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                | |\/| | / __| __/ _ \ '__|  `--. \ '_ \| | | |
                | |  | | \__ \ ||  __/ |    /\__/ / |_) | |_| |
                \_|  |_/_|___/\__\___|_|    \____/| .__/ \__, |
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                                       Bot Mister Spy V3

	

Mister Spy

#!/usr/bin/bash

# This file is part of Cockpit.
#
# Copyright (C) 2018 Red Hat, Inc.
#
# Cockpit is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Cockpit is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Cockpit; If not, see <http://www.gnu.org/licenses/>.

# Run a local bridge, web server, and browser for a particular Cockpit page.
# This is useful for integration into .desktop files, for systems which don't
# have cockpit.socket enabled. The web server and browser run in an unshared
# network namespace, and thus are totally isolated from everything else.
#
# Examples:
#   cockpit-desktop /cockpit/@localhost/system/index.html
#   cockpit-desktop network/firewall
#   cockpit-desktop users
#
# As an experimental/demo feature, the bridge can also be started on a remote
# ssh host. The host name is given as (optional) second argument, which is
# passed verbatim to ssh.
#
# Example:
#   cockpit-desktop system svr1
#   cockpit-desktop / username@svr1
set -eu

# exec_prefix= is set because the default /usr/libexec contains "${exec_prefix}"
exec_prefix="/usr"
libexecdir="/usr/libexec"

# find suitable browser, unless already set by $BROWSER
# We can't use xdg-open, it does too much magic behind the back to connect to
# existing instances (outside of our namespace) and does not allow us to reduce
# the UI, or pass options like chromium's --no-sandbox.
detect_browser()
{
    [ -z "${BROWSER:-}" ] || return 0

    # First choice, but it depends on gi.repository WebKit2, so check it
    if /usr/libexec/cockpit-client --help >/dev/null 2>/dev/null; then
        BROWSER="/usr/libexec/cockpit-client --disable-uniqueness --no-ui --external-ws"
        return 0
    fi

    for browser in chromium-browser chromium google-chrome; do
        if type $browser >/dev/null 2>&1; then
            # need to disable sandboxing in user namespace, but that already isolates
            # TODO: Find a way to disable the URL bar
            BROWSER="$browser --no-sandbox --disable-infobars"
            return 0
        fi
    done

    if type firefox >/dev/null 2>&1; then
        # TODO: Find a way to disable the privacy notice tab, via mozilla.cfg?
        # TODO: Find a way to disable the URL bar
        BROWSER="firefox --no-remote"
        return 0
    fi

    # TODO: is there a simple way to use webkitgtk?
    echo "No suitable browser found (Chromium/Chrome, or Firefox)" >&2
    exit 1
}


if [ -z "${1:-}" ]; then
    echo "Usage: $0 <Cockpit path> [ssh host]" >&2
    exit 1
fi

# Expand the commandline argument into a url
case "$1" in
    /*)
        URL_PATH="$1"
        ;;
    */)
        URL_PATH="/cockpit/@localhost/$1index.html"
        ;;
    */*)
        URL_PATH="/cockpit/@localhost/$1.html"
        ;;
    *)
        URL_PATH="/cockpit/@localhost/$1/index.html"
        ;;
esac

detect_browser

# start the bridge; this needs to run in the normal user session/namespace
coproc ${2:+ssh "$2"} cockpit-bridge
trap "kill $COPROC_PID; wait $COPROC_PID || true" EXIT INT QUIT PIPE

# start ws and browser in a detached network namespace
SCRIPT='
set -eu
# new namespaces have lo down by default
ip link set lo up >&2

# start browser in a temporary home dir, so that it does not interfere with your real one
export BROWSER_HOME=$(mktemp --directory --tmpdir cockpit.desktop.XXXXXX)

# forward parent stdin and stdout (from bridge) to cockpit-ws
# it pretty well does not matter which port we use in our own namespace, so use standard http
# disable /etc/cockpit/
XDG_CONFIG_DIRS="$BROWSER_HOME" COCKPIT_SUPERUSER="pkexec" '${COCKPIT_WS:-/usr/libexec/cockpit-ws}' -p 80 -a 127.0.0.90 --local-session=- <&0 >&1 &
WS_PID=$!
# ... and stop using that stdin/out for everything else
exec 0</dev/null
exec 1>&2

trap "set +e; kill $WS_PID; wait $WS_PID; rm -rf $BROWSER_HOME" EXIT INT QUIT PIPE

# if we have netcat, use it for waiting until ws is up
if type nc >/dev/null 2>&1; then
    for retry in `seq 10`; do
        nc -z 127.0.0.90 80 && break
        sleep 0.5;
    done
else
    # otherwise, just wait a bit
    sleep 3
fi

HOME="$BROWSER_HOME" '$BROWSER' http://127.0.0.90'"$URL_PATH"'
'
unshare --user --map-root-user --net /bin/bash -c "$SCRIPT" <&${COPROC[0]} >&${COPROC[1]}