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0405a427f1
We're only using it for generating multiparty boundaries, and there's no real need for the random boundary values to be cryptographically secure. The point of the randomness is just to make collisions with content in the payload sufficiently unlikely. The app itself controls the payload contents, and while it might be derived from user-submitted content, in practice it would be nearly infeasible to get the payload to contain arbitrary boundary values even if the RNG-produced boundaries could be determined in advance. To further insulate against this, I've increased the boundary size (from 40 bits to 192) and added an actual check that the boundary isn't present in the input data, so that in the extremely unlikely event of a collision, we fail rather than producing an invalid multipart request. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=142784289
106 lines
4.4 KiB
Java
106 lines
4.4 KiB
Java
// Copyright 2016 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import static com.google.common.base.Preconditions.checkState;
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import static com.google.common.io.BaseEncoding.base64;
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import static com.google.common.net.HttpHeaders.AUTHORIZATION;
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import static com.google.common.net.HttpHeaders.CONTENT_DISPOSITION;
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import static com.google.common.net.HttpHeaders.CONTENT_LENGTH;
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import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
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import static java.lang.String.format;
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import static java.nio.charset.StandardCharsets.UTF_8;
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import com.google.appengine.api.urlfetch.HTTPHeader;
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import com.google.appengine.api.urlfetch.HTTPRequest;
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import com.google.appengine.api.urlfetch.HTTPResponse;
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import com.google.common.base.Ascii;
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import com.google.common.base.Optional;
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import com.google.common.base.Strings;
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import com.google.common.net.MediaType;
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import java.util.Random;
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/** Helper methods for the App Engine URL fetch service. */
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public final class UrlFetchUtils {
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@NonFinalForTesting
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private static Random random = new Random();
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/** Returns value of first header matching {@code name}. */
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public static Optional<String> getHeaderFirst(HTTPResponse rsp, String name) {
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return getHeaderFirstInternal(rsp.getHeadersUncombined(), name);
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}
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/** Returns value of first header matching {@code name}. */
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public static Optional<String> getHeaderFirst(HTTPRequest req, String name) {
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return getHeaderFirstInternal(req.getHeaders(), name);
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}
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private static Optional<String> getHeaderFirstInternal(Iterable<HTTPHeader> hdrs, String name) {
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name = Ascii.toLowerCase(name);
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for (HTTPHeader header : hdrs) {
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if (Ascii.toLowerCase(header.getName()).equals(name)) {
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return Optional.of(header.getValue());
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}
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}
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return Optional.absent();
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}
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/**
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* Sets payload on request as a {@code multipart/form-data} request.
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*
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* <p>This is equivalent to running the command: {@code curl -F fieldName=@payload.txt URL}
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*
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* @see <a href="http://www.ietf.org/rfc/rfc2388.txt"> RFC2388 - Returning Values from Forms</a>
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*/
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public static void setPayloadMultipart(
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HTTPRequest request, String name, String filename, MediaType contentType, String data) {
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String boundary = createMultipartBoundary();
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checkState(
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!data.contains(boundary),
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"Multipart data contains autogenerated boundary: %s", boundary);
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StringBuilder multipart = new StringBuilder();
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multipart.append(format("--%s\r\n", boundary));
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multipart.append(format("%s: form-data; name=\"%s\"; filename=\"%s\"\r\n",
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CONTENT_DISPOSITION, name, filename));
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multipart.append(format("%s: %s\r\n", CONTENT_TYPE, contentType.toString()));
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multipart.append("\r\n");
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multipart.append(data);
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multipart.append("\r\n");
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multipart.append(format("--%s--", boundary));
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byte[] payload = multipart.toString().getBytes(UTF_8);
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request.addHeader(
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new HTTPHeader(CONTENT_TYPE, format("multipart/form-data; boundary=\"%s\"", boundary)));
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request.addHeader(new HTTPHeader(CONTENT_LENGTH, Integer.toString(payload.length)));
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request.setPayload(payload);
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}
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private static String createMultipartBoundary() {
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// Generate 192 random bits (24 bytes) to produce 192/log_2(64) = 192/6 = 32 base64 digits.
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byte[] rand = new byte[24];
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random.nextBytes(rand);
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// Boundary strings can be up to 70 characters long, so use 30 hyphens plus 32 random digits.
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// See https://tools.ietf.org/html/rfc2046#section-5.1.1
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return Strings.repeat("-", 30) + base64().encode(rand);
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}
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/** Sets the HTTP Basic Authentication header on an {@link HTTPRequest}. */
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public static void setAuthorizationHeader(HTTPRequest req, Optional<String> login) {
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if (login.isPresent()) {
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String token = base64().encode(login.get().getBytes(UTF_8));
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req.addHeader(new HTTPHeader(AUTHORIZATION, "Basic " + token));
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}
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}
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}
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