| 4 |
|
//---IMPORTS--- |
| 5 |
|
import uk.org.iscream.cms.server.util.*; |
| 6 |
|
import java.util.ArrayList; |
| 7 |
+ |
import java.util.StringTokenizer; |
| 8 |
|
import java.net.InetAddress; |
| 9 |
+ |
import java.io.Serializable; |
| 10 |
|
|
| 11 |
|
/** |
| 12 |
|
* Access Control List for use primarily |
| 19 |
|
* @author $Author$ |
| 20 |
|
* @version $Id$ |
| 21 |
|
*/ |
| 22 |
< |
public class ACL { |
| 22 |
> |
public class ACL implements Serializable { |
| 23 |
|
|
| 24 |
|
//---FINAL ATTRIBUTES--- |
| 25 |
|
|
| 76 |
|
* param expression what this rule matches using wildcards |
| 77 |
|
*/ |
| 78 |
|
public void add(boolean allow, String expression) { |
| 79 |
< |
_acl.add(new ACLRule(allow, expression)); |
| 79 |
> |
// default to expecting it to be an IP |
| 80 |
> |
// we will try to disprove this :) |
| 81 |
> |
boolean ip = true; |
| 82 |
> |
short[] ipaddr = {-1, -1, -1, -1}; |
| 83 |
> |
int i = 0; |
| 84 |
> |
String s = ""; |
| 85 |
> |
// tokenize the expression on fullstops, so we can break |
| 86 |
> |
// up the quads of an IP (if it's an IP!) |
| 87 |
> |
StringTokenizer st = new StringTokenizer(expression, "."); |
| 88 |
> |
while(st.hasMoreTokens() && i++ < 4) { |
| 89 |
> |
s = st.nextToken(); |
| 90 |
> |
// if it's a wildcard, we'll skip to the next one |
| 91 |
> |
// as no more checks are required |
| 92 |
> |
if(s.equals("*")) { |
| 93 |
> |
continue; |
| 94 |
> |
} |
| 95 |
> |
// attempt to parse it into a short |
| 96 |
> |
try { |
| 97 |
> |
short n = Short.parseShort(s); |
| 98 |
> |
// if it's an int but outside of the |
| 99 |
> |
// valid range, it can't be an IP |
| 100 |
> |
if(n < 0 || n > 255) { |
| 101 |
> |
ip = false; |
| 102 |
> |
// give up checking further |
| 103 |
> |
break; |
| 104 |
> |
} |
| 105 |
> |
ipaddr[i-1] = n; |
| 106 |
> |
} |
| 107 |
> |
// if it didn't parse as an int it can't be an IP |
| 108 |
> |
catch (NumberFormatException e) { |
| 109 |
> |
ip = false; |
| 110 |
> |
// give up checking further |
| 111 |
> |
break; |
| 112 |
> |
} |
| 113 |
> |
} |
| 114 |
> |
// we've done 4 parts, so if there's any |
| 115 |
> |
// more this can't be an IP |
| 116 |
> |
if(st.hasMoreTokens()) { |
| 117 |
> |
ip = false; |
| 118 |
> |
} |
| 119 |
> |
// if we've done less than 4, see if the last one |
| 120 |
> |
// was a wildcard - if it isn't then it's not an IP |
| 121 |
> |
// -- this allows 129.12.* |
| 122 |
> |
if(i < 4 && !s.equals("*")) { |
| 123 |
> |
ip = false; |
| 124 |
> |
} |
| 125 |
> |
// if we had one or less entries it can't be an IP |
| 126 |
> |
// -- this disallows * matching as an IP due |
| 127 |
> |
// to the rule above |
| 128 |
> |
if(i <= 1) { |
| 129 |
> |
ip = false; |
| 130 |
> |
} |
| 131 |
> |
// add the rule to our array |
| 132 |
> |
_acl.add(new ACLRule(allow, expression, ipaddr, ip)); |
| 133 |
|
} |
| 134 |
|
|
| 135 |
|
/** |
| 153 |
|
/** |
| 154 |
|
* Check to see if an InetAddress is permitted |
| 155 |
|
* by the ACL. Perfect for Socket uses of this |
| 156 |
< |
* class. It should be made clear that this will |
| 157 |
< |
* check both the hostname AND IP address against |
| 158 |
< |
* each rule in turn. The hostname will always be |
| 159 |
< |
* checked BEFORE the IP address. |
| 156 |
> |
* class. A rule will either be for a name, or |
| 157 |
> |
* an IP address (this is determined in the add |
| 158 |
> |
* method), and the appropriate comparison will |
| 159 |
> |
* be performed. |
| 160 |
|
* |
| 161 |
|
* @param address the InetAddress to check |
| 162 |
|
* @return whether the InetAddress was permitted by the ACL |
| 163 |
|
*/ |
| 164 |
|
public boolean check(InetAddress address) { |
| 165 |
+ |
// gather the details first |
| 166 |
+ |
String hostname = address.getHostName(); |
| 167 |
+ |
String ip = address.getHostAddress(); |
| 168 |
+ |
short[] ipaddr = ipStringToShort(ip); |
| 169 |
+ |
// check each rule against this InetAddress |
| 170 |
|
for(int i=0; i < _acl.size(); i++) { |
| 171 |
|
ACLRule rule = (ACLRule) _acl.get(i); |
| 172 |
< |
if(StringUtils.wildcardCheck(address.getHostName(), rule._expression)) { |
| 173 |
< |
return rule._allow; |
| 172 |
> |
if(rule._iprule) { |
| 173 |
> |
// if this is an IP rule do a short comparison |
| 174 |
> |
if(compareShorts(ipaddr, rule._ipaddr)) { |
| 175 |
> |
return rule._allow; |
| 176 |
> |
} |
| 177 |
|
} |
| 178 |
< |
if(StringUtils.wildcardCheck(address.getHostAddress(), rule._expression)) { |
| 179 |
< |
return rule._allow; |
| 178 |
> |
else { |
| 179 |
> |
// if not do a full blown String comparsion |
| 180 |
> |
if(StringUtils.wildcardCheck(hostname, rule._expression)) { |
| 181 |
> |
return rule._allow; |
| 182 |
> |
} |
| 183 |
|
} |
| 184 |
+ |
|
| 185 |
|
} |
| 186 |
+ |
// if we haven't matched a rule, return the default |
| 187 |
|
return _defaultMode; |
| 188 |
|
} |
| 189 |
|
|
| 190 |
|
/** |
| 191 |
< |
* Gets the ACL as a String for debugging. |
| 191 |
> |
* Gives a String representation of this ACL. |
| 192 |
|
* |
| 193 |
|
* @return A String representation of this ACL. |
| 194 |
|
*/ |
| 195 |
< |
public String getStringACL() { |
| 196 |
< |
String acl = ""; |
| 195 |
> |
public String toString() { |
| 196 |
> |
StringBuffer acl = new StringBuffer(); |
| 197 |
> |
// put in the i-scream toString code |
| 198 |
> |
acl.append(FormatName.getName(_name, getClass().getName(), REVISION)); |
| 199 |
> |
acl.append("{"); |
| 200 |
> |
// put the value of each Rule in the result |
| 201 |
|
for(int i=0; i < _acl.size(); i++) { |
| 202 |
< |
ACLRule rule = (ACLRule) _acl.get(i); |
| 203 |
< |
if(rule._allow) { |
| 132 |
< |
acl += "ALLOW:" + rule._expression + " "; |
| 133 |
< |
} |
| 134 |
< |
else { |
| 135 |
< |
acl += "DENY:" + rule._expression + " "; |
| 136 |
< |
} |
| 202 |
> |
acl.append((ACLRule) _acl.get(i)); |
| 203 |
> |
acl.append(","); |
| 204 |
|
} |
| 205 |
+ |
// put the default mode in the result |
| 206 |
|
if(_defaultMode) { |
| 207 |
< |
acl += "DEFAULT:ALLOW"; |
| 207 |
> |
acl.append("DEFAULT=ALLOW"); |
| 208 |
|
} |
| 209 |
|
else { |
| 210 |
< |
acl += "DEFAULT:DENY"; |
| 210 |
> |
acl.append("DEFAULT=DENY"); |
| 211 |
|
} |
| 212 |
< |
return acl; |
| 212 |
> |
acl.append("}"); |
| 213 |
> |
return acl.toString(); |
| 214 |
|
} |
| 215 |
+ |
|
| 216 |
+ |
//---PRIVATE METHODS--- |
| 217 |
+ |
|
| 218 |
+ |
/** |
| 219 |
+ |
* Converts an IP address in String format into |
| 220 |
+ |
* a short array of length 4. Any wildcards, *, |
| 221 |
+ |
* found in the IP address are represented by |
| 222 |
+ |
* a -1. |
| 223 |
+ |
* |
| 224 |
+ |
* @param ip The IP address in String format |
| 225 |
+ |
* @return The IP address in a short[] |
| 226 |
+ |
*/ |
| 227 |
+ |
private short[] ipStringToShort(String ip) { |
| 228 |
+ |
short[] ipaddr = {-1, -1, -1, -1}; |
| 229 |
+ |
StringTokenizer st = new StringTokenizer(ip, "."); |
| 230 |
+ |
for(int i=0; i < 4 && st.hasMoreTokens(); i++) { |
| 231 |
+ |
try { |
| 232 |
+ |
ipaddr[i] = Short.parseShort(st.nextToken()); |
| 233 |
+ |
} |
| 234 |
+ |
catch(NumberFormatException e) { |
| 235 |
+ |
// do nothing? |
| 236 |
+ |
// we just want to leave it as -1 |
| 237 |
+ |
// -- actually, maybe we want to do more checks in here? |
| 238 |
+ |
// although in this code context it'll probably be ok, |
| 239 |
+ |
// it might be worth verifying wildcards and that the |
| 240 |
+ |
// number is in range... |
| 241 |
+ |
} |
| 242 |
+ |
} |
| 243 |
+ |
return ipaddr; |
| 244 |
+ |
} |
| 245 |
|
|
| 246 |
|
/** |
| 247 |
< |
* Overrides the {@link java.lang.Object#toString() Object.toString()} |
| 248 |
< |
* method to provide clean logging (every class should have this). |
| 247 |
> |
* Compares two short arrays. The array can contain a -1, which |
| 248 |
> |
* will always match any value -- it's a wildcard. They must be |
| 249 |
> |
* the same length to match. At the moment the order of the |
| 250 |
> |
* parameters does not matter. |
| 251 |
|
* |
| 252 |
< |
* This uses the uk.org.iscream.cms.server.util.FormatName class |
| 253 |
< |
* to format the toString() |
| 254 |
< |
* |
| 154 |
< |
* @return the name of this class and its CVS revision |
| 252 |
> |
* @param first The first array to compare |
| 253 |
> |
* @param second The second array to compare |
| 254 |
> |
* @result the result of the comparison |
| 255 |
|
*/ |
| 256 |
< |
public String toString() { |
| 257 |
< |
return FormatName.getName( |
| 258 |
< |
_name, |
| 259 |
< |
getClass().getName(), |
| 260 |
< |
REVISION); |
| 256 |
> |
private boolean compareShorts(short[] first, short[] second) { |
| 257 |
> |
if(first.length != second.length) { |
| 258 |
> |
return false; |
| 259 |
> |
} |
| 260 |
> |
for(int i=0; i < first.length; i++) { |
| 261 |
> |
// -- might want to consider specify which is the wildcard one? |
| 262 |
> |
if(first[i] == -1 || second[i] == -1) { |
| 263 |
> |
continue; |
| 264 |
> |
} |
| 265 |
> |
if(first[i] != second[i]) { |
| 266 |
> |
return false; |
| 267 |
> |
} |
| 268 |
> |
} |
| 269 |
> |
return true; |
| 270 |
|
} |
| 271 |
|
|
| 163 |
– |
//---PRIVATE METHODS--- |
| 164 |
– |
|
| 272 |
|
//---ACCESSOR/MUTATOR METHODS--- |
| 273 |
|
|
| 274 |
|
//---ATTRIBUTES--- |
| 301 |
|
/** |
| 302 |
|
* Wrapper class for an ACL rule. |
| 303 |
|
*/ |
| 304 |
< |
private class ACLRule { |
| 304 |
> |
private class ACLRule implements Serializable { |
| 305 |
|
|
| 306 |
|
/** |
| 307 |
|
* Construct an ACL rule. |
| 308 |
|
* |
| 309 |
|
* @param allow whether this is an ALLOW or DENY rule |
| 310 |
|
* @param expression what this rule matches |
| 311 |
+ |
* @param ipaddr the IP address wildcard this rule matches if it's an IP rule |
| 312 |
+ |
* @param iprule whether this is an IP rule |
| 313 |
|
*/ |
| 314 |
< |
private ACLRule(boolean allow, String expression) { |
| 314 |
> |
private ACLRule(boolean allow, String expression, short[] ipaddr, boolean iprule) { |
| 315 |
|
_allow = allow; |
| 316 |
|
_expression = expression; |
| 317 |
+ |
_ipaddr = ipaddr; |
| 318 |
+ |
_iprule = iprule; |
| 319 |
|
} |
| 320 |
|
|
| 321 |
|
/** |
| 322 |
+ |
* Returns a String representation of this rule. |
| 323 |
+ |
* |
| 324 |
+ |
* @return A String representation of this rule. |
| 325 |
+ |
*/ |
| 326 |
+ |
public String toString() { |
| 327 |
+ |
if(_allow) { |
| 328 |
+ |
return _expression + "=ALLOW"; |
| 329 |
+ |
} |
| 330 |
+ |
else { |
| 331 |
+ |
return _expression + "=DENY"; |
| 332 |
+ |
} |
| 333 |
+ |
} |
| 334 |
+ |
|
| 335 |
+ |
/** |
| 336 |
|
* Whether this is an ALLOW or DENY rule. |
| 337 |
|
*/ |
| 338 |
|
private boolean _allow; |
| 341 |
|
* What this rule matches. |
| 342 |
|
*/ |
| 343 |
|
private String _expression; |
| 344 |
+ |
|
| 345 |
+ |
/** |
| 346 |
+ |
* The IP wildcard, only valid if this |
| 347 |
+ |
* is an IP rule. |
| 348 |
+ |
*/ |
| 349 |
+ |
private short[] _ipaddr; |
| 350 |
+ |
|
| 351 |
+ |
/** |
| 352 |
+ |
* Whether this is an IP rule. |
| 353 |
+ |
*/ |
| 354 |
+ |
private boolean _iprule; |
| 355 |
|
|
| 356 |
|
} |
| 357 |
|
|
