# Copyright (c) 2015-2021 Tigera, Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
ARG ARCH=x86_64
ARG GIT_VERSION=unknown
ARG IPTABLES_VER=1.8.4-17
ARG LIBNFTNL_VER=1.1.5-4
ARG IPSET_VER=7.11-6
ARG RUNIT_VER=2.1.2
ARG BIRD_IMAGE=calico/bird:latest
ARG UBI_IMAGE

FROM calico/bpftool:v5.3-amd64 as bpftool
FROM ${BIRD_IMAGE} as bird

# Use this build stage to build iptables rpm and runit binaries.
# We need to rebuild the iptables rpm because the prepackaged rpm does not have legacy iptables binaries.
# We need to build runit because there aren't any rpms for it in CentOS or ubi repositories.
FROM quay.io/centos/centos:stream8 as centos

ARG ARCH
ARG IPTABLES_VER
ARG LIBNFTNL_VER
ARG IPSET_VER
ARG RUNIT_VER
ARG CENTOS_MIRROR_BASE_URL=http://linuxsoft.cern.ch/centos-vault/8.4.2105
ARG LIBNFTNL_SOURCERPM_URL=${CENTOS_MIRROR_BASE_URL}/BaseOS/Source/SPackages/libnftnl-${LIBNFTNL_VER}.el8.src.rpm
ARG IPTABLES_SOURCERPM_URL=${CENTOS_MIRROR_BASE_URL}/BaseOS/Source/SPackages/iptables-${IPTABLES_VER}.el8.src.rpm
ARG STREAM9_MIRROR_BASE_URL=https://iad.mirror.rackspace.com/centos-stream/9-stream
ARG IPSET_SOURCERPM_URL=${STREAM9_MIRROR_BASE_URL}/BaseOS/source/tree/Packages/ipset-${IPSET_VER}.el9.src.rpm

# Install build dependencies and security updates.
RUN dnf install -y 'dnf-command(config-manager)' && \
    # Enable PowerTools repo for '-devel' packages
    dnf config-manager --set-enabled powertools && \
    # Install required packages for building rpms. yum-utils is not required but it gives us yum-builddep to easily install build deps.
    yum install -y rpm-build yum-utils make && \
    # Need these to build runit.
    yum install -y wget glibc-static gcc && \
    # Ensure security updates are installed.
    yum -y update-minimal --security --sec-severity=Important --sec-severity=Critical

# In order to rebuild the iptables RPM, we first need to rebuild the libnftnl RPM because building
# iptables requires libnftnl-devel but libnftnl-devel is not available on ubi or CentOS repos.
# (Note: it's not in RHEL8.1 either https://bugzilla.redhat.com/show_bug.cgi?id=1711361).
# Rebuilding libnftnl will give us libnftnl-devel too.
RUN rpm -i ${LIBNFTNL_SOURCERPM_URL} && \
    yum-builddep -y --spec /root/rpmbuild/SPECS/libnftnl.spec && \
    rpmbuild -bb /root/rpmbuild/SPECS/libnftnl.spec && \
    # Now install libnftnl and libnftnl-devel
    rpm -Uv /root/rpmbuild/RPMS/${ARCH}/libnftnl-${LIBNFTNL_VER}.el8.${ARCH}.rpm && \
    rpm -Uv /root/rpmbuild/RPMS/${ARCH}/libnftnl-devel-${LIBNFTNL_VER}.el8.${ARCH}.rpm && \
    # Install source RPM for iptables and install its build dependencies.
    rpm -i ${IPTABLES_SOURCERPM_URL} && \
    yum-builddep -y --spec /root/rpmbuild/SPECS/iptables.spec

# Patch the iptables build spec so that we keep the legacy iptables binaries.
RUN sed -i '/drop all legacy tools/,/sbindir.*legacy/d' /root/rpmbuild/SPECS/iptables.spec

# Patch the iptables build spec to drop the renaming of nft binaries. Instead of renaming binaries,
# we will use alternatives to set the canonical iptables binaries.
RUN sed -i '/rename nft versions to standard name/,/^done/d' /root/rpmbuild/SPECS/iptables.spec

# Patch the iptables build spec so that legacy and nft iptables binaries are verified to be in the resulting rpm.
RUN sed -i '/%files$/a \
\%\{_sbindir\}\/xtables-legacy-multi \n\
\%\{_sbindir\}\/ip6tables-legacy \n\
\%\{_sbindir\}\/ip6tables-legacy-restore \n\
\%\{_sbindir\}\/ip6tables-legacy-save \n\
\%\{_sbindir\}\/iptables-legacy \n\
\%\{_sbindir\}\/iptables-legacy-restore \n\
\%\{_sbindir\}\/iptables-legacy-save \n\
\%\{_sbindir\}\/ip6tables-nft\n\
\%\{_sbindir\}\/ip6tables-nft-restore\n\
\%\{_sbindir\}\/ip6tables-nft-save\n\
\%\{_sbindir\}\/iptables-nft\n\
\%\{_sbindir\}\/iptables-nft-restore\n\
\%\{_sbindir\}\/iptables-nft-save\n\
' /root/rpmbuild/SPECS/iptables.spec

# Finally rebuild iptables.
RUN rpmbuild -bb /root/rpmbuild/SPECS/iptables.spec

# Install source RPM for ipset and install its build dependencies.
RUN rpm -i ${IPSET_SOURCERPM_URL} && \
    yum-builddep -y --spec /root/rpmbuild/SPECS/ipset.spec && \
    rpmbuild -bb /root/rpmbuild/SPECS/ipset.spec

# runit is not available in ubi or CentOS repos so build it.
# get it from the debian repos as the official website doesn't support https
RUN wget -P /tmp https://ftp.debian.org/debian/pool/main/r/runit/runit_${RUNIT_VER}.orig.tar.gz && \
    gunzip /tmp/runit_${RUNIT_VER}.orig.tar.gz && \
    tar -xpf /tmp/runit_${RUNIT_VER}.orig.tar -C /tmp && \
    cd /tmp/admin/runit-${RUNIT_VER}/ && \
    package/install

FROM ${UBI_IMAGE} as ubi

ARG ARCH
ARG GIT_VERSION
ARG IPTABLES_VER
ARG LIBNFTNL_VER
ARG IPSET_VER
ARG RUNIT_VER

# Update base packages to pick up security updates.  Must do this before adding the centos repo.
RUN microdnf update

# Copy in runit binaries
COPY --from=centos  /tmp/admin/runit-${RUNIT_VER}/command/* /usr/local/bin/

# Copy in our rpms
COPY --from=centos  /root/rpmbuild/RPMS/${ARCH}/* /tmp/rpms/

# Install the necessary packages, making sure that we're using only CentOS repos.
# Since the ubi repos do not contain all the packages we need (they're missing conntrack-tools),
# we're using CentOS repos for all our packages. Using packages from a single source (CentOS) makes
# it less likely we'll run into package dependency version mismatches.
#
# NOTE: new packages need to be added to the keep-list in clean-up-filesystem.sh.
COPY centos.repo /etc/yum.repos.d/
RUN rm /etc/yum.repos.d/ubi.repo && \
    touch /in-the-container && \
    microdnf install \
    # Don't install copious docs.
    --setopt=tsflags=nodocs \
    # Needed for iptables
    libpcap libmnl libnfnetlink libnetfilter_conntrack \
    iputils \
    # Need arp
    net-tools \
    # Need kmod to ensure ip6tables-save works correctly
    kmod \
    # Also needed (provides utilities for browsing procfs like ps)
    procps \
    iproute \
    iproute-tc \
    # Needed for conntrack
    libnetfilter_cthelper libnetfilter_cttimeout libnetfilter_queue \
    conntrack-tools \
    # Needed for runit startup script
    which \
    # Needed for the cleanup script
    findutils && \
    microdnf clean all && \
    # Install iptables via rpms. The libs must be force installed because the iptables source RPM has the release
    # version '9.el8_0.1' while the existing iptables-libs (pulled in by the iputils package) has version '9.el8.1'.
    rpm --force -i /tmp/rpms/iptables-libs-${IPTABLES_VER}.el8.${ARCH}.rpm && \
    # Install compatible libnftnl version with selected iptables version
    rpm --force -i /tmp/rpms/libnftnl-${LIBNFTNL_VER}.el8.${ARCH}.rpm && \
    rpm -i /tmp/rpms/iptables-${IPTABLES_VER}.el8.${ARCH}.rpm && \
    # Install ipset version
    rpm --force -i /tmp/rpms/ipset-libs-${IPSET_VER}.el8.x86_64.rpm && \
    rpm -i /tmp/rpms/ipset-${IPSET_VER}.el8.x86_64.rpm && \
    # Set alternatives
    alternatives --install /usr/sbin/iptables iptables /usr/sbin/iptables-legacy 1 && \
    alternatives --install /usr/sbin/ip6tables ip6tables /usr/sbin/ip6tables-legacy 1

# Add mitigation for https://access.redhat.com/security/cve/CVE-2019-15718
# This can be removed once we update to ubi:8.1
RUN systemctl disable systemd-resolved

# Change the permissions for ipset so it can be run by any container user.
RUN chgrp 0 /usr/sbin/ipset && \
    chmod g=u /usr/sbin/ipset

# Change the permissions for iptables so it can be run by any container user.
RUN chgrp 0 /usr/sbin/iptables && \
    chmod g=u /usr/sbin/iptables

# Copy our bird binaries in
COPY --from=bird /bird* /bin/

# Set the suid bit on bird to allow our user to execute them with root permissions.
RUN chmod u+s /bin/bird
RUN chmod u+s /bin/bird6

# Copy in the filesystem - this contains licenses, etc...
COPY filesystem/etc/ /etc
COPY filesystem/included-source/ /included-source
COPY filesystem/licenses/ /licenses
COPY filesystem/usr/ /usr
COPY filesystem/sbin/* /usr/sbin/

# Change permissions to make confd templates and output available in /etc/calico
# to all container users.
RUN chgrp -R 0 /etc/calico && \
    chmod -R g=u /etc/calico

COPY --from=bpftool /bpftool /bin

# Copy in the calico-node binary
COPY dist/bin/calico-node-amd64 /bin/calico-node

# Set the suid bit on calico-node
RUN chmod u+s /bin/calico-node

# Clean out as many files as we can from the filesystem.  We no longer need dnf or the platform python install
# or any of its dependencies.
ADD clean-up-filesystem.sh /
RUN /clean-up-filesystem.sh

# Copy everything into a fresh scratch image so that naive CVE scanners don't pick up binaries and libraries
# that have been removed in our later layers.
FROM scratch
COPY --from=ubi / /

# Add in top-level license file
COPY LICENSE /licenses

CMD ["start_runit"]

# Required labels for certification
LABEL name="Calico node" \
      vendor="Project Calico" \
      version=$GIT_VERSION \
      release="1" \
      summary="Calico node handles networking and policy for Calico" \
      description="Calico node handles networking and policy for Calico" \
      maintainer="laurence@tigera.io"

# Tell sv where to find the services.
ENV SVDIR=/etc/service/enabled
