Annotation of embedaddon/strongswan/src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2008-2018 Tobias Brunner
3: * Copyright (C) 2008 Andreas Steffen
4: * HSR 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 <daemon.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 200000
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: uint16_t sadb_sa_natt_port;
153: uint16_t sadb_reserved0;
154: uint32_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: * whether to install the route via internal interface
224: */
225: bool route_via_internal;
226:
227: /**
228: * mutex to lock access to the PF_KEY socket
229: */
230: mutex_t *mutex_pfkey;
231:
232: /**
233: * PF_KEY socket to communicate with the kernel
234: */
235: int socket;
236:
237: /**
238: * PF_KEY socket to receive acquire and expire events
239: */
240: int socket_events;
241:
242: /**
243: * sequence number for messages sent to the kernel
244: */
245: int seq;
246: };
247:
248: typedef struct exclude_route_t exclude_route_t;
249:
250: /**
251: * Exclude route definition
252: */
253: struct exclude_route_t {
254: /** destination address of exclude */
255: host_t *dst;
256: /** source address for route */
257: host_t *src;
258: /** nexthop exclude has been installed */
259: host_t *gtw;
260: /** references to this route */
261: int refs;
262: };
263:
264: /**
265: * clean up a route exclude entry
266: */
267: static void exclude_route_destroy(exclude_route_t *this)
268: {
269: this->dst->destroy(this->dst);
270: this->src->destroy(this->src);
271: this->gtw->destroy(this->gtw);
272: free(this);
273: }
274:
275: typedef struct route_entry_t route_entry_t;
276:
277: /**
278: * installed routing entry
279: */
280: struct route_entry_t {
281: /** name of the interface the route is bound to */
282: char *if_name;
283:
284: /** source ip of the route */
285: host_t *src_ip;
286:
287: /** gateway for this route */
288: host_t *gateway;
289:
290: /** destination net */
291: chunk_t dst_net;
292:
293: /** destination net prefixlen */
294: uint8_t prefixlen;
295:
296: /** reference to exclude route, if any */
297: exclude_route_t *exclude;
298: };
299:
300: /**
301: * destroy an route_entry_t object
302: */
303: static void route_entry_destroy(route_entry_t *this)
304: {
305: free(this->if_name);
306: DESTROY_IF(this->src_ip);
307: DESTROY_IF(this->gateway);
308: chunk_free(&this->dst_net);
309: free(this);
310: }
311:
312: /**
313: * compare two route_entry_t objects
314: */
315: static bool route_entry_equals(route_entry_t *a, route_entry_t *b)
316: {
317: return a->if_name && b->if_name && streq(a->if_name, b->if_name) &&
318: a->src_ip->ip_equals(a->src_ip, b->src_ip) &&
319: a->gateway && b->gateway &&
320: a->gateway->ip_equals(a->gateway, b->gateway) &&
321: chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen;
322: }
323:
324: typedef struct ipsec_sa_t ipsec_sa_t;
325:
326: /**
327: * IPsec SA assigned to a policy.
328: */
329: struct ipsec_sa_t {
330: /** Source address of this SA */
331: host_t *src;
332:
333: /** Destination address of this SA */
334: host_t *dst;
335:
336: /** Description of this SA */
337: ipsec_sa_cfg_t cfg;
338:
339: /** Reference count for this SA */
340: refcount_t refcount;
341: };
342:
343: /**
344: * Hash function for ipsec_sa_t objects
345: */
346: static u_int ipsec_sa_hash(ipsec_sa_t *sa)
347: {
348: return chunk_hash_inc(sa->src->get_address(sa->src),
349: chunk_hash_inc(sa->dst->get_address(sa->dst),
350: chunk_hash(chunk_from_thing(sa->cfg))));
351: }
352:
353: /**
354: * Equality function for ipsec_sa_t objects
355: */
356: static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa)
357: {
358: return sa->src->ip_equals(sa->src, other_sa->src) &&
359: sa->dst->ip_equals(sa->dst, other_sa->dst) &&
360: ipsec_sa_cfg_equals(&sa->cfg, &other_sa->cfg);
361: }
362:
363: /**
364: * Allocate or reference an IPsec SA object
365: */
366: static ipsec_sa_t *ipsec_sa_create(private_kernel_pfkey_ipsec_t *this,
367: host_t *src, host_t *dst,
368: ipsec_sa_cfg_t *cfg)
369: {
370: ipsec_sa_t *sa, *found;
371: INIT(sa,
372: .src = src,
373: .dst = dst,
374: .cfg = *cfg,
375: );
376: found = this->sas->get(this->sas, sa);
377: if (!found)
378: {
379: sa->src = src->clone(src);
380: sa->dst = dst->clone(dst);
381: this->sas->put(this->sas, sa, sa);
382: }
383: else
384: {
385: free(sa);
386: sa = found;
387: }
388: ref_get(&sa->refcount);
389: return sa;
390: }
391:
392: /**
393: * Release and destroy an IPsec SA object
394: */
395: static void ipsec_sa_destroy(private_kernel_pfkey_ipsec_t *this,
396: ipsec_sa_t *sa)
397: {
398: if (ref_put(&sa->refcount))
399: {
400: this->sas->remove(this->sas, sa);
401: DESTROY_IF(sa->src);
402: DESTROY_IF(sa->dst);
403: free(sa);
404: }
405: }
406:
407: typedef struct policy_sa_t policy_sa_t;
408: typedef struct policy_sa_out_t policy_sa_out_t;
409:
410: /**
411: * Mapping between a policy and an IPsec SA.
412: */
413: struct policy_sa_t {
414: /** Priority assigned to the policy when installed with this SA */
415: uint32_t priority;
416:
417: /** Base priority assigned to the policy when installed with this SA */
418: uint32_t auto_priority;
419:
420: /** Type of the policy */
421: policy_type_t type;
422:
423: /** Assigned SA */
424: ipsec_sa_t *sa;
425: };
426:
427: /**
428: * For outbound policies we also cache the traffic selectors in order to install
429: * the route.
430: */
431: struct policy_sa_out_t {
432: /** Generic interface */
433: policy_sa_t generic;
434:
435: /** Source traffic selector of this policy */
436: traffic_selector_t *src_ts;
437:
438: /** Destination traffic selector of this policy */
439: traffic_selector_t *dst_ts;
440: };
441:
442: /**
443: * Create a policy_sa(_in)_t object
444: */
445: static policy_sa_t *policy_sa_create(private_kernel_pfkey_ipsec_t *this,
446: policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst,
447: traffic_selector_t *src_ts, traffic_selector_t *dst_ts, ipsec_sa_cfg_t *cfg)
448: {
449: policy_sa_t *policy;
450:
451: if (dir == POLICY_OUT)
452: {
453: policy_sa_out_t *out;
454: INIT(out,
455: .src_ts = src_ts->clone(src_ts),
456: .dst_ts = dst_ts->clone(dst_ts),
457: );
458: policy = &out->generic;
459: }
460: else
461: {
462: INIT(policy, .priority = 0);
463: }
464: policy->type = type;
465: policy->sa = ipsec_sa_create(this, src, dst, cfg);
466: return policy;
467: }
468:
469: /**
470: * Destroy a policy_sa(_in)_t object
471: */
472: static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t dir,
473: private_kernel_pfkey_ipsec_t *this)
474: {
475: if (dir == POLICY_OUT)
476: {
477: policy_sa_out_t *out = (policy_sa_out_t*)policy;
478: out->src_ts->destroy(out->src_ts);
479: out->dst_ts->destroy(out->dst_ts);
480: }
481: ipsec_sa_destroy(this, policy->sa);
482: free(policy);
483: }
484:
485: CALLBACK(policy_sa_destroy_cb, void,
486: policy_sa_t *policy, va_list args)
487: {
488: private_kernel_pfkey_ipsec_t *this;
489: policy_dir_t dir;
490:
491: VA_ARGS_VGET(args, dir, this);
492: policy_sa_destroy(policy, dir, this);
493: }
494:
495: typedef struct policy_entry_t policy_entry_t;
496:
497: /**
498: * installed kernel policy.
499: */
500: struct policy_entry_t {
501: /** Index assigned by the kernel */
502: uint32_t index;
503:
504: /** Direction of this policy: in, out, forward */
505: uint8_t direction;
506:
507: /** Parameters of installed policy */
508: struct {
509: /** Subnet and port */
510: host_t *net;
511: /** Subnet mask */
512: uint8_t mask;
513: /** Protocol */
514: uint8_t proto;
515: } src, dst;
516:
517: /** Associated route installed for this policy */
518: route_entry_t *route;
519:
520: /** List of SAs this policy is used by, ordered by priority */
521: linked_list_t *used_by;
522: };
523:
524: /**
525: * Create a policy_entry_t object
526: */
527: static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts,
528: traffic_selector_t *dst_ts,
529: policy_dir_t dir)
530: {
531: policy_entry_t *policy;
532: INIT(policy,
533: .direction = dir,
534: );
535: uint16_t port;
536: uint8_t proto;
537:
538: src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask);
539: dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask);
540:
541: /* src or dest proto may be "any" (0), use more restrictive one */
542: proto = max(src_ts->get_protocol(src_ts), dst_ts->get_protocol(dst_ts));
543: /* map the ports to ICMP type/code how the Linux kernel expects them, that
544: * is, type in src, code in dst */
545: if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6)
546: {
547: port = max(policy->src.net->get_port(policy->src.net),
548: policy->dst.net->get_port(policy->dst.net));
549: policy->src.net->set_port(policy->src.net,
550: traffic_selector_icmp_type(port));
551: policy->dst.net->set_port(policy->dst.net,
552: traffic_selector_icmp_code(port));
553: }
554: else if (!proto)
555: {
556: proto = IPSEC_PROTO_ANY;
557: }
558: policy->src.proto = policy->dst.proto = proto;
559:
560: return policy;
561: }
562:
563: /**
564: * Destroy a policy_entry_t object
565: */
566: static void policy_entry_destroy(policy_entry_t *policy,
567: private_kernel_pfkey_ipsec_t *this)
568: {
569: if (policy->route)
570: {
571: route_entry_destroy(policy->route);
572: }
573: if (policy->used_by)
574: {
575: policy->used_by->invoke_function(policy->used_by, policy_sa_destroy_cb,
576: policy->direction, this);
577: policy->used_by->destroy(policy->used_by);
578: }
579: DESTROY_IF(policy->src.net);
580: DESTROY_IF(policy->dst.net);
581: free(policy);
582: }
583:
584: CALLBACK(policy_entry_destroy_cb, void,
585: policy_entry_t *policy, va_list args)
586: {
587: private_kernel_pfkey_ipsec_t *this;
588:
589: VA_ARGS_VGET(args, this);
590: policy_entry_destroy(policy, this);
591: }
592:
593: CALLBACK(policy_entry_equals, bool,
594: policy_entry_t *current, va_list args)
595: {
596: policy_entry_t *policy;
597:
598: VA_ARGS_VGET(args, policy);
599: return current->direction == policy->direction &&
600: current->src.proto == policy->src.proto &&
601: current->dst.proto == policy->dst.proto &&
602: current->src.mask == policy->src.mask &&
603: current->dst.mask == policy->dst.mask &&
604: current->src.net->equals(current->src.net, policy->src.net) &&
605: current->dst.net->equals(current->dst.net, policy->dst.net);
606: }
607:
608: CALLBACK(policy_entry_match_byindex, bool,
609: policy_entry_t *current, va_list args)
610: {
611: uint32_t index;
612:
613: VA_ARGS_VGET(args, index);
614: return current->index == index;
615: }
616:
617: /**
618: * Calculate the priority of a policy
619: *
620: * This is the same formula we use in the kernel-netlink interface, but some
621: * features are currently not or only partially supported by PF_KEY.
622: *
623: * bits 0-0: separate trap and regular policies (0..1) 1 bit
624: * bits 1-1: reserved for interface restriction (0..1) 1 bit
625: * bits 2-7: src + dst port mask bits (2 * 0..16) 6 bits
626: * bits 8-8: restriction to protocol (0..1) 1 bit
627: * bits 9-17: src + dst network mask bits (2 * 0..128) 9 bits
628: * 18 bits
629: *
630: * smallest value: 000000000 0 000000 0 0: 0, lowest priority = 100'000
631: * largest value : 100000000 1 100000 0 1: 131'457, highst priority = 68'543
632: */
633: static inline uint32_t get_priority(policy_entry_t *policy,
634: policy_priority_t prio)
635: {
636: uint32_t priority = PRIO_BASE;
637:
638: switch (prio)
639: {
640: case POLICY_PRIORITY_FALLBACK:
641: priority += PRIO_BASE;
642: /* fall-through */
643: case POLICY_PRIORITY_ROUTED:
644: case POLICY_PRIORITY_DEFAULT:
645: priority += PRIO_BASE;
646: /* fall-through */
647: case POLICY_PRIORITY_PASS:
648: break;
649: }
650:
651: /* calculate priority */
652: priority -= (policy->src.mask + policy->dst.mask) * 512;
653: priority -= policy->src.proto != IPSEC_PROTO_ANY ? 256 : 0;
654: priority -= policy->src.net->get_port(policy->src.net) ? 64 : 0;
655: priority -= policy->dst.net->get_port(policy->dst.net) ? 64 : 0;
656: priority -= (prio != POLICY_PRIORITY_ROUTED);
657: return priority;
658: }
659:
660: typedef struct pfkey_msg_t pfkey_msg_t;
661:
662: struct pfkey_msg_t
663: {
664: /**
665: * PF_KEY message base
666: */
667: struct sadb_msg *msg;
668:
669: /**
670: * PF_KEY message extensions
671: */
672: union {
673: struct sadb_ext *ext[SADB_EXT_MAX + 1];
674: struct {
675: struct sadb_ext *reserved; /* SADB_EXT_RESERVED */
676: struct sadb_sa *sa; /* SADB_EXT_SA */
677: struct sadb_lifetime *lft_current; /* SADB_EXT_LIFETIME_CURRENT */
678: struct sadb_lifetime *lft_hard; /* SADB_EXT_LIFETIME_HARD */
679: struct sadb_lifetime *lft_soft; /* SADB_EXT_LIFETIME_SOFT */
680: struct sadb_address *src; /* SADB_EXT_ADDRESS_SRC */
681: struct sadb_address *dst; /* SADB_EXT_ADDRESS_DST */
682: struct sadb_address *proxy; /* SADB_EXT_ADDRESS_PROXY */
683: struct sadb_key *key_auth; /* SADB_EXT_KEY_AUTH */
684: struct sadb_key *key_encr; /* SADB_EXT_KEY_ENCRYPT */
685: struct sadb_ident *id_src; /* SADB_EXT_IDENTITY_SRC */
686: struct sadb_ident *id_dst; /* SADB_EXT_IDENTITY_DST */
687: struct sadb_sens *sensitivity; /* SADB_EXT_SENSITIVITY */
688: struct sadb_prop *proposal; /* SADB_EXT_PROPOSAL */
689: struct sadb_supported *supported_auth; /* SADB_EXT_SUPPORTED_AUTH */
690: struct sadb_supported *supported_encr; /* SADB_EXT_SUPPORTED_ENCRYPT */
691: struct sadb_spirange *spirange; /* SADB_EXT_SPIRANGE */
692: struct sadb_x_kmprivate *x_kmprivate; /* SADB_X_EXT_KMPRIVATE */
693: struct sadb_x_policy *x_policy; /* SADB_X_EXT_POLICY */
694: struct sadb_x_sa2 *x_sa2; /* SADB_X_EXT_SA2 */
695: #if defined(__linux__) || defined (__FreeBSD__)
696: struct sadb_x_nat_t_type *x_natt_type; /* SADB_X_EXT_NAT_T_TYPE */
697: struct sadb_x_nat_t_port *x_natt_sport; /* SADB_X_EXT_NAT_T_SPORT */
698: struct sadb_x_nat_t_port *x_natt_dport; /* SADB_X_EXT_NAT_T_DPORT */
699: #ifdef __linux__
700: struct sadb_address *x_natt_oa; /* SADB_X_EXT_NAT_T_OA */
701: struct sadb_x_sec_ctx *x_sec_ctx; /* SADB_X_EXT_SEC_CTX */
702: struct sadb_x_kmaddress *x_kmaddress; /* SADB_X_EXT_KMADDRESS */
703: #else
704: struct sadb_address *x_natt_oai; /* SADB_X_EXT_NAT_T_OAI */
705: struct sadb_address *x_natt_oar; /* SADB_X_EXT_NAT_T_OAR */
706: #ifdef SADB_X_EXT_NAT_T_FRAG
707: struct sadb_x_nat_t_frag *x_natt_frag; /* SADB_X_EXT_NAT_T_FRAG */
708: #ifdef SADB_X_EXT_SA_REPLAY
709: struct sadb_x_sa_replay *x_replay; /* SADB_X_EXT_SA_REPLAY */
710: struct sadb_address *x_new_addr_src; /* SADB_X_EXT_NEW_ADDRESS_SRC */
711: struct sadb_address *x_new_addr_dst; /* SADB_X_EXT_NEW_ADDRESS_DST */
712: #endif
713: #endif
714: #endif /* __linux__ */
715: #endif /* __linux__ || __FreeBSD__ */
716: } __attribute__((__packed__));
717: };
718: };
719:
720: ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX,
721: "SADB_EXT_RESERVED",
722: "SADB_EXT_SA",
723: "SADB_EXT_LIFETIME_CURRENT",
724: "SADB_EXT_LIFETIME_HARD",
725: "SADB_EXT_LIFETIME_SOFT",
726: "SADB_EXT_ADDRESS_SRC",
727: "SADB_EXT_ADDRESS_DST",
728: "SADB_EXT_ADDRESS_PROXY",
729: "SADB_EXT_KEY_AUTH",
730: "SADB_EXT_KEY_ENCRYPT",
731: "SADB_EXT_IDENTITY_SRC",
732: "SADB_EXT_IDENTITY_DST",
733: "SADB_EXT_SENSITIVITY",
734: "SADB_EXT_PROPOSAL",
735: "SADB_EXT_SUPPORTED_AUTH",
736: "SADB_EXT_SUPPORTED_ENCRYPT",
737: "SADB_EXT_SPIRANGE",
738: "SADB_X_EXT_KMPRIVATE",
739: "SADB_X_EXT_POLICY",
740: "SADB_X_EXT_SA2",
741: #ifdef __APPLE__
742: "SADB_EXT_SESSION_ID",
743: "SADB_EXT_SASTAT",
744: "SADB_X_EXT_IPSECIF",
745: "SADB_X_EXT_ADDR_RANGE_SRC_START",
746: "SADB_X_EXT_ADDR_RANGE_SRC_END",
747: "SADB_X_EXT_ADDR_RANGE_DST_START",
748: "SADB_X_EXT_ADDR_RANGE_DST_END",
749: "SADB_EXT_MIGRATE_ADDRESS_SRC",
750: "SADB_EXT_MIGRATE_ADDRESS_DST",
751: "SADB_X_EXT_MIGRATE_IPSECIF",
752: #else
753: "SADB_X_EXT_NAT_T_TYPE",
754: "SADB_X_EXT_NAT_T_SPORT",
755: "SADB_X_EXT_NAT_T_DPORT",
756: #ifdef __linux__
757: "SADB_X_EXT_NAT_T_OA",
758: "SADB_X_EXT_SEC_CTX",
759: "SADB_X_EXT_KMADDRESS",
760: #else
761: "SADB_X_EXT_NAT_T_OAI",
762: "SADB_X_EXT_NAT_T_OAR",
763: "SADB_X_EXT_NAT_T_FRAG",
764: "SADB_X_EXT_SA_REPLAY",
765: "SADB_X_EXT_NEW_ADDRESS_SRC",
766: "SADB_X_EXT_NEW_ADDRESS_DST",
767: #endif /* __linux__ */
768: #endif /* __APPLE__ */
769: );
770:
771: /**
772: * convert a protocol identifier to the PF_KEY sa type
773: */
774: static uint8_t proto2satype(uint8_t proto)
775: {
776: switch (proto)
777: {
778: case IPPROTO_ESP:
779: return SADB_SATYPE_ESP;
780: case IPPROTO_AH:
781: return SADB_SATYPE_AH;
782: case IPPROTO_COMP:
783: return SADB_X_SATYPE_IPCOMP;
784: default:
785: return proto;
786: }
787: }
788:
789: /**
790: * convert a PF_KEY sa type to a protocol identifier
791: */
792: static uint8_t satype2proto(uint8_t satype)
793: {
794: switch (satype)
795: {
796: case SADB_SATYPE_ESP:
797: return IPPROTO_ESP;
798: case SADB_SATYPE_AH:
799: return IPPROTO_AH;
800: case SADB_X_SATYPE_IPCOMP:
801: return IPPROTO_COMP;
802: default:
803: return satype;
804: }
805: }
806:
807: /**
808: * convert the general ipsec mode to the one defined in ipsec.h
809: */
810: static uint8_t mode2kernel(ipsec_mode_t mode)
811: {
812: switch (mode)
813: {
814: case MODE_TRANSPORT:
815: return IPSEC_MODE_TRANSPORT;
816: case MODE_TUNNEL:
817: return IPSEC_MODE_TUNNEL;
818: #ifdef HAVE_IPSEC_MODE_BEET
819: case MODE_BEET:
820: return IPSEC_MODE_BEET;
821: #endif
822: default:
823: return mode;
824: }
825: }
826:
827: /**
828: * convert the general policy direction to the one defined in ipsec.h
829: */
830: static uint8_t dir2kernel(policy_dir_t dir)
831: {
832: switch (dir)
833: {
834: case POLICY_IN:
835: return IPSEC_DIR_INBOUND;
836: case POLICY_OUT:
837: return IPSEC_DIR_OUTBOUND;
838: #ifdef HAVE_IPSEC_DIR_FWD
839: case POLICY_FWD:
840: return IPSEC_DIR_FWD;
841: #endif
842: default:
843: return IPSEC_DIR_INVALID;
844: }
845: }
846:
847: /**
848: * convert the policy type to the one defined in ipsec.h
849: */
850: static inline uint16_t type2kernel(policy_type_t type)
851: {
852: switch (type)
853: {
854: case POLICY_IPSEC:
855: return IPSEC_POLICY_IPSEC;
856: case POLICY_PASS:
857: return IPSEC_POLICY_NONE;
858: case POLICY_DROP:
859: return IPSEC_POLICY_DISCARD;
860: }
861: return type;
862: }
863:
864: #ifdef SADB_X_MIGRATE
865: /**
866: * convert the policy direction in ipsec.h to the general one.
867: */
868: static policy_dir_t kernel2dir(uint8_t dir)
869: {
870: switch (dir)
871: {
872: case IPSEC_DIR_INBOUND:
873: return POLICY_IN;
874: case IPSEC_DIR_OUTBOUND:
875: return POLICY_OUT;
876: #ifdef HAVE_IPSEC_DIR_FWD
877: case IPSEC_DIR_FWD:
878: return POLICY_FWD;
879: #endif
880: default:
881: return dir;
882: }
883: }
884: #endif /*SADB_X_MIGRATE*/
885:
886: typedef struct kernel_algorithm_t kernel_algorithm_t;
887:
888: /**
889: * Mapping of IKEv2 algorithms to PF_KEY algorithms
890: */
891: struct kernel_algorithm_t {
892: /**
893: * Identifier specified in IKEv2
894: */
895: int ikev2;
896:
897: /**
898: * Identifier as defined in pfkeyv2.h
899: */
900: int kernel;
901: };
902:
903: #define END_OF_LIST -1
904:
905: /**
906: * Algorithms for encryption
907: */
908: static kernel_algorithm_t encryption_algs[] = {
909: /* {ENCR_DES_IV64, 0 }, */
910: {ENCR_DES, SADB_EALG_DESCBC },
911: {ENCR_3DES, SADB_EALG_3DESCBC },
912: /* {ENCR_RC5, 0 }, */
913: /* {ENCR_IDEA, 0 }, */
914: {ENCR_CAST, SADB_X_EALG_CASTCBC },
915: {ENCR_BLOWFISH, SADB_X_EALG_BLOWFISHCBC },
916: /* {ENCR_3IDEA, 0 }, */
917: /* {ENCR_DES_IV32, 0 }, */
918: {ENCR_NULL, SADB_EALG_NULL },
919: {ENCR_AES_CBC, SADB_X_EALG_AESCBC },
920: #ifdef SADB_X_EALG_AESCTR
921: {ENCR_AES_CTR, SADB_X_EALG_AESCTR },
922: #endif
923: /* {ENCR_AES_CCM_ICV8, SADB_X_EALG_AES_CCM_ICV8 }, */
924: /* {ENCR_AES_CCM_ICV12, SADB_X_EALG_AES_CCM_ICV12 }, */
925: /* {ENCR_AES_CCM_ICV16, SADB_X_EALG_AES_CCM_ICV16 }, */
926: #ifdef SADB_X_EALG_AES_GCM_ICV8 /* assume the others are defined too */
927: {ENCR_AES_GCM_ICV8, SADB_X_EALG_AES_GCM_ICV8 },
928: {ENCR_AES_GCM_ICV12, SADB_X_EALG_AES_GCM_ICV12 },
929: {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM_ICV16 },
930: #elif defined(SADB_X_EALG_AES_GCM) /* macOS */
931: {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM },
932: #endif
933: #ifdef SADB_X_EALG_CAMELLIACBC
934: {ENCR_CAMELLIA_CBC, SADB_X_EALG_CAMELLIACBC },
935: #endif
936: #ifdef SADB_X_EALG_CHACHA20POLY1305
937: {ENCR_CHACHA20_POLY1305, SADB_X_EALG_CHACHA20POLY1305},
938: #endif
939: {END_OF_LIST, 0 },
940: };
941:
942: /**
943: * Algorithms for integrity protection
944: */
945: static kernel_algorithm_t integrity_algs[] = {
946: {AUTH_HMAC_MD5_96, SADB_AALG_MD5HMAC },
947: {AUTH_HMAC_SHA1_96, SADB_AALG_SHA1HMAC },
948: {AUTH_HMAC_SHA2_256_128, SADB_X_AALG_SHA2_256HMAC },
949: {AUTH_HMAC_SHA2_384_192, SADB_X_AALG_SHA2_384HMAC },
950: {AUTH_HMAC_SHA2_512_256, SADB_X_AALG_SHA2_512HMAC },
951: /* {AUTH_DES_MAC, 0, }, */
952: /* {AUTH_KPDK_MD5, 0, }, */
953: #ifdef SADB_X_AALG_AES_XCBC_MAC
954: {AUTH_AES_XCBC_96, SADB_X_AALG_AES_XCBC_MAC, },
955: #endif
956: {END_OF_LIST, 0, },
957: };
958:
959: /**
960: * Algorithms for IPComp, unused yet
961: */
962: static kernel_algorithm_t compression_algs[] = {
963: /* {IPCOMP_OUI, 0 }, */
964: {IPCOMP_DEFLATE, SADB_X_CALG_DEFLATE },
965: #ifdef SADB_X_CALG_LZS
966: {IPCOMP_LZS, SADB_X_CALG_LZS },
967: #endif
968: #ifdef SADB_X_CALG_LZJH
969: {IPCOMP_LZJH, SADB_X_CALG_LZJH },
970: #endif
971: {END_OF_LIST, 0 },
972: };
973:
974: /**
975: * Look up a kernel algorithm ID and its key size
976: */
977: static int lookup_algorithm(transform_type_t type, int ikev2)
978: {
979: kernel_algorithm_t *list;
980: uint16_t alg = 0;
981:
982: switch (type)
983: {
984: case ENCRYPTION_ALGORITHM:
985: list = encryption_algs;
986: break;
987: case INTEGRITY_ALGORITHM:
988: list = integrity_algs;
989: break;
990: case COMPRESSION_ALGORITHM:
991: list = compression_algs;
992: break;
993: default:
994: return 0;
995: }
996: while (list->ikev2 != END_OF_LIST)
997: {
998: if (ikev2 == list->ikev2)
999: {
1000: return list->kernel;
1001: }
1002: list++;
1003: }
1004: charon->kernel->lookup_algorithm(charon->kernel, ikev2, type, &alg, NULL);
1005: return alg;
1006: }
1007:
1008: /**
1009: * Helper to set a port in a sockaddr_t, the port has to be in host order
1010: */
1011: static void set_port(sockaddr_t *addr, uint16_t port)
1012: {
1013: switch (addr->sa_family)
1014: {
1015: case AF_INET:
1016: {
1017: struct sockaddr_in *sin = (struct sockaddr_in*)addr;
1018: sin->sin_port = htons(port);
1019: break;
1020: }
1021: case AF_INET6:
1022: {
1023: struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)addr;
1024: sin6->sin6_port = htons(port);
1025: break;
1026: }
1027: }
1028: }
1029:
1030: /**
1031: * Copy a host_t as sockaddr_t to the given memory location.
1032: * @return the number of bytes copied
1033: */
1034: static size_t hostcpy(void *dest, host_t *host, bool include_port)
1035: {
1036: sockaddr_t *addr = host->get_sockaddr(host), *dest_addr = dest;
1037: socklen_t *len = host->get_sockaddr_len(host);
1038:
1039: memcpy(dest, addr, *len);
1040: #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1041: dest_addr->sa_len = *len;
1042: #endif
1043: if (!include_port)
1044: {
1045: set_port(dest_addr, 0);
1046: }
1047: return *len;
1048: }
1049:
1050: /**
1051: * add a host to the given sadb_msg
1052: */
1053: static void add_addr_ext(struct sadb_msg *msg, host_t *host, uint16_t type,
1054: uint8_t proto, uint8_t prefixlen, bool include_port)
1055: {
1056: struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg);
1057: size_t len;
1058:
1059: addr->sadb_address_exttype = type;
1060: addr->sadb_address_proto = proto;
1061: addr->sadb_address_prefixlen = prefixlen;
1062: len = hostcpy(addr + 1, host, include_port);
1063: addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len);
1064: PFKEY_EXT_ADD(msg, addr);
1065: }
1066:
1067: #ifdef HAVE_NATT
1068: /**
1069: * add udp encap extensions to a sadb_msg
1070: */
1071: static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst)
1072: {
1073: struct sadb_x_nat_t_type* nat_type;
1074: struct sadb_x_nat_t_port* nat_port;
1075:
1076: nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg);
1077: nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1078: nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(*nat_type));
1079: nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP;
1080: PFKEY_EXT_ADD(msg, nat_type);
1081:
1082: nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1083: nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1084: nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1085: nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src));
1086: PFKEY_EXT_ADD(msg, nat_port);
1087:
1088: nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg);
1089: nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1090: nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port));
1091: nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst));
1092: PFKEY_EXT_ADD(msg, nat_port);
1093: }
1094: #endif /*HAVE_NATT*/
1095:
1096: /**
1097: * Convert a sadb_address to a traffic_selector
1098: */
1099: static traffic_selector_t* sadb_address2ts(struct sadb_address *address)
1100: {
1101: traffic_selector_t *ts;
1102: host_t *host;
1103: uint8_t proto;
1104:
1105: proto = address->sadb_address_proto;
1106: proto = proto == IPSEC_PROTO_ANY ? 0 : proto;
1107:
1108: /* The Linux 2.6 kernel does not set the protocol and port information
1109: * in the src and dst sadb_address extensions of the SADB_ACQUIRE message.
1110: */
1111: host = host_create_from_sockaddr((sockaddr_t*)&address[1]);
1112: ts = traffic_selector_create_from_subnet(host,
1113: address->sadb_address_prefixlen,
1114: proto, host->get_port(host),
1115: host->get_port(host) ?: 65535);
1116: return ts;
1117: }
1118:
1119: /**
1120: * Parses a pfkey message received from the kernel
1121: */
1122: static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out)
1123: {
1124: struct sadb_ext* ext;
1125: size_t len;
1126:
1127: memset(out, 0, sizeof(pfkey_msg_t));
1128: out->msg = msg;
1129:
1130: len = msg->sadb_msg_len;
1131: len -= PFKEY_LEN(sizeof(struct sadb_msg));
1132:
1133: ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg));
1134:
1135: while (len >= PFKEY_LEN(sizeof(struct sadb_ext)))
1136: {
1137: DBG3(DBG_KNL, " %N", sadb_ext_type_names, ext->sadb_ext_type);
1138: if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) ||
1139: ext->sadb_ext_len > len)
1140: {
1141: DBG1(DBG_KNL, "length of %N extension is invalid",
1142: sadb_ext_type_names, ext->sadb_ext_type);
1143: break;
1144: }
1145:
1146: if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type))
1147: {
1148: DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid",
1149: ext->sadb_ext_type);
1150: break;
1151: }
1152:
1153: if (out->ext[ext->sadb_ext_type])
1154: {
1155: DBG1(DBG_KNL, "duplicate %N extension",
1156: sadb_ext_type_names, ext->sadb_ext_type);
1157: break;
1158: }
1159:
1160: out->ext[ext->sadb_ext_type] = ext;
1161: ext = PFKEY_EXT_NEXT_LEN(ext, len);
1162: }
1163:
1164: if (len)
1165: {
1166: DBG1(DBG_KNL, "PF_KEY message length is invalid");
1167: return FAILED;
1168: }
1169:
1170: return SUCCESS;
1171: }
1172:
1173: /**
1174: * Send a message to a specific PF_KEY socket and handle the response.
1175: */
1176: static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket,
1177: struct sadb_msg *in, struct sadb_msg **out, size_t *out_len)
1178: {
1179: unsigned char buf[PFKEY_BUFFER_SIZE];
1180: struct sadb_msg *msg;
1181: int in_len, len;
1182:
1183: this->mutex_pfkey->lock(this->mutex_pfkey);
1184:
1185: /* the kernel may broadcast messages not related to our requests (e.g. when
1186: * managing SAs and policies via an external tool), so let's clear the
1187: * receive buffer so there is room for our request and its reply. */
1188: while (TRUE)
1189: {
1190: len = recv(socket, buf, sizeof(buf), MSG_DONTWAIT);
1191:
1192: if (len < 0)
1193: {
1194: if (errno == EINTR)
1195: { /* interrupted, try again */
1196: continue;
1197: }
1198: break;
1199: }
1200: }
1201:
1202: /* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367,
1203: * in particular the behavior in response to an SADB_ACQUIRE. */
1204: in->sadb_msg_seq = ++this->seq;
1205: in->sadb_msg_pid = getpid();
1206:
1207: in_len = PFKEY_USER_LEN(in->sadb_msg_len);
1208:
1209: while (TRUE)
1210: {
1211: len = send(socket, in, in_len, 0);
1212:
1213: if (len != in_len)
1214: {
1215: if (errno == EINTR)
1216: {
1217: /* interrupted, try again */
1218: continue;
1219: }
1220: this->mutex_pfkey->unlock(this->mutex_pfkey);
1221: DBG1(DBG_KNL, "error sending to PF_KEY socket: %s",
1222: strerror(errno));
1223: return FAILED;
1224: }
1225: break;
1226: }
1227:
1228: while (TRUE)
1229: {
1230: msg = (struct sadb_msg*)buf;
1231:
1232: len = recv(socket, buf, sizeof(buf), 0);
1233:
1234: if (len < 0)
1235: {
1236: if (errno == EINTR)
1237: {
1238: DBG1(DBG_KNL, "got interrupted");
1239: /* interrupted, try again */
1240: continue;
1241: }
1242: DBG1(DBG_KNL, "error reading from PF_KEY socket: %s",
1243: strerror(errno));
1244: this->mutex_pfkey->unlock(this->mutex_pfkey);
1245: return FAILED;
1246: }
1247: if (len < sizeof(struct sadb_msg) ||
1248: msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1249: {
1250: DBG1(DBG_KNL, "received corrupted PF_KEY message");
1251: this->mutex_pfkey->unlock(this->mutex_pfkey);
1252: return FAILED;
1253: }
1254: if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1255: {
1256: DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY "
1257: "message");
1258: this->mutex_pfkey->unlock(this->mutex_pfkey);
1259: return FAILED;
1260: }
1261: if (msg->sadb_msg_pid != in->sadb_msg_pid)
1262: {
1263: DBG2(DBG_KNL, "received PF_KEY message is not intended for us");
1264: continue;
1265: }
1266: if (msg->sadb_msg_seq != this->seq)
1267: {
1268: DBG2(DBG_KNL, "received PF_KEY message with unexpected sequence "
1269: "number, was %d expected %d", msg->sadb_msg_seq,
1270: this->seq);
1271: if (msg->sadb_msg_seq == 0)
1272: {
1273: /* FreeBSD and Mac OS X do this for the response to
1274: * SADB_X_SPDGET (but not for the response to SADB_GET).
1275: * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */
1276: }
1277: else if (msg->sadb_msg_seq < this->seq)
1278: {
1279: continue;
1280: }
1281: else
1282: {
1283: this->mutex_pfkey->unlock(this->mutex_pfkey);
1284: return FAILED;
1285: }
1286: }
1287: if (msg->sadb_msg_type != in->sadb_msg_type)
1288: {
1289: DBG2(DBG_KNL, "received PF_KEY message of wrong type, "
1290: "was %d expected %d, ignoring", msg->sadb_msg_type,
1291: in->sadb_msg_type);
1292: }
1293: break;
1294: }
1295:
1296: *out_len = len;
1297: *out = (struct sadb_msg*)malloc(len);
1298: memcpy(*out, buf, len);
1299:
1300: this->mutex_pfkey->unlock(this->mutex_pfkey);
1301: return SUCCESS;
1302: }
1303:
1304: /**
1305: * Send a message to the default PF_KEY socket and handle the response.
1306: */
1307: static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this,
1308: struct sadb_msg *in, struct sadb_msg **out,
1309: size_t *out_len)
1310: {
1311: return pfkey_send_socket(this, this->socket, in, out, out_len);
1312: }
1313:
1314: /**
1315: * Process a SADB_ACQUIRE message from the kernel
1316: */
1317: static void process_acquire(private_kernel_pfkey_ipsec_t *this,
1318: struct sadb_msg* msg)
1319: {
1320: pfkey_msg_t response;
1321: uint32_t index, reqid = 0;
1322: traffic_selector_t *src_ts, *dst_ts;
1323: policy_entry_t *policy;
1324: policy_sa_t *sa;
1325:
1326: switch (msg->sadb_msg_satype)
1327: {
1328: case SADB_SATYPE_UNSPEC:
1329: case SADB_SATYPE_ESP:
1330: case SADB_SATYPE_AH:
1331: break;
1332: default:
1333: /* acquire for AH/ESP only */
1334: return;
1335: }
1336: DBG2(DBG_KNL, "received an SADB_ACQUIRE");
1337:
1338: if (parse_pfkey_message(msg, &response) != SUCCESS)
1339: {
1340: DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed");
1341: return;
1342: }
1343:
1344: if (response.x_sa2)
1345: {
1346: reqid = response.x_sa2->sadb_x_sa2_reqid;
1347: }
1348: else
1349: {
1350: index = response.x_policy->sadb_x_policy_id;
1351: this->mutex->lock(this->mutex);
1352: if (this->policies->find_first(this->policies, policy_entry_match_byindex,
1353: (void**)&policy, index) &&
1354: policy->used_by->get_first(policy->used_by, (void**)&sa) == SUCCESS)
1355: {
1356: reqid = sa->sa->cfg.reqid;
1357: }
1358: else
1359: {
1360: DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no "
1361: "matching policy found", index);
1362: }
1363: this->mutex->unlock(this->mutex);
1364: }
1365:
1366: src_ts = sadb_address2ts(response.src);
1367: dst_ts = sadb_address2ts(response.dst);
1368:
1369: charon->kernel->acquire(charon->kernel, reqid, src_ts, dst_ts);
1370: }
1371:
1372: /**
1373: * Process a SADB_EXPIRE message from the kernel
1374: */
1375: static void process_expire(private_kernel_pfkey_ipsec_t *this,
1376: struct sadb_msg* msg)
1377: {
1378: pfkey_msg_t response;
1379: uint8_t protocol;
1380: uint32_t spi;
1381: host_t *dst;
1382: bool hard;
1383:
1384: DBG2(DBG_KNL, "received an SADB_EXPIRE");
1385:
1386: if (parse_pfkey_message(msg, &response) != SUCCESS)
1387: {
1388: DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed");
1389: return;
1390: }
1391:
1392: protocol = satype2proto(msg->sadb_msg_satype);
1393: spi = response.sa->sadb_sa_spi;
1394: hard = response.lft_hard != NULL;
1395:
1396: if (protocol == IPPROTO_ESP || protocol == IPPROTO_AH)
1397: {
1398: dst = host_create_from_sockaddr((sockaddr_t*)(response.dst + 1));
1399: if (dst)
1400: {
1401: charon->kernel->expire(charon->kernel, protocol, spi, dst, hard);
1402: dst->destroy(dst);
1403: }
1404: }
1405: }
1406:
1407: #ifdef SADB_X_MIGRATE
1408: /**
1409: * Process a SADB_X_MIGRATE message from the kernel
1410: */
1411: static void process_migrate(private_kernel_pfkey_ipsec_t *this,
1412: struct sadb_msg* msg)
1413: {
1414: pfkey_msg_t response;
1415: traffic_selector_t *src_ts, *dst_ts;
1416: policy_dir_t dir;
1417: uint32_t reqid = 0;
1418: host_t *local = NULL, *remote = NULL;
1419:
1420: DBG2(DBG_KNL, "received an SADB_X_MIGRATE");
1421:
1422: if (parse_pfkey_message(msg, &response) != SUCCESS)
1423: {
1424: DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed");
1425: return;
1426: }
1427: src_ts = sadb_address2ts(response.src);
1428: dst_ts = sadb_address2ts(response.dst);
1429: dir = kernel2dir(response.x_policy->sadb_x_policy_dir);
1430: DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts,
1431: policy_dir_names, dir);
1432:
1433: /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */
1434: if (response.x_kmaddress)
1435: {
1436: sockaddr_t *local_addr, *remote_addr;
1437: uint32_t local_len;
1438:
1439: local_addr = (sockaddr_t*)&response.x_kmaddress[1];
1440: local = host_create_from_sockaddr(local_addr);
1441: local_len = (local_addr->sa_family == AF_INET6)?
1442: sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
1443: remote_addr = (sockaddr_t*)((uint8_t*)local_addr + local_len);
1444: remote = host_create_from_sockaddr(remote_addr);
1445: DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote);
1446: }
1447:
1448: if (src_ts && dst_ts && local && remote)
1449: {
1450: charon->kernel->migrate(charon->kernel, reqid, src_ts, dst_ts, dir,
1451: local, remote);
1452: }
1453: else
1454: {
1455: DESTROY_IF(src_ts);
1456: DESTROY_IF(dst_ts);
1457: DESTROY_IF(local);
1458: DESTROY_IF(remote);
1459: }
1460: }
1461: #endif /*SADB_X_MIGRATE*/
1462:
1463: #ifdef SADB_X_NAT_T_NEW_MAPPING
1464: /**
1465: * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel
1466: */
1467: static void process_mapping(private_kernel_pfkey_ipsec_t *this,
1468: struct sadb_msg* msg)
1469: {
1470: pfkey_msg_t response;
1471: uint32_t spi;
1472: sockaddr_t *sa;
1473: host_t *dst, *new;
1474:
1475: DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING");
1476:
1477: if (parse_pfkey_message(msg, &response) != SUCCESS)
1478: {
1479: DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed");
1480: return;
1481: }
1482:
1483: if (!response.x_sa2)
1484: {
1485: DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required "
1486: "information");
1487: return;
1488: }
1489:
1490: spi = response.sa->sadb_sa_spi;
1491:
1492: if (satype2proto(msg->sadb_msg_satype) != IPPROTO_ESP)
1493: {
1494: return;
1495: }
1496:
1497: sa = (sockaddr_t*)(response.dst + 1);
1498: dst = host_create_from_sockaddr(sa);
1499: switch (sa->sa_family)
1500: {
1501: case AF_INET:
1502: {
1503: struct sockaddr_in *sin = (struct sockaddr_in*)sa;
1504: sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1505: break;
1506: }
1507: case AF_INET6:
1508: {
1509: struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
1510: sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port);
1511: break;
1512: }
1513: default:
1514: break;
1515: }
1516: if (dst)
1517: {
1518: new = host_create_from_sockaddr(sa);
1519: if (new)
1520: {
1521: charon->kernel->mapping(charon->kernel, IPPROTO_ESP, spi, dst, new);
1522: new->destroy(new);
1523: }
1524: dst->destroy(dst);
1525: }
1526: }
1527: #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1528:
1529: /**
1530: * Receives events from kernel
1531: */
1532: static bool receive_events(private_kernel_pfkey_ipsec_t *this, int fd,
1533: watcher_event_t event)
1534: {
1535: unsigned char buf[PFKEY_BUFFER_SIZE];
1536: struct sadb_msg *msg = (struct sadb_msg*)buf;
1537: int len;
1538:
1539: len = recvfrom(this->socket_events, buf, sizeof(buf), MSG_DONTWAIT, NULL, 0);
1540: if (len < 0)
1541: {
1542: switch (errno)
1543: {
1544: case EINTR:
1545: /* interrupted, try again */
1546: return TRUE;
1547: case EAGAIN:
1548: /* no data ready, select again */
1549: return TRUE;
1550: default:
1551: DBG1(DBG_KNL, "unable to receive from PF_KEY event socket");
1552: sleep(1);
1553: return TRUE;
1554: }
1555: }
1556:
1557: if (len < sizeof(struct sadb_msg) ||
1558: msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg)))
1559: {
1560: DBG2(DBG_KNL, "received corrupted PF_KEY message");
1561: return TRUE;
1562: }
1563: if (msg->sadb_msg_pid != 0)
1564: { /* not from kernel. not interested, try another one */
1565: return TRUE;
1566: }
1567: if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT)
1568: {
1569: DBG1(DBG_KNL, "buffer was too small to receive the complete "
1570: "PF_KEY message");
1571: return TRUE;
1572: }
1573:
1574: switch (msg->sadb_msg_type)
1575: {
1576: case SADB_ACQUIRE:
1577: process_acquire(this, msg);
1578: break;
1579: case SADB_EXPIRE:
1580: process_expire(this, msg);
1581: break;
1582: #ifdef SADB_X_MIGRATE
1583: case SADB_X_MIGRATE:
1584: process_migrate(this, msg);
1585: break;
1586: #endif /*SADB_X_MIGRATE*/
1587: #ifdef SADB_X_NAT_T_NEW_MAPPING
1588: case SADB_X_NAT_T_NEW_MAPPING:
1589: process_mapping(this, msg);
1590: break;
1591: #endif /*SADB_X_NAT_T_NEW_MAPPING*/
1592: default:
1593: break;
1594: }
1595:
1596: return TRUE;
1597: }
1598:
1599: /**
1600: * Get an SPI for a specific protocol from the kernel.
1601: */
1602:
1603: static status_t get_spi_internal(private_kernel_pfkey_ipsec_t *this,
1604: host_t *src, host_t *dst, uint8_t proto, uint32_t min, uint32_t max,
1605: uint32_t *spi)
1606: {
1607: unsigned char request[PFKEY_BUFFER_SIZE];
1608: struct sadb_msg *msg, *out;
1609: struct sadb_spirange *range;
1610: pfkey_msg_t response;
1611: uint32_t received_spi = 0;
1612: size_t len;
1613:
1614: memset(&request, 0, sizeof(request));
1615:
1616: msg = (struct sadb_msg*)request;
1617: msg->sadb_msg_version = PF_KEY_V2;
1618: msg->sadb_msg_type = SADB_GETSPI;
1619: msg->sadb_msg_satype = proto2satype(proto);
1620: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1621:
1622: add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1623: add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1624:
1625: range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg);
1626: range->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
1627: range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1628: range->sadb_spirange_min = min;
1629: range->sadb_spirange_max = max;
1630: PFKEY_EXT_ADD(msg, range);
1631:
1632: if (pfkey_send(this, msg, &out, &len) == SUCCESS)
1633: {
1634: if (out->sadb_msg_errno)
1635: {
1636: DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
1637: strerror(out->sadb_msg_errno), out->sadb_msg_errno);
1638: }
1639: else if (parse_pfkey_message(out, &response) == SUCCESS)
1640: {
1641: received_spi = response.sa->sadb_sa_spi;
1642: }
1643: free(out);
1644: }
1645:
1646: if (received_spi == 0)
1647: {
1648: return FAILED;
1649: }
1650:
1651: *spi = received_spi;
1652: return SUCCESS;
1653: }
1654:
1655: METHOD(kernel_ipsec_t, get_spi, status_t,
1656: private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1657: uint8_t protocol, uint32_t *spi)
1658: {
1659: uint32_t spi_min, spi_max;
1660:
1661: spi_min = lib->settings->get_int(lib->settings, "%s.spi_min",
1662: KERNEL_SPI_MIN, lib->ns);
1663: spi_max = lib->settings->get_int(lib->settings, "%s.spi_max",
1664: KERNEL_SPI_MAX, lib->ns);
1665:
1666: if (get_spi_internal(this, src, dst, protocol, min(spi_min, spi_max),
1667: max(spi_min, spi_max), spi) != SUCCESS)
1668: {
1669: DBG1(DBG_KNL, "unable to get SPI");
1670: return FAILED;
1671: }
1672:
1673: DBG2(DBG_KNL, "got SPI %.8x", ntohl(*spi));
1674: return SUCCESS;
1675: }
1676:
1677: METHOD(kernel_ipsec_t, get_cpi, status_t,
1678: private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst,
1679: uint16_t *cpi)
1680: {
1681: uint32_t received_spi = 0;
1682:
1683: DBG2(DBG_KNL, "getting CPI");
1684:
1685: if (get_spi_internal(this, src, dst, IPPROTO_COMP,
1686: 0x100, 0xEFFF, &received_spi) != SUCCESS)
1687: {
1688: DBG1(DBG_KNL, "unable to get CPI");
1689: return FAILED;
1690: }
1691:
1692: *cpi = htons((uint16_t)ntohl(received_spi));
1693:
1694: DBG2(DBG_KNL, "got CPI %.4x", ntohs(*cpi));
1695: return SUCCESS;
1696: }
1697:
1698: METHOD(kernel_ipsec_t, add_sa, status_t,
1699: private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id,
1700: kernel_ipsec_add_sa_t *data)
1701: {
1702: unsigned char request[PFKEY_BUFFER_SIZE];
1703: struct sadb_msg *msg, *out;
1704: struct sadb_sa *sa;
1705: struct sadb_x_sa2 *sa2;
1706: struct sadb_lifetime *lft;
1707: struct sadb_key *key;
1708: size_t len;
1709: uint16_t ipcomp = data->ipcomp;
1710: ipsec_mode_t mode = data->mode;
1711:
1712: /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0
1713: * we are in the recursive call below */
1714: if (ipcomp != IPCOMP_NONE && data->cpi != 0)
1715: {
1716: lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}};
1717: kernel_ipsec_sa_id_t ipcomp_id = {
1718: .src = id->src,
1719: .dst = id->dst,
1720: .spi = htonl(ntohs(data->cpi)),
1721: .proto = IPPROTO_COMP,
1722: .mark = id->mark,
1723: };
1724: kernel_ipsec_add_sa_t ipcomp_sa = {
1725: .reqid = data->reqid,
1726: .mode = data->mode,
1727: .src_ts = data->src_ts,
1728: .dst_ts = data->dst_ts,
1729: .lifetime = &lft,
1730: .enc_alg = ENCR_UNDEFINED,
1731: .int_alg = AUTH_UNDEFINED,
1732: .tfc = data->tfc,
1733: .ipcomp = data->ipcomp,
1734: .initiator = data->initiator,
1735: .inbound = data->inbound,
1736: .update = data->update,
1737: };
1738: add_sa(this, &ipcomp_id, &ipcomp_sa);
1739: ipcomp = IPCOMP_NONE;
1740: /* use transport mode ESP SA, IPComp uses tunnel mode */
1741: mode = MODE_TRANSPORT;
1742: }
1743:
1744: if (data->update)
1745: {
1746: /* As we didn't know the reqid during SPI allocation, we used reqid
1747: * zero. Unfortunately we can't SADB_UPDATE to the new reqid, hence we
1748: * have to delete the SPI allocation state manually. The reqid
1749: * selector does not count for that, therefore we have to delete
1750: * that state before installing the new SA to avoid deleting the
1751: * the new state after installing it. */
1752: kernel_ipsec_sa_id_t del_id = {
1753: .src = id->src,
1754: .dst = id->dst,
1755: .spi = id->spi,
1756: .proto = id->proto,
1757: };
1758: kernel_ipsec_del_sa_t del = { 0 };
1759:
1760: if (this->public.interface.del_sa(&this->public.interface, &del_id,
1761: &del) != SUCCESS)
1762: {
1763: DBG1(DBG_KNL, "deleting SPI allocation SA failed");
1764: }
1765: }
1766:
1767: memset(&request, 0, sizeof(request));
1768:
1769: DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}",
1770: ntohl(id->spi), data->reqid);
1771:
1772: msg = (struct sadb_msg*)request;
1773: msg->sadb_msg_version = PF_KEY_V2;
1774: msg->sadb_msg_type = SADB_ADD;
1775: msg->sadb_msg_satype = proto2satype(id->proto);
1776: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1777:
1778: #ifdef __APPLE__
1779: if (data->encap)
1780: {
1781: struct sadb_sa_2 *sa_2;
1782: sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
1783: sa_2->sadb_sa_natt_port = id->dst->get_port(id->dst);
1784: sa = &sa_2->sa;
1785: sa->sadb_sa_flags |= SADB_X_EXT_NATT;
1786: len = sizeof(struct sadb_sa_2);
1787: }
1788: else
1789: #endif
1790: {
1791: sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1792: len = sizeof(struct sadb_sa);
1793: }
1794: sa->sadb_sa_exttype = SADB_EXT_SA;
1795: sa->sadb_sa_len = PFKEY_LEN(len);
1796: sa->sadb_sa_spi = id->spi;
1797: sa->sadb_sa_state = SADB_SASTATE_MATURE;
1798: if (id->proto == IPPROTO_COMP)
1799: {
1800: sa->sadb_sa_encrypt = lookup_algorithm(COMPRESSION_ALGORITHM,
1801: ipcomp);
1802: }
1803: else
1804: {
1805: /* Linux interprets sadb_sa_replay as number of packets/bits in the
1806: * replay window, whereas on BSD it's the size of the window in bytes.
1807: * Only set for the inbound SA as it's not relevant for the outbound
1808: * SA and might waste memory with large windows. */
1809: if (data->inbound)
1810: {
1811: #ifdef __linux__
1812: sa->sadb_sa_replay = min(data->replay_window, 32);
1813: #else
1814: sa->sadb_sa_replay = min((data->replay_window + 7) / 8, UINT8_MAX);
1815: #endif
1816: }
1817: if (data->esn)
1818: {
1819: #ifdef SADB_X_SAFLAGS_ESN
1820: DBG2(DBG_KNL, " using extended sequence numbers (ESN)");
1821: sa->sadb_sa_flags |= SADB_X_SAFLAGS_ESN;
1822: #else
1823: DBG1(DBG_KNL, "extended sequence numbers (ESN) not supported by "
1824: "kernel!");
1825: return FAILED;
1826: #endif
1827: }
1828: sa->sadb_sa_auth = lookup_algorithm(INTEGRITY_ALGORITHM, data->int_alg);
1829: sa->sadb_sa_encrypt = lookup_algorithm(ENCRYPTION_ALGORITHM,
1830: data->enc_alg);
1831: }
1832: PFKEY_EXT_ADD(msg, sa);
1833:
1834: #ifdef SADB_X_EXT_SA_REPLAY
1835: if (data->inbound)
1836: {
1837: struct sadb_x_sa_replay *repl;
1838:
1839: repl = (struct sadb_x_sa_replay*)PFKEY_EXT_ADD_NEXT(msg);
1840: repl->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY;
1841: repl->sadb_x_sa_replay_len = PFKEY_LEN(sizeof(struct sadb_x_sa_replay));
1842: repl->sadb_x_sa_replay_replay = min(data->replay_window, UINT32_MAX-32);
1843: PFKEY_EXT_ADD(msg, repl);
1844: }
1845: #endif
1846:
1847: sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg);
1848: sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1849: sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange));
1850: sa2->sadb_x_sa2_mode = mode2kernel(mode);
1851: sa2->sadb_x_sa2_reqid = data->reqid;
1852: PFKEY_EXT_ADD(msg, sa2);
1853:
1854: add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
1855: add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
1856:
1857: lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1858: lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1859: lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1860: lft->sadb_lifetime_allocations = data->lifetime->packets.rekey;
1861: lft->sadb_lifetime_bytes = data->lifetime->bytes.rekey;
1862: lft->sadb_lifetime_addtime = data->lifetime->time.rekey;
1863: lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1864: PFKEY_EXT_ADD(msg, lft);
1865:
1866: lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
1867: lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1868: lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
1869: lft->sadb_lifetime_allocations = data->lifetime->packets.life;
1870: lft->sadb_lifetime_bytes = data->lifetime->bytes.life;
1871: lft->sadb_lifetime_addtime = data->lifetime->time.life;
1872: lft->sadb_lifetime_usetime = 0; /* we only use addtime */
1873: PFKEY_EXT_ADD(msg, lft);
1874:
1875: if (data->enc_alg != ENCR_UNDEFINED)
1876: {
1877: if (!sa->sadb_sa_encrypt)
1878: {
1879: DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1880: encryption_algorithm_names, data->enc_alg);
1881: return FAILED;
1882: }
1883: DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
1884: encryption_algorithm_names, data->enc_alg, data->enc_key.len * 8);
1885:
1886: key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1887: key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
1888: key->sadb_key_bits = data->enc_key.len * 8;
1889: key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + data->enc_key.len);
1890: memcpy(key + 1, data->enc_key.ptr, data->enc_key.len);
1891:
1892: PFKEY_EXT_ADD(msg, key);
1893: }
1894:
1895: if (data->int_alg != AUTH_UNDEFINED)
1896: {
1897: if (!sa->sadb_sa_auth)
1898: {
1899: DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
1900: integrity_algorithm_names, data->int_alg);
1901: return FAILED;
1902: }
1903: DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
1904: integrity_algorithm_names, data->int_alg, data->int_key.len * 8);
1905:
1906: key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg);
1907: key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
1908: key->sadb_key_bits = data->int_key.len * 8;
1909: key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + data->int_key.len);
1910: memcpy(key + 1, data->int_key.ptr, data->int_key.len);
1911:
1912: PFKEY_EXT_ADD(msg, key);
1913: }
1914:
1915: #ifdef HAVE_NATT
1916: if (data->encap)
1917: {
1918: add_encap_ext(msg, id->src, id->dst);
1919: }
1920: #endif /*HAVE_NATT*/
1921:
1922: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
1923: {
1924: DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x",
1925: ntohl(id->spi));
1926: return FAILED;
1927: }
1928: else if (out->sadb_msg_errno)
1929: {
1930: DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)",
1931: ntohl(id->spi), strerror(out->sadb_msg_errno),
1932: out->sadb_msg_errno);
1933: free(out);
1934: return FAILED;
1935: }
1936:
1937: free(out);
1938: return SUCCESS;
1939: }
1940:
1941: METHOD(kernel_ipsec_t, update_sa, status_t,
1942: private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id,
1943: kernel_ipsec_update_sa_t *data)
1944: {
1945: unsigned char request[PFKEY_BUFFER_SIZE];
1946: struct sadb_msg *msg, *out;
1947: struct sadb_sa *sa;
1948: pfkey_msg_t response;
1949: size_t len;
1950:
1951: #ifndef SADB_X_EXT_NEW_ADDRESS_SRC
1952: /* we can't update the SA if any of the ip addresses have changed.
1953: * that's because we can't use SADB_UPDATE and by deleting and readding the
1954: * SA the sequence numbers would get lost */
1955: if (!id->src->ip_equals(id->src, data->new_src) ||
1956: !id->dst->ip_equals(id->dst, data->new_dst))
1957: {
1958: DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address "
1959: "changes are not supported", ntohl(id->spi));
1960: return NOT_SUPPORTED;
1961: }
1962: #endif /*SADB_X_EXT_NEW_ADDRESS_SRC*/
1963:
1964: /* if IPComp is used, we first update the IPComp SA */
1965: if (data->cpi)
1966: {
1967: kernel_ipsec_sa_id_t ipcomp_id = {
1968: .src = id->src,
1969: .dst = id->dst,
1970: .spi = htonl(ntohs(data->cpi)),
1971: .proto = IPPROTO_COMP,
1972: .mark = id->mark,
1973: };
1974: kernel_ipsec_update_sa_t ipcomp = {
1975: .new_src = data->new_src,
1976: .new_dst = data->new_dst,
1977: };
1978: update_sa(this, &ipcomp_id, &ipcomp);
1979: }
1980:
1981: memset(&request, 0, sizeof(request));
1982:
1983: DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update",
1984: ntohl(id->spi));
1985:
1986: msg = (struct sadb_msg*)request;
1987: msg->sadb_msg_version = PF_KEY_V2;
1988: msg->sadb_msg_type = SADB_GET;
1989: msg->sadb_msg_satype = proto2satype(id->proto);
1990: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
1991:
1992: sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
1993: sa->sadb_sa_exttype = SADB_EXT_SA;
1994: sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
1995: sa->sadb_sa_spi = id->spi;
1996: sa->sadb_sa_state = SADB_SASTATE_MATURE;
1997: PFKEY_EXT_ADD(msg, sa);
1998:
1999: add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
2000: add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
2001:
2002: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2003: {
2004: DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x",
2005: ntohl(id->spi));
2006: return FAILED;
2007: }
2008: else if (out->sadb_msg_errno)
2009: {
2010: DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
2011: ntohl(id->spi), strerror(out->sadb_msg_errno),
2012: out->sadb_msg_errno);
2013: free(out);
2014: return FAILED;
2015: }
2016: else if (parse_pfkey_message(out, &response) != SUCCESS)
2017: {
2018: DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing "
2019: "response from kernel failed", ntohl(id->spi));
2020: free(out);
2021: return FAILED;
2022: }
2023:
2024: DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
2025: ntohl(id->spi), id->src, id->dst, data->new_src, data->new_dst);
2026:
2027: memset(&request, 0, sizeof(request));
2028:
2029: msg = (struct sadb_msg*)request;
2030: msg->sadb_msg_version = PF_KEY_V2;
2031: msg->sadb_msg_type = SADB_UPDATE;
2032: msg->sadb_msg_satype = proto2satype(id->proto);
2033: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2034:
2035: #ifdef __APPLE__
2036: {
2037: struct sadb_sa_2 *sa_2;
2038: sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg);
2039: sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2));
2040: memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa));
2041: if (data->new_encap)
2042: {
2043: sa_2->sadb_sa_natt_port = data->new_dst->get_port(data->new_dst);
2044: sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT;
2045: }
2046: }
2047: #else
2048: PFKEY_EXT_COPY(msg, response.sa);
2049: #endif
2050: PFKEY_EXT_COPY(msg, response.x_sa2);
2051:
2052: PFKEY_EXT_COPY(msg, response.src);
2053: PFKEY_EXT_COPY(msg, response.dst);
2054:
2055: PFKEY_EXT_COPY(msg, response.lft_soft);
2056: PFKEY_EXT_COPY(msg, response.lft_hard);
2057:
2058: #ifndef __FreeBSD__
2059: /* FreeBSD 11.1 does not allow key updates via SADB_UPDATE for mature SAs */
2060: if (response.key_encr)
2061: {
2062: PFKEY_EXT_COPY(msg, response.key_encr);
2063: }
2064:
2065: if (response.key_auth)
2066: {
2067: PFKEY_EXT_COPY(msg, response.key_auth);
2068: }
2069: #endif
2070:
2071: #ifdef HAVE_NATT
2072: if (data->new_encap)
2073: {
2074: add_encap_ext(msg, data->new_src, data->new_dst);
2075: }
2076: #endif /*HAVE_NATT*/
2077:
2078: #ifdef SADB_X_EXT_NEW_ADDRESS_SRC
2079: if (!id->src->ip_equals(id->src, data->new_src))
2080: {
2081: add_addr_ext(msg, data->new_src, SADB_X_EXT_NEW_ADDRESS_SRC, 0, 0,
2082: FALSE);
2083: }
2084: if (!id->dst->ip_equals(id->dst, data->new_dst))
2085: {
2086: add_addr_ext(msg, data->new_dst, SADB_X_EXT_NEW_ADDRESS_DST, 0, 0,
2087: FALSE);
2088: }
2089: #endif /*SADB_X_EXT_NEW_ADDRESS_SRC*/
2090:
2091: free(out);
2092:
2093: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2094: {
2095: DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x",
2096: ntohl(id->spi));
2097: return FAILED;
2098: }
2099: else if (out->sadb_msg_errno)
2100: {
2101: DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)",
2102: ntohl(id->spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2103: free(out);
2104: return FAILED;
2105: }
2106: free(out);
2107:
2108: return SUCCESS;
2109: }
2110:
2111: METHOD(kernel_ipsec_t, query_sa, status_t,
2112: private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id,
2113: kernel_ipsec_query_sa_t *data, uint64_t *bytes, uint64_t *packets,
2114: time_t *time)
2115: {
2116: unsigned char request[PFKEY_BUFFER_SIZE];
2117: struct sadb_msg *msg, *out;
2118: struct sadb_sa *sa;
2119: pfkey_msg_t response;
2120: size_t len;
2121:
2122: memset(&request, 0, sizeof(request));
2123:
2124: DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(id->spi));
2125:
2126: msg = (struct sadb_msg*)request;
2127: msg->sadb_msg_version = PF_KEY_V2;
2128: msg->sadb_msg_type = SADB_GET;
2129: msg->sadb_msg_satype = proto2satype(id->proto);
2130: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2131:
2132: sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
2133: sa->sadb_sa_exttype = SADB_EXT_SA;
2134: sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
2135: sa->sadb_sa_spi = id->spi;
2136: PFKEY_EXT_ADD(msg, sa);
2137:
2138: /* the Linux Kernel doesn't care for the src address, but other systems do
2139: * (e.g. FreeBSD)
2140: */
2141: add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
2142: add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
2143:
2144: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2145: {
2146: DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x",
2147: ntohl(id->spi));
2148: return FAILED;
2149: }
2150: else if (out->sadb_msg_errno)
2151: {
2152: DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)",
2153: ntohl(id->spi), strerror(out->sadb_msg_errno),
2154: out->sadb_msg_errno);
2155: free(out);
2156: return FAILED;
2157: }
2158: else if (parse_pfkey_message(out, &response) != SUCCESS)
2159: {
2160: DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x",
2161: ntohl(id->spi));
2162: free(out);
2163: return FAILED;
2164: }
2165: if (bytes)
2166: {
2167: *bytes = response.lft_current->sadb_lifetime_bytes;
2168: }
2169: if (packets)
2170: {
2171: /* at least on Linux and FreeBSD this contains the number of packets */
2172: *packets = response.lft_current->sadb_lifetime_allocations;
2173: }
2174: if (time)
2175: {
2176: #ifdef __APPLE__
2177: /* OS X uses the "last" time of use in usetime */
2178: *time = response.lft_current->sadb_lifetime_usetime;
2179: #else /* !__APPLE__ */
2180: /* on Linux, sadb_lifetime_usetime is set to the "first" time of use,
2181: * which is actually correct according to PF_KEY. We have to query
2182: * policies for the last usetime. */
2183: *time = 0;
2184: #endif /* !__APPLE__ */
2185: }
2186:
2187: free(out);
2188: return SUCCESS;
2189: }
2190:
2191: METHOD(kernel_ipsec_t, del_sa, status_t,
2192: private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id,
2193: kernel_ipsec_del_sa_t *data)
2194: {
2195: unsigned char request[PFKEY_BUFFER_SIZE];
2196: struct sadb_msg *msg, *out;
2197: struct sadb_sa *sa;
2198: size_t len;
2199:
2200: /* if IPComp was used, we first delete the additional IPComp SA */
2201: if (data->cpi)
2202: {
2203: kernel_ipsec_sa_id_t ipcomp_id = {
2204: .src = id->src,
2205: .dst = id->dst,
2206: .spi = htonl(ntohs(data->cpi)),
2207: .proto = IPPROTO_COMP,
2208: .mark = id->mark,
2209: };
2210: kernel_ipsec_del_sa_t ipcomp = { 0 };
2211: del_sa(this, &ipcomp_id, &ipcomp);
2212: }
2213:
2214: memset(&request, 0, sizeof(request));
2215:
2216: DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(id->spi));
2217:
2218: msg = (struct sadb_msg*)request;
2219: msg->sadb_msg_version = PF_KEY_V2;
2220: msg->sadb_msg_type = SADB_DELETE;
2221: msg->sadb_msg_satype = proto2satype(id->proto);
2222: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2223:
2224: sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg);
2225: sa->sadb_sa_exttype = SADB_EXT_SA;
2226: sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa));
2227: sa->sadb_sa_spi = id->spi;
2228: PFKEY_EXT_ADD(msg, sa);
2229:
2230: /* the Linux Kernel doesn't care for the src address, but other systems do
2231: * (e.g. FreeBSD)
2232: */
2233: add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE);
2234: add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE);
2235:
2236: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2237: {
2238: DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x",
2239: ntohl(id->spi));
2240: return FAILED;
2241: }
2242: else if (out->sadb_msg_errno)
2243: {
2244: DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)",
2245: ntohl(id->spi), strerror(out->sadb_msg_errno),
2246: out->sadb_msg_errno);
2247: free(out);
2248: return FAILED;
2249: }
2250:
2251: DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(id->spi));
2252: free(out);
2253: return SUCCESS;
2254: }
2255:
2256: METHOD(kernel_ipsec_t, flush_sas, status_t,
2257: private_kernel_pfkey_ipsec_t *this)
2258: {
2259: unsigned char request[PFKEY_BUFFER_SIZE];
2260: struct sadb_msg *msg, *out;
2261: struct {
2262: uint8_t proto;
2263: char *name;
2264: } protos[] = {
2265: { SADB_SATYPE_AH, "AH" },
2266: { SADB_SATYPE_ESP, "ESP" },
2267: { SADB_X_SATYPE_IPCOMP, "IPComp" },
2268: };
2269: size_t len;
2270: int i;
2271:
2272: memset(&request, 0, sizeof(request));
2273:
2274: msg = (struct sadb_msg*)request;
2275: msg->sadb_msg_version = PF_KEY_V2;
2276: msg->sadb_msg_type = SADB_FLUSH;
2277: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2278:
2279: for (i = 0; i < countof(protos); i++)
2280: {
2281: DBG2(DBG_KNL, "flushing all %s SAD entries", protos[i].name);
2282:
2283: msg->sadb_msg_satype = protos[i].proto;
2284: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2285: {
2286: DBG1(DBG_KNL, "unable to flush %s SAD entries", protos[i].name);
2287: return FAILED;
2288: }
2289: else if (out->sadb_msg_errno)
2290: {
2291: DBG1(DBG_KNL, "unable to flush %s SAD entries: %s (%d)",
2292: protos[i].name, strerror(out->sadb_msg_errno),
2293: out->sadb_msg_errno);
2294: free(out);
2295: return FAILED;
2296: }
2297: free(out);
2298: }
2299: return SUCCESS;
2300: }
2301:
2302: /**
2303: * Add an explicit exclude route to a routing entry
2304: */
2305: static void add_exclude_route(private_kernel_pfkey_ipsec_t *this,
2306: route_entry_t *route, host_t *src, host_t *dst)
2307: {
2308: enumerator_t *enumerator;
2309: exclude_route_t *exclude;
2310: host_t *gtw;
2311:
2312: enumerator = this->excludes->create_enumerator(this->excludes);
2313: while (enumerator->enumerate(enumerator, &exclude))
2314: {
2315: if (dst->ip_equals(dst, exclude->dst))
2316: {
2317: route->exclude = exclude;
2318: exclude->refs++;
2319: }
2320: }
2321: enumerator->destroy(enumerator);
2322:
2323: if (!route->exclude)
2324: {
2325: DBG2(DBG_KNL, "installing new exclude route for %H src %H", dst, src);
2326: gtw = charon->kernel->get_nexthop(charon->kernel, dst, -1, NULL, NULL);
2327: if (gtw)
2328: {
2329: char *if_name = NULL;
2330:
2331: if (charon->kernel->get_interface(charon->kernel, src, &if_name) &&
2332: charon->kernel->add_route(charon->kernel,
2333: dst->get_address(dst),
2334: dst->get_family(dst) == AF_INET ? 32 : 128,
2335: gtw, src, if_name, FALSE) == SUCCESS)
2336: {
2337: INIT(exclude,
2338: .dst = dst->clone(dst),
2339: .src = src->clone(src),
2340: .gtw = gtw->clone(gtw),
2341: .refs = 1,
2342: );
2343: route->exclude = exclude;
2344: this->excludes->insert_last(this->excludes, exclude);
2345: }
2346: else
2347: {
2348: DBG1(DBG_KNL, "installing exclude route for %H failed", dst);
2349: }
2350: gtw->destroy(gtw);
2351: free(if_name);
2352: }
2353: else
2354: {
2355: DBG1(DBG_KNL, "gateway lookup for for %H failed", dst);
2356: }
2357: }
2358: }
2359:
2360: /**
2361: * Remove an exclude route attached to a routing entry
2362: */
2363: static void remove_exclude_route(private_kernel_pfkey_ipsec_t *this,
2364: route_entry_t *route)
2365: {
2366: if (route->exclude)
2367: {
2368: enumerator_t *enumerator;
2369: exclude_route_t *exclude;
2370: bool removed = FALSE;
2371: host_t *dst;
2372:
2373: enumerator = this->excludes->create_enumerator(this->excludes);
2374: while (enumerator->enumerate(enumerator, &exclude))
2375: {
2376: if (route->exclude == exclude)
2377: {
2378: if (--exclude->refs == 0)
2379: {
2380: this->excludes->remove_at(this->excludes, enumerator);
2381: removed = TRUE;
2382: break;
2383: }
2384: }
2385: }
2386: enumerator->destroy(enumerator);
2387:
2388: if (removed)
2389: {
2390: char *if_name = NULL;
2391:
2392: dst = route->exclude->dst;
2393: DBG2(DBG_KNL, "uninstalling exclude route for %H src %H",
2394: dst, route->exclude->src);
2395: if (charon->kernel->get_interface(
2396: charon->kernel,
2397: route->exclude->src, &if_name) &&
2398: charon->kernel->del_route(charon->kernel,
2399: dst->get_address(dst),
2400: dst->get_family(dst) == AF_INET ? 32 : 128,
2401: route->exclude->gtw, route->exclude->src,
2402: if_name, FALSE) != SUCCESS)
2403: {
2404: DBG1(DBG_KNL, "uninstalling exclude route for %H failed", dst);
2405: }
2406: exclude_route_destroy(route->exclude);
2407: free(if_name);
2408: }
2409: route->exclude = NULL;
2410: }
2411: }
2412:
2413: /**
2414: * Try to install a route to the given outbound policy
2415: */
2416: static bool install_route(private_kernel_pfkey_ipsec_t *this,
2417: policy_entry_t *policy, policy_sa_out_t *out)
2418: {
2419: route_entry_t *route, *old;
2420: host_t *host, *src, *dst;
2421: bool is_virtual;
2422:
2423: if (charon->kernel->get_address_by_ts(charon->kernel, out->src_ts, &host,
2424: &is_virtual) != SUCCESS)
2425: {
2426: return FALSE;
2427: }
2428:
2429: INIT(route,
2430: .prefixlen = policy->dst.mask,
2431: .src_ip = host,
2432: .dst_net = chunk_clone(policy->dst.net->get_address(policy->dst.net)),
2433: );
2434:
2435: src = out->generic.sa->src;
2436: dst = out->generic.sa->dst;
2437:
2438: if (!dst->is_anyaddr(dst))
2439: {
2440: route->gateway = charon->kernel->get_nexthop(charon->kernel, dst, -1,
2441: src, &route->if_name);
2442:
2443: /* if the IP is virtual, we install the route over the interface it has
2444: * been installed on. Otherwise we use the interface we use for IKE, as
2445: * this is required for example on Linux. */
2446: if (is_virtual || this->route_via_internal)
2447: {
2448: free(route->if_name);
2449: route->if_name = NULL;
2450: src = route->src_ip;
2451: }
2452: }
2453: else
2454: { /* for shunt policies */
2455: route->gateway = charon->kernel->get_nexthop(charon->kernel,
2456: policy->dst.net, policy->dst.mask,
2457: route->src_ip, &route->if_name);
2458:
2459: /* we don't have a source address, use the address we found */
2460: src = route->src_ip;
2461: }
2462:
2463: /* get interface for route, using source address */
2464: if (!route->if_name &&
2465: !charon->kernel->get_interface(charon->kernel, src, &route->if_name))
2466: {
2467: route_entry_destroy(route);
2468: return FALSE;
2469: }
2470:
2471: if (policy->route)
2472: {
2473: old = policy->route;
2474:
2475: if (route_entry_equals(old, route))
2476: { /* such a route already exists */
2477: route_entry_destroy(route);
2478: return TRUE;
2479: }
2480: /* uninstall previously installed route */
2481: if (charon->kernel->del_route(charon->kernel, old->dst_net,
2482: old->prefixlen, old->gateway,
2483: old->src_ip, old->if_name, FALSE) != SUCCESS)
2484: {
2485: DBG1(DBG_KNL, "error uninstalling route installed with policy "
2486: "%R === %R %N", out->src_ts, out->dst_ts,
2487: policy_dir_names, policy->direction);
2488: }
2489: route_entry_destroy(old);
2490: policy->route = NULL;
2491: }
2492:
2493: /* if remote traffic selector covers the IKE peer, add an exclude route */
2494: if (charon->kernel->get_features(charon->kernel) & KERNEL_REQUIRE_EXCLUDE_ROUTE)
2495: {
2496: if (out->dst_ts->is_host(out->dst_ts, dst))
2497: {
2498: DBG1(DBG_KNL, "can't install route for %R === %R %N, conflicts "
2499: "with IKE traffic", out->src_ts, out->dst_ts, policy_dir_names,
2500: policy->direction);
2501: route_entry_destroy(route);
2502: return FALSE;
2503: }
2504: if (out->dst_ts->includes(out->dst_ts, dst))
2505: {
2506: add_exclude_route(this, route, out->generic.sa->src, dst);
2507: }
2508: }
2509:
2510: DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s",
2511: out->dst_ts, route->gateway, route->src_ip, route->if_name);
2512:
2513: switch (charon->kernel->add_route(charon->kernel, route->dst_net,
2514: route->prefixlen, route->gateway,
2515: route->src_ip, route->if_name, FALSE))
2516: {
2517: case ALREADY_DONE:
2518: /* route exists, do not uninstall */
2519: remove_exclude_route(this, route);
2520: route_entry_destroy(route);
2521: return TRUE;
2522: case SUCCESS:
2523: /* cache the installed route */
2524: policy->route = route;
2525: return TRUE;
2526: default:
2527: DBG1(DBG_KNL, "installing route failed: %R via %H src %H dev %s",
2528: out->dst_ts, route->gateway, route->src_ip, route->if_name);
2529: remove_exclude_route(this, route);
2530: route_entry_destroy(route);
2531: return FALSE;
2532: }
2533: }
2534:
2535: /**
2536: * Check if any significant data has changed to warrant sending an update to
2537: * the kernel.
2538: */
2539: static bool policy_update_required(policy_sa_t *current, policy_sa_t *updated)
2540: {
2541: if (current->type != updated->type
2542: #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
2543: || current->priority != updated->priority
2544: #endif
2545: )
2546: {
2547: return TRUE;
2548: }
2549: if (current->type == POLICY_IPSEC)
2550: {
2551: ipsec_sa_cfg_t *cur = ¤t->sa->cfg, *upd = &updated->sa->cfg;
2552:
2553: /* we don't use ipsec_sa_cfg_equals() here as e.g. SPIs are not
2554: * relevant for this kernel interface, so we don't have to update the
2555: * policy during a rekeying */
2556: if (cur->mode != upd->mode ||
2557: cur->reqid != upd->reqid ||
2558: cur->esp.use != upd->esp.use ||
2559: cur->ah.use != upd->ah.use ||
2560: cur->ipcomp.transform != upd->ipcomp.transform)
2561: {
2562: return TRUE;
2563: }
2564: if (cur->mode == MODE_TUNNEL &&
2565: (!current->sa->src->ip_equals(current->sa->src, updated->sa->src) ||
2566: !current->sa->dst->ip_equals(current->sa->dst, updated->sa->dst)))
2567: {
2568: return TRUE;
2569: }
2570: }
2571: return FALSE;
2572: }
2573:
2574: /**
2575: * Add or update a policy in the kernel.
2576: *
2577: * Note: The mutex has to be locked when entering this function.
2578: */
2579: static status_t add_policy_internal(private_kernel_pfkey_ipsec_t *this,
2580: policy_entry_t *policy, policy_sa_t *mapping, bool update)
2581: {
2582: unsigned char request[PFKEY_BUFFER_SIZE];
2583: struct sadb_msg *msg, *out;
2584: struct sadb_x_policy *pol;
2585: struct sadb_x_ipsecrequest *req;
2586: ipsec_sa_t *ipsec = mapping->sa;
2587: pfkey_msg_t response;
2588: size_t len;
2589: ipsec_mode_t proto_mode;
2590: status_t status;
2591:
2592: memset(&request, 0, sizeof(request));
2593:
2594: msg = (struct sadb_msg*)request;
2595: msg->sadb_msg_version = PF_KEY_V2;
2596: msg->sadb_msg_type = update ? SADB_X_SPDUPDATE : SADB_X_SPDADD;
2597: msg->sadb_msg_satype = 0;
2598: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2599:
2600: pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2601: pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2602: pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2603: pol->sadb_x_policy_id = 0;
2604: pol->sadb_x_policy_dir = dir2kernel(policy->direction);
2605: pol->sadb_x_policy_type = type2kernel(mapping->type);
2606: #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY
2607: pol->sadb_x_policy_priority = mapping->priority;
2608: #endif
2609:
2610: if (mapping->type == POLICY_IPSEC && ipsec->cfg.reqid)
2611: {
2612: /* one or more sadb_x_ipsecrequest extensions are added to the
2613: * sadb_x_policy extension */
2614: proto_mode = ipsec->cfg.mode;
2615:
2616: req = (struct sadb_x_ipsecrequest*)(pol + 1);
2617:
2618: if (ipsec->cfg.ipcomp.transform != IPCOMP_NONE)
2619: {
2620: req->sadb_x_ipsecrequest_proto = IPPROTO_COMP;
2621:
2622: /* !!! the length here MUST be in octets instead of 64 bit words */
2623: req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2624: req->sadb_x_ipsecrequest_mode = mode2kernel(ipsec->cfg.mode);
2625: req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2626: req->sadb_x_ipsecrequest_level = (policy->direction == POLICY_OUT) ?
2627: IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_USE;
2628: if (ipsec->cfg.mode == MODE_TUNNEL)
2629: {
2630: len = hostcpy(req + 1, ipsec->src, FALSE);
2631: req->sadb_x_ipsecrequest_len += len;
2632: len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2633: req->sadb_x_ipsecrequest_len += len;
2634: /* use transport mode for other SAs */
2635: proto_mode = MODE_TRANSPORT;
2636: }
2637:
2638: pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2639: req = (struct sadb_x_ipsecrequest*)((char*)(req) +
2640: req->sadb_x_ipsecrequest_len);
2641: }
2642:
2643: req->sadb_x_ipsecrequest_proto = ipsec->cfg.esp.use ? IPPROTO_ESP
2644: : IPPROTO_AH;
2645: /* !!! the length here MUST be in octets instead of 64 bit words */
2646: req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
2647: req->sadb_x_ipsecrequest_mode = mode2kernel(proto_mode);
2648: req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid;
2649: req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2650: if (proto_mode == MODE_TUNNEL)
2651: {
2652: len = hostcpy(req + 1, ipsec->src, FALSE);
2653: req->sadb_x_ipsecrequest_len += len;
2654: len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE);
2655: req->sadb_x_ipsecrequest_len += len;
2656: }
2657:
2658: pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len);
2659: }
2660: PFKEY_EXT_ADD(msg, pol);
2661:
2662: add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2663: policy->src.mask, TRUE);
2664: add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2665: policy->dst.mask, TRUE);
2666:
2667: #ifdef __FreeBSD__
2668: { /* on FreeBSD a lifetime has to be defined to be able to later query
2669: * the current use time. */
2670: struct sadb_lifetime *lft;
2671: lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg);
2672: lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2673: lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime));
2674: lft->sadb_lifetime_addtime = LONG_MAX;
2675: PFKEY_EXT_ADD(msg, lft);
2676: }
2677: #endif
2678:
2679: this->mutex->unlock(this->mutex);
2680:
2681: status = pfkey_send(this, msg, &out, &len);
2682: if (status == SUCCESS && !update && out->sadb_msg_errno == EEXIST)
2683: {
2684: DBG1(DBG_KNL, "policy already exists, try to update it");
2685: free(out);
2686: msg->sadb_msg_type = SADB_X_SPDUPDATE;
2687: status = pfkey_send(this, msg, &out, &len);
2688: }
2689: if (status != SUCCESS)
2690: {
2691: return FAILED;
2692: }
2693: else if (out->sadb_msg_errno)
2694: {
2695: DBG1(DBG_KNL, "unable to %s policy: %s (%d)",
2696: update ? "update" : "add", strerror(out->sadb_msg_errno),
2697: out->sadb_msg_errno);
2698: free(out);
2699: return FAILED;
2700: }
2701: else if (parse_pfkey_message(out, &response) != SUCCESS)
2702: {
2703: DBG1(DBG_KNL, "unable to %s policy: parsing response from kernel "
2704: "failed", update ? "update" : "add");
2705: free(out);
2706: return FAILED;
2707: }
2708:
2709: /* we try to find the policy again and update the kernel index */
2710: this->mutex->lock(this->mutex);
2711: if (!this->policies->find_first(this->policies, NULL, (void**)&policy))
2712: {
2713: DBG2(DBG_KNL, "unable to update index, the policy is already gone, "
2714: "ignoring");
2715: this->mutex->unlock(this->mutex);
2716: free(out);
2717: return SUCCESS;
2718: }
2719: policy->index = response.x_policy->sadb_x_policy_id;
2720: free(out);
2721:
2722: /* install a route, if:
2723: * - this is an outbound policy (to just get one for each child)
2724: * - routing is not disabled via strongswan.conf
2725: * - the selector is not for a specific protocol/port
2726: * - we are in tunnel mode or install a bypass policy
2727: */
2728: if (policy->direction == POLICY_OUT && this->install_routes &&
2729: policy->src.proto == IPSEC_PROTO_ANY &&
2730: !policy->src.net->get_port(policy->src.net) &&
2731: !policy->dst.net->get_port(policy->dst.net))
2732: {
2733: if (mapping->type == POLICY_PASS ||
2734: (mapping->type == POLICY_IPSEC && ipsec->cfg.mode != MODE_TRANSPORT))
2735: {
2736: install_route(this, policy, (policy_sa_out_t*)mapping);
2737: }
2738: }
2739: this->mutex->unlock(this->mutex);
2740: return SUCCESS;
2741: }
2742:
2743: METHOD(kernel_ipsec_t, add_policy, status_t,
2744: private_kernel_pfkey_ipsec_t *this, kernel_ipsec_policy_id_t *id,
2745: kernel_ipsec_manage_policy_t *data)
2746: {
2747: policy_entry_t *policy, *found = NULL;
2748: policy_sa_t *assigned_sa, *current_sa = NULL;
2749: enumerator_t *enumerator;
2750: bool update = TRUE;
2751:
2752: if (dir2kernel(id->dir) == IPSEC_DIR_INVALID)
2753: { /* FWD policies are not supported on all platforms */
2754: return SUCCESS;
2755: }
2756:
2757: /* create a policy */
2758: policy = create_policy_entry(id->src_ts, id->dst_ts, id->dir);
2759:
2760: /* find a matching policy */
2761: this->mutex->lock(this->mutex);
2762: if (this->policies->find_first(this->policies, policy_entry_equals,
2763: (void**)&found, policy))
2764: { /* use existing policy */
2765: DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
2766: "refcount", id->src_ts, id->dst_ts, policy_dir_names, id->dir);
2767: policy_entry_destroy(policy, this);
2768: policy = found;
2769: }
2770: else
2771: { /* use the new one, if we have no such policy */
2772: this->policies->insert_first(this->policies, policy);
2773: policy->used_by = linked_list_create();
2774: }
2775:
2776: /* cache the assigned IPsec SA */
2777: assigned_sa = policy_sa_create(this, id->dir, data->type, data->src,
2778: data->dst, id->src_ts, id->dst_ts, data->sa);
2779: assigned_sa->auto_priority = get_priority(policy, data->prio);
2780: assigned_sa->priority = data->manual_prio ? data->manual_prio :
2781: assigned_sa->auto_priority;
2782:
2783:
2784: /* insert the SA according to its priority */
2785: enumerator = policy->used_by->create_enumerator(policy->used_by);
2786: while (enumerator->enumerate(enumerator, (void**)¤t_sa))
2787: {
2788: if (current_sa->priority > assigned_sa->priority)
2789: {
2790: break;
2791: }
2792: if (current_sa->priority == assigned_sa->priority)
2793: {
2794: /* in case of equal manual prios order SAs by automatic priority */
2795: if (current_sa->auto_priority > assigned_sa->auto_priority)
2796: {
2797: break;
2798: }
2799: /* prefer SAs with a reqid over those without */
2800: if (current_sa->auto_priority == assigned_sa->auto_priority &&
2801: (!current_sa->sa->cfg.reqid || assigned_sa->sa->cfg.reqid))
2802: {
2803: break;
2804: }
2805: }
2806: update = FALSE;
2807: }
2808: policy->used_by->insert_before(policy->used_by, enumerator, assigned_sa);
2809: enumerator->destroy(enumerator);
2810:
2811: if (update && current_sa)
2812: { /* check if there are actually any relevant changes, if not, we don't
2813: * send an update to the kernel as e.g. FreeBSD doesn't do that
2814: * atomically, causing unnecessary traffic loss during rekeyings */
2815: update = policy_update_required(current_sa, assigned_sa);
2816: }
2817:
2818: if (!update)
2819: { /* we don't update the policy if the priority is lower than that of the
2820: * currently installed one */
2821: this->mutex->unlock(this->mutex);
2822: return SUCCESS;
2823: }
2824:
2825: DBG2(DBG_KNL, "%s policy %R === %R %N",
2826: found ? "updating" : "adding", id->src_ts, id->dst_ts,
2827: policy_dir_names, id->dir);
2828:
2829: if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS)
2830: {
2831: DBG1(DBG_KNL, "unable to %s policy %R === %R %N",
2832: found ? "update" : "add", id->src_ts, id->dst_ts,
2833: policy_dir_names, id->dir);
2834: return FAILED;
2835: }
2836: return SUCCESS;
2837: }
2838:
2839: METHOD(kernel_ipsec_t, query_policy, status_t,
2840: private_kernel_pfkey_ipsec_t *this, kernel_ipsec_policy_id_t *id,
2841: kernel_ipsec_query_policy_t *data, time_t *use_time)
2842: {
2843: unsigned char request[PFKEY_BUFFER_SIZE];
2844: struct sadb_msg *msg, *out;
2845: struct sadb_x_policy *pol;
2846: policy_entry_t *policy, *found = NULL;
2847: pfkey_msg_t response;
2848: size_t len;
2849:
2850: if (dir2kernel(id->dir) == IPSEC_DIR_INVALID)
2851: { /* FWD policies are not supported on all platforms */
2852: return NOT_FOUND;
2853: }
2854:
2855: DBG2(DBG_KNL, "querying policy %R === %R %N", id->src_ts, id->dst_ts,
2856: policy_dir_names, id->dir);
2857:
2858: /* create a policy */
2859: policy = create_policy_entry(id->src_ts, id->dst_ts, id->dir);
2860:
2861: /* find a matching policy */
2862: this->mutex->lock(this->mutex);
2863: if (!this->policies->find_first(this->policies, policy_entry_equals,
2864: (void**)&found, policy))
2865: {
2866: DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found",
2867: id->src_ts, id->dst_ts, policy_dir_names, id->dir);
2868: policy_entry_destroy(policy, this);
2869: this->mutex->unlock(this->mutex);
2870: return NOT_FOUND;
2871: }
2872: policy_entry_destroy(policy, this);
2873: policy = found;
2874:
2875: memset(&request, 0, sizeof(request));
2876:
2877: msg = (struct sadb_msg*)request;
2878: msg->sadb_msg_version = PF_KEY_V2;
2879: msg->sadb_msg_type = SADB_X_SPDGET;
2880: msg->sadb_msg_satype = 0;
2881: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
2882:
2883: pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
2884: pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2885: pol->sadb_x_policy_id = policy->index;
2886: pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
2887: pol->sadb_x_policy_dir = dir2kernel(id->dir);
2888: pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2889: PFKEY_EXT_ADD(msg, pol);
2890:
2891: add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
2892: policy->src.mask, TRUE);
2893: add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
2894: policy->dst.mask, TRUE);
2895:
2896: this->mutex->unlock(this->mutex);
2897:
2898: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
2899: {
2900: DBG1(DBG_KNL, "unable to query policy %R === %R %N", id->src_ts,
2901: id->dst_ts, policy_dir_names, id->dir);
2902: return FAILED;
2903: }
2904: else if (out->sadb_msg_errno)
2905: {
2906: DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)",
2907: id->src_ts, id->dst_ts, policy_dir_names, id->dir,
2908: strerror(out->sadb_msg_errno), out->sadb_msg_errno);
2909: free(out);
2910: return FAILED;
2911: }
2912: else if (parse_pfkey_message(out, &response) != SUCCESS)
2913: {
2914: DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response "
2915: "from kernel failed", id->src_ts, id->dst_ts, policy_dir_names,
2916: id->dir);
2917: free(out);
2918: return FAILED;
2919: }
2920: else if (response.lft_current == NULL)
2921: {
2922: DBG2(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no "
2923: "use time", id->src_ts, id->dst_ts, policy_dir_names,
2924: id->dir);
2925: free(out);
2926: return FAILED;
2927: }
2928:
2929: /* we need the monotonic time, but the kernel returns system time. */
2930: if (response.lft_current->sadb_lifetime_usetime)
2931: {
2932: *use_time = time_monotonic(NULL) -
2933: (time(NULL) - response.lft_current->sadb_lifetime_usetime);
2934: }
2935: else
2936: {
2937: *use_time = 0;
2938: }
2939: free(out);
2940: return SUCCESS;
2941: }
2942:
2943: METHOD(kernel_ipsec_t, del_policy, status_t,
2944: private_kernel_pfkey_ipsec_t *this, kernel_ipsec_policy_id_t *id,
2945: kernel_ipsec_manage_policy_t *data)
2946: {
2947: unsigned char request[PFKEY_BUFFER_SIZE];
2948: struct sadb_msg *msg, *out;
2949: struct sadb_x_policy *pol;
2950: policy_entry_t *policy, *found = NULL;
2951: policy_sa_t *mapping, *to_remove = NULL;
2952: enumerator_t *enumerator;
2953: bool first = TRUE, is_installed = TRUE;
2954: uint32_t priority, auto_priority;
2955: size_t len;
2956: ipsec_sa_t assigned_sa = {
2957: .src = data->src,
2958: .dst = data->dst,
2959: .cfg = *data->sa,
2960: };
2961:
2962: if (dir2kernel(id->dir) == IPSEC_DIR_INVALID)
2963: { /* FWD policies are not supported on all platforms */
2964: return SUCCESS;
2965: }
2966:
2967: DBG2(DBG_KNL, "deleting policy %R === %R %N", id->src_ts, id->dst_ts,
2968: policy_dir_names, id->dir);
2969:
2970: /* create a policy */
2971: policy = create_policy_entry(id->src_ts, id->dst_ts, id->dir);
2972:
2973: /* find a matching policy */
2974: this->mutex->lock(this->mutex);
2975: if (!this->policies->find_first(this->policies, policy_entry_equals,
2976: (void**)&found, policy))
2977: {
2978: DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found",
2979: id->src_ts, id->dst_ts, policy_dir_names, id->dir);
2980: policy_entry_destroy(policy, this);
2981: this->mutex->unlock(this->mutex);
2982: return NOT_FOUND;
2983: }
2984: policy_entry_destroy(policy, this);
2985: policy = found;
2986:
2987: /* remove mapping to SA by reqid and priority, if multiple match, which
2988: * could happen when rekeying due to an address change, remove the oldest */
2989: auto_priority = get_priority(policy, data->prio);
2990: priority = data->manual_prio ? data->manual_prio : auto_priority;
2991: enumerator = policy->used_by->create_enumerator(policy->used_by);
2992: while (enumerator->enumerate(enumerator, (void**)&mapping))
2993: {
2994: if (priority == mapping->priority &&
2995: auto_priority == mapping->auto_priority &&
2996: data->type == mapping->type &&
2997: ipsec_sa_equals(mapping->sa, &assigned_sa))
2998: {
2999: to_remove = mapping;
3000: is_installed = first;
3001: }
3002: else if (priority < mapping->priority)
3003: {
3004: break;
3005: }
3006: first = FALSE;
3007: }
3008: enumerator->destroy(enumerator);
3009: if (!to_remove)
3010: { /* sanity check */
3011: this->mutex->unlock(this->mutex);
3012: return SUCCESS;
3013: }
3014: policy->used_by->remove(policy->used_by, to_remove, NULL);
3015:
3016: if (policy->used_by->get_count(policy->used_by) > 0)
3017: { /* policy is used by more SAs, keep in kernel */
3018: DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
3019:
3020: if (is_installed)
3021: { /* check if there are actually any relevant changes, if not, we do
3022: * not send an update to the kernel as e.g. FreeBSD doesn't do that
3023: * atomically, causing unnecessary traffic loss during rekeyings */
3024: policy->used_by->get_first(policy->used_by, (void**)&mapping);
3025: is_installed = policy_update_required(mapping, to_remove);
3026: }
3027: policy_sa_destroy(to_remove, id->dir, this);
3028:
3029: if (!is_installed)
3030: { /* no need to update as the policy */
3031: this->mutex->unlock(this->mutex);
3032: return SUCCESS;
3033: }
3034:
3035: DBG2(DBG_KNL, "updating policy %R === %R %N", id->src_ts, id->dst_ts,
3036: policy_dir_names, id->dir);
3037: if (add_policy_internal(this, policy, mapping, TRUE) != SUCCESS)
3038: {
3039: DBG1(DBG_KNL, "unable to update policy %R === %R %N",
3040: id->src_ts, id->dst_ts, policy_dir_names, id->dir);
3041: return FAILED;
3042: }
3043: return SUCCESS;
3044: }
3045:
3046: memset(&request, 0, sizeof(request));
3047:
3048: msg = (struct sadb_msg*)request;
3049: msg->sadb_msg_version = PF_KEY_V2;
3050: msg->sadb_msg_type = SADB_X_SPDDELETE;
3051: msg->sadb_msg_satype = 0;
3052: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
3053:
3054: pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg);
3055: pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3056: pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy));
3057: pol->sadb_x_policy_dir = dir2kernel(id->dir);
3058: pol->sadb_x_policy_type = type2kernel(to_remove->type);
3059: PFKEY_EXT_ADD(msg, pol);
3060:
3061: add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto,
3062: policy->src.mask, TRUE);
3063: add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto,
3064: policy->dst.mask, TRUE);
3065:
3066: if (policy->route)
3067: {
3068: route_entry_t *route = policy->route;
3069: if (charon->kernel->del_route(charon->kernel, route->dst_net,
3070: route->prefixlen, route->gateway,
3071: route->src_ip, route->if_name, FALSE) != SUCCESS)
3072: {
3073: DBG1(DBG_KNL, "error uninstalling route installed with "
3074: "policy %R === %R %N", id->src_ts, id->dst_ts,
3075: policy_dir_names, id->dir);
3076: }
3077: remove_exclude_route(this, route);
3078: }
3079:
3080: this->policies->remove(this->policies, found, NULL);
3081: policy_sa_destroy(to_remove, id->dir, this);
3082: policy_entry_destroy(policy, this);
3083: this->mutex->unlock(this->mutex);
3084:
3085: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
3086: {
3087: DBG1(DBG_KNL, "unable to delete policy %R === %R %N", id->src_ts,
3088: id->dst_ts, policy_dir_names, id->dir);
3089: return FAILED;
3090: }
3091: else if (out->sadb_msg_errno)
3092: {
3093: DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)",
3094: id->src_ts, id->dst_ts, policy_dir_names, id->dir,
3095: strerror(out->sadb_msg_errno), out->sadb_msg_errno);
3096: free(out);
3097: return FAILED;
3098: }
3099: free(out);
3100: return SUCCESS;
3101: }
3102:
3103: METHOD(kernel_ipsec_t, flush_policies, status_t,
3104: private_kernel_pfkey_ipsec_t *this)
3105: {
3106: unsigned char request[PFKEY_BUFFER_SIZE];
3107: struct sadb_msg *msg, *out;
3108: size_t len;
3109:
3110: memset(&request, 0, sizeof(request));
3111:
3112: DBG2(DBG_KNL, "flushing all policies from SPD");
3113:
3114: msg = (struct sadb_msg*)request;
3115: msg->sadb_msg_version = PF_KEY_V2;
3116: msg->sadb_msg_type = SADB_X_SPDFLUSH;
3117: msg->sadb_msg_satype = SADB_SATYPE_UNSPEC;
3118: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
3119:
3120: if (pfkey_send(this, msg, &out, &len) != SUCCESS)
3121: {
3122: DBG1(DBG_KNL, "unable to flush SPD entries");
3123: return FAILED;
3124: }
3125: else if (out->sadb_msg_errno)
3126: {
3127: DBG1(DBG_KNL, "unable to flush SPD entries: %s (%d)",
3128: strerror(out->sadb_msg_errno), out->sadb_msg_errno);
3129: free(out);
3130: return FAILED;
3131: }
3132: free(out);
3133: return SUCCESS;
3134: }
3135:
3136: /**
3137: * Register a socket for ACQUIRE/EXPIRE messages
3138: */
3139: static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this,
3140: uint8_t satype)
3141: {
3142: unsigned char request[PFKEY_BUFFER_SIZE];
3143: struct sadb_msg *msg, *out;
3144: size_t len;
3145:
3146: memset(&request, 0, sizeof(request));
3147:
3148: msg = (struct sadb_msg*)request;
3149: msg->sadb_msg_version = PF_KEY_V2;
3150: msg->sadb_msg_type = SADB_REGISTER;
3151: msg->sadb_msg_satype = satype;
3152: msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg));
3153:
3154: if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS)
3155: {
3156: DBG1(DBG_KNL, "unable to register PF_KEY socket");
3157: return FAILED;
3158: }
3159: else if (out->sadb_msg_errno)
3160: {
3161: DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)",
3162: strerror(out->sadb_msg_errno), out->sadb_msg_errno);
3163: free(out);
3164: return FAILED;
3165: }
3166: free(out);
3167: return SUCCESS;
3168: }
3169:
3170: METHOD(kernel_ipsec_t, bypass_socket, bool,
3171: private_kernel_pfkey_ipsec_t *this, int fd, int family)
3172: {
3173: struct sadb_x_policy policy;
3174: u_int sol, ipsec_policy;
3175:
3176: switch (family)
3177: {
3178: case AF_INET:
3179: {
3180: sol = SOL_IP;
3181: ipsec_policy = IP_IPSEC_POLICY;
3182: break;
3183: }
3184: case AF_INET6:
3185: {
3186: sol = SOL_IPV6;
3187: ipsec_policy = IPV6_IPSEC_POLICY;
3188: break;
3189: }
3190: default:
3191: return FALSE;
3192: }
3193:
3194: memset(&policy, 0, sizeof(policy));
3195: policy.sadb_x_policy_len = sizeof(policy) / sizeof(uint64_t);
3196: policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3197: policy.sadb_x_policy_type = IPSEC_POLICY_BYPASS;
3198:
3199: policy.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND;
3200: if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
3201: {
3202: DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
3203: strerror(errno));
3204: return FALSE;
3205: }
3206: policy.sadb_x_policy_dir = IPSEC_DIR_INBOUND;
3207: if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0)
3208: {
3209: DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s",
3210: strerror(errno));
3211: return FALSE;
3212: }
3213: return TRUE;
3214: }
3215:
3216: METHOD(kernel_ipsec_t, enable_udp_decap, bool,
3217: private_kernel_pfkey_ipsec_t *this, int fd, int family, uint16_t port)
3218: {
3219: #ifndef __APPLE__
3220: int type = UDP_ENCAP_ESPINUDP;
3221:
3222: if (setsockopt(fd, SOL_UDP, UDP_ENCAP, &type, sizeof(type)) < 0)
3223: {
3224: DBG1(DBG_KNL, "unable to set UDP_ENCAP: %s", strerror(errno));
3225: return FALSE;
3226: }
3227: #else /* __APPLE__ */
3228: int intport = port;
3229:
3230: if (sysctlbyname("net.inet.ipsec.esp_port", NULL, NULL, &intport,
3231: sizeof(intport)) != 0)
3232: {
3233: DBG1(DBG_KNL, "could not set net.inet.ipsec.esp_port to %d: %s",
3234: port, strerror(errno));
3235: return FALSE;
3236: }
3237: #endif /* __APPLE__ */
3238:
3239: return TRUE;
3240: }
3241:
3242: METHOD(kernel_ipsec_t, destroy, void,
3243: private_kernel_pfkey_ipsec_t *this)
3244: {
3245: if (this->socket > 0)
3246: {
3247: close(this->socket);
3248: }
3249: if (this->socket_events > 0)
3250: {
3251: lib->watcher->remove(lib->watcher, this->socket_events);
3252: close(this->socket_events);
3253: }
3254: this->policies->invoke_function(this->policies, policy_entry_destroy_cb,
3255: this);
3256: this->policies->destroy(this->policies);
3257: this->excludes->destroy(this->excludes);
3258: this->sas->destroy(this->sas);
3259: this->mutex->destroy(this->mutex);
3260: this->mutex_pfkey->destroy(this->mutex_pfkey);
3261: free(this);
3262: }
3263:
3264: /*
3265: * Described in header.
3266: */
3267: kernel_pfkey_ipsec_t *kernel_pfkey_ipsec_create()
3268: {
3269: private_kernel_pfkey_ipsec_t *this;
3270: bool register_for_events = TRUE;
3271: int rcv_buffer;
3272:
3273: INIT(this,
3274: .public = {
3275: .interface = {
3276: .get_spi = _get_spi,
3277: .get_cpi = _get_cpi,
3278: .add_sa = _add_sa,
3279: .update_sa = _update_sa,
3280: .query_sa = _query_sa,
3281: .del_sa = _del_sa,
3282: .flush_sas = _flush_sas,
3283: .add_policy = _add_policy,
3284: .query_policy = _query_policy,
3285: .del_policy = _del_policy,
3286: .flush_policies = _flush_policies,
3287: .bypass_socket = _bypass_socket,
3288: .enable_udp_decap = _enable_udp_decap,
3289: .destroy = _destroy,
3290: },
3291: },
3292: .policies = linked_list_create(),
3293: .excludes = linked_list_create(),
3294: .sas = hashtable_create((hashtable_hash_t)ipsec_sa_hash,
3295: (hashtable_equals_t)ipsec_sa_equals, 32),
3296: .mutex = mutex_create(MUTEX_TYPE_DEFAULT),
3297: .mutex_pfkey = mutex_create(MUTEX_TYPE_DEFAULT),
3298: .install_routes = lib->settings->get_bool(lib->settings,
3299: "%s.install_routes", TRUE,
3300: lib->ns),
3301: .route_via_internal = lib->settings->get_bool(lib->settings,
3302: "%s.plugins.kernel-pfkey.route_via_internal",
3303: FALSE, lib->ns),
3304: );
3305:
3306: if (streq(lib->ns, "starter"))
3307: { /* starter has no threads, so we do not register for kernel events */
3308: register_for_events = FALSE;
3309: }
3310:
3311: /* create a PF_KEY socket to communicate with the kernel */
3312: this->socket = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
3313: if (this->socket <= 0)
3314: {
3315: DBG1(DBG_KNL, "unable to create PF_KEY socket");
3316: destroy(this);
3317: return NULL;
3318: }
3319:
3320: if (register_for_events)
3321: {
3322: /* create a PF_KEY socket for ACQUIRE & EXPIRE */
3323: this->socket_events = socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
3324: if (this->socket_events <= 0)
3325: {
3326: DBG1(DBG_KNL, "unable to create PF_KEY event socket");
3327: destroy(this);
3328: return NULL;
3329: }
3330:
3331: rcv_buffer = lib->settings->get_int(lib->settings,
3332: "%s.plugins.kernel-pfkey.events_buffer_size", 0, lib->ns);
3333: if (rcv_buffer > 0)
3334: {
3335: if (setsockopt(this->socket_events, SOL_SOCKET, SO_RCVBUF,
3336: &rcv_buffer, sizeof(rcv_buffer)) == -1)
3337: {
3338: DBG1(DBG_KNL, "unable to set receive buffer size on PF_KEY "
3339: "event socket: %s", strerror(errno));
3340: }
3341: }
3342:
3343: /* register the event socket */
3344: if (register_pfkey_socket(this, SADB_SATYPE_ESP) != SUCCESS ||
3345: register_pfkey_socket(this, SADB_SATYPE_AH) != SUCCESS)
3346: {
3347: DBG1(DBG_KNL, "unable to register PF_KEY event socket");
3348: destroy(this);
3349: return NULL;
3350: }
3351:
3352: lib->watcher->add(lib->watcher, this->socket_events, WATCHER_READ,
3353: (watcher_cb_t)receive_events, this);
3354: }
3355:
3356: return &this->public;
3357: }
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