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| 1 | +/* |
| 2 | + * This file is part of Arduino. |
| 3 | + * |
| 4 | + * Arduino is free software; you can redistribute it and/or modify |
| 5 | + * it under the terms of the GNU General Public License as published by |
| 6 | + * the Free Software Foundation; either version 2 of the License, or |
| 7 | + * (at your option) any later version. |
| 8 | + * |
| 9 | + * This program is distributed in the hope that it will be useful, |
| 10 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | + * GNU General Public License for more details. |
| 13 | + * |
| 14 | + * You should have received a copy of the GNU General Public License |
| 15 | + * along with this program; if not, write to the Free Software |
| 16 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | + * |
| 18 | + * As a special exception, you may use this file as part of a free software |
| 19 | + * library without restriction. Specifically, if other files instantiate |
| 20 | + * templates or use macros or inline functions from this file, or you compile |
| 21 | + * this file and link it with other files to produce an executable, this |
| 22 | + * file does not by itself cause the resulting executable to be covered by |
| 23 | + * the GNU General Public License. This exception does not however |
| 24 | + * invalidate any other reasons why the executable file might be covered by |
| 25 | + * the GNU General Public License. |
| 26 | + * |
| 27 | + * Copyright 2013 Arduino LLC (http://www.arduino.cc/) |
| 28 | + */ |
| 29 | + |
| 30 | +package cc.arduino.packages.security; |
| 31 | + |
| 32 | +import java.io.BufferedReader; |
| 33 | +import java.io.ByteArrayInputStream; |
| 34 | +import java.io.ByteArrayOutputStream; |
| 35 | +import java.io.File; |
| 36 | +import java.io.FileInputStream; |
| 37 | +import java.io.FileNotFoundException; |
| 38 | +import java.io.IOException; |
| 39 | +import java.io.InputStreamReader; |
| 40 | +import java.security.Security; |
| 41 | + |
| 42 | +import org.bouncycastle.bcpg.ArmoredInputStream; |
| 43 | +import org.bouncycastle.jce.provider.BouncyCastleProvider; |
| 44 | +import org.bouncycastle.openpgp.PGPObjectFactory; |
| 45 | +import org.bouncycastle.openpgp.PGPPublicKey; |
| 46 | +import org.bouncycastle.openpgp.PGPPublicKeyRingCollection; |
| 47 | +import org.bouncycastle.openpgp.PGPSignature; |
| 48 | +import org.bouncycastle.openpgp.PGPSignatureList; |
| 49 | +import org.bouncycastle.openpgp.operator.jcajce.JcaPGPContentVerifierBuilderProvider; |
| 50 | + |
| 51 | +import processing.app.helpers.StringUtils; |
| 52 | +import cc.arduino.packages.security.keys.PackagersPublicKeys; |
| 53 | + |
| 54 | +public class ClearSignedVerifier { |
| 55 | + |
| 56 | + public static class VerifyResult { |
| 57 | + public byte clearText[]; |
| 58 | + public boolean verified; |
| 59 | + public Exception error; |
| 60 | + } |
| 61 | + |
| 62 | + /** |
| 63 | + * Verify a PGP clearText-signature. |
| 64 | + * |
| 65 | + * @param signedTextFile |
| 66 | + * A File containing the clearText signature |
| 67 | + * @param pubKeyRing |
| 68 | + * A public key-ring containing the public key needed for the |
| 69 | + * signature verification |
| 70 | + * @return A VerifyResult class with the clearText and the signature |
| 71 | + * verification status |
| 72 | + * @throws FileNotFoundException |
| 73 | + */ |
| 74 | + public static VerifyResult verify(File signedTextFile, |
| 75 | + PGPPublicKeyRingCollection pubKeyRing) |
| 76 | + throws FileNotFoundException { |
| 77 | + // Create the result object |
| 78 | + VerifyResult result = new VerifyResult(); |
| 79 | + result.clearText = null; |
| 80 | + result.verified = false; |
| 81 | + result.error = null; |
| 82 | + |
| 83 | + ArmoredInputStream in = null; |
| 84 | + try { |
| 85 | + // Extract clear text. |
| 86 | + // Dash-encoding is removed by ArmoredInputStream. |
| 87 | + in = new ArmoredInputStream(new FileInputStream(signedTextFile)); |
| 88 | + ByteArrayOutputStream temp = new ByteArrayOutputStream(in.available()); |
| 89 | + while (true) { |
| 90 | + int c = in.read(); |
| 91 | + if (c == -1) |
| 92 | + throw new IOException("Unexpected end of file"); |
| 93 | + if (!in.isClearText()) |
| 94 | + break; |
| 95 | + temp.write(c); |
| 96 | + } |
| 97 | + byte clearText[] = temp.toByteArray(); |
| 98 | + result.clearText = clearText; |
| 99 | + |
| 100 | + // Extract signature from clear-signed text |
| 101 | + PGPObjectFactory pgpFact = new PGPObjectFactory(in); |
| 102 | + PGPSignatureList p3 = (PGPSignatureList) pgpFact.nextObject(); |
| 103 | + PGPSignature sig = p3.get(0); |
| 104 | + |
| 105 | + // Decode public key |
| 106 | + PGPPublicKey publicKey = pubKeyRing.getPublicKey(sig.getKeyID()); |
| 107 | + |
| 108 | + // Verify signature |
| 109 | + Security.addProvider(new BouncyCastleProvider()); |
| 110 | + sig.init(new JcaPGPContentVerifierBuilderProvider().setProvider("BC"), |
| 111 | + publicKey); |
| 112 | + // RFC 4880, section 7: http://tools.ietf.org/html/rfc4880#section-7 |
| 113 | + // The signature must be validated using clear text: |
| 114 | + // - without trailing white spaces on every line |
| 115 | + // - using CR LF line endings, no matter what the original line ending is |
| 116 | + // - without the latest line ending |
| 117 | + BufferedReader textIn = new BufferedReader(new InputStreamReader( |
| 118 | + new ByteArrayInputStream(clearText))); |
| 119 | + while (true) { |
| 120 | + // remove trailing whitespace and line endings |
| 121 | + String line = StringUtils.rtrim(textIn.readLine()); |
| 122 | + sig.update(line.getBytes()); |
| 123 | + if (!textIn.ready()) // skip latest line ending |
| 124 | + break; |
| 125 | + // always use CR LF |
| 126 | + sig.update((byte) '\r'); |
| 127 | + sig.update((byte) '\n'); |
| 128 | + } |
| 129 | + |
| 130 | + // Prepare the result |
| 131 | + result.verified = sig.verify(); |
| 132 | + } catch (Exception e) { |
| 133 | + result.error = e; |
| 134 | + } finally { |
| 135 | + if (in != null) |
| 136 | + try { |
| 137 | + in.close(); |
| 138 | + } catch (IOException e) { |
| 139 | + e.printStackTrace(); |
| 140 | + } |
| 141 | + } |
| 142 | + return result; |
| 143 | + } |
| 144 | + |
| 145 | + public static void main(String[] args) throws Exception { |
| 146 | + VerifyResult verify = verify(new File( |
| 147 | + "/home/megabug/git/arduino/test.txt.asc"), new PackagersPublicKeys()); |
| 148 | + System.out.println(verify.verified); |
| 149 | + } |
| 150 | +} |
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