681 lines
24 KiB
Python
681 lines
24 KiB
Python
#!/usr/bin/python3
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#
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# Convert ntp configuration to chrony
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#
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# Copyright (C) 2018-2019 Miroslav Lichvar <mlichvar@redhat.com>
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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import argparse
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import ipaddress
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import logging
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import os
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import re
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import subprocess
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import sys
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# python2 compatibility hacks
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if sys.version_info[0] < 3:
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from io import open
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reload(sys)
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sys.setdefaultencoding("utf-8")
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class NtpConfiguration(object):
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def __init__(self, root_dir, ntp_conf, step_tickers):
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self.root_dir = root_dir if root_dir != "/" else ""
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self.ntp_conf_path = ntp_conf
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self.step_tickers_path = step_tickers
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# Read and write files using an 8-bit transparent encoding
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self.file_encoding = "latin-1"
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self.enabled_services = set()
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self.step_tickers = []
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self.time_sources = []
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self.fudges = {}
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self.restrictions = {
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# Built-in defaults
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ipaddress.ip_network(u"0.0.0.0/0"): set(),
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ipaddress.ip_network(u"::/0"): set(),
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}
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self.keyfile = ""
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self.keys = []
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self.trusted_keys = []
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self.driftfile = ""
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self.statistics = []
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self.leapfile = ""
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self.tos_options = {}
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self.ignored_directives = set()
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self.ignored_lines = []
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# self.detect_enabled_services()
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self.parse_step_tickers()
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self.parse_ntp_conf()
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def detect_enabled_services(self):
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for service in ["ntpdate", "ntpd", "ntp-wait"]:
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service_path = os.path.join(self.root_dir,
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"etc/systemd/system/multi-user.target.wants/{}.service".format(service))
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if os.path.islink(service_path):
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self.enabled_services.add(service)
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logging.info("Enabled services found in /etc/systemd/system: %s",
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" ".join(self.enabled_services))
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def parse_step_tickers(self):
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if not self.step_tickers_path:
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return
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path = os.path.join(self.root_dir, self.step_tickers_path)
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if not os.path.isfile(path):
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logging.info("Missing %s", path)
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return
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with open(path, encoding=self.file_encoding) as f:
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for line in f:
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line = line[:line.find('#')]
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words = line.split()
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if not words:
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continue
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self.step_tickers.extend(words)
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def parse_ntp_conf(self, path=None):
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if path is None:
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path = os.path.join(self.root_dir, self.ntp_conf_path)
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with open(path, encoding=self.file_encoding) as f:
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logging.info("Reading %s", path)
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for line in f:
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line = line[:line.find('#')]
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words = line.split()
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if not words:
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continue
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if not self.parse_directive(words):
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self.ignored_lines.append(line)
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def parse_directive(self, words):
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name = words.pop(0)
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if name.startswith("logconfig"):
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name = "logconfig"
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if words:
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if name in ["server", "peer", "pool"]:
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return self.parse_source(name, words)
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elif name == "fudge":
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return self.parse_fudge(words)
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elif name == "restrict":
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return self.parse_restrict(words)
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elif name == "tos":
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return self.parse_tos(words)
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elif name == "includefile":
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return self.parse_includefile(words)
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elif name == "keys":
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return self.parse_keys(words)
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elif name == "trustedkey":
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return self.parse_trustedkey(words)
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elif name == "driftfile":
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self.driftfile = words[0]
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elif name == "statistics":
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self.statistics = words
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elif name == "leapfile":
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self.leapfile = words[0]
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else:
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self.ignored_directives.add(name)
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return False
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else:
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self.ignored_directives.add(name)
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return False
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return True
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def parse_source(self, source_type, words):
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ipv4_only = False
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ipv6_only = False
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source = {
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"type": source_type,
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"options": []
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}
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if words[0] == "-4":
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ipv4_only = True
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words.pop(0)
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elif words[0] == "-6":
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ipv6_only = True
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words.pop(0)
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if not words:
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return False
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source["address"] = words.pop(0)
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# Check if -4/-6 corresponds to the address and ignore hostnames
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if ipv4_only or ipv6_only:
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try:
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version = ipaddress.ip_address(source["address"]).version
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if (ipv4_only and version != 4) or (ipv6_only and version != 6):
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return False
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except ValueError:
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return False
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if source["address"].startswith("127.127."):
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if not source["address"].startswith("127.127.1."):
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# Ignore non-LOCAL refclocks
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return False
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while words:
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if len(words) >= 2 and words[0] in ["minpoll", "maxpoll", "version", "key"]:
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source["options"].append((words[0], words[1]))
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words = words[2:]
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elif words[0] in ["burst", "iburst", "noselect", "prefer", "true", "xleave"]:
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source["options"].append((words[0],))
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words.pop(0)
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else:
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return False
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self.time_sources.append(source)
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return True
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def parse_fudge(self, words):
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address = words.pop(0)
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options = {}
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while words:
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if len(words) >= 2 and words[0] in ["stratum"]:
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if not words[1].isdigit():
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return False
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options[words[0]] = int(words[1])
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words = words[2:]
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elif len(words) >= 2:
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words = words[2:]
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else:
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return False
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self.fudges[address] = options
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return True
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def parse_restrict(self, words):
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ipv4_only = False
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ipv6_only = False
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flags = set()
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mask = ""
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if words[0] == "-4":
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ipv4_only = True
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words.pop(0)
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elif words[0] == "-6":
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ipv6_only = True
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words.pop(0)
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if not words:
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return False
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address = words.pop(0)
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while words:
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if len(words) >= 2 and words[0] == "mask":
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mask = words[1]
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words = words[2:]
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else:
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if words[0] not in ["kod", "nomodify", "notrap", "nopeer", "noquery",
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"limited", "ignore", "noserve"]:
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return False
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flags.add(words[0])
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words.pop(0)
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# Convert to IP network(s), ignoring restrictions with hostnames
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networks = []
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if address == "default" and not mask:
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if not ipv6_only:
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networks.append(ipaddress.ip_network(u"0.0.0.0/0"))
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if not ipv4_only:
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networks.append(ipaddress.ip_network(u"::/0"))
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else:
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try:
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if mask:
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# Count bits in the mask (ipaddress does not support
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# expanded IPv6 netmasks)
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mask_ip = ipaddress.ip_address(mask)
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mask_str = "{0:0{1}b}".format(int(mask_ip), mask_ip.max_prefixlen)
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networks.append(ipaddress.ip_network(
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u"{}/{}".format(address, len(mask_str.rstrip('0')))))
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else:
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networks.append(ipaddress.ip_network(address))
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except ValueError:
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return False
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if (ipv4_only and networks[-1].version != 4) or \
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(ipv6_only and networks[-1].version != 6):
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return False
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for network in networks:
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self.restrictions[network] = flags
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return True
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def parse_tos(self, words):
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options = {}
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while words:
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if len(words) >= 2 and words[0] in ["minsane", "orphan"]:
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if not words[1].isdigit():
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return False
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options[words[0]] = int(words[1])
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words = words[2:]
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elif len(words) >= 2 and words[0] in ["maxdist"]:
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# Check if it is a float value
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if not words[1].replace('.', '', 1).isdigit():
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return False
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options[words[0]] = float(words[1])
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words = words[2:]
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else:
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return False
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self.tos_options.update(options)
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return True
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def parse_includefile(self, words):
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path = os.path.join(self.root_dir, words[0])
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if not os.path.isfile(path):
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return False
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self.parse_ntp_conf(path)
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return True
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def parse_keys(self, words):
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keyfile = words[0]
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path = os.path.join(self.root_dir, keyfile)
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if not os.path.isfile(path):
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logging.info("Missing %s", path)
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return False
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with open(path, encoding=self.file_encoding) as f:
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logging.info("Reading %s", path)
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keys = []
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for line in f:
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words = line.split()
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if len(words) < 3 or not words[0].isdigit():
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continue
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keys.append((int(words[0]), words[1], words[2]))
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self.keyfile = keyfile
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self.keys = keys
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return True
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def parse_trustedkey(self, words):
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key_ranges = []
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for word in words:
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if word.isdigit():
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key_ranges.append((int(word), int(word)))
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elif re.match("^[0-9]+-[0-9]+$", word):
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first, last = word.split("-")
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key_ranges.append((int(first), int(last)))
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else:
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return False
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self.trusted_keys = key_ranges
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return True
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def write_chrony_configuration(self, chrony_conf_path, chrony_keys_path,
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dry_run=False, backup=False):
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chrony_conf = self.get_chrony_conf(chrony_keys_path)
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logging.debug("Generated %s:\n%s", chrony_conf_path, chrony_conf)
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if not dry_run:
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self.write_file(chrony_conf_path, 0o644, chrony_conf, backup)
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chrony_keys = self.get_chrony_keys()
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if chrony_keys:
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logging.debug("Generated %s:\n%s", chrony_keys_path, chrony_keys)
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if not dry_run:
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self.write_file(chrony_keys_path, 0o640, chrony_keys, backup)
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def get_processed_time_sources(self):
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# Convert {0,1,2,3}.*pool.ntp.org servers to 2.*pool.ntp.org pools
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# Make shallow copies of all sources (only type will be modified)
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time_sources = [s.copy() for s in self.time_sources]
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pools = {}
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for source in time_sources:
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if source["type"] != "server":
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continue
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m = re.match("^([0123])(\\.\\w+)?\\.pool\\.ntp\\.org$", source["address"])
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if m is None:
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continue
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number = m.group(1)
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zone = m.group(2)
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if zone not in pools:
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pools[zone] = []
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pools[zone].append((int(number), source))
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remove_servers = set()
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for zone, pool in pools.items():
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# sort and skip all pools not in [0, 3] range
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pool.sort()
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if [number for number, source in pool] != [0, 1, 2, 3]:
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# only exact group of 4 servers can be converted, nothing to do here
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continue
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# verify that parameters are the same for all servers in the pool
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if not all([p[1]["options"] == pool[0][1]["options"] for p in pool]):
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break
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remove_servers.update([pool[i][1]["address"] for i in [0, 1, 3]])
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pool[2][1]["type"] = "pool"
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processed_sources = []
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for source in time_sources:
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if source["type"] == "server" and source["address"] in remove_servers:
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continue
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processed_sources.append(source)
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return processed_sources
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def get_chrony_conf_sources(self):
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conf = ""
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if self.step_tickers:
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conf += "# Specify NTP servers used for initial correction.\n"
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conf += "initstepslew 0.1 {}\n".format(" ".join(self.step_tickers))
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conf += "\n"
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conf += "# Specify time sources.\n"
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for source in self.get_processed_time_sources():
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address = source["address"]
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if address.startswith("127.127."):
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if address.startswith("127.127.1."):
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continue
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# No other refclocks are expected from the parser
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assert False
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else:
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conf += "{} {}".format(source["type"], address)
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for option in source["options"]:
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if option[0] in ["minpoll", "maxpoll", "version", "key",
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"iburst", "noselect", "prefer", "xleave"]:
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conf += " {}".format(" ".join(option))
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elif option[0] == "burst":
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conf += " presend 6"
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elif option[0] == "true":
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conf += " trust"
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else:
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# No other options are expected from the parser
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assert False
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conf += "\n"
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conf += "\n"
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return conf
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def get_chrony_conf_allows(self):
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allowed_networks = filter(lambda n: "ignore" not in self.restrictions[n] and
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"noserve" not in self.restrictions[n],
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self.restrictions.keys())
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conf = ""
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for network in sorted(allowed_networks, key=lambda n: (n.version, n)):
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if network.num_addresses > 1:
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conf += "allow {}\n".format(network)
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else:
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conf += "allow {}\n".format(network.network_address)
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if conf:
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conf = "# Allow NTP client access.\n" + conf
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conf += "\n"
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return conf
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def get_chrony_conf_cmdallows(self):
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allowed_networks = filter(lambda n: "ignore" not in self.restrictions[n] and
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"noquery" not in self.restrictions[n] and
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n != ipaddress.ip_network(u"127.0.0.1/32") and
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n != ipaddress.ip_network(u"::1/128"),
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self.restrictions.keys())
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ip_versions = set()
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conf = ""
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for network in sorted(allowed_networks, key=lambda n: (n.version, n)):
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ip_versions.add(network.version)
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if network.num_addresses > 1:
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conf += "cmdallow {}\n".format(network)
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else:
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conf += "cmdallow {}\n".format(network.network_address)
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if conf:
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conf = "# Allow remote monitoring.\n" + conf
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if 4 in ip_versions:
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conf += "bindcmdaddress 0.0.0.0\n"
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if 6 in ip_versions:
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conf += "bindcmdaddress ::\n"
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conf += "\n"
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return conf
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def get_chrony_conf(self, chrony_keys_path):
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local_stratum = 0
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maxdistance = 0.0
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minsources = 1
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orphan_stratum = 0
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logs = []
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for source in self.time_sources:
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address = source["address"]
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if address.startswith("127.127.1."):
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if address in self.fudges and "stratum" in self.fudges[address]:
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local_stratum = self.fudges[address]["stratum"]
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else:
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local_stratum = 5
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if "maxdist" in self.tos_options:
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maxdistance = self.tos_options["maxdist"]
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if "minsane" in self.tos_options:
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minsources = self.tos_options["minsane"]
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if "orphan" in self.tos_options:
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orphan_stratum = self.tos_options["orphan"]
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if "clockstats" in self.statistics:
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logs.append("refclocks")
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if "loopstats" in self.statistics:
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logs.append("tracking")
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if "peerstats" in self.statistics:
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logs.append("statistics")
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if "rawstats" in self.statistics:
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logs.append("measurements")
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conf = "# This file was converted from {}{}.\n".format(
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self.ntp_conf_path,
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" and " + self.step_tickers_path if self.step_tickers_path else "")
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conf += "\n"
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if self.ignored_lines:
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conf += "# The following directives were ignored in the conversion:\n"
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for line in self.ignored_lines:
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# Remove sensitive information
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line = re.sub(r"\s+pw\s+\S+", " pw XXX", line.rstrip())
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conf += "# " + line + "\n"
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conf += "\n"
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conf += self.get_chrony_conf_sources()
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conf += "# Record the rate at which the system clock gains/losses time.\n"
|
|
if not self.driftfile:
|
|
conf += "#"
|
|
conf += "driftfile /var/lib/chrony/drift\n"
|
|
conf += "\n"
|
|
|
|
conf += "# Allow the system clock to be stepped in the first three updates\n"
|
|
conf += "# if its offset is larger than 1 second.\n"
|
|
conf += "makestep 1.0 3\n"
|
|
conf += "\n"
|
|
|
|
conf += "# Enable kernel synchronization of the real-time clock (RTC).\n"
|
|
conf += "rtcsync\n"
|
|
conf += "\n"
|
|
|
|
conf += "# Enable hardware timestamping on all interfaces that support it.\n"
|
|
conf += "#hwtimestamp *\n"
|
|
conf += "\n"
|
|
|
|
if maxdistance > 0.0:
|
|
conf += "# Specify the maximum distance of sources to be selectable.\n"
|
|
conf += "maxdistance {}\n".format(maxdistance)
|
|
conf += "\n"
|
|
|
|
conf += "# Increase the minimum number of selectable sources required to adjust\n"
|
|
conf += "# the system clock.\n"
|
|
if minsources > 1:
|
|
conf += "minsources {}\n".format(minsources)
|
|
else:
|
|
conf += "#minsources 2\n"
|
|
conf += "\n"
|
|
|
|
conf += self.get_chrony_conf_allows()
|
|
|
|
conf += self.get_chrony_conf_cmdallows()
|
|
|
|
conf += "# Serve time even if not synchronized to a time source.\n"
|
|
if orphan_stratum > 0 and orphan_stratum < 16:
|
|
conf += "local stratum {} orphan\n".format(orphan_stratum)
|
|
elif local_stratum > 0 and local_stratum < 16:
|
|
conf += "local stratum {}\n".format(local_stratum)
|
|
else:
|
|
conf += "#local stratum 10\n"
|
|
conf += "\n"
|
|
|
|
conf += "# Specify file containing keys for NTP authentication.\n"
|
|
conf += "keyfile {}\n".format(chrony_keys_path)
|
|
conf += "\n"
|
|
|
|
conf += "# Get TAI-UTC offset and leap seconds from the system tz database.\n"
|
|
conf += "leapsectz right/UTC\n"
|
|
conf += "\n"
|
|
|
|
conf += "# Specify directory for log files.\n"
|
|
conf += "logdir /var/log/chrony\n"
|
|
conf += "\n"
|
|
|
|
conf += "# Select which information is logged.\n"
|
|
if logs:
|
|
conf += "log {}\n".format(" ".join(logs))
|
|
else:
|
|
conf += "#log measurements statistics tracking\n"
|
|
|
|
return conf
|
|
|
|
def get_chrony_keys(self):
|
|
if not self.keyfile:
|
|
return ""
|
|
|
|
keys = "# This file was converted from {}.\n".format(self.keyfile)
|
|
keys += "\n"
|
|
|
|
for key in self.keys:
|
|
key_id = key[0]
|
|
key_type = key[1]
|
|
password = key[2]
|
|
|
|
if key_type in ["m", "M"]:
|
|
key_type = "MD5"
|
|
elif key_type == "AES128CMAC":
|
|
key_type = "AES128"
|
|
elif key_type not in ["MD5", "SHA1", "SHA256", "SHA384", "SHA512"]:
|
|
continue
|
|
|
|
prefix = "ASCII" if len(password) <= 20 else "HEX"
|
|
|
|
for first, last in self.trusted_keys:
|
|
if first <= key_id <= last:
|
|
trusted = True
|
|
break
|
|
else:
|
|
trusted = False
|
|
|
|
# Disable keys that were not marked as trusted
|
|
if not trusted:
|
|
keys += "#"
|
|
|
|
keys += "{} {} {}:{}\n".format(key_id, key_type, prefix, password)
|
|
|
|
return keys
|
|
|
|
def write_file(self, path, mode, content, backup):
|
|
path = self.root_dir + path
|
|
if backup and os.path.isfile(path):
|
|
os.rename(path, path + ".old")
|
|
|
|
with open(os.open(path, os.O_CREAT | os.O_WRONLY | os.O_EXCL, mode), "w",
|
|
encoding=self.file_encoding) as f:
|
|
logging.info("Writing %s", path)
|
|
f.write(u"" + content)
|
|
|
|
# Fix SELinux context if restorecon is installed
|
|
try:
|
|
subprocess.call(["restorecon", path])
|
|
except OSError:
|
|
pass
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(description="Convert ntp configuration to chrony.")
|
|
parser.add_argument("-r", "--root", dest="roots", default=["/"], nargs="+",
|
|
metavar="DIR", help="specify root directory (default /)")
|
|
parser.add_argument("--ntp-conf", action="store", default="/etc/ntp.conf",
|
|
metavar="FILE", help="specify ntp config (default /etc/ntp.conf)")
|
|
parser.add_argument("--step-tickers", action="store", default="",
|
|
metavar="FILE", help="specify ntpdate step-tickers config (no default)")
|
|
parser.add_argument("--chrony-conf", action="store", default="/etc/chrony.conf",
|
|
metavar="FILE", help="specify chrony config (default /etc/chrony.conf)")
|
|
parser.add_argument("--chrony-keys", action="store", default="/etc/chrony.keys",
|
|
metavar="FILE", help="specify chrony keyfile (default /etc/chrony.keys)")
|
|
parser.add_argument("-b", "--backup", action="store_true", help="backup existing configs before writing")
|
|
parser.add_argument("-L", "--ignored-lines", action="store_true", help="print ignored lines")
|
|
parser.add_argument("-D", "--ignored-directives", action="store_true",
|
|
help="print names of ignored directives")
|
|
parser.add_argument("-n", "--dry-run", action="store_true", help="don't make any changes")
|
|
parser.add_argument("-v", "--verbose", action="count", default=0, help="increase verbosity")
|
|
|
|
args = parser.parse_args()
|
|
|
|
logging.basicConfig(format="%(message)s",
|
|
level=[logging.ERROR, logging.INFO, logging.DEBUG][min(args.verbose, 2)])
|
|
|
|
for root in args.roots:
|
|
conf = NtpConfiguration(root, args.ntp_conf, args.step_tickers)
|
|
|
|
if args.ignored_lines:
|
|
for line in conf.ignored_lines:
|
|
print(line)
|
|
|
|
if args.ignored_directives:
|
|
for directive in conf.ignored_directives:
|
|
print(directive)
|
|
|
|
conf.write_chrony_configuration(args.chrony_conf, args.chrony_keys, args.dry_run, args.backup)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|