ip_auth.c revision 1.5.26.1
1 /* $NetBSD: ip_auth.c,v 1.5.26.1 2018/05/21 04:36:14 pgoyette Exp $ */ 2 3 /* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 */ 8 #if defined(KERNEL) || defined(_KERNEL) 9 # undef KERNEL 10 # undef _KERNEL 11 # define KERNEL 1 12 # define _KERNEL 1 13 #endif 14 #if defined(__NetBSD__) 15 #include <sys/cdefs.h> 16 #endif 17 #include <sys/errno.h> 18 #include <sys/types.h> 19 #include <sys/param.h> 20 #include <sys/time.h> 21 #include <sys/file.h> 22 #if !defined(_KERNEL) 23 # include <stdio.h> 24 # include <stdlib.h> 25 # ifdef _STDC_C99 26 # include <stdbool.h> 27 # endif 28 # include <string.h> 29 # define _KERNEL 30 # ifdef __OpenBSD__ 31 struct file; 32 # endif 33 # include <sys/uio.h> 34 # undef _KERNEL 35 #endif 36 #if defined(_KERNEL) && (__FreeBSD_version >= 220000) 37 # include <sys/filio.h> 38 # include <sys/fcntl.h> 39 #else 40 # include <sys/ioctl.h> 41 #endif 42 #if !defined(linux) 43 # include <sys/protosw.h> 44 #endif 45 #include <sys/socket.h> 46 #if defined(_KERNEL) 47 # include <sys/systm.h> 48 # if !defined(__SVR4) && !defined(__svr4__) && !defined(linux) 49 # include <sys/mbuf.h> 50 # endif 51 #endif 52 #if defined(__SVR4) || defined(__svr4__) 53 # include <sys/filio.h> 54 # include <sys/byteorder.h> 55 # ifdef _KERNEL 56 # include <sys/dditypes.h> 57 # endif 58 # include <sys/stream.h> 59 # include <sys/kmem.h> 60 #endif 61 #if (defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199802)) || \ 62 (defined(__FreeBSD_version) &&(__FreeBSD_version >= 400000)) 63 # include <sys/queue.h> 64 #endif 65 #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi) 66 # include <machine/cpu.h> 67 #endif 68 #if defined(_KERNEL) && defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000) 69 # include <sys/proc.h> 70 #endif 71 #if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 400000) && \ 72 !defined(_KERNEL) 73 # include <stdbool.h> 74 #endif 75 #include <net/if.h> 76 #include <net/route.h> 77 #ifdef sun 78 # include <net/af.h> 79 #endif 80 #include <netinet/in.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/ip.h> 83 #if !defined(_KERNEL) && !defined(__osf__) && !defined(__sgi) 84 # define KERNEL 85 # define _KERNEL 86 # define NOT_KERNEL 87 #endif 88 #if !defined(linux) 89 # include <netinet/ip_var.h> 90 #endif 91 #ifdef NOT_KERNEL 92 # undef _KERNEL 93 # undef KERNEL 94 #endif 95 #include <netinet/tcp.h> 96 #if defined(IRIX) && (IRIX < 60516) /* IRIX < 6 */ 97 extern struct ifqueue ipintrq; /* ip packet input queue */ 98 #else 99 # if !defined(__hpux) && !defined(linux) 100 # if __FreeBSD_version >= 300000 101 # include <net/if_var.h> 102 # if __FreeBSD_version >= 500042 103 # define IF_QFULL _IF_QFULL 104 # define IF_DROP _IF_DROP 105 # endif /* __FreeBSD_version >= 500042 */ 106 # endif 107 # include <netinet/in_var.h> 108 # include <netinet/tcp_fsm.h> 109 # endif 110 #endif 111 #include <netinet/udp.h> 112 #include <netinet/ip_icmp.h> 113 #include "netinet/ip_compat.h" 114 #include "netinet/ip_fil.h" 115 #include "netinet/ip_auth.h" 116 #if !defined(MENTAT) && !defined(linux) 117 # include <net/netisr.h> 118 # ifdef __FreeBSD__ 119 # include <machine/cpufunc.h> 120 # endif 121 #endif 122 #if (__FreeBSD_version >= 300000) 123 # include <sys/malloc.h> 124 # if defined(_KERNEL) && !defined(IPFILTER_LKM) 125 # include <sys/libkern.h> 126 # include <sys/systm.h> 127 # endif 128 #endif 129 /* END OF INCLUDES */ 130 131 #if !defined(lint) 132 #if defined(__NetBSD__) 133 __KERNEL_RCSID(0, "$NetBSD: ip_auth.c,v 1.5.26.1 2018/05/21 04:36:14 pgoyette Exp $"); 134 #else 135 static const char rcsid[] = "@(#)Id: ip_auth.c,v 1.1.1.2 2012/07/22 13:45:08 darrenr Exp"; 136 #endif 137 #endif 138 139 140 typedef struct ipf_auth_softc_s { 141 #if SOLARIS && defined(_KERNEL) 142 kcondvar_t ipf_auth_wait; 143 #endif /* SOLARIS */ 144 #if defined(linux) && defined(_KERNEL) 145 wait_queue_head_t ipf_auth_next_linux; 146 #endif 147 ipfrwlock_t ipf_authlk; 148 ipfmutex_t ipf_auth_mx; 149 int ipf_auth_size; 150 int ipf_auth_used; 151 int ipf_auth_replies; 152 int ipf_auth_defaultage; 153 int ipf_auth_lock; 154 ipf_authstat_t ipf_auth_stats; 155 frauth_t *ipf_auth; 156 mb_t **ipf_auth_pkts; 157 int ipf_auth_start; 158 int ipf_auth_end; 159 int ipf_auth_next; 160 frauthent_t *ipf_auth_entries; 161 frentry_t *ipf_auth_ip; 162 frentry_t *ipf_auth_rules; 163 } ipf_auth_softc_t; 164 165 166 static void ipf_auth_deref(frauthent_t **); 167 static void ipf_auth_deref_unlocked(ipf_auth_softc_t *, frauthent_t **); 168 static int ipf_auth_geniter(ipf_main_softc_t *, ipftoken_t *, 169 ipfgeniter_t *, ipfobj_t *); 170 static int ipf_auth_reply(ipf_main_softc_t *, ipf_auth_softc_t *, char *); 171 static int ipf_auth_wait(ipf_main_softc_t *, ipf_auth_softc_t *, char *); 172 static int ipf_auth_flush(void *); 173 174 175 /* ------------------------------------------------------------------------ */ 176 /* Function: ipf_auth_main_load */ 177 /* Returns: int - 0 == success, else error */ 178 /* Parameters: None */ 179 /* */ 180 /* A null-op function that exists as a placeholder so that the flow in */ 181 /* other functions is obvious. */ 182 /* ------------------------------------------------------------------------ */ 183 int 184 ipf_auth_main_load(void) 185 { 186 return 0; 187 } 188 189 190 /* ------------------------------------------------------------------------ */ 191 /* Function: ipf_auth_main_unload */ 192 /* Returns: int - 0 == success, else error */ 193 /* Parameters: None */ 194 /* */ 195 /* A null-op function that exists as a placeholder so that the flow in */ 196 /* other functions is obvious. */ 197 /* ------------------------------------------------------------------------ */ 198 int 199 ipf_auth_main_unload(void) 200 { 201 return 0; 202 } 203 204 205 /* ------------------------------------------------------------------------ */ 206 /* Function: ipf_auth_soft_create */ 207 /* Returns: int - NULL = failure, else success */ 208 /* Parameters: softc(I) - pointer to soft context data */ 209 /* */ 210 /* Create a structre to store all of the run-time data for packet auth in */ 211 /* and initialise some fields to their defaults. */ 212 /* ------------------------------------------------------------------------ */ 213 void * 214 ipf_auth_soft_create(ipf_main_softc_t *softc) 215 { 216 ipf_auth_softc_t *softa; 217 218 KMALLOC(softa, ipf_auth_softc_t *); 219 if (softa == NULL) 220 return NULL; 221 222 bzero((char *)softa, sizeof(*softa)); 223 224 softa->ipf_auth_size = FR_NUMAUTH; 225 softa->ipf_auth_defaultage = 600; 226 227 RWLOCK_INIT(&softa->ipf_authlk, "ipf IP User-Auth rwlock"); 228 MUTEX_INIT(&softa->ipf_auth_mx, "ipf auth log mutex"); 229 #if SOLARIS && defined(_KERNEL) 230 cv_init(&softa->ipf_auth_wait, "ipf auth condvar", CV_DRIVER, NULL); 231 #endif 232 233 return softa; 234 } 235 236 /* ------------------------------------------------------------------------ */ 237 /* Function: ipf_auth_soft_init */ 238 /* Returns: int - 0 == success, else error */ 239 /* Parameters: softc(I) - pointer to soft context data */ 240 /* arg(I) - opaque pointer to auth context data */ 241 /* */ 242 /* Allocate memory and initialise data structures used in handling auth */ 243 /* rules. */ 244 /* ------------------------------------------------------------------------ */ 245 int 246 ipf_auth_soft_init(ipf_main_softc_t *softc, void *arg) 247 { 248 ipf_auth_softc_t *softa = arg; 249 250 KMALLOCS(softa->ipf_auth, frauth_t *, 251 softa->ipf_auth_size * sizeof(*softa->ipf_auth)); 252 if (softa->ipf_auth == NULL) 253 return -1; 254 bzero((char *)softa->ipf_auth, 255 softa->ipf_auth_size * sizeof(*softa->ipf_auth)); 256 257 KMALLOCS(softa->ipf_auth_pkts, mb_t **, 258 softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts)); 259 if (softa->ipf_auth_pkts == NULL) 260 return -2; 261 bzero((char *)softa->ipf_auth_pkts, 262 softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts)); 263 264 #if defined(linux) && defined(_KERNEL) 265 init_waitqueue_head(&softa->ipf_auth_next_linux); 266 #endif 267 268 return 0; 269 } 270 271 272 /* ------------------------------------------------------------------------ */ 273 /* Function: ipf_auth_soft_fini */ 274 /* Returns: int - 0 == success, else error */ 275 /* Parameters: softc(I) - pointer to soft context data */ 276 /* arg(I) - opaque pointer to auth context data */ 277 /* */ 278 /* Free all network buffer memory used to keep saved packets that have been */ 279 /* connectedd to the soft soft context structure *but* do not free that: it */ 280 /* is free'd by _destroy(). */ 281 /* ------------------------------------------------------------------------ */ 282 int 283 ipf_auth_soft_fini(ipf_main_softc_t *softc, void *arg) 284 { 285 ipf_auth_softc_t *softa = arg; 286 frauthent_t *fae, **faep; 287 frentry_t *fr, **frp; 288 mb_t *m; 289 int i; 290 291 if (softa->ipf_auth != NULL) { 292 KFREES(softa->ipf_auth, 293 softa->ipf_auth_size * sizeof(*softa->ipf_auth)); 294 softa->ipf_auth = NULL; 295 } 296 297 if (softa->ipf_auth_pkts != NULL) { 298 for (i = 0; i < softa->ipf_auth_size; i++) { 299 m = softa->ipf_auth_pkts[i]; 300 if (m != NULL) { 301 FREE_MB_T(m); 302 softa->ipf_auth_pkts[i] = NULL; 303 } 304 } 305 KFREES(softa->ipf_auth_pkts, 306 softa->ipf_auth_size * sizeof(*softa->ipf_auth_pkts)); 307 softa->ipf_auth_pkts = NULL; 308 } 309 310 faep = &softa->ipf_auth_entries; 311 while ((fae = *faep) != NULL) { 312 *faep = fae->fae_next; 313 KFREE(fae); 314 } 315 softa->ipf_auth_ip = NULL; 316 317 if (softa->ipf_auth_rules != NULL) { 318 for (frp = &softa->ipf_auth_rules; ((fr = *frp) != NULL); ) { 319 if (fr->fr_ref == 1) { 320 *frp = fr->fr_next; 321 MUTEX_DESTROY(&fr->fr_lock); 322 KFREE(fr); 323 } else 324 frp = &fr->fr_next; 325 } 326 } 327 328 return 0; 329 } 330 331 332 /* ------------------------------------------------------------------------ */ 333 /* Function: ipf_auth_soft_destroy */ 334 /* Returns: void */ 335 /* Parameters: softc(I) - pointer to soft context data */ 336 /* arg(I) - opaque pointer to auth context data */ 337 /* */ 338 /* Undo what was done in _create() - i.e. free the soft context data. */ 339 /* ------------------------------------------------------------------------ */ 340 void 341 ipf_auth_soft_destroy(ipf_main_softc_t *softc, void *arg) 342 { 343 ipf_auth_softc_t *softa = arg; 344 345 # if SOLARIS && defined(_KERNEL) 346 cv_destroy(&softa->ipf_auth_wait); 347 # endif 348 MUTEX_DESTROY(&softa->ipf_auth_mx); 349 RW_DESTROY(&softa->ipf_authlk); 350 351 KFREE(softa); 352 } 353 354 355 /* ------------------------------------------------------------------------ */ 356 /* Function: ipf_auth_setlock */ 357 /* Returns: void */ 358 /* Paramters: arg(I) - pointer to soft context data */ 359 /* tmp(I) - value to assign to auth lock */ 360 /* */ 361 /* ------------------------------------------------------------------------ */ 362 void 363 ipf_auth_setlock(void *arg, int tmp) 364 { 365 ipf_auth_softc_t *softa = arg; 366 367 softa->ipf_auth_lock = tmp; 368 } 369 370 371 /* ------------------------------------------------------------------------ */ 372 /* Function: ipf_auth_check */ 373 /* Returns: frentry_t* - pointer to ipf rule if match found, else NULL */ 374 /* Parameters: fin(I) - pointer to ipftoken structure */ 375 /* passp(I) - pointer to ipfgeniter structure */ 376 /* */ 377 /* Check if a packet has authorization. If the packet is found to match an */ 378 /* authorization result and that would result in a feedback loop (i.e. it */ 379 /* will end up returning FR_AUTH) then return FR_BLOCK instead. */ 380 /* ------------------------------------------------------------------------ */ 381 frentry_t * 382 ipf_auth_check(fr_info_t *fin, u_32_t *passp) 383 { 384 ipf_main_softc_t *softc = fin->fin_main_soft; 385 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 386 frentry_t *fr; 387 frauth_t *fra; 388 u_32_t pass; 389 u_short id; 390 ip_t *ip; 391 int i; 392 393 if (softa->ipf_auth_lock || !softa->ipf_auth_used) 394 return NULL; 395 396 ip = fin->fin_ip; 397 id = ip->ip_id; 398 399 READ_ENTER(&softa->ipf_authlk); 400 for (i = softa->ipf_auth_start; i != softa->ipf_auth_end; ) { 401 /* 402 * index becomes -2 only after an SIOCAUTHW. Check this in 403 * case the same packet gets sent again and it hasn't yet been 404 * auth'd. 405 */ 406 fra = softa->ipf_auth + i; 407 if ((fra->fra_index == -2) && (id == fra->fra_info.fin_id) && 408 !bcmp((char *)fin, (char *)&fra->fra_info, FI_CSIZE)) { 409 /* 410 * Avoid feedback loop. 411 */ 412 if (!(pass = fra->fra_pass) || (FR_ISAUTH(pass))) { 413 pass = FR_BLOCK; 414 fin->fin_reason = FRB_AUTHFEEDBACK; 415 } 416 /* 417 * Create a dummy rule for the stateful checking to 418 * use and return. Zero out any values we don't 419 * trust from userland! 420 */ 421 if ((pass & FR_KEEPSTATE) || ((pass & FR_KEEPFRAG) && 422 (fin->fin_flx & FI_FRAG))) { 423 KMALLOC(fr, frentry_t *); 424 if (fr) { 425 bcopy((char *)fra->fra_info.fin_fr, 426 (char *)fr, sizeof(*fr)); 427 fr->fr_grp = NULL; 428 fr->fr_ifa = fin->fin_ifp; 429 fr->fr_func = NULL; 430 fr->fr_ref = 1; 431 fr->fr_flags = pass; 432 fr->fr_ifas[1] = NULL; 433 fr->fr_ifas[2] = NULL; 434 fr->fr_ifas[3] = NULL; 435 MUTEX_INIT(&fr->fr_lock, 436 "ipf auth rule"); 437 } 438 } else 439 fr = fra->fra_info.fin_fr; 440 fin->fin_fr = fr; 441 fin->fin_flx |= fra->fra_flx; 442 RWLOCK_EXIT(&softa->ipf_authlk); 443 444 WRITE_ENTER(&softa->ipf_authlk); 445 /* 446 * ipf_auth_rules is populated with the rules malloc'd 447 * above and only those. 448 */ 449 if ((fr != NULL) && (fr != fra->fra_info.fin_fr)) { 450 fr->fr_next = softa->ipf_auth_rules; 451 softa->ipf_auth_rules = fr; 452 } 453 softa->ipf_auth_stats.fas_hits++; 454 fra->fra_index = -1; 455 softa->ipf_auth_used--; 456 softa->ipf_auth_replies--; 457 if (i == softa->ipf_auth_start) { 458 while (fra->fra_index == -1) { 459 i++; 460 fra++; 461 if (i == softa->ipf_auth_size) { 462 i = 0; 463 fra = softa->ipf_auth; 464 } 465 softa->ipf_auth_start = i; 466 if (i == softa->ipf_auth_end) 467 break; 468 } 469 if (softa->ipf_auth_start == 470 softa->ipf_auth_end) { 471 softa->ipf_auth_next = 0; 472 softa->ipf_auth_start = 0; 473 softa->ipf_auth_end = 0; 474 } 475 } 476 RWLOCK_EXIT(&softa->ipf_authlk); 477 if (passp != NULL) 478 *passp = pass; 479 softa->ipf_auth_stats.fas_hits++; 480 return fr; 481 } 482 i++; 483 if (i == softa->ipf_auth_size) 484 i = 0; 485 } 486 RWLOCK_EXIT(&softa->ipf_authlk); 487 softa->ipf_auth_stats.fas_miss++; 488 return NULL; 489 } 490 491 492 /* ------------------------------------------------------------------------ */ 493 /* Function: ipf_auth_new */ 494 /* Returns: int - 1 == success, 0 = did not put packet on auth queue */ 495 /* Parameters: m(I) - pointer to mb_t with packet in it */ 496 /* fin(I) - pointer to packet information */ 497 /* */ 498 /* Check if we have room in the auth array to hold details for another */ 499 /* packet. If we do, store it and wake up any user programs which are */ 500 /* waiting to hear about these events. */ 501 /* ------------------------------------------------------------------------ */ 502 int 503 ipf_auth_new(mb_t *m, fr_info_t *fin) 504 { 505 ipf_main_softc_t *softc = fin->fin_main_soft; 506 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 507 #if defined(_KERNEL) && defined(MENTAT) 508 qpktinfo_t *qpi = fin->fin_qpi; 509 #endif 510 frauth_t *fra; 511 #if !defined(sparc) && !defined(m68k) 512 ip_t *ip; 513 #endif 514 int i; 515 516 if (softa->ipf_auth_lock) 517 return 0; 518 519 WRITE_ENTER(&softa->ipf_authlk); 520 if (((softa->ipf_auth_end + 1) % softa->ipf_auth_size) == 521 softa->ipf_auth_start) { 522 softa->ipf_auth_stats.fas_nospace++; 523 RWLOCK_EXIT(&softa->ipf_authlk); 524 return 0; 525 } 526 527 softa->ipf_auth_stats.fas_added++; 528 softa->ipf_auth_used++; 529 i = softa->ipf_auth_end++; 530 if (softa->ipf_auth_end == softa->ipf_auth_size) 531 softa->ipf_auth_end = 0; 532 533 fra = softa->ipf_auth + i; 534 fra->fra_index = i; 535 if (fin->fin_fr != NULL) 536 fra->fra_pass = fin->fin_fr->fr_flags; 537 else 538 fra->fra_pass = 0; 539 fra->fra_age = softa->ipf_auth_defaultage; 540 bcopy((char *)fin, (char *)&fra->fra_info, sizeof(*fin)); 541 fra->fra_flx = fra->fra_info.fin_flx & (FI_STATE|FI_NATED); 542 fra->fra_info.fin_flx &= ~(FI_STATE|FI_NATED); 543 #if !defined(sparc) && !defined(m68k) 544 /* 545 * No need to copyback here as we want to undo the changes, not keep 546 * them. 547 */ 548 ip = fin->fin_ip; 549 # if defined(MENTAT) && defined(_KERNEL) 550 if ((ip == (ip_t *)m->b_rptr) && (fin->fin_v == 4)) 551 # endif 552 { 553 register u_short bo; 554 555 bo = ip->ip_len; 556 ip->ip_len = htons(bo); 557 bo = ip->ip_off; 558 ip->ip_off = htons(bo); 559 } 560 #endif 561 #if SOLARIS && defined(_KERNEL) 562 COPYIFNAME(fin->fin_v, fin->fin_ifp, fra->fra_info.fin_ifname); 563 m->b_rptr -= qpi->qpi_off; 564 fra->fra_q = qpi->qpi_q; /* The queue can disappear! */ 565 fra->fra_m = *fin->fin_mp; 566 fra->fra_info.fin_mp = &fra->fra_m; 567 softa->ipf_auth_pkts[i] = *(mblk_t **)fin->fin_mp; 568 RWLOCK_EXIT(&softa->ipf_authlk); 569 cv_signal(&softa->ipf_auth_wait); 570 pollwakeup(&softc->ipf_poll_head[IPL_LOGAUTH], POLLIN|POLLRDNORM); 571 #else 572 softa->ipf_auth_pkts[i] = m; 573 RWLOCK_EXIT(&softa->ipf_authlk); 574 WAKEUP(&softa->ipf_auth_next, 0); 575 #endif 576 return 1; 577 } 578 579 580 /* ------------------------------------------------------------------------ */ 581 /* Function: ipf_auth_ioctl */ 582 /* Returns: int - 0 == success, else error */ 583 /* Parameters: data(IO) - pointer to ioctl data */ 584 /* cmd(I) - ioctl command */ 585 /* mode(I) - mode flags associated with open descriptor */ 586 /* uid(I) - uid associatd with application making the call */ 587 /* ctx(I) - pointer for context */ 588 /* */ 589 /* This function handles all of the ioctls recognised by the auth component */ 590 /* in IPFilter - ie ioctls called on an open fd for /dev/ipf_auth */ 591 /* ------------------------------------------------------------------------ */ 592 int 593 ipf_auth_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode, 594 int uid, void *ctx) 595 { 596 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 597 int error = 0, i; 598 SPL_INT(s); 599 600 switch (cmd) 601 { 602 case SIOCGENITER : 603 { 604 ipftoken_t *token; 605 ipfgeniter_t iter; 606 ipfobj_t obj; 607 608 error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER); 609 if (error != 0) 610 break; 611 612 SPL_SCHED(s); 613 token = ipf_token_find(softc, IPFGENITER_AUTH, uid, ctx); 614 if (token != NULL) 615 error = ipf_auth_geniter(softc, token, &iter, &obj); 616 else { 617 WRITE_ENTER(&softc->ipf_tokens); 618 ipf_token_deref(softc, token); 619 RWLOCK_EXIT(&softc->ipf_tokens); 620 IPFERROR(10001); 621 error = ESRCH; 622 } 623 SPL_X(s); 624 625 break; 626 } 627 628 case SIOCADAFR : 629 case SIOCRMAFR : 630 if (!(mode & FWRITE)) { 631 IPFERROR(10002); 632 error = EPERM; 633 } else 634 error = frrequest(softc, IPL_LOGAUTH, cmd, data, 635 softc->ipf_active, 1); 636 break; 637 638 case SIOCSTLCK : 639 if (!(mode & FWRITE)) { 640 IPFERROR(10003); 641 error = EPERM; 642 } else { 643 error = ipf_lock(data, &softa->ipf_auth_lock); 644 } 645 break; 646 647 case SIOCATHST: 648 softa->ipf_auth_stats.fas_faelist = softa->ipf_auth_entries; 649 error = ipf_outobj(softc, data, &softa->ipf_auth_stats, 650 IPFOBJ_AUTHSTAT); 651 break; 652 653 case SIOCIPFFL: 654 SPL_NET(s); 655 WRITE_ENTER(&softa->ipf_authlk); 656 i = ipf_auth_flush(softa); 657 RWLOCK_EXIT(&softa->ipf_authlk); 658 SPL_X(s); 659 error = BCOPYOUT(&i, data, sizeof(i)); 660 if (error != 0) { 661 IPFERROR(10004); 662 error = EFAULT; 663 } 664 break; 665 666 case SIOCAUTHW: 667 error = ipf_auth_wait(softc, softa, data); 668 break; 669 670 case SIOCAUTHR: 671 error = ipf_auth_reply(softc, softa, data); 672 break; 673 674 default : 675 IPFERROR(10005); 676 error = EINVAL; 677 break; 678 } 679 return error; 680 } 681 682 683 /* ------------------------------------------------------------------------ */ 684 /* Function: ipf_auth_expire */ 685 /* Returns: None */ 686 /* Parameters: None */ 687 /* */ 688 /* Slowly expire held auth records. Timeouts are set in expectation of */ 689 /* this being called twice per second. */ 690 /* ------------------------------------------------------------------------ */ 691 void 692 ipf_auth_expire(ipf_main_softc_t *softc) 693 { 694 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 695 frauthent_t *fae, **faep; 696 frentry_t *fr, **frp; 697 frauth_t *fra; 698 mb_t *m; 699 int i; 700 SPL_INT(s); 701 702 if (softa->ipf_auth_lock) 703 return; 704 SPL_NET(s); 705 WRITE_ENTER(&softa->ipf_authlk); 706 for (i = 0, fra = softa->ipf_auth; i < softa->ipf_auth_size; 707 i++, fra++) { 708 fra->fra_age--; 709 if ((fra->fra_age == 0) && 710 (softa->ipf_auth[i].fra_index != -1)) { 711 if ((m = softa->ipf_auth_pkts[i]) != NULL) { 712 FREE_MB_T(m); 713 softa->ipf_auth_pkts[i] = NULL; 714 } else if (softa->ipf_auth[i].fra_index == -2) { 715 softa->ipf_auth_replies--; 716 } 717 softa->ipf_auth[i].fra_index = -1; 718 softa->ipf_auth_stats.fas_expire++; 719 softa->ipf_auth_used--; 720 } 721 } 722 723 /* 724 * Expire pre-auth rules 725 */ 726 for (faep = &softa->ipf_auth_entries; ((fae = *faep) != NULL); ) { 727 fae->fae_age--; 728 if (fae->fae_age == 0) { 729 ipf_auth_deref(&fae); 730 softa->ipf_auth_stats.fas_expire++; 731 } else 732 faep = &fae->fae_next; 733 } 734 if (softa->ipf_auth_entries != NULL) 735 softa->ipf_auth_ip = &softa->ipf_auth_entries->fae_fr; 736 else 737 softa->ipf_auth_ip = NULL; 738 739 for (frp = &softa->ipf_auth_rules; ((fr = *frp) != NULL); ) { 740 if (fr->fr_ref == 1) { 741 *frp = fr->fr_next; 742 MUTEX_DESTROY(&fr->fr_lock); 743 KFREE(fr); 744 } else 745 frp = &fr->fr_next; 746 } 747 RWLOCK_EXIT(&softa->ipf_authlk); 748 SPL_X(s); 749 } 750 751 752 /* ------------------------------------------------------------------------ */ 753 /* Function: ipf_auth_precmd */ 754 /* Returns: int - 0 == success, else error */ 755 /* Parameters: cmd(I) - ioctl command for rule */ 756 /* fr(I) - pointer to ipf rule */ 757 /* fptr(I) - pointer to caller's 'fr' */ 758 /* */ 759 /* ------------------------------------------------------------------------ */ 760 int 761 ipf_auth_precmd(ipf_main_softc_t *softc, ioctlcmd_t cmd, frentry_t *fr, 762 frentry_t **frptr) 763 { 764 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 765 frauthent_t *fae, **faep; 766 int error = 0; 767 SPL_INT(s); 768 769 if ((cmd != SIOCADAFR) && (cmd != SIOCRMAFR)) { 770 IPFERROR(10006); 771 return EIO; 772 } 773 774 for (faep = &softa->ipf_auth_entries; ((fae = *faep) != NULL); ) { 775 if (&fae->fae_fr == fr) 776 break; 777 else 778 faep = &fae->fae_next; 779 } 780 781 if (cmd == (ioctlcmd_t)SIOCRMAFR) { 782 if (fr == NULL || frptr == NULL) { 783 IPFERROR(10007); 784 error = EINVAL; 785 786 } else if (fae == NULL) { 787 IPFERROR(10008); 788 error = ESRCH; 789 790 } else { 791 SPL_NET(s); 792 WRITE_ENTER(&softa->ipf_authlk); 793 *faep = fae->fae_next; 794 if (softa->ipf_auth_ip == &fae->fae_fr) 795 softa->ipf_auth_ip = softa->ipf_auth_entries ? 796 &softa->ipf_auth_entries->fae_fr : NULL; 797 RWLOCK_EXIT(&softa->ipf_authlk); 798 SPL_X(s); 799 800 KFREE(fae); 801 } 802 } else if (fr != NULL && frptr != NULL) { 803 KMALLOC(fae, frauthent_t *); 804 if (fae != NULL) { 805 bcopy((char *)fr, (char *)&fae->fae_fr, 806 sizeof(*fr)); 807 SPL_NET(s); 808 WRITE_ENTER(&softa->ipf_authlk); 809 fae->fae_age = softa->ipf_auth_defaultage; 810 fae->fae_fr.fr_hits = 0; 811 fae->fae_fr.fr_next = *frptr; 812 fae->fae_ref = 1; 813 *frptr = &fae->fae_fr; 814 fae->fae_next = *faep; 815 *faep = fae; 816 softa->ipf_auth_ip = &softa->ipf_auth_entries->fae_fr; 817 RWLOCK_EXIT(&softa->ipf_authlk); 818 SPL_X(s); 819 } else { 820 IPFERROR(10009); 821 error = ENOMEM; 822 } 823 } else { 824 IPFERROR(10010); 825 error = EINVAL; 826 } 827 return error; 828 } 829 830 831 /* ------------------------------------------------------------------------ */ 832 /* Function: ipf_auth_flush */ 833 /* Returns: int - number of auth entries flushed */ 834 /* Parameters: None */ 835 /* Locks: WRITE(ipf_authlk) */ 836 /* */ 837 /* This function flushs the ipf_auth_pkts array of any packet data with */ 838 /* references still there. */ 839 /* It is expected that the caller has already acquired the correct locks or */ 840 /* set the priority level correctly for this to block out other code paths */ 841 /* into these data structures. */ 842 /* ------------------------------------------------------------------------ */ 843 static int 844 ipf_auth_flush(void *arg) 845 { 846 ipf_auth_softc_t *softa = arg; 847 int i, num_flushed; 848 mb_t *m; 849 850 if (softa->ipf_auth_lock) 851 return -1; 852 853 num_flushed = 0; 854 855 for (i = 0 ; i < softa->ipf_auth_size; i++) { 856 if (softa->ipf_auth[i].fra_index != -1) { 857 m = softa->ipf_auth_pkts[i]; 858 if (m != NULL) { 859 FREE_MB_T(m); 860 softa->ipf_auth_pkts[i] = NULL; 861 } 862 863 softa->ipf_auth[i].fra_index = -1; 864 /* perhaps add & use a flush counter inst.*/ 865 softa->ipf_auth_stats.fas_expire++; 866 num_flushed++; 867 } 868 } 869 870 softa->ipf_auth_start = 0; 871 softa->ipf_auth_end = 0; 872 softa->ipf_auth_next = 0; 873 softa->ipf_auth_used = 0; 874 softa->ipf_auth_replies = 0; 875 876 return num_flushed; 877 } 878 879 880 /* ------------------------------------------------------------------------ */ 881 /* Function: ipf_auth_waiting */ 882 /* Returns: int - number of packets in the auth queue */ 883 /* Parameters: None */ 884 /* */ 885 /* Simple truth check to see if there are any packets waiting in the auth */ 886 /* queue. */ 887 /* ------------------------------------------------------------------------ */ 888 int 889 ipf_auth_waiting(ipf_main_softc_t *softc) 890 { 891 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 892 893 return (softa->ipf_auth_used != 0); 894 } 895 896 897 /* ------------------------------------------------------------------------ */ 898 /* Function: ipf_auth_geniter */ 899 /* Returns: int - 0 == success, else error */ 900 /* Parameters: token(I) - pointer to ipftoken structure */ 901 /* itp(I) - pointer to ipfgeniter structure */ 902 /* objp(I) - pointer to ipf object destription */ 903 /* */ 904 /* Iterate through the list of entries in the auth queue list. */ 905 /* objp is used here to get the location of where to do the copy out to. */ 906 /* Stomping over various fields with new information will not harm anything */ 907 /* ------------------------------------------------------------------------ */ 908 static int 909 ipf_auth_geniter(ipf_main_softc_t *softc, ipftoken_t *token, ipfgeniter_t *itp, 910 ipfobj_t *objp) 911 { 912 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 913 frauthent_t *fae, *next, zero; 914 int error; 915 916 if (itp->igi_data == NULL) { 917 IPFERROR(10011); 918 return EFAULT; 919 } 920 921 if (itp->igi_type != IPFGENITER_AUTH) { 922 IPFERROR(10012); 923 return EINVAL; 924 } 925 926 objp->ipfo_type = IPFOBJ_FRAUTH; 927 objp->ipfo_ptr = itp->igi_data; 928 objp->ipfo_size = sizeof(frauth_t); 929 930 READ_ENTER(&softa->ipf_authlk); 931 932 fae = token->ipt_data; 933 if (fae == NULL) { 934 next = softa->ipf_auth_entries; 935 } else { 936 next = fae->fae_next; 937 } 938 939 /* 940 * If we found an auth entry to use, bump its reference count 941 * so that it can be used for is_next when we come back. 942 */ 943 if (next != NULL) { 944 ATOMIC_INC(next->fae_ref); 945 token->ipt_data = next; 946 } else { 947 bzero(&zero, sizeof(zero)); 948 next = &zero; 949 token->ipt_data = NULL; 950 } 951 952 RWLOCK_EXIT(&softa->ipf_authlk); 953 954 error = ipf_outobjk(softc, objp, next); 955 if (fae != NULL) 956 ipf_auth_deref_unlocked(softa, &fae); 957 958 if (next->fae_next == NULL) 959 ipf_token_mark_complete(token); 960 return error; 961 } 962 963 964 /* ------------------------------------------------------------------------ */ 965 /* Function: ipf_auth_deref_unlocked */ 966 /* Returns: None */ 967 /* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */ 968 /* */ 969 /* Wrapper for ipf_auth_deref for when a write lock on ipf_authlk is not */ 970 /* held. */ 971 /* ------------------------------------------------------------------------ */ 972 static void 973 ipf_auth_deref_unlocked(ipf_auth_softc_t *softa, frauthent_t **faep) 974 { 975 WRITE_ENTER(&softa->ipf_authlk); 976 ipf_auth_deref(faep); 977 RWLOCK_EXIT(&softa->ipf_authlk); 978 } 979 980 981 /* ------------------------------------------------------------------------ */ 982 /* Function: ipf_auth_deref */ 983 /* Returns: None */ 984 /* Parameters: faep(IO) - pointer to caller's frauthent_t pointer */ 985 /* Locks: WRITE(ipf_authlk) */ 986 /* */ 987 /* This function unconditionally sets the pointer in the caller to NULL, */ 988 /* to make it clear that it should no longer use that pointer, and drops */ 989 /* the reference count on the structure by 1. If it reaches 0, free it up. */ 990 /* ------------------------------------------------------------------------ */ 991 static void 992 ipf_auth_deref(frauthent_t **faep) 993 { 994 frauthent_t *fae; 995 996 fae = *faep; 997 *faep = NULL; 998 999 fae->fae_ref--; 1000 if (fae->fae_ref == 0) { 1001 KFREE(fae); 1002 } 1003 } 1004 1005 1006 /* ------------------------------------------------------------------------ */ 1007 /* Function: ipf_auth_wait_pkt */ 1008 /* Returns: int - 0 == success, else error */ 1009 /* Parameters: data(I) - pointer to data from ioctl call */ 1010 /* */ 1011 /* This function is called when an application is waiting for a packet to */ 1012 /* match an "auth" rule by issuing an SIOCAUTHW ioctl. If there is already */ 1013 /* a packet waiting on the queue then we will return that _one_ immediately.*/ 1014 /* If there are no packets present in the queue (ipf_auth_pkts) then we go */ 1015 /* to sleep. */ 1016 /* ------------------------------------------------------------------------ */ 1017 static int 1018 ipf_auth_wait(ipf_main_softc_t *softc, ipf_auth_softc_t *softa, char *data) 1019 { 1020 frauth_t auth, *au = &auth; 1021 int error, len, i; 1022 mb_t *m; 1023 char *t; 1024 SPL_INT(s); 1025 1026 ipf_auth_ioctlloop: 1027 error = ipf_inobj(softc, data, NULL, au, IPFOBJ_FRAUTH); 1028 if (error != 0) 1029 return error; 1030 1031 /* 1032 * XXX Locks are held below over calls to copyout...a better 1033 * solution needs to be found so this isn't necessary. The situation 1034 * we are trying to guard against here is an error in the copyout 1035 * steps should not cause the packet to "disappear" from the queue. 1036 */ 1037 SPL_NET(s); 1038 READ_ENTER(&softa->ipf_authlk); 1039 1040 /* 1041 * If ipf_auth_next is not equal to ipf_auth_end it will be because 1042 * there is a packet waiting to be delt with in the ipf_auth_pkts 1043 * array. We copy as much of that out to user space as requested. 1044 */ 1045 if (softa->ipf_auth_used > 0) { 1046 while (softa->ipf_auth_pkts[softa->ipf_auth_next] == NULL) { 1047 softa->ipf_auth_next++; 1048 if (softa->ipf_auth_next == softa->ipf_auth_size) 1049 softa->ipf_auth_next = 0; 1050 } 1051 1052 error = ipf_outobj(softc, data, 1053 &softa->ipf_auth[softa->ipf_auth_next], 1054 IPFOBJ_FRAUTH); 1055 if (error != 0) { 1056 RWLOCK_EXIT(&softa->ipf_authlk); 1057 SPL_X(s); 1058 return error; 1059 } 1060 1061 if (auth.fra_len != 0 && auth.fra_buf != NULL) { 1062 /* 1063 * Copy packet contents out to user space if 1064 * requested. Bail on an error. 1065 */ 1066 m = softa->ipf_auth_pkts[softa->ipf_auth_next]; 1067 len = MSGDSIZE(m); 1068 if (len > auth.fra_len) 1069 len = auth.fra_len; 1070 auth.fra_len = len; 1071 1072 for (t = auth.fra_buf; m && (len > 0); ) { 1073 i = MIN(M_LEN(m), len); 1074 error = copyoutptr(softc, MTOD(m, char *), 1075 &t, i); 1076 len -= i; 1077 t += i; 1078 if (error != 0) { 1079 RWLOCK_EXIT(&softa->ipf_authlk); 1080 SPL_X(s); 1081 return error; 1082 } 1083 m = m->m_next; 1084 } 1085 } 1086 RWLOCK_EXIT(&softa->ipf_authlk); 1087 1088 SPL_NET(s); 1089 WRITE_ENTER(&softa->ipf_authlk); 1090 softa->ipf_auth_next++; 1091 if (softa->ipf_auth_next == softa->ipf_auth_size) 1092 softa->ipf_auth_next = 0; 1093 RWLOCK_EXIT(&softa->ipf_authlk); 1094 SPL_X(s); 1095 1096 return 0; 1097 } 1098 RWLOCK_EXIT(&softa->ipf_authlk); 1099 SPL_X(s); 1100 1101 MUTEX_ENTER(&softa->ipf_auth_mx); 1102 #ifdef _KERNEL 1103 # if SOLARIS 1104 error = 0; 1105 if (!cv_wait_sig(&softa->ipf_auth_wait, &softa->ipf_auth_mx.ipf_lk)) { 1106 IPFERROR(10014); 1107 error = EINTR; 1108 } 1109 # else /* SOLARIS */ 1110 # ifdef __hpux 1111 { 1112 lock_t *l; 1113 1114 l = get_sleep_lock(&softa->ipf_auth_next); 1115 error = sleep(&softa->ipf_auth_next, PZERO+1); 1116 spinunlock(l); 1117 } 1118 # else 1119 # ifdef __osf__ 1120 error = mpsleep(&softa->ipf_auth_next, PSUSP|PCATCH, "ipf_auth_next", 1121 0, &softa->ipf_auth_mx, MS_LOCK_SIMPLE); 1122 # else 1123 error = SLEEP(&softa->ipf_auth_next, "ipf_auth_next"); 1124 # endif /* __osf__ */ 1125 # endif /* __hpux */ 1126 # endif /* SOLARIS */ 1127 #endif 1128 MUTEX_EXIT(&softa->ipf_auth_mx); 1129 if (error == 0) 1130 goto ipf_auth_ioctlloop; 1131 return error; 1132 } 1133 1134 1135 /* ------------------------------------------------------------------------ */ 1136 /* Function: ipf_auth_reply */ 1137 /* Returns: int - 0 == success, else error */ 1138 /* Parameters: data(I) - pointer to data from ioctl call */ 1139 /* */ 1140 /* This function is called by an application when it wants to return a */ 1141 /* decision on a packet using the SIOCAUTHR ioctl. This is after it has */ 1142 /* received information using an SIOCAUTHW. The decision returned in the */ 1143 /* form of flags, the same as those used in each rule. */ 1144 /* ------------------------------------------------------------------------ */ 1145 static int 1146 ipf_auth_reply(ipf_main_softc_t *softc, ipf_auth_softc_t *softa, char *data) 1147 { 1148 frauth_t auth, *au = &auth, *fra; 1149 fr_info_t fin; 1150 int error, i; 1151 #ifdef _KERNEL 1152 mb_t *m; 1153 #endif 1154 SPL_INT(s); 1155 1156 error = ipf_inobj(softc, data, NULL, &auth, IPFOBJ_FRAUTH); 1157 if (error != 0) 1158 return error; 1159 1160 SPL_NET(s); 1161 WRITE_ENTER(&softa->ipf_authlk); 1162 1163 i = au->fra_index; 1164 fra = softa->ipf_auth + i; 1165 error = 0; 1166 1167 /* 1168 * Check the validity of the information being returned with two simple 1169 * checks. First, the auth index value should be within the size of 1170 * the array and second the packet id being returned should also match. 1171 */ 1172 if ((i < 0) || (i >= softa->ipf_auth_size)) { 1173 RWLOCK_EXIT(&softa->ipf_authlk); 1174 SPL_X(s); 1175 IPFERROR(10015); 1176 return ESRCH; 1177 } 1178 if (fra->fra_info.fin_id != au->fra_info.fin_id) { 1179 RWLOCK_EXIT(&softa->ipf_authlk); 1180 SPL_X(s); 1181 IPFERROR(10019); 1182 return ESRCH; 1183 } 1184 1185 fra->fra_index = -2; 1186 fra->fra_pass = au->fra_pass; 1187 #ifdef _KERNEL 1188 m = softa->ipf_auth_pkts[i]; 1189 #endif 1190 softa->ipf_auth_pkts[i] = NULL; 1191 softa->ipf_auth_replies++; 1192 bcopy(&fra->fra_info, &fin, sizeof(fin)); 1193 1194 RWLOCK_EXIT(&softa->ipf_authlk); 1195 1196 /* 1197 * Re-insert the packet back into the packet stream flowing through 1198 * the kernel in a manner that will mean IPFilter sees the packet 1199 * again. This is not the same as is done with fastroute, 1200 * deliberately, as we want to resume the normal packet processing 1201 * path for it. 1202 */ 1203 #ifdef _KERNEL 1204 if ((m != NULL) && (au->fra_info.fin_out != 0)) { 1205 error = ipf_inject(&fin, m); 1206 if (error != 0) { 1207 IPFERROR(10016); 1208 error = ENOBUFS; 1209 softa->ipf_auth_stats.fas_sendfail++; 1210 } else { 1211 softa->ipf_auth_stats.fas_sendok++; 1212 } 1213 } else if (m) { 1214 error = ipf_inject(&fin, m); 1215 if (error != 0) { 1216 IPFERROR(10017); 1217 error = ENOBUFS; 1218 softa->ipf_auth_stats.fas_quefail++; 1219 } else { 1220 softa->ipf_auth_stats.fas_queok++; 1221 } 1222 } else { 1223 IPFERROR(10018); 1224 error = EINVAL; 1225 } 1226 1227 /* 1228 * If we experience an error which will result in the packet 1229 * not being processed, make sure we advance to the next one. 1230 */ 1231 if (error == ENOBUFS) { 1232 WRITE_ENTER(&softa->ipf_authlk); 1233 softa->ipf_auth_used--; 1234 fra->fra_index = -1; 1235 fra->fra_pass = 0; 1236 if (i == softa->ipf_auth_start) { 1237 while (fra->fra_index == -1) { 1238 i++; 1239 if (i == softa->ipf_auth_size) 1240 i = 0; 1241 softa->ipf_auth_start = i; 1242 if (i == softa->ipf_auth_end) 1243 break; 1244 } 1245 if (softa->ipf_auth_start == softa->ipf_auth_end) { 1246 softa->ipf_auth_next = 0; 1247 softa->ipf_auth_start = 0; 1248 softa->ipf_auth_end = 0; 1249 } 1250 } 1251 RWLOCK_EXIT(&softa->ipf_authlk); 1252 } 1253 #endif /* _KERNEL */ 1254 SPL_X(s); 1255 1256 return 0; 1257 } 1258 1259 1260 u_32_t 1261 ipf_auth_pre_scanlist(ipf_main_softc_t *softc, fr_info_t *fin, u_32_t pass) 1262 { 1263 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 1264 1265 if (softa->ipf_auth_ip != NULL) 1266 return ipf_scanlist(fin, softc->ipf_pass); 1267 1268 return pass; 1269 } 1270 1271 1272 frentry_t ** 1273 ipf_auth_rulehead(ipf_main_softc_t *softc) 1274 { 1275 ipf_auth_softc_t *softa = softc->ipf_auth_soft; 1276 1277 return &softa->ipf_auth_ip; 1278 } 1279
Indexes created Thu Oct 02 14:10:14 GMT 2025