mirror of
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329 lines
12 KiB
Python
329 lines
12 KiB
Python
# (c) 2016 Red Hat Inc.
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# (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = """
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---
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author: Ansible Networking Team
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connection: netconf
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short_description: Provides a persistent connection using the netconf protocol
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description:
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- This connection plugin provides a connection to remote devices over the
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SSH NETCONF subsystem. This connection plugin is typically used by
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network devices for sending and receiving RPC calls over NETCONF.
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- Note this connection plugin requires ncclient to be installed on the
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local Ansible controller.
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version_added: "2.3"
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requirements:
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- ncclient
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options:
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host:
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description:
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- Specifies the remote device FQDN or IP address to establish the SSH
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connection to.
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default: inventory_hostname
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vars:
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- name: ansible_host
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port:
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type: int
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description:
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- Specifies the port on the remote device to listening for connections
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when establishing the SSH connection.
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default: 830
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ini:
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- section: defaults
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key: remote_port
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env:
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- name: ANSIBLE_REMOTE_PORT
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vars:
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- name: ansible_port
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network_os:
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description:
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- Configures the device platform network operating system. This value is
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used to load a device specific netconf plugin. If this option is not
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configured, then the default netconf plugin will be used.
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vars:
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- name: ansible_network_os
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remote_user:
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description:
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- The username used to authenticate to the remote device when the SSH
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connection is first established. If the remote_user is not specified,
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the connection will use the username of the logged in user.
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- Can be configured form the CLI via the C(--user) or C(-u) options
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ini:
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- section: defaults
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key: remote_user
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env:
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- name: ANSIBLE_REMOTE_USER
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vars:
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- name: ansible_user
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password:
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description:
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- Configures the user password used to authenticate to the remote device
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when first establishing the SSH connection.
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vars:
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- name: ansible_password
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- name: ansible_ssh_pass
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private_key_file:
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description:
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- The private SSH key or certificate file used to to authenticate to the
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remote device when first establishing the SSH connection.
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ini:
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- section: defaults
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key: private_key_file
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env:
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- name: ANSIBLE_PRIVATE_KEY_FILE
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vars:
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- name: ansible_private_key_file
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timeout:
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type: int
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description:
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- Sets the connection time for the communicating with the remote device.
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This timeout is used as the default timeout value when awaiting a
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response after issuing a call to a RPC. If the RPC does not return in
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timeout seconds, an error is generated.
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default: 120
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host_key_auto_add:
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type: bool
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description:
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- By default, Ansible will prompt the user before adding SSH keys to the
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known hosts file. Enabling this option, unknown host keys will
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automatically be added to the known hosts file.
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- Be sure to fully understand the security implications of enabling this
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option on production systems as it could create a security vulnerability.
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default: 'no'
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ini:
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- section: paramiko_connection
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key: host_key_auto_add
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env:
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- name: ANSIBLE_HOST_KEY_AUTO_ADD
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look_for_keys:
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default: True
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description:
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- enables looking for ssh keys in the usual locations for ssh keys (e.g. :file:`~/.ssh/id_*`)
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env:
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- name: ANSIBLE_PARAMIKO_LOOK_FOR_KEYS
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ini:
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- section: paramiko_connection
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key: look_for_keys
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type: boolean
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host_key_checking:
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description: 'Set this to "False" if you want to avoid host key checking by the underlying tools Ansible uses to connect to the host'
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type: boolean
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default: True
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env:
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- name: ANSIBLE_HOST_KEY_CHECKING
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- name: ANSIBLE_SSH_HOST_KEY_CHECKING
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- name: ANSIBLE_NETCONF_HOST_KEY_CHECKING
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ini:
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- section: defaults
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key: host_key_checking
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- section: paramiko_connection
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key: host_key_checking
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vars:
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- name: ansible_host_key_checking
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- name: ansible_ssh_host_key_checking
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- name: ansible_netconf_host_key_checking
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persistent_connect_timeout:
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type: int
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description:
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- Configures, in seconds, the amount of time to wait when trying to
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initially establish a persistent connection. If this value expires
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before the connection to the remote device is completed, the connection
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will fail
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default: 30
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ini:
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- section: persistent_connection
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key: connect_timeout
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env:
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- name: ANSIBLE_PERSISTENT_CONNECT_TIMEOUT
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vars:
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- name: ansible_connect_timeout
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persistent_command_timeout:
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type: int
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description:
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- Configures, in seconds, the amount of time to wait for a command to
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return from the remote device. If this timer is exceeded before the
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command returns, the connection plugin will raise an exception and
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close
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default: 10
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ini:
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- section: persistent_connection
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key: command_timeout
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env:
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- name: ANSIBLE_PERSISTENT_COMMAND_TIMEOUT
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vars:
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- name: ansible_command_timeout
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netconf_ssh_config:
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description:
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- This variable is used to enable bastion/jump host with netconf connection. If set to
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True the bastion/jump host ssh settings should be present in ~/.ssh/config file,
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alternatively it can be set to custom ssh configuration file path to read the
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bastion/jump host settings.
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ini:
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- section: netconf_connection
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key: ssh_config
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version_added: '2.7'
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env:
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- name: ANSIBLE_NETCONF_SSH_CONFIG
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vars:
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- name: ansible_netconf_ssh_config
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version_added: '2.7'
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"""
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import os
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import logging
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import json
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from ansible.errors import AnsibleConnectionFailure, AnsibleError
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from ansible.module_utils._text import to_bytes, to_native, to_text
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from ansible.module_utils.parsing.convert_bool import BOOLEANS_TRUE, BOOLEANS_FALSE
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from ansible.plugins.loader import netconf_loader
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from ansible.plugins.connection import NetworkConnectionBase
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try:
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from ncclient import manager
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from ncclient.operations import RPCError
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from ncclient.transport.errors import SSHUnknownHostError
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from ncclient.xml_ import to_ele, to_xml
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HAS_NCCLIENT = True
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except ImportError:
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HAS_NCCLIENT = False
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try:
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from __main__ import display
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except ImportError:
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from ansible.utils.display import Display
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display = Display()
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logging.getLogger('ncclient').setLevel(logging.INFO)
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NETWORK_OS_DEVICE_PARAM_MAP = {
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"nxos": "nexus",
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"ios": "default",
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"sros": "alu",
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"ce": "huawei"
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}
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class Connection(NetworkConnectionBase):
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"""NetConf connections"""
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transport = 'netconf'
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has_pipelining = False
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def __init__(self, play_context, new_stdin, *args, **kwargs):
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super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
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self._network_os = self._network_os or 'default'
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display.display('network_os is set to %s' % self._network_os, log_only=True)
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self._manager = None
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self.key_filename = None
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def exec_command(self, cmd, in_data=None, sudoable=True):
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"""Sends the request to the node and returns the reply
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The method accepts two forms of request. The first form is as a byte
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string that represents xml string be send over netconf session.
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The second form is a json-rpc (2.0) byte string.
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"""
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if self._manager:
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# to_ele operates on native strings
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request = to_ele(to_native(cmd, errors='surrogate_or_strict'))
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if request is None:
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return 'unable to parse request'
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try:
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reply = self._manager.rpc(request)
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except RPCError as exc:
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error = self.internal_error(data=to_text(to_xml(exc.xml), errors='surrogate_or_strict'))
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return json.dumps(error)
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return reply.data_xml
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else:
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return super(Connection, self).exec_command(cmd, in_data, sudoable)
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def _connect(self):
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if not HAS_NCCLIENT:
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raise AnsibleError(
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'ncclient is required to use the netconf connection type.\n'
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'Please run pip install ncclient'
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)
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super(Connection, self)._connect()
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display.display('ssh connection done, starting ncclient', log_only=True)
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allow_agent = True
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if self._play_context.password is not None:
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allow_agent = False
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setattr(self._play_context, 'allow_agent', allow_agent)
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self.key_filename = self._play_context.private_key_file or self.get_option('private_key_file')
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if self.key_filename:
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self.key_filename = str(os.path.expanduser(self.key_filename))
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if self._network_os == 'default':
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for cls in netconf_loader.all(class_only=True):
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network_os = cls.guess_network_os(self)
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if network_os:
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display.display('discovered network_os %s' % network_os, log_only=True)
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self._network_os = network_os
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device_params = {'name': NETWORK_OS_DEVICE_PARAM_MAP.get(self._network_os) or self._network_os}
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ssh_config = self.get_option('netconf_ssh_config')
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if ssh_config in BOOLEANS_TRUE:
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ssh_config = True
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elif ssh_config in BOOLEANS_FALSE:
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ssh_config = None
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try:
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port = self._play_context.port or 830
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display.vvvv("ESTABLISH NETCONF SSH CONNECTION FOR USER: %s on PORT %s TO %s" %
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(self._play_context.remote_user, port, self._play_context.remote_addr))
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self._manager = manager.connect(
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host=self._play_context.remote_addr,
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port=port,
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username=self._play_context.remote_user,
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password=self._play_context.password,
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key_filename=self.key_filename,
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hostkey_verify=self.get_option('host_key_checking'),
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look_for_keys=self.get_option('look_for_keys'),
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device_params=device_params,
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allow_agent=self._play_context.allow_agent,
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timeout=self._play_context.timeout,
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ssh_config=ssh_config
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)
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except SSHUnknownHostError as exc:
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raise AnsibleConnectionFailure(str(exc))
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except ImportError as exc:
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raise AnsibleError("connection=netconf is not supported on {0}".format(self._network_os))
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if not self._manager.connected:
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return 1, b'', b'not connected'
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display.display('ncclient manager object created successfully', log_only=True)
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self._connected = True
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netconf = netconf_loader.get(self._network_os, self)
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if netconf:
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display.display('loaded netconf plugin for network_os %s' % self._network_os, log_only=True)
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else:
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netconf = netconf_loader.get("default", self)
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display.display('unable to load netconf plugin for network_os %s, falling back to default plugin' % self._network_os)
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self._implementation_plugins.append(netconf)
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super(Connection, self)._connect()
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return 0, to_bytes(self._manager.session_id, errors='surrogate_or_strict'), b''
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def close(self):
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if self._manager:
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self._manager.close_session()
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super(Connection, self).close()
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