1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
|
/* $OpenBSD: ip_ipsp.h,v 1.37 1999/06/30 17:23:59 deraadt Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr),
* Niels Provos (provos@physnet.uni-hamburg.de) and
* Niklas Hallqvist (niklas@appli.se).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
*
* Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
* Angelos D. Keromytis and Niels Provos.
* Copyright (c) 1999 Niklas Hallqvist.
*
* Permission to use, copy, and modify this software without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#ifndef _NETINET_IPSP_H_
#define _NETINET_IPSP_H_
/*
* IPSP global definitions.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <sys/md5k.h>
#include <netinet/ip_sha1.h>
#include <netinet/ip_rmd160.h>
#include <netinet/ip_blf.h>
#include <netinet/ip_cast.h>
#include <netinet/ip_skipjack.h>
union sockaddr_union
{
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
};
/* HMAC key sizes */
#define MD5HMAC96_KEYSIZE 16
#define SHA1HMAC96_KEYSIZE 20
#define RIPEMD160HMAC96_KEYSIZE 20
/* IV lengths */
#define ESP_DES_IVS 8
#define ESP_3DES_IVS 8
#define ESP_BLF_IVS 8
#define ESP_CAST_IVS 8
#define ESP_SKIPJACK_IVS 8
#define ESP_MAX_IVS 8 /* Keep updated */
/* Block sizes -- it is assumed that they're powers of 2 */
#define ESP_DES_BLKS 8
#define ESP_3DES_BLKS 8
#define ESP_BLF_BLKS 8
#define ESP_CAST_BLKS 8
#define ESP_SKIPJACK_BLKS 8
#define ESP_MAX_BLKS 8 /* Keep updated */
#define HMAC_BLOCK_LEN 64
#define AH_HMAC_HASHLEN 12 /* 96 bits of authenticator */
#define AH_HMAC_RPLENGTH 4 /* 32 bits of replay counter */
#define AH_HMAC_INITIAL_RPL 1 /* Replay counter initial value */
/* HMAC definitions */
#define HMAC_IPAD_VAL 0x36
#define HMAC_OPAD_VAL 0x5C
#define HMAC_BLOCK_LEN 64
/* Authenticator lengths */
#define AH_MD5_ALEN 16
#define AH_SHA1_ALEN 20
#define AH_RMD160_ALEN 20
#define AH_ALEN_MAX 20 /* Keep updated */
struct sockaddr_encap
{
u_int8_t sen_len; /* length */
u_int8_t sen_family; /* PF_KEY */
u_int16_t sen_type; /* see SENT_* */
union
{
u_int8_t Data[16]; /* other stuff mapped here */
struct /* SENT_IP4 */
{
struct in_addr Src;
struct in_addr Dst;
u_int16_t Sport;
u_int16_t Dport;
u_int8_t Proto;
u_int8_t Filler[3];
} Sip4;
struct /* SENT_IPSP */
{
struct in_addr Dst;
u_int32_t Spi;
u_int8_t Sproto;
u_int8_t Filler[7];
} Sipsp;
} Sen;
};
#define sen_data Sen.Data
#define sen_ip_src Sen.Sip4.Src
#define sen_ip_dst Sen.Sip4.Dst
#define sen_proto Sen.Sip4.Proto
#define sen_sport Sen.Sip4.Sport
#define sen_dport Sen.Sip4.Dport
#define sen_ipsp_dst Sen.Sipsp.Dst
#define sen_ipsp_spi Sen.Sipsp.Spi
#define sen_ipsp_sproto Sen.Sipsp.Sproto
/*
* The "type" is really part of the address as far as the routing
* system is concerned. By using only one bit in the type field
* for each type, we sort-of make sure that different types of
* encapsulation addresses won't be matched against the wrong type.
*
*/
#define SENT_IP4 0x0001 /* data is two struct in_addr */
#define SENT_IPSP 0x0002 /* data as in IP4 plus SPI */
/*
* SENT_HDRLEN is the length of the "header"
* SENT_*_LEN are the lengths of various forms of sen_data
* SENT_*_OFF are the offsets in the sen_data array of various fields
*/
#define SENT_HDRLEN (2 * sizeof(u_int8_t) + sizeof(u_int16_t))
#define SENT_IP4_SRCOFF (0)
#define SENT_IP4_DSTOFF (sizeof (struct in_addr))
#define SENT_IP4_LEN 20
#define SENT_IPSP_LEN 20
#define NOTIFY_SOFT_EXPIRE 0 /* Soft expiration of SA */
#define NOTIFY_HARD_EXPIRE 1 /* Hard expiration of SA */
#define NOTIFY_REQUEST_SA 2 /* Establish an SA */
#define NOTIFY_SATYPE_CONF 1 /* SA should do encryption */
#define NOTIFY_SATYPE_AUTH 2 /* SA should do authentication */
#define NOTIFY_SATYPE_TUNNEL 4 /* SA should use tunneling */
/*
* For encapsulation routes are possible not only for the destination
* address but also for the protocol, source and destination ports
* if available
*/
struct route_enc {
struct rtentry *re_rt;
struct sockaddr_encap re_dst;
};
struct flow
{
struct flow *flow_next; /* Next in flow chain */
struct flow *flow_prev; /* Previous in flow chain */
struct tdb *flow_sa; /* Pointer to the SA */
union sockaddr_union flow_src; /* Source address */
union sockaddr_union flow_srcmask; /* Source netmask */
union sockaddr_union flow_dst; /* Destination address */
union sockaddr_union flow_dstmask; /* Destination netmask */
u_int8_t flow_proto; /* Transport protocol, if applicable */
u_int8_t foo[3]; /* Alignment */
};
struct tdb /* tunnel descriptor block */
{
struct tdb *tdb_hnext; /* Next in hash chain */
struct tdb *tdb_onext; /* Next in output */
struct tdb *tdb_inext; /* Previous in output */
struct xformsw *tdb_xform; /* Transformation to use */
struct enc_xform *tdb_encalgxform; /* Encryption algorithm xform */
struct auth_hash *tdb_authalgxform; /* Authentication algorithm xform */
#define TDBF_UNIQUE 0x00001 /* This should not be used by others */
#define TDBF_TIMER 0x00002 /* Absolute expiration timer in use */
#define TDBF_BYTES 0x00004 /* Check the byte counters */
#define TDBF_ALLOCATIONS 0x00008 /* Check the flows counters */
#define TDBF_INVALID 0x00010 /* This SPI is not valid yet/anymore */
#define TDBF_FIRSTUSE 0x00020 /* Expire after first use */
#define TDBF_HALFIV 0x00040 /* Use half-length IV (ESP old only) */
#define TDBF_SOFT_TIMER 0x00080 /* Soft expiration */
#define TDBF_SOFT_BYTES 0x00100 /* Soft expiration */
#define TDBF_SOFT_ALLOCATIONS 0x00200 /* Soft expiration */
#define TDBF_SOFT_FIRSTUSE 0x00400 /* Soft expiration */
#define TDBF_PFS 0x00800 /* Ask for PFS from Key Mgmt. */
#define TDBF_TUNNELING 0x01000 /* Force IP-IP encapsulation */
u_int32_t tdb_flags; /* Flags related to this TDB */
TAILQ_ENTRY(tdb) tdb_expnext; /* Expiration cluster list link */
TAILQ_ENTRY(tdb) tdb_explink; /* Expiration ordered list link */
u_int32_t tdb_exp_allocations; /* Expire after so many flows */
u_int32_t tdb_soft_allocations; /* Expiration warning */
u_int32_t tdb_cur_allocations; /* Total number of allocations */
u_int64_t tdb_exp_bytes; /* Expire after so many bytes passed */
u_int64_t tdb_soft_bytes; /* Expiration warning */
u_int64_t tdb_cur_bytes; /* Current count of bytes */
u_int64_t tdb_exp_timeout; /* When does the SPI expire */
u_int64_t tdb_soft_timeout; /* Send a soft-expire warning */
u_int64_t tdb_established; /* When was the SPI established */
u_int64_t tdb_timeout; /* Next absolute expiration time. */
u_int64_t tdb_first_use; /* When was it first used */
u_int64_t tdb_soft_first_use; /* Soft warning */
u_int64_t tdb_exp_first_use; /* Expire if tdb_first_use +
* tdb_exp_first_use <= curtime */
u_int32_t tdb_spi; /* SPI */
u_int16_t tdb_amxkeylen; /* AH-old only */
u_int16_t tdb_ivlen; /* IV length */
u_int8_t tdb_sproto; /* IPsec protocol */
u_int8_t tdb_wnd; /* Replay window */
u_int16_t tdb_FILLER; /* Padding */
union sockaddr_union tdb_dst; /* Destination address for this SA */
union sockaddr_union tdb_src; /* Source address for this SA */
union sockaddr_union tdb_proxy;
u_int8_t *tdb_key; /* Key material (schedules) */
u_int8_t *tdb_ictx; /* Authentication contexts */
u_int8_t *tdb_octx;
u_int8_t *tdb_srcid; /* Source ID for this SA */
u_int8_t *tdb_dstid; /* Destination ID for this SA */
u_int8_t *tdb_amxkey; /* AH-old only */
union
{
u_int8_t Iv[ESP_3DES_IVS]; /* That's enough space */
u_int32_t Ivl; /* Make sure this is 4 bytes */
u_int64_t Ivq; /* Make sure this is 8 bytes! */
}IV;
#define tdb_iv IV.Iv
#define tdb_ivl IV.Ivl
#define tdb_ivq IV.Ivq
u_int32_t tdb_rpl; /* Replay counter */
u_int32_t tdb_bitmap; /* Used for replay sliding window */
u_int32_t tdb_initial; /* Initial replay value */
u_int32_t tdb_epoch; /* Used by the kernfs interface */
u_int16_t tdb_srcid_len;
u_int16_t tdb_dstid_len;
u_int16_t tdb_srcid_type;
u_int16_t tdb_dstid_type;
struct flow *tdb_flow; /* Which flows use this SA */
struct tdb *tdb_bind_out; /* Outgoing SA to use */
TAILQ_HEAD(tdb_bind_head, tdb) tdb_bind_in;
TAILQ_ENTRY(tdb) tdb_bind_in_next; /* Refering Incoming SAs */
TAILQ_HEAD(tdb_inp_head, inpcb) tdb_inp;
};
union authctx_old {
MD5_CTX md5ctx;
SHA1_CTX sha1ctx;
};
union authctx {
MD5_CTX md5ctx;
SHA1_CTX sha1ctx;
RMD160_CTX rmd160ctx;
};
struct tdb_ident {
u_int32_t spi;
union sockaddr_union dst;
u_int8_t proto;
};
struct auth_hash {
int type;
char *name;
u_int16_t keysize;
u_int16_t hashsize;
u_int16_t ctxsize;
void (*Init)(void *);
void (*Update)(void *, u_int8_t *, u_int16_t);
void (*Final)(u_int8_t *, void *);
};
struct enc_xform {
int type;
char *name;
u_int16_t blocksize, ivsize;
u_int16_t minkey, maxkey;
u_int32_t ivmask; /* Or all possible modes, zero iv = 1 */
void (*encrypt)(struct tdb *, u_int8_t *);
void (*decrypt)(struct tdb *, u_int8_t *);
void (*setkey)(u_int8_t **, u_int8_t *, int len);
void (*zerokey)(u_int8_t **);
};
struct ipsecinit
{
u_int8_t *ii_enckey;
u_int8_t *ii_authkey;
u_int16_t ii_enckeylen;
u_int16_t ii_authkeylen;
u_int8_t ii_encalg;
u_int8_t ii_authalg;
};
struct xformsw
{
u_short xf_type; /* Unique ID of xform */
u_short xf_flags; /* flags (see below) */
char *xf_name; /* human-readable name */
int (*xf_attach)(void); /* called at config time */
int (*xf_init)(struct tdb *, struct xformsw *, struct ipsecinit *);
int (*xf_zeroize)(struct tdb *); /* termination */
struct mbuf *(*xf_input)(struct mbuf *, struct tdb *); /* input */
int (*xf_output)(struct mbuf *, struct sockaddr_encap *,
struct tdb *, struct mbuf **); /* output */
};
/* xform IDs */
#define XF_IP4 1 /* IP inside IP */
#define XF_OLD_AH 2 /* RFCs 1828 & 1852 */
#define XF_OLD_ESP 3 /* RFCs 1829 & 1851 */
#define XF_NEW_AH 4 /* AH HMAC 96bits */
#define XF_NEW_ESP 5 /* ESP + auth 96bits + replay counter */
/* xform attributes */
#define XFT_AUTH 0x0001
#define XFT_CONF 0x0100
#define IPSEC_ZEROES_SIZE 64
#define IPSEC_KERNFS_BUFSIZE 4096
#if BYTE_ORDER == LITTLE_ENDIAN
static __inline u_int64_t
htonq(u_int64_t q)
{
register u_int32_t u, l;
u = q >> 32;
l = (u_int32_t) q;
return htonl(u) | ((u_int64_t)htonl(l) << 32);
}
#define ntohq(_x) htonq(_x)
#elif BYTE_ORDER == BIG_ENDIAN
#define htonq(_x) (_x)
#define ntohq(_x) htonq(_x)
#else
#error "Please fix <machine/endian.h>"
#endif
#ifdef _KERNEL
/*
* Protects all tdb lists.
* Must at least be splsoftclock.
*/
#define spltdb splsoftclock
extern int encdebug;
extern int ipsec_in_use;
extern u_int8_t hmac_ipad_buffer[64];
extern u_int8_t hmac_opad_buffer[64];
extern TAILQ_HEAD(expclusterlist_head, tdb) expclusterlist;
extern TAILQ_HEAD(explist_head, tdb) explist;
extern struct xformsw xformsw[], *xformswNXFORMSW;
/* Check if a given tdb has encryption, authentication and/or tunneling */
#define TDB_ATTRIB(x) (((x)->tdb_encalgxform ? NOTIFY_SATYPE_CONF : 0)| \
((x)->tdb_authalgxform ? NOTIFY_SATYPE_AUTH : 0))
/* Traverse spi chain and get attributes */
#define SPI_CHAIN_ATTRIB(have, TDB_DIR, TDBP) do {\
int s = spltdb(); \
struct tdb *tmptdb = (TDBP); \
\
(have) = 0; \
while (tmptdb && tmptdb->tdb_xform) { \
if (tmptdb == NULL || tmptdb->tdb_flags & TDBF_INVALID) \
break; \
(have) |= TDB_ATTRIB(tmptdb); \
tmptdb = tmptdb->TDB_DIR; \
} \
splx(s); \
} while (0)
/* Misc. */
extern char *inet_ntoa4(struct in_addr);
extern char *ipsp_address(union sockaddr_union);
/* TDB management routines */
extern void tdb_add_inp(struct tdb *tdb, struct inpcb *inp);
extern u_int32_t reserve_spi(u_int32_t, u_int32_t, union sockaddr_union *,
union sockaddr_union *, u_int8_t, int *);
extern struct tdb *gettdb(u_int32_t, union sockaddr_union *, u_int8_t);
extern void puttdb(struct tdb *);
extern void tdb_delete(struct tdb *, int, int);
extern int tdb_init (struct tdb *, u_int16_t, struct ipsecinit *);
extern void tdb_expiration(struct tdb *, int);
/* Flag values for the last argument of tdb_expiration(). */
#define TDBEXP_EARLY 1 /* The tdb is likely to end up early. */
#define TDBEXP_TIMEOUT 2 /* Maintain expiration timeout. */
extern void handle_expirations(void *);
/* Flow management routines */
extern struct flow *get_flow(void);
extern void put_flow(struct flow *, struct tdb *);
extern void delete_flow(struct flow *, struct tdb *);
extern struct flow *find_flow(union sockaddr_union *, union sockaddr_union *,
union sockaddr_union *, union sockaddr_union *,
u_int8_t, struct tdb *);
extern struct flow *find_global_flow(union sockaddr_union *,
union sockaddr_union *,
union sockaddr_union *,
union sockaddr_union *, u_int8_t);
/* XF_IP4 */
extern int ipe4_attach(void);
extern int ipe4_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int ipe4_zeroize(struct tdb *);
extern int ipe4_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern void ipe4_input __P((struct mbuf *, ...));
extern void ip4_input __P((struct mbuf *, ...));
/* XF_OLD_AH */
extern int ah_old_attach(void);
extern int ah_old_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int ah_old_zeroize(struct tdb *);
extern int ah_old_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *ah_old_input(struct mbuf *, struct tdb *);
/* XF_NEW_AH */
extern int ah_new_attach(void);
extern int ah_new_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int ah_new_zeroize(struct tdb *);
extern int ah_new_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *ah_new_input(struct mbuf *, struct tdb *);
/* XF_OLD_ESP */
extern int esp_old_attach(void);
extern int esp_old_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int esp_old_zeroize(struct tdb *);
extern int esp_old_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *esp_old_input(struct mbuf *, struct tdb *);
/* XF_NEW_ESP */
extern int esp_new_attach(void);
extern int esp_new_init(struct tdb *, struct xformsw *, struct ipsecinit *);
extern int esp_new_zeroize(struct tdb *);
extern int esp_new_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *esp_new_input(struct mbuf *, struct tdb *);
/* Padding */
extern caddr_t m_pad(struct mbuf *, int, int);
/* Replay window */
extern int checkreplaywindow32(u_int32_t, u_int32_t, u_int32_t *, u_int32_t,
u_int32_t *);
extern unsigned char ipseczeroes[];
#endif /* _KERNEL */
#endif /* _NETINET_IPSP_H_ */
|
