make-secnet-sites

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