cryptodev.c revision 241370
1/* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */ 2 3/*- 4 * Copyright (c) 2001 Theo de Raadt 5 * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 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. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * Effort sponsored in part by the Defense Advanced Research Projects 31 * Agency (DARPA) and Air Force Research Laboratory, Air Force 32 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 33 */ 34 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: head/sys/opencrypto/cryptodev.c 241370 2012-10-09 08:27:40Z kevlo $"); 37 38#include "opt_compat.h" 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/malloc.h> 43#include <sys/mbuf.h> 44#include <sys/lock.h> 45#include <sys/mutex.h> 46#include <sys/sysctl.h> 47#include <sys/file.h> 48#include <sys/filedesc.h> 49#include <sys/errno.h> 50#include <sys/uio.h> 51#include <sys/random.h> 52#include <sys/conf.h> 53#include <sys/kernel.h> 54#include <sys/module.h> 55#include <sys/fcntl.h> 56#include <sys/bus.h> 57 58#include <opencrypto/cryptodev.h> 59#include <opencrypto/xform.h> 60 61#ifdef COMPAT_FREEBSD32 62#include <sys/mount.h> 63#include <compat/freebsd32/freebsd32.h> 64 65struct session_op32 { 66 u_int32_t cipher; 67 u_int32_t mac; 68 u_int32_t keylen; 69 u_int32_t key; 70 int mackeylen; 71 u_int32_t mackey; 72 u_int32_t ses; 73}; 74 75struct session2_op32 { 76 u_int32_t cipher; 77 u_int32_t mac; 78 u_int32_t keylen; 79 u_int32_t key; 80 int mackeylen; 81 u_int32_t mackey; 82 u_int32_t ses; 83 int crid; 84 int pad[4]; 85}; 86 87struct crypt_op32 { 88 u_int32_t ses; 89 u_int16_t op; 90 u_int16_t flags; 91 u_int len; 92 u_int32_t src, dst; 93 u_int32_t mac; 94 u_int32_t iv; 95}; 96 97struct crparam32 { 98 u_int32_t crp_p; 99 u_int crp_nbits; 100}; 101 102struct crypt_kop32 { 103 u_int crk_op; 104 u_int crk_status; 105 u_short crk_iparams; 106 u_short crk_oparams; 107 u_int crk_crid; 108 struct crparam32 crk_param[CRK_MAXPARAM]; 109}; 110 111struct cryptotstat32 { 112 struct timespec32 acc; 113 struct timespec32 min; 114 struct timespec32 max; 115 u_int32_t count; 116}; 117 118struct cryptostats32 { 119 u_int32_t cs_ops; 120 u_int32_t cs_errs; 121 u_int32_t cs_kops; 122 u_int32_t cs_kerrs; 123 u_int32_t cs_intrs; 124 u_int32_t cs_rets; 125 u_int32_t cs_blocks; 126 u_int32_t cs_kblocks; 127 struct cryptotstat32 cs_invoke; 128 struct cryptotstat32 cs_done; 129 struct cryptotstat32 cs_cb; 130 struct cryptotstat32 cs_finis; 131}; 132 133#define CIOCGSESSION32 _IOWR('c', 101, struct session_op32) 134#define CIOCCRYPT32 _IOWR('c', 103, struct crypt_op32) 135#define CIOCKEY32 _IOWR('c', 104, struct crypt_kop32) 136#define CIOCGSESSION232 _IOWR('c', 106, struct session2_op32) 137#define CIOCKEY232 _IOWR('c', 107, struct crypt_kop32) 138 139static void 140session_op_from_32(const struct session_op32 *from, struct session_op *to) 141{ 142 143 CP(*from, *to, cipher); 144 CP(*from, *to, mac); 145 CP(*from, *to, keylen); 146 PTRIN_CP(*from, *to, key); 147 CP(*from, *to, mackeylen); 148 PTRIN_CP(*from, *to, mackey); 149 CP(*from, *to, ses); 150} 151 152static void 153session2_op_from_32(const struct session2_op32 *from, struct session2_op *to) 154{ 155 156 session_op_from_32((const struct session_op32 *)from, 157 (struct session_op *)to); 158 CP(*from, *to, crid); 159} 160 161static void 162session_op_to_32(const struct session_op *from, struct session_op32 *to) 163{ 164 165 CP(*from, *to, cipher); 166 CP(*from, *to, mac); 167 CP(*from, *to, keylen); 168 PTROUT_CP(*from, *to, key); 169 CP(*from, *to, mackeylen); 170 PTROUT_CP(*from, *to, mackey); 171 CP(*from, *to, ses); 172} 173 174static void 175session2_op_to_32(const struct session2_op *from, struct session2_op32 *to) 176{ 177 178 session_op_to_32((const struct session_op *)from, 179 (struct session_op32 *)to); 180 CP(*from, *to, crid); 181} 182 183static void 184crypt_op_from_32(const struct crypt_op32 *from, struct crypt_op *to) 185{ 186 187 CP(*from, *to, ses); 188 CP(*from, *to, op); 189 CP(*from, *to, flags); 190 CP(*from, *to, len); 191 PTRIN_CP(*from, *to, src); 192 PTRIN_CP(*from, *to, dst); 193 PTRIN_CP(*from, *to, mac); 194 PTRIN_CP(*from, *to, iv); 195} 196 197static void 198crypt_op_to_32(const struct crypt_op *from, struct crypt_op32 *to) 199{ 200 201 CP(*from, *to, ses); 202 CP(*from, *to, op); 203 CP(*from, *to, flags); 204 CP(*from, *to, len); 205 PTROUT_CP(*from, *to, src); 206 PTROUT_CP(*from, *to, dst); 207 PTROUT_CP(*from, *to, mac); 208 PTROUT_CP(*from, *to, iv); 209} 210 211static void 212crparam_from_32(const struct crparam32 *from, struct crparam *to) 213{ 214 215 PTRIN_CP(*from, *to, crp_p); 216 CP(*from, *to, crp_nbits); 217} 218 219static void 220crparam_to_32(const struct crparam *from, struct crparam32 *to) 221{ 222 223 PTROUT_CP(*from, *to, crp_p); 224 CP(*from, *to, crp_nbits); 225} 226 227static void 228crypt_kop_from_32(const struct crypt_kop32 *from, struct crypt_kop *to) 229{ 230 int i; 231 232 CP(*from, *to, crk_op); 233 CP(*from, *to, crk_status); 234 CP(*from, *to, crk_iparams); 235 CP(*from, *to, crk_oparams); 236 CP(*from, *to, crk_crid); 237 for (i = 0; i < CRK_MAXPARAM; i++) 238 crparam_from_32(&from->crk_param[i], &to->crk_param[i]); 239} 240 241static void 242crypt_kop_to_32(const struct crypt_kop *from, struct crypt_kop32 *to) 243{ 244 int i; 245 246 CP(*from, *to, crk_op); 247 CP(*from, *to, crk_status); 248 CP(*from, *to, crk_iparams); 249 CP(*from, *to, crk_oparams); 250 CP(*from, *to, crk_crid); 251 for (i = 0; i < CRK_MAXPARAM; i++) 252 crparam_to_32(&from->crk_param[i], &to->crk_param[i]); 253} 254#endif 255 256struct csession { 257 TAILQ_ENTRY(csession) next; 258 u_int64_t sid; 259 u_int32_t ses; 260 struct mtx lock; /* for op submission */ 261 262 u_int32_t cipher; 263 struct enc_xform *txform; 264 u_int32_t mac; 265 struct auth_hash *thash; 266 267 caddr_t key; 268 int keylen; 269 u_char tmp_iv[EALG_MAX_BLOCK_LEN]; 270 271 caddr_t mackey; 272 int mackeylen; 273 274 struct iovec iovec; 275 struct uio uio; 276 int error; 277}; 278 279struct fcrypt { 280 TAILQ_HEAD(csessionlist, csession) csessions; 281 int sesn; 282}; 283 284static int cryptof_rw(struct file *fp, struct uio *uio, 285 struct ucred *cred, int flags, struct thread *); 286static int cryptof_truncate(struct file *, off_t, struct ucred *, 287 struct thread *); 288static int cryptof_ioctl(struct file *, u_long, void *, 289 struct ucred *, struct thread *); 290static int cryptof_poll(struct file *, int, struct ucred *, struct thread *); 291static int cryptof_kqfilter(struct file *, struct knote *); 292static int cryptof_stat(struct file *, struct stat *, 293 struct ucred *, struct thread *); 294static int cryptof_close(struct file *, struct thread *); 295 296static struct fileops cryptofops = { 297 .fo_read = cryptof_rw, 298 .fo_write = cryptof_rw, 299 .fo_truncate = cryptof_truncate, 300 .fo_ioctl = cryptof_ioctl, 301 .fo_poll = cryptof_poll, 302 .fo_kqfilter = cryptof_kqfilter, 303 .fo_stat = cryptof_stat, 304 .fo_close = cryptof_close, 305 .fo_chmod = invfo_chmod, 306 .fo_chown = invfo_chown, 307}; 308 309static struct csession *csefind(struct fcrypt *, u_int); 310static int csedelete(struct fcrypt *, struct csession *); 311static struct csession *cseadd(struct fcrypt *, struct csession *); 312static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t, 313 u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *, 314 struct auth_hash *); 315static int csefree(struct csession *); 316 317static int cryptodev_op(struct csession *, struct crypt_op *, 318 struct ucred *, struct thread *td); 319static int cryptodev_key(struct crypt_kop *); 320static int cryptodev_find(struct crypt_find_op *); 321 322static int 323cryptof_rw( 324 struct file *fp, 325 struct uio *uio, 326 struct ucred *active_cred, 327 int flags, 328 struct thread *td) 329{ 330 331 return (EIO); 332} 333 334static int 335cryptof_truncate( 336 struct file *fp, 337 off_t length, 338 struct ucred *active_cred, 339 struct thread *td) 340{ 341 342 return (EINVAL); 343} 344 345/* 346 * Check a crypto identifier to see if it requested 347 * a software device/driver. This can be done either 348 * by device name/class or through search constraints. 349 */ 350static int 351checkforsoftware(int crid) 352{ 353 if (crid & CRYPTOCAP_F_SOFTWARE) 354 return EINVAL; /* XXX */ 355 if ((crid & CRYPTOCAP_F_HARDWARE) == 0 && 356 (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0) 357 return EINVAL; /* XXX */ 358 return 0; 359} 360 361/* ARGSUSED */ 362static int 363cryptof_ioctl( 364 struct file *fp, 365 u_long cmd, 366 void *data, 367 struct ucred *active_cred, 368 struct thread *td) 369{ 370#define SES2(p) ((struct session2_op *)p) 371 struct cryptoini cria, crie; 372 struct fcrypt *fcr = fp->f_data; 373 struct csession *cse; 374 struct session_op *sop; 375 struct crypt_op *cop; 376 struct enc_xform *txform = NULL; 377 struct auth_hash *thash = NULL; 378 struct crypt_kop *kop; 379 u_int64_t sid; 380 u_int32_t ses; 381 int error = 0, crid; 382#ifdef COMPAT_FREEBSD32 383 struct session2_op sopc; 384 struct crypt_op copc; 385 struct crypt_kop kopc; 386#endif 387 388 switch (cmd) { 389 case CIOCGSESSION: 390 case CIOCGSESSION2: 391#ifdef COMPAT_FREEBSD32 392 case CIOCGSESSION32: 393 case CIOCGSESSION232: 394 if (cmd == CIOCGSESSION32) { 395 session_op_from_32(data, (struct session_op *)&sopc); 396 sop = (struct session_op *)&sopc; 397 } else if (cmd == CIOCGSESSION232) { 398 session2_op_from_32(data, &sopc); 399 sop = (struct session_op *)&sopc; 400 } else 401#endif 402 sop = (struct session_op *)data; 403 switch (sop->cipher) { 404 case 0: 405 break; 406 case CRYPTO_DES_CBC: 407 txform = &enc_xform_des; 408 break; 409 case CRYPTO_3DES_CBC: 410 txform = &enc_xform_3des; 411 break; 412 case CRYPTO_BLF_CBC: 413 txform = &enc_xform_blf; 414 break; 415 case CRYPTO_CAST_CBC: 416 txform = &enc_xform_cast5; 417 break; 418 case CRYPTO_SKIPJACK_CBC: 419 txform = &enc_xform_skipjack; 420 break; 421 case CRYPTO_AES_CBC: 422 txform = &enc_xform_rijndael128; 423 break; 424 case CRYPTO_AES_XTS: 425 txform = &enc_xform_aes_xts; 426 break; 427 case CRYPTO_NULL_CBC: 428 txform = &enc_xform_null; 429 break; 430 case CRYPTO_ARC4: 431 txform = &enc_xform_arc4; 432 break; 433 case CRYPTO_CAMELLIA_CBC: 434 txform = &enc_xform_camellia; 435 break; 436 default: 437 return (EINVAL); 438 } 439 440 switch (sop->mac) { 441 case 0: 442 break; 443 case CRYPTO_MD5_HMAC: 444 thash = &auth_hash_hmac_md5; 445 break; 446 case CRYPTO_SHA1_HMAC: 447 thash = &auth_hash_hmac_sha1; 448 break; 449 case CRYPTO_SHA2_256_HMAC: 450 thash = &auth_hash_hmac_sha2_256; 451 break; 452 case CRYPTO_SHA2_384_HMAC: 453 thash = &auth_hash_hmac_sha2_384; 454 break; 455 case CRYPTO_SHA2_512_HMAC: 456 thash = &auth_hash_hmac_sha2_512; 457 break; 458 case CRYPTO_RIPEMD160_HMAC: 459 thash = &auth_hash_hmac_ripemd_160; 460 break; 461#ifdef notdef 462 case CRYPTO_MD5: 463 thash = &auth_hash_md5; 464 break; 465 case CRYPTO_SHA1: 466 thash = &auth_hash_sha1; 467 break; 468#endif 469 case CRYPTO_NULL_HMAC: 470 thash = &auth_hash_null; 471 break; 472 default: 473 return (EINVAL); 474 } 475 476 bzero(&crie, sizeof(crie)); 477 bzero(&cria, sizeof(cria)); 478 479 if (txform) { 480 crie.cri_alg = txform->type; 481 crie.cri_klen = sop->keylen * 8; 482 if (sop->keylen > txform->maxkey || 483 sop->keylen < txform->minkey) { 484 error = EINVAL; 485 goto bail; 486 } 487 488 crie.cri_key = malloc(crie.cri_klen / 8, 489 M_XDATA, M_WAITOK); 490 if ((error = copyin(sop->key, crie.cri_key, 491 crie.cri_klen / 8))) 492 goto bail; 493 if (thash) 494 crie.cri_next = &cria; 495 } 496 497 if (thash) { 498 cria.cri_alg = thash->type; 499 cria.cri_klen = sop->mackeylen * 8; 500 if (sop->mackeylen != thash->keysize) { 501 error = EINVAL; 502 goto bail; 503 } 504 505 if (cria.cri_klen) { 506 cria.cri_key = malloc(cria.cri_klen / 8, 507 M_XDATA, M_WAITOK); 508 if ((error = copyin(sop->mackey, cria.cri_key, 509 cria.cri_klen / 8))) 510 goto bail; 511 } 512 } 513 514 /* NB: CIOCGSESSION2 has the crid */ 515 if (cmd == CIOCGSESSION2 516#ifdef COMPAT_FREEBSD32 517 || cmd == CIOCGSESSION232 518#endif 519 ) { 520 crid = SES2(sop)->crid; 521 error = checkforsoftware(crid); 522 if (error) 523 goto bail; 524 } else 525 crid = CRYPTOCAP_F_HARDWARE; 526 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid); 527 if (error) 528 goto bail; 529 530 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen, 531 cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform, 532 thash); 533 534 if (cse == NULL) { 535 crypto_freesession(sid); 536 error = EINVAL; 537 goto bail; 538 } 539 sop->ses = cse->ses; 540 if (cmd == CIOCGSESSION2 541#ifdef COMPAT_FREEBSD32 542 || cmd == CIOCGSESSION232 543#endif 544 ) { 545 /* return hardware/driver id */ 546 SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid); 547 } 548bail: 549 if (error) { 550 if (crie.cri_key) 551 free(crie.cri_key, M_XDATA); 552 if (cria.cri_key) 553 free(cria.cri_key, M_XDATA); 554 } 555#ifdef COMPAT_FREEBSD32 556 else { 557 if (cmd == CIOCGSESSION32) 558 session_op_to_32(sop, data); 559 else if (cmd == CIOCGSESSION232) 560 session2_op_to_32((struct session2_op *)sop, 561 data); 562 } 563#endif 564 break; 565 case CIOCFSESSION: 566 ses = *(u_int32_t *)data; 567 cse = csefind(fcr, ses); 568 if (cse == NULL) 569 return (EINVAL); 570 csedelete(fcr, cse); 571 error = csefree(cse); 572 break; 573 case CIOCCRYPT: 574#ifdef COMPAT_FREEBSD32 575 case CIOCCRYPT32: 576 if (cmd == CIOCCRYPT32) { 577 cop = &copc; 578 crypt_op_from_32(data, cop); 579 } else 580#endif 581 cop = (struct crypt_op *)data; 582 cse = csefind(fcr, cop->ses); 583 if (cse == NULL) 584 return (EINVAL); 585 error = cryptodev_op(cse, cop, active_cred, td); 586#ifdef COMPAT_FREEBSD32 587 if (error == 0 && cmd == CIOCCRYPT32) 588 crypt_op_to_32(cop, data); 589#endif 590 break; 591 case CIOCKEY: 592 case CIOCKEY2: 593#ifdef COMPAT_FREEBSD32 594 case CIOCKEY32: 595 case CIOCKEY232: 596#endif 597 if (!crypto_userasymcrypto) 598 return (EPERM); /* XXX compat? */ 599#ifdef COMPAT_FREEBSD32 600 if (cmd == CIOCKEY32 || cmd == CIOCKEY232) { 601 kop = &kopc; 602 crypt_kop_from_32(data, kop); 603 } else 604#endif 605 kop = (struct crypt_kop *)data; 606 if (cmd == CIOCKEY 607#ifdef COMPAT_FREEBSD32 608 || cmd == CIOCKEY32 609#endif 610 ) { 611 /* NB: crypto core enforces s/w driver use */ 612 kop->crk_crid = 613 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 614 } 615 mtx_lock(&Giant); 616 error = cryptodev_key(kop); 617 mtx_unlock(&Giant); 618#ifdef COMPAT_FREEBSD32 619 if (cmd == CIOCKEY32 || cmd == CIOCKEY232) 620 crypt_kop_to_32(kop, data); 621#endif 622 break; 623 case CIOCASYMFEAT: 624 if (!crypto_userasymcrypto) { 625 /* 626 * NB: if user asym crypto operations are 627 * not permitted return "no algorithms" 628 * so well-behaved applications will just 629 * fallback to doing them in software. 630 */ 631 *(int *)data = 0; 632 } else 633 error = crypto_getfeat((int *)data); 634 break; 635 case CIOCFINDDEV: 636 error = cryptodev_find((struct crypt_find_op *)data); 637 break; 638 default: 639 error = EINVAL; 640 break; 641 } 642 return (error); 643#undef SES2 644} 645 646static int cryptodev_cb(void *); 647 648 649static int 650cryptodev_op( 651 struct csession *cse, 652 struct crypt_op *cop, 653 struct ucred *active_cred, 654 struct thread *td) 655{ 656 struct cryptop *crp = NULL; 657 struct cryptodesc *crde = NULL, *crda = NULL; 658 int error; 659 660 if (cop->len > 256*1024-4) 661 return (E2BIG); 662 663 if (cse->txform) { 664 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0) 665 return (EINVAL); 666 } 667 668 cse->uio.uio_iov = &cse->iovec; 669 cse->uio.uio_iovcnt = 1; 670 cse->uio.uio_offset = 0; 671 cse->uio.uio_resid = cop->len; 672 cse->uio.uio_segflg = UIO_SYSSPACE; 673 cse->uio.uio_rw = UIO_WRITE; 674 cse->uio.uio_td = td; 675 cse->uio.uio_iov[0].iov_len = cop->len; 676 if (cse->thash) { 677 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize; 678 cse->uio.uio_resid += cse->thash->hashsize; 679 } 680 cse->uio.uio_iov[0].iov_base = malloc(cse->uio.uio_iov[0].iov_len, 681 M_XDATA, M_WAITOK); 682 683 crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL)); 684 if (crp == NULL) { 685 error = ENOMEM; 686 goto bail; 687 } 688 689 if (cse->thash) { 690 crda = crp->crp_desc; 691 if (cse->txform) 692 crde = crda->crd_next; 693 } else { 694 if (cse->txform) 695 crde = crp->crp_desc; 696 else { 697 error = EINVAL; 698 goto bail; 699 } 700 } 701 702 if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len))) 703 goto bail; 704 705 if (crda) { 706 crda->crd_skip = 0; 707 crda->crd_len = cop->len; 708 crda->crd_inject = cop->len; 709 710 crda->crd_alg = cse->mac; 711 crda->crd_key = cse->mackey; 712 crda->crd_klen = cse->mackeylen * 8; 713 } 714 715 if (crde) { 716 if (cop->op == COP_ENCRYPT) 717 crde->crd_flags |= CRD_F_ENCRYPT; 718 else 719 crde->crd_flags &= ~CRD_F_ENCRYPT; 720 crde->crd_len = cop->len; 721 crde->crd_inject = 0; 722 723 crde->crd_alg = cse->cipher; 724 crde->crd_key = cse->key; 725 crde->crd_klen = cse->keylen * 8; 726 } 727 728 crp->crp_ilen = cop->len; 729 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM 730 | (cop->flags & COP_F_BATCH); 731 crp->crp_buf = (caddr_t)&cse->uio; 732 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb; 733 crp->crp_sid = cse->sid; 734 crp->crp_opaque = (void *)cse; 735 736 if (cop->iv) { 737 if (crde == NULL) { 738 error = EINVAL; 739 goto bail; 740 } 741 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 742 error = EINVAL; 743 goto bail; 744 } 745 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize))) 746 goto bail; 747 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize); 748 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 749 crde->crd_skip = 0; 750 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 751 crde->crd_skip = 0; 752 } else if (crde) { 753 crde->crd_flags |= CRD_F_IV_PRESENT; 754 crde->crd_skip = cse->txform->blocksize; 755 crde->crd_len -= cse->txform->blocksize; 756 } 757 758 if (cop->mac && crda == NULL) { 759 error = EINVAL; 760 goto bail; 761 } 762 763again: 764 /* 765 * Let the dispatch run unlocked, then, interlock against the 766 * callback before checking if the operation completed and going 767 * to sleep. This insures drivers don't inherit our lock which 768 * results in a lock order reversal between crypto_dispatch forced 769 * entry and the crypto_done callback into us. 770 */ 771 error = crypto_dispatch(crp); 772 mtx_lock(&cse->lock); 773 if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0) 774 error = msleep(crp, &cse->lock, PWAIT, "crydev", 0); 775 mtx_unlock(&cse->lock); 776 777 if (error != 0) 778 goto bail; 779 780 if (crp->crp_etype == EAGAIN) { 781 crp->crp_etype = 0; 782 crp->crp_flags &= ~CRYPTO_F_DONE; 783 goto again; 784 } 785 786 if (crp->crp_etype != 0) { 787 error = crp->crp_etype; 788 goto bail; 789 } 790 791 if (cse->error) { 792 error = cse->error; 793 goto bail; 794 } 795 796 if (cop->dst && 797 (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len))) 798 goto bail; 799 800 if (cop->mac && 801 (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len, 802 cop->mac, cse->thash->hashsize))) 803 goto bail; 804 805bail: 806 if (crp) 807 crypto_freereq(crp); 808 if (cse->uio.uio_iov[0].iov_base) 809 free(cse->uio.uio_iov[0].iov_base, M_XDATA); 810 811 return (error); 812} 813 814static int 815cryptodev_cb(void *op) 816{ 817 struct cryptop *crp = (struct cryptop *) op; 818 struct csession *cse = (struct csession *)crp->crp_opaque; 819 820 mtx_lock(&cse->lock); 821 cse->error = crp->crp_etype; 822 wakeup_one(crp); 823 mtx_unlock(&cse->lock); 824 return (0); 825} 826 827static int 828cryptodevkey_cb(void *op) 829{ 830 struct cryptkop *krp = (struct cryptkop *) op; 831 832 wakeup_one(krp); 833 return (0); 834} 835 836static int 837cryptodev_key(struct crypt_kop *kop) 838{ 839 struct cryptkop *krp = NULL; 840 int error = EINVAL; 841 int in, out, size, i; 842 843 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) { 844 return (EFBIG); 845 } 846 847 in = kop->crk_iparams; 848 out = kop->crk_oparams; 849 switch (kop->crk_op) { 850 case CRK_MOD_EXP: 851 if (in == 3 && out == 1) 852 break; 853 return (EINVAL); 854 case CRK_MOD_EXP_CRT: 855 if (in == 6 && out == 1) 856 break; 857 return (EINVAL); 858 case CRK_DSA_SIGN: 859 if (in == 5 && out == 2) 860 break; 861 return (EINVAL); 862 case CRK_DSA_VERIFY: 863 if (in == 7 && out == 0) 864 break; 865 return (EINVAL); 866 case CRK_DH_COMPUTE_KEY: 867 if (in == 3 && out == 1) 868 break; 869 return (EINVAL); 870 default: 871 return (EINVAL); 872 } 873 874 krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK|M_ZERO); 875 if (!krp) 876 return (ENOMEM); 877 krp->krp_op = kop->crk_op; 878 krp->krp_status = kop->crk_status; 879 krp->krp_iparams = kop->crk_iparams; 880 krp->krp_oparams = kop->crk_oparams; 881 krp->krp_crid = kop->crk_crid; 882 krp->krp_status = 0; 883 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb; 884 885 for (i = 0; i < CRK_MAXPARAM; i++) { 886 if (kop->crk_param[i].crp_nbits > 65536) 887 /* Limit is the same as in OpenBSD */ 888 goto fail; 889 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits; 890 } 891 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) { 892 size = (krp->krp_param[i].crp_nbits + 7) / 8; 893 if (size == 0) 894 continue; 895 krp->krp_param[i].crp_p = malloc(size, M_XDATA, M_WAITOK); 896 if (i >= krp->krp_iparams) 897 continue; 898 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size); 899 if (error) 900 goto fail; 901 } 902 903 error = crypto_kdispatch(krp); 904 if (error) 905 goto fail; 906 error = tsleep(krp, PSOCK, "crydev", 0); 907 if (error) { 908 /* XXX can this happen? if so, how do we recover? */ 909 goto fail; 910 } 911 912 kop->crk_crid = krp->krp_crid; /* device that did the work */ 913 if (krp->krp_status != 0) { 914 error = krp->krp_status; 915 goto fail; 916 } 917 918 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) { 919 size = (krp->krp_param[i].crp_nbits + 7) / 8; 920 if (size == 0) 921 continue; 922 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size); 923 if (error) 924 goto fail; 925 } 926 927fail: 928 if (krp) { 929 kop->crk_status = krp->krp_status; 930 for (i = 0; i < CRK_MAXPARAM; i++) { 931 if (krp->krp_param[i].crp_p) 932 free(krp->krp_param[i].crp_p, M_XDATA); 933 } 934 free(krp, M_XDATA); 935 } 936 return (error); 937} 938 939static int 940cryptodev_find(struct crypt_find_op *find) 941{ 942 device_t dev; 943 944 if (find->crid != -1) { 945 dev = crypto_find_device_byhid(find->crid); 946 if (dev == NULL) 947 return (ENOENT); 948 strlcpy(find->name, device_get_nameunit(dev), 949 sizeof(find->name)); 950 } else { 951 find->crid = crypto_find_driver(find->name); 952 if (find->crid == -1) 953 return (ENOENT); 954 } 955 return (0); 956} 957 958/* ARGSUSED */ 959static int 960cryptof_poll( 961 struct file *fp, 962 int events, 963 struct ucred *active_cred, 964 struct thread *td) 965{ 966 967 return (0); 968} 969 970/* ARGSUSED */ 971static int 972cryptof_kqfilter(struct file *fp, struct knote *kn) 973{ 974 975 return (0); 976} 977 978/* ARGSUSED */ 979static int 980cryptof_stat( 981 struct file *fp, 982 struct stat *sb, 983 struct ucred *active_cred, 984 struct thread *td) 985{ 986 987 return (EOPNOTSUPP); 988} 989 990/* ARGSUSED */ 991static int 992cryptof_close(struct file *fp, struct thread *td) 993{ 994 struct fcrypt *fcr = fp->f_data; 995 struct csession *cse; 996 997 while ((cse = TAILQ_FIRST(&fcr->csessions))) { 998 TAILQ_REMOVE(&fcr->csessions, cse, next); 999 (void)csefree(cse); 1000 } 1001 free(fcr, M_XDATA); 1002 fp->f_data = NULL; 1003 return 0; 1004} 1005 1006static struct csession * 1007csefind(struct fcrypt *fcr, u_int ses) 1008{ 1009 struct csession *cse; 1010 1011 TAILQ_FOREACH(cse, &fcr->csessions, next) 1012 if (cse->ses == ses) 1013 return (cse); 1014 return (NULL); 1015} 1016 1017static int 1018csedelete(struct fcrypt *fcr, struct csession *cse_del) 1019{ 1020 struct csession *cse; 1021 1022 TAILQ_FOREACH(cse, &fcr->csessions, next) { 1023 if (cse == cse_del) { 1024 TAILQ_REMOVE(&fcr->csessions, cse, next); 1025 return (1); 1026 } 1027 } 1028 return (0); 1029} 1030 1031static struct csession * 1032cseadd(struct fcrypt *fcr, struct csession *cse) 1033{ 1034 TAILQ_INSERT_TAIL(&fcr->csessions, cse, next); 1035 cse->ses = fcr->sesn++; 1036 return (cse); 1037} 1038 1039struct csession * 1040csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen, 1041 caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac, 1042 struct enc_xform *txform, struct auth_hash *thash) 1043{ 1044 struct csession *cse; 1045 1046#ifdef INVARIANTS 1047 /* NB: required when mtx_init is built with INVARIANTS */ 1048 cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT | M_ZERO); 1049#else 1050 cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT); 1051#endif 1052 if (cse == NULL) 1053 return NULL; 1054 mtx_init(&cse->lock, "cryptodev", "crypto session lock", MTX_DEF); 1055 cse->key = key; 1056 cse->keylen = keylen/8; 1057 cse->mackey = mackey; 1058 cse->mackeylen = mackeylen/8; 1059 cse->sid = sid; 1060 cse->cipher = cipher; 1061 cse->mac = mac; 1062 cse->txform = txform; 1063 cse->thash = thash; 1064 cseadd(fcr, cse); 1065 return (cse); 1066} 1067 1068static int 1069csefree(struct csession *cse) 1070{ 1071 int error; 1072 1073 error = crypto_freesession(cse->sid); 1074 mtx_destroy(&cse->lock); 1075 if (cse->key) 1076 free(cse->key, M_XDATA); 1077 if (cse->mackey) 1078 free(cse->mackey, M_XDATA); 1079 free(cse, M_XDATA); 1080 return (error); 1081} 1082 1083static int 1084cryptoopen(struct cdev *dev, int oflags, int devtype, struct thread *td) 1085{ 1086 return (0); 1087} 1088 1089static int 1090cryptoread(struct cdev *dev, struct uio *uio, int ioflag) 1091{ 1092 return (EIO); 1093} 1094 1095static int 1096cryptowrite(struct cdev *dev, struct uio *uio, int ioflag) 1097{ 1098 return (EIO); 1099} 1100 1101static int 1102cryptoioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 1103{ 1104 struct file *f; 1105 struct fcrypt *fcr; 1106 int fd, error; 1107 1108 switch (cmd) { 1109 case CRIOGET: 1110 fcr = malloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK); 1111 TAILQ_INIT(&fcr->csessions); 1112 fcr->sesn = 0; 1113 1114 error = falloc(td, &f, &fd, 0); 1115 1116 if (error) { 1117 free(fcr, M_XDATA); 1118 return (error); 1119 } 1120 /* falloc automatically provides an extra reference to 'f'. */ 1121 finit(f, FREAD | FWRITE, DTYPE_CRYPTO, fcr, &cryptofops); 1122 *(u_int32_t *)data = fd; 1123 fdrop(f, td); 1124 break; 1125 case CRIOFINDDEV: 1126 error = cryptodev_find((struct crypt_find_op *)data); 1127 break; 1128 case CRIOASYMFEAT: 1129 error = crypto_getfeat((int *)data); 1130 break; 1131 default: 1132 error = EINVAL; 1133 break; 1134 } 1135 return (error); 1136} 1137 1138static struct cdevsw crypto_cdevsw = { 1139 .d_version = D_VERSION, 1140 .d_flags = D_NEEDGIANT, 1141 .d_open = cryptoopen, 1142 .d_read = cryptoread, 1143 .d_write = cryptowrite, 1144 .d_ioctl = cryptoioctl, 1145 .d_name = "crypto", 1146}; 1147static struct cdev *crypto_dev; 1148 1149/* 1150 * Initialization code, both for static and dynamic loading. 1151 */ 1152static int 1153cryptodev_modevent(module_t mod, int type, void *unused) 1154{ 1155 switch (type) { 1156 case MOD_LOAD: 1157 if (bootverbose) 1158 printf("crypto: <crypto device>\n"); 1159 crypto_dev = make_dev(&crypto_cdevsw, 0, 1160 UID_ROOT, GID_WHEEL, 0666, 1161 "crypto"); 1162 return 0; 1163 case MOD_UNLOAD: 1164 /*XXX disallow if active sessions */ 1165 destroy_dev(crypto_dev); 1166 return 0; 1167 } 1168 return EINVAL; 1169} 1170 1171static moduledata_t cryptodev_mod = { 1172 "cryptodev", 1173 cryptodev_modevent, 1174 NULL 1175}; 1176MODULE_VERSION(cryptodev, 1); 1177DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1178MODULE_DEPEND(cryptodev, crypto, 1, 1, 1); 1179MODULE_DEPEND(cryptodev, zlib, 1, 1, 1); 1180