115 lines
3.3 KiB
Python
115 lines
3.3 KiB
Python
#!py
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import logging
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import os.path
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import re
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import subprocess
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cache = {}
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ssh_key_pattern = re.compile("^[^ ]+ (ssh-.+)$")
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log = logging.getLogger(__name__)
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def config_dir():
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if '__master_opts__' in __opts__:
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# run started via salt-ssh
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return __opts__['__master_opts__']['config_dir']
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else:
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# run started via salt
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return __opts__['config_dir']
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def cache_dir():
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if '__master_opts__' in __opts__:
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# run started via salt-ssh
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return __opts__['__master_opts__']['cachedir']
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else:
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# run started via salt
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return __opts__['cachedir']+'/../master'
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def minions():
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if not 'minions' in cache:
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cache['minions'] = __salt__.slsutil.renderer(config_dir() + '/roster')
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return cache['minions']
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def host_variants(minion):
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_variants = [minion]
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def add_port_variant(host):
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if 'port' in minions()[minion]:
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_variants.append("[{}]:{}".format(host, minions()[minion]['port']))
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add_port_variant(minion)
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if 'host' in minions()[minion]:
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host = minions()[minion]['host']
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_variants.append(host)
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add_port_variant(host)
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return _variants
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def host_keys_from_known_hosts(minion, path):
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'''
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Fetches all host keys of the given minion.
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'''
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if not os.path.isfile(path):
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return []
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pubkeys = []
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def fill_pubkeys(host):
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for line in host_key_of(host, path).splitlines():
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match = ssh_key_pattern.search(line)
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if match:
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pubkeys.append(match.group(1))
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# Try the minion ID and its variants first
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for host in host_variants(minion):
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fill_pubkeys(host)
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# When no keys were found ...
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if not pubkeys:
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# ... fetch IP addresses via DNS and try them.
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for host in (salt['dig.A'](minion) + salt['dig.AAAA'](minion)):
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fill_pubkeys(host)
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# When not a single key was found anywhere:
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if not pubkeys:
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log.error("No SSH host key found for {}. "
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"You may need to add it to {}.".format(minion, path))
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return "\n".join(pubkeys)
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def host_key_of(host, path):
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cmd = ["ssh-keygen", "-H", "-F", host, "-f", path]
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call = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE
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)
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out, err = call.communicate()
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if err == '':
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return out
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else:
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log.error("{} failed:\nSTDERR: {}\nSTDOUT: {}".format(
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" ".join(cmd),
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err,
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out
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))
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return ""
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def host_keys(minion_id):
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# Get keys from trusted known_hosts file
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trusted_keys = host_keys_from_known_hosts(minion_id,
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config_dir()+'/known_hosts')
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if trusted_keys:
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return trusted_keys
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# Get keys from host key cache
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cache_file = "{}/known_hosts_salt_ssh/{}.pub".format(cache_dir(), minion_id)
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try:
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with open(cache_file, 'r') as f:
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return f.read()
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except IOError:
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return ''
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def run():
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cache = {} # clear the cache
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config = {
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'public_ssh_host_keys': {},
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'public_ssh_host_names': {}
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}
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for minion in minions().keys():
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config['public_ssh_host_keys'][minion] = host_keys(minion)
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config['public_ssh_host_names'][minion] = minion
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return {'openssh': {'known_hosts': {'salt_ssh': config}}}
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# vim: ts=4:sw=4:syntax=python
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