Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/priv.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/kernel.h> 53 #include <sys/syslog.h> 54 #include <sys/sysctl.h> 55 #include <sys/proc.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 #include <net/vnet.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #include <netinet/ip_var.h> 65 #include <netinet/in_var.h> 66 #include <netinet/udp.h> 67 #include <netinet/udp_var.h> 68 #include <netinet/tcp.h> 69 #include <netinet/udp.h> 70 71 #include <netinet/ip6.h> 72 #ifdef INET6 73 #include <netinet6/ip6_var.h> 74 #endif 75 #include <netinet/in_pcb.h> 76 #ifdef INET6 77 #include <netinet/icmp6.h> 78 #endif 79 80 #include <sys/types.h> 81 #include <netipsec/ipsec.h> 82 #ifdef INET6 83 #include <netipsec/ipsec6.h> 84 #endif 85 #include <netipsec/ah_var.h> 86 #include <netipsec/esp_var.h> 87 #include <netipsec/ipcomp.h> /*XXX*/ 88 #include <netipsec/ipcomp_var.h> 89 90 #include <netipsec/key.h> 91 #include <netipsec/keydb.h> 92 #include <netipsec/key_debug.h> 93 94 #include <netipsec/xform.h> 95 96 #include <machine/in_cksum.h> 97 98 #include <opencrypto/cryptodev.h> 99 100 #ifdef IPSEC_DEBUG 101 VNET_DEFINE(int, ipsec_debug) = 1; 102 #else 103 VNET_DEFINE(int, ipsec_debug) = 0; 104 #endif 105 106 /* NB: name changed so netstat doesn't use it. */ 107 VNET_DEFINE(struct ipsecstat, ipsec4stat); 108 VNET_DEFINE(int, ip4_ah_offsetmask) = 0; /* maybe IP_DF? */ 109 /* DF bit on encap. 0: clear 1: set 2: copy */ 110 VNET_DEFINE(int, ip4_ipsec_dfbit) = 0; 111 VNET_DEFINE(int, ip4_esp_trans_deflev) = IPSEC_LEVEL_USE; 112 VNET_DEFINE(int, ip4_esp_net_deflev) = IPSEC_LEVEL_USE; 113 VNET_DEFINE(int, ip4_ah_trans_deflev) = IPSEC_LEVEL_USE; 114 VNET_DEFINE(int, ip4_ah_net_deflev) = IPSEC_LEVEL_USE; 115 VNET_DEFINE(struct secpolicy, ip4_def_policy); 116 /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 117 VNET_DEFINE(int, ip4_ipsec_ecn) = 0; 118 VNET_DEFINE(int, ip4_esp_randpad) = -1; 119 120 /* 121 * Crypto support requirements: 122 * 123 * 1 require hardware support 124 * -1 require software support 125 * 0 take anything 126 */ 127 VNET_DEFINE(int, crypto_support) = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 128 129 FEATURE(ipsec, "Internet Protocol Security (IPsec)"); 130 #ifdef IPSEC_NAT_T 131 FEATURE(ipsec_natt, "UDP Encapsulation of IPsec ESP Packets ('NAT-T')"); 132 #endif 133 134 SYSCTL_DECL(_net_inet_ipsec); 135 136 /* net.inet.ipsec */ 137 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, def_policy, 138 CTLFLAG_RW, &VNET_NAME(ip4_def_policy).policy, 0, 139 "IPsec default policy."); 140 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 141 CTLFLAG_RW, &VNET_NAME(ip4_esp_trans_deflev), 0, 142 "Default ESP transport mode level"); 143 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 144 CTLFLAG_RW, &VNET_NAME(ip4_esp_net_deflev), 0, 145 "Default ESP tunnel mode level."); 146 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 147 CTLFLAG_RW, &VNET_NAME(ip4_ah_trans_deflev), 0, 148 "AH transfer mode default level."); 149 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 150 CTLFLAG_RW, &VNET_NAME(ip4_ah_net_deflev), 0, 151 "AH tunnel mode default level."); 152 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, ah_cleartos, 153 CTLFLAG_RW, &VNET_NAME(ah_cleartos), 0, 154 "If set clear type-of-service field when doing AH computation."); 155 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, ah_offsetmask, 156 CTLFLAG_RW, &VNET_NAME(ip4_ah_offsetmask), 0, 157 "If not set clear offset field mask when doing AH computation."); 158 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DFBIT, dfbit, 159 CTLFLAG_RW, &VNET_NAME(ip4_ipsec_dfbit), 0, 160 "Do not fragment bit on encap."); 161 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_ECN, ecn, 162 CTLFLAG_RW, &VNET_NAME(ip4_ipsec_ecn), 0, 163 "Explicit Congestion Notification handling."); 164 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug, 165 CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0, 166 "Enable IPsec debugging output when set."); 167 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, crypto_support, 168 CTLFLAG_RW, &VNET_NAME(crypto_support), 0, 169 "Crypto driver selection."); 170 SYSCTL_VNET_STRUCT(_net_inet_ipsec, OID_AUTO, ipsecstats, 171 CTLFLAG_RD, &VNET_NAME(ipsec4stat), ipsecstat, 172 "IPsec IPv4 statistics."); 173 174 #ifdef REGRESSION 175 /* 176 * When set to 1, IPsec will send packets with the same sequence number. 177 * This allows to verify if the other side has proper replay attacks detection. 178 */ 179 VNET_DEFINE(int, ipsec_replay) = 0; 180 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, test_replay, 181 CTLFLAG_RW, &VNET_NAME(ipsec_replay), 0, 182 "Emulate replay attack"); 183 /* 184 * When set 1, IPsec will send packets with corrupted HMAC. 185 * This allows to verify if the other side properly detects modified packets. 186 */ 187 VNET_DEFINE(int, ipsec_integrity) = 0; 188 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, test_integrity, 189 CTLFLAG_RW, &VNET_NAME(ipsec_integrity), 0, 190 "Emulate man-in-the-middle attack"); 191 #endif 192 193 #ifdef INET6 194 VNET_DEFINE(struct ipsecstat, ipsec6stat); 195 VNET_DEFINE(int, ip6_esp_trans_deflev) = IPSEC_LEVEL_USE; 196 VNET_DEFINE(int, ip6_esp_net_deflev) = IPSEC_LEVEL_USE; 197 VNET_DEFINE(int, ip6_ah_trans_deflev) = IPSEC_LEVEL_USE; 198 VNET_DEFINE(int, ip6_ah_net_deflev) = IPSEC_LEVEL_USE; 199 VNET_DEFINE(int, ip6_ipsec_ecn) = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 200 201 SYSCTL_DECL(_net_inet6_ipsec6); 202 203 /* net.inet6.ipsec6 */ 204 #ifdef COMPAT_KAME 205 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 206 0, 0, compat_ipsecstats_sysctl, "S", "IPsec IPv6 statistics."); 207 #endif /* COMPAT_KAME */ 208 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, def_policy, CTLFLAG_RW, 209 &VNET_NAME(ip4_def_policy).policy, 0, 210 "IPsec default policy."); 211 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, 212 esp_trans_deflev, CTLFLAG_RW, &VNET_NAME(ip6_esp_trans_deflev), 0, 213 "Default ESP transport mode level."); 214 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, 215 esp_net_deflev, CTLFLAG_RW, &VNET_NAME(ip6_esp_net_deflev), 0, 216 "Default ESP tunnel mode level."); 217 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, 218 ah_trans_deflev, CTLFLAG_RW, &VNET_NAME(ip6_ah_trans_deflev), 0, 219 "AH transfer mode default level."); 220 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, 221 ah_net_deflev, CTLFLAG_RW, &VNET_NAME(ip6_ah_net_deflev), 0, 222 "AH tunnel mode default level."); 223 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 224 ecn, CTLFLAG_RW, &VNET_NAME(ip6_ipsec_ecn), 0, 225 "Explicit Congestion Notification handling."); 226 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug, CTLFLAG_RW, 227 &VNET_NAME(ipsec_debug), 0, 228 "Enable IPsec debugging output when set."); 229 SYSCTL_VNET_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS, 230 ipsecstats, CTLFLAG_RD, &VNET_NAME(ipsec6stat), ipsecstat, 231 "IPsec IPv6 statistics."); 232 #endif /* INET6 */ 233 234 static int ipsec_setspidx_inpcb __P((struct mbuf *, struct inpcb *)); 235 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 236 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 237 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 238 #ifdef INET6 239 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 240 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 241 #endif 242 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 243 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 244 static void vshiftl __P((unsigned char *, int, int)); 245 246 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 247 248 /* 249 * Return a held reference to the default SP. 250 */ 251 static struct secpolicy * 252 key_allocsp_default(const char* where, int tag) 253 { 254 struct secpolicy *sp; 255 256 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 257 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 258 259 sp = &V_ip4_def_policy; 260 if (sp->policy != IPSEC_POLICY_DISCARD && 261 sp->policy != IPSEC_POLICY_NONE) { 262 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 263 sp->policy, IPSEC_POLICY_NONE)); 264 sp->policy = IPSEC_POLICY_NONE; 265 } 266 key_addref(sp); 267 268 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 269 printf("DP key_allocsp_default returns SP:%p (%u)\n", 270 sp, sp->refcnt)); 271 return (sp); 272 } 273 #define KEY_ALLOCSP_DEFAULT() \ 274 key_allocsp_default(__FILE__, __LINE__) 275 276 /* 277 * For OUTBOUND packet having a socket. Searching SPD for packet, 278 * and return a pointer to SP. 279 * OUT: NULL: no apropreate SP found, the following value is set to error. 280 * 0 : bypass 281 * EACCES : discard packet. 282 * ENOENT : ipsec_acquire() in progress, maybe. 283 * others : error occured. 284 * others: a pointer to SP 285 * 286 * NOTE: IPv6 mapped adddress concern is implemented here. 287 */ 288 struct secpolicy * 289 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 290 { 291 struct secpolicy *sp; 292 293 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 294 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 295 ("invalid direction %u", dir)); 296 297 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 298 if (sp == NULL) /*XXX????*/ 299 sp = KEY_ALLOCSP_DEFAULT(); 300 IPSEC_ASSERT(sp != NULL, ("null SP")); 301 return (sp); 302 } 303 304 /* 305 * For OUTBOUND packet having a socket. Searching SPD for packet, 306 * and return a pointer to SP. 307 * OUT: NULL: no apropreate SP found, the following value is set to error. 308 * 0 : bypass 309 * EACCES : discard packet. 310 * ENOENT : ipsec_acquire() in progress, maybe. 311 * others : error occured. 312 * others: a pointer to SP 313 * 314 * NOTE: IPv6 mapped adddress concern is implemented here. 315 */ 316 static struct secpolicy * 317 ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb *inp, int *error) 318 { 319 struct inpcbpolicy *pcbsp; 320 struct secpolicy *currsp = NULL; /* Policy on socket. */ 321 struct secpolicy *sp; 322 323 IPSEC_ASSERT(m != NULL, ("null mbuf")); 324 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 325 IPSEC_ASSERT(error != NULL, ("null error")); 326 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 327 ("invalid direction %u", dir)); 328 329 /* Set spidx in pcb. */ 330 *error = ipsec_setspidx_inpcb(m, inp); 331 if (*error) 332 return (NULL); 333 334 pcbsp = inp->inp_sp; 335 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 336 switch (dir) { 337 case IPSEC_DIR_INBOUND: 338 currsp = pcbsp->sp_in; 339 break; 340 case IPSEC_DIR_OUTBOUND: 341 currsp = pcbsp->sp_out; 342 break; 343 } 344 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 345 346 if (pcbsp->priv) { /* When privilieged socket. */ 347 switch (currsp->policy) { 348 case IPSEC_POLICY_BYPASS: 349 case IPSEC_POLICY_IPSEC: 350 key_addref(currsp); 351 sp = currsp; 352 break; 353 354 case IPSEC_POLICY_ENTRUST: 355 /* Look for a policy in SPD. */ 356 sp = KEY_ALLOCSP(&currsp->spidx, dir); 357 if (sp == NULL) /* No SP found. */ 358 sp = KEY_ALLOCSP_DEFAULT(); 359 break; 360 361 default: 362 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 363 __func__, currsp->policy)); 364 *error = EINVAL; 365 return (NULL); 366 } 367 } else { /* Unpriv, SPD has policy. */ 368 sp = KEY_ALLOCSP(&currsp->spidx, dir); 369 if (sp == NULL) { /* No SP found. */ 370 switch (currsp->policy) { 371 case IPSEC_POLICY_BYPASS: 372 ipseclog((LOG_ERR, "%s: Illegal policy for " 373 "non-priviliged defined %d\n", 374 __func__, currsp->policy)); 375 *error = EINVAL; 376 return (NULL); 377 378 case IPSEC_POLICY_ENTRUST: 379 sp = KEY_ALLOCSP_DEFAULT(); 380 break; 381 382 case IPSEC_POLICY_IPSEC: 383 key_addref(currsp); 384 sp = currsp; 385 break; 386 387 default: 388 ipseclog((LOG_ERR, "%s: Invalid policy for " 389 "PCB %d\n", __func__, currsp->policy)); 390 *error = EINVAL; 391 return (NULL); 392 } 393 } 394 } 395 IPSEC_ASSERT(sp != NULL, 396 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 397 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 398 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 399 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 400 return (sp); 401 } 402 403 /* 404 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 405 * and return a pointer to SP. 406 * OUT: positive: a pointer to the entry for security policy leaf matched. 407 * NULL: no apropreate SP found, the following value is set to error. 408 * 0 : bypass 409 * EACCES : discard packet. 410 * ENOENT : ipsec_acquire() in progress, maybe. 411 * others : error occured. 412 */ 413 struct secpolicy * 414 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 415 { 416 struct secpolicyindex spidx; 417 struct secpolicy *sp; 418 419 IPSEC_ASSERT(m != NULL, ("null mbuf")); 420 IPSEC_ASSERT(error != NULL, ("null error")); 421 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 422 ("invalid direction %u", dir)); 423 424 sp = NULL; 425 if (key_havesp(dir)) { 426 /* Make an index to look for a policy. */ 427 *error = ipsec_setspidx(m, &spidx, 428 (flag & IP_FORWARDING) ? 0 : 1); 429 if (*error != 0) { 430 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 431 __func__, dir, flag)); 432 return (NULL); 433 } 434 spidx.dir = dir; 435 436 sp = KEY_ALLOCSP(&spidx, dir); 437 } 438 if (sp == NULL) /* No SP found, use system default. */ 439 sp = KEY_ALLOCSP_DEFAULT(); 440 IPSEC_ASSERT(sp != NULL, ("null SP")); 441 return (sp); 442 } 443 444 struct secpolicy * 445 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 446 struct inpcb *inp) 447 { 448 struct secpolicy *sp; 449 450 *error = 0; 451 if (inp == NULL) 452 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 453 else 454 sp = ipsec_getpolicybysock(m, dir, inp, error); 455 if (sp == NULL) { 456 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 457 IPSECSTAT_INC(ips_out_inval); 458 return (NULL); 459 } 460 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 461 switch (sp->policy) { 462 case IPSEC_POLICY_ENTRUST: 463 default: 464 printf("%s: invalid policy %u\n", __func__, sp->policy); 465 /* FALLTHROUGH */ 466 case IPSEC_POLICY_DISCARD: 467 IPSECSTAT_INC(ips_out_polvio); 468 *error = -EINVAL; /* Packet is discarded by caller. */ 469 break; 470 case IPSEC_POLICY_BYPASS: 471 case IPSEC_POLICY_NONE: 472 KEY_FREESP(&sp); 473 sp = NULL; /* NB: force NULL result. */ 474 break; 475 case IPSEC_POLICY_IPSEC: 476 if (sp->req == NULL) /* Acquire a SA. */ 477 *error = key_spdacquire(sp); 478 break; 479 } 480 if (*error != 0) { 481 KEY_FREESP(&sp); 482 sp = NULL; 483 } 484 return (sp); 485 } 486 487 static int 488 ipsec_setspidx_inpcb(struct mbuf *m, struct inpcb *inp) 489 { 490 int error; 491 492 IPSEC_ASSERT(inp != NULL, ("null inp")); 493 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 494 IPSEC_ASSERT(inp->inp_sp->sp_out != NULL && inp->inp_sp->sp_in != NULL, 495 ("null sp_in || sp_out")); 496 497 error = ipsec_setspidx(m, &inp->inp_sp->sp_in->spidx, 1); 498 if (error == 0) { 499 inp->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 500 inp->inp_sp->sp_out->spidx = inp->inp_sp->sp_in->spidx; 501 inp->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 502 } else { 503 bzero(&inp->inp_sp->sp_in->spidx, 504 sizeof (inp->inp_sp->sp_in->spidx)); 505 bzero(&inp->inp_sp->sp_out->spidx, 506 sizeof (inp->inp_sp->sp_in->spidx)); 507 } 508 return (error); 509 } 510 511 /* 512 * Configure security policy index (src/dst/proto/sport/dport) 513 * by looking at the content of mbuf. 514 * The caller is responsible for error recovery (like clearing up spidx). 515 */ 516 static int 517 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 518 { 519 struct ip *ip = NULL; 520 struct ip ipbuf; 521 u_int v; 522 struct mbuf *n; 523 int len; 524 int error; 525 526 IPSEC_ASSERT(m != NULL, ("null mbuf")); 527 528 /* 529 * Validate m->m_pkthdr.len. We see incorrect length if we 530 * mistakenly call this function with inconsistent mbuf chain 531 * (like 4.4BSD tcp/udp processing). XXX Should we panic here? 532 */ 533 len = 0; 534 for (n = m; n; n = n->m_next) 535 len += n->m_len; 536 if (m->m_pkthdr.len != len) { 537 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 538 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 539 __func__, len, m->m_pkthdr.len)); 540 return (EINVAL); 541 } 542 543 if (m->m_pkthdr.len < sizeof(struct ip)) { 544 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 545 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 546 __func__, m->m_pkthdr.len)); 547 return (EINVAL); 548 } 549 550 if (m->m_len >= sizeof(*ip)) 551 ip = mtod(m, struct ip *); 552 else { 553 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 554 ip = &ipbuf; 555 } 556 v = ip->ip_v; 557 switch (v) { 558 case 4: 559 error = ipsec4_setspidx_ipaddr(m, spidx); 560 if (error) 561 return (error); 562 ipsec4_get_ulp(m, spidx, needport); 563 return (0); 564 #ifdef INET6 565 case 6: 566 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 567 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 568 printf("%s: pkthdr len(%d) too small (v6), " 569 "ignored\n", __func__, m->m_pkthdr.len)); 570 return (EINVAL); 571 } 572 error = ipsec6_setspidx_ipaddr(m, spidx); 573 if (error) 574 return (error); 575 ipsec6_get_ulp(m, spidx, needport); 576 return (0); 577 #endif 578 default: 579 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 580 printf("%s: " "unknown IP version %u, ignored.\n", 581 __func__, v)); 582 return (EINVAL); 583 } 584 } 585 586 static void 587 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 588 { 589 u_int8_t nxt; 590 int off; 591 592 /* Sanity check. */ 593 IPSEC_ASSERT(m != NULL, ("null mbuf")); 594 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 595 596 /* NB: ip_input() flips it into host endian. XXX Need more checking. */ 597 if (m->m_len >= sizeof (struct ip)) { 598 struct ip *ip = mtod(m, struct ip *); 599 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 600 goto done; 601 off = ip->ip_hl << 2; 602 nxt = ip->ip_p; 603 } else { 604 struct ip ih; 605 606 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 607 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 608 goto done; 609 off = ih.ip_hl << 2; 610 nxt = ih.ip_p; 611 } 612 613 while (off < m->m_pkthdr.len) { 614 struct ip6_ext ip6e; 615 struct tcphdr th; 616 struct udphdr uh; 617 618 switch (nxt) { 619 case IPPROTO_TCP: 620 spidx->ul_proto = nxt; 621 if (!needport) 622 goto done_proto; 623 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 624 goto done; 625 m_copydata(m, off, sizeof (th), (caddr_t) &th); 626 spidx->src.sin.sin_port = th.th_sport; 627 spidx->dst.sin.sin_port = th.th_dport; 628 return; 629 case IPPROTO_UDP: 630 spidx->ul_proto = nxt; 631 if (!needport) 632 goto done_proto; 633 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 634 goto done; 635 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 636 spidx->src.sin.sin_port = uh.uh_sport; 637 spidx->dst.sin.sin_port = uh.uh_dport; 638 return; 639 case IPPROTO_AH: 640 if (off + sizeof(ip6e) > m->m_pkthdr.len) 641 goto done; 642 /* XXX Sigh, this works but is totally bogus. */ 643 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 644 off += (ip6e.ip6e_len + 2) << 2; 645 nxt = ip6e.ip6e_nxt; 646 break; 647 case IPPROTO_ICMP: 648 default: 649 /* XXX Intermediate headers??? */ 650 spidx->ul_proto = nxt; 651 goto done_proto; 652 } 653 } 654 done: 655 spidx->ul_proto = IPSEC_ULPROTO_ANY; 656 done_proto: 657 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 658 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 659 } 660 661 /* Assumes that m is sane. */ 662 static int 663 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 664 { 665 static const struct sockaddr_in template = { 666 sizeof (struct sockaddr_in), 667 AF_INET, 668 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 669 }; 670 671 spidx->src.sin = template; 672 spidx->dst.sin = template; 673 674 if (m->m_len < sizeof (struct ip)) { 675 m_copydata(m, offsetof(struct ip, ip_src), 676 sizeof (struct in_addr), 677 (caddr_t) &spidx->src.sin.sin_addr); 678 m_copydata(m, offsetof(struct ip, ip_dst), 679 sizeof (struct in_addr), 680 (caddr_t) &spidx->dst.sin.sin_addr); 681 } else { 682 struct ip *ip = mtod(m, struct ip *); 683 spidx->src.sin.sin_addr = ip->ip_src; 684 spidx->dst.sin.sin_addr = ip->ip_dst; 685 } 686 687 spidx->prefs = sizeof(struct in_addr) << 3; 688 spidx->prefd = sizeof(struct in_addr) << 3; 689 690 return (0); 691 } 692 693 #ifdef INET6 694 static void 695 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 696 { 697 int off, nxt; 698 struct tcphdr th; 699 struct udphdr uh; 700 struct icmp6_hdr ih; 701 702 /* Sanity check. */ 703 if (m == NULL) 704 panic("%s: NULL pointer was passed.\n", __func__); 705 706 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 707 printf("%s:\n", __func__); kdebug_mbuf(m)); 708 709 /* Set default. */ 710 spidx->ul_proto = IPSEC_ULPROTO_ANY; 711 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 712 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 713 714 nxt = -1; 715 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 716 if (off < 0 || m->m_pkthdr.len < off) 717 return; 718 719 switch (nxt) { 720 case IPPROTO_TCP: 721 spidx->ul_proto = nxt; 722 if (!needport) 723 break; 724 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 725 break; 726 m_copydata(m, off, sizeof(th), (caddr_t)&th); 727 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 728 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 729 break; 730 case IPPROTO_UDP: 731 spidx->ul_proto = nxt; 732 if (!needport) 733 break; 734 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 735 break; 736 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 737 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 738 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 739 break; 740 case IPPROTO_ICMPV6: 741 spidx->ul_proto = nxt; 742 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 743 break; 744 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 745 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 746 htons((uint16_t)ih.icmp6_type); 747 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 748 htons((uint16_t)ih.icmp6_code); 749 break; 750 default: 751 /* XXX Intermediate headers??? */ 752 spidx->ul_proto = nxt; 753 break; 754 } 755 } 756 757 /* Assumes that m is sane. */ 758 static int 759 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 760 { 761 struct ip6_hdr *ip6 = NULL; 762 struct ip6_hdr ip6buf; 763 struct sockaddr_in6 *sin6; 764 765 if (m->m_len >= sizeof(*ip6)) 766 ip6 = mtod(m, struct ip6_hdr *); 767 else { 768 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 769 ip6 = &ip6buf; 770 } 771 772 sin6 = (struct sockaddr_in6 *)&spidx->src; 773 bzero(sin6, sizeof(*sin6)); 774 sin6->sin6_family = AF_INET6; 775 sin6->sin6_len = sizeof(struct sockaddr_in6); 776 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 777 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 778 sin6->sin6_addr.s6_addr16[1] = 0; 779 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 780 } 781 spidx->prefs = sizeof(struct in6_addr) << 3; 782 783 sin6 = (struct sockaddr_in6 *)&spidx->dst; 784 bzero(sin6, sizeof(*sin6)); 785 sin6->sin6_family = AF_INET6; 786 sin6->sin6_len = sizeof(struct sockaddr_in6); 787 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 788 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 789 sin6->sin6_addr.s6_addr16[1] = 0; 790 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 791 } 792 spidx->prefd = sizeof(struct in6_addr) << 3; 793 794 return (0); 795 } 796 #endif 797 798 static void 799 ipsec_delpcbpolicy(struct inpcbpolicy *p) 800 { 801 802 free(p, M_IPSEC_INPCB); 803 } 804 805 /* Initialize policy in PCB. */ 806 int 807 ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp) 808 { 809 struct inpcbpolicy *new; 810 811 /* Sanity check. */ 812 if (so == NULL || pcb_sp == NULL) 813 panic("%s: NULL pointer was passed.\n", __func__); 814 815 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 816 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 817 if (new == NULL) { 818 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 819 return (ENOBUFS); 820 } 821 822 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 823 824 if ((new->sp_in = KEY_NEWSP()) == NULL) { 825 ipsec_delpcbpolicy(new); 826 return (ENOBUFS); 827 } 828 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 829 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 830 831 if ((new->sp_out = KEY_NEWSP()) == NULL) { 832 KEY_FREESP(&new->sp_in); 833 ipsec_delpcbpolicy(new); 834 return (ENOBUFS); 835 } 836 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 837 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 838 839 *pcb_sp = new; 840 841 return (0); 842 } 843 844 /* Copy old IPsec policy into new. */ 845 int 846 ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new) 847 { 848 struct secpolicy *sp; 849 850 sp = ipsec_deepcopy_policy(old->sp_in); 851 if (sp) { 852 KEY_FREESP(&new->sp_in); 853 new->sp_in = sp; 854 } else 855 return (ENOBUFS); 856 857 sp = ipsec_deepcopy_policy(old->sp_out); 858 if (sp) { 859 KEY_FREESP(&new->sp_out); 860 new->sp_out = sp; 861 } else 862 return (ENOBUFS); 863 864 new->priv = old->priv; 865 866 return (0); 867 } 868 869 struct ipsecrequest * 870 ipsec_newisr(void) 871 { 872 struct ipsecrequest *p; 873 874 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 875 if (p != NULL) 876 IPSECREQUEST_LOCK_INIT(p); 877 return (p); 878 } 879 880 void 881 ipsec_delisr(struct ipsecrequest *p) 882 { 883 884 IPSECREQUEST_LOCK_DESTROY(p); 885 free(p, M_IPSEC_SR); 886 } 887 888 /* Deep-copy a policy in PCB. */ 889 static struct secpolicy * 890 ipsec_deepcopy_policy(struct secpolicy *src) 891 { 892 struct ipsecrequest *newchain = NULL; 893 struct ipsecrequest *p; 894 struct ipsecrequest **q; 895 struct ipsecrequest *r; 896 struct secpolicy *dst; 897 898 if (src == NULL) 899 return (NULL); 900 dst = KEY_NEWSP(); 901 if (dst == NULL) 902 return (NULL); 903 904 /* 905 * Deep-copy IPsec request chain. This is required since struct 906 * ipsecrequest is not reference counted. 907 */ 908 q = &newchain; 909 for (p = src->req; p; p = p->next) { 910 *q = ipsec_newisr(); 911 if (*q == NULL) 912 goto fail; 913 (*q)->saidx.proto = p->saidx.proto; 914 (*q)->saidx.mode = p->saidx.mode; 915 (*q)->level = p->level; 916 (*q)->saidx.reqid = p->saidx.reqid; 917 918 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 919 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 920 921 (*q)->sp = dst; 922 923 q = &((*q)->next); 924 } 925 926 dst->req = newchain; 927 dst->state = src->state; 928 dst->policy = src->policy; 929 /* Do not touch the refcnt fields. */ 930 931 return (dst); 932 933 fail: 934 for (p = newchain; p; p = r) { 935 r = p->next; 936 ipsec_delisr(p); 937 p = NULL; 938 } 939 KEY_FREESP(&dst); 940 return (NULL); 941 } 942 943 /* Set policy and IPsec request if present. */ 944 static int 945 ipsec_set_policy_internal(struct secpolicy **pcb_sp, int optname, 946 caddr_t request, size_t len, struct ucred *cred) 947 { 948 struct sadb_x_policy *xpl; 949 struct secpolicy *newsp = NULL; 950 int error; 951 952 /* Sanity check. */ 953 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 954 return (EINVAL); 955 if (len < sizeof(*xpl)) 956 return (EINVAL); 957 xpl = (struct sadb_x_policy *)request; 958 959 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 960 printf("%s: passed policy\n", __func__); 961 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 962 963 /* Check policy type. */ 964 /* ipsec_set_policy_internal() accepts IPSEC, ENTRUST and BYPASS. */ 965 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 966 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 967 return (EINVAL); 968 969 /* Check privileged socket. */ 970 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 971 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0); 972 if (error) 973 return (EACCES); 974 } 975 976 /* Allocating new SP entry. */ 977 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 978 return (error); 979 980 newsp->state = IPSEC_SPSTATE_ALIVE; 981 982 /* Clear old SP and set new SP. */ 983 KEY_FREESP(pcb_sp); 984 *pcb_sp = newsp; 985 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 986 printf("%s: new policy\n", __func__); 987 kdebug_secpolicy(newsp)); 988 989 return (0); 990 } 991 992 int 993 ipsec_set_policy(struct inpcb *inp, int optname, caddr_t request, 994 size_t len, struct ucred *cred) 995 { 996 struct sadb_x_policy *xpl; 997 struct secpolicy **pcb_sp; 998 999 /* Sanity check. */ 1000 if (inp == NULL || request == NULL) 1001 return (EINVAL); 1002 if (len < sizeof(*xpl)) 1003 return (EINVAL); 1004 xpl = (struct sadb_x_policy *)request; 1005 1006 /* Select direction. */ 1007 switch (xpl->sadb_x_policy_dir) { 1008 case IPSEC_DIR_INBOUND: 1009 pcb_sp = &inp->inp_sp->sp_in; 1010 break; 1011 case IPSEC_DIR_OUTBOUND: 1012 pcb_sp = &inp->inp_sp->sp_out; 1013 break; 1014 default: 1015 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1016 xpl->sadb_x_policy_dir)); 1017 return (EINVAL); 1018 } 1019 1020 return (ipsec_set_policy_internal(pcb_sp, optname, request, len, cred)); 1021 } 1022 1023 int 1024 ipsec_get_policy(struct inpcb *inp, caddr_t request, size_t len, 1025 struct mbuf **mp) 1026 { 1027 struct sadb_x_policy *xpl; 1028 struct secpolicy *pcb_sp; 1029 1030 /* Sanity check. */ 1031 if (inp == NULL || request == NULL || mp == NULL) 1032 return (EINVAL); 1033 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1034 if (len < sizeof(*xpl)) 1035 return (EINVAL); 1036 xpl = (struct sadb_x_policy *)request; 1037 1038 /* Select direction. */ 1039 switch (xpl->sadb_x_policy_dir) { 1040 case IPSEC_DIR_INBOUND: 1041 pcb_sp = inp->inp_sp->sp_in; 1042 break; 1043 case IPSEC_DIR_OUTBOUND: 1044 pcb_sp = inp->inp_sp->sp_out; 1045 break; 1046 default: 1047 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1048 xpl->sadb_x_policy_dir)); 1049 return (EINVAL); 1050 } 1051 1052 /* Sanity check. Should be an IPSEC_ASSERT. */ 1053 if (pcb_sp == NULL) 1054 return (EINVAL); 1055 1056 *mp = key_sp2msg(pcb_sp); 1057 if (!*mp) { 1058 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1059 return (ENOBUFS); 1060 } 1061 1062 (*mp)->m_type = MT_DATA; 1063 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1064 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1065 1066 return (0); 1067 } 1068 1069 /* Delete policy in PCB. */ 1070 int 1071 ipsec_delete_pcbpolicy(struct inpcb *inp) 1072 { 1073 IPSEC_ASSERT(inp != NULL, ("null inp")); 1074 1075 if (inp->inp_sp == NULL) 1076 return (0); 1077 1078 if (inp->inp_sp->sp_in != NULL) 1079 KEY_FREESP(&inp->inp_sp->sp_in); 1080 1081 if (inp->inp_sp->sp_out != NULL) 1082 KEY_FREESP(&inp->inp_sp->sp_out); 1083 1084 ipsec_delpcbpolicy(inp->inp_sp); 1085 inp->inp_sp = NULL; 1086 1087 return (0); 1088 } 1089 1090 /* 1091 * Return current level. 1092 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1093 */ 1094 u_int 1095 ipsec_get_reqlevel(struct ipsecrequest *isr) 1096 { 1097 u_int level = 0; 1098 u_int esp_trans_deflev, esp_net_deflev; 1099 u_int ah_trans_deflev, ah_net_deflev; 1100 1101 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1102 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1103 ("af family mismatch, src %u, dst %u", 1104 isr->sp->spidx.src.sa.sa_family, 1105 isr->sp->spidx.dst.sa.sa_family)); 1106 1107 /* XXX Note that we have ipseclog() expanded here - code sync issue. */ 1108 #define IPSEC_CHECK_DEFAULT(lev) \ 1109 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1110 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1111 ? (V_ipsec_debug \ 1112 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1113 (lev), IPSEC_LEVEL_REQUIRE) \ 1114 : 0), \ 1115 (lev) = IPSEC_LEVEL_REQUIRE, \ 1116 (lev) \ 1117 : (lev)) 1118 1119 /* Set default level. */ 1120 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1121 #ifdef INET 1122 case AF_INET: 1123 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_trans_deflev); 1124 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_net_deflev); 1125 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_trans_deflev); 1126 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_net_deflev); 1127 break; 1128 #endif 1129 #ifdef INET6 1130 case AF_INET6: 1131 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_trans_deflev); 1132 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_net_deflev); 1133 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_trans_deflev); 1134 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_net_deflev); 1135 break; 1136 #endif /* INET6 */ 1137 default: 1138 panic("%s: unknown af %u", 1139 __func__, isr->sp->spidx.src.sa.sa_family); 1140 } 1141 1142 #undef IPSEC_CHECK_DEFAULT 1143 1144 /* Set level. */ 1145 switch (isr->level) { 1146 case IPSEC_LEVEL_DEFAULT: 1147 switch (isr->saidx.proto) { 1148 case IPPROTO_ESP: 1149 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1150 level = esp_net_deflev; 1151 else 1152 level = esp_trans_deflev; 1153 break; 1154 case IPPROTO_AH: 1155 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1156 level = ah_net_deflev; 1157 else 1158 level = ah_trans_deflev; 1159 break; 1160 case IPPROTO_IPCOMP: 1161 /* 1162 * We don't really care, as IPcomp document says that 1163 * we shouldn't compress small packets. 1164 */ 1165 level = IPSEC_LEVEL_USE; 1166 break; 1167 default: 1168 panic("%s: Illegal protocol defined %u\n", __func__, 1169 isr->saidx.proto); 1170 } 1171 break; 1172 1173 case IPSEC_LEVEL_USE: 1174 case IPSEC_LEVEL_REQUIRE: 1175 level = isr->level; 1176 break; 1177 case IPSEC_LEVEL_UNIQUE: 1178 level = IPSEC_LEVEL_REQUIRE; 1179 break; 1180 1181 default: 1182 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1183 } 1184 1185 return (level); 1186 } 1187 1188 /* 1189 * Check security policy requirements against the actual 1190 * packet contents. Return one if the packet should be 1191 * reject as "invalid"; otherwiser return zero to have the 1192 * packet treated as "valid". 1193 * 1194 * OUT: 1195 * 0: valid 1196 * 1: invalid 1197 */ 1198 int 1199 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1200 { 1201 struct ipsecrequest *isr; 1202 int need_auth; 1203 1204 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1205 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1206 1207 /* Check policy. */ 1208 switch (sp->policy) { 1209 case IPSEC_POLICY_DISCARD: 1210 return (1); 1211 case IPSEC_POLICY_BYPASS: 1212 case IPSEC_POLICY_NONE: 1213 return (0); 1214 } 1215 1216 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1217 ("invalid policy %u", sp->policy)); 1218 1219 /* XXX Should compare policy against IPsec header history. */ 1220 1221 need_auth = 0; 1222 for (isr = sp->req; isr != NULL; isr = isr->next) { 1223 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1224 continue; 1225 switch (isr->saidx.proto) { 1226 case IPPROTO_ESP: 1227 if ((m->m_flags & M_DECRYPTED) == 0) { 1228 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1229 printf("%s: ESP m_flags:%x\n", __func__, 1230 m->m_flags)); 1231 return (1); 1232 } 1233 1234 if (!need_auth && 1235 isr->sav != NULL && 1236 isr->sav->tdb_authalgxform != NULL && 1237 (m->m_flags & M_AUTHIPDGM) == 0) { 1238 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1239 printf("%s: ESP/AH m_flags:%x\n", __func__, 1240 m->m_flags)); 1241 return (1); 1242 } 1243 break; 1244 case IPPROTO_AH: 1245 need_auth = 1; 1246 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1247 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1248 printf("%s: AH m_flags:%x\n", __func__, 1249 m->m_flags)); 1250 return (1); 1251 } 1252 break; 1253 case IPPROTO_IPCOMP: 1254 /* 1255 * We don't really care, as IPcomp document 1256 * says that we shouldn't compress small 1257 * packets. IPComp policy should always be 1258 * treated as being in "use" level. 1259 */ 1260 break; 1261 } 1262 } 1263 return (0); /* Valid. */ 1264 } 1265 1266 static int 1267 ipsec46_in_reject(struct mbuf *m, struct inpcb *inp) 1268 { 1269 struct secpolicy *sp; 1270 int error; 1271 int result; 1272 1273 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1274 1275 /* 1276 * Get SP for this packet. 1277 * When we are called from ip_forward(), we call 1278 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1279 */ 1280 if (inp == NULL) 1281 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1282 else 1283 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1284 1285 if (sp != NULL) { 1286 result = ipsec_in_reject(sp, m); 1287 KEY_FREESP(&sp); 1288 } else { 1289 result = 0; /* XXX Should be panic? 1290 * -> No, there may be error. */ 1291 } 1292 return (result); 1293 } 1294 1295 /* 1296 * Check AH/ESP integrity. 1297 * This function is called from tcp_input(), udp_input(), 1298 * and {ah,esp}4_input for tunnel mode. 1299 */ 1300 int 1301 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp) 1302 { 1303 int result; 1304 1305 result = ipsec46_in_reject(m, inp); 1306 if (result) 1307 IPSECSTAT_INC(ips_in_polvio); 1308 1309 return (result); 1310 } 1311 1312 #ifdef INET6 1313 /* 1314 * Check AH/ESP integrity. 1315 * This function is called from tcp6_input(), udp6_input(), 1316 * and {ah,esp}6_input for tunnel mode. 1317 */ 1318 int 1319 ipsec6_in_reject(struct mbuf *m, struct inpcb *inp) 1320 { 1321 int result; 1322 1323 result = ipsec46_in_reject(m, inp); 1324 if (result) 1325 IPSEC6STAT_INC(ips_in_polvio); 1326 1327 return (result); 1328 } 1329 #endif 1330 1331 /* 1332 * Compute the byte size to be occupied by IPsec header. 1333 * In case it is tunnelled, it includes the size of outer IP header. 1334 * NOTE: SP passed is freed in this function. 1335 */ 1336 static size_t 1337 ipsec_hdrsiz_internal(struct secpolicy *sp) 1338 { 1339 struct ipsecrequest *isr; 1340 size_t size; 1341 1342 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1343 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1344 1345 switch (sp->policy) { 1346 case IPSEC_POLICY_DISCARD: 1347 case IPSEC_POLICY_BYPASS: 1348 case IPSEC_POLICY_NONE: 1349 return (0); 1350 } 1351 1352 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1353 ("invalid policy %u", sp->policy)); 1354 1355 size = 0; 1356 for (isr = sp->req; isr != NULL; isr = isr->next) { 1357 size_t clen = 0; 1358 1359 switch (isr->saidx.proto) { 1360 case IPPROTO_ESP: 1361 clen = esp_hdrsiz(isr->sav); 1362 break; 1363 case IPPROTO_AH: 1364 clen = ah_hdrsiz(isr->sav); 1365 break; 1366 case IPPROTO_IPCOMP: 1367 clen = sizeof(struct ipcomp); 1368 break; 1369 } 1370 1371 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1372 switch (isr->saidx.dst.sa.sa_family) { 1373 case AF_INET: 1374 clen += sizeof(struct ip); 1375 break; 1376 #ifdef INET6 1377 case AF_INET6: 1378 clen += sizeof(struct ip6_hdr); 1379 break; 1380 #endif 1381 default: 1382 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1383 "IPsec tunnel SA\n", __func__, 1384 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1385 break; 1386 } 1387 } 1388 size += clen; 1389 } 1390 1391 return (size); 1392 } 1393 1394 /* 1395 * This function is called from ipsec_hdrsiz_tcp(), ip_ipsec_mtu(), 1396 * disabled ip6_ipsec_mtu() and ip6_forward(). 1397 */ 1398 size_t 1399 ipsec_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp) 1400 { 1401 struct secpolicy *sp; 1402 int error; 1403 size_t size; 1404 1405 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1406 1407 /* Get SP for this packet. 1408 * When we are called from ip_forward(), we call 1409 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1410 */ 1411 if (inp == NULL) 1412 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1413 else 1414 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1415 1416 if (sp != NULL) { 1417 size = ipsec_hdrsiz_internal(sp); 1418 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1419 printf("%s: size:%lu.\n", __func__, 1420 (unsigned long)size)); 1421 1422 KEY_FREESP(&sp); 1423 } else { 1424 size = 0; /* XXX Should be panic? 1425 * -> No, we are called w/o knowing if 1426 * IPsec processing is needed. */ 1427 } 1428 return (size); 1429 } 1430 1431 /* 1432 * Check the variable replay window. 1433 * ipsec_chkreplay() performs replay check before ICV verification. 1434 * ipsec_updatereplay() updates replay bitmap. This must be called after 1435 * ICV verification (it also performs replay check, which is usually done 1436 * beforehand). 1437 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1438 * 1439 * Based on RFC 2401. 1440 */ 1441 int 1442 ipsec_chkreplay(u_int32_t seq, struct secasvar *sav) 1443 { 1444 const struct secreplay *replay; 1445 u_int32_t diff; 1446 int fr; 1447 u_int32_t wsizeb; /* Constant: bits of window size. */ 1448 int frlast; /* Constant: last frame. */ 1449 1450 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1451 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1452 1453 replay = sav->replay; 1454 1455 if (replay->wsize == 0) 1456 return (1); /* No need to check replay. */ 1457 1458 /* Constant. */ 1459 frlast = replay->wsize - 1; 1460 wsizeb = replay->wsize << 3; 1461 1462 /* Sequence number of 0 is invalid. */ 1463 if (seq == 0) 1464 return (0); 1465 1466 /* First time is always okay. */ 1467 if (replay->count == 0) 1468 return (1); 1469 1470 if (seq > replay->lastseq) { 1471 /* Larger sequences are okay. */ 1472 return (1); 1473 } else { 1474 /* seq is equal or less than lastseq. */ 1475 diff = replay->lastseq - seq; 1476 1477 /* Over range to check, i.e. too old or wrapped. */ 1478 if (diff >= wsizeb) 1479 return (0); 1480 1481 fr = frlast - diff / 8; 1482 1483 /* This packet already seen? */ 1484 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1485 return (0); 1486 1487 /* Out of order but good. */ 1488 return (1); 1489 } 1490 } 1491 1492 /* 1493 * Check replay counter whether to update or not. 1494 * OUT: 0: OK 1495 * 1: NG 1496 */ 1497 int 1498 ipsec_updatereplay(u_int32_t seq, struct secasvar *sav) 1499 { 1500 struct secreplay *replay; 1501 u_int32_t diff; 1502 int fr; 1503 u_int32_t wsizeb; /* Constant: bits of window size. */ 1504 int frlast; /* Constant: last frame. */ 1505 1506 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1507 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1508 1509 replay = sav->replay; 1510 1511 if (replay->wsize == 0) 1512 goto ok; /* No need to check replay. */ 1513 1514 /* Constant. */ 1515 frlast = replay->wsize - 1; 1516 wsizeb = replay->wsize << 3; 1517 1518 /* Sequence number of 0 is invalid. */ 1519 if (seq == 0) 1520 return (1); 1521 1522 /* First time. */ 1523 if (replay->count == 0) { 1524 replay->lastseq = seq; 1525 bzero(replay->bitmap, replay->wsize); 1526 (replay->bitmap)[frlast] = 1; 1527 goto ok; 1528 } 1529 1530 if (seq > replay->lastseq) { 1531 /* seq is larger than lastseq. */ 1532 diff = seq - replay->lastseq; 1533 1534 /* New larger sequence number. */ 1535 if (diff < wsizeb) { 1536 /* In window. */ 1537 /* Set bit for this packet. */ 1538 vshiftl(replay->bitmap, diff, replay->wsize); 1539 (replay->bitmap)[frlast] |= 1; 1540 } else { 1541 /* This packet has a "way larger". */ 1542 bzero(replay->bitmap, replay->wsize); 1543 (replay->bitmap)[frlast] = 1; 1544 } 1545 replay->lastseq = seq; 1546 1547 /* Larger is good. */ 1548 } else { 1549 /* seq is equal or less than lastseq. */ 1550 diff = replay->lastseq - seq; 1551 1552 /* Over range to check, i.e. too old or wrapped. */ 1553 if (diff >= wsizeb) 1554 return (1); 1555 1556 fr = frlast - diff / 8; 1557 1558 /* This packet already seen? */ 1559 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1560 return (1); 1561 1562 /* Mark as seen. */ 1563 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1564 1565 /* Out of order but good. */ 1566 } 1567 1568 ok: 1569 if (replay->count == ~0) { 1570 1571 /* Set overflow flag. */ 1572 replay->overflow++; 1573 1574 /* Don't increment, no more packets accepted. */ 1575 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1576 return (1); 1577 1578 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1579 __func__, replay->overflow, ipsec_logsastr(sav))); 1580 } 1581 1582 replay->count++; 1583 1584 return (0); 1585 } 1586 1587 /* 1588 * Shift variable length buffer to left. 1589 * IN: bitmap: pointer to the buffer 1590 * nbit: the number of to shift. 1591 * wsize: buffer size (bytes). 1592 */ 1593 static void 1594 vshiftl(unsigned char *bitmap, int nbit, int wsize) 1595 { 1596 int s, j, i; 1597 unsigned char over; 1598 1599 for (j = 0; j < nbit; j += 8) { 1600 s = (nbit - j < 8) ? (nbit - j): 8; 1601 bitmap[0] <<= s; 1602 for (i = 1; i < wsize; i++) { 1603 over = (bitmap[i] >> (8 - s)); 1604 bitmap[i] <<= s; 1605 bitmap[i-1] |= over; 1606 } 1607 } 1608 } 1609 1610 #ifdef INET 1611 /* Return a printable string for the IPv4 address. */ 1612 static char * 1613 inet_ntoa4(struct in_addr ina) 1614 { 1615 static char buf[4][4 * sizeof "123" + 4]; 1616 unsigned char *ucp = (unsigned char *) &ina; 1617 static int i = 3; 1618 1619 /* XXX-BZ Returns static buffer. */ 1620 i = (i + 1) % 4; 1621 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1622 ucp[2] & 0xff, ucp[3] & 0xff); 1623 return (buf[i]); 1624 } 1625 #endif 1626 1627 /* Return a printable string for the address. */ 1628 char * 1629 ipsec_address(union sockaddr_union* sa) 1630 { 1631 #ifdef INET6 1632 char ip6buf[INET6_ADDRSTRLEN]; 1633 #endif 1634 1635 switch (sa->sa.sa_family) { 1636 #ifdef INET 1637 case AF_INET: 1638 return (inet_ntoa4(sa->sin.sin_addr)); 1639 #endif /* INET */ 1640 #ifdef INET6 1641 case AF_INET6: 1642 return (ip6_sprintf(ip6buf, &sa->sin6.sin6_addr)); 1643 #endif /* INET6 */ 1644 default: 1645 return ("(unknown address family)"); 1646 } 1647 } 1648 1649 const char * 1650 ipsec_logsastr(struct secasvar *sav) 1651 { 1652 static char buf[256]; 1653 char *p; 1654 struct secasindex *saidx = &sav->sah->saidx; 1655 1656 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1657 ("address family mismatch")); 1658 1659 p = buf; 1660 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1661 while (p && *p) 1662 p++; 1663 /* NB: only use ipsec_address on one address at a time. */ 1664 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1665 ipsec_address(&saidx->src)); 1666 while (p && *p) 1667 p++; 1668 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1669 ipsec_address(&saidx->dst)); 1670 1671 return (buf); 1672 } 1673 1674 void 1675 ipsec_dumpmbuf(struct mbuf *m) 1676 { 1677 int totlen; 1678 int i; 1679 u_char *p; 1680 1681 totlen = 0; 1682 printf("---\n"); 1683 while (m) { 1684 p = mtod(m, u_char *); 1685 for (i = 0; i < m->m_len; i++) { 1686 printf("%02x ", p[i]); 1687 totlen++; 1688 if (totlen % 16 == 0) 1689 printf("\n"); 1690 } 1691 m = m->m_next; 1692 } 1693 if (totlen % 16 != 0) 1694 printf("\n"); 1695 printf("---\n"); 1696 } 1697 1698 static void 1699 ipsec_init(const void *unused __unused) 1700 { 1701 1702 SECPOLICY_LOCK_INIT(&V_ip4_def_policy); 1703 V_ip4_def_policy.refcnt = 1; /* NB: disallow free. */ 1704 } 1705 VNET_SYSINIT(ipsec_init, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, ipsec_init, 1706 NULL); 1707 1708 1709 /* XXX This stuff doesn't belong here... */ 1710 1711 static struct xformsw* xforms = NULL; 1712 1713 /* 1714 * Register a transform; typically at system startup. 1715 */ 1716 void 1717 xform_register(struct xformsw* xsp) 1718 { 1719 1720 xsp->xf_next = xforms; 1721 xforms = xsp; 1722 } 1723 1724 /* 1725 * Initialize transform support in an sav. 1726 */ 1727 int 1728 xform_init(struct secasvar *sav, int xftype) 1729 { 1730 struct xformsw *xsp; 1731 1732 if (sav->tdb_xform != NULL) /* Previously initialized. */ 1733 return (0); 1734 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1735 if (xsp->xf_type == xftype) 1736 return ((*xsp->xf_init)(sav, xsp)); 1737 return (EINVAL); 1738 }
Cache object: 4f6736f45fcec0be349c1e164ba980f9
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]