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authorShawn Pearce <spearce@spearce.org>2016-07-05 13:05:04 -0700
committerShawn Pearce <spearce@spearce.org>2016-07-05 17:22:37 -0700
commit63cf87f8630e1176008f308742d7a72f5c7ec123 (patch)
tree3d525f304892d3f15e95385c030a212dae3a5b10
parenta1bedf08228350733a6dd9c2c8c0c9053efbbcec (diff)
downloadjgit-63cf87f8630e1176008f308742d7a72f5c7ec123.tar.gz
jgit-63cf87f8630e1176008f308742d7a72f5c7ec123.zip
ReceivePack: report protocol parsing failures on channel 3
If the client sent a well-formed enough request to see it wants to use side-band-64k for status reporting (meaning its a modern client), but any other command record was somehow invalid (e.g. corrupt SHA-1) report the parsing exception using channel 3. This allows clients to see the failure and know the server will not be continuing. git-core and JGit clients send all commands and then start a sideband demux before sending the pack. By consuming all commands first we get the client into a state where it can see and respond to the channel 3 server failure. This behavior is useful on HTTPS connections when the client is buggy and sent a corrupt command, but still managed to request side-band-64k in the first line. Change-Id: If385b91ceb9f024ccae2d1645caf15bc6b206130
-rw-r--r--org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PushConnectionTest.java40
-rw-r--r--org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java25
-rw-r--r--org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java10
3 files changed, 74 insertions, 1 deletions
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PushConnectionTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PushConnectionTest.java
index 9e78921b79..33a910505f 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PushConnectionTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PushConnectionTest.java
@@ -43,13 +43,18 @@
package org.eclipse.jgit.transport;
+import static org.eclipse.jgit.transport.BasePackPushConnection.CAPABILITY_REPORT_STATUS;
+import static org.eclipse.jgit.transport.BasePackPushConnection.CAPABILITY_SIDE_BAND_64K;
import static org.eclipse.jgit.transport.RemoteRefUpdate.Status.REJECTED_OTHER_REASON;
import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
import java.io.IOException;
+import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
+import org.eclipse.jgit.errors.TransportException;
import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
import org.eclipse.jgit.lib.Constants;
@@ -133,4 +138,39 @@ public class PushConnectionTest {
assertEquals(REJECTED_OTHER_REASON, rru.getStatus());
assertEquals("invalid old id sent", rru.getMessage());
}
+
+ @Test
+ public void invalidCommand() throws IOException {
+ try (Transport tn = testProtocol.open(uri, client, "server");
+ InternalPushConnection c = (InternalPushConnection) tn.openPush()) {
+ StringWriter msgs = new StringWriter();
+ PacketLineOut pckOut = c.pckOut;
+
+ @SuppressWarnings("resource")
+ SideBandInputStream in = new SideBandInputStream(c.in,
+ NullProgressMonitor.INSTANCE, msgs, null);
+
+ // Explicitly invalid command, but sane enough capabilities.
+ StringBuilder buf = new StringBuilder();
+ buf.append("42");
+ buf.append(' ');
+ buf.append(obj2.name());
+ buf.append(' ');
+ buf.append("refs/heads/A" + obj2.name());
+ buf.append('\0').append(CAPABILITY_SIDE_BAND_64K);
+ buf.append(' ').append(CAPABILITY_REPORT_STATUS);
+ buf.append('\n');
+ pckOut.writeString(buf.toString());
+ pckOut.end();
+
+ try {
+ in.read();
+ fail("expected TransportException");
+ } catch (TransportException e) {
+ assertEquals(
+ "remote: error: invalid protocol: wanted 'old new ref'",
+ e.getMessage());
+ }
+ }
+ }
}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java
index f4eef5f48e..aae4bd9c3c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java
@@ -51,6 +51,7 @@ import static org.eclipse.jgit.transport.GitProtocolConstants.CAPABILITY_REPORT_
import static org.eclipse.jgit.transport.GitProtocolConstants.CAPABILITY_SIDE_BAND_64K;
import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_AGENT;
import static org.eclipse.jgit.transport.SideBandOutputStream.CH_DATA;
+import static org.eclipse.jgit.transport.SideBandOutputStream.CH_ERROR;
import static org.eclipse.jgit.transport.SideBandOutputStream.CH_PROGRESS;
import static org.eclipse.jgit.transport.SideBandOutputStream.MAX_BUF;
@@ -215,6 +216,7 @@ public abstract class BaseReceivePack {
/** Optional message output stream. */
protected OutputStream msgOut;
+ private SideBandOutputStream errOut;
/** Packet line input stream around {@link #rawIn}. */
protected PacketLineIn pckIn;
@@ -879,6 +881,19 @@ public abstract class BaseReceivePack {
}
}
+ private void fatalError(String msg) {
+ if (errOut != null) {
+ try {
+ errOut.write(Constants.encode(msg));
+ errOut.flush();
+ } catch (IOException e) {
+ // Ignore write failures
+ }
+ } else {
+ sendError(msg);
+ }
+ }
+
/**
* Send a message to the client, if it supports receiving them.
* <p>
@@ -1128,7 +1143,14 @@ public abstract class BaseReceivePack {
}
pushCert = certParser.build();
} catch (PackProtocolException e) {
- sendError(e.getMessage());
+ if (sideBand) {
+ try {
+ pckIn.discardUntilEnd();
+ } catch (IOException e2) {
+ // Ignore read failures attempting to discard.
+ }
+ }
+ fatalError(e.getMessage());
throw e;
}
}
@@ -1175,6 +1197,7 @@ public abstract class BaseReceivePack {
rawOut = new SideBandOutputStream(CH_DATA, MAX_BUF, out);
msgOut = new SideBandOutputStream(CH_PROGRESS, MAX_BUF, out);
+ errOut = new SideBandOutputStream(CH_ERROR, MAX_BUF, out);
pckOut = new PacketLineOut(rawOut);
pckOut.setFlushOnEnd(false);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java
index e1769f84ed..8d291b8517 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java
@@ -182,6 +182,16 @@ public class PacketLineIn {
return RawParseUtils.decode(Constants.CHARSET, raw, 0, len);
}
+ void discardUntilEnd() throws IOException {
+ for (;;) {
+ int n = readLength();
+ if (n == 0) {
+ break;
+ }
+ IO.skipFully(in, n - 4);
+ }
+ }
+
int readLength() throws IOException {
IO.readFully(in, lineBuffer, 0, 4);
try {