Native Encryption for ZFS on Linux

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 <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Jorgen Lundman <[email protected]>
Signed-off-by: Tom Caputi <[email protected]>
Closes #494 
Closes #5769 

1 files changed, 33 insertions, 6 deletions

diff --git a/man/man8/zpool.8 b/man/man8/zpool.8
index 5814b4125..232d14db5 100644
--- a/man/man8/zpool.8
+++ b/man/man8/zpool.8
@@ -92,7 +92,7 @@
 .Nm
 .Cm import
 .Fl a
-.Op Fl DfmN
+.Op Fl DflmN
 .Op Fl F Oo Fl n Oc Oo Fl T Oc Oo Fl X Oc
 .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir
 .Op Fl o Ar mntopts
@@ -100,7 +100,7 @@
 .Op Fl R Ar root
 .Nm
 .Cm import
-.Op Fl Dfm
+.Op Fl Dflm
 .Op Fl F Oo Fl n Oc Oo Fl T Oc Oo Fl X Oc
 .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir
 .Op Fl o Ar mntopts
@@ -160,7 +160,7 @@
 .Ar pool
 .Nm
 .Cm split
-.Op Fl gLnP
+.Op Fl gLlnP
 .Oo Fl o Ar property Ns = Ns Ar value Oc Ns ...
 .Op Fl R Ar root
 .Ar pool newpool
@@ -1186,7 +1186,7 @@ Lists destroyed pools only.
 .Nm
 .Cm import
 .Fl a
-.Op Fl DfmN
+.Op Fl DflmN
 .Op Fl F Oo Fl n Oc Oo Fl T Oc Oo Fl X Oc
 .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir
 .Op Fl o Ar mntopts
@@ -1237,6 +1237,15 @@ transactions.
 Not all damaged pools can be recovered by using this option.
 If successful, the data from the discarded transactions is irretrievably lost.
 This option is ignored if the pool is importable or already imported.
+.It Fl l
+Indicates that this command will request encryption keys for all encrypted
+datasets it attempts to mount as it is bringing the pool online. Note that if
+any datasets have a
+.Sy keylocation
+of
+.Sy prompt
+this command will block waiting for the keys to be entered. Without this flag
+encrypted datasets will be left unavailable until the keys are loaded.
 .It Fl m
 Allows a pool to import when there is a missing log device.
 Recent transactions can be lost because the log device will be discarded.
@@ -1298,7 +1307,7 @@ health of your pool and should only be used as a last resort.
 .It Xo
 .Nm
 .Cm import
-.Op Fl Dfm
+.Op Fl Dflm
 .Op Fl F Oo Fl n Oc Oo Fl t Oc Oo Fl T Oc Oo Fl X Oc
 .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir
 .Op Fl o Ar mntopts
@@ -1357,6 +1366,15 @@ transactions.
 Not all damaged pools can be recovered by using this option.
 If successful, the data from the discarded transactions is irretrievably lost.
 This option is ignored if the pool is importable or already imported.
+.It Fl l
+Indicates that this command will request encryption keys for all encrypted
+datasets it attempts to mount as it is bringing the pool online. Note that if
+any datasets have a
+.Sy keylocation
+of
+.Sy prompt
+this command will block waiting for the keys to be entered. Without this flag
+encrypted datasets will be left unavailable until the keys are loaded.
 .It Fl m
 Allows a pool to import when there is a missing log device.
 Recent transactions can be lost because the log device will be discarded.
@@ -1849,7 +1867,7 @@ values.
 .It Xo
 .Nm
 .Cm split
-.Op Fl gLnP
+.Op Fl gLlnP
 .Oo Fl o Ar property Ns = Ns Ar value Oc Ns ...
 .Op Fl R Ar root
 .Ar pool newpool
@@ -1887,6 +1905,15 @@ Display real paths for vdevs resolving all symbolic links. This can
 be used to look up the current block device name regardless of the
 .Pa /dev/disk/
 path used to open it.
+.It Fl l
+Indicates that this command will request encryption keys for all encrypted
+datasets it attempts to mount as it is bringing the new pool online. Note that
+if any datasets have a
+.Sy keylocation
+of
+.Sy prompt
+this command will block waiting for the keys to be entered. Without this flag
+encrypted datasets will be left unavailable until the keys are loaded.
 .It Fl n
 Do dry run, do not actually perform the split.
 Print out the expected configuration of