mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
4637429e39
Instead of using token pasting to generate methods for each superblock section, just make the type a parameter to bch2_sb_field_get(). Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
805 lines
18 KiB
C
805 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include "bcachefs.h"
|
|
#include "checksum.h"
|
|
#include "errcode.h"
|
|
#include "super.h"
|
|
#include "super-io.h"
|
|
|
|
#include <linux/crc32c.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/xxhash.h>
|
|
#include <linux/key.h>
|
|
#include <linux/random.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/chacha.h>
|
|
#include <crypto/hash.h>
|
|
#include <crypto/poly1305.h>
|
|
#include <crypto/skcipher.h>
|
|
#include <keys/user-type.h>
|
|
|
|
/*
|
|
* bch2_checksum state is an abstraction of the checksum state calculated over different pages.
|
|
* it features page merging without having the checksum algorithm lose its state.
|
|
* for native checksum aglorithms (like crc), a default seed value will do.
|
|
* for hash-like algorithms, a state needs to be stored
|
|
*/
|
|
|
|
struct bch2_checksum_state {
|
|
union {
|
|
u64 seed;
|
|
struct xxh64_state h64state;
|
|
};
|
|
unsigned int type;
|
|
};
|
|
|
|
static void bch2_checksum_init(struct bch2_checksum_state *state)
|
|
{
|
|
switch (state->type) {
|
|
case BCH_CSUM_none:
|
|
case BCH_CSUM_crc32c:
|
|
case BCH_CSUM_crc64:
|
|
state->seed = 0;
|
|
break;
|
|
case BCH_CSUM_crc32c_nonzero:
|
|
state->seed = U32_MAX;
|
|
break;
|
|
case BCH_CSUM_crc64_nonzero:
|
|
state->seed = U64_MAX;
|
|
break;
|
|
case BCH_CSUM_xxhash:
|
|
xxh64_reset(&state->h64state, 0);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static u64 bch2_checksum_final(const struct bch2_checksum_state *state)
|
|
{
|
|
switch (state->type) {
|
|
case BCH_CSUM_none:
|
|
case BCH_CSUM_crc32c:
|
|
case BCH_CSUM_crc64:
|
|
return state->seed;
|
|
case BCH_CSUM_crc32c_nonzero:
|
|
return state->seed ^ U32_MAX;
|
|
case BCH_CSUM_crc64_nonzero:
|
|
return state->seed ^ U64_MAX;
|
|
case BCH_CSUM_xxhash:
|
|
return xxh64_digest(&state->h64state);
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static void bch2_checksum_update(struct bch2_checksum_state *state, const void *data, size_t len)
|
|
{
|
|
switch (state->type) {
|
|
case BCH_CSUM_none:
|
|
return;
|
|
case BCH_CSUM_crc32c_nonzero:
|
|
case BCH_CSUM_crc32c:
|
|
state->seed = crc32c(state->seed, data, len);
|
|
break;
|
|
case BCH_CSUM_crc64_nonzero:
|
|
case BCH_CSUM_crc64:
|
|
state->seed = crc64_be(state->seed, data, len);
|
|
break;
|
|
case BCH_CSUM_xxhash:
|
|
xxh64_update(&state->h64state, data, len);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static inline int do_encrypt_sg(struct crypto_sync_skcipher *tfm,
|
|
struct nonce nonce,
|
|
struct scatterlist *sg, size_t len)
|
|
{
|
|
SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm);
|
|
int ret;
|
|
|
|
skcipher_request_set_sync_tfm(req, tfm);
|
|
skcipher_request_set_crypt(req, sg, sg, len, nonce.d);
|
|
|
|
ret = crypto_skcipher_encrypt(req);
|
|
if (ret)
|
|
pr_err("got error %i from crypto_skcipher_encrypt()", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int do_encrypt(struct crypto_sync_skcipher *tfm,
|
|
struct nonce nonce,
|
|
void *buf, size_t len)
|
|
{
|
|
if (!is_vmalloc_addr(buf)) {
|
|
struct scatterlist sg;
|
|
|
|
sg_init_table(&sg, 1);
|
|
sg_set_page(&sg,
|
|
is_vmalloc_addr(buf)
|
|
? vmalloc_to_page(buf)
|
|
: virt_to_page(buf),
|
|
len, offset_in_page(buf));
|
|
return do_encrypt_sg(tfm, nonce, &sg, len);
|
|
} else {
|
|
unsigned pages = buf_pages(buf, len);
|
|
struct scatterlist *sg;
|
|
size_t orig_len = len;
|
|
int ret, i;
|
|
|
|
sg = kmalloc_array(pages, sizeof(*sg), GFP_KERNEL);
|
|
if (!sg)
|
|
return -BCH_ERR_ENOMEM_do_encrypt;
|
|
|
|
sg_init_table(sg, pages);
|
|
|
|
for (i = 0; i < pages; i++) {
|
|
unsigned offset = offset_in_page(buf);
|
|
unsigned pg_len = min_t(size_t, len, PAGE_SIZE - offset);
|
|
|
|
sg_set_page(sg + i, vmalloc_to_page(buf), pg_len, offset);
|
|
buf += pg_len;
|
|
len -= pg_len;
|
|
}
|
|
|
|
ret = do_encrypt_sg(tfm, nonce, sg, orig_len);
|
|
kfree(sg);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
int bch2_chacha_encrypt_key(struct bch_key *key, struct nonce nonce,
|
|
void *buf, size_t len)
|
|
{
|
|
struct crypto_sync_skcipher *chacha20 =
|
|
crypto_alloc_sync_skcipher("chacha20", 0, 0);
|
|
int ret;
|
|
|
|
ret = PTR_ERR_OR_ZERO(chacha20);
|
|
if (ret) {
|
|
pr_err("error requesting chacha20 cipher: %s", bch2_err_str(ret));
|
|
return ret;
|
|
}
|
|
|
|
ret = crypto_skcipher_setkey(&chacha20->base,
|
|
(void *) key, sizeof(*key));
|
|
if (ret) {
|
|
pr_err("error from crypto_skcipher_setkey(): %s", bch2_err_str(ret));
|
|
goto err;
|
|
}
|
|
|
|
ret = do_encrypt(chacha20, nonce, buf, len);
|
|
err:
|
|
crypto_free_sync_skcipher(chacha20);
|
|
return ret;
|
|
}
|
|
|
|
static int gen_poly_key(struct bch_fs *c, struct shash_desc *desc,
|
|
struct nonce nonce)
|
|
{
|
|
u8 key[POLY1305_KEY_SIZE];
|
|
int ret;
|
|
|
|
nonce.d[3] ^= BCH_NONCE_POLY;
|
|
|
|
memset(key, 0, sizeof(key));
|
|
ret = do_encrypt(c->chacha20, nonce, key, sizeof(key));
|
|
if (ret)
|
|
return ret;
|
|
|
|
desc->tfm = c->poly1305;
|
|
crypto_shash_init(desc);
|
|
crypto_shash_update(desc, key, sizeof(key));
|
|
return 0;
|
|
}
|
|
|
|
struct bch_csum bch2_checksum(struct bch_fs *c, unsigned type,
|
|
struct nonce nonce, const void *data, size_t len)
|
|
{
|
|
switch (type) {
|
|
case BCH_CSUM_none:
|
|
case BCH_CSUM_crc32c_nonzero:
|
|
case BCH_CSUM_crc64_nonzero:
|
|
case BCH_CSUM_crc32c:
|
|
case BCH_CSUM_xxhash:
|
|
case BCH_CSUM_crc64: {
|
|
struct bch2_checksum_state state;
|
|
|
|
state.type = type;
|
|
|
|
bch2_checksum_init(&state);
|
|
bch2_checksum_update(&state, data, len);
|
|
|
|
return (struct bch_csum) { .lo = cpu_to_le64(bch2_checksum_final(&state)) };
|
|
}
|
|
|
|
case BCH_CSUM_chacha20_poly1305_80:
|
|
case BCH_CSUM_chacha20_poly1305_128: {
|
|
SHASH_DESC_ON_STACK(desc, c->poly1305);
|
|
u8 digest[POLY1305_DIGEST_SIZE];
|
|
struct bch_csum ret = { 0 };
|
|
|
|
gen_poly_key(c, desc, nonce);
|
|
|
|
crypto_shash_update(desc, data, len);
|
|
crypto_shash_final(desc, digest);
|
|
|
|
memcpy(&ret, digest, bch_crc_bytes[type]);
|
|
return ret;
|
|
}
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
int bch2_encrypt(struct bch_fs *c, unsigned type,
|
|
struct nonce nonce, void *data, size_t len)
|
|
{
|
|
if (!bch2_csum_type_is_encryption(type))
|
|
return 0;
|
|
|
|
return do_encrypt(c->chacha20, nonce, data, len);
|
|
}
|
|
|
|
static struct bch_csum __bch2_checksum_bio(struct bch_fs *c, unsigned type,
|
|
struct nonce nonce, struct bio *bio,
|
|
struct bvec_iter *iter)
|
|
{
|
|
struct bio_vec bv;
|
|
|
|
switch (type) {
|
|
case BCH_CSUM_none:
|
|
return (struct bch_csum) { 0 };
|
|
case BCH_CSUM_crc32c_nonzero:
|
|
case BCH_CSUM_crc64_nonzero:
|
|
case BCH_CSUM_crc32c:
|
|
case BCH_CSUM_xxhash:
|
|
case BCH_CSUM_crc64: {
|
|
struct bch2_checksum_state state;
|
|
|
|
state.type = type;
|
|
bch2_checksum_init(&state);
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
__bio_for_each_segment(bv, bio, *iter, *iter) {
|
|
void *p = kmap_local_page(bv.bv_page) + bv.bv_offset;
|
|
|
|
bch2_checksum_update(&state, p, bv.bv_len);
|
|
kunmap_local(p);
|
|
}
|
|
#else
|
|
__bio_for_each_bvec(bv, bio, *iter, *iter)
|
|
bch2_checksum_update(&state, page_address(bv.bv_page) + bv.bv_offset,
|
|
bv.bv_len);
|
|
#endif
|
|
return (struct bch_csum) { .lo = cpu_to_le64(bch2_checksum_final(&state)) };
|
|
}
|
|
|
|
case BCH_CSUM_chacha20_poly1305_80:
|
|
case BCH_CSUM_chacha20_poly1305_128: {
|
|
SHASH_DESC_ON_STACK(desc, c->poly1305);
|
|
u8 digest[POLY1305_DIGEST_SIZE];
|
|
struct bch_csum ret = { 0 };
|
|
|
|
gen_poly_key(c, desc, nonce);
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
__bio_for_each_segment(bv, bio, *iter, *iter) {
|
|
void *p = kmap_local_page(bv.bv_page) + bv.bv_offset;
|
|
|
|
crypto_shash_update(desc, p, bv.bv_len);
|
|
kunmap_local(p);
|
|
}
|
|
#else
|
|
__bio_for_each_bvec(bv, bio, *iter, *iter)
|
|
crypto_shash_update(desc,
|
|
page_address(bv.bv_page) + bv.bv_offset,
|
|
bv.bv_len);
|
|
#endif
|
|
crypto_shash_final(desc, digest);
|
|
|
|
memcpy(&ret, digest, bch_crc_bytes[type]);
|
|
return ret;
|
|
}
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
struct bch_csum bch2_checksum_bio(struct bch_fs *c, unsigned type,
|
|
struct nonce nonce, struct bio *bio)
|
|
{
|
|
struct bvec_iter iter = bio->bi_iter;
|
|
|
|
return __bch2_checksum_bio(c, type, nonce, bio, &iter);
|
|
}
|
|
|
|
int __bch2_encrypt_bio(struct bch_fs *c, unsigned type,
|
|
struct nonce nonce, struct bio *bio)
|
|
{
|
|
struct bio_vec bv;
|
|
struct bvec_iter iter;
|
|
struct scatterlist sgl[16], *sg = sgl;
|
|
size_t bytes = 0;
|
|
int ret = 0;
|
|
|
|
if (!bch2_csum_type_is_encryption(type))
|
|
return 0;
|
|
|
|
sg_init_table(sgl, ARRAY_SIZE(sgl));
|
|
|
|
bio_for_each_segment(bv, bio, iter) {
|
|
if (sg == sgl + ARRAY_SIZE(sgl)) {
|
|
sg_mark_end(sg - 1);
|
|
|
|
ret = do_encrypt_sg(c->chacha20, nonce, sgl, bytes);
|
|
if (ret)
|
|
return ret;
|
|
|
|
nonce = nonce_add(nonce, bytes);
|
|
bytes = 0;
|
|
|
|
sg_init_table(sgl, ARRAY_SIZE(sgl));
|
|
sg = sgl;
|
|
}
|
|
|
|
sg_set_page(sg++, bv.bv_page, bv.bv_len, bv.bv_offset);
|
|
bytes += bv.bv_len;
|
|
}
|
|
|
|
sg_mark_end(sg - 1);
|
|
return do_encrypt_sg(c->chacha20, nonce, sgl, bytes);
|
|
}
|
|
|
|
struct bch_csum bch2_checksum_merge(unsigned type, struct bch_csum a,
|
|
struct bch_csum b, size_t b_len)
|
|
{
|
|
struct bch2_checksum_state state;
|
|
|
|
state.type = type;
|
|
bch2_checksum_init(&state);
|
|
state.seed = le64_to_cpu(a.lo);
|
|
|
|
BUG_ON(!bch2_checksum_mergeable(type));
|
|
|
|
while (b_len) {
|
|
unsigned page_len = min_t(unsigned, b_len, PAGE_SIZE);
|
|
|
|
bch2_checksum_update(&state,
|
|
page_address(ZERO_PAGE(0)), page_len);
|
|
b_len -= page_len;
|
|
}
|
|
a.lo = cpu_to_le64(bch2_checksum_final(&state));
|
|
a.lo ^= b.lo;
|
|
a.hi ^= b.hi;
|
|
return a;
|
|
}
|
|
|
|
int bch2_rechecksum_bio(struct bch_fs *c, struct bio *bio,
|
|
struct bversion version,
|
|
struct bch_extent_crc_unpacked crc_old,
|
|
struct bch_extent_crc_unpacked *crc_a,
|
|
struct bch_extent_crc_unpacked *crc_b,
|
|
unsigned len_a, unsigned len_b,
|
|
unsigned new_csum_type)
|
|
{
|
|
struct bvec_iter iter = bio->bi_iter;
|
|
struct nonce nonce = extent_nonce(version, crc_old);
|
|
struct bch_csum merged = { 0 };
|
|
struct crc_split {
|
|
struct bch_extent_crc_unpacked *crc;
|
|
unsigned len;
|
|
unsigned csum_type;
|
|
struct bch_csum csum;
|
|
} splits[3] = {
|
|
{ crc_a, len_a, new_csum_type, { 0 }},
|
|
{ crc_b, len_b, new_csum_type, { 0 } },
|
|
{ NULL, bio_sectors(bio) - len_a - len_b, new_csum_type, { 0 } },
|
|
}, *i;
|
|
bool mergeable = crc_old.csum_type == new_csum_type &&
|
|
bch2_checksum_mergeable(new_csum_type);
|
|
unsigned crc_nonce = crc_old.nonce;
|
|
|
|
BUG_ON(len_a + len_b > bio_sectors(bio));
|
|
BUG_ON(crc_old.uncompressed_size != bio_sectors(bio));
|
|
BUG_ON(crc_is_compressed(crc_old));
|
|
BUG_ON(bch2_csum_type_is_encryption(crc_old.csum_type) !=
|
|
bch2_csum_type_is_encryption(new_csum_type));
|
|
|
|
for (i = splits; i < splits + ARRAY_SIZE(splits); i++) {
|
|
iter.bi_size = i->len << 9;
|
|
if (mergeable || i->crc)
|
|
i->csum = __bch2_checksum_bio(c, i->csum_type,
|
|
nonce, bio, &iter);
|
|
else
|
|
bio_advance_iter(bio, &iter, i->len << 9);
|
|
nonce = nonce_add(nonce, i->len << 9);
|
|
}
|
|
|
|
if (mergeable)
|
|
for (i = splits; i < splits + ARRAY_SIZE(splits); i++)
|
|
merged = bch2_checksum_merge(new_csum_type, merged,
|
|
i->csum, i->len << 9);
|
|
else
|
|
merged = bch2_checksum_bio(c, crc_old.csum_type,
|
|
extent_nonce(version, crc_old), bio);
|
|
|
|
if (bch2_crc_cmp(merged, crc_old.csum) && !c->opts.no_data_io) {
|
|
bch_err(c, "checksum error in %s() (memory corruption or bug?)\n"
|
|
"expected %0llx:%0llx got %0llx:%0llx (old type %s new type %s)",
|
|
__func__,
|
|
crc_old.csum.hi,
|
|
crc_old.csum.lo,
|
|
merged.hi,
|
|
merged.lo,
|
|
bch2_csum_types[crc_old.csum_type],
|
|
bch2_csum_types[new_csum_type]);
|
|
return -EIO;
|
|
}
|
|
|
|
for (i = splits; i < splits + ARRAY_SIZE(splits); i++) {
|
|
if (i->crc)
|
|
*i->crc = (struct bch_extent_crc_unpacked) {
|
|
.csum_type = i->csum_type,
|
|
.compression_type = crc_old.compression_type,
|
|
.compressed_size = i->len,
|
|
.uncompressed_size = i->len,
|
|
.offset = 0,
|
|
.live_size = i->len,
|
|
.nonce = crc_nonce,
|
|
.csum = i->csum,
|
|
};
|
|
|
|
if (bch2_csum_type_is_encryption(new_csum_type))
|
|
crc_nonce += i->len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* BCH_SB_FIELD_crypt: */
|
|
|
|
static int bch2_sb_crypt_validate(struct bch_sb *sb,
|
|
struct bch_sb_field *f,
|
|
struct printbuf *err)
|
|
{
|
|
struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
|
|
|
|
if (vstruct_bytes(&crypt->field) < sizeof(*crypt)) {
|
|
prt_printf(err, "wrong size (got %zu should be %zu)",
|
|
vstruct_bytes(&crypt->field), sizeof(*crypt));
|
|
return -BCH_ERR_invalid_sb_crypt;
|
|
}
|
|
|
|
if (BCH_CRYPT_KDF_TYPE(crypt)) {
|
|
prt_printf(err, "bad kdf type %llu", BCH_CRYPT_KDF_TYPE(crypt));
|
|
return -BCH_ERR_invalid_sb_crypt;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bch2_sb_crypt_to_text(struct printbuf *out, struct bch_sb *sb,
|
|
struct bch_sb_field *f)
|
|
{
|
|
struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
|
|
|
|
prt_printf(out, "KFD: %llu", BCH_CRYPT_KDF_TYPE(crypt));
|
|
prt_newline(out);
|
|
prt_printf(out, "scrypt n: %llu", BCH_KDF_SCRYPT_N(crypt));
|
|
prt_newline(out);
|
|
prt_printf(out, "scrypt r: %llu", BCH_KDF_SCRYPT_R(crypt));
|
|
prt_newline(out);
|
|
prt_printf(out, "scrypt p: %llu", BCH_KDF_SCRYPT_P(crypt));
|
|
prt_newline(out);
|
|
}
|
|
|
|
const struct bch_sb_field_ops bch_sb_field_ops_crypt = {
|
|
.validate = bch2_sb_crypt_validate,
|
|
.to_text = bch2_sb_crypt_to_text,
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
static int __bch2_request_key(char *key_description, struct bch_key *key)
|
|
{
|
|
struct key *keyring_key;
|
|
const struct user_key_payload *ukp;
|
|
int ret;
|
|
|
|
keyring_key = request_key(&key_type_user, key_description, NULL);
|
|
if (IS_ERR(keyring_key))
|
|
return PTR_ERR(keyring_key);
|
|
|
|
down_read(&keyring_key->sem);
|
|
ukp = dereference_key_locked(keyring_key);
|
|
if (ukp->datalen == sizeof(*key)) {
|
|
memcpy(key, ukp->data, ukp->datalen);
|
|
ret = 0;
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
up_read(&keyring_key->sem);
|
|
key_put(keyring_key);
|
|
|
|
return ret;
|
|
}
|
|
#else
|
|
#include <keyutils.h>
|
|
|
|
static int __bch2_request_key(char *key_description, struct bch_key *key)
|
|
{
|
|
key_serial_t key_id;
|
|
|
|
key_id = request_key("user", key_description, NULL,
|
|
KEY_SPEC_SESSION_KEYRING);
|
|
if (key_id >= 0)
|
|
goto got_key;
|
|
|
|
key_id = request_key("user", key_description, NULL,
|
|
KEY_SPEC_USER_KEYRING);
|
|
if (key_id >= 0)
|
|
goto got_key;
|
|
|
|
key_id = request_key("user", key_description, NULL,
|
|
KEY_SPEC_USER_SESSION_KEYRING);
|
|
if (key_id >= 0)
|
|
goto got_key;
|
|
|
|
return -errno;
|
|
got_key:
|
|
|
|
if (keyctl_read(key_id, (void *) key, sizeof(*key)) != sizeof(*key))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include "../crypto.h"
|
|
#endif
|
|
|
|
int bch2_request_key(struct bch_sb *sb, struct bch_key *key)
|
|
{
|
|
struct printbuf key_description = PRINTBUF;
|
|
int ret;
|
|
|
|
prt_printf(&key_description, "bcachefs:");
|
|
pr_uuid(&key_description, sb->user_uuid.b);
|
|
|
|
ret = __bch2_request_key(key_description.buf, key);
|
|
printbuf_exit(&key_description);
|
|
|
|
#ifndef __KERNEL__
|
|
if (ret) {
|
|
char *passphrase = read_passphrase("Enter passphrase: ");
|
|
struct bch_encrypted_key sb_key;
|
|
|
|
bch2_passphrase_check(sb, passphrase,
|
|
key, &sb_key);
|
|
ret = 0;
|
|
}
|
|
#endif
|
|
|
|
/* stash with memfd, pass memfd fd to mount */
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifndef __KERNEL__
|
|
int bch2_revoke_key(struct bch_sb *sb)
|
|
{
|
|
key_serial_t key_id;
|
|
struct printbuf key_description = PRINTBUF;
|
|
|
|
prt_printf(&key_description, "bcachefs:");
|
|
pr_uuid(&key_description, sb->user_uuid.b);
|
|
|
|
key_id = request_key("user", key_description.buf, NULL, KEY_SPEC_USER_KEYRING);
|
|
printbuf_exit(&key_description);
|
|
if (key_id < 0)
|
|
return errno;
|
|
|
|
keyctl_revoke(key_id);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int bch2_decrypt_sb_key(struct bch_fs *c,
|
|
struct bch_sb_field_crypt *crypt,
|
|
struct bch_key *key)
|
|
{
|
|
struct bch_encrypted_key sb_key = crypt->key;
|
|
struct bch_key user_key;
|
|
int ret = 0;
|
|
|
|
/* is key encrypted? */
|
|
if (!bch2_key_is_encrypted(&sb_key))
|
|
goto out;
|
|
|
|
ret = bch2_request_key(c->disk_sb.sb, &user_key);
|
|
if (ret) {
|
|
bch_err(c, "error requesting encryption key: %s", bch2_err_str(ret));
|
|
goto err;
|
|
}
|
|
|
|
/* decrypt real key: */
|
|
ret = bch2_chacha_encrypt_key(&user_key, bch2_sb_key_nonce(c),
|
|
&sb_key, sizeof(sb_key));
|
|
if (ret)
|
|
goto err;
|
|
|
|
if (bch2_key_is_encrypted(&sb_key)) {
|
|
bch_err(c, "incorrect encryption key");
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
out:
|
|
*key = sb_key.key;
|
|
err:
|
|
memzero_explicit(&sb_key, sizeof(sb_key));
|
|
memzero_explicit(&user_key, sizeof(user_key));
|
|
return ret;
|
|
}
|
|
|
|
static int bch2_alloc_ciphers(struct bch_fs *c)
|
|
{
|
|
int ret;
|
|
|
|
if (!c->chacha20)
|
|
c->chacha20 = crypto_alloc_sync_skcipher("chacha20", 0, 0);
|
|
ret = PTR_ERR_OR_ZERO(c->chacha20);
|
|
|
|
if (ret) {
|
|
bch_err(c, "error requesting chacha20 module: %s", bch2_err_str(ret));
|
|
return ret;
|
|
}
|
|
|
|
if (!c->poly1305)
|
|
c->poly1305 = crypto_alloc_shash("poly1305", 0, 0);
|
|
ret = PTR_ERR_OR_ZERO(c->poly1305);
|
|
|
|
if (ret) {
|
|
bch_err(c, "error requesting poly1305 module: %s", bch2_err_str(ret));
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bch2_disable_encryption(struct bch_fs *c)
|
|
{
|
|
struct bch_sb_field_crypt *crypt;
|
|
struct bch_key key;
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&c->sb_lock);
|
|
|
|
crypt = bch2_sb_field_get(c->disk_sb.sb, crypt);
|
|
if (!crypt)
|
|
goto out;
|
|
|
|
/* is key encrypted? */
|
|
ret = 0;
|
|
if (bch2_key_is_encrypted(&crypt->key))
|
|
goto out;
|
|
|
|
ret = bch2_decrypt_sb_key(c, crypt, &key);
|
|
if (ret)
|
|
goto out;
|
|
|
|
crypt->key.magic = cpu_to_le64(BCH_KEY_MAGIC);
|
|
crypt->key.key = key;
|
|
|
|
SET_BCH_SB_ENCRYPTION_TYPE(c->disk_sb.sb, 0);
|
|
bch2_write_super(c);
|
|
out:
|
|
mutex_unlock(&c->sb_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bch2_enable_encryption(struct bch_fs *c, bool keyed)
|
|
{
|
|
struct bch_encrypted_key key;
|
|
struct bch_key user_key;
|
|
struct bch_sb_field_crypt *crypt;
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&c->sb_lock);
|
|
|
|
/* Do we already have an encryption key? */
|
|
if (bch2_sb_field_get(c->disk_sb.sb, crypt))
|
|
goto err;
|
|
|
|
ret = bch2_alloc_ciphers(c);
|
|
if (ret)
|
|
goto err;
|
|
|
|
key.magic = cpu_to_le64(BCH_KEY_MAGIC);
|
|
get_random_bytes(&key.key, sizeof(key.key));
|
|
|
|
if (keyed) {
|
|
ret = bch2_request_key(c->disk_sb.sb, &user_key);
|
|
if (ret) {
|
|
bch_err(c, "error requesting encryption key: %s", bch2_err_str(ret));
|
|
goto err;
|
|
}
|
|
|
|
ret = bch2_chacha_encrypt_key(&user_key, bch2_sb_key_nonce(c),
|
|
&key, sizeof(key));
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
ret = crypto_skcipher_setkey(&c->chacha20->base,
|
|
(void *) &key.key, sizeof(key.key));
|
|
if (ret)
|
|
goto err;
|
|
|
|
crypt = bch2_sb_field_resize(&c->disk_sb, crypt,
|
|
sizeof(*crypt) / sizeof(u64));
|
|
if (!crypt) {
|
|
ret = -BCH_ERR_ENOSPC_sb_crypt;
|
|
goto err;
|
|
}
|
|
|
|
crypt->key = key;
|
|
|
|
/* write superblock */
|
|
SET_BCH_SB_ENCRYPTION_TYPE(c->disk_sb.sb, 1);
|
|
bch2_write_super(c);
|
|
err:
|
|
mutex_unlock(&c->sb_lock);
|
|
memzero_explicit(&user_key, sizeof(user_key));
|
|
memzero_explicit(&key, sizeof(key));
|
|
return ret;
|
|
}
|
|
|
|
void bch2_fs_encryption_exit(struct bch_fs *c)
|
|
{
|
|
if (!IS_ERR_OR_NULL(c->poly1305))
|
|
crypto_free_shash(c->poly1305);
|
|
if (!IS_ERR_OR_NULL(c->chacha20))
|
|
crypto_free_sync_skcipher(c->chacha20);
|
|
if (!IS_ERR_OR_NULL(c->sha256))
|
|
crypto_free_shash(c->sha256);
|
|
}
|
|
|
|
int bch2_fs_encryption_init(struct bch_fs *c)
|
|
{
|
|
struct bch_sb_field_crypt *crypt;
|
|
struct bch_key key;
|
|
int ret = 0;
|
|
|
|
c->sha256 = crypto_alloc_shash("sha256", 0, 0);
|
|
ret = PTR_ERR_OR_ZERO(c->sha256);
|
|
if (ret) {
|
|
bch_err(c, "error requesting sha256 module: %s", bch2_err_str(ret));
|
|
goto out;
|
|
}
|
|
|
|
crypt = bch2_sb_field_get(c->disk_sb.sb, crypt);
|
|
if (!crypt)
|
|
goto out;
|
|
|
|
ret = bch2_alloc_ciphers(c);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = bch2_decrypt_sb_key(c, crypt, &key);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = crypto_skcipher_setkey(&c->chacha20->base,
|
|
(void *) &key.key, sizeof(key.key));
|
|
if (ret)
|
|
goto out;
|
|
out:
|
|
memzero_explicit(&key, sizeof(key));
|
|
return ret;
|
|
}
|