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dockerd-rootless.sh: avoid /run/xtables.lock EACCES on SELinux hosts

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Previously, running dockerd-rootless.sh on SELinux-enabled hosts
was failing with "can't open lock file /run/xtables.lock: Permission denied" error.
(issue 41230).

This commit avoids hitting the error by relabeling /run in the RootlessKit child.
The actual /run on the parent is unaffected.

e6fc34b71a/libpod/networking_linux.go (L396-L401)

Tested on Fedora 34

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
This commit is contained in:
Akihiro Suda 2021-03-25 17:23:37 +09:00
parent bac9062496
commit cdaf82ba3f
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GPG key ID: 49524C6F9F638F1A
1 changed files with 13 additions and 0 deletions
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13
contrib/dockerd-rootless.sh
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@ -84,6 +84,12 @@ if [ -z $_DOCKERD_ROOTLESS_CHILD ]; then
echo "This script must be executed as a non-privileged user"
exit 1
fi
# `selinuxenabled` always returns false in RootlessKit child, so we execute `selinuxenabled` in the parent.
# https://github.com/rootless-containers/rootlesskit/issues/94
if command -v selinuxenabled > /dev/null 2>&1 && selinuxenabled; then
_DOCKERD_ROOTLESS_SELINUX=1
export _DOCKERD_ROOTLESS_SELINUX
fi
# Re-exec the script via RootlessKit, so as to create unprivileged {user,mount,network} namespaces.
#
# --copy-up allows removing/creating files in the directories by creating tmpfs and symlinks
@ -105,5 +111,12 @@ else
# remove the symlinks for the existing files in the parent namespace if any,
# so that we can create our own files in our mount namespace.
rm -f /run/docker /run/containerd /run/xtables.lock
if [ -n "$_DOCKERD_ROOTLESS_SELINUX" ]; then
# iptables requires /run in the child to be relabeled. The actual /run in the parent is unaffected.
# https://github.com/containers/podman/blob/e6fc34b71aa9d876b1218efe90e14f8b912b0603/libpod/networking_linux.go#L396-L401
# https://github.com/moby/moby/issues/41230
chcon system_u:object_r:iptables_var_run_t:s0 /run
fi
exec dockerd $@
fi