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 $ */
5 * Copyright (c) 2001 Theo de Raadt
6 * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
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.
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
39 #include <sys/device.h>
42 #include <sys/sysctl.h>
44 #include <sys/filedesc.h>
45 #include <sys/errno.h>
47 #include <sys/random.h>
49 #include <sys/module.h>
50 #include <sys/kernel.h>
51 #include <sys/fcntl.h>
54 #include <sys/file2.h>
55 #include <sys/thread2.h>
56 #include <sys/mplock2.h>
58 #include <opencrypto/cryptodev.h>
59 #include <opencrypto/xform.h>
62 TAILQ_ENTRY(csession) next;
68 struct enc_xform *txform;
70 struct auth_hash *thash;
74 u_char tmp_iv[EALG_MAX_BLOCK_LEN];
85 TAILQ_HEAD(csessionlist, csession) csessions;
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 *);
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
107 static struct csession *csefind(struct fcrypt *, u_int);
108 static int csedelete(struct fcrypt *, struct csession *);
109 static struct csession *cseadd(struct fcrypt *, struct csession *);
110 static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t,
111 u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *,
113 static int csefree(struct csession *);
115 static int cryptodev_op(struct csession *, struct crypt_op *, struct ucred *);
116 static int cryptodev_key(struct crypt_kop *);
117 static int cryptodev_find(struct crypt_find_op *);
123 struct ucred *active_cred,
130 * Check a crypto identifier to see if it requested
131 * a software device/driver. This can be done either
132 * by device name/class or through search constraints.
135 checkforsoftware(int crid)
137 if (crid & CRYPTOCAP_F_SOFTWARE)
138 return EINVAL; /* XXX */
139 if ((crid & CRYPTOCAP_F_HARDWARE) == 0 &&
140 (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0)
141 return EINVAL; /* XXX */
147 cryptof_ioctl(struct file *fp, u_long cmd, caddr_t data,
148 struct ucred *cred, struct sysmsg *msg)
150 #define SES2(p) ((struct session2_op *)p)
151 struct cryptoini cria, crie;
152 struct fcrypt *fcr = fp->f_data;
153 struct csession *cse;
154 struct session_op *sop;
155 struct crypt_op *cop;
156 struct enc_xform *txform = NULL;
157 struct auth_hash *thash = NULL;
158 struct crypt_kop *kop;
166 sop = (struct session_op *)data;
167 switch (sop->cipher) {
171 txform = &enc_xform_des;
173 case CRYPTO_3DES_CBC:
174 txform = &enc_xform_3des;
177 txform = &enc_xform_blf;
179 case CRYPTO_CAST_CBC:
180 txform = &enc_xform_cast5;
182 case CRYPTO_SKIPJACK_CBC:
183 txform = &enc_xform_skipjack;
186 txform = &enc_xform_rijndael128;
189 txform = &enc_xform_aes_xts;
192 txform = &enc_xform_aes_ctr;
194 case CRYPTO_NULL_CBC:
195 txform = &enc_xform_null;
198 txform = &enc_xform_arc4;
200 case CRYPTO_CAMELLIA_CBC:
201 txform = &enc_xform_camellia;
203 case CRYPTO_TWOFISH_CBC:
204 txform = &enc_xform_twofish;
206 case CRYPTO_SERPENT_CBC:
207 txform = &enc_xform_serpent;
216 case CRYPTO_MD5_HMAC:
217 thash = &auth_hash_hmac_md5;
219 case CRYPTO_SHA1_HMAC:
220 thash = &auth_hash_hmac_sha1;
222 case CRYPTO_SHA2_256_HMAC:
223 thash = &auth_hash_hmac_sha2_256;
225 case CRYPTO_SHA2_384_HMAC:
226 thash = &auth_hash_hmac_sha2_384;
228 case CRYPTO_SHA2_512_HMAC:
229 thash = &auth_hash_hmac_sha2_512;
231 case CRYPTO_RIPEMD160_HMAC:
232 thash = &auth_hash_hmac_ripemd_160;
236 thash = &auth_hash_md5;
239 thash = &auth_hash_sha1;
242 case CRYPTO_NULL_HMAC:
243 thash = &auth_hash_null;
249 bzero(&crie, sizeof(crie));
250 bzero(&cria, sizeof(cria));
253 crie.cri_alg = txform->type;
254 crie.cri_klen = sop->keylen * 8;
255 if (sop->keylen > txform->maxkey ||
256 sop->keylen < txform->minkey) {
261 crie.cri_key = kmalloc(crie.cri_klen / 8,
263 if ((error = copyin(sop->key, crie.cri_key,
267 crie.cri_next = &cria;
271 cria.cri_alg = thash->type;
272 cria.cri_klen = sop->mackeylen * 8;
273 if (sop->mackeylen != thash->keysize) {
279 cria.cri_key = kmalloc(cria.cri_klen / 8,
281 if ((error = copyin(sop->mackey, cria.cri_key,
287 /* NB: CIOGSESSION2 has the crid */
288 if (cmd == CIOCGSESSION2) {
289 crid = SES2(sop)->crid;
290 error = checkforsoftware(crid);
294 crid = CRYPTOCAP_F_HARDWARE;
295 if (crypto_devallowsoft)
296 crid |= CRYPTOCAP_F_SOFTWARE;
298 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid);
302 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen,
303 cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform,
307 crypto_freesession(sid);
312 if (cmd == CIOCGSESSION2) {
313 /* return hardware/driver id */
314 SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid);
319 bzero(crie.cri_key, crie.cri_klen / 8);
320 kfree(crie.cri_key, M_XDATA);
323 bzero(crie.cri_key, crie.cri_klen / 8);
324 kfree(cria.cri_key, M_XDATA);
329 ses = *(u_int32_t *)data;
330 cse = csefind(fcr, ses);
334 error = csefree(cse);
337 cop = (struct crypt_op *)data;
338 cse = csefind(fcr, cop->ses);
341 error = cryptodev_op(cse, cop, cred);
345 if (!crypto_userasymcrypto)
346 return (EPERM); /* XXX compat? */
348 kop = (struct crypt_kop *)data;
349 if (cmd == CIOCKEY) {
350 /* NB: crypto core enforces s/w driver use */
352 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
354 error = cryptodev_key(kop);
358 if (!crypto_userasymcrypto) {
360 * NB: if user asym crypto operations are
361 * not permitted return "no algorithms"
362 * so well-behaved applications will just
363 * fallback to doing them in software.
367 error = crypto_getfeat((int *)data);
370 error = cryptodev_find((struct crypt_find_op *)data);
380 static int cryptodev_cb(void *);
384 cryptodev_op(struct csession *cse, struct crypt_op *cop,
385 struct ucred *active_cred)
387 struct cryptop *crp = NULL;
388 struct cryptodesc *crde = NULL, *crda = NULL;
391 if (cop->len > 256*1024-4)
395 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0)
399 bzero(&cse->uio, sizeof(cse->uio));
400 cse->uio.uio_iov = &cse->iovec;
401 cse->uio.uio_iovcnt = 1;
402 cse->uio.uio_offset = 0;
403 cse->uio.uio_resid = cop->len;
404 cse->uio.uio_segflg = UIO_SYSSPACE;
405 cse->uio.uio_rw = UIO_WRITE;
406 /* XXX: not sure, was td, now curthread? */
407 cse->uio.uio_td = curthread;
408 cse->uio.uio_iov[0].iov_len = cop->len;
410 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize;
411 cse->uio.uio_resid += cse->thash->hashsize;
413 cse->uio.uio_iov[0].iov_base = kmalloc(cse->uio.uio_iov[0].iov_len,
416 crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL));
423 crda = crp->crp_desc;
425 crde = crda->crd_next;
428 crde = crp->crp_desc;
435 if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len)))
440 crda->crd_len = cop->len;
441 crda->crd_inject = cop->len;
443 crda->crd_alg = cse->mac;
444 crda->crd_key = cse->mackey;
445 crda->crd_klen = cse->mackeylen * 8;
449 if (cop->op == COP_ENCRYPT)
450 crde->crd_flags |= CRD_F_ENCRYPT;
452 crde->crd_flags &= ~CRD_F_ENCRYPT;
453 crde->crd_len = cop->len;
454 crde->crd_inject = 0;
456 crde->crd_alg = cse->cipher;
457 crde->crd_key = cse->key;
458 crde->crd_klen = cse->keylen * 8;
461 crp->crp_ilen = cop->len;
462 crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
463 | (cop->flags & COP_F_BATCH);
464 crp->crp_buf = (caddr_t)&cse->uio;
465 crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
466 crp->crp_sid = cse->sid;
467 crp->crp_opaque = (void *)cse;
474 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
478 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize)))
480 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize);
481 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
483 } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
486 crde->crd_flags |= CRD_F_IV_PRESENT;
487 crde->crd_skip = cse->txform->blocksize;
488 crde->crd_len -= cse->txform->blocksize;
491 if (cop->mac && crda == NULL) {
498 * Let the dispatch run unlocked, then, interlock against the
499 * callback before checking if the operation completed and going
500 * to sleep. This insures drivers don't inherit our lock which
501 * results in a lock order reversal between crypto_dispatch forced
502 * entry and the crypto_done callback into us.
504 error = crypto_dispatch(crp);
505 lockmgr(&cse->lock, LK_EXCLUSIVE);
506 if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0)
507 error = lksleep(crp, &cse->lock, 0, "crydev", 0);
508 lockmgr(&cse->lock, LK_RELEASE);
513 if (crp->crp_etype == EAGAIN) {
515 crp->crp_flags &= ~CRYPTO_F_DONE;
519 if (crp->crp_etype != 0) {
520 error = crp->crp_etype;
530 (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len)))
534 (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len,
535 cop->mac, cse->thash->hashsize)))
541 if (cse->uio.uio_iov[0].iov_base)
542 kfree(cse->uio.uio_iov[0].iov_base, M_XDATA);
548 cryptodev_cb(void *op)
550 struct cryptop *crp = (struct cryptop *) op;
551 struct csession *cse = (struct csession *)crp->crp_opaque;
553 lockmgr(&cse->lock, LK_EXCLUSIVE);
554 cse->error = crp->crp_etype;
556 lockmgr(&cse->lock, LK_RELEASE);
561 cryptodevkey_cb(void *op)
563 struct cryptkop *krp = (struct cryptkop *) op;
570 cryptodev_key(struct crypt_kop *kop)
572 struct cryptkop *krp = NULL;
574 int in, out, size, i;
576 if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) {
580 in = kop->crk_iparams;
581 out = kop->crk_oparams;
582 switch (kop->crk_op) {
584 if (in == 3 && out == 1)
587 case CRK_MOD_EXP_CRT:
588 if (in == 6 && out == 1)
592 if (in == 5 && out == 2)
596 if (in == 7 && out == 0)
599 case CRK_DH_COMPUTE_KEY:
600 if (in == 3 && out == 1)
607 krp = (struct cryptkop *)kmalloc(sizeof *krp, M_XDATA, M_WAITOK | M_ZERO);
608 krp->krp_op = kop->crk_op;
609 krp->krp_status = kop->crk_status;
610 krp->krp_iparams = kop->crk_iparams;
611 krp->krp_oparams = kop->crk_oparams;
612 krp->krp_crid = kop->crk_crid;
614 krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
616 for (i = 0; i < CRK_MAXPARAM; i++) {
617 if (kop->crk_param[i].crp_nbits > 65536)
618 /* Limit is the same as in OpenBSD */
620 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits;
622 for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) {
623 size = (krp->krp_param[i].crp_nbits + 7) / 8;
626 krp->krp_param[i].crp_p = kmalloc(size, M_XDATA, M_WAITOK);
627 if (i >= krp->krp_iparams)
629 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size);
634 error = crypto_kdispatch(krp);
637 error = tsleep(krp, 0, "crydev", 0);
639 /* XXX can this happen? if so, how do we recover? */
643 kop->crk_crid = krp->krp_crid; /* device that did the work */
644 if (krp->krp_status != 0) {
645 error = krp->krp_status;
649 for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) {
650 size = (krp->krp_param[i].crp_nbits + 7) / 8;
653 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size);
660 kop->crk_status = krp->krp_status;
661 for (i = 0; i < CRK_MAXPARAM; i++) {
662 if (krp->krp_param[i].crp_p) {
663 bzero(krp->krp_param[i].crp_p,
664 (krp->krp_param[i].crp_nbits + 7) / 8);
665 kfree(krp->krp_param[i].crp_p, M_XDATA);
674 cryptodev_find(struct crypt_find_op *find)
678 if (find->crid != -1) {
679 dev = crypto_find_device_byhid(find->crid);
682 strlcpy(find->name, device_get_nameunit(dev),
685 find->crid = crypto_find_driver(find->name);
686 if (find->crid == -1)
696 cryptof_kqfilter(struct file *fp, struct knote *kn)
706 cryptof_stat(struct file *fp, struct stat *sb, struct ucred *cred)
712 * MPALMOSTSAFE - acquires mplock
715 cryptof_close(struct file *fp)
717 struct fcrypt *fcr = fp->f_data;
718 struct csession *cse;
721 fcr = (struct fcrypt *)fp->f_data;
722 while ((cse = TAILQ_FIRST(&fcr->csessions))) {
723 TAILQ_REMOVE(&fcr->csessions, cse, next);
733 static struct csession *
734 csefind(struct fcrypt *fcr, u_int ses)
736 struct csession *cse;
738 TAILQ_FOREACH(cse, &fcr->csessions, next)
745 csedelete(struct fcrypt *fcr, struct csession *cse_del)
747 struct csession *cse;
749 TAILQ_FOREACH(cse, &fcr->csessions, next) {
750 if (cse == cse_del) {
751 TAILQ_REMOVE(&fcr->csessions, cse, next);
758 static struct csession *
759 cseadd(struct fcrypt *fcr, struct csession *cse)
761 TAILQ_INSERT_TAIL(&fcr->csessions, cse, next);
762 cse->ses = fcr->sesn++;
767 csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen,
768 caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac,
769 struct enc_xform *txform, struct auth_hash *thash)
771 struct csession *cse;
773 cse = kmalloc(sizeof(struct csession), M_XDATA, M_WAITOK | M_ZERO);
776 lockinit(&cse->lock, "cryptodev", 0, LK_CANRECURSE);
778 cse->keylen = keylen/8;
779 cse->mackey = mackey;
780 cse->mackeylen = mackeylen/8;
782 cse->cipher = cipher;
784 cse->txform = txform;
791 csefree(struct csession *cse)
795 error = crypto_freesession(cse->sid);
796 lockuninit(&cse->lock);
798 kfree(cse->key, M_XDATA);
800 kfree(cse->mackey, M_XDATA);
806 cryptoopen(struct dev_open_args *ap)
812 cryptoread(struct dev_read_args *ap)
818 cryptowrite(struct dev_write_args *ap)
824 cryptoioctl(struct dev_ioctl_args *ap)
826 struct thread *td = curthread;
833 fcr = kmalloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK);
834 TAILQ_INIT(&fcr->csessions);
837 KKASSERT(td->td_lwp);
838 error = falloc(td->td_lwp, &f, &fd);
844 /* falloc automatically provides an extra reference to 'f'. */
845 f->f_flag = FREAD | FWRITE;
846 f->f_type = DTYPE_CRYPTO;
847 f->f_ops = &cryptofops;
849 fsetfd(td->td_proc->p_fd, f, fd);
850 *(u_int32_t *)ap->a_data = fd;
855 error = cryptodev_find((struct crypt_find_op *)ap->a_data);
858 error = crypto_getfeat((int *)ap->a_data);
867 static struct dev_ops crypto_ops = {
868 { "crypto", 0, D_MPSAFE },
869 .d_open = cryptoopen,
870 .d_read = cryptoread,
871 .d_write = cryptowrite,
872 .d_ioctl = cryptoioctl,
876 * Initialization code, both for static and dynamic loading.
879 cryptodev_modevent(module_t mod, int type, void *unused)
884 kprintf("crypto: <crypto device>\n");
885 make_dev(&crypto_ops, 0, UID_ROOT, GID_WHEEL,
889 /*XXX disallow if active sessions */
890 //dev_ops_remove(&crypto_ops, 0, 0);
891 dev_ops_remove_all(&crypto_ops);
897 static moduledata_t cryptodev_mod = {
902 MODULE_VERSION(cryptodev, 1);
903 DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
904 MODULE_DEPEND(cryptodev, crypto, 1, 1, 1);
905 MODULE_DEPEND(cryptodev, zlib, 1, 1, 1);