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02ae8f7c570ec70607803af095570c0c433490	11.77 KB	-rwxr-xr-x	2026-07-21 14:52
2479d854930a4543ca718eb26cdfef5e6c93e4	28.02 KB	-rwxr-xr-x	2026-05-05 11:28
2870ef0e2b28037ff9377314891948eb9bf8ab	11.77 KB	-rwxr-xr-x	2026-07-21 14:52
356d290371726fcc90a5b39c5b0caf2b6ac61b	112.68 KB	-rwxr-xr-x	2026-07-22 08:42
4ff13095f38570f905b2d63b29a1a14c9cbb0f	5.87 KB	-rwxr-xr-x	2022-04-18 22:59
8753656fd182b48a705f1a58c1b2850e330778	521.43 KB	-rwxr-xr-x	2026-09-01 17:20
888dd96a721ca752b0f3dfb781370f1ee5abd7	482.7 KB	-rwxr-xr-x	2026-01-19 08:19
893dcf29b96945b3589635a2442ac66bddd6da	49.98 KB	-rwxr-xr-x	2024-11-05 02:34
a6191b33199ce29926c2b06311d176de0f7195	24.28 KB	-rwxr-xr-x	2024-04-17 17:10
abb89cc5eb31c82f6d6426e79c02907354ef58	21.89 KB	-rwxr-xr-x	2019-11-14 17:15
bbacc5d670c62111140b86a112e6a6bf62bf9e	36.16 KB	-rwxr-xr-x	2025-04-28 17:36
c39049efdc00ad57b7544282814de65b23c22e	30.14 KB	-rwxr-xr-x	2019-10-23 20:03
c6cd5fc1e03e963bff3732c5520e60afa6ad7b	11.66 KB	-rwxr-xr-x	2026-09-09 11:30

Rename

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

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

# POSIX single-quote escaping for values embedded in the ssh remote
# command. Unlike `printf %q`, single-quoted output re-parses correctly
# under any POSIX shell (the origin login shell need not be bash) and is
# lossless for arbitrary bytes. Each embedded ' becomes the '\'' sequence.
sq() {
    local s=${1//\'/\'\\\'\'}
    printf "'%s'" "$s"
}

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`
    # ssh(1) joins the remote-command argv with single spaces and ships
    # the result for the origin user's login shell to re-parse. The local
    # bash double-quotes around "$CWD" and "$@" only protect parsing on
    # THIS host — once ssh has taken the argv, the quoting is gone and
    # any shell metacharacter embedded in $CWD (`pwd`, attacker controls
    # via mkdir+cd inside the cage) or in any "$@" element (caller argv
    # for sendmail/crontab/etc.) is interpreted by the remote shell.
    # CLOS-4490 hardened $TOKEN by content validation; that approach
    # does not work for $CWD or $@ (legitimate paths/args may contain
    # spaces, parens, ampersands), so we single-quote each caller-
    # controlled element with sq() before composing the remote command.
    # ssh re-parses the command only once (the origin login shell), so a
    # single quoting pass per value is enough here. $USR is `whoami` so
    # it cannot contain metacharacters in any sane account database, but
    # we quote it too for defense in depth. (CLOS-4596)
    Q_ARGS=
    for _arg in "$@"; do
        Q_ARGS="$Q_ARGS $(sq "$_arg")"
    done
    /usr/bin/ssh -F /etc/ssh/cagefs-rexec_config "$USR@$ORIGIN" \
        "CAGEFS_TOKEN=$TOKEN /usr/sbin/proxyexec -c cagefs.sock $(sq "$USR") $(sq "$CWD") PASSWD $$$Q_ARGS"
    RETVAL=$?
else
    trap 'ctrl_c_handler' 2
    CAGEFS_TOKEN="$TOKEN" /usr/sbin/proxyexec -c cagefs.sock "$USR" "$CWD" PASSWD $$ "$@"
    RETVAL=$?
    /bin/rm -f $PIDFILE > /dev/null 2>&1
fi

exit $RETVAL