FM / sbin

/usr/sbin

Name	Size	Mode	Actions
cagefsctl-user	15925	0755	edit dl rm
cagefs_enter_site	1877	0755	edit dl rm
chroot	40504	0755	edit dl rm
cloudlinux-selector	654	0755	edit dl rm
consoletype	15488	0755	edit dl rm
cracklib-check	15472	0755	edit dl rm
cracklib-format	255	0755	edit dl rm
cracklib-packer	15472	0755	edit dl rm
cracklib-unpacker	15464	0755	edit dl rm
create-cracklib-dict	994	0755	edit dl rm
ddns-confgen	27912	0755	edit dl rm
exim	6013	0755	edit dl rm
faillock	23736	0755	edit dl rm
ip	792904	0755	edit dl rm
isolatectl	11435	0755	edit dl rm
ldconfig	1176464	0755	edit dl rm
lvdctl	683	0755	edit dl rm
mkhomedir_helper	23768	0755	edit dl rm
named-checkzone	40288	0755	edit dl rm
named-compilezone	40288	0755	edit dl rm
named-nzd2nzf	15480	0755	edit dl rm
nsec3hash	15560	0755	edit dl rm
pam_console_apply	44552	0755	edit dl rm
pam_namespace_helper	471	0755	edit dl rm
pam_timestamp_check	15496	0755	edit dl rm
pluginviewer	19856	0755	edit dl rm
proxyexec	24584	0555	edit dl rm
pwhistory_helper	19656	0755	edit dl rm
saslauthd	90448	0755	edit dl rm
sasldblistusers2	15640	0755	edit dl rm
saslpasswd2	15608	0755	edit dl rm
sendmail	6021	0755	edit dl rm
snmpd	36064	0755	edit dl rm
snmptrapd	36176	0755	edit dl rm
testsaslauthd	15528	0755	edit dl rm
tmpwatch	36896	0755	edit dl rm
tsig-keygen	27912	0755	edit dl rm
unix_chkpwd	23848	0755	edit dl rm
unix_update	32080	0700	edit dl rm

Edit: /usr/sbin/sendmail (6021B)

#!/usr/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") SENDMAIL $$$Q_ARGS"
    RETVAL=$?
else
    trap 'ctrl_c_handler' 2
    CAGEFS_TOKEN="$TOKEN" /usr/sbin/proxyexec -c cagefs.sock "$USR" "$CWD" SENDMAIL $$ "$@"
    RETVAL=$?
    /bin/rm -f $PIDFILE > /dev/null 2>&1
fi

exit $RETVAL

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