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Posted to dev@tomcat.apache.org by ma...@apache.org on 2016/10/20 11:26:45 UTC

svn commit: r1765802 - in /tomcat/tc8.5.x/trunk: ./ java/org/apache/coyote/http2/ test/org/apache/coyote/http2/ webapps/docs/config/

Author: markt
Date: Thu Oct 20 11:26:45 2016
New Revision: 1765802

URL: http://svn.apache.org/viewvc?rev=1765802&view=rev
Log:
Implement limits for HTTP/2 header size and count

Added:
    tomcat/tc8.5.x/trunk/test/org/apache/coyote/http2/TestHttp2Limits.java
      - copied unchanged from r1765801, tomcat/trunk/test/org/apache/coyote/http2/TestHttp2Limits.java
Modified:
    tomcat/tc8.5.x/trunk/   (props changed)
    tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Constants.java
    tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/HpackDecoder.java
    tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Parser.java
    tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Protocol.java
    tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2UpgradeHandler.java
    tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/LocalStrings.properties
    tomcat/tc8.5.x/trunk/webapps/docs/config/http2.xml

Propchange: tomcat/tc8.5.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Thu Oct 20 11:26:45 2016
@@ -1 +1 @@
-/tomcat/trunk:1734785,1734799,1734845,1734928,1735041,1735044,1735480,1735577,1735597,1735599-1735600,1735615,1736145,1736162,1736209,1736280,1736297,1736299,1736489,1736646,1736703,1736836,1736849,1737104-1737105,1737112,1737117,1737119-1737120,1737155,1737157,1737192,1737280,1737339,1737632,1737664,1737715,1737748,1737785,1737834,1737860,1737903,1737959,1738005,1738007,1738014-1738015,1738018,1738022,1738039,1738043,1738059-1738060,1738147,1738149,1738174-1738175,1738261,1738589,1738623-1738625,1738643,1738816,1738850,1738855,1738946-1738948,1738953-1738954,1738979,1738982,1739079-1739081,1739087,1739113,1739153,1739172,1739176,1739191,1739474,1739726,1739762,1739775,1739814,1739817-1739818,1739975,1740131,1740324,1740465,1740495,1740508-1740509,1740520,1740535,1740707,1740803,1740810,1740969,1740980,1740991,1740997,1741015,1741033,1741036,1741058,1741060,1741080,1741147,1741159,1741164,1741173,1741181,1741190,1741197,1741202,1741208,1741213,1741221,1741225,1741232,1741409,1741501
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+/tomcat/trunk:1734785,1734799,1734845,1734928,1735041,1735044,1735480,1735577,1735597,1735599-1735600,1735615,1736145,1736162,1736209,1736280,1736297,1736299,1736489,1736646,1736703,1736836,1736849,1737104-1737105,1737112,1737117,1737119-1737120,1737155,1737157,1737192,1737280,1737339,1737632,1737664,1737715,1737748,1737785,1737834,1737860,1737903,1737959,1738005,1738007,1738014-1738015,1738018,1738022,1738039,1738043,1738059-1738060,1738147,1738149,1738174-1738175,1738261,1738589,1738623-1738625,1738643,1738816,1738850,1738855,1738946-1738948,1738953-1738954,1738979,1738982,1739079-1739081,1739087,1739113,1739153,1739172,1739176,1739191,1739474,1739726,1739762,1739775,1739814,1739817-1739818,1739975,1740131,1740324,1740465,1740495,1740508-1740509,1740520,1740535,1740707,1740803,1740810,1740969,1740980,1740991,1740997,1741015,1741033,1741036,1741058,1741060,1741080,1741147,1741159,1741164,1741173,1741181,1741190,1741197,1741202,1741208,1741213,1741221,1741225,1741232,1741409,1741501
 ,1741677,1741892,1741896,1741984,1742023,1742042,1742071,1742090,1742093,1742101,1742105,1742111,1742139,1742146,1742148,1742166,1742181,1742184,1742187,1742246,1742248-1742251,1742263-1742264,1742268,1742276,1742369,1742387,1742448,1742509-1742512,1742917,1742919,1742933,1742975-1742976,1742984,1742986,1743019,1743115,1743117,1743124-1743125,1743134,1743425,1743554,1743679,1743696-1743698,1743700-1743701,1744058,1744064-1744065,1744125,1744194,1744229,1744270,1744323,1744432,1744684,1744697,1744705,1744713,1744760,1744786,1745083,1745142-1745143,1745145,1745177,1745179-1745180,1745227,1745248,1745254,1745337,1745467,1745473,1745576,1745735,1745744,1746304,1746306-1746307,1746319,1746327,1746338,1746340-1746341,1746344,1746427,1746441,1746473,1746490,1746492,1746495-1746496,1746499-1746501,1746503-1746507,1746509,1746549,1746551,1746554,1746556,1746558,1746584,1746620,1746649,1746724,1746939,1746989,1747014,1747028,1747035,1747210,1747225,1747234,1747253,1747404,1747506,1747536,1747
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 0,1763370,1763372,1763375,1763377,1763393,1763412,1763430,1763450,1763512,1763516,1763518,1763520,1763529,1763574,1763634-1763635,1763718,1763786,1763798-1763799,1764083,1764425,1764646,1764648-1764649,1764659,1764663,1764682,1764862,1764866-1764867,1764870,1764897,1765133,1765299,1765358,1765439,1765447,1765495,1765502,1765569-1765571,1765579,1765582,1765589-1765590,1765794,1765801

Modified: tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Constants.java
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Constants.java?rev=1765802&r1=1765801&r2=1765802&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Constants.java (original)
+++ tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Constants.java Thu Oct 20 11:26:45 2016
@@ -23,4 +23,8 @@ public class Constants {
 
     // Parsing
     static final int DEFAULT_HEADER_READ_BUFFER_SIZE = 1024;
+
+    // Limits
+    static final int DEFAULT_MAX_HEADER_COUNT = 100;
+    static final int DEFAULT_MAX_HEADER_SIZE = 8 * 1024;
 }

Modified: tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/HpackDecoder.java
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/HpackDecoder.java?rev=1765802&r1=1765801&r2=1765802&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/HpackDecoder.java (original)
+++ tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/HpackDecoder.java Thu Oct 20 11:26:45 2016
@@ -61,6 +61,13 @@ public class HpackDecoder {
      */
     private int maxMemorySize;
 
+    private int maxHeaderCount = Constants.DEFAULT_MAX_HEADER_COUNT;
+    private int maxHeaderSize = Constants.DEFAULT_MAX_HEADER_SIZE;
+
+    private volatile int headerCount = 0;
+    private volatile boolean countedCookie;
+    private volatile int headerSize = 0;
+
     private final StringBuilder stringBuilder = new StringBuilder();
 
     public HpackDecoder(int maxMemorySize) {
@@ -109,7 +116,7 @@ public class HpackDecoder {
                     buffer.position(originalPos);
                     return;
                 }
-                headerEmitter.emitHeader(headerName, headerValue);
+                emitHeader(headerName, headerValue);
                 addEntryToHeaderTable(new Hpack.HeaderField(headerName, headerValue));
             } else if ((b & 0b11110000) == 0) {
                 //Literal Header Field without Indexing
@@ -123,7 +130,7 @@ public class HpackDecoder {
                     buffer.position(originalPos);
                     return;
                 }
-                headerEmitter.emitHeader(headerName, headerValue);
+                emitHeader(headerName, headerValue);
             } else if ((b & 0b11110000) == 0b00010000) {
                 //Literal Header Field never indexed
                 String headerName = readHeaderName(buffer, 4);
@@ -136,7 +143,7 @@ public class HpackDecoder {
                     buffer.position(originalPos);
                     return;
                 }
-                headerEmitter.emitHeader(headerName, headerValue);
+                emitHeader(headerName, headerValue);
             } else if ((b & 0b11100000) == 0b00100000) {
                 //context update max table size change
                 if (!handleMaxMemorySizeChange(buffer, originalPos)) {
@@ -246,7 +253,7 @@ public class HpackDecoder {
         } else {
             int adjustedIndex = getRealIndex(index - Hpack.STATIC_TABLE_LENGTH);
             Hpack.HeaderField headerField = headerTable[adjustedIndex];
-            headerEmitter.emitHeader(headerField.name, headerField.value);
+            emitHeader(headerField.name, headerField.value);
         }
     }
 
@@ -273,7 +280,7 @@ public class HpackDecoder {
         if (entry.value == null) {
             throw new HpackException();
         }
-        headerEmitter.emitHeader(entry.name, entry.value);
+        emitHeader(entry.name, entry.value);
     }
 
     private void addEntryToHeaderTable(Hpack.HeaderField entry) {
@@ -354,10 +361,74 @@ public class HpackDecoder {
         return headerEmitter;
     }
 
-    public void setHeaderEmitter(HeaderEmitter headerEmitter) {
+
+    void setHeaderEmitter(HeaderEmitter headerEmitter) {
         this.headerEmitter = headerEmitter;
+        // Reset limit tracking
+        headerCount = 0;
+        countedCookie = false;
+        headerSize = 0;
+    }
+
+
+    void setMaxHeaderCount(int maxHeaderCount) {
+        this.maxHeaderCount = maxHeaderCount;
+    }
+
+
+    void setMaxHeaderSize(int maxHeaderSize) {
+        this.maxHeaderSize = maxHeaderSize;
+    }
+
+
+    private void emitHeader(String name, String value) {
+        // Header names are forced to lower case
+        if ("cookie".equals(name)) {
+            // Only count the cookie header once since HTTP/2 splits it into
+            // multiple headers to aid compression
+            if (!countedCookie) {
+                headerCount ++;
+                countedCookie = true;
+            }
+        } else {
+            headerCount ++;
+        }
+        // Overhead will vary. The main concern is that lots of small headers
+        // trigger the limiting mechanism correctly. Therefore, use an overhead
+        // estimate of 3 which is the worst case for small headers.
+        int inc = 3 + name.length() + value.length();
+        headerSize += inc;
+        if (!isHeaderCountExceeded() && !isHeaderSizeExceeded(0)) {
+            headerEmitter.emitHeader(name, value);
+        }
     }
 
+
+    boolean isHeaderCountExceeded() {
+        if (maxHeaderCount < 0) {
+            return false;
+        }
+        return headerCount > maxHeaderCount;
+    }
+
+
+    boolean isHeaderSizeExceeded(int unreadSize) {
+        if (maxHeaderSize < 0) {
+            return false;
+        }
+        return (headerSize + unreadSize) > maxHeaderSize;
+    }
+
+
+    boolean isHeaderSwallowSizeExceeded(int unreadSize) {
+        if (maxHeaderSize < 0) {
+            return false;
+        }
+        // Swallow the same again before closing the connection.
+        return (headerSize + unreadSize) > (2 * maxHeaderSize);
+    }
+
+
     //package private fields for unit tests
 
     int getFirstSlotPosition() {

Modified: tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Parser.java
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Parser.java?rev=1765802&r1=1765801&r2=1765802&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Parser.java (original)
+++ tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Parser.java Thu Oct 20 11:26:45 2016
@@ -45,7 +45,7 @@ class Http2Parser {
             ByteBuffer.allocate(Constants.DEFAULT_HEADER_READ_BUFFER_SIZE);
     private volatile int headersCurrentStream = -1;
     private volatile boolean headersEndStream = false;
-
+    private volatile boolean streamReset = false;
 
     Http2Parser(String connectionId, Input input, Output output) {
         this.connectionId = connectionId;
@@ -243,7 +243,7 @@ class Http2Parser {
             payloadSize -= padLength;
         }
 
-        readHeaderPayload(payloadSize);
+        readHeaderPayload(streamId, payloadSize);
 
         swallow(streamId, padLength, true);
 
@@ -371,7 +371,7 @@ class Http2Parser {
                     Integer.toString(streamId)), Http2Error.PROTOCOL_ERROR);
         }
 
-        readHeaderPayload(payloadSize);
+        readHeaderPayload(streamId, payloadSize);
 
         if (Flags.isEndOfHeaders(flags)) {
             onHeadersComplete(streamId);
@@ -380,7 +380,13 @@ class Http2Parser {
     }
 
 
-    private void readHeaderPayload(int payloadSize) throws Http2Exception, IOException {
+    private void readHeaderPayload(int streamId, int payloadSize)
+            throws Http2Exception, IOException {
+
+        if (log.isDebugEnabled()) {
+            log.debug(sm.getString("http2Parser.processFrameHeaders.payload", connectionId,
+                    Integer.valueOf(streamId), Integer.valueOf(payloadSize)));
+        }
 
         int remaining = payloadSize;
 
@@ -411,9 +417,27 @@ class Http2Parser {
                         sm.getString("http2Parser.processFrameHeaders.decodingFailed"),
                         Http2Error.COMPRESSION_ERROR);
             }
+
             // switches to write mode
             headerReadBuffer.compact();
             remaining -= toRead;
+
+            if (hpackDecoder.isHeaderCountExceeded() && !streamReset) {
+                streamReset = true;
+                throw new StreamException(sm.getString("http2Parser.headerLimitCount", connectionId,
+                        Integer.valueOf(streamId)), Http2Error.ENHANCE_YOUR_CALM, streamId);
+            }
+
+            if (hpackDecoder.isHeaderSizeExceeded(headerReadBuffer.position()) && !streamReset) {
+                streamReset = true;
+                throw new StreamException(sm.getString("http2Parser.headerLimitSize", connectionId,
+                        Integer.valueOf(streamId)), Http2Error.ENHANCE_YOUR_CALM, streamId);
+            }
+
+            if (hpackDecoder.isHeaderSwallowSizeExceeded(headerReadBuffer.position())) {
+                throw new ConnectionException(sm.getString("http2Parser.headerLimitSize",
+                        connectionId, Integer.valueOf(streamId)), Http2Error.ENHANCE_YOUR_CALM);
+            }
         }
 
         hpackDecoder.getHeaderEmitter().validateHeaders();
@@ -439,6 +463,11 @@ class Http2Parser {
         if (headerReadBuffer.capacity() > Constants.DEFAULT_HEADER_READ_BUFFER_SIZE) {
             headerReadBuffer = ByteBuffer.allocate(Constants.DEFAULT_HEADER_READ_BUFFER_SIZE);
         }
+
+        // Clear the 'stream has been reset' flag, if set
+        if (streamReset) {
+            streamReset = false;
+        }
     }
 
 

Modified: tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Protocol.java
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Protocol.java?rev=1765802&r1=1765801&r2=1765802&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Protocol.java (original)
+++ tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2Protocol.java Thu Oct 20 11:26:45 2016
@@ -61,8 +61,11 @@ public class Http2Protocol implements Up
     // If a lower initial value is required, set it here but DO NOT change the
     // default defined above.
     private int initialWindowSize = DEFAULT_INITIAL_WINDOW_SIZE;
+    // Limits
     private Set<String> allowedTrailerHeaders =
             Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>());
+    private int maxHeaderCount = Constants.DEFAULT_MAX_HEADER_COUNT;
+    private int maxHeaderSize = Constants.DEFAULT_MAX_HEADER_SIZE;
 
 
     @Override
@@ -104,6 +107,8 @@ public class Http2Protocol implements Up
         result.setMaxConcurrentStreamExecution(getMaxConcurrentStreamExecution());
         result.setInitialWindowSize(getInitialWindowSize());
         result.setAllowedTrailerHeaders(allowedTrailerHeaders);
+        result.setMaxHeaderCount(getMaxHeaderCount());
+        result.setMaxHeaderSize(getMaxHeaderSize());
         return result;
     }
 
@@ -227,4 +232,24 @@ public class Http2Protocol implements Up
         }
         return result.toString();
     }
+
+
+    public void setMaxHeaderCount(int maxHeaderCount) {
+        this.maxHeaderCount = maxHeaderCount;
+    }
+
+
+    public int getMaxHeaderCount() {
+        return maxHeaderCount;
+    }
+
+
+    public void setMaxHeaderSize(int maxHeaderSize) {
+        this.maxHeaderSize = maxHeaderSize;
+    }
+
+
+    public int getMaxHeaderSize() {
+        return maxHeaderSize;
+    }
 }

Modified: tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2UpgradeHandler.java
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2UpgradeHandler.java?rev=1765802&r1=1765801&r2=1765802&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2UpgradeHandler.java (original)
+++ tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/Http2UpgradeHandler.java Thu Oct 20 11:26:45 2016
@@ -1118,6 +1118,16 @@ public class Http2UpgradeHandler extends
     }
 
 
+    public void setMaxHeaderCount(int maxHeaderCount) {
+        getHpackDecoder().setMaxHeaderCount(maxHeaderCount);
+    }
+
+
+    public void setMaxHeaderSize(int maxHeaderSize) {
+        getHpackDecoder().setMaxHeaderSize(maxHeaderSize);
+    }
+
+
     // ----------------------------------------------- Http2Parser.Input methods
 
     @Override

Modified: tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/LocalStrings.properties
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/LocalStrings.properties?rev=1765802&r1=1765801&r2=1765802&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/LocalStrings.properties (original)
+++ tomcat/tc8.5.x/trunk/java/org/apache/coyote/http2/LocalStrings.properties Thu Oct 20 11:26:45 2016
@@ -39,6 +39,8 @@ hpackEncoder.encodeHeader=Encoding heade
 
 hpackhuffman.huffmanEncodedHpackValueDidNotEndWithEOS=Huffman encoded value in HPACK headers did not end with EOS padding
 
+http2Parser.headerLimitCount=Connection [{0}], Stream [{1}], Too many headers
+http2Parser.headerLimitSize=Connection [{0}], Stream [{1}], Total header size too big
 http2Parser.headers.wrongFrameType=Connection [{0}], headers in progress for stream [{1}] but a frame of type [{2}] was received
 http2Parser.headers.wrongStream=Connection [{0}], headers in progress for stream [{1}] but a frame for stream [{2}] was received
 http2Parser.nonZeroPadding=Connection [{0}], Stream [{1}], Non-zero padding received
@@ -53,6 +55,7 @@ http2Parser.processFrameData.lengths=Con
 http2Parser.processFrameGoaway.payloadTooSmall=Connection [{0}]: Goaway payload size was [{1}] which is less than the minimum 8
 http2Parser.processFrameHeaders.decodingFailed=There was an error during the HPACK decoding of HTTP headers
 http2Parser.processFrameHeaders.decodingDataLeft=Data left over after HPACK decoding - it should have been consumed
+http2Parser.processFrameHeaders.payload=Connection [{0}], Stream [{1}], Processing headers payload size [{2}]
 http2Parser.processFramePing.invalidPayloadSize=Settings frame received with an invalid payload size of [{0}] (should be 8)
 http2Parser.processFramePriority.invalidParent=Connection [{0}], Stream [{1}], A stream may not depend on itself
 http2Parser.processFramePriority.invalidPayloadSize=Priority frame received with an invalid payload size of [{0}] (should be 5)

Modified: tomcat/tc8.5.x/trunk/webapps/docs/config/http2.xml
URL: http://svn.apache.org/viewvc/tomcat/tc8.5.x/trunk/webapps/docs/config/http2.xml?rev=1765802&r1=1765801&r2=1765802&view=diff
==============================================================================
--- tomcat/tc8.5.x/trunk/webapps/docs/config/http2.xml (original)
+++ tomcat/tc8.5.x/trunk/webapps/docs/config/http2.xml Thu Oct 20 11:26:45 2016
@@ -105,6 +105,23 @@
       If not specified, the default value of <code>200</code> will be used.</p>
     </attribute>
 
+    <attribute name="maxHeaderCount" required="false">
+      <p>The maximum number of headers in a request that is allowed by the
+      container. A request that contains more headers than the specified limit
+      will be rejected. A value of less than 0 means no limit.
+      If not specified, a default of 100 is used.</p>
+    </attribute>
+
+    <attribute name="maxHeaderSize" required="false">
+      <p>The maximum total size for all headers in a request that is allowed by
+      the container. Total size for a header is calculated as the uncompressed
+      size of the header name in bytes, plus the uncompressed size of the header
+      value in bytes plus an HTTP/2 overhead of 3 bytes per header. A request
+      that contains a set of headers that requires more than the specified limit
+      will be rejected. A value of less than 0 means no limit. If not specified,
+      a default of 8192 is used.</p>
+    </attribute>
+
     <attribute name="readTimeout" required="false">
       <p>The time, in milliseconds, that Tomcat will wait for additional data
       when a partial HTTP/2 frame has been received. Negative values will be



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