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1   /*
2    * Copyright 2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.ws.soap.security.xwss.callback;
18  
19  import java.text.ParseException;
20  import java.text.SimpleDateFormat;
21  import java.util.Calendar;
22  import java.util.Date;
23  import java.util.GregorianCalendar;
24  
25  import com.sun.xml.wss.impl.callback.TimestampValidationCallback;
26  
27  /**
28   * A default implementation of a <code>TimestampValidationCallback.TimestampValidator</code>. Based on a version found
29   * in the JWSDP samples.
30   *
31   * @author Arjen Poutsma
32   * @since 1.0.0
33   */
34  public class DefaultTimestampValidator implements TimestampValidationCallback.TimestampValidator {
35  
36      public void validate(TimestampValidationCallback.Request request)
37              throws TimestampValidationCallback.TimestampValidationException {
38          if (request instanceof TimestampValidationCallback.UTCTimestampRequest) {
39              TimestampValidationCallback.UTCTimestampRequest utcRequest =
40                      (TimestampValidationCallback.UTCTimestampRequest) request;
41              Date created = parseDate(utcRequest.getCreated());
42  
43              validateCreationTime(created, utcRequest.getMaxClockSkew(), utcRequest.getTimestampFreshnessLimit());
44  
45              if (utcRequest.getExpired() != null) {
46                  Date expired = parseDate(utcRequest.getExpired());
47                  validateExpirationTime(expired, utcRequest.getMaxClockSkew());
48              }
49          }
50          else {
51              throw new TimestampValidationCallback.TimestampValidationException("Unsupport request: [" + request + "]");
52          }
53      }
54  
55      private Date getFreshnessAndSkewAdjustedDate(long maxClockSkew, long timestampFreshnessLimit) {
56          Calendar c = new GregorianCalendar();
57          long offset = c.get(Calendar.ZONE_OFFSET);
58          if (c.getTimeZone().inDaylightTime(c.getTime())) {
59              offset += c.getTimeZone().getDSTSavings();
60          }
61          long beforeTime = c.getTimeInMillis();
62          long currentTime = beforeTime - offset;
63  
64          long adjustedTime = currentTime - maxClockSkew - timestampFreshnessLimit;
65          c.setTimeInMillis(adjustedTime);
66  
67          return c.getTime();
68      }
69  
70      private Date getGMTDateWithSkewAdjusted(Calendar calendar, long maxClockSkew, boolean addSkew) {
71          long offset = calendar.get(Calendar.ZONE_OFFSET);
72          if (calendar.getTimeZone().inDaylightTime(calendar.getTime())) {
73              offset += calendar.getTimeZone().getDSTSavings();
74          }
75          long beforeTime = calendar.getTimeInMillis();
76          long currentTime = beforeTime - offset;
77  
78          if (addSkew) {
79              currentTime = currentTime + maxClockSkew;
80          }
81          else {
82              currentTime = currentTime - maxClockSkew;
83          }
84  
85          calendar.setTimeInMillis(currentTime);
86          return calendar.getTime();
87      }
88  
89      private Date parseDate(String date) throws TimestampValidationCallback.TimestampValidationException {
90          SimpleDateFormat calendarFormatter1 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
91          SimpleDateFormat calendarFormatter2 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'.'SSS'Z'");
92  
93          try {
94              try {
95                  return calendarFormatter1.parse(date);
96              }
97              catch (ParseException ignored) {
98                  return calendarFormatter2.parse(date);
99              }
100         }
101         catch (ParseException ex) {
102             throw new TimestampValidationCallback.TimestampValidationException("Could not parse request date: " + date,
103                     ex);
104         }
105     }
106 
107     private void validateCreationTime(Date created, long maxClockSkew, long timestampFreshnessLimit)
108             throws TimestampValidationCallback.TimestampValidationException {
109         Date current = getFreshnessAndSkewAdjustedDate(maxClockSkew, timestampFreshnessLimit);
110 
111         if (created.before(current)) {
112             throw new TimestampValidationCallback.TimestampValidationException(
113                     "The creation time is older than  currenttime - timestamp-freshness-limit - max-clock-skew");
114         }
115 
116         Date currentTime = getGMTDateWithSkewAdjusted(new GregorianCalendar(), maxClockSkew, true);
117         if (currentTime.before(created)) {
118             throw new TimestampValidationCallback.TimestampValidationException(
119                     "The creation time is ahead of the current time.");
120         }
121     }
122 
123     private void validateExpirationTime(Date expires, long maxClockSkew)
124             throws TimestampValidationCallback.TimestampValidationException {
125         Date currentTime = getGMTDateWithSkewAdjusted(new GregorianCalendar(), maxClockSkew, false);
126         if (expires.before(currentTime)) {
127             throw new TimestampValidationCallback.TimestampValidationException(
128                     "The current time is ahead of the expiration time in Timestamp");
129         }
130     }
131 
132 }