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