ipsec.c revision 125100
1/* $FreeBSD: head/sys/netipsec/ipsec.c 125100 2004-01-27 17:45:28Z sam $ */ 2/* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * IPsec controller part. 35 */ 36 37#include "opt_inet.h" 38#include "opt_inet6.h" 39#include "opt_ipsec.h" 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/malloc.h> 44#include <sys/mbuf.h> 45#include <sys/domain.h> 46#include <sys/protosw.h> 47#include <sys/socket.h> 48#include <sys/socketvar.h> 49#include <sys/errno.h> 50#include <sys/time.h> 51#include <sys/kernel.h> 52#include <sys/syslog.h> 53#include <sys/sysctl.h> 54#include <sys/proc.h> 55 56#include <net/if.h> 57#include <net/route.h> 58 59#include <netinet/in.h> 60#include <netinet/in_systm.h> 61#include <netinet/ip.h> 62#include <netinet/ip_var.h> 63#include <netinet/in_var.h> 64#include <netinet/udp.h> 65#include <netinet/udp_var.h> 66#include <netinet/tcp.h> 67#include <netinet/udp.h> 68 69#include <netinet/ip6.h> 70#ifdef INET6 71#include <netinet6/ip6_var.h> 72#endif 73#include <netinet/in_pcb.h> 74#ifdef INET6 75#include <netinet/icmp6.h> 76#endif 77 78#include <netipsec/ipsec.h> 79#ifdef INET6 80#include <netipsec/ipsec6.h> 81#endif 82#include <netipsec/ah_var.h> 83#include <netipsec/esp_var.h> 84#include <netipsec/ipcomp.h> /*XXX*/ 85#include <netipsec/ipcomp_var.h> 86 87#include <netipsec/key.h> 88#include <netipsec/keydb.h> 89#include <netipsec/key_debug.h> 90 91#include <netipsec/xform.h> 92 93#include <machine/in_cksum.h> 94 95#ifdef IPSEC_DEBUG 96int ipsec_debug = 1; 97#else 98int ipsec_debug = 0; 99#endif 100 101/* NB: name changed so netstat doesn't use it */ 102struct newipsecstat newipsecstat; 103int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 104int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 105int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 106int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 107int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 108int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 109struct secpolicy ip4_def_policy; 110int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 111int ip4_esp_randpad = -1; 112/* 113 * Crypto support requirements: 114 * 115 * 1 require hardware support 116 * -1 require software support 117 * 0 take anything 118 */ 119int crypto_support = 0; 120 121SYSCTL_DECL(_net_inet_ipsec); 122 123/* net.inet.ipsec */ 124SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 125 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 126SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 127 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 128SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 129 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 130SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 131 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 132SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 133 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 134SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 135 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 136SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 137 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 138SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 139 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 140SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 141 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 142SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 143 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 144SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 145 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 146SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 147 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 148SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 149 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 150 151#ifdef INET6 152int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 153int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 154int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 155int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 156int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 157int ip6_esp_randpad = -1; 158 159SYSCTL_DECL(_net_inet6_ipsec6); 160 161/* net.inet6.ipsec6 */ 162#ifdef COMPAT_KAME 163SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 164 0,0, compat_ipsecstats_sysctl, "S", ""); 165#endif /* COMPAT_KAME */ 166SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 167 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 168SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 169 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 170SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 171 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 172SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 173 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 174SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 175 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 176SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 177 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 178SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 179 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 180SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 181 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 182#endif /* INET6 */ 183 184static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 185#ifdef INET6 186static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 187#endif 188static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 189static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 190static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 191#ifdef INET6 192static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 193static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 194#endif 195static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 196static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 197static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 198 int optname, caddr_t request, size_t len, int priv)); 199static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 200static void vshiftl __P((unsigned char *, int, int)); 201static size_t ipsec_hdrsiz __P((struct secpolicy *)); 202 203MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 204 205/* 206 * Return a held reference to the default SP. 207 */ 208static struct secpolicy * 209key_allocsp_default(const char* where, int tag) 210{ 211 struct secpolicy *sp; 212 213 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 214 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 215 216 sp = &ip4_def_policy; 217 if (sp->policy != IPSEC_POLICY_DISCARD && 218 sp->policy != IPSEC_POLICY_NONE) { 219 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 220 sp->policy, IPSEC_POLICY_NONE)); 221 sp->policy = IPSEC_POLICY_NONE; 222 } 223 sp->refcnt++; 224 225 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 226 printf("DP key_allocsp_default returns SP:%p (%u)\n", 227 sp, sp->refcnt)); 228 return sp; 229} 230#define KEY_ALLOCSP_DEFAULT() \ 231 key_allocsp_default(__FILE__, __LINE__) 232 233/* 234 * For OUTBOUND packet having a socket. Searching SPD for packet, 235 * and return a pointer to SP. 236 * OUT: NULL: no apropreate SP found, the following value is set to error. 237 * 0 : bypass 238 * EACCES : discard packet. 239 * ENOENT : ipsec_acquire() in progress, maybe. 240 * others : error occured. 241 * others: a pointer to SP 242 * 243 * NOTE: IPv6 mapped adddress concern is implemented here. 244 */ 245struct secpolicy * 246ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 247{ 248 struct secpolicy *sp; 249 250 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 251 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 252 ("invalid direction %u", dir)); 253 254 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 255 if (sp == NULL) /*XXX????*/ 256 sp = KEY_ALLOCSP_DEFAULT(); 257 IPSEC_ASSERT(sp != NULL, ("null SP")); 258 return sp; 259} 260 261/* 262 * For OUTBOUND packet having a socket. Searching SPD for packet, 263 * and return a pointer to SP. 264 * OUT: NULL: no apropreate SP found, the following value is set to error. 265 * 0 : bypass 266 * EACCES : discard packet. 267 * ENOENT : ipsec_acquire() in progress, maybe. 268 * others : error occured. 269 * others: a pointer to SP 270 * 271 * NOTE: IPv6 mapped adddress concern is implemented here. 272 */ 273struct secpolicy * 274ipsec_getpolicybysock(m, dir, inp, error) 275 struct mbuf *m; 276 u_int dir; 277 struct inpcb *inp; 278 int *error; 279{ 280 struct inpcbpolicy *pcbsp = NULL; 281 struct secpolicy *currsp = NULL; /* policy on socket */ 282 struct secpolicy *sp; 283 284 IPSEC_ASSERT(m != NULL, ("null mbuf")); 285 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 286 IPSEC_ASSERT(error != NULL, ("null error")); 287 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 288 ("invalid direction %u", dir)); 289 290 /* set spidx in pcb */ 291 if (inp->inp_vflag & INP_IPV6PROTO) { 292#ifdef INET6 293 *error = ipsec6_setspidx_in6pcb(m, inp); 294 pcbsp = inp->in6p_sp; 295#else 296 *error = EINVAL; /* should not happen */ 297#endif 298 } else { 299 *error = ipsec4_setspidx_inpcb(m, inp); 300 pcbsp = inp->inp_sp; 301 } 302 if (*error) 303 return NULL; 304 305 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 306 switch (dir) { 307 case IPSEC_DIR_INBOUND: 308 currsp = pcbsp->sp_in; 309 break; 310 case IPSEC_DIR_OUTBOUND: 311 currsp = pcbsp->sp_out; 312 break; 313 } 314 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 315 316 if (pcbsp->priv) { /* when privilieged socket */ 317 switch (currsp->policy) { 318 case IPSEC_POLICY_BYPASS: 319 case IPSEC_POLICY_IPSEC: 320 currsp->refcnt++; 321 sp = currsp; 322 break; 323 324 case IPSEC_POLICY_ENTRUST: 325 /* look for a policy in SPD */ 326 sp = KEY_ALLOCSP(&currsp->spidx, dir); 327 if (sp == NULL) /* no SP found */ 328 sp = KEY_ALLOCSP_DEFAULT(); 329 break; 330 331 default: 332 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 333 __func__, currsp->policy)); 334 *error = EINVAL; 335 return NULL; 336 } 337 } else { /* unpriv, SPD has policy */ 338 sp = KEY_ALLOCSP(&currsp->spidx, dir); 339 if (sp == NULL) { /* no SP found */ 340 switch (currsp->policy) { 341 case IPSEC_POLICY_BYPASS: 342 ipseclog((LOG_ERR, "%s: Illegal policy for " 343 "non-priviliged defined %d\n", 344 __func__, currsp->policy)); 345 *error = EINVAL; 346 return NULL; 347 348 case IPSEC_POLICY_ENTRUST: 349 sp = KEY_ALLOCSP_DEFAULT(); 350 break; 351 352 case IPSEC_POLICY_IPSEC: 353 currsp->refcnt++; 354 sp = currsp; 355 break; 356 357 default: 358 ipseclog((LOG_ERR, "%s: Invalid policy for " 359 "PCB %d\n", __func__, currsp->policy)); 360 *error = EINVAL; 361 return NULL; 362 } 363 } 364 } 365 IPSEC_ASSERT(sp != NULL, 366 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 367 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 368 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 369 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 370 return sp; 371} 372 373/* 374 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 375 * and return a pointer to SP. 376 * OUT: positive: a pointer to the entry for security policy leaf matched. 377 * NULL: no apropreate SP found, the following value is set to error. 378 * 0 : bypass 379 * EACCES : discard packet. 380 * ENOENT : ipsec_acquire() in progress, maybe. 381 * others : error occured. 382 */ 383struct secpolicy * 384ipsec_getpolicybyaddr(m, dir, flag, error) 385 struct mbuf *m; 386 u_int dir; 387 int flag; 388 int *error; 389{ 390 struct secpolicyindex spidx; 391 struct secpolicy *sp; 392 393 IPSEC_ASSERT(m != NULL, ("null mbuf")); 394 IPSEC_ASSERT(error != NULL, ("null error")); 395 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 396 ("invalid direction %u", dir)); 397 398 sp = NULL; 399 if (key_havesp(dir)) { 400 /* Make an index to look for a policy. */ 401 *error = ipsec_setspidx(m, &spidx, 402 (flag & IP_FORWARDING) ? 0 : 1); 403 if (*error != 0) { 404 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 405 __func__, dir, flag)); 406 return NULL; 407 } 408 spidx.dir = dir; 409 410 sp = KEY_ALLOCSP(&spidx, dir); 411 } 412 if (sp == NULL) /* no SP found, use system default */ 413 sp = KEY_ALLOCSP_DEFAULT(); 414 IPSEC_ASSERT(sp != NULL, ("null SP")); 415 return sp; 416} 417 418struct secpolicy * 419ipsec4_checkpolicy(m, dir, flag, error, inp) 420 struct mbuf *m; 421 u_int dir, flag; 422 int *error; 423 struct inpcb *inp; 424{ 425 struct secpolicy *sp; 426 427 *error = 0; 428 if (inp == NULL) 429 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 430 else 431 sp = ipsec_getpolicybysock(m, dir, inp, error); 432 if (sp == NULL) { 433 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 434 newipsecstat.ips_out_inval++; 435 return NULL; 436 } 437 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 438 switch (sp->policy) { 439 case IPSEC_POLICY_ENTRUST: 440 default: 441 printf("%s: invalid policy %u\n", __func__, sp->policy); 442 /* fall thru... */ 443 case IPSEC_POLICY_DISCARD: 444 newipsecstat.ips_out_polvio++; 445 *error = -EINVAL; /* packet is discarded by caller */ 446 break; 447 case IPSEC_POLICY_BYPASS: 448 case IPSEC_POLICY_NONE: 449 KEY_FREESP(&sp); 450 sp = NULL; /* NB: force NULL result */ 451 break; 452 case IPSEC_POLICY_IPSEC: 453 if (sp->req == NULL) /* acquire an SA */ 454 *error = key_spdacquire(sp); 455 break; 456 } 457 if (*error != 0) { 458 KEY_FREESP(&sp); 459 sp = NULL; 460 } 461 return sp; 462} 463 464static int 465ipsec4_setspidx_inpcb(m, pcb) 466 struct mbuf *m; 467 struct inpcb *pcb; 468{ 469 int error; 470 471 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 472 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 473 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 474 ("null sp_in || sp_out")); 475 476 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 477 if (error == 0) { 478 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 479 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 480 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 481 } else { 482 bzero(&pcb->inp_sp->sp_in->spidx, 483 sizeof (pcb->inp_sp->sp_in->spidx)); 484 bzero(&pcb->inp_sp->sp_out->spidx, 485 sizeof (pcb->inp_sp->sp_in->spidx)); 486 } 487 return error; 488} 489 490#ifdef INET6 491static int 492ipsec6_setspidx_in6pcb(m, pcb) 493 struct mbuf *m; 494 struct in6pcb *pcb; 495{ 496 struct secpolicyindex *spidx; 497 int error; 498 499 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 500 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 501 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 502 ("null sp_in || sp_out")); 503 504 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 505 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 506 507 spidx = &pcb->in6p_sp->sp_in->spidx; 508 error = ipsec_setspidx(m, spidx, 1); 509 if (error) 510 goto bad; 511 spidx->dir = IPSEC_DIR_INBOUND; 512 513 spidx = &pcb->in6p_sp->sp_out->spidx; 514 error = ipsec_setspidx(m, spidx, 1); 515 if (error) 516 goto bad; 517 spidx->dir = IPSEC_DIR_OUTBOUND; 518 519 return 0; 520 521bad: 522 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 523 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 524 return error; 525} 526#endif 527 528/* 529 * configure security policy index (src/dst/proto/sport/dport) 530 * by looking at the content of mbuf. 531 * the caller is responsible for error recovery (like clearing up spidx). 532 */ 533static int 534ipsec_setspidx(m, spidx, needport) 535 struct mbuf *m; 536 struct secpolicyindex *spidx; 537 int needport; 538{ 539 struct ip *ip = NULL; 540 struct ip ipbuf; 541 u_int v; 542 struct mbuf *n; 543 int len; 544 int error; 545 546 IPSEC_ASSERT(m != NULL, ("null mbuf")); 547 548 /* 549 * validate m->m_pkthdr.len. we see incorrect length if we 550 * mistakenly call this function with inconsistent mbuf chain 551 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 552 */ 553 len = 0; 554 for (n = m; n; n = n->m_next) 555 len += n->m_len; 556 if (m->m_pkthdr.len != len) { 557 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 558 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 559 __func__, len, m->m_pkthdr.len)); 560 return EINVAL; 561 } 562 563 if (m->m_pkthdr.len < sizeof(struct ip)) { 564 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 565 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 566 __func__, m->m_pkthdr.len)); 567 return EINVAL; 568 } 569 570 if (m->m_len >= sizeof(*ip)) 571 ip = mtod(m, struct ip *); 572 else { 573 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 574 ip = &ipbuf; 575 } 576#ifdef _IP_VHL 577 v = _IP_VHL_V(ip->ip_vhl); 578#else 579 v = ip->ip_v; 580#endif 581 switch (v) { 582 case 4: 583 error = ipsec4_setspidx_ipaddr(m, spidx); 584 if (error) 585 return error; 586 ipsec4_get_ulp(m, spidx, needport); 587 return 0; 588#ifdef INET6 589 case 6: 590 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 591 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 592 printf("%s: pkthdr len(%d) too small (v6), " 593 "ignored\n", __func__, m->m_pkthdr.len)); 594 return EINVAL; 595 } 596 error = ipsec6_setspidx_ipaddr(m, spidx); 597 if (error) 598 return error; 599 ipsec6_get_ulp(m, spidx, needport); 600 return 0; 601#endif 602 default: 603 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 604 printf("%s: " "unknown IP version %u, ignored.\n", 605 __func__, v)); 606 return EINVAL; 607 } 608} 609 610static void 611ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 612{ 613 u_int8_t nxt; 614 int off; 615 616 /* sanity check */ 617 IPSEC_ASSERT(m != NULL, ("null mbuf")); 618 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 619 620 /* NB: ip_input() flips it into host endian XXX need more checking */ 621 if (m->m_len < sizeof (struct ip)) { 622 struct ip *ip = mtod(m, struct ip *); 623 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 624 goto done; 625#ifdef _IP_VHL 626 off = _IP_VHL_HL(ip->ip_vhl) << 2; 627#else 628 off = ip->ip_hl << 2; 629#endif 630 nxt = ip->ip_p; 631 } else { 632 struct ip ih; 633 634 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 635 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 636 goto done; 637#ifdef _IP_VHL 638 off = _IP_VHL_HL(ih.ip_vhl) << 2; 639#else 640 off = ih.ip_hl << 2; 641#endif 642 nxt = ih.ip_p; 643 } 644 645 while (off < m->m_pkthdr.len) { 646 struct ip6_ext ip6e; 647 struct tcphdr th; 648 struct udphdr uh; 649 650 switch (nxt) { 651 case IPPROTO_TCP: 652 spidx->ul_proto = nxt; 653 if (!needport) 654 goto done_proto; 655 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 656 goto done; 657 m_copydata(m, off, sizeof (th), (caddr_t) &th); 658 spidx->src.sin.sin_port = th.th_sport; 659 spidx->dst.sin.sin_port = th.th_dport; 660 return; 661 case IPPROTO_UDP: 662 spidx->ul_proto = nxt; 663 if (!needport) 664 goto done_proto; 665 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 666 goto done; 667 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 668 spidx->src.sin.sin_port = uh.uh_sport; 669 spidx->dst.sin.sin_port = uh.uh_dport; 670 return; 671 case IPPROTO_AH: 672 if (m->m_pkthdr.len > off + sizeof(ip6e)) 673 goto done; 674 /* XXX sigh, this works but is totally bogus */ 675 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 676 off += (ip6e.ip6e_len + 2) << 2; 677 nxt = ip6e.ip6e_nxt; 678 break; 679 case IPPROTO_ICMP: 680 default: 681 /* XXX intermediate headers??? */ 682 spidx->ul_proto = nxt; 683 goto done_proto; 684 } 685 } 686done: 687 spidx->ul_proto = IPSEC_ULPROTO_ANY; 688done_proto: 689 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 690 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 691} 692 693/* assumes that m is sane */ 694static int 695ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 696{ 697 static const struct sockaddr_in template = { 698 sizeof (struct sockaddr_in), 699 AF_INET, 700 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 701 }; 702 703 spidx->src.sin = template; 704 spidx->dst.sin = template; 705 706 if (m->m_len < sizeof (struct ip)) { 707 m_copydata(m, offsetof(struct ip, ip_src), 708 sizeof (struct in_addr), 709 (caddr_t) &spidx->src.sin.sin_addr); 710 m_copydata(m, offsetof(struct ip, ip_dst), 711 sizeof (struct in_addr), 712 (caddr_t) &spidx->dst.sin.sin_addr); 713 } else { 714 struct ip *ip = mtod(m, struct ip *); 715 spidx->src.sin.sin_addr = ip->ip_src; 716 spidx->dst.sin.sin_addr = ip->ip_dst; 717 } 718 719 spidx->prefs = sizeof(struct in_addr) << 3; 720 spidx->prefd = sizeof(struct in_addr) << 3; 721 722 return 0; 723} 724 725#ifdef INET6 726static void 727ipsec6_get_ulp(m, spidx, needport) 728 struct mbuf *m; 729 struct secpolicyindex *spidx; 730 int needport; 731{ 732 int off, nxt; 733 struct tcphdr th; 734 struct udphdr uh; 735 736 /* sanity check */ 737 if (m == NULL) 738 panic("%s: NULL pointer was passed.\n", __func__); 739 740 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 741 printf("%s:\n", __func__); kdebug_mbuf(m)); 742 743 /* set default */ 744 spidx->ul_proto = IPSEC_ULPROTO_ANY; 745 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 746 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 747 748 nxt = -1; 749 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 750 if (off < 0 || m->m_pkthdr.len < off) 751 return; 752 753 switch (nxt) { 754 case IPPROTO_TCP: 755 spidx->ul_proto = nxt; 756 if (!needport) 757 break; 758 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 759 break; 760 m_copydata(m, off, sizeof(th), (caddr_t)&th); 761 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 762 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 763 break; 764 case IPPROTO_UDP: 765 spidx->ul_proto = nxt; 766 if (!needport) 767 break; 768 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 769 break; 770 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 771 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 772 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 773 break; 774 case IPPROTO_ICMPV6: 775 default: 776 /* XXX intermediate headers??? */ 777 spidx->ul_proto = nxt; 778 break; 779 } 780} 781 782/* assumes that m is sane */ 783static int 784ipsec6_setspidx_ipaddr(m, spidx) 785 struct mbuf *m; 786 struct secpolicyindex *spidx; 787{ 788 struct ip6_hdr *ip6 = NULL; 789 struct ip6_hdr ip6buf; 790 struct sockaddr_in6 *sin6; 791 792 if (m->m_len >= sizeof(*ip6)) 793 ip6 = mtod(m, struct ip6_hdr *); 794 else { 795 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 796 ip6 = &ip6buf; 797 } 798 799 sin6 = (struct sockaddr_in6 *)&spidx->src; 800 bzero(sin6, sizeof(*sin6)); 801 sin6->sin6_family = AF_INET6; 802 sin6->sin6_len = sizeof(struct sockaddr_in6); 803 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 804 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 805 sin6->sin6_addr.s6_addr16[1] = 0; 806 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 807 } 808 spidx->prefs = sizeof(struct in6_addr) << 3; 809 810 sin6 = (struct sockaddr_in6 *)&spidx->dst; 811 bzero(sin6, sizeof(*sin6)); 812 sin6->sin6_family = AF_INET6; 813 sin6->sin6_len = sizeof(struct sockaddr_in6); 814 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 815 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 816 sin6->sin6_addr.s6_addr16[1] = 0; 817 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 818 } 819 spidx->prefd = sizeof(struct in6_addr) << 3; 820 821 return 0; 822} 823#endif 824 825static void 826ipsec_delpcbpolicy(p) 827 struct inpcbpolicy *p; 828{ 829 free(p, M_IPSEC_INPCB); 830} 831 832/* initialize policy in PCB */ 833int 834ipsec_init_policy(so, pcb_sp) 835 struct socket *so; 836 struct inpcbpolicy **pcb_sp; 837{ 838 struct inpcbpolicy *new; 839 840 /* sanity check. */ 841 if (so == NULL || pcb_sp == NULL) 842 panic("%s: NULL pointer was passed.\n", __func__); 843 844 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 845 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 846 if (new == NULL) { 847 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 848 return ENOBUFS; 849 } 850 851 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 852 853 if ((new->sp_in = KEY_NEWSP()) == NULL) { 854 ipsec_delpcbpolicy(new); 855 return ENOBUFS; 856 } 857 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 858 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 859 860 if ((new->sp_out = KEY_NEWSP()) == NULL) { 861 KEY_FREESP(&new->sp_in); 862 ipsec_delpcbpolicy(new); 863 return ENOBUFS; 864 } 865 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 866 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 867 868 *pcb_sp = new; 869 870 return 0; 871} 872 873/* copy old ipsec policy into new */ 874int 875ipsec_copy_policy(old, new) 876 struct inpcbpolicy *old, *new; 877{ 878 struct secpolicy *sp; 879 880 sp = ipsec_deepcopy_policy(old->sp_in); 881 if (sp) { 882 KEY_FREESP(&new->sp_in); 883 new->sp_in = sp; 884 } else 885 return ENOBUFS; 886 887 sp = ipsec_deepcopy_policy(old->sp_out); 888 if (sp) { 889 KEY_FREESP(&new->sp_out); 890 new->sp_out = sp; 891 } else 892 return ENOBUFS; 893 894 new->priv = old->priv; 895 896 return 0; 897} 898 899struct ipsecrequest * 900ipsec_newisr(void) 901{ 902 struct ipsecrequest *p; 903 904 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 905 if (p != NULL) 906 IPSECREQUEST_LOCK_INIT(p); 907 return p; 908} 909 910void 911ipsec_delisr(struct ipsecrequest *p) 912{ 913 IPSECREQUEST_LOCK_DESTROY(p); 914 free(p, M_IPSEC_SR); 915} 916 917/* deep-copy a policy in PCB */ 918static struct secpolicy * 919ipsec_deepcopy_policy(src) 920 struct secpolicy *src; 921{ 922 struct ipsecrequest *newchain = NULL; 923 struct ipsecrequest *p; 924 struct ipsecrequest **q; 925 struct ipsecrequest *r; 926 struct secpolicy *dst; 927 928 if (src == NULL) 929 return NULL; 930 dst = KEY_NEWSP(); 931 if (dst == NULL) 932 return NULL; 933 934 /* 935 * deep-copy IPsec request chain. This is required since struct 936 * ipsecrequest is not reference counted. 937 */ 938 q = &newchain; 939 for (p = src->req; p; p = p->next) { 940 *q = ipsec_newisr(); 941 if (*q == NULL) 942 goto fail; 943 (*q)->saidx.proto = p->saidx.proto; 944 (*q)->saidx.mode = p->saidx.mode; 945 (*q)->level = p->level; 946 (*q)->saidx.reqid = p->saidx.reqid; 947 948 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 949 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 950 951 (*q)->sp = dst; 952 953 q = &((*q)->next); 954 } 955 956 dst->req = newchain; 957 dst->state = src->state; 958 dst->policy = src->policy; 959 /* do not touch the refcnt fields */ 960 961 return dst; 962 963fail: 964 for (p = newchain; p; p = r) { 965 r = p->next; 966 ipsec_delisr(p); 967 p = NULL; 968 } 969 return NULL; 970} 971 972/* set policy and ipsec request if present. */ 973static int 974ipsec_set_policy(pcb_sp, optname, request, len, priv) 975 struct secpolicy **pcb_sp; 976 int optname; 977 caddr_t request; 978 size_t len; 979 int priv; 980{ 981 struct sadb_x_policy *xpl; 982 struct secpolicy *newsp = NULL; 983 int error; 984 985 /* sanity check. */ 986 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 987 return EINVAL; 988 if (len < sizeof(*xpl)) 989 return EINVAL; 990 xpl = (struct sadb_x_policy *)request; 991 992 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 993 printf("%s: passed policy\n", __func__); 994 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 995 996 /* check policy type */ 997 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 998 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 999 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1000 return EINVAL; 1001 1002 /* check privileged socket */ 1003 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1004 return EACCES; 1005 1006 /* allocation new SP entry */ 1007 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1008 return error; 1009 1010 newsp->state = IPSEC_SPSTATE_ALIVE; 1011 1012 /* clear old SP and set new SP */ 1013 KEY_FREESP(pcb_sp); 1014 *pcb_sp = newsp; 1015 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1016 printf("%s: new policy\n", __func__); 1017 kdebug_secpolicy(newsp)); 1018 1019 return 0; 1020} 1021 1022static int 1023ipsec_get_policy(pcb_sp, mp) 1024 struct secpolicy *pcb_sp; 1025 struct mbuf **mp; 1026{ 1027 1028 /* sanity check. */ 1029 if (pcb_sp == NULL || mp == NULL) 1030 return EINVAL; 1031 1032 *mp = key_sp2msg(pcb_sp); 1033 if (!*mp) { 1034 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1035 return ENOBUFS; 1036 } 1037 1038 (*mp)->m_type = MT_DATA; 1039 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1040 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1041 1042 return 0; 1043} 1044 1045int 1046ipsec4_set_policy(inp, optname, request, len, priv) 1047 struct inpcb *inp; 1048 int optname; 1049 caddr_t request; 1050 size_t len; 1051 int priv; 1052{ 1053 struct sadb_x_policy *xpl; 1054 struct secpolicy **pcb_sp; 1055 1056 /* sanity check. */ 1057 if (inp == NULL || request == NULL) 1058 return EINVAL; 1059 if (len < sizeof(*xpl)) 1060 return EINVAL; 1061 xpl = (struct sadb_x_policy *)request; 1062 1063 /* select direction */ 1064 switch (xpl->sadb_x_policy_dir) { 1065 case IPSEC_DIR_INBOUND: 1066 pcb_sp = &inp->inp_sp->sp_in; 1067 break; 1068 case IPSEC_DIR_OUTBOUND: 1069 pcb_sp = &inp->inp_sp->sp_out; 1070 break; 1071 default: 1072 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1073 xpl->sadb_x_policy_dir)); 1074 return EINVAL; 1075 } 1076 1077 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1078} 1079 1080int 1081ipsec4_get_policy(inp, request, len, mp) 1082 struct inpcb *inp; 1083 caddr_t request; 1084 size_t len; 1085 struct mbuf **mp; 1086{ 1087 struct sadb_x_policy *xpl; 1088 struct secpolicy *pcb_sp; 1089 1090 /* sanity check. */ 1091 if (inp == NULL || request == NULL || mp == NULL) 1092 return EINVAL; 1093 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1094 if (len < sizeof(*xpl)) 1095 return EINVAL; 1096 xpl = (struct sadb_x_policy *)request; 1097 1098 /* select direction */ 1099 switch (xpl->sadb_x_policy_dir) { 1100 case IPSEC_DIR_INBOUND: 1101 pcb_sp = inp->inp_sp->sp_in; 1102 break; 1103 case IPSEC_DIR_OUTBOUND: 1104 pcb_sp = inp->inp_sp->sp_out; 1105 break; 1106 default: 1107 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1108 xpl->sadb_x_policy_dir)); 1109 return EINVAL; 1110 } 1111 1112 return ipsec_get_policy(pcb_sp, mp); 1113} 1114 1115/* delete policy in PCB */ 1116int 1117ipsec4_delete_pcbpolicy(inp) 1118 struct inpcb *inp; 1119{ 1120 IPSEC_ASSERT(inp != NULL, ("null inp")); 1121 1122 if (inp->inp_sp == NULL) 1123 return 0; 1124 1125 if (inp->inp_sp->sp_in != NULL) 1126 KEY_FREESP(&inp->inp_sp->sp_in); 1127 1128 if (inp->inp_sp->sp_out != NULL) 1129 KEY_FREESP(&inp->inp_sp->sp_out); 1130 1131 ipsec_delpcbpolicy(inp->inp_sp); 1132 inp->inp_sp = NULL; 1133 1134 return 0; 1135} 1136 1137#ifdef INET6 1138int 1139ipsec6_set_policy(in6p, optname, request, len, priv) 1140 struct in6pcb *in6p; 1141 int optname; 1142 caddr_t request; 1143 size_t len; 1144 int priv; 1145{ 1146 struct sadb_x_policy *xpl; 1147 struct secpolicy **pcb_sp; 1148 1149 /* sanity check. */ 1150 if (in6p == NULL || request == NULL) 1151 return EINVAL; 1152 if (len < sizeof(*xpl)) 1153 return EINVAL; 1154 xpl = (struct sadb_x_policy *)request; 1155 1156 /* select direction */ 1157 switch (xpl->sadb_x_policy_dir) { 1158 case IPSEC_DIR_INBOUND: 1159 pcb_sp = &in6p->in6p_sp->sp_in; 1160 break; 1161 case IPSEC_DIR_OUTBOUND: 1162 pcb_sp = &in6p->in6p_sp->sp_out; 1163 break; 1164 default: 1165 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1166 xpl->sadb_x_policy_dir)); 1167 return EINVAL; 1168 } 1169 1170 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1171} 1172 1173int 1174ipsec6_get_policy(in6p, request, len, mp) 1175 struct in6pcb *in6p; 1176 caddr_t request; 1177 size_t len; 1178 struct mbuf **mp; 1179{ 1180 struct sadb_x_policy *xpl; 1181 struct secpolicy *pcb_sp; 1182 1183 /* sanity check. */ 1184 if (in6p == NULL || request == NULL || mp == NULL) 1185 return EINVAL; 1186 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1187 if (len < sizeof(*xpl)) 1188 return EINVAL; 1189 xpl = (struct sadb_x_policy *)request; 1190 1191 /* select direction */ 1192 switch (xpl->sadb_x_policy_dir) { 1193 case IPSEC_DIR_INBOUND: 1194 pcb_sp = in6p->in6p_sp->sp_in; 1195 break; 1196 case IPSEC_DIR_OUTBOUND: 1197 pcb_sp = in6p->in6p_sp->sp_out; 1198 break; 1199 default: 1200 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1201 xpl->sadb_x_policy_dir)); 1202 return EINVAL; 1203 } 1204 1205 return ipsec_get_policy(pcb_sp, mp); 1206} 1207 1208int 1209ipsec6_delete_pcbpolicy(in6p) 1210 struct in6pcb *in6p; 1211{ 1212 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1213 1214 if (in6p->in6p_sp == NULL) 1215 return 0; 1216 1217 if (in6p->in6p_sp->sp_in != NULL) 1218 KEY_FREESP(&in6p->in6p_sp->sp_in); 1219 1220 if (in6p->in6p_sp->sp_out != NULL) 1221 KEY_FREESP(&in6p->in6p_sp->sp_out); 1222 1223 ipsec_delpcbpolicy(in6p->in6p_sp); 1224 in6p->in6p_sp = NULL; 1225 1226 return 0; 1227} 1228#endif 1229 1230/* 1231 * return current level. 1232 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1233 */ 1234u_int 1235ipsec_get_reqlevel(isr) 1236 struct ipsecrequest *isr; 1237{ 1238 u_int level = 0; 1239 u_int esp_trans_deflev, esp_net_deflev; 1240 u_int ah_trans_deflev, ah_net_deflev; 1241 1242 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1243 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1244 ("af family mismatch, src %u, dst %u", 1245 isr->sp->spidx.src.sa.sa_family, 1246 isr->sp->spidx.dst.sa.sa_family)); 1247 1248/* XXX note that we have ipseclog() expanded here - code sync issue */ 1249#define IPSEC_CHECK_DEFAULT(lev) \ 1250 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1251 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1252 ? (ipsec_debug \ 1253 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1254 (lev), IPSEC_LEVEL_REQUIRE) \ 1255 : 0), \ 1256 (lev) = IPSEC_LEVEL_REQUIRE, \ 1257 (lev) \ 1258 : (lev)) 1259 1260 /* set default level */ 1261 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1262#ifdef INET 1263 case AF_INET: 1264 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1265 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1266 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1267 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1268 break; 1269#endif 1270#ifdef INET6 1271 case AF_INET6: 1272 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1273 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1274 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1275 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1276 break; 1277#endif /* INET6 */ 1278 default: 1279 panic("%s: unknown af %u", 1280 __func__, isr->sp->spidx.src.sa.sa_family); 1281 } 1282 1283#undef IPSEC_CHECK_DEFAULT 1284 1285 /* set level */ 1286 switch (isr->level) { 1287 case IPSEC_LEVEL_DEFAULT: 1288 switch (isr->saidx.proto) { 1289 case IPPROTO_ESP: 1290 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1291 level = esp_net_deflev; 1292 else 1293 level = esp_trans_deflev; 1294 break; 1295 case IPPROTO_AH: 1296 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1297 level = ah_net_deflev; 1298 else 1299 level = ah_trans_deflev; 1300 break; 1301 case IPPROTO_IPCOMP: 1302 /* 1303 * we don't really care, as IPcomp document says that 1304 * we shouldn't compress small packets 1305 */ 1306 level = IPSEC_LEVEL_USE; 1307 break; 1308 default: 1309 panic("%s: Illegal protocol defined %u\n", __func__, 1310 isr->saidx.proto); 1311 } 1312 break; 1313 1314 case IPSEC_LEVEL_USE: 1315 case IPSEC_LEVEL_REQUIRE: 1316 level = isr->level; 1317 break; 1318 case IPSEC_LEVEL_UNIQUE: 1319 level = IPSEC_LEVEL_REQUIRE; 1320 break; 1321 1322 default: 1323 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1324 } 1325 1326 return level; 1327} 1328 1329/* 1330 * Check security policy requirements against the actual 1331 * packet contents. Return one if the packet should be 1332 * reject as "invalid"; otherwiser return zero to have the 1333 * packet treated as "valid". 1334 * 1335 * OUT: 1336 * 0: valid 1337 * 1: invalid 1338 */ 1339int 1340ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1341{ 1342 struct ipsecrequest *isr; 1343 int need_auth; 1344 1345 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1346 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1347 1348 /* check policy */ 1349 switch (sp->policy) { 1350 case IPSEC_POLICY_DISCARD: 1351 return 1; 1352 case IPSEC_POLICY_BYPASS: 1353 case IPSEC_POLICY_NONE: 1354 return 0; 1355 } 1356 1357 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1358 ("invalid policy %u", sp->policy)); 1359 1360 /* XXX should compare policy against ipsec header history */ 1361 1362 need_auth = 0; 1363 for (isr = sp->req; isr != NULL; isr = isr->next) { 1364 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1365 continue; 1366 switch (isr->saidx.proto) { 1367 case IPPROTO_ESP: 1368 if ((m->m_flags & M_DECRYPTED) == 0) { 1369 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1370 printf("%s: ESP m_flags:%x\n", __func__, 1371 m->m_flags)); 1372 return 1; 1373 } 1374 1375 if (!need_auth && 1376 isr->sav != NULL && 1377 isr->sav->tdb_authalgxform != NULL && 1378 (m->m_flags & M_AUTHIPDGM) == 0) { 1379 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1380 printf("%s: ESP/AH m_flags:%x\n", __func__, 1381 m->m_flags)); 1382 return 1; 1383 } 1384 break; 1385 case IPPROTO_AH: 1386 need_auth = 1; 1387 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1388 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1389 printf("%s: AH m_flags:%x\n", __func__, 1390 m->m_flags)); 1391 return 1; 1392 } 1393 break; 1394 case IPPROTO_IPCOMP: 1395 /* 1396 * we don't really care, as IPcomp document 1397 * says that we shouldn't compress small 1398 * packets, IPComp policy should always be 1399 * treated as being in "use" level. 1400 */ 1401 break; 1402 } 1403 } 1404 return 0; /* valid */ 1405} 1406 1407/* 1408 * Check AH/ESP integrity. 1409 * This function is called from tcp_input(), udp_input(), 1410 * and {ah,esp}4_input for tunnel mode 1411 */ 1412int 1413ipsec4_in_reject(m, inp) 1414 struct mbuf *m; 1415 struct inpcb *inp; 1416{ 1417 struct secpolicy *sp; 1418 int error; 1419 int result; 1420 1421 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1422 1423 /* get SP for this packet. 1424 * When we are called from ip_forward(), we call 1425 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1426 */ 1427 if (inp == NULL) 1428 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1429 else 1430 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1431 1432 if (sp != NULL) { 1433 result = ipsec_in_reject(sp, m); 1434 if (result) 1435 newipsecstat.ips_in_polvio++; 1436 KEY_FREESP(&sp); 1437 } else { 1438 result = 0; /* XXX should be panic ? 1439 * -> No, there may be error. */ 1440 } 1441 return result; 1442} 1443 1444#ifdef INET6 1445/* 1446 * Check AH/ESP integrity. 1447 * This function is called from tcp6_input(), udp6_input(), 1448 * and {ah,esp}6_input for tunnel mode 1449 */ 1450int 1451ipsec6_in_reject(m, inp) 1452 struct mbuf *m; 1453 struct inpcb *inp; 1454{ 1455 struct secpolicy *sp = NULL; 1456 int error; 1457 int result; 1458 1459 /* sanity check */ 1460 if (m == NULL) 1461 return 0; /* XXX should be panic ? */ 1462 1463 /* get SP for this packet. 1464 * When we are called from ip_forward(), we call 1465 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1466 */ 1467 if (inp == NULL) 1468 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1469 else 1470 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1471 1472 if (sp != NULL) { 1473 result = ipsec_in_reject(sp, m); 1474 if (result) 1475 newipsecstat.ips_in_polvio++; 1476 KEY_FREESP(&sp); 1477 } else { 1478 result = 0; 1479 } 1480 return result; 1481} 1482#endif 1483 1484/* 1485 * compute the byte size to be occupied by IPsec header. 1486 * in case it is tunneled, it includes the size of outer IP header. 1487 * NOTE: SP passed is free in this function. 1488 */ 1489static size_t 1490ipsec_hdrsiz(struct secpolicy *sp) 1491{ 1492 struct ipsecrequest *isr; 1493 size_t siz; 1494 1495 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1496 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1497 1498 switch (sp->policy) { 1499 case IPSEC_POLICY_DISCARD: 1500 case IPSEC_POLICY_BYPASS: 1501 case IPSEC_POLICY_NONE: 1502 return 0; 1503 } 1504 1505 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1506 ("invalid policy %u", sp->policy)); 1507 1508 siz = 0; 1509 for (isr = sp->req; isr != NULL; isr = isr->next) { 1510 size_t clen = 0; 1511 1512 switch (isr->saidx.proto) { 1513 case IPPROTO_ESP: 1514 clen = esp_hdrsiz(isr->sav); 1515 break; 1516 case IPPROTO_AH: 1517 clen = ah_hdrsiz(isr->sav); 1518 break; 1519 case IPPROTO_IPCOMP: 1520 clen = sizeof(struct ipcomp); 1521 break; 1522 } 1523 1524 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1525 switch (isr->saidx.dst.sa.sa_family) { 1526 case AF_INET: 1527 clen += sizeof(struct ip); 1528 break; 1529#ifdef INET6 1530 case AF_INET6: 1531 clen += sizeof(struct ip6_hdr); 1532 break; 1533#endif 1534 default: 1535 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1536 "IPsec tunnel SA\n", __func__, 1537 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1538 break; 1539 } 1540 } 1541 siz += clen; 1542 } 1543 1544 return siz; 1545} 1546 1547/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1548size_t 1549ipsec4_hdrsiz(m, dir, inp) 1550 struct mbuf *m; 1551 u_int dir; 1552 struct inpcb *inp; 1553{ 1554 struct secpolicy *sp; 1555 int error; 1556 size_t size; 1557 1558 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1559 1560 /* get SP for this packet. 1561 * When we are called from ip_forward(), we call 1562 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1563 */ 1564 if (inp == NULL) 1565 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1566 else 1567 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1568 1569 if (sp != NULL) { 1570 size = ipsec_hdrsiz(sp); 1571 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1572 printf("%s: size:%lu.\n", __func__, 1573 (unsigned long)size)); 1574 1575 KEY_FREESP(&sp); 1576 } else { 1577 size = 0; /* XXX should be panic ? */ 1578 } 1579 return size; 1580} 1581 1582#ifdef INET6 1583/* This function is called from ipsec6_hdrsize_tcp(), 1584 * and maybe from ip6_forward.() 1585 */ 1586size_t 1587ipsec6_hdrsiz(m, dir, in6p) 1588 struct mbuf *m; 1589 u_int dir; 1590 struct in6pcb *in6p; 1591{ 1592 struct secpolicy *sp; 1593 int error; 1594 size_t size; 1595 1596 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1597 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1598 ("socket w/o inpcb")); 1599 1600 /* get SP for this packet */ 1601 /* XXX Is it right to call with IP_FORWARDING. */ 1602 if (in6p == NULL) 1603 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1604 else 1605 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1606 1607 if (sp == NULL) 1608 return 0; 1609 size = ipsec_hdrsiz(sp); 1610 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1611 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1612 KEY_FREESP(&sp); 1613 1614 return size; 1615} 1616#endif /*INET6*/ 1617 1618/* 1619 * Check the variable replay window. 1620 * ipsec_chkreplay() performs replay check before ICV verification. 1621 * ipsec_updatereplay() updates replay bitmap. This must be called after 1622 * ICV verification (it also performs replay check, which is usually done 1623 * beforehand). 1624 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1625 * 1626 * based on RFC 2401. 1627 */ 1628int 1629ipsec_chkreplay(seq, sav) 1630 u_int32_t seq; 1631 struct secasvar *sav; 1632{ 1633 const struct secreplay *replay; 1634 u_int32_t diff; 1635 int fr; 1636 u_int32_t wsizeb; /* constant: bits of window size */ 1637 int frlast; /* constant: last frame */ 1638 1639 IPSEC_SPLASSERT_SOFTNET(__func__); 1640 1641 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1642 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1643 1644 replay = sav->replay; 1645 1646 if (replay->wsize == 0) 1647 return 1; /* no need to check replay. */ 1648 1649 /* constant */ 1650 frlast = replay->wsize - 1; 1651 wsizeb = replay->wsize << 3; 1652 1653 /* sequence number of 0 is invalid */ 1654 if (seq == 0) 1655 return 0; 1656 1657 /* first time is always okay */ 1658 if (replay->count == 0) 1659 return 1; 1660 1661 if (seq > replay->lastseq) { 1662 /* larger sequences are okay */ 1663 return 1; 1664 } else { 1665 /* seq is equal or less than lastseq. */ 1666 diff = replay->lastseq - seq; 1667 1668 /* over range to check, i.e. too old or wrapped */ 1669 if (diff >= wsizeb) 1670 return 0; 1671 1672 fr = frlast - diff / 8; 1673 1674 /* this packet already seen ? */ 1675 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1676 return 0; 1677 1678 /* out of order but good */ 1679 return 1; 1680 } 1681} 1682 1683/* 1684 * check replay counter whether to update or not. 1685 * OUT: 0: OK 1686 * 1: NG 1687 */ 1688int 1689ipsec_updatereplay(seq, sav) 1690 u_int32_t seq; 1691 struct secasvar *sav; 1692{ 1693 struct secreplay *replay; 1694 u_int32_t diff; 1695 int fr; 1696 u_int32_t wsizeb; /* constant: bits of window size */ 1697 int frlast; /* constant: last frame */ 1698 1699 IPSEC_SPLASSERT_SOFTNET(__func__); 1700 1701 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1702 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1703 1704 replay = sav->replay; 1705 1706 if (replay->wsize == 0) 1707 goto ok; /* no need to check replay. */ 1708 1709 /* constant */ 1710 frlast = replay->wsize - 1; 1711 wsizeb = replay->wsize << 3; 1712 1713 /* sequence number of 0 is invalid */ 1714 if (seq == 0) 1715 return 1; 1716 1717 /* first time */ 1718 if (replay->count == 0) { 1719 replay->lastseq = seq; 1720 bzero(replay->bitmap, replay->wsize); 1721 (replay->bitmap)[frlast] = 1; 1722 goto ok; 1723 } 1724 1725 if (seq > replay->lastseq) { 1726 /* seq is larger than lastseq. */ 1727 diff = seq - replay->lastseq; 1728 1729 /* new larger sequence number */ 1730 if (diff < wsizeb) { 1731 /* In window */ 1732 /* set bit for this packet */ 1733 vshiftl(replay->bitmap, diff, replay->wsize); 1734 (replay->bitmap)[frlast] |= 1; 1735 } else { 1736 /* this packet has a "way larger" */ 1737 bzero(replay->bitmap, replay->wsize); 1738 (replay->bitmap)[frlast] = 1; 1739 } 1740 replay->lastseq = seq; 1741 1742 /* larger is good */ 1743 } else { 1744 /* seq is equal or less than lastseq. */ 1745 diff = replay->lastseq - seq; 1746 1747 /* over range to check, i.e. too old or wrapped */ 1748 if (diff >= wsizeb) 1749 return 1; 1750 1751 fr = frlast - diff / 8; 1752 1753 /* this packet already seen ? */ 1754 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1755 return 1; 1756 1757 /* mark as seen */ 1758 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1759 1760 /* out of order but good */ 1761 } 1762 1763ok: 1764 if (replay->count == ~0) { 1765 1766 /* set overflow flag */ 1767 replay->overflow++; 1768 1769 /* don't increment, no more packets accepted */ 1770 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1771 return 1; 1772 1773 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1774 __func__, replay->overflow, ipsec_logsastr(sav))); 1775 } 1776 1777 replay->count++; 1778 1779 return 0; 1780} 1781 1782/* 1783 * shift variable length bunffer to left. 1784 * IN: bitmap: pointer to the buffer 1785 * nbit: the number of to shift. 1786 * wsize: buffer size (bytes). 1787 */ 1788static void 1789vshiftl(bitmap, nbit, wsize) 1790 unsigned char *bitmap; 1791 int nbit, wsize; 1792{ 1793 int s, j, i; 1794 unsigned char over; 1795 1796 for (j = 0; j < nbit; j += 8) { 1797 s = (nbit - j < 8) ? (nbit - j): 8; 1798 bitmap[0] <<= s; 1799 for (i = 1; i < wsize; i++) { 1800 over = (bitmap[i] >> (8 - s)); 1801 bitmap[i] <<= s; 1802 bitmap[i-1] |= over; 1803 } 1804 } 1805 1806 return; 1807} 1808 1809/* Return a printable string for the IPv4 address. */ 1810static char * 1811inet_ntoa4(struct in_addr ina) 1812{ 1813 static char buf[4][4 * sizeof "123" + 4]; 1814 unsigned char *ucp = (unsigned char *) &ina; 1815 static int i = 3; 1816 1817 i = (i + 1) % 4; 1818 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1819 ucp[2] & 0xff, ucp[3] & 0xff); 1820 return (buf[i]); 1821} 1822 1823/* Return a printable string for the address. */ 1824char * 1825ipsec_address(union sockaddr_union* sa) 1826{ 1827 switch (sa->sa.sa_family) { 1828#if INET 1829 case AF_INET: 1830 return inet_ntoa4(sa->sin.sin_addr); 1831#endif /* INET */ 1832 1833#if INET6 1834 case AF_INET6: 1835 return ip6_sprintf(&sa->sin6.sin6_addr); 1836#endif /* INET6 */ 1837 1838 default: 1839 return "(unknown address family)"; 1840 } 1841} 1842 1843const char * 1844ipsec_logsastr(sav) 1845 struct secasvar *sav; 1846{ 1847 static char buf[256]; 1848 char *p; 1849 struct secasindex *saidx = &sav->sah->saidx; 1850 1851 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1852 ("address family mismatch")); 1853 1854 p = buf; 1855 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1856 while (p && *p) 1857 p++; 1858 /* NB: only use ipsec_address on one address at a time */ 1859 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1860 ipsec_address(&saidx->src)); 1861 while (p && *p) 1862 p++; 1863 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1864 ipsec_address(&saidx->dst)); 1865 1866 return buf; 1867} 1868 1869void 1870ipsec_dumpmbuf(m) 1871 struct mbuf *m; 1872{ 1873 int totlen; 1874 int i; 1875 u_char *p; 1876 1877 totlen = 0; 1878 printf("---\n"); 1879 while (m) { 1880 p = mtod(m, u_char *); 1881 for (i = 0; i < m->m_len; i++) { 1882 printf("%02x ", p[i]); 1883 totlen++; 1884 if (totlen % 16 == 0) 1885 printf("\n"); 1886 } 1887 m = m->m_next; 1888 } 1889 if (totlen % 16 != 0) 1890 printf("\n"); 1891 printf("---\n"); 1892} 1893 1894static void 1895ipsec_attach(void) 1896{ 1897 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1898 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1899} 1900SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL) 1901 1902 1903/* XXX this stuff doesn't belong here... */ 1904 1905static struct xformsw* xforms = NULL; 1906 1907/* 1908 * Register a transform; typically at system startup. 1909 */ 1910void 1911xform_register(struct xformsw* xsp) 1912{ 1913 xsp->xf_next = xforms; 1914 xforms = xsp; 1915} 1916 1917/* 1918 * Initialize transform support in an sav. 1919 */ 1920int 1921xform_init(struct secasvar *sav, int xftype) 1922{ 1923 struct xformsw *xsp; 1924 1925 if (sav->tdb_xform != NULL) /* previously initialized */ 1926 return 0; 1927 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1928 if (xsp->xf_type == xftype) 1929 return (*xsp->xf_init)(sav, xsp); 1930 return EINVAL; 1931} 1932