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 = 1
  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
 257         ap = argparse.ArgumentParser(description='process secnet sites files')
 258         ap.add_argument('--userv', '-u', action='store_true',
 259                         help='userv service fragment update mode')
 260         ap.add_argument('--conf-key-prefix', action=ActionNoYes,
 261                         default=True,
 262                  help='prefix conf file key names derived from sites data')
 263         ap.add_argument('--output-version', nargs=1, type=int,
 264                         help='sites file output version',
 265                         default=[max_version])
 266         ap.add_argument('--prefix', '-P', nargs=1,
 267                         help='set prefix')
 268         ap.add_argument('--debug', '-D', action='count', default=0)
 269         ap.add_argument('arg',nargs=argparse.REMAINDER)
 270         av = ap.parse_args()
 271         debug_level = av.debug
 272         debugrepr('av',av)
 273         service = 1 if av.userv else 0
 274         prefix = '' if av.prefix is None else av.prefix[0]
 275         key_prefix = av.conf_key_prefix
 276         output_version = av.output_version[0]
 277         if service:
 278                 if len(av.arg)!=4:
 279                         print("Wrong number of arguments")
 280                         sys.exit(1)
 281                 (header, groupfiledir, sitesfile, group) = av.arg
 282                 group = Tainted(group,0,'command line')
 283                 # untrusted argument from caller
 284                 if "USERV_USER" not in os.environ:
 285                         print("Environment variable USERV_USER not found")
 286                         sys.exit(1)
 287                 user=os.environ["USERV_USER"]
 288                 # Check that group is in USERV_GROUP
 289                 if "USERV_GROUP" not in os.environ:
 290                         print("Environment variable USERV_GROUP not found")
 291                         sys.exit(1)
 292                 ugs=os.environ["USERV_GROUP"]
 293                 ok=0
 294                 for i in ugs.split():
 295                         if group==i: ok=1
 296                 if not ok:
 297                         print("caller not in group %s"%group)
 298                         sys.exit(1)
 299         else:
 300                 if len(av.arg)>3:
 301                         print("Too many arguments")
 302                         sys.exit(1)
 303                 (inputfile, outputfile) = (av.arg + [None]*2)[0:2]
 304
 305 parse_args()
 306
 307 # Classes describing possible datatypes in the configuration file
 308
 309 class basetype:
 310         "Common protocol for configuration types."
 311         def add(self,obj,w):
 312                 complain("%s %s already has property %s defined"%
 313                         (obj.type,obj.name,w[0].raw()))
 314         def forsites(self,version,copy,fs):
 315                 return copy
 316
 317 class conflist:
 318         "A list of some kind of configuration type."
 319         def __init__(self,subtype,w):
 320                 self.subtype=subtype
 321                 self.list=[subtype(w)]
 322         def add(self,obj,w):
 323                 self.list.append(self.subtype(w))
 324         def __str__(self):
 325                 return ', '.join(map(str, self.list))
 326         def forsites(self,version,copy,fs):
 327                 most_recent=self.list[len(self.list)-1]
 328                 return most_recent.forsites(version,copy,fs)
 329 def listof(subtype):
 330         return lambda w: conflist(subtype, w)
 331
 332 class single_ipaddr (basetype):
 333         "An IP address"
 334         def __init__(self,w):
 335                 self.addr=ipaddress.ip_address(w[1].raw_mark_ok())
 336         def __str__(self):
 337                 return '"%s"'%self.addr
 338
 339 class networks (basetype):
 340         "A set of IP addresses specified as a list of networks"
 341         def __init__(self,w):
 342                 self.set=ipaddrset.IPAddressSet()
 343                 for i in w[1:]:
 344                         x=ipaddress.ip_network(i.raw_mark_ok(),strict=True)
 345                         self.set.append([x])
 346         def __str__(self):
 347                 return ",".join(map((lambda n: '"%s"'%n), self.set.networks()))
 348
 349 class dhgroup (basetype):
 350         "A Diffie-Hellman group"
 351         def __init__(self,w):
 352                 self.mod=w[1].bignum_16('dh','dh mod')
 353                 self.gen=w[2].bignum_16('dh','dh gen')
 354         def __str__(self):
 355                 return 'diffie-hellman("%s","%s")'%(self.mod,self.gen)
 356
 357 class hash (basetype):
 358         "A choice of hash function"
 359         def __init__(self,w):
 360                 hname=w[1]
 361                 self.ht=hname.raw()
 362                 if (self.ht!='md5' and self.ht!='sha1'):
 363                         complain("unknown hash type %s"%(self.ht))
 364                         self.ht=None
 365                 else:
 366                         hname.raw_mark_ok()
 367         def __str__(self):
 368                 return '%s'%(self.ht)
 369
 370 class email (basetype):
 371         "An email address"
 372         def __init__(self,w):
 373                 self.addr=w[1].email()
 374         def __str__(self):
 375                 return '<%s>'%(self.addr)
 376
 377 class boolean (basetype):
 378         "A boolean"
 379         def __init__(self,w):
 380                 v=w[1]
 381                 if re.match('[TtYy1]',v.raw()):
 382                         self.b=True
 383                         v.raw_mark_ok()
 384                 elif re.match('[FfNn0]',v.raw()):
 385                         self.b=False
 386                         v.raw_mark_ok()
 387                 else:
 388                         complain("invalid boolean value");
 389         def __str__(self):
 390                 return ['False','True'][self.b]
 391
 392 class num (basetype):
 393         "A decimal number"
 394         def __init__(self,w):
 395                 self.n=w[1].number(0,0x7fffffff)
 396         def __str__(self):
 397                 return '%d'%(self.n)
 398
 399 class serial (basetype):
 400         def __init__(self,w):
 401                 self.i=w[1].hexid(4,'serial')
 402         def __str__(self):
 403                 return self.i
 404         def forsites(self,version,copy,fs):
 405                 if version < 2: return []
 406                 return copy
 407
 408 class address (basetype):
 409         "A DNS name and UDP port number"
 410         def __init__(self,w):
 411                 self.adr=w[1].host()
 412                 self.port=w[2].number(1,65536,'port')
 413         def __str__(self):
 414                 return '"%s"; port %d'%(self.adr,self.port)
 415
 416 class pubkey (basetype):
 417         "Some kind of publie key"
 418         def __init__(self,w):
 419                 self.a=w[1].name('algname')
 420                 self.d=w[2].base91();
 421         def __str__(self):
 422                 return 'make-public("%s","%s")'%(self.a,self.d)
 423
 424 class rsakey (pubkey):
 425         "An RSA public key"
 426         def __init__(self,w):
 427                 self.l=w[1].number(0,max['rsa_bits'],'rsa len')
 428                 self.e=w[2].bignum_10('rsa','rsa e')
 429                 self.n=w[3].bignum_10('rsa','rsa n')
 430                 if len(w) >= 5: w[4].email()
 431         def __str__(self):
 432                 return 'rsa-public("%s","%s")'%(self.e,self.n)
 433                 # this specialisation means we can generate files
 434                 # compatible with old secnet executables
 435
 436 def somepubkey(w):
 437         if w[0]=='pubkey':
 438                 return rsakey(w)
 439         elif w[0]=='pub':
 440                 return pubkey(w)
 441         else:
 442                 assert(False)
 443
 444 # Possible properties of configuration nodes
 445 keywords={
 446  'contact':(email,"Contact address"),
 447  'dh':(dhgroup,"Diffie-Hellman group"),
 448  'hash':(hash,"Hash function"),
 449  'key-lifetime':(num,"Maximum key lifetime (ms)"),
 450  'setup-timeout':(num,"Key setup timeout (ms)"),
 451  'setup-retries':(num,"Maximum key setup packet retries"),
 452  'wait-time':(num,"Time to wait after unsuccessful key setup (ms)"),
 453  'renegotiate-time':(num,"Time after key setup to begin renegotiation (ms)"),
 454  'restrict-nets':(networks,"Allowable networks"),
 455  'networks':(networks,"Claimed networks"),
 456  'pub':(listof(somepubkey),"new style public site key",'pubkey'),
 457  'pubkey':(listof(somepubkey),"RSA public site key"),
 458  'peer':(single_ipaddr,"Tunnel peer IP address"),
 459  'address':(address,"External contact address and port"),
 460  'mobile':(boolean,"Site is mobile"),
 461 }
 462
 463 def sp(name,value):
 464         "Simply output a property - the default case"
 465         return "%s %s;\n"%(name,value)
 466
 467 # All levels support these properties
 468 global_properties={
 469         'contact':(lambda name,value:"# Contact email address: %s\n"%(value)),
 470         'dh':sp,
 471         'hash':sp,
 472         'key-lifetime':sp,
 473         'setup-timeout':sp,
 474         'setup-retries':sp,
 475         'wait-time':sp,
 476         'renegotiate-time':sp,
 477         'restrict-nets':(lambda name,value:"# restrict-nets %s\n"%value),
 478 }
 479
 480 class level:
 481         "A level in the configuration hierarchy"
 482         depth=0
 483         leaf=0
 484         allow_properties={}
 485         require_properties={}
 486         def __init__(self,w):
 487                 self.type=w[0].keyword()
 488                 self.name=w[1].name()
 489                 self.properties={}
 490                 self.children={}
 491         def indent(self,w,t):
 492                 w.write("                 "[:t])
 493         def prop_out(self,n):
 494                 return self.allow_properties[n](n,str(self.properties[n]))
 495         def output_props(self,w,ind):
 496                 for i in sorted(self.properties.keys()):
 497                         if self.allow_properties[i]:
 498                                 self.indent(w,ind)
 499                                 w.write("%s"%self.prop_out(i))
 500         def kname(self):
 501                 return ((self.type[0].upper() if key_prefix else '')
 502                         + self.name)
 503         def output_data(self,w,path):
 504                 ind = 2*len(path)
 505                 self.indent(w,ind)
 506                 w.write("%s {\n"%(self.kname()))
 507                 self.output_props(w,ind+2)
 508                 if self.depth==1: w.write("\n");
 509                 for k in sorted(self.children.keys()):
 510                         c=self.children[k]
 511                         c.output_data(w,path+(c,))
 512                 self.indent(w,ind)
 513                 w.write("};\n")
 514
 515 class vpnlevel(level):
 516         "VPN level in the configuration hierarchy"
 517         depth=1
 518         leaf=0
 519         type="vpn"
 520         allow_properties=global_properties.copy()
 521         require_properties={
 522          'contact':"VPN admin contact address"
 523         }
 524         def __init__(self,w):
 525                 level.__init__(self,w)
 526         def output_vpnflat(self,w,path):
 527                 "Output flattened list of site names for this VPN"
 528                 ind=2*(len(path)+1)
 529                 self.indent(w,ind)
 530                 w.write("%s {\n"%(self.kname()))
 531                 for i in self.children.keys():
 532                         self.children[i].output_vpnflat(w,path+(self,))
 533                 w.write("\n")
 534                 self.indent(w,ind+2)
 535                 w.write("all-sites %s;\n"%
 536                         ','.join(map(lambda i: i.kname(),
 537                                      self.children.values())))
 538                 self.indent(w,ind)
 539                 w.write("};\n")
 540
 541 class locationlevel(level):
 542         "Location level in the configuration hierarchy"
 543         depth=2
 544         leaf=0
 545         type="location"
 546         allow_properties=global_properties.copy()
 547         require_properties={
 548          'contact':"Location admin contact address",
 549         }
 550         def __init__(self,w):
 551                 level.__init__(self,w)
 552                 self.group=w[2].groupname()
 553         def output_vpnflat(self,w,path):
 554                 ind=2*(len(path)+1)
 555                 self.indent(w,ind)
 556                 # The "path=path,self=self" abomination below exists because
 557                 # Python didn't support nested_scopes until version 2.1
 558                 #
 559                 #"/"+self.name+"/"+i
 560                 w.write("%s %s;\n"%(self.kname(),','.join(
 561                         map(lambda x,path=path,self=self:
 562                             '/'.join([prefix+"vpn-data"] + list(map(
 563                                     lambda i: i.kname(),
 564                                     path+(self,x)))),
 565                             self.children.values()))))
 566
 567 class sitelevel(level):
 568         "Site level (i.e. a leafnode) in the configuration hierarchy"
 569         depth=3
 570         leaf=1
 571         type="site"
 572         allow_properties=global_properties.copy()
 573         allow_properties.update({
 574          'address':sp,
 575          'networks':None,
 576          'peer':None,
 577          'pub':None,
 578          'pubkey':None,
 579          'mobile':sp,
 580         })
 581         require_properties={
 582          'dh':"Diffie-Hellman group",
 583          'contact':"Site admin contact address",
 584          'networks':"Networks claimed by the site",
 585          'hash':"hash function",
 586          'peer':"Gateway address of the site",
 587          'pubkey':"RSA public key of the site",
 588         }
 589         def __init__(self,w):
 590                 level.__init__(self,w)
 591         def output_data(self,w,path):
 592                 ind=2*len(path)
 593                 np='/'.join(map(lambda i: i.name, path))
 594                 self.indent(w,ind)
 595                 w.write("%s {\n"%(self.kname()))
 596                 self.indent(w,ind+2)
 597                 w.write("name \"%s\";\n"%(np,))
 598                 self.indent(w,ind+2)
 599                 w.write("key %s;\n"%str(self.properties["pubkey"].list[0]))
 600                 self.output_props(w,ind+2)
 601                 self.indent(w,ind+2)
 602                 w.write("link netlink {\n");
 603                 self.indent(w,ind+4)
 604                 w.write("routes %s;\n"%str(self.properties["networks"]))
 605                 self.indent(w,ind+4)
 606                 w.write("ptp-address %s;\n"%str(self.properties["peer"]))
 607                 self.indent(w,ind+2)
 608                 w.write("};\n")
 609                 self.indent(w,ind)
 610                 w.write("};\n")
 611
 612 # Levels in the configuration file
 613 # (depth,properties)
 614 levels={'vpn':vpnlevel, 'location':locationlevel, 'site':sitelevel}
 615
 616 def complain(msg):
 617         "Complain about a particular input line"
 618         moan(("%s line %d: "%(file,line))+msg)
 619 def moan(msg):
 620         "Complain about something in general"
 621         global complaints
 622         print(msg);
 623         if complaints is None: sys.exit(1)
 624         complaints=complaints+1
 625
 626 class UntaintedRoot():
 627         def __init__(self,s): self._s=s
 628         def name(self): return self._s
 629         def keyword(self): return self._s
 630
 631 root=level([UntaintedRoot(x) for x in ['root','root']])
 632 # All vpns are children of this node
 633 obstack=[root]
 634 allow_defs=0   # Level above which new definitions are permitted
 635
 636 def set_property(obj,w):
 637         "Set a property on a configuration node"
 638         prop=w[0]
 639         propname=prop.raw_mark_ok()
 640         kw=keywords[propname]
 641         if len(kw) >= 3: propname=kw[2] # for aliases
 642         if propname in obj.properties:
 643                 obj.properties[propname].add(obj,w)
 644         else:
 645                 obj.properties[propname]=kw[0](w)
 646         return obj.properties[propname]
 647
 648 class FilterState:
 649         def __init__(self):
 650                 self.reset()
 651         def reset(self):
 652                 # called when we enter a new node,
 653                 # in particular, at the start of each site
 654                 pass
 655
 656 def pline(il,filterstate,allow_include=False):
 657         "Process a configuration file line"
 658         global allow_defs, obstack, root
 659         w=il.rstrip('\n').split()
 660         if len(w)==0: return ['']
 661         w=list([Tainted(x) for x in w])
 662         keyword=w[0]
 663         current=obstack[len(obstack)-1]
 664         copyout_core=lambda: ' '.join([ww.output() for ww in w])
 665         indent='    '*len(obstack)
 666         copyout=lambda: [indent + copyout_core() + '\n']
 667         if keyword=='end-definitions':
 668                 keyword.raw_mark_ok()
 669                 allow_defs=sitelevel.depth
 670                 obstack=[root]
 671                 return copyout()
 672         if keyword=='include':
 673                 if not allow_include:
 674                         complain("include not permitted here")
 675                         return []
 676                 if len(w) != 2:
 677                         complain("include requires one argument")
 678                         return []
 679                 newfile=os.path.join(os.path.dirname(file),w[1].raw_mark_ok())
 680                 # ^ user of "include" is trusted so raw_mark_ok is good
 681                 return pfilepath(newfile,allow_include=allow_include)
 682         if keyword.raw() in levels:
 683                 # We may go up any number of levels, but only down by one
 684                 newdepth=levels[keyword.raw_mark_ok()].depth
 685                 currentdepth=len(obstack) # actually +1...
 686                 if newdepth<=currentdepth:
 687                         obstack=obstack[:newdepth]
 688                 if newdepth>currentdepth:
 689                         complain("May not go from level %d to level %d"%
 690                                 (currentdepth-1,newdepth))
 691                 # See if it's a new one (and whether that's permitted)
 692                 # or an existing one
 693                 current=obstack[len(obstack)-1]
 694                 tname=w[1].name()
 695                 if tname in current.children:
 696                         # Not new
 697                         current=current.children[tname]
 698                         if service and group and current.depth==2:
 699                                 if group!=current.group:
 700                                         complain("Incorrect group!")
 701                                 w[2].groupname()
 702                 else:
 703                         # New
 704                         # Ignore depth check for now
 705                         nl=levels[keyword.raw()](w)
 706                         if nl.depth<allow_defs:
 707                                 complain("New definitions not allowed at "
 708                                         "level %d"%nl.depth)
 709                                 # we risk crashing if we continue
 710                                 sys.exit(1)
 711                         current.children[tname]=nl
 712                         current=nl
 713                 filterstate.reset()
 714                 obstack.append(current)
 715                 return copyout()
 716         if keyword.raw() not in current.allow_properties:
 717                 complain("Property %s not allowed at %s level"%
 718                         (keyword.raw(),current.type))
 719                 return []
 720         elif current.depth == vpnlevel.depth < allow_defs:
 721                 complain("Not allowed to set VPN properties here")
 722                 return []
 723         else:
 724                 prop=set_property(current,w)
 725                 out=[copyout_core()]
 726                 out=prop.forsites(output_version,out,filterstate)
 727                 if len(out)==0: return [indent + '#', copyout_core(), '\n']
 728                 return [indent + ' '.join(out) + '\n']
 729
 730         complain("unknown keyword '%s'"%(keyword.raw()))
 731
 732 def pfilepath(pathname,allow_include=False):
 733         f=open(pathname)
 734         outlines=pfile(pathname,f.readlines(),allow_include=allow_include)
 735         f.close()
 736         return outlines
 737
 738 def pfile(name,lines,allow_include=False):
 739         "Process a file"
 740         global file,line
 741         file=name
 742         line=0
 743         outlines=[]
 744         filterstate = FilterState()
 745         for i in lines:
 746                 line=line+1
 747                 if (i[0]=='#'): continue
 748                 outlines += pline(i,filterstate,allow_include=allow_include)
 749         return outlines
 750
 751 def outputsites(w):
 752         "Output include file for secnet configuration"
 753         w.write("# secnet sites file autogenerated by make-secnet-sites "
 754                 +"version %s\n"%VERSION)
 755         w.write("# %s\n"%time.asctime(time.localtime(time.time())))
 756         w.write("# Command line: %s\n\n"%' '.join(sys.argv))
 757
 758         # Raw VPN data section of file
 759         w.write(prefix+"vpn-data {\n")
 760         for i in root.children.values():
 761                 i.output_data(w,(i,))
 762         w.write("};\n")
 763
 764         # Per-VPN flattened lists
 765         w.write(prefix+"vpn {\n")
 766         for i in root.children.values():
 767                 i.output_vpnflat(w,())
 768         w.write("};\n")
 769
 770         # Flattened list of sites
 771         w.write(prefix+"all-sites %s;\n"%",".join(
 772                 map(lambda x:"%svpn/%s/all-sites"%(prefix,x.kname()),
 773                         root.children.values())))
 774
 775 line=0
 776 file=None
 777 complaints=0
 778
 779 # Sanity check section
 780 # Delete nodes where leaf=0 that have no children
 781
 782 def live(n):
 783         "Number of leafnodes below node n"
 784         if n.leaf: return 1
 785         for i in n.children.keys():
 786                 if live(n.children[i]): return 1
 787         return 0
 788 def delempty(n):
 789         "Delete nodes that have no leafnode children"
 790         for i in list(n.children.keys()):
 791                 delempty(n.children[i])
 792                 if not live(n.children[i]):
 793                         del n.children[i]
 794
 795 # Check that all constraints are met (as far as I can tell
 796 # restrict-nets/networks/peer are the only special cases)
 797
 798 def checkconstraints(n,p,ra):
 799         new_p=p.copy()
 800         new_p.update(n.properties)
 801         for i in n.require_properties.keys():
 802                 if i not in new_p:
 803                         moan("%s %s is missing property %s"%
 804                                 (n.type,n.name,i))
 805         for i in new_p.keys():
 806                 if i not in n.allow_properties:
 807                         moan("%s %s has forbidden property %s"%
 808                                 (n.type,n.name,i))
 809         # Check address range restrictions
 810         if "restrict-nets" in n.properties:
 811                 new_ra=ra.intersection(n.properties["restrict-nets"].set)
 812         else:
 813                 new_ra=ra
 814         if "networks" in n.properties:
 815                 if not n.properties["networks"].set <= new_ra:
 816                         moan("%s %s networks out of bounds"%(n.type,n.name))
 817                 if "peer" in n.properties:
 818                         if not n.properties["networks"].set.contains(
 819                                 n.properties["peer"].addr):
 820                                 moan("%s %s peer not in networks"%(n.type,n.name))
 821         for i in n.children.keys():
 822                 checkconstraints(n.children[i],new_p,new_ra)
 823
 824 if service:
 825         headerinput=pfilepath(header,allow_include=True)
 826         userinput=sys.stdin.readlines()
 827         pfile("user input",userinput)
 828 else:
 829         if inputfile is None:
 830                 pfile("stdin",sys.stdin.readlines())
 831         else:
 832                 pfilepath(inputfile)
 833
 834 delempty(root)
 835 checkconstraints(root,{},ipaddrset.complete_set())
 836
 837 if complaints>0:
 838         if complaints==1: print("There was 1 problem.")
 839         else: print("There were %d problems."%(complaints))
 840         sys.exit(1)
 841 complaints=None # arranges to crash if we complain later
 842
 843 if service:
 844         # Put the user's input into their group file, and rebuild the main
 845         # sites file
 846         f=open(groupfiledir+"/T"+group.groupname(),'w')
 847         f.write("# Section submitted by user %s, %s\n"%
 848                 (user,time.asctime(time.localtime(time.time()))))
 849         f.write("# Checked by make-secnet-sites version %s\n\n"%VERSION)
 850         for i in userinput: f.write(i)
 851         f.write("\n")
 852         f.close()
 853         os.rename(groupfiledir+"/T"+group.groupname(),
 854                   groupfiledir+"/R"+group.groupname())
 855         f=open(sitesfile+"-tmp",'w')
 856         f.write("# sites file autogenerated by make-secnet-sites\n")
 857         f.write("# generated %s, invoked by %s\n"%
 858                 (time.asctime(time.localtime(time.time())),user))
 859         f.write("# use make-secnet-sites to turn this file into a\n")
 860         f.write("# valid /etc/secnet/sites.conf file\n\n")
 861         for i in headerinput: f.write(i)
 862         files=os.listdir(groupfiledir)
 863         for i in files:
 864                 if i[0]=='R':
 865                         j=open(groupfiledir+"/"+i)
 866                         f.write(j.read())
 867                         j.close()
 868         f.write("# end of sites file\n")
 869         f.close()
 870         os.rename(sitesfile+"-tmp",sitesfile)
 871 else:
 872         if outputfile is None:
 873                 of=sys.stdout
 874         else:
 875                 tmp_outputfile=outputfile+'~tmp~'
 876                 of=open(tmp_outputfile,'w')
 877         outputsites(of)
 878         if outputfile is not None:
 879                 os.rename(tmp_outputfile,outputfile)