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/**
* ============LICENSE_START====================================================
* org.onap.aaf
* ===========================================================================
* Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
* ===========================================================================
* Licensed 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.
* ============LICENSE_END====================================================
*
*/
package org.onap.aaf.cadi.taf;
import java.net.URI;
import java.security.Principal;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.onap.aaf.cadi.Access;
import org.onap.aaf.cadi.Access.Level;
import org.onap.aaf.cadi.CachedPrincipal;
import org.onap.aaf.cadi.CachedPrincipal.Resp;
import org.onap.aaf.cadi.CadiException;
import org.onap.aaf.cadi.Locator;
import org.onap.aaf.cadi.Taf.LifeForm;
import org.onap.aaf.cadi.TrustChecker;
/**
* HttpEpiTaf
*
* An extension of the basic "EpiTAF" concept, check known HTTP Related TAFs for valid credentials
*
* @author Jonathan
*
*/
public class HttpEpiTaf implements HttpTaf {
private HttpTaf[] tafs;
private Access access;
private Locator<URI> locator;
private TrustChecker trustChecker;
/**
* HttpEpiTaf constructor
*
* Construct the HttpEpiTaf from variable Http specific TAF parameters
* @param tafs
* @throws CadiException
*/
public HttpEpiTaf(Access access, Locator<URI> locator, TrustChecker tc, HttpTaf ... tafs) throws CadiException{
this.tafs = tafs;
this.access = access;
this.locator = locator;
this.trustChecker = tc;
// Establish what Header Property to look for UserChain/Trust Props
if (tafs.length == 0) {
throw new CadiException("Need at least one HttpTaf implementation in constructor");
}
}
/**
* validate
*
* Respond with the first Http specific TAF to authenticate user based on variable info
* and "LifeForm" (is it a human behind a browser, or a server utilizing HTTP Protocol).
*
* If there is no HttpTAF that can authenticate, respond with the first TAF that suggests it can
* establish an Authentication conversation (TRY_AUTHENTICATING) (Examples include a redirect to CSP
* Servers for CSP Cookie, or BasicAuth 401 response, suggesting User/Password for given Realm
* submission
*
* If no TAF declares either, respond with NullTafResp (which denies all questions)
*/
public TafResp validate(LifeForm reading, HttpServletRequest req, HttpServletResponse resp) {
// Given a LifeForm Neutral, for HTTP, we need to discover true Life-Form Readings
if (reading == LifeForm.LFN) {
reading = tricorderScan(req);
}
TafResp tresp = null;
TafResp firstTry = null;
List<Redirectable> redirectables = null;
List<TafResp> log;
if(access.willLog(Level.DEBUG)) {
log = new ArrayList<>();
} else {
log = null;
}
try {
for (HttpTaf taf : tafs) {
final long start = System.nanoTime();
tresp = taf.validate(reading, req, resp);
addToLog(log, tresp, start);
switch(tresp.isAuthenticated()) {
case TRY_ANOTHER_TAF:
break; // and loop
case TRY_AUTHENTICATING:
if (tresp instanceof Redirectable) {
if (redirectables == null) {
redirectables = new ArrayList<>();
}
redirectables.add((Redirectable)tresp);
} else if (firstTry == null) {
firstTry = tresp;
}
break;
case IS_AUTHENTICATED:
tresp = trustChecker.mayTrust(tresp, req);
return tresp;
default:
return tresp;
}
}
} finally {
printLog(log);
}
// If No TAFs configured, at this point. It is safer at this point to be "not validated",
// rather than "let it go"
// Note: if exists, there will always be more than 0 entries, according to above code
if (redirectables == null) {
return (firstTry != null) ? firstTry : NullTafResp.singleton();
}
// If there is one Tryable entry then return it
if (redirectables.size() > 1) {
return LoginPageTafResp.create(access, locator, resp, redirectables);
} else {
return redirectables.get(0);
}
}
public boolean revalidate(Principal prin) throws Exception {
return false;
}
/*
* Since this is internal, we use a little Star Trek humor to indicate looking in the HTTP Request to see if we can determine what kind
* of "LifeForm" reading we can determine, i.e. is there a Human (CarbonBasedLifeForm) behind a browser, or is it mechanical
* id (SiliconBasedLifeForm)? This makes a difference in some Authentication, i.e CSP, which doesn't work well for SBLFs
*/
private LifeForm tricorderScan(HttpServletRequest req) {
// For simplicity's sake, we'll say Humans use FQDNs, not IPs.
// Current guess that only Browsers bother to set "Agent" codes that identify the kind of browser they are.
// If mechanical frameworks are found that populate this, then more advanced analysis may be required
// Jonathan 1/22/2013
String agent = req.getHeader("User-Agent");
if (agent != null && agent.startsWith("Mozilla")) { // covers I.E./Firefox/Safari/probably any other "advanced" Browser see http://en.wikipedia.org/wiki/User_agent
return LifeForm.CBLF;
}
return LifeForm.SBLF; // notably skips "curl","wget", (which is desired behavior. We don't want to try CSP, etc on these)
}
public Resp revalidate(CachedPrincipal prin, Object state) {
Resp resp;
for (HttpTaf taf : tafs) {
resp = taf.revalidate(prin, state);
if (resp != Resp.NOT_MINE) {
return resp;
}
// switch(resp) {
// case NOT_MINE:
// break;
// default:
// return resp;
// }
}
return Resp.NOT_MINE;
}
private void addToLog(List<TafResp> log, final TafResp tresp, final long start) {
if (log == null) {
return;
}
tresp.timing(start);
log.add(tresp);
}
private void printLog(List<TafResp> log) {
if (log == null) {
return;
}
for (TafResp tresp : log) {
access.printf(Level.DEBUG, "%s: %s, ms=%f", tresp.taf(), tresp.desc(), tresp.timing());
}
}
/**
* List HttpTafs with their "toString" representations... primarily useful for Debugging in an IDE
* like Eclipse.
*/
public String toString() {
StringBuilder sb = new StringBuilder();
for (HttpTaf ht : tafs) {
sb.append(ht.toString());
sb.append(". ");
}
return sb.toString();
}
}
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