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
 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         def forsites(self,version,xcopy,fs):
 424                 if version < 2: return []
 425                 return ['pub', self.a, self.d]
 426
 427 class rsakey (pubkey):
 428         "An RSA public key"
 429         def __init__(self,w):
 430                 self.l=w[1].number(0,max['rsa_bits'],'rsa len')
 431                 self.e=w[2].bignum_10('rsa','rsa e')
 432                 self.n=w[3].bignum_10('rsa','rsa n')
 433                 if len(w) >= 5: w[4].email()
 434                 self.a='rsa1'
 435                 self.d=base91s_encode(b'%d %s %s' %
 436                                       (self.l,
 437                                        self.e.encode('ascii'),
 438                                        self.n.encode('ascii')))
 439                 # ^ this allows us to use the pubkey.forsites()
 440                 # method for output in versions>=2
 441         def __str__(self):
 442                 return 'rsa-public("%s","%s")'%(self.e,self.n)
 443                 # this specialisation means we can generate files
 444                 # compatible with old secnet executables
 445         def forsites(self,version,xcopy,fs):
 446                 if version < 2:
 447                         return ['pubkey', str(self.l), self.e, self.n]
 448                 return pubkey.forsites(self,version,xcopy,fs)
 449
 450 def somepubkey(w):
 451         if w[0]=='pubkey':
 452                 return rsakey(w)
 453         elif w[0]=='pub':
 454                 return pubkey(w)
 455         else:
 456                 assert(False)
 457
 458 # Possible properties of configuration nodes
 459 keywords={
 460  'contact':(email,"Contact address"),
 461  'dh':(dhgroup,"Diffie-Hellman group"),
 462  'hash':(hash,"Hash function"),
 463  'key-lifetime':(num,"Maximum key lifetime (ms)"),
 464  'setup-timeout':(num,"Key setup timeout (ms)"),
 465  'setup-retries':(num,"Maximum key setup packet retries"),
 466  'wait-time':(num,"Time to wait after unsuccessful key setup (ms)"),
 467  'renegotiate-time':(num,"Time after key setup to begin renegotiation (ms)"),
 468  'restrict-nets':(networks,"Allowable networks"),
 469  'networks':(networks,"Claimed networks"),
 470  'pub':(listof(somepubkey),"new style public site key"),
 471  'pubkey':(listof(somepubkey),"RSA public site key",'pub'),
 472  'peer':(single_ipaddr,"Tunnel peer IP address"),
 473  'address':(address,"External contact address and port"),
 474  'mobile':(boolean,"Site is mobile"),
 475 }
 476
 477 def sp(name,value):
 478         "Simply output a property - the default case"
 479         return "%s %s;\n"%(name,value)
 480
 481 # All levels support these properties
 482 global_properties={
 483         'contact':(lambda name,value:"# Contact email address: %s\n"%(value)),
 484         'dh':sp,
 485         'hash':sp,
 486         'key-lifetime':sp,
 487         'setup-timeout':sp,
 488         'setup-retries':sp,
 489         'wait-time':sp,
 490         'renegotiate-time':sp,
 491         'restrict-nets':(lambda name,value:"# restrict-nets %s\n"%value),
 492 }
 493
 494 class level:
 495         "A level in the configuration hierarchy"
 496         depth=0
 497         leaf=0
 498         allow_properties={}
 499         require_properties={}
 500         def __init__(self,w):
 501                 self.type=w[0].keyword()
 502                 self.name=w[1].name()
 503                 self.properties={}
 504                 self.children={}
 505         def indent(self,w,t):
 506                 w.write("                 "[:t])
 507         def prop_out(self,n):
 508                 return self.allow_properties[n](n,str(self.properties[n]))
 509         def output_props(self,w,ind):
 510                 for i in sorted(self.properties.keys()):
 511                         if self.allow_properties[i]:
 512                                 self.indent(w,ind)
 513                                 w.write("%s"%self.prop_out(i))
 514         def kname(self):
 515                 return ((self.type[0].upper() if key_prefix else '')
 516                         + self.name)
 517         def output_data(self,w,path):
 518                 ind = 2*len(path)
 519                 self.indent(w,ind)
 520                 w.write("%s {\n"%(self.kname()))
 521                 self.output_props(w,ind+2)
 522                 if self.depth==1: w.write("\n");
 523                 for k in sorted(self.children.keys()):
 524                         c=self.children[k]
 525                         c.output_data(w,path+(c,))
 526                 self.indent(w,ind)
 527                 w.write("};\n")
 528
 529 class vpnlevel(level):
 530         "VPN level in the configuration hierarchy"
 531         depth=1
 532         leaf=0
 533         type="vpn"
 534         allow_properties=global_properties.copy()
 535         require_properties={
 536          'contact':"VPN admin contact address"
 537         }
 538         def __init__(self,w):
 539                 level.__init__(self,w)
 540         def output_vpnflat(self,w,path):
 541                 "Output flattened list of site names for this VPN"
 542                 ind=2*(len(path)+1)
 543                 self.indent(w,ind)
 544                 w.write("%s {\n"%(self.kname()))
 545                 for i in self.children.keys():
 546                         self.children[i].output_vpnflat(w,path+(self,))
 547                 w.write("\n")
 548                 self.indent(w,ind+2)
 549                 w.write("all-sites %s;\n"%
 550                         ','.join(map(lambda i: i.kname(),
 551                                      self.children.values())))
 552                 self.indent(w,ind)
 553                 w.write("};\n")
 554
 555 class locationlevel(level):
 556         "Location level in the configuration hierarchy"
 557         depth=2
 558         leaf=0
 559         type="location"
 560         allow_properties=global_properties.copy()
 561         require_properties={
 562          'contact':"Location admin contact address",
 563         }
 564         def __init__(self,w):
 565                 level.__init__(self,w)
 566                 self.group=w[2].groupname()
 567         def output_vpnflat(self,w,path):
 568                 ind=2*(len(path)+1)
 569                 self.indent(w,ind)
 570                 # The "path=path,self=self" abomination below exists because
 571                 # Python didn't support nested_scopes until version 2.1
 572                 #
 573                 #"/"+self.name+"/"+i
 574                 w.write("%s %s;\n"%(self.kname(),','.join(
 575                         map(lambda x,path=path,self=self:
 576                             '/'.join([prefix+"vpn-data"] + list(map(
 577                                     lambda i: i.kname(),
 578                                     path+(self,x)))),
 579                             self.children.values()))))
 580
 581 class sitelevel(level):
 582         "Site level (i.e. a leafnode) in the configuration hierarchy"
 583         depth=3
 584         leaf=1
 585         type="site"
 586         allow_properties=global_properties.copy()
 587         allow_properties.update({
 588          'address':sp,
 589          'networks':None,
 590          'peer':None,
 591          'pub':None,
 592          'pubkey':None,
 593          'mobile':sp,
 594         })
 595         require_properties={
 596          'dh':"Diffie-Hellman group",
 597          'contact':"Site admin contact address",
 598          'networks':"Networks claimed by the site",
 599          'hash':"hash function",
 600          'peer':"Gateway address of the site",
 601          'pub':"public key of the site",
 602         }
 603         def __init__(self,w):
 604                 level.__init__(self,w)
 605         def output_data(self,w,path):
 606                 ind=2*len(path)
 607                 np='/'.join(map(lambda i: i.name, path))
 608                 self.indent(w,ind)
 609                 w.write("%s {\n"%(self.kname()))
 610                 self.indent(w,ind+2)
 611                 w.write("name \"%s\";\n"%(np,))
 612                 self.indent(w,ind+2)
 613                 w.write("key %s;\n"%str(self.properties["pub"].list[0]))
 614                 self.output_props(w,ind+2)
 615                 self.indent(w,ind+2)
 616                 w.write("link netlink {\n");
 617                 self.indent(w,ind+4)
 618                 w.write("routes %s;\n"%str(self.properties["networks"]))
 619                 self.indent(w,ind+4)
 620                 w.write("ptp-address %s;\n"%str(self.properties["peer"]))
 621                 self.indent(w,ind+2)
 622                 w.write("};\n")
 623                 self.indent(w,ind)
 624                 w.write("};\n")
 625
 626 # Levels in the configuration file
 627 # (depth,properties)
 628 levels={'vpn':vpnlevel, 'location':locationlevel, 'site':sitelevel}
 629
 630 def complain(msg):
 631         "Complain about a particular input line"
 632         moan(("%s line %d: "%(file,line))+msg)
 633 def moan(msg):
 634         "Complain about something in general"
 635         global complaints
 636         print(msg);
 637         if complaints is None: sys.exit(1)
 638         complaints=complaints+1
 639
 640 class UntaintedRoot():
 641         def __init__(self,s): self._s=s
 642         def name(self): return self._s
 643         def keyword(self): return self._s
 644
 645 root=level([UntaintedRoot(x) for x in ['root','root']])
 646 # All vpns are children of this node
 647 obstack=[root]
 648 allow_defs=0   # Level above which new definitions are permitted
 649
 650 def set_property(obj,w):
 651         "Set a property on a configuration node"
 652         prop=w[0]
 653         propname=prop.raw_mark_ok()
 654         kw=keywords[propname]
 655         if len(kw) >= 3: propname=kw[2] # for aliases
 656         if propname in obj.properties:
 657                 obj.properties[propname].add(obj,w)
 658         else:
 659                 obj.properties[propname]=kw[0](w)
 660         return obj.properties[propname]
 661
 662 class FilterState:
 663         def __init__(self):
 664                 self.reset()
 665         def reset(self):
 666                 # called when we enter a new node,
 667                 # in particular, at the start of each site
 668                 pass
 669
 670 def pline(il,filterstate,allow_include=False):
 671         "Process a configuration file line"
 672         global allow_defs, obstack, root
 673         w=il.rstrip('\n').split()
 674         if len(w)==0: return ['']
 675         w=list([Tainted(x) for x in w])
 676         keyword=w[0]
 677         current=obstack[len(obstack)-1]
 678         copyout_core=lambda: ' '.join([ww.output() for ww in w])
 679         indent='    '*len(obstack)
 680         copyout=lambda: [indent + copyout_core() + '\n']
 681         if keyword=='end-definitions':
 682                 keyword.raw_mark_ok()
 683                 allow_defs=sitelevel.depth
 684                 obstack=[root]
 685                 return copyout()
 686         if keyword=='include':
 687                 if not allow_include:
 688                         complain("include not permitted here")
 689                         return []
 690                 if len(w) != 2:
 691                         complain("include requires one argument")
 692                         return []
 693                 newfile=os.path.join(os.path.dirname(file),w[1].raw_mark_ok())
 694                 # ^ user of "include" is trusted so raw_mark_ok is good
 695                 return pfilepath(newfile,allow_include=allow_include)
 696         if keyword.raw() in levels:
 697                 # We may go up any number of levels, but only down by one
 698                 newdepth=levels[keyword.raw_mark_ok()].depth
 699                 currentdepth=len(obstack) # actually +1...
 700                 if newdepth<=currentdepth:
 701                         obstack=obstack[:newdepth]
 702                 if newdepth>currentdepth:
 703                         complain("May not go from level %d to level %d"%
 704                                 (currentdepth-1,newdepth))
 705                 # See if it's a new one (and whether that's permitted)
 706                 # or an existing one
 707                 current=obstack[len(obstack)-1]
 708                 tname=w[1].name()
 709                 if tname in current.children:
 710                         # Not new
 711                         current=current.children[tname]
 712                         if service and group and current.depth==2:
 713                                 if group!=current.group:
 714                                         complain("Incorrect group!")
 715                                 w[2].groupname()
 716                 else:
 717                         # New
 718                         # Ignore depth check for now
 719                         nl=levels[keyword.raw()](w)
 720                         if nl.depth<allow_defs:
 721                                 complain("New definitions not allowed at "
 722                                         "level %d"%nl.depth)
 723                                 # we risk crashing if we continue
 724                                 sys.exit(1)
 725                         current.children[tname]=nl
 726                         current=nl
 727                 filterstate.reset()
 728                 obstack.append(current)
 729                 return copyout()
 730         if keyword.raw() not in current.allow_properties:
 731                 complain("Property %s not allowed at %s level"%
 732                         (keyword.raw(),current.type))
 733                 return []
 734         elif current.depth == vpnlevel.depth < allow_defs:
 735                 complain("Not allowed to set VPN properties here")
 736                 return []
 737         else:
 738                 prop=set_property(current,w)
 739                 out=[copyout_core()]
 740                 out=prop.forsites(output_version,out,filterstate)
 741                 if len(out)==0: return [indent + '#', copyout_core(), '\n']
 742                 return [indent + ' '.join(out) + '\n']
 743
 744         complain("unknown keyword '%s'"%(keyword.raw()))
 745
 746 def pfilepath(pathname,allow_include=False):
 747         f=open(pathname)
 748         outlines=pfile(pathname,f.readlines(),allow_include=allow_include)
 749         f.close()
 750         return outlines
 751
 752 def pfile(name,lines,allow_include=False):
 753         "Process a file"
 754         global file,line
 755         file=name
 756         line=0
 757         outlines=[]
 758         filterstate = FilterState()
 759         for i in lines:
 760                 line=line+1
 761                 if (i[0]=='#'): continue
 762                 outlines += pline(i,filterstate,allow_include=allow_include)
 763         return outlines
 764
 765 def outputsites(w):
 766         "Output include file for secnet configuration"
 767         w.write("# secnet sites file autogenerated by make-secnet-sites "
 768                 +"version %s\n"%VERSION)
 769         w.write("# %s\n"%time.asctime(time.localtime(time.time())))
 770         w.write("# Command line: %s\n\n"%' '.join(sys.argv))
 771
 772         # Raw VPN data section of file
 773         w.write(prefix+"vpn-data {\n")
 774         for i in root.children.values():
 775                 i.output_data(w,(i,))
 776         w.write("};\n")
 777
 778         # Per-VPN flattened lists
 779         w.write(prefix+"vpn {\n")
 780         for i in root.children.values():
 781                 i.output_vpnflat(w,())
 782         w.write("};\n")
 783
 784         # Flattened list of sites
 785         w.write(prefix+"all-sites %s;\n"%",".join(
 786                 map(lambda x:"%svpn/%s/all-sites"%(prefix,x.kname()),
 787                         root.children.values())))
 788
 789 line=0
 790 file=None
 791 complaints=0
 792
 793 # Sanity check section
 794 # Delete nodes where leaf=0 that have no children
 795
 796 def live(n):
 797         "Number of leafnodes below node n"
 798         if n.leaf: return 1
 799         for i in n.children.keys():
 800                 if live(n.children[i]): return 1
 801         return 0
 802 def delempty(n):
 803         "Delete nodes that have no leafnode children"
 804         for i in list(n.children.keys()):
 805                 delempty(n.children[i])
 806                 if not live(n.children[i]):
 807                         del n.children[i]
 808
 809 # Check that all constraints are met (as far as I can tell
 810 # restrict-nets/networks/peer are the only special cases)
 811
 812 def checkconstraints(n,p,ra):
 813         new_p=p.copy()
 814         new_p.update(n.properties)
 815         for i in n.require_properties.keys():
 816                 if i not in new_p:
 817                         moan("%s %s is missing property %s"%
 818                                 (n.type,n.name,i))
 819         for i in new_p.keys():
 820                 if i not in n.allow_properties:
 821                         moan("%s %s has forbidden property %s"%
 822                                 (n.type,n.name,i))
 823         # Check address range restrictions
 824         if "restrict-nets" in n.properties:
 825                 new_ra=ra.intersection(n.properties["restrict-nets"].set)
 826         else:
 827                 new_ra=ra
 828         if "networks" in n.properties:
 829                 if not n.properties["networks"].set <= new_ra:
 830                         moan("%s %s networks out of bounds"%(n.type,n.name))
 831                 if "peer" in n.properties:
 832                         if not n.properties["networks"].set.contains(
 833                                 n.properties["peer"].addr):
 834                                 moan("%s %s peer not in networks"%(n.type,n.name))
 835         for i in n.children.keys():
 836                 checkconstraints(n.children[i],new_p,new_ra)
 837
 838 if service:
 839         headerinput=pfilepath(header,allow_include=True)
 840         userinput=sys.stdin.readlines()
 841         pfile("user input",userinput)
 842 else:
 843         if inputfile is None:
 844                 pfile("stdin",sys.stdin.readlines())
 845         else:
 846                 pfilepath(inputfile)
 847
 848 delempty(root)
 849 checkconstraints(root,{},ipaddrset.complete_set())
 850
 851 if complaints>0:
 852         if complaints==1: print("There was 1 problem.")
 853         else: print("There were %d problems."%(complaints))
 854         sys.exit(1)
 855 complaints=None # arranges to crash if we complain later
 856
 857 if service:
 858         # Put the user's input into their group file, and rebuild the main
 859         # sites file
 860         f=open(groupfiledir+"/T"+group.groupname(),'w')
 861         f.write("# Section submitted by user %s, %s\n"%
 862                 (user,time.asctime(time.localtime(time.time()))))
 863         f.write("# Checked by make-secnet-sites version %s\n\n"%VERSION)
 864         for i in userinput: f.write(i)
 865         f.write("\n")
 866         f.close()
 867         os.rename(groupfiledir+"/T"+group.groupname(),
 868                   groupfiledir+"/R"+group.groupname())
 869         f=open(sitesfile+"-tmp",'w')
 870         f.write("# sites file autogenerated by make-secnet-sites\n")
 871         f.write("# generated %s, invoked by %s\n"%
 872                 (time.asctime(time.localtime(time.time())),user))
 873         f.write("# use make-secnet-sites to turn this file into a\n")
 874         f.write("# valid /etc/secnet/sites.conf file\n\n")
 875         for i in headerinput: f.write(i)
 876         files=os.listdir(groupfiledir)
 877         for i in files:
 878                 if i[0]=='R':
 879                         j=open(groupfiledir+"/"+i)
 880                         f.write(j.read())
 881                         j.close()
 882         f.write("# end of sites file\n")
 883         f.close()
 884         os.rename(sitesfile+"-tmp",sitesfile)
 885 else:
 886         if outputfile is None:
 887                 of=sys.stdout
 888         else:
 889                 tmp_outputfile=outputfile+'~tmp~'
 890                 of=open(tmp_outputfile,'w')
 891         outputsites(of)
 892         if outputfile is not None:
 893                 os.rename(tmp_outputfile,outputfile)