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Current File : /usr/sbin/apparmor_status
#! /usr/bin/python3
# ------------------------------------------------------------------
#
#    Copyright (C) 2005-2006 Novell/SUSE
#    Copyright (C) 2011 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.
#
# ------------------------------------------------------------------

import re, os, sys, errno, json

# PLEASE NOTE: we try to keep aa-status as minimal as possible, for
# environments where installing all of the python utils and python
# apparmor module may not make sense. Please think carefully before
# importing anything from apparmor; see how the apparmor.fail import is
# handled below.

# setup exception handling
try:
    from apparmor.fail import enable_aa_exception_handler
    enable_aa_exception_handler()
except ImportError:
    # just let normal python exceptions happen (LP: #1480492)
    pass

def cmd_enabled():
    '''Returns error code if AppArmor is not enabled'''
    if get_profiles() == {}:
        sys.exit(2)

def cmd_profiled():
    '''Prints the number of loaded profiles'''
    profiles = get_profiles()
    sys.stdout.write("%d\n" % len(profiles))
    if profiles == {}:
        sys.exit(2)

def cmd_enforced():
    '''Prints the number of loaded enforcing profiles'''
    profiles = get_profiles()
    sys.stdout.write("%d\n" % len(filter_profiles(profiles, 'enforce')))
    if profiles == {}:
        sys.exit(2)

def cmd_complaining():
    '''Prints the number of loaded non-enforcing profiles'''
    profiles = get_profiles()
    sys.stdout.write("%d\n" % len(filter_profiles(profiles, 'complain')))
    if profiles == {}:
        sys.exit(2)

def cmd_verbose():
    '''Displays multiple data points about loaded profile set'''
    global verbose
    verbose = True
    profiles = get_profiles()
    processes = get_processes(profiles)

    stdmsg("%d profiles are loaded." % len(profiles))
    for status in ('enforce', 'complain'):
        filtered_profiles = filter_profiles(profiles, status)
        stdmsg("%d profiles are in %s mode." % (len(filtered_profiles), status))
        for item in filtered_profiles:
                stdmsg("   %s" % item)

    stdmsg("%d processes have profiles defined." % len(processes))
    for status in ('enforce', 'complain', 'unconfined'):
        filtered_processes = filter_processes(processes, status)
        if status == 'unconfined':
            stdmsg("%d processes are unconfined but have a profile defined." % len(filtered_processes))
        else:
            stdmsg("%d processes are in %s mode." % (len(filtered_processes), status))
        # Sort by name, and then by pid
        filtered_processes.sort(key=lambda x: int(x[0]))
        filtered_processes.sort(key=lambda x: x[1])
        for (pid, profile, exe) in filtered_processes:
            if exe == profile:
                profile = ""
            stdmsg("   %s (%s) %s" % (exe, pid, profile))

    if profiles == {}:
        sys.exit(2)

def cmd_json(pretty_output=False):
    '''Outputs multiple data points about loaded profile set in a machine-readable JSON format'''
    global verbose
    profiles = get_profiles()
    processes = get_processes(profiles)

    i = {
        'version': '1',
        'profiles': {},
        'processes': {}
    }

    for status in ('enforce', 'complain'):
        filtered_profiles = filter_profiles(profiles, status)
        for item in filtered_profiles:
            i['profiles'][item] = status

    for status in ('enforce', 'complain', 'unconfined'):
        filtered_processes = filter_processes(processes, status)
        for (pid, profile, exe) in filtered_processes:
            if exe not in i['processes']:
                i['processes'][exe] = []

            i['processes'][exe].append({
                'profile': profile,
                'pid': pid,
                'status': status
            })

    if pretty_output:
        sys.stdout.write(json.dumps(i, sort_keys=True, indent=4, separators=(',', ': ')))
    else:
        sys.stdout.write(json.dumps(i))

def cmd_pretty_json():
    cmd_json(True)

def get_profiles():
    '''Fetch loaded profiles'''

    profiles = {}

    if os.path.exists("/sys/module/apparmor"):
        stdmsg("apparmor module is loaded.")
    else:
        errormsg("apparmor module is not loaded.")
        sys.exit(1)

    apparmorfs = find_apparmorfs()
    if not apparmorfs:
        errormsg("apparmor filesystem is not mounted.")
        sys.exit(3)

    apparmor_profiles = os.path.join(apparmorfs, "profiles")
    try:
        f = open(apparmor_profiles)
    except IOError as e:
        if e.errno == errno.EACCES:
            errormsg("You do not have enough privilege to read the profile set.")
        else:
            errormsg("Could not open %s: %s" % (apparmor_profiles, os.strerror(e.errno)))
        sys.exit(4)

    for p in f.readlines():
        match = re.search("^([^\(]+)\s+\((\w+)\)$", p)
        profiles[match.group(1)] = match.group(2)

    f.close()

    return profiles

def get_processes(profiles):
    '''Fetch process list'''
    processes = {}
    contents = os.listdir("/proc")
    for filename in contents:
        if filename.isdigit():
            try:
                for p in open("/proc/%s/attr/current" % filename).readlines():
                    match = re.search("^([^\(]+)\s+\((\w+)\)$", p)
                    exe = os.path.realpath("/proc/%s/exe" % filename)
                    if match:
                        processes[filename] = { 'profile' : match.group(1), \
                                                'exe': exe, \
                                                'mode' : match.group(2) }
                    elif exe in profiles:
                        # keep only unconfined processes that have a profile defined
                        processes[filename] = { 'profile' : exe, \
                                                'exe': exe, \
                                                'mode' : 'unconfined' }
            except:
                pass
    return processes

def filter_profiles(profiles, status):
    '''Return a list of profiles that have a particular status'''
    filtered = []
    for key, value in list(profiles.items()):
        if value == status:
            filtered.append(key)
    filtered.sort()
    return filtered

def filter_processes(processes, status):
    '''Return a list of processes that have a particular status'''
    filtered = []
    for key, value in list(processes.items()):
        if value['mode'] == status:
            filtered.append([key, value['profile'], value['exe']])
    return filtered

def find_apparmorfs():
    '''Finds AppArmor mount point'''
    for p in open("/proc/mounts","rb").readlines():
        if p.split()[2].decode() == "securityfs" and \
           os.path.exists(os.path.join(p.split()[1].decode(), "apparmor")):
            return os.path.join(p.split()[1].decode(), "apparmor")
    return False

def errormsg(message):
    '''Prints to stderr if verbose mode is on'''
    global verbose
    if verbose:
        sys.stderr.write(message + "\n")

def stdmsg(message):
    '''Prints to stdout if verbose mode is on'''
    global verbose
    if verbose:
        sys.stdout.write(message + "\n")

def print_usage():
    '''Print usage information'''
    sys.stdout.write('''Usage: %s [OPTIONS]
Displays various information about the currently loaded AppArmor policy.
OPTIONS (one only):
  --enabled       returns error code if AppArmor not enabled
  --profiled      prints the number of loaded policies
  --enforced      prints the number of loaded enforcing policies
  --complaining   prints the number of loaded non-enforcing policies
  --json          displays multiple data points in machine-readable JSON format
  --pretty-json   same data as --json, formatted for human consumption as well
  --verbose       (default) displays multiple data points about loaded policy set
  --help          this message
''' % sys.argv[0])

# Main
global verbose
verbose = False

if len(sys.argv) > 2:
    sys.stderr.write("Error: Too many options.\n")
    print_usage()
    sys.exit(1)
elif len(sys.argv) == 2:
    cmd = sys.argv.pop(1)
else:
    cmd = '--verbose'

# Command dispatch:
commands = {
    '--enabled'      : cmd_enabled,
    '--profiled'     : cmd_profiled,
    '--enforced'     : cmd_enforced,
    '--complaining'  : cmd_complaining,
    '--json'         : cmd_json,
    '--pretty-json'  : cmd_pretty_json,
    '--verbose'      : cmd_verbose,
    '-v'             : cmd_verbose,
    '--help'         : print_usage,
    '-h'             : print_usage
}

if cmd in commands:
    commands[cmd]()
    sys.exit(0)
else:
    sys.stderr.write("Error: Invalid command.\n")
    print_usage()
    sys.exit(1)
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