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# This code is part of Ansible, but is an independent component.
# This particular file snippet, and this file snippet only, is BSD licensed.
# Modules you write using this snippet, which is embedded dynamically by Ansible
# still belong to the author of the module, and may assign their own license
# to the complete work.
#
# Copyright (c), Michael DeHaan <michael.dehaan@gmail.com>, 2012-2013
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import os
import hmac
import re
try:
import urlparse
except ImportError:
import urllib.parse as urlparse
try:
from hashlib import sha1
except ImportError:
import sha as sha1
HASHED_KEY_MAGIC = "|1|"
def add_git_host_key(module, url, accept_hostkey=True, create_dir=True):
""" idempotently add a git url hostkey """
if is_ssh_url(url):
fqdn, port = get_fqdn_and_port(url)
if fqdn:
known_host = check_hostkey(module, fqdn)
if not known_host:
if accept_hostkey:
rc, out, err = add_host_key(module, fqdn, port=port, create_dir=create_dir)
if rc != 0:
module.fail_json(msg="failed to add %s hostkey: %s" % (fqdn, out + err))
else:
module.fail_json(msg="%s has an unknown hostkey. Set accept_hostkey to True "
"or manually add the hostkey prior to running the git module" % fqdn)
def is_ssh_url(url):
""" check if url is ssh """
if "@" in url and "://" not in url:
return True
for scheme in "ssh://", "git+ssh://", "ssh+git://":
if url.startswith(scheme):
return True
return False
def get_fqdn_and_port(repo_url):
""" chop the hostname and port out of a url """
fqdn = None
port = None
ipv6_re = re.compile('(\[[^]]*\])(?::([0-9]+))?')
if "@" in repo_url and "://" not in repo_url:
# most likely an user@host:path or user@host/path type URL
repo_url = repo_url.split("@", 1)[1]
match = ipv6_re.match(repo_url)
# For this type of URL, colon specifies the path, not the port
if match:
fqdn, path = match.groups()
elif ":" in repo_url:
fqdn = repo_url.split(":")[0]
elif "/" in repo_url:
fqdn = repo_url.split("/")[0]
elif "://" in repo_url:
# this should be something we can parse with urlparse
parts = urlparse.urlparse(repo_url)
# parts[1] will be empty on python2.4 on ssh:// or git:// urls, so
# ensure we actually have a parts[1] before continuing.
if parts[1] != '':
fqdn = parts[1]
if "@" in fqdn:
fqdn = fqdn.split("@", 1)[1]
match = ipv6_re.match(fqdn)
if match:
fqdn, port = match.groups()
elif ":" in fqdn:
fqdn, port = fqdn.split(":")[0:2]
return fqdn, port
def check_hostkey(module, fqdn):
return not not_in_host_file(module, fqdn)
# this is a variant of code found in connection_plugins/paramiko.py and we should modify
# the paramiko code to import and use this.
def not_in_host_file(self, host):
if 'USER' in os.environ:
user_host_file = os.path.expandvars("~${USER}/.ssh/known_hosts")
else:
user_host_file = "~/.ssh/known_hosts"
user_host_file = os.path.expanduser(user_host_file)
host_file_list = []
host_file_list.append(user_host_file)
host_file_list.append("/etc/ssh/ssh_known_hosts")
host_file_list.append("/etc/ssh/ssh_known_hosts2")
host_file_list.append("/etc/openssh/ssh_known_hosts")
hfiles_not_found = 0
for hf in host_file_list:
if not os.path.exists(hf):
hfiles_not_found += 1
continue
try:
host_fh = open(hf)
except IOError:
hfiles_not_found += 1
continue
else:
data = host_fh.read()
host_fh.close()
for line in data.split("\n"):
if line is None or " " not in line:
continue
tokens = line.split()
if tokens[0].find(HASHED_KEY_MAGIC) == 0:
# this is a hashed known host entry
try:
(kn_salt,kn_host) = tokens[0][len(HASHED_KEY_MAGIC):].split("|",2)
hash = hmac.new(kn_salt.decode('base64'), digestmod=sha1)
hash.update(host)
if hash.digest() == kn_host.decode('base64'):
return False
except:
# invalid hashed host key, skip it
continue
else:
# standard host file entry
if host in tokens[0]:
return False
return True
def add_host_key(module, fqdn, port=22, key_type="rsa", create_dir=False):
""" use ssh-keyscan to add the hostkey """
keyscan_cmd = module.get_bin_path('ssh-keyscan', True)
if 'USER' in os.environ:
user_ssh_dir = os.path.expandvars("~${USER}/.ssh/")
user_host_file = os.path.expandvars("~${USER}/.ssh/known_hosts")
else:
user_ssh_dir = "~/.ssh/"
user_host_file = "~/.ssh/known_hosts"
user_ssh_dir = os.path.expanduser(user_ssh_dir)
if not os.path.exists(user_ssh_dir):
if create_dir:
try:
os.makedirs(user_ssh_dir, int('700', 8))
except:
module.fail_json(msg="failed to create host key directory: %s" % user_ssh_dir)
else:
module.fail_json(msg="%s does not exist" % user_ssh_dir)
elif not os.path.isdir(user_ssh_dir):
module.fail_json(msg="%s is not a directory" % user_ssh_dir)
if port:
this_cmd = "%s -t %s -p %s %s" % (keyscan_cmd, key_type, port, fqdn)
else:
this_cmd = "%s -t %s %s" % (keyscan_cmd, key_type, fqdn)
rc, out, err = module.run_command(this_cmd)
# ssh-keyscan gives a 0 exit code and prints nothins on timeout
if rc != 0 or not out:
module.fail_json(msg='failed to get the hostkey for %s' % fqdn)
module.append_to_file(user_host_file, out)
return rc, out, err
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