Do not use keyservers to fetch GPG keys for apt

The keyserver infrastructure is unreliable, and just adds another point
of failure without adding any security. Instead, commit the key used at
build time for ZFS to the repo, and inline our signing key into the
install script rather than just its fingerprint.

fix #28510
fix #13555

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

Dockerfile

@@ -30,8 +30,8 @@ ARG APT_MIRROR=deb.debian.org
 RUN sed -ri "s/(httpredir|deb).debian.org/$APT_MIRROR/g" /etc/apt/sources.list
 
 # Add zfs ppa
-RUN apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys E871F18B51E0147C77796AC81196BA81F6B0FC61 \
-	|| apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys E871F18B51E0147C77796AC81196BA81F6B0FC61
+COPY keys/launchpad-ppa-zfs.asc /go/src/github.com/docker/docker/keys/
+RUN apt-key add /go/src/github.com/docker/docker/keys/launchpad-ppa-zfs.asc
 RUN echo deb http://ppa.launchpad.net/zfs-native/stable/ubuntu trusty main > /etc/apt/sources.list.d/zfs.list
 
 # Packaged dependencies

hack/install.sh

@@ -26,12 +26,71 @@ set -e
 url="https://get.docker.com/"
 apt_url="https://apt.dockerproject.org"
 yum_url="https://yum.dockerproject.org"
-gpg_fingerprint="58118E89F3A912897C070ADBF76221572C52609D"
 
-key_servers="
-ha.pool.sks-keyservers.net
-pgp.mit.edu
-keyserver.ubuntu.com
+docker_key="-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1
+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+=Yhur
+-----END PGP PUBLIC KEY BLOCK-----
 "
 
 mirror=''
@@ -125,19 +184,6 @@ check_forked() {
 	fi
 }
 
-rpm_import_repository_key() {
-	local key=$1; shift
-	local tmpdir=$(mktemp -d)
-	chmod 600 "$tmpdir"
-	for key_server in $key_servers ; do
-		gpg --homedir "$tmpdir" --keyserver "$key_server" --recv-keys "$key" && break
-	done
-	gpg --homedir "$tmpdir" -k "$key" >/dev/null
-	gpg --homedir "$tmpdir" --export --armor "$key" > "$tmpdir"/repo.key
-	rpm --import "$tmpdir"/repo.key
-	rm -rf "$tmpdir"
-}
-
 semverParse() {
 	major="${1%%.*}"
 	minor="${1#$major.}"
@@ -410,10 +456,7 @@ do_install() {
 
 			(
 			set -x
-			for key_server in $key_servers ; do
-				$sh_c "apt-key adv --keyserver hkp://${key_server}:80 --recv-keys ${gpg_fingerprint}" && break
-			done
-			$sh_c "apt-key adv -k ${gpg_fingerprint} >/dev/null"
+			echo "$docker_key" | apt-key add -
 			$sh_c "mkdir -p /etc/apt/sources.list.d"
 			$sh_c "echo deb \[arch=$(dpkg --print-architecture)\] ${apt_url}/repo ${lsb_dist}-${dist_version} ${repo} > /etc/apt/sources.list.d/docker.list"
 			$sh_c 'sleep 3; apt-get update; apt-get install -y -q docker-engine'

keys/launchpad-ppa-zfs.asc

@@ -0,0 +1,13 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1
+
+mI0ETjjRQwEEAN1t7LdXiXEDucAXemaXZphLeDSmUE2gHxj/b+Gqt1wRaCMAE1NU
+rLOqTDNq8XPi4ZSp8Rr8R8jVupmKlt446ESGOadUO0AAjFyYe+YwZ65uYa69536k
+T+PhcFepWm8YgJL1skn0u+qpHzMJLvLB6iyAP8fP5C19wjiY8TtpSEtLABEBAAG0
+JkxhdW5jaHBhZCBQUEEgZm9yIE5hdGl2ZSBaRlMgZm9yIExpbnV4iLgEEwECACIF
+Ak440UMCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEBGWuoH2sPxh32cD
+/2uniH9nyAKYI3/6X29pmRXcsuf1J+ZYqEnUIWT41ZBvNJHkbMiSgNC0lUvW4miq
+LgHZrft2X3D1fUP6djnueTnFG/Rs/uVRCMU32YjmxW92nZc6StfNt35LT7CUd9xV
+/6e3h5klln/xUsimOm9BcHglUXF7n8U39qw9JGV2sheo
+=qkiU
+-----END PGP PUBLIC KEY BLOCK-----