Hi,
I'm using JSch 0.1.45 to connect to a remote machine running Debian
GNU/Linux with OpenSSH (OpenSSH_5.5p1 Debian-6+squeeze1, OpenSSL 0.9.8o
01 Jun 2010).
I enable agent forwarding by calling channel.setAgentForwarding(true)
and connected to the remote side by public key. So far, everything works
as expected.
But when I execute "ssh-add -l" on the remote side, JSch runs through
ChannelAgentForwarding#write with typ = 1
(SSH_AGENTC_REQUEST_RSA_IDENTITIES) and produces no output. That causes
ssh-add to freeze and it must be killed manually.
Since forwarding the key works when I execute "ssh remotehost2" this is
not a very big problem, but it would be nice to get a proper output from
ssh-add.
I tried a little hack to answer the SSH_AGENTC_REQUEST_RSA_IDENTITIES
request with 0 keys. The next request is SSH2_AGENTC_REQUEST_IDENTITIES
and this one is processed correctly. The patch is included. This enables
ssh-add to list all known keys.
I don't know if you plan to support more key-agent features, but it
would be relly nice :-)
Sincerely,
Jochen
diff --git a/src/com/jcraft/jsch/ChannelAgentForwarding.java
b/src/com/jcraft/jsch/ChannelAgentForwarding.java
index 9fb8cb0..745fbda 100644
--- a/src/com/jcraft/jsch/ChannelAgentForwarding.java
+++ b/src/com/jcraft/jsch/ChannelAgentForwarding.java
@@ -37,6 +37,9 @@ class ChannelAgentForwarding extends Channel{
static private final int LOCAL_WINDOW_SIZE_MAX=0x20000;
static private final int LOCAL_MAXIMUM_PACKET_SIZE=0x4000;
+ private final int SSH_AGENTC_REQUEST_RSA_IDENTITIES = 1;
+ private final int SSH_AGENT_RSA_IDENTITIES_ANSWER = 2;
+
private final int SSH2_AGENTC_REQUEST_IDENTITIES=11;
private final int SSH2_AGENT_IDENTITIES_ANSWER=12;
private final int SSH2_AGENTC_SIGN_REQUEST=13;
@@ -114,7 +117,16 @@ class ChannelAgentForwarding extends Channel{
Vector identities=_session.jsch.identities;
UserInfo userinfo=_session.getUserInfo();
- if(typ==SSH2_AGENTC_REQUEST_IDENTITIES){
+ if(typ == SSH_AGENTC_REQUEST_RSA_IDENTITIES) {
+ mbuf.reset();
+ mbuf.putByte((byte) SSH_AGENT_RSA_IDENTITIES_ANSWER);
+ mbuf.putInt(0);
+ byte[] bar=new byte[mbuf.getLength()];
+ mbuf.getByte(bar);
+
+ send(bar);
+ }
+ else if(typ==SSH2_AGENTC_REQUEST_IDENTITIES){
mbuf.reset();
mbuf.putByte((byte)SSH2_AGENT_IDENTITIES_ANSWER);
synchronized(identities){
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