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From e6412be62079bbec5d67d178711ea42f21cafab8 Mon Sep 17 00:00:00 2001
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From: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Date: Tue, 12 Oct 2021 16:35:00 +0200
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Subject: [PATCH 1/2] Inhibit sshd-keygen@.service if cloud-init is active
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(#1028)
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RH-Author: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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RH-MergeRequest: 11: Add drop-in to prevent race with sshd-keygen service
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RH-Commit: [1/2] 77ba3f167e71c43847aa5b38e1833d84568ed5a7 (eesposit/cloud-init-centos-)
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RH-Bugzilla: 2002492
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RH-Acked-by: Eduardo Otubo <otubo@redhat.com>
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RH-Acked-by: Mohamed Gamal Morsy <mmorsy@redhat.com>
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TESTED: by me and QA
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BREW: 40286693
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commit 02c71f097bca455a0f87d3e0a2af4d04b1cbd727
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Author: Ryan Harper <ryan.harper@canonical.com>
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Date: Tue Oct 12 09:31:36 2021 -0500
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Inhibit sshd-keygen@.service if cloud-init is active (#1028)
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In some cloud-init enabled images the sshd-keygen@.service
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may race with cloud-init and prevent ssh host keys from being
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generated or generating host keys twice slowing boot and consuming
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additional entropy during boot. This drop-in unit adds a condition to
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the sshd-keygen@.service which prevents running if cloud-init is active.
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Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Conflicts: minor conflict in setup.py (line 253), where we still use
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"/usr/lib/" instead of LIB
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---
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packages/redhat/cloud-init.spec.in | 1 +
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packages/suse/cloud-init.spec.in | 1 +
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setup.py | 5 ++++-
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systemd/disable-sshd-keygen-if-cloud-init-active.conf | 8 ++++++++
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4 files changed, 14 insertions(+), 1 deletion(-)
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create mode 100644 systemd/disable-sshd-keygen-if-cloud-init-active.conf
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diff --git a/packages/redhat/cloud-init.spec.in b/packages/redhat/cloud-init.spec.in
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index 16138012..1491822b 100644
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--- a/packages/redhat/cloud-init.spec.in
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+++ b/packages/redhat/cloud-init.spec.in
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@@ -175,6 +175,7 @@ fi
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%if "%{init_system}" == "systemd"
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/usr/lib/systemd/system-generators/cloud-init-generator
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+%{_sysconfdir}/systemd/system/sshd-keygen@.service.d/disable-sshd-keygen-if-cloud-init-active.conf
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%{_unitdir}/cloud-*
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%else
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%attr(0755, root, root) %{_initddir}/cloud-config
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diff --git a/packages/suse/cloud-init.spec.in b/packages/suse/cloud-init.spec.in
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index 004b875f..da8107b4 100644
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--- a/packages/suse/cloud-init.spec.in
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+++ b/packages/suse/cloud-init.spec.in
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@@ -126,6 +126,7 @@ version_pys=$(cd "%{buildroot}" && find . -name version.py -type f)
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%{_sysconfdir}/dhcp/dhclient-exit-hooks.d/hook-dhclient
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%{_sysconfdir}/NetworkManager/dispatcher.d/hook-network-manager
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+%{_sysconfdir}/systemd/system/sshd-keygen@.service.d/disable-sshd-keygen-if-cloud-init-active.conf
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# Python code is here...
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%{python_sitelib}/*
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diff --git a/setup.py b/setup.py
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index d5cd01a4..ec03fa27 100755
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--- a/setup.py
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+++ b/setup.py
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@@ -38,6 +38,7 @@ def is_generator(p):
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def pkg_config_read(library, var):
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fallbacks = {
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'systemd': {
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+ 'systemdsystemconfdir': '/etc/systemd/system',
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'systemdsystemunitdir': '/lib/systemd/system',
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'systemdsystemgeneratordir': '/lib/systemd/system-generators',
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}
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@@ -249,7 +250,9 @@ if not platform.system().endswith('BSD'):
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data_files.extend([
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(ETC + '/NetworkManager/dispatcher.d/',
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['tools/hook-network-manager']),
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- ('/usr/lib/udev/rules.d', [f for f in glob('udev/*.rules')])
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+ ('/usr/lib/udev/rules.d', [f for f in glob('udev/*.rules')]),
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+ (ETC + '/systemd/system/sshd-keygen@.service.d/',
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+ ['systemd/disable-sshd-keygen-if-cloud-init-active.conf']),
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])
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# Use a subclass for install that handles
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# adding on the right init system configuration files
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diff --git a/systemd/disable-sshd-keygen-if-cloud-init-active.conf b/systemd/disable-sshd-keygen-if-cloud-init-active.conf
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new file mode 100644
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index 00000000..71e35876
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--- /dev/null
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+++ b/systemd/disable-sshd-keygen-if-cloud-init-active.conf
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@@ -0,0 +1,8 @@
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+# In some cloud-init enabled images the sshd-keygen template service may race
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+# with cloud-init during boot causing issues with host key generation. This
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+# drop-in config adds a condition to sshd-keygen@.service if it exists and
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+# prevents the sshd-keygen units from running *if* cloud-init is going to run.
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+#
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+[Unit]
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+ConditionPathExists=!/run/systemd/generator.early/multi-user.target.wants/cloud-init.target
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+EOF
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--
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2.27.0
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