234 lines
8.7 KiB
Bash
234 lines
8.7 KiB
Bash
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#!/bin/sh
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set -eu
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_tls_ensure_private() {
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local f="$1"; shift
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[ -s "$f" ] || openssl genrsa -out "$f" 4096
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}
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_tls_san() {
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{
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ip -oneline address | awk '{ gsub(/\/.+$/, "", $4); print "IP:" $4 }'
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{
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cat /etc/hostname
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echo 'docker'
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echo 'localhost'
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hostname -f
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hostname -s
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} | sed 's/^/DNS:/'
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[ -z "${DOCKER_TLS_SAN:-}" ] || echo "$DOCKER_TLS_SAN"
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} | sort -u | xargs printf '%s,' | sed "s/,\$//"
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}
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_tls_generate_certs() {
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local dir="$1"; shift
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# if server/{ca,key,cert}.pem && !ca/key.pem, do NOTHING except verify (user likely managing CA themselves)
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# if ca/key.pem || !ca/cert.pem, generate CA public if necessary
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# if ca/key.pem, generate server public
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# if ca/key.pem, generate client public
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# (regenerating public certs every startup to account for SAN/IP changes and/or expiration)
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if [ -s "$dir/server/ca.pem" ] && [ -s "$dir/server/cert.pem" ] && [ -s "$dir/server/key.pem" ] && [ ! -s "$dir/ca/key.pem" ]; then
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openssl verify -CAfile "$dir/server/ca.pem" "$dir/server/cert.pem"
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return 0
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fi
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# https://github.com/FiloSottile/mkcert/issues/174
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local certValidDays='825'
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if [ -s "$dir/ca/key.pem" ] || [ ! -s "$dir/ca/cert.pem" ]; then
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# if we either have a CA private key or do *not* have a CA public key, then we should create/manage the CA
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mkdir -p "$dir/ca"
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_tls_ensure_private "$dir/ca/key.pem"
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openssl req -new -key "$dir/ca/key.pem" \
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-out "$dir/ca/cert.pem" \
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-subj '/CN=docker:dind CA' -x509 -days "$certValidDays"
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fi
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if [ -s "$dir/ca/key.pem" ]; then
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# if we have a CA private key, we should create/manage a server key
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mkdir -p "$dir/server"
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_tls_ensure_private "$dir/server/key.pem"
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openssl req -new -key "$dir/server/key.pem" \
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-out "$dir/server/csr.pem" \
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-subj '/CN=docker:dind server'
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cat > "$dir/server/openssl.cnf" <<-EOF
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[ x509_exts ]
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subjectAltName = $(_tls_san)
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EOF
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openssl x509 -req \
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-in "$dir/server/csr.pem" \
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-CA "$dir/ca/cert.pem" \
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-CAkey "$dir/ca/key.pem" \
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-CAcreateserial \
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-out "$dir/server/cert.pem" \
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-days "$certValidDays" \
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-extfile "$dir/server/openssl.cnf" \
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-extensions x509_exts
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cp "$dir/ca/cert.pem" "$dir/server/ca.pem"
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openssl verify -CAfile "$dir/server/ca.pem" "$dir/server/cert.pem"
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fi
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if [ -s "$dir/ca/key.pem" ]; then
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# if we have a CA private key, we should create/manage a client key
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mkdir -p "$dir/client"
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_tls_ensure_private "$dir/client/key.pem"
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chmod 0644 "$dir/client/key.pem" # openssl defaults to 0600 for the private key, but this one needs to be shared with arbitrary client contexts
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openssl req -new \
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-key "$dir/client/key.pem" \
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-out "$dir/client/csr.pem" \
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-subj '/CN=docker:dind client'
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cat > "$dir/client/openssl.cnf" <<-'EOF'
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[ x509_exts ]
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extendedKeyUsage = clientAuth
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EOF
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openssl x509 -req \
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-in "$dir/client/csr.pem" \
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-CA "$dir/ca/cert.pem" \
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-CAkey "$dir/ca/key.pem" \
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-CAcreateserial \
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-out "$dir/client/cert.pem" \
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-days "$certValidDays" \
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-extfile "$dir/client/openssl.cnf" \
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-extensions x509_exts
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cp "$dir/ca/cert.pem" "$dir/client/ca.pem"
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openssl verify -CAfile "$dir/client/ca.pem" "$dir/client/cert.pem"
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fi
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}
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# no arguments passed
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# or first arg is `-f` or `--some-option`
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if [ "$#" -eq 0 ] || [ "${1#-}" != "$1" ]; then
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# set "dockerSocket" to the default "--host" *unix socket* value (for both standard or rootless)
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uid="$(id -u)"
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if [ "$uid" = '0' ]; then
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dockerSocket='unix:///var/run/docker.sock'
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else
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# if we're not root, we must be trying to run rootless
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: "${XDG_RUNTIME_DIR:=/run/user/$uid}"
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dockerSocket="unix://$XDG_RUNTIME_DIR/docker.sock"
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fi
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case "${DOCKER_HOST:-}" in
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unix://*)
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dockerSocket="$DOCKER_HOST"
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;;
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esac
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# add our default arguments
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if [ -n "${DOCKER_TLS_CERTDIR:-}" ]; then
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_tls_generate_certs "$DOCKER_TLS_CERTDIR"
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# generate certs and use TLS if requested/possible (default in 19.03+)
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set -- dockerd \
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--host="$dockerSocket" \
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--host=tcp://0.0.0.0:2376 \
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--tlsverify \
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--tlscacert "$DOCKER_TLS_CERTDIR/server/ca.pem" \
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--tlscert "$DOCKER_TLS_CERTDIR/server/cert.pem" \
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--tlskey "$DOCKER_TLS_CERTDIR/server/key.pem" \
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"$@"
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DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS="${DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS:-} -p 0.0.0.0:2376:2376/tcp"
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else
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# TLS disabled (-e DOCKER_TLS_CERTDIR='') or missing certs
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set -- dockerd \
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--host="$dockerSocket" \
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--host=tcp://0.0.0.0:2375 \
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"$@"
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DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS="${DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS:-} -p 0.0.0.0:2375:2375/tcp"
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fi
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fi
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if [ "$1" = 'dockerd' ]; then
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# explicitly remove Docker's default PID file to ensure that it can start properly if it was stopped uncleanly (and thus didn't clean up the PID file)
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find /run /var/run -iname 'docker*.pid' -delete || :
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# XXX inject "docker-init" (tini) as pid1 to workaround https://github.com/docker-library/docker/issues/318 (zombie container-shim processes)
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set -- docker-init -- "$@"
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iptablesLegacy=
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if [ -n "${DOCKER_IPTABLES_LEGACY+x}" ]; then
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# let users choose explicitly to legacy or not to legacy
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iptablesLegacy="$DOCKER_IPTABLES_LEGACY"
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if [ -n "$iptablesLegacy" ]; then
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modprobe ip_tables || :
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else
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modprobe nf_tables || :
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fi
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elif (
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# https://git.netfilter.org/iptables/tree/iptables/nft-shared.c?id=f5cf76626d95d2c491a80288bccc160c53b44e88#n420
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# https://github.com/docker-library/docker/pull/468#discussion_r1442131459
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for f in /proc/net/ip_tables_names /proc/net/ip6_tables_names /proc/net/arp_tables_names; do
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if b="$(cat "$f")" && [ -n "$b" ]; then
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exit 0
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fi
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done
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exit 1
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); then
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# if we already have any "legacy" iptables rules, we should always use legacy
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iptablesLegacy=1
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elif ! iptables -nL > /dev/null 2>&1; then
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# if iptables fails to run, chances are high the necessary kernel modules aren't loaded (perhaps the host is using xtables, for example)
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# https://github.com/docker-library/docker/issues/350
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# https://github.com/moby/moby/issues/26824
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# https://github.com/docker-library/docker/pull/437#issuecomment-1854900620
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modprobe nf_tables || :
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if ! iptables -nL > /dev/null 2>&1; then
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# might be host has no nf_tables, but Alpine is all-in now (so let's try a legacy fallback)
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modprobe ip_tables || :
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if /usr/local/sbin/.iptables-legacy/iptables -nL > /dev/null 2>&1; then
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iptablesLegacy=1
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fi
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fi
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fi
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if [ -n "$iptablesLegacy" ]; then
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# see https://github.com/docker-library/docker/issues/463 (and the dind Dockerfile where this directory is set up)
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export PATH="/usr/local/sbin/.iptables-legacy:$PATH"
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fi
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iptables --version # so users can see whether it's legacy or not
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uid="$(id -u)"
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if [ "$uid" != '0' ]; then
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# if we're not root, we must be trying to run rootless
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if ! command -v rootlesskit > /dev/null; then
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echo >&2 "error: attempting to run rootless dockerd but missing 'rootlesskit' (perhaps the 'docker:dind-rootless' image variant is intended?)"
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exit 1
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fi
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user="$(id -un 2>/dev/null || :)"
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if ! grep -qE "^($uid${user:+|$user}):" /etc/subuid || ! grep -qE "^($uid${user:+|$user}):" /etc/subgid; then
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echo >&2 "error: attempting to run rootless dockerd but missing necessary entries in /etc/subuid and/or /etc/subgid for $uid"
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exit 1
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fi
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: "${XDG_RUNTIME_DIR:=/run/user/$uid}"
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export XDG_RUNTIME_DIR
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if ! mkdir -p "$XDG_RUNTIME_DIR" || [ ! -w "$XDG_RUNTIME_DIR" ] || ! mkdir -p "$HOME/.local/share/docker" || [ ! -w "$HOME/.local/share/docker" ]; then
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echo >&2 "error: attempting to run rootless dockerd but need writable HOME ($HOME) and XDG_RUNTIME_DIR ($XDG_RUNTIME_DIR) for user $uid"
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exit 1
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fi
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if [ -f /proc/sys/kernel/unprivileged_userns_clone ] && unprivClone="$(cat /proc/sys/kernel/unprivileged_userns_clone)" && [ "$unprivClone" != '1' ]; then
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echo >&2 "error: attempting to run rootless dockerd but need 'kernel.unprivileged_userns_clone' (/proc/sys/kernel/unprivileged_userns_clone) set to 1"
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exit 1
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fi
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if [ -f /proc/sys/user/max_user_namespaces ] && maxUserns="$(cat /proc/sys/user/max_user_namespaces)" && [ "$maxUserns" = '0' ]; then
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echo >&2 "error: attempting to run rootless dockerd but need 'user.max_user_namespaces' (/proc/sys/user/max_user_namespaces) set to a sufficiently large value"
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exit 1
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fi
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# TODO overlay support detection?
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exec rootlesskit \
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--net="${DOCKERD_ROOTLESS_ROOTLESSKIT_NET:-vpnkit}" \
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--mtu="${DOCKERD_ROOTLESS_ROOTLESSKIT_MTU:-1500}" \
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--disable-host-loopback \
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--port-driver=builtin \
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--copy-up=/etc \
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--copy-up=/run \
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${DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS:-} \
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"$@"
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elif [ -x '/usr/local/bin/dind' ]; then
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# if we have the (mostly defunct now) Docker-in-Docker wrapper script, use it
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set -- '/usr/local/bin/dind' "$@"
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fi
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else
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# if it isn't `dockerd` we're trying to run, pass it through `docker-entrypoint.sh` so it gets `DOCKER_HOST` set appropriately too
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set -- docker-entrypoint.sh "$@"
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fi
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exec "$@"
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