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