Ramanjaneyulu Mallisetty created SSHD-1342:
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Summary: Receiving error like Bad signature length (64 instead of
40)
Key: SSHD-1342
URL: https://issues.apache.org/jira/browse/SSHD-1342
Project: MINA SSHD
Issue Type: Question
Affects Versions: 2.8.0
Reporter: Ramanjaneyulu Mallisetty
Hi,
I have an application connecting to multiple SFTP servers and my client
code looks like below. It works for many SFTP server but getting exception like
below for few servers.
WARNING: exceptionCaught(ClientSessionImpl[xxxxxxxx])[state=Opened]
SignatureException: Bad signature length (64 instead of 40) for
56:54:55:20:42:e6:8c:7d:19:d0:01:2f:6a:10:af:1a:ed:c3:68:45:5e:0e:89:44:3f:f1:d5:55:c2:4c:ab:a7:03:1f:7f:7d:74:a1:99:75:20:4a:ff:c4:f8:a9:09:b8:cd:aa:8e:cf:b0:4a:b6:46:e7:92:61:f2:cb:ed:40:a8
Jun 16, 2024 6:57:50 PM sftp.samples.MinaSSHClient sftp
SEVERE: DefaultAuthFuture[ssh-connection]: Failed (SignatureException) to
execute: Bad signature length (64 instead of 40) for
56:54:55:20:42:e6:8c:7d:19:d0:01:2f:6a:10:af:1a:ed:c3:68:45:5e:0e:89:44:3f:f1:d5:55:c2:4c:ab:a7:03:1f:7f:7d:74:a1:99:75:20:4a:ff:c4:f8:a9:09:b8:cd:aa:8e:cf:b0:4a:b6:46:e7:92:61:f2:cb:ed:40:a8
org.apache.sshd.common.SshException: DefaultAuthFuture[ssh-connection]: Failed
(SignatureException) to execute: Bad signature length (64 instead of 40) for
56:54:55:20:42:e6:8c:7d:19:d0:01:2f:6a:10:af:1a:ed:c3:68:45:5e:0e:89:44:3f:f1:d5:55:c2:4c:ab:a7:03:1f:7f:7d:74:a1:99:75:20:4a:ff:c4:f8:a9:09:b8:cd:aa:8e:cf:b0:4a:b6:46:e7:92:61:f2:cb:ed:40:a8
at
org.apache.sshd.common.future.AbstractSshFuture.lambda$verifyResult$1(AbstractSshFuture.java:131)
at
org.apache.sshd.common.future.AbstractSshFuture.formatExceptionMessage(AbstractSshFuture.java:185)
at
org.apache.sshd.common.future.AbstractSshFuture.verifyResult(AbstractSshFuture.java:130)
at
org.apache.sshd.client.future.DefaultAuthFuture.verify(DefaultAuthFuture.java:39)
at
org.apache.sshd.client.future.DefaultAuthFuture.verify(DefaultAuthFuture.java:32)
at sftp.samples.MinaSSHClient.getClientSession(MinaSSHClient.java:133)
Negotiated kex algorithms: diffie-hellman-group-exchange-sha256
Negotiated host key algorithm : ssh-dss
Server proposal kex algorithms:
diffie-hellman-group14-sha1,diffie-hellman-group14-sha256,diffie-hellman-group-exchange-sha256
Client proposal kex algorithms:
curve448-sha512,[email protected],curve25519-sha256,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group18-sha512,diffie-hellman-group17-sha512,diffie-hellman-group16-sha512,diffie-hellman-group15-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,ext-info-c
private synchronized static SshClient getSshClient() {
if (sshClient == null) {
sshClient = SshClient.setUpDefaultClient();
List<KeyExchangeFactory> setUpTransformedFactories =
NamedFactory.setUpTransformedFactories(true, BuiltinDHFactories.VALUES,
ClientBuilder.DH2KEX);
List<KeyExchangeFactory> newKexList = new ArrayList<>();
Collections.reverse(setUpTransformedFactories);
sshClient.setKeyExchangeFactories(setUpTransformedFactories);
sshClient.setSignatureFactories(new
ArrayList<>(BuiltinSignatures.VALUES));
SftpModuleProperties.CHUNK_IF_WINDOW_LESS_THAN_PACKET.set(sshClient, true);
ServerKeyVerifier serverKeyVerifier =
AcceptAllServerKeyVerifier.INSTANCE;
sshClient.setServerKeyVerifier(serverKeyVerifier);
sshClient.start();
}
return sshClient;
}
private static ClientSession getClientSession(String sftpHost, String sftpPort,
String sftpUser,
String sftpPassword) throws Exception {
SshClient client = getSshClient();
ClientSession session = client.connect(sftpUser, sftpHost,
Integer.parseInt(sftpPort)).verify(10000)
.getSession();
session.addPasswordIdentity(sftpPassword);
AuthFuture verify = session.auth().verify(10000);
verify.addListener(new SshFutureListener<AuthFuture>() {
@Override
public void operationComplete(AuthFuture future) {
logger.error(future.getException().getMessage(), future.getException());
}
});
return session;
}
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