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security: disable password auth for root and ubuntu #2161

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Merged
lowjoel merged 2 commits into from
May 22, 2026
Merged

security: disable password auth for root and ubuntu #2161

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f34ee5e
security: remove passwords for root and ubuntu
lowjoel May 21, 2026
2ab30c5
fix: ensure Password and Challenge Response auth for SSH is disabled
lowjoel May 21, 2026
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13 changes: 13 additions & 0 deletions ebssurrogate/scripts/qemu-bootstrap-nix.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,19 @@ function clean_system {
rm -rf /root/.vpython*
rm -rf /root/go
rm -rf /mnt/usr/share/doc

# remove passwords in user-data-cloudimg.img (required for Packer login)
usermod -p '*' ubuntu
usermod -p '*' root

# Ensure that PasswordAuthentication is off
# From chroot-boostrap-nix.sh
sed -i -E \
-e 's/^#?\s*PasswordAuthentication\s+(yes|no)\s*$/PasswordAuthentication no/g' \
-e 's/^#?\s*ChallengeResponseAuthentication\s+(yes|no)\s*$/ChallengeResponseAuthentication no/g' \
/etc/ssh/sshd_config
grep -qE "^PasswordAuthentication\s+no" /etc/ssh/sshd_config \
|| { echo "ERROR: PasswordAuthentication is not disabled in sshd_config"; exit 1; }
}

install_nix
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