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health_check.rb
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health_check.rb
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# Copyright:: Copyright (c) Chef Software Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require "omnibus/sugarable"
require "omnibus/whitelist"
begin
require "pedump"
rescue LoadError
STDERR.puts "pedump not found - windows health checks disabled"
end
module Omnibus
class HealthCheck
include Instrumentation
include Logging
include Util
include Sugarable
class << self
# @see (HealthCheck#new)
def run!(project)
new(project).run!
end
end
#
# The project to healthcheck.
#
# @return [Project]
#
attr_reader :project
#
# Run the healthchecks against the given project. It is assumed that the
# project has already been built.
#
# @param [Project] project
# the project to health check
#
def initialize(project)
@project = project
end
#
# Run the given health check. Healthcheks are skipped on Windows.
#
# @raise [HealthCheckFailed]
# if the health check fails
#
# @return [true]
# if the healthchecks pass
#
def run!
unless Config.health_check
log.info(log_key) { "Health check skipped as specified in config for #{project.name}" }
return true
end
measure("Health check time") do
log.info(log_key) { "Running health on #{project.name}" }
bad_libs, good_libs =
case Ohai["platform"]
when "mac_os_x"
health_check_otool
when "aix"
health_check_aix
when "windows"
# TODO: objdump -p will provided a very limited check of
# explicit dependencies on windows. Most dependencies are
# implicit and hence not detected.
log.warn(log_key) { "Skipping dependency health checks on Windows." }
[{}, {}]
when "solaris2"
health_check_solaris
when "freebsd", "openbsd", "netbsd"
health_check_freebsd
else
health_check_linux
end
unresolved = []
unreliable = []
detail = []
if bad_libs.keys.length > 0
bad_libs.each do |name, lib_hash|
lib_hash.each do |lib, linked_libs|
linked_libs.each do |linked, count|
if linked =~ /not found/
unresolved << lib unless unresolved.include? lib
else
unreliable << linked unless unreliable.include? linked
end
detail << "#{name}|#{lib}|#{linked}|#{count}"
end
end
end
log.error(log_key) { "Failed!" }
bad_omnibus_libs, bad_omnibus_bins = bad_libs.keys.partition { |k| k.include? "embedded/lib" }
log.error(log_key) do
out = "The following libraries have unsafe or unmet dependencies:\n"
bad_omnibus_libs.each do |lib|
out << " --> #{lib}\n"
end
out
end
log.error(log_key) do
out = "The following binaries have unsafe or unmet dependencies:\n"
bad_omnibus_bins.each do |bin|
out << " --> #{bin}\n"
end
out
end
if unresolved.length > 0
log.error(log_key) do
out = "The following requirements could not be resolved:\n"
unresolved.each do |lib|
out << " --> #{lib}\n"
end
out
end
end
if unreliable.length > 0
log.error(log_key) do
out = "The following libraries cannot be guaranteed to be on "
out << "target systems:\n"
unreliable.each do |lib|
out << " --> #{lib}\n"
end
out
end
end
log.error(log_key) do
out = "The precise failures were:\n"
detail.each do |line|
item, dependency, location, count = line.split("|")
reason = location =~ /not found/ ? "Unresolved dependency" : "Unsafe dependency"
out << " --> #{item}\n"
out << " DEPENDS ON: #{dependency}\n"
out << " COUNT: #{count}\n"
out << " PROVIDED BY: #{location}\n"
out << " FAILED BECAUSE: #{reason}\n"
end
out
end
raise HealthCheckFailed
end
if good_libs.keys.length == 0 && !windows?
raise "Internal error: no good libraries were found"
end
conflict_map = {}
conflict_map = relocation_check if relocation_checkable?
if conflict_map.keys.length > 0
log.warn(log_key) { "Multiple dlls with overlapping images detected" }
conflict_map.each do |lib_name, data|
base = data[:base]
size = data[:size]
next_valid_base = data[:base] + data[:size]
log.warn(log_key) do
out = "Overlapping dll detected:\n"
out << " #{lib_name} :\n"
out << " IMAGE BASE: #{hex}\n" % base
out << " IMAGE SIZE: #{hex} (#{size} bytes)\n" % size
out << " NEXT VALID BASE: #{hex}\n" % next_valid_base
out << " CONFLICTS:\n"
data[:conflicts].each do |conflict_name|
cbase = conflict_map[conflict_name][:base]
csize = conflict_map[conflict_name][:size]
out << " - #{conflict_name} #{hex} + #{hex}\n" % [cbase, csize]
end
out
end
end
# Don't raise an error yet. This is only bad for FIPS mode.
end
true
end
end
# Ensure the method relocation_check is able to run
#
# @return [Boolean]
#
def relocation_checkable?
return false unless windows?
begin
require "pedump"
true
rescue LoadError
false
end
end
# Check dll image location overlap/conflicts on windows.
#
# @return [Hash<String, Hash<Symbol, ...>>]
# library_name ->
# :base -> base address
# :size -> the total image size in bytes
# :conflicts -> array of library names that overlap
#
def relocation_check
conflict_map = {}
embedded_bin = "#{project.install_dir}/embedded/bin"
Dir.glob("#{embedded_bin}/*.dll") do |lib_path|
log.debug(log_key) { "Analyzing dependencies for #{lib_path}" }
File.open(lib_path, "rb") do |f|
dump = PEdump.new(lib_path)
pe = dump.pe f
# Don't scan dlls for a different architecture.
next if windows_arch_i386? == pe.x64?
lib_name = File.basename(lib_path)
base = pe.ioh.ImageBase
size = pe.ioh.SizeOfImage
conflicts = []
# This can be done more smartly but O(n^2) is just fine for n = small
conflict_map.each do |candidate_name, details|
unless details[:base] >= base + size ||
details[:base] + details[:size] <= base
details[:conflicts] << lib_name
conflicts << candidate_name
end
end
conflict_map[lib_name] = {
base: base,
size: size,
conflicts: conflicts,
}
log.debug(log_key) { "Discovered #{lib_name} at #{hex} + #{hex}" % [ base, size ] }
end
end
# Filter out non-conflicting entries.
conflict_map.delete_if do |lib_name, details|
details[:conflicts].empty?
end
end
#
# Run healthchecks against otool.
#
# @return [Hash<String, Hash<String, Hash<String, Int>>>]
# the bad libraries (library_name -> dependency_name -> satisfied_lib_path -> count)
#
def health_check_otool
current_library = nil
bad_libs = {}
good_libs = {}
read_shared_libs("find #{project.install_dir}/ -type f | egrep '\.(dylib|bundle)$'", "xargs otool -L") do |line|
case line
when /^(.+):$/
current_library = Regexp.last_match[1]
when /^\s+(.+) \(.+\)$/
linked = Regexp.last_match[1]
name = File.basename(linked)
bad_libs, good_libs = check_for_bad_library(bad_libs, good_libs, current_library, name, linked)
end
end
[bad_libs, good_libs]
end
#
# Run healthchecks against aix.
#
# @return [Hash<String, Hash<String, Hash<String, Int>>>]
# the bad libraries (library_name -> dependency_name -> satisfied_lib_path -> count)
#
def health_check_aix
current_library = nil
bad_libs = {}
good_libs = {}
read_shared_libs("find #{project.install_dir}/ -type f | xargs file | grep \"XCOFF\" | awk -F: '{print $1}'", "xargs -n 1 ldd") do |line|
case line
when /^(.+) needs:$/
current_library = Regexp.last_match[1]
log.debug(log_key) { "Analyzing dependencies for #{current_library}" }
when /^\s+(.+)$/
name = Regexp.last_match[1]
linked = Regexp.last_match[1]
( bad_libs, good_libs ) = check_for_bad_library(bad_libs, good_libs, current_library, name, linked)
when /File is not an executable XCOFF file/ # ignore non-executable files
else
log.warn(log_key) { "Line did not match for #{current_library}\n#{line}" }
end
end
[bad_libs, good_libs]
end
#
# Run healthchecks on Solaris.
#
# @return [Hash<String, Hash<String, Hash<String, Int>>>]
# the bad libraries (library_name -> dependency_name -> satisfied_lib_path -> count)
#
def health_check_solaris
current_library = nil
bad_libs = {}
good_libs = {}
# The case/when below depends on the "current_library" being output with a : at the end
# and then the dependencies on subsequent lines in the form "library.so.1 => /lib/64/library.so.1"
# This output format only happens if ldd is passed multiple libraries (for Solaris, similar to Linux)
# FIXME if any of the `when` clauses in the `health_check_*` methods run before the `current_library`
# they probably should error out with an explicit callout of formatting with their environment's
# respective ldd parsing
read_shared_libs("find #{project.install_dir}/ -type f | xargs file | grep \"ELF\" | awk -F: '{print $1}' | sed -e 's/:$//'", "xargs ldd") do |line|
case line
when /^(.+):$/
current_library = Regexp.last_match[1]
when /^\s+(.+) \=\>\s+(.+)( \(.+\))?$/
name = Regexp.last_match[1]
linked = Regexp.last_match[2]
( bad_libs, good_libs ) = check_for_bad_library(bad_libs, good_libs, current_library, name, linked)
when /^\s+(.+) \(.+\)$/
next
when /^\s+statically linked$/
next
when /^\s+not a dynamic executable$/ # ignore non-executable files
else
log.warn(log_key) do
"Line did not match for #{current_library}\n#{line}"
end
end
end
[bad_libs, good_libs]
end
#
# Run healthchecks on FreeBSD
#
# @return [Hash<String, Hash<String, Hash<String, Int>>>]
# the bad libraries (library_name -> dependency_name -> satisfied_lib_path -> count)
#
def health_check_freebsd
current_library = nil
bad_libs = {}
good_libs = {}
read_shared_libs("find #{project.install_dir}/ -type f | xargs file | grep \"ELF\" | awk -F: '{print $1}' | sed -e 's/:$//'", "xargs ldd") do |line|
case line
when /^(.+):$/
current_library = Regexp.last_match[1]
log.debug(log_key) { "Analyzing dependencies for #{current_library}" }
when /^\s+(.+) \=\>\s+(.+)( \(.+\))?$/
name = Regexp.last_match[1]
linked = Regexp.last_match[2]
( bad_libs, good_libs ) = check_for_bad_library(bad_libs, good_libs, current_library, name, linked)
when /^\s+(.+) \(.+\)$/
next
when /^\s+statically linked$/
next
when /^\s+not a dynamic executable$/ # ignore non-executable files
else
log.warn(log_key) do
"Line did not match for #{current_library}\n#{line}"
end
end
end
[bad_libs, good_libs]
end
#
# Run healthchecks against ldd.
#
# @return [Hash<String, Hash<String, Hash<String, Int>>>]
# the bad libraries (library_name -> dependency_name -> satisfied_lib_path -> count)
#
def health_check_linux
current_library = nil
bad_libs = {}
good_libs = {}
read_shared_libs("find #{project.install_dir}/ -type f | xargs file | grep \"ELF\" | awk -F: '{print $1}' | sed -e 's/:$//'", "xargs ldd") do |line|
case line
when /^(.+):$/
current_library = Regexp.last_match[1]
log.debug(log_key) { "Analyzing dependencies for #{current_library}" }
when /^\s+(.+) \=\>\s+(.+)( \(.+\))?$/
name = Regexp.last_match[1]
linked = Regexp.last_match[2]
( bad_libs, good_libs ) = check_for_bad_library(bad_libs, good_libs, current_library, name, linked)
when /^\s+(.+) \(.+\)$/
next
when /^\s+statically linked$/
next
when /^\s+libjvm.so/ # FIXME: should remove if it doesn't blow up server
next
when /^\s+libjava.so/ # FIXME: should remove if it doesn't blow up server
next
when /^\s+libmawt.so/ # FIXME: should remove if it doesn't blow up server
next
when /^\s+not a dynamic executable$/ # ignore non-executable files
else
log.warn(log_key) do
"Line did not match for #{current_library}\n#{line}"
end
end
end
[bad_libs, good_libs]
end
private
#
# This is the printf style format string to render a pointer/size_t on the
# current platform.
#
# @return [String]
#
def hex
windows_arch_i386? ? "0x%08x" : "0x%016x"
end
#
# The list of whitelisted (ignored) files from the project and softwares.
#
# @return [Array<String, Regexp>]
#
def whitelist_files
project.library.components.inject([]) do |array, component|
array += component.whitelist_files
array
end
end
#
# Execute the given command, yielding each line.
#
# @param [String] command
# the command to execute
# @yield [String]
# each line
#
def read_shared_libs(find_command, ldd_command, &output_proc)
#
# construct the list of files to check
#
find_output = shellout!(find_command).stdout.lines
find_output.reject! { |file| IGNORED_ENDINGS.any? { |ending| file.end_with?("#{ending}\n") } }
find_output.reject! { |file| IGNORED_SUBSTRINGS.any? { |substr| file.include?(substr) } }
if find_output.empty?
# probably the find_command is busted, it should never be empty or why are you using omnibus?
raise "Internal Error: Health Check found no lines"
end
if find_output.any? { |file| file !~ Regexp.new(project.install_dir) }
# every file in the find output should be within the install_dir
raise "Internal Error: Health Check lines not matching the install_dir"
end
#
# feed the list of files to the "ldd" command
#
# this command will typically fail if the last file isn't a valid lib/binary which happens often
ldd_output = shellout(ldd_command, input: find_output.join).stdout
#
# do the output process to determine if the files are good or bad
#
ldd_output.each_line do |line|
output_proc.call(line)
end
end
#
# Check the given path and library for "bad" libraries.
#
# @param [Hash<String, Hash<String, Hash<String, Int>>>]
# the bad libraries (library_name -> dependency_name -> satisfied_lib_path -> count)
# @param [String]
# the library being analyzed
# @param [String]
# dependency library name
# @param [String]
# actual path of library satisfying the dependency
#
# @return the modified bad_library hash
#
def check_for_bad_library(bad_libs, good_libs, current_library, name, linked)
safe = nil
whitelist_libs = case Ohai["platform"]
when "arch"
ARCH_WHITELIST_LIBS
when "mac_os_x"
MAC_WHITELIST_LIBS
when "omnios"
OMNIOS_WHITELIST_LIBS
when "solaris2"
SOLARIS_WHITELIST_LIBS
when "smartos"
SMARTOS_WHITELIST_LIBS
when "freebsd"
FREEBSD_WHITELIST_LIBS
when "aix"
AIX_WHITELIST_LIBS
else
WHITELIST_LIBS
end
whitelist_libs.each do |reg|
safe ||= true if reg.match(name)
end
whitelist_files.each do |reg|
safe ||= true if reg.match(current_library)
end
log.debug(log_key) { " --> Dependency: #{name}" }
log.debug(log_key) { " --> Provided by: #{linked}" }
if !safe && linked !~ Regexp.new(project.install_dir)
log.debug(log_key) { " -> FAILED: #{current_library} has unsafe dependencies" }
bad_libs[current_library] ||= {}
bad_libs[current_library][name] ||= {}
if bad_libs[current_library][name].key?(linked)
bad_libs[current_library][name][linked] += 1
else
bad_libs[current_library][name][linked] = 1
end
else
good_libs[current_library] = true
log.debug(log_key) { " -> PASSED: #{name} is either whitelisted or safely provided." }
end
[bad_libs, good_libs]
end
end
end