# Authors:
#   Endi S. Dewata <edewata@redhat.com>
#
# Copyright (C) 2015  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import print_function

import base64
import getpass
import io
import json
import os
import sys
import tempfile

from cryptography.fernet import Fernet, InvalidToken
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives.serialization import load_pem_public_key,\
    load_pem_private_key

import nss.nss as nss

from ipalib.frontend import Command, Object, Local
from ipalib import api, errors
from ipalib import Bytes, Flag, Str, StrEnum
from ipalib import output
from ipalib.crud import PKQuery, Retrieve, Update
from ipalib.plugable import Registry
from ipalib.plugins.baseldap import LDAPObject, LDAPCreate, LDAPDelete,\
    LDAPSearch, LDAPUpdate, LDAPRetrieve, LDAPAddMember, LDAPRemoveMember,\
    LDAPModMember, pkey_to_value
from ipalib.request import context
from ipalib.plugins.user import split_principal
from ipalib.plugins.service import normalize_principal
from ipalib import _, ngettext
from ipaplatform.paths import paths
from ipapython.dn import DN
from ipapython.nsslib import current_dbdir

if api.env.in_server:
    import pki.account
    import pki.key

__doc__ = _("""
Vaults
""") + _("""
Manage vaults.
""") + _("""
Vault is a secure place to store a secret.
""") + _("""
Based on the ownership there are three vault categories:
* user/private vault
* service vault
* shared vault
""") + _("""
User vaults are vaults owned used by a particular user. Private
vaults are vaults owned the current user. Service vaults are
vaults owned by a service. Shared vaults are owned by the admin
but they can be used by other users or services.
""") + _("""
Based on the security mechanism there are three types of
vaults:
* standard vault
* symmetric vault
* asymmetric vault
""") + _("""
Standard vault uses a secure mechanism to transport and
store the secret. The secret can only be retrieved by users
that have access to the vault.
""") + _("""
Symmetric vault is similar to the standard vault, but it
pre-encrypts the secret using a password before transport.
The secret can only be retrieved using the same password.
""") + _("""
Asymmetric vault is similar to the standard vault, but it
pre-encrypts the secret using a public key before transport.
The secret can only be retrieved using the private key.
""") + _("""
EXAMPLES:
""") + _("""
 List vaults:
   ipa vault-find
       [--user <user>|--service <service>|--shared]
""") + _("""
 Add a standard vault:
   ipa vault-add <name>
       [--user <user>|--service <service>|--shared]
       --type standard
""") + _("""
 Add a symmetric vault:
   ipa vault-add <name>
       [--user <user>|--service <service>|--shared]
       --type symmetric --password-file password.txt
""") + _("""
 Add an asymmetric vault:
   ipa vault-add <name>
       [--user <user>|--service <service>|--shared]
       --type asymmetric --public-key-file public.pem
""") + _("""
 Show a vault:
   ipa vault-show <name>
       [--user <user>|--service <service>|--shared]
""") + _("""
 Modify vault description:
   ipa vault-mod <name>
       [--user <user>|--service <service>|--shared]
       --desc <description>
""") + _("""
 Modify vault type:
   ipa vault-mod <name>
       [--user <user>|--service <service>|--shared]
       --type <type>
       [old password/private key]
       [new password/public key]
""") + _("""
 Modify symmetric vault password:
   ipa vault-mod <name>
       [--user <user>|--service <service>|--shared]
       --change-password
   ipa vault-mod <name>
       [--user <user>|--service <service>|--shared]
       --old-password <old password>
       --new-password <new password>
   ipa vault-mod <name>
       [--user <user>|--service <service>|--shared]
       --old-password-file <old password file>
       --new-password-file <new password file>
""") + _("""
 Modify asymmetric vault keys:
   ipa vault-mod <name>
       [--user <user>|--service <service>|--shared]
       --private-key-file <old private key file>
       --public-key-file <new public key file>
""") + _("""
 Delete a vault:
   ipa vault-del <name>
       [--user <user>|--service <service>|--shared]
""") + _("""
 Display vault configuration:
   ipa vaultconfig-show
""") + _("""
 Archive data into standard vault:
   ipa vault-archive <name>
       [--user <user>|--service <service>|--shared]
       --in <input file>
""") + _("""
 Archive data into symmetric vault:
   ipa vault-archive <name>
       [--user <user>|--service <service>|--shared]
       --in <input file>
       --password-file password.txt
""") + _("""
 Archive data into asymmetric vault:
   ipa vault-archive <name>
       [--user <user>|--service <service>|--shared]
       --in <input file>
""") + _("""
 Retrieve data from standard vault:
   ipa vault-retrieve <name>
       [--user <user>|--service <service>|--shared]
       --out <output file>
""") + _("""
 Retrieve data from symmetric vault:
   ipa vault-retrieve <name>
       [--user <user>|--service <service>|--shared]
       --out <output file>
       --password-file password.txt
""") + _("""
 Retrieve data from asymmetric vault:
   ipa vault-retrieve <name>
       [--user <user>|--service <service>|--shared]
       --out <output file> --private-key-file private.pem
""") + _("""
 Add vault owners:
   ipa vault-add-owner <name>
       [--user <user>|--service <service>|--shared]
       [--users <users>]  [--groups <groups>] [--services <services>]
""") + _("""
 Delete vault owners:
   ipa vault-remove-owner <name>
       [--user <user>|--service <service>|--shared]
       [--users <users>] [--groups <groups>] [--services <services>]
""") + _("""
 Add vault members:
   ipa vault-add-member <name>
       [--user <user>|--service <service>|--shared]
       [--users <users>] [--groups <groups>] [--services <services>]
""") + _("""
 Delete vault members:
   ipa vault-remove-member <name>
       [--user <user>|--service <service>|--shared]
       [--users <users>] [--groups <groups>] [--services <services>]
""")


def validated_read(argname, filename, mode='r', encoding=None):
    """Read file and catch errors

    IOError and UnicodeError (for text files) are turned into a
    ValidationError
    """
    try:
        with io.open(filename, mode=mode, encoding=encoding) as f:
            data = f.read()
    except IOError as exc:
        raise errors.ValidationError(
            name=argname,
            error=_("Cannot read file '%(filename)s': %(exc)s") % {
                'filename': filename, 'exc': exc[1]
                }
        )
    except UnicodeError as exc:
        raise errors.ValidationError(
            name=argname,
            error=_("Cannot decode file '%(filename)s': %(exc)s") % {
                'filename': filename, 'exc': exc
                }
        )
    return data


register = Registry()

MAX_VAULT_DATA_SIZE = 2**20  # = 1 MB

vault_options = (
    Str(
        'service?',
        doc=_('Service name of the service vault'),
        normalizer=normalize_principal,
    ),
    Flag(
        'shared?',
        doc=_('Shared vault'),
    ),
    Str(
        'username?',
        cli_name='user',
        doc=_('Username of the user vault'),
    ),
)


class VaultModMember(LDAPModMember):
    def get_options(self):
        for param in super(VaultModMember, self).get_options():
            if param.name == 'service' and param not in vault_options:
                param = param.clone_rename('services')
            yield param

    def get_member_dns(self, **options):
        if 'services' in options:
            options['service'] = options.pop('services')
        else:
            options.pop('service', None)
        return super(VaultModMember, self).get_member_dns(**options)

    def post_callback(self, ldap, completed, failed, dn, entry_attrs, *keys, **options):
        for fail in failed.itervalues():
            fail['services'] = fail.pop('service', [])
        self.obj.get_container_attribute(entry_attrs, options)
        return completed, dn


@register()
class vaultcontainer(LDAPObject):
    __doc__ = _("""
    Vault Container object.
    """)

    container_dn = api.env.container_vault

    object_name = _('vaultcontainer')
    object_name_plural = _('vaultcontainers')
    object_class = ['ipaVaultContainer']
    permission_filter_objectclasses = ['ipaVaultContainer']

    attribute_members = {
        'owner': ['user', 'group', 'service'],
    }

    label = _('Vault Containers')
    label_singular = _('Vault Container')

    managed_permissions = {
        'System: Read Vault Containers': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'read', 'search', 'compare'},
            'ipapermdefaultattr': {
                'objectclass', 'cn', 'description', 'owner',
            },
            'default_privileges': {'Vault Administrators'},
        },
        'System: Add Vault Containers': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'add'},
            'default_privileges': {'Vault Administrators'},
        },
        'System: Delete Vault Containers': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'delete'},
            'default_privileges': {'Vault Administrators'},
        },
        'System: Modify Vault Containers': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'write'},
            'ipapermdefaultattr': {
                'objectclass', 'cn', 'description',
            },
            'default_privileges': {'Vault Administrators'},
        },
        'System: Manage Vault Container Ownership': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'write'},
            'ipapermdefaultattr': {
                'owner',
            },
            'default_privileges': {'Vault Administrators'},
        },
    }

    takes_params = (
        Str(
            'owner_user?',
            label=_('Owner users'),
        ),
        Str(
            'owner_group?',
            label=_('Owner groups'),
        ),
        Str(
            'owner_service?',
            label=_('Owner services'),
        ),
        Str(
            'owner?',
            label=_('Failed owners'),
        ),
        Str(
            'service?',
            label=_('Vault service'),
            flags={'virtual_attribute'},
        ),
        Flag(
            'shared?',
            label=_('Shared vault'),
            flags={'virtual_attribute'},
        ),
        Str(
            'username?',
            label=_('Vault user'),
            flags={'virtual_attribute'},
        ),
    )

    def get_dn(self, *keys, **options):
        """
        Generates vault DN from parameters.
        """
        service = options.get('service')
        shared = options.get('shared')
        user = options.get('username')

        count = (bool(service) + bool(shared) + bool(user))
        if count > 1:
            raise errors.MutuallyExclusiveError(
                reason=_('Service, shared and user options ' +
                         'cannot be specified simultaneously'))

        parent_dn = super(vaultcontainer, self).get_dn(*keys, **options)

        if not count:
            principal = getattr(context, 'principal')

            if principal.startswith('host/'):
                raise errors.NotImplementedError(
                    reason=_('Host is not supported'))

            (name, realm) = split_principal(principal)
            if '/' in name:
                service = name
            else:
                user = name

        if service:
            dn = DN(('cn', service), ('cn', 'services'), parent_dn)
        elif shared:
            dn = DN(('cn', 'shared'), parent_dn)
        elif user:
            dn = DN(('cn', user), ('cn', 'users'), parent_dn)
        else:
            raise RuntimeError

        return dn

    def get_container_attribute(self, entry, options):
        if options.get('raw', False):
            return
        container_dn = DN(self.container_dn, self.api.env.basedn)
        if entry.dn.endswith(DN(('cn', 'services'), container_dn)):
            entry['service'] = entry.dn[0]['cn']
        elif entry.dn.endswith(DN(('cn', 'shared'), container_dn)):
            entry['shared'] = True
        elif entry.dn.endswith(DN(('cn', 'users'), container_dn)):
            entry['username'] = entry.dn[0]['cn']


@register()
class vaultcontainer_show(LDAPRetrieve):
    __doc__ = _('Display information about a vault container.')

    takes_options = LDAPRetrieve.takes_options + vault_options

    has_output_params = LDAPRetrieve.has_output_params

    def pre_callback(self, ldap, dn, attrs_list, *keys, **options):
        assert isinstance(dn, DN)

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        return dn

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        self.obj.get_container_attribute(entry_attrs, options)
        return dn


@register()
class vaultcontainer_del(LDAPDelete):
    __doc__ = _('Delete a vault container.')

    takes_options = LDAPDelete.takes_options + vault_options

    msg_summary = _('Deleted vault container')

    subtree_delete = False

    def pre_callback(self, ldap, dn, *keys, **options):
        assert isinstance(dn, DN)

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        return dn

    def execute(self, *keys, **options):
        keys = keys + (u'',)
        return super(vaultcontainer_del, self).execute(*keys, **options)


@register()
class vaultcontainer_add_owner(VaultModMember, LDAPAddMember):
    __doc__ = _('Add owners to a vault container.')

    takes_options = LDAPAddMember.takes_options + vault_options

    member_attributes = ['owner']
    member_param_label = _('owner %s')
    member_count_out = ('%i owner added.', '%i owners added.')

    has_output = (
        output.Entry('result'),
        output.Output(
            'failed',
            type=dict,
            doc=_('Owners that could not be added'),
        ),
        output.Output(
            'completed',
            type=int,
            doc=_('Number of owners added'),
        ),
    )


@register()
class vaultcontainer_remove_owner(VaultModMember, LDAPRemoveMember):
    __doc__ = _('Remove owners from a vault container.')

    takes_options = LDAPRemoveMember.takes_options + vault_options

    member_attributes = ['owner']
    member_param_label = _('owner %s')
    member_count_out = ('%i owner removed.', '%i owners removed.')

    has_output = (
        output.Entry('result'),
        output.Output(
            'failed',
            type=dict,
            doc=_('Owners that could not be removed'),
        ),
        output.Output(
            'completed',
            type=int,
            doc=_('Number of owners removed'),
        ),
    )


@register()
class vault(LDAPObject):
    __doc__ = _("""
    Vault object.
    """)

    container_dn = api.env.container_vault

    object_name = _('vault')
    object_name_plural = _('vaults')

    object_class = ['ipaVault']
    permission_filter_objectclasses = ['ipaVault']
    default_attributes = [
        'cn',
        'description',
        'ipavaulttype',
        'ipavaultsalt',
        'ipavaultpublickey',
        'owner',
        'member',
    ]
    search_display_attributes = [
        'cn',
        'description',
        'ipavaulttype',
    ]
    attribute_members = {
        'owner': ['user', 'group', 'service'],
        'member': ['user', 'group', 'service'],
    }

    label = _('Vaults')
    label_singular = _('Vault')

    managed_permissions = {
        'System: Read Vaults': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'read', 'search', 'compare'},
            'ipapermdefaultattr': {
                'objectclass', 'cn', 'description', 'ipavaulttype',
                'ipavaultsalt', 'ipavaultpublickey', 'owner', 'member',
                'memberuser', 'memberhost',
            },
            'default_privileges': {'Vault Administrators'},
        },
        'System: Add Vaults': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'add'},
            'default_privileges': {'Vault Administrators'},
        },
        'System: Delete Vaults': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'delete'},
            'default_privileges': {'Vault Administrators'},
        },
        'System: Modify Vaults': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'write'},
            'ipapermdefaultattr': {
                'objectclass', 'cn', 'description', 'ipavaulttype',
                'ipavaultsalt', 'ipavaultpublickey',
            },
            'default_privileges': {'Vault Administrators'},
        },
        'System: Manage Vault Ownership': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'write'},
            'ipapermdefaultattr': {
                'owner',
            },
            'default_privileges': {'Vault Administrators'},
        },
        'System: Manage Vault Membership': {
            'ipapermlocation': api.env.basedn,
            'ipapermtarget': DN(api.env.container_vault, api.env.basedn),
            'ipapermright': {'write'},
            'ipapermdefaultattr': {
                'member',
            },
            'default_privileges': {'Vault Administrators'},
        },
    }

    takes_params = (
        Str(
            'cn',
            cli_name='name',
            label=_('Vault name'),
            primary_key=True,
            pattern='^[a-zA-Z0-9_.-]+$',
            pattern_errmsg='may only include letters, numbers, _, ., and -',
            maxlength=255,
        ),
        Str(
            'description?',
            cli_name='desc',
            label=_('Description'),
            doc=_('Vault description'),
        ),
        StrEnum(
            'ipavaulttype?',
            cli_name='type',
            label=_('Type'),
            doc=_('Vault type'),
            values=(u'standard', u'symmetric', u'asymmetric', ),
            default=u'symmetric',
            autofill=True,
        ),
        Bytes(
            'ipavaultsalt?',
            cli_name='salt',
            label=_('Salt'),
            doc=_('Vault salt'),
            flags=['no_search'],
        ),
        Bytes(
            'ipavaultpublickey?',
            cli_name='public_key',
            label=_('Public key'),
            doc=_('Vault public key'),
            flags=['no_search'],
        ),
        Str(
            'owner_user?',
            label=_('Owner users'),
            flags=['no_create', 'no_update', 'no_search'],
        ),
        Str(
            'owner_group?',
            label=_('Owner groups'),
            flags=['no_create', 'no_update', 'no_search'],
        ),
        Str(
            'owner_service?',
            label=_('Owner services'),
            flags=['no_create', 'no_update', 'no_search'],
        ),
        Str(
            'owner?',
            label=_('Failed owners'),
            flags=['no_create', 'no_update', 'no_search'],
        ),
        Str(
            'service?',
            label=_('Vault service'),
            flags={'virtual_attribute', 'no_create', 'no_update', 'no_search'},
        ),
        Flag(
            'shared?',
            label=_('Shared vault'),
            flags={'virtual_attribute', 'no_create', 'no_update', 'no_search'},
        ),
        Str(
            'username?',
            label=_('Vault user'),
            flags={'virtual_attribute', 'no_create', 'no_update', 'no_search'},
        ),
    )

    def get_dn(self, *keys, **options):
        """
        Generates vault DN from parameters.
        """
        service = options.get('service')
        shared = options.get('shared')
        user = options.get('username')

        count = (bool(service) + bool(shared) + bool(user))
        if count > 1:
            raise errors.MutuallyExclusiveError(
                reason=_('Service, shared, and user options ' +
                         'cannot be specified simultaneously'))

        # TODO: create container_dn after object initialization then reuse it
        container_dn = DN(self.container_dn, self.api.env.basedn)

        dn = super(vault, self).get_dn(*keys, **options)
        assert dn.endswith(container_dn)
        rdns = DN(*dn[:-len(container_dn)])

        if not count:
            principal = getattr(context, 'principal')

            if principal.startswith('host/'):
                raise errors.NotImplementedError(
                    reason=_('Host is not supported'))

            (name, realm) = split_principal(principal)
            if '/' in name:
                service = name
            else:
                user = name

        if service:
            parent_dn = DN(('cn', service), ('cn', 'services'), container_dn)
        elif shared:
            parent_dn = DN(('cn', 'shared'), container_dn)
        elif user:
            parent_dn = DN(('cn', user), ('cn', 'users'), container_dn)
        else:
            raise RuntimeError

        return DN(rdns, parent_dn)

    def create_container(self, dn, owner_dn):
        """
        Creates vault container and its parents.
        """

        # TODO: create container_dn after object initialization then reuse it
        container_dn = DN(self.container_dn, self.api.env.basedn)

        entries = []

        while dn:
            assert dn.endswith(container_dn)

            rdn = dn[0]
            entry = self.backend.make_entry(
                dn,
                {
                    'objectclass': ['ipaVaultContainer'],
                    'cn': rdn['cn'],
                    'owner': [owner_dn],
                })

            # if entry can be added, return
            try:
                self.backend.add_entry(entry)
                break

            except errors.NotFound:
                pass

            # otherwise, create parent entry first
            dn = DN(*dn[1:])
            entries.insert(0, entry)

        # then create the entries again
        for entry in entries:
            self.backend.add_entry(entry)

    def get_key_id(self, dn):
        """
        Generates a client key ID to archive/retrieve data in KRA.
        """

        # TODO: create container_dn after object initialization then reuse it
        container_dn = DN(self.container_dn, self.api.env.basedn)

        # make sure the DN is a vault DN
        if not dn.endswith(container_dn, 1):
            raise ValueError('Invalid vault DN: %s' % dn)

        # construct the vault ID from the bottom up
        id = u''
        for rdn in dn[:-len(container_dn)]:
            name = rdn['cn']
            id = u'/' + name + id

        return 'ipa:' + id

    def get_new_password(self):
        """
        Gets new password from user and verify it.
        """
        while True:
            password = getpass.getpass('New password: ').decode(
                sys.stdin.encoding)
            password2 = getpass.getpass('Verify password: ').decode(
                sys.stdin.encoding)

            if password == password2:
                return password

            print('  ** Passwords do not match! **')

    def get_existing_password(self):
        """
        Gets existing password from user.
        """
        return getpass.getpass('Password: ').decode(sys.stdin.encoding)

    def generate_symmetric_key(self, password, salt):
        """
        Generates symmetric key from password and salt.
        """
        kdf = PBKDF2HMAC(
            algorithm=hashes.SHA256(),
            length=32,
            salt=salt,
            iterations=100000,
            backend=default_backend()
        )

        return base64.b64encode(kdf.derive(password.encode('utf-8')))

    def encrypt(self, data, symmetric_key=None, public_key=None):
        """
        Encrypts data with symmetric key or public key.
        """
        if symmetric_key:
            fernet = Fernet(symmetric_key)
            return fernet.encrypt(data)

        elif public_key:
            public_key_obj = load_pem_public_key(
                data=public_key,
                backend=default_backend()
            )
            return public_key_obj.encrypt(
                data,
                padding.OAEP(
                    mgf=padding.MGF1(algorithm=hashes.SHA1()),
                    algorithm=hashes.SHA1(),
                    label=None
                )
            )

    def decrypt(self, data, symmetric_key=None, private_key=None):
        """
        Decrypts data with symmetric key or public key.
        """
        if symmetric_key:
            try:
                fernet = Fernet(symmetric_key)
                return fernet.decrypt(data)
            except InvalidToken:
                raise errors.AuthenticationError(
                    message=_('Invalid credentials'))

        elif private_key:
            try:
                private_key_obj = load_pem_private_key(
                    data=private_key,
                    password=None,
                    backend=default_backend()
                )
                return private_key_obj.decrypt(
                    data,
                    padding.OAEP(
                        mgf=padding.MGF1(algorithm=hashes.SHA1()),
                        algorithm=hashes.SHA1(),
                        label=None
                    )
                )
            except AssertionError:
                raise errors.AuthenticationError(
                    message=_('Invalid credentials'))

    def get_container_attribute(self, entry, options):
        if options.get('raw', False):
            return
        container_dn = DN(self.container_dn, self.api.env.basedn)
        if entry.dn.endswith(DN(('cn', 'services'), container_dn)):
            entry['service'] = entry.dn[1]['cn']
        elif entry.dn.endswith(DN(('cn', 'shared'), container_dn)):
            entry['shared'] = True
        elif entry.dn.endswith(DN(('cn', 'users'), container_dn)):
            entry['username'] = entry.dn[1]['cn']


@register()
class vault_add(PKQuery, Local):
    __doc__ = _('Create a new vault.')

    takes_options = LDAPCreate.takes_options + vault_options + (
        Str(
            'description?',
            cli_name='desc',
            doc=_('Vault description'),
        ),
        StrEnum(
            'ipavaulttype?',
            cli_name='type',
            label=_('Type'),
            doc=_('Vault type'),
            values=(u'standard', u'symmetric', u'asymmetric', ),
            default=u'symmetric',
            autofill=True,
        ),
        Str(
            'password?',
            cli_name='password',
            doc=_('Vault password'),
        ),
        Str(  # TODO: use File parameter
            'password_file?',
            cli_name='password_file',
            doc=_('File containing the vault password'),
        ),
        Bytes(
            'ipavaultpublickey?',
            cli_name='public_key',
            doc=_('Vault public key'),
        ),
        Str(  # TODO: use File parameter
            'public_key_file?',
            cli_name='public_key_file',
            doc=_('File containing the vault public key'),
        ),
    )

    has_output = output.standard_entry

    def forward(self, *args, **options):

        vault_type = options.get('ipavaulttype')
        password = options.get('password')
        password_file = options.get('password_file')
        public_key = options.get('ipavaultpublickey')
        public_key_file = options.get('public_key_file')

        # don't send these parameters to server
        if 'password' in options:
            del options['password']
        if 'password_file' in options:
            del options['password_file']
        if 'public_key_file' in options:
            del options['public_key_file']

        if vault_type != u'symmetric' and (password or password_file):
            raise errors.MutuallyExclusiveError(
                reason=_('Password can be specified only for '
                         'symmetric vault')
            )

        if vault_type != u'asymmetric' and (public_key or public_key_file):
            raise errors.MutuallyExclusiveError(
                reason=_('Public key can be specified only for '
                         'asymmetric vault')
            )

        if self.api.env.in_server:
            backend = self.api.Backend.ldap2
        else:
            backend = self.api.Backend.rpcclient
        if not backend.isconnected():
            backend.connect()

        if vault_type == u'standard':

            pass

        elif vault_type == u'symmetric':

            # get password
            if password and password_file:
                raise errors.MutuallyExclusiveError(
                    reason=_('Password specified multiple times'))

            elif password:
                pass

            elif password_file:
                password = validated_read('password-file',
                                          password_file,
                                          encoding='utf-8')
                password = password.rstrip('\n')

            else:
                password = self.obj.get_new_password()

            # generate vault salt
            options['ipavaultsalt'] = os.urandom(16)

        elif vault_type == u'asymmetric':

            # get new vault public key
            if public_key and public_key_file:
                raise errors.MutuallyExclusiveError(
                    reason=_('Public key specified multiple times'))

            elif public_key:
                pass

            elif public_key_file:
                public_key = validated_read('public-key-file',
                                            public_key_file,
                                            mode='rb')

                # store vault public key
                options['ipavaultpublickey'] = public_key

            else:
                raise errors.ValidationError(
                    name='ipavaultpublickey',
                    error=_('Missing vault public key'))

            # validate public key and prevent users from accidentally
            # sending a private key to the server.
            try:
                load_pem_public_key(
                    data=public_key,
                    backend=default_backend()
                )
            except ValueError as e:
                raise errors.ValidationError(
                    name='ipavaultpublickey',
                    error=_('Invalid or unsupported vault public key: %s') % e,
                )

        # create vault
        response = self.api.Command.vault_add_internal(*args, **options)

        # prepare parameters for archival
        opts = options.copy()
        if 'description' in opts:
            del opts['description']
        if 'ipavaulttype' in opts:
            del opts['ipavaulttype']

        if vault_type == u'symmetric':
            opts['password'] = password
            del opts['ipavaultsalt']

        elif vault_type == u'asymmetric':
            del opts['ipavaultpublickey']

        # archive blank data
        self.api.Command.vault_archive(*args, **opts)

        return response


@register()
class vault_add_internal(LDAPCreate):

    NO_CLI = True

    takes_options = vault_options

    msg_summary = _('Added vault "%(value)s"')

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                     **options):
        assert isinstance(dn, DN)

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        principal = getattr(context, 'principal')
        (name, realm) = split_principal(principal)
        if '/' in name:
            owner_dn = self.api.Object.service.get_dn(name)
        else:
            owner_dn = self.api.Object.user.get_dn(name)

        parent_dn = DN(*dn[1:])

        try:
            self.obj.create_container(parent_dn, owner_dn)
        except errors.DuplicateEntry as e:
            pass

        # vault should be owned by the creator
        entry_attrs['owner'] = owner_dn

        return dn

    def post_callback(self, ldap, dn, entry, *keys, **options):
        self.obj.get_container_attribute(entry, options)
        return dn


@register()
class vault_del(LDAPDelete):
    __doc__ = _('Delete a vault.')

    takes_options = LDAPDelete.takes_options + vault_options

    msg_summary = _('Deleted vault "%(value)s"')

    def pre_callback(self, ldap, dn, *keys, **options):
        assert isinstance(dn, DN)

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        return dn

    def post_callback(self, ldap, dn, *args, **options):
        assert isinstance(dn, DN)

        kra_client = self.api.Backend.kra.get_client()

        kra_account = pki.account.AccountClient(kra_client.connection)
        kra_account.login()

        client_key_id = self.obj.get_key_id(dn)

        # deactivate vault record in KRA
        response = kra_client.keys.list_keys(
            client_key_id, pki.key.KeyClient.KEY_STATUS_ACTIVE)

        for key_info in response.key_infos:
            kra_client.keys.modify_key_status(
                key_info.get_key_id(),
                pki.key.KeyClient.KEY_STATUS_INACTIVE)

        kra_account.logout()

        return True


@register()
class vault_find(LDAPSearch):
    __doc__ = _('Search for vaults.')

    takes_options = LDAPSearch.takes_options + vault_options + (
        Flag(
            'services?',
            doc=_('List all service vaults'),
        ),
        Flag(
            'users?',
            doc=_('List all user vaults'),
        ),
    )

    has_output_params = LDAPSearch.has_output_params

    msg_summary = ngettext(
        '%(count)d vault matched',
        '%(count)d vaults matched',
        0,
    )

    def pre_callback(self, ldap, filter, attrs_list, base_dn, scope, *args,
                     **options):
        assert isinstance(base_dn, DN)

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        if options.get('users') or options.get('services'):
            mutex = ['service', 'services', 'shared', 'username', 'users']
            count = sum(bool(options.get(option)) for option in mutex)
            if count > 1:
                raise errors.MutuallyExclusiveError(
                    reason=_('Service(s), shared, and user(s) options ' +
                             'cannot be specified simultaneously'))

            scope = ldap.SCOPE_SUBTREE
            container_dn = DN(self.obj.container_dn,
                              self.api.env.basedn)

            if options.get('services'):
                base_dn = DN(('cn', 'services'), container_dn)
            else:
                base_dn = DN(('cn', 'users'), container_dn)
        else:
            base_dn = self.obj.get_dn(None, **options)

        return filter, base_dn, scope

    def post_callback(self, ldap, entries, truncated, *args, **options):
        for entry in entries:
            self.obj.get_container_attribute(entry, options)
        return truncated

    def exc_callback(self, args, options, exc, call_func, *call_args,
                     **call_kwargs):
        if call_func.__name__ == 'find_entries':
            if isinstance(exc, errors.NotFound):
                # ignore missing containers since they will be created
                # automatically on vault creation.
                raise errors.EmptyResult(reason=str(exc))

        raise exc


@register()
class vault_mod(PKQuery, Local):
    __doc__ = _('Modify a vault.')

    takes_options = vault_options + (
        Str(
            'description?',
            cli_name='desc',
            doc=_('Vault description'),
        ),
        Str(
            'ipavaulttype?',
            cli_name='type',
            doc=_('Vault type'),
        ),
        Bytes(
            'ipavaultsalt?',
            cli_name='salt',
            doc=_('Vault salt'),
        ),
        Flag(
            'change_password?',
            doc=_('Change password'),
        ),
        Str(
            'old_password?',
            cli_name='old_password',
            doc=_('Old vault password'),
        ),
        Str(  # TODO: use File parameter
            'old_password_file?',
            cli_name='old_password_file',
            doc=_('File containing the old vault password'),
        ),
        Str(
            'new_password?',
            cli_name='new_password',
            doc=_('New vault password'),
        ),
        Str(  # TODO: use File parameter
            'new_password_file?',
            cli_name='new_password_file',
            doc=_('File containing the new vault password'),
        ),
        Bytes(
            'private_key?',
            cli_name='private_key',
            doc=_('Old vault private key'),
        ),
        Str(  # TODO: use File parameter
            'private_key_file?',
            cli_name='private_key_file',
            doc=_('File containing the old vault private key'),
        ),
        Bytes(
            'ipavaultpublickey?',
            cli_name='public_key',
            doc=_('New vault public key'),
        ),
        Str(  # TODO: use File parameter
            'public_key_file?',
            cli_name='public_key_file',
            doc=_('File containing the new vault public key'),
        ),
    )

    has_output = output.standard_entry

    def forward(self, *args, **options):

        vault_type = options.pop('ipavaulttype', False)
        salt = options.pop('ipavaultsalt', False)
        change_password = options.pop('change_password', False)

        old_password = options.pop('old_password', None)
        old_password_file = options.pop('old_password_file', None)
        new_password = options.pop('new_password', None)
        new_password_file = options.pop('new_password_file', None)

        old_private_key = options.pop('private_key', None)
        old_private_key_file = options.pop('private_key_file', None)
        new_public_key = options.pop('ipavaultpublickey', None)
        new_public_key_file = options.pop('public_key_file', None)

        if self.api.env.in_server:
            backend = self.api.Backend.ldap2
        else:
            backend = self.api.Backend.rpcclient
        if not backend.isconnected():
            backend.connect()

        # determine the vault type based on parameters specified
        if vault_type:
            pass

        elif change_password or new_password or new_password_file or salt:
            vault_type = u'symmetric'

        elif new_public_key or new_public_key_file:
            vault_type = u'asymmetric'

        # if vault type is specified, retrieve existing secret
        if vault_type:
            opts = options.copy()
            opts.pop('description', None)

            opts['password'] = old_password
            opts['password_file'] = old_password_file
            opts['private_key'] = old_private_key
            opts['private_key_file'] = old_private_key_file

            response = self.api.Command.vault_retrieve(*args, **opts)
            data = response['result']['data']

        opts = options.copy()

        # if vault type is specified, update crypto attributes
        if vault_type:
            opts['ipavaulttype'] = vault_type

            if vault_type == u'standard':
                opts['ipavaultsalt'] = None
                opts['ipavaultpublickey'] = None

            elif vault_type == u'symmetric':
                if salt:
                    opts['ipavaultsalt'] = salt
                else:
                    opts['ipavaultsalt'] = os.urandom(16)

                opts['ipavaultpublickey'] = None

            elif vault_type == u'asymmetric':

                # get new vault public key
                if new_public_key and new_public_key_file:
                    raise errors.MutuallyExclusiveError(
                        reason=_('New public key specified multiple times'))

                elif new_public_key:
                    pass

                elif new_public_key_file:
                    new_public_key = validated_read('public_key_file',
                                                    new_public_key_file,
                                                    mode='rb')

                else:
                    raise errors.ValidationError(
                        name='ipavaultpublickey',
                        error=_('Missing new vault public key'))

                opts['ipavaultsalt'] = None
                opts['ipavaultpublickey'] = new_public_key

        response = self.api.Command.vault_mod_internal(*args, **opts)

        # if vault type is specified, rearchive existing secret
        if vault_type:
            opts = options.copy()
            opts.pop('description', None)

            opts['data'] = data
            opts['password'] = new_password
            opts['password_file'] = new_password_file
            opts['override_password'] = True

            self.api.Command.vault_archive(*args, **opts)

        return response


@register()
class vault_mod_internal(LDAPUpdate):

    NO_CLI = True

    takes_options = LDAPUpdate.takes_options + vault_options

    msg_summary = _('Modified vault "%(value)s"')

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list,
                     *keys, **options):

        assert isinstance(dn, DN)

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        return dn

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        self.obj.get_container_attribute(entry_attrs, options)
        return dn


@register()
class vault_show(LDAPRetrieve):
    __doc__ = _('Display information about a vault.')

    takes_options = LDAPRetrieve.takes_options + vault_options

    has_output_params = LDAPRetrieve.has_output_params

    def pre_callback(self, ldap, dn, attrs_list, *keys, **options):
        assert isinstance(dn, DN)

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        return dn

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        self.obj.get_container_attribute(entry_attrs, options)
        return dn


@register()
class vaultconfig(Object):
    __doc__ = _('Vault configuration')

    takes_params = (
        Bytes(
            'transport_cert',
            label=_('Transport Certificate'),
        ),
    )


@register()
class vaultconfig_show(Retrieve):
    __doc__ = _('Show vault configuration.')

    takes_options = (
        Str(
            'transport_out?',
            doc=_('Output file to store the transport certificate'),
        ),
    )

    def forward(self, *args, **options):

        file = options.get('transport_out')

        # don't send these parameters to server
        if 'transport_out' in options:
            del options['transport_out']

        response = super(vaultconfig_show, self).forward(*args, **options)

        if file:
            with open(file, 'w') as f:
                f.write(response['result']['transport_cert'])

        return response

    def execute(self, *args, **options):

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        kra_client = self.api.Backend.kra.get_client()
        transport_cert = kra_client.system_certs.get_transport_cert()
        return {
            'result': {
                'transport_cert': transport_cert.binary
            },
            'value': None,
        }


@register()
class vault_archive(PKQuery, Local):
    __doc__ = _('Archive data into a vault.')

    takes_options = vault_options + (
        Bytes(
            'data?',
            doc=_('Binary data to archive'),
        ),
        Str(  # TODO: use File parameter
            'in?',
            doc=_('File containing data to archive'),
        ),
        Str(
            'password?',
            cli_name='password',
            doc=_('Vault password'),
        ),
        Str(  # TODO: use File parameter
            'password_file?',
            cli_name='password_file',
            doc=_('File containing the vault password'),
        ),
        Flag(
            'override_password?',
            doc=_('Override existing password'),
        ),
    )

    has_output = output.standard_entry

    def forward(self, *args, **options):

        name = args[-1]

        data = options.get('data')
        input_file = options.get('in')

        password = options.get('password')
        password_file = options.get('password_file')

        override_password = options.pop('override_password', False)

        # don't send these parameters to server
        if 'data' in options:
            del options['data']
        if 'in' in options:
            del options['in']
        if 'password' in options:
            del options['password']
        if 'password_file' in options:
            del options['password_file']

        # get data
        if data and input_file:
            raise errors.MutuallyExclusiveError(
                reason=_('Input data specified multiple times'))

        elif data:
            if len(data) > MAX_VAULT_DATA_SIZE:
                raise errors.ValidationError(name="data", error=_(
                    "Size of data exceeds the limit. Current vault data size "
                    "limit is %(limit)d B")
                    % {'limit': MAX_VAULT_DATA_SIZE})

        elif input_file:
            try:
                stat = os.stat(input_file)
            except OSError as exc:
                raise errors.ValidationError(name="in", error=_(
                    "Cannot read file '%(filename)s': %(exc)s")
                    % {'filename': input_file, 'exc': exc[1]})
            if stat.st_size > MAX_VAULT_DATA_SIZE:
                raise errors.ValidationError(name="in", error=_(
                    "Size of data exceeds the limit. Current vault data size "
                    "limit is %(limit)d B")
                    % {'limit': MAX_VAULT_DATA_SIZE})
            data = validated_read('in', input_file, mode='rb')

        else:
            data = ''

        if self.api.env.in_server:
            backend = self.api.Backend.ldap2
        else:
            backend = self.api.Backend.rpcclient
        if not backend.isconnected():
            backend.connect()

        # retrieve vault info
        vault = self.api.Command.vault_show(*args, **options)['result']

        vault_type = vault['ipavaulttype'][0]

        if vault_type == u'standard':

            encrypted_key = None

        elif vault_type == u'symmetric':

            # get password
            if password and password_file:
                raise errors.MutuallyExclusiveError(
                    reason=_('Password specified multiple times'))

            elif password:
                pass

            elif password_file:
                password = validated_read('password-file',
                                          password_file,
                                          encoding='utf-8')
                password = password.rstrip('\n')

            else:
                if override_password:
                    password = self.obj.get_new_password()
                else:
                    password = self.obj.get_existing_password()

            if not override_password:
                # verify password by retrieving existing data
                opts = options.copy()
                opts['password'] = password
                try:
                    self.api.Command.vault_retrieve(*args, **opts)
                except errors.NotFound:
                    pass

            salt = vault['ipavaultsalt'][0]

            # generate encryption key from vault password
            encryption_key = self.obj.generate_symmetric_key(
                password, salt)

            # encrypt data with encryption key
            data = self.obj.encrypt(data, symmetric_key=encryption_key)

            encrypted_key = None

        elif vault_type == u'asymmetric':

            public_key = vault['ipavaultpublickey'][0].encode('utf-8')

            # generate encryption key
            encryption_key = base64.b64encode(os.urandom(32))

            # encrypt data with encryption key
            data = self.obj.encrypt(data, symmetric_key=encryption_key)

            # encrypt encryption key with public key
            encrypted_key = self.obj.encrypt(
                encryption_key, public_key=public_key)

        else:
            raise errors.ValidationError(
                name='vault_type',
                error=_('Invalid vault type'))

        # initialize NSS database
        current_dbdir = paths.IPA_NSSDB_DIR
        nss.nss_init(current_dbdir)

        # retrieve transport certificate
        config = self.api.Command.vaultconfig_show()['result']
        transport_cert_der = config['transport_cert']
        nss_transport_cert = nss.Certificate(transport_cert_der)

        # generate session key
        mechanism = nss.CKM_DES3_CBC_PAD
        slot = nss.get_best_slot(mechanism)
        key_length = slot.get_best_key_length(mechanism)
        session_key = slot.key_gen(mechanism, None, key_length)

        # wrap session key with transport certificate
        public_key = nss_transport_cert.subject_public_key_info.public_key
        wrapped_session_key = nss.pub_wrap_sym_key(mechanism,
                                                   public_key,
                                                   session_key)

        options['session_key'] = wrapped_session_key.data

        nonce_length = nss.get_iv_length(mechanism)
        nonce = nss.generate_random(nonce_length)
        options['nonce'] = nonce

        vault_data = {}
        vault_data[u'data'] = base64.b64encode(data).decode('utf-8')

        if encrypted_key:
            vault_data[u'encrypted_key'] = base64.b64encode(encrypted_key)\
                .decode('utf-8')

        json_vault_data = json.dumps(vault_data)

        # wrap vault_data with session key
        iv_si = nss.SecItem(nonce)
        iv_param = nss.param_from_iv(mechanism, iv_si)

        encoding_ctx = nss.create_context_by_sym_key(mechanism,
                                                     nss.CKA_ENCRYPT,
                                                     session_key,
                                                     iv_param)

        wrapped_vault_data = encoding_ctx.cipher_op(json_vault_data)\
            + encoding_ctx.digest_final()

        options['vault_data'] = wrapped_vault_data

        return self.api.Command.vault_archive_internal(*args, **options)


@register()
class vault_archive_internal(PKQuery):

    NO_CLI = True

    takes_options = vault_options + (
        Bytes(
            'session_key',
            doc=_('Session key wrapped with transport certificate'),
        ),
        Bytes(
            'vault_data',
            doc=_('Vault data encrypted with session key'),
        ),
        Bytes(
            'nonce',
            doc=_('Nonce'),
        ),
    )

    has_output = output.standard_entry

    msg_summary = _('Archived data into vault "%(value)s"')

    def execute(self, *args, **options):

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        wrapped_vault_data = options.pop('vault_data')
        nonce = options.pop('nonce')
        wrapped_session_key = options.pop('session_key')

        # retrieve vault info
        vault = self.api.Command.vault_show(*args, **options)['result']

        # connect to KRA
        kra_client = self.api.Backend.kra.get_client()

        kra_account = pki.account.AccountClient(kra_client.connection)
        kra_account.login()

        client_key_id = self.obj.get_key_id(vault['dn'])

        # deactivate existing vault record in KRA
        response = kra_client.keys.list_keys(
            client_key_id,
            pki.key.KeyClient.KEY_STATUS_ACTIVE)

        for key_info in response.key_infos:
            kra_client.keys.modify_key_status(
                key_info.get_key_id(),
                pki.key.KeyClient.KEY_STATUS_INACTIVE)

        # forward wrapped data to KRA
        kra_client.keys.archive_encrypted_data(
            client_key_id,
            pki.key.KeyClient.PASS_PHRASE_TYPE,
            wrapped_vault_data,
            wrapped_session_key,
            None,
            nonce,
        )

        kra_account.logout()

        response = {
            'value': args[-1],
            'result': {},
        }

        response['summary'] = self.msg_summary % response

        return response


@register()
class vault_retrieve(PKQuery, Local):
    __doc__ = _('Retrieve a data from a vault.')

    takes_options = vault_options + (
        Str(
            'out?',
            doc=_('File to store retrieved data'),
        ),
        Str(
            'password?',
            cli_name='password',
            doc=_('Vault password'),
        ),
        Str(  # TODO: use File parameter
            'password_file?',
            cli_name='password_file',
            doc=_('File containing the vault password'),
        ),
        Bytes(
            'private_key?',
            cli_name='private_key',
            doc=_('Vault private key'),
        ),
        Str(  # TODO: use File parameter
            'private_key_file?',
            cli_name='private_key_file',
            doc=_('File containing the vault private key'),
        ),
    )

    has_output = output.standard_entry
    has_output_params = (
        Bytes(
            'data',
            label=_('Data'),
        ),
    )

    def forward(self, *args, **options):

        name = args[-1]

        output_file = options.get('out')

        password = options.get('password')
        password_file = options.get('password_file')
        private_key = options.get('private_key')
        private_key_file = options.get('private_key_file')

        # don't send these parameters to server
        if 'out' in options:
            del options['out']
        if 'password' in options:
            del options['password']
        if 'password_file' in options:
            del options['password_file']
        if 'private_key' in options:
            del options['private_key']
        if 'private_key_file' in options:
            del options['private_key_file']

        if self.api.env.in_server:
            backend = self.api.Backend.ldap2
        else:
            backend = self.api.Backend.rpcclient
        if not backend.isconnected():
            backend.connect()

        # retrieve vault info
        vault = self.api.Command.vault_show(*args, **options)['result']

        vault_type = vault['ipavaulttype'][0]

        # initialize NSS database
        current_dbdir = paths.IPA_NSSDB_DIR
        nss.nss_init(current_dbdir)

        # retrieve transport certificate
        config = self.api.Command.vaultconfig_show()['result']
        transport_cert_der = config['transport_cert']
        nss_transport_cert = nss.Certificate(transport_cert_der)

        # generate session key
        mechanism = nss.CKM_DES3_CBC_PAD
        slot = nss.get_best_slot(mechanism)
        key_length = slot.get_best_key_length(mechanism)
        session_key = slot.key_gen(mechanism, None, key_length)

        # wrap session key with transport certificate
        public_key = nss_transport_cert.subject_public_key_info.public_key
        wrapped_session_key = nss.pub_wrap_sym_key(mechanism,
                                                   public_key,
                                                   session_key)

        # send retrieval request to server
        options['session_key'] = wrapped_session_key.data

        response = self.api.Command.vault_retrieve_internal(*args, **options)

        result = response['result']
        nonce = result['nonce']

        # unwrap data with session key
        wrapped_vault_data = result['vault_data']

        iv_si = nss.SecItem(nonce)
        iv_param = nss.param_from_iv(mechanism, iv_si)

        decoding_ctx = nss.create_context_by_sym_key(mechanism,
                                                     nss.CKA_DECRYPT,
                                                     session_key,
                                                     iv_param)

        json_vault_data = decoding_ctx.cipher_op(wrapped_vault_data)\
            + decoding_ctx.digest_final()

        vault_data = json.loads(json_vault_data)
        data = base64.b64decode(vault_data[u'data'].encode('utf-8'))

        encrypted_key = None

        if 'encrypted_key' in vault_data:
            encrypted_key = base64.b64decode(vault_data[u'encrypted_key']
                                             .encode('utf-8'))

        if vault_type == u'standard':

            pass

        elif vault_type == u'symmetric':

            salt = vault['ipavaultsalt'][0]

            # get encryption key from vault password
            if password and password_file:
                raise errors.MutuallyExclusiveError(
                    reason=_('Password specified multiple times'))

            elif password:
                pass

            elif password_file:
                password = validated_read('password-file',
                                          password_file,
                                          encoding='utf-8')
                password = password.rstrip('\n')

            else:
                password = self.obj.get_existing_password()

            # generate encryption key from password
            encryption_key = self.obj.generate_symmetric_key(password, salt)

            # decrypt data with encryption key
            data = self.obj.decrypt(data, symmetric_key=encryption_key)

        elif vault_type == u'asymmetric':

            # get encryption key with vault private key
            if private_key and private_key_file:
                raise errors.MutuallyExclusiveError(
                    reason=_('Private key specified multiple times'))

            elif private_key:
                pass

            elif private_key_file:
                private_key = validated_read('private-key-file',
                                             private_key_file,
                                             mode='rb')

            else:
                raise errors.ValidationError(
                    name='private_key',
                    error=_('Missing vault private key'))

            # decrypt encryption key with private key
            encryption_key = self.obj.decrypt(
                encrypted_key, private_key=private_key)

            # decrypt data with encryption key
            data = self.obj.decrypt(data, symmetric_key=encryption_key)

        else:
            raise errors.ValidationError(
                name='vault_type',
                error=_('Invalid vault type'))

        if output_file:
            with open(output_file, 'w') as f:
                f.write(data)

        else:
            response['result'] = {'data': data}

        return response


@register()
class vault_retrieve_internal(PKQuery):

    NO_CLI = True

    takes_options = vault_options + (
        Bytes(
            'session_key',
            doc=_('Session key wrapped with transport certificate'),
        ),
    )

    has_output = output.standard_entry

    msg_summary = _('Retrieved data from vault "%(value)s"')

    def execute(self, *args, **options):

        if not self.api.Command.kra_is_enabled()['result']:
            raise errors.InvocationError(
                format=_('KRA service is not enabled'))

        wrapped_session_key = options.pop('session_key')

        # retrieve vault info
        vault = self.api.Command.vault_show(*args, **options)['result']

        # connect to KRA
        kra_client = self.api.Backend.kra.get_client()

        kra_account = pki.account.AccountClient(kra_client.connection)
        kra_account.login()

        client_key_id = self.obj.get_key_id(vault['dn'])

        # find vault record in KRA
        response = kra_client.keys.list_keys(
            client_key_id,
            pki.key.KeyClient.KEY_STATUS_ACTIVE)

        if not len(response.key_infos):
            raise errors.NotFound(reason=_('No archived data.'))

        key_info = response.key_infos[0]

        # retrieve encrypted data from KRA
        key = kra_client.keys.retrieve_key(
            key_info.get_key_id(),
            wrapped_session_key)

        kra_account.logout()

        response = {
            'value': args[-1],
            'result': {
                'vault_data': key.encrypted_data,
                'nonce': key.nonce_data,
            },
        }

        response['summary'] = self.msg_summary % response

        return response


@register()
class vault_add_owner(VaultModMember, LDAPAddMember):
    __doc__ = _('Add owners to a vault.')

    takes_options = LDAPAddMember.takes_options + vault_options

    member_attributes = ['owner']
    member_param_label = _('owner %s')
    member_count_out = ('%i owner added.', '%i owners added.')

    has_output = (
        output.Entry('result'),
        output.Output(
            'failed',
            type=dict,
            doc=_('Owners that could not be added'),
        ),
        output.Output(
            'completed',
            type=int,
            doc=_('Number of owners added'),
        ),
    )


@register()
class vault_remove_owner(VaultModMember, LDAPRemoveMember):
    __doc__ = _('Remove owners from a vault.')

    takes_options = LDAPRemoveMember.takes_options + vault_options

    member_attributes = ['owner']
    member_param_label = _('owner %s')
    member_count_out = ('%i owner removed.', '%i owners removed.')

    has_output = (
        output.Entry('result'),
        output.Output(
            'failed',
            type=dict,
            doc=_('Owners that could not be removed'),
        ),
        output.Output(
            'completed',
            type=int,
            doc=_('Number of owners removed'),
        ),
    )


@register()
class vault_add_member(VaultModMember, LDAPAddMember):
    __doc__ = _('Add members to a vault.')

    takes_options = LDAPAddMember.takes_options + vault_options


@register()
class vault_remove_member(VaultModMember, LDAPRemoveMember):
    __doc__ = _('Remove members from a vault.')

    takes_options = LDAPRemoveMember.takes_options + vault_options


@register()
class kra_is_enabled(Command):
    NO_CLI = True

    has_output = output.standard_value

    def execute(self, *args, **options):
        base_dn = DN(('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'),
                     self.api.env.basedn)
        filter = '(&(objectClass=ipaConfigObject)(cn=KRA))'
        try:
            self.api.Backend.ldap2.find_entries(
                base_dn=base_dn, filter=filter, attrs_list=[])
        except errors.NotFound:
            result = False
        else:
            result = True
        return dict(result=result, value=pkey_to_value(None, options))