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/* $OpenBSD: softraid_crypto.c,v 1.139 2020/07/13 00:06:22 kn Exp $ */
/*
* Copyright (c) 2007 Marco Peereboom <marco@peereboom.us>
* Copyright (c) 2008 Hans-Joerg Hoexer <hshoexer@openbsd.org>
* Copyright (c) 2008 Damien Miller <djm@mindrot.org>
* Copyright (c) 2009 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "bio.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/kernel.h>
#include <sys/disk.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/sensors.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/dkio.h>
#include <crypto/cryptodev.h>
#include <crypto/rijndael.h>
#include <crypto/md5.h>
#include <crypto/sha1.h>
#include <crypto/sha2.h>
#include <crypto/hmac.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_disk.h>
#include <dev/softraidvar.h>
/*
* The per-I/O data that we need to preallocate. We cannot afford to allow I/O
* to start failing when memory pressure kicks in. We can store this in the WU
* because we assert that only one ccb per WU will ever be active.
*/
struct sr_crypto_wu {
struct sr_workunit cr_wu; /* Must be first. */
struct uio cr_uio;
struct iovec cr_iov;
struct cryptop *cr_crp;
void *cr_dmabuf;
};
struct sr_crypto_wu *sr_crypto_prepare(struct sr_workunit *, int);
int sr_crypto_create_keys(struct sr_discipline *);
int sr_crypto_get_kdf(struct bioc_createraid *,
struct sr_discipline *);
int sr_crypto_decrypt(u_char *, u_char *, u_char *, size_t, int);
int sr_crypto_encrypt(u_char *, u_char *, u_char *, size_t, int);
int sr_crypto_decrypt_key(struct sr_discipline *);
int sr_crypto_change_maskkey(struct sr_discipline *,
struct sr_crypto_kdfinfo *, struct sr_crypto_kdfinfo *);
int sr_crypto_create(struct sr_discipline *,
struct bioc_createraid *, int, int64_t);
int sr_crypto_assemble(struct sr_discipline *,
struct bioc_createraid *, int, void *);
int sr_crypto_alloc_resources(struct sr_discipline *);
void sr_crypto_free_resources(struct sr_discipline *);
int sr_crypto_ioctl(struct sr_discipline *,
struct bioc_discipline *);
int sr_crypto_meta_opt_handler(struct sr_discipline *,
struct sr_meta_opt_hdr *);
void sr_crypto_write(struct cryptop *);
int sr_crypto_rw(struct sr_workunit *);
int sr_crypto_dev_rw(struct sr_workunit *, struct sr_crypto_wu *);
void sr_crypto_done(struct sr_workunit *);
void sr_crypto_read(struct cryptop *);
void sr_crypto_calculate_check_hmac_sha1(u_int8_t *, int,
u_int8_t *, int, u_char *);
void sr_crypto_hotplug(struct sr_discipline *, struct disk *, int);
#ifdef SR_DEBUG0
void sr_crypto_dumpkeys(struct sr_discipline *);
#endif
/* Discipline initialisation. */
void
sr_crypto_discipline_init(struct sr_discipline *sd)
{
int i;
/* Fill out discipline members. */
sd->sd_wu_size = sizeof(struct sr_crypto_wu);
sd->sd_type = SR_MD_CRYPTO;
strlcpy(sd->sd_name, "CRYPTO", sizeof(sd->sd_name));
sd->sd_capabilities = SR_CAP_SYSTEM_DISK | SR_CAP_AUTO_ASSEMBLE;
sd->sd_max_wu = SR_CRYPTO_NOWU;
for (i = 0; i < SR_CRYPTO_MAXKEYS; i++)
sd->mds.mdd_crypto.scr_sid[i] = (u_int64_t)-1;
/* Setup discipline specific function pointers. */
sd->sd_alloc_resources = sr_crypto_alloc_resources;
sd->sd_assemble = sr_crypto_assemble;
sd->sd_create = sr_crypto_create;
sd->sd_free_resources = sr_crypto_free_resources;
sd->sd_ioctl_handler = sr_crypto_ioctl;
sd->sd_meta_opt_handler = sr_crypto_meta_opt_handler;
sd->sd_scsi_rw = sr_crypto_rw;
sd->sd_scsi_done = sr_crypto_done;
}
int
sr_crypto_create(struct sr_discipline *sd, struct bioc_createraid *bc,
int no_chunk, int64_t coerced_size)
{
struct sr_meta_opt_item *omi;
int rv = EINVAL;
if (no_chunk != 1) {
sr_error(sd->sd_sc, "%s requires exactly one chunk",
sd->sd_name);
goto done;
}
if (coerced_size > SR_CRYPTO_MAXSIZE) {
sr_error(sd->sd_sc, "%s exceeds maximum size (%lli > %llu)",
sd->sd_name, coerced_size, SR_CRYPTO_MAXSIZE);
goto done;
}
/* Create crypto optional metadata. */
omi = malloc(sizeof(struct sr_meta_opt_item), M_DEVBUF,
M_WAITOK | M_ZERO);
omi->omi_som = malloc(sizeof(struct sr_meta_crypto), M_DEVBUF,
M_WAITOK | M_ZERO);
omi->omi_som->som_type = SR_OPT_CRYPTO;
omi->omi_som->som_length = sizeof(struct sr_meta_crypto);
SLIST_INSERT_HEAD(&sd->sd_meta_opt, omi, omi_link);
sd->mds.mdd_crypto.scr_meta = (struct sr_meta_crypto *)omi->omi_som;
sd->sd_meta->ssdi.ssd_opt_no++;
sd->mds.mdd_crypto.key_disk = NULL;
if (bc->bc_key_disk != NODEV) {
/* Create a key disk. */
if (sr_crypto_get_kdf(bc, sd))
goto done;
sd->mds.mdd_crypto.key_disk =
sr_crypto_create_key_disk(sd, bc->bc_key_disk);
if (sd->mds.mdd_crypto.key_disk == NULL)
goto done;
sd->sd_capabilities |= SR_CAP_AUTO_ASSEMBLE;
} else if (bc->bc_opaque_flags & BIOC_SOOUT) {
/* No hint available yet. */
bc->bc_opaque_status = BIOC_SOINOUT_FAILED;
rv = EAGAIN;
goto done;
} else if (sr_crypto_get_kdf(bc, sd))
goto done;
/* Passphrase volumes cannot be automatically assembled. */
if (!(bc->bc_flags & BIOC_SCNOAUTOASSEMBLE) && bc->bc_key_disk == NODEV)
goto done;
sd->sd_meta->ssdi.ssd_size = coerced_size;
sr_crypto_create_keys(sd);
sd->sd_max_ccb_per_wu = no_chunk;
rv = 0;
done:
return (rv);
}
int
sr_crypto_assemble(struct sr_discipline *sd, struct bioc_createraid *bc,
int no_chunk, void *data)
{
int rv = EINVAL;
sd->mds.mdd_crypto.key_disk = NULL;
/* Crypto optional metadata must already exist... */
if (sd->mds.mdd_crypto.scr_meta == NULL)
goto done;
if (data != NULL) {
/* Kernel already has mask key. */
memcpy(sd->mds.mdd_crypto.scr_maskkey, data,
sizeof(sd->mds.mdd_crypto.scr_maskkey));
} else if (bc->bc_key_disk != NODEV) {
/* Read the mask key from the key disk. */
sd->mds.mdd_crypto.key_disk =
sr_crypto_read_key_disk(sd, bc->bc_key_disk);
if (sd->mds.mdd_crypto.key_disk == NULL)
goto done;
} else if (bc->bc_opaque_flags & BIOC_SOOUT) {
/* provide userland with kdf hint */
if (bc->bc_opaque == NULL)
goto done;
if (sizeof(sd->mds.mdd_crypto.scr_meta->scm_kdfhint) <
bc->bc_opaque_size)
goto done;
if (copyout(sd->mds.mdd_crypto.scr_meta->scm_kdfhint,
bc->bc_opaque, bc->bc_opaque_size))
goto done;
/* we're done */
bc->bc_opaque_status = BIOC_SOINOUT_OK;
rv = EAGAIN;
goto done;
} else if (bc->bc_opaque_flags & BIOC_SOIN) {
/* get kdf with maskkey from userland */
if (sr_crypto_get_kdf(bc, sd))
goto done;
} else
goto done;
sd->sd_max_ccb_per_wu = sd->sd_meta->ssdi.ssd_chunk_no;
rv = 0;
done:
return (rv);
}
struct sr_crypto_wu *
sr_crypto_prepare(struct sr_workunit *wu, int encrypt)
{
struct scsi_xfer *xs = wu->swu_xs;
struct sr_discipline *sd = wu->swu_dis;
struct sr_crypto_wu *crwu;
struct cryptodesc *crd;
int flags, i, n;
daddr_t blkno;
u_int keyndx;
DNPRINTF(SR_D_DIS, "%s: sr_crypto_prepare wu %p encrypt %d\n",
DEVNAME(sd->sd_sc), wu, encrypt);
crwu = (struct sr_crypto_wu *)wu;
crwu->cr_uio.uio_iovcnt = 1;
crwu->cr_uio.uio_iov->iov_len = xs->datalen;
if (xs->flags & SCSI_DATA_OUT) {
crwu->cr_uio.uio_iov->iov_base = crwu->cr_dmabuf;
memcpy(crwu->cr_uio.uio_iov->iov_base, xs->data, xs->datalen);
} else
crwu->cr_uio.uio_iov->iov_base = xs->data;
blkno = wu->swu_blk_start;
n = xs->datalen >> DEV_BSHIFT;
/*
* We preallocated enough crypto descs for up to MAXPHYS of I/O.
* Since there may be less than that we need to tweak the amount
* of crypto desc structures to be just long enough for our needs.
*/
KASSERT(crwu->cr_crp->crp_ndescalloc >= n);
crwu->cr_crp->crp_ndesc = n;
flags = (encrypt ? CRD_F_ENCRYPT : 0) |
CRD_F_IV_PRESENT | CRD_F_IV_EXPLICIT;
/*
* Select crypto session based on block number.
*
* XXX - this does not handle the case where the read/write spans
* across a different key blocks (e.g. 0.5TB boundary). Currently
* this is already broken by the use of scr_key[0] below.
*/
keyndx = blkno >> SR_CRYPTO_KEY_BLKSHIFT;
crwu->cr_crp->crp_sid = sd->mds.mdd_crypto.scr_sid[keyndx];
crwu->cr_crp->crp_opaque = crwu;
crwu->cr_crp->crp_ilen = xs->datalen;
crwu->cr_crp->crp_alloctype = M_DEVBUF;
crwu->cr_crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_NOQUEUE;
crwu->cr_crp->crp_buf = &crwu->cr_uio;
for (i = 0; i < crwu->cr_crp->crp_ndesc; i++, blkno++) {
crd = &crwu->cr_crp->crp_desc[i];
crd->crd_skip = i << DEV_BSHIFT;
crd->crd_len = DEV_BSIZE;
crd->crd_inject = 0;
crd->crd_flags = flags;
crd->crd_alg = sd->mds.mdd_crypto.scr_alg;
crd->crd_klen = sd->mds.mdd_crypto.scr_klen;
crd->crd_key = sd->mds.mdd_crypto.scr_key[0];
memcpy(crd->crd_iv, &blkno, sizeof(blkno));
}
return (crwu);
}
int
sr_crypto_get_kdf(struct bioc_createraid *bc, struct sr_discipline *sd)
{
int rv = EINVAL;
struct sr_crypto_kdfinfo *kdfinfo;
if (!(bc->bc_opaque_flags & BIOC_SOIN))
return (rv);
if (bc->bc_opaque == NULL)
return (rv);
if (bc->bc_opaque_size != sizeof(*kdfinfo))
return (rv);
kdfinfo = malloc(bc->bc_opaque_size, M_DEVBUF, M_WAITOK | M_ZERO);
if (copyin(bc->bc_opaque, kdfinfo, bc->bc_opaque_size))
goto out;
if (kdfinfo->len != bc->bc_opaque_size)
goto out;
/* copy KDF hint to disk meta data */
if (kdfinfo->flags & SR_CRYPTOKDF_HINT) {
if (sizeof(sd->mds.mdd_crypto.scr_meta->scm_kdfhint) <
kdfinfo->genkdf.len)
goto out;
memcpy(sd->mds.mdd_crypto.scr_meta->scm_kdfhint,
&kdfinfo->genkdf, kdfinfo->genkdf.len);
}
/* copy mask key to run-time meta data */
if ((kdfinfo->flags & SR_CRYPTOKDF_KEY)) {
if (sizeof(sd->mds.mdd_crypto.scr_maskkey) <
sizeof(kdfinfo->maskkey))
goto out;
memcpy(sd->mds.mdd_crypto.scr_maskkey, &kdfinfo->maskkey,
sizeof(kdfinfo->maskkey));
}
bc->bc_opaque_status = BIOC_SOINOUT_OK;
rv = 0;
out:
explicit_bzero(kdfinfo, bc->bc_opaque_size);
free(kdfinfo, M_DEVBUF, bc->bc_opaque_size);
return (rv);
}
int
sr_crypto_encrypt(u_char *p, u_char *c, u_char *key, size_t size, int alg)
{
rijndael_ctx ctx;
int i, rv = 1;
switch (alg) {
case SR_CRYPTOM_AES_ECB_256:
if (rijndael_set_key_enc_only(&ctx, key, 256) != 0)
goto out;
for (i = 0; i < size; i += RIJNDAEL128_BLOCK_LEN)
rijndael_encrypt(&ctx, &p[i], &c[i]);
rv = 0;
break;
default:
DNPRINTF(SR_D_DIS, "%s: unsupported encryption algorithm %d\n",
"softraid", alg);
rv = -1;
goto out;
}
out:
explicit_bzero(&ctx, sizeof(ctx));
return (rv);
}
int
sr_crypto_decrypt(u_char *c, u_char *p, u_char *key, size_t size, int alg)
{
rijndael_ctx ctx;
int i, rv = 1;
switch (alg) {
case SR_CRYPTOM_AES_ECB_256:
if (rijndael_set_key(&ctx, key, 256) != 0)
goto out;
for (i = 0; i < size; i += RIJNDAEL128_BLOCK_LEN)
rijndael_decrypt(&ctx, &c[i], &p[i]);
rv = 0;
break;
default:
DNPRINTF(SR_D_DIS, "%s: unsupported encryption algorithm %d\n",
"softraid", alg);
rv = -1;
goto out;
}
out:
explicit_bzero(&ctx, sizeof(ctx));
return (rv);
}
void
sr_crypto_calculate_check_hmac_sha1(u_int8_t *maskkey, int maskkey_size,
u_int8_t *key, int key_size, u_char *check_digest)
{
u_char check_key[SHA1_DIGEST_LENGTH];
HMAC_SHA1_CTX hmacctx;
SHA1_CTX shactx;
bzero(check_key, sizeof(check_key));
bzero(&hmacctx, sizeof(hmacctx));
bzero(&shactx, sizeof(shactx));
/* k = SHA1(mask_key) */
SHA1Init(&shactx);
SHA1Update(&shactx, maskkey, maskkey_size);
SHA1Final(check_key, &shactx);
/* mac = HMAC_SHA1_k(unencrypted key) */
HMAC_SHA1_Init(&hmacctx, check_key, sizeof(check_key));
HMAC_SHA1_Update(&hmacctx, key, key_size);
HMAC_SHA1_Final(check_digest, &hmacctx);
explicit_bzero(check_key, sizeof(check_key));
explicit_bzero(&hmacctx, sizeof(hmacctx));
explicit_bzero(&shactx, sizeof(shactx));
}
int
sr_crypto_decrypt_key(struct sr_discipline *sd)
{
u_char check_digest[SHA1_DIGEST_LENGTH];
int rv = 1;
DNPRINTF(SR_D_DIS, "%s: sr_crypto_decrypt_key\n", DEVNAME(sd->sd_sc));
if (sd->mds.mdd_crypto.scr_meta->scm_check_alg != SR_CRYPTOC_HMAC_SHA1)
goto out;
if (sr_crypto_decrypt((u_char *)sd->mds.mdd_crypto.scr_meta->scm_key,
(u_char *)sd->mds.mdd_crypto.scr_key,
sd->mds.mdd_crypto.scr_maskkey, sizeof(sd->mds.mdd_crypto.scr_key),
sd->mds.mdd_crypto.scr_meta->scm_mask_alg) == -1)
goto out;
#ifdef SR_DEBUG0
sr_crypto_dumpkeys(sd);
#endif
/* Check that the key decrypted properly. */
sr_crypto_calculate_check_hmac_sha1(sd->mds.mdd_crypto.scr_maskkey,
sizeof(sd->mds.mdd_crypto.scr_maskkey),
(u_int8_t *)sd->mds.mdd_crypto.scr_key,
sizeof(sd->mds.mdd_crypto.scr_key),
check_digest);
if (memcmp(sd->mds.mdd_crypto.scr_meta->chk_hmac_sha1.sch_mac,
check_digest, sizeof(check_digest)) != 0) {
explicit_bzero(sd->mds.mdd_crypto.scr_key,
sizeof(sd->mds.mdd_crypto.scr_key));
goto out;
}
rv = 0; /* Success */
out:
/* we don't need the mask key anymore */
explicit_bzero(&sd->mds.mdd_crypto.scr_maskkey,
sizeof(sd->mds.mdd_crypto.scr_maskkey));
explicit_bzero(check_digest, sizeof(check_digest));
return rv;
}
int
sr_crypto_create_keys(struct sr_discipline *sd)
{
DNPRINTF(SR_D_DIS, "%s: sr_crypto_create_keys\n",
DEVNAME(sd->sd_sc));
if (AES_MAXKEYBYTES < sizeof(sd->mds.mdd_crypto.scr_maskkey))
return (1);
/* XXX allow user to specify */
sd->mds.mdd_crypto.scr_meta->scm_alg = SR_CRYPTOA_AES_XTS_256;
/* generate crypto keys */
arc4random_buf(sd->mds.mdd_crypto.scr_key,
sizeof(sd->mds.mdd_crypto.scr_key));
/* Mask the disk keys. */
sd->mds.mdd_crypto.scr_meta->scm_mask_alg = SR_CRYPTOM_AES_ECB_256;
sr_crypto_encrypt((u_char *)sd->mds.mdd_crypto.scr_key,
(u_char *)sd->mds.mdd_crypto.scr_meta->scm_key,
sd->mds.mdd_crypto.scr_maskkey, sizeof(sd->mds.mdd_crypto.scr_key),
sd->mds.mdd_crypto.scr_meta->scm_mask_alg);
/* Prepare key decryption check code. */
sd->mds.mdd_crypto.scr_meta->scm_check_alg = SR_CRYPTOC_HMAC_SHA1;
sr_crypto_calculate_check_hmac_sha1(sd->mds.mdd_crypto.scr_maskkey,
sizeof(sd->mds.mdd_crypto.scr_maskkey),
(u_int8_t *)sd->mds.mdd_crypto.scr_key,
sizeof(sd->mds.mdd_crypto.scr_key),
sd->mds.mdd_crypto.scr_meta->chk_hmac_sha1.sch_mac);
/* Erase the plaintext disk keys */
explicit_bzero(sd->mds.mdd_crypto.scr_key,
sizeof(sd->mds.mdd_crypto.scr_key));
#ifdef SR_DEBUG0
sr_crypto_dumpkeys(sd);
#endif
sd->mds.mdd_crypto.scr_meta->scm_flags = SR_CRYPTOF_KEY |
SR_CRYPTOF_KDFHINT;
return (0);
}
int
sr_crypto_change_maskkey(struct sr_discipline *sd,
struct sr_crypto_kdfinfo *kdfinfo1, struct sr_crypto_kdfinfo *kdfinfo2)
{
u_char check_digest[SHA1_DIGEST_LENGTH];
u_char *c, *p = NULL;
size_t ksz;
int rv = 1;
DNPRINTF(SR_D_DIS, "%s: sr_crypto_change_maskkey\n",
DEVNAME(sd->sd_sc));
if (sd->mds.mdd_crypto.scr_meta->scm_check_alg != SR_CRYPTOC_HMAC_SHA1)
goto out;
c = (u_char *)sd->mds.mdd_crypto.scr_meta->scm_key;
ksz = sizeof(sd->mds.mdd_crypto.scr_key);
p = malloc(ksz, M_DEVBUF, M_WAITOK | M_CANFAIL | M_ZERO);
if (p == NULL)
goto out;
if (sr_crypto_decrypt(c, p, kdfinfo1->maskkey, ksz,
sd->mds.mdd_crypto.scr_meta->scm_mask_alg) == -1)
goto out;
#ifdef SR_DEBUG0
sr_crypto_dumpkeys(sd);
#endif
sr_crypto_calculate_check_hmac_sha1(kdfinfo1->maskkey,
sizeof(kdfinfo1->maskkey), p, ksz, check_digest);
if (memcmp(sd->mds.mdd_crypto.scr_meta->chk_hmac_sha1.sch_mac,
check_digest, sizeof(check_digest)) != 0) {
sr_error(sd->sd_sc, "incorrect key or passphrase");
rv = EPERM;
goto out;
}
/* Copy new KDF hint to metadata, if supplied. */
if (kdfinfo2->flags & SR_CRYPTOKDF_HINT) {
if (kdfinfo2->genkdf.len >
sizeof(sd->mds.mdd_crypto.scr_meta->scm_kdfhint))
goto out;
explicit_bzero(sd->mds.mdd_crypto.scr_meta->scm_kdfhint,
sizeof(sd->mds.mdd_crypto.scr_meta->scm_kdfhint));
memcpy(sd->mds.mdd_crypto.scr_meta->scm_kdfhint,
&kdfinfo2->genkdf, kdfinfo2->genkdf.len);
}
/* Mask the disk keys. */
c = (u_char *)sd->mds.mdd_crypto.scr_meta->scm_key;
if (sr_crypto_encrypt(p, c, kdfinfo2->maskkey, ksz,
sd->mds.mdd_crypto.scr_meta->scm_mask_alg) == -1)
goto out;
/* Prepare key decryption check code. */
sd->mds.mdd_crypto.scr_meta->scm_check_alg = SR_CRYPTOC_HMAC_SHA1;
sr_crypto_calculate_check_hmac_sha1(kdfinfo2->maskkey,
sizeof(kdfinfo2->maskkey), (u_int8_t *)sd->mds.mdd_crypto.scr_key,
sizeof(sd->mds.mdd_crypto.scr_key), check_digest);
/* Copy new encrypted key and HMAC to metadata. */
memcpy(sd->mds.mdd_crypto.scr_meta->chk_hmac_sha1.sch_mac, check_digest,
sizeof(sd->mds.mdd_crypto.scr_meta->chk_hmac_sha1.sch_mac));
rv = 0; /* Success */
out:
if (p) {
explicit_bzero(p, ksz);
free(p, M_DEVBUF, ksz);
}
explicit_bzero(check_digest, sizeof(check_digest));
explicit_bzero(&kdfinfo1->maskkey, sizeof(kdfinfo1->maskkey));
explicit_bzero(&kdfinfo2->maskkey, sizeof(kdfinfo2->maskkey));
return (rv);
}
struct sr_chunk *
sr_crypto_create_key_disk(struct sr_discipline *sd, dev_t dev)
{
struct sr_softc *sc = sd->sd_sc;
struct sr_discipline *fakesd = NULL;
struct sr_metadata *sm = NULL;
struct sr_meta_chunk *km;
struct sr_meta_opt_item *omi = NULL;
struct sr_meta_keydisk *skm;
struct sr_chunk *key_disk = NULL;
struct disklabel label;
struct vnode *vn;
char devname[32];
int c, part, open = 0;
/*
* Create a metadata structure on the key disk and store
* keying material in the optional metadata.
*/
sr_meta_getdevname(sc, dev, devname, sizeof(devname));
/* Make sure chunk is not already in use. */
c = sr_chunk_in_use(sc, dev);
if (c != BIOC_SDINVALID && c != BIOC_SDOFFLINE) {
sr_error(sc, "%s is already in use", devname);
goto done;
}
/* Open device. */
if (bdevvp(dev, &vn)) {
sr_error(sc, "cannot open key disk %s", devname);
goto done;
}
if (VOP_OPEN(vn, FREAD | FWRITE, NOCRED, curproc)) {
DNPRINTF(SR_D_META,"%s: sr_crypto_create_key_disk cannot "
"open %s\n", DEVNAME(sc), devname);
vput(vn);
goto done;
}
open = 1; /* close dev on error */
/* Get partition details. */
part = DISKPART(dev);
if (VOP_IOCTL(vn, DIOCGDINFO, (caddr_t)&label,
FREAD, NOCRED, curproc)) {
DNPRINTF(SR_D_META, "%s: sr_crypto_create_key_disk ioctl "
"failed\n", DEVNAME(sc));
goto done;
}
if (label.d_partitions[part].p_fstype != FS_RAID) {
sr_error(sc, "%s partition not of type RAID (%d)",
devname, label.d_partitions[part].p_fstype);
goto done;
}
/*
* Create and populate chunk metadata.
*/
key_disk = malloc(sizeof(struct sr_chunk), M_DEVBUF, M_WAITOK | M_ZERO);
km = &key_disk->src_meta;
key_disk->src_dev_mm = dev;
key_disk->src_vn = vn;
strlcpy(key_disk->src_devname, devname, sizeof(km->scmi.scm_devname));
key_disk->src_size = 0;
km->scmi.scm_volid = sd->sd_meta->ssdi.ssd_level;
km->scmi.scm_chunk_id = 0;
km->scmi.scm_size = 0;
km->scmi.scm_coerced_size = 0;
strlcpy(km->scmi.scm_devname, devname, sizeof(km->scmi.scm_devname));
memcpy(&km->scmi.scm_uuid, &sd->sd_meta->ssdi.ssd_uuid,
sizeof(struct sr_uuid));
sr_checksum(sc, km, &km->scm_checksum,
sizeof(struct sr_meta_chunk_invariant));
km->scm_status = BIOC_SDONLINE;
/*
* Create and populate our own discipline and metadata.
*/
sm = malloc(sizeof(struct sr_metadata), M_DEVBUF, M_WAITOK | M_ZERO);
sm->ssdi.ssd_magic = SR_MAGIC;
sm->ssdi.ssd_version = SR_META_VERSION;
sm->ssd_ondisk = 0;
sm->ssdi.ssd_vol_flags = 0;
memcpy(&sm->ssdi.ssd_uuid, &sd->sd_meta->ssdi.ssd_uuid,
sizeof(struct sr_uuid));
sm->ssdi.ssd_chunk_no = 1;
sm->ssdi.ssd_volid = SR_KEYDISK_VOLID;
sm->ssdi.ssd_level = SR_KEYDISK_LEVEL;
sm->ssdi.ssd_size = 0;
strlcpy(sm->ssdi.ssd_vendor, "OPENBSD", sizeof(sm->ssdi.ssd_vendor));
snprintf(sm->ssdi.ssd_product, sizeof(sm->ssdi.ssd_product),
"SR %s", "KEYDISK");
snprintf(sm->ssdi.ssd_revision, sizeof(sm->ssdi.ssd_revision),
"%03d", SR_META_VERSION);
fakesd = malloc(sizeof(struct sr_discipline), M_DEVBUF,
M_WAITOK | M_ZERO);
fakesd->sd_sc = sd->sd_sc;
fakesd->sd_meta = sm;
fakesd->sd_meta_type = SR_META_F_NATIVE;
fakesd->sd_vol_status = BIOC_SVONLINE;
strlcpy(fakesd->sd_name, "KEYDISK", sizeof(fakesd->sd_name));
SLIST_INIT(&fakesd->sd_meta_opt);
/* Add chunk to volume. */
fakesd->sd_vol.sv_chunks = malloc(sizeof(struct sr_chunk *), M_DEVBUF,
M_WAITOK | M_ZERO);
fakesd->sd_vol.sv_chunks[0] = key_disk;
SLIST_INIT(&fakesd->sd_vol.sv_chunk_list);
SLIST_INSERT_HEAD(&fakesd->sd_vol.sv_chunk_list, key_disk, src_link);
/* Generate mask key. */
arc4random_buf(sd->mds.mdd_crypto.scr_maskkey,
sizeof(sd->mds.mdd_crypto.scr_maskkey));
/* Copy mask key to optional metadata area. */
omi = malloc(sizeof(struct sr_meta_opt_item), M_DEVBUF,
M_WAITOK | M_ZERO);
omi->omi_som = malloc(sizeof(struct sr_meta_keydisk), M_DEVBUF,
M_WAITOK | M_ZERO);
omi->omi_som->som_type = SR_OPT_KEYDISK;
omi->omi_som->som_length = sizeof(struct sr_meta_keydisk);
skm = (struct sr_meta_keydisk *)omi->omi_som;
memcpy(&skm->skm_maskkey, sd->mds.mdd_crypto.scr_maskkey,
sizeof(skm->skm_maskkey));
SLIST_INSERT_HEAD(&fakesd->sd_meta_opt, omi, omi_link);
fakesd->sd_meta->ssdi.ssd_opt_no++;
/* Save metadata. */
if (sr_meta_save(fakesd, SR_META_DIRTY)) {
sr_error(sc, "could not save metadata to %s", devname);
goto fail;
}
goto done;
fail:
free(key_disk, M_DEVBUF, sizeof(struct sr_chunk));
key_disk = NULL;
done:
free(omi, M_DEVBUF, sizeof(struct sr_meta_opt_item));
if (fakesd && fakesd->sd_vol.sv_chunks)
free(fakesd->sd_vol.sv_chunks, M_DEVBUF,
sizeof(struct sr_chunk *));
free(fakesd, M_DEVBUF, sizeof(struct sr_discipline));
free(sm, M_DEVBUF, sizeof(struct sr_metadata));
if (open) {
VOP_CLOSE(vn, FREAD | FWRITE, NOCRED, curproc);
vput(vn);
}
return key_disk;
}
struct sr_chunk *
sr_crypto_read_key_disk(struct sr_discipline *sd, dev_t dev)
{
struct sr_softc *sc = sd->sd_sc;
struct sr_metadata *sm = NULL;
struct sr_meta_opt_item *omi, *omi_next;
struct sr_meta_opt_hdr *omh;
struct sr_meta_keydisk *skm;
struct sr_meta_opt_head som;
struct sr_chunk *key_disk = NULL;
struct disklabel label;
struct vnode *vn = NULL;
char devname[32];
int c, part, open = 0;
/*
* Load a key disk and load keying material into memory.
*/
SLIST_INIT(&som);
sr_meta_getdevname(sc, dev, devname, sizeof(devname));
/* Make sure chunk is not already in use. */
c = sr_chunk_in_use(sc, dev);
if (c != BIOC_SDINVALID && c != BIOC_SDOFFLINE) {
sr_error(sc, "%s is already in use", devname);
goto done;
}
/* Open device. */
if (bdevvp(dev, &vn)) {
sr_error(sc, "cannot open key disk %s", devname);
goto done;
}
if (VOP_OPEN(vn, FREAD, NOCRED, curproc)) {
DNPRINTF(SR_D_META,"%s: sr_crypto_read_key_disk cannot "
"open %s\n", DEVNAME(sc), devname);
vput(vn);
goto done;
}
open = 1; /* close dev on error */
/* Get partition details. */
part = DISKPART(dev);
if (VOP_IOCTL(vn, DIOCGDINFO, (caddr_t)&label, FREAD,
NOCRED, curproc)) {
DNPRINTF(SR_D_META, "%s: sr_crypto_read_key_disk ioctl "
"failed\n", DEVNAME(sc));
goto done;
}
if (label.d_partitions[part].p_fstype != FS_RAID) {
sr_error(sc, "%s partition not of type RAID (%d)",
devname, label.d_partitions[part].p_fstype);
goto done;
}
/*
* Read and validate key disk metadata.
*/
sm = malloc(SR_META_SIZE * DEV_BSIZE, M_DEVBUF, M_WAITOK | M_ZERO);
if (sr_meta_native_read(sd, dev, sm, NULL)) {
sr_error(sc, "native bootprobe could not read native metadata");
goto done;
}
if (sr_meta_validate(sd, dev, sm, NULL)) {
DNPRINTF(SR_D_META, "%s: invalid metadata\n",
DEVNAME(sc));
goto done;
}
/* Make sure this is a key disk. */
if (sm->ssdi.ssd_level != SR_KEYDISK_LEVEL) {
sr_error(sc, "%s is not a key disk", devname);
goto done;
}
/* Construct key disk chunk. */
key_disk = malloc(sizeof(struct sr_chunk), M_DEVBUF, M_WAITOK | M_ZERO);
key_disk->src_dev_mm = dev;
key_disk->src_vn = vn;
key_disk->src_size = 0;
memcpy(&key_disk->src_meta, (struct sr_meta_chunk *)(sm + 1),
sizeof(key_disk->src_meta));
/* Read mask key from optional metadata. */
sr_meta_opt_load(sc, sm, &som);
SLIST_FOREACH(omi, &som, omi_link) {
omh = omi->omi_som;
if (omh->som_type == SR_OPT_KEYDISK) {
skm = (struct sr_meta_keydisk *)omh;
memcpy(sd->mds.mdd_crypto.scr_maskkey, &skm->skm_maskkey,
sizeof(sd->mds.mdd_crypto.scr_maskkey));
} else if (omh->som_type == SR_OPT_CRYPTO) {
/* Original keydisk format with key in crypto area. */
memcpy(sd->mds.mdd_crypto.scr_maskkey,
omh + sizeof(struct sr_meta_opt_hdr),
sizeof(sd->mds.mdd_crypto.scr_maskkey));
}
}
open = 0;
done:
for (omi = SLIST_FIRST(&som); omi != NULL; omi = omi_next) {
omi_next = SLIST_NEXT(omi, omi_link);
free(omi->omi_som, M_DEVBUF, 0);
free(omi, M_DEVBUF, sizeof(struct sr_meta_opt_item));
}
free(sm, M_DEVBUF, SR_META_SIZE * DEV_BSIZE);
if (vn && open) {
VOP_CLOSE(vn, FREAD, NOCRED, curproc);
vput(vn);
}
return key_disk;
}
static void
sr_crypto_free_sessions(struct sr_discipline *sd)
{
u_int i;
for (i = 0; i < SR_CRYPTO_MAXKEYS; i++) {
if (sd->mds.mdd_crypto.scr_sid[i] != (u_int64_t)-1) {
crypto_freesession(sd->mds.mdd_crypto.scr_sid[i]);
sd->mds.mdd_crypto.scr_sid[i] = (u_int64_t)-1;
}
}
}
int
sr_crypto_alloc_resources(struct sr_discipline *sd)
{
struct sr_workunit *wu;
struct sr_crypto_wu *crwu;
struct cryptoini cri;
u_int num_keys, i;
DNPRINTF(SR_D_DIS, "%s: sr_crypto_alloc_resources\n",
DEVNAME(sd->sd_sc));
sd->mds.mdd_crypto.scr_alg = CRYPTO_AES_XTS;
switch (sd->mds.mdd_crypto.scr_meta->scm_alg) {
case SR_CRYPTOA_AES_XTS_128:
sd->mds.mdd_crypto.scr_klen = 256;
break;
case SR_CRYPTOA_AES_XTS_256:
sd->mds.mdd_crypto.scr_klen = 512;
break;
default:
sr_error(sd->sd_sc, "unknown crypto algorithm");
return (EINVAL);
}
for (i = 0; i < SR_CRYPTO_MAXKEYS; i++)
sd->mds.mdd_crypto.scr_sid[i] = (u_int64_t)-1;
if (sr_wu_alloc(sd)) {
sr_error(sd->sd_sc, "unable to allocate work units");
return (ENOMEM);
}
if (sr_ccb_alloc(sd)) {
sr_error(sd->sd_sc, "unable to allocate CCBs");
return (ENOMEM);
}
if (sr_crypto_decrypt_key(sd)) {
sr_error(sd->sd_sc, "incorrect key or passphrase");
return (EPERM);
}
/*
* For each work unit allocate the uio, iovec and crypto structures.
* These have to be allocated now because during runtime we cannot
* fail an allocation without failing the I/O (which can cause real
* problems).
*/
TAILQ_FOREACH(wu, &sd->sd_wu, swu_next) {
crwu = (struct sr_crypto_wu *)wu;
crwu->cr_uio.uio_iov = &crwu->cr_iov;
crwu->cr_dmabuf = dma_alloc(MAXPHYS, PR_WAITOK);
crwu->cr_crp = crypto_getreq(MAXPHYS >> DEV_BSHIFT);
if (crwu->cr_crp == NULL)
return (ENOMEM);
}
memset(&cri, 0, sizeof(cri));
cri.cri_alg = sd->mds.mdd_crypto.scr_alg;
cri.cri_klen = sd->mds.mdd_crypto.scr_klen;
/* Allocate a session for every 2^SR_CRYPTO_KEY_BLKSHIFT blocks. */
num_keys = ((sd->sd_meta->ssdi.ssd_size - 1) >>
SR_CRYPTO_KEY_BLKSHIFT) + 1;
if (num_keys > SR_CRYPTO_MAXKEYS)
return (EFBIG);
for (i = 0; i < num_keys; i++) {
cri.cri_key = sd->mds.mdd_crypto.scr_key[i];
if (crypto_newsession(&sd->mds.mdd_crypto.scr_sid[i],
&cri, 0) != 0) {
sr_crypto_free_sessions(sd);
return (EINVAL);
}
}
sr_hotplug_register(sd, sr_crypto_hotplug);
return (0);
}
void
sr_crypto_free_resources(struct sr_discipline *sd)
{
struct sr_workunit *wu;
struct sr_crypto_wu *crwu;
DNPRINTF(SR_D_DIS, "%s: sr_crypto_free_resources\n",
DEVNAME(sd->sd_sc));
if (sd->mds.mdd_crypto.key_disk != NULL) {
explicit_bzero(sd->mds.mdd_crypto.key_disk,
sizeof(*sd->mds.mdd_crypto.key_disk));
free(sd->mds.mdd_crypto.key_disk, M_DEVBUF,
sizeof(*sd->mds.mdd_crypto.key_disk));
}
sr_hotplug_unregister(sd, sr_crypto_hotplug);
sr_crypto_free_sessions(sd);
TAILQ_FOREACH(wu, &sd->sd_wu, swu_next) {
crwu = (struct sr_crypto_wu *)wu;
if (crwu->cr_dmabuf)
dma_free(crwu->cr_dmabuf, MAXPHYS);
if (crwu->cr_crp)
crypto_freereq(crwu->cr_crp);
}
sr_wu_free(sd);
sr_ccb_free(sd);
}
int
sr_crypto_ioctl(struct sr_discipline *sd, struct bioc_discipline *bd)
{
struct sr_crypto_kdfpair kdfpair;
struct sr_crypto_kdfinfo kdfinfo1, kdfinfo2;
int size, rv = 1;
DNPRINTF(SR_D_IOCTL, "%s: sr_crypto_ioctl %u\n",
DEVNAME(sd->sd_sc), bd->bd_cmd);
switch (bd->bd_cmd) {
case SR_IOCTL_GET_KDFHINT:
/* Get KDF hint for userland. */
size = sizeof(sd->mds.mdd_crypto.scr_meta->scm_kdfhint);
if (bd->bd_data == NULL || bd->bd_size > size)
goto bad;
if (copyout(sd->mds.mdd_crypto.scr_meta->scm_kdfhint,
bd->bd_data, bd->bd_size))
goto bad;
rv = 0;
break;
case SR_IOCTL_CHANGE_PASSPHRASE:
/* Attempt to change passphrase. */
size = sizeof(kdfpair);
if (bd->bd_data == NULL || bd->bd_size > size)
goto bad;
if (copyin(bd->bd_data, &kdfpair, size))
goto bad;
size = sizeof(kdfinfo1);
if (kdfpair.kdfinfo1 == NULL || kdfpair.kdfsize1 > size)
goto bad;
if (copyin(kdfpair.kdfinfo1, &kdfinfo1, size))
goto bad;
size = sizeof(kdfinfo2);
if (kdfpair.kdfinfo2 == NULL || kdfpair.kdfsize2 > size)
goto bad;
if (copyin(kdfpair.kdfinfo2, &kdfinfo2, size))
goto bad;
if (sr_crypto_change_maskkey(sd, &kdfinfo1, &kdfinfo2))
goto bad;
/* Save metadata to disk. */
rv = sr_meta_save(sd, SR_META_DIRTY);
break;
}
bad:
explicit_bzero(&kdfpair, sizeof(kdfpair));
explicit_bzero(&kdfinfo1, sizeof(kdfinfo1));
explicit_bzero(&kdfinfo2, sizeof(kdfinfo2));
return (rv);
}
int
sr_crypto_meta_opt_handler(struct sr_discipline *sd, struct sr_meta_opt_hdr *om)
{
int rv = EINVAL;
if (om->som_type == SR_OPT_CRYPTO) {
sd->mds.mdd_crypto.scr_meta = (struct sr_meta_crypto *)om;
rv = 0;
}
return (rv);
}
int
sr_crypto_rw(struct sr_workunit *wu)
{
struct sr_crypto_wu *crwu;
daddr_t blkno;
int rv = 0;
DNPRINTF(SR_D_DIS, "%s: sr_crypto_rw wu %p\n",
DEVNAME(wu->swu_dis->sd_sc), wu);
if (sr_validate_io(wu, &blkno, "sr_crypto_rw"))
return (1);
if (wu->swu_xs->flags & SCSI_DATA_OUT) {
crwu = sr_crypto_prepare(wu, 1);
crwu->cr_crp->crp_callback = sr_crypto_write;
rv = crypto_dispatch(crwu->cr_crp);
if (rv == 0)
rv = crwu->cr_crp->crp_etype;
} else
rv = sr_crypto_dev_rw(wu, NULL);
return (rv);
}
void
sr_crypto_write(struct cryptop *crp)
{
struct sr_crypto_wu *crwu = crp->crp_opaque;
struct sr_workunit *wu = &crwu->cr_wu;
int s;
DNPRINTF(SR_D_INTR, "%s: sr_crypto_write: wu %p xs: %p\n",
DEVNAME(wu->swu_dis->sd_sc), wu, wu->swu_xs);
if (crp->crp_etype) {
/* fail io */
wu->swu_xs->error = XS_DRIVER_STUFFUP;
s = splbio();
sr_scsi_done(wu->swu_dis, wu->swu_xs);
splx(s);
}
sr_crypto_dev_rw(wu, crwu);
}
int
sr_crypto_dev_rw(struct sr_workunit *wu, struct sr_crypto_wu *crwu)
{
struct sr_discipline *sd = wu->swu_dis;
struct scsi_xfer *xs = wu->swu_xs;
struct sr_ccb *ccb;
struct uio *uio;
daddr_t blkno;
blkno = wu->swu_blk_start;
ccb = sr_ccb_rw(sd, 0, blkno, xs->datalen, xs->data, xs->flags, 0);
if (!ccb) {
/* should never happen but handle more gracefully */
printf("%s: %s: too many ccbs queued\n",
DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname);
goto bad;
}
if (!ISSET(xs->flags, SCSI_DATA_IN)) {
uio = crwu->cr_crp->crp_buf;
ccb->ccb_buf.b_data = uio->uio_iov->iov_base;
ccb->ccb_opaque = crwu;
}
sr_wu_enqueue_ccb(wu, ccb);
sr_schedule_wu(wu);
return (0);
bad:
/* wu is unwound by sr_wu_put */
if (crwu)
crwu->cr_crp->crp_etype = EINVAL;
return (1);
}
void
sr_crypto_done(struct sr_workunit *wu)
{
struct scsi_xfer *xs = wu->swu_xs;
struct sr_crypto_wu *crwu;
int s;
/* If this was a successful read, initiate decryption of the data. */
if (ISSET(xs->flags, SCSI_DATA_IN) && xs->error == XS_NOERROR) {
crwu = sr_crypto_prepare(wu, 0);
crwu->cr_crp->crp_callback = sr_crypto_read;
DNPRINTF(SR_D_INTR, "%s: sr_crypto_done: crypto_dispatch %p\n",
DEVNAME(wu->swu_dis->sd_sc), crwu->cr_crp);
crypto_dispatch(crwu->cr_crp);
return;
}
s = splbio();
sr_scsi_done(wu->swu_dis, wu->swu_xs);
splx(s);
}
void
sr_crypto_read(struct cryptop *crp)
{
struct sr_crypto_wu *crwu = crp->crp_opaque;
struct sr_workunit *wu = &crwu->cr_wu;
int s;
DNPRINTF(SR_D_INTR, "%s: sr_crypto_read: wu %p xs: %p\n",
DEVNAME(wu->swu_dis->sd_sc), wu, wu->swu_xs);
if (crp->crp_etype)
wu->swu_xs->error = XS_DRIVER_STUFFUP;
s = splbio();
sr_scsi_done(wu->swu_dis, wu->swu_xs);
splx(s);
}
void
sr_crypto_hotplug(struct sr_discipline *sd, struct disk *diskp, int action)
{
DNPRINTF(SR_D_MISC, "%s: sr_crypto_hotplug: %s %d\n",
DEVNAME(sd->sd_sc), diskp->dk_name, action);
}
#ifdef SR_DEBUG0
void
sr_crypto_dumpkeys(struct sr_discipline *sd)
{
int i, j;
printf("sr_crypto_dumpkeys:\n");
for (i = 0; i < SR_CRYPTO_MAXKEYS; i++) {
printf("\tscm_key[%d]: 0x", i);
for (j = 0; j < SR_CRYPTO_KEYBYTES; j++) {
printf("%02x",
sd->mds.mdd_crypto.scr_meta->scm_key[i][j]);
}
printf("\n");
}
printf("sr_crypto_dumpkeys: runtime data keys:\n");
for (i = 0; i < SR_CRYPTO_MAXKEYS; i++) {
printf("\tscr_key[%d]: 0x", i);
for (j = 0; j < SR_CRYPTO_KEYBYTES; j++) {
printf("%02x",
sd->mds.mdd_crypto.scr_key[i][j]);
}
printf("\n");
}
}
#endif /* SR_DEBUG */