ipsec.c revision 111396
1/* $FreeBSD: head/sys/netipsec/ipsec.c 111396 2003-02-24 02:06:02Z jlemon $ */ 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#include <net/net_osdep.h> 96 97#ifdef IPSEC_DEBUG 98int ipsec_debug = 1; 99#else 100int ipsec_debug = 0; 101#endif 102 103/* NB: name changed so netstat doesn't use it */ 104struct newipsecstat newipsecstat; 105int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 106int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 107int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 108int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 109int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 110int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 111struct secpolicy ip4_def_policy; 112int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 113int ip4_esp_randpad = -1; 114/* 115 * Crypto support requirements: 116 * 117 * 1 require hardware support 118 * -1 require software support 119 * 0 take anything 120 */ 121int crypto_support = 0; 122 123SYSCTL_DECL(_net_inet_ipsec); 124 125/* net.inet.ipsec */ 126SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 127 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 128SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 129 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 130SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 131 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 132SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 133 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 134SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 135 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 136SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 137 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 138SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 139 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 140SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 141 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 142SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 143 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 144SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 145 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 146SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 147 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 148SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 149 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 150SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 151 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 152 153#ifdef INET6 154int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 155int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 156int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 157int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 158int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 159int ip6_esp_randpad = -1; 160 161SYSCTL_DECL(_net_inet6_ipsec6); 162 163/* net.inet6.ipsec6 */ 164#ifdef COMPAT_KAME 165SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 166 0,0, compat_ipsecstats_sysctl, "S", ""); 167#endif /* COMPAT_KAME */ 168SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 169 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 170SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 171 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 172SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 173 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 174SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 175 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 176SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 177 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 178SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 179 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 180SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 181 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 182SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 183 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 184#endif /* INET6 */ 185 186static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 187#ifdef INET6 188static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 189#endif 190static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 191static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 192static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 193#ifdef INET6 194static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 195static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 196#endif 197static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 198static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 199static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 200 int optname, caddr_t request, size_t len, int priv)); 201static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 202static void vshiftl __P((unsigned char *, int, int)); 203static size_t ipsec_hdrsiz __P((struct secpolicy *)); 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 KASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 251 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 252 ("ipsec_getpolicy: 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 KASSERT(sp != NULL, ("ipsec_getpolicy: 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 KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 285 KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 286 KASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 287 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 288 ("ipsec_getpolicybysock: invalid direction %u", dir)); 289 290 /* set spidx in pcb */ 291 if (inp->inp_vflag & INP_IPV6PROTO) { 292 *error = ipsec6_setspidx_in6pcb(m, inp); 293 pcbsp = inp->in6p_sp; 294 } else { 295 *error = ipsec4_setspidx_inpcb(m, inp); 296 pcbsp = inp->inp_sp; 297 } 298 if (*error) 299 return NULL; 300 301 KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 302 switch (dir) { 303 case IPSEC_DIR_INBOUND: 304 currsp = pcbsp->sp_in; 305 break; 306 case IPSEC_DIR_OUTBOUND: 307 currsp = pcbsp->sp_out; 308 break; 309 } 310 KASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 311 312 if (pcbsp->priv) { /* when privilieged socket */ 313 switch (currsp->policy) { 314 case IPSEC_POLICY_BYPASS: 315 case IPSEC_POLICY_IPSEC: 316 currsp->refcnt++; 317 sp = currsp; 318 break; 319 320 case IPSEC_POLICY_ENTRUST: 321 /* look for a policy in SPD */ 322 sp = KEY_ALLOCSP(&currsp->spidx, dir); 323 if (sp == NULL) /* no SP found */ 324 sp = KEY_ALLOCSP_DEFAULT(); 325 break; 326 327 default: 328 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 329 "Invalid policy for PCB %d\n", currsp->policy)); 330 *error = EINVAL; 331 return NULL; 332 } 333 } else { /* unpriv, SPD has policy */ 334 sp = KEY_ALLOCSP(&currsp->spidx, dir); 335 if (sp == NULL) { /* no SP found */ 336 switch (currsp->policy) { 337 case IPSEC_POLICY_BYPASS: 338 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 339 "Illegal policy for non-priviliged defined %d\n", 340 currsp->policy)); 341 *error = EINVAL; 342 return NULL; 343 344 case IPSEC_POLICY_ENTRUST: 345 sp = KEY_ALLOCSP_DEFAULT(); 346 break; 347 348 case IPSEC_POLICY_IPSEC: 349 currsp->refcnt++; 350 sp = currsp; 351 break; 352 353 default: 354 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 355 "Invalid policy for PCB %d\n", currsp->policy)); 356 *error = EINVAL; 357 return NULL; 358 } 359 } 360 } 361 KASSERT(sp != NULL, 362 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 363 pcbsp->priv, currsp->policy)); 364 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 365 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 366 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 367 sp, sp->refcnt)); 368 return sp; 369} 370 371/* 372 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 373 * and return a pointer to SP. 374 * OUT: positive: a pointer to the entry for security policy leaf matched. 375 * NULL: no apropreate SP found, the following value is set to error. 376 * 0 : bypass 377 * EACCES : discard packet. 378 * ENOENT : ipsec_acquire() in progress, maybe. 379 * others : error occured. 380 */ 381struct secpolicy * 382ipsec_getpolicybyaddr(m, dir, flag, error) 383 struct mbuf *m; 384 u_int dir; 385 int flag; 386 int *error; 387{ 388 struct secpolicyindex spidx; 389 struct secpolicy *sp; 390 391 KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 392 KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 393 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 394 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 395 396 sp = NULL; 397 if (key_havesp(dir)) { 398 /* Make an index to look for a policy. */ 399 *error = ipsec_setspidx(m, &spidx, 400 (flag & IP_FORWARDING) ? 0 : 1); 401 if (*error != 0) { 402 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 403 " dir %u flag %u\n", dir, flag)); 404 bzero(&spidx, sizeof (spidx)); 405 return NULL; 406 } 407 spidx.dir = dir; 408 409 sp = KEY_ALLOCSP(&spidx, dir); 410 } 411 if (sp == NULL) /* no SP found, use system default */ 412 sp = KEY_ALLOCSP_DEFAULT(); 413 KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 414 return sp; 415} 416 417struct secpolicy * 418ipsec4_checkpolicy(m, dir, flag, error, inp) 419 struct mbuf *m; 420 u_int dir, flag; 421 int *error; 422 struct inpcb *inp; 423{ 424 struct secpolicy *sp; 425 426 *error = 0; 427 if (inp == NULL) 428 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 429 else 430 sp = ipsec_getpolicybysock(m, dir, inp, error); 431 if (sp == NULL) { 432 KASSERT(*error != 0, 433 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 434 newipsecstat.ips_out_inval++; 435 return NULL; 436 } 437 KASSERT(*error == 0, 438 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 439 switch (sp->policy) { 440 case IPSEC_POLICY_ENTRUST: 441 default: 442 printf("ipsec4_checkpolicy: invalid policy %u\n", 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 KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 473 KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 474 KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 475 ("ipsec4_setspidx_inpcb: 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 KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 501 KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 502 KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 503 ("ipsec6_setspidx_in6pcb: 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 KASSERT(m != NULL, ("ipsec_setspidx: 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("ipsec_setspidx: " 560 "total of m_len(%d) != pkthdr.len(%d), " 561 "ignored.\n", 562 len, m->m_pkthdr.len)); 563 return EINVAL; 564 } 565 566 if (m->m_pkthdr.len < sizeof(struct ip)) { 567 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 568 printf("ipsec_setspidx: " 569 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 570 m->m_pkthdr.len)); 571 return EINVAL; 572 } 573 574 if (m->m_len >= sizeof(*ip)) 575 ip = mtod(m, struct ip *); 576 else { 577 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 578 ip = &ipbuf; 579 } 580#ifdef _IP_VHL 581 v = _IP_VHL_V(ip->ip_vhl); 582#else 583 v = ip->ip_v; 584#endif 585 switch (v) { 586 case 4: 587 error = ipsec4_setspidx_ipaddr(m, spidx); 588 if (error) 589 return error; 590 ipsec4_get_ulp(m, spidx, needport); 591 return 0; 592#ifdef INET6 593 case 6: 594 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 595 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 596 printf("ipsec_setspidx: " 597 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 598 "ignored.\n", m->m_pkthdr.len)); 599 return EINVAL; 600 } 601 error = ipsec6_setspidx_ipaddr(m, spidx); 602 if (error) 603 return error; 604 ipsec6_get_ulp(m, spidx, needport); 605 return 0; 606#endif 607 default: 608 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 609 printf("ipsec_setspidx: " 610 "unknown IP version %u, ignored.\n", v)); 611 return EINVAL; 612 } 613} 614 615static void 616ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 617{ 618 u_int8_t nxt; 619 int off; 620 621 /* sanity check */ 622 KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 623 KASSERT(m->m_pkthdr.len >= sizeof(struct ip), 624 ("ipsec4_get_ulp: packet too short")); 625 626 /* NB: ip_input() flips it into host endian XXX need more checking */ 627 if (m->m_len < sizeof (struct ip)) { 628 struct ip *ip = mtod(m, struct ip *); 629 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 630 goto done; 631#ifdef _IP_VHL 632 off = _IP_VHL_HL(ip->ip_vhl) << 2; 633#else 634 off = ip->ip_hl << 2; 635#endif 636 nxt = ip->ip_p; 637 } else { 638 struct ip ih; 639 640 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 641 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 642 goto done; 643#ifdef _IP_VHL 644 off = _IP_VHL_HL(ih.ip_vhl) << 2; 645#else 646 off = ih.ip_hl << 2; 647#endif 648 nxt = ih.ip_p; 649 } 650 651 while (off < m->m_pkthdr.len) { 652 struct ip6_ext ip6e; 653 struct tcphdr th; 654 struct udphdr uh; 655 656 switch (nxt) { 657 case IPPROTO_TCP: 658 spidx->ul_proto = nxt; 659 if (!needport) 660 goto done_proto; 661 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 662 goto done; 663 m_copydata(m, off, sizeof (th), (caddr_t) &th); 664 spidx->src.sin.sin_port = th.th_sport; 665 spidx->dst.sin.sin_port = th.th_dport; 666 return; 667 case IPPROTO_UDP: 668 spidx->ul_proto = nxt; 669 if (!needport) 670 goto done_proto; 671 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 672 goto done; 673 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 674 spidx->src.sin.sin_port = uh.uh_sport; 675 spidx->dst.sin.sin_port = uh.uh_dport; 676 return; 677 case IPPROTO_AH: 678 if (m->m_pkthdr.len > off + sizeof(ip6e)) 679 goto done; 680 /* XXX sigh, this works but is totally bogus */ 681 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 682 off += (ip6e.ip6e_len + 2) << 2; 683 nxt = ip6e.ip6e_nxt; 684 break; 685 case IPPROTO_ICMP: 686 default: 687 /* XXX intermediate headers??? */ 688 spidx->ul_proto = nxt; 689 goto done_proto; 690 } 691 } 692done: 693 spidx->ul_proto = IPSEC_ULPROTO_ANY; 694done_proto: 695 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 696 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 697} 698 699/* assumes that m is sane */ 700static int 701ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 702{ 703 static const struct sockaddr_in template = { 704 sizeof (struct sockaddr_in), 705 AF_INET, 706 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 707 }; 708 709 spidx->src.sin = template; 710 spidx->dst.sin = template; 711 712 if (m->m_len < sizeof (struct ip)) { 713 m_copydata(m, offsetof(struct ip, ip_src), 714 sizeof (struct in_addr), 715 (caddr_t) &spidx->src.sin.sin_addr); 716 m_copydata(m, offsetof(struct ip, ip_dst), 717 sizeof (struct in_addr), 718 (caddr_t) &spidx->dst.sin.sin_addr); 719 } else { 720 struct ip *ip = mtod(m, struct ip *); 721 spidx->src.sin.sin_addr = ip->ip_src; 722 spidx->dst.sin.sin_addr = ip->ip_dst; 723 } 724 725 spidx->prefs = sizeof(struct in_addr) << 3; 726 spidx->prefd = sizeof(struct in_addr) << 3; 727 728 return 0; 729} 730 731#ifdef INET6 732static void 733ipsec6_get_ulp(m, spidx, needport) 734 struct mbuf *m; 735 struct secpolicyindex *spidx; 736 int needport; 737{ 738 int off, nxt; 739 struct tcphdr th; 740 struct udphdr uh; 741 742 /* sanity check */ 743 if (m == NULL) 744 panic("ipsec6_get_ulp: NULL pointer was passed.\n"); 745 746 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 747 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 748 749 /* set default */ 750 spidx->ul_proto = IPSEC_ULPROTO_ANY; 751 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 752 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 753 754 nxt = -1; 755 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 756 if (off < 0 || m->m_pkthdr.len < off) 757 return; 758 759 switch (nxt) { 760 case IPPROTO_TCP: 761 spidx->ul_proto = nxt; 762 if (!needport) 763 break; 764 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 765 break; 766 m_copydata(m, off, sizeof(th), (caddr_t)&th); 767 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 768 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 769 break; 770 case IPPROTO_UDP: 771 spidx->ul_proto = nxt; 772 if (!needport) 773 break; 774 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 775 break; 776 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 777 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 778 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 779 break; 780 case IPPROTO_ICMPV6: 781 default: 782 /* XXX intermediate headers??? */ 783 spidx->ul_proto = nxt; 784 break; 785 } 786} 787 788/* assumes that m is sane */ 789static int 790ipsec6_setspidx_ipaddr(m, spidx) 791 struct mbuf *m; 792 struct secpolicyindex *spidx; 793{ 794 struct ip6_hdr *ip6 = NULL; 795 struct ip6_hdr ip6buf; 796 struct sockaddr_in6 *sin6; 797 798 if (m->m_len >= sizeof(*ip6)) 799 ip6 = mtod(m, struct ip6_hdr *); 800 else { 801 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 802 ip6 = &ip6buf; 803 } 804 805 sin6 = (struct sockaddr_in6 *)&spidx->src; 806 bzero(sin6, sizeof(*sin6)); 807 sin6->sin6_family = AF_INET6; 808 sin6->sin6_len = sizeof(struct sockaddr_in6); 809 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 810 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 811 sin6->sin6_addr.s6_addr16[1] = 0; 812 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 813 } 814 spidx->prefs = sizeof(struct in6_addr) << 3; 815 816 sin6 = (struct sockaddr_in6 *)&spidx->dst; 817 bzero(sin6, sizeof(*sin6)); 818 sin6->sin6_family = AF_INET6; 819 sin6->sin6_len = sizeof(struct sockaddr_in6); 820 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 821 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 822 sin6->sin6_addr.s6_addr16[1] = 0; 823 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 824 } 825 spidx->prefd = sizeof(struct in6_addr) << 3; 826 827 return 0; 828} 829#endif 830 831static void 832ipsec_delpcbpolicy(p) 833 struct inpcbpolicy *p; 834{ 835 free(p, M_SECA); 836} 837 838/* initialize policy in PCB */ 839int 840ipsec_init_policy(so, pcb_sp) 841 struct socket *so; 842 struct inpcbpolicy **pcb_sp; 843{ 844 struct inpcbpolicy *new; 845 846 /* sanity check. */ 847 if (so == NULL || pcb_sp == NULL) 848 panic("ipsec_init_policy: NULL pointer was passed.\n"); 849 850 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 851 M_SECA, M_NOWAIT|M_ZERO); 852 if (new == NULL) { 853 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 854 return ENOBUFS; 855 } 856 857 if (so->so_cred != 0 && so->so_cred->cr_uid == 0) 858 new->priv = 1; 859 else 860 new->priv = 0; 861 862 if ((new->sp_in = KEY_NEWSP()) == NULL) { 863 ipsec_delpcbpolicy(new); 864 return ENOBUFS; 865 } 866 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 867 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 868 869 if ((new->sp_out = KEY_NEWSP()) == NULL) { 870 KEY_FREESP(&new->sp_in); 871 ipsec_delpcbpolicy(new); 872 return ENOBUFS; 873 } 874 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 875 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 876 877 *pcb_sp = new; 878 879 return 0; 880} 881 882/* copy old ipsec policy into new */ 883int 884ipsec_copy_policy(old, new) 885 struct inpcbpolicy *old, *new; 886{ 887 struct secpolicy *sp; 888 889 sp = ipsec_deepcopy_policy(old->sp_in); 890 if (sp) { 891 KEY_FREESP(&new->sp_in); 892 new->sp_in = sp; 893 } else 894 return ENOBUFS; 895 896 sp = ipsec_deepcopy_policy(old->sp_out); 897 if (sp) { 898 KEY_FREESP(&new->sp_out); 899 new->sp_out = sp; 900 } else 901 return ENOBUFS; 902 903 new->priv = old->priv; 904 905 return 0; 906} 907 908/* deep-copy a policy in PCB */ 909static struct secpolicy * 910ipsec_deepcopy_policy(src) 911 struct secpolicy *src; 912{ 913 struct ipsecrequest *newchain = NULL; 914 struct ipsecrequest *p; 915 struct ipsecrequest **q; 916 struct ipsecrequest *r; 917 struct secpolicy *dst; 918 919 if (src == NULL) 920 return NULL; 921 dst = KEY_NEWSP(); 922 if (dst == NULL) 923 return NULL; 924 925 /* 926 * deep-copy IPsec request chain. This is required since struct 927 * ipsecrequest is not reference counted. 928 */ 929 q = &newchain; 930 for (p = src->req; p; p = p->next) { 931 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 932 M_SECA, M_NOWAIT); 933 if (*q == NULL) 934 goto fail; 935 bzero(*q, sizeof(**q)); 936 (*q)->next = NULL; 937 938 (*q)->saidx.proto = p->saidx.proto; 939 (*q)->saidx.mode = p->saidx.mode; 940 (*q)->level = p->level; 941 (*q)->saidx.reqid = p->saidx.reqid; 942 943 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 944 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 945 946 (*q)->sav = NULL; 947 (*q)->sp = dst; 948 949 q = &((*q)->next); 950 } 951 952 dst->req = newchain; 953 dst->state = src->state; 954 dst->policy = src->policy; 955 /* do not touch the refcnt fields */ 956 957 return dst; 958 959fail: 960 for (p = newchain; p; p = r) { 961 r = p->next; 962 free(p, M_SECA); 963 p = NULL; 964 } 965 return NULL; 966} 967 968/* set policy and ipsec request if present. */ 969static int 970ipsec_set_policy(pcb_sp, optname, request, len, priv) 971 struct secpolicy **pcb_sp; 972 int optname; 973 caddr_t request; 974 size_t len; 975 int priv; 976{ 977 struct sadb_x_policy *xpl; 978 struct secpolicy *newsp = NULL; 979 int error; 980 981 /* sanity check. */ 982 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 983 return EINVAL; 984 if (len < sizeof(*xpl)) 985 return EINVAL; 986 xpl = (struct sadb_x_policy *)request; 987 988 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 989 printf("ipsec_set_policy: passed policy\n"); 990 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 991 992 /* check policy type */ 993 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 994 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 995 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 996 return EINVAL; 997 998 /* check privileged socket */ 999 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1000 return EACCES; 1001 1002 /* allocation new SP entry */ 1003 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1004 return error; 1005 1006 newsp->state = IPSEC_SPSTATE_ALIVE; 1007 1008 /* clear old SP and set new SP */ 1009 KEY_FREESP(pcb_sp); 1010 *pcb_sp = newsp; 1011 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1012 printf("ipsec_set_policy: new policy\n"); 1013 kdebug_secpolicy(newsp)); 1014 1015 return 0; 1016} 1017 1018static int 1019ipsec_get_policy(pcb_sp, mp) 1020 struct secpolicy *pcb_sp; 1021 struct mbuf **mp; 1022{ 1023 1024 /* sanity check. */ 1025 if (pcb_sp == NULL || mp == NULL) 1026 return EINVAL; 1027 1028 *mp = key_sp2msg(pcb_sp); 1029 if (!*mp) { 1030 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1031 return ENOBUFS; 1032 } 1033 1034 (*mp)->m_type = MT_DATA; 1035 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1036 printf("ipsec_get_policy:\n"); 1037 kdebug_mbuf(*mp)); 1038 1039 return 0; 1040} 1041 1042int 1043ipsec4_set_policy(inp, optname, request, len, priv) 1044 struct inpcb *inp; 1045 int optname; 1046 caddr_t request; 1047 size_t len; 1048 int priv; 1049{ 1050 struct sadb_x_policy *xpl; 1051 struct secpolicy **pcb_sp; 1052 1053 /* sanity check. */ 1054 if (inp == NULL || request == NULL) 1055 return EINVAL; 1056 if (len < sizeof(*xpl)) 1057 return EINVAL; 1058 xpl = (struct sadb_x_policy *)request; 1059 1060 /* select direction */ 1061 switch (xpl->sadb_x_policy_dir) { 1062 case IPSEC_DIR_INBOUND: 1063 pcb_sp = &inp->inp_sp->sp_in; 1064 break; 1065 case IPSEC_DIR_OUTBOUND: 1066 pcb_sp = &inp->inp_sp->sp_out; 1067 break; 1068 default: 1069 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1070 xpl->sadb_x_policy_dir)); 1071 return EINVAL; 1072 } 1073 1074 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1075} 1076 1077int 1078ipsec4_get_policy(inp, request, len, mp) 1079 struct inpcb *inp; 1080 caddr_t request; 1081 size_t len; 1082 struct mbuf **mp; 1083{ 1084 struct sadb_x_policy *xpl; 1085 struct secpolicy *pcb_sp; 1086 1087 /* sanity check. */ 1088 if (inp == NULL || request == NULL || mp == NULL) 1089 return EINVAL; 1090 KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1091 if (len < sizeof(*xpl)) 1092 return EINVAL; 1093 xpl = (struct sadb_x_policy *)request; 1094 1095 /* select direction */ 1096 switch (xpl->sadb_x_policy_dir) { 1097 case IPSEC_DIR_INBOUND: 1098 pcb_sp = inp->inp_sp->sp_in; 1099 break; 1100 case IPSEC_DIR_OUTBOUND: 1101 pcb_sp = inp->inp_sp->sp_out; 1102 break; 1103 default: 1104 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1105 xpl->sadb_x_policy_dir)); 1106 return EINVAL; 1107 } 1108 1109 return ipsec_get_policy(pcb_sp, mp); 1110} 1111 1112/* delete policy in PCB */ 1113int 1114ipsec4_delete_pcbpolicy(inp) 1115 struct inpcb *inp; 1116{ 1117 KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1118 1119 if (inp->inp_sp == NULL) 1120 return 0; 1121 1122 if (inp->inp_sp->sp_in != NULL) 1123 KEY_FREESP(&inp->inp_sp->sp_in); 1124 1125 if (inp->inp_sp->sp_out != NULL) 1126 KEY_FREESP(&inp->inp_sp->sp_out); 1127 1128 ipsec_delpcbpolicy(inp->inp_sp); 1129 inp->inp_sp = NULL; 1130 1131 return 0; 1132} 1133 1134#ifdef INET6 1135int 1136ipsec6_set_policy(in6p, optname, request, len, priv) 1137 struct in6pcb *in6p; 1138 int optname; 1139 caddr_t request; 1140 size_t len; 1141 int priv; 1142{ 1143 struct sadb_x_policy *xpl; 1144 struct secpolicy **pcb_sp; 1145 1146 /* sanity check. */ 1147 if (in6p == NULL || request == NULL) 1148 return EINVAL; 1149 if (len < sizeof(*xpl)) 1150 return EINVAL; 1151 xpl = (struct sadb_x_policy *)request; 1152 1153 /* select direction */ 1154 switch (xpl->sadb_x_policy_dir) { 1155 case IPSEC_DIR_INBOUND: 1156 pcb_sp = &in6p->in6p_sp->sp_in; 1157 break; 1158 case IPSEC_DIR_OUTBOUND: 1159 pcb_sp = &in6p->in6p_sp->sp_out; 1160 break; 1161 default: 1162 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1163 xpl->sadb_x_policy_dir)); 1164 return EINVAL; 1165 } 1166 1167 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1168} 1169 1170int 1171ipsec6_get_policy(in6p, request, len, mp) 1172 struct in6pcb *in6p; 1173 caddr_t request; 1174 size_t len; 1175 struct mbuf **mp; 1176{ 1177 struct sadb_x_policy *xpl; 1178 struct secpolicy *pcb_sp; 1179 1180 /* sanity check. */ 1181 if (in6p == NULL || request == NULL || mp == NULL) 1182 return EINVAL; 1183 KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1184 if (len < sizeof(*xpl)) 1185 return EINVAL; 1186 xpl = (struct sadb_x_policy *)request; 1187 1188 /* select direction */ 1189 switch (xpl->sadb_x_policy_dir) { 1190 case IPSEC_DIR_INBOUND: 1191 pcb_sp = in6p->in6p_sp->sp_in; 1192 break; 1193 case IPSEC_DIR_OUTBOUND: 1194 pcb_sp = in6p->in6p_sp->sp_out; 1195 break; 1196 default: 1197 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1198 xpl->sadb_x_policy_dir)); 1199 return EINVAL; 1200 } 1201 1202 return ipsec_get_policy(pcb_sp, mp); 1203} 1204 1205int 1206ipsec6_delete_pcbpolicy(in6p) 1207 struct in6pcb *in6p; 1208{ 1209 KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1210 1211 if (in6p->in6p_sp == NULL) 1212 return 0; 1213 1214 if (in6p->in6p_sp->sp_in != NULL) 1215 KEY_FREESP(&in6p->in6p_sp->sp_in); 1216 1217 if (in6p->in6p_sp->sp_out != NULL) 1218 KEY_FREESP(&in6p->in6p_sp->sp_out); 1219 1220 ipsec_delpcbpolicy(in6p->in6p_sp); 1221 in6p->in6p_sp = NULL; 1222 1223 return 0; 1224} 1225#endif 1226 1227/* 1228 * return current level. 1229 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1230 */ 1231u_int 1232ipsec_get_reqlevel(isr) 1233 struct ipsecrequest *isr; 1234{ 1235 u_int level = 0; 1236 u_int esp_trans_deflev, esp_net_deflev; 1237 u_int ah_trans_deflev, ah_net_deflev; 1238 1239 KASSERT(isr != NULL && isr->sp != NULL, 1240 ("ipsec_get_reqlevel: null argument")); 1241 KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1242 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1243 isr->sp->spidx.src.sa.sa_family, 1244 isr->sp->spidx.dst.sa.sa_family)); 1245 1246/* XXX note that we have ipseclog() expanded here - code sync issue */ 1247#define IPSEC_CHECK_DEFAULT(lev) \ 1248 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1249 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1250 ? (ipsec_debug \ 1251 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1252 (lev), IPSEC_LEVEL_REQUIRE) \ 1253 : 0), \ 1254 (lev) = IPSEC_LEVEL_REQUIRE, \ 1255 (lev) \ 1256 : (lev)) 1257 1258 /* set default level */ 1259 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1260#ifdef INET 1261 case AF_INET: 1262 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1263 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1264 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1265 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1266 break; 1267#endif 1268#ifdef INET6 1269 case AF_INET6: 1270 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1271 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1272 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1273 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1274 break; 1275#endif /* INET6 */ 1276 default: 1277 panic("key_get_reqlevel: unknown af %u", 1278 isr->sp->spidx.src.sa.sa_family); 1279 } 1280 1281#undef IPSEC_CHECK_DEFAULT 1282 1283 /* set level */ 1284 switch (isr->level) { 1285 case IPSEC_LEVEL_DEFAULT: 1286 switch (isr->saidx.proto) { 1287 case IPPROTO_ESP: 1288 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1289 level = esp_net_deflev; 1290 else 1291 level = esp_trans_deflev; 1292 break; 1293 case IPPROTO_AH: 1294 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1295 level = ah_net_deflev; 1296 else 1297 level = ah_trans_deflev; 1298 case IPPROTO_IPCOMP: 1299 /* 1300 * we don't really care, as IPcomp document says that 1301 * we shouldn't compress small packets 1302 */ 1303 level = IPSEC_LEVEL_USE; 1304 break; 1305 default: 1306 panic("ipsec_get_reqlevel: " 1307 "Illegal protocol defined %u\n", 1308 isr->saidx.proto); 1309 } 1310 break; 1311 1312 case IPSEC_LEVEL_USE: 1313 case IPSEC_LEVEL_REQUIRE: 1314 level = isr->level; 1315 break; 1316 case IPSEC_LEVEL_UNIQUE: 1317 level = IPSEC_LEVEL_REQUIRE; 1318 break; 1319 1320 default: 1321 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n", 1322 isr->level); 1323 } 1324 1325 return level; 1326} 1327 1328/* 1329 * Check security policy requirements against the actual 1330 * packet contents. Return one if the packet should be 1331 * reject as "invalid"; otherwiser return zero to have the 1332 * packet treated as "valid". 1333 * 1334 * OUT: 1335 * 0: valid 1336 * 1: invalid 1337 */ 1338int 1339ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1340{ 1341 struct ipsecrequest *isr; 1342 int need_auth; 1343 1344 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1345 printf("ipsec_in_reject: using SP\n"); 1346 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 KASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1358 ("ipsec_in_reject: 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("ipsec_in_reject: ESP m_flags:%x\n", 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("ipsec_in_reject: ESP/AH m_flags:%x\n", 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("ipsec_in_reject: AH m_flags:%x\n", 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 KASSERT(m != NULL, ("ipsec4_in_reject_so: 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("ipsec_hdrsiz: using SP\n"); 1497 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 KASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1507 ("ipsec_hdrsiz: 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, "ipsec_hdrsiz: " 1537 "unknown AF %d in IPsec tunnel SA\n", 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 KASSERT(m != NULL, ("ipsec4_hdrsiz: 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("ipsec4_hdrsiz: size:%lu.\n", 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 KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1598 KASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1599 ("ipsec6_hdrsize: 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("ipsec6_hdrsiz: size:%lu.\n", (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#if 0 1641 SPLASSERT(net, "ipsec_chkreplay"); 1642#endif 1643 1644 KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1645 KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1646 1647 replay = sav->replay; 1648 1649 if (replay->wsize == 0) 1650 return 1; /* no need to check replay. */ 1651 1652 /* constant */ 1653 frlast = replay->wsize - 1; 1654 wsizeb = replay->wsize << 3; 1655 1656 /* sequence number of 0 is invalid */ 1657 if (seq == 0) 1658 return 0; 1659 1660 /* first time is always okay */ 1661 if (replay->count == 0) 1662 return 1; 1663 1664 if (seq > replay->lastseq) { 1665 /* larger sequences are okay */ 1666 return 1; 1667 } else { 1668 /* seq is equal or less than lastseq. */ 1669 diff = replay->lastseq - seq; 1670 1671 /* over range to check, i.e. too old or wrapped */ 1672 if (diff >= wsizeb) 1673 return 0; 1674 1675 fr = frlast - diff / 8; 1676 1677 /* this packet already seen ? */ 1678 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1679 return 0; 1680 1681 /* out of order but good */ 1682 return 1; 1683 } 1684} 1685 1686/* 1687 * check replay counter whether to update or not. 1688 * OUT: 0: OK 1689 * 1: NG 1690 */ 1691int 1692ipsec_updatereplay(seq, sav) 1693 u_int32_t seq; 1694 struct secasvar *sav; 1695{ 1696 struct secreplay *replay; 1697 u_int32_t diff; 1698 int fr; 1699 u_int32_t wsizeb; /* constant: bits of window size */ 1700 int frlast; /* constant: last frame */ 1701 1702#if 0 1703 SPLASSERT(net, "ipsec_updatereplay"); 1704#endif 1705 1706 KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 1707 KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 1708 1709 replay = sav->replay; 1710 1711 if (replay->wsize == 0) 1712 goto ok; /* no need to check replay. */ 1713 1714 /* constant */ 1715 frlast = replay->wsize - 1; 1716 wsizeb = replay->wsize << 3; 1717 1718 /* sequence number of 0 is invalid */ 1719 if (seq == 0) 1720 return 1; 1721 1722 /* first time */ 1723 if (replay->count == 0) { 1724 replay->lastseq = seq; 1725 bzero(replay->bitmap, replay->wsize); 1726 (replay->bitmap)[frlast] = 1; 1727 goto ok; 1728 } 1729 1730 if (seq > replay->lastseq) { 1731 /* seq is larger than lastseq. */ 1732 diff = seq - replay->lastseq; 1733 1734 /* new larger sequence number */ 1735 if (diff < wsizeb) { 1736 /* In window */ 1737 /* set bit for this packet */ 1738 vshiftl(replay->bitmap, diff, replay->wsize); 1739 (replay->bitmap)[frlast] |= 1; 1740 } else { 1741 /* this packet has a "way larger" */ 1742 bzero(replay->bitmap, replay->wsize); 1743 (replay->bitmap)[frlast] = 1; 1744 } 1745 replay->lastseq = seq; 1746 1747 /* larger is good */ 1748 } else { 1749 /* seq is equal or less than lastseq. */ 1750 diff = replay->lastseq - seq; 1751 1752 /* over range to check, i.e. too old or wrapped */ 1753 if (diff >= wsizeb) 1754 return 1; 1755 1756 fr = frlast - diff / 8; 1757 1758 /* this packet already seen ? */ 1759 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1760 return 1; 1761 1762 /* mark as seen */ 1763 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1764 1765 /* out of order but good */ 1766 } 1767 1768ok: 1769 if (replay->count == ~0) { 1770 1771 /* set overflow flag */ 1772 replay->overflow++; 1773 1774 /* don't increment, no more packets accepted */ 1775 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1776 return 1; 1777 1778 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 1779 replay->overflow, ipsec_logsastr(sav))); 1780 } 1781 1782 replay->count++; 1783 1784 return 0; 1785} 1786 1787/* 1788 * shift variable length bunffer to left. 1789 * IN: bitmap: pointer to the buffer 1790 * nbit: the number of to shift. 1791 * wsize: buffer size (bytes). 1792 */ 1793static void 1794vshiftl(bitmap, nbit, wsize) 1795 unsigned char *bitmap; 1796 int nbit, wsize; 1797{ 1798 int s, j, i; 1799 unsigned char over; 1800 1801 for (j = 0; j < nbit; j += 8) { 1802 s = (nbit - j < 8) ? (nbit - j): 8; 1803 bitmap[0] <<= s; 1804 for (i = 1; i < wsize; i++) { 1805 over = (bitmap[i] >> (8 - s)); 1806 bitmap[i] <<= s; 1807 bitmap[i-1] |= over; 1808 } 1809 } 1810 1811 return; 1812} 1813 1814/* Return a printable string for the IPv4 address. */ 1815static char * 1816inet_ntoa4(struct in_addr ina) 1817{ 1818 static char buf[4][4 * sizeof "123" + 4]; 1819 unsigned char *ucp = (unsigned char *) &ina; 1820 static int i = 3; 1821 1822 i = (i + 1) % 4; 1823 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1824 ucp[2] & 0xff, ucp[3] & 0xff); 1825 return (buf[i]); 1826} 1827 1828/* Return a printable string for the address. */ 1829char * 1830ipsec_address(union sockaddr_union* sa) 1831{ 1832 switch (sa->sa.sa_family) { 1833#if INET 1834 case AF_INET: 1835 return inet_ntoa4(sa->sin.sin_addr); 1836#endif /* INET */ 1837 1838#if INET6 1839 case AF_INET6: 1840 return ip6_sprintf(&sa->sin6.sin6_addr); 1841#endif /* INET6 */ 1842 1843 default: 1844 return "(unknown address family)"; 1845 } 1846} 1847 1848const char * 1849ipsec_logsastr(sav) 1850 struct secasvar *sav; 1851{ 1852 static char buf[256]; 1853 char *p; 1854 struct secasindex *saidx = &sav->sah->saidx; 1855 1856 KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1857 ("ipsec_logsastr: address family mismatch")); 1858 1859 p = buf; 1860 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1861 while (p && *p) 1862 p++; 1863 /* NB: only use ipsec_address on one address at a time */ 1864 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1865 ipsec_address(&saidx->src)); 1866 while (p && *p) 1867 p++; 1868 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1869 ipsec_address(&saidx->dst)); 1870 1871 return buf; 1872} 1873 1874void 1875ipsec_dumpmbuf(m) 1876 struct mbuf *m; 1877{ 1878 int totlen; 1879 int i; 1880 u_char *p; 1881 1882 totlen = 0; 1883 printf("---\n"); 1884 while (m) { 1885 p = mtod(m, u_char *); 1886 for (i = 0; i < m->m_len; i++) { 1887 printf("%02x ", p[i]); 1888 totlen++; 1889 if (totlen % 16 == 0) 1890 printf("\n"); 1891 } 1892 m = m->m_next; 1893 } 1894 if (totlen % 16 != 0) 1895 printf("\n"); 1896 printf("---\n"); 1897} 1898 1899/* XXX this stuff doesn't belong here... */ 1900 1901static struct xformsw* xforms = NULL; 1902 1903/* 1904 * Register a transform; typically at system startup. 1905 */ 1906void 1907xform_register(struct xformsw* xsp) 1908{ 1909 xsp->xf_next = xforms; 1910 xforms = xsp; 1911} 1912 1913/* 1914 * Initialize transform support in an sav. 1915 */ 1916int 1917xform_init(struct secasvar *sav, int xftype) 1918{ 1919 struct xformsw *xsp; 1920 1921 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1922 if (xsp->xf_type == xftype) 1923 return (*xsp->xf_init)(sav, xsp); 1924 return EINVAL; 1925} 1926