/usr/lib/python3/dist-packages/apparmor/easyprof.py is in python3-apparmor 2.9.0-3.
This file is owned by root:root, with mode 0o644.
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#
# Copyright (C) 2011-2013 Canonical Ltd.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
from __future__ import with_statement
import codecs
import copy
import glob
import json
import optparse
import os
import re
import shutil
import subprocess
import sys
import tempfile
#
# TODO: move this out to the common library
#
#from apparmor import AppArmorException
class AppArmorException(Exception):
'''This class represents AppArmor exceptions'''
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
#
# End common
#
DEBUGGING = False
#
# TODO: move this out to a utilities library
#
def error(out, exit_code=1, do_exit=True):
'''Print error message and exit'''
try:
sys.stderr.write("ERROR: %s\n" % (out))
except IOError:
pass
if do_exit:
sys.exit(exit_code)
def warn(out):
'''Print warning message'''
try:
sys.stderr.write("WARN: %s\n" % (out))
except IOError:
pass
def msg(out, output=sys.stdout):
'''Print message'''
try:
sys.stdout.write("%s\n" % (out))
except IOError:
pass
def cmd(command):
'''Try to execute the given command.'''
debug(command)
try:
sp = subprocess.Popen(command, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
except OSError as ex:
return [127, str(ex)]
out = sp.communicate()[0]
return [sp.returncode, out]
def cmd_pipe(command1, command2):
'''Try to pipe command1 into command2.'''
try:
sp1 = subprocess.Popen(command1, stdout=subprocess.PIPE)
sp2 = subprocess.Popen(command2, stdin=sp1.stdout)
except OSError as ex:
return [127, str(ex)]
out = sp2.communicate()[0]
return [sp2.returncode, out]
def debug(out):
'''Print debug message'''
if DEBUGGING:
try:
sys.stderr.write("DEBUG: %s\n" % (out))
except IOError:
pass
def valid_binary_path(path):
'''Validate name'''
try:
a_path = os.path.abspath(path)
except Exception:
debug("Could not find absolute path for binary")
return False
if path != a_path:
debug("Binary should use a normalized absolute path")
return False
if not os.path.exists(a_path):
return True
r_path = os.path.realpath(path)
if r_path != a_path:
debug("Binary should not be a symlink")
return False
return True
def valid_variable(v):
'''Validate variable name'''
debug("Checking '%s'" % v)
try:
(key, value) = v.split('=')
except Exception:
return False
if not re.search(r'^@\{[a-zA-Z0-9_]+\}$', key):
return False
if '/' in value:
rel_ok = False
if not value.startswith('/'):
rel_ok = True
if not valid_path(value, relative_ok=rel_ok):
return False
if '"' in value:
return False
# If we made it here, we are safe
return True
def valid_path(path, relative_ok=False):
'''Valid path'''
m = "Invalid path: %s" % (path)
if not relative_ok and not path.startswith('/'):
debug("%s (relative)" % (m))
return False
if '"' in path: # We double quote elsewhere
debug("%s (quote)" % (m))
return False
if '../' in path:
debug("%s (../ path escape)" % (m))
return False
try:
p = os.path.normpath(path)
except Exception:
debug("%s (could not normalize)" % (m))
return False
if p != path:
debug("%s (normalized path != path (%s != %s))" % (m, p, path))
return False
# If we made it here, we are safe
return True
def _is_safe(s):
'''Known safe regex'''
if re.search(r'^[a-zA-Z_0-9\-\.]+$', s):
return True
return False
def valid_policy_vendor(s):
'''Verify the policy vendor'''
return _is_safe(s)
def valid_policy_version(v):
'''Verify the policy version'''
try:
float(v)
except ValueError:
return False
if float(v) < 0:
return False
return True
def valid_template_name(s, strict=False):
'''Verify the template name'''
if not strict and s.startswith('/'):
if not valid_path(s):
return False
return True
return _is_safe(s)
def valid_abstraction_name(s):
'''Verify the template name'''
return _is_safe(s)
def valid_profile_name(s):
'''Verify the profile name'''
# profile name specifies path
if s.startswith('/'):
if not valid_path(s):
return False
return True
# profile name does not specify path
# alpha-numeric and Debian version, plus '_'
if re.search(r'^[a-zA-Z0-9][a-zA-Z0-9_\+\-\.:~]+$', s):
return True
return False
def valid_policy_group_name(s):
'''Verify policy group name'''
return _is_safe(s)
def get_directory_contents(path):
'''Find contents of the given directory'''
if not valid_path(path):
return None
files = []
for f in glob.glob(path + "/*"):
files.append(f)
files.sort()
return files
def open_file_read(path):
'''Open specified file read-only'''
try:
orig = codecs.open(path, 'r', "UTF-8")
except Exception:
raise
return orig
def verify_policy(policy):
'''Verify policy compiles'''
exe = "/sbin/apparmor_parser"
if not os.path.exists(exe):
rc, exe = cmd(['which', 'apparmor_parser'])
if rc != 0:
warn("Could not find apparmor_parser. Skipping verify")
return True
fn = ""
# if policy starts with '/' and is one line, assume it is a path
if len(policy.splitlines()) == 1 and valid_path(policy):
fn = policy
else:
f, fn = tempfile.mkstemp(prefix='aa-easyprof')
if not isinstance(policy, bytes):
policy = policy.encode('utf-8')
os.write(f, policy)
os.close(f)
rc, out = cmd([exe, '-QTK', fn])
os.unlink(fn)
if rc == 0:
return True
return False
#
# End utility functions
#
class AppArmorEasyProfile:
'''Easy profile class'''
def __init__(self, binary, opt):
verify_options(opt)
opt.ensure_value("conffile", "/etc/apparmor/easyprof.conf")
self.conffile = os.path.abspath(opt.conffile)
debug("Examining confile=%s" % (self.conffile))
self.dirs = dict()
if os.path.isfile(self.conffile):
self._get_defaults()
if opt.templates_dir and os.path.isdir(opt.templates_dir):
self.dirs['templates'] = os.path.abspath(opt.templates_dir)
elif not opt.templates_dir and \
opt.template and \
os.path.isfile(opt.template) and \
valid_path(opt.template):
# If we specified the template and it is an absolute path, just set
# the templates directory to the parent of the template so we don't
# have to require --template-dir with absolute paths.
self.dirs['templates'] = os.path.abspath(os.path.dirname(opt.template))
if opt.policy_groups_dir and os.path.isdir(opt.policy_groups_dir):
self.dirs['policygroups'] = os.path.abspath(opt.policy_groups_dir)
self.policy_version = None
self.policy_vendor = None
if (opt.policy_version and not opt.policy_vendor) or \
(opt.policy_vendor and not opt.policy_version):
raise AppArmorException("Must specify both policy version and vendor")
if opt.policy_version and opt.policy_vendor:
self.policy_vendor = opt.policy_vendor
self.policy_version = str(opt.policy_version)
for i in ['templates', 'policygroups']:
d = os.path.join(self.dirs[i], \
self.policy_vendor, \
self.policy_version)
if not os.path.isdir(d):
raise AppArmorException(
"Could not find %s directory '%s'" % (i, d))
self.dirs[i] = d
if not 'templates' in self.dirs:
raise AppArmorException("Could not find templates directory")
if not 'policygroups' in self.dirs:
raise AppArmorException("Could not find policygroups directory")
self.aa_topdir = "/etc/apparmor.d"
self.binary = binary
if binary:
if not valid_binary_path(binary):
raise AppArmorException("Invalid path for binary: '%s'" % binary)
if opt.manifest:
self.set_template(opt.template, allow_abs_path=False)
else:
self.set_template(opt.template)
self.set_policygroup(opt.policy_groups)
if opt.name:
self.set_name(opt.name)
elif self.binary != None:
self.set_name(self.binary)
self.templates = []
for f in get_directory_contents(self.dirs['templates']):
if os.path.isfile(f):
self.templates.append(f)
self.policy_groups = []
for f in get_directory_contents(self.dirs['policygroups']):
if os.path.isfile(f):
self.policy_groups.append(f)
def _get_defaults(self):
'''Read in defaults from configuration'''
if not os.path.exists(self.conffile):
raise AppArmorException("Could not find '%s'" % self.conffile)
# Read in the configuration
f = open_file_read(self.conffile)
pat = re.compile(r'^\w+=".*"?')
for line in f:
if not pat.search(line):
continue
if line.startswith("POLICYGROUPS_DIR="):
d = re.split(r'=', line.strip())[1].strip('["\']')
self.dirs['policygroups'] = d
elif line.startswith("TEMPLATES_DIR="):
d = re.split(r'=', line.strip())[1].strip('["\']')
self.dirs['templates'] = d
f.close()
keys = self.dirs.keys()
if 'templates' not in keys:
raise AppArmorException("Could not find TEMPLATES_DIR in '%s'" % self.conffile)
if 'policygroups' not in keys:
raise AppArmorException("Could not find POLICYGROUPS_DIR in '%s'" % self.conffile)
for k in self.dirs.keys():
if not os.path.isdir(self.dirs[k]):
raise AppArmorException("Could not find '%s'" % self.dirs[k])
def set_name(self, name):
'''Set name of policy'''
self.name = name
def get_template(self):
'''Get contents of current template'''
return open(self.template).read()
def set_template(self, template, allow_abs_path=True):
'''Set current template'''
if "../" in template:
raise AppArmorException('template "%s" contains "../" escape path' % (template))
elif template.startswith('/') and not allow_abs_path:
raise AppArmorException("Cannot use an absolute path template '%s'" % template)
if template.startswith('/'):
self.template = template
else:
self.template = os.path.join(self.dirs['templates'], template)
if not os.path.exists(self.template):
raise AppArmorException('%s does not exist' % (self.template))
def get_templates(self):
'''Get list of all available templates by filename'''
return self.templates
def get_policygroup(self, policygroup):
'''Get contents of specific policygroup'''
p = policygroup
if not p.startswith('/'):
p = os.path.join(self.dirs['policygroups'], p)
if self.policy_groups == None or not p in self.policy_groups:
raise AppArmorException("Policy group '%s' does not exist" % p)
return open(p).read()
def set_policygroup(self, policygroups):
'''Set policygroups'''
self.policy_groups = []
if policygroups != None:
for p in policygroups.split(','):
if not p.startswith('/'):
p = os.path.join(self.dirs['policygroups'], p)
if not os.path.exists(p):
raise AppArmorException('%s does not exist' % (p))
self.policy_groups.append(p)
def get_policy_groups(self):
'''Get list of all policy groups by filename'''
return self.policy_groups
def gen_abstraction_rule(self, abstraction):
'''Generate an abstraction rule'''
p = os.path.join(self.aa_topdir, "abstractions", abstraction)
if not os.path.exists(p):
raise AppArmorException("%s does not exist" % p)
return "#include <abstractions/%s>" % abstraction
def gen_variable_declaration(self, dec):
'''Generate a variable declaration'''
if not valid_variable(dec):
raise AppArmorException("Invalid variable declaration '%s'" % dec)
# Make sure we always quote
k, v = dec.split('=')
return '%s="%s"' % (k, v)
def gen_path_rule(self, path, access):
rule = []
if not path.startswith('/') and not path.startswith('@'):
raise AppArmorException("'%s' should not be relative path" % path)
owner = ""
if path.startswith('/home/') or path.startswith("@{HOME"):
owner = "owner "
if path.endswith('/'):
rule.append("%s %s," % (path, access))
rule.append("%s%s** %s," % (owner, path, access))
elif path.endswith('/**') or path.endswith('/*'):
rule.append("%s %s," % (os.path.dirname(path), access))
rule.append("%s%s %s," % (owner, path, access))
else:
rule.append("%s%s %s," % (owner, path, access))
return rule
def gen_policy(self, name,
binary=None,
profile_name=None,
template_var=[],
abstractions=None,
policy_groups=None,
read_path=[],
write_path=[],
author=None,
comment=None,
copyright=None,
no_verify=False):
def find_prefix(t, s):
'''Calculate whitespace prefix based on occurrence of s in t'''
pat = re.compile(r'^ *%s' % s)
p = ""
for line in t.splitlines():
if pat.match(line):
p = " " * (len(line) - len(line.lstrip()))
break
return p
policy = self.get_template()
if '###ENDUSAGE###' in policy:
found = False
tmp = ""
for line in policy.splitlines():
if not found:
if line.startswith('###ENDUSAGE###'):
found = True
continue
tmp += line + "\n"
policy = tmp
attachment = ""
if binary:
if not valid_binary_path(binary):
raise AppArmorException("Invalid path for binary: '%s'" % \
binary)
if profile_name:
attachment = 'profile "%s" "%s"' % (profile_name, binary)
else:
attachment = '"%s"' % binary
elif profile_name:
attachment = 'profile "%s"' % profile_name
else:
raise AppArmorException("Must specify binary and/or profile name")
policy = re.sub(r'###PROFILEATTACH###', attachment, policy)
policy = re.sub(r'###NAME###', name, policy)
# Fill-in various comment fields
if comment != None:
policy = re.sub(r'###COMMENT###', "Comment: %s" % comment, policy)
if author != None:
policy = re.sub(r'###AUTHOR###', "Author: %s" % author, policy)
if copyright != None:
policy = re.sub(r'###COPYRIGHT###', "Copyright: %s" % copyright, policy)
# Fill-in rules and variables with proper indenting
search = '###ABSTRACTIONS###'
prefix = find_prefix(policy, search)
s = "%s# No abstractions specified" % prefix
if abstractions != None:
s = "%s# Specified abstractions" % (prefix)
t = abstractions.split(',')
t.sort()
for i in t:
s += "\n%s%s" % (prefix, self.gen_abstraction_rule(i))
policy = re.sub(r' *%s' % search, s, policy)
search = '###POLICYGROUPS###'
prefix = find_prefix(policy, search)
s = "%s# No policy groups specified" % prefix
if policy_groups != None:
s = "%s# Rules specified via policy groups" % (prefix)
t = policy_groups.split(',')
t.sort()
for i in t:
for line in self.get_policygroup(i).splitlines():
s += "\n%s%s" % (prefix, line)
if i != policy_groups.split(',')[-1]:
s += "\n"
policy = re.sub(r' *%s' % search, s, policy)
search = '###VAR###'
prefix = find_prefix(policy, search)
s = "%s# No template variables specified" % prefix
if len(template_var) > 0:
s = "%s# Specified profile variables" % (prefix)
template_var.sort()
for i in template_var:
s += "\n%s%s" % (prefix, self.gen_variable_declaration(i))
policy = re.sub(r' *%s' % search, s, policy)
search = '###READS###'
prefix = find_prefix(policy, search)
s = "%s# No read paths specified" % prefix
if len(read_path) > 0:
s = "%s# Specified read permissions" % (prefix)
read_path.sort()
for i in read_path:
for r in self.gen_path_rule(i, 'rk'):
s += "\n%s%s" % (prefix, r)
policy = re.sub(r' *%s' % search, s, policy)
search = '###WRITES###'
prefix = find_prefix(policy, search)
s = "%s# No write paths specified" % prefix
if len(write_path) > 0:
s = "%s# Specified write permissions" % (prefix)
write_path.sort()
for i in write_path:
for r in self.gen_path_rule(i, 'rwk'):
s += "\n%s%s" % (prefix, r)
policy = re.sub(r' *%s' % search, s, policy)
if no_verify:
debug("Skipping policy verification")
elif not verify_policy(policy):
msg("\n" + policy)
raise AppArmorException("Invalid policy")
return policy
def output_policy(self, params, count=0, dir=None):
'''Output policy'''
policy = self.gen_policy(**params)
if not dir:
if count:
sys.stdout.write('### aa-easyprof profile #%d ###\n' % count)
sys.stdout.write('%s\n' % policy)
else:
out_fn = ""
if 'profile_name' in params:
out_fn = params['profile_name']
elif 'binary' in params:
out_fn = params['binary']
else: # should not ever reach this
raise AppArmorException("Could not determine output filename")
# Generate an absolute path, convertng any path delimiters to '.'
out_fn = os.path.join(dir, re.sub(r'/', '.', out_fn.lstrip('/')))
if os.path.exists(out_fn):
raise AppArmorException("'%s' already exists" % out_fn)
if not os.path.exists(dir):
os.mkdir(dir)
if not os.path.isdir(dir):
raise AppArmorException("'%s' is not a directory" % dir)
f, fn = tempfile.mkstemp(prefix='aa-easyprof')
if not isinstance(policy, bytes):
policy = policy.encode('utf-8')
os.write(f, policy)
os.close(f)
shutil.move(fn, out_fn)
def gen_manifest(self, params):
'''Take params list and output a JSON file'''
d = dict()
d['security'] = dict()
d['security']['profiles'] = dict()
pkey = ""
if 'profile_name' in params:
pkey = params['profile_name']
elif 'binary' in params:
# when profile_name is not specified, the binary (path attachment)
# also functions as the profile name
pkey = params['binary']
else:
raise AppArmorException("Must supply binary or profile name")
d['security']['profiles'][pkey] = dict()
# Add the template since it isn't part of 'params'
template = os.path.basename(self.template)
if template != 'default':
d['security']['profiles'][pkey]['template'] = template
# Add the policy_version since it isn't part of 'params'
if self.policy_version:
d['security']['profiles'][pkey]['policy_version'] = float(self.policy_version)
if self.policy_vendor:
d['security']['profiles'][pkey]['policy_vendor'] = self.policy_vendor
for key in params:
if key == 'profile_name' or \
(key == 'binary' and not 'profile_name' in params):
continue # don't re-add the pkey
elif key == 'binary' and not params[key]:
continue # binary can by None when specifying --profile-name
elif key == 'template_var':
d['security']['profiles'][pkey]['template_variables'] = dict()
for tvar in params[key]:
if not self.gen_variable_declaration(tvar):
raise AppArmorException("Malformed template_var '%s'" % tvar)
(k, v) = tvar.split('=')
k = k.lstrip('@').lstrip('{').rstrip('}')
d['security']['profiles'][pkey]['template_variables'][k] = v
elif key == 'abstractions' or key == 'policy_groups':
d['security']['profiles'][pkey][key] = params[key].split(",")
d['security']['profiles'][pkey][key].sort()
else:
d['security']['profiles'][pkey][key] = params[key]
json_str = json.dumps(d,
sort_keys=True,
indent=2,
separators=(',', ': ')
)
return json_str
def print_basefilenames(files):
for i in files:
sys.stdout.write("%s\n" % (os.path.basename(i)))
def print_files(files):
for i in files:
with open(i) as f:
sys.stdout.write(f.read()+"\n")
def check_manifest_conflict_args(option, opt_str, value, parser):
'''Check for -m/--manifest with conflicting args'''
conflict_args = ['abstractions',
'read_path',
'write_path',
# template always get set to 'default', can't conflict
# 'template',
'policy_groups',
'policy_version',
'policy_vendor',
'name',
'profile_name',
'comment',
'copyright',
'author',
'template_var']
for conflict in conflict_args:
if getattr(parser.values, conflict, False):
raise optparse.OptionValueError("can't use --%s with --manifest " \
"argument" % conflict)
setattr(parser.values, option.dest, value)
def check_for_manifest_arg(option, opt_str, value, parser):
'''Check for -m/--manifest with conflicting args'''
if parser.values.manifest:
raise optparse.OptionValueError("can't use --%s with --manifest " \
"argument" % opt_str.lstrip('-'))
setattr(parser.values, option.dest, value)
def check_for_manifest_arg_append(option, opt_str, value, parser):
'''Check for -m/--manifest with conflicting args (with append)'''
if parser.values.manifest:
raise optparse.OptionValueError("can't use --%s with --manifest " \
"argument" % opt_str.lstrip('-'))
parser.values.ensure_value(option.dest, []).append(value)
def add_parser_policy_args(parser):
'''Add parser arguments'''
parser.add_option("-a", "--abstractions",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="abstractions",
help="Comma-separated list of abstractions",
metavar="ABSTRACTIONS")
parser.add_option("--read-path",
action="callback",
callback=check_for_manifest_arg_append,
type=str,
dest="read_path",
help="Path allowing owner reads",
metavar="PATH")
parser.add_option("--write-path",
action="callback",
callback=check_for_manifest_arg_append,
type=str,
dest="write_path",
help="Path allowing owner writes",
metavar="PATH")
parser.add_option("-t", "--template",
dest="template",
help="Use non-default policy template",
metavar="TEMPLATE",
default='default')
parser.add_option("--templates-dir",
dest="templates_dir",
help="Use non-default templates directory",
metavar="DIR")
parser.add_option("-p", "--policy-groups",
action="callback",
callback=check_for_manifest_arg,
type=str,
help="Comma-separated list of policy groups",
metavar="POLICYGROUPS")
parser.add_option("--policy-groups-dir",
dest="policy_groups_dir",
help="Use non-default policy-groups directory",
metavar="DIR")
parser.add_option("--policy-version",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="policy_version",
help="Specify version for templates and policy groups",
metavar="VERSION")
parser.add_option("--policy-vendor",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="policy_vendor",
help="Specify vendor for templates and policy groups",
metavar="VENDOR")
parser.add_option("--profile-name",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="profile_name",
help="AppArmor profile name",
metavar="PROFILENAME")
def parse_args(args=None, parser=None):
'''Parse arguments'''
global DEBUGGING
if parser == None:
parser = optparse.OptionParser()
parser.add_option("-c", "--config-file",
dest="conffile",
help="Use alternate configuration file",
metavar="FILE")
parser.add_option("-d", "--debug",
help="Show debugging output",
action='store_true',
default=False)
parser.add_option("--no-verify",
help="Don't verify policy using 'apparmor_parser -p'",
action='store_true',
default=False)
parser.add_option("--list-templates",
help="List available templates",
action='store_true',
default=False)
parser.add_option("--show-template",
help="Show specified template",
action='store_true',
default=False)
parser.add_option("--list-policy-groups",
help="List available policy groups",
action='store_true',
default=False)
parser.add_option("--show-policy-group",
help="Show specified policy groups",
action='store_true',
default=False)
parser.add_option("-n", "--name",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="name",
help="Name of policy (not AppArmor profile name)",
metavar="COMMENT")
parser.add_option("--comment",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="comment",
help="Comment for policy",
metavar="COMMENT")
parser.add_option("--author",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="author",
help="Author of policy",
metavar="COMMENT")
parser.add_option("--copyright",
action="callback",
callback=check_for_manifest_arg,
type=str,
dest="copyright",
help="Copyright for policy",
metavar="COMMENT")
parser.add_option("--template-var",
action="callback",
callback=check_for_manifest_arg_append,
type=str,
dest="template_var",
help="Declare AppArmor variable",
metavar="@{VARIABLE}=VALUE")
parser.add_option("--output-format",
action="store",
dest="output_format",
help="Specify output format as text (default) or json",
metavar="FORMAT",
default="text")
parser.add_option("--output-directory",
action="store",
dest="output_directory",
help="Output policy to this directory",
metavar="DIR")
# This option conflicts with any of the value arguments, e.g. name,
# author, template-var, etc.
parser.add_option("-m", "--manifest",
action="callback",
callback=check_manifest_conflict_args,
type=str,
dest="manifest",
help="JSON manifest file",
metavar="FILE")
parser.add_option("--verify-manifest",
action="store_true",
default=False,
dest="verify_manifest",
help="Verify JSON manifest file")
# add policy args now
add_parser_policy_args(parser)
(my_opt, my_args) = parser.parse_args(args)
if my_opt.debug:
DEBUGGING = True
return (my_opt, my_args)
def gen_policy_params(binary, opt):
'''Generate parameters for gen_policy'''
params = dict(binary=binary)
if not binary and not opt.profile_name:
raise AppArmorException("Must specify binary and/or profile name")
if opt.profile_name:
params['profile_name'] = opt.profile_name
if opt.name:
params['name'] = opt.name
else:
if opt.profile_name:
params['name'] = opt.profile_name
elif binary:
params['name'] = os.path.basename(binary)
if opt.template_var: # What about specified multiple times?
params['template_var'] = opt.template_var
if opt.abstractions:
params['abstractions'] = opt.abstractions
if opt.policy_groups:
params['policy_groups'] = opt.policy_groups
if opt.read_path:
params['read_path'] = opt.read_path
if opt.write_path:
params['write_path'] = opt.write_path
if opt.comment:
params['comment'] = opt.comment
if opt.author:
params['author'] = opt.author
if opt.copyright:
params['copyright'] = opt.copyright
if opt.policy_version and opt.output_format == "json":
params['policy_version'] = opt.policy_version
if opt.policy_vendor and opt.output_format == "json":
params['policy_vendor'] = opt.policy_vendor
return params
def parse_manifest(manifest, opt_orig):
'''Take a JSON manifest as a string and updates options, returning an
updated binary. Note that a JSON file may contain multiple profiles.'''
try:
m = json.loads(manifest)
except ValueError:
raise AppArmorException("Could not parse manifest")
if 'security' in m:
top_table = m['security']
else:
top_table = m
if 'profiles' not in top_table:
raise AppArmorException("Could not parse manifest (could not find 'profiles')")
table = top_table['profiles']
# generally mirrors what is settable in gen_policy_params()
valid_keys = ['abstractions',
'author',
'binary',
'comment',
'copyright',
'name',
'policy_groups',
'policy_version',
'policy_vendor',
'profile_name',
'read_path',
'template',
'template_variables',
'write_path',
]
profiles = []
for profile_name in table:
if not isinstance(table[profile_name], dict):
raise AppArmorException("Wrong JSON structure")
opt = copy.deepcopy(opt_orig)
# The JSON structure is:
# {
# "security": {
# <profile_name>: {
# "binary": ...
# ...
# but because binary can be the profile name, we need to handle
# 'profile_name' and 'binary' special. If a profile_name starts with
# '/', then it is considered the binary. Otherwise, set the
# profile_name and set the binary if it is in the JSON.
binary = None
if profile_name.startswith('/'):
if 'binary' in table[profile_name]:
raise AppArmorException("Profile name should not specify path with binary")
binary = profile_name
else:
setattr(opt, 'profile_name', profile_name)
if 'binary' in table[profile_name]:
binary = table[profile_name]['binary']
setattr(opt, 'binary', binary)
for key in table[profile_name]:
if key not in valid_keys:
raise AppArmorException("Invalid key '%s'" % key)
if key == 'binary':
continue # handled above
elif key == 'abstractions' or key == 'policy_groups':
setattr(opt, key, ",".join(table[profile_name][key]))
elif key == "template_variables":
t = table[profile_name]['template_variables']
vlist = []
for v in t.keys():
vlist.append("@{%s}=%s" % (v, t[v]))
setattr(opt, 'template_var', vlist)
else:
if hasattr(opt, key):
setattr(opt, key, table[profile_name][key])
profiles.append( (binary, opt) )
return profiles
def verify_options(opt, strict=False):
'''Make sure our options are valid'''
if hasattr(opt, 'binary') and opt.binary and not valid_path(opt.binary):
raise AppArmorException("Invalid binary '%s'" % opt.binary)
if hasattr(opt, 'profile_name') and opt.profile_name != None and \
not valid_profile_name(opt.profile_name):
raise AppArmorException("Invalid profile name '%s'" % opt.profile_name)
if hasattr(opt, 'binary') and opt.binary and \
hasattr(opt, 'profile_name') and opt.profile_name != None and \
opt.profile_name.startswith('/'):
raise AppArmorException("Profile name should not specify path with binary")
if hasattr(opt, 'policy_vendor') and opt.policy_vendor and \
not valid_policy_vendor(opt.policy_vendor):
raise AppArmorException("Invalid policy vendor '%s'" % \
opt.policy_vendor)
if hasattr(opt, 'policy_version') and opt.policy_version and \
not valid_policy_version(opt.policy_version):
raise AppArmorException("Invalid policy version '%s'" % \
opt.policy_version)
if hasattr(opt, 'template') and opt.template and \
not valid_template_name(opt.template, strict):
raise AppArmorException("Invalid template '%s'" % opt.template)
if hasattr(opt, 'template_var') and opt.template_var:
for i in opt.template_var:
if not valid_variable(i):
raise AppArmorException("Invalid variable '%s'" % i)
if hasattr(opt, 'policy_groups') and opt.policy_groups:
for i in opt.policy_groups.split(','):
if not valid_policy_group_name(i):
raise AppArmorException("Invalid policy group '%s'" % i)
if hasattr(opt, 'abstractions') and opt.abstractions:
for i in opt.abstractions.split(','):
if not valid_abstraction_name(i):
raise AppArmorException("Invalid abstraction '%s'" % i)
if hasattr(opt, 'read_paths') and opt.read_paths:
for i in opt.read_paths:
if not valid_path(i):
raise AppArmorException("Invalid read path '%s'" % i)
if hasattr(opt, 'write_paths') and opt.write_paths:
for i in opt.write_paths:
if not valid_path(i):
raise AppArmorException("Invalid write path '%s'" % i)
def verify_manifest(params, args=None):
'''Verify manifest for safe and unsafe options'''
err_str = ""
(opt, args) = parse_args(args)
fake_easyp = AppArmorEasyProfile(None, opt)
unsafe_keys = ['read_path', 'write_path']
safe_abstractions = ['base']
for k in params:
debug("Examining %s=%s" % (k, params[k]))
if k in unsafe_keys:
err_str += "\nfound %s key" % k
elif k == 'profile_name':
if params['profile_name'].startswith('/') or \
'*' in params['profile_name']:
err_str += "\nprofile_name '%s'" % params['profile_name']
elif k == 'abstractions':
for a in params['abstractions'].split(','):
if not a in safe_abstractions:
err_str += "\nfound '%s' abstraction" % a
elif k == "template_var":
pat = re.compile(r'[*/\{\}\[\]]')
for tv in params['template_var']:
if not fake_easyp.gen_variable_declaration(tv):
err_str += "\n%s" % tv
continue
tv_val = tv.split('=')[1]
debug("Examining %s" % tv_val)
if '..' in tv_val or pat.search(tv_val):
err_str += "\n%s" % tv
if err_str:
warn("Manifest definition is potentially unsafe%s" % err_str)
return False
return True
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