unix-privesc-check/lib/checks/privileged_rpath

#!/bin/sh
# $Revision: 310 $
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
# (c) Tim Brown, 2012
# <mailto:timb@nth-dimension.org.uk>
# <http://www.nth-dimension.org.uk/> / <http://www.machine.org.uk/>
#
# List group-writable and world-writable privileged files (their parent
# directories too) and processes that trust other filepaths (with RPATH
# variable)

. lib/misc/binary
. lib/misc/file
. lib/misc/group
. lib/misc/permission
. lib/misc/privileged
. lib/misc/stdio
. lib/misc/user

privileged_rpath_init () {
	stdio_message_log "privileged_rpath" "Starting at: `date`"
}

privileged_rpath_permissions () {
	filename="${1}"
	permissions="${2}"
	userid="${3}"
	groupid="${4}"
	privfilename="${5}"
	filetype="${6}"
	case "${permissions}" in
		????????w?)
			if [ "`permission_is_world_writable_sticky_bit \"${permissions}\"`" -eq 1 ]
			then
				stdio_message_log "privileged_rpath" "${filetype} ${privfilename} trusts ${filename}, this is owned by user ${userid} (group ${groupid}) and is world-writable with sticky bit (${permissions})"
			else
				stdio_message_warn "privileged_rpath" "${filetype} ${privfilename} trusts ${filename}, this is owned by user ${userid} (group ${groupid}) and is world-writable (${permissions})"
			fi
			;;
		?????w????)
			if [ "`group_is_in_group_name \"${groupid}\"`" -eq 1 ]
			then
				stdio_message_warn "privileged_rpath" "${filetype} ${privfilename} trusts ${filename}, this is owned by user ${userid} (group ${groupid}: YOU) and is group-writable (${permissions})"
			else
				stdio_message_log "privileged_rpath" "${filetype} ${privfilename} trusts ${filename}, this is owned by user ${userid} (group ${groupid}) and is group-writable (${permissions})"
			fi
			;;
		??w???????)
			if [ "`user_is_user_root \"${userid}\"`" -ne 1 -a "`user_show_user_name`" = "${userid}" ]
			then
				stdio_message_debug "privileged_rpath" "${filetype} ${privfilename} trusts ${filename}, this is owned by user ${userid} (YOU) (group ${groupid}), non-root user (${permissions})"
			elif [ "`user_is_user_root \"${userid}\"`" -ne 1 ]
			then
				stdio_message_log "privileged_rpath" "${filetype} ${privfilename} trusts ${filename}, this is owned by user ${userid} (group ${groupid}), non-root user (${permissions})"
			fi
			;;
	esac
}

privileged_rpath_wrapper () {
	origfilepath="${1}"
	privfilename="${2}"
	filetype="${3}"
	file_parent_traverse "${origfilepath}" | while read filepath
	do
		file_show_non_symlink_perms " ${filepath}$" | while read filename permissions userid groupid
		do
			privileged_rpath_permissions "${filename}" "${permissions}" "${userid}" "${groupid}" "${privfilename}" "${filetype}"
		done
	done
}

privileged_rpath_main () {
	privileged_list | while read filetype filename usergroupid
	do
		binary_list_rpath "${filename}" | while read filepath
		do
			if [ -z "${filepath}" ]
			then
				continue
			# relative paths always end up at . with dirname
			elif [ "${filepath}" = "." -o "`printf -- \"${filepath}\" | egrep -- \"ORIGIN\"`" ]
			then
				stdio_message_warn "privileged_rpath" "${filetype} ${filename} trusts ${filepath} and this is relative"
				continue
			elif [ ! -e "${filepath}" ]
			then
				stdio_message_warn "privileged_rpath" "${filetype} ${filename} trusts ${filepath}, but this does not exist"
				continue
			fi

			if [ -h "${filepath}" ]
			then
				linkedfilename="`file_show_symlinked_filename "${filepath}"`"

				if [ -n "${linkedfilename}" ]
				then
					#stdio_message_debug "privileged_rpath" "${filetype} ${filename} trusts ${filepath}, a symlink to ${linkedfilename}"
					privileged_rpath_wrapper "${linkedfilename}" "${filename}" "${filetype}"
				fi
			else
				privileged_rpath_wrapper "${filepath}" "${filename}" "${filetype}"
			fi
		done
	done
}

privileged_rpath_fini () {
	stdio_message_log "privileged_rpath" "Ending at: `date`"
}