Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/ipsec.c
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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/vnet.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 #include <netinet/ip_var.h> 64 #include <netinet/in_var.h> 65 #include <netinet/udp.h> 66 #include <netinet/udp_var.h> 67 #include <netinet/tcp.h> 68 #include <netinet/udp.h> 69 70 #include <netinet/ip6.h> 71 #ifdef INET6 72 #include <netinet6/ip6_var.h> 73 #endif 74 #include <netinet/in_pcb.h> 75 #ifdef INET6 76 #include <netinet/icmp6.h> 77 #endif 78 79 #include <sys/types.h> 80 #include <netipsec/ipsec.h> 81 #ifdef INET6 82 #include <netipsec/ipsec6.h> 83 #endif 84 #include <netipsec/ah_var.h> 85 #include <netipsec/esp_var.h> 86 #include <netipsec/ipcomp.h> /*XXX*/ 87 #include <netipsec/ipcomp_var.h> 88 89 #include <netipsec/key.h> 90 #include <netipsec/keydb.h> 91 #include <netipsec/key_debug.h> 92 93 #include <netipsec/xform.h> 94 95 #include <machine/in_cksum.h> 96 97 #include <opencrypto/cryptodev.h> 98 99 #ifdef IPSEC_DEBUG 100 VNET_DEFINE(int, ipsec_debug) = 1; 101 #else 102 VNET_DEFINE(int, ipsec_debug) = 0; 103 #endif 104 105 /* NB: name changed so netstat doesn't use it. */ 106 VNET_PCPUSTAT_DEFINE(struct ipsecstat, ipsec4stat); 107 VNET_PCPUSTAT_SYSINIT(ipsec4stat); 108 109 #ifdef VIMAGE 110 VNET_PCPUSTAT_SYSUNINIT(ipsec4stat); 111 #endif /* VIMAGE */ 112 113 VNET_DEFINE(int, ip4_ah_offsetmask) = 0; /* maybe IP_DF? */ 114 /* DF bit on encap. 0: clear 1: set 2: copy */ 115 VNET_DEFINE(int, ip4_ipsec_dfbit) = 0; 116 VNET_DEFINE(int, ip4_esp_trans_deflev) = IPSEC_LEVEL_USE; 117 VNET_DEFINE(int, ip4_esp_net_deflev) = IPSEC_LEVEL_USE; 118 VNET_DEFINE(int, ip4_ah_trans_deflev) = IPSEC_LEVEL_USE; 119 VNET_DEFINE(int, ip4_ah_net_deflev) = IPSEC_LEVEL_USE; 120 VNET_DEFINE(struct secpolicy, ip4_def_policy); 121 /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 122 VNET_DEFINE(int, ip4_ipsec_ecn) = 0; 123 VNET_DEFINE(int, ip4_esp_randpad) = -1; 124 125 /* 126 * Crypto support requirements: 127 * 128 * 1 require hardware support 129 * -1 require software support 130 * 0 take anything 131 */ 132 VNET_DEFINE(int, crypto_support) = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 133 134 FEATURE(ipsec, "Internet Protocol Security (IPsec)"); 135 #ifdef IPSEC_NAT_T 136 FEATURE(ipsec_natt, "UDP Encapsulation of IPsec ESP Packets ('NAT-T')"); 137 #endif 138 139 SYSCTL_DECL(_net_inet_ipsec); 140 141 /* net.inet.ipsec */ 142 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, def_policy, 143 CTLFLAG_RW, &VNET_NAME(ip4_def_policy).policy, 0, 144 "IPsec default policy."); 145 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 146 CTLFLAG_RW, &VNET_NAME(ip4_esp_trans_deflev), 0, 147 "Default ESP transport mode level"); 148 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 149 CTLFLAG_RW, &VNET_NAME(ip4_esp_net_deflev), 0, 150 "Default ESP tunnel mode level."); 151 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 152 CTLFLAG_RW, &VNET_NAME(ip4_ah_trans_deflev), 0, 153 "AH transfer mode default level."); 154 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 155 CTLFLAG_RW, &VNET_NAME(ip4_ah_net_deflev), 0, 156 "AH tunnel mode default level."); 157 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, ah_cleartos, 158 CTLFLAG_RW, &VNET_NAME(ah_cleartos), 0, 159 "If set clear type-of-service field when doing AH computation."); 160 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, ah_offsetmask, 161 CTLFLAG_RW, &VNET_NAME(ip4_ah_offsetmask), 0, 162 "If not set clear offset field mask when doing AH computation."); 163 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DFBIT, dfbit, 164 CTLFLAG_RW, &VNET_NAME(ip4_ipsec_dfbit), 0, 165 "Do not fragment bit on encap."); 166 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_ECN, ecn, 167 CTLFLAG_RW, &VNET_NAME(ip4_ipsec_ecn), 0, 168 "Explicit Congestion Notification handling."); 169 SYSCTL_VNET_INT(_net_inet_ipsec, IPSECCTL_DEBUG, debug, 170 CTLFLAG_RW, &VNET_NAME(ipsec_debug), 0, 171 "Enable IPsec debugging output when set."); 172 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, crypto_support, 173 CTLFLAG_RW, &VNET_NAME(crypto_support), 0, 174 "Crypto driver selection."); 175 SYSCTL_VNET_PCPUSTAT(_net_inet_ipsec, OID_AUTO, ipsecstats, struct ipsecstat, 176 ipsec4stat, "IPsec IPv4 statistics."); 177 178 #ifdef REGRESSION 179 /* 180 * When set to 1, IPsec will send packets with the same sequence number. 181 * This allows to verify if the other side has proper replay attacks detection. 182 */ 183 VNET_DEFINE(int, ipsec_replay) = 0; 184 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, test_replay, 185 CTLFLAG_RW, &VNET_NAME(ipsec_replay), 0, 186 "Emulate replay attack"); 187 /* 188 * When set 1, IPsec will send packets with corrupted HMAC. 189 * This allows to verify if the other side properly detects modified packets. 190 */ 191 VNET_DEFINE(int, ipsec_integrity) = 0; 192 SYSCTL_VNET_INT(_net_inet_ipsec, OID_AUTO, test_integrity, 193 CTLFLAG_RW, &VNET_NAME(ipsec_integrity), 0, 194 "Emulate man-in-the-middle attack"); 195 #endif 196 197 #ifdef INET6 198 VNET_PCPUSTAT_DEFINE(struct ipsecstat, ipsec6stat); 199 VNET_PCPUSTAT_SYSINIT(ipsec6stat); 200 201 #ifdef VIMAGE 202 VNET_PCPUSTAT_SYSUNINIT(ipsec6stat); 203 #endif /* VIMAGE */ 204 205 VNET_DEFINE(int, ip6_esp_trans_deflev) = IPSEC_LEVEL_USE; 206 VNET_DEFINE(int, ip6_esp_net_deflev) = IPSEC_LEVEL_USE; 207 VNET_DEFINE(int, ip6_ah_trans_deflev) = IPSEC_LEVEL_USE; 208 VNET_DEFINE(int, ip6_ah_net_deflev) = IPSEC_LEVEL_USE; 209 VNET_DEFINE(int, ip6_ipsec_ecn) = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 210 211 SYSCTL_DECL(_net_inet6_ipsec6); 212 213 /* net.inet6.ipsec6 */ 214 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, def_policy, CTLFLAG_RW, 215 &VNET_NAME(ip4_def_policy).policy, 0, 216 "IPsec default policy."); 217 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, 218 esp_trans_deflev, CTLFLAG_RW, &VNET_NAME(ip6_esp_trans_deflev), 0, 219 "Default ESP transport mode level."); 220 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, 221 esp_net_deflev, CTLFLAG_RW, &VNET_NAME(ip6_esp_net_deflev), 0, 222 "Default ESP tunnel mode level."); 223 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, 224 ah_trans_deflev, CTLFLAG_RW, &VNET_NAME(ip6_ah_trans_deflev), 0, 225 "AH transfer mode default level."); 226 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, 227 ah_net_deflev, CTLFLAG_RW, &VNET_NAME(ip6_ah_net_deflev), 0, 228 "AH tunnel mode default level."); 229 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 230 ecn, CTLFLAG_RW, &VNET_NAME(ip6_ipsec_ecn), 0, 231 "Explicit Congestion Notification handling."); 232 SYSCTL_VNET_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, debug, CTLFLAG_RW, 233 &VNET_NAME(ipsec_debug), 0, 234 "Enable IPsec debugging output when set."); 235 SYSCTL_VNET_PCPUSTAT(_net_inet6_ipsec6, IPSECCTL_STATS, ipsecstats, 236 struct ipsecstat, ipsec6stat, "IPsec IPv6 statistics."); 237 #endif /* INET6 */ 238 239 static int ipsec_setspidx_inpcb(struct mbuf *, struct inpcb *); 240 static int ipsec_setspidx(struct mbuf *, struct secpolicyindex *, int); 241 static void ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 242 static int ipsec4_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 243 #ifdef INET6 244 static void ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 245 static int ipsec6_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 246 #endif 247 static void ipsec_delpcbpolicy(struct inpcbpolicy *); 248 static struct secpolicy *ipsec_deepcopy_policy(struct secpolicy *src); 249 static void vshiftl(unsigned char *, int, int); 250 251 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 252 253 /* 254 * Return a held reference to the default SP. 255 */ 256 static struct secpolicy * 257 key_allocsp_default(const char* where, int tag) 258 { 259 struct secpolicy *sp; 260 261 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 262 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 263 264 sp = &V_ip4_def_policy; 265 if (sp->policy != IPSEC_POLICY_DISCARD && 266 sp->policy != IPSEC_POLICY_NONE) { 267 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 268 sp->policy, IPSEC_POLICY_NONE)); 269 sp->policy = IPSEC_POLICY_NONE; 270 } 271 key_addref(sp); 272 273 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 274 printf("DP key_allocsp_default returns SP:%p (%u)\n", 275 sp, sp->refcnt)); 276 return (sp); 277 } 278 #define KEY_ALLOCSP_DEFAULT() \ 279 key_allocsp_default(__FILE__, __LINE__) 280 281 /* 282 * For OUTBOUND packet having a socket. Searching SPD for packet, 283 * and return a pointer to SP. 284 * OUT: NULL: no apropreate SP found, the following value is set to error. 285 * 0 : bypass 286 * EACCES : discard packet. 287 * ENOENT : ipsec_acquire() in progress, maybe. 288 * others : error occured. 289 * others: a pointer to SP 290 * 291 * NOTE: IPv6 mapped adddress concern is implemented here. 292 */ 293 struct secpolicy * 294 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 295 { 296 struct secpolicy *sp; 297 298 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 299 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 300 ("invalid direction %u", dir)); 301 302 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 303 if (sp == NULL) /*XXX????*/ 304 sp = KEY_ALLOCSP_DEFAULT(); 305 IPSEC_ASSERT(sp != NULL, ("null SP")); 306 return (sp); 307 } 308 309 /* 310 * For OUTBOUND packet having a socket. Searching SPD for packet, 311 * and return a pointer to SP. 312 * OUT: NULL: no apropreate SP found, the following value is set to error. 313 * 0 : bypass 314 * EACCES : discard packet. 315 * ENOENT : ipsec_acquire() in progress, maybe. 316 * others : error occured. 317 * others: a pointer to SP 318 * 319 * NOTE: IPv6 mapped adddress concern is implemented here. 320 */ 321 static struct secpolicy * 322 ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb *inp, int *error) 323 { 324 struct inpcbpolicy *pcbsp; 325 struct secpolicy *currsp = NULL; /* Policy on socket. */ 326 struct secpolicy *sp; 327 328 IPSEC_ASSERT(m != NULL, ("null mbuf")); 329 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 330 IPSEC_ASSERT(error != NULL, ("null error")); 331 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 332 ("invalid direction %u", dir)); 333 334 /* Set spidx in pcb. */ 335 *error = ipsec_setspidx_inpcb(m, inp); 336 if (*error) 337 return (NULL); 338 339 pcbsp = inp->inp_sp; 340 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 341 switch (dir) { 342 case IPSEC_DIR_INBOUND: 343 currsp = pcbsp->sp_in; 344 break; 345 case IPSEC_DIR_OUTBOUND: 346 currsp = pcbsp->sp_out; 347 break; 348 } 349 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 350 351 if (pcbsp->priv) { /* When privilieged socket. */ 352 switch (currsp->policy) { 353 case IPSEC_POLICY_BYPASS: 354 case IPSEC_POLICY_IPSEC: 355 key_addref(currsp); 356 sp = currsp; 357 break; 358 359 case IPSEC_POLICY_ENTRUST: 360 /* Look for a policy in SPD. */ 361 sp = KEY_ALLOCSP(&currsp->spidx, dir); 362 if (sp == NULL) /* No SP found. */ 363 sp = KEY_ALLOCSP_DEFAULT(); 364 break; 365 366 default: 367 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 368 __func__, currsp->policy)); 369 *error = EINVAL; 370 return (NULL); 371 } 372 } else { /* Unpriv, SPD has policy. */ 373 sp = KEY_ALLOCSP(&currsp->spidx, dir); 374 if (sp == NULL) { /* No SP found. */ 375 switch (currsp->policy) { 376 case IPSEC_POLICY_BYPASS: 377 ipseclog((LOG_ERR, "%s: Illegal policy for " 378 "non-priviliged defined %d\n", 379 __func__, currsp->policy)); 380 *error = EINVAL; 381 return (NULL); 382 383 case IPSEC_POLICY_ENTRUST: 384 sp = KEY_ALLOCSP_DEFAULT(); 385 break; 386 387 case IPSEC_POLICY_IPSEC: 388 key_addref(currsp); 389 sp = currsp; 390 break; 391 392 default: 393 ipseclog((LOG_ERR, "%s: Invalid policy for " 394 "PCB %d\n", __func__, currsp->policy)); 395 *error = EINVAL; 396 return (NULL); 397 } 398 } 399 } 400 IPSEC_ASSERT(sp != NULL, 401 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 402 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 403 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 404 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 405 return (sp); 406 } 407 408 /* 409 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 410 * and return a pointer to SP. 411 * OUT: positive: a pointer to the entry for security policy leaf matched. 412 * NULL: no apropreate SP found, the following value is set to error. 413 * 0 : bypass 414 * EACCES : discard packet. 415 * ENOENT : ipsec_acquire() in progress, maybe. 416 * others : error occured. 417 */ 418 struct secpolicy * 419 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 420 { 421 struct secpolicyindex spidx; 422 struct secpolicy *sp; 423 424 IPSEC_ASSERT(m != NULL, ("null mbuf")); 425 IPSEC_ASSERT(error != NULL, ("null error")); 426 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 427 ("invalid direction %u", dir)); 428 429 sp = NULL; 430 if (key_havesp(dir)) { 431 /* Make an index to look for a policy. */ 432 *error = ipsec_setspidx(m, &spidx, 433 (flag & IP_FORWARDING) ? 0 : 1); 434 if (*error != 0) { 435 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 436 __func__, dir, flag)); 437 return (NULL); 438 } 439 spidx.dir = dir; 440 441 sp = KEY_ALLOCSP(&spidx, dir); 442 } 443 if (sp == NULL) /* No SP found, use system default. */ 444 sp = KEY_ALLOCSP_DEFAULT(); 445 IPSEC_ASSERT(sp != NULL, ("null SP")); 446 return (sp); 447 } 448 449 struct secpolicy * 450 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 451 struct inpcb *inp) 452 { 453 struct secpolicy *sp; 454 455 *error = 0; 456 if (inp == NULL) 457 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 458 else 459 sp = ipsec_getpolicybysock(m, dir, inp, error); 460 if (sp == NULL) { 461 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 462 IPSECSTAT_INC(ips_out_inval); 463 return (NULL); 464 } 465 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 466 switch (sp->policy) { 467 case IPSEC_POLICY_ENTRUST: 468 default: 469 printf("%s: invalid policy %u\n", __func__, sp->policy); 470 /* FALLTHROUGH */ 471 case IPSEC_POLICY_DISCARD: 472 IPSECSTAT_INC(ips_out_polvio); 473 *error = -EINVAL; /* Packet is discarded by caller. */ 474 break; 475 case IPSEC_POLICY_BYPASS: 476 case IPSEC_POLICY_NONE: 477 KEY_FREESP(&sp); 478 sp = NULL; /* NB: force NULL result. */ 479 break; 480 case IPSEC_POLICY_IPSEC: 481 if (sp->req == NULL) /* Acquire a SA. */ 482 *error = key_spdacquire(sp); 483 break; 484 } 485 if (*error != 0) { 486 KEY_FREESP(&sp); 487 sp = NULL; 488 } 489 return (sp); 490 } 491 492 static int 493 ipsec_setspidx_inpcb(struct mbuf *m, struct inpcb *inp) 494 { 495 int error; 496 497 IPSEC_ASSERT(inp != NULL, ("null inp")); 498 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 499 IPSEC_ASSERT(inp->inp_sp->sp_out != NULL && inp->inp_sp->sp_in != NULL, 500 ("null sp_in || sp_out")); 501 502 error = ipsec_setspidx(m, &inp->inp_sp->sp_in->spidx, 1); 503 if (error == 0) { 504 inp->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 505 inp->inp_sp->sp_out->spidx = inp->inp_sp->sp_in->spidx; 506 inp->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 507 } else { 508 bzero(&inp->inp_sp->sp_in->spidx, 509 sizeof (inp->inp_sp->sp_in->spidx)); 510 bzero(&inp->inp_sp->sp_out->spidx, 511 sizeof (inp->inp_sp->sp_in->spidx)); 512 } 513 return (error); 514 } 515 516 /* 517 * Configure security policy index (src/dst/proto/sport/dport) 518 * by looking at the content of mbuf. 519 * The caller is responsible for error recovery (like clearing up spidx). 520 */ 521 static int 522 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 523 { 524 struct ip *ip = NULL; 525 struct ip ipbuf; 526 u_int v; 527 struct mbuf *n; 528 int len; 529 int error; 530 531 IPSEC_ASSERT(m != NULL, ("null mbuf")); 532 533 /* 534 * Validate m->m_pkthdr.len. We see incorrect length if we 535 * mistakenly call this function with inconsistent mbuf chain 536 * (like 4.4BSD tcp/udp processing). XXX Should we panic here? 537 */ 538 len = 0; 539 for (n = m; n; n = n->m_next) 540 len += n->m_len; 541 if (m->m_pkthdr.len != len) { 542 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 543 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 544 __func__, len, m->m_pkthdr.len)); 545 return (EINVAL); 546 } 547 548 if (m->m_pkthdr.len < sizeof(struct ip)) { 549 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 550 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 551 __func__, m->m_pkthdr.len)); 552 return (EINVAL); 553 } 554 555 if (m->m_len >= sizeof(*ip)) 556 ip = mtod(m, struct ip *); 557 else { 558 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 559 ip = &ipbuf; 560 } 561 v = ip->ip_v; 562 switch (v) { 563 case 4: 564 error = ipsec4_setspidx_ipaddr(m, spidx); 565 if (error) 566 return (error); 567 ipsec4_get_ulp(m, spidx, needport); 568 return (0); 569 #ifdef INET6 570 case 6: 571 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 572 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 573 printf("%s: pkthdr len(%d) too small (v6), " 574 "ignored\n", __func__, m->m_pkthdr.len)); 575 return (EINVAL); 576 } 577 error = ipsec6_setspidx_ipaddr(m, spidx); 578 if (error) 579 return (error); 580 ipsec6_get_ulp(m, spidx, needport); 581 return (0); 582 #endif 583 default: 584 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 585 printf("%s: " "unknown IP version %u, ignored.\n", 586 __func__, v)); 587 return (EINVAL); 588 } 589 } 590 591 static void 592 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 593 { 594 u_int8_t nxt; 595 int off; 596 597 /* Sanity check. */ 598 IPSEC_ASSERT(m != NULL, ("null mbuf")); 599 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 600 601 if (m->m_len >= sizeof (struct ip)) { 602 struct ip *ip = mtod(m, struct ip *); 603 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) 604 goto done; 605 off = ip->ip_hl << 2; 606 nxt = ip->ip_p; 607 } else { 608 struct ip ih; 609 610 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 611 if (ih.ip_off & htons(IP_MF | IP_OFFMASK)) 612 goto done; 613 off = ih.ip_hl << 2; 614 nxt = ih.ip_p; 615 } 616 617 while (off < m->m_pkthdr.len) { 618 struct ip6_ext ip6e; 619 struct tcphdr th; 620 struct udphdr uh; 621 622 switch (nxt) { 623 case IPPROTO_TCP: 624 spidx->ul_proto = nxt; 625 if (!needport) 626 goto done_proto; 627 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 628 goto done; 629 m_copydata(m, off, sizeof (th), (caddr_t) &th); 630 spidx->src.sin.sin_port = th.th_sport; 631 spidx->dst.sin.sin_port = th.th_dport; 632 return; 633 case IPPROTO_UDP: 634 spidx->ul_proto = nxt; 635 if (!needport) 636 goto done_proto; 637 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 638 goto done; 639 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 640 spidx->src.sin.sin_port = uh.uh_sport; 641 spidx->dst.sin.sin_port = uh.uh_dport; 642 return; 643 case IPPROTO_AH: 644 if (off + sizeof(ip6e) > m->m_pkthdr.len) 645 goto done; 646 /* XXX Sigh, this works but is totally bogus. */ 647 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 648 off += (ip6e.ip6e_len + 2) << 2; 649 nxt = ip6e.ip6e_nxt; 650 break; 651 case IPPROTO_ICMP: 652 default: 653 /* XXX Intermediate headers??? */ 654 spidx->ul_proto = nxt; 655 goto done_proto; 656 } 657 } 658 done: 659 spidx->ul_proto = IPSEC_ULPROTO_ANY; 660 done_proto: 661 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 662 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 663 } 664 665 /* Assumes that m is sane. */ 666 static int 667 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 668 { 669 static const struct sockaddr_in template = { 670 sizeof (struct sockaddr_in), 671 AF_INET, 672 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 673 }; 674 675 spidx->src.sin = template; 676 spidx->dst.sin = template; 677 678 if (m->m_len < sizeof (struct ip)) { 679 m_copydata(m, offsetof(struct ip, ip_src), 680 sizeof (struct in_addr), 681 (caddr_t) &spidx->src.sin.sin_addr); 682 m_copydata(m, offsetof(struct ip, ip_dst), 683 sizeof (struct in_addr), 684 (caddr_t) &spidx->dst.sin.sin_addr); 685 } else { 686 struct ip *ip = mtod(m, struct ip *); 687 spidx->src.sin.sin_addr = ip->ip_src; 688 spidx->dst.sin.sin_addr = ip->ip_dst; 689 } 690 691 spidx->prefs = sizeof(struct in_addr) << 3; 692 spidx->prefd = sizeof(struct in_addr) << 3; 693 694 return (0); 695 } 696 697 #ifdef INET6 698 static void 699 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 700 { 701 int off, nxt; 702 struct tcphdr th; 703 struct udphdr uh; 704 struct icmp6_hdr ih; 705 706 /* Sanity check. */ 707 if (m == NULL) 708 panic("%s: NULL pointer was passed.\n", __func__); 709 710 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 711 printf("%s:\n", __func__); kdebug_mbuf(m)); 712 713 /* Set default. */ 714 spidx->ul_proto = IPSEC_ULPROTO_ANY; 715 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 716 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 717 718 nxt = -1; 719 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 720 if (off < 0 || m->m_pkthdr.len < off) 721 return; 722 723 switch (nxt) { 724 case IPPROTO_TCP: 725 spidx->ul_proto = nxt; 726 if (!needport) 727 break; 728 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 729 break; 730 m_copydata(m, off, sizeof(th), (caddr_t)&th); 731 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 732 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 733 break; 734 case IPPROTO_UDP: 735 spidx->ul_proto = nxt; 736 if (!needport) 737 break; 738 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 739 break; 740 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 741 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 742 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 743 break; 744 case IPPROTO_ICMPV6: 745 spidx->ul_proto = nxt; 746 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 747 break; 748 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 749 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 750 htons((uint16_t)ih.icmp6_type); 751 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 752 htons((uint16_t)ih.icmp6_code); 753 break; 754 default: 755 /* XXX Intermediate headers??? */ 756 spidx->ul_proto = nxt; 757 break; 758 } 759 } 760 761 /* Assumes that m is sane. */ 762 static int 763 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 764 { 765 struct ip6_hdr *ip6 = NULL; 766 struct ip6_hdr ip6buf; 767 struct sockaddr_in6 *sin6; 768 769 if (m->m_len >= sizeof(*ip6)) 770 ip6 = mtod(m, struct ip6_hdr *); 771 else { 772 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 773 ip6 = &ip6buf; 774 } 775 776 sin6 = (struct sockaddr_in6 *)&spidx->src; 777 bzero(sin6, sizeof(*sin6)); 778 sin6->sin6_family = AF_INET6; 779 sin6->sin6_len = sizeof(struct sockaddr_in6); 780 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 781 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 782 sin6->sin6_addr.s6_addr16[1] = 0; 783 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 784 } 785 spidx->prefs = sizeof(struct in6_addr) << 3; 786 787 sin6 = (struct sockaddr_in6 *)&spidx->dst; 788 bzero(sin6, sizeof(*sin6)); 789 sin6->sin6_family = AF_INET6; 790 sin6->sin6_len = sizeof(struct sockaddr_in6); 791 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 792 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 793 sin6->sin6_addr.s6_addr16[1] = 0; 794 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 795 } 796 spidx->prefd = sizeof(struct in6_addr) << 3; 797 798 return (0); 799 } 800 #endif 801 802 static void 803 ipsec_delpcbpolicy(struct inpcbpolicy *p) 804 { 805 806 free(p, M_IPSEC_INPCB); 807 } 808 809 /* Initialize policy in PCB. */ 810 int 811 ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp) 812 { 813 struct inpcbpolicy *new; 814 815 /* Sanity check. */ 816 if (so == NULL || pcb_sp == NULL) 817 panic("%s: NULL pointer was passed.\n", __func__); 818 819 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 820 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 821 if (new == NULL) { 822 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 823 return (ENOBUFS); 824 } 825 826 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 827 828 if ((new->sp_in = KEY_NEWSP()) == NULL) { 829 ipsec_delpcbpolicy(new); 830 return (ENOBUFS); 831 } 832 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 833 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 834 835 if ((new->sp_out = KEY_NEWSP()) == NULL) { 836 KEY_FREESP(&new->sp_in); 837 ipsec_delpcbpolicy(new); 838 return (ENOBUFS); 839 } 840 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 841 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 842 843 *pcb_sp = new; 844 845 return (0); 846 } 847 848 /* Copy old IPsec policy into new. */ 849 int 850 ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new) 851 { 852 struct secpolicy *sp; 853 854 sp = ipsec_deepcopy_policy(old->sp_in); 855 if (sp) { 856 KEY_FREESP(&new->sp_in); 857 new->sp_in = sp; 858 } else 859 return (ENOBUFS); 860 861 sp = ipsec_deepcopy_policy(old->sp_out); 862 if (sp) { 863 KEY_FREESP(&new->sp_out); 864 new->sp_out = sp; 865 } else 866 return (ENOBUFS); 867 868 new->priv = old->priv; 869 870 return (0); 871 } 872 873 struct ipsecrequest * 874 ipsec_newisr(void) 875 { 876 struct ipsecrequest *p; 877 878 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 879 if (p != NULL) 880 IPSECREQUEST_LOCK_INIT(p); 881 return (p); 882 } 883 884 void 885 ipsec_delisr(struct ipsecrequest *p) 886 { 887 888 IPSECREQUEST_LOCK_DESTROY(p); 889 free(p, M_IPSEC_SR); 890 } 891 892 /* Deep-copy a policy in PCB. */ 893 static struct secpolicy * 894 ipsec_deepcopy_policy(struct secpolicy *src) 895 { 896 struct ipsecrequest *newchain = NULL; 897 struct ipsecrequest *p; 898 struct ipsecrequest **q; 899 struct ipsecrequest *r; 900 struct secpolicy *dst; 901 902 if (src == NULL) 903 return (NULL); 904 dst = KEY_NEWSP(); 905 if (dst == NULL) 906 return (NULL); 907 908 /* 909 * Deep-copy IPsec request chain. This is required since struct 910 * ipsecrequest is not reference counted. 911 */ 912 q = &newchain; 913 for (p = src->req; p; p = p->next) { 914 *q = ipsec_newisr(); 915 if (*q == NULL) 916 goto fail; 917 (*q)->saidx.proto = p->saidx.proto; 918 (*q)->saidx.mode = p->saidx.mode; 919 (*q)->level = p->level; 920 (*q)->saidx.reqid = p->saidx.reqid; 921 922 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 923 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 924 925 (*q)->sp = dst; 926 927 q = &((*q)->next); 928 } 929 930 dst->req = newchain; 931 dst->state = src->state; 932 dst->policy = src->policy; 933 /* Do not touch the refcnt fields. */ 934 935 return (dst); 936 937 fail: 938 for (p = newchain; p; p = r) { 939 r = p->next; 940 ipsec_delisr(p); 941 p = NULL; 942 } 943 KEY_FREESP(&dst); 944 return (NULL); 945 } 946 947 /* Set policy and IPsec request if present. */ 948 static int 949 ipsec_set_policy_internal(struct secpolicy **pcb_sp, int optname, 950 caddr_t request, size_t len, struct ucred *cred) 951 { 952 struct sadb_x_policy *xpl; 953 struct secpolicy *newsp = NULL; 954 int error; 955 956 /* Sanity check. */ 957 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 958 return (EINVAL); 959 if (len < sizeof(*xpl)) 960 return (EINVAL); 961 xpl = (struct sadb_x_policy *)request; 962 963 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 964 printf("%s: passed policy\n", __func__); 965 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 966 967 /* Check policy type. */ 968 /* ipsec_set_policy_internal() accepts IPSEC, ENTRUST and BYPASS. */ 969 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 970 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 971 return (EINVAL); 972 973 /* Check privileged socket. */ 974 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 975 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0); 976 if (error) 977 return (EACCES); 978 } 979 980 /* Allocating new SP entry. */ 981 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 982 return (error); 983 984 newsp->state = IPSEC_SPSTATE_ALIVE; 985 986 /* Clear old SP and set new SP. */ 987 KEY_FREESP(pcb_sp); 988 *pcb_sp = newsp; 989 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 990 printf("%s: new policy\n", __func__); 991 kdebug_secpolicy(newsp)); 992 993 return (0); 994 } 995 996 int 997 ipsec_set_policy(struct inpcb *inp, int optname, caddr_t request, 998 size_t len, struct ucred *cred) 999 { 1000 struct sadb_x_policy *xpl; 1001 struct secpolicy **pcb_sp; 1002 1003 /* Sanity check. */ 1004 if (inp == NULL || request == NULL) 1005 return (EINVAL); 1006 if (len < sizeof(*xpl)) 1007 return (EINVAL); 1008 xpl = (struct sadb_x_policy *)request; 1009 1010 /* Select direction. */ 1011 switch (xpl->sadb_x_policy_dir) { 1012 case IPSEC_DIR_INBOUND: 1013 pcb_sp = &inp->inp_sp->sp_in; 1014 break; 1015 case IPSEC_DIR_OUTBOUND: 1016 pcb_sp = &inp->inp_sp->sp_out; 1017 break; 1018 default: 1019 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1020 xpl->sadb_x_policy_dir)); 1021 return (EINVAL); 1022 } 1023 1024 return (ipsec_set_policy_internal(pcb_sp, optname, request, len, cred)); 1025 } 1026 1027 int 1028 ipsec_get_policy(struct inpcb *inp, caddr_t request, size_t len, 1029 struct mbuf **mp) 1030 { 1031 struct sadb_x_policy *xpl; 1032 struct secpolicy *pcb_sp; 1033 1034 /* Sanity check. */ 1035 if (inp == NULL || request == NULL || mp == NULL) 1036 return (EINVAL); 1037 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1038 if (len < sizeof(*xpl)) 1039 return (EINVAL); 1040 xpl = (struct sadb_x_policy *)request; 1041 1042 /* Select direction. */ 1043 switch (xpl->sadb_x_policy_dir) { 1044 case IPSEC_DIR_INBOUND: 1045 pcb_sp = inp->inp_sp->sp_in; 1046 break; 1047 case IPSEC_DIR_OUTBOUND: 1048 pcb_sp = inp->inp_sp->sp_out; 1049 break; 1050 default: 1051 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1052 xpl->sadb_x_policy_dir)); 1053 return (EINVAL); 1054 } 1055 1056 /* Sanity check. Should be an IPSEC_ASSERT. */ 1057 if (pcb_sp == NULL) 1058 return (EINVAL); 1059 1060 *mp = key_sp2msg(pcb_sp); 1061 if (!*mp) { 1062 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1063 return (ENOBUFS); 1064 } 1065 1066 (*mp)->m_type = MT_DATA; 1067 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1068 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1069 1070 return (0); 1071 } 1072 1073 /* Delete policy in PCB. */ 1074 int 1075 ipsec_delete_pcbpolicy(struct inpcb *inp) 1076 { 1077 IPSEC_ASSERT(inp != NULL, ("null inp")); 1078 1079 if (inp->inp_sp == NULL) 1080 return (0); 1081 1082 if (inp->inp_sp->sp_in != NULL) 1083 KEY_FREESP(&inp->inp_sp->sp_in); 1084 1085 if (inp->inp_sp->sp_out != NULL) 1086 KEY_FREESP(&inp->inp_sp->sp_out); 1087 1088 ipsec_delpcbpolicy(inp->inp_sp); 1089 inp->inp_sp = NULL; 1090 1091 return (0); 1092 } 1093 1094 /* 1095 * Return current level. 1096 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1097 */ 1098 u_int 1099 ipsec_get_reqlevel(struct ipsecrequest *isr) 1100 { 1101 u_int level = 0; 1102 u_int esp_trans_deflev, esp_net_deflev; 1103 u_int ah_trans_deflev, ah_net_deflev; 1104 1105 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1106 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1107 ("af family mismatch, src %u, dst %u", 1108 isr->sp->spidx.src.sa.sa_family, 1109 isr->sp->spidx.dst.sa.sa_family)); 1110 1111 /* XXX Note that we have ipseclog() expanded here - code sync issue. */ 1112 #define IPSEC_CHECK_DEFAULT(lev) \ 1113 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1114 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1115 ? (V_ipsec_debug \ 1116 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1117 (lev), IPSEC_LEVEL_REQUIRE) \ 1118 : 0), \ 1119 (lev) = IPSEC_LEVEL_REQUIRE, \ 1120 (lev) \ 1121 : (lev)) 1122 1123 /* Set default level. */ 1124 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1125 #ifdef INET 1126 case AF_INET: 1127 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_trans_deflev); 1128 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_net_deflev); 1129 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_trans_deflev); 1130 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_net_deflev); 1131 break; 1132 #endif 1133 #ifdef INET6 1134 case AF_INET6: 1135 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_trans_deflev); 1136 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_net_deflev); 1137 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_trans_deflev); 1138 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_net_deflev); 1139 break; 1140 #endif /* INET6 */ 1141 default: 1142 panic("%s: unknown af %u", 1143 __func__, isr->sp->spidx.src.sa.sa_family); 1144 } 1145 1146 #undef IPSEC_CHECK_DEFAULT 1147 1148 /* Set level. */ 1149 switch (isr->level) { 1150 case IPSEC_LEVEL_DEFAULT: 1151 switch (isr->saidx.proto) { 1152 case IPPROTO_ESP: 1153 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1154 level = esp_net_deflev; 1155 else 1156 level = esp_trans_deflev; 1157 break; 1158 case IPPROTO_AH: 1159 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1160 level = ah_net_deflev; 1161 else 1162 level = ah_trans_deflev; 1163 break; 1164 case IPPROTO_IPCOMP: 1165 /* 1166 * We don't really care, as IPcomp document says that 1167 * we shouldn't compress small packets. 1168 */ 1169 level = IPSEC_LEVEL_USE; 1170 break; 1171 default: 1172 panic("%s: Illegal protocol defined %u\n", __func__, 1173 isr->saidx.proto); 1174 } 1175 break; 1176 1177 case IPSEC_LEVEL_USE: 1178 case IPSEC_LEVEL_REQUIRE: 1179 level = isr->level; 1180 break; 1181 case IPSEC_LEVEL_UNIQUE: 1182 level = IPSEC_LEVEL_REQUIRE; 1183 break; 1184 1185 default: 1186 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1187 } 1188 1189 return (level); 1190 } 1191 1192 /* 1193 * Check security policy requirements against the actual 1194 * packet contents. Return one if the packet should be 1195 * reject as "invalid"; otherwiser return zero to have the 1196 * packet treated as "valid". 1197 * 1198 * OUT: 1199 * 0: valid 1200 * 1: invalid 1201 */ 1202 int 1203 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1204 { 1205 struct ipsecrequest *isr; 1206 int need_auth; 1207 1208 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1209 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1210 1211 /* Check policy. */ 1212 switch (sp->policy) { 1213 case IPSEC_POLICY_DISCARD: 1214 return (1); 1215 case IPSEC_POLICY_BYPASS: 1216 case IPSEC_POLICY_NONE: 1217 return (0); 1218 } 1219 1220 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1221 ("invalid policy %u", sp->policy)); 1222 1223 /* XXX Should compare policy against IPsec header history. */ 1224 1225 need_auth = 0; 1226 for (isr = sp->req; isr != NULL; isr = isr->next) { 1227 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1228 continue; 1229 switch (isr->saidx.proto) { 1230 case IPPROTO_ESP: 1231 if ((m->m_flags & M_DECRYPTED) == 0) { 1232 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1233 printf("%s: ESP m_flags:%x\n", __func__, 1234 m->m_flags)); 1235 return (1); 1236 } 1237 1238 if (!need_auth && 1239 isr->sav != NULL && 1240 isr->sav->tdb_authalgxform != NULL && 1241 (m->m_flags & M_AUTHIPDGM) == 0) { 1242 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1243 printf("%s: ESP/AH m_flags:%x\n", __func__, 1244 m->m_flags)); 1245 return (1); 1246 } 1247 break; 1248 case IPPROTO_AH: 1249 need_auth = 1; 1250 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1251 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1252 printf("%s: AH m_flags:%x\n", __func__, 1253 m->m_flags)); 1254 return (1); 1255 } 1256 break; 1257 case IPPROTO_IPCOMP: 1258 /* 1259 * We don't really care, as IPcomp document 1260 * says that we shouldn't compress small 1261 * packets. IPComp policy should always be 1262 * treated as being in "use" level. 1263 */ 1264 break; 1265 } 1266 } 1267 return (0); /* Valid. */ 1268 } 1269 1270 static int 1271 ipsec46_in_reject(struct mbuf *m, struct inpcb *inp) 1272 { 1273 struct secpolicy *sp; 1274 int error; 1275 int result; 1276 1277 if (!key_havesp(IPSEC_DIR_INBOUND)) 1278 return 0; 1279 1280 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1281 1282 /* 1283 * Get SP for this packet. 1284 * When we are called from ip_forward(), we call 1285 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1286 */ 1287 if (inp == NULL) 1288 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1289 else 1290 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1291 1292 if (sp != NULL) { 1293 result = ipsec_in_reject(sp, m); 1294 KEY_FREESP(&sp); 1295 } else { 1296 result = 0; /* XXX Should be panic? 1297 * -> No, there may be error. */ 1298 } 1299 return (result); 1300 } 1301 1302 /* 1303 * Check AH/ESP integrity. 1304 * This function is called from tcp_input(), udp_input(), 1305 * and {ah,esp}4_input for tunnel mode. 1306 */ 1307 int 1308 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp) 1309 { 1310 int result; 1311 1312 result = ipsec46_in_reject(m, inp); 1313 if (result) 1314 IPSECSTAT_INC(ips_in_polvio); 1315 1316 return (result); 1317 } 1318 1319 #ifdef INET6 1320 /* 1321 * Check AH/ESP integrity. 1322 * This function is called from tcp6_input(), udp6_input(), 1323 * and {ah,esp}6_input for tunnel mode. 1324 */ 1325 int 1326 ipsec6_in_reject(struct mbuf *m, struct inpcb *inp) 1327 { 1328 int result; 1329 1330 result = ipsec46_in_reject(m, inp); 1331 if (result) 1332 IPSEC6STAT_INC(ips_in_polvio); 1333 1334 return (result); 1335 } 1336 #endif 1337 1338 /* 1339 * Compute the byte size to be occupied by IPsec header. 1340 * In case it is tunnelled, it includes the size of outer IP header. 1341 * NOTE: SP passed is freed in this function. 1342 */ 1343 static size_t 1344 ipsec_hdrsiz_internal(struct secpolicy *sp) 1345 { 1346 struct ipsecrequest *isr; 1347 size_t size; 1348 1349 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1350 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1351 1352 switch (sp->policy) { 1353 case IPSEC_POLICY_DISCARD: 1354 case IPSEC_POLICY_BYPASS: 1355 case IPSEC_POLICY_NONE: 1356 return (0); 1357 } 1358 1359 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1360 ("invalid policy %u", sp->policy)); 1361 1362 size = 0; 1363 for (isr = sp->req; isr != NULL; isr = isr->next) { 1364 size_t clen = 0; 1365 1366 switch (isr->saidx.proto) { 1367 case IPPROTO_ESP: 1368 clen = esp_hdrsiz(isr->sav); 1369 break; 1370 case IPPROTO_AH: 1371 clen = ah_hdrsiz(isr->sav); 1372 break; 1373 case IPPROTO_IPCOMP: 1374 clen = sizeof(struct ipcomp); 1375 break; 1376 } 1377 1378 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1379 switch (isr->saidx.dst.sa.sa_family) { 1380 case AF_INET: 1381 clen += sizeof(struct ip); 1382 break; 1383 #ifdef INET6 1384 case AF_INET6: 1385 clen += sizeof(struct ip6_hdr); 1386 break; 1387 #endif 1388 default: 1389 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1390 "IPsec tunnel SA\n", __func__, 1391 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1392 break; 1393 } 1394 } 1395 size += clen; 1396 } 1397 1398 return (size); 1399 } 1400 1401 /* 1402 * This function is called from ipsec_hdrsiz_tcp(), ip_ipsec_mtu(), 1403 * disabled ip6_ipsec_mtu() and ip6_forward(). 1404 */ 1405 size_t 1406 ipsec_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp) 1407 { 1408 struct secpolicy *sp; 1409 int error; 1410 size_t size; 1411 1412 if (!key_havesp(dir)) 1413 return 0; 1414 1415 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1416 1417 /* Get SP for this packet. 1418 * When we are called from ip_forward(), we call 1419 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1420 */ 1421 if (inp == NULL) 1422 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1423 else 1424 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1425 1426 if (sp != NULL) { 1427 size = ipsec_hdrsiz_internal(sp); 1428 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1429 printf("%s: size:%lu.\n", __func__, 1430 (unsigned long)size)); 1431 1432 KEY_FREESP(&sp); 1433 } else { 1434 size = 0; /* XXX Should be panic? 1435 * -> No, we are called w/o knowing if 1436 * IPsec processing is needed. */ 1437 } 1438 return (size); 1439 } 1440 1441 /* 1442 * Check the variable replay window. 1443 * ipsec_chkreplay() performs replay check before ICV verification. 1444 * ipsec_updatereplay() updates replay bitmap. This must be called after 1445 * ICV verification (it also performs replay check, which is usually done 1446 * beforehand). 1447 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1448 * 1449 * Based on RFC 2401. 1450 */ 1451 int 1452 ipsec_chkreplay(u_int32_t seq, struct secasvar *sav) 1453 { 1454 const struct secreplay *replay; 1455 u_int32_t diff; 1456 int fr; 1457 u_int32_t wsizeb; /* Constant: bits of window size. */ 1458 int frlast; /* Constant: last frame. */ 1459 1460 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1461 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1462 1463 replay = sav->replay; 1464 1465 if (replay->wsize == 0) 1466 return (1); /* No need to check replay. */ 1467 1468 /* Constant. */ 1469 frlast = replay->wsize - 1; 1470 wsizeb = replay->wsize << 3; 1471 1472 /* Sequence number of 0 is invalid. */ 1473 if (seq == 0) 1474 return (0); 1475 1476 /* First time is always okay. */ 1477 if (replay->count == 0) 1478 return (1); 1479 1480 if (seq > replay->lastseq) { 1481 /* Larger sequences are okay. */ 1482 return (1); 1483 } else { 1484 /* seq is equal or less than lastseq. */ 1485 diff = replay->lastseq - seq; 1486 1487 /* Over range to check, i.e. too old or wrapped. */ 1488 if (diff >= wsizeb) 1489 return (0); 1490 1491 fr = frlast - diff / 8; 1492 1493 /* This packet already seen? */ 1494 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1495 return (0); 1496 1497 /* Out of order but good. */ 1498 return (1); 1499 } 1500 } 1501 1502 /* 1503 * Check replay counter whether to update or not. 1504 * OUT: 0: OK 1505 * 1: NG 1506 */ 1507 int 1508 ipsec_updatereplay(u_int32_t seq, struct secasvar *sav) 1509 { 1510 struct secreplay *replay; 1511 u_int32_t diff; 1512 int fr; 1513 u_int32_t wsizeb; /* Constant: bits of window size. */ 1514 int frlast; /* Constant: last frame. */ 1515 1516 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1517 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1518 1519 replay = sav->replay; 1520 1521 if (replay->wsize == 0) 1522 goto ok; /* No need to check replay. */ 1523 1524 /* Constant. */ 1525 frlast = replay->wsize - 1; 1526 wsizeb = replay->wsize << 3; 1527 1528 /* Sequence number of 0 is invalid. */ 1529 if (seq == 0) 1530 return (1); 1531 1532 /* First time. */ 1533 if (replay->count == 0) { 1534 replay->lastseq = seq; 1535 bzero(replay->bitmap, replay->wsize); 1536 (replay->bitmap)[frlast] = 1; 1537 goto ok; 1538 } 1539 1540 if (seq > replay->lastseq) { 1541 /* seq is larger than lastseq. */ 1542 diff = seq - replay->lastseq; 1543 1544 /* New larger sequence number. */ 1545 if (diff < wsizeb) { 1546 /* In window. */ 1547 /* Set bit for this packet. */ 1548 vshiftl(replay->bitmap, diff, replay->wsize); 1549 (replay->bitmap)[frlast] |= 1; 1550 } else { 1551 /* This packet has a "way larger". */ 1552 bzero(replay->bitmap, replay->wsize); 1553 (replay->bitmap)[frlast] = 1; 1554 } 1555 replay->lastseq = seq; 1556 1557 /* Larger is good. */ 1558 } else { 1559 /* seq is equal or less than lastseq. */ 1560 diff = replay->lastseq - seq; 1561 1562 /* Over range to check, i.e. too old or wrapped. */ 1563 if (diff >= wsizeb) 1564 return (1); 1565 1566 fr = frlast - diff / 8; 1567 1568 /* This packet already seen? */ 1569 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1570 return (1); 1571 1572 /* Mark as seen. */ 1573 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1574 1575 /* Out of order but good. */ 1576 } 1577 1578 ok: 1579 if (replay->count == ~0) { 1580 1581 /* Set overflow flag. */ 1582 replay->overflow++; 1583 1584 /* Don't increment, no more packets accepted. */ 1585 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1586 return (1); 1587 1588 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1589 __func__, replay->overflow, ipsec_logsastr(sav))); 1590 } 1591 1592 replay->count++; 1593 1594 return (0); 1595 } 1596 1597 /* 1598 * Shift variable length buffer to left. 1599 * IN: bitmap: pointer to the buffer 1600 * nbit: the number of to shift. 1601 * wsize: buffer size (bytes). 1602 */ 1603 static void 1604 vshiftl(unsigned char *bitmap, int nbit, int wsize) 1605 { 1606 int s, j, i; 1607 unsigned char over; 1608 1609 for (j = 0; j < nbit; j += 8) { 1610 s = (nbit - j < 8) ? (nbit - j): 8; 1611 bitmap[0] <<= s; 1612 for (i = 1; i < wsize; i++) { 1613 over = (bitmap[i] >> (8 - s)); 1614 bitmap[i] <<= s; 1615 bitmap[i-1] |= over; 1616 } 1617 } 1618 } 1619 1620 #ifdef INET 1621 /* Return a printable string for the IPv4 address. */ 1622 static char * 1623 inet_ntoa4(struct in_addr ina) 1624 { 1625 static char buf[4][4 * sizeof "123" + 4]; 1626 unsigned char *ucp = (unsigned char *) &ina; 1627 static int i = 3; 1628 1629 /* XXX-BZ Returns static buffer. */ 1630 i = (i + 1) % 4; 1631 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1632 ucp[2] & 0xff, ucp[3] & 0xff); 1633 return (buf[i]); 1634 } 1635 #endif 1636 1637 /* Return a printable string for the address. */ 1638 char * 1639 ipsec_address(union sockaddr_union* sa) 1640 { 1641 #ifdef INET6 1642 char ip6buf[INET6_ADDRSTRLEN]; 1643 #endif 1644 1645 switch (sa->sa.sa_family) { 1646 #ifdef INET 1647 case AF_INET: 1648 return (inet_ntoa4(sa->sin.sin_addr)); 1649 #endif /* INET */ 1650 #ifdef INET6 1651 case AF_INET6: 1652 return (ip6_sprintf(ip6buf, &sa->sin6.sin6_addr)); 1653 #endif /* INET6 */ 1654 default: 1655 return ("(unknown address family)"); 1656 } 1657 } 1658 1659 const char * 1660 ipsec_logsastr(struct secasvar *sav) 1661 { 1662 static char buf[256]; 1663 char *p; 1664 struct secasindex *saidx = &sav->sah->saidx; 1665 1666 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1667 ("address family mismatch")); 1668 1669 p = buf; 1670 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1671 while (p && *p) 1672 p++; 1673 /* NB: only use ipsec_address on one address at a time. */ 1674 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1675 ipsec_address(&saidx->src)); 1676 while (p && *p) 1677 p++; 1678 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1679 ipsec_address(&saidx->dst)); 1680 1681 return (buf); 1682 } 1683 1684 void 1685 ipsec_dumpmbuf(struct mbuf *m) 1686 { 1687 int totlen; 1688 int i; 1689 u_char *p; 1690 1691 totlen = 0; 1692 printf("---\n"); 1693 while (m) { 1694 p = mtod(m, u_char *); 1695 for (i = 0; i < m->m_len; i++) { 1696 printf("%02x ", p[i]); 1697 totlen++; 1698 if (totlen % 16 == 0) 1699 printf("\n"); 1700 } 1701 m = m->m_next; 1702 } 1703 if (totlen % 16 != 0) 1704 printf("\n"); 1705 printf("---\n"); 1706 } 1707 1708 static void 1709 ipsec_init(const void *unused __unused) 1710 { 1711 1712 SECPOLICY_LOCK_INIT(&V_ip4_def_policy); 1713 V_ip4_def_policy.refcnt = 1; /* NB: disallow free. */ 1714 } 1715 VNET_SYSINIT(ipsec_init, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, ipsec_init, 1716 NULL); 1717 1718 1719 /* XXX This stuff doesn't belong here... */ 1720 1721 static struct xformsw* xforms = NULL; 1722 1723 /* 1724 * Register a transform; typically at system startup. 1725 */ 1726 void 1727 xform_register(struct xformsw* xsp) 1728 { 1729 1730 xsp->xf_next = xforms; 1731 xforms = xsp; 1732 } 1733 1734 /* 1735 * Initialize transform support in an sav. 1736 */ 1737 int 1738 xform_init(struct secasvar *sav, int xftype) 1739 { 1740 struct xformsw *xsp; 1741 1742 if (sav->tdb_xform != NULL) /* Previously initialized. */ 1743 return (0); 1744 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1745 if (xsp->xf_type == xftype) 1746 return ((*xsp->xf_init)(sav, xsp)); 1747 return (EINVAL); 1748 }
Cache object: c0b33ac21ecf79038b343987a5437a81
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