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Viewing changes to bin/ivle-buildjail

  • Committer: William Grant
  • Date: 2009-04-29 04:58:42 UTC
  • Revision ID: grantw@unimelb.edu.au-20090429045842-upijb1ybcbz1zg6u
Kill --nosvnrevno from setup.install - we don't use Subversion now.

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bin/ivle-buildjail
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import optparse
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import os
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import stat
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import sys
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import shutil
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import ivle.conf
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import ivle.config
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import ivle.jailbuilder.debian
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class UnsafeJail(Exception):
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    pass
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usage = """usage: %prog [options]
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(requires root)
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Builds or updates the base IVLE jail."""
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# Requires root
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if os.getuid() != 0:
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    print >> sys.stderr, "This script requires root privileges to run"
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    sys.exit(1)
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conf = ivle.config.Config()
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build_path = conf['paths']['jails']['template_build']
 
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build_path = ivle.conf.jail_system_build
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# Parse arguments
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parser = optparse.OptionParser(usage)
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    help='''Apply any package updates in the jail.''')
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parser.add_option("-m", "--mirror",
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    action="store", dest="apt_mirror",
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    help="Sets the apt mirror.", default=conf['jail']['mirror'])
 
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    help="Sets the apt mirror.", default="http://archive.ubuntu.com/ubuntu")
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parser.add_option("--python-site-packages",
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    action="store", dest="python_site_packages",
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    help="Path to Python site packages directory inside the jail.",
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              build_path, mirror=options.apt_mirror)
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    ivle.jailbuilder.debian.apt_update_cache(build_path)
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    # Minimal required packages
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    ivle.jailbuilder.debian.apt_install(build_path,
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            ['python2.5', 'python-cjson', 'python-svn', 'python-configobj'])
 
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                        ['python2.5', 'python-cjson', 'python-svn'])
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    ivle.jailbuilder.debian.apt_clean(build_path)
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    ivle.jailbuilder.debian.apt_clean(build_path)
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    # Configure locales to allow en_US.UTF-8 (which IVLE uses)
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    ivle.jailbuilder.debian._execute_in_chroot(build_path,
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        ['locale-gen', 'en_US.UTF-8'])
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if conf['jail']['devmode']:
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    # Copy all console and operating system files into the jail
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    services_path = os.path.join(conf['paths']['share'], 'services')
 
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    services_path = os.path.join(ivle.conf.share_path, 'services')
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    jail_services_path = os.path.join(build_path, services_path[1:])
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    if os.path.exists(jail_services_path):
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        shutil.rmtree(jail_services_path)
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        shutil.rmtree(jail_site_packages)
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    shutil.copytree(ivle_site_packages, jail_site_packages)
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    # And finally copy in /etc/hosts, /etc/resolv.conf and /etc/hostname,
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    # so name resolution is less unlikely to work.
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    shutil.copy(
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        '/etc/resolv.conf', os.path.join(build_path, 'etc/resolv.conf'))
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    shutil.copy('/etc/hosts', os.path.join(build_path, 'etc/hosts'))
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    shutil.copy('/etc/hostname', os.path.join(build_path, 'etc/hostname'))
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# Make /tmp and /var/lock un-world-writable. /tmp will be mounted over,
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# and /var/{lock,tmp} should die.
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for path in ('tmp', 'var/lock', 'var/tmp'):
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    path = os.path.join(build_path, path)
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    os.chmod(path, os.stat(path).st_mode & ~stat.S_IWOTH)
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# Verify that nothing in the jail is world-writable.
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# We don't want students to write into places that others can see.
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try:
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    for path, dirs, files in os.walk(build_path):
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        for dname in dirs:
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            d = os.path.join(path, dname)
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            if os.path.islink(d):
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                continue
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            if os.stat(d).st_mode & stat.S_IWOTH:
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                raise UnsafeJail(d)
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        for fname in files:
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            f = os.path.join(path, fname)
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            if os.path.islink(f):
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                continue
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            if os.stat(f).st_mode & stat.S_IWOTH:
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                if (os.path.dirname(f) == os.path.join(build_path, 'dev') and
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                    os.path.basename(f) in ('ptmx', 'null', 'tty', 'full', 'zero',
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                                            'random', 'urandom')
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                    ):
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                    continue
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                raise UnsafeJail(f)
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except UnsafeJail, e:
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    print >> sys.stderr,"""Error: Jail contains world writable path: '%s'.
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This is a security vulnerability as jail template contents are shared between 
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users. Please either make this path world unwriteable or remove it from the 
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jail."""%str(e)
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    sys.exit(1)
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# Copy jail template build to actual jail template
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template_path = conf['paths']['jails']['template']
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if os.spawnvp(os.P_WAIT, 'rsync', ['rsync', '-a', '--delete',
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              build_path + '/', template_path]) != 0:
 
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              build_path + '/', ivle.conf.jail_system]) != 0:
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    print >> sys.stderr, "Jail copying failed."
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    sys.exit(1)
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# Now mangle things a bit, so we can bind-mount the user bits in.
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# /etc/passwd and /etc/ivle/ivle.conf need to be symlinks to somewhere in /home
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os.rename(os.path.join(template_path, 'etc/passwd'),
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          os.path.join(template_path, 'home/.passwd')
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          )
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os.symlink('../home/.passwd', os.path.join(template_path, 'etc/passwd'))
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os.makedirs(os.path.join(template_path, "etc/ivle"))
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os.symlink('../../home/.ivle.conf',
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           os.path.join(template_path, "etc/ivle/ivle.conf"))