Browse Source
Push certificates ("git push --signed") have been part of
git-core since version 2.2.0 (released Nov 26 2014). We also
want to support that feature.
This is not complete and is lacking the actual functionality
to validate the signature for now.
Change-Id: I249869cadb2d55aef016371b9311b8583591b9cf
Signed-off-by: Stefan Beller <sbeller@google.com>
stable-4.0
Stefan Beller
10 years ago
8 changed files with 620 additions and 0 deletions
@ -0,0 +1,147 @@
|
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/* |
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* Copyright (C) 2015, Google Inc. |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
||||
* under the terms of the Eclipse Distribution License v1.0 which |
||||
* accompanies this distribution, is reproduced below, and is |
||||
* available at http://www.eclipse.org/org/documents/edl-v10.php
|
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* |
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* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or |
||||
* without modification, are permitted provided that the following |
||||
* conditions are met: |
||||
* |
||||
* - Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* |
||||
* - Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following |
||||
* disclaimer in the documentation and/or other materials provided |
||||
* with the distribution. |
||||
* |
||||
* - Neither the name of the Eclipse Foundation, Inc. nor the |
||||
* names of its contributors may be used to endorse or promote |
||||
* products derived from this software without specific prior |
||||
* written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
||||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
||||
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.transport; |
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|
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import java.io.UnsupportedEncodingException; |
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import java.security.InvalidKeyException; |
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import java.security.NoSuchAlgorithmException; |
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|
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import javax.crypto.Mac; |
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import javax.crypto.spec.SecretKeySpec; |
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import org.eclipse.jgit.internal.storage.dfs.DfsRepository; |
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import org.eclipse.jgit.lib.Repository; |
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import org.eclipse.jgit.transport.NonceGenerator; |
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import org.eclipse.jgit.transport.PushCertificate.NonceStatus; |
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|
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/** |
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* The nonce generator which was first introduced to git-core. |
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*/ |
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public class HMACSHA1NonceGenerator implements NonceGenerator { |
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|
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private Mac mac; |
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|
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/** |
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* @param seed |
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* @throws IllegalStateException |
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*/ |
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public HMACSHA1NonceGenerator(String seed) throws IllegalStateException { |
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try { |
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byte[] keyBytes = seed.getBytes("ISO-8859-1"); //$NON-NLS-1$
|
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SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1"); //$NON-NLS-1$
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mac = Mac.getInstance("HmacSHA1"); //$NON-NLS-1$
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mac.init(signingKey); |
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} catch (InvalidKeyException e) { |
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throw new IllegalStateException(e); |
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} catch (NoSuchAlgorithmException e) { |
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throw new IllegalStateException(e); |
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} catch (UnsupportedEncodingException e) { |
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throw new IllegalStateException(e); |
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} |
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} |
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|
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public synchronized String createNonce(Repository repo, long timestamp) |
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throws IllegalStateException { |
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String path; |
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if (repo instanceof DfsRepository) |
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path = ((DfsRepository) repo).getDescription().getRepositoryName(); |
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else if (repo.getDirectory() != null) |
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path = repo.getDirectory().getPath(); |
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else |
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throw new IllegalStateException(); |
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String input = path + ":" + String.valueOf(timestamp); //$NON-NLS-1$
|
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byte[] rawHmac; |
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try { |
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rawHmac = mac.doFinal(input.getBytes("UTF-8")); //$NON-NLS-1$
|
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} catch (UnsupportedEncodingException e) { |
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throw new IllegalStateException(e); |
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} |
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String sentNonce = String.format( |
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"%d-%20X", new Long(timestamp), rawHmac); //$NON-NLS-1$
|
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return sentNonce; |
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} |
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|
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@Override |
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public NonceStatus verify(String received, String sent, |
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Repository db, boolean allowSlop, int slop) { |
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if (received.isEmpty()) |
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return NonceStatus.MISSING; |
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else if (sent.isEmpty()) |
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return NonceStatus.UNSOLICITED; |
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else if (received.equals(sent)) |
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return NonceStatus.OK; |
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|
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if (!allowSlop) |
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return NonceStatus.BAD; |
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|
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/* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */ |
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int idxSent = sent.indexOf('-'); |
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int idxRecv = received.indexOf('-'); |
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if (idxSent == -1 || idxRecv == -1) |
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return NonceStatus.BAD; |
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|
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long signedStamp; |
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long advertisedStamp; |
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try { |
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signedStamp = Long.parseLong(received.substring(0, idxRecv)); |
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advertisedStamp = Long.parseLong(sent.substring(0, idxSent)); |
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} catch (Exception e) { |
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return NonceStatus.BAD; |
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} |
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// what we would have signed earlier
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String expect = createNonce(db, signedStamp); |
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|
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if (!expect.equals(received)) |
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return NonceStatus.BAD; |
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long nonceStampSlop = Math.abs(advertisedStamp - signedStamp); |
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|
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if (nonceStampSlop <= slop) { |
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return NonceStatus.OK; |
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} else { |
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return NonceStatus.SLOP; |
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} |
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} |
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} |
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@ -0,0 +1,92 @@
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/* |
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* Copyright (C) 2015, Google Inc. |
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* and other copyright owners as documented in the project's IP log. |
||||
* |
||||
* This program and the accompanying materials are made available |
||||
* under the terms of the Eclipse Distribution License v1.0 which |
||||
* accompanies this distribution, is reproduced below, and is |
||||
* available at http://www.eclipse.org/org/documents/edl-v10.php
|
||||
* |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or |
||||
* without modification, are permitted provided that the following |
||||
* conditions are met: |
||||
* |
||||
* - Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* |
||||
* - Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following |
||||
* disclaimer in the documentation and/or other materials provided |
||||
* with the distribution. |
||||
* |
||||
* - Neither the name of the Eclipse Foundation, Inc. nor the |
||||
* names of its contributors may be used to endorse or promote |
||||
* products derived from this software without specific prior |
||||
* written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
||||
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
||||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
||||
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
||||
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
*/ |
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package org.eclipse.jgit.transport; |
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|
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import org.eclipse.jgit.lib.Repository; |
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import org.eclipse.jgit.transport.PushCertificate.NonceStatus; |
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|
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/** |
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* A NonceGenerator is used to create a nonce to be sent out to the pusher who |
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* will sign the nonce to prove it is not a replay attack on the push |
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* certificate. |
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*/ |
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public interface NonceGenerator { |
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|
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/** |
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* @param db |
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* The repository which should be used to obtain a unique String |
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* such that the pusher cannot forge nonces by pushing to another |
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* repository at the same time as well and reusing the nonce. |
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* @param timestamp |
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* The current time in seconds. |
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* @return The nonce to be signed by the pusher |
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* @throws IllegalStateException |
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*/ |
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public String createNonce(Repository db, long timestamp) |
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throws IllegalStateException; |
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|
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/** |
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* @param received |
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* The nonce which was received from the server |
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* @param sent |
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* The nonce which was originally sent out to the client. |
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* @param db |
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* The repository which should be used to obtain a unique String |
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* such that the pusher cannot forge nonces by pushing to another |
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* repository at the same time as well and reusing the nonce. |
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* |
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* @param allowSlop |
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* If the receiving backend is is able to generate slop. This is |
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* the case for serving via http protocol using more than one |
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* http frontend. The client would talk to different http |
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* frontends, which may have a slight difference of time due to |
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* @param slop |
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* If `allowSlop` is true, this specifies the number of seconds |
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* which we allow as slop. |
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* |
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* @return a NonceStatus indicating the trustworthiness of the received |
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* nonce. |
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*/ |
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public NonceStatus verify(String received, String sent, |
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Repository db, boolean allowSlop, int slop); |
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} |
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@ -0,0 +1,135 @@
|
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/* |
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* Copyright (C) 2015, Google Inc. |
||||
* and other copyright owners as documented in the project's IP log. |
||||
* |
||||
* This program and the accompanying materials are made available |
||||
* under the terms of the Eclipse Distribution License v1.0 which |
||||
* accompanies this distribution, is reproduced below, and is |
||||
* available at http://www.eclipse.org/org/documents/edl-v10.php
|
||||
* |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or |
||||
* without modification, are permitted provided that the following |
||||
* conditions are met: |
||||
* |
||||
* - Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* |
||||
* - Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following |
||||
* disclaimer in the documentation and/or other materials provided |
||||
* with the distribution. |
||||
* |
||||
* - Neither the name of the Eclipse Foundation, Inc. nor the |
||||
* names of its contributors may be used to endorse or promote |
||||
* products derived from this software without specific prior |
||||
* written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
||||
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
||||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
||||
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
||||
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
*/ |
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|
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package org.eclipse.jgit.transport; |
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|
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/** |
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* The required information to verify the push. |
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*/ |
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public class PushCertificate { |
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|
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/** The tuple "name <email>" as presented in the push certificate */ |
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String pusher; |
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|
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/** The remote URL the signed push goes to */ |
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String pushee; |
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|
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/** What we think about the returned signed nonce */ |
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NonceStatus nonceStatus; |
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|
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/** |
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* |
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* |
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*/ |
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public enum NonceStatus { |
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/** |
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* |
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*/ |
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UNSOLICITED, |
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/** |
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* |
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*/ |
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BAD, |
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/** |
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* |
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*/ |
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MISSING, |
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/** |
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* |
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*/ |
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OK, |
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/** |
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* |
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*/ |
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SLOP |
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} |
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|
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/** |
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* |
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*/ |
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String commandList; |
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|
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/** |
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* |
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*/ |
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String signature; |
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|
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/** |
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* |
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* @return the signature, consisting of the lines received between the lines |
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* '----BEGIN GPG SIGNATURE-----\n' and the '----END GPG |
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* SIGNATURE-----\n' |
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*/ |
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public String getSignature() { |
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return signature; |
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} |
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|
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/** |
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* @return the list of commands as one string to be feed into the signature |
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* verifier. |
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*/ |
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public String getCommandList() { |
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return commandList; |
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} |
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|
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/** |
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* @return the pushedCertPusher |
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*/ |
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public String getPusher() { |
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return pusher; |
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} |
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|
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/** |
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* @return the pushedCertPushee |
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*/ |
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public String getPushee() { |
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return pushee; |
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} |
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|
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/** |
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* @return the pushCertNonceStatus |
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*/ |
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public NonceStatus getNonceStatus() { |
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return nonceStatus; |
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} |
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} |
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@ -0,0 +1,202 @@
|
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/* |
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* Copyright (C) 2015, Google Inc. |
||||
* and other copyright owners as documented in the project's IP log. |
||||
* |
||||
* This program and the accompanying materials are made available |
||||
* under the terms of the Eclipse Distribution License v1.0 which |
||||
* accompanies this distribution, is reproduced below, and is |
||||
* available at http://www.eclipse.org/org/documents/edl-v10.php
|
||||
* |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or |
||||
* without modification, are permitted provided that the following |
||||
* conditions are met: |
||||
* |
||||
* - Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* |
||||
* - Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following |
||||
* disclaimer in the documentation and/or other materials provided |
||||
* with the distribution. |
||||
* |
||||
* - Neither the name of the Eclipse Foundation, Inc. nor the |
||||
* names of its contributors may be used to endorse or promote |
||||
* products derived from this software without specific prior |
||||
* written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
||||
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
||||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
||||
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
||||
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
*/ |
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package org.eclipse.jgit.transport; |
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|
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import static org.eclipse.jgit.transport.GitProtocolConstants.CAPABILITY_PUSH_CERT; |
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|
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import java.io.EOFException; |
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import java.io.IOException; |
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import java.text.MessageFormat; |
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import java.util.concurrent.TimeUnit; |
||||
|
||||
import org.eclipse.jgit.internal.JGitText; |
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import org.eclipse.jgit.lib.Repository; |
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import org.eclipse.jgit.transport.BaseReceivePack.ReceiveConfig; |
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|
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/** |
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* @author sbeller |
||||
* |
||||
*/ |
||||
public class PushCertificateParser extends PushCertificate { |
||||
|
||||
private static final String VERSION = "version "; //$NON-NLS-1$
|
||||
|
||||
private static final String PUSHER = "pusher"; //$NON-NLS-1$
|
||||
|
||||
private static final String PUSHEE = "pushee"; //$NON-NLS-1$
|
||||
|
||||
private static final String NONCE = "nonce"; //$NON-NLS-1$
|
||||
|
||||
/** The individual certificate which is presented to the client */ |
||||
private String sentNonce; |
||||
|
||||
/** |
||||
* The nonce the pusher signed. This may vary from pushCertNonce See |
||||
* git-core documentation for reasons. |
||||
*/ |
||||
private String receivedNonce; |
||||
|
||||
/** |
||||
* The maximum time difference which is acceptable between advertised nonce |
||||
* and received signed nonce. |
||||
*/ |
||||
private int nonceSlopLimit; |
||||
|
||||
NonceGenerator nonceGenerator; |
||||
|
||||
/** |
||||
* used to build up commandlist |
||||
*/ |
||||
StringBuilder commandlistBuilder; |
||||
|
||||
/** Database we write the push certificate into. */ |
||||
private Repository db; |
||||
|
||||
PushCertificateParser(Repository into, ReceiveConfig cfg) { |
||||
nonceSlopLimit = cfg.certNonceSlopLimit; |
||||
nonceGenerator = cfg.certNonceSeed != null |
||||
? new HMACSHA1NonceGenerator(cfg.certNonceSeed) |
||||
: null; |
||||
db = into; |
||||
} |
||||
|
||||
/** |
||||
* @return if the server is configured to use signed pushes. |
||||
*/ |
||||
public boolean enabled() { |
||||
return nonceGenerator != null; |
||||
} |
||||
|
||||
/** |
||||
* @return the whole string for the nonce to be included into the capability |
||||
* advertisement. |
||||
*/ |
||||
public String getAdvertiseNonce() { |
||||
sentNonce = nonceGenerator.createNonce(db, |
||||
TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())); |
||||
return CAPABILITY_PUSH_CERT + "=" + sentNonce; //$NON-NLS-1$
|
||||
} |
||||
|
||||
private String parseNextLine(PacketLineIn pckIn, String startingWith) |
||||
throws IOException { |
||||
String s = pckIn.readString(); |
||||
if (!s.startsWith(startingWith)) |
||||
throw new IOException(MessageFormat.format( |
||||
JGitText.get().errorInvalidPushCert, |
||||
"expected " + startingWith)); //$NON-NLS-1$
|
||||
return s.substring(startingWith.length()); |
||||
} |
||||
|
||||
/** |
||||
* Receive a list of commands from the input encapsulated in a push |
||||
* certificate. This method doesn't deal with the first line "push-cert \NUL |
||||
* <capabilities>", but assumes the first line including the capabilities |
||||
* has already been dealt with. |
||||
* |
||||
* @param pckIn |
||||
* where we take the push certificate header from. |
||||
* @param stateless |
||||
* If this server is run as a stateless server, such that it |
||||
* cannot store the sent push certificate and needs to validate |
||||
* what the client sends back. |
||||
* |
||||
* @throws IOException |
||||
*/ |
||||
public void receiveHeader(PacketLineIn pckIn, boolean stateless) |
||||
throws IOException { |
||||
try { |
||||
String version = parseNextLine(pckIn, VERSION); |
||||
if (!version.equals("0.1")) { //$NON-NLS-1$
|
||||
throw new IOException(MessageFormat.format( |
||||
JGitText.get().errorInvalidPushCert, |
||||
"version not supported")); //$NON-NLS-1$
|
||||
} |
||||
pusher = parseNextLine(pckIn, PUSHER); |
||||
pushee = parseNextLine(pckIn, PUSHEE); |
||||
receivedNonce = parseNextLine(pckIn, NONCE); |
||||
// an empty line
|
||||
if (pckIn.readString() != "") { //$NON-NLS-1$
|
||||
throw new IOException(MessageFormat.format( |
||||
JGitText.get().errorInvalidPushCert, |
||||
"expected empty line after header")); //$NON-NLS-1$
|
||||
} |
||||
} catch (EOFException eof) { |
||||
throw new IOException(MessageFormat.format( |
||||
JGitText.get().errorInvalidPushCert, |
||||
"broken push certificate header")); //$NON-NLS-1$
|
||||
} |
||||
nonceStatus = nonceGenerator.verify(receivedNonce, sentNonce, db, |
||||
stateless, nonceSlopLimit); |
||||
} |
||||
|
||||
/** |
||||
* Reads the gpg signature. This method assumes the line "-----BEGIN PGP |
||||
* SIGNATURE-----\n" has already been parsed and continues parsing until an |
||||
* "-----END PGP SIGNATURE-----\n" is found. |
||||
* |
||||
* @param pckIn |
||||
* where we read the signature from. |
||||
* @throws IOException |
||||
*/ |
||||
public void receiveSignature(PacketLineIn pckIn) throws IOException { |
||||
try { |
||||
StringBuilder sig = new StringBuilder(); |
||||
String line = pckIn.readStringRaw(); |
||||
while (!line.equals("-----END PGP SIGNATURE-----\n")) //$NON-NLS-1$
|
||||
sig.append(line); |
||||
signature = sig.toString(); |
||||
commandList = commandlistBuilder.toString(); |
||||
} catch (EOFException eof) { |
||||
throw new IOException(MessageFormat.format( |
||||
JGitText.get().errorInvalidPushCert, |
||||
"broken push certificate signature")); //$NON-NLS-1$
|
||||
} |
||||
} |
||||
|
||||
/** |
||||
* @param rawLine |
||||
*/ |
||||
public void addCommand(String rawLine) { |
||||
commandlistBuilder.append(rawLine); |
||||
} |
||||
} |
||||
Loading…
Reference in new issue