package de.blinkt.openvpn; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.HashMap; import java.util.Vector; //! Openvpn Config FIle Parser, probably not 100% accurate but close enough // And rember, this is valid :) // -- // bar // public class ConfigParser { private HashMap>> options = new HashMap>>(); public void parseConfig(InputStream inputStream) throws IOException, ConfigParseError { InputStreamReader fr = new InputStreamReader(inputStream); BufferedReader br =new BufferedReader(fr); @SuppressWarnings("unused") int lineno=0; while (true){ String line = br.readLine(); if(line==null) break; lineno++; Vector args = parseline(line); if(args.size() ==0) continue; if(args.get(0).startsWith("--")) args.set(0, args.get(0).substring(2)); checkinlinefile(args,br); String optionname = args.get(0); if(!options.containsKey(optionname)) { options.put(optionname, new Vector>()); } options.get(optionname).add(args); } } private void checkinlinefile(Vector args, BufferedReader br) throws IOException, ConfigParseError { String arg0 = args.get(0); // CHeck for if(arg0.startsWith("<") && arg0.endsWith(">")) { String argname = arg0.substring(1, arg0.length()-1); String inlinefile = VpnProfile.INLINE_TAG; String endtag = String.format("",argname); do { String line = br.readLine(); if(line==null){ throw new ConfigParseError(String.format("No endtag for starttag <%s> found",argname,argname)); } if(line.equals(endtag)) break; else { inlinefile+=line; inlinefile+= "\n"; } } while(true); args.clear(); args.add(argname); args.add(inlinefile); } } enum linestate { initial, readin_single_quote , reading_quoted, reading_unquoted, done} private boolean space(char c) { // I really hope nobody is using zero bytes inside his/her config file // to sperate parameter but here we go: return Character.isSpace(c) || c == '\0'; } public class ConfigParseError extends Exception { private static final long serialVersionUID = -60L; public ConfigParseError(String msg) { super(msg); } } // adapted openvpn's parse function to java private Vector parseline(String line) throws ConfigParseError { Vector parameters = new Vector(); if (line.length()==0) return parameters; linestate state = linestate.initial; boolean backslash = false; char out=0; int pos=0; String currentarg=""; do { // Emulate the c parsing ... char in; if(pos < line.length()) in = line.charAt(pos); else in = '\0'; if (!backslash && in == '\\' && state != linestate.readin_single_quote) { backslash = true; } else { if (state == linestate.initial) { if (!space (in)) { if (in == ';' || in == '#') /* comment */ break; if (!backslash && in == '\"') state = linestate.reading_quoted; else if (!backslash && in == '\'') state = linestate.readin_single_quote; else { out = in; state = linestate.reading_unquoted; } } } else if (state == linestate.reading_unquoted) { if (!backslash && space (in)) state = linestate.done; else out = in; } else if (state == linestate.reading_quoted) { if (!backslash && in == '\"') state = linestate.done; else out = in; } else if (state == linestate.readin_single_quote) { if (in == '\'') state = linestate.done; else out = in; } if (state == linestate.done) { /* ASSERT (parm_len > 0); */ state = linestate.initial; parameters.add(currentarg); currentarg = ""; out =0; } if (backslash && out!=0) { if (!(out == '\\' || out == '\"' || space (out))) { throw new ConfigParseError("Options warning: Bad backslash ('\\') usage"); } } backslash = false; } /* store parameter character */ if (out!=0) { currentarg+=out; } } while (pos++ < line.length()); return parameters; } final String[] unsupportedOptions = { "config", "connection", "proto-force", "remote-random", "tls-server" }; // Ignore all scripts // in most cases these won't work and user who wish to execute scripts will // figure out themselves final String[] ignoreOptions = { "tls-client", "askpass", "auth-nocache", "up", "down", "route-up", "ipchange", "route-up", "auth-user-pass-verify", "route-gateway", "topology", "persist-tun", "route-metric", "suppress-timestamps" }; // This method is far too long VpnProfile convertProfile() throws ConfigParseError{ boolean noauthtypeset=true; VpnProfile np = new VpnProfile("converted Profile"); // Pull, client, tls-client np.clearDefaults(); if(options.containsKey("client") || options.containsKey("pull")) { np.mUsePull=true; options.remove("pull"); options.remove("client"); } Vector secret = getOption("secret", 1, 2); if(secret!=null) { np.mAuthenticationType=VpnProfile.TYPE_STATICKEYS; noauthtypeset=false; np.mUseTLSAuth=true; np.mTLSAuthFilename=secret.get(1); if(secret.size()==3) np.mTLSAuthDirection=secret.get(2); } Vector> routes = getAllOption("route", 1, 4); if(routes!=null) { String routeopt = ""; for(Vector route:routes){ String netmask = "255.255.255.255"; if(route.size() >= 3) netmask = route.get(2); String net = route.get(1); try { CIDRIP cidr = new CIDRIP(net, netmask); routeopt+=cidr.toString() + " "; } catch (ArrayIndexOutOfBoundsException aioob) { throw new ConfigParseError("Could not parse netmask of route " + netmask); } } np.mCustomRoutes=routeopt; } Vector tlsauth = getOption("tls-auth", 1, 2); if(tlsauth!=null) { np.mUseTLSAuth=true; np.mTLSAuthFilename=tlsauth.get(1); if(tlsauth.size()==3) np.mTLSAuthDirection=tlsauth.get(2); } Vector direction = getOption("key-direction", 1, 1); if(direction!=null) np.mTLSAuthDirection=direction.get(1); if(getAllOption("redirect-gateway", 0, 5) != null) np.mUseDefaultRoute=true; Vector dev =getOption("dev",1,1); Vector devtype =getOption("dev-type",1,1); if( (devtype !=null && devtype.get(1).equals("tun")) || (dev!=null && dev.get(1).startsWith("tun")) || (devtype ==null && dev == null) ) { //everything okay } else { throw new ConfigParseError("Sorry. Only tun mode is supported. See the FAQ for more detail"); } Vector mode =getOption("mode",1,1); if (mode != null){ if(!mode.get(1).equals("p2p")) throw new ConfigParseError("Invalid mode for --mode specified, need p2p"); } // Parse remote config Vector remote = getOption("remote",1,3); if(remote != null){ switch (remote.size()) { case 4: String proto = remote.get(3); if(proto.equals("udp")) np.mUseUdp=true; else if (proto.equals("tcp")) np.mUseUdp=false; else throw new ConfigParseError("remote protocol must be tcp or udp"); case 3: np.mServerPort = remote.get(2); case 2: np.mServerName = remote.get(1); } } Vector port = getOption("port", 1,1); if(port!=null){ np.mServerPort = port.get(1); } Vector proto = getOption("proto", 1,1); if(proto!=null){ if(proto.get(1).equals("udp")) np.mUseUdp=true; else if (proto.get(1).equals("tcp-client") || proto.get(1).equals("tcp")) np.mUseUdp=false; else throw new ConfigParseError("Unsupported option to --proto " + proto.get(1)); } Vector> dhcpoptions = getAllOption("dhcp-option", 2, 2); if(dhcpoptions!=null) { for(Vector dhcpoption:dhcpoptions) { String type=dhcpoption.get(1); String arg = dhcpoption.get(2); if(type.equals("DOMAIN")) { np.mSearchDomain=dhcpoption.get(2); } else if(type.equals("DNS")) { np.mOverrideDNS=true; if(np.mDNS1.equals(VpnProfile.DEFAULT_DNS1)) np.mDNS1=arg; else np.mDNS2=arg; } } } Vector ifconfig = getOption("ifconfig", 2, 2); if(ifconfig!=null) { CIDRIP cidr = new CIDRIP(ifconfig.get(1), ifconfig.get(2)); np.mIPv4Address=cidr.toString(); } if(getOption("remote-random-hostname", 0, 0)!=null) np.mUseRandomHostname=true; if(getOption("float", 0, 0)!=null) np.mUseFloat=true; if(getOption("comp-lzo", 0, 1)!=null) np.mUseLzo=true; Vector cipher = getOption("cipher", 1, 1); if(cipher!=null) np.mCipher= cipher.get(1); Vector ca = getOption("ca",1,1); if(ca!=null){ np.mCaFilename = ca.get(1); } Vector cert = getOption("cert",1,1); if(cert!=null){ np.mClientCertFilename = cert.get(1); np.mAuthenticationType = VpnProfile.TYPE_CERTIFICATES; noauthtypeset=false; } Vector key= getOption("key",1,1); if(key!=null) np.mClientKeyFilename=key.get(1); Vector pkcs12 = getOption("pkcs12",1,1); if(pkcs12!=null) { np.mPKCS12Filename = pkcs12.get(1); np.mAuthenticationType = VpnProfile.TYPE_KEYSTORE; noauthtypeset=false; } Vector tlsremote = getOption("tls-remote",1,1); if(tlsremote!=null){ np.mRemoteCN = tlsremote.get(1); np.mCheckRemoteCN=true; } Vector verb = getOption("verb",1,1); if(verb!=null){ np.mVerb=verb.get(1); } if(getOption("nobind", 0, 0) != null) np.mNobind=true; if(getOption("auth-user-pass",0,1) != null) { if(noauthtypeset) { np.mAuthenticationType=VpnProfile.TYPE_USERPASS; } else if(np.mAuthenticationType==VpnProfile.TYPE_CERTIFICATES) { np.mAuthenticationType=VpnProfile.TYPE_USERPASS_CERTIFICATES; } else if(np.mAuthenticationType==VpnProfile.TYPE_KEYSTORE) { np.mAuthenticationType=VpnProfile.TYPE_USERPASS_KEYSTORE; } } // Check the other options checkIgnoreAndInvalidOptions(np); fixup(np); return np; } private void checkIgnoreAndInvalidOptions(VpnProfile np) throws ConfigParseError { for(String option:unsupportedOptions) if(options.containsKey(option)) throw new ConfigParseError(String.format("Unsupported Option %s encountered in config file. Aborting",option)); for(String option:ignoreOptions) // removing an item which is not in the map is no error options.remove(option); if(options.size()> 0) { String custom = "# These Options were found in the config file do not map to config settings:\n"; for(Vector> option:options.values()) { for(Vector optionsline: option) { for (String arg : optionsline) custom+= arg + " "; } custom+="\n"; } np.mCustomConfigOptions = custom; np.mUseCustomConfig=true; } } private void fixup(VpnProfile np) { if(np.mRemoteCN.equals(np.mServerName)) { np.mRemoteCN=""; } } private Vector getOption(String option, int minarg, int maxarg) throws ConfigParseError { Vector> alloptions = getAllOption(option, minarg, maxarg); if(alloptions==null) return null; else return alloptions.lastElement(); } private Vector> getAllOption(String option, int minarg, int maxarg) throws ConfigParseError { Vector> args = options.get(option); if(args==null) return null; for(Vector optionline:args) if(optionline.size()< (minarg+1) || optionline.size() > maxarg+1) { String err = String.format("Option %s has %d parameters, expected between %d and %d", option,args.size()-1,minarg,maxarg ); throw new ConfigParseError(err); } options.remove(option); return args; } }