# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import crypt

import random

import string

from oslo_log import log

from ironic_python_agent.extensions import base

LOG = log.getLogger()

PASSWORD_FILE = '/etc/ipa-rescue-config/ipa-rescue-password'

class RescueExtension(base.BaseAgentExtension):

def make_salt(self):

"""Generate a random salt for hashing the rescue password.

Salt should be a two-character string from the set [a-zA-Z0-9].

:returns: a valid salt for use with crypt.crypt

"""

allowed_chars = string.ascii_letters + string.digits

return random.choice(allowed_chars) + random.choice(allowed_chars)

def write_rescue_password(self, rescue_password=""):

"""Write rescue password to a file for use after IPA exits.

:param rescue_password: Rescue password.

"""

LOG.debug('Writing hashed rescue password to %s', PASSWORD_FILE)

salt = self.make_salt()

hashed_password = crypt.crypt(rescue_password, salt)

try:

with open(PASSWORD_FILE, 'w') as f:

f.write(hashed_password)

except IOError as e:

msg = ("Rescue Operation failed when writing the hashed rescue "

"password to the password file. Error %s") % e

LOG.exception(msg)

raise IOError(msg)

@base.sync_command('finalize_rescue')

def finalize_rescue(self, rescue_password=""):

"""Sets the rescue password for the rescue user."""

self.write_rescue_password(rescue_password)

# IPA will terminate after the result of finalize_rescue is returned to

# ironic to avoid exposing the IPA API to a tenant or public network

self.agent.serve_api = False

return