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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  *
     25  */
     26 
     27 #include "config.h"
     28 #include "CrossOriginAccessControl.h"
     29 
     30 #include "HTTPParsers.h"
     31 #include "ResourceResponse.h"
     32 #include "SecurityOrigin.h"
     33 #include <wtf/HashSet.h>
     34 #include <wtf/Threading.h>
     35 #include <wtf/text/AtomicString.h>
     36 
     37 namespace WebCore {
     38 
     39 bool isOnAccessControlSimpleRequestMethodWhitelist(const String& method)
     40 {
     41     return method == "GET" || method == "HEAD" || method == "POST";
     42 }
     43 
     44 bool isOnAccessControlSimpleRequestHeaderWhitelist(const String& name, const String& value)
     45 {
     46     if (equalIgnoringCase(name, "accept") || equalIgnoringCase(name, "accept-language") || equalIgnoringCase(name, "content-language"))
     47         return true;
     48 
     49     // Preflight is required for MIME types that can not be sent via form submission.
     50     if (equalIgnoringCase(name, "content-type")) {
     51         String mimeType = extractMIMETypeFromMediaType(value);
     52         return equalIgnoringCase(mimeType, "application/x-www-form-urlencoded")
     53             || equalIgnoringCase(mimeType, "multipart/form-data")
     54             || equalIgnoringCase(mimeType, "text/plain");
     55     }
     56 
     57     return false;
     58 }
     59 
     60 bool isSimpleCrossOriginAccessRequest(const String& method, const HTTPHeaderMap& headerMap)
     61 {
     62     if (!isOnAccessControlSimpleRequestMethodWhitelist(method))
     63         return false;
     64 
     65     HTTPHeaderMap::const_iterator end = headerMap.end();
     66     for (HTTPHeaderMap::const_iterator it = headerMap.begin(); it != end; ++it) {
     67         if (!isOnAccessControlSimpleRequestHeaderWhitelist(it->first, it->second))
     68             return false;
     69     }
     70 
     71     return true;
     72 }
     73 
     74 typedef HashSet<String, CaseFoldingHash> HTTPHeaderSet;
     75 static PassOwnPtr<HTTPHeaderSet> createAllowedCrossOriginResponseHeadersSet()
     76 {
     77     OwnPtr<HTTPHeaderSet> headerSet = adoptPtr(new HashSet<String, CaseFoldingHash>);
     78 
     79     headerSet->add("cache-control");
     80     headerSet->add("content-language");
     81     headerSet->add("content-type");
     82     headerSet->add("expires");
     83     headerSet->add("last-modified");
     84     headerSet->add("pragma");
     85 
     86     return headerSet.release();
     87 }
     88 
     89 bool isOnAccessControlResponseHeaderWhitelist(const String& name)
     90 {
     91     AtomicallyInitializedStatic(HTTPHeaderSet*, allowedCrossOriginResponseHeaders = createAllowedCrossOriginResponseHeadersSet().leakPtr());
     92 
     93     return allowedCrossOriginResponseHeaders->contains(name);
     94 }
     95 
     96 bool passesAccessControlCheck(const ResourceResponse& response, bool includeCredentials, SecurityOrigin* securityOrigin, String& errorDescription)
     97 {
     98     // A wildcard Access-Control-Allow-Origin can not be used if credentials are to be sent,
     99     // even with Access-Control-Allow-Credentials set to true.
    100     const String& accessControlOriginString = response.httpHeaderField("Access-Control-Allow-Origin");
    101     if (accessControlOriginString == "*" && !includeCredentials)
    102         return true;
    103 
    104     if (securityOrigin->isUnique()) {
    105         errorDescription = "Cannot make any requests from " + securityOrigin->toString() + ".";
    106         return false;
    107     }
    108 
    109     // FIXME: Access-Control-Allow-Origin can contain a list of origins.
    110     RefPtr<SecurityOrigin> accessControlOrigin = SecurityOrigin::createFromString(accessControlOriginString);
    111     if (!accessControlOrigin->isSameSchemeHostPort(securityOrigin)) {
    112         errorDescription = (accessControlOriginString == "*") ? "Cannot use wildcard in Access-Control-Allow-Origin when credentials flag is true."
    113             : "Origin " + securityOrigin->toString() + " is not allowed by Access-Control-Allow-Origin.";
    114         return false;
    115     }
    116 
    117     if (includeCredentials) {
    118         const String& accessControlCredentialsString = response.httpHeaderField("Access-Control-Allow-Credentials");
    119         if (accessControlCredentialsString != "true") {
    120             errorDescription = "Credentials flag is true, but Access-Control-Allow-Credentials is not \"true\".";
    121             return false;
    122         }
    123     }
    124 
    125     return true;
    126 }
    127 
    128 } // namespace WebCore
    129