summaryrefslogtreecommitdiff
path: root/src/de/blinkt/openvpn/ConfigParser.java
blob: 8fde12b88c8f99436b3aa041800dbc4403cbf207 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
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.Map.Entry;
import java.util.Vector;

//! Openvpn Config FIle Parser, probably not 100% accurate but close enough

// And rember, this is valid :)
// --<foo>
// bar
// </foo>
public class ConfigParser {


	private HashMap<String,Vector<String>> options = new HashMap<String, Vector<String>>();
	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<String> args = parseline(line);
			if(args.size() ==0)
				continue;



			if(args.get(0).startsWith("--"))
				args.set(0, args.get(0).substring(2));

			checkinlinefile(args,br);

			options.put(args.get(0), args);
		}
	}

	private void checkinlinefile(Vector<String> args, BufferedReader br) throws IOException, ConfigParseError {
		String arg0 = args.get(0);
		// CHeck for <foo>
		if(arg0.startsWith("<") && arg0.endsWith(">")) {
			String argname = arg0.substring(1, arg0.length()-1);
			String inlinefile = VpnProfile.INLINE_TAG;

			String endtag = String.format("</%s>",argname);
			do {
				String line = br.readLine();
				if(line==null){
					throw new ConfigParseError(String.format("No endtag </%s> 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<String> parseline(String line) throws ConfigParseError {
		Vector<String> parameters = new Vector<String>(); 

		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"
	};
	// Missing
	// proto tcp-client|udp

	VpnProfile convertProfile() throws ConfigParseError{
		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<String> secret = getOption("secret", 1, 2);
		if(secret!=null) 
		{
			np.mAuthenticationType=VpnProfile.TYPE_STATICKEYS;
			np.mUseTLSAuth=true;
			np.mTLSAuthFilename=secret.get(1);
			if(secret.size()==3)
				np.mTLSAuthDirection=secret.get(2);
		}

		Vector<String> 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<String> direction = getOption("key-direction", 1, 1);
		if(direction!=null)
			np.mTLSAuthDirection=direction.get(1);

		if(options.containsKey("redirect-gateway")) {
			options.remove("redirect-gateway");
			np.mUseDefaultRoute=true;
		} else {
			np.mUseDefaultRoute=true;
		}

		Vector<String> dev =getOption("dev",1,1);
		Vector<String> 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<String> 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<String> 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<String> 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"))
				np.mUseUdp=false;
			else 
				throw new ConfigParseError("Unsupported option to --proto " + proto.get(1));
					
		}
		
		Vector<String> dhcpoption = getOption("dhcp-options", 1, 3);
		if(dhcpoption!=null) {
			String type=dhcpoption.get(1);

		}
		
		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<String> cipher = getOption("cipher", 1, 1);
		if(cipher!=null)
			np.mCipher= cipher.get(1);

		Vector<String> ca = getOption("ca",1,1);
		if(ca!=null){
			np.mCaFilename = ca.get(1);
		}

		Vector<String> cert = getOption("cert",1,1);
		if(cert!=null){
			np.mClientCertFilename = cert.get(1);
			np.mAuthenticationType = VpnProfile.TYPE_CERTIFICATES;
		}
		Vector<String> key= getOption("key",1,1);
		if(key!=null)
			np.mClientKeyFilename=key.get(1);

		Vector<String> pkcs12 = getOption("pkcs12",1,1);
		if(pkcs12!=null) {
			np.mPKCS12Filename = pkcs12.get(1);
			np.mAuthenticationType = VpnProfile.TYPE_KEYSTORE;
		}

		Vector<String> tlsremote = getOption("tls-remote",1,1);
		if(tlsremote!=null){
			np.mRemoteCN = tlsremote.get(1);
			np.mCheckRemoteCN=true;
		} 
		
		Vector<String> verb = getOption("verb",1,1);
		if(verb!=null){
			np.mVerb=verb.get(1);
		}

		// Check the other options

		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 but not parsed:\n";
			for(Entry<String, Vector<String>> option:options.entrySet()) {
				for (String arg : option.getValue()) {
					custom+= arg + " ";
				}
				custom+="\n";
			}
			np.mCustomConfigOptions = custom;
			np.mUseCustomConfig=true;

		}


		fixup(np);

		return np;
	}

	private void fixup(VpnProfile np) {
		if(np.mRemoteCN.equals(np.mServerName)) {
			np.mRemoteCN="";
		}
	}

	private Vector<String> getOption(String option, int minarg, int maxarg) throws ConfigParseError {
		Vector<String> args = options.get(option);
		if(args==null)
			return null;
		if(args.size()< (minarg+1) || args.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;
	}

}