 policy_sa_destroy(mapping, &direction, this);
2771
2772 if (!is_installed)
2773 { /* no need to update as the policy was not installed for this SA */
2774 this->mutex->unlock(this->mutex);
2775 return SUCCESS;
2776 }
2777
2778 DBG2(DBG_KNL, "updating policy %R === %R %N", src_ts, dst_ts,
2779 policy_dir_names, direction);
2780 policy->used_by->get_first(policy->used_by, (void**)&mapping);
2781 if (add_policy_internal(this, policy, mapping, TRUE) != SUCCESS)
2782 {
2783 DBG1(DBG_KNL, "unable to update policy %R === %R %N",
2784 src_ts, dst_ts, policy_dir_names, direction);
2785 return FAILED;
2786 }
2787 return SUCCESS;
2788 }
2789
2790 memset(&request, 0, sizeof(request));
2791
2792 msg = (struct sadb_msg*)request;
2793 msg->sadb_msg_version = PF_KEY_V2;
2794 msg->sadb_msg_type = SADB_X_SPDDELETE;
2795 msg->sadb_msg_satype = 0;
2796 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2797
2798 pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2799 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2800 pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2801 pol->sadb_x_policy_dir = dir2kernel(direction);
2802 pol->sadb_x_policy_type = type2kernel(mapping->type);
2803 PFKEY_EXT_ADD(msg, pol);
2804
2805 add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2806 policy->src.mask, TRUE);
2807 add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2808 policy->dst.mask, TRUE);
2809
2810 if (policy->route)
2811 {
2812 route_entry_t *route = policy->route;
2813 if (hydra->kernel_interface->del_route(hydra->kernel_interface,
2814 route->dst_net, route->prefixlen, route->gateway,
2815 route->src_ip, route->if_name) != SUCCESS)
2816 {
2817 DBG1(DBG_KNL, "error uninstalling route installed with "
2818 "policy %R === %R %N", src_ts, dst_ts,
2819 policy_dir_names, direction);
2820 }
2821 remove_exclude_route(this, route);
2822 }
2823
2824 this->policies->remove(this->policies, found, NULL);
2825 policy_sa_destroy(mapping, &direction, this);
2826 policy_entry_destroy(policy, this);
2827 this->mutex->unlock(this->mutex);
2828
2829 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2830 {
2831 DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
2832 policy_dir_names, direction);
2833 return FAILED;
2834 }
2835 else if (out->sadb_msg_errno)
2836 {
2837 DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", src_ts,
2838 dst_ts, policy_dir_names, direction,
2839 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2840 free(out);
2841 return FAILED;
2842 }
2843 free(out);
2844 return SUCCESS;
2845 }
2846
2847 METHOD(kernel_ipsec_t, flush_policies, status_t,
2848 private_kernel_pfkey_ipsec_t *this)
2849 {
2850 unsigned char request[PFKEY_BUFFER_SIZE];
2851 struct sadb_msg *msg, *out;
2852 size_t len;
2853
2854 memset(&request, 0, sizeof(request));
2855
2856 DBG2(DBG_KNL, "flushing all policies from SPD");
2857
2858 msg = (struct sadb_msg*)request;
2859 msg->sadb_msg_version = PF_KEY_V2;
2860 msg->sadb_msg_type = SADB_X_SPDFLUSH;
2861 msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2862 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2863
2864 if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2865 {
2866 DBG1(DBG_KNL, "unable to flush SPD entries");
2867 return FAILED;
2868 }
2869 else if (out->sadb_msg_errno)
2870 {
2871 DBG1(DBG_KNL, "unable to flush SPD entries: %s (%d)",
2872 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2873 free(out);
2874 return FAILED;
2875 }
2876 free(out);
2877 return SUCCESS;
2878 }
2879
2880 /**
2881 * Register a socket for ACQUIRE/EXPIRE messages
2882 */
2883 static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this,
2884 u_int8_t satype)
2885 {
2886 unsigned char request[PFKEY_BUFFER_SIZE];
2887 struct sadb_msg *msg, *out;
2888 size_t len;
2889
2890 memset(&request, 0, sizeof(request));
2891
2892 msg = (struct sadb_msg*)request;
2893 msg->sadb_msg_version = PF_KEY_V2;
2894 msg->sadb_msg_type = SADB_REGISTER;
2895 msg->sadb_msg_satype = satype;
2896 msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2897
2898 if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS)
2899 {
2900 DBG1(DBG_KNL, "unable to register PF_KEY socket");
2901 return FAILED;
2902 }
2903 else if (out->sadb_msg_errno)
2904 {
2905 DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)",
2906 strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2907 free(out);
2908 return FAILED;
2909 }
2910 free(out);
2911 return SUCCESS;
2912 }
2913