Java tutorial
/* * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.net; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.ObjectStreamField; import java.io.Serializable; import java.net.InetAddress; import java.security.AccessController; import java.security.Permission; import java.security.PermissionCollection; import java.security.PrivilegedAction; import java.security.Security; import java.util.Collections; import java.util.Comparator; import java.util.Enumeration; import java.util.Vector; import java.util.StringJoiner; import java.util.StringTokenizer; import java.util.concurrent.ConcurrentSkipListMap; import sun.net.util.IPAddressUtil; import sun.net.PortConfig; import sun.security.util.RegisteredDomain; import sun.security.util.SecurityConstants; import sun.security.util.Debug; /** * This class represents access to a network via sockets. * A SocketPermission consists of a * host specification and a set of "actions" specifying ways to * connect to that host. The host is specified as * <pre> * host = (hostname | IPv4address | iPv6reference) [:portrange] * portrange = portnumber | -portnumber | portnumber-[portnumber] * </pre> * The host is expressed as a DNS name, as a numerical IP address, * or as "localhost" (for the local machine). * The wildcard "*" may be included once in a DNS name host * specification. If it is included, it must be in the leftmost * position, as in "*.example.com". * <p> * The format of the IPv6reference should follow that specified in <a * href="http://www.ietf.org/rfc/rfc2732.txt"><i>RFC 2732: Format * for Literal IPv6 Addresses in URLs</i></a>: * <pre> * ipv6reference = "[" IPv6address "]" *</pre> * For example, you can construct a SocketPermission instance * as the following: * <pre> * String hostAddress = inetaddress.getHostAddress(); * if (inetaddress instanceof Inet6Address) { * sp = new SocketPermission("[" + hostAddress + "]:" + port, action); * } else { * sp = new SocketPermission(hostAddress + ":" + port, action); * } * </pre> * or * <pre> * String host = url.getHost(); * sp = new SocketPermission(host + ":" + port, action); * </pre> * <p> * The <A HREF="Inet6Address.html#lform">full uncompressed form</A> of * an IPv6 literal address is also valid. * <p> * The port or portrange is optional. A port specification of the * form "N-", where <i>N</i> is a port number, signifies all ports * numbered <i>N</i> and above, while a specification of the * form "-N" indicates all ports numbered <i>N</i> and below. * The special port value {@code 0} refers to the entire <i>ephemeral</i> * port range. This is a fixed range of ports a system may use to * allocate dynamic ports from. The actual range may be system dependent. * <p> * The possible ways to connect to the host are * <pre> * accept * connect * listen * resolve * </pre> * The "listen" action is only meaningful when used with "localhost" and * means the ability to bind to a specified port. * The "resolve" action is implied when any of the other actions are present. * The action "resolve" refers to host/ip name service lookups. * <P> * The actions string is converted to lowercase before processing. * <p>As an example of the creation and meaning of SocketPermissions, * note that if the following permission: * * <pre> * p1 = new SocketPermission("foo.example.com:7777", "connect,accept"); * </pre> * * is granted to some code, it allows that code to connect to port 7777 on * {@code foo.example.com}, and to accept connections on that port. * * <p>Similarly, if the following permission: * * <pre> * p2 = new SocketPermission("localhost:1024-", "accept,connect,listen"); * </pre> * * is granted to some code, it allows that code to * accept connections on, connect to, or listen on any port between * 1024 and 65535 on the local host. * * <p>Note: Granting code permission to accept or make connections to remote * hosts may be dangerous because malevolent code can then more easily * transfer and share confidential data among parties who may not * otherwise have access to the data. * * @see java.security.Permissions * @see SocketPermission * * * @author Marianne Mueller * @author Roland Schemers * @since 1.2 * * @serial exclude */ public final class SocketPermission extends Permission implements java.io.Serializable { private static final long serialVersionUID = -7204263841984476862L; /** * Connect to host:port */ private static final int CONNECT = 0x1; /** * Listen on host:port */ private static final int LISTEN = 0x2; /** * Accept a connection from host:port */ private static final int ACCEPT = 0x4; /** * Resolve DNS queries */ private static final int RESOLVE = 0x8; /** * No actions */ private static final int NONE = 0x0; /** * All actions */ private static final int ALL = CONNECT | LISTEN | ACCEPT | RESOLVE; // various port constants private static final int PORT_MIN = 0; private static final int PORT_MAX = 65535; private static final int PRIV_PORT_MAX = 1023; private static final int DEF_EPH_LOW = 49152; // the actions mask private transient int mask; /** * the actions string. * * @serial */ private String actions; // Left null as long as possible, then // created and re-used in the getAction function. // hostname part as it is passed private transient String hostname; // the canonical name of the host // in the case of "*.foo.com", cname is ".foo.com". private transient String cname; // all the IP addresses of the host private transient InetAddress[] addresses; // true if the hostname is a wildcard (e.g. "*.example.com") private transient boolean wildcard; // true if we were initialized with a single numeric IP address private transient boolean init_with_ip; // true if this SocketPermission represents an invalid/unknown host // used for implies when the delayed lookup has already failed private transient boolean invalid; // port range on host private transient int[] portrange; private transient boolean defaultDeny = false; // true if this SocketPermission represents a hostname // that failed our reverse mapping heuristic test private transient boolean untrusted; private transient boolean trusted; // true if the sun.net.trustNameService system property is set private static boolean trustNameService; private static Debug debug = null; private static boolean debugInit = false; // lazy initializer private static class EphemeralRange { static final int low = initEphemeralPorts("low", DEF_EPH_LOW); static final int high = initEphemeralPorts("high", PORT_MAX); }; static { Boolean tmp = java.security.AccessController .doPrivileged(new sun.security.action.GetBooleanAction("sun.net.trustNameService")); trustNameService = tmp.booleanValue(); } private static synchronized Debug getDebug() { if (!debugInit) { debug = Debug.getInstance("access"); debugInit = true; } return debug; } /** * Creates a new SocketPermission object with the specified actions. * The host is expressed as a DNS name, or as a numerical IP address. * Optionally, a port or a portrange may be supplied (separated * from the DNS name or IP address by a colon). * <p> * To specify the local machine, use "localhost" as the <i>host</i>. * Also note: An empty <i>host</i> String ("") is equivalent to "localhost". * <p> * The <i>actions</i> parameter contains a comma-separated list of the * actions granted for the specified host (and port(s)). Possible actions are * "connect", "listen", "accept", "resolve", or * any combination of those. "resolve" is automatically added * when any of the other three are specified. * <p> * Examples of SocketPermission instantiation are the following: * <pre> * nr = new SocketPermission("www.example.com", "connect"); * nr = new SocketPermission("www.example.com:80", "connect"); * nr = new SocketPermission("*.example.com", "connect"); * nr = new SocketPermission("*.edu", "resolve"); * nr = new SocketPermission("204.160.241.0", "connect"); * nr = new SocketPermission("localhost:1024-65535", "listen"); * nr = new SocketPermission("204.160.241.0:1024-65535", "connect"); * </pre> * * @param host the hostname or IP address of the computer, optionally * including a colon followed by a port or port range. * @param action the action string. */ public SocketPermission(String host, String action) { super(getHost(host)); // name initialized to getHost(host); NPE detected in getHost() init(getName(), getMask(action)); } SocketPermission(String host, int mask) { super(getHost(host)); // name initialized to getHost(host); NPE detected in getHost() init(getName(), mask); } private void setDeny() { defaultDeny = true; } private static String getHost(String host) { if (host.isEmpty()) { return "localhost"; } else { /* IPv6 literal address used in this context should follow * the format specified in RFC 2732; * if not, we try to solve the unambiguous case */ int ind; if (host.charAt(0) != '[') { if ((ind = host.indexOf(':')) != host.lastIndexOf(':')) { /* More than one ":", meaning IPv6 address is not * in RFC 2732 format; * We will rectify user errors for all unambiguous cases */ StringTokenizer st = new StringTokenizer(host, ":"); int tokens = st.countTokens(); if (tokens == 9) { // IPv6 address followed by port ind = host.lastIndexOf(':'); host = "[" + host.substring(0, ind) + "]" + host.substring(ind); } else if (tokens == 8 && host.indexOf("::") == -1) { // IPv6 address only, not followed by port host = "[" + host + "]"; } else { // could be ambiguous throw new IllegalArgumentException("Ambiguous" + " hostport part"); } } } return host; } } private int[] parsePort(String port) throws Exception { if (port == null || port.isEmpty() || port.equals("*")) { return new int[] { PORT_MIN, PORT_MAX }; } int dash = port.indexOf('-'); if (dash == -1) { int p = Integer.parseInt(port); return new int[] { p, p }; } else { String low = port.substring(0, dash); String high = port.substring(dash + 1); int l, h; if (low.isEmpty()) { l = PORT_MIN; } else { l = Integer.parseInt(low); } if (high.isEmpty()) { h = PORT_MAX; } else { h = Integer.parseInt(high); } if (l < 0 || h < 0 || h < l) throw new IllegalArgumentException("invalid port range"); return new int[] { l, h }; } } /** * Returns true if the permission has specified zero * as its value (or lower bound) signifying the ephemeral range */ private boolean includesEphemerals() { return portrange[0] == 0; } /** * Initialize the SocketPermission object. We don't do any DNS lookups * as this point, instead we hold off until the implies method is * called. */ private void init(String host, int mask) { // Set the integer mask that represents the actions if ((mask & ALL) != mask) throw new IllegalArgumentException("invalid actions mask"); // always OR in RESOLVE if we allow any of the others this.mask = mask | RESOLVE; // Parse the host name. A name has up to three components, the // hostname, a port number, or two numbers representing a port // range. "www.example.com:8080-9090" is a valid host name. // With IPv6 an address can be 2010:836B:4179::836B:4179 // An IPv6 address needs to be enclose in [] // For ex: [2010:836B:4179::836B:4179]:8080-9090 // Refer to RFC 2732 for more information. int rb = 0; int start = 0, end = 0; int sep = -1; String hostport = host; if (host.charAt(0) == '[') { start = 1; rb = host.indexOf(']'); if (rb != -1) { host = host.substring(start, rb); } else { throw new IllegalArgumentException("invalid host/port: " + host); } sep = hostport.indexOf(':', rb + 1); } else { start = 0; sep = host.indexOf(':', rb); end = sep; if (sep != -1) { host = host.substring(start, end); } } if (sep != -1) { String port = hostport.substring(sep + 1); try { portrange = parsePort(port); } catch (Exception e) { throw new IllegalArgumentException("invalid port range: " + port); } } else { portrange = new int[] { PORT_MIN, PORT_MAX }; } hostname = host; // is this a domain wildcard specification if (host.lastIndexOf('*') > 0) { throw new IllegalArgumentException("invalid host wildcard specification"); } else if (host.startsWith("*")) { wildcard = true; if (host.equals("*")) { cname = ""; } else if (host.startsWith("*.")) { cname = host.substring(1).toLowerCase(); } else { throw new IllegalArgumentException("invalid host wildcard specification"); } return; } else { if (!host.isEmpty()) { // see if we are being initialized with an IP address. char ch = host.charAt(0); if (ch == ':' || Character.digit(ch, 16) != -1) { byte ip[] = IPAddressUtil.textToNumericFormatV4(host); if (ip == null) { ip = IPAddressUtil.textToNumericFormatV6(host); } if (ip != null) { try { addresses = new InetAddress[] { InetAddress.getByAddress(ip) }; init_with_ip = true; } catch (UnknownHostException uhe) { // this shouldn't happen invalid = true; } } } } } } /** * Convert an action string to an integer actions mask. * * @param action the action string * @return the action mask */ private static int getMask(String action) { if (action == null) { throw new NullPointerException("action can't be null"); } if (action.isEmpty()) { throw new IllegalArgumentException("action can't be empty"); } int mask = NONE; // Use object identity comparison against known-interned strings for // performance benefit (these values are used heavily within the JDK). if (action == SecurityConstants.SOCKET_RESOLVE_ACTION) { return RESOLVE; } else if (action == SecurityConstants.SOCKET_CONNECT_ACTION) { return CONNECT; } else if (action == SecurityConstants.SOCKET_LISTEN_ACTION) { return LISTEN; } else if (action == SecurityConstants.SOCKET_ACCEPT_ACTION) { return ACCEPT; } else if (action == SecurityConstants.SOCKET_CONNECT_ACCEPT_ACTION) { return CONNECT | ACCEPT; } char[] a = action.toCharArray(); int i = a.length - 1; if (i < 0) return mask; while (i != -1) { char c; // skip whitespace while ((i != -1) && ((c = a[i]) == ' ' || c == '\r' || c == '\n' || c == '\f' || c == '\t')) i--; // check for the known strings int matchlen; if (i >= 6 && (a[i - 6] == 'c' || a[i - 6] == 'C') && (a[i - 5] == 'o' || a[i - 5] == 'O') && (a[i - 4] == 'n' || a[i - 4] == 'N') && (a[i - 3] == 'n' || a[i - 3] == 'N') && (a[i - 2] == 'e' || a[i - 2] == 'E') && (a[i - 1] == 'c' || a[i - 1] == 'C') && (a[i] == 't' || a[i] == 'T')) { matchlen = 7; mask |= CONNECT; } else if (i >= 6 && (a[i - 6] == 'r' || a[i - 6] == 'R') && (a[i - 5] == 'e' || a[i - 5] == 'E') && (a[i - 4] == 's' || a[i - 4] == 'S') && (a[i - 3] == 'o' || a[i - 3] == 'O') && (a[i - 2] == 'l' || a[i - 2] == 'L') && (a[i - 1] == 'v' || a[i - 1] == 'V') && (a[i] == 'e' || a[i] == 'E')) { matchlen = 7; mask |= RESOLVE; } else if (i >= 5 && (a[i - 5] == 'l' || a[i - 5] == 'L') && (a[i - 4] == 'i' || a[i - 4] == 'I') && (a[i - 3] == 's' || a[i - 3] == 'S') && (a[i - 2] == 't' || a[i - 2] == 'T') && (a[i - 1] == 'e' || a[i - 1] == 'E') && (a[i] == 'n' || a[i] == 'N')) { matchlen = 6; mask |= LISTEN; } else if (i >= 5 && (a[i - 5] == 'a' || a[i - 5] == 'A') && (a[i - 4] == 'c' || a[i - 4] == 'C') && (a[i - 3] == 'c' || a[i - 3] == 'C') && (a[i - 2] == 'e' || a[i - 2] == 'E') && (a[i - 1] == 'p' || a[i - 1] == 'P') && (a[i] == 't' || a[i] == 'T')) { matchlen = 6; mask |= ACCEPT; } else { // parse error throw new IllegalArgumentException("invalid permission: " + action); } // make sure we didn't just match the tail of a word // like "ackbarfaccept". Also, skip to the comma. boolean seencomma = false; while (i >= matchlen && !seencomma) { switch (a[i - matchlen]) { case ',': seencomma = true; break; case ' ': case '\r': case '\n': case '\f': case '\t': break; default: throw new IllegalArgumentException("invalid permission: " + action); } i--; } // point i at the location of the comma minus one (or -1). i -= matchlen; } return mask; } private boolean isUntrusted() throws UnknownHostException { if (trusted) return false; if (invalid || untrusted) return true; try { if (!trustNameService && (defaultDeny || sun.net.www.URLConnection.isProxiedHost(hostname))) { if (this.cname == null) { this.getCanonName(); } if (!match(cname, hostname)) { // Last chance if (!authorized(hostname, addresses[0].getAddress())) { untrusted = true; Debug debug = getDebug(); if (debug != null && Debug.isOn("failure")) { debug.println("socket access restriction: proxied host " + "(" + addresses[0] + ")" + " does not match " + cname + " from reverse lookup"); } return true; } } trusted = true; } } catch (UnknownHostException uhe) { invalid = true; throw uhe; } return false; } /** * attempt to get the fully qualified domain name * */ void getCanonName() throws UnknownHostException { if (cname != null || invalid || untrusted) return; // attempt to get the canonical name try { // first get the IP addresses if we don't have them yet // this is because we need the IP address to then get // FQDN. if (addresses == null) { getIP(); } // we have to do this check, otherwise we might not // get the fully qualified domain name if (init_with_ip) { cname = addresses[0].getHostName(false).toLowerCase(); } else { cname = InetAddress.getByName(addresses[0].getHostAddress()).getHostName(false).toLowerCase(); } } catch (UnknownHostException uhe) { invalid = true; throw uhe; } } private transient String cdomain, hdomain; /** * previously we allowed domain names to be specified in IDN ACE form * Need to check for that and convert to Unicode */ private static String checkForIDN(String name) { if (name.startsWith("xn--") || name.contains(".xn--")) { return IDN.toUnicode(name); } else { return name; } } private boolean match(String cname, String hname) { String a = checkForIDN(cname.toLowerCase()); String b = checkForIDN(hname.toLowerCase()); if (a.startsWith(b) && ((a.length() == b.length()) || (a.charAt(b.length()) == '.'))) { return true; } if (cdomain == null) { cdomain = RegisteredDomain.from(a).map(RegisteredDomain::name).orElse(a); } if (hdomain == null) { hdomain = RegisteredDomain.from(b).map(RegisteredDomain::name).orElse(b); } return !cdomain.isEmpty() && !hdomain.isEmpty() && cdomain.equals(hdomain); } private boolean authorized(String cname, byte[] addr) { if (addr.length == 4) return authorizedIPv4(cname, addr); else if (addr.length == 16) return authorizedIPv6(cname, addr); else return false; } private boolean authorizedIPv4(String cname, byte[] addr) { String authHost = ""; InetAddress auth; try { authHost = "auth." + (addr[3] & 0xff) + "." + (addr[2] & 0xff) + "." + (addr[1] & 0xff) + "." + (addr[0] & 0xff) + ".in-addr.arpa"; // Following check seems unnecessary // auth = InetAddress.getAllByName0(authHost, false)[0]; authHost = hostname + '.' + authHost; auth = InetAddress.getAllByName0(authHost, false)[0]; if (auth.equals(InetAddress.getByAddress(addr))) { return true; } Debug debug = getDebug(); if (debug != null && Debug.isOn("failure")) { debug.println("socket access restriction: IP address of " + auth + " != " + InetAddress.getByAddress(addr)); } } catch (UnknownHostException uhe) { Debug debug = getDebug(); if (debug != null && Debug.isOn("failure")) { debug.println("socket access restriction: forward lookup failed for " + authHost); } } return false; } private boolean authorizedIPv6(String cname, byte[] addr) { String authHost = ""; InetAddress auth; try { StringBuilder sb = new StringBuilder(39); for (int i = 15; i >= 0; i--) { sb.append(Integer.toHexString(((addr[i]) & 0x0f))); sb.append('.'); sb.append(Integer.toHexString(((addr[i] >> 4) & 0x0f))); sb.append('.'); } authHost = "auth." + sb.toString() + "IP6.ARPA"; //auth = InetAddress.getAllByName0(authHost, false)[0]; authHost = hostname + '.' + authHost; auth = InetAddress.getAllByName0(authHost, false)[0]; if (auth.equals(InetAddress.getByAddress(addr))) return true; Debug debug = getDebug(); if (debug != null && Debug.isOn("failure")) { debug.println("socket access restriction: IP address of " + auth + " != " + InetAddress.getByAddress(addr)); } } catch (UnknownHostException uhe) { Debug debug = getDebug(); if (debug != null && Debug.isOn("failure")) { debug.println("socket access restriction: forward lookup failed for " + authHost); } } return false; } /** * get IP addresses. Sets invalid to true if we can't get them. * */ void getIP() throws UnknownHostException { if (addresses != null || wildcard || invalid) return; try { // now get all the IP addresses String host; if (getName().charAt(0) == '[') { // Literal IPv6 address host = getName().substring(1, getName().indexOf(']')); } else { int i = getName().indexOf(':'); if (i == -1) host = getName(); else { host = getName().substring(0, i); } } addresses = new InetAddress[] { InetAddress.getAllByName0(host, false)[0] }; } catch (UnknownHostException uhe) { invalid = true; throw uhe; } catch (IndexOutOfBoundsException iobe) { invalid = true; throw new UnknownHostException(getName()); } } /** * Checks if this socket permission object "implies" the * specified permission. * <P> * More specifically, this method first ensures that all of the following * are true (and returns false if any of them are not): * <ul> * <li> <i>p</i> is an instanceof SocketPermission, * <li> <i>p</i>'s actions are a proper subset of this * object's actions, and * <li> <i>p</i>'s port range is included in this port range. Note: * port range is ignored when p only contains the action, 'resolve'. * </ul> * * Then {@code implies} checks each of the following, in order, * and for each returns true if the stated condition is true: * <ul> * <li> If this object was initialized with a single IP address and one of <i>p</i>'s * IP addresses is equal to this object's IP address. * <li>If this object is a wildcard domain (such as *.example.com), and * <i>p</i>'s canonical name (the name without any preceding *) * ends with this object's canonical host name. For example, *.example.com * implies *.foo.example.com. * <li>If this object was not initialized with a single IP address, and one of this * object's IP addresses equals one of <i>p</i>'s IP addresses. * <li>If this canonical name equals <i>p</i>'s canonical name. * </ul> * * If none of the above are true, {@code implies} returns false. * @param p the permission to check against. * * @return true if the specified permission is implied by this object, * false if not. */ @Override public boolean implies(Permission p) { int i, j; if (!(p instanceof SocketPermission)) return false; if (p == this) return true; SocketPermission that = (SocketPermission) p; return ((this.mask & that.mask) == that.mask) && impliesIgnoreMask(that); } /** * Checks if the incoming Permission's action are a proper subset of * the this object's actions. * <P> * Check, in the following order: * <ul> * <li> Checks that "p" is an instanceof a SocketPermission * <li> Checks that "p"'s actions are a proper subset of the * current object's actions. * <li> Checks that "p"'s port range is included in this port range * <li> If this object was initialized with an IP address, checks that * one of "p"'s IP addresses is equal to this object's IP address. * <li> If either object is a wildcard domain (i.e., "*.example.com"), * attempt to match based on the wildcard. * <li> If this object was not initialized with an IP address, attempt * to find a match based on the IP addresses in both objects. * <li> Attempt to match on the canonical hostnames of both objects. * </ul> * @param that the incoming permission request * * @return true if "permission" is a proper subset of the current object, * false if not. */ boolean impliesIgnoreMask(SocketPermission that) { int i, j; if ((that.mask & RESOLVE) != that.mask) { // check simple port range if ((that.portrange[0] < this.portrange[0]) || (that.portrange[1] > this.portrange[1])) { // if either includes the ephemeral range, do full check if (this.includesEphemerals() || that.includesEphemerals()) { if (!inRange(this.portrange[0], this.portrange[1], that.portrange[0], that.portrange[1])) { return false; } } else { return false; } } } // allow a "*" wildcard to always match anything if (this.wildcard && "".equals(this.cname)) return true; // return if either one of these NetPerm objects are invalid... if (this.invalid || that.invalid) { return compareHostnames(that); } try { if (this.init_with_ip) { // we only check IP addresses if (that.wildcard) return false; if (that.init_with_ip) { return (this.addresses[0].equals(that.addresses[0])); } else { if (that.addresses == null) { that.getIP(); } for (i = 0; i < that.addresses.length; i++) { if (this.addresses[0].equals(that.addresses[i])) return true; } } // since "this" was initialized with an IP address, we // don't check any other cases return false; } // check and see if we have any wildcards... if (this.wildcard || that.wildcard) { // if they are both wildcards, return true iff // that's cname ends with this cname (i.e., *.example.com // implies *.foo.example.com) if (this.wildcard && that.wildcard) return (that.cname.endsWith(this.cname)); // a non-wildcard can't imply a wildcard if (that.wildcard) return false; // this is a wildcard, lets see if that's cname ends with // it... if (that.cname == null) { that.getCanonName(); } return (that.cname.endsWith(this.cname)); } // compare IP addresses if (this.addresses == null) { this.getIP(); } if (that.addresses == null) { that.getIP(); } if (!(that.init_with_ip && this.isUntrusted())) { for (j = 0; j < this.addresses.length; j++) { for (i = 0; i < that.addresses.length; i++) { if (this.addresses[j].equals(that.addresses[i])) return true; } } // XXX: if all else fails, compare hostnames? // Do we really want this? if (this.cname == null) { this.getCanonName(); } if (that.cname == null) { that.getCanonName(); } return (this.cname.equalsIgnoreCase(that.cname)); } } catch (UnknownHostException uhe) { return compareHostnames(that); } // make sure the first thing that is done here is to return // false. If not, uncomment the return false in the above catch. return false; } private boolean compareHostnames(SocketPermission that) { // we see if the original names/IPs passed in were equal. String thisHost = hostname; String thatHost = that.hostname; if (thisHost == null) { return false; } else if (this.wildcard) { final int cnameLength = this.cname.length(); return thatHost.regionMatches(true, (thatHost.length() - cnameLength), this.cname, 0, cnameLength); } else { return thisHost.equalsIgnoreCase(thatHost); } } /** * Checks two SocketPermission objects for equality. * * @param obj the object to test for equality with this object. * * @return true if <i>obj</i> is a SocketPermission, and has the * same hostname, port range, and actions as this * SocketPermission object. However, port range will be ignored * in the comparison if <i>obj</i> only contains the action, 'resolve'. */ @Override public boolean equals(Object obj) { if (obj == this) return true; if (!(obj instanceof SocketPermission)) return false; SocketPermission that = (SocketPermission) obj; //this is (overly?) complex!!! // check the mask first if (this.mask != that.mask) return false; if ((that.mask & RESOLVE) != that.mask) { // now check the port range... if ((this.portrange[0] != that.portrange[0]) || (this.portrange[1] != that.portrange[1])) { return false; } } // short cut. This catches: // "crypto" equal to "crypto", or // "1.2.3.4" equal to "1.2.3.4.", or // "*.edu" equal to "*.edu", but it // does not catch "crypto" equal to // "crypto.foo.example.com". if (this.getName().equalsIgnoreCase(that.getName())) { return true; } // we now attempt to get the Canonical (FQDN) name and // compare that. If this fails, about all we can do is return // false. try { this.getCanonName(); that.getCanonName(); } catch (UnknownHostException uhe) { return false; } if (this.invalid || that.invalid) return false; if (this.cname != null) { return this.cname.equalsIgnoreCase(that.cname); } return false; } /** * Returns the hash code value for this object. * * @return a hash code value for this object. */ @Override public int hashCode() { /* * If this SocketPermission was initialized with an IP address * or a wildcard, use getName().hashCode(), otherwise use * the hashCode() of the host name returned from * java.net.InetAddress.getHostName method. */ if (init_with_ip || wildcard) { return this.getName().hashCode(); } try { getCanonName(); } catch (UnknownHostException uhe) { } if (invalid || cname == null) return this.getName().hashCode(); else return this.cname.hashCode(); } /** * Return the current action mask. * * @return the actions mask. */ int getMask() { return mask; } /** * Returns the "canonical string representation" of the actions in the * specified mask. * Always returns present actions in the following order: * connect, listen, accept, resolve. * * @param mask a specific integer action mask to translate into a string * @return the canonical string representation of the actions */ private static String getActions(int mask) { StringJoiner sj = new StringJoiner(","); if ((mask & CONNECT) == CONNECT) { sj.add("connect"); } if ((mask & LISTEN) == LISTEN) { sj.add("listen"); } if ((mask & ACCEPT) == ACCEPT) { sj.add("accept"); } if ((mask & RESOLVE) == RESOLVE) { sj.add("resolve"); } return sj.toString(); } /** * Returns the canonical string representation of the actions. * Always returns present actions in the following order: * connect, listen, accept, resolve. * * @return the canonical string representation of the actions. */ @Override public String getActions() { if (actions == null) actions = getActions(this.mask); return actions; } /** * Returns a new PermissionCollection object for storing SocketPermission * objects. * <p> * SocketPermission objects must be stored in a manner that allows them * to be inserted into the collection in any order, but that also enables the * PermissionCollection {@code implies} * method to be implemented in an efficient (and consistent) manner. * * @return a new PermissionCollection object suitable for storing SocketPermissions. */ @Override public PermissionCollection newPermissionCollection() { return new SocketPermissionCollection(); } /** * WriteObject is called to save the state of the SocketPermission * to a stream. The actions are serialized, and the superclass * takes care of the name. */ private synchronized void writeObject(java.io.ObjectOutputStream s) throws IOException { // Write out the actions. The superclass takes care of the name // call getActions to make sure actions field is initialized if (actions == null) getActions(); s.defaultWriteObject(); } /** * readObject is called to restore the state of the SocketPermission from * a stream. */ private synchronized void readObject(java.io.ObjectInputStream s) throws IOException, ClassNotFoundException { // Read in the action, then initialize the rest s.defaultReadObject(); init(getName(), getMask(actions)); } /** * Check the system/security property for the ephemeral port range * for this system. The suffix is either "high" or "low" */ private static int initEphemeralPorts(String suffix, int defval) { return AccessController.doPrivileged(new PrivilegedAction<>() { public Integer run() { int val = Integer.getInteger("jdk.net.ephemeralPortRange." + suffix, -1); if (val != -1) { return val; } else { return suffix.equals("low") ? PortConfig.getLower() : PortConfig.getUpper(); } } }); } /** * Check if the target range is within the policy range * together with the ephemeral range for this platform * (if policy includes ephemeral range) */ private static boolean inRange(int policyLow, int policyHigh, int targetLow, int targetHigh) { final int ephemeralLow = EphemeralRange.low; final int ephemeralHigh = EphemeralRange.high; if (targetLow == 0) { // check policy includes ephemeral range if (!inRange(policyLow, policyHigh, ephemeralLow, ephemeralHigh)) { return false; } if (targetHigh == 0) { // nothing left to do return true; } // continue check with first real port number targetLow = 1; } if (policyLow == 0 && policyHigh == 0) { // ephemeral range only return targetLow >= ephemeralLow && targetHigh <= ephemeralHigh; } if (policyLow != 0) { // simple check of policy only return targetLow >= policyLow && targetHigh <= policyHigh; } // policyLow == 0 which means possibly two ranges to check // first check if policy and ephem range overlap/contiguous if (policyHigh >= ephemeralLow - 1) { return targetHigh <= ephemeralHigh; } // policy and ephem range do not overlap // target range must lie entirely inside policy range or eph range return (targetLow <= policyHigh && targetHigh <= policyHigh) || (targetLow >= ephemeralLow && targetHigh <= ephemeralHigh); } /* public String toString() { StringBuffer s = new StringBuffer(super.toString() + "\n" + "cname = " + cname + "\n" + "wildcard = " + wildcard + "\n" + "invalid = " + invalid + "\n" + "portrange = " + portrange[0] + "," + portrange[1] + "\n"); if (addresses != null) for (int i=0; i<addresses.length; i++) { s.append( addresses[i].getHostAddress()); s.append("\n"); } else { s.append("(no addresses)\n"); } return s.toString(); } public static void main(String args[]) throws Exception { SocketPermission this_ = new SocketPermission(args[0], "connect"); SocketPermission that_ = new SocketPermission(args[1], "connect"); System.out.println("-----\n"); System.out.println("this.implies(that) = " + this_.implies(that_)); System.out.println("-----\n"); System.out.println("this = "+this_); System.out.println("-----\n"); System.out.println("that = "+that_); System.out.println("-----\n"); SocketPermissionCollection nps = new SocketPermissionCollection(); nps.add(this_); nps.add(new SocketPermission("www-leland.stanford.edu","connect")); nps.add(new SocketPermission("www-example.com","connect")); System.out.println("nps.implies(that) = " + nps.implies(that_)); System.out.println("-----\n"); } */ } /** if (init'd with IP, key is IP as string) if wildcard, its the wild card else its the cname? * * @see java.security.Permission * @see java.security.Permissions * @see java.security.PermissionCollection * * * @author Roland Schemers * * @serial include */ final class SocketPermissionCollection extends PermissionCollection implements Serializable { // Not serialized; see serialization section at end of class // A ConcurrentSkipListMap is used to preserve order, so that most // recently added permissions are checked first (see JDK-4301064). private transient ConcurrentSkipListMap<String, SocketPermission> perms; /** * Create an empty SocketPermissions object. * */ public SocketPermissionCollection() { perms = new ConcurrentSkipListMap<>(new SPCComparator()); } /** * Adds a permission to the SocketPermissions. The key for the hash is * the name in the case of wildcards, or all the IP addresses. * * @param permission the Permission object to add. * * @exception IllegalArgumentException - if the permission is not a * SocketPermission * * @exception SecurityException - if this SocketPermissionCollection object * has been marked readonly */ @Override public void add(Permission permission) { if (!(permission instanceof SocketPermission)) throw new IllegalArgumentException("invalid permission: " + permission); if (isReadOnly()) throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection"); SocketPermission sp = (SocketPermission) permission; // Add permission to map if it is absent, or replace with new // permission if applicable. NOTE: cannot use lambda for // remappingFunction parameter until JDK-8076596 is fixed. perms.merge(sp.getName(), sp, new java.util.function.BiFunction<>() { @Override public SocketPermission apply(SocketPermission existingVal, SocketPermission newVal) { int oldMask = existingVal.getMask(); int newMask = newVal.getMask(); if (oldMask != newMask) { int effective = oldMask | newMask; if (effective == newMask) { return newVal; } if (effective != oldMask) { return new SocketPermission(sp.getName(), effective); } } return existingVal; } }); } /** * Check and see if this collection of permissions implies the permissions * expressed in "permission". * * @param permission the Permission object to compare * * @return true if "permission" is a proper subset of a permission in * the collection, false if not. */ @Override public boolean implies(Permission permission) { if (!(permission instanceof SocketPermission)) return false; SocketPermission np = (SocketPermission) permission; int desired = np.getMask(); int effective = 0; int needed = desired; //System.out.println("implies "+np); for (SocketPermission x : perms.values()) { //System.out.println(" trying "+x); if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(np)) { effective |= x.getMask(); if ((effective & desired) == desired) { return true; } needed = (desired ^ effective); } } return false; } /** * Returns an enumeration of all the SocketPermission objects in the * container. * * @return an enumeration of all the SocketPermission objects. */ @Override @SuppressWarnings("unchecked") public Enumeration<Permission> elements() { return (Enumeration) Collections.enumeration(perms.values()); } private static final long serialVersionUID = 2787186408602843674L; // Need to maintain serialization interoperability with earlier releases, // which had the serializable field: // // The SocketPermissions for this set. // @serial // // private Vector permissions; /** * @serialField permissions java.util.Vector * A list of the SocketPermissions for this set. */ private static final ObjectStreamField[] serialPersistentFields = { new ObjectStreamField("permissions", Vector.class), }; /** * @serialData "permissions" field (a Vector containing the SocketPermissions). */ /* * Writes the contents of the perms field out as a Vector for * serialization compatibility with earlier releases. */ private void writeObject(ObjectOutputStream out) throws IOException { // Don't call out.defaultWriteObject() // Write out Vector Vector<SocketPermission> permissions = new Vector<>(perms.values()); ObjectOutputStream.PutField pfields = out.putFields(); pfields.put("permissions", permissions); out.writeFields(); } /* * Reads in a Vector of SocketPermissions and saves them in the perms field. */ private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { // Don't call in.defaultReadObject() // Read in serialized fields ObjectInputStream.GetField gfields = in.readFields(); // Get the one we want @SuppressWarnings("unchecked") Vector<SocketPermission> permissions = (Vector<SocketPermission>) gfields.get("permissions", null); perms = new ConcurrentSkipListMap<>(new SPCComparator()); for (SocketPermission sp : permissions) { perms.put(sp.getName(), sp); } } /** * A simple comparator that orders new non-equal entries at the beginning. */ private static class SPCComparator implements Comparator<String> { @Override public int compare(String s1, String s2) { if (s1.equals(s2)) { return 0; } return -1; } } }