ipsec.c revision 1.16
1 /* $NetBSD: ipsec.c,v 1.16 2005/05/08 18:44:40 christos Exp $ */ 2 /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */ 3 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.16 2005/05/08 18:44:40 christos Exp $"); 36 37 /* 38 * IPsec controller part. 39 */ 40 41 #include "opt_inet.h" 42 #ifdef __FreeBSD__ 43 #include "opt_inet6.h" 44 #endif 45 #include "opt_ipsec.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/domain.h> 52 #include <sys/protosw.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/errno.h> 56 #include <sys/time.h> 57 #include <sys/kernel.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/proc.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/ip.h> 68 #include <netinet/ip_var.h> 69 #include <netinet/in_var.h> 70 #include <netinet/udp.h> 71 #include <netinet/udp_var.h> 72 #include <netinet/tcp.h> 73 #include <netinet/udp.h> 74 75 #include <netinet/ip6.h> 76 #ifdef INET6 77 #include <netinet6/ip6_var.h> 78 #endif 79 #include <netinet/in_pcb.h> 80 #ifdef INET6 81 #include <netinet6/in6_pcb.h> 82 #include <netinet/icmp6.h> 83 #endif 84 85 #include <netipsec/ipsec.h> 86 #include <netipsec/ipsec_var.h> 87 #ifdef INET6 88 #include <netipsec/ipsec6.h> 89 #endif 90 #include <netipsec/ah_var.h> 91 #include <netipsec/esp_var.h> 92 #include <netipsec/ipcomp.h> /*XXX*/ 93 #include <netipsec/ipcomp_var.h> 94 95 #include <netipsec/key.h> 96 #include <netipsec/keydb.h> 97 #include <netipsec/key_debug.h> 98 99 #include <netipsec/xform.h> 100 101 #include <netipsec/ipsec_osdep.h> 102 103 #include <net/net_osdep.h> 104 105 #ifdef IPSEC_DEBUG 106 int ipsec_debug = 1; 107 #else 108 int ipsec_debug = 0; 109 #endif 110 111 /* NB: name changed so netstat doesn't use it */ 112 struct newipsecstat newipsecstat; 113 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 114 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 115 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 116 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 117 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 118 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 119 struct secpolicy ip4_def_policy; 120 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 121 int ip4_esp_randpad = -1; 122 123 #ifdef __NetBSD__ 124 u_int ipsec_spdgen = 1; /* SPD generation # */ 125 126 static struct secpolicy *ipsec_checkpcbcache __P((struct mbuf *, 127 struct inpcbpolicy *, int)); 128 static int ipsec_fillpcbcache __P((struct inpcbpolicy *, struct mbuf *, 129 struct secpolicy *, int)); 130 static int ipsec_invalpcbcache __P((struct inpcbpolicy *, int)); 131 #endif /* __NetBSD__ */ 132 133 /* 134 * Crypto support requirements: 135 * 136 * 1 require hardware support 137 * -1 require software support 138 * 0 take anything 139 */ 140 int crypto_support = 0; 141 142 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, 143 PCB_T *, int *); 144 145 #ifdef __FreeBSD__ 146 SYSCTL_DECL(_net_inet_ipsec); 147 148 /* net.inet.ipsec */ 149 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 150 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 151 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 152 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 153 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 154 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 155 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 156 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 157 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 158 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 159 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 160 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 161 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 162 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 163 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 164 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 165 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 166 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 167 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 168 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 169 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 170 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 171 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 172 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 173 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 174 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 175 #endif /* __FreeBSD__ */ 176 177 #ifdef INET6 178 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 179 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 180 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 181 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 182 struct secpolicy ip6_def_policy; 183 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 184 int ip6_esp_randpad = -1; 185 186 187 #ifdef __FreeBSD__ 188 SYSCTL_DECL(_net_inet6_ipsec6); 189 190 /* net.inet6.ipsec6 */ 191 #ifdef COMPAT_KAME 192 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 193 0,0, compat_ipsecstats_sysctl, "S", ""); 194 #endif /* COMPAT_KAME */ 195 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 196 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 197 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 198 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 199 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 200 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 201 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 202 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 203 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 204 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 205 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 206 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 207 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 208 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 209 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 210 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 211 #endif /* INET6 */ 212 #endif /* __FreeBSD__ */ 213 214 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 215 #ifdef INET6 216 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 217 #endif 218 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 219 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 220 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 221 #ifdef INET6 222 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 223 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 224 #endif 225 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 226 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 227 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 228 int optname, caddr_t request, size_t len, int priv)); 229 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 230 static void vshiftl __P((unsigned char *, int, int)); 231 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 232 233 #ifdef __NetBSD__ 234 /* 235 * Try to validate and use cached policy on a PCB. 236 */ 237 static struct secpolicy * 238 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) 239 { 240 struct secpolicyindex spidx; 241 242 switch (dir) { 243 case IPSEC_DIR_INBOUND: 244 case IPSEC_DIR_OUTBOUND: 245 case IPSEC_DIR_ANY: 246 break; 247 default: 248 return NULL; 249 } 250 #ifdef DIAGNOSTIC 251 if (pcbsp == NULL) { 252 printf("ipsec_checkpcbcache: NULL pcbsp\n"); 253 /* XXX panic? */ 254 return NULL; 255 } 256 #endif 257 258 #ifdef DIAGNOSTIC 259 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 260 panic("dir too big in ipsec_checkpcbcache"); 261 #endif 262 /* SPD table change invalidate all the caches. */ 263 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { 264 ipsec_invalpcbcache(pcbsp, dir); 265 return NULL; 266 } 267 if (!pcbsp->sp_cache[dir].cachesp) 268 return NULL; 269 if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) { 270 ipsec_invalpcbcache(pcbsp, dir); 271 return NULL; 272 } 273 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { 274 if (!pcbsp->sp_cache[dir].cachesp) 275 return NULL; 276 if (ipsec_setspidx(m, &spidx, 1) != 0) 277 return NULL; 278 if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, 279 sizeof(spidx))) { 280 if (!key_cmpspidx_withmask(&pcbsp->sp_cache[dir].cachesp->spidx, 281 &spidx)) 282 return NULL; 283 pcbsp->sp_cache[dir].cacheidx = spidx; 284 } 285 } else { 286 /* 287 * The pcb is connected, and the L4 code is sure that: 288 * - outgoing side uses inp_[lf]addr 289 * - incoming side looks up policy after inpcb lookup 290 * and address pair is know to be stable. We do not need 291 * to generate spidx again, nor check the address match again. 292 * 293 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 294 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 295 */ 296 } 297 298 pcbsp->sp_cache[dir].cachesp->lastused = mono_time.tv_sec; 299 pcbsp->sp_cache[dir].cachesp->refcnt++; 300 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 301 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n", 302 pcbsp->sp_cache[dir].cachesp->refcnt, 303 pcbsp->sp_cache[dir].cachesp)); 304 return pcbsp->sp_cache[dir].cachesp; 305 } 306 307 static int 308 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 309 struct secpolicy *sp, int dir) 310 { 311 312 switch (dir) { 313 case IPSEC_DIR_INBOUND: 314 case IPSEC_DIR_OUTBOUND: 315 break; 316 default: 317 return EINVAL; 318 } 319 #ifdef DIAGNOSTIC 320 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 321 panic("dir too big in ipsec_fillpcbcache"); 322 #endif 323 324 if (pcbsp->sp_cache[dir].cachesp) 325 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp); 326 pcbsp->sp_cache[dir].cachesp = NULL; 327 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE; 328 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 329 return EINVAL; 330 } 331 pcbsp->sp_cache[dir].cachesp = sp; 332 if (pcbsp->sp_cache[dir].cachesp) { 333 pcbsp->sp_cache[dir].cachesp->refcnt++; 334 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 335 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n", 336 pcbsp->sp_cache[dir].cachesp->refcnt, 337 pcbsp->sp_cache[dir].cachesp)); 338 339 /* 340 * If the PCB is connected, we can remember a hint to 341 * possibly short-circuit IPsec processing in other places. 342 */ 343 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 344 switch (pcbsp->sp_cache[dir].cachesp->policy) { 345 case IPSEC_POLICY_NONE: 346 case IPSEC_POLICY_BYPASS: 347 pcbsp->sp_cache[dir].cachehint = 348 IPSEC_PCBHINT_NO; 349 break; 350 default: 351 pcbsp->sp_cache[dir].cachehint = 352 IPSEC_PCBHINT_YES; 353 } 354 } 355 } 356 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 357 358 return 0; 359 } 360 361 static int 362 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 363 { 364 int i; 365 366 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 367 if (dir != IPSEC_DIR_ANY && i != dir) 368 continue; 369 if (pcbsp->sp_cache[i].cachesp) 370 KEY_FREESP(&pcbsp->sp_cache[i].cachesp); 371 pcbsp->sp_cache[i].cachesp = NULL; 372 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE; 373 pcbsp->sp_cache[i].cachegen = 0; 374 bzero(&pcbsp->sp_cache[i].cacheidx, 375 sizeof(pcbsp->sp_cache[i].cacheidx)); 376 } 377 return 0; 378 } 379 380 void 381 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 382 { 383 384 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 385 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 386 } 387 388 void 389 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 390 { 391 392 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 393 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 394 } 395 396 void 397 ipsec_invalpcbcacheall(void) 398 { 399 400 if (ipsec_spdgen == UINT_MAX) 401 ipsec_spdgen = 1; 402 else 403 ipsec_spdgen++; 404 } 405 #endif /* __NetBSD__ */ 406 407 /* 408 * Return a held reference to the default SP. 409 */ 410 static struct secpolicy * 411 key_allocsp_default(const char* where, int tag) 412 { 413 struct secpolicy *sp; 414 415 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 416 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 417 418 sp = &ip4_def_policy; 419 if (sp->policy != IPSEC_POLICY_DISCARD && 420 sp->policy != IPSEC_POLICY_NONE) { 421 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 422 sp->policy, IPSEC_POLICY_NONE)); 423 sp->policy = IPSEC_POLICY_NONE; 424 } 425 sp->refcnt++; 426 427 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 428 printf("DP key_allocsp_default returns SP:%p (%u)\n", 429 sp, sp->refcnt)); 430 return sp; 431 } 432 #define KEY_ALLOCSP_DEFAULT() \ 433 key_allocsp_default(__FILE__, __LINE__) 434 435 /* 436 * For OUTBOUND packet having a socket. Searching SPD for packet, 437 * and return a pointer to SP. 438 * OUT: NULL: no apropreate SP found, the following value is set to error. 439 * 0 : bypass 440 * EACCES : discard packet. 441 * ENOENT : ipsec_acquire() in progress, maybe. 442 * others : error occurred. 443 * others: a pointer to SP 444 * 445 * NOTE: IPv6 mapped adddress concern is implemented here. 446 */ 447 struct secpolicy * 448 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 449 { 450 struct secpolicy *sp; 451 452 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 453 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 454 ("ipsec_getpolicy: invalid direction %u", dir)); 455 456 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 457 if (sp == NULL) /*XXX????*/ 458 sp = KEY_ALLOCSP_DEFAULT(); 459 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 460 return sp; 461 } 462 463 /* 464 * For OUTBOUND packet having a socket. Searching SPD for packet, 465 * and return a pointer to SP. 466 * OUT: NULL: no apropreate SP found, the following value is set to error. 467 * 0 : bypass 468 * EACCES : discard packet. 469 * ENOENT : ipsec_acquire() in progress, maybe. 470 * others : error occurred. 471 * others: a pointer to SP 472 * 473 * NOTE: IPv6 mapped adddress concern is implemented here. 474 */ 475 static struct secpolicy * 476 ipsec_getpolicybysock(m, dir, inp, error) 477 struct mbuf *m; 478 u_int dir; 479 PCB_T *inp; 480 int *error; 481 { 482 struct inpcbpolicy *pcbsp = NULL; 483 struct secpolicy *currsp = NULL; /* policy on socket */ 484 struct secpolicy *sp; 485 int af; 486 487 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 488 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 489 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 490 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 491 ("ipsec_getpolicybysock: invalid direction %u", dir)); 492 493 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 494 ("ipsec_getppolicybysock: null socket\n")); 495 496 /* XXX FIXME inpcb/in6pcb vs socket*/ 497 af = PCB_FAMILY(inp); 498 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 499 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 500 501 #ifdef __NetBSD__ 502 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 503 /* If we have a cached entry, and if it is still valid, use it. */ 504 ipsecstat.ips_spdcache_lookup++; 505 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 506 if (currsp) { 507 *error = 0; 508 return currsp; 509 } 510 ipsecstat.ips_spdcache_miss++; 511 #endif /* __NetBSD__ */ 512 513 switch (af) { 514 case AF_INET: { 515 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 516 /* set spidx in pcb */ 517 *error = ipsec4_setspidx_inpcb(m, in4p); 518 pcbsp = in4p->inp_sp; 519 break; 520 } 521 522 #if defined(INET6) 523 case AF_INET6: { 524 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 525 /* set spidx in pcb */ 526 *error = ipsec6_setspidx_in6pcb(m, in6p); 527 pcbsp = in6p->in6p_sp; 528 break; 529 } 530 #endif 531 default: 532 *error = EPFNOSUPPORT; 533 break; 534 } 535 if (*error) 536 return NULL; 537 538 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 539 switch (dir) { 540 case IPSEC_DIR_INBOUND: 541 currsp = pcbsp->sp_in; 542 break; 543 case IPSEC_DIR_OUTBOUND: 544 currsp = pcbsp->sp_out; 545 break; 546 } 547 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 548 549 if (pcbsp->priv) { /* when privilieged socket */ 550 switch (currsp->policy) { 551 case IPSEC_POLICY_BYPASS: 552 case IPSEC_POLICY_IPSEC: 553 currsp->refcnt++; 554 sp = currsp; 555 break; 556 557 case IPSEC_POLICY_ENTRUST: 558 /* look for a policy in SPD */ 559 sp = KEY_ALLOCSP(&currsp->spidx, dir); 560 if (sp == NULL) /* no SP found */ 561 sp = KEY_ALLOCSP_DEFAULT(); 562 break; 563 564 default: 565 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 566 "Invalid policy for PCB %d\n", currsp->policy)); 567 *error = EINVAL; 568 return NULL; 569 } 570 } else { /* unpriv, SPD has policy */ 571 sp = KEY_ALLOCSP(&currsp->spidx, dir); 572 if (sp == NULL) { /* no SP found */ 573 switch (currsp->policy) { 574 case IPSEC_POLICY_BYPASS: 575 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 576 "Illegal policy for non-priviliged defined %d\n", 577 currsp->policy)); 578 *error = EINVAL; 579 return NULL; 580 581 case IPSEC_POLICY_ENTRUST: 582 sp = KEY_ALLOCSP_DEFAULT(); 583 break; 584 585 case IPSEC_POLICY_IPSEC: 586 currsp->refcnt++; 587 sp = currsp; 588 break; 589 590 default: 591 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 592 "Invalid policy for PCB %d\n", currsp->policy)); 593 *error = EINVAL; 594 return NULL; 595 } 596 } 597 } 598 IPSEC_ASSERT(sp != NULL, 599 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 600 pcbsp->priv, currsp->policy)); 601 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 602 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 603 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 604 sp, sp->refcnt)); 605 #ifdef __NetBSD__ 606 ipsec_fillpcbcache(pcbsp, m, sp, dir); 607 #endif /* __NetBSD__ */ 608 return sp; 609 } 610 611 /* 612 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 613 * and return a pointer to SP. 614 * OUT: positive: a pointer to the entry for security policy leaf matched. 615 * NULL: no apropreate SP found, the following value is set to error. 616 * 0 : bypass 617 * EACCES : discard packet. 618 * ENOENT : ipsec_acquire() in progress, maybe. 619 * others : error occurred. 620 */ 621 struct secpolicy * 622 ipsec_getpolicybyaddr(m, dir, flag, error) 623 struct mbuf *m; 624 u_int dir; 625 int flag; 626 int *error; 627 { 628 struct secpolicyindex spidx; 629 struct secpolicy *sp; 630 631 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 632 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 633 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 634 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 635 636 sp = NULL; 637 if (key_havesp(dir)) { 638 /* Make an index to look for a policy. */ 639 *error = ipsec_setspidx(m, &spidx, 640 (flag & IP_FORWARDING) ? 0 : 1); 641 if (*error != 0) { 642 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 643 " dir %u flag %u\n", dir, flag)); 644 bzero(&spidx, sizeof (spidx)); 645 return NULL; 646 } 647 spidx.dir = dir; 648 649 sp = KEY_ALLOCSP(&spidx, dir); 650 } 651 if (sp == NULL) /* no SP found, use system default */ 652 sp = KEY_ALLOCSP_DEFAULT(); 653 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 654 return sp; 655 } 656 657 struct secpolicy * 658 ipsec4_checkpolicy(m, dir, flag, error, inp) 659 struct mbuf *m; 660 u_int dir, flag; 661 int *error; 662 struct inpcb *inp; 663 { 664 struct secpolicy *sp; 665 666 *error = 0; 667 668 669 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 670 if (inp == NULL || inp->inp_socket == NULL) { 671 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 672 } else 673 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 674 if (sp == NULL) { 675 IPSEC_ASSERT(*error != 0, 676 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 677 newipsecstat.ips_out_inval++; 678 return NULL; 679 } 680 IPSEC_ASSERT(*error == 0, 681 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 682 switch (sp->policy) { 683 case IPSEC_POLICY_ENTRUST: 684 default: 685 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 686 /* fall thru... */ 687 case IPSEC_POLICY_DISCARD: 688 newipsecstat.ips_out_polvio++; 689 *error = -EINVAL; /* packet is discarded by caller */ 690 break; 691 case IPSEC_POLICY_BYPASS: 692 case IPSEC_POLICY_NONE: 693 KEY_FREESP(&sp); 694 sp = NULL; /* NB: force NULL result */ 695 break; 696 case IPSEC_POLICY_IPSEC: 697 if (sp->req == NULL) /* acquire an SA */ 698 *error = key_spdacquire(sp); 699 break; 700 } 701 if (*error != 0) { 702 KEY_FREESP(&sp); 703 sp = NULL; 704 } 705 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error)); 706 return sp; 707 } 708 709 static int 710 ipsec4_setspidx_inpcb(m, pcb) 711 struct mbuf *m; 712 struct inpcb *pcb; 713 { 714 int error; 715 716 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 717 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 718 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 719 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 720 721 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 722 if (error == 0) { 723 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 724 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 725 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 726 } else { 727 bzero(&pcb->inp_sp->sp_in->spidx, 728 sizeof (pcb->inp_sp->sp_in->spidx)); 729 bzero(&pcb->inp_sp->sp_out->spidx, 730 sizeof (pcb->inp_sp->sp_in->spidx)); 731 } 732 return error; 733 } 734 735 #ifdef INET6 736 static int 737 ipsec6_setspidx_in6pcb(m, pcb) 738 struct mbuf *m; 739 struct in6pcb *pcb; 740 { 741 struct secpolicyindex *spidx; 742 int error; 743 744 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 745 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 746 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 747 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 748 749 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 750 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 751 752 spidx = &pcb->in6p_sp->sp_in->spidx; 753 error = ipsec_setspidx(m, spidx, 1); 754 if (error) 755 goto bad; 756 spidx->dir = IPSEC_DIR_INBOUND; 757 758 spidx = &pcb->in6p_sp->sp_out->spidx; 759 error = ipsec_setspidx(m, spidx, 1); 760 if (error) 761 goto bad; 762 spidx->dir = IPSEC_DIR_OUTBOUND; 763 764 return 0; 765 766 bad: 767 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 768 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 769 return error; 770 } 771 #endif 772 773 /* 774 * configure security policy index (src/dst/proto/sport/dport) 775 * by looking at the content of mbuf. 776 * the caller is responsible for error recovery (like clearing up spidx). 777 */ 778 static int 779 ipsec_setspidx(m, spidx, needport) 780 struct mbuf *m; 781 struct secpolicyindex *spidx; 782 int needport; 783 { 784 struct ip *ip = NULL; 785 struct ip ipbuf; 786 u_int v; 787 struct mbuf *n; 788 int len; 789 int error; 790 791 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 792 793 /* 794 * validate m->m_pkthdr.len. we see incorrect length if we 795 * mistakenly call this function with inconsistent mbuf chain 796 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 797 */ 798 len = 0; 799 for (n = m; n; n = n->m_next) 800 len += n->m_len; 801 if (m->m_pkthdr.len != len) { 802 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 803 printf("ipsec_setspidx: " 804 "total of m_len(%d) != pkthdr.len(%d), " 805 "ignored.\n", 806 len, m->m_pkthdr.len)); 807 return EINVAL; 808 } 809 810 if (m->m_pkthdr.len < sizeof(struct ip)) { 811 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 812 printf("ipsec_setspidx: " 813 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 814 m->m_pkthdr.len)); 815 return EINVAL; 816 } 817 818 if (m->m_len >= sizeof(*ip)) 819 ip = mtod(m, struct ip *); 820 else { 821 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 822 ip = &ipbuf; 823 } 824 #ifdef _IP_VHL 825 v = _IP_VHL_V(ip->ip_vhl); 826 #else 827 v = ip->ip_v; 828 #endif 829 switch (v) { 830 case 4: 831 error = ipsec4_setspidx_ipaddr(m, spidx); 832 if (error) 833 return error; 834 ipsec4_get_ulp(m, spidx, needport); 835 return 0; 836 #ifdef INET6 837 case 6: 838 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 839 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 840 printf("ipsec_setspidx: " 841 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 842 "ignored.\n", m->m_pkthdr.len)); 843 return EINVAL; 844 } 845 error = ipsec6_setspidx_ipaddr(m, spidx); 846 if (error) 847 return error; 848 ipsec6_get_ulp(m, spidx, needport); 849 return 0; 850 #endif 851 default: 852 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 853 printf("ipsec_setspidx: " 854 "unknown IP version %u, ignored.\n", v)); 855 return EINVAL; 856 } 857 } 858 859 static void 860 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 861 { 862 u_int8_t nxt; 863 int off; 864 865 /* sanity check */ 866 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 867 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 868 ("ipsec4_get_ulp: packet too short")); 869 870 /* NB: ip_input() flips it into host endian XXX need more checking */ 871 if (m->m_len >= sizeof(struct ip)) { 872 struct ip *ip = mtod(m, struct ip *); 873 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 874 goto done; 875 #ifdef _IP_VHL 876 off = _IP_VHL_HL(ip->ip_vhl) << 2; 877 #else 878 off = ip->ip_hl << 2; 879 #endif 880 nxt = ip->ip_p; 881 } else { 882 struct ip ih; 883 884 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 885 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 886 goto done; 887 #ifdef _IP_VHL 888 off = _IP_VHL_HL(ih.ip_vhl) << 2; 889 #else 890 off = ih.ip_hl << 2; 891 #endif 892 nxt = ih.ip_p; 893 } 894 895 while (off < m->m_pkthdr.len) { 896 struct ip6_ext ip6e; 897 struct tcphdr th; 898 struct udphdr uh; 899 900 switch (nxt) { 901 case IPPROTO_TCP: 902 spidx->ul_proto = nxt; 903 if (!needport) 904 goto done_proto; 905 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 906 goto done; 907 m_copydata(m, off, sizeof (th), (caddr_t) &th); 908 spidx->src.sin.sin_port = th.th_sport; 909 spidx->dst.sin.sin_port = th.th_dport; 910 return; 911 case IPPROTO_UDP: 912 spidx->ul_proto = nxt; 913 if (!needport) 914 goto done_proto; 915 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 916 goto done; 917 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 918 spidx->src.sin.sin_port = uh.uh_sport; 919 spidx->dst.sin.sin_port = uh.uh_dport; 920 return; 921 case IPPROTO_AH: 922 if (m->m_pkthdr.len > off + sizeof(ip6e)) 923 goto done; 924 /* XXX sigh, this works but is totally bogus */ 925 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 926 off += (ip6e.ip6e_len + 2) << 2; 927 nxt = ip6e.ip6e_nxt; 928 break; 929 case IPPROTO_ICMP: 930 default: 931 /* XXX intermediate headers??? */ 932 spidx->ul_proto = nxt; 933 goto done_proto; 934 } 935 } 936 done: 937 spidx->ul_proto = IPSEC_ULPROTO_ANY; 938 done_proto: 939 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 940 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 941 } 942 943 /* assumes that m is sane */ 944 static int 945 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 946 { 947 static const struct sockaddr_in template = { 948 sizeof (struct sockaddr_in), 949 AF_INET, 950 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 951 }; 952 953 spidx->src.sin = template; 954 spidx->dst.sin = template; 955 956 if (m->m_len < sizeof (struct ip)) { 957 m_copydata(m, offsetof(struct ip, ip_src), 958 sizeof (struct in_addr), 959 (caddr_t) &spidx->src.sin.sin_addr); 960 m_copydata(m, offsetof(struct ip, ip_dst), 961 sizeof (struct in_addr), 962 (caddr_t) &spidx->dst.sin.sin_addr); 963 } else { 964 struct ip *ip = mtod(m, struct ip *); 965 spidx->src.sin.sin_addr = ip->ip_src; 966 spidx->dst.sin.sin_addr = ip->ip_dst; 967 } 968 969 spidx->prefs = sizeof(struct in_addr) << 3; 970 spidx->prefd = sizeof(struct in_addr) << 3; 971 972 return 0; 973 } 974 975 #ifdef INET6 976 static void 977 ipsec6_get_ulp(m, spidx, needport) 978 struct mbuf *m; 979 struct secpolicyindex *spidx; 980 int needport; 981 { 982 int off, nxt; 983 struct tcphdr th; 984 struct udphdr uh; 985 986 /* sanity check */ 987 if (m == NULL) 988 panic("ipsec6_get_ulp: NULL pointer was passed"); 989 990 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 991 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 992 993 /* set default */ 994 spidx->ul_proto = IPSEC_ULPROTO_ANY; 995 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 996 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 997 998 nxt = -1; 999 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1000 if (off < 0 || m->m_pkthdr.len < off) 1001 return; 1002 1003 switch (nxt) { 1004 case IPPROTO_TCP: 1005 spidx->ul_proto = nxt; 1006 if (!needport) 1007 break; 1008 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1009 break; 1010 m_copydata(m, off, sizeof(th), (caddr_t)&th); 1011 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1012 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1013 break; 1014 case IPPROTO_UDP: 1015 spidx->ul_proto = nxt; 1016 if (!needport) 1017 break; 1018 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1019 break; 1020 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 1021 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1022 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1023 break; 1024 case IPPROTO_ICMPV6: 1025 default: 1026 /* XXX intermediate headers??? */ 1027 spidx->ul_proto = nxt; 1028 break; 1029 } 1030 } 1031 1032 /* assumes that m is sane */ 1033 static int 1034 ipsec6_setspidx_ipaddr(m, spidx) 1035 struct mbuf *m; 1036 struct secpolicyindex *spidx; 1037 { 1038 struct ip6_hdr *ip6 = NULL; 1039 struct ip6_hdr ip6buf; 1040 struct sockaddr_in6 *sin6; 1041 1042 if (m->m_len >= sizeof(*ip6)) 1043 ip6 = mtod(m, struct ip6_hdr *); 1044 else { 1045 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 1046 ip6 = &ip6buf; 1047 } 1048 1049 sin6 = (struct sockaddr_in6 *)&spidx->src; 1050 bzero(sin6, sizeof(*sin6)); 1051 sin6->sin6_family = AF_INET6; 1052 sin6->sin6_len = sizeof(struct sockaddr_in6); 1053 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 1054 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1055 sin6->sin6_addr.s6_addr16[1] = 0; 1056 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1057 } 1058 spidx->prefs = sizeof(struct in6_addr) << 3; 1059 1060 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1061 bzero(sin6, sizeof(*sin6)); 1062 sin6->sin6_family = AF_INET6; 1063 sin6->sin6_len = sizeof(struct sockaddr_in6); 1064 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 1065 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1066 sin6->sin6_addr.s6_addr16[1] = 0; 1067 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1068 } 1069 spidx->prefd = sizeof(struct in6_addr) << 3; 1070 1071 return 0; 1072 } 1073 #endif 1074 1075 static void 1076 ipsec_delpcbpolicy(p) 1077 struct inpcbpolicy *p; 1078 { 1079 free(p, M_SECA); 1080 } 1081 1082 /* initialize policy in PCB */ 1083 int 1084 ipsec_init_policy(so, pcb_sp) 1085 struct socket *so; 1086 struct inpcbpolicy **pcb_sp; 1087 { 1088 struct inpcbpolicy *new; 1089 1090 /* sanity check. */ 1091 if (so == NULL || pcb_sp == NULL) 1092 panic("ipsec_init_policy: NULL pointer was passed"); 1093 1094 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 1095 M_SECA, M_NOWAIT|M_ZERO); 1096 if (new == NULL) { 1097 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1098 return ENOBUFS; 1099 } 1100 1101 if (IPSEC_PRIVILEGED_SO(so)) 1102 new->priv = 1; 1103 else 1104 new->priv = 0; 1105 1106 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1107 ipsec_delpcbpolicy(new); 1108 return ENOBUFS; 1109 } 1110 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1111 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1112 1113 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1114 KEY_FREESP(&new->sp_in); 1115 ipsec_delpcbpolicy(new); 1116 return ENOBUFS; 1117 } 1118 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1119 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1120 1121 *pcb_sp = new; 1122 1123 return 0; 1124 } 1125 1126 /* copy old ipsec policy into new */ 1127 int 1128 ipsec_copy_policy(old, new) 1129 struct inpcbpolicy *old, *new; 1130 { 1131 struct secpolicy *sp; 1132 1133 sp = ipsec_deepcopy_policy(old->sp_in); 1134 if (sp) { 1135 KEY_FREESP(&new->sp_in); 1136 new->sp_in = sp; 1137 } else 1138 return ENOBUFS; 1139 1140 sp = ipsec_deepcopy_policy(old->sp_out); 1141 if (sp) { 1142 KEY_FREESP(&new->sp_out); 1143 new->sp_out = sp; 1144 } else 1145 return ENOBUFS; 1146 1147 new->priv = old->priv; 1148 1149 return 0; 1150 } 1151 1152 /* deep-copy a policy in PCB */ 1153 static struct secpolicy * 1154 ipsec_deepcopy_policy(src) 1155 struct secpolicy *src; 1156 { 1157 struct ipsecrequest *newchain = NULL; 1158 struct ipsecrequest *p; 1159 struct ipsecrequest **q; 1160 struct ipsecrequest *r; 1161 struct secpolicy *dst; 1162 1163 if (src == NULL) 1164 return NULL; 1165 dst = KEY_NEWSP(); 1166 if (dst == NULL) 1167 return NULL; 1168 1169 /* 1170 * deep-copy IPsec request chain. This is required since struct 1171 * ipsecrequest is not reference counted. 1172 */ 1173 q = &newchain; 1174 for (p = src->req; p; p = p->next) { 1175 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 1176 M_SECA, M_NOWAIT); 1177 if (*q == NULL) 1178 goto fail; 1179 bzero(*q, sizeof(**q)); 1180 (*q)->next = NULL; 1181 1182 (*q)->saidx.proto = p->saidx.proto; 1183 (*q)->saidx.mode = p->saidx.mode; 1184 (*q)->level = p->level; 1185 (*q)->saidx.reqid = p->saidx.reqid; 1186 1187 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1188 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1189 1190 (*q)->sav = NULL; 1191 (*q)->sp = dst; 1192 1193 q = &((*q)->next); 1194 } 1195 1196 dst->req = newchain; 1197 dst->state = src->state; 1198 dst->policy = src->policy; 1199 /* do not touch the refcnt fields */ 1200 1201 return dst; 1202 1203 fail: 1204 for (p = newchain; p; p = r) { 1205 r = p->next; 1206 free(p, M_SECA); 1207 p = NULL; 1208 } 1209 return NULL; 1210 } 1211 1212 /* set policy and ipsec request if present. */ 1213 static int 1214 ipsec_set_policy(pcb_sp, optname, request, len, priv) 1215 struct secpolicy **pcb_sp; 1216 int optname; 1217 caddr_t request; 1218 size_t len; 1219 int priv; 1220 { 1221 struct sadb_x_policy *xpl; 1222 struct secpolicy *newsp = NULL; 1223 int error; 1224 1225 /* sanity check. */ 1226 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1227 return EINVAL; 1228 if (len < sizeof(*xpl)) 1229 return EINVAL; 1230 xpl = (struct sadb_x_policy *)request; 1231 1232 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1233 printf("ipsec_set_policy: passed policy\n"); 1234 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1235 1236 /* check policy type */ 1237 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1238 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1239 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1240 return EINVAL; 1241 1242 /* check privileged socket */ 1243 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1244 return EACCES; 1245 1246 /* allocation new SP entry */ 1247 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1248 return error; 1249 1250 newsp->state = IPSEC_SPSTATE_ALIVE; 1251 1252 /* clear old SP and set new SP */ 1253 KEY_FREESP(pcb_sp); 1254 *pcb_sp = newsp; 1255 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1256 printf("ipsec_set_policy: new policy\n"); 1257 kdebug_secpolicy(newsp)); 1258 1259 return 0; 1260 } 1261 1262 static int 1263 ipsec_get_policy(pcb_sp, mp) 1264 struct secpolicy *pcb_sp; 1265 struct mbuf **mp; 1266 { 1267 1268 /* sanity check. */ 1269 if (pcb_sp == NULL || mp == NULL) 1270 return EINVAL; 1271 1272 *mp = key_sp2msg(pcb_sp); 1273 if (!*mp) { 1274 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1275 return ENOBUFS; 1276 } 1277 1278 (*mp)->m_type = MT_DATA; 1279 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1280 printf("ipsec_get_policy:\n"); 1281 kdebug_mbuf(*mp)); 1282 1283 return 0; 1284 } 1285 1286 int 1287 ipsec4_set_policy(inp, optname, request, len, priv) 1288 struct inpcb *inp; 1289 int optname; 1290 caddr_t request; 1291 size_t len; 1292 int priv; 1293 { 1294 struct sadb_x_policy *xpl; 1295 struct secpolicy **pcb_sp; 1296 1297 /* sanity check. */ 1298 if (inp == NULL || request == NULL) 1299 return EINVAL; 1300 if (len < sizeof(*xpl)) 1301 return EINVAL; 1302 xpl = (struct sadb_x_policy *)request; 1303 1304 IPSEC_ASSERT(inp->inp_sp != NULL, 1305 ("ipsec4_set_policy(): null inp->in_sp")); 1306 1307 /* select direction */ 1308 switch (xpl->sadb_x_policy_dir) { 1309 case IPSEC_DIR_INBOUND: 1310 pcb_sp = &inp->inp_sp->sp_in; 1311 break; 1312 case IPSEC_DIR_OUTBOUND: 1313 pcb_sp = &inp->inp_sp->sp_out; 1314 break; 1315 default: 1316 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1317 xpl->sadb_x_policy_dir)); 1318 return EINVAL; 1319 } 1320 1321 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1322 } 1323 1324 int 1325 ipsec4_get_policy(inp, request, len, mp) 1326 struct inpcb *inp; 1327 caddr_t request; 1328 size_t len; 1329 struct mbuf **mp; 1330 { 1331 struct sadb_x_policy *xpl; 1332 struct secpolicy *pcb_sp; 1333 1334 /* sanity check. */ 1335 if (inp == NULL || request == NULL || mp == NULL) 1336 return EINVAL; 1337 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1338 if (len < sizeof(*xpl)) 1339 return EINVAL; 1340 xpl = (struct sadb_x_policy *)request; 1341 1342 /* select direction */ 1343 switch (xpl->sadb_x_policy_dir) { 1344 case IPSEC_DIR_INBOUND: 1345 pcb_sp = inp->inp_sp->sp_in; 1346 break; 1347 case IPSEC_DIR_OUTBOUND: 1348 pcb_sp = inp->inp_sp->sp_out; 1349 break; 1350 default: 1351 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1352 xpl->sadb_x_policy_dir)); 1353 return EINVAL; 1354 } 1355 1356 return ipsec_get_policy(pcb_sp, mp); 1357 } 1358 1359 /* delete policy in PCB */ 1360 int 1361 ipsec4_delete_pcbpolicy(inp) 1362 struct inpcb *inp; 1363 { 1364 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1365 1366 if (inp->inp_sp == NULL) 1367 return 0; 1368 1369 if (inp->inp_sp->sp_in != NULL) 1370 KEY_FREESP(&inp->inp_sp->sp_in); 1371 1372 if (inp->inp_sp->sp_out != NULL) 1373 KEY_FREESP(&inp->inp_sp->sp_out); 1374 1375 ipsec_delpcbpolicy(inp->inp_sp); 1376 inp->inp_sp = NULL; 1377 1378 return 0; 1379 } 1380 1381 #ifdef INET6 1382 int 1383 ipsec6_set_policy(in6p, optname, request, len, priv) 1384 struct in6pcb *in6p; 1385 int optname; 1386 caddr_t request; 1387 size_t len; 1388 int priv; 1389 { 1390 struct sadb_x_policy *xpl; 1391 struct secpolicy **pcb_sp; 1392 1393 /* sanity check. */ 1394 if (in6p == NULL || request == NULL) 1395 return EINVAL; 1396 if (len < sizeof(*xpl)) 1397 return EINVAL; 1398 xpl = (struct sadb_x_policy *)request; 1399 1400 /* select direction */ 1401 switch (xpl->sadb_x_policy_dir) { 1402 case IPSEC_DIR_INBOUND: 1403 pcb_sp = &in6p->in6p_sp->sp_in; 1404 break; 1405 case IPSEC_DIR_OUTBOUND: 1406 pcb_sp = &in6p->in6p_sp->sp_out; 1407 break; 1408 default: 1409 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1410 xpl->sadb_x_policy_dir)); 1411 return EINVAL; 1412 } 1413 1414 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1415 } 1416 1417 int 1418 ipsec6_get_policy(in6p, request, len, mp) 1419 struct in6pcb *in6p; 1420 caddr_t request; 1421 size_t len; 1422 struct mbuf **mp; 1423 { 1424 struct sadb_x_policy *xpl; 1425 struct secpolicy *pcb_sp; 1426 1427 /* sanity check. */ 1428 if (in6p == NULL || request == NULL || mp == NULL) 1429 return EINVAL; 1430 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1431 if (len < sizeof(*xpl)) 1432 return EINVAL; 1433 xpl = (struct sadb_x_policy *)request; 1434 1435 /* select direction */ 1436 switch (xpl->sadb_x_policy_dir) { 1437 case IPSEC_DIR_INBOUND: 1438 pcb_sp = in6p->in6p_sp->sp_in; 1439 break; 1440 case IPSEC_DIR_OUTBOUND: 1441 pcb_sp = in6p->in6p_sp->sp_out; 1442 break; 1443 default: 1444 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1445 xpl->sadb_x_policy_dir)); 1446 return EINVAL; 1447 } 1448 1449 return ipsec_get_policy(pcb_sp, mp); 1450 } 1451 1452 int 1453 ipsec6_delete_pcbpolicy(in6p) 1454 struct in6pcb *in6p; 1455 { 1456 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1457 1458 if (in6p->in6p_sp == NULL) 1459 return 0; 1460 1461 if (in6p->in6p_sp->sp_in != NULL) 1462 KEY_FREESP(&in6p->in6p_sp->sp_in); 1463 1464 if (in6p->in6p_sp->sp_out != NULL) 1465 KEY_FREESP(&in6p->in6p_sp->sp_out); 1466 1467 ipsec_delpcbpolicy(in6p->in6p_sp); 1468 in6p->in6p_sp = NULL; 1469 1470 return 0; 1471 } 1472 #endif 1473 1474 /* 1475 * return current level. 1476 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1477 */ 1478 u_int 1479 ipsec_get_reqlevel(isr) 1480 struct ipsecrequest *isr; 1481 { 1482 u_int level = 0; 1483 u_int esp_trans_deflev, esp_net_deflev; 1484 u_int ah_trans_deflev, ah_net_deflev; 1485 1486 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1487 ("ipsec_get_reqlevel: null argument")); 1488 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1489 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1490 isr->sp->spidx.src.sa.sa_family, 1491 isr->sp->spidx.dst.sa.sa_family)); 1492 1493 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1494 #define IPSEC_CHECK_DEFAULT(lev) \ 1495 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1496 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1497 ? (ipsec_debug \ 1498 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1499 (lev), IPSEC_LEVEL_REQUIRE) \ 1500 : 0), \ 1501 (lev) = IPSEC_LEVEL_REQUIRE, \ 1502 (lev) \ 1503 : (lev)) 1504 1505 /* set default level */ 1506 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1507 #ifdef INET 1508 case AF_INET: 1509 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1510 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1511 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1512 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1513 break; 1514 #endif 1515 #ifdef INET6 1516 case AF_INET6: 1517 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1518 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1519 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1520 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1521 break; 1522 #endif /* INET6 */ 1523 default: 1524 panic("key_get_reqlevel: unknown af %u", 1525 isr->sp->spidx.src.sa.sa_family); 1526 } 1527 1528 #undef IPSEC_CHECK_DEFAULT 1529 1530 /* set level */ 1531 switch (isr->level) { 1532 case IPSEC_LEVEL_DEFAULT: 1533 switch (isr->saidx.proto) { 1534 case IPPROTO_ESP: 1535 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1536 level = esp_net_deflev; 1537 else 1538 level = esp_trans_deflev; 1539 break; 1540 case IPPROTO_AH: 1541 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1542 level = ah_net_deflev; 1543 else 1544 level = ah_trans_deflev; 1545 break; 1546 case IPPROTO_IPCOMP: 1547 /* 1548 * we don't really care, as IPcomp document says that 1549 * we shouldn't compress small packets 1550 */ 1551 level = IPSEC_LEVEL_USE; 1552 break; 1553 default: 1554 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1555 isr->saidx.proto); 1556 } 1557 break; 1558 1559 case IPSEC_LEVEL_USE: 1560 case IPSEC_LEVEL_REQUIRE: 1561 level = isr->level; 1562 break; 1563 case IPSEC_LEVEL_UNIQUE: 1564 level = IPSEC_LEVEL_REQUIRE; 1565 break; 1566 1567 default: 1568 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1569 isr->level); 1570 } 1571 1572 return level; 1573 } 1574 1575 /* 1576 * Check security policy requirements against the actual 1577 * packet contents. Return one if the packet should be 1578 * reject as "invalid"; otherwiser return zero to have the 1579 * packet treated as "valid". 1580 * 1581 * OUT: 1582 * 0: valid 1583 * 1: invalid 1584 */ 1585 int 1586 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1587 { 1588 struct ipsecrequest *isr; 1589 int need_auth; 1590 1591 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1592 printf("ipsec_in_reject: using SP\n"); 1593 kdebug_secpolicy(sp)); 1594 1595 /* check policy */ 1596 switch (sp->policy) { 1597 case IPSEC_POLICY_DISCARD: 1598 return 1; 1599 case IPSEC_POLICY_BYPASS: 1600 case IPSEC_POLICY_NONE: 1601 return 0; 1602 } 1603 1604 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1605 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1606 1607 /* XXX should compare policy against ipsec header history */ 1608 1609 need_auth = 0; 1610 for (isr = sp->req; isr != NULL; isr = isr->next) { 1611 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1612 continue; 1613 switch (isr->saidx.proto) { 1614 case IPPROTO_ESP: 1615 if ((m->m_flags & M_DECRYPTED) == 0) { 1616 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1617 printf("ipsec_in_reject: ESP m_flags:%x\n", 1618 m->m_flags)); 1619 return 1; 1620 } 1621 1622 if (!need_auth && 1623 isr->sav != NULL && 1624 isr->sav->tdb_authalgxform != NULL && 1625 (m->m_flags & M_AUTHIPDGM) == 0) { 1626 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1627 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1628 m->m_flags)); 1629 return 1; 1630 } 1631 break; 1632 case IPPROTO_AH: 1633 need_auth = 1; 1634 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1635 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1636 printf("ipsec_in_reject: AH m_flags:%x\n", 1637 m->m_flags)); 1638 return 1; 1639 } 1640 break; 1641 case IPPROTO_IPCOMP: 1642 /* 1643 * we don't really care, as IPcomp document 1644 * says that we shouldn't compress small 1645 * packets, IPComp policy should always be 1646 * treated as being in "use" level. 1647 */ 1648 break; 1649 } 1650 } 1651 return 0; /* valid */ 1652 } 1653 1654 /* 1655 * Check AH/ESP integrity. 1656 * This function is called from tcp_input(), udp_input(), 1657 * and {ah,esp}4_input for tunnel mode 1658 */ 1659 int 1660 ipsec4_in_reject(m, inp) 1661 struct mbuf *m; 1662 struct inpcb *inp; 1663 { 1664 struct secpolicy *sp; 1665 int error; 1666 int result; 1667 1668 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1669 1670 /* get SP for this packet. 1671 * When we are called from ip_forward(), we call 1672 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1673 */ 1674 if (inp == NULL) 1675 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1676 else 1677 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1678 IN4PCB_TO_PCB(inp), &error); 1679 1680 if (sp != NULL) { 1681 result = ipsec_in_reject(sp, m); 1682 if (result) 1683 newipsecstat.ips_in_polvio++; 1684 KEY_FREESP(&sp); 1685 } else { 1686 result = 0; /* XXX should be panic ? 1687 * -> No, there may be error. */ 1688 } 1689 return result; 1690 } 1691 1692 1693 #ifdef INET6 1694 /* 1695 * Check AH/ESP integrity. 1696 * This function is called from tcp6_input(), udp6_input(), 1697 * and {ah,esp}6_input for tunnel mode 1698 */ 1699 int 1700 ipsec6_in_reject(m, in6p) 1701 struct mbuf *m; 1702 struct in6pcb *in6p; 1703 { 1704 struct secpolicy *sp = NULL; 1705 int error; 1706 int result; 1707 1708 /* sanity check */ 1709 if (m == NULL) 1710 return 0; /* XXX should be panic ? */ 1711 1712 /* get SP for this packet. 1713 * When we are called from ip_forward(), we call 1714 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1715 */ 1716 if (in6p == NULL) 1717 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1718 else 1719 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1720 IN6PCB_TO_PCB(in6p), 1721 &error); 1722 1723 if (sp != NULL) { 1724 result = ipsec_in_reject(sp, m); 1725 if (result) 1726 newipsecstat.ips_in_polvio++; 1727 KEY_FREESP(&sp); 1728 } else { 1729 result = 0; 1730 } 1731 return result; 1732 } 1733 #endif 1734 1735 /* 1736 * compute the byte size to be occupied by IPsec header. 1737 * in case it is tunneled, it includes the size of outer IP header. 1738 * NOTE: SP passed is free in this function. 1739 */ 1740 static size_t 1741 ipsec_hdrsiz(struct secpolicy *sp) 1742 { 1743 struct ipsecrequest *isr; 1744 size_t siz; 1745 1746 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1747 printf("ipsec_hdrsiz: using SP\n"); 1748 kdebug_secpolicy(sp)); 1749 1750 switch (sp->policy) { 1751 case IPSEC_POLICY_DISCARD: 1752 case IPSEC_POLICY_BYPASS: 1753 case IPSEC_POLICY_NONE: 1754 return 0; 1755 } 1756 1757 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1758 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1759 1760 siz = 0; 1761 for (isr = sp->req; isr != NULL; isr = isr->next) { 1762 size_t clen = 0; 1763 1764 switch (isr->saidx.proto) { 1765 case IPPROTO_ESP: 1766 clen = esp_hdrsiz(isr->sav); 1767 break; 1768 case IPPROTO_AH: 1769 clen = ah_hdrsiz(isr->sav); 1770 break; 1771 case IPPROTO_IPCOMP: 1772 clen = sizeof(struct ipcomp); 1773 break; 1774 } 1775 1776 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1777 switch (isr->saidx.dst.sa.sa_family) { 1778 case AF_INET: 1779 clen += sizeof(struct ip); 1780 break; 1781 #ifdef INET6 1782 case AF_INET6: 1783 clen += sizeof(struct ip6_hdr); 1784 break; 1785 #endif 1786 default: 1787 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1788 "unknown AF %d in IPsec tunnel SA\n", 1789 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1790 break; 1791 } 1792 } 1793 siz += clen; 1794 } 1795 1796 return siz; 1797 } 1798 1799 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1800 size_t 1801 ipsec4_hdrsiz(m, dir, inp) 1802 struct mbuf *m; 1803 u_int dir; 1804 struct inpcb *inp; 1805 { 1806 struct secpolicy *sp; 1807 int error; 1808 size_t size; 1809 1810 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1811 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1812 ("ipsec4_hdrsize: socket w/o inpcb")); 1813 1814 /* get SP for this packet. 1815 * When we are called from ip_forward(), we call 1816 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1817 */ 1818 if (inp == NULL) 1819 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1820 else 1821 sp = ipsec_getpolicybysock(m, dir, 1822 IN4PCB_TO_PCB(inp), &error); 1823 1824 if (sp != NULL) { 1825 size = ipsec_hdrsiz(sp); 1826 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1827 printf("ipsec4_hdrsiz: size:%lu.\n", 1828 (unsigned long)size)); 1829 1830 KEY_FREESP(&sp); 1831 } else { 1832 size = 0; /* XXX should be panic ? */ 1833 } 1834 return size; 1835 } 1836 1837 #ifdef INET6 1838 /* This function is called from ipsec6_hdrsize_tcp(), 1839 * and maybe from ip6_forward.() 1840 */ 1841 size_t 1842 ipsec6_hdrsiz(m, dir, in6p) 1843 struct mbuf *m; 1844 u_int dir; 1845 struct in6pcb *in6p; 1846 { 1847 struct secpolicy *sp; 1848 int error; 1849 size_t size; 1850 1851 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1852 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1853 ("ipsec6_hdrsize: socket w/o inpcb")); 1854 1855 /* get SP for this packet */ 1856 /* XXX Is it right to call with IP_FORWARDING. */ 1857 if (in6p == NULL) 1858 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1859 else 1860 sp = ipsec_getpolicybysock(m, dir, 1861 IN6PCB_TO_PCB(in6p), 1862 &error); 1863 1864 if (sp == NULL) 1865 return 0; 1866 size = ipsec_hdrsiz(sp); 1867 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1868 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1869 KEY_FREESP(&sp); 1870 1871 return size; 1872 } 1873 #endif /*INET6*/ 1874 1875 /* 1876 * Check the variable replay window. 1877 * ipsec_chkreplay() performs replay check before ICV verification. 1878 * ipsec_updatereplay() updates replay bitmap. This must be called after 1879 * ICV verification (it also performs replay check, which is usually done 1880 * beforehand). 1881 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1882 * 1883 * based on RFC 2401. 1884 */ 1885 int 1886 ipsec_chkreplay(seq, sav) 1887 u_int32_t seq; 1888 struct secasvar *sav; 1889 { 1890 const struct secreplay *replay; 1891 u_int32_t diff; 1892 int fr; 1893 u_int32_t wsizeb; /* constant: bits of window size */ 1894 int frlast; /* constant: last frame */ 1895 1896 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 1897 1898 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1899 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1900 1901 replay = sav->replay; 1902 1903 if (replay->wsize == 0) 1904 return 1; /* no need to check replay. */ 1905 1906 /* constant */ 1907 frlast = replay->wsize - 1; 1908 wsizeb = replay->wsize << 3; 1909 1910 /* sequence number of 0 is invalid */ 1911 if (seq == 0) 1912 return 0; 1913 1914 /* first time is always okay */ 1915 if (replay->count == 0) 1916 return 1; 1917 1918 if (seq > replay->lastseq) { 1919 /* larger sequences are okay */ 1920 return 1; 1921 } else { 1922 /* seq is equal or less than lastseq. */ 1923 diff = replay->lastseq - seq; 1924 1925 /* over range to check, i.e. too old or wrapped */ 1926 if (diff >= wsizeb) 1927 return 0; 1928 1929 fr = frlast - diff / 8; 1930 1931 /* this packet already seen ? */ 1932 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1933 return 0; 1934 1935 /* out of order but good */ 1936 return 1; 1937 } 1938 } 1939 1940 /* 1941 * check replay counter whether to update or not. 1942 * OUT: 0: OK 1943 * 1: NG 1944 */ 1945 int 1946 ipsec_updatereplay(seq, sav) 1947 u_int32_t seq; 1948 struct secasvar *sav; 1949 { 1950 struct secreplay *replay; 1951 u_int32_t diff; 1952 int fr; 1953 u_int32_t wsizeb; /* constant: bits of window size */ 1954 int frlast; /* constant: last frame */ 1955 1956 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 1957 1958 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 1959 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 1960 1961 replay = sav->replay; 1962 1963 if (replay->wsize == 0) 1964 goto ok; /* no need to check replay. */ 1965 1966 /* constant */ 1967 frlast = replay->wsize - 1; 1968 wsizeb = replay->wsize << 3; 1969 1970 /* sequence number of 0 is invalid */ 1971 if (seq == 0) 1972 return 1; 1973 1974 /* first time */ 1975 if (replay->count == 0) { 1976 replay->lastseq = seq; 1977 bzero(replay->bitmap, replay->wsize); 1978 (replay->bitmap)[frlast] = 1; 1979 goto ok; 1980 } 1981 1982 if (seq > replay->lastseq) { 1983 /* seq is larger than lastseq. */ 1984 diff = seq - replay->lastseq; 1985 1986 /* new larger sequence number */ 1987 if (diff < wsizeb) { 1988 /* In window */ 1989 /* set bit for this packet */ 1990 vshiftl(replay->bitmap, diff, replay->wsize); 1991 (replay->bitmap)[frlast] |= 1; 1992 } else { 1993 /* this packet has a "way larger" */ 1994 bzero(replay->bitmap, replay->wsize); 1995 (replay->bitmap)[frlast] = 1; 1996 } 1997 replay->lastseq = seq; 1998 1999 /* larger is good */ 2000 } else { 2001 /* seq is equal or less than lastseq. */ 2002 diff = replay->lastseq - seq; 2003 2004 /* over range to check, i.e. too old or wrapped */ 2005 if (diff >= wsizeb) 2006 return 1; 2007 2008 fr = frlast - diff / 8; 2009 2010 /* this packet already seen ? */ 2011 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2012 return 1; 2013 2014 /* mark as seen */ 2015 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2016 2017 /* out of order but good */ 2018 } 2019 2020 ok: 2021 if (replay->count == ~0) { 2022 2023 /* set overflow flag */ 2024 replay->overflow++; 2025 2026 /* don't increment, no more packets accepted */ 2027 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2028 return 1; 2029 2030 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2031 replay->overflow, ipsec_logsastr(sav))); 2032 } 2033 2034 replay->count++; 2035 2036 return 0; 2037 } 2038 2039 /* 2040 * shift variable length bunffer to left. 2041 * IN: bitmap: pointer to the buffer 2042 * nbit: the number of to shift. 2043 * wsize: buffer size (bytes). 2044 */ 2045 static void 2046 vshiftl(bitmap, nbit, wsize) 2047 unsigned char *bitmap; 2048 int nbit, wsize; 2049 { 2050 int s, j, i; 2051 unsigned char over; 2052 2053 for (j = 0; j < nbit; j += 8) { 2054 s = (nbit - j < 8) ? (nbit - j): 8; 2055 bitmap[0] <<= s; 2056 for (i = 1; i < wsize; i++) { 2057 over = (bitmap[i] >> (8 - s)); 2058 bitmap[i] <<= s; 2059 bitmap[i-1] |= over; 2060 } 2061 } 2062 2063 return; 2064 } 2065 2066 /* Return a printable string for the IPv4 address. */ 2067 static char * 2068 inet_ntoa4(struct in_addr ina) 2069 { 2070 static char buf[4][4 * sizeof "123" + 4]; 2071 unsigned char *ucp = (unsigned char *) &ina; 2072 static int i = 3; 2073 2074 i = (i + 1) % 4; 2075 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2076 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2077 return (buf[i]); 2078 } 2079 2080 /* Return a printable string for the address. */ 2081 char * 2082 ipsec_address(union sockaddr_union* sa) 2083 { 2084 switch (sa->sa.sa_family) { 2085 #if INET 2086 case AF_INET: 2087 return inet_ntoa4(sa->sin.sin_addr); 2088 #endif /* INET */ 2089 2090 #if INET6 2091 case AF_INET6: 2092 return ip6_sprintf(&sa->sin6.sin6_addr); 2093 #endif /* INET6 */ 2094 2095 default: 2096 return "(unknown address family)"; 2097 } 2098 } 2099 2100 const char * 2101 ipsec_logsastr(sav) 2102 struct secasvar *sav; 2103 { 2104 static char buf[256]; 2105 char *p; 2106 struct secasindex *saidx = &sav->sah->saidx; 2107 2108 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2109 ("ipsec_logsastr: address family mismatch")); 2110 2111 p = buf; 2112 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2113 while (p && *p) 2114 p++; 2115 /* NB: only use ipsec_address on one address at a time */ 2116 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2117 ipsec_address(&saidx->src)); 2118 while (p && *p) 2119 p++; 2120 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2121 ipsec_address(&saidx->dst)); 2122 2123 return buf; 2124 } 2125 2126 void 2127 ipsec_dumpmbuf(m) 2128 struct mbuf *m; 2129 { 2130 int totlen; 2131 int i; 2132 u_char *p; 2133 2134 totlen = 0; 2135 printf("---\n"); 2136 while (m) { 2137 p = mtod(m, u_char *); 2138 for (i = 0; i < m->m_len; i++) { 2139 printf("%02x ", p[i]); 2140 totlen++; 2141 if (totlen % 16 == 0) 2142 printf("\n"); 2143 } 2144 m = m->m_next; 2145 } 2146 if (totlen % 16 != 0) 2147 printf("\n"); 2148 printf("---\n"); 2149 } 2150 2151 /* XXX this stuff doesn't belong here... */ 2152 2153 static struct xformsw* xforms = NULL; 2154 2155 /* 2156 * Register a transform; typically at system startup. 2157 */ 2158 void 2159 xform_register(struct xformsw* xsp) 2160 { 2161 xsp->xf_next = xforms; 2162 xforms = xsp; 2163 } 2164 2165 /* 2166 * Initialize transform support in an sav. 2167 */ 2168 int 2169 xform_init(struct secasvar *sav, int xftype) 2170 { 2171 struct xformsw *xsp; 2172 2173 if (sav->tdb_xform != NULL) /* previously initialized */ 2174 return 0; 2175 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2176 if (xsp->xf_type == xftype) 2177 return (*xsp->xf_init)(sav, xsp); 2178 2179 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2180 return EINVAL; 2181 } 2182 2183 #ifdef __NetBSD__ 2184 void 2185 ipsec_attach(void) 2186 { 2187 printf("initializing IPsec..."); 2188 ah_attach(); 2189 esp_attach(); 2190 ipcomp_attach(); 2191 ipe4_attach(); 2192 #ifdef TCP_SIGNATURE 2193 tcpsignature_attach(); 2194 #endif 2195 printf(" done\n"); 2196 } 2197 #endif /* __NetBSD__ */ 2198
Indexes created Sun Sep 21 18:09:52 GMT 2025