unix-privesc-check/lib/checks/system_libraries

#!/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 system libraries and their
# parent directories

. lib/misc/file
. lib/misc/group
. lib/misc/linker
. lib/misc/permission
. lib/misc/stdio
. lib/misc/user

system_libraries_init () {
	stdio_message_log "system_libraries" "Starting at: `date`"
}

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

system_libraries_traverse () {
	systemfilename="${1}"
	file_parent_traverse "${systemfilename}" | while read filepath
	do
		file_show_non_symlink_perms " ${filepath}$" | while read filename permissions userid groupid
		do
			system_libraries_permissions "${filename}" "${permissions}" "${userid}" "${groupid}" "${systemfilename}"
		done
	done
}

system_libraries_wrapper () {
	systemfilename="${1}"
	file_show_non_symlink_perms " ${systemfilename}" | while read filename permissions userid groupid
	do
		system_libraries_permissions "${filename}" "${permissions}" "${userid}" "${groupid}" "${systemfilename}"
	done
	system_libraries_traverse "${systemfilename}"
}

system_libraries_main () {
	linker_list_system_filenames | while read filename
	do
		if [ ! -e "${filename}" ]
		then
			stdio_message_warn "system_libraries" "${filename} does not exist, checking parent path directories' permissions"
			system_libraries_traverse "${filename}"
			continue
		fi

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

			if [ -e "${linkedfilename}" ]
			then
				#stdio_message_debug "system_libraries" "${filename} is a symlink to ${linkedfilename}"
				system_libraries_wrapper "${linkedfilename}"
			fi
		else
			system_libraries_wrapper "${filename}"
		fi
	done
}

system_libraries_fini () {
	stdio_message_log "system_libraries" "Ending at: `date`"
}