Author: markt
Date: Tue Sep 4 19:48:27 2012
New Revision: 1380829
URL: http://svn.apache.org/viewvc?rev=1380829&view=rev
Log:
Various improvements to the DIGEST authenticator including <bug>52954</bug>,
the disabling caching of an authenticated user in the session by default,
tracking server rather than client nonces and better handling of stale nonce
values.
Modified:
tomcat/tc6.0.x/trunk/java/org/apache/catalina/authenticator/DigestAuthenticator.java
tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml
tomcat/tc6.0.x/trunk/webapps/docs/config/valve.xml
Modified:
tomcat/tc6.0.x/trunk/java/org/apache/catalina/authenticator/DigestAuthenticator.java
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/authenticator/DigestAuthenticator.java?rev=1380829&r1=1380828&r2=1380829&view=diff
==============================================================================
---
tomcat/tc6.0.x/trunk/java/org/apache/catalina/authenticator/DigestAuthenticator.java
(original)
+++
tomcat/tc6.0.x/trunk/java/org/apache/catalina/authenticator/DigestAuthenticator.java
Tue Sep 4 19:48:27 2012
@@ -27,9 +27,9 @@ import java.util.LinkedHashMap;
import java.util.Map;
import java.util.StringTokenizer;
+import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
-
import org.apache.catalina.LifecycleException;
import org.apache.catalina.Realm;
import org.apache.catalina.connector.Request;
@@ -80,6 +80,7 @@ public class DigestAuthenticator extends
public DigestAuthenticator() {
super();
+ setCache(false);
try {
if (md5Helper == null)
md5Helper = MessageDigest.getInstance("MD5");
@@ -100,16 +101,16 @@ public class DigestAuthenticator extends
/**
- * List of client nonce values currently being tracked
+ * List of server nonce values currently being tracked
*/
- protected Map<String,NonceInfo> cnonces;
+ protected Map<String,NonceInfo> nonces;
/**
- * Maximum number of client nonces to keep in the cache. If not specified,
+ * Maximum number of server nonces to keep in the cache. If not specified,
* the default value of 1000 is used.
*/
- protected int cnonceCacheSize = 1000;
+ protected int nonceCacheSize = 1000;
/**
@@ -150,13 +151,13 @@ public class DigestAuthenticator extends
}
- public int getCnonceCacheSize() {
- return cnonceCacheSize;
+ public int getNonceCacheSize() {
+ return nonceCacheSize;
}
- public void setCnonceCacheSize(int cnonceCacheSize) {
- this.cnonceCacheSize = cnonceCacheSize;
+ public void setNonceCacheSize(int nonceCacheSize) {
+ this.nonceCacheSize = nonceCacheSize;
}
@@ -263,18 +264,19 @@ public class DigestAuthenticator extends
// Validate any credentials already included with this request
String authorization = request.getHeader("authorization");
DigestInfo digestInfo = new DigestInfo(getOpaque(), getNonceValidity(),
- getKey(), cnonces, isValidateUri());
+ getKey(), nonces, isValidateUri());
if (authorization != null) {
- if (digestInfo.validate(request, authorization, config)) {
- principal = digestInfo.authenticate(context.getRealm());
- }
+ if (digestInfo.parse(request, authorization)) {
+ if (digestInfo.validate(request, config)) {
+ principal = digestInfo.authenticate(context.getRealm());
+ }
- if (principal != null) {
- String username = parseUsername(authorization);
- register(request, response, principal,
- Constants.DIGEST_METHOD,
- username, null);
- return (true);
+ if (principal != null && !digestInfo.isNonceStale()) {
+ register(request, response, principal,
+ HttpServletRequest.DIGEST_AUTH,
+ digestInfo.getUsername(), null);
+ return true;
+ }
}
}
@@ -285,10 +287,9 @@ public class DigestAuthenticator extends
String nonce = generateNonce(request);
setAuthenticateHeader(request, response, config, nonce,
- digestInfo.isNonceStale());
+ principal != null && digestInfo.isNonceStale());
response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
- // hres.flushBuffer();
- return (false);
+ return false;
}
@@ -301,7 +302,10 @@ public class DigestAuthenticator extends
* can be identified, return <code>null</code>
*
* @param authorization Authorization string to be parsed
+ *
+ * @deprecated Unused. Will be removed in Tomcat 8.0.x
*/
+ @Deprecated
protected String parseUsername(String authorization) {
// Validate the authorization credentials format
@@ -345,7 +349,7 @@ public class DigestAuthenticator extends
} else if (quotedString.length() > 2) {
return quotedString.substring(1, quotedString.length() - 1);
} else {
- return new String();
+ return "";
}
}
@@ -376,7 +380,14 @@ public class DigestAuthenticator extends
buffer = md5Helper.digest(ipTimeKey.getBytes());
}
- return currentTime + ":" + md5Encoder.encode(buffer);
+ String nonce = currentTime + ":" + md5Encoder.encode(buffer);
+
+ NonceInfo info = new NonceInfo(currentTime, 100);
+ synchronized (nonces) {
+ nonces.put(nonce, info);
+ }
+
+ return nonce;
}
@@ -450,7 +461,7 @@ public class DigestAuthenticator extends
setOpaque(generateSessionId());
}
- cnonces = new LinkedHashMap<String, DigestAuthenticator.NonceInfo>() {
+ nonces = new LinkedHashMap<String, DigestAuthenticator.NonceInfo>() {
private static final long serialVersionUID = 1L;
private static final long LOG_SUPPRESS_TIME = 5 * 60 * 1000;
@@ -462,7 +473,7 @@ public class DigestAuthenticator extends
Map.Entry<String,NonceInfo> eldest) {
// This is called from a sync so keep it simple
long currentTime = System.currentTimeMillis();
- if (size() > getCnonceCacheSize()) {
+ if (size() > getNonceCacheSize()) {
if (lastLog < currentTime &&
currentTime - eldest.getValue().getTimestamp() <
getNonceValidity()) {
@@ -480,10 +491,10 @@ public class DigestAuthenticator extends
private static class DigestInfo {
- private String opaque;
- private long nonceValidity;
- private String key;
- private Map<String,NonceInfo> cnonces;
+ private final String opaque;
+ private final long nonceValidity;
+ private final String key;
+ private final Map<String,NonceInfo> nonces;
private boolean validateUri = true;
private String userName = null;
@@ -495,21 +506,27 @@ public class DigestAuthenticator extends
private String cnonce = null;
private String realmName = null;
private String qop = null;
+ private String opaqueReceived = null;
private boolean nonceStale = false;
public DigestInfo(String opaque, long nonceValidity, String key,
- Map<String,NonceInfo> cnonces, boolean validateUri) {
+ Map<String,NonceInfo> nonces, boolean validateUri) {
this.opaque = opaque;
this.nonceValidity = nonceValidity;
this.key = key;
- this.cnonces = cnonces;
+ this.nonces = nonces;
this.validateUri = validateUri;
}
- public boolean validate(Request request, String authorization,
- LoginConfig config) {
+
+ public String getUsername() {
+ return userName;
+ }
+
+
+ public boolean parse(Request request, String authorization) {
// Validate the authorization credentials format
if (authorization == null) {
return false;
@@ -523,7 +540,6 @@ public class DigestAuthenticator extends
String[] tokens =
authorization.split(",(?=(?:[^\"]*\"[^\"]*\")+$)");
method = request.getMethod();
- String opaque = null;
for (int i = 0; i < tokens.length; i++) {
String currentToken = tokens[i];
@@ -555,9 +571,13 @@ public class DigestAuthenticator extends
if ("response".equals(currentTokenName))
response = removeQuotes(currentTokenValue);
if ("opaque".equals(currentTokenName))
- opaque = removeQuotes(currentTokenValue);
+ opaqueReceived = removeQuotes(currentTokenValue);
}
+ return true;
+ }
+
+ public boolean validate(Request request, LoginConfig config) {
if ( (userName == null) || (realmName == null) || (nonce == null)
|| (uri == null) || (response == null) ) {
return false;
@@ -573,7 +593,23 @@ public class DigestAuthenticator extends
uriQuery = request.getRequestURI() + "?" + query;
}
if (!uri.equals(uriQuery)) {
- return false;
+ // Some clients (older Android) use an absolute URI for
+ // DIGEST but a relative URI in the request line.
+ // request. 2.3.5 < fixed Android version <= 4.0.3
+ String host = request.getHeader("host");
+ String scheme = request.getScheme();
+ if (host != null && !uriQuery.startsWith(scheme)) {
+ StringBuilder absolute = new StringBuilder();
+ absolute.append(scheme);
+ absolute.append("://");
+ absolute.append(host);
+ absolute.append(uriQuery);
+ if (!uri.equals(absolute.toString())) {
+ return false;
+ }
+ } else {
+ return false;
+ }
}
}
@@ -587,7 +623,7 @@ public class DigestAuthenticator extends
}
// Validate the opaque string
- if (!this.opaque.equals(opaque)) {
+ if (!opaque.equals(opaqueReceived)) {
return false;
}
@@ -606,7 +642,9 @@ public class DigestAuthenticator extends
long currentTime = System.currentTimeMillis();
if ((currentTime - nonceTime) > nonceValidity) {
nonceStale = true;
- return false;
+ synchronized (nonces) {
+ nonces.remove(nonce);
+ }
}
String serverIpTimeKey =
request.getRemoteAddr() + ":" + nonceTime + ":" + key;
@@ -625,7 +663,7 @@ public class DigestAuthenticator extends
}
// Validate cnonce and nc
- // Check if presence of nc and nonce is consistent with presence
of qop
+ // Check if presence of nc and Cnonce is consistent with presence
of qop
if (qop == null) {
if (cnonce != null || nc != null) {
return false;
@@ -634,7 +672,9 @@ public class DigestAuthenticator extends
if (cnonce == null || nc == null) {
return false;
}
- if (nc.length() != 8) {
+ // RFC 2617 says nc must be 8 digits long. Older Android
clients
+ // use 6. 2.3.5 < fixed Android version <= 4.0.3
+ if (nc.length() < 6 || nc.length() > 8) {
return false;
}
long count;
@@ -644,21 +684,18 @@ public class DigestAuthenticator extends
return false;
}
NonceInfo info;
- synchronized (cnonces) {
- info = cnonces.get(cnonce);
+ synchronized (nonces) {
+ info = nonces.get(nonce);
}
if (info == null) {
- info = new NonceInfo();
+ // Nonce is valid but not in cache. It must have dropped
out
+ // of the cache - force a re-authentication
+ nonceStale = true;
} else {
- if (count <= info.getCount()) {
+ if (!info.nonceCountValid(count)) {
return false;
}
}
- info.setCount(count);
- info.setTimestamp(currentTime);
- synchronized (cnonces) {
- cnonces.put(cnonce, info);
- }
}
return true;
}
@@ -685,19 +722,31 @@ public class DigestAuthenticator extends
}
private static class NonceInfo {
- private volatile long count;
private volatile long timestamp;
-
- public void setCount(long l) {
- count = l;
+ private volatile boolean seen[];
+ private volatile int offset;
+ private volatile int count = 0;
+
+ public NonceInfo(long currentTime, int seenWindowSize) {
+ this.timestamp = currentTime;
+ seen = new boolean[seenWindowSize];
+ offset = seenWindowSize / 2;
}
- public long getCount() {
- return count;
- }
-
- public void setTimestamp(long l) {
- timestamp = l;
+ public synchronized boolean nonceCountValid(long nonceCount) {
+ if ((count - offset) >= nonceCount ||
+ (nonceCount > count - offset + seen.length)) {
+ return false;
+ }
+ int checkIndex = (int) ((nonceCount + offset) % seen.length);
+ if (seen[checkIndex]) {
+ return false;
+ } else {
+ seen[checkIndex] = true;
+ seen[count % seen.length] = false;
+ count++;
+ return true;
+ }
}
public long getTimestamp() {
Modified: tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml?rev=1380829&r1=1380828&r2=1380829&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml Tue Sep 4 19:48:27 2012
@@ -192,6 +192,12 @@
when logging in when session IDs are being encoded as path parameters.
(markt)
</fix>
+ <fix>
+ Various improvements to the DIGEST authenticator including
+ <bug>52954</bug>, the disabling caching of an authenticated user in the
+ session by default, tracking server rather than client nonces and
better
+ handling of stale nonce values. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
Modified: tomcat/tc6.0.x/trunk/webapps/docs/config/valve.xml
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/webapps/docs/config/valve.xml?rev=1380829&r1=1380828&r2=1380829&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/config/valve.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/config/valve.xml Tue Sep 4 19:48:27 2012
@@ -574,6 +574,12 @@
<attributes>
+ <attribute name="cache" required="false">
+ <p>Should we cache authenticated Principals if the request is part of
an
+ HTTP session? If not specified, the default value of <code>false</code>
+ will be used.</p>
+ </attribute>
+
<attribute name="className" required="true">
<p>Java class name of the implementation to use. This MUST be set to
<strong>org.apache.catalina.authenticator.DigestAuthenticator</strong>.</p>
@@ -596,6 +602,32 @@
<code>true</code> will be used.</p>
</attribute>
+ <attribute name="key" required="false">
+ <p>The secret key used by digest authentication. If not set, a secure
+ random value is generated. This should normally only be set when it is
+ necessary to keep key values constant either across server restarts
+ and/or across a cluster.</p>
+ </attribute>
+
+ <attribute name="nonceCacheSize" required="false">
+ <p>To protect against replay attacks, the DIGEST authenticator tracks
+ server nonce and nonce count values. This attribute controls the size
+ of that cache. If not specified, the default value of 1000 is used.</p>
+ </attribute>
+
+ <attribute name="nonceValidity" required="false">
+ <p>The time, in milliseconds, that a server generated nonce will be
+ considered valid for use in authentication. If not specified, the
+ default value of 300000 (5 minutes) will be used.</p>
+ </attribute>
+
+ <attribute name="opaque" required="false">
+ <p>The opaque server string used by digest authentication. If not set,
a
+ random value is generated. This should normally only be set when it is
+ necessary to keep opaque values constant either across server restarts
+ and/or across a cluster.</p>
+ </attribute>
+
<attribute name="securePagesWithPragma" required="false">
<p>Controls the caching of pages that are protected by security
constraints. Setting this to <code>false</code> may help work around
@@ -605,6 +637,14 @@
If not set, the default value of <code>true</code> will be used.</p>
</attribute>
+ <attribute name="validateUri" required="false">
+ <p>Should the URI be validated as required by RFC2617? If not
specified,
+ the default value of <code>true</code> will be used. This should
+ normally only be set when Tomcat is located behind a reverse proxy and
+ the proxy is modifying the URI passed to Tomcat such that DIGEST
+ authentication always fails.</p>
+ </attribute>
+
</attributes>
</subsection>
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