J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.security.util; |
| 27 | |
| 28 | import java.security.*; |
| 29 | import java.util.HashMap; |
| 30 | import java.io.ByteArrayOutputStream; |
| 31 | |
| 32 | /** |
| 33 | * This class is used to compute digests on sections of the Manifest. |
| 34 | */ |
| 35 | public class ManifestDigester { |
| 36 | |
| 37 | public static final String MF_MAIN_ATTRS = "Manifest-Main-Attributes"; |
| 38 | |
| 39 | /** the raw bytes of the manifest */ |
| 40 | private byte rawBytes[]; |
| 41 | |
| 42 | /** the offset/length pair for a section */ |
| 43 | private HashMap<String, Entry> entries; // key is a UTF-8 string |
| 44 | |
| 45 | /** state returned by findSection */ |
| 46 | static class Position { |
| 47 | int endOfFirstLine; // not including newline character |
| 48 | |
| 49 | int endOfSection; // end of section, not including the blank line |
| 50 | // between sections |
| 51 | int startOfNext; // the start of the next section |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * find a section in the manifest. |
| 56 | * |
| 57 | * @param offset should point to the starting offset with in the |
| 58 | * raw bytes of the next section. |
| 59 | * |
| 60 | * @pos set by |
| 61 | * |
| 62 | * @returns false if end of bytes has been reached, otherwise returns |
| 63 | * true |
| 64 | */ |
| 65 | private boolean findSection(int offset, Position pos) |
| 66 | { |
| 67 | int i = offset, len = rawBytes.length; |
| 68 | int last = offset; |
| 69 | int next; |
| 70 | boolean allBlank = true; |
| 71 | |
| 72 | pos.endOfFirstLine = -1; |
| 73 | |
| 74 | while (i < len) { |
| 75 | byte b = rawBytes[i]; |
| 76 | switch(b) { |
| 77 | case '\r': |
| 78 | if (pos.endOfFirstLine == -1) |
| 79 | pos.endOfFirstLine = i-1; |
| 80 | if ((i < len) && (rawBytes[i+1] == '\n')) |
| 81 | i++; |
| 82 | case '\n': |
| 83 | if (pos.endOfFirstLine == -1) |
| 84 | pos.endOfFirstLine = i-1; |
| 85 | if (allBlank || (i == len-1)) { |
| 86 | if (i == len-1) |
| 87 | pos.endOfSection = i; |
| 88 | else |
| 89 | pos.endOfSection = last; |
| 90 | pos.startOfNext = i+1; |
| 91 | return true; |
| 92 | } |
| 93 | else { |
| 94 | // start of a new line |
| 95 | last = i; |
| 96 | allBlank = true; |
| 97 | } |
| 98 | break; |
| 99 | default: |
| 100 | allBlank = false; |
| 101 | break; |
| 102 | } |
| 103 | i++; |
| 104 | } |
| 105 | return false; |
| 106 | } |
| 107 | |
| 108 | public ManifestDigester(byte bytes[]) |
| 109 | { |
| 110 | rawBytes = bytes; |
| 111 | entries = new HashMap<String, Entry>(); |
| 112 | |
| 113 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| 114 | |
| 115 | Position pos = new Position(); |
| 116 | |
| 117 | if (!findSection(0, pos)) |
| 118 | return; // XXX: exception? |
| 119 | |
| 120 | // create an entry for main attributes |
| 121 | entries.put(MF_MAIN_ATTRS, |
| 122 | new Entry(0, pos.endOfSection + 1, pos.startOfNext, rawBytes)); |
| 123 | |
| 124 | int start = pos.startOfNext; |
| 125 | while(findSection(start, pos)) { |
| 126 | int len = pos.endOfFirstLine-start+1; |
| 127 | int sectionLen = pos.endOfSection-start+1; |
| 128 | int sectionLenWithBlank = pos.startOfNext-start; |
| 129 | |
| 130 | if (len > 6) { |
| 131 | if (isNameAttr(bytes, start)) { |
| 132 | StringBuilder nameBuf = new StringBuilder(); |
| 133 | |
| 134 | try { |
| 135 | nameBuf.append( |
| 136 | new String(bytes, start+6, len-6, "UTF8")); |
| 137 | |
| 138 | int i = start + len; |
| 139 | if ((i-start) < sectionLen) { |
| 140 | if (bytes[i] == '\r') { |
| 141 | i += 2; |
| 142 | } else { |
| 143 | i += 1; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | while ((i-start) < sectionLen) { |
| 148 | if (bytes[i++] == ' ') { |
| 149 | // name is wrapped |
| 150 | int wrapStart = i; |
| 151 | while (((i-start) < sectionLen) |
| 152 | && (bytes[i++] != '\n')); |
| 153 | if (bytes[i-1] != '\n') |
| 154 | return; // XXX: exception? |
| 155 | int wrapLen; |
| 156 | if (bytes[i-2] == '\r') |
| 157 | wrapLen = i-wrapStart-2; |
| 158 | else |
| 159 | wrapLen = i-wrapStart-1; |
| 160 | |
| 161 | nameBuf.append(new String(bytes, wrapStart, |
| 162 | wrapLen, "UTF8")); |
| 163 | } else { |
| 164 | break; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | entries.put(nameBuf.toString(), |
| 169 | new Entry(start, sectionLen, sectionLenWithBlank, |
| 170 | rawBytes)); |
| 171 | |
| 172 | } catch (java.io.UnsupportedEncodingException uee) { |
| 173 | throw new IllegalStateException( |
| 174 | "UTF8 not available on platform"); |
| 175 | } |
| 176 | } |
| 177 | } |
| 178 | start = pos.startOfNext; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | private boolean isNameAttr(byte bytes[], int start) |
| 183 | { |
| 184 | return ((bytes[start] == 'N') || (bytes[start] == 'n')) && |
| 185 | ((bytes[start+1] == 'a') || (bytes[start+1] == 'A')) && |
| 186 | ((bytes[start+2] == 'm') || (bytes[start+2] == 'M')) && |
| 187 | ((bytes[start+3] == 'e') || (bytes[start+3] == 'E')) && |
| 188 | (bytes[start+4] == ':') && |
| 189 | (bytes[start+5] == ' '); |
| 190 | } |
| 191 | |
| 192 | public static class Entry { |
| 193 | int offset; |
| 194 | int length; |
| 195 | int lengthWithBlankLine; |
| 196 | byte[] rawBytes; |
| 197 | boolean oldStyle; |
| 198 | |
| 199 | public Entry(int offset, int length, |
| 200 | int lengthWithBlankLine, byte[] rawBytes) |
| 201 | { |
| 202 | this.offset = offset; |
| 203 | this.length = length; |
| 204 | this.lengthWithBlankLine = lengthWithBlankLine; |
| 205 | this.rawBytes = rawBytes; |
| 206 | } |
| 207 | |
| 208 | public byte[] digest(MessageDigest md) |
| 209 | { |
| 210 | md.reset(); |
| 211 | if (oldStyle) { |
| 212 | doOldStyle(md,rawBytes, offset, lengthWithBlankLine); |
| 213 | } else { |
| 214 | md.update(rawBytes, offset, lengthWithBlankLine); |
| 215 | } |
| 216 | return md.digest(); |
| 217 | } |
| 218 | |
| 219 | private void doOldStyle(MessageDigest md, |
| 220 | byte[] bytes, |
| 221 | int offset, |
| 222 | int length) |
| 223 | { |
| 224 | // this is too gross to even document, but here goes |
| 225 | // the 1.1 jar verification code ignored spaces at the |
| 226 | // end of lines when calculating digests, so that is |
| 227 | // what this code does. It only gets called if we |
| 228 | // are parsing a 1.1 signed signature file |
| 229 | int i = offset; |
| 230 | int start = offset; |
| 231 | int max = offset + length; |
| 232 | int prev = -1; |
| 233 | while(i <max) { |
| 234 | if ((bytes[i] == '\r') && (prev == ' ')) { |
| 235 | md.update(bytes, start, i-start-1); |
| 236 | start = i; |
| 237 | } |
| 238 | prev = bytes[i]; |
| 239 | i++; |
| 240 | } |
| 241 | md.update(bytes, start, i-start); |
| 242 | } |
| 243 | |
| 244 | |
| 245 | /** Netscape doesn't include the new line. Intel and JavaSoft do */ |
| 246 | |
| 247 | public byte[] digestWorkaround(MessageDigest md) |
| 248 | { |
| 249 | md.reset(); |
| 250 | md.update(rawBytes, offset, length); |
| 251 | return md.digest(); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | public Entry get(String name, boolean oldStyle) { |
| 256 | Entry e = entries.get(name); |
| 257 | if (e != null) |
| 258 | e.oldStyle = oldStyle; |
| 259 | return e; |
| 260 | } |
| 261 | |
| 262 | public byte[] manifestDigest(MessageDigest md) |
| 263 | { |
| 264 | md.reset(); |
| 265 | md.update(rawBytes, 0, rawBytes.length); |
| 266 | return md.digest(); |
| 267 | } |
| 268 | |
| 269 | } |