SWAMPy

✎ CARVE FLESH

EDITING: sendmail

#!/bin/bash
##CageFS proxyexec wrapper - ver 18

if [[ $EUID -eq 0 ]]; then
    echo 'Cannot be run as root'
    exit 1
fi

USR=`/usr/bin/whoami`
USER_TOKEN_PATH="/var/.cagefs/.cagefs.token"
WEBSITE_ISOLATION_FLAG="/opt/cloudlinux/flags/enabled-flags.d/website-isolation.flag"
# Trust boundary for the website-isolation token path: it must point
# directly at the regular file that create_website_token_directory()
# creates inside its root-owned per-user storage area. That area is
# /var/cagefs/<prefix>/<user>/.cagefs/website/... on the host and is
# bind-mounted into the cage at /var/.cagefs/website/... — both views
# are accepted because libenter.enter_site() picks one or the other
# depending on whether it runs inside or outside the cage. The file
# itself is never a symlink, so we reject symlinks outright rather
# than canonicalizing with realpath. Without this gate the attacker
# controls both the env var WEBSITE_TOKEN_PATH and the file contents
# at that path; the file contents land in $TOKEN, which is embedded
# into the ssh remote command argv below and re-parsed by the remote
# shell — so shell metacharacters in the file would execute on the
# origin host. (Slite #7 / CLOS-4490)
if [[ -f "$WEBSITE_ISOLATION_FLAG" && -n "$WEBSITE_TOKEN_PATH" ]]; then
    if [[ -L "$WEBSITE_TOKEN_PATH" ]]; then
        echo "cagefs.proxy: WEBSITE_TOKEN_PATH '$WEBSITE_TOKEN_PATH' must not be a symlink" >&2
        exit 1
    fi
    if [[ ! -f "$WEBSITE_TOKEN_PATH" ]]; then
        echo "cagefs.proxy: WEBSITE_TOKEN_PATH '$WEBSITE_TOKEN_PATH' is not an existing regular file" >&2
        exit 1
    fi
    # Reject `..` as a path component so the prefix check below cannot
    # be bypassed via traversal (e.g. /var/cagefs/../etc/passwd matches
    # the /var/cagefs/* glob but resolves outside the trusted area).
    case "$WEBSITE_TOKEN_PATH" in
        */../*|*/..)
            echo "cagefs.proxy: WEBSITE_TOKEN_PATH '$WEBSITE_TOKEN_PATH' must not contain '..' path components" >&2
            exit 1
            ;;
    esac
    case "$WEBSITE_TOKEN_PATH" in
        /var/cagefs/*|/var/.cagefs/*) ;;
        *)
            echo "cagefs.proxy: WEBSITE_TOKEN_PATH must be under /var/cagefs/ or /var/.cagefs/ (got '$WEBSITE_TOKEN_PATH')" >&2
            exit 1
            ;;
    esac
    USER_TOKEN_PATH="$WEBSITE_TOKEN_PATH"
fi
# The -L/-f/prefix gate above is defense-in-depth, TOCTOU is not exploitable because the
# forwarded $TOKEN must still equal the legit on-disk bytes that the
# origin's cagefs.server reads with open(..., O_NOFOLLOW) from a
# uid-derived path (see find_website_by_token() in
# proxyexec/cagefs.server.c) — a swapped symlink redirects what we
# cat, never what the server reads, so a TOCTOU substitution can only
# replace the forwarded bytes with something that fails the server's
# constant-time comparison.
TOKEN=`/bin/cat ${USER_TOKEN_PATH}`
# Tokens are generated as fixed-length alphanumerics by
# _generate_password() in py/clcagefslib/webisolation/jail_utils.py and
# by the corresponding C helper. Any non-alphanumeric byte means the
# token file was tampered with — refuse to forward it into the ssh
# remote command, where the remote shell would re-parse metacharacters.
# Use POSIX `case` rather than `[[ =~ ]]` because the wrapper is also
# invoked through `sh` (e.g. jenkins_tests/rpm_tests/p_cagefs/
# 939-environment_var-check.sh), and dash treats `[[` as a missing
# command — the regex form would falsely trip and exit the script.
case "$TOKEN" in
    "" | *[!A-Za-z0-9]*)
        echo "cagefs.proxy: refusing to forward malformed token from $USER_TOKEN_PATH" >&2
        exit 1
        ;;
esac
# It's user's tmp directory and write to it is secure procedure
# because this script is running only under usual user
PIDFILE="/tmp/.cagefs.proxy.$$"
USER_INTERRUPT=13
CWD=`pwd`

ctrl_c_handler() {
    if [[ -f "$PIDFILE" ]]; then
        pid=`/bin/cat $PIDFILE`
        /bin/rm -f $PIDFILE > /dev/null 2>&1
        /bin/kill -s SIGINT "$pid" > /dev/null 2>&1
    fi
    exit $USER_INTERRUPT
}

if [[ -e /var/.cagefs/origin ]]; then
    ORIGIN=`/bin/cat /var/.cagefs/origin`
    REMOTE="/usr/bin/ssh -F /etc/ssh/cagefs-rexec_config $USR@$ORIGIN"
    $REMOTE CAGEFS_TOKEN="$TOKEN" /usr/sbin/proxyexec -c cagefs.sock "$USR" "$CWD" SENDMAIL $$ "$@"
    RETVAL=$?
else
    trap 'ctrl_c_handler' 2
    CAGEFS_TOKEN="$TOKEN" /usr/sbin/proxyexec -c cagefs.sock "$USR" "$CWD" SENDMAIL $$ "$@"
    RETVAL=$?
    /bin/rm -f $PIDFILE > /dev/null 2>&1
fi

exit $RETVAL

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📁 .build-id/	DIR	—	2026-11-03 12:01
📁 binfmt.d/	DIR	—	2026-09-04 03:32
📁 debug/	DIR	—	2024-08-19 17:42
📁 dracut/	DIR	—	2026-08-14 22:52
📁 environment.d/	DIR	—	2026-09-04 22:52
📁 exim/	DIR	—	2025-02-14 06:48
📁 firewalld/	DIR	—	2024-08-19 17:45
📁 firmware/	DIR	—	2026-10-02 12:16
📁 fontconfig/	DIR	—	2024-08-19 17:45
📁 games/	DIR	—	2021-10-09 08:49
📁 gcc/	DIR	—	2026-10-26 11:05
📁 grub/	DIR	—	2026-08-10 13:11
📁 kbd/	DIR	—	2026-10-08 10:02
📁 kcare/	DIR	—	2026-10-22 22:55
📁 kdump/	DIR	—	2026-02-12 22:54
📁 kernel/	DIR	—	2026-09-04 03:32
📁 locale/	DIR	—	2026-10-13 08:02
📁 modprobe.d/	DIR	—	2026-09-04 22:52
📁 modules/	DIR	—	2026-08-04 22:38
📁 modules-load.d/	DIR	—	2026-10-26 22:54
📁 motd.d/	DIR	—	2026-08-18 13:12
📁 NetworkManager/	DIR	—	2026-08-24 06:01
📁 node_modules/	DIR	—	2021-03-10 14:47
📁 polkit-1/	DIR	—	2026-09-09 22:53
📁 python2.7/	DIR	—	2025-02-14 06:48
📁 python3.12/	DIR	—	2026-10-07 05:00
📁 python3.6/	DIR	—	2026-10-19 17:11
📁 python3.8/	DIR	—	2025-02-17 05:48
📁 rpm/	DIR	—	2026-10-28 22:52
📁 sse2/	DIR	—	2021-10-09 08:49
📁 sysctl.d/	DIR	—	2026-09-14 22:52
📁 sysimage/	DIR	—	2021-10-09 08:49
📁 systemd/	DIR	—	2026-09-04 22:52
📁 sysusers.d/	DIR	—	2026-09-04 22:52
📁 tmpfiles.d/	DIR	—	2026-11-04 22:53
📁 tuned/	DIR	—	2026-09-28 22:52
📁 udev/	DIR	—	2026-09-04 22:52
📄 cpp	?	1.2 MB	2026-10-26 11:10	EDIT
📄 os-release	?	381 B	2026-08-17 11:46	EDIT
📄 sendmail	?	4.4 KB	2026-09-21 22:18	EDIT