diff options
Diffstat (limited to 'python/vyos/remote.py')
| -rw-r--r-- | python/vyos/remote.py | 208 |
1 files changed, 96 insertions, 112 deletions
diff --git a/python/vyos/remote.py b/python/vyos/remote.py index 3f46d979b..ad9706a82 100644 --- a/python/vyos/remote.py +++ b/python/vyos/remote.py @@ -1,4 +1,4 @@ -# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io> +# Copyright 2021 VyOS maintainers and contributors <maintainers@vyos.io> # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public @@ -13,131 +13,115 @@ # You should have received a copy of the GNU Lesser General Public # License along with this library. If not, see <http://www.gnu.org/licenses/>. -import sys import os -import re -import fileinput +import sys +import tempfile +from ftplib import FTP +import urllib.parse +import urllib.request from vyos.util import cmd -from vyos.util import DEVNULL - - -def check_and_add_host_key(host_name): +from paramiko import SSHClient + +def upload_ftp(local_path, hostname, remote_path,\ + username='anonymous', password='', port=21): + with open(local_path, 'rb') as file: + with FTP() as conn: + conn.connect(hostname, port) + conn.login(username, password) + conn.storbinary(f'STOR {remote_path}', file) + +def download_ftp(local_path, hostname, remote_path,\ + username='anonymous', password='', port=21): + with open(local_path, 'wb') as file: + with FTP() as conn: + conn.connect(hostname, port) + conn.login(username, password) + conn.retrbinary(f'RETR {remote_path}', file.write) + +def upload_sftp(local_path, hostname, remote_path,\ + username=None, password=None, port=22): + with SSHClient() as ssh: + ssh.load_system_host_keys() + ssh.connect(hostname, port, username, password) + with ssh.open_sftp() as sftp: + sftp.put(local_path, remote_path) + +def download_sftp(local_path, hostname, remote_path,\ + username=None, password=None, port=22): + with SSHClient() as ssh: + ssh.load_system_host_keys() + ssh.connect(hostname, port, username, password) + with ssh.open_sftp() as sftp: + sftp.get(remote_path, local_path) + +def upload_tftp(local_path, hostname, remote_path, port=69): + with open(local_path, 'rb') as file: + cmd(f'curl -s -T - tftp://{hostname}:{port}/{remote_path}', stderr=None, input=file.read()) + +def download_tftp(local_path, hostname, remote_path, port=69): + with open(local_path, 'wb') as file: + file.write(cmd(f'curl -s tftp://{hostname}:{port}/{remote_path}', stderr=None)) + +def download_http(urlstring, local_path): + with open(local_path, 'wb') as file: + with urllib.request.urlopen(urlstring) as response: + file.write(response.read()) + +def download(local_path, urlstring): """ - Filter host keys and prompt for adding key to known_hosts file, if - needed. + Dispatch the appropriate download function for the given URL and save to local path. """ - known_hosts = '{}/.ssh/known_hosts'.format(os.getenv('HOME')) - if not os.path.exists(known_hosts): - mode = 0o600 - os.mknod(known_hosts, 0o600) - - keyscan_cmd = 'ssh-keyscan -t rsa {}'.format(host_name) - - try: - host_key = cmd(keyscan_cmd, stderr=DEVNULL) - except OSError: - sys.exit("Can not get RSA host key") - - # libssh2 (jessie; stretch) does not recognize ec host keys, and curl - # will fail with error 51 if present in known_hosts file; limit to rsa. - usable_keys = False - offending_keys = [] - for line in fileinput.input(known_hosts, inplace=True): - if host_name in line and 'ssh-rsa' in line: - if line.split()[-1] != host_key.split()[-1]: - offending_keys.append(line) - continue - else: - usable_keys = True - if host_name in line and not 'ssh-rsa' in line: - continue - - sys.stdout.write(line) - - if usable_keys: - return - - if offending_keys: - print("Host key has changed!") - print("If you trust the host key fingerprint below, continue.") - - fingerprint_cmd = 'ssh-keygen -lf /dev/stdin' - try: - fingerprint = cmd(fingerprint_cmd, stderr=DEVNULL, input=host_key) - except OSError: - sys.exit("Can not get RSA host key fingerprint.") - - print("RSA host key fingerprint is {}".format(fingerprint.split()[1])) - response = input("Do you trust this host? [y]/n ") - - if not response or response == 'y': - with open(known_hosts, 'a+') as f: - print("Adding {} to the list of known" - " hosts.".format(host_name)) - f.write(host_key) + url = urllib.parse.urlparse(urlstring) + if url.scheme == 'http' or url.scheme == 'https': + download_http(urlstring, local_path) + elif url.scheme == 'ftp': + username = url.username if url.username else 'anonymous' + download_ftp(local_path, url.hostname, url.path, username, url.password) + elif url.scheme == 'sftp' or url.scheme == 'scp': + # None means we don't want to use password authentication. + # An empty string (what urlparse returns when a password doesn't + # exist in the URL) means the password is an empty string. + password = url.password if url.password else None + download_sftp(local_path, url.hostname, url.path, url.username, password) + elif url.scheme == 'tftp': + download_tftp(local_path, url.hostname, url.path) else: - sys.exit("Host not trusted") + ValueError(f'Unsupported URL scheme: {url.scheme}') -def get_remote_config(remote_file): - """ Invoke curl to download remote (config) file. +def upload(local_path, urlstring): + """ + Dispatch the appropriate upload function for the given URL and upload from local path. + """ + url = urllib.parse.urlparse(urlstring) + if url.scheme == 'ftp': + username = url.username if url.username else 'anonymous' + upload_ftp(local_path, url.hostname, url.path, username, url.password) + elif url.scheme == 'sftp' or url.scheme == 'scp': + password = url.password if url.password else None + upload_sftp(local_path, url.hostname, url.path, url.username, password) + elif url.scheme == 'tftp': + upload_tftp(local_path, url.hostname, url.path) + else: + ValueError(f'Unsupported URL scheme: {url.scheme}') +def get_remote_config(urlstring): + """ + Download remote (config) file and return the contents. Args: remote file URI: scp://<user>[:<passwd>]@<host>/<file> sftp://<user>[:<passwd>]@<host>/<file> http://<host>/<file> https://<host>/<file> - ftp://<user>[:<passwd>]@<host>/<file> + ftp://[<user>[:<passwd>]@]<host>/<file> tftp://<host>/<file> """ - request = dict.fromkeys(['protocol', 'user', 'host', 'file']) - protocols = ['scp', 'sftp', 'http', 'https', 'ftp', 'tftp'] - or_protocols = '|'.join(protocols) - - request_match = re.match(r'(' + or_protocols + r')://(.*?)(/.*)', - remote_file) - if request_match: - (request['protocol'], request['host'], - request['file']) = request_match.groups() - else: - print("Malformed URI") - sys.exit(1) - - user_match = re.search(r'(.*)@(.*)', request['host']) - if user_match: - request['user'] = user_match.groups()[0] - request['host'] = user_match.groups()[1] - - remote_file = '{0}://{1}{2}'.format(request['protocol'], request['host'], request['file']) - - if request['protocol'] in ('scp', 'sftp'): - check_and_add_host_key(request['host']) - - redirect_opt = '' - - if request['protocol'] in ('http', 'https'): - redirect_opt = '-L' - # Try header first, and look for 'OK' or 'Moved' codes: - curl_cmd = 'curl {0} -q -I {1}'.format(redirect_opt, remote_file) - try: - curl_output = cmd(curl_cmd) - except OSError: - sys.exit(1) - - return_vals = re.findall(r'^HTTP\/\d+\.?\d\s+(\d+)\s+(.*)$', - curl_output, re.MULTILINE) - for val in return_vals: - if int(val[0]) not in [200, 301, 302]: - print('HTTP error: {0} {1}'.format(*val)) - sys.exit(1) - - if request['user']: - curl_cmd = 'curl -# -u {0} {1}'.format(request['user'], remote_file) - else: - curl_cmd = 'curl {0} -# {1}'.format(redirect_opt, remote_file) - + url = urllib.parse.urlparse(urlstring) + temp = tempfile.NamedTemporaryFile(delete=False).name try: - return cmd(curl_cmd, stderr=None) - except OSError: - return None + download(temp, urlstring) + with open(temp, 'r') as file: + return file.read() + finally: + os.remove(temp) |