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|
#!/usr/bin/env python
# kernel-check -- Gentoo Kernel Security
# Copyright 2009-2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import inspect
import mmap
import os
import portage
import re
import xml.etree.cElementTree
ARCHES = [
'all', 'alpha', 'amd64', 'amd64-fbsd', 'arm', 'hppa', 'ia64', 'm68k',
'mips', 'ppc', 'ppc64', 's390', 'sh', 'sparc', 'sparc-fbsd', 'x86',
'x86-fbsd'
]
REGEX = {
'argument' : re.compile(r'(CVE-(\d{4})-(\d{4}))|(\d{5,7})'),
'gp_version' : re.compile(r'(?<=K_GENPATCHES_VER\=\").+(?=\")'),
'gp_want' : re.compile(r'(?<=K_WANT_GENPATCHES\=\").+(?=\")'),
'k_version' : re.compile(r'^((?:\d{1,2}\.){0,4}\d{1,2})(-.*)?$'),
'rc_kernel' : re.compile(r'^rc\d{1,3}$'),
'git_kernel' : re.compile(r'^git(\d{1,3})$'),
'r_kernel' : re.compile(r'^r\d{1,3}$')
}
SUPPORTED = ['gentoo', 'vanilla', 'hardened']
KERNEL_TYPES = [
'aa', 'acpi', 'ac', 'alpha', 'arm', 'as', 'cell', 'ck', 'compaq', 'crypto',
'development', 'gaming','gentoo-dev', 'gentoo', 'gentoo-test', 'gfs',
'git', 'grsec', 'gs', 'hardened-dev', 'hardened', 'hppa-dev', 'hppa',
'ia64', 'kurobox', 'linux', 'lolo', 'mips-prepatch', 'mips', 'mjc', 'mm',
'mosix', 'openblocks', 'openmosix','openvz', 'pac', 'pegasos-dev',
'pegasos', 'pfeifer', 'planet-ccrma', 'ppc64', 'ppc-development',
'ppc-dev', 'ppc', 'redhat', 'rsbac-dev', 'rsbac', 'selinux', 'sh',
'sparc-dev', 'sparc', 'suspend2', 'systrace', 'tuxonice', 'uclinux',
'usermode', 'vanilla-prepatch', 'vanilla', 'vanilla-tiny', 'vserver-dev',
'vserver', 'win4lin', 'wolk-dev', 'wolk', 'xbox', 'xen', 'xfs'
]
VERSION = '0.3.15'
DEBUG = False
PORTDIR = portage.settings['PORTDIR']
KERNELDIR = os.path.join(PORTDIR, 'metadata', 'kernel')
def BUG_ON(msg, e):
if DEBUG:
print('[DEBUG] line %s in %s(): %s -> %s' % (inspect.stack()[1][2],
inspect.stack()[1][3], msg, e))
class Evaluation:
"""Evaluation class
Provides information about the vulnerability of a kernel.
"""
read = int()
arch = int()
affected = list()
unaffected = list()
avg_cvss = float()
low = int()
medium = int()
high = int()
def __init__(self):
self.affected = list()
self.unaffected = list()
def __repr__(self):
severity = str()
if self.high is not 0:
severity += '%s high' % self.high
if self.medium is not 0:
if self.high is not 0:
severity += ', '
severity += '%s medium' % self.medium
if self.low is not 0:
if self.high is not 0 or self.medium is not 0:
severity += ', '
severity += '%s low' % self.low
return severity
class Comparison: #TODO Check if deprecated
"""Comparison class
"""
fixed = int()
new = list()
#TODO add more information
def __init__(self):
self.fixed = list()
self.new = list()
class Cve:
"""Common vulnerabilities and exposures class
Contains all important information about a cve.
Attributes:
cve: a string represeting the cve number of the class.
desc: a string providing a detailed description for the cve.
published: a string representing the original cve release date.
refs: a list of external references.
severity: a string representing the cve severity.
score: a floating point representing cvss base score.
vector: a string providing the cve access vector.
"""
cve = str()
desc = str()
published = str()
refs = list()
severity = str()
score = float()
vector = str()
def __init__(self, cve):
self.cve = cve
def __eq__(self, diff):
return (self.cve == diff.cve) #FIXME is this enough?
def __ne__(self, diff):
return not self.__eq__(diff)
class Genpatch:
'Genpatch class'
base = bool()
extras = bool()
kernel = None
version = str()
def __init__(self, version):
self.version = version
def __repr__(self):
if self.base and self.extras:
return 'base extras'
if self.base:
return 'base'
if self.extras:
return 'extras'
def __eq__(self, diff):
if self.kernel == diff.kernel:
return (''.join((str(self.base), str(self.extras), self.version))
== ''.join((str(diff.base), str(diff.extras), diff.version)))
else:
return False
def __ne__(self, diff):
return not self.__eq__(diff)
class Kernel:
'Kernel class'
arch = str()
revision = str()
source = str()
version = str()
genpatch = None
def __init__(self, source):
self.source = source
def __repr__(self):
return str(self.version + '-' + self.source + '-' + self.revision)
def __eq__(self, diff):
return (''.join((self.revision, self.source,
self.version, str(self.genpatch)))
== ''.join((diff.revision, diff.source,
diff.version, str(diff.genpatch))))
def __ne__(self, diff):
return not self.__eq__(diff)
class Vulnerability:
'Vulnerability class'
arch = str()
bugid = int()
cvelist = list()
cves = list()
affected = list()
reported = str()
reporter = str()
status = str()
fixed = None
def __init__(self, bugid):
self.bugid = bugid
def __eq__(self, diff):
return (self.bugid == diff.bugid) #FIXME is this enough?
def __ne__(self, diff):
return not self.__eq__(diff)
class Interval:
"""Interval class
Provides one interval entry for a vulnerability
Attributes:
name: a string representing the name of the kernel release
lower: a string representing the lower boundary of the interval
upper: a string representing the upper boundary of the interval
lower_i: a boolean indicating if the lower boundary is inclusive
upper_i: a boolean indicating if the upper boundary is inclusive
"""
name = str()
lower = str()
upper = str()
lower_i = bool()
upper_i = bool()
def __init__(self, name, lower, upper, lower_i, upper_i):
if name == 'linux' or name == 'genpatches':
pass
elif name == 'gp':
name = 'genpatches'
name = name.replace('-sources', '')
self.name = name
self.lower_i = lower_i
self.upper_i = upper_i
if name == 'genpatches':
if lower:
self.lower = lower.replace('-','.')
else:
self.lower = lower
if upper:
self.upper = upper.replace('-','.')
else:
self.upper = upper
else:
self.lower = lower
self.upper = upper
def __repr__(self):
interval = str(self.name)
interval += ' '
if self.lower and self.lower_i:
interval += '>=%s ' % self.lower
if self.lower and not self.lower_i:
interval += '>%s ' % self.lower
if self.upper and self.upper_i:
interval += '<=%s' % self.upper
if self.upper and not self.upper_i:
interval += '<%s' % self.upper
return interval
def interval_from_xml(root):
'Returns an interval from xml'
name = root.get('source')
lower = ''
upper = ''
lower_i = False
upper_i = False
if root.find('lower') is not None:
lower = root.find('lower').text
lower_i = (root.find('lower').get('inclusive') == 'true')
if root.find('upper') is not None:
upper = root.find('upper').text
upper_i = (root.find('upper').get('inclusive') == 'true')
return Interval(name, lower, upper, lower_i, upper_i)
#TODO Add more kernel
def is_in_interval(interval, kernel, bugid=None):
'Returns True if the given version is inside our specified interval'
version = str()
if interval.name == 'linux':
version = kernel.version
elif interval.name == 'genpatches':
version = kernel.version.replace('-', '.')
elif interval.name == 'hardened':
version = kernel.version #TODO implement
elif interval.name == 'xen':
version = kernel.version #TODO implement
elif interval.name == 'vserver':
return False
else:
BUG_ON(interval.name, bugid.bugid)
return False
for item in ['lower', 'upper']:
if getattr(interval, item):
result = portage.versions.vercmp(version, getattr(interval, item))
if result == None:
BUG_ON('Could not compare %s and %s' %
(getattr(interval, item),version), bugid)
if result == 0 and not getattr(interval, item + '_i'):
return False
if result == 0 and getattr(interval, item + '_i'):
return True
if item == 'lower' and result < 0:
return False
if item == 'upper' and result > 0:
return False
return True
def get_genpatch(directory, kernel):
'Returns a list containing all genpatches from portage'
patches = list()
directory = os.path.join(directory, 'sys-kernel')
for sources in os.listdir(directory):
if '-sources' in sources:
for ebuild in os.listdir(os.path.join(directory, sources)):
if '.ebuild' in ebuild:
genpatch = extract_genpatch(ebuild, directory, sources)
if genpatch is not None:
if genpatch.kernel == kernel:
return genpatch
return None
def extract_genpatch(ebuild, directory, sources):
'Returns a genpatch from an ebuild'
pkg = portage.versions.catpkgsplit('sys-kernel/%s' % ebuild[:-7])
with open(os.path.join(directory, sources, ebuild), 'r') as ebuild_file:
content = ebuild_file.read()
try:
genpatch_v = REGEX['gp_version'].findall(content)[0]
genpatch_w = REGEX['gp_want'].findall(content)[0]
except: #FIXME
return None
kernel = Kernel(pkg[1].replace('-sources', ''))
kernel.version = pkg[2]
kernel.revision = pkg[3]
genpatch = Genpatch(pkg[2] + '-' + genpatch_v)
genpatch.kernel = kernel
genpatch.base = ('base' in genpatch_w)
genpatch.extras = ('extras' in genpatch_w)
return genpatch
def parse_cve_files(directory):
'Returns all bug files as list'
files = list()
if (os.path.exists(directory)):
for item in os.listdir(directory):
try:
cve_file = read_cve_file(directory, item)
if cve_file is not None:
files.append(cve_file)
except AttributeError, e:
BUG_ON(item, e)
return files
def find_cve(cve, directory):
'Returns a bug containing the cve'
for item in parse_cve_files(directory):
for cves in item.cves:
if cve == cves.cve:
return item
return None
def eval_cve_files(directory, kernel, spinner=None):
'Returns a vulnerabilty evaluation'
files = parse_cve_files(directory)
if not files:
return None
cve_amount = int()
cvss_score = int()
evaluation = Evaluation()
for item in files:
if spinner:
spinner.update()
evaluation.read += 1
if item.arch not in ARCHES:
BUG_ON('[Error] Wrong architecture %s' % item.arch, item.bugid)
if item.arch != kernel.arch and item.arch != 'all':
evaluation.unaffected.append(item)
else:
evaluation.arch += 1
if is_affected(item.affected, kernel, item):
evaluation.affected.append(item)
for cve in item.cves:
if cve.severity == 'Low':
evaluation.low += 1
if cve.severity == 'Medium':
evaluation.medium += 1
if cve.severity == 'High':
evaluation.high += 1
cve_amount += 1
cvss_score += float(cve.score)
else:
evaluation.unaffected.append(item)
if cve_amount is 0:
evaluation.avg_cvss = 0
else:
evaluation.avg_cvss = cvss_score / cve_amount
return evaluation
#TODO Remove item
def is_affected(interval_list, kernel, item):
'Returns true if a kernel is affected'
kernel_gentoo = (kernel.source == 'gentoo' and kernel.genpatch is not None)
kernel_affected = False
kernel_linux_affected = False
kernel_gp_affected = False
linux_interval = False
gentoo_interval = False
for interval in interval_list:
if interval.name == 'genpatches':
gentoo_interval = True
if kernel_gentoo:
if is_in_interval(interval, kernel.genpatch, item):
kernel_gp_affected = True
elif interval.name == 'linux':
linux_interval = True
if is_in_interval(interval, kernel, item):
kernel_linux_affected = True
else:
pass #TODO
if linux_interval:
if kernel_linux_affected:
if gentoo_interval and kernel_gentoo:
if kernel_gp_affected:
kernel_affected = True
else:
kernel_affected = False
else:
kernel_affected = True
else:
kernel_affected = False
else:
if kernel_gentoo and gentoo_interval:
if kernel_gp_affected:
kernel_affected = True
else:
kernel_affected = False
#TODO Implement else for hardend and xen
return kernel_affected
def compare_evaluation(kernel, compare):
'Creates a comparison out of two evaluation instances'
comparison = Comparison()
if kernel.read != compare.read:
BUG_ON('Kernels do not match (read) : %s' % kernel.read, compare.read)
return
if kernel.arch != compare.arch:
BUG_ON('Kernels do not match (arch) : %s' % kernel.arch, compare.arch)
return
for item in kernel.affected:
if item not in compare.affected:
comparison.fixed.append(item)
for item in compare.affected:
if item not in kernel.affected:
comparison.new.append(item)
return comparison
def read_cve_file(directory, bugid):
'Read a bug file created by collector'
cves = list()
affected = list()
filename = os.path.join(directory, '%s.xml' % bugid[:-4])
try:
with open(filename, 'r+') as xml_data:
memory_map = mmap.mmap(xml_data.fileno(), 0)
root = xml.etree.cElementTree.parse(memory_map).getroot()
except IOError, e:
BUG_ON(bugid, e)
return None
bugroot = root.find('bug')
vul = Vulnerability(bugroot.find('bugid').text)
for elem in ['arch', 'reported', 'reporter', 'status']:
setattr(vul, elem, bugroot.find(elem).text)
affectedroot = bugroot.find('affected')
for item in affectedroot:
interval = interval_from_xml(item)
affected.append(interval)
vul.affected = affected
for item in root:
if item.tag == 'cve':
cve = Cve(item.find('cve').text)
if cve is None:
return None
for elem in ['desc', 'published', 'refs',
'severity', 'score', 'vector']:
element = item.find(elem)
if element is not None:
setattr(cve, elem, element.text)
else:
BUG_ON(filename, '(%s, \'No such element\')' % elem)
cves.append(cve)
vul.cves = cves
return vul
#TODO Use Exceptions
def extract_version(release):
'Extracts revision, source and version out of a release tag'
match = REGEX['k_version'].match(release)
if not match:
BUG_ON('Contains no valid information', release)
return None
version, rest = match.groups()
kernel = Kernel('vanilla')
kernel.revision = 'r0'
kernel.version = version
for elem in (rest or '').split('-'):
if elem == 'sources':
pass
elif REGEX['rc_kernel'].match(elem):
kernel.version += '_' + elem
elif REGEX['git_kernel'].match(elem):
kernel.source = 'git'
kernel.revision = 'r' + REGEX['gitd'].match(elem).groups()[0]
elif REGEX['r_kernel'].match(elem):
kernel.revision = elem
elif elem in KERNEL_TYPES:
kernel.source = elem
elif elem != '':
BUG_ON('Dropping unknown version component', elem)
return kernel
def all_version(source):
""" Given a kernel source name (e.g. vanilla), returns a Kernel object
for the latest revision in the tree, or None if none exists. """
versions = list()
porttree = portage.db[portage.root]['porttree']
matches = porttree.dbapi.xmatch('match-all',
'sys-kernel/%s-sources' % source)
for item in matches:
best = portage.versions.catpkgsplit(item)
if not best:
continue
kernel = Kernel(best[1].replace('-sources', ''))
kernel.version = best[2]
kernel.revision = best[3]
versions.append(kernel)
return versions
def eval_kernel_updates(kernel, kernel_eval, spinner):
""
index = 0
kernel_dict = dict()
for compare in all_version(kernel.source):
if compare.version > kernel.version or \
(compare.version == kernel.version and \
compare.revision > kernel.revision):
compare.arch = kernel.arch
compare.genpatch = get_genpatch(PORTDIR, compare)
compare_eval = eval_cve_files(DIR['out'], compare, spinner)
comparison = compare_evaluation(kernel_eval, compare_eval)
for item in comparison.fixed:
if item.fixed is None:
item.fixed = compare
if repr(compare) not in kernel_dict:
kernel_dict[repr(compare)] = index
index += 1
return kernel_dict
def gather_configuration():
""
config = dict()
mmap_min_addr = str()
modules = str()
try:
mmap_min_addr = open('/proc/sys/vm/mmap_min_addr').read().strip()
except: #FIXME
mmap_min_addr = '?'
config['Mmap_min_addr'] = mmap_min_addr
try:
for line in open('/proc/modules').readlines():
modules += '%s ' % line.split(' ')[0]
except: #FIXME
modules = '?'
config['Loaded modules'] = modules
return config
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