1 /* $FreeBSD: src/sys/opencrypto/cryptodev.c,v 1.41 2009/09/04 09:48:18 pjd Exp $ */ 2 /* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */ 3 4 /*- 5 * Copyright (c) 2001 Theo de Raadt 6 * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Effort sponsored in part by the Defense Advanced Research Projects 32 * Agency (DARPA) and Air Force Research Laboratory, Air Force 33 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/device.h> 40 #include <sys/mbuf.h> 41 #include <sys/lock.h> 42 #include <sys/sysctl.h> 43 #include <sys/file.h> 44 #include <sys/filedesc.h> 45 #include <sys/errno.h> 46 #include <sys/uio.h> 47 #include <sys/random.h> 48 #include <sys/conf.h> 49 #include <sys/module.h> 50 #include <sys/kernel.h> 51 #include <sys/fcntl.h> 52 #include <sys/proc.h> 53 54 #include <sys/file2.h> 55 #include <sys/thread2.h> 56 57 #include <opencrypto/cryptodev.h> 58 #include <opencrypto/xform.h> 59 60 struct csession { 61 TAILQ_ENTRY(csession) next; 62 u_int64_t sid; 63 u_int32_t ses; 64 struct lock lock; 65 66 u_int32_t cipher; 67 struct enc_xform *txform; 68 u_int32_t mac; 69 struct auth_hash *thash; 70 71 caddr_t key; 72 int keylen; 73 u_char tmp_iv[EALG_MAX_BLOCK_LEN]; 74 75 caddr_t mackey; 76 int mackeylen; 77 78 struct iovec iovec; 79 struct uio uio; 80 int error; 81 uint32_t busy; 82 }; 83 84 struct fcrypt { 85 TAILQ_HEAD(csessionlist, csession) csessions; 86 int sesn; 87 }; 88 89 static int cryptof_rw(struct file *fp, struct uio *uio, 90 struct ucred *cred, int flags); 91 static int cryptof_ioctl(struct file *, u_long, caddr_t, 92 struct ucred *, struct sysmsg *); 93 static int cryptof_kqfilter(struct file *, struct knote *); 94 static int cryptof_stat(struct file *, struct stat *, struct ucred *); 95 static int cryptof_close(struct file *); 96 97 static struct fileops cryptofops = { 98 .fo_read = cryptof_rw, 99 .fo_write = cryptof_rw, 100 .fo_ioctl = cryptof_ioctl, 101 .fo_kqfilter = cryptof_kqfilter, 102 .fo_stat = cryptof_stat, 103 .fo_close = cryptof_close, 104 .fo_shutdown = nofo_shutdown 105 }; 106 107 static struct csession *csefind(struct fcrypt *, u_int, int *); 108 static void csedrop(struct csession *); 109 static int csedelete(struct fcrypt *, struct csession *); 110 static struct csession *cseadd(struct fcrypt *, struct csession *); 111 static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t, 112 u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *, 113 struct auth_hash *); 114 static int csefree(struct csession *); 115 116 static int cryptodev_op(struct csession *, struct crypt_op *, struct ucred *); 117 static int cryptodev_key(struct crypt_kop *); 118 static int cryptodev_find(struct crypt_find_op *); 119 120 static struct lock cryptodev_lock = LOCK_INITIALIZER("cryptodev", 0, 0); 121 122 static int 123 cryptof_rw( 124 struct file *fp, 125 struct uio *uio, 126 struct ucred *active_cred, 127 int flags) 128 { 129 return (EIO); 130 } 131 132 /* 133 * Check a crypto identifier to see if it requested 134 * a software device/driver. This can be done either 135 * by device name/class or through search constraints. 136 */ 137 static int 138 checkforsoftware(int crid) 139 { 140 if (crid & CRYPTOCAP_F_SOFTWARE) 141 return EINVAL; /* XXX */ 142 if ((crid & CRYPTOCAP_F_HARDWARE) == 0 && 143 (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0) 144 return EINVAL; /* XXX */ 145 return 0; 146 } 147 148 /* ARGSUSED */ 149 static int 150 cryptof_ioctl(struct file *fp, u_long cmd, caddr_t data, 151 struct ucred *cred, struct sysmsg *msg) 152 { 153 #define SES2(p) ((struct session2_op *)p) 154 struct cryptoini cria, crie; 155 struct fcrypt *fcr = fp->f_data; 156 struct csession *cse; 157 struct session_op *sop; 158 struct crypt_op *cop; 159 struct enc_xform *txform = NULL; 160 struct auth_hash *thash = NULL; 161 struct crypt_kop *kop; 162 u_int64_t sid; 163 u_int32_t ses; 164 int error = 0, crid; 165 166 switch (cmd) { 167 case CIOCGSESSION: 168 case CIOCGSESSION2: 169 sop = (struct session_op *)data; 170 switch (sop->cipher) { 171 case 0: 172 break; 173 case CRYPTO_DES_CBC: 174 txform = &enc_xform_des; 175 break; 176 case CRYPTO_3DES_CBC: 177 txform = &enc_xform_3des; 178 break; 179 case CRYPTO_BLF_CBC: 180 txform = &enc_xform_blf; 181 break; 182 case CRYPTO_CAST_CBC: 183 txform = &enc_xform_cast5; 184 break; 185 case CRYPTO_SKIPJACK_CBC: 186 txform = &enc_xform_skipjack; 187 break; 188 case CRYPTO_AES_CBC: 189 txform = &enc_xform_rijndael128; 190 break; 191 case CRYPTO_AES_XTS: 192 txform = &enc_xform_aes_xts; 193 break; 194 case CRYPTO_AES_CTR: 195 txform = &enc_xform_aes_ctr; 196 break; 197 case CRYPTO_NULL_CBC: 198 txform = &enc_xform_null; 199 break; 200 case CRYPTO_ARC4: 201 txform = &enc_xform_arc4; 202 break; 203 case CRYPTO_CAMELLIA_CBC: 204 txform = &enc_xform_camellia; 205 break; 206 case CRYPTO_TWOFISH_CBC: 207 txform = &enc_xform_twofish; 208 break; 209 case CRYPTO_SERPENT_CBC: 210 txform = &enc_xform_serpent; 211 break; 212 case CRYPTO_TWOFISH_XTS: 213 txform = &enc_xform_twofish_xts; 214 break; 215 case CRYPTO_SERPENT_XTS: 216 txform = &enc_xform_serpent_xts; 217 break; 218 default: 219 return (EINVAL); 220 } 221 222 switch (sop->mac) { 223 case 0: 224 break; 225 case CRYPTO_MD5_HMAC: 226 thash = &auth_hash_hmac_md5; 227 break; 228 case CRYPTO_SHA1_HMAC: 229 thash = &auth_hash_hmac_sha1; 230 break; 231 case CRYPTO_SHA2_256_HMAC: 232 thash = &auth_hash_hmac_sha2_256; 233 break; 234 case CRYPTO_SHA2_384_HMAC: 235 thash = &auth_hash_hmac_sha2_384; 236 break; 237 case CRYPTO_SHA2_512_HMAC: 238 thash = &auth_hash_hmac_sha2_512; 239 break; 240 case CRYPTO_RIPEMD160_HMAC: 241 thash = &auth_hash_hmac_ripemd_160; 242 break; 243 #ifdef notdef 244 case CRYPTO_MD5: 245 thash = &auth_hash_md5; 246 break; 247 case CRYPTO_SHA1: 248 thash = &auth_hash_sha1; 249 break; 250 #endif 251 case CRYPTO_NULL_HMAC: 252 thash = &auth_hash_null; 253 break; 254 default: 255 return (EINVAL); 256 } 257 258 bzero(&crie, sizeof(crie)); 259 bzero(&cria, sizeof(cria)); 260 261 if (txform) { 262 crie.cri_alg = txform->type; 263 crie.cri_klen = sop->keylen * 8; 264 if (sop->keylen > txform->maxkey || 265 sop->keylen < txform->minkey) { 266 error = EINVAL; 267 goto bail; 268 } 269 270 crie.cri_key = kmalloc(crie.cri_klen / 8, 271 M_XDATA, M_WAITOK); 272 if ((error = copyin(sop->key, crie.cri_key, 273 crie.cri_klen / 8))) 274 goto bail; 275 if (thash) 276 crie.cri_next = &cria; 277 } 278 279 if (thash) { 280 cria.cri_alg = thash->type; 281 cria.cri_klen = sop->mackeylen * 8; 282 if (sop->mackeylen != thash->keysize) { 283 error = EINVAL; 284 goto bail; 285 } 286 287 if (cria.cri_klen) { 288 cria.cri_key = kmalloc(cria.cri_klen / 8, 289 M_XDATA, M_WAITOK); 290 if ((error = copyin(sop->mackey, cria.cri_key, 291 cria.cri_klen / 8))) 292 goto bail; 293 } 294 } 295 296 /* NB: CIOGSESSION2 has the crid */ 297 if (cmd == CIOCGSESSION2) { 298 crid = SES2(sop)->crid; 299 error = checkforsoftware(crid); 300 if (error) 301 goto bail; 302 } else { 303 crid = CRYPTOCAP_F_HARDWARE; 304 if (crypto_devallowsoft) 305 crid |= CRYPTOCAP_F_SOFTWARE; 306 } 307 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid); 308 if (error) 309 goto bail; 310 311 lockmgr(&cryptodev_lock, LK_EXCLUSIVE); 312 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen, 313 cria.cri_key, cria.cri_klen, sop->cipher, 314 sop->mac, txform, thash); 315 lockmgr(&cryptodev_lock, LK_RELEASE); 316 317 if (cse == NULL) { 318 crypto_freesession(sid); 319 error = EINVAL; 320 goto bail; 321 } 322 sop->ses = cse->ses; 323 if (cmd == CIOCGSESSION2) { 324 /* return hardware/driver id */ 325 SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid); 326 } 327 bail: 328 if (error) { 329 if (crie.cri_key) { 330 bzero(crie.cri_key, crie.cri_klen / 8); 331 kfree(crie.cri_key, M_XDATA); 332 } 333 if (cria.cri_key) { 334 bzero(cria.cri_key, cria.cri_klen / 8); 335 kfree(cria.cri_key, M_XDATA); 336 } 337 } 338 break; 339 case CIOCFSESSION: 340 lockmgr(&cryptodev_lock, LK_EXCLUSIVE); 341 ses = *(u_int32_t *)data; 342 cse = csefind(fcr, ses, &error); 343 if (cse) { 344 csedelete(fcr, cse); 345 error = csefree(cse); 346 } 347 lockmgr(&cryptodev_lock, LK_RELEASE); 348 break; 349 case CIOCCRYPT: 350 cop = (struct crypt_op *)data; 351 lockmgr(&cryptodev_lock, LK_EXCLUSIVE); 352 cse = csefind(fcr, cop->ses, &error); 353 lockmgr(&cryptodev_lock, LK_RELEASE); 354 if (cse) { 355 error = cryptodev_op(cse, cop, cred); 356 csedrop(cse); 357 } 358 break; 359 case CIOCKEY: 360 case CIOCKEY2: 361 if (!crypto_userasymcrypto) 362 return (EPERM); /* XXX compat? */ 363 lockmgr(&cryptodev_lock, LK_EXCLUSIVE); 364 kop = (struct crypt_kop *)data; 365 if (cmd == CIOCKEY) { 366 /* NB: crypto core enforces s/w driver use */ 367 kop->crk_crid = 368 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 369 } 370 error = cryptodev_key(kop); 371 lockmgr(&cryptodev_lock, LK_RELEASE); 372 break; 373 case CIOCASYMFEAT: 374 if (!crypto_userasymcrypto) { 375 /* 376 * NB: if user asym crypto operations are 377 * not permitted return "no algorithms" 378 * so well-behaved applications will just 379 * fallback to doing them in software. 380 */ 381 *(int *)data = 0; 382 } else { 383 error = crypto_getfeat((int *)data); 384 } 385 break; 386 case CIOCFINDDEV: 387 error = cryptodev_find((struct crypt_find_op *)data); 388 break; 389 default: 390 error = EINVAL; 391 break; 392 } 393 return (error); 394 #undef SES2 395 } 396 397 static int cryptodev_cb(void *); 398 399 static int 400 cryptodev_op(struct csession *cse, struct crypt_op *cop, 401 struct ucred *active_cred) 402 { 403 struct cryptop *crp = NULL; 404 struct cryptodesc *crde = NULL, *crda = NULL; 405 int error; 406 407 if (cop->len > 256*1024-4) 408 return (E2BIG); 409 410 if (cse->txform) { 411 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0) 412 return (EINVAL); 413 } 414 415 bzero(&cse->uio, sizeof(cse->uio)); 416 cse->uio.uio_iov = &cse->iovec; 417 cse->uio.uio_iovcnt = 1; 418 cse->uio.uio_offset = 0; 419 cse->uio.uio_resid = cop->len; 420 cse->uio.uio_segflg = UIO_SYSSPACE; 421 cse->uio.uio_rw = UIO_WRITE; 422 /* XXX: not sure, was td, now curthread? */ 423 cse->uio.uio_td = curthread; 424 cse->uio.uio_iov[0].iov_len = cop->len; 425 if (cse->thash) { 426 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize; 427 cse->uio.uio_resid += cse->thash->hashsize; 428 } 429 cse->uio.uio_iov[0].iov_base = kmalloc(cse->uio.uio_iov[0].iov_len, 430 M_XDATA, M_WAITOK); 431 432 crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL)); 433 if (crp == NULL) { 434 error = ENOMEM; 435 goto bail; 436 } 437 438 if (cse->thash) { 439 crda = crp->crp_desc; 440 if (cse->txform) 441 crde = crda->crd_next; 442 } else { 443 if (cse->txform) 444 crde = crp->crp_desc; 445 else { 446 error = EINVAL; 447 goto bail; 448 } 449 } 450 451 if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len))) 452 goto bail; 453 454 if (crda) { 455 crda->crd_skip = 0; 456 crda->crd_len = cop->len; 457 crda->crd_inject = cop->len; 458 459 crda->crd_alg = cse->mac; 460 crda->crd_key = cse->mackey; 461 crda->crd_klen = cse->mackeylen * 8; 462 } 463 464 if (crde) { 465 if (cop->op == COP_ENCRYPT) 466 crde->crd_flags |= CRD_F_ENCRYPT; 467 else 468 crde->crd_flags &= ~CRD_F_ENCRYPT; 469 crde->crd_len = cop->len; 470 crde->crd_inject = 0; 471 472 crde->crd_alg = cse->cipher; 473 crde->crd_key = cse->key; 474 crde->crd_klen = cse->keylen * 8; 475 } 476 477 crp->crp_ilen = cop->len; 478 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM 479 | (cop->flags & COP_F_BATCH); 480 crp->crp_buf = (caddr_t)&cse->uio; 481 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb; 482 crp->crp_sid = cse->sid; 483 crp->crp_opaque = (void *)cse; 484 485 if (cop->iv) { 486 if (crde == NULL) { 487 error = EINVAL; 488 goto bail; 489 } 490 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 491 error = EINVAL; 492 goto bail; 493 } 494 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize))) 495 goto bail; 496 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize); 497 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 498 crde->crd_skip = 0; 499 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ 500 crde->crd_skip = 0; 501 } else if (crde) { 502 crde->crd_flags |= CRD_F_IV_PRESENT; 503 crde->crd_skip = cse->txform->blocksize; 504 crde->crd_len -= cse->txform->blocksize; 505 } 506 507 if (cop->mac && crda == NULL) { 508 error = EINVAL; 509 goto bail; 510 } 511 512 again: 513 /* 514 * Let the dispatch run unlocked, then, interlock against the 515 * callback before checking if the operation completed and going 516 * to sleep. This insures drivers don't inherit our lock which 517 * results in a lock order reversal between crypto_dispatch forced 518 * entry and the crypto_done callback into us. 519 */ 520 error = crypto_dispatch(crp); 521 lockmgr(&cse->lock, LK_EXCLUSIVE); 522 if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0) 523 error = lksleep(crp, &cse->lock, 0, "crydev", 0); 524 lockmgr(&cse->lock, LK_RELEASE); 525 526 if (error != 0) 527 goto bail; 528 529 if (crp->crp_etype == EAGAIN) { 530 crp->crp_etype = 0; 531 crp->crp_flags &= ~CRYPTO_F_DONE; 532 goto again; 533 } 534 535 if (crp->crp_etype != 0) { 536 error = crp->crp_etype; 537 goto bail; 538 } 539 540 if (cse->error) { 541 error = cse->error; 542 goto bail; 543 } 544 545 if (cop->dst && 546 (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len))) 547 goto bail; 548 549 if (cop->mac && 550 (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len, 551 cop->mac, cse->thash->hashsize))) 552 goto bail; 553 554 bail: 555 if (crp) 556 crypto_freereq(crp); 557 if (cse->uio.uio_iov[0].iov_base) 558 kfree(cse->uio.uio_iov[0].iov_base, M_XDATA); 559 560 return (error); 561 } 562 563 static int 564 cryptodev_cb(void *op) 565 { 566 struct cryptop *crp = (struct cryptop *) op; 567 struct csession *cse = (struct csession *)crp->crp_opaque; 568 569 lockmgr(&cse->lock, LK_EXCLUSIVE); 570 cse->error = crp->crp_etype; 571 wakeup_one(crp); 572 lockmgr(&cse->lock, LK_RELEASE); 573 return (0); 574 } 575 576 static int 577 cryptodevkey_cb(void *op) 578 { 579 struct cryptkop *krp = (struct cryptkop *) op; 580 581 wakeup_one(krp); 582 return (0); 583 } 584 585 static int 586 cryptodev_key(struct crypt_kop *kop) 587 { 588 struct cryptkop *krp = NULL; 589 int error = EINVAL; 590 int in, out, size, i; 591 592 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) { 593 return (EFBIG); 594 } 595 596 in = kop->crk_iparams; 597 out = kop->crk_oparams; 598 switch (kop->crk_op) { 599 case CRK_MOD_EXP: 600 if (in == 3 && out == 1) 601 break; 602 return (EINVAL); 603 case CRK_MOD_EXP_CRT: 604 if (in == 6 && out == 1) 605 break; 606 return (EINVAL); 607 case CRK_DSA_SIGN: 608 if (in == 5 && out == 2) 609 break; 610 return (EINVAL); 611 case CRK_DSA_VERIFY: 612 if (in == 7 && out == 0) 613 break; 614 return (EINVAL); 615 case CRK_DH_COMPUTE_KEY: 616 if (in == 3 && out == 1) 617 break; 618 return (EINVAL); 619 default: 620 return (EINVAL); 621 } 622 623 krp = (struct cryptkop *)kmalloc(sizeof *krp, M_XDATA, M_WAITOK | M_ZERO); 624 krp->krp_op = kop->crk_op; 625 krp->krp_status = kop->crk_status; 626 krp->krp_iparams = kop->crk_iparams; 627 krp->krp_oparams = kop->crk_oparams; 628 krp->krp_crid = kop->crk_crid; 629 krp->krp_status = 0; 630 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb; 631 632 for (i = 0; i < CRK_MAXPARAM; i++) { 633 if (kop->crk_param[i].crp_nbits > 65536) 634 /* Limit is the same as in OpenBSD */ 635 goto fail; 636 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits; 637 } 638 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) { 639 size = (krp->krp_param[i].crp_nbits + 7) / 8; 640 if (size == 0) 641 continue; 642 krp->krp_param[i].crp_p = kmalloc(size, M_XDATA, M_WAITOK); 643 if (i >= krp->krp_iparams) 644 continue; 645 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size); 646 if (error) 647 goto fail; 648 } 649 650 error = crypto_kdispatch(krp); 651 if (error) 652 goto fail; 653 error = tsleep(krp, 0, "crydev", 0); 654 if (error) { 655 /* XXX can this happen? if so, how do we recover? */ 656 goto fail; 657 } 658 659 kop->crk_crid = krp->krp_crid; /* device that did the work */ 660 if (krp->krp_status != 0) { 661 error = krp->krp_status; 662 goto fail; 663 } 664 665 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) { 666 size = (krp->krp_param[i].crp_nbits + 7) / 8; 667 if (size == 0) 668 continue; 669 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size); 670 if (error) 671 goto fail; 672 } 673 674 fail: 675 if (krp) { 676 kop->crk_status = krp->krp_status; 677 for (i = 0; i < CRK_MAXPARAM; i++) { 678 if (krp->krp_param[i].crp_p) { 679 bzero(krp->krp_param[i].crp_p, 680 (krp->krp_param[i].crp_nbits + 7) / 8); 681 kfree(krp->krp_param[i].crp_p, M_XDATA); 682 } 683 } 684 kfree(krp, M_XDATA); 685 } 686 return (error); 687 } 688 689 static int 690 cryptodev_find(struct crypt_find_op *find) 691 { 692 device_t dev; 693 694 if (find->crid != -1) { 695 dev = crypto_find_device_byhid(find->crid); 696 if (dev == NULL) 697 return (ENOENT); 698 strlcpy(find->name, device_get_nameunit(dev), 699 sizeof(find->name)); 700 } else { 701 find->crid = crypto_find_driver(find->name); 702 if (find->crid == -1) 703 return (ENOENT); 704 } 705 return (0); 706 } 707 708 /* 709 * MPSAFE 710 */ 711 static int 712 cryptof_kqfilter(struct file *fp, struct knote *kn) 713 { 714 715 return (0); 716 } 717 718 /* 719 * MPSAFE 720 */ 721 static int 722 cryptof_stat(struct file *fp, struct stat *sb, struct ucred *cred) 723 { 724 return (EOPNOTSUPP); 725 } 726 727 static int 728 cryptof_close(struct file *fp) 729 { 730 struct fcrypt *fcr = fp->f_data; 731 struct csession *cse; 732 733 lockmgr(&cryptodev_lock, LK_EXCLUSIVE); 734 fcr = (struct fcrypt *)fp->f_data; 735 while ((cse = TAILQ_FIRST(&fcr->csessions))) { 736 TAILQ_REMOVE(&fcr->csessions, cse, next); 737 (void)csefree(cse); 738 } 739 fp->f_data = NULL; 740 lockmgr(&cryptodev_lock, LK_RELEASE); 741 742 kfree(fcr, M_XDATA); 743 return (0); 744 } 745 746 static struct csession * 747 csefind(struct fcrypt *fcr, u_int ses, int *errorp) 748 { 749 struct csession *cse; 750 751 TAILQ_FOREACH(cse, &fcr->csessions, next) { 752 if (cse->ses == ses) { 753 if (cse->busy) { 754 kprintf("csefind: cse %p BUSY\n", cse); 755 *errorp = EBUSY; 756 return NULL; 757 } 758 cse->busy = 1; 759 return (cse); 760 } 761 } 762 *errorp = EINVAL; 763 return (NULL); 764 } 765 766 static void 767 csedrop(struct csession *cse) 768 { 769 cse->busy = 0; 770 } 771 772 static int 773 csedelete(struct fcrypt *fcr, struct csession *cse_del) 774 { 775 struct csession *cse; 776 777 TAILQ_FOREACH(cse, &fcr->csessions, next) { 778 if (cse == cse_del) { 779 TAILQ_REMOVE(&fcr->csessions, cse, next); 780 return (1); 781 } 782 } 783 return (0); 784 } 785 786 static struct csession * 787 cseadd(struct fcrypt *fcr, struct csession *cse) 788 { 789 TAILQ_INSERT_TAIL(&fcr->csessions, cse, next); 790 cse->ses = fcr->sesn++; 791 return (cse); 792 } 793 794 struct csession * 795 csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen, 796 caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac, 797 struct enc_xform *txform, struct auth_hash *thash) 798 { 799 struct csession *cse; 800 801 cse = kmalloc(sizeof(struct csession), M_XDATA, M_WAITOK | M_ZERO); 802 lockinit(&cse->lock, "cryptodev", 0, LK_CANRECURSE); 803 cse->key = key; 804 cse->keylen = keylen/8; 805 cse->mackey = mackey; 806 cse->mackeylen = mackeylen/8; 807 cse->sid = sid; 808 cse->cipher = cipher; 809 cse->mac = mac; 810 cse->txform = txform; 811 cse->thash = thash; 812 cseadd(fcr, cse); 813 return (cse); 814 } 815 816 static int 817 csefree(struct csession *cse) 818 { 819 int error; 820 821 error = crypto_freesession(cse->sid); 822 lockuninit(&cse->lock); 823 if (cse->key) 824 kfree(cse->key, M_XDATA); 825 if (cse->mackey) 826 kfree(cse->mackey, M_XDATA); 827 kfree(cse, M_XDATA); 828 return (error); 829 } 830 831 static int 832 cryptoopen(struct dev_open_args *ap) 833 { 834 return (0); 835 } 836 837 static int 838 cryptoread(struct dev_read_args *ap) 839 { 840 return (EIO); 841 } 842 843 static int 844 cryptowrite(struct dev_write_args *ap) 845 { 846 return (EIO); 847 } 848 849 static int 850 cryptoioctl(struct dev_ioctl_args *ap) 851 { 852 struct thread *td = curthread; 853 struct file *f; 854 struct fcrypt *fcr; 855 int fd, error; 856 857 switch (ap->a_cmd) { 858 case CRIOGET: 859 fcr = kmalloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK); 860 TAILQ_INIT(&fcr->csessions); 861 fcr->sesn = 0; 862 863 KKASSERT(td->td_lwp); 864 error = falloc(td->td_lwp, &f, &fd); 865 866 if (error) { 867 kfree(fcr, M_XDATA); 868 return (error); 869 } 870 /* falloc automatically provides an extra reference to 'f'. */ 871 f->f_flag = FREAD | FWRITE; 872 f->f_type = DTYPE_CRYPTO; 873 f->f_ops = &cryptofops; 874 f->f_data = fcr; 875 fsetfd(td->td_proc->p_fd, f, fd); 876 *(u_int32_t *)ap->a_data = fd; 877 fdrop(f); 878 879 break; 880 case CRIOFINDDEV: 881 error = cryptodev_find((struct crypt_find_op *)ap->a_data); 882 break; 883 case CRIOASYMFEAT: 884 error = crypto_getfeat((int *)ap->a_data); 885 break; 886 default: 887 error = EINVAL; 888 break; 889 } 890 return (error); 891 } 892 893 static struct dev_ops crypto_ops = { 894 { "crypto", 0, D_MPSAFE }, 895 .d_open = cryptoopen, 896 .d_read = cryptoread, 897 .d_write = cryptowrite, 898 .d_ioctl = cryptoioctl, 899 }; 900 901 /* 902 * Initialization code, both for static and dynamic loading. 903 */ 904 static int 905 cryptodev_modevent(module_t mod, int type, void *unused) 906 { 907 switch (type) { 908 case MOD_LOAD: 909 if (bootverbose) 910 kprintf("crypto: <crypto device>\n"); 911 make_dev(&crypto_ops, 0, UID_ROOT, GID_WHEEL, 912 0666, "crypto"); 913 return 0; 914 case MOD_UNLOAD: 915 /*XXX disallow if active sessions */ 916 //dev_ops_remove(&crypto_ops, 0, 0); 917 dev_ops_remove_all(&crypto_ops); 918 return 0; 919 } 920 return EINVAL; 921 } 922 923 static moduledata_t cryptodev_mod = { 924 "cryptodev", 925 cryptodev_modevent, 926 0 927 }; 928 MODULE_VERSION(cryptodev, 1); 929 DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 930 MODULE_DEPEND(cryptodev, crypto, 1, 1, 1); 931