| 1 | /* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Linux port done by David McCullough <david_mccullough@securecomputing.com> |
| 5 | * Copyright (C) 2006-2007 David McCullough |
| 6 | * Copyright (C) 2004-2005 Intel Corporation. |
| 7 | * The license and original author are listed below. |
| 8 | * |
| 9 | * Copyright (c) 2001 Theo de Raadt |
| 10 | * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * |
| 16 | * 1. Redistributions of source code must retain the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer. |
| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer in the |
| 20 | * documentation and/or other materials provided with the distribution. |
| 21 | * 3. The name of the author may not be used to endorse or promote products |
| 22 | * derived from this software without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 34 | * |
| 35 | * Effort sponsored in part by the Defense Advanced Research Projects |
| 36 | * Agency (DARPA) and Air Force Research Laboratory, Air Force |
| 37 | * Materiel Command, USAF, under agreement number F30602-01-2-0537. |
| 38 | * |
| 39 | __FBSDID("$FreeBSD: src/sys/opencrypto/cryptodev.c,v 1.34 2007/05/09 19:37:02 gnn Exp $"); |
| 40 | */ |
| 41 | |
| 42 | #ifndef AUTOCONF_INCLUDED |
| 43 | #include <linux/config.h> |
| 44 | #endif |
| 45 | #include <linux/types.h> |
| 46 | #include <linux/time.h> |
| 47 | #include <linux/delay.h> |
| 48 | #include <linux/list.h> |
| 49 | #include <linux/init.h> |
| 50 | #include <linux/sched.h> |
| 51 | #include <linux/unistd.h> |
| 52 | #include <linux/module.h> |
| 53 | #include <linux/wait.h> |
| 54 | #include <linux/slab.h> |
| 55 | #include <linux/fs.h> |
| 56 | #include <linux/dcache.h> |
| 57 | #include <linux/file.h> |
| 58 | #include <linux/mount.h> |
| 59 | #include <linux/miscdevice.h> |
| 60 | #include <linux/version.h> |
| 61 | #include <asm/uaccess.h> |
| 62 | |
| 63 | #include <cryptodev.h> |
| 64 | #include <uio.h> |
| 65 | |
| 66 | extern asmlinkage long sys_dup(unsigned int fildes); |
| 67 | |
| 68 | #define debug cryptodev_debug |
| 69 | int cryptodev_debug = 0; |
| 70 | module_param(cryptodev_debug, int, 0644); |
| 71 | MODULE_PARM_DESC(cryptodev_debug, "Enable cryptodev debug"); |
| 72 | |
| 73 | struct csession_info { |
| 74 | u_int16_t blocksize; |
| 75 | u_int16_t minkey, maxkey; |
| 76 | |
| 77 | u_int16_t keysize; |
| 78 | /* u_int16_t hashsize; */ |
| 79 | u_int16_t authsize; |
| 80 | /* u_int16_t ctxsize; */ |
| 81 | }; |
| 82 | |
| 83 | struct csession { |
| 84 | struct list_head list; |
| 85 | u_int64_t sid; |
| 86 | u_int32_t ses; |
| 87 | |
| 88 | wait_queue_head_t waitq; |
| 89 | |
| 90 | u_int32_t cipher; |
| 91 | |
| 92 | u_int32_t mac; |
| 93 | |
| 94 | caddr_t key; |
| 95 | int keylen; |
| 96 | u_char tmp_iv[EALG_MAX_BLOCK_LEN]; |
| 97 | |
| 98 | caddr_t mackey; |
| 99 | int mackeylen; |
| 100 | |
| 101 | struct csession_info info; |
| 102 | |
| 103 | struct iovec iovec; |
| 104 | struct uio uio; |
| 105 | int error; |
| 106 | }; |
| 107 | |
| 108 | struct fcrypt { |
| 109 | struct list_head csessions; |
| 110 | int sesn; |
| 111 | }; |
| 112 | |
| 113 | static struct csession *csefind(struct fcrypt *, u_int); |
| 114 | static int csedelete(struct fcrypt *, struct csession *); |
| 115 | static struct csession *cseadd(struct fcrypt *, struct csession *); |
| 116 | static struct csession *csecreate(struct fcrypt *, u_int64_t, |
| 117 | struct cryptoini *crie, struct cryptoini *cria, struct csession_info *); |
| 118 | static int csefree(struct csession *); |
| 119 | |
| 120 | static int cryptodev_op(struct csession *, struct crypt_op *); |
| 121 | static int cryptodev_key(struct crypt_kop *); |
| 122 | static int cryptodev_find(struct crypt_find_op *); |
| 123 | |
| 124 | static int cryptodev_cb(void *); |
| 125 | static int cryptodev_open(struct inode *inode, struct file *filp); |
| 126 | |
| 127 | /* |
| 128 | * Check a crypto identifier to see if it requested |
| 129 | * a valid crid and it's capabilities match. |
| 130 | */ |
| 131 | static int |
| 132 | checkcrid(int crid) |
| 133 | { |
| 134 | int hid = crid & ~(CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE); |
| 135 | int typ = crid & (CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE); |
| 136 | int caps = 0; |
| 137 | |
| 138 | /* if the user hasn't selected a driver, then just call newsession */ |
| 139 | if (hid == 0 && typ != 0) |
| 140 | return 0; |
| 141 | |
| 142 | caps = crypto_getcaps(hid); |
| 143 | |
| 144 | /* didn't find anything with capabilities */ |
| 145 | if (caps == 0) { |
| 146 | dprintk("%s: hid=%x typ=%x not matched\n", __FUNCTION__, hid, typ); |
| 147 | return EINVAL; |
| 148 | } |
| 149 | |
| 150 | /* the user didn't specify SW or HW, so the driver is ok */ |
| 151 | if (typ == 0) |
| 152 | return 0; |
| 153 | |
| 154 | /* if the type specified didn't match */ |
| 155 | if (typ != (caps & (CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_HARDWARE))) { |
| 156 | dprintk("%s: hid=%x typ=%x caps=%x not matched\n", __FUNCTION__, |
| 157 | hid, typ, caps); |
| 158 | return EINVAL; |
| 159 | } |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int |
| 165 | cryptodev_op(struct csession *cse, struct crypt_op *cop) |
| 166 | { |
| 167 | struct cryptop *crp = NULL; |
| 168 | struct cryptodesc *crde = NULL, *crda = NULL; |
| 169 | int error = 0; |
| 170 | |
| 171 | dprintk("%s()\n", __FUNCTION__); |
| 172 | if (cop->len > CRYPTO_MAX_DATA_LEN) { |
| 173 | dprintk("%s: %d > %d\n", __FUNCTION__, cop->len, CRYPTO_MAX_DATA_LEN); |
| 174 | return (E2BIG); |
| 175 | } |
| 176 | |
| 177 | if (cse->info.blocksize && (cop->len % cse->info.blocksize) != 0) { |
| 178 | dprintk("%s: blocksize=%d len=%d\n", __FUNCTION__, cse->info.blocksize, |
| 179 | cop->len); |
| 180 | return (EINVAL); |
| 181 | } |
| 182 | |
| 183 | cse->uio.uio_iov = &cse->iovec; |
| 184 | cse->uio.uio_iovcnt = 1; |
| 185 | cse->uio.uio_offset = 0; |
| 186 | #if 0 |
| 187 | cse->uio.uio_resid = cop->len; |
| 188 | cse->uio.uio_segflg = UIO_SYSSPACE; |
| 189 | cse->uio.uio_rw = UIO_WRITE; |
| 190 | cse->uio.uio_td = td; |
| 191 | #endif |
| 192 | cse->uio.uio_iov[0].iov_len = cop->len; |
| 193 | if (cse->info.authsize) |
| 194 | cse->uio.uio_iov[0].iov_len += cse->info.authsize; |
| 195 | cse->uio.uio_iov[0].iov_base = kmalloc(cse->uio.uio_iov[0].iov_len, |
| 196 | GFP_KERNEL); |
| 197 | |
| 198 | if (cse->uio.uio_iov[0].iov_base == NULL) { |
| 199 | dprintk("%s: iov_base kmalloc(%d) failed\n", __FUNCTION__, |
| 200 | cse->uio.uio_iov[0].iov_len); |
| 201 | return (ENOMEM); |
| 202 | } |
| 203 | |
| 204 | crp = crypto_getreq((cse->info.blocksize != 0) + (cse->info.authsize != 0)); |
| 205 | if (crp == NULL) { |
| 206 | dprintk("%s: ENOMEM\n", __FUNCTION__); |
| 207 | error = ENOMEM; |
| 208 | goto bail; |
| 209 | } |
| 210 | |
| 211 | if (cse->info.authsize) { |
| 212 | crda = crp->crp_desc; |
| 213 | if (cse->info.blocksize) |
| 214 | crde = crda->crd_next; |
| 215 | } else { |
| 216 | if (cse->info.blocksize) |
| 217 | crde = crp->crp_desc; |
| 218 | else { |
| 219 | dprintk("%s: bad request\n", __FUNCTION__); |
| 220 | error = EINVAL; |
| 221 | goto bail; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | if ((error = copy_from_user(cse->uio.uio_iov[0].iov_base, cop->src, |
| 226 | cop->len))) { |
| 227 | dprintk("%s: bad copy\n", __FUNCTION__); |
| 228 | goto bail; |
| 229 | } |
| 230 | |
| 231 | if (crda) { |
| 232 | crda->crd_skip = 0; |
| 233 | crda->crd_len = cop->len; |
| 234 | crda->crd_inject = cop->len; |
| 235 | |
| 236 | crda->crd_alg = cse->mac; |
| 237 | crda->crd_key = cse->mackey; |
| 238 | crda->crd_klen = cse->mackeylen * 8; |
| 239 | } |
| 240 | |
| 241 | if (crde) { |
| 242 | if (cop->op == COP_ENCRYPT) |
| 243 | crde->crd_flags |= CRD_F_ENCRYPT; |
| 244 | else |
| 245 | crde->crd_flags &= ~CRD_F_ENCRYPT; |
| 246 | crde->crd_len = cop->len; |
| 247 | crde->crd_inject = 0; |
| 248 | |
| 249 | crde->crd_alg = cse->cipher; |
| 250 | crde->crd_key = cse->key; |
| 251 | crde->crd_klen = cse->keylen * 8; |
| 252 | } |
| 253 | |
| 254 | crp->crp_ilen = cse->uio.uio_iov[0].iov_len; |
| 255 | crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM |
| 256 | | (cop->flags & COP_F_BATCH); |
| 257 | crp->crp_buf = (caddr_t)&cse->uio; |
| 258 | crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb; |
| 259 | crp->crp_sid = cse->sid; |
| 260 | crp->crp_opaque = (void *)cse; |
| 261 | |
| 262 | if (cop->iv) { |
| 263 | if (crde == NULL) { |
| 264 | error = EINVAL; |
| 265 | dprintk("%s no crde\n", __FUNCTION__); |
| 266 | goto bail; |
| 267 | } |
| 268 | if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ |
| 269 | error = EINVAL; |
| 270 | dprintk("%s arc4 with IV\n", __FUNCTION__); |
| 271 | goto bail; |
| 272 | } |
| 273 | if ((error = copy_from_user(cse->tmp_iv, cop->iv, |
| 274 | cse->info.blocksize))) { |
| 275 | dprintk("%s bad iv copy\n", __FUNCTION__); |
| 276 | goto bail; |
| 277 | } |
| 278 | memcpy(crde->crd_iv, cse->tmp_iv, cse->info.blocksize); |
| 279 | crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; |
| 280 | crde->crd_skip = 0; |
| 281 | } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */ |
| 282 | crde->crd_skip = 0; |
| 283 | } else if (crde) { |
| 284 | crde->crd_flags |= CRD_F_IV_PRESENT; |
| 285 | crde->crd_skip = cse->info.blocksize; |
| 286 | crde->crd_len -= cse->info.blocksize; |
| 287 | } |
| 288 | |
| 289 | if (cop->mac && crda == NULL) { |
| 290 | error = EINVAL; |
| 291 | dprintk("%s no crda\n", __FUNCTION__); |
| 292 | goto bail; |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Let the dispatch run unlocked, then, interlock against the |
| 297 | * callback before checking if the operation completed and going |
| 298 | * to sleep. This insures drivers don't inherit our lock which |
| 299 | * results in a lock order reversal between crypto_dispatch forced |
| 300 | * entry and the crypto_done callback into us. |
| 301 | */ |
| 302 | error = crypto_dispatch(crp); |
| 303 | if (error == 0) { |
| 304 | dprintk("%s about to WAIT\n", __FUNCTION__); |
| 305 | /* |
| 306 | * we really need to wait for driver to complete to maintain |
| 307 | * state, luckily interrupts will be remembered |
| 308 | */ |
| 309 | do { |
| 310 | error = wait_event_interruptible(crp->crp_waitq, |
| 311 | ((crp->crp_flags & CRYPTO_F_DONE) != 0)); |
| 312 | /* |
| 313 | * we can't break out of this loop or we will leave behind |
| 314 | * a huge mess, however, staying here means if your driver |
| 315 | * is broken user applications can hang and not be killed. |
| 316 | * The solution, fix your driver :-) |
| 317 | */ |
| 318 | if (error) { |
| 319 | schedule(); |
| 320 | error = 0; |
| 321 | } |
| 322 | } while ((crp->crp_flags & CRYPTO_F_DONE) == 0); |
| 323 | dprintk("%s finished WAITING error=%d\n", __FUNCTION__, error); |
| 324 | } |
| 325 | |
| 326 | if (crp->crp_etype != 0) { |
| 327 | error = crp->crp_etype; |
| 328 | dprintk("%s error in crp processing\n", __FUNCTION__); |
| 329 | goto bail; |
| 330 | } |
| 331 | |
| 332 | if (cse->error) { |
| 333 | error = cse->error; |
| 334 | dprintk("%s error in cse processing\n", __FUNCTION__); |
| 335 | goto bail; |
| 336 | } |
| 337 | |
| 338 | if (cop->dst && (error = copy_to_user(cop->dst, |
| 339 | cse->uio.uio_iov[0].iov_base, cop->len))) { |
| 340 | dprintk("%s bad dst copy\n", __FUNCTION__); |
| 341 | goto bail; |
| 342 | } |
| 343 | |
| 344 | if (cop->mac && |
| 345 | (error=copy_to_user(cop->mac, |
| 346 | (caddr_t)cse->uio.uio_iov[0].iov_base + cop->len, |
| 347 | cse->info.authsize))) { |
| 348 | dprintk("%s bad mac copy\n", __FUNCTION__); |
| 349 | goto bail; |
| 350 | } |
| 351 | |
| 352 | bail: |
| 353 | if (crp) |
| 354 | crypto_freereq(crp); |
| 355 | if (cse->uio.uio_iov[0].iov_base) |
| 356 | kfree(cse->uio.uio_iov[0].iov_base); |
| 357 | |
| 358 | return (error); |
| 359 | } |
| 360 | |
| 361 | static int |
| 362 | cryptodev_cb(void *op) |
| 363 | { |
| 364 | struct cryptop *crp = (struct cryptop *) op; |
| 365 | struct csession *cse = (struct csession *)crp->crp_opaque; |
| 366 | int error; |
| 367 | |
| 368 | dprintk("%s()\n", __FUNCTION__); |
| 369 | error = crp->crp_etype; |
| 370 | if (error == EAGAIN) { |
| 371 | crp->crp_flags &= ~CRYPTO_F_DONE; |
| 372 | #ifdef NOTYET |
| 373 | /* |
| 374 | * DAVIDM I am fairly sure that we should turn this into a batch |
| 375 | * request to stop bad karma/lockup, revisit |
| 376 | */ |
| 377 | crp->crp_flags |= CRYPTO_F_BATCH; |
| 378 | #endif |
| 379 | return crypto_dispatch(crp); |
| 380 | } |
| 381 | if (error != 0 || (crp->crp_flags & CRYPTO_F_DONE)) { |
| 382 | cse->error = error; |
| 383 | wake_up_interruptible(&crp->crp_waitq); |
| 384 | } |
| 385 | return (0); |
| 386 | } |
| 387 | |
| 388 | static int |
| 389 | cryptodevkey_cb(void *op) |
| 390 | { |
| 391 | struct cryptkop *krp = (struct cryptkop *) op; |
| 392 | dprintk("%s()\n", __FUNCTION__); |
| 393 | wake_up_interruptible(&krp->krp_waitq); |
| 394 | return (0); |
| 395 | } |
| 396 | |
| 397 | static int |
| 398 | cryptodev_key(struct crypt_kop *kop) |
| 399 | { |
| 400 | struct cryptkop *krp = NULL; |
| 401 | int error = EINVAL; |
| 402 | int in, out, size, i; |
| 403 | |
| 404 | dprintk("%s()\n", __FUNCTION__); |
| 405 | if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) { |
| 406 | dprintk("%s params too big\n", __FUNCTION__); |
| 407 | return (EFBIG); |
| 408 | } |
| 409 | |
| 410 | in = kop->crk_iparams; |
| 411 | out = kop->crk_oparams; |
| 412 | switch (kop->crk_op) { |
| 413 | case CRK_MOD_EXP: |
| 414 | if (in == 3 && out == 1) |
| 415 | break; |
| 416 | return (EINVAL); |
| 417 | case CRK_MOD_EXP_CRT: |
| 418 | if (in == 6 && out == 1) |
| 419 | break; |
| 420 | return (EINVAL); |
| 421 | case CRK_DSA_SIGN: |
| 422 | if (in == 5 && out == 2) |
| 423 | break; |
| 424 | return (EINVAL); |
| 425 | case CRK_DSA_VERIFY: |
| 426 | if (in == 7 && out == 0) |
| 427 | break; |
| 428 | return (EINVAL); |
| 429 | case CRK_DH_COMPUTE_KEY: |
| 430 | if (in == 3 && out == 1) |
| 431 | break; |
| 432 | return (EINVAL); |
| 433 | default: |
| 434 | return (EINVAL); |
| 435 | } |
| 436 | |
| 437 | krp = (struct cryptkop *)kmalloc(sizeof *krp, GFP_KERNEL); |
| 438 | if (!krp) |
| 439 | return (ENOMEM); |
| 440 | bzero(krp, sizeof *krp); |
| 441 | krp->krp_op = kop->crk_op; |
| 442 | krp->krp_status = kop->crk_status; |
| 443 | krp->krp_iparams = kop->crk_iparams; |
| 444 | krp->krp_oparams = kop->crk_oparams; |
| 445 | krp->krp_crid = kop->crk_crid; |
| 446 | krp->krp_status = 0; |
| 447 | krp->krp_flags = CRYPTO_KF_CBIMM; |
| 448 | krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb; |
| 449 | init_waitqueue_head(&krp->krp_waitq); |
| 450 | |
| 451 | for (i = 0; i < CRK_MAXPARAM; i++) |
| 452 | krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits; |
| 453 | for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) { |
| 454 | size = (krp->krp_param[i].crp_nbits + 7) / 8; |
| 455 | if (size == 0) |
| 456 | continue; |
| 457 | krp->krp_param[i].crp_p = (caddr_t) kmalloc(size, GFP_KERNEL); |
| 458 | if (i >= krp->krp_iparams) |
| 459 | continue; |
| 460 | error = copy_from_user(krp->krp_param[i].crp_p, |
| 461 | kop->crk_param[i].crp_p, size); |
| 462 | if (error) |
| 463 | goto fail; |
| 464 | } |
| 465 | |
| 466 | error = crypto_kdispatch(krp); |
| 467 | if (error) |
| 468 | goto fail; |
| 469 | |
| 470 | do { |
| 471 | error = wait_event_interruptible(krp->krp_waitq, |
| 472 | ((krp->krp_flags & CRYPTO_KF_DONE) != 0)); |
| 473 | /* |
| 474 | * we can't break out of this loop or we will leave behind |
| 475 | * a huge mess, however, staying here means if your driver |
| 476 | * is broken user applications can hang and not be killed. |
| 477 | * The solution, fix your driver :-) |
| 478 | */ |
| 479 | if (error) { |
| 480 | schedule(); |
| 481 | error = 0; |
| 482 | } |
| 483 | } while ((krp->krp_flags & CRYPTO_KF_DONE) == 0); |
| 484 | |
| 485 | dprintk("%s finished WAITING error=%d\n", __FUNCTION__, error); |
| 486 | |
| 487 | kop->crk_crid = krp->krp_crid; /* device that did the work */ |
| 488 | if (krp->krp_status != 0) { |
| 489 | error = krp->krp_status; |
| 490 | goto fail; |
| 491 | } |
| 492 | |
| 493 | for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) { |
| 494 | size = (krp->krp_param[i].crp_nbits + 7) / 8; |
| 495 | if (size == 0) |
| 496 | continue; |
| 497 | error = copy_to_user(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, |
| 498 | size); |
| 499 | if (error) |
| 500 | goto fail; |
| 501 | } |
| 502 | |
| 503 | fail: |
| 504 | if (krp) { |
| 505 | kop->crk_status = krp->krp_status; |
| 506 | for (i = 0; i < CRK_MAXPARAM; i++) { |
| 507 | if (krp->krp_param[i].crp_p) |
| 508 | kfree(krp->krp_param[i].crp_p); |
| 509 | } |
| 510 | kfree(krp); |
| 511 | } |
| 512 | return (error); |
| 513 | } |
| 514 | |
| 515 | static int |
| 516 | cryptodev_find(struct crypt_find_op *find) |
| 517 | { |
| 518 | device_t dev; |
| 519 | |
| 520 | if (find->crid != -1) { |
| 521 | dev = crypto_find_device_byhid(find->crid); |
| 522 | if (dev == NULL) |
| 523 | return (ENOENT); |
| 524 | strlcpy(find->name, device_get_nameunit(dev), |
| 525 | sizeof(find->name)); |
| 526 | } else { |
| 527 | find->crid = crypto_find_driver(find->name); |
| 528 | if (find->crid == -1) |
| 529 | return (ENOENT); |
| 530 | } |
| 531 | return (0); |
| 532 | } |
| 533 | |
| 534 | static struct csession * |
| 535 | csefind(struct fcrypt *fcr, u_int ses) |
| 536 | { |
| 537 | struct csession *cse; |
| 538 | |
| 539 | dprintk("%s()\n", __FUNCTION__); |
| 540 | list_for_each_entry(cse, &fcr->csessions, list) |
| 541 | if (cse->ses == ses) |
| 542 | return (cse); |
| 543 | return (NULL); |
| 544 | } |
| 545 | |
| 546 | static int |
| 547 | csedelete(struct fcrypt *fcr, struct csession *cse_del) |
| 548 | { |
| 549 | struct csession *cse; |
| 550 | |
| 551 | dprintk("%s()\n", __FUNCTION__); |
| 552 | list_for_each_entry(cse, &fcr->csessions, list) { |
| 553 | if (cse == cse_del) { |
| 554 | list_del(&cse->list); |
| 555 | return (1); |
| 556 | } |
| 557 | } |
| 558 | return (0); |
| 559 | } |
| 560 | |
| 561 | static struct csession * |
| 562 | cseadd(struct fcrypt *fcr, struct csession *cse) |
| 563 | { |
| 564 | dprintk("%s()\n", __FUNCTION__); |
| 565 | list_add_tail(&cse->list, &fcr->csessions); |
| 566 | cse->ses = fcr->sesn++; |
| 567 | return (cse); |
| 568 | } |
| 569 | |
| 570 | static struct csession * |
| 571 | csecreate(struct fcrypt *fcr, u_int64_t sid, struct cryptoini *crie, |
| 572 | struct cryptoini *cria, struct csession_info *info) |
| 573 | { |
| 574 | struct csession *cse; |
| 575 | |
| 576 | dprintk("%s()\n", __FUNCTION__); |
| 577 | cse = (struct csession *) kmalloc(sizeof(struct csession), GFP_KERNEL); |
| 578 | if (cse == NULL) |
| 579 | return NULL; |
| 580 | memset(cse, 0, sizeof(struct csession)); |
| 581 | |
| 582 | INIT_LIST_HEAD(&cse->list); |
| 583 | init_waitqueue_head(&cse->waitq); |
| 584 | |
| 585 | cse->key = crie->cri_key; |
| 586 | cse->keylen = crie->cri_klen/8; |
| 587 | cse->mackey = cria->cri_key; |
| 588 | cse->mackeylen = cria->cri_klen/8; |
| 589 | cse->sid = sid; |
| 590 | cse->cipher = crie->cri_alg; |
| 591 | cse->mac = cria->cri_alg; |
| 592 | cse->info = *info; |
| 593 | cseadd(fcr, cse); |
| 594 | return (cse); |
| 595 | } |
| 596 | |
| 597 | static int |
| 598 | csefree(struct csession *cse) |
| 599 | { |
| 600 | int error; |
| 601 | |
| 602 | dprintk("%s()\n", __FUNCTION__); |
| 603 | error = crypto_freesession(cse->sid); |
| 604 | if (cse->key) |
| 605 | kfree(cse->key); |
| 606 | if (cse->mackey) |
| 607 | kfree(cse->mackey); |
| 608 | kfree(cse); |
| 609 | return(error); |
| 610 | } |
| 611 | |
| 612 | static int |
| 613 | cryptodev_ioctl( |
| 614 | struct inode *inode, |
| 615 | struct file *filp, |
| 616 | unsigned int cmd, |
| 617 | unsigned long arg) |
| 618 | { |
| 619 | struct cryptoini cria, crie; |
| 620 | struct fcrypt *fcr = filp->private_data; |
| 621 | struct csession *cse; |
| 622 | struct csession_info info; |
| 623 | struct session2_op sop; |
| 624 | struct crypt_op cop; |
| 625 | struct crypt_kop kop; |
| 626 | struct crypt_find_op fop; |
| 627 | u_int64_t sid; |
| 628 | u_int32_t ses; |
| 629 | int feat, fd, error = 0, crid; |
| 630 | mm_segment_t fs; |
| 631 | |
| 632 | dprintk("%s(cmd=%x arg=%lx)\n", __FUNCTION__, cmd, arg); |
| 633 | |
| 634 | switch (cmd) { |
| 635 | |
| 636 | case CRIOGET: { |
| 637 | dprintk("%s(CRIOGET)\n", __FUNCTION__); |
| 638 | fs = get_fs(); |
| 639 | set_fs(get_ds()); |
| 640 | for (fd = 0; fd < files_fdtable(current->files)->max_fds; fd++) |
| 641 | if (files_fdtable(current->files)->fd[fd] == filp) |
| 642 | break; |
| 643 | fd = sys_dup(fd); |
| 644 | set_fs(fs); |
| 645 | put_user(fd, (int *) arg); |
| 646 | return IS_ERR_VALUE(fd) ? fd : 0; |
| 647 | } |
| 648 | |
| 649 | #define CIOCGSESSSTR (cmd == CIOCGSESSION ? "CIOCGSESSION" : "CIOCGSESSION2") |
| 650 | case CIOCGSESSION: |
| 651 | case CIOCGSESSION2: |
| 652 | dprintk("%s(%s)\n", __FUNCTION__, CIOCGSESSSTR); |
| 653 | memset(&crie, 0, sizeof(crie)); |
| 654 | memset(&cria, 0, sizeof(cria)); |
| 655 | memset(&info, 0, sizeof(info)); |
| 656 | memset(&sop, 0, sizeof(sop)); |
| 657 | |
| 658 | if (copy_from_user(&sop, (void*)arg, (cmd == CIOCGSESSION) ? |
| 659 | sizeof(struct session_op) : sizeof(sop))) { |
| 660 | dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR); |
| 661 | error = EFAULT; |
| 662 | goto bail; |
| 663 | } |
| 664 | |
| 665 | switch (sop.cipher) { |
| 666 | case 0: |
| 667 | dprintk("%s(%s) - no cipher\n", __FUNCTION__, CIOCGSESSSTR); |
| 668 | break; |
| 669 | case CRYPTO_NULL_CBC: |
| 670 | info.blocksize = NULL_BLOCK_LEN; |
| 671 | info.minkey = NULL_MIN_KEY_LEN; |
| 672 | info.maxkey = NULL_MAX_KEY_LEN; |
| 673 | break; |
| 674 | case CRYPTO_DES_CBC: |
| 675 | info.blocksize = DES_BLOCK_LEN; |
| 676 | info.minkey = DES_MIN_KEY_LEN; |
| 677 | info.maxkey = DES_MAX_KEY_LEN; |
| 678 | break; |
| 679 | case CRYPTO_3DES_CBC: |
| 680 | info.blocksize = DES3_BLOCK_LEN; |
| 681 | info.minkey = DES3_MIN_KEY_LEN; |
| 682 | info.maxkey = DES3_MAX_KEY_LEN; |
| 683 | break; |
| 684 | case CRYPTO_BLF_CBC: |
| 685 | info.blocksize = BLOWFISH_BLOCK_LEN; |
| 686 | info.minkey = BLOWFISH_MIN_KEY_LEN; |
| 687 | info.maxkey = BLOWFISH_MAX_KEY_LEN; |
| 688 | break; |
| 689 | case CRYPTO_CAST_CBC: |
| 690 | info.blocksize = CAST128_BLOCK_LEN; |
| 691 | info.minkey = CAST128_MIN_KEY_LEN; |
| 692 | info.maxkey = CAST128_MAX_KEY_LEN; |
| 693 | break; |
| 694 | case CRYPTO_SKIPJACK_CBC: |
| 695 | info.blocksize = SKIPJACK_BLOCK_LEN; |
| 696 | info.minkey = SKIPJACK_MIN_KEY_LEN; |
| 697 | info.maxkey = SKIPJACK_MAX_KEY_LEN; |
| 698 | break; |
| 699 | case CRYPTO_AES_CBC: |
| 700 | info.blocksize = AES_BLOCK_LEN; |
| 701 | info.minkey = AES_MIN_KEY_LEN; |
| 702 | info.maxkey = AES_MAX_KEY_LEN; |
| 703 | break; |
| 704 | case CRYPTO_ARC4: |
| 705 | info.blocksize = ARC4_BLOCK_LEN; |
| 706 | info.minkey = ARC4_MIN_KEY_LEN; |
| 707 | info.maxkey = ARC4_MAX_KEY_LEN; |
| 708 | break; |
| 709 | case CRYPTO_CAMELLIA_CBC: |
| 710 | info.blocksize = CAMELLIA_BLOCK_LEN; |
| 711 | info.minkey = CAMELLIA_MIN_KEY_LEN; |
| 712 | info.maxkey = CAMELLIA_MAX_KEY_LEN; |
| 713 | break; |
| 714 | default: |
| 715 | dprintk("%s(%s) - bad cipher\n", __FUNCTION__, CIOCGSESSSTR); |
| 716 | error = EINVAL; |
| 717 | goto bail; |
| 718 | } |
| 719 | |
| 720 | switch (sop.mac) { |
| 721 | case 0: |
| 722 | dprintk("%s(%s) - no mac\n", __FUNCTION__, CIOCGSESSSTR); |
| 723 | break; |
| 724 | case CRYPTO_NULL_HMAC: |
| 725 | info.authsize = NULL_HASH_LEN; |
| 726 | break; |
| 727 | case CRYPTO_MD5: |
| 728 | info.authsize = MD5_HASH_LEN; |
| 729 | break; |
| 730 | case CRYPTO_SHA1: |
| 731 | info.authsize = SHA1_HASH_LEN; |
| 732 | break; |
| 733 | case CRYPTO_SHA2_256: |
| 734 | info.authsize = SHA2_256_HASH_LEN; |
| 735 | break; |
| 736 | case CRYPTO_SHA2_384: |
| 737 | info.authsize = SHA2_384_HASH_LEN; |
| 738 | break; |
| 739 | case CRYPTO_SHA2_512: |
| 740 | info.authsize = SHA2_512_HASH_LEN; |
| 741 | break; |
| 742 | case CRYPTO_RIPEMD160: |
| 743 | info.authsize = RIPEMD160_HASH_LEN; |
| 744 | break; |
| 745 | case CRYPTO_MD5_HMAC: |
| 746 | info.authsize = MD5_HASH_LEN; |
| 747 | break; |
| 748 | case CRYPTO_SHA1_HMAC: |
| 749 | info.authsize = SHA1_HASH_LEN; |
| 750 | break; |
| 751 | case CRYPTO_SHA2_256_HMAC: |
| 752 | info.authsize = SHA2_256_HASH_LEN; |
| 753 | break; |
| 754 | case CRYPTO_SHA2_384_HMAC: |
| 755 | info.authsize = SHA2_384_HASH_LEN; |
| 756 | break; |
| 757 | case CRYPTO_SHA2_512_HMAC: |
| 758 | info.authsize = SHA2_512_HASH_LEN; |
| 759 | break; |
| 760 | case CRYPTO_RIPEMD160_HMAC: |
| 761 | info.authsize = RIPEMD160_HASH_LEN; |
| 762 | break; |
| 763 | default: |
| 764 | dprintk("%s(%s) - bad mac\n", __FUNCTION__, CIOCGSESSSTR); |
| 765 | error = EINVAL; |
| 766 | goto bail; |
| 767 | } |
| 768 | |
| 769 | if (info.blocksize) { |
| 770 | crie.cri_alg = sop.cipher; |
| 771 | crie.cri_klen = sop.keylen * 8; |
| 772 | if ((info.maxkey && sop.keylen > info.maxkey) || |
| 773 | sop.keylen < info.minkey) { |
| 774 | dprintk("%s(%s) - bad key\n", __FUNCTION__, CIOCGSESSSTR); |
| 775 | error = EINVAL; |
| 776 | goto bail; |
| 777 | } |
| 778 | |
| 779 | crie.cri_key = (u_int8_t *) kmalloc(crie.cri_klen/8+1, GFP_KERNEL); |
| 780 | if (copy_from_user(crie.cri_key, sop.key, |
| 781 | crie.cri_klen/8)) { |
| 782 | dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR); |
| 783 | error = EFAULT; |
| 784 | goto bail; |
| 785 | } |
| 786 | if (info.authsize) |
| 787 | crie.cri_next = &cria; |
| 788 | } |
| 789 | |
| 790 | if (info.authsize) { |
| 791 | cria.cri_alg = sop.mac; |
| 792 | cria.cri_klen = sop.mackeylen * 8; |
| 793 | if ((info.maxkey && sop.mackeylen > info.maxkey) || |
| 794 | sop.keylen < info.minkey) { |
| 795 | dprintk("%s(%s) - mackeylen %d\n", __FUNCTION__, CIOCGSESSSTR, |
| 796 | sop.mackeylen); |
| 797 | error = EINVAL; |
| 798 | goto bail; |
| 799 | } |
| 800 | |
| 801 | if (cria.cri_klen) { |
| 802 | cria.cri_key = (u_int8_t *) kmalloc(cria.cri_klen/8,GFP_KERNEL); |
| 803 | if (copy_from_user(cria.cri_key, sop.mackey, |
| 804 | cria.cri_klen / 8)) { |
| 805 | dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR); |
| 806 | error = EFAULT; |
| 807 | goto bail; |
| 808 | } |
| 809 | } |
| 810 | } |
| 811 | |
| 812 | /* NB: CIOGSESSION2 has the crid */ |
| 813 | if (cmd == CIOCGSESSION2) { |
| 814 | crid = sop.crid; |
| 815 | error = checkcrid(crid); |
| 816 | if (error) { |
| 817 | dprintk("%s(%s) - checkcrid %x\n", __FUNCTION__, |
| 818 | CIOCGSESSSTR, error); |
| 819 | goto bail; |
| 820 | } |
| 821 | } else { |
| 822 | /* allow either HW or SW to be used */ |
| 823 | crid = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; |
| 824 | } |
| 825 | error = crypto_newsession(&sid, (info.blocksize ? &crie : &cria), crid); |
| 826 | if (error) { |
| 827 | dprintk("%s(%s) - newsession %d\n",__FUNCTION__,CIOCGSESSSTR,error); |
| 828 | goto bail; |
| 829 | } |
| 830 | |
| 831 | cse = csecreate(fcr, sid, &crie, &cria, &info); |
| 832 | if (cse == NULL) { |
| 833 | crypto_freesession(sid); |
| 834 | error = EINVAL; |
| 835 | dprintk("%s(%s) - csecreate failed\n", __FUNCTION__, CIOCGSESSSTR); |
| 836 | goto bail; |
| 837 | } |
| 838 | sop.ses = cse->ses; |
| 839 | |
| 840 | if (cmd == CIOCGSESSION2) { |
| 841 | /* return hardware/driver id */ |
| 842 | sop.crid = CRYPTO_SESID2HID(cse->sid); |
| 843 | } |
| 844 | |
| 845 | if (copy_to_user((void*)arg, &sop, (cmd == CIOCGSESSION) ? |
| 846 | sizeof(struct session_op) : sizeof(sop))) { |
| 847 | dprintk("%s(%s) - bad copy\n", __FUNCTION__, CIOCGSESSSTR); |
| 848 | error = EFAULT; |
| 849 | } |
| 850 | bail: |
| 851 | if (error) { |
| 852 | dprintk("%s(%s) - bail %d\n", __FUNCTION__, CIOCGSESSSTR, error); |
| 853 | if (crie.cri_key) |
| 854 | kfree(crie.cri_key); |
| 855 | if (cria.cri_key) |
| 856 | kfree(cria.cri_key); |
| 857 | } |
| 858 | break; |
| 859 | case CIOCFSESSION: |
| 860 | dprintk("%s(CIOCFSESSION)\n", __FUNCTION__); |
| 861 | get_user(ses, (uint32_t*)arg); |
| 862 | cse = csefind(fcr, ses); |
| 863 | if (cse == NULL) { |
| 864 | error = EINVAL; |
| 865 | dprintk("%s(CIOCFSESSION) - Fail %d\n", __FUNCTION__, error); |
| 866 | break; |
| 867 | } |
| 868 | csedelete(fcr, cse); |
| 869 | error = csefree(cse); |
| 870 | break; |
| 871 | case CIOCCRYPT: |
| 872 | dprintk("%s(CIOCCRYPT)\n", __FUNCTION__); |
| 873 | if(copy_from_user(&cop, (void*)arg, sizeof(cop))) { |
| 874 | dprintk("%s(CIOCCRYPT) - bad copy\n", __FUNCTION__); |
| 875 | error = EFAULT; |
| 876 | goto bail; |
| 877 | } |
| 878 | cse = csefind(fcr, cop.ses); |
| 879 | if (cse == NULL) { |
| 880 | error = EINVAL; |
| 881 | dprintk("%s(CIOCCRYPT) - Fail %d\n", __FUNCTION__, error); |
| 882 | break; |
| 883 | } |
| 884 | error = cryptodev_op(cse, &cop); |
| 885 | if(copy_to_user((void*)arg, &cop, sizeof(cop))) { |
| 886 | dprintk("%s(CIOCCRYPT) - bad return copy\n", __FUNCTION__); |
| 887 | error = EFAULT; |
| 888 | goto bail; |
| 889 | } |
| 890 | break; |
| 891 | case CIOCKEY: |
| 892 | case CIOCKEY2: |
| 893 | dprintk("%s(CIOCKEY)\n", __FUNCTION__); |
| 894 | if (!crypto_userasymcrypto) |
| 895 | return (EPERM); /* XXX compat? */ |
| 896 | if(copy_from_user(&kop, (void*)arg, sizeof(kop))) { |
| 897 | dprintk("%s(CIOCKEY) - bad copy\n", __FUNCTION__); |
| 898 | error = EFAULT; |
| 899 | goto bail; |
| 900 | } |
| 901 | if (cmd == CIOCKEY) { |
| 902 | /* NB: crypto core enforces s/w driver use */ |
| 903 | kop.crk_crid = |
| 904 | CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; |
| 905 | } |
| 906 | error = cryptodev_key(&kop); |
| 907 | if(copy_to_user((void*)arg, &kop, sizeof(kop))) { |
| 908 | dprintk("%s(CIOCGKEY) - bad return copy\n", __FUNCTION__); |
| 909 | error = EFAULT; |
| 910 | goto bail; |
| 911 | } |
| 912 | break; |
| 913 | case CIOCASYMFEAT: |
| 914 | dprintk("%s(CIOCASYMFEAT)\n", __FUNCTION__); |
| 915 | if (!crypto_userasymcrypto) { |
| 916 | /* |
| 917 | * NB: if user asym crypto operations are |
| 918 | * not permitted return "no algorithms" |
| 919 | * so well-behaved applications will just |
| 920 | * fallback to doing them in software. |
| 921 | */ |
| 922 | feat = 0; |
| 923 | } else |
| 924 | error = crypto_getfeat(&feat); |
| 925 | if (!error) { |
| 926 | error = copy_to_user((void*)arg, &feat, sizeof(feat)); |
| 927 | } |
| 928 | break; |
| 929 | case CIOCFINDDEV: |
| 930 | if (copy_from_user(&fop, (void*)arg, sizeof(fop))) { |
| 931 | dprintk("%s(CIOCFINDDEV) - bad copy\n", __FUNCTION__); |
| 932 | error = EFAULT; |
| 933 | goto bail; |
| 934 | } |
| 935 | error = cryptodev_find(&fop); |
| 936 | if (copy_to_user((void*)arg, &fop, sizeof(fop))) { |
| 937 | dprintk("%s(CIOCFINDDEV) - bad return copy\n", __FUNCTION__); |
| 938 | error = EFAULT; |
| 939 | goto bail; |
| 940 | } |
| 941 | break; |
| 942 | default: |
| 943 | dprintk("%s(unknown ioctl 0x%x)\n", __FUNCTION__, cmd); |
| 944 | error = EINVAL; |
| 945 | break; |
| 946 | } |
| 947 | return(-error); |
| 948 | } |
| 949 | |
| 950 | #ifdef HAVE_UNLOCKED_IOCTL |
| 951 | static long |
| 952 | cryptodev_unlocked_ioctl( |
| 953 | struct file *filp, |
| 954 | unsigned int cmd, |
| 955 | unsigned long arg) |
| 956 | { |
| 957 | return cryptodev_ioctl(NULL, filp, cmd, arg); |
| 958 | } |
| 959 | #endif |
| 960 | |
| 961 | static int |
| 962 | cryptodev_open(struct inode *inode, struct file *filp) |
| 963 | { |
| 964 | struct fcrypt *fcr; |
| 965 | |
| 966 | dprintk("%s()\n", __FUNCTION__); |
| 967 | if (filp->private_data) { |
| 968 | printk("cryptodev: Private data already exists !\n"); |
| 969 | return(0); |
| 970 | } |
| 971 | |
| 972 | fcr = kmalloc(sizeof(*fcr), GFP_KERNEL); |
| 973 | if (!fcr) { |
| 974 | dprintk("%s() - malloc failed\n", __FUNCTION__); |
| 975 | return(-ENOMEM); |
| 976 | } |
| 977 | memset(fcr, 0, sizeof(*fcr)); |
| 978 | |
| 979 | INIT_LIST_HEAD(&fcr->csessions); |
| 980 | filp->private_data = fcr; |
| 981 | return(0); |
| 982 | } |
| 983 | |
| 984 | static int |
| 985 | cryptodev_release(struct inode *inode, struct file *filp) |
| 986 | { |
| 987 | struct fcrypt *fcr = filp->private_data; |
| 988 | struct csession *cse, *tmp; |
| 989 | |
| 990 | dprintk("%s()\n", __FUNCTION__); |
| 991 | if (!filp) { |
| 992 | printk("cryptodev: No private data on release\n"); |
| 993 | return(0); |
| 994 | } |
| 995 | |
| 996 | list_for_each_entry_safe(cse, tmp, &fcr->csessions, list) { |
| 997 | list_del(&cse->list); |
| 998 | (void)csefree(cse); |
| 999 | } |
| 1000 | filp->private_data = NULL; |
| 1001 | kfree(fcr); |
| 1002 | return(0); |
| 1003 | } |
| 1004 | |
| 1005 | static struct file_operations cryptodev_fops = { |
| 1006 | .owner = THIS_MODULE, |
| 1007 | .open = cryptodev_open, |
| 1008 | .release = cryptodev_release, |
| 1009 | .ioctl = cryptodev_ioctl, |
| 1010 | #ifdef HAVE_UNLOCKED_IOCTL |
| 1011 | .unlocked_ioctl = cryptodev_unlocked_ioctl, |
| 1012 | #endif |
| 1013 | }; |
| 1014 | |
| 1015 | static struct miscdevice cryptodev = { |
| 1016 | .minor = CRYPTODEV_MINOR, |
| 1017 | .name = "crypto", |
| 1018 | .fops = &cryptodev_fops, |
| 1019 | }; |
| 1020 | |
| 1021 | static int __init |
| 1022 | cryptodev_init(void) |
| 1023 | { |
| 1024 | int rc; |
| 1025 | |
| 1026 | dprintk("%s(%p)\n", __FUNCTION__, cryptodev_init); |
| 1027 | rc = misc_register(&cryptodev); |
| 1028 | if (rc) { |
| 1029 | printk(KERN_ERR "cryptodev: registration of /dev/crypto failed\n"); |
| 1030 | return(rc); |
| 1031 | } |
| 1032 | |
| 1033 | return(0); |
| 1034 | } |
| 1035 | |
| 1036 | static void __exit |
| 1037 | cryptodev_exit(void) |
| 1038 | { |
| 1039 | dprintk("%s()\n", __FUNCTION__); |
| 1040 | misc_deregister(&cryptodev); |
| 1041 | } |
| 1042 | |
| 1043 | module_init(cryptodev_init); |
| 1044 | module_exit(cryptodev_exit); |
| 1045 | |
| 1046 | MODULE_LICENSE("BSD"); |
| 1047 | MODULE_AUTHOR("David McCullough <david_mccullough@securecomputing.com>"); |
| 1048 | MODULE_DESCRIPTION("Cryptodev (user interface to OCF)"); |
| 1049 | |
