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#!/bin/sh
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# PASST - Plug A Simple Socket Transport
# for qemu/UNIX domain socket mode
#
# test/passt.mbuto - mbuto (https://mbuto.sh) profile for test images
#
# Copyright (c) 2022 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>
PROGS="${PROGS:-ash,dash,bash ip mount ls insmod mkdir ln cat chmod lsmod
modprobe find grep mknod mv rm umount jq iperf3 dhclient hostname
sed tr chown sipcalc cut socat dd strace ping tail killall sleep sysctl
nproc tcp_rr tcp_crr udp_rr which tee seq bc sshd ssh-keygen cmp}"
# OpenSSH 9.8 introduced split binaries, with sshd being the daemon, and
# sshd-session the per-session program. We need the latter as well, and the path
# depends on the distribution. It doesn't exist on older versions.
for bin in /usr/lib/openssh/sshd-session /usr/lib/ssh/sshd-session \
/usr/libexec/openssh/sshd-session; do
command -v "${bin}" >/dev/null && PROGS="${PROGS} ${bin}"
done
KMODS="${KMODS:- virtio_net virtio_pci vmw_vsock_virtio_transport}"
LINKS="${LINKS:-
ash,dash,bash /init
ash,dash,bash /bin/sh}"
DIRS="${DIRS} /tmp /usr/sbin /usr/share /var/log /var/lib /etc/ssh /run/sshd /root/.ssh"
COPIES="${COPIES} small.bin,/root/small.bin medium.bin,/root/medium.bin big.bin,/root/big.bin"
FIXUP="${FIXUP}"'
mv /sbin/* /usr/sbin || :
rm -rf /sbin
ln -s /usr/sbin /sbin
cat > /sbin/dhclient-script << EOF
#!/bin/sh
LOG=/var/log/dhclient-script.log
echo \${reason} \${interface} >> \$LOG
set >> \$LOG
[ -n "\${new_interface_mtu}" ] && ip link set dev \${interface} mtu \${new_interface_mtu}
[ -n "\${new_ip_address}" ] && ip addr add \${new_ip_address}/\${new_subnet_mask} dev \${interface}
[ -n "\${new_routers}" ] && for r in \${new_routers}; do ip route add default via \${r} dev \${interface}; done
:> /etc/resolv.conf
[ -n "\${new_domain_name_servers}" ] && for d in \${new_domain_name_servers}; do echo "nameserver \${d}" >> /etc/resolv.conf; done
[ -n "\${new_domain_name}" ] && echo "search \${new_domain_name}" >> /etc/resolf.conf
[ -n "\${new_domain_search}" ] && (printf "search"; for d in \${new_domain_search}; do printf " %s" "\${d}"; done; printf "\n") >> /etc/resolv.conf
[ -n "\${new_ip6_address}" ] && ip addr add \${new_ip6_address}/\${new_ip6_prefixlen} dev \${interface}
[ -n "\${new_dhcp6_name_servers}" ] && for d in \${new_dhcp6_name_servers}; do echo "nameserver \${d}%\${interface}" >> /etc/resolv.conf; done
[ -n "\${new_dhcp6_domain_search}" ] && (printf "search"; for d in \${new_dhcp6_domain_search}; do printf " %s" "\${d}"; done; printf "\n") >> /etc/resolv.conf
[ -n "\${new_host_name}" ] && hostname "\${new_host_name}"
exit 0
EOF
chmod 755 /sbin/dhclient-script
ln -s /bin /usr/bin
ln -s /run /var/run
:> /etc/fstab
# sshd via vsock
cat > /etc/passwd << EOF
root:x:0:0:root:/root:/bin/sh
sshd:x:100:100:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
EOF
cat > /etc/shadow << EOF
root:::0:99999:7:::
EOF
chmod 000 /etc/shadow
cat > /etc/ssh/sshd_config << EOF
Subsystem sftp internal-sftp
EOF
ssh-keygen -A
chmod 700 /root/.ssh
chmod 700 /run/sshd
# Alternative location for the priv separation dir
ln -s /run/sshd /usr/share/empty.sshd
cat > /root/.ssh/authorized_keys <<EOF
'"$(cat guest-key.pub 2>/dev/null || :)"'
EOF
chmod 600 /root/.ssh/authorized_keys
chmod 700 /root
socat VSOCK-LISTEN:22,fork EXEC:"/sbin/sshd -i -e" 2> /var/log/vsock-ssh.log &
sh +m
'
OUTPUT="KERNEL=__KERNEL__
INITRD=__INITRD__
"
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