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nixos/nextcloud: minor docs cleanup for openssl change

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* s/NextCloud/Nextcloud/g
* `enableBrokenCiphersForSSE` should be enabled by default for any NixOS
  installation from before 22.11 to make sure existing installations
  don't run into the issue. Not the other way round.
* Update release notes to reflect on that.
* Improve wording of the warning a bit: explain which option to change
  to get rid of it.
* Ensure that basic tests w/o `enableBrokenCiphersForSSE` run with
  OpenSSL 3.
This commit is contained in:
Maximilian Bosch 2022-11-08 22:52:27 +01:00
parent 394d4de877
commit 61128cba67
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4 changed files with 43 additions and 29 deletions
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26
nixos/doc/manual/from_md/release-notes/rl-2211.section.xml
View File

@ -609,18 +609,20 @@
</listitem>
<listitem>
<para>
The NextCloud NixOS module uses OpenSSL 3.x for its PHP’s
openssl extension, this breaks RC4-based server-side
encryption in NextCloud, making all your files unreadable upon
upgrade. Upon testing, we could not trigger any cases of
<emphasis role="strong">data loss</emphasis>, but we
<emphasis role="strong">cannot guarantee</emphasis> that for
every accidental OpenSSL upgrade. To restore functionality,
<link linkend="opt-services.nextcloud.enableBrokenCiphersForSSE"><literal>services.nextcloud.enableBrokenCiphersForSSE</literal></link>
has to be set to <literal>true</literal>. NextCloud is
planning to implement AES-256-GCM server-side encryption in
the future through
<link xlink:href="https://github.com/nextcloud/server/pull/25551">https://github.com/nextcloud/server/pull/25551</link>.
The <literal>openssl</literal>-extension for the PHP
interpreter used by <literal>services.nextcloud</literal> is
built against OpenSSL 1.1 if
<xref linkend="opt-system.stateVersion" /> is below
<literal>22.11</literal>. This is to make sure that people
using
<link xlink:href="https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/encryption_configuration.html">server-side
encryption</link> don’t loose access to their files.
</para>
<para>
In any other case it’s safe to use OpenSSL 3 for PHP’s openssl
extension. This can be done by setting
<xref linkend="opt-services.nextcloud.enableBrokenCiphersForSSE" />
to <literal>false</literal>.
</para>
</listitem>
<listitem>

7
nixos/doc/manual/release-notes/rl-2211.section.md
View File

@ -196,7 +196,12 @@ Available as [services.patroni](options.html#opt-services.patroni.enable).
- The `p4` package now only includes the open-source Perforce Helix Core command-line client and APIs. It no longer installs the unfree Helix Core Server binaries `p4d`, `p4broker`, and `p4p`. To install the Helix Core Server binaries, use the `p4d` package instead.
- The NextCloud NixOS module uses OpenSSL 3.x for its PHP's openssl extension, this breaks RC4-based server-side encryption in NextCloud, making all your files unreadable upon upgrade. Upon testing, we could not trigger any cases of **data loss**, but we **cannot guarantee** that for every accidental OpenSSL upgrade. To restore functionality, [`services.nextcloud.enableBrokenCiphersForSSE`](#opt-services.nextcloud.enableBrokenCiphersForSSE) has to be set to `true`. NextCloud is planning to implement AES-256-GCM server-side encryption in the future through <https://github.com/nextcloud/server/pull/25551>.
- The `openssl`-extension for the PHP interpreter used by `services.nextcloud` is built against OpenSSL 1.1 if
[](#opt-system.stateVersion) is below `22.11`. This is to make sure that people using [server-side encryption](https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/encryption_configuration.html)
don't loose access to their files.
In any other case it's safe to use OpenSSL 3 for PHP's openssl extension. This can be done by setting
[](#opt-services.nextcloud.enableBrokenCiphersForSSE) to `false`.
- The `coq` package and versioned variants starting at `coq_8_14` no
longer include CoqIDE, which is now available through

37
nixos/modules/services/web-apps/nextcloud.nix
View File

@ -15,7 +15,7 @@ let
(with all;
# disable default openssl extension
(lib.filter (e: e.pname != "openssl") enabled)
# use OpenSSL 1.1 for RC4 NextCloud encryption if user
# use OpenSSL 1.1 for RC4 Nextcloud encryption if user
# has acknowledged the brokeness of the ciphers (RC4).
# TODO: remove when https://github.com/nextcloud/server/issues/32003 is fixed.
++ (if cfg.enableBrokenCiphersForSSE then [ cfg.phpPackage.extensions.openssl-legacy ] else [ cfg.phpPackage.extensions.openssl ])
@ -88,32 +88,32 @@ in {
enableBrokenCiphersForSSE = mkOption {
type = types.bool;
# Workaround can be removed at backport-time for 22.11.
default = !(versionOlder stateVersion "22.11");
default = versionOlder stateVersion "22.11";
defaultText = literalExpression "versionOlder system.stateVersion \"22.11\"";
description = lib.mdDoc ''
This option uses OpenSSL PHP extension linked against OpenSSL 1.x rather
This option uses OpenSSL PHP extension linked against OpenSSL 1.1 rather
than latest OpenSSL (≥ 3), this is not recommended except if you need
it.
Server-side encryption in NextCloud uses RC4 ciphers, a broken cipher
Server-side encryption in Nextcloud uses RC4 ciphers, a broken cipher
since ~2004.
This cipher has been disabled in OpenSSL ≥ 3 and requires
a specific legacy profile to re-enable it.
If you upgrade to a NextCloud using OpenSSL ≥ 3 and have
If you upgrade to a Nextcloud using OpenSSL ≥ 3 and have
server-side encryption configured, you will not be able to access
your files anymore, enabling this option can restore access to your files.
your files anymore. Enabling this option can restore access to your files.
Upon testing we didn't encounter any data corruption when turning
this on and off again, but this cannot be guaranteed for
each Nextcloud installation.
Unless you are using external storage,
it is advised to [disable server-side encryption](https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/encryption_configuration.html#disabling-encryption) as it is unclear
it provides any amount of security beyond encryption for external storage.
If you know more about this feature and is keen on it,
please chime in <https://github.com/NixOS/nixpkgs/pull/198470> or open
an issue in nixpkgs.
In the future, NextCloud may move to AES-256-GCM, by then,
this option will be deprecated.
In the future, Nextcloud may move to AES-256-GCM, by then,
this option will be removed.
'';
};
hostName = mkOption {
@ -686,12 +686,17 @@ in {
++ (optional (versionOlder cfg.package.version "24") (upgradeWarning 23 "22.05"))
++ (optional (versionOlder cfg.package.version "25") (upgradeWarning 24 "22.11"))
++ (optional cfg.enableBrokenCiphersForSSE ''
You're using PHP's openssl extension built against OpenSSL 1.1.
This is only necessary if you're using NextCloud's server-side encryption.
You're using PHP's openssl extension built against OpenSSL 1.1 for Nextcloud.
This is only necessary if you're using Nextcloud's server-side encryption.
Please keep in mind that it's using the broken RC4 cipher.
In order to disable this option and remove this warning,
server-side encryption has to be disabled, see <https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/encryption_configuration.html#disabling-encryption> on how to achieve this.
If you don't use that feature, you can switch to OpenSSL 3 by declaring
services.nextcloud.enableBrokenCiphersForSSE = false;
Otherwise you'd have to disable server-side encryption first in order
to be able to safely disable this option and get rid of that warning.
See <https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/encryption_configuration.html#disabling-encryption> on how to achieve this.
For more context, here is the implementing pull request: https://github.com/NixOS/nixpkgs/pull/198470
'')

2
nixos/tests/nextcloud/basic.nix
View File

@ -37,6 +37,8 @@ in {
"d /var/lib/nextcloud-data 0750 nextcloud nginx - -"
];
system.stateVersion = "22.11";
services.nextcloud = {
enable = true;
datadir = "/var/lib/nextcloud-data";