make-secnet-sites

   1 #! /usr/bin/env python3
   2 #
   3 # This file is part of secnet.
   4 # See README for full list of copyright holders.
   5 #
   6 # secnet is free software; you can redistribute it and/or modify it
   7 # under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # secnet is distributed in the hope that it will be useful, but
  12 # WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # version 3 along with secnet; if not, see
  18 # https://www.gnu.org/licenses/gpl.html.
  19
  20 """VPN sites file manipulation.
  21
  22 This program enables VPN site descriptions to be submitted for
  23 inclusion in a central database, and allows the resulting database to
  24 be turned into a secnet configuration file.
  25
  26 A database file can be turned into a secnet configuration file simply:
  27 make-secnet-sites.py [infile [outfile]]
  28
  29 It would be wise to run secnet with the "--just-check-config" option
  30 before installing the output on a live system.
  31
  32 The program expects to be invoked via userv to manage the database; it
  33 relies on the USERV_USER and USERV_GROUP environment variables. The
  34 command line arguments for this invocation are:
  35
  36 make-secnet-sites.py -u header-filename groupfiles-directory output-file \
  37   group
  38
  39 All but the last argument are expected to be set by userv; the 'group'
  40 argument is provided by the user. A suitable userv configuration file
  41 fragment is:
  42
  43 reset
  44 no-disconnect-hup
  45 no-suppress-args
  46 cd ~/secnet/sites-test/
  47 execute ~/secnet/make-secnet-sites.py -u vpnheader groupfiles sites
  48
  49 This program is part of secnet.
  50
  51 """
  52
  53 from __future__ import print_function
  54 from __future__ import unicode_literals
  55 from builtins import int
  56
  57 import string
  58 import time
  59 import sys
  60 import os
  61 import getopt
  62 import re
  63 import argparse
  64 import math
  65
  66 import ipaddress
  67
  68 # entry 0 is "near the executable", or maybe from PYTHONPATH=.,
  69 # which we don't want to preempt
  70 sys.path.insert(1,"/usr/local/share/secnet")
  71 sys.path.insert(1,"/usr/share/secnet")
  72 import ipaddrset
  73 import base91
  74
  75 from argparseactionnoyes import ActionNoYes
  76
  77 VERSION="0.1.18"
  78
  79 max_version = 2
  80
  81 from sys import version_info
  82 if version_info.major == 2:  # for python2
  83     import codecs
  84     sys.stdin = codecs.getreader('utf-8')(sys.stdin)
  85     sys.stdout = codecs.getwriter('utf-8')(sys.stdout)
  86     import io
  87     open=lambda f,m='r': io.open(f,m,encoding='utf-8')
  88
  89 max={'rsa_bits':8200,'name':33,'dh_bits':8200,'algname':127}
  90
  91 def debugrepr(*args):
  92         if debug_level > 0:
  93                 print(repr(args), file=sys.stderr)
  94
  95 def base91s_encode(bindata):
  96         return base91.encode(bindata).replace('"',"-")
  97
  98 def base91s_decode(string):
  99         return base91.decode(string.replace("-",'"'))
 100
 101 class Tainted:
 102         def __init__(self,s,tline=None,tfile=None):
 103                 self._s=s
 104                 self._ok=None
 105                 self._line=line if tline is None else tline
 106                 self._file=file if tfile is None else tfile
 107         def __eq__(self,e):
 108                 return self._s==e
 109         def __ne__(self,e):
 110                 # for Python2
 111                 return not self.__eq__(e)
 112         def __str__(self):
 113                 raise RuntimeError('direct use of Tainted value')
 114         def __repr__(self):
 115                 return 'Tainted(%s)' % repr(self._s)
 116
 117         def _bad(self,what,why):
 118                 assert(self._ok is not True)
 119                 self._ok=False
 120                 complain('bad parameter: %s: %s' % (what, why))
 121                 return False
 122
 123         def _max_ok(self,what,maxlen):
 124                 if len(self._s) > maxlen:
 125                         return self._bad(what,'too long (max %d)' % maxlen)
 126                 return True
 127
 128         def _re_ok(self,bad,what,maxlen=None):
 129                 if maxlen is None: maxlen=max[what]
 130                 self._max_ok(what,maxlen)
 131                 if self._ok is False: return False
 132                 if bad.search(self._s):
 133                         #print(repr(self), file=sys.stderr)
 134                         return self._bad(what,'bad syntax')
 135                 return True
 136
 137         def _rtnval(self, is_ok, ifgood, ifbad=''):
 138                 if is_ok:
 139                         assert(self._ok is not False)
 140                         self._ok=True
 141                         return ifgood
 142                 else:
 143                         assert(self._ok is not True)
 144                         self._ok=False
 145                         return ifbad
 146
 147         def _rtn(self, is_ok, ifbad=''):
 148                 return self._rtnval(is_ok, self._s, ifbad)
 149
 150         def raw(self):
 151                 return self._s
 152         def raw_mark_ok(self):
 153                 # caller promises to throw if syntax was dangeorus
 154                 return self._rtn(True)
 155
 156         def output(self):
 157                 if self._ok is False: return ''
 158                 if self._ok is True: return self._s
 159                 print('%s:%d: unchecked/unknown additional data "%s"' %
 160                       (self._file,self._line,self._s),
 161                       file=sys.stderr)
 162                 sys.exit(1)
 163
 164         bad_name=re.compile(r'^[^a-zA-Z]|[^-_0-9a-zA-Z]')
 165         # secnet accepts _ at start of names, but we reserve that
 166         bad_name_counter=0
 167         def name(self,what='name'):
 168                 ok=self._re_ok(Tainted.bad_name,what)
 169                 return self._rtn(ok,
 170                                  '_line%d_%s' % (self._line, id(self)))
 171
 172         def keyword(self):
 173                 ok=self._s in keywords or self._s in levels
 174                 if not ok:
 175                         complain('unknown keyword %s' % self._s)
 176                 return self._rtn(ok)
 177
 178         bad_hex=re.compile(r'[^0-9a-fA-F]')
 179         def bignum_16(self,kind,what):
 180                 maxlen=(max[kind+'_bits']+3)/4
 181                 ok=self._re_ok(Tainted.bad_hex,what,maxlen)
 182                 return self._rtn(ok)
 183
 184         bad_num=re.compile(r'[^0-9]')
 185         def bignum_10(self,kind,what):
 186                 maxlen=math.ceil(max[kind+'_bits'] / math.log10(2))
 187                 ok=self._re_ok(Tainted.bad_num,what,maxlen)
 188                 return self._rtn(ok)
 189
 190         def number(self,minn,maxx,what='number'):
 191                 # not for bignums
 192                 ok=self._re_ok(Tainted.bad_num,what,10)
 193                 if ok:
 194                         v=int(self._s)
 195                         if v<minn or v>maxx:
 196                                 ok=self._bad(what,'out of range %d..%d'
 197                                              % (minn,maxx))
 198                 return self._rtnval(ok,v,minn)
 199
 200         def hexid(self,byteslen,what):
 201                 ok=self._re_ok(Tainted.bad_hex,what,byteslen*2)
 202                 if ok:
 203                         if len(self._s) < byteslen*2:
 204                                 ok=self._bad(what,'too short')
 205                 return self._rtn(ok,ifbad='00'*byteslen)
 206
 207         bad_host=re.compile(r'[^-\][_.:0-9a-zA-Z]')
 208         # We permit _ so we can refer to special non-host domains
 209         # which have A and AAAA RRs.  This is a crude check and we may
 210         # still produce config files with syntactically invalid
 211         # domains or addresses, but that is OK.
 212         def host(self):
 213                 ok=self._re_ok(Tainted.bad_host,'host/address',255)
 214                 return self._rtn(ok)
 215
 216         bad_email=re.compile(r'[^-._0-9a-z@!$%^&*=+~/]')
 217         # ^ This does not accept all valid email addresses.  That's
 218         # not really possible with this input syntax.  It accepts
 219         # all ones that don't require quoting anywhere in email
 220         # protocols (and also accepts some invalid ones).
 221         def email(self):
 222                 ok=self._re_ok(Tainted.bad_email,'email address',1023)
 223                 return self._rtn(ok)
 224
 225         bad_groupname=re.compile(r'^[^_A-Za-z]|[^-+_0-9A-Za-z]')
 226         def groupname(self):
 227                 ok=self._re_ok(Tainted.bad_groupname,'group name',64)
 228                 return self._rtn(ok)
 229
 230         bad_base91=re.compile(r'[^!-~]|[\'\"\\]')
 231         def base91(self,what='base91'):
 232                 ok=self._re_ok(Tainted.bad_base91,what,4096)
 233                 return self._rtn(ok)
 234
 235 class ArgActionLambda(argparse.Action):
 236         def __init__(self, fn, **kwargs):
 237                 self.fn=fn
 238                 argparse.Action.__init__(self,**kwargs)
 239         def __call__(self,ap,ns,values,option_string):
 240                 self.fn(values,ns,ap,option_string)
 241
 242 def parse_args():
 243         global service
 244         global inputfile
 245         global header
 246         global groupfiledir
 247         global sitesfile
 248         global outputfile
 249         global group
 250         global user
 251         global of
 252         global prefix
 253         global key_prefix
 254         global debug_level
 255         global output_version
 256         global pubkeys_dir
 257         global pubkeys_install
 258
 259         ap = argparse.ArgumentParser(description='process secnet sites files')
 260         ap.add_argument('--userv', '-u', action='store_true',
 261                         help='userv service fragment update mode')
 262         ap.add_argument('--conf-key-prefix', action=ActionNoYes,
 263                         default=True,
 264                  help='prefix conf file key names derived from sites data')
 265         ap.add_argument('--pubkeys-install', action='store_true',
 266                         help='install public keys in public key directory')
 267         ap.add_argument('--pubkeys-dir',  nargs=1,
 268                         help='public key directory',
 269                         default=['/var/lib/secnet/pubkeys'])
 270         ap.add_argument('--output-version', nargs=1, type=int,
 271                         help='sites file output version',
 272                         default=[max_version])
 273         ap.add_argument('--prefix', '-P', nargs=1,
 274                         help='set prefix')
 275         ap.add_argument('--debug', '-D', action='count', default=0)
 276         ap.add_argument('arg',nargs=argparse.REMAINDER)
 277         av = ap.parse_args()
 278         debug_level = av.debug
 279         debugrepr('av',av)
 280         service = 1 if av.userv else 0
 281         prefix = '' if av.prefix is None else av.prefix[0]
 282         key_prefix = av.conf_key_prefix
 283         output_version = av.output_version[0]
 284         pubkeys_dir = av.pubkeys_dir[0]
 285         pubkeys_install = av.pubkeys_install
 286         if service:
 287                 if len(av.arg)!=4:
 288                         print("Wrong number of arguments")
 289                         sys.exit(1)
 290                 (header, groupfiledir, sitesfile, group) = av.arg
 291                 group = Tainted(group,0,'command line')
 292                 # untrusted argument from caller
 293                 if "USERV_USER" not in os.environ:
 294                         print("Environment variable USERV_USER not found")
 295                         sys.exit(1)
 296                 user=os.environ["USERV_USER"]
 297                 # Check that group is in USERV_GROUP
 298                 if "USERV_GROUP" not in os.environ:
 299                         print("Environment variable USERV_GROUP not found")
 300                         sys.exit(1)
 301                 ugs=os.environ["USERV_GROUP"]
 302                 ok=0
 303                 for i in ugs.split():
 304                         if group==i: ok=1
 305                 if not ok:
 306                         print("caller not in group %s"%group)
 307                         sys.exit(1)
 308         else:
 309                 if len(av.arg)>3:
 310                         print("Too many arguments")
 311                         sys.exit(1)
 312                 (inputfile, outputfile) = (av.arg + [None]*2)[0:2]
 313
 314 parse_args()
 315
 316 # Classes describing possible datatypes in the configuration file
 317
 318 class basetype:
 319         "Common protocol for configuration types."
 320         def add(self,obj,w):
 321                 complain("%s %s already has property %s defined"%
 322                         (obj.type,obj.name,w[0].raw()))
 323         def forsites(self,version,copy,fs):
 324                 return copy
 325
 326 class conflist:
 327         "A list of some kind of configuration type."
 328         def __init__(self,subtype,w):
 329                 self.subtype=subtype
 330                 self.list=[subtype(w)]
 331         def add(self,obj,w):
 332                 self.list.append(self.subtype(w))
 333         def __str__(self):
 334                 return ', '.join(map(str, self.list))
 335         def forsites(self,version,copy,fs):
 336                 most_recent=self.list[len(self.list)-1]
 337                 return most_recent.forsites(version,copy,fs)
 338 def listof(subtype):
 339         return lambda w: conflist(subtype, w)
 340
 341 class single_ipaddr (basetype):
 342         "An IP address"
 343         def __init__(self,w):
 344                 self.addr=ipaddress.ip_address(w[1].raw_mark_ok())
 345         def __str__(self):
 346                 return '"%s"'%self.addr
 347
 348 class networks (basetype):
 349         "A set of IP addresses specified as a list of networks"
 350         def __init__(self,w):
 351                 self.set=ipaddrset.IPAddressSet()
 352                 for i in w[1:]:
 353                         x=ipaddress.ip_network(i.raw_mark_ok(),strict=True)
 354                         self.set.append([x])
 355         def __str__(self):
 356                 return ",".join(map((lambda n: '"%s"'%n), self.set.networks()))
 357
 358 class dhgroup (basetype):
 359         "A Diffie-Hellman group"
 360         def __init__(self,w):
 361                 self.mod=w[1].bignum_16('dh','dh mod')
 362                 self.gen=w[2].bignum_16('dh','dh gen')
 363         def __str__(self):
 364                 return 'diffie-hellman("%s","%s")'%(self.mod,self.gen)
 365
 366 class hash (basetype):
 367         "A choice of hash function"
 368         def __init__(self,w):
 369                 hname=w[1]
 370                 self.ht=hname.raw()
 371                 if (self.ht!='md5' and self.ht!='sha1'):
 372                         complain("unknown hash type %s"%(self.ht))
 373                         self.ht=None
 374                 else:
 375                         hname.raw_mark_ok()
 376         def __str__(self):
 377                 return '%s'%(self.ht)
 378
 379 class email (basetype):
 380         "An email address"
 381         def __init__(self,w):
 382                 self.addr=w[1].email()
 383         def __str__(self):
 384                 return '<%s>'%(self.addr)
 385
 386 class boolean (basetype):
 387         "A boolean"
 388         def __init__(self,w):
 389                 v=w[1]
 390                 if re.match('[TtYy1]',v.raw()):
 391                         self.b=True
 392                         v.raw_mark_ok()
 393                 elif re.match('[FfNn0]',v.raw()):
 394                         self.b=False
 395                         v.raw_mark_ok()
 396                 else:
 397                         complain("invalid boolean value");
 398         def __str__(self):
 399                 return ['False','True'][self.b]
 400
 401 class num (basetype):
 402         "A decimal number"
 403         def __init__(self,w):
 404                 self.n=w[1].number(0,0x7fffffff)
 405         def __str__(self):
 406                 return '%d'%(self.n)
 407
 408 class serial (basetype):
 409         def __init__(self,w):
 410                 self.i=w[1].hexid(4,'serial')
 411         def __str__(self):
 412                 return self.i
 413         def forsites(self,version,copy,fs):
 414                 if version < 2: return []
 415                 return copy
 416
 417 class address (basetype):
 418         "A DNS name and UDP port number"
 419         def __init__(self,w):
 420                 self.adr=w[1].host()
 421                 self.port=w[2].number(1,65536,'port')
 422         def __str__(self):
 423                 return '"%s"; port %d'%(self.adr,self.port)
 424
 425 class pubkey (basetype):
 426         "Some kind of publie key"
 427         def __init__(self,w):
 428                 self.a=w[1].name('algname')
 429                 self.d=w[2].base91();
 430         def __str__(self):
 431                 return 'make-public("%s","%s")'%(self.a,self.d)
 432         def forsites(self,version,xcopy,fs):
 433                 if version < 2: return []
 434                 return ['pub', self.a, self.d]
 435         # forsites for properties which are from
 436         # keywords with kw[2]=='pub' may not use copy.
 437         # This is because the property values can be
 438         # written out in sites file format during sites.conf
 439         # construction (with --pubkeys-install), in which case
 440         # the original input line is no longer available.
 441
 442 class rsakey (pubkey):
 443         "An RSA public key"
 444         def __init__(self,w):
 445                 self.l=w[1].number(0,max['rsa_bits'],'rsa len')
 446                 self.e=w[2].bignum_10('rsa','rsa e')
 447                 self.n=w[3].bignum_10('rsa','rsa n')
 448                 if len(w) >= 5: w[4].email()
 449                 self.a='rsa1'
 450                 self.d=base91s_encode(b'%d %s %s' %
 451                                       (self.l,
 452                                        self.e.encode('ascii'),
 453                                        self.n.encode('ascii')))
 454                 # ^ this allows us to use the pubkey.forsites()
 455                 # method for output in versions>=2
 456         def __str__(self):
 457                 return 'rsa-public("%s","%s")'%(self.e,self.n)
 458                 # this specialisation means we can generate files
 459                 # compatible with old secnet executables
 460         def forsites(self,version,xcopy,fs):
 461                 if version < 2:
 462                         return ['pubkey', str(self.l), self.e, self.n]
 463                 return pubkey.forsites(self,version,xcopy,fs)
 464
 465 class rsakey_newfmt(rsakey):
 466         "An old-style RSA public key in new-style sites format"
 467         # This is its own class simply to have its own constructor.
 468         def __init__(self,w):
 469                 self.a=w[1].name()
 470                 assert(self.a == 'rsa1')
 471                 self.d=w[2].base91()
 472                 try:
 473                         w_inner=list(map(Tainted,
 474                                         ['X-PUB-RSA1'] +
 475                                         base91s_decode(self.d)
 476                                         .decode('ascii')
 477                                         .split(' ')))
 478                 except UnicodeDecodeError:
 479                         complain('rsa1 key in new format has bad base91')
 480                 #print(repr(w_inner), file=sys.stderr)
 481                 rsakey.__init__(self,w_inner)
 482 def somepubkey(w):
 483         if w[0]=='pubkey':
 484                 return rsakey(w)
 485         elif w[0]=='pub' and w[1]=='rsa1':
 486                 return rsakey_newfmt(w)
 487         elif w[0]=='pub':
 488                 return pubkey(w)
 489         else:
 490                 assert(False)
 491
 492 # Possible properties of configuration nodes
 493 keywords={
 494  'contact':(email,"Contact address"),
 495  'dh':(dhgroup,"Diffie-Hellman group"),
 496  'hash':(hash,"Hash function"),
 497  'key-lifetime':(num,"Maximum key lifetime (ms)"),
 498  'setup-timeout':(num,"Key setup timeout (ms)"),
 499  'setup-retries':(num,"Maximum key setup packet retries"),
 500  'wait-time':(num,"Time to wait after unsuccessful key setup (ms)"),
 501  'renegotiate-time':(num,"Time after key setup to begin renegotiation (ms)"),
 502  'restrict-nets':(networks,"Allowable networks"),
 503  'networks':(networks,"Claimed networks"),
 504  'serial':(serial,"public key set serial"),
 505  'pub':(listof(somepubkey),"new style public site key"),
 506  'pubkey':(listof(somepubkey),"RSA public site key",'pub'),
 507  'peer':(single_ipaddr,"Tunnel peer IP address"),
 508  'address':(address,"External contact address and port"),
 509  'mobile':(boolean,"Site is mobile"),
 510 }
 511
 512 def sp(name,value):
 513         "Simply output a property - the default case"
 514         return "%s %s;\n"%(name,value)
 515
 516 # All levels support these properties
 517 global_properties={
 518         'contact':(lambda name,value:"# Contact email address: %s\n"%(value)),
 519         'dh':sp,
 520         'hash':sp,
 521         'key-lifetime':sp,
 522         'setup-timeout':sp,
 523         'setup-retries':sp,
 524         'wait-time':sp,
 525         'renegotiate-time':sp,
 526         'restrict-nets':(lambda name,value:"# restrict-nets %s\n"%value),
 527 }
 528
 529 class level:
 530         "A level in the configuration hierarchy"
 531         depth=0
 532         leaf=0
 533         allow_properties={}
 534         require_properties={}
 535         def __init__(self,w):
 536                 self.type=w[0].keyword()
 537                 self.name=w[1].name()
 538                 self.properties={}
 539                 self.children={}
 540         def indent(self,w,t):
 541                 w.write("                 "[:t])
 542         def prop_out(self,n):
 543                 return self.allow_properties[n](n,str(self.properties[n]))
 544         def output_props(self,w,ind):
 545                 for i in sorted(self.properties.keys()):
 546                         if self.allow_properties[i]:
 547                                 self.indent(w,ind)
 548                                 w.write("%s"%self.prop_out(i))
 549         def kname(self):
 550                 return ((self.type[0].upper() if key_prefix else '')
 551                         + self.name)
 552         def output_data(self,w,path):
 553                 ind = 2*len(path)
 554                 self.indent(w,ind)
 555                 w.write("%s {\n"%(self.kname()))
 556                 self.output_props(w,ind+2)
 557                 if self.depth==1: w.write("\n");
 558                 for k in sorted(self.children.keys()):
 559                         c=self.children[k]
 560                         c.output_data(w,path+(c,))
 561                 self.indent(w,ind)
 562                 w.write("};\n")
 563
 564 class vpnlevel(level):
 565         "VPN level in the configuration hierarchy"
 566         depth=1
 567         leaf=0
 568         type="vpn"
 569         allow_properties=global_properties.copy()
 570         require_properties={
 571          'contact':"VPN admin contact address"
 572         }
 573         def __init__(self,w):
 574                 level.__init__(self,w)
 575         def output_vpnflat(self,w,path):
 576                 "Output flattened list of site names for this VPN"
 577                 ind=2*(len(path)+1)
 578                 self.indent(w,ind)
 579                 w.write("%s {\n"%(self.kname()))
 580                 for i in self.children.keys():
 581                         self.children[i].output_vpnflat(w,path+(self,))
 582                 w.write("\n")
 583                 self.indent(w,ind+2)
 584                 w.write("all-sites %s;\n"%
 585                         ','.join(map(lambda i: i.kname(),
 586                                      self.children.values())))
 587                 self.indent(w,ind)
 588                 w.write("};\n")
 589
 590 class locationlevel(level):
 591         "Location level in the configuration hierarchy"
 592         depth=2
 593         leaf=0
 594         type="location"
 595         allow_properties=global_properties.copy()
 596         require_properties={
 597          'contact':"Location admin contact address",
 598         }
 599         def __init__(self,w):
 600                 level.__init__(self,w)
 601                 self.group=w[2].groupname()
 602         def output_vpnflat(self,w,path):
 603                 ind=2*(len(path)+1)
 604                 self.indent(w,ind)
 605                 # The "path=path,self=self" abomination below exists because
 606                 # Python didn't support nested_scopes until version 2.1
 607                 #
 608                 #"/"+self.name+"/"+i
 609                 w.write("%s %s;\n"%(self.kname(),','.join(
 610                         map(lambda x,path=path,self=self:
 611                             '/'.join([prefix+"vpn-data"] + list(map(
 612                                     lambda i: i.kname(),
 613                                     path+(self,x)))),
 614                             self.children.values()))))
 615
 616 class sitelevel(level):
 617         "Site level (i.e. a leafnode) in the configuration hierarchy"
 618         depth=3
 619         leaf=1
 620         type="site"
 621         allow_properties=global_properties.copy()
 622         allow_properties.update({
 623          'address':sp,
 624          'networks':None,
 625          'peer':None,
 626          'serial':None,
 627          'pub':None,
 628          'pubkey':None,
 629          'mobile':sp,
 630         })
 631         require_properties={
 632          'dh':"Diffie-Hellman group",
 633          'contact':"Site admin contact address",
 634          'networks':"Networks claimed by the site",
 635          'hash':"hash function",
 636          'peer':"Gateway address of the site",
 637         }
 638         def mangle_name(self):
 639                 return self.name.replace('/',',')
 640         def pubkeys_path(self):
 641                 return pubkeys_dir + '/peer.' + self.mangle_name()
 642         def __init__(self,w):
 643                 level.__init__(self,w)
 644         def output_data(self,w,path):
 645                 ind=2*len(path)
 646                 np='/'.join(map(lambda i: i.name, path))
 647                 self.indent(w,ind)
 648                 w.write("%s {\n"%(self.kname()))
 649                 self.indent(w,ind+2)
 650                 w.write("name \"%s\";\n"%(np,))
 651                 self.indent(w,ind+2)
 652                 if pubkeys_install:
 653                         pa=self.pubkeys_path()
 654                         pw=open(pa+'~tmp','w')
 655                         if 'serial' in self.properties:
 656                                 pw.write('serial %s\n' %
 657                                          self.properties['serial'])
 658                         fs=FilterState()
 659                         for k in self.properties["pub"].list:
 660                                 debugrepr('pubkeys install', k)
 661                                 wout=k.forsites(max_version,None,fs)
 662                                 pw.write(' '.join(wout))
 663                                 pw.write('\n')
 664                         pw.close()
 665                         os.rename(pa+'~tmp',pa+'~update')
 666                         w.write("peer-keys \"%s\";\n"%pa);
 667                 else:
 668                         use = None
 669                         indefault = True
 670                         for k in self.properties["pub"].list:
 671                                 debugrepr('pub write', (use,indefault,k))
 672                                 if isinstance(k,pubkey):
 673                                         if indefault:
 674                                                 use = k
 675                                                 break
 676                                         if use is None:
 677                                                 use = k
 678                                 else:
 679                                         raise RuntimeError('bad '+repr(k))
 680                         if use is None:
 681                                 complain("site with no public key");
 682                         w.write("key %s;\n"%str(use))
 683                 self.output_props(w,ind+2)
 684                 self.indent(w,ind+2)
 685                 w.write("link netlink {\n");
 686                 self.indent(w,ind+4)
 687                 w.write("routes %s;\n"%str(self.properties["networks"]))
 688                 self.indent(w,ind+4)
 689                 w.write("ptp-address %s;\n"%str(self.properties["peer"]))
 690                 self.indent(w,ind+2)
 691                 w.write("};\n")
 692                 self.indent(w,ind)
 693                 w.write("};\n")
 694
 695 # Levels in the configuration file
 696 # (depth,properties)
 697 levels={'vpn':vpnlevel, 'location':locationlevel, 'site':sitelevel}
 698
 699 def complain(msg):
 700         "Complain about a particular input line"
 701         moan(("%s line %d: "%(file,line))+msg)
 702 def moan(msg):
 703         "Complain about something in general"
 704         global complaints
 705         print(msg);
 706         if complaints is None: sys.exit(1)
 707         complaints=complaints+1
 708
 709 class UntaintedRoot():
 710         def __init__(self,s): self._s=s
 711         def name(self): return self._s
 712         def keyword(self): return self._s
 713
 714 root=level([UntaintedRoot(x) for x in ['root','root']])
 715 # All vpns are children of this node
 716 obstack=[root]
 717 allow_defs=0   # Level above which new definitions are permitted
 718
 719 def set_property(obj,w):
 720         "Set a property on a configuration node"
 721         prop=w[0]
 722         propname=prop.raw_mark_ok()
 723         kw=keywords[propname]
 724         if len(kw) >= 3: propname=kw[2] # for aliases
 725         if propname in obj.properties:
 726                 obj.properties[propname].add(obj,w)
 727         else:
 728                 obj.properties[propname]=kw[0](w)
 729         return obj.properties[propname]
 730
 731 class FilterState:
 732         def __init__(self):
 733                 self.reset()
 734         def reset(self):
 735                 # called when we enter a new node,
 736                 # in particular, at the start of each site
 737                 pass
 738
 739 def pline(il,filterstate,allow_include=False):
 740         "Process a configuration file line"
 741         global allow_defs, obstack, root
 742         w=il.rstrip('\n').split()
 743         if len(w)==0: return ['']
 744         w=list([Tainted(x) for x in w])
 745         keyword=w[0]
 746         current=obstack[len(obstack)-1]
 747         copyout_core=lambda: ' '.join([ww.output() for ww in w])
 748         indent='    '*len(obstack)
 749         copyout=lambda: [indent + copyout_core() + '\n']
 750         if keyword=='end-definitions':
 751                 keyword.raw_mark_ok()
 752                 allow_defs=sitelevel.depth
 753                 obstack=[root]
 754                 return copyout()
 755         if keyword=='include':
 756                 if not allow_include:
 757                         complain("include not permitted here")
 758                         return []
 759                 if len(w) != 2:
 760                         complain("include requires one argument")
 761                         return []
 762                 newfile=os.path.join(os.path.dirname(file),w[1].raw_mark_ok())
 763                 # ^ user of "include" is trusted so raw_mark_ok is good
 764                 return pfilepath(newfile,allow_include=allow_include)
 765         if keyword.raw() in levels:
 766                 # We may go up any number of levels, but only down by one
 767                 newdepth=levels[keyword.raw_mark_ok()].depth
 768                 currentdepth=len(obstack) # actually +1...
 769                 if newdepth<=currentdepth:
 770                         obstack=obstack[:newdepth]
 771                 if newdepth>currentdepth:
 772                         complain("May not go from level %d to level %d"%
 773                                 (currentdepth-1,newdepth))
 774                 # See if it's a new one (and whether that's permitted)
 775                 # or an existing one
 776                 current=obstack[len(obstack)-1]
 777                 tname=w[1].name()
 778                 if tname in current.children:
 779                         # Not new
 780                         current=current.children[tname]
 781                         if service and group and current.depth==2:
 782                                 if group!=current.group:
 783                                         complain("Incorrect group!")
 784                                 w[2].groupname()
 785                 else:
 786                         # New
 787                         # Ignore depth check for now
 788                         nl=levels[keyword.raw()](w)
 789                         if nl.depth<allow_defs:
 790                                 complain("New definitions not allowed at "
 791                                         "level %d"%nl.depth)
 792                                 # we risk crashing if we continue
 793                                 sys.exit(1)
 794                         current.children[tname]=nl
 795                         current=nl
 796                 filterstate.reset()
 797                 obstack.append(current)
 798                 return copyout()
 799         if keyword.raw() not in current.allow_properties:
 800                 complain("Property %s not allowed at %s level"%
 801                         (keyword.raw(),current.type))
 802                 return []
 803         elif current.depth == vpnlevel.depth < allow_defs:
 804                 complain("Not allowed to set VPN properties here")
 805                 return []
 806         else:
 807                 prop=set_property(current,w)
 808                 out=[copyout_core()]
 809                 out=prop.forsites(output_version,out,filterstate)
 810                 if len(out)==0: return [indent + '#', copyout_core(), '\n']
 811                 return [indent + ' '.join(out) + '\n']
 812
 813         complain("unknown keyword '%s'"%(keyword.raw()))
 814
 815 def pfilepath(pathname,allow_include=False):
 816         f=open(pathname)
 817         outlines=pfile(pathname,f.readlines(),allow_include=allow_include)
 818         f.close()
 819         return outlines
 820
 821 def pfile(name,lines,allow_include=False):
 822         "Process a file"
 823         global file,line
 824         file=name
 825         line=0
 826         outlines=[]
 827         filterstate = FilterState()
 828         for i in lines:
 829                 line=line+1
 830                 if (i[0]=='#'): continue
 831                 outlines += pline(i,filterstate,allow_include=allow_include)
 832         return outlines
 833
 834 def outputsites(w):
 835         "Output include file for secnet configuration"
 836         w.write("# secnet sites file autogenerated by make-secnet-sites "
 837                 +"version %s\n"%VERSION)
 838         w.write("# %s\n"%time.asctime(time.localtime(time.time())))
 839         w.write("# Command line: %s\n\n"%' '.join(sys.argv))
 840
 841         # Raw VPN data section of file
 842         w.write(prefix+"vpn-data {\n")
 843         for i in root.children.values():
 844                 i.output_data(w,(i,))
 845         w.write("};\n")
 846
 847         # Per-VPN flattened lists
 848         w.write(prefix+"vpn {\n")
 849         for i in root.children.values():
 850                 i.output_vpnflat(w,())
 851         w.write("};\n")
 852
 853         # Flattened list of sites
 854         w.write(prefix+"all-sites %s;\n"%",".join(
 855                 map(lambda x:"%svpn/%s/all-sites"%(prefix,x.kname()),
 856                         root.children.values())))
 857
 858 line=0
 859 file=None
 860 complaints=0
 861
 862 # Sanity check section
 863 # Delete nodes where leaf=0 that have no children
 864
 865 def live(n):
 866         "Number of leafnodes below node n"
 867         if n.leaf: return 1
 868         for i in n.children.keys():
 869                 if live(n.children[i]): return 1
 870         return 0
 871 def delempty(n):
 872         "Delete nodes that have no leafnode children"
 873         for i in list(n.children.keys()):
 874                 delempty(n.children[i])
 875                 if not live(n.children[i]):
 876                         del n.children[i]
 877
 878 # Check that all constraints are met (as far as I can tell
 879 # restrict-nets/networks/peer are the only special cases)
 880
 881 def checkconstraints(n,p,ra):
 882         new_p=p.copy()
 883         new_p.update(n.properties)
 884         for i in n.require_properties.keys():
 885                 if i not in new_p:
 886                         moan("%s %s is missing property %s"%
 887                                 (n.type,n.name,i))
 888         for i in new_p.keys():
 889                 if i not in n.allow_properties:
 890                         moan("%s %s has forbidden property %s"%
 891                                 (n.type,n.name,i))
 892         # Check address range restrictions
 893         if "restrict-nets" in n.properties:
 894                 new_ra=ra.intersection(n.properties["restrict-nets"].set)
 895         else:
 896                 new_ra=ra
 897         if "networks" in n.properties:
 898                 if not n.properties["networks"].set <= new_ra:
 899                         moan("%s %s networks out of bounds"%(n.type,n.name))
 900                 if "peer" in n.properties:
 901                         if not n.properties["networks"].set.contains(
 902                                 n.properties["peer"].addr):
 903                                 moan("%s %s peer not in networks"%(n.type,n.name))
 904         for i in n.children.keys():
 905                 checkconstraints(n.children[i],new_p,new_ra)
 906
 907 if service:
 908         headerinput=pfilepath(header,allow_include=True)
 909         userinput=sys.stdin.readlines()
 910         pfile("user input",userinput)
 911 else:
 912         if inputfile is None:
 913                 pfile("stdin",sys.stdin.readlines())
 914         else:
 915                 pfilepath(inputfile)
 916
 917 delempty(root)
 918 checkconstraints(root,{},ipaddrset.complete_set())
 919
 920 if complaints>0:
 921         if complaints==1: print("There was 1 problem.")
 922         else: print("There were %d problems."%(complaints))
 923         sys.exit(1)
 924 complaints=None # arranges to crash if we complain later
 925
 926 if service:
 927         # Put the user's input into their group file, and rebuild the main
 928         # sites file
 929         f=open(groupfiledir+"/T"+group.groupname(),'w')
 930         f.write("# Section submitted by user %s, %s\n"%
 931                 (user,time.asctime(time.localtime(time.time()))))
 932         f.write("# Checked by make-secnet-sites version %s\n\n"%VERSION)
 933         for i in userinput: f.write(i)
 934         f.write("\n")
 935         f.close()
 936         os.rename(groupfiledir+"/T"+group.groupname(),
 937                   groupfiledir+"/R"+group.groupname())
 938         f=open(sitesfile+"-tmp",'w')
 939         f.write("# sites file autogenerated by make-secnet-sites\n")
 940         f.write("# generated %s, invoked by %s\n"%
 941                 (time.asctime(time.localtime(time.time())),user))
 942         f.write("# use make-secnet-sites to turn this file into a\n")
 943         f.write("# valid /etc/secnet/sites.conf file\n\n")
 944         for i in headerinput: f.write(i)
 945         files=os.listdir(groupfiledir)
 946         for i in files:
 947                 if i[0]=='R':
 948                         j=open(groupfiledir+"/"+i)
 949                         f.write(j.read())
 950                         j.close()
 951         f.write("# end of sites file\n")
 952         f.close()
 953         os.rename(sitesfile+"-tmp",sitesfile)
 954 else:
 955         if outputfile is None:
 956                 of=sys.stdout
 957         else:
 958                 tmp_outputfile=outputfile+'~tmp~'
 959                 of=open(tmp_outputfile,'w')
 960         outputsites(of)
 961         if outputfile is not None:
 962                 os.rename(tmp_outputfile,outputfile)