optools/gpg/sksdump.py
2017-09-19 05:59:01 -04:00

303 lines
14 KiB
Python
Executable File

#!/usr/bin/env python3
# Thanks to Matt Rude and https://gist.github.com/mattrude/b0ac735d07b0031bb002 so I can know what the hell I'm doing.
import argparse
import configparser
import datetime
import getpass
import os
import subprocess
from pwd import getpwnam
from grp import getgrnam
NOW = datetime.datetime.utcnow()
NOWstr = NOW.strftime('%Y-%m-%d')
# TODO:
# - cleanup/rotation should be optional
cfgfile = os.path.join(os.environ['HOME'], '.sksdump.ini')
def getDefaults():
# Hardcoded defaults
dflt = {'system': {'user': 'sks',
'group': 'sks',
'compress': 'xz',
'svcs': ['sks-db', 'sks-recon'],
'logfile': '/var/log/sksdump.log',
'days': 1,
'dumpkeys': 15000},
'paths': {'basedir': '/var/lib/sks',
'destdir': '/srv/http/sks/dumps',
'rsync': 'root@mirror.square-r00t.net:/srv/http/sks/dumps'},
'runtime': {'nodump': None, 'nocompress': None, 'nosync': None}}
## Build out the default .ini.
dflt_str = ('# IMPORTANT: This script uses certain permissions functions that require some forethought.\n' +
'# You can either run as root, which is the "easy" way, OR you can run as the sks user.\n' +
'# Has to be one or the other; you\'ll SERIOUSLY mess things up otherwise.\n' +
'# If you run as the sks user, MAKE SURE the following is set in your sudoers\n' +
'# (where SKSUSER is the username sks runs as):\n#\tCmnd_Alias SKSCMDS = ' +
'/usr/bin/systemctl start sks-db,\\\n#\t\t/usr/bin/systemctl stop sks-db,\\\n#\t\t' +
'/usr/bin/systemctl start sks-recon,\\\n#\t\t/usr/bin/systemctl stop sks-recon\n#\t' +
'SKSUSER ALL = NOPASSWD: SKSCMDS\n\n')
dflt_str += ('# This was written for systemd systems only. Tweaking would be needed for non-systemd systems\n' +
'# (since every non-systemd uses their own init system callables...)\n\n')
# [system]
d = dflt['system']
dflt_str += ('## SKSDUMP CONFIG FILE ##\n\n# This section controls various system configuration.\n' +
'[system]\n# This should be the user SKS runs as.\nuser = {0}\n# This is the group that' +
'SKS runs as.\ngroup = {1}\n# If None, don\'t compress dumps.\n# If one of: ' +
'xz, gz, bz2, or lrz (for lrzip) then use that compression algo.\ncompress = {2}\n' +
'# These services will be started/stopped, in order, before/after dumps. ' +
'Comma-separated.\nsvcs = {3}\n# The path to the logfile.\nlogfile = {4}\n# The number ' +
'of days of rotated key dumps. If None, don\'t rotate.\ndays = {5}\n# How many keys to include in each ' +
'dump file.\ndumpkeys = {6}\n\n').format(d['user'],
d['group'],
d['compress'],
','.join(d['svcs']),
d['logfile'],
d['days'],
d['dumpkeys'])
# [paths]
d = dflt['paths']
dflt_str += ('# This section controls where stuff goes and where we should find it.\n[paths]\n# ' +
'Where your SKS DB is.\nbasedir = {0}\n# This is the base directory where the dumps should go.\n' +
'# There will be a sub-directory created for each date.\ndestdir = {1}\n# The ' +
'path for rsyncing the dumps. If None, don\'t rsync.\nrsync = {2}\n\n').format(d['basedir'],
d['destdir'],
d['rsync'])
# [runtime]
d = dflt['runtime']
dflt_str += ('# This section controls runtime options. These can be overridden at the commandline.\n' +
'# They take no values; they\'re merely options.\n[runtime]\n# Don\'t dump any keys.\n' +
'# Useful for dedicated in-transit/prep boxes.\n;nodump\n# Don\'t compress the dumps, even if ' +
'we have a compression scheme specified in [system:compress].\n;nocompress\n# Don\'t sync to' +
'another server/path, even if one is specified in [paths:rsync].\n;nosync\n')
realcfg = configparser.ConfigParser(defaults = dflt, allow_no_value = True)
if not os.path.isfile(cfgfile):
with open(cfgfile, 'w') as f:
f.write(dflt_str)
realcfg.read(cfgfile)
return(realcfg)
def svcMgmt(op, args):
if op not in ('start', 'stop'):
raise ValueError('Operation must be start or stop')
for svc in args['svcs'].split(','):
cmd = ['/usr/bin/systemctl', op, svc.strip()]
if getpass.getuser() != 'root':
cmd.insert(0, 'sudo')
subprocess.run(cmd)
return()
def destPrep(args):
nowdir = os.path.join(args['destdir'], NOWstr)
curdir = os.path.join(args['destdir'], 'current')
PAST = NOW - datetime.timedelta(days = args['days'])
for thisdir, dirs, files in os.walk(args['destdir'], topdown = False):
for f in files:
try: # we use a try here because if the link's broken, the script bails out.
fstat = os.stat(os.path.join(thisdir, f))
mtime = fstat.st_mtime
if int(mtime) < PAST.timestamp():
os.remove(os.path.join(thisdir, f))
except FileNotFoundError: # broken symlink
try:
os.remove(os.path.join(thisdir, f))
except:
pass # just... ignore it. it's fine, whatever.
# Delete if empty dir
if os.path.isdir(thisdir):
if len(os.listdir(thisdir)) == 0:
os.rmdir(thisdir)
for d in dirs:
_dir = os.path.join(thisdir, d)
if os.path.isdir(_dir):
if len(os.listdir(_dir)) == 0:
os.rmdir(os.path.join(thisdir, d))
#try:
# os.removedirs(sks['destdir']) # Remove empty dirs
#except:
# pass # thisisfine.jpg
os.makedirs(nowdir, exist_ok = True)
if getpass.getuser() == 'root':
uid = getpwnam(args['user']).pw_uid
gid = getgrnam(args['group']).gr_gid
for d in (args['destdir'], nowdir): # we COULD set it as part of the os.makedirs, but iirc it doesn't set it for existing dirs
os.chown(d, uid, gid)
if os.path.isdir(curdir):
os.remove(curdir)
os.symlink(NOWstr, curdir, target_is_directory = True)
return()
def dumpDB(args):
destPrep(args)
os.chdir(args['basedir'])
svcMgmt('stop', args)
cmd = ['sks',
'dump',
str(args['dumpkeys']), # How many keys per dump?
os.path.join(args['destdir'], NOWstr), # Where should it go?
'keydump.{0}'.format(NOWstr)] # What the filename prefix should be
if getpass.getuser() == 'root':
cmd2 = ['sudo', '-u', args['user']]
cmd2.extend(cmd)
cmd = cmd2
with open(args['logfile'], 'a') as f:
f.write('===== {0} =====\n'.format(str(datetime.datetime.utcnow())))
subprocess.run(cmd, stdout = f, stderr = f)
svcMgmt('start', args)
return()
def compressDB(args):
if not args['compress']:
return()
curdir = os.path.join(args['destdir'], NOWstr)
for thisdir, dirs, files in os.walk(curdir): # I use os.walk here because we might handle this differently in the future...
files.sort()
for f in files:
fullpath = os.path.join(thisdir, f)
newfile = '{0}.{1}'.format(fullpath, args['compress'])
# TODO: add compressed tarball support.
# However, I can't do this on memory-constrained systems for lrzip.
# See: https://github.com/kata198/python-lrzip/issues/1
with open(args['logfile'], 'a') as f:
f.write('===== {0} Now compressing {1} =====\n'.format(str(datetime.datetime.utcnow()), fullpath))
if args['compress'].lower() == 'gz':
import gzip
with open(fullpath, 'rb') as fh_in, gzip.open(newfile, 'wb') as fh_out:
fh_out.writelines(fh_in)
elif args['compress'].lower() == 'xz':
import lzma
with open(fullpath, 'rb') as fh_in, lzma.open(newfile, 'wb', preset = 9|lzma.PRESET_EXTREME) as fh_out:
fh_out.writelines(fh_in)
elif args['compress'].lower() == 'bz2':
import bz2
with open(fullpath, 'rb') as fh_in, bz2.open(newfile, 'wb') as fh_out:
fh_out.writelines(fh_in)
elif args['compress'].lower() == 'lrz':
import lrzip
with open(fullpath, 'rb') as fh_in, open(newfile, 'wb') as fh_out:
fh_out.write(lrzip.compress(fh_in.read()))
os.remove(fullpath)
if getpass.getuser() == 'root':
uid = getpwnam(args['user']).pw_uid
gid = getgrnam(args['group']).gr_gid
os.chown(newfile, uid, gid)
return()
def syncDB(args):
if not args['rsync']:
return()
cmd = ['rsync',
'-a',
'--delete',
os.path.join(args['destdir'], '.'),
args['rsync']]
with open(args['logfile'], 'a') as f:
f.write('===== {0} Rsyncing to mirror =====\n'.format(str(datetime.datetime.utcnow())))
with open(args['logfile'], 'a') as f:
subprocess.run(cmd, stdout = f, stderr = f)
return()
def parseArgs():
cfg = getDefaults()
system = cfg['system']
paths = cfg['paths']
runtime = cfg['runtime']
args = argparse.ArgumentParser(description = 'sksdump - a tool for dumping the SKS Database',
epilog = 'brent s. || 2017 || https://square-r00t.net')
args.add_argument('-u',
'--user',
default = system['user'],
dest = 'user',
help = 'The user that you run SKS services as.')
args.add_argument('-g',
'--group',
default = system['group'],
dest = 'group',
help = 'The group that SKS services run as.')
args.add_argument('-c',
'--compress',
default = system['compress'],
dest = 'compress',
choices = ['xz', 'gz', 'bz2', 'lrz', None],
help = 'The compression scheme to apply to the dumps.')
args.add_argument('-s',
'--services',
default = system['svcs'],
dest = 'svcs',
help = 'A comma-separated list of services that will be stopped/started for the dump (in the provided order).')
args.add_argument('-l',
'--log',
default = system['logfile'],
dest = 'logfile',
help = 'The path to the logfile.')
args.add_argument('-a',
'--days',
default = system['days'],
dest = 'days',
type = int,
help = 'How many days to keep rotation for.')
args.add_argument('-d',
'--dumpkeys',
default = system['dumpkeys'],
dest = 'dumpkeys',
type = int,
help = 'How many keys to put in each dump.')
args.add_argument('-b',
'--basedir',
default = paths['basedir'],
dest = 'basedir',
help = 'The directory which holds your SKS DB.')
args.add_argument('-e',
'--destdir',
default = paths['destdir'],
dest = 'destdir',
help = 'The directory where the dumps should be saved (a sub-directory with the date will be created).')
args.add_argument('-r',
'--rsync',
default = paths['rsync'],
dest = 'rsync',
help = 'The remote (user@host:/path/) or local (/path/) path to use to sync the dumps to.')
args.add_argument('-D',
'--no-dump',
dest = 'nodump',
action = 'store_true',
default = ('nodump' in runtime),
help = 'Don\'t dump the SKS DB (default is to dump)')
args.add_argument('-C',
'--no-compress',
dest = 'nocompress',
action = 'store_true',
default = ('nocompress' in runtime),
help = 'Don\'t compress the DB dumps (default is to compress)')
args.add_argument('-S',
'--no-sync',
dest = 'nosync',
action = 'store_true',
default = ('nosync' in runtime),
help = 'Don\'t sync the dumps to the remote server.')
varargs = vars(args.parse_args())
return(varargs)
def main():
args = parseArgs()
if getpass.getuser() not in ('root', args['user']):
exit('ERROR: You must be root or {0}!'.format(args['user']))
with open(args['logfile'], 'a') as f:
f.write('===== {0} STARTING =====\n'.format(str(datetime.datetime.utcnow())))
if not args['nodump']:
dumpDB(args)
if not args['nocompress']:
compressDB(args)
if not args['nosync']:
syncDB(args)
with open(args['logfile'], 'a') as f:
f.write('===== {0} DONE =====\n'.format(str(datetime.datetime.utcnow())))
if __name__ == '__main__':
main()