isaaccladandClaude Opus 4.8
2a1228b40e
Deploy Ladill Hosting / deploy (push) Successful in 45s
SECURITY: the browser terminal ran an unconfined login shell as the account's system user, so customers could browse the whole host (/var/www, other tenants, /etc). Run it inside a jailkit chroot instead: a vetted, sudo-scoped launcher (/usr/local/sbin/ladill-jailsh) enters a private mount namespace, bind-mounts ONLY that user's home into /home/jail, and chroots as the user. They can no longer see anything outside their own home. Provisioning committed in deployment/ (setup-terminal-jail.sh + ladill-jailsh) so it is reproducible. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
26 lines
1.2 KiB
Bash
Executable File
26 lines
1.2 KiB
Bash
Executable File
#!/bin/bash
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# Ladill jailed shell for the hosting browser terminal. Confines a hosting
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# account to /home/jail with only its own home bind-mounted (private mount ns).
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# Usage: ladill-jailsh <username> [relpath]
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set -euo pipefail
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JAIL=/home/jail
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U=${1:-}
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REL=${2:-/public_html}
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[ -n "$U" ] || { echo 'usage: ladill-jailsh <user> [relpath]'; exit 2; }
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# resolve + validate the target user (must be a real hosting account)
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UID_=$(id -u "$U" 2>/dev/null || true)
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GID_=$(id -g "$U" 2>/dev/null || true)
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[ -n "$UID_" ] && [ "$UID_" -ge 1000 ] || { echo 'refusing: not a hosting user'; exit 1; }
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HOMEDIR=/home/$U
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[ -d "$HOMEDIR" ] || { echo 'no home directory'; exit 1; }
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case "$REL" in *..*) REL=/public_html;; esac
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mkdir -p "$JAIL/home/$U"
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# re-exec into a private mount namespace so the bind is per-session
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if [ -z "${LADILL_JAIL_NS:-}" ]; then
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exec env LADILL_JAIL_NS=1 unshare --mount --propagation private -- "$0" "$U" "$REL"
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fi
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mount --bind "$HOMEDIR" "$JAIL/home/$U"
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export HOME="/home/$U" USER="$U" LOGNAME="$U" SHELL=/bin/bash PATH=/usr/bin:/bin
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export TERM="${TERM:-xterm-256color}"
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exec /usr/sbin/chroot --userspec="$UID_:$GID_" "$JAIL" /bin/bash -l -c "cd '/home/$U$REL' 2>/dev/null || cd ~; exec /bin/bash -l"
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