cryptodev.c revision 210631
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 210631 2010-07-29 20:42:20Z kib $"); 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}; 306 307static struct csession *csefind(struct fcrypt *, u_int); 308static int csedelete(struct fcrypt *, struct csession *); 309static struct csession *cseadd(struct fcrypt *, struct csession *); 310static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t, 311 u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *, 312 struct auth_hash *); 313static int csefree(struct csession *); 314 315static int cryptodev_op(struct csession *, struct crypt_op *, 316 struct ucred *, struct thread *td); 317static int cryptodev_key(struct crypt_kop *); 318static int cryptodev_find(struct crypt_find_op *); 319 320static int 321cryptof_rw( 322 struct file *fp, 323 struct uio *uio, 324 struct ucred *active_cred, 325 int flags, 326 struct thread *td) 327{ 328 329 return (EIO); 330} 331 332static int 333cryptof_truncate( 334 struct file *fp, 335 off_t length, 336 struct ucred *active_cred, 337 struct thread *td) 338{ 339 340 return (EINVAL); 341} 342 343/* 344 * Check a crypto identifier to see if it requested 345 * a software device/driver. This can be done either 346 * by device name/class or through search constraints. 347 */ 348static int 349checkforsoftware(int crid) 350{ 351 if (crid & CRYPTOCAP_F_SOFTWARE) 352 return EINVAL; /* XXX */ 353 if ((crid & CRYPTOCAP_F_HARDWARE) == 0 && 354 (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0) 355 return EINVAL; /* XXX */ 356 return 0; 357} 358 359/* ARGSUSED */ 360static int 361cryptof_ioctl( 362 struct file *fp, 363 u_long cmd, 364 void *data, 365 struct ucred *active_cred, 366 struct thread *td) 367{ 368#define SES2(p) ((struct session2_op *)p) 369 struct cryptoini cria, crie; 370 struct fcrypt *fcr = fp->f_data; 371 struct csession *cse; 372 struct session_op *sop; 373 struct crypt_op *cop; 374 struct enc_xform *txform = NULL; 375 struct auth_hash *thash = NULL; 376 struct crypt_kop *kop; 377 u_int64_t sid; 378 u_int32_t ses; 379 int error = 0, crid; 380#ifdef COMPAT_FREEBSD32 381 struct session2_op sopc; 382 struct crypt_op copc; 383 struct crypt_kop kopc; 384#endif 385 386 switch (cmd) { 387 case CIOCGSESSION: 388 case CIOCGSESSION2: 389#ifdef COMPAT_FREEBSD32 390 case CIOCGSESSION32: 391 case CIOCGSESSION232: 392 if (cmd == CIOCGSESSION32) { 393 session_op_from_32(data, (struct session_op *)&sopc); 394 sop = (struct session_op *)&sopc; 395 } else if (cmd == CIOCGSESSION232) { 396 session2_op_from_32(data, &sopc); 397 sop = (struct session_op *)&sopc; 398 } else 399#endif 400 sop = (struct session_op *)data; 401 switch (sop->cipher) { 402 case 0: 403 break; 404 case CRYPTO_DES_CBC: 405 txform = &enc_xform_des; 406 break; 407 case CRYPTO_3DES_CBC: 408 txform = &enc_xform_3des; 409 break; 410 case CRYPTO_BLF_CBC: 411 txform = &enc_xform_blf; 412 break; 413 case CRYPTO_CAST_CBC: 414 txform = &enc_xform_cast5; 415 break; 416 case CRYPTO_SKIPJACK_CBC: 417 txform = &enc_xform_skipjack; 418 break; 419 case CRYPTO_AES_CBC: 420 txform = &enc_xform_rijndael128; 421 break; 422 case CRYPTO_NULL_CBC: 423 txform = &enc_xform_null; 424 break; 425 case CRYPTO_ARC4: 426 txform = &enc_xform_arc4; 427 break; 428 case CRYPTO_CAMELLIA_CBC: 429 txform = &enc_xform_camellia; 430 break; 431 default: 432 return (EINVAL); 433 } 434 435 switch (sop->mac) { 436 case 0: 437 break; 438 case CRYPTO_MD5_HMAC: 439 thash = &auth_hash_hmac_md5; 440 break; 441 case CRYPTO_SHA1_HMAC: 442 thash = &auth_hash_hmac_sha1; 443 break; 444 case CRYPTO_SHA2_256_HMAC: 445 thash = &auth_hash_hmac_sha2_256; 446 break; 447 case CRYPTO_SHA2_384_HMAC: 448 thash = &auth_hash_hmac_sha2_384; 449 break; 450 case CRYPTO_SHA2_512_HMAC: 451 thash = &auth_hash_hmac_sha2_512; 452 break; 453 case CRYPTO_RIPEMD160_HMAC: 454 thash = &auth_hash_hmac_ripemd_160; 455 break; 456#ifdef notdef 457 case CRYPTO_MD5: 458 thash = &auth_hash_md5; 459 break; 460 case CRYPTO_SHA1: 461 thash = &auth_hash_sha1; 462 break; 463#endif 464 case CRYPTO_NULL_HMAC: 465 thash = &auth_hash_null; 466 break; 467 default: 468 return (EINVAL); 469 } 470 471 bzero(&crie, sizeof(crie)); 472 bzero(&cria, sizeof(cria)); 473 474 if (txform) { 475 crie.cri_alg = txform->type; 476 crie.cri_klen = sop->keylen * 8; 477 if (sop->keylen > txform->maxkey || 478 sop->keylen < txform->minkey) { 479 error = EINVAL; 480 goto bail; 481 } 482 483 crie.cri_key = malloc(crie.cri_klen / 8, 484 M_XDATA, M_WAITOK); 485 if ((error = copyin(sop->key, crie.cri_key, 486 crie.cri_klen / 8))) 487 goto bail; 488 if (thash) 489 crie.cri_next = &cria; 490 } 491 492 if (thash) { 493 cria.cri_alg = thash->type; 494 cria.cri_klen = sop->mackeylen * 8; 495 if (sop->mackeylen != thash->keysize) { 496 error = EINVAL; 497 goto bail; 498 } 499 500 if (cria.cri_klen) { 501 cria.cri_key = malloc(cria.cri_klen / 8, 502 M_XDATA, M_WAITOK); 503 if ((error = copyin(sop->mackey, cria.cri_key, 504 cria.cri_klen / 8))) 505 goto bail; 506 } 507 } 508 509 /* NB: CIOGSESSION2 has the crid */ 510 if (cmd == CIOCGSESSION2 511#ifdef COMPAT_FREEBSD32 512 || cmd == CIOCGSESSION232 513#endif 514 ) { 515 crid = SES2(sop)->crid; 516 error = checkforsoftware(crid); 517 if (error) 518 goto bail; 519 } else 520 crid = CRYPTOCAP_F_HARDWARE; 521 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid); 522 if (error) 523 goto bail; 524 525 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen, 526 cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform, 527 thash); 528 529 if (cse == NULL) { 530 crypto_freesession(sid); 531 error = EINVAL; 532 goto bail; 533 } 534 sop->ses = cse->ses; 535 if (cmd == CIOCGSESSION2 536#ifdef COMPAT_FREEBSD32 537 || cmd == CIOCGSESSION232 538#endif 539 ) { 540 /* return hardware/driver id */ 541 SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid); 542 } 543bail: 544 if (error) { 545 if (crie.cri_key) 546 free(crie.cri_key, M_XDATA); 547 if (cria.cri_key) 548 free(cria.cri_key, M_XDATA); 549 } 550#ifdef COMPAT_FREEBSD32 551 else { 552 if (cmd == CIOCGSESSION32) 553 session_op_to_32(sop, data); 554 else if (cmd == CIOCGSESSION232) 555 session2_op_to_32((struct session2_op *)sop, 556 data); 557 } 558#endif 559 break; 560 case CIOCFSESSION: 561 ses = *(u_int32_t *)data; 562 cse = csefind(fcr, ses); 563 if (cse == NULL) 564 return (EINVAL); 565 csedelete(fcr, cse); 566 error = csefree(cse); 567 break; 568 case CIOCCRYPT: 569#ifdef COMPAT_FREEBSD32 570 case CIOCCRYPT32: 571 if (cmd == CIOCCRYPT32) { 572 cop = &copc; 573 crypt_op_from_32(data, cop); 574 } else 575#endif 576 cop = (struct crypt_op *)data; 577 cse = csefind(fcr, cop->ses); 578 if (cse == NULL) 579 return (EINVAL); 580 error = cryptodev_op(cse, cop, active_cred, td); 581#ifdef COMPAT_FREEBSD32 582 if (error == 0 && cmd == CIOCCRYPT32) 583 crypt_op_to_32(cop, data); 584#endif 585 break; 586 case CIOCKEY: 587 case CIOCKEY2: 588#ifdef COMPAT_FREEBSD32 589 case CIOCKEY32: 590 case CIOCKEY232: 591#endif 592 if (!crypto_userasymcrypto) 593 return (EPERM); /* XXX compat? */ 594#ifdef COMPAT_FREEBSD32 595 if (cmd == CIOCKEY32 || cmd == CIOCKEY232) { 596 kop = &kopc; 597 crypt_kop_from_32(data, kop); 598 } else 599#endif 600 kop = (struct crypt_kop *)data; 601 if (cmd == CIOCKEY 602#ifdef COMPAT_FREEBSD32 603 || cmd == CIOCKEY32 604#endif 605 ) { 606 /* NB: crypto core enforces s/w driver use */ 607 kop->crk_crid = 608 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 609 } 610 mtx_lock(&Giant); 611 error = cryptodev_key(kop); 612 mtx_unlock(&Giant); 613#ifdef COMPAT_FREEBSD32 614 if (cmd == CIOCKEY32 || cmd == CIOCKEY232) 615 crypt_kop_to_32(kop, data); 616#endif 617 break; 618 case CIOCASYMFEAT: 619 if (!crypto_userasymcrypto) { 620 /* 621 * NB: if user asym crypto operations are 622 * not permitted return "no algorithms" 623 * so well-behaved applications will just 624 * fallback to doing them in software. 625 */ 626 *(int *)data = 0; 627 } else 628 error = crypto_getfeat((int *)data); 629 break; 630 case CIOCFINDDEV: 631 error = cryptodev_find((struct crypt_find_op *)data); 632 break; 633 default: 634 error = EINVAL; 635 break; 636 } 637 return (error); 638#undef SES2 639} 640 641static int cryptodev_cb(void *); 642 643 644static int 645cryptodev_op( 646 struct csession *cse, 647 struct crypt_op *cop, 648 struct ucred *active_cred, 649 struct thread *td) 650{ 651 struct cryptop *crp = NULL; 652 struct cryptodesc *crde = NULL, *crda = NULL; 653 int error; 654 655 if (cop->len > 256*1024-4) 656 return (E2BIG); 657 658 if (cse->txform) { 659 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0) 660 return (EINVAL); 661 } 662 663 cse->uio.uio_iov = &cse->iovec; 664 cse->uio.uio_iovcnt = 1; 665 cse->uio.uio_offset = 0; 666 cse->uio.uio_resid = cop->len; 667 cse->uio.uio_segflg = UIO_SYSSPACE; 668 cse->uio.uio_rw = UIO_WRITE; 669 cse->uio.uio_td = td; 670 cse->uio.uio_iov[0].iov_len = cop->len; 671 if (cse->thash) { 672 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize; 673 cse->uio.uio_resid += cse->thash->hashsize; 674 } 675 cse->uio.uio_iov[0].iov_base = malloc(cse->uio.uio_iov[0].iov_len, 676 M_XDATA, M_WAITOK); 677 678 crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL)); 679 if (crp == NULL) { 680 error = ENOMEM; 681 goto bail; 682 } 683 684 if (cse->thash) { 685 crda = crp->crp_desc; 686 if (cse->txform) 687 crde = crda->crd_next; 688 } else { 689 if (cse->txform) 690 crde = crp->crp_desc; 691 else { 692 error = EINVAL; 693 goto bail; 694 } 695 } 696 697 if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len))) 698 goto bail; 699 700 if (crda) { 701 crda->crd_skip = 0; 702 crda->crd_len = cop->len; 703 crda->crd_inject = cop->len; 704 705 crda->crd_alg = cse->mac; 706 crda->crd_key = cse->mackey; 707 crda->crd_klen = cse->mackeylen * 8; 708 } 709 710 if (crde) { 711 if (cop->op == COP_ENCRYPT) 712 crde->crd_flags |= CRD_F_ENCRYPT; 713 else 714 crde->crd_flags &= ~CRD_F_ENCRYPT; 715 crde->crd_len = cop->len; 716 crde->crd_inject = 0; 717 718 crde->crd_alg = cse->cipher; 719 crde->crd_key = cse->key; 720 crde->crd_klen = cse->keylen * 8; 721 } 722 723 crp->crp_ilen = cop->len; 724 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM 725 | (cop->flags & COP_F_BATCH); 726 crp->crp_buf = (caddr_t)&cse->uio; 727 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb; 728 crp->crp_sid = cse->sid; 729 crp->crp_opaque = (void *)cse; 730 731 if (cop->iv) { 732 if (crde == NULL) { 733 error = EINVAL; 734 goto bail; 735 } 736 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 737 error = EINVAL; 738 goto bail; 739 } 740 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize))) 741 goto bail; 742 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize); 743 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 744 crde->crd_skip = 0; 745 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 746 crde->crd_skip = 0; 747 } else if (crde) { 748 crde->crd_flags |= CRD_F_IV_PRESENT; 749 crde->crd_skip = cse->txform->blocksize; 750 crde->crd_len -= cse->txform->blocksize; 751 } 752 753 if (cop->mac && crda == NULL) { 754 error = EINVAL; 755 goto bail; 756 } 757 758again: 759 /* 760 * Let the dispatch run unlocked, then, interlock against the 761 * callback before checking if the operation completed and going 762 * to sleep. This insures drivers don't inherit our lock which 763 * results in a lock order reversal between crypto_dispatch forced 764 * entry and the crypto_done callback into us. 765 */ 766 error = crypto_dispatch(crp); 767 mtx_lock(&cse->lock); 768 if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0) 769 error = msleep(crp, &cse->lock, PWAIT, "crydev", 0); 770 mtx_unlock(&cse->lock); 771 772 if (error != 0) 773 goto bail; 774 775 if (crp->crp_etype == EAGAIN) { 776 crp->crp_etype = 0; 777 crp->crp_flags &= ~CRYPTO_F_DONE; 778 goto again; 779 } 780 781 if (crp->crp_etype != 0) { 782 error = crp->crp_etype; 783 goto bail; 784 } 785 786 if (cse->error) { 787 error = cse->error; 788 goto bail; 789 } 790 791 if (cop->dst && 792 (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len))) 793 goto bail; 794 795 if (cop->mac && 796 (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len, 797 cop->mac, cse->thash->hashsize))) 798 goto bail; 799 800bail: 801 if (crp) 802 crypto_freereq(crp); 803 if (cse->uio.uio_iov[0].iov_base) 804 free(cse->uio.uio_iov[0].iov_base, M_XDATA); 805 806 return (error); 807} 808 809static int 810cryptodev_cb(void *op) 811{ 812 struct cryptop *crp = (struct cryptop *) op; 813 struct csession *cse = (struct csession *)crp->crp_opaque; 814 815 mtx_lock(&cse->lock); 816 cse->error = crp->crp_etype; 817 wakeup_one(crp); 818 mtx_unlock(&cse->lock); 819 return (0); 820} 821 822static int 823cryptodevkey_cb(void *op) 824{ 825 struct cryptkop *krp = (struct cryptkop *) op; 826 827 wakeup_one(krp); 828 return (0); 829} 830 831static int 832cryptodev_key(struct crypt_kop *kop) 833{ 834 struct cryptkop *krp = NULL; 835 int error = EINVAL; 836 int in, out, size, i; 837 838 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) { 839 return (EFBIG); 840 } 841 842 in = kop->crk_iparams; 843 out = kop->crk_oparams; 844 switch (kop->crk_op) { 845 case CRK_MOD_EXP: 846 if (in == 3 && out == 1) 847 break; 848 return (EINVAL); 849 case CRK_MOD_EXP_CRT: 850 if (in == 6 && out == 1) 851 break; 852 return (EINVAL); 853 case CRK_DSA_SIGN: 854 if (in == 5 && out == 2) 855 break; 856 return (EINVAL); 857 case CRK_DSA_VERIFY: 858 if (in == 7 && out == 0) 859 break; 860 return (EINVAL); 861 case CRK_DH_COMPUTE_KEY: 862 if (in == 3 && out == 1) 863 break; 864 return (EINVAL); 865 default: 866 return (EINVAL); 867 } 868 869 krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK|M_ZERO); 870 if (!krp) 871 return (ENOMEM); 872 krp->krp_op = kop->crk_op; 873 krp->krp_status = kop->crk_status; 874 krp->krp_iparams = kop->crk_iparams; 875 krp->krp_oparams = kop->crk_oparams; 876 krp->krp_crid = kop->crk_crid; 877 krp->krp_status = 0; 878 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb; 879 880 for (i = 0; i < CRK_MAXPARAM; i++) { 881 if (kop->crk_param[i].crp_nbits > 65536) 882 /* Limit is the same as in OpenBSD */ 883 goto fail; 884 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits; 885 } 886 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) { 887 size = (krp->krp_param[i].crp_nbits + 7) / 8; 888 if (size == 0) 889 continue; 890 krp->krp_param[i].crp_p = malloc(size, M_XDATA, M_WAITOK); 891 if (i >= krp->krp_iparams) 892 continue; 893 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size); 894 if (error) 895 goto fail; 896 } 897 898 error = crypto_kdispatch(krp); 899 if (error) 900 goto fail; 901 error = tsleep(krp, PSOCK, "crydev", 0); 902 if (error) { 903 /* XXX can this happen? if so, how do we recover? */ 904 goto fail; 905 } 906 907 kop->crk_crid = krp->krp_crid; /* device that did the work */ 908 if (krp->krp_status != 0) { 909 error = krp->krp_status; 910 goto fail; 911 } 912 913 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) { 914 size = (krp->krp_param[i].crp_nbits + 7) / 8; 915 if (size == 0) 916 continue; 917 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size); 918 if (error) 919 goto fail; 920 } 921 922fail: 923 if (krp) { 924 kop->crk_status = krp->krp_status; 925 for (i = 0; i < CRK_MAXPARAM; i++) { 926 if (krp->krp_param[i].crp_p) 927 free(krp->krp_param[i].crp_p, M_XDATA); 928 } 929 free(krp, M_XDATA); 930 } 931 return (error); 932} 933 934static int 935cryptodev_find(struct crypt_find_op *find) 936{ 937 device_t dev; 938 939 if (find->crid != -1) { 940 dev = crypto_find_device_byhid(find->crid); 941 if (dev == NULL) 942 return (ENOENT); 943 strlcpy(find->name, device_get_nameunit(dev), 944 sizeof(find->name)); 945 } else { 946 find->crid = crypto_find_driver(find->name); 947 if (find->crid == -1) 948 return (ENOENT); 949 } 950 return (0); 951} 952 953/* ARGSUSED */ 954static int 955cryptof_poll( 956 struct file *fp, 957 int events, 958 struct ucred *active_cred, 959 struct thread *td) 960{ 961 962 return (0); 963} 964 965/* ARGSUSED */ 966static int 967cryptof_kqfilter(struct file *fp, struct knote *kn) 968{ 969 970 return (0); 971} 972 973/* ARGSUSED */ 974static int 975cryptof_stat( 976 struct file *fp, 977 struct stat *sb, 978 struct ucred *active_cred, 979 struct thread *td) 980{ 981 982 return (EOPNOTSUPP); 983} 984 985/* ARGSUSED */ 986static int 987cryptof_close(struct file *fp, struct thread *td) 988{ 989 struct fcrypt *fcr = fp->f_data; 990 struct csession *cse; 991 992 while ((cse = TAILQ_FIRST(&fcr->csessions))) { 993 TAILQ_REMOVE(&fcr->csessions, cse, next); 994 (void)csefree(cse); 995 } 996 free(fcr, M_XDATA); 997 fp->f_data = NULL; 998 return 0; 999} 1000 1001static struct csession * 1002csefind(struct fcrypt *fcr, u_int ses) 1003{ 1004 struct csession *cse; 1005 1006 TAILQ_FOREACH(cse, &fcr->csessions, next) 1007 if (cse->ses == ses) 1008 return (cse); 1009 return (NULL); 1010} 1011 1012static int 1013csedelete(struct fcrypt *fcr, struct csession *cse_del) 1014{ 1015 struct csession *cse; 1016 1017 TAILQ_FOREACH(cse, &fcr->csessions, next) { 1018 if (cse == cse_del) { 1019 TAILQ_REMOVE(&fcr->csessions, cse, next); 1020 return (1); 1021 } 1022 } 1023 return (0); 1024} 1025 1026static struct csession * 1027cseadd(struct fcrypt *fcr, struct csession *cse) 1028{ 1029 TAILQ_INSERT_TAIL(&fcr->csessions, cse, next); 1030 cse->ses = fcr->sesn++; 1031 return (cse); 1032} 1033 1034struct csession * 1035csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen, 1036 caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac, 1037 struct enc_xform *txform, struct auth_hash *thash) 1038{ 1039 struct csession *cse; 1040 1041#ifdef INVARIANTS 1042 /* NB: required when mtx_init is built with INVARIANTS */ 1043 cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT | M_ZERO); 1044#else 1045 cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT); 1046#endif 1047 if (cse == NULL) 1048 return NULL; 1049 mtx_init(&cse->lock, "cryptodev", "crypto session lock", MTX_DEF); 1050 cse->key = key; 1051 cse->keylen = keylen/8; 1052 cse->mackey = mackey; 1053 cse->mackeylen = mackeylen/8; 1054 cse->sid = sid; 1055 cse->cipher = cipher; 1056 cse->mac = mac; 1057 cse->txform = txform; 1058 cse->thash = thash; 1059 cseadd(fcr, cse); 1060 return (cse); 1061} 1062 1063static int 1064csefree(struct csession *cse) 1065{ 1066 int error; 1067 1068 error = crypto_freesession(cse->sid); 1069 mtx_destroy(&cse->lock); 1070 if (cse->key) 1071 free(cse->key, M_XDATA); 1072 if (cse->mackey) 1073 free(cse->mackey, M_XDATA); 1074 free(cse, M_XDATA); 1075 return (error); 1076} 1077 1078static int 1079cryptoopen(struct cdev *dev, int oflags, int devtype, struct thread *td) 1080{ 1081 return (0); 1082} 1083 1084static int 1085cryptoread(struct cdev *dev, struct uio *uio, int ioflag) 1086{ 1087 return (EIO); 1088} 1089 1090static int 1091cryptowrite(struct cdev *dev, struct uio *uio, int ioflag) 1092{ 1093 return (EIO); 1094} 1095 1096static int 1097cryptoioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 1098{ 1099 struct file *f; 1100 struct fcrypt *fcr; 1101 int fd, error; 1102 1103 switch (cmd) { 1104 case CRIOGET: 1105 fcr = malloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK); 1106 TAILQ_INIT(&fcr->csessions); 1107 fcr->sesn = 0; 1108 1109 error = falloc(td, &f, &fd); 1110 1111 if (error) { 1112 free(fcr, M_XDATA); 1113 return (error); 1114 } 1115 /* falloc automatically provides an extra reference to 'f'. */ 1116 finit(f, FREAD | FWRITE, DTYPE_CRYPTO, fcr, &cryptofops); 1117 *(u_int32_t *)data = fd; 1118 fdrop(f, td); 1119 break; 1120 case CRIOFINDDEV: 1121 error = cryptodev_find((struct crypt_find_op *)data); 1122 break; 1123 case CRIOASYMFEAT: 1124 error = crypto_getfeat((int *)data); 1125 break; 1126 default: 1127 error = EINVAL; 1128 break; 1129 } 1130 return (error); 1131} 1132 1133static struct cdevsw crypto_cdevsw = { 1134 .d_version = D_VERSION, 1135 .d_flags = D_NEEDGIANT, 1136 .d_open = cryptoopen, 1137 .d_read = cryptoread, 1138 .d_write = cryptowrite, 1139 .d_ioctl = cryptoioctl, 1140 .d_name = "crypto", 1141}; 1142static struct cdev *crypto_dev; 1143 1144/* 1145 * Initialization code, both for static and dynamic loading. 1146 */ 1147static int 1148cryptodev_modevent(module_t mod, int type, void *unused) 1149{ 1150 switch (type) { 1151 case MOD_LOAD: 1152 if (bootverbose) 1153 printf("crypto: <crypto device>\n"); 1154 crypto_dev = make_dev(&crypto_cdevsw, 0, 1155 UID_ROOT, GID_WHEEL, 0666, 1156 "crypto"); 1157 return 0; 1158 case MOD_UNLOAD: 1159 /*XXX disallow if active sessions */ 1160 destroy_dev(crypto_dev); 1161 return 0; 1162 } 1163 return EINVAL; 1164} 1165 1166static moduledata_t cryptodev_mod = { 1167 "cryptodev", 1168 cryptodev_modevent, 1169 0 1170}; 1171MODULE_VERSION(cryptodev, 1); 1172DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1173MODULE_DEPEND(cryptodev, crypto, 1, 1, 1); 1174MODULE_DEPEND(cryptodev, zlib, 1, 1, 1); 1175