SecurityConstraint.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.descriptor.web;
import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.HttpConstraintElement;
import javax.servlet.HttpMethodConstraintElement;
import javax.servlet.ServletSecurityElement;
import javax.servlet.annotation.ServletSecurity;
import javax.servlet.annotation.ServletSecurity.EmptyRoleSemantic;
import org.apache.juli.logging.Log;
import org.apache.tomcat.util.res.StringManager;
/**
* Representation of a security constraint element for a web application,
* as represented in a <code><security-constraint></code> element in the
* deployment descriptor.
* <p>
* <b>WARNING</b>: It is assumed that instances of this class will be created
* and modified only within the context of a single thread, before the instance
* is made visible to the remainder of the application. After that, only read
* access is expected. Therefore, none of the read and write access within
* this class is synchronized.
*
* @author Craig R. McClanahan
*/
public class SecurityConstraint extends XmlEncodingBase implements Serializable {
private static final long serialVersionUID = 1L;
public static final String ROLE_ALL_ROLES = "*";
public static final String ROLE_ALL_AUTHENTICATED_USERS = "**";
private static final StringManager sm =
StringManager.getManager(Constants.PACKAGE_NAME);
// ----------------------------------------------------------- Constructors
/**
* Construct a new security constraint instance with default values.
*/
public SecurityConstraint() {
super();
}
// ----------------------------------------------------- Instance Variables
/**
* Was the "all roles" wildcard - {@link #ROLE_ALL_ROLES} - included in the
* authorization constraints for this security constraint?
*/
private boolean allRoles = false;
/**
* Was the "all authenticated users" wildcard -
* {@link #ROLE_ALL_AUTHENTICATED_USERS} - included in the authorization
* constraints for this security constraint?
*/
private boolean authenticatedUsers = false;
/**
* Was an authorization constraint included in this security constraint?
* This is necessary to distinguish the case where an auth-constraint with
* no roles (signifying no direct access at all) was requested, versus
* a lack of auth-constraint which implies no access control checking.
*/
private boolean authConstraint = false;
/**
* The set of roles permitted to access resources protected by this
* security constraint.
*/
private String authRoles[] = new String[0];
/**
* The set of web resource collections protected by this security
* constraint.
*/
private SecurityCollection collections[] = new SecurityCollection[0];
/**
* The display name of this security constraint.
*/
private String displayName = null;
/**
* The user data constraint for this security constraint. Must be NONE,
* INTEGRAL, or CONFIDENTIAL.
*/
private String userConstraint = "NONE";
// ------------------------------------------------------------- Properties
/**
* Was the "all roles" wildcard included in this authentication
* constraint?
* @return <code>true</code> if all roles
*/
public boolean getAllRoles() {
return this.allRoles;
}
/**
* Was the "all authenticated users" wildcard included in this
* authentication constraint?
* @return <code>true</code> if all authenticated users
*/
public boolean getAuthenticatedUsers() {
return this.authenticatedUsers;
}
/**
* Return the authorization constraint present flag for this security
* constraint.
* @return <code>true</code> if this needs authorization
*/
public boolean getAuthConstraint() {
return this.authConstraint;
}
/**
* Set the authorization constraint present flag for this security
* constraint.
* @param authConstraint The new value
*/
public void setAuthConstraint(boolean authConstraint) {
this.authConstraint = authConstraint;
}
/**
* @return the display name of this security constraint.
*/
public String getDisplayName() {
return this.displayName;
}
/**
* Set the display name of this security constraint.
* @param displayName The new value
*/
public void setDisplayName(String displayName) {
this.displayName = displayName;
}
/**
* Return the user data constraint for this security constraint.
* @return the user constraint
*/
public String getUserConstraint() {
return userConstraint;
}
/**
* Set the user data constraint for this security constraint.
*
* @param userConstraint The new user data constraint
*/
public void setUserConstraint(String userConstraint) {
if (userConstraint != null) {
this.userConstraint = userConstraint;
}
}
/**
* Called in the unlikely event that an application defines a role named
* "**".
*/
public void treatAllAuthenticatedUsersAsApplicationRole() {
if (authenticatedUsers) {
authenticatedUsers = false;
String results[] = new String[authRoles.length + 1];
for (int i = 0; i < authRoles.length; i++) {
results[i] = authRoles[i];
}
results[authRoles.length] = ROLE_ALL_AUTHENTICATED_USERS;
authRoles = results;
authConstraint = true;
}
}
// --------------------------------------------------------- Public Methods
/**
* Add an authorization role, which is a role name that will be
* permitted access to the resources protected by this security constraint.
*
* @param authRole Role name to be added
*/
public void addAuthRole(String authRole) {
if (authRole == null) {
return;
}
if (ROLE_ALL_ROLES.equals(authRole)) {
allRoles = true;
return;
}
if (ROLE_ALL_AUTHENTICATED_USERS.equals(authRole)) {
authenticatedUsers = true;
return;
}
String results[] = new String[authRoles.length + 1];
for (int i = 0; i < authRoles.length; i++) {
results[i] = authRoles[i];
}
results[authRoles.length] = authRole;
authRoles = results;
authConstraint = true;
}
@Override
public void setCharset(Charset charset) {
super.setCharset(charset);
for (SecurityCollection collection : collections) {
collection.setCharset(getCharset());
}
}
/**
* Add a new web resource collection to those protected by this
* security constraint.
*
* @param collection The new web resource collection
*/
public void addCollection(SecurityCollection collection) {
if (collection == null) {
return;
}
collection.setCharset(getCharset());
SecurityCollection results[] =
new SecurityCollection[collections.length + 1];
for (int i = 0; i < collections.length; i++) {
results[i] = collections[i];
}
results[collections.length] = collection;
collections = results;
}
/**
* Check a role.
*
* @param role Role name to be checked
* @return <code>true</code> if the specified role is permitted access to
* the resources protected by this security constraint.
*/
public boolean findAuthRole(String role) {
if (role == null) {
return false;
}
for (String authRole : authRoles) {
if (role.equals(authRole)) {
return true;
}
}
return false;
}
/**
* Return the set of roles that are permitted access to the resources
* protected by this security constraint. If none have been defined,
* a zero-length array is returned (which implies that all authenticated
* users are permitted access).
* @return the roles array
*/
public String[] findAuthRoles() {
return authRoles;
}
/**
* Return the web resource collection for the specified name, if any;
* otherwise, return <code>null</code>.
*
* @param name Web resource collection name to return
* @return the collection
*/
public SecurityCollection findCollection(String name) {
if (name == null) {
return null;
}
for (SecurityCollection collection : collections) {
if (name.equals(collection.getName())) {
return collection;
}
}
return null;
}
/**
* Return all of the web resource collections protected by this
* security constraint. If there are none, a zero-length array is
* returned.
* @return the collections array
*/
public SecurityCollection[] findCollections() {
return collections;
}
/**
* Check if the constraint applies to a URI and method.
* @param uri Context-relative URI to check
* @param method Request method being used
* @return <code>true</code> if the specified context-relative URI (and
* associated HTTP method) are protected by this security constraint.
*/
public boolean included(String uri, String method) {
// We cannot match without a valid request method
if (method == null) {
return false;
}
// Check all of the collections included in this constraint
for (SecurityCollection collection : collections) {
if (!collection.findMethod(method)) {
continue;
}
String patterns[] = collection.findPatterns();
for (String pattern : patterns) {
if (matchPattern(uri, pattern)) {
return true;
}
}
}
// No collection included in this constraint matches this request
return false;
}
/**
* Remove the specified role from the set of roles permitted to access
* the resources protected by this security constraint.
*
* @param authRole Role name to be removed
*/
public void removeAuthRole(String authRole) {
if (authRole == null) {
return;
}
if (ROLE_ALL_ROLES.equals(authRole)) {
allRoles = false;
return;
}
if (ROLE_ALL_AUTHENTICATED_USERS.equals(authRole)) {
authenticatedUsers = false;
return;
}
int n = -1;
for (int i = 0; i < authRoles.length; i++) {
if (authRoles[i].equals(authRole)) {
n = i;
break;
}
}
if (n >= 0) {
int j = 0;
String results[] = new String[authRoles.length - 1];
for (int i = 0; i < authRoles.length; i++) {
if (i != n) {
results[j++] = authRoles[i];
}
}
authRoles = results;
}
}
/**
* Remove the specified web resource collection from those protected by
* this security constraint.
*
* @param collection Web resource collection to be removed
*/
public void removeCollection(SecurityCollection collection) {
if (collection == null) {
return;
}
int n = -1;
for (int i = 0; i < collections.length; i++) {
if (collections[i].equals(collection)) {
n = i;
break;
}
}
if (n >= 0) {
int j = 0;
SecurityCollection results[] =
new SecurityCollection[collections.length - 1];
for (int i = 0; i < collections.length; i++) {
if (i != n) {
results[j++] = collections[i];
}
}
collections = results;
}
}
/**
* Return a String representation of this security constraint.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder("SecurityConstraint[");
for (int i = 0; i < collections.length; i++) {
if (i > 0) {
sb.append(", ");
}
sb.append(collections[i].getName());
}
sb.append(']');
return sb.toString();
}
// -------------------------------------------------------- Private Methods
/**
* Does the specified request path match the specified URL pattern?
* This method follows the same rules (in the same order) as those used
* for mapping requests to servlets.
*
* @param path Context-relative request path to be checked
* (must start with '/')
* @param pattern URL pattern to be compared against
*/
private boolean matchPattern(String path, String pattern) {
// Normalize the argument strings
if (path == null || path.length() == 0) {
path = "/";
}
if (pattern == null || pattern.length() == 0) {
pattern = "/";
}
// Check for exact match
if (path.equals(pattern)) {
return true;
}
// Check for path prefix matching
if (pattern.startsWith("/") && pattern.endsWith("/*")) {
pattern = pattern.substring(0, pattern.length() - 2);
if (pattern.length() == 0)
{
return true; // "/*" is the same as "/"
}
if (path.endsWith("/")) {
path = path.substring(0, path.length() - 1);
}
while (true) {
if (pattern.equals(path)) {
return true;
}
int slash = path.lastIndexOf('/');
if (slash <= 0) {
break;
}
path = path.substring(0, slash);
}
return false;
}
// Check for suffix matching
if (pattern.startsWith("*.")) {
int slash = path.lastIndexOf('/');
int period = path.lastIndexOf('.');
if ((slash >= 0) && (period > slash) &&
path.endsWith(pattern.substring(1))) {
return true;
}
return false;
}
// Check for universal mapping
if (pattern.equals("/")) {
return true;
}
return false;
}
/**
* Convert a {@link ServletSecurityElement} to an array of
* {@link SecurityConstraint}(s).
*
* @param element The element to be converted
* @param urlPattern The url pattern that the element should be applied
* to
* @return The (possibly zero length) array of constraints that
* are the equivalent to the input
*/
public static SecurityConstraint[] createConstraints(
ServletSecurityElement element, String urlPattern) {
Set<SecurityConstraint> result = new HashSet<>();
// Add the per method constraints
Collection<HttpMethodConstraintElement> methods =
element.getHttpMethodConstraints();
for (HttpMethodConstraintElement methodElement : methods) {
SecurityConstraint constraint =
createConstraint(methodElement, urlPattern, true);
// There will always be a single collection
SecurityCollection collection = constraint.findCollections()[0];
collection.addMethod(methodElement.getMethodName());
result.add(constraint);
}
// Add the constraint for all the other methods
SecurityConstraint constraint = createConstraint(element, urlPattern, false);
if (constraint != null) {
// There will always be a single collection
SecurityCollection collection = constraint.findCollections()[0];
for (String name : element.getMethodNames()) {
collection.addOmittedMethod(name);
}
result.add(constraint);
}
return result.toArray(new SecurityConstraint[0]);
}
private static SecurityConstraint createConstraint(
HttpConstraintElement element, String urlPattern, boolean alwaysCreate) {
SecurityConstraint constraint = new SecurityConstraint();
SecurityCollection collection = new SecurityCollection();
boolean create = alwaysCreate;
if (element.getTransportGuarantee() !=
ServletSecurity.TransportGuarantee.NONE) {
constraint.setUserConstraint(element.getTransportGuarantee().name());
create = true;
}
if (element.getRolesAllowed().length > 0) {
String[] roles = element.getRolesAllowed();
for (String role : roles) {
constraint.addAuthRole(role);
}
create = true;
}
if (element.getEmptyRoleSemantic() != EmptyRoleSemantic.PERMIT) {
constraint.setAuthConstraint(true);
create = true;
}
if (create) {
collection.addPattern(urlPattern);
constraint.addCollection(collection);
return constraint;
}
return null;
}
public static SecurityConstraint[] findUncoveredHttpMethods(
SecurityConstraint[] constraints,
boolean denyUncoveredHttpMethods, Log log) {
Set<String> coveredPatterns = new HashSet<>();
Map<String,Set<String>> urlMethodMap = new HashMap<>();
Map<String,Set<String>> urlOmittedMethodMap = new HashMap<>();
List<SecurityConstraint> newConstraints = new ArrayList<>();
// First build the lists of covered patterns and those patterns that
// might be uncovered
for (SecurityConstraint constraint : constraints) {
SecurityCollection[] collections = constraint.findCollections();
for (SecurityCollection collection : collections) {
String[] patterns = collection.findPatterns();
String[] methods = collection.findMethods();
String[] omittedMethods = collection.findOmittedMethods();
// Simple case: no methods
if (methods.length == 0 && omittedMethods.length == 0) {
coveredPatterns.addAll(Arrays.asList(patterns));
continue;
}
// Pre-calculate so we don't do this for every iteration of the
// following loop
List<String> omNew = null;
if (omittedMethods.length != 0) {
omNew = Arrays.asList(omittedMethods);
}
// Only need to process uncovered patterns
for (String pattern : patterns) {
if (!coveredPatterns.contains(pattern)) {
if (methods.length == 0) {
// Build the interset of omitted methods for this
// pattern
Set<String> om = urlOmittedMethodMap.get(pattern);
if (om == null) {
om = new HashSet<>();
urlOmittedMethodMap.put(pattern, om);
om.addAll(omNew);
} else {
om.retainAll(omNew);
}
} else {
// Build the union of methods for this pattern
Set<String> m = urlMethodMap.get(pattern);
if (m == null) {
m = new HashSet<>();
urlMethodMap.put(pattern, m);
}
m.addAll(Arrays.asList(methods));
}
}
}
}
}
// Now check the potentially uncovered patterns
for (Map.Entry<String, Set<String>> entry : urlMethodMap.entrySet()) {
String pattern = entry.getKey();
if (coveredPatterns.contains(pattern)) {
// Fully covered. Ignore any partial coverage
urlOmittedMethodMap.remove(pattern);
continue;
}
Set<String> omittedMethods = urlOmittedMethodMap.remove(pattern);
Set<String> methods = entry.getValue();
if (omittedMethods == null) {
StringBuilder msg = new StringBuilder();
for (String method : methods) {
msg.append(method);
msg.append(' ');
}
if (denyUncoveredHttpMethods) {
log.info(sm.getString(
"securityConstraint.uncoveredHttpMethodFix",
pattern, msg.toString().trim()));
SecurityCollection collection = new SecurityCollection();
for (String method : methods) {
collection.addOmittedMethod(method);
}
collection.addPatternDecoded(pattern);
collection.setName("deny-uncovered-http-methods");
SecurityConstraint constraint = new SecurityConstraint();
constraint.setAuthConstraint(true);
constraint.addCollection(collection);
newConstraints.add(constraint);
} else {
log.error(sm.getString(
"securityConstraint.uncoveredHttpMethod",
pattern, msg.toString().trim()));
}
continue;
}
// As long as every omitted method as a corresponding method the
// pattern is fully covered.
omittedMethods.removeAll(methods);
handleOmittedMethods(omittedMethods, pattern, denyUncoveredHttpMethods,
newConstraints, log);
}
for (Map.Entry<String, Set<String>> entry :
urlOmittedMethodMap.entrySet()) {
String pattern = entry.getKey();
if (coveredPatterns.contains(pattern)) {
// Fully covered. Ignore any partial coverage
continue;
}
handleOmittedMethods(entry.getValue(), pattern, denyUncoveredHttpMethods,
newConstraints, log);
}
return newConstraints.toArray(new SecurityConstraint[0]);
}
private static void handleOmittedMethods(Set<String> omittedMethods, String pattern,
boolean denyUncoveredHttpMethods, List<SecurityConstraint> newConstraints, Log log) {
if (omittedMethods.size() > 0) {
StringBuilder msg = new StringBuilder();
for (String method : omittedMethods) {
msg.append(method);
msg.append(' ');
}
if (denyUncoveredHttpMethods) {
log.info(sm.getString(
"securityConstraint.uncoveredHttpOmittedMethodFix",
pattern, msg.toString().trim()));
SecurityCollection collection = new SecurityCollection();
for (String method : omittedMethods) {
collection.addMethod(method);
}
collection.addPatternDecoded(pattern);
collection.setName("deny-uncovered-http-methods");
SecurityConstraint constraint = new SecurityConstraint();
constraint.setAuthConstraint(true);
constraint.addCollection(collection);
newConstraints.add(constraint);
} else {
log.error(sm.getString(
"securityConstraint.uncoveredHttpOmittedMethod",
pattern, msg.toString().trim()));
}
}
}
}