Merge pull request #131118 from etu/sanoid-syncoid-improvements

nixos/{syncoid,sanoid}: Improve ZFS permission delegation
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Elis Hirwing 2021-07-26 11:40:51 +02:00 committed by GitHub
commit 699ea65439
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6 changed files with 363 additions and 299 deletions

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@ -702,6 +702,19 @@
option.
</para>
</listitem>
<listitem>
<para>
The
<link xlink:href="options.html#opt-services.syncoid.enable">services.syncoid.enable</link>
module now properly drops ZFS permissions after usage. Before
it delegated permissions to whole pools instead of datasets
and didnt clean up after execution. You can manually look
this up for your pools by running
<literal>zfs allow your-pool-name</literal> and use
<literal>zfs unallow syncoid your-pool-name</literal> to clean
this up.
</para>
</listitem>
</itemizedlist>
</section>
</section>

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@ -183,3 +183,5 @@ pt-services.clipcat.enable).
- NSS modules which should come after `dns` should use mkAfter.
- The [networking.wireless.iwd](options.html#opt-networking.wireless.iwd.enable) module has a new [networking.wireless.iwd.settings](options.html#opt-networking.wireless.iwd.settings) option.
- The [services.syncoid.enable](options.html#opt-services.syncoid.enable) module now properly drops ZFS permissions after usage. Before it delegated permissions to whole pools instead of datasets and didn't clean up after execution. You can manually look this up for your pools by running `zfs allow your-pool-name` and use `zfs unallow syncoid your-pool-name` to clean this up.

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@ -52,7 +52,7 @@ let
use_template = mkOption {
description = "Names of the templates to use for this dataset.";
type = types.listOf (types.enum (attrNames cfg.templates));
default = [];
default = [ ];
};
useTemplate = use_template;
@ -70,116 +70,127 @@ let
processChildrenOnly = process_children_only;
};
# Extract pool names from configured datasets
pools = unique (map (d: head (builtins.match "([^/]+).*" d)) (attrNames cfg.datasets));
# Extract unique dataset names
datasets = unique (attrNames cfg.datasets);
configFile = let
mkValueString = v:
if builtins.isList v then concatStringsSep "," v
else generators.mkValueStringDefault {} v;
# Function to build "zfs allow" and "zfs unallow" commands for the
# filesystems we've delegated permissions to.
buildAllowCommand = zfsAction: permissions: dataset: lib.escapeShellArgs [
# Here we explicitly use the booted system to guarantee the stable API needed by ZFS
"-+/run/booted-system/sw/bin/zfs"
zfsAction
"sanoid"
(concatStringsSep "," permissions)
dataset
];
mkKeyValue = k: v: if v == null then ""
else if k == "processChildrenOnly" then ""
else if k == "useTemplate" then ""
else generators.mkKeyValueDefault { inherit mkValueString; } "=" k v;
in generators.toINI { inherit mkKeyValue; } cfg.settings;
configFile =
let
mkValueString = v:
if builtins.isList v then concatStringsSep "," v
else generators.mkValueStringDefault { } v;
in {
mkKeyValue = k: v:
if v == null then ""
else if k == "processChildrenOnly" then ""
else if k == "useTemplate" then ""
else generators.mkKeyValueDefault { inherit mkValueString; } "=" k v;
in
generators.toINI { inherit mkKeyValue; } cfg.settings;
# Interface
in
{
options.services.sanoid = {
enable = mkEnableOption "Sanoid ZFS snapshotting service";
# Interface
interval = mkOption {
type = types.str;
default = "hourly";
example = "daily";
description = ''
Run sanoid at this interval. The default is to run hourly.
options.services.sanoid = {
enable = mkEnableOption "Sanoid ZFS snapshotting service";
The format is described in
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>.
'';
};
interval = mkOption {
type = types.str;
default = "hourly";
example = "daily";
description = ''
Run sanoid at this interval. The default is to run hourly.
datasets = mkOption {
type = types.attrsOf (types.submodule ({config, options, ...}: {
freeformType = datasetSettingsType;
options = commonOptions // datasetOptions;
config.use_template = mkAliasDefinitions (mkDefault options.useTemplate or {});
config.process_children_only = mkAliasDefinitions (mkDefault options.processChildrenOnly or {});
}));
default = {};
description = "Datasets to snapshot.";
};
templates = mkOption {
type = types.attrsOf (types.submodule {
freeformType = datasetSettingsType;
options = commonOptions;
});
default = {};
description = "Templates for datasets.";
};
settings = mkOption {
type = types.attrsOf datasetSettingsType;
description = ''
Free-form settings written directly to the config file. See
<link xlink:href="https://github.com/jimsalterjrs/sanoid/blob/master/sanoid.defaults.conf"/>
for allowed values.
'';
};
extraArgs = mkOption {
type = types.listOf types.str;
default = [];
example = [ "--verbose" "--readonly" "--debug" ];
description = ''
Extra arguments to pass to sanoid. See
<link xlink:href="https://github.com/jimsalterjrs/sanoid/#sanoid-command-line-options"/>
for allowed options.
'';
};
The format is described in
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>.
'';
};
# Implementation
config = mkIf cfg.enable {
services.sanoid.settings = mkMerge [
(mapAttrs' (d: v: nameValuePair ("template_" + d) v) cfg.templates)
(mapAttrs (d: v: v) cfg.datasets)
];
systemd.services.sanoid = {
description = "Sanoid snapshot service";
serviceConfig = {
ExecStartPre = map (pool: lib.escapeShellArgs [
"+/run/booted-system/sw/bin/zfs" "allow"
"sanoid" "snapshot,mount,destroy" pool
]) pools;
ExecStart = lib.escapeShellArgs ([
"${pkgs.sanoid}/bin/sanoid"
"--cron"
"--configdir" (pkgs.writeTextDir "sanoid.conf" configFile)
] ++ cfg.extraArgs);
ExecStopPost = map (pool: lib.escapeShellArgs [
"+/run/booted-system/sw/bin/zfs" "unallow" "sanoid" pool
]) pools;
User = "sanoid";
Group = "sanoid";
DynamicUser = true;
RuntimeDirectory = "sanoid";
CacheDirectory = "sanoid";
};
# Prevents missing snapshots during DST changes
environment.TZ = "UTC";
after = [ "zfs.target" ];
startAt = cfg.interval;
};
datasets = mkOption {
type = types.attrsOf (types.submodule ({ config, options, ... }: {
freeformType = datasetSettingsType;
options = commonOptions // datasetOptions;
config.use_template = mkAliasDefinitions (mkDefault options.useTemplate or { });
config.process_children_only = mkAliasDefinitions (mkDefault options.processChildrenOnly or { });
}));
default = { };
description = "Datasets to snapshot.";
};
meta.maintainers = with maintainers; [ lopsided98 ];
}
templates = mkOption {
type = types.attrsOf (types.submodule {
freeformType = datasetSettingsType;
options = commonOptions;
});
default = { };
description = "Templates for datasets.";
};
settings = mkOption {
type = types.attrsOf datasetSettingsType;
description = ''
Free-form settings written directly to the config file. See
<link xlink:href="https://github.com/jimsalterjrs/sanoid/blob/master/sanoid.defaults.conf"/>
for allowed values.
'';
};
extraArgs = mkOption {
type = types.listOf types.str;
default = [ ];
example = [ "--verbose" "--readonly" "--debug" ];
description = ''
Extra arguments to pass to sanoid. See
<link xlink:href="https://github.com/jimsalterjrs/sanoid/#sanoid-command-line-options"/>
for allowed options.
'';
};
};
# Implementation
config = mkIf cfg.enable {
services.sanoid.settings = mkMerge [
(mapAttrs' (d: v: nameValuePair ("template_" + d) v) cfg.templates)
(mapAttrs (d: v: v) cfg.datasets)
];
systemd.services.sanoid = {
description = "Sanoid snapshot service";
serviceConfig = {
ExecStartPre = (map (buildAllowCommand "allow" [ "snapshot" "mount" "destroy" ]) datasets);
ExecStopPost = (map (buildAllowCommand "unallow" [ "snapshot" "mount" "destroy" ]) datasets);
ExecStart = lib.escapeShellArgs ([
"${pkgs.sanoid}/bin/sanoid"
"--cron"
"--configdir"
(pkgs.writeTextDir "sanoid.conf" configFile)
] ++ cfg.extraArgs);
User = "sanoid";
Group = "sanoid";
DynamicUser = true;
RuntimeDirectory = "sanoid";
CacheDirectory = "sanoid";
};
# Prevents missing snapshots during DST changes
environment.TZ = "UTC";
after = [ "zfs.target" ];
startAt = cfg.interval;
};
};
meta.maintainers = with maintainers; [ lopsided98 ];
}

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@ -5,226 +5,243 @@ with lib;
let
cfg = config.services.syncoid;
# Extract the pool name of a local dataset (any dataset not containing "@")
localPoolName = d: optionals (d != null) (
let m = builtins.match "([^/@]+)[^@]*" d; in
optionals (m != null) m);
# Extract local dasaset names (so no datasets containing "@")
localDatasetName = d: optionals (d != null) (
let m = builtins.match "([^/@]+[^@]*)" d; in
optionals (m != null) m
);
# Escape as required by: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
escapeUnitName = name:
lib.concatMapStrings (s: if lib.isList s then "-" else s)
(builtins.split "[^a-zA-Z0-9_.\\-]+" name);
in {
(builtins.split "[^a-zA-Z0-9_.\\-]+" name);
# Interface
# Function to build "zfs allow" and "zfs unallow" commands for the
# filesystems we've delegated permissions to.
buildAllowCommand = zfsAction: permissions: dataset: lib.escapeShellArgs [
# Here we explicitly use the booted system to guarantee the stable API needed by ZFS
"-+/run/booted-system/sw/bin/zfs"
zfsAction
cfg.user
(concatStringsSep "," permissions)
dataset
];
in
{
options.services.syncoid = {
enable = mkEnableOption "Syncoid ZFS synchronization service";
# Interface
interval = mkOption {
type = types.str;
default = "hourly";
example = "*-*-* *:15:00";
description = ''
Run syncoid at this interval. The default is to run hourly.
options.services.syncoid = {
enable = mkEnableOption "Syncoid ZFS synchronization service";
The format is described in
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>.
'';
};
interval = mkOption {
type = types.str;
default = "hourly";
example = "*-*-* *:15:00";
description = ''
Run syncoid at this interval. The default is to run hourly.
user = mkOption {
type = types.str;
default = "syncoid";
example = "backup";
description = ''
The user for the service. ZFS privilege delegation will be
automatically configured for any local pools used by syncoid if this
option is set to a user other than root. The user will be given the
"hold" and "send" privileges on any pool that has datasets being sent
and the "create", "mount", "receive", and "rollback" privileges on
any pool that has datasets being received.
'';
};
The format is described in
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>.
'';
};
group = mkOption {
type = types.str;
default = "syncoid";
example = "backup";
description = "The group for the service.";
};
user = mkOption {
type = types.str;
default = "syncoid";
example = "backup";
description = ''
The user for the service. ZFS privilege delegation will be
automatically configured for any local pools used by syncoid if this
option is set to a user other than root. The user will be given the
"hold" and "send" privileges on any pool that has datasets being sent
and the "create", "mount", "receive", and "rollback" privileges on
any pool that has datasets being received.
'';
};
sshKey = mkOption {
type = types.nullOr types.path;
# Prevent key from being copied to store
apply = mapNullable toString;
default = null;
description = ''
SSH private key file to use to login to the remote system. Can be
overridden in individual commands.
'';
};
group = mkOption {
type = types.str;
default = "syncoid";
example = "backup";
description = "The group for the service.";
};
commonArgs = mkOption {
type = types.listOf types.str;
default = [];
example = [ "--no-sync-snap" ];
description = ''
Arguments to add to every syncoid command, unless disabled for that
command. See
<link xlink:href="https://github.com/jimsalterjrs/sanoid/#syncoid-command-line-options"/>
for available options.
'';
};
sshKey = mkOption {
type = types.nullOr types.path;
# Prevent key from being copied to store
apply = mapNullable toString;
default = null;
description = ''
SSH private key file to use to login to the remote system. Can be
overridden in individual commands.
'';
};
service = mkOption {
type = types.attrs;
default = {};
description = ''
Systemd configuration common to all syncoid services.
'';
};
commonArgs = mkOption {
type = types.listOf types.str;
default = [ ];
example = [ "--no-sync-snap" ];
description = ''
Arguments to add to every syncoid command, unless disabled for that
command. See
<link xlink:href="https://github.com/jimsalterjrs/sanoid/#syncoid-command-line-options"/>
for available options.
'';
};
commands = mkOption {
type = types.attrsOf (types.submodule ({ name, ... }: {
options = {
source = mkOption {
type = types.str;
example = "pool/dataset";
description = ''
Source ZFS dataset. Can be either local or remote. Defaults to
the attribute name.
'';
};
service = mkOption {
type = types.attrs;
default = { };
description = ''
Systemd configuration common to all syncoid services.
'';
};
target = mkOption {
type = types.str;
example = "user@server:pool/dataset";
description = ''
Target ZFS dataset. Can be either local
(<replaceable>pool/dataset</replaceable>) or remote
(<replaceable>user@server:pool/dataset</replaceable>).
'';
};
recursive = mkEnableOption ''the transfer of child datasets'';
sshKey = mkOption {
type = types.nullOr types.path;
# Prevent key from being copied to store
apply = mapNullable toString;
description = ''
SSH private key file to use to login to the remote system.
Defaults to <option>services.syncoid.sshKey</option> option.
'';
};
sendOptions = mkOption {
type = types.separatedString " ";
default = "";
example = "Lc e";
description = ''
Advanced options to pass to zfs send. Options are specified
without their leading dashes and separated by spaces.
'';
};
recvOptions = mkOption {
type = types.separatedString " ";
default = "";
example = "ux recordsize o compression=lz4";
description = ''
Advanced options to pass to zfs recv. Options are specified
without their leading dashes and separated by spaces.
'';
};
useCommonArgs = mkOption {
type = types.bool;
default = true;
description = ''
Whether to add the configured common arguments to this command.
'';
};
service = mkOption {
type = types.attrs;
default = {};
description = ''
Systemd configuration specific to this syncoid service.
'';
};
extraArgs = mkOption {
type = types.listOf types.str;
default = [];
example = [ "--sshport 2222" ];
description = "Extra syncoid arguments for this command.";
};
commands = mkOption {
type = types.attrsOf (types.submodule ({ name, ... }: {
options = {
source = mkOption {
type = types.str;
example = "pool/dataset";
description = ''
Source ZFS dataset. Can be either local or remote. Defaults to
the attribute name.
'';
};
config = {
source = mkDefault name;
sshKey = mkDefault cfg.sshKey;
target = mkOption {
type = types.str;
example = "user@server:pool/dataset";
description = ''
Target ZFS dataset. Can be either local
(<replaceable>pool/dataset</replaceable>) or remote
(<replaceable>user@server:pool/dataset</replaceable>).
'';
};
}));
default = {};
example = literalExample ''
{
"pool/test".target = "root@target:pool/test";
}
'';
description = "Syncoid commands to run.";
recursive = mkEnableOption ''the transfer of child datasets'';
sshKey = mkOption {
type = types.nullOr types.path;
# Prevent key from being copied to store
apply = mapNullable toString;
description = ''
SSH private key file to use to login to the remote system.
Defaults to <option>services.syncoid.sshKey</option> option.
'';
};
sendOptions = mkOption {
type = types.separatedString " ";
default = "";
example = "Lc e";
description = ''
Advanced options to pass to zfs send. Options are specified
without their leading dashes and separated by spaces.
'';
};
recvOptions = mkOption {
type = types.separatedString " ";
default = "";
example = "ux recordsize o compression=lz4";
description = ''
Advanced options to pass to zfs recv. Options are specified
without their leading dashes and separated by spaces.
'';
};
useCommonArgs = mkOption {
type = types.bool;
default = true;
description = ''
Whether to add the configured common arguments to this command.
'';
};
service = mkOption {
type = types.attrs;
default = { };
description = ''
Systemd configuration specific to this syncoid service.
'';
};
extraArgs = mkOption {
type = types.listOf types.str;
default = [ ];
example = [ "--sshport 2222" ];
description = "Extra syncoid arguments for this command.";
};
};
config = {
source = mkDefault name;
sshKey = mkDefault cfg.sshKey;
};
}));
default = { };
example = literalExample ''
{
"pool/test".target = "root@target:pool/test";
}
'';
description = "Syncoid commands to run.";
};
};
# Implementation
config = mkIf cfg.enable {
users = {
users = mkIf (cfg.user == "syncoid") {
syncoid = {
group = cfg.group;
isSystemUser = true;
# For syncoid to be able to create /var/lib/syncoid/.ssh/
# and to use custom ssh_config or known_hosts.
home = "/var/lib/syncoid";
createHome = false;
};
};
groups = mkIf (cfg.group == "syncoid") {
syncoid = { };
};
};
# Implementation
config = mkIf cfg.enable {
users = {
users = mkIf (cfg.user == "syncoid") {
syncoid = {
group = cfg.group;
isSystemUser = true;
# For syncoid to be able to create /var/lib/syncoid/.ssh/
# and to use custom ssh_config or known_hosts.
home = "/var/lib/syncoid";
createHome = false;
};
};
groups = mkIf (cfg.group == "syncoid") {
syncoid = {};
};
};
systemd.services = mapAttrs' (name: c:
systemd.services = mapAttrs'
(name: c:
nameValuePair "syncoid-${escapeUnitName name}" (mkMerge [
{ description = "Syncoid ZFS synchronization from ${c.source} to ${c.target}";
{
description = "Syncoid ZFS synchronization from ${c.source} to ${c.target}";
after = [ "zfs.target" ];
startAt = cfg.interval;
# syncoid may need zpool to get feature@extensible_dataset
path = [ "/run/booted-system/sw/bin/" ];
serviceConfig = {
ExecStartPre =
map (pool: lib.escapeShellArgs [
"+/run/booted-system/sw/bin/zfs" "allow"
cfg.user "bookmark,hold,send,snapshot,destroy" pool
# Permissions snapshot and destroy are in case --no-sync-snap is not used
]) (localPoolName c.source) ++
map (pool: lib.escapeShellArgs [
"+/run/booted-system/sw/bin/zfs" "allow"
cfg.user "create,mount,receive,rollback" pool
]) (localPoolName c.target);
# Permissions snapshot and destroy are in case --no-sync-snap is not used
(map (buildAllowCommand "allow" [ "bookmark" "hold" "send" "snapshot" "destroy" ]) (localDatasetName c.source)) ++
(map (buildAllowCommand "allow" [ "create" "mount" "receive" "rollback" ]) (localDatasetName c.target));
ExecStopPost =
# Permissions snapshot and destroy are in case --no-sync-snap is not used
(map (buildAllowCommand "unallow" [ "bookmark" "hold" "send" "snapshot" "destroy" ]) (localDatasetName c.source)) ++
(map (buildAllowCommand "unallow" [ "create" "mount" "receive" "rollback" ]) (localDatasetName c.target));
ExecStart = lib.escapeShellArgs ([ "${pkgs.sanoid}/bin/syncoid" ]
++ optionals c.useCommonArgs cfg.commonArgs
++ optional c.recursive "-r"
++ optionals (c.sshKey != null) [ "--sshkey" c.sshKey ]
++ c.extraArgs
++ [ "--sendoptions" c.sendOptions
"--recvoptions" c.recvOptions
"--no-privilege-elevation"
c.source c.target
]);
++ [
"--sendoptions"
c.sendOptions
"--recvoptions"
c.recvOptions
"--no-privilege-elevation"
c.source
c.target
]);
User = cfg.user;
Group = cfg.group;
StateDirectory = [ "syncoid" ];
@ -240,7 +257,7 @@ in {
# systemd-analyze security | grep syncoid-'*'
AmbientCapabilities = "";
CapabilityBoundingSet = "";
DeviceAllow = ["/dev/zfs"];
DeviceAllow = [ "/dev/zfs" ];
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
@ -266,7 +283,7 @@ in {
BindPaths = [ "/dev/zfs" ];
BindReadOnlyPaths = [ builtins.storeDir "/etc" "/run" "/bin/sh" ];
# Avoid useless mounting of RootDirectory= in the own RootDirectory= of ExecStart='s mount namespace.
InaccessiblePaths = ["-+/run/syncoid/${escapeUnitName name}"];
InaccessiblePaths = [ "-+/run/syncoid/${escapeUnitName name}" ];
MountAPIVFS = true;
# Create RootDirectory= in the host's mount namespace.
RuntimeDirectory = [ "syncoid/${escapeUnitName name}" ];
@ -277,8 +294,14 @@ in {
# perf stat -x, 2>perf.log -e 'syscalls:sys_enter_*' syncoid …
# awk >perf.syscalls -F "," '$1 > 0 {sub("syscalls:sys_enter_","",$3); print $3}' perf.log
# systemd-analyze syscall-filter | grep -v -e '#' | sed -e ':loop; /^[^ ]/N; s/\n //; t loop' | grep $(printf ' -e \\<%s\\>' $(cat perf.syscalls)) | cut -f 1 -d ' '
"~@aio" "~@chown" "~@keyring" "~@memlock" "~@privileged"
"~@resources" "~@setuid" "~@sync" "~@timer"
"~@aio"
"~@chown"
"~@keyring"
"~@memlock"
"~@privileged"
"~@resources"
"~@setuid"
"~@timer"
];
SystemCallArchitectures = "native";
# This is for BindPaths= and BindReadOnlyPaths=
@ -288,8 +311,9 @@ in {
}
cfg.service
c.service
])) cfg.commands;
};
]))
cfg.commands;
};
meta.maintainers = with maintainers; [ julm lopsided98 ];
}
meta.maintainers = with maintainers; [ julm lopsided98 ];
}

View file

@ -85,10 +85,18 @@ in {
"chown -R syncoid:syncoid /var/lib/syncoid/",
)
assert len(source.succeed("zfs allow pool")) == 0, "Pool shouldn't have delegated permissions set before snapshotting"
assert len(source.succeed("zfs allow pool/sanoid")) == 0, "Sanoid dataset shouldn't have delegated permissions set before snapshotting"
assert len(source.succeed("zfs allow pool/syncoid")) == 0, "Syncoid dataset shouldn't have delegated permissions set before snapshotting"
# Take snapshot with sanoid
source.succeed("touch /mnt/pool/sanoid/test.txt")
source.systemctl("start --wait sanoid.service")
assert len(source.succeed("zfs allow pool")) == 0, "Pool shouldn't have delegated permissions set after snapshotting"
assert len(source.succeed("zfs allow pool/sanoid")) == 0, "Sanoid dataset shouldn't have delegated permissions set after snapshotting"
assert len(source.succeed("zfs allow pool/syncoid")) == 0, "Syncoid dataset shouldn't have delegated permissions set after snapshotting"
# Sync snapshots
target.wait_for_open_port(22)
source.succeed("touch /mnt/pool/syncoid/test.txt")
@ -96,5 +104,9 @@ in {
target.succeed("cat /mnt/pool/sanoid/test.txt")
source.systemctl("start --wait syncoid-pool-syncoid.service")
target.succeed("cat /mnt/pool/syncoid/test.txt")
assert len(source.succeed("zfs allow pool")) == 0, "Pool shouldn't have delegated permissions set after syncing snapshots"
assert len(source.succeed("zfs allow pool/sanoid")) == 0, "Sanoid dataset shouldn't have delegated permissions set after syncing snapshots"
assert len(source.succeed("zfs allow pool/syncoid")) == 0, "Syncoid dataset shouldn't have delegated permissions set after syncing snapshots"
'';
})

View file

@ -1,4 +1,4 @@
{ lib, stdenv, fetchFromGitHub, makeWrapper, zfs
{ lib, stdenv, fetchFromGitHub, nixosTests, makeWrapper, zfs
, perlPackages, procps, which, openssh, mbuffer, pv, lzop, gzip, pigz }:
with lib;
@ -17,6 +17,8 @@ stdenv.mkDerivation rec {
nativeBuildInputs = [ makeWrapper ];
buildInputs = with perlPackages; [ perl ConfigIniFiles CaptureTiny ];
passthru.tests = nixosTests.sanoid;
installPhase = ''
runHook preInstall