isaaccladandClaude Opus 4.8
d54ae879b6
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The jail's /etc/passwd listed every hosting username (no passwords — shadow isn't in the jail — but it enumerated tenants). The launcher now binds a per-session /etc/passwd|group (root + the current user only) inside each session's mount namespace, and the shared jail passwd no longer carries hosting users. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
33 lines
1.6 KiB
Bash
Executable File
33 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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# Ladill jailed shell for the hosting browser terminal. Per session (private mount
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# ns): /home holds only this user's dir, and /etc/passwd|group expose only root +
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# this user. The customer can never see other tenants, the host fs, or secrets.
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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 "$U" ] || { echo 'usage: ladill-jailsh <user> [relpath]'; exit 2; }
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UID_=$(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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if [ -z "${LADILL_JAIL_NS:-}" ]; then
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exec env LADILL_JAIL_NS=1 unshare --mount --propagation private -- "$0" "$U" "$REL"
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fi
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# /home with only this user's directory
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mount -t tmpfs -o mode=0755,nosuid,nodev tmpfs "$JAIL/home"
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mkdir -p "$JAIL/home/$U"
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mount --bind "$HOMEDIR" "$JAIL/home/$U"
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# passwd/group exposing only root + this user (no tenant enumeration)
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mount -t tmpfs -o mode=0755,nosuid,nodev tmpfs "$JAIL/run"
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{ echo 'root:x:0:0:root:/root:/bin/bash'; getent passwd "$U"; } > "$JAIL/run/passwd"
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{ echo 'root:x:0:'; getent group "$U"; } > "$JAIL/run/group"
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mount --bind "$JAIL/run/passwd" "$JAIL/etc/passwd"
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mount --bind "$JAIL/run/group" "$JAIL/etc/group"
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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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