| 1 | /**************************************************************** |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
| 3 | * or more contributor license agreements. See the NOTICE file * |
| 4 | * distributed with this work for additional information * |
| 5 | * regarding copyright ownership. The ASF licenses this file * |
| 6 | * to you under the Apache License, Version 2.0 (the * |
| 7 | * "License"); you may not use this file except in compliance * |
| 8 | * with the License. You may obtain a copy of the License at * |
| 9 | * * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
| 11 | * * |
| 12 | * Unless required by applicable law or agreed to in writing, * |
| 13 | * software distributed under the License is distributed on an * |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
| 15 | * KIND, either express or implied. See the License for the * |
| 16 | * specific language governing permissions and limitations * |
| 17 | * under the License. * |
| 18 | ****************************************************************/ |
| 19 | |
| 20 | package org.apache.james.jdkim; |
| 21 | |
| 22 | import java.io.IOException; |
| 23 | import java.io.InputStream; |
| 24 | import java.io.OutputStream; |
| 25 | import java.security.Signature; |
| 26 | import java.security.SignatureException; |
| 27 | import java.util.HashMap; |
| 28 | import java.util.Iterator; |
| 29 | import java.util.List; |
| 30 | import java.util.Map; |
| 31 | |
| 32 | import org.apache.james.jdkim.api.Headers; |
| 33 | import org.apache.james.jdkim.api.SignatureRecord; |
| 34 | import org.apache.james.jdkim.exceptions.PermFailException; |
| 35 | |
| 36 | public abstract class DKIMCommon { |
| 37 | |
| 38 | private static final boolean DEEP_DEBUG = false; |
| 39 | |
| 40 | protected static void updateSignature(Signature signature, boolean relaxed, |
| 41 | CharSequence header, String fv) throws SignatureException { |
| 42 | if (relaxed) { |
| 43 | if (DEEP_DEBUG) |
| 44 | System.out |
| 45 | .println("#" + header.toString().toLowerCase() + ":-"); |
| 46 | signature.update(header.toString().toLowerCase().getBytes()); |
| 47 | signature.update(":".getBytes()); |
| 48 | String headerValue = fv.substring(fv.indexOf(':') + 1); |
| 49 | headerValue = headerValue.replaceAll("\r\n[\t ]", " "); |
| 50 | headerValue = headerValue.replaceAll("[\t ]+", " "); |
| 51 | headerValue = headerValue.trim(); |
| 52 | signature.update(headerValue.getBytes()); |
| 53 | if (DEEP_DEBUG) |
| 54 | System.out.println("#" + headerValue + "#"); |
| 55 | } else { |
| 56 | signature.update(fv.getBytes()); |
| 57 | if (DEEP_DEBUG) |
| 58 | System.out.println("#" + fv + "#"); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | protected static void signatureCheck(Headers h, SignatureRecord sign, |
| 63 | List headers, Signature signature) |
| 64 | throws SignatureException, PermFailException { |
| 65 | |
| 66 | boolean relaxedHeaders = SignatureRecord.RELAXED.equals(sign |
| 67 | .getHeaderCanonicalisationMethod()); |
| 68 | if (!relaxedHeaders |
| 69 | && !SignatureRecord.SIMPLE.equals(sign |
| 70 | .getHeaderCanonicalisationMethod())) { |
| 71 | throw new PermFailException( |
| 72 | "Unsupported canonicalization algorythm: " |
| 73 | + sign.getHeaderCanonicalisationMethod()); |
| 74 | } |
| 75 | |
| 76 | // NOTE: this could be improved by using iterators. |
| 77 | // NOTE: this relies on the list returned by Message being in insertion |
| 78 | // order |
| 79 | Map/* String, Integer */processedHeader = new HashMap(); |
| 80 | |
| 81 | for (Iterator i = headers.iterator(); i.hasNext();) { |
| 82 | CharSequence header = (CharSequence) i.next(); |
| 83 | // NOTE check this getter is case insensitive |
| 84 | List hl = h.getFields(header.toString()); |
| 85 | if (hl != null && hl.size() > 0) { |
| 86 | Integer done = (Integer) processedHeader.get(header.toString()); |
| 87 | if (done == null) |
| 88 | done = new Integer(0); /* Integer.valueOf(0) */ |
| 89 | int doneHeaders = done.intValue() + 1; |
| 90 | if (doneHeaders <= hl.size()) { |
| 91 | String fv = (String) hl.get(hl.size() - doneHeaders); |
| 92 | updateSignature(signature, relaxedHeaders, header, fv); |
| 93 | signature.update("\r\n".getBytes()); |
| 94 | processedHeader.put(header.toString(), new Integer( |
| 95 | doneHeaders)); |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | String signatureStub = "DKIM-Signature:" + sign.toUnsignedString(); |
| 101 | updateSignature(signature, relaxedHeaders, "dkim-signature", |
| 102 | signatureStub); |
| 103 | } |
| 104 | |
| 105 | public static void streamCopy(InputStream bodyIs, OutputStream out) |
| 106 | throws IOException { |
| 107 | byte[] buffer = new byte[2048]; |
| 108 | int read; |
| 109 | while ((read = bodyIs.read(buffer)) > 0) { |
| 110 | out.write(buffer, 0, read); |
| 111 | } |
| 112 | bodyIs.close(); |
| 113 | out.close(); |
| 114 | } |
| 115 | |
| 116 | } |