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# Copyright 2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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#
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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import re
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import sys
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from image_creator.os_type import OSBase, sysprep
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class Unix(OSBase):
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    sensitive_userdata = [
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        '.bash_history',
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        '.gnupg',
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        '.ssh'
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    ]
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    def __init__(self, rootdev, ghandler, output):
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        super(Unix, self).__init__(rootdev, ghandler, output)
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        self.meta["USERS"] = " ".join(self._get_passworded_users())
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        # Delete the USERS metadata if empty
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        if not len(self.meta['USERS']):
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            self.out.warn("No passworded users found!")
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            del self.meta['USERS']
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    def _get_passworded_users(self):
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        users = []
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        regexp = re.compile('(\S+):((?:!\S+)|(?:[^!*]\S+)|):(?:\S*:){6}')
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        for line in self.g.cat('/etc/shadow').splitlines():
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            match = regexp.match(line)
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            if not match:
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                continue
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            user, passwd = match.groups()
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            if len(passwd) > 0 and passwd[0] == '!':
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                self.out.warn("Ignoring locked %s account." % user)
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            else:
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                users.append(user)
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        return users
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    @sysprep(enabled=False)
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    def remove_user_accounts(self, print_header=True):
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        """Remove all user accounts with id greater than 1000"""
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        if print_header:
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            self.out.output("Removing all user accounts with id greater than "
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                            "1000")
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        if 'USERS' not in self.meta:
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            return
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        # Remove users from /etc/passwd
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        passwd = []
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        removed_users = {}
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        metadata_users = self.meta['USERS'].split()
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        for line in self.g.cat('/etc/passwd').splitlines():
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            fields = line.split(':')
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            if int(fields[2]) > 1000:
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                removed_users[fields[0]] = fields
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                # remove it from the USERS metadata too
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                if fields[0] in metadata_users:
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                    metadata_users.remove(fields[0])
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            else:
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                passwd.append(':'.join(fields))
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        self.meta['USERS'] = " ".join(metadata_users)
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        # Delete the USERS metadata if empty
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        if not len(self.meta['USERS']):
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            del self.meta['USERS']
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        self.g.write('/etc/passwd', '\n'.join(passwd) + '\n')
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        # Remove the corresponding /etc/shadow entries
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        shadow = []
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        for line in self.g.cat('/etc/shadow').splitlines():
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            fields = line.split(':')
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            if fields[0] not in removed_users:
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                shadow.append(':'.join(fields))
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        self.g.write('/etc/shadow', "\n".join(shadow) + '\n')
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        # Remove the corresponding /etc/group entries
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        group = []
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        for line in self.g.cat('/etc/group').splitlines():
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            fields = line.split(':')
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            # Remove groups tha have the same name as the removed users
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            if fields[0] not in removed_users:
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                group.append(':'.join(fields))
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        self.g.write('/etc/group', '\n'.join(group) + '\n')
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        # Remove home directories
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        for home in [field[5] for field in removed_users.values()]:
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            if self.g.is_dir(home) and home.startswith('/home/'):
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                self.g.rm_rf(home)
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    @sysprep()
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    def cleanup_passwords(self, print_header=True):
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        """Remove all passwords and lock all user accounts"""
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        if print_header:
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            self.out.output("Cleaning up passwords & locking all user "
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                            "accounts")
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        shadow = []
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        for line in self.g.cat('/etc/shadow').splitlines():
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            fields = line.split(':')
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            if fields[1] not in ('*', '!'):
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                fields[1] = '!'
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            shadow.append(":".join(fields))
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        self.g.write('/etc/shadow', "\n".join(shadow) + '\n')
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    @sysprep()
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    def cleanup_cache(self, print_header=True):
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        """Remove all regular files under /var/cache"""
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        if print_header:
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            self.out.output('Removing files under /var/cache')
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        self.foreach_file('/var/cache', self.g.rm, ftype='r')
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    @sysprep()
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    def cleanup_tmp(self, print_header=True):
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        """Remove all files under /tmp and /var/tmp"""
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        if print_header:
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            self.out.output('Removing files under /tmp and /var/tmp')
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        self.foreach_file('/tmp', self.g.rm_rf, maxdepth=1)
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        self.foreach_file('/var/tmp', self.g.rm_rf, maxdepth=1)
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    @sysprep()
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    def cleanup_log(self, print_header=True):
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        """Empty all files under /var/log"""
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        if print_header:
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            self.out.output('Emptying all files under /var/log')
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        self.foreach_file('/var/log', self.g.truncate, ftype='r')
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    @sysprep(enabled=False)
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    def cleanup_mail(self, print_header=True):
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        """Remove all files under /var/mail and /var/spool/mail"""
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        if print_header:
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            self.out.output('Removing files under /var/mail & /var/spool/mail')
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        self.foreach_file('/var/spool/mail', self.g.rm_rf, maxdepth=1)
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        self.foreach_file('/var/mail', self.g.rm_rf, maxdepth=1)
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    @sysprep()
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    def cleanup_userdata(self, print_header=True):
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        """Delete sensitive userdata"""
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        homedirs = ['/root'] + self.ls('/home/')
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        if print_header:
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            self.out.output("Removing sensitive user data under %s" %
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                            " ".join(homedirs))
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        for homedir in homedirs:
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            for data in self.sensitive_userdata:
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                fname = "%s/%s" % (homedir, data)
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                if self.g.is_file(fname):
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                    self.g.scrub_file(fname)
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                elif self.g.is_dir(fname):
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                    self.foreach_file(fname, self.g.scrub_file, ftype='r')
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# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :