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}
  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 rsakey (basetype):
 417         "An RSA public key"
 418         def __init__(self,w):
 419                 self.l=w[1].number(0,max['rsa_bits'],'rsa len')
 420                 self.e=w[2].bignum_10('rsa','rsa e')
 421                 self.n=w[3].bignum_10('rsa','rsa n')
 422                 if len(w) >= 5: w[4].email()
 423         def __str__(self):
 424                 return 'rsa-public("%s","%s")'%(self.e,self.n)
 425
 426 # Possible properties of configuration nodes
 427 keywords={
 428  'contact':(email,"Contact address"),
 429  'dh':(dhgroup,"Diffie-Hellman group"),
 430  'hash':(hash,"Hash function"),
 431  'key-lifetime':(num,"Maximum key lifetime (ms)"),
 432  'setup-timeout':(num,"Key setup timeout (ms)"),
 433  'setup-retries':(num,"Maximum key setup packet retries"),
 434  'wait-time':(num,"Time to wait after unsuccessful key setup (ms)"),
 435  'renegotiate-time':(num,"Time after key setup to begin renegotiation (ms)"),
 436  'restrict-nets':(networks,"Allowable networks"),
 437  'networks':(networks,"Claimed networks"),
 438  'pubkey':(listof(rsakey),"RSA public site key"),
 439  'peer':(single_ipaddr,"Tunnel peer IP address"),
 440  'address':(address,"External contact address and port"),
 441  'mobile':(boolean,"Site is mobile"),
 442 }
 443
 444 def sp(name,value):
 445         "Simply output a property - the default case"
 446         return "%s %s;\n"%(name,value)
 447
 448 # All levels support these properties
 449 global_properties={
 450         'contact':(lambda name,value:"# Contact email address: %s\n"%(value)),
 451         'dh':sp,
 452         'hash':sp,
 453         'key-lifetime':sp,
 454         'setup-timeout':sp,
 455         'setup-retries':sp,
 456         'wait-time':sp,
 457         'renegotiate-time':sp,
 458         'restrict-nets':(lambda name,value:"# restrict-nets %s\n"%value),
 459 }
 460
 461 class level:
 462         "A level in the configuration hierarchy"
 463         depth=0
 464         leaf=0
 465         allow_properties={}
 466         require_properties={}
 467         def __init__(self,w):
 468                 self.type=w[0].keyword()
 469                 self.name=w[1].name()
 470                 self.properties={}
 471                 self.children={}
 472         def indent(self,w,t):
 473                 w.write("                 "[:t])
 474         def prop_out(self,n):
 475                 return self.allow_properties[n](n,str(self.properties[n]))
 476         def output_props(self,w,ind):
 477                 for i in sorted(self.properties.keys()):
 478                         if self.allow_properties[i]:
 479                                 self.indent(w,ind)
 480                                 w.write("%s"%self.prop_out(i))
 481         def kname(self):
 482                 return ((self.type[0].upper() if key_prefix else '')
 483                         + self.name)
 484         def output_data(self,w,path):
 485                 ind = 2*len(path)
 486                 self.indent(w,ind)
 487                 w.write("%s {\n"%(self.kname()))
 488                 self.output_props(w,ind+2)
 489                 if self.depth==1: w.write("\n");
 490                 for k in sorted(self.children.keys()):
 491                         c=self.children[k]
 492                         c.output_data(w,path+(c,))
 493                 self.indent(w,ind)
 494                 w.write("};\n")
 495
 496 class vpnlevel(level):
 497         "VPN level in the configuration hierarchy"
 498         depth=1
 499         leaf=0
 500         type="vpn"
 501         allow_properties=global_properties.copy()
 502         require_properties={
 503          'contact':"VPN admin contact address"
 504         }
 505         def __init__(self,w):
 506                 level.__init__(self,w)
 507         def output_vpnflat(self,w,path):
 508                 "Output flattened list of site names for this VPN"
 509                 ind=2*(len(path)+1)
 510                 self.indent(w,ind)
 511                 w.write("%s {\n"%(self.kname()))
 512                 for i in self.children.keys():
 513                         self.children[i].output_vpnflat(w,path+(self,))
 514                 w.write("\n")
 515                 self.indent(w,ind+2)
 516                 w.write("all-sites %s;\n"%
 517                         ','.join(map(lambda i: i.kname(),
 518                                      self.children.values())))
 519                 self.indent(w,ind)
 520                 w.write("};\n")
 521
 522 class locationlevel(level):
 523         "Location level in the configuration hierarchy"
 524         depth=2
 525         leaf=0
 526         type="location"
 527         allow_properties=global_properties.copy()
 528         require_properties={
 529          'contact':"Location admin contact address",
 530         }
 531         def __init__(self,w):
 532                 level.__init__(self,w)
 533                 self.group=w[2].groupname()
 534         def output_vpnflat(self,w,path):
 535                 ind=2*(len(path)+1)
 536                 self.indent(w,ind)
 537                 # The "path=path,self=self" abomination below exists because
 538                 # Python didn't support nested_scopes until version 2.1
 539                 #
 540                 #"/"+self.name+"/"+i
 541                 w.write("%s %s;\n"%(self.kname(),','.join(
 542                         map(lambda x,path=path,self=self:
 543                             '/'.join([prefix+"vpn-data"] + list(map(
 544                                     lambda i: i.kname(),
 545                                     path+(self,x)))),
 546                             self.children.values()))))
 547
 548 class sitelevel(level):
 549         "Site level (i.e. a leafnode) in the configuration hierarchy"
 550         depth=3
 551         leaf=1
 552         type="site"
 553         allow_properties=global_properties.copy()
 554         allow_properties.update({
 555          'address':sp,
 556          'networks':None,
 557          'peer':None,
 558          'pubkey':None,
 559          'mobile':sp,
 560         })
 561         require_properties={
 562          'dh':"Diffie-Hellman group",
 563          'contact':"Site admin contact address",
 564          'networks':"Networks claimed by the site",
 565          'hash':"hash function",
 566          'peer':"Gateway address of the site",
 567          'pubkey':"RSA public key of the site",
 568         }
 569         def __init__(self,w):
 570                 level.__init__(self,w)
 571         def output_data(self,w,path):
 572                 ind=2*len(path)
 573                 np='/'.join(map(lambda i: i.name, path))
 574                 self.indent(w,ind)
 575                 w.write("%s {\n"%(self.kname()))
 576                 self.indent(w,ind+2)
 577                 w.write("name \"%s\";\n"%(np,))
 578                 self.indent(w,ind+2)
 579                 w.write("key %s;\n"%str(self.properties["pubkey"].list[0]))
 580                 self.output_props(w,ind+2)
 581                 self.indent(w,ind+2)
 582                 w.write("link netlink {\n");
 583                 self.indent(w,ind+4)
 584                 w.write("routes %s;\n"%str(self.properties["networks"]))
 585                 self.indent(w,ind+4)
 586                 w.write("ptp-address %s;\n"%str(self.properties["peer"]))
 587                 self.indent(w,ind+2)
 588                 w.write("};\n")
 589                 self.indent(w,ind)
 590                 w.write("};\n")
 591
 592 # Levels in the configuration file
 593 # (depth,properties)
 594 levels={'vpn':vpnlevel, 'location':locationlevel, 'site':sitelevel}
 595
 596 def complain(msg):
 597         "Complain about a particular input line"
 598         moan(("%s line %d: "%(file,line))+msg)
 599 def moan(msg):
 600         "Complain about something in general"
 601         global complaints
 602         print(msg);
 603         if complaints is None: sys.exit(1)
 604         complaints=complaints+1
 605
 606 class UntaintedRoot():
 607         def __init__(self,s): self._s=s
 608         def name(self): return self._s
 609         def keyword(self): return self._s
 610
 611 root=level([UntaintedRoot(x) for x in ['root','root']])
 612 # All vpns are children of this node
 613 obstack=[root]
 614 allow_defs=0   # Level above which new definitions are permitted
 615
 616 def set_property(obj,w):
 617         "Set a property on a configuration node"
 618         prop=w[0]
 619         propname=prop.raw_mark_ok()
 620         kw=keywords[propname]
 621         if len(kw) >= 3: propname=kw[2] # for aliases
 622         if propname in obj.properties:
 623                 obj.properties[propname].add(obj,w)
 624         else:
 625                 obj.properties[propname]=kw[0](w)
 626         return obj.properties[propname]
 627
 628 class FilterState:
 629         def __init__(self):
 630                 self.reset()
 631         def reset(self):
 632                 # called when we enter a new node,
 633                 # in particular, at the start of each site
 634                 pass
 635
 636 def pline(il,filterstate,allow_include=False):
 637         "Process a configuration file line"
 638         global allow_defs, obstack, root
 639         w=il.rstrip('\n').split()
 640         if len(w)==0: return ['']
 641         w=list([Tainted(x) for x in w])
 642         keyword=w[0]
 643         current=obstack[len(obstack)-1]
 644         copyout_core=lambda: ' '.join([ww.output() for ww in w])
 645         indent='    '*len(obstack)
 646         copyout=lambda: [indent + copyout_core() + '\n']
 647         if keyword=='end-definitions':
 648                 keyword.raw_mark_ok()
 649                 allow_defs=sitelevel.depth
 650                 obstack=[root]
 651                 return copyout()
 652         if keyword=='include':
 653                 if not allow_include:
 654                         complain("include not permitted here")
 655                         return []
 656                 if len(w) != 2:
 657                         complain("include requires one argument")
 658                         return []
 659                 newfile=os.path.join(os.path.dirname(file),w[1].raw_mark_ok())
 660                 # ^ user of "include" is trusted so raw_mark_ok is good
 661                 return pfilepath(newfile,allow_include=allow_include)
 662         if keyword.raw() in levels:
 663                 # We may go up any number of levels, but only down by one
 664                 newdepth=levels[keyword.raw_mark_ok()].depth
 665                 currentdepth=len(obstack) # actually +1...
 666                 if newdepth<=currentdepth:
 667                         obstack=obstack[:newdepth]
 668                 if newdepth>currentdepth:
 669                         complain("May not go from level %d to level %d"%
 670                                 (currentdepth-1,newdepth))
 671                 # See if it's a new one (and whether that's permitted)
 672                 # or an existing one
 673                 current=obstack[len(obstack)-1]
 674                 tname=w[1].name()
 675                 if tname in current.children:
 676                         # Not new
 677                         current=current.children[tname]
 678                         if service and group and current.depth==2:
 679                                 if group!=current.group:
 680                                         complain("Incorrect group!")
 681                                 w[2].groupname()
 682                 else:
 683                         # New
 684                         # Ignore depth check for now
 685                         nl=levels[keyword.raw()](w)
 686                         if nl.depth<allow_defs:
 687                                 complain("New definitions not allowed at "
 688                                         "level %d"%nl.depth)
 689                                 # we risk crashing if we continue
 690                                 sys.exit(1)
 691                         current.children[tname]=nl
 692                         current=nl
 693                 filterstate.reset()
 694                 obstack.append(current)
 695                 return copyout()
 696         if keyword.raw() not in current.allow_properties:
 697                 complain("Property %s not allowed at %s level"%
 698                         (keyword.raw(),current.type))
 699                 return []
 700         elif current.depth == vpnlevel.depth < allow_defs:
 701                 complain("Not allowed to set VPN properties here")
 702                 return []
 703         else:
 704                 prop=set_property(current,w)
 705                 out=[copyout_core()]
 706                 out=prop.forsites(output_version,out,filterstate)
 707                 if len(out)==0: return [indent + '#', copyout_core(), '\n']
 708                 return [indent + ' '.join(out) + '\n']
 709
 710         complain("unknown keyword '%s'"%(keyword.raw()))
 711
 712 def pfilepath(pathname,allow_include=False):
 713         f=open(pathname)
 714         outlines=pfile(pathname,f.readlines(),allow_include=allow_include)
 715         f.close()
 716         return outlines
 717
 718 def pfile(name,lines,allow_include=False):
 719         "Process a file"
 720         global file,line
 721         file=name
 722         line=0
 723         outlines=[]
 724         filterstate = FilterState()
 725         for i in lines:
 726                 line=line+1
 727                 if (i[0]=='#'): continue
 728                 outlines += pline(i,filterstate,allow_include=allow_include)
 729         return outlines
 730
 731 def outputsites(w):
 732         "Output include file for secnet configuration"
 733         w.write("# secnet sites file autogenerated by make-secnet-sites "
 734                 +"version %s\n"%VERSION)
 735         w.write("# %s\n"%time.asctime(time.localtime(time.time())))
 736         w.write("# Command line: %s\n\n"%' '.join(sys.argv))
 737
 738         # Raw VPN data section of file
 739         w.write(prefix+"vpn-data {\n")
 740         for i in root.children.values():
 741                 i.output_data(w,(i,))
 742         w.write("};\n")
 743
 744         # Per-VPN flattened lists
 745         w.write(prefix+"vpn {\n")
 746         for i in root.children.values():
 747                 i.output_vpnflat(w,())
 748         w.write("};\n")
 749
 750         # Flattened list of sites
 751         w.write(prefix+"all-sites %s;\n"%",".join(
 752                 map(lambda x:"%svpn/%s/all-sites"%(prefix,x.kname()),
 753                         root.children.values())))
 754
 755 line=0
 756 file=None
 757 complaints=0
 758
 759 # Sanity check section
 760 # Delete nodes where leaf=0 that have no children
 761
 762 def live(n):
 763         "Number of leafnodes below node n"
 764         if n.leaf: return 1
 765         for i in n.children.keys():
 766                 if live(n.children[i]): return 1
 767         return 0
 768 def delempty(n):
 769         "Delete nodes that have no leafnode children"
 770         for i in list(n.children.keys()):
 771                 delempty(n.children[i])
 772                 if not live(n.children[i]):
 773                         del n.children[i]
 774
 775 # Check that all constraints are met (as far as I can tell
 776 # restrict-nets/networks/peer are the only special cases)
 777
 778 def checkconstraints(n,p,ra):
 779         new_p=p.copy()
 780         new_p.update(n.properties)
 781         for i in n.require_properties.keys():
 782                 if i not in new_p:
 783                         moan("%s %s is missing property %s"%
 784                                 (n.type,n.name,i))
 785         for i in new_p.keys():
 786                 if i not in n.allow_properties:
 787                         moan("%s %s has forbidden property %s"%
 788                                 (n.type,n.name,i))
 789         # Check address range restrictions
 790         if "restrict-nets" in n.properties:
 791                 new_ra=ra.intersection(n.properties["restrict-nets"].set)
 792         else:
 793                 new_ra=ra
 794         if "networks" in n.properties:
 795                 if not n.properties["networks"].set <= new_ra:
 796                         moan("%s %s networks out of bounds"%(n.type,n.name))
 797                 if "peer" in n.properties:
 798                         if not n.properties["networks"].set.contains(
 799                                 n.properties["peer"].addr):
 800                                 moan("%s %s peer not in networks"%(n.type,n.name))
 801         for i in n.children.keys():
 802                 checkconstraints(n.children[i],new_p,new_ra)
 803
 804 if service:
 805         headerinput=pfilepath(header,allow_include=True)
 806         userinput=sys.stdin.readlines()
 807         pfile("user input",userinput)
 808 else:
 809         if inputfile is None:
 810                 pfile("stdin",sys.stdin.readlines())
 811         else:
 812                 pfilepath(inputfile)
 813
 814 delempty(root)
 815 checkconstraints(root,{},ipaddrset.complete_set())
 816
 817 if complaints>0:
 818         if complaints==1: print("There was 1 problem.")
 819         else: print("There were %d problems."%(complaints))
 820         sys.exit(1)
 821 complaints=None # arranges to crash if we complain later
 822
 823 if service:
 824         # Put the user's input into their group file, and rebuild the main
 825         # sites file
 826         f=open(groupfiledir+"/T"+group.groupname(),'w')
 827         f.write("# Section submitted by user %s, %s\n"%
 828                 (user,time.asctime(time.localtime(time.time()))))
 829         f.write("# Checked by make-secnet-sites version %s\n\n"%VERSION)
 830         for i in userinput: f.write(i)
 831         f.write("\n")
 832         f.close()
 833         os.rename(groupfiledir+"/T"+group.groupname(),
 834                   groupfiledir+"/R"+group.groupname())
 835         f=open(sitesfile+"-tmp",'w')
 836         f.write("# sites file autogenerated by make-secnet-sites\n")
 837         f.write("# generated %s, invoked by %s\n"%
 838                 (time.asctime(time.localtime(time.time())),user))
 839         f.write("# use make-secnet-sites to turn this file into a\n")
 840         f.write("# valid /etc/secnet/sites.conf file\n\n")
 841         for i in headerinput: f.write(i)
 842         files=os.listdir(groupfiledir)
 843         for i in files:
 844                 if i[0]=='R':
 845                         j=open(groupfiledir+"/"+i)
 846                         f.write(j.read())
 847                         j.close()
 848         f.write("# end of sites file\n")
 849         f.close()
 850         os.rename(sitesfile+"-tmp",sitesfile)
 851 else:
 852         if outputfile is None:
 853                 of=sys.stdout
 854         else:
 855                 tmp_outputfile=outputfile+'~tmp~'
 856                 of=open(tmp_outputfile,'w')
 857         outputsites(of)
 858         if outputfile is not None:
 859                 os.rename(tmp_outputfile,outputfile)