* The host/port combination is specified as followed *
*
* hostname[:[-]port[-[port]]] **
* The hostname portion can be either a hostname or IP address. If it is * a hostname, a wildcard is allowed in hostnames. This wildcard is a "*" * and matches one or more characters. Only one "*" may appear in the * host and it must be the leftmost character. For example, * "*.urbanophile.com" matches all hosts in the "urbanophile.com" domain. *
* The port portion can be either a single value, or a range of values * treated as inclusive. The first or the last port value in the range * can be omitted in which case either the minimum or maximum legal * value for a port (respectively) is used by default. Here are some * examples: *
* The permission list is a comma separated list of individual permissions. * These individual permissions are: *
* accept
* connect
* listen
* resolve
*
* The "listen" permission is only relevant if the host is localhost. If * any permission at all is specified, then resolve permission is implied to * exist. *
* Here are a variety of examples of how to create SocketPermission's *
* SocketPermission("www.urbanophile.com", "connect");
* Can connect to any port on www.urbanophile.com
* SocketPermission("www.urbanophile.com:80", "connect,accept");
* Can connect to or accept connections from www.urbanophile.com on port 80
* SocketPermission("localhost:1024-", "listen,accept,connect");
* Can connect to, accept from, an listen on any local port number 1024
* and up.
* SocketPermission("*.edu", "connect");
* Can connect to any host in the edu domain
* SocketPermission("197.197.20.1", "accept");
* Can accept connections from 197.197.20.1
*
*
* @since 1.2
*
* @author Aaron M. Renn (arenn@urbanophile.com)
*/
public final class SocketPermission extends Permission
implements Serializable
{
static final long serialVersionUID = -7204263841984476862L;
// FIXME: Needs serialization work, including readObject/writeObject methods.
/**
* A hostname/port combination as described above
*/
private transient String hostport;
/**
* A comma separated list of actions for which we have permission
*/
private String actions;
/**
* Initializes a new instance of SocketPermission with the
* specified host/port combination and actions string.
*
* @param hostport The hostname/port number combination
* @param actions The actions string
*/
public SocketPermission(String hostport, String actions)
{
super(hostport);
this.hostport = hostport;
this.actions = actions;
}
/**
* Tests this object for equality against another. This will be true if
* and only if the passed object is an instance of
* SocketPermission and both its hostname/port combination
* and permissions string are identical.
*
* @param obj The object to test against for equality
*
* @return true if object is equal to this object,
* false otherwise.
*/
public boolean equals(Object obj)
{
if (obj == null)
return (false);
if (!(obj instanceof SocketPermission))
return (false);
if (((SocketPermission) obj).hostport.equals(hostport))
if (((SocketPermission) obj).actions.equals(actions))
return (true);
return (false);
}
/**
* Returns a hash code value for this object. Overrides the
* Permission.hashCode()
*
* @return A hash code
*/
public int hashCode()
{
int hash = 100;
// FIXME: Get a real hash function
for (int i = 0; i < hostport.length(); i++)
hash = hash + (int) hostport.charAt(i) * 7;
return (hash);
}
/**
* Returns the list of permission actions in this object in canonical
* order. The canonical order is "connect,listen,accept,resolve"
*
* @return The permitted action string.
*/
public String getActions()
{
boolean found = false;
StringBuffer sb = new StringBuffer("");
if (actions.indexOf("connect") != -1)
{
sb.append("connect");
found = true;
}
if (actions.indexOf("listen") != -1)
if (found)
sb.append(",listen");
else
{
sb.append("listen");
found = true;
}
if (actions.indexOf("accept") != -1)
if (found)
sb.append(",accept");
else
{
sb.append("accept");
found = true;
}
if (found)
sb.append(",resolve");
else if (actions.indexOf("resolve") != -1)
sb.append("resolve");
return (sb.toString());
}
/**
* Returns a new PermissionCollection object that can hold
* SocketPermission's.
*
* @return A new PermissionCollection.
*/
public PermissionCollection newPermissionCollection()
{
// FIXME: Implement
return (null);
}
/**
* Returns true if the permission object passed it is implied by the
* this permission. This will be true if
*
* The argument's hostname will be a subset of this object's hostname if: *
true if the Permission is implied by
* this object, false otherwise.
*/
public boolean implies(Permission perm)
{
SocketPermission p;
// First make sure we are the right object type
if (perm instanceof SocketPermission)
p = (SocketPermission) perm;
else
return (false);
// Next check the actions
String ourlist = getActions();
String theirlist = p.getActions();
if (!ourlist.startsWith(theirlist))
return (false);
// Now check ports
int ourfirstport = 0, ourlastport = 0, theirfirstport = 0, theirlastport =
0;
// Get ours
if (hostport.indexOf(":") == -1)
{
ourfirstport = 0;
ourlastport = 65535;
}
else
{
// FIXME: Needs bulletproofing.
// This will dump if hostport if all sorts of bad data was passed to
// the constructor
String range = hostport.substring(hostport.indexOf(":") + 1);
if (range.startsWith("-"))
ourfirstport = 0;
else if (range.indexOf("-") == -1)
ourfirstport = Integer.parseInt(range);
else
ourfirstport =
Integer.parseInt(range.substring(0, range.indexOf("-")));
if (range.endsWith("-"))
ourlastport = 65535;
else if (range.indexOf("-") == -1)
ourlastport = Integer.parseInt(range);
else
ourlastport =
Integer.parseInt(range.
substring(range.indexOf("-") + 1,
range.length()));
}
// Get theirs
if (p.hostport.indexOf(":") == -1)
{
theirfirstport = 0;
ourlastport = 65535;
}
else
{
// This will dump if hostport if all sorts of bad data was passed to
// the constructor
String range = p.hostport.substring(hostport.indexOf(":") + 1);
if (range.startsWith("-"))
theirfirstport = 0;
else if (range.indexOf("-") == -1)
theirfirstport = Integer.parseInt(range);
else
theirfirstport =
Integer.parseInt(range.substring(0, range.indexOf("-")));
if (range.endsWith("-"))
theirlastport = 65535;
else if (range.indexOf("-") == -1)
theirlastport = Integer.parseInt(range);
else
theirlastport =
Integer.parseInt(range.
substring(range.indexOf("-") + 1,
range.length()));
}
// Now check them
if ((theirfirstport < ourfirstport) || (theirlastport > ourlastport))
return (false);
// Finally we can check the hosts
String ourhost, theirhost;
// Get ours
if (hostport.indexOf(":") == -1)
ourhost = hostport;
else
ourhost = hostport.substring(0, hostport.indexOf(":"));
// Get theirs
if (p.hostport.indexOf(":") == -1)
theirhost = p.hostport;
else
theirhost = p.hostport.substring(0, p.hostport.indexOf(":"));
// Are they equal?
if (ourhost.equals(theirhost))
return (true);
// Try the canonical names
String ourcanonical = null, theircanonical = null;
try
{
ourcanonical = InetAddress.getByName(ourhost).getHostName();
theircanonical = InetAddress.getByName(theirhost).getHostName();
}
catch (UnknownHostException e)
{
// Who didn't resolve? Just assume current address is canonical enough
// Is this ok to do?
if (ourcanonical == null)
ourcanonical = ourhost;
if (theircanonical == null)
theircanonical = theirhost;
}
if (ourcanonical.equals(theircanonical))
return (true);
// Well, last chance. Try for a wildcard
if (ourhost.indexOf("*.") != -1)
{
String wild_domain = ourhost.substring(ourhost.indexOf("*" + 1));
if (theircanonical.endsWith(wild_domain))
return (true);
}
// Didn't make it
return (false);
}
}