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Native Encryption for ZFS on Linux

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This change incorporates three major pieces:

The first change is a keystore that manages wrapping
and encryption keys for encrypted datasets. These
commands mostly involve manipulating the new
DSL Crypto Key ZAP Objects that live in the MOS. Each
encrypted dataset has its own DSL Crypto Key that is
protected with a user's key. This level of indirection
allows users to change their keys without re-encrypting
their entire datasets. The change implements the new
subcommands "zfs load-key", "zfs unload-key" and
"zfs change-key" which allow the user to manage their
encryption keys and settings. In addition, several new
flags and properties have been added to allow dataset
creation and to make mounting and unmounting more
convenient.

The second piece of this patch provides the ability to
encrypt, decyrpt, and authenticate protected datasets.
Each object set maintains a Merkel tree of Message
Authentication Codes that protect the lower layers,
similarly to how checksums are maintained. This part
impacts the zio layer, which handles the actual
encryption and generation of MACs, as well as the ARC
and DMU, which need to be able to handle encrypted
buffers and protected data.

The last addition is the ability to do raw, encrypted
sends and receives. The idea here is to send raw
encrypted and compressed data and receive it exactly
as is on a backup system. This means that the dataset
on the receiving system is protected using the same
user key that is in use on the sending side. By doing
so, datasets can be efficiently backed up to an
untrusted system without fear of data being
compromised.

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #494 
Closes #5769
This commit is contained in:
Tom Caputi
2017-08-14 13:36:48 -04:00
committed by Brian Behlendorf
parent 376994828f
commit b525630342
163 changed files with 16091 additions and 1204 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/zio_impl.h
+34 -18
View File
@@ -96,6 +96,18 @@ extern "C" {
* physical I/O. The nop write feature can handle writes in either
* syncing or open context (i.e. zil writes) and as a result is mutually
* exclusive with dedup.
*
* Encryption:
* Encryption and authentication is handled by the ZIO_STAGE_ENCRYPT stage.
* This stage determines how the encryption metadata is stored in the bp.
* Decryption and MAC verification is performed during zio_decrypt() as a
* transform callback. Encryption is mutually exclusive with nopwrite, because
* blocks with the same plaintext will be encrypted with different salts and
* IV's (if dedup is off), and therefore have different ciphertexts. For dedup
* blocks we deterministically generate the IV and salt by performing an HMAC
* of the plaintext, which is computationally expensive, but allows us to keep
* support for encrypted dedup. See the block comment in zio_crypt.c for
* details.
*/
/*
@@ -110,32 +122,33 @@ enum zio_stage {
ZIO_STAGE_ISSUE_ASYNC = 1 << 4, /* RWF-- */
ZIO_STAGE_WRITE_COMPRESS = 1 << 5, /* -W--- */
ZIO_STAGE_CHECKSUM_GENERATE = 1 << 6, /* -W--- */
ZIO_STAGE_ENCRYPT = 1 << 6, /* -W--- */
ZIO_STAGE_CHECKSUM_GENERATE = 1 << 7, /* -W--- */
ZIO_STAGE_NOP_WRITE = 1 << 7, /* -W--- */
ZIO_STAGE_NOP_WRITE = 1 << 8, /* -W--- */
ZIO_STAGE_DDT_READ_START = 1 << 8, /* R---- */
ZIO_STAGE_DDT_READ_DONE = 1 << 9, /* R---- */
ZIO_STAGE_DDT_WRITE = 1 << 10, /* -W--- */
ZIO_STAGE_DDT_FREE = 1 << 11, /* --F-- */
ZIO_STAGE_DDT_READ_START = 1 << 9, /* R---- */
ZIO_STAGE_DDT_READ_DONE = 1 << 10, /* R---- */
ZIO_STAGE_DDT_WRITE = 1 << 11, /* -W--- */
ZIO_STAGE_DDT_FREE = 1 << 12, /* --F-- */
ZIO_STAGE_GANG_ASSEMBLE = 1 << 12, /* RWFC- */
ZIO_STAGE_GANG_ISSUE = 1 << 13, /* RWFC- */
ZIO_STAGE_GANG_ASSEMBLE = 1 << 13, /* RWFC- */
ZIO_STAGE_GANG_ISSUE = 1 << 14, /* RWFC- */
ZIO_STAGE_DVA_THROTTLE = 1 << 14, /* -W--- */
ZIO_STAGE_DVA_ALLOCATE = 1 << 15, /* -W--- */
ZIO_STAGE_DVA_FREE = 1 << 16, /* --F-- */
ZIO_STAGE_DVA_CLAIM = 1 << 17, /* ---C- */
ZIO_STAGE_DVA_THROTTLE = 1 << 15, /* -W--- */
ZIO_STAGE_DVA_ALLOCATE = 1 << 16, /* -W--- */
ZIO_STAGE_DVA_FREE = 1 << 17, /* --F-- */
ZIO_STAGE_DVA_CLAIM = 1 << 18, /* ---C- */
ZIO_STAGE_READY = 1 << 18, /* RWFCI */
ZIO_STAGE_READY = 1 << 19, /* RWFCI */
ZIO_STAGE_VDEV_IO_START = 1 << 19, /* RW--I */
ZIO_STAGE_VDEV_IO_DONE = 1 << 20, /* RW--I */
ZIO_STAGE_VDEV_IO_ASSESS = 1 << 21, /* RW--I */
ZIO_STAGE_VDEV_IO_START = 1 << 20, /* RW--I */
ZIO_STAGE_VDEV_IO_DONE = 1 << 21, /* RW--I */
ZIO_STAGE_VDEV_IO_ASSESS = 1 << 22, /* RW--I */
ZIO_STAGE_CHECKSUM_VERIFY = 1 << 22, /* R---- */
ZIO_STAGE_CHECKSUM_VERIFY = 1 << 23, /* R---- */
ZIO_STAGE_DONE = 1 << 23 /* RWFCI */
ZIO_STAGE_DONE = 1 << 24 /* RWFCI */
};
#define ZIO_INTERLOCK_STAGES \
@@ -187,12 +200,14 @@ enum zio_stage {
#define ZIO_REWRITE_PIPELINE \
(ZIO_WRITE_COMMON_STAGES | \
ZIO_STAGE_WRITE_COMPRESS | \
ZIO_STAGE_ENCRYPT | \
ZIO_STAGE_WRITE_BP_INIT)
#define ZIO_WRITE_PIPELINE \
(ZIO_WRITE_COMMON_STAGES | \
ZIO_STAGE_WRITE_BP_INIT | \
ZIO_STAGE_WRITE_COMPRESS | \
ZIO_STAGE_ENCRYPT | \
ZIO_STAGE_DVA_THROTTLE | \
ZIO_STAGE_DVA_ALLOCATE)
@@ -207,6 +222,7 @@ enum zio_stage {
ZIO_STAGE_WRITE_BP_INIT | \
ZIO_STAGE_ISSUE_ASYNC | \
ZIO_STAGE_WRITE_COMPRESS | \
ZIO_STAGE_ENCRYPT | \
ZIO_STAGE_CHECKSUM_GENERATE | \
ZIO_STAGE_DDT_WRITE)