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5bd4233d7b
When slirp4netns v0.4.0+ is used, now slirp4netns is hardened using
mount namespace ("sandbox") and seccomp to mitigate potential
vulnerabilities.
bump up rootlesskit: 2fcff6ceae...791ac8cb20
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
(cherry picked from commit e20b7323fb)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
95 lines
3.2 KiB
Bash
Executable file
95 lines
3.2 KiB
Bash
Executable file
#!/bin/sh
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# dockerd-rootless.sh executes dockerd in rootless mode.
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#
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# Usage: dockerd-rootless.sh --experimental [DOCKERD_OPTIONS]
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# Currently, specifying --experimental is mandatory.
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# Also, to expose ports, you need to specify
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# --userland-proxy-path=/path/to/rootlesskit-docker-proxy
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#
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# External dependencies:
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# * newuidmap and newgidmap needs to be installed.
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# * /etc/subuid and /etc/subgid needs to be configured for the current user.
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# * Either one of slirp4netns (v0.3+), VPNKit, lxc-user-nic needs to be installed.
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# slirp4netns is used by default if installed. Otherwise fallsback to VPNKit.
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# The default value can be overridden with $DOCKERD_ROOTLESS_ROOTLESSKIT_NET=(slirp4netns|vpnkit|lxc-user-nic)
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#
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# See the documentation for the further information.
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set -e -x
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if ! [ -w $XDG_RUNTIME_DIR ]; then
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echo "XDG_RUNTIME_DIR needs to be set and writable"
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exit 1
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fi
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if ! [ -w $HOME ]; then
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echo "HOME needs to be set and writable"
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exit 1
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fi
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rootlesskit=""
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for f in docker-rootlesskit rootlesskit; do
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if which $f >/dev/null 2>&1; then
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rootlesskit=$f
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break
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fi
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done
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if [ -z $rootlesskit ]; then
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echo "rootlesskit needs to be installed"
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exit 1
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fi
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_NET:=}"
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_MTU:=}"
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# if slirp4netns v0.4.0+ is installed, slirp4netns is hardened using sandbox (mount namespace) and seccomp
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX:=auto}"
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP:=auto}"
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net=$DOCKERD_ROOTLESS_ROOTLESSKIT_NET
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mtu=$DOCKERD_ROOTLESS_ROOTLESSKIT_MTU
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if [ -z $net ]; then
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if which slirp4netns >/dev/null 2>&1; then
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if slirp4netns --help | grep -- --disable-host-loopback; then
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net=slirp4netns
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if [ -z $mtu ]; then
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mtu=65520
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fi
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else
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echo "slirp4netns does not support --disable-host-loopback. Falling back to VPNKit."
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fi
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fi
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if [ -z $net ]; then
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if which vpnkit >/dev/null 2>&1; then
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net=vpnkit
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else
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echo "Either slirp4netns (v0.3+) or vpnkit needs to be installed"
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exit 1
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fi
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fi
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fi
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if [ -z $mtu ]; then
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mtu=1500
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fi
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if [ -z $_DOCKERD_ROOTLESS_CHILD ]; then
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_DOCKERD_ROOTLESS_CHILD=1
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export _DOCKERD_ROOTLESS_CHILD
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# Re-exec the script via RootlessKit, so as to create unprivileged {user,mount,network} namespaces.
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#
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# --copy-up allows removing/creating files in the directories by creating tmpfs and symlinks
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# * /etc: copy-up is required so as to prevent `/etc/resolv.conf` in the
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# namespace from being unexpectedly unmounted when `/etc/resolv.conf` is recreated on the host
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# (by either systemd-networkd or NetworkManager)
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# * /run: copy-up is required so that we can create /run/docker (hardcoded for plugins) in our namespace
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exec $rootlesskit \
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--net=$net --mtu=$mtu \
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--slirp4netns-sandbox=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX \
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--slirp4netns-seccomp=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP \
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--disable-host-loopback --port-driver=builtin \
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--copy-up=/etc --copy-up=/run \
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$DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS \
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$0 $@
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else
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[ $_DOCKERD_ROOTLESS_CHILD = 1 ]
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# remove the symlinks for the existing files in the parent namespace if any,
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# so that we can create our own files in our mount namespace.
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rm -f /run/docker /run/xtables.lock
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exec dockerd $@
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fi
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