1 /* $FreeBSD$ */ 2 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * IPsec controller part. 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/domain.h> 46 #include <sys/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/errno.h> 50 #include <sys/time.h> 51 #include <sys/kernel.h> 52 #include <sys/syslog.h> 53 #include <sys/sysctl.h> 54 #include <sys/proc.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/ip.h> 62 #include <netinet/ip_var.h> 63 #include <netinet/in_var.h> 64 #include <netinet/udp.h> 65 #include <netinet/udp_var.h> 66 #include <netinet/tcp.h> 67 #include <netinet/udp.h> 68 69 #include <netinet/ip6.h> 70 #ifdef INET6 71 #include <netinet6/ip6_var.h> 72 #endif 73 #include <netinet/in_pcb.h> 74 #ifdef INET6 75 #include <netinet/icmp6.h> 76 #endif 77 78 #include <netipsec/ipsec.h> 79 #ifdef INET6 80 #include <netipsec/ipsec6.h> 81 #endif 82 #include <netipsec/ah_var.h> 83 #include <netipsec/esp_var.h> 84 #include <netipsec/ipcomp.h> /*XXX*/ 85 #include <netipsec/ipcomp_var.h> 86 87 #include <netipsec/key.h> 88 #include <netipsec/keydb.h> 89 #include <netipsec/key_debug.h> 90 91 #include <netipsec/xform.h> 92 93 #include <machine/in_cksum.h> 94 95 #ifdef IPSEC_DEBUG 96 int ipsec_debug = 1; 97 #else 98 int ipsec_debug = 0; 99 #endif 100 101 /* NB: name changed so netstat doesn't use it */ 102 struct newipsecstat newipsecstat; 103 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 104 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 105 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 106 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 107 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 108 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 109 struct secpolicy ip4_def_policy; 110 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 111 int ip4_esp_randpad = -1; 112 /* 113 * Crypto support requirements: 114 * 115 * 1 require hardware support 116 * -1 require software support 117 * 0 take anything 118 */ 119 int crypto_support = 0; 120 121 SYSCTL_DECL(_net_inet_ipsec); 122 123 /* net.inet.ipsec */ 124 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 125 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 126 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 127 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 129 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 131 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 133 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 135 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 137 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 139 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 141 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 143 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 145 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 146 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 147 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 148 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 149 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 150 151 #ifdef INET6 152 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 153 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 154 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 155 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 156 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 157 int ip6_esp_randpad = -1; 158 159 SYSCTL_DECL(_net_inet6_ipsec6); 160 161 /* net.inet6.ipsec6 */ 162 #ifdef COMPAT_KAME 163 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 164 0,0, compat_ipsecstats_sysctl, "S", ""); 165 #endif /* COMPAT_KAME */ 166 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 167 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 168 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 169 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 170 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 171 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 173 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 175 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 177 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 179 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 181 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 182 #endif /* INET6 */ 183 184 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 185 #ifdef INET6 186 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 187 #endif 188 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 189 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 190 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 191 #ifdef INET6 192 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 193 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 194 #endif 195 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 196 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 197 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 198 int optname, caddr_t request, size_t len, int priv)); 199 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 200 static void vshiftl __P((unsigned char *, int, int)); 201 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 202 203 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 204 205 /* 206 * Return a held reference to the default SP. 207 */ 208 static struct secpolicy * 209 key_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 */ 245 struct secpolicy * 246 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 247 { 248 struct secpolicy *sp; 249 250 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 251 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 252 ("invalid direction %u", dir)); 253 254 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 255 if (sp == NULL) /*XXX????*/ 256 sp = KEY_ALLOCSP_DEFAULT(); 257 IPSEC_ASSERT(sp != NULL, ("null SP")); 258 return sp; 259 } 260 261 /* 262 * For OUTBOUND packet having a socket. Searching SPD for packet, 263 * and return a pointer to SP. 264 * OUT: NULL: no apropreate SP found, the following value is set to error. 265 * 0 : bypass 266 * EACCES : discard packet. 267 * ENOENT : ipsec_acquire() in progress, maybe. 268 * others : error occured. 269 * others: a pointer to SP 270 * 271 * NOTE: IPv6 mapped adddress concern is implemented here. 272 */ 273 struct secpolicy * 274 ipsec_getpolicybysock(m, dir, inp, error) 275 struct mbuf *m; 276 u_int dir; 277 struct inpcb *inp; 278 int *error; 279 { 280 struct inpcbpolicy *pcbsp = NULL; 281 struct secpolicy *currsp = NULL; /* policy on socket */ 282 struct secpolicy *sp; 283 284 IPSEC_ASSERT(m != NULL, ("null mbuf")); 285 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 286 IPSEC_ASSERT(error != NULL, ("null error")); 287 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 288 ("invalid direction %u", dir)); 289 290 /* set spidx in pcb */ 291 if (inp->inp_vflag & INP_IPV6PROTO) { 292 #ifdef INET6 293 *error = ipsec6_setspidx_in6pcb(m, inp); 294 pcbsp = inp->in6p_sp; 295 #else 296 *error = EINVAL; /* should not happen */ 297 #endif 298 } else { 299 *error = ipsec4_setspidx_inpcb(m, inp); 300 pcbsp = inp->inp_sp; 301 } 302 if (*error) 303 return NULL; 304 305 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 306 switch (dir) { 307 case IPSEC_DIR_INBOUND: 308 currsp = pcbsp->sp_in; 309 break; 310 case IPSEC_DIR_OUTBOUND: 311 currsp = pcbsp->sp_out; 312 break; 313 } 314 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 315 316 if (pcbsp->priv) { /* when privilieged socket */ 317 switch (currsp->policy) { 318 case IPSEC_POLICY_BYPASS: 319 case IPSEC_POLICY_IPSEC: 320 currsp->refcnt++; 321 sp = currsp; 322 break; 323 324 case IPSEC_POLICY_ENTRUST: 325 /* look for a policy in SPD */ 326 sp = KEY_ALLOCSP(&currsp->spidx, dir); 327 if (sp == NULL) /* no SP found */ 328 sp = KEY_ALLOCSP_DEFAULT(); 329 break; 330 331 default: 332 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 333 __func__, currsp->policy)); 334 *error = EINVAL; 335 return NULL; 336 } 337 } else { /* unpriv, SPD has policy */ 338 sp = KEY_ALLOCSP(&currsp->spidx, dir); 339 if (sp == NULL) { /* no SP found */ 340 switch (currsp->policy) { 341 case IPSEC_POLICY_BYPASS: 342 ipseclog((LOG_ERR, "%s: Illegal policy for " 343 "non-priviliged defined %d\n", 344 __func__, currsp->policy)); 345 *error = EINVAL; 346 return NULL; 347 348 case IPSEC_POLICY_ENTRUST: 349 sp = KEY_ALLOCSP_DEFAULT(); 350 break; 351 352 case IPSEC_POLICY_IPSEC: 353 currsp->refcnt++; 354 sp = currsp; 355 break; 356 357 default: 358 ipseclog((LOG_ERR, "%s: Invalid policy for " 359 "PCB %d\n", __func__, currsp->policy)); 360 *error = EINVAL; 361 return NULL; 362 } 363 } 364 } 365 IPSEC_ASSERT(sp != NULL, 366 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 367 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 368 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 369 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 370 return sp; 371 } 372 373 /* 374 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 375 * and return a pointer to SP. 376 * OUT: positive: a pointer to the entry for security policy leaf matched. 377 * NULL: no apropreate SP found, the following value is set to error. 378 * 0 : bypass 379 * EACCES : discard packet. 380 * ENOENT : ipsec_acquire() in progress, maybe. 381 * others : error occured. 382 */ 383 struct secpolicy * 384 ipsec_getpolicybyaddr(m, dir, flag, error) 385 struct mbuf *m; 386 u_int dir; 387 int flag; 388 int *error; 389 { 390 struct secpolicyindex spidx; 391 struct secpolicy *sp; 392 393 IPSEC_ASSERT(m != NULL, ("null mbuf")); 394 IPSEC_ASSERT(error != NULL, ("null error")); 395 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 396 ("invalid direction %u", dir)); 397 398 sp = NULL; 399 if (key_havesp(dir)) { 400 /* Make an index to look for a policy. */ 401 *error = ipsec_setspidx(m, &spidx, 402 (flag & IP_FORWARDING) ? 0 : 1); 403 if (*error != 0) { 404 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 405 __func__, dir, flag)); 406 bzero(&spidx, sizeof (spidx)); 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 } 418 419 struct secpolicy * 420 ipsec4_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 } 464 465 static int 466 ipsec4_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 492 static int 493 ipsec6_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; 521 522 bad: 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 */ 534 static int 535 ipsec_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 } 610 611 static void 612 ipsec4_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 (m->m_pkthdr.len > off + sizeof(ip6e)) 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 } 687 done: 688 spidx->ul_proto = IPSEC_ULPROTO_ANY; 689 done_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 */ 695 static int 696 ipsec4_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 727 static void 728 ipsec6_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 */ 784 static int 785 ipsec6_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 825 826 static void 827 ipsec_delpcbpolicy(p) 828 struct inpcbpolicy *p; 829 { 830 free(p, M_IPSEC_INPCB); 831 } 832 833 /* initialize policy in PCB */ 834 int 835 ipsec_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 */ 875 int 876 ipsec_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 } 899 900 struct ipsecrequest * 901 ipsec_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 } 910 911 void 912 ipsec_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 */ 919 static struct secpolicy * 920 ipsec_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; 963 964 fail: 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. */ 974 static int 975 ipsec_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 1023 static int 1024 ipsec_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 1046 int 1047 ipsec4_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 1081 int 1082 ipsec4_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 */ 1117 int 1118 ipsec4_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 1139 int 1140 ipsec6_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 1174 int 1175 ipsec6_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 1209 int 1210 ipsec6_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 */ 1235 u_int 1236 ipsec_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 case IPPROTO_IPCOMP: 1302 /* 1303 * we don't really care, as IPcomp document says that 1304 * we shouldn't compress small packets 1305 */ 1306 level = IPSEC_LEVEL_USE; 1307 break; 1308 default: 1309 panic("%s: Illegal protocol defined %u\n", __func__, 1310 isr->saidx.proto); 1311 } 1312 break; 1313 1314 case IPSEC_LEVEL_USE: 1315 case IPSEC_LEVEL_REQUIRE: 1316 level = isr->level; 1317 break; 1318 case IPSEC_LEVEL_UNIQUE: 1319 level = IPSEC_LEVEL_REQUIRE; 1320 break; 1321 1322 default: 1323 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1324 } 1325 1326 return level; 1327 } 1328 1329 /* 1330 * Check security policy requirements against the actual 1331 * packet contents. Return one if the packet should be 1332 * reject as "invalid"; otherwiser return zero to have the 1333 * packet treated as "valid". 1334 * 1335 * OUT: 1336 * 0: valid 1337 * 1: invalid 1338 */ 1339 int 1340 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1341 { 1342 struct ipsecrequest *isr; 1343 int need_auth; 1344 1345 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1346 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1347 1348 /* check policy */ 1349 switch (sp->policy) { 1350 case IPSEC_POLICY_DISCARD: 1351 return 1; 1352 case IPSEC_POLICY_BYPASS: 1353 case IPSEC_POLICY_NONE: 1354 return 0; 1355 } 1356 1357 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1358 ("invalid policy %u", sp->policy)); 1359 1360 /* XXX should compare policy against ipsec header history */ 1361 1362 need_auth = 0; 1363 for (isr = sp->req; isr != NULL; isr = isr->next) { 1364 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1365 continue; 1366 switch (isr->saidx.proto) { 1367 case IPPROTO_ESP: 1368 if ((m->m_flags & M_DECRYPTED) == 0) { 1369 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1370 printf("%s: ESP m_flags:%x\n", __func__, 1371 m->m_flags)); 1372 return 1; 1373 } 1374 1375 if (!need_auth && 1376 isr->sav != NULL && 1377 isr->sav->tdb_authalgxform != NULL && 1378 (m->m_flags & M_AUTHIPDGM) == 0) { 1379 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1380 printf("%s: ESP/AH m_flags:%x\n", __func__, 1381 m->m_flags)); 1382 return 1; 1383 } 1384 break; 1385 case IPPROTO_AH: 1386 need_auth = 1; 1387 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1388 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1389 printf("%s: AH m_flags:%x\n", __func__, 1390 m->m_flags)); 1391 return 1; 1392 } 1393 break; 1394 case IPPROTO_IPCOMP: 1395 /* 1396 * we don't really care, as IPcomp document 1397 * says that we shouldn't compress small 1398 * packets, IPComp policy should always be 1399 * treated as being in "use" level. 1400 */ 1401 break; 1402 } 1403 } 1404 return 0; /* valid */ 1405 } 1406 1407 /* 1408 * Check AH/ESP integrity. 1409 * This function is called from tcp_input(), udp_input(), 1410 * and {ah,esp}4_input for tunnel mode 1411 */ 1412 int 1413 ipsec4_in_reject(m, inp) 1414 struct mbuf *m; 1415 struct inpcb *inp; 1416 { 1417 struct secpolicy *sp; 1418 int error; 1419 int result; 1420 1421 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1422 1423 /* get SP for this packet. 1424 * When we are called from ip_forward(), we call 1425 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1426 */ 1427 if (inp == NULL) 1428 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1429 else 1430 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1431 1432 if (sp != NULL) { 1433 result = ipsec_in_reject(sp, m); 1434 if (result) 1435 newipsecstat.ips_in_polvio++; 1436 KEY_FREESP(&sp); 1437 } else { 1438 result = 0; /* XXX should be panic ? 1439 * -> No, there may be error. */ 1440 } 1441 return result; 1442 } 1443 1444 #ifdef INET6 1445 /* 1446 * Check AH/ESP integrity. 1447 * This function is called from tcp6_input(), udp6_input(), 1448 * and {ah,esp}6_input for tunnel mode 1449 */ 1450 int 1451 ipsec6_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 */ 1489 static size_t 1490 ipsec_hdrsiz(struct secpolicy *sp) 1491 { 1492 struct ipsecrequest *isr; 1493 size_t siz; 1494 1495 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1496 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1497 1498 switch (sp->policy) { 1499 case IPSEC_POLICY_DISCARD: 1500 case IPSEC_POLICY_BYPASS: 1501 case IPSEC_POLICY_NONE: 1502 return 0; 1503 } 1504 1505 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1506 ("invalid policy %u", sp->policy)); 1507 1508 siz = 0; 1509 for (isr = sp->req; isr != NULL; isr = isr->next) { 1510 size_t clen = 0; 1511 1512 switch (isr->saidx.proto) { 1513 case IPPROTO_ESP: 1514 clen = esp_hdrsiz(isr->sav); 1515 break; 1516 case IPPROTO_AH: 1517 clen = ah_hdrsiz(isr->sav); 1518 break; 1519 case IPPROTO_IPCOMP: 1520 clen = sizeof(struct ipcomp); 1521 break; 1522 } 1523 1524 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1525 switch (isr->saidx.dst.sa.sa_family) { 1526 case AF_INET: 1527 clen += sizeof(struct ip); 1528 break; 1529 #ifdef INET6 1530 case AF_INET6: 1531 clen += sizeof(struct ip6_hdr); 1532 break; 1533 #endif 1534 default: 1535 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1536 "IPsec tunnel SA\n", __func__, 1537 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1538 break; 1539 } 1540 } 1541 siz += clen; 1542 } 1543 1544 return siz; 1545 } 1546 1547 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1548 size_t 1549 ipsec4_hdrsiz(m, dir, inp) 1550 struct mbuf *m; 1551 u_int dir; 1552 struct inpcb *inp; 1553 { 1554 struct secpolicy *sp; 1555 int error; 1556 size_t size; 1557 1558 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1559 1560 /* get SP for this packet. 1561 * When we are called from ip_forward(), we call 1562 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1563 */ 1564 if (inp == NULL) 1565 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1566 else 1567 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1568 1569 if (sp != NULL) { 1570 size = ipsec_hdrsiz(sp); 1571 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1572 printf("%s: size:%lu.\n", __func__, 1573 (unsigned long)size)); 1574 1575 KEY_FREESP(&sp); 1576 } else { 1577 size = 0; /* XXX should be panic ? */ 1578 } 1579 return size; 1580 } 1581 1582 #ifdef INET6 1583 /* This function is called from ipsec6_hdrsize_tcp(), 1584 * and maybe from ip6_forward.() 1585 */ 1586 size_t 1587 ipsec6_hdrsiz(m, dir, in6p) 1588 struct mbuf *m; 1589 u_int dir; 1590 struct in6pcb *in6p; 1591 { 1592 struct secpolicy *sp; 1593 int error; 1594 size_t size; 1595 1596 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1597 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1598 ("socket w/o inpcb")); 1599 1600 /* get SP for this packet */ 1601 /* XXX Is it right to call with IP_FORWARDING. */ 1602 if (in6p == NULL) 1603 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1604 else 1605 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1606 1607 if (sp == NULL) 1608 return 0; 1609 size = ipsec_hdrsiz(sp); 1610 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1611 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1612 KEY_FREESP(&sp); 1613 1614 return size; 1615 } 1616 #endif /*INET6*/ 1617 1618 /* 1619 * Check the variable replay window. 1620 * ipsec_chkreplay() performs replay check before ICV verification. 1621 * ipsec_updatereplay() updates replay bitmap. This must be called after 1622 * ICV verification (it also performs replay check, which is usually done 1623 * beforehand). 1624 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1625 * 1626 * based on RFC 2401. 1627 */ 1628 int 1629 ipsec_chkreplay(seq, sav) 1630 u_int32_t seq; 1631 struct secasvar *sav; 1632 { 1633 const struct secreplay *replay; 1634 u_int32_t diff; 1635 int fr; 1636 u_int32_t wsizeb; /* constant: bits of window size */ 1637 int frlast; /* constant: last frame */ 1638 1639 IPSEC_SPLASSERT_SOFTNET(__func__); 1640 1641 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1642 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1643 1644 replay = sav->replay; 1645 1646 if (replay->wsize == 0) 1647 return 1; /* no need to check replay. */ 1648 1649 /* constant */ 1650 frlast = replay->wsize - 1; 1651 wsizeb = replay->wsize << 3; 1652 1653 /* sequence number of 0 is invalid */ 1654 if (seq == 0) 1655 return 0; 1656 1657 /* first time is always okay */ 1658 if (replay->count == 0) 1659 return 1; 1660 1661 if (seq > replay->lastseq) { 1662 /* larger sequences are okay */ 1663 return 1; 1664 } else { 1665 /* seq is equal or less than lastseq. */ 1666 diff = replay->lastseq - seq; 1667 1668 /* over range to check, i.e. too old or wrapped */ 1669 if (diff >= wsizeb) 1670 return 0; 1671 1672 fr = frlast - diff / 8; 1673 1674 /* this packet already seen ? */ 1675 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1676 return 0; 1677 1678 /* out of order but good */ 1679 return 1; 1680 } 1681 } 1682 1683 /* 1684 * check replay counter whether to update or not. 1685 * OUT: 0: OK 1686 * 1: NG 1687 */ 1688 int 1689 ipsec_updatereplay(seq, sav) 1690 u_int32_t seq; 1691 struct secasvar *sav; 1692 { 1693 struct secreplay *replay; 1694 u_int32_t diff; 1695 int fr; 1696 u_int32_t wsizeb; /* constant: bits of window size */ 1697 int frlast; /* constant: last frame */ 1698 1699 IPSEC_SPLASSERT_SOFTNET(__func__); 1700 1701 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1702 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1703 1704 replay = sav->replay; 1705 1706 if (replay->wsize == 0) 1707 goto ok; /* no need to check replay. */ 1708 1709 /* constant */ 1710 frlast = replay->wsize - 1; 1711 wsizeb = replay->wsize << 3; 1712 1713 /* sequence number of 0 is invalid */ 1714 if (seq == 0) 1715 return 1; 1716 1717 /* first time */ 1718 if (replay->count == 0) { 1719 replay->lastseq = seq; 1720 bzero(replay->bitmap, replay->wsize); 1721 (replay->bitmap)[frlast] = 1; 1722 goto ok; 1723 } 1724 1725 if (seq > replay->lastseq) { 1726 /* seq is larger than lastseq. */ 1727 diff = seq - replay->lastseq; 1728 1729 /* new larger sequence number */ 1730 if (diff < wsizeb) { 1731 /* In window */ 1732 /* set bit for this packet */ 1733 vshiftl(replay->bitmap, diff, replay->wsize); 1734 (replay->bitmap)[frlast] |= 1; 1735 } else { 1736 /* this packet has a "way larger" */ 1737 bzero(replay->bitmap, replay->wsize); 1738 (replay->bitmap)[frlast] = 1; 1739 } 1740 replay->lastseq = seq; 1741 1742 /* larger is good */ 1743 } else { 1744 /* seq is equal or less than lastseq. */ 1745 diff = replay->lastseq - seq; 1746 1747 /* over range to check, i.e. too old or wrapped */ 1748 if (diff >= wsizeb) 1749 return 1; 1750 1751 fr = frlast - diff / 8; 1752 1753 /* this packet already seen ? */ 1754 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1755 return 1; 1756 1757 /* mark as seen */ 1758 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1759 1760 /* out of order but good */ 1761 } 1762 1763 ok: 1764 if (replay->count == ~0) { 1765 1766 /* set overflow flag */ 1767 replay->overflow++; 1768 1769 /* don't increment, no more packets accepted */ 1770 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1771 return 1; 1772 1773 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1774 __func__, replay->overflow, ipsec_logsastr(sav))); 1775 } 1776 1777 replay->count++; 1778 1779 return 0; 1780 } 1781 1782 /* 1783 * shift variable length bunffer to left. 1784 * IN: bitmap: pointer to the buffer 1785 * nbit: the number of to shift. 1786 * wsize: buffer size (bytes). 1787 */ 1788 static void 1789 vshiftl(bitmap, nbit, wsize) 1790 unsigned char *bitmap; 1791 int nbit, wsize; 1792 { 1793 int s, j, i; 1794 unsigned char over; 1795 1796 for (j = 0; j < nbit; j += 8) { 1797 s = (nbit - j < 8) ? (nbit - j): 8; 1798 bitmap[0] <<= s; 1799 for (i = 1; i < wsize; i++) { 1800 over = (bitmap[i] >> (8 - s)); 1801 bitmap[i] <<= s; 1802 bitmap[i-1] |= over; 1803 } 1804 } 1805 1806 return; 1807 } 1808 1809 /* Return a printable string for the IPv4 address. */ 1810 static char * 1811 inet_ntoa4(struct in_addr ina) 1812 { 1813 static char buf[4][4 * sizeof "123" + 4]; 1814 unsigned char *ucp = (unsigned char *) &ina; 1815 static int i = 3; 1816 1817 i = (i + 1) % 4; 1818 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1819 ucp[2] & 0xff, ucp[3] & 0xff); 1820 return (buf[i]); 1821 } 1822 1823 /* Return a printable string for the address. */ 1824 char * 1825 ipsec_address(union sockaddr_union* sa) 1826 { 1827 switch (sa->sa.sa_family) { 1828 #if INET 1829 case AF_INET: 1830 return inet_ntoa4(sa->sin.sin_addr); 1831 #endif /* INET */ 1832 1833 #if INET6 1834 case AF_INET6: 1835 return ip6_sprintf(&sa->sin6.sin6_addr); 1836 #endif /* INET6 */ 1837 1838 default: 1839 return "(unknown address family)"; 1840 } 1841 } 1842 1843 const char * 1844 ipsec_logsastr(sav) 1845 struct secasvar *sav; 1846 { 1847 static char buf[256]; 1848 char *p; 1849 struct secasindex *saidx = &sav->sah->saidx; 1850 1851 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1852 ("address family mismatch")); 1853 1854 p = buf; 1855 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1856 while (p && *p) 1857 p++; 1858 /* NB: only use ipsec_address on one address at a time */ 1859 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1860 ipsec_address(&saidx->src)); 1861 while (p && *p) 1862 p++; 1863 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1864 ipsec_address(&saidx->dst)); 1865 1866 return buf; 1867 } 1868 1869 void 1870 ipsec_dumpmbuf(m) 1871 struct mbuf *m; 1872 { 1873 int totlen; 1874 int i; 1875 u_char *p; 1876 1877 totlen = 0; 1878 printf("---\n"); 1879 while (m) { 1880 p = mtod(m, u_char *); 1881 for (i = 0; i < m->m_len; i++) { 1882 printf("%02x ", p[i]); 1883 totlen++; 1884 if (totlen % 16 == 0) 1885 printf("\n"); 1886 } 1887 m = m->m_next; 1888 } 1889 if (totlen % 16 != 0) 1890 printf("\n"); 1891 printf("---\n"); 1892 } 1893 1894 /* XXX this stuff doesn't belong here... */ 1895 1896 static struct xformsw* xforms = NULL; 1897 1898 /* 1899 * Register a transform; typically at system startup. 1900 */ 1901 void 1902 xform_register(struct xformsw* xsp) 1903 { 1904 xsp->xf_next = xforms; 1905 xforms = xsp; 1906 } 1907 1908 /* 1909 * Initialize transform support in an sav. 1910 */ 1911 int 1912 xform_init(struct secasvar *sav, int xftype) 1913 { 1914 struct xformsw *xsp; 1915 1916 if (sav->tdb_xform != NULL) /* previously initialized */ 1917 return 0; 1918 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1919 if (xsp->xf_type == xftype) 1920 return (*xsp->xf_init)(sav, xsp); 1921 return EINVAL; 1922 } 1923