ÿØÿà JFIF    ÿÛ „  ( %"1!%)+...383,7(-.+  -+++--++++---+-+-----+---------------+---+-++7-----ÿÀ  ß â" ÿÄ     ÿÄ H    !1AQaq"‘¡2B±ÁÑð#R“Ò Tbr‚²á3csƒ’ÂñDS¢³$CÿÄ   ÿÄ %  !1AQa"23‘ÿÚ   ? ôÿ ¨pŸªáÿ —åYõõ\?àÒü©ŠÄï¨pŸªáÿ —åYõõ\?àÓü©ŠÄá 0Ÿªáÿ Ÿå[úƒ ú®ði~TÁbqÐ8OÕpÿ ƒOò¤Oè`–RÂáœá™êi€ßÉ< FtŸI“öÌ8úDf´°å}“¾œ6  öFá°y¥jñÇh†ˆ¢ã/ÃÐ:ªcÈ "Y¡ðÑl>ÿ ”ÏËte:qž\oäŠe÷󲍷˜HT4&ÿ ÓÐü6ö®¿øþßèô Ÿ•7Ñi’•j|“ñì>b…þS?*Óôÿ ÓÐü*h¥£ír¶ü UãSç‚Ÿ[AÐaè[ûª•õ&õj?†Éö+EzP—WeÒírJFt ‘BŒ†Ï‡%#tE Øz ¥OÛ«!1›üä±Í™%ºÍãö]°î(–:@<‹ŒÊö×òÆt¦ãº+‡¦%ÌÁ²h´OƒJŒtMÜ>ÀÜÊw3Y´•牋4ǍýʏTì>œú=Íwhyë,¾Ôò×õ¿ßÊa»«þˆѪQ|%6ž™A õ%:øj<>É—ÿ Å_ˆCbõ¥š±ý¯Ýƒï…¶|RëócÍf溪“t.СøTÿ *Ä¿-{†çàczůŽ_–^XþŒ±miB[X±d 1,é”zEù»& î9gœf™9Ð'.;—™i}!ôšåîqêÛ٤ёý£½ÆA–àôe"A$˝Úsäÿ ÷Û #°xŸëí(l »ý3—¥5m! rt`†0~'j2(]S¦¦kv,ÚÇ l¦øJA£Šƒ J3E8ÙiŽ:cÉžúeZ°€¯\®kÖ(79«Ž:¯X”¾³Š&¡* ….‰Ž(ÜíŸ2¥ª‡×Hi²TF¤ò[¨íÈRëÉ䢍mgÑ.Ÿ<öäS0í„ǹÁU´f#Vß;Õ–…P@3ío<ä-±»Ž.L|kªÀê›fÂ6@»eu‚|ÓaÞÆŸ…¨ááå>åŠ?cKü6ùTÍÆ”†sĤÚ;H2RÚ†õ\Ö·Ÿn'¾ ñ#ºI¤Å´%çÁ­‚â7›‹qT3Iï¨ÖÚ5I7Ë!ÅOóŸ¶øÝñØôת¦$Tcö‘[«Ö³šÒ';Aþ ¸èíg A2Z"i¸vdÄ÷.iõ®§)¿]¤À†–‡É&ä{V¶iŽ”.Ó×Õÿ û?h¬Mt–íª[ÿ Ñÿ ÌV(í}=ibÔ¡›¥¢±b Lô¥‡piη_Z<‡z§èŒ)iÖwiÇ 2hÙ3·=’d÷8éŽ1¦¸c¤µ€7›7Ø ð\á)} ¹fËí›pAÃL%âc2 í§æQz¿;T8sæ°qø)QFMð‰XŒÂ±N¢aF¨…8¯!U  Z©RÊ ÖPVÄÀÍin™Ì-GˆªÅËŠ›•zË}º±ŽÍFò¹}Uw×#ä5B¤{î}Ð<ÙD é©¤&‡ïDbàÁôMÁ." ¤‡ú*õ'VŽ|¼´Úgllº¼klz[Æüï÷Aób‡Eÿ dÑ»Xx9ÃÜ£ÁT/`¼¸vI±Ýµ·Ë‚“G³þ*Ÿû´r|*}<¨îºœ @¦mÄ’M¹”.œ«Y–|6ÏU¤jç¥ÕÞqO ˜kDÆÁ¨5ÿ š;Њ¦¦€GÙk \ –Þ=â¼=SͧµªS°ÚÍpÜãQűÀõ¬?ÃÁ1Ñ•õZà?hóœ€ L¦l{Y*K˜Ù›zc˜–ˆâ ø+¾ ­-Ök¥%ùEÜA'}ˆ><ÊIè“bpÍ/qÞâvoX€w,\úªò6Z[XdÒæ­@Ö—€$òJí#é>'°Ú ôª˜<)4ryÙ£|óAÅn5žêŸyÒäMÝ2{"}‰–¤l÷ûWX\l¾Á¸góÉOÔ /óñB¤f¸çñ[.P˜ZsÊË*ßT܈§QN¢’¡¨§V¼(Üù*eÕ“”5T¨‹Âê¥FŒã½Dü[8'Ò¥a…Ú¶k7a *•›¼'Ò·\8¨ª\@\õ¢¦íq+DÙrmÎ…_ªæ»ŠÓœ¡¯’Ré9MÅ×D™lælffc+ŒÑ,ý™ÿ ¯þǤ=Å’Á7µ÷ÚÛ/“Ü€ñýã¼àí¾ÕÑ+ƒ,uµMâÀÄbm:ÒÎPæ{˜Gz[ƒ¯«® KHà`ßØŠéí¯P8Aq.C‰ à€kòpj´kN¶qô€…Õ,ÜNŠª-­{Zö’æû44‰sŽè‰îVíRœÕm" 6?³D9¡ÇTíÅꋇ`4«¸ÝÁô ï’ýorqКÇZ«x4Žâéþuïf¹µö[P ,Q£éaX±`PÉÍZ ¸äYúg üAx ’6Lê‚xÝÓ*äQ  Ï’¨hÍ =²,6ï#rÃ<¯–£»ƒ‹,–ê•€ aÛsñ'%Æ"®ÛüìBᝠHÚ3ß°©$“XnœÖ’î2ËTeûìxîß ¦å¿çÉ ðK§þ{‘t‚Ϋ¬jéîZ[ ”š7L¥4VÚCE×]m¤Øy”ä4-dz£œ§¸x.*ãÊÊ b÷•h:©‡¦s`BTÁRû¾g⻩‹jø sF¢àJøFl‘È•Xᓁà~*j¯ +(ÚÕ6-£¯÷GŠØy‚<Ç’.F‹Hœw(+)ÜÜâÈzÄäT§FߘãÏ;DmVœ3Àu@mÚüXÝü•3B¨òÌÁÛ<·ÃÜ z,Ì@õÅ·d2]ü8s÷IôÞ¯^Ç9¢u„~ëAŸï4«M? K]­ÅàPl@s_ p:°¬ZR”´›JC[CS.h‹ƒïËœ«Æ]–÷ó‚wR×k7X‰k›‘´ù¦=¡«‰¨¨Â')—71ó’c‡Ðúµ `é.{§p¹ój\Ž{1h{o±Ý=áUÊïGÖŒõ–-BÄm+AZX¶¡ ïHðæ¥JmÙ;…ä¡Ÿˆ¦ ° äšiÉg«$üMk5¤L“’çÊvïâï ,=f“"íἊ5ô¬x6{ɏžID0e¸vçmi'︧ºð9$ò¹÷*£’9ÿ ²TÔ…×>JV¥}Œ}$p[bÔ®*[jzS*8 ”·T›Í–ñUîƒwo$áè=LT™ç—~ô·¤ÈÚ$榍q‰„+´kFm)ž‹©i–ËqÞŠ‰à¶ü( ‚•§ •°ò·‡#5ª•µÊ﯅¡X¨šÁ*F#TXJÊ ušJVÍ&=iÄs1‚3•'fý§5Ñ<=[íÞ­ PÚ;ѱÌ_~Ä££8rÞ ²w;’hDT°>ÈG¬8Á²ÚzŽ®ò®qZcqJêäÞ-ö[ܘbň±çb“Š¶31²n×iƒðÕ;1¶þÉ ªX‰,ßqÏ$>•î íZ¥Z 1{ç൵+ƒÕµ¥°T$§K]á»Ûï*·¤tMI’ÂZbŽÕiÒ˜}bÓ0£ª5›¨ [5Ž^ÝœWøÂÝh° ¢OWun£¤5 a2Z.G2³YL]jåtì”ä ÁÓ‘%"©<ÔúÊ°sº UZvä‡ÄiÆÒM .÷V·™ø#kèýiíÌ–ª)µT[)BˆõÑ xB¾B€ÖT¨.¥~ð@VĶr#¸ü*åZNDŽH;âi ],©£öØpù(šºãö¼T.uCê•4@ÿ GÕÛ)Cx›®0ø#:ÏðFÒbR\(€€Ä®fã4Þ‰Fä¯HXƒÅ,†öEÑÔÜ]Öv²?tLÃvBY£ú6Êu5ÅAQ³1‘’¬x–HŒÐ‡ ^ ¸KwJôÖŽ5×CÚ¨vÜ«/B0$×k°=ðbÇ(Ï)w±A†Á† 11Í=èQšµ626ŒÜ/`G«µ<}—-Ö7KEHÈÉðóȤmݱû±·ø«Snmá=“ä«šmݱŸ¡¶~ó·“äUóJæúòB|E LêŽy´jDÔ$G¢þÐñ7óR8ýÒ…Ç› WVe#·Ÿ p·Fx~•ݤF÷0Èÿ K¯æS<6’¡WШ; ´ÿ ¥Êø\Òuî†åÝ–VNœkÒ7oòX¨Á­Ø÷FÎÑä±g÷ÿ M~Çî=p,X´ ÝÌÚÅ‹’ÃjÖ.ØöÏñ qïQ¤ÓZE†° =6·]܈ s¸>v•Ž^Ý\wq9r‰Î\¸¡kURÒ$­*‹Nq?Þª*!sŠÆ:TU_u±T+øX¡ ®¹¡,ÄâÃBTsÜ$Ø›4m椴zÜK]’’›Pƒ @€#â˜`é¹=I‡fiV•Ôî“nRm+µFPOhÍ0B£ €+¬5c v•:P'ÒyÎ ‰V~‚Ó†ÖuókDoh$å\*ö%Ю=£«…aȼ½÷Û.-½VŒŠ¼'lyî±1¬3ó#ÞE¿ÔS¤gV£m›=§\û"—WU¤ÚǼÿ ÂnÁGŒÃ ‚õN D³õNÚíŒÕ;HôyÄÈ©P¹Ä{:?R‘Ô¨âF÷ø£bÅó® JS|‚R÷ivýáâ€Æé¡è³´IئÑT!§˜•Øª‚¬â@q€wnïCWÄ@JU€ê¯m6]Ï:£âx'+ÒðXvÓ¦Úm=–´7œ $ì“B£~p%ÕŸUþ« N@¼üï~w˜ñø5®—'Ôe»¤5ã//€ž~‰Tþ›Å7•#¤× Íö pÄ$ùeåì*«ÓŠEØWEÈsßg ¦ûvžSsLpºÊW–âµEWöˬH; ™!CYõZ ÃÄf æ#1W. \uWâ\,\Çf j’<qTbên›Î[vxx£ë 'ö¨1›˜ÀM¼Pÿ H)ƒêêŒA7s,|F“ 꺸k³9Ìö*ç®;Ö!Ö$Eiž•¹ÒÚ†ýóéÝû¾ÕS®ó$’NÝäŸz¤5r¦ãÄÃD÷Üø!°ø‡Ô&@m™Ì^Ãä­d q5Lnÿ N;.6½·N|#ä"1Nƒx“ã<3('&ñßt  ~ªu”1Tb㫨9ê–›–bìd$ߣ=#ÕãÒmU¯eí$EFù5ýYô櫨æ왍Ǘ±ssM]·á¿0ÕåJRÓªîiƒ+O58ÖñªŠÒx" \µâá¨i’¤i —Ö ” M+M¤ë9‚‰A¦°Qõ¾ßøK~¼Ã‘g…Ö´~÷Ï[3GUœÒ½#…kàÔ®Ò”‰³·dWV‰IP‰Ú8u¹”E ÖqLj¾êÕCBš{A^Âß;–¨`¯¬ìö ˼ ×tìø.tƐm*n¨y4o&Àx¥n¦×î‡aupáÛj8¿m›è¶ã!o½;ß0y^ý×^EÑ¿ÒjzŒ­)vÚÑnÄL …^ªô× ‡—‚3k Îý­hï]içå–îÏ*÷ñþ»Ô CÒjøjÍznˆ´ ¹#b'Fô‹ ‰v¥'’à'T´ƒHýÍ%M‰ ƒ&ÆÇŒï1 ‘ –Þ ‰i¬s žR-Ÿ kŠ¬á¬7:þ 0ŒÅÒÕ/aÙ¬ÃÝ#Úøœ ©aiVc‰. ¹¦ãµ” ›Yg¦›ÆÎýº°f³7ƒhá·¸­}&D9¡ÂsÉÙÞèŠõØàC™¨ñbFC|´Ü(ŸƒÚÒ-%»'a Ì¿)ËÇn¿úÿ ÞŽX…4ÊÅH^ôΑí@ù¹Eh¶“L8Çjù ¼ÎåVªóR©Ï5uà V4lZß®=€xÖŸ–ÑÈ ÷”¨°¾__yM1tÉ?uÆþIkÄgæ@þ[¢†°XÃJ£j·:nkÅ¢u ‘}âGzö­/IµèŠ¬¼48q¦F°ŽR¼=ûì{´¯RýicS ÕÛ íNtÍÙï£,w4rêì®»~x(©Uñ§#Ñ&œÕ¤>ÎåÍÓ9’Ö{9eV­[Öjâ²ãu]˜å2›qÑšÕJç0€sÄ|Êëè0튔bÁ>“{×_F`Ø©ºê:µä,v¤ðfc1±"«ÔÍän1#=· Âøv~H½ÐßA¾¿Ü€Óš]Õ; I¾÷ç‚Qi†î¹9ywÔKG˜áñ zQY—§ÃÕZ07§X‚ Áh;ÁM)iÌCH-¯T‘ë|A0{Ò½LÚ–TâÖkÜ’dÀ“rmm»”جPF³ÖcbE§T€ÒxKºû’Ó®7±²(\4ŽÃ¸Uu@j™yĵ;³µ!Á¢b.W¤=mõ´êµK k ¸K^ÜÛ#p*Ü14qkZç5ïë †°5Ï%ÍÛ<Õ¤×Ô¥ê†C Õ´¼ú$ƒÖ“”]Ù¬qÞÚ[4©ý!ûÏ—Áb쳐XµA¬â~`›Çr¸8ìùÝ䫦<>ä÷«?xs´ÇÑ /á;¹øüÊÈÙà{"@Žïzâ¬[âß‚ U_<ÇŸ½4èN˜ú61®qŠu ¦þF£»äJ_ˆÙÎ~ ÞAã–Ý„Ï—rŠD;xTž‘ô`É«…suãO`?³à™ô Lý#Íc5öoæØ‚y´´÷«ZR§<&JÇ+éâô´€i!Àˆ0æAoàðLèÖ-2ŸõW.’t^–(KÁmHµV@xÜÇy®Ñø­â^:Ú3w· 7½¹°ñ¸â¹®:',«Mœ—n­Á+Ãbš LÈ‘ÄnRÓÅœ%¦²‰¨ùQ:¤f‚ "PÕtô¸…cæl…&˜Ú˜Ôkv‹ž+vŠ,=¢v­6—Xy*¥t£«<™:“aîϲ=¦6rO]XI¿Œ÷¤zÚ­›¶ 6÷”w\d ü~v®ˆÌk«^m<ÿ ¢‰Õ\)ùºŽ;… lîÙÅEŠ®cѾ@vnMÏ,¼“ñ•ŽBxðÃzãÇç%3ˆ"}Ù•Åî> BÉú;Ò]V+P˜F_´ßé> Øše|ï‡ÄOmFæÇ ãqÞ$/xÐx­z`ï9"œÜij‚!7.\Td…9M‡•iŽ‹¾‘50ÞŽn¥ß4ÉôO ¹*í^QêËÜÇÌ8=Ž§s‰'ÂëÙ«á%Pú[O †ÅP¯VsŽ°.‰,kc¶ ¬A9n˜XÎ-ÞšN["¹QÕ‰ƒMýÁߺXJæÍaLj¾×Ãmã¾ãÚ uñÒþåQô¦¥ /ÄUx:‚ÍÜ’ Đ©ØÝ3V¨‰ÕnÐ6ó*óúK­«…c ¯U òhsý­jóÔj#,ímŒRµ«lbïUTŒÑ8†Ä0œÏr`ð¡¬É Ї ë"À² ™ 6¥ f¶ ¢ÚoܱԷ-<Àî)†a¶ž'Ú»¨TXqØæ¶÷YÄHy˜9ÈIW­YÀuMFë ºÏ’AqÌ4·/Ú †ô'i$øä­=Ä Ý|öK×40è|È6p‘0§)o¥ctî§H+CA-“ xØ|ÐXŠç l8íºð3Ø:³¤¬KX¯UÿÙ # -*- coding: utf-8 -*- # # Copyright (C) 2015-2016 Red Hat, Inc. # # Authors: # Thomas Woerner # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # """The ipset command wrapper""" __all__ = [ "ipset", "check_ipset_name", "remove_default_create_options" ] import os.path import ipaddress from firewall import errors from firewall.errors import FirewallError from firewall.core.prog import runProg from firewall.core.logger import log from firewall.functions import tempFile, readfile from firewall.config import COMMANDS IPSET_MAXNAMELEN = 32 IPSET_TYPES = [ # bitmap and set types are currently not supported # "bitmap:ip", # "bitmap:ip,mac", # "bitmap:port", # "list:set", "hash:ip", "hash:ip,port", "hash:ip,port,ip", "hash:ip,port,net", "hash:ip,mark", "hash:net", "hash:net,net", "hash:net,port", "hash:net,port,net", "hash:net,iface", "hash:mac", ] IPSET_CREATE_OPTIONS = { "family": "inet|inet6", "hashsize": "value", "maxelem": "value", "timeout": "value in secs", #"counters": None, #"comment": None, } IPSET_DEFAULT_CREATE_OPTIONS = { "family": "inet", "hashsize": "1024", "maxelem": "65536", } class ipset(object): """ipset command wrapper class""" def __init__(self): self._command = COMMANDS["ipset"] self.name = "ipset" def __run(self, args): """Call ipset with args""" # convert to string list _args = ["%s" % item for item in args] log.debug2("%s: %s %s", self.__class__, self._command, " ".join(_args)) (status, ret) = runProg(self._command, _args) if status != 0: raise ValueError("'%s %s' failed: %s" % (self._command, " ".join(_args), ret)) return ret def check_name(self, name): """Check ipset name""" if len(name) > IPSET_MAXNAMELEN: raise FirewallError(errors.INVALID_NAME, "ipset name '%s' is not valid" % name) def set_supported_types(self): """Return types that are supported by the ipset command and kernel""" ret = [ ] output = "" try: output = self.__run(["--help"]) except ValueError as ex: log.debug1("ipset error: %s" % ex) lines = output.splitlines() in_types = False for line in lines: #print(line) if in_types: splits = line.strip().split(None, 2) if splits[0] not in ret and splits[0] in IPSET_TYPES: ret.append(splits[0]) if line.startswith("Supported set types:"): in_types = True return ret def check_type(self, type_name): """Check ipset type""" if len(type_name) > IPSET_MAXNAMELEN or type_name not in IPSET_TYPES: raise FirewallError(errors.INVALID_TYPE, "ipset type name '%s' is not valid" % type_name) def set_create(self, set_name, type_name, options=None): """Create an ipset with name, type and options""" self.check_name(set_name) self.check_type(type_name) args = [ "create", set_name, type_name ] if isinstance(options, dict): for key, val in options.items(): args.append(key) if val != "": args.append(val) return self.__run(args) def set_destroy(self, set_name): self.check_name(set_name) return self.__run([ "destroy", set_name ]) def set_add(self, set_name, entry): args = [ "add", set_name, entry ] return self.__run(args) def set_delete(self, set_name, entry): args = [ "del", set_name, entry ] return self.__run(args) def test(self, set_name, entry, options=None): args = [ "test", set_name, entry ] if options: args.append("%s" % " ".join(options)) return self.__run(args) def set_list(self, set_name=None, options=None): args = [ "list" ] if set_name: args.append(set_name) if options: args.extend(options) return self.__run(args).split("\n") def set_get_active_terse(self): """ Get active ipsets (only headers) """ lines = self.set_list(options=["-terse"]) ret = { } _name = _type = None _options = { } for line in lines: if len(line) < 1: continue pair = [ x.strip() for x in line.split(":", 1) ] if len(pair) != 2: continue elif pair[0] == "Name": _name = pair[1] elif pair[0] == "Type": _type = pair[1] elif pair[0] == "Header": splits = pair[1].split() i = 0 while i < len(splits): opt = splits[i] if opt in [ "family", "hashsize", "maxelem", "timeout", "netmask" ]: if len(splits) > i: i += 1 _options[opt] = splits[i] else: log.error("Malformed ipset list -terse output: %s", line) return { } i += 1 if _name and _type: ret[_name] = (_type, remove_default_create_options(_options)) _name = _type = None _options.clear() return ret def save(self, set_name=None): args = [ "save" ] if set_name: args.append(set_name) return self.__run(args) def set_restore(self, set_name, type_name, entries, create_options=None, entry_options=None): self.check_name(set_name) self.check_type(type_name) temp_file = tempFile() if ' ' in set_name: set_name = "'%s'" % set_name args = [ "create", set_name, type_name, "-exist" ] if create_options: for key, val in create_options.items(): args.append(key) if val != "": args.append(val) temp_file.write("%s\n" % " ".join(args)) temp_file.write("flush %s\n" % set_name) for entry in entries: if ' ' in entry: entry = "'%s'" % entry if entry_options: temp_file.write("add %s %s %s\n" % \ (set_name, entry, " ".join(entry_options))) else: temp_file.write("add %s %s\n" % (set_name, entry)) temp_file.close() stat = os.stat(temp_file.name) log.debug2("%s: %s restore %s", self.__class__, self._command, "%s: %d" % (temp_file.name, stat.st_size)) args = [ "restore" ] (status, ret) = runProg(self._command, args, stdin=temp_file.name) if log.getDebugLogLevel() > 2: try: readfile(temp_file.name) except Exception: pass else: i = 1 for line in readfile(temp_file.name): log.debug3("%8d: %s" % (i, line), nofmt=1, nl=0) if not line.endswith("\n"): log.debug3("", nofmt=1) i += 1 os.unlink(temp_file.name) if status != 0: raise ValueError("'%s %s' failed: %s" % (self._command, " ".join(args), ret)) return ret def set_flush(self, set_name): args = [ "flush" ] if set_name: args.append(set_name) return self.__run(args) def rename(self, old_set_name, new_set_name): return self.__run([ "rename", old_set_name, new_set_name ]) def swap(self, set_name_1, set_name_2): return self.__run([ "swap", set_name_1, set_name_2 ]) def version(self): return self.__run([ "version" ]) def check_ipset_name(name): """Return true if ipset name is valid""" if len(name) > IPSET_MAXNAMELEN: return False return True def remove_default_create_options(options): """ Return only non default create options """ _options = options.copy() for opt in IPSET_DEFAULT_CREATE_OPTIONS: if opt in _options and \ IPSET_DEFAULT_CREATE_OPTIONS[opt] == _options[opt]: del _options[opt] return _options def normalize_ipset_entry(entry): """ Normalize IP addresses in entry """ _entry = [] for _part in entry.split(","): try: _part.index("/") _entry.append(str(ipaddress.ip_network(_part, strict=False))) except ValueError: _entry.append(_part) return ",".join(_entry) def check_entry_overlaps_existing(entry, entries): """ Check if entry overlaps any entry in the list of entries """ # Only check simple types if len(entry.split(",")) > 1: return try: entry_network = ipaddress.ip_network(entry, strict=False) except ValueError: # could not parse the new IP address, maybe a MAC return for itr in entries: if entry_network.overlaps(ipaddress.ip_network(itr, strict=False)): raise FirewallError(errors.INVALID_ENTRY, "Entry '{}' overlaps with existing entry '{}'".format(entry, itr)) def check_for_overlapping_entries(entries): """ Check if any entry overlaps any entry in the list of entries """ try: entries = [ipaddress.ip_network(x, strict=False) for x in entries] except ValueError: # at least one entry can not be parsed return if len(entries) == 0: return # We can take advantage of some facts of IPv4Network/IPv6Network and # how Python sorts the networks to quickly detect overlaps. # # Facts: # # 1. IPv{4,6}Network are normalized to remove host bits, e.g. # 10.1.1.0/16 will become 10.1.0.0/16. # # 2. IPv{4,6}Network objects are sorted by: # a. IP address (network bits) # then # b. netmask (significant bits count) # # Because of the above we have these properties: # # 1. big networks (netA) are sorted before smaller networks (netB) # that overlap the big network (netA) # - e.g. 10.1.128.0/17 (netA) sorts before 10.1.129.0/24 (netB) # 2. same value addresses (network bits) are grouped together even # if the number of network bits vary. e.g. /16 vs /24 # - recall that address are normalized to remove host bits # - e.g. 10.1.128.0/17 (netA) sorts before 10.1.128.0/24 (netC) # 3. non-overlapping networks (netD, netE) are always sorted before or # after networks that overlap (netB, netC) the current one (netA) # - e.g. 10.1.128.0/17 (netA) sorts before 10.2.128.0/16 (netD) # - e.g. 10.1.128.0/17 (netA) sorts after 9.1.128.0/17 (netE) # - e.g. 9.1.128.0/17 (netE) sorts before 10.1.129.0/24 (netB) # # With this we know the sorted list looks like: # # list: [ netE, netA, netB, netC, netD ] # # netE = non-overlapping network # netA = big network # netB = smaller network that overlaps netA (subnet) # netC = smaller network that overlaps netA (subnet) # netD = non-overlapping network # # If networks netB and netC exist in the list, they overlap and are # adjacent to netA. # # Checking for overlaps on a sorted list is thus: # # 1. compare adjacent elements in the list for overlaps # # Recall that we only need to detect a single overlap. We do not need to # detect them all. # entries.sort() prev_network = entries.pop(0) for current_network in entries: if prev_network.overlaps(current_network): raise FirewallError(errors.INVALID_ENTRY, "Entry '{}' overlaps entry '{}'".format(prev_network, current_network)) prev_network = current_network