ipsec.c revision 157123
1/* $FreeBSD: head/sys/netipsec/ipsec.c 157123 2006-03-25 13:38:52Z gnn $ */ 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#define IPSEC_DEBUG 96#ifdef IPSEC_DEBUG 97int ipsec_debug = 1; 98#else 99int ipsec_debug = 0; 100#endif 101 102/* NB: name changed so netstat doesn't use it */ 103struct newipsecstat newipsecstat; 104int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 105int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 106int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 107int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 108int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 109int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 110struct secpolicy ip4_def_policy; 111int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 112int ip4_esp_randpad = -1; 113/* 114 * Crypto support requirements: 115 * 116 * 1 require hardware support 117 * -1 require software support 118 * 0 take anything 119 */ 120int crypto_support = 0; 121 122SYSCTL_DECL(_net_inet_ipsec); 123 124/* net.inet.ipsec */ 125SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 126 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 127SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 128 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 129SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 130 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 131SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 132 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 133SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 134 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 135SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 136 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 137SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 138 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 139SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 140 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 141SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 142 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 143SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 144 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 145SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 146 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 147SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 148 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 149SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 150 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 151 152#ifdef INET6 153int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 154int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 155int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 156int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 157int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 158int ip6_esp_randpad = -1; 159 160SYSCTL_DECL(_net_inet6_ipsec6); 161 162/* net.inet6.ipsec6 */ 163#ifdef COMPAT_KAME 164SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 165 0,0, compat_ipsecstats_sysctl, "S", ""); 166#endif /* COMPAT_KAME */ 167SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 168 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 169SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 170 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 171SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 172 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 173SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 174 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 175SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 176 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 177SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 178 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 179SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 180 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 181SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 182 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 183#endif /* INET6 */ 184 185static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 186#ifdef INET6 187static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 188#endif 189static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 190static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 191static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 192#ifdef INET6 193static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 194static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 195#endif 196static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 197static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 198static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 199 int optname, caddr_t request, size_t len, int priv)); 200static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 201static void vshiftl __P((unsigned char *, int, int)); 202static size_t ipsec_hdrsiz __P((struct secpolicy *)); 203 204MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 205 206/* 207 * Return a held reference to the default SP. 208 */ 209static struct secpolicy * 210key_allocsp_default(const char* where, int tag) 211{ 212 struct secpolicy *sp; 213 214 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 215 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 216 217 sp = &ip4_def_policy; 218 if (sp->policy != IPSEC_POLICY_DISCARD && 219 sp->policy != IPSEC_POLICY_NONE) { 220 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 221 sp->policy, IPSEC_POLICY_NONE)); 222 sp->policy = IPSEC_POLICY_NONE; 223 } 224 key_addref(sp); 225 226 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 227 printf("DP key_allocsp_default returns SP:%p (%u)\n", 228 sp, sp->refcnt)); 229 return sp; 230} 231#define KEY_ALLOCSP_DEFAULT() \ 232 key_allocsp_default(__FILE__, __LINE__) 233 234/* 235 * For OUTBOUND packet having a socket. Searching SPD for packet, 236 * and return a pointer to SP. 237 * OUT: NULL: no apropreate SP found, the following value is set to error. 238 * 0 : bypass 239 * EACCES : discard packet. 240 * ENOENT : ipsec_acquire() in progress, maybe. 241 * others : error occured. 242 * others: a pointer to SP 243 * 244 * NOTE: IPv6 mapped adddress concern is implemented here. 245 */ 246struct secpolicy * 247ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 248{ 249 struct secpolicy *sp; 250 251 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 252 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 253 ("invalid direction %u", dir)); 254 255 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 256 if (sp == NULL) /*XXX????*/ 257 sp = KEY_ALLOCSP_DEFAULT(); 258 IPSEC_ASSERT(sp != NULL, ("null SP")); 259 return sp; 260} 261 262/* 263 * For OUTBOUND packet having a socket. Searching SPD for packet, 264 * and return a pointer to SP. 265 * OUT: NULL: no apropreate SP found, the following value is set to error. 266 * 0 : bypass 267 * EACCES : discard packet. 268 * ENOENT : ipsec_acquire() in progress, maybe. 269 * others : error occured. 270 * others: a pointer to SP 271 * 272 * NOTE: IPv6 mapped adddress concern is implemented here. 273 */ 274struct secpolicy * 275ipsec_getpolicybysock(m, dir, inp, error) 276 struct mbuf *m; 277 u_int dir; 278 struct inpcb *inp; 279 int *error; 280{ 281 struct inpcbpolicy *pcbsp = NULL; 282 struct secpolicy *currsp = NULL; /* policy on socket */ 283 struct secpolicy *sp; 284 285 IPSEC_ASSERT(m != NULL, ("null mbuf")); 286 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 287 IPSEC_ASSERT(error != NULL, ("null error")); 288 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 289 ("invalid direction %u", dir)); 290 291 /* set spidx in pcb */ 292 if (inp->inp_vflag & INP_IPV6PROTO) { 293#ifdef INET6 294 *error = ipsec6_setspidx_in6pcb(m, inp); 295 pcbsp = inp->in6p_sp; 296#else 297 *error = EINVAL; /* should not happen */ 298#endif 299 } else { 300 *error = ipsec4_setspidx_inpcb(m, inp); 301 pcbsp = inp->inp_sp; 302 } 303 if (*error) 304 return NULL; 305 306 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 307 switch (dir) { 308 case IPSEC_DIR_INBOUND: 309 currsp = pcbsp->sp_in; 310 break; 311 case IPSEC_DIR_OUTBOUND: 312 currsp = pcbsp->sp_out; 313 break; 314 } 315 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 316 317 if (pcbsp->priv) { /* when privilieged socket */ 318 switch (currsp->policy) { 319 case IPSEC_POLICY_BYPASS: 320 case IPSEC_POLICY_IPSEC: 321 key_addref(currsp); 322 sp = currsp; 323 break; 324 325 case IPSEC_POLICY_ENTRUST: 326 /* look for a policy in SPD */ 327 sp = KEY_ALLOCSP(&currsp->spidx, dir); 328 if (sp == NULL) /* no SP found */ 329 sp = KEY_ALLOCSP_DEFAULT(); 330 break; 331 332 default: 333 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 334 __func__, currsp->policy)); 335 *error = EINVAL; 336 return NULL; 337 } 338 } else { /* unpriv, SPD has policy */ 339 sp = KEY_ALLOCSP(&currsp->spidx, dir); 340 if (sp == NULL) { /* no SP found */ 341 switch (currsp->policy) { 342 case IPSEC_POLICY_BYPASS: 343 ipseclog((LOG_ERR, "%s: Illegal policy for " 344 "non-priviliged defined %d\n", 345 __func__, currsp->policy)); 346 *error = EINVAL; 347 return NULL; 348 349 case IPSEC_POLICY_ENTRUST: 350 sp = KEY_ALLOCSP_DEFAULT(); 351 break; 352 353 case IPSEC_POLICY_IPSEC: 354 key_addref(currsp); 355 sp = currsp; 356 break; 357 358 default: 359 ipseclog((LOG_ERR, "%s: Invalid policy for " 360 "PCB %d\n", __func__, currsp->policy)); 361 *error = EINVAL; 362 return NULL; 363 } 364 } 365 } 366 IPSEC_ASSERT(sp != NULL, 367 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 368 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 369 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 370 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 371 return sp; 372} 373 374/* 375 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 376 * and return a pointer to SP. 377 * OUT: positive: a pointer to the entry for security policy leaf matched. 378 * NULL: no apropreate SP found, the following value is set to error. 379 * 0 : bypass 380 * EACCES : discard packet. 381 * ENOENT : ipsec_acquire() in progress, maybe. 382 * others : error occured. 383 */ 384struct secpolicy * 385ipsec_getpolicybyaddr(m, dir, flag, error) 386 struct mbuf *m; 387 u_int dir; 388 int flag; 389 int *error; 390{ 391 struct secpolicyindex spidx; 392 struct secpolicy *sp; 393 394 IPSEC_ASSERT(m != NULL, ("null mbuf")); 395 IPSEC_ASSERT(error != NULL, ("null error")); 396 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 397 ("invalid direction %u", dir)); 398 399 sp = NULL; 400 if (key_havesp(dir)) { 401 /* Make an index to look for a policy. */ 402 *error = ipsec_setspidx(m, &spidx, 403 (flag & IP_FORWARDING) ? 0 : 1); 404 if (*error != 0) { 405 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 406 __func__, dir, flag)); 407 return NULL; 408 } 409 spidx.dir = dir; 410 411 sp = KEY_ALLOCSP(&spidx, dir); 412 } 413 if (sp == NULL) /* no SP found, use system default */ 414 sp = KEY_ALLOCSP_DEFAULT(); 415 IPSEC_ASSERT(sp != NULL, ("null SP")); 416 return sp; 417} 418 419struct secpolicy * 420ipsec4_checkpolicy(m, dir, flag, error, inp) 421 struct mbuf *m; 422 u_int dir, flag; 423 int *error; 424 struct inpcb *inp; 425{ 426 struct secpolicy *sp; 427 428 *error = 0; 429 if (inp == NULL) 430 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 431 else 432 sp = ipsec_getpolicybysock(m, dir, inp, error); 433 if (sp == NULL) { 434 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 435 newipsecstat.ips_out_inval++; 436 return NULL; 437 } 438 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 439 switch (sp->policy) { 440 case IPSEC_POLICY_ENTRUST: 441 default: 442 printf("%s: invalid policy %u\n", __func__, sp->policy); 443 /* fall thru... */ 444 case IPSEC_POLICY_DISCARD: 445 newipsecstat.ips_out_polvio++; 446 *error = -EINVAL; /* packet is discarded by caller */ 447 break; 448 case IPSEC_POLICY_BYPASS: 449 case IPSEC_POLICY_NONE: 450 KEY_FREESP(&sp); 451 sp = NULL; /* NB: force NULL result */ 452 break; 453 case IPSEC_POLICY_IPSEC: 454 if (sp->req == NULL) /* acquire an SA */ 455 *error = key_spdacquire(sp); 456 break; 457 } 458 if (*error != 0) { 459 KEY_FREESP(&sp); 460 sp = NULL; 461 } 462 return sp; 463} 464 465static int 466ipsec4_setspidx_inpcb(m, pcb) 467 struct mbuf *m; 468 struct inpcb *pcb; 469{ 470 int error; 471 472 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 473 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 474 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 475 ("null sp_in || sp_out")); 476 477 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 478 if (error == 0) { 479 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 480 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 481 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 482 } else { 483 bzero(&pcb->inp_sp->sp_in->spidx, 484 sizeof (pcb->inp_sp->sp_in->spidx)); 485 bzero(&pcb->inp_sp->sp_out->spidx, 486 sizeof (pcb->inp_sp->sp_in->spidx)); 487 } 488 return error; 489} 490 491#ifdef INET6 492static int 493ipsec6_setspidx_in6pcb(m, pcb) 494 struct mbuf *m; 495 struct in6pcb *pcb; 496{ 497 struct secpolicyindex *spidx; 498 int error; 499 500 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 501 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 502 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 503 ("null sp_in || sp_out")); 504 505 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 506 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 507 508 spidx = &pcb->in6p_sp->sp_in->spidx; 509 error = ipsec_setspidx(m, spidx, 1); 510 if (error) 511 goto bad; 512 spidx->dir = IPSEC_DIR_INBOUND; 513 514 spidx = &pcb->in6p_sp->sp_out->spidx; 515 error = ipsec_setspidx(m, spidx, 1); 516 if (error) 517 goto bad; 518 spidx->dir = IPSEC_DIR_OUTBOUND; 519 520 return 0; 521 522bad: 523 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 524 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 525 return error; 526} 527#endif 528 529/* 530 * configure security policy index (src/dst/proto/sport/dport) 531 * by looking at the content of mbuf. 532 * the caller is responsible for error recovery (like clearing up spidx). 533 */ 534static int 535ipsec_setspidx(m, spidx, needport) 536 struct mbuf *m; 537 struct secpolicyindex *spidx; 538 int needport; 539{ 540 struct ip *ip = NULL; 541 struct ip ipbuf; 542 u_int v; 543 struct mbuf *n; 544 int len; 545 int error; 546 547 IPSEC_ASSERT(m != NULL, ("null mbuf")); 548 549 /* 550 * validate m->m_pkthdr.len. we see incorrect length if we 551 * mistakenly call this function with inconsistent mbuf chain 552 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 553 */ 554 len = 0; 555 for (n = m; n; n = n->m_next) 556 len += n->m_len; 557 if (m->m_pkthdr.len != len) { 558 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 559 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 560 __func__, len, m->m_pkthdr.len)); 561 return EINVAL; 562 } 563 564 if (m->m_pkthdr.len < sizeof(struct ip)) { 565 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 566 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 567 __func__, m->m_pkthdr.len)); 568 return EINVAL; 569 } 570 571 if (m->m_len >= sizeof(*ip)) 572 ip = mtod(m, struct ip *); 573 else { 574 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 575 ip = &ipbuf; 576 } 577#ifdef _IP_VHL 578 v = _IP_VHL_V(ip->ip_vhl); 579#else 580 v = ip->ip_v; 581#endif 582 switch (v) { 583 case 4: 584 error = ipsec4_setspidx_ipaddr(m, spidx); 585 if (error) 586 return error; 587 ipsec4_get_ulp(m, spidx, needport); 588 return 0; 589#ifdef INET6 590 case 6: 591 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 592 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 593 printf("%s: pkthdr len(%d) too small (v6), " 594 "ignored\n", __func__, m->m_pkthdr.len)); 595 return EINVAL; 596 } 597 error = ipsec6_setspidx_ipaddr(m, spidx); 598 if (error) 599 return error; 600 ipsec6_get_ulp(m, spidx, needport); 601 return 0; 602#endif 603 default: 604 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 605 printf("%s: " "unknown IP version %u, ignored.\n", 606 __func__, v)); 607 return EINVAL; 608 } 609} 610 611static void 612ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 613{ 614 u_int8_t nxt; 615 int off; 616 617 /* sanity check */ 618 IPSEC_ASSERT(m != NULL, ("null mbuf")); 619 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 620 621 /* NB: ip_input() flips it into host endian XXX need more checking */ 622 if (m->m_len < sizeof (struct ip)) { 623 struct ip *ip = mtod(m, struct ip *); 624 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 625 goto done; 626#ifdef _IP_VHL 627 off = _IP_VHL_HL(ip->ip_vhl) << 2; 628#else 629 off = ip->ip_hl << 2; 630#endif 631 nxt = ip->ip_p; 632 } else { 633 struct ip ih; 634 635 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 636 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 637 goto done; 638#ifdef _IP_VHL 639 off = _IP_VHL_HL(ih.ip_vhl) << 2; 640#else 641 off = ih.ip_hl << 2; 642#endif 643 nxt = ih.ip_p; 644 } 645 646 while (off < m->m_pkthdr.len) { 647 struct ip6_ext ip6e; 648 struct tcphdr th; 649 struct udphdr uh; 650 651 switch (nxt) { 652 case IPPROTO_TCP: 653 spidx->ul_proto = nxt; 654 if (!needport) 655 goto done_proto; 656 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 657 goto done; 658 m_copydata(m, off, sizeof (th), (caddr_t) &th); 659 spidx->src.sin.sin_port = th.th_sport; 660 spidx->dst.sin.sin_port = th.th_dport; 661 return; 662 case IPPROTO_UDP: 663 spidx->ul_proto = nxt; 664 if (!needport) 665 goto done_proto; 666 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 667 goto done; 668 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 669 spidx->src.sin.sin_port = uh.uh_sport; 670 spidx->dst.sin.sin_port = uh.uh_dport; 671 return; 672 case IPPROTO_AH: 673 if (off + sizeof(ip6e) > m->m_pkthdr.len) 674 goto done; 675 /* XXX sigh, this works but is totally bogus */ 676 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 677 off += (ip6e.ip6e_len + 2) << 2; 678 nxt = ip6e.ip6e_nxt; 679 break; 680 case IPPROTO_ICMP: 681 default: 682 /* XXX intermediate headers??? */ 683 spidx->ul_proto = nxt; 684 goto done_proto; 685 } 686 } 687done: 688 spidx->ul_proto = IPSEC_ULPROTO_ANY; 689done_proto: 690 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 691 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 692} 693 694/* assumes that m is sane */ 695static int 696ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 697{ 698 static const struct sockaddr_in template = { 699 sizeof (struct sockaddr_in), 700 AF_INET, 701 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 702 }; 703 704 spidx->src.sin = template; 705 spidx->dst.sin = template; 706 707 if (m->m_len < sizeof (struct ip)) { 708 m_copydata(m, offsetof(struct ip, ip_src), 709 sizeof (struct in_addr), 710 (caddr_t) &spidx->src.sin.sin_addr); 711 m_copydata(m, offsetof(struct ip, ip_dst), 712 sizeof (struct in_addr), 713 (caddr_t) &spidx->dst.sin.sin_addr); 714 } else { 715 struct ip *ip = mtod(m, struct ip *); 716 spidx->src.sin.sin_addr = ip->ip_src; 717 spidx->dst.sin.sin_addr = ip->ip_dst; 718 } 719 720 spidx->prefs = sizeof(struct in_addr) << 3; 721 spidx->prefd = sizeof(struct in_addr) << 3; 722 723 return 0; 724} 725 726#ifdef INET6 727static void 728ipsec6_get_ulp(m, spidx, needport) 729 struct mbuf *m; 730 struct secpolicyindex *spidx; 731 int needport; 732{ 733 int off, nxt; 734 struct tcphdr th; 735 struct udphdr uh; 736 737 /* sanity check */ 738 if (m == NULL) 739 panic("%s: NULL pointer was passed.\n", __func__); 740 741 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 742 printf("%s:\n", __func__); kdebug_mbuf(m)); 743 744 /* set default */ 745 spidx->ul_proto = IPSEC_ULPROTO_ANY; 746 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 747 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 748 749 nxt = -1; 750 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 751 if (off < 0 || m->m_pkthdr.len < off) 752 return; 753 754 switch (nxt) { 755 case IPPROTO_TCP: 756 spidx->ul_proto = nxt; 757 if (!needport) 758 break; 759 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 760 break; 761 m_copydata(m, off, sizeof(th), (caddr_t)&th); 762 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 763 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 764 break; 765 case IPPROTO_UDP: 766 spidx->ul_proto = nxt; 767 if (!needport) 768 break; 769 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 770 break; 771 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 772 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 773 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 774 break; 775 case IPPROTO_ICMPV6: 776 default: 777 /* XXX intermediate headers??? */ 778 spidx->ul_proto = nxt; 779 break; 780 } 781} 782 783/* assumes that m is sane */ 784static int 785ipsec6_setspidx_ipaddr(m, spidx) 786 struct mbuf *m; 787 struct secpolicyindex *spidx; 788{ 789 struct ip6_hdr *ip6 = NULL; 790 struct ip6_hdr ip6buf; 791 struct sockaddr_in6 *sin6; 792 793 if (m->m_len >= sizeof(*ip6)) 794 ip6 = mtod(m, struct ip6_hdr *); 795 else { 796 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 797 ip6 = &ip6buf; 798 } 799 800 sin6 = (struct sockaddr_in6 *)&spidx->src; 801 bzero(sin6, sizeof(*sin6)); 802 sin6->sin6_family = AF_INET6; 803 sin6->sin6_len = sizeof(struct sockaddr_in6); 804 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 805 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 806 sin6->sin6_addr.s6_addr16[1] = 0; 807 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 808 } 809 spidx->prefs = sizeof(struct in6_addr) << 3; 810 811 sin6 = (struct sockaddr_in6 *)&spidx->dst; 812 bzero(sin6, sizeof(*sin6)); 813 sin6->sin6_family = AF_INET6; 814 sin6->sin6_len = sizeof(struct sockaddr_in6); 815 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 816 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 817 sin6->sin6_addr.s6_addr16[1] = 0; 818 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 819 } 820 spidx->prefd = sizeof(struct in6_addr) << 3; 821 822 return 0; 823} 824#endif 825 826static void 827ipsec_delpcbpolicy(p) 828 struct inpcbpolicy *p; 829{ 830 free(p, M_IPSEC_INPCB); 831} 832 833/* initialize policy in PCB */ 834int 835ipsec_init_policy(so, pcb_sp) 836 struct socket *so; 837 struct inpcbpolicy **pcb_sp; 838{ 839 struct inpcbpolicy *new; 840 841 /* sanity check. */ 842 if (so == NULL || pcb_sp == NULL) 843 panic("%s: NULL pointer was passed.\n", __func__); 844 845 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 846 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 847 if (new == NULL) { 848 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 849 return ENOBUFS; 850 } 851 852 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 853 854 if ((new->sp_in = KEY_NEWSP()) == NULL) { 855 ipsec_delpcbpolicy(new); 856 return ENOBUFS; 857 } 858 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 859 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 860 861 if ((new->sp_out = KEY_NEWSP()) == NULL) { 862 KEY_FREESP(&new->sp_in); 863 ipsec_delpcbpolicy(new); 864 return ENOBUFS; 865 } 866 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 867 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 868 869 *pcb_sp = new; 870 871 return 0; 872} 873 874/* copy old ipsec policy into new */ 875int 876ipsec_copy_policy(old, new) 877 struct inpcbpolicy *old, *new; 878{ 879 struct secpolicy *sp; 880 881 sp = ipsec_deepcopy_policy(old->sp_in); 882 if (sp) { 883 KEY_FREESP(&new->sp_in); 884 new->sp_in = sp; 885 } else 886 return ENOBUFS; 887 888 sp = ipsec_deepcopy_policy(old->sp_out); 889 if (sp) { 890 KEY_FREESP(&new->sp_out); 891 new->sp_out = sp; 892 } else 893 return ENOBUFS; 894 895 new->priv = old->priv; 896 897 return 0; 898} 899 900struct ipsecrequest * 901ipsec_newisr(void) 902{ 903 struct ipsecrequest *p; 904 905 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 906 if (p != NULL) 907 IPSECREQUEST_LOCK_INIT(p); 908 return p; 909} 910 911void 912ipsec_delisr(struct ipsecrequest *p) 913{ 914 IPSECREQUEST_LOCK_DESTROY(p); 915 free(p, M_IPSEC_SR); 916} 917 918/* deep-copy a policy in PCB */ 919static struct secpolicy * 920ipsec_deepcopy_policy(src) 921 struct secpolicy *src; 922{ 923 struct ipsecrequest *newchain = NULL; 924 struct ipsecrequest *p; 925 struct ipsecrequest **q; 926 struct ipsecrequest *r; 927 struct secpolicy *dst; 928 929 if (src == NULL) 930 return NULL; 931 dst = KEY_NEWSP(); 932 if (dst == NULL) 933 return NULL; 934 935 /* 936 * deep-copy IPsec request chain. This is required since struct 937 * ipsecrequest is not reference counted. 938 */ 939 q = &newchain; 940 for (p = src->req; p; p = p->next) { 941 *q = ipsec_newisr(); 942 if (*q == NULL) 943 goto fail; 944 (*q)->saidx.proto = p->saidx.proto; 945 (*q)->saidx.mode = p->saidx.mode; 946 (*q)->level = p->level; 947 (*q)->saidx.reqid = p->saidx.reqid; 948 949 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 950 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 951 952 (*q)->sp = dst; 953 954 q = &((*q)->next); 955 } 956 957 dst->req = newchain; 958 dst->state = src->state; 959 dst->policy = src->policy; 960 /* do not touch the refcnt fields */ 961 962 return dst; 963 964fail: 965 for (p = newchain; p; p = r) { 966 r = p->next; 967 ipsec_delisr(p); 968 p = NULL; 969 } 970 return NULL; 971} 972 973/* set policy and ipsec request if present. */ 974static int 975ipsec_set_policy(pcb_sp, optname, request, len, priv) 976 struct secpolicy **pcb_sp; 977 int optname; 978 caddr_t request; 979 size_t len; 980 int priv; 981{ 982 struct sadb_x_policy *xpl; 983 struct secpolicy *newsp = NULL; 984 int error; 985 986 /* sanity check. */ 987 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 988 return EINVAL; 989 if (len < sizeof(*xpl)) 990 return EINVAL; 991 xpl = (struct sadb_x_policy *)request; 992 993 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 994 printf("%s: passed policy\n", __func__); 995 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 996 997 /* check policy type */ 998 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 999 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1000 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1001 return EINVAL; 1002 1003 /* check privileged socket */ 1004 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1005 return EACCES; 1006 1007 /* allocation new SP entry */ 1008 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1009 return error; 1010 1011 newsp->state = IPSEC_SPSTATE_ALIVE; 1012 1013 /* clear old SP and set new SP */ 1014 KEY_FREESP(pcb_sp); 1015 *pcb_sp = newsp; 1016 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1017 printf("%s: new policy\n", __func__); 1018 kdebug_secpolicy(newsp)); 1019 1020 return 0; 1021} 1022 1023static int 1024ipsec_get_policy(pcb_sp, mp) 1025 struct secpolicy *pcb_sp; 1026 struct mbuf **mp; 1027{ 1028 1029 /* sanity check. */ 1030 if (pcb_sp == NULL || mp == NULL) 1031 return EINVAL; 1032 1033 *mp = key_sp2msg(pcb_sp); 1034 if (!*mp) { 1035 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1036 return ENOBUFS; 1037 } 1038 1039 (*mp)->m_type = MT_DATA; 1040 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1041 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1042 1043 return 0; 1044} 1045 1046int 1047ipsec4_set_policy(inp, optname, request, len, priv) 1048 struct inpcb *inp; 1049 int optname; 1050 caddr_t request; 1051 size_t len; 1052 int priv; 1053{ 1054 struct sadb_x_policy *xpl; 1055 struct secpolicy **pcb_sp; 1056 1057 /* sanity check. */ 1058 if (inp == NULL || request == NULL) 1059 return EINVAL; 1060 if (len < sizeof(*xpl)) 1061 return EINVAL; 1062 xpl = (struct sadb_x_policy *)request; 1063 1064 /* select direction */ 1065 switch (xpl->sadb_x_policy_dir) { 1066 case IPSEC_DIR_INBOUND: 1067 pcb_sp = &inp->inp_sp->sp_in; 1068 break; 1069 case IPSEC_DIR_OUTBOUND: 1070 pcb_sp = &inp->inp_sp->sp_out; 1071 break; 1072 default: 1073 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1074 xpl->sadb_x_policy_dir)); 1075 return EINVAL; 1076 } 1077 1078 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1079} 1080 1081int 1082ipsec4_get_policy(inp, request, len, mp) 1083 struct inpcb *inp; 1084 caddr_t request; 1085 size_t len; 1086 struct mbuf **mp; 1087{ 1088 struct sadb_x_policy *xpl; 1089 struct secpolicy *pcb_sp; 1090 1091 /* sanity check. */ 1092 if (inp == NULL || request == NULL || mp == NULL) 1093 return EINVAL; 1094 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1095 if (len < sizeof(*xpl)) 1096 return EINVAL; 1097 xpl = (struct sadb_x_policy *)request; 1098 1099 /* select direction */ 1100 switch (xpl->sadb_x_policy_dir) { 1101 case IPSEC_DIR_INBOUND: 1102 pcb_sp = inp->inp_sp->sp_in; 1103 break; 1104 case IPSEC_DIR_OUTBOUND: 1105 pcb_sp = inp->inp_sp->sp_out; 1106 break; 1107 default: 1108 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1109 xpl->sadb_x_policy_dir)); 1110 return EINVAL; 1111 } 1112 1113 return ipsec_get_policy(pcb_sp, mp); 1114} 1115 1116/* delete policy in PCB */ 1117int 1118ipsec4_delete_pcbpolicy(inp) 1119 struct inpcb *inp; 1120{ 1121 IPSEC_ASSERT(inp != NULL, ("null inp")); 1122 1123 if (inp->inp_sp == NULL) 1124 return 0; 1125 1126 if (inp->inp_sp->sp_in != NULL) 1127 KEY_FREESP(&inp->inp_sp->sp_in); 1128 1129 if (inp->inp_sp->sp_out != NULL) 1130 KEY_FREESP(&inp->inp_sp->sp_out); 1131 1132 ipsec_delpcbpolicy(inp->inp_sp); 1133 inp->inp_sp = NULL; 1134 1135 return 0; 1136} 1137 1138#ifdef INET6 1139int 1140ipsec6_set_policy(in6p, optname, request, len, priv) 1141 struct in6pcb *in6p; 1142 int optname; 1143 caddr_t request; 1144 size_t len; 1145 int priv; 1146{ 1147 struct sadb_x_policy *xpl; 1148 struct secpolicy **pcb_sp; 1149 1150 /* sanity check. */ 1151 if (in6p == NULL || request == NULL) 1152 return EINVAL; 1153 if (len < sizeof(*xpl)) 1154 return EINVAL; 1155 xpl = (struct sadb_x_policy *)request; 1156 1157 /* select direction */ 1158 switch (xpl->sadb_x_policy_dir) { 1159 case IPSEC_DIR_INBOUND: 1160 pcb_sp = &in6p->in6p_sp->sp_in; 1161 break; 1162 case IPSEC_DIR_OUTBOUND: 1163 pcb_sp = &in6p->in6p_sp->sp_out; 1164 break; 1165 default: 1166 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1167 xpl->sadb_x_policy_dir)); 1168 return EINVAL; 1169 } 1170 1171 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1172} 1173 1174int 1175ipsec6_get_policy(in6p, request, len, mp) 1176 struct in6pcb *in6p; 1177 caddr_t request; 1178 size_t len; 1179 struct mbuf **mp; 1180{ 1181 struct sadb_x_policy *xpl; 1182 struct secpolicy *pcb_sp; 1183 1184 /* sanity check. */ 1185 if (in6p == NULL || request == NULL || mp == NULL) 1186 return EINVAL; 1187 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1188 if (len < sizeof(*xpl)) 1189 return EINVAL; 1190 xpl = (struct sadb_x_policy *)request; 1191 1192 /* select direction */ 1193 switch (xpl->sadb_x_policy_dir) { 1194 case IPSEC_DIR_INBOUND: 1195 pcb_sp = in6p->in6p_sp->sp_in; 1196 break; 1197 case IPSEC_DIR_OUTBOUND: 1198 pcb_sp = in6p->in6p_sp->sp_out; 1199 break; 1200 default: 1201 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1202 xpl->sadb_x_policy_dir)); 1203 return EINVAL; 1204 } 1205 1206 return ipsec_get_policy(pcb_sp, mp); 1207} 1208 1209int 1210ipsec6_delete_pcbpolicy(in6p) 1211 struct in6pcb *in6p; 1212{ 1213 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1214 1215 if (in6p->in6p_sp == NULL) 1216 return 0; 1217 1218 if (in6p->in6p_sp->sp_in != NULL) 1219 KEY_FREESP(&in6p->in6p_sp->sp_in); 1220 1221 if (in6p->in6p_sp->sp_out != NULL) 1222 KEY_FREESP(&in6p->in6p_sp->sp_out); 1223 1224 ipsec_delpcbpolicy(in6p->in6p_sp); 1225 in6p->in6p_sp = NULL; 1226 1227 return 0; 1228} 1229#endif 1230 1231/* 1232 * return current level. 1233 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1234 */ 1235u_int 1236ipsec_get_reqlevel(isr) 1237 struct ipsecrequest *isr; 1238{ 1239 u_int level = 0; 1240 u_int esp_trans_deflev, esp_net_deflev; 1241 u_int ah_trans_deflev, ah_net_deflev; 1242 1243 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1244 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1245 ("af family mismatch, src %u, dst %u", 1246 isr->sp->spidx.src.sa.sa_family, 1247 isr->sp->spidx.dst.sa.sa_family)); 1248 1249/* XXX note that we have ipseclog() expanded here - code sync issue */ 1250#define IPSEC_CHECK_DEFAULT(lev) \ 1251 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1252 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1253 ? (ipsec_debug \ 1254 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1255 (lev), IPSEC_LEVEL_REQUIRE) \ 1256 : 0), \ 1257 (lev) = IPSEC_LEVEL_REQUIRE, \ 1258 (lev) \ 1259 : (lev)) 1260 1261 /* set default level */ 1262 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1263#ifdef INET 1264 case AF_INET: 1265 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1266 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1267 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1268 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1269 break; 1270#endif 1271#ifdef INET6 1272 case AF_INET6: 1273 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1274 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1275 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1276 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1277 break; 1278#endif /* INET6 */ 1279 default: 1280 panic("%s: unknown af %u", 1281 __func__, isr->sp->spidx.src.sa.sa_family); 1282 } 1283 1284#undef IPSEC_CHECK_DEFAULT 1285 1286 /* set level */ 1287 switch (isr->level) { 1288 case IPSEC_LEVEL_DEFAULT: 1289 switch (isr->saidx.proto) { 1290 case IPPROTO_ESP: 1291 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1292 level = esp_net_deflev; 1293 else 1294 level = esp_trans_deflev; 1295 break; 1296 case IPPROTO_AH: 1297 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1298 level = ah_net_deflev; 1299 else 1300 level = ah_trans_deflev; 1301 break; 1302 case IPPROTO_IPCOMP: 1303 /* 1304 * we don't really care, as IPcomp document says that 1305 * we shouldn't compress small packets 1306 */ 1307 level = IPSEC_LEVEL_USE; 1308 break; 1309 default: 1310 panic("%s: Illegal protocol defined %u\n", __func__, 1311 isr->saidx.proto); 1312 } 1313 break; 1314 1315 case IPSEC_LEVEL_USE: 1316 case IPSEC_LEVEL_REQUIRE: 1317 level = isr->level; 1318 break; 1319 case IPSEC_LEVEL_UNIQUE: 1320 level = IPSEC_LEVEL_REQUIRE; 1321 break; 1322 1323 default: 1324 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1325 } 1326 1327 return level; 1328} 1329 1330/* 1331 * Check security policy requirements against the actual 1332 * packet contents. Return one if the packet should be 1333 * reject as "invalid"; otherwiser return zero to have the 1334 * packet treated as "valid". 1335 * 1336 * OUT: 1337 * 0: valid 1338 * 1: invalid 1339 */ 1340int 1341ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1342{ 1343 struct ipsecrequest *isr; 1344 int need_auth; 1345 1346 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1347 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1348 1349 /* check policy */ 1350 switch (sp->policy) { 1351 case IPSEC_POLICY_DISCARD: 1352 return 1; 1353 case IPSEC_POLICY_BYPASS: 1354 case IPSEC_POLICY_NONE: 1355 return 0; 1356 } 1357 1358 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1359 ("invalid policy %u", sp->policy)); 1360 1361 /* XXX should compare policy against ipsec header history */ 1362 1363 need_auth = 0; 1364 for (isr = sp->req; isr != NULL; isr = isr->next) { 1365 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1366 continue; 1367 switch (isr->saidx.proto) { 1368 case IPPROTO_ESP: 1369 if ((m->m_flags & M_DECRYPTED) == 0) { 1370 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1371 printf("%s: ESP m_flags:%x\n", __func__, 1372 m->m_flags)); 1373 return 1; 1374 } 1375 1376 if (!need_auth && 1377 isr->sav != NULL && 1378 isr->sav->tdb_authalgxform != NULL && 1379 (m->m_flags & M_AUTHIPDGM) == 0) { 1380 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1381 printf("%s: ESP/AH m_flags:%x\n", __func__, 1382 m->m_flags)); 1383 return 1; 1384 } 1385 break; 1386 case IPPROTO_AH: 1387 need_auth = 1; 1388 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1389 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1390 printf("%s: AH m_flags:%x\n", __func__, 1391 m->m_flags)); 1392 return 1; 1393 } 1394 break; 1395 case IPPROTO_IPCOMP: 1396 /* 1397 * we don't really care, as IPcomp document 1398 * says that we shouldn't compress small 1399 * packets, IPComp policy should always be 1400 * treated as being in "use" level. 1401 */ 1402 break; 1403 } 1404 } 1405 return 0; /* valid */ 1406} 1407 1408/* 1409 * Check AH/ESP integrity. 1410 * This function is called from tcp_input(), udp_input(), 1411 * and {ah,esp}4_input for tunnel mode 1412 */ 1413int 1414ipsec4_in_reject(m, inp) 1415 struct mbuf *m; 1416 struct inpcb *inp; 1417{ 1418 struct secpolicy *sp; 1419 int error; 1420 int result; 1421 1422 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1423 1424 /* get SP for this packet. 1425 * When we are called from ip_forward(), we call 1426 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1427 */ 1428 if (inp == NULL) 1429 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1430 else 1431 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1432 1433 if (sp != NULL) { 1434 result = ipsec_in_reject(sp, m); 1435 if (result) 1436 newipsecstat.ips_in_polvio++; 1437 KEY_FREESP(&sp); 1438 } else { 1439 result = 0; /* XXX should be panic ? 1440 * -> No, there may be error. */ 1441 } 1442 return result; 1443} 1444 1445#ifdef INET6 1446/* 1447 * Check AH/ESP integrity. 1448 * This function is called from tcp6_input(), udp6_input(), 1449 * and {ah,esp}6_input for tunnel mode 1450 */ 1451int 1452ipsec6_in_reject(m, inp) 1453 struct mbuf *m; 1454 struct inpcb *inp; 1455{ 1456 struct secpolicy *sp = NULL; 1457 int error; 1458 int result; 1459 1460 /* sanity check */ 1461 if (m == NULL) 1462 return 0; /* XXX should be panic ? */ 1463 1464 /* get SP for this packet. 1465 * When we are called from ip_forward(), we call 1466 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1467 */ 1468 if (inp == NULL) 1469 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1470 else 1471 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1472 1473 if (sp != NULL) { 1474 result = ipsec_in_reject(sp, m); 1475 if (result) 1476 newipsecstat.ips_in_polvio++; 1477 KEY_FREESP(&sp); 1478 } else { 1479 result = 0; 1480 } 1481 return result; 1482} 1483#endif 1484 1485/* 1486 * compute the byte size to be occupied by IPsec header. 1487 * in case it is tunneled, it includes the size of outer IP header. 1488 * NOTE: SP passed is free in this function. 1489 */ 1490static size_t 1491ipsec_hdrsiz(struct secpolicy *sp) 1492{ 1493 struct ipsecrequest *isr; 1494 size_t siz; 1495 1496 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1497 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1498 1499 switch (sp->policy) { 1500 case IPSEC_POLICY_DISCARD: 1501 case IPSEC_POLICY_BYPASS: 1502 case IPSEC_POLICY_NONE: 1503 return 0; 1504 } 1505 1506 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1507 ("invalid policy %u", sp->policy)); 1508 1509 siz = 0; 1510 for (isr = sp->req; isr != NULL; isr = isr->next) { 1511 size_t clen = 0; 1512 1513 switch (isr->saidx.proto) { 1514 case IPPROTO_ESP: 1515 clen = esp_hdrsiz(isr->sav); 1516 break; 1517 case IPPROTO_AH: 1518 clen = ah_hdrsiz(isr->sav); 1519 break; 1520 case IPPROTO_IPCOMP: 1521 clen = sizeof(struct ipcomp); 1522 break; 1523 } 1524 1525 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1526 switch (isr->saidx.dst.sa.sa_family) { 1527 case AF_INET: 1528 clen += sizeof(struct ip); 1529 break; 1530#ifdef INET6 1531 case AF_INET6: 1532 clen += sizeof(struct ip6_hdr); 1533 break; 1534#endif 1535 default: 1536 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1537 "IPsec tunnel SA\n", __func__, 1538 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1539 break; 1540 } 1541 } 1542 siz += clen; 1543 } 1544 1545 return siz; 1546} 1547 1548/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1549size_t 1550ipsec4_hdrsiz(m, dir, inp) 1551 struct mbuf *m; 1552 u_int dir; 1553 struct inpcb *inp; 1554{ 1555 struct secpolicy *sp; 1556 int error; 1557 size_t size; 1558 1559 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1560 1561 /* get SP for this packet. 1562 * When we are called from ip_forward(), we call 1563 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1564 */ 1565 if (inp == NULL) 1566 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1567 else 1568 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1569 1570 if (sp != NULL) { 1571 size = ipsec_hdrsiz(sp); 1572 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1573 printf("%s: size:%lu.\n", __func__, 1574 (unsigned long)size)); 1575 1576 KEY_FREESP(&sp); 1577 } else { 1578 size = 0; /* XXX should be panic ? */ 1579 } 1580 return size; 1581} 1582 1583#ifdef INET6 1584/* This function is called from ipsec6_hdrsize_tcp(), 1585 * and maybe from ip6_forward.() 1586 */ 1587size_t 1588ipsec6_hdrsiz(m, dir, in6p) 1589 struct mbuf *m; 1590 u_int dir; 1591 struct in6pcb *in6p; 1592{ 1593 struct secpolicy *sp; 1594 int error; 1595 size_t size; 1596 1597 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1598 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1599 ("socket w/o inpcb")); 1600 1601 /* get SP for this packet */ 1602 /* XXX Is it right to call with IP_FORWARDING. */ 1603 if (in6p == NULL) 1604 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1605 else 1606 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1607 1608 if (sp == NULL) 1609 return 0; 1610 size = ipsec_hdrsiz(sp); 1611 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1612 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1613 KEY_FREESP(&sp); 1614 1615 return size; 1616} 1617#endif /*INET6*/ 1618 1619/* 1620 * Check the variable replay window. 1621 * ipsec_chkreplay() performs replay check before ICV verification. 1622 * ipsec_updatereplay() updates replay bitmap. This must be called after 1623 * ICV verification (it also performs replay check, which is usually done 1624 * beforehand). 1625 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1626 * 1627 * based on RFC 2401. 1628 */ 1629int 1630ipsec_chkreplay(seq, sav) 1631 u_int32_t seq; 1632 struct secasvar *sav; 1633{ 1634 const struct secreplay *replay; 1635 u_int32_t diff; 1636 int fr; 1637 u_int32_t wsizeb; /* constant: bits of window size */ 1638 int frlast; /* constant: last frame */ 1639 1640 IPSEC_SPLASSERT_SOFTNET(__func__); 1641 1642 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1643 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1644 1645 replay = sav->replay; 1646 1647 if (replay->wsize == 0) 1648 return 1; /* no need to check replay. */ 1649 1650 /* constant */ 1651 frlast = replay->wsize - 1; 1652 wsizeb = replay->wsize << 3; 1653 1654 /* sequence number of 0 is invalid */ 1655 if (seq == 0) 1656 return 0; 1657 1658 /* first time is always okay */ 1659 if (replay->count == 0) 1660 return 1; 1661 1662 if (seq > replay->lastseq) { 1663 /* larger sequences are okay */ 1664 return 1; 1665 } else { 1666 /* seq is equal or less than lastseq. */ 1667 diff = replay->lastseq - seq; 1668 1669 /* over range to check, i.e. too old or wrapped */ 1670 if (diff >= wsizeb) 1671 return 0; 1672 1673 fr = frlast - diff / 8; 1674 1675 /* this packet already seen ? */ 1676 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1677 return 0; 1678 1679 /* out of order but good */ 1680 return 1; 1681 } 1682} 1683 1684/* 1685 * check replay counter whether to update or not. 1686 * OUT: 0: OK 1687 * 1: NG 1688 */ 1689int 1690ipsec_updatereplay(seq, sav) 1691 u_int32_t seq; 1692 struct secasvar *sav; 1693{ 1694 struct secreplay *replay; 1695 u_int32_t diff; 1696 int fr; 1697 u_int32_t wsizeb; /* constant: bits of window size */ 1698 int frlast; /* constant: last frame */ 1699 1700 IPSEC_SPLASSERT_SOFTNET(__func__); 1701 1702 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1703 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1704 1705 replay = sav->replay; 1706 1707 if (replay->wsize == 0) 1708 goto ok; /* no need to check replay. */ 1709 1710 /* constant */ 1711 frlast = replay->wsize - 1; 1712 wsizeb = replay->wsize << 3; 1713 1714 /* sequence number of 0 is invalid */ 1715 if (seq == 0) 1716 return 1; 1717 1718 /* first time */ 1719 if (replay->count == 0) { 1720 replay->lastseq = seq; 1721 bzero(replay->bitmap, replay->wsize); 1722 (replay->bitmap)[frlast] = 1; 1723 goto ok; 1724 } 1725 1726 if (seq > replay->lastseq) { 1727 /* seq is larger than lastseq. */ 1728 diff = seq - replay->lastseq; 1729 1730 /* new larger sequence number */ 1731 if (diff < wsizeb) { 1732 /* In window */ 1733 /* set bit for this packet */ 1734 vshiftl(replay->bitmap, diff, replay->wsize); 1735 (replay->bitmap)[frlast] |= 1; 1736 } else { 1737 /* this packet has a "way larger" */ 1738 bzero(replay->bitmap, replay->wsize); 1739 (replay->bitmap)[frlast] = 1; 1740 } 1741 replay->lastseq = seq; 1742 1743 /* larger is good */ 1744 } else { 1745 /* seq is equal or less than lastseq. */ 1746 diff = replay->lastseq - seq; 1747 1748 /* over range to check, i.e. too old or wrapped */ 1749 if (diff >= wsizeb) 1750 return 1; 1751 1752 fr = frlast - diff / 8; 1753 1754 /* this packet already seen ? */ 1755 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1756 return 1; 1757 1758 /* mark as seen */ 1759 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1760 1761 /* out of order but good */ 1762 } 1763 1764ok: 1765 if (replay->count == ~0) { 1766 1767 /* set overflow flag */ 1768 replay->overflow++; 1769 1770 /* don't increment, no more packets accepted */ 1771 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1772 return 1; 1773 1774 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1775 __func__, replay->overflow, ipsec_logsastr(sav))); 1776 } 1777 1778 replay->count++; 1779 1780 return 0; 1781} 1782 1783/* 1784 * shift variable length buffer to left. 1785 * IN: bitmap: pointer to the buffer 1786 * nbit: the number of to shift. 1787 * wsize: buffer size (bytes). 1788 */ 1789static void 1790vshiftl(bitmap, nbit, wsize) 1791 unsigned char *bitmap; 1792 int nbit, wsize; 1793{ 1794 int s, j, i; 1795 unsigned char over; 1796 1797 for (j = 0; j < nbit; j += 8) { 1798 s = (nbit - j < 8) ? (nbit - j): 8; 1799 bitmap[0] <<= s; 1800 for (i = 1; i < wsize; i++) { 1801 over = (bitmap[i] >> (8 - s)); 1802 bitmap[i] <<= s; 1803 bitmap[i-1] |= over; 1804 } 1805 } 1806 1807 return; 1808} 1809 1810/* Return a printable string for the IPv4 address. */ 1811static char * 1812inet_ntoa4(struct in_addr ina) 1813{ 1814 static char buf[4][4 * sizeof "123" + 4]; 1815 unsigned char *ucp = (unsigned char *) &ina; 1816 static int i = 3; 1817 1818 i = (i + 1) % 4; 1819 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1820 ucp[2] & 0xff, ucp[3] & 0xff); 1821 return (buf[i]); 1822} 1823 1824/* Return a printable string for the address. */ 1825char * 1826ipsec_address(union sockaddr_union* sa) 1827{ 1828 switch (sa->sa.sa_family) { 1829#if INET 1830 case AF_INET: 1831 return inet_ntoa4(sa->sin.sin_addr); 1832#endif /* INET */ 1833 1834#if INET6 1835 case AF_INET6: 1836 return ip6_sprintf(&sa->sin6.sin6_addr); 1837#endif /* INET6 */ 1838 1839 default: 1840 return "(unknown address family)"; 1841 } 1842} 1843 1844const char * 1845ipsec_logsastr(sav) 1846 struct secasvar *sav; 1847{ 1848 static char buf[256]; 1849 char *p; 1850 struct secasindex *saidx = &sav->sah->saidx; 1851 1852 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1853 ("address family mismatch")); 1854 1855 p = buf; 1856 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1857 while (p && *p) 1858 p++; 1859 /* NB: only use ipsec_address on one address at a time */ 1860 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1861 ipsec_address(&saidx->src)); 1862 while (p && *p) 1863 p++; 1864 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1865 ipsec_address(&saidx->dst)); 1866 1867 return buf; 1868} 1869 1870void 1871ipsec_dumpmbuf(m) 1872 struct mbuf *m; 1873{ 1874 int totlen; 1875 int i; 1876 u_char *p; 1877 1878 totlen = 0; 1879 printf("---\n"); 1880 while (m) { 1881 p = mtod(m, u_char *); 1882 for (i = 0; i < m->m_len; i++) { 1883 printf("%02x ", p[i]); 1884 totlen++; 1885 if (totlen % 16 == 0) 1886 printf("\n"); 1887 } 1888 m = m->m_next; 1889 } 1890 if (totlen % 16 != 0) 1891 printf("\n"); 1892 printf("---\n"); 1893} 1894 1895static void 1896ipsec_attach(void) 1897{ 1898 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1899 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1900} 1901SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL) 1902 1903 1904/* XXX this stuff doesn't belong here... */ 1905 1906static struct xformsw* xforms = NULL; 1907 1908/* 1909 * Register a transform; typically at system startup. 1910 */ 1911void 1912xform_register(struct xformsw* xsp) 1913{ 1914 xsp->xf_next = xforms; 1915 xforms = xsp; 1916} 1917 1918/* 1919 * Initialize transform support in an sav. 1920 */ 1921int 1922xform_init(struct secasvar *sav, int xftype) 1923{ 1924 struct xformsw *xsp; 1925 1926 if (sav->tdb_xform != NULL) /* previously initialized */ 1927 return 0; 1928 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1929 if (xsp->xf_type == xftype) 1930 return (*xsp->xf_init)(sav, xsp); 1931 return EINVAL; 1932} 1933