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+++ knox/site/books/knox-1-3-0/knoxsso_integration.html Wed Jan 2 17:31:29 2019
@@ -0,0 +1,571 @@
+<h1>Knox SSO Integration for UIs</h1>
+<h2>Introduction</h2>
+<p>KnoxSSO provides an abstraction for integrating any number of
authentication systems and SSO solutions and enables participating web
applications to scale to those solutions more easily. Without the token
exchange capabilities offered by KnoxSSO each component UI would need to
integrate with each desired solution on its own. </p>
+<p>This document examines the way to integrate with Knox SSO in the form of a
Servlet Filter. This approach should be easily extrapolated into other
frameworks - ie. Spring Security.</p>
+<h3><a id="General+Flow">General Flow</a> <a href="#General+Flow"><img
src="markbook-section-link.png"/></a></h3>
+<p>The following is a generic sequence diagram for SAML integration through
KnoxSSO.</p>
+<img src='general_saml_flow.png'/>
+<h4><a id="KnoxSSO+Setup">KnoxSSO Setup</a> <a href="#KnoxSSO+Setup"><img
src="markbook-section-link.png"/></a></h4>
+<h5><a id="knoxsso.xml+Topology">knoxsso.xml Topology</a> <a
href="#knoxsso.xml+Topology"><img src="markbook-section-link.png"/></a></h5>
+<p>In order to enable KnoxSSO, we need to configure the IdP topology. The
following is an example of this topology that is configured to use HTTP Basic
Auth against the Knox Demo LDAP server. This is the lowest barrier of entry for
your development environment that actually authenticates against a real user
store. Whatâs great is if you work against the IdP with Basic Auth then you
will work with SAML or anything else as well.</p>
+<pre><code> <?xml version="1.0"
encoding="utf-8"?>
+ <topology>
+ <gateway>
+ <provider>
+ <role>authentication</role>
+ <name>ShiroProvider</name>
+ <enabled>true</enabled>
+ <param>
+ <name>sessionTimeout</name>
+ <value>30</value>
+ </param>
+ <param>
+ <name>main.ldapRealm</name>
+
<value>org.apache.knox.gateway.shirorealm.KnoxLdapRealm</value>
+ </param>
+ <param>
+ <name>main.ldapContextFactory</name>
+
<value>org.apache.knox.gateway.shirorealm.KnoxLdapContextFactory</value>
+ </param>
+ <param>
+
<name>main.ldapRealm.contextFactory</name>
+ <value>$ldapContextFactory</value>
+ </param>
+ <param>
+
<name>main.ldapRealm.userDnTemplate</name>
+
<value>uid={0},ou=people,dc=hadoop,dc=apache,dc=org</value>
+ </param>
+ <param>
+
<name>main.ldapRealm.contextFactory.url</name>
+
<value>ldap://localhost:33389</value>
+ </param>
+ <param>
+
<name>main.ldapRealm.contextFactory.authenticationMechanism</name>
+ <value>simple</value>
+ </param>
+ <param>
+ <name>urls./**</name>
+ <value>authcBasic</value>
+ </param>
+ </provider>
+ <provider>
+ <role>identity-assertion</role>
+ <name>Default</name>
+ <enabled>true</enabled>
+ </provider>
+ </gateway>
+ <service>
+ <role>KNOXSSO</role>
+ <param>
+
<name>knoxsso.cookie.secure.only</name>
+ <value>true</value>
+ </param>
+ <param>
+ <name>knoxsso.token.ttl</name>
+ <value>100000</value>
+ </param>
+ </service>
+ </topology>
+</code></pre>
+<p>Just as with any Knox service, the KNOXSSO service is protected by the
gateway providers defined above it. In this case, the ShiroProvider is taking
care of HTTP Basic Auth against LDAP for us. Once the user authenticates the
request processing continues to the KNOXSSO service that will create the
required cookie and do the necessary redirects.</p>
+<p>The authenticate/federation provider can be swapped out to fit your
deployment environment.</p>
+<h5><a id="sandbox.xml+Topology">sandbox.xml Topology</a> <a
href="#sandbox.xml+Topology"><img src="markbook-section-link.png"/></a></h5>
+<p>In order to see the end to end story and use it as an example in your
development, you can configure one of the cluster topologies to use the
SSOCookieProvider instead of the out of the box ShiroProvider. The following is
an example sandbox.xml topology that is configured for using KnoxSSO to protect
access to the Hadoop REST APIs.</p>
+<pre><code> <?xml version="1.0" encoding="utf-8"?>
+<topology>
+ <gateway>
+ <provider>
+ <role>federation</role>
+ <name>SSOCookieProvider</name>
+ <enabled>true</enabled>
+ <param>
+ <name>sso.authentication.provider.url</name>
+
<value>https://localhost:9443/gateway/idp/api/v1/websso</value>
+ </param>
+ </provider>
+ <provider>
+ <role>identity-assertion</role>
+ <name>Default</name>
+ <enabled>true</enabled>
+ </provider>
+ </gateway>
+ <service>
+ <role>NAMENODE</role>
+ <url>hdfs://localhost:8020</url>
+ </service>
+ <service>
+ <role>JOBTRACKER</role>
+ <url>rpc://localhost:8050</url>
+ </service>
+ <service>
+ <role>WEBHDFS</role>
+ <url>http://localhost:50070/webhdfs</url>
+ </service>
+ <service>
+ <role>WEBHCAT</role>
+ <url>http://localhost:50111/templeton</url>
+ </service>
+ <service>
+ <role>OOZIE</role>
+ <url>http://localhost:11000/oozie</url>
+ </service>
+ <service>
+ <role>WEBHBASE</role>
+ <url>http://localhost:60080</url>
+ </service>
+ <service>
+ <role>HIVE</role>
+ <url>http://localhost:10001/cliservice</url>
+ </service>
+ <service>
+ <role>RESOURCEMANAGER</role>
+ <url>http://localhost:8088/ws</url>
+ </service>
+</topology>
+</code></pre>
+<ul>
+ <li>NOTE: Be aware that when using Chrome as your browser that cookies
donât seem to work for âlocalhostâ. Either use a VM or like I did - use
127.0.0.1. Safari works with localhost without problems.</li>
+</ul>
+<p>As you can see above, the only thing being configured is the SSO provider
URL. Since Knox is the issuer of the cookie and token, we donât need to
configure the public key since we have programmatic access to the actual
keystore for use at verification time.</p>
+<h4><a id="Curl+the+Flow">Curl the Flow</a> <a href="#Curl+the+Flow"><img
src="markbook-section-link.png"/></a></h4>
+<p>We should now be able to walk through the SSO Flow at the command line with
curl to see everything that happens.</p>
+<p>First, issue a request to WEBHDFS through knox.</p>
+<pre><code> bash-3.2$ curl -iku guest:guest-password
https://localhost:8443/gateway/sandbox/webhdfs/v1/tmp?op+LISTSTATUS
+
+ HTTP/1.1 302 Found
+ Location:
https://localhost:8443/gateway/idp/api/v1/websso?originalUrl=https://localhost:8443/gateway/sandbox/webhdfs/v1/tmp?op+LISTSTATUS
+ Content-Length: 0
+ Server: Jetty(8.1.14.v20131031)
+</code></pre>
+<p>Note the redirect to the knoxsso endpoint and the loginUrl with the
originalUrl request parameter. We need to see that come from your integration
as well.</p>
+<p>Letâs manually follow that redirect with curl now:</p>
+<pre><code> bash-3.2$ curl -iku guest:guest-password
"https://localhost:8443/gateway/idp/api/v1/websso?originalUrl=https://localhost:9443/gateway/sandbox/webhdfs/v1/tmp?op=LISTSTATUS"
+
+ HTTP/1.1 307 Temporary Redirect
+ Set-Cookie:
JSESSIONID=mlkda4crv7z01jd0q0668nsxp;Path=/gateway/idp;Secure;HttpOnly
+ Set-Cookie:
hadoop-jwt=eyJhbGciOiJSUzI1NiJ9.eyJleHAiOjE0NDM1ODUzNzEsInN1YiI6Imd1ZXN0IiwiYXVkIjoiSFNTTyIsImlzcyI6IkhTU08ifQ.RpA84Qdr6RxEZjg21PyVCk0G1kogvkuJI2bo302bpwbvmc-i01gCwKNeoGYzUW27MBXf6a40vylHVR3aZuuBUxsJW3aa_ltrx0R5ztKKnTWeJedOqvFKSrVlBzJJ90PzmDKCqJxA7JUhyo800_lDHLTcDWOiY-ueWYV2RMlCO0w;Path=/;Domain=localhost;Secure;HttpOnly
+ Expires: Thu, 01 Jan 1970 00:00:00 GMT
+ Location:
https://localhost:8443/gateway/sandbox/webhdfs/v1/tmp?op=LISTSTATUS
+ Content-Length: 0
+ Server: Jetty(8.1.14.v20131031)
+</code></pre>
+<p>Note the redirect back to the original URL in the Location header and the
Set-Cookie for the hadoop-jwt cookie. This is what the SSOCookieProvider in
sandbox (and ultimately in your integration) will be looking for.</p>
+<p>Finally, we should be able to take the above cookie and pass it to the
original url as indicated in the Location header for our originally requested
resource:</p>
+<pre><code> bash-3.2$ curl -ikH "Cookie:
hadoop-jwt=eyJhbGciOiJSUzI1NiJ9.eyJleHAiOjE0NDM1ODY2OTIsInN1YiI6Imd1ZXN0IiwiYXVkIjoiSFNTTyIsImlzcyI6IkhTU08ifQ.Os5HEfVBYiOIVNLRIvpYyjeLgAIMbBGXHBWMVRAEdiYcNlJRcbJJ5aSUl1aciNs1zd_SHijfB9gOdwnlvQ_0BCeGHlJBzHGyxeypIoGj9aOwEf36h-HVgqzGlBLYUk40gWAQk3aRehpIrHZT2hHm8Pu8W-zJCAwUd8HR3y6LF3M;Path=/;Domain=localhost;Secure;HttpOnly"
https://localhost:9443/gateway/sandbox/webhdfs/v1/tmp?op=LISTSTATUS
+
+ TODO: cluster was down and needs to be recreated :/
+</code></pre>
+<h4><a id="Browse+the+Flow">Browse the Flow</a> <a
href="#Browse+the+Flow"><img src="markbook-section-link.png"/></a></h4>
+<p>At this point, we can use a web browser instead of the command line and see
how the browser will challenge the user for Basic Auth Credentials and then
manage the cookies such that the SSO and token exchange aspects of the flow are
hidden from the user.</p>
+<p>Simply, try to invoke the same webhdfs API from the browser URL bar.</p>
+<pre><code>
https://localhost:8443/gateway/sandbox/webhdfs/v1/tmp?op=LISTSTATUS
+</code></pre>
+<p>Based on our understanding of the flow it should behave like:</p>
+<ul>
+ <li>SSOCookieProvider checks for hadoop-jwt cookie and in its absence
redirects to the configured SSO provider URL (knoxsso endpoint)</li>
+ <li>ShiroProvider on the KnoxSSO endpoint returns a 401 and the browser
challenges the user for username/password</li>
+ <li>The ShiroProvider authenticates the user against the Demo LDAP Server
using a simple LDAP bind and establishes the security context for the WebSSO
request</li>
+ <li>The WebSSO service exchanges the normalized Java Subject into a JWT
token and sets it on the response as a cookie named hadoop-jwt</li>
+ <li>The WebSSO service then redirects the user agent back to the originally
requested URL - the webhdfs Knox service subsequent invocations will find the
cookie in the incoming request and not need to engage the WebSSO service again
until it expires.</li>
+</ul>
+<h4><a id="Filter+by+Example">Filter by Example</a> <a
href="#Filter+by+Example"><img src="markbook-section-link.png"/></a></h4>
+<p>We have added a federation provider to Knox for accepting KnoxSSO cookies
for REST APIs. This provides us with a couple benefits: KnoxSSO support for
REST APIs for XmlHttpRequests from JavaScript (basic CORS functionality is also
included). This is still rather basic and considered beta code. A model and
real world usecase for others to base their integrations on</p>
+<p>In addition, <a
href="https://issues.apache.org/jira/browse/HADOOP-11717";>https://issues.apache.org/jira/browse/HADOOP-11717</a>
added support for the Hadoop UIs to the hadoop-auth module and it can be used
as another example.</p>
+<p>We will examine the new SSOCookieFederationFilter in Knox here.</p>
+<pre><code>package org.apache.knox.gateway.provider.federation.jwt.filter;
+
+ import java.io.IOException;
+ import java.security.Principal;
+ import java.security.PrivilegedActionException;
+ import java.security.PrivilegedExceptionAction;
+ import java.util.ArrayList;
+ import java.util.Date;
+ import java.util.HashSet;
+ import java.util.List;
+ import java.util.Set;
+
+ import javax.security.auth.Subject;
+ import javax.servlet.Filter;
+ import javax.servlet.FilterChain;
+ import javax.servlet.FilterConfig;
+ import javax.servlet.ServletException;
+ import javax.servlet.ServletRequest;
+ import javax.servlet.ServletResponse;
+ import javax.servlet.http.Cookie;
+ import javax.servlet.http.HttpServletRequest;
+ import javax.servlet.http.HttpServletResponse;
+
+ import org.apache.knox.gateway.i18n.messages.MessagesFactory;
+ import
org.apache.knox.gateway.provider.federation.jwt.JWTMessages;
+ import org.apache.knox.gateway.security.PrimaryPrincipal;
+ import org.apache.knox.gateway.services.GatewayServices;
+ import
org.apache.knox.gateway.services.security.token.JWTokenAuthority;
+ import
org.apache.knox.gateway.services.security.token.TokenServiceException;
+ import
org.apache.knox.gateway.services.security.token.impl.JWTToken;
+
+ public class SSOCookieFederationFilter implements Filter {
+ private static JWTMessages log = MessagesFactory.get(
JWTMessages.class );
+ private static final String ORIGINAL_URL_QUERY_PARAM =
"originalUrl=";
+ private static final String SSO_COOKIE_NAME =
"sso.cookie.name";
+ private static final String SSO_EXPECTED_AUDIENCES =
"sso.expected.audiences";
+ private static final String SSO_AUTHENTICATION_PROVIDER_URL =
"sso.authentication.provider.url";
+ private static final String DEFAULT_SSO_COOKIE_NAME =
"hadoop-jwt";
+</code></pre>
+<p>The above represent the configurable aspects of the integration</p>
+<pre><code> private JWTokenAuthority authority = null;
+ private String cookieName = null;
+ private List<String> audiences = null;
+ private String authenticationProviderUrl = null;
+
+ @Override
+ public void init( FilterConfig filterConfig ) throws ServletException {
+ GatewayServices services = (GatewayServices)
filterConfig.getServletContext().getAttribute(GatewayServices.GATEWAY_SERVICES_ATTRIBUTE);
+ authority =
(JWTokenAuthority)services.getService(GatewayServices.TOKEN_SERVICE);
+</code></pre>
+<p>The above is a Knox specific internal service that we use to issue and
verify JWT tokens. This will be covered separately and you will need to be
implement something similar in your filter implementation.</p>
+<pre><code> // configured cookieName
+ cookieName = filterConfig.getInitParameter(SSO_COOKIE_NAME);
+ if (cookieName == null) {
+ cookieName = DEFAULT_SSO_COOKIE_NAME;
+ }
+</code></pre>
+<p>The configurable cookie name is something that can be used to change a
cookie name to fit your deployment environment. The default name is hadoop-jwt
which is also the default in the Hadoop implementation. This name must match
the name being used by the KnoxSSO endpoint when setting the cookie.</p>
+<pre><code> // expected audiences or null
+ String expectedAudiences =
filterConfig.getInitParameter(SSO_EXPECTED_AUDIENCES);
+ if (expectedAudiences != null) {
+ audiences = parseExpectedAudiences(expectedAudiences);
+ }
+</code></pre>
+<p>Audiences are configured as a comma separated list of audience strings.
Names of intended recipients or intents. The semantics that we are using for
this processing is that - if not configured than any (or none) audience is
accepted. If there are audiences configured then as long as one of the expected
ones is found in the set of claims in the token it is accepted.</p>
+<pre><code> // url to SSO authentication provider
+ authenticationProviderUrl =
filterConfig.getInitParameter(SSO_AUTHENTICATION_PROVIDER_URL);
+ if (authenticationProviderUrl == null) {
+ log.missingAuthenticationProviderUrlConfiguration();
+ }
+ }
+</code></pre>
+<p>This is the URL to the KnoxSSO endpoint. It is required and SSO/token
exchange will not work without this set correctly.</p>
+<pre><code> /**
+ * @param expectedAudiences
+ * @return
+ */
+ private List<String> parseExpectedAudiences(String
expectedAudiences) {
+ ArrayList<String> audList = null;
+ // setup the list of valid audiences for token validation
+ if (expectedAudiences != null) {
+ // parse into the list
+ String[] audArray = expectedAudiences.split(",");
+ audList = new ArrayList<String>();
+ for (String a : audArray) {
+ audList.add(a);
+ }
+ }
+ return audList;
+ }
+</code></pre>
+<p>The above method parses the comma separated list of expected audiences and
makes it available for interrogation during token validation.</p>
+<pre><code> public void destroy() {
+ }
+
+ public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
+ throws IOException, ServletException {
+ String wireToken = null;
+ HttpServletRequest req = (HttpServletRequest) request;
+
+ String loginURL = constructLoginURL(req);
+ wireToken = getJWTFromCookie(req);
+ if (wireToken == null) {
+ if (req.getMethod().equals("OPTIONS")) {
+ // CORS preflight requests to determine allowed origins and related
config
+ // must be able to continue without being redirected
+ Subject sub = new Subject();
+ sub.getPrincipals().add(new PrimaryPrincipal("anonymous"));
+ continueWithEstablishedSecurityContext(sub, req,
(HttpServletResponse) response, chain);
+ }
+ log.sendRedirectToLoginURL(loginURL);
+ ((HttpServletResponse) response).sendRedirect(loginURL);
+ }
+ else {
+ JWTToken token = new JWTToken(wireToken);
+ boolean verified = false;
+ try {
+ verified = authority.verifyToken(token);
+ if (verified) {
+ Date expires = token.getExpiresDate();
+ if (expires == null || new Date().before(expires)) {
+ boolean audValid = validateAudiences(token);
+ if (audValid) {
+ Subject subject = createSubjectFromToken(token);
+ continueWithEstablishedSecurityContext(subject,
(HttpServletRequest)request, (HttpServletResponse)response, chain);
+ }
+ else {
+ log.failedToValidateAudience();
+ ((HttpServletResponse) response).sendRedirect(loginURL);
+ }
+ }
+ else {
+ log.tokenHasExpired();
+ ((HttpServletResponse) response).sendRedirect(loginURL);
+ }
+ }
+ else {
+ log.failedToVerifyTokenSignature();
+ ((HttpServletResponse) response).sendRedirect(loginURL);
+ }
+ } catch (TokenServiceException e) {
+ log.unableToVerifyToken(e);
+ ((HttpServletResponse) response).sendRedirect(loginURL);
+ }
+ }
+ }
+</code></pre>
+<p>The doFilter method above is where all the real work is done. We look for a
cookie by the configured name. If it isnât there then we redirect to the
configured SSO provider URL in order to acquire one. That is unless it is an
OPTIONS request which may be a preflight CORS request. You shouldnât need to
worry about this aspect. It is really a REST API concern not a web app UI
one.</p>
+<p>Once we get a cookie, the underlying JWT token is extracted and returned as
the wireToken from which we create a Knox specific JWTToken. This abstraction
is around the use of the nimbus JWT library which you can use directly. We will
cover those details separately.</p>
+<p>We then ask the token authority component to verify the token. This
involves signature validation of the signed token. In order to verify the
signature of the token you will need to have the public key of the Knox SSO
server configured and provided to the nimbus library through its API at
verification time. NOTE: This is a good place to look at the Hadoop
implementation as an example.</p>
+<p>Once we know the token is signed by a trusted party we then validate
whether it is expired and that it has an expected (or no) audience claims.</p>
+<p>Finally, when we have a valid token, we create a Java Subject from it and
continue the request through the filterChain as the authenticated user.</p>
+<pre><code> /**
+ * Encapsulate the acquisition of the JWT token from HTTP cookies within
the
+ * request.
+ *
+ * @param req servlet request to get the JWT token from
+ * @return serialized JWT token
+ */
+ protected String getJWTFromCookie(HttpServletRequest req) {
+ String serializedJWT = null;
+ Cookie[] cookies = req.getCookies();
+ if (cookies != null) {
+ for (Cookie cookie : cookies) {
+ if (cookieName.equals(cookie.getName())) {
+ log.cookieHasBeenFound(cookieName);
+ serializedJWT = cookie.getValue();
+ break;
+ }
+ }
+ }
+ return serializedJWT;
+ }
+</code></pre>
+<p>The above method extracts the serialized token from the cookie and returns
it as the wireToken.</p>
+<pre><code> /**
+ * Create the URL to be used for authentication of the user in the
absence of
+ * a JWT token within the incoming request.
+ *
+ * @param request for getting the original request URL
+ * @return url to use as login url for redirect
+ */
+ protected String constructLoginURL(HttpServletRequest request) {
+ String delimiter = "?";
+ if (authenticationProviderUrl.contains("?")) {
+ delimiter = "&";
+ }
+ String loginURL = authenticationProviderUrl + delimiter
+ + ORIGINAL_URL_QUERY_PARAM
+ + request.getRequestURL().toString()+ getOriginalQueryString(request);
+ return loginURL;
+ }
+
+ private String getOriginalQueryString(HttpServletRequest request) {
+ String originalQueryString = request.getQueryString();
+ return (originalQueryString == null) ? "" : "?" +
originalQueryString;
+ }
+</code></pre>
+<p>The above method creates the full URL to be used in redirecting to the
KnoxSSO endpoint. It includes the SSO provider URL as well as the original
request URL so that we can redirect back to it after authentication and token
exchange.</p>
+<pre><code> /**
+ * Validate whether any of the accepted audience claims is present in the
+ * issued token claims list for audience. Override this method in
subclasses
+ * in order to customize the audience validation behavior.
+ *
+ * @param jwtToken
+ * the JWT token where the allowed audiences will be found
+ * @return true if an expected audience is present, otherwise false
+ */
+ protected boolean validateAudiences(JWTToken jwtToken) {
+ boolean valid = false;
+ String[] tokenAudienceList = jwtToken.getAudienceClaims();
+ // if there were no expected audiences configured then just
+ // consider any audience acceptable
+ if (audiences == null) {
+ valid = true;
+ } else {
+ // if any of the configured audiences is found then consider it
+ // acceptable
+ for (String aud : tokenAudienceList) {
+ if (audiences.contains(aud)) {
+ //log.debug("JWT token audience has been
successfully validated");
+ log.jwtAudienceValidated();
+ valid = true;
+ break;
+ }
+ }
+ }
+ return valid;
+ }
+</code></pre>
+<p>The above method implements the audience claim semantics explained
earlier.</p>
+<pre><code> private void continueWithEstablishedSecurityContext(Subject
subject, final HttpServletRequest request, final
HttpServletResponse response, final FilterChain chain) throws IOException,
ServletException {
+ try {
+ Subject.doAs(
+ subject,
+ new PrivilegedExceptionAction<Object>() {
+ @Override
+ public Object run() throws Exception {
+ chain.doFilter(request, response);
+ return null;
+ }
+ }
+ );
+ }
+ catch (PrivilegedActionException e) {
+ Throwable t = e.getCause();
+ if (t instanceof IOException) {
+ throw (IOException) t;
+ }
+ else if (t instanceof ServletException) {
+ throw (ServletException) t;
+ }
+ else {
+ throw new ServletException(t);
+ }
+ }
+ }
+</code></pre>
+<p>This method continues the filter chain processing upon successful
validation of the token. This would need to be replaced with your
environmentâs equivalent of continuing the request or login to the app as the
authenticated user.</p>
+<pre><code> private Subject createSubjectFromToken(JWTToken token) {
+ final String principal = token.getSubject();
+ @SuppressWarnings("rawtypes")
+ HashSet emptySet = new HashSet();
+ Set<Principal> principals = new HashSet<Principal>();
+ Principal p = new PrimaryPrincipal(principal);
+ principals.add(p);
+ javax.security.auth.Subject subject = new
javax.security.auth.Subject(true, principals, emptySet, emptySet);
+ return subject;
+ }
+</code></pre>
+<p>This method takes a JWTToken and creates a Java Subject with the principals
expected by the rest of the Knox processing. This would need to be implemented
in a way appropriate for your operating environment as well. For instance, the
Hadoop handler implementation returns a Hadoop AuthenticationToken to the
calling filter which in turn ends up in the Hadoop auth cookie.</p>
+<pre><code> }
+</code></pre>
+<h4><a id="Token+Signature+Validation">Token Signature Validation</a> <a
href="#Token+Signature+Validation"><img
src="markbook-section-link.png"/></a></h4>
+<p>The following is the method from the Hadoop handler implementation that
validates the signature.</p>
+<pre><code> /**
+ * Verify the signature of the JWT token in this method. This method
depends on the * public key that was established during init based upon
the provisioned public key. * Override this method in subclasses in order to
customize the signature verification behavior.
+ * @param jwtToken the token that contains the signature to be validated
+ * @return valid true if signature verifies successfully; false otherwise
+ */
+ protected boolean validateSignature(SignedJWT jwtToken){
+ boolean valid=false;
+ if (JWSObject.State.SIGNED == jwtToken.getState()) {
+ LOG.debug("JWT token is in a SIGNED state");
+ if (jwtToken.getSignature() != null) {
+ LOG.debug("JWT token signature is not null");
+ try {
+ JWSVerifier verifier=new
RSASSAVerifier(publicKey);
+ if (jwtToken.verify(verifier)) {
+ valid=true;
+ LOG.debug("JWT token has been successfully
verified");
+ }
+ else {
+ LOG.warn("JWT signature verification
failed.");
+ }
+ }
+ catch (JOSEException je) {
+ LOG.warn("Error while validating signature",je);
+ }
+ }
+ }
+ return valid;
+ }
+</code></pre>
+<p>Hadoop Configuration Example The following is like the configuration in the
Hadoop handler implementation.</p>
+<p>OBSOLETE but in the proper spirit of HADOOP-11717 ( HADOOP-11717 - Add
Redirecting WebSSO behavior with JWT Token in Hadoop Auth RESOLVED )</p>
+<pre><code> <property>
+ <name>hadoop.http.authentication.type</name>
+
<value>org.apache.hadoop/security.authentication/server.JWTRedirectAuthenticationHandler</value>
+ </property>
+</code></pre>
+<p>This is the handler classname in Hadoop auth for JWT token (KnoxSSO)
support.</p>
+<pre><code> <property>
+
<name>hadoop.http.authentication.authentication.provider.url</name>
+
<value>http://c6401.ambari.apache.org:8888/knoxsso</value>
+ </property>
+</code></pre>
+<p>The above property is the SSO provider URL that points to the knoxsso
endpoint.</p>
+<pre><code> <property>
+
<name>hadoop.http.authentication.public.key.pem</name>
+
<value>MIICVjCCAb+gAwIBAgIJAPPvOtuTxFeiMA0GCSqGSIb3DQEBBQUAMG0xCzAJBgNV
+ BAYTAlVTMQ0wCwYDVQQIEwRUZXN0MQ0wCwYDVQQHEwRUZXN0MQ8wDQYDVQQKEwZI
+ YWRvb3AxDTALBgNVBAsTBFRlc3QxIDAeBgNVBAMTF2M2NDAxLmFtYmFyaS5hcGFj
+ aGUub3JnMB4XDTE1MDcxNjE4NDcyM1oXDTE2MDcxNTE4NDcyM1owbTELMAkGA1UE
+ BhMCVVMxDTALBgNVBAgTBFRlc3QxDTALBgNVBAcTBFRlc3QxDzANBgNVBAoTBkhh
+ ZG9vcDENMAsGA1UECxMEVGVzdDEgMB4GA1UEAxMXYzY0MDEuYW1iYXJpLmFwYWNo
+ ZS5vcmcwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAMFs/rymbiNvg8lDhsdA
+ qvh5uHP6iMtfv9IYpDleShjkS1C+IqId6bwGIEO8yhIS5BnfUR/fcnHi2ZNrXX7x
+ QUtQe7M9tDIKu48w//InnZ6VpAqjGShWxcSzR6UB/YoGe5ytHS6MrXaormfBg3VW
+ tDoy2MS83W8pweS6p5JnK7S5AgMBAAEwDQYJKoZIhvcNAQEFBQADgYEANyVg6EzE
+ 2q84gq7wQfLt9t047nYFkxcRfzhNVL3LB8p6IkM4RUrzWq4kLA+z+bpY2OdpkTOe
+ wUpEdVKzOQd4V7vRxpdANxtbG/XXrJAAcY/S+eMy1eDK73cmaVPnxPUGWmMnQXUi
+ TLab+w8tBQhNbq6BOQ42aOrLxA8k/M4cV1A=</value>
+ </property>
+</code></pre>
+<p>The above property holds the KnoxSSO serverâs public key for signature
verification. Adding it directly to the config like this is convenient and is
easily done through Ambari to existing config files that take custom
properties. Config is generally protected as root access only as well - so it
is a pretty good solution.</p>
+<h4><a id="Public+Key+Parsing">Public Key Parsing</a> <a
href="#Public+Key+Parsing"><img src="markbook-section-link.png"/></a></h4>
+<p>In order to turn the pem encoded config item into a public key the hadoop
handler implementation does the following in the init() method.</p>
+<pre><code> if (publicKey == null) {
+ String pemPublicKey = config.getProperty(PUBLIC_KEY_PEM);
+ if (pemPublicKey == null) {
+ throw new ServletException(
+ "Public key for signature validation must be
provisioned.");
+ }
+ publicKey = CertificateUtil.parseRSAPublicKey(pemPublicKey);
+ }
+</code></pre>
+<p>and the CertificateUtil class is below:</p>
+<pre><code> package org.apache.hadoop.security.authentication.util;
+
+ import java.io.ByteArrayInputStream;
+ import java.io.UnsupportedEncodingException;
+ import java.security.PublicKey;
+ import java.security.cert.CertificateException;
+ import java.security.cert.CertificateFactory;
+ import java.security.cert.X509Certificate;
+ import java.security.interfaces.RSAPublicKey;
+
+ import javax.servlet.ServletException;
+
+ public class CertificateUtil {
+ private static final String PEM_HEADER = "-----BEGIN
CERTIFICATE-----\n";
+ private static final String PEM_FOOTER = "\n-----END
CERTIFICATE-----";
+
+ /**
+ * Gets an RSAPublicKey from the provided PEM encoding.
+ *
+ * @param pem
+ * - the pem encoding from config without the header and footer
+ * @return RSAPublicKey the RSA public key
+ * @throws ServletException thrown if a processing error occurred
+ */
+ public static RSAPublicKey parseRSAPublicKey(String pem) throws
ServletException {
+ String fullPem = PEM_HEADER + pem + PEM_FOOTER;
+ PublicKey key = null;
+ try {
+ CertificateFactory fact =
CertificateFactory.getInstance("X.509");
+ ByteArrayInputStream is = new ByteArrayInputStream(
+ fullPem.getBytes("UTF8"));
+ X509Certificate cer = (X509Certificate)
fact.generateCertificate(is);
+ key = cer.getPublicKey();
+ } catch (CertificateException ce) {
+ String message = null;
+ if (pem.startsWith(PEM_HEADER)) {
+ message = "CertificateException - be sure
not to include PEM header "
+ + "and footer in the PEM configuration
element.";
+ } else {
+ message = "CertificateException - PEM may
be corrupt";
+ }
+ throw new ServletException(message, ce);
+ } catch (UnsupportedEncodingException uee) {
+ throw new ServletException(uee);
+ }
+ return (RSAPublicKey) key;
+ }
+ }
+</code></pre>
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