Synnefo » snf-image-creator

# Copyright 2012 GRNET S.A. All rights reserved.

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import re

import sys

from image_creator.os_type import OSBase, sysprep

class Unix(OSBase):

    sensitive_userdata = [

        '.bash_history',

        '.gnupg',

        '.ssh',

        '.mozilla',

        '.thunderbird'

    ]

    def __init__(self, rootdev, ghandler, output):

        super(Unix, self).__init__(rootdev, ghandler, output)

        self.meta["USERS"] = " ".join(self._get_passworded_users())

    def _get_passworded_users(self):

        users = []

        regexp = re.compile('(\S+):((?:!\S+)|(?:[^!*]\S+)|):(?:\S*:){6}')

        for line in self.g.cat('/etc/shadow').splitlines():

            match = regexp.match(line)

            if not match:

                continue

            user, passwd = match.groups()

            if len(passwd) > 0 and passwd[0] == '!':

                warn("Ignoring locked %s account." % user)

            else:

                users.append(user)

        return users

    @sysprep(enabled=False)

    def remove_user_accounts(self, print_header=True):

        """Remove all user accounts with id greater than 1000"""

        if print_header:

            self.out.output(

                    'Removing all user accounts with id greater than 1000')

        # Remove users from /etc/passwd

        passwd = []

        removed_users = {}

        metadata_users = self.meta['USERS'].split()

        for line in self.g.cat('/etc/passwd').splitlines():

            fields = line.split(':')

            if int(fields[2]) > 1000:

                removed_users[fields[0]] = fields

                # remove it from the USERS metadata too

                if fields[0] in metadata_users:

                    metadata_users.remove(fields[0])

            else:

                passwd.append(':'.join(fields))

        self.meta['USERS'] = " ".join(metadata_users)

        self.g.write('/etc/passwd', '\n'.join(passwd) + '\n')

        # Remove the corresponding /etc/shadow entries

        shadow = []

        for line in self.g.cat('/etc/shadow').splitlines():

            fields = line.split(':')

            if fields[0] not in removed_users:

                shadow.append(':'.join(fields))

        self.g.write('/etc/shadow', "\n".join(shadow) + '\n')

        # Remove the corresponding /etc/group entries

        group = []

        for line in self.g.cat('/etc/group').splitlines():

            fields = line.split(':')

            # Remove groups tha have the same name as the removed users

            if fields[0] not in removed_users:

                group.append(':'.join(fields))

        self.g.write('/etc/group', '\n'.join(group) + '\n')

        # Remove home directories

        for home in [field[5] for field in removed_users.values()]:

            if self.g.is_dir(home) and home.startswith('/home/'):

                self.g.rm_rf(home)

    @sysprep()

    def cleanup_passwords(self, print_header=True):

        """Remove all passwords and lock all user accounts"""

        if print_header:

            self.out.output(

                    'Cleaning up passwords & locking all user accounts')

        shadow = []

        for line in self.g.cat('/etc/shadow').splitlines():

            fields = line.split(':')

            if fields[1] not in ('*', '!'):

                fields[1] = '!'

            shadow.append(":".join(fields))

        self.g.write('/etc/shadow', "\n".join(shadow) + '\n')

    @sysprep()

    def cleanup_cache(self, print_header=True):

        """Remove all regular files under /var/cache"""

        if print_header:

            self.out.output('Removing files under /var/cache')

        self.foreach_file('/var/cache', self.g.rm, ftype='r')

    @sysprep()

    def cleanup_tmp(self, print_header=True):

        """Remove all files under /tmp and /var/tmp"""

        if print_header:

            self.out.output('Removing files under /tmp and /var/tmp')

        self.foreach_file('/tmp', self.g.rm_rf, maxdepth=1)

        self.foreach_file('/var/tmp', self.g.rm_rf, maxdepth=1)

    @sysprep()

    def cleanup_log(self, print_header=True):

        """Empty all files under /var/log"""

        if print_header:

            self.out.output('Emptying all files under /var/log')

        self.foreach_file('/var/log', self.g.truncate, ftype='r')

    @sysprep(enabled=False)

    def cleanup_mail(self, print_header=True):

        """Remove all files under /var/mail and /var/spool/mail"""

        if print_header:

            self.out.output('Removing files under /var/mail & /var/spool/mail')

        self.foreach_file('/var/spool/mail', self.g.rm_rf, maxdepth=1)

        self.foreach_file('/var/mail', self.g.rm_rf, maxdepth=1)

    @sysprep()

    def cleanup_userdata(self, print_header=True):

        """Delete sensitive userdata"""

        homedirs = ['/root'] + self.ls('/home/')

        if print_header:

            self.out.output('Removing sensitive user data under %s' % " ".

                                                        join(homedirs))

        for homedir in homedirs:

            for data in self.sensitive_userdata:

                fname = "%s/%s" % (homedir, data)

                if self.g.is_file(fname):

                    self.g.scrub_file(fname)

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